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
36 * lksctp developers <linux-sctp@vger.kernel.org>
38 * Written or modified by:
39 * La Monte H.P. Yarroll <piggy@acm.org>
40 * Narasimha Budihal <narsi@refcode.org>
41 * Karl Knutson <karl@athena.chicago.il.us>
42 * Jon Grimm <jgrimm@us.ibm.com>
43 * Xingang Guo <xingang.guo@intel.com>
44 * Daisy Chang <daisyc@us.ibm.com>
45 * Sridhar Samudrala <samudrala@us.ibm.com>
46 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
47 * Ardelle Fan <ardelle.fan@intel.com>
48 * Ryan Layer <rmlayer@us.ibm.com>
49 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
50 * Kevin Gao <kevin.gao@intel.com>
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 void 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 = vmemdup_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 = vmemdup_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);
1876 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1877 struct msghdr *msg, size_t msg_len,
1878 struct sctp_transport *transport,
1879 struct sctp_sndrcvinfo *sinfo)
1881 struct sock *sk = asoc->base.sk;
1882 struct sctp_sock *sp = sctp_sk(sk);
1883 struct net *net = sock_net(sk);
1884 struct sctp_datamsg *datamsg;
1885 bool wait_connect = false;
1886 struct sctp_chunk *chunk;
1890 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1895 if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1896 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1901 if (sp->disable_fragments && msg_len > asoc->frag_point) {
1906 if (asoc->pmtu_pending) {
1907 if (sp->param_flags & SPP_PMTUD_ENABLE)
1908 sctp_assoc_sync_pmtu(asoc);
1909 asoc->pmtu_pending = 0;
1912 if (sctp_wspace(asoc) < (int)msg_len)
1913 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1915 if (sctp_wspace(asoc) <= 0) {
1916 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1917 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1922 if (sctp_state(asoc, CLOSED)) {
1923 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1927 if (sp->strm_interleave) {
1928 timeo = sock_sndtimeo(sk, 0);
1929 err = sctp_wait_for_connect(asoc, &timeo);
1935 wait_connect = true;
1938 pr_debug("%s: we associated primitively\n", __func__);
1941 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1942 if (IS_ERR(datamsg)) {
1943 err = PTR_ERR(datamsg);
1947 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1949 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1950 sctp_chunk_hold(chunk);
1951 sctp_set_owner_w(chunk);
1952 chunk->transport = transport;
1955 err = sctp_primitive_SEND(net, asoc, datamsg);
1957 sctp_datamsg_free(datamsg);
1961 pr_debug("%s: we sent primitively\n", __func__);
1963 sctp_datamsg_put(datamsg);
1965 if (unlikely(wait_connect)) {
1966 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1967 sctp_wait_for_connect(asoc, &timeo);
1976 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1977 const struct msghdr *msg,
1978 struct sctp_cmsgs *cmsgs)
1980 union sctp_addr *daddr = NULL;
1983 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1984 int len = msg->msg_namelen;
1986 if (len > sizeof(*daddr))
1987 len = sizeof(*daddr);
1989 daddr = (union sctp_addr *)msg->msg_name;
1991 err = sctp_verify_addr(sk, daddr, len);
1993 return ERR_PTR(err);
1999 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
2000 struct sctp_sndrcvinfo *sinfo,
2001 struct sctp_cmsgs *cmsgs)
2003 if (!cmsgs->srinfo && !cmsgs->sinfo) {
2004 sinfo->sinfo_stream = asoc->default_stream;
2005 sinfo->sinfo_ppid = asoc->default_ppid;
2006 sinfo->sinfo_context = asoc->default_context;
2007 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
2010 sinfo->sinfo_flags = asoc->default_flags;
2013 if (!cmsgs->srinfo && !cmsgs->prinfo)
2014 sinfo->sinfo_timetolive = asoc->default_timetolive;
2016 if (cmsgs->authinfo) {
2017 /* Reuse sinfo_tsn to indicate that authinfo was set and
2018 * sinfo_ssn to save the keyid on tx path.
2020 sinfo->sinfo_tsn = 1;
2021 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
2025 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
2027 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
2028 struct sctp_transport *transport = NULL;
2029 struct sctp_sndrcvinfo _sinfo, *sinfo;
2030 struct sctp_association *asoc;
2031 struct sctp_cmsgs cmsgs;
2032 union sctp_addr *daddr;
2037 /* Parse and get snd_info */
2038 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
2043 sflags = sinfo->sinfo_flags;
2045 /* Get daddr from msg */
2046 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
2047 if (IS_ERR(daddr)) {
2048 err = PTR_ERR(daddr);
2054 /* SCTP_SENDALL process */
2055 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
2056 list_for_each_entry(asoc, &ep->asocs, asocs) {
2057 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2064 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2066 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
2071 iov_iter_revert(&msg->msg_iter, err);
2077 /* Get and check or create asoc */
2079 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
2081 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2086 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
2091 asoc = transport->asoc;
2095 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2098 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2104 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2109 /* Update snd_info with the asoc */
2110 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2112 /* Send msg to the asoc */
2113 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2114 if (err < 0 && err != -ESRCH && new)
2115 sctp_association_free(asoc);
2120 return sctp_error(sk, msg->msg_flags, err);
2123 /* This is an extended version of skb_pull() that removes the data from the
2124 * start of a skb even when data is spread across the list of skb's in the
2125 * frag_list. len specifies the total amount of data that needs to be removed.
2126 * when 'len' bytes could be removed from the skb, it returns 0.
2127 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2128 * could not be removed.
2130 static int sctp_skb_pull(struct sk_buff *skb, int len)
2132 struct sk_buff *list;
2133 int skb_len = skb_headlen(skb);
2136 if (len <= skb_len) {
2137 __skb_pull(skb, len);
2141 __skb_pull(skb, skb_len);
2143 skb_walk_frags(skb, list) {
2144 rlen = sctp_skb_pull(list, len);
2145 skb->len -= (len-rlen);
2146 skb->data_len -= (len-rlen);
2157 /* API 3.1.3 recvmsg() - UDP Style Syntax
2159 * ssize_t recvmsg(int socket, struct msghdr *message,
2162 * socket - the socket descriptor of the endpoint.
2163 * message - pointer to the msghdr structure which contains a single
2164 * user message and possibly some ancillary data.
2166 * See Section 5 for complete description of the data
2169 * flags - flags sent or received with the user message, see Section
2170 * 5 for complete description of the flags.
2172 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2173 int noblock, int flags, int *addr_len)
2175 struct sctp_ulpevent *event = NULL;
2176 struct sctp_sock *sp = sctp_sk(sk);
2177 struct sk_buff *skb, *head_skb;
2182 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2183 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2188 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2189 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2194 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2198 /* Get the total length of the skb including any skb's in the
2207 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2209 event = sctp_skb2event(skb);
2214 if (event->chunk && event->chunk->head_skb)
2215 head_skb = event->chunk->head_skb;
2218 sock_recv_ts_and_drops(msg, sk, head_skb);
2219 if (sctp_ulpevent_is_notification(event)) {
2220 msg->msg_flags |= MSG_NOTIFICATION;
2221 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2223 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2226 /* Check if we allow SCTP_NXTINFO. */
2227 if (sp->recvnxtinfo)
2228 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2229 /* Check if we allow SCTP_RCVINFO. */
2230 if (sp->recvrcvinfo)
2231 sctp_ulpevent_read_rcvinfo(event, msg);
2232 /* Check if we allow SCTP_SNDRCVINFO. */
2233 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2234 sctp_ulpevent_read_sndrcvinfo(event, msg);
2238 /* If skb's length exceeds the user's buffer, update the skb and
2239 * push it back to the receive_queue so that the next call to
2240 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2242 if (skb_len > copied) {
2243 msg->msg_flags &= ~MSG_EOR;
2244 if (flags & MSG_PEEK)
2246 sctp_skb_pull(skb, copied);
2247 skb_queue_head(&sk->sk_receive_queue, skb);
2249 /* When only partial message is copied to the user, increase
2250 * rwnd by that amount. If all the data in the skb is read,
2251 * rwnd is updated when the event is freed.
2253 if (!sctp_ulpevent_is_notification(event))
2254 sctp_assoc_rwnd_increase(event->asoc, copied);
2256 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2257 (event->msg_flags & MSG_EOR))
2258 msg->msg_flags |= MSG_EOR;
2260 msg->msg_flags &= ~MSG_EOR;
2263 if (flags & MSG_PEEK) {
2264 /* Release the skb reference acquired after peeking the skb in
2265 * sctp_skb_recv_datagram().
2269 /* Free the event which includes releasing the reference to
2270 * the owner of the skb, freeing the skb and updating the
2273 sctp_ulpevent_free(event);
2280 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2282 * This option is a on/off flag. If enabled no SCTP message
2283 * fragmentation will be performed. Instead if a message being sent
2284 * exceeds the current PMTU size, the message will NOT be sent and
2285 * instead a error will be indicated to the user.
2287 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2288 char __user *optval,
2289 unsigned int optlen)
2293 if (optlen < sizeof(int))
2296 if (get_user(val, (int __user *)optval))
2299 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2304 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2305 unsigned int optlen)
2307 struct sctp_event_subscribe subscribe;
2308 __u8 *sn_type = (__u8 *)&subscribe;
2309 struct sctp_sock *sp = sctp_sk(sk);
2310 struct sctp_association *asoc;
2313 if (optlen > sizeof(struct sctp_event_subscribe))
2316 if (copy_from_user(&subscribe, optval, optlen))
2319 for (i = 0; i < optlen; i++)
2320 sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2323 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2324 asoc->subscribe = sctp_sk(sk)->subscribe;
2326 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2327 * if there is no data to be sent or retransmit, the stack will
2328 * immediately send up this notification.
2330 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2331 struct sctp_ulpevent *event;
2333 asoc = sctp_id2assoc(sk, 0);
2334 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2335 event = sctp_ulpevent_make_sender_dry_event(asoc,
2336 GFP_USER | __GFP_NOWARN);
2340 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2347 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2349 * This socket option is applicable to the UDP-style socket only. When
2350 * set it will cause associations that are idle for more than the
2351 * specified number of seconds to automatically close. An association
2352 * being idle is defined an association that has NOT sent or received
2353 * user data. The special value of '0' indicates that no automatic
2354 * close of any associations should be performed. The option expects an
2355 * integer defining the number of seconds of idle time before an
2356 * association is closed.
2358 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2359 unsigned int optlen)
2361 struct sctp_sock *sp = sctp_sk(sk);
2362 struct net *net = sock_net(sk);
2364 /* Applicable to UDP-style socket only */
2365 if (sctp_style(sk, TCP))
2367 if (optlen != sizeof(int))
2369 if (copy_from_user(&sp->autoclose, optval, optlen))
2372 if (sp->autoclose > net->sctp.max_autoclose)
2373 sp->autoclose = net->sctp.max_autoclose;
2378 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2380 * Applications can enable or disable heartbeats for any peer address of
2381 * an association, modify an address's heartbeat interval, force a
2382 * heartbeat to be sent immediately, and adjust the address's maximum
2383 * number of retransmissions sent before an address is considered
2384 * unreachable. The following structure is used to access and modify an
2385 * address's parameters:
2387 * struct sctp_paddrparams {
2388 * sctp_assoc_t spp_assoc_id;
2389 * struct sockaddr_storage spp_address;
2390 * uint32_t spp_hbinterval;
2391 * uint16_t spp_pathmaxrxt;
2392 * uint32_t spp_pathmtu;
2393 * uint32_t spp_sackdelay;
2394 * uint32_t spp_flags;
2395 * uint32_t spp_ipv6_flowlabel;
2399 * spp_assoc_id - (one-to-many style socket) This is filled in the
2400 * application, and identifies the association for
2402 * spp_address - This specifies which address is of interest.
2403 * spp_hbinterval - This contains the value of the heartbeat interval,
2404 * in milliseconds. If a value of zero
2405 * is present in this field then no changes are to
2406 * be made to this parameter.
2407 * spp_pathmaxrxt - This contains the maximum number of
2408 * retransmissions before this address shall be
2409 * considered unreachable. If a value of zero
2410 * is present in this field then no changes are to
2411 * be made to this parameter.
2412 * spp_pathmtu - When Path MTU discovery is disabled the value
2413 * specified here will be the "fixed" path mtu.
2414 * Note that if the spp_address field is empty
2415 * then all associations on this address will
2416 * have this fixed path mtu set upon them.
2418 * spp_sackdelay - When delayed sack is enabled, this value specifies
2419 * the number of milliseconds that sacks will be delayed
2420 * for. This value will apply to all addresses of an
2421 * association if the spp_address field is empty. Note
2422 * also, that if delayed sack is enabled and this
2423 * value is set to 0, no change is made to the last
2424 * recorded delayed sack timer value.
2426 * spp_flags - These flags are used to control various features
2427 * on an association. The flag field may contain
2428 * zero or more of the following options.
2430 * SPP_HB_ENABLE - Enable heartbeats on the
2431 * specified address. Note that if the address
2432 * field is empty all addresses for the association
2433 * have heartbeats enabled upon them.
2435 * SPP_HB_DISABLE - Disable heartbeats on the
2436 * speicifed address. Note that if the address
2437 * field is empty all addresses for the association
2438 * will have their heartbeats disabled. Note also
2439 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2440 * mutually exclusive, only one of these two should
2441 * be specified. Enabling both fields will have
2442 * undetermined results.
2444 * SPP_HB_DEMAND - Request a user initiated heartbeat
2445 * to be made immediately.
2447 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2448 * heartbeat delayis to be set to the value of 0
2451 * SPP_PMTUD_ENABLE - This field will enable PMTU
2452 * discovery upon the specified address. Note that
2453 * if the address feild is empty then all addresses
2454 * on the association are effected.
2456 * SPP_PMTUD_DISABLE - This field will disable PMTU
2457 * discovery upon the specified address. Note that
2458 * if the address feild is empty then all addresses
2459 * on the association are effected. Not also that
2460 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2461 * exclusive. Enabling both will have undetermined
2464 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2465 * on delayed sack. The time specified in spp_sackdelay
2466 * is used to specify the sack delay for this address. Note
2467 * that if spp_address is empty then all addresses will
2468 * enable delayed sack and take on the sack delay
2469 * value specified in spp_sackdelay.
2470 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2471 * off delayed sack. If the spp_address field is blank then
2472 * delayed sack is disabled for the entire association. Note
2473 * also that this field is mutually exclusive to
2474 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2477 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
2478 * setting of the IPV6 flow label value. The value is
2479 * contained in the spp_ipv6_flowlabel field.
2480 * Upon retrieval, this flag will be set to indicate that
2481 * the spp_ipv6_flowlabel field has a valid value returned.
2482 * If a specific destination address is set (in the
2483 * spp_address field), then the value returned is that of
2484 * the address. If just an association is specified (and
2485 * no address), then the association's default flow label
2486 * is returned. If neither an association nor a destination
2487 * is specified, then the socket's default flow label is
2488 * returned. For non-IPv6 sockets, this flag will be left
2491 * SPP_DSCP: Setting this flag enables the setting of the
2492 * Differentiated Services Code Point (DSCP) value
2493 * associated with either the association or a specific
2494 * address. The value is obtained in the spp_dscp field.
2495 * Upon retrieval, this flag will be set to indicate that
2496 * the spp_dscp field has a valid value returned. If a
2497 * specific destination address is set when called (in the
2498 * spp_address field), then that specific destination
2499 * address's DSCP value is returned. If just an association
2500 * is specified, then the association's default DSCP is
2501 * returned. If neither an association nor a destination is
2502 * specified, then the socket's default DSCP is returned.
2504 * spp_ipv6_flowlabel
2505 * - This field is used in conjunction with the
2506 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2507 * The 20 least significant bits are used for the flow
2508 * label. This setting has precedence over any IPv6-layer
2511 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2512 * and contains the DSCP. The 6 most significant bits are
2513 * used for the DSCP. This setting has precedence over any
2514 * IPv4- or IPv6- layer setting.
2516 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2517 struct sctp_transport *trans,
2518 struct sctp_association *asoc,
2519 struct sctp_sock *sp,
2522 int sackdelay_change)
2526 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2527 struct net *net = sock_net(trans->asoc->base.sk);
2529 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2534 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2535 * this field is ignored. Note also that a value of zero indicates
2536 * the current setting should be left unchanged.
2538 if (params->spp_flags & SPP_HB_ENABLE) {
2540 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2541 * set. This lets us use 0 value when this flag
2544 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2545 params->spp_hbinterval = 0;
2547 if (params->spp_hbinterval ||
2548 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2551 msecs_to_jiffies(params->spp_hbinterval);
2554 msecs_to_jiffies(params->spp_hbinterval);
2556 sp->hbinterval = params->spp_hbinterval;
2563 trans->param_flags =
2564 (trans->param_flags & ~SPP_HB) | hb_change;
2567 (asoc->param_flags & ~SPP_HB) | hb_change;
2570 (sp->param_flags & ~SPP_HB) | hb_change;
2574 /* When Path MTU discovery is disabled the value specified here will
2575 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2576 * include the flag SPP_PMTUD_DISABLE for this field to have any
2579 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2581 trans->pathmtu = params->spp_pathmtu;
2582 sctp_assoc_sync_pmtu(asoc);
2584 sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2586 sp->pathmtu = params->spp_pathmtu;
2592 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2593 (params->spp_flags & SPP_PMTUD_ENABLE);
2594 trans->param_flags =
2595 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2597 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2598 sctp_assoc_sync_pmtu(asoc);
2602 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2605 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2609 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2610 * value of this field is ignored. Note also that a value of zero
2611 * indicates the current setting should be left unchanged.
2613 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2616 msecs_to_jiffies(params->spp_sackdelay);
2619 msecs_to_jiffies(params->spp_sackdelay);
2621 sp->sackdelay = params->spp_sackdelay;
2625 if (sackdelay_change) {
2627 trans->param_flags =
2628 (trans->param_flags & ~SPP_SACKDELAY) |
2632 (asoc->param_flags & ~SPP_SACKDELAY) |
2636 (sp->param_flags & ~SPP_SACKDELAY) |
2641 /* Note that a value of zero indicates the current setting should be
2644 if (params->spp_pathmaxrxt) {
2646 trans->pathmaxrxt = params->spp_pathmaxrxt;
2648 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2650 sp->pathmaxrxt = params->spp_pathmaxrxt;
2654 if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2656 if (trans->ipaddr.sa.sa_family == AF_INET6) {
2657 trans->flowlabel = params->spp_ipv6_flowlabel &
2658 SCTP_FLOWLABEL_VAL_MASK;
2659 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2662 struct sctp_transport *t;
2664 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2666 if (t->ipaddr.sa.sa_family != AF_INET6)
2668 t->flowlabel = params->spp_ipv6_flowlabel &
2669 SCTP_FLOWLABEL_VAL_MASK;
2670 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2672 asoc->flowlabel = params->spp_ipv6_flowlabel &
2673 SCTP_FLOWLABEL_VAL_MASK;
2674 asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2675 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2676 sp->flowlabel = params->spp_ipv6_flowlabel &
2677 SCTP_FLOWLABEL_VAL_MASK;
2678 sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2682 if (params->spp_flags & SPP_DSCP) {
2684 trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2685 trans->dscp |= SCTP_DSCP_SET_MASK;
2687 struct sctp_transport *t;
2689 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2691 t->dscp = params->spp_dscp &
2693 t->dscp |= SCTP_DSCP_SET_MASK;
2695 asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2696 asoc->dscp |= SCTP_DSCP_SET_MASK;
2698 sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2699 sp->dscp |= SCTP_DSCP_SET_MASK;
2706 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2707 char __user *optval,
2708 unsigned int optlen)
2710 struct sctp_paddrparams params;
2711 struct sctp_transport *trans = NULL;
2712 struct sctp_association *asoc = NULL;
2713 struct sctp_sock *sp = sctp_sk(sk);
2715 int hb_change, pmtud_change, sackdelay_change;
2717 if (optlen == sizeof(params)) {
2718 if (copy_from_user(¶ms, optval, optlen))
2720 } else if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2721 spp_ipv6_flowlabel), 4)) {
2722 if (copy_from_user(¶ms, optval, optlen))
2724 if (params.spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2730 /* Validate flags and value parameters. */
2731 hb_change = params.spp_flags & SPP_HB;
2732 pmtud_change = params.spp_flags & SPP_PMTUD;
2733 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2735 if (hb_change == SPP_HB ||
2736 pmtud_change == SPP_PMTUD ||
2737 sackdelay_change == SPP_SACKDELAY ||
2738 params.spp_sackdelay > 500 ||
2739 (params.spp_pathmtu &&
2740 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2743 /* If an address other than INADDR_ANY is specified, and
2744 * no transport is found, then the request is invalid.
2746 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2747 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2748 params.spp_assoc_id);
2753 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2754 * socket is a one to many style socket, and an association
2755 * was not found, then the id was invalid.
2757 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2758 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
2759 sctp_style(sk, UDP))
2762 /* Heartbeat demand can only be sent on a transport or
2763 * association, but not a socket.
2765 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2768 /* Process parameters. */
2769 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2770 hb_change, pmtud_change,
2776 /* If changes are for association, also apply parameters to each
2779 if (!trans && asoc) {
2780 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2782 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2783 hb_change, pmtud_change,
2791 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2793 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2796 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2798 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2801 static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2802 struct sctp_association *asoc)
2804 struct sctp_transport *trans;
2806 if (params->sack_delay) {
2807 asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2809 sctp_spp_sackdelay_enable(asoc->param_flags);
2811 if (params->sack_freq == 1) {
2813 sctp_spp_sackdelay_disable(asoc->param_flags);
2814 } else if (params->sack_freq > 1) {
2815 asoc->sackfreq = params->sack_freq;
2817 sctp_spp_sackdelay_enable(asoc->param_flags);
2820 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2822 if (params->sack_delay) {
2823 trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2824 trans->param_flags =
2825 sctp_spp_sackdelay_enable(trans->param_flags);
2827 if (params->sack_freq == 1) {
2828 trans->param_flags =
2829 sctp_spp_sackdelay_disable(trans->param_flags);
2830 } else if (params->sack_freq > 1) {
2831 trans->sackfreq = params->sack_freq;
2832 trans->param_flags =
2833 sctp_spp_sackdelay_enable(trans->param_flags);
2839 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2841 * This option will effect the way delayed acks are performed. This
2842 * option allows you to get or set the delayed ack time, in
2843 * milliseconds. It also allows changing the delayed ack frequency.
2844 * Changing the frequency to 1 disables the delayed sack algorithm. If
2845 * the assoc_id is 0, then this sets or gets the endpoints default
2846 * values. If the assoc_id field is non-zero, then the set or get
2847 * effects the specified association for the one to many model (the
2848 * assoc_id field is ignored by the one to one model). Note that if
2849 * sack_delay or sack_freq are 0 when setting this option, then the
2850 * current values will remain unchanged.
2852 * struct sctp_sack_info {
2853 * sctp_assoc_t sack_assoc_id;
2854 * uint32_t sack_delay;
2855 * uint32_t sack_freq;
2858 * sack_assoc_id - This parameter, indicates which association the user
2859 * is performing an action upon. Note that if this field's value is
2860 * zero then the endpoints default value is changed (effecting future
2861 * associations only).
2863 * sack_delay - This parameter contains the number of milliseconds that
2864 * the user is requesting the delayed ACK timer be set to. Note that
2865 * this value is defined in the standard to be between 200 and 500
2868 * sack_freq - This parameter contains the number of packets that must
2869 * be received before a sack is sent without waiting for the delay
2870 * timer to expire. The default value for this is 2, setting this
2871 * value to 1 will disable the delayed sack algorithm.
2874 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2875 char __user *optval, unsigned int optlen)
2877 struct sctp_sock *sp = sctp_sk(sk);
2878 struct sctp_association *asoc;
2879 struct sctp_sack_info params;
2881 if (optlen == sizeof(struct sctp_sack_info)) {
2882 if (copy_from_user(¶ms, optval, optlen))
2885 if (params.sack_delay == 0 && params.sack_freq == 0)
2887 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2888 pr_warn_ratelimited(DEPRECATED
2890 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2891 "Use struct sctp_sack_info instead\n",
2892 current->comm, task_pid_nr(current));
2893 if (copy_from_user(¶ms, optval, optlen))
2896 if (params.sack_delay == 0)
2897 params.sack_freq = 1;
2899 params.sack_freq = 0;
2903 /* Validate value parameter. */
2904 if (params.sack_delay > 500)
2907 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2908 * socket is a one to many style socket, and an association
2909 * was not found, then the id was invalid.
2911 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2912 if (!asoc && params.sack_assoc_id > SCTP_ALL_ASSOC &&
2913 sctp_style(sk, UDP))
2917 sctp_apply_asoc_delayed_ack(¶ms, asoc);
2922 if (params.sack_assoc_id == SCTP_FUTURE_ASSOC ||
2923 params.sack_assoc_id == SCTP_ALL_ASSOC) {
2924 if (params.sack_delay) {
2925 sp->sackdelay = params.sack_delay;
2927 sctp_spp_sackdelay_enable(sp->param_flags);
2929 if (params.sack_freq == 1) {
2931 sctp_spp_sackdelay_disable(sp->param_flags);
2932 } else if (params.sack_freq > 1) {
2933 sp->sackfreq = params.sack_freq;
2935 sctp_spp_sackdelay_enable(sp->param_flags);
2939 if (params.sack_assoc_id == SCTP_CURRENT_ASSOC ||
2940 params.sack_assoc_id == SCTP_ALL_ASSOC)
2941 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2942 sctp_apply_asoc_delayed_ack(¶ms, asoc);
2947 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2949 * Applications can specify protocol parameters for the default association
2950 * initialization. The option name argument to setsockopt() and getsockopt()
2953 * Setting initialization parameters is effective only on an unconnected
2954 * socket (for UDP-style sockets only future associations are effected
2955 * by the change). With TCP-style sockets, this option is inherited by
2956 * sockets derived from a listener socket.
2958 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2960 struct sctp_initmsg sinit;
2961 struct sctp_sock *sp = sctp_sk(sk);
2963 if (optlen != sizeof(struct sctp_initmsg))
2965 if (copy_from_user(&sinit, optval, optlen))
2968 if (sinit.sinit_num_ostreams)
2969 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2970 if (sinit.sinit_max_instreams)
2971 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2972 if (sinit.sinit_max_attempts)
2973 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2974 if (sinit.sinit_max_init_timeo)
2975 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2981 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2983 * Applications that wish to use the sendto() system call may wish to
2984 * specify a default set of parameters that would normally be supplied
2985 * through the inclusion of ancillary data. This socket option allows
2986 * such an application to set the default sctp_sndrcvinfo structure.
2987 * The application that wishes to use this socket option simply passes
2988 * in to this call the sctp_sndrcvinfo structure defined in Section
2989 * 5.2.2) The input parameters accepted by this call include
2990 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2991 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2992 * to this call if the caller is using the UDP model.
2994 static int sctp_setsockopt_default_send_param(struct sock *sk,
2995 char __user *optval,
2996 unsigned int optlen)
2998 struct sctp_sock *sp = sctp_sk(sk);
2999 struct sctp_association *asoc;
3000 struct sctp_sndrcvinfo info;
3002 if (optlen != sizeof(info))
3004 if (copy_from_user(&info, optval, optlen))
3006 if (info.sinfo_flags &
3007 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
3008 SCTP_ABORT | SCTP_EOF))
3011 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
3012 if (!asoc && info.sinfo_assoc_id > SCTP_ALL_ASSOC &&
3013 sctp_style(sk, UDP))
3017 asoc->default_stream = info.sinfo_stream;
3018 asoc->default_flags = info.sinfo_flags;
3019 asoc->default_ppid = info.sinfo_ppid;
3020 asoc->default_context = info.sinfo_context;
3021 asoc->default_timetolive = info.sinfo_timetolive;
3026 if (info.sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
3027 info.sinfo_assoc_id == SCTP_ALL_ASSOC) {
3028 sp->default_stream = info.sinfo_stream;
3029 sp->default_flags = info.sinfo_flags;
3030 sp->default_ppid = info.sinfo_ppid;
3031 sp->default_context = info.sinfo_context;
3032 sp->default_timetolive = info.sinfo_timetolive;
3035 if (info.sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
3036 info.sinfo_assoc_id == SCTP_ALL_ASSOC) {
3037 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3038 asoc->default_stream = info.sinfo_stream;
3039 asoc->default_flags = info.sinfo_flags;
3040 asoc->default_ppid = info.sinfo_ppid;
3041 asoc->default_context = info.sinfo_context;
3042 asoc->default_timetolive = info.sinfo_timetolive;
3049 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
3050 * (SCTP_DEFAULT_SNDINFO)
3052 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
3053 char __user *optval,
3054 unsigned int optlen)
3056 struct sctp_sock *sp = sctp_sk(sk);
3057 struct sctp_association *asoc;
3058 struct sctp_sndinfo info;
3060 if (optlen != sizeof(info))
3062 if (copy_from_user(&info, optval, optlen))
3064 if (info.snd_flags &
3065 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
3066 SCTP_ABORT | SCTP_EOF))
3069 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
3070 if (!asoc && info.snd_assoc_id > SCTP_ALL_ASSOC &&
3071 sctp_style(sk, UDP))
3075 asoc->default_stream = info.snd_sid;
3076 asoc->default_flags = info.snd_flags;
3077 asoc->default_ppid = info.snd_ppid;
3078 asoc->default_context = info.snd_context;
3083 if (info.snd_assoc_id == SCTP_FUTURE_ASSOC ||
3084 info.snd_assoc_id == SCTP_ALL_ASSOC) {
3085 sp->default_stream = info.snd_sid;
3086 sp->default_flags = info.snd_flags;
3087 sp->default_ppid = info.snd_ppid;
3088 sp->default_context = info.snd_context;
3091 if (info.snd_assoc_id == SCTP_CURRENT_ASSOC ||
3092 info.snd_assoc_id == SCTP_ALL_ASSOC) {
3093 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3094 asoc->default_stream = info.snd_sid;
3095 asoc->default_flags = info.snd_flags;
3096 asoc->default_ppid = info.snd_ppid;
3097 asoc->default_context = info.snd_context;
3104 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3106 * Requests that the local SCTP stack use the enclosed peer address as
3107 * the association primary. The enclosed address must be one of the
3108 * association peer's addresses.
3110 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
3111 unsigned int optlen)
3113 struct sctp_prim prim;
3114 struct sctp_transport *trans;
3118 if (optlen != sizeof(struct sctp_prim))
3121 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
3124 /* Allow security module to validate address but need address len. */
3125 af = sctp_get_af_specific(prim.ssp_addr.ss_family);
3129 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3130 (struct sockaddr *)&prim.ssp_addr,
3135 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
3139 sctp_assoc_set_primary(trans->asoc, trans);
3145 * 7.1.5 SCTP_NODELAY
3147 * Turn on/off any Nagle-like algorithm. This means that packets are
3148 * generally sent as soon as possible and no unnecessary delays are
3149 * introduced, at the cost of more packets in the network. Expects an
3150 * integer boolean flag.
3152 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
3153 unsigned int optlen)
3157 if (optlen < sizeof(int))
3159 if (get_user(val, (int __user *)optval))
3162 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
3168 * 7.1.1 SCTP_RTOINFO
3170 * The protocol parameters used to initialize and bound retransmission
3171 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3172 * and modify these parameters.
3173 * All parameters are time values, in milliseconds. A value of 0, when
3174 * modifying the parameters, indicates that the current value should not
3178 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
3180 struct sctp_rtoinfo rtoinfo;
3181 struct sctp_association *asoc;
3182 unsigned long rto_min, rto_max;
3183 struct sctp_sock *sp = sctp_sk(sk);
3185 if (optlen != sizeof (struct sctp_rtoinfo))
3188 if (copy_from_user(&rtoinfo, optval, optlen))
3191 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
3193 /* Set the values to the specific association */
3194 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
3195 sctp_style(sk, UDP))
3198 rto_max = rtoinfo.srto_max;
3199 rto_min = rtoinfo.srto_min;
3202 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3204 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3207 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3209 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3211 if (rto_min > rto_max)
3215 if (rtoinfo.srto_initial != 0)
3217 msecs_to_jiffies(rtoinfo.srto_initial);
3218 asoc->rto_max = rto_max;
3219 asoc->rto_min = rto_min;
3221 /* If there is no association or the association-id = 0
3222 * set the values to the endpoint.
3224 if (rtoinfo.srto_initial != 0)
3225 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3226 sp->rtoinfo.srto_max = rto_max;
3227 sp->rtoinfo.srto_min = rto_min;
3235 * 7.1.2 SCTP_ASSOCINFO
3237 * This option is used to tune the maximum retransmission attempts
3238 * of the association.
3239 * Returns an error if the new association retransmission value is
3240 * greater than the sum of the retransmission value of the peer.
3241 * See [SCTP] for more information.
3244 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3247 struct sctp_assocparams assocparams;
3248 struct sctp_association *asoc;
3250 if (optlen != sizeof(struct sctp_assocparams))
3252 if (copy_from_user(&assocparams, optval, optlen))
3255 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3257 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3258 sctp_style(sk, UDP))
3261 /* Set the values to the specific association */
3263 if (assocparams.sasoc_asocmaxrxt != 0) {
3266 struct sctp_transport *peer_addr;
3268 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3270 path_sum += peer_addr->pathmaxrxt;
3274 /* Only validate asocmaxrxt if we have more than
3275 * one path/transport. We do this because path
3276 * retransmissions are only counted when we have more
3280 assocparams.sasoc_asocmaxrxt > path_sum)
3283 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3286 if (assocparams.sasoc_cookie_life != 0)
3287 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3289 /* Set the values to the endpoint */
3290 struct sctp_sock *sp = sctp_sk(sk);
3292 if (assocparams.sasoc_asocmaxrxt != 0)
3293 sp->assocparams.sasoc_asocmaxrxt =
3294 assocparams.sasoc_asocmaxrxt;
3295 if (assocparams.sasoc_cookie_life != 0)
3296 sp->assocparams.sasoc_cookie_life =
3297 assocparams.sasoc_cookie_life;
3303 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3305 * This socket option is a boolean flag which turns on or off mapped V4
3306 * addresses. If this option is turned on and the socket is type
3307 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3308 * If this option is turned off, then no mapping will be done of V4
3309 * addresses and a user will receive both PF_INET6 and PF_INET type
3310 * addresses on the socket.
3312 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3315 struct sctp_sock *sp = sctp_sk(sk);
3317 if (optlen < sizeof(int))
3319 if (get_user(val, (int __user *)optval))
3330 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3331 * This option will get or set the maximum size to put in any outgoing
3332 * SCTP DATA chunk. If a message is larger than this size it will be
3333 * fragmented by SCTP into the specified size. Note that the underlying
3334 * SCTP implementation may fragment into smaller sized chunks when the
3335 * PMTU of the underlying association is smaller than the value set by
3336 * the user. The default value for this option is '0' which indicates
3337 * the user is NOT limiting fragmentation and only the PMTU will effect
3338 * SCTP's choice of DATA chunk size. Note also that values set larger
3339 * than the maximum size of an IP datagram will effectively let SCTP
3340 * control fragmentation (i.e. the same as setting this option to 0).
3342 * The following structure is used to access and modify this parameter:
3344 * struct sctp_assoc_value {
3345 * sctp_assoc_t assoc_id;
3346 * uint32_t assoc_value;
3349 * assoc_id: This parameter is ignored for one-to-one style sockets.
3350 * For one-to-many style sockets this parameter indicates which
3351 * association the user is performing an action upon. Note that if
3352 * this field's value is zero then the endpoints default value is
3353 * changed (effecting future associations only).
3354 * assoc_value: This parameter specifies the maximum size in bytes.
3356 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3358 struct sctp_sock *sp = sctp_sk(sk);
3359 struct sctp_assoc_value params;
3360 struct sctp_association *asoc;
3363 if (optlen == sizeof(int)) {
3364 pr_warn_ratelimited(DEPRECATED
3366 "Use of int in maxseg socket option.\n"
3367 "Use struct sctp_assoc_value instead\n",
3368 current->comm, task_pid_nr(current));
3369 if (copy_from_user(&val, optval, optlen))
3371 params.assoc_id = SCTP_FUTURE_ASSOC;
3372 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3373 if (copy_from_user(¶ms, optval, optlen))
3375 val = params.assoc_value;
3380 asoc = sctp_id2assoc(sk, params.assoc_id);
3381 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
3382 sctp_style(sk, UDP))
3386 int min_len, max_len;
3387 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3388 sizeof(struct sctp_data_chunk);
3390 min_len = sctp_min_frag_point(sp, datasize);
3391 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3393 if (val < min_len || val > max_len)
3398 asoc->user_frag = val;
3399 sctp_assoc_update_frag_point(asoc);
3401 sp->user_frag = val;
3409 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3411 * Requests that the peer mark the enclosed address as the association
3412 * primary. The enclosed address must be one of the association's
3413 * locally bound addresses. The following structure is used to make a
3414 * set primary request:
3416 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3417 unsigned int optlen)
3419 struct net *net = sock_net(sk);
3420 struct sctp_sock *sp;
3421 struct sctp_association *asoc = NULL;
3422 struct sctp_setpeerprim prim;
3423 struct sctp_chunk *chunk;
3429 if (!net->sctp.addip_enable)
3432 if (optlen != sizeof(struct sctp_setpeerprim))
3435 if (copy_from_user(&prim, optval, optlen))
3438 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3442 if (!asoc->peer.asconf_capable)
3445 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3448 if (!sctp_state(asoc, ESTABLISHED))
3451 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3455 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3456 return -EADDRNOTAVAIL;
3458 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3459 return -EADDRNOTAVAIL;
3461 /* Allow security module to validate address. */
3462 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3463 (struct sockaddr *)&prim.sspp_addr,
3468 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3469 chunk = sctp_make_asconf_set_prim(asoc,
3470 (union sctp_addr *)&prim.sspp_addr);
3474 err = sctp_send_asconf(asoc, chunk);
3476 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3481 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3482 unsigned int optlen)
3484 struct sctp_setadaptation adaptation;
3486 if (optlen != sizeof(struct sctp_setadaptation))
3488 if (copy_from_user(&adaptation, optval, optlen))
3491 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3497 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3499 * The context field in the sctp_sndrcvinfo structure is normally only
3500 * used when a failed message is retrieved holding the value that was
3501 * sent down on the actual send call. This option allows the setting of
3502 * a default context on an association basis that will be received on
3503 * reading messages from the peer. This is especially helpful in the
3504 * one-2-many model for an application to keep some reference to an
3505 * internal state machine that is processing messages on the
3506 * association. Note that the setting of this value only effects
3507 * received messages from the peer and does not effect the value that is
3508 * saved with outbound messages.
3510 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3511 unsigned int optlen)
3513 struct sctp_sock *sp = sctp_sk(sk);
3514 struct sctp_assoc_value params;
3515 struct sctp_association *asoc;
3517 if (optlen != sizeof(struct sctp_assoc_value))
3519 if (copy_from_user(¶ms, optval, optlen))
3522 asoc = sctp_id2assoc(sk, params.assoc_id);
3523 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
3524 sctp_style(sk, UDP))
3528 asoc->default_rcv_context = params.assoc_value;
3533 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
3534 params.assoc_id == SCTP_ALL_ASSOC)
3535 sp->default_rcv_context = params.assoc_value;
3537 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
3538 params.assoc_id == SCTP_ALL_ASSOC)
3539 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3540 asoc->default_rcv_context = params.assoc_value;
3546 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3548 * This options will at a minimum specify if the implementation is doing
3549 * fragmented interleave. Fragmented interleave, for a one to many
3550 * socket, is when subsequent calls to receive a message may return
3551 * parts of messages from different associations. Some implementations
3552 * may allow you to turn this value on or off. If so, when turned off,
3553 * no fragment interleave will occur (which will cause a head of line
3554 * blocking amongst multiple associations sharing the same one to many
3555 * socket). When this option is turned on, then each receive call may
3556 * come from a different association (thus the user must receive data
3557 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3558 * association each receive belongs to.
3560 * This option takes a boolean value. A non-zero value indicates that
3561 * fragmented interleave is on. A value of zero indicates that
3562 * fragmented interleave is off.
3564 * Note that it is important that an implementation that allows this
3565 * option to be turned on, have it off by default. Otherwise an unaware
3566 * application using the one to many model may become confused and act
3569 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3570 char __user *optval,
3571 unsigned int optlen)
3575 if (optlen != sizeof(int))
3577 if (get_user(val, (int __user *)optval))
3580 sctp_sk(sk)->frag_interleave = !!val;
3582 if (!sctp_sk(sk)->frag_interleave)
3583 sctp_sk(sk)->strm_interleave = 0;
3589 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3590 * (SCTP_PARTIAL_DELIVERY_POINT)
3592 * This option will set or get the SCTP partial delivery point. This
3593 * point is the size of a message where the partial delivery API will be
3594 * invoked to help free up rwnd space for the peer. Setting this to a
3595 * lower value will cause partial deliveries to happen more often. The
3596 * calls argument is an integer that sets or gets the partial delivery
3597 * point. Note also that the call will fail if the user attempts to set
3598 * this value larger than the socket receive buffer size.
3600 * Note that any single message having a length smaller than or equal to
3601 * the SCTP partial delivery point will be delivered in one single read
3602 * call as long as the user provided buffer is large enough to hold the
3605 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3606 char __user *optval,
3607 unsigned int optlen)
3611 if (optlen != sizeof(u32))
3613 if (get_user(val, (int __user *)optval))
3616 /* Note: We double the receive buffer from what the user sets
3617 * it to be, also initial rwnd is based on rcvbuf/2.
3619 if (val > (sk->sk_rcvbuf >> 1))
3622 sctp_sk(sk)->pd_point = val;
3624 return 0; /* is this the right error code? */
3628 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3630 * This option will allow a user to change the maximum burst of packets
3631 * that can be emitted by this association. Note that the default value
3632 * is 4, and some implementations may restrict this setting so that it
3633 * can only be lowered.
3635 * NOTE: This text doesn't seem right. Do this on a socket basis with
3636 * future associations inheriting the socket value.
3638 static int sctp_setsockopt_maxburst(struct sock *sk,
3639 char __user *optval,
3640 unsigned int optlen)
3642 struct sctp_sock *sp = sctp_sk(sk);
3643 struct sctp_assoc_value params;
3644 struct sctp_association *asoc;
3646 if (optlen == sizeof(int)) {
3647 pr_warn_ratelimited(DEPRECATED
3649 "Use of int in max_burst socket option deprecated.\n"
3650 "Use struct sctp_assoc_value instead\n",
3651 current->comm, task_pid_nr(current));
3652 if (copy_from_user(¶ms.assoc_value, optval, optlen))
3654 params.assoc_id = SCTP_FUTURE_ASSOC;
3655 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3656 if (copy_from_user(¶ms, optval, optlen))
3661 asoc = sctp_id2assoc(sk, params.assoc_id);
3662 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
3663 sctp_style(sk, UDP))
3667 asoc->max_burst = params.assoc_value;
3672 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
3673 params.assoc_id == SCTP_ALL_ASSOC)
3674 sp->max_burst = params.assoc_value;
3676 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
3677 params.assoc_id == SCTP_ALL_ASSOC)
3678 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3679 asoc->max_burst = params.assoc_value;
3685 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3687 * This set option adds a chunk type that the user is requesting to be
3688 * received only in an authenticated way. Changes to the list of chunks
3689 * will only effect future associations on the socket.
3691 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3692 char __user *optval,
3693 unsigned int optlen)
3695 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3696 struct sctp_authchunk val;
3698 if (!ep->auth_enable)
3701 if (optlen != sizeof(struct sctp_authchunk))
3703 if (copy_from_user(&val, optval, optlen))
3706 switch (val.sauth_chunk) {
3708 case SCTP_CID_INIT_ACK:
3709 case SCTP_CID_SHUTDOWN_COMPLETE:
3714 /* add this chunk id to the endpoint */
3715 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3719 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3721 * This option gets or sets the list of HMAC algorithms that the local
3722 * endpoint requires the peer to use.
3724 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3725 char __user *optval,
3726 unsigned int optlen)
3728 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3729 struct sctp_hmacalgo *hmacs;
3733 if (!ep->auth_enable)
3736 if (optlen < sizeof(struct sctp_hmacalgo))
3738 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3739 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3741 hmacs = memdup_user(optval, optlen);
3743 return PTR_ERR(hmacs);
3745 idents = hmacs->shmac_num_idents;
3746 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3747 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3752 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3759 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3761 * This option will set a shared secret key which is used to build an
3762 * association shared key.
3764 static int sctp_setsockopt_auth_key(struct sock *sk,
3765 char __user *optval,
3766 unsigned int optlen)
3768 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3769 struct sctp_authkey *authkey;
3770 struct sctp_association *asoc;
3773 if (!ep->auth_enable)
3776 if (optlen <= sizeof(struct sctp_authkey))
3778 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3781 optlen = min_t(unsigned int, optlen, USHRT_MAX +
3782 sizeof(struct sctp_authkey));
3784 authkey = memdup_user(optval, optlen);
3785 if (IS_ERR(authkey))
3786 return PTR_ERR(authkey);
3788 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3793 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3794 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3799 ret = sctp_auth_set_key(ep, asoc, authkey);
3806 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3808 * This option will get or set the active shared key to be used to build
3809 * the association shared key.
3811 static int sctp_setsockopt_active_key(struct sock *sk,
3812 char __user *optval,
3813 unsigned int optlen)
3815 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3816 struct sctp_authkeyid val;
3817 struct sctp_association *asoc;
3819 if (!ep->auth_enable)
3822 if (optlen != sizeof(struct sctp_authkeyid))
3824 if (copy_from_user(&val, optval, optlen))
3827 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3828 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3831 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3835 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3837 * This set option will delete a shared secret key from use.
3839 static int sctp_setsockopt_del_key(struct sock *sk,
3840 char __user *optval,
3841 unsigned int optlen)
3843 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3844 struct sctp_authkeyid val;
3845 struct sctp_association *asoc;
3847 if (!ep->auth_enable)
3850 if (optlen != sizeof(struct sctp_authkeyid))
3852 if (copy_from_user(&val, optval, optlen))
3855 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3856 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3859 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3864 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3866 * This set option will deactivate a shared secret key.
3868 static int sctp_setsockopt_deactivate_key(struct sock *sk, char __user *optval,
3869 unsigned int optlen)
3871 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3872 struct sctp_authkeyid val;
3873 struct sctp_association *asoc;
3875 if (!ep->auth_enable)
3878 if (optlen != sizeof(struct sctp_authkeyid))
3880 if (copy_from_user(&val, optval, optlen))
3883 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3884 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3887 return sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3891 * 8.1.23 SCTP_AUTO_ASCONF
3893 * This option will enable or disable the use of the automatic generation of
3894 * ASCONF chunks to add and delete addresses to an existing association. Note
3895 * that this option has two caveats namely: a) it only affects sockets that
3896 * are bound to all addresses available to the SCTP stack, and b) the system
3897 * administrator may have an overriding control that turns the ASCONF feature
3898 * off no matter what setting the socket option may have.
3899 * This option expects an integer boolean flag, where a non-zero value turns on
3900 * the option, and a zero value turns off the option.
3901 * Note. In this implementation, socket operation overrides default parameter
3902 * being set by sysctl as well as FreeBSD implementation
3904 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3905 unsigned int optlen)
3908 struct sctp_sock *sp = sctp_sk(sk);
3910 if (optlen < sizeof(int))
3912 if (get_user(val, (int __user *)optval))
3914 if (!sctp_is_ep_boundall(sk) && val)
3916 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3919 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3920 if (val == 0 && sp->do_auto_asconf) {
3921 list_del(&sp->auto_asconf_list);
3922 sp->do_auto_asconf = 0;
3923 } else if (val && !sp->do_auto_asconf) {
3924 list_add_tail(&sp->auto_asconf_list,
3925 &sock_net(sk)->sctp.auto_asconf_splist);
3926 sp->do_auto_asconf = 1;
3928 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3933 * SCTP_PEER_ADDR_THLDS
3935 * This option allows us to alter the partially failed threshold for one or all
3936 * transports in an association. See Section 6.1 of:
3937 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3939 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3940 char __user *optval,
3941 unsigned int optlen)
3943 struct sctp_paddrthlds val;
3944 struct sctp_transport *trans;
3945 struct sctp_association *asoc;
3947 if (optlen < sizeof(struct sctp_paddrthlds))
3949 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3950 sizeof(struct sctp_paddrthlds)))
3953 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3954 trans = sctp_addr_id2transport(sk, &val.spt_address,
3959 if (val.spt_pathmaxrxt)
3960 trans->pathmaxrxt = val.spt_pathmaxrxt;
3961 trans->pf_retrans = val.spt_pathpfthld;
3966 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3967 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
3968 sctp_style(sk, UDP))
3972 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3974 if (val.spt_pathmaxrxt)
3975 trans->pathmaxrxt = val.spt_pathmaxrxt;
3976 trans->pf_retrans = val.spt_pathpfthld;
3979 if (val.spt_pathmaxrxt)
3980 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3981 asoc->pf_retrans = val.spt_pathpfthld;
3983 struct sctp_sock *sp = sctp_sk(sk);
3985 if (val.spt_pathmaxrxt)
3986 sp->pathmaxrxt = val.spt_pathmaxrxt;
3987 sp->pf_retrans = val.spt_pathpfthld;
3993 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3994 char __user *optval,
3995 unsigned int optlen)
3999 if (optlen < sizeof(int))
4001 if (get_user(val, (int __user *) optval))
4004 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
4009 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
4010 char __user *optval,
4011 unsigned int optlen)
4015 if (optlen < sizeof(int))
4017 if (get_user(val, (int __user *) optval))
4020 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
4025 static int sctp_setsockopt_pr_supported(struct sock *sk,
4026 char __user *optval,
4027 unsigned int optlen)
4029 struct sctp_assoc_value params;
4030 struct sctp_association *asoc;
4032 if (optlen != sizeof(params))
4035 if (copy_from_user(¶ms, optval, optlen))
4038 asoc = sctp_id2assoc(sk, params.assoc_id);
4039 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4040 sctp_style(sk, UDP))
4043 sctp_sk(sk)->ep->prsctp_enable = !!params.assoc_value;
4048 static int sctp_setsockopt_default_prinfo(struct sock *sk,
4049 char __user *optval,
4050 unsigned int optlen)
4052 struct sctp_default_prinfo info;
4053 struct sctp_association *asoc;
4054 int retval = -EINVAL;
4056 if (optlen != sizeof(info))
4059 if (copy_from_user(&info, optval, sizeof(info))) {
4064 if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
4067 if (info.pr_policy == SCTP_PR_SCTP_NONE)
4070 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
4072 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4073 asoc->default_timetolive = info.pr_value;
4074 } else if (!info.pr_assoc_id) {
4075 struct sctp_sock *sp = sctp_sk(sk);
4077 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
4078 sp->default_timetolive = info.pr_value;
4089 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4090 char __user *optval,
4091 unsigned int optlen)
4093 struct sctp_assoc_value params;
4094 struct sctp_association *asoc;
4095 int retval = -EINVAL;
4097 if (optlen != sizeof(params))
4100 if (copy_from_user(¶ms, optval, optlen)) {
4105 asoc = sctp_id2assoc(sk, params.assoc_id);
4106 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4107 sctp_style(sk, UDP))
4111 asoc->reconf_enable = !!params.assoc_value;
4113 sctp_sk(sk)->ep->reconf_enable = !!params.assoc_value;
4121 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4122 char __user *optval,
4123 unsigned int optlen)
4125 struct sctp_assoc_value params;
4126 struct sctp_association *asoc;
4127 int retval = -EINVAL;
4129 if (optlen != sizeof(params))
4132 if (copy_from_user(¶ms, optval, optlen)) {
4137 if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4140 asoc = sctp_id2assoc(sk, params.assoc_id);
4142 asoc->strreset_enable = params.assoc_value;
4143 } else if (!params.assoc_id) {
4144 struct sctp_sock *sp = sctp_sk(sk);
4146 sp->ep->strreset_enable = params.assoc_value;
4157 static int sctp_setsockopt_reset_streams(struct sock *sk,
4158 char __user *optval,
4159 unsigned int optlen)
4161 struct sctp_reset_streams *params;
4162 struct sctp_association *asoc;
4163 int retval = -EINVAL;
4165 if (optlen < sizeof(*params))
4167 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4168 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4169 sizeof(__u16) * sizeof(*params));
4171 params = memdup_user(optval, optlen);
4173 return PTR_ERR(params);
4175 if (params->srs_number_streams * sizeof(__u16) >
4176 optlen - sizeof(*params))
4179 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4183 retval = sctp_send_reset_streams(asoc, params);
4190 static int sctp_setsockopt_reset_assoc(struct sock *sk,
4191 char __user *optval,
4192 unsigned int optlen)
4194 struct sctp_association *asoc;
4195 sctp_assoc_t associd;
4196 int retval = -EINVAL;
4198 if (optlen != sizeof(associd))
4201 if (copy_from_user(&associd, optval, optlen)) {
4206 asoc = sctp_id2assoc(sk, associd);
4210 retval = sctp_send_reset_assoc(asoc);
4216 static int sctp_setsockopt_add_streams(struct sock *sk,
4217 char __user *optval,
4218 unsigned int optlen)
4220 struct sctp_association *asoc;
4221 struct sctp_add_streams params;
4222 int retval = -EINVAL;
4224 if (optlen != sizeof(params))
4227 if (copy_from_user(¶ms, optval, optlen)) {
4232 asoc = sctp_id2assoc(sk, params.sas_assoc_id);
4236 retval = sctp_send_add_streams(asoc, ¶ms);
4242 static int sctp_setsockopt_scheduler(struct sock *sk,
4243 char __user *optval,
4244 unsigned int optlen)
4246 struct sctp_association *asoc;
4247 struct sctp_assoc_value params;
4248 int retval = -EINVAL;
4250 if (optlen < sizeof(params))
4253 optlen = sizeof(params);
4254 if (copy_from_user(¶ms, optval, optlen)) {
4259 if (params.assoc_value > SCTP_SS_MAX)
4262 asoc = sctp_id2assoc(sk, params.assoc_id);
4266 retval = sctp_sched_set_sched(asoc, params.assoc_value);
4272 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4273 char __user *optval,
4274 unsigned int optlen)
4276 struct sctp_stream_value params;
4277 struct sctp_association *asoc;
4278 int retval = -EINVAL;
4280 if (optlen < sizeof(params))
4283 optlen = sizeof(params);
4284 if (copy_from_user(¶ms, optval, optlen)) {
4289 asoc = sctp_id2assoc(sk, params.assoc_id);
4290 if (!asoc && params.assoc_id != SCTP_CURRENT_ASSOC &&
4291 sctp_style(sk, UDP))
4295 retval = sctp_sched_set_value(asoc, params.stream_id,
4296 params.stream_value, GFP_KERNEL);
4302 list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4303 int ret = sctp_sched_set_value(asoc, params.stream_id,
4304 params.stream_value, GFP_KERNEL);
4305 if (ret && !retval) /* try to return the 1st error. */
4313 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4314 char __user *optval,
4315 unsigned int optlen)
4317 struct sctp_sock *sp = sctp_sk(sk);
4318 struct sctp_assoc_value params;
4319 struct sctp_association *asoc;
4320 int retval = -EINVAL;
4322 if (optlen < sizeof(params))
4325 optlen = sizeof(params);
4326 if (copy_from_user(¶ms, optval, optlen)) {
4331 asoc = sctp_id2assoc(sk, params.assoc_id);
4332 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4333 sctp_style(sk, UDP))
4336 if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4341 sp->strm_interleave = !!params.assoc_value;
4349 static int sctp_setsockopt_reuse_port(struct sock *sk, char __user *optval,
4350 unsigned int optlen)
4354 if (!sctp_style(sk, TCP))
4357 if (sctp_sk(sk)->ep->base.bind_addr.port)
4360 if (optlen < sizeof(int))
4363 if (get_user(val, (int __user *)optval))
4366 sctp_sk(sk)->reuse = !!val;
4371 static int sctp_setsockopt_event(struct sock *sk, char __user *optval,
4372 unsigned int optlen)
4374 struct sctp_association *asoc;
4375 struct sctp_ulpevent *event;
4376 struct sctp_event param;
4379 if (optlen < sizeof(param)) {
4384 optlen = sizeof(param);
4385 if (copy_from_user(¶m, optval, optlen)) {
4390 if (param.se_type < SCTP_SN_TYPE_BASE ||
4391 param.se_type > SCTP_SN_TYPE_MAX) {
4396 asoc = sctp_id2assoc(sk, param.se_assoc_id);
4398 sctp_ulpevent_type_set(&sctp_sk(sk)->subscribe,
4399 param.se_type, param.se_on);
4403 sctp_ulpevent_type_set(&asoc->subscribe, param.se_type, param.se_on);
4405 if (param.se_type == SCTP_SENDER_DRY_EVENT && param.se_on) {
4406 if (sctp_outq_is_empty(&asoc->outqueue)) {
4407 event = sctp_ulpevent_make_sender_dry_event(asoc,
4408 GFP_USER | __GFP_NOWARN);
4414 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4422 /* API 6.2 setsockopt(), getsockopt()
4424 * Applications use setsockopt() and getsockopt() to set or retrieve
4425 * socket options. Socket options are used to change the default
4426 * behavior of sockets calls. They are described in Section 7.
4430 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4431 * int __user *optlen);
4432 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4435 * sd - the socket descript.
4436 * level - set to IPPROTO_SCTP for all SCTP options.
4437 * optname - the option name.
4438 * optval - the buffer to store the value of the option.
4439 * optlen - the size of the buffer.
4441 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4442 char __user *optval, unsigned int optlen)
4446 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4448 /* I can hardly begin to describe how wrong this is. This is
4449 * so broken as to be worse than useless. The API draft
4450 * REALLY is NOT helpful here... I am not convinced that the
4451 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4452 * are at all well-founded.
4454 if (level != SOL_SCTP) {
4455 struct sctp_af *af = sctp_sk(sk)->pf->af;
4456 retval = af->setsockopt(sk, level, optname, optval, optlen);
4463 case SCTP_SOCKOPT_BINDX_ADD:
4464 /* 'optlen' is the size of the addresses buffer. */
4465 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4466 optlen, SCTP_BINDX_ADD_ADDR);
4469 case SCTP_SOCKOPT_BINDX_REM:
4470 /* 'optlen' is the size of the addresses buffer. */
4471 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4472 optlen, SCTP_BINDX_REM_ADDR);
4475 case SCTP_SOCKOPT_CONNECTX_OLD:
4476 /* 'optlen' is the size of the addresses buffer. */
4477 retval = sctp_setsockopt_connectx_old(sk,
4478 (struct sockaddr __user *)optval,
4482 case SCTP_SOCKOPT_CONNECTX:
4483 /* 'optlen' is the size of the addresses buffer. */
4484 retval = sctp_setsockopt_connectx(sk,
4485 (struct sockaddr __user *)optval,
4489 case SCTP_DISABLE_FRAGMENTS:
4490 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4494 retval = sctp_setsockopt_events(sk, optval, optlen);
4497 case SCTP_AUTOCLOSE:
4498 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4501 case SCTP_PEER_ADDR_PARAMS:
4502 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4505 case SCTP_DELAYED_SACK:
4506 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4508 case SCTP_PARTIAL_DELIVERY_POINT:
4509 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4513 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4515 case SCTP_DEFAULT_SEND_PARAM:
4516 retval = sctp_setsockopt_default_send_param(sk, optval,
4519 case SCTP_DEFAULT_SNDINFO:
4520 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4522 case SCTP_PRIMARY_ADDR:
4523 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4525 case SCTP_SET_PEER_PRIMARY_ADDR:
4526 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4529 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4532 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4534 case SCTP_ASSOCINFO:
4535 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4537 case SCTP_I_WANT_MAPPED_V4_ADDR:
4538 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4541 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4543 case SCTP_ADAPTATION_LAYER:
4544 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4547 retval = sctp_setsockopt_context(sk, optval, optlen);
4549 case SCTP_FRAGMENT_INTERLEAVE:
4550 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4552 case SCTP_MAX_BURST:
4553 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4555 case SCTP_AUTH_CHUNK:
4556 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4558 case SCTP_HMAC_IDENT:
4559 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4562 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4564 case SCTP_AUTH_ACTIVE_KEY:
4565 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4567 case SCTP_AUTH_DELETE_KEY:
4568 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4570 case SCTP_AUTH_DEACTIVATE_KEY:
4571 retval = sctp_setsockopt_deactivate_key(sk, optval, optlen);
4573 case SCTP_AUTO_ASCONF:
4574 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4576 case SCTP_PEER_ADDR_THLDS:
4577 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
4579 case SCTP_RECVRCVINFO:
4580 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4582 case SCTP_RECVNXTINFO:
4583 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4585 case SCTP_PR_SUPPORTED:
4586 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4588 case SCTP_DEFAULT_PRINFO:
4589 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4591 case SCTP_RECONFIG_SUPPORTED:
4592 retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4594 case SCTP_ENABLE_STREAM_RESET:
4595 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4597 case SCTP_RESET_STREAMS:
4598 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4600 case SCTP_RESET_ASSOC:
4601 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4603 case SCTP_ADD_STREAMS:
4604 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4606 case SCTP_STREAM_SCHEDULER:
4607 retval = sctp_setsockopt_scheduler(sk, optval, optlen);
4609 case SCTP_STREAM_SCHEDULER_VALUE:
4610 retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
4612 case SCTP_INTERLEAVING_SUPPORTED:
4613 retval = sctp_setsockopt_interleaving_supported(sk, optval,
4616 case SCTP_REUSE_PORT:
4617 retval = sctp_setsockopt_reuse_port(sk, optval, optlen);
4620 retval = sctp_setsockopt_event(sk, optval, optlen);
4623 retval = -ENOPROTOOPT;
4633 /* API 3.1.6 connect() - UDP Style Syntax
4635 * An application may use the connect() call in the UDP model to initiate an
4636 * association without sending data.
4640 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4642 * sd: the socket descriptor to have a new association added to.
4644 * nam: the address structure (either struct sockaddr_in or struct
4645 * sockaddr_in6 defined in RFC2553 [7]).
4647 * len: the size of the address.
4649 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4650 int addr_len, int flags)
4652 struct inet_sock *inet = inet_sk(sk);
4658 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4661 /* We may need to bind the socket. */
4662 if (!inet->inet_num) {
4663 if (sk->sk_prot->get_port(sk, 0)) {
4667 inet->inet_sport = htons(inet->inet_num);
4670 /* Validate addr_len before calling common connect/connectx routine. */
4671 af = sctp_get_af_specific(addr->sa_family);
4672 if (!af || addr_len < af->sockaddr_len) {
4675 /* Pass correct addr len to common routine (so it knows there
4676 * is only one address being passed.
4678 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4685 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4686 int addr_len, int flags)
4688 if (addr_len < sizeof(uaddr->sa_family))
4691 if (uaddr->sa_family == AF_UNSPEC)
4694 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4697 /* FIXME: Write comments. */
4698 static int sctp_disconnect(struct sock *sk, int flags)
4700 return -EOPNOTSUPP; /* STUB */
4703 /* 4.1.4 accept() - TCP Style Syntax
4705 * Applications use accept() call to remove an established SCTP
4706 * association from the accept queue of the endpoint. A new socket
4707 * descriptor will be returned from accept() to represent the newly
4708 * formed association.
4710 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4712 struct sctp_sock *sp;
4713 struct sctp_endpoint *ep;
4714 struct sock *newsk = NULL;
4715 struct sctp_association *asoc;
4724 if (!sctp_style(sk, TCP)) {
4725 error = -EOPNOTSUPP;
4729 if (!sctp_sstate(sk, LISTENING)) {
4734 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4736 error = sctp_wait_for_accept(sk, timeo);
4740 /* We treat the list of associations on the endpoint as the accept
4741 * queue and pick the first association on the list.
4743 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4745 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4751 /* Populate the fields of the newsk from the oldsk and migrate the
4752 * asoc to the newsk.
4754 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4762 /* The SCTP ioctl handler. */
4763 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4770 * SEQPACKET-style sockets in LISTENING state are valid, for
4771 * SCTP, so only discard TCP-style sockets in LISTENING state.
4773 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4778 struct sk_buff *skb;
4779 unsigned int amount = 0;
4781 skb = skb_peek(&sk->sk_receive_queue);
4784 * We will only return the amount of this packet since
4785 * that is all that will be read.
4789 rc = put_user(amount, (int __user *)arg);
4801 /* This is the function which gets called during socket creation to
4802 * initialized the SCTP-specific portion of the sock.
4803 * The sock structure should already be zero-filled memory.
4805 static int sctp_init_sock(struct sock *sk)
4807 struct net *net = sock_net(sk);
4808 struct sctp_sock *sp;
4810 pr_debug("%s: sk:%p\n", __func__, sk);
4814 /* Initialize the SCTP per socket area. */
4815 switch (sk->sk_type) {
4816 case SOCK_SEQPACKET:
4817 sp->type = SCTP_SOCKET_UDP;
4820 sp->type = SCTP_SOCKET_TCP;
4823 return -ESOCKTNOSUPPORT;
4826 sk->sk_gso_type = SKB_GSO_SCTP;
4828 /* Initialize default send parameters. These parameters can be
4829 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4831 sp->default_stream = 0;
4832 sp->default_ppid = 0;
4833 sp->default_flags = 0;
4834 sp->default_context = 0;
4835 sp->default_timetolive = 0;
4837 sp->default_rcv_context = 0;
4838 sp->max_burst = net->sctp.max_burst;
4840 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4842 /* Initialize default setup parameters. These parameters
4843 * can be modified with the SCTP_INITMSG socket option or
4844 * overridden by the SCTP_INIT CMSG.
4846 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4847 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4848 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4849 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4851 /* Initialize default RTO related parameters. These parameters can
4852 * be modified for with the SCTP_RTOINFO socket option.
4854 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4855 sp->rtoinfo.srto_max = net->sctp.rto_max;
4856 sp->rtoinfo.srto_min = net->sctp.rto_min;
4858 /* Initialize default association related parameters. These parameters
4859 * can be modified with the SCTP_ASSOCINFO socket option.
4861 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4862 sp->assocparams.sasoc_number_peer_destinations = 0;
4863 sp->assocparams.sasoc_peer_rwnd = 0;
4864 sp->assocparams.sasoc_local_rwnd = 0;
4865 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4867 /* Initialize default event subscriptions. By default, all the
4872 /* Default Peer Address Parameters. These defaults can
4873 * be modified via SCTP_PEER_ADDR_PARAMS
4875 sp->hbinterval = net->sctp.hb_interval;
4876 sp->pathmaxrxt = net->sctp.max_retrans_path;
4877 sp->pf_retrans = net->sctp.pf_retrans;
4878 sp->pathmtu = 0; /* allow default discovery */
4879 sp->sackdelay = net->sctp.sack_timeout;
4881 sp->param_flags = SPP_HB_ENABLE |
4883 SPP_SACKDELAY_ENABLE;
4885 /* If enabled no SCTP message fragmentation will be performed.
4886 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4888 sp->disable_fragments = 0;
4890 /* Enable Nagle algorithm by default. */
4893 sp->recvrcvinfo = 0;
4894 sp->recvnxtinfo = 0;
4896 /* Enable by default. */
4899 /* Auto-close idle associations after the configured
4900 * number of seconds. A value of 0 disables this
4901 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4902 * for UDP-style sockets only.
4906 /* User specified fragmentation limit. */
4909 sp->adaptation_ind = 0;
4911 sp->pf = sctp_get_pf_specific(sk->sk_family);
4913 /* Control variables for partial data delivery. */
4914 atomic_set(&sp->pd_mode, 0);
4915 skb_queue_head_init(&sp->pd_lobby);
4916 sp->frag_interleave = 0;
4918 /* Create a per socket endpoint structure. Even if we
4919 * change the data structure relationships, this may still
4920 * be useful for storing pre-connect address information.
4922 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4928 sk->sk_destruct = sctp_destruct_sock;
4930 SCTP_DBG_OBJCNT_INC(sock);
4933 sk_sockets_allocated_inc(sk);
4934 sock_prot_inuse_add(net, sk->sk_prot, 1);
4936 /* Nothing can fail after this block, otherwise
4937 * sctp_destroy_sock() will be called without addr_wq_lock held
4939 if (net->sctp.default_auto_asconf) {
4940 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4941 list_add_tail(&sp->auto_asconf_list,
4942 &net->sctp.auto_asconf_splist);
4943 sp->do_auto_asconf = 1;
4944 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4946 sp->do_auto_asconf = 0;
4954 /* Cleanup any SCTP per socket resources. Must be called with
4955 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4957 static void sctp_destroy_sock(struct sock *sk)
4959 struct sctp_sock *sp;
4961 pr_debug("%s: sk:%p\n", __func__, sk);
4963 /* Release our hold on the endpoint. */
4965 /* This could happen during socket init, thus we bail out
4966 * early, since the rest of the below is not setup either.
4971 if (sp->do_auto_asconf) {
4972 sp->do_auto_asconf = 0;
4973 list_del(&sp->auto_asconf_list);
4975 sctp_endpoint_free(sp->ep);
4977 sk_sockets_allocated_dec(sk);
4978 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4982 /* Triggered when there are no references on the socket anymore */
4983 static void sctp_destruct_sock(struct sock *sk)
4985 struct sctp_sock *sp = sctp_sk(sk);
4987 /* Free up the HMAC transform. */
4988 crypto_free_shash(sp->hmac);
4990 inet_sock_destruct(sk);
4993 /* API 4.1.7 shutdown() - TCP Style Syntax
4994 * int shutdown(int socket, int how);
4996 * sd - the socket descriptor of the association to be closed.
4997 * how - Specifies the type of shutdown. The values are
5000 * Disables further receive operations. No SCTP
5001 * protocol action is taken.
5003 * Disables further send operations, and initiates
5004 * the SCTP shutdown sequence.
5006 * Disables further send and receive operations
5007 * and initiates the SCTP shutdown sequence.
5009 static void sctp_shutdown(struct sock *sk, int how)
5011 struct net *net = sock_net(sk);
5012 struct sctp_endpoint *ep;
5014 if (!sctp_style(sk, TCP))
5017 ep = sctp_sk(sk)->ep;
5018 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5019 struct sctp_association *asoc;
5021 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5022 asoc = list_entry(ep->asocs.next,
5023 struct sctp_association, asocs);
5024 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5028 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5029 struct sctp_info *info)
5031 struct sctp_transport *prim;
5032 struct list_head *pos;
5035 memset(info, 0, sizeof(*info));
5037 struct sctp_sock *sp = sctp_sk(sk);
5039 info->sctpi_s_autoclose = sp->autoclose;
5040 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5041 info->sctpi_s_pd_point = sp->pd_point;
5042 info->sctpi_s_nodelay = sp->nodelay;
5043 info->sctpi_s_disable_fragments = sp->disable_fragments;
5044 info->sctpi_s_v4mapped = sp->v4mapped;
5045 info->sctpi_s_frag_interleave = sp->frag_interleave;
5046 info->sctpi_s_type = sp->type;
5051 info->sctpi_tag = asoc->c.my_vtag;
5052 info->sctpi_state = asoc->state;
5053 info->sctpi_rwnd = asoc->a_rwnd;
5054 info->sctpi_unackdata = asoc->unack_data;
5055 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5056 info->sctpi_instrms = asoc->stream.incnt;
5057 info->sctpi_outstrms = asoc->stream.outcnt;
5058 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5059 info->sctpi_inqueue++;
5060 list_for_each(pos, &asoc->outqueue.out_chunk_list)
5061 info->sctpi_outqueue++;
5062 info->sctpi_overall_error = asoc->overall_error_count;
5063 info->sctpi_max_burst = asoc->max_burst;
5064 info->sctpi_maxseg = asoc->frag_point;
5065 info->sctpi_peer_rwnd = asoc->peer.rwnd;
5066 info->sctpi_peer_tag = asoc->c.peer_vtag;
5068 mask = asoc->peer.ecn_capable << 1;
5069 mask = (mask | asoc->peer.ipv4_address) << 1;
5070 mask = (mask | asoc->peer.ipv6_address) << 1;
5071 mask = (mask | asoc->peer.hostname_address) << 1;
5072 mask = (mask | asoc->peer.asconf_capable) << 1;
5073 mask = (mask | asoc->peer.prsctp_capable) << 1;
5074 mask = (mask | asoc->peer.auth_capable);
5075 info->sctpi_peer_capable = mask;
5076 mask = asoc->peer.sack_needed << 1;
5077 mask = (mask | asoc->peer.sack_generation) << 1;
5078 mask = (mask | asoc->peer.zero_window_announced);
5079 info->sctpi_peer_sack = mask;
5081 info->sctpi_isacks = asoc->stats.isacks;
5082 info->sctpi_osacks = asoc->stats.osacks;
5083 info->sctpi_opackets = asoc->stats.opackets;
5084 info->sctpi_ipackets = asoc->stats.ipackets;
5085 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5086 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5087 info->sctpi_idupchunks = asoc->stats.idupchunks;
5088 info->sctpi_gapcnt = asoc->stats.gapcnt;
5089 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5090 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5091 info->sctpi_oodchunks = asoc->stats.oodchunks;
5092 info->sctpi_iodchunks = asoc->stats.iodchunks;
5093 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5094 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5096 prim = asoc->peer.primary_path;
5097 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5098 info->sctpi_p_state = prim->state;
5099 info->sctpi_p_cwnd = prim->cwnd;
5100 info->sctpi_p_srtt = prim->srtt;
5101 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5102 info->sctpi_p_hbinterval = prim->hbinterval;
5103 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5104 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5105 info->sctpi_p_ssthresh = prim->ssthresh;
5106 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5107 info->sctpi_p_flight_size = prim->flight_size;
5108 info->sctpi_p_error = prim->error_count;
5112 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5114 /* use callback to avoid exporting the core structure */
5115 void sctp_transport_walk_start(struct rhashtable_iter *iter)
5117 rhltable_walk_enter(&sctp_transport_hashtable, iter);
5119 rhashtable_walk_start(iter);
5122 void sctp_transport_walk_stop(struct rhashtable_iter *iter)
5124 rhashtable_walk_stop(iter);
5125 rhashtable_walk_exit(iter);
5128 struct sctp_transport *sctp_transport_get_next(struct net *net,
5129 struct rhashtable_iter *iter)
5131 struct sctp_transport *t;
5133 t = rhashtable_walk_next(iter);
5134 for (; t; t = rhashtable_walk_next(iter)) {
5136 if (PTR_ERR(t) == -EAGAIN)
5141 if (!sctp_transport_hold(t))
5144 if (net_eq(sock_net(t->asoc->base.sk), net) &&
5145 t->asoc->peer.primary_path == t)
5148 sctp_transport_put(t);
5154 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5155 struct rhashtable_iter *iter,
5158 struct sctp_transport *t;
5161 return SEQ_START_TOKEN;
5163 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5166 sctp_transport_put(t);
5172 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5176 struct sctp_ep_common *epb;
5177 struct sctp_hashbucket *head;
5179 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5181 read_lock_bh(&head->lock);
5182 sctp_for_each_hentry(epb, &head->chain) {
5183 err = cb(sctp_ep(epb), p);
5187 read_unlock_bh(&head->lock);
5192 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5194 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5196 const union sctp_addr *laddr,
5197 const union sctp_addr *paddr, void *p)
5199 struct sctp_transport *transport;
5203 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5208 err = cb(transport, p);
5209 sctp_transport_put(transport);
5213 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5215 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5216 int (*cb_done)(struct sctp_transport *, void *),
5217 struct net *net, int *pos, void *p) {
5218 struct rhashtable_iter hti;
5219 struct sctp_transport *tsp;
5224 sctp_transport_walk_start(&hti);
5226 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5227 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5232 sctp_transport_put(tsp);
5234 sctp_transport_walk_stop(&hti);
5237 if (cb_done && !cb_done(tsp, p)) {
5239 sctp_transport_put(tsp);
5242 sctp_transport_put(tsp);
5247 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5249 /* 7.2.1 Association Status (SCTP_STATUS)
5251 * Applications can retrieve current status information about an
5252 * association, including association state, peer receiver window size,
5253 * number of unacked data chunks, and number of data chunks pending
5254 * receipt. This information is read-only.
5256 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5257 char __user *optval,
5260 struct sctp_status status;
5261 struct sctp_association *asoc = NULL;
5262 struct sctp_transport *transport;
5263 sctp_assoc_t associd;
5266 if (len < sizeof(status)) {
5271 len = sizeof(status);
5272 if (copy_from_user(&status, optval, len)) {
5277 associd = status.sstat_assoc_id;
5278 asoc = sctp_id2assoc(sk, associd);
5284 transport = asoc->peer.primary_path;
5286 status.sstat_assoc_id = sctp_assoc2id(asoc);
5287 status.sstat_state = sctp_assoc_to_state(asoc);
5288 status.sstat_rwnd = asoc->peer.rwnd;
5289 status.sstat_unackdata = asoc->unack_data;
5291 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5292 status.sstat_instrms = asoc->stream.incnt;
5293 status.sstat_outstrms = asoc->stream.outcnt;
5294 status.sstat_fragmentation_point = asoc->frag_point;
5295 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5296 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5297 transport->af_specific->sockaddr_len);
5298 /* Map ipv4 address into v4-mapped-on-v6 address. */
5299 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5300 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5301 status.sstat_primary.spinfo_state = transport->state;
5302 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5303 status.sstat_primary.spinfo_srtt = transport->srtt;
5304 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5305 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5307 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5308 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5310 if (put_user(len, optlen)) {
5315 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5316 __func__, len, status.sstat_state, status.sstat_rwnd,
5317 status.sstat_assoc_id);
5319 if (copy_to_user(optval, &status, len)) {
5329 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5331 * Applications can retrieve information about a specific peer address
5332 * of an association, including its reachability state, congestion
5333 * window, and retransmission timer values. This information is
5336 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5337 char __user *optval,
5340 struct sctp_paddrinfo pinfo;
5341 struct sctp_transport *transport;
5344 if (len < sizeof(pinfo)) {
5349 len = sizeof(pinfo);
5350 if (copy_from_user(&pinfo, optval, len)) {
5355 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5356 pinfo.spinfo_assoc_id);
5360 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5361 pinfo.spinfo_state = transport->state;
5362 pinfo.spinfo_cwnd = transport->cwnd;
5363 pinfo.spinfo_srtt = transport->srtt;
5364 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5365 pinfo.spinfo_mtu = transport->pathmtu;
5367 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5368 pinfo.spinfo_state = SCTP_ACTIVE;
5370 if (put_user(len, optlen)) {
5375 if (copy_to_user(optval, &pinfo, len)) {
5384 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5386 * This option is a on/off flag. If enabled no SCTP message
5387 * fragmentation will be performed. Instead if a message being sent
5388 * exceeds the current PMTU size, the message will NOT be sent and
5389 * instead a error will be indicated to the user.
5391 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5392 char __user *optval, int __user *optlen)
5396 if (len < sizeof(int))
5400 val = (sctp_sk(sk)->disable_fragments == 1);
5401 if (put_user(len, optlen))
5403 if (copy_to_user(optval, &val, len))
5408 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5410 * This socket option is used to specify various notifications and
5411 * ancillary data the user wishes to receive.
5413 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5416 struct sctp_event_subscribe subscribe;
5417 __u8 *sn_type = (__u8 *)&subscribe;
5422 if (len > sizeof(struct sctp_event_subscribe))
5423 len = sizeof(struct sctp_event_subscribe);
5424 if (put_user(len, optlen))
5427 for (i = 0; i < len; i++)
5428 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5429 SCTP_SN_TYPE_BASE + i);
5431 if (copy_to_user(optval, &subscribe, len))
5437 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5439 * This socket option is applicable to the UDP-style socket only. When
5440 * set it will cause associations that are idle for more than the
5441 * specified number of seconds to automatically close. An association
5442 * being idle is defined an association that has NOT sent or received
5443 * user data. The special value of '0' indicates that no automatic
5444 * close of any associations should be performed. The option expects an
5445 * integer defining the number of seconds of idle time before an
5446 * association is closed.
5448 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5450 /* Applicable to UDP-style socket only */
5451 if (sctp_style(sk, TCP))
5453 if (len < sizeof(int))
5456 if (put_user(len, optlen))
5458 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5463 /* Helper routine to branch off an association to a new socket. */
5464 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5466 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5467 struct sctp_sock *sp = sctp_sk(sk);
5468 struct socket *sock;
5471 /* Do not peel off from one netns to another one. */
5472 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5478 /* An association cannot be branched off from an already peeled-off
5479 * socket, nor is this supported for tcp style sockets.
5481 if (!sctp_style(sk, UDP))
5484 /* Create a new socket. */
5485 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5489 sctp_copy_sock(sock->sk, sk, asoc);
5491 /* Make peeled-off sockets more like 1-1 accepted sockets.
5492 * Set the daddr and initialize id to something more random and also
5493 * copy over any ip options.
5495 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5496 sp->pf->copy_ip_options(sk, sock->sk);
5498 /* Populate the fields of the newsk from the oldsk and migrate the
5499 * asoc to the newsk.
5501 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5507 EXPORT_SYMBOL(sctp_do_peeloff);
5509 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5510 struct file **newfile, unsigned flags)
5512 struct socket *newsock;
5515 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5519 /* Map the socket to an unused fd that can be returned to the user. */
5520 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5522 sock_release(newsock);
5526 *newfile = sock_alloc_file(newsock, 0, NULL);
5527 if (IS_ERR(*newfile)) {
5528 put_unused_fd(retval);
5529 retval = PTR_ERR(*newfile);
5534 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5537 peeloff->sd = retval;
5539 if (flags & SOCK_NONBLOCK)
5540 (*newfile)->f_flags |= O_NONBLOCK;
5545 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5547 sctp_peeloff_arg_t peeloff;
5548 struct file *newfile = NULL;
5551 if (len < sizeof(sctp_peeloff_arg_t))
5553 len = sizeof(sctp_peeloff_arg_t);
5554 if (copy_from_user(&peeloff, optval, len))
5557 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5561 /* Return the fd mapped to the new socket. */
5562 if (put_user(len, optlen)) {
5564 put_unused_fd(retval);
5568 if (copy_to_user(optval, &peeloff, len)) {
5570 put_unused_fd(retval);
5573 fd_install(retval, newfile);
5578 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5579 char __user *optval, int __user *optlen)
5581 sctp_peeloff_flags_arg_t peeloff;
5582 struct file *newfile = NULL;
5585 if (len < sizeof(sctp_peeloff_flags_arg_t))
5587 len = sizeof(sctp_peeloff_flags_arg_t);
5588 if (copy_from_user(&peeloff, optval, len))
5591 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5592 &newfile, peeloff.flags);
5596 /* Return the fd mapped to the new socket. */
5597 if (put_user(len, optlen)) {
5599 put_unused_fd(retval);
5603 if (copy_to_user(optval, &peeloff, len)) {
5605 put_unused_fd(retval);
5608 fd_install(retval, newfile);
5613 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5615 * Applications can enable or disable heartbeats for any peer address of
5616 * an association, modify an address's heartbeat interval, force a
5617 * heartbeat to be sent immediately, and adjust the address's maximum
5618 * number of retransmissions sent before an address is considered
5619 * unreachable. The following structure is used to access and modify an
5620 * address's parameters:
5622 * struct sctp_paddrparams {
5623 * sctp_assoc_t spp_assoc_id;
5624 * struct sockaddr_storage spp_address;
5625 * uint32_t spp_hbinterval;
5626 * uint16_t spp_pathmaxrxt;
5627 * uint32_t spp_pathmtu;
5628 * uint32_t spp_sackdelay;
5629 * uint32_t spp_flags;
5632 * spp_assoc_id - (one-to-many style socket) This is filled in the
5633 * application, and identifies the association for
5635 * spp_address - This specifies which address is of interest.
5636 * spp_hbinterval - This contains the value of the heartbeat interval,
5637 * in milliseconds. If a value of zero
5638 * is present in this field then no changes are to
5639 * be made to this parameter.
5640 * spp_pathmaxrxt - This contains the maximum number of
5641 * retransmissions before this address shall be
5642 * considered unreachable. If a value of zero
5643 * is present in this field then no changes are to
5644 * be made to this parameter.
5645 * spp_pathmtu - When Path MTU discovery is disabled the value
5646 * specified here will be the "fixed" path mtu.
5647 * Note that if the spp_address field is empty
5648 * then all associations on this address will
5649 * have this fixed path mtu set upon them.
5651 * spp_sackdelay - When delayed sack is enabled, this value specifies
5652 * the number of milliseconds that sacks will be delayed
5653 * for. This value will apply to all addresses of an
5654 * association if the spp_address field is empty. Note
5655 * also, that if delayed sack is enabled and this
5656 * value is set to 0, no change is made to the last
5657 * recorded delayed sack timer value.
5659 * spp_flags - These flags are used to control various features
5660 * on an association. The flag field may contain
5661 * zero or more of the following options.
5663 * SPP_HB_ENABLE - Enable heartbeats on the
5664 * specified address. Note that if the address
5665 * field is empty all addresses for the association
5666 * have heartbeats enabled upon them.
5668 * SPP_HB_DISABLE - Disable heartbeats on the
5669 * speicifed address. Note that if the address
5670 * field is empty all addresses for the association
5671 * will have their heartbeats disabled. Note also
5672 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5673 * mutually exclusive, only one of these two should
5674 * be specified. Enabling both fields will have
5675 * undetermined results.
5677 * SPP_HB_DEMAND - Request a user initiated heartbeat
5678 * to be made immediately.
5680 * SPP_PMTUD_ENABLE - This field will enable PMTU
5681 * discovery upon the specified address. Note that
5682 * if the address feild is empty then all addresses
5683 * on the association are effected.
5685 * SPP_PMTUD_DISABLE - This field will disable PMTU
5686 * discovery upon the specified address. Note that
5687 * if the address feild is empty then all addresses
5688 * on the association are effected. Not also that
5689 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5690 * exclusive. Enabling both will have undetermined
5693 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5694 * on delayed sack. The time specified in spp_sackdelay
5695 * is used to specify the sack delay for this address. Note
5696 * that if spp_address is empty then all addresses will
5697 * enable delayed sack and take on the sack delay
5698 * value specified in spp_sackdelay.
5699 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5700 * off delayed sack. If the spp_address field is blank then
5701 * delayed sack is disabled for the entire association. Note
5702 * also that this field is mutually exclusive to
5703 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5706 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5707 * setting of the IPV6 flow label value. The value is
5708 * contained in the spp_ipv6_flowlabel field.
5709 * Upon retrieval, this flag will be set to indicate that
5710 * the spp_ipv6_flowlabel field has a valid value returned.
5711 * If a specific destination address is set (in the
5712 * spp_address field), then the value returned is that of
5713 * the address. If just an association is specified (and
5714 * no address), then the association's default flow label
5715 * is returned. If neither an association nor a destination
5716 * is specified, then the socket's default flow label is
5717 * returned. For non-IPv6 sockets, this flag will be left
5720 * SPP_DSCP: Setting this flag enables the setting of the
5721 * Differentiated Services Code Point (DSCP) value
5722 * associated with either the association or a specific
5723 * address. The value is obtained in the spp_dscp field.
5724 * Upon retrieval, this flag will be set to indicate that
5725 * the spp_dscp field has a valid value returned. If a
5726 * specific destination address is set when called (in the
5727 * spp_address field), then that specific destination
5728 * address's DSCP value is returned. If just an association
5729 * is specified, then the association's default DSCP is
5730 * returned. If neither an association nor a destination is
5731 * specified, then the socket's default DSCP is returned.
5733 * spp_ipv6_flowlabel
5734 * - This field is used in conjunction with the
5735 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5736 * The 20 least significant bits are used for the flow
5737 * label. This setting has precedence over any IPv6-layer
5740 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5741 * and contains the DSCP. The 6 most significant bits are
5742 * used for the DSCP. This setting has precedence over any
5743 * IPv4- or IPv6- layer setting.
5745 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5746 char __user *optval, int __user *optlen)
5748 struct sctp_paddrparams params;
5749 struct sctp_transport *trans = NULL;
5750 struct sctp_association *asoc = NULL;
5751 struct sctp_sock *sp = sctp_sk(sk);
5753 if (len >= sizeof(params))
5754 len = sizeof(params);
5755 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5756 spp_ipv6_flowlabel), 4))
5757 len = ALIGN(offsetof(struct sctp_paddrparams,
5758 spp_ipv6_flowlabel), 4);
5762 if (copy_from_user(¶ms, optval, len))
5765 /* If an address other than INADDR_ANY is specified, and
5766 * no transport is found, then the request is invalid.
5768 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5769 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5770 params.spp_assoc_id);
5772 pr_debug("%s: failed no transport\n", __func__);
5777 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5778 * socket is a one to many style socket, and an association
5779 * was not found, then the id was invalid.
5781 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5782 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5783 sctp_style(sk, UDP)) {
5784 pr_debug("%s: failed no association\n", __func__);
5789 /* Fetch transport values. */
5790 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5791 params.spp_pathmtu = trans->pathmtu;
5792 params.spp_pathmaxrxt = trans->pathmaxrxt;
5793 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5795 /*draft-11 doesn't say what to return in spp_flags*/
5796 params.spp_flags = trans->param_flags;
5797 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5798 params.spp_ipv6_flowlabel = trans->flowlabel &
5799 SCTP_FLOWLABEL_VAL_MASK;
5800 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5802 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5803 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5804 params.spp_flags |= SPP_DSCP;
5807 /* Fetch association values. */
5808 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5809 params.spp_pathmtu = asoc->pathmtu;
5810 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5811 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5813 /*draft-11 doesn't say what to return in spp_flags*/
5814 params.spp_flags = asoc->param_flags;
5815 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5816 params.spp_ipv6_flowlabel = asoc->flowlabel &
5817 SCTP_FLOWLABEL_VAL_MASK;
5818 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5820 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5821 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5822 params.spp_flags |= SPP_DSCP;
5825 /* Fetch socket values. */
5826 params.spp_hbinterval = sp->hbinterval;
5827 params.spp_pathmtu = sp->pathmtu;
5828 params.spp_sackdelay = sp->sackdelay;
5829 params.spp_pathmaxrxt = sp->pathmaxrxt;
5831 /*draft-11 doesn't say what to return in spp_flags*/
5832 params.spp_flags = sp->param_flags;
5833 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5834 params.spp_ipv6_flowlabel = sp->flowlabel &
5835 SCTP_FLOWLABEL_VAL_MASK;
5836 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5838 if (sp->dscp & SCTP_DSCP_SET_MASK) {
5839 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
5840 params.spp_flags |= SPP_DSCP;
5844 if (copy_to_user(optval, ¶ms, len))
5847 if (put_user(len, optlen))
5854 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5856 * This option will effect the way delayed acks are performed. This
5857 * option allows you to get or set the delayed ack time, in
5858 * milliseconds. It also allows changing the delayed ack frequency.
5859 * Changing the frequency to 1 disables the delayed sack algorithm. If
5860 * the assoc_id is 0, then this sets or gets the endpoints default
5861 * values. If the assoc_id field is non-zero, then the set or get
5862 * effects the specified association for the one to many model (the
5863 * assoc_id field is ignored by the one to one model). Note that if
5864 * sack_delay or sack_freq are 0 when setting this option, then the
5865 * current values will remain unchanged.
5867 * struct sctp_sack_info {
5868 * sctp_assoc_t sack_assoc_id;
5869 * uint32_t sack_delay;
5870 * uint32_t sack_freq;
5873 * sack_assoc_id - This parameter, indicates which association the user
5874 * is performing an action upon. Note that if this field's value is
5875 * zero then the endpoints default value is changed (effecting future
5876 * associations only).
5878 * sack_delay - This parameter contains the number of milliseconds that
5879 * the user is requesting the delayed ACK timer be set to. Note that
5880 * this value is defined in the standard to be between 200 and 500
5883 * sack_freq - This parameter contains the number of packets that must
5884 * be received before a sack is sent without waiting for the delay
5885 * timer to expire. The default value for this is 2, setting this
5886 * value to 1 will disable the delayed sack algorithm.
5888 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5889 char __user *optval,
5892 struct sctp_sack_info params;
5893 struct sctp_association *asoc = NULL;
5894 struct sctp_sock *sp = sctp_sk(sk);
5896 if (len >= sizeof(struct sctp_sack_info)) {
5897 len = sizeof(struct sctp_sack_info);
5899 if (copy_from_user(¶ms, optval, len))
5901 } else if (len == sizeof(struct sctp_assoc_value)) {
5902 pr_warn_ratelimited(DEPRECATED
5904 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5905 "Use struct sctp_sack_info instead\n",
5906 current->comm, task_pid_nr(current));
5907 if (copy_from_user(¶ms, optval, len))
5912 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
5913 * socket is a one to many style socket, and an association
5914 * was not found, then the id was invalid.
5916 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5917 if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
5918 sctp_style(sk, UDP))
5922 /* Fetch association values. */
5923 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
5924 params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
5925 params.sack_freq = asoc->sackfreq;
5928 params.sack_delay = 0;
5929 params.sack_freq = 1;
5932 /* Fetch socket values. */
5933 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
5934 params.sack_delay = sp->sackdelay;
5935 params.sack_freq = sp->sackfreq;
5937 params.sack_delay = 0;
5938 params.sack_freq = 1;
5942 if (copy_to_user(optval, ¶ms, len))
5945 if (put_user(len, optlen))
5951 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5953 * Applications can specify protocol parameters for the default association
5954 * initialization. The option name argument to setsockopt() and getsockopt()
5957 * Setting initialization parameters is effective only on an unconnected
5958 * socket (for UDP-style sockets only future associations are effected
5959 * by the change). With TCP-style sockets, this option is inherited by
5960 * sockets derived from a listener socket.
5962 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
5964 if (len < sizeof(struct sctp_initmsg))
5966 len = sizeof(struct sctp_initmsg);
5967 if (put_user(len, optlen))
5969 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
5975 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
5976 char __user *optval, int __user *optlen)
5978 struct sctp_association *asoc;
5980 struct sctp_getaddrs getaddrs;
5981 struct sctp_transport *from;
5983 union sctp_addr temp;
5984 struct sctp_sock *sp = sctp_sk(sk);
5989 if (len < sizeof(struct sctp_getaddrs))
5992 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5995 /* For UDP-style sockets, id specifies the association to query. */
5996 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6000 to = optval + offsetof(struct sctp_getaddrs, addrs);
6001 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6003 list_for_each_entry(from, &asoc->peer.transport_addr_list,
6005 memcpy(&temp, &from->ipaddr, sizeof(temp));
6006 addrlen = sctp_get_pf_specific(sk->sk_family)
6007 ->addr_to_user(sp, &temp);
6008 if (space_left < addrlen)
6010 if (copy_to_user(to, &temp, addrlen))
6014 space_left -= addrlen;
6017 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6019 bytes_copied = ((char __user *)to) - optval;
6020 if (put_user(bytes_copied, optlen))
6026 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6027 size_t space_left, int *bytes_copied)
6029 struct sctp_sockaddr_entry *addr;
6030 union sctp_addr temp;
6033 struct net *net = sock_net(sk);
6036 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6040 if ((PF_INET == sk->sk_family) &&
6041 (AF_INET6 == addr->a.sa.sa_family))
6043 if ((PF_INET6 == sk->sk_family) &&
6044 inet_v6_ipv6only(sk) &&
6045 (AF_INET == addr->a.sa.sa_family))
6047 memcpy(&temp, &addr->a, sizeof(temp));
6048 if (!temp.v4.sin_port)
6049 temp.v4.sin_port = htons(port);
6051 addrlen = sctp_get_pf_specific(sk->sk_family)
6052 ->addr_to_user(sctp_sk(sk), &temp);
6054 if (space_left < addrlen) {
6058 memcpy(to, &temp, addrlen);
6062 space_left -= addrlen;
6063 *bytes_copied += addrlen;
6071 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6072 char __user *optval, int __user *optlen)
6074 struct sctp_bind_addr *bp;
6075 struct sctp_association *asoc;
6077 struct sctp_getaddrs getaddrs;
6078 struct sctp_sockaddr_entry *addr;
6080 union sctp_addr temp;
6081 struct sctp_sock *sp = sctp_sk(sk);
6085 int bytes_copied = 0;
6089 if (len < sizeof(struct sctp_getaddrs))
6092 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6096 * For UDP-style sockets, id specifies the association to query.
6097 * If the id field is set to the value '0' then the locally bound
6098 * addresses are returned without regard to any particular
6101 if (0 == getaddrs.assoc_id) {
6102 bp = &sctp_sk(sk)->ep->base.bind_addr;
6104 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6107 bp = &asoc->base.bind_addr;
6110 to = optval + offsetof(struct sctp_getaddrs, addrs);
6111 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6113 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6117 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6118 * addresses from the global local address list.
6120 if (sctp_list_single_entry(&bp->address_list)) {
6121 addr = list_entry(bp->address_list.next,
6122 struct sctp_sockaddr_entry, list);
6123 if (sctp_is_any(sk, &addr->a)) {
6124 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6125 space_left, &bytes_copied);
6135 /* Protection on the bound address list is not needed since
6136 * in the socket option context we hold a socket lock and
6137 * thus the bound address list can't change.
6139 list_for_each_entry(addr, &bp->address_list, list) {
6140 memcpy(&temp, &addr->a, sizeof(temp));
6141 addrlen = sctp_get_pf_specific(sk->sk_family)
6142 ->addr_to_user(sp, &temp);
6143 if (space_left < addrlen) {
6144 err = -ENOMEM; /*fixme: right error?*/
6147 memcpy(buf, &temp, addrlen);
6149 bytes_copied += addrlen;
6151 space_left -= addrlen;
6155 if (copy_to_user(to, addrs, bytes_copied)) {
6159 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6163 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6164 * but we can't change it anymore.
6166 if (put_user(bytes_copied, optlen))
6173 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6175 * Requests that the local SCTP stack use the enclosed peer address as
6176 * the association primary. The enclosed address must be one of the
6177 * association peer's addresses.
6179 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6180 char __user *optval, int __user *optlen)
6182 struct sctp_prim prim;
6183 struct sctp_association *asoc;
6184 struct sctp_sock *sp = sctp_sk(sk);
6186 if (len < sizeof(struct sctp_prim))
6189 len = sizeof(struct sctp_prim);
6191 if (copy_from_user(&prim, optval, len))
6194 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6198 if (!asoc->peer.primary_path)
6201 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6202 asoc->peer.primary_path->af_specific->sockaddr_len);
6204 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6205 (union sctp_addr *)&prim.ssp_addr);
6207 if (put_user(len, optlen))
6209 if (copy_to_user(optval, &prim, len))
6216 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6218 * Requests that the local endpoint set the specified Adaptation Layer
6219 * Indication parameter for all future INIT and INIT-ACK exchanges.
6221 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6222 char __user *optval, int __user *optlen)
6224 struct sctp_setadaptation adaptation;
6226 if (len < sizeof(struct sctp_setadaptation))
6229 len = sizeof(struct sctp_setadaptation);
6231 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6233 if (put_user(len, optlen))
6235 if (copy_to_user(optval, &adaptation, len))
6243 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6245 * Applications that wish to use the sendto() system call may wish to
6246 * specify a default set of parameters that would normally be supplied
6247 * through the inclusion of ancillary data. This socket option allows
6248 * such an application to set the default sctp_sndrcvinfo structure.
6251 * The application that wishes to use this socket option simply passes
6252 * in to this call the sctp_sndrcvinfo structure defined in Section
6253 * 5.2.2) The input parameters accepted by this call include
6254 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6255 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6256 * to this call if the caller is using the UDP model.
6258 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6260 static int sctp_getsockopt_default_send_param(struct sock *sk,
6261 int len, char __user *optval,
6264 struct sctp_sock *sp = sctp_sk(sk);
6265 struct sctp_association *asoc;
6266 struct sctp_sndrcvinfo info;
6268 if (len < sizeof(info))
6273 if (copy_from_user(&info, optval, len))
6276 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6277 if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6278 sctp_style(sk, UDP))
6282 info.sinfo_stream = asoc->default_stream;
6283 info.sinfo_flags = asoc->default_flags;
6284 info.sinfo_ppid = asoc->default_ppid;
6285 info.sinfo_context = asoc->default_context;
6286 info.sinfo_timetolive = asoc->default_timetolive;
6288 info.sinfo_stream = sp->default_stream;
6289 info.sinfo_flags = sp->default_flags;
6290 info.sinfo_ppid = sp->default_ppid;
6291 info.sinfo_context = sp->default_context;
6292 info.sinfo_timetolive = sp->default_timetolive;
6295 if (put_user(len, optlen))
6297 if (copy_to_user(optval, &info, len))
6303 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6304 * (SCTP_DEFAULT_SNDINFO)
6306 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6307 char __user *optval,
6310 struct sctp_sock *sp = sctp_sk(sk);
6311 struct sctp_association *asoc;
6312 struct sctp_sndinfo info;
6314 if (len < sizeof(info))
6319 if (copy_from_user(&info, optval, len))
6322 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6323 if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6324 sctp_style(sk, UDP))
6328 info.snd_sid = asoc->default_stream;
6329 info.snd_flags = asoc->default_flags;
6330 info.snd_ppid = asoc->default_ppid;
6331 info.snd_context = asoc->default_context;
6333 info.snd_sid = sp->default_stream;
6334 info.snd_flags = sp->default_flags;
6335 info.snd_ppid = sp->default_ppid;
6336 info.snd_context = sp->default_context;
6339 if (put_user(len, optlen))
6341 if (copy_to_user(optval, &info, len))
6349 * 7.1.5 SCTP_NODELAY
6351 * Turn on/off any Nagle-like algorithm. This means that packets are
6352 * generally sent as soon as possible and no unnecessary delays are
6353 * introduced, at the cost of more packets in the network. Expects an
6354 * integer boolean flag.
6357 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6358 char __user *optval, int __user *optlen)
6362 if (len < sizeof(int))
6366 val = (sctp_sk(sk)->nodelay == 1);
6367 if (put_user(len, optlen))
6369 if (copy_to_user(optval, &val, len))
6376 * 7.1.1 SCTP_RTOINFO
6378 * The protocol parameters used to initialize and bound retransmission
6379 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6380 * and modify these parameters.
6381 * All parameters are time values, in milliseconds. A value of 0, when
6382 * modifying the parameters, indicates that the current value should not
6386 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6387 char __user *optval,
6388 int __user *optlen) {
6389 struct sctp_rtoinfo rtoinfo;
6390 struct sctp_association *asoc;
6392 if (len < sizeof (struct sctp_rtoinfo))
6395 len = sizeof(struct sctp_rtoinfo);
6397 if (copy_from_user(&rtoinfo, optval, len))
6400 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6402 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6403 sctp_style(sk, UDP))
6406 /* Values corresponding to the specific association. */
6408 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6409 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6410 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6412 /* Values corresponding to the endpoint. */
6413 struct sctp_sock *sp = sctp_sk(sk);
6415 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6416 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6417 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6420 if (put_user(len, optlen))
6423 if (copy_to_user(optval, &rtoinfo, len))
6431 * 7.1.2 SCTP_ASSOCINFO
6433 * This option is used to tune the maximum retransmission attempts
6434 * of the association.
6435 * Returns an error if the new association retransmission value is
6436 * greater than the sum of the retransmission value of the peer.
6437 * See [SCTP] for more information.
6440 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6441 char __user *optval,
6445 struct sctp_assocparams assocparams;
6446 struct sctp_association *asoc;
6447 struct list_head *pos;
6450 if (len < sizeof (struct sctp_assocparams))
6453 len = sizeof(struct sctp_assocparams);
6455 if (copy_from_user(&assocparams, optval, len))
6458 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6460 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6461 sctp_style(sk, UDP))
6464 /* Values correspoinding to the specific association */
6466 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6467 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6468 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6469 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6471 list_for_each(pos, &asoc->peer.transport_addr_list) {
6475 assocparams.sasoc_number_peer_destinations = cnt;
6477 /* Values corresponding to the endpoint */
6478 struct sctp_sock *sp = sctp_sk(sk);
6480 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6481 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6482 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6483 assocparams.sasoc_cookie_life =
6484 sp->assocparams.sasoc_cookie_life;
6485 assocparams.sasoc_number_peer_destinations =
6487 sasoc_number_peer_destinations;
6490 if (put_user(len, optlen))
6493 if (copy_to_user(optval, &assocparams, len))
6500 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6502 * This socket option is a boolean flag which turns on or off mapped V4
6503 * addresses. If this option is turned on and the socket is type
6504 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6505 * If this option is turned off, then no mapping will be done of V4
6506 * addresses and a user will receive both PF_INET6 and PF_INET type
6507 * addresses on the socket.
6509 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6510 char __user *optval, int __user *optlen)
6513 struct sctp_sock *sp = sctp_sk(sk);
6515 if (len < sizeof(int))
6520 if (put_user(len, optlen))
6522 if (copy_to_user(optval, &val, len))
6529 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6530 * (chapter and verse is quoted at sctp_setsockopt_context())
6532 static int sctp_getsockopt_context(struct sock *sk, int len,
6533 char __user *optval, int __user *optlen)
6535 struct sctp_assoc_value params;
6536 struct sctp_association *asoc;
6538 if (len < sizeof(struct sctp_assoc_value))
6541 len = sizeof(struct sctp_assoc_value);
6543 if (copy_from_user(¶ms, optval, len))
6546 asoc = sctp_id2assoc(sk, params.assoc_id);
6547 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6548 sctp_style(sk, UDP))
6551 params.assoc_value = asoc ? asoc->default_rcv_context
6552 : sctp_sk(sk)->default_rcv_context;
6554 if (put_user(len, optlen))
6556 if (copy_to_user(optval, ¶ms, len))
6563 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6564 * This option will get or set the maximum size to put in any outgoing
6565 * SCTP DATA chunk. If a message is larger than this size it will be
6566 * fragmented by SCTP into the specified size. Note that the underlying
6567 * SCTP implementation may fragment into smaller sized chunks when the
6568 * PMTU of the underlying association is smaller than the value set by
6569 * the user. The default value for this option is '0' which indicates
6570 * the user is NOT limiting fragmentation and only the PMTU will effect
6571 * SCTP's choice of DATA chunk size. Note also that values set larger
6572 * than the maximum size of an IP datagram will effectively let SCTP
6573 * control fragmentation (i.e. the same as setting this option to 0).
6575 * The following structure is used to access and modify this parameter:
6577 * struct sctp_assoc_value {
6578 * sctp_assoc_t assoc_id;
6579 * uint32_t assoc_value;
6582 * assoc_id: This parameter is ignored for one-to-one style sockets.
6583 * For one-to-many style sockets this parameter indicates which
6584 * association the user is performing an action upon. Note that if
6585 * this field's value is zero then the endpoints default value is
6586 * changed (effecting future associations only).
6587 * assoc_value: This parameter specifies the maximum size in bytes.
6589 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6590 char __user *optval, int __user *optlen)
6592 struct sctp_assoc_value params;
6593 struct sctp_association *asoc;
6595 if (len == sizeof(int)) {
6596 pr_warn_ratelimited(DEPRECATED
6598 "Use of int in maxseg socket option.\n"
6599 "Use struct sctp_assoc_value instead\n",
6600 current->comm, task_pid_nr(current));
6601 params.assoc_id = SCTP_FUTURE_ASSOC;
6602 } else if (len >= sizeof(struct sctp_assoc_value)) {
6603 len = sizeof(struct sctp_assoc_value);
6604 if (copy_from_user(¶ms, optval, len))
6609 asoc = sctp_id2assoc(sk, params.assoc_id);
6610 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6611 sctp_style(sk, UDP))
6615 params.assoc_value = asoc->frag_point;
6617 params.assoc_value = sctp_sk(sk)->user_frag;
6619 if (put_user(len, optlen))
6621 if (len == sizeof(int)) {
6622 if (copy_to_user(optval, ¶ms.assoc_value, len))
6625 if (copy_to_user(optval, ¶ms, len))
6633 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6634 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6636 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6637 char __user *optval, int __user *optlen)
6641 if (len < sizeof(int))
6646 val = sctp_sk(sk)->frag_interleave;
6647 if (put_user(len, optlen))
6649 if (copy_to_user(optval, &val, len))
6656 * 7.1.25. Set or Get the sctp partial delivery point
6657 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6659 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6660 char __user *optval,
6665 if (len < sizeof(u32))
6670 val = sctp_sk(sk)->pd_point;
6671 if (put_user(len, optlen))
6673 if (copy_to_user(optval, &val, len))
6680 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6681 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6683 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6684 char __user *optval,
6687 struct sctp_assoc_value params;
6688 struct sctp_association *asoc;
6690 if (len == sizeof(int)) {
6691 pr_warn_ratelimited(DEPRECATED
6693 "Use of int in max_burst socket option.\n"
6694 "Use struct sctp_assoc_value instead\n",
6695 current->comm, task_pid_nr(current));
6696 params.assoc_id = SCTP_FUTURE_ASSOC;
6697 } else if (len >= sizeof(struct sctp_assoc_value)) {
6698 len = sizeof(struct sctp_assoc_value);
6699 if (copy_from_user(¶ms, optval, len))
6704 asoc = sctp_id2assoc(sk, params.assoc_id);
6705 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6706 sctp_style(sk, UDP))
6709 params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6711 if (len == sizeof(int)) {
6712 if (copy_to_user(optval, ¶ms.assoc_value, len))
6715 if (copy_to_user(optval, ¶ms, len))
6723 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6724 char __user *optval, int __user *optlen)
6726 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6727 struct sctp_hmacalgo __user *p = (void __user *)optval;
6728 struct sctp_hmac_algo_param *hmacs;
6733 if (!ep->auth_enable)
6736 hmacs = ep->auth_hmacs_list;
6737 data_len = ntohs(hmacs->param_hdr.length) -
6738 sizeof(struct sctp_paramhdr);
6740 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6743 len = sizeof(struct sctp_hmacalgo) + data_len;
6744 num_idents = data_len / sizeof(u16);
6746 if (put_user(len, optlen))
6748 if (put_user(num_idents, &p->shmac_num_idents))
6750 for (i = 0; i < num_idents; i++) {
6751 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6753 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6759 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6760 char __user *optval, int __user *optlen)
6762 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6763 struct sctp_authkeyid val;
6764 struct sctp_association *asoc;
6766 if (!ep->auth_enable)
6769 if (len < sizeof(struct sctp_authkeyid))
6772 len = sizeof(struct sctp_authkeyid);
6773 if (copy_from_user(&val, optval, len))
6776 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6777 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6781 val.scact_keynumber = asoc->active_key_id;
6783 val.scact_keynumber = ep->active_key_id;
6785 if (put_user(len, optlen))
6787 if (copy_to_user(optval, &val, len))
6793 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6794 char __user *optval, int __user *optlen)
6796 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6797 struct sctp_authchunks __user *p = (void __user *)optval;
6798 struct sctp_authchunks val;
6799 struct sctp_association *asoc;
6800 struct sctp_chunks_param *ch;
6804 if (!ep->auth_enable)
6807 if (len < sizeof(struct sctp_authchunks))
6810 if (copy_from_user(&val, optval, sizeof(val)))
6813 to = p->gauth_chunks;
6814 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6818 ch = asoc->peer.peer_chunks;
6822 /* See if the user provided enough room for all the data */
6823 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6824 if (len < num_chunks)
6827 if (copy_to_user(to, ch->chunks, num_chunks))
6830 len = sizeof(struct sctp_authchunks) + num_chunks;
6831 if (put_user(len, optlen))
6833 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6838 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6839 char __user *optval, int __user *optlen)
6841 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6842 struct sctp_authchunks __user *p = (void __user *)optval;
6843 struct sctp_authchunks val;
6844 struct sctp_association *asoc;
6845 struct sctp_chunks_param *ch;
6849 if (!ep->auth_enable)
6852 if (len < sizeof(struct sctp_authchunks))
6855 if (copy_from_user(&val, optval, sizeof(val)))
6858 to = p->gauth_chunks;
6859 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6860 if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
6861 sctp_style(sk, UDP))
6864 ch = asoc ? (struct sctp_chunks_param *)asoc->c.auth_chunks
6865 : ep->auth_chunk_list;
6869 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6870 if (len < sizeof(struct sctp_authchunks) + num_chunks)
6873 if (copy_to_user(to, ch->chunks, num_chunks))
6876 len = sizeof(struct sctp_authchunks) + num_chunks;
6877 if (put_user(len, optlen))
6879 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6886 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6887 * This option gets the current number of associations that are attached
6888 * to a one-to-many style socket. The option value is an uint32_t.
6890 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
6891 char __user *optval, int __user *optlen)
6893 struct sctp_sock *sp = sctp_sk(sk);
6894 struct sctp_association *asoc;
6897 if (sctp_style(sk, TCP))
6900 if (len < sizeof(u32))
6905 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6909 if (put_user(len, optlen))
6911 if (copy_to_user(optval, &val, len))
6918 * 8.1.23 SCTP_AUTO_ASCONF
6919 * See the corresponding setsockopt entry as description
6921 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
6922 char __user *optval, int __user *optlen)
6926 if (len < sizeof(int))
6930 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
6932 if (put_user(len, optlen))
6934 if (copy_to_user(optval, &val, len))
6940 * 8.2.6. Get the Current Identifiers of Associations
6941 * (SCTP_GET_ASSOC_ID_LIST)
6943 * This option gets the current list of SCTP association identifiers of
6944 * the SCTP associations handled by a one-to-many style socket.
6946 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
6947 char __user *optval, int __user *optlen)
6949 struct sctp_sock *sp = sctp_sk(sk);
6950 struct sctp_association *asoc;
6951 struct sctp_assoc_ids *ids;
6954 if (sctp_style(sk, TCP))
6957 if (len < sizeof(struct sctp_assoc_ids))
6960 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6964 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
6967 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
6969 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
6973 ids->gaids_number_of_ids = num;
6975 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6976 ids->gaids_assoc_id[num++] = asoc->assoc_id;
6979 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
6989 * SCTP_PEER_ADDR_THLDS
6991 * This option allows us to fetch the partially failed threshold for one or all
6992 * transports in an association. See Section 6.1 of:
6993 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6995 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
6996 char __user *optval,
7000 struct sctp_paddrthlds val;
7001 struct sctp_transport *trans;
7002 struct sctp_association *asoc;
7004 if (len < sizeof(struct sctp_paddrthlds))
7006 len = sizeof(struct sctp_paddrthlds);
7007 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
7010 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7011 trans = sctp_addr_id2transport(sk, &val.spt_address,
7016 val.spt_pathmaxrxt = trans->pathmaxrxt;
7017 val.spt_pathpfthld = trans->pf_retrans;
7022 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7023 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7024 sctp_style(sk, UDP))
7028 val.spt_pathpfthld = asoc->pf_retrans;
7029 val.spt_pathmaxrxt = asoc->pathmaxrxt;
7031 struct sctp_sock *sp = sctp_sk(sk);
7033 val.spt_pathpfthld = sp->pf_retrans;
7034 val.spt_pathmaxrxt = sp->pathmaxrxt;
7037 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7044 * SCTP_GET_ASSOC_STATS
7046 * This option retrieves local per endpoint statistics. It is modeled
7047 * after OpenSolaris' implementation
7049 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7050 char __user *optval,
7053 struct sctp_assoc_stats sas;
7054 struct sctp_association *asoc = NULL;
7056 /* User must provide at least the assoc id */
7057 if (len < sizeof(sctp_assoc_t))
7060 /* Allow the struct to grow and fill in as much as possible */
7061 len = min_t(size_t, len, sizeof(sas));
7063 if (copy_from_user(&sas, optval, len))
7066 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7070 sas.sas_rtxchunks = asoc->stats.rtxchunks;
7071 sas.sas_gapcnt = asoc->stats.gapcnt;
7072 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7073 sas.sas_osacks = asoc->stats.osacks;
7074 sas.sas_isacks = asoc->stats.isacks;
7075 sas.sas_octrlchunks = asoc->stats.octrlchunks;
7076 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7077 sas.sas_oodchunks = asoc->stats.oodchunks;
7078 sas.sas_iodchunks = asoc->stats.iodchunks;
7079 sas.sas_ouodchunks = asoc->stats.ouodchunks;
7080 sas.sas_iuodchunks = asoc->stats.iuodchunks;
7081 sas.sas_idupchunks = asoc->stats.idupchunks;
7082 sas.sas_opackets = asoc->stats.opackets;
7083 sas.sas_ipackets = asoc->stats.ipackets;
7085 /* New high max rto observed, will return 0 if not a single
7086 * RTO update took place. obs_rto_ipaddr will be bogus
7089 sas.sas_maxrto = asoc->stats.max_obs_rto;
7090 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7091 sizeof(struct sockaddr_storage));
7093 /* Mark beginning of a new observation period */
7094 asoc->stats.max_obs_rto = asoc->rto_min;
7096 if (put_user(len, optlen))
7099 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7101 if (copy_to_user(optval, &sas, len))
7107 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7108 char __user *optval,
7113 if (len < sizeof(int))
7117 if (sctp_sk(sk)->recvrcvinfo)
7119 if (put_user(len, optlen))
7121 if (copy_to_user(optval, &val, len))
7127 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7128 char __user *optval,
7133 if (len < sizeof(int))
7137 if (sctp_sk(sk)->recvnxtinfo)
7139 if (put_user(len, optlen))
7141 if (copy_to_user(optval, &val, len))
7147 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7148 char __user *optval,
7151 struct sctp_assoc_value params;
7152 struct sctp_association *asoc;
7153 int retval = -EFAULT;
7155 if (len < sizeof(params)) {
7160 len = sizeof(params);
7161 if (copy_from_user(¶ms, optval, len))
7164 asoc = sctp_id2assoc(sk, params.assoc_id);
7165 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7166 sctp_style(sk, UDP)) {
7171 params.assoc_value = asoc ? asoc->prsctp_enable
7172 : sctp_sk(sk)->ep->prsctp_enable;
7174 if (put_user(len, optlen))
7177 if (copy_to_user(optval, ¶ms, len))
7186 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7187 char __user *optval,
7190 struct sctp_default_prinfo info;
7191 struct sctp_association *asoc;
7192 int retval = -EFAULT;
7194 if (len < sizeof(info)) {
7200 if (copy_from_user(&info, optval, len))
7203 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7205 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7206 info.pr_value = asoc->default_timetolive;
7207 } else if (!info.pr_assoc_id) {
7208 struct sctp_sock *sp = sctp_sk(sk);
7210 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7211 info.pr_value = sp->default_timetolive;
7217 if (put_user(len, optlen))
7220 if (copy_to_user(optval, &info, len))
7229 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7230 char __user *optval,
7233 struct sctp_prstatus params;
7234 struct sctp_association *asoc;
7236 int retval = -EINVAL;
7238 if (len < sizeof(params))
7241 len = sizeof(params);
7242 if (copy_from_user(¶ms, optval, len)) {
7247 policy = params.sprstat_policy;
7248 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7249 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7252 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7256 if (policy == SCTP_PR_SCTP_ALL) {
7257 params.sprstat_abandoned_unsent = 0;
7258 params.sprstat_abandoned_sent = 0;
7259 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7260 params.sprstat_abandoned_unsent +=
7261 asoc->abandoned_unsent[policy];
7262 params.sprstat_abandoned_sent +=
7263 asoc->abandoned_sent[policy];
7266 params.sprstat_abandoned_unsent =
7267 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7268 params.sprstat_abandoned_sent =
7269 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7272 if (put_user(len, optlen)) {
7277 if (copy_to_user(optval, ¶ms, len)) {
7288 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7289 char __user *optval,
7292 struct sctp_stream_out_ext *streamoute;
7293 struct sctp_association *asoc;
7294 struct sctp_prstatus params;
7295 int retval = -EINVAL;
7298 if (len < sizeof(params))
7301 len = sizeof(params);
7302 if (copy_from_user(¶ms, optval, len)) {
7307 policy = params.sprstat_policy;
7308 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7309 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7312 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7313 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7316 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7318 /* Not allocated yet, means all stats are 0 */
7319 params.sprstat_abandoned_unsent = 0;
7320 params.sprstat_abandoned_sent = 0;
7325 if (policy == SCTP_PR_SCTP_ALL) {
7326 params.sprstat_abandoned_unsent = 0;
7327 params.sprstat_abandoned_sent = 0;
7328 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7329 params.sprstat_abandoned_unsent +=
7330 streamoute->abandoned_unsent[policy];
7331 params.sprstat_abandoned_sent +=
7332 streamoute->abandoned_sent[policy];
7335 params.sprstat_abandoned_unsent =
7336 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7337 params.sprstat_abandoned_sent =
7338 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7341 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7352 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7353 char __user *optval,
7356 struct sctp_assoc_value params;
7357 struct sctp_association *asoc;
7358 int retval = -EFAULT;
7360 if (len < sizeof(params)) {
7365 len = sizeof(params);
7366 if (copy_from_user(¶ms, optval, len))
7369 asoc = sctp_id2assoc(sk, params.assoc_id);
7370 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7371 sctp_style(sk, UDP)) {
7376 params.assoc_value = asoc ? asoc->reconf_enable
7377 : sctp_sk(sk)->ep->reconf_enable;
7379 if (put_user(len, optlen))
7382 if (copy_to_user(optval, ¶ms, len))
7391 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7392 char __user *optval,
7395 struct sctp_assoc_value params;
7396 struct sctp_association *asoc;
7397 int retval = -EFAULT;
7399 if (len < sizeof(params)) {
7404 len = sizeof(params);
7405 if (copy_from_user(¶ms, optval, len))
7408 asoc = sctp_id2assoc(sk, params.assoc_id);
7410 params.assoc_value = asoc->strreset_enable;
7411 } else if (!params.assoc_id) {
7412 struct sctp_sock *sp = sctp_sk(sk);
7414 params.assoc_value = sp->ep->strreset_enable;
7420 if (put_user(len, optlen))
7423 if (copy_to_user(optval, ¶ms, len))
7432 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7433 char __user *optval,
7436 struct sctp_assoc_value params;
7437 struct sctp_association *asoc;
7438 int retval = -EFAULT;
7440 if (len < sizeof(params)) {
7445 len = sizeof(params);
7446 if (copy_from_user(¶ms, optval, len))
7449 asoc = sctp_id2assoc(sk, params.assoc_id);
7455 params.assoc_value = sctp_sched_get_sched(asoc);
7457 if (put_user(len, optlen))
7460 if (copy_to_user(optval, ¶ms, len))
7469 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7470 char __user *optval,
7473 struct sctp_stream_value params;
7474 struct sctp_association *asoc;
7475 int retval = -EFAULT;
7477 if (len < sizeof(params)) {
7482 len = sizeof(params);
7483 if (copy_from_user(¶ms, optval, len))
7486 asoc = sctp_id2assoc(sk, params.assoc_id);
7492 retval = sctp_sched_get_value(asoc, params.stream_id,
7493 ¶ms.stream_value);
7497 if (put_user(len, optlen)) {
7502 if (copy_to_user(optval, ¶ms, len)) {
7511 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7512 char __user *optval,
7515 struct sctp_assoc_value params;
7516 struct sctp_association *asoc;
7517 int retval = -EFAULT;
7519 if (len < sizeof(params)) {
7524 len = sizeof(params);
7525 if (copy_from_user(¶ms, optval, len))
7528 asoc = sctp_id2assoc(sk, params.assoc_id);
7529 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7530 sctp_style(sk, UDP)) {
7535 params.assoc_value = asoc ? asoc->intl_enable
7536 : sctp_sk(sk)->strm_interleave;
7538 if (put_user(len, optlen))
7541 if (copy_to_user(optval, ¶ms, len))
7550 static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7551 char __user *optval,
7556 if (len < sizeof(int))
7560 val = sctp_sk(sk)->reuse;
7561 if (put_user(len, optlen))
7564 if (copy_to_user(optval, &val, len))
7570 static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7573 struct sctp_association *asoc;
7574 struct sctp_event param;
7577 if (len < sizeof(param))
7580 len = sizeof(param);
7581 if (copy_from_user(¶m, optval, len))
7584 if (param.se_type < SCTP_SN_TYPE_BASE ||
7585 param.se_type > SCTP_SN_TYPE_MAX)
7588 asoc = sctp_id2assoc(sk, param.se_assoc_id);
7589 subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7590 param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7592 if (put_user(len, optlen))
7595 if (copy_to_user(optval, ¶m, len))
7601 static int sctp_getsockopt(struct sock *sk, int level, int optname,
7602 char __user *optval, int __user *optlen)
7607 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
7609 /* I can hardly begin to describe how wrong this is. This is
7610 * so broken as to be worse than useless. The API draft
7611 * REALLY is NOT helpful here... I am not convinced that the
7612 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
7613 * are at all well-founded.
7615 if (level != SOL_SCTP) {
7616 struct sctp_af *af = sctp_sk(sk)->pf->af;
7618 retval = af->getsockopt(sk, level, optname, optval, optlen);
7622 if (get_user(len, optlen))
7632 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
7634 case SCTP_DISABLE_FRAGMENTS:
7635 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
7639 retval = sctp_getsockopt_events(sk, len, optval, optlen);
7641 case SCTP_AUTOCLOSE:
7642 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
7644 case SCTP_SOCKOPT_PEELOFF:
7645 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
7647 case SCTP_SOCKOPT_PEELOFF_FLAGS:
7648 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
7650 case SCTP_PEER_ADDR_PARAMS:
7651 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
7654 case SCTP_DELAYED_SACK:
7655 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7659 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
7661 case SCTP_GET_PEER_ADDRS:
7662 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
7665 case SCTP_GET_LOCAL_ADDRS:
7666 retval = sctp_getsockopt_local_addrs(sk, len, optval,
7669 case SCTP_SOCKOPT_CONNECTX3:
7670 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
7672 case SCTP_DEFAULT_SEND_PARAM:
7673 retval = sctp_getsockopt_default_send_param(sk, len,
7676 case SCTP_DEFAULT_SNDINFO:
7677 retval = sctp_getsockopt_default_sndinfo(sk, len,
7680 case SCTP_PRIMARY_ADDR:
7681 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
7684 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
7687 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
7689 case SCTP_ASSOCINFO:
7690 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
7692 case SCTP_I_WANT_MAPPED_V4_ADDR:
7693 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
7696 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
7698 case SCTP_GET_PEER_ADDR_INFO:
7699 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
7702 case SCTP_ADAPTATION_LAYER:
7703 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
7707 retval = sctp_getsockopt_context(sk, len, optval, optlen);
7709 case SCTP_FRAGMENT_INTERLEAVE:
7710 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
7713 case SCTP_PARTIAL_DELIVERY_POINT:
7714 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
7717 case SCTP_MAX_BURST:
7718 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
7721 case SCTP_AUTH_CHUNK:
7722 case SCTP_AUTH_DELETE_KEY:
7723 case SCTP_AUTH_DEACTIVATE_KEY:
7724 retval = -EOPNOTSUPP;
7726 case SCTP_HMAC_IDENT:
7727 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
7729 case SCTP_AUTH_ACTIVE_KEY:
7730 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
7732 case SCTP_PEER_AUTH_CHUNKS:
7733 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
7736 case SCTP_LOCAL_AUTH_CHUNKS:
7737 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
7740 case SCTP_GET_ASSOC_NUMBER:
7741 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
7743 case SCTP_GET_ASSOC_ID_LIST:
7744 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
7746 case SCTP_AUTO_ASCONF:
7747 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
7749 case SCTP_PEER_ADDR_THLDS:
7750 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
7752 case SCTP_GET_ASSOC_STATS:
7753 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
7755 case SCTP_RECVRCVINFO:
7756 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
7758 case SCTP_RECVNXTINFO:
7759 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
7761 case SCTP_PR_SUPPORTED:
7762 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
7764 case SCTP_DEFAULT_PRINFO:
7765 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
7768 case SCTP_PR_ASSOC_STATUS:
7769 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
7772 case SCTP_PR_STREAM_STATUS:
7773 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
7776 case SCTP_RECONFIG_SUPPORTED:
7777 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
7780 case SCTP_ENABLE_STREAM_RESET:
7781 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
7784 case SCTP_STREAM_SCHEDULER:
7785 retval = sctp_getsockopt_scheduler(sk, len, optval,
7788 case SCTP_STREAM_SCHEDULER_VALUE:
7789 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
7792 case SCTP_INTERLEAVING_SUPPORTED:
7793 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
7796 case SCTP_REUSE_PORT:
7797 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
7800 retval = sctp_getsockopt_event(sk, len, optval, optlen);
7803 retval = -ENOPROTOOPT;
7811 static int sctp_hash(struct sock *sk)
7817 static void sctp_unhash(struct sock *sk)
7822 /* Check if port is acceptable. Possibly find first available port.
7824 * The port hash table (contained in the 'global' SCTP protocol storage
7825 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
7826 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
7827 * list (the list number is the port number hashed out, so as you
7828 * would expect from a hash function, all the ports in a given list have
7829 * such a number that hashes out to the same list number; you were
7830 * expecting that, right?); so each list has a set of ports, with a
7831 * link to the socket (struct sock) that uses it, the port number and
7832 * a fastreuse flag (FIXME: NPI ipg).
7834 static struct sctp_bind_bucket *sctp_bucket_create(
7835 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
7837 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
7839 struct sctp_sock *sp = sctp_sk(sk);
7840 bool reuse = (sk->sk_reuse || sp->reuse);
7841 struct sctp_bind_hashbucket *head; /* hash list */
7842 kuid_t uid = sock_i_uid(sk);
7843 struct sctp_bind_bucket *pp;
7844 unsigned short snum;
7847 snum = ntohs(addr->v4.sin_port);
7849 pr_debug("%s: begins, snum:%d\n", __func__, snum);
7854 /* Search for an available port. */
7855 int low, high, remaining, index;
7857 struct net *net = sock_net(sk);
7859 inet_get_local_port_range(net, &low, &high);
7860 remaining = (high - low) + 1;
7861 rover = prandom_u32() % remaining + low;
7865 if ((rover < low) || (rover > high))
7867 if (inet_is_local_reserved_port(net, rover))
7869 index = sctp_phashfn(sock_net(sk), rover);
7870 head = &sctp_port_hashtable[index];
7871 spin_lock(&head->lock);
7872 sctp_for_each_hentry(pp, &head->chain)
7873 if ((pp->port == rover) &&
7874 net_eq(sock_net(sk), pp->net))
7878 spin_unlock(&head->lock);
7879 } while (--remaining > 0);
7881 /* Exhausted local port range during search? */
7886 /* OK, here is the one we will use. HEAD (the port
7887 * hash table list entry) is non-NULL and we hold it's
7892 /* We are given an specific port number; we verify
7893 * that it is not being used. If it is used, we will
7894 * exahust the search in the hash list corresponding
7895 * to the port number (snum) - we detect that with the
7896 * port iterator, pp being NULL.
7898 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
7899 spin_lock(&head->lock);
7900 sctp_for_each_hentry(pp, &head->chain) {
7901 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
7908 if (!hlist_empty(&pp->owner)) {
7909 /* We had a port hash table hit - there is an
7910 * available port (pp != NULL) and it is being
7911 * used by other socket (pp->owner not empty); that other
7912 * socket is going to be sk2.
7916 pr_debug("%s: found a possible match\n", __func__);
7918 if ((pp->fastreuse && reuse &&
7919 sk->sk_state != SCTP_SS_LISTENING) ||
7920 (pp->fastreuseport && sk->sk_reuseport &&
7921 uid_eq(pp->fastuid, uid)))
7924 /* Run through the list of sockets bound to the port
7925 * (pp->port) [via the pointers bind_next and
7926 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
7927 * we get the endpoint they describe and run through
7928 * the endpoint's list of IP (v4 or v6) addresses,
7929 * comparing each of the addresses with the address of
7930 * the socket sk. If we find a match, then that means
7931 * that this port/socket (sk) combination are already
7934 sk_for_each_bound(sk2, &pp->owner) {
7935 struct sctp_sock *sp2 = sctp_sk(sk2);
7936 struct sctp_endpoint *ep2 = sp2->ep;
7939 (reuse && (sk2->sk_reuse || sp2->reuse) &&
7940 sk2->sk_state != SCTP_SS_LISTENING) ||
7941 (sk->sk_reuseport && sk2->sk_reuseport &&
7942 uid_eq(uid, sock_i_uid(sk2))))
7945 if (sctp_bind_addr_conflict(&ep2->base.bind_addr,
7952 pr_debug("%s: found a match\n", __func__);
7955 /* If there was a hash table miss, create a new port. */
7957 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
7960 /* In either case (hit or miss), make sure fastreuse is 1 only
7961 * if sk->sk_reuse is too (that is, if the caller requested
7962 * SO_REUSEADDR on this socket -sk-).
7964 if (hlist_empty(&pp->owner)) {
7965 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
7970 if (sk->sk_reuseport) {
7971 pp->fastreuseport = 1;
7974 pp->fastreuseport = 0;
7977 if (pp->fastreuse &&
7978 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
7981 if (pp->fastreuseport &&
7982 (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
7983 pp->fastreuseport = 0;
7986 /* We are set, so fill up all the data in the hash table
7987 * entry, tie the socket list information with the rest of the
7988 * sockets FIXME: Blurry, NPI (ipg).
7991 if (!sp->bind_hash) {
7992 inet_sk(sk)->inet_num = snum;
7993 sk_add_bind_node(sk, &pp->owner);
7999 spin_unlock(&head->lock);
8006 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8007 * port is requested.
8009 static int sctp_get_port(struct sock *sk, unsigned short snum)
8011 union sctp_addr addr;
8012 struct sctp_af *af = sctp_sk(sk)->pf->af;
8014 /* Set up a dummy address struct from the sk. */
8015 af->from_sk(&addr, sk);
8016 addr.v4.sin_port = htons(snum);
8018 /* Note: sk->sk_num gets filled in if ephemeral port request. */
8019 return !!sctp_get_port_local(sk, &addr);
8023 * Move a socket to LISTENING state.
8025 static int sctp_listen_start(struct sock *sk, int backlog)
8027 struct sctp_sock *sp = sctp_sk(sk);
8028 struct sctp_endpoint *ep = sp->ep;
8029 struct crypto_shash *tfm = NULL;
8032 /* Allocate HMAC for generating cookie. */
8033 if (!sp->hmac && sp->sctp_hmac_alg) {
8034 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8035 tfm = crypto_alloc_shash(alg, 0, 0);
8037 net_info_ratelimited("failed to load transform for %s: %ld\n",
8038 sp->sctp_hmac_alg, PTR_ERR(tfm));
8041 sctp_sk(sk)->hmac = tfm;
8045 * If a bind() or sctp_bindx() is not called prior to a listen()
8046 * call that allows new associations to be accepted, the system
8047 * picks an ephemeral port and will choose an address set equivalent
8048 * to binding with a wildcard address.
8050 * This is not currently spelled out in the SCTP sockets
8051 * extensions draft, but follows the practice as seen in TCP
8055 inet_sk_set_state(sk, SCTP_SS_LISTENING);
8056 if (!ep->base.bind_addr.port) {
8057 if (sctp_autobind(sk))
8060 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8061 inet_sk_set_state(sk, SCTP_SS_CLOSED);
8066 sk->sk_max_ack_backlog = backlog;
8067 return sctp_hash_endpoint(ep);
8071 * 4.1.3 / 5.1.3 listen()
8073 * By default, new associations are not accepted for UDP style sockets.
8074 * An application uses listen() to mark a socket as being able to
8075 * accept new associations.
8077 * On TCP style sockets, applications use listen() to ready the SCTP
8078 * endpoint for accepting inbound associations.
8080 * On both types of endpoints a backlog of '0' disables listening.
8082 * Move a socket to LISTENING state.
8084 int sctp_inet_listen(struct socket *sock, int backlog)
8086 struct sock *sk = sock->sk;
8087 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8090 if (unlikely(backlog < 0))
8095 /* Peeled-off sockets are not allowed to listen(). */
8096 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8099 if (sock->state != SS_UNCONNECTED)
8102 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8105 /* If backlog is zero, disable listening. */
8107 if (sctp_sstate(sk, CLOSED))
8111 sctp_unhash_endpoint(ep);
8112 sk->sk_state = SCTP_SS_CLOSED;
8113 if (sk->sk_reuse || sctp_sk(sk)->reuse)
8114 sctp_sk(sk)->bind_hash->fastreuse = 1;
8118 /* If we are already listening, just update the backlog */
8119 if (sctp_sstate(sk, LISTENING))
8120 sk->sk_max_ack_backlog = backlog;
8122 err = sctp_listen_start(sk, backlog);
8134 * This function is done by modeling the current datagram_poll() and the
8135 * tcp_poll(). Note that, based on these implementations, we don't
8136 * lock the socket in this function, even though it seems that,
8137 * ideally, locking or some other mechanisms can be used to ensure
8138 * the integrity of the counters (sndbuf and wmem_alloc) used
8139 * in this place. We assume that we don't need locks either until proven
8142 * Another thing to note is that we include the Async I/O support
8143 * here, again, by modeling the current TCP/UDP code. We don't have
8144 * a good way to test with it yet.
8146 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8148 struct sock *sk = sock->sk;
8149 struct sctp_sock *sp = sctp_sk(sk);
8152 poll_wait(file, sk_sleep(sk), wait);
8154 sock_rps_record_flow(sk);
8156 /* A TCP-style listening socket becomes readable when the accept queue
8159 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8160 return (!list_empty(&sp->ep->asocs)) ?
8161 (EPOLLIN | EPOLLRDNORM) : 0;
8165 /* Is there any exceptional events? */
8166 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
8168 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8169 if (sk->sk_shutdown & RCV_SHUTDOWN)
8170 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8171 if (sk->sk_shutdown == SHUTDOWN_MASK)
8174 /* Is it readable? Reconsider this code with TCP-style support. */
8175 if (!skb_queue_empty(&sk->sk_receive_queue))
8176 mask |= EPOLLIN | EPOLLRDNORM;
8178 /* The association is either gone or not ready. */
8179 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8182 /* Is it writable? */
8183 if (sctp_writeable(sk)) {
8184 mask |= EPOLLOUT | EPOLLWRNORM;
8186 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8188 * Since the socket is not locked, the buffer
8189 * might be made available after the writeable check and
8190 * before the bit is set. This could cause a lost I/O
8191 * signal. tcp_poll() has a race breaker for this race
8192 * condition. Based on their implementation, we put
8193 * in the following code to cover it as well.
8195 if (sctp_writeable(sk))
8196 mask |= EPOLLOUT | EPOLLWRNORM;
8201 /********************************************************************
8202 * 2nd Level Abstractions
8203 ********************************************************************/
8205 static struct sctp_bind_bucket *sctp_bucket_create(
8206 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8208 struct sctp_bind_bucket *pp;
8210 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8212 SCTP_DBG_OBJCNT_INC(bind_bucket);
8215 INIT_HLIST_HEAD(&pp->owner);
8217 hlist_add_head(&pp->node, &head->chain);
8222 /* Caller must hold hashbucket lock for this tb with local BH disabled */
8223 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8225 if (pp && hlist_empty(&pp->owner)) {
8226 __hlist_del(&pp->node);
8227 kmem_cache_free(sctp_bucket_cachep, pp);
8228 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8232 /* Release this socket's reference to a local port. */
8233 static inline void __sctp_put_port(struct sock *sk)
8235 struct sctp_bind_hashbucket *head =
8236 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8237 inet_sk(sk)->inet_num)];
8238 struct sctp_bind_bucket *pp;
8240 spin_lock(&head->lock);
8241 pp = sctp_sk(sk)->bind_hash;
8242 __sk_del_bind_node(sk);
8243 sctp_sk(sk)->bind_hash = NULL;
8244 inet_sk(sk)->inet_num = 0;
8245 sctp_bucket_destroy(pp);
8246 spin_unlock(&head->lock);
8249 void sctp_put_port(struct sock *sk)
8252 __sctp_put_port(sk);
8257 * The system picks an ephemeral port and choose an address set equivalent
8258 * to binding with a wildcard address.
8259 * One of those addresses will be the primary address for the association.
8260 * This automatically enables the multihoming capability of SCTP.
8262 static int sctp_autobind(struct sock *sk)
8264 union sctp_addr autoaddr;
8268 /* Initialize a local sockaddr structure to INADDR_ANY. */
8269 af = sctp_sk(sk)->pf->af;
8271 port = htons(inet_sk(sk)->inet_num);
8272 af->inaddr_any(&autoaddr, port);
8274 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8277 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8280 * 4.2 The cmsghdr Structure *
8282 * When ancillary data is sent or received, any number of ancillary data
8283 * objects can be specified by the msg_control and msg_controllen members of
8284 * the msghdr structure, because each object is preceded by
8285 * a cmsghdr structure defining the object's length (the cmsg_len member).
8286 * Historically Berkeley-derived implementations have passed only one object
8287 * at a time, but this API allows multiple objects to be
8288 * passed in a single call to sendmsg() or recvmsg(). The following example
8289 * shows two ancillary data objects in a control buffer.
8291 * |<--------------------------- msg_controllen -------------------------->|
8294 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8296 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8299 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8301 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8304 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8305 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8307 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8309 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8316 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8318 struct msghdr *my_msg = (struct msghdr *)msg;
8319 struct cmsghdr *cmsg;
8321 for_each_cmsghdr(cmsg, my_msg) {
8322 if (!CMSG_OK(my_msg, cmsg))
8325 /* Should we parse this header or ignore? */
8326 if (cmsg->cmsg_level != IPPROTO_SCTP)
8329 /* Strictly check lengths following example in SCM code. */
8330 switch (cmsg->cmsg_type) {
8332 /* SCTP Socket API Extension
8333 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8335 * This cmsghdr structure provides information for
8336 * initializing new SCTP associations with sendmsg().
8337 * The SCTP_INITMSG socket option uses this same data
8338 * structure. This structure is not used for
8341 * cmsg_level cmsg_type cmsg_data[]
8342 * ------------ ------------ ----------------------
8343 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8345 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8348 cmsgs->init = CMSG_DATA(cmsg);
8352 /* SCTP Socket API Extension
8353 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8355 * This cmsghdr structure specifies SCTP options for
8356 * sendmsg() and describes SCTP header information
8357 * about a received message through recvmsg().
8359 * cmsg_level cmsg_type cmsg_data[]
8360 * ------------ ------------ ----------------------
8361 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8363 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8366 cmsgs->srinfo = CMSG_DATA(cmsg);
8368 if (cmsgs->srinfo->sinfo_flags &
8369 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8370 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8371 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8376 /* SCTP Socket API Extension
8377 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8379 * This cmsghdr structure specifies SCTP options for
8380 * sendmsg(). This structure and SCTP_RCVINFO replaces
8381 * SCTP_SNDRCV which has been deprecated.
8383 * cmsg_level cmsg_type cmsg_data[]
8384 * ------------ ------------ ---------------------
8385 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8387 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8390 cmsgs->sinfo = CMSG_DATA(cmsg);
8392 if (cmsgs->sinfo->snd_flags &
8393 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8394 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8395 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8399 /* SCTP Socket API Extension
8400 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8402 * This cmsghdr structure specifies SCTP options for sendmsg().
8404 * cmsg_level cmsg_type cmsg_data[]
8405 * ------------ ------------ ---------------------
8406 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8408 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8411 cmsgs->prinfo = CMSG_DATA(cmsg);
8412 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8415 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8416 cmsgs->prinfo->pr_value = 0;
8419 /* SCTP Socket API Extension
8420 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8422 * This cmsghdr structure specifies SCTP options for sendmsg().
8424 * cmsg_level cmsg_type cmsg_data[]
8425 * ------------ ------------ ---------------------
8426 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8428 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8431 cmsgs->authinfo = CMSG_DATA(cmsg);
8433 case SCTP_DSTADDRV4:
8434 case SCTP_DSTADDRV6:
8435 /* SCTP Socket API Extension
8436 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8438 * This cmsghdr structure specifies SCTP options for sendmsg().
8440 * cmsg_level cmsg_type cmsg_data[]
8441 * ------------ ------------ ---------------------
8442 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8443 * ------------ ------------ ---------------------
8444 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8446 cmsgs->addrs_msg = my_msg;
8457 * Wait for a packet..
8458 * Note: This function is the same function as in core/datagram.c
8459 * with a few modifications to make lksctp work.
8461 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8466 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8468 /* Socket errors? */
8469 error = sock_error(sk);
8473 if (!skb_queue_empty(&sk->sk_receive_queue))
8476 /* Socket shut down? */
8477 if (sk->sk_shutdown & RCV_SHUTDOWN)
8480 /* Sequenced packets can come disconnected. If so we report the
8485 /* Is there a good reason to think that we may receive some data? */
8486 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8489 /* Handle signals. */
8490 if (signal_pending(current))
8493 /* Let another process have a go. Since we are going to sleep
8494 * anyway. Note: This may cause odd behaviors if the message
8495 * does not fit in the user's buffer, but this seems to be the
8496 * only way to honor MSG_DONTWAIT realistically.
8499 *timeo_p = schedule_timeout(*timeo_p);
8503 finish_wait(sk_sleep(sk), &wait);
8507 error = sock_intr_errno(*timeo_p);
8510 finish_wait(sk_sleep(sk), &wait);
8515 /* Receive a datagram.
8516 * Note: This is pretty much the same routine as in core/datagram.c
8517 * with a few changes to make lksctp work.
8519 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
8520 int noblock, int *err)
8523 struct sk_buff *skb;
8526 timeo = sock_rcvtimeo(sk, noblock);
8528 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8529 MAX_SCHEDULE_TIMEOUT);
8532 /* Again only user level code calls this function,
8533 * so nothing interrupt level
8534 * will suddenly eat the receive_queue.
8536 * Look at current nfs client by the way...
8537 * However, this function was correct in any case. 8)
8539 if (flags & MSG_PEEK) {
8540 skb = skb_peek(&sk->sk_receive_queue);
8542 refcount_inc(&skb->users);
8544 skb = __skb_dequeue(&sk->sk_receive_queue);
8550 /* Caller is allowed not to check sk->sk_err before calling. */
8551 error = sock_error(sk);
8555 if (sk->sk_shutdown & RCV_SHUTDOWN)
8558 if (sk_can_busy_loop(sk)) {
8559 sk_busy_loop(sk, noblock);
8561 if (!skb_queue_empty(&sk->sk_receive_queue))
8565 /* User doesn't want to wait. */
8569 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
8578 /* If sndbuf has changed, wake up per association sndbuf waiters. */
8579 static void __sctp_write_space(struct sctp_association *asoc)
8581 struct sock *sk = asoc->base.sk;
8583 if (sctp_wspace(asoc) <= 0)
8586 if (waitqueue_active(&asoc->wait))
8587 wake_up_interruptible(&asoc->wait);
8589 if (sctp_writeable(sk)) {
8590 struct socket_wq *wq;
8593 wq = rcu_dereference(sk->sk_wq);
8595 if (waitqueue_active(&wq->wait))
8596 wake_up_interruptible(&wq->wait);
8598 /* Note that we try to include the Async I/O support
8599 * here by modeling from the current TCP/UDP code.
8600 * We have not tested with it yet.
8602 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
8603 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
8609 static void sctp_wake_up_waiters(struct sock *sk,
8610 struct sctp_association *asoc)
8612 struct sctp_association *tmp = asoc;
8614 /* We do accounting for the sndbuf space per association,
8615 * so we only need to wake our own association.
8617 if (asoc->ep->sndbuf_policy)
8618 return __sctp_write_space(asoc);
8620 /* If association goes down and is just flushing its
8621 * outq, then just normally notify others.
8623 if (asoc->base.dead)
8624 return sctp_write_space(sk);
8626 /* Accounting for the sndbuf space is per socket, so we
8627 * need to wake up others, try to be fair and in case of
8628 * other associations, let them have a go first instead
8629 * of just doing a sctp_write_space() call.
8631 * Note that we reach sctp_wake_up_waiters() only when
8632 * associations free up queued chunks, thus we are under
8633 * lock and the list of associations on a socket is
8634 * guaranteed not to change.
8636 for (tmp = list_next_entry(tmp, asocs); 1;
8637 tmp = list_next_entry(tmp, asocs)) {
8638 /* Manually skip the head element. */
8639 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
8641 /* Wake up association. */
8642 __sctp_write_space(tmp);
8643 /* We've reached the end. */
8649 /* Do accounting for the sndbuf space.
8650 * Decrement the used sndbuf space of the corresponding association by the
8651 * data size which was just transmitted(freed).
8653 static void sctp_wfree(struct sk_buff *skb)
8655 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
8656 struct sctp_association *asoc = chunk->asoc;
8657 struct sock *sk = asoc->base.sk;
8659 sk_mem_uncharge(sk, skb->truesize);
8660 sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
8661 asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
8662 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
8663 &sk->sk_wmem_alloc));
8666 struct sctp_shared_key *shkey = chunk->shkey;
8668 /* refcnt == 2 and !list_empty mean after this release, it's
8669 * not being used anywhere, and it's time to notify userland
8670 * that this shkey can be freed if it's been deactivated.
8672 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
8673 refcount_read(&shkey->refcnt) == 2) {
8674 struct sctp_ulpevent *ev;
8676 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
8680 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
8682 sctp_auth_shkey_release(chunk->shkey);
8686 sctp_wake_up_waiters(sk, asoc);
8688 sctp_association_put(asoc);
8691 /* Do accounting for the receive space on the socket.
8692 * Accounting for the association is done in ulpevent.c
8693 * We set this as a destructor for the cloned data skbs so that
8694 * accounting is done at the correct time.
8696 void sctp_sock_rfree(struct sk_buff *skb)
8698 struct sock *sk = skb->sk;
8699 struct sctp_ulpevent *event = sctp_skb2event(skb);
8701 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
8704 * Mimic the behavior of sock_rfree
8706 sk_mem_uncharge(sk, event->rmem_len);
8710 /* Helper function to wait for space in the sndbuf. */
8711 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
8714 struct sock *sk = asoc->base.sk;
8715 long current_timeo = *timeo_p;
8719 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
8722 /* Increment the association's refcnt. */
8723 sctp_association_hold(asoc);
8725 /* Wait on the association specific sndbuf space. */
8727 prepare_to_wait_exclusive(&asoc->wait, &wait,
8728 TASK_INTERRUPTIBLE);
8729 if (asoc->base.dead)
8733 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
8735 if (signal_pending(current))
8736 goto do_interrupted;
8737 if ((int)msg_len <= sctp_wspace(asoc))
8740 /* Let another process have a go. Since we are going
8744 current_timeo = schedule_timeout(current_timeo);
8746 if (sk != asoc->base.sk)
8749 *timeo_p = current_timeo;
8753 finish_wait(&asoc->wait, &wait);
8755 /* Release the association's refcnt. */
8756 sctp_association_put(asoc);
8769 err = sock_intr_errno(*timeo_p);
8777 void sctp_data_ready(struct sock *sk)
8779 struct socket_wq *wq;
8782 wq = rcu_dereference(sk->sk_wq);
8783 if (skwq_has_sleeper(wq))
8784 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
8785 EPOLLRDNORM | EPOLLRDBAND);
8786 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
8790 /* If socket sndbuf has changed, wake up all per association waiters. */
8791 void sctp_write_space(struct sock *sk)
8793 struct sctp_association *asoc;
8795 /* Wake up the tasks in each wait queue. */
8796 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
8797 __sctp_write_space(asoc);
8801 /* Is there any sndbuf space available on the socket?
8803 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
8804 * associations on the same socket. For a UDP-style socket with
8805 * multiple associations, it is possible for it to be "unwriteable"
8806 * prematurely. I assume that this is acceptable because
8807 * a premature "unwriteable" is better than an accidental "writeable" which
8808 * would cause an unwanted block under certain circumstances. For the 1-1
8809 * UDP-style sockets or TCP-style sockets, this code should work.
8812 static bool sctp_writeable(struct sock *sk)
8814 return sk->sk_sndbuf > sk->sk_wmem_queued;
8817 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
8818 * returns immediately with EINPROGRESS.
8820 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
8822 struct sock *sk = asoc->base.sk;
8824 long current_timeo = *timeo_p;
8827 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
8829 /* Increment the association's refcnt. */
8830 sctp_association_hold(asoc);
8833 prepare_to_wait_exclusive(&asoc->wait, &wait,
8834 TASK_INTERRUPTIBLE);
8837 if (sk->sk_shutdown & RCV_SHUTDOWN)
8839 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
8842 if (signal_pending(current))
8843 goto do_interrupted;
8845 if (sctp_state(asoc, ESTABLISHED))
8848 /* Let another process have a go. Since we are going
8852 current_timeo = schedule_timeout(current_timeo);
8855 *timeo_p = current_timeo;
8859 finish_wait(&asoc->wait, &wait);
8861 /* Release the association's refcnt. */
8862 sctp_association_put(asoc);
8867 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
8870 err = -ECONNREFUSED;
8874 err = sock_intr_errno(*timeo_p);
8882 static int sctp_wait_for_accept(struct sock *sk, long timeo)
8884 struct sctp_endpoint *ep;
8888 ep = sctp_sk(sk)->ep;
8892 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
8893 TASK_INTERRUPTIBLE);
8895 if (list_empty(&ep->asocs)) {
8897 timeo = schedule_timeout(timeo);
8902 if (!sctp_sstate(sk, LISTENING))
8906 if (!list_empty(&ep->asocs))
8909 err = sock_intr_errno(timeo);
8910 if (signal_pending(current))
8918 finish_wait(sk_sleep(sk), &wait);
8923 static void sctp_wait_for_close(struct sock *sk, long timeout)
8928 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8929 if (list_empty(&sctp_sk(sk)->ep->asocs))
8932 timeout = schedule_timeout(timeout);
8934 } while (!signal_pending(current) && timeout);
8936 finish_wait(sk_sleep(sk), &wait);
8939 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
8941 struct sk_buff *frag;
8946 /* Don't forget the fragments. */
8947 skb_walk_frags(skb, frag)
8948 sctp_skb_set_owner_r_frag(frag, sk);
8951 sctp_skb_set_owner_r(skb, sk);
8954 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
8955 struct sctp_association *asoc)
8957 struct inet_sock *inet = inet_sk(sk);
8958 struct inet_sock *newinet;
8959 struct sctp_sock *sp = sctp_sk(sk);
8960 struct sctp_endpoint *ep = sp->ep;
8962 newsk->sk_type = sk->sk_type;
8963 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
8964 newsk->sk_flags = sk->sk_flags;
8965 newsk->sk_tsflags = sk->sk_tsflags;
8966 newsk->sk_no_check_tx = sk->sk_no_check_tx;
8967 newsk->sk_no_check_rx = sk->sk_no_check_rx;
8968 newsk->sk_reuse = sk->sk_reuse;
8969 sctp_sk(newsk)->reuse = sp->reuse;
8971 newsk->sk_shutdown = sk->sk_shutdown;
8972 newsk->sk_destruct = sctp_destruct_sock;
8973 newsk->sk_family = sk->sk_family;
8974 newsk->sk_protocol = IPPROTO_SCTP;
8975 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
8976 newsk->sk_sndbuf = sk->sk_sndbuf;
8977 newsk->sk_rcvbuf = sk->sk_rcvbuf;
8978 newsk->sk_lingertime = sk->sk_lingertime;
8979 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
8980 newsk->sk_sndtimeo = sk->sk_sndtimeo;
8981 newsk->sk_rxhash = sk->sk_rxhash;
8983 newinet = inet_sk(newsk);
8985 /* Initialize sk's sport, dport, rcv_saddr and daddr for
8986 * getsockname() and getpeername()
8988 newinet->inet_sport = inet->inet_sport;
8989 newinet->inet_saddr = inet->inet_saddr;
8990 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
8991 newinet->inet_dport = htons(asoc->peer.port);
8992 newinet->pmtudisc = inet->pmtudisc;
8993 newinet->inet_id = asoc->next_tsn ^ jiffies;
8995 newinet->uc_ttl = inet->uc_ttl;
8996 newinet->mc_loop = 1;
8997 newinet->mc_ttl = 1;
8998 newinet->mc_index = 0;
8999 newinet->mc_list = NULL;
9001 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9002 net_enable_timestamp();
9004 /* Set newsk security attributes from orginal sk and connection
9005 * security attribute from ep.
9007 security_sctp_sk_clone(ep, sk, newsk);
9010 static inline void sctp_copy_descendant(struct sock *sk_to,
9011 const struct sock *sk_from)
9013 int ancestor_size = sizeof(struct inet_sock) +
9014 sizeof(struct sctp_sock) -
9015 offsetof(struct sctp_sock, auto_asconf_list);
9017 if (sk_from->sk_family == PF_INET6)
9018 ancestor_size += sizeof(struct ipv6_pinfo);
9020 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9023 /* Populate the fields of the newsk from the oldsk and migrate the assoc
9024 * and its messages to the newsk.
9026 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9027 struct sctp_association *assoc,
9028 enum sctp_socket_type type)
9030 struct sctp_sock *oldsp = sctp_sk(oldsk);
9031 struct sctp_sock *newsp = sctp_sk(newsk);
9032 struct sctp_bind_bucket *pp; /* hash list port iterator */
9033 struct sctp_endpoint *newep = newsp->ep;
9034 struct sk_buff *skb, *tmp;
9035 struct sctp_ulpevent *event;
9036 struct sctp_bind_hashbucket *head;
9038 /* Migrate socket buffer sizes and all the socket level options to the
9041 newsk->sk_sndbuf = oldsk->sk_sndbuf;
9042 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9043 /* Brute force copy old sctp opt. */
9044 sctp_copy_descendant(newsk, oldsk);
9046 /* Restore the ep value that was overwritten with the above structure
9052 /* Hook this new socket in to the bind_hash list. */
9053 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9054 inet_sk(oldsk)->inet_num)];
9055 spin_lock_bh(&head->lock);
9056 pp = sctp_sk(oldsk)->bind_hash;
9057 sk_add_bind_node(newsk, &pp->owner);
9058 sctp_sk(newsk)->bind_hash = pp;
9059 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9060 spin_unlock_bh(&head->lock);
9062 /* Copy the bind_addr list from the original endpoint to the new
9063 * endpoint so that we can handle restarts properly
9065 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9066 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9068 /* Move any messages in the old socket's receive queue that are for the
9069 * peeled off association to the new socket's receive queue.
9071 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9072 event = sctp_skb2event(skb);
9073 if (event->asoc == assoc) {
9074 __skb_unlink(skb, &oldsk->sk_receive_queue);
9075 __skb_queue_tail(&newsk->sk_receive_queue, skb);
9076 sctp_skb_set_owner_r_frag(skb, newsk);
9080 /* Clean up any messages pending delivery due to partial
9081 * delivery. Three cases:
9082 * 1) No partial deliver; no work.
9083 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9084 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9086 skb_queue_head_init(&newsp->pd_lobby);
9087 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9089 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9090 struct sk_buff_head *queue;
9092 /* Decide which queue to move pd_lobby skbs to. */
9093 if (assoc->ulpq.pd_mode) {
9094 queue = &newsp->pd_lobby;
9096 queue = &newsk->sk_receive_queue;
9098 /* Walk through the pd_lobby, looking for skbs that
9099 * need moved to the new socket.
9101 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9102 event = sctp_skb2event(skb);
9103 if (event->asoc == assoc) {
9104 __skb_unlink(skb, &oldsp->pd_lobby);
9105 __skb_queue_tail(queue, skb);
9106 sctp_skb_set_owner_r_frag(skb, newsk);
9110 /* Clear up any skbs waiting for the partial
9111 * delivery to finish.
9113 if (assoc->ulpq.pd_mode)
9114 sctp_clear_pd(oldsk, NULL);
9118 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9120 /* Set the type of socket to indicate that it is peeled off from the
9121 * original UDP-style socket or created with the accept() call on a
9122 * TCP-style socket..
9126 /* Mark the new socket "in-use" by the user so that any packets
9127 * that may arrive on the association after we've moved it are
9128 * queued to the backlog. This prevents a potential race between
9129 * backlog processing on the old socket and new-packet processing
9130 * on the new socket.
9132 * The caller has just allocated newsk so we can guarantee that other
9133 * paths won't try to lock it and then oldsk.
9135 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9136 sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
9137 sctp_assoc_migrate(assoc, newsk);
9138 sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
9140 /* If the association on the newsk is already closed before accept()
9141 * is called, set RCV_SHUTDOWN flag.
9143 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9144 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9145 newsk->sk_shutdown |= RCV_SHUTDOWN;
9147 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9150 release_sock(newsk);
9154 /* This proto struct describes the ULP interface for SCTP. */
9155 struct proto sctp_prot = {
9157 .owner = THIS_MODULE,
9158 .close = sctp_close,
9159 .disconnect = sctp_disconnect,
9160 .accept = sctp_accept,
9161 .ioctl = sctp_ioctl,
9162 .init = sctp_init_sock,
9163 .destroy = sctp_destroy_sock,
9164 .shutdown = sctp_shutdown,
9165 .setsockopt = sctp_setsockopt,
9166 .getsockopt = sctp_getsockopt,
9167 .sendmsg = sctp_sendmsg,
9168 .recvmsg = sctp_recvmsg,
9170 .backlog_rcv = sctp_backlog_rcv,
9172 .unhash = sctp_unhash,
9173 .get_port = sctp_get_port,
9174 .obj_size = sizeof(struct sctp_sock),
9175 .useroffset = offsetof(struct sctp_sock, subscribe),
9176 .usersize = offsetof(struct sctp_sock, initmsg) -
9177 offsetof(struct sctp_sock, subscribe) +
9178 sizeof_field(struct sctp_sock, initmsg),
9179 .sysctl_mem = sysctl_sctp_mem,
9180 .sysctl_rmem = sysctl_sctp_rmem,
9181 .sysctl_wmem = sysctl_sctp_wmem,
9182 .memory_pressure = &sctp_memory_pressure,
9183 .enter_memory_pressure = sctp_enter_memory_pressure,
9184 .memory_allocated = &sctp_memory_allocated,
9185 .sockets_allocated = &sctp_sockets_allocated,
9188 #if IS_ENABLED(CONFIG_IPV6)
9190 #include <net/transp_v6.h>
9191 static void sctp_v6_destroy_sock(struct sock *sk)
9193 sctp_destroy_sock(sk);
9194 inet6_destroy_sock(sk);
9197 struct proto sctpv6_prot = {
9199 .owner = THIS_MODULE,
9200 .close = sctp_close,
9201 .disconnect = sctp_disconnect,
9202 .accept = sctp_accept,
9203 .ioctl = sctp_ioctl,
9204 .init = sctp_init_sock,
9205 .destroy = sctp_v6_destroy_sock,
9206 .shutdown = sctp_shutdown,
9207 .setsockopt = sctp_setsockopt,
9208 .getsockopt = sctp_getsockopt,
9209 .sendmsg = sctp_sendmsg,
9210 .recvmsg = sctp_recvmsg,
9212 .backlog_rcv = sctp_backlog_rcv,
9214 .unhash = sctp_unhash,
9215 .get_port = sctp_get_port,
9216 .obj_size = sizeof(struct sctp6_sock),
9217 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9218 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9219 offsetof(struct sctp6_sock, sctp.subscribe) +
9220 sizeof_field(struct sctp6_sock, sctp.initmsg),
9221 .sysctl_mem = sysctl_sctp_mem,
9222 .sysctl_rmem = sysctl_sctp_rmem,
9223 .sysctl_wmem = sysctl_sctp_wmem,
9224 .memory_pressure = &sctp_memory_pressure,
9225 .enter_memory_pressure = sctp_enter_memory_pressure,
9226 .memory_allocated = &sctp_memory_allocated,
9227 .sockets_allocated = &sctp_sockets_allocated,
9229 #endif /* IS_ENABLED(CONFIG_IPV6) */