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>
61 #include <linux/capability.h>
62 #include <linux/fcntl.h>
63 #include <linux/poll.h>
64 #include <linux/init.h>
65 #include <linux/slab.h>
66 #include <linux/file.h>
67 #include <linux/compat.h>
71 #include <net/route.h>
73 #include <net/inet_common.h>
74 #include <net/busy_poll.h>
76 #include <linux/socket.h> /* for sa_family_t */
77 #include <linux/export.h>
79 #include <net/sctp/sctp.h>
80 #include <net/sctp/sm.h>
82 /* Forward declarations for internal helper functions. */
83 static int sctp_writeable(struct sock
*sk
);
84 static void sctp_wfree(struct sk_buff
*skb
);
85 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
87 static int sctp_wait_for_packet(struct sock
*sk
, int *err
, long *timeo_p
);
88 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
89 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
90 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
91 static void sctp_destruct_sock(struct sock
*sk
);
92 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
93 union sctp_addr
*addr
, int len
);
94 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
95 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
96 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
97 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
98 static int sctp_send_asconf(struct sctp_association
*asoc
,
99 struct sctp_chunk
*chunk
);
100 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
101 static int sctp_autobind(struct sock
*sk
);
102 static void sctp_sock_migrate(struct sock
*, struct sock
*,
103 struct sctp_association
*, sctp_socket_type_t
);
105 static int sctp_memory_pressure
;
106 static atomic_long_t sctp_memory_allocated
;
107 struct percpu_counter sctp_sockets_allocated
;
109 static void sctp_enter_memory_pressure(struct sock
*sk
)
111 sctp_memory_pressure
= 1;
115 /* Get the sndbuf space available at the time on the association. */
116 static inline int sctp_wspace(struct sctp_association
*asoc
)
120 if (asoc
->ep
->sndbuf_policy
)
121 amt
= asoc
->sndbuf_used
;
123 amt
= sk_wmem_alloc_get(asoc
->base
.sk
);
125 if (amt
>= asoc
->base
.sk
->sk_sndbuf
) {
126 if (asoc
->base
.sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)
129 amt
= sk_stream_wspace(asoc
->base
.sk
);
134 amt
= asoc
->base
.sk
->sk_sndbuf
- amt
;
139 /* Increment the used sndbuf space count of the corresponding association by
140 * the size of the outgoing data chunk.
141 * Also, set the skb destructor for sndbuf accounting later.
143 * Since it is always 1-1 between chunk and skb, and also a new skb is always
144 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
145 * destructor in the data chunk skb for the purpose of the sndbuf space
148 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
150 struct sctp_association
*asoc
= chunk
->asoc
;
151 struct sock
*sk
= asoc
->base
.sk
;
153 /* The sndbuf space is tracked per association. */
154 sctp_association_hold(asoc
);
156 skb_set_owner_w(chunk
->skb
, sk
);
158 chunk
->skb
->destructor
= sctp_wfree
;
159 /* Save the chunk pointer in skb for sctp_wfree to use later. */
160 skb_shinfo(chunk
->skb
)->destructor_arg
= chunk
;
162 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
163 sizeof(struct sk_buff
) +
164 sizeof(struct sctp_chunk
);
166 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
167 sk
->sk_wmem_queued
+= chunk
->skb
->truesize
;
168 sk_mem_charge(sk
, chunk
->skb
->truesize
);
171 /* Verify that this is a valid address. */
172 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
177 /* Verify basic sockaddr. */
178 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
182 /* Is this a valid SCTP address? */
183 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
186 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
192 /* Look up the association by its id. If this is not a UDP-style
193 * socket, the ID field is always ignored.
195 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
197 struct sctp_association
*asoc
= NULL
;
199 /* If this is not a UDP-style socket, assoc id should be ignored. */
200 if (!sctp_style(sk
, UDP
)) {
201 /* Return NULL if the socket state is not ESTABLISHED. It
202 * could be a TCP-style listening socket or a socket which
203 * hasn't yet called connect() to establish an association.
205 if (!sctp_sstate(sk
, ESTABLISHED
) && !sctp_sstate(sk
, CLOSING
))
208 /* Get the first and the only association from the list. */
209 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
210 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
211 struct sctp_association
, asocs
);
215 /* Otherwise this is a UDP-style socket. */
216 if (!id
|| (id
== (sctp_assoc_t
)-1))
219 spin_lock_bh(&sctp_assocs_id_lock
);
220 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
221 spin_unlock_bh(&sctp_assocs_id_lock
);
223 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
229 /* Look up the transport from an address and an assoc id. If both address and
230 * id are specified, the associations matching the address and the id should be
233 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
234 struct sockaddr_storage
*addr
,
237 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
238 struct sctp_transport
*transport
;
239 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
241 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
248 id_asoc
= sctp_id2assoc(sk
, id
);
249 if (id_asoc
&& (id_asoc
!= addr_asoc
))
252 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sctp_sk(sk
),
253 (union sctp_addr
*)addr
);
258 /* API 3.1.2 bind() - UDP Style Syntax
259 * The syntax of bind() is,
261 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
263 * sd - the socket descriptor returned by socket().
264 * addr - the address structure (struct sockaddr_in or struct
265 * sockaddr_in6 [RFC 2553]),
266 * addr_len - the size of the address structure.
268 static int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
274 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__
, sk
,
277 /* Disallow binding twice. */
278 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
279 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
289 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
291 /* Verify this is a valid sockaddr. */
292 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
293 union sctp_addr
*addr
, int len
)
297 /* Check minimum size. */
298 if (len
< sizeof (struct sockaddr
))
301 /* V4 mapped address are really of AF_INET family */
302 if (addr
->sa
.sa_family
== AF_INET6
&&
303 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
)) {
304 if (!opt
->pf
->af_supported(AF_INET
, opt
))
307 /* Does this PF support this AF? */
308 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
312 /* If we get this far, af is valid. */
313 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
315 if (len
< af
->sockaddr_len
)
321 /* Bind a local address either to an endpoint or to an association. */
322 static int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
324 struct net
*net
= sock_net(sk
);
325 struct sctp_sock
*sp
= sctp_sk(sk
);
326 struct sctp_endpoint
*ep
= sp
->ep
;
327 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
332 /* Common sockaddr verification. */
333 af
= sctp_sockaddr_af(sp
, addr
, len
);
335 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
336 __func__
, sk
, addr
, len
);
340 snum
= ntohs(addr
->v4
.sin_port
);
342 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
343 __func__
, sk
, &addr
->sa
, bp
->port
, snum
, len
);
345 /* PF specific bind() address verification. */
346 if (!sp
->pf
->bind_verify(sp
, addr
))
347 return -EADDRNOTAVAIL
;
349 /* We must either be unbound, or bind to the same port.
350 * It's OK to allow 0 ports if we are already bound.
351 * We'll just inhert an already bound port in this case
356 else if (snum
!= bp
->port
) {
357 pr_debug("%s: new port %d doesn't match existing port "
358 "%d\n", __func__
, snum
, bp
->port
);
363 if (snum
&& snum
< PROT_SOCK
&&
364 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
))
367 /* See if the address matches any of the addresses we may have
368 * already bound before checking against other endpoints.
370 if (sctp_bind_addr_match(bp
, addr
, sp
))
373 /* Make sure we are allowed to bind here.
374 * The function sctp_get_port_local() does duplicate address
377 addr
->v4
.sin_port
= htons(snum
);
378 if ((ret
= sctp_get_port_local(sk
, addr
))) {
382 /* Refresh ephemeral port. */
384 bp
->port
= inet_sk(sk
)->inet_num
;
386 /* Add the address to the bind address list.
387 * Use GFP_ATOMIC since BHs will be disabled.
389 ret
= sctp_add_bind_addr(bp
, addr
, af
->sockaddr_len
,
390 SCTP_ADDR_SRC
, GFP_ATOMIC
);
392 /* Copy back into socket for getsockname() use. */
394 inet_sk(sk
)->inet_sport
= htons(inet_sk(sk
)->inet_num
);
395 sp
->pf
->to_sk_saddr(addr
, sk
);
401 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
403 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
404 * at any one time. If a sender, after sending an ASCONF chunk, decides
405 * it needs to transfer another ASCONF Chunk, it MUST wait until the
406 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
407 * subsequent ASCONF. Note this restriction binds each side, so at any
408 * time two ASCONF may be in-transit on any given association (one sent
409 * from each endpoint).
411 static int sctp_send_asconf(struct sctp_association
*asoc
,
412 struct sctp_chunk
*chunk
)
414 struct net
*net
= sock_net(asoc
->base
.sk
);
417 /* If there is an outstanding ASCONF chunk, queue it for later
420 if (asoc
->addip_last_asconf
) {
421 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
425 /* Hold the chunk until an ASCONF_ACK is received. */
426 sctp_chunk_hold(chunk
);
427 retval
= sctp_primitive_ASCONF(net
, asoc
, chunk
);
429 sctp_chunk_free(chunk
);
431 asoc
->addip_last_asconf
= chunk
;
437 /* Add a list of addresses as bind addresses to local endpoint or
440 * Basically run through each address specified in the addrs/addrcnt
441 * array/length pair, determine if it is IPv6 or IPv4 and call
442 * sctp_do_bind() on it.
444 * If any of them fails, then the operation will be reversed and the
445 * ones that were added will be removed.
447 * Only sctp_setsockopt_bindx() is supposed to call this function.
449 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
454 struct sockaddr
*sa_addr
;
457 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__
, sk
,
461 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
462 /* The list may contain either IPv4 or IPv6 address;
463 * determine the address length for walking thru the list.
466 af
= sctp_get_af_specific(sa_addr
->sa_family
);
472 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
475 addr_buf
+= af
->sockaddr_len
;
479 /* Failed. Cleanup the ones that have been added */
481 sctp_bindx_rem(sk
, addrs
, cnt
);
489 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
490 * associations that are part of the endpoint indicating that a list of local
491 * addresses are added to the endpoint.
493 * If any of the addresses is already in the bind address list of the
494 * association, we do not send the chunk for that association. But it will not
495 * affect other associations.
497 * Only sctp_setsockopt_bindx() is supposed to call this function.
499 static int sctp_send_asconf_add_ip(struct sock
*sk
,
500 struct sockaddr
*addrs
,
503 struct net
*net
= sock_net(sk
);
504 struct sctp_sock
*sp
;
505 struct sctp_endpoint
*ep
;
506 struct sctp_association
*asoc
;
507 struct sctp_bind_addr
*bp
;
508 struct sctp_chunk
*chunk
;
509 struct sctp_sockaddr_entry
*laddr
;
510 union sctp_addr
*addr
;
511 union sctp_addr saveaddr
;
518 if (!net
->sctp
.addip_enable
)
524 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
525 __func__
, sk
, addrs
, addrcnt
);
527 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
528 if (!asoc
->peer
.asconf_capable
)
531 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
534 if (!sctp_state(asoc
, ESTABLISHED
))
537 /* Check if any address in the packed array of addresses is
538 * in the bind address list of the association. If so,
539 * do not send the asconf chunk to its peer, but continue with
540 * other associations.
543 for (i
= 0; i
< addrcnt
; i
++) {
545 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
551 if (sctp_assoc_lookup_laddr(asoc
, addr
))
554 addr_buf
+= af
->sockaddr_len
;
559 /* Use the first valid address in bind addr list of
560 * association as Address Parameter of ASCONF CHUNK.
562 bp
= &asoc
->base
.bind_addr
;
563 p
= bp
->address_list
.next
;
564 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
565 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
566 addrcnt
, SCTP_PARAM_ADD_IP
);
572 /* Add the new addresses to the bind address list with
573 * use_as_src set to 0.
576 for (i
= 0; i
< addrcnt
; i
++) {
578 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
579 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
580 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
582 SCTP_ADDR_NEW
, GFP_ATOMIC
);
583 addr_buf
+= af
->sockaddr_len
;
585 if (asoc
->src_out_of_asoc_ok
) {
586 struct sctp_transport
*trans
;
588 list_for_each_entry(trans
,
589 &asoc
->peer
.transport_addr_list
, transports
) {
590 /* Clear the source and route cache */
591 dst_release(trans
->dst
);
592 trans
->cwnd
= min(4*asoc
->pathmtu
, max_t(__u32
,
593 2*asoc
->pathmtu
, 4380));
594 trans
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
595 trans
->rto
= asoc
->rto_initial
;
596 sctp_max_rto(asoc
, trans
);
597 trans
->rtt
= trans
->srtt
= trans
->rttvar
= 0;
598 sctp_transport_route(trans
, NULL
,
599 sctp_sk(asoc
->base
.sk
));
602 retval
= sctp_send_asconf(asoc
, chunk
);
609 /* Remove a list of addresses from bind addresses list. Do not remove the
612 * Basically run through each address specified in the addrs/addrcnt
613 * array/length pair, determine if it is IPv6 or IPv4 and call
614 * sctp_del_bind() on it.
616 * If any of them fails, then the operation will be reversed and the
617 * ones that were removed will be added back.
619 * At least one address has to be left; if only one address is
620 * available, the operation will return -EBUSY.
622 * Only sctp_setsockopt_bindx() is supposed to call this function.
624 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
626 struct sctp_sock
*sp
= sctp_sk(sk
);
627 struct sctp_endpoint
*ep
= sp
->ep
;
629 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
632 union sctp_addr
*sa_addr
;
635 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
636 __func__
, sk
, addrs
, addrcnt
);
639 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
640 /* If the bind address list is empty or if there is only one
641 * bind address, there is nothing more to be removed (we need
642 * at least one address here).
644 if (list_empty(&bp
->address_list
) ||
645 (sctp_list_single_entry(&bp
->address_list
))) {
651 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
657 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
658 retval
= -EADDRNOTAVAIL
;
662 if (sa_addr
->v4
.sin_port
&&
663 sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
668 if (!sa_addr
->v4
.sin_port
)
669 sa_addr
->v4
.sin_port
= htons(bp
->port
);
671 /* FIXME - There is probably a need to check if sk->sk_saddr and
672 * sk->sk_rcv_addr are currently set to one of the addresses to
673 * be removed. This is something which needs to be looked into
674 * when we are fixing the outstanding issues with multi-homing
675 * socket routing and failover schemes. Refer to comments in
676 * sctp_do_bind(). -daisy
678 retval
= sctp_del_bind_addr(bp
, sa_addr
);
680 addr_buf
+= af
->sockaddr_len
;
683 /* Failed. Add the ones that has been removed back */
685 sctp_bindx_add(sk
, addrs
, cnt
);
693 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
694 * the associations that are part of the endpoint indicating that a list of
695 * local addresses are removed from the endpoint.
697 * If any of the addresses is already in the bind address list of the
698 * association, we do not send the chunk for that association. But it will not
699 * affect other associations.
701 * Only sctp_setsockopt_bindx() is supposed to call this function.
703 static int sctp_send_asconf_del_ip(struct sock
*sk
,
704 struct sockaddr
*addrs
,
707 struct net
*net
= sock_net(sk
);
708 struct sctp_sock
*sp
;
709 struct sctp_endpoint
*ep
;
710 struct sctp_association
*asoc
;
711 struct sctp_transport
*transport
;
712 struct sctp_bind_addr
*bp
;
713 struct sctp_chunk
*chunk
;
714 union sctp_addr
*laddr
;
717 struct sctp_sockaddr_entry
*saddr
;
723 if (!net
->sctp
.addip_enable
)
729 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
730 __func__
, sk
, addrs
, addrcnt
);
732 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
734 if (!asoc
->peer
.asconf_capable
)
737 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
740 if (!sctp_state(asoc
, ESTABLISHED
))
743 /* Check if any address in the packed array of addresses is
744 * not present in the bind address list of the association.
745 * If so, do not send the asconf chunk to its peer, but
746 * continue with other associations.
749 for (i
= 0; i
< addrcnt
; i
++) {
751 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
757 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
760 addr_buf
+= af
->sockaddr_len
;
765 /* Find one address in the association's bind address list
766 * that is not in the packed array of addresses. This is to
767 * make sure that we do not delete all the addresses in the
770 bp
= &asoc
->base
.bind_addr
;
771 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
773 if ((laddr
== NULL
) && (addrcnt
== 1)) {
774 if (asoc
->asconf_addr_del_pending
)
776 asoc
->asconf_addr_del_pending
=
777 kzalloc(sizeof(union sctp_addr
), GFP_ATOMIC
);
778 if (asoc
->asconf_addr_del_pending
== NULL
) {
782 asoc
->asconf_addr_del_pending
->sa
.sa_family
=
784 asoc
->asconf_addr_del_pending
->v4
.sin_port
=
786 if (addrs
->sa_family
== AF_INET
) {
787 struct sockaddr_in
*sin
;
789 sin
= (struct sockaddr_in
*)addrs
;
790 asoc
->asconf_addr_del_pending
->v4
.sin_addr
.s_addr
= sin
->sin_addr
.s_addr
;
791 } else if (addrs
->sa_family
== AF_INET6
) {
792 struct sockaddr_in6
*sin6
;
794 sin6
= (struct sockaddr_in6
*)addrs
;
795 asoc
->asconf_addr_del_pending
->v6
.sin6_addr
= sin6
->sin6_addr
;
798 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
799 __func__
, asoc
, &asoc
->asconf_addr_del_pending
->sa
,
800 asoc
->asconf_addr_del_pending
);
802 asoc
->src_out_of_asoc_ok
= 1;
810 /* We do not need RCU protection throughout this loop
811 * because this is done under a socket lock from the
814 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
822 /* Reset use_as_src flag for the addresses in the bind address
823 * list that are to be deleted.
826 for (i
= 0; i
< addrcnt
; i
++) {
828 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
829 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
830 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
831 saddr
->state
= SCTP_ADDR_DEL
;
833 addr_buf
+= af
->sockaddr_len
;
836 /* Update the route and saddr entries for all the transports
837 * as some of the addresses in the bind address list are
838 * about to be deleted and cannot be used as source addresses.
840 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
842 dst_release(transport
->dst
);
843 sctp_transport_route(transport
, NULL
,
844 sctp_sk(asoc
->base
.sk
));
848 /* We don't need to transmit ASCONF */
850 retval
= sctp_send_asconf(asoc
, chunk
);
856 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
857 int sctp_asconf_mgmt(struct sctp_sock
*sp
, struct sctp_sockaddr_entry
*addrw
)
859 struct sock
*sk
= sctp_opt2sk(sp
);
860 union sctp_addr
*addr
;
863 /* It is safe to write port space in caller. */
865 addr
->v4
.sin_port
= htons(sp
->ep
->base
.bind_addr
.port
);
866 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
869 if (sctp_verify_addr(sk
, addr
, af
->sockaddr_len
))
872 if (addrw
->state
== SCTP_ADDR_NEW
)
873 return sctp_send_asconf_add_ip(sk
, (struct sockaddr
*)addr
, 1);
875 return sctp_send_asconf_del_ip(sk
, (struct sockaddr
*)addr
, 1);
878 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
881 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
884 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
885 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
888 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
889 * Section 3.1.2 for this usage.
891 * addrs is a pointer to an array of one or more socket addresses. Each
892 * address is contained in its appropriate structure (i.e. struct
893 * sockaddr_in or struct sockaddr_in6) the family of the address type
894 * must be used to distinguish the address length (note that this
895 * representation is termed a "packed array" of addresses). The caller
896 * specifies the number of addresses in the array with addrcnt.
898 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
899 * -1, and sets errno to the appropriate error code.
901 * For SCTP, the port given in each socket address must be the same, or
902 * sctp_bindx() will fail, setting errno to EINVAL.
904 * The flags parameter is formed from the bitwise OR of zero or more of
905 * the following currently defined flags:
907 * SCTP_BINDX_ADD_ADDR
909 * SCTP_BINDX_REM_ADDR
911 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
912 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
913 * addresses from the association. The two flags are mutually exclusive;
914 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
915 * not remove all addresses from an association; sctp_bindx() will
916 * reject such an attempt with EINVAL.
918 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
919 * additional addresses with an endpoint after calling bind(). Or use
920 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
921 * socket is associated with so that no new association accepted will be
922 * associated with those addresses. If the endpoint supports dynamic
923 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
924 * endpoint to send the appropriate message to the peer to change the
925 * peers address lists.
927 * Adding and removing addresses from a connected association is
928 * optional functionality. Implementations that do not support this
929 * functionality should return EOPNOTSUPP.
931 * Basically do nothing but copying the addresses from user to kernel
932 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
933 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
936 * We don't use copy_from_user() for optimization: we first do the
937 * sanity checks (buffer size -fast- and access check-healthy
938 * pointer); if all of those succeed, then we can alloc the memory
939 * (expensive operation) needed to copy the data to kernel. Then we do
940 * the copying without checking the user space area
941 * (__copy_from_user()).
943 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
946 * sk The sk of the socket
947 * addrs The pointer to the addresses in user land
948 * addrssize Size of the addrs buffer
949 * op Operation to perform (add or remove, see the flags of
952 * Returns 0 if ok, <0 errno code on error.
954 static int sctp_setsockopt_bindx(struct sock
*sk
,
955 struct sockaddr __user
*addrs
,
956 int addrs_size
, int op
)
958 struct sockaddr
*kaddrs
;
962 struct sockaddr
*sa_addr
;
966 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
967 __func__
, sk
, addrs
, addrs_size
, op
);
969 if (unlikely(addrs_size
<= 0))
972 /* Check the user passed a healthy pointer. */
973 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
976 /* Alloc space for the address array in kernel memory. */
977 kaddrs
= kmalloc(addrs_size
, GFP_USER
| __GFP_NOWARN
);
978 if (unlikely(!kaddrs
))
981 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
986 /* Walk through the addrs buffer and count the number of addresses. */
988 while (walk_size
< addrs_size
) {
989 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
995 af
= sctp_get_af_specific(sa_addr
->sa_family
);
997 /* If the address family is not supported or if this address
998 * causes the address buffer to overflow return EINVAL.
1000 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1005 addr_buf
+= af
->sockaddr_len
;
1006 walk_size
+= af
->sockaddr_len
;
1011 case SCTP_BINDX_ADD_ADDR
:
1012 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
1015 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
1018 case SCTP_BINDX_REM_ADDR
:
1019 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
1022 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
1036 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1038 * Common routine for handling connect() and sctp_connectx().
1039 * Connect will come in with just a single address.
1041 static int __sctp_connect(struct sock
*sk
,
1042 struct sockaddr
*kaddrs
,
1044 sctp_assoc_t
*assoc_id
)
1046 struct net
*net
= sock_net(sk
);
1047 struct sctp_sock
*sp
;
1048 struct sctp_endpoint
*ep
;
1049 struct sctp_association
*asoc
= NULL
;
1050 struct sctp_association
*asoc2
;
1051 struct sctp_transport
*transport
;
1058 union sctp_addr
*sa_addr
= NULL
;
1060 unsigned short port
;
1061 unsigned int f_flags
= 0;
1066 /* connect() cannot be done on a socket that is already in ESTABLISHED
1067 * state - UDP-style peeled off socket or a TCP-style socket that
1068 * is already connected.
1069 * It cannot be done even on a TCP-style listening socket.
1071 if (sctp_sstate(sk
, ESTABLISHED
) || sctp_sstate(sk
, CLOSING
) ||
1072 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
1077 /* Walk through the addrs buffer and count the number of addresses. */
1079 while (walk_size
< addrs_size
) {
1082 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1088 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1090 /* If the address family is not supported or if this address
1091 * causes the address buffer to overflow return EINVAL.
1093 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1098 port
= ntohs(sa_addr
->v4
.sin_port
);
1100 /* Save current address so we can work with it */
1101 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1103 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1107 /* Make sure the destination port is correctly set
1110 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
) {
1115 /* Check if there already is a matching association on the
1116 * endpoint (other than the one created here).
1118 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1119 if (asoc2
&& asoc2
!= asoc
) {
1120 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1127 /* If we could not find a matching association on the endpoint,
1128 * make sure that there is no peeled-off association matching
1129 * the peer address even on another socket.
1131 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1132 err
= -EADDRNOTAVAIL
;
1137 /* If a bind() or sctp_bindx() is not called prior to
1138 * an sctp_connectx() call, the system picks an
1139 * ephemeral port and will choose an address set
1140 * equivalent to binding with a wildcard address.
1142 if (!ep
->base
.bind_addr
.port
) {
1143 if (sctp_autobind(sk
)) {
1149 * If an unprivileged user inherits a 1-many
1150 * style socket with open associations on a
1151 * privileged port, it MAY be permitted to
1152 * accept new associations, but it SHOULD NOT
1153 * be permitted to open new associations.
1155 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1156 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
)) {
1162 scope
= sctp_scope(&to
);
1163 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1169 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
,
1177 /* Prime the peer's transport structures. */
1178 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1186 addr_buf
+= af
->sockaddr_len
;
1187 walk_size
+= af
->sockaddr_len
;
1190 /* In case the user of sctp_connectx() wants an association
1191 * id back, assign one now.
1194 err
= sctp_assoc_set_id(asoc
, GFP_KERNEL
);
1199 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1204 /* Initialize sk's dport and daddr for getpeername() */
1205 inet_sk(sk
)->inet_dport
= htons(asoc
->peer
.port
);
1206 sp
->pf
->to_sk_daddr(sa_addr
, sk
);
1209 /* in-kernel sockets don't generally have a file allocated to them
1210 * if all they do is call sock_create_kern().
1212 if (sk
->sk_socket
->file
)
1213 f_flags
= sk
->sk_socket
->file
->f_flags
;
1215 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1218 *assoc_id
= asoc
->assoc_id
;
1219 err
= sctp_wait_for_connect(asoc
, &timeo
);
1220 /* Note: the asoc may be freed after the return of
1221 * sctp_wait_for_connect.
1224 /* Don't free association on exit. */
1228 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1229 __func__
, asoc
, kaddrs
, err
);
1232 /* sctp_primitive_ASSOCIATE may have added this association
1233 * To the hash table, try to unhash it, just in case, its a noop
1234 * if it wasn't hashed so we're safe
1236 sctp_association_free(asoc
);
1241 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1244 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1245 * sctp_assoc_t *asoc);
1247 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1248 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1249 * or IPv6 addresses.
1251 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1252 * Section 3.1.2 for this usage.
1254 * addrs is a pointer to an array of one or more socket addresses. Each
1255 * address is contained in its appropriate structure (i.e. struct
1256 * sockaddr_in or struct sockaddr_in6) the family of the address type
1257 * must be used to distengish the address length (note that this
1258 * representation is termed a "packed array" of addresses). The caller
1259 * specifies the number of addresses in the array with addrcnt.
1261 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1262 * the association id of the new association. On failure, sctp_connectx()
1263 * returns -1, and sets errno to the appropriate error code. The assoc_id
1264 * is not touched by the kernel.
1266 * For SCTP, the port given in each socket address must be the same, or
1267 * sctp_connectx() will fail, setting errno to EINVAL.
1269 * An application can use sctp_connectx to initiate an association with
1270 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1271 * allows a caller to specify multiple addresses at which a peer can be
1272 * reached. The way the SCTP stack uses the list of addresses to set up
1273 * the association is implementation dependent. This function only
1274 * specifies that the stack will try to make use of all the addresses in
1275 * the list when needed.
1277 * Note that the list of addresses passed in is only used for setting up
1278 * the association. It does not necessarily equal the set of addresses
1279 * the peer uses for the resulting association. If the caller wants to
1280 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1281 * retrieve them after the association has been set up.
1283 * Basically do nothing but copying the addresses from user to kernel
1284 * land and invoking either sctp_connectx(). This is used for tunneling
1285 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1287 * We don't use copy_from_user() for optimization: we first do the
1288 * sanity checks (buffer size -fast- and access check-healthy
1289 * pointer); if all of those succeed, then we can alloc the memory
1290 * (expensive operation) needed to copy the data to kernel. Then we do
1291 * the copying without checking the user space area
1292 * (__copy_from_user()).
1294 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1297 * sk The sk of the socket
1298 * addrs The pointer to the addresses in user land
1299 * addrssize Size of the addrs buffer
1301 * Returns >=0 if ok, <0 errno code on error.
1303 static int __sctp_setsockopt_connectx(struct sock
*sk
,
1304 struct sockaddr __user
*addrs
,
1306 sctp_assoc_t
*assoc_id
)
1308 struct sockaddr
*kaddrs
;
1309 gfp_t gfp
= GFP_KERNEL
;
1312 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1313 __func__
, sk
, addrs
, addrs_size
);
1315 if (unlikely(addrs_size
<= 0))
1318 /* Check the user passed a healthy pointer. */
1319 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1322 /* Alloc space for the address array in kernel memory. */
1323 if (sk
->sk_socket
->file
)
1324 gfp
= GFP_USER
| __GFP_NOWARN
;
1325 kaddrs
= kmalloc(addrs_size
, gfp
);
1326 if (unlikely(!kaddrs
))
1329 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1332 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, assoc_id
);
1341 * This is an older interface. It's kept for backward compatibility
1342 * to the option that doesn't provide association id.
1344 static int sctp_setsockopt_connectx_old(struct sock
*sk
,
1345 struct sockaddr __user
*addrs
,
1348 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1352 * New interface for the API. The since the API is done with a socket
1353 * option, to make it simple we feed back the association id is as a return
1354 * indication to the call. Error is always negative and association id is
1357 static int sctp_setsockopt_connectx(struct sock
*sk
,
1358 struct sockaddr __user
*addrs
,
1361 sctp_assoc_t assoc_id
= 0;
1364 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1373 * New (hopefully final) interface for the API.
1374 * We use the sctp_getaddrs_old structure so that use-space library
1375 * can avoid any unnecessary allocations. The only different part
1376 * is that we store the actual length of the address buffer into the
1377 * addrs_num structure member. That way we can re-use the existing
1380 #ifdef CONFIG_COMPAT
1381 struct compat_sctp_getaddrs_old
{
1382 sctp_assoc_t assoc_id
;
1384 compat_uptr_t addrs
; /* struct sockaddr * */
1388 static int sctp_getsockopt_connectx3(struct sock
*sk
, int len
,
1389 char __user
*optval
,
1392 struct sctp_getaddrs_old param
;
1393 sctp_assoc_t assoc_id
= 0;
1396 #ifdef CONFIG_COMPAT
1397 if (in_compat_syscall()) {
1398 struct compat_sctp_getaddrs_old param32
;
1400 if (len
< sizeof(param32
))
1402 if (copy_from_user(¶m32
, optval
, sizeof(param32
)))
1405 param
.assoc_id
= param32
.assoc_id
;
1406 param
.addr_num
= param32
.addr_num
;
1407 param
.addrs
= compat_ptr(param32
.addrs
);
1411 if (len
< sizeof(param
))
1413 if (copy_from_user(¶m
, optval
, sizeof(param
)))
1417 err
= __sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)
1418 param
.addrs
, param
.addr_num
,
1420 if (err
== 0 || err
== -EINPROGRESS
) {
1421 if (copy_to_user(optval
, &assoc_id
, sizeof(assoc_id
)))
1423 if (put_user(sizeof(assoc_id
), optlen
))
1430 /* API 3.1.4 close() - UDP Style Syntax
1431 * Applications use close() to perform graceful shutdown (as described in
1432 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1433 * by a UDP-style socket.
1437 * ret = close(int sd);
1439 * sd - the socket descriptor of the associations to be closed.
1441 * To gracefully shutdown a specific association represented by the
1442 * UDP-style socket, an application should use the sendmsg() call,
1443 * passing no user data, but including the appropriate flag in the
1444 * ancillary data (see Section xxxx).
1446 * If sd in the close() call is a branched-off socket representing only
1447 * one association, the shutdown is performed on that association only.
1449 * 4.1.6 close() - TCP Style Syntax
1451 * Applications use close() to gracefully close down an association.
1455 * int close(int sd);
1457 * sd - the socket descriptor of the association to be closed.
1459 * After an application calls close() on a socket descriptor, no further
1460 * socket operations will succeed on that descriptor.
1462 * API 7.1.4 SO_LINGER
1464 * An application using the TCP-style socket can use this option to
1465 * perform the SCTP ABORT primitive. The linger option structure is:
1468 * int l_onoff; // option on/off
1469 * int l_linger; // linger time
1472 * To enable the option, set l_onoff to 1. If the l_linger value is set
1473 * to 0, calling close() is the same as the ABORT primitive. If the
1474 * value is set to a negative value, the setsockopt() call will return
1475 * an error. If the value is set to a positive value linger_time, the
1476 * close() can be blocked for at most linger_time ms. If the graceful
1477 * shutdown phase does not finish during this period, close() will
1478 * return but the graceful shutdown phase continues in the system.
1480 static void sctp_close(struct sock
*sk
, long timeout
)
1482 struct net
*net
= sock_net(sk
);
1483 struct sctp_endpoint
*ep
;
1484 struct sctp_association
*asoc
;
1485 struct list_head
*pos
, *temp
;
1486 unsigned int data_was_unread
;
1488 pr_debug("%s: sk:%p, timeout:%ld\n", __func__
, sk
, timeout
);
1491 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1492 sk
->sk_state
= SCTP_SS_CLOSING
;
1494 ep
= sctp_sk(sk
)->ep
;
1496 /* Clean up any skbs sitting on the receive queue. */
1497 data_was_unread
= sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1498 data_was_unread
+= sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1500 /* Walk all associations on an endpoint. */
1501 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1502 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1504 if (sctp_style(sk
, TCP
)) {
1505 /* A closed association can still be in the list if
1506 * it belongs to a TCP-style listening socket that is
1507 * not yet accepted. If so, free it. If not, send an
1508 * ABORT or SHUTDOWN based on the linger options.
1510 if (sctp_state(asoc
, CLOSED
)) {
1511 sctp_association_free(asoc
);
1516 if (data_was_unread
|| !skb_queue_empty(&asoc
->ulpq
.lobby
) ||
1517 !skb_queue_empty(&asoc
->ulpq
.reasm
) ||
1518 (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
)) {
1519 struct sctp_chunk
*chunk
;
1521 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1522 sctp_primitive_ABORT(net
, asoc
, chunk
);
1524 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1527 /* On a TCP-style socket, block for at most linger_time if set. */
1528 if (sctp_style(sk
, TCP
) && timeout
)
1529 sctp_wait_for_close(sk
, timeout
);
1531 /* This will run the backlog queue. */
1534 /* Supposedly, no process has access to the socket, but
1535 * the net layers still may.
1536 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1537 * held and that should be grabbed before socket lock.
1539 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
1542 /* Hold the sock, since sk_common_release() will put sock_put()
1543 * and we have just a little more cleanup.
1546 sk_common_release(sk
);
1549 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
1553 SCTP_DBG_OBJCNT_DEC(sock
);
1556 /* Handle EPIPE error. */
1557 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1560 err
= sock_error(sk
) ? : -EPIPE
;
1561 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1562 send_sig(SIGPIPE
, current
, 0);
1566 /* API 3.1.3 sendmsg() - UDP Style Syntax
1568 * An application uses sendmsg() and recvmsg() calls to transmit data to
1569 * and receive data from its peer.
1571 * ssize_t sendmsg(int socket, const struct msghdr *message,
1574 * socket - the socket descriptor of the endpoint.
1575 * message - pointer to the msghdr structure which contains a single
1576 * user message and possibly some ancillary data.
1578 * See Section 5 for complete description of the data
1581 * flags - flags sent or received with the user message, see Section
1582 * 5 for complete description of the flags.
1584 * Note: This function could use a rewrite especially when explicit
1585 * connect support comes in.
1587 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1589 static int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1591 static int sctp_sendmsg(struct sock
*sk
, struct msghdr
*msg
, size_t msg_len
)
1593 struct net
*net
= sock_net(sk
);
1594 struct sctp_sock
*sp
;
1595 struct sctp_endpoint
*ep
;
1596 struct sctp_association
*new_asoc
= NULL
, *asoc
= NULL
;
1597 struct sctp_transport
*transport
, *chunk_tp
;
1598 struct sctp_chunk
*chunk
;
1600 struct sockaddr
*msg_name
= NULL
;
1601 struct sctp_sndrcvinfo default_sinfo
;
1602 struct sctp_sndrcvinfo
*sinfo
;
1603 struct sctp_initmsg
*sinit
;
1604 sctp_assoc_t associd
= 0;
1605 sctp_cmsgs_t cmsgs
= { NULL
};
1607 bool fill_sinfo_ttl
= false, wait_connect
= false;
1608 struct sctp_datamsg
*datamsg
;
1609 int msg_flags
= msg
->msg_flags
;
1610 __u16 sinfo_flags
= 0;
1618 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__
, sk
,
1621 /* We cannot send a message over a TCP-style listening socket. */
1622 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1627 /* Parse out the SCTP CMSGs. */
1628 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1630 pr_debug("%s: msghdr parse err:%x\n", __func__
, err
);
1634 /* Fetch the destination address for this packet. This
1635 * address only selects the association--it is not necessarily
1636 * the address we will send to.
1637 * For a peeled-off socket, msg_name is ignored.
1639 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1640 int msg_namelen
= msg
->msg_namelen
;
1642 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1647 if (msg_namelen
> sizeof(to
))
1648 msg_namelen
= sizeof(to
);
1649 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1650 msg_name
= msg
->msg_name
;
1654 if (cmsgs
.sinfo
!= NULL
) {
1655 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1656 default_sinfo
.sinfo_stream
= cmsgs
.sinfo
->snd_sid
;
1657 default_sinfo
.sinfo_flags
= cmsgs
.sinfo
->snd_flags
;
1658 default_sinfo
.sinfo_ppid
= cmsgs
.sinfo
->snd_ppid
;
1659 default_sinfo
.sinfo_context
= cmsgs
.sinfo
->snd_context
;
1660 default_sinfo
.sinfo_assoc_id
= cmsgs
.sinfo
->snd_assoc_id
;
1662 sinfo
= &default_sinfo
;
1663 fill_sinfo_ttl
= true;
1665 sinfo
= cmsgs
.srinfo
;
1667 /* Did the user specify SNDINFO/SNDRCVINFO? */
1669 sinfo_flags
= sinfo
->sinfo_flags
;
1670 associd
= sinfo
->sinfo_assoc_id
;
1673 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__
,
1674 msg_len
, sinfo_flags
);
1676 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1677 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1682 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1683 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1684 * If SCTP_ABORT is set, the message length could be non zero with
1685 * the msg_iov set to the user abort reason.
1687 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1688 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1693 /* If SCTP_ADDR_OVER is set, there must be an address
1694 * specified in msg_name.
1696 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1703 pr_debug("%s: about to look up association\n", __func__
);
1707 /* If a msg_name has been specified, assume this is to be used. */
1709 /* Look for a matching association on the endpoint. */
1710 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1712 /* If we could not find a matching association on the
1713 * endpoint, make sure that it is not a TCP-style
1714 * socket that already has an association or there is
1715 * no peeled-off association on another socket.
1718 ((sctp_style(sk
, TCP
) &&
1719 (sctp_sstate(sk
, ESTABLISHED
) ||
1720 sctp_sstate(sk
, CLOSING
))) ||
1721 sctp_endpoint_is_peeled_off(ep
, &to
))) {
1722 err
= -EADDRNOTAVAIL
;
1726 asoc
= sctp_id2assoc(sk
, associd
);
1734 pr_debug("%s: just looked up association:%p\n", __func__
, asoc
);
1736 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1737 * socket that has an association in CLOSED state. This can
1738 * happen when an accepted socket has an association that is
1741 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1746 if (sinfo_flags
& SCTP_EOF
) {
1747 pr_debug("%s: shutting down association:%p\n",
1750 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1754 if (sinfo_flags
& SCTP_ABORT
) {
1756 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1762 pr_debug("%s: aborting association:%p\n",
1765 sctp_primitive_ABORT(net
, asoc
, chunk
);
1771 /* Do we need to create the association? */
1773 pr_debug("%s: there is no association yet\n", __func__
);
1775 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1780 /* Check for invalid stream against the stream counts,
1781 * either the default or the user specified stream counts.
1784 if (!sinit
|| !sinit
->sinit_num_ostreams
) {
1785 /* Check against the defaults. */
1786 if (sinfo
->sinfo_stream
>=
1787 sp
->initmsg
.sinit_num_ostreams
) {
1792 /* Check against the requested. */
1793 if (sinfo
->sinfo_stream
>=
1794 sinit
->sinit_num_ostreams
) {
1802 * API 3.1.2 bind() - UDP Style Syntax
1803 * If a bind() or sctp_bindx() is not called prior to a
1804 * sendmsg() call that initiates a new association, the
1805 * system picks an ephemeral port and will choose an address
1806 * set equivalent to binding with a wildcard address.
1808 if (!ep
->base
.bind_addr
.port
) {
1809 if (sctp_autobind(sk
)) {
1815 * If an unprivileged user inherits a one-to-many
1816 * style socket with open associations on a privileged
1817 * port, it MAY be permitted to accept new associations,
1818 * but it SHOULD NOT be permitted to open new
1821 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1822 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
)) {
1828 scope
= sctp_scope(&to
);
1829 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1835 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
, GFP_KERNEL
);
1841 /* If the SCTP_INIT ancillary data is specified, set all
1842 * the association init values accordingly.
1845 if (sinit
->sinit_num_ostreams
) {
1846 asoc
->c
.sinit_num_ostreams
=
1847 sinit
->sinit_num_ostreams
;
1849 if (sinit
->sinit_max_instreams
) {
1850 asoc
->c
.sinit_max_instreams
=
1851 sinit
->sinit_max_instreams
;
1853 if (sinit
->sinit_max_attempts
) {
1854 asoc
->max_init_attempts
1855 = sinit
->sinit_max_attempts
;
1857 if (sinit
->sinit_max_init_timeo
) {
1858 asoc
->max_init_timeo
=
1859 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1863 /* Prime the peer's transport structures. */
1864 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1871 /* ASSERT: we have a valid association at this point. */
1872 pr_debug("%s: we have a valid association\n", __func__
);
1875 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1876 * one with some defaults.
1878 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1879 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1880 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1881 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1882 default_sinfo
.sinfo_context
= asoc
->default_context
;
1883 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1884 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1886 sinfo
= &default_sinfo
;
1887 } else if (fill_sinfo_ttl
) {
1888 /* In case SNDINFO was specified, we still need to fill
1889 * it with a default ttl from the assoc here.
1891 sinfo
->sinfo_timetolive
= asoc
->default_timetolive
;
1894 /* API 7.1.7, the sndbuf size per association bounds the
1895 * maximum size of data that can be sent in a single send call.
1897 if (msg_len
> sk
->sk_sndbuf
) {
1902 if (asoc
->pmtu_pending
)
1903 sctp_assoc_pending_pmtu(sk
, asoc
);
1905 /* If fragmentation is disabled and the message length exceeds the
1906 * association fragmentation point, return EMSGSIZE. The I-D
1907 * does not specify what this error is, but this looks like
1910 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1915 /* Check for invalid stream. */
1916 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1921 if (sctp_wspace(asoc
) < msg_len
)
1922 sctp_prsctp_prune(asoc
, sinfo
, msg_len
- sctp_wspace(asoc
));
1924 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1925 if (!sctp_wspace(asoc
)) {
1926 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1931 /* If an address is passed with the sendto/sendmsg call, it is used
1932 * to override the primary destination address in the TCP model, or
1933 * when SCTP_ADDR_OVER flag is set in the UDP model.
1935 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1936 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1937 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1945 /* Auto-connect, if we aren't connected already. */
1946 if (sctp_state(asoc
, CLOSED
)) {
1947 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1951 wait_connect
= true;
1952 pr_debug("%s: we associated primitively\n", __func__
);
1955 /* Break the message into multiple chunks of maximum size. */
1956 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, &msg
->msg_iter
);
1957 if (IS_ERR(datamsg
)) {
1958 err
= PTR_ERR(datamsg
);
1962 /* Now send the (possibly) fragmented message. */
1963 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1964 sctp_chunk_hold(chunk
);
1966 /* Do accounting for the write space. */
1967 sctp_set_owner_w(chunk
);
1969 chunk
->transport
= chunk_tp
;
1972 /* Send it to the lower layers. Note: all chunks
1973 * must either fail or succeed. The lower layer
1974 * works that way today. Keep it that way or this
1977 err
= sctp_primitive_SEND(net
, asoc
, datamsg
);
1978 /* Did the lower layer accept the chunk? */
1980 sctp_datamsg_free(datamsg
);
1984 pr_debug("%s: we sent primitively\n", __func__
);
1986 sctp_datamsg_put(datamsg
);
1989 if (unlikely(wait_connect
)) {
1990 timeo
= sock_sndtimeo(sk
, msg_flags
& MSG_DONTWAIT
);
1991 sctp_wait_for_connect(asoc
, &timeo
);
1994 /* If we are already past ASSOCIATE, the lower
1995 * layers are responsible for association cleanup.
2001 sctp_association_free(asoc
);
2006 return sctp_error(sk
, msg_flags
, err
);
2013 err
= sock_error(sk
);
2023 /* This is an extended version of skb_pull() that removes the data from the
2024 * start of a skb even when data is spread across the list of skb's in the
2025 * frag_list. len specifies the total amount of data that needs to be removed.
2026 * when 'len' bytes could be removed from the skb, it returns 0.
2027 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2028 * could not be removed.
2030 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
2032 struct sk_buff
*list
;
2033 int skb_len
= skb_headlen(skb
);
2036 if (len
<= skb_len
) {
2037 __skb_pull(skb
, len
);
2041 __skb_pull(skb
, skb_len
);
2043 skb_walk_frags(skb
, list
) {
2044 rlen
= sctp_skb_pull(list
, len
);
2045 skb
->len
-= (len
-rlen
);
2046 skb
->data_len
-= (len
-rlen
);
2057 /* API 3.1.3 recvmsg() - UDP Style Syntax
2059 * ssize_t recvmsg(int socket, struct msghdr *message,
2062 * socket - the socket descriptor of the endpoint.
2063 * message - pointer to the msghdr structure which contains a single
2064 * user message and possibly some ancillary data.
2066 * See Section 5 for complete description of the data
2069 * flags - flags sent or received with the user message, see Section
2070 * 5 for complete description of the flags.
2072 static int sctp_recvmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
,
2073 int noblock
, int flags
, int *addr_len
)
2075 struct sctp_ulpevent
*event
= NULL
;
2076 struct sctp_sock
*sp
= sctp_sk(sk
);
2077 struct sk_buff
*skb
, *head_skb
;
2082 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2083 "addr_len:%p)\n", __func__
, sk
, msg
, len
, noblock
, flags
,
2088 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
) &&
2089 !sctp_sstate(sk
, CLOSING
) && !sctp_sstate(sk
, CLOSED
)) {
2094 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
2098 /* Get the total length of the skb including any skb's in the
2107 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
2109 event
= sctp_skb2event(skb
);
2114 if (event
->chunk
&& event
->chunk
->head_skb
)
2115 head_skb
= event
->chunk
->head_skb
;
2118 sock_recv_ts_and_drops(msg
, sk
, head_skb
);
2119 if (sctp_ulpevent_is_notification(event
)) {
2120 msg
->msg_flags
|= MSG_NOTIFICATION
;
2121 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
2123 sp
->pf
->skb_msgname(head_skb
, msg
->msg_name
, addr_len
);
2126 /* Check if we allow SCTP_NXTINFO. */
2127 if (sp
->recvnxtinfo
)
2128 sctp_ulpevent_read_nxtinfo(event
, msg
, sk
);
2129 /* Check if we allow SCTP_RCVINFO. */
2130 if (sp
->recvrcvinfo
)
2131 sctp_ulpevent_read_rcvinfo(event
, msg
);
2132 /* Check if we allow SCTP_SNDRCVINFO. */
2133 if (sp
->subscribe
.sctp_data_io_event
)
2134 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
2138 /* If skb's length exceeds the user's buffer, update the skb and
2139 * push it back to the receive_queue so that the next call to
2140 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2142 if (skb_len
> copied
) {
2143 msg
->msg_flags
&= ~MSG_EOR
;
2144 if (flags
& MSG_PEEK
)
2146 sctp_skb_pull(skb
, copied
);
2147 skb_queue_head(&sk
->sk_receive_queue
, skb
);
2149 /* When only partial message is copied to the user, increase
2150 * rwnd by that amount. If all the data in the skb is read,
2151 * rwnd is updated when the event is freed.
2153 if (!sctp_ulpevent_is_notification(event
))
2154 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
2156 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
2157 (event
->msg_flags
& MSG_EOR
))
2158 msg
->msg_flags
|= MSG_EOR
;
2160 msg
->msg_flags
&= ~MSG_EOR
;
2163 if (flags
& MSG_PEEK
) {
2164 /* Release the skb reference acquired after peeking the skb in
2165 * sctp_skb_recv_datagram().
2169 /* Free the event which includes releasing the reference to
2170 * the owner of the skb, freeing the skb and updating the
2173 sctp_ulpevent_free(event
);
2180 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2182 * This option is a on/off flag. If enabled no SCTP message
2183 * fragmentation will be performed. Instead if a message being sent
2184 * exceeds the current PMTU size, the message will NOT be sent and
2185 * instead a error will be indicated to the user.
2187 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
2188 char __user
*optval
,
2189 unsigned int optlen
)
2193 if (optlen
< sizeof(int))
2196 if (get_user(val
, (int __user
*)optval
))
2199 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
2204 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2205 unsigned int optlen
)
2207 struct sctp_association
*asoc
;
2208 struct sctp_ulpevent
*event
;
2210 if (optlen
> sizeof(struct sctp_event_subscribe
))
2212 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2215 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2216 * if there is no data to be sent or retransmit, the stack will
2217 * immediately send up this notification.
2219 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT
,
2220 &sctp_sk(sk
)->subscribe
)) {
2221 asoc
= sctp_id2assoc(sk
, 0);
2223 if (asoc
&& sctp_outq_is_empty(&asoc
->outqueue
)) {
2224 event
= sctp_ulpevent_make_sender_dry_event(asoc
,
2229 sctp_ulpq_tail_event(&asoc
->ulpq
, event
);
2236 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2238 * This socket option is applicable to the UDP-style socket only. When
2239 * set it will cause associations that are idle for more than the
2240 * specified number of seconds to automatically close. An association
2241 * being idle is defined an association that has NOT sent or received
2242 * user data. The special value of '0' indicates that no automatic
2243 * close of any associations should be performed. The option expects an
2244 * integer defining the number of seconds of idle time before an
2245 * association is closed.
2247 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2248 unsigned int optlen
)
2250 struct sctp_sock
*sp
= sctp_sk(sk
);
2251 struct net
*net
= sock_net(sk
);
2253 /* Applicable to UDP-style socket only */
2254 if (sctp_style(sk
, TCP
))
2256 if (optlen
!= sizeof(int))
2258 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2261 if (sp
->autoclose
> net
->sctp
.max_autoclose
)
2262 sp
->autoclose
= net
->sctp
.max_autoclose
;
2267 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2269 * Applications can enable or disable heartbeats for any peer address of
2270 * an association, modify an address's heartbeat interval, force a
2271 * heartbeat to be sent immediately, and adjust the address's maximum
2272 * number of retransmissions sent before an address is considered
2273 * unreachable. The following structure is used to access and modify an
2274 * address's parameters:
2276 * struct sctp_paddrparams {
2277 * sctp_assoc_t spp_assoc_id;
2278 * struct sockaddr_storage spp_address;
2279 * uint32_t spp_hbinterval;
2280 * uint16_t spp_pathmaxrxt;
2281 * uint32_t spp_pathmtu;
2282 * uint32_t spp_sackdelay;
2283 * uint32_t spp_flags;
2286 * spp_assoc_id - (one-to-many style socket) This is filled in the
2287 * application, and identifies the association for
2289 * spp_address - This specifies which address is of interest.
2290 * spp_hbinterval - This contains the value of the heartbeat interval,
2291 * in milliseconds. If a value of zero
2292 * is present in this field then no changes are to
2293 * be made to this parameter.
2294 * spp_pathmaxrxt - This contains the maximum number of
2295 * retransmissions before this address shall be
2296 * considered unreachable. If a value of zero
2297 * is present in this field then no changes are to
2298 * be made to this parameter.
2299 * spp_pathmtu - When Path MTU discovery is disabled the value
2300 * specified here will be the "fixed" path mtu.
2301 * Note that if the spp_address field is empty
2302 * then all associations on this address will
2303 * have this fixed path mtu set upon them.
2305 * spp_sackdelay - When delayed sack is enabled, this value specifies
2306 * the number of milliseconds that sacks will be delayed
2307 * for. This value will apply to all addresses of an
2308 * association if the spp_address field is empty. Note
2309 * also, that if delayed sack is enabled and this
2310 * value is set to 0, no change is made to the last
2311 * recorded delayed sack timer value.
2313 * spp_flags - These flags are used to control various features
2314 * on an association. The flag field may contain
2315 * zero or more of the following options.
2317 * SPP_HB_ENABLE - Enable heartbeats on the
2318 * specified address. Note that if the address
2319 * field is empty all addresses for the association
2320 * have heartbeats enabled upon them.
2322 * SPP_HB_DISABLE - Disable heartbeats on the
2323 * speicifed address. Note that if the address
2324 * field is empty all addresses for the association
2325 * will have their heartbeats disabled. Note also
2326 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2327 * mutually exclusive, only one of these two should
2328 * be specified. Enabling both fields will have
2329 * undetermined results.
2331 * SPP_HB_DEMAND - Request a user initiated heartbeat
2332 * to be made immediately.
2334 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2335 * heartbeat delayis to be set to the value of 0
2338 * SPP_PMTUD_ENABLE - This field will enable PMTU
2339 * discovery upon the specified address. Note that
2340 * if the address feild is empty then all addresses
2341 * on the association are effected.
2343 * SPP_PMTUD_DISABLE - This field will disable PMTU
2344 * discovery upon the specified address. Note that
2345 * if the address feild is empty then all addresses
2346 * on the association are effected. Not also that
2347 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2348 * exclusive. Enabling both will have undetermined
2351 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2352 * on delayed sack. The time specified in spp_sackdelay
2353 * is used to specify the sack delay for this address. Note
2354 * that if spp_address is empty then all addresses will
2355 * enable delayed sack and take on the sack delay
2356 * value specified in spp_sackdelay.
2357 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2358 * off delayed sack. If the spp_address field is blank then
2359 * delayed sack is disabled for the entire association. Note
2360 * also that this field is mutually exclusive to
2361 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2364 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2365 struct sctp_transport
*trans
,
2366 struct sctp_association
*asoc
,
2367 struct sctp_sock
*sp
,
2370 int sackdelay_change
)
2374 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2375 struct net
*net
= sock_net(trans
->asoc
->base
.sk
);
2377 error
= sctp_primitive_REQUESTHEARTBEAT(net
, trans
->asoc
, trans
);
2382 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2383 * this field is ignored. Note also that a value of zero indicates
2384 * the current setting should be left unchanged.
2386 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2388 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2389 * set. This lets us use 0 value when this flag
2392 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2393 params
->spp_hbinterval
= 0;
2395 if (params
->spp_hbinterval
||
2396 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2399 msecs_to_jiffies(params
->spp_hbinterval
);
2402 msecs_to_jiffies(params
->spp_hbinterval
);
2404 sp
->hbinterval
= params
->spp_hbinterval
;
2411 trans
->param_flags
=
2412 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2415 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2418 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2422 /* When Path MTU discovery is disabled the value specified here will
2423 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2424 * include the flag SPP_PMTUD_DISABLE for this field to have any
2427 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2429 trans
->pathmtu
= params
->spp_pathmtu
;
2430 sctp_assoc_sync_pmtu(sctp_opt2sk(sp
), asoc
);
2432 asoc
->pathmtu
= params
->spp_pathmtu
;
2434 sp
->pathmtu
= params
->spp_pathmtu
;
2440 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2441 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2442 trans
->param_flags
=
2443 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2445 sctp_transport_pmtu(trans
, sctp_opt2sk(sp
));
2446 sctp_assoc_sync_pmtu(sctp_opt2sk(sp
), asoc
);
2450 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2453 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2457 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2458 * value of this field is ignored. Note also that a value of zero
2459 * indicates the current setting should be left unchanged.
2461 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2464 msecs_to_jiffies(params
->spp_sackdelay
);
2467 msecs_to_jiffies(params
->spp_sackdelay
);
2469 sp
->sackdelay
= params
->spp_sackdelay
;
2473 if (sackdelay_change
) {
2475 trans
->param_flags
=
2476 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2480 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2484 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2489 /* Note that a value of zero indicates the current setting should be
2492 if (params
->spp_pathmaxrxt
) {
2494 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2496 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2498 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2505 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2506 char __user
*optval
,
2507 unsigned int optlen
)
2509 struct sctp_paddrparams params
;
2510 struct sctp_transport
*trans
= NULL
;
2511 struct sctp_association
*asoc
= NULL
;
2512 struct sctp_sock
*sp
= sctp_sk(sk
);
2514 int hb_change
, pmtud_change
, sackdelay_change
;
2516 if (optlen
!= sizeof(struct sctp_paddrparams
))
2519 if (copy_from_user(¶ms
, optval
, optlen
))
2522 /* Validate flags and value parameters. */
2523 hb_change
= params
.spp_flags
& SPP_HB
;
2524 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2525 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2527 if (hb_change
== SPP_HB
||
2528 pmtud_change
== SPP_PMTUD
||
2529 sackdelay_change
== SPP_SACKDELAY
||
2530 params
.spp_sackdelay
> 500 ||
2531 (params
.spp_pathmtu
&&
2532 params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2535 /* If an address other than INADDR_ANY is specified, and
2536 * no transport is found, then the request is invalid.
2538 if (!sctp_is_any(sk
, (union sctp_addr
*)¶ms
.spp_address
)) {
2539 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2540 params
.spp_assoc_id
);
2545 /* Get association, if assoc_id != 0 and the socket is a one
2546 * to many style socket, and an association was not found, then
2547 * the id was invalid.
2549 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2550 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2553 /* Heartbeat demand can only be sent on a transport or
2554 * association, but not a socket.
2556 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2559 /* Process parameters. */
2560 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2561 hb_change
, pmtud_change
,
2567 /* If changes are for association, also apply parameters to each
2570 if (!trans
&& asoc
) {
2571 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2573 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2574 hb_change
, pmtud_change
,
2582 static inline __u32
sctp_spp_sackdelay_enable(__u32 param_flags
)
2584 return (param_flags
& ~SPP_SACKDELAY
) | SPP_SACKDELAY_ENABLE
;
2587 static inline __u32
sctp_spp_sackdelay_disable(__u32 param_flags
)
2589 return (param_flags
& ~SPP_SACKDELAY
) | SPP_SACKDELAY_DISABLE
;
2593 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2595 * This option will effect the way delayed acks are performed. This
2596 * option allows you to get or set the delayed ack time, in
2597 * milliseconds. It also allows changing the delayed ack frequency.
2598 * Changing the frequency to 1 disables the delayed sack algorithm. If
2599 * the assoc_id is 0, then this sets or gets the endpoints default
2600 * values. If the assoc_id field is non-zero, then the set or get
2601 * effects the specified association for the one to many model (the
2602 * assoc_id field is ignored by the one to one model). Note that if
2603 * sack_delay or sack_freq are 0 when setting this option, then the
2604 * current values will remain unchanged.
2606 * struct sctp_sack_info {
2607 * sctp_assoc_t sack_assoc_id;
2608 * uint32_t sack_delay;
2609 * uint32_t sack_freq;
2612 * sack_assoc_id - This parameter, indicates which association the user
2613 * is performing an action upon. Note that if this field's value is
2614 * zero then the endpoints default value is changed (effecting future
2615 * associations only).
2617 * sack_delay - This parameter contains the number of milliseconds that
2618 * the user is requesting the delayed ACK timer be set to. Note that
2619 * this value is defined in the standard to be between 200 and 500
2622 * sack_freq - This parameter contains the number of packets that must
2623 * be received before a sack is sent without waiting for the delay
2624 * timer to expire. The default value for this is 2, setting this
2625 * value to 1 will disable the delayed sack algorithm.
2628 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2629 char __user
*optval
, unsigned int optlen
)
2631 struct sctp_sack_info params
;
2632 struct sctp_transport
*trans
= NULL
;
2633 struct sctp_association
*asoc
= NULL
;
2634 struct sctp_sock
*sp
= sctp_sk(sk
);
2636 if (optlen
== sizeof(struct sctp_sack_info
)) {
2637 if (copy_from_user(¶ms
, optval
, optlen
))
2640 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2642 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2643 pr_warn_ratelimited(DEPRECATED
2645 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2646 "Use struct sctp_sack_info instead\n",
2647 current
->comm
, task_pid_nr(current
));
2648 if (copy_from_user(¶ms
, optval
, optlen
))
2651 if (params
.sack_delay
== 0)
2652 params
.sack_freq
= 1;
2654 params
.sack_freq
= 0;
2658 /* Validate value parameter. */
2659 if (params
.sack_delay
> 500)
2662 /* Get association, if sack_assoc_id != 0 and the socket is a one
2663 * to many style socket, and an association was not found, then
2664 * the id was invalid.
2666 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2667 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2670 if (params
.sack_delay
) {
2673 msecs_to_jiffies(params
.sack_delay
);
2675 sctp_spp_sackdelay_enable(asoc
->param_flags
);
2677 sp
->sackdelay
= params
.sack_delay
;
2679 sctp_spp_sackdelay_enable(sp
->param_flags
);
2683 if (params
.sack_freq
== 1) {
2686 sctp_spp_sackdelay_disable(asoc
->param_flags
);
2689 sctp_spp_sackdelay_disable(sp
->param_flags
);
2691 } else if (params
.sack_freq
> 1) {
2693 asoc
->sackfreq
= params
.sack_freq
;
2695 sctp_spp_sackdelay_enable(asoc
->param_flags
);
2697 sp
->sackfreq
= params
.sack_freq
;
2699 sctp_spp_sackdelay_enable(sp
->param_flags
);
2703 /* If change is for association, also apply to each transport. */
2705 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2707 if (params
.sack_delay
) {
2709 msecs_to_jiffies(params
.sack_delay
);
2710 trans
->param_flags
=
2711 sctp_spp_sackdelay_enable(trans
->param_flags
);
2713 if (params
.sack_freq
== 1) {
2714 trans
->param_flags
=
2715 sctp_spp_sackdelay_disable(trans
->param_flags
);
2716 } else if (params
.sack_freq
> 1) {
2717 trans
->sackfreq
= params
.sack_freq
;
2718 trans
->param_flags
=
2719 sctp_spp_sackdelay_enable(trans
->param_flags
);
2727 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2729 * Applications can specify protocol parameters for the default association
2730 * initialization. The option name argument to setsockopt() and getsockopt()
2733 * Setting initialization parameters is effective only on an unconnected
2734 * socket (for UDP-style sockets only future associations are effected
2735 * by the change). With TCP-style sockets, this option is inherited by
2736 * sockets derived from a listener socket.
2738 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2740 struct sctp_initmsg sinit
;
2741 struct sctp_sock
*sp
= sctp_sk(sk
);
2743 if (optlen
!= sizeof(struct sctp_initmsg
))
2745 if (copy_from_user(&sinit
, optval
, optlen
))
2748 if (sinit
.sinit_num_ostreams
)
2749 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2750 if (sinit
.sinit_max_instreams
)
2751 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2752 if (sinit
.sinit_max_attempts
)
2753 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2754 if (sinit
.sinit_max_init_timeo
)
2755 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2761 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2763 * Applications that wish to use the sendto() system call may wish to
2764 * specify a default set of parameters that would normally be supplied
2765 * through the inclusion of ancillary data. This socket option allows
2766 * such an application to set the default sctp_sndrcvinfo structure.
2767 * The application that wishes to use this socket option simply passes
2768 * in to this call the sctp_sndrcvinfo structure defined in Section
2769 * 5.2.2) The input parameters accepted by this call include
2770 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2771 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2772 * to this call if the caller is using the UDP model.
2774 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2775 char __user
*optval
,
2776 unsigned int optlen
)
2778 struct sctp_sock
*sp
= sctp_sk(sk
);
2779 struct sctp_association
*asoc
;
2780 struct sctp_sndrcvinfo info
;
2782 if (optlen
!= sizeof(info
))
2784 if (copy_from_user(&info
, optval
, optlen
))
2786 if (info
.sinfo_flags
&
2787 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
2788 SCTP_ABORT
| SCTP_EOF
))
2791 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2792 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2795 asoc
->default_stream
= info
.sinfo_stream
;
2796 asoc
->default_flags
= info
.sinfo_flags
;
2797 asoc
->default_ppid
= info
.sinfo_ppid
;
2798 asoc
->default_context
= info
.sinfo_context
;
2799 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2801 sp
->default_stream
= info
.sinfo_stream
;
2802 sp
->default_flags
= info
.sinfo_flags
;
2803 sp
->default_ppid
= info
.sinfo_ppid
;
2804 sp
->default_context
= info
.sinfo_context
;
2805 sp
->default_timetolive
= info
.sinfo_timetolive
;
2811 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2812 * (SCTP_DEFAULT_SNDINFO)
2814 static int sctp_setsockopt_default_sndinfo(struct sock
*sk
,
2815 char __user
*optval
,
2816 unsigned int optlen
)
2818 struct sctp_sock
*sp
= sctp_sk(sk
);
2819 struct sctp_association
*asoc
;
2820 struct sctp_sndinfo info
;
2822 if (optlen
!= sizeof(info
))
2824 if (copy_from_user(&info
, optval
, optlen
))
2826 if (info
.snd_flags
&
2827 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
2828 SCTP_ABORT
| SCTP_EOF
))
2831 asoc
= sctp_id2assoc(sk
, info
.snd_assoc_id
);
2832 if (!asoc
&& info
.snd_assoc_id
&& sctp_style(sk
, UDP
))
2835 asoc
->default_stream
= info
.snd_sid
;
2836 asoc
->default_flags
= info
.snd_flags
;
2837 asoc
->default_ppid
= info
.snd_ppid
;
2838 asoc
->default_context
= info
.snd_context
;
2840 sp
->default_stream
= info
.snd_sid
;
2841 sp
->default_flags
= info
.snd_flags
;
2842 sp
->default_ppid
= info
.snd_ppid
;
2843 sp
->default_context
= info
.snd_context
;
2849 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2851 * Requests that the local SCTP stack use the enclosed peer address as
2852 * the association primary. The enclosed address must be one of the
2853 * association peer's addresses.
2855 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2856 unsigned int optlen
)
2858 struct sctp_prim prim
;
2859 struct sctp_transport
*trans
;
2861 if (optlen
!= sizeof(struct sctp_prim
))
2864 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2867 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2871 sctp_assoc_set_primary(trans
->asoc
, trans
);
2877 * 7.1.5 SCTP_NODELAY
2879 * Turn on/off any Nagle-like algorithm. This means that packets are
2880 * generally sent as soon as possible and no unnecessary delays are
2881 * introduced, at the cost of more packets in the network. Expects an
2882 * integer boolean flag.
2884 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2885 unsigned int optlen
)
2889 if (optlen
< sizeof(int))
2891 if (get_user(val
, (int __user
*)optval
))
2894 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2900 * 7.1.1 SCTP_RTOINFO
2902 * The protocol parameters used to initialize and bound retransmission
2903 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2904 * and modify these parameters.
2905 * All parameters are time values, in milliseconds. A value of 0, when
2906 * modifying the parameters, indicates that the current value should not
2910 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2912 struct sctp_rtoinfo rtoinfo
;
2913 struct sctp_association
*asoc
;
2914 unsigned long rto_min
, rto_max
;
2915 struct sctp_sock
*sp
= sctp_sk(sk
);
2917 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2920 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2923 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2925 /* Set the values to the specific association */
2926 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2929 rto_max
= rtoinfo
.srto_max
;
2930 rto_min
= rtoinfo
.srto_min
;
2933 rto_max
= asoc
? msecs_to_jiffies(rto_max
) : rto_max
;
2935 rto_max
= asoc
? asoc
->rto_max
: sp
->rtoinfo
.srto_max
;
2938 rto_min
= asoc
? msecs_to_jiffies(rto_min
) : rto_min
;
2940 rto_min
= asoc
? asoc
->rto_min
: sp
->rtoinfo
.srto_min
;
2942 if (rto_min
> rto_max
)
2946 if (rtoinfo
.srto_initial
!= 0)
2948 msecs_to_jiffies(rtoinfo
.srto_initial
);
2949 asoc
->rto_max
= rto_max
;
2950 asoc
->rto_min
= rto_min
;
2952 /* If there is no association or the association-id = 0
2953 * set the values to the endpoint.
2955 if (rtoinfo
.srto_initial
!= 0)
2956 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2957 sp
->rtoinfo
.srto_max
= rto_max
;
2958 sp
->rtoinfo
.srto_min
= rto_min
;
2966 * 7.1.2 SCTP_ASSOCINFO
2968 * This option is used to tune the maximum retransmission attempts
2969 * of the association.
2970 * Returns an error if the new association retransmission value is
2971 * greater than the sum of the retransmission value of the peer.
2972 * See [SCTP] for more information.
2975 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2978 struct sctp_assocparams assocparams
;
2979 struct sctp_association
*asoc
;
2981 if (optlen
!= sizeof(struct sctp_assocparams
))
2983 if (copy_from_user(&assocparams
, optval
, optlen
))
2986 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2988 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2991 /* Set the values to the specific association */
2993 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2996 struct sctp_transport
*peer_addr
;
2998 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
3000 path_sum
+= peer_addr
->pathmaxrxt
;
3004 /* Only validate asocmaxrxt if we have more than
3005 * one path/transport. We do this because path
3006 * retransmissions are only counted when we have more
3010 assocparams
.sasoc_asocmaxrxt
> path_sum
)
3013 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
3016 if (assocparams
.sasoc_cookie_life
!= 0)
3017 asoc
->cookie_life
= ms_to_ktime(assocparams
.sasoc_cookie_life
);
3019 /* Set the values to the endpoint */
3020 struct sctp_sock
*sp
= sctp_sk(sk
);
3022 if (assocparams
.sasoc_asocmaxrxt
!= 0)
3023 sp
->assocparams
.sasoc_asocmaxrxt
=
3024 assocparams
.sasoc_asocmaxrxt
;
3025 if (assocparams
.sasoc_cookie_life
!= 0)
3026 sp
->assocparams
.sasoc_cookie_life
=
3027 assocparams
.sasoc_cookie_life
;
3033 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3035 * This socket option is a boolean flag which turns on or off mapped V4
3036 * addresses. If this option is turned on and the socket is type
3037 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3038 * If this option is turned off, then no mapping will be done of V4
3039 * addresses and a user will receive both PF_INET6 and PF_INET type
3040 * addresses on the socket.
3042 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
3045 struct sctp_sock
*sp
= sctp_sk(sk
);
3047 if (optlen
< sizeof(int))
3049 if (get_user(val
, (int __user
*)optval
))
3060 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3061 * This option will get or set the maximum size to put in any outgoing
3062 * SCTP DATA chunk. If a message is larger than this size it will be
3063 * fragmented by SCTP into the specified size. Note that the underlying
3064 * SCTP implementation may fragment into smaller sized chunks when the
3065 * PMTU of the underlying association is smaller than the value set by
3066 * the user. The default value for this option is '0' which indicates
3067 * the user is NOT limiting fragmentation and only the PMTU will effect
3068 * SCTP's choice of DATA chunk size. Note also that values set larger
3069 * than the maximum size of an IP datagram will effectively let SCTP
3070 * control fragmentation (i.e. the same as setting this option to 0).
3072 * The following structure is used to access and modify this parameter:
3074 * struct sctp_assoc_value {
3075 * sctp_assoc_t assoc_id;
3076 * uint32_t assoc_value;
3079 * assoc_id: This parameter is ignored for one-to-one style sockets.
3080 * For one-to-many style sockets this parameter indicates which
3081 * association the user is performing an action upon. Note that if
3082 * this field's value is zero then the endpoints default value is
3083 * changed (effecting future associations only).
3084 * assoc_value: This parameter specifies the maximum size in bytes.
3086 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
3088 struct sctp_assoc_value params
;
3089 struct sctp_association
*asoc
;
3090 struct sctp_sock
*sp
= sctp_sk(sk
);
3093 if (optlen
== sizeof(int)) {
3094 pr_warn_ratelimited(DEPRECATED
3096 "Use of int in maxseg socket option.\n"
3097 "Use struct sctp_assoc_value instead\n",
3098 current
->comm
, task_pid_nr(current
));
3099 if (copy_from_user(&val
, optval
, optlen
))
3101 params
.assoc_id
= 0;
3102 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3103 if (copy_from_user(¶ms
, optval
, optlen
))
3105 val
= params
.assoc_value
;
3109 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
3112 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3113 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
3118 val
= asoc
->pathmtu
;
3119 val
-= sp
->pf
->af
->net_header_len
;
3120 val
-= sizeof(struct sctphdr
) +
3121 sizeof(struct sctp_data_chunk
);
3123 asoc
->user_frag
= val
;
3124 asoc
->frag_point
= sctp_frag_point(asoc
, asoc
->pathmtu
);
3126 sp
->user_frag
= val
;
3134 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3136 * Requests that the peer mark the enclosed address as the association
3137 * primary. The enclosed address must be one of the association's
3138 * locally bound addresses. The following structure is used to make a
3139 * set primary request:
3141 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
3142 unsigned int optlen
)
3144 struct net
*net
= sock_net(sk
);
3145 struct sctp_sock
*sp
;
3146 struct sctp_association
*asoc
= NULL
;
3147 struct sctp_setpeerprim prim
;
3148 struct sctp_chunk
*chunk
;
3154 if (!net
->sctp
.addip_enable
)
3157 if (optlen
!= sizeof(struct sctp_setpeerprim
))
3160 if (copy_from_user(&prim
, optval
, optlen
))
3163 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
3167 if (!asoc
->peer
.asconf_capable
)
3170 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
3173 if (!sctp_state(asoc
, ESTABLISHED
))
3176 af
= sctp_get_af_specific(prim
.sspp_addr
.ss_family
);
3180 if (!af
->addr_valid((union sctp_addr
*)&prim
.sspp_addr
, sp
, NULL
))
3181 return -EADDRNOTAVAIL
;
3183 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
3184 return -EADDRNOTAVAIL
;
3186 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3187 chunk
= sctp_make_asconf_set_prim(asoc
,
3188 (union sctp_addr
*)&prim
.sspp_addr
);
3192 err
= sctp_send_asconf(asoc
, chunk
);
3194 pr_debug("%s: we set peer primary addr primitively\n", __func__
);
3199 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
3200 unsigned int optlen
)
3202 struct sctp_setadaptation adaptation
;
3204 if (optlen
!= sizeof(struct sctp_setadaptation
))
3206 if (copy_from_user(&adaptation
, optval
, optlen
))
3209 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
3215 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3217 * The context field in the sctp_sndrcvinfo structure is normally only
3218 * used when a failed message is retrieved holding the value that was
3219 * sent down on the actual send call. This option allows the setting of
3220 * a default context on an association basis that will be received on
3221 * reading messages from the peer. This is especially helpful in the
3222 * one-2-many model for an application to keep some reference to an
3223 * internal state machine that is processing messages on the
3224 * association. Note that the setting of this value only effects
3225 * received messages from the peer and does not effect the value that is
3226 * saved with outbound messages.
3228 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
3229 unsigned int optlen
)
3231 struct sctp_assoc_value params
;
3232 struct sctp_sock
*sp
;
3233 struct sctp_association
*asoc
;
3235 if (optlen
!= sizeof(struct sctp_assoc_value
))
3237 if (copy_from_user(¶ms
, optval
, optlen
))
3242 if (params
.assoc_id
!= 0) {
3243 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3246 asoc
->default_rcv_context
= params
.assoc_value
;
3248 sp
->default_rcv_context
= params
.assoc_value
;
3255 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3257 * This options will at a minimum specify if the implementation is doing
3258 * fragmented interleave. Fragmented interleave, for a one to many
3259 * socket, is when subsequent calls to receive a message may return
3260 * parts of messages from different associations. Some implementations
3261 * may allow you to turn this value on or off. If so, when turned off,
3262 * no fragment interleave will occur (which will cause a head of line
3263 * blocking amongst multiple associations sharing the same one to many
3264 * socket). When this option is turned on, then each receive call may
3265 * come from a different association (thus the user must receive data
3266 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3267 * association each receive belongs to.
3269 * This option takes a boolean value. A non-zero value indicates that
3270 * fragmented interleave is on. A value of zero indicates that
3271 * fragmented interleave is off.
3273 * Note that it is important that an implementation that allows this
3274 * option to be turned on, have it off by default. Otherwise an unaware
3275 * application using the one to many model may become confused and act
3278 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
3279 char __user
*optval
,
3280 unsigned int optlen
)
3284 if (optlen
!= sizeof(int))
3286 if (get_user(val
, (int __user
*)optval
))
3289 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
3295 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3296 * (SCTP_PARTIAL_DELIVERY_POINT)
3298 * This option will set or get the SCTP partial delivery point. This
3299 * point is the size of a message where the partial delivery API will be
3300 * invoked to help free up rwnd space for the peer. Setting this to a
3301 * lower value will cause partial deliveries to happen more often. The
3302 * calls argument is an integer that sets or gets the partial delivery
3303 * point. Note also that the call will fail if the user attempts to set
3304 * this value larger than the socket receive buffer size.
3306 * Note that any single message having a length smaller than or equal to
3307 * the SCTP partial delivery point will be delivered in one single read
3308 * call as long as the user provided buffer is large enough to hold the
3311 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
3312 char __user
*optval
,
3313 unsigned int optlen
)
3317 if (optlen
!= sizeof(u32
))
3319 if (get_user(val
, (int __user
*)optval
))
3322 /* Note: We double the receive buffer from what the user sets
3323 * it to be, also initial rwnd is based on rcvbuf/2.
3325 if (val
> (sk
->sk_rcvbuf
>> 1))
3328 sctp_sk(sk
)->pd_point
= val
;
3330 return 0; /* is this the right error code? */
3334 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3336 * This option will allow a user to change the maximum burst of packets
3337 * that can be emitted by this association. Note that the default value
3338 * is 4, and some implementations may restrict this setting so that it
3339 * can only be lowered.
3341 * NOTE: This text doesn't seem right. Do this on a socket basis with
3342 * future associations inheriting the socket value.
3344 static int sctp_setsockopt_maxburst(struct sock
*sk
,
3345 char __user
*optval
,
3346 unsigned int optlen
)
3348 struct sctp_assoc_value params
;
3349 struct sctp_sock
*sp
;
3350 struct sctp_association
*asoc
;
3354 if (optlen
== sizeof(int)) {
3355 pr_warn_ratelimited(DEPRECATED
3357 "Use of int in max_burst socket option deprecated.\n"
3358 "Use struct sctp_assoc_value instead\n",
3359 current
->comm
, task_pid_nr(current
));
3360 if (copy_from_user(&val
, optval
, optlen
))
3362 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3363 if (copy_from_user(¶ms
, optval
, optlen
))
3365 val
= params
.assoc_value
;
3366 assoc_id
= params
.assoc_id
;
3372 if (assoc_id
!= 0) {
3373 asoc
= sctp_id2assoc(sk
, assoc_id
);
3376 asoc
->max_burst
= val
;
3378 sp
->max_burst
= val
;
3384 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3386 * This set option adds a chunk type that the user is requesting to be
3387 * received only in an authenticated way. Changes to the list of chunks
3388 * will only effect future associations on the socket.
3390 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
3391 char __user
*optval
,
3392 unsigned int optlen
)
3394 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3395 struct sctp_authchunk val
;
3397 if (!ep
->auth_enable
)
3400 if (optlen
!= sizeof(struct sctp_authchunk
))
3402 if (copy_from_user(&val
, optval
, optlen
))
3405 switch (val
.sauth_chunk
) {
3407 case SCTP_CID_INIT_ACK
:
3408 case SCTP_CID_SHUTDOWN_COMPLETE
:
3413 /* add this chunk id to the endpoint */
3414 return sctp_auth_ep_add_chunkid(ep
, val
.sauth_chunk
);
3418 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3420 * This option gets or sets the list of HMAC algorithms that the local
3421 * endpoint requires the peer to use.
3423 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
3424 char __user
*optval
,
3425 unsigned int optlen
)
3427 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3428 struct sctp_hmacalgo
*hmacs
;
3432 if (!ep
->auth_enable
)
3435 if (optlen
< sizeof(struct sctp_hmacalgo
))
3438 hmacs
= memdup_user(optval
, optlen
);
3440 return PTR_ERR(hmacs
);
3442 idents
= hmacs
->shmac_num_idents
;
3443 if (idents
== 0 || idents
> SCTP_AUTH_NUM_HMACS
||
3444 (idents
* sizeof(u16
)) > (optlen
- sizeof(struct sctp_hmacalgo
))) {
3449 err
= sctp_auth_ep_set_hmacs(ep
, hmacs
);
3456 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3458 * This option will set a shared secret key which is used to build an
3459 * association shared key.
3461 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3462 char __user
*optval
,
3463 unsigned int optlen
)
3465 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3466 struct sctp_authkey
*authkey
;
3467 struct sctp_association
*asoc
;
3470 if (!ep
->auth_enable
)
3473 if (optlen
<= sizeof(struct sctp_authkey
))
3476 authkey
= memdup_user(optval
, optlen
);
3477 if (IS_ERR(authkey
))
3478 return PTR_ERR(authkey
);
3480 if (authkey
->sca_keylength
> optlen
- sizeof(struct sctp_authkey
)) {
3485 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3486 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3491 ret
= sctp_auth_set_key(ep
, asoc
, authkey
);
3498 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3500 * This option will get or set the active shared key to be used to build
3501 * the association shared key.
3503 static int sctp_setsockopt_active_key(struct sock
*sk
,
3504 char __user
*optval
,
3505 unsigned int optlen
)
3507 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3508 struct sctp_authkeyid val
;
3509 struct sctp_association
*asoc
;
3511 if (!ep
->auth_enable
)
3514 if (optlen
!= sizeof(struct sctp_authkeyid
))
3516 if (copy_from_user(&val
, optval
, optlen
))
3519 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3520 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3523 return sctp_auth_set_active_key(ep
, asoc
, val
.scact_keynumber
);
3527 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3529 * This set option will delete a shared secret key from use.
3531 static int sctp_setsockopt_del_key(struct sock
*sk
,
3532 char __user
*optval
,
3533 unsigned int optlen
)
3535 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3536 struct sctp_authkeyid val
;
3537 struct sctp_association
*asoc
;
3539 if (!ep
->auth_enable
)
3542 if (optlen
!= sizeof(struct sctp_authkeyid
))
3544 if (copy_from_user(&val
, optval
, optlen
))
3547 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3548 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3551 return sctp_auth_del_key_id(ep
, asoc
, val
.scact_keynumber
);
3556 * 8.1.23 SCTP_AUTO_ASCONF
3558 * This option will enable or disable the use of the automatic generation of
3559 * ASCONF chunks to add and delete addresses to an existing association. Note
3560 * that this option has two caveats namely: a) it only affects sockets that
3561 * are bound to all addresses available to the SCTP stack, and b) the system
3562 * administrator may have an overriding control that turns the ASCONF feature
3563 * off no matter what setting the socket option may have.
3564 * This option expects an integer boolean flag, where a non-zero value turns on
3565 * the option, and a zero value turns off the option.
3566 * Note. In this implementation, socket operation overrides default parameter
3567 * being set by sysctl as well as FreeBSD implementation
3569 static int sctp_setsockopt_auto_asconf(struct sock
*sk
, char __user
*optval
,
3570 unsigned int optlen
)
3573 struct sctp_sock
*sp
= sctp_sk(sk
);
3575 if (optlen
< sizeof(int))
3577 if (get_user(val
, (int __user
*)optval
))
3579 if (!sctp_is_ep_boundall(sk
) && val
)
3581 if ((val
&& sp
->do_auto_asconf
) || (!val
&& !sp
->do_auto_asconf
))
3584 spin_lock_bh(&sock_net(sk
)->sctp
.addr_wq_lock
);
3585 if (val
== 0 && sp
->do_auto_asconf
) {
3586 list_del(&sp
->auto_asconf_list
);
3587 sp
->do_auto_asconf
= 0;
3588 } else if (val
&& !sp
->do_auto_asconf
) {
3589 list_add_tail(&sp
->auto_asconf_list
,
3590 &sock_net(sk
)->sctp
.auto_asconf_splist
);
3591 sp
->do_auto_asconf
= 1;
3593 spin_unlock_bh(&sock_net(sk
)->sctp
.addr_wq_lock
);
3598 * SCTP_PEER_ADDR_THLDS
3600 * This option allows us to alter the partially failed threshold for one or all
3601 * transports in an association. See Section 6.1 of:
3602 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3604 static int sctp_setsockopt_paddr_thresholds(struct sock
*sk
,
3605 char __user
*optval
,
3606 unsigned int optlen
)
3608 struct sctp_paddrthlds val
;
3609 struct sctp_transport
*trans
;
3610 struct sctp_association
*asoc
;
3612 if (optlen
< sizeof(struct sctp_paddrthlds
))
3614 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
,
3615 sizeof(struct sctp_paddrthlds
)))
3619 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
3620 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
3623 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
3625 if (val
.spt_pathmaxrxt
)
3626 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3627 trans
->pf_retrans
= val
.spt_pathpfthld
;
3630 if (val
.spt_pathmaxrxt
)
3631 asoc
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3632 asoc
->pf_retrans
= val
.spt_pathpfthld
;
3634 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
3639 if (val
.spt_pathmaxrxt
)
3640 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3641 trans
->pf_retrans
= val
.spt_pathpfthld
;
3647 static int sctp_setsockopt_recvrcvinfo(struct sock
*sk
,
3648 char __user
*optval
,
3649 unsigned int optlen
)
3653 if (optlen
< sizeof(int))
3655 if (get_user(val
, (int __user
*) optval
))
3658 sctp_sk(sk
)->recvrcvinfo
= (val
== 0) ? 0 : 1;
3663 static int sctp_setsockopt_recvnxtinfo(struct sock
*sk
,
3664 char __user
*optval
,
3665 unsigned int optlen
)
3669 if (optlen
< sizeof(int))
3671 if (get_user(val
, (int __user
*) optval
))
3674 sctp_sk(sk
)->recvnxtinfo
= (val
== 0) ? 0 : 1;
3679 static int sctp_setsockopt_pr_supported(struct sock
*sk
,
3680 char __user
*optval
,
3681 unsigned int optlen
)
3683 struct sctp_assoc_value params
;
3684 struct sctp_association
*asoc
;
3685 int retval
= -EINVAL
;
3687 if (optlen
!= sizeof(params
))
3690 if (copy_from_user(¶ms
, optval
, optlen
)) {
3695 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3697 asoc
->prsctp_enable
= !!params
.assoc_value
;
3698 } else if (!params
.assoc_id
) {
3699 struct sctp_sock
*sp
= sctp_sk(sk
);
3701 sp
->ep
->prsctp_enable
= !!params
.assoc_value
;
3712 static int sctp_setsockopt_default_prinfo(struct sock
*sk
,
3713 char __user
*optval
,
3714 unsigned int optlen
)
3716 struct sctp_default_prinfo info
;
3717 struct sctp_association
*asoc
;
3718 int retval
= -EINVAL
;
3720 if (optlen
!= sizeof(info
))
3723 if (copy_from_user(&info
, optval
, sizeof(info
))) {
3728 if (info
.pr_policy
& ~SCTP_PR_SCTP_MASK
)
3731 if (info
.pr_policy
== SCTP_PR_SCTP_NONE
)
3734 asoc
= sctp_id2assoc(sk
, info
.pr_assoc_id
);
3736 SCTP_PR_SET_POLICY(asoc
->default_flags
, info
.pr_policy
);
3737 asoc
->default_timetolive
= info
.pr_value
;
3738 } else if (!info
.pr_assoc_id
) {
3739 struct sctp_sock
*sp
= sctp_sk(sk
);
3741 SCTP_PR_SET_POLICY(sp
->default_flags
, info
.pr_policy
);
3742 sp
->default_timetolive
= info
.pr_value
;
3753 static int sctp_setsockopt_enable_strreset(struct sock
*sk
,
3754 char __user
*optval
,
3755 unsigned int optlen
)
3757 struct sctp_assoc_value params
;
3758 struct sctp_association
*asoc
;
3759 int retval
= -EINVAL
;
3761 if (optlen
!= sizeof(params
))
3764 if (copy_from_user(¶ms
, optval
, optlen
)) {
3769 if (params
.assoc_value
& (~SCTP_ENABLE_STRRESET_MASK
))
3772 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3774 asoc
->strreset_enable
= params
.assoc_value
;
3775 } else if (!params
.assoc_id
) {
3776 struct sctp_sock
*sp
= sctp_sk(sk
);
3778 sp
->ep
->strreset_enable
= params
.assoc_value
;
3789 static int sctp_setsockopt_reset_streams(struct sock
*sk
,
3790 char __user
*optval
,
3791 unsigned int optlen
)
3793 struct sctp_reset_streams
*params
;
3794 struct sctp_association
*asoc
;
3795 int retval
= -EINVAL
;
3797 if (optlen
< sizeof(struct sctp_reset_streams
))
3800 params
= memdup_user(optval
, optlen
);
3802 return PTR_ERR(params
);
3804 asoc
= sctp_id2assoc(sk
, params
->srs_assoc_id
);
3808 retval
= sctp_send_reset_streams(asoc
, params
);
3815 /* API 6.2 setsockopt(), getsockopt()
3817 * Applications use setsockopt() and getsockopt() to set or retrieve
3818 * socket options. Socket options are used to change the default
3819 * behavior of sockets calls. They are described in Section 7.
3823 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3824 * int __user *optlen);
3825 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3828 * sd - the socket descript.
3829 * level - set to IPPROTO_SCTP for all SCTP options.
3830 * optname - the option name.
3831 * optval - the buffer to store the value of the option.
3832 * optlen - the size of the buffer.
3834 static int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3835 char __user
*optval
, unsigned int optlen
)
3839 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
3841 /* I can hardly begin to describe how wrong this is. This is
3842 * so broken as to be worse than useless. The API draft
3843 * REALLY is NOT helpful here... I am not convinced that the
3844 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3845 * are at all well-founded.
3847 if (level
!= SOL_SCTP
) {
3848 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3849 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3856 case SCTP_SOCKOPT_BINDX_ADD
:
3857 /* 'optlen' is the size of the addresses buffer. */
3858 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3859 optlen
, SCTP_BINDX_ADD_ADDR
);
3862 case SCTP_SOCKOPT_BINDX_REM
:
3863 /* 'optlen' is the size of the addresses buffer. */
3864 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3865 optlen
, SCTP_BINDX_REM_ADDR
);
3868 case SCTP_SOCKOPT_CONNECTX_OLD
:
3869 /* 'optlen' is the size of the addresses buffer. */
3870 retval
= sctp_setsockopt_connectx_old(sk
,
3871 (struct sockaddr __user
*)optval
,
3875 case SCTP_SOCKOPT_CONNECTX
:
3876 /* 'optlen' is the size of the addresses buffer. */
3877 retval
= sctp_setsockopt_connectx(sk
,
3878 (struct sockaddr __user
*)optval
,
3882 case SCTP_DISABLE_FRAGMENTS
:
3883 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3887 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3890 case SCTP_AUTOCLOSE
:
3891 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3894 case SCTP_PEER_ADDR_PARAMS
:
3895 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3898 case SCTP_DELAYED_SACK
:
3899 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3901 case SCTP_PARTIAL_DELIVERY_POINT
:
3902 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3906 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3908 case SCTP_DEFAULT_SEND_PARAM
:
3909 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3912 case SCTP_DEFAULT_SNDINFO
:
3913 retval
= sctp_setsockopt_default_sndinfo(sk
, optval
, optlen
);
3915 case SCTP_PRIMARY_ADDR
:
3916 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3918 case SCTP_SET_PEER_PRIMARY_ADDR
:
3919 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3922 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3925 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3927 case SCTP_ASSOCINFO
:
3928 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3930 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3931 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3934 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3936 case SCTP_ADAPTATION_LAYER
:
3937 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3940 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3942 case SCTP_FRAGMENT_INTERLEAVE
:
3943 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3945 case SCTP_MAX_BURST
:
3946 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3948 case SCTP_AUTH_CHUNK
:
3949 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3951 case SCTP_HMAC_IDENT
:
3952 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3955 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3957 case SCTP_AUTH_ACTIVE_KEY
:
3958 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3960 case SCTP_AUTH_DELETE_KEY
:
3961 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3963 case SCTP_AUTO_ASCONF
:
3964 retval
= sctp_setsockopt_auto_asconf(sk
, optval
, optlen
);
3966 case SCTP_PEER_ADDR_THLDS
:
3967 retval
= sctp_setsockopt_paddr_thresholds(sk
, optval
, optlen
);
3969 case SCTP_RECVRCVINFO
:
3970 retval
= sctp_setsockopt_recvrcvinfo(sk
, optval
, optlen
);
3972 case SCTP_RECVNXTINFO
:
3973 retval
= sctp_setsockopt_recvnxtinfo(sk
, optval
, optlen
);
3975 case SCTP_PR_SUPPORTED
:
3976 retval
= sctp_setsockopt_pr_supported(sk
, optval
, optlen
);
3978 case SCTP_DEFAULT_PRINFO
:
3979 retval
= sctp_setsockopt_default_prinfo(sk
, optval
, optlen
);
3981 case SCTP_ENABLE_STREAM_RESET
:
3982 retval
= sctp_setsockopt_enable_strreset(sk
, optval
, optlen
);
3984 case SCTP_RESET_STREAMS
:
3985 retval
= sctp_setsockopt_reset_streams(sk
, optval
, optlen
);
3988 retval
= -ENOPROTOOPT
;
3998 /* API 3.1.6 connect() - UDP Style Syntax
4000 * An application may use the connect() call in the UDP model to initiate an
4001 * association without sending data.
4005 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4007 * sd: the socket descriptor to have a new association added to.
4009 * nam: the address structure (either struct sockaddr_in or struct
4010 * sockaddr_in6 defined in RFC2553 [7]).
4012 * len: the size of the address.
4014 static int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
4022 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__
, sk
,
4025 /* Validate addr_len before calling common connect/connectx routine. */
4026 af
= sctp_get_af_specific(addr
->sa_family
);
4027 if (!af
|| addr_len
< af
->sockaddr_len
) {
4030 /* Pass correct addr len to common routine (so it knows there
4031 * is only one address being passed.
4033 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
4040 /* FIXME: Write comments. */
4041 static int sctp_disconnect(struct sock
*sk
, int flags
)
4043 return -EOPNOTSUPP
; /* STUB */
4046 /* 4.1.4 accept() - TCP Style Syntax
4048 * Applications use accept() call to remove an established SCTP
4049 * association from the accept queue of the endpoint. A new socket
4050 * descriptor will be returned from accept() to represent the newly
4051 * formed association.
4053 static struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
4055 struct sctp_sock
*sp
;
4056 struct sctp_endpoint
*ep
;
4057 struct sock
*newsk
= NULL
;
4058 struct sctp_association
*asoc
;
4067 if (!sctp_style(sk
, TCP
)) {
4068 error
= -EOPNOTSUPP
;
4072 if (!sctp_sstate(sk
, LISTENING
)) {
4077 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
4079 error
= sctp_wait_for_accept(sk
, timeo
);
4083 /* We treat the list of associations on the endpoint as the accept
4084 * queue and pick the first association on the list.
4086 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
4088 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
4094 /* Populate the fields of the newsk from the oldsk and migrate the
4095 * asoc to the newsk.
4097 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
4105 /* The SCTP ioctl handler. */
4106 static int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
4113 * SEQPACKET-style sockets in LISTENING state are valid, for
4114 * SCTP, so only discard TCP-style sockets in LISTENING state.
4116 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
4121 struct sk_buff
*skb
;
4122 unsigned int amount
= 0;
4124 skb
= skb_peek(&sk
->sk_receive_queue
);
4127 * We will only return the amount of this packet since
4128 * that is all that will be read.
4132 rc
= put_user(amount
, (int __user
*)arg
);
4144 /* This is the function which gets called during socket creation to
4145 * initialized the SCTP-specific portion of the sock.
4146 * The sock structure should already be zero-filled memory.
4148 static int sctp_init_sock(struct sock
*sk
)
4150 struct net
*net
= sock_net(sk
);
4151 struct sctp_sock
*sp
;
4153 pr_debug("%s: sk:%p\n", __func__
, sk
);
4157 /* Initialize the SCTP per socket area. */
4158 switch (sk
->sk_type
) {
4159 case SOCK_SEQPACKET
:
4160 sp
->type
= SCTP_SOCKET_UDP
;
4163 sp
->type
= SCTP_SOCKET_TCP
;
4166 return -ESOCKTNOSUPPORT
;
4169 sk
->sk_gso_type
= SKB_GSO_SCTP
;
4171 /* Initialize default send parameters. These parameters can be
4172 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4174 sp
->default_stream
= 0;
4175 sp
->default_ppid
= 0;
4176 sp
->default_flags
= 0;
4177 sp
->default_context
= 0;
4178 sp
->default_timetolive
= 0;
4180 sp
->default_rcv_context
= 0;
4181 sp
->max_burst
= net
->sctp
.max_burst
;
4183 sp
->sctp_hmac_alg
= net
->sctp
.sctp_hmac_alg
;
4185 /* Initialize default setup parameters. These parameters
4186 * can be modified with the SCTP_INITMSG socket option or
4187 * overridden by the SCTP_INIT CMSG.
4189 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
4190 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
4191 sp
->initmsg
.sinit_max_attempts
= net
->sctp
.max_retrans_init
;
4192 sp
->initmsg
.sinit_max_init_timeo
= net
->sctp
.rto_max
;
4194 /* Initialize default RTO related parameters. These parameters can
4195 * be modified for with the SCTP_RTOINFO socket option.
4197 sp
->rtoinfo
.srto_initial
= net
->sctp
.rto_initial
;
4198 sp
->rtoinfo
.srto_max
= net
->sctp
.rto_max
;
4199 sp
->rtoinfo
.srto_min
= net
->sctp
.rto_min
;
4201 /* Initialize default association related parameters. These parameters
4202 * can be modified with the SCTP_ASSOCINFO socket option.
4204 sp
->assocparams
.sasoc_asocmaxrxt
= net
->sctp
.max_retrans_association
;
4205 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
4206 sp
->assocparams
.sasoc_peer_rwnd
= 0;
4207 sp
->assocparams
.sasoc_local_rwnd
= 0;
4208 sp
->assocparams
.sasoc_cookie_life
= net
->sctp
.valid_cookie_life
;
4210 /* Initialize default event subscriptions. By default, all the
4213 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
4215 /* Default Peer Address Parameters. These defaults can
4216 * be modified via SCTP_PEER_ADDR_PARAMS
4218 sp
->hbinterval
= net
->sctp
.hb_interval
;
4219 sp
->pathmaxrxt
= net
->sctp
.max_retrans_path
;
4220 sp
->pathmtu
= 0; /* allow default discovery */
4221 sp
->sackdelay
= net
->sctp
.sack_timeout
;
4223 sp
->param_flags
= SPP_HB_ENABLE
|
4225 SPP_SACKDELAY_ENABLE
;
4227 /* If enabled no SCTP message fragmentation will be performed.
4228 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4230 sp
->disable_fragments
= 0;
4232 /* Enable Nagle algorithm by default. */
4235 sp
->recvrcvinfo
= 0;
4236 sp
->recvnxtinfo
= 0;
4238 /* Enable by default. */
4241 /* Auto-close idle associations after the configured
4242 * number of seconds. A value of 0 disables this
4243 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4244 * for UDP-style sockets only.
4248 /* User specified fragmentation limit. */
4251 sp
->adaptation_ind
= 0;
4253 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
4255 /* Control variables for partial data delivery. */
4256 atomic_set(&sp
->pd_mode
, 0);
4257 skb_queue_head_init(&sp
->pd_lobby
);
4258 sp
->frag_interleave
= 0;
4260 /* Create a per socket endpoint structure. Even if we
4261 * change the data structure relationships, this may still
4262 * be useful for storing pre-connect address information.
4264 sp
->ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
4270 sk
->sk_destruct
= sctp_destruct_sock
;
4272 SCTP_DBG_OBJCNT_INC(sock
);
4275 percpu_counter_inc(&sctp_sockets_allocated
);
4276 sock_prot_inuse_add(net
, sk
->sk_prot
, 1);
4278 /* Nothing can fail after this block, otherwise
4279 * sctp_destroy_sock() will be called without addr_wq_lock held
4281 if (net
->sctp
.default_auto_asconf
) {
4282 spin_lock(&sock_net(sk
)->sctp
.addr_wq_lock
);
4283 list_add_tail(&sp
->auto_asconf_list
,
4284 &net
->sctp
.auto_asconf_splist
);
4285 sp
->do_auto_asconf
= 1;
4286 spin_unlock(&sock_net(sk
)->sctp
.addr_wq_lock
);
4288 sp
->do_auto_asconf
= 0;
4296 /* Cleanup any SCTP per socket resources. Must be called with
4297 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4299 static void sctp_destroy_sock(struct sock
*sk
)
4301 struct sctp_sock
*sp
;
4303 pr_debug("%s: sk:%p\n", __func__
, sk
);
4305 /* Release our hold on the endpoint. */
4307 /* This could happen during socket init, thus we bail out
4308 * early, since the rest of the below is not setup either.
4313 if (sp
->do_auto_asconf
) {
4314 sp
->do_auto_asconf
= 0;
4315 list_del(&sp
->auto_asconf_list
);
4317 sctp_endpoint_free(sp
->ep
);
4319 percpu_counter_dec(&sctp_sockets_allocated
);
4320 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
4324 /* Triggered when there are no references on the socket anymore */
4325 static void sctp_destruct_sock(struct sock
*sk
)
4327 struct sctp_sock
*sp
= sctp_sk(sk
);
4329 /* Free up the HMAC transform. */
4330 crypto_free_shash(sp
->hmac
);
4332 inet_sock_destruct(sk
);
4335 /* API 4.1.7 shutdown() - TCP Style Syntax
4336 * int shutdown(int socket, int how);
4338 * sd - the socket descriptor of the association to be closed.
4339 * how - Specifies the type of shutdown. The values are
4342 * Disables further receive operations. No SCTP
4343 * protocol action is taken.
4345 * Disables further send operations, and initiates
4346 * the SCTP shutdown sequence.
4348 * Disables further send and receive operations
4349 * and initiates the SCTP shutdown sequence.
4351 static void sctp_shutdown(struct sock
*sk
, int how
)
4353 struct net
*net
= sock_net(sk
);
4354 struct sctp_endpoint
*ep
;
4356 if (!sctp_style(sk
, TCP
))
4359 ep
= sctp_sk(sk
)->ep
;
4360 if (how
& SEND_SHUTDOWN
&& !list_empty(&ep
->asocs
)) {
4361 struct sctp_association
*asoc
;
4363 sk
->sk_state
= SCTP_SS_CLOSING
;
4364 asoc
= list_entry(ep
->asocs
.next
,
4365 struct sctp_association
, asocs
);
4366 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
4370 int sctp_get_sctp_info(struct sock
*sk
, struct sctp_association
*asoc
,
4371 struct sctp_info
*info
)
4373 struct sctp_transport
*prim
;
4374 struct list_head
*pos
;
4377 memset(info
, 0, sizeof(*info
));
4379 struct sctp_sock
*sp
= sctp_sk(sk
);
4381 info
->sctpi_s_autoclose
= sp
->autoclose
;
4382 info
->sctpi_s_adaptation_ind
= sp
->adaptation_ind
;
4383 info
->sctpi_s_pd_point
= sp
->pd_point
;
4384 info
->sctpi_s_nodelay
= sp
->nodelay
;
4385 info
->sctpi_s_disable_fragments
= sp
->disable_fragments
;
4386 info
->sctpi_s_v4mapped
= sp
->v4mapped
;
4387 info
->sctpi_s_frag_interleave
= sp
->frag_interleave
;
4388 info
->sctpi_s_type
= sp
->type
;
4393 info
->sctpi_tag
= asoc
->c
.my_vtag
;
4394 info
->sctpi_state
= asoc
->state
;
4395 info
->sctpi_rwnd
= asoc
->a_rwnd
;
4396 info
->sctpi_unackdata
= asoc
->unack_data
;
4397 info
->sctpi_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4398 info
->sctpi_instrms
= asoc
->c
.sinit_max_instreams
;
4399 info
->sctpi_outstrms
= asoc
->c
.sinit_num_ostreams
;
4400 list_for_each(pos
, &asoc
->base
.inqueue
.in_chunk_list
)
4401 info
->sctpi_inqueue
++;
4402 list_for_each(pos
, &asoc
->outqueue
.out_chunk_list
)
4403 info
->sctpi_outqueue
++;
4404 info
->sctpi_overall_error
= asoc
->overall_error_count
;
4405 info
->sctpi_max_burst
= asoc
->max_burst
;
4406 info
->sctpi_maxseg
= asoc
->frag_point
;
4407 info
->sctpi_peer_rwnd
= asoc
->peer
.rwnd
;
4408 info
->sctpi_peer_tag
= asoc
->c
.peer_vtag
;
4410 mask
= asoc
->peer
.ecn_capable
<< 1;
4411 mask
= (mask
| asoc
->peer
.ipv4_address
) << 1;
4412 mask
= (mask
| asoc
->peer
.ipv6_address
) << 1;
4413 mask
= (mask
| asoc
->peer
.hostname_address
) << 1;
4414 mask
= (mask
| asoc
->peer
.asconf_capable
) << 1;
4415 mask
= (mask
| asoc
->peer
.prsctp_capable
) << 1;
4416 mask
= (mask
| asoc
->peer
.auth_capable
);
4417 info
->sctpi_peer_capable
= mask
;
4418 mask
= asoc
->peer
.sack_needed
<< 1;
4419 mask
= (mask
| asoc
->peer
.sack_generation
) << 1;
4420 mask
= (mask
| asoc
->peer
.zero_window_announced
);
4421 info
->sctpi_peer_sack
= mask
;
4423 info
->sctpi_isacks
= asoc
->stats
.isacks
;
4424 info
->sctpi_osacks
= asoc
->stats
.osacks
;
4425 info
->sctpi_opackets
= asoc
->stats
.opackets
;
4426 info
->sctpi_ipackets
= asoc
->stats
.ipackets
;
4427 info
->sctpi_rtxchunks
= asoc
->stats
.rtxchunks
;
4428 info
->sctpi_outofseqtsns
= asoc
->stats
.outofseqtsns
;
4429 info
->sctpi_idupchunks
= asoc
->stats
.idupchunks
;
4430 info
->sctpi_gapcnt
= asoc
->stats
.gapcnt
;
4431 info
->sctpi_ouodchunks
= asoc
->stats
.ouodchunks
;
4432 info
->sctpi_iuodchunks
= asoc
->stats
.iuodchunks
;
4433 info
->sctpi_oodchunks
= asoc
->stats
.oodchunks
;
4434 info
->sctpi_iodchunks
= asoc
->stats
.iodchunks
;
4435 info
->sctpi_octrlchunks
= asoc
->stats
.octrlchunks
;
4436 info
->sctpi_ictrlchunks
= asoc
->stats
.ictrlchunks
;
4438 prim
= asoc
->peer
.primary_path
;
4439 memcpy(&info
->sctpi_p_address
, &prim
->ipaddr
,
4440 sizeof(struct sockaddr_storage
));
4441 info
->sctpi_p_state
= prim
->state
;
4442 info
->sctpi_p_cwnd
= prim
->cwnd
;
4443 info
->sctpi_p_srtt
= prim
->srtt
;
4444 info
->sctpi_p_rto
= jiffies_to_msecs(prim
->rto
);
4445 info
->sctpi_p_hbinterval
= prim
->hbinterval
;
4446 info
->sctpi_p_pathmaxrxt
= prim
->pathmaxrxt
;
4447 info
->sctpi_p_sackdelay
= jiffies_to_msecs(prim
->sackdelay
);
4448 info
->sctpi_p_ssthresh
= prim
->ssthresh
;
4449 info
->sctpi_p_partial_bytes_acked
= prim
->partial_bytes_acked
;
4450 info
->sctpi_p_flight_size
= prim
->flight_size
;
4451 info
->sctpi_p_error
= prim
->error_count
;
4455 EXPORT_SYMBOL_GPL(sctp_get_sctp_info
);
4457 /* use callback to avoid exporting the core structure */
4458 int sctp_transport_walk_start(struct rhashtable_iter
*iter
)
4462 rhltable_walk_enter(&sctp_transport_hashtable
, iter
);
4464 err
= rhashtable_walk_start(iter
);
4465 if (err
&& err
!= -EAGAIN
) {
4466 rhashtable_walk_stop(iter
);
4467 rhashtable_walk_exit(iter
);
4474 void sctp_transport_walk_stop(struct rhashtable_iter
*iter
)
4476 rhashtable_walk_stop(iter
);
4477 rhashtable_walk_exit(iter
);
4480 struct sctp_transport
*sctp_transport_get_next(struct net
*net
,
4481 struct rhashtable_iter
*iter
)
4483 struct sctp_transport
*t
;
4485 t
= rhashtable_walk_next(iter
);
4486 for (; t
; t
= rhashtable_walk_next(iter
)) {
4488 if (PTR_ERR(t
) == -EAGAIN
)
4493 if (net_eq(sock_net(t
->asoc
->base
.sk
), net
) &&
4494 t
->asoc
->peer
.primary_path
== t
)
4501 struct sctp_transport
*sctp_transport_get_idx(struct net
*net
,
4502 struct rhashtable_iter
*iter
,
4505 void *obj
= SEQ_START_TOKEN
;
4507 while (pos
&& (obj
= sctp_transport_get_next(net
, iter
)) &&
4514 int sctp_for_each_endpoint(int (*cb
)(struct sctp_endpoint
*, void *),
4518 struct sctp_ep_common
*epb
;
4519 struct sctp_hashbucket
*head
;
4521 for (head
= sctp_ep_hashtable
; hash
< sctp_ep_hashsize
;
4523 read_lock(&head
->lock
);
4524 sctp_for_each_hentry(epb
, &head
->chain
) {
4525 err
= cb(sctp_ep(epb
), p
);
4529 read_unlock(&head
->lock
);
4534 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint
);
4536 int sctp_transport_lookup_process(int (*cb
)(struct sctp_transport
*, void *),
4538 const union sctp_addr
*laddr
,
4539 const union sctp_addr
*paddr
, void *p
)
4541 struct sctp_transport
*transport
;
4545 transport
= sctp_addrs_lookup_transport(net
, laddr
, paddr
);
4550 err
= cb(transport
, p
);
4551 sctp_transport_put(transport
);
4555 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process
);
4557 int sctp_for_each_transport(int (*cb
)(struct sctp_transport
*, void *),
4558 struct net
*net
, int pos
, void *p
) {
4559 struct rhashtable_iter hti
;
4563 err
= sctp_transport_walk_start(&hti
);
4567 sctp_transport_get_idx(net
, &hti
, pos
);
4568 obj
= sctp_transport_get_next(net
, &hti
);
4569 for (; obj
&& !IS_ERR(obj
); obj
= sctp_transport_get_next(net
, &hti
)) {
4570 struct sctp_transport
*transport
= obj
;
4572 if (!sctp_transport_hold(transport
))
4574 err
= cb(transport
, p
);
4575 sctp_transport_put(transport
);
4579 sctp_transport_walk_stop(&hti
);
4583 EXPORT_SYMBOL_GPL(sctp_for_each_transport
);
4585 /* 7.2.1 Association Status (SCTP_STATUS)
4587 * Applications can retrieve current status information about an
4588 * association, including association state, peer receiver window size,
4589 * number of unacked data chunks, and number of data chunks pending
4590 * receipt. This information is read-only.
4592 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
4593 char __user
*optval
,
4596 struct sctp_status status
;
4597 struct sctp_association
*asoc
= NULL
;
4598 struct sctp_transport
*transport
;
4599 sctp_assoc_t associd
;
4602 if (len
< sizeof(status
)) {
4607 len
= sizeof(status
);
4608 if (copy_from_user(&status
, optval
, len
)) {
4613 associd
= status
.sstat_assoc_id
;
4614 asoc
= sctp_id2assoc(sk
, associd
);
4620 transport
= asoc
->peer
.primary_path
;
4622 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
4623 status
.sstat_state
= sctp_assoc_to_state(asoc
);
4624 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
4625 status
.sstat_unackdata
= asoc
->unack_data
;
4627 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4628 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
4629 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
4630 status
.sstat_fragmentation_point
= asoc
->frag_point
;
4631 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4632 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
4633 transport
->af_specific
->sockaddr_len
);
4634 /* Map ipv4 address into v4-mapped-on-v6 address. */
4635 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sctp_sk(sk
),
4636 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
4637 status
.sstat_primary
.spinfo_state
= transport
->state
;
4638 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
4639 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
4640 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4641 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
4643 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
4644 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
4646 if (put_user(len
, optlen
)) {
4651 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4652 __func__
, len
, status
.sstat_state
, status
.sstat_rwnd
,
4653 status
.sstat_assoc_id
);
4655 if (copy_to_user(optval
, &status
, len
)) {
4665 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4667 * Applications can retrieve information about a specific peer address
4668 * of an association, including its reachability state, congestion
4669 * window, and retransmission timer values. This information is
4672 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
4673 char __user
*optval
,
4676 struct sctp_paddrinfo pinfo
;
4677 struct sctp_transport
*transport
;
4680 if (len
< sizeof(pinfo
)) {
4685 len
= sizeof(pinfo
);
4686 if (copy_from_user(&pinfo
, optval
, len
)) {
4691 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
4692 pinfo
.spinfo_assoc_id
);
4696 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4697 pinfo
.spinfo_state
= transport
->state
;
4698 pinfo
.spinfo_cwnd
= transport
->cwnd
;
4699 pinfo
.spinfo_srtt
= transport
->srtt
;
4700 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4701 pinfo
.spinfo_mtu
= transport
->pathmtu
;
4703 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
4704 pinfo
.spinfo_state
= SCTP_ACTIVE
;
4706 if (put_user(len
, optlen
)) {
4711 if (copy_to_user(optval
, &pinfo
, len
)) {
4720 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4722 * This option is a on/off flag. If enabled no SCTP message
4723 * fragmentation will be performed. Instead if a message being sent
4724 * exceeds the current PMTU size, the message will NOT be sent and
4725 * instead a error will be indicated to the user.
4727 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
4728 char __user
*optval
, int __user
*optlen
)
4732 if (len
< sizeof(int))
4736 val
= (sctp_sk(sk
)->disable_fragments
== 1);
4737 if (put_user(len
, optlen
))
4739 if (copy_to_user(optval
, &val
, len
))
4744 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4746 * This socket option is used to specify various notifications and
4747 * ancillary data the user wishes to receive.
4749 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
4754 if (len
> sizeof(struct sctp_event_subscribe
))
4755 len
= sizeof(struct sctp_event_subscribe
);
4756 if (put_user(len
, optlen
))
4758 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
4763 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4765 * This socket option is applicable to the UDP-style socket only. When
4766 * set it will cause associations that are idle for more than the
4767 * specified number of seconds to automatically close. An association
4768 * being idle is defined an association that has NOT sent or received
4769 * user data. The special value of '0' indicates that no automatic
4770 * close of any associations should be performed. The option expects an
4771 * integer defining the number of seconds of idle time before an
4772 * association is closed.
4774 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4776 /* Applicable to UDP-style socket only */
4777 if (sctp_style(sk
, TCP
))
4779 if (len
< sizeof(int))
4782 if (put_user(len
, optlen
))
4784 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
4789 /* Helper routine to branch off an association to a new socket. */
4790 int sctp_do_peeloff(struct sock
*sk
, sctp_assoc_t id
, struct socket
**sockp
)
4792 struct sctp_association
*asoc
= sctp_id2assoc(sk
, id
);
4793 struct sctp_sock
*sp
= sctp_sk(sk
);
4794 struct socket
*sock
;
4800 /* An association cannot be branched off from an already peeled-off
4801 * socket, nor is this supported for tcp style sockets.
4803 if (!sctp_style(sk
, UDP
))
4806 /* Create a new socket. */
4807 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
4811 sctp_copy_sock(sock
->sk
, sk
, asoc
);
4813 /* Make peeled-off sockets more like 1-1 accepted sockets.
4814 * Set the daddr and initialize id to something more random
4816 sp
->pf
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
4818 /* Populate the fields of the newsk from the oldsk and migrate the
4819 * asoc to the newsk.
4821 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
4827 EXPORT_SYMBOL(sctp_do_peeloff
);
4829 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4831 sctp_peeloff_arg_t peeloff
;
4832 struct socket
*newsock
;
4833 struct file
*newfile
;
4836 if (len
< sizeof(sctp_peeloff_arg_t
))
4838 len
= sizeof(sctp_peeloff_arg_t
);
4839 if (copy_from_user(&peeloff
, optval
, len
))
4842 retval
= sctp_do_peeloff(sk
, peeloff
.associd
, &newsock
);
4846 /* Map the socket to an unused fd that can be returned to the user. */
4847 retval
= get_unused_fd_flags(0);
4849 sock_release(newsock
);
4853 newfile
= sock_alloc_file(newsock
, 0, NULL
);
4854 if (IS_ERR(newfile
)) {
4855 put_unused_fd(retval
);
4856 sock_release(newsock
);
4857 return PTR_ERR(newfile
);
4860 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__
, sk
, newsock
->sk
,
4863 /* Return the fd mapped to the new socket. */
4864 if (put_user(len
, optlen
)) {
4866 put_unused_fd(retval
);
4869 peeloff
.sd
= retval
;
4870 if (copy_to_user(optval
, &peeloff
, len
)) {
4872 put_unused_fd(retval
);
4875 fd_install(retval
, newfile
);
4880 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4882 * Applications can enable or disable heartbeats for any peer address of
4883 * an association, modify an address's heartbeat interval, force a
4884 * heartbeat to be sent immediately, and adjust the address's maximum
4885 * number of retransmissions sent before an address is considered
4886 * unreachable. The following structure is used to access and modify an
4887 * address's parameters:
4889 * struct sctp_paddrparams {
4890 * sctp_assoc_t spp_assoc_id;
4891 * struct sockaddr_storage spp_address;
4892 * uint32_t spp_hbinterval;
4893 * uint16_t spp_pathmaxrxt;
4894 * uint32_t spp_pathmtu;
4895 * uint32_t spp_sackdelay;
4896 * uint32_t spp_flags;
4899 * spp_assoc_id - (one-to-many style socket) This is filled in the
4900 * application, and identifies the association for
4902 * spp_address - This specifies which address is of interest.
4903 * spp_hbinterval - This contains the value of the heartbeat interval,
4904 * in milliseconds. If a value of zero
4905 * is present in this field then no changes are to
4906 * be made to this parameter.
4907 * spp_pathmaxrxt - This contains the maximum number of
4908 * retransmissions before this address shall be
4909 * considered unreachable. If a value of zero
4910 * is present in this field then no changes are to
4911 * be made to this parameter.
4912 * spp_pathmtu - When Path MTU discovery is disabled the value
4913 * specified here will be the "fixed" path mtu.
4914 * Note that if the spp_address field is empty
4915 * then all associations on this address will
4916 * have this fixed path mtu set upon them.
4918 * spp_sackdelay - When delayed sack is enabled, this value specifies
4919 * the number of milliseconds that sacks will be delayed
4920 * for. This value will apply to all addresses of an
4921 * association if the spp_address field is empty. Note
4922 * also, that if delayed sack is enabled and this
4923 * value is set to 0, no change is made to the last
4924 * recorded delayed sack timer value.
4926 * spp_flags - These flags are used to control various features
4927 * on an association. The flag field may contain
4928 * zero or more of the following options.
4930 * SPP_HB_ENABLE - Enable heartbeats on the
4931 * specified address. Note that if the address
4932 * field is empty all addresses for the association
4933 * have heartbeats enabled upon them.
4935 * SPP_HB_DISABLE - Disable heartbeats on the
4936 * speicifed address. Note that if the address
4937 * field is empty all addresses for the association
4938 * will have their heartbeats disabled. Note also
4939 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4940 * mutually exclusive, only one of these two should
4941 * be specified. Enabling both fields will have
4942 * undetermined results.
4944 * SPP_HB_DEMAND - Request a user initiated heartbeat
4945 * to be made immediately.
4947 * SPP_PMTUD_ENABLE - This field will enable PMTU
4948 * discovery upon the specified address. Note that
4949 * if the address feild is empty then all addresses
4950 * on the association are effected.
4952 * SPP_PMTUD_DISABLE - This field will disable PMTU
4953 * discovery upon the specified address. Note that
4954 * if the address feild is empty then all addresses
4955 * on the association are effected. Not also that
4956 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4957 * exclusive. Enabling both will have undetermined
4960 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4961 * on delayed sack. The time specified in spp_sackdelay
4962 * is used to specify the sack delay for this address. Note
4963 * that if spp_address is empty then all addresses will
4964 * enable delayed sack and take on the sack delay
4965 * value specified in spp_sackdelay.
4966 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4967 * off delayed sack. If the spp_address field is blank then
4968 * delayed sack is disabled for the entire association. Note
4969 * also that this field is mutually exclusive to
4970 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4973 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
4974 char __user
*optval
, int __user
*optlen
)
4976 struct sctp_paddrparams params
;
4977 struct sctp_transport
*trans
= NULL
;
4978 struct sctp_association
*asoc
= NULL
;
4979 struct sctp_sock
*sp
= sctp_sk(sk
);
4981 if (len
< sizeof(struct sctp_paddrparams
))
4983 len
= sizeof(struct sctp_paddrparams
);
4984 if (copy_from_user(¶ms
, optval
, len
))
4987 /* If an address other than INADDR_ANY is specified, and
4988 * no transport is found, then the request is invalid.
4990 if (!sctp_is_any(sk
, (union sctp_addr
*)¶ms
.spp_address
)) {
4991 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
4992 params
.spp_assoc_id
);
4994 pr_debug("%s: failed no transport\n", __func__
);
4999 /* Get association, if assoc_id != 0 and the socket is a one
5000 * to many style socket, and an association was not found, then
5001 * the id was invalid.
5003 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
5004 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
5005 pr_debug("%s: failed no association\n", __func__
);
5010 /* Fetch transport values. */
5011 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
5012 params
.spp_pathmtu
= trans
->pathmtu
;
5013 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
5014 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
5016 /*draft-11 doesn't say what to return in spp_flags*/
5017 params
.spp_flags
= trans
->param_flags
;
5019 /* Fetch association values. */
5020 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
5021 params
.spp_pathmtu
= asoc
->pathmtu
;
5022 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
5023 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
5025 /*draft-11 doesn't say what to return in spp_flags*/
5026 params
.spp_flags
= asoc
->param_flags
;
5028 /* Fetch socket values. */
5029 params
.spp_hbinterval
= sp
->hbinterval
;
5030 params
.spp_pathmtu
= sp
->pathmtu
;
5031 params
.spp_sackdelay
= sp
->sackdelay
;
5032 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
5034 /*draft-11 doesn't say what to return in spp_flags*/
5035 params
.spp_flags
= sp
->param_flags
;
5038 if (copy_to_user(optval
, ¶ms
, len
))
5041 if (put_user(len
, optlen
))
5048 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5050 * This option will effect the way delayed acks are performed. This
5051 * option allows you to get or set the delayed ack time, in
5052 * milliseconds. It also allows changing the delayed ack frequency.
5053 * Changing the frequency to 1 disables the delayed sack algorithm. If
5054 * the assoc_id is 0, then this sets or gets the endpoints default
5055 * values. If the assoc_id field is non-zero, then the set or get
5056 * effects the specified association for the one to many model (the
5057 * assoc_id field is ignored by the one to one model). Note that if
5058 * sack_delay or sack_freq are 0 when setting this option, then the
5059 * current values will remain unchanged.
5061 * struct sctp_sack_info {
5062 * sctp_assoc_t sack_assoc_id;
5063 * uint32_t sack_delay;
5064 * uint32_t sack_freq;
5067 * sack_assoc_id - This parameter, indicates which association the user
5068 * is performing an action upon. Note that if this field's value is
5069 * zero then the endpoints default value is changed (effecting future
5070 * associations only).
5072 * sack_delay - This parameter contains the number of milliseconds that
5073 * the user is requesting the delayed ACK timer be set to. Note that
5074 * this value is defined in the standard to be between 200 and 500
5077 * sack_freq - This parameter contains the number of packets that must
5078 * be received before a sack is sent without waiting for the delay
5079 * timer to expire. The default value for this is 2, setting this
5080 * value to 1 will disable the delayed sack algorithm.
5082 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
5083 char __user
*optval
,
5086 struct sctp_sack_info params
;
5087 struct sctp_association
*asoc
= NULL
;
5088 struct sctp_sock
*sp
= sctp_sk(sk
);
5090 if (len
>= sizeof(struct sctp_sack_info
)) {
5091 len
= sizeof(struct sctp_sack_info
);
5093 if (copy_from_user(¶ms
, optval
, len
))
5095 } else if (len
== sizeof(struct sctp_assoc_value
)) {
5096 pr_warn_ratelimited(DEPRECATED
5098 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5099 "Use struct sctp_sack_info instead\n",
5100 current
->comm
, task_pid_nr(current
));
5101 if (copy_from_user(¶ms
, optval
, len
))
5106 /* Get association, if sack_assoc_id != 0 and the socket is a one
5107 * to many style socket, and an association was not found, then
5108 * the id was invalid.
5110 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
5111 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
5115 /* Fetch association values. */
5116 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
5117 params
.sack_delay
= jiffies_to_msecs(
5119 params
.sack_freq
= asoc
->sackfreq
;
5122 params
.sack_delay
= 0;
5123 params
.sack_freq
= 1;
5126 /* Fetch socket values. */
5127 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
5128 params
.sack_delay
= sp
->sackdelay
;
5129 params
.sack_freq
= sp
->sackfreq
;
5131 params
.sack_delay
= 0;
5132 params
.sack_freq
= 1;
5136 if (copy_to_user(optval
, ¶ms
, len
))
5139 if (put_user(len
, optlen
))
5145 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5147 * Applications can specify protocol parameters for the default association
5148 * initialization. The option name argument to setsockopt() and getsockopt()
5151 * Setting initialization parameters is effective only on an unconnected
5152 * socket (for UDP-style sockets only future associations are effected
5153 * by the change). With TCP-style sockets, this option is inherited by
5154 * sockets derived from a listener socket.
5156 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
5158 if (len
< sizeof(struct sctp_initmsg
))
5160 len
= sizeof(struct sctp_initmsg
);
5161 if (put_user(len
, optlen
))
5163 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
5169 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
5170 char __user
*optval
, int __user
*optlen
)
5172 struct sctp_association
*asoc
;
5174 struct sctp_getaddrs getaddrs
;
5175 struct sctp_transport
*from
;
5177 union sctp_addr temp
;
5178 struct sctp_sock
*sp
= sctp_sk(sk
);
5183 if (len
< sizeof(struct sctp_getaddrs
))
5186 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
5189 /* For UDP-style sockets, id specifies the association to query. */
5190 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
5194 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
5195 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
5197 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
5199 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
5200 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5201 ->addr_to_user(sp
, &temp
);
5202 if (space_left
< addrlen
)
5204 if (copy_to_user(to
, &temp
, addrlen
))
5208 space_left
-= addrlen
;
5211 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
5213 bytes_copied
= ((char __user
*)to
) - optval
;
5214 if (put_user(bytes_copied
, optlen
))
5220 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
5221 size_t space_left
, int *bytes_copied
)
5223 struct sctp_sockaddr_entry
*addr
;
5224 union sctp_addr temp
;
5227 struct net
*net
= sock_net(sk
);
5230 list_for_each_entry_rcu(addr
, &net
->sctp
.local_addr_list
, list
) {
5234 if ((PF_INET
== sk
->sk_family
) &&
5235 (AF_INET6
== addr
->a
.sa
.sa_family
))
5237 if ((PF_INET6
== sk
->sk_family
) &&
5238 inet_v6_ipv6only(sk
) &&
5239 (AF_INET
== addr
->a
.sa
.sa_family
))
5241 memcpy(&temp
, &addr
->a
, sizeof(temp
));
5242 if (!temp
.v4
.sin_port
)
5243 temp
.v4
.sin_port
= htons(port
);
5245 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5246 ->addr_to_user(sctp_sk(sk
), &temp
);
5248 if (space_left
< addrlen
) {
5252 memcpy(to
, &temp
, addrlen
);
5256 space_left
-= addrlen
;
5257 *bytes_copied
+= addrlen
;
5265 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
5266 char __user
*optval
, int __user
*optlen
)
5268 struct sctp_bind_addr
*bp
;
5269 struct sctp_association
*asoc
;
5271 struct sctp_getaddrs getaddrs
;
5272 struct sctp_sockaddr_entry
*addr
;
5274 union sctp_addr temp
;
5275 struct sctp_sock
*sp
= sctp_sk(sk
);
5279 int bytes_copied
= 0;
5283 if (len
< sizeof(struct sctp_getaddrs
))
5286 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
5290 * For UDP-style sockets, id specifies the association to query.
5291 * If the id field is set to the value '0' then the locally bound
5292 * addresses are returned without regard to any particular
5295 if (0 == getaddrs
.assoc_id
) {
5296 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
5298 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
5301 bp
= &asoc
->base
.bind_addr
;
5304 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
5305 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
5307 addrs
= kmalloc(space_left
, GFP_USER
| __GFP_NOWARN
);
5311 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5312 * addresses from the global local address list.
5314 if (sctp_list_single_entry(&bp
->address_list
)) {
5315 addr
= list_entry(bp
->address_list
.next
,
5316 struct sctp_sockaddr_entry
, list
);
5317 if (sctp_is_any(sk
, &addr
->a
)) {
5318 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
5319 space_left
, &bytes_copied
);
5329 /* Protection on the bound address list is not needed since
5330 * in the socket option context we hold a socket lock and
5331 * thus the bound address list can't change.
5333 list_for_each_entry(addr
, &bp
->address_list
, list
) {
5334 memcpy(&temp
, &addr
->a
, sizeof(temp
));
5335 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5336 ->addr_to_user(sp
, &temp
);
5337 if (space_left
< addrlen
) {
5338 err
= -ENOMEM
; /*fixme: right error?*/
5341 memcpy(buf
, &temp
, addrlen
);
5343 bytes_copied
+= addrlen
;
5345 space_left
-= addrlen
;
5349 if (copy_to_user(to
, addrs
, bytes_copied
)) {
5353 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
5357 if (put_user(bytes_copied
, optlen
))
5364 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5366 * Requests that the local SCTP stack use the enclosed peer address as
5367 * the association primary. The enclosed address must be one of the
5368 * association peer's addresses.
5370 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
5371 char __user
*optval
, int __user
*optlen
)
5373 struct sctp_prim prim
;
5374 struct sctp_association
*asoc
;
5375 struct sctp_sock
*sp
= sctp_sk(sk
);
5377 if (len
< sizeof(struct sctp_prim
))
5380 len
= sizeof(struct sctp_prim
);
5382 if (copy_from_user(&prim
, optval
, len
))
5385 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
5389 if (!asoc
->peer
.primary_path
)
5392 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
5393 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
5395 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sp
,
5396 (union sctp_addr
*)&prim
.ssp_addr
);
5398 if (put_user(len
, optlen
))
5400 if (copy_to_user(optval
, &prim
, len
))
5407 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5409 * Requests that the local endpoint set the specified Adaptation Layer
5410 * Indication parameter for all future INIT and INIT-ACK exchanges.
5412 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
5413 char __user
*optval
, int __user
*optlen
)
5415 struct sctp_setadaptation adaptation
;
5417 if (len
< sizeof(struct sctp_setadaptation
))
5420 len
= sizeof(struct sctp_setadaptation
);
5422 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
5424 if (put_user(len
, optlen
))
5426 if (copy_to_user(optval
, &adaptation
, len
))
5434 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5436 * Applications that wish to use the sendto() system call may wish to
5437 * specify a default set of parameters that would normally be supplied
5438 * through the inclusion of ancillary data. This socket option allows
5439 * such an application to set the default sctp_sndrcvinfo structure.
5442 * The application that wishes to use this socket option simply passes
5443 * in to this call the sctp_sndrcvinfo structure defined in Section
5444 * 5.2.2) The input parameters accepted by this call include
5445 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5446 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5447 * to this call if the caller is using the UDP model.
5449 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5451 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
5452 int len
, char __user
*optval
,
5455 struct sctp_sock
*sp
= sctp_sk(sk
);
5456 struct sctp_association
*asoc
;
5457 struct sctp_sndrcvinfo info
;
5459 if (len
< sizeof(info
))
5464 if (copy_from_user(&info
, optval
, len
))
5467 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
5468 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
5471 info
.sinfo_stream
= asoc
->default_stream
;
5472 info
.sinfo_flags
= asoc
->default_flags
;
5473 info
.sinfo_ppid
= asoc
->default_ppid
;
5474 info
.sinfo_context
= asoc
->default_context
;
5475 info
.sinfo_timetolive
= asoc
->default_timetolive
;
5477 info
.sinfo_stream
= sp
->default_stream
;
5478 info
.sinfo_flags
= sp
->default_flags
;
5479 info
.sinfo_ppid
= sp
->default_ppid
;
5480 info
.sinfo_context
= sp
->default_context
;
5481 info
.sinfo_timetolive
= sp
->default_timetolive
;
5484 if (put_user(len
, optlen
))
5486 if (copy_to_user(optval
, &info
, len
))
5492 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5493 * (SCTP_DEFAULT_SNDINFO)
5495 static int sctp_getsockopt_default_sndinfo(struct sock
*sk
, int len
,
5496 char __user
*optval
,
5499 struct sctp_sock
*sp
= sctp_sk(sk
);
5500 struct sctp_association
*asoc
;
5501 struct sctp_sndinfo info
;
5503 if (len
< sizeof(info
))
5508 if (copy_from_user(&info
, optval
, len
))
5511 asoc
= sctp_id2assoc(sk
, info
.snd_assoc_id
);
5512 if (!asoc
&& info
.snd_assoc_id
&& sctp_style(sk
, UDP
))
5515 info
.snd_sid
= asoc
->default_stream
;
5516 info
.snd_flags
= asoc
->default_flags
;
5517 info
.snd_ppid
= asoc
->default_ppid
;
5518 info
.snd_context
= asoc
->default_context
;
5520 info
.snd_sid
= sp
->default_stream
;
5521 info
.snd_flags
= sp
->default_flags
;
5522 info
.snd_ppid
= sp
->default_ppid
;
5523 info
.snd_context
= sp
->default_context
;
5526 if (put_user(len
, optlen
))
5528 if (copy_to_user(optval
, &info
, len
))
5536 * 7.1.5 SCTP_NODELAY
5538 * Turn on/off any Nagle-like algorithm. This means that packets are
5539 * generally sent as soon as possible and no unnecessary delays are
5540 * introduced, at the cost of more packets in the network. Expects an
5541 * integer boolean flag.
5544 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
5545 char __user
*optval
, int __user
*optlen
)
5549 if (len
< sizeof(int))
5553 val
= (sctp_sk(sk
)->nodelay
== 1);
5554 if (put_user(len
, optlen
))
5556 if (copy_to_user(optval
, &val
, len
))
5563 * 7.1.1 SCTP_RTOINFO
5565 * The protocol parameters used to initialize and bound retransmission
5566 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5567 * and modify these parameters.
5568 * All parameters are time values, in milliseconds. A value of 0, when
5569 * modifying the parameters, indicates that the current value should not
5573 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
5574 char __user
*optval
,
5575 int __user
*optlen
) {
5576 struct sctp_rtoinfo rtoinfo
;
5577 struct sctp_association
*asoc
;
5579 if (len
< sizeof (struct sctp_rtoinfo
))
5582 len
= sizeof(struct sctp_rtoinfo
);
5584 if (copy_from_user(&rtoinfo
, optval
, len
))
5587 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
5589 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
5592 /* Values corresponding to the specific association. */
5594 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
5595 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
5596 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
5598 /* Values corresponding to the endpoint. */
5599 struct sctp_sock
*sp
= sctp_sk(sk
);
5601 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
5602 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
5603 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
5606 if (put_user(len
, optlen
))
5609 if (copy_to_user(optval
, &rtoinfo
, len
))
5617 * 7.1.2 SCTP_ASSOCINFO
5619 * This option is used to tune the maximum retransmission attempts
5620 * of the association.
5621 * Returns an error if the new association retransmission value is
5622 * greater than the sum of the retransmission value of the peer.
5623 * See [SCTP] for more information.
5626 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
5627 char __user
*optval
,
5631 struct sctp_assocparams assocparams
;
5632 struct sctp_association
*asoc
;
5633 struct list_head
*pos
;
5636 if (len
< sizeof (struct sctp_assocparams
))
5639 len
= sizeof(struct sctp_assocparams
);
5641 if (copy_from_user(&assocparams
, optval
, len
))
5644 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
5646 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
5649 /* Values correspoinding to the specific association */
5651 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
5652 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
5653 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
5654 assocparams
.sasoc_cookie_life
= ktime_to_ms(asoc
->cookie_life
);
5656 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
5660 assocparams
.sasoc_number_peer_destinations
= cnt
;
5662 /* Values corresponding to the endpoint */
5663 struct sctp_sock
*sp
= sctp_sk(sk
);
5665 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
5666 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
5667 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
5668 assocparams
.sasoc_cookie_life
=
5669 sp
->assocparams
.sasoc_cookie_life
;
5670 assocparams
.sasoc_number_peer_destinations
=
5672 sasoc_number_peer_destinations
;
5675 if (put_user(len
, optlen
))
5678 if (copy_to_user(optval
, &assocparams
, len
))
5685 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5687 * This socket option is a boolean flag which turns on or off mapped V4
5688 * addresses. If this option is turned on and the socket is type
5689 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5690 * If this option is turned off, then no mapping will be done of V4
5691 * addresses and a user will receive both PF_INET6 and PF_INET type
5692 * addresses on the socket.
5694 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
5695 char __user
*optval
, int __user
*optlen
)
5698 struct sctp_sock
*sp
= sctp_sk(sk
);
5700 if (len
< sizeof(int))
5705 if (put_user(len
, optlen
))
5707 if (copy_to_user(optval
, &val
, len
))
5714 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5715 * (chapter and verse is quoted at sctp_setsockopt_context())
5717 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
5718 char __user
*optval
, int __user
*optlen
)
5720 struct sctp_assoc_value params
;
5721 struct sctp_sock
*sp
;
5722 struct sctp_association
*asoc
;
5724 if (len
< sizeof(struct sctp_assoc_value
))
5727 len
= sizeof(struct sctp_assoc_value
);
5729 if (copy_from_user(¶ms
, optval
, len
))
5734 if (params
.assoc_id
!= 0) {
5735 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5738 params
.assoc_value
= asoc
->default_rcv_context
;
5740 params
.assoc_value
= sp
->default_rcv_context
;
5743 if (put_user(len
, optlen
))
5745 if (copy_to_user(optval
, ¶ms
, len
))
5752 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5753 * This option will get or set the maximum size to put in any outgoing
5754 * SCTP DATA chunk. If a message is larger than this size it will be
5755 * fragmented by SCTP into the specified size. Note that the underlying
5756 * SCTP implementation may fragment into smaller sized chunks when the
5757 * PMTU of the underlying association is smaller than the value set by
5758 * the user. The default value for this option is '0' which indicates
5759 * the user is NOT limiting fragmentation and only the PMTU will effect
5760 * SCTP's choice of DATA chunk size. Note also that values set larger
5761 * than the maximum size of an IP datagram will effectively let SCTP
5762 * control fragmentation (i.e. the same as setting this option to 0).
5764 * The following structure is used to access and modify this parameter:
5766 * struct sctp_assoc_value {
5767 * sctp_assoc_t assoc_id;
5768 * uint32_t assoc_value;
5771 * assoc_id: This parameter is ignored for one-to-one style sockets.
5772 * For one-to-many style sockets this parameter indicates which
5773 * association the user is performing an action upon. Note that if
5774 * this field's value is zero then the endpoints default value is
5775 * changed (effecting future associations only).
5776 * assoc_value: This parameter specifies the maximum size in bytes.
5778 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
5779 char __user
*optval
, int __user
*optlen
)
5781 struct sctp_assoc_value params
;
5782 struct sctp_association
*asoc
;
5784 if (len
== sizeof(int)) {
5785 pr_warn_ratelimited(DEPRECATED
5787 "Use of int in maxseg socket option.\n"
5788 "Use struct sctp_assoc_value instead\n",
5789 current
->comm
, task_pid_nr(current
));
5790 params
.assoc_id
= 0;
5791 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5792 len
= sizeof(struct sctp_assoc_value
);
5793 if (copy_from_user(¶ms
, optval
, sizeof(params
)))
5798 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5799 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
5803 params
.assoc_value
= asoc
->frag_point
;
5805 params
.assoc_value
= sctp_sk(sk
)->user_frag
;
5807 if (put_user(len
, optlen
))
5809 if (len
== sizeof(int)) {
5810 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5813 if (copy_to_user(optval
, ¶ms
, len
))
5821 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5822 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5824 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
5825 char __user
*optval
, int __user
*optlen
)
5829 if (len
< sizeof(int))
5834 val
= sctp_sk(sk
)->frag_interleave
;
5835 if (put_user(len
, optlen
))
5837 if (copy_to_user(optval
, &val
, len
))
5844 * 7.1.25. Set or Get the sctp partial delivery point
5845 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5847 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
5848 char __user
*optval
,
5853 if (len
< sizeof(u32
))
5858 val
= sctp_sk(sk
)->pd_point
;
5859 if (put_user(len
, optlen
))
5861 if (copy_to_user(optval
, &val
, len
))
5868 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5869 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5871 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5872 char __user
*optval
,
5875 struct sctp_assoc_value params
;
5876 struct sctp_sock
*sp
;
5877 struct sctp_association
*asoc
;
5879 if (len
== sizeof(int)) {
5880 pr_warn_ratelimited(DEPRECATED
5882 "Use of int in max_burst socket option.\n"
5883 "Use struct sctp_assoc_value instead\n",
5884 current
->comm
, task_pid_nr(current
));
5885 params
.assoc_id
= 0;
5886 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5887 len
= sizeof(struct sctp_assoc_value
);
5888 if (copy_from_user(¶ms
, optval
, len
))
5895 if (params
.assoc_id
!= 0) {
5896 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5899 params
.assoc_value
= asoc
->max_burst
;
5901 params
.assoc_value
= sp
->max_burst
;
5903 if (len
== sizeof(int)) {
5904 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5907 if (copy_to_user(optval
, ¶ms
, len
))
5915 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5916 char __user
*optval
, int __user
*optlen
)
5918 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
5919 struct sctp_hmacalgo __user
*p
= (void __user
*)optval
;
5920 struct sctp_hmac_algo_param
*hmacs
;
5925 if (!ep
->auth_enable
)
5928 hmacs
= ep
->auth_hmacs_list
;
5929 data_len
= ntohs(hmacs
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5931 if (len
< sizeof(struct sctp_hmacalgo
) + data_len
)
5934 len
= sizeof(struct sctp_hmacalgo
) + data_len
;
5935 num_idents
= data_len
/ sizeof(u16
);
5937 if (put_user(len
, optlen
))
5939 if (put_user(num_idents
, &p
->shmac_num_idents
))
5941 for (i
= 0; i
< num_idents
; i
++) {
5942 __u16 hmacid
= ntohs(hmacs
->hmac_ids
[i
]);
5944 if (copy_to_user(&p
->shmac_idents
[i
], &hmacid
, sizeof(__u16
)))
5950 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5951 char __user
*optval
, int __user
*optlen
)
5953 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
5954 struct sctp_authkeyid val
;
5955 struct sctp_association
*asoc
;
5957 if (!ep
->auth_enable
)
5960 if (len
< sizeof(struct sctp_authkeyid
))
5962 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5965 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5966 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5970 val
.scact_keynumber
= asoc
->active_key_id
;
5972 val
.scact_keynumber
= ep
->active_key_id
;
5974 len
= sizeof(struct sctp_authkeyid
);
5975 if (put_user(len
, optlen
))
5977 if (copy_to_user(optval
, &val
, len
))
5983 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5984 char __user
*optval
, int __user
*optlen
)
5986 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
5987 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5988 struct sctp_authchunks val
;
5989 struct sctp_association
*asoc
;
5990 struct sctp_chunks_param
*ch
;
5994 if (!ep
->auth_enable
)
5997 if (len
< sizeof(struct sctp_authchunks
))
6000 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
6003 to
= p
->gauth_chunks
;
6004 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
6008 ch
= asoc
->peer
.peer_chunks
;
6012 /* See if the user provided enough room for all the data */
6013 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
6014 if (len
< num_chunks
)
6017 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
6020 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
6021 if (put_user(len
, optlen
))
6023 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
6028 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
6029 char __user
*optval
, int __user
*optlen
)
6031 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6032 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
6033 struct sctp_authchunks val
;
6034 struct sctp_association
*asoc
;
6035 struct sctp_chunks_param
*ch
;
6039 if (!ep
->auth_enable
)
6042 if (len
< sizeof(struct sctp_authchunks
))
6045 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
6048 to
= p
->gauth_chunks
;
6049 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
6050 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
6054 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
6056 ch
= ep
->auth_chunk_list
;
6061 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
6062 if (len
< sizeof(struct sctp_authchunks
) + num_chunks
)
6065 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
6068 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
6069 if (put_user(len
, optlen
))
6071 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
6078 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6079 * This option gets the current number of associations that are attached
6080 * to a one-to-many style socket. The option value is an uint32_t.
6082 static int sctp_getsockopt_assoc_number(struct sock
*sk
, int len
,
6083 char __user
*optval
, int __user
*optlen
)
6085 struct sctp_sock
*sp
= sctp_sk(sk
);
6086 struct sctp_association
*asoc
;
6089 if (sctp_style(sk
, TCP
))
6092 if (len
< sizeof(u32
))
6097 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6101 if (put_user(len
, optlen
))
6103 if (copy_to_user(optval
, &val
, len
))
6110 * 8.1.23 SCTP_AUTO_ASCONF
6111 * See the corresponding setsockopt entry as description
6113 static int sctp_getsockopt_auto_asconf(struct sock
*sk
, int len
,
6114 char __user
*optval
, int __user
*optlen
)
6118 if (len
< sizeof(int))
6122 if (sctp_sk(sk
)->do_auto_asconf
&& sctp_is_ep_boundall(sk
))
6124 if (put_user(len
, optlen
))
6126 if (copy_to_user(optval
, &val
, len
))
6132 * 8.2.6. Get the Current Identifiers of Associations
6133 * (SCTP_GET_ASSOC_ID_LIST)
6135 * This option gets the current list of SCTP association identifiers of
6136 * the SCTP associations handled by a one-to-many style socket.
6138 static int sctp_getsockopt_assoc_ids(struct sock
*sk
, int len
,
6139 char __user
*optval
, int __user
*optlen
)
6141 struct sctp_sock
*sp
= sctp_sk(sk
);
6142 struct sctp_association
*asoc
;
6143 struct sctp_assoc_ids
*ids
;
6146 if (sctp_style(sk
, TCP
))
6149 if (len
< sizeof(struct sctp_assoc_ids
))
6152 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6156 if (len
< sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
)
6159 len
= sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
;
6161 ids
= kmalloc(len
, GFP_USER
| __GFP_NOWARN
);
6165 ids
->gaids_number_of_ids
= num
;
6167 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6168 ids
->gaids_assoc_id
[num
++] = asoc
->assoc_id
;
6171 if (put_user(len
, optlen
) || copy_to_user(optval
, ids
, len
)) {
6181 * SCTP_PEER_ADDR_THLDS
6183 * This option allows us to fetch the partially failed threshold for one or all
6184 * transports in an association. See Section 6.1 of:
6185 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6187 static int sctp_getsockopt_paddr_thresholds(struct sock
*sk
,
6188 char __user
*optval
,
6192 struct sctp_paddrthlds val
;
6193 struct sctp_transport
*trans
;
6194 struct sctp_association
*asoc
;
6196 if (len
< sizeof(struct sctp_paddrthlds
))
6198 len
= sizeof(struct sctp_paddrthlds
);
6199 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
, len
))
6202 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
6203 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
6207 val
.spt_pathpfthld
= asoc
->pf_retrans
;
6208 val
.spt_pathmaxrxt
= asoc
->pathmaxrxt
;
6210 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
6215 val
.spt_pathmaxrxt
= trans
->pathmaxrxt
;
6216 val
.spt_pathpfthld
= trans
->pf_retrans
;
6219 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
6226 * SCTP_GET_ASSOC_STATS
6228 * This option retrieves local per endpoint statistics. It is modeled
6229 * after OpenSolaris' implementation
6231 static int sctp_getsockopt_assoc_stats(struct sock
*sk
, int len
,
6232 char __user
*optval
,
6235 struct sctp_assoc_stats sas
;
6236 struct sctp_association
*asoc
= NULL
;
6238 /* User must provide at least the assoc id */
6239 if (len
< sizeof(sctp_assoc_t
))
6242 /* Allow the struct to grow and fill in as much as possible */
6243 len
= min_t(size_t, len
, sizeof(sas
));
6245 if (copy_from_user(&sas
, optval
, len
))
6248 asoc
= sctp_id2assoc(sk
, sas
.sas_assoc_id
);
6252 sas
.sas_rtxchunks
= asoc
->stats
.rtxchunks
;
6253 sas
.sas_gapcnt
= asoc
->stats
.gapcnt
;
6254 sas
.sas_outofseqtsns
= asoc
->stats
.outofseqtsns
;
6255 sas
.sas_osacks
= asoc
->stats
.osacks
;
6256 sas
.sas_isacks
= asoc
->stats
.isacks
;
6257 sas
.sas_octrlchunks
= asoc
->stats
.octrlchunks
;
6258 sas
.sas_ictrlchunks
= asoc
->stats
.ictrlchunks
;
6259 sas
.sas_oodchunks
= asoc
->stats
.oodchunks
;
6260 sas
.sas_iodchunks
= asoc
->stats
.iodchunks
;
6261 sas
.sas_ouodchunks
= asoc
->stats
.ouodchunks
;
6262 sas
.sas_iuodchunks
= asoc
->stats
.iuodchunks
;
6263 sas
.sas_idupchunks
= asoc
->stats
.idupchunks
;
6264 sas
.sas_opackets
= asoc
->stats
.opackets
;
6265 sas
.sas_ipackets
= asoc
->stats
.ipackets
;
6267 /* New high max rto observed, will return 0 if not a single
6268 * RTO update took place. obs_rto_ipaddr will be bogus
6271 sas
.sas_maxrto
= asoc
->stats
.max_obs_rto
;
6272 memcpy(&sas
.sas_obs_rto_ipaddr
, &asoc
->stats
.obs_rto_ipaddr
,
6273 sizeof(struct sockaddr_storage
));
6275 /* Mark beginning of a new observation period */
6276 asoc
->stats
.max_obs_rto
= asoc
->rto_min
;
6278 if (put_user(len
, optlen
))
6281 pr_debug("%s: len:%d, assoc_id:%d\n", __func__
, len
, sas
.sas_assoc_id
);
6283 if (copy_to_user(optval
, &sas
, len
))
6289 static int sctp_getsockopt_recvrcvinfo(struct sock
*sk
, int len
,
6290 char __user
*optval
,
6295 if (len
< sizeof(int))
6299 if (sctp_sk(sk
)->recvrcvinfo
)
6301 if (put_user(len
, optlen
))
6303 if (copy_to_user(optval
, &val
, len
))
6309 static int sctp_getsockopt_recvnxtinfo(struct sock
*sk
, int len
,
6310 char __user
*optval
,
6315 if (len
< sizeof(int))
6319 if (sctp_sk(sk
)->recvnxtinfo
)
6321 if (put_user(len
, optlen
))
6323 if (copy_to_user(optval
, &val
, len
))
6329 static int sctp_getsockopt_pr_supported(struct sock
*sk
, int len
,
6330 char __user
*optval
,
6333 struct sctp_assoc_value params
;
6334 struct sctp_association
*asoc
;
6335 int retval
= -EFAULT
;
6337 if (len
< sizeof(params
)) {
6342 len
= sizeof(params
);
6343 if (copy_from_user(¶ms
, optval
, len
))
6346 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6348 params
.assoc_value
= asoc
->prsctp_enable
;
6349 } else if (!params
.assoc_id
) {
6350 struct sctp_sock
*sp
= sctp_sk(sk
);
6352 params
.assoc_value
= sp
->ep
->prsctp_enable
;
6358 if (put_user(len
, optlen
))
6361 if (copy_to_user(optval
, ¶ms
, len
))
6370 static int sctp_getsockopt_default_prinfo(struct sock
*sk
, int len
,
6371 char __user
*optval
,
6374 struct sctp_default_prinfo info
;
6375 struct sctp_association
*asoc
;
6376 int retval
= -EFAULT
;
6378 if (len
< sizeof(info
)) {
6384 if (copy_from_user(&info
, optval
, len
))
6387 asoc
= sctp_id2assoc(sk
, info
.pr_assoc_id
);
6389 info
.pr_policy
= SCTP_PR_POLICY(asoc
->default_flags
);
6390 info
.pr_value
= asoc
->default_timetolive
;
6391 } else if (!info
.pr_assoc_id
) {
6392 struct sctp_sock
*sp
= sctp_sk(sk
);
6394 info
.pr_policy
= SCTP_PR_POLICY(sp
->default_flags
);
6395 info
.pr_value
= sp
->default_timetolive
;
6401 if (put_user(len
, optlen
))
6404 if (copy_to_user(optval
, &info
, len
))
6413 static int sctp_getsockopt_pr_assocstatus(struct sock
*sk
, int len
,
6414 char __user
*optval
,
6417 struct sctp_prstatus params
;
6418 struct sctp_association
*asoc
;
6420 int retval
= -EINVAL
;
6422 if (len
< sizeof(params
))
6425 len
= sizeof(params
);
6426 if (copy_from_user(¶ms
, optval
, len
)) {
6431 policy
= params
.sprstat_policy
;
6432 if (policy
& ~SCTP_PR_SCTP_MASK
)
6435 asoc
= sctp_id2assoc(sk
, params
.sprstat_assoc_id
);
6439 if (policy
== SCTP_PR_SCTP_NONE
) {
6440 params
.sprstat_abandoned_unsent
= 0;
6441 params
.sprstat_abandoned_sent
= 0;
6442 for (policy
= 0; policy
<= SCTP_PR_INDEX(MAX
); policy
++) {
6443 params
.sprstat_abandoned_unsent
+=
6444 asoc
->abandoned_unsent
[policy
];
6445 params
.sprstat_abandoned_sent
+=
6446 asoc
->abandoned_sent
[policy
];
6449 params
.sprstat_abandoned_unsent
=
6450 asoc
->abandoned_unsent
[__SCTP_PR_INDEX(policy
)];
6451 params
.sprstat_abandoned_sent
=
6452 asoc
->abandoned_sent
[__SCTP_PR_INDEX(policy
)];
6455 if (put_user(len
, optlen
)) {
6460 if (copy_to_user(optval
, ¶ms
, len
)) {
6471 static int sctp_getsockopt_enable_strreset(struct sock
*sk
, int len
,
6472 char __user
*optval
,
6475 struct sctp_assoc_value params
;
6476 struct sctp_association
*asoc
;
6477 int retval
= -EFAULT
;
6479 if (len
< sizeof(params
)) {
6484 len
= sizeof(params
);
6485 if (copy_from_user(¶ms
, optval
, len
))
6488 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6490 params
.assoc_value
= asoc
->strreset_enable
;
6491 } else if (!params
.assoc_id
) {
6492 struct sctp_sock
*sp
= sctp_sk(sk
);
6494 params
.assoc_value
= sp
->ep
->strreset_enable
;
6500 if (put_user(len
, optlen
))
6503 if (copy_to_user(optval
, ¶ms
, len
))
6512 static int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
6513 char __user
*optval
, int __user
*optlen
)
6518 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
6520 /* I can hardly begin to describe how wrong this is. This is
6521 * so broken as to be worse than useless. The API draft
6522 * REALLY is NOT helpful here... I am not convinced that the
6523 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
6524 * are at all well-founded.
6526 if (level
!= SOL_SCTP
) {
6527 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
6529 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
6533 if (get_user(len
, optlen
))
6543 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
6545 case SCTP_DISABLE_FRAGMENTS
:
6546 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
6550 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
6552 case SCTP_AUTOCLOSE
:
6553 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
6555 case SCTP_SOCKOPT_PEELOFF
:
6556 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
6558 case SCTP_PEER_ADDR_PARAMS
:
6559 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
6562 case SCTP_DELAYED_SACK
:
6563 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
6567 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
6569 case SCTP_GET_PEER_ADDRS
:
6570 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
6573 case SCTP_GET_LOCAL_ADDRS
:
6574 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
6577 case SCTP_SOCKOPT_CONNECTX3
:
6578 retval
= sctp_getsockopt_connectx3(sk
, len
, optval
, optlen
);
6580 case SCTP_DEFAULT_SEND_PARAM
:
6581 retval
= sctp_getsockopt_default_send_param(sk
, len
,
6584 case SCTP_DEFAULT_SNDINFO
:
6585 retval
= sctp_getsockopt_default_sndinfo(sk
, len
,
6588 case SCTP_PRIMARY_ADDR
:
6589 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
6592 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
6595 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
6597 case SCTP_ASSOCINFO
:
6598 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
6600 case SCTP_I_WANT_MAPPED_V4_ADDR
:
6601 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
6604 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
6606 case SCTP_GET_PEER_ADDR_INFO
:
6607 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
6610 case SCTP_ADAPTATION_LAYER
:
6611 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
6615 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
6617 case SCTP_FRAGMENT_INTERLEAVE
:
6618 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
6621 case SCTP_PARTIAL_DELIVERY_POINT
:
6622 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
6625 case SCTP_MAX_BURST
:
6626 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
6629 case SCTP_AUTH_CHUNK
:
6630 case SCTP_AUTH_DELETE_KEY
:
6631 retval
= -EOPNOTSUPP
;
6633 case SCTP_HMAC_IDENT
:
6634 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
6636 case SCTP_AUTH_ACTIVE_KEY
:
6637 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
6639 case SCTP_PEER_AUTH_CHUNKS
:
6640 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
6643 case SCTP_LOCAL_AUTH_CHUNKS
:
6644 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
6647 case SCTP_GET_ASSOC_NUMBER
:
6648 retval
= sctp_getsockopt_assoc_number(sk
, len
, optval
, optlen
);
6650 case SCTP_GET_ASSOC_ID_LIST
:
6651 retval
= sctp_getsockopt_assoc_ids(sk
, len
, optval
, optlen
);
6653 case SCTP_AUTO_ASCONF
:
6654 retval
= sctp_getsockopt_auto_asconf(sk
, len
, optval
, optlen
);
6656 case SCTP_PEER_ADDR_THLDS
:
6657 retval
= sctp_getsockopt_paddr_thresholds(sk
, optval
, len
, optlen
);
6659 case SCTP_GET_ASSOC_STATS
:
6660 retval
= sctp_getsockopt_assoc_stats(sk
, len
, optval
, optlen
);
6662 case SCTP_RECVRCVINFO
:
6663 retval
= sctp_getsockopt_recvrcvinfo(sk
, len
, optval
, optlen
);
6665 case SCTP_RECVNXTINFO
:
6666 retval
= sctp_getsockopt_recvnxtinfo(sk
, len
, optval
, optlen
);
6668 case SCTP_PR_SUPPORTED
:
6669 retval
= sctp_getsockopt_pr_supported(sk
, len
, optval
, optlen
);
6671 case SCTP_DEFAULT_PRINFO
:
6672 retval
= sctp_getsockopt_default_prinfo(sk
, len
, optval
,
6675 case SCTP_PR_ASSOC_STATUS
:
6676 retval
= sctp_getsockopt_pr_assocstatus(sk
, len
, optval
,
6679 case SCTP_ENABLE_STREAM_RESET
:
6680 retval
= sctp_getsockopt_enable_strreset(sk
, len
, optval
,
6684 retval
= -ENOPROTOOPT
;
6692 static int sctp_hash(struct sock
*sk
)
6698 static void sctp_unhash(struct sock
*sk
)
6703 /* Check if port is acceptable. Possibly find first available port.
6705 * The port hash table (contained in the 'global' SCTP protocol storage
6706 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6707 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6708 * list (the list number is the port number hashed out, so as you
6709 * would expect from a hash function, all the ports in a given list have
6710 * such a number that hashes out to the same list number; you were
6711 * expecting that, right?); so each list has a set of ports, with a
6712 * link to the socket (struct sock) that uses it, the port number and
6713 * a fastreuse flag (FIXME: NPI ipg).
6715 static struct sctp_bind_bucket
*sctp_bucket_create(
6716 struct sctp_bind_hashbucket
*head
, struct net
*, unsigned short snum
);
6718 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
6720 struct sctp_bind_hashbucket
*head
; /* hash list */
6721 struct sctp_bind_bucket
*pp
;
6722 unsigned short snum
;
6725 snum
= ntohs(addr
->v4
.sin_port
);
6727 pr_debug("%s: begins, snum:%d\n", __func__
, snum
);
6732 /* Search for an available port. */
6733 int low
, high
, remaining
, index
;
6735 struct net
*net
= sock_net(sk
);
6737 inet_get_local_port_range(net
, &low
, &high
);
6738 remaining
= (high
- low
) + 1;
6739 rover
= prandom_u32() % remaining
+ low
;
6743 if ((rover
< low
) || (rover
> high
))
6745 if (inet_is_local_reserved_port(net
, rover
))
6747 index
= sctp_phashfn(sock_net(sk
), rover
);
6748 head
= &sctp_port_hashtable
[index
];
6749 spin_lock(&head
->lock
);
6750 sctp_for_each_hentry(pp
, &head
->chain
)
6751 if ((pp
->port
== rover
) &&
6752 net_eq(sock_net(sk
), pp
->net
))
6756 spin_unlock(&head
->lock
);
6757 } while (--remaining
> 0);
6759 /* Exhausted local port range during search? */
6764 /* OK, here is the one we will use. HEAD (the port
6765 * hash table list entry) is non-NULL and we hold it's
6770 /* We are given an specific port number; we verify
6771 * that it is not being used. If it is used, we will
6772 * exahust the search in the hash list corresponding
6773 * to the port number (snum) - we detect that with the
6774 * port iterator, pp being NULL.
6776 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
), snum
)];
6777 spin_lock(&head
->lock
);
6778 sctp_for_each_hentry(pp
, &head
->chain
) {
6779 if ((pp
->port
== snum
) && net_eq(pp
->net
, sock_net(sk
)))
6786 if (!hlist_empty(&pp
->owner
)) {
6787 /* We had a port hash table hit - there is an
6788 * available port (pp != NULL) and it is being
6789 * used by other socket (pp->owner not empty); that other
6790 * socket is going to be sk2.
6792 int reuse
= sk
->sk_reuse
;
6795 pr_debug("%s: found a possible match\n", __func__
);
6797 if (pp
->fastreuse
&& sk
->sk_reuse
&&
6798 sk
->sk_state
!= SCTP_SS_LISTENING
)
6801 /* Run through the list of sockets bound to the port
6802 * (pp->port) [via the pointers bind_next and
6803 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
6804 * we get the endpoint they describe and run through
6805 * the endpoint's list of IP (v4 or v6) addresses,
6806 * comparing each of the addresses with the address of
6807 * the socket sk. If we find a match, then that means
6808 * that this port/socket (sk) combination are already
6811 sk_for_each_bound(sk2
, &pp
->owner
) {
6812 struct sctp_endpoint
*ep2
;
6813 ep2
= sctp_sk(sk2
)->ep
;
6816 (reuse
&& sk2
->sk_reuse
&&
6817 sk2
->sk_state
!= SCTP_SS_LISTENING
))
6820 if (sctp_bind_addr_conflict(&ep2
->base
.bind_addr
, addr
,
6821 sctp_sk(sk2
), sctp_sk(sk
))) {
6827 pr_debug("%s: found a match\n", __func__
);
6830 /* If there was a hash table miss, create a new port. */
6832 if (!pp
&& !(pp
= sctp_bucket_create(head
, sock_net(sk
), snum
)))
6835 /* In either case (hit or miss), make sure fastreuse is 1 only
6836 * if sk->sk_reuse is too (that is, if the caller requested
6837 * SO_REUSEADDR on this socket -sk-).
6839 if (hlist_empty(&pp
->owner
)) {
6840 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
6844 } else if (pp
->fastreuse
&&
6845 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
6848 /* We are set, so fill up all the data in the hash table
6849 * entry, tie the socket list information with the rest of the
6850 * sockets FIXME: Blurry, NPI (ipg).
6853 if (!sctp_sk(sk
)->bind_hash
) {
6854 inet_sk(sk
)->inet_num
= snum
;
6855 sk_add_bind_node(sk
, &pp
->owner
);
6856 sctp_sk(sk
)->bind_hash
= pp
;
6861 spin_unlock(&head
->lock
);
6868 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6869 * port is requested.
6871 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
6873 union sctp_addr addr
;
6874 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
6876 /* Set up a dummy address struct from the sk. */
6877 af
->from_sk(&addr
, sk
);
6878 addr
.v4
.sin_port
= htons(snum
);
6880 /* Note: sk->sk_num gets filled in if ephemeral port request. */
6881 return !!sctp_get_port_local(sk
, &addr
);
6885 * Move a socket to LISTENING state.
6887 static int sctp_listen_start(struct sock
*sk
, int backlog
)
6889 struct sctp_sock
*sp
= sctp_sk(sk
);
6890 struct sctp_endpoint
*ep
= sp
->ep
;
6891 struct crypto_shash
*tfm
= NULL
;
6894 /* Allocate HMAC for generating cookie. */
6895 if (!sp
->hmac
&& sp
->sctp_hmac_alg
) {
6896 sprintf(alg
, "hmac(%s)", sp
->sctp_hmac_alg
);
6897 tfm
= crypto_alloc_shash(alg
, 0, 0);
6899 net_info_ratelimited("failed to load transform for %s: %ld\n",
6900 sp
->sctp_hmac_alg
, PTR_ERR(tfm
));
6903 sctp_sk(sk
)->hmac
= tfm
;
6907 * If a bind() or sctp_bindx() is not called prior to a listen()
6908 * call that allows new associations to be accepted, the system
6909 * picks an ephemeral port and will choose an address set equivalent
6910 * to binding with a wildcard address.
6912 * This is not currently spelled out in the SCTP sockets
6913 * extensions draft, but follows the practice as seen in TCP
6917 sk
->sk_state
= SCTP_SS_LISTENING
;
6918 if (!ep
->base
.bind_addr
.port
) {
6919 if (sctp_autobind(sk
))
6922 if (sctp_get_port(sk
, inet_sk(sk
)->inet_num
)) {
6923 sk
->sk_state
= SCTP_SS_CLOSED
;
6928 sk
->sk_max_ack_backlog
= backlog
;
6929 sctp_hash_endpoint(ep
);
6934 * 4.1.3 / 5.1.3 listen()
6936 * By default, new associations are not accepted for UDP style sockets.
6937 * An application uses listen() to mark a socket as being able to
6938 * accept new associations.
6940 * On TCP style sockets, applications use listen() to ready the SCTP
6941 * endpoint for accepting inbound associations.
6943 * On both types of endpoints a backlog of '0' disables listening.
6945 * Move a socket to LISTENING state.
6947 int sctp_inet_listen(struct socket
*sock
, int backlog
)
6949 struct sock
*sk
= sock
->sk
;
6950 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6953 if (unlikely(backlog
< 0))
6958 /* Peeled-off sockets are not allowed to listen(). */
6959 if (sctp_style(sk
, UDP_HIGH_BANDWIDTH
))
6962 if (sock
->state
!= SS_UNCONNECTED
)
6965 /* If backlog is zero, disable listening. */
6967 if (sctp_sstate(sk
, CLOSED
))
6971 sctp_unhash_endpoint(ep
);
6972 sk
->sk_state
= SCTP_SS_CLOSED
;
6974 sctp_sk(sk
)->bind_hash
->fastreuse
= 1;
6978 /* If we are already listening, just update the backlog */
6979 if (sctp_sstate(sk
, LISTENING
))
6980 sk
->sk_max_ack_backlog
= backlog
;
6982 err
= sctp_listen_start(sk
, backlog
);
6994 * This function is done by modeling the current datagram_poll() and the
6995 * tcp_poll(). Note that, based on these implementations, we don't
6996 * lock the socket in this function, even though it seems that,
6997 * ideally, locking or some other mechanisms can be used to ensure
6998 * the integrity of the counters (sndbuf and wmem_alloc) used
6999 * in this place. We assume that we don't need locks either until proven
7002 * Another thing to note is that we include the Async I/O support
7003 * here, again, by modeling the current TCP/UDP code. We don't have
7004 * a good way to test with it yet.
7006 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
7008 struct sock
*sk
= sock
->sk
;
7009 struct sctp_sock
*sp
= sctp_sk(sk
);
7012 poll_wait(file
, sk_sleep(sk
), wait
);
7014 sock_rps_record_flow(sk
);
7016 /* A TCP-style listening socket becomes readable when the accept queue
7019 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
7020 return (!list_empty(&sp
->ep
->asocs
)) ?
7021 (POLLIN
| POLLRDNORM
) : 0;
7025 /* Is there any exceptional events? */
7026 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
7028 (sock_flag(sk
, SOCK_SELECT_ERR_QUEUE
) ? POLLPRI
: 0);
7029 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7030 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
7031 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
7034 /* Is it readable? Reconsider this code with TCP-style support. */
7035 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7036 mask
|= POLLIN
| POLLRDNORM
;
7038 /* The association is either gone or not ready. */
7039 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
7042 /* Is it writable? */
7043 if (sctp_writeable(sk
)) {
7044 mask
|= POLLOUT
| POLLWRNORM
;
7046 sk_set_bit(SOCKWQ_ASYNC_NOSPACE
, sk
);
7048 * Since the socket is not locked, the buffer
7049 * might be made available after the writeable check and
7050 * before the bit is set. This could cause a lost I/O
7051 * signal. tcp_poll() has a race breaker for this race
7052 * condition. Based on their implementation, we put
7053 * in the following code to cover it as well.
7055 if (sctp_writeable(sk
))
7056 mask
|= POLLOUT
| POLLWRNORM
;
7061 /********************************************************************
7062 * 2nd Level Abstractions
7063 ********************************************************************/
7065 static struct sctp_bind_bucket
*sctp_bucket_create(
7066 struct sctp_bind_hashbucket
*head
, struct net
*net
, unsigned short snum
)
7068 struct sctp_bind_bucket
*pp
;
7070 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
7072 SCTP_DBG_OBJCNT_INC(bind_bucket
);
7075 INIT_HLIST_HEAD(&pp
->owner
);
7077 hlist_add_head(&pp
->node
, &head
->chain
);
7082 /* Caller must hold hashbucket lock for this tb with local BH disabled */
7083 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
7085 if (pp
&& hlist_empty(&pp
->owner
)) {
7086 __hlist_del(&pp
->node
);
7087 kmem_cache_free(sctp_bucket_cachep
, pp
);
7088 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
7092 /* Release this socket's reference to a local port. */
7093 static inline void __sctp_put_port(struct sock
*sk
)
7095 struct sctp_bind_hashbucket
*head
=
7096 &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
),
7097 inet_sk(sk
)->inet_num
)];
7098 struct sctp_bind_bucket
*pp
;
7100 spin_lock(&head
->lock
);
7101 pp
= sctp_sk(sk
)->bind_hash
;
7102 __sk_del_bind_node(sk
);
7103 sctp_sk(sk
)->bind_hash
= NULL
;
7104 inet_sk(sk
)->inet_num
= 0;
7105 sctp_bucket_destroy(pp
);
7106 spin_unlock(&head
->lock
);
7109 void sctp_put_port(struct sock
*sk
)
7112 __sctp_put_port(sk
);
7117 * The system picks an ephemeral port and choose an address set equivalent
7118 * to binding with a wildcard address.
7119 * One of those addresses will be the primary address for the association.
7120 * This automatically enables the multihoming capability of SCTP.
7122 static int sctp_autobind(struct sock
*sk
)
7124 union sctp_addr autoaddr
;
7128 /* Initialize a local sockaddr structure to INADDR_ANY. */
7129 af
= sctp_sk(sk
)->pf
->af
;
7131 port
= htons(inet_sk(sk
)->inet_num
);
7132 af
->inaddr_any(&autoaddr
, port
);
7134 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
7137 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
7140 * 4.2 The cmsghdr Structure *
7142 * When ancillary data is sent or received, any number of ancillary data
7143 * objects can be specified by the msg_control and msg_controllen members of
7144 * the msghdr structure, because each object is preceded by
7145 * a cmsghdr structure defining the object's length (the cmsg_len member).
7146 * Historically Berkeley-derived implementations have passed only one object
7147 * at a time, but this API allows multiple objects to be
7148 * passed in a single call to sendmsg() or recvmsg(). The following example
7149 * shows two ancillary data objects in a control buffer.
7151 * |<--------------------------- msg_controllen -------------------------->|
7154 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
7156 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
7159 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
7161 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
7164 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7165 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
7167 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
7169 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7176 static int sctp_msghdr_parse(const struct msghdr
*msg
, sctp_cmsgs_t
*cmsgs
)
7178 struct cmsghdr
*cmsg
;
7179 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
7181 for_each_cmsghdr(cmsg
, my_msg
) {
7182 if (!CMSG_OK(my_msg
, cmsg
))
7185 /* Should we parse this header or ignore? */
7186 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
7189 /* Strictly check lengths following example in SCM code. */
7190 switch (cmsg
->cmsg_type
) {
7192 /* SCTP Socket API Extension
7193 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
7195 * This cmsghdr structure provides information for
7196 * initializing new SCTP associations with sendmsg().
7197 * The SCTP_INITMSG socket option uses this same data
7198 * structure. This structure is not used for
7201 * cmsg_level cmsg_type cmsg_data[]
7202 * ------------ ------------ ----------------------
7203 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
7205 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_initmsg
)))
7208 cmsgs
->init
= CMSG_DATA(cmsg
);
7212 /* SCTP Socket API Extension
7213 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
7215 * This cmsghdr structure specifies SCTP options for
7216 * sendmsg() and describes SCTP header information
7217 * about a received message through recvmsg().
7219 * cmsg_level cmsg_type cmsg_data[]
7220 * ------------ ------------ ----------------------
7221 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
7223 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
7226 cmsgs
->srinfo
= CMSG_DATA(cmsg
);
7228 if (cmsgs
->srinfo
->sinfo_flags
&
7229 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
7230 SCTP_SACK_IMMEDIATELY
| SCTP_PR_SCTP_MASK
|
7231 SCTP_ABORT
| SCTP_EOF
))
7236 /* SCTP Socket API Extension
7237 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
7239 * This cmsghdr structure specifies SCTP options for
7240 * sendmsg(). This structure and SCTP_RCVINFO replaces
7241 * SCTP_SNDRCV which has been deprecated.
7243 * cmsg_level cmsg_type cmsg_data[]
7244 * ------------ ------------ ---------------------
7245 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
7247 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_sndinfo
)))
7250 cmsgs
->sinfo
= CMSG_DATA(cmsg
);
7252 if (cmsgs
->sinfo
->snd_flags
&
7253 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
7254 SCTP_SACK_IMMEDIATELY
| SCTP_PR_SCTP_MASK
|
7255 SCTP_ABORT
| SCTP_EOF
))
7267 * Wait for a packet..
7268 * Note: This function is the same function as in core/datagram.c
7269 * with a few modifications to make lksctp work.
7271 static int sctp_wait_for_packet(struct sock
*sk
, int *err
, long *timeo_p
)
7276 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
7278 /* Socket errors? */
7279 error
= sock_error(sk
);
7283 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7286 /* Socket shut down? */
7287 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7290 /* Sequenced packets can come disconnected. If so we report the
7295 /* Is there a good reason to think that we may receive some data? */
7296 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
7299 /* Handle signals. */
7300 if (signal_pending(current
))
7303 /* Let another process have a go. Since we are going to sleep
7304 * anyway. Note: This may cause odd behaviors if the message
7305 * does not fit in the user's buffer, but this seems to be the
7306 * only way to honor MSG_DONTWAIT realistically.
7309 *timeo_p
= schedule_timeout(*timeo_p
);
7313 finish_wait(sk_sleep(sk
), &wait
);
7317 error
= sock_intr_errno(*timeo_p
);
7320 finish_wait(sk_sleep(sk
), &wait
);
7325 /* Receive a datagram.
7326 * Note: This is pretty much the same routine as in core/datagram.c
7327 * with a few changes to make lksctp work.
7329 struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
7330 int noblock
, int *err
)
7333 struct sk_buff
*skb
;
7336 timeo
= sock_rcvtimeo(sk
, noblock
);
7338 pr_debug("%s: timeo:%ld, max:%ld\n", __func__
, timeo
,
7339 MAX_SCHEDULE_TIMEOUT
);
7342 /* Again only user level code calls this function,
7343 * so nothing interrupt level
7344 * will suddenly eat the receive_queue.
7346 * Look at current nfs client by the way...
7347 * However, this function was correct in any case. 8)
7349 if (flags
& MSG_PEEK
) {
7350 skb
= skb_peek(&sk
->sk_receive_queue
);
7352 atomic_inc(&skb
->users
);
7354 skb
= __skb_dequeue(&sk
->sk_receive_queue
);
7360 /* Caller is allowed not to check sk->sk_err before calling. */
7361 error
= sock_error(sk
);
7365 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7368 if (sk_can_busy_loop(sk
) &&
7369 sk_busy_loop(sk
, noblock
))
7372 /* User doesn't want to wait. */
7376 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
7385 /* If sndbuf has changed, wake up per association sndbuf waiters. */
7386 static void __sctp_write_space(struct sctp_association
*asoc
)
7388 struct sock
*sk
= asoc
->base
.sk
;
7390 if (sctp_wspace(asoc
) <= 0)
7393 if (waitqueue_active(&asoc
->wait
))
7394 wake_up_interruptible(&asoc
->wait
);
7396 if (sctp_writeable(sk
)) {
7397 struct socket_wq
*wq
;
7400 wq
= rcu_dereference(sk
->sk_wq
);
7402 if (waitqueue_active(&wq
->wait
))
7403 wake_up_interruptible(&wq
->wait
);
7405 /* Note that we try to include the Async I/O support
7406 * here by modeling from the current TCP/UDP code.
7407 * We have not tested with it yet.
7409 if (!(sk
->sk_shutdown
& SEND_SHUTDOWN
))
7410 sock_wake_async(wq
, SOCK_WAKE_SPACE
, POLL_OUT
);
7416 static void sctp_wake_up_waiters(struct sock
*sk
,
7417 struct sctp_association
*asoc
)
7419 struct sctp_association
*tmp
= asoc
;
7421 /* We do accounting for the sndbuf space per association,
7422 * so we only need to wake our own association.
7424 if (asoc
->ep
->sndbuf_policy
)
7425 return __sctp_write_space(asoc
);
7427 /* If association goes down and is just flushing its
7428 * outq, then just normally notify others.
7430 if (asoc
->base
.dead
)
7431 return sctp_write_space(sk
);
7433 /* Accounting for the sndbuf space is per socket, so we
7434 * need to wake up others, try to be fair and in case of
7435 * other associations, let them have a go first instead
7436 * of just doing a sctp_write_space() call.
7438 * Note that we reach sctp_wake_up_waiters() only when
7439 * associations free up queued chunks, thus we are under
7440 * lock and the list of associations on a socket is
7441 * guaranteed not to change.
7443 for (tmp
= list_next_entry(tmp
, asocs
); 1;
7444 tmp
= list_next_entry(tmp
, asocs
)) {
7445 /* Manually skip the head element. */
7446 if (&tmp
->asocs
== &((sctp_sk(sk
))->ep
->asocs
))
7448 /* Wake up association. */
7449 __sctp_write_space(tmp
);
7450 /* We've reached the end. */
7456 /* Do accounting for the sndbuf space.
7457 * Decrement the used sndbuf space of the corresponding association by the
7458 * data size which was just transmitted(freed).
7460 static void sctp_wfree(struct sk_buff
*skb
)
7462 struct sctp_chunk
*chunk
= skb_shinfo(skb
)->destructor_arg
;
7463 struct sctp_association
*asoc
= chunk
->asoc
;
7464 struct sock
*sk
= asoc
->base
.sk
;
7466 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
7467 sizeof(struct sk_buff
) +
7468 sizeof(struct sctp_chunk
);
7470 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
7473 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
7475 sk
->sk_wmem_queued
-= skb
->truesize
;
7476 sk_mem_uncharge(sk
, skb
->truesize
);
7479 sctp_wake_up_waiters(sk
, asoc
);
7481 sctp_association_put(asoc
);
7484 /* Do accounting for the receive space on the socket.
7485 * Accounting for the association is done in ulpevent.c
7486 * We set this as a destructor for the cloned data skbs so that
7487 * accounting is done at the correct time.
7489 void sctp_sock_rfree(struct sk_buff
*skb
)
7491 struct sock
*sk
= skb
->sk
;
7492 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
7494 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
7497 * Mimic the behavior of sock_rfree
7499 sk_mem_uncharge(sk
, event
->rmem_len
);
7503 /* Helper function to wait for space in the sndbuf. */
7504 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
7507 struct sock
*sk
= asoc
->base
.sk
;
7509 long current_timeo
= *timeo_p
;
7512 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__
, asoc
,
7515 /* Increment the association's refcnt. */
7516 sctp_association_hold(asoc
);
7518 /* Wait on the association specific sndbuf space. */
7520 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
7521 TASK_INTERRUPTIBLE
);
7524 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
7527 if (signal_pending(current
))
7528 goto do_interrupted
;
7529 if (msg_len
<= sctp_wspace(asoc
))
7532 /* Let another process have a go. Since we are going
7536 current_timeo
= schedule_timeout(current_timeo
);
7537 BUG_ON(sk
!= asoc
->base
.sk
);
7540 *timeo_p
= current_timeo
;
7544 finish_wait(&asoc
->wait
, &wait
);
7546 /* Release the association's refcnt. */
7547 sctp_association_put(asoc
);
7556 err
= sock_intr_errno(*timeo_p
);
7564 void sctp_data_ready(struct sock
*sk
)
7566 struct socket_wq
*wq
;
7569 wq
= rcu_dereference(sk
->sk_wq
);
7570 if (skwq_has_sleeper(wq
))
7571 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
7572 POLLRDNORM
| POLLRDBAND
);
7573 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
7577 /* If socket sndbuf has changed, wake up all per association waiters. */
7578 void sctp_write_space(struct sock
*sk
)
7580 struct sctp_association
*asoc
;
7582 /* Wake up the tasks in each wait queue. */
7583 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
7584 __sctp_write_space(asoc
);
7588 /* Is there any sndbuf space available on the socket?
7590 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
7591 * associations on the same socket. For a UDP-style socket with
7592 * multiple associations, it is possible for it to be "unwriteable"
7593 * prematurely. I assume that this is acceptable because
7594 * a premature "unwriteable" is better than an accidental "writeable" which
7595 * would cause an unwanted block under certain circumstances. For the 1-1
7596 * UDP-style sockets or TCP-style sockets, this code should work.
7599 static int sctp_writeable(struct sock
*sk
)
7603 amt
= sk
->sk_sndbuf
- sk_wmem_alloc_get(sk
);
7609 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7610 * returns immediately with EINPROGRESS.
7612 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
7614 struct sock
*sk
= asoc
->base
.sk
;
7616 long current_timeo
= *timeo_p
;
7619 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__
, asoc
, *timeo_p
);
7621 /* Increment the association's refcnt. */
7622 sctp_association_hold(asoc
);
7625 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
7626 TASK_INTERRUPTIBLE
);
7629 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7631 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
7634 if (signal_pending(current
))
7635 goto do_interrupted
;
7637 if (sctp_state(asoc
, ESTABLISHED
))
7640 /* Let another process have a go. Since we are going
7644 current_timeo
= schedule_timeout(current_timeo
);
7647 *timeo_p
= current_timeo
;
7651 finish_wait(&asoc
->wait
, &wait
);
7653 /* Release the association's refcnt. */
7654 sctp_association_put(asoc
);
7659 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
7662 err
= -ECONNREFUSED
;
7666 err
= sock_intr_errno(*timeo_p
);
7674 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
7676 struct sctp_endpoint
*ep
;
7680 ep
= sctp_sk(sk
)->ep
;
7684 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
7685 TASK_INTERRUPTIBLE
);
7687 if (list_empty(&ep
->asocs
)) {
7689 timeo
= schedule_timeout(timeo
);
7694 if (!sctp_sstate(sk
, LISTENING
))
7698 if (!list_empty(&ep
->asocs
))
7701 err
= sock_intr_errno(timeo
);
7702 if (signal_pending(current
))
7710 finish_wait(sk_sleep(sk
), &wait
);
7715 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
7720 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
7721 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
7724 timeout
= schedule_timeout(timeout
);
7726 } while (!signal_pending(current
) && timeout
);
7728 finish_wait(sk_sleep(sk
), &wait
);
7731 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
7733 struct sk_buff
*frag
;
7738 /* Don't forget the fragments. */
7739 skb_walk_frags(skb
, frag
)
7740 sctp_skb_set_owner_r_frag(frag
, sk
);
7743 sctp_skb_set_owner_r(skb
, sk
);
7746 void sctp_copy_sock(struct sock
*newsk
, struct sock
*sk
,
7747 struct sctp_association
*asoc
)
7749 struct inet_sock
*inet
= inet_sk(sk
);
7750 struct inet_sock
*newinet
;
7752 newsk
->sk_type
= sk
->sk_type
;
7753 newsk
->sk_bound_dev_if
= sk
->sk_bound_dev_if
;
7754 newsk
->sk_flags
= sk
->sk_flags
;
7755 newsk
->sk_tsflags
= sk
->sk_tsflags
;
7756 newsk
->sk_no_check_tx
= sk
->sk_no_check_tx
;
7757 newsk
->sk_no_check_rx
= sk
->sk_no_check_rx
;
7758 newsk
->sk_reuse
= sk
->sk_reuse
;
7760 newsk
->sk_shutdown
= sk
->sk_shutdown
;
7761 newsk
->sk_destruct
= sctp_destruct_sock
;
7762 newsk
->sk_family
= sk
->sk_family
;
7763 newsk
->sk_protocol
= IPPROTO_SCTP
;
7764 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
7765 newsk
->sk_sndbuf
= sk
->sk_sndbuf
;
7766 newsk
->sk_rcvbuf
= sk
->sk_rcvbuf
;
7767 newsk
->sk_lingertime
= sk
->sk_lingertime
;
7768 newsk
->sk_rcvtimeo
= sk
->sk_rcvtimeo
;
7769 newsk
->sk_sndtimeo
= sk
->sk_sndtimeo
;
7770 newsk
->sk_rxhash
= sk
->sk_rxhash
;
7772 newinet
= inet_sk(newsk
);
7774 /* Initialize sk's sport, dport, rcv_saddr and daddr for
7775 * getsockname() and getpeername()
7777 newinet
->inet_sport
= inet
->inet_sport
;
7778 newinet
->inet_saddr
= inet
->inet_saddr
;
7779 newinet
->inet_rcv_saddr
= inet
->inet_rcv_saddr
;
7780 newinet
->inet_dport
= htons(asoc
->peer
.port
);
7781 newinet
->pmtudisc
= inet
->pmtudisc
;
7782 newinet
->inet_id
= asoc
->next_tsn
^ jiffies
;
7784 newinet
->uc_ttl
= inet
->uc_ttl
;
7785 newinet
->mc_loop
= 1;
7786 newinet
->mc_ttl
= 1;
7787 newinet
->mc_index
= 0;
7788 newinet
->mc_list
= NULL
;
7790 if (newsk
->sk_flags
& SK_FLAGS_TIMESTAMP
)
7791 net_enable_timestamp();
7793 security_sk_clone(sk
, newsk
);
7796 static inline void sctp_copy_descendant(struct sock
*sk_to
,
7797 const struct sock
*sk_from
)
7799 int ancestor_size
= sizeof(struct inet_sock
) +
7800 sizeof(struct sctp_sock
) -
7801 offsetof(struct sctp_sock
, auto_asconf_list
);
7803 if (sk_from
->sk_family
== PF_INET6
)
7804 ancestor_size
+= sizeof(struct ipv6_pinfo
);
7806 __inet_sk_copy_descendant(sk_to
, sk_from
, ancestor_size
);
7809 /* Populate the fields of the newsk from the oldsk and migrate the assoc
7810 * and its messages to the newsk.
7812 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
7813 struct sctp_association
*assoc
,
7814 sctp_socket_type_t type
)
7816 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
7817 struct sctp_sock
*newsp
= sctp_sk(newsk
);
7818 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
7819 struct sctp_endpoint
*newep
= newsp
->ep
;
7820 struct sk_buff
*skb
, *tmp
;
7821 struct sctp_ulpevent
*event
;
7822 struct sctp_bind_hashbucket
*head
;
7824 /* Migrate socket buffer sizes and all the socket level options to the
7827 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
7828 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
7829 /* Brute force copy old sctp opt. */
7830 sctp_copy_descendant(newsk
, oldsk
);
7832 /* Restore the ep value that was overwritten with the above structure
7838 /* Hook this new socket in to the bind_hash list. */
7839 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(oldsk
),
7840 inet_sk(oldsk
)->inet_num
)];
7841 spin_lock_bh(&head
->lock
);
7842 pp
= sctp_sk(oldsk
)->bind_hash
;
7843 sk_add_bind_node(newsk
, &pp
->owner
);
7844 sctp_sk(newsk
)->bind_hash
= pp
;
7845 inet_sk(newsk
)->inet_num
= inet_sk(oldsk
)->inet_num
;
7846 spin_unlock_bh(&head
->lock
);
7848 /* Copy the bind_addr list from the original endpoint to the new
7849 * endpoint so that we can handle restarts properly
7851 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
7852 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
7854 /* Move any messages in the old socket's receive queue that are for the
7855 * peeled off association to the new socket's receive queue.
7857 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
7858 event
= sctp_skb2event(skb
);
7859 if (event
->asoc
== assoc
) {
7860 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
7861 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
7862 sctp_skb_set_owner_r_frag(skb
, newsk
);
7866 /* Clean up any messages pending delivery due to partial
7867 * delivery. Three cases:
7868 * 1) No partial deliver; no work.
7869 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
7870 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
7872 skb_queue_head_init(&newsp
->pd_lobby
);
7873 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
7875 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
7876 struct sk_buff_head
*queue
;
7878 /* Decide which queue to move pd_lobby skbs to. */
7879 if (assoc
->ulpq
.pd_mode
) {
7880 queue
= &newsp
->pd_lobby
;
7882 queue
= &newsk
->sk_receive_queue
;
7884 /* Walk through the pd_lobby, looking for skbs that
7885 * need moved to the new socket.
7887 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
7888 event
= sctp_skb2event(skb
);
7889 if (event
->asoc
== assoc
) {
7890 __skb_unlink(skb
, &oldsp
->pd_lobby
);
7891 __skb_queue_tail(queue
, skb
);
7892 sctp_skb_set_owner_r_frag(skb
, newsk
);
7896 /* Clear up any skbs waiting for the partial
7897 * delivery to finish.
7899 if (assoc
->ulpq
.pd_mode
)
7900 sctp_clear_pd(oldsk
, NULL
);
7904 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
)
7905 sctp_skb_set_owner_r_frag(skb
, newsk
);
7907 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
)
7908 sctp_skb_set_owner_r_frag(skb
, newsk
);
7910 /* Set the type of socket to indicate that it is peeled off from the
7911 * original UDP-style socket or created with the accept() call on a
7912 * TCP-style socket..
7916 /* Mark the new socket "in-use" by the user so that any packets
7917 * that may arrive on the association after we've moved it are
7918 * queued to the backlog. This prevents a potential race between
7919 * backlog processing on the old socket and new-packet processing
7920 * on the new socket.
7922 * The caller has just allocated newsk so we can guarantee that other
7923 * paths won't try to lock it and then oldsk.
7925 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
7926 sctp_assoc_migrate(assoc
, newsk
);
7928 /* If the association on the newsk is already closed before accept()
7929 * is called, set RCV_SHUTDOWN flag.
7931 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
)) {
7932 newsk
->sk_state
= SCTP_SS_CLOSED
;
7933 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
7935 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
7938 release_sock(newsk
);
7942 /* This proto struct describes the ULP interface for SCTP. */
7943 struct proto sctp_prot
= {
7945 .owner
= THIS_MODULE
,
7946 .close
= sctp_close
,
7947 .connect
= sctp_connect
,
7948 .disconnect
= sctp_disconnect
,
7949 .accept
= sctp_accept
,
7950 .ioctl
= sctp_ioctl
,
7951 .init
= sctp_init_sock
,
7952 .destroy
= sctp_destroy_sock
,
7953 .shutdown
= sctp_shutdown
,
7954 .setsockopt
= sctp_setsockopt
,
7955 .getsockopt
= sctp_getsockopt
,
7956 .sendmsg
= sctp_sendmsg
,
7957 .recvmsg
= sctp_recvmsg
,
7959 .backlog_rcv
= sctp_backlog_rcv
,
7961 .unhash
= sctp_unhash
,
7962 .get_port
= sctp_get_port
,
7963 .obj_size
= sizeof(struct sctp_sock
),
7964 .sysctl_mem
= sysctl_sctp_mem
,
7965 .sysctl_rmem
= sysctl_sctp_rmem
,
7966 .sysctl_wmem
= sysctl_sctp_wmem
,
7967 .memory_pressure
= &sctp_memory_pressure
,
7968 .enter_memory_pressure
= sctp_enter_memory_pressure
,
7969 .memory_allocated
= &sctp_memory_allocated
,
7970 .sockets_allocated
= &sctp_sockets_allocated
,
7973 #if IS_ENABLED(CONFIG_IPV6)
7975 #include <net/transp_v6.h>
7976 static void sctp_v6_destroy_sock(struct sock
*sk
)
7978 sctp_destroy_sock(sk
);
7979 inet6_destroy_sock(sk
);
7982 struct proto sctpv6_prot
= {
7984 .owner
= THIS_MODULE
,
7985 .close
= sctp_close
,
7986 .connect
= sctp_connect
,
7987 .disconnect
= sctp_disconnect
,
7988 .accept
= sctp_accept
,
7989 .ioctl
= sctp_ioctl
,
7990 .init
= sctp_init_sock
,
7991 .destroy
= sctp_v6_destroy_sock
,
7992 .shutdown
= sctp_shutdown
,
7993 .setsockopt
= sctp_setsockopt
,
7994 .getsockopt
= sctp_getsockopt
,
7995 .sendmsg
= sctp_sendmsg
,
7996 .recvmsg
= sctp_recvmsg
,
7998 .backlog_rcv
= sctp_backlog_rcv
,
8000 .unhash
= sctp_unhash
,
8001 .get_port
= sctp_get_port
,
8002 .obj_size
= sizeof(struct sctp6_sock
),
8003 .sysctl_mem
= sysctl_sctp_mem
,
8004 .sysctl_rmem
= sysctl_sctp_rmem
,
8005 .sysctl_wmem
= sysctl_sctp_wmem
,
8006 .memory_pressure
= &sctp_memory_pressure
,
8007 .enter_memory_pressure
= sctp_enter_memory_pressure
,
8008 .memory_allocated
= &sctp_memory_allocated
,
8009 .sockets_allocated
= &sctp_sockets_allocated
,
8011 #endif /* IS_ENABLED(CONFIG_IPV6) */