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, write to
32 * the Free Software Foundation, 59 Temple Place - Suite 330,
33 * Boston, MA 02111-1307, USA.
35 * Please send any bug reports or fixes you make to the
37 * lksctp developers <linux-sctp@vger.kernel.org>
39 * Written or modified by:
40 * La Monte H.P. Yarroll <piggy@acm.org>
41 * Narasimha Budihal <narsi@refcode.org>
42 * Karl Knutson <karl@athena.chicago.il.us>
43 * Jon Grimm <jgrimm@us.ibm.com>
44 * Xingang Guo <xingang.guo@intel.com>
45 * Daisy Chang <daisyc@us.ibm.com>
46 * Sridhar Samudrala <samudrala@us.ibm.com>
47 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
48 * Ardelle Fan <ardelle.fan@intel.com>
49 * Ryan Layer <rmlayer@us.ibm.com>
50 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
51 * Kevin Gao <kevin.gao@intel.com>
54 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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/crypto.h>
66 #include <linux/slab.h>
67 #include <linux/file.h>
71 #include <net/route.h>
73 #include <net/inet_common.h>
75 #include <linux/socket.h> /* for sa_family_t */
76 #include <linux/export.h>
78 #include <net/sctp/sctp.h>
79 #include <net/sctp/sm.h>
81 /* Forward declarations for internal helper functions. */
82 static int sctp_writeable(struct sock
*sk
);
83 static void sctp_wfree(struct sk_buff
*skb
);
84 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
86 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
);
87 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
88 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
89 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
90 static void sctp_destruct_sock(struct sock
*sk
);
91 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
92 union sctp_addr
*addr
, int len
);
93 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
94 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
95 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
96 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
97 static int sctp_send_asconf(struct sctp_association
*asoc
,
98 struct sctp_chunk
*chunk
);
99 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
100 static int sctp_autobind(struct sock
*sk
);
101 static void sctp_sock_migrate(struct sock
*, struct sock
*,
102 struct sctp_association
*, sctp_socket_type_t
);
104 extern struct kmem_cache
*sctp_bucket_cachep
;
105 extern long sysctl_sctp_mem
[3];
106 extern int sysctl_sctp_rmem
[3];
107 extern int sysctl_sctp_wmem
[3];
109 static int sctp_memory_pressure
;
110 static atomic_long_t sctp_memory_allocated
;
111 struct percpu_counter sctp_sockets_allocated
;
113 static void sctp_enter_memory_pressure(struct sock
*sk
)
115 sctp_memory_pressure
= 1;
119 /* Get the sndbuf space available at the time on the association. */
120 static inline int sctp_wspace(struct sctp_association
*asoc
)
124 if (asoc
->ep
->sndbuf_policy
)
125 amt
= asoc
->sndbuf_used
;
127 amt
= sk_wmem_alloc_get(asoc
->base
.sk
);
129 if (amt
>= asoc
->base
.sk
->sk_sndbuf
) {
130 if (asoc
->base
.sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)
133 amt
= sk_stream_wspace(asoc
->base
.sk
);
138 amt
= asoc
->base
.sk
->sk_sndbuf
- amt
;
143 /* Increment the used sndbuf space count of the corresponding association by
144 * the size of the outgoing data chunk.
145 * Also, set the skb destructor for sndbuf accounting later.
147 * Since it is always 1-1 between chunk and skb, and also a new skb is always
148 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
149 * destructor in the data chunk skb for the purpose of the sndbuf space
152 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
154 struct sctp_association
*asoc
= chunk
->asoc
;
155 struct sock
*sk
= asoc
->base
.sk
;
157 /* The sndbuf space is tracked per association. */
158 sctp_association_hold(asoc
);
160 skb_set_owner_w(chunk
->skb
, sk
);
162 chunk
->skb
->destructor
= sctp_wfree
;
163 /* Save the chunk pointer in skb for sctp_wfree to use later. */
164 *((struct sctp_chunk
**)(chunk
->skb
->cb
)) = chunk
;
166 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
167 sizeof(struct sk_buff
) +
168 sizeof(struct sctp_chunk
);
170 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
171 sk
->sk_wmem_queued
+= chunk
->skb
->truesize
;
172 sk_mem_charge(sk
, chunk
->skb
->truesize
);
175 /* Verify that this is a valid address. */
176 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
181 /* Verify basic sockaddr. */
182 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
186 /* Is this a valid SCTP address? */
187 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
190 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
196 /* Look up the association by its id. If this is not a UDP-style
197 * socket, the ID field is always ignored.
199 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
201 struct sctp_association
*asoc
= NULL
;
203 /* If this is not a UDP-style socket, assoc id should be ignored. */
204 if (!sctp_style(sk
, UDP
)) {
205 /* Return NULL if the socket state is not ESTABLISHED. It
206 * could be a TCP-style listening socket or a socket which
207 * hasn't yet called connect() to establish an association.
209 if (!sctp_sstate(sk
, ESTABLISHED
))
212 /* Get the first and the only association from the list. */
213 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
214 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
215 struct sctp_association
, asocs
);
219 /* Otherwise this is a UDP-style socket. */
220 if (!id
|| (id
== (sctp_assoc_t
)-1))
223 spin_lock_bh(&sctp_assocs_id_lock
);
224 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
225 spin_unlock_bh(&sctp_assocs_id_lock
);
227 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
233 /* Look up the transport from an address and an assoc id. If both address and
234 * id are specified, the associations matching the address and the id should be
237 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
238 struct sockaddr_storage
*addr
,
241 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
242 struct sctp_transport
*transport
;
243 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
245 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
252 id_asoc
= sctp_id2assoc(sk
, id
);
253 if (id_asoc
&& (id_asoc
!= addr_asoc
))
256 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
257 (union sctp_addr
*)addr
);
262 /* API 3.1.2 bind() - UDP Style Syntax
263 * The syntax of bind() is,
265 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
267 * sd - the socket descriptor returned by socket().
268 * addr - the address structure (struct sockaddr_in or struct
269 * sockaddr_in6 [RFC 2553]),
270 * addr_len - the size of the address structure.
272 static int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
278 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__
, sk
,
281 /* Disallow binding twice. */
282 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
283 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
288 sctp_release_sock(sk
);
293 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
295 /* Verify this is a valid sockaddr. */
296 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
297 union sctp_addr
*addr
, int len
)
301 /* Check minimum size. */
302 if (len
< sizeof (struct sockaddr
))
305 /* V4 mapped address are really of AF_INET family */
306 if (addr
->sa
.sa_family
== AF_INET6
&&
307 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
)) {
308 if (!opt
->pf
->af_supported(AF_INET
, opt
))
311 /* Does this PF support this AF? */
312 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
316 /* If we get this far, af is valid. */
317 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
319 if (len
< af
->sockaddr_len
)
325 /* Bind a local address either to an endpoint or to an association. */
326 static int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
328 struct net
*net
= sock_net(sk
);
329 struct sctp_sock
*sp
= sctp_sk(sk
);
330 struct sctp_endpoint
*ep
= sp
->ep
;
331 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
336 /* Common sockaddr verification. */
337 af
= sctp_sockaddr_af(sp
, addr
, len
);
339 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
340 __func__
, sk
, addr
, len
);
344 snum
= ntohs(addr
->v4
.sin_port
);
346 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
347 __func__
, sk
, &addr
->sa
, bp
->port
, snum
, len
);
349 /* PF specific bind() address verification. */
350 if (!sp
->pf
->bind_verify(sp
, addr
))
351 return -EADDRNOTAVAIL
;
353 /* We must either be unbound, or bind to the same port.
354 * It's OK to allow 0 ports if we are already bound.
355 * We'll just inhert an already bound port in this case
360 else if (snum
!= bp
->port
) {
361 pr_debug("%s: new port %d doesn't match existing port "
362 "%d\n", __func__
, snum
, bp
->port
);
367 if (snum
&& snum
< PROT_SOCK
&&
368 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
))
371 /* See if the address matches any of the addresses we may have
372 * already bound before checking against other endpoints.
374 if (sctp_bind_addr_match(bp
, addr
, sp
))
377 /* Make sure we are allowed to bind here.
378 * The function sctp_get_port_local() does duplicate address
381 addr
->v4
.sin_port
= htons(snum
);
382 if ((ret
= sctp_get_port_local(sk
, addr
))) {
386 /* Refresh ephemeral port. */
388 bp
->port
= inet_sk(sk
)->inet_num
;
390 /* Add the address to the bind address list.
391 * Use GFP_ATOMIC since BHs will be disabled.
393 ret
= sctp_add_bind_addr(bp
, addr
, SCTP_ADDR_SRC
, GFP_ATOMIC
);
395 /* Copy back into socket for getsockname() use. */
397 inet_sk(sk
)->inet_sport
= htons(inet_sk(sk
)->inet_num
);
398 af
->to_sk_saddr(addr
, sk
);
404 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
406 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
407 * at any one time. If a sender, after sending an ASCONF chunk, decides
408 * it needs to transfer another ASCONF Chunk, it MUST wait until the
409 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
410 * subsequent ASCONF. Note this restriction binds each side, so at any
411 * time two ASCONF may be in-transit on any given association (one sent
412 * from each endpoint).
414 static int sctp_send_asconf(struct sctp_association
*asoc
,
415 struct sctp_chunk
*chunk
)
417 struct net
*net
= sock_net(asoc
->base
.sk
);
420 /* If there is an outstanding ASCONF chunk, queue it for later
423 if (asoc
->addip_last_asconf
) {
424 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
428 /* Hold the chunk until an ASCONF_ACK is received. */
429 sctp_chunk_hold(chunk
);
430 retval
= sctp_primitive_ASCONF(net
, asoc
, chunk
);
432 sctp_chunk_free(chunk
);
434 asoc
->addip_last_asconf
= chunk
;
440 /* Add a list of addresses as bind addresses to local endpoint or
443 * Basically run through each address specified in the addrs/addrcnt
444 * array/length pair, determine if it is IPv6 or IPv4 and call
445 * sctp_do_bind() on it.
447 * If any of them fails, then the operation will be reversed and the
448 * ones that were added will be removed.
450 * Only sctp_setsockopt_bindx() is supposed to call this function.
452 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
457 struct sockaddr
*sa_addr
;
460 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__
, sk
,
464 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
465 /* The list may contain either IPv4 or IPv6 address;
466 * determine the address length for walking thru the list.
469 af
= sctp_get_af_specific(sa_addr
->sa_family
);
475 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
478 addr_buf
+= af
->sockaddr_len
;
482 /* Failed. Cleanup the ones that have been added */
484 sctp_bindx_rem(sk
, addrs
, cnt
);
492 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
493 * associations that are part of the endpoint indicating that a list of local
494 * addresses are added to the endpoint.
496 * If any of the addresses is already in the bind address list of the
497 * association, we do not send the chunk for that association. But it will not
498 * affect other associations.
500 * Only sctp_setsockopt_bindx() is supposed to call this function.
502 static int sctp_send_asconf_add_ip(struct sock
*sk
,
503 struct sockaddr
*addrs
,
506 struct net
*net
= sock_net(sk
);
507 struct sctp_sock
*sp
;
508 struct sctp_endpoint
*ep
;
509 struct sctp_association
*asoc
;
510 struct sctp_bind_addr
*bp
;
511 struct sctp_chunk
*chunk
;
512 struct sctp_sockaddr_entry
*laddr
;
513 union sctp_addr
*addr
;
514 union sctp_addr saveaddr
;
521 if (!net
->sctp
.addip_enable
)
527 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
528 __func__
, sk
, addrs
, addrcnt
);
530 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
531 if (!asoc
->peer
.asconf_capable
)
534 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
537 if (!sctp_state(asoc
, ESTABLISHED
))
540 /* Check if any address in the packed array of addresses is
541 * in the bind address list of the association. If so,
542 * do not send the asconf chunk to its peer, but continue with
543 * other associations.
546 for (i
= 0; i
< addrcnt
; i
++) {
548 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
554 if (sctp_assoc_lookup_laddr(asoc
, addr
))
557 addr_buf
+= af
->sockaddr_len
;
562 /* Use the first valid address in bind addr list of
563 * association as Address Parameter of ASCONF CHUNK.
565 bp
= &asoc
->base
.bind_addr
;
566 p
= bp
->address_list
.next
;
567 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
568 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
569 addrcnt
, SCTP_PARAM_ADD_IP
);
575 /* Add the new addresses to the bind address list with
576 * use_as_src set to 0.
579 for (i
= 0; i
< addrcnt
; i
++) {
581 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
582 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
583 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
584 SCTP_ADDR_NEW
, GFP_ATOMIC
);
585 addr_buf
+= af
->sockaddr_len
;
587 if (asoc
->src_out_of_asoc_ok
) {
588 struct sctp_transport
*trans
;
590 list_for_each_entry(trans
,
591 &asoc
->peer
.transport_addr_list
, transports
) {
592 /* Clear the source and route cache */
593 dst_release(trans
->dst
);
594 trans
->cwnd
= min(4*asoc
->pathmtu
, max_t(__u32
,
595 2*asoc
->pathmtu
, 4380));
596 trans
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
597 trans
->rto
= asoc
->rto_initial
;
598 sctp_max_rto(asoc
, trans
);
599 trans
->rtt
= trans
->srtt
= trans
->rttvar
= 0;
600 sctp_transport_route(trans
, NULL
,
601 sctp_sk(asoc
->base
.sk
));
604 retval
= sctp_send_asconf(asoc
, chunk
);
611 /* Remove a list of addresses from bind addresses list. Do not remove the
614 * Basically run through each address specified in the addrs/addrcnt
615 * array/length pair, determine if it is IPv6 or IPv4 and call
616 * sctp_del_bind() on it.
618 * If any of them fails, then the operation will be reversed and the
619 * ones that were removed will be added back.
621 * At least one address has to be left; if only one address is
622 * available, the operation will return -EBUSY.
624 * Only sctp_setsockopt_bindx() is supposed to call this function.
626 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
628 struct sctp_sock
*sp
= sctp_sk(sk
);
629 struct sctp_endpoint
*ep
= sp
->ep
;
631 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
634 union sctp_addr
*sa_addr
;
637 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
638 __func__
, sk
, addrs
, addrcnt
);
641 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
642 /* If the bind address list is empty or if there is only one
643 * bind address, there is nothing more to be removed (we need
644 * at least one address here).
646 if (list_empty(&bp
->address_list
) ||
647 (sctp_list_single_entry(&bp
->address_list
))) {
653 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
659 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
660 retval
= -EADDRNOTAVAIL
;
664 if (sa_addr
->v4
.sin_port
&&
665 sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
670 if (!sa_addr
->v4
.sin_port
)
671 sa_addr
->v4
.sin_port
= htons(bp
->port
);
673 /* FIXME - There is probably a need to check if sk->sk_saddr and
674 * sk->sk_rcv_addr are currently set to one of the addresses to
675 * be removed. This is something which needs to be looked into
676 * when we are fixing the outstanding issues with multi-homing
677 * socket routing and failover schemes. Refer to comments in
678 * sctp_do_bind(). -daisy
680 retval
= sctp_del_bind_addr(bp
, sa_addr
);
682 addr_buf
+= af
->sockaddr_len
;
685 /* Failed. Add the ones that has been removed back */
687 sctp_bindx_add(sk
, addrs
, cnt
);
695 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
696 * the associations that are part of the endpoint indicating that a list of
697 * local addresses are removed from the endpoint.
699 * If any of the addresses is already in the bind address list of the
700 * association, we do not send the chunk for that association. But it will not
701 * affect other associations.
703 * Only sctp_setsockopt_bindx() is supposed to call this function.
705 static int sctp_send_asconf_del_ip(struct sock
*sk
,
706 struct sockaddr
*addrs
,
709 struct net
*net
= sock_net(sk
);
710 struct sctp_sock
*sp
;
711 struct sctp_endpoint
*ep
;
712 struct sctp_association
*asoc
;
713 struct sctp_transport
*transport
;
714 struct sctp_bind_addr
*bp
;
715 struct sctp_chunk
*chunk
;
716 union sctp_addr
*laddr
;
719 struct sctp_sockaddr_entry
*saddr
;
725 if (!net
->sctp
.addip_enable
)
731 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
732 __func__
, sk
, addrs
, addrcnt
);
734 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
736 if (!asoc
->peer
.asconf_capable
)
739 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
742 if (!sctp_state(asoc
, ESTABLISHED
))
745 /* Check if any address in the packed array of addresses is
746 * not present in the bind address list of the association.
747 * If so, do not send the asconf chunk to its peer, but
748 * continue with other associations.
751 for (i
= 0; i
< addrcnt
; i
++) {
753 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
759 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
762 addr_buf
+= af
->sockaddr_len
;
767 /* Find one address in the association's bind address list
768 * that is not in the packed array of addresses. This is to
769 * make sure that we do not delete all the addresses in the
772 bp
= &asoc
->base
.bind_addr
;
773 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
775 if ((laddr
== NULL
) && (addrcnt
== 1)) {
776 if (asoc
->asconf_addr_del_pending
)
778 asoc
->asconf_addr_del_pending
=
779 kzalloc(sizeof(union sctp_addr
), GFP_ATOMIC
);
780 if (asoc
->asconf_addr_del_pending
== NULL
) {
784 asoc
->asconf_addr_del_pending
->sa
.sa_family
=
786 asoc
->asconf_addr_del_pending
->v4
.sin_port
=
788 if (addrs
->sa_family
== AF_INET
) {
789 struct sockaddr_in
*sin
;
791 sin
= (struct sockaddr_in
*)addrs
;
792 asoc
->asconf_addr_del_pending
->v4
.sin_addr
.s_addr
= sin
->sin_addr
.s_addr
;
793 } else if (addrs
->sa_family
== AF_INET6
) {
794 struct sockaddr_in6
*sin6
;
796 sin6
= (struct sockaddr_in6
*)addrs
;
797 asoc
->asconf_addr_del_pending
->v6
.sin6_addr
= sin6
->sin6_addr
;
800 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
801 __func__
, asoc
, &asoc
->asconf_addr_del_pending
->sa
,
802 asoc
->asconf_addr_del_pending
);
804 asoc
->src_out_of_asoc_ok
= 1;
812 /* We do not need RCU protection throughout this loop
813 * because this is done under a socket lock from the
816 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
824 /* Reset use_as_src flag for the addresses in the bind address
825 * list that are to be deleted.
828 for (i
= 0; i
< addrcnt
; i
++) {
830 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
831 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
832 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
833 saddr
->state
= SCTP_ADDR_DEL
;
835 addr_buf
+= af
->sockaddr_len
;
838 /* Update the route and saddr entries for all the transports
839 * as some of the addresses in the bind address list are
840 * about to be deleted and cannot be used as source addresses.
842 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
844 dst_release(transport
->dst
);
845 sctp_transport_route(transport
, NULL
,
846 sctp_sk(asoc
->base
.sk
));
850 /* We don't need to transmit ASCONF */
852 retval
= sctp_send_asconf(asoc
, chunk
);
858 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
859 int sctp_asconf_mgmt(struct sctp_sock
*sp
, struct sctp_sockaddr_entry
*addrw
)
861 struct sock
*sk
= sctp_opt2sk(sp
);
862 union sctp_addr
*addr
;
865 /* It is safe to write port space in caller. */
867 addr
->v4
.sin_port
= htons(sp
->ep
->base
.bind_addr
.port
);
868 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
871 if (sctp_verify_addr(sk
, addr
, af
->sockaddr_len
))
874 if (addrw
->state
== SCTP_ADDR_NEW
)
875 return sctp_send_asconf_add_ip(sk
, (struct sockaddr
*)addr
, 1);
877 return sctp_send_asconf_del_ip(sk
, (struct sockaddr
*)addr
, 1);
880 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
883 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
886 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
887 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
890 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
891 * Section 3.1.2 for this usage.
893 * addrs is a pointer to an array of one or more socket addresses. Each
894 * address is contained in its appropriate structure (i.e. struct
895 * sockaddr_in or struct sockaddr_in6) the family of the address type
896 * must be used to distinguish the address length (note that this
897 * representation is termed a "packed array" of addresses). The caller
898 * specifies the number of addresses in the array with addrcnt.
900 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
901 * -1, and sets errno to the appropriate error code.
903 * For SCTP, the port given in each socket address must be the same, or
904 * sctp_bindx() will fail, setting errno to EINVAL.
906 * The flags parameter is formed from the bitwise OR of zero or more of
907 * the following currently defined flags:
909 * SCTP_BINDX_ADD_ADDR
911 * SCTP_BINDX_REM_ADDR
913 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
914 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
915 * addresses from the association. The two flags are mutually exclusive;
916 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
917 * not remove all addresses from an association; sctp_bindx() will
918 * reject such an attempt with EINVAL.
920 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
921 * additional addresses with an endpoint after calling bind(). Or use
922 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
923 * socket is associated with so that no new association accepted will be
924 * associated with those addresses. If the endpoint supports dynamic
925 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
926 * endpoint to send the appropriate message to the peer to change the
927 * peers address lists.
929 * Adding and removing addresses from a connected association is
930 * optional functionality. Implementations that do not support this
931 * functionality should return EOPNOTSUPP.
933 * Basically do nothing but copying the addresses from user to kernel
934 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
935 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
938 * We don't use copy_from_user() for optimization: we first do the
939 * sanity checks (buffer size -fast- and access check-healthy
940 * pointer); if all of those succeed, then we can alloc the memory
941 * (expensive operation) needed to copy the data to kernel. Then we do
942 * the copying without checking the user space area
943 * (__copy_from_user()).
945 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
948 * sk The sk of the socket
949 * addrs The pointer to the addresses in user land
950 * addrssize Size of the addrs buffer
951 * op Operation to perform (add or remove, see the flags of
954 * Returns 0 if ok, <0 errno code on error.
956 static int sctp_setsockopt_bindx(struct sock
* sk
,
957 struct sockaddr __user
*addrs
,
958 int addrs_size
, int op
)
960 struct sockaddr
*kaddrs
;
964 struct sockaddr
*sa_addr
;
968 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
969 __func__
, sk
, addrs
, addrs_size
, op
);
971 if (unlikely(addrs_size
<= 0))
974 /* Check the user passed a healthy pointer. */
975 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
978 /* Alloc space for the address array in kernel memory. */
979 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
980 if (unlikely(!kaddrs
))
983 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
988 /* Walk through the addrs buffer and count the number of addresses. */
990 while (walk_size
< addrs_size
) {
991 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
997 af
= sctp_get_af_specific(sa_addr
->sa_family
);
999 /* If the address family is not supported or if this address
1000 * causes the address buffer to overflow return EINVAL.
1002 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1007 addr_buf
+= af
->sockaddr_len
;
1008 walk_size
+= af
->sockaddr_len
;
1013 case SCTP_BINDX_ADD_ADDR
:
1014 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
1017 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
1020 case SCTP_BINDX_REM_ADDR
:
1021 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
1024 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
1038 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1040 * Common routine for handling connect() and sctp_connectx().
1041 * Connect will come in with just a single address.
1043 static int __sctp_connect(struct sock
* sk
,
1044 struct sockaddr
*kaddrs
,
1046 sctp_assoc_t
*assoc_id
)
1048 struct net
*net
= sock_net(sk
);
1049 struct sctp_sock
*sp
;
1050 struct sctp_endpoint
*ep
;
1051 struct sctp_association
*asoc
= NULL
;
1052 struct sctp_association
*asoc2
;
1053 struct sctp_transport
*transport
;
1061 union sctp_addr
*sa_addr
= NULL
;
1063 unsigned short port
;
1064 unsigned int f_flags
= 0;
1069 /* connect() cannot be done on a socket that is already in ESTABLISHED
1070 * state - UDP-style peeled off socket or a TCP-style socket that
1071 * is already connected.
1072 * It cannot be done even on a TCP-style listening socket.
1074 if (sctp_sstate(sk
, ESTABLISHED
) ||
1075 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
1080 /* Walk through the addrs buffer and count the number of addresses. */
1082 while (walk_size
< addrs_size
) {
1083 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1089 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1091 /* If the address family is not supported or if this address
1092 * causes the address buffer to overflow return EINVAL.
1094 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1099 port
= ntohs(sa_addr
->v4
.sin_port
);
1101 /* Save current address so we can work with it */
1102 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1104 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1108 /* Make sure the destination port is correctly set
1111 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
) {
1116 /* Check if there already is a matching association on the
1117 * endpoint (other than the one created here).
1119 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1120 if (asoc2
&& asoc2
!= asoc
) {
1121 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1128 /* If we could not find a matching association on the endpoint,
1129 * make sure that there is no peeled-off association matching
1130 * the peer address even on another socket.
1132 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1133 err
= -EADDRNOTAVAIL
;
1138 /* If a bind() or sctp_bindx() is not called prior to
1139 * an sctp_connectx() call, the system picks an
1140 * ephemeral port and will choose an address set
1141 * equivalent to binding with a wildcard address.
1143 if (!ep
->base
.bind_addr
.port
) {
1144 if (sctp_autobind(sk
)) {
1150 * If an unprivileged user inherits a 1-many
1151 * style socket with open associations on a
1152 * privileged port, it MAY be permitted to
1153 * accept new associations, but it SHOULD NOT
1154 * be permitted to open new associations.
1156 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1157 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
)) {
1163 scope
= sctp_scope(&to
);
1164 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1170 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
,
1178 /* Prime the peer's transport structures. */
1179 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1187 addr_buf
+= af
->sockaddr_len
;
1188 walk_size
+= af
->sockaddr_len
;
1191 /* In case the user of sctp_connectx() wants an association
1192 * id back, assign one now.
1195 err
= sctp_assoc_set_id(asoc
, GFP_KERNEL
);
1200 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1205 /* Initialize sk's dport and daddr for getpeername() */
1206 inet_sk(sk
)->inet_dport
= htons(asoc
->peer
.port
);
1207 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1208 af
->to_sk_daddr(sa_addr
, sk
);
1211 /* in-kernel sockets don't generally have a file allocated to them
1212 * if all they do is call sock_create_kern().
1214 if (sk
->sk_socket
->file
)
1215 f_flags
= sk
->sk_socket
->file
->f_flags
;
1217 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1219 err
= sctp_wait_for_connect(asoc
, &timeo
);
1220 if ((err
== 0 || err
== -EINPROGRESS
) && assoc_id
)
1221 *assoc_id
= asoc
->assoc_id
;
1223 /* Don't free association on exit. */
1227 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1228 __func__
, asoc
, kaddrs
, err
);
1231 /* sctp_primitive_ASSOCIATE may have added this association
1232 * To the hash table, try to unhash it, just in case, its a noop
1233 * if it wasn't hashed so we're safe
1235 sctp_unhash_established(asoc
);
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
)
1309 struct sockaddr
*kaddrs
;
1311 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1312 __func__
, sk
, addrs
, addrs_size
);
1314 if (unlikely(addrs_size
<= 0))
1317 /* Check the user passed a healthy pointer. */
1318 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1321 /* Alloc space for the address array in kernel memory. */
1322 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1323 if (unlikely(!kaddrs
))
1326 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1329 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, assoc_id
);
1338 * This is an older interface. It's kept for backward compatibility
1339 * to the option that doesn't provide association id.
1341 static int sctp_setsockopt_connectx_old(struct sock
* sk
,
1342 struct sockaddr __user
*addrs
,
1345 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1349 * New interface for the API. The since the API is done with a socket
1350 * option, to make it simple we feed back the association id is as a return
1351 * indication to the call. Error is always negative and association id is
1354 static int sctp_setsockopt_connectx(struct sock
* sk
,
1355 struct sockaddr __user
*addrs
,
1358 sctp_assoc_t assoc_id
= 0;
1361 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1370 * New (hopefully final) interface for the API.
1371 * We use the sctp_getaddrs_old structure so that use-space library
1372 * can avoid any unnecessary allocations. The only defferent part
1373 * is that we store the actual length of the address buffer into the
1374 * addrs_num structure member. That way we can re-use the existing
1377 static int sctp_getsockopt_connectx3(struct sock
* sk
, int len
,
1378 char __user
*optval
,
1381 struct sctp_getaddrs_old param
;
1382 sctp_assoc_t assoc_id
= 0;
1385 if (len
< sizeof(param
))
1388 if (copy_from_user(¶m
, optval
, sizeof(param
)))
1391 err
= __sctp_setsockopt_connectx(sk
,
1392 (struct sockaddr __user
*)param
.addrs
,
1393 param
.addr_num
, &assoc_id
);
1395 if (err
== 0 || err
== -EINPROGRESS
) {
1396 if (copy_to_user(optval
, &assoc_id
, sizeof(assoc_id
)))
1398 if (put_user(sizeof(assoc_id
), optlen
))
1405 /* API 3.1.4 close() - UDP Style Syntax
1406 * Applications use close() to perform graceful shutdown (as described in
1407 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1408 * by a UDP-style socket.
1412 * ret = close(int sd);
1414 * sd - the socket descriptor of the associations to be closed.
1416 * To gracefully shutdown a specific association represented by the
1417 * UDP-style socket, an application should use the sendmsg() call,
1418 * passing no user data, but including the appropriate flag in the
1419 * ancillary data (see Section xxxx).
1421 * If sd in the close() call is a branched-off socket representing only
1422 * one association, the shutdown is performed on that association only.
1424 * 4.1.6 close() - TCP Style Syntax
1426 * Applications use close() to gracefully close down an association.
1430 * int close(int sd);
1432 * sd - the socket descriptor of the association to be closed.
1434 * After an application calls close() on a socket descriptor, no further
1435 * socket operations will succeed on that descriptor.
1437 * API 7.1.4 SO_LINGER
1439 * An application using the TCP-style socket can use this option to
1440 * perform the SCTP ABORT primitive. The linger option structure is:
1443 * int l_onoff; // option on/off
1444 * int l_linger; // linger time
1447 * To enable the option, set l_onoff to 1. If the l_linger value is set
1448 * to 0, calling close() is the same as the ABORT primitive. If the
1449 * value is set to a negative value, the setsockopt() call will return
1450 * an error. If the value is set to a positive value linger_time, the
1451 * close() can be blocked for at most linger_time ms. If the graceful
1452 * shutdown phase does not finish during this period, close() will
1453 * return but the graceful shutdown phase continues in the system.
1455 static void sctp_close(struct sock
*sk
, long timeout
)
1457 struct net
*net
= sock_net(sk
);
1458 struct sctp_endpoint
*ep
;
1459 struct sctp_association
*asoc
;
1460 struct list_head
*pos
, *temp
;
1461 unsigned int data_was_unread
;
1463 pr_debug("%s: sk:%p, timeout:%ld\n", __func__
, sk
, timeout
);
1466 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1467 sk
->sk_state
= SCTP_SS_CLOSING
;
1469 ep
= sctp_sk(sk
)->ep
;
1471 /* Clean up any skbs sitting on the receive queue. */
1472 data_was_unread
= sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1473 data_was_unread
+= sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1475 /* Walk all associations on an endpoint. */
1476 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1477 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1479 if (sctp_style(sk
, TCP
)) {
1480 /* A closed association can still be in the list if
1481 * it belongs to a TCP-style listening socket that is
1482 * not yet accepted. If so, free it. If not, send an
1483 * ABORT or SHUTDOWN based on the linger options.
1485 if (sctp_state(asoc
, CLOSED
)) {
1486 sctp_unhash_established(asoc
);
1487 sctp_association_free(asoc
);
1492 if (data_was_unread
|| !skb_queue_empty(&asoc
->ulpq
.lobby
) ||
1493 !skb_queue_empty(&asoc
->ulpq
.reasm
) ||
1494 (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
)) {
1495 struct sctp_chunk
*chunk
;
1497 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1499 sctp_primitive_ABORT(net
, asoc
, chunk
);
1501 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1504 /* On a TCP-style socket, block for at most linger_time if set. */
1505 if (sctp_style(sk
, TCP
) && timeout
)
1506 sctp_wait_for_close(sk
, timeout
);
1508 /* This will run the backlog queue. */
1509 sctp_release_sock(sk
);
1511 /* Supposedly, no process has access to the socket, but
1512 * the net layers still may.
1514 sctp_local_bh_disable();
1515 sctp_bh_lock_sock(sk
);
1517 /* Hold the sock, since sk_common_release() will put sock_put()
1518 * and we have just a little more cleanup.
1521 sk_common_release(sk
);
1523 sctp_bh_unlock_sock(sk
);
1524 sctp_local_bh_enable();
1528 SCTP_DBG_OBJCNT_DEC(sock
);
1531 /* Handle EPIPE error. */
1532 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1535 err
= sock_error(sk
) ? : -EPIPE
;
1536 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1537 send_sig(SIGPIPE
, current
, 0);
1541 /* API 3.1.3 sendmsg() - UDP Style Syntax
1543 * An application uses sendmsg() and recvmsg() calls to transmit data to
1544 * and receive data from its peer.
1546 * ssize_t sendmsg(int socket, const struct msghdr *message,
1549 * socket - the socket descriptor of the endpoint.
1550 * message - pointer to the msghdr structure which contains a single
1551 * user message and possibly some ancillary data.
1553 * See Section 5 for complete description of the data
1556 * flags - flags sent or received with the user message, see Section
1557 * 5 for complete description of the flags.
1559 * Note: This function could use a rewrite especially when explicit
1560 * connect support comes in.
1562 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1564 static int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1566 static int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1567 struct msghdr
*msg
, size_t msg_len
)
1569 struct net
*net
= sock_net(sk
);
1570 struct sctp_sock
*sp
;
1571 struct sctp_endpoint
*ep
;
1572 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1573 struct sctp_transport
*transport
, *chunk_tp
;
1574 struct sctp_chunk
*chunk
;
1576 struct sockaddr
*msg_name
= NULL
;
1577 struct sctp_sndrcvinfo default_sinfo
;
1578 struct sctp_sndrcvinfo
*sinfo
;
1579 struct sctp_initmsg
*sinit
;
1580 sctp_assoc_t associd
= 0;
1581 sctp_cmsgs_t cmsgs
= { NULL
};
1585 __u16 sinfo_flags
= 0;
1586 struct sctp_datamsg
*datamsg
;
1587 int msg_flags
= msg
->msg_flags
;
1593 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__
, sk
,
1596 /* We cannot send a message over a TCP-style listening socket. */
1597 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1602 /* Parse out the SCTP CMSGs. */
1603 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1605 pr_debug("%s: msghdr parse err:%x\n", __func__
, err
);
1609 /* Fetch the destination address for this packet. This
1610 * address only selects the association--it is not necessarily
1611 * the address we will send to.
1612 * For a peeled-off socket, msg_name is ignored.
1614 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1615 int msg_namelen
= msg
->msg_namelen
;
1617 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1622 if (msg_namelen
> sizeof(to
))
1623 msg_namelen
= sizeof(to
);
1624 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1625 msg_name
= msg
->msg_name
;
1631 /* Did the user specify SNDRCVINFO? */
1633 sinfo_flags
= sinfo
->sinfo_flags
;
1634 associd
= sinfo
->sinfo_assoc_id
;
1637 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__
,
1638 msg_len
, sinfo_flags
);
1640 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1641 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1646 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1647 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1648 * If SCTP_ABORT is set, the message length could be non zero with
1649 * the msg_iov set to the user abort reason.
1651 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1652 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1657 /* If SCTP_ADDR_OVER is set, there must be an address
1658 * specified in msg_name.
1660 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1667 pr_debug("%s: about to look up association\n", __func__
);
1671 /* If a msg_name has been specified, assume this is to be used. */
1673 /* Look for a matching association on the endpoint. */
1674 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1676 /* If we could not find a matching association on the
1677 * endpoint, make sure that it is not a TCP-style
1678 * socket that already has an association or there is
1679 * no peeled-off association on another socket.
1681 if ((sctp_style(sk
, TCP
) &&
1682 sctp_sstate(sk
, ESTABLISHED
)) ||
1683 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1684 err
= -EADDRNOTAVAIL
;
1689 asoc
= sctp_id2assoc(sk
, associd
);
1697 pr_debug("%s: just looked up association:%p\n", __func__
, asoc
);
1699 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1700 * socket that has an association in CLOSED state. This can
1701 * happen when an accepted socket has an association that is
1704 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1709 if (sinfo_flags
& SCTP_EOF
) {
1710 pr_debug("%s: shutting down association:%p\n",
1713 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1717 if (sinfo_flags
& SCTP_ABORT
) {
1719 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1725 pr_debug("%s: aborting association:%p\n",
1728 sctp_primitive_ABORT(net
, asoc
, chunk
);
1734 /* Do we need to create the association? */
1736 pr_debug("%s: there is no association yet\n", __func__
);
1738 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1743 /* Check for invalid stream against the stream counts,
1744 * either the default or the user specified stream counts.
1747 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1748 /* Check against the defaults. */
1749 if (sinfo
->sinfo_stream
>=
1750 sp
->initmsg
.sinit_num_ostreams
) {
1755 /* Check against the requested. */
1756 if (sinfo
->sinfo_stream
>=
1757 sinit
->sinit_num_ostreams
) {
1765 * API 3.1.2 bind() - UDP Style Syntax
1766 * If a bind() or sctp_bindx() is not called prior to a
1767 * sendmsg() call that initiates a new association, the
1768 * system picks an ephemeral port and will choose an address
1769 * set equivalent to binding with a wildcard address.
1771 if (!ep
->base
.bind_addr
.port
) {
1772 if (sctp_autobind(sk
)) {
1778 * If an unprivileged user inherits a one-to-many
1779 * style socket with open associations on a privileged
1780 * port, it MAY be permitted to accept new associations,
1781 * but it SHOULD NOT be permitted to open new
1784 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1785 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
)) {
1791 scope
= sctp_scope(&to
);
1792 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1798 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
, GFP_KERNEL
);
1804 /* If the SCTP_INIT ancillary data is specified, set all
1805 * the association init values accordingly.
1808 if (sinit
->sinit_num_ostreams
) {
1809 asoc
->c
.sinit_num_ostreams
=
1810 sinit
->sinit_num_ostreams
;
1812 if (sinit
->sinit_max_instreams
) {
1813 asoc
->c
.sinit_max_instreams
=
1814 sinit
->sinit_max_instreams
;
1816 if (sinit
->sinit_max_attempts
) {
1817 asoc
->max_init_attempts
1818 = sinit
->sinit_max_attempts
;
1820 if (sinit
->sinit_max_init_timeo
) {
1821 asoc
->max_init_timeo
=
1822 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1826 /* Prime the peer's transport structures. */
1827 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1834 /* ASSERT: we have a valid association at this point. */
1835 pr_debug("%s: we have a valid association\n", __func__
);
1838 /* If the user didn't specify SNDRCVINFO, make up one with
1841 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1842 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1843 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1844 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1845 default_sinfo
.sinfo_context
= asoc
->default_context
;
1846 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1847 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1848 sinfo
= &default_sinfo
;
1851 /* API 7.1.7, the sndbuf size per association bounds the
1852 * maximum size of data that can be sent in a single send call.
1854 if (msg_len
> sk
->sk_sndbuf
) {
1859 if (asoc
->pmtu_pending
)
1860 sctp_assoc_pending_pmtu(sk
, asoc
);
1862 /* If fragmentation is disabled and the message length exceeds the
1863 * association fragmentation point, return EMSGSIZE. The I-D
1864 * does not specify what this error is, but this looks like
1867 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1872 /* Check for invalid stream. */
1873 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1878 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1879 if (!sctp_wspace(asoc
)) {
1880 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1885 /* If an address is passed with the sendto/sendmsg call, it is used
1886 * to override the primary destination address in the TCP model, or
1887 * when SCTP_ADDR_OVER flag is set in the UDP model.
1889 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1890 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1891 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1899 /* Auto-connect, if we aren't connected already. */
1900 if (sctp_state(asoc
, CLOSED
)) {
1901 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1905 pr_debug("%s: we associated primitively\n", __func__
);
1908 /* Break the message into multiple chunks of maximum size. */
1909 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1910 if (IS_ERR(datamsg
)) {
1911 err
= PTR_ERR(datamsg
);
1915 /* Now send the (possibly) fragmented message. */
1916 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1917 sctp_chunk_hold(chunk
);
1919 /* Do accounting for the write space. */
1920 sctp_set_owner_w(chunk
);
1922 chunk
->transport
= chunk_tp
;
1925 /* Send it to the lower layers. Note: all chunks
1926 * must either fail or succeed. The lower layer
1927 * works that way today. Keep it that way or this
1930 err
= sctp_primitive_SEND(net
, asoc
, datamsg
);
1931 /* Did the lower layer accept the chunk? */
1933 sctp_datamsg_free(datamsg
);
1937 pr_debug("%s: we sent primitively\n", __func__
);
1939 sctp_datamsg_put(datamsg
);
1942 /* If we are already past ASSOCIATE, the lower
1943 * layers are responsible for association cleanup.
1949 sctp_unhash_established(asoc
);
1950 sctp_association_free(asoc
);
1953 sctp_release_sock(sk
);
1956 return sctp_error(sk
, msg_flags
, err
);
1963 err
= sock_error(sk
);
1973 /* This is an extended version of skb_pull() that removes the data from the
1974 * start of a skb even when data is spread across the list of skb's in the
1975 * frag_list. len specifies the total amount of data that needs to be removed.
1976 * when 'len' bytes could be removed from the skb, it returns 0.
1977 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1978 * could not be removed.
1980 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1982 struct sk_buff
*list
;
1983 int skb_len
= skb_headlen(skb
);
1986 if (len
<= skb_len
) {
1987 __skb_pull(skb
, len
);
1991 __skb_pull(skb
, skb_len
);
1993 skb_walk_frags(skb
, list
) {
1994 rlen
= sctp_skb_pull(list
, len
);
1995 skb
->len
-= (len
-rlen
);
1996 skb
->data_len
-= (len
-rlen
);
2007 /* API 3.1.3 recvmsg() - UDP Style Syntax
2009 * ssize_t recvmsg(int socket, struct msghdr *message,
2012 * socket - the socket descriptor of the endpoint.
2013 * message - pointer to the msghdr structure which contains a single
2014 * user message and possibly some ancillary data.
2016 * See Section 5 for complete description of the data
2019 * flags - flags sent or received with the user message, see Section
2020 * 5 for complete description of the flags.
2022 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
2024 static int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
2025 struct msghdr
*msg
, size_t len
, int noblock
,
2026 int flags
, int *addr_len
)
2028 struct sctp_ulpevent
*event
= NULL
;
2029 struct sctp_sock
*sp
= sctp_sk(sk
);
2030 struct sk_buff
*skb
;
2035 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2036 "addr_len:%p)\n", __func__
, sk
, msg
, len
, noblock
, flags
,
2041 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
2046 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
2050 /* Get the total length of the skb including any skb's in the
2059 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
2061 event
= sctp_skb2event(skb
);
2066 sock_recv_ts_and_drops(msg
, sk
, skb
);
2067 if (sctp_ulpevent_is_notification(event
)) {
2068 msg
->msg_flags
|= MSG_NOTIFICATION
;
2069 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
2071 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
2074 /* Check if we allow SCTP_SNDRCVINFO. */
2075 if (sp
->subscribe
.sctp_data_io_event
)
2076 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
2078 /* FIXME: we should be calling IP/IPv6 layers. */
2079 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
2080 ip_cmsg_recv(msg
, skb
);
2085 /* If skb's length exceeds the user's buffer, update the skb and
2086 * push it back to the receive_queue so that the next call to
2087 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2089 if (skb_len
> copied
) {
2090 msg
->msg_flags
&= ~MSG_EOR
;
2091 if (flags
& MSG_PEEK
)
2093 sctp_skb_pull(skb
, copied
);
2094 skb_queue_head(&sk
->sk_receive_queue
, skb
);
2096 /* When only partial message is copied to the user, increase
2097 * rwnd by that amount. If all the data in the skb is read,
2098 * rwnd is updated when the event is freed.
2100 if (!sctp_ulpevent_is_notification(event
))
2101 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
2103 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
2104 (event
->msg_flags
& MSG_EOR
))
2105 msg
->msg_flags
|= MSG_EOR
;
2107 msg
->msg_flags
&= ~MSG_EOR
;
2110 if (flags
& MSG_PEEK
) {
2111 /* Release the skb reference acquired after peeking the skb in
2112 * sctp_skb_recv_datagram().
2116 /* Free the event which includes releasing the reference to
2117 * the owner of the skb, freeing the skb and updating the
2120 sctp_ulpevent_free(event
);
2123 sctp_release_sock(sk
);
2127 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2129 * This option is a on/off flag. If enabled no SCTP message
2130 * fragmentation will be performed. Instead if a message being sent
2131 * exceeds the current PMTU size, the message will NOT be sent and
2132 * instead a error will be indicated to the user.
2134 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
2135 char __user
*optval
,
2136 unsigned int optlen
)
2140 if (optlen
< sizeof(int))
2143 if (get_user(val
, (int __user
*)optval
))
2146 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
2151 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2152 unsigned int optlen
)
2154 struct sctp_association
*asoc
;
2155 struct sctp_ulpevent
*event
;
2157 if (optlen
> sizeof(struct sctp_event_subscribe
))
2159 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2163 * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2164 * if there is no data to be sent or retransmit, the stack will
2165 * immediately send up this notification.
2167 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT
,
2168 &sctp_sk(sk
)->subscribe
)) {
2169 asoc
= sctp_id2assoc(sk
, 0);
2171 if (asoc
&& sctp_outq_is_empty(&asoc
->outqueue
)) {
2172 event
= sctp_ulpevent_make_sender_dry_event(asoc
,
2177 sctp_ulpq_tail_event(&asoc
->ulpq
, event
);
2184 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2186 * This socket option is applicable to the UDP-style socket only. When
2187 * set it will cause associations that are idle for more than the
2188 * specified number of seconds to automatically close. An association
2189 * being idle is defined an association that has NOT sent or received
2190 * user data. The special value of '0' indicates that no automatic
2191 * close of any associations should be performed. The option expects an
2192 * integer defining the number of seconds of idle time before an
2193 * association is closed.
2195 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2196 unsigned int optlen
)
2198 struct sctp_sock
*sp
= sctp_sk(sk
);
2199 struct net
*net
= sock_net(sk
);
2201 /* Applicable to UDP-style socket only */
2202 if (sctp_style(sk
, TCP
))
2204 if (optlen
!= sizeof(int))
2206 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2209 if (sp
->autoclose
> net
->sctp
.max_autoclose
)
2210 sp
->autoclose
= net
->sctp
.max_autoclose
;
2215 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2217 * Applications can enable or disable heartbeats for any peer address of
2218 * an association, modify an address's heartbeat interval, force a
2219 * heartbeat to be sent immediately, and adjust the address's maximum
2220 * number of retransmissions sent before an address is considered
2221 * unreachable. The following structure is used to access and modify an
2222 * address's parameters:
2224 * struct sctp_paddrparams {
2225 * sctp_assoc_t spp_assoc_id;
2226 * struct sockaddr_storage spp_address;
2227 * uint32_t spp_hbinterval;
2228 * uint16_t spp_pathmaxrxt;
2229 * uint32_t spp_pathmtu;
2230 * uint32_t spp_sackdelay;
2231 * uint32_t spp_flags;
2234 * spp_assoc_id - (one-to-many style socket) This is filled in the
2235 * application, and identifies the association for
2237 * spp_address - This specifies which address is of interest.
2238 * spp_hbinterval - This contains the value of the heartbeat interval,
2239 * in milliseconds. If a value of zero
2240 * is present in this field then no changes are to
2241 * be made to this parameter.
2242 * spp_pathmaxrxt - This contains the maximum number of
2243 * retransmissions before this address shall be
2244 * considered unreachable. If a value of zero
2245 * is present in this field then no changes are to
2246 * be made to this parameter.
2247 * spp_pathmtu - When Path MTU discovery is disabled the value
2248 * specified here will be the "fixed" path mtu.
2249 * Note that if the spp_address field is empty
2250 * then all associations on this address will
2251 * have this fixed path mtu set upon them.
2253 * spp_sackdelay - When delayed sack is enabled, this value specifies
2254 * the number of milliseconds that sacks will be delayed
2255 * for. This value will apply to all addresses of an
2256 * association if the spp_address field is empty. Note
2257 * also, that if delayed sack is enabled and this
2258 * value is set to 0, no change is made to the last
2259 * recorded delayed sack timer value.
2261 * spp_flags - These flags are used to control various features
2262 * on an association. The flag field may contain
2263 * zero or more of the following options.
2265 * SPP_HB_ENABLE - Enable heartbeats on the
2266 * specified address. Note that if the address
2267 * field is empty all addresses for the association
2268 * have heartbeats enabled upon them.
2270 * SPP_HB_DISABLE - Disable heartbeats on the
2271 * speicifed address. Note that if the address
2272 * field is empty all addresses for the association
2273 * will have their heartbeats disabled. Note also
2274 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2275 * mutually exclusive, only one of these two should
2276 * be specified. Enabling both fields will have
2277 * undetermined results.
2279 * SPP_HB_DEMAND - Request a user initiated heartbeat
2280 * to be made immediately.
2282 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2283 * heartbeat delayis to be set to the value of 0
2286 * SPP_PMTUD_ENABLE - This field will enable PMTU
2287 * discovery upon the specified address. Note that
2288 * if the address feild is empty then all addresses
2289 * on the association are effected.
2291 * SPP_PMTUD_DISABLE - This field will disable PMTU
2292 * discovery upon the specified address. Note that
2293 * if the address feild is empty then all addresses
2294 * on the association are effected. Not also that
2295 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2296 * exclusive. Enabling both will have undetermined
2299 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2300 * on delayed sack. The time specified in spp_sackdelay
2301 * is used to specify the sack delay for this address. Note
2302 * that if spp_address is empty then all addresses will
2303 * enable delayed sack and take on the sack delay
2304 * value specified in spp_sackdelay.
2305 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2306 * off delayed sack. If the spp_address field is blank then
2307 * delayed sack is disabled for the entire association. Note
2308 * also that this field is mutually exclusive to
2309 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2312 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2313 struct sctp_transport
*trans
,
2314 struct sctp_association
*asoc
,
2315 struct sctp_sock
*sp
,
2318 int sackdelay_change
)
2322 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2323 struct net
*net
= sock_net(trans
->asoc
->base
.sk
);
2325 error
= sctp_primitive_REQUESTHEARTBEAT(net
, trans
->asoc
, trans
);
2330 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2331 * this field is ignored. Note also that a value of zero indicates
2332 * the current setting should be left unchanged.
2334 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2336 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2337 * set. This lets us use 0 value when this flag
2340 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2341 params
->spp_hbinterval
= 0;
2343 if (params
->spp_hbinterval
||
2344 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2347 msecs_to_jiffies(params
->spp_hbinterval
);
2350 msecs_to_jiffies(params
->spp_hbinterval
);
2352 sp
->hbinterval
= params
->spp_hbinterval
;
2359 trans
->param_flags
=
2360 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2363 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2366 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2370 /* When Path MTU discovery is disabled the value specified here will
2371 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2372 * include the flag SPP_PMTUD_DISABLE for this field to have any
2375 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2377 trans
->pathmtu
= params
->spp_pathmtu
;
2378 sctp_assoc_sync_pmtu(sctp_opt2sk(sp
), asoc
);
2380 asoc
->pathmtu
= params
->spp_pathmtu
;
2381 sctp_frag_point(asoc
, params
->spp_pathmtu
);
2383 sp
->pathmtu
= params
->spp_pathmtu
;
2389 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2390 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2391 trans
->param_flags
=
2392 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2394 sctp_transport_pmtu(trans
, sctp_opt2sk(sp
));
2395 sctp_assoc_sync_pmtu(sctp_opt2sk(sp
), asoc
);
2399 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2402 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2406 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2407 * value of this field is ignored. Note also that a value of zero
2408 * indicates the current setting should be left unchanged.
2410 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2413 msecs_to_jiffies(params
->spp_sackdelay
);
2416 msecs_to_jiffies(params
->spp_sackdelay
);
2418 sp
->sackdelay
= params
->spp_sackdelay
;
2422 if (sackdelay_change
) {
2424 trans
->param_flags
=
2425 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2429 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2433 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2438 /* Note that a value of zero indicates the current setting should be
2441 if (params
->spp_pathmaxrxt
) {
2443 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2445 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2447 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2454 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2455 char __user
*optval
,
2456 unsigned int optlen
)
2458 struct sctp_paddrparams params
;
2459 struct sctp_transport
*trans
= NULL
;
2460 struct sctp_association
*asoc
= NULL
;
2461 struct sctp_sock
*sp
= sctp_sk(sk
);
2463 int hb_change
, pmtud_change
, sackdelay_change
;
2465 if (optlen
!= sizeof(struct sctp_paddrparams
))
2468 if (copy_from_user(¶ms
, optval
, optlen
))
2471 /* Validate flags and value parameters. */
2472 hb_change
= params
.spp_flags
& SPP_HB
;
2473 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2474 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2476 if (hb_change
== SPP_HB
||
2477 pmtud_change
== SPP_PMTUD
||
2478 sackdelay_change
== SPP_SACKDELAY
||
2479 params
.spp_sackdelay
> 500 ||
2480 (params
.spp_pathmtu
&&
2481 params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2484 /* If an address other than INADDR_ANY is specified, and
2485 * no transport is found, then the request is invalid.
2487 if (!sctp_is_any(sk
, ( union sctp_addr
*)¶ms
.spp_address
)) {
2488 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2489 params
.spp_assoc_id
);
2494 /* Get association, if assoc_id != 0 and the socket is a one
2495 * to many style socket, and an association was not found, then
2496 * the id was invalid.
2498 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2499 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2502 /* Heartbeat demand can only be sent on a transport or
2503 * association, but not a socket.
2505 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2508 /* Process parameters. */
2509 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2510 hb_change
, pmtud_change
,
2516 /* If changes are for association, also apply parameters to each
2519 if (!trans
&& asoc
) {
2520 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2522 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2523 hb_change
, pmtud_change
,
2532 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2534 * This option will effect the way delayed acks are performed. This
2535 * option allows you to get or set the delayed ack time, in
2536 * milliseconds. It also allows changing the delayed ack frequency.
2537 * Changing the frequency to 1 disables the delayed sack algorithm. If
2538 * the assoc_id is 0, then this sets or gets the endpoints default
2539 * values. If the assoc_id field is non-zero, then the set or get
2540 * effects the specified association for the one to many model (the
2541 * assoc_id field is ignored by the one to one model). Note that if
2542 * sack_delay or sack_freq are 0 when setting this option, then the
2543 * current values will remain unchanged.
2545 * struct sctp_sack_info {
2546 * sctp_assoc_t sack_assoc_id;
2547 * uint32_t sack_delay;
2548 * uint32_t sack_freq;
2551 * sack_assoc_id - This parameter, indicates which association the user
2552 * is performing an action upon. Note that if this field's value is
2553 * zero then the endpoints default value is changed (effecting future
2554 * associations only).
2556 * sack_delay - This parameter contains the number of milliseconds that
2557 * the user is requesting the delayed ACK timer be set to. Note that
2558 * this value is defined in the standard to be between 200 and 500
2561 * sack_freq - This parameter contains the number of packets that must
2562 * be received before a sack is sent without waiting for the delay
2563 * timer to expire. The default value for this is 2, setting this
2564 * value to 1 will disable the delayed sack algorithm.
2567 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2568 char __user
*optval
, unsigned int optlen
)
2570 struct sctp_sack_info params
;
2571 struct sctp_transport
*trans
= NULL
;
2572 struct sctp_association
*asoc
= NULL
;
2573 struct sctp_sock
*sp
= sctp_sk(sk
);
2575 if (optlen
== sizeof(struct sctp_sack_info
)) {
2576 if (copy_from_user(¶ms
, optval
, optlen
))
2579 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2581 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2582 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2583 pr_warn("Use struct sctp_sack_info instead\n");
2584 if (copy_from_user(¶ms
, optval
, optlen
))
2587 if (params
.sack_delay
== 0)
2588 params
.sack_freq
= 1;
2590 params
.sack_freq
= 0;
2594 /* Validate value parameter. */
2595 if (params
.sack_delay
> 500)
2598 /* Get association, if sack_assoc_id != 0 and the socket is a one
2599 * to many style socket, and an association was not found, then
2600 * the id was invalid.
2602 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2603 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2606 if (params
.sack_delay
) {
2609 msecs_to_jiffies(params
.sack_delay
);
2611 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2612 SPP_SACKDELAY_ENABLE
;
2614 sp
->sackdelay
= params
.sack_delay
;
2616 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2617 SPP_SACKDELAY_ENABLE
;
2621 if (params
.sack_freq
== 1) {
2624 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2625 SPP_SACKDELAY_DISABLE
;
2628 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2629 SPP_SACKDELAY_DISABLE
;
2631 } else if (params
.sack_freq
> 1) {
2633 asoc
->sackfreq
= params
.sack_freq
;
2635 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2636 SPP_SACKDELAY_ENABLE
;
2638 sp
->sackfreq
= params
.sack_freq
;
2640 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2641 SPP_SACKDELAY_ENABLE
;
2645 /* If change is for association, also apply to each transport. */
2647 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2649 if (params
.sack_delay
) {
2651 msecs_to_jiffies(params
.sack_delay
);
2652 trans
->param_flags
=
2653 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2654 SPP_SACKDELAY_ENABLE
;
2656 if (params
.sack_freq
== 1) {
2657 trans
->param_flags
=
2658 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2659 SPP_SACKDELAY_DISABLE
;
2660 } else if (params
.sack_freq
> 1) {
2661 trans
->sackfreq
= params
.sack_freq
;
2662 trans
->param_flags
=
2663 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2664 SPP_SACKDELAY_ENABLE
;
2672 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2674 * Applications can specify protocol parameters for the default association
2675 * initialization. The option name argument to setsockopt() and getsockopt()
2678 * Setting initialization parameters is effective only on an unconnected
2679 * socket (for UDP-style sockets only future associations are effected
2680 * by the change). With TCP-style sockets, this option is inherited by
2681 * sockets derived from a listener socket.
2683 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2685 struct sctp_initmsg sinit
;
2686 struct sctp_sock
*sp
= sctp_sk(sk
);
2688 if (optlen
!= sizeof(struct sctp_initmsg
))
2690 if (copy_from_user(&sinit
, optval
, optlen
))
2693 if (sinit
.sinit_num_ostreams
)
2694 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2695 if (sinit
.sinit_max_instreams
)
2696 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2697 if (sinit
.sinit_max_attempts
)
2698 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2699 if (sinit
.sinit_max_init_timeo
)
2700 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2706 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2708 * Applications that wish to use the sendto() system call may wish to
2709 * specify a default set of parameters that would normally be supplied
2710 * through the inclusion of ancillary data. This socket option allows
2711 * such an application to set the default sctp_sndrcvinfo structure.
2712 * The application that wishes to use this socket option simply passes
2713 * in to this call the sctp_sndrcvinfo structure defined in Section
2714 * 5.2.2) The input parameters accepted by this call include
2715 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2716 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2717 * to this call if the caller is using the UDP model.
2719 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2720 char __user
*optval
,
2721 unsigned int optlen
)
2723 struct sctp_sndrcvinfo info
;
2724 struct sctp_association
*asoc
;
2725 struct sctp_sock
*sp
= sctp_sk(sk
);
2727 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2729 if (copy_from_user(&info
, optval
, optlen
))
2732 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2733 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2737 asoc
->default_stream
= info
.sinfo_stream
;
2738 asoc
->default_flags
= info
.sinfo_flags
;
2739 asoc
->default_ppid
= info
.sinfo_ppid
;
2740 asoc
->default_context
= info
.sinfo_context
;
2741 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2743 sp
->default_stream
= info
.sinfo_stream
;
2744 sp
->default_flags
= info
.sinfo_flags
;
2745 sp
->default_ppid
= info
.sinfo_ppid
;
2746 sp
->default_context
= info
.sinfo_context
;
2747 sp
->default_timetolive
= info
.sinfo_timetolive
;
2753 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2755 * Requests that the local SCTP stack use the enclosed peer address as
2756 * the association primary. The enclosed address must be one of the
2757 * association peer's addresses.
2759 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2760 unsigned int optlen
)
2762 struct sctp_prim prim
;
2763 struct sctp_transport
*trans
;
2765 if (optlen
!= sizeof(struct sctp_prim
))
2768 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2771 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2775 sctp_assoc_set_primary(trans
->asoc
, trans
);
2781 * 7.1.5 SCTP_NODELAY
2783 * Turn on/off any Nagle-like algorithm. This means that packets are
2784 * generally sent as soon as possible and no unnecessary delays are
2785 * introduced, at the cost of more packets in the network. Expects an
2786 * integer boolean flag.
2788 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2789 unsigned int optlen
)
2793 if (optlen
< sizeof(int))
2795 if (get_user(val
, (int __user
*)optval
))
2798 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2804 * 7.1.1 SCTP_RTOINFO
2806 * The protocol parameters used to initialize and bound retransmission
2807 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2808 * and modify these parameters.
2809 * All parameters are time values, in milliseconds. A value of 0, when
2810 * modifying the parameters, indicates that the current value should not
2814 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2816 struct sctp_rtoinfo rtoinfo
;
2817 struct sctp_association
*asoc
;
2818 unsigned long rto_min
, rto_max
;
2819 struct sctp_sock
*sp
= sctp_sk(sk
);
2821 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2824 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2827 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2829 /* Set the values to the specific association */
2830 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2833 rto_max
= rtoinfo
.srto_max
;
2834 rto_min
= rtoinfo
.srto_min
;
2837 rto_max
= asoc
? msecs_to_jiffies(rto_max
) : rto_max
;
2839 rto_max
= asoc
? asoc
->rto_max
: sp
->rtoinfo
.srto_max
;
2842 rto_min
= asoc
? msecs_to_jiffies(rto_min
) : rto_min
;
2844 rto_min
= asoc
? asoc
->rto_min
: sp
->rtoinfo
.srto_min
;
2846 if (rto_min
> rto_max
)
2850 if (rtoinfo
.srto_initial
!= 0)
2852 msecs_to_jiffies(rtoinfo
.srto_initial
);
2853 asoc
->rto_max
= rto_max
;
2854 asoc
->rto_min
= rto_min
;
2856 /* If there is no association or the association-id = 0
2857 * set the values to the endpoint.
2859 if (rtoinfo
.srto_initial
!= 0)
2860 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2861 sp
->rtoinfo
.srto_max
= rto_max
;
2862 sp
->rtoinfo
.srto_min
= rto_min
;
2870 * 7.1.2 SCTP_ASSOCINFO
2872 * This option is used to tune the maximum retransmission attempts
2873 * of the association.
2874 * Returns an error if the new association retransmission value is
2875 * greater than the sum of the retransmission value of the peer.
2876 * See [SCTP] for more information.
2879 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2882 struct sctp_assocparams assocparams
;
2883 struct sctp_association
*asoc
;
2885 if (optlen
!= sizeof(struct sctp_assocparams
))
2887 if (copy_from_user(&assocparams
, optval
, optlen
))
2890 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2892 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2895 /* Set the values to the specific association */
2897 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2900 struct sctp_transport
*peer_addr
;
2902 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
2904 path_sum
+= peer_addr
->pathmaxrxt
;
2908 /* Only validate asocmaxrxt if we have more than
2909 * one path/transport. We do this because path
2910 * retransmissions are only counted when we have more
2914 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2917 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2920 if (assocparams
.sasoc_cookie_life
!= 0)
2921 asoc
->cookie_life
= ms_to_ktime(assocparams
.sasoc_cookie_life
);
2923 /* Set the values to the endpoint */
2924 struct sctp_sock
*sp
= sctp_sk(sk
);
2926 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2927 sp
->assocparams
.sasoc_asocmaxrxt
=
2928 assocparams
.sasoc_asocmaxrxt
;
2929 if (assocparams
.sasoc_cookie_life
!= 0)
2930 sp
->assocparams
.sasoc_cookie_life
=
2931 assocparams
.sasoc_cookie_life
;
2937 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2939 * This socket option is a boolean flag which turns on or off mapped V4
2940 * addresses. If this option is turned on and the socket is type
2941 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2942 * If this option is turned off, then no mapping will be done of V4
2943 * addresses and a user will receive both PF_INET6 and PF_INET type
2944 * addresses on the socket.
2946 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2949 struct sctp_sock
*sp
= sctp_sk(sk
);
2951 if (optlen
< sizeof(int))
2953 if (get_user(val
, (int __user
*)optval
))
2964 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2965 * This option will get or set the maximum size to put in any outgoing
2966 * SCTP DATA chunk. If a message is larger than this size it will be
2967 * fragmented by SCTP into the specified size. Note that the underlying
2968 * SCTP implementation may fragment into smaller sized chunks when the
2969 * PMTU of the underlying association is smaller than the value set by
2970 * the user. The default value for this option is '0' which indicates
2971 * the user is NOT limiting fragmentation and only the PMTU will effect
2972 * SCTP's choice of DATA chunk size. Note also that values set larger
2973 * than the maximum size of an IP datagram will effectively let SCTP
2974 * control fragmentation (i.e. the same as setting this option to 0).
2976 * The following structure is used to access and modify this parameter:
2978 * struct sctp_assoc_value {
2979 * sctp_assoc_t assoc_id;
2980 * uint32_t assoc_value;
2983 * assoc_id: This parameter is ignored for one-to-one style sockets.
2984 * For one-to-many style sockets this parameter indicates which
2985 * association the user is performing an action upon. Note that if
2986 * this field's value is zero then the endpoints default value is
2987 * changed (effecting future associations only).
2988 * assoc_value: This parameter specifies the maximum size in bytes.
2990 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2992 struct sctp_assoc_value params
;
2993 struct sctp_association
*asoc
;
2994 struct sctp_sock
*sp
= sctp_sk(sk
);
2997 if (optlen
== sizeof(int)) {
2998 pr_warn("Use of int in maxseg socket option deprecated\n");
2999 pr_warn("Use struct sctp_assoc_value instead\n");
3000 if (copy_from_user(&val
, optval
, optlen
))
3002 params
.assoc_id
= 0;
3003 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3004 if (copy_from_user(¶ms
, optval
, optlen
))
3006 val
= params
.assoc_value
;
3010 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
3013 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3014 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
3019 val
= asoc
->pathmtu
;
3020 val
-= sp
->pf
->af
->net_header_len
;
3021 val
-= sizeof(struct sctphdr
) +
3022 sizeof(struct sctp_data_chunk
);
3024 asoc
->user_frag
= val
;
3025 asoc
->frag_point
= sctp_frag_point(asoc
, asoc
->pathmtu
);
3027 sp
->user_frag
= val
;
3035 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3037 * Requests that the peer mark the enclosed address as the association
3038 * primary. The enclosed address must be one of the association's
3039 * locally bound addresses. The following structure is used to make a
3040 * set primary request:
3042 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
3043 unsigned int optlen
)
3045 struct net
*net
= sock_net(sk
);
3046 struct sctp_sock
*sp
;
3047 struct sctp_association
*asoc
= NULL
;
3048 struct sctp_setpeerprim prim
;
3049 struct sctp_chunk
*chunk
;
3055 if (!net
->sctp
.addip_enable
)
3058 if (optlen
!= sizeof(struct sctp_setpeerprim
))
3061 if (copy_from_user(&prim
, optval
, optlen
))
3064 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
3068 if (!asoc
->peer
.asconf_capable
)
3071 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
3074 if (!sctp_state(asoc
, ESTABLISHED
))
3077 af
= sctp_get_af_specific(prim
.sspp_addr
.ss_family
);
3081 if (!af
->addr_valid((union sctp_addr
*)&prim
.sspp_addr
, sp
, NULL
))
3082 return -EADDRNOTAVAIL
;
3084 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
3085 return -EADDRNOTAVAIL
;
3087 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3088 chunk
= sctp_make_asconf_set_prim(asoc
,
3089 (union sctp_addr
*)&prim
.sspp_addr
);
3093 err
= sctp_send_asconf(asoc
, chunk
);
3095 pr_debug("%s: we set peer primary addr primitively\n", __func__
);
3100 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
3101 unsigned int optlen
)
3103 struct sctp_setadaptation adaptation
;
3105 if (optlen
!= sizeof(struct sctp_setadaptation
))
3107 if (copy_from_user(&adaptation
, optval
, optlen
))
3110 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
3116 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3118 * The context field in the sctp_sndrcvinfo structure is normally only
3119 * used when a failed message is retrieved holding the value that was
3120 * sent down on the actual send call. This option allows the setting of
3121 * a default context on an association basis that will be received on
3122 * reading messages from the peer. This is especially helpful in the
3123 * one-2-many model for an application to keep some reference to an
3124 * internal state machine that is processing messages on the
3125 * association. Note that the setting of this value only effects
3126 * received messages from the peer and does not effect the value that is
3127 * saved with outbound messages.
3129 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
3130 unsigned int optlen
)
3132 struct sctp_assoc_value params
;
3133 struct sctp_sock
*sp
;
3134 struct sctp_association
*asoc
;
3136 if (optlen
!= sizeof(struct sctp_assoc_value
))
3138 if (copy_from_user(¶ms
, optval
, optlen
))
3143 if (params
.assoc_id
!= 0) {
3144 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3147 asoc
->default_rcv_context
= params
.assoc_value
;
3149 sp
->default_rcv_context
= params
.assoc_value
;
3156 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3158 * This options will at a minimum specify if the implementation is doing
3159 * fragmented interleave. Fragmented interleave, for a one to many
3160 * socket, is when subsequent calls to receive a message may return
3161 * parts of messages from different associations. Some implementations
3162 * may allow you to turn this value on or off. If so, when turned off,
3163 * no fragment interleave will occur (which will cause a head of line
3164 * blocking amongst multiple associations sharing the same one to many
3165 * socket). When this option is turned on, then each receive call may
3166 * come from a different association (thus the user must receive data
3167 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3168 * association each receive belongs to.
3170 * This option takes a boolean value. A non-zero value indicates that
3171 * fragmented interleave is on. A value of zero indicates that
3172 * fragmented interleave is off.
3174 * Note that it is important that an implementation that allows this
3175 * option to be turned on, have it off by default. Otherwise an unaware
3176 * application using the one to many model may become confused and act
3179 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
3180 char __user
*optval
,
3181 unsigned int optlen
)
3185 if (optlen
!= sizeof(int))
3187 if (get_user(val
, (int __user
*)optval
))
3190 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
3196 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3197 * (SCTP_PARTIAL_DELIVERY_POINT)
3199 * This option will set or get the SCTP partial delivery point. This
3200 * point is the size of a message where the partial delivery API will be
3201 * invoked to help free up rwnd space for the peer. Setting this to a
3202 * lower value will cause partial deliveries to happen more often. The
3203 * calls argument is an integer that sets or gets the partial delivery
3204 * point. Note also that the call will fail if the user attempts to set
3205 * this value larger than the socket receive buffer size.
3207 * Note that any single message having a length smaller than or equal to
3208 * the SCTP partial delivery point will be delivered in one single read
3209 * call as long as the user provided buffer is large enough to hold the
3212 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
3213 char __user
*optval
,
3214 unsigned int optlen
)
3218 if (optlen
!= sizeof(u32
))
3220 if (get_user(val
, (int __user
*)optval
))
3223 /* Note: We double the receive buffer from what the user sets
3224 * it to be, also initial rwnd is based on rcvbuf/2.
3226 if (val
> (sk
->sk_rcvbuf
>> 1))
3229 sctp_sk(sk
)->pd_point
= val
;
3231 return 0; /* is this the right error code? */
3235 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3237 * This option will allow a user to change the maximum burst of packets
3238 * that can be emitted by this association. Note that the default value
3239 * is 4, and some implementations may restrict this setting so that it
3240 * can only be lowered.
3242 * NOTE: This text doesn't seem right. Do this on a socket basis with
3243 * future associations inheriting the socket value.
3245 static int sctp_setsockopt_maxburst(struct sock
*sk
,
3246 char __user
*optval
,
3247 unsigned int optlen
)
3249 struct sctp_assoc_value params
;
3250 struct sctp_sock
*sp
;
3251 struct sctp_association
*asoc
;
3255 if (optlen
== sizeof(int)) {
3256 pr_warn("Use of int in max_burst socket option deprecated\n");
3257 pr_warn("Use struct sctp_assoc_value instead\n");
3258 if (copy_from_user(&val
, optval
, optlen
))
3260 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3261 if (copy_from_user(¶ms
, optval
, optlen
))
3263 val
= params
.assoc_value
;
3264 assoc_id
= params
.assoc_id
;
3270 if (assoc_id
!= 0) {
3271 asoc
= sctp_id2assoc(sk
, assoc_id
);
3274 asoc
->max_burst
= val
;
3276 sp
->max_burst
= val
;
3282 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3284 * This set option adds a chunk type that the user is requesting to be
3285 * received only in an authenticated way. Changes to the list of chunks
3286 * will only effect future associations on the socket.
3288 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
3289 char __user
*optval
,
3290 unsigned int optlen
)
3292 struct net
*net
= sock_net(sk
);
3293 struct sctp_authchunk val
;
3295 if (!net
->sctp
.auth_enable
)
3298 if (optlen
!= sizeof(struct sctp_authchunk
))
3300 if (copy_from_user(&val
, optval
, optlen
))
3303 switch (val
.sauth_chunk
) {
3305 case SCTP_CID_INIT_ACK
:
3306 case SCTP_CID_SHUTDOWN_COMPLETE
:
3311 /* add this chunk id to the endpoint */
3312 return sctp_auth_ep_add_chunkid(sctp_sk(sk
)->ep
, val
.sauth_chunk
);
3316 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3318 * This option gets or sets the list of HMAC algorithms that the local
3319 * endpoint requires the peer to use.
3321 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
3322 char __user
*optval
,
3323 unsigned int optlen
)
3325 struct net
*net
= sock_net(sk
);
3326 struct sctp_hmacalgo
*hmacs
;
3330 if (!net
->sctp
.auth_enable
)
3333 if (optlen
< sizeof(struct sctp_hmacalgo
))
3336 hmacs
= memdup_user(optval
, optlen
);
3338 return PTR_ERR(hmacs
);
3340 idents
= hmacs
->shmac_num_idents
;
3341 if (idents
== 0 || idents
> SCTP_AUTH_NUM_HMACS
||
3342 (idents
* sizeof(u16
)) > (optlen
- sizeof(struct sctp_hmacalgo
))) {
3347 err
= sctp_auth_ep_set_hmacs(sctp_sk(sk
)->ep
, hmacs
);
3354 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3356 * This option will set a shared secret key which is used to build an
3357 * association shared key.
3359 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3360 char __user
*optval
,
3361 unsigned int optlen
)
3363 struct net
*net
= sock_net(sk
);
3364 struct sctp_authkey
*authkey
;
3365 struct sctp_association
*asoc
;
3368 if (!net
->sctp
.auth_enable
)
3371 if (optlen
<= sizeof(struct sctp_authkey
))
3374 authkey
= memdup_user(optval
, optlen
);
3375 if (IS_ERR(authkey
))
3376 return PTR_ERR(authkey
);
3378 if (authkey
->sca_keylength
> optlen
- sizeof(struct sctp_authkey
)) {
3383 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3384 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3389 ret
= sctp_auth_set_key(sctp_sk(sk
)->ep
, asoc
, authkey
);
3396 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3398 * This option will get or set the active shared key to be used to build
3399 * the association shared key.
3401 static int sctp_setsockopt_active_key(struct sock
*sk
,
3402 char __user
*optval
,
3403 unsigned int optlen
)
3405 struct net
*net
= sock_net(sk
);
3406 struct sctp_authkeyid val
;
3407 struct sctp_association
*asoc
;
3409 if (!net
->sctp
.auth_enable
)
3412 if (optlen
!= sizeof(struct sctp_authkeyid
))
3414 if (copy_from_user(&val
, optval
, optlen
))
3417 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3418 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3421 return sctp_auth_set_active_key(sctp_sk(sk
)->ep
, asoc
,
3422 val
.scact_keynumber
);
3426 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3428 * This set option will delete a shared secret key from use.
3430 static int sctp_setsockopt_del_key(struct sock
*sk
,
3431 char __user
*optval
,
3432 unsigned int optlen
)
3434 struct net
*net
= sock_net(sk
);
3435 struct sctp_authkeyid val
;
3436 struct sctp_association
*asoc
;
3438 if (!net
->sctp
.auth_enable
)
3441 if (optlen
!= sizeof(struct sctp_authkeyid
))
3443 if (copy_from_user(&val
, optval
, optlen
))
3446 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3447 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3450 return sctp_auth_del_key_id(sctp_sk(sk
)->ep
, asoc
,
3451 val
.scact_keynumber
);
3456 * 8.1.23 SCTP_AUTO_ASCONF
3458 * This option will enable or disable the use of the automatic generation of
3459 * ASCONF chunks to add and delete addresses to an existing association. Note
3460 * that this option has two caveats namely: a) it only affects sockets that
3461 * are bound to all addresses available to the SCTP stack, and b) the system
3462 * administrator may have an overriding control that turns the ASCONF feature
3463 * off no matter what setting the socket option may have.
3464 * This option expects an integer boolean flag, where a non-zero value turns on
3465 * the option, and a zero value turns off the option.
3466 * Note. In this implementation, socket operation overrides default parameter
3467 * being set by sysctl as well as FreeBSD implementation
3469 static int sctp_setsockopt_auto_asconf(struct sock
*sk
, char __user
*optval
,
3470 unsigned int optlen
)
3473 struct sctp_sock
*sp
= sctp_sk(sk
);
3475 if (optlen
< sizeof(int))
3477 if (get_user(val
, (int __user
*)optval
))
3479 if (!sctp_is_ep_boundall(sk
) && val
)
3481 if ((val
&& sp
->do_auto_asconf
) || (!val
&& !sp
->do_auto_asconf
))
3484 if (val
== 0 && sp
->do_auto_asconf
) {
3485 list_del(&sp
->auto_asconf_list
);
3486 sp
->do_auto_asconf
= 0;
3487 } else if (val
&& !sp
->do_auto_asconf
) {
3488 list_add_tail(&sp
->auto_asconf_list
,
3489 &sock_net(sk
)->sctp
.auto_asconf_splist
);
3490 sp
->do_auto_asconf
= 1;
3497 * SCTP_PEER_ADDR_THLDS
3499 * This option allows us to alter the partially failed threshold for one or all
3500 * transports in an association. See Section 6.1 of:
3501 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3503 static int sctp_setsockopt_paddr_thresholds(struct sock
*sk
,
3504 char __user
*optval
,
3505 unsigned int optlen
)
3507 struct sctp_paddrthlds val
;
3508 struct sctp_transport
*trans
;
3509 struct sctp_association
*asoc
;
3511 if (optlen
< sizeof(struct sctp_paddrthlds
))
3513 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
,
3514 sizeof(struct sctp_paddrthlds
)))
3518 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
3519 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
3522 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
3524 if (val
.spt_pathmaxrxt
)
3525 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3526 trans
->pf_retrans
= val
.spt_pathpfthld
;
3529 if (val
.spt_pathmaxrxt
)
3530 asoc
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3531 asoc
->pf_retrans
= val
.spt_pathpfthld
;
3533 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
3538 if (val
.spt_pathmaxrxt
)
3539 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3540 trans
->pf_retrans
= val
.spt_pathpfthld
;
3546 /* API 6.2 setsockopt(), getsockopt()
3548 * Applications use setsockopt() and getsockopt() to set or retrieve
3549 * socket options. Socket options are used to change the default
3550 * behavior of sockets calls. They are described in Section 7.
3554 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3555 * int __user *optlen);
3556 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3559 * sd - the socket descript.
3560 * level - set to IPPROTO_SCTP for all SCTP options.
3561 * optname - the option name.
3562 * optval - the buffer to store the value of the option.
3563 * optlen - the size of the buffer.
3565 static int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3566 char __user
*optval
, unsigned int optlen
)
3570 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
3572 /* I can hardly begin to describe how wrong this is. This is
3573 * so broken as to be worse than useless. The API draft
3574 * REALLY is NOT helpful here... I am not convinced that the
3575 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3576 * are at all well-founded.
3578 if (level
!= SOL_SCTP
) {
3579 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3580 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3587 case SCTP_SOCKOPT_BINDX_ADD
:
3588 /* 'optlen' is the size of the addresses buffer. */
3589 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3590 optlen
, SCTP_BINDX_ADD_ADDR
);
3593 case SCTP_SOCKOPT_BINDX_REM
:
3594 /* 'optlen' is the size of the addresses buffer. */
3595 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3596 optlen
, SCTP_BINDX_REM_ADDR
);
3599 case SCTP_SOCKOPT_CONNECTX_OLD
:
3600 /* 'optlen' is the size of the addresses buffer. */
3601 retval
= sctp_setsockopt_connectx_old(sk
,
3602 (struct sockaddr __user
*)optval
,
3606 case SCTP_SOCKOPT_CONNECTX
:
3607 /* 'optlen' is the size of the addresses buffer. */
3608 retval
= sctp_setsockopt_connectx(sk
,
3609 (struct sockaddr __user
*)optval
,
3613 case SCTP_DISABLE_FRAGMENTS
:
3614 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3618 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3621 case SCTP_AUTOCLOSE
:
3622 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3625 case SCTP_PEER_ADDR_PARAMS
:
3626 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3629 case SCTP_DELAYED_SACK
:
3630 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3632 case SCTP_PARTIAL_DELIVERY_POINT
:
3633 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3637 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3639 case SCTP_DEFAULT_SEND_PARAM
:
3640 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3643 case SCTP_PRIMARY_ADDR
:
3644 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3646 case SCTP_SET_PEER_PRIMARY_ADDR
:
3647 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3650 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3653 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3655 case SCTP_ASSOCINFO
:
3656 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3658 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3659 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3662 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3664 case SCTP_ADAPTATION_LAYER
:
3665 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3668 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3670 case SCTP_FRAGMENT_INTERLEAVE
:
3671 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3673 case SCTP_MAX_BURST
:
3674 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3676 case SCTP_AUTH_CHUNK
:
3677 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3679 case SCTP_HMAC_IDENT
:
3680 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3683 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3685 case SCTP_AUTH_ACTIVE_KEY
:
3686 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3688 case SCTP_AUTH_DELETE_KEY
:
3689 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3691 case SCTP_AUTO_ASCONF
:
3692 retval
= sctp_setsockopt_auto_asconf(sk
, optval
, optlen
);
3694 case SCTP_PEER_ADDR_THLDS
:
3695 retval
= sctp_setsockopt_paddr_thresholds(sk
, optval
, optlen
);
3698 retval
= -ENOPROTOOPT
;
3702 sctp_release_sock(sk
);
3708 /* API 3.1.6 connect() - UDP Style Syntax
3710 * An application may use the connect() call in the UDP model to initiate an
3711 * association without sending data.
3715 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3717 * sd: the socket descriptor to have a new association added to.
3719 * nam: the address structure (either struct sockaddr_in or struct
3720 * sockaddr_in6 defined in RFC2553 [7]).
3722 * len: the size of the address.
3724 static int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3732 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__
, sk
,
3735 /* Validate addr_len before calling common connect/connectx routine. */
3736 af
= sctp_get_af_specific(addr
->sa_family
);
3737 if (!af
|| addr_len
< af
->sockaddr_len
) {
3740 /* Pass correct addr len to common routine (so it knows there
3741 * is only one address being passed.
3743 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
3746 sctp_release_sock(sk
);
3750 /* FIXME: Write comments. */
3751 static int sctp_disconnect(struct sock
*sk
, int flags
)
3753 return -EOPNOTSUPP
; /* STUB */
3756 /* 4.1.4 accept() - TCP Style Syntax
3758 * Applications use accept() call to remove an established SCTP
3759 * association from the accept queue of the endpoint. A new socket
3760 * descriptor will be returned from accept() to represent the newly
3761 * formed association.
3763 static struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3765 struct sctp_sock
*sp
;
3766 struct sctp_endpoint
*ep
;
3767 struct sock
*newsk
= NULL
;
3768 struct sctp_association
*asoc
;
3777 if (!sctp_style(sk
, TCP
)) {
3778 error
= -EOPNOTSUPP
;
3782 if (!sctp_sstate(sk
, LISTENING
)) {
3787 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3789 error
= sctp_wait_for_accept(sk
, timeo
);
3793 /* We treat the list of associations on the endpoint as the accept
3794 * queue and pick the first association on the list.
3796 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3798 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3804 /* Populate the fields of the newsk from the oldsk and migrate the
3805 * asoc to the newsk.
3807 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3810 sctp_release_sock(sk
);
3815 /* The SCTP ioctl handler. */
3816 static int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3823 * SEQPACKET-style sockets in LISTENING state are valid, for
3824 * SCTP, so only discard TCP-style sockets in LISTENING state.
3826 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
3831 struct sk_buff
*skb
;
3832 unsigned int amount
= 0;
3834 skb
= skb_peek(&sk
->sk_receive_queue
);
3837 * We will only return the amount of this packet since
3838 * that is all that will be read.
3842 rc
= put_user(amount
, (int __user
*)arg
);
3850 sctp_release_sock(sk
);
3854 /* This is the function which gets called during socket creation to
3855 * initialized the SCTP-specific portion of the sock.
3856 * The sock structure should already be zero-filled memory.
3858 static int sctp_init_sock(struct sock
*sk
)
3860 struct net
*net
= sock_net(sk
);
3861 struct sctp_sock
*sp
;
3863 pr_debug("%s: sk:%p\n", __func__
, sk
);
3867 /* Initialize the SCTP per socket area. */
3868 switch (sk
->sk_type
) {
3869 case SOCK_SEQPACKET
:
3870 sp
->type
= SCTP_SOCKET_UDP
;
3873 sp
->type
= SCTP_SOCKET_TCP
;
3876 return -ESOCKTNOSUPPORT
;
3879 /* Initialize default send parameters. These parameters can be
3880 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3882 sp
->default_stream
= 0;
3883 sp
->default_ppid
= 0;
3884 sp
->default_flags
= 0;
3885 sp
->default_context
= 0;
3886 sp
->default_timetolive
= 0;
3888 sp
->default_rcv_context
= 0;
3889 sp
->max_burst
= net
->sctp
.max_burst
;
3891 sp
->sctp_hmac_alg
= net
->sctp
.sctp_hmac_alg
;
3893 /* Initialize default setup parameters. These parameters
3894 * can be modified with the SCTP_INITMSG socket option or
3895 * overridden by the SCTP_INIT CMSG.
3897 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3898 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3899 sp
->initmsg
.sinit_max_attempts
= net
->sctp
.max_retrans_init
;
3900 sp
->initmsg
.sinit_max_init_timeo
= net
->sctp
.rto_max
;
3902 /* Initialize default RTO related parameters. These parameters can
3903 * be modified for with the SCTP_RTOINFO socket option.
3905 sp
->rtoinfo
.srto_initial
= net
->sctp
.rto_initial
;
3906 sp
->rtoinfo
.srto_max
= net
->sctp
.rto_max
;
3907 sp
->rtoinfo
.srto_min
= net
->sctp
.rto_min
;
3909 /* Initialize default association related parameters. These parameters
3910 * can be modified with the SCTP_ASSOCINFO socket option.
3912 sp
->assocparams
.sasoc_asocmaxrxt
= net
->sctp
.max_retrans_association
;
3913 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3914 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3915 sp
->assocparams
.sasoc_local_rwnd
= 0;
3916 sp
->assocparams
.sasoc_cookie_life
= net
->sctp
.valid_cookie_life
;
3918 /* Initialize default event subscriptions. By default, all the
3921 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3923 /* Default Peer Address Parameters. These defaults can
3924 * be modified via SCTP_PEER_ADDR_PARAMS
3926 sp
->hbinterval
= net
->sctp
.hb_interval
;
3927 sp
->pathmaxrxt
= net
->sctp
.max_retrans_path
;
3928 sp
->pathmtu
= 0; // allow default discovery
3929 sp
->sackdelay
= net
->sctp
.sack_timeout
;
3931 sp
->param_flags
= SPP_HB_ENABLE
|
3933 SPP_SACKDELAY_ENABLE
;
3935 /* If enabled no SCTP message fragmentation will be performed.
3936 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3938 sp
->disable_fragments
= 0;
3940 /* Enable Nagle algorithm by default. */
3943 /* Enable by default. */
3946 /* Auto-close idle associations after the configured
3947 * number of seconds. A value of 0 disables this
3948 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3949 * for UDP-style sockets only.
3953 /* User specified fragmentation limit. */
3956 sp
->adaptation_ind
= 0;
3958 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3960 /* Control variables for partial data delivery. */
3961 atomic_set(&sp
->pd_mode
, 0);
3962 skb_queue_head_init(&sp
->pd_lobby
);
3963 sp
->frag_interleave
= 0;
3965 /* Create a per socket endpoint structure. Even if we
3966 * change the data structure relationships, this may still
3967 * be useful for storing pre-connect address information.
3969 sp
->ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3975 sk
->sk_destruct
= sctp_destruct_sock
;
3977 SCTP_DBG_OBJCNT_INC(sock
);
3980 percpu_counter_inc(&sctp_sockets_allocated
);
3981 sock_prot_inuse_add(net
, sk
->sk_prot
, 1);
3982 if (net
->sctp
.default_auto_asconf
) {
3983 list_add_tail(&sp
->auto_asconf_list
,
3984 &net
->sctp
.auto_asconf_splist
);
3985 sp
->do_auto_asconf
= 1;
3987 sp
->do_auto_asconf
= 0;
3993 /* Cleanup any SCTP per socket resources. */
3994 static void sctp_destroy_sock(struct sock
*sk
)
3996 struct sctp_sock
*sp
;
3998 pr_debug("%s: sk:%p\n", __func__
, sk
);
4000 /* Release our hold on the endpoint. */
4002 /* This could happen during socket init, thus we bail out
4003 * early, since the rest of the below is not setup either.
4008 if (sp
->do_auto_asconf
) {
4009 sp
->do_auto_asconf
= 0;
4010 list_del(&sp
->auto_asconf_list
);
4012 sctp_endpoint_free(sp
->ep
);
4014 percpu_counter_dec(&sctp_sockets_allocated
);
4015 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
4019 /* Triggered when there are no references on the socket anymore */
4020 static void sctp_destruct_sock(struct sock
*sk
)
4022 struct sctp_sock
*sp
= sctp_sk(sk
);
4024 /* Free up the HMAC transform. */
4025 crypto_free_hash(sp
->hmac
);
4027 inet_sock_destruct(sk
);
4030 /* API 4.1.7 shutdown() - TCP Style Syntax
4031 * int shutdown(int socket, int how);
4033 * sd - the socket descriptor of the association to be closed.
4034 * how - Specifies the type of shutdown. The values are
4037 * Disables further receive operations. No SCTP
4038 * protocol action is taken.
4040 * Disables further send operations, and initiates
4041 * the SCTP shutdown sequence.
4043 * Disables further send and receive operations
4044 * and initiates the SCTP shutdown sequence.
4046 static void sctp_shutdown(struct sock
*sk
, int how
)
4048 struct net
*net
= sock_net(sk
);
4049 struct sctp_endpoint
*ep
;
4050 struct sctp_association
*asoc
;
4052 if (!sctp_style(sk
, TCP
))
4055 if (how
& SEND_SHUTDOWN
) {
4056 ep
= sctp_sk(sk
)->ep
;
4057 if (!list_empty(&ep
->asocs
)) {
4058 asoc
= list_entry(ep
->asocs
.next
,
4059 struct sctp_association
, asocs
);
4060 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
4065 /* 7.2.1 Association Status (SCTP_STATUS)
4067 * Applications can retrieve current status information about an
4068 * association, including association state, peer receiver window size,
4069 * number of unacked data chunks, and number of data chunks pending
4070 * receipt. This information is read-only.
4072 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
4073 char __user
*optval
,
4076 struct sctp_status status
;
4077 struct sctp_association
*asoc
= NULL
;
4078 struct sctp_transport
*transport
;
4079 sctp_assoc_t associd
;
4082 if (len
< sizeof(status
)) {
4087 len
= sizeof(status
);
4088 if (copy_from_user(&status
, optval
, len
)) {
4093 associd
= status
.sstat_assoc_id
;
4094 asoc
= sctp_id2assoc(sk
, associd
);
4100 transport
= asoc
->peer
.primary_path
;
4102 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
4103 status
.sstat_state
= asoc
->state
;
4104 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
4105 status
.sstat_unackdata
= asoc
->unack_data
;
4107 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4108 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
4109 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
4110 status
.sstat_fragmentation_point
= asoc
->frag_point
;
4111 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4112 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
4113 transport
->af_specific
->sockaddr_len
);
4114 /* Map ipv4 address into v4-mapped-on-v6 address. */
4115 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4116 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
4117 status
.sstat_primary
.spinfo_state
= transport
->state
;
4118 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
4119 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
4120 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4121 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
4123 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
4124 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
4126 if (put_user(len
, optlen
)) {
4131 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4132 __func__
, len
, status
.sstat_state
, status
.sstat_rwnd
,
4133 status
.sstat_assoc_id
);
4135 if (copy_to_user(optval
, &status
, len
)) {
4145 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4147 * Applications can retrieve information about a specific peer address
4148 * of an association, including its reachability state, congestion
4149 * window, and retransmission timer values. This information is
4152 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
4153 char __user
*optval
,
4156 struct sctp_paddrinfo pinfo
;
4157 struct sctp_transport
*transport
;
4160 if (len
< sizeof(pinfo
)) {
4165 len
= sizeof(pinfo
);
4166 if (copy_from_user(&pinfo
, optval
, len
)) {
4171 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
4172 pinfo
.spinfo_assoc_id
);
4176 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4177 pinfo
.spinfo_state
= transport
->state
;
4178 pinfo
.spinfo_cwnd
= transport
->cwnd
;
4179 pinfo
.spinfo_srtt
= transport
->srtt
;
4180 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4181 pinfo
.spinfo_mtu
= transport
->pathmtu
;
4183 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
4184 pinfo
.spinfo_state
= SCTP_ACTIVE
;
4186 if (put_user(len
, optlen
)) {
4191 if (copy_to_user(optval
, &pinfo
, len
)) {
4200 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4202 * This option is a on/off flag. If enabled no SCTP message
4203 * fragmentation will be performed. Instead if a message being sent
4204 * exceeds the current PMTU size, the message will NOT be sent and
4205 * instead a error will be indicated to the user.
4207 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
4208 char __user
*optval
, int __user
*optlen
)
4212 if (len
< sizeof(int))
4216 val
= (sctp_sk(sk
)->disable_fragments
== 1);
4217 if (put_user(len
, optlen
))
4219 if (copy_to_user(optval
, &val
, len
))
4224 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4226 * This socket option is used to specify various notifications and
4227 * ancillary data the user wishes to receive.
4229 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
4234 if (len
> sizeof(struct sctp_event_subscribe
))
4235 len
= sizeof(struct sctp_event_subscribe
);
4236 if (put_user(len
, optlen
))
4238 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
4243 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4245 * This socket option is applicable to the UDP-style socket only. When
4246 * set it will cause associations that are idle for more than the
4247 * specified number of seconds to automatically close. An association
4248 * being idle is defined an association that has NOT sent or received
4249 * user data. The special value of '0' indicates that no automatic
4250 * close of any associations should be performed. The option expects an
4251 * integer defining the number of seconds of idle time before an
4252 * association is closed.
4254 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4256 /* Applicable to UDP-style socket only */
4257 if (sctp_style(sk
, TCP
))
4259 if (len
< sizeof(int))
4262 if (put_user(len
, optlen
))
4264 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
4269 /* Helper routine to branch off an association to a new socket. */
4270 int sctp_do_peeloff(struct sock
*sk
, sctp_assoc_t id
, struct socket
**sockp
)
4272 struct sctp_association
*asoc
= sctp_id2assoc(sk
, id
);
4273 struct socket
*sock
;
4280 /* An association cannot be branched off from an already peeled-off
4281 * socket, nor is this supported for tcp style sockets.
4283 if (!sctp_style(sk
, UDP
))
4286 /* Create a new socket. */
4287 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
4291 sctp_copy_sock(sock
->sk
, sk
, asoc
);
4293 /* Make peeled-off sockets more like 1-1 accepted sockets.
4294 * Set the daddr and initialize id to something more random
4296 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
4297 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
4299 /* Populate the fields of the newsk from the oldsk and migrate the
4300 * asoc to the newsk.
4302 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
4308 EXPORT_SYMBOL(sctp_do_peeloff
);
4310 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4312 sctp_peeloff_arg_t peeloff
;
4313 struct socket
*newsock
;
4314 struct file
*newfile
;
4317 if (len
< sizeof(sctp_peeloff_arg_t
))
4319 len
= sizeof(sctp_peeloff_arg_t
);
4320 if (copy_from_user(&peeloff
, optval
, len
))
4323 retval
= sctp_do_peeloff(sk
, peeloff
.associd
, &newsock
);
4327 /* Map the socket to an unused fd that can be returned to the user. */
4328 retval
= get_unused_fd_flags(0);
4330 sock_release(newsock
);
4334 newfile
= sock_alloc_file(newsock
, 0, NULL
);
4335 if (unlikely(IS_ERR(newfile
))) {
4336 put_unused_fd(retval
);
4337 sock_release(newsock
);
4338 return PTR_ERR(newfile
);
4341 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__
, sk
, newsock
->sk
,
4344 /* Return the fd mapped to the new socket. */
4345 if (put_user(len
, optlen
)) {
4347 put_unused_fd(retval
);
4350 peeloff
.sd
= retval
;
4351 if (copy_to_user(optval
, &peeloff
, len
)) {
4353 put_unused_fd(retval
);
4356 fd_install(retval
, newfile
);
4361 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4363 * Applications can enable or disable heartbeats for any peer address of
4364 * an association, modify an address's heartbeat interval, force a
4365 * heartbeat to be sent immediately, and adjust the address's maximum
4366 * number of retransmissions sent before an address is considered
4367 * unreachable. The following structure is used to access and modify an
4368 * address's parameters:
4370 * struct sctp_paddrparams {
4371 * sctp_assoc_t spp_assoc_id;
4372 * struct sockaddr_storage spp_address;
4373 * uint32_t spp_hbinterval;
4374 * uint16_t spp_pathmaxrxt;
4375 * uint32_t spp_pathmtu;
4376 * uint32_t spp_sackdelay;
4377 * uint32_t spp_flags;
4380 * spp_assoc_id - (one-to-many style socket) This is filled in the
4381 * application, and identifies the association for
4383 * spp_address - This specifies which address is of interest.
4384 * spp_hbinterval - This contains the value of the heartbeat interval,
4385 * in milliseconds. If a value of zero
4386 * is present in this field then no changes are to
4387 * be made to this parameter.
4388 * spp_pathmaxrxt - This contains the maximum number of
4389 * retransmissions before this address shall be
4390 * considered unreachable. If a value of zero
4391 * is present in this field then no changes are to
4392 * be made to this parameter.
4393 * spp_pathmtu - When Path MTU discovery is disabled the value
4394 * specified here will be the "fixed" path mtu.
4395 * Note that if the spp_address field is empty
4396 * then all associations on this address will
4397 * have this fixed path mtu set upon them.
4399 * spp_sackdelay - When delayed sack is enabled, this value specifies
4400 * the number of milliseconds that sacks will be delayed
4401 * for. This value will apply to all addresses of an
4402 * association if the spp_address field is empty. Note
4403 * also, that if delayed sack is enabled and this
4404 * value is set to 0, no change is made to the last
4405 * recorded delayed sack timer value.
4407 * spp_flags - These flags are used to control various features
4408 * on an association. The flag field may contain
4409 * zero or more of the following options.
4411 * SPP_HB_ENABLE - Enable heartbeats on the
4412 * specified address. Note that if the address
4413 * field is empty all addresses for the association
4414 * have heartbeats enabled upon them.
4416 * SPP_HB_DISABLE - Disable heartbeats on the
4417 * speicifed address. Note that if the address
4418 * field is empty all addresses for the association
4419 * will have their heartbeats disabled. Note also
4420 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4421 * mutually exclusive, only one of these two should
4422 * be specified. Enabling both fields will have
4423 * undetermined results.
4425 * SPP_HB_DEMAND - Request a user initiated heartbeat
4426 * to be made immediately.
4428 * SPP_PMTUD_ENABLE - This field will enable PMTU
4429 * discovery upon the specified address. Note that
4430 * if the address feild is empty then all addresses
4431 * on the association are effected.
4433 * SPP_PMTUD_DISABLE - This field will disable PMTU
4434 * discovery upon the specified address. Note that
4435 * if the address feild is empty then all addresses
4436 * on the association are effected. Not also that
4437 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4438 * exclusive. Enabling both will have undetermined
4441 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4442 * on delayed sack. The time specified in spp_sackdelay
4443 * is used to specify the sack delay for this address. Note
4444 * that if spp_address is empty then all addresses will
4445 * enable delayed sack and take on the sack delay
4446 * value specified in spp_sackdelay.
4447 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4448 * off delayed sack. If the spp_address field is blank then
4449 * delayed sack is disabled for the entire association. Note
4450 * also that this field is mutually exclusive to
4451 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4454 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
4455 char __user
*optval
, int __user
*optlen
)
4457 struct sctp_paddrparams params
;
4458 struct sctp_transport
*trans
= NULL
;
4459 struct sctp_association
*asoc
= NULL
;
4460 struct sctp_sock
*sp
= sctp_sk(sk
);
4462 if (len
< sizeof(struct sctp_paddrparams
))
4464 len
= sizeof(struct sctp_paddrparams
);
4465 if (copy_from_user(¶ms
, optval
, len
))
4468 /* If an address other than INADDR_ANY is specified, and
4469 * no transport is found, then the request is invalid.
4471 if (!sctp_is_any(sk
, ( union sctp_addr
*)¶ms
.spp_address
)) {
4472 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
4473 params
.spp_assoc_id
);
4475 pr_debug("%s: failed no transport\n", __func__
);
4480 /* Get association, if assoc_id != 0 and the socket is a one
4481 * to many style socket, and an association was not found, then
4482 * the id was invalid.
4484 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
4485 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
4486 pr_debug("%s: failed no association\n", __func__
);
4491 /* Fetch transport values. */
4492 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
4493 params
.spp_pathmtu
= trans
->pathmtu
;
4494 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
4495 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
4497 /*draft-11 doesn't say what to return in spp_flags*/
4498 params
.spp_flags
= trans
->param_flags
;
4500 /* Fetch association values. */
4501 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
4502 params
.spp_pathmtu
= asoc
->pathmtu
;
4503 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
4504 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
4506 /*draft-11 doesn't say what to return in spp_flags*/
4507 params
.spp_flags
= asoc
->param_flags
;
4509 /* Fetch socket values. */
4510 params
.spp_hbinterval
= sp
->hbinterval
;
4511 params
.spp_pathmtu
= sp
->pathmtu
;
4512 params
.spp_sackdelay
= sp
->sackdelay
;
4513 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
4515 /*draft-11 doesn't say what to return in spp_flags*/
4516 params
.spp_flags
= sp
->param_flags
;
4519 if (copy_to_user(optval
, ¶ms
, len
))
4522 if (put_user(len
, optlen
))
4529 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4531 * This option will effect the way delayed acks are performed. This
4532 * option allows you to get or set the delayed ack time, in
4533 * milliseconds. It also allows changing the delayed ack frequency.
4534 * Changing the frequency to 1 disables the delayed sack algorithm. If
4535 * the assoc_id is 0, then this sets or gets the endpoints default
4536 * values. If the assoc_id field is non-zero, then the set or get
4537 * effects the specified association for the one to many model (the
4538 * assoc_id field is ignored by the one to one model). Note that if
4539 * sack_delay or sack_freq are 0 when setting this option, then the
4540 * current values will remain unchanged.
4542 * struct sctp_sack_info {
4543 * sctp_assoc_t sack_assoc_id;
4544 * uint32_t sack_delay;
4545 * uint32_t sack_freq;
4548 * sack_assoc_id - This parameter, indicates which association the user
4549 * is performing an action upon. Note that if this field's value is
4550 * zero then the endpoints default value is changed (effecting future
4551 * associations only).
4553 * sack_delay - This parameter contains the number of milliseconds that
4554 * the user is requesting the delayed ACK timer be set to. Note that
4555 * this value is defined in the standard to be between 200 and 500
4558 * sack_freq - This parameter contains the number of packets that must
4559 * be received before a sack is sent without waiting for the delay
4560 * timer to expire. The default value for this is 2, setting this
4561 * value to 1 will disable the delayed sack algorithm.
4563 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
4564 char __user
*optval
,
4567 struct sctp_sack_info params
;
4568 struct sctp_association
*asoc
= NULL
;
4569 struct sctp_sock
*sp
= sctp_sk(sk
);
4571 if (len
>= sizeof(struct sctp_sack_info
)) {
4572 len
= sizeof(struct sctp_sack_info
);
4574 if (copy_from_user(¶ms
, optval
, len
))
4576 } else if (len
== sizeof(struct sctp_assoc_value
)) {
4577 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4578 pr_warn("Use struct sctp_sack_info instead\n");
4579 if (copy_from_user(¶ms
, optval
, len
))
4584 /* Get association, if sack_assoc_id != 0 and the socket is a one
4585 * to many style socket, and an association was not found, then
4586 * the id was invalid.
4588 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
4589 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
4593 /* Fetch association values. */
4594 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4595 params
.sack_delay
= jiffies_to_msecs(
4597 params
.sack_freq
= asoc
->sackfreq
;
4600 params
.sack_delay
= 0;
4601 params
.sack_freq
= 1;
4604 /* Fetch socket values. */
4605 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4606 params
.sack_delay
= sp
->sackdelay
;
4607 params
.sack_freq
= sp
->sackfreq
;
4609 params
.sack_delay
= 0;
4610 params
.sack_freq
= 1;
4614 if (copy_to_user(optval
, ¶ms
, len
))
4617 if (put_user(len
, optlen
))
4623 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4625 * Applications can specify protocol parameters for the default association
4626 * initialization. The option name argument to setsockopt() and getsockopt()
4629 * Setting initialization parameters is effective only on an unconnected
4630 * socket (for UDP-style sockets only future associations are effected
4631 * by the change). With TCP-style sockets, this option is inherited by
4632 * sockets derived from a listener socket.
4634 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4636 if (len
< sizeof(struct sctp_initmsg
))
4638 len
= sizeof(struct sctp_initmsg
);
4639 if (put_user(len
, optlen
))
4641 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
4647 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4648 char __user
*optval
, int __user
*optlen
)
4650 struct sctp_association
*asoc
;
4652 struct sctp_getaddrs getaddrs
;
4653 struct sctp_transport
*from
;
4655 union sctp_addr temp
;
4656 struct sctp_sock
*sp
= sctp_sk(sk
);
4661 if (len
< sizeof(struct sctp_getaddrs
))
4664 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4667 /* For UDP-style sockets, id specifies the association to query. */
4668 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4672 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4673 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4675 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
4677 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4678 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4679 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4680 if (space_left
< addrlen
)
4682 if (copy_to_user(to
, &temp
, addrlen
))
4686 space_left
-= addrlen
;
4689 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4691 bytes_copied
= ((char __user
*)to
) - optval
;
4692 if (put_user(bytes_copied
, optlen
))
4698 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4699 size_t space_left
, int *bytes_copied
)
4701 struct sctp_sockaddr_entry
*addr
;
4702 union sctp_addr temp
;
4705 struct net
*net
= sock_net(sk
);
4708 list_for_each_entry_rcu(addr
, &net
->sctp
.local_addr_list
, list
) {
4712 if ((PF_INET
== sk
->sk_family
) &&
4713 (AF_INET6
== addr
->a
.sa
.sa_family
))
4715 if ((PF_INET6
== sk
->sk_family
) &&
4716 inet_v6_ipv6only(sk
) &&
4717 (AF_INET
== addr
->a
.sa
.sa_family
))
4719 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4720 if (!temp
.v4
.sin_port
)
4721 temp
.v4
.sin_port
= htons(port
);
4723 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4725 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4726 if (space_left
< addrlen
) {
4730 memcpy(to
, &temp
, addrlen
);
4734 space_left
-= addrlen
;
4735 *bytes_copied
+= addrlen
;
4743 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4744 char __user
*optval
, int __user
*optlen
)
4746 struct sctp_bind_addr
*bp
;
4747 struct sctp_association
*asoc
;
4749 struct sctp_getaddrs getaddrs
;
4750 struct sctp_sockaddr_entry
*addr
;
4752 union sctp_addr temp
;
4753 struct sctp_sock
*sp
= sctp_sk(sk
);
4757 int bytes_copied
= 0;
4761 if (len
< sizeof(struct sctp_getaddrs
))
4764 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4768 * For UDP-style sockets, id specifies the association to query.
4769 * If the id field is set to the value '0' then the locally bound
4770 * addresses are returned without regard to any particular
4773 if (0 == getaddrs
.assoc_id
) {
4774 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4776 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4779 bp
= &asoc
->base
.bind_addr
;
4782 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4783 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4785 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4789 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4790 * addresses from the global local address list.
4792 if (sctp_list_single_entry(&bp
->address_list
)) {
4793 addr
= list_entry(bp
->address_list
.next
,
4794 struct sctp_sockaddr_entry
, list
);
4795 if (sctp_is_any(sk
, &addr
->a
)) {
4796 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4797 space_left
, &bytes_copied
);
4807 /* Protection on the bound address list is not needed since
4808 * in the socket option context we hold a socket lock and
4809 * thus the bound address list can't change.
4811 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4812 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4813 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4814 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4815 if (space_left
< addrlen
) {
4816 err
= -ENOMEM
; /*fixme: right error?*/
4819 memcpy(buf
, &temp
, addrlen
);
4821 bytes_copied
+= addrlen
;
4823 space_left
-= addrlen
;
4827 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4831 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4835 if (put_user(bytes_copied
, optlen
))
4842 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4844 * Requests that the local SCTP stack use the enclosed peer address as
4845 * the association primary. The enclosed address must be one of the
4846 * association peer's addresses.
4848 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4849 char __user
*optval
, int __user
*optlen
)
4851 struct sctp_prim prim
;
4852 struct sctp_association
*asoc
;
4853 struct sctp_sock
*sp
= sctp_sk(sk
);
4855 if (len
< sizeof(struct sctp_prim
))
4858 len
= sizeof(struct sctp_prim
);
4860 if (copy_from_user(&prim
, optval
, len
))
4863 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4867 if (!asoc
->peer
.primary_path
)
4870 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4871 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4873 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4874 (union sctp_addr
*)&prim
.ssp_addr
);
4876 if (put_user(len
, optlen
))
4878 if (copy_to_user(optval
, &prim
, len
))
4885 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4887 * Requests that the local endpoint set the specified Adaptation Layer
4888 * Indication parameter for all future INIT and INIT-ACK exchanges.
4890 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4891 char __user
*optval
, int __user
*optlen
)
4893 struct sctp_setadaptation adaptation
;
4895 if (len
< sizeof(struct sctp_setadaptation
))
4898 len
= sizeof(struct sctp_setadaptation
);
4900 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4902 if (put_user(len
, optlen
))
4904 if (copy_to_user(optval
, &adaptation
, len
))
4912 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4914 * Applications that wish to use the sendto() system call may wish to
4915 * specify a default set of parameters that would normally be supplied
4916 * through the inclusion of ancillary data. This socket option allows
4917 * such an application to set the default sctp_sndrcvinfo structure.
4920 * The application that wishes to use this socket option simply passes
4921 * in to this call the sctp_sndrcvinfo structure defined in Section
4922 * 5.2.2) The input parameters accepted by this call include
4923 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4924 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4925 * to this call if the caller is using the UDP model.
4927 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4929 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4930 int len
, char __user
*optval
,
4933 struct sctp_sndrcvinfo info
;
4934 struct sctp_association
*asoc
;
4935 struct sctp_sock
*sp
= sctp_sk(sk
);
4937 if (len
< sizeof(struct sctp_sndrcvinfo
))
4940 len
= sizeof(struct sctp_sndrcvinfo
);
4942 if (copy_from_user(&info
, optval
, len
))
4945 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4946 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4950 info
.sinfo_stream
= asoc
->default_stream
;
4951 info
.sinfo_flags
= asoc
->default_flags
;
4952 info
.sinfo_ppid
= asoc
->default_ppid
;
4953 info
.sinfo_context
= asoc
->default_context
;
4954 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4956 info
.sinfo_stream
= sp
->default_stream
;
4957 info
.sinfo_flags
= sp
->default_flags
;
4958 info
.sinfo_ppid
= sp
->default_ppid
;
4959 info
.sinfo_context
= sp
->default_context
;
4960 info
.sinfo_timetolive
= sp
->default_timetolive
;
4963 if (put_user(len
, optlen
))
4965 if (copy_to_user(optval
, &info
, len
))
4973 * 7.1.5 SCTP_NODELAY
4975 * Turn on/off any Nagle-like algorithm. This means that packets are
4976 * generally sent as soon as possible and no unnecessary delays are
4977 * introduced, at the cost of more packets in the network. Expects an
4978 * integer boolean flag.
4981 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4982 char __user
*optval
, int __user
*optlen
)
4986 if (len
< sizeof(int))
4990 val
= (sctp_sk(sk
)->nodelay
== 1);
4991 if (put_user(len
, optlen
))
4993 if (copy_to_user(optval
, &val
, len
))
5000 * 7.1.1 SCTP_RTOINFO
5002 * The protocol parameters used to initialize and bound retransmission
5003 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5004 * and modify these parameters.
5005 * All parameters are time values, in milliseconds. A value of 0, when
5006 * modifying the parameters, indicates that the current value should not
5010 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
5011 char __user
*optval
,
5012 int __user
*optlen
) {
5013 struct sctp_rtoinfo rtoinfo
;
5014 struct sctp_association
*asoc
;
5016 if (len
< sizeof (struct sctp_rtoinfo
))
5019 len
= sizeof(struct sctp_rtoinfo
);
5021 if (copy_from_user(&rtoinfo
, optval
, len
))
5024 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
5026 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
5029 /* Values corresponding to the specific association. */
5031 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
5032 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
5033 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
5035 /* Values corresponding to the endpoint. */
5036 struct sctp_sock
*sp
= sctp_sk(sk
);
5038 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
5039 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
5040 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
5043 if (put_user(len
, optlen
))
5046 if (copy_to_user(optval
, &rtoinfo
, len
))
5054 * 7.1.2 SCTP_ASSOCINFO
5056 * This option is used to tune the maximum retransmission attempts
5057 * of the association.
5058 * Returns an error if the new association retransmission value is
5059 * greater than the sum of the retransmission value of the peer.
5060 * See [SCTP] for more information.
5063 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
5064 char __user
*optval
,
5068 struct sctp_assocparams assocparams
;
5069 struct sctp_association
*asoc
;
5070 struct list_head
*pos
;
5073 if (len
< sizeof (struct sctp_assocparams
))
5076 len
= sizeof(struct sctp_assocparams
);
5078 if (copy_from_user(&assocparams
, optval
, len
))
5081 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
5083 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
5086 /* Values correspoinding to the specific association */
5088 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
5089 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
5090 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
5091 assocparams
.sasoc_cookie_life
= ktime_to_ms(asoc
->cookie_life
);
5093 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
5097 assocparams
.sasoc_number_peer_destinations
= cnt
;
5099 /* Values corresponding to the endpoint */
5100 struct sctp_sock
*sp
= sctp_sk(sk
);
5102 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
5103 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
5104 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
5105 assocparams
.sasoc_cookie_life
=
5106 sp
->assocparams
.sasoc_cookie_life
;
5107 assocparams
.sasoc_number_peer_destinations
=
5109 sasoc_number_peer_destinations
;
5112 if (put_user(len
, optlen
))
5115 if (copy_to_user(optval
, &assocparams
, len
))
5122 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5124 * This socket option is a boolean flag which turns on or off mapped V4
5125 * addresses. If this option is turned on and the socket is type
5126 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5127 * If this option is turned off, then no mapping will be done of V4
5128 * addresses and a user will receive both PF_INET6 and PF_INET type
5129 * addresses on the socket.
5131 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
5132 char __user
*optval
, int __user
*optlen
)
5135 struct sctp_sock
*sp
= sctp_sk(sk
);
5137 if (len
< sizeof(int))
5142 if (put_user(len
, optlen
))
5144 if (copy_to_user(optval
, &val
, len
))
5151 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5152 * (chapter and verse is quoted at sctp_setsockopt_context())
5154 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
5155 char __user
*optval
, int __user
*optlen
)
5157 struct sctp_assoc_value params
;
5158 struct sctp_sock
*sp
;
5159 struct sctp_association
*asoc
;
5161 if (len
< sizeof(struct sctp_assoc_value
))
5164 len
= sizeof(struct sctp_assoc_value
);
5166 if (copy_from_user(¶ms
, optval
, len
))
5171 if (params
.assoc_id
!= 0) {
5172 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5175 params
.assoc_value
= asoc
->default_rcv_context
;
5177 params
.assoc_value
= sp
->default_rcv_context
;
5180 if (put_user(len
, optlen
))
5182 if (copy_to_user(optval
, ¶ms
, len
))
5189 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5190 * This option will get or set the maximum size to put in any outgoing
5191 * SCTP DATA chunk. If a message is larger than this size it will be
5192 * fragmented by SCTP into the specified size. Note that the underlying
5193 * SCTP implementation may fragment into smaller sized chunks when the
5194 * PMTU of the underlying association is smaller than the value set by
5195 * the user. The default value for this option is '0' which indicates
5196 * the user is NOT limiting fragmentation and only the PMTU will effect
5197 * SCTP's choice of DATA chunk size. Note also that values set larger
5198 * than the maximum size of an IP datagram will effectively let SCTP
5199 * control fragmentation (i.e. the same as setting this option to 0).
5201 * The following structure is used to access and modify this parameter:
5203 * struct sctp_assoc_value {
5204 * sctp_assoc_t assoc_id;
5205 * uint32_t assoc_value;
5208 * assoc_id: This parameter is ignored for one-to-one style sockets.
5209 * For one-to-many style sockets this parameter indicates which
5210 * association the user is performing an action upon. Note that if
5211 * this field's value is zero then the endpoints default value is
5212 * changed (effecting future associations only).
5213 * assoc_value: This parameter specifies the maximum size in bytes.
5215 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
5216 char __user
*optval
, int __user
*optlen
)
5218 struct sctp_assoc_value params
;
5219 struct sctp_association
*asoc
;
5221 if (len
== sizeof(int)) {
5222 pr_warn("Use of int in maxseg socket option deprecated\n");
5223 pr_warn("Use struct sctp_assoc_value instead\n");
5224 params
.assoc_id
= 0;
5225 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5226 len
= sizeof(struct sctp_assoc_value
);
5227 if (copy_from_user(¶ms
, optval
, sizeof(params
)))
5232 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5233 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
5237 params
.assoc_value
= asoc
->frag_point
;
5239 params
.assoc_value
= sctp_sk(sk
)->user_frag
;
5241 if (put_user(len
, optlen
))
5243 if (len
== sizeof(int)) {
5244 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5247 if (copy_to_user(optval
, ¶ms
, len
))
5255 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5256 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5258 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
5259 char __user
*optval
, int __user
*optlen
)
5263 if (len
< sizeof(int))
5268 val
= sctp_sk(sk
)->frag_interleave
;
5269 if (put_user(len
, optlen
))
5271 if (copy_to_user(optval
, &val
, len
))
5278 * 7.1.25. Set or Get the sctp partial delivery point
5279 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5281 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
5282 char __user
*optval
,
5287 if (len
< sizeof(u32
))
5292 val
= sctp_sk(sk
)->pd_point
;
5293 if (put_user(len
, optlen
))
5295 if (copy_to_user(optval
, &val
, len
))
5302 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5303 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5305 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5306 char __user
*optval
,
5309 struct sctp_assoc_value params
;
5310 struct sctp_sock
*sp
;
5311 struct sctp_association
*asoc
;
5313 if (len
== sizeof(int)) {
5314 pr_warn("Use of int in max_burst socket option deprecated\n");
5315 pr_warn("Use struct sctp_assoc_value instead\n");
5316 params
.assoc_id
= 0;
5317 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5318 len
= sizeof(struct sctp_assoc_value
);
5319 if (copy_from_user(¶ms
, optval
, len
))
5326 if (params
.assoc_id
!= 0) {
5327 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5330 params
.assoc_value
= asoc
->max_burst
;
5332 params
.assoc_value
= sp
->max_burst
;
5334 if (len
== sizeof(int)) {
5335 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5338 if (copy_to_user(optval
, ¶ms
, len
))
5346 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5347 char __user
*optval
, int __user
*optlen
)
5349 struct net
*net
= sock_net(sk
);
5350 struct sctp_hmacalgo __user
*p
= (void __user
*)optval
;
5351 struct sctp_hmac_algo_param
*hmacs
;
5355 if (!net
->sctp
.auth_enable
)
5358 hmacs
= sctp_sk(sk
)->ep
->auth_hmacs_list
;
5359 data_len
= ntohs(hmacs
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5361 if (len
< sizeof(struct sctp_hmacalgo
) + data_len
)
5364 len
= sizeof(struct sctp_hmacalgo
) + data_len
;
5365 num_idents
= data_len
/ sizeof(u16
);
5367 if (put_user(len
, optlen
))
5369 if (put_user(num_idents
, &p
->shmac_num_idents
))
5371 if (copy_to_user(p
->shmac_idents
, hmacs
->hmac_ids
, data_len
))
5376 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5377 char __user
*optval
, int __user
*optlen
)
5379 struct net
*net
= sock_net(sk
);
5380 struct sctp_authkeyid val
;
5381 struct sctp_association
*asoc
;
5383 if (!net
->sctp
.auth_enable
)
5386 if (len
< sizeof(struct sctp_authkeyid
))
5388 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5391 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5392 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5396 val
.scact_keynumber
= asoc
->active_key_id
;
5398 val
.scact_keynumber
= sctp_sk(sk
)->ep
->active_key_id
;
5400 len
= sizeof(struct sctp_authkeyid
);
5401 if (put_user(len
, optlen
))
5403 if (copy_to_user(optval
, &val
, len
))
5409 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5410 char __user
*optval
, int __user
*optlen
)
5412 struct net
*net
= sock_net(sk
);
5413 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5414 struct sctp_authchunks val
;
5415 struct sctp_association
*asoc
;
5416 struct sctp_chunks_param
*ch
;
5420 if (!net
->sctp
.auth_enable
)
5423 if (len
< sizeof(struct sctp_authchunks
))
5426 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
5429 to
= p
->gauth_chunks
;
5430 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5434 ch
= asoc
->peer
.peer_chunks
;
5438 /* See if the user provided enough room for all the data */
5439 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5440 if (len
< num_chunks
)
5443 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
5446 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
5447 if (put_user(len
, optlen
)) return -EFAULT
;
5448 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5453 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
5454 char __user
*optval
, int __user
*optlen
)
5456 struct net
*net
= sock_net(sk
);
5457 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5458 struct sctp_authchunks val
;
5459 struct sctp_association
*asoc
;
5460 struct sctp_chunks_param
*ch
;
5464 if (!net
->sctp
.auth_enable
)
5467 if (len
< sizeof(struct sctp_authchunks
))
5470 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
5473 to
= p
->gauth_chunks
;
5474 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5475 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
5479 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
5481 ch
= sctp_sk(sk
)->ep
->auth_chunk_list
;
5486 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5487 if (len
< sizeof(struct sctp_authchunks
) + num_chunks
)
5490 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
5493 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
5494 if (put_user(len
, optlen
))
5496 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5503 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5504 * This option gets the current number of associations that are attached
5505 * to a one-to-many style socket. The option value is an uint32_t.
5507 static int sctp_getsockopt_assoc_number(struct sock
*sk
, int len
,
5508 char __user
*optval
, int __user
*optlen
)
5510 struct sctp_sock
*sp
= sctp_sk(sk
);
5511 struct sctp_association
*asoc
;
5514 if (sctp_style(sk
, TCP
))
5517 if (len
< sizeof(u32
))
5522 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5526 if (put_user(len
, optlen
))
5528 if (copy_to_user(optval
, &val
, len
))
5535 * 8.1.23 SCTP_AUTO_ASCONF
5536 * See the corresponding setsockopt entry as description
5538 static int sctp_getsockopt_auto_asconf(struct sock
*sk
, int len
,
5539 char __user
*optval
, int __user
*optlen
)
5543 if (len
< sizeof(int))
5547 if (sctp_sk(sk
)->do_auto_asconf
&& sctp_is_ep_boundall(sk
))
5549 if (put_user(len
, optlen
))
5551 if (copy_to_user(optval
, &val
, len
))
5557 * 8.2.6. Get the Current Identifiers of Associations
5558 * (SCTP_GET_ASSOC_ID_LIST)
5560 * This option gets the current list of SCTP association identifiers of
5561 * the SCTP associations handled by a one-to-many style socket.
5563 static int sctp_getsockopt_assoc_ids(struct sock
*sk
, int len
,
5564 char __user
*optval
, int __user
*optlen
)
5566 struct sctp_sock
*sp
= sctp_sk(sk
);
5567 struct sctp_association
*asoc
;
5568 struct sctp_assoc_ids
*ids
;
5571 if (sctp_style(sk
, TCP
))
5574 if (len
< sizeof(struct sctp_assoc_ids
))
5577 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5581 if (len
< sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
)
5584 len
= sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
;
5586 ids
= kmalloc(len
, GFP_KERNEL
);
5590 ids
->gaids_number_of_ids
= num
;
5592 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5593 ids
->gaids_assoc_id
[num
++] = asoc
->assoc_id
;
5596 if (put_user(len
, optlen
) || copy_to_user(optval
, ids
, len
)) {
5606 * SCTP_PEER_ADDR_THLDS
5608 * This option allows us to fetch the partially failed threshold for one or all
5609 * transports in an association. See Section 6.1 of:
5610 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5612 static int sctp_getsockopt_paddr_thresholds(struct sock
*sk
,
5613 char __user
*optval
,
5617 struct sctp_paddrthlds val
;
5618 struct sctp_transport
*trans
;
5619 struct sctp_association
*asoc
;
5621 if (len
< sizeof(struct sctp_paddrthlds
))
5623 len
= sizeof(struct sctp_paddrthlds
);
5624 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
, len
))
5627 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
5628 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
5632 val
.spt_pathpfthld
= asoc
->pf_retrans
;
5633 val
.spt_pathmaxrxt
= asoc
->pathmaxrxt
;
5635 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
5640 val
.spt_pathmaxrxt
= trans
->pathmaxrxt
;
5641 val
.spt_pathpfthld
= trans
->pf_retrans
;
5644 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
5651 * SCTP_GET_ASSOC_STATS
5653 * This option retrieves local per endpoint statistics. It is modeled
5654 * after OpenSolaris' implementation
5656 static int sctp_getsockopt_assoc_stats(struct sock
*sk
, int len
,
5657 char __user
*optval
,
5660 struct sctp_assoc_stats sas
;
5661 struct sctp_association
*asoc
= NULL
;
5663 /* User must provide at least the assoc id */
5664 if (len
< sizeof(sctp_assoc_t
))
5667 /* Allow the struct to grow and fill in as much as possible */
5668 len
= min_t(size_t, len
, sizeof(sas
));
5670 if (copy_from_user(&sas
, optval
, len
))
5673 asoc
= sctp_id2assoc(sk
, sas
.sas_assoc_id
);
5677 sas
.sas_rtxchunks
= asoc
->stats
.rtxchunks
;
5678 sas
.sas_gapcnt
= asoc
->stats
.gapcnt
;
5679 sas
.sas_outofseqtsns
= asoc
->stats
.outofseqtsns
;
5680 sas
.sas_osacks
= asoc
->stats
.osacks
;
5681 sas
.sas_isacks
= asoc
->stats
.isacks
;
5682 sas
.sas_octrlchunks
= asoc
->stats
.octrlchunks
;
5683 sas
.sas_ictrlchunks
= asoc
->stats
.ictrlchunks
;
5684 sas
.sas_oodchunks
= asoc
->stats
.oodchunks
;
5685 sas
.sas_iodchunks
= asoc
->stats
.iodchunks
;
5686 sas
.sas_ouodchunks
= asoc
->stats
.ouodchunks
;
5687 sas
.sas_iuodchunks
= asoc
->stats
.iuodchunks
;
5688 sas
.sas_idupchunks
= asoc
->stats
.idupchunks
;
5689 sas
.sas_opackets
= asoc
->stats
.opackets
;
5690 sas
.sas_ipackets
= asoc
->stats
.ipackets
;
5692 /* New high max rto observed, will return 0 if not a single
5693 * RTO update took place. obs_rto_ipaddr will be bogus
5696 sas
.sas_maxrto
= asoc
->stats
.max_obs_rto
;
5697 memcpy(&sas
.sas_obs_rto_ipaddr
, &asoc
->stats
.obs_rto_ipaddr
,
5698 sizeof(struct sockaddr_storage
));
5700 /* Mark beginning of a new observation period */
5701 asoc
->stats
.max_obs_rto
= asoc
->rto_min
;
5703 if (put_user(len
, optlen
))
5706 pr_debug("%s: len:%d, assoc_id:%d\n", __func__
, len
, sas
.sas_assoc_id
);
5708 if (copy_to_user(optval
, &sas
, len
))
5714 static int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
5715 char __user
*optval
, int __user
*optlen
)
5720 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
5722 /* I can hardly begin to describe how wrong this is. This is
5723 * so broken as to be worse than useless. The API draft
5724 * REALLY is NOT helpful here... I am not convinced that the
5725 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5726 * are at all well-founded.
5728 if (level
!= SOL_SCTP
) {
5729 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5731 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
5735 if (get_user(len
, optlen
))
5742 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
5744 case SCTP_DISABLE_FRAGMENTS
:
5745 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
5749 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
5751 case SCTP_AUTOCLOSE
:
5752 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
5754 case SCTP_SOCKOPT_PEELOFF
:
5755 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
5757 case SCTP_PEER_ADDR_PARAMS
:
5758 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
5761 case SCTP_DELAYED_SACK
:
5762 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
5766 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
5768 case SCTP_GET_PEER_ADDRS
:
5769 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
5772 case SCTP_GET_LOCAL_ADDRS
:
5773 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
5776 case SCTP_SOCKOPT_CONNECTX3
:
5777 retval
= sctp_getsockopt_connectx3(sk
, len
, optval
, optlen
);
5779 case SCTP_DEFAULT_SEND_PARAM
:
5780 retval
= sctp_getsockopt_default_send_param(sk
, len
,
5783 case SCTP_PRIMARY_ADDR
:
5784 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
5787 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
5790 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
5792 case SCTP_ASSOCINFO
:
5793 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
5795 case SCTP_I_WANT_MAPPED_V4_ADDR
:
5796 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
5799 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
5801 case SCTP_GET_PEER_ADDR_INFO
:
5802 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
5805 case SCTP_ADAPTATION_LAYER
:
5806 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
5810 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
5812 case SCTP_FRAGMENT_INTERLEAVE
:
5813 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
5816 case SCTP_PARTIAL_DELIVERY_POINT
:
5817 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
5820 case SCTP_MAX_BURST
:
5821 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
5824 case SCTP_AUTH_CHUNK
:
5825 case SCTP_AUTH_DELETE_KEY
:
5826 retval
= -EOPNOTSUPP
;
5828 case SCTP_HMAC_IDENT
:
5829 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
5831 case SCTP_AUTH_ACTIVE_KEY
:
5832 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
5834 case SCTP_PEER_AUTH_CHUNKS
:
5835 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
5838 case SCTP_LOCAL_AUTH_CHUNKS
:
5839 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
5842 case SCTP_GET_ASSOC_NUMBER
:
5843 retval
= sctp_getsockopt_assoc_number(sk
, len
, optval
, optlen
);
5845 case SCTP_GET_ASSOC_ID_LIST
:
5846 retval
= sctp_getsockopt_assoc_ids(sk
, len
, optval
, optlen
);
5848 case SCTP_AUTO_ASCONF
:
5849 retval
= sctp_getsockopt_auto_asconf(sk
, len
, optval
, optlen
);
5851 case SCTP_PEER_ADDR_THLDS
:
5852 retval
= sctp_getsockopt_paddr_thresholds(sk
, optval
, len
, optlen
);
5854 case SCTP_GET_ASSOC_STATS
:
5855 retval
= sctp_getsockopt_assoc_stats(sk
, len
, optval
, optlen
);
5858 retval
= -ENOPROTOOPT
;
5862 sctp_release_sock(sk
);
5866 static void sctp_hash(struct sock
*sk
)
5871 static void sctp_unhash(struct sock
*sk
)
5876 /* Check if port is acceptable. Possibly find first available port.
5878 * The port hash table (contained in the 'global' SCTP protocol storage
5879 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5880 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5881 * list (the list number is the port number hashed out, so as you
5882 * would expect from a hash function, all the ports in a given list have
5883 * such a number that hashes out to the same list number; you were
5884 * expecting that, right?); so each list has a set of ports, with a
5885 * link to the socket (struct sock) that uses it, the port number and
5886 * a fastreuse flag (FIXME: NPI ipg).
5888 static struct sctp_bind_bucket
*sctp_bucket_create(
5889 struct sctp_bind_hashbucket
*head
, struct net
*, unsigned short snum
);
5891 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
5893 struct sctp_bind_hashbucket
*head
; /* hash list */
5894 struct sctp_bind_bucket
*pp
;
5895 unsigned short snum
;
5898 snum
= ntohs(addr
->v4
.sin_port
);
5900 pr_debug("%s: begins, snum:%d\n", __func__
, snum
);
5902 sctp_local_bh_disable();
5905 /* Search for an available port. */
5906 int low
, high
, remaining
, index
;
5909 inet_get_local_port_range(sock_net(sk
), &low
, &high
);
5910 remaining
= (high
- low
) + 1;
5911 rover
= net_random() % remaining
+ low
;
5915 if ((rover
< low
) || (rover
> high
))
5917 if (inet_is_reserved_local_port(rover
))
5919 index
= sctp_phashfn(sock_net(sk
), rover
);
5920 head
= &sctp_port_hashtable
[index
];
5921 sctp_spin_lock(&head
->lock
);
5922 sctp_for_each_hentry(pp
, &head
->chain
)
5923 if ((pp
->port
== rover
) &&
5924 net_eq(sock_net(sk
), pp
->net
))
5928 sctp_spin_unlock(&head
->lock
);
5929 } while (--remaining
> 0);
5931 /* Exhausted local port range during search? */
5936 /* OK, here is the one we will use. HEAD (the port
5937 * hash table list entry) is non-NULL and we hold it's
5942 /* We are given an specific port number; we verify
5943 * that it is not being used. If it is used, we will
5944 * exahust the search in the hash list corresponding
5945 * to the port number (snum) - we detect that with the
5946 * port iterator, pp being NULL.
5948 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
), snum
)];
5949 sctp_spin_lock(&head
->lock
);
5950 sctp_for_each_hentry(pp
, &head
->chain
) {
5951 if ((pp
->port
== snum
) && net_eq(pp
->net
, sock_net(sk
)))
5958 if (!hlist_empty(&pp
->owner
)) {
5959 /* We had a port hash table hit - there is an
5960 * available port (pp != NULL) and it is being
5961 * used by other socket (pp->owner not empty); that other
5962 * socket is going to be sk2.
5964 int reuse
= sk
->sk_reuse
;
5967 pr_debug("%s: found a possible match\n", __func__
);
5969 if (pp
->fastreuse
&& sk
->sk_reuse
&&
5970 sk
->sk_state
!= SCTP_SS_LISTENING
)
5973 /* Run through the list of sockets bound to the port
5974 * (pp->port) [via the pointers bind_next and
5975 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5976 * we get the endpoint they describe and run through
5977 * the endpoint's list of IP (v4 or v6) addresses,
5978 * comparing each of the addresses with the address of
5979 * the socket sk. If we find a match, then that means
5980 * that this port/socket (sk) combination are already
5983 sk_for_each_bound(sk2
, &pp
->owner
) {
5984 struct sctp_endpoint
*ep2
;
5985 ep2
= sctp_sk(sk2
)->ep
;
5988 (reuse
&& sk2
->sk_reuse
&&
5989 sk2
->sk_state
!= SCTP_SS_LISTENING
))
5992 if (sctp_bind_addr_conflict(&ep2
->base
.bind_addr
, addr
,
5993 sctp_sk(sk2
), sctp_sk(sk
))) {
5999 pr_debug("%s: found a match\n", __func__
);
6002 /* If there was a hash table miss, create a new port. */
6004 if (!pp
&& !(pp
= sctp_bucket_create(head
, sock_net(sk
), snum
)))
6007 /* In either case (hit or miss), make sure fastreuse is 1 only
6008 * if sk->sk_reuse is too (that is, if the caller requested
6009 * SO_REUSEADDR on this socket -sk-).
6011 if (hlist_empty(&pp
->owner
)) {
6012 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
6016 } else if (pp
->fastreuse
&&
6017 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
6020 /* We are set, so fill up all the data in the hash table
6021 * entry, tie the socket list information with the rest of the
6022 * sockets FIXME: Blurry, NPI (ipg).
6025 if (!sctp_sk(sk
)->bind_hash
) {
6026 inet_sk(sk
)->inet_num
= snum
;
6027 sk_add_bind_node(sk
, &pp
->owner
);
6028 sctp_sk(sk
)->bind_hash
= pp
;
6033 sctp_spin_unlock(&head
->lock
);
6036 sctp_local_bh_enable();
6040 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6041 * port is requested.
6043 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
6045 union sctp_addr addr
;
6046 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
6048 /* Set up a dummy address struct from the sk. */
6049 af
->from_sk(&addr
, sk
);
6050 addr
.v4
.sin_port
= htons(snum
);
6052 /* Note: sk->sk_num gets filled in if ephemeral port request. */
6053 return !!sctp_get_port_local(sk
, &addr
);
6057 * Move a socket to LISTENING state.
6059 static int sctp_listen_start(struct sock
*sk
, int backlog
)
6061 struct sctp_sock
*sp
= sctp_sk(sk
);
6062 struct sctp_endpoint
*ep
= sp
->ep
;
6063 struct crypto_hash
*tfm
= NULL
;
6066 /* Allocate HMAC for generating cookie. */
6067 if (!sp
->hmac
&& sp
->sctp_hmac_alg
) {
6068 sprintf(alg
, "hmac(%s)", sp
->sctp_hmac_alg
);
6069 tfm
= crypto_alloc_hash(alg
, 0, CRYPTO_ALG_ASYNC
);
6071 net_info_ratelimited("failed to load transform for %s: %ld\n",
6072 sp
->sctp_hmac_alg
, PTR_ERR(tfm
));
6075 sctp_sk(sk
)->hmac
= tfm
;
6079 * If a bind() or sctp_bindx() is not called prior to a listen()
6080 * call that allows new associations to be accepted, the system
6081 * picks an ephemeral port and will choose an address set equivalent
6082 * to binding with a wildcard address.
6084 * This is not currently spelled out in the SCTP sockets
6085 * extensions draft, but follows the practice as seen in TCP
6089 sk
->sk_state
= SCTP_SS_LISTENING
;
6090 if (!ep
->base
.bind_addr
.port
) {
6091 if (sctp_autobind(sk
))
6094 if (sctp_get_port(sk
, inet_sk(sk
)->inet_num
)) {
6095 sk
->sk_state
= SCTP_SS_CLOSED
;
6100 sk
->sk_max_ack_backlog
= backlog
;
6101 sctp_hash_endpoint(ep
);
6106 * 4.1.3 / 5.1.3 listen()
6108 * By default, new associations are not accepted for UDP style sockets.
6109 * An application uses listen() to mark a socket as being able to
6110 * accept new associations.
6112 * On TCP style sockets, applications use listen() to ready the SCTP
6113 * endpoint for accepting inbound associations.
6115 * On both types of endpoints a backlog of '0' disables listening.
6117 * Move a socket to LISTENING state.
6119 int sctp_inet_listen(struct socket
*sock
, int backlog
)
6121 struct sock
*sk
= sock
->sk
;
6122 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6125 if (unlikely(backlog
< 0))
6130 /* Peeled-off sockets are not allowed to listen(). */
6131 if (sctp_style(sk
, UDP_HIGH_BANDWIDTH
))
6134 if (sock
->state
!= SS_UNCONNECTED
)
6137 /* If backlog is zero, disable listening. */
6139 if (sctp_sstate(sk
, CLOSED
))
6143 sctp_unhash_endpoint(ep
);
6144 sk
->sk_state
= SCTP_SS_CLOSED
;
6146 sctp_sk(sk
)->bind_hash
->fastreuse
= 1;
6150 /* If we are already listening, just update the backlog */
6151 if (sctp_sstate(sk
, LISTENING
))
6152 sk
->sk_max_ack_backlog
= backlog
;
6154 err
= sctp_listen_start(sk
, backlog
);
6161 sctp_release_sock(sk
);
6166 * This function is done by modeling the current datagram_poll() and the
6167 * tcp_poll(). Note that, based on these implementations, we don't
6168 * lock the socket in this function, even though it seems that,
6169 * ideally, locking or some other mechanisms can be used to ensure
6170 * the integrity of the counters (sndbuf and wmem_alloc) used
6171 * in this place. We assume that we don't need locks either until proven
6174 * Another thing to note is that we include the Async I/O support
6175 * here, again, by modeling the current TCP/UDP code. We don't have
6176 * a good way to test with it yet.
6178 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
6180 struct sock
*sk
= sock
->sk
;
6181 struct sctp_sock
*sp
= sctp_sk(sk
);
6184 poll_wait(file
, sk_sleep(sk
), wait
);
6186 /* A TCP-style listening socket becomes readable when the accept queue
6189 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
6190 return (!list_empty(&sp
->ep
->asocs
)) ?
6191 (POLLIN
| POLLRDNORM
) : 0;
6195 /* Is there any exceptional events? */
6196 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
6198 (sock_flag(sk
, SOCK_SELECT_ERR_QUEUE
) ? POLLPRI
: 0);
6199 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6200 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
6201 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
6204 /* Is it readable? Reconsider this code with TCP-style support. */
6205 if (!skb_queue_empty(&sk
->sk_receive_queue
))
6206 mask
|= POLLIN
| POLLRDNORM
;
6208 /* The association is either gone or not ready. */
6209 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
6212 /* Is it writable? */
6213 if (sctp_writeable(sk
)) {
6214 mask
|= POLLOUT
| POLLWRNORM
;
6216 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
6218 * Since the socket is not locked, the buffer
6219 * might be made available after the writeable check and
6220 * before the bit is set. This could cause a lost I/O
6221 * signal. tcp_poll() has a race breaker for this race
6222 * condition. Based on their implementation, we put
6223 * in the following code to cover it as well.
6225 if (sctp_writeable(sk
))
6226 mask
|= POLLOUT
| POLLWRNORM
;
6231 /********************************************************************
6232 * 2nd Level Abstractions
6233 ********************************************************************/
6235 static struct sctp_bind_bucket
*sctp_bucket_create(
6236 struct sctp_bind_hashbucket
*head
, struct net
*net
, unsigned short snum
)
6238 struct sctp_bind_bucket
*pp
;
6240 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
6242 SCTP_DBG_OBJCNT_INC(bind_bucket
);
6245 INIT_HLIST_HEAD(&pp
->owner
);
6247 hlist_add_head(&pp
->node
, &head
->chain
);
6252 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6253 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
6255 if (pp
&& hlist_empty(&pp
->owner
)) {
6256 __hlist_del(&pp
->node
);
6257 kmem_cache_free(sctp_bucket_cachep
, pp
);
6258 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
6262 /* Release this socket's reference to a local port. */
6263 static inline void __sctp_put_port(struct sock
*sk
)
6265 struct sctp_bind_hashbucket
*head
=
6266 &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
),
6267 inet_sk(sk
)->inet_num
)];
6268 struct sctp_bind_bucket
*pp
;
6270 sctp_spin_lock(&head
->lock
);
6271 pp
= sctp_sk(sk
)->bind_hash
;
6272 __sk_del_bind_node(sk
);
6273 sctp_sk(sk
)->bind_hash
= NULL
;
6274 inet_sk(sk
)->inet_num
= 0;
6275 sctp_bucket_destroy(pp
);
6276 sctp_spin_unlock(&head
->lock
);
6279 void sctp_put_port(struct sock
*sk
)
6281 sctp_local_bh_disable();
6282 __sctp_put_port(sk
);
6283 sctp_local_bh_enable();
6287 * The system picks an ephemeral port and choose an address set equivalent
6288 * to binding with a wildcard address.
6289 * One of those addresses will be the primary address for the association.
6290 * This automatically enables the multihoming capability of SCTP.
6292 static int sctp_autobind(struct sock
*sk
)
6294 union sctp_addr autoaddr
;
6298 /* Initialize a local sockaddr structure to INADDR_ANY. */
6299 af
= sctp_sk(sk
)->pf
->af
;
6301 port
= htons(inet_sk(sk
)->inet_num
);
6302 af
->inaddr_any(&autoaddr
, port
);
6304 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
6307 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6310 * 4.2 The cmsghdr Structure *
6312 * When ancillary data is sent or received, any number of ancillary data
6313 * objects can be specified by the msg_control and msg_controllen members of
6314 * the msghdr structure, because each object is preceded by
6315 * a cmsghdr structure defining the object's length (the cmsg_len member).
6316 * Historically Berkeley-derived implementations have passed only one object
6317 * at a time, but this API allows multiple objects to be
6318 * passed in a single call to sendmsg() or recvmsg(). The following example
6319 * shows two ancillary data objects in a control buffer.
6321 * |<--------------------------- msg_controllen -------------------------->|
6324 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6326 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6329 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6331 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6334 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6335 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6337 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6339 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6346 static int sctp_msghdr_parse(const struct msghdr
*msg
, sctp_cmsgs_t
*cmsgs
)
6348 struct cmsghdr
*cmsg
;
6349 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
6351 for (cmsg
= CMSG_FIRSTHDR(msg
);
6353 cmsg
= CMSG_NXTHDR(my_msg
, cmsg
)) {
6354 if (!CMSG_OK(my_msg
, cmsg
))
6357 /* Should we parse this header or ignore? */
6358 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
6361 /* Strictly check lengths following example in SCM code. */
6362 switch (cmsg
->cmsg_type
) {
6364 /* SCTP Socket API Extension
6365 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
6367 * This cmsghdr structure provides information for
6368 * initializing new SCTP associations with sendmsg().
6369 * The SCTP_INITMSG socket option uses this same data
6370 * structure. This structure is not used for
6373 * cmsg_level cmsg_type cmsg_data[]
6374 * ------------ ------------ ----------------------
6375 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6377 if (cmsg
->cmsg_len
!=
6378 CMSG_LEN(sizeof(struct sctp_initmsg
)))
6380 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
6384 /* SCTP Socket API Extension
6385 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6387 * This cmsghdr structure specifies SCTP options for
6388 * sendmsg() and describes SCTP header information
6389 * about a received message through recvmsg().
6391 * cmsg_level cmsg_type cmsg_data[]
6392 * ------------ ------------ ----------------------
6393 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6395 if (cmsg
->cmsg_len
!=
6396 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
6400 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
6402 /* Minimally, validate the sinfo_flags. */
6403 if (cmsgs
->info
->sinfo_flags
&
6404 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
6405 SCTP_ABORT
| SCTP_EOF
))
6417 * Wait for a packet..
6418 * Note: This function is the same function as in core/datagram.c
6419 * with a few modifications to make lksctp work.
6421 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
6426 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
6428 /* Socket errors? */
6429 error
= sock_error(sk
);
6433 if (!skb_queue_empty(&sk
->sk_receive_queue
))
6436 /* Socket shut down? */
6437 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6440 /* Sequenced packets can come disconnected. If so we report the
6445 /* Is there a good reason to think that we may receive some data? */
6446 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
6449 /* Handle signals. */
6450 if (signal_pending(current
))
6453 /* Let another process have a go. Since we are going to sleep
6454 * anyway. Note: This may cause odd behaviors if the message
6455 * does not fit in the user's buffer, but this seems to be the
6456 * only way to honor MSG_DONTWAIT realistically.
6458 sctp_release_sock(sk
);
6459 *timeo_p
= schedule_timeout(*timeo_p
);
6463 finish_wait(sk_sleep(sk
), &wait
);
6467 error
= sock_intr_errno(*timeo_p
);
6470 finish_wait(sk_sleep(sk
), &wait
);
6475 /* Receive a datagram.
6476 * Note: This is pretty much the same routine as in core/datagram.c
6477 * with a few changes to make lksctp work.
6479 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
6480 int noblock
, int *err
)
6483 struct sk_buff
*skb
;
6486 timeo
= sock_rcvtimeo(sk
, noblock
);
6488 pr_debug("%s: timeo:%ld, max:%ld\n", __func__
, timeo
,
6489 MAX_SCHEDULE_TIMEOUT
);
6492 /* Again only user level code calls this function,
6493 * so nothing interrupt level
6494 * will suddenly eat the receive_queue.
6496 * Look at current nfs client by the way...
6497 * However, this function was correct in any case. 8)
6499 if (flags
& MSG_PEEK
) {
6500 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
6501 skb
= skb_peek(&sk
->sk_receive_queue
);
6503 atomic_inc(&skb
->users
);
6504 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
6506 skb
= skb_dequeue(&sk
->sk_receive_queue
);
6512 /* Caller is allowed not to check sk->sk_err before calling. */
6513 error
= sock_error(sk
);
6517 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6520 /* User doesn't want to wait. */
6524 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
6533 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6534 static void __sctp_write_space(struct sctp_association
*asoc
)
6536 struct sock
*sk
= asoc
->base
.sk
;
6537 struct socket
*sock
= sk
->sk_socket
;
6539 if ((sctp_wspace(asoc
) > 0) && sock
) {
6540 if (waitqueue_active(&asoc
->wait
))
6541 wake_up_interruptible(&asoc
->wait
);
6543 if (sctp_writeable(sk
)) {
6544 wait_queue_head_t
*wq
= sk_sleep(sk
);
6546 if (wq
&& waitqueue_active(wq
))
6547 wake_up_interruptible(wq
);
6549 /* Note that we try to include the Async I/O support
6550 * here by modeling from the current TCP/UDP code.
6551 * We have not tested with it yet.
6553 if (!(sk
->sk_shutdown
& SEND_SHUTDOWN
))
6554 sock_wake_async(sock
,
6555 SOCK_WAKE_SPACE
, POLL_OUT
);
6560 /* Do accounting for the sndbuf space.
6561 * Decrement the used sndbuf space of the corresponding association by the
6562 * data size which was just transmitted(freed).
6564 static void sctp_wfree(struct sk_buff
*skb
)
6566 struct sctp_association
*asoc
;
6567 struct sctp_chunk
*chunk
;
6570 /* Get the saved chunk pointer. */
6571 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
6574 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
6575 sizeof(struct sk_buff
) +
6576 sizeof(struct sctp_chunk
);
6578 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
6581 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6583 sk
->sk_wmem_queued
-= skb
->truesize
;
6584 sk_mem_uncharge(sk
, skb
->truesize
);
6587 __sctp_write_space(asoc
);
6589 sctp_association_put(asoc
);
6592 /* Do accounting for the receive space on the socket.
6593 * Accounting for the association is done in ulpevent.c
6594 * We set this as a destructor for the cloned data skbs so that
6595 * accounting is done at the correct time.
6597 void sctp_sock_rfree(struct sk_buff
*skb
)
6599 struct sock
*sk
= skb
->sk
;
6600 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
6602 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
6605 * Mimic the behavior of sock_rfree
6607 sk_mem_uncharge(sk
, event
->rmem_len
);
6611 /* Helper function to wait for space in the sndbuf. */
6612 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
6615 struct sock
*sk
= asoc
->base
.sk
;
6617 long current_timeo
= *timeo_p
;
6620 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__
, asoc
,
6623 /* Increment the association's refcnt. */
6624 sctp_association_hold(asoc
);
6626 /* Wait on the association specific sndbuf space. */
6628 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6629 TASK_INTERRUPTIBLE
);
6632 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6635 if (signal_pending(current
))
6636 goto do_interrupted
;
6637 if (msg_len
<= sctp_wspace(asoc
))
6640 /* Let another process have a go. Since we are going
6643 sctp_release_sock(sk
);
6644 current_timeo
= schedule_timeout(current_timeo
);
6645 BUG_ON(sk
!= asoc
->base
.sk
);
6648 *timeo_p
= current_timeo
;
6652 finish_wait(&asoc
->wait
, &wait
);
6654 /* Release the association's refcnt. */
6655 sctp_association_put(asoc
);
6664 err
= sock_intr_errno(*timeo_p
);
6672 void sctp_data_ready(struct sock
*sk
, int len
)
6674 struct socket_wq
*wq
;
6677 wq
= rcu_dereference(sk
->sk_wq
);
6678 if (wq_has_sleeper(wq
))
6679 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
6680 POLLRDNORM
| POLLRDBAND
);
6681 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
6685 /* If socket sndbuf has changed, wake up all per association waiters. */
6686 void sctp_write_space(struct sock
*sk
)
6688 struct sctp_association
*asoc
;
6690 /* Wake up the tasks in each wait queue. */
6691 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
6692 __sctp_write_space(asoc
);
6696 /* Is there any sndbuf space available on the socket?
6698 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6699 * associations on the same socket. For a UDP-style socket with
6700 * multiple associations, it is possible for it to be "unwriteable"
6701 * prematurely. I assume that this is acceptable because
6702 * a premature "unwriteable" is better than an accidental "writeable" which
6703 * would cause an unwanted block under certain circumstances. For the 1-1
6704 * UDP-style sockets or TCP-style sockets, this code should work.
6707 static int sctp_writeable(struct sock
*sk
)
6711 amt
= sk
->sk_sndbuf
- sk_wmem_alloc_get(sk
);
6717 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6718 * returns immediately with EINPROGRESS.
6720 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
6722 struct sock
*sk
= asoc
->base
.sk
;
6724 long current_timeo
= *timeo_p
;
6727 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__
, asoc
, *timeo_p
);
6729 /* Increment the association's refcnt. */
6730 sctp_association_hold(asoc
);
6733 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6734 TASK_INTERRUPTIBLE
);
6737 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6739 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6742 if (signal_pending(current
))
6743 goto do_interrupted
;
6745 if (sctp_state(asoc
, ESTABLISHED
))
6748 /* Let another process have a go. Since we are going
6751 sctp_release_sock(sk
);
6752 current_timeo
= schedule_timeout(current_timeo
);
6755 *timeo_p
= current_timeo
;
6759 finish_wait(&asoc
->wait
, &wait
);
6761 /* Release the association's refcnt. */
6762 sctp_association_put(asoc
);
6767 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
6770 err
= -ECONNREFUSED
;
6774 err
= sock_intr_errno(*timeo_p
);
6782 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
6784 struct sctp_endpoint
*ep
;
6788 ep
= sctp_sk(sk
)->ep
;
6792 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
6793 TASK_INTERRUPTIBLE
);
6795 if (list_empty(&ep
->asocs
)) {
6796 sctp_release_sock(sk
);
6797 timeo
= schedule_timeout(timeo
);
6802 if (!sctp_sstate(sk
, LISTENING
))
6806 if (!list_empty(&ep
->asocs
))
6809 err
= sock_intr_errno(timeo
);
6810 if (signal_pending(current
))
6818 finish_wait(sk_sleep(sk
), &wait
);
6823 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
6828 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
6829 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
6831 sctp_release_sock(sk
);
6832 timeout
= schedule_timeout(timeout
);
6834 } while (!signal_pending(current
) && timeout
);
6836 finish_wait(sk_sleep(sk
), &wait
);
6839 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
6841 struct sk_buff
*frag
;
6846 /* Don't forget the fragments. */
6847 skb_walk_frags(skb
, frag
)
6848 sctp_skb_set_owner_r_frag(frag
, sk
);
6851 sctp_skb_set_owner_r(skb
, sk
);
6854 void sctp_copy_sock(struct sock
*newsk
, struct sock
*sk
,
6855 struct sctp_association
*asoc
)
6857 struct inet_sock
*inet
= inet_sk(sk
);
6858 struct inet_sock
*newinet
;
6860 newsk
->sk_type
= sk
->sk_type
;
6861 newsk
->sk_bound_dev_if
= sk
->sk_bound_dev_if
;
6862 newsk
->sk_flags
= sk
->sk_flags
;
6863 newsk
->sk_no_check
= sk
->sk_no_check
;
6864 newsk
->sk_reuse
= sk
->sk_reuse
;
6866 newsk
->sk_shutdown
= sk
->sk_shutdown
;
6867 newsk
->sk_destruct
= sctp_destruct_sock
;
6868 newsk
->sk_family
= sk
->sk_family
;
6869 newsk
->sk_protocol
= IPPROTO_SCTP
;
6870 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
6871 newsk
->sk_sndbuf
= sk
->sk_sndbuf
;
6872 newsk
->sk_rcvbuf
= sk
->sk_rcvbuf
;
6873 newsk
->sk_lingertime
= sk
->sk_lingertime
;
6874 newsk
->sk_rcvtimeo
= sk
->sk_rcvtimeo
;
6875 newsk
->sk_sndtimeo
= sk
->sk_sndtimeo
;
6877 newinet
= inet_sk(newsk
);
6879 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6880 * getsockname() and getpeername()
6882 newinet
->inet_sport
= inet
->inet_sport
;
6883 newinet
->inet_saddr
= inet
->inet_saddr
;
6884 newinet
->inet_rcv_saddr
= inet
->inet_rcv_saddr
;
6885 newinet
->inet_dport
= htons(asoc
->peer
.port
);
6886 newinet
->pmtudisc
= inet
->pmtudisc
;
6887 newinet
->inet_id
= asoc
->next_tsn
^ jiffies
;
6889 newinet
->uc_ttl
= inet
->uc_ttl
;
6890 newinet
->mc_loop
= 1;
6891 newinet
->mc_ttl
= 1;
6892 newinet
->mc_index
= 0;
6893 newinet
->mc_list
= NULL
;
6896 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6897 * and its messages to the newsk.
6899 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
6900 struct sctp_association
*assoc
,
6901 sctp_socket_type_t type
)
6903 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
6904 struct sctp_sock
*newsp
= sctp_sk(newsk
);
6905 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
6906 struct sctp_endpoint
*newep
= newsp
->ep
;
6907 struct sk_buff
*skb
, *tmp
;
6908 struct sctp_ulpevent
*event
;
6909 struct sctp_bind_hashbucket
*head
;
6910 struct list_head tmplist
;
6912 /* Migrate socket buffer sizes and all the socket level options to the
6915 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
6916 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
6917 /* Brute force copy old sctp opt. */
6918 if (oldsp
->do_auto_asconf
) {
6919 memcpy(&tmplist
, &newsp
->auto_asconf_list
, sizeof(tmplist
));
6920 inet_sk_copy_descendant(newsk
, oldsk
);
6921 memcpy(&newsp
->auto_asconf_list
, &tmplist
, sizeof(tmplist
));
6923 inet_sk_copy_descendant(newsk
, oldsk
);
6925 /* Restore the ep value that was overwritten with the above structure
6931 /* Hook this new socket in to the bind_hash list. */
6932 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(oldsk
),
6933 inet_sk(oldsk
)->inet_num
)];
6934 sctp_local_bh_disable();
6935 sctp_spin_lock(&head
->lock
);
6936 pp
= sctp_sk(oldsk
)->bind_hash
;
6937 sk_add_bind_node(newsk
, &pp
->owner
);
6938 sctp_sk(newsk
)->bind_hash
= pp
;
6939 inet_sk(newsk
)->inet_num
= inet_sk(oldsk
)->inet_num
;
6940 sctp_spin_unlock(&head
->lock
);
6941 sctp_local_bh_enable();
6943 /* Copy the bind_addr list from the original endpoint to the new
6944 * endpoint so that we can handle restarts properly
6946 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
6947 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
6949 /* Move any messages in the old socket's receive queue that are for the
6950 * peeled off association to the new socket's receive queue.
6952 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
6953 event
= sctp_skb2event(skb
);
6954 if (event
->asoc
== assoc
) {
6955 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
6956 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
6957 sctp_skb_set_owner_r_frag(skb
, newsk
);
6961 /* Clean up any messages pending delivery due to partial
6962 * delivery. Three cases:
6963 * 1) No partial deliver; no work.
6964 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6965 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6967 skb_queue_head_init(&newsp
->pd_lobby
);
6968 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
6970 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
6971 struct sk_buff_head
*queue
;
6973 /* Decide which queue to move pd_lobby skbs to. */
6974 if (assoc
->ulpq
.pd_mode
) {
6975 queue
= &newsp
->pd_lobby
;
6977 queue
= &newsk
->sk_receive_queue
;
6979 /* Walk through the pd_lobby, looking for skbs that
6980 * need moved to the new socket.
6982 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6983 event
= sctp_skb2event(skb
);
6984 if (event
->asoc
== assoc
) {
6985 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6986 __skb_queue_tail(queue
, skb
);
6987 sctp_skb_set_owner_r_frag(skb
, newsk
);
6991 /* Clear up any skbs waiting for the partial
6992 * delivery to finish.
6994 if (assoc
->ulpq
.pd_mode
)
6995 sctp_clear_pd(oldsk
, NULL
);
6999 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
)
7000 sctp_skb_set_owner_r_frag(skb
, newsk
);
7002 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
)
7003 sctp_skb_set_owner_r_frag(skb
, newsk
);
7005 /* Set the type of socket to indicate that it is peeled off from the
7006 * original UDP-style socket or created with the accept() call on a
7007 * TCP-style socket..
7011 /* Mark the new socket "in-use" by the user so that any packets
7012 * that may arrive on the association after we've moved it are
7013 * queued to the backlog. This prevents a potential race between
7014 * backlog processing on the old socket and new-packet processing
7015 * on the new socket.
7017 * The caller has just allocated newsk so we can guarantee that other
7018 * paths won't try to lock it and then oldsk.
7020 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
7021 sctp_assoc_migrate(assoc
, newsk
);
7023 /* If the association on the newsk is already closed before accept()
7024 * is called, set RCV_SHUTDOWN flag.
7026 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
7027 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
7029 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
7030 sctp_release_sock(newsk
);
7034 /* This proto struct describes the ULP interface for SCTP. */
7035 struct proto sctp_prot
= {
7037 .owner
= THIS_MODULE
,
7038 .close
= sctp_close
,
7039 .connect
= sctp_connect
,
7040 .disconnect
= sctp_disconnect
,
7041 .accept
= sctp_accept
,
7042 .ioctl
= sctp_ioctl
,
7043 .init
= sctp_init_sock
,
7044 .destroy
= sctp_destroy_sock
,
7045 .shutdown
= sctp_shutdown
,
7046 .setsockopt
= sctp_setsockopt
,
7047 .getsockopt
= sctp_getsockopt
,
7048 .sendmsg
= sctp_sendmsg
,
7049 .recvmsg
= sctp_recvmsg
,
7051 .backlog_rcv
= sctp_backlog_rcv
,
7053 .unhash
= sctp_unhash
,
7054 .get_port
= sctp_get_port
,
7055 .obj_size
= sizeof(struct sctp_sock
),
7056 .sysctl_mem
= sysctl_sctp_mem
,
7057 .sysctl_rmem
= sysctl_sctp_rmem
,
7058 .sysctl_wmem
= sysctl_sctp_wmem
,
7059 .memory_pressure
= &sctp_memory_pressure
,
7060 .enter_memory_pressure
= sctp_enter_memory_pressure
,
7061 .memory_allocated
= &sctp_memory_allocated
,
7062 .sockets_allocated
= &sctp_sockets_allocated
,
7065 #if IS_ENABLED(CONFIG_IPV6)
7067 struct proto sctpv6_prot
= {
7069 .owner
= THIS_MODULE
,
7070 .close
= sctp_close
,
7071 .connect
= sctp_connect
,
7072 .disconnect
= sctp_disconnect
,
7073 .accept
= sctp_accept
,
7074 .ioctl
= sctp_ioctl
,
7075 .init
= sctp_init_sock
,
7076 .destroy
= sctp_destroy_sock
,
7077 .shutdown
= sctp_shutdown
,
7078 .setsockopt
= sctp_setsockopt
,
7079 .getsockopt
= sctp_getsockopt
,
7080 .sendmsg
= sctp_sendmsg
,
7081 .recvmsg
= sctp_recvmsg
,
7083 .backlog_rcv
= sctp_backlog_rcv
,
7085 .unhash
= sctp_unhash
,
7086 .get_port
= sctp_get_port
,
7087 .obj_size
= sizeof(struct sctp6_sock
),
7088 .sysctl_mem
= sysctl_sctp_mem
,
7089 .sysctl_rmem
= sysctl_sctp_rmem
,
7090 .sysctl_wmem
= sysctl_sctp_wmem
,
7091 .memory_pressure
= &sctp_memory_pressure
,
7092 .enter_memory_pressure
= sctp_enter_memory_pressure
,
7093 .memory_allocated
= &sctp_memory_allocated
,
7094 .sockets_allocated
= &sctp_sockets_allocated
,
7096 #endif /* IS_ENABLED(CONFIG_IPV6) */