1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
18 * This SCTP implementation is free software;
19 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
24 * This SCTP implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, see
32 * <http://www.gnu.org/licenses/>.
34 * Please send any bug reports or fixes you make to the
36 * lksctp developers <linux-sctp@vger.kernel.org>
38 * Written or modified by:
39 * La Monte H.P. Yarroll <piggy@acm.org>
40 * Narasimha Budihal <narsi@refcode.org>
41 * Karl Knutson <karl@athena.chicago.il.us>
42 * Jon Grimm <jgrimm@us.ibm.com>
43 * Xingang Guo <xingang.guo@intel.com>
44 * Daisy Chang <daisyc@us.ibm.com>
45 * Sridhar Samudrala <samudrala@us.ibm.com>
46 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
47 * Ardelle Fan <ardelle.fan@intel.com>
48 * Ryan Layer <rmlayer@us.ibm.com>
49 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
50 * Kevin Gao <kevin.gao@intel.com>
53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
55 #include <linux/types.h>
56 #include <linux/kernel.h>
57 #include <linux/wait.h>
58 #include <linux/time.h>
60 #include <linux/capability.h>
61 #include <linux/fcntl.h>
62 #include <linux/poll.h>
63 #include <linux/init.h>
64 #include <linux/crypto.h>
65 #include <linux/slab.h>
66 #include <linux/file.h>
70 #include <net/route.h>
72 #include <net/inet_common.h>
74 #include <linux/socket.h> /* for sa_family_t */
75 #include <linux/export.h>
77 #include <net/sctp/sctp.h>
78 #include <net/sctp/sm.h>
80 /* Forward declarations for internal helper functions. */
81 static int sctp_writeable(struct sock
*sk
);
82 static void sctp_wfree(struct sk_buff
*skb
);
83 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
85 static int sctp_wait_for_packet(struct sock
*sk
, int *err
, long *timeo_p
);
86 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
87 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
88 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
89 static void sctp_destruct_sock(struct sock
*sk
);
90 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
91 union sctp_addr
*addr
, int len
);
92 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
93 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
94 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
95 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
96 static int sctp_send_asconf(struct sctp_association
*asoc
,
97 struct sctp_chunk
*chunk
);
98 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
99 static int sctp_autobind(struct sock
*sk
);
100 static void sctp_sock_migrate(struct sock
*, struct sock
*,
101 struct sctp_association
*, sctp_socket_type_t
);
103 extern struct kmem_cache
*sctp_bucket_cachep
;
104 extern long sysctl_sctp_mem
[3];
105 extern int sysctl_sctp_rmem
[3];
106 extern int sysctl_sctp_wmem
[3];
108 static int sctp_memory_pressure
;
109 static atomic_long_t sctp_memory_allocated
;
110 struct percpu_counter sctp_sockets_allocated
;
112 static void sctp_enter_memory_pressure(struct sock
*sk
)
114 sctp_memory_pressure
= 1;
118 /* Get the sndbuf space available at the time on the association. */
119 static inline int sctp_wspace(struct sctp_association
*asoc
)
123 if (asoc
->ep
->sndbuf_policy
)
124 amt
= asoc
->sndbuf_used
;
126 amt
= sk_wmem_alloc_get(asoc
->base
.sk
);
128 if (amt
>= asoc
->base
.sk
->sk_sndbuf
) {
129 if (asoc
->base
.sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)
132 amt
= sk_stream_wspace(asoc
->base
.sk
);
137 amt
= asoc
->base
.sk
->sk_sndbuf
- amt
;
142 /* Increment the used sndbuf space count of the corresponding association by
143 * the size of the outgoing data chunk.
144 * Also, set the skb destructor for sndbuf accounting later.
146 * Since it is always 1-1 between chunk and skb, and also a new skb is always
147 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
148 * destructor in the data chunk skb for the purpose of the sndbuf space
151 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
153 struct sctp_association
*asoc
= chunk
->asoc
;
154 struct sock
*sk
= asoc
->base
.sk
;
156 /* The sndbuf space is tracked per association. */
157 sctp_association_hold(asoc
);
159 skb_set_owner_w(chunk
->skb
, sk
);
161 chunk
->skb
->destructor
= sctp_wfree
;
162 /* Save the chunk pointer in skb for sctp_wfree to use later. */
163 *((struct sctp_chunk
**)(chunk
->skb
->cb
)) = chunk
;
165 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
166 sizeof(struct sk_buff
) +
167 sizeof(struct sctp_chunk
);
169 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
170 sk
->sk_wmem_queued
+= chunk
->skb
->truesize
;
171 sk_mem_charge(sk
, chunk
->skb
->truesize
);
174 /* Verify that this is a valid address. */
175 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
180 /* Verify basic sockaddr. */
181 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
185 /* Is this a valid SCTP address? */
186 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
189 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
195 /* Look up the association by its id. If this is not a UDP-style
196 * socket, the ID field is always ignored.
198 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
200 struct sctp_association
*asoc
= NULL
;
202 /* If this is not a UDP-style socket, assoc id should be ignored. */
203 if (!sctp_style(sk
, UDP
)) {
204 /* Return NULL if the socket state is not ESTABLISHED. It
205 * could be a TCP-style listening socket or a socket which
206 * hasn't yet called connect() to establish an association.
208 if (!sctp_sstate(sk
, ESTABLISHED
))
211 /* Get the first and the only association from the list. */
212 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
213 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
214 struct sctp_association
, asocs
);
218 /* Otherwise this is a UDP-style socket. */
219 if (!id
|| (id
== (sctp_assoc_t
)-1))
222 spin_lock_bh(&sctp_assocs_id_lock
);
223 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
224 spin_unlock_bh(&sctp_assocs_id_lock
);
226 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
232 /* Look up the transport from an address and an assoc id. If both address and
233 * id are specified, the associations matching the address and the id should be
236 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
237 struct sockaddr_storage
*addr
,
240 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
241 struct sctp_transport
*transport
;
242 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
244 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
251 id_asoc
= sctp_id2assoc(sk
, id
);
252 if (id_asoc
&& (id_asoc
!= addr_asoc
))
255 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
256 (union sctp_addr
*)addr
);
261 /* API 3.1.2 bind() - UDP Style Syntax
262 * The syntax of bind() is,
264 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
266 * sd - the socket descriptor returned by socket().
267 * addr - the address structure (struct sockaddr_in or struct
268 * sockaddr_in6 [RFC 2553]),
269 * addr_len - the size of the address structure.
271 static int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
277 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__
, sk
,
280 /* Disallow binding twice. */
281 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
282 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
287 sctp_release_sock(sk
);
292 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
294 /* Verify this is a valid sockaddr. */
295 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
296 union sctp_addr
*addr
, int len
)
300 /* Check minimum size. */
301 if (len
< sizeof (struct sockaddr
))
304 /* V4 mapped address are really of AF_INET family */
305 if (addr
->sa
.sa_family
== AF_INET6
&&
306 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
)) {
307 if (!opt
->pf
->af_supported(AF_INET
, opt
))
310 /* Does this PF support this AF? */
311 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
315 /* If we get this far, af is valid. */
316 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
318 if (len
< af
->sockaddr_len
)
324 /* Bind a local address either to an endpoint or to an association. */
325 static int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
327 struct net
*net
= sock_net(sk
);
328 struct sctp_sock
*sp
= sctp_sk(sk
);
329 struct sctp_endpoint
*ep
= sp
->ep
;
330 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
335 /* Common sockaddr verification. */
336 af
= sctp_sockaddr_af(sp
, addr
, len
);
338 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
339 __func__
, sk
, addr
, len
);
343 snum
= ntohs(addr
->v4
.sin_port
);
345 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
346 __func__
, sk
, &addr
->sa
, bp
->port
, snum
, len
);
348 /* PF specific bind() address verification. */
349 if (!sp
->pf
->bind_verify(sp
, addr
))
350 return -EADDRNOTAVAIL
;
352 /* We must either be unbound, or bind to the same port.
353 * It's OK to allow 0 ports if we are already bound.
354 * We'll just inhert an already bound port in this case
359 else if (snum
!= bp
->port
) {
360 pr_debug("%s: new port %d doesn't match existing port "
361 "%d\n", __func__
, snum
, bp
->port
);
366 if (snum
&& snum
< PROT_SOCK
&&
367 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
))
370 /* See if the address matches any of the addresses we may have
371 * already bound before checking against other endpoints.
373 if (sctp_bind_addr_match(bp
, addr
, sp
))
376 /* Make sure we are allowed to bind here.
377 * The function sctp_get_port_local() does duplicate address
380 addr
->v4
.sin_port
= htons(snum
);
381 if ((ret
= sctp_get_port_local(sk
, addr
))) {
385 /* Refresh ephemeral port. */
387 bp
->port
= inet_sk(sk
)->inet_num
;
389 /* Add the address to the bind address list.
390 * Use GFP_ATOMIC since BHs will be disabled.
392 ret
= sctp_add_bind_addr(bp
, addr
, SCTP_ADDR_SRC
, GFP_ATOMIC
);
394 /* Copy back into socket for getsockname() use. */
396 inet_sk(sk
)->inet_sport
= htons(inet_sk(sk
)->inet_num
);
397 af
->to_sk_saddr(addr
, sk
);
403 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
405 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
406 * at any one time. If a sender, after sending an ASCONF chunk, decides
407 * it needs to transfer another ASCONF Chunk, it MUST wait until the
408 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
409 * subsequent ASCONF. Note this restriction binds each side, so at any
410 * time two ASCONF may be in-transit on any given association (one sent
411 * from each endpoint).
413 static int sctp_send_asconf(struct sctp_association
*asoc
,
414 struct sctp_chunk
*chunk
)
416 struct net
*net
= sock_net(asoc
->base
.sk
);
419 /* If there is an outstanding ASCONF chunk, queue it for later
422 if (asoc
->addip_last_asconf
) {
423 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
427 /* Hold the chunk until an ASCONF_ACK is received. */
428 sctp_chunk_hold(chunk
);
429 retval
= sctp_primitive_ASCONF(net
, asoc
, chunk
);
431 sctp_chunk_free(chunk
);
433 asoc
->addip_last_asconf
= chunk
;
439 /* Add a list of addresses as bind addresses to local endpoint or
442 * Basically run through each address specified in the addrs/addrcnt
443 * array/length pair, determine if it is IPv6 or IPv4 and call
444 * sctp_do_bind() on it.
446 * If any of them fails, then the operation will be reversed and the
447 * ones that were added will be removed.
449 * Only sctp_setsockopt_bindx() is supposed to call this function.
451 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
456 struct sockaddr
*sa_addr
;
459 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__
, sk
,
463 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
464 /* The list may contain either IPv4 or IPv6 address;
465 * determine the address length for walking thru the list.
468 af
= sctp_get_af_specific(sa_addr
->sa_family
);
474 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
477 addr_buf
+= af
->sockaddr_len
;
481 /* Failed. Cleanup the ones that have been added */
483 sctp_bindx_rem(sk
, addrs
, cnt
);
491 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
492 * associations that are part of the endpoint indicating that a list of local
493 * addresses are added to the endpoint.
495 * If any of the addresses is already in the bind address list of the
496 * association, we do not send the chunk for that association. But it will not
497 * affect other associations.
499 * Only sctp_setsockopt_bindx() is supposed to call this function.
501 static int sctp_send_asconf_add_ip(struct sock
*sk
,
502 struct sockaddr
*addrs
,
505 struct net
*net
= sock_net(sk
);
506 struct sctp_sock
*sp
;
507 struct sctp_endpoint
*ep
;
508 struct sctp_association
*asoc
;
509 struct sctp_bind_addr
*bp
;
510 struct sctp_chunk
*chunk
;
511 struct sctp_sockaddr_entry
*laddr
;
512 union sctp_addr
*addr
;
513 union sctp_addr saveaddr
;
520 if (!net
->sctp
.addip_enable
)
526 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
527 __func__
, sk
, addrs
, addrcnt
);
529 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
530 if (!asoc
->peer
.asconf_capable
)
533 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
536 if (!sctp_state(asoc
, ESTABLISHED
))
539 /* Check if any address in the packed array of addresses is
540 * in the bind address list of the association. If so,
541 * do not send the asconf chunk to its peer, but continue with
542 * other associations.
545 for (i
= 0; i
< addrcnt
; i
++) {
547 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
553 if (sctp_assoc_lookup_laddr(asoc
, addr
))
556 addr_buf
+= af
->sockaddr_len
;
561 /* Use the first valid address in bind addr list of
562 * association as Address Parameter of ASCONF CHUNK.
564 bp
= &asoc
->base
.bind_addr
;
565 p
= bp
->address_list
.next
;
566 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
567 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
568 addrcnt
, SCTP_PARAM_ADD_IP
);
574 /* Add the new addresses to the bind address list with
575 * use_as_src set to 0.
578 for (i
= 0; i
< addrcnt
; i
++) {
580 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
581 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
582 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
583 SCTP_ADDR_NEW
, GFP_ATOMIC
);
584 addr_buf
+= af
->sockaddr_len
;
586 if (asoc
->src_out_of_asoc_ok
) {
587 struct sctp_transport
*trans
;
589 list_for_each_entry(trans
,
590 &asoc
->peer
.transport_addr_list
, transports
) {
591 /* Clear the source and route cache */
592 dst_release(trans
->dst
);
593 trans
->cwnd
= min(4*asoc
->pathmtu
, max_t(__u32
,
594 2*asoc
->pathmtu
, 4380));
595 trans
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
596 trans
->rto
= asoc
->rto_initial
;
597 sctp_max_rto(asoc
, trans
);
598 trans
->rtt
= trans
->srtt
= trans
->rttvar
= 0;
599 sctp_transport_route(trans
, NULL
,
600 sctp_sk(asoc
->base
.sk
));
603 retval
= sctp_send_asconf(asoc
, chunk
);
610 /* Remove a list of addresses from bind addresses list. Do not remove the
613 * Basically run through each address specified in the addrs/addrcnt
614 * array/length pair, determine if it is IPv6 or IPv4 and call
615 * sctp_del_bind() on it.
617 * If any of them fails, then the operation will be reversed and the
618 * ones that were removed will be added back.
620 * At least one address has to be left; if only one address is
621 * available, the operation will return -EBUSY.
623 * Only sctp_setsockopt_bindx() is supposed to call this function.
625 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
627 struct sctp_sock
*sp
= sctp_sk(sk
);
628 struct sctp_endpoint
*ep
= sp
->ep
;
630 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
633 union sctp_addr
*sa_addr
;
636 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
637 __func__
, sk
, addrs
, addrcnt
);
640 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
641 /* If the bind address list is empty or if there is only one
642 * bind address, there is nothing more to be removed (we need
643 * at least one address here).
645 if (list_empty(&bp
->address_list
) ||
646 (sctp_list_single_entry(&bp
->address_list
))) {
652 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
658 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
659 retval
= -EADDRNOTAVAIL
;
663 if (sa_addr
->v4
.sin_port
&&
664 sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
669 if (!sa_addr
->v4
.sin_port
)
670 sa_addr
->v4
.sin_port
= htons(bp
->port
);
672 /* FIXME - There is probably a need to check if sk->sk_saddr and
673 * sk->sk_rcv_addr are currently set to one of the addresses to
674 * be removed. This is something which needs to be looked into
675 * when we are fixing the outstanding issues with multi-homing
676 * socket routing and failover schemes. Refer to comments in
677 * sctp_do_bind(). -daisy
679 retval
= sctp_del_bind_addr(bp
, sa_addr
);
681 addr_buf
+= af
->sockaddr_len
;
684 /* Failed. Add the ones that has been removed back */
686 sctp_bindx_add(sk
, addrs
, cnt
);
694 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
695 * the associations that are part of the endpoint indicating that a list of
696 * local addresses are removed from the endpoint.
698 * If any of the addresses is already in the bind address list of the
699 * association, we do not send the chunk for that association. But it will not
700 * affect other associations.
702 * Only sctp_setsockopt_bindx() is supposed to call this function.
704 static int sctp_send_asconf_del_ip(struct sock
*sk
,
705 struct sockaddr
*addrs
,
708 struct net
*net
= sock_net(sk
);
709 struct sctp_sock
*sp
;
710 struct sctp_endpoint
*ep
;
711 struct sctp_association
*asoc
;
712 struct sctp_transport
*transport
;
713 struct sctp_bind_addr
*bp
;
714 struct sctp_chunk
*chunk
;
715 union sctp_addr
*laddr
;
718 struct sctp_sockaddr_entry
*saddr
;
724 if (!net
->sctp
.addip_enable
)
730 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
731 __func__
, sk
, addrs
, addrcnt
);
733 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
735 if (!asoc
->peer
.asconf_capable
)
738 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
741 if (!sctp_state(asoc
, ESTABLISHED
))
744 /* Check if any address in the packed array of addresses is
745 * not present in the bind address list of the association.
746 * If so, do not send the asconf chunk to its peer, but
747 * continue with other associations.
750 for (i
= 0; i
< addrcnt
; i
++) {
752 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
758 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
761 addr_buf
+= af
->sockaddr_len
;
766 /* Find one address in the association's bind address list
767 * that is not in the packed array of addresses. This is to
768 * make sure that we do not delete all the addresses in the
771 bp
= &asoc
->base
.bind_addr
;
772 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
774 if ((laddr
== NULL
) && (addrcnt
== 1)) {
775 if (asoc
->asconf_addr_del_pending
)
777 asoc
->asconf_addr_del_pending
=
778 kzalloc(sizeof(union sctp_addr
), GFP_ATOMIC
);
779 if (asoc
->asconf_addr_del_pending
== NULL
) {
783 asoc
->asconf_addr_del_pending
->sa
.sa_family
=
785 asoc
->asconf_addr_del_pending
->v4
.sin_port
=
787 if (addrs
->sa_family
== AF_INET
) {
788 struct sockaddr_in
*sin
;
790 sin
= (struct sockaddr_in
*)addrs
;
791 asoc
->asconf_addr_del_pending
->v4
.sin_addr
.s_addr
= sin
->sin_addr
.s_addr
;
792 } else if (addrs
->sa_family
== AF_INET6
) {
793 struct sockaddr_in6
*sin6
;
795 sin6
= (struct sockaddr_in6
*)addrs
;
796 asoc
->asconf_addr_del_pending
->v6
.sin6_addr
= sin6
->sin6_addr
;
799 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
800 __func__
, asoc
, &asoc
->asconf_addr_del_pending
->sa
,
801 asoc
->asconf_addr_del_pending
);
803 asoc
->src_out_of_asoc_ok
= 1;
811 /* We do not need RCU protection throughout this loop
812 * because this is done under a socket lock from the
815 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
823 /* Reset use_as_src flag for the addresses in the bind address
824 * list that are to be deleted.
827 for (i
= 0; i
< addrcnt
; i
++) {
829 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
830 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
831 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
832 saddr
->state
= SCTP_ADDR_DEL
;
834 addr_buf
+= af
->sockaddr_len
;
837 /* Update the route and saddr entries for all the transports
838 * as some of the addresses in the bind address list are
839 * about to be deleted and cannot be used as source addresses.
841 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
843 dst_release(transport
->dst
);
844 sctp_transport_route(transport
, NULL
,
845 sctp_sk(asoc
->base
.sk
));
849 /* We don't need to transmit ASCONF */
851 retval
= sctp_send_asconf(asoc
, chunk
);
857 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
858 int sctp_asconf_mgmt(struct sctp_sock
*sp
, struct sctp_sockaddr_entry
*addrw
)
860 struct sock
*sk
= sctp_opt2sk(sp
);
861 union sctp_addr
*addr
;
864 /* It is safe to write port space in caller. */
866 addr
->v4
.sin_port
= htons(sp
->ep
->base
.bind_addr
.port
);
867 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
870 if (sctp_verify_addr(sk
, addr
, af
->sockaddr_len
))
873 if (addrw
->state
== SCTP_ADDR_NEW
)
874 return sctp_send_asconf_add_ip(sk
, (struct sockaddr
*)addr
, 1);
876 return sctp_send_asconf_del_ip(sk
, (struct sockaddr
*)addr
, 1);
879 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
882 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
885 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
886 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
889 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
890 * Section 3.1.2 for this usage.
892 * addrs is a pointer to an array of one or more socket addresses. Each
893 * address is contained in its appropriate structure (i.e. struct
894 * sockaddr_in or struct sockaddr_in6) the family of the address type
895 * must be used to distinguish the address length (note that this
896 * representation is termed a "packed array" of addresses). The caller
897 * specifies the number of addresses in the array with addrcnt.
899 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
900 * -1, and sets errno to the appropriate error code.
902 * For SCTP, the port given in each socket address must be the same, or
903 * sctp_bindx() will fail, setting errno to EINVAL.
905 * The flags parameter is formed from the bitwise OR of zero or more of
906 * the following currently defined flags:
908 * SCTP_BINDX_ADD_ADDR
910 * SCTP_BINDX_REM_ADDR
912 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
913 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
914 * addresses from the association. The two flags are mutually exclusive;
915 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
916 * not remove all addresses from an association; sctp_bindx() will
917 * reject such an attempt with EINVAL.
919 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
920 * additional addresses with an endpoint after calling bind(). Or use
921 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
922 * socket is associated with so that no new association accepted will be
923 * associated with those addresses. If the endpoint supports dynamic
924 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
925 * endpoint to send the appropriate message to the peer to change the
926 * peers address lists.
928 * Adding and removing addresses from a connected association is
929 * optional functionality. Implementations that do not support this
930 * functionality should return EOPNOTSUPP.
932 * Basically do nothing but copying the addresses from user to kernel
933 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
934 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
937 * We don't use copy_from_user() for optimization: we first do the
938 * sanity checks (buffer size -fast- and access check-healthy
939 * pointer); if all of those succeed, then we can alloc the memory
940 * (expensive operation) needed to copy the data to kernel. Then we do
941 * the copying without checking the user space area
942 * (__copy_from_user()).
944 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
947 * sk The sk of the socket
948 * addrs The pointer to the addresses in user land
949 * addrssize Size of the addrs buffer
950 * op Operation to perform (add or remove, see the flags of
953 * Returns 0 if ok, <0 errno code on error.
955 static int sctp_setsockopt_bindx(struct sock
*sk
,
956 struct sockaddr __user
*addrs
,
957 int addrs_size
, int op
)
959 struct sockaddr
*kaddrs
;
963 struct sockaddr
*sa_addr
;
967 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
968 __func__
, sk
, addrs
, addrs_size
, op
);
970 if (unlikely(addrs_size
<= 0))
973 /* Check the user passed a healthy pointer. */
974 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
977 /* Alloc space for the address array in kernel memory. */
978 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
979 if (unlikely(!kaddrs
))
982 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
987 /* Walk through the addrs buffer and count the number of addresses. */
989 while (walk_size
< addrs_size
) {
990 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
996 af
= sctp_get_af_specific(sa_addr
->sa_family
);
998 /* If the address family is not supported or if this address
999 * causes the address buffer to overflow return EINVAL.
1001 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1006 addr_buf
+= af
->sockaddr_len
;
1007 walk_size
+= af
->sockaddr_len
;
1012 case SCTP_BINDX_ADD_ADDR
:
1013 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
1016 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
1019 case SCTP_BINDX_REM_ADDR
:
1020 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
1023 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
1037 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1039 * Common routine for handling connect() and sctp_connectx().
1040 * Connect will come in with just a single address.
1042 static int __sctp_connect(struct sock
*sk
,
1043 struct sockaddr
*kaddrs
,
1045 sctp_assoc_t
*assoc_id
)
1047 struct net
*net
= sock_net(sk
);
1048 struct sctp_sock
*sp
;
1049 struct sctp_endpoint
*ep
;
1050 struct sctp_association
*asoc
= NULL
;
1051 struct sctp_association
*asoc2
;
1052 struct sctp_transport
*transport
;
1060 union sctp_addr
*sa_addr
= NULL
;
1062 unsigned short port
;
1063 unsigned int f_flags
= 0;
1068 /* connect() cannot be done on a socket that is already in ESTABLISHED
1069 * state - UDP-style peeled off socket or a TCP-style socket that
1070 * is already connected.
1071 * It cannot be done even on a TCP-style listening socket.
1073 if (sctp_sstate(sk
, ESTABLISHED
) ||
1074 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
1079 /* Walk through the addrs buffer and count the number of addresses. */
1081 while (walk_size
< addrs_size
) {
1082 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1088 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1090 /* If the address family is not supported or if this address
1091 * causes the address buffer to overflow return EINVAL.
1093 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1098 port
= ntohs(sa_addr
->v4
.sin_port
);
1100 /* Save current address so we can work with it */
1101 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1103 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1107 /* Make sure the destination port is correctly set
1110 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
) {
1115 /* Check if there already is a matching association on the
1116 * endpoint (other than the one created here).
1118 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1119 if (asoc2
&& asoc2
!= asoc
) {
1120 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1127 /* If we could not find a matching association on the endpoint,
1128 * make sure that there is no peeled-off association matching
1129 * the peer address even on another socket.
1131 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1132 err
= -EADDRNOTAVAIL
;
1137 /* If a bind() or sctp_bindx() is not called prior to
1138 * an sctp_connectx() call, the system picks an
1139 * ephemeral port and will choose an address set
1140 * equivalent to binding with a wildcard address.
1142 if (!ep
->base
.bind_addr
.port
) {
1143 if (sctp_autobind(sk
)) {
1149 * If an unprivileged user inherits a 1-many
1150 * style socket with open associations on a
1151 * privileged port, it MAY be permitted to
1152 * accept new associations, but it SHOULD NOT
1153 * be permitted to open new associations.
1155 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1156 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
)) {
1162 scope
= sctp_scope(&to
);
1163 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1169 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
,
1177 /* Prime the peer's transport structures. */
1178 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1186 addr_buf
+= af
->sockaddr_len
;
1187 walk_size
+= af
->sockaddr_len
;
1190 /* In case the user of sctp_connectx() wants an association
1191 * id back, assign one now.
1194 err
= sctp_assoc_set_id(asoc
, GFP_KERNEL
);
1199 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1204 /* Initialize sk's dport and daddr for getpeername() */
1205 inet_sk(sk
)->inet_dport
= htons(asoc
->peer
.port
);
1206 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1207 af
->to_sk_daddr(sa_addr
, sk
);
1210 /* in-kernel sockets don't generally have a file allocated to them
1211 * if all they do is call sock_create_kern().
1213 if (sk
->sk_socket
->file
)
1214 f_flags
= sk
->sk_socket
->file
->f_flags
;
1216 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1218 err
= sctp_wait_for_connect(asoc
, &timeo
);
1219 if ((err
== 0 || err
== -EINPROGRESS
) && assoc_id
)
1220 *assoc_id
= asoc
->assoc_id
;
1222 /* Don't free association on exit. */
1226 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1227 __func__
, asoc
, kaddrs
, err
);
1230 /* sctp_primitive_ASSOCIATE may have added this association
1231 * To the hash table, try to unhash it, just in case, its a noop
1232 * if it wasn't hashed so we're safe
1234 sctp_unhash_established(asoc
);
1235 sctp_association_free(asoc
);
1240 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1243 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1244 * sctp_assoc_t *asoc);
1246 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1247 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1248 * or IPv6 addresses.
1250 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1251 * Section 3.1.2 for this usage.
1253 * addrs is a pointer to an array of one or more socket addresses. Each
1254 * address is contained in its appropriate structure (i.e. struct
1255 * sockaddr_in or struct sockaddr_in6) the family of the address type
1256 * must be used to distengish the address length (note that this
1257 * representation is termed a "packed array" of addresses). The caller
1258 * specifies the number of addresses in the array with addrcnt.
1260 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1261 * the association id of the new association. On failure, sctp_connectx()
1262 * returns -1, and sets errno to the appropriate error code. The assoc_id
1263 * is not touched by the kernel.
1265 * For SCTP, the port given in each socket address must be the same, or
1266 * sctp_connectx() will fail, setting errno to EINVAL.
1268 * An application can use sctp_connectx to initiate an association with
1269 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1270 * allows a caller to specify multiple addresses at which a peer can be
1271 * reached. The way the SCTP stack uses the list of addresses to set up
1272 * the association is implementation dependent. This function only
1273 * specifies that the stack will try to make use of all the addresses in
1274 * the list when needed.
1276 * Note that the list of addresses passed in is only used for setting up
1277 * the association. It does not necessarily equal the set of addresses
1278 * the peer uses for the resulting association. If the caller wants to
1279 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1280 * retrieve them after the association has been set up.
1282 * Basically do nothing but copying the addresses from user to kernel
1283 * land and invoking either sctp_connectx(). This is used for tunneling
1284 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1286 * We don't use copy_from_user() for optimization: we first do the
1287 * sanity checks (buffer size -fast- and access check-healthy
1288 * pointer); if all of those succeed, then we can alloc the memory
1289 * (expensive operation) needed to copy the data to kernel. Then we do
1290 * the copying without checking the user space area
1291 * (__copy_from_user()).
1293 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1296 * sk The sk of the socket
1297 * addrs The pointer to the addresses in user land
1298 * addrssize Size of the addrs buffer
1300 * Returns >=0 if ok, <0 errno code on error.
1302 static int __sctp_setsockopt_connectx(struct sock
*sk
,
1303 struct sockaddr __user
*addrs
,
1305 sctp_assoc_t
*assoc_id
)
1308 struct sockaddr
*kaddrs
;
1310 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1311 __func__
, sk
, addrs
, addrs_size
);
1313 if (unlikely(addrs_size
<= 0))
1316 /* Check the user passed a healthy pointer. */
1317 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1320 /* Alloc space for the address array in kernel memory. */
1321 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1322 if (unlikely(!kaddrs
))
1325 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1328 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, assoc_id
);
1337 * This is an older interface. It's kept for backward compatibility
1338 * to the option that doesn't provide association id.
1340 static int sctp_setsockopt_connectx_old(struct sock
*sk
,
1341 struct sockaddr __user
*addrs
,
1344 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1348 * New interface for the API. The since the API is done with a socket
1349 * option, to make it simple we feed back the association id is as a return
1350 * indication to the call. Error is always negative and association id is
1353 static int sctp_setsockopt_connectx(struct sock
*sk
,
1354 struct sockaddr __user
*addrs
,
1357 sctp_assoc_t assoc_id
= 0;
1360 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1369 * New (hopefully final) interface for the API.
1370 * We use the sctp_getaddrs_old structure so that use-space library
1371 * can avoid any unnecessary allocations. The only defferent part
1372 * is that we store the actual length of the address buffer into the
1373 * addrs_num structure member. That way we can re-use the existing
1376 static int sctp_getsockopt_connectx3(struct sock
*sk
, int len
,
1377 char __user
*optval
,
1380 struct sctp_getaddrs_old param
;
1381 sctp_assoc_t assoc_id
= 0;
1384 if (len
< sizeof(param
))
1387 if (copy_from_user(¶m
, optval
, sizeof(param
)))
1390 err
= __sctp_setsockopt_connectx(sk
,
1391 (struct sockaddr __user
*)param
.addrs
,
1392 param
.addr_num
, &assoc_id
);
1394 if (err
== 0 || err
== -EINPROGRESS
) {
1395 if (copy_to_user(optval
, &assoc_id
, sizeof(assoc_id
)))
1397 if (put_user(sizeof(assoc_id
), optlen
))
1404 /* API 3.1.4 close() - UDP Style Syntax
1405 * Applications use close() to perform graceful shutdown (as described in
1406 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1407 * by a UDP-style socket.
1411 * ret = close(int sd);
1413 * sd - the socket descriptor of the associations to be closed.
1415 * To gracefully shutdown a specific association represented by the
1416 * UDP-style socket, an application should use the sendmsg() call,
1417 * passing no user data, but including the appropriate flag in the
1418 * ancillary data (see Section xxxx).
1420 * If sd in the close() call is a branched-off socket representing only
1421 * one association, the shutdown is performed on that association only.
1423 * 4.1.6 close() - TCP Style Syntax
1425 * Applications use close() to gracefully close down an association.
1429 * int close(int sd);
1431 * sd - the socket descriptor of the association to be closed.
1433 * After an application calls close() on a socket descriptor, no further
1434 * socket operations will succeed on that descriptor.
1436 * API 7.1.4 SO_LINGER
1438 * An application using the TCP-style socket can use this option to
1439 * perform the SCTP ABORT primitive. The linger option structure is:
1442 * int l_onoff; // option on/off
1443 * int l_linger; // linger time
1446 * To enable the option, set l_onoff to 1. If the l_linger value is set
1447 * to 0, calling close() is the same as the ABORT primitive. If the
1448 * value is set to a negative value, the setsockopt() call will return
1449 * an error. If the value is set to a positive value linger_time, the
1450 * close() can be blocked for at most linger_time ms. If the graceful
1451 * shutdown phase does not finish during this period, close() will
1452 * return but the graceful shutdown phase continues in the system.
1454 static void sctp_close(struct sock
*sk
, long timeout
)
1456 struct net
*net
= sock_net(sk
);
1457 struct sctp_endpoint
*ep
;
1458 struct sctp_association
*asoc
;
1459 struct list_head
*pos
, *temp
;
1460 unsigned int data_was_unread
;
1462 pr_debug("%s: sk:%p, timeout:%ld\n", __func__
, sk
, timeout
);
1465 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1466 sk
->sk_state
= SCTP_SS_CLOSING
;
1468 ep
= sctp_sk(sk
)->ep
;
1470 /* Clean up any skbs sitting on the receive queue. */
1471 data_was_unread
= sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1472 data_was_unread
+= sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1474 /* Walk all associations on an endpoint. */
1475 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1476 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1478 if (sctp_style(sk
, TCP
)) {
1479 /* A closed association can still be in the list if
1480 * it belongs to a TCP-style listening socket that is
1481 * not yet accepted. If so, free it. If not, send an
1482 * ABORT or SHUTDOWN based on the linger options.
1484 if (sctp_state(asoc
, CLOSED
)) {
1485 sctp_unhash_established(asoc
);
1486 sctp_association_free(asoc
);
1491 if (data_was_unread
|| !skb_queue_empty(&asoc
->ulpq
.lobby
) ||
1492 !skb_queue_empty(&asoc
->ulpq
.reasm
) ||
1493 (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
)) {
1494 struct sctp_chunk
*chunk
;
1496 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1498 sctp_primitive_ABORT(net
, asoc
, chunk
);
1500 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1503 /* On a TCP-style socket, block for at most linger_time if set. */
1504 if (sctp_style(sk
, TCP
) && timeout
)
1505 sctp_wait_for_close(sk
, timeout
);
1507 /* This will run the backlog queue. */
1508 sctp_release_sock(sk
);
1510 /* Supposedly, no process has access to the socket, but
1511 * the net layers still may.
1513 sctp_local_bh_disable();
1514 sctp_bh_lock_sock(sk
);
1516 /* Hold the sock, since sk_common_release() will put sock_put()
1517 * and we have just a little more cleanup.
1520 sk_common_release(sk
);
1522 sctp_bh_unlock_sock(sk
);
1523 sctp_local_bh_enable();
1527 SCTP_DBG_OBJCNT_DEC(sock
);
1530 /* Handle EPIPE error. */
1531 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1534 err
= sock_error(sk
) ? : -EPIPE
;
1535 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1536 send_sig(SIGPIPE
, current
, 0);
1540 /* API 3.1.3 sendmsg() - UDP Style Syntax
1542 * An application uses sendmsg() and recvmsg() calls to transmit data to
1543 * and receive data from its peer.
1545 * ssize_t sendmsg(int socket, const struct msghdr *message,
1548 * socket - the socket descriptor of the endpoint.
1549 * message - pointer to the msghdr structure which contains a single
1550 * user message and possibly some ancillary data.
1552 * See Section 5 for complete description of the data
1555 * flags - flags sent or received with the user message, see Section
1556 * 5 for complete description of the flags.
1558 * Note: This function could use a rewrite especially when explicit
1559 * connect support comes in.
1561 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1563 static int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1565 static int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1566 struct msghdr
*msg
, size_t msg_len
)
1568 struct net
*net
= sock_net(sk
);
1569 struct sctp_sock
*sp
;
1570 struct sctp_endpoint
*ep
;
1571 struct sctp_association
*new_asoc
= NULL
, *asoc
= NULL
;
1572 struct sctp_transport
*transport
, *chunk_tp
;
1573 struct sctp_chunk
*chunk
;
1575 struct sockaddr
*msg_name
= NULL
;
1576 struct sctp_sndrcvinfo default_sinfo
;
1577 struct sctp_sndrcvinfo
*sinfo
;
1578 struct sctp_initmsg
*sinit
;
1579 sctp_assoc_t associd
= 0;
1580 sctp_cmsgs_t cmsgs
= { NULL
};
1584 __u16 sinfo_flags
= 0;
1585 struct sctp_datamsg
*datamsg
;
1586 int msg_flags
= msg
->msg_flags
;
1592 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__
, sk
,
1595 /* We cannot send a message over a TCP-style listening socket. */
1596 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1601 /* Parse out the SCTP CMSGs. */
1602 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1604 pr_debug("%s: msghdr parse err:%x\n", __func__
, err
);
1608 /* Fetch the destination address for this packet. This
1609 * address only selects the association--it is not necessarily
1610 * the address we will send to.
1611 * For a peeled-off socket, msg_name is ignored.
1613 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1614 int msg_namelen
= msg
->msg_namelen
;
1616 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1621 if (msg_namelen
> sizeof(to
))
1622 msg_namelen
= sizeof(to
);
1623 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1624 msg_name
= msg
->msg_name
;
1630 /* Did the user specify SNDRCVINFO? */
1632 sinfo_flags
= sinfo
->sinfo_flags
;
1633 associd
= sinfo
->sinfo_assoc_id
;
1636 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__
,
1637 msg_len
, sinfo_flags
);
1639 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1640 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1645 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1646 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1647 * If SCTP_ABORT is set, the message length could be non zero with
1648 * the msg_iov set to the user abort reason.
1650 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1651 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1656 /* If SCTP_ADDR_OVER is set, there must be an address
1657 * specified in msg_name.
1659 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1666 pr_debug("%s: about to look up association\n", __func__
);
1670 /* If a msg_name has been specified, assume this is to be used. */
1672 /* Look for a matching association on the endpoint. */
1673 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1675 /* If we could not find a matching association on the
1676 * endpoint, make sure that it is not a TCP-style
1677 * socket that already has an association or there is
1678 * no peeled-off association on another socket.
1680 if ((sctp_style(sk
, TCP
) &&
1681 sctp_sstate(sk
, ESTABLISHED
)) ||
1682 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1683 err
= -EADDRNOTAVAIL
;
1688 asoc
= sctp_id2assoc(sk
, associd
);
1696 pr_debug("%s: just looked up association:%p\n", __func__
, asoc
);
1698 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1699 * socket that has an association in CLOSED state. This can
1700 * happen when an accepted socket has an association that is
1703 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1708 if (sinfo_flags
& SCTP_EOF
) {
1709 pr_debug("%s: shutting down association:%p\n",
1712 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1716 if (sinfo_flags
& SCTP_ABORT
) {
1718 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1724 pr_debug("%s: aborting association:%p\n",
1727 sctp_primitive_ABORT(net
, asoc
, chunk
);
1733 /* Do we need to create the association? */
1735 pr_debug("%s: there is no association yet\n", __func__
);
1737 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1742 /* Check for invalid stream against the stream counts,
1743 * either the default or the user specified stream counts.
1746 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1747 /* Check against the defaults. */
1748 if (sinfo
->sinfo_stream
>=
1749 sp
->initmsg
.sinit_num_ostreams
) {
1754 /* Check against the requested. */
1755 if (sinfo
->sinfo_stream
>=
1756 sinit
->sinit_num_ostreams
) {
1764 * API 3.1.2 bind() - UDP Style Syntax
1765 * If a bind() or sctp_bindx() is not called prior to a
1766 * sendmsg() call that initiates a new association, the
1767 * system picks an ephemeral port and will choose an address
1768 * set equivalent to binding with a wildcard address.
1770 if (!ep
->base
.bind_addr
.port
) {
1771 if (sctp_autobind(sk
)) {
1777 * If an unprivileged user inherits a one-to-many
1778 * style socket with open associations on a privileged
1779 * port, it MAY be permitted to accept new associations,
1780 * but it SHOULD NOT be permitted to open new
1783 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1784 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
)) {
1790 scope
= sctp_scope(&to
);
1791 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1797 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
, GFP_KERNEL
);
1803 /* If the SCTP_INIT ancillary data is specified, set all
1804 * the association init values accordingly.
1807 if (sinit
->sinit_num_ostreams
) {
1808 asoc
->c
.sinit_num_ostreams
=
1809 sinit
->sinit_num_ostreams
;
1811 if (sinit
->sinit_max_instreams
) {
1812 asoc
->c
.sinit_max_instreams
=
1813 sinit
->sinit_max_instreams
;
1815 if (sinit
->sinit_max_attempts
) {
1816 asoc
->max_init_attempts
1817 = sinit
->sinit_max_attempts
;
1819 if (sinit
->sinit_max_init_timeo
) {
1820 asoc
->max_init_timeo
=
1821 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1825 /* Prime the peer's transport structures. */
1826 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1833 /* ASSERT: we have a valid association at this point. */
1834 pr_debug("%s: we have a valid association\n", __func__
);
1837 /* If the user didn't specify SNDRCVINFO, make up one with
1840 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1841 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1842 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1843 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1844 default_sinfo
.sinfo_context
= asoc
->default_context
;
1845 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1846 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1847 sinfo
= &default_sinfo
;
1850 /* API 7.1.7, the sndbuf size per association bounds the
1851 * maximum size of data that can be sent in a single send call.
1853 if (msg_len
> sk
->sk_sndbuf
) {
1858 if (asoc
->pmtu_pending
)
1859 sctp_assoc_pending_pmtu(sk
, asoc
);
1861 /* If fragmentation is disabled and the message length exceeds the
1862 * association fragmentation point, return EMSGSIZE. The I-D
1863 * does not specify what this error is, but this looks like
1866 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1871 /* Check for invalid stream. */
1872 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1877 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1878 if (!sctp_wspace(asoc
)) {
1879 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1884 /* If an address is passed with the sendto/sendmsg call, it is used
1885 * to override the primary destination address in the TCP model, or
1886 * when SCTP_ADDR_OVER flag is set in the UDP model.
1888 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1889 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1890 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1898 /* Auto-connect, if we aren't connected already. */
1899 if (sctp_state(asoc
, CLOSED
)) {
1900 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1904 pr_debug("%s: we associated primitively\n", __func__
);
1907 /* Break the message into multiple chunks of maximum size. */
1908 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1909 if (IS_ERR(datamsg
)) {
1910 err
= PTR_ERR(datamsg
);
1914 /* Now send the (possibly) fragmented message. */
1915 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1916 sctp_chunk_hold(chunk
);
1918 /* Do accounting for the write space. */
1919 sctp_set_owner_w(chunk
);
1921 chunk
->transport
= chunk_tp
;
1924 /* Send it to the lower layers. Note: all chunks
1925 * must either fail or succeed. The lower layer
1926 * works that way today. Keep it that way or this
1929 err
= sctp_primitive_SEND(net
, asoc
, datamsg
);
1930 /* Did the lower layer accept the chunk? */
1932 sctp_datamsg_free(datamsg
);
1936 pr_debug("%s: we sent primitively\n", __func__
);
1938 sctp_datamsg_put(datamsg
);
1941 /* If we are already past ASSOCIATE, the lower
1942 * layers are responsible for association cleanup.
1948 sctp_unhash_established(asoc
);
1949 sctp_association_free(asoc
);
1952 sctp_release_sock(sk
);
1955 return sctp_error(sk
, msg_flags
, err
);
1962 err
= sock_error(sk
);
1972 /* This is an extended version of skb_pull() that removes the data from the
1973 * start of a skb even when data is spread across the list of skb's in the
1974 * frag_list. len specifies the total amount of data that needs to be removed.
1975 * when 'len' bytes could be removed from the skb, it returns 0.
1976 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1977 * could not be removed.
1979 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1981 struct sk_buff
*list
;
1982 int skb_len
= skb_headlen(skb
);
1985 if (len
<= skb_len
) {
1986 __skb_pull(skb
, len
);
1990 __skb_pull(skb
, skb_len
);
1992 skb_walk_frags(skb
, list
) {
1993 rlen
= sctp_skb_pull(list
, len
);
1994 skb
->len
-= (len
-rlen
);
1995 skb
->data_len
-= (len
-rlen
);
2006 /* API 3.1.3 recvmsg() - UDP Style Syntax
2008 * ssize_t recvmsg(int socket, struct msghdr *message,
2011 * socket - the socket descriptor of the endpoint.
2012 * message - pointer to the msghdr structure which contains a single
2013 * user message and possibly some ancillary data.
2015 * See Section 5 for complete description of the data
2018 * flags - flags sent or received with the user message, see Section
2019 * 5 for complete description of the flags.
2021 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
2023 static int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
2024 struct msghdr
*msg
, size_t len
, int noblock
,
2025 int flags
, int *addr_len
)
2027 struct sctp_ulpevent
*event
= NULL
;
2028 struct sctp_sock
*sp
= sctp_sk(sk
);
2029 struct sk_buff
*skb
;
2034 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2035 "addr_len:%p)\n", __func__
, sk
, msg
, len
, noblock
, flags
,
2040 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
2045 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
2049 /* Get the total length of the skb including any skb's in the
2058 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
2060 event
= sctp_skb2event(skb
);
2065 sock_recv_ts_and_drops(msg
, sk
, skb
);
2066 if (sctp_ulpevent_is_notification(event
)) {
2067 msg
->msg_flags
|= MSG_NOTIFICATION
;
2068 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
2070 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
2073 /* Check if we allow SCTP_SNDRCVINFO. */
2074 if (sp
->subscribe
.sctp_data_io_event
)
2075 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
2077 /* FIXME: we should be calling IP/IPv6 layers. */
2078 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
2079 ip_cmsg_recv(msg
, skb
);
2084 /* If skb's length exceeds the user's buffer, update the skb and
2085 * push it back to the receive_queue so that the next call to
2086 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2088 if (skb_len
> copied
) {
2089 msg
->msg_flags
&= ~MSG_EOR
;
2090 if (flags
& MSG_PEEK
)
2092 sctp_skb_pull(skb
, copied
);
2093 skb_queue_head(&sk
->sk_receive_queue
, skb
);
2095 /* When only partial message is copied to the user, increase
2096 * rwnd by that amount. If all the data in the skb is read,
2097 * rwnd is updated when the event is freed.
2099 if (!sctp_ulpevent_is_notification(event
))
2100 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
2102 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
2103 (event
->msg_flags
& MSG_EOR
))
2104 msg
->msg_flags
|= MSG_EOR
;
2106 msg
->msg_flags
&= ~MSG_EOR
;
2109 if (flags
& MSG_PEEK
) {
2110 /* Release the skb reference acquired after peeking the skb in
2111 * sctp_skb_recv_datagram().
2115 /* Free the event which includes releasing the reference to
2116 * the owner of the skb, freeing the skb and updating the
2119 sctp_ulpevent_free(event
);
2122 sctp_release_sock(sk
);
2126 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2128 * This option is a on/off flag. If enabled no SCTP message
2129 * fragmentation will be performed. Instead if a message being sent
2130 * exceeds the current PMTU size, the message will NOT be sent and
2131 * instead a error will be indicated to the user.
2133 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
2134 char __user
*optval
,
2135 unsigned int optlen
)
2139 if (optlen
< sizeof(int))
2142 if (get_user(val
, (int __user
*)optval
))
2145 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
2150 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2151 unsigned int optlen
)
2153 struct sctp_association
*asoc
;
2154 struct sctp_ulpevent
*event
;
2156 if (optlen
> sizeof(struct sctp_event_subscribe
))
2158 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2162 * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2163 * if there is no data to be sent or retransmit, the stack will
2164 * immediately send up this notification.
2166 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT
,
2167 &sctp_sk(sk
)->subscribe
)) {
2168 asoc
= sctp_id2assoc(sk
, 0);
2170 if (asoc
&& sctp_outq_is_empty(&asoc
->outqueue
)) {
2171 event
= sctp_ulpevent_make_sender_dry_event(asoc
,
2176 sctp_ulpq_tail_event(&asoc
->ulpq
, event
);
2183 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2185 * This socket option is applicable to the UDP-style socket only. When
2186 * set it will cause associations that are idle for more than the
2187 * specified number of seconds to automatically close. An association
2188 * being idle is defined an association that has NOT sent or received
2189 * user data. The special value of '0' indicates that no automatic
2190 * close of any associations should be performed. The option expects an
2191 * integer defining the number of seconds of idle time before an
2192 * association is closed.
2194 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2195 unsigned int optlen
)
2197 struct sctp_sock
*sp
= sctp_sk(sk
);
2198 struct net
*net
= sock_net(sk
);
2200 /* Applicable to UDP-style socket only */
2201 if (sctp_style(sk
, TCP
))
2203 if (optlen
!= sizeof(int))
2205 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2208 if (sp
->autoclose
> net
->sctp
.max_autoclose
)
2209 sp
->autoclose
= net
->sctp
.max_autoclose
;
2214 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2216 * Applications can enable or disable heartbeats for any peer address of
2217 * an association, modify an address's heartbeat interval, force a
2218 * heartbeat to be sent immediately, and adjust the address's maximum
2219 * number of retransmissions sent before an address is considered
2220 * unreachable. The following structure is used to access and modify an
2221 * address's parameters:
2223 * struct sctp_paddrparams {
2224 * sctp_assoc_t spp_assoc_id;
2225 * struct sockaddr_storage spp_address;
2226 * uint32_t spp_hbinterval;
2227 * uint16_t spp_pathmaxrxt;
2228 * uint32_t spp_pathmtu;
2229 * uint32_t spp_sackdelay;
2230 * uint32_t spp_flags;
2233 * spp_assoc_id - (one-to-many style socket) This is filled in the
2234 * application, and identifies the association for
2236 * spp_address - This specifies which address is of interest.
2237 * spp_hbinterval - This contains the value of the heartbeat interval,
2238 * in milliseconds. If a value of zero
2239 * is present in this field then no changes are to
2240 * be made to this parameter.
2241 * spp_pathmaxrxt - This contains the maximum number of
2242 * retransmissions before this address shall be
2243 * considered unreachable. If a value of zero
2244 * is present in this field then no changes are to
2245 * be made to this parameter.
2246 * spp_pathmtu - When Path MTU discovery is disabled the value
2247 * specified here will be the "fixed" path mtu.
2248 * Note that if the spp_address field is empty
2249 * then all associations on this address will
2250 * have this fixed path mtu set upon them.
2252 * spp_sackdelay - When delayed sack is enabled, this value specifies
2253 * the number of milliseconds that sacks will be delayed
2254 * for. This value will apply to all addresses of an
2255 * association if the spp_address field is empty. Note
2256 * also, that if delayed sack is enabled and this
2257 * value is set to 0, no change is made to the last
2258 * recorded delayed sack timer value.
2260 * spp_flags - These flags are used to control various features
2261 * on an association. The flag field may contain
2262 * zero or more of the following options.
2264 * SPP_HB_ENABLE - Enable heartbeats on the
2265 * specified address. Note that if the address
2266 * field is empty all addresses for the association
2267 * have heartbeats enabled upon them.
2269 * SPP_HB_DISABLE - Disable heartbeats on the
2270 * speicifed address. Note that if the address
2271 * field is empty all addresses for the association
2272 * will have their heartbeats disabled. Note also
2273 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2274 * mutually exclusive, only one of these two should
2275 * be specified. Enabling both fields will have
2276 * undetermined results.
2278 * SPP_HB_DEMAND - Request a user initiated heartbeat
2279 * to be made immediately.
2281 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2282 * heartbeat delayis to be set to the value of 0
2285 * SPP_PMTUD_ENABLE - This field will enable PMTU
2286 * discovery upon the specified address. Note that
2287 * if the address feild is empty then all addresses
2288 * on the association are effected.
2290 * SPP_PMTUD_DISABLE - This field will disable PMTU
2291 * discovery upon the specified address. Note that
2292 * if the address feild is empty then all addresses
2293 * on the association are effected. Not also that
2294 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2295 * exclusive. Enabling both will have undetermined
2298 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2299 * on delayed sack. The time specified in spp_sackdelay
2300 * is used to specify the sack delay for this address. Note
2301 * that if spp_address is empty then all addresses will
2302 * enable delayed sack and take on the sack delay
2303 * value specified in spp_sackdelay.
2304 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2305 * off delayed sack. If the spp_address field is blank then
2306 * delayed sack is disabled for the entire association. Note
2307 * also that this field is mutually exclusive to
2308 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2311 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2312 struct sctp_transport
*trans
,
2313 struct sctp_association
*asoc
,
2314 struct sctp_sock
*sp
,
2317 int sackdelay_change
)
2321 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2322 struct net
*net
= sock_net(trans
->asoc
->base
.sk
);
2324 error
= sctp_primitive_REQUESTHEARTBEAT(net
, trans
->asoc
, trans
);
2329 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2330 * this field is ignored. Note also that a value of zero indicates
2331 * the current setting should be left unchanged.
2333 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2335 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2336 * set. This lets us use 0 value when this flag
2339 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2340 params
->spp_hbinterval
= 0;
2342 if (params
->spp_hbinterval
||
2343 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2346 msecs_to_jiffies(params
->spp_hbinterval
);
2349 msecs_to_jiffies(params
->spp_hbinterval
);
2351 sp
->hbinterval
= params
->spp_hbinterval
;
2358 trans
->param_flags
=
2359 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2362 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2365 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2369 /* When Path MTU discovery is disabled the value specified here will
2370 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2371 * include the flag SPP_PMTUD_DISABLE for this field to have any
2374 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2376 trans
->pathmtu
= params
->spp_pathmtu
;
2377 sctp_assoc_sync_pmtu(sctp_opt2sk(sp
), asoc
);
2379 asoc
->pathmtu
= params
->spp_pathmtu
;
2380 sctp_frag_point(asoc
, params
->spp_pathmtu
);
2382 sp
->pathmtu
= params
->spp_pathmtu
;
2388 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2389 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2390 trans
->param_flags
=
2391 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2393 sctp_transport_pmtu(trans
, sctp_opt2sk(sp
));
2394 sctp_assoc_sync_pmtu(sctp_opt2sk(sp
), asoc
);
2398 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2401 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2405 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2406 * value of this field is ignored. Note also that a value of zero
2407 * indicates the current setting should be left unchanged.
2409 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2412 msecs_to_jiffies(params
->spp_sackdelay
);
2415 msecs_to_jiffies(params
->spp_sackdelay
);
2417 sp
->sackdelay
= params
->spp_sackdelay
;
2421 if (sackdelay_change
) {
2423 trans
->param_flags
=
2424 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2428 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2432 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2437 /* Note that a value of zero indicates the current setting should be
2440 if (params
->spp_pathmaxrxt
) {
2442 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2444 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2446 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2453 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2454 char __user
*optval
,
2455 unsigned int optlen
)
2457 struct sctp_paddrparams params
;
2458 struct sctp_transport
*trans
= NULL
;
2459 struct sctp_association
*asoc
= NULL
;
2460 struct sctp_sock
*sp
= sctp_sk(sk
);
2462 int hb_change
, pmtud_change
, sackdelay_change
;
2464 if (optlen
!= sizeof(struct sctp_paddrparams
))
2467 if (copy_from_user(¶ms
, optval
, optlen
))
2470 /* Validate flags and value parameters. */
2471 hb_change
= params
.spp_flags
& SPP_HB
;
2472 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2473 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2475 if (hb_change
== SPP_HB
||
2476 pmtud_change
== SPP_PMTUD
||
2477 sackdelay_change
== SPP_SACKDELAY
||
2478 params
.spp_sackdelay
> 500 ||
2479 (params
.spp_pathmtu
&&
2480 params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2483 /* If an address other than INADDR_ANY is specified, and
2484 * no transport is found, then the request is invalid.
2486 if (!sctp_is_any(sk
, (union sctp_addr
*)¶ms
.spp_address
)) {
2487 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2488 params
.spp_assoc_id
);
2493 /* Get association, if assoc_id != 0 and the socket is a one
2494 * to many style socket, and an association was not found, then
2495 * the id was invalid.
2497 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2498 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2501 /* Heartbeat demand can only be sent on a transport or
2502 * association, but not a socket.
2504 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2507 /* Process parameters. */
2508 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2509 hb_change
, pmtud_change
,
2515 /* If changes are for association, also apply parameters to each
2518 if (!trans
&& asoc
) {
2519 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2521 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2522 hb_change
, pmtud_change
,
2531 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2533 * This option will effect the way delayed acks are performed. This
2534 * option allows you to get or set the delayed ack time, in
2535 * milliseconds. It also allows changing the delayed ack frequency.
2536 * Changing the frequency to 1 disables the delayed sack algorithm. If
2537 * the assoc_id is 0, then this sets or gets the endpoints default
2538 * values. If the assoc_id field is non-zero, then the set or get
2539 * effects the specified association for the one to many model (the
2540 * assoc_id field is ignored by the one to one model). Note that if
2541 * sack_delay or sack_freq are 0 when setting this option, then the
2542 * current values will remain unchanged.
2544 * struct sctp_sack_info {
2545 * sctp_assoc_t sack_assoc_id;
2546 * uint32_t sack_delay;
2547 * uint32_t sack_freq;
2550 * sack_assoc_id - This parameter, indicates which association the user
2551 * is performing an action upon. Note that if this field's value is
2552 * zero then the endpoints default value is changed (effecting future
2553 * associations only).
2555 * sack_delay - This parameter contains the number of milliseconds that
2556 * the user is requesting the delayed ACK timer be set to. Note that
2557 * this value is defined in the standard to be between 200 and 500
2560 * sack_freq - This parameter contains the number of packets that must
2561 * be received before a sack is sent without waiting for the delay
2562 * timer to expire. The default value for this is 2, setting this
2563 * value to 1 will disable the delayed sack algorithm.
2566 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2567 char __user
*optval
, unsigned int optlen
)
2569 struct sctp_sack_info params
;
2570 struct sctp_transport
*trans
= NULL
;
2571 struct sctp_association
*asoc
= NULL
;
2572 struct sctp_sock
*sp
= sctp_sk(sk
);
2574 if (optlen
== sizeof(struct sctp_sack_info
)) {
2575 if (copy_from_user(¶ms
, optval
, optlen
))
2578 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2580 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2581 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2582 pr_warn("Use struct sctp_sack_info instead\n");
2583 if (copy_from_user(¶ms
, optval
, optlen
))
2586 if (params
.sack_delay
== 0)
2587 params
.sack_freq
= 1;
2589 params
.sack_freq
= 0;
2593 /* Validate value parameter. */
2594 if (params
.sack_delay
> 500)
2597 /* Get association, if sack_assoc_id != 0 and the socket is a one
2598 * to many style socket, and an association was not found, then
2599 * the id was invalid.
2601 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2602 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2605 if (params
.sack_delay
) {
2608 msecs_to_jiffies(params
.sack_delay
);
2610 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2611 SPP_SACKDELAY_ENABLE
;
2613 sp
->sackdelay
= params
.sack_delay
;
2615 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2616 SPP_SACKDELAY_ENABLE
;
2620 if (params
.sack_freq
== 1) {
2623 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2624 SPP_SACKDELAY_DISABLE
;
2627 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2628 SPP_SACKDELAY_DISABLE
;
2630 } else if (params
.sack_freq
> 1) {
2632 asoc
->sackfreq
= params
.sack_freq
;
2634 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2635 SPP_SACKDELAY_ENABLE
;
2637 sp
->sackfreq
= params
.sack_freq
;
2639 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2640 SPP_SACKDELAY_ENABLE
;
2644 /* If change is for association, also apply to each transport. */
2646 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2648 if (params
.sack_delay
) {
2650 msecs_to_jiffies(params
.sack_delay
);
2651 trans
->param_flags
=
2652 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2653 SPP_SACKDELAY_ENABLE
;
2655 if (params
.sack_freq
== 1) {
2656 trans
->param_flags
=
2657 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2658 SPP_SACKDELAY_DISABLE
;
2659 } else if (params
.sack_freq
> 1) {
2660 trans
->sackfreq
= params
.sack_freq
;
2661 trans
->param_flags
=
2662 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2663 SPP_SACKDELAY_ENABLE
;
2671 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2673 * Applications can specify protocol parameters for the default association
2674 * initialization. The option name argument to setsockopt() and getsockopt()
2677 * Setting initialization parameters is effective only on an unconnected
2678 * socket (for UDP-style sockets only future associations are effected
2679 * by the change). With TCP-style sockets, this option is inherited by
2680 * sockets derived from a listener socket.
2682 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2684 struct sctp_initmsg sinit
;
2685 struct sctp_sock
*sp
= sctp_sk(sk
);
2687 if (optlen
!= sizeof(struct sctp_initmsg
))
2689 if (copy_from_user(&sinit
, optval
, optlen
))
2692 if (sinit
.sinit_num_ostreams
)
2693 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2694 if (sinit
.sinit_max_instreams
)
2695 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2696 if (sinit
.sinit_max_attempts
)
2697 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2698 if (sinit
.sinit_max_init_timeo
)
2699 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2705 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2707 * Applications that wish to use the sendto() system call may wish to
2708 * specify a default set of parameters that would normally be supplied
2709 * through the inclusion of ancillary data. This socket option allows
2710 * such an application to set the default sctp_sndrcvinfo structure.
2711 * The application that wishes to use this socket option simply passes
2712 * in to this call the sctp_sndrcvinfo structure defined in Section
2713 * 5.2.2) The input parameters accepted by this call include
2714 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2715 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2716 * to this call if the caller is using the UDP model.
2718 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2719 char __user
*optval
,
2720 unsigned int optlen
)
2722 struct sctp_sndrcvinfo info
;
2723 struct sctp_association
*asoc
;
2724 struct sctp_sock
*sp
= sctp_sk(sk
);
2726 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2728 if (copy_from_user(&info
, optval
, optlen
))
2731 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2732 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2736 asoc
->default_stream
= info
.sinfo_stream
;
2737 asoc
->default_flags
= info
.sinfo_flags
;
2738 asoc
->default_ppid
= info
.sinfo_ppid
;
2739 asoc
->default_context
= info
.sinfo_context
;
2740 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2742 sp
->default_stream
= info
.sinfo_stream
;
2743 sp
->default_flags
= info
.sinfo_flags
;
2744 sp
->default_ppid
= info
.sinfo_ppid
;
2745 sp
->default_context
= info
.sinfo_context
;
2746 sp
->default_timetolive
= info
.sinfo_timetolive
;
2752 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2754 * Requests that the local SCTP stack use the enclosed peer address as
2755 * the association primary. The enclosed address must be one of the
2756 * association peer's addresses.
2758 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2759 unsigned int optlen
)
2761 struct sctp_prim prim
;
2762 struct sctp_transport
*trans
;
2764 if (optlen
!= sizeof(struct sctp_prim
))
2767 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2770 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2774 sctp_assoc_set_primary(trans
->asoc
, trans
);
2780 * 7.1.5 SCTP_NODELAY
2782 * Turn on/off any Nagle-like algorithm. This means that packets are
2783 * generally sent as soon as possible and no unnecessary delays are
2784 * introduced, at the cost of more packets in the network. Expects an
2785 * integer boolean flag.
2787 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2788 unsigned int optlen
)
2792 if (optlen
< sizeof(int))
2794 if (get_user(val
, (int __user
*)optval
))
2797 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2803 * 7.1.1 SCTP_RTOINFO
2805 * The protocol parameters used to initialize and bound retransmission
2806 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2807 * and modify these parameters.
2808 * All parameters are time values, in milliseconds. A value of 0, when
2809 * modifying the parameters, indicates that the current value should not
2813 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2815 struct sctp_rtoinfo rtoinfo
;
2816 struct sctp_association
*asoc
;
2817 unsigned long rto_min
, rto_max
;
2818 struct sctp_sock
*sp
= sctp_sk(sk
);
2820 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2823 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2826 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2828 /* Set the values to the specific association */
2829 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2832 rto_max
= rtoinfo
.srto_max
;
2833 rto_min
= rtoinfo
.srto_min
;
2836 rto_max
= asoc
? msecs_to_jiffies(rto_max
) : rto_max
;
2838 rto_max
= asoc
? asoc
->rto_max
: sp
->rtoinfo
.srto_max
;
2841 rto_min
= asoc
? msecs_to_jiffies(rto_min
) : rto_min
;
2843 rto_min
= asoc
? asoc
->rto_min
: sp
->rtoinfo
.srto_min
;
2845 if (rto_min
> rto_max
)
2849 if (rtoinfo
.srto_initial
!= 0)
2851 msecs_to_jiffies(rtoinfo
.srto_initial
);
2852 asoc
->rto_max
= rto_max
;
2853 asoc
->rto_min
= rto_min
;
2855 /* If there is no association or the association-id = 0
2856 * set the values to the endpoint.
2858 if (rtoinfo
.srto_initial
!= 0)
2859 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2860 sp
->rtoinfo
.srto_max
= rto_max
;
2861 sp
->rtoinfo
.srto_min
= rto_min
;
2869 * 7.1.2 SCTP_ASSOCINFO
2871 * This option is used to tune the maximum retransmission attempts
2872 * of the association.
2873 * Returns an error if the new association retransmission value is
2874 * greater than the sum of the retransmission value of the peer.
2875 * See [SCTP] for more information.
2878 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2881 struct sctp_assocparams assocparams
;
2882 struct sctp_association
*asoc
;
2884 if (optlen
!= sizeof(struct sctp_assocparams
))
2886 if (copy_from_user(&assocparams
, optval
, optlen
))
2889 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2891 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2894 /* Set the values to the specific association */
2896 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2899 struct sctp_transport
*peer_addr
;
2901 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
2903 path_sum
+= peer_addr
->pathmaxrxt
;
2907 /* Only validate asocmaxrxt if we have more than
2908 * one path/transport. We do this because path
2909 * retransmissions are only counted when we have more
2913 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2916 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2919 if (assocparams
.sasoc_cookie_life
!= 0)
2920 asoc
->cookie_life
= ms_to_ktime(assocparams
.sasoc_cookie_life
);
2922 /* Set the values to the endpoint */
2923 struct sctp_sock
*sp
= sctp_sk(sk
);
2925 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2926 sp
->assocparams
.sasoc_asocmaxrxt
=
2927 assocparams
.sasoc_asocmaxrxt
;
2928 if (assocparams
.sasoc_cookie_life
!= 0)
2929 sp
->assocparams
.sasoc_cookie_life
=
2930 assocparams
.sasoc_cookie_life
;
2936 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2938 * This socket option is a boolean flag which turns on or off mapped V4
2939 * addresses. If this option is turned on and the socket is type
2940 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2941 * If this option is turned off, then no mapping will be done of V4
2942 * addresses and a user will receive both PF_INET6 and PF_INET type
2943 * addresses on the socket.
2945 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2948 struct sctp_sock
*sp
= sctp_sk(sk
);
2950 if (optlen
< sizeof(int))
2952 if (get_user(val
, (int __user
*)optval
))
2963 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2964 * This option will get or set the maximum size to put in any outgoing
2965 * SCTP DATA chunk. If a message is larger than this size it will be
2966 * fragmented by SCTP into the specified size. Note that the underlying
2967 * SCTP implementation may fragment into smaller sized chunks when the
2968 * PMTU of the underlying association is smaller than the value set by
2969 * the user. The default value for this option is '0' which indicates
2970 * the user is NOT limiting fragmentation and only the PMTU will effect
2971 * SCTP's choice of DATA chunk size. Note also that values set larger
2972 * than the maximum size of an IP datagram will effectively let SCTP
2973 * control fragmentation (i.e. the same as setting this option to 0).
2975 * The following structure is used to access and modify this parameter:
2977 * struct sctp_assoc_value {
2978 * sctp_assoc_t assoc_id;
2979 * uint32_t assoc_value;
2982 * assoc_id: This parameter is ignored for one-to-one style sockets.
2983 * For one-to-many style sockets this parameter indicates which
2984 * association the user is performing an action upon. Note that if
2985 * this field's value is zero then the endpoints default value is
2986 * changed (effecting future associations only).
2987 * assoc_value: This parameter specifies the maximum size in bytes.
2989 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2991 struct sctp_assoc_value params
;
2992 struct sctp_association
*asoc
;
2993 struct sctp_sock
*sp
= sctp_sk(sk
);
2996 if (optlen
== sizeof(int)) {
2997 pr_warn("Use of int in maxseg socket option deprecated\n");
2998 pr_warn("Use struct sctp_assoc_value instead\n");
2999 if (copy_from_user(&val
, optval
, optlen
))
3001 params
.assoc_id
= 0;
3002 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3003 if (copy_from_user(¶ms
, optval
, optlen
))
3005 val
= params
.assoc_value
;
3009 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
3012 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3013 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
3018 val
= asoc
->pathmtu
;
3019 val
-= sp
->pf
->af
->net_header_len
;
3020 val
-= sizeof(struct sctphdr
) +
3021 sizeof(struct sctp_data_chunk
);
3023 asoc
->user_frag
= val
;
3024 asoc
->frag_point
= sctp_frag_point(asoc
, asoc
->pathmtu
);
3026 sp
->user_frag
= val
;
3034 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3036 * Requests that the peer mark the enclosed address as the association
3037 * primary. The enclosed address must be one of the association's
3038 * locally bound addresses. The following structure is used to make a
3039 * set primary request:
3041 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
3042 unsigned int optlen
)
3044 struct net
*net
= sock_net(sk
);
3045 struct sctp_sock
*sp
;
3046 struct sctp_association
*asoc
= NULL
;
3047 struct sctp_setpeerprim prim
;
3048 struct sctp_chunk
*chunk
;
3054 if (!net
->sctp
.addip_enable
)
3057 if (optlen
!= sizeof(struct sctp_setpeerprim
))
3060 if (copy_from_user(&prim
, optval
, optlen
))
3063 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
3067 if (!asoc
->peer
.asconf_capable
)
3070 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
3073 if (!sctp_state(asoc
, ESTABLISHED
))
3076 af
= sctp_get_af_specific(prim
.sspp_addr
.ss_family
);
3080 if (!af
->addr_valid((union sctp_addr
*)&prim
.sspp_addr
, sp
, NULL
))
3081 return -EADDRNOTAVAIL
;
3083 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
3084 return -EADDRNOTAVAIL
;
3086 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3087 chunk
= sctp_make_asconf_set_prim(asoc
,
3088 (union sctp_addr
*)&prim
.sspp_addr
);
3092 err
= sctp_send_asconf(asoc
, chunk
);
3094 pr_debug("%s: we set peer primary addr primitively\n", __func__
);
3099 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
3100 unsigned int optlen
)
3102 struct sctp_setadaptation adaptation
;
3104 if (optlen
!= sizeof(struct sctp_setadaptation
))
3106 if (copy_from_user(&adaptation
, optval
, optlen
))
3109 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
3115 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3117 * The context field in the sctp_sndrcvinfo structure is normally only
3118 * used when a failed message is retrieved holding the value that was
3119 * sent down on the actual send call. This option allows the setting of
3120 * a default context on an association basis that will be received on
3121 * reading messages from the peer. This is especially helpful in the
3122 * one-2-many model for an application to keep some reference to an
3123 * internal state machine that is processing messages on the
3124 * association. Note that the setting of this value only effects
3125 * received messages from the peer and does not effect the value that is
3126 * saved with outbound messages.
3128 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
3129 unsigned int optlen
)
3131 struct sctp_assoc_value params
;
3132 struct sctp_sock
*sp
;
3133 struct sctp_association
*asoc
;
3135 if (optlen
!= sizeof(struct sctp_assoc_value
))
3137 if (copy_from_user(¶ms
, optval
, optlen
))
3142 if (params
.assoc_id
!= 0) {
3143 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3146 asoc
->default_rcv_context
= params
.assoc_value
;
3148 sp
->default_rcv_context
= params
.assoc_value
;
3155 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3157 * This options will at a minimum specify if the implementation is doing
3158 * fragmented interleave. Fragmented interleave, for a one to many
3159 * socket, is when subsequent calls to receive a message may return
3160 * parts of messages from different associations. Some implementations
3161 * may allow you to turn this value on or off. If so, when turned off,
3162 * no fragment interleave will occur (which will cause a head of line
3163 * blocking amongst multiple associations sharing the same one to many
3164 * socket). When this option is turned on, then each receive call may
3165 * come from a different association (thus the user must receive data
3166 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3167 * association each receive belongs to.
3169 * This option takes a boolean value. A non-zero value indicates that
3170 * fragmented interleave is on. A value of zero indicates that
3171 * fragmented interleave is off.
3173 * Note that it is important that an implementation that allows this
3174 * option to be turned on, have it off by default. Otherwise an unaware
3175 * application using the one to many model may become confused and act
3178 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
3179 char __user
*optval
,
3180 unsigned int optlen
)
3184 if (optlen
!= sizeof(int))
3186 if (get_user(val
, (int __user
*)optval
))
3189 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
3195 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3196 * (SCTP_PARTIAL_DELIVERY_POINT)
3198 * This option will set or get the SCTP partial delivery point. This
3199 * point is the size of a message where the partial delivery API will be
3200 * invoked to help free up rwnd space for the peer. Setting this to a
3201 * lower value will cause partial deliveries to happen more often. The
3202 * calls argument is an integer that sets or gets the partial delivery
3203 * point. Note also that the call will fail if the user attempts to set
3204 * this value larger than the socket receive buffer size.
3206 * Note that any single message having a length smaller than or equal to
3207 * the SCTP partial delivery point will be delivered in one single read
3208 * call as long as the user provided buffer is large enough to hold the
3211 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
3212 char __user
*optval
,
3213 unsigned int optlen
)
3217 if (optlen
!= sizeof(u32
))
3219 if (get_user(val
, (int __user
*)optval
))
3222 /* Note: We double the receive buffer from what the user sets
3223 * it to be, also initial rwnd is based on rcvbuf/2.
3225 if (val
> (sk
->sk_rcvbuf
>> 1))
3228 sctp_sk(sk
)->pd_point
= val
;
3230 return 0; /* is this the right error code? */
3234 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3236 * This option will allow a user to change the maximum burst of packets
3237 * that can be emitted by this association. Note that the default value
3238 * is 4, and some implementations may restrict this setting so that it
3239 * can only be lowered.
3241 * NOTE: This text doesn't seem right. Do this on a socket basis with
3242 * future associations inheriting the socket value.
3244 static int sctp_setsockopt_maxburst(struct sock
*sk
,
3245 char __user
*optval
,
3246 unsigned int optlen
)
3248 struct sctp_assoc_value params
;
3249 struct sctp_sock
*sp
;
3250 struct sctp_association
*asoc
;
3254 if (optlen
== sizeof(int)) {
3255 pr_warn("Use of int in max_burst socket option deprecated\n");
3256 pr_warn("Use struct sctp_assoc_value instead\n");
3257 if (copy_from_user(&val
, optval
, optlen
))
3259 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3260 if (copy_from_user(¶ms
, optval
, optlen
))
3262 val
= params
.assoc_value
;
3263 assoc_id
= params
.assoc_id
;
3269 if (assoc_id
!= 0) {
3270 asoc
= sctp_id2assoc(sk
, assoc_id
);
3273 asoc
->max_burst
= val
;
3275 sp
->max_burst
= val
;
3281 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3283 * This set option adds a chunk type that the user is requesting to be
3284 * received only in an authenticated way. Changes to the list of chunks
3285 * will only effect future associations on the socket.
3287 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
3288 char __user
*optval
,
3289 unsigned int optlen
)
3291 struct net
*net
= sock_net(sk
);
3292 struct sctp_authchunk val
;
3294 if (!net
->sctp
.auth_enable
)
3297 if (optlen
!= sizeof(struct sctp_authchunk
))
3299 if (copy_from_user(&val
, optval
, optlen
))
3302 switch (val
.sauth_chunk
) {
3304 case SCTP_CID_INIT_ACK
:
3305 case SCTP_CID_SHUTDOWN_COMPLETE
:
3310 /* add this chunk id to the endpoint */
3311 return sctp_auth_ep_add_chunkid(sctp_sk(sk
)->ep
, val
.sauth_chunk
);
3315 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3317 * This option gets or sets the list of HMAC algorithms that the local
3318 * endpoint requires the peer to use.
3320 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
3321 char __user
*optval
,
3322 unsigned int optlen
)
3324 struct net
*net
= sock_net(sk
);
3325 struct sctp_hmacalgo
*hmacs
;
3329 if (!net
->sctp
.auth_enable
)
3332 if (optlen
< sizeof(struct sctp_hmacalgo
))
3335 hmacs
= memdup_user(optval
, optlen
);
3337 return PTR_ERR(hmacs
);
3339 idents
= hmacs
->shmac_num_idents
;
3340 if (idents
== 0 || idents
> SCTP_AUTH_NUM_HMACS
||
3341 (idents
* sizeof(u16
)) > (optlen
- sizeof(struct sctp_hmacalgo
))) {
3346 err
= sctp_auth_ep_set_hmacs(sctp_sk(sk
)->ep
, hmacs
);
3353 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3355 * This option will set a shared secret key which is used to build an
3356 * association shared key.
3358 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3359 char __user
*optval
,
3360 unsigned int optlen
)
3362 struct net
*net
= sock_net(sk
);
3363 struct sctp_authkey
*authkey
;
3364 struct sctp_association
*asoc
;
3367 if (!net
->sctp
.auth_enable
)
3370 if (optlen
<= sizeof(struct sctp_authkey
))
3373 authkey
= memdup_user(optval
, optlen
);
3374 if (IS_ERR(authkey
))
3375 return PTR_ERR(authkey
);
3377 if (authkey
->sca_keylength
> optlen
- sizeof(struct sctp_authkey
)) {
3382 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3383 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3388 ret
= sctp_auth_set_key(sctp_sk(sk
)->ep
, asoc
, authkey
);
3395 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3397 * This option will get or set the active shared key to be used to build
3398 * the association shared key.
3400 static int sctp_setsockopt_active_key(struct sock
*sk
,
3401 char __user
*optval
,
3402 unsigned int optlen
)
3404 struct net
*net
= sock_net(sk
);
3405 struct sctp_authkeyid val
;
3406 struct sctp_association
*asoc
;
3408 if (!net
->sctp
.auth_enable
)
3411 if (optlen
!= sizeof(struct sctp_authkeyid
))
3413 if (copy_from_user(&val
, optval
, optlen
))
3416 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3417 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3420 return sctp_auth_set_active_key(sctp_sk(sk
)->ep
, asoc
,
3421 val
.scact_keynumber
);
3425 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3427 * This set option will delete a shared secret key from use.
3429 static int sctp_setsockopt_del_key(struct sock
*sk
,
3430 char __user
*optval
,
3431 unsigned int optlen
)
3433 struct net
*net
= sock_net(sk
);
3434 struct sctp_authkeyid val
;
3435 struct sctp_association
*asoc
;
3437 if (!net
->sctp
.auth_enable
)
3440 if (optlen
!= sizeof(struct sctp_authkeyid
))
3442 if (copy_from_user(&val
, optval
, optlen
))
3445 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3446 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3449 return sctp_auth_del_key_id(sctp_sk(sk
)->ep
, asoc
,
3450 val
.scact_keynumber
);
3455 * 8.1.23 SCTP_AUTO_ASCONF
3457 * This option will enable or disable the use of the automatic generation of
3458 * ASCONF chunks to add and delete addresses to an existing association. Note
3459 * that this option has two caveats namely: a) it only affects sockets that
3460 * are bound to all addresses available to the SCTP stack, and b) the system
3461 * administrator may have an overriding control that turns the ASCONF feature
3462 * off no matter what setting the socket option may have.
3463 * This option expects an integer boolean flag, where a non-zero value turns on
3464 * the option, and a zero value turns off the option.
3465 * Note. In this implementation, socket operation overrides default parameter
3466 * being set by sysctl as well as FreeBSD implementation
3468 static int sctp_setsockopt_auto_asconf(struct sock
*sk
, char __user
*optval
,
3469 unsigned int optlen
)
3472 struct sctp_sock
*sp
= sctp_sk(sk
);
3474 if (optlen
< sizeof(int))
3476 if (get_user(val
, (int __user
*)optval
))
3478 if (!sctp_is_ep_boundall(sk
) && val
)
3480 if ((val
&& sp
->do_auto_asconf
) || (!val
&& !sp
->do_auto_asconf
))
3483 if (val
== 0 && sp
->do_auto_asconf
) {
3484 list_del(&sp
->auto_asconf_list
);
3485 sp
->do_auto_asconf
= 0;
3486 } else if (val
&& !sp
->do_auto_asconf
) {
3487 list_add_tail(&sp
->auto_asconf_list
,
3488 &sock_net(sk
)->sctp
.auto_asconf_splist
);
3489 sp
->do_auto_asconf
= 1;
3496 * SCTP_PEER_ADDR_THLDS
3498 * This option allows us to alter the partially failed threshold for one or all
3499 * transports in an association. See Section 6.1 of:
3500 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3502 static int sctp_setsockopt_paddr_thresholds(struct sock
*sk
,
3503 char __user
*optval
,
3504 unsigned int optlen
)
3506 struct sctp_paddrthlds val
;
3507 struct sctp_transport
*trans
;
3508 struct sctp_association
*asoc
;
3510 if (optlen
< sizeof(struct sctp_paddrthlds
))
3512 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
,
3513 sizeof(struct sctp_paddrthlds
)))
3517 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
3518 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
3521 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
3523 if (val
.spt_pathmaxrxt
)
3524 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3525 trans
->pf_retrans
= val
.spt_pathpfthld
;
3528 if (val
.spt_pathmaxrxt
)
3529 asoc
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3530 asoc
->pf_retrans
= val
.spt_pathpfthld
;
3532 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
3537 if (val
.spt_pathmaxrxt
)
3538 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3539 trans
->pf_retrans
= val
.spt_pathpfthld
;
3545 /* API 6.2 setsockopt(), getsockopt()
3547 * Applications use setsockopt() and getsockopt() to set or retrieve
3548 * socket options. Socket options are used to change the default
3549 * behavior of sockets calls. They are described in Section 7.
3553 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3554 * int __user *optlen);
3555 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3558 * sd - the socket descript.
3559 * level - set to IPPROTO_SCTP for all SCTP options.
3560 * optname - the option name.
3561 * optval - the buffer to store the value of the option.
3562 * optlen - the size of the buffer.
3564 static int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3565 char __user
*optval
, unsigned int optlen
)
3569 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
3571 /* I can hardly begin to describe how wrong this is. This is
3572 * so broken as to be worse than useless. The API draft
3573 * REALLY is NOT helpful here... I am not convinced that the
3574 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3575 * are at all well-founded.
3577 if (level
!= SOL_SCTP
) {
3578 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3579 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3586 case SCTP_SOCKOPT_BINDX_ADD
:
3587 /* 'optlen' is the size of the addresses buffer. */
3588 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3589 optlen
, SCTP_BINDX_ADD_ADDR
);
3592 case SCTP_SOCKOPT_BINDX_REM
:
3593 /* 'optlen' is the size of the addresses buffer. */
3594 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3595 optlen
, SCTP_BINDX_REM_ADDR
);
3598 case SCTP_SOCKOPT_CONNECTX_OLD
:
3599 /* 'optlen' is the size of the addresses buffer. */
3600 retval
= sctp_setsockopt_connectx_old(sk
,
3601 (struct sockaddr __user
*)optval
,
3605 case SCTP_SOCKOPT_CONNECTX
:
3606 /* 'optlen' is the size of the addresses buffer. */
3607 retval
= sctp_setsockopt_connectx(sk
,
3608 (struct sockaddr __user
*)optval
,
3612 case SCTP_DISABLE_FRAGMENTS
:
3613 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3617 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3620 case SCTP_AUTOCLOSE
:
3621 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3624 case SCTP_PEER_ADDR_PARAMS
:
3625 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3628 case SCTP_DELAYED_SACK
:
3629 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3631 case SCTP_PARTIAL_DELIVERY_POINT
:
3632 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3636 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3638 case SCTP_DEFAULT_SEND_PARAM
:
3639 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3642 case SCTP_PRIMARY_ADDR
:
3643 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3645 case SCTP_SET_PEER_PRIMARY_ADDR
:
3646 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3649 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3652 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3654 case SCTP_ASSOCINFO
:
3655 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3657 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3658 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3661 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3663 case SCTP_ADAPTATION_LAYER
:
3664 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3667 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3669 case SCTP_FRAGMENT_INTERLEAVE
:
3670 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3672 case SCTP_MAX_BURST
:
3673 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3675 case SCTP_AUTH_CHUNK
:
3676 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3678 case SCTP_HMAC_IDENT
:
3679 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3682 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3684 case SCTP_AUTH_ACTIVE_KEY
:
3685 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3687 case SCTP_AUTH_DELETE_KEY
:
3688 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3690 case SCTP_AUTO_ASCONF
:
3691 retval
= sctp_setsockopt_auto_asconf(sk
, optval
, optlen
);
3693 case SCTP_PEER_ADDR_THLDS
:
3694 retval
= sctp_setsockopt_paddr_thresholds(sk
, optval
, optlen
);
3697 retval
= -ENOPROTOOPT
;
3701 sctp_release_sock(sk
);
3707 /* API 3.1.6 connect() - UDP Style Syntax
3709 * An application may use the connect() call in the UDP model to initiate an
3710 * association without sending data.
3714 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3716 * sd: the socket descriptor to have a new association added to.
3718 * nam: the address structure (either struct sockaddr_in or struct
3719 * sockaddr_in6 defined in RFC2553 [7]).
3721 * len: the size of the address.
3723 static int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3731 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__
, sk
,
3734 /* Validate addr_len before calling common connect/connectx routine. */
3735 af
= sctp_get_af_specific(addr
->sa_family
);
3736 if (!af
|| addr_len
< af
->sockaddr_len
) {
3739 /* Pass correct addr len to common routine (so it knows there
3740 * is only one address being passed.
3742 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
3745 sctp_release_sock(sk
);
3749 /* FIXME: Write comments. */
3750 static int sctp_disconnect(struct sock
*sk
, int flags
)
3752 return -EOPNOTSUPP
; /* STUB */
3755 /* 4.1.4 accept() - TCP Style Syntax
3757 * Applications use accept() call to remove an established SCTP
3758 * association from the accept queue of the endpoint. A new socket
3759 * descriptor will be returned from accept() to represent the newly
3760 * formed association.
3762 static struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3764 struct sctp_sock
*sp
;
3765 struct sctp_endpoint
*ep
;
3766 struct sock
*newsk
= NULL
;
3767 struct sctp_association
*asoc
;
3776 if (!sctp_style(sk
, TCP
)) {
3777 error
= -EOPNOTSUPP
;
3781 if (!sctp_sstate(sk
, LISTENING
)) {
3786 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3788 error
= sctp_wait_for_accept(sk
, timeo
);
3792 /* We treat the list of associations on the endpoint as the accept
3793 * queue and pick the first association on the list.
3795 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3797 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3803 /* Populate the fields of the newsk from the oldsk and migrate the
3804 * asoc to the newsk.
3806 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3809 sctp_release_sock(sk
);
3814 /* The SCTP ioctl handler. */
3815 static int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3822 * SEQPACKET-style sockets in LISTENING state are valid, for
3823 * SCTP, so only discard TCP-style sockets in LISTENING state.
3825 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
3830 struct sk_buff
*skb
;
3831 unsigned int amount
= 0;
3833 skb
= skb_peek(&sk
->sk_receive_queue
);
3836 * We will only return the amount of this packet since
3837 * that is all that will be read.
3841 rc
= put_user(amount
, (int __user
*)arg
);
3849 sctp_release_sock(sk
);
3853 /* This is the function which gets called during socket creation to
3854 * initialized the SCTP-specific portion of the sock.
3855 * The sock structure should already be zero-filled memory.
3857 static int sctp_init_sock(struct sock
*sk
)
3859 struct net
*net
= sock_net(sk
);
3860 struct sctp_sock
*sp
;
3862 pr_debug("%s: sk:%p\n", __func__
, sk
);
3866 /* Initialize the SCTP per socket area. */
3867 switch (sk
->sk_type
) {
3868 case SOCK_SEQPACKET
:
3869 sp
->type
= SCTP_SOCKET_UDP
;
3872 sp
->type
= SCTP_SOCKET_TCP
;
3875 return -ESOCKTNOSUPPORT
;
3878 /* Initialize default send parameters. These parameters can be
3879 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3881 sp
->default_stream
= 0;
3882 sp
->default_ppid
= 0;
3883 sp
->default_flags
= 0;
3884 sp
->default_context
= 0;
3885 sp
->default_timetolive
= 0;
3887 sp
->default_rcv_context
= 0;
3888 sp
->max_burst
= net
->sctp
.max_burst
;
3890 sp
->sctp_hmac_alg
= net
->sctp
.sctp_hmac_alg
;
3892 /* Initialize default setup parameters. These parameters
3893 * can be modified with the SCTP_INITMSG socket option or
3894 * overridden by the SCTP_INIT CMSG.
3896 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3897 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3898 sp
->initmsg
.sinit_max_attempts
= net
->sctp
.max_retrans_init
;
3899 sp
->initmsg
.sinit_max_init_timeo
= net
->sctp
.rto_max
;
3901 /* Initialize default RTO related parameters. These parameters can
3902 * be modified for with the SCTP_RTOINFO socket option.
3904 sp
->rtoinfo
.srto_initial
= net
->sctp
.rto_initial
;
3905 sp
->rtoinfo
.srto_max
= net
->sctp
.rto_max
;
3906 sp
->rtoinfo
.srto_min
= net
->sctp
.rto_min
;
3908 /* Initialize default association related parameters. These parameters
3909 * can be modified with the SCTP_ASSOCINFO socket option.
3911 sp
->assocparams
.sasoc_asocmaxrxt
= net
->sctp
.max_retrans_association
;
3912 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3913 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3914 sp
->assocparams
.sasoc_local_rwnd
= 0;
3915 sp
->assocparams
.sasoc_cookie_life
= net
->sctp
.valid_cookie_life
;
3917 /* Initialize default event subscriptions. By default, all the
3920 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3922 /* Default Peer Address Parameters. These defaults can
3923 * be modified via SCTP_PEER_ADDR_PARAMS
3925 sp
->hbinterval
= net
->sctp
.hb_interval
;
3926 sp
->pathmaxrxt
= net
->sctp
.max_retrans_path
;
3927 sp
->pathmtu
= 0; /* allow default discovery */
3928 sp
->sackdelay
= net
->sctp
.sack_timeout
;
3930 sp
->param_flags
= SPP_HB_ENABLE
|
3932 SPP_SACKDELAY_ENABLE
;
3934 /* If enabled no SCTP message fragmentation will be performed.
3935 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3937 sp
->disable_fragments
= 0;
3939 /* Enable Nagle algorithm by default. */
3942 /* Enable by default. */
3945 /* Auto-close idle associations after the configured
3946 * number of seconds. A value of 0 disables this
3947 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3948 * for UDP-style sockets only.
3952 /* User specified fragmentation limit. */
3955 sp
->adaptation_ind
= 0;
3957 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3959 /* Control variables for partial data delivery. */
3960 atomic_set(&sp
->pd_mode
, 0);
3961 skb_queue_head_init(&sp
->pd_lobby
);
3962 sp
->frag_interleave
= 0;
3964 /* Create a per socket endpoint structure. Even if we
3965 * change the data structure relationships, this may still
3966 * be useful for storing pre-connect address information.
3968 sp
->ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3974 sk
->sk_destruct
= sctp_destruct_sock
;
3976 SCTP_DBG_OBJCNT_INC(sock
);
3979 percpu_counter_inc(&sctp_sockets_allocated
);
3980 sock_prot_inuse_add(net
, sk
->sk_prot
, 1);
3981 if (net
->sctp
.default_auto_asconf
) {
3982 list_add_tail(&sp
->auto_asconf_list
,
3983 &net
->sctp
.auto_asconf_splist
);
3984 sp
->do_auto_asconf
= 1;
3986 sp
->do_auto_asconf
= 0;
3992 /* Cleanup any SCTP per socket resources. */
3993 static void sctp_destroy_sock(struct sock
*sk
)
3995 struct sctp_sock
*sp
;
3997 pr_debug("%s: sk:%p\n", __func__
, sk
);
3999 /* Release our hold on the endpoint. */
4001 /* This could happen during socket init, thus we bail out
4002 * early, since the rest of the below is not setup either.
4007 if (sp
->do_auto_asconf
) {
4008 sp
->do_auto_asconf
= 0;
4009 list_del(&sp
->auto_asconf_list
);
4011 sctp_endpoint_free(sp
->ep
);
4013 percpu_counter_dec(&sctp_sockets_allocated
);
4014 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
4018 /* Triggered when there are no references on the socket anymore */
4019 static void sctp_destruct_sock(struct sock
*sk
)
4021 struct sctp_sock
*sp
= sctp_sk(sk
);
4023 /* Free up the HMAC transform. */
4024 crypto_free_hash(sp
->hmac
);
4026 inet_sock_destruct(sk
);
4029 /* API 4.1.7 shutdown() - TCP Style Syntax
4030 * int shutdown(int socket, int how);
4032 * sd - the socket descriptor of the association to be closed.
4033 * how - Specifies the type of shutdown. The values are
4036 * Disables further receive operations. No SCTP
4037 * protocol action is taken.
4039 * Disables further send operations, and initiates
4040 * the SCTP shutdown sequence.
4042 * Disables further send and receive operations
4043 * and initiates the SCTP shutdown sequence.
4045 static void sctp_shutdown(struct sock
*sk
, int how
)
4047 struct net
*net
= sock_net(sk
);
4048 struct sctp_endpoint
*ep
;
4049 struct sctp_association
*asoc
;
4051 if (!sctp_style(sk
, TCP
))
4054 if (how
& SEND_SHUTDOWN
) {
4055 ep
= sctp_sk(sk
)->ep
;
4056 if (!list_empty(&ep
->asocs
)) {
4057 asoc
= list_entry(ep
->asocs
.next
,
4058 struct sctp_association
, asocs
);
4059 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
4064 /* 7.2.1 Association Status (SCTP_STATUS)
4066 * Applications can retrieve current status information about an
4067 * association, including association state, peer receiver window size,
4068 * number of unacked data chunks, and number of data chunks pending
4069 * receipt. This information is read-only.
4071 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
4072 char __user
*optval
,
4075 struct sctp_status status
;
4076 struct sctp_association
*asoc
= NULL
;
4077 struct sctp_transport
*transport
;
4078 sctp_assoc_t associd
;
4081 if (len
< sizeof(status
)) {
4086 len
= sizeof(status
);
4087 if (copy_from_user(&status
, optval
, len
)) {
4092 associd
= status
.sstat_assoc_id
;
4093 asoc
= sctp_id2assoc(sk
, associd
);
4099 transport
= asoc
->peer
.primary_path
;
4101 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
4102 status
.sstat_state
= asoc
->state
;
4103 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
4104 status
.sstat_unackdata
= asoc
->unack_data
;
4106 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4107 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
4108 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
4109 status
.sstat_fragmentation_point
= asoc
->frag_point
;
4110 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4111 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
4112 transport
->af_specific
->sockaddr_len
);
4113 /* Map ipv4 address into v4-mapped-on-v6 address. */
4114 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4115 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
4116 status
.sstat_primary
.spinfo_state
= transport
->state
;
4117 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
4118 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
4119 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4120 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
4122 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
4123 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
4125 if (put_user(len
, optlen
)) {
4130 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4131 __func__
, len
, status
.sstat_state
, status
.sstat_rwnd
,
4132 status
.sstat_assoc_id
);
4134 if (copy_to_user(optval
, &status
, len
)) {
4144 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4146 * Applications can retrieve information about a specific peer address
4147 * of an association, including its reachability state, congestion
4148 * window, and retransmission timer values. This information is
4151 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
4152 char __user
*optval
,
4155 struct sctp_paddrinfo pinfo
;
4156 struct sctp_transport
*transport
;
4159 if (len
< sizeof(pinfo
)) {
4164 len
= sizeof(pinfo
);
4165 if (copy_from_user(&pinfo
, optval
, len
)) {
4170 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
4171 pinfo
.spinfo_assoc_id
);
4175 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4176 pinfo
.spinfo_state
= transport
->state
;
4177 pinfo
.spinfo_cwnd
= transport
->cwnd
;
4178 pinfo
.spinfo_srtt
= transport
->srtt
;
4179 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4180 pinfo
.spinfo_mtu
= transport
->pathmtu
;
4182 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
4183 pinfo
.spinfo_state
= SCTP_ACTIVE
;
4185 if (put_user(len
, optlen
)) {
4190 if (copy_to_user(optval
, &pinfo
, len
)) {
4199 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4201 * This option is a on/off flag. If enabled no SCTP message
4202 * fragmentation will be performed. Instead if a message being sent
4203 * exceeds the current PMTU size, the message will NOT be sent and
4204 * instead a error will be indicated to the user.
4206 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
4207 char __user
*optval
, int __user
*optlen
)
4211 if (len
< sizeof(int))
4215 val
= (sctp_sk(sk
)->disable_fragments
== 1);
4216 if (put_user(len
, optlen
))
4218 if (copy_to_user(optval
, &val
, len
))
4223 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4225 * This socket option is used to specify various notifications and
4226 * ancillary data the user wishes to receive.
4228 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
4233 if (len
> sizeof(struct sctp_event_subscribe
))
4234 len
= sizeof(struct sctp_event_subscribe
);
4235 if (put_user(len
, optlen
))
4237 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
4242 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4244 * This socket option is applicable to the UDP-style socket only. When
4245 * set it will cause associations that are idle for more than the
4246 * specified number of seconds to automatically close. An association
4247 * being idle is defined an association that has NOT sent or received
4248 * user data. The special value of '0' indicates that no automatic
4249 * close of any associations should be performed. The option expects an
4250 * integer defining the number of seconds of idle time before an
4251 * association is closed.
4253 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4255 /* Applicable to UDP-style socket only */
4256 if (sctp_style(sk
, TCP
))
4258 if (len
< sizeof(int))
4261 if (put_user(len
, optlen
))
4263 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
4268 /* Helper routine to branch off an association to a new socket. */
4269 int sctp_do_peeloff(struct sock
*sk
, sctp_assoc_t id
, struct socket
**sockp
)
4271 struct sctp_association
*asoc
= sctp_id2assoc(sk
, id
);
4272 struct socket
*sock
;
4279 /* An association cannot be branched off from an already peeled-off
4280 * socket, nor is this supported for tcp style sockets.
4282 if (!sctp_style(sk
, UDP
))
4285 /* Create a new socket. */
4286 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
4290 sctp_copy_sock(sock
->sk
, sk
, asoc
);
4292 /* Make peeled-off sockets more like 1-1 accepted sockets.
4293 * Set the daddr and initialize id to something more random
4295 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
4296 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
4298 /* Populate the fields of the newsk from the oldsk and migrate the
4299 * asoc to the newsk.
4301 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
4307 EXPORT_SYMBOL(sctp_do_peeloff
);
4309 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4311 sctp_peeloff_arg_t peeloff
;
4312 struct socket
*newsock
;
4313 struct file
*newfile
;
4316 if (len
< sizeof(sctp_peeloff_arg_t
))
4318 len
= sizeof(sctp_peeloff_arg_t
);
4319 if (copy_from_user(&peeloff
, optval
, len
))
4322 retval
= sctp_do_peeloff(sk
, peeloff
.associd
, &newsock
);
4326 /* Map the socket to an unused fd that can be returned to the user. */
4327 retval
= get_unused_fd_flags(0);
4329 sock_release(newsock
);
4333 newfile
= sock_alloc_file(newsock
, 0, NULL
);
4334 if (unlikely(IS_ERR(newfile
))) {
4335 put_unused_fd(retval
);
4336 sock_release(newsock
);
4337 return PTR_ERR(newfile
);
4340 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__
, sk
, newsock
->sk
,
4343 /* Return the fd mapped to the new socket. */
4344 if (put_user(len
, optlen
)) {
4346 put_unused_fd(retval
);
4349 peeloff
.sd
= retval
;
4350 if (copy_to_user(optval
, &peeloff
, len
)) {
4352 put_unused_fd(retval
);
4355 fd_install(retval
, newfile
);
4360 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4362 * Applications can enable or disable heartbeats for any peer address of
4363 * an association, modify an address's heartbeat interval, force a
4364 * heartbeat to be sent immediately, and adjust the address's maximum
4365 * number of retransmissions sent before an address is considered
4366 * unreachable. The following structure is used to access and modify an
4367 * address's parameters:
4369 * struct sctp_paddrparams {
4370 * sctp_assoc_t spp_assoc_id;
4371 * struct sockaddr_storage spp_address;
4372 * uint32_t spp_hbinterval;
4373 * uint16_t spp_pathmaxrxt;
4374 * uint32_t spp_pathmtu;
4375 * uint32_t spp_sackdelay;
4376 * uint32_t spp_flags;
4379 * spp_assoc_id - (one-to-many style socket) This is filled in the
4380 * application, and identifies the association for
4382 * spp_address - This specifies which address is of interest.
4383 * spp_hbinterval - This contains the value of the heartbeat interval,
4384 * in milliseconds. If a value of zero
4385 * is present in this field then no changes are to
4386 * be made to this parameter.
4387 * spp_pathmaxrxt - This contains the maximum number of
4388 * retransmissions before this address shall be
4389 * considered unreachable. If a value of zero
4390 * is present in this field then no changes are to
4391 * be made to this parameter.
4392 * spp_pathmtu - When Path MTU discovery is disabled the value
4393 * specified here will be the "fixed" path mtu.
4394 * Note that if the spp_address field is empty
4395 * then all associations on this address will
4396 * have this fixed path mtu set upon them.
4398 * spp_sackdelay - When delayed sack is enabled, this value specifies
4399 * the number of milliseconds that sacks will be delayed
4400 * for. This value will apply to all addresses of an
4401 * association if the spp_address field is empty. Note
4402 * also, that if delayed sack is enabled and this
4403 * value is set to 0, no change is made to the last
4404 * recorded delayed sack timer value.
4406 * spp_flags - These flags are used to control various features
4407 * on an association. The flag field may contain
4408 * zero or more of the following options.
4410 * SPP_HB_ENABLE - Enable heartbeats on the
4411 * specified address. Note that if the address
4412 * field is empty all addresses for the association
4413 * have heartbeats enabled upon them.
4415 * SPP_HB_DISABLE - Disable heartbeats on the
4416 * speicifed address. Note that if the address
4417 * field is empty all addresses for the association
4418 * will have their heartbeats disabled. Note also
4419 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4420 * mutually exclusive, only one of these two should
4421 * be specified. Enabling both fields will have
4422 * undetermined results.
4424 * SPP_HB_DEMAND - Request a user initiated heartbeat
4425 * to be made immediately.
4427 * SPP_PMTUD_ENABLE - This field will enable PMTU
4428 * discovery upon the specified address. Note that
4429 * if the address feild is empty then all addresses
4430 * on the association are effected.
4432 * SPP_PMTUD_DISABLE - This field will disable PMTU
4433 * discovery upon the specified address. Note that
4434 * if the address feild is empty then all addresses
4435 * on the association are effected. Not also that
4436 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4437 * exclusive. Enabling both will have undetermined
4440 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4441 * on delayed sack. The time specified in spp_sackdelay
4442 * is used to specify the sack delay for this address. Note
4443 * that if spp_address is empty then all addresses will
4444 * enable delayed sack and take on the sack delay
4445 * value specified in spp_sackdelay.
4446 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4447 * off delayed sack. If the spp_address field is blank then
4448 * delayed sack is disabled for the entire association. Note
4449 * also that this field is mutually exclusive to
4450 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4453 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
4454 char __user
*optval
, int __user
*optlen
)
4456 struct sctp_paddrparams params
;
4457 struct sctp_transport
*trans
= NULL
;
4458 struct sctp_association
*asoc
= NULL
;
4459 struct sctp_sock
*sp
= sctp_sk(sk
);
4461 if (len
< sizeof(struct sctp_paddrparams
))
4463 len
= sizeof(struct sctp_paddrparams
);
4464 if (copy_from_user(¶ms
, optval
, len
))
4467 /* If an address other than INADDR_ANY is specified, and
4468 * no transport is found, then the request is invalid.
4470 if (!sctp_is_any(sk
, (union sctp_addr
*)¶ms
.spp_address
)) {
4471 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
4472 params
.spp_assoc_id
);
4474 pr_debug("%s: failed no transport\n", __func__
);
4479 /* Get association, if assoc_id != 0 and the socket is a one
4480 * to many style socket, and an association was not found, then
4481 * the id was invalid.
4483 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
4484 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
4485 pr_debug("%s: failed no association\n", __func__
);
4490 /* Fetch transport values. */
4491 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
4492 params
.spp_pathmtu
= trans
->pathmtu
;
4493 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
4494 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
4496 /*draft-11 doesn't say what to return in spp_flags*/
4497 params
.spp_flags
= trans
->param_flags
;
4499 /* Fetch association values. */
4500 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
4501 params
.spp_pathmtu
= asoc
->pathmtu
;
4502 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
4503 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
4505 /*draft-11 doesn't say what to return in spp_flags*/
4506 params
.spp_flags
= asoc
->param_flags
;
4508 /* Fetch socket values. */
4509 params
.spp_hbinterval
= sp
->hbinterval
;
4510 params
.spp_pathmtu
= sp
->pathmtu
;
4511 params
.spp_sackdelay
= sp
->sackdelay
;
4512 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
4514 /*draft-11 doesn't say what to return in spp_flags*/
4515 params
.spp_flags
= sp
->param_flags
;
4518 if (copy_to_user(optval
, ¶ms
, len
))
4521 if (put_user(len
, optlen
))
4528 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4530 * This option will effect the way delayed acks are performed. This
4531 * option allows you to get or set the delayed ack time, in
4532 * milliseconds. It also allows changing the delayed ack frequency.
4533 * Changing the frequency to 1 disables the delayed sack algorithm. If
4534 * the assoc_id is 0, then this sets or gets the endpoints default
4535 * values. If the assoc_id field is non-zero, then the set or get
4536 * effects the specified association for the one to many model (the
4537 * assoc_id field is ignored by the one to one model). Note that if
4538 * sack_delay or sack_freq are 0 when setting this option, then the
4539 * current values will remain unchanged.
4541 * struct sctp_sack_info {
4542 * sctp_assoc_t sack_assoc_id;
4543 * uint32_t sack_delay;
4544 * uint32_t sack_freq;
4547 * sack_assoc_id - This parameter, indicates which association the user
4548 * is performing an action upon. Note that if this field's value is
4549 * zero then the endpoints default value is changed (effecting future
4550 * associations only).
4552 * sack_delay - This parameter contains the number of milliseconds that
4553 * the user is requesting the delayed ACK timer be set to. Note that
4554 * this value is defined in the standard to be between 200 and 500
4557 * sack_freq - This parameter contains the number of packets that must
4558 * be received before a sack is sent without waiting for the delay
4559 * timer to expire. The default value for this is 2, setting this
4560 * value to 1 will disable the delayed sack algorithm.
4562 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
4563 char __user
*optval
,
4566 struct sctp_sack_info params
;
4567 struct sctp_association
*asoc
= NULL
;
4568 struct sctp_sock
*sp
= sctp_sk(sk
);
4570 if (len
>= sizeof(struct sctp_sack_info
)) {
4571 len
= sizeof(struct sctp_sack_info
);
4573 if (copy_from_user(¶ms
, optval
, len
))
4575 } else if (len
== sizeof(struct sctp_assoc_value
)) {
4576 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4577 pr_warn("Use struct sctp_sack_info instead\n");
4578 if (copy_from_user(¶ms
, optval
, len
))
4583 /* Get association, if sack_assoc_id != 0 and the socket is a one
4584 * to many style socket, and an association was not found, then
4585 * the id was invalid.
4587 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
4588 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
4592 /* Fetch association values. */
4593 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4594 params
.sack_delay
= jiffies_to_msecs(
4596 params
.sack_freq
= asoc
->sackfreq
;
4599 params
.sack_delay
= 0;
4600 params
.sack_freq
= 1;
4603 /* Fetch socket values. */
4604 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4605 params
.sack_delay
= sp
->sackdelay
;
4606 params
.sack_freq
= sp
->sackfreq
;
4608 params
.sack_delay
= 0;
4609 params
.sack_freq
= 1;
4613 if (copy_to_user(optval
, ¶ms
, len
))
4616 if (put_user(len
, optlen
))
4622 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4624 * Applications can specify protocol parameters for the default association
4625 * initialization. The option name argument to setsockopt() and getsockopt()
4628 * Setting initialization parameters is effective only on an unconnected
4629 * socket (for UDP-style sockets only future associations are effected
4630 * by the change). With TCP-style sockets, this option is inherited by
4631 * sockets derived from a listener socket.
4633 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4635 if (len
< sizeof(struct sctp_initmsg
))
4637 len
= sizeof(struct sctp_initmsg
);
4638 if (put_user(len
, optlen
))
4640 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
4646 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4647 char __user
*optval
, int __user
*optlen
)
4649 struct sctp_association
*asoc
;
4651 struct sctp_getaddrs getaddrs
;
4652 struct sctp_transport
*from
;
4654 union sctp_addr temp
;
4655 struct sctp_sock
*sp
= sctp_sk(sk
);
4660 if (len
< sizeof(struct sctp_getaddrs
))
4663 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4666 /* For UDP-style sockets, id specifies the association to query. */
4667 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4671 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
4672 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
4674 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
4676 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4677 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4678 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4679 if (space_left
< addrlen
)
4681 if (copy_to_user(to
, &temp
, addrlen
))
4685 space_left
-= addrlen
;
4688 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4690 bytes_copied
= ((char __user
*)to
) - optval
;
4691 if (put_user(bytes_copied
, optlen
))
4697 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4698 size_t space_left
, int *bytes_copied
)
4700 struct sctp_sockaddr_entry
*addr
;
4701 union sctp_addr temp
;
4704 struct net
*net
= sock_net(sk
);
4707 list_for_each_entry_rcu(addr
, &net
->sctp
.local_addr_list
, list
) {
4711 if ((PF_INET
== sk
->sk_family
) &&
4712 (AF_INET6
== addr
->a
.sa
.sa_family
))
4714 if ((PF_INET6
== sk
->sk_family
) &&
4715 inet_v6_ipv6only(sk
) &&
4716 (AF_INET
== addr
->a
.sa
.sa_family
))
4718 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4719 if (!temp
.v4
.sin_port
)
4720 temp
.v4
.sin_port
= htons(port
);
4722 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4724 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4725 if (space_left
< addrlen
) {
4729 memcpy(to
, &temp
, addrlen
);
4733 space_left
-= addrlen
;
4734 *bytes_copied
+= addrlen
;
4742 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4743 char __user
*optval
, int __user
*optlen
)
4745 struct sctp_bind_addr
*bp
;
4746 struct sctp_association
*asoc
;
4748 struct sctp_getaddrs getaddrs
;
4749 struct sctp_sockaddr_entry
*addr
;
4751 union sctp_addr temp
;
4752 struct sctp_sock
*sp
= sctp_sk(sk
);
4756 int bytes_copied
= 0;
4760 if (len
< sizeof(struct sctp_getaddrs
))
4763 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4767 * For UDP-style sockets, id specifies the association to query.
4768 * If the id field is set to the value '0' then the locally bound
4769 * addresses are returned without regard to any particular
4772 if (0 == getaddrs
.assoc_id
) {
4773 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4775 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4778 bp
= &asoc
->base
.bind_addr
;
4781 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
4782 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
4784 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4788 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4789 * addresses from the global local address list.
4791 if (sctp_list_single_entry(&bp
->address_list
)) {
4792 addr
= list_entry(bp
->address_list
.next
,
4793 struct sctp_sockaddr_entry
, list
);
4794 if (sctp_is_any(sk
, &addr
->a
)) {
4795 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4796 space_left
, &bytes_copied
);
4806 /* Protection on the bound address list is not needed since
4807 * in the socket option context we hold a socket lock and
4808 * thus the bound address list can't change.
4810 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4811 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4812 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4813 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4814 if (space_left
< addrlen
) {
4815 err
= -ENOMEM
; /*fixme: right error?*/
4818 memcpy(buf
, &temp
, addrlen
);
4820 bytes_copied
+= addrlen
;
4822 space_left
-= addrlen
;
4826 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4830 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4834 if (put_user(bytes_copied
, optlen
))
4841 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4843 * Requests that the local SCTP stack use the enclosed peer address as
4844 * the association primary. The enclosed address must be one of the
4845 * association peer's addresses.
4847 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4848 char __user
*optval
, int __user
*optlen
)
4850 struct sctp_prim prim
;
4851 struct sctp_association
*asoc
;
4852 struct sctp_sock
*sp
= sctp_sk(sk
);
4854 if (len
< sizeof(struct sctp_prim
))
4857 len
= sizeof(struct sctp_prim
);
4859 if (copy_from_user(&prim
, optval
, len
))
4862 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4866 if (!asoc
->peer
.primary_path
)
4869 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4870 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4872 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4873 (union sctp_addr
*)&prim
.ssp_addr
);
4875 if (put_user(len
, optlen
))
4877 if (copy_to_user(optval
, &prim
, len
))
4884 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4886 * Requests that the local endpoint set the specified Adaptation Layer
4887 * Indication parameter for all future INIT and INIT-ACK exchanges.
4889 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4890 char __user
*optval
, int __user
*optlen
)
4892 struct sctp_setadaptation adaptation
;
4894 if (len
< sizeof(struct sctp_setadaptation
))
4897 len
= sizeof(struct sctp_setadaptation
);
4899 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4901 if (put_user(len
, optlen
))
4903 if (copy_to_user(optval
, &adaptation
, len
))
4911 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4913 * Applications that wish to use the sendto() system call may wish to
4914 * specify a default set of parameters that would normally be supplied
4915 * through the inclusion of ancillary data. This socket option allows
4916 * such an application to set the default sctp_sndrcvinfo structure.
4919 * The application that wishes to use this socket option simply passes
4920 * in to this call the sctp_sndrcvinfo structure defined in Section
4921 * 5.2.2) The input parameters accepted by this call include
4922 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4923 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4924 * to this call if the caller is using the UDP model.
4926 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4928 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4929 int len
, char __user
*optval
,
4932 struct sctp_sndrcvinfo info
;
4933 struct sctp_association
*asoc
;
4934 struct sctp_sock
*sp
= sctp_sk(sk
);
4936 if (len
< sizeof(struct sctp_sndrcvinfo
))
4939 len
= sizeof(struct sctp_sndrcvinfo
);
4941 if (copy_from_user(&info
, optval
, len
))
4944 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4945 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4949 info
.sinfo_stream
= asoc
->default_stream
;
4950 info
.sinfo_flags
= asoc
->default_flags
;
4951 info
.sinfo_ppid
= asoc
->default_ppid
;
4952 info
.sinfo_context
= asoc
->default_context
;
4953 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4955 info
.sinfo_stream
= sp
->default_stream
;
4956 info
.sinfo_flags
= sp
->default_flags
;
4957 info
.sinfo_ppid
= sp
->default_ppid
;
4958 info
.sinfo_context
= sp
->default_context
;
4959 info
.sinfo_timetolive
= sp
->default_timetolive
;
4962 if (put_user(len
, optlen
))
4964 if (copy_to_user(optval
, &info
, len
))
4972 * 7.1.5 SCTP_NODELAY
4974 * Turn on/off any Nagle-like algorithm. This means that packets are
4975 * generally sent as soon as possible and no unnecessary delays are
4976 * introduced, at the cost of more packets in the network. Expects an
4977 * integer boolean flag.
4980 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4981 char __user
*optval
, int __user
*optlen
)
4985 if (len
< sizeof(int))
4989 val
= (sctp_sk(sk
)->nodelay
== 1);
4990 if (put_user(len
, optlen
))
4992 if (copy_to_user(optval
, &val
, len
))
4999 * 7.1.1 SCTP_RTOINFO
5001 * The protocol parameters used to initialize and bound retransmission
5002 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5003 * and modify these parameters.
5004 * All parameters are time values, in milliseconds. A value of 0, when
5005 * modifying the parameters, indicates that the current value should not
5009 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
5010 char __user
*optval
,
5011 int __user
*optlen
) {
5012 struct sctp_rtoinfo rtoinfo
;
5013 struct sctp_association
*asoc
;
5015 if (len
< sizeof (struct sctp_rtoinfo
))
5018 len
= sizeof(struct sctp_rtoinfo
);
5020 if (copy_from_user(&rtoinfo
, optval
, len
))
5023 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
5025 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
5028 /* Values corresponding to the specific association. */
5030 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
5031 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
5032 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
5034 /* Values corresponding to the endpoint. */
5035 struct sctp_sock
*sp
= sctp_sk(sk
);
5037 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
5038 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
5039 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
5042 if (put_user(len
, optlen
))
5045 if (copy_to_user(optval
, &rtoinfo
, len
))
5053 * 7.1.2 SCTP_ASSOCINFO
5055 * This option is used to tune the maximum retransmission attempts
5056 * of the association.
5057 * Returns an error if the new association retransmission value is
5058 * greater than the sum of the retransmission value of the peer.
5059 * See [SCTP] for more information.
5062 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
5063 char __user
*optval
,
5067 struct sctp_assocparams assocparams
;
5068 struct sctp_association
*asoc
;
5069 struct list_head
*pos
;
5072 if (len
< sizeof (struct sctp_assocparams
))
5075 len
= sizeof(struct sctp_assocparams
);
5077 if (copy_from_user(&assocparams
, optval
, len
))
5080 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
5082 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
5085 /* Values correspoinding to the specific association */
5087 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
5088 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
5089 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
5090 assocparams
.sasoc_cookie_life
= ktime_to_ms(asoc
->cookie_life
);
5092 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
5096 assocparams
.sasoc_number_peer_destinations
= cnt
;
5098 /* Values corresponding to the endpoint */
5099 struct sctp_sock
*sp
= sctp_sk(sk
);
5101 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
5102 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
5103 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
5104 assocparams
.sasoc_cookie_life
=
5105 sp
->assocparams
.sasoc_cookie_life
;
5106 assocparams
.sasoc_number_peer_destinations
=
5108 sasoc_number_peer_destinations
;
5111 if (put_user(len
, optlen
))
5114 if (copy_to_user(optval
, &assocparams
, len
))
5121 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5123 * This socket option is a boolean flag which turns on or off mapped V4
5124 * addresses. If this option is turned on and the socket is type
5125 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5126 * If this option is turned off, then no mapping will be done of V4
5127 * addresses and a user will receive both PF_INET6 and PF_INET type
5128 * addresses on the socket.
5130 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
5131 char __user
*optval
, int __user
*optlen
)
5134 struct sctp_sock
*sp
= sctp_sk(sk
);
5136 if (len
< sizeof(int))
5141 if (put_user(len
, optlen
))
5143 if (copy_to_user(optval
, &val
, len
))
5150 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5151 * (chapter and verse is quoted at sctp_setsockopt_context())
5153 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
5154 char __user
*optval
, int __user
*optlen
)
5156 struct sctp_assoc_value params
;
5157 struct sctp_sock
*sp
;
5158 struct sctp_association
*asoc
;
5160 if (len
< sizeof(struct sctp_assoc_value
))
5163 len
= sizeof(struct sctp_assoc_value
);
5165 if (copy_from_user(¶ms
, optval
, len
))
5170 if (params
.assoc_id
!= 0) {
5171 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5174 params
.assoc_value
= asoc
->default_rcv_context
;
5176 params
.assoc_value
= sp
->default_rcv_context
;
5179 if (put_user(len
, optlen
))
5181 if (copy_to_user(optval
, ¶ms
, len
))
5188 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5189 * This option will get or set the maximum size to put in any outgoing
5190 * SCTP DATA chunk. If a message is larger than this size it will be
5191 * fragmented by SCTP into the specified size. Note that the underlying
5192 * SCTP implementation may fragment into smaller sized chunks when the
5193 * PMTU of the underlying association is smaller than the value set by
5194 * the user. The default value for this option is '0' which indicates
5195 * the user is NOT limiting fragmentation and only the PMTU will effect
5196 * SCTP's choice of DATA chunk size. Note also that values set larger
5197 * than the maximum size of an IP datagram will effectively let SCTP
5198 * control fragmentation (i.e. the same as setting this option to 0).
5200 * The following structure is used to access and modify this parameter:
5202 * struct sctp_assoc_value {
5203 * sctp_assoc_t assoc_id;
5204 * uint32_t assoc_value;
5207 * assoc_id: This parameter is ignored for one-to-one style sockets.
5208 * For one-to-many style sockets this parameter indicates which
5209 * association the user is performing an action upon. Note that if
5210 * this field's value is zero then the endpoints default value is
5211 * changed (effecting future associations only).
5212 * assoc_value: This parameter specifies the maximum size in bytes.
5214 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
5215 char __user
*optval
, int __user
*optlen
)
5217 struct sctp_assoc_value params
;
5218 struct sctp_association
*asoc
;
5220 if (len
== sizeof(int)) {
5221 pr_warn("Use of int in maxseg socket option deprecated\n");
5222 pr_warn("Use struct sctp_assoc_value instead\n");
5223 params
.assoc_id
= 0;
5224 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5225 len
= sizeof(struct sctp_assoc_value
);
5226 if (copy_from_user(¶ms
, optval
, sizeof(params
)))
5231 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5232 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
5236 params
.assoc_value
= asoc
->frag_point
;
5238 params
.assoc_value
= sctp_sk(sk
)->user_frag
;
5240 if (put_user(len
, optlen
))
5242 if (len
== sizeof(int)) {
5243 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5246 if (copy_to_user(optval
, ¶ms
, len
))
5254 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5255 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5257 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
5258 char __user
*optval
, int __user
*optlen
)
5262 if (len
< sizeof(int))
5267 val
= sctp_sk(sk
)->frag_interleave
;
5268 if (put_user(len
, optlen
))
5270 if (copy_to_user(optval
, &val
, len
))
5277 * 7.1.25. Set or Get the sctp partial delivery point
5278 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5280 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
5281 char __user
*optval
,
5286 if (len
< sizeof(u32
))
5291 val
= sctp_sk(sk
)->pd_point
;
5292 if (put_user(len
, optlen
))
5294 if (copy_to_user(optval
, &val
, len
))
5301 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5302 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5304 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5305 char __user
*optval
,
5308 struct sctp_assoc_value params
;
5309 struct sctp_sock
*sp
;
5310 struct sctp_association
*asoc
;
5312 if (len
== sizeof(int)) {
5313 pr_warn("Use of int in max_burst socket option deprecated\n");
5314 pr_warn("Use struct sctp_assoc_value instead\n");
5315 params
.assoc_id
= 0;
5316 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5317 len
= sizeof(struct sctp_assoc_value
);
5318 if (copy_from_user(¶ms
, optval
, len
))
5325 if (params
.assoc_id
!= 0) {
5326 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5329 params
.assoc_value
= asoc
->max_burst
;
5331 params
.assoc_value
= sp
->max_burst
;
5333 if (len
== sizeof(int)) {
5334 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5337 if (copy_to_user(optval
, ¶ms
, len
))
5345 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5346 char __user
*optval
, int __user
*optlen
)
5348 struct net
*net
= sock_net(sk
);
5349 struct sctp_hmacalgo __user
*p
= (void __user
*)optval
;
5350 struct sctp_hmac_algo_param
*hmacs
;
5354 if (!net
->sctp
.auth_enable
)
5357 hmacs
= sctp_sk(sk
)->ep
->auth_hmacs_list
;
5358 data_len
= ntohs(hmacs
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5360 if (len
< sizeof(struct sctp_hmacalgo
) + data_len
)
5363 len
= sizeof(struct sctp_hmacalgo
) + data_len
;
5364 num_idents
= data_len
/ sizeof(u16
);
5366 if (put_user(len
, optlen
))
5368 if (put_user(num_idents
, &p
->shmac_num_idents
))
5370 if (copy_to_user(p
->shmac_idents
, hmacs
->hmac_ids
, data_len
))
5375 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5376 char __user
*optval
, int __user
*optlen
)
5378 struct net
*net
= sock_net(sk
);
5379 struct sctp_authkeyid val
;
5380 struct sctp_association
*asoc
;
5382 if (!net
->sctp
.auth_enable
)
5385 if (len
< sizeof(struct sctp_authkeyid
))
5387 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5390 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5391 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5395 val
.scact_keynumber
= asoc
->active_key_id
;
5397 val
.scact_keynumber
= sctp_sk(sk
)->ep
->active_key_id
;
5399 len
= sizeof(struct sctp_authkeyid
);
5400 if (put_user(len
, optlen
))
5402 if (copy_to_user(optval
, &val
, len
))
5408 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5409 char __user
*optval
, int __user
*optlen
)
5411 struct net
*net
= sock_net(sk
);
5412 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5413 struct sctp_authchunks val
;
5414 struct sctp_association
*asoc
;
5415 struct sctp_chunks_param
*ch
;
5419 if (!net
->sctp
.auth_enable
)
5422 if (len
< sizeof(struct sctp_authchunks
))
5425 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
5428 to
= p
->gauth_chunks
;
5429 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5433 ch
= asoc
->peer
.peer_chunks
;
5437 /* See if the user provided enough room for all the data */
5438 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5439 if (len
< num_chunks
)
5442 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
5445 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
5446 if (put_user(len
, optlen
))
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) */