1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
18 * This SCTP implementation is free software;
19 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
24 * This SCTP implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, write to
32 * the Free Software Foundation, 59 Temple Place - Suite 330,
33 * Boston, MA 02111-1307, USA.
35 * Please send any bug reports or fixes you make to the
37 * lksctp developers <lksctp-developers@lists.sourceforge.net>
39 * Or submit a bug report through the following website:
40 * http://www.sf.net/projects/lksctp
42 * Written or modified by:
43 * La Monte H.P. Yarroll <piggy@acm.org>
44 * Narasimha Budihal <narsi@refcode.org>
45 * Karl Knutson <karl@athena.chicago.il.us>
46 * Jon Grimm <jgrimm@us.ibm.com>
47 * Xingang Guo <xingang.guo@intel.com>
48 * Daisy Chang <daisyc@us.ibm.com>
49 * Sridhar Samudrala <samudrala@us.ibm.com>
50 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
51 * Ardelle Fan <ardelle.fan@intel.com>
52 * Ryan Layer <rmlayer@us.ibm.com>
53 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
54 * Kevin Gao <kevin.gao@intel.com>
56 * Any bugs reported given to us we will try to fix... any fixes shared will
57 * be incorporated into the next SCTP release.
60 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
62 #include <linux/types.h>
63 #include <linux/kernel.h>
64 #include <linux/wait.h>
65 #include <linux/time.h>
67 #include <linux/capability.h>
68 #include <linux/fcntl.h>
69 #include <linux/poll.h>
70 #include <linux/init.h>
71 #include <linux/crypto.h>
72 #include <linux/slab.h>
76 #include <net/route.h>
78 #include <net/inet_common.h>
80 #include <linux/socket.h> /* for sa_family_t */
81 #include <linux/export.h>
83 #include <net/sctp/sctp.h>
84 #include <net/sctp/sm.h>
86 /* WARNING: Please do not remove the SCTP_STATIC attribute to
87 * any of the functions below as they are used to export functions
88 * used by a project regression testsuite.
91 /* Forward declarations for internal helper functions. */
92 static int sctp_writeable(struct sock
*sk
);
93 static void sctp_wfree(struct sk_buff
*skb
);
94 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
96 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
);
97 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
98 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
99 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
100 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
101 union sctp_addr
*addr
, int len
);
102 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
103 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
104 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
105 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
106 static int sctp_send_asconf(struct sctp_association
*asoc
,
107 struct sctp_chunk
*chunk
);
108 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
109 static int sctp_autobind(struct sock
*sk
);
110 static void sctp_sock_migrate(struct sock
*, struct sock
*,
111 struct sctp_association
*, sctp_socket_type_t
);
112 static char *sctp_hmac_alg
= SCTP_COOKIE_HMAC_ALG
;
114 extern struct kmem_cache
*sctp_bucket_cachep
;
115 extern long sysctl_sctp_mem
[3];
116 extern int sysctl_sctp_rmem
[3];
117 extern int sysctl_sctp_wmem
[3];
119 static int sctp_memory_pressure
;
120 static atomic_long_t sctp_memory_allocated
;
121 struct percpu_counter sctp_sockets_allocated
;
123 static void sctp_enter_memory_pressure(struct sock
*sk
)
125 sctp_memory_pressure
= 1;
129 /* Get the sndbuf space available at the time on the association. */
130 static inline int sctp_wspace(struct sctp_association
*asoc
)
134 if (asoc
->ep
->sndbuf_policy
)
135 amt
= asoc
->sndbuf_used
;
137 amt
= sk_wmem_alloc_get(asoc
->base
.sk
);
139 if (amt
>= asoc
->base
.sk
->sk_sndbuf
) {
140 if (asoc
->base
.sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)
143 amt
= sk_stream_wspace(asoc
->base
.sk
);
148 amt
= asoc
->base
.sk
->sk_sndbuf
- amt
;
153 /* Increment the used sndbuf space count of the corresponding association by
154 * the size of the outgoing data chunk.
155 * Also, set the skb destructor for sndbuf accounting later.
157 * Since it is always 1-1 between chunk and skb, and also a new skb is always
158 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
159 * destructor in the data chunk skb for the purpose of the sndbuf space
162 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
164 struct sctp_association
*asoc
= chunk
->asoc
;
165 struct sock
*sk
= asoc
->base
.sk
;
167 /* The sndbuf space is tracked per association. */
168 sctp_association_hold(asoc
);
170 skb_set_owner_w(chunk
->skb
, sk
);
172 chunk
->skb
->destructor
= sctp_wfree
;
173 /* Save the chunk pointer in skb for sctp_wfree to use later. */
174 *((struct sctp_chunk
**)(chunk
->skb
->cb
)) = chunk
;
176 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
177 sizeof(struct sk_buff
) +
178 sizeof(struct sctp_chunk
);
180 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
181 sk
->sk_wmem_queued
+= chunk
->skb
->truesize
;
182 sk_mem_charge(sk
, chunk
->skb
->truesize
);
185 /* Verify that this is a valid address. */
186 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
191 /* Verify basic sockaddr. */
192 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
196 /* Is this a valid SCTP address? */
197 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
200 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
206 /* Look up the association by its id. If this is not a UDP-style
207 * socket, the ID field is always ignored.
209 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
211 struct sctp_association
*asoc
= NULL
;
213 /* If this is not a UDP-style socket, assoc id should be ignored. */
214 if (!sctp_style(sk
, UDP
)) {
215 /* Return NULL if the socket state is not ESTABLISHED. It
216 * could be a TCP-style listening socket or a socket which
217 * hasn't yet called connect() to establish an association.
219 if (!sctp_sstate(sk
, ESTABLISHED
))
222 /* Get the first and the only association from the list. */
223 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
224 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
225 struct sctp_association
, asocs
);
229 /* Otherwise this is a UDP-style socket. */
230 if (!id
|| (id
== (sctp_assoc_t
)-1))
233 spin_lock_bh(&sctp_assocs_id_lock
);
234 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
235 spin_unlock_bh(&sctp_assocs_id_lock
);
237 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
243 /* Look up the transport from an address and an assoc id. If both address and
244 * id are specified, the associations matching the address and the id should be
247 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
248 struct sockaddr_storage
*addr
,
251 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
252 struct sctp_transport
*transport
;
253 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
255 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
262 id_asoc
= sctp_id2assoc(sk
, id
);
263 if (id_asoc
&& (id_asoc
!= addr_asoc
))
266 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
267 (union sctp_addr
*)addr
);
272 /* API 3.1.2 bind() - UDP Style Syntax
273 * The syntax of bind() is,
275 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
277 * sd - the socket descriptor returned by socket().
278 * addr - the address structure (struct sockaddr_in or struct
279 * sockaddr_in6 [RFC 2553]),
280 * addr_len - the size of the address structure.
282 SCTP_STATIC
int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
288 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
291 /* Disallow binding twice. */
292 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
293 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
298 sctp_release_sock(sk
);
303 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
305 /* Verify this is a valid sockaddr. */
306 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
307 union sctp_addr
*addr
, int len
)
311 /* Check minimum size. */
312 if (len
< sizeof (struct sockaddr
))
315 /* V4 mapped address are really of AF_INET family */
316 if (addr
->sa
.sa_family
== AF_INET6
&&
317 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
)) {
318 if (!opt
->pf
->af_supported(AF_INET
, opt
))
321 /* Does this PF support this AF? */
322 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
326 /* If we get this far, af is valid. */
327 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
329 if (len
< af
->sockaddr_len
)
335 /* Bind a local address either to an endpoint or to an association. */
336 SCTP_STATIC
int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
338 struct sctp_sock
*sp
= sctp_sk(sk
);
339 struct sctp_endpoint
*ep
= sp
->ep
;
340 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
345 /* Common sockaddr verification. */
346 af
= sctp_sockaddr_af(sp
, addr
, len
);
348 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
353 snum
= ntohs(addr
->v4
.sin_port
);
355 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
356 ", port: %d, new port: %d, len: %d)\n",
362 /* PF specific bind() address verification. */
363 if (!sp
->pf
->bind_verify(sp
, addr
))
364 return -EADDRNOTAVAIL
;
366 /* We must either be unbound, or bind to the same port.
367 * It's OK to allow 0 ports if we are already bound.
368 * We'll just inhert an already bound port in this case
373 else if (snum
!= bp
->port
) {
374 SCTP_DEBUG_PRINTK("sctp_do_bind:"
375 " New port %d does not match existing port "
376 "%d.\n", snum
, bp
->port
);
381 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
384 /* See if the address matches any of the addresses we may have
385 * already bound before checking against other endpoints.
387 if (sctp_bind_addr_match(bp
, addr
, sp
))
390 /* Make sure we are allowed to bind here.
391 * The function sctp_get_port_local() does duplicate address
394 addr
->v4
.sin_port
= htons(snum
);
395 if ((ret
= sctp_get_port_local(sk
, addr
))) {
399 /* Refresh ephemeral port. */
401 bp
->port
= inet_sk(sk
)->inet_num
;
403 /* Add the address to the bind address list.
404 * Use GFP_ATOMIC since BHs will be disabled.
406 ret
= sctp_add_bind_addr(bp
, addr
, SCTP_ADDR_SRC
, GFP_ATOMIC
);
408 /* Copy back into socket for getsockname() use. */
410 inet_sk(sk
)->inet_sport
= htons(inet_sk(sk
)->inet_num
);
411 af
->to_sk_saddr(addr
, sk
);
417 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
419 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
420 * at any one time. If a sender, after sending an ASCONF chunk, decides
421 * it needs to transfer another ASCONF Chunk, it MUST wait until the
422 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
423 * subsequent ASCONF. Note this restriction binds each side, so at any
424 * time two ASCONF may be in-transit on any given association (one sent
425 * from each endpoint).
427 static int sctp_send_asconf(struct sctp_association
*asoc
,
428 struct sctp_chunk
*chunk
)
430 struct net
*net
= sock_net(asoc
->base
.sk
);
433 /* If there is an outstanding ASCONF chunk, queue it for later
436 if (asoc
->addip_last_asconf
) {
437 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
441 /* Hold the chunk until an ASCONF_ACK is received. */
442 sctp_chunk_hold(chunk
);
443 retval
= sctp_primitive_ASCONF(net
, asoc
, chunk
);
445 sctp_chunk_free(chunk
);
447 asoc
->addip_last_asconf
= chunk
;
453 /* Add a list of addresses as bind addresses to local endpoint or
456 * Basically run through each address specified in the addrs/addrcnt
457 * array/length pair, determine if it is IPv6 or IPv4 and call
458 * sctp_do_bind() on it.
460 * If any of them fails, then the operation will be reversed and the
461 * ones that were added will be removed.
463 * Only sctp_setsockopt_bindx() is supposed to call this function.
465 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
470 struct sockaddr
*sa_addr
;
473 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
477 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
478 /* The list may contain either IPv4 or IPv6 address;
479 * determine the address length for walking thru the list.
482 af
= sctp_get_af_specific(sa_addr
->sa_family
);
488 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
491 addr_buf
+= af
->sockaddr_len
;
495 /* Failed. Cleanup the ones that have been added */
497 sctp_bindx_rem(sk
, addrs
, cnt
);
505 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
506 * associations that are part of the endpoint indicating that a list of local
507 * addresses are added to the endpoint.
509 * If any of the addresses is already in the bind address list of the
510 * association, we do not send the chunk for that association. But it will not
511 * affect other associations.
513 * Only sctp_setsockopt_bindx() is supposed to call this function.
515 static int sctp_send_asconf_add_ip(struct sock
*sk
,
516 struct sockaddr
*addrs
,
519 struct net
*net
= sock_net(sk
);
520 struct sctp_sock
*sp
;
521 struct sctp_endpoint
*ep
;
522 struct sctp_association
*asoc
;
523 struct sctp_bind_addr
*bp
;
524 struct sctp_chunk
*chunk
;
525 struct sctp_sockaddr_entry
*laddr
;
526 union sctp_addr
*addr
;
527 union sctp_addr saveaddr
;
534 if (!net
->sctp
.addip_enable
)
540 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
541 __func__
, sk
, addrs
, addrcnt
);
543 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
545 if (!asoc
->peer
.asconf_capable
)
548 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
551 if (!sctp_state(asoc
, ESTABLISHED
))
554 /* Check if any address in the packed array of addresses is
555 * in the bind address list of the association. If so,
556 * do not send the asconf chunk to its peer, but continue with
557 * other associations.
560 for (i
= 0; i
< addrcnt
; i
++) {
562 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
568 if (sctp_assoc_lookup_laddr(asoc
, addr
))
571 addr_buf
+= af
->sockaddr_len
;
576 /* Use the first valid address in bind addr list of
577 * association as Address Parameter of ASCONF CHUNK.
579 bp
= &asoc
->base
.bind_addr
;
580 p
= bp
->address_list
.next
;
581 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
582 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
583 addrcnt
, SCTP_PARAM_ADD_IP
);
589 /* Add the new addresses to the bind address list with
590 * use_as_src set to 0.
593 for (i
= 0; i
< addrcnt
; i
++) {
595 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
596 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
597 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
598 SCTP_ADDR_NEW
, GFP_ATOMIC
);
599 addr_buf
+= af
->sockaddr_len
;
601 if (asoc
->src_out_of_asoc_ok
) {
602 struct sctp_transport
*trans
;
604 list_for_each_entry(trans
,
605 &asoc
->peer
.transport_addr_list
, transports
) {
606 /* Clear the source and route cache */
607 dst_release(trans
->dst
);
608 trans
->cwnd
= min(4*asoc
->pathmtu
, max_t(__u32
,
609 2*asoc
->pathmtu
, 4380));
610 trans
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
611 trans
->rto
= asoc
->rto_initial
;
612 trans
->rtt
= trans
->srtt
= trans
->rttvar
= 0;
613 sctp_transport_route(trans
, NULL
,
614 sctp_sk(asoc
->base
.sk
));
617 retval
= sctp_send_asconf(asoc
, chunk
);
624 /* Remove a list of addresses from bind addresses list. Do not remove the
627 * Basically run through each address specified in the addrs/addrcnt
628 * array/length pair, determine if it is IPv6 or IPv4 and call
629 * sctp_del_bind() on it.
631 * If any of them fails, then the operation will be reversed and the
632 * ones that were removed will be added back.
634 * At least one address has to be left; if only one address is
635 * available, the operation will return -EBUSY.
637 * Only sctp_setsockopt_bindx() is supposed to call this function.
639 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
641 struct sctp_sock
*sp
= sctp_sk(sk
);
642 struct sctp_endpoint
*ep
= sp
->ep
;
644 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
647 union sctp_addr
*sa_addr
;
650 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
654 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
655 /* If the bind address list is empty or if there is only one
656 * bind address, there is nothing more to be removed (we need
657 * at least one address here).
659 if (list_empty(&bp
->address_list
) ||
660 (sctp_list_single_entry(&bp
->address_list
))) {
666 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
672 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
673 retval
= -EADDRNOTAVAIL
;
677 if (sa_addr
->v4
.sin_port
&&
678 sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
683 if (!sa_addr
->v4
.sin_port
)
684 sa_addr
->v4
.sin_port
= htons(bp
->port
);
686 /* FIXME - There is probably a need to check if sk->sk_saddr and
687 * sk->sk_rcv_addr are currently set to one of the addresses to
688 * be removed. This is something which needs to be looked into
689 * when we are fixing the outstanding issues with multi-homing
690 * socket routing and failover schemes. Refer to comments in
691 * sctp_do_bind(). -daisy
693 retval
= sctp_del_bind_addr(bp
, sa_addr
);
695 addr_buf
+= af
->sockaddr_len
;
698 /* Failed. Add the ones that has been removed back */
700 sctp_bindx_add(sk
, addrs
, cnt
);
708 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
709 * the associations that are part of the endpoint indicating that a list of
710 * local addresses are removed from the endpoint.
712 * If any of the addresses is already in the bind address list of the
713 * association, we do not send the chunk for that association. But it will not
714 * affect other associations.
716 * Only sctp_setsockopt_bindx() is supposed to call this function.
718 static int sctp_send_asconf_del_ip(struct sock
*sk
,
719 struct sockaddr
*addrs
,
722 struct net
*net
= sock_net(sk
);
723 struct sctp_sock
*sp
;
724 struct sctp_endpoint
*ep
;
725 struct sctp_association
*asoc
;
726 struct sctp_transport
*transport
;
727 struct sctp_bind_addr
*bp
;
728 struct sctp_chunk
*chunk
;
729 union sctp_addr
*laddr
;
732 struct sctp_sockaddr_entry
*saddr
;
738 if (!net
->sctp
.addip_enable
)
744 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
745 __func__
, sk
, addrs
, addrcnt
);
747 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
749 if (!asoc
->peer
.asconf_capable
)
752 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
755 if (!sctp_state(asoc
, ESTABLISHED
))
758 /* Check if any address in the packed array of addresses is
759 * not present in the bind address list of the association.
760 * If so, do not send the asconf chunk to its peer, but
761 * continue with other associations.
764 for (i
= 0; i
< addrcnt
; i
++) {
766 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
772 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
775 addr_buf
+= af
->sockaddr_len
;
780 /* Find one address in the association's bind address list
781 * that is not in the packed array of addresses. This is to
782 * make sure that we do not delete all the addresses in the
785 bp
= &asoc
->base
.bind_addr
;
786 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
788 if ((laddr
== NULL
) && (addrcnt
== 1)) {
789 if (asoc
->asconf_addr_del_pending
)
791 asoc
->asconf_addr_del_pending
=
792 kzalloc(sizeof(union sctp_addr
), GFP_ATOMIC
);
793 if (asoc
->asconf_addr_del_pending
== NULL
) {
797 asoc
->asconf_addr_del_pending
->sa
.sa_family
=
799 asoc
->asconf_addr_del_pending
->v4
.sin_port
=
801 if (addrs
->sa_family
== AF_INET
) {
802 struct sockaddr_in
*sin
;
804 sin
= (struct sockaddr_in
*)addrs
;
805 asoc
->asconf_addr_del_pending
->v4
.sin_addr
.s_addr
= sin
->sin_addr
.s_addr
;
806 } else if (addrs
->sa_family
== AF_INET6
) {
807 struct sockaddr_in6
*sin6
;
809 sin6
= (struct sockaddr_in6
*)addrs
;
810 asoc
->asconf_addr_del_pending
->v6
.sin6_addr
= sin6
->sin6_addr
;
812 SCTP_DEBUG_PRINTK_IPADDR("send_asconf_del_ip: keep the last address asoc: %p ",
813 " at %p\n", asoc
, asoc
->asconf_addr_del_pending
,
814 asoc
->asconf_addr_del_pending
);
815 asoc
->src_out_of_asoc_ok
= 1;
820 /* We do not need RCU protection throughout this loop
821 * because this is done under a socket lock from the
824 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
832 /* Reset use_as_src flag for the addresses in the bind address
833 * list that are to be deleted.
836 for (i
= 0; i
< addrcnt
; i
++) {
838 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
839 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
840 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
841 saddr
->state
= SCTP_ADDR_DEL
;
843 addr_buf
+= af
->sockaddr_len
;
846 /* Update the route and saddr entries for all the transports
847 * as some of the addresses in the bind address list are
848 * about to be deleted and cannot be used as source addresses.
850 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
852 dst_release(transport
->dst
);
853 sctp_transport_route(transport
, NULL
,
854 sctp_sk(asoc
->base
.sk
));
858 /* We don't need to transmit ASCONF */
860 retval
= sctp_send_asconf(asoc
, chunk
);
866 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
867 int sctp_asconf_mgmt(struct sctp_sock
*sp
, struct sctp_sockaddr_entry
*addrw
)
869 struct sock
*sk
= sctp_opt2sk(sp
);
870 union sctp_addr
*addr
;
873 /* It is safe to write port space in caller. */
875 addr
->v4
.sin_port
= htons(sp
->ep
->base
.bind_addr
.port
);
876 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
879 if (sctp_verify_addr(sk
, addr
, af
->sockaddr_len
))
882 if (addrw
->state
== SCTP_ADDR_NEW
)
883 return sctp_send_asconf_add_ip(sk
, (struct sockaddr
*)addr
, 1);
885 return sctp_send_asconf_del_ip(sk
, (struct sockaddr
*)addr
, 1);
888 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
891 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
894 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
895 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
898 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
899 * Section 3.1.2 for this usage.
901 * addrs is a pointer to an array of one or more socket addresses. Each
902 * address is contained in its appropriate structure (i.e. struct
903 * sockaddr_in or struct sockaddr_in6) the family of the address type
904 * must be used to distinguish the address length (note that this
905 * representation is termed a "packed array" of addresses). The caller
906 * specifies the number of addresses in the array with addrcnt.
908 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
909 * -1, and sets errno to the appropriate error code.
911 * For SCTP, the port given in each socket address must be the same, or
912 * sctp_bindx() will fail, setting errno to EINVAL.
914 * The flags parameter is formed from the bitwise OR of zero or more of
915 * the following currently defined flags:
917 * SCTP_BINDX_ADD_ADDR
919 * SCTP_BINDX_REM_ADDR
921 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
922 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
923 * addresses from the association. The two flags are mutually exclusive;
924 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
925 * not remove all addresses from an association; sctp_bindx() will
926 * reject such an attempt with EINVAL.
928 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
929 * additional addresses with an endpoint after calling bind(). Or use
930 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
931 * socket is associated with so that no new association accepted will be
932 * associated with those addresses. If the endpoint supports dynamic
933 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
934 * endpoint to send the appropriate message to the peer to change the
935 * peers address lists.
937 * Adding and removing addresses from a connected association is
938 * optional functionality. Implementations that do not support this
939 * functionality should return EOPNOTSUPP.
941 * Basically do nothing but copying the addresses from user to kernel
942 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
943 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
946 * We don't use copy_from_user() for optimization: we first do the
947 * sanity checks (buffer size -fast- and access check-healthy
948 * pointer); if all of those succeed, then we can alloc the memory
949 * (expensive operation) needed to copy the data to kernel. Then we do
950 * the copying without checking the user space area
951 * (__copy_from_user()).
953 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
956 * sk The sk of the socket
957 * addrs The pointer to the addresses in user land
958 * addrssize Size of the addrs buffer
959 * op Operation to perform (add or remove, see the flags of
962 * Returns 0 if ok, <0 errno code on error.
964 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
965 struct sockaddr __user
*addrs
,
966 int addrs_size
, int op
)
968 struct sockaddr
*kaddrs
;
972 struct sockaddr
*sa_addr
;
976 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
977 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
979 if (unlikely(addrs_size
<= 0))
982 /* Check the user passed a healthy pointer. */
983 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
986 /* Alloc space for the address array in kernel memory. */
987 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
988 if (unlikely(!kaddrs
))
991 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
996 /* Walk through the addrs buffer and count the number of addresses. */
998 while (walk_size
< addrs_size
) {
999 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1005 af
= sctp_get_af_specific(sa_addr
->sa_family
);
1007 /* If the address family is not supported or if this address
1008 * causes the address buffer to overflow return EINVAL.
1010 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1015 addr_buf
+= af
->sockaddr_len
;
1016 walk_size
+= af
->sockaddr_len
;
1021 case SCTP_BINDX_ADD_ADDR
:
1022 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
1025 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
1028 case SCTP_BINDX_REM_ADDR
:
1029 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
1032 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
1046 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1048 * Common routine for handling connect() and sctp_connectx().
1049 * Connect will come in with just a single address.
1051 static int __sctp_connect(struct sock
* sk
,
1052 struct sockaddr
*kaddrs
,
1054 sctp_assoc_t
*assoc_id
)
1056 struct net
*net
= sock_net(sk
);
1057 struct sctp_sock
*sp
;
1058 struct sctp_endpoint
*ep
;
1059 struct sctp_association
*asoc
= NULL
;
1060 struct sctp_association
*asoc2
;
1061 struct sctp_transport
*transport
;
1069 union sctp_addr
*sa_addr
= NULL
;
1071 unsigned short port
;
1072 unsigned int f_flags
= 0;
1077 /* connect() cannot be done on a socket that is already in ESTABLISHED
1078 * state - UDP-style peeled off socket or a TCP-style socket that
1079 * is already connected.
1080 * It cannot be done even on a TCP-style listening socket.
1082 if (sctp_sstate(sk
, ESTABLISHED
) ||
1083 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
1088 /* Walk through the addrs buffer and count the number of addresses. */
1090 while (walk_size
< addrs_size
) {
1091 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1097 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1099 /* If the address family is not supported or if this address
1100 * causes the address buffer to overflow return EINVAL.
1102 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1107 port
= ntohs(sa_addr
->v4
.sin_port
);
1109 /* Save current address so we can work with it */
1110 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1112 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1116 /* Make sure the destination port is correctly set
1119 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
)
1123 /* Check if there already is a matching association on the
1124 * endpoint (other than the one created here).
1126 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1127 if (asoc2
&& asoc2
!= asoc
) {
1128 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1135 /* If we could not find a matching association on the endpoint,
1136 * make sure that there is no peeled-off association matching
1137 * the peer address even on another socket.
1139 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1140 err
= -EADDRNOTAVAIL
;
1145 /* If a bind() or sctp_bindx() is not called prior to
1146 * an sctp_connectx() call, the system picks an
1147 * ephemeral port and will choose an address set
1148 * equivalent to binding with a wildcard address.
1150 if (!ep
->base
.bind_addr
.port
) {
1151 if (sctp_autobind(sk
)) {
1157 * If an unprivileged user inherits a 1-many
1158 * style socket with open associations on a
1159 * privileged port, it MAY be permitted to
1160 * accept new associations, but it SHOULD NOT
1161 * be permitted to open new associations.
1163 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1164 !capable(CAP_NET_BIND_SERVICE
)) {
1170 scope
= sctp_scope(&to
);
1171 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1177 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
,
1185 /* Prime the peer's transport structures. */
1186 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1194 addr_buf
+= af
->sockaddr_len
;
1195 walk_size
+= af
->sockaddr_len
;
1198 /* In case the user of sctp_connectx() wants an association
1199 * id back, assign one now.
1202 err
= sctp_assoc_set_id(asoc
, GFP_KERNEL
);
1207 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1212 /* Initialize sk's dport and daddr for getpeername() */
1213 inet_sk(sk
)->inet_dport
= htons(asoc
->peer
.port
);
1214 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1215 af
->to_sk_daddr(sa_addr
, sk
);
1218 /* in-kernel sockets don't generally have a file allocated to them
1219 * if all they do is call sock_create_kern().
1221 if (sk
->sk_socket
->file
)
1222 f_flags
= sk
->sk_socket
->file
->f_flags
;
1224 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1226 err
= sctp_wait_for_connect(asoc
, &timeo
);
1227 if ((err
== 0 || err
== -EINPROGRESS
) && assoc_id
)
1228 *assoc_id
= asoc
->assoc_id
;
1230 /* Don't free association on exit. */
1235 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1236 " kaddrs: %p err: %d\n",
1239 /* sctp_primitive_ASSOCIATE may have added this association
1240 * To the hash table, try to unhash it, just in case, its a noop
1241 * if it wasn't hashed so we're safe
1243 sctp_unhash_established(asoc
);
1244 sctp_association_free(asoc
);
1249 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1252 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1253 * sctp_assoc_t *asoc);
1255 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1256 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1257 * or IPv6 addresses.
1259 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1260 * Section 3.1.2 for this usage.
1262 * addrs is a pointer to an array of one or more socket addresses. Each
1263 * address is contained in its appropriate structure (i.e. struct
1264 * sockaddr_in or struct sockaddr_in6) the family of the address type
1265 * must be used to distengish the address length (note that this
1266 * representation is termed a "packed array" of addresses). The caller
1267 * specifies the number of addresses in the array with addrcnt.
1269 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1270 * the association id of the new association. On failure, sctp_connectx()
1271 * returns -1, and sets errno to the appropriate error code. The assoc_id
1272 * is not touched by the kernel.
1274 * For SCTP, the port given in each socket address must be the same, or
1275 * sctp_connectx() will fail, setting errno to EINVAL.
1277 * An application can use sctp_connectx to initiate an association with
1278 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1279 * allows a caller to specify multiple addresses at which a peer can be
1280 * reached. The way the SCTP stack uses the list of addresses to set up
1281 * the association is implementation dependent. This function only
1282 * specifies that the stack will try to make use of all the addresses in
1283 * the list when needed.
1285 * Note that the list of addresses passed in is only used for setting up
1286 * the association. It does not necessarily equal the set of addresses
1287 * the peer uses for the resulting association. If the caller wants to
1288 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1289 * retrieve them after the association has been set up.
1291 * Basically do nothing but copying the addresses from user to kernel
1292 * land and invoking either sctp_connectx(). This is used for tunneling
1293 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1295 * We don't use copy_from_user() for optimization: we first do the
1296 * sanity checks (buffer size -fast- and access check-healthy
1297 * pointer); if all of those succeed, then we can alloc the memory
1298 * (expensive operation) needed to copy the data to kernel. Then we do
1299 * the copying without checking the user space area
1300 * (__copy_from_user()).
1302 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1305 * sk The sk of the socket
1306 * addrs The pointer to the addresses in user land
1307 * addrssize Size of the addrs buffer
1309 * Returns >=0 if ok, <0 errno code on error.
1311 SCTP_STATIC
int __sctp_setsockopt_connectx(struct sock
* sk
,
1312 struct sockaddr __user
*addrs
,
1314 sctp_assoc_t
*assoc_id
)
1317 struct sockaddr
*kaddrs
;
1319 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1320 __func__
, sk
, addrs
, addrs_size
);
1322 if (unlikely(addrs_size
<= 0))
1325 /* Check the user passed a healthy pointer. */
1326 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1329 /* Alloc space for the address array in kernel memory. */
1330 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1331 if (unlikely(!kaddrs
))
1334 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1337 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, assoc_id
);
1346 * This is an older interface. It's kept for backward compatibility
1347 * to the option that doesn't provide association id.
1349 SCTP_STATIC
int sctp_setsockopt_connectx_old(struct sock
* sk
,
1350 struct sockaddr __user
*addrs
,
1353 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1357 * New interface for the API. The since the API is done with a socket
1358 * option, to make it simple we feed back the association id is as a return
1359 * indication to the call. Error is always negative and association id is
1362 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1363 struct sockaddr __user
*addrs
,
1366 sctp_assoc_t assoc_id
= 0;
1369 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1378 * New (hopefully final) interface for the API.
1379 * We use the sctp_getaddrs_old structure so that use-space library
1380 * can avoid any unnecessary allocations. The only defferent part
1381 * is that we store the actual length of the address buffer into the
1382 * addrs_num structure member. That way we can re-use the existing
1385 SCTP_STATIC
int sctp_getsockopt_connectx3(struct sock
* sk
, int len
,
1386 char __user
*optval
,
1389 struct sctp_getaddrs_old param
;
1390 sctp_assoc_t assoc_id
= 0;
1393 if (len
< sizeof(param
))
1396 if (copy_from_user(¶m
, optval
, sizeof(param
)))
1399 err
= __sctp_setsockopt_connectx(sk
,
1400 (struct sockaddr __user
*)param
.addrs
,
1401 param
.addr_num
, &assoc_id
);
1403 if (err
== 0 || err
== -EINPROGRESS
) {
1404 if (copy_to_user(optval
, &assoc_id
, sizeof(assoc_id
)))
1406 if (put_user(sizeof(assoc_id
), optlen
))
1413 /* API 3.1.4 close() - UDP Style Syntax
1414 * Applications use close() to perform graceful shutdown (as described in
1415 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1416 * by a UDP-style socket.
1420 * ret = close(int sd);
1422 * sd - the socket descriptor of the associations to be closed.
1424 * To gracefully shutdown a specific association represented by the
1425 * UDP-style socket, an application should use the sendmsg() call,
1426 * passing no user data, but including the appropriate flag in the
1427 * ancillary data (see Section xxxx).
1429 * If sd in the close() call is a branched-off socket representing only
1430 * one association, the shutdown is performed on that association only.
1432 * 4.1.6 close() - TCP Style Syntax
1434 * Applications use close() to gracefully close down an association.
1438 * int close(int sd);
1440 * sd - the socket descriptor of the association to be closed.
1442 * After an application calls close() on a socket descriptor, no further
1443 * socket operations will succeed on that descriptor.
1445 * API 7.1.4 SO_LINGER
1447 * An application using the TCP-style socket can use this option to
1448 * perform the SCTP ABORT primitive. The linger option structure is:
1451 * int l_onoff; // option on/off
1452 * int l_linger; // linger time
1455 * To enable the option, set l_onoff to 1. If the l_linger value is set
1456 * to 0, calling close() is the same as the ABORT primitive. If the
1457 * value is set to a negative value, the setsockopt() call will return
1458 * an error. If the value is set to a positive value linger_time, the
1459 * close() can be blocked for at most linger_time ms. If the graceful
1460 * shutdown phase does not finish during this period, close() will
1461 * return but the graceful shutdown phase continues in the system.
1463 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1465 struct net
*net
= sock_net(sk
);
1466 struct sctp_endpoint
*ep
;
1467 struct sctp_association
*asoc
;
1468 struct list_head
*pos
, *temp
;
1469 unsigned int data_was_unread
;
1471 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1474 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1475 sk
->sk_state
= SCTP_SS_CLOSING
;
1477 ep
= sctp_sk(sk
)->ep
;
1479 /* Clean up any skbs sitting on the receive queue. */
1480 data_was_unread
= sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1481 data_was_unread
+= sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1483 /* Walk all associations on an endpoint. */
1484 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1485 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1487 if (sctp_style(sk
, TCP
)) {
1488 /* A closed association can still be in the list if
1489 * it belongs to a TCP-style listening socket that is
1490 * not yet accepted. If so, free it. If not, send an
1491 * ABORT or SHUTDOWN based on the linger options.
1493 if (sctp_state(asoc
, CLOSED
)) {
1494 sctp_unhash_established(asoc
);
1495 sctp_association_free(asoc
);
1500 if (data_was_unread
|| !skb_queue_empty(&asoc
->ulpq
.lobby
) ||
1501 !skb_queue_empty(&asoc
->ulpq
.reasm
) ||
1502 (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
)) {
1503 struct sctp_chunk
*chunk
;
1505 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1507 sctp_primitive_ABORT(net
, asoc
, chunk
);
1509 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1512 /* On a TCP-style socket, block for at most linger_time if set. */
1513 if (sctp_style(sk
, TCP
) && timeout
)
1514 sctp_wait_for_close(sk
, timeout
);
1516 /* This will run the backlog queue. */
1517 sctp_release_sock(sk
);
1519 /* Supposedly, no process has access to the socket, but
1520 * the net layers still may.
1522 sctp_local_bh_disable();
1523 sctp_bh_lock_sock(sk
);
1525 /* Hold the sock, since sk_common_release() will put sock_put()
1526 * and we have just a little more cleanup.
1529 sk_common_release(sk
);
1531 sctp_bh_unlock_sock(sk
);
1532 sctp_local_bh_enable();
1536 SCTP_DBG_OBJCNT_DEC(sock
);
1539 /* Handle EPIPE error. */
1540 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1543 err
= sock_error(sk
) ? : -EPIPE
;
1544 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1545 send_sig(SIGPIPE
, current
, 0);
1549 /* API 3.1.3 sendmsg() - UDP Style Syntax
1551 * An application uses sendmsg() and recvmsg() calls to transmit data to
1552 * and receive data from its peer.
1554 * ssize_t sendmsg(int socket, const struct msghdr *message,
1557 * socket - the socket descriptor of the endpoint.
1558 * message - pointer to the msghdr structure which contains a single
1559 * user message and possibly some ancillary data.
1561 * See Section 5 for complete description of the data
1564 * flags - flags sent or received with the user message, see Section
1565 * 5 for complete description of the flags.
1567 * Note: This function could use a rewrite especially when explicit
1568 * connect support comes in.
1570 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1572 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1574 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1575 struct msghdr
*msg
, size_t msg_len
)
1577 struct net
*net
= sock_net(sk
);
1578 struct sctp_sock
*sp
;
1579 struct sctp_endpoint
*ep
;
1580 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1581 struct sctp_transport
*transport
, *chunk_tp
;
1582 struct sctp_chunk
*chunk
;
1584 struct sockaddr
*msg_name
= NULL
;
1585 struct sctp_sndrcvinfo default_sinfo
;
1586 struct sctp_sndrcvinfo
*sinfo
;
1587 struct sctp_initmsg
*sinit
;
1588 sctp_assoc_t associd
= 0;
1589 sctp_cmsgs_t cmsgs
= { NULL
};
1593 __u16 sinfo_flags
= 0;
1594 struct sctp_datamsg
*datamsg
;
1595 int msg_flags
= msg
->msg_flags
;
1597 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1604 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1606 /* We cannot send a message over a TCP-style listening socket. */
1607 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1612 /* Parse out the SCTP CMSGs. */
1613 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1616 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1620 /* Fetch the destination address for this packet. This
1621 * address only selects the association--it is not necessarily
1622 * the address we will send to.
1623 * For a peeled-off socket, msg_name is ignored.
1625 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1626 int msg_namelen
= msg
->msg_namelen
;
1628 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1633 if (msg_namelen
> sizeof(to
))
1634 msg_namelen
= sizeof(to
);
1635 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1636 msg_name
= msg
->msg_name
;
1642 /* Did the user specify SNDRCVINFO? */
1644 sinfo_flags
= sinfo
->sinfo_flags
;
1645 associd
= sinfo
->sinfo_assoc_id
;
1648 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1649 msg_len
, sinfo_flags
);
1651 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1652 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1657 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1658 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1659 * If SCTP_ABORT is set, the message length could be non zero with
1660 * the msg_iov set to the user abort reason.
1662 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1663 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1668 /* If SCTP_ADDR_OVER is set, there must be an address
1669 * specified in msg_name.
1671 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1678 SCTP_DEBUG_PRINTK("About to look up association.\n");
1682 /* If a msg_name has been specified, assume this is to be used. */
1684 /* Look for a matching association on the endpoint. */
1685 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1687 /* If we could not find a matching association on the
1688 * endpoint, make sure that it is not a TCP-style
1689 * socket that already has an association or there is
1690 * no peeled-off association on another socket.
1692 if ((sctp_style(sk
, TCP
) &&
1693 sctp_sstate(sk
, ESTABLISHED
)) ||
1694 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1695 err
= -EADDRNOTAVAIL
;
1700 asoc
= sctp_id2assoc(sk
, associd
);
1708 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1710 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1711 * socket that has an association in CLOSED state. This can
1712 * happen when an accepted socket has an association that is
1715 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1720 if (sinfo_flags
& SCTP_EOF
) {
1721 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1723 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1727 if (sinfo_flags
& SCTP_ABORT
) {
1729 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1735 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1736 sctp_primitive_ABORT(net
, asoc
, chunk
);
1742 /* Do we need to create the association? */
1744 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1746 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1751 /* Check for invalid stream against the stream counts,
1752 * either the default or the user specified stream counts.
1755 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1756 /* Check against the defaults. */
1757 if (sinfo
->sinfo_stream
>=
1758 sp
->initmsg
.sinit_num_ostreams
) {
1763 /* Check against the requested. */
1764 if (sinfo
->sinfo_stream
>=
1765 sinit
->sinit_num_ostreams
) {
1773 * API 3.1.2 bind() - UDP Style Syntax
1774 * If a bind() or sctp_bindx() is not called prior to a
1775 * sendmsg() call that initiates a new association, the
1776 * system picks an ephemeral port and will choose an address
1777 * set equivalent to binding with a wildcard address.
1779 if (!ep
->base
.bind_addr
.port
) {
1780 if (sctp_autobind(sk
)) {
1786 * If an unprivileged user inherits a one-to-many
1787 * style socket with open associations on a privileged
1788 * port, it MAY be permitted to accept new associations,
1789 * but it SHOULD NOT be permitted to open new
1792 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1793 !capable(CAP_NET_BIND_SERVICE
)) {
1799 scope
= sctp_scope(&to
);
1800 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1806 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
, GFP_KERNEL
);
1812 /* If the SCTP_INIT ancillary data is specified, set all
1813 * the association init values accordingly.
1816 if (sinit
->sinit_num_ostreams
) {
1817 asoc
->c
.sinit_num_ostreams
=
1818 sinit
->sinit_num_ostreams
;
1820 if (sinit
->sinit_max_instreams
) {
1821 asoc
->c
.sinit_max_instreams
=
1822 sinit
->sinit_max_instreams
;
1824 if (sinit
->sinit_max_attempts
) {
1825 asoc
->max_init_attempts
1826 = sinit
->sinit_max_attempts
;
1828 if (sinit
->sinit_max_init_timeo
) {
1829 asoc
->max_init_timeo
=
1830 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1834 /* Prime the peer's transport structures. */
1835 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1842 /* ASSERT: we have a valid association at this point. */
1843 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1846 /* If the user didn't specify SNDRCVINFO, make up one with
1849 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1850 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1851 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1852 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1853 default_sinfo
.sinfo_context
= asoc
->default_context
;
1854 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1855 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1856 sinfo
= &default_sinfo
;
1859 /* API 7.1.7, the sndbuf size per association bounds the
1860 * maximum size of data that can be sent in a single send call.
1862 if (msg_len
> sk
->sk_sndbuf
) {
1867 if (asoc
->pmtu_pending
)
1868 sctp_assoc_pending_pmtu(sk
, asoc
);
1870 /* If fragmentation is disabled and the message length exceeds the
1871 * association fragmentation point, return EMSGSIZE. The I-D
1872 * does not specify what this error is, but this looks like
1875 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1880 /* Check for invalid stream. */
1881 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1886 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1887 if (!sctp_wspace(asoc
)) {
1888 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1893 /* If an address is passed with the sendto/sendmsg call, it is used
1894 * to override the primary destination address in the TCP model, or
1895 * when SCTP_ADDR_OVER flag is set in the UDP model.
1897 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1898 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1899 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1907 /* Auto-connect, if we aren't connected already. */
1908 if (sctp_state(asoc
, CLOSED
)) {
1909 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1912 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1915 /* Break the message into multiple chunks of maximum size. */
1916 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1922 /* Now send the (possibly) fragmented message. */
1923 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1924 sctp_chunk_hold(chunk
);
1926 /* Do accounting for the write space. */
1927 sctp_set_owner_w(chunk
);
1929 chunk
->transport
= chunk_tp
;
1932 /* Send it to the lower layers. Note: all chunks
1933 * must either fail or succeed. The lower layer
1934 * works that way today. Keep it that way or this
1937 err
= sctp_primitive_SEND(net
, asoc
, datamsg
);
1938 /* Did the lower layer accept the chunk? */
1940 sctp_datamsg_free(datamsg
);
1942 sctp_datamsg_put(datamsg
);
1944 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1951 /* If we are already past ASSOCIATE, the lower
1952 * layers are responsible for association cleanup.
1958 sctp_unhash_established(asoc
);
1959 sctp_association_free(asoc
);
1962 sctp_release_sock(sk
);
1965 return sctp_error(sk
, msg_flags
, err
);
1972 err
= sock_error(sk
);
1982 /* This is an extended version of skb_pull() that removes the data from the
1983 * start of a skb even when data is spread across the list of skb's in the
1984 * frag_list. len specifies the total amount of data that needs to be removed.
1985 * when 'len' bytes could be removed from the skb, it returns 0.
1986 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1987 * could not be removed.
1989 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1991 struct sk_buff
*list
;
1992 int skb_len
= skb_headlen(skb
);
1995 if (len
<= skb_len
) {
1996 __skb_pull(skb
, len
);
2000 __skb_pull(skb
, skb_len
);
2002 skb_walk_frags(skb
, list
) {
2003 rlen
= sctp_skb_pull(list
, len
);
2004 skb
->len
-= (len
-rlen
);
2005 skb
->data_len
-= (len
-rlen
);
2016 /* API 3.1.3 recvmsg() - UDP Style Syntax
2018 * ssize_t recvmsg(int socket, struct msghdr *message,
2021 * socket - the socket descriptor of the endpoint.
2022 * message - pointer to the msghdr structure which contains a single
2023 * user message and possibly some ancillary data.
2025 * See Section 5 for complete description of the data
2028 * flags - flags sent or received with the user message, see Section
2029 * 5 for complete description of the flags.
2031 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
2033 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
2034 struct msghdr
*msg
, size_t len
, int noblock
,
2035 int flags
, int *addr_len
)
2037 struct sctp_ulpevent
*event
= NULL
;
2038 struct sctp_sock
*sp
= sctp_sk(sk
);
2039 struct sk_buff
*skb
;
2044 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
2045 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
2046 "len", len
, "knoblauch", noblock
,
2047 "flags", flags
, "addr_len", addr_len
);
2051 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
2056 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
2060 /* Get the total length of the skb including any skb's in the
2069 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
2071 event
= sctp_skb2event(skb
);
2076 sock_recv_ts_and_drops(msg
, sk
, skb
);
2077 if (sctp_ulpevent_is_notification(event
)) {
2078 msg
->msg_flags
|= MSG_NOTIFICATION
;
2079 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
2081 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
2084 /* Check if we allow SCTP_SNDRCVINFO. */
2085 if (sp
->subscribe
.sctp_data_io_event
)
2086 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
2088 /* FIXME: we should be calling IP/IPv6 layers. */
2089 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
2090 ip_cmsg_recv(msg
, skb
);
2095 /* If skb's length exceeds the user's buffer, update the skb and
2096 * push it back to the receive_queue so that the next call to
2097 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2099 if (skb_len
> copied
) {
2100 msg
->msg_flags
&= ~MSG_EOR
;
2101 if (flags
& MSG_PEEK
)
2103 sctp_skb_pull(skb
, copied
);
2104 skb_queue_head(&sk
->sk_receive_queue
, skb
);
2106 /* When only partial message is copied to the user, increase
2107 * rwnd by that amount. If all the data in the skb is read,
2108 * rwnd is updated when the event is freed.
2110 if (!sctp_ulpevent_is_notification(event
))
2111 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
2113 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
2114 (event
->msg_flags
& MSG_EOR
))
2115 msg
->msg_flags
|= MSG_EOR
;
2117 msg
->msg_flags
&= ~MSG_EOR
;
2120 if (flags
& MSG_PEEK
) {
2121 /* Release the skb reference acquired after peeking the skb in
2122 * sctp_skb_recv_datagram().
2126 /* Free the event which includes releasing the reference to
2127 * the owner of the skb, freeing the skb and updating the
2130 sctp_ulpevent_free(event
);
2133 sctp_release_sock(sk
);
2137 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2139 * This option is a on/off flag. If enabled no SCTP message
2140 * fragmentation will be performed. Instead if a message being sent
2141 * exceeds the current PMTU size, the message will NOT be sent and
2142 * instead a error will be indicated to the user.
2144 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
2145 char __user
*optval
,
2146 unsigned int optlen
)
2150 if (optlen
< sizeof(int))
2153 if (get_user(val
, (int __user
*)optval
))
2156 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
2161 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2162 unsigned int optlen
)
2164 struct sctp_association
*asoc
;
2165 struct sctp_ulpevent
*event
;
2167 if (optlen
> sizeof(struct sctp_event_subscribe
))
2169 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2173 * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2174 * if there is no data to be sent or retransmit, the stack will
2175 * immediately send up this notification.
2177 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT
,
2178 &sctp_sk(sk
)->subscribe
)) {
2179 asoc
= sctp_id2assoc(sk
, 0);
2181 if (asoc
&& sctp_outq_is_empty(&asoc
->outqueue
)) {
2182 event
= sctp_ulpevent_make_sender_dry_event(asoc
,
2187 sctp_ulpq_tail_event(&asoc
->ulpq
, event
);
2194 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2196 * This socket option is applicable to the UDP-style socket only. When
2197 * set it will cause associations that are idle for more than the
2198 * specified number of seconds to automatically close. An association
2199 * being idle is defined an association that has NOT sent or received
2200 * user data. The special value of '0' indicates that no automatic
2201 * close of any associations should be performed. The option expects an
2202 * integer defining the number of seconds of idle time before an
2203 * association is closed.
2205 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2206 unsigned int optlen
)
2208 struct sctp_sock
*sp
= sctp_sk(sk
);
2210 /* Applicable to UDP-style socket only */
2211 if (sctp_style(sk
, TCP
))
2213 if (optlen
!= sizeof(int))
2215 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2221 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2223 * Applications can enable or disable heartbeats for any peer address of
2224 * an association, modify an address's heartbeat interval, force a
2225 * heartbeat to be sent immediately, and adjust the address's maximum
2226 * number of retransmissions sent before an address is considered
2227 * unreachable. The following structure is used to access and modify an
2228 * address's parameters:
2230 * struct sctp_paddrparams {
2231 * sctp_assoc_t spp_assoc_id;
2232 * struct sockaddr_storage spp_address;
2233 * uint32_t spp_hbinterval;
2234 * uint16_t spp_pathmaxrxt;
2235 * uint32_t spp_pathmtu;
2236 * uint32_t spp_sackdelay;
2237 * uint32_t spp_flags;
2240 * spp_assoc_id - (one-to-many style socket) This is filled in the
2241 * application, and identifies the association for
2243 * spp_address - This specifies which address is of interest.
2244 * spp_hbinterval - This contains the value of the heartbeat interval,
2245 * in milliseconds. If a value of zero
2246 * is present in this field then no changes are to
2247 * be made to this parameter.
2248 * spp_pathmaxrxt - This contains the maximum number of
2249 * retransmissions before this address shall be
2250 * considered unreachable. If a value of zero
2251 * is present in this field then no changes are to
2252 * be made to this parameter.
2253 * spp_pathmtu - When Path MTU discovery is disabled the value
2254 * specified here will be the "fixed" path mtu.
2255 * Note that if the spp_address field is empty
2256 * then all associations on this address will
2257 * have this fixed path mtu set upon them.
2259 * spp_sackdelay - When delayed sack is enabled, this value specifies
2260 * the number of milliseconds that sacks will be delayed
2261 * for. This value will apply to all addresses of an
2262 * association if the spp_address field is empty. Note
2263 * also, that if delayed sack is enabled and this
2264 * value is set to 0, no change is made to the last
2265 * recorded delayed sack timer value.
2267 * spp_flags - These flags are used to control various features
2268 * on an association. The flag field may contain
2269 * zero or more of the following options.
2271 * SPP_HB_ENABLE - Enable heartbeats on the
2272 * specified address. Note that if the address
2273 * field is empty all addresses for the association
2274 * have heartbeats enabled upon them.
2276 * SPP_HB_DISABLE - Disable heartbeats on the
2277 * speicifed address. Note that if the address
2278 * field is empty all addresses for the association
2279 * will have their heartbeats disabled. Note also
2280 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2281 * mutually exclusive, only one of these two should
2282 * be specified. Enabling both fields will have
2283 * undetermined results.
2285 * SPP_HB_DEMAND - Request a user initiated heartbeat
2286 * to be made immediately.
2288 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2289 * heartbeat delayis to be set to the value of 0
2292 * SPP_PMTUD_ENABLE - This field will enable PMTU
2293 * discovery upon the specified address. Note that
2294 * if the address feild is empty then all addresses
2295 * on the association are effected.
2297 * SPP_PMTUD_DISABLE - This field will disable PMTU
2298 * discovery upon the specified address. Note that
2299 * if the address feild is empty then all addresses
2300 * on the association are effected. Not also that
2301 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2302 * exclusive. Enabling both will have undetermined
2305 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2306 * on delayed sack. The time specified in spp_sackdelay
2307 * is used to specify the sack delay for this address. Note
2308 * that if spp_address is empty then all addresses will
2309 * enable delayed sack and take on the sack delay
2310 * value specified in spp_sackdelay.
2311 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2312 * off delayed sack. If the spp_address field is blank then
2313 * delayed sack is disabled for the entire association. Note
2314 * also that this field is mutually exclusive to
2315 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2318 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2319 struct sctp_transport
*trans
,
2320 struct sctp_association
*asoc
,
2321 struct sctp_sock
*sp
,
2324 int sackdelay_change
)
2328 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2329 struct net
*net
= sock_net(trans
->asoc
->base
.sk
);
2331 error
= sctp_primitive_REQUESTHEARTBEAT(net
, trans
->asoc
, trans
);
2336 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2337 * this field is ignored. Note also that a value of zero indicates
2338 * the current setting should be left unchanged.
2340 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2342 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2343 * set. This lets us use 0 value when this flag
2346 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2347 params
->spp_hbinterval
= 0;
2349 if (params
->spp_hbinterval
||
2350 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2353 msecs_to_jiffies(params
->spp_hbinterval
);
2356 msecs_to_jiffies(params
->spp_hbinterval
);
2358 sp
->hbinterval
= params
->spp_hbinterval
;
2365 trans
->param_flags
=
2366 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2369 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2372 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2376 /* When Path MTU discovery is disabled the value specified here will
2377 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2378 * include the flag SPP_PMTUD_DISABLE for this field to have any
2381 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2383 trans
->pathmtu
= params
->spp_pathmtu
;
2384 sctp_assoc_sync_pmtu(sctp_opt2sk(sp
), asoc
);
2386 asoc
->pathmtu
= params
->spp_pathmtu
;
2387 sctp_frag_point(asoc
, params
->spp_pathmtu
);
2389 sp
->pathmtu
= params
->spp_pathmtu
;
2395 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2396 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2397 trans
->param_flags
=
2398 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2400 sctp_transport_pmtu(trans
, sctp_opt2sk(sp
));
2401 sctp_assoc_sync_pmtu(sctp_opt2sk(sp
), asoc
);
2405 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2408 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2412 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2413 * value of this field is ignored. Note also that a value of zero
2414 * indicates the current setting should be left unchanged.
2416 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2419 msecs_to_jiffies(params
->spp_sackdelay
);
2422 msecs_to_jiffies(params
->spp_sackdelay
);
2424 sp
->sackdelay
= params
->spp_sackdelay
;
2428 if (sackdelay_change
) {
2430 trans
->param_flags
=
2431 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2435 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2439 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2444 /* Note that a value of zero indicates the current setting should be
2447 if (params
->spp_pathmaxrxt
) {
2449 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2451 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2453 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2460 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2461 char __user
*optval
,
2462 unsigned int optlen
)
2464 struct sctp_paddrparams params
;
2465 struct sctp_transport
*trans
= NULL
;
2466 struct sctp_association
*asoc
= NULL
;
2467 struct sctp_sock
*sp
= sctp_sk(sk
);
2469 int hb_change
, pmtud_change
, sackdelay_change
;
2471 if (optlen
!= sizeof(struct sctp_paddrparams
))
2474 if (copy_from_user(¶ms
, optval
, optlen
))
2477 /* Validate flags and value parameters. */
2478 hb_change
= params
.spp_flags
& SPP_HB
;
2479 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2480 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2482 if (hb_change
== SPP_HB
||
2483 pmtud_change
== SPP_PMTUD
||
2484 sackdelay_change
== SPP_SACKDELAY
||
2485 params
.spp_sackdelay
> 500 ||
2486 (params
.spp_pathmtu
&&
2487 params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2490 /* If an address other than INADDR_ANY is specified, and
2491 * no transport is found, then the request is invalid.
2493 if (!sctp_is_any(sk
, ( union sctp_addr
*)¶ms
.spp_address
)) {
2494 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2495 params
.spp_assoc_id
);
2500 /* Get association, if assoc_id != 0 and the socket is a one
2501 * to many style socket, and an association was not found, then
2502 * the id was invalid.
2504 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2505 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2508 /* Heartbeat demand can only be sent on a transport or
2509 * association, but not a socket.
2511 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2514 /* Process parameters. */
2515 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2516 hb_change
, pmtud_change
,
2522 /* If changes are for association, also apply parameters to each
2525 if (!trans
&& asoc
) {
2526 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2528 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2529 hb_change
, pmtud_change
,
2538 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2540 * This option will effect the way delayed acks are performed. This
2541 * option allows you to get or set the delayed ack time, in
2542 * milliseconds. It also allows changing the delayed ack frequency.
2543 * Changing the frequency to 1 disables the delayed sack algorithm. If
2544 * the assoc_id is 0, then this sets or gets the endpoints default
2545 * values. If the assoc_id field is non-zero, then the set or get
2546 * effects the specified association for the one to many model (the
2547 * assoc_id field is ignored by the one to one model). Note that if
2548 * sack_delay or sack_freq are 0 when setting this option, then the
2549 * current values will remain unchanged.
2551 * struct sctp_sack_info {
2552 * sctp_assoc_t sack_assoc_id;
2553 * uint32_t sack_delay;
2554 * uint32_t sack_freq;
2557 * sack_assoc_id - This parameter, indicates which association the user
2558 * is performing an action upon. Note that if this field's value is
2559 * zero then the endpoints default value is changed (effecting future
2560 * associations only).
2562 * sack_delay - This parameter contains the number of milliseconds that
2563 * the user is requesting the delayed ACK timer be set to. Note that
2564 * this value is defined in the standard to be between 200 and 500
2567 * sack_freq - This parameter contains the number of packets that must
2568 * be received before a sack is sent without waiting for the delay
2569 * timer to expire. The default value for this is 2, setting this
2570 * value to 1 will disable the delayed sack algorithm.
2573 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2574 char __user
*optval
, unsigned int optlen
)
2576 struct sctp_sack_info params
;
2577 struct sctp_transport
*trans
= NULL
;
2578 struct sctp_association
*asoc
= NULL
;
2579 struct sctp_sock
*sp
= sctp_sk(sk
);
2581 if (optlen
== sizeof(struct sctp_sack_info
)) {
2582 if (copy_from_user(¶ms
, optval
, optlen
))
2585 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2587 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2588 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2589 pr_warn("Use struct sctp_sack_info instead\n");
2590 if (copy_from_user(¶ms
, optval
, optlen
))
2593 if (params
.sack_delay
== 0)
2594 params
.sack_freq
= 1;
2596 params
.sack_freq
= 0;
2600 /* Validate value parameter. */
2601 if (params
.sack_delay
> 500)
2604 /* Get association, if sack_assoc_id != 0 and the socket is a one
2605 * to many style socket, and an association was not found, then
2606 * the id was invalid.
2608 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2609 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2612 if (params
.sack_delay
) {
2615 msecs_to_jiffies(params
.sack_delay
);
2617 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2618 SPP_SACKDELAY_ENABLE
;
2620 sp
->sackdelay
= params
.sack_delay
;
2622 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2623 SPP_SACKDELAY_ENABLE
;
2627 if (params
.sack_freq
== 1) {
2630 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2631 SPP_SACKDELAY_DISABLE
;
2634 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2635 SPP_SACKDELAY_DISABLE
;
2637 } else if (params
.sack_freq
> 1) {
2639 asoc
->sackfreq
= params
.sack_freq
;
2641 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2642 SPP_SACKDELAY_ENABLE
;
2644 sp
->sackfreq
= params
.sack_freq
;
2646 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2647 SPP_SACKDELAY_ENABLE
;
2651 /* If change is for association, also apply to each transport. */
2653 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2655 if (params
.sack_delay
) {
2657 msecs_to_jiffies(params
.sack_delay
);
2658 trans
->param_flags
=
2659 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2660 SPP_SACKDELAY_ENABLE
;
2662 if (params
.sack_freq
== 1) {
2663 trans
->param_flags
=
2664 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2665 SPP_SACKDELAY_DISABLE
;
2666 } else if (params
.sack_freq
> 1) {
2667 trans
->sackfreq
= params
.sack_freq
;
2668 trans
->param_flags
=
2669 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2670 SPP_SACKDELAY_ENABLE
;
2678 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2680 * Applications can specify protocol parameters for the default association
2681 * initialization. The option name argument to setsockopt() and getsockopt()
2684 * Setting initialization parameters is effective only on an unconnected
2685 * socket (for UDP-style sockets only future associations are effected
2686 * by the change). With TCP-style sockets, this option is inherited by
2687 * sockets derived from a listener socket.
2689 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2691 struct sctp_initmsg sinit
;
2692 struct sctp_sock
*sp
= sctp_sk(sk
);
2694 if (optlen
!= sizeof(struct sctp_initmsg
))
2696 if (copy_from_user(&sinit
, optval
, optlen
))
2699 if (sinit
.sinit_num_ostreams
)
2700 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2701 if (sinit
.sinit_max_instreams
)
2702 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2703 if (sinit
.sinit_max_attempts
)
2704 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2705 if (sinit
.sinit_max_init_timeo
)
2706 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2712 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2714 * Applications that wish to use the sendto() system call may wish to
2715 * specify a default set of parameters that would normally be supplied
2716 * through the inclusion of ancillary data. This socket option allows
2717 * such an application to set the default sctp_sndrcvinfo structure.
2718 * The application that wishes to use this socket option simply passes
2719 * in to this call the sctp_sndrcvinfo structure defined in Section
2720 * 5.2.2) The input parameters accepted by this call include
2721 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2722 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2723 * to this call if the caller is using the UDP model.
2725 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2726 char __user
*optval
,
2727 unsigned int optlen
)
2729 struct sctp_sndrcvinfo info
;
2730 struct sctp_association
*asoc
;
2731 struct sctp_sock
*sp
= sctp_sk(sk
);
2733 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2735 if (copy_from_user(&info
, optval
, optlen
))
2738 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2739 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2743 asoc
->default_stream
= info
.sinfo_stream
;
2744 asoc
->default_flags
= info
.sinfo_flags
;
2745 asoc
->default_ppid
= info
.sinfo_ppid
;
2746 asoc
->default_context
= info
.sinfo_context
;
2747 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2749 sp
->default_stream
= info
.sinfo_stream
;
2750 sp
->default_flags
= info
.sinfo_flags
;
2751 sp
->default_ppid
= info
.sinfo_ppid
;
2752 sp
->default_context
= info
.sinfo_context
;
2753 sp
->default_timetolive
= info
.sinfo_timetolive
;
2759 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2761 * Requests that the local SCTP stack use the enclosed peer address as
2762 * the association primary. The enclosed address must be one of the
2763 * association peer's addresses.
2765 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2766 unsigned int optlen
)
2768 struct sctp_prim prim
;
2769 struct sctp_transport
*trans
;
2771 if (optlen
!= sizeof(struct sctp_prim
))
2774 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2777 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2781 sctp_assoc_set_primary(trans
->asoc
, trans
);
2787 * 7.1.5 SCTP_NODELAY
2789 * Turn on/off any Nagle-like algorithm. This means that packets are
2790 * generally sent as soon as possible and no unnecessary delays are
2791 * introduced, at the cost of more packets in the network. Expects an
2792 * integer boolean flag.
2794 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2795 unsigned int optlen
)
2799 if (optlen
< sizeof(int))
2801 if (get_user(val
, (int __user
*)optval
))
2804 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2810 * 7.1.1 SCTP_RTOINFO
2812 * The protocol parameters used to initialize and bound retransmission
2813 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2814 * and modify these parameters.
2815 * All parameters are time values, in milliseconds. A value of 0, when
2816 * modifying the parameters, indicates that the current value should not
2820 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2822 struct sctp_rtoinfo rtoinfo
;
2823 struct sctp_association
*asoc
;
2825 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2828 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2831 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2833 /* Set the values to the specific association */
2834 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2838 if (rtoinfo
.srto_initial
!= 0)
2840 msecs_to_jiffies(rtoinfo
.srto_initial
);
2841 if (rtoinfo
.srto_max
!= 0)
2842 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2843 if (rtoinfo
.srto_min
!= 0)
2844 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2846 /* If there is no association or the association-id = 0
2847 * set the values to the endpoint.
2849 struct sctp_sock
*sp
= sctp_sk(sk
);
2851 if (rtoinfo
.srto_initial
!= 0)
2852 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2853 if (rtoinfo
.srto_max
!= 0)
2854 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2855 if (rtoinfo
.srto_min
!= 0)
2856 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2864 * 7.1.2 SCTP_ASSOCINFO
2866 * This option is used to tune the maximum retransmission attempts
2867 * of the association.
2868 * Returns an error if the new association retransmission value is
2869 * greater than the sum of the retransmission value of the peer.
2870 * See [SCTP] for more information.
2873 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2876 struct sctp_assocparams assocparams
;
2877 struct sctp_association
*asoc
;
2879 if (optlen
!= sizeof(struct sctp_assocparams
))
2881 if (copy_from_user(&assocparams
, optval
, optlen
))
2884 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2886 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2889 /* Set the values to the specific association */
2891 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2894 struct sctp_transport
*peer_addr
;
2896 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
2898 path_sum
+= peer_addr
->pathmaxrxt
;
2902 /* Only validate asocmaxrxt if we have more than
2903 * one path/transport. We do this because path
2904 * retransmissions are only counted when we have more
2908 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2911 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2914 if (assocparams
.sasoc_cookie_life
!= 0) {
2915 asoc
->cookie_life
.tv_sec
=
2916 assocparams
.sasoc_cookie_life
/ 1000;
2917 asoc
->cookie_life
.tv_usec
=
2918 (assocparams
.sasoc_cookie_life
% 1000)
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 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
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 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3565 char __user
*optval
, unsigned int optlen
)
3569 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3572 /* I can hardly begin to describe how wrong this is. This is
3573 * so broken as to be worse than useless. The API draft
3574 * REALLY is NOT helpful here... I am not convinced that the
3575 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3576 * are at all well-founded.
3578 if (level
!= SOL_SCTP
) {
3579 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3580 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3587 case SCTP_SOCKOPT_BINDX_ADD
:
3588 /* 'optlen' is the size of the addresses buffer. */
3589 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3590 optlen
, SCTP_BINDX_ADD_ADDR
);
3593 case SCTP_SOCKOPT_BINDX_REM
:
3594 /* 'optlen' is the size of the addresses buffer. */
3595 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3596 optlen
, SCTP_BINDX_REM_ADDR
);
3599 case SCTP_SOCKOPT_CONNECTX_OLD
:
3600 /* 'optlen' is the size of the addresses buffer. */
3601 retval
= sctp_setsockopt_connectx_old(sk
,
3602 (struct sockaddr __user
*)optval
,
3606 case SCTP_SOCKOPT_CONNECTX
:
3607 /* 'optlen' is the size of the addresses buffer. */
3608 retval
= sctp_setsockopt_connectx(sk
,
3609 (struct sockaddr __user
*)optval
,
3613 case SCTP_DISABLE_FRAGMENTS
:
3614 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3618 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3621 case SCTP_AUTOCLOSE
:
3622 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3625 case SCTP_PEER_ADDR_PARAMS
:
3626 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3629 case SCTP_DELAYED_SACK
:
3630 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3632 case SCTP_PARTIAL_DELIVERY_POINT
:
3633 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3637 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3639 case SCTP_DEFAULT_SEND_PARAM
:
3640 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3643 case SCTP_PRIMARY_ADDR
:
3644 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3646 case SCTP_SET_PEER_PRIMARY_ADDR
:
3647 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3650 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3653 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3655 case SCTP_ASSOCINFO
:
3656 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3658 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3659 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3662 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3664 case SCTP_ADAPTATION_LAYER
:
3665 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3668 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3670 case SCTP_FRAGMENT_INTERLEAVE
:
3671 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3673 case SCTP_MAX_BURST
:
3674 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3676 case SCTP_AUTH_CHUNK
:
3677 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3679 case SCTP_HMAC_IDENT
:
3680 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3683 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3685 case SCTP_AUTH_ACTIVE_KEY
:
3686 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3688 case SCTP_AUTH_DELETE_KEY
:
3689 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3691 case SCTP_AUTO_ASCONF
:
3692 retval
= sctp_setsockopt_auto_asconf(sk
, optval
, optlen
);
3694 case SCTP_PEER_ADDR_THLDS
:
3695 retval
= sctp_setsockopt_paddr_thresholds(sk
, optval
, optlen
);
3698 retval
= -ENOPROTOOPT
;
3702 sctp_release_sock(sk
);
3708 /* API 3.1.6 connect() - UDP Style Syntax
3710 * An application may use the connect() call in the UDP model to initiate an
3711 * association without sending data.
3715 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3717 * sd: the socket descriptor to have a new association added to.
3719 * nam: the address structure (either struct sockaddr_in or struct
3720 * sockaddr_in6 defined in RFC2553 [7]).
3722 * len: the size of the address.
3724 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3732 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3733 __func__
, sk
, addr
, addr_len
);
3735 /* Validate addr_len before calling common connect/connectx routine. */
3736 af
= sctp_get_af_specific(addr
->sa_family
);
3737 if (!af
|| addr_len
< af
->sockaddr_len
) {
3740 /* Pass correct addr len to common routine (so it knows there
3741 * is only one address being passed.
3743 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
3746 sctp_release_sock(sk
);
3750 /* FIXME: Write comments. */
3751 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
3753 return -EOPNOTSUPP
; /* STUB */
3756 /* 4.1.4 accept() - TCP Style Syntax
3758 * Applications use accept() call to remove an established SCTP
3759 * association from the accept queue of the endpoint. A new socket
3760 * descriptor will be returned from accept() to represent the newly
3761 * formed association.
3763 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3765 struct sctp_sock
*sp
;
3766 struct sctp_endpoint
*ep
;
3767 struct sock
*newsk
= NULL
;
3768 struct sctp_association
*asoc
;
3777 if (!sctp_style(sk
, TCP
)) {
3778 error
= -EOPNOTSUPP
;
3782 if (!sctp_sstate(sk
, LISTENING
)) {
3787 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3789 error
= sctp_wait_for_accept(sk
, timeo
);
3793 /* We treat the list of associations on the endpoint as the accept
3794 * queue and pick the first association on the list.
3796 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3798 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3804 /* Populate the fields of the newsk from the oldsk and migrate the
3805 * asoc to the newsk.
3807 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3810 sctp_release_sock(sk
);
3815 /* The SCTP ioctl handler. */
3816 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3823 * SEQPACKET-style sockets in LISTENING state are valid, for
3824 * SCTP, so only discard TCP-style sockets in LISTENING state.
3826 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
3831 struct sk_buff
*skb
;
3832 unsigned int amount
= 0;
3834 skb
= skb_peek(&sk
->sk_receive_queue
);
3837 * We will only return the amount of this packet since
3838 * that is all that will be read.
3842 rc
= put_user(amount
, (int __user
*)arg
);
3850 sctp_release_sock(sk
);
3854 /* This is the function which gets called during socket creation to
3855 * initialized the SCTP-specific portion of the sock.
3856 * The sock structure should already be zero-filled memory.
3858 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
3860 struct net
*net
= sock_net(sk
);
3861 struct sctp_endpoint
*ep
;
3862 struct sctp_sock
*sp
;
3864 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3868 /* Initialize the SCTP per socket area. */
3869 switch (sk
->sk_type
) {
3870 case SOCK_SEQPACKET
:
3871 sp
->type
= SCTP_SOCKET_UDP
;
3874 sp
->type
= SCTP_SOCKET_TCP
;
3877 return -ESOCKTNOSUPPORT
;
3880 /* Initialize default send parameters. These parameters can be
3881 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3883 sp
->default_stream
= 0;
3884 sp
->default_ppid
= 0;
3885 sp
->default_flags
= 0;
3886 sp
->default_context
= 0;
3887 sp
->default_timetolive
= 0;
3889 sp
->default_rcv_context
= 0;
3890 sp
->max_burst
= net
->sctp
.max_burst
;
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 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3975 SCTP_DBG_OBJCNT_INC(sock
);
3978 percpu_counter_inc(&sctp_sockets_allocated
);
3979 sock_prot_inuse_add(net
, sk
->sk_prot
, 1);
3980 if (net
->sctp
.default_auto_asconf
) {
3981 list_add_tail(&sp
->auto_asconf_list
,
3982 &net
->sctp
.auto_asconf_splist
);
3983 sp
->do_auto_asconf
= 1;
3985 sp
->do_auto_asconf
= 0;
3991 /* Cleanup any SCTP per socket resources. */
3992 SCTP_STATIC
void sctp_destroy_sock(struct sock
*sk
)
3994 struct sctp_sock
*sp
;
3996 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3998 /* Release our hold on the endpoint. */
4000 if (sp
->do_auto_asconf
) {
4001 sp
->do_auto_asconf
= 0;
4002 list_del(&sp
->auto_asconf_list
);
4004 sctp_endpoint_free(sp
->ep
);
4006 percpu_counter_dec(&sctp_sockets_allocated
);
4007 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
4011 /* API 4.1.7 shutdown() - TCP Style Syntax
4012 * int shutdown(int socket, int how);
4014 * sd - the socket descriptor of the association to be closed.
4015 * how - Specifies the type of shutdown. The values are
4018 * Disables further receive operations. No SCTP
4019 * protocol action is taken.
4021 * Disables further send operations, and initiates
4022 * the SCTP shutdown sequence.
4024 * Disables further send and receive operations
4025 * and initiates the SCTP shutdown sequence.
4027 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
4029 struct net
*net
= sock_net(sk
);
4030 struct sctp_endpoint
*ep
;
4031 struct sctp_association
*asoc
;
4033 if (!sctp_style(sk
, TCP
))
4036 if (how
& SEND_SHUTDOWN
) {
4037 ep
= sctp_sk(sk
)->ep
;
4038 if (!list_empty(&ep
->asocs
)) {
4039 asoc
= list_entry(ep
->asocs
.next
,
4040 struct sctp_association
, asocs
);
4041 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
4046 /* 7.2.1 Association Status (SCTP_STATUS)
4048 * Applications can retrieve current status information about an
4049 * association, including association state, peer receiver window size,
4050 * number of unacked data chunks, and number of data chunks pending
4051 * receipt. This information is read-only.
4053 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
4054 char __user
*optval
,
4057 struct sctp_status status
;
4058 struct sctp_association
*asoc
= NULL
;
4059 struct sctp_transport
*transport
;
4060 sctp_assoc_t associd
;
4063 if (len
< sizeof(status
)) {
4068 len
= sizeof(status
);
4069 if (copy_from_user(&status
, optval
, len
)) {
4074 associd
= status
.sstat_assoc_id
;
4075 asoc
= sctp_id2assoc(sk
, associd
);
4081 transport
= asoc
->peer
.primary_path
;
4083 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
4084 status
.sstat_state
= asoc
->state
;
4085 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
4086 status
.sstat_unackdata
= asoc
->unack_data
;
4088 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4089 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
4090 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
4091 status
.sstat_fragmentation_point
= asoc
->frag_point
;
4092 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4093 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
4094 transport
->af_specific
->sockaddr_len
);
4095 /* Map ipv4 address into v4-mapped-on-v6 address. */
4096 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4097 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
4098 status
.sstat_primary
.spinfo_state
= transport
->state
;
4099 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
4100 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
4101 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4102 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
4104 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
4105 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
4107 if (put_user(len
, optlen
)) {
4112 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
4113 len
, status
.sstat_state
, status
.sstat_rwnd
,
4114 status
.sstat_assoc_id
);
4116 if (copy_to_user(optval
, &status
, len
)) {
4126 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4128 * Applications can retrieve information about a specific peer address
4129 * of an association, including its reachability state, congestion
4130 * window, and retransmission timer values. This information is
4133 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
4134 char __user
*optval
,
4137 struct sctp_paddrinfo pinfo
;
4138 struct sctp_transport
*transport
;
4141 if (len
< sizeof(pinfo
)) {
4146 len
= sizeof(pinfo
);
4147 if (copy_from_user(&pinfo
, optval
, len
)) {
4152 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
4153 pinfo
.spinfo_assoc_id
);
4157 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4158 pinfo
.spinfo_state
= transport
->state
;
4159 pinfo
.spinfo_cwnd
= transport
->cwnd
;
4160 pinfo
.spinfo_srtt
= transport
->srtt
;
4161 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4162 pinfo
.spinfo_mtu
= transport
->pathmtu
;
4164 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
4165 pinfo
.spinfo_state
= SCTP_ACTIVE
;
4167 if (put_user(len
, optlen
)) {
4172 if (copy_to_user(optval
, &pinfo
, len
)) {
4181 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4183 * This option is a on/off flag. If enabled no SCTP message
4184 * fragmentation will be performed. Instead if a message being sent
4185 * exceeds the current PMTU size, the message will NOT be sent and
4186 * instead a error will be indicated to the user.
4188 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
4189 char __user
*optval
, int __user
*optlen
)
4193 if (len
< sizeof(int))
4197 val
= (sctp_sk(sk
)->disable_fragments
== 1);
4198 if (put_user(len
, optlen
))
4200 if (copy_to_user(optval
, &val
, len
))
4205 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4207 * This socket option is used to specify various notifications and
4208 * ancillary data the user wishes to receive.
4210 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
4215 if (len
> sizeof(struct sctp_event_subscribe
))
4216 len
= sizeof(struct sctp_event_subscribe
);
4217 if (put_user(len
, optlen
))
4219 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
4224 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4226 * This socket option is applicable to the UDP-style socket only. When
4227 * set it will cause associations that are idle for more than the
4228 * specified number of seconds to automatically close. An association
4229 * being idle is defined an association that has NOT sent or received
4230 * user data. The special value of '0' indicates that no automatic
4231 * close of any associations should be performed. The option expects an
4232 * integer defining the number of seconds of idle time before an
4233 * association is closed.
4235 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4237 /* Applicable to UDP-style socket only */
4238 if (sctp_style(sk
, TCP
))
4240 if (len
< sizeof(int))
4243 if (put_user(len
, optlen
))
4245 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
4250 /* Helper routine to branch off an association to a new socket. */
4251 int sctp_do_peeloff(struct sock
*sk
, sctp_assoc_t id
, struct socket
**sockp
)
4253 struct sctp_association
*asoc
= sctp_id2assoc(sk
, id
);
4254 struct socket
*sock
;
4261 /* An association cannot be branched off from an already peeled-off
4262 * socket, nor is this supported for tcp style sockets.
4264 if (!sctp_style(sk
, UDP
))
4267 /* Create a new socket. */
4268 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
4272 sctp_copy_sock(sock
->sk
, sk
, asoc
);
4274 /* Make peeled-off sockets more like 1-1 accepted sockets.
4275 * Set the daddr and initialize id to something more random
4277 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
4278 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
4280 /* Populate the fields of the newsk from the oldsk and migrate the
4281 * asoc to the newsk.
4283 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
4289 EXPORT_SYMBOL(sctp_do_peeloff
);
4291 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4293 sctp_peeloff_arg_t peeloff
;
4294 struct socket
*newsock
;
4297 if (len
< sizeof(sctp_peeloff_arg_t
))
4299 len
= sizeof(sctp_peeloff_arg_t
);
4300 if (copy_from_user(&peeloff
, optval
, len
))
4303 retval
= sctp_do_peeloff(sk
, peeloff
.associd
, &newsock
);
4307 /* Map the socket to an unused fd that can be returned to the user. */
4308 retval
= sock_map_fd(newsock
, 0);
4310 sock_release(newsock
);
4314 SCTP_DEBUG_PRINTK("%s: sk: %p newsk: %p sd: %d\n",
4315 __func__
, sk
, newsock
->sk
, retval
);
4317 /* Return the fd mapped to the new socket. */
4318 peeloff
.sd
= retval
;
4319 if (put_user(len
, optlen
))
4321 if (copy_to_user(optval
, &peeloff
, len
))
4328 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4330 * Applications can enable or disable heartbeats for any peer address of
4331 * an association, modify an address's heartbeat interval, force a
4332 * heartbeat to be sent immediately, and adjust the address's maximum
4333 * number of retransmissions sent before an address is considered
4334 * unreachable. The following structure is used to access and modify an
4335 * address's parameters:
4337 * struct sctp_paddrparams {
4338 * sctp_assoc_t spp_assoc_id;
4339 * struct sockaddr_storage spp_address;
4340 * uint32_t spp_hbinterval;
4341 * uint16_t spp_pathmaxrxt;
4342 * uint32_t spp_pathmtu;
4343 * uint32_t spp_sackdelay;
4344 * uint32_t spp_flags;
4347 * spp_assoc_id - (one-to-many style socket) This is filled in the
4348 * application, and identifies the association for
4350 * spp_address - This specifies which address is of interest.
4351 * spp_hbinterval - This contains the value of the heartbeat interval,
4352 * in milliseconds. If a value of zero
4353 * is present in this field then no changes are to
4354 * be made to this parameter.
4355 * spp_pathmaxrxt - This contains the maximum number of
4356 * retransmissions before this address shall be
4357 * considered unreachable. If a value of zero
4358 * is present in this field then no changes are to
4359 * be made to this parameter.
4360 * spp_pathmtu - When Path MTU discovery is disabled the value
4361 * specified here will be the "fixed" path mtu.
4362 * Note that if the spp_address field is empty
4363 * then all associations on this address will
4364 * have this fixed path mtu set upon them.
4366 * spp_sackdelay - When delayed sack is enabled, this value specifies
4367 * the number of milliseconds that sacks will be delayed
4368 * for. This value will apply to all addresses of an
4369 * association if the spp_address field is empty. Note
4370 * also, that if delayed sack is enabled and this
4371 * value is set to 0, no change is made to the last
4372 * recorded delayed sack timer value.
4374 * spp_flags - These flags are used to control various features
4375 * on an association. The flag field may contain
4376 * zero or more of the following options.
4378 * SPP_HB_ENABLE - Enable heartbeats on the
4379 * specified address. Note that if the address
4380 * field is empty all addresses for the association
4381 * have heartbeats enabled upon them.
4383 * SPP_HB_DISABLE - Disable heartbeats on the
4384 * speicifed address. Note that if the address
4385 * field is empty all addresses for the association
4386 * will have their heartbeats disabled. Note also
4387 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4388 * mutually exclusive, only one of these two should
4389 * be specified. Enabling both fields will have
4390 * undetermined results.
4392 * SPP_HB_DEMAND - Request a user initiated heartbeat
4393 * to be made immediately.
4395 * SPP_PMTUD_ENABLE - This field will enable PMTU
4396 * discovery upon the specified address. Note that
4397 * if the address feild is empty then all addresses
4398 * on the association are effected.
4400 * SPP_PMTUD_DISABLE - This field will disable PMTU
4401 * discovery upon the specified address. Note that
4402 * if the address feild is empty then all addresses
4403 * on the association are effected. Not also that
4404 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4405 * exclusive. Enabling both will have undetermined
4408 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4409 * on delayed sack. The time specified in spp_sackdelay
4410 * is used to specify the sack delay for this address. Note
4411 * that if spp_address is empty then all addresses will
4412 * enable delayed sack and take on the sack delay
4413 * value specified in spp_sackdelay.
4414 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4415 * off delayed sack. If the spp_address field is blank then
4416 * delayed sack is disabled for the entire association. Note
4417 * also that this field is mutually exclusive to
4418 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4421 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
4422 char __user
*optval
, int __user
*optlen
)
4424 struct sctp_paddrparams params
;
4425 struct sctp_transport
*trans
= NULL
;
4426 struct sctp_association
*asoc
= NULL
;
4427 struct sctp_sock
*sp
= sctp_sk(sk
);
4429 if (len
< sizeof(struct sctp_paddrparams
))
4431 len
= sizeof(struct sctp_paddrparams
);
4432 if (copy_from_user(¶ms
, optval
, len
))
4435 /* If an address other than INADDR_ANY is specified, and
4436 * no transport is found, then the request is invalid.
4438 if (!sctp_is_any(sk
, ( union sctp_addr
*)¶ms
.spp_address
)) {
4439 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
4440 params
.spp_assoc_id
);
4442 SCTP_DEBUG_PRINTK("Failed no transport\n");
4447 /* Get association, if assoc_id != 0 and the socket is a one
4448 * to many style socket, and an association was not found, then
4449 * the id was invalid.
4451 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
4452 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
4453 SCTP_DEBUG_PRINTK("Failed no association\n");
4458 /* Fetch transport values. */
4459 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
4460 params
.spp_pathmtu
= trans
->pathmtu
;
4461 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
4462 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
4464 /*draft-11 doesn't say what to return in spp_flags*/
4465 params
.spp_flags
= trans
->param_flags
;
4467 /* Fetch association values. */
4468 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
4469 params
.spp_pathmtu
= asoc
->pathmtu
;
4470 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
4471 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
4473 /*draft-11 doesn't say what to return in spp_flags*/
4474 params
.spp_flags
= asoc
->param_flags
;
4476 /* Fetch socket values. */
4477 params
.spp_hbinterval
= sp
->hbinterval
;
4478 params
.spp_pathmtu
= sp
->pathmtu
;
4479 params
.spp_sackdelay
= sp
->sackdelay
;
4480 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
4482 /*draft-11 doesn't say what to return in spp_flags*/
4483 params
.spp_flags
= sp
->param_flags
;
4486 if (copy_to_user(optval
, ¶ms
, len
))
4489 if (put_user(len
, optlen
))
4496 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4498 * This option will effect the way delayed acks are performed. This
4499 * option allows you to get or set the delayed ack time, in
4500 * milliseconds. It also allows changing the delayed ack frequency.
4501 * Changing the frequency to 1 disables the delayed sack algorithm. If
4502 * the assoc_id is 0, then this sets or gets the endpoints default
4503 * values. If the assoc_id field is non-zero, then the set or get
4504 * effects the specified association for the one to many model (the
4505 * assoc_id field is ignored by the one to one model). Note that if
4506 * sack_delay or sack_freq are 0 when setting this option, then the
4507 * current values will remain unchanged.
4509 * struct sctp_sack_info {
4510 * sctp_assoc_t sack_assoc_id;
4511 * uint32_t sack_delay;
4512 * uint32_t sack_freq;
4515 * sack_assoc_id - This parameter, indicates which association the user
4516 * is performing an action upon. Note that if this field's value is
4517 * zero then the endpoints default value is changed (effecting future
4518 * associations only).
4520 * sack_delay - This parameter contains the number of milliseconds that
4521 * the user is requesting the delayed ACK timer be set to. Note that
4522 * this value is defined in the standard to be between 200 and 500
4525 * sack_freq - This parameter contains the number of packets that must
4526 * be received before a sack is sent without waiting for the delay
4527 * timer to expire. The default value for this is 2, setting this
4528 * value to 1 will disable the delayed sack algorithm.
4530 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
4531 char __user
*optval
,
4534 struct sctp_sack_info params
;
4535 struct sctp_association
*asoc
= NULL
;
4536 struct sctp_sock
*sp
= sctp_sk(sk
);
4538 if (len
>= sizeof(struct sctp_sack_info
)) {
4539 len
= sizeof(struct sctp_sack_info
);
4541 if (copy_from_user(¶ms
, optval
, len
))
4543 } else if (len
== sizeof(struct sctp_assoc_value
)) {
4544 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4545 pr_warn("Use struct sctp_sack_info instead\n");
4546 if (copy_from_user(¶ms
, optval
, len
))
4551 /* Get association, if sack_assoc_id != 0 and the socket is a one
4552 * to many style socket, and an association was not found, then
4553 * the id was invalid.
4555 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
4556 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
4560 /* Fetch association values. */
4561 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4562 params
.sack_delay
= jiffies_to_msecs(
4564 params
.sack_freq
= asoc
->sackfreq
;
4567 params
.sack_delay
= 0;
4568 params
.sack_freq
= 1;
4571 /* Fetch socket values. */
4572 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4573 params
.sack_delay
= sp
->sackdelay
;
4574 params
.sack_freq
= sp
->sackfreq
;
4576 params
.sack_delay
= 0;
4577 params
.sack_freq
= 1;
4581 if (copy_to_user(optval
, ¶ms
, len
))
4584 if (put_user(len
, optlen
))
4590 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4592 * Applications can specify protocol parameters for the default association
4593 * initialization. The option name argument to setsockopt() and getsockopt()
4596 * Setting initialization parameters is effective only on an unconnected
4597 * socket (for UDP-style sockets only future associations are effected
4598 * by the change). With TCP-style sockets, this option is inherited by
4599 * sockets derived from a listener socket.
4601 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4603 if (len
< sizeof(struct sctp_initmsg
))
4605 len
= sizeof(struct sctp_initmsg
);
4606 if (put_user(len
, optlen
))
4608 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
4614 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4615 char __user
*optval
, int __user
*optlen
)
4617 struct sctp_association
*asoc
;
4619 struct sctp_getaddrs getaddrs
;
4620 struct sctp_transport
*from
;
4622 union sctp_addr temp
;
4623 struct sctp_sock
*sp
= sctp_sk(sk
);
4628 if (len
< sizeof(struct sctp_getaddrs
))
4631 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4634 /* For UDP-style sockets, id specifies the association to query. */
4635 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4639 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4640 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4642 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
4644 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4645 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4646 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4647 if (space_left
< addrlen
)
4649 if (copy_to_user(to
, &temp
, addrlen
))
4653 space_left
-= addrlen
;
4656 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4658 bytes_copied
= ((char __user
*)to
) - optval
;
4659 if (put_user(bytes_copied
, optlen
))
4665 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4666 size_t space_left
, int *bytes_copied
)
4668 struct sctp_sockaddr_entry
*addr
;
4669 union sctp_addr temp
;
4672 struct net
*net
= sock_net(sk
);
4675 list_for_each_entry_rcu(addr
, &net
->sctp
.local_addr_list
, list
) {
4679 if ((PF_INET
== sk
->sk_family
) &&
4680 (AF_INET6
== addr
->a
.sa
.sa_family
))
4682 if ((PF_INET6
== sk
->sk_family
) &&
4683 inet_v6_ipv6only(sk
) &&
4684 (AF_INET
== addr
->a
.sa
.sa_family
))
4686 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4687 if (!temp
.v4
.sin_port
)
4688 temp
.v4
.sin_port
= htons(port
);
4690 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4692 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4693 if (space_left
< addrlen
) {
4697 memcpy(to
, &temp
, addrlen
);
4701 space_left
-= addrlen
;
4702 *bytes_copied
+= addrlen
;
4710 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4711 char __user
*optval
, int __user
*optlen
)
4713 struct sctp_bind_addr
*bp
;
4714 struct sctp_association
*asoc
;
4716 struct sctp_getaddrs getaddrs
;
4717 struct sctp_sockaddr_entry
*addr
;
4719 union sctp_addr temp
;
4720 struct sctp_sock
*sp
= sctp_sk(sk
);
4724 int bytes_copied
= 0;
4728 if (len
< sizeof(struct sctp_getaddrs
))
4731 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4735 * For UDP-style sockets, id specifies the association to query.
4736 * If the id field is set to the value '0' then the locally bound
4737 * addresses are returned without regard to any particular
4740 if (0 == getaddrs
.assoc_id
) {
4741 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4743 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4746 bp
= &asoc
->base
.bind_addr
;
4749 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4750 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4752 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4756 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4757 * addresses from the global local address list.
4759 if (sctp_list_single_entry(&bp
->address_list
)) {
4760 addr
= list_entry(bp
->address_list
.next
,
4761 struct sctp_sockaddr_entry
, list
);
4762 if (sctp_is_any(sk
, &addr
->a
)) {
4763 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4764 space_left
, &bytes_copied
);
4774 /* Protection on the bound address list is not needed since
4775 * in the socket option context we hold a socket lock and
4776 * thus the bound address list can't change.
4778 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4779 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4780 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4781 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4782 if (space_left
< addrlen
) {
4783 err
= -ENOMEM
; /*fixme: right error?*/
4786 memcpy(buf
, &temp
, addrlen
);
4788 bytes_copied
+= addrlen
;
4790 space_left
-= addrlen
;
4794 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4798 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4802 if (put_user(bytes_copied
, optlen
))
4809 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4811 * Requests that the local SCTP stack use the enclosed peer address as
4812 * the association primary. The enclosed address must be one of the
4813 * association peer's addresses.
4815 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4816 char __user
*optval
, int __user
*optlen
)
4818 struct sctp_prim prim
;
4819 struct sctp_association
*asoc
;
4820 struct sctp_sock
*sp
= sctp_sk(sk
);
4822 if (len
< sizeof(struct sctp_prim
))
4825 len
= sizeof(struct sctp_prim
);
4827 if (copy_from_user(&prim
, optval
, len
))
4830 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4834 if (!asoc
->peer
.primary_path
)
4837 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4838 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4840 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4841 (union sctp_addr
*)&prim
.ssp_addr
);
4843 if (put_user(len
, optlen
))
4845 if (copy_to_user(optval
, &prim
, len
))
4852 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4854 * Requests that the local endpoint set the specified Adaptation Layer
4855 * Indication parameter for all future INIT and INIT-ACK exchanges.
4857 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4858 char __user
*optval
, int __user
*optlen
)
4860 struct sctp_setadaptation adaptation
;
4862 if (len
< sizeof(struct sctp_setadaptation
))
4865 len
= sizeof(struct sctp_setadaptation
);
4867 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4869 if (put_user(len
, optlen
))
4871 if (copy_to_user(optval
, &adaptation
, len
))
4879 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4881 * Applications that wish to use the sendto() system call may wish to
4882 * specify a default set of parameters that would normally be supplied
4883 * through the inclusion of ancillary data. This socket option allows
4884 * such an application to set the default sctp_sndrcvinfo structure.
4887 * The application that wishes to use this socket option simply passes
4888 * in to this call the sctp_sndrcvinfo structure defined in Section
4889 * 5.2.2) The input parameters accepted by this call include
4890 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4891 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4892 * to this call if the caller is using the UDP model.
4894 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4896 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4897 int len
, char __user
*optval
,
4900 struct sctp_sndrcvinfo info
;
4901 struct sctp_association
*asoc
;
4902 struct sctp_sock
*sp
= sctp_sk(sk
);
4904 if (len
< sizeof(struct sctp_sndrcvinfo
))
4907 len
= sizeof(struct sctp_sndrcvinfo
);
4909 if (copy_from_user(&info
, optval
, len
))
4912 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4913 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4917 info
.sinfo_stream
= asoc
->default_stream
;
4918 info
.sinfo_flags
= asoc
->default_flags
;
4919 info
.sinfo_ppid
= asoc
->default_ppid
;
4920 info
.sinfo_context
= asoc
->default_context
;
4921 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4923 info
.sinfo_stream
= sp
->default_stream
;
4924 info
.sinfo_flags
= sp
->default_flags
;
4925 info
.sinfo_ppid
= sp
->default_ppid
;
4926 info
.sinfo_context
= sp
->default_context
;
4927 info
.sinfo_timetolive
= sp
->default_timetolive
;
4930 if (put_user(len
, optlen
))
4932 if (copy_to_user(optval
, &info
, len
))
4940 * 7.1.5 SCTP_NODELAY
4942 * Turn on/off any Nagle-like algorithm. This means that packets are
4943 * generally sent as soon as possible and no unnecessary delays are
4944 * introduced, at the cost of more packets in the network. Expects an
4945 * integer boolean flag.
4948 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4949 char __user
*optval
, int __user
*optlen
)
4953 if (len
< sizeof(int))
4957 val
= (sctp_sk(sk
)->nodelay
== 1);
4958 if (put_user(len
, optlen
))
4960 if (copy_to_user(optval
, &val
, len
))
4967 * 7.1.1 SCTP_RTOINFO
4969 * The protocol parameters used to initialize and bound retransmission
4970 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4971 * and modify these parameters.
4972 * All parameters are time values, in milliseconds. A value of 0, when
4973 * modifying the parameters, indicates that the current value should not
4977 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4978 char __user
*optval
,
4979 int __user
*optlen
) {
4980 struct sctp_rtoinfo rtoinfo
;
4981 struct sctp_association
*asoc
;
4983 if (len
< sizeof (struct sctp_rtoinfo
))
4986 len
= sizeof(struct sctp_rtoinfo
);
4988 if (copy_from_user(&rtoinfo
, optval
, len
))
4991 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4993 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4996 /* Values corresponding to the specific association. */
4998 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4999 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
5000 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
5002 /* Values corresponding to the endpoint. */
5003 struct sctp_sock
*sp
= sctp_sk(sk
);
5005 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
5006 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
5007 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
5010 if (put_user(len
, optlen
))
5013 if (copy_to_user(optval
, &rtoinfo
, len
))
5021 * 7.1.2 SCTP_ASSOCINFO
5023 * This option is used to tune the maximum retransmission attempts
5024 * of the association.
5025 * Returns an error if the new association retransmission value is
5026 * greater than the sum of the retransmission value of the peer.
5027 * See [SCTP] for more information.
5030 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
5031 char __user
*optval
,
5035 struct sctp_assocparams assocparams
;
5036 struct sctp_association
*asoc
;
5037 struct list_head
*pos
;
5040 if (len
< sizeof (struct sctp_assocparams
))
5043 len
= sizeof(struct sctp_assocparams
);
5045 if (copy_from_user(&assocparams
, optval
, len
))
5048 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
5050 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
5053 /* Values correspoinding to the specific association */
5055 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
5056 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
5057 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
5058 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
5060 (asoc
->cookie_life
.tv_usec
5063 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
5067 assocparams
.sasoc_number_peer_destinations
= cnt
;
5069 /* Values corresponding to the endpoint */
5070 struct sctp_sock
*sp
= sctp_sk(sk
);
5072 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
5073 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
5074 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
5075 assocparams
.sasoc_cookie_life
=
5076 sp
->assocparams
.sasoc_cookie_life
;
5077 assocparams
.sasoc_number_peer_destinations
=
5079 sasoc_number_peer_destinations
;
5082 if (put_user(len
, optlen
))
5085 if (copy_to_user(optval
, &assocparams
, len
))
5092 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5094 * This socket option is a boolean flag which turns on or off mapped V4
5095 * addresses. If this option is turned on and the socket is type
5096 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5097 * If this option is turned off, then no mapping will be done of V4
5098 * addresses and a user will receive both PF_INET6 and PF_INET type
5099 * addresses on the socket.
5101 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
5102 char __user
*optval
, int __user
*optlen
)
5105 struct sctp_sock
*sp
= sctp_sk(sk
);
5107 if (len
< sizeof(int))
5112 if (put_user(len
, optlen
))
5114 if (copy_to_user(optval
, &val
, len
))
5121 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5122 * (chapter and verse is quoted at sctp_setsockopt_context())
5124 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
5125 char __user
*optval
, int __user
*optlen
)
5127 struct sctp_assoc_value params
;
5128 struct sctp_sock
*sp
;
5129 struct sctp_association
*asoc
;
5131 if (len
< sizeof(struct sctp_assoc_value
))
5134 len
= sizeof(struct sctp_assoc_value
);
5136 if (copy_from_user(¶ms
, optval
, len
))
5141 if (params
.assoc_id
!= 0) {
5142 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5145 params
.assoc_value
= asoc
->default_rcv_context
;
5147 params
.assoc_value
= sp
->default_rcv_context
;
5150 if (put_user(len
, optlen
))
5152 if (copy_to_user(optval
, ¶ms
, len
))
5159 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5160 * This option will get or set the maximum size to put in any outgoing
5161 * SCTP DATA chunk. If a message is larger than this size it will be
5162 * fragmented by SCTP into the specified size. Note that the underlying
5163 * SCTP implementation may fragment into smaller sized chunks when the
5164 * PMTU of the underlying association is smaller than the value set by
5165 * the user. The default value for this option is '0' which indicates
5166 * the user is NOT limiting fragmentation and only the PMTU will effect
5167 * SCTP's choice of DATA chunk size. Note also that values set larger
5168 * than the maximum size of an IP datagram will effectively let SCTP
5169 * control fragmentation (i.e. the same as setting this option to 0).
5171 * The following structure is used to access and modify this parameter:
5173 * struct sctp_assoc_value {
5174 * sctp_assoc_t assoc_id;
5175 * uint32_t assoc_value;
5178 * assoc_id: This parameter is ignored for one-to-one style sockets.
5179 * For one-to-many style sockets this parameter indicates which
5180 * association the user is performing an action upon. Note that if
5181 * this field's value is zero then the endpoints default value is
5182 * changed (effecting future associations only).
5183 * assoc_value: This parameter specifies the maximum size in bytes.
5185 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
5186 char __user
*optval
, int __user
*optlen
)
5188 struct sctp_assoc_value params
;
5189 struct sctp_association
*asoc
;
5191 if (len
== sizeof(int)) {
5192 pr_warn("Use of int in maxseg socket option deprecated\n");
5193 pr_warn("Use struct sctp_assoc_value instead\n");
5194 params
.assoc_id
= 0;
5195 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5196 len
= sizeof(struct sctp_assoc_value
);
5197 if (copy_from_user(¶ms
, optval
, sizeof(params
)))
5202 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5203 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
5207 params
.assoc_value
= asoc
->frag_point
;
5209 params
.assoc_value
= sctp_sk(sk
)->user_frag
;
5211 if (put_user(len
, optlen
))
5213 if (len
== sizeof(int)) {
5214 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5217 if (copy_to_user(optval
, ¶ms
, len
))
5225 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5226 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5228 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
5229 char __user
*optval
, int __user
*optlen
)
5233 if (len
< sizeof(int))
5238 val
= sctp_sk(sk
)->frag_interleave
;
5239 if (put_user(len
, optlen
))
5241 if (copy_to_user(optval
, &val
, len
))
5248 * 7.1.25. Set or Get the sctp partial delivery point
5249 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5251 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
5252 char __user
*optval
,
5257 if (len
< sizeof(u32
))
5262 val
= sctp_sk(sk
)->pd_point
;
5263 if (put_user(len
, optlen
))
5265 if (copy_to_user(optval
, &val
, len
))
5272 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5273 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5275 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5276 char __user
*optval
,
5279 struct sctp_assoc_value params
;
5280 struct sctp_sock
*sp
;
5281 struct sctp_association
*asoc
;
5283 if (len
== sizeof(int)) {
5284 pr_warn("Use of int in max_burst socket option deprecated\n");
5285 pr_warn("Use struct sctp_assoc_value instead\n");
5286 params
.assoc_id
= 0;
5287 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5288 len
= sizeof(struct sctp_assoc_value
);
5289 if (copy_from_user(¶ms
, optval
, len
))
5296 if (params
.assoc_id
!= 0) {
5297 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5300 params
.assoc_value
= asoc
->max_burst
;
5302 params
.assoc_value
= sp
->max_burst
;
5304 if (len
== sizeof(int)) {
5305 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5308 if (copy_to_user(optval
, ¶ms
, len
))
5316 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5317 char __user
*optval
, int __user
*optlen
)
5319 struct net
*net
= sock_net(sk
);
5320 struct sctp_hmacalgo __user
*p
= (void __user
*)optval
;
5321 struct sctp_hmac_algo_param
*hmacs
;
5325 if (!net
->sctp
.auth_enable
)
5328 hmacs
= sctp_sk(sk
)->ep
->auth_hmacs_list
;
5329 data_len
= ntohs(hmacs
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5331 if (len
< sizeof(struct sctp_hmacalgo
) + data_len
)
5334 len
= sizeof(struct sctp_hmacalgo
) + data_len
;
5335 num_idents
= data_len
/ sizeof(u16
);
5337 if (put_user(len
, optlen
))
5339 if (put_user(num_idents
, &p
->shmac_num_idents
))
5341 if (copy_to_user(p
->shmac_idents
, hmacs
->hmac_ids
, data_len
))
5346 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5347 char __user
*optval
, int __user
*optlen
)
5349 struct net
*net
= sock_net(sk
);
5350 struct sctp_authkeyid val
;
5351 struct sctp_association
*asoc
;
5353 if (!net
->sctp
.auth_enable
)
5356 if (len
< sizeof(struct sctp_authkeyid
))
5358 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5361 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5362 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5366 val
.scact_keynumber
= asoc
->active_key_id
;
5368 val
.scact_keynumber
= sctp_sk(sk
)->ep
->active_key_id
;
5370 len
= sizeof(struct sctp_authkeyid
);
5371 if (put_user(len
, optlen
))
5373 if (copy_to_user(optval
, &val
, len
))
5379 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5380 char __user
*optval
, int __user
*optlen
)
5382 struct net
*net
= sock_net(sk
);
5383 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5384 struct sctp_authchunks val
;
5385 struct sctp_association
*asoc
;
5386 struct sctp_chunks_param
*ch
;
5390 if (!net
->sctp
.auth_enable
)
5393 if (len
< sizeof(struct sctp_authchunks
))
5396 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
5399 to
= p
->gauth_chunks
;
5400 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5404 ch
= asoc
->peer
.peer_chunks
;
5408 /* See if the user provided enough room for all the data */
5409 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5410 if (len
< num_chunks
)
5413 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
5416 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
5417 if (put_user(len
, optlen
)) return -EFAULT
;
5418 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5423 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
5424 char __user
*optval
, int __user
*optlen
)
5426 struct net
*net
= sock_net(sk
);
5427 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5428 struct sctp_authchunks val
;
5429 struct sctp_association
*asoc
;
5430 struct sctp_chunks_param
*ch
;
5434 if (!net
->sctp
.auth_enable
)
5437 if (len
< sizeof(struct sctp_authchunks
))
5440 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
5443 to
= p
->gauth_chunks
;
5444 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5445 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
5449 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
5451 ch
= sctp_sk(sk
)->ep
->auth_chunk_list
;
5456 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5457 if (len
< sizeof(struct sctp_authchunks
) + num_chunks
)
5460 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
5463 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
5464 if (put_user(len
, optlen
))
5466 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5473 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5474 * This option gets the current number of associations that are attached
5475 * to a one-to-many style socket. The option value is an uint32_t.
5477 static int sctp_getsockopt_assoc_number(struct sock
*sk
, int len
,
5478 char __user
*optval
, int __user
*optlen
)
5480 struct sctp_sock
*sp
= sctp_sk(sk
);
5481 struct sctp_association
*asoc
;
5484 if (sctp_style(sk
, TCP
))
5487 if (len
< sizeof(u32
))
5492 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5496 if (put_user(len
, optlen
))
5498 if (copy_to_user(optval
, &val
, len
))
5505 * 8.1.23 SCTP_AUTO_ASCONF
5506 * See the corresponding setsockopt entry as description
5508 static int sctp_getsockopt_auto_asconf(struct sock
*sk
, int len
,
5509 char __user
*optval
, int __user
*optlen
)
5513 if (len
< sizeof(int))
5517 if (sctp_sk(sk
)->do_auto_asconf
&& sctp_is_ep_boundall(sk
))
5519 if (put_user(len
, optlen
))
5521 if (copy_to_user(optval
, &val
, len
))
5527 * 8.2.6. Get the Current Identifiers of Associations
5528 * (SCTP_GET_ASSOC_ID_LIST)
5530 * This option gets the current list of SCTP association identifiers of
5531 * the SCTP associations handled by a one-to-many style socket.
5533 static int sctp_getsockopt_assoc_ids(struct sock
*sk
, int len
,
5534 char __user
*optval
, int __user
*optlen
)
5536 struct sctp_sock
*sp
= sctp_sk(sk
);
5537 struct sctp_association
*asoc
;
5538 struct sctp_assoc_ids
*ids
;
5541 if (sctp_style(sk
, TCP
))
5544 if (len
< sizeof(struct sctp_assoc_ids
))
5547 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5551 if (len
< sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
)
5554 len
= sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
;
5556 ids
= kmalloc(len
, GFP_KERNEL
);
5560 ids
->gaids_number_of_ids
= num
;
5562 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5563 ids
->gaids_assoc_id
[num
++] = asoc
->assoc_id
;
5566 if (put_user(len
, optlen
) || copy_to_user(optval
, ids
, len
)) {
5576 * SCTP_PEER_ADDR_THLDS
5578 * This option allows us to fetch the partially failed threshold for one or all
5579 * transports in an association. See Section 6.1 of:
5580 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5582 static int sctp_getsockopt_paddr_thresholds(struct sock
*sk
,
5583 char __user
*optval
,
5587 struct sctp_paddrthlds val
;
5588 struct sctp_transport
*trans
;
5589 struct sctp_association
*asoc
;
5591 if (len
< sizeof(struct sctp_paddrthlds
))
5593 len
= sizeof(struct sctp_paddrthlds
);
5594 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
, len
))
5597 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
5598 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
5602 val
.spt_pathpfthld
= asoc
->pf_retrans
;
5603 val
.spt_pathmaxrxt
= asoc
->pathmaxrxt
;
5605 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
5610 val
.spt_pathmaxrxt
= trans
->pathmaxrxt
;
5611 val
.spt_pathpfthld
= trans
->pf_retrans
;
5614 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
5620 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
5621 char __user
*optval
, int __user
*optlen
)
5626 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5629 /* I can hardly begin to describe how wrong this is. This is
5630 * so broken as to be worse than useless. The API draft
5631 * REALLY is NOT helpful here... I am not convinced that the
5632 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5633 * are at all well-founded.
5635 if (level
!= SOL_SCTP
) {
5636 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5638 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
5642 if (get_user(len
, optlen
))
5649 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
5651 case SCTP_DISABLE_FRAGMENTS
:
5652 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
5656 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
5658 case SCTP_AUTOCLOSE
:
5659 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
5661 case SCTP_SOCKOPT_PEELOFF
:
5662 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
5664 case SCTP_PEER_ADDR_PARAMS
:
5665 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
5668 case SCTP_DELAYED_SACK
:
5669 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
5673 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
5675 case SCTP_GET_PEER_ADDRS
:
5676 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
5679 case SCTP_GET_LOCAL_ADDRS
:
5680 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
5683 case SCTP_SOCKOPT_CONNECTX3
:
5684 retval
= sctp_getsockopt_connectx3(sk
, len
, optval
, optlen
);
5686 case SCTP_DEFAULT_SEND_PARAM
:
5687 retval
= sctp_getsockopt_default_send_param(sk
, len
,
5690 case SCTP_PRIMARY_ADDR
:
5691 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
5694 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
5697 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
5699 case SCTP_ASSOCINFO
:
5700 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
5702 case SCTP_I_WANT_MAPPED_V4_ADDR
:
5703 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
5706 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
5708 case SCTP_GET_PEER_ADDR_INFO
:
5709 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
5712 case SCTP_ADAPTATION_LAYER
:
5713 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
5717 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
5719 case SCTP_FRAGMENT_INTERLEAVE
:
5720 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
5723 case SCTP_PARTIAL_DELIVERY_POINT
:
5724 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
5727 case SCTP_MAX_BURST
:
5728 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
5731 case SCTP_AUTH_CHUNK
:
5732 case SCTP_AUTH_DELETE_KEY
:
5733 retval
= -EOPNOTSUPP
;
5735 case SCTP_HMAC_IDENT
:
5736 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
5738 case SCTP_AUTH_ACTIVE_KEY
:
5739 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
5741 case SCTP_PEER_AUTH_CHUNKS
:
5742 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
5745 case SCTP_LOCAL_AUTH_CHUNKS
:
5746 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
5749 case SCTP_GET_ASSOC_NUMBER
:
5750 retval
= sctp_getsockopt_assoc_number(sk
, len
, optval
, optlen
);
5752 case SCTP_GET_ASSOC_ID_LIST
:
5753 retval
= sctp_getsockopt_assoc_ids(sk
, len
, optval
, optlen
);
5755 case SCTP_AUTO_ASCONF
:
5756 retval
= sctp_getsockopt_auto_asconf(sk
, len
, optval
, optlen
);
5758 case SCTP_PEER_ADDR_THLDS
:
5759 retval
= sctp_getsockopt_paddr_thresholds(sk
, optval
, len
, optlen
);
5762 retval
= -ENOPROTOOPT
;
5766 sctp_release_sock(sk
);
5770 static void sctp_hash(struct sock
*sk
)
5775 static void sctp_unhash(struct sock
*sk
)
5780 /* Check if port is acceptable. Possibly find first available port.
5782 * The port hash table (contained in the 'global' SCTP protocol storage
5783 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5784 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5785 * list (the list number is the port number hashed out, so as you
5786 * would expect from a hash function, all the ports in a given list have
5787 * such a number that hashes out to the same list number; you were
5788 * expecting that, right?); so each list has a set of ports, with a
5789 * link to the socket (struct sock) that uses it, the port number and
5790 * a fastreuse flag (FIXME: NPI ipg).
5792 static struct sctp_bind_bucket
*sctp_bucket_create(
5793 struct sctp_bind_hashbucket
*head
, struct net
*, unsigned short snum
);
5795 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
5797 struct sctp_bind_hashbucket
*head
; /* hash list */
5798 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5799 struct hlist_node
*node
;
5800 unsigned short snum
;
5803 snum
= ntohs(addr
->v4
.sin_port
);
5805 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
5806 sctp_local_bh_disable();
5809 /* Search for an available port. */
5810 int low
, high
, remaining
, index
;
5813 inet_get_local_port_range(&low
, &high
);
5814 remaining
= (high
- low
) + 1;
5815 rover
= net_random() % remaining
+ low
;
5819 if ((rover
< low
) || (rover
> high
))
5821 if (inet_is_reserved_local_port(rover
))
5823 index
= sctp_phashfn(sock_net(sk
), rover
);
5824 head
= &sctp_port_hashtable
[index
];
5825 sctp_spin_lock(&head
->lock
);
5826 sctp_for_each_hentry(pp
, node
, &head
->chain
)
5827 if ((pp
->port
== rover
) &&
5828 net_eq(sock_net(sk
), pp
->net
))
5832 sctp_spin_unlock(&head
->lock
);
5833 } while (--remaining
> 0);
5835 /* Exhausted local port range during search? */
5840 /* OK, here is the one we will use. HEAD (the port
5841 * hash table list entry) is non-NULL and we hold it's
5846 /* We are given an specific port number; we verify
5847 * that it is not being used. If it is used, we will
5848 * exahust the search in the hash list corresponding
5849 * to the port number (snum) - we detect that with the
5850 * port iterator, pp being NULL.
5852 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
), snum
)];
5853 sctp_spin_lock(&head
->lock
);
5854 sctp_for_each_hentry(pp
, node
, &head
->chain
) {
5855 if ((pp
->port
== snum
) && net_eq(pp
->net
, sock_net(sk
)))
5862 if (!hlist_empty(&pp
->owner
)) {
5863 /* We had a port hash table hit - there is an
5864 * available port (pp != NULL) and it is being
5865 * used by other socket (pp->owner not empty); that other
5866 * socket is going to be sk2.
5868 int reuse
= sk
->sk_reuse
;
5871 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5872 if (pp
->fastreuse
&& sk
->sk_reuse
&&
5873 sk
->sk_state
!= SCTP_SS_LISTENING
)
5876 /* Run through the list of sockets bound to the port
5877 * (pp->port) [via the pointers bind_next and
5878 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5879 * we get the endpoint they describe and run through
5880 * the endpoint's list of IP (v4 or v6) addresses,
5881 * comparing each of the addresses with the address of
5882 * the socket sk. If we find a match, then that means
5883 * that this port/socket (sk) combination are already
5886 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
5887 struct sctp_endpoint
*ep2
;
5888 ep2
= sctp_sk(sk2
)->ep
;
5891 (reuse
&& sk2
->sk_reuse
&&
5892 sk2
->sk_state
!= SCTP_SS_LISTENING
))
5895 if (sctp_bind_addr_conflict(&ep2
->base
.bind_addr
, addr
,
5896 sctp_sk(sk2
), sctp_sk(sk
))) {
5901 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5904 /* If there was a hash table miss, create a new port. */
5906 if (!pp
&& !(pp
= sctp_bucket_create(head
, sock_net(sk
), snum
)))
5909 /* In either case (hit or miss), make sure fastreuse is 1 only
5910 * if sk->sk_reuse is too (that is, if the caller requested
5911 * SO_REUSEADDR on this socket -sk-).
5913 if (hlist_empty(&pp
->owner
)) {
5914 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
5918 } else if (pp
->fastreuse
&&
5919 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
5922 /* We are set, so fill up all the data in the hash table
5923 * entry, tie the socket list information with the rest of the
5924 * sockets FIXME: Blurry, NPI (ipg).
5927 if (!sctp_sk(sk
)->bind_hash
) {
5928 inet_sk(sk
)->inet_num
= snum
;
5929 sk_add_bind_node(sk
, &pp
->owner
);
5930 sctp_sk(sk
)->bind_hash
= pp
;
5935 sctp_spin_unlock(&head
->lock
);
5938 sctp_local_bh_enable();
5942 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5943 * port is requested.
5945 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
5948 union sctp_addr addr
;
5949 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5951 /* Set up a dummy address struct from the sk. */
5952 af
->from_sk(&addr
, sk
);
5953 addr
.v4
.sin_port
= htons(snum
);
5955 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5956 ret
= sctp_get_port_local(sk
, &addr
);
5962 * Move a socket to LISTENING state.
5964 SCTP_STATIC
int sctp_listen_start(struct sock
*sk
, int backlog
)
5966 struct sctp_sock
*sp
= sctp_sk(sk
);
5967 struct sctp_endpoint
*ep
= sp
->ep
;
5968 struct crypto_hash
*tfm
= NULL
;
5970 /* Allocate HMAC for generating cookie. */
5971 if (!sctp_sk(sk
)->hmac
&& sctp_hmac_alg
) {
5972 tfm
= crypto_alloc_hash(sctp_hmac_alg
, 0, CRYPTO_ALG_ASYNC
);
5974 net_info_ratelimited("failed to load transform for %s: %ld\n",
5975 sctp_hmac_alg
, PTR_ERR(tfm
));
5978 sctp_sk(sk
)->hmac
= tfm
;
5982 * If a bind() or sctp_bindx() is not called prior to a listen()
5983 * call that allows new associations to be accepted, the system
5984 * picks an ephemeral port and will choose an address set equivalent
5985 * to binding with a wildcard address.
5987 * This is not currently spelled out in the SCTP sockets
5988 * extensions draft, but follows the practice as seen in TCP
5992 sk
->sk_state
= SCTP_SS_LISTENING
;
5993 if (!ep
->base
.bind_addr
.port
) {
5994 if (sctp_autobind(sk
))
5997 if (sctp_get_port(sk
, inet_sk(sk
)->inet_num
)) {
5998 sk
->sk_state
= SCTP_SS_CLOSED
;
6003 sk
->sk_max_ack_backlog
= backlog
;
6004 sctp_hash_endpoint(ep
);
6009 * 4.1.3 / 5.1.3 listen()
6011 * By default, new associations are not accepted for UDP style sockets.
6012 * An application uses listen() to mark a socket as being able to
6013 * accept new associations.
6015 * On TCP style sockets, applications use listen() to ready the SCTP
6016 * endpoint for accepting inbound associations.
6018 * On both types of endpoints a backlog of '0' disables listening.
6020 * Move a socket to LISTENING state.
6022 int sctp_inet_listen(struct socket
*sock
, int backlog
)
6024 struct sock
*sk
= sock
->sk
;
6025 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6028 if (unlikely(backlog
< 0))
6033 /* Peeled-off sockets are not allowed to listen(). */
6034 if (sctp_style(sk
, UDP_HIGH_BANDWIDTH
))
6037 if (sock
->state
!= SS_UNCONNECTED
)
6040 /* If backlog is zero, disable listening. */
6042 if (sctp_sstate(sk
, CLOSED
))
6046 sctp_unhash_endpoint(ep
);
6047 sk
->sk_state
= SCTP_SS_CLOSED
;
6049 sctp_sk(sk
)->bind_hash
->fastreuse
= 1;
6053 /* If we are already listening, just update the backlog */
6054 if (sctp_sstate(sk
, LISTENING
))
6055 sk
->sk_max_ack_backlog
= backlog
;
6057 err
= sctp_listen_start(sk
, backlog
);
6064 sctp_release_sock(sk
);
6069 * This function is done by modeling the current datagram_poll() and the
6070 * tcp_poll(). Note that, based on these implementations, we don't
6071 * lock the socket in this function, even though it seems that,
6072 * ideally, locking or some other mechanisms can be used to ensure
6073 * the integrity of the counters (sndbuf and wmem_alloc) used
6074 * in this place. We assume that we don't need locks either until proven
6077 * Another thing to note is that we include the Async I/O support
6078 * here, again, by modeling the current TCP/UDP code. We don't have
6079 * a good way to test with it yet.
6081 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
6083 struct sock
*sk
= sock
->sk
;
6084 struct sctp_sock
*sp
= sctp_sk(sk
);
6087 poll_wait(file
, sk_sleep(sk
), wait
);
6089 /* A TCP-style listening socket becomes readable when the accept queue
6092 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
6093 return (!list_empty(&sp
->ep
->asocs
)) ?
6094 (POLLIN
| POLLRDNORM
) : 0;
6098 /* Is there any exceptional events? */
6099 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
6101 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6102 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
6103 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
6106 /* Is it readable? Reconsider this code with TCP-style support. */
6107 if (!skb_queue_empty(&sk
->sk_receive_queue
))
6108 mask
|= POLLIN
| POLLRDNORM
;
6110 /* The association is either gone or not ready. */
6111 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
6114 /* Is it writable? */
6115 if (sctp_writeable(sk
)) {
6116 mask
|= POLLOUT
| POLLWRNORM
;
6118 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
6120 * Since the socket is not locked, the buffer
6121 * might be made available after the writeable check and
6122 * before the bit is set. This could cause a lost I/O
6123 * signal. tcp_poll() has a race breaker for this race
6124 * condition. Based on their implementation, we put
6125 * in the following code to cover it as well.
6127 if (sctp_writeable(sk
))
6128 mask
|= POLLOUT
| POLLWRNORM
;
6133 /********************************************************************
6134 * 2nd Level Abstractions
6135 ********************************************************************/
6137 static struct sctp_bind_bucket
*sctp_bucket_create(
6138 struct sctp_bind_hashbucket
*head
, struct net
*net
, unsigned short snum
)
6140 struct sctp_bind_bucket
*pp
;
6142 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
6144 SCTP_DBG_OBJCNT_INC(bind_bucket
);
6147 INIT_HLIST_HEAD(&pp
->owner
);
6149 hlist_add_head(&pp
->node
, &head
->chain
);
6154 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6155 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
6157 if (pp
&& hlist_empty(&pp
->owner
)) {
6158 __hlist_del(&pp
->node
);
6159 kmem_cache_free(sctp_bucket_cachep
, pp
);
6160 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
6164 /* Release this socket's reference to a local port. */
6165 static inline void __sctp_put_port(struct sock
*sk
)
6167 struct sctp_bind_hashbucket
*head
=
6168 &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
),
6169 inet_sk(sk
)->inet_num
)];
6170 struct sctp_bind_bucket
*pp
;
6172 sctp_spin_lock(&head
->lock
);
6173 pp
= sctp_sk(sk
)->bind_hash
;
6174 __sk_del_bind_node(sk
);
6175 sctp_sk(sk
)->bind_hash
= NULL
;
6176 inet_sk(sk
)->inet_num
= 0;
6177 sctp_bucket_destroy(pp
);
6178 sctp_spin_unlock(&head
->lock
);
6181 void sctp_put_port(struct sock
*sk
)
6183 sctp_local_bh_disable();
6184 __sctp_put_port(sk
);
6185 sctp_local_bh_enable();
6189 * The system picks an ephemeral port and choose an address set equivalent
6190 * to binding with a wildcard address.
6191 * One of those addresses will be the primary address for the association.
6192 * This automatically enables the multihoming capability of SCTP.
6194 static int sctp_autobind(struct sock
*sk
)
6196 union sctp_addr autoaddr
;
6200 /* Initialize a local sockaddr structure to INADDR_ANY. */
6201 af
= sctp_sk(sk
)->pf
->af
;
6203 port
= htons(inet_sk(sk
)->inet_num
);
6204 af
->inaddr_any(&autoaddr
, port
);
6206 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
6209 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6212 * 4.2 The cmsghdr Structure *
6214 * When ancillary data is sent or received, any number of ancillary data
6215 * objects can be specified by the msg_control and msg_controllen members of
6216 * the msghdr structure, because each object is preceded by
6217 * a cmsghdr structure defining the object's length (the cmsg_len member).
6218 * Historically Berkeley-derived implementations have passed only one object
6219 * at a time, but this API allows multiple objects to be
6220 * passed in a single call to sendmsg() or recvmsg(). The following example
6221 * shows two ancillary data objects in a control buffer.
6223 * |<--------------------------- msg_controllen -------------------------->|
6226 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6228 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6231 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6233 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6236 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6237 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6239 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6241 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6248 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
6249 sctp_cmsgs_t
*cmsgs
)
6251 struct cmsghdr
*cmsg
;
6252 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
6254 for (cmsg
= CMSG_FIRSTHDR(msg
);
6256 cmsg
= CMSG_NXTHDR(my_msg
, cmsg
)) {
6257 if (!CMSG_OK(my_msg
, cmsg
))
6260 /* Should we parse this header or ignore? */
6261 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
6264 /* Strictly check lengths following example in SCM code. */
6265 switch (cmsg
->cmsg_type
) {
6267 /* SCTP Socket API Extension
6268 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
6270 * This cmsghdr structure provides information for
6271 * initializing new SCTP associations with sendmsg().
6272 * The SCTP_INITMSG socket option uses this same data
6273 * structure. This structure is not used for
6276 * cmsg_level cmsg_type cmsg_data[]
6277 * ------------ ------------ ----------------------
6278 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6280 if (cmsg
->cmsg_len
!=
6281 CMSG_LEN(sizeof(struct sctp_initmsg
)))
6283 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
6287 /* SCTP Socket API Extension
6288 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6290 * This cmsghdr structure specifies SCTP options for
6291 * sendmsg() and describes SCTP header information
6292 * about a received message through recvmsg().
6294 * cmsg_level cmsg_type cmsg_data[]
6295 * ------------ ------------ ----------------------
6296 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6298 if (cmsg
->cmsg_len
!=
6299 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
6303 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
6305 /* Minimally, validate the sinfo_flags. */
6306 if (cmsgs
->info
->sinfo_flags
&
6307 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
6308 SCTP_ABORT
| SCTP_EOF
))
6320 * Wait for a packet..
6321 * Note: This function is the same function as in core/datagram.c
6322 * with a few modifications to make lksctp work.
6324 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
6329 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
6331 /* Socket errors? */
6332 error
= sock_error(sk
);
6336 if (!skb_queue_empty(&sk
->sk_receive_queue
))
6339 /* Socket shut down? */
6340 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6343 /* Sequenced packets can come disconnected. If so we report the
6348 /* Is there a good reason to think that we may receive some data? */
6349 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
6352 /* Handle signals. */
6353 if (signal_pending(current
))
6356 /* Let another process have a go. Since we are going to sleep
6357 * anyway. Note: This may cause odd behaviors if the message
6358 * does not fit in the user's buffer, but this seems to be the
6359 * only way to honor MSG_DONTWAIT realistically.
6361 sctp_release_sock(sk
);
6362 *timeo_p
= schedule_timeout(*timeo_p
);
6366 finish_wait(sk_sleep(sk
), &wait
);
6370 error
= sock_intr_errno(*timeo_p
);
6373 finish_wait(sk_sleep(sk
), &wait
);
6378 /* Receive a datagram.
6379 * Note: This is pretty much the same routine as in core/datagram.c
6380 * with a few changes to make lksctp work.
6382 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
6383 int noblock
, int *err
)
6386 struct sk_buff
*skb
;
6389 timeo
= sock_rcvtimeo(sk
, noblock
);
6391 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6392 timeo
, MAX_SCHEDULE_TIMEOUT
);
6395 /* Again only user level code calls this function,
6396 * so nothing interrupt level
6397 * will suddenly eat the receive_queue.
6399 * Look at current nfs client by the way...
6400 * However, this function was correct in any case. 8)
6402 if (flags
& MSG_PEEK
) {
6403 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
6404 skb
= skb_peek(&sk
->sk_receive_queue
);
6406 atomic_inc(&skb
->users
);
6407 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
6409 skb
= skb_dequeue(&sk
->sk_receive_queue
);
6415 /* Caller is allowed not to check sk->sk_err before calling. */
6416 error
= sock_error(sk
);
6420 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6423 /* User doesn't want to wait. */
6427 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
6436 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6437 static void __sctp_write_space(struct sctp_association
*asoc
)
6439 struct sock
*sk
= asoc
->base
.sk
;
6440 struct socket
*sock
= sk
->sk_socket
;
6442 if ((sctp_wspace(asoc
) > 0) && sock
) {
6443 if (waitqueue_active(&asoc
->wait
))
6444 wake_up_interruptible(&asoc
->wait
);
6446 if (sctp_writeable(sk
)) {
6447 wait_queue_head_t
*wq
= sk_sleep(sk
);
6449 if (wq
&& waitqueue_active(wq
))
6450 wake_up_interruptible(wq
);
6452 /* Note that we try to include the Async I/O support
6453 * here by modeling from the current TCP/UDP code.
6454 * We have not tested with it yet.
6456 if (!(sk
->sk_shutdown
& SEND_SHUTDOWN
))
6457 sock_wake_async(sock
,
6458 SOCK_WAKE_SPACE
, POLL_OUT
);
6463 /* Do accounting for the sndbuf space.
6464 * Decrement the used sndbuf space of the corresponding association by the
6465 * data size which was just transmitted(freed).
6467 static void sctp_wfree(struct sk_buff
*skb
)
6469 struct sctp_association
*asoc
;
6470 struct sctp_chunk
*chunk
;
6473 /* Get the saved chunk pointer. */
6474 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
6477 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
6478 sizeof(struct sk_buff
) +
6479 sizeof(struct sctp_chunk
);
6481 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
6484 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6486 sk
->sk_wmem_queued
-= skb
->truesize
;
6487 sk_mem_uncharge(sk
, skb
->truesize
);
6490 __sctp_write_space(asoc
);
6492 sctp_association_put(asoc
);
6495 /* Do accounting for the receive space on the socket.
6496 * Accounting for the association is done in ulpevent.c
6497 * We set this as a destructor for the cloned data skbs so that
6498 * accounting is done at the correct time.
6500 void sctp_sock_rfree(struct sk_buff
*skb
)
6502 struct sock
*sk
= skb
->sk
;
6503 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
6505 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
6508 * Mimic the behavior of sock_rfree
6510 sk_mem_uncharge(sk
, event
->rmem_len
);
6514 /* Helper function to wait for space in the sndbuf. */
6515 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
6518 struct sock
*sk
= asoc
->base
.sk
;
6520 long current_timeo
= *timeo_p
;
6523 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6524 asoc
, (long)(*timeo_p
), msg_len
);
6526 /* Increment the association's refcnt. */
6527 sctp_association_hold(asoc
);
6529 /* Wait on the association specific sndbuf space. */
6531 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6532 TASK_INTERRUPTIBLE
);
6535 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6538 if (signal_pending(current
))
6539 goto do_interrupted
;
6540 if (msg_len
<= sctp_wspace(asoc
))
6543 /* Let another process have a go. Since we are going
6546 sctp_release_sock(sk
);
6547 current_timeo
= schedule_timeout(current_timeo
);
6548 BUG_ON(sk
!= asoc
->base
.sk
);
6551 *timeo_p
= current_timeo
;
6555 finish_wait(&asoc
->wait
, &wait
);
6557 /* Release the association's refcnt. */
6558 sctp_association_put(asoc
);
6567 err
= sock_intr_errno(*timeo_p
);
6575 void sctp_data_ready(struct sock
*sk
, int len
)
6577 struct socket_wq
*wq
;
6580 wq
= rcu_dereference(sk
->sk_wq
);
6581 if (wq_has_sleeper(wq
))
6582 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
6583 POLLRDNORM
| POLLRDBAND
);
6584 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
6588 /* If socket sndbuf has changed, wake up all per association waiters. */
6589 void sctp_write_space(struct sock
*sk
)
6591 struct sctp_association
*asoc
;
6593 /* Wake up the tasks in each wait queue. */
6594 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
6595 __sctp_write_space(asoc
);
6599 /* Is there any sndbuf space available on the socket?
6601 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6602 * associations on the same socket. For a UDP-style socket with
6603 * multiple associations, it is possible for it to be "unwriteable"
6604 * prematurely. I assume that this is acceptable because
6605 * a premature "unwriteable" is better than an accidental "writeable" which
6606 * would cause an unwanted block under certain circumstances. For the 1-1
6607 * UDP-style sockets or TCP-style sockets, this code should work.
6610 static int sctp_writeable(struct sock
*sk
)
6614 amt
= sk
->sk_sndbuf
- sk_wmem_alloc_get(sk
);
6620 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6621 * returns immediately with EINPROGRESS.
6623 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
6625 struct sock
*sk
= asoc
->base
.sk
;
6627 long current_timeo
= *timeo_p
;
6630 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__
, asoc
,
6633 /* Increment the association's refcnt. */
6634 sctp_association_hold(asoc
);
6637 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6638 TASK_INTERRUPTIBLE
);
6641 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6643 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6646 if (signal_pending(current
))
6647 goto do_interrupted
;
6649 if (sctp_state(asoc
, ESTABLISHED
))
6652 /* Let another process have a go. Since we are going
6655 sctp_release_sock(sk
);
6656 current_timeo
= schedule_timeout(current_timeo
);
6659 *timeo_p
= current_timeo
;
6663 finish_wait(&asoc
->wait
, &wait
);
6665 /* Release the association's refcnt. */
6666 sctp_association_put(asoc
);
6671 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
6674 err
= -ECONNREFUSED
;
6678 err
= sock_intr_errno(*timeo_p
);
6686 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
6688 struct sctp_endpoint
*ep
;
6692 ep
= sctp_sk(sk
)->ep
;
6696 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
6697 TASK_INTERRUPTIBLE
);
6699 if (list_empty(&ep
->asocs
)) {
6700 sctp_release_sock(sk
);
6701 timeo
= schedule_timeout(timeo
);
6706 if (!sctp_sstate(sk
, LISTENING
))
6710 if (!list_empty(&ep
->asocs
))
6713 err
= sock_intr_errno(timeo
);
6714 if (signal_pending(current
))
6722 finish_wait(sk_sleep(sk
), &wait
);
6727 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
6732 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
6733 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
6735 sctp_release_sock(sk
);
6736 timeout
= schedule_timeout(timeout
);
6738 } while (!signal_pending(current
) && timeout
);
6740 finish_wait(sk_sleep(sk
), &wait
);
6743 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
6745 struct sk_buff
*frag
;
6750 /* Don't forget the fragments. */
6751 skb_walk_frags(skb
, frag
)
6752 sctp_skb_set_owner_r_frag(frag
, sk
);
6755 sctp_skb_set_owner_r(skb
, sk
);
6758 void sctp_copy_sock(struct sock
*newsk
, struct sock
*sk
,
6759 struct sctp_association
*asoc
)
6761 struct inet_sock
*inet
= inet_sk(sk
);
6762 struct inet_sock
*newinet
;
6764 newsk
->sk_type
= sk
->sk_type
;
6765 newsk
->sk_bound_dev_if
= sk
->sk_bound_dev_if
;
6766 newsk
->sk_flags
= sk
->sk_flags
;
6767 newsk
->sk_no_check
= sk
->sk_no_check
;
6768 newsk
->sk_reuse
= sk
->sk_reuse
;
6770 newsk
->sk_shutdown
= sk
->sk_shutdown
;
6771 newsk
->sk_destruct
= inet_sock_destruct
;
6772 newsk
->sk_family
= sk
->sk_family
;
6773 newsk
->sk_protocol
= IPPROTO_SCTP
;
6774 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
6775 newsk
->sk_sndbuf
= sk
->sk_sndbuf
;
6776 newsk
->sk_rcvbuf
= sk
->sk_rcvbuf
;
6777 newsk
->sk_lingertime
= sk
->sk_lingertime
;
6778 newsk
->sk_rcvtimeo
= sk
->sk_rcvtimeo
;
6779 newsk
->sk_sndtimeo
= sk
->sk_sndtimeo
;
6781 newinet
= inet_sk(newsk
);
6783 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6784 * getsockname() and getpeername()
6786 newinet
->inet_sport
= inet
->inet_sport
;
6787 newinet
->inet_saddr
= inet
->inet_saddr
;
6788 newinet
->inet_rcv_saddr
= inet
->inet_rcv_saddr
;
6789 newinet
->inet_dport
= htons(asoc
->peer
.port
);
6790 newinet
->pmtudisc
= inet
->pmtudisc
;
6791 newinet
->inet_id
= asoc
->next_tsn
^ jiffies
;
6793 newinet
->uc_ttl
= inet
->uc_ttl
;
6794 newinet
->mc_loop
= 1;
6795 newinet
->mc_ttl
= 1;
6796 newinet
->mc_index
= 0;
6797 newinet
->mc_list
= NULL
;
6800 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6801 * and its messages to the newsk.
6803 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
6804 struct sctp_association
*assoc
,
6805 sctp_socket_type_t type
)
6807 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
6808 struct sctp_sock
*newsp
= sctp_sk(newsk
);
6809 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
6810 struct sctp_endpoint
*newep
= newsp
->ep
;
6811 struct sk_buff
*skb
, *tmp
;
6812 struct sctp_ulpevent
*event
;
6813 struct sctp_bind_hashbucket
*head
;
6814 struct list_head tmplist
;
6816 /* Migrate socket buffer sizes and all the socket level options to the
6819 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
6820 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
6821 /* Brute force copy old sctp opt. */
6822 if (oldsp
->do_auto_asconf
) {
6823 memcpy(&tmplist
, &newsp
->auto_asconf_list
, sizeof(tmplist
));
6824 inet_sk_copy_descendant(newsk
, oldsk
);
6825 memcpy(&newsp
->auto_asconf_list
, &tmplist
, sizeof(tmplist
));
6827 inet_sk_copy_descendant(newsk
, oldsk
);
6829 /* Restore the ep value that was overwritten with the above structure
6835 /* Hook this new socket in to the bind_hash list. */
6836 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(oldsk
),
6837 inet_sk(oldsk
)->inet_num
)];
6838 sctp_local_bh_disable();
6839 sctp_spin_lock(&head
->lock
);
6840 pp
= sctp_sk(oldsk
)->bind_hash
;
6841 sk_add_bind_node(newsk
, &pp
->owner
);
6842 sctp_sk(newsk
)->bind_hash
= pp
;
6843 inet_sk(newsk
)->inet_num
= inet_sk(oldsk
)->inet_num
;
6844 sctp_spin_unlock(&head
->lock
);
6845 sctp_local_bh_enable();
6847 /* Copy the bind_addr list from the original endpoint to the new
6848 * endpoint so that we can handle restarts properly
6850 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
6851 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
6853 /* Move any messages in the old socket's receive queue that are for the
6854 * peeled off association to the new socket's receive queue.
6856 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
6857 event
= sctp_skb2event(skb
);
6858 if (event
->asoc
== assoc
) {
6859 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
6860 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
6861 sctp_skb_set_owner_r_frag(skb
, newsk
);
6865 /* Clean up any messages pending delivery due to partial
6866 * delivery. Three cases:
6867 * 1) No partial deliver; no work.
6868 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6869 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6871 skb_queue_head_init(&newsp
->pd_lobby
);
6872 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
6874 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
6875 struct sk_buff_head
*queue
;
6877 /* Decide which queue to move pd_lobby skbs to. */
6878 if (assoc
->ulpq
.pd_mode
) {
6879 queue
= &newsp
->pd_lobby
;
6881 queue
= &newsk
->sk_receive_queue
;
6883 /* Walk through the pd_lobby, looking for skbs that
6884 * need moved to the new socket.
6886 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6887 event
= sctp_skb2event(skb
);
6888 if (event
->asoc
== assoc
) {
6889 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6890 __skb_queue_tail(queue
, skb
);
6891 sctp_skb_set_owner_r_frag(skb
, newsk
);
6895 /* Clear up any skbs waiting for the partial
6896 * delivery to finish.
6898 if (assoc
->ulpq
.pd_mode
)
6899 sctp_clear_pd(oldsk
, NULL
);
6903 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
)
6904 sctp_skb_set_owner_r_frag(skb
, newsk
);
6906 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
)
6907 sctp_skb_set_owner_r_frag(skb
, newsk
);
6909 /* Set the type of socket to indicate that it is peeled off from the
6910 * original UDP-style socket or created with the accept() call on a
6911 * TCP-style socket..
6915 /* Mark the new socket "in-use" by the user so that any packets
6916 * that may arrive on the association after we've moved it are
6917 * queued to the backlog. This prevents a potential race between
6918 * backlog processing on the old socket and new-packet processing
6919 * on the new socket.
6921 * The caller has just allocated newsk so we can guarantee that other
6922 * paths won't try to lock it and then oldsk.
6924 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
6925 sctp_assoc_migrate(assoc
, newsk
);
6927 /* If the association on the newsk is already closed before accept()
6928 * is called, set RCV_SHUTDOWN flag.
6930 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
6931 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
6933 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
6934 sctp_release_sock(newsk
);
6938 /* This proto struct describes the ULP interface for SCTP. */
6939 struct proto sctp_prot
= {
6941 .owner
= THIS_MODULE
,
6942 .close
= sctp_close
,
6943 .connect
= sctp_connect
,
6944 .disconnect
= sctp_disconnect
,
6945 .accept
= sctp_accept
,
6946 .ioctl
= sctp_ioctl
,
6947 .init
= sctp_init_sock
,
6948 .destroy
= sctp_destroy_sock
,
6949 .shutdown
= sctp_shutdown
,
6950 .setsockopt
= sctp_setsockopt
,
6951 .getsockopt
= sctp_getsockopt
,
6952 .sendmsg
= sctp_sendmsg
,
6953 .recvmsg
= sctp_recvmsg
,
6955 .backlog_rcv
= sctp_backlog_rcv
,
6957 .unhash
= sctp_unhash
,
6958 .get_port
= sctp_get_port
,
6959 .obj_size
= sizeof(struct sctp_sock
),
6960 .sysctl_mem
= sysctl_sctp_mem
,
6961 .sysctl_rmem
= sysctl_sctp_rmem
,
6962 .sysctl_wmem
= sysctl_sctp_wmem
,
6963 .memory_pressure
= &sctp_memory_pressure
,
6964 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6965 .memory_allocated
= &sctp_memory_allocated
,
6966 .sockets_allocated
= &sctp_sockets_allocated
,
6969 #if IS_ENABLED(CONFIG_IPV6)
6971 struct proto sctpv6_prot
= {
6973 .owner
= THIS_MODULE
,
6974 .close
= sctp_close
,
6975 .connect
= sctp_connect
,
6976 .disconnect
= sctp_disconnect
,
6977 .accept
= sctp_accept
,
6978 .ioctl
= sctp_ioctl
,
6979 .init
= sctp_init_sock
,
6980 .destroy
= sctp_destroy_sock
,
6981 .shutdown
= sctp_shutdown
,
6982 .setsockopt
= sctp_setsockopt
,
6983 .getsockopt
= sctp_getsockopt
,
6984 .sendmsg
= sctp_sendmsg
,
6985 .recvmsg
= sctp_recvmsg
,
6987 .backlog_rcv
= sctp_backlog_rcv
,
6989 .unhash
= sctp_unhash
,
6990 .get_port
= sctp_get_port
,
6991 .obj_size
= sizeof(struct sctp6_sock
),
6992 .sysctl_mem
= sysctl_sctp_mem
,
6993 .sysctl_rmem
= sysctl_sctp_rmem
,
6994 .sysctl_wmem
= sysctl_sctp_wmem
,
6995 .memory_pressure
= &sctp_memory_pressure
,
6996 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6997 .memory_allocated
= &sctp_memory_allocated
,
6998 .sockets_allocated
= &sctp_sockets_allocated
,
7000 #endif /* IS_ENABLED(CONFIG_IPV6) */