1 /* SCTP kernel reference 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 reference 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 * The SCTP reference 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 * The SCTP reference 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 #include <linux/types.h>
61 #include <linux/kernel.h>
62 #include <linux/wait.h>
63 #include <linux/time.h>
65 #include <linux/capability.h>
66 #include <linux/fcntl.h>
67 #include <linux/poll.h>
68 #include <linux/init.h>
69 #include <linux/crypto.h>
73 #include <net/route.h>
75 #include <net/inet_common.h>
77 #include <linux/socket.h> /* for sa_family_t */
79 #include <net/sctp/sctp.h>
80 #include <net/sctp/sm.h>
82 /* WARNING: Please do not remove the SCTP_STATIC attribute to
83 * any of the functions below as they are used to export functions
84 * used by a project regression testsuite.
87 /* Forward declarations for internal helper functions. */
88 static int sctp_writeable(struct sock
*sk
);
89 static void sctp_wfree(struct sk_buff
*skb
);
90 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
92 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
);
93 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
94 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
95 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
96 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
97 union sctp_addr
*addr
, int len
);
98 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
99 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
100 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
101 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
102 static int sctp_send_asconf(struct sctp_association
*asoc
,
103 struct sctp_chunk
*chunk
);
104 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
105 static int sctp_autobind(struct sock
*sk
);
106 static void sctp_sock_migrate(struct sock
*, struct sock
*,
107 struct sctp_association
*, sctp_socket_type_t
);
108 static char *sctp_hmac_alg
= SCTP_COOKIE_HMAC_ALG
;
110 /* Get the sndbuf space available at the time on the association. */
111 static inline int sctp_wspace(struct sctp_association
*asoc
)
113 struct sock
*sk
= asoc
->base
.sk
;
116 if (asoc
->ep
->sndbuf_policy
) {
117 /* make sure that no association uses more than sk_sndbuf */
118 amt
= sk
->sk_sndbuf
- asoc
->sndbuf_used
;
120 /* do socket level accounting */
121 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
130 /* Increment the used sndbuf space count of the corresponding association by
131 * the size of the outgoing data chunk.
132 * Also, set the skb destructor for sndbuf accounting later.
134 * Since it is always 1-1 between chunk and skb, and also a new skb is always
135 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
136 * destructor in the data chunk skb for the purpose of the sndbuf space
139 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
141 struct sctp_association
*asoc
= chunk
->asoc
;
142 struct sock
*sk
= asoc
->base
.sk
;
144 /* The sndbuf space is tracked per association. */
145 sctp_association_hold(asoc
);
147 skb_set_owner_w(chunk
->skb
, sk
);
149 chunk
->skb
->destructor
= sctp_wfree
;
150 /* Save the chunk pointer in skb for sctp_wfree to use later. */
151 *((struct sctp_chunk
**)(chunk
->skb
->cb
)) = chunk
;
153 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
154 sizeof(struct sk_buff
) +
155 sizeof(struct sctp_chunk
);
157 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
160 /* Verify that this is a valid address. */
161 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
166 /* Verify basic sockaddr. */
167 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
171 /* Is this a valid SCTP address? */
172 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
175 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
181 /* Look up the association by its id. If this is not a UDP-style
182 * socket, the ID field is always ignored.
184 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
186 struct sctp_association
*asoc
= NULL
;
188 /* If this is not a UDP-style socket, assoc id should be ignored. */
189 if (!sctp_style(sk
, UDP
)) {
190 /* Return NULL if the socket state is not ESTABLISHED. It
191 * could be a TCP-style listening socket or a socket which
192 * hasn't yet called connect() to establish an association.
194 if (!sctp_sstate(sk
, ESTABLISHED
))
197 /* Get the first and the only association from the list. */
198 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
199 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
200 struct sctp_association
, asocs
);
204 /* Otherwise this is a UDP-style socket. */
205 if (!id
|| (id
== (sctp_assoc_t
)-1))
208 spin_lock_bh(&sctp_assocs_id_lock
);
209 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
210 spin_unlock_bh(&sctp_assocs_id_lock
);
212 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
218 /* Look up the transport from an address and an assoc id. If both address and
219 * id are specified, the associations matching the address and the id should be
222 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
223 struct sockaddr_storage
*addr
,
226 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
227 struct sctp_transport
*transport
;
228 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
230 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
237 id_asoc
= sctp_id2assoc(sk
, id
);
238 if (id_asoc
&& (id_asoc
!= addr_asoc
))
241 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
242 (union sctp_addr
*)addr
);
247 /* API 3.1.2 bind() - UDP Style Syntax
248 * The syntax of bind() is,
250 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
252 * sd - the socket descriptor returned by socket().
253 * addr - the address structure (struct sockaddr_in or struct
254 * sockaddr_in6 [RFC 2553]),
255 * addr_len - the size of the address structure.
257 SCTP_STATIC
int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
263 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
266 /* Disallow binding twice. */
267 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
268 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
273 sctp_release_sock(sk
);
278 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
280 /* Verify this is a valid sockaddr. */
281 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
282 union sctp_addr
*addr
, int len
)
286 /* Check minimum size. */
287 if (len
< sizeof (struct sockaddr
))
290 /* Does this PF support this AF? */
291 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
294 /* If we get this far, af is valid. */
295 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
297 if (len
< af
->sockaddr_len
)
303 /* Bind a local address either to an endpoint or to an association. */
304 SCTP_STATIC
int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
306 struct sctp_sock
*sp
= sctp_sk(sk
);
307 struct sctp_endpoint
*ep
= sp
->ep
;
308 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
313 /* Common sockaddr verification. */
314 af
= sctp_sockaddr_af(sp
, addr
, len
);
316 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
321 snum
= ntohs(addr
->v4
.sin_port
);
323 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
324 ", port: %d, new port: %d, len: %d)\n",
330 /* PF specific bind() address verification. */
331 if (!sp
->pf
->bind_verify(sp
, addr
))
332 return -EADDRNOTAVAIL
;
334 /* We must either be unbound, or bind to the same port.
335 * It's OK to allow 0 ports if we are already bound.
336 * We'll just inhert an already bound port in this case
341 else if (snum
!= bp
->port
) {
342 SCTP_DEBUG_PRINTK("sctp_do_bind:"
343 " New port %d does not match existing port "
344 "%d.\n", snum
, bp
->port
);
349 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
352 /* Make sure we are allowed to bind here.
353 * The function sctp_get_port_local() does duplicate address
356 if ((ret
= sctp_get_port_local(sk
, addr
))) {
357 if (ret
== (long) sk
) {
358 /* This endpoint has a conflicting address. */
365 /* Refresh ephemeral port. */
367 bp
->port
= inet_sk(sk
)->num
;
369 /* Add the address to the bind address list. */
370 sctp_local_bh_disable();
371 sctp_write_lock(&ep
->base
.addr_lock
);
373 /* Use GFP_ATOMIC since BHs are disabled. */
374 ret
= sctp_add_bind_addr(bp
, addr
, 1, GFP_ATOMIC
);
375 sctp_write_unlock(&ep
->base
.addr_lock
);
376 sctp_local_bh_enable();
378 /* Copy back into socket for getsockname() use. */
380 inet_sk(sk
)->sport
= htons(inet_sk(sk
)->num
);
381 af
->to_sk_saddr(addr
, sk
);
387 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
389 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
390 * at any one time. If a sender, after sending an ASCONF chunk, decides
391 * it needs to transfer another ASCONF Chunk, it MUST wait until the
392 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
393 * subsequent ASCONF. Note this restriction binds each side, so at any
394 * time two ASCONF may be in-transit on any given association (one sent
395 * from each endpoint).
397 static int sctp_send_asconf(struct sctp_association
*asoc
,
398 struct sctp_chunk
*chunk
)
402 /* If there is an outstanding ASCONF chunk, queue it for later
405 if (asoc
->addip_last_asconf
) {
406 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
410 /* Hold the chunk until an ASCONF_ACK is received. */
411 sctp_chunk_hold(chunk
);
412 retval
= sctp_primitive_ASCONF(asoc
, chunk
);
414 sctp_chunk_free(chunk
);
416 asoc
->addip_last_asconf
= chunk
;
422 /* Add a list of addresses as bind addresses to local endpoint or
425 * Basically run through each address specified in the addrs/addrcnt
426 * array/length pair, determine if it is IPv6 or IPv4 and call
427 * sctp_do_bind() on it.
429 * If any of them fails, then the operation will be reversed and the
430 * ones that were added will be removed.
432 * Only sctp_setsockopt_bindx() is supposed to call this function.
434 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
439 struct sockaddr
*sa_addr
;
442 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
446 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
447 /* The list may contain either IPv4 or IPv6 address;
448 * determine the address length for walking thru the list.
450 sa_addr
= (struct sockaddr
*)addr_buf
;
451 af
= sctp_get_af_specific(sa_addr
->sa_family
);
457 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
460 addr_buf
+= af
->sockaddr_len
;
464 /* Failed. Cleanup the ones that have been added */
466 sctp_bindx_rem(sk
, addrs
, cnt
);
474 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
475 * associations that are part of the endpoint indicating that a list of local
476 * addresses are added to the endpoint.
478 * If any of the addresses is already in the bind address list of the
479 * association, we do not send the chunk for that association. But it will not
480 * affect other associations.
482 * Only sctp_setsockopt_bindx() is supposed to call this function.
484 static int sctp_send_asconf_add_ip(struct sock
*sk
,
485 struct sockaddr
*addrs
,
488 struct sctp_sock
*sp
;
489 struct sctp_endpoint
*ep
;
490 struct sctp_association
*asoc
;
491 struct sctp_bind_addr
*bp
;
492 struct sctp_chunk
*chunk
;
493 struct sctp_sockaddr_entry
*laddr
;
494 union sctp_addr
*addr
;
495 union sctp_addr saveaddr
;
498 struct list_head
*pos
;
503 if (!sctp_addip_enable
)
509 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
510 __FUNCTION__
, sk
, addrs
, addrcnt
);
512 list_for_each(pos
, &ep
->asocs
) {
513 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
515 if (!asoc
->peer
.asconf_capable
)
518 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
521 if (!sctp_state(asoc
, ESTABLISHED
))
524 /* Check if any address in the packed array of addresses is
525 * in the bind address list of the association. If so,
526 * do not send the asconf chunk to its peer, but continue with
527 * other associations.
530 for (i
= 0; i
< addrcnt
; i
++) {
531 addr
= (union sctp_addr
*)addr_buf
;
532 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
538 if (sctp_assoc_lookup_laddr(asoc
, addr
))
541 addr_buf
+= af
->sockaddr_len
;
546 /* Use the first address in bind addr list of association as
547 * Address Parameter of ASCONF CHUNK.
549 sctp_read_lock(&asoc
->base
.addr_lock
);
550 bp
= &asoc
->base
.bind_addr
;
551 p
= bp
->address_list
.next
;
552 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
553 sctp_read_unlock(&asoc
->base
.addr_lock
);
555 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
556 addrcnt
, SCTP_PARAM_ADD_IP
);
562 retval
= sctp_send_asconf(asoc
, chunk
);
566 /* Add the new addresses to the bind address list with
567 * use_as_src set to 0.
569 sctp_local_bh_disable();
570 sctp_write_lock(&asoc
->base
.addr_lock
);
572 for (i
= 0; i
< addrcnt
; i
++) {
573 addr
= (union sctp_addr
*)addr_buf
;
574 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
575 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
576 retval
= sctp_add_bind_addr(bp
, &saveaddr
, 0,
578 addr_buf
+= af
->sockaddr_len
;
580 sctp_write_unlock(&asoc
->base
.addr_lock
);
581 sctp_local_bh_enable();
588 /* Remove a list of addresses from bind addresses list. Do not remove the
591 * Basically run through each address specified in the addrs/addrcnt
592 * array/length pair, determine if it is IPv6 or IPv4 and call
593 * sctp_del_bind() on it.
595 * If any of them fails, then the operation will be reversed and the
596 * ones that were removed will be added back.
598 * At least one address has to be left; if only one address is
599 * available, the operation will return -EBUSY.
601 * Only sctp_setsockopt_bindx() is supposed to call this function.
603 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
605 struct sctp_sock
*sp
= sctp_sk(sk
);
606 struct sctp_endpoint
*ep
= sp
->ep
;
608 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
611 union sctp_addr
*sa_addr
;
614 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
618 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
619 /* If the bind address list is empty or if there is only one
620 * bind address, there is nothing more to be removed (we need
621 * at least one address here).
623 if (list_empty(&bp
->address_list
) ||
624 (sctp_list_single_entry(&bp
->address_list
))) {
629 sa_addr
= (union sctp_addr
*)addr_buf
;
630 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
636 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
637 retval
= -EADDRNOTAVAIL
;
641 if (sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
646 /* FIXME - There is probably a need to check if sk->sk_saddr and
647 * sk->sk_rcv_addr are currently set to one of the addresses to
648 * be removed. This is something which needs to be looked into
649 * when we are fixing the outstanding issues with multi-homing
650 * socket routing and failover schemes. Refer to comments in
651 * sctp_do_bind(). -daisy
653 sctp_local_bh_disable();
654 sctp_write_lock(&ep
->base
.addr_lock
);
656 retval
= sctp_del_bind_addr(bp
, sa_addr
);
658 sctp_write_unlock(&ep
->base
.addr_lock
);
659 sctp_local_bh_enable();
661 addr_buf
+= af
->sockaddr_len
;
664 /* Failed. Add the ones that has been removed back */
666 sctp_bindx_add(sk
, addrs
, cnt
);
674 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
675 * the associations that are part of the endpoint indicating that a list of
676 * local addresses are removed from the endpoint.
678 * If any of the addresses is already in the bind address list of the
679 * association, we do not send the chunk for that association. But it will not
680 * affect other associations.
682 * Only sctp_setsockopt_bindx() is supposed to call this function.
684 static int sctp_send_asconf_del_ip(struct sock
*sk
,
685 struct sockaddr
*addrs
,
688 struct sctp_sock
*sp
;
689 struct sctp_endpoint
*ep
;
690 struct sctp_association
*asoc
;
691 struct sctp_transport
*transport
;
692 struct sctp_bind_addr
*bp
;
693 struct sctp_chunk
*chunk
;
694 union sctp_addr
*laddr
;
697 struct list_head
*pos
, *pos1
;
698 struct sctp_sockaddr_entry
*saddr
;
702 if (!sctp_addip_enable
)
708 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
709 __FUNCTION__
, sk
, addrs
, addrcnt
);
711 list_for_each(pos
, &ep
->asocs
) {
712 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
714 if (!asoc
->peer
.asconf_capable
)
717 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
720 if (!sctp_state(asoc
, ESTABLISHED
))
723 /* Check if any address in the packed array of addresses is
724 * not present in the bind address list of the association.
725 * If so, do not send the asconf chunk to its peer, but
726 * continue with other associations.
729 for (i
= 0; i
< addrcnt
; i
++) {
730 laddr
= (union sctp_addr
*)addr_buf
;
731 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
737 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
740 addr_buf
+= af
->sockaddr_len
;
745 /* Find one address in the association's bind address list
746 * that is not in the packed array of addresses. This is to
747 * make sure that we do not delete all the addresses in the
750 sctp_read_lock(&asoc
->base
.addr_lock
);
751 bp
= &asoc
->base
.bind_addr
;
752 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
754 sctp_read_unlock(&asoc
->base
.addr_lock
);
758 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
765 /* Reset use_as_src flag for the addresses in the bind address
766 * list that are to be deleted.
768 sctp_local_bh_disable();
769 sctp_write_lock(&asoc
->base
.addr_lock
);
771 for (i
= 0; i
< addrcnt
; i
++) {
772 laddr
= (union sctp_addr
*)addr_buf
;
773 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
774 list_for_each(pos1
, &bp
->address_list
) {
775 saddr
= list_entry(pos1
,
776 struct sctp_sockaddr_entry
,
778 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
779 saddr
->use_as_src
= 0;
781 addr_buf
+= af
->sockaddr_len
;
783 sctp_write_unlock(&asoc
->base
.addr_lock
);
784 sctp_local_bh_enable();
786 /* Update the route and saddr entries for all the transports
787 * as some of the addresses in the bind address list are
788 * about to be deleted and cannot be used as source addresses.
790 list_for_each(pos1
, &asoc
->peer
.transport_addr_list
) {
791 transport
= list_entry(pos1
, struct sctp_transport
,
793 dst_release(transport
->dst
);
794 sctp_transport_route(transport
, NULL
,
795 sctp_sk(asoc
->base
.sk
));
798 retval
= sctp_send_asconf(asoc
, chunk
);
804 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
807 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
810 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
811 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
814 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
815 * Section 3.1.2 for this usage.
817 * addrs is a pointer to an array of one or more socket addresses. Each
818 * address is contained in its appropriate structure (i.e. struct
819 * sockaddr_in or struct sockaddr_in6) the family of the address type
820 * must be used to distinguish the address length (note that this
821 * representation is termed a "packed array" of addresses). The caller
822 * specifies the number of addresses in the array with addrcnt.
824 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
825 * -1, and sets errno to the appropriate error code.
827 * For SCTP, the port given in each socket address must be the same, or
828 * sctp_bindx() will fail, setting errno to EINVAL.
830 * The flags parameter is formed from the bitwise OR of zero or more of
831 * the following currently defined flags:
833 * SCTP_BINDX_ADD_ADDR
835 * SCTP_BINDX_REM_ADDR
837 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
838 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
839 * addresses from the association. The two flags are mutually exclusive;
840 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
841 * not remove all addresses from an association; sctp_bindx() will
842 * reject such an attempt with EINVAL.
844 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
845 * additional addresses with an endpoint after calling bind(). Or use
846 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
847 * socket is associated with so that no new association accepted will be
848 * associated with those addresses. If the endpoint supports dynamic
849 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
850 * endpoint to send the appropriate message to the peer to change the
851 * peers address lists.
853 * Adding and removing addresses from a connected association is
854 * optional functionality. Implementations that do not support this
855 * functionality should return EOPNOTSUPP.
857 * Basically do nothing but copying the addresses from user to kernel
858 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
859 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
862 * We don't use copy_from_user() for optimization: we first do the
863 * sanity checks (buffer size -fast- and access check-healthy
864 * pointer); if all of those succeed, then we can alloc the memory
865 * (expensive operation) needed to copy the data to kernel. Then we do
866 * the copying without checking the user space area
867 * (__copy_from_user()).
869 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
872 * sk The sk of the socket
873 * addrs The pointer to the addresses in user land
874 * addrssize Size of the addrs buffer
875 * op Operation to perform (add or remove, see the flags of
878 * Returns 0 if ok, <0 errno code on error.
880 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
881 struct sockaddr __user
*addrs
,
882 int addrs_size
, int op
)
884 struct sockaddr
*kaddrs
;
888 struct sockaddr
*sa_addr
;
892 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
893 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
895 if (unlikely(addrs_size
<= 0))
898 /* Check the user passed a healthy pointer. */
899 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
902 /* Alloc space for the address array in kernel memory. */
903 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
904 if (unlikely(!kaddrs
))
907 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
912 /* Walk through the addrs buffer and count the number of addresses. */
914 while (walk_size
< addrs_size
) {
915 sa_addr
= (struct sockaddr
*)addr_buf
;
916 af
= sctp_get_af_specific(sa_addr
->sa_family
);
918 /* If the address family is not supported or if this address
919 * causes the address buffer to overflow return EINVAL.
921 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
926 addr_buf
+= af
->sockaddr_len
;
927 walk_size
+= af
->sockaddr_len
;
932 case SCTP_BINDX_ADD_ADDR
:
933 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
936 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
939 case SCTP_BINDX_REM_ADDR
:
940 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
943 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
957 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
959 * Common routine for handling connect() and sctp_connectx().
960 * Connect will come in with just a single address.
962 static int __sctp_connect(struct sock
* sk
,
963 struct sockaddr
*kaddrs
,
966 struct sctp_sock
*sp
;
967 struct sctp_endpoint
*ep
;
968 struct sctp_association
*asoc
= NULL
;
969 struct sctp_association
*asoc2
;
970 struct sctp_transport
*transport
;
978 union sctp_addr
*sa_addr
;
981 unsigned int f_flags
= 0;
986 /* connect() cannot be done on a socket that is already in ESTABLISHED
987 * state - UDP-style peeled off socket or a TCP-style socket that
988 * is already connected.
989 * It cannot be done even on a TCP-style listening socket.
991 if (sctp_sstate(sk
, ESTABLISHED
) ||
992 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
997 /* Walk through the addrs buffer and count the number of addresses. */
999 while (walk_size
< addrs_size
) {
1000 sa_addr
= (union sctp_addr
*)addr_buf
;
1001 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1002 port
= ntohs(sa_addr
->v4
.sin_port
);
1004 /* If the address family is not supported or if this address
1005 * causes the address buffer to overflow return EINVAL.
1007 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1012 err
= sctp_verify_addr(sk
, sa_addr
, af
->sockaddr_len
);
1016 /* Make sure the destination port is correctly set
1019 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
)
1022 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1024 /* Check if there already is a matching association on the
1025 * endpoint (other than the one created here).
1027 asoc2
= sctp_endpoint_lookup_assoc(ep
, sa_addr
, &transport
);
1028 if (asoc2
&& asoc2
!= asoc
) {
1029 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1036 /* If we could not find a matching association on the endpoint,
1037 * make sure that there is no peeled-off association matching
1038 * the peer address even on another socket.
1040 if (sctp_endpoint_is_peeled_off(ep
, sa_addr
)) {
1041 err
= -EADDRNOTAVAIL
;
1046 /* If a bind() or sctp_bindx() is not called prior to
1047 * an sctp_connectx() call, the system picks an
1048 * ephemeral port and will choose an address set
1049 * equivalent to binding with a wildcard address.
1051 if (!ep
->base
.bind_addr
.port
) {
1052 if (sctp_autobind(sk
)) {
1058 * If an unprivileged user inherits a 1-many
1059 * style socket with open associations on a
1060 * privileged port, it MAY be permitted to
1061 * accept new associations, but it SHOULD NOT
1062 * be permitted to open new associations.
1064 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1065 !capable(CAP_NET_BIND_SERVICE
)) {
1071 scope
= sctp_scope(sa_addr
);
1072 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1079 /* Prime the peer's transport structures. */
1080 transport
= sctp_assoc_add_peer(asoc
, sa_addr
, GFP_KERNEL
,
1088 addr_buf
+= af
->sockaddr_len
;
1089 walk_size
+= af
->sockaddr_len
;
1092 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1097 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1102 /* Initialize sk's dport and daddr for getpeername() */
1103 inet_sk(sk
)->dport
= htons(asoc
->peer
.port
);
1104 af
= sctp_get_af_specific(to
.sa
.sa_family
);
1105 af
->to_sk_daddr(&to
, sk
);
1108 /* in-kernel sockets don't generally have a file allocated to them
1109 * if all they do is call sock_create_kern().
1111 if (sk
->sk_socket
->file
)
1112 f_flags
= sk
->sk_socket
->file
->f_flags
;
1114 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1116 err
= sctp_wait_for_connect(asoc
, &timeo
);
1118 /* Don't free association on exit. */
1123 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1124 " kaddrs: %p err: %d\n",
1127 sctp_association_free(asoc
);
1131 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1134 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
1136 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1137 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1138 * or IPv6 addresses.
1140 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1141 * Section 3.1.2 for this usage.
1143 * addrs is a pointer to an array of one or more socket addresses. Each
1144 * address is contained in its appropriate structure (i.e. struct
1145 * sockaddr_in or struct sockaddr_in6) the family of the address type
1146 * must be used to distengish the address length (note that this
1147 * representation is termed a "packed array" of addresses). The caller
1148 * specifies the number of addresses in the array with addrcnt.
1150 * On success, sctp_connectx() returns 0. On failure, sctp_connectx() returns
1151 * -1, and sets errno to the appropriate error code.
1153 * For SCTP, the port given in each socket address must be the same, or
1154 * sctp_connectx() will fail, setting errno to EINVAL.
1156 * An application can use sctp_connectx to initiate an association with
1157 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1158 * allows a caller to specify multiple addresses at which a peer can be
1159 * reached. The way the SCTP stack uses the list of addresses to set up
1160 * the association is implementation dependant. This function only
1161 * specifies that the stack will try to make use of all the addresses in
1162 * the list when needed.
1164 * Note that the list of addresses passed in is only used for setting up
1165 * the association. It does not necessarily equal the set of addresses
1166 * the peer uses for the resulting association. If the caller wants to
1167 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1168 * retrieve them after the association has been set up.
1170 * Basically do nothing but copying the addresses from user to kernel
1171 * land and invoking either sctp_connectx(). This is used for tunneling
1172 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1174 * We don't use copy_from_user() for optimization: we first do the
1175 * sanity checks (buffer size -fast- and access check-healthy
1176 * pointer); if all of those succeed, then we can alloc the memory
1177 * (expensive operation) needed to copy the data to kernel. Then we do
1178 * the copying without checking the user space area
1179 * (__copy_from_user()).
1181 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1184 * sk The sk of the socket
1185 * addrs The pointer to the addresses in user land
1186 * addrssize Size of the addrs buffer
1188 * Returns 0 if ok, <0 errno code on error.
1190 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1191 struct sockaddr __user
*addrs
,
1195 struct sockaddr
*kaddrs
;
1197 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1198 __FUNCTION__
, sk
, addrs
, addrs_size
);
1200 if (unlikely(addrs_size
<= 0))
1203 /* Check the user passed a healthy pointer. */
1204 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1207 /* Alloc space for the address array in kernel memory. */
1208 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1209 if (unlikely(!kaddrs
))
1212 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1215 err
= __sctp_connect(sk
, kaddrs
, addrs_size
);
1222 /* API 3.1.4 close() - UDP Style Syntax
1223 * Applications use close() to perform graceful shutdown (as described in
1224 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1225 * by a UDP-style socket.
1229 * ret = close(int sd);
1231 * sd - the socket descriptor of the associations to be closed.
1233 * To gracefully shutdown a specific association represented by the
1234 * UDP-style socket, an application should use the sendmsg() call,
1235 * passing no user data, but including the appropriate flag in the
1236 * ancillary data (see Section xxxx).
1238 * If sd in the close() call is a branched-off socket representing only
1239 * one association, the shutdown is performed on that association only.
1241 * 4.1.6 close() - TCP Style Syntax
1243 * Applications use close() to gracefully close down an association.
1247 * int close(int sd);
1249 * sd - the socket descriptor of the association to be closed.
1251 * After an application calls close() on a socket descriptor, no further
1252 * socket operations will succeed on that descriptor.
1254 * API 7.1.4 SO_LINGER
1256 * An application using the TCP-style socket can use this option to
1257 * perform the SCTP ABORT primitive. The linger option structure is:
1260 * int l_onoff; // option on/off
1261 * int l_linger; // linger time
1264 * To enable the option, set l_onoff to 1. If the l_linger value is set
1265 * to 0, calling close() is the same as the ABORT primitive. If the
1266 * value is set to a negative value, the setsockopt() call will return
1267 * an error. If the value is set to a positive value linger_time, the
1268 * close() can be blocked for at most linger_time ms. If the graceful
1269 * shutdown phase does not finish during this period, close() will
1270 * return but the graceful shutdown phase continues in the system.
1272 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1274 struct sctp_endpoint
*ep
;
1275 struct sctp_association
*asoc
;
1276 struct list_head
*pos
, *temp
;
1278 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1281 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1283 ep
= sctp_sk(sk
)->ep
;
1285 /* Walk all associations on an endpoint. */
1286 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1287 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1289 if (sctp_style(sk
, TCP
)) {
1290 /* A closed association can still be in the list if
1291 * it belongs to a TCP-style listening socket that is
1292 * not yet accepted. If so, free it. If not, send an
1293 * ABORT or SHUTDOWN based on the linger options.
1295 if (sctp_state(asoc
, CLOSED
)) {
1296 sctp_unhash_established(asoc
);
1297 sctp_association_free(asoc
);
1302 if (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
) {
1303 struct sctp_chunk
*chunk
;
1305 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1307 sctp_primitive_ABORT(asoc
, chunk
);
1309 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1312 /* Clean up any skbs sitting on the receive queue. */
1313 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1314 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1316 /* On a TCP-style socket, block for at most linger_time if set. */
1317 if (sctp_style(sk
, TCP
) && timeout
)
1318 sctp_wait_for_close(sk
, timeout
);
1320 /* This will run the backlog queue. */
1321 sctp_release_sock(sk
);
1323 /* Supposedly, no process has access to the socket, but
1324 * the net layers still may.
1326 sctp_local_bh_disable();
1327 sctp_bh_lock_sock(sk
);
1329 /* Hold the sock, since sk_common_release() will put sock_put()
1330 * and we have just a little more cleanup.
1333 sk_common_release(sk
);
1335 sctp_bh_unlock_sock(sk
);
1336 sctp_local_bh_enable();
1340 SCTP_DBG_OBJCNT_DEC(sock
);
1343 /* Handle EPIPE error. */
1344 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1347 err
= sock_error(sk
) ? : -EPIPE
;
1348 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1349 send_sig(SIGPIPE
, current
, 0);
1353 /* API 3.1.3 sendmsg() - UDP Style Syntax
1355 * An application uses sendmsg() and recvmsg() calls to transmit data to
1356 * and receive data from its peer.
1358 * ssize_t sendmsg(int socket, const struct msghdr *message,
1361 * socket - the socket descriptor of the endpoint.
1362 * message - pointer to the msghdr structure which contains a single
1363 * user message and possibly some ancillary data.
1365 * See Section 5 for complete description of the data
1368 * flags - flags sent or received with the user message, see Section
1369 * 5 for complete description of the flags.
1371 * Note: This function could use a rewrite especially when explicit
1372 * connect support comes in.
1374 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1376 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1378 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1379 struct msghdr
*msg
, size_t msg_len
)
1381 struct sctp_sock
*sp
;
1382 struct sctp_endpoint
*ep
;
1383 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1384 struct sctp_transport
*transport
, *chunk_tp
;
1385 struct sctp_chunk
*chunk
;
1387 struct sockaddr
*msg_name
= NULL
;
1388 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1389 struct sctp_sndrcvinfo
*sinfo
;
1390 struct sctp_initmsg
*sinit
;
1391 sctp_assoc_t associd
= 0;
1392 sctp_cmsgs_t cmsgs
= { NULL
};
1396 __u16 sinfo_flags
= 0;
1397 struct sctp_datamsg
*datamsg
;
1398 struct list_head
*pos
;
1399 int msg_flags
= msg
->msg_flags
;
1401 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1408 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1410 /* We cannot send a message over a TCP-style listening socket. */
1411 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1416 /* Parse out the SCTP CMSGs. */
1417 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1420 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1424 /* Fetch the destination address for this packet. This
1425 * address only selects the association--it is not necessarily
1426 * the address we will send to.
1427 * For a peeled-off socket, msg_name is ignored.
1429 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1430 int msg_namelen
= msg
->msg_namelen
;
1432 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1437 if (msg_namelen
> sizeof(to
))
1438 msg_namelen
= sizeof(to
);
1439 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1440 msg_name
= msg
->msg_name
;
1446 /* Did the user specify SNDRCVINFO? */
1448 sinfo_flags
= sinfo
->sinfo_flags
;
1449 associd
= sinfo
->sinfo_assoc_id
;
1452 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1453 msg_len
, sinfo_flags
);
1455 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1456 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1461 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1462 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1463 * If SCTP_ABORT is set, the message length could be non zero with
1464 * the msg_iov set to the user abort reason.
1466 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1467 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1472 /* If SCTP_ADDR_OVER is set, there must be an address
1473 * specified in msg_name.
1475 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1482 SCTP_DEBUG_PRINTK("About to look up association.\n");
1486 /* If a msg_name has been specified, assume this is to be used. */
1488 /* Look for a matching association on the endpoint. */
1489 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1491 /* If we could not find a matching association on the
1492 * endpoint, make sure that it is not a TCP-style
1493 * socket that already has an association or there is
1494 * no peeled-off association on another socket.
1496 if ((sctp_style(sk
, TCP
) &&
1497 sctp_sstate(sk
, ESTABLISHED
)) ||
1498 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1499 err
= -EADDRNOTAVAIL
;
1504 asoc
= sctp_id2assoc(sk
, associd
);
1512 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1514 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1515 * socket that has an association in CLOSED state. This can
1516 * happen when an accepted socket has an association that is
1519 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1524 if (sinfo_flags
& SCTP_EOF
) {
1525 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1527 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1531 if (sinfo_flags
& SCTP_ABORT
) {
1532 struct sctp_chunk
*chunk
;
1534 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1540 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1541 sctp_primitive_ABORT(asoc
, chunk
);
1547 /* Do we need to create the association? */
1549 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1551 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1556 /* Check for invalid stream against the stream counts,
1557 * either the default or the user specified stream counts.
1560 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1561 /* Check against the defaults. */
1562 if (sinfo
->sinfo_stream
>=
1563 sp
->initmsg
.sinit_num_ostreams
) {
1568 /* Check against the requested. */
1569 if (sinfo
->sinfo_stream
>=
1570 sinit
->sinit_num_ostreams
) {
1578 * API 3.1.2 bind() - UDP Style Syntax
1579 * If a bind() or sctp_bindx() is not called prior to a
1580 * sendmsg() call that initiates a new association, the
1581 * system picks an ephemeral port and will choose an address
1582 * set equivalent to binding with a wildcard address.
1584 if (!ep
->base
.bind_addr
.port
) {
1585 if (sctp_autobind(sk
)) {
1591 * If an unprivileged user inherits a one-to-many
1592 * style socket with open associations on a privileged
1593 * port, it MAY be permitted to accept new associations,
1594 * but it SHOULD NOT be permitted to open new
1597 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1598 !capable(CAP_NET_BIND_SERVICE
)) {
1604 scope
= sctp_scope(&to
);
1605 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1612 /* If the SCTP_INIT ancillary data is specified, set all
1613 * the association init values accordingly.
1616 if (sinit
->sinit_num_ostreams
) {
1617 asoc
->c
.sinit_num_ostreams
=
1618 sinit
->sinit_num_ostreams
;
1620 if (sinit
->sinit_max_instreams
) {
1621 asoc
->c
.sinit_max_instreams
=
1622 sinit
->sinit_max_instreams
;
1624 if (sinit
->sinit_max_attempts
) {
1625 asoc
->max_init_attempts
1626 = sinit
->sinit_max_attempts
;
1628 if (sinit
->sinit_max_init_timeo
) {
1629 asoc
->max_init_timeo
=
1630 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1634 /* Prime the peer's transport structures. */
1635 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1640 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1647 /* ASSERT: we have a valid association at this point. */
1648 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1651 /* If the user didn't specify SNDRCVINFO, make up one with
1654 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1655 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1656 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1657 default_sinfo
.sinfo_context
= asoc
->default_context
;
1658 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1659 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1660 sinfo
= &default_sinfo
;
1663 /* API 7.1.7, the sndbuf size per association bounds the
1664 * maximum size of data that can be sent in a single send call.
1666 if (msg_len
> sk
->sk_sndbuf
) {
1671 if (asoc
->pmtu_pending
)
1672 sctp_assoc_pending_pmtu(asoc
);
1674 /* If fragmentation is disabled and the message length exceeds the
1675 * association fragmentation point, return EMSGSIZE. The I-D
1676 * does not specify what this error is, but this looks like
1679 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1685 /* Check for invalid stream. */
1686 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1692 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1693 if (!sctp_wspace(asoc
)) {
1694 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1699 /* If an address is passed with the sendto/sendmsg call, it is used
1700 * to override the primary destination address in the TCP model, or
1701 * when SCTP_ADDR_OVER flag is set in the UDP model.
1703 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1704 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1705 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1713 /* Auto-connect, if we aren't connected already. */
1714 if (sctp_state(asoc
, CLOSED
)) {
1715 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1718 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1721 /* Break the message into multiple chunks of maximum size. */
1722 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1728 /* Now send the (possibly) fragmented message. */
1729 list_for_each(pos
, &datamsg
->chunks
) {
1730 chunk
= list_entry(pos
, struct sctp_chunk
, frag_list
);
1731 sctp_datamsg_track(chunk
);
1733 /* Do accounting for the write space. */
1734 sctp_set_owner_w(chunk
);
1736 chunk
->transport
= chunk_tp
;
1738 /* Send it to the lower layers. Note: all chunks
1739 * must either fail or succeed. The lower layer
1740 * works that way today. Keep it that way or this
1743 err
= sctp_primitive_SEND(asoc
, chunk
);
1744 /* Did the lower layer accept the chunk? */
1746 sctp_chunk_free(chunk
);
1747 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1750 sctp_datamsg_free(datamsg
);
1756 /* If we are already past ASSOCIATE, the lower
1757 * layers are responsible for association cleanup.
1763 sctp_association_free(asoc
);
1765 sctp_release_sock(sk
);
1768 return sctp_error(sk
, msg_flags
, err
);
1775 err
= sock_error(sk
);
1785 /* This is an extended version of skb_pull() that removes the data from the
1786 * start of a skb even when data is spread across the list of skb's in the
1787 * frag_list. len specifies the total amount of data that needs to be removed.
1788 * when 'len' bytes could be removed from the skb, it returns 0.
1789 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1790 * could not be removed.
1792 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1794 struct sk_buff
*list
;
1795 int skb_len
= skb_headlen(skb
);
1798 if (len
<= skb_len
) {
1799 __skb_pull(skb
, len
);
1803 __skb_pull(skb
, skb_len
);
1805 for (list
= skb_shinfo(skb
)->frag_list
; list
; list
= list
->next
) {
1806 rlen
= sctp_skb_pull(list
, len
);
1807 skb
->len
-= (len
-rlen
);
1808 skb
->data_len
-= (len
-rlen
);
1819 /* API 3.1.3 recvmsg() - UDP Style Syntax
1821 * ssize_t recvmsg(int socket, struct msghdr *message,
1824 * socket - the socket descriptor of the endpoint.
1825 * message - pointer to the msghdr structure which contains a single
1826 * user message and possibly some ancillary data.
1828 * See Section 5 for complete description of the data
1831 * flags - flags sent or received with the user message, see Section
1832 * 5 for complete description of the flags.
1834 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1836 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1837 struct msghdr
*msg
, size_t len
, int noblock
,
1838 int flags
, int *addr_len
)
1840 struct sctp_ulpevent
*event
= NULL
;
1841 struct sctp_sock
*sp
= sctp_sk(sk
);
1842 struct sk_buff
*skb
;
1847 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1848 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1849 "len", len
, "knoblauch", noblock
,
1850 "flags", flags
, "addr_len", addr_len
);
1854 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1859 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1863 /* Get the total length of the skb including any skb's in the
1872 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1874 event
= sctp_skb2event(skb
);
1879 sock_recv_timestamp(msg
, sk
, skb
);
1880 if (sctp_ulpevent_is_notification(event
)) {
1881 msg
->msg_flags
|= MSG_NOTIFICATION
;
1882 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1884 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1887 /* Check if we allow SCTP_SNDRCVINFO. */
1888 if (sp
->subscribe
.sctp_data_io_event
)
1889 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1891 /* FIXME: we should be calling IP/IPv6 layers. */
1892 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1893 ip_cmsg_recv(msg
, skb
);
1898 /* If skb's length exceeds the user's buffer, update the skb and
1899 * push it back to the receive_queue so that the next call to
1900 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1902 if (skb_len
> copied
) {
1903 msg
->msg_flags
&= ~MSG_EOR
;
1904 if (flags
& MSG_PEEK
)
1906 sctp_skb_pull(skb
, copied
);
1907 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1909 /* When only partial message is copied to the user, increase
1910 * rwnd by that amount. If all the data in the skb is read,
1911 * rwnd is updated when the event is freed.
1913 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
1915 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
1916 (event
->msg_flags
& MSG_EOR
))
1917 msg
->msg_flags
|= MSG_EOR
;
1919 msg
->msg_flags
&= ~MSG_EOR
;
1922 if (flags
& MSG_PEEK
) {
1923 /* Release the skb reference acquired after peeking the skb in
1924 * sctp_skb_recv_datagram().
1928 /* Free the event which includes releasing the reference to
1929 * the owner of the skb, freeing the skb and updating the
1932 sctp_ulpevent_free(event
);
1935 sctp_release_sock(sk
);
1939 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1941 * This option is a on/off flag. If enabled no SCTP message
1942 * fragmentation will be performed. Instead if a message being sent
1943 * exceeds the current PMTU size, the message will NOT be sent and
1944 * instead a error will be indicated to the user.
1946 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
1947 char __user
*optval
, int optlen
)
1951 if (optlen
< sizeof(int))
1954 if (get_user(val
, (int __user
*)optval
))
1957 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
1962 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
1965 if (optlen
!= sizeof(struct sctp_event_subscribe
))
1967 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
1972 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
1974 * This socket option is applicable to the UDP-style socket only. When
1975 * set it will cause associations that are idle for more than the
1976 * specified number of seconds to automatically close. An association
1977 * being idle is defined an association that has NOT sent or received
1978 * user data. The special value of '0' indicates that no automatic
1979 * close of any associations should be performed. The option expects an
1980 * integer defining the number of seconds of idle time before an
1981 * association is closed.
1983 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
1986 struct sctp_sock
*sp
= sctp_sk(sk
);
1988 /* Applicable to UDP-style socket only */
1989 if (sctp_style(sk
, TCP
))
1991 if (optlen
!= sizeof(int))
1993 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
1999 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2001 * Applications can enable or disable heartbeats for any peer address of
2002 * an association, modify an address's heartbeat interval, force a
2003 * heartbeat to be sent immediately, and adjust the address's maximum
2004 * number of retransmissions sent before an address is considered
2005 * unreachable. The following structure is used to access and modify an
2006 * address's parameters:
2008 * struct sctp_paddrparams {
2009 * sctp_assoc_t spp_assoc_id;
2010 * struct sockaddr_storage spp_address;
2011 * uint32_t spp_hbinterval;
2012 * uint16_t spp_pathmaxrxt;
2013 * uint32_t spp_pathmtu;
2014 * uint32_t spp_sackdelay;
2015 * uint32_t spp_flags;
2018 * spp_assoc_id - (one-to-many style socket) This is filled in the
2019 * application, and identifies the association for
2021 * spp_address - This specifies which address is of interest.
2022 * spp_hbinterval - This contains the value of the heartbeat interval,
2023 * in milliseconds. If a value of zero
2024 * is present in this field then no changes are to
2025 * be made to this parameter.
2026 * spp_pathmaxrxt - This contains the maximum number of
2027 * retransmissions before this address shall be
2028 * considered unreachable. If a value of zero
2029 * is present in this field then no changes are to
2030 * be made to this parameter.
2031 * spp_pathmtu - When Path MTU discovery is disabled the value
2032 * specified here will be the "fixed" path mtu.
2033 * Note that if the spp_address field is empty
2034 * then all associations on this address will
2035 * have this fixed path mtu set upon them.
2037 * spp_sackdelay - When delayed sack is enabled, this value specifies
2038 * the number of milliseconds that sacks will be delayed
2039 * for. This value will apply to all addresses of an
2040 * association if the spp_address field is empty. Note
2041 * also, that if delayed sack is enabled and this
2042 * value is set to 0, no change is made to the last
2043 * recorded delayed sack timer value.
2045 * spp_flags - These flags are used to control various features
2046 * on an association. The flag field may contain
2047 * zero or more of the following options.
2049 * SPP_HB_ENABLE - Enable heartbeats on the
2050 * specified address. Note that if the address
2051 * field is empty all addresses for the association
2052 * have heartbeats enabled upon them.
2054 * SPP_HB_DISABLE - Disable heartbeats on the
2055 * speicifed address. Note that if the address
2056 * field is empty all addresses for the association
2057 * will have their heartbeats disabled. Note also
2058 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2059 * mutually exclusive, only one of these two should
2060 * be specified. Enabling both fields will have
2061 * undetermined results.
2063 * SPP_HB_DEMAND - Request a user initiated heartbeat
2064 * to be made immediately.
2066 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2067 * heartbeat delayis to be set to the value of 0
2070 * SPP_PMTUD_ENABLE - This field will enable PMTU
2071 * discovery upon the specified address. Note that
2072 * if the address feild is empty then all addresses
2073 * on the association are effected.
2075 * SPP_PMTUD_DISABLE - This field will disable PMTU
2076 * discovery upon the specified address. Note that
2077 * if the address feild is empty then all addresses
2078 * on the association are effected. Not also that
2079 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2080 * exclusive. Enabling both will have undetermined
2083 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2084 * on delayed sack. The time specified in spp_sackdelay
2085 * is used to specify the sack delay for this address. Note
2086 * that if spp_address is empty then all addresses will
2087 * enable delayed sack and take on the sack delay
2088 * value specified in spp_sackdelay.
2089 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2090 * off delayed sack. If the spp_address field is blank then
2091 * delayed sack is disabled for the entire association. Note
2092 * also that this field is mutually exclusive to
2093 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2096 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2097 struct sctp_transport
*trans
,
2098 struct sctp_association
*asoc
,
2099 struct sctp_sock
*sp
,
2102 int sackdelay_change
)
2106 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2107 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2112 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2113 * this field is ignored. Note also that a value of zero indicates
2114 * the current setting should be left unchanged.
2116 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2118 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2119 * set. This lets us use 0 value when this flag
2122 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2123 params
->spp_hbinterval
= 0;
2125 if (params
->spp_hbinterval
||
2126 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2129 msecs_to_jiffies(params
->spp_hbinterval
);
2132 msecs_to_jiffies(params
->spp_hbinterval
);
2134 sp
->hbinterval
= params
->spp_hbinterval
;
2141 trans
->param_flags
=
2142 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2145 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2148 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2152 /* When Path MTU discovery is disabled the value specified here will
2153 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2154 * include the flag SPP_PMTUD_DISABLE for this field to have any
2157 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2159 trans
->pathmtu
= params
->spp_pathmtu
;
2160 sctp_assoc_sync_pmtu(asoc
);
2162 asoc
->pathmtu
= params
->spp_pathmtu
;
2163 sctp_frag_point(sp
, params
->spp_pathmtu
);
2165 sp
->pathmtu
= params
->spp_pathmtu
;
2171 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2172 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2173 trans
->param_flags
=
2174 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2176 sctp_transport_pmtu(trans
);
2177 sctp_assoc_sync_pmtu(asoc
);
2181 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2184 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2188 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2189 * value of this field is ignored. Note also that a value of zero
2190 * indicates the current setting should be left unchanged.
2192 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2195 msecs_to_jiffies(params
->spp_sackdelay
);
2198 msecs_to_jiffies(params
->spp_sackdelay
);
2200 sp
->sackdelay
= params
->spp_sackdelay
;
2204 if (sackdelay_change
) {
2206 trans
->param_flags
=
2207 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2211 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2215 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2220 /* Note that unless the spp_flag is set to SPP_PMTUD_ENABLE the value
2221 * of this field is ignored. Note also that a value of zero
2222 * indicates the current setting should be left unchanged.
2224 if ((params
->spp_flags
& SPP_PMTUD_ENABLE
) && params
->spp_pathmaxrxt
) {
2226 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2228 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2230 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2237 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2238 char __user
*optval
, int optlen
)
2240 struct sctp_paddrparams params
;
2241 struct sctp_transport
*trans
= NULL
;
2242 struct sctp_association
*asoc
= NULL
;
2243 struct sctp_sock
*sp
= sctp_sk(sk
);
2245 int hb_change
, pmtud_change
, sackdelay_change
;
2247 if (optlen
!= sizeof(struct sctp_paddrparams
))
2250 if (copy_from_user(¶ms
, optval
, optlen
))
2253 /* Validate flags and value parameters. */
2254 hb_change
= params
.spp_flags
& SPP_HB
;
2255 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2256 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2258 if (hb_change
== SPP_HB
||
2259 pmtud_change
== SPP_PMTUD
||
2260 sackdelay_change
== SPP_SACKDELAY
||
2261 params
.spp_sackdelay
> 500 ||
2263 && params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2266 /* If an address other than INADDR_ANY is specified, and
2267 * no transport is found, then the request is invalid.
2269 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
2270 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2271 params
.spp_assoc_id
);
2276 /* Get association, if assoc_id != 0 and the socket is a one
2277 * to many style socket, and an association was not found, then
2278 * the id was invalid.
2280 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2281 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2284 /* Heartbeat demand can only be sent on a transport or
2285 * association, but not a socket.
2287 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2290 /* Process parameters. */
2291 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2292 hb_change
, pmtud_change
,
2298 /* If changes are for association, also apply parameters to each
2301 if (!trans
&& asoc
) {
2302 struct list_head
*pos
;
2304 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2305 trans
= list_entry(pos
, struct sctp_transport
,
2307 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2308 hb_change
, pmtud_change
,
2316 /* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
2318 * This options will get or set the delayed ack timer. The time is set
2319 * in milliseconds. If the assoc_id is 0, then this sets or gets the
2320 * endpoints default delayed ack timer value. If the assoc_id field is
2321 * non-zero, then the set or get effects the specified association.
2323 * struct sctp_assoc_value {
2324 * sctp_assoc_t assoc_id;
2325 * uint32_t assoc_value;
2328 * assoc_id - This parameter, indicates which association the
2329 * user is preforming an action upon. Note that if
2330 * this field's value is zero then the endpoints
2331 * default value is changed (effecting future
2332 * associations only).
2334 * assoc_value - This parameter contains the number of milliseconds
2335 * that the user is requesting the delayed ACK timer
2336 * be set to. Note that this value is defined in
2337 * the standard to be between 200 and 500 milliseconds.
2339 * Note: a value of zero will leave the value alone,
2340 * but disable SACK delay. A non-zero value will also
2341 * enable SACK delay.
2344 static int sctp_setsockopt_delayed_ack_time(struct sock
*sk
,
2345 char __user
*optval
, int optlen
)
2347 struct sctp_assoc_value params
;
2348 struct sctp_transport
*trans
= NULL
;
2349 struct sctp_association
*asoc
= NULL
;
2350 struct sctp_sock
*sp
= sctp_sk(sk
);
2352 if (optlen
!= sizeof(struct sctp_assoc_value
))
2355 if (copy_from_user(¶ms
, optval
, optlen
))
2358 /* Validate value parameter. */
2359 if (params
.assoc_value
> 500)
2362 /* Get association, if assoc_id != 0 and the socket is a one
2363 * to many style socket, and an association was not found, then
2364 * the id was invalid.
2366 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2367 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
2370 if (params
.assoc_value
) {
2373 msecs_to_jiffies(params
.assoc_value
);
2375 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2376 SPP_SACKDELAY_ENABLE
;
2378 sp
->sackdelay
= params
.assoc_value
;
2380 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2381 SPP_SACKDELAY_ENABLE
;
2386 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2387 SPP_SACKDELAY_DISABLE
;
2390 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2391 SPP_SACKDELAY_DISABLE
;
2395 /* If change is for association, also apply to each transport. */
2397 struct list_head
*pos
;
2399 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2400 trans
= list_entry(pos
, struct sctp_transport
,
2402 if (params
.assoc_value
) {
2404 msecs_to_jiffies(params
.assoc_value
);
2405 trans
->param_flags
=
2406 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2407 SPP_SACKDELAY_ENABLE
;
2409 trans
->param_flags
=
2410 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2411 SPP_SACKDELAY_DISABLE
;
2419 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2421 * Applications can specify protocol parameters for the default association
2422 * initialization. The option name argument to setsockopt() and getsockopt()
2425 * Setting initialization parameters is effective only on an unconnected
2426 * socket (for UDP-style sockets only future associations are effected
2427 * by the change). With TCP-style sockets, this option is inherited by
2428 * sockets derived from a listener socket.
2430 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, int optlen
)
2432 struct sctp_initmsg sinit
;
2433 struct sctp_sock
*sp
= sctp_sk(sk
);
2435 if (optlen
!= sizeof(struct sctp_initmsg
))
2437 if (copy_from_user(&sinit
, optval
, optlen
))
2440 if (sinit
.sinit_num_ostreams
)
2441 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2442 if (sinit
.sinit_max_instreams
)
2443 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2444 if (sinit
.sinit_max_attempts
)
2445 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2446 if (sinit
.sinit_max_init_timeo
)
2447 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2453 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2455 * Applications that wish to use the sendto() system call may wish to
2456 * specify a default set of parameters that would normally be supplied
2457 * through the inclusion of ancillary data. This socket option allows
2458 * such an application to set the default sctp_sndrcvinfo structure.
2459 * The application that wishes to use this socket option simply passes
2460 * in to this call the sctp_sndrcvinfo structure defined in Section
2461 * 5.2.2) The input parameters accepted by this call include
2462 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2463 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2464 * to this call if the caller is using the UDP model.
2466 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2467 char __user
*optval
, int optlen
)
2469 struct sctp_sndrcvinfo info
;
2470 struct sctp_association
*asoc
;
2471 struct sctp_sock
*sp
= sctp_sk(sk
);
2473 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2475 if (copy_from_user(&info
, optval
, optlen
))
2478 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2479 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2483 asoc
->default_stream
= info
.sinfo_stream
;
2484 asoc
->default_flags
= info
.sinfo_flags
;
2485 asoc
->default_ppid
= info
.sinfo_ppid
;
2486 asoc
->default_context
= info
.sinfo_context
;
2487 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2489 sp
->default_stream
= info
.sinfo_stream
;
2490 sp
->default_flags
= info
.sinfo_flags
;
2491 sp
->default_ppid
= info
.sinfo_ppid
;
2492 sp
->default_context
= info
.sinfo_context
;
2493 sp
->default_timetolive
= info
.sinfo_timetolive
;
2499 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2501 * Requests that the local SCTP stack use the enclosed peer address as
2502 * the association primary. The enclosed address must be one of the
2503 * association peer's addresses.
2505 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2508 struct sctp_prim prim
;
2509 struct sctp_transport
*trans
;
2511 if (optlen
!= sizeof(struct sctp_prim
))
2514 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2517 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2521 sctp_assoc_set_primary(trans
->asoc
, trans
);
2527 * 7.1.5 SCTP_NODELAY
2529 * Turn on/off any Nagle-like algorithm. This means that packets are
2530 * generally sent as soon as possible and no unnecessary delays are
2531 * introduced, at the cost of more packets in the network. Expects an
2532 * integer boolean flag.
2534 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2539 if (optlen
< sizeof(int))
2541 if (get_user(val
, (int __user
*)optval
))
2544 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2550 * 7.1.1 SCTP_RTOINFO
2552 * The protocol parameters used to initialize and bound retransmission
2553 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2554 * and modify these parameters.
2555 * All parameters are time values, in milliseconds. A value of 0, when
2556 * modifying the parameters, indicates that the current value should not
2560 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, int optlen
) {
2561 struct sctp_rtoinfo rtoinfo
;
2562 struct sctp_association
*asoc
;
2564 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2567 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2570 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2572 /* Set the values to the specific association */
2573 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2577 if (rtoinfo
.srto_initial
!= 0)
2579 msecs_to_jiffies(rtoinfo
.srto_initial
);
2580 if (rtoinfo
.srto_max
!= 0)
2581 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2582 if (rtoinfo
.srto_min
!= 0)
2583 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2585 /* If there is no association or the association-id = 0
2586 * set the values to the endpoint.
2588 struct sctp_sock
*sp
= sctp_sk(sk
);
2590 if (rtoinfo
.srto_initial
!= 0)
2591 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2592 if (rtoinfo
.srto_max
!= 0)
2593 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2594 if (rtoinfo
.srto_min
!= 0)
2595 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2603 * 7.1.2 SCTP_ASSOCINFO
2605 * This option is used to tune the maximum retransmission attempts
2606 * of the association.
2607 * Returns an error if the new association retransmission value is
2608 * greater than the sum of the retransmission value of the peer.
2609 * See [SCTP] for more information.
2612 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, int optlen
)
2615 struct sctp_assocparams assocparams
;
2616 struct sctp_association
*asoc
;
2618 if (optlen
!= sizeof(struct sctp_assocparams
))
2620 if (copy_from_user(&assocparams
, optval
, optlen
))
2623 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2625 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2628 /* Set the values to the specific association */
2630 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2633 struct list_head
*pos
;
2634 struct sctp_transport
*peer_addr
;
2636 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2637 peer_addr
= list_entry(pos
,
2638 struct sctp_transport
,
2640 path_sum
+= peer_addr
->pathmaxrxt
;
2644 /* Only validate asocmaxrxt if we have more then
2645 * one path/transport. We do this because path
2646 * retransmissions are only counted when we have more
2650 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2653 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2656 if (assocparams
.sasoc_cookie_life
!= 0) {
2657 asoc
->cookie_life
.tv_sec
=
2658 assocparams
.sasoc_cookie_life
/ 1000;
2659 asoc
->cookie_life
.tv_usec
=
2660 (assocparams
.sasoc_cookie_life
% 1000)
2664 /* Set the values to the endpoint */
2665 struct sctp_sock
*sp
= sctp_sk(sk
);
2667 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2668 sp
->assocparams
.sasoc_asocmaxrxt
=
2669 assocparams
.sasoc_asocmaxrxt
;
2670 if (assocparams
.sasoc_cookie_life
!= 0)
2671 sp
->assocparams
.sasoc_cookie_life
=
2672 assocparams
.sasoc_cookie_life
;
2678 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2680 * This socket option is a boolean flag which turns on or off mapped V4
2681 * addresses. If this option is turned on and the socket is type
2682 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2683 * If this option is turned off, then no mapping will be done of V4
2684 * addresses and a user will receive both PF_INET6 and PF_INET type
2685 * addresses on the socket.
2687 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, int optlen
)
2690 struct sctp_sock
*sp
= sctp_sk(sk
);
2692 if (optlen
< sizeof(int))
2694 if (get_user(val
, (int __user
*)optval
))
2705 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2707 * This socket option specifies the maximum size to put in any outgoing
2708 * SCTP chunk. If a message is larger than this size it will be
2709 * fragmented by SCTP into the specified size. Note that the underlying
2710 * SCTP implementation may fragment into smaller sized chunks when the
2711 * PMTU of the underlying association is smaller than the value set by
2714 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, int optlen
)
2716 struct sctp_association
*asoc
;
2717 struct list_head
*pos
;
2718 struct sctp_sock
*sp
= sctp_sk(sk
);
2721 if (optlen
< sizeof(int))
2723 if (get_user(val
, (int __user
*)optval
))
2725 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2727 sp
->user_frag
= val
;
2729 /* Update the frag_point of the existing associations. */
2730 list_for_each(pos
, &(sp
->ep
->asocs
)) {
2731 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
2732 asoc
->frag_point
= sctp_frag_point(sp
, asoc
->pathmtu
);
2740 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2742 * Requests that the peer mark the enclosed address as the association
2743 * primary. The enclosed address must be one of the association's
2744 * locally bound addresses. The following structure is used to make a
2745 * set primary request:
2747 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2750 struct sctp_sock
*sp
;
2751 struct sctp_endpoint
*ep
;
2752 struct sctp_association
*asoc
= NULL
;
2753 struct sctp_setpeerprim prim
;
2754 struct sctp_chunk
*chunk
;
2760 if (!sctp_addip_enable
)
2763 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2766 if (copy_from_user(&prim
, optval
, optlen
))
2769 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2773 if (!asoc
->peer
.asconf_capable
)
2776 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2779 if (!sctp_state(asoc
, ESTABLISHED
))
2782 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2783 return -EADDRNOTAVAIL
;
2785 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2786 chunk
= sctp_make_asconf_set_prim(asoc
,
2787 (union sctp_addr
*)&prim
.sspp_addr
);
2791 err
= sctp_send_asconf(asoc
, chunk
);
2793 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2798 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
2801 struct sctp_setadaptation adaptation
;
2803 if (optlen
!= sizeof(struct sctp_setadaptation
))
2805 if (copy_from_user(&adaptation
, optval
, optlen
))
2808 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
2814 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2816 * The context field in the sctp_sndrcvinfo structure is normally only
2817 * used when a failed message is retrieved holding the value that was
2818 * sent down on the actual send call. This option allows the setting of
2819 * a default context on an association basis that will be received on
2820 * reading messages from the peer. This is especially helpful in the
2821 * one-2-many model for an application to keep some reference to an
2822 * internal state machine that is processing messages on the
2823 * association. Note that the setting of this value only effects
2824 * received messages from the peer and does not effect the value that is
2825 * saved with outbound messages.
2827 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
2830 struct sctp_assoc_value params
;
2831 struct sctp_sock
*sp
;
2832 struct sctp_association
*asoc
;
2834 if (optlen
!= sizeof(struct sctp_assoc_value
))
2836 if (copy_from_user(¶ms
, optval
, optlen
))
2841 if (params
.assoc_id
!= 0) {
2842 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2845 asoc
->default_rcv_context
= params
.assoc_value
;
2847 sp
->default_rcv_context
= params
.assoc_value
;
2854 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
2856 * This options will at a minimum specify if the implementation is doing
2857 * fragmented interleave. Fragmented interleave, for a one to many
2858 * socket, is when subsequent calls to receive a message may return
2859 * parts of messages from different associations. Some implementations
2860 * may allow you to turn this value on or off. If so, when turned off,
2861 * no fragment interleave will occur (which will cause a head of line
2862 * blocking amongst multiple associations sharing the same one to many
2863 * socket). When this option is turned on, then each receive call may
2864 * come from a different association (thus the user must receive data
2865 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
2866 * association each receive belongs to.
2868 * This option takes a boolean value. A non-zero value indicates that
2869 * fragmented interleave is on. A value of zero indicates that
2870 * fragmented interleave is off.
2872 * Note that it is important that an implementation that allows this
2873 * option to be turned on, have it off by default. Otherwise an unaware
2874 * application using the one to many model may become confused and act
2877 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
2878 char __user
*optval
,
2883 if (optlen
!= sizeof(int))
2885 if (get_user(val
, (int __user
*)optval
))
2888 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
2894 * 7.1.25. Set or Get the sctp partial delivery point
2895 * (SCTP_PARTIAL_DELIVERY_POINT)
2896 * This option will set or get the SCTP partial delivery point. This
2897 * point is the size of a message where the partial delivery API will be
2898 * invoked to help free up rwnd space for the peer. Setting this to a
2899 * lower value will cause partial delivery's to happen more often. The
2900 * calls argument is an integer that sets or gets the partial delivery
2903 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
2904 char __user
*optval
,
2909 if (optlen
!= sizeof(u32
))
2911 if (get_user(val
, (int __user
*)optval
))
2914 sctp_sk(sk
)->pd_point
= val
;
2916 return 0; /* is this the right error code? */
2920 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
2922 * This option will allow a user to change the maximum burst of packets
2923 * that can be emitted by this association. Note that the default value
2924 * is 4, and some implementations may restrict this setting so that it
2925 * can only be lowered.
2927 * NOTE: This text doesn't seem right. Do this on a socket basis with
2928 * future associations inheriting the socket value.
2930 static int sctp_setsockopt_maxburst(struct sock
*sk
,
2931 char __user
*optval
,
2936 if (optlen
!= sizeof(int))
2938 if (get_user(val
, (int __user
*)optval
))
2944 sctp_sk(sk
)->max_burst
= val
;
2949 /* API 6.2 setsockopt(), getsockopt()
2951 * Applications use setsockopt() and getsockopt() to set or retrieve
2952 * socket options. Socket options are used to change the default
2953 * behavior of sockets calls. They are described in Section 7.
2957 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
2958 * int __user *optlen);
2959 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
2962 * sd - the socket descript.
2963 * level - set to IPPROTO_SCTP for all SCTP options.
2964 * optname - the option name.
2965 * optval - the buffer to store the value of the option.
2966 * optlen - the size of the buffer.
2968 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
2969 char __user
*optval
, int optlen
)
2973 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
2976 /* I can hardly begin to describe how wrong this is. This is
2977 * so broken as to be worse than useless. The API draft
2978 * REALLY is NOT helpful here... I am not convinced that the
2979 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
2980 * are at all well-founded.
2982 if (level
!= SOL_SCTP
) {
2983 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
2984 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2991 case SCTP_SOCKOPT_BINDX_ADD
:
2992 /* 'optlen' is the size of the addresses buffer. */
2993 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2994 optlen
, SCTP_BINDX_ADD_ADDR
);
2997 case SCTP_SOCKOPT_BINDX_REM
:
2998 /* 'optlen' is the size of the addresses buffer. */
2999 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3000 optlen
, SCTP_BINDX_REM_ADDR
);
3003 case SCTP_SOCKOPT_CONNECTX
:
3004 /* 'optlen' is the size of the addresses buffer. */
3005 retval
= sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)optval
,
3009 case SCTP_DISABLE_FRAGMENTS
:
3010 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3014 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3017 case SCTP_AUTOCLOSE
:
3018 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3021 case SCTP_PEER_ADDR_PARAMS
:
3022 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3025 case SCTP_DELAYED_ACK_TIME
:
3026 retval
= sctp_setsockopt_delayed_ack_time(sk
, optval
, optlen
);
3028 case SCTP_PARTIAL_DELIVERY_POINT
:
3029 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3033 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3035 case SCTP_DEFAULT_SEND_PARAM
:
3036 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3039 case SCTP_PRIMARY_ADDR
:
3040 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3042 case SCTP_SET_PEER_PRIMARY_ADDR
:
3043 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3046 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3049 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3051 case SCTP_ASSOCINFO
:
3052 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3054 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3055 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3058 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3060 case SCTP_ADAPTATION_LAYER
:
3061 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3064 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3066 case SCTP_FRAGMENT_INTERLEAVE
:
3067 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3069 case SCTP_MAX_BURST
:
3070 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3073 retval
= -ENOPROTOOPT
;
3077 sctp_release_sock(sk
);
3083 /* API 3.1.6 connect() - UDP Style Syntax
3085 * An application may use the connect() call in the UDP model to initiate an
3086 * association without sending data.
3090 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3092 * sd: the socket descriptor to have a new association added to.
3094 * nam: the address structure (either struct sockaddr_in or struct
3095 * sockaddr_in6 defined in RFC2553 [7]).
3097 * len: the size of the address.
3099 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3107 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3108 __FUNCTION__
, sk
, addr
, addr_len
);
3110 /* Validate addr_len before calling common connect/connectx routine. */
3111 af
= sctp_get_af_specific(addr
->sa_family
);
3112 if (!af
|| addr_len
< af
->sockaddr_len
) {
3115 /* Pass correct addr len to common routine (so it knows there
3116 * is only one address being passed.
3118 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
);
3121 sctp_release_sock(sk
);
3125 /* FIXME: Write comments. */
3126 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
3128 return -EOPNOTSUPP
; /* STUB */
3131 /* 4.1.4 accept() - TCP Style Syntax
3133 * Applications use accept() call to remove an established SCTP
3134 * association from the accept queue of the endpoint. A new socket
3135 * descriptor will be returned from accept() to represent the newly
3136 * formed association.
3138 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3140 struct sctp_sock
*sp
;
3141 struct sctp_endpoint
*ep
;
3142 struct sock
*newsk
= NULL
;
3143 struct sctp_association
*asoc
;
3152 if (!sctp_style(sk
, TCP
)) {
3153 error
= -EOPNOTSUPP
;
3157 if (!sctp_sstate(sk
, LISTENING
)) {
3162 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3164 error
= sctp_wait_for_accept(sk
, timeo
);
3168 /* We treat the list of associations on the endpoint as the accept
3169 * queue and pick the first association on the list.
3171 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3173 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3179 /* Populate the fields of the newsk from the oldsk and migrate the
3180 * asoc to the newsk.
3182 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3185 sctp_release_sock(sk
);
3190 /* The SCTP ioctl handler. */
3191 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3193 return -ENOIOCTLCMD
;
3196 /* This is the function which gets called during socket creation to
3197 * initialized the SCTP-specific portion of the sock.
3198 * The sock structure should already be zero-filled memory.
3200 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
3202 struct sctp_endpoint
*ep
;
3203 struct sctp_sock
*sp
;
3205 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3209 /* Initialize the SCTP per socket area. */
3210 switch (sk
->sk_type
) {
3211 case SOCK_SEQPACKET
:
3212 sp
->type
= SCTP_SOCKET_UDP
;
3215 sp
->type
= SCTP_SOCKET_TCP
;
3218 return -ESOCKTNOSUPPORT
;
3221 /* Initialize default send parameters. These parameters can be
3222 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3224 sp
->default_stream
= 0;
3225 sp
->default_ppid
= 0;
3226 sp
->default_flags
= 0;
3227 sp
->default_context
= 0;
3228 sp
->default_timetolive
= 0;
3230 sp
->default_rcv_context
= 0;
3231 sp
->max_burst
= sctp_max_burst
;
3233 /* Initialize default setup parameters. These parameters
3234 * can be modified with the SCTP_INITMSG socket option or
3235 * overridden by the SCTP_INIT CMSG.
3237 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3238 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3239 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3240 sp
->initmsg
.sinit_max_init_timeo
= sctp_rto_max
;
3242 /* Initialize default RTO related parameters. These parameters can
3243 * be modified for with the SCTP_RTOINFO socket option.
3245 sp
->rtoinfo
.srto_initial
= sctp_rto_initial
;
3246 sp
->rtoinfo
.srto_max
= sctp_rto_max
;
3247 sp
->rtoinfo
.srto_min
= sctp_rto_min
;
3249 /* Initialize default association related parameters. These parameters
3250 * can be modified with the SCTP_ASSOCINFO socket option.
3252 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3253 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3254 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3255 sp
->assocparams
.sasoc_local_rwnd
= 0;
3256 sp
->assocparams
.sasoc_cookie_life
= sctp_valid_cookie_life
;
3258 /* Initialize default event subscriptions. By default, all the
3261 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3263 /* Default Peer Address Parameters. These defaults can
3264 * be modified via SCTP_PEER_ADDR_PARAMS
3266 sp
->hbinterval
= sctp_hb_interval
;
3267 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3268 sp
->pathmtu
= 0; // allow default discovery
3269 sp
->sackdelay
= sctp_sack_timeout
;
3270 sp
->param_flags
= SPP_HB_ENABLE
|
3272 SPP_SACKDELAY_ENABLE
;
3274 /* If enabled no SCTP message fragmentation will be performed.
3275 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3277 sp
->disable_fragments
= 0;
3279 /* Enable Nagle algorithm by default. */
3282 /* Enable by default. */
3285 /* Auto-close idle associations after the configured
3286 * number of seconds. A value of 0 disables this
3287 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3288 * for UDP-style sockets only.
3292 /* User specified fragmentation limit. */
3295 sp
->adaptation_ind
= 0;
3297 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3299 /* Control variables for partial data delivery. */
3300 atomic_set(&sp
->pd_mode
, 0);
3301 skb_queue_head_init(&sp
->pd_lobby
);
3302 sp
->frag_interleave
= 0;
3304 /* Create a per socket endpoint structure. Even if we
3305 * change the data structure relationships, this may still
3306 * be useful for storing pre-connect address information.
3308 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3315 SCTP_DBG_OBJCNT_INC(sock
);
3319 /* Cleanup any SCTP per socket resources. */
3320 SCTP_STATIC
int sctp_destroy_sock(struct sock
*sk
)
3322 struct sctp_endpoint
*ep
;
3324 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3326 /* Release our hold on the endpoint. */
3327 ep
= sctp_sk(sk
)->ep
;
3328 sctp_endpoint_free(ep
);
3333 /* API 4.1.7 shutdown() - TCP Style Syntax
3334 * int shutdown(int socket, int how);
3336 * sd - the socket descriptor of the association to be closed.
3337 * how - Specifies the type of shutdown. The values are
3340 * Disables further receive operations. No SCTP
3341 * protocol action is taken.
3343 * Disables further send operations, and initiates
3344 * the SCTP shutdown sequence.
3346 * Disables further send and receive operations
3347 * and initiates the SCTP shutdown sequence.
3349 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3351 struct sctp_endpoint
*ep
;
3352 struct sctp_association
*asoc
;
3354 if (!sctp_style(sk
, TCP
))
3357 if (how
& SEND_SHUTDOWN
) {
3358 ep
= sctp_sk(sk
)->ep
;
3359 if (!list_empty(&ep
->asocs
)) {
3360 asoc
= list_entry(ep
->asocs
.next
,
3361 struct sctp_association
, asocs
);
3362 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3367 /* 7.2.1 Association Status (SCTP_STATUS)
3369 * Applications can retrieve current status information about an
3370 * association, including association state, peer receiver window size,
3371 * number of unacked data chunks, and number of data chunks pending
3372 * receipt. This information is read-only.
3374 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3375 char __user
*optval
,
3378 struct sctp_status status
;
3379 struct sctp_association
*asoc
= NULL
;
3380 struct sctp_transport
*transport
;
3381 sctp_assoc_t associd
;
3384 if (len
< sizeof(status
)) {
3389 len
= sizeof(status
);
3390 if (copy_from_user(&status
, optval
, len
)) {
3395 associd
= status
.sstat_assoc_id
;
3396 asoc
= sctp_id2assoc(sk
, associd
);
3402 transport
= asoc
->peer
.primary_path
;
3404 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3405 status
.sstat_state
= asoc
->state
;
3406 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3407 status
.sstat_unackdata
= asoc
->unack_data
;
3409 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3410 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3411 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3412 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3413 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3414 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
3415 transport
->af_specific
->sockaddr_len
);
3416 /* Map ipv4 address into v4-mapped-on-v6 address. */
3417 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3418 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3419 status
.sstat_primary
.spinfo_state
= transport
->state
;
3420 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3421 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3422 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3423 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3425 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3426 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3428 if (put_user(len
, optlen
)) {
3433 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3434 len
, status
.sstat_state
, status
.sstat_rwnd
,
3435 status
.sstat_assoc_id
);
3437 if (copy_to_user(optval
, &status
, len
)) {
3447 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3449 * Applications can retrieve information about a specific peer address
3450 * of an association, including its reachability state, congestion
3451 * window, and retransmission timer values. This information is
3454 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3455 char __user
*optval
,
3458 struct sctp_paddrinfo pinfo
;
3459 struct sctp_transport
*transport
;
3462 if (len
< sizeof(pinfo
)) {
3467 len
= sizeof(pinfo
);
3468 if (copy_from_user(&pinfo
, optval
, len
)) {
3473 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3474 pinfo
.spinfo_assoc_id
);
3478 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3479 pinfo
.spinfo_state
= transport
->state
;
3480 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3481 pinfo
.spinfo_srtt
= transport
->srtt
;
3482 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3483 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3485 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3486 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3488 if (put_user(len
, optlen
)) {
3493 if (copy_to_user(optval
, &pinfo
, len
)) {
3502 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3504 * This option is a on/off flag. If enabled no SCTP message
3505 * fragmentation will be performed. Instead if a message being sent
3506 * exceeds the current PMTU size, the message will NOT be sent and
3507 * instead a error will be indicated to the user.
3509 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3510 char __user
*optval
, int __user
*optlen
)
3514 if (len
< sizeof(int))
3518 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3519 if (put_user(len
, optlen
))
3521 if (copy_to_user(optval
, &val
, len
))
3526 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3528 * This socket option is used to specify various notifications and
3529 * ancillary data the user wishes to receive.
3531 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
3534 if (len
< sizeof(struct sctp_event_subscribe
))
3536 len
= sizeof(struct sctp_event_subscribe
);
3537 if (put_user(len
, optlen
))
3539 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
3544 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3546 * This socket option is applicable to the UDP-style socket only. When
3547 * set it will cause associations that are idle for more than the
3548 * specified number of seconds to automatically close. An association
3549 * being idle is defined an association that has NOT sent or received
3550 * user data. The special value of '0' indicates that no automatic
3551 * close of any associations should be performed. The option expects an
3552 * integer defining the number of seconds of idle time before an
3553 * association is closed.
3555 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3557 /* Applicable to UDP-style socket only */
3558 if (sctp_style(sk
, TCP
))
3560 if (len
< sizeof(int))
3563 if (put_user(len
, optlen
))
3565 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
3570 /* Helper routine to branch off an association to a new socket. */
3571 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3572 struct socket
**sockp
)
3574 struct sock
*sk
= asoc
->base
.sk
;
3575 struct socket
*sock
;
3576 struct inet_sock
*inetsk
;
3580 /* An association cannot be branched off from an already peeled-off
3581 * socket, nor is this supported for tcp style sockets.
3583 if (!sctp_style(sk
, UDP
))
3586 /* Create a new socket. */
3587 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
3591 /* Populate the fields of the newsk from the oldsk and migrate the
3592 * asoc to the newsk.
3594 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
3596 /* Make peeled-off sockets more like 1-1 accepted sockets.
3597 * Set the daddr and initialize id to something more random
3599 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
3600 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
3601 inetsk
= inet_sk(sock
->sk
);
3602 inetsk
->id
= asoc
->next_tsn
^ jiffies
;
3609 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3611 sctp_peeloff_arg_t peeloff
;
3612 struct socket
*newsock
;
3614 struct sctp_association
*asoc
;
3616 if (len
< sizeof(sctp_peeloff_arg_t
))
3618 len
= sizeof(sctp_peeloff_arg_t
);
3619 if (copy_from_user(&peeloff
, optval
, len
))
3622 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
3628 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __FUNCTION__
, sk
, asoc
);
3630 retval
= sctp_do_peeloff(asoc
, &newsock
);
3634 /* Map the socket to an unused fd that can be returned to the user. */
3635 retval
= sock_map_fd(newsock
);
3637 sock_release(newsock
);
3641 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3642 __FUNCTION__
, sk
, asoc
, newsock
->sk
, retval
);
3644 /* Return the fd mapped to the new socket. */
3645 peeloff
.sd
= retval
;
3646 if (put_user(len
, optlen
))
3648 if (copy_to_user(optval
, &peeloff
, len
))
3655 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3657 * Applications can enable or disable heartbeats for any peer address of
3658 * an association, modify an address's heartbeat interval, force a
3659 * heartbeat to be sent immediately, and adjust the address's maximum
3660 * number of retransmissions sent before an address is considered
3661 * unreachable. The following structure is used to access and modify an
3662 * address's parameters:
3664 * struct sctp_paddrparams {
3665 * sctp_assoc_t spp_assoc_id;
3666 * struct sockaddr_storage spp_address;
3667 * uint32_t spp_hbinterval;
3668 * uint16_t spp_pathmaxrxt;
3669 * uint32_t spp_pathmtu;
3670 * uint32_t spp_sackdelay;
3671 * uint32_t spp_flags;
3674 * spp_assoc_id - (one-to-many style socket) This is filled in the
3675 * application, and identifies the association for
3677 * spp_address - This specifies which address is of interest.
3678 * spp_hbinterval - This contains the value of the heartbeat interval,
3679 * in milliseconds. If a value of zero
3680 * is present in this field then no changes are to
3681 * be made to this parameter.
3682 * spp_pathmaxrxt - This contains the maximum number of
3683 * retransmissions before this address shall be
3684 * considered unreachable. If a value of zero
3685 * is present in this field then no changes are to
3686 * be made to this parameter.
3687 * spp_pathmtu - When Path MTU discovery is disabled the value
3688 * specified here will be the "fixed" path mtu.
3689 * Note that if the spp_address field is empty
3690 * then all associations on this address will
3691 * have this fixed path mtu set upon them.
3693 * spp_sackdelay - When delayed sack is enabled, this value specifies
3694 * the number of milliseconds that sacks will be delayed
3695 * for. This value will apply to all addresses of an
3696 * association if the spp_address field is empty. Note
3697 * also, that if delayed sack is enabled and this
3698 * value is set to 0, no change is made to the last
3699 * recorded delayed sack timer value.
3701 * spp_flags - These flags are used to control various features
3702 * on an association. The flag field may contain
3703 * zero or more of the following options.
3705 * SPP_HB_ENABLE - Enable heartbeats on the
3706 * specified address. Note that if the address
3707 * field is empty all addresses for the association
3708 * have heartbeats enabled upon them.
3710 * SPP_HB_DISABLE - Disable heartbeats on the
3711 * speicifed address. Note that if the address
3712 * field is empty all addresses for the association
3713 * will have their heartbeats disabled. Note also
3714 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
3715 * mutually exclusive, only one of these two should
3716 * be specified. Enabling both fields will have
3717 * undetermined results.
3719 * SPP_HB_DEMAND - Request a user initiated heartbeat
3720 * to be made immediately.
3722 * SPP_PMTUD_ENABLE - This field will enable PMTU
3723 * discovery upon the specified address. Note that
3724 * if the address feild is empty then all addresses
3725 * on the association are effected.
3727 * SPP_PMTUD_DISABLE - This field will disable PMTU
3728 * discovery upon the specified address. Note that
3729 * if the address feild is empty then all addresses
3730 * on the association are effected. Not also that
3731 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
3732 * exclusive. Enabling both will have undetermined
3735 * SPP_SACKDELAY_ENABLE - Setting this flag turns
3736 * on delayed sack. The time specified in spp_sackdelay
3737 * is used to specify the sack delay for this address. Note
3738 * that if spp_address is empty then all addresses will
3739 * enable delayed sack and take on the sack delay
3740 * value specified in spp_sackdelay.
3741 * SPP_SACKDELAY_DISABLE - Setting this flag turns
3742 * off delayed sack. If the spp_address field is blank then
3743 * delayed sack is disabled for the entire association. Note
3744 * also that this field is mutually exclusive to
3745 * SPP_SACKDELAY_ENABLE, setting both will have undefined
3748 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
3749 char __user
*optval
, int __user
*optlen
)
3751 struct sctp_paddrparams params
;
3752 struct sctp_transport
*trans
= NULL
;
3753 struct sctp_association
*asoc
= NULL
;
3754 struct sctp_sock
*sp
= sctp_sk(sk
);
3756 if (len
< sizeof(struct sctp_paddrparams
))
3758 len
= sizeof(struct sctp_paddrparams
);
3759 if (copy_from_user(¶ms
, optval
, len
))
3762 /* If an address other than INADDR_ANY is specified, and
3763 * no transport is found, then the request is invalid.
3765 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
3766 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
3767 params
.spp_assoc_id
);
3769 SCTP_DEBUG_PRINTK("Failed no transport\n");
3774 /* Get association, if assoc_id != 0 and the socket is a one
3775 * to many style socket, and an association was not found, then
3776 * the id was invalid.
3778 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
3779 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
3780 SCTP_DEBUG_PRINTK("Failed no association\n");
3785 /* Fetch transport values. */
3786 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
3787 params
.spp_pathmtu
= trans
->pathmtu
;
3788 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
3789 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
3791 /*draft-11 doesn't say what to return in spp_flags*/
3792 params
.spp_flags
= trans
->param_flags
;
3794 /* Fetch association values. */
3795 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
3796 params
.spp_pathmtu
= asoc
->pathmtu
;
3797 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
3798 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
3800 /*draft-11 doesn't say what to return in spp_flags*/
3801 params
.spp_flags
= asoc
->param_flags
;
3803 /* Fetch socket values. */
3804 params
.spp_hbinterval
= sp
->hbinterval
;
3805 params
.spp_pathmtu
= sp
->pathmtu
;
3806 params
.spp_sackdelay
= sp
->sackdelay
;
3807 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
3809 /*draft-11 doesn't say what to return in spp_flags*/
3810 params
.spp_flags
= sp
->param_flags
;
3813 if (copy_to_user(optval
, ¶ms
, len
))
3816 if (put_user(len
, optlen
))
3822 /* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
3824 * This options will get or set the delayed ack timer. The time is set
3825 * in milliseconds. If the assoc_id is 0, then this sets or gets the
3826 * endpoints default delayed ack timer value. If the assoc_id field is
3827 * non-zero, then the set or get effects the specified association.
3829 * struct sctp_assoc_value {
3830 * sctp_assoc_t assoc_id;
3831 * uint32_t assoc_value;
3834 * assoc_id - This parameter, indicates which association the
3835 * user is preforming an action upon. Note that if
3836 * this field's value is zero then the endpoints
3837 * default value is changed (effecting future
3838 * associations only).
3840 * assoc_value - This parameter contains the number of milliseconds
3841 * that the user is requesting the delayed ACK timer
3842 * be set to. Note that this value is defined in
3843 * the standard to be between 200 and 500 milliseconds.
3845 * Note: a value of zero will leave the value alone,
3846 * but disable SACK delay. A non-zero value will also
3847 * enable SACK delay.
3849 static int sctp_getsockopt_delayed_ack_time(struct sock
*sk
, int len
,
3850 char __user
*optval
,
3853 struct sctp_assoc_value params
;
3854 struct sctp_association
*asoc
= NULL
;
3855 struct sctp_sock
*sp
= sctp_sk(sk
);
3857 if (len
< sizeof(struct sctp_assoc_value
))
3860 len
= sizeof(struct sctp_assoc_value
);
3862 if (copy_from_user(¶ms
, optval
, len
))
3865 /* Get association, if assoc_id != 0 and the socket is a one
3866 * to many style socket, and an association was not found, then
3867 * the id was invalid.
3869 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3870 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
3874 /* Fetch association values. */
3875 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
)
3876 params
.assoc_value
= jiffies_to_msecs(
3879 params
.assoc_value
= 0;
3881 /* Fetch socket values. */
3882 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
)
3883 params
.assoc_value
= sp
->sackdelay
;
3885 params
.assoc_value
= 0;
3888 if (copy_to_user(optval
, ¶ms
, len
))
3891 if (put_user(len
, optlen
))
3897 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
3899 * Applications can specify protocol parameters for the default association
3900 * initialization. The option name argument to setsockopt() and getsockopt()
3903 * Setting initialization parameters is effective only on an unconnected
3904 * socket (for UDP-style sockets only future associations are effected
3905 * by the change). With TCP-style sockets, this option is inherited by
3906 * sockets derived from a listener socket.
3908 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3910 if (len
< sizeof(struct sctp_initmsg
))
3912 len
= sizeof(struct sctp_initmsg
);
3913 if (put_user(len
, optlen
))
3915 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
3920 static int sctp_getsockopt_peer_addrs_num_old(struct sock
*sk
, int len
,
3921 char __user
*optval
,
3925 struct sctp_association
*asoc
;
3926 struct list_head
*pos
;
3929 if (len
< sizeof(sctp_assoc_t
))
3932 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
3935 /* For UDP-style sockets, id specifies the association to query. */
3936 asoc
= sctp_id2assoc(sk
, id
);
3940 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3948 * Old API for getting list of peer addresses. Does not work for 32-bit
3949 * programs running on a 64-bit kernel
3951 static int sctp_getsockopt_peer_addrs_old(struct sock
*sk
, int len
,
3952 char __user
*optval
,
3955 struct sctp_association
*asoc
;
3956 struct list_head
*pos
;
3958 struct sctp_getaddrs_old getaddrs
;
3959 struct sctp_transport
*from
;
3961 union sctp_addr temp
;
3962 struct sctp_sock
*sp
= sctp_sk(sk
);
3965 if (len
< sizeof(struct sctp_getaddrs_old
))
3968 len
= sizeof(struct sctp_getaddrs_old
);
3970 if (copy_from_user(&getaddrs
, optval
, len
))
3973 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
3975 /* For UDP-style sockets, id specifies the association to query. */
3976 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3980 to
= (void __user
*)getaddrs
.addrs
;
3981 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3982 from
= list_entry(pos
, struct sctp_transport
, transports
);
3983 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
3984 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3985 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3986 if (copy_to_user(to
, &temp
, addrlen
))
3990 if (cnt
>= getaddrs
.addr_num
) break;
3992 getaddrs
.addr_num
= cnt
;
3993 if (put_user(len
, optlen
))
3995 if (copy_to_user(optval
, &getaddrs
, len
))
4001 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4002 char __user
*optval
, int __user
*optlen
)
4004 struct sctp_association
*asoc
;
4005 struct list_head
*pos
;
4007 struct sctp_getaddrs getaddrs
;
4008 struct sctp_transport
*from
;
4010 union sctp_addr temp
;
4011 struct sctp_sock
*sp
= sctp_sk(sk
);
4016 if (len
< sizeof(struct sctp_getaddrs
))
4019 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4022 /* For UDP-style sockets, id specifies the association to query. */
4023 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4027 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4028 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4030 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4031 from
= list_entry(pos
, struct sctp_transport
, transports
);
4032 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4033 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4034 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
4035 if (space_left
< addrlen
)
4037 if (copy_to_user(to
, &temp
, addrlen
))
4041 space_left
-= addrlen
;
4044 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4046 bytes_copied
= ((char __user
*)to
) - optval
;
4047 if (put_user(bytes_copied
, optlen
))
4053 static int sctp_getsockopt_local_addrs_num_old(struct sock
*sk
, int len
,
4054 char __user
*optval
,
4058 struct sctp_bind_addr
*bp
;
4059 struct sctp_association
*asoc
;
4060 struct list_head
*pos
, *temp
;
4061 struct sctp_sockaddr_entry
*addr
;
4062 rwlock_t
*addr_lock
;
4065 if (len
< sizeof(sctp_assoc_t
))
4068 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
4072 * For UDP-style sockets, id specifies the association to query.
4073 * If the id field is set to the value '0' then the locally bound
4074 * addresses are returned without regard to any particular
4078 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4079 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4081 asoc
= sctp_id2assoc(sk
, id
);
4084 bp
= &asoc
->base
.bind_addr
;
4085 addr_lock
= &asoc
->base
.addr_lock
;
4088 sctp_read_lock(addr_lock
);
4090 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
4091 * addresses from the global local address list.
4093 if (sctp_list_single_entry(&bp
->address_list
)) {
4094 addr
= list_entry(bp
->address_list
.next
,
4095 struct sctp_sockaddr_entry
, list
);
4096 if (sctp_is_any(&addr
->a
)) {
4097 list_for_each_safe(pos
, temp
, &sctp_local_addr_list
) {
4098 addr
= list_entry(pos
,
4099 struct sctp_sockaddr_entry
,
4101 if ((PF_INET
== sk
->sk_family
) &&
4102 (AF_INET6
== addr
->a
.sa
.sa_family
))
4112 list_for_each(pos
, &bp
->address_list
) {
4117 sctp_read_unlock(addr_lock
);
4121 /* Helper function that copies local addresses to user and returns the number
4122 * of addresses copied.
4124 static int sctp_copy_laddrs_old(struct sock
*sk
, __u16 port
,
4125 int max_addrs
, void *to
,
4128 struct list_head
*pos
, *next
;
4129 struct sctp_sockaddr_entry
*addr
;
4130 union sctp_addr temp
;
4134 list_for_each_safe(pos
, next
, &sctp_local_addr_list
) {
4135 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4136 if ((PF_INET
== sk
->sk_family
) &&
4137 (AF_INET6
== addr
->a
.sa
.sa_family
))
4139 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4140 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4142 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4143 memcpy(to
, &temp
, addrlen
);
4146 *bytes_copied
+= addrlen
;
4148 if (cnt
>= max_addrs
) break;
4154 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4155 size_t space_left
, int *bytes_copied
)
4157 struct list_head
*pos
, *next
;
4158 struct sctp_sockaddr_entry
*addr
;
4159 union sctp_addr temp
;
4163 list_for_each_safe(pos
, next
, &sctp_local_addr_list
) {
4164 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4165 if ((PF_INET
== sk
->sk_family
) &&
4166 (AF_INET6
== addr
->a
.sa
.sa_family
))
4168 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4169 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4171 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4172 if (space_left
< addrlen
)
4174 memcpy(to
, &temp
, addrlen
);
4178 space_left
-= addrlen
;
4179 *bytes_copied
+= addrlen
;
4185 /* Old API for getting list of local addresses. Does not work for 32-bit
4186 * programs running on a 64-bit kernel
4188 static int sctp_getsockopt_local_addrs_old(struct sock
*sk
, int len
,
4189 char __user
*optval
, int __user
*optlen
)
4191 struct sctp_bind_addr
*bp
;
4192 struct sctp_association
*asoc
;
4193 struct list_head
*pos
;
4195 struct sctp_getaddrs_old getaddrs
;
4196 struct sctp_sockaddr_entry
*addr
;
4198 union sctp_addr temp
;
4199 struct sctp_sock
*sp
= sctp_sk(sk
);
4201 rwlock_t
*addr_lock
;
4205 int bytes_copied
= 0;
4207 if (len
< sizeof(struct sctp_getaddrs_old
))
4210 len
= sizeof(struct sctp_getaddrs_old
);
4211 if (copy_from_user(&getaddrs
, optval
, len
))
4214 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
4216 * For UDP-style sockets, id specifies the association to query.
4217 * If the id field is set to the value '0' then the locally bound
4218 * addresses are returned without regard to any particular
4221 if (0 == getaddrs
.assoc_id
) {
4222 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4223 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4225 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4228 bp
= &asoc
->base
.bind_addr
;
4229 addr_lock
= &asoc
->base
.addr_lock
;
4232 to
= getaddrs
.addrs
;
4234 /* Allocate space for a local instance of packed array to hold all
4235 * the data. We store addresses here first and then put write them
4236 * to the user in one shot.
4238 addrs
= kmalloc(sizeof(union sctp_addr
) * getaddrs
.addr_num
,
4243 sctp_read_lock(addr_lock
);
4245 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4246 * addresses from the global local address list.
4248 if (sctp_list_single_entry(&bp
->address_list
)) {
4249 addr
= list_entry(bp
->address_list
.next
,
4250 struct sctp_sockaddr_entry
, list
);
4251 if (sctp_is_any(&addr
->a
)) {
4252 cnt
= sctp_copy_laddrs_old(sk
, bp
->port
,
4254 addrs
, &bytes_copied
);
4260 list_for_each(pos
, &bp
->address_list
) {
4261 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4262 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4263 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4264 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4265 memcpy(buf
, &temp
, addrlen
);
4267 bytes_copied
+= addrlen
;
4269 if (cnt
>= getaddrs
.addr_num
) break;
4273 sctp_read_unlock(addr_lock
);
4275 /* copy the entire address list into the user provided space */
4276 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4281 /* copy the leading structure back to user */
4282 getaddrs
.addr_num
= cnt
;
4283 if (copy_to_user(optval
, &getaddrs
, len
))
4291 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4292 char __user
*optval
, int __user
*optlen
)
4294 struct sctp_bind_addr
*bp
;
4295 struct sctp_association
*asoc
;
4296 struct list_head
*pos
;
4298 struct sctp_getaddrs getaddrs
;
4299 struct sctp_sockaddr_entry
*addr
;
4301 union sctp_addr temp
;
4302 struct sctp_sock
*sp
= sctp_sk(sk
);
4304 rwlock_t
*addr_lock
;
4307 int bytes_copied
= 0;
4311 if (len
< sizeof(struct sctp_getaddrs
))
4314 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4318 * For UDP-style sockets, id specifies the association to query.
4319 * If the id field is set to the value '0' then the locally bound
4320 * addresses are returned without regard to any particular
4323 if (0 == getaddrs
.assoc_id
) {
4324 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4325 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4327 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4330 bp
= &asoc
->base
.bind_addr
;
4331 addr_lock
= &asoc
->base
.addr_lock
;
4334 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4335 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4337 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4341 sctp_read_lock(addr_lock
);
4343 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4344 * addresses from the global local address list.
4346 if (sctp_list_single_entry(&bp
->address_list
)) {
4347 addr
= list_entry(bp
->address_list
.next
,
4348 struct sctp_sockaddr_entry
, list
);
4349 if (sctp_is_any(&addr
->a
)) {
4350 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4351 space_left
, &bytes_copied
);
4361 list_for_each(pos
, &bp
->address_list
) {
4362 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4363 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4364 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4365 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4366 if (space_left
< addrlen
) {
4367 err
= -ENOMEM
; /*fixme: right error?*/
4370 memcpy(buf
, &temp
, addrlen
);
4372 bytes_copied
+= addrlen
;
4374 space_left
-= addrlen
;
4378 sctp_read_unlock(addr_lock
);
4380 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4384 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4388 if (put_user(bytes_copied
, optlen
))
4395 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4397 * Requests that the local SCTP stack use the enclosed peer address as
4398 * the association primary. The enclosed address must be one of the
4399 * association peer's addresses.
4401 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4402 char __user
*optval
, int __user
*optlen
)
4404 struct sctp_prim prim
;
4405 struct sctp_association
*asoc
;
4406 struct sctp_sock
*sp
= sctp_sk(sk
);
4408 if (len
< sizeof(struct sctp_prim
))
4411 len
= sizeof(struct sctp_prim
);
4413 if (copy_from_user(&prim
, optval
, len
))
4416 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4420 if (!asoc
->peer
.primary_path
)
4423 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4424 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4426 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4427 (union sctp_addr
*)&prim
.ssp_addr
);
4429 if (put_user(len
, optlen
))
4431 if (copy_to_user(optval
, &prim
, len
))
4438 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4440 * Requests that the local endpoint set the specified Adaptation Layer
4441 * Indication parameter for all future INIT and INIT-ACK exchanges.
4443 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4444 char __user
*optval
, int __user
*optlen
)
4446 struct sctp_setadaptation adaptation
;
4448 if (len
< sizeof(struct sctp_setadaptation
))
4451 len
= sizeof(struct sctp_setadaptation
);
4453 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4455 if (put_user(len
, optlen
))
4457 if (copy_to_user(optval
, &adaptation
, len
))
4465 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4467 * Applications that wish to use the sendto() system call may wish to
4468 * specify a default set of parameters that would normally be supplied
4469 * through the inclusion of ancillary data. This socket option allows
4470 * such an application to set the default sctp_sndrcvinfo structure.
4473 * The application that wishes to use this socket option simply passes
4474 * in to this call the sctp_sndrcvinfo structure defined in Section
4475 * 5.2.2) The input parameters accepted by this call include
4476 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4477 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4478 * to this call if the caller is using the UDP model.
4480 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4482 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4483 int len
, char __user
*optval
,
4486 struct sctp_sndrcvinfo info
;
4487 struct sctp_association
*asoc
;
4488 struct sctp_sock
*sp
= sctp_sk(sk
);
4490 if (len
< sizeof(struct sctp_sndrcvinfo
))
4493 len
= sizeof(struct sctp_sndrcvinfo
);
4495 if (copy_from_user(&info
, optval
, len
))
4498 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4499 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4503 info
.sinfo_stream
= asoc
->default_stream
;
4504 info
.sinfo_flags
= asoc
->default_flags
;
4505 info
.sinfo_ppid
= asoc
->default_ppid
;
4506 info
.sinfo_context
= asoc
->default_context
;
4507 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4509 info
.sinfo_stream
= sp
->default_stream
;
4510 info
.sinfo_flags
= sp
->default_flags
;
4511 info
.sinfo_ppid
= sp
->default_ppid
;
4512 info
.sinfo_context
= sp
->default_context
;
4513 info
.sinfo_timetolive
= sp
->default_timetolive
;
4516 if (put_user(len
, optlen
))
4518 if (copy_to_user(optval
, &info
, len
))
4526 * 7.1.5 SCTP_NODELAY
4528 * Turn on/off any Nagle-like algorithm. This means that packets are
4529 * generally sent as soon as possible and no unnecessary delays are
4530 * introduced, at the cost of more packets in the network. Expects an
4531 * integer boolean flag.
4534 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4535 char __user
*optval
, int __user
*optlen
)
4539 if (len
< sizeof(int))
4543 val
= (sctp_sk(sk
)->nodelay
== 1);
4544 if (put_user(len
, optlen
))
4546 if (copy_to_user(optval
, &val
, len
))
4553 * 7.1.1 SCTP_RTOINFO
4555 * The protocol parameters used to initialize and bound retransmission
4556 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4557 * and modify these parameters.
4558 * All parameters are time values, in milliseconds. A value of 0, when
4559 * modifying the parameters, indicates that the current value should not
4563 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4564 char __user
*optval
,
4565 int __user
*optlen
) {
4566 struct sctp_rtoinfo rtoinfo
;
4567 struct sctp_association
*asoc
;
4569 if (len
< sizeof (struct sctp_rtoinfo
))
4572 len
= sizeof(struct sctp_rtoinfo
);
4574 if (copy_from_user(&rtoinfo
, optval
, len
))
4577 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4579 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4582 /* Values corresponding to the specific association. */
4584 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4585 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4586 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4588 /* Values corresponding to the endpoint. */
4589 struct sctp_sock
*sp
= sctp_sk(sk
);
4591 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4592 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4593 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4596 if (put_user(len
, optlen
))
4599 if (copy_to_user(optval
, &rtoinfo
, len
))
4607 * 7.1.2 SCTP_ASSOCINFO
4609 * This option is used to tune the maximum retransmission attempts
4610 * of the association.
4611 * Returns an error if the new association retransmission value is
4612 * greater than the sum of the retransmission value of the peer.
4613 * See [SCTP] for more information.
4616 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4617 char __user
*optval
,
4621 struct sctp_assocparams assocparams
;
4622 struct sctp_association
*asoc
;
4623 struct list_head
*pos
;
4626 if (len
< sizeof (struct sctp_assocparams
))
4629 len
= sizeof(struct sctp_assocparams
);
4631 if (copy_from_user(&assocparams
, optval
, len
))
4634 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4636 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4639 /* Values correspoinding to the specific association */
4641 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4642 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4643 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4644 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4646 (asoc
->cookie_life
.tv_usec
4649 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4653 assocparams
.sasoc_number_peer_destinations
= cnt
;
4655 /* Values corresponding to the endpoint */
4656 struct sctp_sock
*sp
= sctp_sk(sk
);
4658 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4659 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4660 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4661 assocparams
.sasoc_cookie_life
=
4662 sp
->assocparams
.sasoc_cookie_life
;
4663 assocparams
.sasoc_number_peer_destinations
=
4665 sasoc_number_peer_destinations
;
4668 if (put_user(len
, optlen
))
4671 if (copy_to_user(optval
, &assocparams
, len
))
4678 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4680 * This socket option is a boolean flag which turns on or off mapped V4
4681 * addresses. If this option is turned on and the socket is type
4682 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4683 * If this option is turned off, then no mapping will be done of V4
4684 * addresses and a user will receive both PF_INET6 and PF_INET type
4685 * addresses on the socket.
4687 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
4688 char __user
*optval
, int __user
*optlen
)
4691 struct sctp_sock
*sp
= sctp_sk(sk
);
4693 if (len
< sizeof(int))
4698 if (put_user(len
, optlen
))
4700 if (copy_to_user(optval
, &val
, len
))
4707 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
4708 * (chapter and verse is quoted at sctp_setsockopt_context())
4710 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
4711 char __user
*optval
, int __user
*optlen
)
4713 struct sctp_assoc_value params
;
4714 struct sctp_sock
*sp
;
4715 struct sctp_association
*asoc
;
4717 if (len
< sizeof(struct sctp_assoc_value
))
4720 len
= sizeof(struct sctp_assoc_value
);
4722 if (copy_from_user(¶ms
, optval
, len
))
4727 if (params
.assoc_id
!= 0) {
4728 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4731 params
.assoc_value
= asoc
->default_rcv_context
;
4733 params
.assoc_value
= sp
->default_rcv_context
;
4736 if (put_user(len
, optlen
))
4738 if (copy_to_user(optval
, ¶ms
, len
))
4745 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
4747 * This socket option specifies the maximum size to put in any outgoing
4748 * SCTP chunk. If a message is larger than this size it will be
4749 * fragmented by SCTP into the specified size. Note that the underlying
4750 * SCTP implementation may fragment into smaller sized chunks when the
4751 * PMTU of the underlying association is smaller than the value set by
4754 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
4755 char __user
*optval
, int __user
*optlen
)
4759 if (len
< sizeof(int))
4764 val
= sctp_sk(sk
)->user_frag
;
4765 if (put_user(len
, optlen
))
4767 if (copy_to_user(optval
, &val
, len
))
4774 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
4775 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
4777 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
4778 char __user
*optval
, int __user
*optlen
)
4782 if (len
< sizeof(int))
4787 val
= sctp_sk(sk
)->frag_interleave
;
4788 if (put_user(len
, optlen
))
4790 if (copy_to_user(optval
, &val
, len
))
4797 * 7.1.25. Set or Get the sctp partial delivery point
4798 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
4800 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
4801 char __user
*optval
,
4806 if (len
< sizeof(u32
))
4811 val
= sctp_sk(sk
)->pd_point
;
4812 if (put_user(len
, optlen
))
4814 if (copy_to_user(optval
, &val
, len
))
4821 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
4822 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
4824 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
4825 char __user
*optval
,
4830 if (len
< sizeof(int))
4835 val
= sctp_sk(sk
)->max_burst
;
4836 if (put_user(len
, optlen
))
4838 if (copy_to_user(optval
, &val
, len
))
4844 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
4845 char __user
*optval
, int __user
*optlen
)
4850 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
4853 /* I can hardly begin to describe how wrong this is. This is
4854 * so broken as to be worse than useless. The API draft
4855 * REALLY is NOT helpful here... I am not convinced that the
4856 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
4857 * are at all well-founded.
4859 if (level
!= SOL_SCTP
) {
4860 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
4862 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
4866 if (get_user(len
, optlen
))
4873 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
4875 case SCTP_DISABLE_FRAGMENTS
:
4876 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
4880 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
4882 case SCTP_AUTOCLOSE
:
4883 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
4885 case SCTP_SOCKOPT_PEELOFF
:
4886 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
4888 case SCTP_PEER_ADDR_PARAMS
:
4889 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
4892 case SCTP_DELAYED_ACK_TIME
:
4893 retval
= sctp_getsockopt_delayed_ack_time(sk
, len
, optval
,
4897 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
4899 case SCTP_GET_PEER_ADDRS_NUM_OLD
:
4900 retval
= sctp_getsockopt_peer_addrs_num_old(sk
, len
, optval
,
4903 case SCTP_GET_LOCAL_ADDRS_NUM_OLD
:
4904 retval
= sctp_getsockopt_local_addrs_num_old(sk
, len
, optval
,
4907 case SCTP_GET_PEER_ADDRS_OLD
:
4908 retval
= sctp_getsockopt_peer_addrs_old(sk
, len
, optval
,
4911 case SCTP_GET_LOCAL_ADDRS_OLD
:
4912 retval
= sctp_getsockopt_local_addrs_old(sk
, len
, optval
,
4915 case SCTP_GET_PEER_ADDRS
:
4916 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
4919 case SCTP_GET_LOCAL_ADDRS
:
4920 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
4923 case SCTP_DEFAULT_SEND_PARAM
:
4924 retval
= sctp_getsockopt_default_send_param(sk
, len
,
4927 case SCTP_PRIMARY_ADDR
:
4928 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
4931 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
4934 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
4936 case SCTP_ASSOCINFO
:
4937 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
4939 case SCTP_I_WANT_MAPPED_V4_ADDR
:
4940 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
4943 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
4945 case SCTP_GET_PEER_ADDR_INFO
:
4946 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
4949 case SCTP_ADAPTATION_LAYER
:
4950 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
4954 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
4956 case SCTP_FRAGMENT_INTERLEAVE
:
4957 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
4960 case SCTP_PARTIAL_DELIVERY_POINT
:
4961 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
4964 case SCTP_MAX_BURST
:
4965 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
4968 retval
= -ENOPROTOOPT
;
4972 sctp_release_sock(sk
);
4976 static void sctp_hash(struct sock
*sk
)
4981 static void sctp_unhash(struct sock
*sk
)
4986 /* Check if port is acceptable. Possibly find first available port.
4988 * The port hash table (contained in the 'global' SCTP protocol storage
4989 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
4990 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
4991 * list (the list number is the port number hashed out, so as you
4992 * would expect from a hash function, all the ports in a given list have
4993 * such a number that hashes out to the same list number; you were
4994 * expecting that, right?); so each list has a set of ports, with a
4995 * link to the socket (struct sock) that uses it, the port number and
4996 * a fastreuse flag (FIXME: NPI ipg).
4998 static struct sctp_bind_bucket
*sctp_bucket_create(
4999 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
5001 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
5003 struct sctp_bind_hashbucket
*head
; /* hash list */
5004 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5005 unsigned short snum
;
5008 snum
= ntohs(addr
->v4
.sin_port
);
5010 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
5011 sctp_local_bh_disable();
5014 /* Search for an available port.
5016 * 'sctp_port_rover' was the last port assigned, so
5017 * we start to search from 'sctp_port_rover +
5018 * 1'. What we do is first check if port 'rover' is
5019 * already in the hash table; if not, we use that; if
5020 * it is, we try next.
5022 int low
= sysctl_local_port_range
[0];
5023 int high
= sysctl_local_port_range
[1];
5024 int remaining
= (high
- low
) + 1;
5028 sctp_spin_lock(&sctp_port_alloc_lock
);
5029 rover
= sctp_port_rover
;
5032 if ((rover
< low
) || (rover
> high
))
5034 index
= sctp_phashfn(rover
);
5035 head
= &sctp_port_hashtable
[index
];
5036 sctp_spin_lock(&head
->lock
);
5037 for (pp
= head
->chain
; pp
; pp
= pp
->next
)
5038 if (pp
->port
== rover
)
5042 sctp_spin_unlock(&head
->lock
);
5043 } while (--remaining
> 0);
5044 sctp_port_rover
= rover
;
5045 sctp_spin_unlock(&sctp_port_alloc_lock
);
5047 /* Exhausted local port range during search? */
5052 /* OK, here is the one we will use. HEAD (the port
5053 * hash table list entry) is non-NULL and we hold it's
5058 /* We are given an specific port number; we verify
5059 * that it is not being used. If it is used, we will
5060 * exahust the search in the hash list corresponding
5061 * to the port number (snum) - we detect that with the
5062 * port iterator, pp being NULL.
5064 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
5065 sctp_spin_lock(&head
->lock
);
5066 for (pp
= head
->chain
; pp
; pp
= pp
->next
) {
5067 if (pp
->port
== snum
)
5074 if (!hlist_empty(&pp
->owner
)) {
5075 /* We had a port hash table hit - there is an
5076 * available port (pp != NULL) and it is being
5077 * used by other socket (pp->owner not empty); that other
5078 * socket is going to be sk2.
5080 int reuse
= sk
->sk_reuse
;
5082 struct hlist_node
*node
;
5084 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5085 if (pp
->fastreuse
&& sk
->sk_reuse
&&
5086 sk
->sk_state
!= SCTP_SS_LISTENING
)
5089 /* Run through the list of sockets bound to the port
5090 * (pp->port) [via the pointers bind_next and
5091 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5092 * we get the endpoint they describe and run through
5093 * the endpoint's list of IP (v4 or v6) addresses,
5094 * comparing each of the addresses with the address of
5095 * the socket sk. If we find a match, then that means
5096 * that this port/socket (sk) combination are already
5099 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
5100 struct sctp_endpoint
*ep2
;
5101 ep2
= sctp_sk(sk2
)->ep
;
5103 if (reuse
&& sk2
->sk_reuse
&&
5104 sk2
->sk_state
!= SCTP_SS_LISTENING
)
5107 if (sctp_bind_addr_match(&ep2
->base
.bind_addr
, addr
,
5113 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5116 /* If there was a hash table miss, create a new port. */
5118 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
5121 /* In either case (hit or miss), make sure fastreuse is 1 only
5122 * if sk->sk_reuse is too (that is, if the caller requested
5123 * SO_REUSEADDR on this socket -sk-).
5125 if (hlist_empty(&pp
->owner
)) {
5126 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
5130 } else if (pp
->fastreuse
&&
5131 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
5134 /* We are set, so fill up all the data in the hash table
5135 * entry, tie the socket list information with the rest of the
5136 * sockets FIXME: Blurry, NPI (ipg).
5139 if (!sctp_sk(sk
)->bind_hash
) {
5140 inet_sk(sk
)->num
= snum
;
5141 sk_add_bind_node(sk
, &pp
->owner
);
5142 sctp_sk(sk
)->bind_hash
= pp
;
5147 sctp_spin_unlock(&head
->lock
);
5150 sctp_local_bh_enable();
5154 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5155 * port is requested.
5157 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
5160 union sctp_addr addr
;
5161 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5163 /* Set up a dummy address struct from the sk. */
5164 af
->from_sk(&addr
, sk
);
5165 addr
.v4
.sin_port
= htons(snum
);
5167 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5168 ret
= sctp_get_port_local(sk
, &addr
);
5170 return (ret
? 1 : 0);
5174 * 3.1.3 listen() - UDP Style Syntax
5176 * By default, new associations are not accepted for UDP style sockets.
5177 * An application uses listen() to mark a socket as being able to
5178 * accept new associations.
5180 SCTP_STATIC
int sctp_seqpacket_listen(struct sock
*sk
, int backlog
)
5182 struct sctp_sock
*sp
= sctp_sk(sk
);
5183 struct sctp_endpoint
*ep
= sp
->ep
;
5185 /* Only UDP style sockets that are not peeled off are allowed to
5188 if (!sctp_style(sk
, UDP
))
5191 /* If backlog is zero, disable listening. */
5193 if (sctp_sstate(sk
, CLOSED
))
5196 sctp_unhash_endpoint(ep
);
5197 sk
->sk_state
= SCTP_SS_CLOSED
;
5200 /* Return if we are already listening. */
5201 if (sctp_sstate(sk
, LISTENING
))
5205 * If a bind() or sctp_bindx() is not called prior to a listen()
5206 * call that allows new associations to be accepted, the system
5207 * picks an ephemeral port and will choose an address set equivalent
5208 * to binding with a wildcard address.
5210 * This is not currently spelled out in the SCTP sockets
5211 * extensions draft, but follows the practice as seen in TCP
5214 * Additionally, turn off fastreuse flag since we are not listening
5216 sk
->sk_state
= SCTP_SS_LISTENING
;
5217 if (!ep
->base
.bind_addr
.port
) {
5218 if (sctp_autobind(sk
))
5221 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5223 sctp_hash_endpoint(ep
);
5228 * 4.1.3 listen() - TCP Style Syntax
5230 * Applications uses listen() to ready the SCTP endpoint for accepting
5231 * inbound associations.
5233 SCTP_STATIC
int sctp_stream_listen(struct sock
*sk
, int backlog
)
5235 struct sctp_sock
*sp
= sctp_sk(sk
);
5236 struct sctp_endpoint
*ep
= sp
->ep
;
5238 /* If backlog is zero, disable listening. */
5240 if (sctp_sstate(sk
, CLOSED
))
5243 sctp_unhash_endpoint(ep
);
5244 sk
->sk_state
= SCTP_SS_CLOSED
;
5247 if (sctp_sstate(sk
, LISTENING
))
5251 * If a bind() or sctp_bindx() is not called prior to a listen()
5252 * call that allows new associations to be accepted, the system
5253 * picks an ephemeral port and will choose an address set equivalent
5254 * to binding with a wildcard address.
5256 * This is not currently spelled out in the SCTP sockets
5257 * extensions draft, but follows the practice as seen in TCP
5260 sk
->sk_state
= SCTP_SS_LISTENING
;
5261 if (!ep
->base
.bind_addr
.port
) {
5262 if (sctp_autobind(sk
))
5265 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5267 sk
->sk_max_ack_backlog
= backlog
;
5268 sctp_hash_endpoint(ep
);
5273 * Move a socket to LISTENING state.
5275 int sctp_inet_listen(struct socket
*sock
, int backlog
)
5277 struct sock
*sk
= sock
->sk
;
5278 struct crypto_hash
*tfm
= NULL
;
5281 if (unlikely(backlog
< 0))
5286 if (sock
->state
!= SS_UNCONNECTED
)
5289 /* Allocate HMAC for generating cookie. */
5290 if (sctp_hmac_alg
) {
5291 tfm
= crypto_alloc_hash(sctp_hmac_alg
, 0, CRYPTO_ALG_ASYNC
);
5293 if (net_ratelimit()) {
5295 "SCTP: failed to load transform for %s: %ld\n",
5296 sctp_hmac_alg
, PTR_ERR(tfm
));
5303 switch (sock
->type
) {
5304 case SOCK_SEQPACKET
:
5305 err
= sctp_seqpacket_listen(sk
, backlog
);
5308 err
= sctp_stream_listen(sk
, backlog
);
5317 /* Store away the transform reference. */
5318 sctp_sk(sk
)->hmac
= tfm
;
5320 sctp_release_sock(sk
);
5323 crypto_free_hash(tfm
);
5328 * This function is done by modeling the current datagram_poll() and the
5329 * tcp_poll(). Note that, based on these implementations, we don't
5330 * lock the socket in this function, even though it seems that,
5331 * ideally, locking or some other mechanisms can be used to ensure
5332 * the integrity of the counters (sndbuf and wmem_alloc) used
5333 * in this place. We assume that we don't need locks either until proven
5336 * Another thing to note is that we include the Async I/O support
5337 * here, again, by modeling the current TCP/UDP code. We don't have
5338 * a good way to test with it yet.
5340 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
5342 struct sock
*sk
= sock
->sk
;
5343 struct sctp_sock
*sp
= sctp_sk(sk
);
5346 poll_wait(file
, sk
->sk_sleep
, wait
);
5348 /* A TCP-style listening socket becomes readable when the accept queue
5351 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
5352 return (!list_empty(&sp
->ep
->asocs
)) ?
5353 (POLLIN
| POLLRDNORM
) : 0;
5357 /* Is there any exceptional events? */
5358 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
5360 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5362 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
5365 /* Is it readable? Reconsider this code with TCP-style support. */
5366 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
5367 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
5368 mask
|= POLLIN
| POLLRDNORM
;
5370 /* The association is either gone or not ready. */
5371 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
5374 /* Is it writable? */
5375 if (sctp_writeable(sk
)) {
5376 mask
|= POLLOUT
| POLLWRNORM
;
5378 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
5380 * Since the socket is not locked, the buffer
5381 * might be made available after the writeable check and
5382 * before the bit is set. This could cause a lost I/O
5383 * signal. tcp_poll() has a race breaker for this race
5384 * condition. Based on their implementation, we put
5385 * in the following code to cover it as well.
5387 if (sctp_writeable(sk
))
5388 mask
|= POLLOUT
| POLLWRNORM
;
5393 /********************************************************************
5394 * 2nd Level Abstractions
5395 ********************************************************************/
5397 static struct sctp_bind_bucket
*sctp_bucket_create(
5398 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
5400 struct sctp_bind_bucket
*pp
;
5402 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
5403 SCTP_DBG_OBJCNT_INC(bind_bucket
);
5407 INIT_HLIST_HEAD(&pp
->owner
);
5408 if ((pp
->next
= head
->chain
) != NULL
)
5409 pp
->next
->pprev
= &pp
->next
;
5411 pp
->pprev
= &head
->chain
;
5416 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5417 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
5419 if (pp
&& hlist_empty(&pp
->owner
)) {
5421 pp
->next
->pprev
= pp
->pprev
;
5422 *(pp
->pprev
) = pp
->next
;
5423 kmem_cache_free(sctp_bucket_cachep
, pp
);
5424 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
5428 /* Release this socket's reference to a local port. */
5429 static inline void __sctp_put_port(struct sock
*sk
)
5431 struct sctp_bind_hashbucket
*head
=
5432 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->num
)];
5433 struct sctp_bind_bucket
*pp
;
5435 sctp_spin_lock(&head
->lock
);
5436 pp
= sctp_sk(sk
)->bind_hash
;
5437 __sk_del_bind_node(sk
);
5438 sctp_sk(sk
)->bind_hash
= NULL
;
5439 inet_sk(sk
)->num
= 0;
5440 sctp_bucket_destroy(pp
);
5441 sctp_spin_unlock(&head
->lock
);
5444 void sctp_put_port(struct sock
*sk
)
5446 sctp_local_bh_disable();
5447 __sctp_put_port(sk
);
5448 sctp_local_bh_enable();
5452 * The system picks an ephemeral port and choose an address set equivalent
5453 * to binding with a wildcard address.
5454 * One of those addresses will be the primary address for the association.
5455 * This automatically enables the multihoming capability of SCTP.
5457 static int sctp_autobind(struct sock
*sk
)
5459 union sctp_addr autoaddr
;
5463 /* Initialize a local sockaddr structure to INADDR_ANY. */
5464 af
= sctp_sk(sk
)->pf
->af
;
5466 port
= htons(inet_sk(sk
)->num
);
5467 af
->inaddr_any(&autoaddr
, port
);
5469 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5472 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5475 * 4.2 The cmsghdr Structure *
5477 * When ancillary data is sent or received, any number of ancillary data
5478 * objects can be specified by the msg_control and msg_controllen members of
5479 * the msghdr structure, because each object is preceded by
5480 * a cmsghdr structure defining the object's length (the cmsg_len member).
5481 * Historically Berkeley-derived implementations have passed only one object
5482 * at a time, but this API allows multiple objects to be
5483 * passed in a single call to sendmsg() or recvmsg(). The following example
5484 * shows two ancillary data objects in a control buffer.
5486 * |<--------------------------- msg_controllen -------------------------->|
5489 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5491 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5494 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5496 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5499 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5500 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5502 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5504 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5511 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
5512 sctp_cmsgs_t
*cmsgs
)
5514 struct cmsghdr
*cmsg
;
5516 for (cmsg
= CMSG_FIRSTHDR(msg
);
5518 cmsg
= CMSG_NXTHDR((struct msghdr
*)msg
, cmsg
)) {
5519 if (!CMSG_OK(msg
, cmsg
))
5522 /* Should we parse this header or ignore? */
5523 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
5526 /* Strictly check lengths following example in SCM code. */
5527 switch (cmsg
->cmsg_type
) {
5529 /* SCTP Socket API Extension
5530 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5532 * This cmsghdr structure provides information for
5533 * initializing new SCTP associations with sendmsg().
5534 * The SCTP_INITMSG socket option uses this same data
5535 * structure. This structure is not used for
5538 * cmsg_level cmsg_type cmsg_data[]
5539 * ------------ ------------ ----------------------
5540 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5542 if (cmsg
->cmsg_len
!=
5543 CMSG_LEN(sizeof(struct sctp_initmsg
)))
5545 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
5549 /* SCTP Socket API Extension
5550 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5552 * This cmsghdr structure specifies SCTP options for
5553 * sendmsg() and describes SCTP header information
5554 * about a received message through recvmsg().
5556 * cmsg_level cmsg_type cmsg_data[]
5557 * ------------ ------------ ----------------------
5558 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5560 if (cmsg
->cmsg_len
!=
5561 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
5565 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
5567 /* Minimally, validate the sinfo_flags. */
5568 if (cmsgs
->info
->sinfo_flags
&
5569 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
5570 SCTP_ABORT
| SCTP_EOF
))
5582 * Wait for a packet..
5583 * Note: This function is the same function as in core/datagram.c
5584 * with a few modifications to make lksctp work.
5586 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
5591 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5593 /* Socket errors? */
5594 error
= sock_error(sk
);
5598 if (!skb_queue_empty(&sk
->sk_receive_queue
))
5601 /* Socket shut down? */
5602 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5605 /* Sequenced packets can come disconnected. If so we report the
5610 /* Is there a good reason to think that we may receive some data? */
5611 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
5614 /* Handle signals. */
5615 if (signal_pending(current
))
5618 /* Let another process have a go. Since we are going to sleep
5619 * anyway. Note: This may cause odd behaviors if the message
5620 * does not fit in the user's buffer, but this seems to be the
5621 * only way to honor MSG_DONTWAIT realistically.
5623 sctp_release_sock(sk
);
5624 *timeo_p
= schedule_timeout(*timeo_p
);
5628 finish_wait(sk
->sk_sleep
, &wait
);
5632 error
= sock_intr_errno(*timeo_p
);
5635 finish_wait(sk
->sk_sleep
, &wait
);
5640 /* Receive a datagram.
5641 * Note: This is pretty much the same routine as in core/datagram.c
5642 * with a few changes to make lksctp work.
5644 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
5645 int noblock
, int *err
)
5648 struct sk_buff
*skb
;
5651 timeo
= sock_rcvtimeo(sk
, noblock
);
5653 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
5654 timeo
, MAX_SCHEDULE_TIMEOUT
);
5657 /* Again only user level code calls this function,
5658 * so nothing interrupt level
5659 * will suddenly eat the receive_queue.
5661 * Look at current nfs client by the way...
5662 * However, this function was corrent in any case. 8)
5664 if (flags
& MSG_PEEK
) {
5665 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
5666 skb
= skb_peek(&sk
->sk_receive_queue
);
5668 atomic_inc(&skb
->users
);
5669 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
5671 skb
= skb_dequeue(&sk
->sk_receive_queue
);
5677 /* Caller is allowed not to check sk->sk_err before calling. */
5678 error
= sock_error(sk
);
5682 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5685 /* User doesn't want to wait. */
5689 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
5698 /* If sndbuf has changed, wake up per association sndbuf waiters. */
5699 static void __sctp_write_space(struct sctp_association
*asoc
)
5701 struct sock
*sk
= asoc
->base
.sk
;
5702 struct socket
*sock
= sk
->sk_socket
;
5704 if ((sctp_wspace(asoc
) > 0) && sock
) {
5705 if (waitqueue_active(&asoc
->wait
))
5706 wake_up_interruptible(&asoc
->wait
);
5708 if (sctp_writeable(sk
)) {
5709 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
5710 wake_up_interruptible(sk
->sk_sleep
);
5712 /* Note that we try to include the Async I/O support
5713 * here by modeling from the current TCP/UDP code.
5714 * We have not tested with it yet.
5716 if (sock
->fasync_list
&&
5717 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
5718 sock_wake_async(sock
, 2, POLL_OUT
);
5723 /* Do accounting for the sndbuf space.
5724 * Decrement the used sndbuf space of the corresponding association by the
5725 * data size which was just transmitted(freed).
5727 static void sctp_wfree(struct sk_buff
*skb
)
5729 struct sctp_association
*asoc
;
5730 struct sctp_chunk
*chunk
;
5733 /* Get the saved chunk pointer. */
5734 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
5737 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
5738 sizeof(struct sk_buff
) +
5739 sizeof(struct sctp_chunk
);
5741 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
5744 __sctp_write_space(asoc
);
5746 sctp_association_put(asoc
);
5749 /* Do accounting for the receive space on the socket.
5750 * Accounting for the association is done in ulpevent.c
5751 * We set this as a destructor for the cloned data skbs so that
5752 * accounting is done at the correct time.
5754 void sctp_sock_rfree(struct sk_buff
*skb
)
5756 struct sock
*sk
= skb
->sk
;
5757 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
5759 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
5763 /* Helper function to wait for space in the sndbuf. */
5764 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
5767 struct sock
*sk
= asoc
->base
.sk
;
5769 long current_timeo
= *timeo_p
;
5772 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
5773 asoc
, (long)(*timeo_p
), msg_len
);
5775 /* Increment the association's refcnt. */
5776 sctp_association_hold(asoc
);
5778 /* Wait on the association specific sndbuf space. */
5780 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
5781 TASK_INTERRUPTIBLE
);
5784 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
5787 if (signal_pending(current
))
5788 goto do_interrupted
;
5789 if (msg_len
<= sctp_wspace(asoc
))
5792 /* Let another process have a go. Since we are going
5795 sctp_release_sock(sk
);
5796 current_timeo
= schedule_timeout(current_timeo
);
5797 BUG_ON(sk
!= asoc
->base
.sk
);
5800 *timeo_p
= current_timeo
;
5804 finish_wait(&asoc
->wait
, &wait
);
5806 /* Release the association's refcnt. */
5807 sctp_association_put(asoc
);
5816 err
= sock_intr_errno(*timeo_p
);
5824 /* If socket sndbuf has changed, wake up all per association waiters. */
5825 void sctp_write_space(struct sock
*sk
)
5827 struct sctp_association
*asoc
;
5828 struct list_head
*pos
;
5830 /* Wake up the tasks in each wait queue. */
5831 list_for_each(pos
, &((sctp_sk(sk
))->ep
->asocs
)) {
5832 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
5833 __sctp_write_space(asoc
);
5837 /* Is there any sndbuf space available on the socket?
5839 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
5840 * associations on the same socket. For a UDP-style socket with
5841 * multiple associations, it is possible for it to be "unwriteable"
5842 * prematurely. I assume that this is acceptable because
5843 * a premature "unwriteable" is better than an accidental "writeable" which
5844 * would cause an unwanted block under certain circumstances. For the 1-1
5845 * UDP-style sockets or TCP-style sockets, this code should work.
5848 static int sctp_writeable(struct sock
*sk
)
5852 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
5858 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
5859 * returns immediately with EINPROGRESS.
5861 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
5863 struct sock
*sk
= asoc
->base
.sk
;
5865 long current_timeo
= *timeo_p
;
5868 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __FUNCTION__
, asoc
,
5871 /* Increment the association's refcnt. */
5872 sctp_association_hold(asoc
);
5875 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
5876 TASK_INTERRUPTIBLE
);
5879 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5881 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
5884 if (signal_pending(current
))
5885 goto do_interrupted
;
5887 if (sctp_state(asoc
, ESTABLISHED
))
5890 /* Let another process have a go. Since we are going
5893 sctp_release_sock(sk
);
5894 current_timeo
= schedule_timeout(current_timeo
);
5897 *timeo_p
= current_timeo
;
5901 finish_wait(&asoc
->wait
, &wait
);
5903 /* Release the association's refcnt. */
5904 sctp_association_put(asoc
);
5909 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
5912 err
= -ECONNREFUSED
;
5916 err
= sock_intr_errno(*timeo_p
);
5924 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
5926 struct sctp_endpoint
*ep
;
5930 ep
= sctp_sk(sk
)->ep
;
5934 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
,
5935 TASK_INTERRUPTIBLE
);
5937 if (list_empty(&ep
->asocs
)) {
5938 sctp_release_sock(sk
);
5939 timeo
= schedule_timeout(timeo
);
5944 if (!sctp_sstate(sk
, LISTENING
))
5948 if (!list_empty(&ep
->asocs
))
5951 err
= sock_intr_errno(timeo
);
5952 if (signal_pending(current
))
5960 finish_wait(sk
->sk_sleep
, &wait
);
5965 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
5970 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5971 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
5973 sctp_release_sock(sk
);
5974 timeout
= schedule_timeout(timeout
);
5976 } while (!signal_pending(current
) && timeout
);
5978 finish_wait(sk
->sk_sleep
, &wait
);
5981 static void sctp_sock_rfree_frag(struct sk_buff
*skb
)
5983 struct sk_buff
*frag
;
5988 /* Don't forget the fragments. */
5989 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
5990 sctp_sock_rfree_frag(frag
);
5993 sctp_sock_rfree(skb
);
5996 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
5998 struct sk_buff
*frag
;
6003 /* Don't forget the fragments. */
6004 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
6005 sctp_skb_set_owner_r_frag(frag
, sk
);
6008 sctp_skb_set_owner_r(skb
, sk
);
6011 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6012 * and its messages to the newsk.
6014 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
6015 struct sctp_association
*assoc
,
6016 sctp_socket_type_t type
)
6018 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
6019 struct sctp_sock
*newsp
= sctp_sk(newsk
);
6020 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
6021 struct sctp_endpoint
*newep
= newsp
->ep
;
6022 struct sk_buff
*skb
, *tmp
;
6023 struct sctp_ulpevent
*event
;
6026 /* Migrate socket buffer sizes and all the socket level options to the
6029 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
6030 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
6031 /* Brute force copy old sctp opt. */
6032 inet_sk_copy_descendant(newsk
, oldsk
);
6034 /* Restore the ep value that was overwritten with the above structure
6040 /* Hook this new socket in to the bind_hash list. */
6041 pp
= sctp_sk(oldsk
)->bind_hash
;
6042 sk_add_bind_node(newsk
, &pp
->owner
);
6043 sctp_sk(newsk
)->bind_hash
= pp
;
6044 inet_sk(newsk
)->num
= inet_sk(oldsk
)->num
;
6046 /* Copy the bind_addr list from the original endpoint to the new
6047 * endpoint so that we can handle restarts properly
6049 if (PF_INET6
== assoc
->base
.sk
->sk_family
)
6050 flags
= SCTP_ADDR6_ALLOWED
;
6051 if (assoc
->peer
.ipv4_address
)
6052 flags
|= SCTP_ADDR4_PEERSUPP
;
6053 if (assoc
->peer
.ipv6_address
)
6054 flags
|= SCTP_ADDR6_PEERSUPP
;
6055 sctp_bind_addr_copy(&newsp
->ep
->base
.bind_addr
,
6056 &oldsp
->ep
->base
.bind_addr
,
6057 SCTP_SCOPE_GLOBAL
, GFP_KERNEL
, flags
);
6059 /* Move any messages in the old socket's receive queue that are for the
6060 * peeled off association to the new socket's receive queue.
6062 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
6063 event
= sctp_skb2event(skb
);
6064 if (event
->asoc
== assoc
) {
6065 sctp_sock_rfree_frag(skb
);
6066 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
6067 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
6068 sctp_skb_set_owner_r_frag(skb
, newsk
);
6072 /* Clean up any messages pending delivery due to partial
6073 * delivery. Three cases:
6074 * 1) No partial deliver; no work.
6075 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6076 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6078 skb_queue_head_init(&newsp
->pd_lobby
);
6079 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
6081 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
6082 struct sk_buff_head
*queue
;
6084 /* Decide which queue to move pd_lobby skbs to. */
6085 if (assoc
->ulpq
.pd_mode
) {
6086 queue
= &newsp
->pd_lobby
;
6088 queue
= &newsk
->sk_receive_queue
;
6090 /* Walk through the pd_lobby, looking for skbs that
6091 * need moved to the new socket.
6093 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6094 event
= sctp_skb2event(skb
);
6095 if (event
->asoc
== assoc
) {
6096 sctp_sock_rfree_frag(skb
);
6097 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6098 __skb_queue_tail(queue
, skb
);
6099 sctp_skb_set_owner_r_frag(skb
, newsk
);
6103 /* Clear up any skbs waiting for the partial
6104 * delivery to finish.
6106 if (assoc
->ulpq
.pd_mode
)
6107 sctp_clear_pd(oldsk
, NULL
);
6111 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
) {
6112 sctp_sock_rfree_frag(skb
);
6113 sctp_skb_set_owner_r_frag(skb
, newsk
);
6116 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
) {
6117 sctp_sock_rfree_frag(skb
);
6118 sctp_skb_set_owner_r_frag(skb
, newsk
);
6121 /* Set the type of socket to indicate that it is peeled off from the
6122 * original UDP-style socket or created with the accept() call on a
6123 * TCP-style socket..
6127 /* Mark the new socket "in-use" by the user so that any packets
6128 * that may arrive on the association after we've moved it are
6129 * queued to the backlog. This prevents a potential race between
6130 * backlog processing on the old socket and new-packet processing
6131 * on the new socket.
6133 * The caller has just allocated newsk so we can guarantee that other
6134 * paths won't try to lock it and then oldsk.
6136 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
6137 sctp_assoc_migrate(assoc
, newsk
);
6139 /* If the association on the newsk is already closed before accept()
6140 * is called, set RCV_SHUTDOWN flag.
6142 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
6143 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
6145 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
6146 sctp_release_sock(newsk
);
6149 /* This proto struct describes the ULP interface for SCTP. */
6150 struct proto sctp_prot
= {
6152 .owner
= THIS_MODULE
,
6153 .close
= sctp_close
,
6154 .connect
= sctp_connect
,
6155 .disconnect
= sctp_disconnect
,
6156 .accept
= sctp_accept
,
6157 .ioctl
= sctp_ioctl
,
6158 .init
= sctp_init_sock
,
6159 .destroy
= sctp_destroy_sock
,
6160 .shutdown
= sctp_shutdown
,
6161 .setsockopt
= sctp_setsockopt
,
6162 .getsockopt
= sctp_getsockopt
,
6163 .sendmsg
= sctp_sendmsg
,
6164 .recvmsg
= sctp_recvmsg
,
6166 .backlog_rcv
= sctp_backlog_rcv
,
6168 .unhash
= sctp_unhash
,
6169 .get_port
= sctp_get_port
,
6170 .obj_size
= sizeof(struct sctp_sock
),
6173 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6174 struct proto sctpv6_prot
= {
6176 .owner
= THIS_MODULE
,
6177 .close
= sctp_close
,
6178 .connect
= sctp_connect
,
6179 .disconnect
= sctp_disconnect
,
6180 .accept
= sctp_accept
,
6181 .ioctl
= sctp_ioctl
,
6182 .init
= sctp_init_sock
,
6183 .destroy
= sctp_destroy_sock
,
6184 .shutdown
= sctp_shutdown
,
6185 .setsockopt
= sctp_setsockopt
,
6186 .getsockopt
= sctp_getsockopt
,
6187 .sendmsg
= sctp_sendmsg
,
6188 .recvmsg
= sctp_recvmsg
,
6190 .backlog_rcv
= sctp_backlog_rcv
,
6192 .unhash
= sctp_unhash
,
6193 .get_port
= sctp_get_port
,
6194 .obj_size
= sizeof(struct sctp6_sock
),
6196 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */