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 addr
->v4
.sin_port
= htons(snum
);
357 if ((ret
= sctp_get_port_local(sk
, addr
))) {
358 if (ret
== (long) sk
) {
359 /* This endpoint has a conflicting address. */
366 /* Refresh ephemeral port. */
368 bp
->port
= inet_sk(sk
)->num
;
370 /* Add the address to the bind address list. */
371 sctp_local_bh_disable();
372 sctp_write_lock(&ep
->base
.addr_lock
);
374 /* Use GFP_ATOMIC since BHs are disabled. */
375 ret
= sctp_add_bind_addr(bp
, addr
, 1, GFP_ATOMIC
);
376 sctp_write_unlock(&ep
->base
.addr_lock
);
377 sctp_local_bh_enable();
379 /* Copy back into socket for getsockname() use. */
381 inet_sk(sk
)->sport
= htons(inet_sk(sk
)->num
);
382 af
->to_sk_saddr(addr
, sk
);
388 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
390 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
391 * at any one time. If a sender, after sending an ASCONF chunk, decides
392 * it needs to transfer another ASCONF Chunk, it MUST wait until the
393 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
394 * subsequent ASCONF. Note this restriction binds each side, so at any
395 * time two ASCONF may be in-transit on any given association (one sent
396 * from each endpoint).
398 static int sctp_send_asconf(struct sctp_association
*asoc
,
399 struct sctp_chunk
*chunk
)
403 /* If there is an outstanding ASCONF chunk, queue it for later
406 if (asoc
->addip_last_asconf
) {
407 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
411 /* Hold the chunk until an ASCONF_ACK is received. */
412 sctp_chunk_hold(chunk
);
413 retval
= sctp_primitive_ASCONF(asoc
, chunk
);
415 sctp_chunk_free(chunk
);
417 asoc
->addip_last_asconf
= chunk
;
423 /* Add a list of addresses as bind addresses to local endpoint or
426 * Basically run through each address specified in the addrs/addrcnt
427 * array/length pair, determine if it is IPv6 or IPv4 and call
428 * sctp_do_bind() on it.
430 * If any of them fails, then the operation will be reversed and the
431 * ones that were added will be removed.
433 * Only sctp_setsockopt_bindx() is supposed to call this function.
435 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
440 struct sockaddr
*sa_addr
;
443 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
447 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
448 /* The list may contain either IPv4 or IPv6 address;
449 * determine the address length for walking thru the list.
451 sa_addr
= (struct sockaddr
*)addr_buf
;
452 af
= sctp_get_af_specific(sa_addr
->sa_family
);
458 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
461 addr_buf
+= af
->sockaddr_len
;
465 /* Failed. Cleanup the ones that have been added */
467 sctp_bindx_rem(sk
, addrs
, cnt
);
475 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
476 * associations that are part of the endpoint indicating that a list of local
477 * addresses are added to the endpoint.
479 * If any of the addresses is already in the bind address list of the
480 * association, we do not send the chunk for that association. But it will not
481 * affect other associations.
483 * Only sctp_setsockopt_bindx() is supposed to call this function.
485 static int sctp_send_asconf_add_ip(struct sock
*sk
,
486 struct sockaddr
*addrs
,
489 struct sctp_sock
*sp
;
490 struct sctp_endpoint
*ep
;
491 struct sctp_association
*asoc
;
492 struct sctp_bind_addr
*bp
;
493 struct sctp_chunk
*chunk
;
494 struct sctp_sockaddr_entry
*laddr
;
495 union sctp_addr
*addr
;
496 union sctp_addr saveaddr
;
499 struct list_head
*pos
;
504 if (!sctp_addip_enable
)
510 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
511 __FUNCTION__
, sk
, addrs
, addrcnt
);
513 list_for_each(pos
, &ep
->asocs
) {
514 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
516 if (!asoc
->peer
.asconf_capable
)
519 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
522 if (!sctp_state(asoc
, ESTABLISHED
))
525 /* Check if any address in the packed array of addresses is
526 * in the bind address list of the association. If so,
527 * do not send the asconf chunk to its peer, but continue with
528 * other associations.
531 for (i
= 0; i
< addrcnt
; i
++) {
532 addr
= (union sctp_addr
*)addr_buf
;
533 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
539 if (sctp_assoc_lookup_laddr(asoc
, addr
))
542 addr_buf
+= af
->sockaddr_len
;
547 /* Use the first address in bind addr list of association as
548 * Address Parameter of ASCONF CHUNK.
550 sctp_read_lock(&asoc
->base
.addr_lock
);
551 bp
= &asoc
->base
.bind_addr
;
552 p
= bp
->address_list
.next
;
553 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
554 sctp_read_unlock(&asoc
->base
.addr_lock
);
556 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
557 addrcnt
, SCTP_PARAM_ADD_IP
);
563 retval
= sctp_send_asconf(asoc
, chunk
);
567 /* Add the new addresses to the bind address list with
568 * use_as_src set to 0.
570 sctp_local_bh_disable();
571 sctp_write_lock(&asoc
->base
.addr_lock
);
573 for (i
= 0; i
< addrcnt
; i
++) {
574 addr
= (union sctp_addr
*)addr_buf
;
575 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
576 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
577 retval
= sctp_add_bind_addr(bp
, &saveaddr
, 0,
579 addr_buf
+= af
->sockaddr_len
;
581 sctp_write_unlock(&asoc
->base
.addr_lock
);
582 sctp_local_bh_enable();
589 /* Remove a list of addresses from bind addresses list. Do not remove the
592 * Basically run through each address specified in the addrs/addrcnt
593 * array/length pair, determine if it is IPv6 or IPv4 and call
594 * sctp_del_bind() on it.
596 * If any of them fails, then the operation will be reversed and the
597 * ones that were removed will be added back.
599 * At least one address has to be left; if only one address is
600 * available, the operation will return -EBUSY.
602 * Only sctp_setsockopt_bindx() is supposed to call this function.
604 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
606 struct sctp_sock
*sp
= sctp_sk(sk
);
607 struct sctp_endpoint
*ep
= sp
->ep
;
609 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
612 union sctp_addr
*sa_addr
;
615 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
619 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
620 /* If the bind address list is empty or if there is only one
621 * bind address, there is nothing more to be removed (we need
622 * at least one address here).
624 if (list_empty(&bp
->address_list
) ||
625 (sctp_list_single_entry(&bp
->address_list
))) {
630 sa_addr
= (union sctp_addr
*)addr_buf
;
631 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
637 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
638 retval
= -EADDRNOTAVAIL
;
642 if (sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
647 /* FIXME - There is probably a need to check if sk->sk_saddr and
648 * sk->sk_rcv_addr are currently set to one of the addresses to
649 * be removed. This is something which needs to be looked into
650 * when we are fixing the outstanding issues with multi-homing
651 * socket routing and failover schemes. Refer to comments in
652 * sctp_do_bind(). -daisy
654 sctp_local_bh_disable();
655 sctp_write_lock(&ep
->base
.addr_lock
);
657 retval
= sctp_del_bind_addr(bp
, sa_addr
);
659 sctp_write_unlock(&ep
->base
.addr_lock
);
660 sctp_local_bh_enable();
662 addr_buf
+= af
->sockaddr_len
;
665 /* Failed. Add the ones that has been removed back */
667 sctp_bindx_add(sk
, addrs
, cnt
);
675 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
676 * the associations that are part of the endpoint indicating that a list of
677 * local addresses are removed from the endpoint.
679 * If any of the addresses is already in the bind address list of the
680 * association, we do not send the chunk for that association. But it will not
681 * affect other associations.
683 * Only sctp_setsockopt_bindx() is supposed to call this function.
685 static int sctp_send_asconf_del_ip(struct sock
*sk
,
686 struct sockaddr
*addrs
,
689 struct sctp_sock
*sp
;
690 struct sctp_endpoint
*ep
;
691 struct sctp_association
*asoc
;
692 struct sctp_transport
*transport
;
693 struct sctp_bind_addr
*bp
;
694 struct sctp_chunk
*chunk
;
695 union sctp_addr
*laddr
;
698 struct list_head
*pos
, *pos1
;
699 struct sctp_sockaddr_entry
*saddr
;
703 if (!sctp_addip_enable
)
709 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
710 __FUNCTION__
, sk
, addrs
, addrcnt
);
712 list_for_each(pos
, &ep
->asocs
) {
713 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
715 if (!asoc
->peer
.asconf_capable
)
718 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
721 if (!sctp_state(asoc
, ESTABLISHED
))
724 /* Check if any address in the packed array of addresses is
725 * not present in the bind address list of the association.
726 * If so, do not send the asconf chunk to its peer, but
727 * continue with other associations.
730 for (i
= 0; i
< addrcnt
; i
++) {
731 laddr
= (union sctp_addr
*)addr_buf
;
732 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
738 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
741 addr_buf
+= af
->sockaddr_len
;
746 /* Find one address in the association's bind address list
747 * that is not in the packed array of addresses. This is to
748 * make sure that we do not delete all the addresses in the
751 sctp_read_lock(&asoc
->base
.addr_lock
);
752 bp
= &asoc
->base
.bind_addr
;
753 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
755 sctp_read_unlock(&asoc
->base
.addr_lock
);
759 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
766 /* Reset use_as_src flag for the addresses in the bind address
767 * list that are to be deleted.
769 sctp_local_bh_disable();
770 sctp_write_lock(&asoc
->base
.addr_lock
);
772 for (i
= 0; i
< addrcnt
; i
++) {
773 laddr
= (union sctp_addr
*)addr_buf
;
774 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
775 list_for_each(pos1
, &bp
->address_list
) {
776 saddr
= list_entry(pos1
,
777 struct sctp_sockaddr_entry
,
779 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
780 saddr
->use_as_src
= 0;
782 addr_buf
+= af
->sockaddr_len
;
784 sctp_write_unlock(&asoc
->base
.addr_lock
);
785 sctp_local_bh_enable();
787 /* Update the route and saddr entries for all the transports
788 * as some of the addresses in the bind address list are
789 * about to be deleted and cannot be used as source addresses.
791 list_for_each(pos1
, &asoc
->peer
.transport_addr_list
) {
792 transport
= list_entry(pos1
, struct sctp_transport
,
794 dst_release(transport
->dst
);
795 sctp_transport_route(transport
, NULL
,
796 sctp_sk(asoc
->base
.sk
));
799 retval
= sctp_send_asconf(asoc
, chunk
);
805 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
808 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
811 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
812 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
815 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
816 * Section 3.1.2 for this usage.
818 * addrs is a pointer to an array of one or more socket addresses. Each
819 * address is contained in its appropriate structure (i.e. struct
820 * sockaddr_in or struct sockaddr_in6) the family of the address type
821 * must be used to distinguish the address length (note that this
822 * representation is termed a "packed array" of addresses). The caller
823 * specifies the number of addresses in the array with addrcnt.
825 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
826 * -1, and sets errno to the appropriate error code.
828 * For SCTP, the port given in each socket address must be the same, or
829 * sctp_bindx() will fail, setting errno to EINVAL.
831 * The flags parameter is formed from the bitwise OR of zero or more of
832 * the following currently defined flags:
834 * SCTP_BINDX_ADD_ADDR
836 * SCTP_BINDX_REM_ADDR
838 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
839 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
840 * addresses from the association. The two flags are mutually exclusive;
841 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
842 * not remove all addresses from an association; sctp_bindx() will
843 * reject such an attempt with EINVAL.
845 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
846 * additional addresses with an endpoint after calling bind(). Or use
847 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
848 * socket is associated with so that no new association accepted will be
849 * associated with those addresses. If the endpoint supports dynamic
850 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
851 * endpoint to send the appropriate message to the peer to change the
852 * peers address lists.
854 * Adding and removing addresses from a connected association is
855 * optional functionality. Implementations that do not support this
856 * functionality should return EOPNOTSUPP.
858 * Basically do nothing but copying the addresses from user to kernel
859 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
860 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
863 * We don't use copy_from_user() for optimization: we first do the
864 * sanity checks (buffer size -fast- and access check-healthy
865 * pointer); if all of those succeed, then we can alloc the memory
866 * (expensive operation) needed to copy the data to kernel. Then we do
867 * the copying without checking the user space area
868 * (__copy_from_user()).
870 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
873 * sk The sk of the socket
874 * addrs The pointer to the addresses in user land
875 * addrssize Size of the addrs buffer
876 * op Operation to perform (add or remove, see the flags of
879 * Returns 0 if ok, <0 errno code on error.
881 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
882 struct sockaddr __user
*addrs
,
883 int addrs_size
, int op
)
885 struct sockaddr
*kaddrs
;
889 struct sockaddr
*sa_addr
;
893 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
894 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
896 if (unlikely(addrs_size
<= 0))
899 /* Check the user passed a healthy pointer. */
900 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
903 /* Alloc space for the address array in kernel memory. */
904 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
905 if (unlikely(!kaddrs
))
908 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
913 /* Walk through the addrs buffer and count the number of addresses. */
915 while (walk_size
< addrs_size
) {
916 sa_addr
= (struct sockaddr
*)addr_buf
;
917 af
= sctp_get_af_specific(sa_addr
->sa_family
);
919 /* If the address family is not supported or if this address
920 * causes the address buffer to overflow return EINVAL.
922 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
927 addr_buf
+= af
->sockaddr_len
;
928 walk_size
+= af
->sockaddr_len
;
933 case SCTP_BINDX_ADD_ADDR
:
934 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
937 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
940 case SCTP_BINDX_REM_ADDR
:
941 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
944 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
958 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
960 * Common routine for handling connect() and sctp_connectx().
961 * Connect will come in with just a single address.
963 static int __sctp_connect(struct sock
* sk
,
964 struct sockaddr
*kaddrs
,
967 struct sctp_sock
*sp
;
968 struct sctp_endpoint
*ep
;
969 struct sctp_association
*asoc
= NULL
;
970 struct sctp_association
*asoc2
;
971 struct sctp_transport
*transport
;
979 union sctp_addr
*sa_addr
= NULL
;
982 unsigned int f_flags
= 0;
987 /* connect() cannot be done on a socket that is already in ESTABLISHED
988 * state - UDP-style peeled off socket or a TCP-style socket that
989 * is already connected.
990 * It cannot be done even on a TCP-style listening socket.
992 if (sctp_sstate(sk
, ESTABLISHED
) ||
993 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
998 /* Walk through the addrs buffer and count the number of addresses. */
1000 while (walk_size
< addrs_size
) {
1001 sa_addr
= (union sctp_addr
*)addr_buf
;
1002 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1003 port
= ntohs(sa_addr
->v4
.sin_port
);
1005 /* If the address family is not supported or if this address
1006 * causes the address buffer to overflow return EINVAL.
1008 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1013 /* Save current address so we can work with it */
1014 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1016 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1020 /* Make sure the destination port is correctly set
1023 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
)
1027 /* Check if there already is a matching association on the
1028 * endpoint (other than the one created here).
1030 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1031 if (asoc2
&& asoc2
!= asoc
) {
1032 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1039 /* If we could not find a matching association on the endpoint,
1040 * make sure that there is no peeled-off association matching
1041 * the peer address even on another socket.
1043 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1044 err
= -EADDRNOTAVAIL
;
1049 /* If a bind() or sctp_bindx() is not called prior to
1050 * an sctp_connectx() call, the system picks an
1051 * ephemeral port and will choose an address set
1052 * equivalent to binding with a wildcard address.
1054 if (!ep
->base
.bind_addr
.port
) {
1055 if (sctp_autobind(sk
)) {
1061 * If an unprivileged user inherits a 1-many
1062 * style socket with open associations on a
1063 * privileged port, it MAY be permitted to
1064 * accept new associations, but it SHOULD NOT
1065 * be permitted to open new associations.
1067 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1068 !capable(CAP_NET_BIND_SERVICE
)) {
1074 scope
= sctp_scope(&to
);
1075 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1082 /* Prime the peer's transport structures. */
1083 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1091 addr_buf
+= af
->sockaddr_len
;
1092 walk_size
+= af
->sockaddr_len
;
1095 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1100 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1105 /* Initialize sk's dport and daddr for getpeername() */
1106 inet_sk(sk
)->dport
= htons(asoc
->peer
.port
);
1107 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1108 af
->to_sk_daddr(sa_addr
, sk
);
1111 /* in-kernel sockets don't generally have a file allocated to them
1112 * if all they do is call sock_create_kern().
1114 if (sk
->sk_socket
->file
)
1115 f_flags
= sk
->sk_socket
->file
->f_flags
;
1117 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1119 err
= sctp_wait_for_connect(asoc
, &timeo
);
1121 /* Don't free association on exit. */
1126 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1127 " kaddrs: %p err: %d\n",
1130 sctp_association_free(asoc
);
1134 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1137 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
1139 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1140 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1141 * or IPv6 addresses.
1143 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1144 * Section 3.1.2 for this usage.
1146 * addrs is a pointer to an array of one or more socket addresses. Each
1147 * address is contained in its appropriate structure (i.e. struct
1148 * sockaddr_in or struct sockaddr_in6) the family of the address type
1149 * must be used to distengish the address length (note that this
1150 * representation is termed a "packed array" of addresses). The caller
1151 * specifies the number of addresses in the array with addrcnt.
1153 * On success, sctp_connectx() returns 0. On failure, sctp_connectx() returns
1154 * -1, and sets errno to the appropriate error code.
1156 * For SCTP, the port given in each socket address must be the same, or
1157 * sctp_connectx() will fail, setting errno to EINVAL.
1159 * An application can use sctp_connectx to initiate an association with
1160 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1161 * allows a caller to specify multiple addresses at which a peer can be
1162 * reached. The way the SCTP stack uses the list of addresses to set up
1163 * the association is implementation dependant. This function only
1164 * specifies that the stack will try to make use of all the addresses in
1165 * the list when needed.
1167 * Note that the list of addresses passed in is only used for setting up
1168 * the association. It does not necessarily equal the set of addresses
1169 * the peer uses for the resulting association. If the caller wants to
1170 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1171 * retrieve them after the association has been set up.
1173 * Basically do nothing but copying the addresses from user to kernel
1174 * land and invoking either sctp_connectx(). This is used for tunneling
1175 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1177 * We don't use copy_from_user() for optimization: we first do the
1178 * sanity checks (buffer size -fast- and access check-healthy
1179 * pointer); if all of those succeed, then we can alloc the memory
1180 * (expensive operation) needed to copy the data to kernel. Then we do
1181 * the copying without checking the user space area
1182 * (__copy_from_user()).
1184 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1187 * sk The sk of the socket
1188 * addrs The pointer to the addresses in user land
1189 * addrssize Size of the addrs buffer
1191 * Returns 0 if ok, <0 errno code on error.
1193 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1194 struct sockaddr __user
*addrs
,
1198 struct sockaddr
*kaddrs
;
1200 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1201 __FUNCTION__
, sk
, addrs
, addrs_size
);
1203 if (unlikely(addrs_size
<= 0))
1206 /* Check the user passed a healthy pointer. */
1207 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1210 /* Alloc space for the address array in kernel memory. */
1211 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1212 if (unlikely(!kaddrs
))
1215 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1218 err
= __sctp_connect(sk
, kaddrs
, addrs_size
);
1225 /* API 3.1.4 close() - UDP Style Syntax
1226 * Applications use close() to perform graceful shutdown (as described in
1227 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1228 * by a UDP-style socket.
1232 * ret = close(int sd);
1234 * sd - the socket descriptor of the associations to be closed.
1236 * To gracefully shutdown a specific association represented by the
1237 * UDP-style socket, an application should use the sendmsg() call,
1238 * passing no user data, but including the appropriate flag in the
1239 * ancillary data (see Section xxxx).
1241 * If sd in the close() call is a branched-off socket representing only
1242 * one association, the shutdown is performed on that association only.
1244 * 4.1.6 close() - TCP Style Syntax
1246 * Applications use close() to gracefully close down an association.
1250 * int close(int sd);
1252 * sd - the socket descriptor of the association to be closed.
1254 * After an application calls close() on a socket descriptor, no further
1255 * socket operations will succeed on that descriptor.
1257 * API 7.1.4 SO_LINGER
1259 * An application using the TCP-style socket can use this option to
1260 * perform the SCTP ABORT primitive. The linger option structure is:
1263 * int l_onoff; // option on/off
1264 * int l_linger; // linger time
1267 * To enable the option, set l_onoff to 1. If the l_linger value is set
1268 * to 0, calling close() is the same as the ABORT primitive. If the
1269 * value is set to a negative value, the setsockopt() call will return
1270 * an error. If the value is set to a positive value linger_time, the
1271 * close() can be blocked for at most linger_time ms. If the graceful
1272 * shutdown phase does not finish during this period, close() will
1273 * return but the graceful shutdown phase continues in the system.
1275 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1277 struct sctp_endpoint
*ep
;
1278 struct sctp_association
*asoc
;
1279 struct list_head
*pos
, *temp
;
1281 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1284 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1286 ep
= sctp_sk(sk
)->ep
;
1288 /* Walk all associations on an endpoint. */
1289 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1290 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1292 if (sctp_style(sk
, TCP
)) {
1293 /* A closed association can still be in the list if
1294 * it belongs to a TCP-style listening socket that is
1295 * not yet accepted. If so, free it. If not, send an
1296 * ABORT or SHUTDOWN based on the linger options.
1298 if (sctp_state(asoc
, CLOSED
)) {
1299 sctp_unhash_established(asoc
);
1300 sctp_association_free(asoc
);
1305 if (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
) {
1306 struct sctp_chunk
*chunk
;
1308 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1310 sctp_primitive_ABORT(asoc
, chunk
);
1312 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1315 /* Clean up any skbs sitting on the receive queue. */
1316 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1317 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1319 /* On a TCP-style socket, block for at most linger_time if set. */
1320 if (sctp_style(sk
, TCP
) && timeout
)
1321 sctp_wait_for_close(sk
, timeout
);
1323 /* This will run the backlog queue. */
1324 sctp_release_sock(sk
);
1326 /* Supposedly, no process has access to the socket, but
1327 * the net layers still may.
1329 sctp_local_bh_disable();
1330 sctp_bh_lock_sock(sk
);
1332 /* Hold the sock, since sk_common_release() will put sock_put()
1333 * and we have just a little more cleanup.
1336 sk_common_release(sk
);
1338 sctp_bh_unlock_sock(sk
);
1339 sctp_local_bh_enable();
1343 SCTP_DBG_OBJCNT_DEC(sock
);
1346 /* Handle EPIPE error. */
1347 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1350 err
= sock_error(sk
) ? : -EPIPE
;
1351 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1352 send_sig(SIGPIPE
, current
, 0);
1356 /* API 3.1.3 sendmsg() - UDP Style Syntax
1358 * An application uses sendmsg() and recvmsg() calls to transmit data to
1359 * and receive data from its peer.
1361 * ssize_t sendmsg(int socket, const struct msghdr *message,
1364 * socket - the socket descriptor of the endpoint.
1365 * message - pointer to the msghdr structure which contains a single
1366 * user message and possibly some ancillary data.
1368 * See Section 5 for complete description of the data
1371 * flags - flags sent or received with the user message, see Section
1372 * 5 for complete description of the flags.
1374 * Note: This function could use a rewrite especially when explicit
1375 * connect support comes in.
1377 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1379 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1381 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1382 struct msghdr
*msg
, size_t msg_len
)
1384 struct sctp_sock
*sp
;
1385 struct sctp_endpoint
*ep
;
1386 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1387 struct sctp_transport
*transport
, *chunk_tp
;
1388 struct sctp_chunk
*chunk
;
1390 struct sockaddr
*msg_name
= NULL
;
1391 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1392 struct sctp_sndrcvinfo
*sinfo
;
1393 struct sctp_initmsg
*sinit
;
1394 sctp_assoc_t associd
= 0;
1395 sctp_cmsgs_t cmsgs
= { NULL
};
1399 __u16 sinfo_flags
= 0;
1400 struct sctp_datamsg
*datamsg
;
1401 struct list_head
*pos
;
1402 int msg_flags
= msg
->msg_flags
;
1404 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1411 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1413 /* We cannot send a message over a TCP-style listening socket. */
1414 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1419 /* Parse out the SCTP CMSGs. */
1420 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1423 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1427 /* Fetch the destination address for this packet. This
1428 * address only selects the association--it is not necessarily
1429 * the address we will send to.
1430 * For a peeled-off socket, msg_name is ignored.
1432 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1433 int msg_namelen
= msg
->msg_namelen
;
1435 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1440 if (msg_namelen
> sizeof(to
))
1441 msg_namelen
= sizeof(to
);
1442 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1443 msg_name
= msg
->msg_name
;
1449 /* Did the user specify SNDRCVINFO? */
1451 sinfo_flags
= sinfo
->sinfo_flags
;
1452 associd
= sinfo
->sinfo_assoc_id
;
1455 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1456 msg_len
, sinfo_flags
);
1458 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1459 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1464 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1465 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1466 * If SCTP_ABORT is set, the message length could be non zero with
1467 * the msg_iov set to the user abort reason.
1469 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1470 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1475 /* If SCTP_ADDR_OVER is set, there must be an address
1476 * specified in msg_name.
1478 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1485 SCTP_DEBUG_PRINTK("About to look up association.\n");
1489 /* If a msg_name has been specified, assume this is to be used. */
1491 /* Look for a matching association on the endpoint. */
1492 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1494 /* If we could not find a matching association on the
1495 * endpoint, make sure that it is not a TCP-style
1496 * socket that already has an association or there is
1497 * no peeled-off association on another socket.
1499 if ((sctp_style(sk
, TCP
) &&
1500 sctp_sstate(sk
, ESTABLISHED
)) ||
1501 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1502 err
= -EADDRNOTAVAIL
;
1507 asoc
= sctp_id2assoc(sk
, associd
);
1515 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1517 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1518 * socket that has an association in CLOSED state. This can
1519 * happen when an accepted socket has an association that is
1522 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1527 if (sinfo_flags
& SCTP_EOF
) {
1528 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1530 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1534 if (sinfo_flags
& SCTP_ABORT
) {
1536 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1542 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1543 sctp_primitive_ABORT(asoc
, chunk
);
1549 /* Do we need to create the association? */
1551 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1553 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1558 /* Check for invalid stream against the stream counts,
1559 * either the default or the user specified stream counts.
1562 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1563 /* Check against the defaults. */
1564 if (sinfo
->sinfo_stream
>=
1565 sp
->initmsg
.sinit_num_ostreams
) {
1570 /* Check against the requested. */
1571 if (sinfo
->sinfo_stream
>=
1572 sinit
->sinit_num_ostreams
) {
1580 * API 3.1.2 bind() - UDP Style Syntax
1581 * If a bind() or sctp_bindx() is not called prior to a
1582 * sendmsg() call that initiates a new association, the
1583 * system picks an ephemeral port and will choose an address
1584 * set equivalent to binding with a wildcard address.
1586 if (!ep
->base
.bind_addr
.port
) {
1587 if (sctp_autobind(sk
)) {
1593 * If an unprivileged user inherits a one-to-many
1594 * style socket with open associations on a privileged
1595 * port, it MAY be permitted to accept new associations,
1596 * but it SHOULD NOT be permitted to open new
1599 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1600 !capable(CAP_NET_BIND_SERVICE
)) {
1606 scope
= sctp_scope(&to
);
1607 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1614 /* If the SCTP_INIT ancillary data is specified, set all
1615 * the association init values accordingly.
1618 if (sinit
->sinit_num_ostreams
) {
1619 asoc
->c
.sinit_num_ostreams
=
1620 sinit
->sinit_num_ostreams
;
1622 if (sinit
->sinit_max_instreams
) {
1623 asoc
->c
.sinit_max_instreams
=
1624 sinit
->sinit_max_instreams
;
1626 if (sinit
->sinit_max_attempts
) {
1627 asoc
->max_init_attempts
1628 = sinit
->sinit_max_attempts
;
1630 if (sinit
->sinit_max_init_timeo
) {
1631 asoc
->max_init_timeo
=
1632 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1636 /* Prime the peer's transport structures. */
1637 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1642 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1649 /* ASSERT: we have a valid association at this point. */
1650 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1653 /* If the user didn't specify SNDRCVINFO, make up one with
1656 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1657 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1658 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1659 default_sinfo
.sinfo_context
= asoc
->default_context
;
1660 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1661 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1662 sinfo
= &default_sinfo
;
1665 /* API 7.1.7, the sndbuf size per association bounds the
1666 * maximum size of data that can be sent in a single send call.
1668 if (msg_len
> sk
->sk_sndbuf
) {
1673 if (asoc
->pmtu_pending
)
1674 sctp_assoc_pending_pmtu(asoc
);
1676 /* If fragmentation is disabled and the message length exceeds the
1677 * association fragmentation point, return EMSGSIZE. The I-D
1678 * does not specify what this error is, but this looks like
1681 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1687 /* Check for invalid stream. */
1688 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1694 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1695 if (!sctp_wspace(asoc
)) {
1696 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1701 /* If an address is passed with the sendto/sendmsg call, it is used
1702 * to override the primary destination address in the TCP model, or
1703 * when SCTP_ADDR_OVER flag is set in the UDP model.
1705 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1706 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1707 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1715 /* Auto-connect, if we aren't connected already. */
1716 if (sctp_state(asoc
, CLOSED
)) {
1717 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1720 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1723 /* Break the message into multiple chunks of maximum size. */
1724 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1730 /* Now send the (possibly) fragmented message. */
1731 list_for_each(pos
, &datamsg
->chunks
) {
1732 chunk
= list_entry(pos
, struct sctp_chunk
, frag_list
);
1733 sctp_datamsg_track(chunk
);
1735 /* Do accounting for the write space. */
1736 sctp_set_owner_w(chunk
);
1738 chunk
->transport
= chunk_tp
;
1740 /* Send it to the lower layers. Note: all chunks
1741 * must either fail or succeed. The lower layer
1742 * works that way today. Keep it that way or this
1745 err
= sctp_primitive_SEND(asoc
, chunk
);
1746 /* Did the lower layer accept the chunk? */
1748 sctp_chunk_free(chunk
);
1749 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1752 sctp_datamsg_free(datamsg
);
1758 /* If we are already past ASSOCIATE, the lower
1759 * layers are responsible for association cleanup.
1765 sctp_association_free(asoc
);
1767 sctp_release_sock(sk
);
1770 return sctp_error(sk
, msg_flags
, err
);
1777 err
= sock_error(sk
);
1787 /* This is an extended version of skb_pull() that removes the data from the
1788 * start of a skb even when data is spread across the list of skb's in the
1789 * frag_list. len specifies the total amount of data that needs to be removed.
1790 * when 'len' bytes could be removed from the skb, it returns 0.
1791 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1792 * could not be removed.
1794 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1796 struct sk_buff
*list
;
1797 int skb_len
= skb_headlen(skb
);
1800 if (len
<= skb_len
) {
1801 __skb_pull(skb
, len
);
1805 __skb_pull(skb
, skb_len
);
1807 for (list
= skb_shinfo(skb
)->frag_list
; list
; list
= list
->next
) {
1808 rlen
= sctp_skb_pull(list
, len
);
1809 skb
->len
-= (len
-rlen
);
1810 skb
->data_len
-= (len
-rlen
);
1821 /* API 3.1.3 recvmsg() - UDP Style Syntax
1823 * ssize_t recvmsg(int socket, struct msghdr *message,
1826 * socket - the socket descriptor of the endpoint.
1827 * message - pointer to the msghdr structure which contains a single
1828 * user message and possibly some ancillary data.
1830 * See Section 5 for complete description of the data
1833 * flags - flags sent or received with the user message, see Section
1834 * 5 for complete description of the flags.
1836 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1838 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1839 struct msghdr
*msg
, size_t len
, int noblock
,
1840 int flags
, int *addr_len
)
1842 struct sctp_ulpevent
*event
= NULL
;
1843 struct sctp_sock
*sp
= sctp_sk(sk
);
1844 struct sk_buff
*skb
;
1849 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1850 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1851 "len", len
, "knoblauch", noblock
,
1852 "flags", flags
, "addr_len", addr_len
);
1856 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1861 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1865 /* Get the total length of the skb including any skb's in the
1874 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1876 event
= sctp_skb2event(skb
);
1881 sock_recv_timestamp(msg
, sk
, skb
);
1882 if (sctp_ulpevent_is_notification(event
)) {
1883 msg
->msg_flags
|= MSG_NOTIFICATION
;
1884 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1886 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1889 /* Check if we allow SCTP_SNDRCVINFO. */
1890 if (sp
->subscribe
.sctp_data_io_event
)
1891 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1893 /* FIXME: we should be calling IP/IPv6 layers. */
1894 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1895 ip_cmsg_recv(msg
, skb
);
1900 /* If skb's length exceeds the user's buffer, update the skb and
1901 * push it back to the receive_queue so that the next call to
1902 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1904 if (skb_len
> copied
) {
1905 msg
->msg_flags
&= ~MSG_EOR
;
1906 if (flags
& MSG_PEEK
)
1908 sctp_skb_pull(skb
, copied
);
1909 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1911 /* When only partial message is copied to the user, increase
1912 * rwnd by that amount. If all the data in the skb is read,
1913 * rwnd is updated when the event is freed.
1915 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
1917 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
1918 (event
->msg_flags
& MSG_EOR
))
1919 msg
->msg_flags
|= MSG_EOR
;
1921 msg
->msg_flags
&= ~MSG_EOR
;
1924 if (flags
& MSG_PEEK
) {
1925 /* Release the skb reference acquired after peeking the skb in
1926 * sctp_skb_recv_datagram().
1930 /* Free the event which includes releasing the reference to
1931 * the owner of the skb, freeing the skb and updating the
1934 sctp_ulpevent_free(event
);
1937 sctp_release_sock(sk
);
1941 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1943 * This option is a on/off flag. If enabled no SCTP message
1944 * fragmentation will be performed. Instead if a message being sent
1945 * exceeds the current PMTU size, the message will NOT be sent and
1946 * instead a error will be indicated to the user.
1948 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
1949 char __user
*optval
, int optlen
)
1953 if (optlen
< sizeof(int))
1956 if (get_user(val
, (int __user
*)optval
))
1959 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
1964 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
1967 if (optlen
!= sizeof(struct sctp_event_subscribe
))
1969 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
1974 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
1976 * This socket option is applicable to the UDP-style socket only. When
1977 * set it will cause associations that are idle for more than the
1978 * specified number of seconds to automatically close. An association
1979 * being idle is defined an association that has NOT sent or received
1980 * user data. The special value of '0' indicates that no automatic
1981 * close of any associations should be performed. The option expects an
1982 * integer defining the number of seconds of idle time before an
1983 * association is closed.
1985 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
1988 struct sctp_sock
*sp
= sctp_sk(sk
);
1990 /* Applicable to UDP-style socket only */
1991 if (sctp_style(sk
, TCP
))
1993 if (optlen
!= sizeof(int))
1995 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2001 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2003 * Applications can enable or disable heartbeats for any peer address of
2004 * an association, modify an address's heartbeat interval, force a
2005 * heartbeat to be sent immediately, and adjust the address's maximum
2006 * number of retransmissions sent before an address is considered
2007 * unreachable. The following structure is used to access and modify an
2008 * address's parameters:
2010 * struct sctp_paddrparams {
2011 * sctp_assoc_t spp_assoc_id;
2012 * struct sockaddr_storage spp_address;
2013 * uint32_t spp_hbinterval;
2014 * uint16_t spp_pathmaxrxt;
2015 * uint32_t spp_pathmtu;
2016 * uint32_t spp_sackdelay;
2017 * uint32_t spp_flags;
2020 * spp_assoc_id - (one-to-many style socket) This is filled in the
2021 * application, and identifies the association for
2023 * spp_address - This specifies which address is of interest.
2024 * spp_hbinterval - This contains the value of the heartbeat interval,
2025 * in milliseconds. If a value of zero
2026 * is present in this field then no changes are to
2027 * be made to this parameter.
2028 * spp_pathmaxrxt - This contains the maximum number of
2029 * retransmissions before this address shall be
2030 * considered unreachable. If a value of zero
2031 * is present in this field then no changes are to
2032 * be made to this parameter.
2033 * spp_pathmtu - When Path MTU discovery is disabled the value
2034 * specified here will be the "fixed" path mtu.
2035 * Note that if the spp_address field is empty
2036 * then all associations on this address will
2037 * have this fixed path mtu set upon them.
2039 * spp_sackdelay - When delayed sack is enabled, this value specifies
2040 * the number of milliseconds that sacks will be delayed
2041 * for. This value will apply to all addresses of an
2042 * association if the spp_address field is empty. Note
2043 * also, that if delayed sack is enabled and this
2044 * value is set to 0, no change is made to the last
2045 * recorded delayed sack timer value.
2047 * spp_flags - These flags are used to control various features
2048 * on an association. The flag field may contain
2049 * zero or more of the following options.
2051 * SPP_HB_ENABLE - Enable heartbeats on the
2052 * specified address. Note that if the address
2053 * field is empty all addresses for the association
2054 * have heartbeats enabled upon them.
2056 * SPP_HB_DISABLE - Disable heartbeats on the
2057 * speicifed address. Note that if the address
2058 * field is empty all addresses for the association
2059 * will have their heartbeats disabled. Note also
2060 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2061 * mutually exclusive, only one of these two should
2062 * be specified. Enabling both fields will have
2063 * undetermined results.
2065 * SPP_HB_DEMAND - Request a user initiated heartbeat
2066 * to be made immediately.
2068 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2069 * heartbeat delayis to be set to the value of 0
2072 * SPP_PMTUD_ENABLE - This field will enable PMTU
2073 * discovery upon the specified address. Note that
2074 * if the address feild is empty then all addresses
2075 * on the association are effected.
2077 * SPP_PMTUD_DISABLE - This field will disable PMTU
2078 * discovery upon the specified address. Note that
2079 * if the address feild is empty then all addresses
2080 * on the association are effected. Not also that
2081 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2082 * exclusive. Enabling both will have undetermined
2085 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2086 * on delayed sack. The time specified in spp_sackdelay
2087 * is used to specify the sack delay for this address. Note
2088 * that if spp_address is empty then all addresses will
2089 * enable delayed sack and take on the sack delay
2090 * value specified in spp_sackdelay.
2091 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2092 * off delayed sack. If the spp_address field is blank then
2093 * delayed sack is disabled for the entire association. Note
2094 * also that this field is mutually exclusive to
2095 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2098 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2099 struct sctp_transport
*trans
,
2100 struct sctp_association
*asoc
,
2101 struct sctp_sock
*sp
,
2104 int sackdelay_change
)
2108 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2109 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2114 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2115 * this field is ignored. Note also that a value of zero indicates
2116 * the current setting should be left unchanged.
2118 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2120 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2121 * set. This lets us use 0 value when this flag
2124 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2125 params
->spp_hbinterval
= 0;
2127 if (params
->spp_hbinterval
||
2128 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2131 msecs_to_jiffies(params
->spp_hbinterval
);
2134 msecs_to_jiffies(params
->spp_hbinterval
);
2136 sp
->hbinterval
= params
->spp_hbinterval
;
2143 trans
->param_flags
=
2144 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2147 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2150 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2154 /* When Path MTU discovery is disabled the value specified here will
2155 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2156 * include the flag SPP_PMTUD_DISABLE for this field to have any
2159 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2161 trans
->pathmtu
= params
->spp_pathmtu
;
2162 sctp_assoc_sync_pmtu(asoc
);
2164 asoc
->pathmtu
= params
->spp_pathmtu
;
2165 sctp_frag_point(sp
, params
->spp_pathmtu
);
2167 sp
->pathmtu
= params
->spp_pathmtu
;
2173 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2174 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2175 trans
->param_flags
=
2176 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2178 sctp_transport_pmtu(trans
);
2179 sctp_assoc_sync_pmtu(asoc
);
2183 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2186 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2190 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2191 * value of this field is ignored. Note also that a value of zero
2192 * indicates the current setting should be left unchanged.
2194 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2197 msecs_to_jiffies(params
->spp_sackdelay
);
2200 msecs_to_jiffies(params
->spp_sackdelay
);
2202 sp
->sackdelay
= params
->spp_sackdelay
;
2206 if (sackdelay_change
) {
2208 trans
->param_flags
=
2209 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2213 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2217 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2222 /* Note that unless the spp_flag is set to SPP_PMTUD_ENABLE the value
2223 * of this field is ignored. Note also that a value of zero
2224 * indicates the current setting should be left unchanged.
2226 if ((params
->spp_flags
& SPP_PMTUD_ENABLE
) && params
->spp_pathmaxrxt
) {
2228 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2230 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2232 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2239 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2240 char __user
*optval
, int optlen
)
2242 struct sctp_paddrparams params
;
2243 struct sctp_transport
*trans
= NULL
;
2244 struct sctp_association
*asoc
= NULL
;
2245 struct sctp_sock
*sp
= sctp_sk(sk
);
2247 int hb_change
, pmtud_change
, sackdelay_change
;
2249 if (optlen
!= sizeof(struct sctp_paddrparams
))
2252 if (copy_from_user(¶ms
, optval
, optlen
))
2255 /* Validate flags and value parameters. */
2256 hb_change
= params
.spp_flags
& SPP_HB
;
2257 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2258 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2260 if (hb_change
== SPP_HB
||
2261 pmtud_change
== SPP_PMTUD
||
2262 sackdelay_change
== SPP_SACKDELAY
||
2263 params
.spp_sackdelay
> 500 ||
2265 && params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2268 /* If an address other than INADDR_ANY is specified, and
2269 * no transport is found, then the request is invalid.
2271 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
2272 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2273 params
.spp_assoc_id
);
2278 /* Get association, if assoc_id != 0 and the socket is a one
2279 * to many style socket, and an association was not found, then
2280 * the id was invalid.
2282 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2283 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2286 /* Heartbeat demand can only be sent on a transport or
2287 * association, but not a socket.
2289 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2292 /* Process parameters. */
2293 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2294 hb_change
, pmtud_change
,
2300 /* If changes are for association, also apply parameters to each
2303 if (!trans
&& asoc
) {
2304 struct list_head
*pos
;
2306 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2307 trans
= list_entry(pos
, struct sctp_transport
,
2309 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2310 hb_change
, pmtud_change
,
2318 /* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
2320 * This options will get or set the delayed ack timer. The time is set
2321 * in milliseconds. If the assoc_id is 0, then this sets or gets the
2322 * endpoints default delayed ack timer value. If the assoc_id field is
2323 * non-zero, then the set or get effects the specified association.
2325 * struct sctp_assoc_value {
2326 * sctp_assoc_t assoc_id;
2327 * uint32_t assoc_value;
2330 * assoc_id - This parameter, indicates which association the
2331 * user is preforming an action upon. Note that if
2332 * this field's value is zero then the endpoints
2333 * default value is changed (effecting future
2334 * associations only).
2336 * assoc_value - This parameter contains the number of milliseconds
2337 * that the user is requesting the delayed ACK timer
2338 * be set to. Note that this value is defined in
2339 * the standard to be between 200 and 500 milliseconds.
2341 * Note: a value of zero will leave the value alone,
2342 * but disable SACK delay. A non-zero value will also
2343 * enable SACK delay.
2346 static int sctp_setsockopt_delayed_ack_time(struct sock
*sk
,
2347 char __user
*optval
, int optlen
)
2349 struct sctp_assoc_value params
;
2350 struct sctp_transport
*trans
= NULL
;
2351 struct sctp_association
*asoc
= NULL
;
2352 struct sctp_sock
*sp
= sctp_sk(sk
);
2354 if (optlen
!= sizeof(struct sctp_assoc_value
))
2357 if (copy_from_user(¶ms
, optval
, optlen
))
2360 /* Validate value parameter. */
2361 if (params
.assoc_value
> 500)
2364 /* Get association, if assoc_id != 0 and the socket is a one
2365 * to many style socket, and an association was not found, then
2366 * the id was invalid.
2368 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2369 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
2372 if (params
.assoc_value
) {
2375 msecs_to_jiffies(params
.assoc_value
);
2377 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2378 SPP_SACKDELAY_ENABLE
;
2380 sp
->sackdelay
= params
.assoc_value
;
2382 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2383 SPP_SACKDELAY_ENABLE
;
2388 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2389 SPP_SACKDELAY_DISABLE
;
2392 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2393 SPP_SACKDELAY_DISABLE
;
2397 /* If change is for association, also apply to each transport. */
2399 struct list_head
*pos
;
2401 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2402 trans
= list_entry(pos
, struct sctp_transport
,
2404 if (params
.assoc_value
) {
2406 msecs_to_jiffies(params
.assoc_value
);
2407 trans
->param_flags
=
2408 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2409 SPP_SACKDELAY_ENABLE
;
2411 trans
->param_flags
=
2412 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2413 SPP_SACKDELAY_DISABLE
;
2421 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2423 * Applications can specify protocol parameters for the default association
2424 * initialization. The option name argument to setsockopt() and getsockopt()
2427 * Setting initialization parameters is effective only on an unconnected
2428 * socket (for UDP-style sockets only future associations are effected
2429 * by the change). With TCP-style sockets, this option is inherited by
2430 * sockets derived from a listener socket.
2432 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, int optlen
)
2434 struct sctp_initmsg sinit
;
2435 struct sctp_sock
*sp
= sctp_sk(sk
);
2437 if (optlen
!= sizeof(struct sctp_initmsg
))
2439 if (copy_from_user(&sinit
, optval
, optlen
))
2442 if (sinit
.sinit_num_ostreams
)
2443 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2444 if (sinit
.sinit_max_instreams
)
2445 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2446 if (sinit
.sinit_max_attempts
)
2447 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2448 if (sinit
.sinit_max_init_timeo
)
2449 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2455 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2457 * Applications that wish to use the sendto() system call may wish to
2458 * specify a default set of parameters that would normally be supplied
2459 * through the inclusion of ancillary data. This socket option allows
2460 * such an application to set the default sctp_sndrcvinfo structure.
2461 * The application that wishes to use this socket option simply passes
2462 * in to this call the sctp_sndrcvinfo structure defined in Section
2463 * 5.2.2) The input parameters accepted by this call include
2464 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2465 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2466 * to this call if the caller is using the UDP model.
2468 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2469 char __user
*optval
, int optlen
)
2471 struct sctp_sndrcvinfo info
;
2472 struct sctp_association
*asoc
;
2473 struct sctp_sock
*sp
= sctp_sk(sk
);
2475 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2477 if (copy_from_user(&info
, optval
, optlen
))
2480 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2481 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2485 asoc
->default_stream
= info
.sinfo_stream
;
2486 asoc
->default_flags
= info
.sinfo_flags
;
2487 asoc
->default_ppid
= info
.sinfo_ppid
;
2488 asoc
->default_context
= info
.sinfo_context
;
2489 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2491 sp
->default_stream
= info
.sinfo_stream
;
2492 sp
->default_flags
= info
.sinfo_flags
;
2493 sp
->default_ppid
= info
.sinfo_ppid
;
2494 sp
->default_context
= info
.sinfo_context
;
2495 sp
->default_timetolive
= info
.sinfo_timetolive
;
2501 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2503 * Requests that the local SCTP stack use the enclosed peer address as
2504 * the association primary. The enclosed address must be one of the
2505 * association peer's addresses.
2507 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2510 struct sctp_prim prim
;
2511 struct sctp_transport
*trans
;
2513 if (optlen
!= sizeof(struct sctp_prim
))
2516 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2519 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2523 sctp_assoc_set_primary(trans
->asoc
, trans
);
2529 * 7.1.5 SCTP_NODELAY
2531 * Turn on/off any Nagle-like algorithm. This means that packets are
2532 * generally sent as soon as possible and no unnecessary delays are
2533 * introduced, at the cost of more packets in the network. Expects an
2534 * integer boolean flag.
2536 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2541 if (optlen
< sizeof(int))
2543 if (get_user(val
, (int __user
*)optval
))
2546 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2552 * 7.1.1 SCTP_RTOINFO
2554 * The protocol parameters used to initialize and bound retransmission
2555 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2556 * and modify these parameters.
2557 * All parameters are time values, in milliseconds. A value of 0, when
2558 * modifying the parameters, indicates that the current value should not
2562 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, int optlen
) {
2563 struct sctp_rtoinfo rtoinfo
;
2564 struct sctp_association
*asoc
;
2566 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2569 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2572 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2574 /* Set the values to the specific association */
2575 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2579 if (rtoinfo
.srto_initial
!= 0)
2581 msecs_to_jiffies(rtoinfo
.srto_initial
);
2582 if (rtoinfo
.srto_max
!= 0)
2583 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2584 if (rtoinfo
.srto_min
!= 0)
2585 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2587 /* If there is no association or the association-id = 0
2588 * set the values to the endpoint.
2590 struct sctp_sock
*sp
= sctp_sk(sk
);
2592 if (rtoinfo
.srto_initial
!= 0)
2593 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2594 if (rtoinfo
.srto_max
!= 0)
2595 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2596 if (rtoinfo
.srto_min
!= 0)
2597 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2605 * 7.1.2 SCTP_ASSOCINFO
2607 * This option is used to tune the maximum retransmission attempts
2608 * of the association.
2609 * Returns an error if the new association retransmission value is
2610 * greater than the sum of the retransmission value of the peer.
2611 * See [SCTP] for more information.
2614 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, int optlen
)
2617 struct sctp_assocparams assocparams
;
2618 struct sctp_association
*asoc
;
2620 if (optlen
!= sizeof(struct sctp_assocparams
))
2622 if (copy_from_user(&assocparams
, optval
, optlen
))
2625 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2627 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2630 /* Set the values to the specific association */
2632 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2635 struct list_head
*pos
;
2636 struct sctp_transport
*peer_addr
;
2638 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2639 peer_addr
= list_entry(pos
,
2640 struct sctp_transport
,
2642 path_sum
+= peer_addr
->pathmaxrxt
;
2646 /* Only validate asocmaxrxt if we have more then
2647 * one path/transport. We do this because path
2648 * retransmissions are only counted when we have more
2652 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2655 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2658 if (assocparams
.sasoc_cookie_life
!= 0) {
2659 asoc
->cookie_life
.tv_sec
=
2660 assocparams
.sasoc_cookie_life
/ 1000;
2661 asoc
->cookie_life
.tv_usec
=
2662 (assocparams
.sasoc_cookie_life
% 1000)
2666 /* Set the values to the endpoint */
2667 struct sctp_sock
*sp
= sctp_sk(sk
);
2669 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2670 sp
->assocparams
.sasoc_asocmaxrxt
=
2671 assocparams
.sasoc_asocmaxrxt
;
2672 if (assocparams
.sasoc_cookie_life
!= 0)
2673 sp
->assocparams
.sasoc_cookie_life
=
2674 assocparams
.sasoc_cookie_life
;
2680 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2682 * This socket option is a boolean flag which turns on or off mapped V4
2683 * addresses. If this option is turned on and the socket is type
2684 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2685 * If this option is turned off, then no mapping will be done of V4
2686 * addresses and a user will receive both PF_INET6 and PF_INET type
2687 * addresses on the socket.
2689 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, int optlen
)
2692 struct sctp_sock
*sp
= sctp_sk(sk
);
2694 if (optlen
< sizeof(int))
2696 if (get_user(val
, (int __user
*)optval
))
2707 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2709 * This socket option specifies the maximum size to put in any outgoing
2710 * SCTP chunk. If a message is larger than this size it will be
2711 * fragmented by SCTP into the specified size. Note that the underlying
2712 * SCTP implementation may fragment into smaller sized chunks when the
2713 * PMTU of the underlying association is smaller than the value set by
2716 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, int optlen
)
2718 struct sctp_association
*asoc
;
2719 struct list_head
*pos
;
2720 struct sctp_sock
*sp
= sctp_sk(sk
);
2723 if (optlen
< sizeof(int))
2725 if (get_user(val
, (int __user
*)optval
))
2727 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2729 sp
->user_frag
= val
;
2731 /* Update the frag_point of the existing associations. */
2732 list_for_each(pos
, &(sp
->ep
->asocs
)) {
2733 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
2734 asoc
->frag_point
= sctp_frag_point(sp
, asoc
->pathmtu
);
2742 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2744 * Requests that the peer mark the enclosed address as the association
2745 * primary. The enclosed address must be one of the association's
2746 * locally bound addresses. The following structure is used to make a
2747 * set primary request:
2749 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2752 struct sctp_sock
*sp
;
2753 struct sctp_endpoint
*ep
;
2754 struct sctp_association
*asoc
= NULL
;
2755 struct sctp_setpeerprim prim
;
2756 struct sctp_chunk
*chunk
;
2762 if (!sctp_addip_enable
)
2765 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2768 if (copy_from_user(&prim
, optval
, optlen
))
2771 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2775 if (!asoc
->peer
.asconf_capable
)
2778 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2781 if (!sctp_state(asoc
, ESTABLISHED
))
2784 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2785 return -EADDRNOTAVAIL
;
2787 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2788 chunk
= sctp_make_asconf_set_prim(asoc
,
2789 (union sctp_addr
*)&prim
.sspp_addr
);
2793 err
= sctp_send_asconf(asoc
, chunk
);
2795 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2800 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
2803 struct sctp_setadaptation adaptation
;
2805 if (optlen
!= sizeof(struct sctp_setadaptation
))
2807 if (copy_from_user(&adaptation
, optval
, optlen
))
2810 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
2816 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2818 * The context field in the sctp_sndrcvinfo structure is normally only
2819 * used when a failed message is retrieved holding the value that was
2820 * sent down on the actual send call. This option allows the setting of
2821 * a default context on an association basis that will be received on
2822 * reading messages from the peer. This is especially helpful in the
2823 * one-2-many model for an application to keep some reference to an
2824 * internal state machine that is processing messages on the
2825 * association. Note that the setting of this value only effects
2826 * received messages from the peer and does not effect the value that is
2827 * saved with outbound messages.
2829 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
2832 struct sctp_assoc_value params
;
2833 struct sctp_sock
*sp
;
2834 struct sctp_association
*asoc
;
2836 if (optlen
!= sizeof(struct sctp_assoc_value
))
2838 if (copy_from_user(¶ms
, optval
, optlen
))
2843 if (params
.assoc_id
!= 0) {
2844 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2847 asoc
->default_rcv_context
= params
.assoc_value
;
2849 sp
->default_rcv_context
= params
.assoc_value
;
2856 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
2858 * This options will at a minimum specify if the implementation is doing
2859 * fragmented interleave. Fragmented interleave, for a one to many
2860 * socket, is when subsequent calls to receive a message may return
2861 * parts of messages from different associations. Some implementations
2862 * may allow you to turn this value on or off. If so, when turned off,
2863 * no fragment interleave will occur (which will cause a head of line
2864 * blocking amongst multiple associations sharing the same one to many
2865 * socket). When this option is turned on, then each receive call may
2866 * come from a different association (thus the user must receive data
2867 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
2868 * association each receive belongs to.
2870 * This option takes a boolean value. A non-zero value indicates that
2871 * fragmented interleave is on. A value of zero indicates that
2872 * fragmented interleave is off.
2874 * Note that it is important that an implementation that allows this
2875 * option to be turned on, have it off by default. Otherwise an unaware
2876 * application using the one to many model may become confused and act
2879 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
2880 char __user
*optval
,
2885 if (optlen
!= sizeof(int))
2887 if (get_user(val
, (int __user
*)optval
))
2890 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
2896 * 7.1.25. Set or Get the sctp partial delivery point
2897 * (SCTP_PARTIAL_DELIVERY_POINT)
2898 * This option will set or get the SCTP partial delivery point. This
2899 * point is the size of a message where the partial delivery API will be
2900 * invoked to help free up rwnd space for the peer. Setting this to a
2901 * lower value will cause partial delivery's to happen more often. The
2902 * calls argument is an integer that sets or gets the partial delivery
2905 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
2906 char __user
*optval
,
2911 if (optlen
!= sizeof(u32
))
2913 if (get_user(val
, (int __user
*)optval
))
2916 sctp_sk(sk
)->pd_point
= val
;
2918 return 0; /* is this the right error code? */
2922 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
2924 * This option will allow a user to change the maximum burst of packets
2925 * that can be emitted by this association. Note that the default value
2926 * is 4, and some implementations may restrict this setting so that it
2927 * can only be lowered.
2929 * NOTE: This text doesn't seem right. Do this on a socket basis with
2930 * future associations inheriting the socket value.
2932 static int sctp_setsockopt_maxburst(struct sock
*sk
,
2933 char __user
*optval
,
2938 if (optlen
!= sizeof(int))
2940 if (get_user(val
, (int __user
*)optval
))
2946 sctp_sk(sk
)->max_burst
= val
;
2951 /* API 6.2 setsockopt(), getsockopt()
2953 * Applications use setsockopt() and getsockopt() to set or retrieve
2954 * socket options. Socket options are used to change the default
2955 * behavior of sockets calls. They are described in Section 7.
2959 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
2960 * int __user *optlen);
2961 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
2964 * sd - the socket descript.
2965 * level - set to IPPROTO_SCTP for all SCTP options.
2966 * optname - the option name.
2967 * optval - the buffer to store the value of the option.
2968 * optlen - the size of the buffer.
2970 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
2971 char __user
*optval
, int optlen
)
2975 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
2978 /* I can hardly begin to describe how wrong this is. This is
2979 * so broken as to be worse than useless. The API draft
2980 * REALLY is NOT helpful here... I am not convinced that the
2981 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
2982 * are at all well-founded.
2984 if (level
!= SOL_SCTP
) {
2985 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
2986 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2993 case SCTP_SOCKOPT_BINDX_ADD
:
2994 /* 'optlen' is the size of the addresses buffer. */
2995 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2996 optlen
, SCTP_BINDX_ADD_ADDR
);
2999 case SCTP_SOCKOPT_BINDX_REM
:
3000 /* 'optlen' is the size of the addresses buffer. */
3001 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3002 optlen
, SCTP_BINDX_REM_ADDR
);
3005 case SCTP_SOCKOPT_CONNECTX
:
3006 /* 'optlen' is the size of the addresses buffer. */
3007 retval
= sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)optval
,
3011 case SCTP_DISABLE_FRAGMENTS
:
3012 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3016 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3019 case SCTP_AUTOCLOSE
:
3020 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3023 case SCTP_PEER_ADDR_PARAMS
:
3024 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3027 case SCTP_DELAYED_ACK_TIME
:
3028 retval
= sctp_setsockopt_delayed_ack_time(sk
, optval
, optlen
);
3030 case SCTP_PARTIAL_DELIVERY_POINT
:
3031 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3035 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3037 case SCTP_DEFAULT_SEND_PARAM
:
3038 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3041 case SCTP_PRIMARY_ADDR
:
3042 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3044 case SCTP_SET_PEER_PRIMARY_ADDR
:
3045 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3048 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3051 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3053 case SCTP_ASSOCINFO
:
3054 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3056 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3057 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3060 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3062 case SCTP_ADAPTATION_LAYER
:
3063 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3066 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3068 case SCTP_FRAGMENT_INTERLEAVE
:
3069 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3071 case SCTP_MAX_BURST
:
3072 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3075 retval
= -ENOPROTOOPT
;
3079 sctp_release_sock(sk
);
3085 /* API 3.1.6 connect() - UDP Style Syntax
3087 * An application may use the connect() call in the UDP model to initiate an
3088 * association without sending data.
3092 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3094 * sd: the socket descriptor to have a new association added to.
3096 * nam: the address structure (either struct sockaddr_in or struct
3097 * sockaddr_in6 defined in RFC2553 [7]).
3099 * len: the size of the address.
3101 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3109 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3110 __FUNCTION__
, sk
, addr
, addr_len
);
3112 /* Validate addr_len before calling common connect/connectx routine. */
3113 af
= sctp_get_af_specific(addr
->sa_family
);
3114 if (!af
|| addr_len
< af
->sockaddr_len
) {
3117 /* Pass correct addr len to common routine (so it knows there
3118 * is only one address being passed.
3120 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
);
3123 sctp_release_sock(sk
);
3127 /* FIXME: Write comments. */
3128 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
3130 return -EOPNOTSUPP
; /* STUB */
3133 /* 4.1.4 accept() - TCP Style Syntax
3135 * Applications use accept() call to remove an established SCTP
3136 * association from the accept queue of the endpoint. A new socket
3137 * descriptor will be returned from accept() to represent the newly
3138 * formed association.
3140 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3142 struct sctp_sock
*sp
;
3143 struct sctp_endpoint
*ep
;
3144 struct sock
*newsk
= NULL
;
3145 struct sctp_association
*asoc
;
3154 if (!sctp_style(sk
, TCP
)) {
3155 error
= -EOPNOTSUPP
;
3159 if (!sctp_sstate(sk
, LISTENING
)) {
3164 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3166 error
= sctp_wait_for_accept(sk
, timeo
);
3170 /* We treat the list of associations on the endpoint as the accept
3171 * queue and pick the first association on the list.
3173 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3175 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3181 /* Populate the fields of the newsk from the oldsk and migrate the
3182 * asoc to the newsk.
3184 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3187 sctp_release_sock(sk
);
3192 /* The SCTP ioctl handler. */
3193 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3195 return -ENOIOCTLCMD
;
3198 /* This is the function which gets called during socket creation to
3199 * initialized the SCTP-specific portion of the sock.
3200 * The sock structure should already be zero-filled memory.
3202 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
3204 struct sctp_endpoint
*ep
;
3205 struct sctp_sock
*sp
;
3207 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3211 /* Initialize the SCTP per socket area. */
3212 switch (sk
->sk_type
) {
3213 case SOCK_SEQPACKET
:
3214 sp
->type
= SCTP_SOCKET_UDP
;
3217 sp
->type
= SCTP_SOCKET_TCP
;
3220 return -ESOCKTNOSUPPORT
;
3223 /* Initialize default send parameters. These parameters can be
3224 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3226 sp
->default_stream
= 0;
3227 sp
->default_ppid
= 0;
3228 sp
->default_flags
= 0;
3229 sp
->default_context
= 0;
3230 sp
->default_timetolive
= 0;
3232 sp
->default_rcv_context
= 0;
3233 sp
->max_burst
= sctp_max_burst
;
3235 /* Initialize default setup parameters. These parameters
3236 * can be modified with the SCTP_INITMSG socket option or
3237 * overridden by the SCTP_INIT CMSG.
3239 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3240 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3241 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3242 sp
->initmsg
.sinit_max_init_timeo
= sctp_rto_max
;
3244 /* Initialize default RTO related parameters. These parameters can
3245 * be modified for with the SCTP_RTOINFO socket option.
3247 sp
->rtoinfo
.srto_initial
= sctp_rto_initial
;
3248 sp
->rtoinfo
.srto_max
= sctp_rto_max
;
3249 sp
->rtoinfo
.srto_min
= sctp_rto_min
;
3251 /* Initialize default association related parameters. These parameters
3252 * can be modified with the SCTP_ASSOCINFO socket option.
3254 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3255 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3256 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3257 sp
->assocparams
.sasoc_local_rwnd
= 0;
3258 sp
->assocparams
.sasoc_cookie_life
= sctp_valid_cookie_life
;
3260 /* Initialize default event subscriptions. By default, all the
3263 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3265 /* Default Peer Address Parameters. These defaults can
3266 * be modified via SCTP_PEER_ADDR_PARAMS
3268 sp
->hbinterval
= sctp_hb_interval
;
3269 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3270 sp
->pathmtu
= 0; // allow default discovery
3271 sp
->sackdelay
= sctp_sack_timeout
;
3272 sp
->param_flags
= SPP_HB_ENABLE
|
3274 SPP_SACKDELAY_ENABLE
;
3276 /* If enabled no SCTP message fragmentation will be performed.
3277 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3279 sp
->disable_fragments
= 0;
3281 /* Enable Nagle algorithm by default. */
3284 /* Enable by default. */
3287 /* Auto-close idle associations after the configured
3288 * number of seconds. A value of 0 disables this
3289 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3290 * for UDP-style sockets only.
3294 /* User specified fragmentation limit. */
3297 sp
->adaptation_ind
= 0;
3299 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3301 /* Control variables for partial data delivery. */
3302 atomic_set(&sp
->pd_mode
, 0);
3303 skb_queue_head_init(&sp
->pd_lobby
);
3304 sp
->frag_interleave
= 0;
3306 /* Create a per socket endpoint structure. Even if we
3307 * change the data structure relationships, this may still
3308 * be useful for storing pre-connect address information.
3310 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3317 SCTP_DBG_OBJCNT_INC(sock
);
3321 /* Cleanup any SCTP per socket resources. */
3322 SCTP_STATIC
int sctp_destroy_sock(struct sock
*sk
)
3324 struct sctp_endpoint
*ep
;
3326 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3328 /* Release our hold on the endpoint. */
3329 ep
= sctp_sk(sk
)->ep
;
3330 sctp_endpoint_free(ep
);
3335 /* API 4.1.7 shutdown() - TCP Style Syntax
3336 * int shutdown(int socket, int how);
3338 * sd - the socket descriptor of the association to be closed.
3339 * how - Specifies the type of shutdown. The values are
3342 * Disables further receive operations. No SCTP
3343 * protocol action is taken.
3345 * Disables further send operations, and initiates
3346 * the SCTP shutdown sequence.
3348 * Disables further send and receive operations
3349 * and initiates the SCTP shutdown sequence.
3351 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3353 struct sctp_endpoint
*ep
;
3354 struct sctp_association
*asoc
;
3356 if (!sctp_style(sk
, TCP
))
3359 if (how
& SEND_SHUTDOWN
) {
3360 ep
= sctp_sk(sk
)->ep
;
3361 if (!list_empty(&ep
->asocs
)) {
3362 asoc
= list_entry(ep
->asocs
.next
,
3363 struct sctp_association
, asocs
);
3364 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3369 /* 7.2.1 Association Status (SCTP_STATUS)
3371 * Applications can retrieve current status information about an
3372 * association, including association state, peer receiver window size,
3373 * number of unacked data chunks, and number of data chunks pending
3374 * receipt. This information is read-only.
3376 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3377 char __user
*optval
,
3380 struct sctp_status status
;
3381 struct sctp_association
*asoc
= NULL
;
3382 struct sctp_transport
*transport
;
3383 sctp_assoc_t associd
;
3386 if (len
< sizeof(status
)) {
3391 len
= sizeof(status
);
3392 if (copy_from_user(&status
, optval
, len
)) {
3397 associd
= status
.sstat_assoc_id
;
3398 asoc
= sctp_id2assoc(sk
, associd
);
3404 transport
= asoc
->peer
.primary_path
;
3406 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3407 status
.sstat_state
= asoc
->state
;
3408 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3409 status
.sstat_unackdata
= asoc
->unack_data
;
3411 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3412 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3413 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3414 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3415 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3416 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
3417 transport
->af_specific
->sockaddr_len
);
3418 /* Map ipv4 address into v4-mapped-on-v6 address. */
3419 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3420 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3421 status
.sstat_primary
.spinfo_state
= transport
->state
;
3422 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3423 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3424 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3425 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3427 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3428 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3430 if (put_user(len
, optlen
)) {
3435 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3436 len
, status
.sstat_state
, status
.sstat_rwnd
,
3437 status
.sstat_assoc_id
);
3439 if (copy_to_user(optval
, &status
, len
)) {
3449 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3451 * Applications can retrieve information about a specific peer address
3452 * of an association, including its reachability state, congestion
3453 * window, and retransmission timer values. This information is
3456 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3457 char __user
*optval
,
3460 struct sctp_paddrinfo pinfo
;
3461 struct sctp_transport
*transport
;
3464 if (len
< sizeof(pinfo
)) {
3469 len
= sizeof(pinfo
);
3470 if (copy_from_user(&pinfo
, optval
, len
)) {
3475 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3476 pinfo
.spinfo_assoc_id
);
3480 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3481 pinfo
.spinfo_state
= transport
->state
;
3482 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3483 pinfo
.spinfo_srtt
= transport
->srtt
;
3484 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3485 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3487 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3488 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3490 if (put_user(len
, optlen
)) {
3495 if (copy_to_user(optval
, &pinfo
, len
)) {
3504 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3506 * This option is a on/off flag. If enabled no SCTP message
3507 * fragmentation will be performed. Instead if a message being sent
3508 * exceeds the current PMTU size, the message will NOT be sent and
3509 * instead a error will be indicated to the user.
3511 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3512 char __user
*optval
, int __user
*optlen
)
3516 if (len
< sizeof(int))
3520 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3521 if (put_user(len
, optlen
))
3523 if (copy_to_user(optval
, &val
, len
))
3528 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3530 * This socket option is used to specify various notifications and
3531 * ancillary data the user wishes to receive.
3533 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
3536 if (len
< sizeof(struct sctp_event_subscribe
))
3538 len
= sizeof(struct sctp_event_subscribe
);
3539 if (put_user(len
, optlen
))
3541 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
3546 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3548 * This socket option is applicable to the UDP-style socket only. When
3549 * set it will cause associations that are idle for more than the
3550 * specified number of seconds to automatically close. An association
3551 * being idle is defined an association that has NOT sent or received
3552 * user data. The special value of '0' indicates that no automatic
3553 * close of any associations should be performed. The option expects an
3554 * integer defining the number of seconds of idle time before an
3555 * association is closed.
3557 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3559 /* Applicable to UDP-style socket only */
3560 if (sctp_style(sk
, TCP
))
3562 if (len
< sizeof(int))
3565 if (put_user(len
, optlen
))
3567 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
3572 /* Helper routine to branch off an association to a new socket. */
3573 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3574 struct socket
**sockp
)
3576 struct sock
*sk
= asoc
->base
.sk
;
3577 struct socket
*sock
;
3578 struct inet_sock
*inetsk
;
3582 /* An association cannot be branched off from an already peeled-off
3583 * socket, nor is this supported for tcp style sockets.
3585 if (!sctp_style(sk
, UDP
))
3588 /* Create a new socket. */
3589 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
3593 /* Populate the fields of the newsk from the oldsk and migrate the
3594 * asoc to the newsk.
3596 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
3598 /* Make peeled-off sockets more like 1-1 accepted sockets.
3599 * Set the daddr and initialize id to something more random
3601 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
3602 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
3603 inetsk
= inet_sk(sock
->sk
);
3604 inetsk
->id
= asoc
->next_tsn
^ jiffies
;
3611 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3613 sctp_peeloff_arg_t peeloff
;
3614 struct socket
*newsock
;
3616 struct sctp_association
*asoc
;
3618 if (len
< sizeof(sctp_peeloff_arg_t
))
3620 len
= sizeof(sctp_peeloff_arg_t
);
3621 if (copy_from_user(&peeloff
, optval
, len
))
3624 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
3630 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __FUNCTION__
, sk
, asoc
);
3632 retval
= sctp_do_peeloff(asoc
, &newsock
);
3636 /* Map the socket to an unused fd that can be returned to the user. */
3637 retval
= sock_map_fd(newsock
);
3639 sock_release(newsock
);
3643 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3644 __FUNCTION__
, sk
, asoc
, newsock
->sk
, retval
);
3646 /* Return the fd mapped to the new socket. */
3647 peeloff
.sd
= retval
;
3648 if (put_user(len
, optlen
))
3650 if (copy_to_user(optval
, &peeloff
, len
))
3657 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3659 * Applications can enable or disable heartbeats for any peer address of
3660 * an association, modify an address's heartbeat interval, force a
3661 * heartbeat to be sent immediately, and adjust the address's maximum
3662 * number of retransmissions sent before an address is considered
3663 * unreachable. The following structure is used to access and modify an
3664 * address's parameters:
3666 * struct sctp_paddrparams {
3667 * sctp_assoc_t spp_assoc_id;
3668 * struct sockaddr_storage spp_address;
3669 * uint32_t spp_hbinterval;
3670 * uint16_t spp_pathmaxrxt;
3671 * uint32_t spp_pathmtu;
3672 * uint32_t spp_sackdelay;
3673 * uint32_t spp_flags;
3676 * spp_assoc_id - (one-to-many style socket) This is filled in the
3677 * application, and identifies the association for
3679 * spp_address - This specifies which address is of interest.
3680 * spp_hbinterval - This contains the value of the heartbeat interval,
3681 * in milliseconds. If a value of zero
3682 * is present in this field then no changes are to
3683 * be made to this parameter.
3684 * spp_pathmaxrxt - This contains the maximum number of
3685 * retransmissions before this address shall be
3686 * considered unreachable. If a value of zero
3687 * is present in this field then no changes are to
3688 * be made to this parameter.
3689 * spp_pathmtu - When Path MTU discovery is disabled the value
3690 * specified here will be the "fixed" path mtu.
3691 * Note that if the spp_address field is empty
3692 * then all associations on this address will
3693 * have this fixed path mtu set upon them.
3695 * spp_sackdelay - When delayed sack is enabled, this value specifies
3696 * the number of milliseconds that sacks will be delayed
3697 * for. This value will apply to all addresses of an
3698 * association if the spp_address field is empty. Note
3699 * also, that if delayed sack is enabled and this
3700 * value is set to 0, no change is made to the last
3701 * recorded delayed sack timer value.
3703 * spp_flags - These flags are used to control various features
3704 * on an association. The flag field may contain
3705 * zero or more of the following options.
3707 * SPP_HB_ENABLE - Enable heartbeats on the
3708 * specified address. Note that if the address
3709 * field is empty all addresses for the association
3710 * have heartbeats enabled upon them.
3712 * SPP_HB_DISABLE - Disable heartbeats on the
3713 * speicifed address. Note that if the address
3714 * field is empty all addresses for the association
3715 * will have their heartbeats disabled. Note also
3716 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
3717 * mutually exclusive, only one of these two should
3718 * be specified. Enabling both fields will have
3719 * undetermined results.
3721 * SPP_HB_DEMAND - Request a user initiated heartbeat
3722 * to be made immediately.
3724 * SPP_PMTUD_ENABLE - This field will enable PMTU
3725 * discovery upon the specified address. Note that
3726 * if the address feild is empty then all addresses
3727 * on the association are effected.
3729 * SPP_PMTUD_DISABLE - This field will disable PMTU
3730 * discovery upon the specified address. Note that
3731 * if the address feild is empty then all addresses
3732 * on the association are effected. Not also that
3733 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
3734 * exclusive. Enabling both will have undetermined
3737 * SPP_SACKDELAY_ENABLE - Setting this flag turns
3738 * on delayed sack. The time specified in spp_sackdelay
3739 * is used to specify the sack delay for this address. Note
3740 * that if spp_address is empty then all addresses will
3741 * enable delayed sack and take on the sack delay
3742 * value specified in spp_sackdelay.
3743 * SPP_SACKDELAY_DISABLE - Setting this flag turns
3744 * off delayed sack. If the spp_address field is blank then
3745 * delayed sack is disabled for the entire association. Note
3746 * also that this field is mutually exclusive to
3747 * SPP_SACKDELAY_ENABLE, setting both will have undefined
3750 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
3751 char __user
*optval
, int __user
*optlen
)
3753 struct sctp_paddrparams params
;
3754 struct sctp_transport
*trans
= NULL
;
3755 struct sctp_association
*asoc
= NULL
;
3756 struct sctp_sock
*sp
= sctp_sk(sk
);
3758 if (len
< sizeof(struct sctp_paddrparams
))
3760 len
= sizeof(struct sctp_paddrparams
);
3761 if (copy_from_user(¶ms
, optval
, len
))
3764 /* If an address other than INADDR_ANY is specified, and
3765 * no transport is found, then the request is invalid.
3767 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
3768 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
3769 params
.spp_assoc_id
);
3771 SCTP_DEBUG_PRINTK("Failed no transport\n");
3776 /* Get association, if assoc_id != 0 and the socket is a one
3777 * to many style socket, and an association was not found, then
3778 * the id was invalid.
3780 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
3781 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
3782 SCTP_DEBUG_PRINTK("Failed no association\n");
3787 /* Fetch transport values. */
3788 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
3789 params
.spp_pathmtu
= trans
->pathmtu
;
3790 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
3791 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
3793 /*draft-11 doesn't say what to return in spp_flags*/
3794 params
.spp_flags
= trans
->param_flags
;
3796 /* Fetch association values. */
3797 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
3798 params
.spp_pathmtu
= asoc
->pathmtu
;
3799 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
3800 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
3802 /*draft-11 doesn't say what to return in spp_flags*/
3803 params
.spp_flags
= asoc
->param_flags
;
3805 /* Fetch socket values. */
3806 params
.spp_hbinterval
= sp
->hbinterval
;
3807 params
.spp_pathmtu
= sp
->pathmtu
;
3808 params
.spp_sackdelay
= sp
->sackdelay
;
3809 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
3811 /*draft-11 doesn't say what to return in spp_flags*/
3812 params
.spp_flags
= sp
->param_flags
;
3815 if (copy_to_user(optval
, ¶ms
, len
))
3818 if (put_user(len
, optlen
))
3824 /* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
3826 * This options will get or set the delayed ack timer. The time is set
3827 * in milliseconds. If the assoc_id is 0, then this sets or gets the
3828 * endpoints default delayed ack timer value. If the assoc_id field is
3829 * non-zero, then the set or get effects the specified association.
3831 * struct sctp_assoc_value {
3832 * sctp_assoc_t assoc_id;
3833 * uint32_t assoc_value;
3836 * assoc_id - This parameter, indicates which association the
3837 * user is preforming an action upon. Note that if
3838 * this field's value is zero then the endpoints
3839 * default value is changed (effecting future
3840 * associations only).
3842 * assoc_value - This parameter contains the number of milliseconds
3843 * that the user is requesting the delayed ACK timer
3844 * be set to. Note that this value is defined in
3845 * the standard to be between 200 and 500 milliseconds.
3847 * Note: a value of zero will leave the value alone,
3848 * but disable SACK delay. A non-zero value will also
3849 * enable SACK delay.
3851 static int sctp_getsockopt_delayed_ack_time(struct sock
*sk
, int len
,
3852 char __user
*optval
,
3855 struct sctp_assoc_value params
;
3856 struct sctp_association
*asoc
= NULL
;
3857 struct sctp_sock
*sp
= sctp_sk(sk
);
3859 if (len
< sizeof(struct sctp_assoc_value
))
3862 len
= sizeof(struct sctp_assoc_value
);
3864 if (copy_from_user(¶ms
, optval
, len
))
3867 /* Get association, if assoc_id != 0 and the socket is a one
3868 * to many style socket, and an association was not found, then
3869 * the id was invalid.
3871 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3872 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
3876 /* Fetch association values. */
3877 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
)
3878 params
.assoc_value
= jiffies_to_msecs(
3881 params
.assoc_value
= 0;
3883 /* Fetch socket values. */
3884 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
)
3885 params
.assoc_value
= sp
->sackdelay
;
3887 params
.assoc_value
= 0;
3890 if (copy_to_user(optval
, ¶ms
, len
))
3893 if (put_user(len
, optlen
))
3899 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
3901 * Applications can specify protocol parameters for the default association
3902 * initialization. The option name argument to setsockopt() and getsockopt()
3905 * Setting initialization parameters is effective only on an unconnected
3906 * socket (for UDP-style sockets only future associations are effected
3907 * by the change). With TCP-style sockets, this option is inherited by
3908 * sockets derived from a listener socket.
3910 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3912 if (len
< sizeof(struct sctp_initmsg
))
3914 len
= sizeof(struct sctp_initmsg
);
3915 if (put_user(len
, optlen
))
3917 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
3922 static int sctp_getsockopt_peer_addrs_num_old(struct sock
*sk
, int len
,
3923 char __user
*optval
,
3927 struct sctp_association
*asoc
;
3928 struct list_head
*pos
;
3931 if (len
< sizeof(sctp_assoc_t
))
3934 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
3937 /* For UDP-style sockets, id specifies the association to query. */
3938 asoc
= sctp_id2assoc(sk
, id
);
3942 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3950 * Old API for getting list of peer addresses. Does not work for 32-bit
3951 * programs running on a 64-bit kernel
3953 static int sctp_getsockopt_peer_addrs_old(struct sock
*sk
, int len
,
3954 char __user
*optval
,
3957 struct sctp_association
*asoc
;
3958 struct list_head
*pos
;
3960 struct sctp_getaddrs_old getaddrs
;
3961 struct sctp_transport
*from
;
3963 union sctp_addr temp
;
3964 struct sctp_sock
*sp
= sctp_sk(sk
);
3967 if (len
< sizeof(struct sctp_getaddrs_old
))
3970 len
= sizeof(struct sctp_getaddrs_old
);
3972 if (copy_from_user(&getaddrs
, optval
, len
))
3975 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
3977 /* For UDP-style sockets, id specifies the association to query. */
3978 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3982 to
= (void __user
*)getaddrs
.addrs
;
3983 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3984 from
= list_entry(pos
, struct sctp_transport
, transports
);
3985 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
3986 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3987 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3988 if (copy_to_user(to
, &temp
, addrlen
))
3992 if (cnt
>= getaddrs
.addr_num
) break;
3994 getaddrs
.addr_num
= cnt
;
3995 if (put_user(len
, optlen
))
3997 if (copy_to_user(optval
, &getaddrs
, len
))
4003 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4004 char __user
*optval
, int __user
*optlen
)
4006 struct sctp_association
*asoc
;
4007 struct list_head
*pos
;
4009 struct sctp_getaddrs getaddrs
;
4010 struct sctp_transport
*from
;
4012 union sctp_addr temp
;
4013 struct sctp_sock
*sp
= sctp_sk(sk
);
4018 if (len
< sizeof(struct sctp_getaddrs
))
4021 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4024 /* For UDP-style sockets, id specifies the association to query. */
4025 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4029 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4030 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4032 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4033 from
= list_entry(pos
, struct sctp_transport
, transports
);
4034 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4035 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4036 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
4037 if (space_left
< addrlen
)
4039 if (copy_to_user(to
, &temp
, addrlen
))
4043 space_left
-= addrlen
;
4046 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4048 bytes_copied
= ((char __user
*)to
) - optval
;
4049 if (put_user(bytes_copied
, optlen
))
4055 static int sctp_getsockopt_local_addrs_num_old(struct sock
*sk
, int len
,
4056 char __user
*optval
,
4060 struct sctp_bind_addr
*bp
;
4061 struct sctp_association
*asoc
;
4062 struct list_head
*pos
, *temp
;
4063 struct sctp_sockaddr_entry
*addr
;
4064 rwlock_t
*addr_lock
;
4067 if (len
< sizeof(sctp_assoc_t
))
4070 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
4074 * For UDP-style sockets, id specifies the association to query.
4075 * If the id field is set to the value '0' then the locally bound
4076 * addresses are returned without regard to any particular
4080 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4081 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4083 asoc
= sctp_id2assoc(sk
, id
);
4086 bp
= &asoc
->base
.bind_addr
;
4087 addr_lock
= &asoc
->base
.addr_lock
;
4090 sctp_read_lock(addr_lock
);
4092 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
4093 * addresses from the global local address list.
4095 if (sctp_list_single_entry(&bp
->address_list
)) {
4096 addr
= list_entry(bp
->address_list
.next
,
4097 struct sctp_sockaddr_entry
, list
);
4098 if (sctp_is_any(&addr
->a
)) {
4099 list_for_each_safe(pos
, temp
, &sctp_local_addr_list
) {
4100 addr
= list_entry(pos
,
4101 struct sctp_sockaddr_entry
,
4103 if ((PF_INET
== sk
->sk_family
) &&
4104 (AF_INET6
== addr
->a
.sa
.sa_family
))
4114 list_for_each(pos
, &bp
->address_list
) {
4119 sctp_read_unlock(addr_lock
);
4123 /* Helper function that copies local addresses to user and returns the number
4124 * of addresses copied.
4126 static int sctp_copy_laddrs_old(struct sock
*sk
, __u16 port
,
4127 int max_addrs
, void *to
,
4130 struct list_head
*pos
, *next
;
4131 struct sctp_sockaddr_entry
*addr
;
4132 union sctp_addr temp
;
4136 list_for_each_safe(pos
, next
, &sctp_local_addr_list
) {
4137 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4138 if ((PF_INET
== sk
->sk_family
) &&
4139 (AF_INET6
== addr
->a
.sa
.sa_family
))
4141 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4142 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4144 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4145 memcpy(to
, &temp
, addrlen
);
4148 *bytes_copied
+= addrlen
;
4150 if (cnt
>= max_addrs
) break;
4156 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4157 size_t space_left
, int *bytes_copied
)
4159 struct list_head
*pos
, *next
;
4160 struct sctp_sockaddr_entry
*addr
;
4161 union sctp_addr temp
;
4165 list_for_each_safe(pos
, next
, &sctp_local_addr_list
) {
4166 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4167 if ((PF_INET
== sk
->sk_family
) &&
4168 (AF_INET6
== addr
->a
.sa
.sa_family
))
4170 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4171 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4173 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4174 if (space_left
< addrlen
)
4176 memcpy(to
, &temp
, addrlen
);
4180 space_left
-= addrlen
;
4181 *bytes_copied
+= addrlen
;
4187 /* Old API for getting list of local addresses. Does not work for 32-bit
4188 * programs running on a 64-bit kernel
4190 static int sctp_getsockopt_local_addrs_old(struct sock
*sk
, int len
,
4191 char __user
*optval
, int __user
*optlen
)
4193 struct sctp_bind_addr
*bp
;
4194 struct sctp_association
*asoc
;
4195 struct list_head
*pos
;
4197 struct sctp_getaddrs_old getaddrs
;
4198 struct sctp_sockaddr_entry
*addr
;
4200 union sctp_addr temp
;
4201 struct sctp_sock
*sp
= sctp_sk(sk
);
4203 rwlock_t
*addr_lock
;
4207 int bytes_copied
= 0;
4209 if (len
< sizeof(struct sctp_getaddrs_old
))
4212 len
= sizeof(struct sctp_getaddrs_old
);
4213 if (copy_from_user(&getaddrs
, optval
, len
))
4216 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
4218 * For UDP-style sockets, id specifies the association to query.
4219 * If the id field is set to the value '0' then the locally bound
4220 * addresses are returned without regard to any particular
4223 if (0 == getaddrs
.assoc_id
) {
4224 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4225 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4227 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4230 bp
= &asoc
->base
.bind_addr
;
4231 addr_lock
= &asoc
->base
.addr_lock
;
4234 to
= getaddrs
.addrs
;
4236 /* Allocate space for a local instance of packed array to hold all
4237 * the data. We store addresses here first and then put write them
4238 * to the user in one shot.
4240 addrs
= kmalloc(sizeof(union sctp_addr
) * getaddrs
.addr_num
,
4245 sctp_read_lock(addr_lock
);
4247 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4248 * addresses from the global local address list.
4250 if (sctp_list_single_entry(&bp
->address_list
)) {
4251 addr
= list_entry(bp
->address_list
.next
,
4252 struct sctp_sockaddr_entry
, list
);
4253 if (sctp_is_any(&addr
->a
)) {
4254 cnt
= sctp_copy_laddrs_old(sk
, bp
->port
,
4256 addrs
, &bytes_copied
);
4262 list_for_each(pos
, &bp
->address_list
) {
4263 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4264 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4265 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4266 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4267 memcpy(buf
, &temp
, addrlen
);
4269 bytes_copied
+= addrlen
;
4271 if (cnt
>= getaddrs
.addr_num
) break;
4275 sctp_read_unlock(addr_lock
);
4277 /* copy the entire address list into the user provided space */
4278 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4283 /* copy the leading structure back to user */
4284 getaddrs
.addr_num
= cnt
;
4285 if (copy_to_user(optval
, &getaddrs
, len
))
4293 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4294 char __user
*optval
, int __user
*optlen
)
4296 struct sctp_bind_addr
*bp
;
4297 struct sctp_association
*asoc
;
4298 struct list_head
*pos
;
4300 struct sctp_getaddrs getaddrs
;
4301 struct sctp_sockaddr_entry
*addr
;
4303 union sctp_addr temp
;
4304 struct sctp_sock
*sp
= sctp_sk(sk
);
4306 rwlock_t
*addr_lock
;
4309 int bytes_copied
= 0;
4313 if (len
< sizeof(struct sctp_getaddrs
))
4316 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4320 * For UDP-style sockets, id specifies the association to query.
4321 * If the id field is set to the value '0' then the locally bound
4322 * addresses are returned without regard to any particular
4325 if (0 == getaddrs
.assoc_id
) {
4326 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4327 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4329 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4332 bp
= &asoc
->base
.bind_addr
;
4333 addr_lock
= &asoc
->base
.addr_lock
;
4336 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4337 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4339 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4343 sctp_read_lock(addr_lock
);
4345 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4346 * addresses from the global local address list.
4348 if (sctp_list_single_entry(&bp
->address_list
)) {
4349 addr
= list_entry(bp
->address_list
.next
,
4350 struct sctp_sockaddr_entry
, list
);
4351 if (sctp_is_any(&addr
->a
)) {
4352 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4353 space_left
, &bytes_copied
);
4363 list_for_each(pos
, &bp
->address_list
) {
4364 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4365 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4366 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4367 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4368 if (space_left
< addrlen
) {
4369 err
= -ENOMEM
; /*fixme: right error?*/
4372 memcpy(buf
, &temp
, addrlen
);
4374 bytes_copied
+= addrlen
;
4376 space_left
-= addrlen
;
4380 sctp_read_unlock(addr_lock
);
4382 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4386 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4390 if (put_user(bytes_copied
, optlen
))
4396 sctp_read_unlock(addr_lock
);
4403 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4405 * Requests that the local SCTP stack use the enclosed peer address as
4406 * the association primary. The enclosed address must be one of the
4407 * association peer's addresses.
4409 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4410 char __user
*optval
, int __user
*optlen
)
4412 struct sctp_prim prim
;
4413 struct sctp_association
*asoc
;
4414 struct sctp_sock
*sp
= sctp_sk(sk
);
4416 if (len
< sizeof(struct sctp_prim
))
4419 len
= sizeof(struct sctp_prim
);
4421 if (copy_from_user(&prim
, optval
, len
))
4424 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4428 if (!asoc
->peer
.primary_path
)
4431 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4432 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4434 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4435 (union sctp_addr
*)&prim
.ssp_addr
);
4437 if (put_user(len
, optlen
))
4439 if (copy_to_user(optval
, &prim
, len
))
4446 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4448 * Requests that the local endpoint set the specified Adaptation Layer
4449 * Indication parameter for all future INIT and INIT-ACK exchanges.
4451 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4452 char __user
*optval
, int __user
*optlen
)
4454 struct sctp_setadaptation adaptation
;
4456 if (len
< sizeof(struct sctp_setadaptation
))
4459 len
= sizeof(struct sctp_setadaptation
);
4461 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4463 if (put_user(len
, optlen
))
4465 if (copy_to_user(optval
, &adaptation
, len
))
4473 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4475 * Applications that wish to use the sendto() system call may wish to
4476 * specify a default set of parameters that would normally be supplied
4477 * through the inclusion of ancillary data. This socket option allows
4478 * such an application to set the default sctp_sndrcvinfo structure.
4481 * The application that wishes to use this socket option simply passes
4482 * in to this call the sctp_sndrcvinfo structure defined in Section
4483 * 5.2.2) The input parameters accepted by this call include
4484 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4485 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4486 * to this call if the caller is using the UDP model.
4488 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4490 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4491 int len
, char __user
*optval
,
4494 struct sctp_sndrcvinfo info
;
4495 struct sctp_association
*asoc
;
4496 struct sctp_sock
*sp
= sctp_sk(sk
);
4498 if (len
< sizeof(struct sctp_sndrcvinfo
))
4501 len
= sizeof(struct sctp_sndrcvinfo
);
4503 if (copy_from_user(&info
, optval
, len
))
4506 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4507 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4511 info
.sinfo_stream
= asoc
->default_stream
;
4512 info
.sinfo_flags
= asoc
->default_flags
;
4513 info
.sinfo_ppid
= asoc
->default_ppid
;
4514 info
.sinfo_context
= asoc
->default_context
;
4515 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4517 info
.sinfo_stream
= sp
->default_stream
;
4518 info
.sinfo_flags
= sp
->default_flags
;
4519 info
.sinfo_ppid
= sp
->default_ppid
;
4520 info
.sinfo_context
= sp
->default_context
;
4521 info
.sinfo_timetolive
= sp
->default_timetolive
;
4524 if (put_user(len
, optlen
))
4526 if (copy_to_user(optval
, &info
, len
))
4534 * 7.1.5 SCTP_NODELAY
4536 * Turn on/off any Nagle-like algorithm. This means that packets are
4537 * generally sent as soon as possible and no unnecessary delays are
4538 * introduced, at the cost of more packets in the network. Expects an
4539 * integer boolean flag.
4542 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4543 char __user
*optval
, int __user
*optlen
)
4547 if (len
< sizeof(int))
4551 val
= (sctp_sk(sk
)->nodelay
== 1);
4552 if (put_user(len
, optlen
))
4554 if (copy_to_user(optval
, &val
, len
))
4561 * 7.1.1 SCTP_RTOINFO
4563 * The protocol parameters used to initialize and bound retransmission
4564 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4565 * and modify these parameters.
4566 * All parameters are time values, in milliseconds. A value of 0, when
4567 * modifying the parameters, indicates that the current value should not
4571 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4572 char __user
*optval
,
4573 int __user
*optlen
) {
4574 struct sctp_rtoinfo rtoinfo
;
4575 struct sctp_association
*asoc
;
4577 if (len
< sizeof (struct sctp_rtoinfo
))
4580 len
= sizeof(struct sctp_rtoinfo
);
4582 if (copy_from_user(&rtoinfo
, optval
, len
))
4585 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4587 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4590 /* Values corresponding to the specific association. */
4592 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4593 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4594 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4596 /* Values corresponding to the endpoint. */
4597 struct sctp_sock
*sp
= sctp_sk(sk
);
4599 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4600 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4601 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4604 if (put_user(len
, optlen
))
4607 if (copy_to_user(optval
, &rtoinfo
, len
))
4615 * 7.1.2 SCTP_ASSOCINFO
4617 * This option is used to tune the maximum retransmission attempts
4618 * of the association.
4619 * Returns an error if the new association retransmission value is
4620 * greater than the sum of the retransmission value of the peer.
4621 * See [SCTP] for more information.
4624 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4625 char __user
*optval
,
4629 struct sctp_assocparams assocparams
;
4630 struct sctp_association
*asoc
;
4631 struct list_head
*pos
;
4634 if (len
< sizeof (struct sctp_assocparams
))
4637 len
= sizeof(struct sctp_assocparams
);
4639 if (copy_from_user(&assocparams
, optval
, len
))
4642 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4644 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4647 /* Values correspoinding to the specific association */
4649 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4650 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4651 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4652 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4654 (asoc
->cookie_life
.tv_usec
4657 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4661 assocparams
.sasoc_number_peer_destinations
= cnt
;
4663 /* Values corresponding to the endpoint */
4664 struct sctp_sock
*sp
= sctp_sk(sk
);
4666 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4667 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4668 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4669 assocparams
.sasoc_cookie_life
=
4670 sp
->assocparams
.sasoc_cookie_life
;
4671 assocparams
.sasoc_number_peer_destinations
=
4673 sasoc_number_peer_destinations
;
4676 if (put_user(len
, optlen
))
4679 if (copy_to_user(optval
, &assocparams
, len
))
4686 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4688 * This socket option is a boolean flag which turns on or off mapped V4
4689 * addresses. If this option is turned on and the socket is type
4690 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4691 * If this option is turned off, then no mapping will be done of V4
4692 * addresses and a user will receive both PF_INET6 and PF_INET type
4693 * addresses on the socket.
4695 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
4696 char __user
*optval
, int __user
*optlen
)
4699 struct sctp_sock
*sp
= sctp_sk(sk
);
4701 if (len
< sizeof(int))
4706 if (put_user(len
, optlen
))
4708 if (copy_to_user(optval
, &val
, len
))
4715 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
4716 * (chapter and verse is quoted at sctp_setsockopt_context())
4718 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
4719 char __user
*optval
, int __user
*optlen
)
4721 struct sctp_assoc_value params
;
4722 struct sctp_sock
*sp
;
4723 struct sctp_association
*asoc
;
4725 if (len
< sizeof(struct sctp_assoc_value
))
4728 len
= sizeof(struct sctp_assoc_value
);
4730 if (copy_from_user(¶ms
, optval
, len
))
4735 if (params
.assoc_id
!= 0) {
4736 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4739 params
.assoc_value
= asoc
->default_rcv_context
;
4741 params
.assoc_value
= sp
->default_rcv_context
;
4744 if (put_user(len
, optlen
))
4746 if (copy_to_user(optval
, ¶ms
, len
))
4753 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
4755 * This socket option specifies the maximum size to put in any outgoing
4756 * SCTP chunk. If a message is larger than this size it will be
4757 * fragmented by SCTP into the specified size. Note that the underlying
4758 * SCTP implementation may fragment into smaller sized chunks when the
4759 * PMTU of the underlying association is smaller than the value set by
4762 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
4763 char __user
*optval
, int __user
*optlen
)
4767 if (len
< sizeof(int))
4772 val
= sctp_sk(sk
)->user_frag
;
4773 if (put_user(len
, optlen
))
4775 if (copy_to_user(optval
, &val
, len
))
4782 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
4783 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
4785 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
4786 char __user
*optval
, int __user
*optlen
)
4790 if (len
< sizeof(int))
4795 val
= sctp_sk(sk
)->frag_interleave
;
4796 if (put_user(len
, optlen
))
4798 if (copy_to_user(optval
, &val
, len
))
4805 * 7.1.25. Set or Get the sctp partial delivery point
4806 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
4808 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
4809 char __user
*optval
,
4814 if (len
< sizeof(u32
))
4819 val
= sctp_sk(sk
)->pd_point
;
4820 if (put_user(len
, optlen
))
4822 if (copy_to_user(optval
, &val
, len
))
4829 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
4830 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
4832 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
4833 char __user
*optval
,
4838 if (len
< sizeof(int))
4843 val
= sctp_sk(sk
)->max_burst
;
4844 if (put_user(len
, optlen
))
4846 if (copy_to_user(optval
, &val
, len
))
4852 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
4853 char __user
*optval
, int __user
*optlen
)
4858 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
4861 /* I can hardly begin to describe how wrong this is. This is
4862 * so broken as to be worse than useless. The API draft
4863 * REALLY is NOT helpful here... I am not convinced that the
4864 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
4865 * are at all well-founded.
4867 if (level
!= SOL_SCTP
) {
4868 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
4870 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
4874 if (get_user(len
, optlen
))
4881 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
4883 case SCTP_DISABLE_FRAGMENTS
:
4884 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
4888 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
4890 case SCTP_AUTOCLOSE
:
4891 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
4893 case SCTP_SOCKOPT_PEELOFF
:
4894 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
4896 case SCTP_PEER_ADDR_PARAMS
:
4897 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
4900 case SCTP_DELAYED_ACK_TIME
:
4901 retval
= sctp_getsockopt_delayed_ack_time(sk
, len
, optval
,
4905 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
4907 case SCTP_GET_PEER_ADDRS_NUM_OLD
:
4908 retval
= sctp_getsockopt_peer_addrs_num_old(sk
, len
, optval
,
4911 case SCTP_GET_LOCAL_ADDRS_NUM_OLD
:
4912 retval
= sctp_getsockopt_local_addrs_num_old(sk
, len
, optval
,
4915 case SCTP_GET_PEER_ADDRS_OLD
:
4916 retval
= sctp_getsockopt_peer_addrs_old(sk
, len
, optval
,
4919 case SCTP_GET_LOCAL_ADDRS_OLD
:
4920 retval
= sctp_getsockopt_local_addrs_old(sk
, len
, optval
,
4923 case SCTP_GET_PEER_ADDRS
:
4924 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
4927 case SCTP_GET_LOCAL_ADDRS
:
4928 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
4931 case SCTP_DEFAULT_SEND_PARAM
:
4932 retval
= sctp_getsockopt_default_send_param(sk
, len
,
4935 case SCTP_PRIMARY_ADDR
:
4936 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
4939 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
4942 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
4944 case SCTP_ASSOCINFO
:
4945 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
4947 case SCTP_I_WANT_MAPPED_V4_ADDR
:
4948 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
4951 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
4953 case SCTP_GET_PEER_ADDR_INFO
:
4954 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
4957 case SCTP_ADAPTATION_LAYER
:
4958 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
4962 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
4964 case SCTP_FRAGMENT_INTERLEAVE
:
4965 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
4968 case SCTP_PARTIAL_DELIVERY_POINT
:
4969 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
4972 case SCTP_MAX_BURST
:
4973 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
4976 retval
= -ENOPROTOOPT
;
4980 sctp_release_sock(sk
);
4984 static void sctp_hash(struct sock
*sk
)
4989 static void sctp_unhash(struct sock
*sk
)
4994 /* Check if port is acceptable. Possibly find first available port.
4996 * The port hash table (contained in the 'global' SCTP protocol storage
4997 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
4998 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
4999 * list (the list number is the port number hashed out, so as you
5000 * would expect from a hash function, all the ports in a given list have
5001 * such a number that hashes out to the same list number; you were
5002 * expecting that, right?); so each list has a set of ports, with a
5003 * link to the socket (struct sock) that uses it, the port number and
5004 * a fastreuse flag (FIXME: NPI ipg).
5006 static struct sctp_bind_bucket
*sctp_bucket_create(
5007 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
5009 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
5011 struct sctp_bind_hashbucket
*head
; /* hash list */
5012 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5013 unsigned short snum
;
5016 snum
= ntohs(addr
->v4
.sin_port
);
5018 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
5019 sctp_local_bh_disable();
5022 /* Search for an available port.
5024 * 'sctp_port_rover' was the last port assigned, so
5025 * we start to search from 'sctp_port_rover +
5026 * 1'. What we do is first check if port 'rover' is
5027 * already in the hash table; if not, we use that; if
5028 * it is, we try next.
5030 int low
= sysctl_local_port_range
[0];
5031 int high
= sysctl_local_port_range
[1];
5032 int remaining
= (high
- low
) + 1;
5036 sctp_spin_lock(&sctp_port_alloc_lock
);
5037 rover
= sctp_port_rover
;
5040 if ((rover
< low
) || (rover
> high
))
5042 index
= sctp_phashfn(rover
);
5043 head
= &sctp_port_hashtable
[index
];
5044 sctp_spin_lock(&head
->lock
);
5045 for (pp
= head
->chain
; pp
; pp
= pp
->next
)
5046 if (pp
->port
== rover
)
5050 sctp_spin_unlock(&head
->lock
);
5051 } while (--remaining
> 0);
5052 sctp_port_rover
= rover
;
5053 sctp_spin_unlock(&sctp_port_alloc_lock
);
5055 /* Exhausted local port range during search? */
5060 /* OK, here is the one we will use. HEAD (the port
5061 * hash table list entry) is non-NULL and we hold it's
5066 /* We are given an specific port number; we verify
5067 * that it is not being used. If it is used, we will
5068 * exahust the search in the hash list corresponding
5069 * to the port number (snum) - we detect that with the
5070 * port iterator, pp being NULL.
5072 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
5073 sctp_spin_lock(&head
->lock
);
5074 for (pp
= head
->chain
; pp
; pp
= pp
->next
) {
5075 if (pp
->port
== snum
)
5082 if (!hlist_empty(&pp
->owner
)) {
5083 /* We had a port hash table hit - there is an
5084 * available port (pp != NULL) and it is being
5085 * used by other socket (pp->owner not empty); that other
5086 * socket is going to be sk2.
5088 int reuse
= sk
->sk_reuse
;
5090 struct hlist_node
*node
;
5092 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5093 if (pp
->fastreuse
&& sk
->sk_reuse
&&
5094 sk
->sk_state
!= SCTP_SS_LISTENING
)
5097 /* Run through the list of sockets bound to the port
5098 * (pp->port) [via the pointers bind_next and
5099 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5100 * we get the endpoint they describe and run through
5101 * the endpoint's list of IP (v4 or v6) addresses,
5102 * comparing each of the addresses with the address of
5103 * the socket sk. If we find a match, then that means
5104 * that this port/socket (sk) combination are already
5107 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
5108 struct sctp_endpoint
*ep2
;
5109 ep2
= sctp_sk(sk2
)->ep
;
5111 if (reuse
&& sk2
->sk_reuse
&&
5112 sk2
->sk_state
!= SCTP_SS_LISTENING
)
5115 if (sctp_bind_addr_match(&ep2
->base
.bind_addr
, addr
,
5121 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5124 /* If there was a hash table miss, create a new port. */
5126 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
5129 /* In either case (hit or miss), make sure fastreuse is 1 only
5130 * if sk->sk_reuse is too (that is, if the caller requested
5131 * SO_REUSEADDR on this socket -sk-).
5133 if (hlist_empty(&pp
->owner
)) {
5134 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
5138 } else if (pp
->fastreuse
&&
5139 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
5142 /* We are set, so fill up all the data in the hash table
5143 * entry, tie the socket list information with the rest of the
5144 * sockets FIXME: Blurry, NPI (ipg).
5147 if (!sctp_sk(sk
)->bind_hash
) {
5148 inet_sk(sk
)->num
= snum
;
5149 sk_add_bind_node(sk
, &pp
->owner
);
5150 sctp_sk(sk
)->bind_hash
= pp
;
5155 sctp_spin_unlock(&head
->lock
);
5158 sctp_local_bh_enable();
5162 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5163 * port is requested.
5165 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
5168 union sctp_addr addr
;
5169 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5171 /* Set up a dummy address struct from the sk. */
5172 af
->from_sk(&addr
, sk
);
5173 addr
.v4
.sin_port
= htons(snum
);
5175 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5176 ret
= sctp_get_port_local(sk
, &addr
);
5178 return (ret
? 1 : 0);
5182 * 3.1.3 listen() - UDP Style Syntax
5184 * By default, new associations are not accepted for UDP style sockets.
5185 * An application uses listen() to mark a socket as being able to
5186 * accept new associations.
5188 SCTP_STATIC
int sctp_seqpacket_listen(struct sock
*sk
, int backlog
)
5190 struct sctp_sock
*sp
= sctp_sk(sk
);
5191 struct sctp_endpoint
*ep
= sp
->ep
;
5193 /* Only UDP style sockets that are not peeled off are allowed to
5196 if (!sctp_style(sk
, UDP
))
5199 /* If backlog is zero, disable listening. */
5201 if (sctp_sstate(sk
, CLOSED
))
5204 sctp_unhash_endpoint(ep
);
5205 sk
->sk_state
= SCTP_SS_CLOSED
;
5209 /* Return if we are already listening. */
5210 if (sctp_sstate(sk
, LISTENING
))
5214 * If a bind() or sctp_bindx() is not called prior to a listen()
5215 * call that allows new associations to be accepted, the system
5216 * picks an ephemeral port and will choose an address set equivalent
5217 * to binding with a wildcard address.
5219 * This is not currently spelled out in the SCTP sockets
5220 * extensions draft, but follows the practice as seen in TCP
5223 * Additionally, turn off fastreuse flag since we are not listening
5225 sk
->sk_state
= SCTP_SS_LISTENING
;
5226 if (!ep
->base
.bind_addr
.port
) {
5227 if (sctp_autobind(sk
))
5230 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5232 sctp_hash_endpoint(ep
);
5237 * 4.1.3 listen() - TCP Style Syntax
5239 * Applications uses listen() to ready the SCTP endpoint for accepting
5240 * inbound associations.
5242 SCTP_STATIC
int sctp_stream_listen(struct sock
*sk
, int backlog
)
5244 struct sctp_sock
*sp
= sctp_sk(sk
);
5245 struct sctp_endpoint
*ep
= sp
->ep
;
5247 /* If backlog is zero, disable listening. */
5249 if (sctp_sstate(sk
, CLOSED
))
5252 sctp_unhash_endpoint(ep
);
5253 sk
->sk_state
= SCTP_SS_CLOSED
;
5257 if (sctp_sstate(sk
, LISTENING
))
5261 * If a bind() or sctp_bindx() is not called prior to a listen()
5262 * call that allows new associations to be accepted, the system
5263 * picks an ephemeral port and will choose an address set equivalent
5264 * to binding with a wildcard address.
5266 * This is not currently spelled out in the SCTP sockets
5267 * extensions draft, but follows the practice as seen in TCP
5270 sk
->sk_state
= SCTP_SS_LISTENING
;
5271 if (!ep
->base
.bind_addr
.port
) {
5272 if (sctp_autobind(sk
))
5275 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5277 sk
->sk_max_ack_backlog
= backlog
;
5278 sctp_hash_endpoint(ep
);
5283 * Move a socket to LISTENING state.
5285 int sctp_inet_listen(struct socket
*sock
, int backlog
)
5287 struct sock
*sk
= sock
->sk
;
5288 struct crypto_hash
*tfm
= NULL
;
5291 if (unlikely(backlog
< 0))
5296 if (sock
->state
!= SS_UNCONNECTED
)
5299 /* Allocate HMAC for generating cookie. */
5300 if (sctp_hmac_alg
) {
5301 tfm
= crypto_alloc_hash(sctp_hmac_alg
, 0, CRYPTO_ALG_ASYNC
);
5303 if (net_ratelimit()) {
5305 "SCTP: failed to load transform for %s: %ld\n",
5306 sctp_hmac_alg
, PTR_ERR(tfm
));
5313 switch (sock
->type
) {
5314 case SOCK_SEQPACKET
:
5315 err
= sctp_seqpacket_listen(sk
, backlog
);
5318 err
= sctp_stream_listen(sk
, backlog
);
5327 /* Store away the transform reference. */
5328 sctp_sk(sk
)->hmac
= tfm
;
5330 sctp_release_sock(sk
);
5333 crypto_free_hash(tfm
);
5338 * This function is done by modeling the current datagram_poll() and the
5339 * tcp_poll(). Note that, based on these implementations, we don't
5340 * lock the socket in this function, even though it seems that,
5341 * ideally, locking or some other mechanisms can be used to ensure
5342 * the integrity of the counters (sndbuf and wmem_alloc) used
5343 * in this place. We assume that we don't need locks either until proven
5346 * Another thing to note is that we include the Async I/O support
5347 * here, again, by modeling the current TCP/UDP code. We don't have
5348 * a good way to test with it yet.
5350 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
5352 struct sock
*sk
= sock
->sk
;
5353 struct sctp_sock
*sp
= sctp_sk(sk
);
5356 poll_wait(file
, sk
->sk_sleep
, wait
);
5358 /* A TCP-style listening socket becomes readable when the accept queue
5361 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
5362 return (!list_empty(&sp
->ep
->asocs
)) ?
5363 (POLLIN
| POLLRDNORM
) : 0;
5367 /* Is there any exceptional events? */
5368 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
5370 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5372 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
5375 /* Is it readable? Reconsider this code with TCP-style support. */
5376 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
5377 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
5378 mask
|= POLLIN
| POLLRDNORM
;
5380 /* The association is either gone or not ready. */
5381 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
5384 /* Is it writable? */
5385 if (sctp_writeable(sk
)) {
5386 mask
|= POLLOUT
| POLLWRNORM
;
5388 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
5390 * Since the socket is not locked, the buffer
5391 * might be made available after the writeable check and
5392 * before the bit is set. This could cause a lost I/O
5393 * signal. tcp_poll() has a race breaker for this race
5394 * condition. Based on their implementation, we put
5395 * in the following code to cover it as well.
5397 if (sctp_writeable(sk
))
5398 mask
|= POLLOUT
| POLLWRNORM
;
5403 /********************************************************************
5404 * 2nd Level Abstractions
5405 ********************************************************************/
5407 static struct sctp_bind_bucket
*sctp_bucket_create(
5408 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
5410 struct sctp_bind_bucket
*pp
;
5412 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
5413 SCTP_DBG_OBJCNT_INC(bind_bucket
);
5417 INIT_HLIST_HEAD(&pp
->owner
);
5418 if ((pp
->next
= head
->chain
) != NULL
)
5419 pp
->next
->pprev
= &pp
->next
;
5421 pp
->pprev
= &head
->chain
;
5426 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5427 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
5429 if (pp
&& hlist_empty(&pp
->owner
)) {
5431 pp
->next
->pprev
= pp
->pprev
;
5432 *(pp
->pprev
) = pp
->next
;
5433 kmem_cache_free(sctp_bucket_cachep
, pp
);
5434 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
5438 /* Release this socket's reference to a local port. */
5439 static inline void __sctp_put_port(struct sock
*sk
)
5441 struct sctp_bind_hashbucket
*head
=
5442 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->num
)];
5443 struct sctp_bind_bucket
*pp
;
5445 sctp_spin_lock(&head
->lock
);
5446 pp
= sctp_sk(sk
)->bind_hash
;
5447 __sk_del_bind_node(sk
);
5448 sctp_sk(sk
)->bind_hash
= NULL
;
5449 inet_sk(sk
)->num
= 0;
5450 sctp_bucket_destroy(pp
);
5451 sctp_spin_unlock(&head
->lock
);
5454 void sctp_put_port(struct sock
*sk
)
5456 sctp_local_bh_disable();
5457 __sctp_put_port(sk
);
5458 sctp_local_bh_enable();
5462 * The system picks an ephemeral port and choose an address set equivalent
5463 * to binding with a wildcard address.
5464 * One of those addresses will be the primary address for the association.
5465 * This automatically enables the multihoming capability of SCTP.
5467 static int sctp_autobind(struct sock
*sk
)
5469 union sctp_addr autoaddr
;
5473 /* Initialize a local sockaddr structure to INADDR_ANY. */
5474 af
= sctp_sk(sk
)->pf
->af
;
5476 port
= htons(inet_sk(sk
)->num
);
5477 af
->inaddr_any(&autoaddr
, port
);
5479 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5482 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5485 * 4.2 The cmsghdr Structure *
5487 * When ancillary data is sent or received, any number of ancillary data
5488 * objects can be specified by the msg_control and msg_controllen members of
5489 * the msghdr structure, because each object is preceded by
5490 * a cmsghdr structure defining the object's length (the cmsg_len member).
5491 * Historically Berkeley-derived implementations have passed only one object
5492 * at a time, but this API allows multiple objects to be
5493 * passed in a single call to sendmsg() or recvmsg(). The following example
5494 * shows two ancillary data objects in a control buffer.
5496 * |<--------------------------- msg_controllen -------------------------->|
5499 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5501 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5504 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5506 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5509 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5510 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5512 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5514 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5521 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
5522 sctp_cmsgs_t
*cmsgs
)
5524 struct cmsghdr
*cmsg
;
5526 for (cmsg
= CMSG_FIRSTHDR(msg
);
5528 cmsg
= CMSG_NXTHDR((struct msghdr
*)msg
, cmsg
)) {
5529 if (!CMSG_OK(msg
, cmsg
))
5532 /* Should we parse this header or ignore? */
5533 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
5536 /* Strictly check lengths following example in SCM code. */
5537 switch (cmsg
->cmsg_type
) {
5539 /* SCTP Socket API Extension
5540 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5542 * This cmsghdr structure provides information for
5543 * initializing new SCTP associations with sendmsg().
5544 * The SCTP_INITMSG socket option uses this same data
5545 * structure. This structure is not used for
5548 * cmsg_level cmsg_type cmsg_data[]
5549 * ------------ ------------ ----------------------
5550 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5552 if (cmsg
->cmsg_len
!=
5553 CMSG_LEN(sizeof(struct sctp_initmsg
)))
5555 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
5559 /* SCTP Socket API Extension
5560 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5562 * This cmsghdr structure specifies SCTP options for
5563 * sendmsg() and describes SCTP header information
5564 * about a received message through recvmsg().
5566 * cmsg_level cmsg_type cmsg_data[]
5567 * ------------ ------------ ----------------------
5568 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5570 if (cmsg
->cmsg_len
!=
5571 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
5575 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
5577 /* Minimally, validate the sinfo_flags. */
5578 if (cmsgs
->info
->sinfo_flags
&
5579 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
5580 SCTP_ABORT
| SCTP_EOF
))
5592 * Wait for a packet..
5593 * Note: This function is the same function as in core/datagram.c
5594 * with a few modifications to make lksctp work.
5596 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
5601 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5603 /* Socket errors? */
5604 error
= sock_error(sk
);
5608 if (!skb_queue_empty(&sk
->sk_receive_queue
))
5611 /* Socket shut down? */
5612 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5615 /* Sequenced packets can come disconnected. If so we report the
5620 /* Is there a good reason to think that we may receive some data? */
5621 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
5624 /* Handle signals. */
5625 if (signal_pending(current
))
5628 /* Let another process have a go. Since we are going to sleep
5629 * anyway. Note: This may cause odd behaviors if the message
5630 * does not fit in the user's buffer, but this seems to be the
5631 * only way to honor MSG_DONTWAIT realistically.
5633 sctp_release_sock(sk
);
5634 *timeo_p
= schedule_timeout(*timeo_p
);
5638 finish_wait(sk
->sk_sleep
, &wait
);
5642 error
= sock_intr_errno(*timeo_p
);
5645 finish_wait(sk
->sk_sleep
, &wait
);
5650 /* Receive a datagram.
5651 * Note: This is pretty much the same routine as in core/datagram.c
5652 * with a few changes to make lksctp work.
5654 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
5655 int noblock
, int *err
)
5658 struct sk_buff
*skb
;
5661 timeo
= sock_rcvtimeo(sk
, noblock
);
5663 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
5664 timeo
, MAX_SCHEDULE_TIMEOUT
);
5667 /* Again only user level code calls this function,
5668 * so nothing interrupt level
5669 * will suddenly eat the receive_queue.
5671 * Look at current nfs client by the way...
5672 * However, this function was corrent in any case. 8)
5674 if (flags
& MSG_PEEK
) {
5675 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
5676 skb
= skb_peek(&sk
->sk_receive_queue
);
5678 atomic_inc(&skb
->users
);
5679 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
5681 skb
= skb_dequeue(&sk
->sk_receive_queue
);
5687 /* Caller is allowed not to check sk->sk_err before calling. */
5688 error
= sock_error(sk
);
5692 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5695 /* User doesn't want to wait. */
5699 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
5708 /* If sndbuf has changed, wake up per association sndbuf waiters. */
5709 static void __sctp_write_space(struct sctp_association
*asoc
)
5711 struct sock
*sk
= asoc
->base
.sk
;
5712 struct socket
*sock
= sk
->sk_socket
;
5714 if ((sctp_wspace(asoc
) > 0) && sock
) {
5715 if (waitqueue_active(&asoc
->wait
))
5716 wake_up_interruptible(&asoc
->wait
);
5718 if (sctp_writeable(sk
)) {
5719 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
5720 wake_up_interruptible(sk
->sk_sleep
);
5722 /* Note that we try to include the Async I/O support
5723 * here by modeling from the current TCP/UDP code.
5724 * We have not tested with it yet.
5726 if (sock
->fasync_list
&&
5727 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
5728 sock_wake_async(sock
, 2, POLL_OUT
);
5733 /* Do accounting for the sndbuf space.
5734 * Decrement the used sndbuf space of the corresponding association by the
5735 * data size which was just transmitted(freed).
5737 static void sctp_wfree(struct sk_buff
*skb
)
5739 struct sctp_association
*asoc
;
5740 struct sctp_chunk
*chunk
;
5743 /* Get the saved chunk pointer. */
5744 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
5747 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
5748 sizeof(struct sk_buff
) +
5749 sizeof(struct sctp_chunk
);
5751 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
5754 __sctp_write_space(asoc
);
5756 sctp_association_put(asoc
);
5759 /* Do accounting for the receive space on the socket.
5760 * Accounting for the association is done in ulpevent.c
5761 * We set this as a destructor for the cloned data skbs so that
5762 * accounting is done at the correct time.
5764 void sctp_sock_rfree(struct sk_buff
*skb
)
5766 struct sock
*sk
= skb
->sk
;
5767 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
5769 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
5773 /* Helper function to wait for space in the sndbuf. */
5774 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
5777 struct sock
*sk
= asoc
->base
.sk
;
5779 long current_timeo
= *timeo_p
;
5782 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
5783 asoc
, (long)(*timeo_p
), msg_len
);
5785 /* Increment the association's refcnt. */
5786 sctp_association_hold(asoc
);
5788 /* Wait on the association specific sndbuf space. */
5790 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
5791 TASK_INTERRUPTIBLE
);
5794 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
5797 if (signal_pending(current
))
5798 goto do_interrupted
;
5799 if (msg_len
<= sctp_wspace(asoc
))
5802 /* Let another process have a go. Since we are going
5805 sctp_release_sock(sk
);
5806 current_timeo
= schedule_timeout(current_timeo
);
5807 BUG_ON(sk
!= asoc
->base
.sk
);
5810 *timeo_p
= current_timeo
;
5814 finish_wait(&asoc
->wait
, &wait
);
5816 /* Release the association's refcnt. */
5817 sctp_association_put(asoc
);
5826 err
= sock_intr_errno(*timeo_p
);
5834 /* If socket sndbuf has changed, wake up all per association waiters. */
5835 void sctp_write_space(struct sock
*sk
)
5837 struct sctp_association
*asoc
;
5838 struct list_head
*pos
;
5840 /* Wake up the tasks in each wait queue. */
5841 list_for_each(pos
, &((sctp_sk(sk
))->ep
->asocs
)) {
5842 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
5843 __sctp_write_space(asoc
);
5847 /* Is there any sndbuf space available on the socket?
5849 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
5850 * associations on the same socket. For a UDP-style socket with
5851 * multiple associations, it is possible for it to be "unwriteable"
5852 * prematurely. I assume that this is acceptable because
5853 * a premature "unwriteable" is better than an accidental "writeable" which
5854 * would cause an unwanted block under certain circumstances. For the 1-1
5855 * UDP-style sockets or TCP-style sockets, this code should work.
5858 static int sctp_writeable(struct sock
*sk
)
5862 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
5868 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
5869 * returns immediately with EINPROGRESS.
5871 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
5873 struct sock
*sk
= asoc
->base
.sk
;
5875 long current_timeo
= *timeo_p
;
5878 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __FUNCTION__
, asoc
,
5881 /* Increment the association's refcnt. */
5882 sctp_association_hold(asoc
);
5885 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
5886 TASK_INTERRUPTIBLE
);
5889 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5891 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
5894 if (signal_pending(current
))
5895 goto do_interrupted
;
5897 if (sctp_state(asoc
, ESTABLISHED
))
5900 /* Let another process have a go. Since we are going
5903 sctp_release_sock(sk
);
5904 current_timeo
= schedule_timeout(current_timeo
);
5907 *timeo_p
= current_timeo
;
5911 finish_wait(&asoc
->wait
, &wait
);
5913 /* Release the association's refcnt. */
5914 sctp_association_put(asoc
);
5919 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
5922 err
= -ECONNREFUSED
;
5926 err
= sock_intr_errno(*timeo_p
);
5934 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
5936 struct sctp_endpoint
*ep
;
5940 ep
= sctp_sk(sk
)->ep
;
5944 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
,
5945 TASK_INTERRUPTIBLE
);
5947 if (list_empty(&ep
->asocs
)) {
5948 sctp_release_sock(sk
);
5949 timeo
= schedule_timeout(timeo
);
5954 if (!sctp_sstate(sk
, LISTENING
))
5958 if (!list_empty(&ep
->asocs
))
5961 err
= sock_intr_errno(timeo
);
5962 if (signal_pending(current
))
5970 finish_wait(sk
->sk_sleep
, &wait
);
5975 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
5980 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5981 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
5983 sctp_release_sock(sk
);
5984 timeout
= schedule_timeout(timeout
);
5986 } while (!signal_pending(current
) && timeout
);
5988 finish_wait(sk
->sk_sleep
, &wait
);
5991 static void sctp_sock_rfree_frag(struct sk_buff
*skb
)
5993 struct sk_buff
*frag
;
5998 /* Don't forget the fragments. */
5999 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
6000 sctp_sock_rfree_frag(frag
);
6003 sctp_sock_rfree(skb
);
6006 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
6008 struct sk_buff
*frag
;
6013 /* Don't forget the fragments. */
6014 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
6015 sctp_skb_set_owner_r_frag(frag
, sk
);
6018 sctp_skb_set_owner_r(skb
, sk
);
6021 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6022 * and its messages to the newsk.
6024 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
6025 struct sctp_association
*assoc
,
6026 sctp_socket_type_t type
)
6028 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
6029 struct sctp_sock
*newsp
= sctp_sk(newsk
);
6030 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
6031 struct sctp_endpoint
*newep
= newsp
->ep
;
6032 struct sk_buff
*skb
, *tmp
;
6033 struct sctp_ulpevent
*event
;
6036 /* Migrate socket buffer sizes and all the socket level options to the
6039 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
6040 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
6041 /* Brute force copy old sctp opt. */
6042 inet_sk_copy_descendant(newsk
, oldsk
);
6044 /* Restore the ep value that was overwritten with the above structure
6050 /* Hook this new socket in to the bind_hash list. */
6051 pp
= sctp_sk(oldsk
)->bind_hash
;
6052 sk_add_bind_node(newsk
, &pp
->owner
);
6053 sctp_sk(newsk
)->bind_hash
= pp
;
6054 inet_sk(newsk
)->num
= inet_sk(oldsk
)->num
;
6056 /* Copy the bind_addr list from the original endpoint to the new
6057 * endpoint so that we can handle restarts properly
6059 if (PF_INET6
== assoc
->base
.sk
->sk_family
)
6060 flags
= SCTP_ADDR6_ALLOWED
;
6061 if (assoc
->peer
.ipv4_address
)
6062 flags
|= SCTP_ADDR4_PEERSUPP
;
6063 if (assoc
->peer
.ipv6_address
)
6064 flags
|= SCTP_ADDR6_PEERSUPP
;
6065 sctp_bind_addr_copy(&newsp
->ep
->base
.bind_addr
,
6066 &oldsp
->ep
->base
.bind_addr
,
6067 SCTP_SCOPE_GLOBAL
, GFP_KERNEL
, flags
);
6069 /* Move any messages in the old socket's receive queue that are for the
6070 * peeled off association to the new socket's receive queue.
6072 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
6073 event
= sctp_skb2event(skb
);
6074 if (event
->asoc
== assoc
) {
6075 sctp_sock_rfree_frag(skb
);
6076 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
6077 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
6078 sctp_skb_set_owner_r_frag(skb
, newsk
);
6082 /* Clean up any messages pending delivery due to partial
6083 * delivery. Three cases:
6084 * 1) No partial deliver; no work.
6085 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6086 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6088 skb_queue_head_init(&newsp
->pd_lobby
);
6089 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
6091 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
6092 struct sk_buff_head
*queue
;
6094 /* Decide which queue to move pd_lobby skbs to. */
6095 if (assoc
->ulpq
.pd_mode
) {
6096 queue
= &newsp
->pd_lobby
;
6098 queue
= &newsk
->sk_receive_queue
;
6100 /* Walk through the pd_lobby, looking for skbs that
6101 * need moved to the new socket.
6103 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6104 event
= sctp_skb2event(skb
);
6105 if (event
->asoc
== assoc
) {
6106 sctp_sock_rfree_frag(skb
);
6107 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6108 __skb_queue_tail(queue
, skb
);
6109 sctp_skb_set_owner_r_frag(skb
, newsk
);
6113 /* Clear up any skbs waiting for the partial
6114 * delivery to finish.
6116 if (assoc
->ulpq
.pd_mode
)
6117 sctp_clear_pd(oldsk
, NULL
);
6121 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
) {
6122 sctp_sock_rfree_frag(skb
);
6123 sctp_skb_set_owner_r_frag(skb
, newsk
);
6126 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
) {
6127 sctp_sock_rfree_frag(skb
);
6128 sctp_skb_set_owner_r_frag(skb
, newsk
);
6131 /* Set the type of socket to indicate that it is peeled off from the
6132 * original UDP-style socket or created with the accept() call on a
6133 * TCP-style socket..
6137 /* Mark the new socket "in-use" by the user so that any packets
6138 * that may arrive on the association after we've moved it are
6139 * queued to the backlog. This prevents a potential race between
6140 * backlog processing on the old socket and new-packet processing
6141 * on the new socket.
6143 * The caller has just allocated newsk so we can guarantee that other
6144 * paths won't try to lock it and then oldsk.
6146 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
6147 sctp_assoc_migrate(assoc
, newsk
);
6149 /* If the association on the newsk is already closed before accept()
6150 * is called, set RCV_SHUTDOWN flag.
6152 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
6153 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
6155 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
6156 sctp_release_sock(newsk
);
6159 /* This proto struct describes the ULP interface for SCTP. */
6160 struct proto sctp_prot
= {
6162 .owner
= THIS_MODULE
,
6163 .close
= sctp_close
,
6164 .connect
= sctp_connect
,
6165 .disconnect
= sctp_disconnect
,
6166 .accept
= sctp_accept
,
6167 .ioctl
= sctp_ioctl
,
6168 .init
= sctp_init_sock
,
6169 .destroy
= sctp_destroy_sock
,
6170 .shutdown
= sctp_shutdown
,
6171 .setsockopt
= sctp_setsockopt
,
6172 .getsockopt
= sctp_getsockopt
,
6173 .sendmsg
= sctp_sendmsg
,
6174 .recvmsg
= sctp_recvmsg
,
6176 .backlog_rcv
= sctp_backlog_rcv
,
6178 .unhash
= sctp_unhash
,
6179 .get_port
= sctp_get_port
,
6180 .obj_size
= sizeof(struct sctp_sock
),
6183 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6184 struct proto sctpv6_prot
= {
6186 .owner
= THIS_MODULE
,
6187 .close
= sctp_close
,
6188 .connect
= sctp_connect
,
6189 .disconnect
= sctp_disconnect
,
6190 .accept
= sctp_accept
,
6191 .ioctl
= sctp_ioctl
,
6192 .init
= sctp_init_sock
,
6193 .destroy
= sctp_destroy_sock
,
6194 .shutdown
= sctp_shutdown
,
6195 .setsockopt
= sctp_setsockopt
,
6196 .getsockopt
= sctp_getsockopt
,
6197 .sendmsg
= sctp_sendmsg
,
6198 .recvmsg
= sctp_recvmsg
,
6200 .backlog_rcv
= sctp_backlog_rcv
,
6202 .unhash
= sctp_unhash
,
6203 .get_port
= sctp_get_port
,
6204 .obj_size
= sizeof(struct sctp6_sock
),
6206 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */