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 extern kmem_cache_t
*sctp_bucket_cachep
;
112 /* Get the sndbuf space available at the time on the association. */
113 static inline int sctp_wspace(struct sctp_association
*asoc
)
115 struct sock
*sk
= asoc
->base
.sk
;
118 if (asoc
->ep
->sndbuf_policy
) {
119 /* make sure that no association uses more than sk_sndbuf */
120 amt
= sk
->sk_sndbuf
- asoc
->sndbuf_used
;
122 /* do socket level accounting */
123 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
132 /* Increment the used sndbuf space count of the corresponding association by
133 * the size of the outgoing data chunk.
134 * Also, set the skb destructor for sndbuf accounting later.
136 * Since it is always 1-1 between chunk and skb, and also a new skb is always
137 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
138 * destructor in the data chunk skb for the purpose of the sndbuf space
141 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
143 struct sctp_association
*asoc
= chunk
->asoc
;
144 struct sock
*sk
= asoc
->base
.sk
;
146 /* The sndbuf space is tracked per association. */
147 sctp_association_hold(asoc
);
149 skb_set_owner_w(chunk
->skb
, sk
);
151 chunk
->skb
->destructor
= sctp_wfree
;
152 /* Save the chunk pointer in skb for sctp_wfree to use later. */
153 *((struct sctp_chunk
**)(chunk
->skb
->cb
)) = chunk
;
155 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
156 sizeof(struct sk_buff
) +
157 sizeof(struct sctp_chunk
);
159 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
162 /* Verify that this is a valid address. */
163 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
168 /* Verify basic sockaddr. */
169 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
173 /* Is this a valid SCTP address? */
174 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
177 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
183 /* Look up the association by its id. If this is not a UDP-style
184 * socket, the ID field is always ignored.
186 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
188 struct sctp_association
*asoc
= NULL
;
190 /* If this is not a UDP-style socket, assoc id should be ignored. */
191 if (!sctp_style(sk
, UDP
)) {
192 /* Return NULL if the socket state is not ESTABLISHED. It
193 * could be a TCP-style listening socket or a socket which
194 * hasn't yet called connect() to establish an association.
196 if (!sctp_sstate(sk
, ESTABLISHED
))
199 /* Get the first and the only association from the list. */
200 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
201 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
202 struct sctp_association
, asocs
);
206 /* Otherwise this is a UDP-style socket. */
207 if (!id
|| (id
== (sctp_assoc_t
)-1))
210 spin_lock_bh(&sctp_assocs_id_lock
);
211 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
212 spin_unlock_bh(&sctp_assocs_id_lock
);
214 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
220 /* Look up the transport from an address and an assoc id. If both address and
221 * id are specified, the associations matching the address and the id should be
224 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
225 struct sockaddr_storage
*addr
,
228 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
229 struct sctp_transport
*transport
;
230 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
232 laddr
->v4
.sin_port
= ntohs(laddr
->v4
.sin_port
);
233 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
234 (union sctp_addr
*)addr
,
236 laddr
->v4
.sin_port
= htons(laddr
->v4
.sin_port
);
241 id_asoc
= sctp_id2assoc(sk
, id
);
242 if (id_asoc
&& (id_asoc
!= addr_asoc
))
245 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
246 (union sctp_addr
*)addr
);
251 /* API 3.1.2 bind() - UDP Style Syntax
252 * The syntax of bind() is,
254 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
256 * sd - the socket descriptor returned by socket().
257 * addr - the address structure (struct sockaddr_in or struct
258 * sockaddr_in6 [RFC 2553]),
259 * addr_len - the size of the address structure.
261 SCTP_STATIC
int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
267 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
270 /* Disallow binding twice. */
271 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
272 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
277 sctp_release_sock(sk
);
282 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
284 /* Verify this is a valid sockaddr. */
285 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
286 union sctp_addr
*addr
, int len
)
290 /* Check minimum size. */
291 if (len
< sizeof (struct sockaddr
))
294 /* Does this PF support this AF? */
295 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
298 /* If we get this far, af is valid. */
299 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
301 if (len
< af
->sockaddr_len
)
307 /* Bind a local address either to an endpoint or to an association. */
308 SCTP_STATIC
int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
310 struct sctp_sock
*sp
= sctp_sk(sk
);
311 struct sctp_endpoint
*ep
= sp
->ep
;
312 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
317 /* Common sockaddr verification. */
318 af
= sctp_sockaddr_af(sp
, addr
, len
);
320 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
325 snum
= ntohs(addr
->v4
.sin_port
);
327 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
328 ", port: %d, new port: %d, len: %d)\n",
334 /* PF specific bind() address verification. */
335 if (!sp
->pf
->bind_verify(sp
, addr
))
336 return -EADDRNOTAVAIL
;
338 /* We must either be unbound, or bind to the same port. */
339 if (bp
->port
&& (snum
!= bp
->port
)) {
340 SCTP_DEBUG_PRINTK("sctp_do_bind:"
341 " New port %d does not match existing port "
342 "%d.\n", snum
, bp
->port
);
346 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
349 /* Make sure we are allowed to bind here.
350 * The function sctp_get_port_local() does duplicate address
353 if ((ret
= sctp_get_port_local(sk
, addr
))) {
354 if (ret
== (long) sk
) {
355 /* This endpoint has a conflicting address. */
362 /* Refresh ephemeral port. */
364 bp
->port
= inet_sk(sk
)->num
;
366 /* Add the address to the bind address list. */
367 sctp_local_bh_disable();
368 sctp_write_lock(&ep
->base
.addr_lock
);
370 /* Use GFP_ATOMIC since BHs are disabled. */
371 addr
->v4
.sin_port
= ntohs(addr
->v4
.sin_port
);
372 ret
= sctp_add_bind_addr(bp
, addr
, 1, GFP_ATOMIC
);
373 addr
->v4
.sin_port
= htons(addr
->v4
.sin_port
);
374 sctp_write_unlock(&ep
->base
.addr_lock
);
375 sctp_local_bh_enable();
377 /* Copy back into socket for getsockname() use. */
379 inet_sk(sk
)->sport
= htons(inet_sk(sk
)->num
);
380 af
->to_sk_saddr(addr
, sk
);
386 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
388 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
389 * at any one time. If a sender, after sending an ASCONF chunk, decides
390 * it needs to transfer another ASCONF Chunk, it MUST wait until the
391 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
392 * subsequent ASCONF. Note this restriction binds each side, so at any
393 * time two ASCONF may be in-transit on any given association (one sent
394 * from each endpoint).
396 static int sctp_send_asconf(struct sctp_association
*asoc
,
397 struct sctp_chunk
*chunk
)
401 /* If there is an outstanding ASCONF chunk, queue it for later
404 if (asoc
->addip_last_asconf
) {
405 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
409 /* Hold the chunk until an ASCONF_ACK is received. */
410 sctp_chunk_hold(chunk
);
411 retval
= sctp_primitive_ASCONF(asoc
, chunk
);
413 sctp_chunk_free(chunk
);
415 asoc
->addip_last_asconf
= chunk
;
421 /* Add a list of addresses as bind addresses to local endpoint or
424 * Basically run through each address specified in the addrs/addrcnt
425 * array/length pair, determine if it is IPv6 or IPv4 and call
426 * sctp_do_bind() on it.
428 * If any of them fails, then the operation will be reversed and the
429 * ones that were added will be removed.
431 * Only sctp_setsockopt_bindx() is supposed to call this function.
433 int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
438 struct sockaddr
*sa_addr
;
441 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
445 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
446 /* The list may contain either IPv4 or IPv6 address;
447 * determine the address length for walking thru the list.
449 sa_addr
= (struct sockaddr
*)addr_buf
;
450 af
= sctp_get_af_specific(sa_addr
->sa_family
);
456 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
459 addr_buf
+= af
->sockaddr_len
;
463 /* Failed. Cleanup the ones that have been added */
465 sctp_bindx_rem(sk
, addrs
, cnt
);
473 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
474 * associations that are part of the endpoint indicating that a list of local
475 * addresses are added to the endpoint.
477 * If any of the addresses is already in the bind address list of the
478 * association, we do not send the chunk for that association. But it will not
479 * affect other associations.
481 * Only sctp_setsockopt_bindx() is supposed to call this function.
483 static int sctp_send_asconf_add_ip(struct sock
*sk
,
484 struct sockaddr
*addrs
,
487 struct sctp_sock
*sp
;
488 struct sctp_endpoint
*ep
;
489 struct sctp_association
*asoc
;
490 struct sctp_bind_addr
*bp
;
491 struct sctp_chunk
*chunk
;
492 struct sctp_sockaddr_entry
*laddr
;
493 union sctp_addr
*addr
;
494 union sctp_addr saveaddr
;
497 struct list_head
*pos
;
502 if (!sctp_addip_enable
)
508 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
509 __FUNCTION__
, sk
, addrs
, addrcnt
);
511 list_for_each(pos
, &ep
->asocs
) {
512 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
514 if (!asoc
->peer
.asconf_capable
)
517 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
520 if (!sctp_state(asoc
, ESTABLISHED
))
523 /* Check if any address in the packed array of addresses is
524 * in the bind address list of the association. If so,
525 * do not send the asconf chunk to its peer, but continue with
526 * other associations.
529 for (i
= 0; i
< addrcnt
; i
++) {
530 addr
= (union sctp_addr
*)addr_buf
;
531 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
537 if (sctp_assoc_lookup_laddr(asoc
, addr
))
540 addr_buf
+= af
->sockaddr_len
;
545 /* Use the first address in bind addr list of association as
546 * Address Parameter of ASCONF CHUNK.
548 sctp_read_lock(&asoc
->base
.addr_lock
);
549 bp
= &asoc
->base
.bind_addr
;
550 p
= bp
->address_list
.next
;
551 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
552 sctp_read_unlock(&asoc
->base
.addr_lock
);
554 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
555 addrcnt
, SCTP_PARAM_ADD_IP
);
561 retval
= sctp_send_asconf(asoc
, chunk
);
565 /* Add the new addresses to the bind address list with
566 * use_as_src set to 0.
568 sctp_local_bh_disable();
569 sctp_write_lock(&asoc
->base
.addr_lock
);
571 for (i
= 0; i
< addrcnt
; i
++) {
572 addr
= (union sctp_addr
*)addr_buf
;
573 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
574 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
575 saveaddr
.v4
.sin_port
= ntohs(saveaddr
.v4
.sin_port
);
576 retval
= sctp_add_bind_addr(bp
, &saveaddr
, 0,
578 addr_buf
+= af
->sockaddr_len
;
580 sctp_write_unlock(&asoc
->base
.addr_lock
);
581 sctp_local_bh_enable();
588 /* Remove a list of addresses from bind addresses list. Do not remove the
591 * Basically run through each address specified in the addrs/addrcnt
592 * array/length pair, determine if it is IPv6 or IPv4 and call
593 * sctp_del_bind() on it.
595 * If any of them fails, then the operation will be reversed and the
596 * ones that were removed will be added back.
598 * At least one address has to be left; if only one address is
599 * available, the operation will return -EBUSY.
601 * Only sctp_setsockopt_bindx() is supposed to call this function.
603 int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
605 struct sctp_sock
*sp
= sctp_sk(sk
);
606 struct sctp_endpoint
*ep
= sp
->ep
;
608 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
610 union sctp_addr saveaddr
;
612 struct sockaddr
*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 /* The list may contain either IPv4 or IPv6 address;
631 * determine the address length to copy the address to
634 sa_addr
= (struct sockaddr
*)addr_buf
;
635 af
= sctp_get_af_specific(sa_addr
->sa_family
);
640 memcpy(&saveaddr
, sa_addr
, af
->sockaddr_len
);
641 saveaddr
.v4
.sin_port
= ntohs(saveaddr
.v4
.sin_port
);
642 if (saveaddr
.v4
.sin_port
!= 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
, &saveaddr
);
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
;
696 union sctp_addr saveaddr
;
699 struct list_head
*pos
, *pos1
;
700 struct sctp_sockaddr_entry
*saddr
;
704 if (!sctp_addip_enable
)
710 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
711 __FUNCTION__
, sk
, addrs
, addrcnt
);
713 list_for_each(pos
, &ep
->asocs
) {
714 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
716 if (!asoc
->peer
.asconf_capable
)
719 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
722 if (!sctp_state(asoc
, ESTABLISHED
))
725 /* Check if any address in the packed array of addresses is
726 * not present in the bind address list of the association.
727 * If so, do not send the asconf chunk to its peer, but
728 * continue with other associations.
731 for (i
= 0; i
< addrcnt
; i
++) {
732 laddr
= (union sctp_addr
*)addr_buf
;
733 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
739 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
742 addr_buf
+= af
->sockaddr_len
;
747 /* Find one address in the association's bind address list
748 * that is not in the packed array of addresses. This is to
749 * make sure that we do not delete all the addresses in the
752 sctp_read_lock(&asoc
->base
.addr_lock
);
753 bp
= &asoc
->base
.bind_addr
;
754 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
756 sctp_read_unlock(&asoc
->base
.addr_lock
);
760 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
767 /* Reset use_as_src flag for the addresses in the bind address
768 * list that are to be deleted.
770 sctp_local_bh_disable();
771 sctp_write_lock(&asoc
->base
.addr_lock
);
773 for (i
= 0; i
< addrcnt
; i
++) {
774 laddr
= (union sctp_addr
*)addr_buf
;
775 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
776 memcpy(&saveaddr
, laddr
, af
->sockaddr_len
);
777 saveaddr
.v4
.sin_port
= ntohs(saveaddr
.v4
.sin_port
);
778 list_for_each(pos1
, &bp
->address_list
) {
779 saddr
= list_entry(pos1
,
780 struct sctp_sockaddr_entry
,
782 if (sctp_cmp_addr_exact(&saddr
->a
, &saveaddr
))
783 saddr
->use_as_src
= 0;
785 addr_buf
+= af
->sockaddr_len
;
787 sctp_write_unlock(&asoc
->base
.addr_lock
);
788 sctp_local_bh_enable();
790 /* Update the route and saddr entries for all the transports
791 * as some of the addresses in the bind address list are
792 * about to be deleted and cannot be used as source addresses.
794 list_for_each(pos1
, &asoc
->peer
.transport_addr_list
) {
795 transport
= list_entry(pos1
, struct sctp_transport
,
797 dst_release(transport
->dst
);
798 sctp_transport_route(transport
, NULL
,
799 sctp_sk(asoc
->base
.sk
));
802 retval
= sctp_send_asconf(asoc
, chunk
);
808 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
811 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
814 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
815 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
818 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
819 * Section 3.1.2 for this usage.
821 * addrs is a pointer to an array of one or more socket addresses. Each
822 * address is contained in its appropriate structure (i.e. struct
823 * sockaddr_in or struct sockaddr_in6) the family of the address type
824 * must be used to distengish the address length (note that this
825 * representation is termed a "packed array" of addresses). The caller
826 * specifies the number of addresses in the array with addrcnt.
828 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
829 * -1, and sets errno to the appropriate error code.
831 * For SCTP, the port given in each socket address must be the same, or
832 * sctp_bindx() will fail, setting errno to EINVAL.
834 * The flags parameter is formed from the bitwise OR of zero or more of
835 * the following currently defined flags:
837 * SCTP_BINDX_ADD_ADDR
839 * SCTP_BINDX_REM_ADDR
841 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
842 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
843 * addresses from the association. The two flags are mutually exclusive;
844 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
845 * not remove all addresses from an association; sctp_bindx() will
846 * reject such an attempt with EINVAL.
848 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
849 * additional addresses with an endpoint after calling bind(). Or use
850 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
851 * socket is associated with so that no new association accepted will be
852 * associated with those addresses. If the endpoint supports dynamic
853 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
854 * endpoint to send the appropriate message to the peer to change the
855 * peers address lists.
857 * Adding and removing addresses from a connected association is
858 * optional functionality. Implementations that do not support this
859 * functionality should return EOPNOTSUPP.
861 * Basically do nothing but copying the addresses from user to kernel
862 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
863 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
866 * We don't use copy_from_user() for optimization: we first do the
867 * sanity checks (buffer size -fast- and access check-healthy
868 * pointer); if all of those succeed, then we can alloc the memory
869 * (expensive operation) needed to copy the data to kernel. Then we do
870 * the copying without checking the user space area
871 * (__copy_from_user()).
873 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
876 * sk The sk of the socket
877 * addrs The pointer to the addresses in user land
878 * addrssize Size of the addrs buffer
879 * op Operation to perform (add or remove, see the flags of
882 * Returns 0 if ok, <0 errno code on error.
884 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
885 struct sockaddr __user
*addrs
,
886 int addrs_size
, int op
)
888 struct sockaddr
*kaddrs
;
892 struct sockaddr
*sa_addr
;
896 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
897 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
899 if (unlikely(addrs_size
<= 0))
902 /* Check the user passed a healthy pointer. */
903 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
906 /* Alloc space for the address array in kernel memory. */
907 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
908 if (unlikely(!kaddrs
))
911 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
916 /* Walk through the addrs buffer and count the number of addresses. */
918 while (walk_size
< addrs_size
) {
919 sa_addr
= (struct sockaddr
*)addr_buf
;
920 af
= sctp_get_af_specific(sa_addr
->sa_family
);
922 /* If the address family is not supported or if this address
923 * causes the address buffer to overflow return EINVAL.
925 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
930 addr_buf
+= af
->sockaddr_len
;
931 walk_size
+= af
->sockaddr_len
;
936 case SCTP_BINDX_ADD_ADDR
:
937 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
940 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
943 case SCTP_BINDX_REM_ADDR
:
944 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
947 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
961 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
963 * Common routine for handling connect() and sctp_connectx().
964 * Connect will come in with just a single address.
966 static int __sctp_connect(struct sock
* sk
,
967 struct sockaddr
*kaddrs
,
970 struct sctp_sock
*sp
;
971 struct sctp_endpoint
*ep
;
972 struct sctp_association
*asoc
= NULL
;
973 struct sctp_association
*asoc2
;
974 struct sctp_transport
*transport
;
982 struct sockaddr
*sa_addr
;
988 /* connect() cannot be done on a socket that is already in ESTABLISHED
989 * state - UDP-style peeled off socket or a TCP-style socket that
990 * is already connected.
991 * It cannot be done even on a TCP-style listening socket.
993 if (sctp_sstate(sk
, ESTABLISHED
) ||
994 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
999 /* Walk through the addrs buffer and count the number of addresses. */
1001 while (walk_size
< addrs_size
) {
1002 sa_addr
= (struct sockaddr
*)addr_buf
;
1003 af
= sctp_get_af_specific(sa_addr
->sa_family
);
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 err
= sctp_verify_addr(sk
, (union sctp_addr
*)sa_addr
,
1018 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1019 to
.v4
.sin_port
= ntohs(to
.v4
.sin_port
);
1021 /* Check if there already is a matching association on the
1022 * endpoint (other than the one created here).
1024 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1025 if (asoc2
&& asoc2
!= asoc
) {
1026 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1033 /* If we could not find a matching association on the endpoint,
1034 * make sure that there is no peeled-off association matching
1035 * the peer address even on another socket.
1037 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1038 err
= -EADDRNOTAVAIL
;
1043 /* If a bind() or sctp_bindx() is not called prior to
1044 * an sctp_connectx() call, the system picks an
1045 * ephemeral port and will choose an address set
1046 * equivalent to binding with a wildcard address.
1048 if (!ep
->base
.bind_addr
.port
) {
1049 if (sctp_autobind(sk
)) {
1055 * If an unprivileged user inherits a 1-many
1056 * style socket with open associations on a
1057 * privileged port, it MAY be permitted to
1058 * accept new associations, but it SHOULD NOT
1059 * be permitted to open new associations.
1061 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1062 !capable(CAP_NET_BIND_SERVICE
)) {
1068 scope
= sctp_scope(&to
);
1069 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1076 /* Prime the peer's transport structures. */
1077 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1085 addr_buf
+= af
->sockaddr_len
;
1086 walk_size
+= af
->sockaddr_len
;
1089 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1094 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1099 /* Initialize sk's dport and daddr for getpeername() */
1100 inet_sk(sk
)->dport
= htons(asoc
->peer
.port
);
1101 af
= sctp_get_af_specific(to
.sa
.sa_family
);
1102 af
->to_sk_daddr(&to
, sk
);
1105 timeo
= sock_sndtimeo(sk
, sk
->sk_socket
->file
->f_flags
& O_NONBLOCK
);
1106 err
= sctp_wait_for_connect(asoc
, &timeo
);
1108 /* Don't free association on exit. */
1113 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1114 " kaddrs: %p err: %d\n",
1117 sctp_association_free(asoc
);
1121 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1124 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
1126 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1127 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1128 * or IPv6 addresses.
1130 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1131 * Section 3.1.2 for this usage.
1133 * addrs is a pointer to an array of one or more socket addresses. Each
1134 * address is contained in its appropriate structure (i.e. struct
1135 * sockaddr_in or struct sockaddr_in6) the family of the address type
1136 * must be used to distengish the address length (note that this
1137 * representation is termed a "packed array" of addresses). The caller
1138 * specifies the number of addresses in the array with addrcnt.
1140 * On success, sctp_connectx() returns 0. On failure, sctp_connectx() returns
1141 * -1, and sets errno to the appropriate error code.
1143 * For SCTP, the port given in each socket address must be the same, or
1144 * sctp_connectx() will fail, setting errno to EINVAL.
1146 * An application can use sctp_connectx to initiate an association with
1147 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1148 * allows a caller to specify multiple addresses at which a peer can be
1149 * reached. The way the SCTP stack uses the list of addresses to set up
1150 * the association is implementation dependant. This function only
1151 * specifies that the stack will try to make use of all the addresses in
1152 * the list when needed.
1154 * Note that the list of addresses passed in is only used for setting up
1155 * the association. It does not necessarily equal the set of addresses
1156 * the peer uses for the resulting association. If the caller wants to
1157 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1158 * retrieve them after the association has been set up.
1160 * Basically do nothing but copying the addresses from user to kernel
1161 * land and invoking either sctp_connectx(). This is used for tunneling
1162 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1164 * We don't use copy_from_user() for optimization: we first do the
1165 * sanity checks (buffer size -fast- and access check-healthy
1166 * pointer); if all of those succeed, then we can alloc the memory
1167 * (expensive operation) needed to copy the data to kernel. Then we do
1168 * the copying without checking the user space area
1169 * (__copy_from_user()).
1171 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1174 * sk The sk of the socket
1175 * addrs The pointer to the addresses in user land
1176 * addrssize Size of the addrs buffer
1178 * Returns 0 if ok, <0 errno code on error.
1180 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1181 struct sockaddr __user
*addrs
,
1185 struct sockaddr
*kaddrs
;
1187 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1188 __FUNCTION__
, sk
, addrs
, addrs_size
);
1190 if (unlikely(addrs_size
<= 0))
1193 /* Check the user passed a healthy pointer. */
1194 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1197 /* Alloc space for the address array in kernel memory. */
1198 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1199 if (unlikely(!kaddrs
))
1202 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1205 err
= __sctp_connect(sk
, kaddrs
, addrs_size
);
1212 /* API 3.1.4 close() - UDP Style Syntax
1213 * Applications use close() to perform graceful shutdown (as described in
1214 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1215 * by a UDP-style socket.
1219 * ret = close(int sd);
1221 * sd - the socket descriptor of the associations to be closed.
1223 * To gracefully shutdown a specific association represented by the
1224 * UDP-style socket, an application should use the sendmsg() call,
1225 * passing no user data, but including the appropriate flag in the
1226 * ancillary data (see Section xxxx).
1228 * If sd in the close() call is a branched-off socket representing only
1229 * one association, the shutdown is performed on that association only.
1231 * 4.1.6 close() - TCP Style Syntax
1233 * Applications use close() to gracefully close down an association.
1237 * int close(int sd);
1239 * sd - the socket descriptor of the association to be closed.
1241 * After an application calls close() on a socket descriptor, no further
1242 * socket operations will succeed on that descriptor.
1244 * API 7.1.4 SO_LINGER
1246 * An application using the TCP-style socket can use this option to
1247 * perform the SCTP ABORT primitive. The linger option structure is:
1250 * int l_onoff; // option on/off
1251 * int l_linger; // linger time
1254 * To enable the option, set l_onoff to 1. If the l_linger value is set
1255 * to 0, calling close() is the same as the ABORT primitive. If the
1256 * value is set to a negative value, the setsockopt() call will return
1257 * an error. If the value is set to a positive value linger_time, the
1258 * close() can be blocked for at most linger_time ms. If the graceful
1259 * shutdown phase does not finish during this period, close() will
1260 * return but the graceful shutdown phase continues in the system.
1262 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1264 struct sctp_endpoint
*ep
;
1265 struct sctp_association
*asoc
;
1266 struct list_head
*pos
, *temp
;
1268 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1271 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1273 ep
= sctp_sk(sk
)->ep
;
1275 /* Walk all associations on an endpoint. */
1276 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1277 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1279 if (sctp_style(sk
, TCP
)) {
1280 /* A closed association can still be in the list if
1281 * it belongs to a TCP-style listening socket that is
1282 * not yet accepted. If so, free it. If not, send an
1283 * ABORT or SHUTDOWN based on the linger options.
1285 if (sctp_state(asoc
, CLOSED
)) {
1286 sctp_unhash_established(asoc
);
1287 sctp_association_free(asoc
);
1292 if (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
)
1293 sctp_primitive_ABORT(asoc
, NULL
);
1295 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1298 /* Clean up any skbs sitting on the receive queue. */
1299 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1300 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1302 /* On a TCP-style socket, block for at most linger_time if set. */
1303 if (sctp_style(sk
, TCP
) && timeout
)
1304 sctp_wait_for_close(sk
, timeout
);
1306 /* This will run the backlog queue. */
1307 sctp_release_sock(sk
);
1309 /* Supposedly, no process has access to the socket, but
1310 * the net layers still may.
1312 sctp_local_bh_disable();
1313 sctp_bh_lock_sock(sk
);
1315 /* Hold the sock, since sk_common_release() will put sock_put()
1316 * and we have just a little more cleanup.
1319 sk_common_release(sk
);
1321 sctp_bh_unlock_sock(sk
);
1322 sctp_local_bh_enable();
1326 SCTP_DBG_OBJCNT_DEC(sock
);
1329 /* Handle EPIPE error. */
1330 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1333 err
= sock_error(sk
) ? : -EPIPE
;
1334 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1335 send_sig(SIGPIPE
, current
, 0);
1339 /* API 3.1.3 sendmsg() - UDP Style Syntax
1341 * An application uses sendmsg() and recvmsg() calls to transmit data to
1342 * and receive data from its peer.
1344 * ssize_t sendmsg(int socket, const struct msghdr *message,
1347 * socket - the socket descriptor of the endpoint.
1348 * message - pointer to the msghdr structure which contains a single
1349 * user message and possibly some ancillary data.
1351 * See Section 5 for complete description of the data
1354 * flags - flags sent or received with the user message, see Section
1355 * 5 for complete description of the flags.
1357 * Note: This function could use a rewrite especially when explicit
1358 * connect support comes in.
1360 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1362 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1364 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1365 struct msghdr
*msg
, size_t msg_len
)
1367 struct sctp_sock
*sp
;
1368 struct sctp_endpoint
*ep
;
1369 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1370 struct sctp_transport
*transport
, *chunk_tp
;
1371 struct sctp_chunk
*chunk
;
1373 struct sockaddr
*msg_name
= NULL
;
1374 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1375 struct sctp_sndrcvinfo
*sinfo
;
1376 struct sctp_initmsg
*sinit
;
1377 sctp_assoc_t associd
= 0;
1378 sctp_cmsgs_t cmsgs
= { NULL
};
1382 __u16 sinfo_flags
= 0;
1383 struct sctp_datamsg
*datamsg
;
1384 struct list_head
*pos
;
1385 int msg_flags
= msg
->msg_flags
;
1387 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1394 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1396 /* We cannot send a message over a TCP-style listening socket. */
1397 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1402 /* Parse out the SCTP CMSGs. */
1403 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1406 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1410 /* Fetch the destination address for this packet. This
1411 * address only selects the association--it is not necessarily
1412 * the address we will send to.
1413 * For a peeled-off socket, msg_name is ignored.
1415 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1416 int msg_namelen
= msg
->msg_namelen
;
1418 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1423 if (msg_namelen
> sizeof(to
))
1424 msg_namelen
= sizeof(to
);
1425 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1426 SCTP_DEBUG_PRINTK("Just memcpy'd. msg_name is "
1428 to
.v4
.sin_addr
.s_addr
, to
.v4
.sin_port
);
1430 to
.v4
.sin_port
= ntohs(to
.v4
.sin_port
);
1431 msg_name
= msg
->msg_name
;
1437 /* Did the user specify SNDRCVINFO? */
1439 sinfo_flags
= sinfo
->sinfo_flags
;
1440 associd
= sinfo
->sinfo_assoc_id
;
1443 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1444 msg_len
, sinfo_flags
);
1446 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1447 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1452 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1453 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1454 * If SCTP_ABORT is set, the message length could be non zero with
1455 * the msg_iov set to the user abort reason.
1457 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1458 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1463 /* If SCTP_ADDR_OVER is set, there must be an address
1464 * specified in msg_name.
1466 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1473 SCTP_DEBUG_PRINTK("About to look up association.\n");
1477 /* If a msg_name has been specified, assume this is to be used. */
1479 /* Look for a matching association on the endpoint. */
1480 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1482 /* If we could not find a matching association on the
1483 * endpoint, make sure that it is not a TCP-style
1484 * socket that already has an association or there is
1485 * no peeled-off association on another socket.
1487 if ((sctp_style(sk
, TCP
) &&
1488 sctp_sstate(sk
, ESTABLISHED
)) ||
1489 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1490 err
= -EADDRNOTAVAIL
;
1495 asoc
= sctp_id2assoc(sk
, associd
);
1503 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1505 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1506 * socket that has an association in CLOSED state. This can
1507 * happen when an accepted socket has an association that is
1510 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1515 if (sinfo_flags
& SCTP_EOF
) {
1516 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1518 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1522 if (sinfo_flags
& SCTP_ABORT
) {
1523 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1524 sctp_primitive_ABORT(asoc
, msg
);
1530 /* Do we need to create the association? */
1532 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1534 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1539 /* Check for invalid stream against the stream counts,
1540 * either the default or the user specified stream counts.
1543 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1544 /* Check against the defaults. */
1545 if (sinfo
->sinfo_stream
>=
1546 sp
->initmsg
.sinit_num_ostreams
) {
1551 /* Check against the requested. */
1552 if (sinfo
->sinfo_stream
>=
1553 sinit
->sinit_num_ostreams
) {
1561 * API 3.1.2 bind() - UDP Style Syntax
1562 * If a bind() or sctp_bindx() is not called prior to a
1563 * sendmsg() call that initiates a new association, the
1564 * system picks an ephemeral port and will choose an address
1565 * set equivalent to binding with a wildcard address.
1567 if (!ep
->base
.bind_addr
.port
) {
1568 if (sctp_autobind(sk
)) {
1574 * If an unprivileged user inherits a one-to-many
1575 * style socket with open associations on a privileged
1576 * port, it MAY be permitted to accept new associations,
1577 * but it SHOULD NOT be permitted to open new
1580 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1581 !capable(CAP_NET_BIND_SERVICE
)) {
1587 scope
= sctp_scope(&to
);
1588 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1595 /* If the SCTP_INIT ancillary data is specified, set all
1596 * the association init values accordingly.
1599 if (sinit
->sinit_num_ostreams
) {
1600 asoc
->c
.sinit_num_ostreams
=
1601 sinit
->sinit_num_ostreams
;
1603 if (sinit
->sinit_max_instreams
) {
1604 asoc
->c
.sinit_max_instreams
=
1605 sinit
->sinit_max_instreams
;
1607 if (sinit
->sinit_max_attempts
) {
1608 asoc
->max_init_attempts
1609 = sinit
->sinit_max_attempts
;
1611 if (sinit
->sinit_max_init_timeo
) {
1612 asoc
->max_init_timeo
=
1613 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1617 /* Prime the peer's transport structures. */
1618 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1623 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1630 /* ASSERT: we have a valid association at this point. */
1631 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1634 /* If the user didn't specify SNDRCVINFO, make up one with
1637 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1638 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1639 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1640 default_sinfo
.sinfo_context
= asoc
->default_context
;
1641 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1642 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1643 sinfo
= &default_sinfo
;
1646 /* API 7.1.7, the sndbuf size per association bounds the
1647 * maximum size of data that can be sent in a single send call.
1649 if (msg_len
> sk
->sk_sndbuf
) {
1654 /* If fragmentation is disabled and the message length exceeds the
1655 * association fragmentation point, return EMSGSIZE. The I-D
1656 * does not specify what this error is, but this looks like
1659 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1665 /* Check for invalid stream. */
1666 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1672 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1673 if (!sctp_wspace(asoc
)) {
1674 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1679 /* If an address is passed with the sendto/sendmsg call, it is used
1680 * to override the primary destination address in the TCP model, or
1681 * when SCTP_ADDR_OVER flag is set in the UDP model.
1683 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1684 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1685 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1693 /* Auto-connect, if we aren't connected already. */
1694 if (sctp_state(asoc
, CLOSED
)) {
1695 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1698 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1701 /* Break the message into multiple chunks of maximum size. */
1702 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1708 /* Now send the (possibly) fragmented message. */
1709 list_for_each(pos
, &datamsg
->chunks
) {
1710 chunk
= list_entry(pos
, struct sctp_chunk
, frag_list
);
1711 sctp_datamsg_track(chunk
);
1713 /* Do accounting for the write space. */
1714 sctp_set_owner_w(chunk
);
1716 chunk
->transport
= chunk_tp
;
1718 /* Send it to the lower layers. Note: all chunks
1719 * must either fail or succeed. The lower layer
1720 * works that way today. Keep it that way or this
1723 err
= sctp_primitive_SEND(asoc
, chunk
);
1724 /* Did the lower layer accept the chunk? */
1726 sctp_chunk_free(chunk
);
1727 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1730 sctp_datamsg_free(datamsg
);
1736 /* If we are already past ASSOCIATE, the lower
1737 * layers are responsible for association cleanup.
1743 sctp_association_free(asoc
);
1745 sctp_release_sock(sk
);
1748 return sctp_error(sk
, msg_flags
, err
);
1755 err
= sock_error(sk
);
1765 /* This is an extended version of skb_pull() that removes the data from the
1766 * start of a skb even when data is spread across the list of skb's in the
1767 * frag_list. len specifies the total amount of data that needs to be removed.
1768 * when 'len' bytes could be removed from the skb, it returns 0.
1769 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1770 * could not be removed.
1772 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1774 struct sk_buff
*list
;
1775 int skb_len
= skb_headlen(skb
);
1778 if (len
<= skb_len
) {
1779 __skb_pull(skb
, len
);
1783 __skb_pull(skb
, skb_len
);
1785 for (list
= skb_shinfo(skb
)->frag_list
; list
; list
= list
->next
) {
1786 rlen
= sctp_skb_pull(list
, len
);
1787 skb
->len
-= (len
-rlen
);
1788 skb
->data_len
-= (len
-rlen
);
1799 /* API 3.1.3 recvmsg() - UDP Style Syntax
1801 * ssize_t recvmsg(int socket, struct msghdr *message,
1804 * socket - the socket descriptor of the endpoint.
1805 * message - pointer to the msghdr structure which contains a single
1806 * user message and possibly some ancillary data.
1808 * See Section 5 for complete description of the data
1811 * flags - flags sent or received with the user message, see Section
1812 * 5 for complete description of the flags.
1814 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1816 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1817 struct msghdr
*msg
, size_t len
, int noblock
,
1818 int flags
, int *addr_len
)
1820 struct sctp_ulpevent
*event
= NULL
;
1821 struct sctp_sock
*sp
= sctp_sk(sk
);
1822 struct sk_buff
*skb
;
1827 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1828 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1829 "len", len
, "knoblauch", noblock
,
1830 "flags", flags
, "addr_len", addr_len
);
1834 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1839 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1843 /* Get the total length of the skb including any skb's in the
1852 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1854 event
= sctp_skb2event(skb
);
1859 sock_recv_timestamp(msg
, sk
, skb
);
1860 if (sctp_ulpevent_is_notification(event
)) {
1861 msg
->msg_flags
|= MSG_NOTIFICATION
;
1862 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1864 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1867 /* Check if we allow SCTP_SNDRCVINFO. */
1868 if (sp
->subscribe
.sctp_data_io_event
)
1869 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1871 /* FIXME: we should be calling IP/IPv6 layers. */
1872 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1873 ip_cmsg_recv(msg
, skb
);
1878 /* If skb's length exceeds the user's buffer, update the skb and
1879 * push it back to the receive_queue so that the next call to
1880 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1882 if (skb_len
> copied
) {
1883 msg
->msg_flags
&= ~MSG_EOR
;
1884 if (flags
& MSG_PEEK
)
1886 sctp_skb_pull(skb
, copied
);
1887 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1889 /* When only partial message is copied to the user, increase
1890 * rwnd by that amount. If all the data in the skb is read,
1891 * rwnd is updated when the event is freed.
1893 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
1895 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
1896 (event
->msg_flags
& MSG_EOR
))
1897 msg
->msg_flags
|= MSG_EOR
;
1899 msg
->msg_flags
&= ~MSG_EOR
;
1902 if (flags
& MSG_PEEK
) {
1903 /* Release the skb reference acquired after peeking the skb in
1904 * sctp_skb_recv_datagram().
1908 /* Free the event which includes releasing the reference to
1909 * the owner of the skb, freeing the skb and updating the
1912 sctp_ulpevent_free(event
);
1915 sctp_release_sock(sk
);
1919 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1921 * This option is a on/off flag. If enabled no SCTP message
1922 * fragmentation will be performed. Instead if a message being sent
1923 * exceeds the current PMTU size, the message will NOT be sent and
1924 * instead a error will be indicated to the user.
1926 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
1927 char __user
*optval
, int optlen
)
1931 if (optlen
< sizeof(int))
1934 if (get_user(val
, (int __user
*)optval
))
1937 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
1942 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
1945 if (optlen
!= sizeof(struct sctp_event_subscribe
))
1947 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
1952 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
1954 * This socket option is applicable to the UDP-style socket only. When
1955 * set it will cause associations that are idle for more than the
1956 * specified number of seconds to automatically close. An association
1957 * being idle is defined an association that has NOT sent or received
1958 * user data. The special value of '0' indicates that no automatic
1959 * close of any associations should be performed. The option expects an
1960 * integer defining the number of seconds of idle time before an
1961 * association is closed.
1963 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
1966 struct sctp_sock
*sp
= sctp_sk(sk
);
1968 /* Applicable to UDP-style socket only */
1969 if (sctp_style(sk
, TCP
))
1971 if (optlen
!= sizeof(int))
1973 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
1979 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
1981 * Applications can enable or disable heartbeats for any peer address of
1982 * an association, modify an address's heartbeat interval, force a
1983 * heartbeat to be sent immediately, and adjust the address's maximum
1984 * number of retransmissions sent before an address is considered
1985 * unreachable. The following structure is used to access and modify an
1986 * address's parameters:
1988 * struct sctp_paddrparams {
1989 * sctp_assoc_t spp_assoc_id;
1990 * struct sockaddr_storage spp_address;
1991 * uint32_t spp_hbinterval;
1992 * uint16_t spp_pathmaxrxt;
1993 * uint32_t spp_pathmtu;
1994 * uint32_t spp_sackdelay;
1995 * uint32_t spp_flags;
1998 * spp_assoc_id - (one-to-many style socket) This is filled in the
1999 * application, and identifies the association for
2001 * spp_address - This specifies which address is of interest.
2002 * spp_hbinterval - This contains the value of the heartbeat interval,
2003 * in milliseconds. If a value of zero
2004 * is present in this field then no changes are to
2005 * be made to this parameter.
2006 * spp_pathmaxrxt - This contains the maximum number of
2007 * retransmissions before this address shall be
2008 * considered unreachable. If a value of zero
2009 * is present in this field then no changes are to
2010 * be made to this parameter.
2011 * spp_pathmtu - When Path MTU discovery is disabled the value
2012 * specified here will be the "fixed" path mtu.
2013 * Note that if the spp_address field is empty
2014 * then all associations on this address will
2015 * have this fixed path mtu set upon them.
2017 * spp_sackdelay - When delayed sack is enabled, this value specifies
2018 * the number of milliseconds that sacks will be delayed
2019 * for. This value will apply to all addresses of an
2020 * association if the spp_address field is empty. Note
2021 * also, that if delayed sack is enabled and this
2022 * value is set to 0, no change is made to the last
2023 * recorded delayed sack timer value.
2025 * spp_flags - These flags are used to control various features
2026 * on an association. The flag field may contain
2027 * zero or more of the following options.
2029 * SPP_HB_ENABLE - Enable heartbeats on the
2030 * specified address. Note that if the address
2031 * field is empty all addresses for the association
2032 * have heartbeats enabled upon them.
2034 * SPP_HB_DISABLE - Disable heartbeats on the
2035 * speicifed address. Note that if the address
2036 * field is empty all addresses for the association
2037 * will have their heartbeats disabled. Note also
2038 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2039 * mutually exclusive, only one of these two should
2040 * be specified. Enabling both fields will have
2041 * undetermined results.
2043 * SPP_HB_DEMAND - Request a user initiated heartbeat
2044 * to be made immediately.
2046 * SPP_PMTUD_ENABLE - This field will enable PMTU
2047 * discovery upon the specified address. Note that
2048 * if the address feild is empty then all addresses
2049 * on the association are effected.
2051 * SPP_PMTUD_DISABLE - This field will disable PMTU
2052 * discovery upon the specified address. Note that
2053 * if the address feild is empty then all addresses
2054 * on the association are effected. Not also that
2055 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2056 * exclusive. Enabling both will have undetermined
2059 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2060 * on delayed sack. The time specified in spp_sackdelay
2061 * is used to specify the sack delay for this address. Note
2062 * that if spp_address is empty then all addresses will
2063 * enable delayed sack and take on the sack delay
2064 * value specified in spp_sackdelay.
2065 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2066 * off delayed sack. If the spp_address field is blank then
2067 * delayed sack is disabled for the entire association. Note
2068 * also that this field is mutually exclusive to
2069 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2072 int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2073 struct sctp_transport
*trans
,
2074 struct sctp_association
*asoc
,
2075 struct sctp_sock
*sp
,
2078 int sackdelay_change
)
2082 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2083 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2088 if (params
->spp_hbinterval
) {
2090 trans
->hbinterval
= msecs_to_jiffies(params
->spp_hbinterval
);
2092 asoc
->hbinterval
= msecs_to_jiffies(params
->spp_hbinterval
);
2094 sp
->hbinterval
= params
->spp_hbinterval
;
2100 trans
->param_flags
=
2101 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2104 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2107 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2111 if (params
->spp_pathmtu
) {
2113 trans
->pathmtu
= params
->spp_pathmtu
;
2114 sctp_assoc_sync_pmtu(asoc
);
2116 asoc
->pathmtu
= params
->spp_pathmtu
;
2117 sctp_frag_point(sp
, params
->spp_pathmtu
);
2119 sp
->pathmtu
= params
->spp_pathmtu
;
2125 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2126 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2127 trans
->param_flags
=
2128 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2130 sctp_transport_pmtu(trans
);
2131 sctp_assoc_sync_pmtu(asoc
);
2135 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2138 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2142 if (params
->spp_sackdelay
) {
2145 msecs_to_jiffies(params
->spp_sackdelay
);
2148 msecs_to_jiffies(params
->spp_sackdelay
);
2150 sp
->sackdelay
= params
->spp_sackdelay
;
2154 if (sackdelay_change
) {
2156 trans
->param_flags
=
2157 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2161 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2165 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2170 if (params
->spp_pathmaxrxt
) {
2172 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2174 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2176 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2183 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2184 char __user
*optval
, int optlen
)
2186 struct sctp_paddrparams params
;
2187 struct sctp_transport
*trans
= NULL
;
2188 struct sctp_association
*asoc
= NULL
;
2189 struct sctp_sock
*sp
= sctp_sk(sk
);
2191 int hb_change
, pmtud_change
, sackdelay_change
;
2193 if (optlen
!= sizeof(struct sctp_paddrparams
))
2196 if (copy_from_user(¶ms
, optval
, optlen
))
2199 /* Validate flags and value parameters. */
2200 hb_change
= params
.spp_flags
& SPP_HB
;
2201 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2202 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2204 if (hb_change
== SPP_HB
||
2205 pmtud_change
== SPP_PMTUD
||
2206 sackdelay_change
== SPP_SACKDELAY
||
2207 params
.spp_sackdelay
> 500 ||
2209 && params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2212 /* If an address other than INADDR_ANY is specified, and
2213 * no transport is found, then the request is invalid.
2215 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
2216 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2217 params
.spp_assoc_id
);
2222 /* Get association, if assoc_id != 0 and the socket is a one
2223 * to many style socket, and an association was not found, then
2224 * the id was invalid.
2226 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2227 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2230 /* Heartbeat demand can only be sent on a transport or
2231 * association, but not a socket.
2233 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2236 /* Process parameters. */
2237 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2238 hb_change
, pmtud_change
,
2244 /* If changes are for association, also apply parameters to each
2247 if (!trans
&& asoc
) {
2248 struct list_head
*pos
;
2250 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2251 trans
= list_entry(pos
, struct sctp_transport
,
2253 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2254 hb_change
, pmtud_change
,
2262 /* 7.1.24. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
2264 * This options will get or set the delayed ack timer. The time is set
2265 * in milliseconds. If the assoc_id is 0, then this sets or gets the
2266 * endpoints default delayed ack timer value. If the assoc_id field is
2267 * non-zero, then the set or get effects the specified association.
2269 * struct sctp_assoc_value {
2270 * sctp_assoc_t assoc_id;
2271 * uint32_t assoc_value;
2274 * assoc_id - This parameter, indicates which association the
2275 * user is preforming an action upon. Note that if
2276 * this field's value is zero then the endpoints
2277 * default value is changed (effecting future
2278 * associations only).
2280 * assoc_value - This parameter contains the number of milliseconds
2281 * that the user is requesting the delayed ACK timer
2282 * be set to. Note that this value is defined in
2283 * the standard to be between 200 and 500 milliseconds.
2285 * Note: a value of zero will leave the value alone,
2286 * but disable SACK delay. A non-zero value will also
2287 * enable SACK delay.
2290 static int sctp_setsockopt_delayed_ack_time(struct sock
*sk
,
2291 char __user
*optval
, int optlen
)
2293 struct sctp_assoc_value params
;
2294 struct sctp_transport
*trans
= NULL
;
2295 struct sctp_association
*asoc
= NULL
;
2296 struct sctp_sock
*sp
= sctp_sk(sk
);
2298 if (optlen
!= sizeof(struct sctp_assoc_value
))
2301 if (copy_from_user(¶ms
, optval
, optlen
))
2304 /* Validate value parameter. */
2305 if (params
.assoc_value
> 500)
2308 /* Get association, if assoc_id != 0 and the socket is a one
2309 * to many style socket, and an association was not found, then
2310 * the id was invalid.
2312 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2313 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
2316 if (params
.assoc_value
) {
2319 msecs_to_jiffies(params
.assoc_value
);
2321 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2322 SPP_SACKDELAY_ENABLE
;
2324 sp
->sackdelay
= params
.assoc_value
;
2326 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2327 SPP_SACKDELAY_ENABLE
;
2332 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2333 SPP_SACKDELAY_DISABLE
;
2336 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2337 SPP_SACKDELAY_DISABLE
;
2341 /* If change is for association, also apply to each transport. */
2343 struct list_head
*pos
;
2345 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2346 trans
= list_entry(pos
, struct sctp_transport
,
2348 if (params
.assoc_value
) {
2350 msecs_to_jiffies(params
.assoc_value
);
2351 trans
->param_flags
=
2352 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2353 SPP_SACKDELAY_ENABLE
;
2355 trans
->param_flags
=
2356 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2357 SPP_SACKDELAY_DISABLE
;
2365 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2367 * Applications can specify protocol parameters for the default association
2368 * initialization. The option name argument to setsockopt() and getsockopt()
2371 * Setting initialization parameters is effective only on an unconnected
2372 * socket (for UDP-style sockets only future associations are effected
2373 * by the change). With TCP-style sockets, this option is inherited by
2374 * sockets derived from a listener socket.
2376 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, int optlen
)
2378 struct sctp_initmsg sinit
;
2379 struct sctp_sock
*sp
= sctp_sk(sk
);
2381 if (optlen
!= sizeof(struct sctp_initmsg
))
2383 if (copy_from_user(&sinit
, optval
, optlen
))
2386 if (sinit
.sinit_num_ostreams
)
2387 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2388 if (sinit
.sinit_max_instreams
)
2389 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2390 if (sinit
.sinit_max_attempts
)
2391 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2392 if (sinit
.sinit_max_init_timeo
)
2393 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2399 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2401 * Applications that wish to use the sendto() system call may wish to
2402 * specify a default set of parameters that would normally be supplied
2403 * through the inclusion of ancillary data. This socket option allows
2404 * such an application to set the default sctp_sndrcvinfo structure.
2405 * The application that wishes to use this socket option simply passes
2406 * in to this call the sctp_sndrcvinfo structure defined in Section
2407 * 5.2.2) The input parameters accepted by this call include
2408 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2409 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2410 * to this call if the caller is using the UDP model.
2412 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2413 char __user
*optval
, int optlen
)
2415 struct sctp_sndrcvinfo info
;
2416 struct sctp_association
*asoc
;
2417 struct sctp_sock
*sp
= sctp_sk(sk
);
2419 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2421 if (copy_from_user(&info
, optval
, optlen
))
2424 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2425 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2429 asoc
->default_stream
= info
.sinfo_stream
;
2430 asoc
->default_flags
= info
.sinfo_flags
;
2431 asoc
->default_ppid
= info
.sinfo_ppid
;
2432 asoc
->default_context
= info
.sinfo_context
;
2433 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2435 sp
->default_stream
= info
.sinfo_stream
;
2436 sp
->default_flags
= info
.sinfo_flags
;
2437 sp
->default_ppid
= info
.sinfo_ppid
;
2438 sp
->default_context
= info
.sinfo_context
;
2439 sp
->default_timetolive
= info
.sinfo_timetolive
;
2445 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2447 * Requests that the local SCTP stack use the enclosed peer address as
2448 * the association primary. The enclosed address must be one of the
2449 * association peer's addresses.
2451 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2454 struct sctp_prim prim
;
2455 struct sctp_transport
*trans
;
2457 if (optlen
!= sizeof(struct sctp_prim
))
2460 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2463 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2467 sctp_assoc_set_primary(trans
->asoc
, trans
);
2473 * 7.1.5 SCTP_NODELAY
2475 * Turn on/off any Nagle-like algorithm. This means that packets are
2476 * generally sent as soon as possible and no unnecessary delays are
2477 * introduced, at the cost of more packets in the network. Expects an
2478 * integer boolean flag.
2480 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2485 if (optlen
< sizeof(int))
2487 if (get_user(val
, (int __user
*)optval
))
2490 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2496 * 7.1.1 SCTP_RTOINFO
2498 * The protocol parameters used to initialize and bound retransmission
2499 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2500 * and modify these parameters.
2501 * All parameters are time values, in milliseconds. A value of 0, when
2502 * modifying the parameters, indicates that the current value should not
2506 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, int optlen
) {
2507 struct sctp_rtoinfo rtoinfo
;
2508 struct sctp_association
*asoc
;
2510 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2513 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2516 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2518 /* Set the values to the specific association */
2519 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2523 if (rtoinfo
.srto_initial
!= 0)
2525 msecs_to_jiffies(rtoinfo
.srto_initial
);
2526 if (rtoinfo
.srto_max
!= 0)
2527 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2528 if (rtoinfo
.srto_min
!= 0)
2529 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2531 /* If there is no association or the association-id = 0
2532 * set the values to the endpoint.
2534 struct sctp_sock
*sp
= sctp_sk(sk
);
2536 if (rtoinfo
.srto_initial
!= 0)
2537 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2538 if (rtoinfo
.srto_max
!= 0)
2539 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2540 if (rtoinfo
.srto_min
!= 0)
2541 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2549 * 7.1.2 SCTP_ASSOCINFO
2551 * This option is used to tune the the maximum retransmission attempts
2552 * of the association.
2553 * Returns an error if the new association retransmission value is
2554 * greater than the sum of the retransmission value of the peer.
2555 * See [SCTP] for more information.
2558 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, int optlen
)
2561 struct sctp_assocparams assocparams
;
2562 struct sctp_association
*asoc
;
2564 if (optlen
!= sizeof(struct sctp_assocparams
))
2566 if (copy_from_user(&assocparams
, optval
, optlen
))
2569 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2571 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2574 /* Set the values to the specific association */
2576 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2579 struct list_head
*pos
;
2580 struct sctp_transport
*peer_addr
;
2582 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2583 peer_addr
= list_entry(pos
,
2584 struct sctp_transport
,
2586 path_sum
+= peer_addr
->pathmaxrxt
;
2590 /* Only validate asocmaxrxt if we have more then
2591 * one path/transport. We do this because path
2592 * retransmissions are only counted when we have more
2596 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2599 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2602 if (assocparams
.sasoc_cookie_life
!= 0) {
2603 asoc
->cookie_life
.tv_sec
=
2604 assocparams
.sasoc_cookie_life
/ 1000;
2605 asoc
->cookie_life
.tv_usec
=
2606 (assocparams
.sasoc_cookie_life
% 1000)
2610 /* Set the values to the endpoint */
2611 struct sctp_sock
*sp
= sctp_sk(sk
);
2613 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2614 sp
->assocparams
.sasoc_asocmaxrxt
=
2615 assocparams
.sasoc_asocmaxrxt
;
2616 if (assocparams
.sasoc_cookie_life
!= 0)
2617 sp
->assocparams
.sasoc_cookie_life
=
2618 assocparams
.sasoc_cookie_life
;
2624 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2626 * This socket option is a boolean flag which turns on or off mapped V4
2627 * addresses. If this option is turned on and the socket is type
2628 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2629 * If this option is turned off, then no mapping will be done of V4
2630 * addresses and a user will receive both PF_INET6 and PF_INET type
2631 * addresses on the socket.
2633 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, int optlen
)
2636 struct sctp_sock
*sp
= sctp_sk(sk
);
2638 if (optlen
< sizeof(int))
2640 if (get_user(val
, (int __user
*)optval
))
2651 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2653 * This socket option specifies the maximum size to put in any outgoing
2654 * SCTP chunk. If a message is larger than this size it will be
2655 * fragmented by SCTP into the specified size. Note that the underlying
2656 * SCTP implementation may fragment into smaller sized chunks when the
2657 * PMTU of the underlying association is smaller than the value set by
2660 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, int optlen
)
2662 struct sctp_association
*asoc
;
2663 struct list_head
*pos
;
2664 struct sctp_sock
*sp
= sctp_sk(sk
);
2667 if (optlen
< sizeof(int))
2669 if (get_user(val
, (int __user
*)optval
))
2671 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2673 sp
->user_frag
= val
;
2675 /* Update the frag_point of the existing associations. */
2676 list_for_each(pos
, &(sp
->ep
->asocs
)) {
2677 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
2678 asoc
->frag_point
= sctp_frag_point(sp
, asoc
->pathmtu
);
2686 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2688 * Requests that the peer mark the enclosed address as the association
2689 * primary. The enclosed address must be one of the association's
2690 * locally bound addresses. The following structure is used to make a
2691 * set primary request:
2693 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2696 struct sctp_sock
*sp
;
2697 struct sctp_endpoint
*ep
;
2698 struct sctp_association
*asoc
= NULL
;
2699 struct sctp_setpeerprim prim
;
2700 struct sctp_chunk
*chunk
;
2706 if (!sctp_addip_enable
)
2709 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2712 if (copy_from_user(&prim
, optval
, optlen
))
2715 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2719 if (!asoc
->peer
.asconf_capable
)
2722 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2725 if (!sctp_state(asoc
, ESTABLISHED
))
2728 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2729 return -EADDRNOTAVAIL
;
2731 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2732 chunk
= sctp_make_asconf_set_prim(asoc
,
2733 (union sctp_addr
*)&prim
.sspp_addr
);
2737 err
= sctp_send_asconf(asoc
, chunk
);
2739 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2744 static int sctp_setsockopt_adaption_layer(struct sock
*sk
, char __user
*optval
,
2747 struct sctp_setadaption adaption
;
2749 if (optlen
!= sizeof(struct sctp_setadaption
))
2751 if (copy_from_user(&adaption
, optval
, optlen
))
2754 sctp_sk(sk
)->adaption_ind
= adaption
.ssb_adaption_ind
;
2759 /* API 6.2 setsockopt(), getsockopt()
2761 * Applications use setsockopt() and getsockopt() to set or retrieve
2762 * socket options. Socket options are used to change the default
2763 * behavior of sockets calls. They are described in Section 7.
2767 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
2768 * int __user *optlen);
2769 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
2772 * sd - the socket descript.
2773 * level - set to IPPROTO_SCTP for all SCTP options.
2774 * optname - the option name.
2775 * optval - the buffer to store the value of the option.
2776 * optlen - the size of the buffer.
2778 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
2779 char __user
*optval
, int optlen
)
2783 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
2786 /* I can hardly begin to describe how wrong this is. This is
2787 * so broken as to be worse than useless. The API draft
2788 * REALLY is NOT helpful here... I am not convinced that the
2789 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
2790 * are at all well-founded.
2792 if (level
!= SOL_SCTP
) {
2793 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
2794 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2801 case SCTP_SOCKOPT_BINDX_ADD
:
2802 /* 'optlen' is the size of the addresses buffer. */
2803 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2804 optlen
, SCTP_BINDX_ADD_ADDR
);
2807 case SCTP_SOCKOPT_BINDX_REM
:
2808 /* 'optlen' is the size of the addresses buffer. */
2809 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2810 optlen
, SCTP_BINDX_REM_ADDR
);
2813 case SCTP_SOCKOPT_CONNECTX
:
2814 /* 'optlen' is the size of the addresses buffer. */
2815 retval
= sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)optval
,
2819 case SCTP_DISABLE_FRAGMENTS
:
2820 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
2824 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
2827 case SCTP_AUTOCLOSE
:
2828 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
2831 case SCTP_PEER_ADDR_PARAMS
:
2832 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
2835 case SCTP_DELAYED_ACK_TIME
:
2836 retval
= sctp_setsockopt_delayed_ack_time(sk
, optval
, optlen
);
2840 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
2842 case SCTP_DEFAULT_SEND_PARAM
:
2843 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
2846 case SCTP_PRIMARY_ADDR
:
2847 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
2849 case SCTP_SET_PEER_PRIMARY_ADDR
:
2850 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
2853 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
2856 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
2858 case SCTP_ASSOCINFO
:
2859 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
2861 case SCTP_I_WANT_MAPPED_V4_ADDR
:
2862 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
2865 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
2867 case SCTP_ADAPTION_LAYER
:
2868 retval
= sctp_setsockopt_adaption_layer(sk
, optval
, optlen
);
2872 retval
= -ENOPROTOOPT
;
2876 sctp_release_sock(sk
);
2882 /* API 3.1.6 connect() - UDP Style Syntax
2884 * An application may use the connect() call in the UDP model to initiate an
2885 * association without sending data.
2889 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
2891 * sd: the socket descriptor to have a new association added to.
2893 * nam: the address structure (either struct sockaddr_in or struct
2894 * sockaddr_in6 defined in RFC2553 [7]).
2896 * len: the size of the address.
2898 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
2906 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
2907 __FUNCTION__
, sk
, addr
, addr_len
);
2909 /* Validate addr_len before calling common connect/connectx routine. */
2910 af
= sctp_get_af_specific(addr
->sa_family
);
2911 if (!af
|| addr_len
< af
->sockaddr_len
) {
2914 /* Pass correct addr len to common routine (so it knows there
2915 * is only one address being passed.
2917 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
);
2920 sctp_release_sock(sk
);
2924 /* FIXME: Write comments. */
2925 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
2927 return -EOPNOTSUPP
; /* STUB */
2930 /* 4.1.4 accept() - TCP Style Syntax
2932 * Applications use accept() call to remove an established SCTP
2933 * association from the accept queue of the endpoint. A new socket
2934 * descriptor will be returned from accept() to represent the newly
2935 * formed association.
2937 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
2939 struct sctp_sock
*sp
;
2940 struct sctp_endpoint
*ep
;
2941 struct sock
*newsk
= NULL
;
2942 struct sctp_association
*asoc
;
2951 if (!sctp_style(sk
, TCP
)) {
2952 error
= -EOPNOTSUPP
;
2956 if (!sctp_sstate(sk
, LISTENING
)) {
2961 timeo
= sock_rcvtimeo(sk
, sk
->sk_socket
->file
->f_flags
& O_NONBLOCK
);
2963 error
= sctp_wait_for_accept(sk
, timeo
);
2967 /* We treat the list of associations on the endpoint as the accept
2968 * queue and pick the first association on the list.
2970 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
2972 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
2978 /* Populate the fields of the newsk from the oldsk and migrate the
2979 * asoc to the newsk.
2981 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
2984 sctp_release_sock(sk
);
2989 /* The SCTP ioctl handler. */
2990 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
2992 return -ENOIOCTLCMD
;
2995 /* This is the function which gets called during socket creation to
2996 * initialized the SCTP-specific portion of the sock.
2997 * The sock structure should already be zero-filled memory.
2999 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
3001 struct sctp_endpoint
*ep
;
3002 struct sctp_sock
*sp
;
3004 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3008 /* Initialize the SCTP per socket area. */
3009 switch (sk
->sk_type
) {
3010 case SOCK_SEQPACKET
:
3011 sp
->type
= SCTP_SOCKET_UDP
;
3014 sp
->type
= SCTP_SOCKET_TCP
;
3017 return -ESOCKTNOSUPPORT
;
3020 /* Initialize default send parameters. These parameters can be
3021 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3023 sp
->default_stream
= 0;
3024 sp
->default_ppid
= 0;
3025 sp
->default_flags
= 0;
3026 sp
->default_context
= 0;
3027 sp
->default_timetolive
= 0;
3029 /* Initialize default setup parameters. These parameters
3030 * can be modified with the SCTP_INITMSG socket option or
3031 * overridden by the SCTP_INIT CMSG.
3033 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3034 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3035 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3036 sp
->initmsg
.sinit_max_init_timeo
= jiffies_to_msecs(sctp_rto_max
);
3038 /* Initialize default RTO related parameters. These parameters can
3039 * be modified for with the SCTP_RTOINFO socket option.
3041 sp
->rtoinfo
.srto_initial
= jiffies_to_msecs(sctp_rto_initial
);
3042 sp
->rtoinfo
.srto_max
= jiffies_to_msecs(sctp_rto_max
);
3043 sp
->rtoinfo
.srto_min
= jiffies_to_msecs(sctp_rto_min
);
3045 /* Initialize default association related parameters. These parameters
3046 * can be modified with the SCTP_ASSOCINFO socket option.
3048 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3049 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3050 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3051 sp
->assocparams
.sasoc_local_rwnd
= 0;
3052 sp
->assocparams
.sasoc_cookie_life
=
3053 jiffies_to_msecs(sctp_valid_cookie_life
);
3055 /* Initialize default event subscriptions. By default, all the
3058 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3060 /* Default Peer Address Parameters. These defaults can
3061 * be modified via SCTP_PEER_ADDR_PARAMS
3063 sp
->hbinterval
= jiffies_to_msecs(sctp_hb_interval
);
3064 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3065 sp
->pathmtu
= 0; // allow default discovery
3066 sp
->sackdelay
= jiffies_to_msecs(sctp_sack_timeout
);
3067 sp
->param_flags
= SPP_HB_ENABLE
|
3069 SPP_SACKDELAY_ENABLE
;
3071 /* If enabled no SCTP message fragmentation will be performed.
3072 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3074 sp
->disable_fragments
= 0;
3076 /* Turn on/off any Nagle-like algorithm. */
3079 /* Enable by default. */
3082 /* Auto-close idle associations after the configured
3083 * number of seconds. A value of 0 disables this
3084 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3085 * for UDP-style sockets only.
3089 /* User specified fragmentation limit. */
3092 sp
->adaption_ind
= 0;
3094 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3096 /* Control variables for partial data delivery. */
3098 skb_queue_head_init(&sp
->pd_lobby
);
3100 /* Create a per socket endpoint structure. Even if we
3101 * change the data structure relationships, this may still
3102 * be useful for storing pre-connect address information.
3104 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3111 SCTP_DBG_OBJCNT_INC(sock
);
3115 /* Cleanup any SCTP per socket resources. */
3116 SCTP_STATIC
int sctp_destroy_sock(struct sock
*sk
)
3118 struct sctp_endpoint
*ep
;
3120 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3122 /* Release our hold on the endpoint. */
3123 ep
= sctp_sk(sk
)->ep
;
3124 sctp_endpoint_free(ep
);
3129 /* API 4.1.7 shutdown() - TCP Style Syntax
3130 * int shutdown(int socket, int how);
3132 * sd - the socket descriptor of the association to be closed.
3133 * how - Specifies the type of shutdown. The values are
3136 * Disables further receive operations. No SCTP
3137 * protocol action is taken.
3139 * Disables further send operations, and initiates
3140 * the SCTP shutdown sequence.
3142 * Disables further send and receive operations
3143 * and initiates the SCTP shutdown sequence.
3145 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3147 struct sctp_endpoint
*ep
;
3148 struct sctp_association
*asoc
;
3150 if (!sctp_style(sk
, TCP
))
3153 if (how
& SEND_SHUTDOWN
) {
3154 ep
= sctp_sk(sk
)->ep
;
3155 if (!list_empty(&ep
->asocs
)) {
3156 asoc
= list_entry(ep
->asocs
.next
,
3157 struct sctp_association
, asocs
);
3158 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3163 /* 7.2.1 Association Status (SCTP_STATUS)
3165 * Applications can retrieve current status information about an
3166 * association, including association state, peer receiver window size,
3167 * number of unacked data chunks, and number of data chunks pending
3168 * receipt. This information is read-only.
3170 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3171 char __user
*optval
,
3174 struct sctp_status status
;
3175 struct sctp_association
*asoc
= NULL
;
3176 struct sctp_transport
*transport
;
3177 sctp_assoc_t associd
;
3180 if (len
!= sizeof(status
)) {
3185 if (copy_from_user(&status
, optval
, sizeof(status
))) {
3190 associd
= status
.sstat_assoc_id
;
3191 asoc
= sctp_id2assoc(sk
, associd
);
3197 transport
= asoc
->peer
.primary_path
;
3199 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3200 status
.sstat_state
= asoc
->state
;
3201 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3202 status
.sstat_unackdata
= asoc
->unack_data
;
3204 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3205 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3206 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3207 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3208 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3209 memcpy(&status
.sstat_primary
.spinfo_address
,
3210 &(transport
->ipaddr
), sizeof(union sctp_addr
));
3211 /* Map ipv4 address into v4-mapped-on-v6 address. */
3212 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3213 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3214 status
.sstat_primary
.spinfo_state
= transport
->state
;
3215 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3216 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3217 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3218 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3220 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3221 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3223 if (put_user(len
, optlen
)) {
3228 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3229 len
, status
.sstat_state
, status
.sstat_rwnd
,
3230 status
.sstat_assoc_id
);
3232 if (copy_to_user(optval
, &status
, len
)) {
3242 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3244 * Applications can retrieve information about a specific peer address
3245 * of an association, including its reachability state, congestion
3246 * window, and retransmission timer values. This information is
3249 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3250 char __user
*optval
,
3253 struct sctp_paddrinfo pinfo
;
3254 struct sctp_transport
*transport
;
3257 if (len
!= sizeof(pinfo
)) {
3262 if (copy_from_user(&pinfo
, optval
, sizeof(pinfo
))) {
3267 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3268 pinfo
.spinfo_assoc_id
);
3272 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3273 pinfo
.spinfo_state
= transport
->state
;
3274 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3275 pinfo
.spinfo_srtt
= transport
->srtt
;
3276 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3277 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3279 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3280 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3282 if (put_user(len
, optlen
)) {
3287 if (copy_to_user(optval
, &pinfo
, len
)) {
3296 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3298 * This option is a on/off flag. If enabled no SCTP message
3299 * fragmentation will be performed. Instead if a message being sent
3300 * exceeds the current PMTU size, the message will NOT be sent and
3301 * instead a error will be indicated to the user.
3303 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3304 char __user
*optval
, int __user
*optlen
)
3308 if (len
< sizeof(int))
3312 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3313 if (put_user(len
, optlen
))
3315 if (copy_to_user(optval
, &val
, len
))
3320 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3322 * This socket option is used to specify various notifications and
3323 * ancillary data the user wishes to receive.
3325 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
3328 if (len
!= sizeof(struct sctp_event_subscribe
))
3330 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
3335 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3337 * This socket option is applicable to the UDP-style socket only. When
3338 * set it will cause associations that are idle for more than the
3339 * specified number of seconds to automatically close. An association
3340 * being idle is defined an association that has NOT sent or received
3341 * user data. The special value of '0' indicates that no automatic
3342 * close of any associations should be performed. The option expects an
3343 * integer defining the number of seconds of idle time before an
3344 * association is closed.
3346 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3348 /* Applicable to UDP-style socket only */
3349 if (sctp_style(sk
, TCP
))
3351 if (len
!= sizeof(int))
3353 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, len
))
3358 /* Helper routine to branch off an association to a new socket. */
3359 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3360 struct socket
**sockp
)
3362 struct sock
*sk
= asoc
->base
.sk
;
3363 struct socket
*sock
;
3366 /* An association cannot be branched off from an already peeled-off
3367 * socket, nor is this supported for tcp style sockets.
3369 if (!sctp_style(sk
, UDP
))
3372 /* Create a new socket. */
3373 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
3377 /* Populate the fields of the newsk from the oldsk and migrate the
3378 * asoc to the newsk.
3380 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
3386 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3388 sctp_peeloff_arg_t peeloff
;
3389 struct socket
*newsock
;
3391 struct sctp_association
*asoc
;
3393 if (len
!= sizeof(sctp_peeloff_arg_t
))
3395 if (copy_from_user(&peeloff
, optval
, len
))
3398 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
3404 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __FUNCTION__
, sk
, asoc
);
3406 retval
= sctp_do_peeloff(asoc
, &newsock
);
3410 /* Map the socket to an unused fd that can be returned to the user. */
3411 retval
= sock_map_fd(newsock
);
3413 sock_release(newsock
);
3417 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3418 __FUNCTION__
, sk
, asoc
, newsock
->sk
, retval
);
3420 /* Return the fd mapped to the new socket. */
3421 peeloff
.sd
= retval
;
3422 if (copy_to_user(optval
, &peeloff
, len
))
3429 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3431 * Applications can enable or disable heartbeats for any peer address of
3432 * an association, modify an address's heartbeat interval, force a
3433 * heartbeat to be sent immediately, and adjust the address's maximum
3434 * number of retransmissions sent before an address is considered
3435 * unreachable. The following structure is used to access and modify an
3436 * address's parameters:
3438 * struct sctp_paddrparams {
3439 * sctp_assoc_t spp_assoc_id;
3440 * struct sockaddr_storage spp_address;
3441 * uint32_t spp_hbinterval;
3442 * uint16_t spp_pathmaxrxt;
3443 * uint32_t spp_pathmtu;
3444 * uint32_t spp_sackdelay;
3445 * uint32_t spp_flags;
3448 * spp_assoc_id - (one-to-many style socket) This is filled in the
3449 * application, and identifies the association for
3451 * spp_address - This specifies which address is of interest.
3452 * spp_hbinterval - This contains the value of the heartbeat interval,
3453 * in milliseconds. If a value of zero
3454 * is present in this field then no changes are to
3455 * be made to this parameter.
3456 * spp_pathmaxrxt - This contains the maximum number of
3457 * retransmissions before this address shall be
3458 * considered unreachable. If a value of zero
3459 * is present in this field then no changes are to
3460 * be made to this parameter.
3461 * spp_pathmtu - When Path MTU discovery is disabled the value
3462 * specified here will be the "fixed" path mtu.
3463 * Note that if the spp_address field is empty
3464 * then all associations on this address will
3465 * have this fixed path mtu set upon them.
3467 * spp_sackdelay - When delayed sack is enabled, this value specifies
3468 * the number of milliseconds that sacks will be delayed
3469 * for. This value will apply to all addresses of an
3470 * association if the spp_address field is empty. Note
3471 * also, that if delayed sack is enabled and this
3472 * value is set to 0, no change is made to the last
3473 * recorded delayed sack timer value.
3475 * spp_flags - These flags are used to control various features
3476 * on an association. The flag field may contain
3477 * zero or more of the following options.
3479 * SPP_HB_ENABLE - Enable heartbeats on the
3480 * specified address. Note that if the address
3481 * field is empty all addresses for the association
3482 * have heartbeats enabled upon them.
3484 * SPP_HB_DISABLE - Disable heartbeats on the
3485 * speicifed address. Note that if the address
3486 * field is empty all addresses for the association
3487 * will have their heartbeats disabled. Note also
3488 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
3489 * mutually exclusive, only one of these two should
3490 * be specified. Enabling both fields will have
3491 * undetermined results.
3493 * SPP_HB_DEMAND - Request a user initiated heartbeat
3494 * to be made immediately.
3496 * SPP_PMTUD_ENABLE - This field will enable PMTU
3497 * discovery upon the specified address. Note that
3498 * if the address feild is empty then all addresses
3499 * on the association are effected.
3501 * SPP_PMTUD_DISABLE - This field will disable PMTU
3502 * discovery upon the specified address. Note that
3503 * if the address feild is empty then all addresses
3504 * on the association are effected. Not also that
3505 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
3506 * exclusive. Enabling both will have undetermined
3509 * SPP_SACKDELAY_ENABLE - Setting this flag turns
3510 * on delayed sack. The time specified in spp_sackdelay
3511 * is used to specify the sack delay for this address. Note
3512 * that if spp_address is empty then all addresses will
3513 * enable delayed sack and take on the sack delay
3514 * value specified in spp_sackdelay.
3515 * SPP_SACKDELAY_DISABLE - Setting this flag turns
3516 * off delayed sack. If the spp_address field is blank then
3517 * delayed sack is disabled for the entire association. Note
3518 * also that this field is mutually exclusive to
3519 * SPP_SACKDELAY_ENABLE, setting both will have undefined
3522 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
3523 char __user
*optval
, int __user
*optlen
)
3525 struct sctp_paddrparams params
;
3526 struct sctp_transport
*trans
= NULL
;
3527 struct sctp_association
*asoc
= NULL
;
3528 struct sctp_sock
*sp
= sctp_sk(sk
);
3530 if (len
!= sizeof(struct sctp_paddrparams
))
3533 if (copy_from_user(¶ms
, optval
, len
))
3536 /* If an address other than INADDR_ANY is specified, and
3537 * no transport is found, then the request is invalid.
3539 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
3540 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
3541 params
.spp_assoc_id
);
3543 SCTP_DEBUG_PRINTK("Failed no transport\n");
3548 /* Get association, if assoc_id != 0 and the socket is a one
3549 * to many style socket, and an association was not found, then
3550 * the id was invalid.
3552 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
3553 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
3554 SCTP_DEBUG_PRINTK("Failed no association\n");
3559 /* Fetch transport values. */
3560 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
3561 params
.spp_pathmtu
= trans
->pathmtu
;
3562 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
3563 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
3565 /*draft-11 doesn't say what to return in spp_flags*/
3566 params
.spp_flags
= trans
->param_flags
;
3568 /* Fetch association values. */
3569 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
3570 params
.spp_pathmtu
= asoc
->pathmtu
;
3571 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
3572 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
3574 /*draft-11 doesn't say what to return in spp_flags*/
3575 params
.spp_flags
= asoc
->param_flags
;
3577 /* Fetch socket values. */
3578 params
.spp_hbinterval
= sp
->hbinterval
;
3579 params
.spp_pathmtu
= sp
->pathmtu
;
3580 params
.spp_sackdelay
= sp
->sackdelay
;
3581 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
3583 /*draft-11 doesn't say what to return in spp_flags*/
3584 params
.spp_flags
= sp
->param_flags
;
3587 if (copy_to_user(optval
, ¶ms
, len
))
3590 if (put_user(len
, optlen
))
3596 /* 7.1.24. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
3598 * This options will get or set the delayed ack timer. The time is set
3599 * in milliseconds. If the assoc_id is 0, then this sets or gets the
3600 * endpoints default delayed ack timer value. If the assoc_id field is
3601 * non-zero, then the set or get effects the specified association.
3603 * struct sctp_assoc_value {
3604 * sctp_assoc_t assoc_id;
3605 * uint32_t assoc_value;
3608 * assoc_id - This parameter, indicates which association the
3609 * user is preforming an action upon. Note that if
3610 * this field's value is zero then the endpoints
3611 * default value is changed (effecting future
3612 * associations only).
3614 * assoc_value - This parameter contains the number of milliseconds
3615 * that the user is requesting the delayed ACK timer
3616 * be set to. Note that this value is defined in
3617 * the standard to be between 200 and 500 milliseconds.
3619 * Note: a value of zero will leave the value alone,
3620 * but disable SACK delay. A non-zero value will also
3621 * enable SACK delay.
3623 static int sctp_getsockopt_delayed_ack_time(struct sock
*sk
, int len
,
3624 char __user
*optval
,
3627 struct sctp_assoc_value params
;
3628 struct sctp_association
*asoc
= NULL
;
3629 struct sctp_sock
*sp
= sctp_sk(sk
);
3631 if (len
!= sizeof(struct sctp_assoc_value
))
3634 if (copy_from_user(¶ms
, optval
, len
))
3637 /* Get association, if assoc_id != 0 and the socket is a one
3638 * to many style socket, and an association was not found, then
3639 * the id was invalid.
3641 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3642 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
3646 /* Fetch association values. */
3647 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
)
3648 params
.assoc_value
= jiffies_to_msecs(
3651 params
.assoc_value
= 0;
3653 /* Fetch socket values. */
3654 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
)
3655 params
.assoc_value
= sp
->sackdelay
;
3657 params
.assoc_value
= 0;
3660 if (copy_to_user(optval
, ¶ms
, len
))
3663 if (put_user(len
, optlen
))
3669 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
3671 * Applications can specify protocol parameters for the default association
3672 * initialization. The option name argument to setsockopt() and getsockopt()
3675 * Setting initialization parameters is effective only on an unconnected
3676 * socket (for UDP-style sockets only future associations are effected
3677 * by the change). With TCP-style sockets, this option is inherited by
3678 * sockets derived from a listener socket.
3680 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3682 if (len
!= sizeof(struct sctp_initmsg
))
3684 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
3689 static int sctp_getsockopt_peer_addrs_num_old(struct sock
*sk
, int len
,
3690 char __user
*optval
,
3694 struct sctp_association
*asoc
;
3695 struct list_head
*pos
;
3698 if (len
!= sizeof(sctp_assoc_t
))
3701 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
3704 /* For UDP-style sockets, id specifies the association to query. */
3705 asoc
= sctp_id2assoc(sk
, id
);
3709 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3717 * Old API for getting list of peer addresses. Does not work for 32-bit
3718 * programs running on a 64-bit kernel
3720 static int sctp_getsockopt_peer_addrs_old(struct sock
*sk
, int len
,
3721 char __user
*optval
,
3724 struct sctp_association
*asoc
;
3725 struct list_head
*pos
;
3727 struct sctp_getaddrs_old getaddrs
;
3728 struct sctp_transport
*from
;
3730 union sctp_addr temp
;
3731 struct sctp_sock
*sp
= sctp_sk(sk
);
3734 if (len
!= sizeof(struct sctp_getaddrs_old
))
3737 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs_old
)))
3740 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
3742 /* For UDP-style sockets, id specifies the association to query. */
3743 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3747 to
= (void __user
*)getaddrs
.addrs
;
3748 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3749 from
= list_entry(pos
, struct sctp_transport
, transports
);
3750 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
3751 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3752 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3753 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3754 if (copy_to_user(to
, &temp
, addrlen
))
3758 if (cnt
>= getaddrs
.addr_num
) break;
3760 getaddrs
.addr_num
= cnt
;
3761 if (copy_to_user(optval
, &getaddrs
, sizeof(struct sctp_getaddrs_old
)))
3767 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
3768 char __user
*optval
, int __user
*optlen
)
3770 struct sctp_association
*asoc
;
3771 struct list_head
*pos
;
3773 struct sctp_getaddrs getaddrs
;
3774 struct sctp_transport
*from
;
3776 union sctp_addr temp
;
3777 struct sctp_sock
*sp
= sctp_sk(sk
);
3782 if (len
< sizeof(struct sctp_getaddrs
))
3785 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
3788 /* For UDP-style sockets, id specifies the association to query. */
3789 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3793 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
3794 space_left
= len
- sizeof(struct sctp_getaddrs
) -
3795 offsetof(struct sctp_getaddrs
,addrs
);
3797 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3798 from
= list_entry(pos
, struct sctp_transport
, transports
);
3799 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
3800 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3801 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3802 if(space_left
< addrlen
)
3804 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3805 if (copy_to_user(to
, &temp
, addrlen
))
3809 space_left
-= addrlen
;
3812 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
3814 bytes_copied
= ((char __user
*)to
) - optval
;
3815 if (put_user(bytes_copied
, optlen
))
3821 static int sctp_getsockopt_local_addrs_num_old(struct sock
*sk
, int len
,
3822 char __user
*optval
,
3826 struct sctp_bind_addr
*bp
;
3827 struct sctp_association
*asoc
;
3828 struct list_head
*pos
;
3829 struct sctp_sockaddr_entry
*addr
;
3830 rwlock_t
*addr_lock
;
3831 unsigned long flags
;
3834 if (len
!= sizeof(sctp_assoc_t
))
3837 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
3841 * For UDP-style sockets, id specifies the association to query.
3842 * If the id field is set to the value '0' then the locally bound
3843 * addresses are returned without regard to any particular
3847 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
3848 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
3850 asoc
= sctp_id2assoc(sk
, id
);
3853 bp
= &asoc
->base
.bind_addr
;
3854 addr_lock
= &asoc
->base
.addr_lock
;
3857 sctp_read_lock(addr_lock
);
3859 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
3860 * addresses from the global local address list.
3862 if (sctp_list_single_entry(&bp
->address_list
)) {
3863 addr
= list_entry(bp
->address_list
.next
,
3864 struct sctp_sockaddr_entry
, list
);
3865 if (sctp_is_any(&addr
->a
)) {
3866 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3867 list_for_each(pos
, &sctp_local_addr_list
) {
3868 addr
= list_entry(pos
,
3869 struct sctp_sockaddr_entry
,
3871 if ((PF_INET
== sk
->sk_family
) &&
3872 (AF_INET6
== addr
->a
.sa
.sa_family
))
3876 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3884 list_for_each(pos
, &bp
->address_list
) {
3889 sctp_read_unlock(addr_lock
);
3893 /* Helper function that copies local addresses to user and returns the number
3894 * of addresses copied.
3896 static int sctp_copy_laddrs_to_user_old(struct sock
*sk
, __u16 port
, int max_addrs
,
3899 struct list_head
*pos
;
3900 struct sctp_sockaddr_entry
*addr
;
3901 unsigned long flags
;
3902 union sctp_addr temp
;
3906 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3907 list_for_each(pos
, &sctp_local_addr_list
) {
3908 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3909 if ((PF_INET
== sk
->sk_family
) &&
3910 (AF_INET6
== addr
->a
.sa
.sa_family
))
3912 memcpy(&temp
, &addr
->a
, sizeof(temp
));
3913 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3915 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3916 temp
.v4
.sin_port
= htons(port
);
3917 if (copy_to_user(to
, &temp
, addrlen
)) {
3918 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3924 if (cnt
>= max_addrs
) break;
3926 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
3931 static int sctp_copy_laddrs_to_user(struct sock
*sk
, __u16 port
,
3932 void __user
**to
, size_t space_left
)
3934 struct list_head
*pos
;
3935 struct sctp_sockaddr_entry
*addr
;
3936 unsigned long flags
;
3937 union sctp_addr temp
;
3941 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3942 list_for_each(pos
, &sctp_local_addr_list
) {
3943 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3944 if ((PF_INET
== sk
->sk_family
) &&
3945 (AF_INET6
== addr
->a
.sa
.sa_family
))
3947 memcpy(&temp
, &addr
->a
, sizeof(temp
));
3948 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3950 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3951 if(space_left
<addrlen
)
3953 temp
.v4
.sin_port
= htons(port
);
3954 if (copy_to_user(*to
, &temp
, addrlen
)) {
3955 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3961 space_left
-= addrlen
;
3963 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
3968 /* Old API for getting list of local addresses. Does not work for 32-bit
3969 * programs running on a 64-bit kernel
3971 static int sctp_getsockopt_local_addrs_old(struct sock
*sk
, int len
,
3972 char __user
*optval
, int __user
*optlen
)
3974 struct sctp_bind_addr
*bp
;
3975 struct sctp_association
*asoc
;
3976 struct list_head
*pos
;
3978 struct sctp_getaddrs_old getaddrs
;
3979 struct sctp_sockaddr_entry
*addr
;
3981 union sctp_addr temp
;
3982 struct sctp_sock
*sp
= sctp_sk(sk
);
3984 rwlock_t
*addr_lock
;
3987 if (len
!= sizeof(struct sctp_getaddrs_old
))
3990 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs_old
)))
3993 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
3995 * For UDP-style sockets, id specifies the association to query.
3996 * If the id field is set to the value '0' then the locally bound
3997 * addresses are returned without regard to any particular
4000 if (0 == getaddrs
.assoc_id
) {
4001 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4002 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4004 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4007 bp
= &asoc
->base
.bind_addr
;
4008 addr_lock
= &asoc
->base
.addr_lock
;
4011 to
= getaddrs
.addrs
;
4013 sctp_read_lock(addr_lock
);
4015 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4016 * addresses from the global local address list.
4018 if (sctp_list_single_entry(&bp
->address_list
)) {
4019 addr
= list_entry(bp
->address_list
.next
,
4020 struct sctp_sockaddr_entry
, list
);
4021 if (sctp_is_any(&addr
->a
)) {
4022 cnt
= sctp_copy_laddrs_to_user_old(sk
, bp
->port
,
4033 list_for_each(pos
, &bp
->address_list
) {
4034 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4035 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4036 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4037 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4038 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
4039 if (copy_to_user(to
, &temp
, addrlen
)) {
4045 if (cnt
>= getaddrs
.addr_num
) break;
4049 getaddrs
.addr_num
= cnt
;
4050 if (copy_to_user(optval
, &getaddrs
, sizeof(struct sctp_getaddrs_old
)))
4054 sctp_read_unlock(addr_lock
);
4058 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4059 char __user
*optval
, int __user
*optlen
)
4061 struct sctp_bind_addr
*bp
;
4062 struct sctp_association
*asoc
;
4063 struct list_head
*pos
;
4065 struct sctp_getaddrs getaddrs
;
4066 struct sctp_sockaddr_entry
*addr
;
4068 union sctp_addr temp
;
4069 struct sctp_sock
*sp
= sctp_sk(sk
);
4071 rwlock_t
*addr_lock
;
4076 if (len
<= sizeof(struct sctp_getaddrs
))
4079 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4083 * For UDP-style sockets, id specifies the association to query.
4084 * If the id field is set to the value '0' then the locally bound
4085 * addresses are returned without regard to any particular
4088 if (0 == getaddrs
.assoc_id
) {
4089 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4090 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4092 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4095 bp
= &asoc
->base
.bind_addr
;
4096 addr_lock
= &asoc
->base
.addr_lock
;
4099 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4100 space_left
= len
- sizeof(struct sctp_getaddrs
) -
4101 offsetof(struct sctp_getaddrs
,addrs
);
4103 sctp_read_lock(addr_lock
);
4105 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4106 * addresses from the global local address list.
4108 if (sctp_list_single_entry(&bp
->address_list
)) {
4109 addr
= list_entry(bp
->address_list
.next
,
4110 struct sctp_sockaddr_entry
, list
);
4111 if (sctp_is_any(&addr
->a
)) {
4112 cnt
= sctp_copy_laddrs_to_user(sk
, bp
->port
,
4122 list_for_each(pos
, &bp
->address_list
) {
4123 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4124 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4125 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4126 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4127 if(space_left
< addrlen
)
4128 return -ENOMEM
; /*fixme: right error?*/
4129 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
4130 if (copy_to_user(to
, &temp
, addrlen
)) {
4136 space_left
-= addrlen
;
4140 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4142 bytes_copied
= ((char __user
*)to
) - optval
;
4143 if (put_user(bytes_copied
, optlen
))
4147 sctp_read_unlock(addr_lock
);
4151 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4153 * Requests that the local SCTP stack use the enclosed peer address as
4154 * the association primary. The enclosed address must be one of the
4155 * association peer's addresses.
4157 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4158 char __user
*optval
, int __user
*optlen
)
4160 struct sctp_prim prim
;
4161 struct sctp_association
*asoc
;
4162 struct sctp_sock
*sp
= sctp_sk(sk
);
4164 if (len
!= sizeof(struct sctp_prim
))
4167 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
4170 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4174 if (!asoc
->peer
.primary_path
)
4177 asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
=
4178 htons(asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
);
4179 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4180 sizeof(union sctp_addr
));
4181 asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
=
4182 ntohs(asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
);
4184 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4185 (union sctp_addr
*)&prim
.ssp_addr
);
4187 if (copy_to_user(optval
, &prim
, sizeof(struct sctp_prim
)))
4194 * 7.1.11 Set Adaption Layer Indicator (SCTP_ADAPTION_LAYER)
4196 * Requests that the local endpoint set the specified Adaption Layer
4197 * Indication parameter for all future INIT and INIT-ACK exchanges.
4199 static int sctp_getsockopt_adaption_layer(struct sock
*sk
, int len
,
4200 char __user
*optval
, int __user
*optlen
)
4202 struct sctp_setadaption adaption
;
4204 if (len
!= sizeof(struct sctp_setadaption
))
4207 adaption
.ssb_adaption_ind
= sctp_sk(sk
)->adaption_ind
;
4208 if (copy_to_user(optval
, &adaption
, len
))
4216 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4218 * Applications that wish to use the sendto() system call may wish to
4219 * specify a default set of parameters that would normally be supplied
4220 * through the inclusion of ancillary data. This socket option allows
4221 * such an application to set the default sctp_sndrcvinfo structure.
4224 * The application that wishes to use this socket option simply passes
4225 * in to this call the sctp_sndrcvinfo structure defined in Section
4226 * 5.2.2) The input parameters accepted by this call include
4227 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4228 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4229 * to this call if the caller is using the UDP model.
4231 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4233 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4234 int len
, char __user
*optval
,
4237 struct sctp_sndrcvinfo info
;
4238 struct sctp_association
*asoc
;
4239 struct sctp_sock
*sp
= sctp_sk(sk
);
4241 if (len
!= sizeof(struct sctp_sndrcvinfo
))
4243 if (copy_from_user(&info
, optval
, sizeof(struct sctp_sndrcvinfo
)))
4246 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4247 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4251 info
.sinfo_stream
= asoc
->default_stream
;
4252 info
.sinfo_flags
= asoc
->default_flags
;
4253 info
.sinfo_ppid
= asoc
->default_ppid
;
4254 info
.sinfo_context
= asoc
->default_context
;
4255 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4257 info
.sinfo_stream
= sp
->default_stream
;
4258 info
.sinfo_flags
= sp
->default_flags
;
4259 info
.sinfo_ppid
= sp
->default_ppid
;
4260 info
.sinfo_context
= sp
->default_context
;
4261 info
.sinfo_timetolive
= sp
->default_timetolive
;
4264 if (copy_to_user(optval
, &info
, sizeof(struct sctp_sndrcvinfo
)))
4272 * 7.1.5 SCTP_NODELAY
4274 * Turn on/off any Nagle-like algorithm. This means that packets are
4275 * generally sent as soon as possible and no unnecessary delays are
4276 * introduced, at the cost of more packets in the network. Expects an
4277 * integer boolean flag.
4280 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4281 char __user
*optval
, int __user
*optlen
)
4285 if (len
< sizeof(int))
4289 val
= (sctp_sk(sk
)->nodelay
== 1);
4290 if (put_user(len
, optlen
))
4292 if (copy_to_user(optval
, &val
, len
))
4299 * 7.1.1 SCTP_RTOINFO
4301 * The protocol parameters used to initialize and bound retransmission
4302 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4303 * and modify these parameters.
4304 * All parameters are time values, in milliseconds. A value of 0, when
4305 * modifying the parameters, indicates that the current value should not
4309 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4310 char __user
*optval
,
4311 int __user
*optlen
) {
4312 struct sctp_rtoinfo rtoinfo
;
4313 struct sctp_association
*asoc
;
4315 if (len
!= sizeof (struct sctp_rtoinfo
))
4318 if (copy_from_user(&rtoinfo
, optval
, sizeof (struct sctp_rtoinfo
)))
4321 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4323 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4326 /* Values corresponding to the specific association. */
4328 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4329 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4330 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4332 /* Values corresponding to the endpoint. */
4333 struct sctp_sock
*sp
= sctp_sk(sk
);
4335 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4336 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4337 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4340 if (put_user(len
, optlen
))
4343 if (copy_to_user(optval
, &rtoinfo
, len
))
4351 * 7.1.2 SCTP_ASSOCINFO
4353 * This option is used to tune the the maximum retransmission attempts
4354 * of the association.
4355 * Returns an error if the new association retransmission value is
4356 * greater than the sum of the retransmission value of the peer.
4357 * See [SCTP] for more information.
4360 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4361 char __user
*optval
,
4365 struct sctp_assocparams assocparams
;
4366 struct sctp_association
*asoc
;
4367 struct list_head
*pos
;
4370 if (len
!= sizeof (struct sctp_assocparams
))
4373 if (copy_from_user(&assocparams
, optval
,
4374 sizeof (struct sctp_assocparams
)))
4377 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4379 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4382 /* Values correspoinding to the specific association */
4384 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4385 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4386 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4387 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4389 (asoc
->cookie_life
.tv_usec
4392 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4396 assocparams
.sasoc_number_peer_destinations
= cnt
;
4398 /* Values corresponding to the endpoint */
4399 struct sctp_sock
*sp
= sctp_sk(sk
);
4401 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4402 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4403 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4404 assocparams
.sasoc_cookie_life
=
4405 sp
->assocparams
.sasoc_cookie_life
;
4406 assocparams
.sasoc_number_peer_destinations
=
4408 sasoc_number_peer_destinations
;
4411 if (put_user(len
, optlen
))
4414 if (copy_to_user(optval
, &assocparams
, len
))
4421 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4423 * This socket option is a boolean flag which turns on or off mapped V4
4424 * addresses. If this option is turned on and the socket is type
4425 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4426 * If this option is turned off, then no mapping will be done of V4
4427 * addresses and a user will receive both PF_INET6 and PF_INET type
4428 * addresses on the socket.
4430 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
4431 char __user
*optval
, int __user
*optlen
)
4434 struct sctp_sock
*sp
= sctp_sk(sk
);
4436 if (len
< sizeof(int))
4441 if (put_user(len
, optlen
))
4443 if (copy_to_user(optval
, &val
, len
))
4450 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
4452 * This socket option specifies the maximum size to put in any outgoing
4453 * SCTP chunk. If a message is larger than this size it will be
4454 * fragmented by SCTP into the specified size. Note that the underlying
4455 * SCTP implementation may fragment into smaller sized chunks when the
4456 * PMTU of the underlying association is smaller than the value set by
4459 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
4460 char __user
*optval
, int __user
*optlen
)
4464 if (len
< sizeof(int))
4469 val
= sctp_sk(sk
)->user_frag
;
4470 if (put_user(len
, optlen
))
4472 if (copy_to_user(optval
, &val
, len
))
4478 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
4479 char __user
*optval
, int __user
*optlen
)
4484 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
4487 /* I can hardly begin to describe how wrong this is. This is
4488 * so broken as to be worse than useless. The API draft
4489 * REALLY is NOT helpful here... I am not convinced that the
4490 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
4491 * are at all well-founded.
4493 if (level
!= SOL_SCTP
) {
4494 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
4496 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
4500 if (get_user(len
, optlen
))
4507 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
4509 case SCTP_DISABLE_FRAGMENTS
:
4510 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
4514 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
4516 case SCTP_AUTOCLOSE
:
4517 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
4519 case SCTP_SOCKOPT_PEELOFF
:
4520 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
4522 case SCTP_PEER_ADDR_PARAMS
:
4523 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
4526 case SCTP_DELAYED_ACK_TIME
:
4527 retval
= sctp_getsockopt_delayed_ack_time(sk
, len
, optval
,
4531 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
4533 case SCTP_GET_PEER_ADDRS_NUM_OLD
:
4534 retval
= sctp_getsockopt_peer_addrs_num_old(sk
, len
, optval
,
4537 case SCTP_GET_LOCAL_ADDRS_NUM_OLD
:
4538 retval
= sctp_getsockopt_local_addrs_num_old(sk
, len
, optval
,
4541 case SCTP_GET_PEER_ADDRS_OLD
:
4542 retval
= sctp_getsockopt_peer_addrs_old(sk
, len
, optval
,
4545 case SCTP_GET_LOCAL_ADDRS_OLD
:
4546 retval
= sctp_getsockopt_local_addrs_old(sk
, len
, optval
,
4549 case SCTP_GET_PEER_ADDRS
:
4550 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
4553 case SCTP_GET_LOCAL_ADDRS
:
4554 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
4557 case SCTP_DEFAULT_SEND_PARAM
:
4558 retval
= sctp_getsockopt_default_send_param(sk
, len
,
4561 case SCTP_PRIMARY_ADDR
:
4562 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
4565 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
4568 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
4570 case SCTP_ASSOCINFO
:
4571 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
4573 case SCTP_I_WANT_MAPPED_V4_ADDR
:
4574 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
4577 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
4579 case SCTP_GET_PEER_ADDR_INFO
:
4580 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
4583 case SCTP_ADAPTION_LAYER
:
4584 retval
= sctp_getsockopt_adaption_layer(sk
, len
, optval
,
4588 retval
= -ENOPROTOOPT
;
4592 sctp_release_sock(sk
);
4596 static void sctp_hash(struct sock
*sk
)
4601 static void sctp_unhash(struct sock
*sk
)
4606 /* Check if port is acceptable. Possibly find first available port.
4608 * The port hash table (contained in the 'global' SCTP protocol storage
4609 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
4610 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
4611 * list (the list number is the port number hashed out, so as you
4612 * would expect from a hash function, all the ports in a given list have
4613 * such a number that hashes out to the same list number; you were
4614 * expecting that, right?); so each list has a set of ports, with a
4615 * link to the socket (struct sock) that uses it, the port number and
4616 * a fastreuse flag (FIXME: NPI ipg).
4618 static struct sctp_bind_bucket
*sctp_bucket_create(
4619 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
4621 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
4623 struct sctp_bind_hashbucket
*head
; /* hash list */
4624 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
4625 unsigned short snum
;
4628 /* NOTE: Remember to put this back to net order. */
4629 addr
->v4
.sin_port
= ntohs(addr
->v4
.sin_port
);
4630 snum
= addr
->v4
.sin_port
;
4632 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
4633 sctp_local_bh_disable();
4636 /* Search for an available port.
4638 * 'sctp_port_rover' was the last port assigned, so
4639 * we start to search from 'sctp_port_rover +
4640 * 1'. What we do is first check if port 'rover' is
4641 * already in the hash table; if not, we use that; if
4642 * it is, we try next.
4644 int low
= sysctl_local_port_range
[0];
4645 int high
= sysctl_local_port_range
[1];
4646 int remaining
= (high
- low
) + 1;
4650 sctp_spin_lock(&sctp_port_alloc_lock
);
4651 rover
= sctp_port_rover
;
4654 if ((rover
< low
) || (rover
> high
))
4656 index
= sctp_phashfn(rover
);
4657 head
= &sctp_port_hashtable
[index
];
4658 sctp_spin_lock(&head
->lock
);
4659 for (pp
= head
->chain
; pp
; pp
= pp
->next
)
4660 if (pp
->port
== rover
)
4664 sctp_spin_unlock(&head
->lock
);
4665 } while (--remaining
> 0);
4666 sctp_port_rover
= rover
;
4667 sctp_spin_unlock(&sctp_port_alloc_lock
);
4669 /* Exhausted local port range during search? */
4674 /* OK, here is the one we will use. HEAD (the port
4675 * hash table list entry) is non-NULL and we hold it's
4680 /* We are given an specific port number; we verify
4681 * that it is not being used. If it is used, we will
4682 * exahust the search in the hash list corresponding
4683 * to the port number (snum) - we detect that with the
4684 * port iterator, pp being NULL.
4686 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
4687 sctp_spin_lock(&head
->lock
);
4688 for (pp
= head
->chain
; pp
; pp
= pp
->next
) {
4689 if (pp
->port
== snum
)
4696 if (!hlist_empty(&pp
->owner
)) {
4697 /* We had a port hash table hit - there is an
4698 * available port (pp != NULL) and it is being
4699 * used by other socket (pp->owner not empty); that other
4700 * socket is going to be sk2.
4702 int reuse
= sk
->sk_reuse
;
4704 struct hlist_node
*node
;
4706 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
4707 if (pp
->fastreuse
&& sk
->sk_reuse
)
4710 /* Run through the list of sockets bound to the port
4711 * (pp->port) [via the pointers bind_next and
4712 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
4713 * we get the endpoint they describe and run through
4714 * the endpoint's list of IP (v4 or v6) addresses,
4715 * comparing each of the addresses with the address of
4716 * the socket sk. If we find a match, then that means
4717 * that this port/socket (sk) combination are already
4720 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
4721 struct sctp_endpoint
*ep2
;
4722 ep2
= sctp_sk(sk2
)->ep
;
4724 if (reuse
&& sk2
->sk_reuse
)
4727 if (sctp_bind_addr_match(&ep2
->base
.bind_addr
, addr
,
4733 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
4736 /* If there was a hash table miss, create a new port. */
4738 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
4741 /* In either case (hit or miss), make sure fastreuse is 1 only
4742 * if sk->sk_reuse is too (that is, if the caller requested
4743 * SO_REUSEADDR on this socket -sk-).
4745 if (hlist_empty(&pp
->owner
))
4746 pp
->fastreuse
= sk
->sk_reuse
? 1 : 0;
4747 else if (pp
->fastreuse
&& !sk
->sk_reuse
)
4750 /* We are set, so fill up all the data in the hash table
4751 * entry, tie the socket list information with the rest of the
4752 * sockets FIXME: Blurry, NPI (ipg).
4755 inet_sk(sk
)->num
= snum
;
4756 if (!sctp_sk(sk
)->bind_hash
) {
4757 sk_add_bind_node(sk
, &pp
->owner
);
4758 sctp_sk(sk
)->bind_hash
= pp
;
4763 sctp_spin_unlock(&head
->lock
);
4766 sctp_local_bh_enable();
4767 addr
->v4
.sin_port
= htons(addr
->v4
.sin_port
);
4771 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
4772 * port is requested.
4774 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
4777 union sctp_addr addr
;
4778 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
4780 /* Set up a dummy address struct from the sk. */
4781 af
->from_sk(&addr
, sk
);
4782 addr
.v4
.sin_port
= htons(snum
);
4784 /* Note: sk->sk_num gets filled in if ephemeral port request. */
4785 ret
= sctp_get_port_local(sk
, &addr
);
4787 return (ret
? 1 : 0);
4791 * 3.1.3 listen() - UDP Style Syntax
4793 * By default, new associations are not accepted for UDP style sockets.
4794 * An application uses listen() to mark a socket as being able to
4795 * accept new associations.
4797 SCTP_STATIC
int sctp_seqpacket_listen(struct sock
*sk
, int backlog
)
4799 struct sctp_sock
*sp
= sctp_sk(sk
);
4800 struct sctp_endpoint
*ep
= sp
->ep
;
4802 /* Only UDP style sockets that are not peeled off are allowed to
4805 if (!sctp_style(sk
, UDP
))
4808 /* If backlog is zero, disable listening. */
4810 if (sctp_sstate(sk
, CLOSED
))
4813 sctp_unhash_endpoint(ep
);
4814 sk
->sk_state
= SCTP_SS_CLOSED
;
4817 /* Return if we are already listening. */
4818 if (sctp_sstate(sk
, LISTENING
))
4822 * If a bind() or sctp_bindx() is not called prior to a listen()
4823 * call that allows new associations to be accepted, the system
4824 * picks an ephemeral port and will choose an address set equivalent
4825 * to binding with a wildcard address.
4827 * This is not currently spelled out in the SCTP sockets
4828 * extensions draft, but follows the practice as seen in TCP
4831 if (!ep
->base
.bind_addr
.port
) {
4832 if (sctp_autobind(sk
))
4835 sk
->sk_state
= SCTP_SS_LISTENING
;
4836 sctp_hash_endpoint(ep
);
4841 * 4.1.3 listen() - TCP Style Syntax
4843 * Applications uses listen() to ready the SCTP endpoint for accepting
4844 * inbound associations.
4846 SCTP_STATIC
int sctp_stream_listen(struct sock
*sk
, int backlog
)
4848 struct sctp_sock
*sp
= sctp_sk(sk
);
4849 struct sctp_endpoint
*ep
= sp
->ep
;
4851 /* If backlog is zero, disable listening. */
4853 if (sctp_sstate(sk
, CLOSED
))
4856 sctp_unhash_endpoint(ep
);
4857 sk
->sk_state
= SCTP_SS_CLOSED
;
4860 if (sctp_sstate(sk
, LISTENING
))
4864 * If a bind() or sctp_bindx() is not called prior to a listen()
4865 * call that allows new associations to be accepted, the system
4866 * picks an ephemeral port and will choose an address set equivalent
4867 * to binding with a wildcard address.
4869 * This is not currently spelled out in the SCTP sockets
4870 * extensions draft, but follows the practice as seen in TCP
4873 if (!ep
->base
.bind_addr
.port
) {
4874 if (sctp_autobind(sk
))
4877 sk
->sk_state
= SCTP_SS_LISTENING
;
4878 sk
->sk_max_ack_backlog
= backlog
;
4879 sctp_hash_endpoint(ep
);
4884 * Move a socket to LISTENING state.
4886 int sctp_inet_listen(struct socket
*sock
, int backlog
)
4888 struct sock
*sk
= sock
->sk
;
4889 struct crypto_tfm
*tfm
=NULL
;
4892 if (unlikely(backlog
< 0))
4897 if (sock
->state
!= SS_UNCONNECTED
)
4900 /* Allocate HMAC for generating cookie. */
4901 if (sctp_hmac_alg
) {
4902 tfm
= sctp_crypto_alloc_tfm(sctp_hmac_alg
, 0);
4909 switch (sock
->type
) {
4910 case SOCK_SEQPACKET
:
4911 err
= sctp_seqpacket_listen(sk
, backlog
);
4914 err
= sctp_stream_listen(sk
, backlog
);
4922 /* Store away the transform reference. */
4923 sctp_sk(sk
)->hmac
= tfm
;
4925 sctp_release_sock(sk
);
4928 sctp_crypto_free_tfm(tfm
);
4933 * This function is done by modeling the current datagram_poll() and the
4934 * tcp_poll(). Note that, based on these implementations, we don't
4935 * lock the socket in this function, even though it seems that,
4936 * ideally, locking or some other mechanisms can be used to ensure
4937 * the integrity of the counters (sndbuf and wmem_alloc) used
4938 * in this place. We assume that we don't need locks either until proven
4941 * Another thing to note is that we include the Async I/O support
4942 * here, again, by modeling the current TCP/UDP code. We don't have
4943 * a good way to test with it yet.
4945 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
4947 struct sock
*sk
= sock
->sk
;
4948 struct sctp_sock
*sp
= sctp_sk(sk
);
4951 poll_wait(file
, sk
->sk_sleep
, wait
);
4953 /* A TCP-style listening socket becomes readable when the accept queue
4956 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
4957 return (!list_empty(&sp
->ep
->asocs
)) ?
4958 (POLLIN
| POLLRDNORM
) : 0;
4962 /* Is there any exceptional events? */
4963 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
4965 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
4967 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
4970 /* Is it readable? Reconsider this code with TCP-style support. */
4971 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
4972 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
4973 mask
|= POLLIN
| POLLRDNORM
;
4975 /* The association is either gone or not ready. */
4976 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
4979 /* Is it writable? */
4980 if (sctp_writeable(sk
)) {
4981 mask
|= POLLOUT
| POLLWRNORM
;
4983 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
4985 * Since the socket is not locked, the buffer
4986 * might be made available after the writeable check and
4987 * before the bit is set. This could cause a lost I/O
4988 * signal. tcp_poll() has a race breaker for this race
4989 * condition. Based on their implementation, we put
4990 * in the following code to cover it as well.
4992 if (sctp_writeable(sk
))
4993 mask
|= POLLOUT
| POLLWRNORM
;
4998 /********************************************************************
4999 * 2nd Level Abstractions
5000 ********************************************************************/
5002 static struct sctp_bind_bucket
*sctp_bucket_create(
5003 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
5005 struct sctp_bind_bucket
*pp
;
5007 pp
= kmem_cache_alloc(sctp_bucket_cachep
, SLAB_ATOMIC
);
5008 SCTP_DBG_OBJCNT_INC(bind_bucket
);
5012 INIT_HLIST_HEAD(&pp
->owner
);
5013 if ((pp
->next
= head
->chain
) != NULL
)
5014 pp
->next
->pprev
= &pp
->next
;
5016 pp
->pprev
= &head
->chain
;
5021 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5022 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
5024 if (pp
&& hlist_empty(&pp
->owner
)) {
5026 pp
->next
->pprev
= pp
->pprev
;
5027 *(pp
->pprev
) = pp
->next
;
5028 kmem_cache_free(sctp_bucket_cachep
, pp
);
5029 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
5033 /* Release this socket's reference to a local port. */
5034 static inline void __sctp_put_port(struct sock
*sk
)
5036 struct sctp_bind_hashbucket
*head
=
5037 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->num
)];
5038 struct sctp_bind_bucket
*pp
;
5040 sctp_spin_lock(&head
->lock
);
5041 pp
= sctp_sk(sk
)->bind_hash
;
5042 __sk_del_bind_node(sk
);
5043 sctp_sk(sk
)->bind_hash
= NULL
;
5044 inet_sk(sk
)->num
= 0;
5045 sctp_bucket_destroy(pp
);
5046 sctp_spin_unlock(&head
->lock
);
5049 void sctp_put_port(struct sock
*sk
)
5051 sctp_local_bh_disable();
5052 __sctp_put_port(sk
);
5053 sctp_local_bh_enable();
5057 * The system picks an ephemeral port and choose an address set equivalent
5058 * to binding with a wildcard address.
5059 * One of those addresses will be the primary address for the association.
5060 * This automatically enables the multihoming capability of SCTP.
5062 static int sctp_autobind(struct sock
*sk
)
5064 union sctp_addr autoaddr
;
5066 unsigned short port
;
5068 /* Initialize a local sockaddr structure to INADDR_ANY. */
5069 af
= sctp_sk(sk
)->pf
->af
;
5071 port
= htons(inet_sk(sk
)->num
);
5072 af
->inaddr_any(&autoaddr
, port
);
5074 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5077 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5080 * 4.2 The cmsghdr Structure *
5082 * When ancillary data is sent or received, any number of ancillary data
5083 * objects can be specified by the msg_control and msg_controllen members of
5084 * the msghdr structure, because each object is preceded by
5085 * a cmsghdr structure defining the object's length (the cmsg_len member).
5086 * Historically Berkeley-derived implementations have passed only one object
5087 * at a time, but this API allows multiple objects to be
5088 * passed in a single call to sendmsg() or recvmsg(). The following example
5089 * shows two ancillary data objects in a control buffer.
5091 * |<--------------------------- msg_controllen -------------------------->|
5094 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5096 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5099 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5101 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5104 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5105 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5107 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5109 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5116 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
5117 sctp_cmsgs_t
*cmsgs
)
5119 struct cmsghdr
*cmsg
;
5121 for (cmsg
= CMSG_FIRSTHDR(msg
);
5123 cmsg
= CMSG_NXTHDR((struct msghdr
*)msg
, cmsg
)) {
5124 if (!CMSG_OK(msg
, cmsg
))
5127 /* Should we parse this header or ignore? */
5128 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
5131 /* Strictly check lengths following example in SCM code. */
5132 switch (cmsg
->cmsg_type
) {
5134 /* SCTP Socket API Extension
5135 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5137 * This cmsghdr structure provides information for
5138 * initializing new SCTP associations with sendmsg().
5139 * The SCTP_INITMSG socket option uses this same data
5140 * structure. This structure is not used for
5143 * cmsg_level cmsg_type cmsg_data[]
5144 * ------------ ------------ ----------------------
5145 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5147 if (cmsg
->cmsg_len
!=
5148 CMSG_LEN(sizeof(struct sctp_initmsg
)))
5150 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
5154 /* SCTP Socket API Extension
5155 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5157 * This cmsghdr structure specifies SCTP options for
5158 * sendmsg() and describes SCTP header information
5159 * about a received message through recvmsg().
5161 * cmsg_level cmsg_type cmsg_data[]
5162 * ------------ ------------ ----------------------
5163 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5165 if (cmsg
->cmsg_len
!=
5166 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
5170 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
5172 /* Minimally, validate the sinfo_flags. */
5173 if (cmsgs
->info
->sinfo_flags
&
5174 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
5175 SCTP_ABORT
| SCTP_EOF
))
5187 * Wait for a packet..
5188 * Note: This function is the same function as in core/datagram.c
5189 * with a few modifications to make lksctp work.
5191 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
5196 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5198 /* Socket errors? */
5199 error
= sock_error(sk
);
5203 if (!skb_queue_empty(&sk
->sk_receive_queue
))
5206 /* Socket shut down? */
5207 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5210 /* Sequenced packets can come disconnected. If so we report the
5215 /* Is there a good reason to think that we may receive some data? */
5216 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
5219 /* Handle signals. */
5220 if (signal_pending(current
))
5223 /* Let another process have a go. Since we are going to sleep
5224 * anyway. Note: This may cause odd behaviors if the message
5225 * does not fit in the user's buffer, but this seems to be the
5226 * only way to honor MSG_DONTWAIT realistically.
5228 sctp_release_sock(sk
);
5229 *timeo_p
= schedule_timeout(*timeo_p
);
5233 finish_wait(sk
->sk_sleep
, &wait
);
5237 error
= sock_intr_errno(*timeo_p
);
5240 finish_wait(sk
->sk_sleep
, &wait
);
5245 /* Receive a datagram.
5246 * Note: This is pretty much the same routine as in core/datagram.c
5247 * with a few changes to make lksctp work.
5249 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
5250 int noblock
, int *err
)
5253 struct sk_buff
*skb
;
5256 timeo
= sock_rcvtimeo(sk
, noblock
);
5258 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
5259 timeo
, MAX_SCHEDULE_TIMEOUT
);
5262 /* Again only user level code calls this function,
5263 * so nothing interrupt level
5264 * will suddenly eat the receive_queue.
5266 * Look at current nfs client by the way...
5267 * However, this function was corrent in any case. 8)
5269 if (flags
& MSG_PEEK
) {
5270 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
5271 skb
= skb_peek(&sk
->sk_receive_queue
);
5273 atomic_inc(&skb
->users
);
5274 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
5276 skb
= skb_dequeue(&sk
->sk_receive_queue
);
5282 /* Caller is allowed not to check sk->sk_err before calling. */
5283 error
= sock_error(sk
);
5287 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5290 /* User doesn't want to wait. */
5294 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
5303 /* If sndbuf has changed, wake up per association sndbuf waiters. */
5304 static void __sctp_write_space(struct sctp_association
*asoc
)
5306 struct sock
*sk
= asoc
->base
.sk
;
5307 struct socket
*sock
= sk
->sk_socket
;
5309 if ((sctp_wspace(asoc
) > 0) && sock
) {
5310 if (waitqueue_active(&asoc
->wait
))
5311 wake_up_interruptible(&asoc
->wait
);
5313 if (sctp_writeable(sk
)) {
5314 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
5315 wake_up_interruptible(sk
->sk_sleep
);
5317 /* Note that we try to include the Async I/O support
5318 * here by modeling from the current TCP/UDP code.
5319 * We have not tested with it yet.
5321 if (sock
->fasync_list
&&
5322 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
5323 sock_wake_async(sock
, 2, POLL_OUT
);
5328 /* Do accounting for the sndbuf space.
5329 * Decrement the used sndbuf space of the corresponding association by the
5330 * data size which was just transmitted(freed).
5332 static void sctp_wfree(struct sk_buff
*skb
)
5334 struct sctp_association
*asoc
;
5335 struct sctp_chunk
*chunk
;
5338 /* Get the saved chunk pointer. */
5339 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
5342 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
5343 sizeof(struct sk_buff
) +
5344 sizeof(struct sctp_chunk
);
5346 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
5349 __sctp_write_space(asoc
);
5351 sctp_association_put(asoc
);
5354 /* Helper function to wait for space in the sndbuf. */
5355 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
5358 struct sock
*sk
= asoc
->base
.sk
;
5360 long current_timeo
= *timeo_p
;
5363 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
5364 asoc
, (long)(*timeo_p
), msg_len
);
5366 /* Increment the association's refcnt. */
5367 sctp_association_hold(asoc
);
5369 /* Wait on the association specific sndbuf space. */
5371 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
5372 TASK_INTERRUPTIBLE
);
5375 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
5378 if (signal_pending(current
))
5379 goto do_interrupted
;
5380 if (msg_len
<= sctp_wspace(asoc
))
5383 /* Let another process have a go. Since we are going
5386 sctp_release_sock(sk
);
5387 current_timeo
= schedule_timeout(current_timeo
);
5388 BUG_ON(sk
!= asoc
->base
.sk
);
5391 *timeo_p
= current_timeo
;
5395 finish_wait(&asoc
->wait
, &wait
);
5397 /* Release the association's refcnt. */
5398 sctp_association_put(asoc
);
5407 err
= sock_intr_errno(*timeo_p
);
5415 /* If socket sndbuf has changed, wake up all per association waiters. */
5416 void sctp_write_space(struct sock
*sk
)
5418 struct sctp_association
*asoc
;
5419 struct list_head
*pos
;
5421 /* Wake up the tasks in each wait queue. */
5422 list_for_each(pos
, &((sctp_sk(sk
))->ep
->asocs
)) {
5423 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
5424 __sctp_write_space(asoc
);
5428 /* Is there any sndbuf space available on the socket?
5430 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
5431 * associations on the same socket. For a UDP-style socket with
5432 * multiple associations, it is possible for it to be "unwriteable"
5433 * prematurely. I assume that this is acceptable because
5434 * a premature "unwriteable" is better than an accidental "writeable" which
5435 * would cause an unwanted block under certain circumstances. For the 1-1
5436 * UDP-style sockets or TCP-style sockets, this code should work.
5439 static int sctp_writeable(struct sock
*sk
)
5443 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
5449 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
5450 * returns immediately with EINPROGRESS.
5452 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
5454 struct sock
*sk
= asoc
->base
.sk
;
5456 long current_timeo
= *timeo_p
;
5459 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __FUNCTION__
, asoc
,
5462 /* Increment the association's refcnt. */
5463 sctp_association_hold(asoc
);
5466 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
5467 TASK_INTERRUPTIBLE
);
5470 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5472 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
5475 if (signal_pending(current
))
5476 goto do_interrupted
;
5478 if (sctp_state(asoc
, ESTABLISHED
))
5481 /* Let another process have a go. Since we are going
5484 sctp_release_sock(sk
);
5485 current_timeo
= schedule_timeout(current_timeo
);
5488 *timeo_p
= current_timeo
;
5492 finish_wait(&asoc
->wait
, &wait
);
5494 /* Release the association's refcnt. */
5495 sctp_association_put(asoc
);
5500 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
5503 err
= -ECONNREFUSED
;
5507 err
= sock_intr_errno(*timeo_p
);
5515 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
5517 struct sctp_endpoint
*ep
;
5521 ep
= sctp_sk(sk
)->ep
;
5525 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
,
5526 TASK_INTERRUPTIBLE
);
5528 if (list_empty(&ep
->asocs
)) {
5529 sctp_release_sock(sk
);
5530 timeo
= schedule_timeout(timeo
);
5535 if (!sctp_sstate(sk
, LISTENING
))
5539 if (!list_empty(&ep
->asocs
))
5542 err
= sock_intr_errno(timeo
);
5543 if (signal_pending(current
))
5551 finish_wait(sk
->sk_sleep
, &wait
);
5556 void sctp_wait_for_close(struct sock
*sk
, long timeout
)
5561 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5562 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
5564 sctp_release_sock(sk
);
5565 timeout
= schedule_timeout(timeout
);
5567 } while (!signal_pending(current
) && timeout
);
5569 finish_wait(sk
->sk_sleep
, &wait
);
5572 /* Populate the fields of the newsk from the oldsk and migrate the assoc
5573 * and its messages to the newsk.
5575 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
5576 struct sctp_association
*assoc
,
5577 sctp_socket_type_t type
)
5579 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
5580 struct sctp_sock
*newsp
= sctp_sk(newsk
);
5581 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5582 struct sctp_endpoint
*newep
= newsp
->ep
;
5583 struct sk_buff
*skb
, *tmp
;
5584 struct sctp_ulpevent
*event
;
5587 /* Migrate socket buffer sizes and all the socket level options to the
5590 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
5591 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
5592 /* Brute force copy old sctp opt. */
5593 inet_sk_copy_descendant(newsk
, oldsk
);
5595 /* Restore the ep value that was overwritten with the above structure
5601 /* Hook this new socket in to the bind_hash list. */
5602 pp
= sctp_sk(oldsk
)->bind_hash
;
5603 sk_add_bind_node(newsk
, &pp
->owner
);
5604 sctp_sk(newsk
)->bind_hash
= pp
;
5605 inet_sk(newsk
)->num
= inet_sk(oldsk
)->num
;
5607 /* Copy the bind_addr list from the original endpoint to the new
5608 * endpoint so that we can handle restarts properly
5610 if (assoc
->peer
.ipv4_address
)
5611 flags
|= SCTP_ADDR4_PEERSUPP
;
5612 if (assoc
->peer
.ipv6_address
)
5613 flags
|= SCTP_ADDR6_PEERSUPP
;
5614 sctp_bind_addr_copy(&newsp
->ep
->base
.bind_addr
,
5615 &oldsp
->ep
->base
.bind_addr
,
5616 SCTP_SCOPE_GLOBAL
, GFP_KERNEL
, flags
);
5618 /* Move any messages in the old socket's receive queue that are for the
5619 * peeled off association to the new socket's receive queue.
5621 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
5622 event
= sctp_skb2event(skb
);
5623 if (event
->asoc
== assoc
) {
5625 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
5626 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
5627 skb_set_owner_r(skb
, newsk
);
5631 /* Clean up any messages pending delivery due to partial
5632 * delivery. Three cases:
5633 * 1) No partial deliver; no work.
5634 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
5635 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
5637 skb_queue_head_init(&newsp
->pd_lobby
);
5638 sctp_sk(newsk
)->pd_mode
= assoc
->ulpq
.pd_mode
;
5640 if (sctp_sk(oldsk
)->pd_mode
) {
5641 struct sk_buff_head
*queue
;
5643 /* Decide which queue to move pd_lobby skbs to. */
5644 if (assoc
->ulpq
.pd_mode
) {
5645 queue
= &newsp
->pd_lobby
;
5647 queue
= &newsk
->sk_receive_queue
;
5649 /* Walk through the pd_lobby, looking for skbs that
5650 * need moved to the new socket.
5652 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
5653 event
= sctp_skb2event(skb
);
5654 if (event
->asoc
== assoc
) {
5656 __skb_unlink(skb
, &oldsp
->pd_lobby
);
5657 __skb_queue_tail(queue
, skb
);
5658 skb_set_owner_r(skb
, newsk
);
5662 /* Clear up any skbs waiting for the partial
5663 * delivery to finish.
5665 if (assoc
->ulpq
.pd_mode
)
5666 sctp_clear_pd(oldsk
);
5670 /* Set the type of socket to indicate that it is peeled off from the
5671 * original UDP-style socket or created with the accept() call on a
5672 * TCP-style socket..
5676 /* Mark the new socket "in-use" by the user so that any packets
5677 * that may arrive on the association after we've moved it are
5678 * queued to the backlog. This prevents a potential race between
5679 * backlog processing on the old socket and new-packet processing
5680 * on the new socket.
5682 sctp_lock_sock(newsk
);
5683 sctp_assoc_migrate(assoc
, newsk
);
5685 /* If the association on the newsk is already closed before accept()
5686 * is called, set RCV_SHUTDOWN flag.
5688 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
5689 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
5691 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
5692 sctp_release_sock(newsk
);
5695 /* This proto struct describes the ULP interface for SCTP. */
5696 struct proto sctp_prot
= {
5698 .owner
= THIS_MODULE
,
5699 .close
= sctp_close
,
5700 .connect
= sctp_connect
,
5701 .disconnect
= sctp_disconnect
,
5702 .accept
= sctp_accept
,
5703 .ioctl
= sctp_ioctl
,
5704 .init
= sctp_init_sock
,
5705 .destroy
= sctp_destroy_sock
,
5706 .shutdown
= sctp_shutdown
,
5707 .setsockopt
= sctp_setsockopt
,
5708 .getsockopt
= sctp_getsockopt
,
5709 .sendmsg
= sctp_sendmsg
,
5710 .recvmsg
= sctp_recvmsg
,
5712 .backlog_rcv
= sctp_backlog_rcv
,
5714 .unhash
= sctp_unhash
,
5715 .get_port
= sctp_get_port
,
5716 .obj_size
= sizeof(struct sctp_sock
),
5719 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5720 struct proto sctpv6_prot
= {
5722 .owner
= THIS_MODULE
,
5723 .close
= sctp_close
,
5724 .connect
= sctp_connect
,
5725 .disconnect
= sctp_disconnect
,
5726 .accept
= sctp_accept
,
5727 .ioctl
= sctp_ioctl
,
5728 .init
= sctp_init_sock
,
5729 .destroy
= sctp_destroy_sock
,
5730 .shutdown
= sctp_shutdown
,
5731 .setsockopt
= sctp_setsockopt
,
5732 .getsockopt
= sctp_getsockopt
,
5733 .sendmsg
= sctp_sendmsg
,
5734 .recvmsg
= sctp_recvmsg
,
5736 .backlog_rcv
= sctp_backlog_rcv
,
5738 .unhash
= sctp_unhash
,
5739 .get_port
= sctp_get_port
,
5740 .obj_size
= sizeof(struct sctp6_sock
),
5742 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */