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 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
239 id_asoc
= sctp_id2assoc(sk
, id
);
240 if (id_asoc
&& (id_asoc
!= addr_asoc
))
243 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
244 (union sctp_addr
*)addr
);
249 /* API 3.1.2 bind() - UDP Style Syntax
250 * The syntax of bind() is,
252 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
254 * sd - the socket descriptor returned by socket().
255 * addr - the address structure (struct sockaddr_in or struct
256 * sockaddr_in6 [RFC 2553]),
257 * addr_len - the size of the address structure.
259 SCTP_STATIC
int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
265 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
268 /* Disallow binding twice. */
269 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
270 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
275 sctp_release_sock(sk
);
280 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
282 /* Verify this is a valid sockaddr. */
283 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
284 union sctp_addr
*addr
, int len
)
288 /* Check minimum size. */
289 if (len
< sizeof (struct sockaddr
))
292 /* Does this PF support this AF? */
293 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
296 /* If we get this far, af is valid. */
297 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
299 if (len
< af
->sockaddr_len
)
305 /* Bind a local address either to an endpoint or to an association. */
306 SCTP_STATIC
int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
308 struct sctp_sock
*sp
= sctp_sk(sk
);
309 struct sctp_endpoint
*ep
= sp
->ep
;
310 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
315 /* Common sockaddr verification. */
316 af
= sctp_sockaddr_af(sp
, addr
, len
);
318 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
323 snum
= ntohs(addr
->v4
.sin_port
);
325 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
326 ", port: %d, new port: %d, len: %d)\n",
332 /* PF specific bind() address verification. */
333 if (!sp
->pf
->bind_verify(sp
, addr
))
334 return -EADDRNOTAVAIL
;
336 /* We must either be unbound, or bind to the same port. */
337 if (bp
->port
&& (snum
!= bp
->port
)) {
338 SCTP_DEBUG_PRINTK("sctp_do_bind:"
339 " New port %d does not match existing port "
340 "%d.\n", snum
, bp
->port
);
344 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
347 /* Make sure we are allowed to bind here.
348 * The function sctp_get_port_local() does duplicate address
351 if ((ret
= sctp_get_port_local(sk
, addr
))) {
352 if (ret
== (long) sk
) {
353 /* This endpoint has a conflicting address. */
360 /* Refresh ephemeral port. */
362 bp
->port
= inet_sk(sk
)->num
;
364 /* Add the address to the bind address list. */
365 sctp_local_bh_disable();
366 sctp_write_lock(&ep
->base
.addr_lock
);
368 /* Use GFP_ATOMIC since BHs are disabled. */
369 ret
= sctp_add_bind_addr(bp
, addr
, 1, GFP_ATOMIC
);
370 sctp_write_unlock(&ep
->base
.addr_lock
);
371 sctp_local_bh_enable();
373 /* Copy back into socket for getsockname() use. */
375 inet_sk(sk
)->sport
= htons(inet_sk(sk
)->num
);
376 af
->to_sk_saddr(addr
, sk
);
382 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
384 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
385 * at any one time. If a sender, after sending an ASCONF chunk, decides
386 * it needs to transfer another ASCONF Chunk, it MUST wait until the
387 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
388 * subsequent ASCONF. Note this restriction binds each side, so at any
389 * time two ASCONF may be in-transit on any given association (one sent
390 * from each endpoint).
392 static int sctp_send_asconf(struct sctp_association
*asoc
,
393 struct sctp_chunk
*chunk
)
397 /* If there is an outstanding ASCONF chunk, queue it for later
400 if (asoc
->addip_last_asconf
) {
401 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
405 /* Hold the chunk until an ASCONF_ACK is received. */
406 sctp_chunk_hold(chunk
);
407 retval
= sctp_primitive_ASCONF(asoc
, chunk
);
409 sctp_chunk_free(chunk
);
411 asoc
->addip_last_asconf
= chunk
;
417 /* Add a list of addresses as bind addresses to local endpoint or
420 * Basically run through each address specified in the addrs/addrcnt
421 * array/length pair, determine if it is IPv6 or IPv4 and call
422 * sctp_do_bind() on it.
424 * If any of them fails, then the operation will be reversed and the
425 * ones that were added will be removed.
427 * Only sctp_setsockopt_bindx() is supposed to call this function.
429 int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
434 struct sockaddr
*sa_addr
;
437 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
441 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
442 /* The list may contain either IPv4 or IPv6 address;
443 * determine the address length for walking thru the list.
445 sa_addr
= (struct sockaddr
*)addr_buf
;
446 af
= sctp_get_af_specific(sa_addr
->sa_family
);
452 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
455 addr_buf
+= af
->sockaddr_len
;
459 /* Failed. Cleanup the ones that have been added */
461 sctp_bindx_rem(sk
, addrs
, cnt
);
469 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
470 * associations that are part of the endpoint indicating that a list of local
471 * addresses are added to the endpoint.
473 * If any of the addresses is already in the bind address list of the
474 * association, we do not send the chunk for that association. But it will not
475 * affect other associations.
477 * Only sctp_setsockopt_bindx() is supposed to call this function.
479 static int sctp_send_asconf_add_ip(struct sock
*sk
,
480 struct sockaddr
*addrs
,
483 struct sctp_sock
*sp
;
484 struct sctp_endpoint
*ep
;
485 struct sctp_association
*asoc
;
486 struct sctp_bind_addr
*bp
;
487 struct sctp_chunk
*chunk
;
488 struct sctp_sockaddr_entry
*laddr
;
489 union sctp_addr
*addr
;
490 union sctp_addr saveaddr
;
493 struct list_head
*pos
;
498 if (!sctp_addip_enable
)
504 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
505 __FUNCTION__
, sk
, addrs
, addrcnt
);
507 list_for_each(pos
, &ep
->asocs
) {
508 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
510 if (!asoc
->peer
.asconf_capable
)
513 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
516 if (!sctp_state(asoc
, ESTABLISHED
))
519 /* Check if any address in the packed array of addresses is
520 * in the bind address list of the association. If so,
521 * do not send the asconf chunk to its peer, but continue with
522 * other associations.
525 for (i
= 0; i
< addrcnt
; i
++) {
526 addr
= (union sctp_addr
*)addr_buf
;
527 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
533 if (sctp_assoc_lookup_laddr(asoc
, addr
))
536 addr_buf
+= af
->sockaddr_len
;
541 /* Use the first address in bind addr list of association as
542 * Address Parameter of ASCONF CHUNK.
544 sctp_read_lock(&asoc
->base
.addr_lock
);
545 bp
= &asoc
->base
.bind_addr
;
546 p
= bp
->address_list
.next
;
547 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
548 sctp_read_unlock(&asoc
->base
.addr_lock
);
550 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a_h
, addrs
,
551 addrcnt
, SCTP_PARAM_ADD_IP
);
557 retval
= sctp_send_asconf(asoc
, chunk
);
561 /* Add the new addresses to the bind address list with
562 * use_as_src set to 0.
564 sctp_local_bh_disable();
565 sctp_write_lock(&asoc
->base
.addr_lock
);
567 for (i
= 0; i
< addrcnt
; i
++) {
568 addr
= (union sctp_addr
*)addr_buf
;
569 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
570 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
571 retval
= sctp_add_bind_addr(bp
, &saveaddr
, 0,
573 addr_buf
+= af
->sockaddr_len
;
575 sctp_write_unlock(&asoc
->base
.addr_lock
);
576 sctp_local_bh_enable();
583 /* Remove a list of addresses from bind addresses list. Do not remove the
586 * Basically run through each address specified in the addrs/addrcnt
587 * array/length pair, determine if it is IPv6 or IPv4 and call
588 * sctp_del_bind() on it.
590 * If any of them fails, then the operation will be reversed and the
591 * ones that were removed will be added back.
593 * At least one address has to be left; if only one address is
594 * available, the operation will return -EBUSY.
596 * Only sctp_setsockopt_bindx() is supposed to call this function.
598 int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
600 struct sctp_sock
*sp
= sctp_sk(sk
);
601 struct sctp_endpoint
*ep
= sp
->ep
;
603 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
606 union sctp_addr
*sa_addr
;
609 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
613 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
614 /* If the bind address list is empty or if there is only one
615 * bind address, there is nothing more to be removed (we need
616 * at least one address here).
618 if (list_empty(&bp
->address_list
) ||
619 (sctp_list_single_entry(&bp
->address_list
))) {
624 sa_addr
= (union sctp_addr
*)addr_buf
;
625 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
630 if (sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
635 /* FIXME - There is probably a need to check if sk->sk_saddr and
636 * sk->sk_rcv_addr are currently set to one of the addresses to
637 * be removed. This is something which needs to be looked into
638 * when we are fixing the outstanding issues with multi-homing
639 * socket routing and failover schemes. Refer to comments in
640 * sctp_do_bind(). -daisy
642 sctp_local_bh_disable();
643 sctp_write_lock(&ep
->base
.addr_lock
);
645 retval
= sctp_del_bind_addr(bp
, sa_addr
);
647 sctp_write_unlock(&ep
->base
.addr_lock
);
648 sctp_local_bh_enable();
650 addr_buf
+= af
->sockaddr_len
;
653 /* Failed. Add the ones that has been removed back */
655 sctp_bindx_add(sk
, addrs
, cnt
);
663 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
664 * the associations that are part of the endpoint indicating that a list of
665 * local addresses are removed from the endpoint.
667 * If any of the addresses is already in the bind address list of the
668 * association, we do not send the chunk for that association. But it will not
669 * affect other associations.
671 * Only sctp_setsockopt_bindx() is supposed to call this function.
673 static int sctp_send_asconf_del_ip(struct sock
*sk
,
674 struct sockaddr
*addrs
,
677 struct sctp_sock
*sp
;
678 struct sctp_endpoint
*ep
;
679 struct sctp_association
*asoc
;
680 struct sctp_transport
*transport
;
681 struct sctp_bind_addr
*bp
;
682 struct sctp_chunk
*chunk
;
683 union sctp_addr
*laddr
;
686 struct list_head
*pos
, *pos1
;
687 struct sctp_sockaddr_entry
*saddr
;
691 if (!sctp_addip_enable
)
697 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
698 __FUNCTION__
, sk
, addrs
, addrcnt
);
700 list_for_each(pos
, &ep
->asocs
) {
701 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
703 if (!asoc
->peer
.asconf_capable
)
706 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
709 if (!sctp_state(asoc
, ESTABLISHED
))
712 /* Check if any address in the packed array of addresses is
713 * not present in the bind address list of the association.
714 * If so, do not send the asconf chunk to its peer, but
715 * continue with other associations.
718 for (i
= 0; i
< addrcnt
; i
++) {
719 laddr
= (union sctp_addr
*)addr_buf
;
720 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
726 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
729 addr_buf
+= af
->sockaddr_len
;
734 /* Find one address in the association's bind address list
735 * that is not in the packed array of addresses. This is to
736 * make sure that we do not delete all the addresses in the
739 sctp_read_lock(&asoc
->base
.addr_lock
);
740 bp
= &asoc
->base
.bind_addr
;
741 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
743 sctp_read_unlock(&asoc
->base
.addr_lock
);
747 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
754 /* Reset use_as_src flag for the addresses in the bind address
755 * list that are to be deleted.
757 sctp_local_bh_disable();
758 sctp_write_lock(&asoc
->base
.addr_lock
);
760 for (i
= 0; i
< addrcnt
; i
++) {
761 laddr
= (union sctp_addr
*)addr_buf
;
762 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
763 list_for_each(pos1
, &bp
->address_list
) {
764 saddr
= list_entry(pos1
,
765 struct sctp_sockaddr_entry
,
767 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
768 saddr
->use_as_src
= 0;
770 addr_buf
+= af
->sockaddr_len
;
772 sctp_write_unlock(&asoc
->base
.addr_lock
);
773 sctp_local_bh_enable();
775 /* Update the route and saddr entries for all the transports
776 * as some of the addresses in the bind address list are
777 * about to be deleted and cannot be used as source addresses.
779 list_for_each(pos1
, &asoc
->peer
.transport_addr_list
) {
780 transport
= list_entry(pos1
, struct sctp_transport
,
782 dst_release(transport
->dst
);
783 sctp_transport_route(transport
, NULL
,
784 sctp_sk(asoc
->base
.sk
));
787 retval
= sctp_send_asconf(asoc
, chunk
);
793 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
796 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
799 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
800 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
803 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
804 * Section 3.1.2 for this usage.
806 * addrs is a pointer to an array of one or more socket addresses. Each
807 * address is contained in its appropriate structure (i.e. struct
808 * sockaddr_in or struct sockaddr_in6) the family of the address type
809 * must be used to distinguish the address length (note that this
810 * representation is termed a "packed array" of addresses). The caller
811 * specifies the number of addresses in the array with addrcnt.
813 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
814 * -1, and sets errno to the appropriate error code.
816 * For SCTP, the port given in each socket address must be the same, or
817 * sctp_bindx() will fail, setting errno to EINVAL.
819 * The flags parameter is formed from the bitwise OR of zero or more of
820 * the following currently defined flags:
822 * SCTP_BINDX_ADD_ADDR
824 * SCTP_BINDX_REM_ADDR
826 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
827 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
828 * addresses from the association. The two flags are mutually exclusive;
829 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
830 * not remove all addresses from an association; sctp_bindx() will
831 * reject such an attempt with EINVAL.
833 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
834 * additional addresses with an endpoint after calling bind(). Or use
835 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
836 * socket is associated with so that no new association accepted will be
837 * associated with those addresses. If the endpoint supports dynamic
838 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
839 * endpoint to send the appropriate message to the peer to change the
840 * peers address lists.
842 * Adding and removing addresses from a connected association is
843 * optional functionality. Implementations that do not support this
844 * functionality should return EOPNOTSUPP.
846 * Basically do nothing but copying the addresses from user to kernel
847 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
848 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
851 * We don't use copy_from_user() for optimization: we first do the
852 * sanity checks (buffer size -fast- and access check-healthy
853 * pointer); if all of those succeed, then we can alloc the memory
854 * (expensive operation) needed to copy the data to kernel. Then we do
855 * the copying without checking the user space area
856 * (__copy_from_user()).
858 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
861 * sk The sk of the socket
862 * addrs The pointer to the addresses in user land
863 * addrssize Size of the addrs buffer
864 * op Operation to perform (add or remove, see the flags of
867 * Returns 0 if ok, <0 errno code on error.
869 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
870 struct sockaddr __user
*addrs
,
871 int addrs_size
, int op
)
873 struct sockaddr
*kaddrs
;
877 struct sockaddr
*sa_addr
;
881 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
882 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
884 if (unlikely(addrs_size
<= 0))
887 /* Check the user passed a healthy pointer. */
888 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
891 /* Alloc space for the address array in kernel memory. */
892 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
893 if (unlikely(!kaddrs
))
896 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
901 /* Walk through the addrs buffer and count the number of addresses. */
903 while (walk_size
< addrs_size
) {
904 sa_addr
= (struct sockaddr
*)addr_buf
;
905 af
= sctp_get_af_specific(sa_addr
->sa_family
);
907 /* If the address family is not supported or if this address
908 * causes the address buffer to overflow return EINVAL.
910 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
915 addr_buf
+= af
->sockaddr_len
;
916 walk_size
+= af
->sockaddr_len
;
921 case SCTP_BINDX_ADD_ADDR
:
922 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
925 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
928 case SCTP_BINDX_REM_ADDR
:
929 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
932 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
946 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
948 * Common routine for handling connect() and sctp_connectx().
949 * Connect will come in with just a single address.
951 static int __sctp_connect(struct sock
* sk
,
952 struct sockaddr
*kaddrs
,
955 struct sctp_sock
*sp
;
956 struct sctp_endpoint
*ep
;
957 struct sctp_association
*asoc
= NULL
;
958 struct sctp_association
*asoc2
;
959 struct sctp_transport
*transport
;
967 union sctp_addr
*sa_addr
;
973 /* connect() cannot be done on a socket that is already in ESTABLISHED
974 * state - UDP-style peeled off socket or a TCP-style socket that
975 * is already connected.
976 * It cannot be done even on a TCP-style listening socket.
978 if (sctp_sstate(sk
, ESTABLISHED
) ||
979 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
984 /* Walk through the addrs buffer and count the number of addresses. */
986 while (walk_size
< addrs_size
) {
987 sa_addr
= (union sctp_addr
*)addr_buf
;
988 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
990 /* If the address family is not supported or if this address
991 * causes the address buffer to overflow return EINVAL.
993 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
998 err
= sctp_verify_addr(sk
, sa_addr
, af
->sockaddr_len
);
1002 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1003 to
.v4
.sin_port
= ntohs(to
.v4
.sin_port
);
1005 /* Check if there already is a matching association on the
1006 * endpoint (other than the one created here).
1008 asoc2
= sctp_endpoint_lookup_assoc(ep
, sa_addr
, &transport
);
1009 if (asoc2
&& asoc2
!= asoc
) {
1010 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1017 /* If we could not find a matching association on the endpoint,
1018 * make sure that there is no peeled-off association matching
1019 * the peer address even on another socket.
1021 if (sctp_endpoint_is_peeled_off(ep
, sa_addr
)) {
1022 err
= -EADDRNOTAVAIL
;
1027 /* If a bind() or sctp_bindx() is not called prior to
1028 * an sctp_connectx() call, the system picks an
1029 * ephemeral port and will choose an address set
1030 * equivalent to binding with a wildcard address.
1032 if (!ep
->base
.bind_addr
.port
) {
1033 if (sctp_autobind(sk
)) {
1039 * If an unprivileged user inherits a 1-many
1040 * style socket with open associations on a
1041 * privileged port, it MAY be permitted to
1042 * accept new associations, but it SHOULD NOT
1043 * be permitted to open new associations.
1045 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1046 !capable(CAP_NET_BIND_SERVICE
)) {
1052 scope
= sctp_scope(&to
);
1053 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1060 /* Prime the peer's transport structures. */
1061 transport
= sctp_assoc_add_peer(asoc
, sa_addr
, GFP_KERNEL
,
1069 addr_buf
+= af
->sockaddr_len
;
1070 walk_size
+= af
->sockaddr_len
;
1073 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1078 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1083 /* Initialize sk's dport and daddr for getpeername() */
1084 inet_sk(sk
)->dport
= htons(asoc
->peer
.port
);
1085 af
= sctp_get_af_specific(to
.sa
.sa_family
);
1086 af
->to_sk_daddr(&to
, sk
);
1089 timeo
= sock_sndtimeo(sk
, sk
->sk_socket
->file
->f_flags
& O_NONBLOCK
);
1090 err
= sctp_wait_for_connect(asoc
, &timeo
);
1092 /* Don't free association on exit. */
1097 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1098 " kaddrs: %p err: %d\n",
1101 sctp_association_free(asoc
);
1105 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1108 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
1110 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1111 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1112 * or IPv6 addresses.
1114 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1115 * Section 3.1.2 for this usage.
1117 * addrs is a pointer to an array of one or more socket addresses. Each
1118 * address is contained in its appropriate structure (i.e. struct
1119 * sockaddr_in or struct sockaddr_in6) the family of the address type
1120 * must be used to distengish the address length (note that this
1121 * representation is termed a "packed array" of addresses). The caller
1122 * specifies the number of addresses in the array with addrcnt.
1124 * On success, sctp_connectx() returns 0. On failure, sctp_connectx() returns
1125 * -1, and sets errno to the appropriate error code.
1127 * For SCTP, the port given in each socket address must be the same, or
1128 * sctp_connectx() will fail, setting errno to EINVAL.
1130 * An application can use sctp_connectx to initiate an association with
1131 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1132 * allows a caller to specify multiple addresses at which a peer can be
1133 * reached. The way the SCTP stack uses the list of addresses to set up
1134 * the association is implementation dependant. This function only
1135 * specifies that the stack will try to make use of all the addresses in
1136 * the list when needed.
1138 * Note that the list of addresses passed in is only used for setting up
1139 * the association. It does not necessarily equal the set of addresses
1140 * the peer uses for the resulting association. If the caller wants to
1141 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1142 * retrieve them after the association has been set up.
1144 * Basically do nothing but copying the addresses from user to kernel
1145 * land and invoking either sctp_connectx(). This is used for tunneling
1146 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1148 * We don't use copy_from_user() for optimization: we first do the
1149 * sanity checks (buffer size -fast- and access check-healthy
1150 * pointer); if all of those succeed, then we can alloc the memory
1151 * (expensive operation) needed to copy the data to kernel. Then we do
1152 * the copying without checking the user space area
1153 * (__copy_from_user()).
1155 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1158 * sk The sk of the socket
1159 * addrs The pointer to the addresses in user land
1160 * addrssize Size of the addrs buffer
1162 * Returns 0 if ok, <0 errno code on error.
1164 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1165 struct sockaddr __user
*addrs
,
1169 struct sockaddr
*kaddrs
;
1171 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1172 __FUNCTION__
, sk
, addrs
, addrs_size
);
1174 if (unlikely(addrs_size
<= 0))
1177 /* Check the user passed a healthy pointer. */
1178 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1181 /* Alloc space for the address array in kernel memory. */
1182 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1183 if (unlikely(!kaddrs
))
1186 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1189 err
= __sctp_connect(sk
, kaddrs
, addrs_size
);
1196 /* API 3.1.4 close() - UDP Style Syntax
1197 * Applications use close() to perform graceful shutdown (as described in
1198 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1199 * by a UDP-style socket.
1203 * ret = close(int sd);
1205 * sd - the socket descriptor of the associations to be closed.
1207 * To gracefully shutdown a specific association represented by the
1208 * UDP-style socket, an application should use the sendmsg() call,
1209 * passing no user data, but including the appropriate flag in the
1210 * ancillary data (see Section xxxx).
1212 * If sd in the close() call is a branched-off socket representing only
1213 * one association, the shutdown is performed on that association only.
1215 * 4.1.6 close() - TCP Style Syntax
1217 * Applications use close() to gracefully close down an association.
1221 * int close(int sd);
1223 * sd - the socket descriptor of the association to be closed.
1225 * After an application calls close() on a socket descriptor, no further
1226 * socket operations will succeed on that descriptor.
1228 * API 7.1.4 SO_LINGER
1230 * An application using the TCP-style socket can use this option to
1231 * perform the SCTP ABORT primitive. The linger option structure is:
1234 * int l_onoff; // option on/off
1235 * int l_linger; // linger time
1238 * To enable the option, set l_onoff to 1. If the l_linger value is set
1239 * to 0, calling close() is the same as the ABORT primitive. If the
1240 * value is set to a negative value, the setsockopt() call will return
1241 * an error. If the value is set to a positive value linger_time, the
1242 * close() can be blocked for at most linger_time ms. If the graceful
1243 * shutdown phase does not finish during this period, close() will
1244 * return but the graceful shutdown phase continues in the system.
1246 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1248 struct sctp_endpoint
*ep
;
1249 struct sctp_association
*asoc
;
1250 struct list_head
*pos
, *temp
;
1252 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1255 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1257 ep
= sctp_sk(sk
)->ep
;
1259 /* Walk all associations on an endpoint. */
1260 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1261 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1263 if (sctp_style(sk
, TCP
)) {
1264 /* A closed association can still be in the list if
1265 * it belongs to a TCP-style listening socket that is
1266 * not yet accepted. If so, free it. If not, send an
1267 * ABORT or SHUTDOWN based on the linger options.
1269 if (sctp_state(asoc
, CLOSED
)) {
1270 sctp_unhash_established(asoc
);
1271 sctp_association_free(asoc
);
1276 if (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
) {
1277 struct sctp_chunk
*chunk
;
1279 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1281 sctp_primitive_ABORT(asoc
, chunk
);
1283 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1286 /* Clean up any skbs sitting on the receive queue. */
1287 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1288 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1290 /* On a TCP-style socket, block for at most linger_time if set. */
1291 if (sctp_style(sk
, TCP
) && timeout
)
1292 sctp_wait_for_close(sk
, timeout
);
1294 /* This will run the backlog queue. */
1295 sctp_release_sock(sk
);
1297 /* Supposedly, no process has access to the socket, but
1298 * the net layers still may.
1300 sctp_local_bh_disable();
1301 sctp_bh_lock_sock(sk
);
1303 /* Hold the sock, since sk_common_release() will put sock_put()
1304 * and we have just a little more cleanup.
1307 sk_common_release(sk
);
1309 sctp_bh_unlock_sock(sk
);
1310 sctp_local_bh_enable();
1314 SCTP_DBG_OBJCNT_DEC(sock
);
1317 /* Handle EPIPE error. */
1318 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1321 err
= sock_error(sk
) ? : -EPIPE
;
1322 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1323 send_sig(SIGPIPE
, current
, 0);
1327 /* API 3.1.3 sendmsg() - UDP Style Syntax
1329 * An application uses sendmsg() and recvmsg() calls to transmit data to
1330 * and receive data from its peer.
1332 * ssize_t sendmsg(int socket, const struct msghdr *message,
1335 * socket - the socket descriptor of the endpoint.
1336 * message - pointer to the msghdr structure which contains a single
1337 * user message and possibly some ancillary data.
1339 * See Section 5 for complete description of the data
1342 * flags - flags sent or received with the user message, see Section
1343 * 5 for complete description of the flags.
1345 * Note: This function could use a rewrite especially when explicit
1346 * connect support comes in.
1348 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1350 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1352 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1353 struct msghdr
*msg
, size_t msg_len
)
1355 struct sctp_sock
*sp
;
1356 struct sctp_endpoint
*ep
;
1357 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1358 struct sctp_transport
*transport
, *chunk_tp
;
1359 struct sctp_chunk
*chunk
;
1360 union sctp_addr to
, tmp
;
1361 struct sockaddr
*msg_name
= NULL
;
1362 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1363 struct sctp_sndrcvinfo
*sinfo
;
1364 struct sctp_initmsg
*sinit
;
1365 sctp_assoc_t associd
= 0;
1366 sctp_cmsgs_t cmsgs
= { NULL
};
1370 __u16 sinfo_flags
= 0;
1371 struct sctp_datamsg
*datamsg
;
1372 struct list_head
*pos
;
1373 int msg_flags
= msg
->msg_flags
;
1375 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1382 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1384 /* We cannot send a message over a TCP-style listening socket. */
1385 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1390 /* Parse out the SCTP CMSGs. */
1391 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1394 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1398 /* Fetch the destination address for this packet. This
1399 * address only selects the association--it is not necessarily
1400 * the address we will send to.
1401 * For a peeled-off socket, msg_name is ignored.
1403 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1404 int msg_namelen
= msg
->msg_namelen
;
1406 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1411 if (msg_namelen
> sizeof(to
))
1412 msg_namelen
= sizeof(to
);
1413 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1414 memcpy(&tmp
, msg
->msg_name
, msg_namelen
);
1415 SCTP_DEBUG_PRINTK("Just memcpy'd. msg_name is "
1417 to
.v4
.sin_addr
.s_addr
, to
.v4
.sin_port
);
1419 to
.v4
.sin_port
= ntohs(to
.v4
.sin_port
);
1420 msg_name
= msg
->msg_name
;
1426 /* Did the user specify SNDRCVINFO? */
1428 sinfo_flags
= sinfo
->sinfo_flags
;
1429 associd
= sinfo
->sinfo_assoc_id
;
1432 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1433 msg_len
, sinfo_flags
);
1435 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1436 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1441 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1442 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1443 * If SCTP_ABORT is set, the message length could be non zero with
1444 * the msg_iov set to the user abort reason.
1446 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1447 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1452 /* If SCTP_ADDR_OVER is set, there must be an address
1453 * specified in msg_name.
1455 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1462 SCTP_DEBUG_PRINTK("About to look up association.\n");
1466 /* If a msg_name has been specified, assume this is to be used. */
1468 /* Look for a matching association on the endpoint. */
1469 asoc
= sctp_endpoint_lookup_assoc(ep
, &tmp
, &transport
);
1471 /* If we could not find a matching association on the
1472 * endpoint, make sure that it is not a TCP-style
1473 * socket that already has an association or there is
1474 * no peeled-off association on another socket.
1476 if ((sctp_style(sk
, TCP
) &&
1477 sctp_sstate(sk
, ESTABLISHED
)) ||
1478 sctp_endpoint_is_peeled_off(ep
, &tmp
)) {
1479 err
= -EADDRNOTAVAIL
;
1484 asoc
= sctp_id2assoc(sk
, associd
);
1492 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1494 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1495 * socket that has an association in CLOSED state. This can
1496 * happen when an accepted socket has an association that is
1499 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1504 if (sinfo_flags
& SCTP_EOF
) {
1505 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1507 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1511 if (sinfo_flags
& SCTP_ABORT
) {
1512 struct sctp_chunk
*chunk
;
1514 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1520 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1521 sctp_primitive_ABORT(asoc
, chunk
);
1527 /* Do we need to create the association? */
1529 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1531 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1536 /* Check for invalid stream against the stream counts,
1537 * either the default or the user specified stream counts.
1540 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1541 /* Check against the defaults. */
1542 if (sinfo
->sinfo_stream
>=
1543 sp
->initmsg
.sinit_num_ostreams
) {
1548 /* Check against the requested. */
1549 if (sinfo
->sinfo_stream
>=
1550 sinit
->sinit_num_ostreams
) {
1558 * API 3.1.2 bind() - UDP Style Syntax
1559 * If a bind() or sctp_bindx() is not called prior to a
1560 * sendmsg() call that initiates a new association, the
1561 * system picks an ephemeral port and will choose an address
1562 * set equivalent to binding with a wildcard address.
1564 if (!ep
->base
.bind_addr
.port
) {
1565 if (sctp_autobind(sk
)) {
1571 * If an unprivileged user inherits a one-to-many
1572 * style socket with open associations on a privileged
1573 * port, it MAY be permitted to accept new associations,
1574 * but it SHOULD NOT be permitted to open new
1577 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1578 !capable(CAP_NET_BIND_SERVICE
)) {
1584 scope
= sctp_scope(&to
);
1585 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1592 /* If the SCTP_INIT ancillary data is specified, set all
1593 * the association init values accordingly.
1596 if (sinit
->sinit_num_ostreams
) {
1597 asoc
->c
.sinit_num_ostreams
=
1598 sinit
->sinit_num_ostreams
;
1600 if (sinit
->sinit_max_instreams
) {
1601 asoc
->c
.sinit_max_instreams
=
1602 sinit
->sinit_max_instreams
;
1604 if (sinit
->sinit_max_attempts
) {
1605 asoc
->max_init_attempts
1606 = sinit
->sinit_max_attempts
;
1608 if (sinit
->sinit_max_init_timeo
) {
1609 asoc
->max_init_timeo
=
1610 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1614 /* Prime the peer's transport structures. */
1615 transport
= sctp_assoc_add_peer(asoc
, &tmp
, GFP_KERNEL
, SCTP_UNKNOWN
);
1620 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1627 /* ASSERT: we have a valid association at this point. */
1628 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1631 /* If the user didn't specify SNDRCVINFO, make up one with
1634 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1635 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1636 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1637 default_sinfo
.sinfo_context
= asoc
->default_context
;
1638 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1639 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1640 sinfo
= &default_sinfo
;
1643 /* API 7.1.7, the sndbuf size per association bounds the
1644 * maximum size of data that can be sent in a single send call.
1646 if (msg_len
> sk
->sk_sndbuf
) {
1651 /* If fragmentation is disabled and the message length exceeds the
1652 * association fragmentation point, return EMSGSIZE. The I-D
1653 * does not specify what this error is, but this looks like
1656 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1662 /* Check for invalid stream. */
1663 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1669 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1670 if (!sctp_wspace(asoc
)) {
1671 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1676 /* If an address is passed with the sendto/sendmsg call, it is used
1677 * to override the primary destination address in the TCP model, or
1678 * when SCTP_ADDR_OVER flag is set in the UDP model.
1680 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1681 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1682 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &tmp
);
1690 /* Auto-connect, if we aren't connected already. */
1691 if (sctp_state(asoc
, CLOSED
)) {
1692 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1695 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1698 /* Break the message into multiple chunks of maximum size. */
1699 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1705 /* Now send the (possibly) fragmented message. */
1706 list_for_each(pos
, &datamsg
->chunks
) {
1707 chunk
= list_entry(pos
, struct sctp_chunk
, frag_list
);
1708 sctp_datamsg_track(chunk
);
1710 /* Do accounting for the write space. */
1711 sctp_set_owner_w(chunk
);
1713 chunk
->transport
= chunk_tp
;
1715 /* Send it to the lower layers. Note: all chunks
1716 * must either fail or succeed. The lower layer
1717 * works that way today. Keep it that way or this
1720 err
= sctp_primitive_SEND(asoc
, chunk
);
1721 /* Did the lower layer accept the chunk? */
1723 sctp_chunk_free(chunk
);
1724 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1727 sctp_datamsg_free(datamsg
);
1733 /* If we are already past ASSOCIATE, the lower
1734 * layers are responsible for association cleanup.
1740 sctp_association_free(asoc
);
1742 sctp_release_sock(sk
);
1745 return sctp_error(sk
, msg_flags
, err
);
1752 err
= sock_error(sk
);
1762 /* This is an extended version of skb_pull() that removes the data from the
1763 * start of a skb even when data is spread across the list of skb's in the
1764 * frag_list. len specifies the total amount of data that needs to be removed.
1765 * when 'len' bytes could be removed from the skb, it returns 0.
1766 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1767 * could not be removed.
1769 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1771 struct sk_buff
*list
;
1772 int skb_len
= skb_headlen(skb
);
1775 if (len
<= skb_len
) {
1776 __skb_pull(skb
, len
);
1780 __skb_pull(skb
, skb_len
);
1782 for (list
= skb_shinfo(skb
)->frag_list
; list
; list
= list
->next
) {
1783 rlen
= sctp_skb_pull(list
, len
);
1784 skb
->len
-= (len
-rlen
);
1785 skb
->data_len
-= (len
-rlen
);
1796 /* API 3.1.3 recvmsg() - UDP Style Syntax
1798 * ssize_t recvmsg(int socket, struct msghdr *message,
1801 * socket - the socket descriptor of the endpoint.
1802 * message - pointer to the msghdr structure which contains a single
1803 * user message and possibly some ancillary data.
1805 * See Section 5 for complete description of the data
1808 * flags - flags sent or received with the user message, see Section
1809 * 5 for complete description of the flags.
1811 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1813 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1814 struct msghdr
*msg
, size_t len
, int noblock
,
1815 int flags
, int *addr_len
)
1817 struct sctp_ulpevent
*event
= NULL
;
1818 struct sctp_sock
*sp
= sctp_sk(sk
);
1819 struct sk_buff
*skb
;
1824 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1825 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1826 "len", len
, "knoblauch", noblock
,
1827 "flags", flags
, "addr_len", addr_len
);
1831 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1836 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1840 /* Get the total length of the skb including any skb's in the
1849 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1851 event
= sctp_skb2event(skb
);
1856 sock_recv_timestamp(msg
, sk
, skb
);
1857 if (sctp_ulpevent_is_notification(event
)) {
1858 msg
->msg_flags
|= MSG_NOTIFICATION
;
1859 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1861 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1864 /* Check if we allow SCTP_SNDRCVINFO. */
1865 if (sp
->subscribe
.sctp_data_io_event
)
1866 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1868 /* FIXME: we should be calling IP/IPv6 layers. */
1869 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1870 ip_cmsg_recv(msg
, skb
);
1875 /* If skb's length exceeds the user's buffer, update the skb and
1876 * push it back to the receive_queue so that the next call to
1877 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1879 if (skb_len
> copied
) {
1880 msg
->msg_flags
&= ~MSG_EOR
;
1881 if (flags
& MSG_PEEK
)
1883 sctp_skb_pull(skb
, copied
);
1884 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1886 /* When only partial message is copied to the user, increase
1887 * rwnd by that amount. If all the data in the skb is read,
1888 * rwnd is updated when the event is freed.
1890 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
1892 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
1893 (event
->msg_flags
& MSG_EOR
))
1894 msg
->msg_flags
|= MSG_EOR
;
1896 msg
->msg_flags
&= ~MSG_EOR
;
1899 if (flags
& MSG_PEEK
) {
1900 /* Release the skb reference acquired after peeking the skb in
1901 * sctp_skb_recv_datagram().
1905 /* Free the event which includes releasing the reference to
1906 * the owner of the skb, freeing the skb and updating the
1909 sctp_ulpevent_free(event
);
1912 sctp_release_sock(sk
);
1916 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1918 * This option is a on/off flag. If enabled no SCTP message
1919 * fragmentation will be performed. Instead if a message being sent
1920 * exceeds the current PMTU size, the message will NOT be sent and
1921 * instead a error will be indicated to the user.
1923 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
1924 char __user
*optval
, int optlen
)
1928 if (optlen
< sizeof(int))
1931 if (get_user(val
, (int __user
*)optval
))
1934 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
1939 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
1942 if (optlen
!= sizeof(struct sctp_event_subscribe
))
1944 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
1949 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
1951 * This socket option is applicable to the UDP-style socket only. When
1952 * set it will cause associations that are idle for more than the
1953 * specified number of seconds to automatically close. An association
1954 * being idle is defined an association that has NOT sent or received
1955 * user data. The special value of '0' indicates that no automatic
1956 * close of any associations should be performed. The option expects an
1957 * integer defining the number of seconds of idle time before an
1958 * association is closed.
1960 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
1963 struct sctp_sock
*sp
= sctp_sk(sk
);
1965 /* Applicable to UDP-style socket only */
1966 if (sctp_style(sk
, TCP
))
1968 if (optlen
!= sizeof(int))
1970 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
1976 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
1978 * Applications can enable or disable heartbeats for any peer address of
1979 * an association, modify an address's heartbeat interval, force a
1980 * heartbeat to be sent immediately, and adjust the address's maximum
1981 * number of retransmissions sent before an address is considered
1982 * unreachable. The following structure is used to access and modify an
1983 * address's parameters:
1985 * struct sctp_paddrparams {
1986 * sctp_assoc_t spp_assoc_id;
1987 * struct sockaddr_storage spp_address;
1988 * uint32_t spp_hbinterval;
1989 * uint16_t spp_pathmaxrxt;
1990 * uint32_t spp_pathmtu;
1991 * uint32_t spp_sackdelay;
1992 * uint32_t spp_flags;
1995 * spp_assoc_id - (one-to-many style socket) This is filled in the
1996 * application, and identifies the association for
1998 * spp_address - This specifies which address is of interest.
1999 * spp_hbinterval - This contains the value of the heartbeat interval,
2000 * in milliseconds. If a value of zero
2001 * is present in this field then no changes are to
2002 * be made to this parameter.
2003 * spp_pathmaxrxt - This contains the maximum number of
2004 * retransmissions before this address shall be
2005 * considered unreachable. If a value of zero
2006 * is present in this field then no changes are to
2007 * be made to this parameter.
2008 * spp_pathmtu - When Path MTU discovery is disabled the value
2009 * specified here will be the "fixed" path mtu.
2010 * Note that if the spp_address field is empty
2011 * then all associations on this address will
2012 * have this fixed path mtu set upon them.
2014 * spp_sackdelay - When delayed sack is enabled, this value specifies
2015 * the number of milliseconds that sacks will be delayed
2016 * for. This value will apply to all addresses of an
2017 * association if the spp_address field is empty. Note
2018 * also, that if delayed sack is enabled and this
2019 * value is set to 0, no change is made to the last
2020 * recorded delayed sack timer value.
2022 * spp_flags - These flags are used to control various features
2023 * on an association. The flag field may contain
2024 * zero or more of the following options.
2026 * SPP_HB_ENABLE - Enable heartbeats on the
2027 * specified address. Note that if the address
2028 * field is empty all addresses for the association
2029 * have heartbeats enabled upon them.
2031 * SPP_HB_DISABLE - Disable heartbeats on the
2032 * speicifed address. Note that if the address
2033 * field is empty all addresses for the association
2034 * will have their heartbeats disabled. Note also
2035 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2036 * mutually exclusive, only one of these two should
2037 * be specified. Enabling both fields will have
2038 * undetermined results.
2040 * SPP_HB_DEMAND - Request a user initiated heartbeat
2041 * to be made immediately.
2043 * SPP_PMTUD_ENABLE - This field will enable PMTU
2044 * discovery upon the specified address. Note that
2045 * if the address feild is empty then all addresses
2046 * on the association are effected.
2048 * SPP_PMTUD_DISABLE - This field will disable PMTU
2049 * discovery upon the specified address. Note that
2050 * if the address feild is empty then all addresses
2051 * on the association are effected. Not also that
2052 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2053 * exclusive. Enabling both will have undetermined
2056 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2057 * on delayed sack. The time specified in spp_sackdelay
2058 * is used to specify the sack delay for this address. Note
2059 * that if spp_address is empty then all addresses will
2060 * enable delayed sack and take on the sack delay
2061 * value specified in spp_sackdelay.
2062 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2063 * off delayed sack. If the spp_address field is blank then
2064 * delayed sack is disabled for the entire association. Note
2065 * also that this field is mutually exclusive to
2066 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2069 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2070 struct sctp_transport
*trans
,
2071 struct sctp_association
*asoc
,
2072 struct sctp_sock
*sp
,
2075 int sackdelay_change
)
2079 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2080 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2085 if (params
->spp_hbinterval
) {
2087 trans
->hbinterval
= msecs_to_jiffies(params
->spp_hbinterval
);
2089 asoc
->hbinterval
= msecs_to_jiffies(params
->spp_hbinterval
);
2091 sp
->hbinterval
= params
->spp_hbinterval
;
2097 trans
->param_flags
=
2098 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2101 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2104 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2108 if (params
->spp_pathmtu
) {
2110 trans
->pathmtu
= params
->spp_pathmtu
;
2111 sctp_assoc_sync_pmtu(asoc
);
2113 asoc
->pathmtu
= params
->spp_pathmtu
;
2114 sctp_frag_point(sp
, params
->spp_pathmtu
);
2116 sp
->pathmtu
= params
->spp_pathmtu
;
2122 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2123 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2124 trans
->param_flags
=
2125 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2127 sctp_transport_pmtu(trans
);
2128 sctp_assoc_sync_pmtu(asoc
);
2132 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2135 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2139 if (params
->spp_sackdelay
) {
2142 msecs_to_jiffies(params
->spp_sackdelay
);
2145 msecs_to_jiffies(params
->spp_sackdelay
);
2147 sp
->sackdelay
= params
->spp_sackdelay
;
2151 if (sackdelay_change
) {
2153 trans
->param_flags
=
2154 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2158 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2162 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2167 if (params
->spp_pathmaxrxt
) {
2169 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2171 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2173 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2180 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2181 char __user
*optval
, int optlen
)
2183 struct sctp_paddrparams params
;
2184 struct sctp_transport
*trans
= NULL
;
2185 struct sctp_association
*asoc
= NULL
;
2186 struct sctp_sock
*sp
= sctp_sk(sk
);
2188 int hb_change
, pmtud_change
, sackdelay_change
;
2190 if (optlen
!= sizeof(struct sctp_paddrparams
))
2193 if (copy_from_user(¶ms
, optval
, optlen
))
2196 /* Validate flags and value parameters. */
2197 hb_change
= params
.spp_flags
& SPP_HB
;
2198 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2199 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2201 if (hb_change
== SPP_HB
||
2202 pmtud_change
== SPP_PMTUD
||
2203 sackdelay_change
== SPP_SACKDELAY
||
2204 params
.spp_sackdelay
> 500 ||
2206 && params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2209 /* If an address other than INADDR_ANY is specified, and
2210 * no transport is found, then the request is invalid.
2212 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
2213 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2214 params
.spp_assoc_id
);
2219 /* Get association, if assoc_id != 0 and the socket is a one
2220 * to many style socket, and an association was not found, then
2221 * the id was invalid.
2223 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2224 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2227 /* Heartbeat demand can only be sent on a transport or
2228 * association, but not a socket.
2230 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2233 /* Process parameters. */
2234 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2235 hb_change
, pmtud_change
,
2241 /* If changes are for association, also apply parameters to each
2244 if (!trans
&& asoc
) {
2245 struct list_head
*pos
;
2247 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2248 trans
= list_entry(pos
, struct sctp_transport
,
2250 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2251 hb_change
, pmtud_change
,
2259 /* 7.1.24. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
2261 * This options will get or set the delayed ack timer. The time is set
2262 * in milliseconds. If the assoc_id is 0, then this sets or gets the
2263 * endpoints default delayed ack timer value. If the assoc_id field is
2264 * non-zero, then the set or get effects the specified association.
2266 * struct sctp_assoc_value {
2267 * sctp_assoc_t assoc_id;
2268 * uint32_t assoc_value;
2271 * assoc_id - This parameter, indicates which association the
2272 * user is preforming an action upon. Note that if
2273 * this field's value is zero then the endpoints
2274 * default value is changed (effecting future
2275 * associations only).
2277 * assoc_value - This parameter contains the number of milliseconds
2278 * that the user is requesting the delayed ACK timer
2279 * be set to. Note that this value is defined in
2280 * the standard to be between 200 and 500 milliseconds.
2282 * Note: a value of zero will leave the value alone,
2283 * but disable SACK delay. A non-zero value will also
2284 * enable SACK delay.
2287 static int sctp_setsockopt_delayed_ack_time(struct sock
*sk
,
2288 char __user
*optval
, int optlen
)
2290 struct sctp_assoc_value params
;
2291 struct sctp_transport
*trans
= NULL
;
2292 struct sctp_association
*asoc
= NULL
;
2293 struct sctp_sock
*sp
= sctp_sk(sk
);
2295 if (optlen
!= sizeof(struct sctp_assoc_value
))
2298 if (copy_from_user(¶ms
, optval
, optlen
))
2301 /* Validate value parameter. */
2302 if (params
.assoc_value
> 500)
2305 /* Get association, if assoc_id != 0 and the socket is a one
2306 * to many style socket, and an association was not found, then
2307 * the id was invalid.
2309 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2310 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
2313 if (params
.assoc_value
) {
2316 msecs_to_jiffies(params
.assoc_value
);
2318 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2319 SPP_SACKDELAY_ENABLE
;
2321 sp
->sackdelay
= params
.assoc_value
;
2323 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2324 SPP_SACKDELAY_ENABLE
;
2329 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2330 SPP_SACKDELAY_DISABLE
;
2333 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2334 SPP_SACKDELAY_DISABLE
;
2338 /* If change is for association, also apply to each transport. */
2340 struct list_head
*pos
;
2342 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2343 trans
= list_entry(pos
, struct sctp_transport
,
2345 if (params
.assoc_value
) {
2347 msecs_to_jiffies(params
.assoc_value
);
2348 trans
->param_flags
=
2349 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2350 SPP_SACKDELAY_ENABLE
;
2352 trans
->param_flags
=
2353 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2354 SPP_SACKDELAY_DISABLE
;
2362 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2364 * Applications can specify protocol parameters for the default association
2365 * initialization. The option name argument to setsockopt() and getsockopt()
2368 * Setting initialization parameters is effective only on an unconnected
2369 * socket (for UDP-style sockets only future associations are effected
2370 * by the change). With TCP-style sockets, this option is inherited by
2371 * sockets derived from a listener socket.
2373 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, int optlen
)
2375 struct sctp_initmsg sinit
;
2376 struct sctp_sock
*sp
= sctp_sk(sk
);
2378 if (optlen
!= sizeof(struct sctp_initmsg
))
2380 if (copy_from_user(&sinit
, optval
, optlen
))
2383 if (sinit
.sinit_num_ostreams
)
2384 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2385 if (sinit
.sinit_max_instreams
)
2386 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2387 if (sinit
.sinit_max_attempts
)
2388 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2389 if (sinit
.sinit_max_init_timeo
)
2390 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2396 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2398 * Applications that wish to use the sendto() system call may wish to
2399 * specify a default set of parameters that would normally be supplied
2400 * through the inclusion of ancillary data. This socket option allows
2401 * such an application to set the default sctp_sndrcvinfo structure.
2402 * The application that wishes to use this socket option simply passes
2403 * in to this call the sctp_sndrcvinfo structure defined in Section
2404 * 5.2.2) The input parameters accepted by this call include
2405 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2406 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2407 * to this call if the caller is using the UDP model.
2409 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2410 char __user
*optval
, int optlen
)
2412 struct sctp_sndrcvinfo info
;
2413 struct sctp_association
*asoc
;
2414 struct sctp_sock
*sp
= sctp_sk(sk
);
2416 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2418 if (copy_from_user(&info
, optval
, optlen
))
2421 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2422 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2426 asoc
->default_stream
= info
.sinfo_stream
;
2427 asoc
->default_flags
= info
.sinfo_flags
;
2428 asoc
->default_ppid
= info
.sinfo_ppid
;
2429 asoc
->default_context
= info
.sinfo_context
;
2430 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2432 sp
->default_stream
= info
.sinfo_stream
;
2433 sp
->default_flags
= info
.sinfo_flags
;
2434 sp
->default_ppid
= info
.sinfo_ppid
;
2435 sp
->default_context
= info
.sinfo_context
;
2436 sp
->default_timetolive
= info
.sinfo_timetolive
;
2442 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2444 * Requests that the local SCTP stack use the enclosed peer address as
2445 * the association primary. The enclosed address must be one of the
2446 * association peer's addresses.
2448 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2451 struct sctp_prim prim
;
2452 struct sctp_transport
*trans
;
2454 if (optlen
!= sizeof(struct sctp_prim
))
2457 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2460 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2464 sctp_assoc_set_primary(trans
->asoc
, trans
);
2470 * 7.1.5 SCTP_NODELAY
2472 * Turn on/off any Nagle-like algorithm. This means that packets are
2473 * generally sent as soon as possible and no unnecessary delays are
2474 * introduced, at the cost of more packets in the network. Expects an
2475 * integer boolean flag.
2477 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2482 if (optlen
< sizeof(int))
2484 if (get_user(val
, (int __user
*)optval
))
2487 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2493 * 7.1.1 SCTP_RTOINFO
2495 * The protocol parameters used to initialize and bound retransmission
2496 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2497 * and modify these parameters.
2498 * All parameters are time values, in milliseconds. A value of 0, when
2499 * modifying the parameters, indicates that the current value should not
2503 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, int optlen
) {
2504 struct sctp_rtoinfo rtoinfo
;
2505 struct sctp_association
*asoc
;
2507 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2510 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2513 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2515 /* Set the values to the specific association */
2516 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2520 if (rtoinfo
.srto_initial
!= 0)
2522 msecs_to_jiffies(rtoinfo
.srto_initial
);
2523 if (rtoinfo
.srto_max
!= 0)
2524 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2525 if (rtoinfo
.srto_min
!= 0)
2526 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2528 /* If there is no association or the association-id = 0
2529 * set the values to the endpoint.
2531 struct sctp_sock
*sp
= sctp_sk(sk
);
2533 if (rtoinfo
.srto_initial
!= 0)
2534 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2535 if (rtoinfo
.srto_max
!= 0)
2536 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2537 if (rtoinfo
.srto_min
!= 0)
2538 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2546 * 7.1.2 SCTP_ASSOCINFO
2548 * This option is used to tune the the maximum retransmission attempts
2549 * of the association.
2550 * Returns an error if the new association retransmission value is
2551 * greater than the sum of the retransmission value of the peer.
2552 * See [SCTP] for more information.
2555 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, int optlen
)
2558 struct sctp_assocparams assocparams
;
2559 struct sctp_association
*asoc
;
2561 if (optlen
!= sizeof(struct sctp_assocparams
))
2563 if (copy_from_user(&assocparams
, optval
, optlen
))
2566 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2568 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2571 /* Set the values to the specific association */
2573 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2576 struct list_head
*pos
;
2577 struct sctp_transport
*peer_addr
;
2579 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2580 peer_addr
= list_entry(pos
,
2581 struct sctp_transport
,
2583 path_sum
+= peer_addr
->pathmaxrxt
;
2587 /* Only validate asocmaxrxt if we have more then
2588 * one path/transport. We do this because path
2589 * retransmissions are only counted when we have more
2593 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2596 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2599 if (assocparams
.sasoc_cookie_life
!= 0) {
2600 asoc
->cookie_life
.tv_sec
=
2601 assocparams
.sasoc_cookie_life
/ 1000;
2602 asoc
->cookie_life
.tv_usec
=
2603 (assocparams
.sasoc_cookie_life
% 1000)
2607 /* Set the values to the endpoint */
2608 struct sctp_sock
*sp
= sctp_sk(sk
);
2610 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2611 sp
->assocparams
.sasoc_asocmaxrxt
=
2612 assocparams
.sasoc_asocmaxrxt
;
2613 if (assocparams
.sasoc_cookie_life
!= 0)
2614 sp
->assocparams
.sasoc_cookie_life
=
2615 assocparams
.sasoc_cookie_life
;
2621 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2623 * This socket option is a boolean flag which turns on or off mapped V4
2624 * addresses. If this option is turned on and the socket is type
2625 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2626 * If this option is turned off, then no mapping will be done of V4
2627 * addresses and a user will receive both PF_INET6 and PF_INET type
2628 * addresses on the socket.
2630 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, int optlen
)
2633 struct sctp_sock
*sp
= sctp_sk(sk
);
2635 if (optlen
< sizeof(int))
2637 if (get_user(val
, (int __user
*)optval
))
2648 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2650 * This socket option specifies the maximum size to put in any outgoing
2651 * SCTP chunk. If a message is larger than this size it will be
2652 * fragmented by SCTP into the specified size. Note that the underlying
2653 * SCTP implementation may fragment into smaller sized chunks when the
2654 * PMTU of the underlying association is smaller than the value set by
2657 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, int optlen
)
2659 struct sctp_association
*asoc
;
2660 struct list_head
*pos
;
2661 struct sctp_sock
*sp
= sctp_sk(sk
);
2664 if (optlen
< sizeof(int))
2666 if (get_user(val
, (int __user
*)optval
))
2668 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2670 sp
->user_frag
= val
;
2672 /* Update the frag_point of the existing associations. */
2673 list_for_each(pos
, &(sp
->ep
->asocs
)) {
2674 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
2675 asoc
->frag_point
= sctp_frag_point(sp
, asoc
->pathmtu
);
2683 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2685 * Requests that the peer mark the enclosed address as the association
2686 * primary. The enclosed address must be one of the association's
2687 * locally bound addresses. The following structure is used to make a
2688 * set primary request:
2690 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2693 struct sctp_sock
*sp
;
2694 struct sctp_endpoint
*ep
;
2695 struct sctp_association
*asoc
= NULL
;
2696 struct sctp_setpeerprim prim
;
2697 struct sctp_chunk
*chunk
;
2703 if (!sctp_addip_enable
)
2706 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2709 if (copy_from_user(&prim
, optval
, optlen
))
2712 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2716 if (!asoc
->peer
.asconf_capable
)
2719 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2722 if (!sctp_state(asoc
, ESTABLISHED
))
2725 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2726 return -EADDRNOTAVAIL
;
2728 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2729 chunk
= sctp_make_asconf_set_prim(asoc
,
2730 (union sctp_addr
*)&prim
.sspp_addr
);
2734 err
= sctp_send_asconf(asoc
, chunk
);
2736 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2741 static int sctp_setsockopt_adaption_layer(struct sock
*sk
, char __user
*optval
,
2744 struct sctp_setadaption adaption
;
2746 if (optlen
!= sizeof(struct sctp_setadaption
))
2748 if (copy_from_user(&adaption
, optval
, optlen
))
2751 sctp_sk(sk
)->adaption_ind
= adaption
.ssb_adaption_ind
;
2756 /* API 6.2 setsockopt(), getsockopt()
2758 * Applications use setsockopt() and getsockopt() to set or retrieve
2759 * socket options. Socket options are used to change the default
2760 * behavior of sockets calls. They are described in Section 7.
2764 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
2765 * int __user *optlen);
2766 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
2769 * sd - the socket descript.
2770 * level - set to IPPROTO_SCTP for all SCTP options.
2771 * optname - the option name.
2772 * optval - the buffer to store the value of the option.
2773 * optlen - the size of the buffer.
2775 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
2776 char __user
*optval
, int optlen
)
2780 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
2783 /* I can hardly begin to describe how wrong this is. This is
2784 * so broken as to be worse than useless. The API draft
2785 * REALLY is NOT helpful here... I am not convinced that the
2786 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
2787 * are at all well-founded.
2789 if (level
!= SOL_SCTP
) {
2790 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
2791 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2798 case SCTP_SOCKOPT_BINDX_ADD
:
2799 /* 'optlen' is the size of the addresses buffer. */
2800 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2801 optlen
, SCTP_BINDX_ADD_ADDR
);
2804 case SCTP_SOCKOPT_BINDX_REM
:
2805 /* 'optlen' is the size of the addresses buffer. */
2806 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2807 optlen
, SCTP_BINDX_REM_ADDR
);
2810 case SCTP_SOCKOPT_CONNECTX
:
2811 /* 'optlen' is the size of the addresses buffer. */
2812 retval
= sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)optval
,
2816 case SCTP_DISABLE_FRAGMENTS
:
2817 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
2821 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
2824 case SCTP_AUTOCLOSE
:
2825 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
2828 case SCTP_PEER_ADDR_PARAMS
:
2829 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
2832 case SCTP_DELAYED_ACK_TIME
:
2833 retval
= sctp_setsockopt_delayed_ack_time(sk
, optval
, optlen
);
2837 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
2839 case SCTP_DEFAULT_SEND_PARAM
:
2840 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
2843 case SCTP_PRIMARY_ADDR
:
2844 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
2846 case SCTP_SET_PEER_PRIMARY_ADDR
:
2847 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
2850 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
2853 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
2855 case SCTP_ASSOCINFO
:
2856 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
2858 case SCTP_I_WANT_MAPPED_V4_ADDR
:
2859 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
2862 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
2864 case SCTP_ADAPTION_LAYER
:
2865 retval
= sctp_setsockopt_adaption_layer(sk
, optval
, optlen
);
2869 retval
= -ENOPROTOOPT
;
2873 sctp_release_sock(sk
);
2879 /* API 3.1.6 connect() - UDP Style Syntax
2881 * An application may use the connect() call in the UDP model to initiate an
2882 * association without sending data.
2886 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
2888 * sd: the socket descriptor to have a new association added to.
2890 * nam: the address structure (either struct sockaddr_in or struct
2891 * sockaddr_in6 defined in RFC2553 [7]).
2893 * len: the size of the address.
2895 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
2903 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
2904 __FUNCTION__
, sk
, addr
, addr_len
);
2906 /* Validate addr_len before calling common connect/connectx routine. */
2907 af
= sctp_get_af_specific(addr
->sa_family
);
2908 if (!af
|| addr_len
< af
->sockaddr_len
) {
2911 /* Pass correct addr len to common routine (so it knows there
2912 * is only one address being passed.
2914 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
);
2917 sctp_release_sock(sk
);
2921 /* FIXME: Write comments. */
2922 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
2924 return -EOPNOTSUPP
; /* STUB */
2927 /* 4.1.4 accept() - TCP Style Syntax
2929 * Applications use accept() call to remove an established SCTP
2930 * association from the accept queue of the endpoint. A new socket
2931 * descriptor will be returned from accept() to represent the newly
2932 * formed association.
2934 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
2936 struct sctp_sock
*sp
;
2937 struct sctp_endpoint
*ep
;
2938 struct sock
*newsk
= NULL
;
2939 struct sctp_association
*asoc
;
2948 if (!sctp_style(sk
, TCP
)) {
2949 error
= -EOPNOTSUPP
;
2953 if (!sctp_sstate(sk
, LISTENING
)) {
2958 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
2960 error
= sctp_wait_for_accept(sk
, timeo
);
2964 /* We treat the list of associations on the endpoint as the accept
2965 * queue and pick the first association on the list.
2967 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
2969 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
2975 /* Populate the fields of the newsk from the oldsk and migrate the
2976 * asoc to the newsk.
2978 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
2981 sctp_release_sock(sk
);
2986 /* The SCTP ioctl handler. */
2987 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
2989 return -ENOIOCTLCMD
;
2992 /* This is the function which gets called during socket creation to
2993 * initialized the SCTP-specific portion of the sock.
2994 * The sock structure should already be zero-filled memory.
2996 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
2998 struct sctp_endpoint
*ep
;
2999 struct sctp_sock
*sp
;
3001 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3005 /* Initialize the SCTP per socket area. */
3006 switch (sk
->sk_type
) {
3007 case SOCK_SEQPACKET
:
3008 sp
->type
= SCTP_SOCKET_UDP
;
3011 sp
->type
= SCTP_SOCKET_TCP
;
3014 return -ESOCKTNOSUPPORT
;
3017 /* Initialize default send parameters. These parameters can be
3018 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3020 sp
->default_stream
= 0;
3021 sp
->default_ppid
= 0;
3022 sp
->default_flags
= 0;
3023 sp
->default_context
= 0;
3024 sp
->default_timetolive
= 0;
3026 /* Initialize default setup parameters. These parameters
3027 * can be modified with the SCTP_INITMSG socket option or
3028 * overridden by the SCTP_INIT CMSG.
3030 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3031 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3032 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3033 sp
->initmsg
.sinit_max_init_timeo
= sctp_rto_max
;
3035 /* Initialize default RTO related parameters. These parameters can
3036 * be modified for with the SCTP_RTOINFO socket option.
3038 sp
->rtoinfo
.srto_initial
= sctp_rto_initial
;
3039 sp
->rtoinfo
.srto_max
= sctp_rto_max
;
3040 sp
->rtoinfo
.srto_min
= sctp_rto_min
;
3042 /* Initialize default association related parameters. These parameters
3043 * can be modified with the SCTP_ASSOCINFO socket option.
3045 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3046 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3047 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3048 sp
->assocparams
.sasoc_local_rwnd
= 0;
3049 sp
->assocparams
.sasoc_cookie_life
= sctp_valid_cookie_life
;
3051 /* Initialize default event subscriptions. By default, all the
3054 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3056 /* Default Peer Address Parameters. These defaults can
3057 * be modified via SCTP_PEER_ADDR_PARAMS
3059 sp
->hbinterval
= sctp_hb_interval
;
3060 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3061 sp
->pathmtu
= 0; // allow default discovery
3062 sp
->sackdelay
= sctp_sack_timeout
;
3063 sp
->param_flags
= SPP_HB_ENABLE
|
3065 SPP_SACKDELAY_ENABLE
;
3067 /* If enabled no SCTP message fragmentation will be performed.
3068 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3070 sp
->disable_fragments
= 0;
3072 /* Enable Nagle algorithm by default. */
3075 /* Enable by default. */
3078 /* Auto-close idle associations after the configured
3079 * number of seconds. A value of 0 disables this
3080 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3081 * for UDP-style sockets only.
3085 /* User specified fragmentation limit. */
3088 sp
->adaption_ind
= 0;
3090 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3092 /* Control variables for partial data delivery. */
3094 skb_queue_head_init(&sp
->pd_lobby
);
3096 /* Create a per socket endpoint structure. Even if we
3097 * change the data structure relationships, this may still
3098 * be useful for storing pre-connect address information.
3100 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3107 SCTP_DBG_OBJCNT_INC(sock
);
3111 /* Cleanup any SCTP per socket resources. */
3112 SCTP_STATIC
int sctp_destroy_sock(struct sock
*sk
)
3114 struct sctp_endpoint
*ep
;
3116 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3118 /* Release our hold on the endpoint. */
3119 ep
= sctp_sk(sk
)->ep
;
3120 sctp_endpoint_free(ep
);
3125 /* API 4.1.7 shutdown() - TCP Style Syntax
3126 * int shutdown(int socket, int how);
3128 * sd - the socket descriptor of the association to be closed.
3129 * how - Specifies the type of shutdown. The values are
3132 * Disables further receive operations. No SCTP
3133 * protocol action is taken.
3135 * Disables further send operations, and initiates
3136 * the SCTP shutdown sequence.
3138 * Disables further send and receive operations
3139 * and initiates the SCTP shutdown sequence.
3141 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3143 struct sctp_endpoint
*ep
;
3144 struct sctp_association
*asoc
;
3146 if (!sctp_style(sk
, TCP
))
3149 if (how
& SEND_SHUTDOWN
) {
3150 ep
= sctp_sk(sk
)->ep
;
3151 if (!list_empty(&ep
->asocs
)) {
3152 asoc
= list_entry(ep
->asocs
.next
,
3153 struct sctp_association
, asocs
);
3154 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3159 /* 7.2.1 Association Status (SCTP_STATUS)
3161 * Applications can retrieve current status information about an
3162 * association, including association state, peer receiver window size,
3163 * number of unacked data chunks, and number of data chunks pending
3164 * receipt. This information is read-only.
3166 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3167 char __user
*optval
,
3170 struct sctp_status status
;
3171 struct sctp_association
*asoc
= NULL
;
3172 struct sctp_transport
*transport
;
3173 sctp_assoc_t associd
;
3176 if (len
!= sizeof(status
)) {
3181 if (copy_from_user(&status
, optval
, sizeof(status
))) {
3186 associd
= status
.sstat_assoc_id
;
3187 asoc
= sctp_id2assoc(sk
, associd
);
3193 transport
= asoc
->peer
.primary_path
;
3195 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3196 status
.sstat_state
= asoc
->state
;
3197 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3198 status
.sstat_unackdata
= asoc
->unack_data
;
3200 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3201 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3202 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3203 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3204 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3205 flip_to_n((union sctp_addr
*)&status
.sstat_primary
.spinfo_address
,
3206 &transport
->ipaddr_h
);
3207 /* Map ipv4 address into v4-mapped-on-v6 address. */
3208 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3209 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3210 status
.sstat_primary
.spinfo_state
= transport
->state
;
3211 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3212 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3213 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3214 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3216 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3217 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3219 if (put_user(len
, optlen
)) {
3224 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3225 len
, status
.sstat_state
, status
.sstat_rwnd
,
3226 status
.sstat_assoc_id
);
3228 if (copy_to_user(optval
, &status
, len
)) {
3238 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3240 * Applications can retrieve information about a specific peer address
3241 * of an association, including its reachability state, congestion
3242 * window, and retransmission timer values. This information is
3245 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3246 char __user
*optval
,
3249 struct sctp_paddrinfo pinfo
;
3250 struct sctp_transport
*transport
;
3253 if (len
!= sizeof(pinfo
)) {
3258 if (copy_from_user(&pinfo
, optval
, sizeof(pinfo
))) {
3263 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3264 pinfo
.spinfo_assoc_id
);
3268 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3269 pinfo
.spinfo_state
= transport
->state
;
3270 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3271 pinfo
.spinfo_srtt
= transport
->srtt
;
3272 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3273 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3275 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3276 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3278 if (put_user(len
, optlen
)) {
3283 if (copy_to_user(optval
, &pinfo
, len
)) {
3292 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3294 * This option is a on/off flag. If enabled no SCTP message
3295 * fragmentation will be performed. Instead if a message being sent
3296 * exceeds the current PMTU size, the message will NOT be sent and
3297 * instead a error will be indicated to the user.
3299 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3300 char __user
*optval
, int __user
*optlen
)
3304 if (len
< sizeof(int))
3308 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3309 if (put_user(len
, optlen
))
3311 if (copy_to_user(optval
, &val
, len
))
3316 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3318 * This socket option is used to specify various notifications and
3319 * ancillary data the user wishes to receive.
3321 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
3324 if (len
!= sizeof(struct sctp_event_subscribe
))
3326 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
3331 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3333 * This socket option is applicable to the UDP-style socket only. When
3334 * set it will cause associations that are idle for more than the
3335 * specified number of seconds to automatically close. An association
3336 * being idle is defined an association that has NOT sent or received
3337 * user data. The special value of '0' indicates that no automatic
3338 * close of any associations should be performed. The option expects an
3339 * integer defining the number of seconds of idle time before an
3340 * association is closed.
3342 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3344 /* Applicable to UDP-style socket only */
3345 if (sctp_style(sk
, TCP
))
3347 if (len
!= sizeof(int))
3349 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, len
))
3354 /* Helper routine to branch off an association to a new socket. */
3355 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3356 struct socket
**sockp
)
3358 struct sock
*sk
= asoc
->base
.sk
;
3359 struct socket
*sock
;
3360 struct inet_sock
*inetsk
;
3363 /* An association cannot be branched off from an already peeled-off
3364 * socket, nor is this supported for tcp style sockets.
3366 if (!sctp_style(sk
, UDP
))
3369 /* Create a new socket. */
3370 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
3374 /* Populate the fields of the newsk from the oldsk and migrate the
3375 * asoc to the newsk.
3377 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
3379 /* Make peeled-off sockets more like 1-1 accepted sockets.
3380 * Set the daddr and initialize id to something more random
3382 inetsk
= inet_sk(sock
->sk
);
3383 inetsk
->daddr
= asoc
->peer
.primary_addr
.v4
.sin_addr
.s_addr
;
3384 inetsk
->id
= asoc
->next_tsn
^ jiffies
;
3391 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3393 sctp_peeloff_arg_t peeloff
;
3394 struct socket
*newsock
;
3396 struct sctp_association
*asoc
;
3398 if (len
!= sizeof(sctp_peeloff_arg_t
))
3400 if (copy_from_user(&peeloff
, optval
, len
))
3403 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
3409 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __FUNCTION__
, sk
, asoc
);
3411 retval
= sctp_do_peeloff(asoc
, &newsock
);
3415 /* Map the socket to an unused fd that can be returned to the user. */
3416 retval
= sock_map_fd(newsock
);
3418 sock_release(newsock
);
3422 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3423 __FUNCTION__
, sk
, asoc
, newsock
->sk
, retval
);
3425 /* Return the fd mapped to the new socket. */
3426 peeloff
.sd
= retval
;
3427 if (copy_to_user(optval
, &peeloff
, len
))
3434 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3436 * Applications can enable or disable heartbeats for any peer address of
3437 * an association, modify an address's heartbeat interval, force a
3438 * heartbeat to be sent immediately, and adjust the address's maximum
3439 * number of retransmissions sent before an address is considered
3440 * unreachable. The following structure is used to access and modify an
3441 * address's parameters:
3443 * struct sctp_paddrparams {
3444 * sctp_assoc_t spp_assoc_id;
3445 * struct sockaddr_storage spp_address;
3446 * uint32_t spp_hbinterval;
3447 * uint16_t spp_pathmaxrxt;
3448 * uint32_t spp_pathmtu;
3449 * uint32_t spp_sackdelay;
3450 * uint32_t spp_flags;
3453 * spp_assoc_id - (one-to-many style socket) This is filled in the
3454 * application, and identifies the association for
3456 * spp_address - This specifies which address is of interest.
3457 * spp_hbinterval - This contains the value of the heartbeat interval,
3458 * in milliseconds. If a value of zero
3459 * is present in this field then no changes are to
3460 * be made to this parameter.
3461 * spp_pathmaxrxt - This contains the maximum number of
3462 * retransmissions before this address shall be
3463 * considered unreachable. If a value of zero
3464 * is present in this field then no changes are to
3465 * be made to this parameter.
3466 * spp_pathmtu - When Path MTU discovery is disabled the value
3467 * specified here will be the "fixed" path mtu.
3468 * Note that if the spp_address field is empty
3469 * then all associations on this address will
3470 * have this fixed path mtu set upon them.
3472 * spp_sackdelay - When delayed sack is enabled, this value specifies
3473 * the number of milliseconds that sacks will be delayed
3474 * for. This value will apply to all addresses of an
3475 * association if the spp_address field is empty. Note
3476 * also, that if delayed sack is enabled and this
3477 * value is set to 0, no change is made to the last
3478 * recorded delayed sack timer value.
3480 * spp_flags - These flags are used to control various features
3481 * on an association. The flag field may contain
3482 * zero or more of the following options.
3484 * SPP_HB_ENABLE - Enable heartbeats on the
3485 * specified address. Note that if the address
3486 * field is empty all addresses for the association
3487 * have heartbeats enabled upon them.
3489 * SPP_HB_DISABLE - Disable heartbeats on the
3490 * speicifed address. Note that if the address
3491 * field is empty all addresses for the association
3492 * will have their heartbeats disabled. Note also
3493 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
3494 * mutually exclusive, only one of these two should
3495 * be specified. Enabling both fields will have
3496 * undetermined results.
3498 * SPP_HB_DEMAND - Request a user initiated heartbeat
3499 * to be made immediately.
3501 * SPP_PMTUD_ENABLE - This field will enable 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.
3506 * SPP_PMTUD_DISABLE - This field will disable PMTU
3507 * discovery upon the specified address. Note that
3508 * if the address feild is empty then all addresses
3509 * on the association are effected. Not also that
3510 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
3511 * exclusive. Enabling both will have undetermined
3514 * SPP_SACKDELAY_ENABLE - Setting this flag turns
3515 * on delayed sack. The time specified in spp_sackdelay
3516 * is used to specify the sack delay for this address. Note
3517 * that if spp_address is empty then all addresses will
3518 * enable delayed sack and take on the sack delay
3519 * value specified in spp_sackdelay.
3520 * SPP_SACKDELAY_DISABLE - Setting this flag turns
3521 * off delayed sack. If the spp_address field is blank then
3522 * delayed sack is disabled for the entire association. Note
3523 * also that this field is mutually exclusive to
3524 * SPP_SACKDELAY_ENABLE, setting both will have undefined
3527 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
3528 char __user
*optval
, int __user
*optlen
)
3530 struct sctp_paddrparams params
;
3531 struct sctp_transport
*trans
= NULL
;
3532 struct sctp_association
*asoc
= NULL
;
3533 struct sctp_sock
*sp
= sctp_sk(sk
);
3535 if (len
!= sizeof(struct sctp_paddrparams
))
3538 if (copy_from_user(¶ms
, optval
, len
))
3541 /* If an address other than INADDR_ANY is specified, and
3542 * no transport is found, then the request is invalid.
3544 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
3545 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
3546 params
.spp_assoc_id
);
3548 SCTP_DEBUG_PRINTK("Failed no transport\n");
3553 /* Get association, if assoc_id != 0 and the socket is a one
3554 * to many style socket, and an association was not found, then
3555 * the id was invalid.
3557 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
3558 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
3559 SCTP_DEBUG_PRINTK("Failed no association\n");
3564 /* Fetch transport values. */
3565 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
3566 params
.spp_pathmtu
= trans
->pathmtu
;
3567 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
3568 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
3570 /*draft-11 doesn't say what to return in spp_flags*/
3571 params
.spp_flags
= trans
->param_flags
;
3573 /* Fetch association values. */
3574 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
3575 params
.spp_pathmtu
= asoc
->pathmtu
;
3576 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
3577 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
3579 /*draft-11 doesn't say what to return in spp_flags*/
3580 params
.spp_flags
= asoc
->param_flags
;
3582 /* Fetch socket values. */
3583 params
.spp_hbinterval
= sp
->hbinterval
;
3584 params
.spp_pathmtu
= sp
->pathmtu
;
3585 params
.spp_sackdelay
= sp
->sackdelay
;
3586 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
3588 /*draft-11 doesn't say what to return in spp_flags*/
3589 params
.spp_flags
= sp
->param_flags
;
3592 if (copy_to_user(optval
, ¶ms
, len
))
3595 if (put_user(len
, optlen
))
3601 /* 7.1.24. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
3603 * This options will get or set the delayed ack timer. The time is set
3604 * in milliseconds. If the assoc_id is 0, then this sets or gets the
3605 * endpoints default delayed ack timer value. If the assoc_id field is
3606 * non-zero, then the set or get effects the specified association.
3608 * struct sctp_assoc_value {
3609 * sctp_assoc_t assoc_id;
3610 * uint32_t assoc_value;
3613 * assoc_id - This parameter, indicates which association the
3614 * user is preforming an action upon. Note that if
3615 * this field's value is zero then the endpoints
3616 * default value is changed (effecting future
3617 * associations only).
3619 * assoc_value - This parameter contains the number of milliseconds
3620 * that the user is requesting the delayed ACK timer
3621 * be set to. Note that this value is defined in
3622 * the standard to be between 200 and 500 milliseconds.
3624 * Note: a value of zero will leave the value alone,
3625 * but disable SACK delay. A non-zero value will also
3626 * enable SACK delay.
3628 static int sctp_getsockopt_delayed_ack_time(struct sock
*sk
, int len
,
3629 char __user
*optval
,
3632 struct sctp_assoc_value params
;
3633 struct sctp_association
*asoc
= NULL
;
3634 struct sctp_sock
*sp
= sctp_sk(sk
);
3636 if (len
!= sizeof(struct sctp_assoc_value
))
3639 if (copy_from_user(¶ms
, optval
, len
))
3642 /* Get association, if assoc_id != 0 and the socket is a one
3643 * to many style socket, and an association was not found, then
3644 * the id was invalid.
3646 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3647 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
3651 /* Fetch association values. */
3652 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
)
3653 params
.assoc_value
= jiffies_to_msecs(
3656 params
.assoc_value
= 0;
3658 /* Fetch socket values. */
3659 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
)
3660 params
.assoc_value
= sp
->sackdelay
;
3662 params
.assoc_value
= 0;
3665 if (copy_to_user(optval
, ¶ms
, len
))
3668 if (put_user(len
, optlen
))
3674 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
3676 * Applications can specify protocol parameters for the default association
3677 * initialization. The option name argument to setsockopt() and getsockopt()
3680 * Setting initialization parameters is effective only on an unconnected
3681 * socket (for UDP-style sockets only future associations are effected
3682 * by the change). With TCP-style sockets, this option is inherited by
3683 * sockets derived from a listener socket.
3685 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3687 if (len
!= sizeof(struct sctp_initmsg
))
3689 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
3694 static int sctp_getsockopt_peer_addrs_num_old(struct sock
*sk
, int len
,
3695 char __user
*optval
,
3699 struct sctp_association
*asoc
;
3700 struct list_head
*pos
;
3703 if (len
!= sizeof(sctp_assoc_t
))
3706 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
3709 /* For UDP-style sockets, id specifies the association to query. */
3710 asoc
= sctp_id2assoc(sk
, id
);
3714 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3722 * Old API for getting list of peer addresses. Does not work for 32-bit
3723 * programs running on a 64-bit kernel
3725 static int sctp_getsockopt_peer_addrs_old(struct sock
*sk
, int len
,
3726 char __user
*optval
,
3729 struct sctp_association
*asoc
;
3730 struct list_head
*pos
;
3732 struct sctp_getaddrs_old getaddrs
;
3733 struct sctp_transport
*from
;
3735 union sctp_addr temp
;
3736 struct sctp_sock
*sp
= sctp_sk(sk
);
3739 if (len
!= sizeof(struct sctp_getaddrs_old
))
3742 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs_old
)))
3745 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
3747 /* For UDP-style sockets, id specifies the association to query. */
3748 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3752 to
= (void __user
*)getaddrs
.addrs
;
3753 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3754 from
= list_entry(pos
, struct sctp_transport
, transports
);
3755 memcpy(&temp
, &from
->ipaddr_h
, sizeof(temp
));
3756 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3757 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3758 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3759 if (copy_to_user(to
, &temp
, addrlen
))
3763 if (cnt
>= getaddrs
.addr_num
) break;
3765 getaddrs
.addr_num
= cnt
;
3766 if (copy_to_user(optval
, &getaddrs
, sizeof(struct sctp_getaddrs_old
)))
3772 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
3773 char __user
*optval
, int __user
*optlen
)
3775 struct sctp_association
*asoc
;
3776 struct list_head
*pos
;
3778 struct sctp_getaddrs getaddrs
;
3779 struct sctp_transport
*from
;
3781 union sctp_addr temp
;
3782 struct sctp_sock
*sp
= sctp_sk(sk
);
3787 if (len
< sizeof(struct sctp_getaddrs
))
3790 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
3793 /* For UDP-style sockets, id specifies the association to query. */
3794 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3798 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
3799 space_left
= len
- sizeof(struct sctp_getaddrs
) -
3800 offsetof(struct sctp_getaddrs
,addrs
);
3802 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3803 from
= list_entry(pos
, struct sctp_transport
, transports
);
3804 memcpy(&temp
, &from
->ipaddr_h
, sizeof(temp
));
3805 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3806 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3807 if(space_left
< addrlen
)
3809 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3810 if (copy_to_user(to
, &temp
, addrlen
))
3814 space_left
-= addrlen
;
3817 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
3819 bytes_copied
= ((char __user
*)to
) - optval
;
3820 if (put_user(bytes_copied
, optlen
))
3826 static int sctp_getsockopt_local_addrs_num_old(struct sock
*sk
, int len
,
3827 char __user
*optval
,
3831 struct sctp_bind_addr
*bp
;
3832 struct sctp_association
*asoc
;
3833 struct list_head
*pos
;
3834 struct sctp_sockaddr_entry
*addr
;
3835 rwlock_t
*addr_lock
;
3836 unsigned long flags
;
3839 if (len
!= sizeof(sctp_assoc_t
))
3842 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
3846 * For UDP-style sockets, id specifies the association to query.
3847 * If the id field is set to the value '0' then the locally bound
3848 * addresses are returned without regard to any particular
3852 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
3853 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
3855 asoc
= sctp_id2assoc(sk
, id
);
3858 bp
= &asoc
->base
.bind_addr
;
3859 addr_lock
= &asoc
->base
.addr_lock
;
3862 sctp_read_lock(addr_lock
);
3864 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
3865 * addresses from the global local address list.
3867 if (sctp_list_single_entry(&bp
->address_list
)) {
3868 addr
= list_entry(bp
->address_list
.next
,
3869 struct sctp_sockaddr_entry
, list
);
3870 if (sctp_is_any(&addr
->a_h
)) {
3871 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3872 list_for_each(pos
, &sctp_local_addr_list
) {
3873 addr
= list_entry(pos
,
3874 struct sctp_sockaddr_entry
,
3876 if ((PF_INET
== sk
->sk_family
) &&
3877 (AF_INET6
== addr
->a_h
.sa
.sa_family
))
3881 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3889 list_for_each(pos
, &bp
->address_list
) {
3894 sctp_read_unlock(addr_lock
);
3898 /* Helper function that copies local addresses to user and returns the number
3899 * of addresses copied.
3901 static int sctp_copy_laddrs_to_user_old(struct sock
*sk
, __u16 port
, int max_addrs
,
3904 struct list_head
*pos
;
3905 struct sctp_sockaddr_entry
*addr
;
3906 unsigned long flags
;
3907 union sctp_addr temp
;
3911 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3912 list_for_each(pos
, &sctp_local_addr_list
) {
3913 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3914 if ((PF_INET
== sk
->sk_family
) &&
3915 (AF_INET6
== addr
->a_h
.sa
.sa_family
))
3917 memcpy(&temp
, &addr
->a_h
, sizeof(temp
));
3918 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3920 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3921 temp
.v4
.sin_port
= htons(port
);
3922 if (copy_to_user(to
, &temp
, addrlen
)) {
3923 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3929 if (cnt
>= max_addrs
) break;
3931 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
3936 static int sctp_copy_laddrs_to_user(struct sock
*sk
, __u16 port
,
3937 void __user
**to
, size_t space_left
)
3939 struct list_head
*pos
;
3940 struct sctp_sockaddr_entry
*addr
;
3941 unsigned long flags
;
3942 union sctp_addr temp
;
3946 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3947 list_for_each(pos
, &sctp_local_addr_list
) {
3948 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3949 if ((PF_INET
== sk
->sk_family
) &&
3950 (AF_INET6
== addr
->a_h
.sa
.sa_family
))
3952 memcpy(&temp
, &addr
->a_h
, sizeof(temp
));
3953 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3955 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3956 if(space_left
<addrlen
)
3958 temp
.v4
.sin_port
= htons(port
);
3959 if (copy_to_user(*to
, &temp
, addrlen
)) {
3960 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3966 space_left
-= addrlen
;
3968 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
3973 /* Old API for getting list of local addresses. Does not work for 32-bit
3974 * programs running on a 64-bit kernel
3976 static int sctp_getsockopt_local_addrs_old(struct sock
*sk
, int len
,
3977 char __user
*optval
, int __user
*optlen
)
3979 struct sctp_bind_addr
*bp
;
3980 struct sctp_association
*asoc
;
3981 struct list_head
*pos
;
3983 struct sctp_getaddrs_old getaddrs
;
3984 struct sctp_sockaddr_entry
*addr
;
3986 union sctp_addr temp
;
3987 struct sctp_sock
*sp
= sctp_sk(sk
);
3989 rwlock_t
*addr_lock
;
3992 if (len
!= sizeof(struct sctp_getaddrs_old
))
3995 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs_old
)))
3998 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
4000 * For UDP-style sockets, id specifies the association to query.
4001 * If the id field is set to the value '0' then the locally bound
4002 * addresses are returned without regard to any particular
4005 if (0 == getaddrs
.assoc_id
) {
4006 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4007 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4009 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4012 bp
= &asoc
->base
.bind_addr
;
4013 addr_lock
= &asoc
->base
.addr_lock
;
4016 to
= getaddrs
.addrs
;
4018 sctp_read_lock(addr_lock
);
4020 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4021 * addresses from the global local address list.
4023 if (sctp_list_single_entry(&bp
->address_list
)) {
4024 addr
= list_entry(bp
->address_list
.next
,
4025 struct sctp_sockaddr_entry
, list
);
4026 if (sctp_is_any(&addr
->a_h
)) {
4027 cnt
= sctp_copy_laddrs_to_user_old(sk
, bp
->port
,
4038 list_for_each(pos
, &bp
->address_list
) {
4039 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4040 memcpy(&temp
, &addr
->a_h
, sizeof(temp
));
4041 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4042 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4043 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
4044 if (copy_to_user(to
, &temp
, addrlen
)) {
4050 if (cnt
>= getaddrs
.addr_num
) break;
4054 getaddrs
.addr_num
= cnt
;
4055 if (copy_to_user(optval
, &getaddrs
, sizeof(struct sctp_getaddrs_old
)))
4059 sctp_read_unlock(addr_lock
);
4063 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4064 char __user
*optval
, int __user
*optlen
)
4066 struct sctp_bind_addr
*bp
;
4067 struct sctp_association
*asoc
;
4068 struct list_head
*pos
;
4070 struct sctp_getaddrs getaddrs
;
4071 struct sctp_sockaddr_entry
*addr
;
4073 union sctp_addr temp
;
4074 struct sctp_sock
*sp
= sctp_sk(sk
);
4076 rwlock_t
*addr_lock
;
4081 if (len
<= sizeof(struct sctp_getaddrs
))
4084 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4088 * For UDP-style sockets, id specifies the association to query.
4089 * If the id field is set to the value '0' then the locally bound
4090 * addresses are returned without regard to any particular
4093 if (0 == getaddrs
.assoc_id
) {
4094 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4095 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4097 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4100 bp
= &asoc
->base
.bind_addr
;
4101 addr_lock
= &asoc
->base
.addr_lock
;
4104 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4105 space_left
= len
- sizeof(struct sctp_getaddrs
) -
4106 offsetof(struct sctp_getaddrs
,addrs
);
4108 sctp_read_lock(addr_lock
);
4110 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4111 * addresses from the global local address list.
4113 if (sctp_list_single_entry(&bp
->address_list
)) {
4114 addr
= list_entry(bp
->address_list
.next
,
4115 struct sctp_sockaddr_entry
, list
);
4116 if (sctp_is_any(&addr
->a_h
)) {
4117 cnt
= sctp_copy_laddrs_to_user(sk
, bp
->port
,
4127 list_for_each(pos
, &bp
->address_list
) {
4128 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4129 memcpy(&temp
, &addr
->a_h
, sizeof(temp
));
4130 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4131 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4132 if(space_left
< addrlen
)
4133 return -ENOMEM
; /*fixme: right error?*/
4134 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
4135 if (copy_to_user(to
, &temp
, addrlen
)) {
4141 space_left
-= addrlen
;
4145 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4147 bytes_copied
= ((char __user
*)to
) - optval
;
4148 if (put_user(bytes_copied
, optlen
))
4152 sctp_read_unlock(addr_lock
);
4156 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4158 * Requests that the local SCTP stack use the enclosed peer address as
4159 * the association primary. The enclosed address must be one of the
4160 * association peer's addresses.
4162 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4163 char __user
*optval
, int __user
*optlen
)
4165 struct sctp_prim prim
;
4166 struct sctp_association
*asoc
;
4167 struct sctp_sock
*sp
= sctp_sk(sk
);
4169 if (len
!= sizeof(struct sctp_prim
))
4172 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
4175 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4179 if (!asoc
->peer
.primary_path
)
4182 flip_to_n((union sctp_addr
*)&prim
.ssp_addr
,
4183 &asoc
->peer
.primary_path
->ipaddr_h
);
4185 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4186 (union sctp_addr
*)&prim
.ssp_addr
);
4188 if (copy_to_user(optval
, &prim
, sizeof(struct sctp_prim
)))
4195 * 7.1.11 Set Adaption Layer Indicator (SCTP_ADAPTION_LAYER)
4197 * Requests that the local endpoint set the specified Adaption Layer
4198 * Indication parameter for all future INIT and INIT-ACK exchanges.
4200 static int sctp_getsockopt_adaption_layer(struct sock
*sk
, int len
,
4201 char __user
*optval
, int __user
*optlen
)
4203 struct sctp_setadaption adaption
;
4205 if (len
!= sizeof(struct sctp_setadaption
))
4208 adaption
.ssb_adaption_ind
= sctp_sk(sk
)->adaption_ind
;
4209 if (copy_to_user(optval
, &adaption
, len
))
4217 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4219 * Applications that wish to use the sendto() system call may wish to
4220 * specify a default set of parameters that would normally be supplied
4221 * through the inclusion of ancillary data. This socket option allows
4222 * such an application to set the default sctp_sndrcvinfo structure.
4225 * The application that wishes to use this socket option simply passes
4226 * in to this call the sctp_sndrcvinfo structure defined in Section
4227 * 5.2.2) The input parameters accepted by this call include
4228 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4229 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4230 * to this call if the caller is using the UDP model.
4232 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4234 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4235 int len
, char __user
*optval
,
4238 struct sctp_sndrcvinfo info
;
4239 struct sctp_association
*asoc
;
4240 struct sctp_sock
*sp
= sctp_sk(sk
);
4242 if (len
!= sizeof(struct sctp_sndrcvinfo
))
4244 if (copy_from_user(&info
, optval
, sizeof(struct sctp_sndrcvinfo
)))
4247 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4248 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4252 info
.sinfo_stream
= asoc
->default_stream
;
4253 info
.sinfo_flags
= asoc
->default_flags
;
4254 info
.sinfo_ppid
= asoc
->default_ppid
;
4255 info
.sinfo_context
= asoc
->default_context
;
4256 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4258 info
.sinfo_stream
= sp
->default_stream
;
4259 info
.sinfo_flags
= sp
->default_flags
;
4260 info
.sinfo_ppid
= sp
->default_ppid
;
4261 info
.sinfo_context
= sp
->default_context
;
4262 info
.sinfo_timetolive
= sp
->default_timetolive
;
4265 if (copy_to_user(optval
, &info
, sizeof(struct sctp_sndrcvinfo
)))
4273 * 7.1.5 SCTP_NODELAY
4275 * Turn on/off any Nagle-like algorithm. This means that packets are
4276 * generally sent as soon as possible and no unnecessary delays are
4277 * introduced, at the cost of more packets in the network. Expects an
4278 * integer boolean flag.
4281 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4282 char __user
*optval
, int __user
*optlen
)
4286 if (len
< sizeof(int))
4290 val
= (sctp_sk(sk
)->nodelay
== 1);
4291 if (put_user(len
, optlen
))
4293 if (copy_to_user(optval
, &val
, len
))
4300 * 7.1.1 SCTP_RTOINFO
4302 * The protocol parameters used to initialize and bound retransmission
4303 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4304 * and modify these parameters.
4305 * All parameters are time values, in milliseconds. A value of 0, when
4306 * modifying the parameters, indicates that the current value should not
4310 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4311 char __user
*optval
,
4312 int __user
*optlen
) {
4313 struct sctp_rtoinfo rtoinfo
;
4314 struct sctp_association
*asoc
;
4316 if (len
!= sizeof (struct sctp_rtoinfo
))
4319 if (copy_from_user(&rtoinfo
, optval
, sizeof (struct sctp_rtoinfo
)))
4322 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4324 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4327 /* Values corresponding to the specific association. */
4329 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4330 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4331 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4333 /* Values corresponding to the endpoint. */
4334 struct sctp_sock
*sp
= sctp_sk(sk
);
4336 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4337 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4338 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4341 if (put_user(len
, optlen
))
4344 if (copy_to_user(optval
, &rtoinfo
, len
))
4352 * 7.1.2 SCTP_ASSOCINFO
4354 * This option is used to tune the the maximum retransmission attempts
4355 * of the association.
4356 * Returns an error if the new association retransmission value is
4357 * greater than the sum of the retransmission value of the peer.
4358 * See [SCTP] for more information.
4361 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4362 char __user
*optval
,
4366 struct sctp_assocparams assocparams
;
4367 struct sctp_association
*asoc
;
4368 struct list_head
*pos
;
4371 if (len
!= sizeof (struct sctp_assocparams
))
4374 if (copy_from_user(&assocparams
, optval
,
4375 sizeof (struct sctp_assocparams
)))
4378 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4380 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4383 /* Values correspoinding to the specific association */
4385 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4386 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4387 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4388 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4390 (asoc
->cookie_life
.tv_usec
4393 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4397 assocparams
.sasoc_number_peer_destinations
= cnt
;
4399 /* Values corresponding to the endpoint */
4400 struct sctp_sock
*sp
= sctp_sk(sk
);
4402 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4403 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4404 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4405 assocparams
.sasoc_cookie_life
=
4406 sp
->assocparams
.sasoc_cookie_life
;
4407 assocparams
.sasoc_number_peer_destinations
=
4409 sasoc_number_peer_destinations
;
4412 if (put_user(len
, optlen
))
4415 if (copy_to_user(optval
, &assocparams
, len
))
4422 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4424 * This socket option is a boolean flag which turns on or off mapped V4
4425 * addresses. If this option is turned on and the socket is type
4426 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4427 * If this option is turned off, then no mapping will be done of V4
4428 * addresses and a user will receive both PF_INET6 and PF_INET type
4429 * addresses on the socket.
4431 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
4432 char __user
*optval
, int __user
*optlen
)
4435 struct sctp_sock
*sp
= sctp_sk(sk
);
4437 if (len
< sizeof(int))
4442 if (put_user(len
, optlen
))
4444 if (copy_to_user(optval
, &val
, len
))
4451 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
4453 * This socket option specifies the maximum size to put in any outgoing
4454 * SCTP chunk. If a message is larger than this size it will be
4455 * fragmented by SCTP into the specified size. Note that the underlying
4456 * SCTP implementation may fragment into smaller sized chunks when the
4457 * PMTU of the underlying association is smaller than the value set by
4460 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
4461 char __user
*optval
, int __user
*optlen
)
4465 if (len
< sizeof(int))
4470 val
= sctp_sk(sk
)->user_frag
;
4471 if (put_user(len
, optlen
))
4473 if (copy_to_user(optval
, &val
, len
))
4479 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
4480 char __user
*optval
, int __user
*optlen
)
4485 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
4488 /* I can hardly begin to describe how wrong this is. This is
4489 * so broken as to be worse than useless. The API draft
4490 * REALLY is NOT helpful here... I am not convinced that the
4491 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
4492 * are at all well-founded.
4494 if (level
!= SOL_SCTP
) {
4495 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
4497 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
4501 if (get_user(len
, optlen
))
4508 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
4510 case SCTP_DISABLE_FRAGMENTS
:
4511 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
4515 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
4517 case SCTP_AUTOCLOSE
:
4518 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
4520 case SCTP_SOCKOPT_PEELOFF
:
4521 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
4523 case SCTP_PEER_ADDR_PARAMS
:
4524 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
4527 case SCTP_DELAYED_ACK_TIME
:
4528 retval
= sctp_getsockopt_delayed_ack_time(sk
, len
, optval
,
4532 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
4534 case SCTP_GET_PEER_ADDRS_NUM_OLD
:
4535 retval
= sctp_getsockopt_peer_addrs_num_old(sk
, len
, optval
,
4538 case SCTP_GET_LOCAL_ADDRS_NUM_OLD
:
4539 retval
= sctp_getsockopt_local_addrs_num_old(sk
, len
, optval
,
4542 case SCTP_GET_PEER_ADDRS_OLD
:
4543 retval
= sctp_getsockopt_peer_addrs_old(sk
, len
, optval
,
4546 case SCTP_GET_LOCAL_ADDRS_OLD
:
4547 retval
= sctp_getsockopt_local_addrs_old(sk
, len
, optval
,
4550 case SCTP_GET_PEER_ADDRS
:
4551 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
4554 case SCTP_GET_LOCAL_ADDRS
:
4555 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
4558 case SCTP_DEFAULT_SEND_PARAM
:
4559 retval
= sctp_getsockopt_default_send_param(sk
, len
,
4562 case SCTP_PRIMARY_ADDR
:
4563 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
4566 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
4569 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
4571 case SCTP_ASSOCINFO
:
4572 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
4574 case SCTP_I_WANT_MAPPED_V4_ADDR
:
4575 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
4578 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
4580 case SCTP_GET_PEER_ADDR_INFO
:
4581 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
4584 case SCTP_ADAPTION_LAYER
:
4585 retval
= sctp_getsockopt_adaption_layer(sk
, len
, optval
,
4589 retval
= -ENOPROTOOPT
;
4593 sctp_release_sock(sk
);
4597 static void sctp_hash(struct sock
*sk
)
4602 static void sctp_unhash(struct sock
*sk
)
4607 /* Check if port is acceptable. Possibly find first available port.
4609 * The port hash table (contained in the 'global' SCTP protocol storage
4610 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
4611 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
4612 * list (the list number is the port number hashed out, so as you
4613 * would expect from a hash function, all the ports in a given list have
4614 * such a number that hashes out to the same list number; you were
4615 * expecting that, right?); so each list has a set of ports, with a
4616 * link to the socket (struct sock) that uses it, the port number and
4617 * a fastreuse flag (FIXME: NPI ipg).
4619 static struct sctp_bind_bucket
*sctp_bucket_create(
4620 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
4622 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
4624 struct sctp_bind_hashbucket
*head
; /* hash list */
4625 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
4626 unsigned short snum
;
4629 snum
= ntohs(addr
->v4
.sin_port
);
4631 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
4632 sctp_local_bh_disable();
4635 /* Search for an available port.
4637 * 'sctp_port_rover' was the last port assigned, so
4638 * we start to search from 'sctp_port_rover +
4639 * 1'. What we do is first check if port 'rover' is
4640 * already in the hash table; if not, we use that; if
4641 * it is, we try next.
4643 int low
= sysctl_local_port_range
[0];
4644 int high
= sysctl_local_port_range
[1];
4645 int remaining
= (high
- low
) + 1;
4649 sctp_spin_lock(&sctp_port_alloc_lock
);
4650 rover
= sctp_port_rover
;
4653 if ((rover
< low
) || (rover
> high
))
4655 index
= sctp_phashfn(rover
);
4656 head
= &sctp_port_hashtable
[index
];
4657 sctp_spin_lock(&head
->lock
);
4658 for (pp
= head
->chain
; pp
; pp
= pp
->next
)
4659 if (pp
->port
== rover
)
4663 sctp_spin_unlock(&head
->lock
);
4664 } while (--remaining
> 0);
4665 sctp_port_rover
= rover
;
4666 sctp_spin_unlock(&sctp_port_alloc_lock
);
4668 /* Exhausted local port range during search? */
4673 /* OK, here is the one we will use. HEAD (the port
4674 * hash table list entry) is non-NULL and we hold it's
4679 /* We are given an specific port number; we verify
4680 * that it is not being used. If it is used, we will
4681 * exahust the search in the hash list corresponding
4682 * to the port number (snum) - we detect that with the
4683 * port iterator, pp being NULL.
4685 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
4686 sctp_spin_lock(&head
->lock
);
4687 for (pp
= head
->chain
; pp
; pp
= pp
->next
) {
4688 if (pp
->port
== snum
)
4695 if (!hlist_empty(&pp
->owner
)) {
4696 /* We had a port hash table hit - there is an
4697 * available port (pp != NULL) and it is being
4698 * used by other socket (pp->owner not empty); that other
4699 * socket is going to be sk2.
4701 int reuse
= sk
->sk_reuse
;
4703 struct hlist_node
*node
;
4705 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
4706 if (pp
->fastreuse
&& sk
->sk_reuse
)
4709 /* Run through the list of sockets bound to the port
4710 * (pp->port) [via the pointers bind_next and
4711 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
4712 * we get the endpoint they describe and run through
4713 * the endpoint's list of IP (v4 or v6) addresses,
4714 * comparing each of the addresses with the address of
4715 * the socket sk. If we find a match, then that means
4716 * that this port/socket (sk) combination are already
4719 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
4720 struct sctp_endpoint
*ep2
;
4721 ep2
= sctp_sk(sk2
)->ep
;
4723 if (reuse
&& sk2
->sk_reuse
)
4726 if (sctp_bind_addr_match(&ep2
->base
.bind_addr
, addr
,
4732 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
4735 /* If there was a hash table miss, create a new port. */
4737 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
4740 /* In either case (hit or miss), make sure fastreuse is 1 only
4741 * if sk->sk_reuse is too (that is, if the caller requested
4742 * SO_REUSEADDR on this socket -sk-).
4744 if (hlist_empty(&pp
->owner
))
4745 pp
->fastreuse
= sk
->sk_reuse
? 1 : 0;
4746 else if (pp
->fastreuse
&& !sk
->sk_reuse
)
4749 /* We are set, so fill up all the data in the hash table
4750 * entry, tie the socket list information with the rest of the
4751 * sockets FIXME: Blurry, NPI (ipg).
4754 inet_sk(sk
)->num
= snum
;
4755 if (!sctp_sk(sk
)->bind_hash
) {
4756 sk_add_bind_node(sk
, &pp
->owner
);
4757 sctp_sk(sk
)->bind_hash
= pp
;
4762 sctp_spin_unlock(&head
->lock
);
4765 sctp_local_bh_enable();
4769 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
4770 * port is requested.
4772 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
4775 union sctp_addr addr
;
4776 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
4778 /* Set up a dummy address struct from the sk. */
4779 af
->from_sk(&addr
, sk
);
4780 addr
.v4
.sin_port
= htons(snum
);
4782 /* Note: sk->sk_num gets filled in if ephemeral port request. */
4783 ret
= sctp_get_port_local(sk
, &addr
);
4785 return (ret
? 1 : 0);
4789 * 3.1.3 listen() - UDP Style Syntax
4791 * By default, new associations are not accepted for UDP style sockets.
4792 * An application uses listen() to mark a socket as being able to
4793 * accept new associations.
4795 SCTP_STATIC
int sctp_seqpacket_listen(struct sock
*sk
, int backlog
)
4797 struct sctp_sock
*sp
= sctp_sk(sk
);
4798 struct sctp_endpoint
*ep
= sp
->ep
;
4800 /* Only UDP style sockets that are not peeled off are allowed to
4803 if (!sctp_style(sk
, UDP
))
4806 /* If backlog is zero, disable listening. */
4808 if (sctp_sstate(sk
, CLOSED
))
4811 sctp_unhash_endpoint(ep
);
4812 sk
->sk_state
= SCTP_SS_CLOSED
;
4815 /* Return if we are already listening. */
4816 if (sctp_sstate(sk
, LISTENING
))
4820 * If a bind() or sctp_bindx() is not called prior to a listen()
4821 * call that allows new associations to be accepted, the system
4822 * picks an ephemeral port and will choose an address set equivalent
4823 * to binding with a wildcard address.
4825 * This is not currently spelled out in the SCTP sockets
4826 * extensions draft, but follows the practice as seen in TCP
4829 if (!ep
->base
.bind_addr
.port
) {
4830 if (sctp_autobind(sk
))
4833 sk
->sk_state
= SCTP_SS_LISTENING
;
4834 sctp_hash_endpoint(ep
);
4839 * 4.1.3 listen() - TCP Style Syntax
4841 * Applications uses listen() to ready the SCTP endpoint for accepting
4842 * inbound associations.
4844 SCTP_STATIC
int sctp_stream_listen(struct sock
*sk
, int backlog
)
4846 struct sctp_sock
*sp
= sctp_sk(sk
);
4847 struct sctp_endpoint
*ep
= sp
->ep
;
4849 /* If backlog is zero, disable listening. */
4851 if (sctp_sstate(sk
, CLOSED
))
4854 sctp_unhash_endpoint(ep
);
4855 sk
->sk_state
= SCTP_SS_CLOSED
;
4858 if (sctp_sstate(sk
, LISTENING
))
4862 * If a bind() or sctp_bindx() is not called prior to a listen()
4863 * call that allows new associations to be accepted, the system
4864 * picks an ephemeral port and will choose an address set equivalent
4865 * to binding with a wildcard address.
4867 * This is not currently spelled out in the SCTP sockets
4868 * extensions draft, but follows the practice as seen in TCP
4871 if (!ep
->base
.bind_addr
.port
) {
4872 if (sctp_autobind(sk
))
4875 sk
->sk_state
= SCTP_SS_LISTENING
;
4876 sk
->sk_max_ack_backlog
= backlog
;
4877 sctp_hash_endpoint(ep
);
4882 * Move a socket to LISTENING state.
4884 int sctp_inet_listen(struct socket
*sock
, int backlog
)
4886 struct sock
*sk
= sock
->sk
;
4887 struct crypto_hash
*tfm
= NULL
;
4890 if (unlikely(backlog
< 0))
4895 if (sock
->state
!= SS_UNCONNECTED
)
4898 /* Allocate HMAC for generating cookie. */
4899 if (sctp_hmac_alg
) {
4900 tfm
= crypto_alloc_hash(sctp_hmac_alg
, 0, CRYPTO_ALG_ASYNC
);
4907 switch (sock
->type
) {
4908 case SOCK_SEQPACKET
:
4909 err
= sctp_seqpacket_listen(sk
, backlog
);
4912 err
= sctp_stream_listen(sk
, backlog
);
4920 /* Store away the transform reference. */
4921 sctp_sk(sk
)->hmac
= tfm
;
4923 sctp_release_sock(sk
);
4926 crypto_free_hash(tfm
);
4931 * This function is done by modeling the current datagram_poll() and the
4932 * tcp_poll(). Note that, based on these implementations, we don't
4933 * lock the socket in this function, even though it seems that,
4934 * ideally, locking or some other mechanisms can be used to ensure
4935 * the integrity of the counters (sndbuf and wmem_alloc) used
4936 * in this place. We assume that we don't need locks either until proven
4939 * Another thing to note is that we include the Async I/O support
4940 * here, again, by modeling the current TCP/UDP code. We don't have
4941 * a good way to test with it yet.
4943 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
4945 struct sock
*sk
= sock
->sk
;
4946 struct sctp_sock
*sp
= sctp_sk(sk
);
4949 poll_wait(file
, sk
->sk_sleep
, wait
);
4951 /* A TCP-style listening socket becomes readable when the accept queue
4954 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
4955 return (!list_empty(&sp
->ep
->asocs
)) ?
4956 (POLLIN
| POLLRDNORM
) : 0;
4960 /* Is there any exceptional events? */
4961 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
4963 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
4965 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
4968 /* Is it readable? Reconsider this code with TCP-style support. */
4969 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
4970 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
4971 mask
|= POLLIN
| POLLRDNORM
;
4973 /* The association is either gone or not ready. */
4974 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
4977 /* Is it writable? */
4978 if (sctp_writeable(sk
)) {
4979 mask
|= POLLOUT
| POLLWRNORM
;
4981 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
4983 * Since the socket is not locked, the buffer
4984 * might be made available after the writeable check and
4985 * before the bit is set. This could cause a lost I/O
4986 * signal. tcp_poll() has a race breaker for this race
4987 * condition. Based on their implementation, we put
4988 * in the following code to cover it as well.
4990 if (sctp_writeable(sk
))
4991 mask
|= POLLOUT
| POLLWRNORM
;
4996 /********************************************************************
4997 * 2nd Level Abstractions
4998 ********************************************************************/
5000 static struct sctp_bind_bucket
*sctp_bucket_create(
5001 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
5003 struct sctp_bind_bucket
*pp
;
5005 pp
= kmem_cache_alloc(sctp_bucket_cachep
, SLAB_ATOMIC
);
5006 SCTP_DBG_OBJCNT_INC(bind_bucket
);
5010 INIT_HLIST_HEAD(&pp
->owner
);
5011 if ((pp
->next
= head
->chain
) != NULL
)
5012 pp
->next
->pprev
= &pp
->next
;
5014 pp
->pprev
= &head
->chain
;
5019 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5020 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
5022 if (pp
&& hlist_empty(&pp
->owner
)) {
5024 pp
->next
->pprev
= pp
->pprev
;
5025 *(pp
->pprev
) = pp
->next
;
5026 kmem_cache_free(sctp_bucket_cachep
, pp
);
5027 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
5031 /* Release this socket's reference to a local port. */
5032 static inline void __sctp_put_port(struct sock
*sk
)
5034 struct sctp_bind_hashbucket
*head
=
5035 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->num
)];
5036 struct sctp_bind_bucket
*pp
;
5038 sctp_spin_lock(&head
->lock
);
5039 pp
= sctp_sk(sk
)->bind_hash
;
5040 __sk_del_bind_node(sk
);
5041 sctp_sk(sk
)->bind_hash
= NULL
;
5042 inet_sk(sk
)->num
= 0;
5043 sctp_bucket_destroy(pp
);
5044 sctp_spin_unlock(&head
->lock
);
5047 void sctp_put_port(struct sock
*sk
)
5049 sctp_local_bh_disable();
5050 __sctp_put_port(sk
);
5051 sctp_local_bh_enable();
5055 * The system picks an ephemeral port and choose an address set equivalent
5056 * to binding with a wildcard address.
5057 * One of those addresses will be the primary address for the association.
5058 * This automatically enables the multihoming capability of SCTP.
5060 static int sctp_autobind(struct sock
*sk
)
5062 union sctp_addr autoaddr
;
5064 unsigned short port
;
5066 /* Initialize a local sockaddr structure to INADDR_ANY. */
5067 af
= sctp_sk(sk
)->pf
->af
;
5069 port
= htons(inet_sk(sk
)->num
);
5070 af
->inaddr_any(&autoaddr
, port
);
5072 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5075 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5078 * 4.2 The cmsghdr Structure *
5080 * When ancillary data is sent or received, any number of ancillary data
5081 * objects can be specified by the msg_control and msg_controllen members of
5082 * the msghdr structure, because each object is preceded by
5083 * a cmsghdr structure defining the object's length (the cmsg_len member).
5084 * Historically Berkeley-derived implementations have passed only one object
5085 * at a time, but this API allows multiple objects to be
5086 * passed in a single call to sendmsg() or recvmsg(). The following example
5087 * shows two ancillary data objects in a control buffer.
5089 * |<--------------------------- msg_controllen -------------------------->|
5092 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5094 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5097 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5099 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5102 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5103 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5105 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5107 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5114 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
5115 sctp_cmsgs_t
*cmsgs
)
5117 struct cmsghdr
*cmsg
;
5119 for (cmsg
= CMSG_FIRSTHDR(msg
);
5121 cmsg
= CMSG_NXTHDR((struct msghdr
*)msg
, cmsg
)) {
5122 if (!CMSG_OK(msg
, cmsg
))
5125 /* Should we parse this header or ignore? */
5126 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
5129 /* Strictly check lengths following example in SCM code. */
5130 switch (cmsg
->cmsg_type
) {
5132 /* SCTP Socket API Extension
5133 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5135 * This cmsghdr structure provides information for
5136 * initializing new SCTP associations with sendmsg().
5137 * The SCTP_INITMSG socket option uses this same data
5138 * structure. This structure is not used for
5141 * cmsg_level cmsg_type cmsg_data[]
5142 * ------------ ------------ ----------------------
5143 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5145 if (cmsg
->cmsg_len
!=
5146 CMSG_LEN(sizeof(struct sctp_initmsg
)))
5148 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
5152 /* SCTP Socket API Extension
5153 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5155 * This cmsghdr structure specifies SCTP options for
5156 * sendmsg() and describes SCTP header information
5157 * about a received message through recvmsg().
5159 * cmsg_level cmsg_type cmsg_data[]
5160 * ------------ ------------ ----------------------
5161 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5163 if (cmsg
->cmsg_len
!=
5164 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
5168 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
5170 /* Minimally, validate the sinfo_flags. */
5171 if (cmsgs
->info
->sinfo_flags
&
5172 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
5173 SCTP_ABORT
| SCTP_EOF
))
5185 * Wait for a packet..
5186 * Note: This function is the same function as in core/datagram.c
5187 * with a few modifications to make lksctp work.
5189 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
5194 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5196 /* Socket errors? */
5197 error
= sock_error(sk
);
5201 if (!skb_queue_empty(&sk
->sk_receive_queue
))
5204 /* Socket shut down? */
5205 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5208 /* Sequenced packets can come disconnected. If so we report the
5213 /* Is there a good reason to think that we may receive some data? */
5214 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
5217 /* Handle signals. */
5218 if (signal_pending(current
))
5221 /* Let another process have a go. Since we are going to sleep
5222 * anyway. Note: This may cause odd behaviors if the message
5223 * does not fit in the user's buffer, but this seems to be the
5224 * only way to honor MSG_DONTWAIT realistically.
5226 sctp_release_sock(sk
);
5227 *timeo_p
= schedule_timeout(*timeo_p
);
5231 finish_wait(sk
->sk_sleep
, &wait
);
5235 error
= sock_intr_errno(*timeo_p
);
5238 finish_wait(sk
->sk_sleep
, &wait
);
5243 /* Receive a datagram.
5244 * Note: This is pretty much the same routine as in core/datagram.c
5245 * with a few changes to make lksctp work.
5247 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
5248 int noblock
, int *err
)
5251 struct sk_buff
*skb
;
5254 timeo
= sock_rcvtimeo(sk
, noblock
);
5256 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
5257 timeo
, MAX_SCHEDULE_TIMEOUT
);
5260 /* Again only user level code calls this function,
5261 * so nothing interrupt level
5262 * will suddenly eat the receive_queue.
5264 * Look at current nfs client by the way...
5265 * However, this function was corrent in any case. 8)
5267 if (flags
& MSG_PEEK
) {
5268 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
5269 skb
= skb_peek(&sk
->sk_receive_queue
);
5271 atomic_inc(&skb
->users
);
5272 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
5274 skb
= skb_dequeue(&sk
->sk_receive_queue
);
5280 /* Caller is allowed not to check sk->sk_err before calling. */
5281 error
= sock_error(sk
);
5285 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5288 /* User doesn't want to wait. */
5292 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
5301 /* If sndbuf has changed, wake up per association sndbuf waiters. */
5302 static void __sctp_write_space(struct sctp_association
*asoc
)
5304 struct sock
*sk
= asoc
->base
.sk
;
5305 struct socket
*sock
= sk
->sk_socket
;
5307 if ((sctp_wspace(asoc
) > 0) && sock
) {
5308 if (waitqueue_active(&asoc
->wait
))
5309 wake_up_interruptible(&asoc
->wait
);
5311 if (sctp_writeable(sk
)) {
5312 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
5313 wake_up_interruptible(sk
->sk_sleep
);
5315 /* Note that we try to include the Async I/O support
5316 * here by modeling from the current TCP/UDP code.
5317 * We have not tested with it yet.
5319 if (sock
->fasync_list
&&
5320 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
5321 sock_wake_async(sock
, 2, POLL_OUT
);
5326 /* Do accounting for the sndbuf space.
5327 * Decrement the used sndbuf space of the corresponding association by the
5328 * data size which was just transmitted(freed).
5330 static void sctp_wfree(struct sk_buff
*skb
)
5332 struct sctp_association
*asoc
;
5333 struct sctp_chunk
*chunk
;
5336 /* Get the saved chunk pointer. */
5337 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
5340 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
5341 sizeof(struct sk_buff
) +
5342 sizeof(struct sctp_chunk
);
5344 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
5347 __sctp_write_space(asoc
);
5349 sctp_association_put(asoc
);
5352 /* Do accounting for the receive space on the socket.
5353 * Accounting for the association is done in ulpevent.c
5354 * We set this as a destructor for the cloned data skbs so that
5355 * accounting is done at the correct time.
5357 void sctp_sock_rfree(struct sk_buff
*skb
)
5359 struct sock
*sk
= skb
->sk
;
5360 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
5362 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
5366 /* Helper function to wait for space in the sndbuf. */
5367 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
5370 struct sock
*sk
= asoc
->base
.sk
;
5372 long current_timeo
= *timeo_p
;
5375 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
5376 asoc
, (long)(*timeo_p
), msg_len
);
5378 /* Increment the association's refcnt. */
5379 sctp_association_hold(asoc
);
5381 /* Wait on the association specific sndbuf space. */
5383 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
5384 TASK_INTERRUPTIBLE
);
5387 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
5390 if (signal_pending(current
))
5391 goto do_interrupted
;
5392 if (msg_len
<= sctp_wspace(asoc
))
5395 /* Let another process have a go. Since we are going
5398 sctp_release_sock(sk
);
5399 current_timeo
= schedule_timeout(current_timeo
);
5400 BUG_ON(sk
!= asoc
->base
.sk
);
5403 *timeo_p
= current_timeo
;
5407 finish_wait(&asoc
->wait
, &wait
);
5409 /* Release the association's refcnt. */
5410 sctp_association_put(asoc
);
5419 err
= sock_intr_errno(*timeo_p
);
5427 /* If socket sndbuf has changed, wake up all per association waiters. */
5428 void sctp_write_space(struct sock
*sk
)
5430 struct sctp_association
*asoc
;
5431 struct list_head
*pos
;
5433 /* Wake up the tasks in each wait queue. */
5434 list_for_each(pos
, &((sctp_sk(sk
))->ep
->asocs
)) {
5435 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
5436 __sctp_write_space(asoc
);
5440 /* Is there any sndbuf space available on the socket?
5442 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
5443 * associations on the same socket. For a UDP-style socket with
5444 * multiple associations, it is possible for it to be "unwriteable"
5445 * prematurely. I assume that this is acceptable because
5446 * a premature "unwriteable" is better than an accidental "writeable" which
5447 * would cause an unwanted block under certain circumstances. For the 1-1
5448 * UDP-style sockets or TCP-style sockets, this code should work.
5451 static int sctp_writeable(struct sock
*sk
)
5455 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
5461 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
5462 * returns immediately with EINPROGRESS.
5464 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
5466 struct sock
*sk
= asoc
->base
.sk
;
5468 long current_timeo
= *timeo_p
;
5471 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __FUNCTION__
, asoc
,
5474 /* Increment the association's refcnt. */
5475 sctp_association_hold(asoc
);
5478 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
5479 TASK_INTERRUPTIBLE
);
5482 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5484 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
5487 if (signal_pending(current
))
5488 goto do_interrupted
;
5490 if (sctp_state(asoc
, ESTABLISHED
))
5493 /* Let another process have a go. Since we are going
5496 sctp_release_sock(sk
);
5497 current_timeo
= schedule_timeout(current_timeo
);
5500 *timeo_p
= current_timeo
;
5504 finish_wait(&asoc
->wait
, &wait
);
5506 /* Release the association's refcnt. */
5507 sctp_association_put(asoc
);
5512 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
5515 err
= -ECONNREFUSED
;
5519 err
= sock_intr_errno(*timeo_p
);
5527 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
5529 struct sctp_endpoint
*ep
;
5533 ep
= sctp_sk(sk
)->ep
;
5537 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
,
5538 TASK_INTERRUPTIBLE
);
5540 if (list_empty(&ep
->asocs
)) {
5541 sctp_release_sock(sk
);
5542 timeo
= schedule_timeout(timeo
);
5547 if (!sctp_sstate(sk
, LISTENING
))
5551 if (!list_empty(&ep
->asocs
))
5554 err
= sock_intr_errno(timeo
);
5555 if (signal_pending(current
))
5563 finish_wait(sk
->sk_sleep
, &wait
);
5568 void sctp_wait_for_close(struct sock
*sk
, long timeout
)
5573 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5574 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
5576 sctp_release_sock(sk
);
5577 timeout
= schedule_timeout(timeout
);
5579 } while (!signal_pending(current
) && timeout
);
5581 finish_wait(sk
->sk_sleep
, &wait
);
5584 /* Populate the fields of the newsk from the oldsk and migrate the assoc
5585 * and its messages to the newsk.
5587 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
5588 struct sctp_association
*assoc
,
5589 sctp_socket_type_t type
)
5591 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
5592 struct sctp_sock
*newsp
= sctp_sk(newsk
);
5593 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5594 struct sctp_endpoint
*newep
= newsp
->ep
;
5595 struct sk_buff
*skb
, *tmp
;
5596 struct sctp_ulpevent
*event
;
5599 /* Migrate socket buffer sizes and all the socket level options to the
5602 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
5603 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
5604 /* Brute force copy old sctp opt. */
5605 inet_sk_copy_descendant(newsk
, oldsk
);
5607 /* Restore the ep value that was overwritten with the above structure
5613 /* Hook this new socket in to the bind_hash list. */
5614 pp
= sctp_sk(oldsk
)->bind_hash
;
5615 sk_add_bind_node(newsk
, &pp
->owner
);
5616 sctp_sk(newsk
)->bind_hash
= pp
;
5617 inet_sk(newsk
)->num
= inet_sk(oldsk
)->num
;
5619 /* Copy the bind_addr list from the original endpoint to the new
5620 * endpoint so that we can handle restarts properly
5622 if (PF_INET6
== assoc
->base
.sk
->sk_family
)
5623 flags
= SCTP_ADDR6_ALLOWED
;
5624 if (assoc
->peer
.ipv4_address
)
5625 flags
|= SCTP_ADDR4_PEERSUPP
;
5626 if (assoc
->peer
.ipv6_address
)
5627 flags
|= SCTP_ADDR6_PEERSUPP
;
5628 sctp_bind_addr_copy(&newsp
->ep
->base
.bind_addr
,
5629 &oldsp
->ep
->base
.bind_addr
,
5630 SCTP_SCOPE_GLOBAL
, GFP_KERNEL
, flags
);
5632 /* Move any messages in the old socket's receive queue that are for the
5633 * peeled off association to the new socket's receive queue.
5635 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
5636 event
= sctp_skb2event(skb
);
5637 if (event
->asoc
== assoc
) {
5638 sctp_sock_rfree(skb
);
5639 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
5640 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
5641 sctp_skb_set_owner_r(skb
, newsk
);
5645 /* Clean up any messages pending delivery due to partial
5646 * delivery. Three cases:
5647 * 1) No partial deliver; no work.
5648 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
5649 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
5651 skb_queue_head_init(&newsp
->pd_lobby
);
5652 sctp_sk(newsk
)->pd_mode
= assoc
->ulpq
.pd_mode
;
5654 if (sctp_sk(oldsk
)->pd_mode
) {
5655 struct sk_buff_head
*queue
;
5657 /* Decide which queue to move pd_lobby skbs to. */
5658 if (assoc
->ulpq
.pd_mode
) {
5659 queue
= &newsp
->pd_lobby
;
5661 queue
= &newsk
->sk_receive_queue
;
5663 /* Walk through the pd_lobby, looking for skbs that
5664 * need moved to the new socket.
5666 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
5667 event
= sctp_skb2event(skb
);
5668 if (event
->asoc
== assoc
) {
5669 sctp_sock_rfree(skb
);
5670 __skb_unlink(skb
, &oldsp
->pd_lobby
);
5671 __skb_queue_tail(queue
, skb
);
5672 sctp_skb_set_owner_r(skb
, newsk
);
5676 /* Clear up any skbs waiting for the partial
5677 * delivery to finish.
5679 if (assoc
->ulpq
.pd_mode
)
5680 sctp_clear_pd(oldsk
);
5684 /* Set the type of socket to indicate that it is peeled off from the
5685 * original UDP-style socket or created with the accept() call on a
5686 * TCP-style socket..
5690 /* Mark the new socket "in-use" by the user so that any packets
5691 * that may arrive on the association after we've moved it are
5692 * queued to the backlog. This prevents a potential race between
5693 * backlog processing on the old socket and new-packet processing
5694 * on the new socket.
5696 sctp_lock_sock(newsk
);
5697 sctp_assoc_migrate(assoc
, newsk
);
5699 /* If the association on the newsk is already closed before accept()
5700 * is called, set RCV_SHUTDOWN flag.
5702 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
5703 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
5705 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
5706 sctp_release_sock(newsk
);
5709 /* This proto struct describes the ULP interface for SCTP. */
5710 struct proto sctp_prot
= {
5712 .owner
= THIS_MODULE
,
5713 .close
= sctp_close
,
5714 .connect
= sctp_connect
,
5715 .disconnect
= sctp_disconnect
,
5716 .accept
= sctp_accept
,
5717 .ioctl
= sctp_ioctl
,
5718 .init
= sctp_init_sock
,
5719 .destroy
= sctp_destroy_sock
,
5720 .shutdown
= sctp_shutdown
,
5721 .setsockopt
= sctp_setsockopt
,
5722 .getsockopt
= sctp_getsockopt
,
5723 .sendmsg
= sctp_sendmsg
,
5724 .recvmsg
= sctp_recvmsg
,
5726 .backlog_rcv
= sctp_backlog_rcv
,
5728 .unhash
= sctp_unhash
,
5729 .get_port
= sctp_get_port
,
5730 .obj_size
= sizeof(struct sctp_sock
),
5733 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5734 struct proto sctpv6_prot
= {
5736 .owner
= THIS_MODULE
,
5737 .close
= sctp_close
,
5738 .connect
= sctp_connect
,
5739 .disconnect
= sctp_disconnect
,
5740 .accept
= sctp_accept
,
5741 .ioctl
= sctp_ioctl
,
5742 .init
= sctp_init_sock
,
5743 .destroy
= sctp_destroy_sock
,
5744 .shutdown
= sctp_shutdown
,
5745 .setsockopt
= sctp_setsockopt
,
5746 .getsockopt
= sctp_getsockopt
,
5747 .sendmsg
= sctp_sendmsg
,
5748 .recvmsg
= sctp_recvmsg
,
5750 .backlog_rcv
= sctp_backlog_rcv
,
5752 .unhash
= sctp_unhash
,
5753 .get_port
= sctp_get_port
,
5754 .obj_size
= sizeof(struct sctp6_sock
),
5756 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */