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 struct kmem_cache
*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
, 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
);
631 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
632 retval
= -EADDRNOTAVAIL
;
636 if (sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
641 /* FIXME - There is probably a need to check if sk->sk_saddr and
642 * sk->sk_rcv_addr are currently set to one of the addresses to
643 * be removed. This is something which needs to be looked into
644 * when we are fixing the outstanding issues with multi-homing
645 * socket routing and failover schemes. Refer to comments in
646 * sctp_do_bind(). -daisy
648 sctp_local_bh_disable();
649 sctp_write_lock(&ep
->base
.addr_lock
);
651 retval
= sctp_del_bind_addr(bp
, sa_addr
);
653 sctp_write_unlock(&ep
->base
.addr_lock
);
654 sctp_local_bh_enable();
656 addr_buf
+= af
->sockaddr_len
;
659 /* Failed. Add the ones that has been removed back */
661 sctp_bindx_add(sk
, addrs
, cnt
);
669 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
670 * the associations that are part of the endpoint indicating that a list of
671 * local addresses are removed from the endpoint.
673 * If any of the addresses is already in the bind address list of the
674 * association, we do not send the chunk for that association. But it will not
675 * affect other associations.
677 * Only sctp_setsockopt_bindx() is supposed to call this function.
679 static int sctp_send_asconf_del_ip(struct sock
*sk
,
680 struct sockaddr
*addrs
,
683 struct sctp_sock
*sp
;
684 struct sctp_endpoint
*ep
;
685 struct sctp_association
*asoc
;
686 struct sctp_transport
*transport
;
687 struct sctp_bind_addr
*bp
;
688 struct sctp_chunk
*chunk
;
689 union sctp_addr
*laddr
;
692 struct list_head
*pos
, *pos1
;
693 struct sctp_sockaddr_entry
*saddr
;
697 if (!sctp_addip_enable
)
703 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
704 __FUNCTION__
, sk
, addrs
, addrcnt
);
706 list_for_each(pos
, &ep
->asocs
) {
707 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
709 if (!asoc
->peer
.asconf_capable
)
712 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
715 if (!sctp_state(asoc
, ESTABLISHED
))
718 /* Check if any address in the packed array of addresses is
719 * not present in the bind address list of the association.
720 * If so, do not send the asconf chunk to its peer, but
721 * continue with other associations.
724 for (i
= 0; i
< addrcnt
; i
++) {
725 laddr
= (union sctp_addr
*)addr_buf
;
726 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
732 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
735 addr_buf
+= af
->sockaddr_len
;
740 /* Find one address in the association's bind address list
741 * that is not in the packed array of addresses. This is to
742 * make sure that we do not delete all the addresses in the
745 sctp_read_lock(&asoc
->base
.addr_lock
);
746 bp
= &asoc
->base
.bind_addr
;
747 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
749 sctp_read_unlock(&asoc
->base
.addr_lock
);
753 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
760 /* Reset use_as_src flag for the addresses in the bind address
761 * list that are to be deleted.
763 sctp_local_bh_disable();
764 sctp_write_lock(&asoc
->base
.addr_lock
);
766 for (i
= 0; i
< addrcnt
; i
++) {
767 laddr
= (union sctp_addr
*)addr_buf
;
768 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
769 list_for_each(pos1
, &bp
->address_list
) {
770 saddr
= list_entry(pos1
,
771 struct sctp_sockaddr_entry
,
773 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
774 saddr
->use_as_src
= 0;
776 addr_buf
+= af
->sockaddr_len
;
778 sctp_write_unlock(&asoc
->base
.addr_lock
);
779 sctp_local_bh_enable();
781 /* Update the route and saddr entries for all the transports
782 * as some of the addresses in the bind address list are
783 * about to be deleted and cannot be used as source addresses.
785 list_for_each(pos1
, &asoc
->peer
.transport_addr_list
) {
786 transport
= list_entry(pos1
, struct sctp_transport
,
788 dst_release(transport
->dst
);
789 sctp_transport_route(transport
, NULL
,
790 sctp_sk(asoc
->base
.sk
));
793 retval
= sctp_send_asconf(asoc
, chunk
);
799 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
802 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
805 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
806 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
809 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
810 * Section 3.1.2 for this usage.
812 * addrs is a pointer to an array of one or more socket addresses. Each
813 * address is contained in its appropriate structure (i.e. struct
814 * sockaddr_in or struct sockaddr_in6) the family of the address type
815 * must be used to distinguish the address length (note that this
816 * representation is termed a "packed array" of addresses). The caller
817 * specifies the number of addresses in the array with addrcnt.
819 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
820 * -1, and sets errno to the appropriate error code.
822 * For SCTP, the port given in each socket address must be the same, or
823 * sctp_bindx() will fail, setting errno to EINVAL.
825 * The flags parameter is formed from the bitwise OR of zero or more of
826 * the following currently defined flags:
828 * SCTP_BINDX_ADD_ADDR
830 * SCTP_BINDX_REM_ADDR
832 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
833 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
834 * addresses from the association. The two flags are mutually exclusive;
835 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
836 * not remove all addresses from an association; sctp_bindx() will
837 * reject such an attempt with EINVAL.
839 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
840 * additional addresses with an endpoint after calling bind(). Or use
841 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
842 * socket is associated with so that no new association accepted will be
843 * associated with those addresses. If the endpoint supports dynamic
844 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
845 * endpoint to send the appropriate message to the peer to change the
846 * peers address lists.
848 * Adding and removing addresses from a connected association is
849 * optional functionality. Implementations that do not support this
850 * functionality should return EOPNOTSUPP.
852 * Basically do nothing but copying the addresses from user to kernel
853 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
854 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
857 * We don't use copy_from_user() for optimization: we first do the
858 * sanity checks (buffer size -fast- and access check-healthy
859 * pointer); if all of those succeed, then we can alloc the memory
860 * (expensive operation) needed to copy the data to kernel. Then we do
861 * the copying without checking the user space area
862 * (__copy_from_user()).
864 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
867 * sk The sk of the socket
868 * addrs The pointer to the addresses in user land
869 * addrssize Size of the addrs buffer
870 * op Operation to perform (add or remove, see the flags of
873 * Returns 0 if ok, <0 errno code on error.
875 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
876 struct sockaddr __user
*addrs
,
877 int addrs_size
, int op
)
879 struct sockaddr
*kaddrs
;
883 struct sockaddr
*sa_addr
;
887 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
888 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
890 if (unlikely(addrs_size
<= 0))
893 /* Check the user passed a healthy pointer. */
894 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
897 /* Alloc space for the address array in kernel memory. */
898 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
899 if (unlikely(!kaddrs
))
902 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
907 /* Walk through the addrs buffer and count the number of addresses. */
909 while (walk_size
< addrs_size
) {
910 sa_addr
= (struct sockaddr
*)addr_buf
;
911 af
= sctp_get_af_specific(sa_addr
->sa_family
);
913 /* If the address family is not supported or if this address
914 * causes the address buffer to overflow return EINVAL.
916 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
921 addr_buf
+= af
->sockaddr_len
;
922 walk_size
+= af
->sockaddr_len
;
927 case SCTP_BINDX_ADD_ADDR
:
928 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
931 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
934 case SCTP_BINDX_REM_ADDR
:
935 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
938 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
952 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
954 * Common routine for handling connect() and sctp_connectx().
955 * Connect will come in with just a single address.
957 static int __sctp_connect(struct sock
* sk
,
958 struct sockaddr
*kaddrs
,
961 struct sctp_sock
*sp
;
962 struct sctp_endpoint
*ep
;
963 struct sctp_association
*asoc
= NULL
;
964 struct sctp_association
*asoc2
;
965 struct sctp_transport
*transport
;
973 union sctp_addr
*sa_addr
;
979 /* connect() cannot be done on a socket that is already in ESTABLISHED
980 * state - UDP-style peeled off socket or a TCP-style socket that
981 * is already connected.
982 * It cannot be done even on a TCP-style listening socket.
984 if (sctp_sstate(sk
, ESTABLISHED
) ||
985 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
990 /* Walk through the addrs buffer and count the number of addresses. */
992 while (walk_size
< addrs_size
) {
993 sa_addr
= (union sctp_addr
*)addr_buf
;
994 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
996 /* If the address family is not supported or if this address
997 * causes the address buffer to overflow return EINVAL.
999 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1004 err
= sctp_verify_addr(sk
, sa_addr
, af
->sockaddr_len
);
1008 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1010 /* Check if there already is a matching association on the
1011 * endpoint (other than the one created here).
1013 asoc2
= sctp_endpoint_lookup_assoc(ep
, sa_addr
, &transport
);
1014 if (asoc2
&& asoc2
!= asoc
) {
1015 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1022 /* If we could not find a matching association on the endpoint,
1023 * make sure that there is no peeled-off association matching
1024 * the peer address even on another socket.
1026 if (sctp_endpoint_is_peeled_off(ep
, sa_addr
)) {
1027 err
= -EADDRNOTAVAIL
;
1032 /* If a bind() or sctp_bindx() is not called prior to
1033 * an sctp_connectx() call, the system picks an
1034 * ephemeral port and will choose an address set
1035 * equivalent to binding with a wildcard address.
1037 if (!ep
->base
.bind_addr
.port
) {
1038 if (sctp_autobind(sk
)) {
1044 * If an unprivileged user inherits a 1-many
1045 * style socket with open associations on a
1046 * privileged port, it MAY be permitted to
1047 * accept new associations, but it SHOULD NOT
1048 * be permitted to open new associations.
1050 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1051 !capable(CAP_NET_BIND_SERVICE
)) {
1057 scope
= sctp_scope(sa_addr
);
1058 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1065 /* Prime the peer's transport structures. */
1066 transport
= sctp_assoc_add_peer(asoc
, sa_addr
, GFP_KERNEL
,
1074 addr_buf
+= af
->sockaddr_len
;
1075 walk_size
+= af
->sockaddr_len
;
1078 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1083 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1088 /* Initialize sk's dport and daddr for getpeername() */
1089 inet_sk(sk
)->dport
= htons(asoc
->peer
.port
);
1090 af
= sctp_get_af_specific(to
.sa
.sa_family
);
1091 af
->to_sk_daddr(&to
, sk
);
1094 timeo
= sock_sndtimeo(sk
, sk
->sk_socket
->file
->f_flags
& O_NONBLOCK
);
1095 err
= sctp_wait_for_connect(asoc
, &timeo
);
1097 /* Don't free association on exit. */
1102 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1103 " kaddrs: %p err: %d\n",
1106 sctp_association_free(asoc
);
1110 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1113 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
1115 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1116 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1117 * or IPv6 addresses.
1119 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1120 * Section 3.1.2 for this usage.
1122 * addrs is a pointer to an array of one or more socket addresses. Each
1123 * address is contained in its appropriate structure (i.e. struct
1124 * sockaddr_in or struct sockaddr_in6) the family of the address type
1125 * must be used to distengish the address length (note that this
1126 * representation is termed a "packed array" of addresses). The caller
1127 * specifies the number of addresses in the array with addrcnt.
1129 * On success, sctp_connectx() returns 0. On failure, sctp_connectx() returns
1130 * -1, and sets errno to the appropriate error code.
1132 * For SCTP, the port given in each socket address must be the same, or
1133 * sctp_connectx() will fail, setting errno to EINVAL.
1135 * An application can use sctp_connectx to initiate an association with
1136 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1137 * allows a caller to specify multiple addresses at which a peer can be
1138 * reached. The way the SCTP stack uses the list of addresses to set up
1139 * the association is implementation dependant. This function only
1140 * specifies that the stack will try to make use of all the addresses in
1141 * the list when needed.
1143 * Note that the list of addresses passed in is only used for setting up
1144 * the association. It does not necessarily equal the set of addresses
1145 * the peer uses for the resulting association. If the caller wants to
1146 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1147 * retrieve them after the association has been set up.
1149 * Basically do nothing but copying the addresses from user to kernel
1150 * land and invoking either sctp_connectx(). This is used for tunneling
1151 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1153 * We don't use copy_from_user() for optimization: we first do the
1154 * sanity checks (buffer size -fast- and access check-healthy
1155 * pointer); if all of those succeed, then we can alloc the memory
1156 * (expensive operation) needed to copy the data to kernel. Then we do
1157 * the copying without checking the user space area
1158 * (__copy_from_user()).
1160 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1163 * sk The sk of the socket
1164 * addrs The pointer to the addresses in user land
1165 * addrssize Size of the addrs buffer
1167 * Returns 0 if ok, <0 errno code on error.
1169 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1170 struct sockaddr __user
*addrs
,
1174 struct sockaddr
*kaddrs
;
1176 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1177 __FUNCTION__
, sk
, addrs
, addrs_size
);
1179 if (unlikely(addrs_size
<= 0))
1182 /* Check the user passed a healthy pointer. */
1183 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1186 /* Alloc space for the address array in kernel memory. */
1187 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1188 if (unlikely(!kaddrs
))
1191 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1194 err
= __sctp_connect(sk
, kaddrs
, addrs_size
);
1201 /* API 3.1.4 close() - UDP Style Syntax
1202 * Applications use close() to perform graceful shutdown (as described in
1203 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1204 * by a UDP-style socket.
1208 * ret = close(int sd);
1210 * sd - the socket descriptor of the associations to be closed.
1212 * To gracefully shutdown a specific association represented by the
1213 * UDP-style socket, an application should use the sendmsg() call,
1214 * passing no user data, but including the appropriate flag in the
1215 * ancillary data (see Section xxxx).
1217 * If sd in the close() call is a branched-off socket representing only
1218 * one association, the shutdown is performed on that association only.
1220 * 4.1.6 close() - TCP Style Syntax
1222 * Applications use close() to gracefully close down an association.
1226 * int close(int sd);
1228 * sd - the socket descriptor of the association to be closed.
1230 * After an application calls close() on a socket descriptor, no further
1231 * socket operations will succeed on that descriptor.
1233 * API 7.1.4 SO_LINGER
1235 * An application using the TCP-style socket can use this option to
1236 * perform the SCTP ABORT primitive. The linger option structure is:
1239 * int l_onoff; // option on/off
1240 * int l_linger; // linger time
1243 * To enable the option, set l_onoff to 1. If the l_linger value is set
1244 * to 0, calling close() is the same as the ABORT primitive. If the
1245 * value is set to a negative value, the setsockopt() call will return
1246 * an error. If the value is set to a positive value linger_time, the
1247 * close() can be blocked for at most linger_time ms. If the graceful
1248 * shutdown phase does not finish during this period, close() will
1249 * return but the graceful shutdown phase continues in the system.
1251 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1253 struct sctp_endpoint
*ep
;
1254 struct sctp_association
*asoc
;
1255 struct list_head
*pos
, *temp
;
1257 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1260 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1262 ep
= sctp_sk(sk
)->ep
;
1264 /* Walk all associations on an endpoint. */
1265 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1266 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1268 if (sctp_style(sk
, TCP
)) {
1269 /* A closed association can still be in the list if
1270 * it belongs to a TCP-style listening socket that is
1271 * not yet accepted. If so, free it. If not, send an
1272 * ABORT or SHUTDOWN based on the linger options.
1274 if (sctp_state(asoc
, CLOSED
)) {
1275 sctp_unhash_established(asoc
);
1276 sctp_association_free(asoc
);
1281 if (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
) {
1282 struct sctp_chunk
*chunk
;
1284 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1286 sctp_primitive_ABORT(asoc
, chunk
);
1288 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1291 /* Clean up any skbs sitting on the receive queue. */
1292 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1293 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1295 /* On a TCP-style socket, block for at most linger_time if set. */
1296 if (sctp_style(sk
, TCP
) && timeout
)
1297 sctp_wait_for_close(sk
, timeout
);
1299 /* This will run the backlog queue. */
1300 sctp_release_sock(sk
);
1302 /* Supposedly, no process has access to the socket, but
1303 * the net layers still may.
1305 sctp_local_bh_disable();
1306 sctp_bh_lock_sock(sk
);
1308 /* Hold the sock, since sk_common_release() will put sock_put()
1309 * and we have just a little more cleanup.
1312 sk_common_release(sk
);
1314 sctp_bh_unlock_sock(sk
);
1315 sctp_local_bh_enable();
1319 SCTP_DBG_OBJCNT_DEC(sock
);
1322 /* Handle EPIPE error. */
1323 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1326 err
= sock_error(sk
) ? : -EPIPE
;
1327 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1328 send_sig(SIGPIPE
, current
, 0);
1332 /* API 3.1.3 sendmsg() - UDP Style Syntax
1334 * An application uses sendmsg() and recvmsg() calls to transmit data to
1335 * and receive data from its peer.
1337 * ssize_t sendmsg(int socket, const struct msghdr *message,
1340 * socket - the socket descriptor of the endpoint.
1341 * message - pointer to the msghdr structure which contains a single
1342 * user message and possibly some ancillary data.
1344 * See Section 5 for complete description of the data
1347 * flags - flags sent or received with the user message, see Section
1348 * 5 for complete description of the flags.
1350 * Note: This function could use a rewrite especially when explicit
1351 * connect support comes in.
1353 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1355 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1357 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1358 struct msghdr
*msg
, size_t msg_len
)
1360 struct sctp_sock
*sp
;
1361 struct sctp_endpoint
*ep
;
1362 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1363 struct sctp_transport
*transport
, *chunk_tp
;
1364 struct sctp_chunk
*chunk
;
1366 struct sockaddr
*msg_name
= NULL
;
1367 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1368 struct sctp_sndrcvinfo
*sinfo
;
1369 struct sctp_initmsg
*sinit
;
1370 sctp_assoc_t associd
= 0;
1371 sctp_cmsgs_t cmsgs
= { NULL
};
1375 __u16 sinfo_flags
= 0;
1376 struct sctp_datamsg
*datamsg
;
1377 struct list_head
*pos
;
1378 int msg_flags
= msg
->msg_flags
;
1380 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1387 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1389 /* We cannot send a message over a TCP-style listening socket. */
1390 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1395 /* Parse out the SCTP CMSGs. */
1396 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1399 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1403 /* Fetch the destination address for this packet. This
1404 * address only selects the association--it is not necessarily
1405 * the address we will send to.
1406 * For a peeled-off socket, msg_name is ignored.
1408 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1409 int msg_namelen
= msg
->msg_namelen
;
1411 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1416 if (msg_namelen
> sizeof(to
))
1417 msg_namelen
= sizeof(to
);
1418 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1419 msg_name
= msg
->msg_name
;
1425 /* Did the user specify SNDRCVINFO? */
1427 sinfo_flags
= sinfo
->sinfo_flags
;
1428 associd
= sinfo
->sinfo_assoc_id
;
1431 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1432 msg_len
, sinfo_flags
);
1434 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1435 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1440 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1441 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1442 * If SCTP_ABORT is set, the message length could be non zero with
1443 * the msg_iov set to the user abort reason.
1445 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1446 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1451 /* If SCTP_ADDR_OVER is set, there must be an address
1452 * specified in msg_name.
1454 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1461 SCTP_DEBUG_PRINTK("About to look up association.\n");
1465 /* If a msg_name has been specified, assume this is to be used. */
1467 /* Look for a matching association on the endpoint. */
1468 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1470 /* If we could not find a matching association on the
1471 * endpoint, make sure that it is not a TCP-style
1472 * socket that already has an association or there is
1473 * no peeled-off association on another socket.
1475 if ((sctp_style(sk
, TCP
) &&
1476 sctp_sstate(sk
, ESTABLISHED
)) ||
1477 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1478 err
= -EADDRNOTAVAIL
;
1483 asoc
= sctp_id2assoc(sk
, associd
);
1491 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1493 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1494 * socket that has an association in CLOSED state. This can
1495 * happen when an accepted socket has an association that is
1498 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1503 if (sinfo_flags
& SCTP_EOF
) {
1504 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1506 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1510 if (sinfo_flags
& SCTP_ABORT
) {
1511 struct sctp_chunk
*chunk
;
1513 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1519 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1520 sctp_primitive_ABORT(asoc
, chunk
);
1526 /* Do we need to create the association? */
1528 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1530 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1535 /* Check for invalid stream against the stream counts,
1536 * either the default or the user specified stream counts.
1539 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1540 /* Check against the defaults. */
1541 if (sinfo
->sinfo_stream
>=
1542 sp
->initmsg
.sinit_num_ostreams
) {
1547 /* Check against the requested. */
1548 if (sinfo
->sinfo_stream
>=
1549 sinit
->sinit_num_ostreams
) {
1557 * API 3.1.2 bind() - UDP Style Syntax
1558 * If a bind() or sctp_bindx() is not called prior to a
1559 * sendmsg() call that initiates a new association, the
1560 * system picks an ephemeral port and will choose an address
1561 * set equivalent to binding with a wildcard address.
1563 if (!ep
->base
.bind_addr
.port
) {
1564 if (sctp_autobind(sk
)) {
1570 * If an unprivileged user inherits a one-to-many
1571 * style socket with open associations on a privileged
1572 * port, it MAY be permitted to accept new associations,
1573 * but it SHOULD NOT be permitted to open new
1576 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1577 !capable(CAP_NET_BIND_SERVICE
)) {
1583 scope
= sctp_scope(&to
);
1584 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1591 /* If the SCTP_INIT ancillary data is specified, set all
1592 * the association init values accordingly.
1595 if (sinit
->sinit_num_ostreams
) {
1596 asoc
->c
.sinit_num_ostreams
=
1597 sinit
->sinit_num_ostreams
;
1599 if (sinit
->sinit_max_instreams
) {
1600 asoc
->c
.sinit_max_instreams
=
1601 sinit
->sinit_max_instreams
;
1603 if (sinit
->sinit_max_attempts
) {
1604 asoc
->max_init_attempts
1605 = sinit
->sinit_max_attempts
;
1607 if (sinit
->sinit_max_init_timeo
) {
1608 asoc
->max_init_timeo
=
1609 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1613 /* Prime the peer's transport structures. */
1614 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1619 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1626 /* ASSERT: we have a valid association at this point. */
1627 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1630 /* If the user didn't specify SNDRCVINFO, make up one with
1633 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1634 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1635 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1636 default_sinfo
.sinfo_context
= asoc
->default_context
;
1637 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1638 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1639 sinfo
= &default_sinfo
;
1642 /* API 7.1.7, the sndbuf size per association bounds the
1643 * maximum size of data that can be sent in a single send call.
1645 if (msg_len
> sk
->sk_sndbuf
) {
1650 /* If fragmentation is disabled and the message length exceeds the
1651 * association fragmentation point, return EMSGSIZE. The I-D
1652 * does not specify what this error is, but this looks like
1655 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1661 /* Check for invalid stream. */
1662 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1668 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1669 if (!sctp_wspace(asoc
)) {
1670 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1675 /* If an address is passed with the sendto/sendmsg call, it is used
1676 * to override the primary destination address in the TCP model, or
1677 * when SCTP_ADDR_OVER flag is set in the UDP model.
1679 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1680 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1681 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1689 /* Auto-connect, if we aren't connected already. */
1690 if (sctp_state(asoc
, CLOSED
)) {
1691 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1694 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1697 /* Break the message into multiple chunks of maximum size. */
1698 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1704 /* Now send the (possibly) fragmented message. */
1705 list_for_each(pos
, &datamsg
->chunks
) {
1706 chunk
= list_entry(pos
, struct sctp_chunk
, frag_list
);
1707 sctp_datamsg_track(chunk
);
1709 /* Do accounting for the write space. */
1710 sctp_set_owner_w(chunk
);
1712 chunk
->transport
= chunk_tp
;
1714 /* Send it to the lower layers. Note: all chunks
1715 * must either fail or succeed. The lower layer
1716 * works that way today. Keep it that way or this
1719 err
= sctp_primitive_SEND(asoc
, chunk
);
1720 /* Did the lower layer accept the chunk? */
1722 sctp_chunk_free(chunk
);
1723 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1726 sctp_datamsg_free(datamsg
);
1732 /* If we are already past ASSOCIATE, the lower
1733 * layers are responsible for association cleanup.
1739 sctp_association_free(asoc
);
1741 sctp_release_sock(sk
);
1744 return sctp_error(sk
, msg_flags
, err
);
1751 err
= sock_error(sk
);
1761 /* This is an extended version of skb_pull() that removes the data from the
1762 * start of a skb even when data is spread across the list of skb's in the
1763 * frag_list. len specifies the total amount of data that needs to be removed.
1764 * when 'len' bytes could be removed from the skb, it returns 0.
1765 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1766 * could not be removed.
1768 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1770 struct sk_buff
*list
;
1771 int skb_len
= skb_headlen(skb
);
1774 if (len
<= skb_len
) {
1775 __skb_pull(skb
, len
);
1779 __skb_pull(skb
, skb_len
);
1781 for (list
= skb_shinfo(skb
)->frag_list
; list
; list
= list
->next
) {
1782 rlen
= sctp_skb_pull(list
, len
);
1783 skb
->len
-= (len
-rlen
);
1784 skb
->data_len
-= (len
-rlen
);
1795 /* API 3.1.3 recvmsg() - UDP Style Syntax
1797 * ssize_t recvmsg(int socket, struct msghdr *message,
1800 * socket - the socket descriptor of the endpoint.
1801 * message - pointer to the msghdr structure which contains a single
1802 * user message and possibly some ancillary data.
1804 * See Section 5 for complete description of the data
1807 * flags - flags sent or received with the user message, see Section
1808 * 5 for complete description of the flags.
1810 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1812 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1813 struct msghdr
*msg
, size_t len
, int noblock
,
1814 int flags
, int *addr_len
)
1816 struct sctp_ulpevent
*event
= NULL
;
1817 struct sctp_sock
*sp
= sctp_sk(sk
);
1818 struct sk_buff
*skb
;
1823 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1824 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1825 "len", len
, "knoblauch", noblock
,
1826 "flags", flags
, "addr_len", addr_len
);
1830 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1835 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1839 /* Get the total length of the skb including any skb's in the
1848 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1850 event
= sctp_skb2event(skb
);
1855 sock_recv_timestamp(msg
, sk
, skb
);
1856 if (sctp_ulpevent_is_notification(event
)) {
1857 msg
->msg_flags
|= MSG_NOTIFICATION
;
1858 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1860 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1863 /* Check if we allow SCTP_SNDRCVINFO. */
1864 if (sp
->subscribe
.sctp_data_io_event
)
1865 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1867 /* FIXME: we should be calling IP/IPv6 layers. */
1868 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1869 ip_cmsg_recv(msg
, skb
);
1874 /* If skb's length exceeds the user's buffer, update the skb and
1875 * push it back to the receive_queue so that the next call to
1876 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1878 if (skb_len
> copied
) {
1879 msg
->msg_flags
&= ~MSG_EOR
;
1880 if (flags
& MSG_PEEK
)
1882 sctp_skb_pull(skb
, copied
);
1883 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1885 /* When only partial message is copied to the user, increase
1886 * rwnd by that amount. If all the data in the skb is read,
1887 * rwnd is updated when the event is freed.
1889 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
1891 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
1892 (event
->msg_flags
& MSG_EOR
))
1893 msg
->msg_flags
|= MSG_EOR
;
1895 msg
->msg_flags
&= ~MSG_EOR
;
1898 if (flags
& MSG_PEEK
) {
1899 /* Release the skb reference acquired after peeking the skb in
1900 * sctp_skb_recv_datagram().
1904 /* Free the event which includes releasing the reference to
1905 * the owner of the skb, freeing the skb and updating the
1908 sctp_ulpevent_free(event
);
1911 sctp_release_sock(sk
);
1915 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1917 * This option is a on/off flag. If enabled no SCTP message
1918 * fragmentation will be performed. Instead if a message being sent
1919 * exceeds the current PMTU size, the message will NOT be sent and
1920 * instead a error will be indicated to the user.
1922 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
1923 char __user
*optval
, int optlen
)
1927 if (optlen
< sizeof(int))
1930 if (get_user(val
, (int __user
*)optval
))
1933 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
1938 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
1941 if (optlen
!= sizeof(struct sctp_event_subscribe
))
1943 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
1948 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
1950 * This socket option is applicable to the UDP-style socket only. When
1951 * set it will cause associations that are idle for more than the
1952 * specified number of seconds to automatically close. An association
1953 * being idle is defined an association that has NOT sent or received
1954 * user data. The special value of '0' indicates that no automatic
1955 * close of any associations should be performed. The option expects an
1956 * integer defining the number of seconds of idle time before an
1957 * association is closed.
1959 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
1962 struct sctp_sock
*sp
= sctp_sk(sk
);
1964 /* Applicable to UDP-style socket only */
1965 if (sctp_style(sk
, TCP
))
1967 if (optlen
!= sizeof(int))
1969 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
1975 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
1977 * Applications can enable or disable heartbeats for any peer address of
1978 * an association, modify an address's heartbeat interval, force a
1979 * heartbeat to be sent immediately, and adjust the address's maximum
1980 * number of retransmissions sent before an address is considered
1981 * unreachable. The following structure is used to access and modify an
1982 * address's parameters:
1984 * struct sctp_paddrparams {
1985 * sctp_assoc_t spp_assoc_id;
1986 * struct sockaddr_storage spp_address;
1987 * uint32_t spp_hbinterval;
1988 * uint16_t spp_pathmaxrxt;
1989 * uint32_t spp_pathmtu;
1990 * uint32_t spp_sackdelay;
1991 * uint32_t spp_flags;
1994 * spp_assoc_id - (one-to-many style socket) This is filled in the
1995 * application, and identifies the association for
1997 * spp_address - This specifies which address is of interest.
1998 * spp_hbinterval - This contains the value of the heartbeat interval,
1999 * in milliseconds. If a value of zero
2000 * is present in this field then no changes are to
2001 * be made to this parameter.
2002 * spp_pathmaxrxt - This contains the maximum number of
2003 * retransmissions before this address shall be
2004 * considered unreachable. If a value of zero
2005 * is present in this field then no changes are to
2006 * be made to this parameter.
2007 * spp_pathmtu - When Path MTU discovery is disabled the value
2008 * specified here will be the "fixed" path mtu.
2009 * Note that if the spp_address field is empty
2010 * then all associations on this address will
2011 * have this fixed path mtu set upon them.
2013 * spp_sackdelay - When delayed sack is enabled, this value specifies
2014 * the number of milliseconds that sacks will be delayed
2015 * for. This value will apply to all addresses of an
2016 * association if the spp_address field is empty. Note
2017 * also, that if delayed sack is enabled and this
2018 * value is set to 0, no change is made to the last
2019 * recorded delayed sack timer value.
2021 * spp_flags - These flags are used to control various features
2022 * on an association. The flag field may contain
2023 * zero or more of the following options.
2025 * SPP_HB_ENABLE - Enable heartbeats on the
2026 * specified address. Note that if the address
2027 * field is empty all addresses for the association
2028 * have heartbeats enabled upon them.
2030 * SPP_HB_DISABLE - Disable heartbeats on the
2031 * speicifed address. Note that if the address
2032 * field is empty all addresses for the association
2033 * will have their heartbeats disabled. Note also
2034 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2035 * mutually exclusive, only one of these two should
2036 * be specified. Enabling both fields will have
2037 * undetermined results.
2039 * SPP_HB_DEMAND - Request a user initiated heartbeat
2040 * to be made immediately.
2042 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2043 * heartbeat delayis to be set to the value of 0
2046 * SPP_PMTUD_ENABLE - This field will enable PMTU
2047 * discovery upon the specified address. Note that
2048 * if the address feild is empty then all addresses
2049 * on the association are effected.
2051 * SPP_PMTUD_DISABLE - This field will disable PMTU
2052 * discovery upon the specified address. Note that
2053 * if the address feild is empty then all addresses
2054 * on the association are effected. Not also that
2055 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2056 * exclusive. Enabling both will have undetermined
2059 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2060 * on delayed sack. The time specified in spp_sackdelay
2061 * is used to specify the sack delay for this address. Note
2062 * that if spp_address is empty then all addresses will
2063 * enable delayed sack and take on the sack delay
2064 * value specified in spp_sackdelay.
2065 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2066 * off delayed sack. If the spp_address field is blank then
2067 * delayed sack is disabled for the entire association. Note
2068 * also that this field is mutually exclusive to
2069 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2072 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2073 struct sctp_transport
*trans
,
2074 struct sctp_association
*asoc
,
2075 struct sctp_sock
*sp
,
2078 int sackdelay_change
)
2082 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2083 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2088 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2089 * this field is ignored. Note also that a value of zero indicates
2090 * the current setting should be left unchanged.
2092 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2094 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2095 * set. This lets us use 0 value when this flag
2098 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2099 params
->spp_hbinterval
= 0;
2101 if (params
->spp_hbinterval
||
2102 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2105 msecs_to_jiffies(params
->spp_hbinterval
);
2108 msecs_to_jiffies(params
->spp_hbinterval
);
2110 sp
->hbinterval
= params
->spp_hbinterval
;
2117 trans
->param_flags
=
2118 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2121 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2124 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2128 /* When Path MTU discovery is disabled the value specified here will
2129 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2130 * include the flag SPP_PMTUD_DISABLE for this field to have any
2133 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2135 trans
->pathmtu
= params
->spp_pathmtu
;
2136 sctp_assoc_sync_pmtu(asoc
);
2138 asoc
->pathmtu
= params
->spp_pathmtu
;
2139 sctp_frag_point(sp
, params
->spp_pathmtu
);
2141 sp
->pathmtu
= params
->spp_pathmtu
;
2147 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2148 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2149 trans
->param_flags
=
2150 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2152 sctp_transport_pmtu(trans
);
2153 sctp_assoc_sync_pmtu(asoc
);
2157 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2160 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2164 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2165 * value of this field is ignored. Note also that a value of zero
2166 * indicates the current setting should be left unchanged.
2168 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2171 msecs_to_jiffies(params
->spp_sackdelay
);
2174 msecs_to_jiffies(params
->spp_sackdelay
);
2176 sp
->sackdelay
= params
->spp_sackdelay
;
2180 if (sackdelay_change
) {
2182 trans
->param_flags
=
2183 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2187 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2191 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2196 /* Note that unless the spp_flag is set to SPP_PMTUD_ENABLE the value
2197 * of this field is ignored. Note also that a value of zero
2198 * indicates the current setting should be left unchanged.
2200 if ((params
->spp_flags
& SPP_PMTUD_ENABLE
) && params
->spp_pathmaxrxt
) {
2202 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2204 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2206 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2213 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2214 char __user
*optval
, int optlen
)
2216 struct sctp_paddrparams params
;
2217 struct sctp_transport
*trans
= NULL
;
2218 struct sctp_association
*asoc
= NULL
;
2219 struct sctp_sock
*sp
= sctp_sk(sk
);
2221 int hb_change
, pmtud_change
, sackdelay_change
;
2223 if (optlen
!= sizeof(struct sctp_paddrparams
))
2226 if (copy_from_user(¶ms
, optval
, optlen
))
2229 /* Validate flags and value parameters. */
2230 hb_change
= params
.spp_flags
& SPP_HB
;
2231 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2232 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2234 if (hb_change
== SPP_HB
||
2235 pmtud_change
== SPP_PMTUD
||
2236 sackdelay_change
== SPP_SACKDELAY
||
2237 params
.spp_sackdelay
> 500 ||
2239 && params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2242 /* If an address other than INADDR_ANY is specified, and
2243 * no transport is found, then the request is invalid.
2245 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
2246 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2247 params
.spp_assoc_id
);
2252 /* Get association, if assoc_id != 0 and the socket is a one
2253 * to many style socket, and an association was not found, then
2254 * the id was invalid.
2256 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2257 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2260 /* Heartbeat demand can only be sent on a transport or
2261 * association, but not a socket.
2263 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2266 /* Process parameters. */
2267 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2268 hb_change
, pmtud_change
,
2274 /* If changes are for association, also apply parameters to each
2277 if (!trans
&& asoc
) {
2278 struct list_head
*pos
;
2280 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2281 trans
= list_entry(pos
, struct sctp_transport
,
2283 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2284 hb_change
, pmtud_change
,
2292 /* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
2294 * This options will get or set the delayed ack timer. The time is set
2295 * in milliseconds. If the assoc_id is 0, then this sets or gets the
2296 * endpoints default delayed ack timer value. If the assoc_id field is
2297 * non-zero, then the set or get effects the specified association.
2299 * struct sctp_assoc_value {
2300 * sctp_assoc_t assoc_id;
2301 * uint32_t assoc_value;
2304 * assoc_id - This parameter, indicates which association the
2305 * user is preforming an action upon. Note that if
2306 * this field's value is zero then the endpoints
2307 * default value is changed (effecting future
2308 * associations only).
2310 * assoc_value - This parameter contains the number of milliseconds
2311 * that the user is requesting the delayed ACK timer
2312 * be set to. Note that this value is defined in
2313 * the standard to be between 200 and 500 milliseconds.
2315 * Note: a value of zero will leave the value alone,
2316 * but disable SACK delay. A non-zero value will also
2317 * enable SACK delay.
2320 static int sctp_setsockopt_delayed_ack_time(struct sock
*sk
,
2321 char __user
*optval
, int optlen
)
2323 struct sctp_assoc_value params
;
2324 struct sctp_transport
*trans
= NULL
;
2325 struct sctp_association
*asoc
= NULL
;
2326 struct sctp_sock
*sp
= sctp_sk(sk
);
2328 if (optlen
!= sizeof(struct sctp_assoc_value
))
2331 if (copy_from_user(¶ms
, optval
, optlen
))
2334 /* Validate value parameter. */
2335 if (params
.assoc_value
> 500)
2338 /* Get association, if assoc_id != 0 and the socket is a one
2339 * to many style socket, and an association was not found, then
2340 * the id was invalid.
2342 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2343 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
2346 if (params
.assoc_value
) {
2349 msecs_to_jiffies(params
.assoc_value
);
2351 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2352 SPP_SACKDELAY_ENABLE
;
2354 sp
->sackdelay
= params
.assoc_value
;
2356 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2357 SPP_SACKDELAY_ENABLE
;
2362 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2363 SPP_SACKDELAY_DISABLE
;
2366 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2367 SPP_SACKDELAY_DISABLE
;
2371 /* If change is for association, also apply to each transport. */
2373 struct list_head
*pos
;
2375 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2376 trans
= list_entry(pos
, struct sctp_transport
,
2378 if (params
.assoc_value
) {
2380 msecs_to_jiffies(params
.assoc_value
);
2381 trans
->param_flags
=
2382 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2383 SPP_SACKDELAY_ENABLE
;
2385 trans
->param_flags
=
2386 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2387 SPP_SACKDELAY_DISABLE
;
2395 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2397 * Applications can specify protocol parameters for the default association
2398 * initialization. The option name argument to setsockopt() and getsockopt()
2401 * Setting initialization parameters is effective only on an unconnected
2402 * socket (for UDP-style sockets only future associations are effected
2403 * by the change). With TCP-style sockets, this option is inherited by
2404 * sockets derived from a listener socket.
2406 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, int optlen
)
2408 struct sctp_initmsg sinit
;
2409 struct sctp_sock
*sp
= sctp_sk(sk
);
2411 if (optlen
!= sizeof(struct sctp_initmsg
))
2413 if (copy_from_user(&sinit
, optval
, optlen
))
2416 if (sinit
.sinit_num_ostreams
)
2417 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2418 if (sinit
.sinit_max_instreams
)
2419 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2420 if (sinit
.sinit_max_attempts
)
2421 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2422 if (sinit
.sinit_max_init_timeo
)
2423 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2429 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2431 * Applications that wish to use the sendto() system call may wish to
2432 * specify a default set of parameters that would normally be supplied
2433 * through the inclusion of ancillary data. This socket option allows
2434 * such an application to set the default sctp_sndrcvinfo structure.
2435 * The application that wishes to use this socket option simply passes
2436 * in to this call the sctp_sndrcvinfo structure defined in Section
2437 * 5.2.2) The input parameters accepted by this call include
2438 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2439 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2440 * to this call if the caller is using the UDP model.
2442 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2443 char __user
*optval
, int optlen
)
2445 struct sctp_sndrcvinfo info
;
2446 struct sctp_association
*asoc
;
2447 struct sctp_sock
*sp
= sctp_sk(sk
);
2449 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2451 if (copy_from_user(&info
, optval
, optlen
))
2454 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2455 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2459 asoc
->default_stream
= info
.sinfo_stream
;
2460 asoc
->default_flags
= info
.sinfo_flags
;
2461 asoc
->default_ppid
= info
.sinfo_ppid
;
2462 asoc
->default_context
= info
.sinfo_context
;
2463 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2465 sp
->default_stream
= info
.sinfo_stream
;
2466 sp
->default_flags
= info
.sinfo_flags
;
2467 sp
->default_ppid
= info
.sinfo_ppid
;
2468 sp
->default_context
= info
.sinfo_context
;
2469 sp
->default_timetolive
= info
.sinfo_timetolive
;
2475 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2477 * Requests that the local SCTP stack use the enclosed peer address as
2478 * the association primary. The enclosed address must be one of the
2479 * association peer's addresses.
2481 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2484 struct sctp_prim prim
;
2485 struct sctp_transport
*trans
;
2487 if (optlen
!= sizeof(struct sctp_prim
))
2490 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2493 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2497 sctp_assoc_set_primary(trans
->asoc
, trans
);
2503 * 7.1.5 SCTP_NODELAY
2505 * Turn on/off any Nagle-like algorithm. This means that packets are
2506 * generally sent as soon as possible and no unnecessary delays are
2507 * introduced, at the cost of more packets in the network. Expects an
2508 * integer boolean flag.
2510 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2515 if (optlen
< sizeof(int))
2517 if (get_user(val
, (int __user
*)optval
))
2520 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2526 * 7.1.1 SCTP_RTOINFO
2528 * The protocol parameters used to initialize and bound retransmission
2529 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2530 * and modify these parameters.
2531 * All parameters are time values, in milliseconds. A value of 0, when
2532 * modifying the parameters, indicates that the current value should not
2536 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, int optlen
) {
2537 struct sctp_rtoinfo rtoinfo
;
2538 struct sctp_association
*asoc
;
2540 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2543 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2546 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2548 /* Set the values to the specific association */
2549 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2553 if (rtoinfo
.srto_initial
!= 0)
2555 msecs_to_jiffies(rtoinfo
.srto_initial
);
2556 if (rtoinfo
.srto_max
!= 0)
2557 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2558 if (rtoinfo
.srto_min
!= 0)
2559 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2561 /* If there is no association or the association-id = 0
2562 * set the values to the endpoint.
2564 struct sctp_sock
*sp
= sctp_sk(sk
);
2566 if (rtoinfo
.srto_initial
!= 0)
2567 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2568 if (rtoinfo
.srto_max
!= 0)
2569 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2570 if (rtoinfo
.srto_min
!= 0)
2571 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2579 * 7.1.2 SCTP_ASSOCINFO
2581 * This option is used to tune the the maximum retransmission attempts
2582 * of the association.
2583 * Returns an error if the new association retransmission value is
2584 * greater than the sum of the retransmission value of the peer.
2585 * See [SCTP] for more information.
2588 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, int optlen
)
2591 struct sctp_assocparams assocparams
;
2592 struct sctp_association
*asoc
;
2594 if (optlen
!= sizeof(struct sctp_assocparams
))
2596 if (copy_from_user(&assocparams
, optval
, optlen
))
2599 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2601 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2604 /* Set the values to the specific association */
2606 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2609 struct list_head
*pos
;
2610 struct sctp_transport
*peer_addr
;
2612 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2613 peer_addr
= list_entry(pos
,
2614 struct sctp_transport
,
2616 path_sum
+= peer_addr
->pathmaxrxt
;
2620 /* Only validate asocmaxrxt if we have more then
2621 * one path/transport. We do this because path
2622 * retransmissions are only counted when we have more
2626 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2629 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2632 if (assocparams
.sasoc_cookie_life
!= 0) {
2633 asoc
->cookie_life
.tv_sec
=
2634 assocparams
.sasoc_cookie_life
/ 1000;
2635 asoc
->cookie_life
.tv_usec
=
2636 (assocparams
.sasoc_cookie_life
% 1000)
2640 /* Set the values to the endpoint */
2641 struct sctp_sock
*sp
= sctp_sk(sk
);
2643 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2644 sp
->assocparams
.sasoc_asocmaxrxt
=
2645 assocparams
.sasoc_asocmaxrxt
;
2646 if (assocparams
.sasoc_cookie_life
!= 0)
2647 sp
->assocparams
.sasoc_cookie_life
=
2648 assocparams
.sasoc_cookie_life
;
2654 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2656 * This socket option is a boolean flag which turns on or off mapped V4
2657 * addresses. If this option is turned on and the socket is type
2658 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2659 * If this option is turned off, then no mapping will be done of V4
2660 * addresses and a user will receive both PF_INET6 and PF_INET type
2661 * addresses on the socket.
2663 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, int optlen
)
2666 struct sctp_sock
*sp
= sctp_sk(sk
);
2668 if (optlen
< sizeof(int))
2670 if (get_user(val
, (int __user
*)optval
))
2681 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2683 * This socket option specifies the maximum size to put in any outgoing
2684 * SCTP chunk. If a message is larger than this size it will be
2685 * fragmented by SCTP into the specified size. Note that the underlying
2686 * SCTP implementation may fragment into smaller sized chunks when the
2687 * PMTU of the underlying association is smaller than the value set by
2690 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, int optlen
)
2692 struct sctp_association
*asoc
;
2693 struct list_head
*pos
;
2694 struct sctp_sock
*sp
= sctp_sk(sk
);
2697 if (optlen
< sizeof(int))
2699 if (get_user(val
, (int __user
*)optval
))
2701 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2703 sp
->user_frag
= val
;
2705 /* Update the frag_point of the existing associations. */
2706 list_for_each(pos
, &(sp
->ep
->asocs
)) {
2707 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
2708 asoc
->frag_point
= sctp_frag_point(sp
, asoc
->pathmtu
);
2716 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2718 * Requests that the peer mark the enclosed address as the association
2719 * primary. The enclosed address must be one of the association's
2720 * locally bound addresses. The following structure is used to make a
2721 * set primary request:
2723 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2726 struct sctp_sock
*sp
;
2727 struct sctp_endpoint
*ep
;
2728 struct sctp_association
*asoc
= NULL
;
2729 struct sctp_setpeerprim prim
;
2730 struct sctp_chunk
*chunk
;
2736 if (!sctp_addip_enable
)
2739 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2742 if (copy_from_user(&prim
, optval
, optlen
))
2745 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2749 if (!asoc
->peer
.asconf_capable
)
2752 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2755 if (!sctp_state(asoc
, ESTABLISHED
))
2758 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2759 return -EADDRNOTAVAIL
;
2761 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2762 chunk
= sctp_make_asconf_set_prim(asoc
,
2763 (union sctp_addr
*)&prim
.sspp_addr
);
2767 err
= sctp_send_asconf(asoc
, chunk
);
2769 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2774 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
2777 struct sctp_setadaptation adaptation
;
2779 if (optlen
!= sizeof(struct sctp_setadaptation
))
2781 if (copy_from_user(&adaptation
, optval
, optlen
))
2784 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
2790 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2792 * The context field in the sctp_sndrcvinfo structure is normally only
2793 * used when a failed message is retrieved holding the value that was
2794 * sent down on the actual send call. This option allows the setting of
2795 * a default context on an association basis that will be received on
2796 * reading messages from the peer. This is especially helpful in the
2797 * one-2-many model for an application to keep some reference to an
2798 * internal state machine that is processing messages on the
2799 * association. Note that the setting of this value only effects
2800 * received messages from the peer and does not effect the value that is
2801 * saved with outbound messages.
2803 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
2806 struct sctp_assoc_value params
;
2807 struct sctp_sock
*sp
;
2808 struct sctp_association
*asoc
;
2810 if (optlen
!= sizeof(struct sctp_assoc_value
))
2812 if (copy_from_user(¶ms
, optval
, optlen
))
2817 if (params
.assoc_id
!= 0) {
2818 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2821 asoc
->default_rcv_context
= params
.assoc_value
;
2823 sp
->default_rcv_context
= params
.assoc_value
;
2830 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
2832 * This options will at a minimum specify if the implementation is doing
2833 * fragmented interleave. Fragmented interleave, for a one to many
2834 * socket, is when subsequent calls to receive a message may return
2835 * parts of messages from different associations. Some implementations
2836 * may allow you to turn this value on or off. If so, when turned off,
2837 * no fragment interleave will occur (which will cause a head of line
2838 * blocking amongst multiple associations sharing the same one to many
2839 * socket). When this option is turned on, then each receive call may
2840 * come from a different association (thus the user must receive data
2841 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
2842 * association each receive belongs to.
2844 * This option takes a boolean value. A non-zero value indicates that
2845 * fragmented interleave is on. A value of zero indicates that
2846 * fragmented interleave is off.
2848 * Note that it is important that an implementation that allows this
2849 * option to be turned on, have it off by default. Otherwise an unaware
2850 * application using the one to many model may become confused and act
2853 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
2854 char __user
*optval
,
2859 if (optlen
!= sizeof(int))
2861 if (get_user(val
, (int __user
*)optval
))
2864 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
2870 * 7.1.25. Set or Get the sctp partial delivery point
2871 * (SCTP_PARTIAL_DELIVERY_POINT)
2872 * This option will set or get the SCTP partial delivery point. This
2873 * point is the size of a message where the partial delivery API will be
2874 * invoked to help free up rwnd space for the peer. Setting this to a
2875 * lower value will cause partial delivery's to happen more often. The
2876 * calls argument is an integer that sets or gets the partial delivery
2879 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
2880 char __user
*optval
,
2885 if (optlen
!= sizeof(u32
))
2887 if (get_user(val
, (int __user
*)optval
))
2890 sctp_sk(sk
)->pd_point
= val
;
2892 return 0; /* is this the right error code? */
2896 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
2898 * This option will allow a user to change the maximum burst of packets
2899 * that can be emitted by this association. Note that the default value
2900 * is 4, and some implementations may restrict this setting so that it
2901 * can only be lowered.
2903 * NOTE: This text doesn't seem right. Do this on a socket basis with
2904 * future associations inheriting the socket value.
2906 static int sctp_setsockopt_maxburst(struct sock
*sk
,
2907 char __user
*optval
,
2912 if (optlen
!= sizeof(int))
2914 if (get_user(val
, (int __user
*)optval
))
2920 sctp_sk(sk
)->max_burst
= val
;
2925 /* API 6.2 setsockopt(), getsockopt()
2927 * Applications use setsockopt() and getsockopt() to set or retrieve
2928 * socket options. Socket options are used to change the default
2929 * behavior of sockets calls. They are described in Section 7.
2933 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
2934 * int __user *optlen);
2935 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
2938 * sd - the socket descript.
2939 * level - set to IPPROTO_SCTP for all SCTP options.
2940 * optname - the option name.
2941 * optval - the buffer to store the value of the option.
2942 * optlen - the size of the buffer.
2944 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
2945 char __user
*optval
, int optlen
)
2949 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
2952 /* I can hardly begin to describe how wrong this is. This is
2953 * so broken as to be worse than useless. The API draft
2954 * REALLY is NOT helpful here... I am not convinced that the
2955 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
2956 * are at all well-founded.
2958 if (level
!= SOL_SCTP
) {
2959 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
2960 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2967 case SCTP_SOCKOPT_BINDX_ADD
:
2968 /* 'optlen' is the size of the addresses buffer. */
2969 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2970 optlen
, SCTP_BINDX_ADD_ADDR
);
2973 case SCTP_SOCKOPT_BINDX_REM
:
2974 /* 'optlen' is the size of the addresses buffer. */
2975 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2976 optlen
, SCTP_BINDX_REM_ADDR
);
2979 case SCTP_SOCKOPT_CONNECTX
:
2980 /* 'optlen' is the size of the addresses buffer. */
2981 retval
= sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)optval
,
2985 case SCTP_DISABLE_FRAGMENTS
:
2986 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
2990 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
2993 case SCTP_AUTOCLOSE
:
2994 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
2997 case SCTP_PEER_ADDR_PARAMS
:
2998 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3001 case SCTP_DELAYED_ACK_TIME
:
3002 retval
= sctp_setsockopt_delayed_ack_time(sk
, optval
, optlen
);
3004 case SCTP_PARTIAL_DELIVERY_POINT
:
3005 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3009 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3011 case SCTP_DEFAULT_SEND_PARAM
:
3012 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3015 case SCTP_PRIMARY_ADDR
:
3016 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3018 case SCTP_SET_PEER_PRIMARY_ADDR
:
3019 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3022 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3025 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3027 case SCTP_ASSOCINFO
:
3028 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3030 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3031 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3034 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3036 case SCTP_ADAPTATION_LAYER
:
3037 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3040 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3042 case SCTP_FRAGMENT_INTERLEAVE
:
3043 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3045 case SCTP_MAX_BURST
:
3046 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3049 retval
= -ENOPROTOOPT
;
3053 sctp_release_sock(sk
);
3059 /* API 3.1.6 connect() - UDP Style Syntax
3061 * An application may use the connect() call in the UDP model to initiate an
3062 * association without sending data.
3066 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3068 * sd: the socket descriptor to have a new association added to.
3070 * nam: the address structure (either struct sockaddr_in or struct
3071 * sockaddr_in6 defined in RFC2553 [7]).
3073 * len: the size of the address.
3075 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3083 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3084 __FUNCTION__
, sk
, addr
, addr_len
);
3086 /* Validate addr_len before calling common connect/connectx routine. */
3087 af
= sctp_get_af_specific(addr
->sa_family
);
3088 if (!af
|| addr_len
< af
->sockaddr_len
) {
3091 /* Pass correct addr len to common routine (so it knows there
3092 * is only one address being passed.
3094 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
);
3097 sctp_release_sock(sk
);
3101 /* FIXME: Write comments. */
3102 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
3104 return -EOPNOTSUPP
; /* STUB */
3107 /* 4.1.4 accept() - TCP Style Syntax
3109 * Applications use accept() call to remove an established SCTP
3110 * association from the accept queue of the endpoint. A new socket
3111 * descriptor will be returned from accept() to represent the newly
3112 * formed association.
3114 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3116 struct sctp_sock
*sp
;
3117 struct sctp_endpoint
*ep
;
3118 struct sock
*newsk
= NULL
;
3119 struct sctp_association
*asoc
;
3128 if (!sctp_style(sk
, TCP
)) {
3129 error
= -EOPNOTSUPP
;
3133 if (!sctp_sstate(sk
, LISTENING
)) {
3138 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3140 error
= sctp_wait_for_accept(sk
, timeo
);
3144 /* We treat the list of associations on the endpoint as the accept
3145 * queue and pick the first association on the list.
3147 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3149 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3155 /* Populate the fields of the newsk from the oldsk and migrate the
3156 * asoc to the newsk.
3158 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3161 sctp_release_sock(sk
);
3166 /* The SCTP ioctl handler. */
3167 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3169 return -ENOIOCTLCMD
;
3172 /* This is the function which gets called during socket creation to
3173 * initialized the SCTP-specific portion of the sock.
3174 * The sock structure should already be zero-filled memory.
3176 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
3178 struct sctp_endpoint
*ep
;
3179 struct sctp_sock
*sp
;
3181 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3185 /* Initialize the SCTP per socket area. */
3186 switch (sk
->sk_type
) {
3187 case SOCK_SEQPACKET
:
3188 sp
->type
= SCTP_SOCKET_UDP
;
3191 sp
->type
= SCTP_SOCKET_TCP
;
3194 return -ESOCKTNOSUPPORT
;
3197 /* Initialize default send parameters. These parameters can be
3198 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3200 sp
->default_stream
= 0;
3201 sp
->default_ppid
= 0;
3202 sp
->default_flags
= 0;
3203 sp
->default_context
= 0;
3204 sp
->default_timetolive
= 0;
3206 sp
->default_rcv_context
= 0;
3207 sp
->max_burst
= sctp_max_burst
;
3209 /* Initialize default setup parameters. These parameters
3210 * can be modified with the SCTP_INITMSG socket option or
3211 * overridden by the SCTP_INIT CMSG.
3213 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3214 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3215 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3216 sp
->initmsg
.sinit_max_init_timeo
= sctp_rto_max
;
3218 /* Initialize default RTO related parameters. These parameters can
3219 * be modified for with the SCTP_RTOINFO socket option.
3221 sp
->rtoinfo
.srto_initial
= sctp_rto_initial
;
3222 sp
->rtoinfo
.srto_max
= sctp_rto_max
;
3223 sp
->rtoinfo
.srto_min
= sctp_rto_min
;
3225 /* Initialize default association related parameters. These parameters
3226 * can be modified with the SCTP_ASSOCINFO socket option.
3228 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3229 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3230 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3231 sp
->assocparams
.sasoc_local_rwnd
= 0;
3232 sp
->assocparams
.sasoc_cookie_life
= sctp_valid_cookie_life
;
3234 /* Initialize default event subscriptions. By default, all the
3237 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3239 /* Default Peer Address Parameters. These defaults can
3240 * be modified via SCTP_PEER_ADDR_PARAMS
3242 sp
->hbinterval
= sctp_hb_interval
;
3243 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3244 sp
->pathmtu
= 0; // allow default discovery
3245 sp
->sackdelay
= sctp_sack_timeout
;
3246 sp
->param_flags
= SPP_HB_ENABLE
|
3248 SPP_SACKDELAY_ENABLE
;
3250 /* If enabled no SCTP message fragmentation will be performed.
3251 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3253 sp
->disable_fragments
= 0;
3255 /* Enable Nagle algorithm by default. */
3258 /* Enable by default. */
3261 /* Auto-close idle associations after the configured
3262 * number of seconds. A value of 0 disables this
3263 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3264 * for UDP-style sockets only.
3268 /* User specified fragmentation limit. */
3271 sp
->adaptation_ind
= 0;
3273 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3275 /* Control variables for partial data delivery. */
3276 atomic_set(&sp
->pd_mode
, 0);
3277 skb_queue_head_init(&sp
->pd_lobby
);
3278 sp
->frag_interleave
= 0;
3280 /* Create a per socket endpoint structure. Even if we
3281 * change the data structure relationships, this may still
3282 * be useful for storing pre-connect address information.
3284 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3291 SCTP_DBG_OBJCNT_INC(sock
);
3295 /* Cleanup any SCTP per socket resources. */
3296 SCTP_STATIC
int sctp_destroy_sock(struct sock
*sk
)
3298 struct sctp_endpoint
*ep
;
3300 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3302 /* Release our hold on the endpoint. */
3303 ep
= sctp_sk(sk
)->ep
;
3304 sctp_endpoint_free(ep
);
3309 /* API 4.1.7 shutdown() - TCP Style Syntax
3310 * int shutdown(int socket, int how);
3312 * sd - the socket descriptor of the association to be closed.
3313 * how - Specifies the type of shutdown. The values are
3316 * Disables further receive operations. No SCTP
3317 * protocol action is taken.
3319 * Disables further send operations, and initiates
3320 * the SCTP shutdown sequence.
3322 * Disables further send and receive operations
3323 * and initiates the SCTP shutdown sequence.
3325 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3327 struct sctp_endpoint
*ep
;
3328 struct sctp_association
*asoc
;
3330 if (!sctp_style(sk
, TCP
))
3333 if (how
& SEND_SHUTDOWN
) {
3334 ep
= sctp_sk(sk
)->ep
;
3335 if (!list_empty(&ep
->asocs
)) {
3336 asoc
= list_entry(ep
->asocs
.next
,
3337 struct sctp_association
, asocs
);
3338 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3343 /* 7.2.1 Association Status (SCTP_STATUS)
3345 * Applications can retrieve current status information about an
3346 * association, including association state, peer receiver window size,
3347 * number of unacked data chunks, and number of data chunks pending
3348 * receipt. This information is read-only.
3350 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3351 char __user
*optval
,
3354 struct sctp_status status
;
3355 struct sctp_association
*asoc
= NULL
;
3356 struct sctp_transport
*transport
;
3357 sctp_assoc_t associd
;
3360 if (len
!= sizeof(status
)) {
3365 if (copy_from_user(&status
, optval
, sizeof(status
))) {
3370 associd
= status
.sstat_assoc_id
;
3371 asoc
= sctp_id2assoc(sk
, associd
);
3377 transport
= asoc
->peer
.primary_path
;
3379 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3380 status
.sstat_state
= asoc
->state
;
3381 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3382 status
.sstat_unackdata
= asoc
->unack_data
;
3384 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3385 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3386 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3387 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3388 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3389 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
3390 transport
->af_specific
->sockaddr_len
);
3391 /* Map ipv4 address into v4-mapped-on-v6 address. */
3392 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3393 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3394 status
.sstat_primary
.spinfo_state
= transport
->state
;
3395 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3396 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3397 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3398 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3400 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3401 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3403 if (put_user(len
, optlen
)) {
3408 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3409 len
, status
.sstat_state
, status
.sstat_rwnd
,
3410 status
.sstat_assoc_id
);
3412 if (copy_to_user(optval
, &status
, len
)) {
3422 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3424 * Applications can retrieve information about a specific peer address
3425 * of an association, including its reachability state, congestion
3426 * window, and retransmission timer values. This information is
3429 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3430 char __user
*optval
,
3433 struct sctp_paddrinfo pinfo
;
3434 struct sctp_transport
*transport
;
3437 if (len
!= sizeof(pinfo
)) {
3442 if (copy_from_user(&pinfo
, optval
, sizeof(pinfo
))) {
3447 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3448 pinfo
.spinfo_assoc_id
);
3452 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3453 pinfo
.spinfo_state
= transport
->state
;
3454 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3455 pinfo
.spinfo_srtt
= transport
->srtt
;
3456 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3457 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3459 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3460 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3462 if (put_user(len
, optlen
)) {
3467 if (copy_to_user(optval
, &pinfo
, len
)) {
3476 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3478 * This option is a on/off flag. If enabled no SCTP message
3479 * fragmentation will be performed. Instead if a message being sent
3480 * exceeds the current PMTU size, the message will NOT be sent and
3481 * instead a error will be indicated to the user.
3483 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3484 char __user
*optval
, int __user
*optlen
)
3488 if (len
< sizeof(int))
3492 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3493 if (put_user(len
, optlen
))
3495 if (copy_to_user(optval
, &val
, len
))
3500 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3502 * This socket option is used to specify various notifications and
3503 * ancillary data the user wishes to receive.
3505 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
3508 if (len
!= sizeof(struct sctp_event_subscribe
))
3510 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
3515 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3517 * This socket option is applicable to the UDP-style socket only. When
3518 * set it will cause associations that are idle for more than the
3519 * specified number of seconds to automatically close. An association
3520 * being idle is defined an association that has NOT sent or received
3521 * user data. The special value of '0' indicates that no automatic
3522 * close of any associations should be performed. The option expects an
3523 * integer defining the number of seconds of idle time before an
3524 * association is closed.
3526 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3528 /* Applicable to UDP-style socket only */
3529 if (sctp_style(sk
, TCP
))
3531 if (len
!= sizeof(int))
3533 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, len
))
3538 /* Helper routine to branch off an association to a new socket. */
3539 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3540 struct socket
**sockp
)
3542 struct sock
*sk
= asoc
->base
.sk
;
3543 struct socket
*sock
;
3544 struct inet_sock
*inetsk
;
3547 /* An association cannot be branched off from an already peeled-off
3548 * socket, nor is this supported for tcp style sockets.
3550 if (!sctp_style(sk
, UDP
))
3553 /* Create a new socket. */
3554 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
3558 /* Populate the fields of the newsk from the oldsk and migrate the
3559 * asoc to the newsk.
3561 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
3563 /* Make peeled-off sockets more like 1-1 accepted sockets.
3564 * Set the daddr and initialize id to something more random
3566 inetsk
= inet_sk(sock
->sk
);
3567 inetsk
->daddr
= asoc
->peer
.primary_addr
.v4
.sin_addr
.s_addr
;
3568 inetsk
->id
= asoc
->next_tsn
^ jiffies
;
3575 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3577 sctp_peeloff_arg_t peeloff
;
3578 struct socket
*newsock
;
3580 struct sctp_association
*asoc
;
3582 if (len
!= sizeof(sctp_peeloff_arg_t
))
3584 if (copy_from_user(&peeloff
, optval
, len
))
3587 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
3593 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __FUNCTION__
, sk
, asoc
);
3595 retval
= sctp_do_peeloff(asoc
, &newsock
);
3599 /* Map the socket to an unused fd that can be returned to the user. */
3600 retval
= sock_map_fd(newsock
);
3602 sock_release(newsock
);
3606 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3607 __FUNCTION__
, sk
, asoc
, newsock
->sk
, retval
);
3609 /* Return the fd mapped to the new socket. */
3610 peeloff
.sd
= retval
;
3611 if (copy_to_user(optval
, &peeloff
, len
))
3618 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3620 * Applications can enable or disable heartbeats for any peer address of
3621 * an association, modify an address's heartbeat interval, force a
3622 * heartbeat to be sent immediately, and adjust the address's maximum
3623 * number of retransmissions sent before an address is considered
3624 * unreachable. The following structure is used to access and modify an
3625 * address's parameters:
3627 * struct sctp_paddrparams {
3628 * sctp_assoc_t spp_assoc_id;
3629 * struct sockaddr_storage spp_address;
3630 * uint32_t spp_hbinterval;
3631 * uint16_t spp_pathmaxrxt;
3632 * uint32_t spp_pathmtu;
3633 * uint32_t spp_sackdelay;
3634 * uint32_t spp_flags;
3637 * spp_assoc_id - (one-to-many style socket) This is filled in the
3638 * application, and identifies the association for
3640 * spp_address - This specifies which address is of interest.
3641 * spp_hbinterval - This contains the value of the heartbeat interval,
3642 * in milliseconds. If a value of zero
3643 * is present in this field then no changes are to
3644 * be made to this parameter.
3645 * spp_pathmaxrxt - This contains the maximum number of
3646 * retransmissions before this address shall be
3647 * considered unreachable. If a value of zero
3648 * is present in this field then no changes are to
3649 * be made to this parameter.
3650 * spp_pathmtu - When Path MTU discovery is disabled the value
3651 * specified here will be the "fixed" path mtu.
3652 * Note that if the spp_address field is empty
3653 * then all associations on this address will
3654 * have this fixed path mtu set upon them.
3656 * spp_sackdelay - When delayed sack is enabled, this value specifies
3657 * the number of milliseconds that sacks will be delayed
3658 * for. This value will apply to all addresses of an
3659 * association if the spp_address field is empty. Note
3660 * also, that if delayed sack is enabled and this
3661 * value is set to 0, no change is made to the last
3662 * recorded delayed sack timer value.
3664 * spp_flags - These flags are used to control various features
3665 * on an association. The flag field may contain
3666 * zero or more of the following options.
3668 * SPP_HB_ENABLE - Enable heartbeats on the
3669 * specified address. Note that if the address
3670 * field is empty all addresses for the association
3671 * have heartbeats enabled upon them.
3673 * SPP_HB_DISABLE - Disable heartbeats on the
3674 * speicifed address. Note that if the address
3675 * field is empty all addresses for the association
3676 * will have their heartbeats disabled. Note also
3677 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
3678 * mutually exclusive, only one of these two should
3679 * be specified. Enabling both fields will have
3680 * undetermined results.
3682 * SPP_HB_DEMAND - Request a user initiated heartbeat
3683 * to be made immediately.
3685 * SPP_PMTUD_ENABLE - This field will enable PMTU
3686 * discovery upon the specified address. Note that
3687 * if the address feild is empty then all addresses
3688 * on the association are effected.
3690 * SPP_PMTUD_DISABLE - This field will disable PMTU
3691 * discovery upon the specified address. Note that
3692 * if the address feild is empty then all addresses
3693 * on the association are effected. Not also that
3694 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
3695 * exclusive. Enabling both will have undetermined
3698 * SPP_SACKDELAY_ENABLE - Setting this flag turns
3699 * on delayed sack. The time specified in spp_sackdelay
3700 * is used to specify the sack delay for this address. Note
3701 * that if spp_address is empty then all addresses will
3702 * enable delayed sack and take on the sack delay
3703 * value specified in spp_sackdelay.
3704 * SPP_SACKDELAY_DISABLE - Setting this flag turns
3705 * off delayed sack. If the spp_address field is blank then
3706 * delayed sack is disabled for the entire association. Note
3707 * also that this field is mutually exclusive to
3708 * SPP_SACKDELAY_ENABLE, setting both will have undefined
3711 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
3712 char __user
*optval
, int __user
*optlen
)
3714 struct sctp_paddrparams params
;
3715 struct sctp_transport
*trans
= NULL
;
3716 struct sctp_association
*asoc
= NULL
;
3717 struct sctp_sock
*sp
= sctp_sk(sk
);
3719 if (len
!= sizeof(struct sctp_paddrparams
))
3722 if (copy_from_user(¶ms
, optval
, len
))
3725 /* If an address other than INADDR_ANY is specified, and
3726 * no transport is found, then the request is invalid.
3728 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
3729 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
3730 params
.spp_assoc_id
);
3732 SCTP_DEBUG_PRINTK("Failed no transport\n");
3737 /* Get association, if assoc_id != 0 and the socket is a one
3738 * to many style socket, and an association was not found, then
3739 * the id was invalid.
3741 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
3742 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
3743 SCTP_DEBUG_PRINTK("Failed no association\n");
3748 /* Fetch transport values. */
3749 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
3750 params
.spp_pathmtu
= trans
->pathmtu
;
3751 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
3752 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
3754 /*draft-11 doesn't say what to return in spp_flags*/
3755 params
.spp_flags
= trans
->param_flags
;
3757 /* Fetch association values. */
3758 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
3759 params
.spp_pathmtu
= asoc
->pathmtu
;
3760 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
3761 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
3763 /*draft-11 doesn't say what to return in spp_flags*/
3764 params
.spp_flags
= asoc
->param_flags
;
3766 /* Fetch socket values. */
3767 params
.spp_hbinterval
= sp
->hbinterval
;
3768 params
.spp_pathmtu
= sp
->pathmtu
;
3769 params
.spp_sackdelay
= sp
->sackdelay
;
3770 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
3772 /*draft-11 doesn't say what to return in spp_flags*/
3773 params
.spp_flags
= sp
->param_flags
;
3776 if (copy_to_user(optval
, ¶ms
, len
))
3779 if (put_user(len
, optlen
))
3785 /* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
3787 * This options will get or set the delayed ack timer. The time is set
3788 * in milliseconds. If the assoc_id is 0, then this sets or gets the
3789 * endpoints default delayed ack timer value. If the assoc_id field is
3790 * non-zero, then the set or get effects the specified association.
3792 * struct sctp_assoc_value {
3793 * sctp_assoc_t assoc_id;
3794 * uint32_t assoc_value;
3797 * assoc_id - This parameter, indicates which association the
3798 * user is preforming an action upon. Note that if
3799 * this field's value is zero then the endpoints
3800 * default value is changed (effecting future
3801 * associations only).
3803 * assoc_value - This parameter contains the number of milliseconds
3804 * that the user is requesting the delayed ACK timer
3805 * be set to. Note that this value is defined in
3806 * the standard to be between 200 and 500 milliseconds.
3808 * Note: a value of zero will leave the value alone,
3809 * but disable SACK delay. A non-zero value will also
3810 * enable SACK delay.
3812 static int sctp_getsockopt_delayed_ack_time(struct sock
*sk
, int len
,
3813 char __user
*optval
,
3816 struct sctp_assoc_value params
;
3817 struct sctp_association
*asoc
= NULL
;
3818 struct sctp_sock
*sp
= sctp_sk(sk
);
3820 if (len
!= sizeof(struct sctp_assoc_value
))
3823 if (copy_from_user(¶ms
, optval
, len
))
3826 /* Get association, if assoc_id != 0 and the socket is a one
3827 * to many style socket, and an association was not found, then
3828 * the id was invalid.
3830 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3831 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
3835 /* Fetch association values. */
3836 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
)
3837 params
.assoc_value
= jiffies_to_msecs(
3840 params
.assoc_value
= 0;
3842 /* Fetch socket values. */
3843 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
)
3844 params
.assoc_value
= sp
->sackdelay
;
3846 params
.assoc_value
= 0;
3849 if (copy_to_user(optval
, ¶ms
, len
))
3852 if (put_user(len
, optlen
))
3858 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
3860 * Applications can specify protocol parameters for the default association
3861 * initialization. The option name argument to setsockopt() and getsockopt()
3864 * Setting initialization parameters is effective only on an unconnected
3865 * socket (for UDP-style sockets only future associations are effected
3866 * by the change). With TCP-style sockets, this option is inherited by
3867 * sockets derived from a listener socket.
3869 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3871 if (len
!= sizeof(struct sctp_initmsg
))
3873 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
3878 static int sctp_getsockopt_peer_addrs_num_old(struct sock
*sk
, int len
,
3879 char __user
*optval
,
3883 struct sctp_association
*asoc
;
3884 struct list_head
*pos
;
3887 if (len
!= sizeof(sctp_assoc_t
))
3890 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
3893 /* For UDP-style sockets, id specifies the association to query. */
3894 asoc
= sctp_id2assoc(sk
, id
);
3898 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3906 * Old API for getting list of peer addresses. Does not work for 32-bit
3907 * programs running on a 64-bit kernel
3909 static int sctp_getsockopt_peer_addrs_old(struct sock
*sk
, int len
,
3910 char __user
*optval
,
3913 struct sctp_association
*asoc
;
3914 struct list_head
*pos
;
3916 struct sctp_getaddrs_old getaddrs
;
3917 struct sctp_transport
*from
;
3919 union sctp_addr temp
;
3920 struct sctp_sock
*sp
= sctp_sk(sk
);
3923 if (len
!= sizeof(struct sctp_getaddrs_old
))
3926 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs_old
)))
3929 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
3931 /* For UDP-style sockets, id specifies the association to query. */
3932 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3936 to
= (void __user
*)getaddrs
.addrs
;
3937 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3938 from
= list_entry(pos
, struct sctp_transport
, transports
);
3939 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
3940 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3941 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3942 if (copy_to_user(to
, &temp
, addrlen
))
3946 if (cnt
>= getaddrs
.addr_num
) break;
3948 getaddrs
.addr_num
= cnt
;
3949 if (copy_to_user(optval
, &getaddrs
, sizeof(struct sctp_getaddrs_old
)))
3955 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
3956 char __user
*optval
, int __user
*optlen
)
3958 struct sctp_association
*asoc
;
3959 struct list_head
*pos
;
3961 struct sctp_getaddrs getaddrs
;
3962 struct sctp_transport
*from
;
3964 union sctp_addr temp
;
3965 struct sctp_sock
*sp
= sctp_sk(sk
);
3970 if (len
< sizeof(struct sctp_getaddrs
))
3973 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
3976 /* For UDP-style sockets, id specifies the association to query. */
3977 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3981 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
3982 space_left
= len
- sizeof(struct sctp_getaddrs
) -
3983 offsetof(struct sctp_getaddrs
,addrs
);
3985 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3986 from
= list_entry(pos
, struct sctp_transport
, transports
);
3987 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
3988 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3989 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3990 if (space_left
< addrlen
)
3992 if (copy_to_user(to
, &temp
, addrlen
))
3996 space_left
-= addrlen
;
3999 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4001 bytes_copied
= ((char __user
*)to
) - optval
;
4002 if (put_user(bytes_copied
, optlen
))
4008 static int sctp_getsockopt_local_addrs_num_old(struct sock
*sk
, int len
,
4009 char __user
*optval
,
4013 struct sctp_bind_addr
*bp
;
4014 struct sctp_association
*asoc
;
4015 struct list_head
*pos
, *temp
;
4016 struct sctp_sockaddr_entry
*addr
;
4017 rwlock_t
*addr_lock
;
4020 if (len
!= sizeof(sctp_assoc_t
))
4023 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
4027 * For UDP-style sockets, id specifies the association to query.
4028 * If the id field is set to the value '0' then the locally bound
4029 * addresses are returned without regard to any particular
4033 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4034 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4036 asoc
= sctp_id2assoc(sk
, id
);
4039 bp
= &asoc
->base
.bind_addr
;
4040 addr_lock
= &asoc
->base
.addr_lock
;
4043 sctp_read_lock(addr_lock
);
4045 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
4046 * addresses from the global local address list.
4048 if (sctp_list_single_entry(&bp
->address_list
)) {
4049 addr
= list_entry(bp
->address_list
.next
,
4050 struct sctp_sockaddr_entry
, list
);
4051 if (sctp_is_any(&addr
->a
)) {
4052 list_for_each_safe(pos
, temp
, &sctp_local_addr_list
) {
4053 addr
= list_entry(pos
,
4054 struct sctp_sockaddr_entry
,
4056 if ((PF_INET
== sk
->sk_family
) &&
4057 (AF_INET6
== addr
->a
.sa
.sa_family
))
4067 list_for_each(pos
, &bp
->address_list
) {
4072 sctp_read_unlock(addr_lock
);
4076 /* Helper function that copies local addresses to user and returns the number
4077 * of addresses copied.
4079 static int sctp_copy_laddrs_old(struct sock
*sk
, __u16 port
,
4080 int max_addrs
, void *to
,
4083 struct list_head
*pos
, *next
;
4084 struct sctp_sockaddr_entry
*addr
;
4085 union sctp_addr temp
;
4089 list_for_each_safe(pos
, next
, &sctp_local_addr_list
) {
4090 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4091 if ((PF_INET
== sk
->sk_family
) &&
4092 (AF_INET6
== addr
->a
.sa
.sa_family
))
4094 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4095 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4097 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4098 memcpy(to
, &temp
, addrlen
);
4101 *bytes_copied
+= addrlen
;
4103 if (cnt
>= max_addrs
) break;
4109 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4110 size_t space_left
, int *bytes_copied
)
4112 struct list_head
*pos
, *next
;
4113 struct sctp_sockaddr_entry
*addr
;
4114 union sctp_addr temp
;
4118 list_for_each_safe(pos
, next
, &sctp_local_addr_list
) {
4119 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4120 if ((PF_INET
== sk
->sk_family
) &&
4121 (AF_INET6
== addr
->a
.sa
.sa_family
))
4123 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4124 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4126 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4127 if (space_left
< addrlen
)
4129 memcpy(to
, &temp
, addrlen
);
4133 space_left
-= addrlen
;
4134 bytes_copied
+= addrlen
;
4140 /* Old API for getting list of local addresses. Does not work for 32-bit
4141 * programs running on a 64-bit kernel
4143 static int sctp_getsockopt_local_addrs_old(struct sock
*sk
, int len
,
4144 char __user
*optval
, int __user
*optlen
)
4146 struct sctp_bind_addr
*bp
;
4147 struct sctp_association
*asoc
;
4148 struct list_head
*pos
;
4150 struct sctp_getaddrs_old getaddrs
;
4151 struct sctp_sockaddr_entry
*addr
;
4153 union sctp_addr temp
;
4154 struct sctp_sock
*sp
= sctp_sk(sk
);
4156 rwlock_t
*addr_lock
;
4159 int bytes_copied
= 0;
4161 if (len
!= sizeof(struct sctp_getaddrs_old
))
4164 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs_old
)))
4167 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
4169 * For UDP-style sockets, id specifies the association to query.
4170 * If the id field is set to the value '0' then the locally bound
4171 * addresses are returned without regard to any particular
4174 if (0 == getaddrs
.assoc_id
) {
4175 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4176 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4178 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4181 bp
= &asoc
->base
.bind_addr
;
4182 addr_lock
= &asoc
->base
.addr_lock
;
4185 to
= getaddrs
.addrs
;
4187 /* Allocate space for a local instance of packed array to hold all
4188 * the data. We store addresses here first and then put write them
4189 * to the user in one shot.
4191 addrs
= kmalloc(sizeof(union sctp_addr
) * getaddrs
.addr_num
,
4196 sctp_read_lock(addr_lock
);
4198 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4199 * addresses from the global local address list.
4201 if (sctp_list_single_entry(&bp
->address_list
)) {
4202 addr
= list_entry(bp
->address_list
.next
,
4203 struct sctp_sockaddr_entry
, list
);
4204 if (sctp_is_any(&addr
->a
)) {
4205 cnt
= sctp_copy_laddrs_old(sk
, bp
->port
,
4207 addrs
, &bytes_copied
);
4212 list_for_each(pos
, &bp
->address_list
) {
4213 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4214 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4215 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4216 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4217 memcpy(addrs
, &temp
, addrlen
);
4219 bytes_copied
+= addrlen
;
4221 if (cnt
>= getaddrs
.addr_num
) break;
4225 sctp_read_unlock(addr_lock
);
4227 /* copy the entire address list into the user provided space */
4228 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4233 /* copy the leading structure back to user */
4234 getaddrs
.addr_num
= cnt
;
4235 if (copy_to_user(optval
, &getaddrs
, sizeof(struct sctp_getaddrs_old
)))
4243 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4244 char __user
*optval
, int __user
*optlen
)
4246 struct sctp_bind_addr
*bp
;
4247 struct sctp_association
*asoc
;
4248 struct list_head
*pos
;
4250 struct sctp_getaddrs getaddrs
;
4251 struct sctp_sockaddr_entry
*addr
;
4253 union sctp_addr temp
;
4254 struct sctp_sock
*sp
= sctp_sk(sk
);
4256 rwlock_t
*addr_lock
;
4259 int bytes_copied
= 0;
4262 if (len
<= sizeof(struct sctp_getaddrs
))
4265 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4269 * For UDP-style sockets, id specifies the association to query.
4270 * If the id field is set to the value '0' then the locally bound
4271 * addresses are returned without regard to any particular
4274 if (0 == getaddrs
.assoc_id
) {
4275 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4276 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4278 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4281 bp
= &asoc
->base
.bind_addr
;
4282 addr_lock
= &asoc
->base
.addr_lock
;
4285 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4286 space_left
= len
- sizeof(struct sctp_getaddrs
) -
4287 offsetof(struct sctp_getaddrs
,addrs
);
4288 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4292 sctp_read_lock(addr_lock
);
4294 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4295 * addresses from the global local address list.
4297 if (sctp_list_single_entry(&bp
->address_list
)) {
4298 addr
= list_entry(bp
->address_list
.next
,
4299 struct sctp_sockaddr_entry
, list
);
4300 if (sctp_is_any(&addr
->a
)) {
4301 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4302 space_left
, &bytes_copied
);
4311 list_for_each(pos
, &bp
->address_list
) {
4312 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4313 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4314 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4315 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4316 if (space_left
< addrlen
) {
4317 err
= -ENOMEM
; /*fixme: right error?*/
4320 memcpy(addrs
, &temp
, addrlen
);
4322 bytes_copied
+= addrlen
;
4324 space_left
-= addrlen
;
4328 sctp_read_unlock(addr_lock
);
4330 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4334 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4336 if (put_user(bytes_copied
, optlen
))
4344 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4346 * Requests that the local SCTP stack use the enclosed peer address as
4347 * the association primary. The enclosed address must be one of the
4348 * association peer's addresses.
4350 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4351 char __user
*optval
, int __user
*optlen
)
4353 struct sctp_prim prim
;
4354 struct sctp_association
*asoc
;
4355 struct sctp_sock
*sp
= sctp_sk(sk
);
4357 if (len
!= sizeof(struct sctp_prim
))
4360 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
4363 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4367 if (!asoc
->peer
.primary_path
)
4370 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4371 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4373 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4374 (union sctp_addr
*)&prim
.ssp_addr
);
4376 if (copy_to_user(optval
, &prim
, sizeof(struct sctp_prim
)))
4383 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4385 * Requests that the local endpoint set the specified Adaptation Layer
4386 * Indication parameter for all future INIT and INIT-ACK exchanges.
4388 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4389 char __user
*optval
, int __user
*optlen
)
4391 struct sctp_setadaptation adaptation
;
4393 if (len
!= sizeof(struct sctp_setadaptation
))
4396 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4397 if (copy_to_user(optval
, &adaptation
, len
))
4405 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4407 * Applications that wish to use the sendto() system call may wish to
4408 * specify a default set of parameters that would normally be supplied
4409 * through the inclusion of ancillary data. This socket option allows
4410 * such an application to set the default sctp_sndrcvinfo structure.
4413 * The application that wishes to use this socket option simply passes
4414 * in to this call the sctp_sndrcvinfo structure defined in Section
4415 * 5.2.2) The input parameters accepted by this call include
4416 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4417 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4418 * to this call if the caller is using the UDP model.
4420 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4422 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4423 int len
, char __user
*optval
,
4426 struct sctp_sndrcvinfo info
;
4427 struct sctp_association
*asoc
;
4428 struct sctp_sock
*sp
= sctp_sk(sk
);
4430 if (len
!= sizeof(struct sctp_sndrcvinfo
))
4432 if (copy_from_user(&info
, optval
, sizeof(struct sctp_sndrcvinfo
)))
4435 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4436 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4440 info
.sinfo_stream
= asoc
->default_stream
;
4441 info
.sinfo_flags
= asoc
->default_flags
;
4442 info
.sinfo_ppid
= asoc
->default_ppid
;
4443 info
.sinfo_context
= asoc
->default_context
;
4444 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4446 info
.sinfo_stream
= sp
->default_stream
;
4447 info
.sinfo_flags
= sp
->default_flags
;
4448 info
.sinfo_ppid
= sp
->default_ppid
;
4449 info
.sinfo_context
= sp
->default_context
;
4450 info
.sinfo_timetolive
= sp
->default_timetolive
;
4453 if (copy_to_user(optval
, &info
, sizeof(struct sctp_sndrcvinfo
)))
4461 * 7.1.5 SCTP_NODELAY
4463 * Turn on/off any Nagle-like algorithm. This means that packets are
4464 * generally sent as soon as possible and no unnecessary delays are
4465 * introduced, at the cost of more packets in the network. Expects an
4466 * integer boolean flag.
4469 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4470 char __user
*optval
, int __user
*optlen
)
4474 if (len
< sizeof(int))
4478 val
= (sctp_sk(sk
)->nodelay
== 1);
4479 if (put_user(len
, optlen
))
4481 if (copy_to_user(optval
, &val
, len
))
4488 * 7.1.1 SCTP_RTOINFO
4490 * The protocol parameters used to initialize and bound retransmission
4491 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4492 * and modify these parameters.
4493 * All parameters are time values, in milliseconds. A value of 0, when
4494 * modifying the parameters, indicates that the current value should not
4498 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4499 char __user
*optval
,
4500 int __user
*optlen
) {
4501 struct sctp_rtoinfo rtoinfo
;
4502 struct sctp_association
*asoc
;
4504 if (len
!= sizeof (struct sctp_rtoinfo
))
4507 if (copy_from_user(&rtoinfo
, optval
, sizeof (struct sctp_rtoinfo
)))
4510 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4512 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4515 /* Values corresponding to the specific association. */
4517 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4518 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4519 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4521 /* Values corresponding to the endpoint. */
4522 struct sctp_sock
*sp
= sctp_sk(sk
);
4524 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4525 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4526 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4529 if (put_user(len
, optlen
))
4532 if (copy_to_user(optval
, &rtoinfo
, len
))
4540 * 7.1.2 SCTP_ASSOCINFO
4542 * This option is used to tune the the maximum retransmission attempts
4543 * of the association.
4544 * Returns an error if the new association retransmission value is
4545 * greater than the sum of the retransmission value of the peer.
4546 * See [SCTP] for more information.
4549 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4550 char __user
*optval
,
4554 struct sctp_assocparams assocparams
;
4555 struct sctp_association
*asoc
;
4556 struct list_head
*pos
;
4559 if (len
!= sizeof (struct sctp_assocparams
))
4562 if (copy_from_user(&assocparams
, optval
,
4563 sizeof (struct sctp_assocparams
)))
4566 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4568 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4571 /* Values correspoinding to the specific association */
4573 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4574 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4575 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4576 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4578 (asoc
->cookie_life
.tv_usec
4581 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4585 assocparams
.sasoc_number_peer_destinations
= cnt
;
4587 /* Values corresponding to the endpoint */
4588 struct sctp_sock
*sp
= sctp_sk(sk
);
4590 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4591 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4592 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4593 assocparams
.sasoc_cookie_life
=
4594 sp
->assocparams
.sasoc_cookie_life
;
4595 assocparams
.sasoc_number_peer_destinations
=
4597 sasoc_number_peer_destinations
;
4600 if (put_user(len
, optlen
))
4603 if (copy_to_user(optval
, &assocparams
, len
))
4610 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4612 * This socket option is a boolean flag which turns on or off mapped V4
4613 * addresses. If this option is turned on and the socket is type
4614 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4615 * If this option is turned off, then no mapping will be done of V4
4616 * addresses and a user will receive both PF_INET6 and PF_INET type
4617 * addresses on the socket.
4619 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
4620 char __user
*optval
, int __user
*optlen
)
4623 struct sctp_sock
*sp
= sctp_sk(sk
);
4625 if (len
< sizeof(int))
4630 if (put_user(len
, optlen
))
4632 if (copy_to_user(optval
, &val
, len
))
4639 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
4640 * (chapter and verse is quoted at sctp_setsockopt_context())
4642 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
4643 char __user
*optval
, int __user
*optlen
)
4645 struct sctp_assoc_value params
;
4646 struct sctp_sock
*sp
;
4647 struct sctp_association
*asoc
;
4649 if (len
!= sizeof(struct sctp_assoc_value
))
4652 if (copy_from_user(¶ms
, optval
, len
))
4657 if (params
.assoc_id
!= 0) {
4658 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4661 params
.assoc_value
= asoc
->default_rcv_context
;
4663 params
.assoc_value
= sp
->default_rcv_context
;
4666 if (put_user(len
, optlen
))
4668 if (copy_to_user(optval
, ¶ms
, len
))
4675 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
4677 * This socket option specifies the maximum size to put in any outgoing
4678 * SCTP chunk. If a message is larger than this size it will be
4679 * fragmented by SCTP into the specified size. Note that the underlying
4680 * SCTP implementation may fragment into smaller sized chunks when the
4681 * PMTU of the underlying association is smaller than the value set by
4684 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
4685 char __user
*optval
, int __user
*optlen
)
4689 if (len
< sizeof(int))
4694 val
= sctp_sk(sk
)->user_frag
;
4695 if (put_user(len
, optlen
))
4697 if (copy_to_user(optval
, &val
, len
))
4704 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
4705 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
4707 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
4708 char __user
*optval
, int __user
*optlen
)
4712 if (len
< sizeof(int))
4717 val
= sctp_sk(sk
)->frag_interleave
;
4718 if (put_user(len
, optlen
))
4720 if (copy_to_user(optval
, &val
, len
))
4727 * 7.1.25. Set or Get the sctp partial delivery point
4728 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
4730 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
4731 char __user
*optval
,
4736 if (len
< sizeof(u32
))
4741 val
= sctp_sk(sk
)->pd_point
;
4742 if (put_user(len
, optlen
))
4744 if (copy_to_user(optval
, &val
, len
))
4751 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
4752 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
4754 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
4755 char __user
*optval
,
4760 if (len
< sizeof(int))
4765 val
= sctp_sk(sk
)->max_burst
;
4766 if (put_user(len
, optlen
))
4768 if (copy_to_user(optval
, &val
, len
))
4774 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
4775 char __user
*optval
, int __user
*optlen
)
4780 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
4783 /* I can hardly begin to describe how wrong this is. This is
4784 * so broken as to be worse than useless. The API draft
4785 * REALLY is NOT helpful here... I am not convinced that the
4786 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
4787 * are at all well-founded.
4789 if (level
!= SOL_SCTP
) {
4790 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
4792 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
4796 if (get_user(len
, optlen
))
4803 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
4805 case SCTP_DISABLE_FRAGMENTS
:
4806 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
4810 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
4812 case SCTP_AUTOCLOSE
:
4813 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
4815 case SCTP_SOCKOPT_PEELOFF
:
4816 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
4818 case SCTP_PEER_ADDR_PARAMS
:
4819 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
4822 case SCTP_DELAYED_ACK_TIME
:
4823 retval
= sctp_getsockopt_delayed_ack_time(sk
, len
, optval
,
4827 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
4829 case SCTP_GET_PEER_ADDRS_NUM_OLD
:
4830 retval
= sctp_getsockopt_peer_addrs_num_old(sk
, len
, optval
,
4833 case SCTP_GET_LOCAL_ADDRS_NUM_OLD
:
4834 retval
= sctp_getsockopt_local_addrs_num_old(sk
, len
, optval
,
4837 case SCTP_GET_PEER_ADDRS_OLD
:
4838 retval
= sctp_getsockopt_peer_addrs_old(sk
, len
, optval
,
4841 case SCTP_GET_LOCAL_ADDRS_OLD
:
4842 retval
= sctp_getsockopt_local_addrs_old(sk
, len
, optval
,
4845 case SCTP_GET_PEER_ADDRS
:
4846 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
4849 case SCTP_GET_LOCAL_ADDRS
:
4850 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
4853 case SCTP_DEFAULT_SEND_PARAM
:
4854 retval
= sctp_getsockopt_default_send_param(sk
, len
,
4857 case SCTP_PRIMARY_ADDR
:
4858 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
4861 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
4864 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
4866 case SCTP_ASSOCINFO
:
4867 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
4869 case SCTP_I_WANT_MAPPED_V4_ADDR
:
4870 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
4873 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
4875 case SCTP_GET_PEER_ADDR_INFO
:
4876 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
4879 case SCTP_ADAPTATION_LAYER
:
4880 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
4884 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
4886 case SCTP_FRAGMENT_INTERLEAVE
:
4887 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
4890 case SCTP_PARTIAL_DELIVERY_POINT
:
4891 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
4894 case SCTP_MAX_BURST
:
4895 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
4898 retval
= -ENOPROTOOPT
;
4902 sctp_release_sock(sk
);
4906 static void sctp_hash(struct sock
*sk
)
4911 static void sctp_unhash(struct sock
*sk
)
4916 /* Check if port is acceptable. Possibly find first available port.
4918 * The port hash table (contained in the 'global' SCTP protocol storage
4919 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
4920 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
4921 * list (the list number is the port number hashed out, so as you
4922 * would expect from a hash function, all the ports in a given list have
4923 * such a number that hashes out to the same list number; you were
4924 * expecting that, right?); so each list has a set of ports, with a
4925 * link to the socket (struct sock) that uses it, the port number and
4926 * a fastreuse flag (FIXME: NPI ipg).
4928 static struct sctp_bind_bucket
*sctp_bucket_create(
4929 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
4931 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
4933 struct sctp_bind_hashbucket
*head
; /* hash list */
4934 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
4935 unsigned short snum
;
4938 snum
= ntohs(addr
->v4
.sin_port
);
4940 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
4941 sctp_local_bh_disable();
4944 /* Search for an available port.
4946 * 'sctp_port_rover' was the last port assigned, so
4947 * we start to search from 'sctp_port_rover +
4948 * 1'. What we do is first check if port 'rover' is
4949 * already in the hash table; if not, we use that; if
4950 * it is, we try next.
4952 int low
= sysctl_local_port_range
[0];
4953 int high
= sysctl_local_port_range
[1];
4954 int remaining
= (high
- low
) + 1;
4958 sctp_spin_lock(&sctp_port_alloc_lock
);
4959 rover
= sctp_port_rover
;
4962 if ((rover
< low
) || (rover
> high
))
4964 index
= sctp_phashfn(rover
);
4965 head
= &sctp_port_hashtable
[index
];
4966 sctp_spin_lock(&head
->lock
);
4967 for (pp
= head
->chain
; pp
; pp
= pp
->next
)
4968 if (pp
->port
== rover
)
4972 sctp_spin_unlock(&head
->lock
);
4973 } while (--remaining
> 0);
4974 sctp_port_rover
= rover
;
4975 sctp_spin_unlock(&sctp_port_alloc_lock
);
4977 /* Exhausted local port range during search? */
4982 /* OK, here is the one we will use. HEAD (the port
4983 * hash table list entry) is non-NULL and we hold it's
4988 /* We are given an specific port number; we verify
4989 * that it is not being used. If it is used, we will
4990 * exahust the search in the hash list corresponding
4991 * to the port number (snum) - we detect that with the
4992 * port iterator, pp being NULL.
4994 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
4995 sctp_spin_lock(&head
->lock
);
4996 for (pp
= head
->chain
; pp
; pp
= pp
->next
) {
4997 if (pp
->port
== snum
)
5004 if (!hlist_empty(&pp
->owner
)) {
5005 /* We had a port hash table hit - there is an
5006 * available port (pp != NULL) and it is being
5007 * used by other socket (pp->owner not empty); that other
5008 * socket is going to be sk2.
5010 int reuse
= sk
->sk_reuse
;
5012 struct hlist_node
*node
;
5014 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5015 if (pp
->fastreuse
&& sk
->sk_reuse
)
5018 /* Run through the list of sockets bound to the port
5019 * (pp->port) [via the pointers bind_next and
5020 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5021 * we get the endpoint they describe and run through
5022 * the endpoint's list of IP (v4 or v6) addresses,
5023 * comparing each of the addresses with the address of
5024 * the socket sk. If we find a match, then that means
5025 * that this port/socket (sk) combination are already
5028 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
5029 struct sctp_endpoint
*ep2
;
5030 ep2
= sctp_sk(sk2
)->ep
;
5032 if (reuse
&& sk2
->sk_reuse
)
5035 if (sctp_bind_addr_match(&ep2
->base
.bind_addr
, addr
,
5041 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5044 /* If there was a hash table miss, create a new port. */
5046 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
5049 /* In either case (hit or miss), make sure fastreuse is 1 only
5050 * if sk->sk_reuse is too (that is, if the caller requested
5051 * SO_REUSEADDR on this socket -sk-).
5053 if (hlist_empty(&pp
->owner
))
5054 pp
->fastreuse
= sk
->sk_reuse
? 1 : 0;
5055 else if (pp
->fastreuse
&& !sk
->sk_reuse
)
5058 /* We are set, so fill up all the data in the hash table
5059 * entry, tie the socket list information with the rest of the
5060 * sockets FIXME: Blurry, NPI (ipg).
5063 inet_sk(sk
)->num
= snum
;
5064 if (!sctp_sk(sk
)->bind_hash
) {
5065 sk_add_bind_node(sk
, &pp
->owner
);
5066 sctp_sk(sk
)->bind_hash
= pp
;
5071 sctp_spin_unlock(&head
->lock
);
5074 sctp_local_bh_enable();
5078 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5079 * port is requested.
5081 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
5084 union sctp_addr addr
;
5085 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5087 /* Set up a dummy address struct from the sk. */
5088 af
->from_sk(&addr
, sk
);
5089 addr
.v4
.sin_port
= htons(snum
);
5091 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5092 ret
= sctp_get_port_local(sk
, &addr
);
5094 return (ret
? 1 : 0);
5098 * 3.1.3 listen() - UDP Style Syntax
5100 * By default, new associations are not accepted for UDP style sockets.
5101 * An application uses listen() to mark a socket as being able to
5102 * accept new associations.
5104 SCTP_STATIC
int sctp_seqpacket_listen(struct sock
*sk
, int backlog
)
5106 struct sctp_sock
*sp
= sctp_sk(sk
);
5107 struct sctp_endpoint
*ep
= sp
->ep
;
5109 /* Only UDP style sockets that are not peeled off are allowed to
5112 if (!sctp_style(sk
, UDP
))
5115 /* If backlog is zero, disable listening. */
5117 if (sctp_sstate(sk
, CLOSED
))
5120 sctp_unhash_endpoint(ep
);
5121 sk
->sk_state
= SCTP_SS_CLOSED
;
5124 /* Return if we are already listening. */
5125 if (sctp_sstate(sk
, LISTENING
))
5129 * If a bind() or sctp_bindx() is not called prior to a listen()
5130 * call that allows new associations to be accepted, the system
5131 * picks an ephemeral port and will choose an address set equivalent
5132 * to binding with a wildcard address.
5134 * This is not currently spelled out in the SCTP sockets
5135 * extensions draft, but follows the practice as seen in TCP
5138 if (!ep
->base
.bind_addr
.port
) {
5139 if (sctp_autobind(sk
))
5142 sk
->sk_state
= SCTP_SS_LISTENING
;
5143 sctp_hash_endpoint(ep
);
5148 * 4.1.3 listen() - TCP Style Syntax
5150 * Applications uses listen() to ready the SCTP endpoint for accepting
5151 * inbound associations.
5153 SCTP_STATIC
int sctp_stream_listen(struct sock
*sk
, int backlog
)
5155 struct sctp_sock
*sp
= sctp_sk(sk
);
5156 struct sctp_endpoint
*ep
= sp
->ep
;
5158 /* If backlog is zero, disable listening. */
5160 if (sctp_sstate(sk
, CLOSED
))
5163 sctp_unhash_endpoint(ep
);
5164 sk
->sk_state
= SCTP_SS_CLOSED
;
5167 if (sctp_sstate(sk
, LISTENING
))
5171 * If a bind() or sctp_bindx() is not called prior to a listen()
5172 * call that allows new associations to be accepted, the system
5173 * picks an ephemeral port and will choose an address set equivalent
5174 * to binding with a wildcard address.
5176 * This is not currently spelled out in the SCTP sockets
5177 * extensions draft, but follows the practice as seen in TCP
5180 if (!ep
->base
.bind_addr
.port
) {
5181 if (sctp_autobind(sk
))
5184 sk
->sk_state
= SCTP_SS_LISTENING
;
5185 sk
->sk_max_ack_backlog
= backlog
;
5186 sctp_hash_endpoint(ep
);
5191 * Move a socket to LISTENING state.
5193 int sctp_inet_listen(struct socket
*sock
, int backlog
)
5195 struct sock
*sk
= sock
->sk
;
5196 struct crypto_hash
*tfm
= NULL
;
5199 if (unlikely(backlog
< 0))
5204 if (sock
->state
!= SS_UNCONNECTED
)
5207 /* Allocate HMAC for generating cookie. */
5208 if (sctp_hmac_alg
) {
5209 tfm
= crypto_alloc_hash(sctp_hmac_alg
, 0, CRYPTO_ALG_ASYNC
);
5216 switch (sock
->type
) {
5217 case SOCK_SEQPACKET
:
5218 err
= sctp_seqpacket_listen(sk
, backlog
);
5221 err
= sctp_stream_listen(sk
, backlog
);
5230 /* Store away the transform reference. */
5231 sctp_sk(sk
)->hmac
= tfm
;
5233 sctp_release_sock(sk
);
5236 crypto_free_hash(tfm
);
5241 * This function is done by modeling the current datagram_poll() and the
5242 * tcp_poll(). Note that, based on these implementations, we don't
5243 * lock the socket in this function, even though it seems that,
5244 * ideally, locking or some other mechanisms can be used to ensure
5245 * the integrity of the counters (sndbuf and wmem_alloc) used
5246 * in this place. We assume that we don't need locks either until proven
5249 * Another thing to note is that we include the Async I/O support
5250 * here, again, by modeling the current TCP/UDP code. We don't have
5251 * a good way to test with it yet.
5253 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
5255 struct sock
*sk
= sock
->sk
;
5256 struct sctp_sock
*sp
= sctp_sk(sk
);
5259 poll_wait(file
, sk
->sk_sleep
, wait
);
5261 /* A TCP-style listening socket becomes readable when the accept queue
5264 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
5265 return (!list_empty(&sp
->ep
->asocs
)) ?
5266 (POLLIN
| POLLRDNORM
) : 0;
5270 /* Is there any exceptional events? */
5271 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
5273 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5275 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
5278 /* Is it readable? Reconsider this code with TCP-style support. */
5279 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
5280 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
5281 mask
|= POLLIN
| POLLRDNORM
;
5283 /* The association is either gone or not ready. */
5284 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
5287 /* Is it writable? */
5288 if (sctp_writeable(sk
)) {
5289 mask
|= POLLOUT
| POLLWRNORM
;
5291 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
5293 * Since the socket is not locked, the buffer
5294 * might be made available after the writeable check and
5295 * before the bit is set. This could cause a lost I/O
5296 * signal. tcp_poll() has a race breaker for this race
5297 * condition. Based on their implementation, we put
5298 * in the following code to cover it as well.
5300 if (sctp_writeable(sk
))
5301 mask
|= POLLOUT
| POLLWRNORM
;
5306 /********************************************************************
5307 * 2nd Level Abstractions
5308 ********************************************************************/
5310 static struct sctp_bind_bucket
*sctp_bucket_create(
5311 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
5313 struct sctp_bind_bucket
*pp
;
5315 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
5316 SCTP_DBG_OBJCNT_INC(bind_bucket
);
5320 INIT_HLIST_HEAD(&pp
->owner
);
5321 if ((pp
->next
= head
->chain
) != NULL
)
5322 pp
->next
->pprev
= &pp
->next
;
5324 pp
->pprev
= &head
->chain
;
5329 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5330 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
5332 if (pp
&& hlist_empty(&pp
->owner
)) {
5334 pp
->next
->pprev
= pp
->pprev
;
5335 *(pp
->pprev
) = pp
->next
;
5336 kmem_cache_free(sctp_bucket_cachep
, pp
);
5337 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
5341 /* Release this socket's reference to a local port. */
5342 static inline void __sctp_put_port(struct sock
*sk
)
5344 struct sctp_bind_hashbucket
*head
=
5345 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->num
)];
5346 struct sctp_bind_bucket
*pp
;
5348 sctp_spin_lock(&head
->lock
);
5349 pp
= sctp_sk(sk
)->bind_hash
;
5350 __sk_del_bind_node(sk
);
5351 sctp_sk(sk
)->bind_hash
= NULL
;
5352 inet_sk(sk
)->num
= 0;
5353 sctp_bucket_destroy(pp
);
5354 sctp_spin_unlock(&head
->lock
);
5357 void sctp_put_port(struct sock
*sk
)
5359 sctp_local_bh_disable();
5360 __sctp_put_port(sk
);
5361 sctp_local_bh_enable();
5365 * The system picks an ephemeral port and choose an address set equivalent
5366 * to binding with a wildcard address.
5367 * One of those addresses will be the primary address for the association.
5368 * This automatically enables the multihoming capability of SCTP.
5370 static int sctp_autobind(struct sock
*sk
)
5372 union sctp_addr autoaddr
;
5376 /* Initialize a local sockaddr structure to INADDR_ANY. */
5377 af
= sctp_sk(sk
)->pf
->af
;
5379 port
= htons(inet_sk(sk
)->num
);
5380 af
->inaddr_any(&autoaddr
, port
);
5382 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5385 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5388 * 4.2 The cmsghdr Structure *
5390 * When ancillary data is sent or received, any number of ancillary data
5391 * objects can be specified by the msg_control and msg_controllen members of
5392 * the msghdr structure, because each object is preceded by
5393 * a cmsghdr structure defining the object's length (the cmsg_len member).
5394 * Historically Berkeley-derived implementations have passed only one object
5395 * at a time, but this API allows multiple objects to be
5396 * passed in a single call to sendmsg() or recvmsg(). The following example
5397 * shows two ancillary data objects in a control buffer.
5399 * |<--------------------------- msg_controllen -------------------------->|
5402 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5404 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5407 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5409 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5412 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5413 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5415 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5417 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5424 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
5425 sctp_cmsgs_t
*cmsgs
)
5427 struct cmsghdr
*cmsg
;
5429 for (cmsg
= CMSG_FIRSTHDR(msg
);
5431 cmsg
= CMSG_NXTHDR((struct msghdr
*)msg
, cmsg
)) {
5432 if (!CMSG_OK(msg
, cmsg
))
5435 /* Should we parse this header or ignore? */
5436 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
5439 /* Strictly check lengths following example in SCM code. */
5440 switch (cmsg
->cmsg_type
) {
5442 /* SCTP Socket API Extension
5443 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5445 * This cmsghdr structure provides information for
5446 * initializing new SCTP associations with sendmsg().
5447 * The SCTP_INITMSG socket option uses this same data
5448 * structure. This structure is not used for
5451 * cmsg_level cmsg_type cmsg_data[]
5452 * ------------ ------------ ----------------------
5453 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5455 if (cmsg
->cmsg_len
!=
5456 CMSG_LEN(sizeof(struct sctp_initmsg
)))
5458 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
5462 /* SCTP Socket API Extension
5463 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5465 * This cmsghdr structure specifies SCTP options for
5466 * sendmsg() and describes SCTP header information
5467 * about a received message through recvmsg().
5469 * cmsg_level cmsg_type cmsg_data[]
5470 * ------------ ------------ ----------------------
5471 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5473 if (cmsg
->cmsg_len
!=
5474 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
5478 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
5480 /* Minimally, validate the sinfo_flags. */
5481 if (cmsgs
->info
->sinfo_flags
&
5482 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
5483 SCTP_ABORT
| SCTP_EOF
))
5495 * Wait for a packet..
5496 * Note: This function is the same function as in core/datagram.c
5497 * with a few modifications to make lksctp work.
5499 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
5504 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5506 /* Socket errors? */
5507 error
= sock_error(sk
);
5511 if (!skb_queue_empty(&sk
->sk_receive_queue
))
5514 /* Socket shut down? */
5515 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5518 /* Sequenced packets can come disconnected. If so we report the
5523 /* Is there a good reason to think that we may receive some data? */
5524 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
5527 /* Handle signals. */
5528 if (signal_pending(current
))
5531 /* Let another process have a go. Since we are going to sleep
5532 * anyway. Note: This may cause odd behaviors if the message
5533 * does not fit in the user's buffer, but this seems to be the
5534 * only way to honor MSG_DONTWAIT realistically.
5536 sctp_release_sock(sk
);
5537 *timeo_p
= schedule_timeout(*timeo_p
);
5541 finish_wait(sk
->sk_sleep
, &wait
);
5545 error
= sock_intr_errno(*timeo_p
);
5548 finish_wait(sk
->sk_sleep
, &wait
);
5553 /* Receive a datagram.
5554 * Note: This is pretty much the same routine as in core/datagram.c
5555 * with a few changes to make lksctp work.
5557 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
5558 int noblock
, int *err
)
5561 struct sk_buff
*skb
;
5564 timeo
= sock_rcvtimeo(sk
, noblock
);
5566 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
5567 timeo
, MAX_SCHEDULE_TIMEOUT
);
5570 /* Again only user level code calls this function,
5571 * so nothing interrupt level
5572 * will suddenly eat the receive_queue.
5574 * Look at current nfs client by the way...
5575 * However, this function was corrent in any case. 8)
5577 if (flags
& MSG_PEEK
) {
5578 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
5579 skb
= skb_peek(&sk
->sk_receive_queue
);
5581 atomic_inc(&skb
->users
);
5582 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
5584 skb
= skb_dequeue(&sk
->sk_receive_queue
);
5590 /* Caller is allowed not to check sk->sk_err before calling. */
5591 error
= sock_error(sk
);
5595 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5598 /* User doesn't want to wait. */
5602 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
5611 /* If sndbuf has changed, wake up per association sndbuf waiters. */
5612 static void __sctp_write_space(struct sctp_association
*asoc
)
5614 struct sock
*sk
= asoc
->base
.sk
;
5615 struct socket
*sock
= sk
->sk_socket
;
5617 if ((sctp_wspace(asoc
) > 0) && sock
) {
5618 if (waitqueue_active(&asoc
->wait
))
5619 wake_up_interruptible(&asoc
->wait
);
5621 if (sctp_writeable(sk
)) {
5622 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
5623 wake_up_interruptible(sk
->sk_sleep
);
5625 /* Note that we try to include the Async I/O support
5626 * here by modeling from the current TCP/UDP code.
5627 * We have not tested with it yet.
5629 if (sock
->fasync_list
&&
5630 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
5631 sock_wake_async(sock
, 2, POLL_OUT
);
5636 /* Do accounting for the sndbuf space.
5637 * Decrement the used sndbuf space of the corresponding association by the
5638 * data size which was just transmitted(freed).
5640 static void sctp_wfree(struct sk_buff
*skb
)
5642 struct sctp_association
*asoc
;
5643 struct sctp_chunk
*chunk
;
5646 /* Get the saved chunk pointer. */
5647 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
5650 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
5651 sizeof(struct sk_buff
) +
5652 sizeof(struct sctp_chunk
);
5654 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
5657 __sctp_write_space(asoc
);
5659 sctp_association_put(asoc
);
5662 /* Do accounting for the receive space on the socket.
5663 * Accounting for the association is done in ulpevent.c
5664 * We set this as a destructor for the cloned data skbs so that
5665 * accounting is done at the correct time.
5667 void sctp_sock_rfree(struct sk_buff
*skb
)
5669 struct sock
*sk
= skb
->sk
;
5670 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
5672 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
5676 /* Helper function to wait for space in the sndbuf. */
5677 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
5680 struct sock
*sk
= asoc
->base
.sk
;
5682 long current_timeo
= *timeo_p
;
5685 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
5686 asoc
, (long)(*timeo_p
), msg_len
);
5688 /* Increment the association's refcnt. */
5689 sctp_association_hold(asoc
);
5691 /* Wait on the association specific sndbuf space. */
5693 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
5694 TASK_INTERRUPTIBLE
);
5697 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
5700 if (signal_pending(current
))
5701 goto do_interrupted
;
5702 if (msg_len
<= sctp_wspace(asoc
))
5705 /* Let another process have a go. Since we are going
5708 sctp_release_sock(sk
);
5709 current_timeo
= schedule_timeout(current_timeo
);
5710 BUG_ON(sk
!= asoc
->base
.sk
);
5713 *timeo_p
= current_timeo
;
5717 finish_wait(&asoc
->wait
, &wait
);
5719 /* Release the association's refcnt. */
5720 sctp_association_put(asoc
);
5729 err
= sock_intr_errno(*timeo_p
);
5737 /* If socket sndbuf has changed, wake up all per association waiters. */
5738 void sctp_write_space(struct sock
*sk
)
5740 struct sctp_association
*asoc
;
5741 struct list_head
*pos
;
5743 /* Wake up the tasks in each wait queue. */
5744 list_for_each(pos
, &((sctp_sk(sk
))->ep
->asocs
)) {
5745 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
5746 __sctp_write_space(asoc
);
5750 /* Is there any sndbuf space available on the socket?
5752 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
5753 * associations on the same socket. For a UDP-style socket with
5754 * multiple associations, it is possible for it to be "unwriteable"
5755 * prematurely. I assume that this is acceptable because
5756 * a premature "unwriteable" is better than an accidental "writeable" which
5757 * would cause an unwanted block under certain circumstances. For the 1-1
5758 * UDP-style sockets or TCP-style sockets, this code should work.
5761 static int sctp_writeable(struct sock
*sk
)
5765 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
5771 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
5772 * returns immediately with EINPROGRESS.
5774 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
5776 struct sock
*sk
= asoc
->base
.sk
;
5778 long current_timeo
= *timeo_p
;
5781 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __FUNCTION__
, asoc
,
5784 /* Increment the association's refcnt. */
5785 sctp_association_hold(asoc
);
5788 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
5789 TASK_INTERRUPTIBLE
);
5792 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5794 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
5797 if (signal_pending(current
))
5798 goto do_interrupted
;
5800 if (sctp_state(asoc
, ESTABLISHED
))
5803 /* Let another process have a go. Since we are going
5806 sctp_release_sock(sk
);
5807 current_timeo
= schedule_timeout(current_timeo
);
5810 *timeo_p
= current_timeo
;
5814 finish_wait(&asoc
->wait
, &wait
);
5816 /* Release the association's refcnt. */
5817 sctp_association_put(asoc
);
5822 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
5825 err
= -ECONNREFUSED
;
5829 err
= sock_intr_errno(*timeo_p
);
5837 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
5839 struct sctp_endpoint
*ep
;
5843 ep
= sctp_sk(sk
)->ep
;
5847 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
,
5848 TASK_INTERRUPTIBLE
);
5850 if (list_empty(&ep
->asocs
)) {
5851 sctp_release_sock(sk
);
5852 timeo
= schedule_timeout(timeo
);
5857 if (!sctp_sstate(sk
, LISTENING
))
5861 if (!list_empty(&ep
->asocs
))
5864 err
= sock_intr_errno(timeo
);
5865 if (signal_pending(current
))
5873 finish_wait(sk
->sk_sleep
, &wait
);
5878 void sctp_wait_for_close(struct sock
*sk
, long timeout
)
5883 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5884 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
5886 sctp_release_sock(sk
);
5887 timeout
= schedule_timeout(timeout
);
5889 } while (!signal_pending(current
) && timeout
);
5891 finish_wait(sk
->sk_sleep
, &wait
);
5894 static void sctp_sock_rfree_frag(struct sk_buff
*skb
)
5896 struct sk_buff
*frag
;
5901 /* Don't forget the fragments. */
5902 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
5903 sctp_sock_rfree_frag(frag
);
5906 sctp_sock_rfree(skb
);
5909 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
5911 struct sk_buff
*frag
;
5916 /* Don't forget the fragments. */
5917 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
5918 sctp_skb_set_owner_r_frag(frag
, sk
);
5921 sctp_skb_set_owner_r(skb
, sk
);
5924 /* Populate the fields of the newsk from the oldsk and migrate the assoc
5925 * and its messages to the newsk.
5927 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
5928 struct sctp_association
*assoc
,
5929 sctp_socket_type_t type
)
5931 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
5932 struct sctp_sock
*newsp
= sctp_sk(newsk
);
5933 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5934 struct sctp_endpoint
*newep
= newsp
->ep
;
5935 struct sk_buff
*skb
, *tmp
;
5936 struct sctp_ulpevent
*event
;
5939 /* Migrate socket buffer sizes and all the socket level options to the
5942 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
5943 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
5944 /* Brute force copy old sctp opt. */
5945 inet_sk_copy_descendant(newsk
, oldsk
);
5947 /* Restore the ep value that was overwritten with the above structure
5953 /* Hook this new socket in to the bind_hash list. */
5954 pp
= sctp_sk(oldsk
)->bind_hash
;
5955 sk_add_bind_node(newsk
, &pp
->owner
);
5956 sctp_sk(newsk
)->bind_hash
= pp
;
5957 inet_sk(newsk
)->num
= inet_sk(oldsk
)->num
;
5959 /* Copy the bind_addr list from the original endpoint to the new
5960 * endpoint so that we can handle restarts properly
5962 if (PF_INET6
== assoc
->base
.sk
->sk_family
)
5963 flags
= SCTP_ADDR6_ALLOWED
;
5964 if (assoc
->peer
.ipv4_address
)
5965 flags
|= SCTP_ADDR4_PEERSUPP
;
5966 if (assoc
->peer
.ipv6_address
)
5967 flags
|= SCTP_ADDR6_PEERSUPP
;
5968 sctp_bind_addr_copy(&newsp
->ep
->base
.bind_addr
,
5969 &oldsp
->ep
->base
.bind_addr
,
5970 SCTP_SCOPE_GLOBAL
, GFP_KERNEL
, flags
);
5972 /* Move any messages in the old socket's receive queue that are for the
5973 * peeled off association to the new socket's receive queue.
5975 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
5976 event
= sctp_skb2event(skb
);
5977 if (event
->asoc
== assoc
) {
5978 sctp_sock_rfree_frag(skb
);
5979 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
5980 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
5981 sctp_skb_set_owner_r_frag(skb
, newsk
);
5985 /* Clean up any messages pending delivery due to partial
5986 * delivery. Three cases:
5987 * 1) No partial deliver; no work.
5988 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
5989 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
5991 skb_queue_head_init(&newsp
->pd_lobby
);
5992 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
5994 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
5995 struct sk_buff_head
*queue
;
5997 /* Decide which queue to move pd_lobby skbs to. */
5998 if (assoc
->ulpq
.pd_mode
) {
5999 queue
= &newsp
->pd_lobby
;
6001 queue
= &newsk
->sk_receive_queue
;
6003 /* Walk through the pd_lobby, looking for skbs that
6004 * need moved to the new socket.
6006 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6007 event
= sctp_skb2event(skb
);
6008 if (event
->asoc
== assoc
) {
6009 sctp_sock_rfree_frag(skb
);
6010 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6011 __skb_queue_tail(queue
, skb
);
6012 sctp_skb_set_owner_r_frag(skb
, newsk
);
6016 /* Clear up any skbs waiting for the partial
6017 * delivery to finish.
6019 if (assoc
->ulpq
.pd_mode
)
6020 sctp_clear_pd(oldsk
, NULL
);
6024 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
) {
6025 sctp_sock_rfree_frag(skb
);
6026 sctp_skb_set_owner_r_frag(skb
, newsk
);
6029 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
) {
6030 sctp_sock_rfree_frag(skb
);
6031 sctp_skb_set_owner_r_frag(skb
, newsk
);
6034 /* Set the type of socket to indicate that it is peeled off from the
6035 * original UDP-style socket or created with the accept() call on a
6036 * TCP-style socket..
6040 /* Mark the new socket "in-use" by the user so that any packets
6041 * that may arrive on the association after we've moved it are
6042 * queued to the backlog. This prevents a potential race between
6043 * backlog processing on the old socket and new-packet processing
6044 * on the new socket.
6046 sctp_lock_sock(newsk
);
6047 sctp_assoc_migrate(assoc
, newsk
);
6049 /* If the association on the newsk is already closed before accept()
6050 * is called, set RCV_SHUTDOWN flag.
6052 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
6053 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
6055 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
6056 sctp_release_sock(newsk
);
6059 /* This proto struct describes the ULP interface for SCTP. */
6060 struct proto sctp_prot
= {
6062 .owner
= THIS_MODULE
,
6063 .close
= sctp_close
,
6064 .connect
= sctp_connect
,
6065 .disconnect
= sctp_disconnect
,
6066 .accept
= sctp_accept
,
6067 .ioctl
= sctp_ioctl
,
6068 .init
= sctp_init_sock
,
6069 .destroy
= sctp_destroy_sock
,
6070 .shutdown
= sctp_shutdown
,
6071 .setsockopt
= sctp_setsockopt
,
6072 .getsockopt
= sctp_getsockopt
,
6073 .sendmsg
= sctp_sendmsg
,
6074 .recvmsg
= sctp_recvmsg
,
6076 .backlog_rcv
= sctp_backlog_rcv
,
6078 .unhash
= sctp_unhash
,
6079 .get_port
= sctp_get_port
,
6080 .obj_size
= sizeof(struct sctp_sock
),
6083 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6084 struct proto sctpv6_prot
= {
6086 .owner
= THIS_MODULE
,
6087 .close
= sctp_close
,
6088 .connect
= sctp_connect
,
6089 .disconnect
= sctp_disconnect
,
6090 .accept
= sctp_accept
,
6091 .ioctl
= sctp_ioctl
,
6092 .init
= sctp_init_sock
,
6093 .destroy
= sctp_destroy_sock
,
6094 .shutdown
= sctp_shutdown
,
6095 .setsockopt
= sctp_setsockopt
,
6096 .getsockopt
= sctp_getsockopt
,
6097 .sendmsg
= sctp_sendmsg
,
6098 .recvmsg
= sctp_recvmsg
,
6100 .backlog_rcv
= sctp_backlog_rcv
,
6102 .unhash
= sctp_unhash
,
6103 .get_port
= sctp_get_port
,
6104 .obj_size
= sizeof(struct sctp6_sock
),
6106 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */