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/config.h>
61 #include <linux/types.h>
62 #include <linux/kernel.h>
63 #include <linux/wait.h>
64 #include <linux/time.h>
66 #include <linux/fcntl.h>
67 #include <linux/poll.h>
68 #include <linux/init.h>
69 #include <linux/crypto.h>
73 #include <net/route.h>
75 #include <net/inet_common.h>
77 #include <linux/socket.h> /* for sa_family_t */
79 #include <net/sctp/sctp.h>
80 #include <net/sctp/sm.h>
82 /* WARNING: Please do not remove the SCTP_STATIC attribute to
83 * any of the functions below as they are used to export functions
84 * used by a project regression testsuite.
87 /* Forward declarations for internal helper functions. */
88 static int sctp_writeable(struct sock
*sk
);
89 static void sctp_wfree(struct sk_buff
*skb
);
90 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
92 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
);
93 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
94 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
95 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
96 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
97 union sctp_addr
*addr
, int len
);
98 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
99 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
100 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
101 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
102 static int sctp_send_asconf(struct sctp_association
*asoc
,
103 struct sctp_chunk
*chunk
);
104 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
105 static int sctp_autobind(struct sock
*sk
);
106 static void sctp_sock_migrate(struct sock
*, struct sock
*,
107 struct sctp_association
*, sctp_socket_type_t
);
108 static char *sctp_hmac_alg
= SCTP_COOKIE_HMAC_ALG
;
110 extern kmem_cache_t
*sctp_bucket_cachep
;
112 /* Get the sndbuf space available at the time on the association. */
113 static inline int sctp_wspace(struct sctp_association
*asoc
)
115 struct sock
*sk
= asoc
->base
.sk
;
118 if (asoc
->ep
->sndbuf_policy
) {
119 /* make sure that no association uses more than sk_sndbuf */
120 amt
= sk
->sk_sndbuf
- asoc
->sndbuf_used
;
122 /* do socket level accounting */
123 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
132 /* Increment the used sndbuf space count of the corresponding association by
133 * the size of the outgoing data chunk.
134 * Also, set the skb destructor for sndbuf accounting later.
136 * Since it is always 1-1 between chunk and skb, and also a new skb is always
137 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
138 * destructor in the data chunk skb for the purpose of the sndbuf space
141 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
143 struct sctp_association
*asoc
= chunk
->asoc
;
144 struct sock
*sk
= asoc
->base
.sk
;
146 /* The sndbuf space is tracked per association. */
147 sctp_association_hold(asoc
);
149 skb_set_owner_w(chunk
->skb
, sk
);
151 chunk
->skb
->destructor
= sctp_wfree
;
152 /* Save the chunk pointer in skb for sctp_wfree to use later. */
153 *((struct sctp_chunk
**)(chunk
->skb
->cb
)) = chunk
;
155 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
156 sizeof(struct sk_buff
) +
157 sizeof(struct sctp_chunk
);
159 sk
->sk_wmem_queued
+= SCTP_DATA_SNDSIZE(chunk
) +
160 sizeof(struct sk_buff
) +
161 sizeof(struct sctp_chunk
);
163 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
166 /* Verify that this is a valid address. */
167 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
172 /* Verify basic sockaddr. */
173 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
177 /* Is this a valid SCTP address? */
178 if (!af
->addr_valid(addr
, sctp_sk(sk
)))
181 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
187 /* Look up the association by its id. If this is not a UDP-style
188 * socket, the ID field is always ignored.
190 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
192 struct sctp_association
*asoc
= NULL
;
194 /* If this is not a UDP-style socket, assoc id should be ignored. */
195 if (!sctp_style(sk
, UDP
)) {
196 /* Return NULL if the socket state is not ESTABLISHED. It
197 * could be a TCP-style listening socket or a socket which
198 * hasn't yet called connect() to establish an association.
200 if (!sctp_sstate(sk
, ESTABLISHED
))
203 /* Get the first and the only association from the list. */
204 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
205 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
206 struct sctp_association
, asocs
);
210 /* Otherwise this is a UDP-style socket. */
211 if (!id
|| (id
== (sctp_assoc_t
)-1))
214 spin_lock_bh(&sctp_assocs_id_lock
);
215 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
216 spin_unlock_bh(&sctp_assocs_id_lock
);
218 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
224 /* Look up the transport from an address and an assoc id. If both address and
225 * id are specified, the associations matching the address and the id should be
228 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
229 struct sockaddr_storage
*addr
,
232 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
233 struct sctp_transport
*transport
;
234 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
236 laddr
->v4
.sin_port
= ntohs(laddr
->v4
.sin_port
);
237 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
238 (union sctp_addr
*)addr
,
240 laddr
->v4
.sin_port
= htons(laddr
->v4
.sin_port
);
245 id_asoc
= sctp_id2assoc(sk
, id
);
246 if (id_asoc
&& (id_asoc
!= addr_asoc
))
249 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
250 (union sctp_addr
*)addr
);
255 /* API 3.1.2 bind() - UDP Style Syntax
256 * The syntax of bind() is,
258 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
260 * sd - the socket descriptor returned by socket().
261 * addr - the address structure (struct sockaddr_in or struct
262 * sockaddr_in6 [RFC 2553]),
263 * addr_len - the size of the address structure.
265 SCTP_STATIC
int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
271 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
274 /* Disallow binding twice. */
275 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
276 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
281 sctp_release_sock(sk
);
286 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
288 /* Verify this is a valid sockaddr. */
289 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
290 union sctp_addr
*addr
, int len
)
294 /* Check minimum size. */
295 if (len
< sizeof (struct sockaddr
))
298 /* Does this PF support this AF? */
299 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
302 /* If we get this far, af is valid. */
303 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
305 if (len
< af
->sockaddr_len
)
311 /* Bind a local address either to an endpoint or to an association. */
312 SCTP_STATIC
int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
314 struct sctp_sock
*sp
= sctp_sk(sk
);
315 struct sctp_endpoint
*ep
= sp
->ep
;
316 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
321 /* Common sockaddr verification. */
322 af
= sctp_sockaddr_af(sp
, addr
, len
);
324 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
329 snum
= ntohs(addr
->v4
.sin_port
);
331 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
332 ", port: %d, new port: %d, len: %d)\n",
338 /* PF specific bind() address verification. */
339 if (!sp
->pf
->bind_verify(sp
, addr
))
340 return -EADDRNOTAVAIL
;
342 /* We must either be unbound, or bind to the same port. */
343 if (bp
->port
&& (snum
!= bp
->port
)) {
344 SCTP_DEBUG_PRINTK("sctp_do_bind:"
345 " New port %d does not match existing port "
346 "%d.\n", snum
, bp
->port
);
350 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
353 /* Make sure we are allowed to bind here.
354 * The function sctp_get_port_local() does duplicate address
357 if ((ret
= sctp_get_port_local(sk
, addr
))) {
358 if (ret
== (long) sk
) {
359 /* This endpoint has a conflicting address. */
366 /* Refresh ephemeral port. */
368 bp
->port
= inet_sk(sk
)->num
;
370 /* Add the address to the bind address list. */
371 sctp_local_bh_disable();
372 sctp_write_lock(&ep
->base
.addr_lock
);
374 /* Use GFP_ATOMIC since BHs are disabled. */
375 addr
->v4
.sin_port
= ntohs(addr
->v4
.sin_port
);
376 ret
= sctp_add_bind_addr(bp
, addr
, GFP_ATOMIC
);
377 addr
->v4
.sin_port
= htons(addr
->v4
.sin_port
);
378 sctp_write_unlock(&ep
->base
.addr_lock
);
379 sctp_local_bh_enable();
381 /* Copy back into socket for getsockname() use. */
383 inet_sk(sk
)->sport
= htons(inet_sk(sk
)->num
);
384 af
->to_sk_saddr(addr
, sk
);
390 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
392 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
393 * at any one time. If a sender, after sending an ASCONF chunk, decides
394 * it needs to transfer another ASCONF Chunk, it MUST wait until the
395 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
396 * subsequent ASCONF. Note this restriction binds each side, so at any
397 * time two ASCONF may be in-transit on any given association (one sent
398 * from each endpoint).
400 static int sctp_send_asconf(struct sctp_association
*asoc
,
401 struct sctp_chunk
*chunk
)
405 /* If there is an outstanding ASCONF chunk, queue it for later
408 if (asoc
->addip_last_asconf
) {
409 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
413 /* Hold the chunk until an ASCONF_ACK is received. */
414 sctp_chunk_hold(chunk
);
415 retval
= sctp_primitive_ASCONF(asoc
, chunk
);
417 sctp_chunk_free(chunk
);
419 asoc
->addip_last_asconf
= chunk
;
425 /* Add a list of addresses as bind addresses to local endpoint or
428 * Basically run through each address specified in the addrs/addrcnt
429 * array/length pair, determine if it is IPv6 or IPv4 and call
430 * sctp_do_bind() on it.
432 * If any of them fails, then the operation will be reversed and the
433 * ones that were added will be removed.
435 * Only sctp_setsockopt_bindx() is supposed to call this function.
437 int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
442 struct sockaddr
*sa_addr
;
445 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
449 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
450 /* The list may contain either IPv4 or IPv6 address;
451 * determine the address length for walking thru the list.
453 sa_addr
= (struct sockaddr
*)addr_buf
;
454 af
= sctp_get_af_specific(sa_addr
->sa_family
);
460 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
463 addr_buf
+= af
->sockaddr_len
;
467 /* Failed. Cleanup the ones that have been added */
469 sctp_bindx_rem(sk
, addrs
, cnt
);
477 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
478 * associations that are part of the endpoint indicating that a list of local
479 * addresses are added to the endpoint.
481 * If any of the addresses is already in the bind address list of the
482 * association, we do not send the chunk for that association. But it will not
483 * affect other associations.
485 * Only sctp_setsockopt_bindx() is supposed to call this function.
487 static int sctp_send_asconf_add_ip(struct sock
*sk
,
488 struct sockaddr
*addrs
,
491 struct sctp_sock
*sp
;
492 struct sctp_endpoint
*ep
;
493 struct sctp_association
*asoc
;
494 struct sctp_bind_addr
*bp
;
495 struct sctp_chunk
*chunk
;
496 struct sctp_sockaddr_entry
*laddr
;
497 union sctp_addr
*addr
;
500 struct list_head
*pos
;
505 if (!sctp_addip_enable
)
511 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
512 __FUNCTION__
, sk
, addrs
, addrcnt
);
514 list_for_each(pos
, &ep
->asocs
) {
515 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
517 if (!asoc
->peer
.asconf_capable
)
520 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
523 if (!sctp_state(asoc
, ESTABLISHED
))
526 /* Check if any address in the packed array of addresses is
527 * in the bind address list of the association. If so,
528 * do not send the asconf chunk to its peer, but continue with
529 * other associations.
532 for (i
= 0; i
< addrcnt
; i
++) {
533 addr
= (union sctp_addr
*)addr_buf
;
534 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
540 if (sctp_assoc_lookup_laddr(asoc
, addr
))
543 addr_buf
+= af
->sockaddr_len
;
548 /* Use the first address in bind addr list of association as
549 * Address Parameter of ASCONF CHUNK.
551 sctp_read_lock(&asoc
->base
.addr_lock
);
552 bp
= &asoc
->base
.bind_addr
;
553 p
= bp
->address_list
.next
;
554 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
555 sctp_read_unlock(&asoc
->base
.addr_lock
);
557 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
558 addrcnt
, SCTP_PARAM_ADD_IP
);
564 retval
= sctp_send_asconf(asoc
, chunk
);
566 /* FIXME: After sending the add address ASCONF chunk, we
567 * cannot append the address to the association's binding
568 * address list, because the new address may be used as the
569 * source of a message sent to the peer before the ASCONF
570 * chunk is received by the peer. So we should wait until
571 * ASCONF_ACK is received.
579 /* Remove a list of addresses from bind addresses list. Do not remove the
582 * Basically run through each address specified in the addrs/addrcnt
583 * array/length pair, determine if it is IPv6 or IPv4 and call
584 * sctp_del_bind() on it.
586 * If any of them fails, then the operation will be reversed and the
587 * ones that were removed will be added back.
589 * At least one address has to be left; if only one address is
590 * available, the operation will return -EBUSY.
592 * Only sctp_setsockopt_bindx() is supposed to call this function.
594 int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
596 struct sctp_sock
*sp
= sctp_sk(sk
);
597 struct sctp_endpoint
*ep
= sp
->ep
;
599 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
601 union sctp_addr saveaddr
;
603 struct sockaddr
*sa_addr
;
606 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
610 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
611 /* If the bind address list is empty or if there is only one
612 * bind address, there is nothing more to be removed (we need
613 * at least one address here).
615 if (list_empty(&bp
->address_list
) ||
616 (sctp_list_single_entry(&bp
->address_list
))) {
621 /* The list may contain either IPv4 or IPv6 address;
622 * determine the address length to copy the address to
625 sa_addr
= (struct sockaddr
*)addr_buf
;
626 af
= sctp_get_af_specific(sa_addr
->sa_family
);
631 memcpy(&saveaddr
, sa_addr
, af
->sockaddr_len
);
632 saveaddr
.v4
.sin_port
= ntohs(saveaddr
.v4
.sin_port
);
633 if (saveaddr
.v4
.sin_port
!= bp
->port
) {
638 /* FIXME - There is probably a need to check if sk->sk_saddr and
639 * sk->sk_rcv_addr are currently set to one of the addresses to
640 * be removed. This is something which needs to be looked into
641 * when we are fixing the outstanding issues with multi-homing
642 * socket routing and failover schemes. Refer to comments in
643 * sctp_do_bind(). -daisy
645 sctp_local_bh_disable();
646 sctp_write_lock(&ep
->base
.addr_lock
);
648 retval
= sctp_del_bind_addr(bp
, &saveaddr
);
650 sctp_write_unlock(&ep
->base
.addr_lock
);
651 sctp_local_bh_enable();
653 addr_buf
+= af
->sockaddr_len
;
656 /* Failed. Add the ones that has been removed back */
658 sctp_bindx_add(sk
, addrs
, cnt
);
666 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
667 * the associations that are part of the endpoint indicating that a list of
668 * local addresses are removed from the endpoint.
670 * If any of the addresses is already in the bind address list of the
671 * association, we do not send the chunk for that association. But it will not
672 * affect other associations.
674 * Only sctp_setsockopt_bindx() is supposed to call this function.
676 static int sctp_send_asconf_del_ip(struct sock
*sk
,
677 struct sockaddr
*addrs
,
680 struct sctp_sock
*sp
;
681 struct sctp_endpoint
*ep
;
682 struct sctp_association
*asoc
;
683 struct sctp_bind_addr
*bp
;
684 struct sctp_chunk
*chunk
;
685 union sctp_addr
*laddr
;
688 struct list_head
*pos
;
692 if (!sctp_addip_enable
)
698 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
699 __FUNCTION__
, sk
, addrs
, addrcnt
);
701 list_for_each(pos
, &ep
->asocs
) {
702 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
704 if (!asoc
->peer
.asconf_capable
)
707 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
710 if (!sctp_state(asoc
, ESTABLISHED
))
713 /* Check if any address in the packed array of addresses is
714 * not present in the bind address list of the association.
715 * If so, do not send the asconf chunk to its peer, but
716 * continue with other associations.
719 for (i
= 0; i
< addrcnt
; i
++) {
720 laddr
= (union sctp_addr
*)addr_buf
;
721 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
727 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
730 addr_buf
+= af
->sockaddr_len
;
735 /* Find one address in the association's bind address list
736 * that is not in the packed array of addresses. This is to
737 * make sure that we do not delete all the addresses in the
740 sctp_read_lock(&asoc
->base
.addr_lock
);
741 bp
= &asoc
->base
.bind_addr
;
742 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
744 sctp_read_unlock(&asoc
->base
.addr_lock
);
748 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
755 retval
= sctp_send_asconf(asoc
, chunk
);
757 /* FIXME: After sending the delete address ASCONF chunk, we
758 * cannot remove the addresses from the association's bind
759 * address list, because there maybe some packet send to
760 * the delete addresses, so we should wait until ASCONF_ACK
761 * packet is received.
768 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
771 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
774 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
775 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
778 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
779 * Section 3.1.2 for this usage.
781 * addrs is a pointer to an array of one or more socket addresses. Each
782 * address is contained in its appropriate structure (i.e. struct
783 * sockaddr_in or struct sockaddr_in6) the family of the address type
784 * must be used to distengish the address length (note that this
785 * representation is termed a "packed array" of addresses). The caller
786 * specifies the number of addresses in the array with addrcnt.
788 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
789 * -1, and sets errno to the appropriate error code.
791 * For SCTP, the port given in each socket address must be the same, or
792 * sctp_bindx() will fail, setting errno to EINVAL.
794 * The flags parameter is formed from the bitwise OR of zero or more of
795 * the following currently defined flags:
797 * SCTP_BINDX_ADD_ADDR
799 * SCTP_BINDX_REM_ADDR
801 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
802 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
803 * addresses from the association. The two flags are mutually exclusive;
804 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
805 * not remove all addresses from an association; sctp_bindx() will
806 * reject such an attempt with EINVAL.
808 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
809 * additional addresses with an endpoint after calling bind(). Or use
810 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
811 * socket is associated with so that no new association accepted will be
812 * associated with those addresses. If the endpoint supports dynamic
813 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
814 * endpoint to send the appropriate message to the peer to change the
815 * peers address lists.
817 * Adding and removing addresses from a connected association is
818 * optional functionality. Implementations that do not support this
819 * functionality should return EOPNOTSUPP.
821 * Basically do nothing but copying the addresses from user to kernel
822 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
823 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
826 * We don't use copy_from_user() for optimization: we first do the
827 * sanity checks (buffer size -fast- and access check-healthy
828 * pointer); if all of those succeed, then we can alloc the memory
829 * (expensive operation) needed to copy the data to kernel. Then we do
830 * the copying without checking the user space area
831 * (__copy_from_user()).
833 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
836 * sk The sk of the socket
837 * addrs The pointer to the addresses in user land
838 * addrssize Size of the addrs buffer
839 * op Operation to perform (add or remove, see the flags of
842 * Returns 0 if ok, <0 errno code on error.
844 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
845 struct sockaddr __user
*addrs
,
846 int addrs_size
, int op
)
848 struct sockaddr
*kaddrs
;
852 struct sockaddr
*sa_addr
;
856 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
857 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
859 if (unlikely(addrs_size
<= 0))
862 /* Check the user passed a healthy pointer. */
863 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
866 /* Alloc space for the address array in kernel memory. */
867 kaddrs
= (struct sockaddr
*)kmalloc(addrs_size
, GFP_KERNEL
);
868 if (unlikely(!kaddrs
))
871 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
876 /* Walk through the addrs buffer and count the number of addresses. */
878 while (walk_size
< addrs_size
) {
879 sa_addr
= (struct sockaddr
*)addr_buf
;
880 af
= sctp_get_af_specific(sa_addr
->sa_family
);
882 /* If the address family is not supported or if this address
883 * causes the address buffer to overflow return EINVAL.
885 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
890 addr_buf
+= af
->sockaddr_len
;
891 walk_size
+= af
->sockaddr_len
;
896 case SCTP_BINDX_ADD_ADDR
:
897 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
900 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
903 case SCTP_BINDX_REM_ADDR
:
904 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
907 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
921 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
923 * Common routine for handling connect() and sctp_connectx().
924 * Connect will come in with just a single address.
926 static int __sctp_connect(struct sock
* sk
,
927 struct sockaddr
*kaddrs
,
930 struct sctp_sock
*sp
;
931 struct sctp_endpoint
*ep
;
932 struct sctp_association
*asoc
= NULL
;
933 struct sctp_association
*asoc2
;
934 struct sctp_transport
*transport
;
942 struct sockaddr
*sa_addr
;
948 /* connect() cannot be done on a socket that is already in ESTABLISHED
949 * state - UDP-style peeled off socket or a TCP-style socket that
950 * is already connected.
951 * It cannot be done even on a TCP-style listening socket.
953 if (sctp_sstate(sk
, ESTABLISHED
) ||
954 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
959 /* Walk through the addrs buffer and count the number of addresses. */
961 while (walk_size
< addrs_size
) {
962 sa_addr
= (struct sockaddr
*)addr_buf
;
963 af
= sctp_get_af_specific(sa_addr
->sa_family
);
965 /* If the address family is not supported or if this address
966 * causes the address buffer to overflow return EINVAL.
968 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
973 err
= sctp_verify_addr(sk
, (union sctp_addr
*)sa_addr
,
978 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
979 to
.v4
.sin_port
= ntohs(to
.v4
.sin_port
);
981 /* Check if there already is a matching association on the
982 * endpoint (other than the one created here).
984 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
985 if (asoc2
&& asoc2
!= asoc
) {
986 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
993 /* If we could not find a matching association on the endpoint,
994 * make sure that there is no peeled-off association matching
995 * the peer address even on another socket.
997 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
998 err
= -EADDRNOTAVAIL
;
1003 /* If a bind() or sctp_bindx() is not called prior to
1004 * an sctp_connectx() call, the system picks an
1005 * ephemeral port and will choose an address set
1006 * equivalent to binding with a wildcard address.
1008 if (!ep
->base
.bind_addr
.port
) {
1009 if (sctp_autobind(sk
)) {
1015 scope
= sctp_scope(&to
);
1016 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1023 /* Prime the peer's transport structures. */
1024 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1032 addr_buf
+= af
->sockaddr_len
;
1033 walk_size
+= af
->sockaddr_len
;
1036 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1041 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1046 /* Initialize sk's dport and daddr for getpeername() */
1047 inet_sk(sk
)->dport
= htons(asoc
->peer
.port
);
1048 af
= sctp_get_af_specific(to
.sa
.sa_family
);
1049 af
->to_sk_daddr(&to
, sk
);
1051 timeo
= sock_sndtimeo(sk
, sk
->sk_socket
->file
->f_flags
& O_NONBLOCK
);
1052 err
= sctp_wait_for_connect(asoc
, &timeo
);
1054 /* Don't free association on exit. */
1059 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1060 " kaddrs: %p err: %d\n",
1063 sctp_association_free(asoc
);
1067 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1070 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
1072 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1073 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1074 * or IPv6 addresses.
1076 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1077 * Section 3.1.2 for this usage.
1079 * addrs is a pointer to an array of one or more socket addresses. Each
1080 * address is contained in its appropriate structure (i.e. struct
1081 * sockaddr_in or struct sockaddr_in6) the family of the address type
1082 * must be used to distengish the address length (note that this
1083 * representation is termed a "packed array" of addresses). The caller
1084 * specifies the number of addresses in the array with addrcnt.
1086 * On success, sctp_connectx() returns 0. On failure, sctp_connectx() returns
1087 * -1, and sets errno to the appropriate error code.
1089 * For SCTP, the port given in each socket address must be the same, or
1090 * sctp_connectx() will fail, setting errno to EINVAL.
1092 * An application can use sctp_connectx to initiate an association with
1093 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1094 * allows a caller to specify multiple addresses at which a peer can be
1095 * reached. The way the SCTP stack uses the list of addresses to set up
1096 * the association is implementation dependant. This function only
1097 * specifies that the stack will try to make use of all the addresses in
1098 * the list when needed.
1100 * Note that the list of addresses passed in is only used for setting up
1101 * the association. It does not necessarily equal the set of addresses
1102 * the peer uses for the resulting association. If the caller wants to
1103 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1104 * retrieve them after the association has been set up.
1106 * Basically do nothing but copying the addresses from user to kernel
1107 * land and invoking either sctp_connectx(). This is used for tunneling
1108 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1110 * We don't use copy_from_user() for optimization: we first do the
1111 * sanity checks (buffer size -fast- and access check-healthy
1112 * pointer); if all of those succeed, then we can alloc the memory
1113 * (expensive operation) needed to copy the data to kernel. Then we do
1114 * the copying without checking the user space area
1115 * (__copy_from_user()).
1117 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1120 * sk The sk of the socket
1121 * addrs The pointer to the addresses in user land
1122 * addrssize Size of the addrs buffer
1124 * Returns 0 if ok, <0 errno code on error.
1126 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1127 struct sockaddr __user
*addrs
,
1131 struct sockaddr
*kaddrs
;
1133 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1134 __FUNCTION__
, sk
, addrs
, addrs_size
);
1136 if (unlikely(addrs_size
<= 0))
1139 /* Check the user passed a healthy pointer. */
1140 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1143 /* Alloc space for the address array in kernel memory. */
1144 kaddrs
= (struct sockaddr
*)kmalloc(addrs_size
, GFP_KERNEL
);
1145 if (unlikely(!kaddrs
))
1148 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1151 err
= __sctp_connect(sk
, kaddrs
, addrs_size
);
1158 /* API 3.1.4 close() - UDP Style Syntax
1159 * Applications use close() to perform graceful shutdown (as described in
1160 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1161 * by a UDP-style socket.
1165 * ret = close(int sd);
1167 * sd - the socket descriptor of the associations to be closed.
1169 * To gracefully shutdown a specific association represented by the
1170 * UDP-style socket, an application should use the sendmsg() call,
1171 * passing no user data, but including the appropriate flag in the
1172 * ancillary data (see Section xxxx).
1174 * If sd in the close() call is a branched-off socket representing only
1175 * one association, the shutdown is performed on that association only.
1177 * 4.1.6 close() - TCP Style Syntax
1179 * Applications use close() to gracefully close down an association.
1183 * int close(int sd);
1185 * sd - the socket descriptor of the association to be closed.
1187 * After an application calls close() on a socket descriptor, no further
1188 * socket operations will succeed on that descriptor.
1190 * API 7.1.4 SO_LINGER
1192 * An application using the TCP-style socket can use this option to
1193 * perform the SCTP ABORT primitive. The linger option structure is:
1196 * int l_onoff; // option on/off
1197 * int l_linger; // linger time
1200 * To enable the option, set l_onoff to 1. If the l_linger value is set
1201 * to 0, calling close() is the same as the ABORT primitive. If the
1202 * value is set to a negative value, the setsockopt() call will return
1203 * an error. If the value is set to a positive value linger_time, the
1204 * close() can be blocked for at most linger_time ms. If the graceful
1205 * shutdown phase does not finish during this period, close() will
1206 * return but the graceful shutdown phase continues in the system.
1208 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1210 struct sctp_endpoint
*ep
;
1211 struct sctp_association
*asoc
;
1212 struct list_head
*pos
, *temp
;
1214 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1217 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1219 ep
= sctp_sk(sk
)->ep
;
1221 /* Walk all associations on a socket, not on an endpoint. */
1222 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1223 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1225 if (sctp_style(sk
, TCP
)) {
1226 /* A closed association can still be in the list if
1227 * it belongs to a TCP-style listening socket that is
1228 * not yet accepted. If so, free it. If not, send an
1229 * ABORT or SHUTDOWN based on the linger options.
1231 if (sctp_state(asoc
, CLOSED
)) {
1232 sctp_unhash_established(asoc
);
1233 sctp_association_free(asoc
);
1235 } else if (sock_flag(sk
, SOCK_LINGER
) &&
1237 sctp_primitive_ABORT(asoc
, NULL
);
1239 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1241 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1244 /* Clean up any skbs sitting on the receive queue. */
1245 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1246 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1248 /* On a TCP-style socket, block for at most linger_time if set. */
1249 if (sctp_style(sk
, TCP
) && timeout
)
1250 sctp_wait_for_close(sk
, timeout
);
1252 /* This will run the backlog queue. */
1253 sctp_release_sock(sk
);
1255 /* Supposedly, no process has access to the socket, but
1256 * the net layers still may.
1258 sctp_local_bh_disable();
1259 sctp_bh_lock_sock(sk
);
1261 /* Hold the sock, since sk_common_release() will put sock_put()
1262 * and we have just a little more cleanup.
1265 sk_common_release(sk
);
1267 sctp_bh_unlock_sock(sk
);
1268 sctp_local_bh_enable();
1272 SCTP_DBG_OBJCNT_DEC(sock
);
1275 /* Handle EPIPE error. */
1276 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1279 err
= sock_error(sk
) ? : -EPIPE
;
1280 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1281 send_sig(SIGPIPE
, current
, 0);
1285 /* API 3.1.3 sendmsg() - UDP Style Syntax
1287 * An application uses sendmsg() and recvmsg() calls to transmit data to
1288 * and receive data from its peer.
1290 * ssize_t sendmsg(int socket, const struct msghdr *message,
1293 * socket - the socket descriptor of the endpoint.
1294 * message - pointer to the msghdr structure which contains a single
1295 * user message and possibly some ancillary data.
1297 * See Section 5 for complete description of the data
1300 * flags - flags sent or received with the user message, see Section
1301 * 5 for complete description of the flags.
1303 * Note: This function could use a rewrite especially when explicit
1304 * connect support comes in.
1306 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1308 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1310 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1311 struct msghdr
*msg
, size_t msg_len
)
1313 struct sctp_sock
*sp
;
1314 struct sctp_endpoint
*ep
;
1315 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1316 struct sctp_transport
*transport
, *chunk_tp
;
1317 struct sctp_chunk
*chunk
;
1319 struct sockaddr
*msg_name
= NULL
;
1320 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1321 struct sctp_sndrcvinfo
*sinfo
;
1322 struct sctp_initmsg
*sinit
;
1323 sctp_assoc_t associd
= 0;
1324 sctp_cmsgs_t cmsgs
= { NULL
};
1328 __u16 sinfo_flags
= 0;
1329 struct sctp_datamsg
*datamsg
;
1330 struct list_head
*pos
;
1331 int msg_flags
= msg
->msg_flags
;
1333 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1340 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1342 /* We cannot send a message over a TCP-style listening socket. */
1343 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1348 /* Parse out the SCTP CMSGs. */
1349 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1352 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1356 /* Fetch the destination address for this packet. This
1357 * address only selects the association--it is not necessarily
1358 * the address we will send to.
1359 * For a peeled-off socket, msg_name is ignored.
1361 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1362 int msg_namelen
= msg
->msg_namelen
;
1364 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1369 if (msg_namelen
> sizeof(to
))
1370 msg_namelen
= sizeof(to
);
1371 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1372 SCTP_DEBUG_PRINTK("Just memcpy'd. msg_name is "
1374 to
.v4
.sin_addr
.s_addr
, to
.v4
.sin_port
);
1376 to
.v4
.sin_port
= ntohs(to
.v4
.sin_port
);
1377 msg_name
= msg
->msg_name
;
1383 /* Did the user specify SNDRCVINFO? */
1385 sinfo_flags
= sinfo
->sinfo_flags
;
1386 associd
= sinfo
->sinfo_assoc_id
;
1389 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1390 msg_len
, sinfo_flags
);
1392 /* MSG_EOF or MSG_ABORT cannot be set on a TCP-style socket. */
1393 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (MSG_EOF
| MSG_ABORT
))) {
1398 /* If MSG_EOF is set, no data can be sent. Disallow sending zero
1399 * length messages when MSG_EOF|MSG_ABORT is not set.
1400 * If MSG_ABORT is set, the message length could be non zero with
1401 * the msg_iov set to the user abort reason.
1403 if (((sinfo_flags
& MSG_EOF
) && (msg_len
> 0)) ||
1404 (!(sinfo_flags
& (MSG_EOF
|MSG_ABORT
)) && (msg_len
== 0))) {
1409 /* If MSG_ADDR_OVER is set, there must be an address
1410 * specified in msg_name.
1412 if ((sinfo_flags
& MSG_ADDR_OVER
) && (!msg
->msg_name
)) {
1419 SCTP_DEBUG_PRINTK("About to look up association.\n");
1423 /* If a msg_name has been specified, assume this is to be used. */
1425 /* Look for a matching association on the endpoint. */
1426 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1428 /* If we could not find a matching association on the
1429 * endpoint, make sure that it is not a TCP-style
1430 * socket that already has an association or there is
1431 * no peeled-off association on another socket.
1433 if ((sctp_style(sk
, TCP
) &&
1434 sctp_sstate(sk
, ESTABLISHED
)) ||
1435 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1436 err
= -EADDRNOTAVAIL
;
1441 asoc
= sctp_id2assoc(sk
, associd
);
1449 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1451 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1452 * socket that has an association in CLOSED state. This can
1453 * happen when an accepted socket has an association that is
1456 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1461 if (sinfo_flags
& MSG_EOF
) {
1462 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1464 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1468 if (sinfo_flags
& MSG_ABORT
) {
1469 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1470 sctp_primitive_ABORT(asoc
, msg
);
1476 /* Do we need to create the association? */
1478 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1480 if (sinfo_flags
& (MSG_EOF
| MSG_ABORT
)) {
1485 /* Check for invalid stream against the stream counts,
1486 * either the default or the user specified stream counts.
1489 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1490 /* Check against the defaults. */
1491 if (sinfo
->sinfo_stream
>=
1492 sp
->initmsg
.sinit_num_ostreams
) {
1497 /* Check against the requested. */
1498 if (sinfo
->sinfo_stream
>=
1499 sinit
->sinit_num_ostreams
) {
1507 * API 3.1.2 bind() - UDP Style Syntax
1508 * If a bind() or sctp_bindx() is not called prior to a
1509 * sendmsg() call that initiates a new association, the
1510 * system picks an ephemeral port and will choose an address
1511 * set equivalent to binding with a wildcard address.
1513 if (!ep
->base
.bind_addr
.port
) {
1514 if (sctp_autobind(sk
)) {
1520 scope
= sctp_scope(&to
);
1521 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1528 /* If the SCTP_INIT ancillary data is specified, set all
1529 * the association init values accordingly.
1532 if (sinit
->sinit_num_ostreams
) {
1533 asoc
->c
.sinit_num_ostreams
=
1534 sinit
->sinit_num_ostreams
;
1536 if (sinit
->sinit_max_instreams
) {
1537 asoc
->c
.sinit_max_instreams
=
1538 sinit
->sinit_max_instreams
;
1540 if (sinit
->sinit_max_attempts
) {
1541 asoc
->max_init_attempts
1542 = sinit
->sinit_max_attempts
;
1544 if (sinit
->sinit_max_init_timeo
) {
1545 asoc
->max_init_timeo
=
1546 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1550 /* Prime the peer's transport structures. */
1551 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1556 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1563 /* ASSERT: we have a valid association at this point. */
1564 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1567 /* If the user didn't specify SNDRCVINFO, make up one with
1570 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1571 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1572 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1573 default_sinfo
.sinfo_context
= asoc
->default_context
;
1574 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1575 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1576 sinfo
= &default_sinfo
;
1579 /* API 7.1.7, the sndbuf size per association bounds the
1580 * maximum size of data that can be sent in a single send call.
1582 if (msg_len
> sk
->sk_sndbuf
) {
1587 /* If fragmentation is disabled and the message length exceeds the
1588 * association fragmentation point, return EMSGSIZE. The I-D
1589 * does not specify what this error is, but this looks like
1592 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1598 /* Check for invalid stream. */
1599 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1605 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1606 if (!sctp_wspace(asoc
)) {
1607 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1612 /* If an address is passed with the sendto/sendmsg call, it is used
1613 * to override the primary destination address in the TCP model, or
1614 * when MSG_ADDR_OVER flag is set in the UDP model.
1616 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1617 (sinfo_flags
& MSG_ADDR_OVER
)) {
1618 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1626 /* Auto-connect, if we aren't connected already. */
1627 if (sctp_state(asoc
, CLOSED
)) {
1628 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1631 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1634 /* Break the message into multiple chunks of maximum size. */
1635 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1641 /* Now send the (possibly) fragmented message. */
1642 list_for_each(pos
, &datamsg
->chunks
) {
1643 chunk
= list_entry(pos
, struct sctp_chunk
, frag_list
);
1644 sctp_datamsg_track(chunk
);
1646 /* Do accounting for the write space. */
1647 sctp_set_owner_w(chunk
);
1649 chunk
->transport
= chunk_tp
;
1651 /* Send it to the lower layers. Note: all chunks
1652 * must either fail or succeed. The lower layer
1653 * works that way today. Keep it that way or this
1656 err
= sctp_primitive_SEND(asoc
, chunk
);
1657 /* Did the lower layer accept the chunk? */
1659 sctp_chunk_free(chunk
);
1660 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1663 sctp_datamsg_free(datamsg
);
1669 /* If we are already past ASSOCIATE, the lower
1670 * layers are responsible for association cleanup.
1676 sctp_association_free(asoc
);
1678 sctp_release_sock(sk
);
1681 return sctp_error(sk
, msg_flags
, err
);
1688 err
= sock_error(sk
);
1698 /* This is an extended version of skb_pull() that removes the data from the
1699 * start of a skb even when data is spread across the list of skb's in the
1700 * frag_list. len specifies the total amount of data that needs to be removed.
1701 * when 'len' bytes could be removed from the skb, it returns 0.
1702 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1703 * could not be removed.
1705 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1707 struct sk_buff
*list
;
1708 int skb_len
= skb_headlen(skb
);
1711 if (len
<= skb_len
) {
1712 __skb_pull(skb
, len
);
1716 __skb_pull(skb
, skb_len
);
1718 for (list
= skb_shinfo(skb
)->frag_list
; list
; list
= list
->next
) {
1719 rlen
= sctp_skb_pull(list
, len
);
1720 skb
->len
-= (len
-rlen
);
1721 skb
->data_len
-= (len
-rlen
);
1732 /* API 3.1.3 recvmsg() - UDP Style Syntax
1734 * ssize_t recvmsg(int socket, struct msghdr *message,
1737 * socket - the socket descriptor of the endpoint.
1738 * message - pointer to the msghdr structure which contains a single
1739 * user message and possibly some ancillary data.
1741 * See Section 5 for complete description of the data
1744 * flags - flags sent or received with the user message, see Section
1745 * 5 for complete description of the flags.
1747 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1749 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1750 struct msghdr
*msg
, size_t len
, int noblock
,
1751 int flags
, int *addr_len
)
1753 struct sctp_ulpevent
*event
= NULL
;
1754 struct sctp_sock
*sp
= sctp_sk(sk
);
1755 struct sk_buff
*skb
;
1760 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1761 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1762 "len", len
, "knoblauch", noblock
,
1763 "flags", flags
, "addr_len", addr_len
);
1767 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1772 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1776 /* Get the total length of the skb including any skb's in the
1785 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1787 event
= sctp_skb2event(skb
);
1792 sock_recv_timestamp(msg
, sk
, skb
);
1793 if (sctp_ulpevent_is_notification(event
)) {
1794 msg
->msg_flags
|= MSG_NOTIFICATION
;
1795 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1797 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1800 /* Check if we allow SCTP_SNDRCVINFO. */
1801 if (sp
->subscribe
.sctp_data_io_event
)
1802 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1804 /* FIXME: we should be calling IP/IPv6 layers. */
1805 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1806 ip_cmsg_recv(msg
, skb
);
1811 /* If skb's length exceeds the user's buffer, update the skb and
1812 * push it back to the receive_queue so that the next call to
1813 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1815 if (skb_len
> copied
) {
1816 msg
->msg_flags
&= ~MSG_EOR
;
1817 if (flags
& MSG_PEEK
)
1819 sctp_skb_pull(skb
, copied
);
1820 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1822 /* When only partial message is copied to the user, increase
1823 * rwnd by that amount. If all the data in the skb is read,
1824 * rwnd is updated when the event is freed.
1826 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
1828 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
1829 (event
->msg_flags
& MSG_EOR
))
1830 msg
->msg_flags
|= MSG_EOR
;
1832 msg
->msg_flags
&= ~MSG_EOR
;
1835 if (flags
& MSG_PEEK
) {
1836 /* Release the skb reference acquired after peeking the skb in
1837 * sctp_skb_recv_datagram().
1841 /* Free the event which includes releasing the reference to
1842 * the owner of the skb, freeing the skb and updating the
1845 sctp_ulpevent_free(event
);
1848 sctp_release_sock(sk
);
1852 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1854 * This option is a on/off flag. If enabled no SCTP message
1855 * fragmentation will be performed. Instead if a message being sent
1856 * exceeds the current PMTU size, the message will NOT be sent and
1857 * instead a error will be indicated to the user.
1859 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
1860 char __user
*optval
, int optlen
)
1864 if (optlen
< sizeof(int))
1867 if (get_user(val
, (int __user
*)optval
))
1870 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
1875 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
1878 if (optlen
!= sizeof(struct sctp_event_subscribe
))
1880 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
1885 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
1887 * This socket option is applicable to the UDP-style socket only. When
1888 * set it will cause associations that are idle for more than the
1889 * specified number of seconds to automatically close. An association
1890 * being idle is defined an association that has NOT sent or received
1891 * user data. The special value of '0' indicates that no automatic
1892 * close of any associations should be performed. The option expects an
1893 * integer defining the number of seconds of idle time before an
1894 * association is closed.
1896 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
1899 struct sctp_sock
*sp
= sctp_sk(sk
);
1901 /* Applicable to UDP-style socket only */
1902 if (sctp_style(sk
, TCP
))
1904 if (optlen
!= sizeof(int))
1906 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
1909 sp
->ep
->timeouts
[SCTP_EVENT_TIMEOUT_AUTOCLOSE
] = sp
->autoclose
* HZ
;
1913 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
1915 * Applications can enable or disable heartbeats for any peer address of
1916 * an association, modify an address's heartbeat interval, force a
1917 * heartbeat to be sent immediately, and adjust the address's maximum
1918 * number of retransmissions sent before an address is considered
1919 * unreachable. The following structure is used to access and modify an
1920 * address's parameters:
1922 * struct sctp_paddrparams {
1923 * sctp_assoc_t spp_assoc_id;
1924 * struct sockaddr_storage spp_address;
1925 * uint32_t spp_hbinterval;
1926 * uint16_t spp_pathmaxrxt;
1929 * spp_assoc_id - (UDP style socket) This is filled in the application,
1930 * and identifies the association for this query.
1931 * spp_address - This specifies which address is of interest.
1932 * spp_hbinterval - This contains the value of the heartbeat interval,
1933 * in milliseconds. A value of 0, when modifying the
1934 * parameter, specifies that the heartbeat on this
1935 * address should be disabled. A value of UINT32_MAX
1936 * (4294967295), when modifying the parameter,
1937 * specifies that a heartbeat should be sent
1938 * immediately to the peer address, and the current
1939 * interval should remain unchanged.
1940 * spp_pathmaxrxt - This contains the maximum number of
1941 * retransmissions before this address shall be
1942 * considered unreachable.
1944 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
1945 char __user
*optval
, int optlen
)
1947 struct sctp_paddrparams params
;
1948 struct sctp_transport
*trans
;
1951 if (optlen
!= sizeof(struct sctp_paddrparams
))
1953 if (copy_from_user(¶ms
, optval
, optlen
))
1957 * API 7. Socket Options (setting the default value for the endpoint)
1958 * All options that support specific settings on an association by
1959 * filling in either an association id variable or a sockaddr_storage
1960 * SHOULD also support setting of the same value for the entire endpoint
1961 * (i.e. future associations). To accomplish this the following logic is
1962 * used when setting one of these options:
1964 * c) If neither the sockaddr_storage or association identification is
1965 * set i.e. the sockaddr_storage is set to all 0's (INADDR_ANY) and
1966 * the association identification is 0, the settings are a default
1967 * and to be applied to the endpoint (all future associations).
1970 /* update default value for endpoint (all future associations) */
1971 if (!params
.spp_assoc_id
&&
1972 sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
1973 /* Manual heartbeat on an endpoint is invalid. */
1974 if (0xffffffff == params
.spp_hbinterval
)
1976 else if (params
.spp_hbinterval
)
1977 sctp_sk(sk
)->paddrparam
.spp_hbinterval
=
1978 params
.spp_hbinterval
;
1979 if (params
.spp_pathmaxrxt
)
1980 sctp_sk(sk
)->paddrparam
.spp_pathmaxrxt
=
1981 params
.spp_pathmaxrxt
;
1985 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
1986 params
.spp_assoc_id
);
1990 /* Applications can enable or disable heartbeats for any peer address
1991 * of an association, modify an address's heartbeat interval, force a
1992 * heartbeat to be sent immediately, and adjust the address's maximum
1993 * number of retransmissions sent before an address is considered
1996 * The value of the heartbeat interval, in milliseconds. A value of
1997 * UINT32_MAX (4294967295), when modifying the parameter, specifies
1998 * that a heartbeat should be sent immediately to the peer address,
1999 * and the current interval should remain unchanged.
2001 if (0xffffffff == params
.spp_hbinterval
) {
2002 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2006 /* The value of the heartbeat interval, in milliseconds. A value of 0,
2007 * when modifying the parameter, specifies that the heartbeat on this
2008 * address should be disabled.
2010 if (params
.spp_hbinterval
) {
2011 trans
->hb_allowed
= 1;
2012 trans
->hb_interval
=
2013 msecs_to_jiffies(params
.spp_hbinterval
);
2015 trans
->hb_allowed
= 0;
2018 /* spp_pathmaxrxt contains the maximum number of retransmissions
2019 * before this address shall be considered unreachable.
2021 if (params
.spp_pathmaxrxt
)
2022 trans
->max_retrans
= params
.spp_pathmaxrxt
;
2027 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2029 * Applications can specify protocol parameters for the default association
2030 * initialization. The option name argument to setsockopt() and getsockopt()
2033 * Setting initialization parameters is effective only on an unconnected
2034 * socket (for UDP-style sockets only future associations are effected
2035 * by the change). With TCP-style sockets, this option is inherited by
2036 * sockets derived from a listener socket.
2038 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, int optlen
)
2040 struct sctp_initmsg sinit
;
2041 struct sctp_sock
*sp
= sctp_sk(sk
);
2043 if (optlen
!= sizeof(struct sctp_initmsg
))
2045 if (copy_from_user(&sinit
, optval
, optlen
))
2048 if (sinit
.sinit_num_ostreams
)
2049 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2050 if (sinit
.sinit_max_instreams
)
2051 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2052 if (sinit
.sinit_max_attempts
)
2053 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2054 if (sinit
.sinit_max_init_timeo
)
2055 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2061 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2063 * Applications that wish to use the sendto() system call may wish to
2064 * specify a default set of parameters that would normally be supplied
2065 * through the inclusion of ancillary data. This socket option allows
2066 * such an application to set the default sctp_sndrcvinfo structure.
2067 * The application that wishes to use this socket option simply passes
2068 * in to this call the sctp_sndrcvinfo structure defined in Section
2069 * 5.2.2) The input parameters accepted by this call include
2070 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2071 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2072 * to this call if the caller is using the UDP model.
2074 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2075 char __user
*optval
, int optlen
)
2077 struct sctp_sndrcvinfo info
;
2078 struct sctp_association
*asoc
;
2079 struct sctp_sock
*sp
= sctp_sk(sk
);
2081 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2083 if (copy_from_user(&info
, optval
, optlen
))
2086 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2087 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2091 asoc
->default_stream
= info
.sinfo_stream
;
2092 asoc
->default_flags
= info
.sinfo_flags
;
2093 asoc
->default_ppid
= info
.sinfo_ppid
;
2094 asoc
->default_context
= info
.sinfo_context
;
2095 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2097 sp
->default_stream
= info
.sinfo_stream
;
2098 sp
->default_flags
= info
.sinfo_flags
;
2099 sp
->default_ppid
= info
.sinfo_ppid
;
2100 sp
->default_context
= info
.sinfo_context
;
2101 sp
->default_timetolive
= info
.sinfo_timetolive
;
2107 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2109 * Requests that the local SCTP stack use the enclosed peer address as
2110 * the association primary. The enclosed address must be one of the
2111 * association peer's addresses.
2113 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2116 struct sctp_prim prim
;
2117 struct sctp_transport
*trans
;
2119 if (optlen
!= sizeof(struct sctp_prim
))
2122 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2125 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2129 sctp_assoc_set_primary(trans
->asoc
, trans
);
2135 * 7.1.5 SCTP_NODELAY
2137 * Turn on/off any Nagle-like algorithm. This means that packets are
2138 * generally sent as soon as possible and no unnecessary delays are
2139 * introduced, at the cost of more packets in the network. Expects an
2140 * integer boolean flag.
2142 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2147 if (optlen
< sizeof(int))
2149 if (get_user(val
, (int __user
*)optval
))
2152 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2158 * 7.1.1 SCTP_RTOINFO
2160 * The protocol parameters used to initialize and bound retransmission
2161 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2162 * and modify these parameters.
2163 * All parameters are time values, in milliseconds. A value of 0, when
2164 * modifying the parameters, indicates that the current value should not
2168 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, int optlen
) {
2169 struct sctp_rtoinfo rtoinfo
;
2170 struct sctp_association
*asoc
;
2172 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2175 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2178 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2180 /* Set the values to the specific association */
2181 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2185 if (rtoinfo
.srto_initial
!= 0)
2187 msecs_to_jiffies(rtoinfo
.srto_initial
);
2188 if (rtoinfo
.srto_max
!= 0)
2189 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2190 if (rtoinfo
.srto_min
!= 0)
2191 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2193 /* If there is no association or the association-id = 0
2194 * set the values to the endpoint.
2196 struct sctp_sock
*sp
= sctp_sk(sk
);
2198 if (rtoinfo
.srto_initial
!= 0)
2199 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2200 if (rtoinfo
.srto_max
!= 0)
2201 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2202 if (rtoinfo
.srto_min
!= 0)
2203 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2211 * 7.1.2 SCTP_ASSOCINFO
2213 * This option is used to tune the the maximum retransmission attempts
2214 * of the association.
2215 * Returns an error if the new association retransmission value is
2216 * greater than the sum of the retransmission value of the peer.
2217 * See [SCTP] for more information.
2220 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, int optlen
)
2223 struct sctp_assocparams assocparams
;
2224 struct sctp_association
*asoc
;
2226 if (optlen
!= sizeof(struct sctp_assocparams
))
2228 if (copy_from_user(&assocparams
, optval
, optlen
))
2231 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2233 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2236 /* Set the values to the specific association */
2238 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2239 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2240 if (assocparams
.sasoc_cookie_life
!= 0) {
2241 asoc
->cookie_life
.tv_sec
=
2242 assocparams
.sasoc_cookie_life
/ 1000;
2243 asoc
->cookie_life
.tv_usec
=
2244 (assocparams
.sasoc_cookie_life
% 1000)
2248 /* Set the values to the endpoint */
2249 struct sctp_sock
*sp
= sctp_sk(sk
);
2251 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2252 sp
->assocparams
.sasoc_asocmaxrxt
=
2253 assocparams
.sasoc_asocmaxrxt
;
2254 if (assocparams
.sasoc_cookie_life
!= 0)
2255 sp
->assocparams
.sasoc_cookie_life
=
2256 assocparams
.sasoc_cookie_life
;
2262 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2264 * This socket option is a boolean flag which turns on or off mapped V4
2265 * addresses. If this option is turned on and the socket is type
2266 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2267 * If this option is turned off, then no mapping will be done of V4
2268 * addresses and a user will receive both PF_INET6 and PF_INET type
2269 * addresses on the socket.
2271 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, int optlen
)
2274 struct sctp_sock
*sp
= sctp_sk(sk
);
2276 if (optlen
< sizeof(int))
2278 if (get_user(val
, (int __user
*)optval
))
2289 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2291 * This socket option specifies the maximum size to put in any outgoing
2292 * SCTP chunk. If a message is larger than this size it will be
2293 * fragmented by SCTP into the specified size. Note that the underlying
2294 * SCTP implementation may fragment into smaller sized chunks when the
2295 * PMTU of the underlying association is smaller than the value set by
2298 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, int optlen
)
2300 struct sctp_association
*asoc
;
2301 struct list_head
*pos
;
2302 struct sctp_sock
*sp
= sctp_sk(sk
);
2305 if (optlen
< sizeof(int))
2307 if (get_user(val
, (int __user
*)optval
))
2309 if ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
))
2311 sp
->user_frag
= val
;
2314 /* Update the frag_point of the existing associations. */
2315 list_for_each(pos
, &(sp
->ep
->asocs
)) {
2316 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
2317 asoc
->frag_point
= sctp_frag_point(sp
, asoc
->pmtu
);
2326 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2328 * Requests that the peer mark the enclosed address as the association
2329 * primary. The enclosed address must be one of the association's
2330 * locally bound addresses. The following structure is used to make a
2331 * set primary request:
2333 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2336 struct sctp_sock
*sp
;
2337 struct sctp_endpoint
*ep
;
2338 struct sctp_association
*asoc
= NULL
;
2339 struct sctp_setpeerprim prim
;
2340 struct sctp_chunk
*chunk
;
2346 if (!sctp_addip_enable
)
2349 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2352 if (copy_from_user(&prim
, optval
, optlen
))
2355 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2359 if (!asoc
->peer
.asconf_capable
)
2362 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2365 if (!sctp_state(asoc
, ESTABLISHED
))
2368 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2369 return -EADDRNOTAVAIL
;
2371 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2372 chunk
= sctp_make_asconf_set_prim(asoc
,
2373 (union sctp_addr
*)&prim
.sspp_addr
);
2377 err
= sctp_send_asconf(asoc
, chunk
);
2379 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2384 static int sctp_setsockopt_adaption_layer(struct sock
*sk
, char __user
*optval
,
2389 if (optlen
< sizeof(__u32
))
2391 if (copy_from_user(&val
, optval
, sizeof(__u32
)))
2394 sctp_sk(sk
)->adaption_ind
= val
;
2399 /* API 6.2 setsockopt(), getsockopt()
2401 * Applications use setsockopt() and getsockopt() to set or retrieve
2402 * socket options. Socket options are used to change the default
2403 * behavior of sockets calls. They are described in Section 7.
2407 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
2408 * int __user *optlen);
2409 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
2412 * sd - the socket descript.
2413 * level - set to IPPROTO_SCTP for all SCTP options.
2414 * optname - the option name.
2415 * optval - the buffer to store the value of the option.
2416 * optlen - the size of the buffer.
2418 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
2419 char __user
*optval
, int optlen
)
2423 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
2426 /* I can hardly begin to describe how wrong this is. This is
2427 * so broken as to be worse than useless. The API draft
2428 * REALLY is NOT helpful here... I am not convinced that the
2429 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
2430 * are at all well-founded.
2432 if (level
!= SOL_SCTP
) {
2433 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
2434 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2441 case SCTP_SOCKOPT_BINDX_ADD
:
2442 /* 'optlen' is the size of the addresses buffer. */
2443 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2444 optlen
, SCTP_BINDX_ADD_ADDR
);
2447 case SCTP_SOCKOPT_BINDX_REM
:
2448 /* 'optlen' is the size of the addresses buffer. */
2449 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2450 optlen
, SCTP_BINDX_REM_ADDR
);
2453 case SCTP_SOCKOPT_CONNECTX
:
2454 /* 'optlen' is the size of the addresses buffer. */
2455 retval
= sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)optval
,
2459 case SCTP_DISABLE_FRAGMENTS
:
2460 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
2464 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
2467 case SCTP_AUTOCLOSE
:
2468 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
2471 case SCTP_PEER_ADDR_PARAMS
:
2472 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
2476 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
2478 case SCTP_DEFAULT_SEND_PARAM
:
2479 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
2482 case SCTP_PRIMARY_ADDR
:
2483 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
2485 case SCTP_SET_PEER_PRIMARY_ADDR
:
2486 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
2489 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
2492 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
2494 case SCTP_ASSOCINFO
:
2495 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
2497 case SCTP_I_WANT_MAPPED_V4_ADDR
:
2498 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
2501 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
2503 case SCTP_ADAPTION_LAYER
:
2504 retval
= sctp_setsockopt_adaption_layer(sk
, optval
, optlen
);
2508 retval
= -ENOPROTOOPT
;
2512 sctp_release_sock(sk
);
2518 /* API 3.1.6 connect() - UDP Style Syntax
2520 * An application may use the connect() call in the UDP model to initiate an
2521 * association without sending data.
2525 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
2527 * sd: the socket descriptor to have a new association added to.
2529 * nam: the address structure (either struct sockaddr_in or struct
2530 * sockaddr_in6 defined in RFC2553 [7]).
2532 * len: the size of the address.
2534 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
2542 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
2543 __FUNCTION__
, sk
, addr
, addr_len
);
2545 /* Validate addr_len before calling common connect/connectx routine. */
2546 af
= sctp_get_af_specific(addr
->sa_family
);
2547 if (!af
|| addr_len
< af
->sockaddr_len
) {
2550 /* Pass correct addr len to common routine (so it knows there
2551 * is only one address being passed.
2553 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
);
2556 sctp_release_sock(sk
);
2560 /* FIXME: Write comments. */
2561 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
2563 return -EOPNOTSUPP
; /* STUB */
2566 /* 4.1.4 accept() - TCP Style Syntax
2568 * Applications use accept() call to remove an established SCTP
2569 * association from the accept queue of the endpoint. A new socket
2570 * descriptor will be returned from accept() to represent the newly
2571 * formed association.
2573 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
2575 struct sctp_sock
*sp
;
2576 struct sctp_endpoint
*ep
;
2577 struct sock
*newsk
= NULL
;
2578 struct sctp_association
*asoc
;
2587 if (!sctp_style(sk
, TCP
)) {
2588 error
= -EOPNOTSUPP
;
2592 if (!sctp_sstate(sk
, LISTENING
)) {
2597 timeo
= sock_rcvtimeo(sk
, sk
->sk_socket
->file
->f_flags
& O_NONBLOCK
);
2599 error
= sctp_wait_for_accept(sk
, timeo
);
2603 /* We treat the list of associations on the endpoint as the accept
2604 * queue and pick the first association on the list.
2606 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
2608 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
2614 /* Populate the fields of the newsk from the oldsk and migrate the
2615 * asoc to the newsk.
2617 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
2620 sctp_release_sock(sk
);
2625 /* The SCTP ioctl handler. */
2626 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
2628 return -ENOIOCTLCMD
;
2631 /* This is the function which gets called during socket creation to
2632 * initialized the SCTP-specific portion of the sock.
2633 * The sock structure should already be zero-filled memory.
2635 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
2637 struct sctp_endpoint
*ep
;
2638 struct sctp_sock
*sp
;
2640 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
2644 /* Initialize the SCTP per socket area. */
2645 switch (sk
->sk_type
) {
2646 case SOCK_SEQPACKET
:
2647 sp
->type
= SCTP_SOCKET_UDP
;
2650 sp
->type
= SCTP_SOCKET_TCP
;
2653 return -ESOCKTNOSUPPORT
;
2656 /* Initialize default send parameters. These parameters can be
2657 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
2659 sp
->default_stream
= 0;
2660 sp
->default_ppid
= 0;
2661 sp
->default_flags
= 0;
2662 sp
->default_context
= 0;
2663 sp
->default_timetolive
= 0;
2665 /* Initialize default setup parameters. These parameters
2666 * can be modified with the SCTP_INITMSG socket option or
2667 * overridden by the SCTP_INIT CMSG.
2669 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
2670 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
2671 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
2672 sp
->initmsg
.sinit_max_init_timeo
= jiffies_to_msecs(sctp_rto_max
);
2674 /* Initialize default RTO related parameters. These parameters can
2675 * be modified for with the SCTP_RTOINFO socket option.
2677 sp
->rtoinfo
.srto_initial
= jiffies_to_msecs(sctp_rto_initial
);
2678 sp
->rtoinfo
.srto_max
= jiffies_to_msecs(sctp_rto_max
);
2679 sp
->rtoinfo
.srto_min
= jiffies_to_msecs(sctp_rto_min
);
2681 /* Initialize default association related parameters. These parameters
2682 * can be modified with the SCTP_ASSOCINFO socket option.
2684 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
2685 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
2686 sp
->assocparams
.sasoc_peer_rwnd
= 0;
2687 sp
->assocparams
.sasoc_local_rwnd
= 0;
2688 sp
->assocparams
.sasoc_cookie_life
=
2689 jiffies_to_msecs(sctp_valid_cookie_life
);
2691 /* Initialize default event subscriptions. By default, all the
2694 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
2696 /* Default Peer Address Parameters. These defaults can
2697 * be modified via SCTP_PEER_ADDR_PARAMS
2699 sp
->paddrparam
.spp_hbinterval
= jiffies_to_msecs(sctp_hb_interval
);
2700 sp
->paddrparam
.spp_pathmaxrxt
= sctp_max_retrans_path
;
2702 /* If enabled no SCTP message fragmentation will be performed.
2703 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
2705 sp
->disable_fragments
= 0;
2707 /* Turn on/off any Nagle-like algorithm. */
2710 /* Enable by default. */
2713 /* Auto-close idle associations after the configured
2714 * number of seconds. A value of 0 disables this
2715 * feature. Configure through the SCTP_AUTOCLOSE socket option,
2716 * for UDP-style sockets only.
2720 /* User specified fragmentation limit. */
2723 sp
->adaption_ind
= 0;
2725 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
2727 /* Control variables for partial data delivery. */
2729 skb_queue_head_init(&sp
->pd_lobby
);
2731 /* Create a per socket endpoint structure. Even if we
2732 * change the data structure relationships, this may still
2733 * be useful for storing pre-connect address information.
2735 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
2742 SCTP_DBG_OBJCNT_INC(sock
);
2746 /* Cleanup any SCTP per socket resources. */
2747 SCTP_STATIC
int sctp_destroy_sock(struct sock
*sk
)
2749 struct sctp_endpoint
*ep
;
2751 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
2753 /* Release our hold on the endpoint. */
2754 ep
= sctp_sk(sk
)->ep
;
2755 sctp_endpoint_free(ep
);
2760 /* API 4.1.7 shutdown() - TCP Style Syntax
2761 * int shutdown(int socket, int how);
2763 * sd - the socket descriptor of the association to be closed.
2764 * how - Specifies the type of shutdown. The values are
2767 * Disables further receive operations. No SCTP
2768 * protocol action is taken.
2770 * Disables further send operations, and initiates
2771 * the SCTP shutdown sequence.
2773 * Disables further send and receive operations
2774 * and initiates the SCTP shutdown sequence.
2776 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
2778 struct sctp_endpoint
*ep
;
2779 struct sctp_association
*asoc
;
2781 if (!sctp_style(sk
, TCP
))
2784 if (how
& SEND_SHUTDOWN
) {
2785 ep
= sctp_sk(sk
)->ep
;
2786 if (!list_empty(&ep
->asocs
)) {
2787 asoc
= list_entry(ep
->asocs
.next
,
2788 struct sctp_association
, asocs
);
2789 sctp_primitive_SHUTDOWN(asoc
, NULL
);
2794 /* 7.2.1 Association Status (SCTP_STATUS)
2796 * Applications can retrieve current status information about an
2797 * association, including association state, peer receiver window size,
2798 * number of unacked data chunks, and number of data chunks pending
2799 * receipt. This information is read-only.
2801 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
2802 char __user
*optval
,
2805 struct sctp_status status
;
2806 struct sctp_association
*asoc
= NULL
;
2807 struct sctp_transport
*transport
;
2808 sctp_assoc_t associd
;
2811 if (len
!= sizeof(status
)) {
2816 if (copy_from_user(&status
, optval
, sizeof(status
))) {
2821 associd
= status
.sstat_assoc_id
;
2822 asoc
= sctp_id2assoc(sk
, associd
);
2828 transport
= asoc
->peer
.primary_path
;
2830 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
2831 status
.sstat_state
= asoc
->state
;
2832 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
2833 status
.sstat_unackdata
= asoc
->unack_data
;
2835 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
2836 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
2837 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
2838 status
.sstat_fragmentation_point
= asoc
->frag_point
;
2839 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
2840 memcpy(&status
.sstat_primary
.spinfo_address
,
2841 &(transport
->ipaddr
), sizeof(union sctp_addr
));
2842 /* Map ipv4 address into v4-mapped-on-v6 address. */
2843 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
2844 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
2845 status
.sstat_primary
.spinfo_state
= transport
->state
;
2846 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
2847 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
2848 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
2849 status
.sstat_primary
.spinfo_mtu
= transport
->pmtu
;
2851 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
2852 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
2854 if (put_user(len
, optlen
)) {
2859 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
2860 len
, status
.sstat_state
, status
.sstat_rwnd
,
2861 status
.sstat_assoc_id
);
2863 if (copy_to_user(optval
, &status
, len
)) {
2873 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
2875 * Applications can retrieve information about a specific peer address
2876 * of an association, including its reachability state, congestion
2877 * window, and retransmission timer values. This information is
2880 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
2881 char __user
*optval
,
2884 struct sctp_paddrinfo pinfo
;
2885 struct sctp_transport
*transport
;
2888 if (len
!= sizeof(pinfo
)) {
2893 if (copy_from_user(&pinfo
, optval
, sizeof(pinfo
))) {
2898 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
2899 pinfo
.spinfo_assoc_id
);
2903 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
2904 pinfo
.spinfo_state
= transport
->state
;
2905 pinfo
.spinfo_cwnd
= transport
->cwnd
;
2906 pinfo
.spinfo_srtt
= transport
->srtt
;
2907 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
2908 pinfo
.spinfo_mtu
= transport
->pmtu
;
2910 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
2911 pinfo
.spinfo_state
= SCTP_ACTIVE
;
2913 if (put_user(len
, optlen
)) {
2918 if (copy_to_user(optval
, &pinfo
, len
)) {
2927 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2929 * This option is a on/off flag. If enabled no SCTP message
2930 * fragmentation will be performed. Instead if a message being sent
2931 * exceeds the current PMTU size, the message will NOT be sent and
2932 * instead a error will be indicated to the user.
2934 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
2935 char __user
*optval
, int __user
*optlen
)
2939 if (len
< sizeof(int))
2943 val
= (sctp_sk(sk
)->disable_fragments
== 1);
2944 if (put_user(len
, optlen
))
2946 if (copy_to_user(optval
, &val
, len
))
2951 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
2953 * This socket option is used to specify various notifications and
2954 * ancillary data the user wishes to receive.
2956 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
2959 if (len
!= sizeof(struct sctp_event_subscribe
))
2961 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
2966 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2968 * This socket option is applicable to the UDP-style socket only. When
2969 * set it will cause associations that are idle for more than the
2970 * specified number of seconds to automatically close. An association
2971 * being idle is defined an association that has NOT sent or received
2972 * user data. The special value of '0' indicates that no automatic
2973 * close of any associations should be performed. The option expects an
2974 * integer defining the number of seconds of idle time before an
2975 * association is closed.
2977 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
2979 /* Applicable to UDP-style socket only */
2980 if (sctp_style(sk
, TCP
))
2982 if (len
!= sizeof(int))
2984 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, len
))
2989 /* Helper routine to branch off an association to a new socket. */
2990 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
2991 struct socket
**sockp
)
2993 struct sock
*sk
= asoc
->base
.sk
;
2994 struct socket
*sock
;
2997 /* An association cannot be branched off from an already peeled-off
2998 * socket, nor is this supported for tcp style sockets.
3000 if (!sctp_style(sk
, UDP
))
3003 /* Create a new socket. */
3004 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
3008 /* Populate the fields of the newsk from the oldsk and migrate the
3009 * asoc to the newsk.
3011 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
3017 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3019 sctp_peeloff_arg_t peeloff
;
3020 struct socket
*newsock
;
3022 struct sctp_association
*asoc
;
3024 if (len
!= sizeof(sctp_peeloff_arg_t
))
3026 if (copy_from_user(&peeloff
, optval
, len
))
3029 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
3035 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __FUNCTION__
, sk
, asoc
);
3037 retval
= sctp_do_peeloff(asoc
, &newsock
);
3041 /* Map the socket to an unused fd that can be returned to the user. */
3042 retval
= sock_map_fd(newsock
);
3044 sock_release(newsock
);
3048 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3049 __FUNCTION__
, sk
, asoc
, newsock
->sk
, retval
);
3051 /* Return the fd mapped to the new socket. */
3052 peeloff
.sd
= retval
;
3053 if (copy_to_user(optval
, &peeloff
, len
))
3060 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3062 * Applications can enable or disable heartbeats for any peer address of
3063 * an association, modify an address's heartbeat interval, force a
3064 * heartbeat to be sent immediately, and adjust the address's maximum
3065 * number of retransmissions sent before an address is considered
3066 * unreachable. The following structure is used to access and modify an
3067 * address's parameters:
3069 * struct sctp_paddrparams {
3070 * sctp_assoc_t spp_assoc_id;
3071 * struct sockaddr_storage spp_address;
3072 * uint32_t spp_hbinterval;
3073 * uint16_t spp_pathmaxrxt;
3076 * spp_assoc_id - (UDP style socket) This is filled in the application,
3077 * and identifies the association for this query.
3078 * spp_address - This specifies which address is of interest.
3079 * spp_hbinterval - This contains the value of the heartbeat interval,
3080 * in milliseconds. A value of 0, when modifying the
3081 * parameter, specifies that the heartbeat on this
3082 * address should be disabled. A value of UINT32_MAX
3083 * (4294967295), when modifying the parameter,
3084 * specifies that a heartbeat should be sent
3085 * immediately to the peer address, and the current
3086 * interval should remain unchanged.
3087 * spp_pathmaxrxt - This contains the maximum number of
3088 * retransmissions before this address shall be
3089 * considered unreachable.
3091 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
3092 char __user
*optval
, int __user
*optlen
)
3094 struct sctp_paddrparams params
;
3095 struct sctp_transport
*trans
;
3097 if (len
!= sizeof(struct sctp_paddrparams
))
3099 if (copy_from_user(¶ms
, optval
, len
))
3102 /* If no association id is specified retrieve the default value
3103 * for the endpoint that will be used for all future associations
3105 if (!params
.spp_assoc_id
&&
3106 sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
3107 params
.spp_hbinterval
= sctp_sk(sk
)->paddrparam
.spp_hbinterval
;
3108 params
.spp_pathmaxrxt
= sctp_sk(sk
)->paddrparam
.spp_pathmaxrxt
;
3113 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
3114 params
.spp_assoc_id
);
3118 /* The value of the heartbeat interval, in milliseconds. A value of 0,
3119 * when modifying the parameter, specifies that the heartbeat on this
3120 * address should be disabled.
3122 if (!trans
->hb_allowed
)
3123 params
.spp_hbinterval
= 0;
3125 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hb_interval
);
3127 /* spp_pathmaxrxt contains the maximum number of retransmissions
3128 * before this address shall be considered unreachable.
3130 params
.spp_pathmaxrxt
= trans
->max_retrans
;
3133 if (copy_to_user(optval
, ¶ms
, len
))
3136 if (put_user(len
, optlen
))
3142 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
3144 * Applications can specify protocol parameters for the default association
3145 * initialization. The option name argument to setsockopt() and getsockopt()
3148 * Setting initialization parameters is effective only on an unconnected
3149 * socket (for UDP-style sockets only future associations are effected
3150 * by the change). With TCP-style sockets, this option is inherited by
3151 * sockets derived from a listener socket.
3153 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3155 if (len
!= sizeof(struct sctp_initmsg
))
3157 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
3162 static int sctp_getsockopt_peer_addrs_num_old(struct sock
*sk
, int len
,
3163 char __user
*optval
,
3167 struct sctp_association
*asoc
;
3168 struct list_head
*pos
;
3171 if (len
!= sizeof(sctp_assoc_t
))
3174 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
3177 /* For UDP-style sockets, id specifies the association to query. */
3178 asoc
= sctp_id2assoc(sk
, id
);
3182 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3190 * Old API for getting list of peer addresses. Does not work for 32-bit
3191 * programs running on a 64-bit kernel
3193 static int sctp_getsockopt_peer_addrs_old(struct sock
*sk
, int len
,
3194 char __user
*optval
,
3197 struct sctp_association
*asoc
;
3198 struct list_head
*pos
;
3200 struct sctp_getaddrs_old getaddrs
;
3201 struct sctp_transport
*from
;
3203 union sctp_addr temp
;
3204 struct sctp_sock
*sp
= sctp_sk(sk
);
3207 if (len
!= sizeof(struct sctp_getaddrs_old
))
3210 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs_old
)))
3213 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
3215 /* For UDP-style sockets, id specifies the association to query. */
3216 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3220 to
= (void __user
*)getaddrs
.addrs
;
3221 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3222 from
= list_entry(pos
, struct sctp_transport
, transports
);
3223 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
3224 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3225 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3226 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3227 if (copy_to_user(to
, &temp
, addrlen
))
3231 if (cnt
>= getaddrs
.addr_num
) break;
3233 getaddrs
.addr_num
= cnt
;
3234 if (copy_to_user(optval
, &getaddrs
, sizeof(struct sctp_getaddrs_old
)))
3240 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
3241 char __user
*optval
, int __user
*optlen
)
3243 struct sctp_association
*asoc
;
3244 struct list_head
*pos
;
3246 struct sctp_getaddrs getaddrs
;
3247 struct sctp_transport
*from
;
3249 union sctp_addr temp
;
3250 struct sctp_sock
*sp
= sctp_sk(sk
);
3255 if (len
< sizeof(struct sctp_getaddrs
))
3258 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
3261 /* For UDP-style sockets, id specifies the association to query. */
3262 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3266 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
3267 space_left
= len
- sizeof(struct sctp_getaddrs
) -
3268 offsetof(struct sctp_getaddrs
,addrs
);
3270 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3271 from
= list_entry(pos
, struct sctp_transport
, transports
);
3272 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
3273 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3274 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3275 if(space_left
< addrlen
)
3277 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3278 if (copy_to_user(to
, &temp
, addrlen
))
3282 space_left
-= addrlen
;
3285 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
3287 bytes_copied
= ((char __user
*)to
) - optval
;
3288 if (put_user(bytes_copied
, optlen
))
3294 static int sctp_getsockopt_local_addrs_num_old(struct sock
*sk
, int len
,
3295 char __user
*optval
,
3299 struct sctp_bind_addr
*bp
;
3300 struct sctp_association
*asoc
;
3301 struct list_head
*pos
;
3302 struct sctp_sockaddr_entry
*addr
;
3303 rwlock_t
*addr_lock
;
3304 unsigned long flags
;
3307 if (len
!= sizeof(sctp_assoc_t
))
3310 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
3314 * For UDP-style sockets, id specifies the association to query.
3315 * If the id field is set to the value '0' then the locally bound
3316 * addresses are returned without regard to any particular
3320 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
3321 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
3323 asoc
= sctp_id2assoc(sk
, id
);
3326 bp
= &asoc
->base
.bind_addr
;
3327 addr_lock
= &asoc
->base
.addr_lock
;
3330 sctp_read_lock(addr_lock
);
3332 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
3333 * addresses from the global local address list.
3335 if (sctp_list_single_entry(&bp
->address_list
)) {
3336 addr
= list_entry(bp
->address_list
.next
,
3337 struct sctp_sockaddr_entry
, list
);
3338 if (sctp_is_any(&addr
->a
)) {
3339 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3340 list_for_each(pos
, &sctp_local_addr_list
) {
3341 addr
= list_entry(pos
,
3342 struct sctp_sockaddr_entry
,
3344 if ((PF_INET
== sk
->sk_family
) &&
3345 (AF_INET6
== addr
->a
.sa
.sa_family
))
3349 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3357 list_for_each(pos
, &bp
->address_list
) {
3362 sctp_read_unlock(addr_lock
);
3366 /* Helper function that copies local addresses to user and returns the number
3367 * of addresses copied.
3369 static int sctp_copy_laddrs_to_user_old(struct sock
*sk
, __u16 port
, int max_addrs
,
3372 struct list_head
*pos
;
3373 struct sctp_sockaddr_entry
*addr
;
3374 unsigned long flags
;
3375 union sctp_addr temp
;
3379 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3380 list_for_each(pos
, &sctp_local_addr_list
) {
3381 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3382 if ((PF_INET
== sk
->sk_family
) &&
3383 (AF_INET6
== addr
->a
.sa
.sa_family
))
3385 memcpy(&temp
, &addr
->a
, sizeof(temp
));
3386 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3388 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3389 temp
.v4
.sin_port
= htons(port
);
3390 if (copy_to_user(to
, &temp
, addrlen
)) {
3391 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3397 if (cnt
>= max_addrs
) break;
3399 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
3404 static int sctp_copy_laddrs_to_user(struct sock
*sk
, __u16 port
,
3405 void * __user
*to
, size_t space_left
)
3407 struct list_head
*pos
;
3408 struct sctp_sockaddr_entry
*addr
;
3409 unsigned long flags
;
3410 union sctp_addr temp
;
3414 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3415 list_for_each(pos
, &sctp_local_addr_list
) {
3416 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3417 if ((PF_INET
== sk
->sk_family
) &&
3418 (AF_INET6
== addr
->a
.sa
.sa_family
))
3420 memcpy(&temp
, &addr
->a
, sizeof(temp
));
3421 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3423 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3424 if(space_left
<addrlen
)
3426 temp
.v4
.sin_port
= htons(port
);
3427 if (copy_to_user(*to
, &temp
, addrlen
)) {
3428 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3434 space_left
-= addrlen
;
3436 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
3441 /* Old API for getting list of local addresses. Does not work for 32-bit
3442 * programs running on a 64-bit kernel
3444 static int sctp_getsockopt_local_addrs_old(struct sock
*sk
, int len
,
3445 char __user
*optval
, int __user
*optlen
)
3447 struct sctp_bind_addr
*bp
;
3448 struct sctp_association
*asoc
;
3449 struct list_head
*pos
;
3451 struct sctp_getaddrs_old getaddrs
;
3452 struct sctp_sockaddr_entry
*addr
;
3454 union sctp_addr temp
;
3455 struct sctp_sock
*sp
= sctp_sk(sk
);
3457 rwlock_t
*addr_lock
;
3460 if (len
!= sizeof(struct sctp_getaddrs_old
))
3463 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs_old
)))
3466 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
3468 * For UDP-style sockets, id specifies the association to query.
3469 * If the id field is set to the value '0' then the locally bound
3470 * addresses are returned without regard to any particular
3473 if (0 == getaddrs
.assoc_id
) {
3474 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
3475 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
3477 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3480 bp
= &asoc
->base
.bind_addr
;
3481 addr_lock
= &asoc
->base
.addr_lock
;
3484 to
= getaddrs
.addrs
;
3486 sctp_read_lock(addr_lock
);
3488 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
3489 * addresses from the global local address list.
3491 if (sctp_list_single_entry(&bp
->address_list
)) {
3492 addr
= list_entry(bp
->address_list
.next
,
3493 struct sctp_sockaddr_entry
, list
);
3494 if (sctp_is_any(&addr
->a
)) {
3495 cnt
= sctp_copy_laddrs_to_user_old(sk
, bp
->port
,
3506 list_for_each(pos
, &bp
->address_list
) {
3507 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3508 memcpy(&temp
, &addr
->a
, sizeof(temp
));
3509 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3510 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3511 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3512 if (copy_to_user(to
, &temp
, addrlen
)) {
3518 if (cnt
>= getaddrs
.addr_num
) break;
3522 getaddrs
.addr_num
= cnt
;
3523 if (copy_to_user(optval
, &getaddrs
, sizeof(struct sctp_getaddrs_old
)))
3527 sctp_read_unlock(addr_lock
);
3531 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
3532 char __user
*optval
, int __user
*optlen
)
3534 struct sctp_bind_addr
*bp
;
3535 struct sctp_association
*asoc
;
3536 struct list_head
*pos
;
3538 struct sctp_getaddrs getaddrs
;
3539 struct sctp_sockaddr_entry
*addr
;
3541 union sctp_addr temp
;
3542 struct sctp_sock
*sp
= sctp_sk(sk
);
3544 rwlock_t
*addr_lock
;
3549 if (len
<= sizeof(struct sctp_getaddrs
))
3552 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
3556 * For UDP-style sockets, id specifies the association to query.
3557 * If the id field is set to the value '0' then the locally bound
3558 * addresses are returned without regard to any particular
3561 if (0 == getaddrs
.assoc_id
) {
3562 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
3563 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
3565 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3568 bp
= &asoc
->base
.bind_addr
;
3569 addr_lock
= &asoc
->base
.addr_lock
;
3572 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
3573 space_left
= len
- sizeof(struct sctp_getaddrs
) -
3574 offsetof(struct sctp_getaddrs
,addrs
);
3576 sctp_read_lock(addr_lock
);
3578 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
3579 * addresses from the global local address list.
3581 if (sctp_list_single_entry(&bp
->address_list
)) {
3582 addr
= list_entry(bp
->address_list
.next
,
3583 struct sctp_sockaddr_entry
, list
);
3584 if (sctp_is_any(&addr
->a
)) {
3585 cnt
= sctp_copy_laddrs_to_user(sk
, bp
->port
,
3595 list_for_each(pos
, &bp
->address_list
) {
3596 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3597 memcpy(&temp
, &addr
->a
, sizeof(temp
));
3598 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3599 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3600 if(space_left
< addrlen
)
3601 return -ENOMEM
; /*fixme: right error?*/
3602 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3603 if (copy_to_user(to
, &temp
, addrlen
)) {
3609 space_left
-= addrlen
;
3613 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
3615 bytes_copied
= ((char __user
*)to
) - optval
;
3616 if (put_user(bytes_copied
, optlen
))
3620 sctp_read_unlock(addr_lock
);
3624 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3626 * Requests that the local SCTP stack use the enclosed peer address as
3627 * the association primary. The enclosed address must be one of the
3628 * association peer's addresses.
3630 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
3631 char __user
*optval
, int __user
*optlen
)
3633 struct sctp_prim prim
;
3634 struct sctp_association
*asoc
;
3635 struct sctp_sock
*sp
= sctp_sk(sk
);
3637 if (len
!= sizeof(struct sctp_prim
))
3640 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
3643 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
3647 if (!asoc
->peer
.primary_path
)
3650 asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
=
3651 htons(asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
);
3652 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
3653 sizeof(union sctp_addr
));
3654 asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
=
3655 ntohs(asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
);
3657 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
3658 (union sctp_addr
*)&prim
.ssp_addr
);
3660 if (copy_to_user(optval
, &prim
, sizeof(struct sctp_prim
)))
3667 * 7.1.11 Set Adaption Layer Indicator (SCTP_ADAPTION_LAYER)
3669 * Requests that the local endpoint set the specified Adaption Layer
3670 * Indication parameter for all future INIT and INIT-ACK exchanges.
3672 static int sctp_getsockopt_adaption_layer(struct sock
*sk
, int len
,
3673 char __user
*optval
, int __user
*optlen
)
3677 if (len
< sizeof(__u32
))
3680 len
= sizeof(__u32
);
3681 val
= sctp_sk(sk
)->adaption_ind
;
3682 if (put_user(len
, optlen
))
3684 if (copy_to_user(optval
, &val
, len
))
3691 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
3693 * Applications that wish to use the sendto() system call may wish to
3694 * specify a default set of parameters that would normally be supplied
3695 * through the inclusion of ancillary data. This socket option allows
3696 * such an application to set the default sctp_sndrcvinfo structure.
3699 * The application that wishes to use this socket option simply passes
3700 * in to this call the sctp_sndrcvinfo structure defined in Section
3701 * 5.2.2) The input parameters accepted by this call include
3702 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
3703 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
3704 * to this call if the caller is using the UDP model.
3706 * For getsockopt, it get the default sctp_sndrcvinfo structure.
3708 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
3709 int len
, char __user
*optval
,
3712 struct sctp_sndrcvinfo info
;
3713 struct sctp_association
*asoc
;
3714 struct sctp_sock
*sp
= sctp_sk(sk
);
3716 if (len
!= sizeof(struct sctp_sndrcvinfo
))
3718 if (copy_from_user(&info
, optval
, sizeof(struct sctp_sndrcvinfo
)))
3721 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
3722 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
3726 info
.sinfo_stream
= asoc
->default_stream
;
3727 info
.sinfo_flags
= asoc
->default_flags
;
3728 info
.sinfo_ppid
= asoc
->default_ppid
;
3729 info
.sinfo_context
= asoc
->default_context
;
3730 info
.sinfo_timetolive
= asoc
->default_timetolive
;
3732 info
.sinfo_stream
= sp
->default_stream
;
3733 info
.sinfo_flags
= sp
->default_flags
;
3734 info
.sinfo_ppid
= sp
->default_ppid
;
3735 info
.sinfo_context
= sp
->default_context
;
3736 info
.sinfo_timetolive
= sp
->default_timetolive
;
3739 if (copy_to_user(optval
, &info
, sizeof(struct sctp_sndrcvinfo
)))
3747 * 7.1.5 SCTP_NODELAY
3749 * Turn on/off any Nagle-like algorithm. This means that packets are
3750 * generally sent as soon as possible and no unnecessary delays are
3751 * introduced, at the cost of more packets in the network. Expects an
3752 * integer boolean flag.
3755 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
3756 char __user
*optval
, int __user
*optlen
)
3760 if (len
< sizeof(int))
3764 val
= (sctp_sk(sk
)->nodelay
== 1);
3765 if (put_user(len
, optlen
))
3767 if (copy_to_user(optval
, &val
, len
))
3774 * 7.1.1 SCTP_RTOINFO
3776 * The protocol parameters used to initialize and bound retransmission
3777 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3778 * and modify these parameters.
3779 * All parameters are time values, in milliseconds. A value of 0, when
3780 * modifying the parameters, indicates that the current value should not
3784 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
3785 char __user
*optval
,
3786 int __user
*optlen
) {
3787 struct sctp_rtoinfo rtoinfo
;
3788 struct sctp_association
*asoc
;
3790 if (len
!= sizeof (struct sctp_rtoinfo
))
3793 if (copy_from_user(&rtoinfo
, optval
, sizeof (struct sctp_rtoinfo
)))
3796 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
3798 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
3801 /* Values corresponding to the specific association. */
3803 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
3804 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
3805 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
3807 /* Values corresponding to the endpoint. */
3808 struct sctp_sock
*sp
= sctp_sk(sk
);
3810 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
3811 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
3812 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
3815 if (put_user(len
, optlen
))
3818 if (copy_to_user(optval
, &rtoinfo
, len
))
3826 * 7.1.2 SCTP_ASSOCINFO
3828 * This option is used to tune the the maximum retransmission attempts
3829 * of the association.
3830 * Returns an error if the new association retransmission value is
3831 * greater than the sum of the retransmission value of the peer.
3832 * See [SCTP] for more information.
3835 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
3836 char __user
*optval
,
3840 struct sctp_assocparams assocparams
;
3841 struct sctp_association
*asoc
;
3842 struct list_head
*pos
;
3845 if (len
!= sizeof (struct sctp_assocparams
))
3848 if (copy_from_user(&assocparams
, optval
,
3849 sizeof (struct sctp_assocparams
)))
3852 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
3854 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
3857 /* Values correspoinding to the specific association */
3859 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
3860 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
3861 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
3862 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
3864 (asoc
->cookie_life
.tv_usec
3867 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3871 assocparams
.sasoc_number_peer_destinations
= cnt
;
3873 /* Values corresponding to the endpoint */
3874 struct sctp_sock
*sp
= sctp_sk(sk
);
3876 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
3877 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
3878 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
3879 assocparams
.sasoc_cookie_life
=
3880 sp
->assocparams
.sasoc_cookie_life
;
3881 assocparams
.sasoc_number_peer_destinations
=
3883 sasoc_number_peer_destinations
;
3886 if (put_user(len
, optlen
))
3889 if (copy_to_user(optval
, &assocparams
, len
))
3896 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3898 * This socket option is a boolean flag which turns on or off mapped V4
3899 * addresses. If this option is turned on and the socket is type
3900 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3901 * If this option is turned off, then no mapping will be done of V4
3902 * addresses and a user will receive both PF_INET6 and PF_INET type
3903 * addresses on the socket.
3905 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
3906 char __user
*optval
, int __user
*optlen
)
3909 struct sctp_sock
*sp
= sctp_sk(sk
);
3911 if (len
< sizeof(int))
3916 if (put_user(len
, optlen
))
3918 if (copy_to_user(optval
, &val
, len
))
3925 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
3927 * This socket option specifies the maximum size to put in any outgoing
3928 * SCTP chunk. If a message is larger than this size it will be
3929 * fragmented by SCTP into the specified size. Note that the underlying
3930 * SCTP implementation may fragment into smaller sized chunks when the
3931 * PMTU of the underlying association is smaller than the value set by
3934 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
3935 char __user
*optval
, int __user
*optlen
)
3939 if (len
< sizeof(int))
3944 val
= sctp_sk(sk
)->user_frag
;
3945 if (put_user(len
, optlen
))
3947 if (copy_to_user(optval
, &val
, len
))
3953 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
3954 char __user
*optval
, int __user
*optlen
)
3959 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
3962 /* I can hardly begin to describe how wrong this is. This is
3963 * so broken as to be worse than useless. The API draft
3964 * REALLY is NOT helpful here... I am not convinced that the
3965 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
3966 * are at all well-founded.
3968 if (level
!= SOL_SCTP
) {
3969 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3971 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
3975 if (get_user(len
, optlen
))
3982 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
3984 case SCTP_DISABLE_FRAGMENTS
:
3985 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
3989 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
3991 case SCTP_AUTOCLOSE
:
3992 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
3994 case SCTP_SOCKOPT_PEELOFF
:
3995 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
3997 case SCTP_PEER_ADDR_PARAMS
:
3998 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
4002 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
4004 case SCTP_GET_PEER_ADDRS_NUM_OLD
:
4005 retval
= sctp_getsockopt_peer_addrs_num_old(sk
, len
, optval
,
4008 case SCTP_GET_LOCAL_ADDRS_NUM_OLD
:
4009 retval
= sctp_getsockopt_local_addrs_num_old(sk
, len
, optval
,
4012 case SCTP_GET_PEER_ADDRS_OLD
:
4013 retval
= sctp_getsockopt_peer_addrs_old(sk
, len
, optval
,
4016 case SCTP_GET_LOCAL_ADDRS_OLD
:
4017 retval
= sctp_getsockopt_local_addrs_old(sk
, len
, optval
,
4020 case SCTP_GET_PEER_ADDRS
:
4021 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
4024 case SCTP_GET_LOCAL_ADDRS
:
4025 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
4028 case SCTP_DEFAULT_SEND_PARAM
:
4029 retval
= sctp_getsockopt_default_send_param(sk
, len
,
4032 case SCTP_PRIMARY_ADDR
:
4033 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
4036 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
4039 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
4041 case SCTP_ASSOCINFO
:
4042 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
4044 case SCTP_I_WANT_MAPPED_V4_ADDR
:
4045 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
4048 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
4050 case SCTP_GET_PEER_ADDR_INFO
:
4051 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
4054 case SCTP_ADAPTION_LAYER
:
4055 retval
= sctp_getsockopt_adaption_layer(sk
, len
, optval
,
4059 retval
= -ENOPROTOOPT
;
4063 sctp_release_sock(sk
);
4067 static void sctp_hash(struct sock
*sk
)
4072 static void sctp_unhash(struct sock
*sk
)
4077 /* Check if port is acceptable. Possibly find first available port.
4079 * The port hash table (contained in the 'global' SCTP protocol storage
4080 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
4081 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
4082 * list (the list number is the port number hashed out, so as you
4083 * would expect from a hash function, all the ports in a given list have
4084 * such a number that hashes out to the same list number; you were
4085 * expecting that, right?); so each list has a set of ports, with a
4086 * link to the socket (struct sock) that uses it, the port number and
4087 * a fastreuse flag (FIXME: NPI ipg).
4089 static struct sctp_bind_bucket
*sctp_bucket_create(
4090 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
4092 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
4094 struct sctp_bind_hashbucket
*head
; /* hash list */
4095 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
4096 unsigned short snum
;
4099 /* NOTE: Remember to put this back to net order. */
4100 addr
->v4
.sin_port
= ntohs(addr
->v4
.sin_port
);
4101 snum
= addr
->v4
.sin_port
;
4103 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
4104 sctp_local_bh_disable();
4107 /* Search for an available port.
4109 * 'sctp_port_rover' was the last port assigned, so
4110 * we start to search from 'sctp_port_rover +
4111 * 1'. What we do is first check if port 'rover' is
4112 * already in the hash table; if not, we use that; if
4113 * it is, we try next.
4115 int low
= sysctl_local_port_range
[0];
4116 int high
= sysctl_local_port_range
[1];
4117 int remaining
= (high
- low
) + 1;
4121 sctp_spin_lock(&sctp_port_alloc_lock
);
4122 rover
= sctp_port_rover
;
4125 if ((rover
< low
) || (rover
> high
))
4127 index
= sctp_phashfn(rover
);
4128 head
= &sctp_port_hashtable
[index
];
4129 sctp_spin_lock(&head
->lock
);
4130 for (pp
= head
->chain
; pp
; pp
= pp
->next
)
4131 if (pp
->port
== rover
)
4135 sctp_spin_unlock(&head
->lock
);
4136 } while (--remaining
> 0);
4137 sctp_port_rover
= rover
;
4138 sctp_spin_unlock(&sctp_port_alloc_lock
);
4140 /* Exhausted local port range during search? */
4145 /* OK, here is the one we will use. HEAD (the port
4146 * hash table list entry) is non-NULL and we hold it's
4151 /* We are given an specific port number; we verify
4152 * that it is not being used. If it is used, we will
4153 * exahust the search in the hash list corresponding
4154 * to the port number (snum) - we detect that with the
4155 * port iterator, pp being NULL.
4157 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
4158 sctp_spin_lock(&head
->lock
);
4159 for (pp
= head
->chain
; pp
; pp
= pp
->next
) {
4160 if (pp
->port
== snum
)
4167 if (!hlist_empty(&pp
->owner
)) {
4168 /* We had a port hash table hit - there is an
4169 * available port (pp != NULL) and it is being
4170 * used by other socket (pp->owner not empty); that other
4171 * socket is going to be sk2.
4173 int reuse
= sk
->sk_reuse
;
4175 struct hlist_node
*node
;
4177 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
4178 if (pp
->fastreuse
&& sk
->sk_reuse
)
4181 /* Run through the list of sockets bound to the port
4182 * (pp->port) [via the pointers bind_next and
4183 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
4184 * we get the endpoint they describe and run through
4185 * the endpoint's list of IP (v4 or v6) addresses,
4186 * comparing each of the addresses with the address of
4187 * the socket sk. If we find a match, then that means
4188 * that this port/socket (sk) combination are already
4191 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
4192 struct sctp_endpoint
*ep2
;
4193 ep2
= sctp_sk(sk2
)->ep
;
4195 if (reuse
&& sk2
->sk_reuse
)
4198 if (sctp_bind_addr_match(&ep2
->base
.bind_addr
, addr
,
4204 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
4207 /* If there was a hash table miss, create a new port. */
4209 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
4212 /* In either case (hit or miss), make sure fastreuse is 1 only
4213 * if sk->sk_reuse is too (that is, if the caller requested
4214 * SO_REUSEADDR on this socket -sk-).
4216 if (hlist_empty(&pp
->owner
))
4217 pp
->fastreuse
= sk
->sk_reuse
? 1 : 0;
4218 else if (pp
->fastreuse
&& !sk
->sk_reuse
)
4221 /* We are set, so fill up all the data in the hash table
4222 * entry, tie the socket list information with the rest of the
4223 * sockets FIXME: Blurry, NPI (ipg).
4226 inet_sk(sk
)->num
= snum
;
4227 if (!sctp_sk(sk
)->bind_hash
) {
4228 sk_add_bind_node(sk
, &pp
->owner
);
4229 sctp_sk(sk
)->bind_hash
= pp
;
4234 sctp_spin_unlock(&head
->lock
);
4237 sctp_local_bh_enable();
4238 addr
->v4
.sin_port
= htons(addr
->v4
.sin_port
);
4242 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
4243 * port is requested.
4245 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
4248 union sctp_addr addr
;
4249 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
4251 /* Set up a dummy address struct from the sk. */
4252 af
->from_sk(&addr
, sk
);
4253 addr
.v4
.sin_port
= htons(snum
);
4255 /* Note: sk->sk_num gets filled in if ephemeral port request. */
4256 ret
= sctp_get_port_local(sk
, &addr
);
4258 return (ret
? 1 : 0);
4262 * 3.1.3 listen() - UDP Style Syntax
4264 * By default, new associations are not accepted for UDP style sockets.
4265 * An application uses listen() to mark a socket as being able to
4266 * accept new associations.
4268 SCTP_STATIC
int sctp_seqpacket_listen(struct sock
*sk
, int backlog
)
4270 struct sctp_sock
*sp
= sctp_sk(sk
);
4271 struct sctp_endpoint
*ep
= sp
->ep
;
4273 /* Only UDP style sockets that are not peeled off are allowed to
4276 if (!sctp_style(sk
, UDP
))
4279 /* If backlog is zero, disable listening. */
4281 if (sctp_sstate(sk
, CLOSED
))
4284 sctp_unhash_endpoint(ep
);
4285 sk
->sk_state
= SCTP_SS_CLOSED
;
4288 /* Return if we are already listening. */
4289 if (sctp_sstate(sk
, LISTENING
))
4293 * If a bind() or sctp_bindx() is not called prior to a listen()
4294 * call that allows new associations to be accepted, the system
4295 * picks an ephemeral port and will choose an address set equivalent
4296 * to binding with a wildcard address.
4298 * This is not currently spelled out in the SCTP sockets
4299 * extensions draft, but follows the practice as seen in TCP
4302 if (!ep
->base
.bind_addr
.port
) {
4303 if (sctp_autobind(sk
))
4306 sk
->sk_state
= SCTP_SS_LISTENING
;
4307 sctp_hash_endpoint(ep
);
4312 * 4.1.3 listen() - TCP Style Syntax
4314 * Applications uses listen() to ready the SCTP endpoint for accepting
4315 * inbound associations.
4317 SCTP_STATIC
int sctp_stream_listen(struct sock
*sk
, int backlog
)
4319 struct sctp_sock
*sp
= sctp_sk(sk
);
4320 struct sctp_endpoint
*ep
= sp
->ep
;
4322 /* If backlog is zero, disable listening. */
4324 if (sctp_sstate(sk
, CLOSED
))
4327 sctp_unhash_endpoint(ep
);
4328 sk
->sk_state
= SCTP_SS_CLOSED
;
4331 if (sctp_sstate(sk
, LISTENING
))
4335 * If a bind() or sctp_bindx() is not called prior to a listen()
4336 * call that allows new associations to be accepted, the system
4337 * picks an ephemeral port and will choose an address set equivalent
4338 * to binding with a wildcard address.
4340 * This is not currently spelled out in the SCTP sockets
4341 * extensions draft, but follows the practice as seen in TCP
4344 if (!ep
->base
.bind_addr
.port
) {
4345 if (sctp_autobind(sk
))
4348 sk
->sk_state
= SCTP_SS_LISTENING
;
4349 sk
->sk_max_ack_backlog
= backlog
;
4350 sctp_hash_endpoint(ep
);
4355 * Move a socket to LISTENING state.
4357 int sctp_inet_listen(struct socket
*sock
, int backlog
)
4359 struct sock
*sk
= sock
->sk
;
4360 struct crypto_tfm
*tfm
=NULL
;
4363 if (unlikely(backlog
< 0))
4368 if (sock
->state
!= SS_UNCONNECTED
)
4371 /* Allocate HMAC for generating cookie. */
4372 if (sctp_hmac_alg
) {
4373 tfm
= sctp_crypto_alloc_tfm(sctp_hmac_alg
, 0);
4380 switch (sock
->type
) {
4381 case SOCK_SEQPACKET
:
4382 err
= sctp_seqpacket_listen(sk
, backlog
);
4385 err
= sctp_stream_listen(sk
, backlog
);
4393 /* Store away the transform reference. */
4394 sctp_sk(sk
)->hmac
= tfm
;
4396 sctp_release_sock(sk
);
4399 sctp_crypto_free_tfm(tfm
);
4404 * This function is done by modeling the current datagram_poll() and the
4405 * tcp_poll(). Note that, based on these implementations, we don't
4406 * lock the socket in this function, even though it seems that,
4407 * ideally, locking or some other mechanisms can be used to ensure
4408 * the integrity of the counters (sndbuf and wmem_queued) used
4409 * in this place. We assume that we don't need locks either until proven
4412 * Another thing to note is that we include the Async I/O support
4413 * here, again, by modeling the current TCP/UDP code. We don't have
4414 * a good way to test with it yet.
4416 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
4418 struct sock
*sk
= sock
->sk
;
4419 struct sctp_sock
*sp
= sctp_sk(sk
);
4422 poll_wait(file
, sk
->sk_sleep
, wait
);
4424 /* A TCP-style listening socket becomes readable when the accept queue
4427 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
4428 return (!list_empty(&sp
->ep
->asocs
)) ?
4429 (POLLIN
| POLLRDNORM
) : 0;
4433 /* Is there any exceptional events? */
4434 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
4436 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
4439 /* Is it readable? Reconsider this code with TCP-style support. */
4440 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
4441 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
4442 mask
|= POLLIN
| POLLRDNORM
;
4444 /* The association is either gone or not ready. */
4445 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
4448 /* Is it writable? */
4449 if (sctp_writeable(sk
)) {
4450 mask
|= POLLOUT
| POLLWRNORM
;
4452 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
4454 * Since the socket is not locked, the buffer
4455 * might be made available after the writeable check and
4456 * before the bit is set. This could cause a lost I/O
4457 * signal. tcp_poll() has a race breaker for this race
4458 * condition. Based on their implementation, we put
4459 * in the following code to cover it as well.
4461 if (sctp_writeable(sk
))
4462 mask
|= POLLOUT
| POLLWRNORM
;
4467 /********************************************************************
4468 * 2nd Level Abstractions
4469 ********************************************************************/
4471 static struct sctp_bind_bucket
*sctp_bucket_create(
4472 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
4474 struct sctp_bind_bucket
*pp
;
4476 pp
= kmem_cache_alloc(sctp_bucket_cachep
, SLAB_ATOMIC
);
4477 SCTP_DBG_OBJCNT_INC(bind_bucket
);
4481 INIT_HLIST_HEAD(&pp
->owner
);
4482 if ((pp
->next
= head
->chain
) != NULL
)
4483 pp
->next
->pprev
= &pp
->next
;
4485 pp
->pprev
= &head
->chain
;
4490 /* Caller must hold hashbucket lock for this tb with local BH disabled */
4491 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
4493 if (hlist_empty(&pp
->owner
)) {
4495 pp
->next
->pprev
= pp
->pprev
;
4496 *(pp
->pprev
) = pp
->next
;
4497 kmem_cache_free(sctp_bucket_cachep
, pp
);
4498 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
4502 /* Release this socket's reference to a local port. */
4503 static inline void __sctp_put_port(struct sock
*sk
)
4505 struct sctp_bind_hashbucket
*head
=
4506 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->num
)];
4507 struct sctp_bind_bucket
*pp
;
4509 sctp_spin_lock(&head
->lock
);
4510 pp
= sctp_sk(sk
)->bind_hash
;
4511 __sk_del_bind_node(sk
);
4512 sctp_sk(sk
)->bind_hash
= NULL
;
4513 inet_sk(sk
)->num
= 0;
4514 sctp_bucket_destroy(pp
);
4515 sctp_spin_unlock(&head
->lock
);
4518 void sctp_put_port(struct sock
*sk
)
4520 sctp_local_bh_disable();
4521 __sctp_put_port(sk
);
4522 sctp_local_bh_enable();
4526 * The system picks an ephemeral port and choose an address set equivalent
4527 * to binding with a wildcard address.
4528 * One of those addresses will be the primary address for the association.
4529 * This automatically enables the multihoming capability of SCTP.
4531 static int sctp_autobind(struct sock
*sk
)
4533 union sctp_addr autoaddr
;
4535 unsigned short port
;
4537 /* Initialize a local sockaddr structure to INADDR_ANY. */
4538 af
= sctp_sk(sk
)->pf
->af
;
4540 port
= htons(inet_sk(sk
)->num
);
4541 af
->inaddr_any(&autoaddr
, port
);
4543 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
4546 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
4549 * 4.2 The cmsghdr Structure *
4551 * When ancillary data is sent or received, any number of ancillary data
4552 * objects can be specified by the msg_control and msg_controllen members of
4553 * the msghdr structure, because each object is preceded by
4554 * a cmsghdr structure defining the object's length (the cmsg_len member).
4555 * Historically Berkeley-derived implementations have passed only one object
4556 * at a time, but this API allows multiple objects to be
4557 * passed in a single call to sendmsg() or recvmsg(). The following example
4558 * shows two ancillary data objects in a control buffer.
4560 * |<--------------------------- msg_controllen -------------------------->|
4563 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
4565 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
4568 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
4570 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
4573 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
4574 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
4576 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
4578 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
4585 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
4586 sctp_cmsgs_t
*cmsgs
)
4588 struct cmsghdr
*cmsg
;
4590 for (cmsg
= CMSG_FIRSTHDR(msg
);
4592 cmsg
= CMSG_NXTHDR((struct msghdr
*)msg
, cmsg
)) {
4593 if (!CMSG_OK(msg
, cmsg
))
4596 /* Should we parse this header or ignore? */
4597 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
4600 /* Strictly check lengths following example in SCM code. */
4601 switch (cmsg
->cmsg_type
) {
4603 /* SCTP Socket API Extension
4604 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
4606 * This cmsghdr structure provides information for
4607 * initializing new SCTP associations with sendmsg().
4608 * The SCTP_INITMSG socket option uses this same data
4609 * structure. This structure is not used for
4612 * cmsg_level cmsg_type cmsg_data[]
4613 * ------------ ------------ ----------------------
4614 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
4616 if (cmsg
->cmsg_len
!=
4617 CMSG_LEN(sizeof(struct sctp_initmsg
)))
4619 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
4623 /* SCTP Socket API Extension
4624 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
4626 * This cmsghdr structure specifies SCTP options for
4627 * sendmsg() and describes SCTP header information
4628 * about a received message through recvmsg().
4630 * cmsg_level cmsg_type cmsg_data[]
4631 * ------------ ------------ ----------------------
4632 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
4634 if (cmsg
->cmsg_len
!=
4635 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
4639 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
4641 /* Minimally, validate the sinfo_flags. */
4642 if (cmsgs
->info
->sinfo_flags
&
4643 ~(MSG_UNORDERED
| MSG_ADDR_OVER
|
4644 MSG_ABORT
| MSG_EOF
))
4656 * Wait for a packet..
4657 * Note: This function is the same function as in core/datagram.c
4658 * with a few modifications to make lksctp work.
4660 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
4665 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
4667 /* Socket errors? */
4668 error
= sock_error(sk
);
4672 if (!skb_queue_empty(&sk
->sk_receive_queue
))
4675 /* Socket shut down? */
4676 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
4679 /* Sequenced packets can come disconnected. If so we report the
4684 /* Is there a good reason to think that we may receive some data? */
4685 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
4688 /* Handle signals. */
4689 if (signal_pending(current
))
4692 /* Let another process have a go. Since we are going to sleep
4693 * anyway. Note: This may cause odd behaviors if the message
4694 * does not fit in the user's buffer, but this seems to be the
4695 * only way to honor MSG_DONTWAIT realistically.
4697 sctp_release_sock(sk
);
4698 *timeo_p
= schedule_timeout(*timeo_p
);
4702 finish_wait(sk
->sk_sleep
, &wait
);
4706 error
= sock_intr_errno(*timeo_p
);
4709 finish_wait(sk
->sk_sleep
, &wait
);
4714 /* Receive a datagram.
4715 * Note: This is pretty much the same routine as in core/datagram.c
4716 * with a few changes to make lksctp work.
4718 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
4719 int noblock
, int *err
)
4722 struct sk_buff
*skb
;
4725 /* Caller is allowed not to check sk->sk_err before calling. */
4726 error
= sock_error(sk
);
4730 timeo
= sock_rcvtimeo(sk
, noblock
);
4732 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
4733 timeo
, MAX_SCHEDULE_TIMEOUT
);
4736 /* Again only user level code calls this function,
4737 * so nothing interrupt level
4738 * will suddenly eat the receive_queue.
4740 * Look at current nfs client by the way...
4741 * However, this function was corrent in any case. 8)
4743 if (flags
& MSG_PEEK
) {
4744 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
4745 skb
= skb_peek(&sk
->sk_receive_queue
);
4747 atomic_inc(&skb
->users
);
4748 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
4750 skb
= skb_dequeue(&sk
->sk_receive_queue
);
4756 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
4759 /* User doesn't want to wait. */
4763 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
4772 /* If sndbuf has changed, wake up per association sndbuf waiters. */
4773 static void __sctp_write_space(struct sctp_association
*asoc
)
4775 struct sock
*sk
= asoc
->base
.sk
;
4776 struct socket
*sock
= sk
->sk_socket
;
4778 if ((sctp_wspace(asoc
) > 0) && sock
) {
4779 if (waitqueue_active(&asoc
->wait
))
4780 wake_up_interruptible(&asoc
->wait
);
4782 if (sctp_writeable(sk
)) {
4783 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
4784 wake_up_interruptible(sk
->sk_sleep
);
4786 /* Note that we try to include the Async I/O support
4787 * here by modeling from the current TCP/UDP code.
4788 * We have not tested with it yet.
4790 if (sock
->fasync_list
&&
4791 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
4792 sock_wake_async(sock
, 2, POLL_OUT
);
4797 /* Do accounting for the sndbuf space.
4798 * Decrement the used sndbuf space of the corresponding association by the
4799 * data size which was just transmitted(freed).
4801 static void sctp_wfree(struct sk_buff
*skb
)
4803 struct sctp_association
*asoc
;
4804 struct sctp_chunk
*chunk
;
4807 /* Get the saved chunk pointer. */
4808 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
4811 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
4812 sizeof(struct sk_buff
) +
4813 sizeof(struct sctp_chunk
);
4815 sk
->sk_wmem_queued
-= SCTP_DATA_SNDSIZE(chunk
) +
4816 sizeof(struct sk_buff
) +
4817 sizeof(struct sctp_chunk
);
4819 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
4822 __sctp_write_space(asoc
);
4824 sctp_association_put(asoc
);
4827 /* Helper function to wait for space in the sndbuf. */
4828 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
4831 struct sock
*sk
= asoc
->base
.sk
;
4833 long current_timeo
= *timeo_p
;
4836 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
4837 asoc
, (long)(*timeo_p
), msg_len
);
4839 /* Increment the association's refcnt. */
4840 sctp_association_hold(asoc
);
4842 /* Wait on the association specific sndbuf space. */
4844 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
4845 TASK_INTERRUPTIBLE
);
4848 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
4851 if (signal_pending(current
))
4852 goto do_interrupted
;
4853 if (msg_len
<= sctp_wspace(asoc
))
4856 /* Let another process have a go. Since we are going
4859 sctp_release_sock(sk
);
4860 current_timeo
= schedule_timeout(current_timeo
);
4863 *timeo_p
= current_timeo
;
4867 finish_wait(&asoc
->wait
, &wait
);
4869 /* Release the association's refcnt. */
4870 sctp_association_put(asoc
);
4879 err
= sock_intr_errno(*timeo_p
);
4887 /* If socket sndbuf has changed, wake up all per association waiters. */
4888 void sctp_write_space(struct sock
*sk
)
4890 struct sctp_association
*asoc
;
4891 struct list_head
*pos
;
4893 /* Wake up the tasks in each wait queue. */
4894 list_for_each(pos
, &((sctp_sk(sk
))->ep
->asocs
)) {
4895 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
4896 __sctp_write_space(asoc
);
4900 /* Is there any sndbuf space available on the socket?
4902 * Note that wmem_queued is the sum of the send buffers on all of the
4903 * associations on the same socket. For a UDP-style socket with
4904 * multiple associations, it is possible for it to be "unwriteable"
4905 * prematurely. I assume that this is acceptable because
4906 * a premature "unwriteable" is better than an accidental "writeable" which
4907 * would cause an unwanted block under certain circumstances. For the 1-1
4908 * UDP-style sockets or TCP-style sockets, this code should work.
4911 static int sctp_writeable(struct sock
*sk
)
4915 amt
= sk
->sk_sndbuf
- sk
->sk_wmem_queued
;
4921 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
4922 * returns immediately with EINPROGRESS.
4924 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
4926 struct sock
*sk
= asoc
->base
.sk
;
4928 long current_timeo
= *timeo_p
;
4931 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __FUNCTION__
, asoc
,
4934 /* Increment the association's refcnt. */
4935 sctp_association_hold(asoc
);
4938 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
4939 TASK_INTERRUPTIBLE
);
4942 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
4944 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
4947 if (signal_pending(current
))
4948 goto do_interrupted
;
4950 if (sctp_state(asoc
, ESTABLISHED
))
4953 /* Let another process have a go. Since we are going
4956 sctp_release_sock(sk
);
4957 current_timeo
= schedule_timeout(current_timeo
);
4960 *timeo_p
= current_timeo
;
4964 finish_wait(&asoc
->wait
, &wait
);
4966 /* Release the association's refcnt. */
4967 sctp_association_put(asoc
);
4972 if (asoc
->init_err_counter
+ 1 >= asoc
->max_init_attempts
)
4975 err
= -ECONNREFUSED
;
4979 err
= sock_intr_errno(*timeo_p
);
4987 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
4989 struct sctp_endpoint
*ep
;
4993 ep
= sctp_sk(sk
)->ep
;
4997 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
,
4998 TASK_INTERRUPTIBLE
);
5000 if (list_empty(&ep
->asocs
)) {
5001 sctp_release_sock(sk
);
5002 timeo
= schedule_timeout(timeo
);
5007 if (!sctp_sstate(sk
, LISTENING
))
5011 if (!list_empty(&ep
->asocs
))
5014 err
= sock_intr_errno(timeo
);
5015 if (signal_pending(current
))
5023 finish_wait(sk
->sk_sleep
, &wait
);
5028 void sctp_wait_for_close(struct sock
*sk
, long timeout
)
5033 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5034 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
5036 sctp_release_sock(sk
);
5037 timeout
= schedule_timeout(timeout
);
5039 } while (!signal_pending(current
) && timeout
);
5041 finish_wait(sk
->sk_sleep
, &wait
);
5044 /* Populate the fields of the newsk from the oldsk and migrate the assoc
5045 * and its messages to the newsk.
5047 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
5048 struct sctp_association
*assoc
,
5049 sctp_socket_type_t type
)
5051 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
5052 struct sctp_sock
*newsp
= sctp_sk(newsk
);
5053 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5054 struct sctp_endpoint
*newep
= newsp
->ep
;
5055 struct sk_buff
*skb
, *tmp
;
5056 struct sctp_ulpevent
*event
;
5059 /* Migrate socket buffer sizes and all the socket level options to the
5062 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
5063 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
5064 /* Brute force copy old sctp opt. */
5065 inet_sk_copy_descendant(newsk
, oldsk
);
5067 /* Restore the ep value that was overwritten with the above structure
5073 /* Hook this new socket in to the bind_hash list. */
5074 pp
= sctp_sk(oldsk
)->bind_hash
;
5075 sk_add_bind_node(newsk
, &pp
->owner
);
5076 sctp_sk(newsk
)->bind_hash
= pp
;
5077 inet_sk(newsk
)->num
= inet_sk(oldsk
)->num
;
5079 /* Copy the bind_addr list from the original endpoint to the new
5080 * endpoint so that we can handle restarts properly
5082 if (assoc
->peer
.ipv4_address
)
5083 flags
|= SCTP_ADDR4_PEERSUPP
;
5084 if (assoc
->peer
.ipv6_address
)
5085 flags
|= SCTP_ADDR6_PEERSUPP
;
5086 sctp_bind_addr_copy(&newsp
->ep
->base
.bind_addr
,
5087 &oldsp
->ep
->base
.bind_addr
,
5088 SCTP_SCOPE_GLOBAL
, GFP_KERNEL
, flags
);
5090 /* Move any messages in the old socket's receive queue that are for the
5091 * peeled off association to the new socket's receive queue.
5093 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
5094 event
= sctp_skb2event(skb
);
5095 if (event
->asoc
== assoc
) {
5096 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
5097 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
5101 /* Clean up any messages pending delivery due to partial
5102 * delivery. Three cases:
5103 * 1) No partial deliver; no work.
5104 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
5105 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
5107 skb_queue_head_init(&newsp
->pd_lobby
);
5108 sctp_sk(newsk
)->pd_mode
= assoc
->ulpq
.pd_mode
;
5110 if (sctp_sk(oldsk
)->pd_mode
) {
5111 struct sk_buff_head
*queue
;
5113 /* Decide which queue to move pd_lobby skbs to. */
5114 if (assoc
->ulpq
.pd_mode
) {
5115 queue
= &newsp
->pd_lobby
;
5117 queue
= &newsk
->sk_receive_queue
;
5119 /* Walk through the pd_lobby, looking for skbs that
5120 * need moved to the new socket.
5122 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
5123 event
= sctp_skb2event(skb
);
5124 if (event
->asoc
== assoc
) {
5125 __skb_unlink(skb
, &oldsp
->pd_lobby
);
5126 __skb_queue_tail(queue
, skb
);
5130 /* Clear up any skbs waiting for the partial
5131 * delivery to finish.
5133 if (assoc
->ulpq
.pd_mode
)
5134 sctp_clear_pd(oldsk
);
5138 /* Set the type of socket to indicate that it is peeled off from the
5139 * original UDP-style socket or created with the accept() call on a
5140 * TCP-style socket..
5144 /* Migrate the association to the new socket. */
5145 sctp_assoc_migrate(assoc
, newsk
);
5147 /* If the association on the newsk is already closed before accept()
5148 * is called, set RCV_SHUTDOWN flag.
5150 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
5151 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
5153 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
5156 /* This proto struct describes the ULP interface for SCTP. */
5157 struct proto sctp_prot
= {
5159 .owner
= THIS_MODULE
,
5160 .close
= sctp_close
,
5161 .connect
= sctp_connect
,
5162 .disconnect
= sctp_disconnect
,
5163 .accept
= sctp_accept
,
5164 .ioctl
= sctp_ioctl
,
5165 .init
= sctp_init_sock
,
5166 .destroy
= sctp_destroy_sock
,
5167 .shutdown
= sctp_shutdown
,
5168 .setsockopt
= sctp_setsockopt
,
5169 .getsockopt
= sctp_getsockopt
,
5170 .sendmsg
= sctp_sendmsg
,
5171 .recvmsg
= sctp_recvmsg
,
5173 .backlog_rcv
= sctp_backlog_rcv
,
5175 .unhash
= sctp_unhash
,
5176 .get_port
= sctp_get_port
,
5177 .obj_size
= sizeof(struct sctp_sock
),
5180 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5181 struct proto sctpv6_prot
= {
5183 .owner
= THIS_MODULE
,
5184 .close
= sctp_close
,
5185 .connect
= sctp_connect
,
5186 .disconnect
= sctp_disconnect
,
5187 .accept
= sctp_accept
,
5188 .ioctl
= sctp_ioctl
,
5189 .init
= sctp_init_sock
,
5190 .destroy
= sctp_destroy_sock
,
5191 .shutdown
= sctp_shutdown
,
5192 .setsockopt
= sctp_setsockopt
,
5193 .getsockopt
= sctp_getsockopt
,
5194 .sendmsg
= sctp_sendmsg
,
5195 .recvmsg
= sctp_recvmsg
,
5197 .backlog_rcv
= sctp_backlog_rcv
,
5199 .unhash
= sctp_unhash
,
5200 .get_port
= sctp_get_port
,
5201 .obj_size
= sizeof(struct sctp6_sock
),
5203 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */