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 * If an unprivileged user inherits a 1-many
1016 * style socket with open associations on a
1017 * privileged port, it MAY be permitted to
1018 * accept new associations, but it SHOULD NOT
1019 * be permitted to open new associations.
1021 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1022 !capable(CAP_NET_BIND_SERVICE
)) {
1028 scope
= sctp_scope(&to
);
1029 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1036 /* Prime the peer's transport structures. */
1037 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1045 addr_buf
+= af
->sockaddr_len
;
1046 walk_size
+= af
->sockaddr_len
;
1049 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1054 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1059 /* Initialize sk's dport and daddr for getpeername() */
1060 inet_sk(sk
)->dport
= htons(asoc
->peer
.port
);
1061 af
= sctp_get_af_specific(to
.sa
.sa_family
);
1062 af
->to_sk_daddr(&to
, sk
);
1064 timeo
= sock_sndtimeo(sk
, sk
->sk_socket
->file
->f_flags
& O_NONBLOCK
);
1065 err
= sctp_wait_for_connect(asoc
, &timeo
);
1067 /* Don't free association on exit. */
1072 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1073 " kaddrs: %p err: %d\n",
1076 sctp_association_free(asoc
);
1080 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1083 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
1085 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1086 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1087 * or IPv6 addresses.
1089 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1090 * Section 3.1.2 for this usage.
1092 * addrs is a pointer to an array of one or more socket addresses. Each
1093 * address is contained in its appropriate structure (i.e. struct
1094 * sockaddr_in or struct sockaddr_in6) the family of the address type
1095 * must be used to distengish the address length (note that this
1096 * representation is termed a "packed array" of addresses). The caller
1097 * specifies the number of addresses in the array with addrcnt.
1099 * On success, sctp_connectx() returns 0. On failure, sctp_connectx() returns
1100 * -1, and sets errno to the appropriate error code.
1102 * For SCTP, the port given in each socket address must be the same, or
1103 * sctp_connectx() will fail, setting errno to EINVAL.
1105 * An application can use sctp_connectx to initiate an association with
1106 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1107 * allows a caller to specify multiple addresses at which a peer can be
1108 * reached. The way the SCTP stack uses the list of addresses to set up
1109 * the association is implementation dependant. This function only
1110 * specifies that the stack will try to make use of all the addresses in
1111 * the list when needed.
1113 * Note that the list of addresses passed in is only used for setting up
1114 * the association. It does not necessarily equal the set of addresses
1115 * the peer uses for the resulting association. If the caller wants to
1116 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1117 * retrieve them after the association has been set up.
1119 * Basically do nothing but copying the addresses from user to kernel
1120 * land and invoking either sctp_connectx(). This is used for tunneling
1121 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1123 * We don't use copy_from_user() for optimization: we first do the
1124 * sanity checks (buffer size -fast- and access check-healthy
1125 * pointer); if all of those succeed, then we can alloc the memory
1126 * (expensive operation) needed to copy the data to kernel. Then we do
1127 * the copying without checking the user space area
1128 * (__copy_from_user()).
1130 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1133 * sk The sk of the socket
1134 * addrs The pointer to the addresses in user land
1135 * addrssize Size of the addrs buffer
1137 * Returns 0 if ok, <0 errno code on error.
1139 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1140 struct sockaddr __user
*addrs
,
1144 struct sockaddr
*kaddrs
;
1146 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1147 __FUNCTION__
, sk
, addrs
, addrs_size
);
1149 if (unlikely(addrs_size
<= 0))
1152 /* Check the user passed a healthy pointer. */
1153 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1156 /* Alloc space for the address array in kernel memory. */
1157 kaddrs
= (struct sockaddr
*)kmalloc(addrs_size
, GFP_KERNEL
);
1158 if (unlikely(!kaddrs
))
1161 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1164 err
= __sctp_connect(sk
, kaddrs
, addrs_size
);
1171 /* API 3.1.4 close() - UDP Style Syntax
1172 * Applications use close() to perform graceful shutdown (as described in
1173 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1174 * by a UDP-style socket.
1178 * ret = close(int sd);
1180 * sd - the socket descriptor of the associations to be closed.
1182 * To gracefully shutdown a specific association represented by the
1183 * UDP-style socket, an application should use the sendmsg() call,
1184 * passing no user data, but including the appropriate flag in the
1185 * ancillary data (see Section xxxx).
1187 * If sd in the close() call is a branched-off socket representing only
1188 * one association, the shutdown is performed on that association only.
1190 * 4.1.6 close() - TCP Style Syntax
1192 * Applications use close() to gracefully close down an association.
1196 * int close(int sd);
1198 * sd - the socket descriptor of the association to be closed.
1200 * After an application calls close() on a socket descriptor, no further
1201 * socket operations will succeed on that descriptor.
1203 * API 7.1.4 SO_LINGER
1205 * An application using the TCP-style socket can use this option to
1206 * perform the SCTP ABORT primitive. The linger option structure is:
1209 * int l_onoff; // option on/off
1210 * int l_linger; // linger time
1213 * To enable the option, set l_onoff to 1. If the l_linger value is set
1214 * to 0, calling close() is the same as the ABORT primitive. If the
1215 * value is set to a negative value, the setsockopt() call will return
1216 * an error. If the value is set to a positive value linger_time, the
1217 * close() can be blocked for at most linger_time ms. If the graceful
1218 * shutdown phase does not finish during this period, close() will
1219 * return but the graceful shutdown phase continues in the system.
1221 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1223 struct sctp_endpoint
*ep
;
1224 struct sctp_association
*asoc
;
1225 struct list_head
*pos
, *temp
;
1227 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1230 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1232 ep
= sctp_sk(sk
)->ep
;
1234 /* Walk all associations on a socket, not on an endpoint. */
1235 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1236 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1238 if (sctp_style(sk
, TCP
)) {
1239 /* A closed association can still be in the list if
1240 * it belongs to a TCP-style listening socket that is
1241 * not yet accepted. If so, free it. If not, send an
1242 * ABORT or SHUTDOWN based on the linger options.
1244 if (sctp_state(asoc
, CLOSED
)) {
1245 sctp_unhash_established(asoc
);
1246 sctp_association_free(asoc
);
1248 } else if (sock_flag(sk
, SOCK_LINGER
) &&
1250 sctp_primitive_ABORT(asoc
, NULL
);
1252 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1254 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1257 /* Clean up any skbs sitting on the receive queue. */
1258 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1259 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1261 /* On a TCP-style socket, block for at most linger_time if set. */
1262 if (sctp_style(sk
, TCP
) && timeout
)
1263 sctp_wait_for_close(sk
, timeout
);
1265 /* This will run the backlog queue. */
1266 sctp_release_sock(sk
);
1268 /* Supposedly, no process has access to the socket, but
1269 * the net layers still may.
1271 sctp_local_bh_disable();
1272 sctp_bh_lock_sock(sk
);
1274 /* Hold the sock, since sk_common_release() will put sock_put()
1275 * and we have just a little more cleanup.
1278 sk_common_release(sk
);
1280 sctp_bh_unlock_sock(sk
);
1281 sctp_local_bh_enable();
1285 SCTP_DBG_OBJCNT_DEC(sock
);
1288 /* Handle EPIPE error. */
1289 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1292 err
= sock_error(sk
) ? : -EPIPE
;
1293 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1294 send_sig(SIGPIPE
, current
, 0);
1298 /* API 3.1.3 sendmsg() - UDP Style Syntax
1300 * An application uses sendmsg() and recvmsg() calls to transmit data to
1301 * and receive data from its peer.
1303 * ssize_t sendmsg(int socket, const struct msghdr *message,
1306 * socket - the socket descriptor of the endpoint.
1307 * message - pointer to the msghdr structure which contains a single
1308 * user message and possibly some ancillary data.
1310 * See Section 5 for complete description of the data
1313 * flags - flags sent or received with the user message, see Section
1314 * 5 for complete description of the flags.
1316 * Note: This function could use a rewrite especially when explicit
1317 * connect support comes in.
1319 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1321 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1323 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1324 struct msghdr
*msg
, size_t msg_len
)
1326 struct sctp_sock
*sp
;
1327 struct sctp_endpoint
*ep
;
1328 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1329 struct sctp_transport
*transport
, *chunk_tp
;
1330 struct sctp_chunk
*chunk
;
1332 struct sockaddr
*msg_name
= NULL
;
1333 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1334 struct sctp_sndrcvinfo
*sinfo
;
1335 struct sctp_initmsg
*sinit
;
1336 sctp_assoc_t associd
= 0;
1337 sctp_cmsgs_t cmsgs
= { NULL
};
1341 __u16 sinfo_flags
= 0;
1342 struct sctp_datamsg
*datamsg
;
1343 struct list_head
*pos
;
1344 int msg_flags
= msg
->msg_flags
;
1346 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1353 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1355 /* We cannot send a message over a TCP-style listening socket. */
1356 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1361 /* Parse out the SCTP CMSGs. */
1362 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1365 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1369 /* Fetch the destination address for this packet. This
1370 * address only selects the association--it is not necessarily
1371 * the address we will send to.
1372 * For a peeled-off socket, msg_name is ignored.
1374 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1375 int msg_namelen
= msg
->msg_namelen
;
1377 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1382 if (msg_namelen
> sizeof(to
))
1383 msg_namelen
= sizeof(to
);
1384 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1385 SCTP_DEBUG_PRINTK("Just memcpy'd. msg_name is "
1387 to
.v4
.sin_addr
.s_addr
, to
.v4
.sin_port
);
1389 to
.v4
.sin_port
= ntohs(to
.v4
.sin_port
);
1390 msg_name
= msg
->msg_name
;
1396 /* Did the user specify SNDRCVINFO? */
1398 sinfo_flags
= sinfo
->sinfo_flags
;
1399 associd
= sinfo
->sinfo_assoc_id
;
1402 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1403 msg_len
, sinfo_flags
);
1405 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1406 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1411 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1412 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1413 * If SCTP_ABORT is set, the message length could be non zero with
1414 * the msg_iov set to the user abort reason.
1416 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1417 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1422 /* If SCTP_ADDR_OVER is set, there must be an address
1423 * specified in msg_name.
1425 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1432 SCTP_DEBUG_PRINTK("About to look up association.\n");
1436 /* If a msg_name has been specified, assume this is to be used. */
1438 /* Look for a matching association on the endpoint. */
1439 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1441 /* If we could not find a matching association on the
1442 * endpoint, make sure that it is not a TCP-style
1443 * socket that already has an association or there is
1444 * no peeled-off association on another socket.
1446 if ((sctp_style(sk
, TCP
) &&
1447 sctp_sstate(sk
, ESTABLISHED
)) ||
1448 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1449 err
= -EADDRNOTAVAIL
;
1454 asoc
= sctp_id2assoc(sk
, associd
);
1462 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1464 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1465 * socket that has an association in CLOSED state. This can
1466 * happen when an accepted socket has an association that is
1469 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1474 if (sinfo_flags
& SCTP_EOF
) {
1475 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1477 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1481 if (sinfo_flags
& SCTP_ABORT
) {
1482 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1483 sctp_primitive_ABORT(asoc
, msg
);
1489 /* Do we need to create the association? */
1491 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1493 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1498 /* Check for invalid stream against the stream counts,
1499 * either the default or the user specified stream counts.
1502 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1503 /* Check against the defaults. */
1504 if (sinfo
->sinfo_stream
>=
1505 sp
->initmsg
.sinit_num_ostreams
) {
1510 /* Check against the requested. */
1511 if (sinfo
->sinfo_stream
>=
1512 sinit
->sinit_num_ostreams
) {
1520 * API 3.1.2 bind() - UDP Style Syntax
1521 * If a bind() or sctp_bindx() is not called prior to a
1522 * sendmsg() call that initiates a new association, the
1523 * system picks an ephemeral port and will choose an address
1524 * set equivalent to binding with a wildcard address.
1526 if (!ep
->base
.bind_addr
.port
) {
1527 if (sctp_autobind(sk
)) {
1533 * If an unprivileged user inherits a one-to-many
1534 * style socket with open associations on a privileged
1535 * port, it MAY be permitted to accept new associations,
1536 * but it SHOULD NOT be permitted to open new
1539 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1540 !capable(CAP_NET_BIND_SERVICE
)) {
1546 scope
= sctp_scope(&to
);
1547 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1554 /* If the SCTP_INIT ancillary data is specified, set all
1555 * the association init values accordingly.
1558 if (sinit
->sinit_num_ostreams
) {
1559 asoc
->c
.sinit_num_ostreams
=
1560 sinit
->sinit_num_ostreams
;
1562 if (sinit
->sinit_max_instreams
) {
1563 asoc
->c
.sinit_max_instreams
=
1564 sinit
->sinit_max_instreams
;
1566 if (sinit
->sinit_max_attempts
) {
1567 asoc
->max_init_attempts
1568 = sinit
->sinit_max_attempts
;
1570 if (sinit
->sinit_max_init_timeo
) {
1571 asoc
->max_init_timeo
=
1572 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1576 /* Prime the peer's transport structures. */
1577 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1582 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1589 /* ASSERT: we have a valid association at this point. */
1590 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1593 /* If the user didn't specify SNDRCVINFO, make up one with
1596 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1597 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1598 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1599 default_sinfo
.sinfo_context
= asoc
->default_context
;
1600 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1601 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1602 sinfo
= &default_sinfo
;
1605 /* API 7.1.7, the sndbuf size per association bounds the
1606 * maximum size of data that can be sent in a single send call.
1608 if (msg_len
> sk
->sk_sndbuf
) {
1613 /* If fragmentation is disabled and the message length exceeds the
1614 * association fragmentation point, return EMSGSIZE. The I-D
1615 * does not specify what this error is, but this looks like
1618 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1624 /* Check for invalid stream. */
1625 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1631 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1632 if (!sctp_wspace(asoc
)) {
1633 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1638 /* If an address is passed with the sendto/sendmsg call, it is used
1639 * to override the primary destination address in the TCP model, or
1640 * when SCTP_ADDR_OVER flag is set in the UDP model.
1642 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1643 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1644 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1652 /* Auto-connect, if we aren't connected already. */
1653 if (sctp_state(asoc
, CLOSED
)) {
1654 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1657 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1660 /* Break the message into multiple chunks of maximum size. */
1661 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1667 /* Now send the (possibly) fragmented message. */
1668 list_for_each(pos
, &datamsg
->chunks
) {
1669 chunk
= list_entry(pos
, struct sctp_chunk
, frag_list
);
1670 sctp_datamsg_track(chunk
);
1672 /* Do accounting for the write space. */
1673 sctp_set_owner_w(chunk
);
1675 chunk
->transport
= chunk_tp
;
1677 /* Send it to the lower layers. Note: all chunks
1678 * must either fail or succeed. The lower layer
1679 * works that way today. Keep it that way or this
1682 err
= sctp_primitive_SEND(asoc
, chunk
);
1683 /* Did the lower layer accept the chunk? */
1685 sctp_chunk_free(chunk
);
1686 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1689 sctp_datamsg_free(datamsg
);
1695 /* If we are already past ASSOCIATE, the lower
1696 * layers are responsible for association cleanup.
1702 sctp_association_free(asoc
);
1704 sctp_release_sock(sk
);
1707 return sctp_error(sk
, msg_flags
, err
);
1714 err
= sock_error(sk
);
1724 /* This is an extended version of skb_pull() that removes the data from the
1725 * start of a skb even when data is spread across the list of skb's in the
1726 * frag_list. len specifies the total amount of data that needs to be removed.
1727 * when 'len' bytes could be removed from the skb, it returns 0.
1728 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1729 * could not be removed.
1731 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1733 struct sk_buff
*list
;
1734 int skb_len
= skb_headlen(skb
);
1737 if (len
<= skb_len
) {
1738 __skb_pull(skb
, len
);
1742 __skb_pull(skb
, skb_len
);
1744 for (list
= skb_shinfo(skb
)->frag_list
; list
; list
= list
->next
) {
1745 rlen
= sctp_skb_pull(list
, len
);
1746 skb
->len
-= (len
-rlen
);
1747 skb
->data_len
-= (len
-rlen
);
1758 /* API 3.1.3 recvmsg() - UDP Style Syntax
1760 * ssize_t recvmsg(int socket, struct msghdr *message,
1763 * socket - the socket descriptor of the endpoint.
1764 * message - pointer to the msghdr structure which contains a single
1765 * user message and possibly some ancillary data.
1767 * See Section 5 for complete description of the data
1770 * flags - flags sent or received with the user message, see Section
1771 * 5 for complete description of the flags.
1773 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1775 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1776 struct msghdr
*msg
, size_t len
, int noblock
,
1777 int flags
, int *addr_len
)
1779 struct sctp_ulpevent
*event
= NULL
;
1780 struct sctp_sock
*sp
= sctp_sk(sk
);
1781 struct sk_buff
*skb
;
1786 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1787 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1788 "len", len
, "knoblauch", noblock
,
1789 "flags", flags
, "addr_len", addr_len
);
1793 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1798 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1802 /* Get the total length of the skb including any skb's in the
1811 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1813 event
= sctp_skb2event(skb
);
1818 sock_recv_timestamp(msg
, sk
, skb
);
1819 if (sctp_ulpevent_is_notification(event
)) {
1820 msg
->msg_flags
|= MSG_NOTIFICATION
;
1821 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1823 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1826 /* Check if we allow SCTP_SNDRCVINFO. */
1827 if (sp
->subscribe
.sctp_data_io_event
)
1828 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1830 /* FIXME: we should be calling IP/IPv6 layers. */
1831 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1832 ip_cmsg_recv(msg
, skb
);
1837 /* If skb's length exceeds the user's buffer, update the skb and
1838 * push it back to the receive_queue so that the next call to
1839 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1841 if (skb_len
> copied
) {
1842 msg
->msg_flags
&= ~MSG_EOR
;
1843 if (flags
& MSG_PEEK
)
1845 sctp_skb_pull(skb
, copied
);
1846 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1848 /* When only partial message is copied to the user, increase
1849 * rwnd by that amount. If all the data in the skb is read,
1850 * rwnd is updated when the event is freed.
1852 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
1854 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
1855 (event
->msg_flags
& MSG_EOR
))
1856 msg
->msg_flags
|= MSG_EOR
;
1858 msg
->msg_flags
&= ~MSG_EOR
;
1861 if (flags
& MSG_PEEK
) {
1862 /* Release the skb reference acquired after peeking the skb in
1863 * sctp_skb_recv_datagram().
1867 /* Free the event which includes releasing the reference to
1868 * the owner of the skb, freeing the skb and updating the
1871 sctp_ulpevent_free(event
);
1874 sctp_release_sock(sk
);
1878 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1880 * This option is a on/off flag. If enabled no SCTP message
1881 * fragmentation will be performed. Instead if a message being sent
1882 * exceeds the current PMTU size, the message will NOT be sent and
1883 * instead a error will be indicated to the user.
1885 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
1886 char __user
*optval
, int optlen
)
1890 if (optlen
< sizeof(int))
1893 if (get_user(val
, (int __user
*)optval
))
1896 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
1901 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
1904 if (optlen
!= sizeof(struct sctp_event_subscribe
))
1906 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
1911 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
1913 * This socket option is applicable to the UDP-style socket only. When
1914 * set it will cause associations that are idle for more than the
1915 * specified number of seconds to automatically close. An association
1916 * being idle is defined an association that has NOT sent or received
1917 * user data. The special value of '0' indicates that no automatic
1918 * close of any associations should be performed. The option expects an
1919 * integer defining the number of seconds of idle time before an
1920 * association is closed.
1922 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
1925 struct sctp_sock
*sp
= sctp_sk(sk
);
1927 /* Applicable to UDP-style socket only */
1928 if (sctp_style(sk
, TCP
))
1930 if (optlen
!= sizeof(int))
1932 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
1938 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
1940 * Applications can enable or disable heartbeats for any peer address of
1941 * an association, modify an address's heartbeat interval, force a
1942 * heartbeat to be sent immediately, and adjust the address's maximum
1943 * number of retransmissions sent before an address is considered
1944 * unreachable. The following structure is used to access and modify an
1945 * address's parameters:
1947 * struct sctp_paddrparams {
1948 * sctp_assoc_t spp_assoc_id;
1949 * struct sockaddr_storage spp_address;
1950 * uint32_t spp_hbinterval;
1951 * uint16_t spp_pathmaxrxt;
1954 * spp_assoc_id - (UDP style socket) This is filled in the application,
1955 * and identifies the association for this query.
1956 * spp_address - This specifies which address is of interest.
1957 * spp_hbinterval - This contains the value of the heartbeat interval,
1958 * in milliseconds. A value of 0, when modifying the
1959 * parameter, specifies that the heartbeat on this
1960 * address should be disabled. A value of UINT32_MAX
1961 * (4294967295), when modifying the parameter,
1962 * specifies that a heartbeat should be sent
1963 * immediately to the peer address, and the current
1964 * interval should remain unchanged.
1965 * spp_pathmaxrxt - This contains the maximum number of
1966 * retransmissions before this address shall be
1967 * considered unreachable.
1969 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
1970 char __user
*optval
, int optlen
)
1972 struct sctp_paddrparams params
;
1973 struct sctp_transport
*trans
;
1976 if (optlen
!= sizeof(struct sctp_paddrparams
))
1978 if (copy_from_user(¶ms
, optval
, optlen
))
1982 * API 7. Socket Options (setting the default value for the endpoint)
1983 * All options that support specific settings on an association by
1984 * filling in either an association id variable or a sockaddr_storage
1985 * SHOULD also support setting of the same value for the entire endpoint
1986 * (i.e. future associations). To accomplish this the following logic is
1987 * used when setting one of these options:
1989 * c) If neither the sockaddr_storage or association identification is
1990 * set i.e. the sockaddr_storage is set to all 0's (INADDR_ANY) and
1991 * the association identification is 0, the settings are a default
1992 * and to be applied to the endpoint (all future associations).
1995 /* update default value for endpoint (all future associations) */
1996 if (!params
.spp_assoc_id
&&
1997 sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
1998 /* Manual heartbeat on an endpoint is invalid. */
1999 if (0xffffffff == params
.spp_hbinterval
)
2001 else if (params
.spp_hbinterval
)
2002 sctp_sk(sk
)->paddrparam
.spp_hbinterval
=
2003 params
.spp_hbinterval
;
2004 if (params
.spp_pathmaxrxt
)
2005 sctp_sk(sk
)->paddrparam
.spp_pathmaxrxt
=
2006 params
.spp_pathmaxrxt
;
2010 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2011 params
.spp_assoc_id
);
2015 /* Applications can enable or disable heartbeats for any peer address
2016 * of an association, modify an address's heartbeat interval, force a
2017 * heartbeat to be sent immediately, and adjust the address's maximum
2018 * number of retransmissions sent before an address is considered
2021 * The value of the heartbeat interval, in milliseconds. A value of
2022 * UINT32_MAX (4294967295), when modifying the parameter, specifies
2023 * that a heartbeat should be sent immediately to the peer address,
2024 * and the current interval should remain unchanged.
2026 if (0xffffffff == params
.spp_hbinterval
) {
2027 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2031 /* The value of the heartbeat interval, in milliseconds. A value of 0,
2032 * when modifying the parameter, specifies that the heartbeat on this
2033 * address should be disabled.
2035 if (params
.spp_hbinterval
) {
2036 trans
->hb_allowed
= 1;
2037 trans
->hb_interval
=
2038 msecs_to_jiffies(params
.spp_hbinterval
);
2040 trans
->hb_allowed
= 0;
2043 /* spp_pathmaxrxt contains the maximum number of retransmissions
2044 * before this address shall be considered unreachable.
2046 if (params
.spp_pathmaxrxt
)
2047 trans
->max_retrans
= params
.spp_pathmaxrxt
;
2052 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2054 * Applications can specify protocol parameters for the default association
2055 * initialization. The option name argument to setsockopt() and getsockopt()
2058 * Setting initialization parameters is effective only on an unconnected
2059 * socket (for UDP-style sockets only future associations are effected
2060 * by the change). With TCP-style sockets, this option is inherited by
2061 * sockets derived from a listener socket.
2063 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, int optlen
)
2065 struct sctp_initmsg sinit
;
2066 struct sctp_sock
*sp
= sctp_sk(sk
);
2068 if (optlen
!= sizeof(struct sctp_initmsg
))
2070 if (copy_from_user(&sinit
, optval
, optlen
))
2073 if (sinit
.sinit_num_ostreams
)
2074 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2075 if (sinit
.sinit_max_instreams
)
2076 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2077 if (sinit
.sinit_max_attempts
)
2078 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2079 if (sinit
.sinit_max_init_timeo
)
2080 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2086 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2088 * Applications that wish to use the sendto() system call may wish to
2089 * specify a default set of parameters that would normally be supplied
2090 * through the inclusion of ancillary data. This socket option allows
2091 * such an application to set the default sctp_sndrcvinfo structure.
2092 * The application that wishes to use this socket option simply passes
2093 * in to this call the sctp_sndrcvinfo structure defined in Section
2094 * 5.2.2) The input parameters accepted by this call include
2095 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2096 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2097 * to this call if the caller is using the UDP model.
2099 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2100 char __user
*optval
, int optlen
)
2102 struct sctp_sndrcvinfo info
;
2103 struct sctp_association
*asoc
;
2104 struct sctp_sock
*sp
= sctp_sk(sk
);
2106 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2108 if (copy_from_user(&info
, optval
, optlen
))
2111 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2112 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2116 asoc
->default_stream
= info
.sinfo_stream
;
2117 asoc
->default_flags
= info
.sinfo_flags
;
2118 asoc
->default_ppid
= info
.sinfo_ppid
;
2119 asoc
->default_context
= info
.sinfo_context
;
2120 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2122 sp
->default_stream
= info
.sinfo_stream
;
2123 sp
->default_flags
= info
.sinfo_flags
;
2124 sp
->default_ppid
= info
.sinfo_ppid
;
2125 sp
->default_context
= info
.sinfo_context
;
2126 sp
->default_timetolive
= info
.sinfo_timetolive
;
2132 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2134 * Requests that the local SCTP stack use the enclosed peer address as
2135 * the association primary. The enclosed address must be one of the
2136 * association peer's addresses.
2138 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2141 struct sctp_prim prim
;
2142 struct sctp_transport
*trans
;
2144 if (optlen
!= sizeof(struct sctp_prim
))
2147 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2150 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2154 sctp_assoc_set_primary(trans
->asoc
, trans
);
2160 * 7.1.5 SCTP_NODELAY
2162 * Turn on/off any Nagle-like algorithm. This means that packets are
2163 * generally sent as soon as possible and no unnecessary delays are
2164 * introduced, at the cost of more packets in the network. Expects an
2165 * integer boolean flag.
2167 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2172 if (optlen
< sizeof(int))
2174 if (get_user(val
, (int __user
*)optval
))
2177 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2183 * 7.1.1 SCTP_RTOINFO
2185 * The protocol parameters used to initialize and bound retransmission
2186 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2187 * and modify these parameters.
2188 * All parameters are time values, in milliseconds. A value of 0, when
2189 * modifying the parameters, indicates that the current value should not
2193 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, int optlen
) {
2194 struct sctp_rtoinfo rtoinfo
;
2195 struct sctp_association
*asoc
;
2197 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2200 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2203 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2205 /* Set the values to the specific association */
2206 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2210 if (rtoinfo
.srto_initial
!= 0)
2212 msecs_to_jiffies(rtoinfo
.srto_initial
);
2213 if (rtoinfo
.srto_max
!= 0)
2214 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2215 if (rtoinfo
.srto_min
!= 0)
2216 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2218 /* If there is no association or the association-id = 0
2219 * set the values to the endpoint.
2221 struct sctp_sock
*sp
= sctp_sk(sk
);
2223 if (rtoinfo
.srto_initial
!= 0)
2224 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2225 if (rtoinfo
.srto_max
!= 0)
2226 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2227 if (rtoinfo
.srto_min
!= 0)
2228 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2236 * 7.1.2 SCTP_ASSOCINFO
2238 * This option is used to tune the the maximum retransmission attempts
2239 * of the association.
2240 * Returns an error if the new association retransmission value is
2241 * greater than the sum of the retransmission value of the peer.
2242 * See [SCTP] for more information.
2245 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, int optlen
)
2248 struct sctp_assocparams assocparams
;
2249 struct sctp_association
*asoc
;
2251 if (optlen
!= sizeof(struct sctp_assocparams
))
2253 if (copy_from_user(&assocparams
, optval
, optlen
))
2256 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2258 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2261 /* Set the values to the specific association */
2263 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2264 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2265 if (assocparams
.sasoc_cookie_life
!= 0) {
2266 asoc
->cookie_life
.tv_sec
=
2267 assocparams
.sasoc_cookie_life
/ 1000;
2268 asoc
->cookie_life
.tv_usec
=
2269 (assocparams
.sasoc_cookie_life
% 1000)
2273 /* Set the values to the endpoint */
2274 struct sctp_sock
*sp
= sctp_sk(sk
);
2276 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2277 sp
->assocparams
.sasoc_asocmaxrxt
=
2278 assocparams
.sasoc_asocmaxrxt
;
2279 if (assocparams
.sasoc_cookie_life
!= 0)
2280 sp
->assocparams
.sasoc_cookie_life
=
2281 assocparams
.sasoc_cookie_life
;
2287 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2289 * This socket option is a boolean flag which turns on or off mapped V4
2290 * addresses. If this option is turned on and the socket is type
2291 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2292 * If this option is turned off, then no mapping will be done of V4
2293 * addresses and a user will receive both PF_INET6 and PF_INET type
2294 * addresses on the socket.
2296 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, int optlen
)
2299 struct sctp_sock
*sp
= sctp_sk(sk
);
2301 if (optlen
< sizeof(int))
2303 if (get_user(val
, (int __user
*)optval
))
2314 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2316 * This socket option specifies the maximum size to put in any outgoing
2317 * SCTP chunk. If a message is larger than this size it will be
2318 * fragmented by SCTP into the specified size. Note that the underlying
2319 * SCTP implementation may fragment into smaller sized chunks when the
2320 * PMTU of the underlying association is smaller than the value set by
2323 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, int optlen
)
2325 struct sctp_association
*asoc
;
2326 struct list_head
*pos
;
2327 struct sctp_sock
*sp
= sctp_sk(sk
);
2330 if (optlen
< sizeof(int))
2332 if (get_user(val
, (int __user
*)optval
))
2334 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2336 sp
->user_frag
= val
;
2338 /* Update the frag_point of the existing associations. */
2339 list_for_each(pos
, &(sp
->ep
->asocs
)) {
2340 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
2341 asoc
->frag_point
= sctp_frag_point(sp
, asoc
->pmtu
);
2349 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2351 * Requests that the peer mark the enclosed address as the association
2352 * primary. The enclosed address must be one of the association's
2353 * locally bound addresses. The following structure is used to make a
2354 * set primary request:
2356 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2359 struct sctp_sock
*sp
;
2360 struct sctp_endpoint
*ep
;
2361 struct sctp_association
*asoc
= NULL
;
2362 struct sctp_setpeerprim prim
;
2363 struct sctp_chunk
*chunk
;
2369 if (!sctp_addip_enable
)
2372 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2375 if (copy_from_user(&prim
, optval
, optlen
))
2378 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2382 if (!asoc
->peer
.asconf_capable
)
2385 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2388 if (!sctp_state(asoc
, ESTABLISHED
))
2391 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2392 return -EADDRNOTAVAIL
;
2394 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2395 chunk
= sctp_make_asconf_set_prim(asoc
,
2396 (union sctp_addr
*)&prim
.sspp_addr
);
2400 err
= sctp_send_asconf(asoc
, chunk
);
2402 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2407 static int sctp_setsockopt_adaption_layer(struct sock
*sk
, char __user
*optval
,
2410 struct sctp_setadaption adaption
;
2412 if (optlen
!= sizeof(struct sctp_setadaption
))
2414 if (copy_from_user(&adaption
, optval
, optlen
))
2417 sctp_sk(sk
)->adaption_ind
= adaption
.ssb_adaption_ind
;
2422 /* API 6.2 setsockopt(), getsockopt()
2424 * Applications use setsockopt() and getsockopt() to set or retrieve
2425 * socket options. Socket options are used to change the default
2426 * behavior of sockets calls. They are described in Section 7.
2430 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
2431 * int __user *optlen);
2432 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
2435 * sd - the socket descript.
2436 * level - set to IPPROTO_SCTP for all SCTP options.
2437 * optname - the option name.
2438 * optval - the buffer to store the value of the option.
2439 * optlen - the size of the buffer.
2441 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
2442 char __user
*optval
, int optlen
)
2446 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
2449 /* I can hardly begin to describe how wrong this is. This is
2450 * so broken as to be worse than useless. The API draft
2451 * REALLY is NOT helpful here... I am not convinced that the
2452 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
2453 * are at all well-founded.
2455 if (level
!= SOL_SCTP
) {
2456 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
2457 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2464 case SCTP_SOCKOPT_BINDX_ADD
:
2465 /* 'optlen' is the size of the addresses buffer. */
2466 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2467 optlen
, SCTP_BINDX_ADD_ADDR
);
2470 case SCTP_SOCKOPT_BINDX_REM
:
2471 /* 'optlen' is the size of the addresses buffer. */
2472 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2473 optlen
, SCTP_BINDX_REM_ADDR
);
2476 case SCTP_SOCKOPT_CONNECTX
:
2477 /* 'optlen' is the size of the addresses buffer. */
2478 retval
= sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)optval
,
2482 case SCTP_DISABLE_FRAGMENTS
:
2483 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
2487 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
2490 case SCTP_AUTOCLOSE
:
2491 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
2494 case SCTP_PEER_ADDR_PARAMS
:
2495 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
2499 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
2501 case SCTP_DEFAULT_SEND_PARAM
:
2502 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
2505 case SCTP_PRIMARY_ADDR
:
2506 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
2508 case SCTP_SET_PEER_PRIMARY_ADDR
:
2509 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
2512 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
2515 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
2517 case SCTP_ASSOCINFO
:
2518 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
2520 case SCTP_I_WANT_MAPPED_V4_ADDR
:
2521 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
2524 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
2526 case SCTP_ADAPTION_LAYER
:
2527 retval
= sctp_setsockopt_adaption_layer(sk
, optval
, optlen
);
2531 retval
= -ENOPROTOOPT
;
2535 sctp_release_sock(sk
);
2541 /* API 3.1.6 connect() - UDP Style Syntax
2543 * An application may use the connect() call in the UDP model to initiate an
2544 * association without sending data.
2548 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
2550 * sd: the socket descriptor to have a new association added to.
2552 * nam: the address structure (either struct sockaddr_in or struct
2553 * sockaddr_in6 defined in RFC2553 [7]).
2555 * len: the size of the address.
2557 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
2565 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
2566 __FUNCTION__
, sk
, addr
, addr_len
);
2568 /* Validate addr_len before calling common connect/connectx routine. */
2569 af
= sctp_get_af_specific(addr
->sa_family
);
2570 if (!af
|| addr_len
< af
->sockaddr_len
) {
2573 /* Pass correct addr len to common routine (so it knows there
2574 * is only one address being passed.
2576 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
);
2579 sctp_release_sock(sk
);
2583 /* FIXME: Write comments. */
2584 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
2586 return -EOPNOTSUPP
; /* STUB */
2589 /* 4.1.4 accept() - TCP Style Syntax
2591 * Applications use accept() call to remove an established SCTP
2592 * association from the accept queue of the endpoint. A new socket
2593 * descriptor will be returned from accept() to represent the newly
2594 * formed association.
2596 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
2598 struct sctp_sock
*sp
;
2599 struct sctp_endpoint
*ep
;
2600 struct sock
*newsk
= NULL
;
2601 struct sctp_association
*asoc
;
2610 if (!sctp_style(sk
, TCP
)) {
2611 error
= -EOPNOTSUPP
;
2615 if (!sctp_sstate(sk
, LISTENING
)) {
2620 timeo
= sock_rcvtimeo(sk
, sk
->sk_socket
->file
->f_flags
& O_NONBLOCK
);
2622 error
= sctp_wait_for_accept(sk
, timeo
);
2626 /* We treat the list of associations on the endpoint as the accept
2627 * queue and pick the first association on the list.
2629 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
2631 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
2637 /* Populate the fields of the newsk from the oldsk and migrate the
2638 * asoc to the newsk.
2640 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
2643 sctp_release_sock(sk
);
2648 /* The SCTP ioctl handler. */
2649 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
2651 return -ENOIOCTLCMD
;
2654 /* This is the function which gets called during socket creation to
2655 * initialized the SCTP-specific portion of the sock.
2656 * The sock structure should already be zero-filled memory.
2658 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
2660 struct sctp_endpoint
*ep
;
2661 struct sctp_sock
*sp
;
2663 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
2667 /* Initialize the SCTP per socket area. */
2668 switch (sk
->sk_type
) {
2669 case SOCK_SEQPACKET
:
2670 sp
->type
= SCTP_SOCKET_UDP
;
2673 sp
->type
= SCTP_SOCKET_TCP
;
2676 return -ESOCKTNOSUPPORT
;
2679 /* Initialize default send parameters. These parameters can be
2680 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
2682 sp
->default_stream
= 0;
2683 sp
->default_ppid
= 0;
2684 sp
->default_flags
= 0;
2685 sp
->default_context
= 0;
2686 sp
->default_timetolive
= 0;
2688 /* Initialize default setup parameters. These parameters
2689 * can be modified with the SCTP_INITMSG socket option or
2690 * overridden by the SCTP_INIT CMSG.
2692 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
2693 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
2694 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
2695 sp
->initmsg
.sinit_max_init_timeo
= jiffies_to_msecs(sctp_rto_max
);
2697 /* Initialize default RTO related parameters. These parameters can
2698 * be modified for with the SCTP_RTOINFO socket option.
2700 sp
->rtoinfo
.srto_initial
= jiffies_to_msecs(sctp_rto_initial
);
2701 sp
->rtoinfo
.srto_max
= jiffies_to_msecs(sctp_rto_max
);
2702 sp
->rtoinfo
.srto_min
= jiffies_to_msecs(sctp_rto_min
);
2704 /* Initialize default association related parameters. These parameters
2705 * can be modified with the SCTP_ASSOCINFO socket option.
2707 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
2708 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
2709 sp
->assocparams
.sasoc_peer_rwnd
= 0;
2710 sp
->assocparams
.sasoc_local_rwnd
= 0;
2711 sp
->assocparams
.sasoc_cookie_life
=
2712 jiffies_to_msecs(sctp_valid_cookie_life
);
2714 /* Initialize default event subscriptions. By default, all the
2717 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
2719 /* Default Peer Address Parameters. These defaults can
2720 * be modified via SCTP_PEER_ADDR_PARAMS
2722 sp
->paddrparam
.spp_hbinterval
= jiffies_to_msecs(sctp_hb_interval
);
2723 sp
->paddrparam
.spp_pathmaxrxt
= sctp_max_retrans_path
;
2725 /* If enabled no SCTP message fragmentation will be performed.
2726 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
2728 sp
->disable_fragments
= 0;
2730 /* Turn on/off any Nagle-like algorithm. */
2733 /* Enable by default. */
2736 /* Auto-close idle associations after the configured
2737 * number of seconds. A value of 0 disables this
2738 * feature. Configure through the SCTP_AUTOCLOSE socket option,
2739 * for UDP-style sockets only.
2743 /* User specified fragmentation limit. */
2746 sp
->adaption_ind
= 0;
2748 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
2750 /* Control variables for partial data delivery. */
2752 skb_queue_head_init(&sp
->pd_lobby
);
2754 /* Create a per socket endpoint structure. Even if we
2755 * change the data structure relationships, this may still
2756 * be useful for storing pre-connect address information.
2758 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
2765 SCTP_DBG_OBJCNT_INC(sock
);
2769 /* Cleanup any SCTP per socket resources. */
2770 SCTP_STATIC
int sctp_destroy_sock(struct sock
*sk
)
2772 struct sctp_endpoint
*ep
;
2774 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
2776 /* Release our hold on the endpoint. */
2777 ep
= sctp_sk(sk
)->ep
;
2778 sctp_endpoint_free(ep
);
2783 /* API 4.1.7 shutdown() - TCP Style Syntax
2784 * int shutdown(int socket, int how);
2786 * sd - the socket descriptor of the association to be closed.
2787 * how - Specifies the type of shutdown. The values are
2790 * Disables further receive operations. No SCTP
2791 * protocol action is taken.
2793 * Disables further send operations, and initiates
2794 * the SCTP shutdown sequence.
2796 * Disables further send and receive operations
2797 * and initiates the SCTP shutdown sequence.
2799 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
2801 struct sctp_endpoint
*ep
;
2802 struct sctp_association
*asoc
;
2804 if (!sctp_style(sk
, TCP
))
2807 if (how
& SEND_SHUTDOWN
) {
2808 ep
= sctp_sk(sk
)->ep
;
2809 if (!list_empty(&ep
->asocs
)) {
2810 asoc
= list_entry(ep
->asocs
.next
,
2811 struct sctp_association
, asocs
);
2812 sctp_primitive_SHUTDOWN(asoc
, NULL
);
2817 /* 7.2.1 Association Status (SCTP_STATUS)
2819 * Applications can retrieve current status information about an
2820 * association, including association state, peer receiver window size,
2821 * number of unacked data chunks, and number of data chunks pending
2822 * receipt. This information is read-only.
2824 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
2825 char __user
*optval
,
2828 struct sctp_status status
;
2829 struct sctp_association
*asoc
= NULL
;
2830 struct sctp_transport
*transport
;
2831 sctp_assoc_t associd
;
2834 if (len
!= sizeof(status
)) {
2839 if (copy_from_user(&status
, optval
, sizeof(status
))) {
2844 associd
= status
.sstat_assoc_id
;
2845 asoc
= sctp_id2assoc(sk
, associd
);
2851 transport
= asoc
->peer
.primary_path
;
2853 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
2854 status
.sstat_state
= asoc
->state
;
2855 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
2856 status
.sstat_unackdata
= asoc
->unack_data
;
2858 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
2859 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
2860 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
2861 status
.sstat_fragmentation_point
= asoc
->frag_point
;
2862 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
2863 memcpy(&status
.sstat_primary
.spinfo_address
,
2864 &(transport
->ipaddr
), sizeof(union sctp_addr
));
2865 /* Map ipv4 address into v4-mapped-on-v6 address. */
2866 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
2867 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
2868 status
.sstat_primary
.spinfo_state
= transport
->state
;
2869 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
2870 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
2871 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
2872 status
.sstat_primary
.spinfo_mtu
= transport
->pmtu
;
2874 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
2875 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
2877 if (put_user(len
, optlen
)) {
2882 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
2883 len
, status
.sstat_state
, status
.sstat_rwnd
,
2884 status
.sstat_assoc_id
);
2886 if (copy_to_user(optval
, &status
, len
)) {
2896 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
2898 * Applications can retrieve information about a specific peer address
2899 * of an association, including its reachability state, congestion
2900 * window, and retransmission timer values. This information is
2903 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
2904 char __user
*optval
,
2907 struct sctp_paddrinfo pinfo
;
2908 struct sctp_transport
*transport
;
2911 if (len
!= sizeof(pinfo
)) {
2916 if (copy_from_user(&pinfo
, optval
, sizeof(pinfo
))) {
2921 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
2922 pinfo
.spinfo_assoc_id
);
2926 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
2927 pinfo
.spinfo_state
= transport
->state
;
2928 pinfo
.spinfo_cwnd
= transport
->cwnd
;
2929 pinfo
.spinfo_srtt
= transport
->srtt
;
2930 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
2931 pinfo
.spinfo_mtu
= transport
->pmtu
;
2933 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
2934 pinfo
.spinfo_state
= SCTP_ACTIVE
;
2936 if (put_user(len
, optlen
)) {
2941 if (copy_to_user(optval
, &pinfo
, len
)) {
2950 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2952 * This option is a on/off flag. If enabled no SCTP message
2953 * fragmentation will be performed. Instead if a message being sent
2954 * exceeds the current PMTU size, the message will NOT be sent and
2955 * instead a error will be indicated to the user.
2957 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
2958 char __user
*optval
, int __user
*optlen
)
2962 if (len
< sizeof(int))
2966 val
= (sctp_sk(sk
)->disable_fragments
== 1);
2967 if (put_user(len
, optlen
))
2969 if (copy_to_user(optval
, &val
, len
))
2974 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
2976 * This socket option is used to specify various notifications and
2977 * ancillary data the user wishes to receive.
2979 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
2982 if (len
!= sizeof(struct sctp_event_subscribe
))
2984 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
2989 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2991 * This socket option is applicable to the UDP-style socket only. When
2992 * set it will cause associations that are idle for more than the
2993 * specified number of seconds to automatically close. An association
2994 * being idle is defined an association that has NOT sent or received
2995 * user data. The special value of '0' indicates that no automatic
2996 * close of any associations should be performed. The option expects an
2997 * integer defining the number of seconds of idle time before an
2998 * association is closed.
3000 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3002 /* Applicable to UDP-style socket only */
3003 if (sctp_style(sk
, TCP
))
3005 if (len
!= sizeof(int))
3007 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, len
))
3012 /* Helper routine to branch off an association to a new socket. */
3013 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3014 struct socket
**sockp
)
3016 struct sock
*sk
= asoc
->base
.sk
;
3017 struct socket
*sock
;
3020 /* An association cannot be branched off from an already peeled-off
3021 * socket, nor is this supported for tcp style sockets.
3023 if (!sctp_style(sk
, UDP
))
3026 /* Create a new socket. */
3027 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
3031 /* Populate the fields of the newsk from the oldsk and migrate the
3032 * asoc to the newsk.
3034 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
3040 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3042 sctp_peeloff_arg_t peeloff
;
3043 struct socket
*newsock
;
3045 struct sctp_association
*asoc
;
3047 if (len
!= sizeof(sctp_peeloff_arg_t
))
3049 if (copy_from_user(&peeloff
, optval
, len
))
3052 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
3058 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __FUNCTION__
, sk
, asoc
);
3060 retval
= sctp_do_peeloff(asoc
, &newsock
);
3064 /* Map the socket to an unused fd that can be returned to the user. */
3065 retval
= sock_map_fd(newsock
);
3067 sock_release(newsock
);
3071 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3072 __FUNCTION__
, sk
, asoc
, newsock
->sk
, retval
);
3074 /* Return the fd mapped to the new socket. */
3075 peeloff
.sd
= retval
;
3076 if (copy_to_user(optval
, &peeloff
, len
))
3083 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3085 * Applications can enable or disable heartbeats for any peer address of
3086 * an association, modify an address's heartbeat interval, force a
3087 * heartbeat to be sent immediately, and adjust the address's maximum
3088 * number of retransmissions sent before an address is considered
3089 * unreachable. The following structure is used to access and modify an
3090 * address's parameters:
3092 * struct sctp_paddrparams {
3093 * sctp_assoc_t spp_assoc_id;
3094 * struct sockaddr_storage spp_address;
3095 * uint32_t spp_hbinterval;
3096 * uint16_t spp_pathmaxrxt;
3099 * spp_assoc_id - (UDP style socket) This is filled in the application,
3100 * and identifies the association for this query.
3101 * spp_address - This specifies which address is of interest.
3102 * spp_hbinterval - This contains the value of the heartbeat interval,
3103 * in milliseconds. A value of 0, when modifying the
3104 * parameter, specifies that the heartbeat on this
3105 * address should be disabled. A value of UINT32_MAX
3106 * (4294967295), when modifying the parameter,
3107 * specifies that a heartbeat should be sent
3108 * immediately to the peer address, and the current
3109 * interval should remain unchanged.
3110 * spp_pathmaxrxt - This contains the maximum number of
3111 * retransmissions before this address shall be
3112 * considered unreachable.
3114 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
3115 char __user
*optval
, int __user
*optlen
)
3117 struct sctp_paddrparams params
;
3118 struct sctp_transport
*trans
;
3120 if (len
!= sizeof(struct sctp_paddrparams
))
3122 if (copy_from_user(¶ms
, optval
, len
))
3125 /* If no association id is specified retrieve the default value
3126 * for the endpoint that will be used for all future associations
3128 if (!params
.spp_assoc_id
&&
3129 sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
3130 params
.spp_hbinterval
= sctp_sk(sk
)->paddrparam
.spp_hbinterval
;
3131 params
.spp_pathmaxrxt
= sctp_sk(sk
)->paddrparam
.spp_pathmaxrxt
;
3136 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
3137 params
.spp_assoc_id
);
3141 /* The value of the heartbeat interval, in milliseconds. A value of 0,
3142 * when modifying the parameter, specifies that the heartbeat on this
3143 * address should be disabled.
3145 if (!trans
->hb_allowed
)
3146 params
.spp_hbinterval
= 0;
3148 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hb_interval
);
3150 /* spp_pathmaxrxt contains the maximum number of retransmissions
3151 * before this address shall be considered unreachable.
3153 params
.spp_pathmaxrxt
= trans
->max_retrans
;
3156 if (copy_to_user(optval
, ¶ms
, len
))
3159 if (put_user(len
, optlen
))
3165 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
3167 * Applications can specify protocol parameters for the default association
3168 * initialization. The option name argument to setsockopt() and getsockopt()
3171 * Setting initialization parameters is effective only on an unconnected
3172 * socket (for UDP-style sockets only future associations are effected
3173 * by the change). With TCP-style sockets, this option is inherited by
3174 * sockets derived from a listener socket.
3176 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3178 if (len
!= sizeof(struct sctp_initmsg
))
3180 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
3185 static int sctp_getsockopt_peer_addrs_num_old(struct sock
*sk
, int len
,
3186 char __user
*optval
,
3190 struct sctp_association
*asoc
;
3191 struct list_head
*pos
;
3194 if (len
!= sizeof(sctp_assoc_t
))
3197 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
3200 /* For UDP-style sockets, id specifies the association to query. */
3201 asoc
= sctp_id2assoc(sk
, id
);
3205 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3213 * Old API for getting list of peer addresses. Does not work for 32-bit
3214 * programs running on a 64-bit kernel
3216 static int sctp_getsockopt_peer_addrs_old(struct sock
*sk
, int len
,
3217 char __user
*optval
,
3220 struct sctp_association
*asoc
;
3221 struct list_head
*pos
;
3223 struct sctp_getaddrs_old getaddrs
;
3224 struct sctp_transport
*from
;
3226 union sctp_addr temp
;
3227 struct sctp_sock
*sp
= sctp_sk(sk
);
3230 if (len
!= sizeof(struct sctp_getaddrs_old
))
3233 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs_old
)))
3236 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
3238 /* For UDP-style sockets, id specifies the association to query. */
3239 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3243 to
= (void __user
*)getaddrs
.addrs
;
3244 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3245 from
= list_entry(pos
, struct sctp_transport
, transports
);
3246 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
3247 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3248 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3249 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3250 if (copy_to_user(to
, &temp
, addrlen
))
3254 if (cnt
>= getaddrs
.addr_num
) break;
3256 getaddrs
.addr_num
= cnt
;
3257 if (copy_to_user(optval
, &getaddrs
, sizeof(struct sctp_getaddrs_old
)))
3263 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
3264 char __user
*optval
, int __user
*optlen
)
3266 struct sctp_association
*asoc
;
3267 struct list_head
*pos
;
3269 struct sctp_getaddrs getaddrs
;
3270 struct sctp_transport
*from
;
3272 union sctp_addr temp
;
3273 struct sctp_sock
*sp
= sctp_sk(sk
);
3278 if (len
< sizeof(struct sctp_getaddrs
))
3281 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
3284 /* For UDP-style sockets, id specifies the association to query. */
3285 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3289 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
3290 space_left
= len
- sizeof(struct sctp_getaddrs
) -
3291 offsetof(struct sctp_getaddrs
,addrs
);
3293 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3294 from
= list_entry(pos
, struct sctp_transport
, transports
);
3295 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
3296 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3297 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3298 if(space_left
< addrlen
)
3300 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3301 if (copy_to_user(to
, &temp
, addrlen
))
3305 space_left
-= addrlen
;
3308 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
3310 bytes_copied
= ((char __user
*)to
) - optval
;
3311 if (put_user(bytes_copied
, optlen
))
3317 static int sctp_getsockopt_local_addrs_num_old(struct sock
*sk
, int len
,
3318 char __user
*optval
,
3322 struct sctp_bind_addr
*bp
;
3323 struct sctp_association
*asoc
;
3324 struct list_head
*pos
;
3325 struct sctp_sockaddr_entry
*addr
;
3326 rwlock_t
*addr_lock
;
3327 unsigned long flags
;
3330 if (len
!= sizeof(sctp_assoc_t
))
3333 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
3337 * For UDP-style sockets, id specifies the association to query.
3338 * If the id field is set to the value '0' then the locally bound
3339 * addresses are returned without regard to any particular
3343 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
3344 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
3346 asoc
= sctp_id2assoc(sk
, id
);
3349 bp
= &asoc
->base
.bind_addr
;
3350 addr_lock
= &asoc
->base
.addr_lock
;
3353 sctp_read_lock(addr_lock
);
3355 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
3356 * addresses from the global local address list.
3358 if (sctp_list_single_entry(&bp
->address_list
)) {
3359 addr
= list_entry(bp
->address_list
.next
,
3360 struct sctp_sockaddr_entry
, list
);
3361 if (sctp_is_any(&addr
->a
)) {
3362 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3363 list_for_each(pos
, &sctp_local_addr_list
) {
3364 addr
= list_entry(pos
,
3365 struct sctp_sockaddr_entry
,
3367 if ((PF_INET
== sk
->sk_family
) &&
3368 (AF_INET6
== addr
->a
.sa
.sa_family
))
3372 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3380 list_for_each(pos
, &bp
->address_list
) {
3385 sctp_read_unlock(addr_lock
);
3389 /* Helper function that copies local addresses to user and returns the number
3390 * of addresses copied.
3392 static int sctp_copy_laddrs_to_user_old(struct sock
*sk
, __u16 port
, int max_addrs
,
3395 struct list_head
*pos
;
3396 struct sctp_sockaddr_entry
*addr
;
3397 unsigned long flags
;
3398 union sctp_addr temp
;
3402 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3403 list_for_each(pos
, &sctp_local_addr_list
) {
3404 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3405 if ((PF_INET
== sk
->sk_family
) &&
3406 (AF_INET6
== addr
->a
.sa
.sa_family
))
3408 memcpy(&temp
, &addr
->a
, sizeof(temp
));
3409 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3411 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3412 temp
.v4
.sin_port
= htons(port
);
3413 if (copy_to_user(to
, &temp
, addrlen
)) {
3414 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3420 if (cnt
>= max_addrs
) break;
3422 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
3427 static int sctp_copy_laddrs_to_user(struct sock
*sk
, __u16 port
,
3428 void __user
**to
, size_t space_left
)
3430 struct list_head
*pos
;
3431 struct sctp_sockaddr_entry
*addr
;
3432 unsigned long flags
;
3433 union sctp_addr temp
;
3437 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3438 list_for_each(pos
, &sctp_local_addr_list
) {
3439 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3440 if ((PF_INET
== sk
->sk_family
) &&
3441 (AF_INET6
== addr
->a
.sa
.sa_family
))
3443 memcpy(&temp
, &addr
->a
, sizeof(temp
));
3444 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3446 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3447 if(space_left
<addrlen
)
3449 temp
.v4
.sin_port
= htons(port
);
3450 if (copy_to_user(*to
, &temp
, addrlen
)) {
3451 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3457 space_left
-= addrlen
;
3459 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
3464 /* Old API for getting list of local addresses. Does not work for 32-bit
3465 * programs running on a 64-bit kernel
3467 static int sctp_getsockopt_local_addrs_old(struct sock
*sk
, int len
,
3468 char __user
*optval
, int __user
*optlen
)
3470 struct sctp_bind_addr
*bp
;
3471 struct sctp_association
*asoc
;
3472 struct list_head
*pos
;
3474 struct sctp_getaddrs_old getaddrs
;
3475 struct sctp_sockaddr_entry
*addr
;
3477 union sctp_addr temp
;
3478 struct sctp_sock
*sp
= sctp_sk(sk
);
3480 rwlock_t
*addr_lock
;
3483 if (len
!= sizeof(struct sctp_getaddrs_old
))
3486 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs_old
)))
3489 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
3491 * For UDP-style sockets, id specifies the association to query.
3492 * If the id field is set to the value '0' then the locally bound
3493 * addresses are returned without regard to any particular
3496 if (0 == getaddrs
.assoc_id
) {
3497 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
3498 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
3500 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3503 bp
= &asoc
->base
.bind_addr
;
3504 addr_lock
= &asoc
->base
.addr_lock
;
3507 to
= getaddrs
.addrs
;
3509 sctp_read_lock(addr_lock
);
3511 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
3512 * addresses from the global local address list.
3514 if (sctp_list_single_entry(&bp
->address_list
)) {
3515 addr
= list_entry(bp
->address_list
.next
,
3516 struct sctp_sockaddr_entry
, list
);
3517 if (sctp_is_any(&addr
->a
)) {
3518 cnt
= sctp_copy_laddrs_to_user_old(sk
, bp
->port
,
3529 list_for_each(pos
, &bp
->address_list
) {
3530 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3531 memcpy(&temp
, &addr
->a
, sizeof(temp
));
3532 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3533 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3534 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3535 if (copy_to_user(to
, &temp
, addrlen
)) {
3541 if (cnt
>= getaddrs
.addr_num
) break;
3545 getaddrs
.addr_num
= cnt
;
3546 if (copy_to_user(optval
, &getaddrs
, sizeof(struct sctp_getaddrs_old
)))
3550 sctp_read_unlock(addr_lock
);
3554 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
3555 char __user
*optval
, int __user
*optlen
)
3557 struct sctp_bind_addr
*bp
;
3558 struct sctp_association
*asoc
;
3559 struct list_head
*pos
;
3561 struct sctp_getaddrs getaddrs
;
3562 struct sctp_sockaddr_entry
*addr
;
3564 union sctp_addr temp
;
3565 struct sctp_sock
*sp
= sctp_sk(sk
);
3567 rwlock_t
*addr_lock
;
3572 if (len
<= sizeof(struct sctp_getaddrs
))
3575 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
3579 * For UDP-style sockets, id specifies the association to query.
3580 * If the id field is set to the value '0' then the locally bound
3581 * addresses are returned without regard to any particular
3584 if (0 == getaddrs
.assoc_id
) {
3585 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
3586 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
3588 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3591 bp
= &asoc
->base
.bind_addr
;
3592 addr_lock
= &asoc
->base
.addr_lock
;
3595 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
3596 space_left
= len
- sizeof(struct sctp_getaddrs
) -
3597 offsetof(struct sctp_getaddrs
,addrs
);
3599 sctp_read_lock(addr_lock
);
3601 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
3602 * addresses from the global local address list.
3604 if (sctp_list_single_entry(&bp
->address_list
)) {
3605 addr
= list_entry(bp
->address_list
.next
,
3606 struct sctp_sockaddr_entry
, list
);
3607 if (sctp_is_any(&addr
->a
)) {
3608 cnt
= sctp_copy_laddrs_to_user(sk
, bp
->port
,
3618 list_for_each(pos
, &bp
->address_list
) {
3619 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3620 memcpy(&temp
, &addr
->a
, sizeof(temp
));
3621 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3622 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3623 if(space_left
< addrlen
)
3624 return -ENOMEM
; /*fixme: right error?*/
3625 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3626 if (copy_to_user(to
, &temp
, addrlen
)) {
3632 space_left
-= addrlen
;
3636 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
3638 bytes_copied
= ((char __user
*)to
) - optval
;
3639 if (put_user(bytes_copied
, optlen
))
3643 sctp_read_unlock(addr_lock
);
3647 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3649 * Requests that the local SCTP stack use the enclosed peer address as
3650 * the association primary. The enclosed address must be one of the
3651 * association peer's addresses.
3653 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
3654 char __user
*optval
, int __user
*optlen
)
3656 struct sctp_prim prim
;
3657 struct sctp_association
*asoc
;
3658 struct sctp_sock
*sp
= sctp_sk(sk
);
3660 if (len
!= sizeof(struct sctp_prim
))
3663 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
3666 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
3670 if (!asoc
->peer
.primary_path
)
3673 asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
=
3674 htons(asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
);
3675 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
3676 sizeof(union sctp_addr
));
3677 asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
=
3678 ntohs(asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
);
3680 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
3681 (union sctp_addr
*)&prim
.ssp_addr
);
3683 if (copy_to_user(optval
, &prim
, sizeof(struct sctp_prim
)))
3690 * 7.1.11 Set Adaption Layer Indicator (SCTP_ADAPTION_LAYER)
3692 * Requests that the local endpoint set the specified Adaption Layer
3693 * Indication parameter for all future INIT and INIT-ACK exchanges.
3695 static int sctp_getsockopt_adaption_layer(struct sock
*sk
, int len
,
3696 char __user
*optval
, int __user
*optlen
)
3698 struct sctp_setadaption adaption
;
3700 if (len
!= sizeof(struct sctp_setadaption
))
3703 adaption
.ssb_adaption_ind
= sctp_sk(sk
)->adaption_ind
;
3704 if (copy_to_user(optval
, &adaption
, len
))
3712 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
3714 * Applications that wish to use the sendto() system call may wish to
3715 * specify a default set of parameters that would normally be supplied
3716 * through the inclusion of ancillary data. This socket option allows
3717 * such an application to set the default sctp_sndrcvinfo structure.
3720 * The application that wishes to use this socket option simply passes
3721 * in to this call the sctp_sndrcvinfo structure defined in Section
3722 * 5.2.2) The input parameters accepted by this call include
3723 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
3724 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
3725 * to this call if the caller is using the UDP model.
3727 * For getsockopt, it get the default sctp_sndrcvinfo structure.
3729 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
3730 int len
, char __user
*optval
,
3733 struct sctp_sndrcvinfo info
;
3734 struct sctp_association
*asoc
;
3735 struct sctp_sock
*sp
= sctp_sk(sk
);
3737 if (len
!= sizeof(struct sctp_sndrcvinfo
))
3739 if (copy_from_user(&info
, optval
, sizeof(struct sctp_sndrcvinfo
)))
3742 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
3743 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
3747 info
.sinfo_stream
= asoc
->default_stream
;
3748 info
.sinfo_flags
= asoc
->default_flags
;
3749 info
.sinfo_ppid
= asoc
->default_ppid
;
3750 info
.sinfo_context
= asoc
->default_context
;
3751 info
.sinfo_timetolive
= asoc
->default_timetolive
;
3753 info
.sinfo_stream
= sp
->default_stream
;
3754 info
.sinfo_flags
= sp
->default_flags
;
3755 info
.sinfo_ppid
= sp
->default_ppid
;
3756 info
.sinfo_context
= sp
->default_context
;
3757 info
.sinfo_timetolive
= sp
->default_timetolive
;
3760 if (copy_to_user(optval
, &info
, sizeof(struct sctp_sndrcvinfo
)))
3768 * 7.1.5 SCTP_NODELAY
3770 * Turn on/off any Nagle-like algorithm. This means that packets are
3771 * generally sent as soon as possible and no unnecessary delays are
3772 * introduced, at the cost of more packets in the network. Expects an
3773 * integer boolean flag.
3776 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
3777 char __user
*optval
, int __user
*optlen
)
3781 if (len
< sizeof(int))
3785 val
= (sctp_sk(sk
)->nodelay
== 1);
3786 if (put_user(len
, optlen
))
3788 if (copy_to_user(optval
, &val
, len
))
3795 * 7.1.1 SCTP_RTOINFO
3797 * The protocol parameters used to initialize and bound retransmission
3798 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3799 * and modify these parameters.
3800 * All parameters are time values, in milliseconds. A value of 0, when
3801 * modifying the parameters, indicates that the current value should not
3805 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
3806 char __user
*optval
,
3807 int __user
*optlen
) {
3808 struct sctp_rtoinfo rtoinfo
;
3809 struct sctp_association
*asoc
;
3811 if (len
!= sizeof (struct sctp_rtoinfo
))
3814 if (copy_from_user(&rtoinfo
, optval
, sizeof (struct sctp_rtoinfo
)))
3817 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
3819 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
3822 /* Values corresponding to the specific association. */
3824 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
3825 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
3826 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
3828 /* Values corresponding to the endpoint. */
3829 struct sctp_sock
*sp
= sctp_sk(sk
);
3831 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
3832 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
3833 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
3836 if (put_user(len
, optlen
))
3839 if (copy_to_user(optval
, &rtoinfo
, len
))
3847 * 7.1.2 SCTP_ASSOCINFO
3849 * This option is used to tune the the maximum retransmission attempts
3850 * of the association.
3851 * Returns an error if the new association retransmission value is
3852 * greater than the sum of the retransmission value of the peer.
3853 * See [SCTP] for more information.
3856 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
3857 char __user
*optval
,
3861 struct sctp_assocparams assocparams
;
3862 struct sctp_association
*asoc
;
3863 struct list_head
*pos
;
3866 if (len
!= sizeof (struct sctp_assocparams
))
3869 if (copy_from_user(&assocparams
, optval
,
3870 sizeof (struct sctp_assocparams
)))
3873 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
3875 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
3878 /* Values correspoinding to the specific association */
3880 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
3881 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
3882 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
3883 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
3885 (asoc
->cookie_life
.tv_usec
3888 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3892 assocparams
.sasoc_number_peer_destinations
= cnt
;
3894 /* Values corresponding to the endpoint */
3895 struct sctp_sock
*sp
= sctp_sk(sk
);
3897 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
3898 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
3899 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
3900 assocparams
.sasoc_cookie_life
=
3901 sp
->assocparams
.sasoc_cookie_life
;
3902 assocparams
.sasoc_number_peer_destinations
=
3904 sasoc_number_peer_destinations
;
3907 if (put_user(len
, optlen
))
3910 if (copy_to_user(optval
, &assocparams
, len
))
3917 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3919 * This socket option is a boolean flag which turns on or off mapped V4
3920 * addresses. If this option is turned on and the socket is type
3921 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3922 * If this option is turned off, then no mapping will be done of V4
3923 * addresses and a user will receive both PF_INET6 and PF_INET type
3924 * addresses on the socket.
3926 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
3927 char __user
*optval
, int __user
*optlen
)
3930 struct sctp_sock
*sp
= sctp_sk(sk
);
3932 if (len
< sizeof(int))
3937 if (put_user(len
, optlen
))
3939 if (copy_to_user(optval
, &val
, len
))
3946 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
3948 * This socket option specifies the maximum size to put in any outgoing
3949 * SCTP chunk. If a message is larger than this size it will be
3950 * fragmented by SCTP into the specified size. Note that the underlying
3951 * SCTP implementation may fragment into smaller sized chunks when the
3952 * PMTU of the underlying association is smaller than the value set by
3955 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
3956 char __user
*optval
, int __user
*optlen
)
3960 if (len
< sizeof(int))
3965 val
= sctp_sk(sk
)->user_frag
;
3966 if (put_user(len
, optlen
))
3968 if (copy_to_user(optval
, &val
, len
))
3974 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
3975 char __user
*optval
, int __user
*optlen
)
3980 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
3983 /* I can hardly begin to describe how wrong this is. This is
3984 * so broken as to be worse than useless. The API draft
3985 * REALLY is NOT helpful here... I am not convinced that the
3986 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
3987 * are at all well-founded.
3989 if (level
!= SOL_SCTP
) {
3990 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3992 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
3996 if (get_user(len
, optlen
))
4003 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
4005 case SCTP_DISABLE_FRAGMENTS
:
4006 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
4010 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
4012 case SCTP_AUTOCLOSE
:
4013 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
4015 case SCTP_SOCKOPT_PEELOFF
:
4016 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
4018 case SCTP_PEER_ADDR_PARAMS
:
4019 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
4023 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
4025 case SCTP_GET_PEER_ADDRS_NUM_OLD
:
4026 retval
= sctp_getsockopt_peer_addrs_num_old(sk
, len
, optval
,
4029 case SCTP_GET_LOCAL_ADDRS_NUM_OLD
:
4030 retval
= sctp_getsockopt_local_addrs_num_old(sk
, len
, optval
,
4033 case SCTP_GET_PEER_ADDRS_OLD
:
4034 retval
= sctp_getsockopt_peer_addrs_old(sk
, len
, optval
,
4037 case SCTP_GET_LOCAL_ADDRS_OLD
:
4038 retval
= sctp_getsockopt_local_addrs_old(sk
, len
, optval
,
4041 case SCTP_GET_PEER_ADDRS
:
4042 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
4045 case SCTP_GET_LOCAL_ADDRS
:
4046 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
4049 case SCTP_DEFAULT_SEND_PARAM
:
4050 retval
= sctp_getsockopt_default_send_param(sk
, len
,
4053 case SCTP_PRIMARY_ADDR
:
4054 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
4057 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
4060 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
4062 case SCTP_ASSOCINFO
:
4063 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
4065 case SCTP_I_WANT_MAPPED_V4_ADDR
:
4066 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
4069 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
4071 case SCTP_GET_PEER_ADDR_INFO
:
4072 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
4075 case SCTP_ADAPTION_LAYER
:
4076 retval
= sctp_getsockopt_adaption_layer(sk
, len
, optval
,
4080 retval
= -ENOPROTOOPT
;
4084 sctp_release_sock(sk
);
4088 static void sctp_hash(struct sock
*sk
)
4093 static void sctp_unhash(struct sock
*sk
)
4098 /* Check if port is acceptable. Possibly find first available port.
4100 * The port hash table (contained in the 'global' SCTP protocol storage
4101 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
4102 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
4103 * list (the list number is the port number hashed out, so as you
4104 * would expect from a hash function, all the ports in a given list have
4105 * such a number that hashes out to the same list number; you were
4106 * expecting that, right?); so each list has a set of ports, with a
4107 * link to the socket (struct sock) that uses it, the port number and
4108 * a fastreuse flag (FIXME: NPI ipg).
4110 static struct sctp_bind_bucket
*sctp_bucket_create(
4111 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
4113 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
4115 struct sctp_bind_hashbucket
*head
; /* hash list */
4116 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
4117 unsigned short snum
;
4120 /* NOTE: Remember to put this back to net order. */
4121 addr
->v4
.sin_port
= ntohs(addr
->v4
.sin_port
);
4122 snum
= addr
->v4
.sin_port
;
4124 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
4125 sctp_local_bh_disable();
4128 /* Search for an available port.
4130 * 'sctp_port_rover' was the last port assigned, so
4131 * we start to search from 'sctp_port_rover +
4132 * 1'. What we do is first check if port 'rover' is
4133 * already in the hash table; if not, we use that; if
4134 * it is, we try next.
4136 int low
= sysctl_local_port_range
[0];
4137 int high
= sysctl_local_port_range
[1];
4138 int remaining
= (high
- low
) + 1;
4142 sctp_spin_lock(&sctp_port_alloc_lock
);
4143 rover
= sctp_port_rover
;
4146 if ((rover
< low
) || (rover
> high
))
4148 index
= sctp_phashfn(rover
);
4149 head
= &sctp_port_hashtable
[index
];
4150 sctp_spin_lock(&head
->lock
);
4151 for (pp
= head
->chain
; pp
; pp
= pp
->next
)
4152 if (pp
->port
== rover
)
4156 sctp_spin_unlock(&head
->lock
);
4157 } while (--remaining
> 0);
4158 sctp_port_rover
= rover
;
4159 sctp_spin_unlock(&sctp_port_alloc_lock
);
4161 /* Exhausted local port range during search? */
4166 /* OK, here is the one we will use. HEAD (the port
4167 * hash table list entry) is non-NULL and we hold it's
4172 /* We are given an specific port number; we verify
4173 * that it is not being used. If it is used, we will
4174 * exahust the search in the hash list corresponding
4175 * to the port number (snum) - we detect that with the
4176 * port iterator, pp being NULL.
4178 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
4179 sctp_spin_lock(&head
->lock
);
4180 for (pp
= head
->chain
; pp
; pp
= pp
->next
) {
4181 if (pp
->port
== snum
)
4188 if (!hlist_empty(&pp
->owner
)) {
4189 /* We had a port hash table hit - there is an
4190 * available port (pp != NULL) and it is being
4191 * used by other socket (pp->owner not empty); that other
4192 * socket is going to be sk2.
4194 int reuse
= sk
->sk_reuse
;
4196 struct hlist_node
*node
;
4198 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
4199 if (pp
->fastreuse
&& sk
->sk_reuse
)
4202 /* Run through the list of sockets bound to the port
4203 * (pp->port) [via the pointers bind_next and
4204 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
4205 * we get the endpoint they describe and run through
4206 * the endpoint's list of IP (v4 or v6) addresses,
4207 * comparing each of the addresses with the address of
4208 * the socket sk. If we find a match, then that means
4209 * that this port/socket (sk) combination are already
4212 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
4213 struct sctp_endpoint
*ep2
;
4214 ep2
= sctp_sk(sk2
)->ep
;
4216 if (reuse
&& sk2
->sk_reuse
)
4219 if (sctp_bind_addr_match(&ep2
->base
.bind_addr
, addr
,
4225 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
4228 /* If there was a hash table miss, create a new port. */
4230 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
4233 /* In either case (hit or miss), make sure fastreuse is 1 only
4234 * if sk->sk_reuse is too (that is, if the caller requested
4235 * SO_REUSEADDR on this socket -sk-).
4237 if (hlist_empty(&pp
->owner
))
4238 pp
->fastreuse
= sk
->sk_reuse
? 1 : 0;
4239 else if (pp
->fastreuse
&& !sk
->sk_reuse
)
4242 /* We are set, so fill up all the data in the hash table
4243 * entry, tie the socket list information with the rest of the
4244 * sockets FIXME: Blurry, NPI (ipg).
4247 inet_sk(sk
)->num
= snum
;
4248 if (!sctp_sk(sk
)->bind_hash
) {
4249 sk_add_bind_node(sk
, &pp
->owner
);
4250 sctp_sk(sk
)->bind_hash
= pp
;
4255 sctp_spin_unlock(&head
->lock
);
4258 sctp_local_bh_enable();
4259 addr
->v4
.sin_port
= htons(addr
->v4
.sin_port
);
4263 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
4264 * port is requested.
4266 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
4269 union sctp_addr addr
;
4270 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
4272 /* Set up a dummy address struct from the sk. */
4273 af
->from_sk(&addr
, sk
);
4274 addr
.v4
.sin_port
= htons(snum
);
4276 /* Note: sk->sk_num gets filled in if ephemeral port request. */
4277 ret
= sctp_get_port_local(sk
, &addr
);
4279 return (ret
? 1 : 0);
4283 * 3.1.3 listen() - UDP Style Syntax
4285 * By default, new associations are not accepted for UDP style sockets.
4286 * An application uses listen() to mark a socket as being able to
4287 * accept new associations.
4289 SCTP_STATIC
int sctp_seqpacket_listen(struct sock
*sk
, int backlog
)
4291 struct sctp_sock
*sp
= sctp_sk(sk
);
4292 struct sctp_endpoint
*ep
= sp
->ep
;
4294 /* Only UDP style sockets that are not peeled off are allowed to
4297 if (!sctp_style(sk
, UDP
))
4300 /* If backlog is zero, disable listening. */
4302 if (sctp_sstate(sk
, CLOSED
))
4305 sctp_unhash_endpoint(ep
);
4306 sk
->sk_state
= SCTP_SS_CLOSED
;
4309 /* Return if we are already listening. */
4310 if (sctp_sstate(sk
, LISTENING
))
4314 * If a bind() or sctp_bindx() is not called prior to a listen()
4315 * call that allows new associations to be accepted, the system
4316 * picks an ephemeral port and will choose an address set equivalent
4317 * to binding with a wildcard address.
4319 * This is not currently spelled out in the SCTP sockets
4320 * extensions draft, but follows the practice as seen in TCP
4323 if (!ep
->base
.bind_addr
.port
) {
4324 if (sctp_autobind(sk
))
4327 sk
->sk_state
= SCTP_SS_LISTENING
;
4328 sctp_hash_endpoint(ep
);
4333 * 4.1.3 listen() - TCP Style Syntax
4335 * Applications uses listen() to ready the SCTP endpoint for accepting
4336 * inbound associations.
4338 SCTP_STATIC
int sctp_stream_listen(struct sock
*sk
, int backlog
)
4340 struct sctp_sock
*sp
= sctp_sk(sk
);
4341 struct sctp_endpoint
*ep
= sp
->ep
;
4343 /* If backlog is zero, disable listening. */
4345 if (sctp_sstate(sk
, CLOSED
))
4348 sctp_unhash_endpoint(ep
);
4349 sk
->sk_state
= SCTP_SS_CLOSED
;
4352 if (sctp_sstate(sk
, LISTENING
))
4356 * If a bind() or sctp_bindx() is not called prior to a listen()
4357 * call that allows new associations to be accepted, the system
4358 * picks an ephemeral port and will choose an address set equivalent
4359 * to binding with a wildcard address.
4361 * This is not currently spelled out in the SCTP sockets
4362 * extensions draft, but follows the practice as seen in TCP
4365 if (!ep
->base
.bind_addr
.port
) {
4366 if (sctp_autobind(sk
))
4369 sk
->sk_state
= SCTP_SS_LISTENING
;
4370 sk
->sk_max_ack_backlog
= backlog
;
4371 sctp_hash_endpoint(ep
);
4376 * Move a socket to LISTENING state.
4378 int sctp_inet_listen(struct socket
*sock
, int backlog
)
4380 struct sock
*sk
= sock
->sk
;
4381 struct crypto_tfm
*tfm
=NULL
;
4384 if (unlikely(backlog
< 0))
4389 if (sock
->state
!= SS_UNCONNECTED
)
4392 /* Allocate HMAC for generating cookie. */
4393 if (sctp_hmac_alg
) {
4394 tfm
= sctp_crypto_alloc_tfm(sctp_hmac_alg
, 0);
4401 switch (sock
->type
) {
4402 case SOCK_SEQPACKET
:
4403 err
= sctp_seqpacket_listen(sk
, backlog
);
4406 err
= sctp_stream_listen(sk
, backlog
);
4414 /* Store away the transform reference. */
4415 sctp_sk(sk
)->hmac
= tfm
;
4417 sctp_release_sock(sk
);
4420 sctp_crypto_free_tfm(tfm
);
4425 * This function is done by modeling the current datagram_poll() and the
4426 * tcp_poll(). Note that, based on these implementations, we don't
4427 * lock the socket in this function, even though it seems that,
4428 * ideally, locking or some other mechanisms can be used to ensure
4429 * the integrity of the counters (sndbuf and wmem_queued) used
4430 * in this place. We assume that we don't need locks either until proven
4433 * Another thing to note is that we include the Async I/O support
4434 * here, again, by modeling the current TCP/UDP code. We don't have
4435 * a good way to test with it yet.
4437 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
4439 struct sock
*sk
= sock
->sk
;
4440 struct sctp_sock
*sp
= sctp_sk(sk
);
4443 poll_wait(file
, sk
->sk_sleep
, wait
);
4445 /* A TCP-style listening socket becomes readable when the accept queue
4448 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
4449 return (!list_empty(&sp
->ep
->asocs
)) ?
4450 (POLLIN
| POLLRDNORM
) : 0;
4454 /* Is there any exceptional events? */
4455 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
4457 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
4460 /* Is it readable? Reconsider this code with TCP-style support. */
4461 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
4462 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
4463 mask
|= POLLIN
| POLLRDNORM
;
4465 /* The association is either gone or not ready. */
4466 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
4469 /* Is it writable? */
4470 if (sctp_writeable(sk
)) {
4471 mask
|= POLLOUT
| POLLWRNORM
;
4473 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
4475 * Since the socket is not locked, the buffer
4476 * might be made available after the writeable check and
4477 * before the bit is set. This could cause a lost I/O
4478 * signal. tcp_poll() has a race breaker for this race
4479 * condition. Based on their implementation, we put
4480 * in the following code to cover it as well.
4482 if (sctp_writeable(sk
))
4483 mask
|= POLLOUT
| POLLWRNORM
;
4488 /********************************************************************
4489 * 2nd Level Abstractions
4490 ********************************************************************/
4492 static struct sctp_bind_bucket
*sctp_bucket_create(
4493 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
4495 struct sctp_bind_bucket
*pp
;
4497 pp
= kmem_cache_alloc(sctp_bucket_cachep
, SLAB_ATOMIC
);
4498 SCTP_DBG_OBJCNT_INC(bind_bucket
);
4502 INIT_HLIST_HEAD(&pp
->owner
);
4503 if ((pp
->next
= head
->chain
) != NULL
)
4504 pp
->next
->pprev
= &pp
->next
;
4506 pp
->pprev
= &head
->chain
;
4511 /* Caller must hold hashbucket lock for this tb with local BH disabled */
4512 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
4514 if (hlist_empty(&pp
->owner
)) {
4516 pp
->next
->pprev
= pp
->pprev
;
4517 *(pp
->pprev
) = pp
->next
;
4518 kmem_cache_free(sctp_bucket_cachep
, pp
);
4519 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
4523 /* Release this socket's reference to a local port. */
4524 static inline void __sctp_put_port(struct sock
*sk
)
4526 struct sctp_bind_hashbucket
*head
=
4527 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->num
)];
4528 struct sctp_bind_bucket
*pp
;
4530 sctp_spin_lock(&head
->lock
);
4531 pp
= sctp_sk(sk
)->bind_hash
;
4532 __sk_del_bind_node(sk
);
4533 sctp_sk(sk
)->bind_hash
= NULL
;
4534 inet_sk(sk
)->num
= 0;
4535 sctp_bucket_destroy(pp
);
4536 sctp_spin_unlock(&head
->lock
);
4539 void sctp_put_port(struct sock
*sk
)
4541 sctp_local_bh_disable();
4542 __sctp_put_port(sk
);
4543 sctp_local_bh_enable();
4547 * The system picks an ephemeral port and choose an address set equivalent
4548 * to binding with a wildcard address.
4549 * One of those addresses will be the primary address for the association.
4550 * This automatically enables the multihoming capability of SCTP.
4552 static int sctp_autobind(struct sock
*sk
)
4554 union sctp_addr autoaddr
;
4556 unsigned short port
;
4558 /* Initialize a local sockaddr structure to INADDR_ANY. */
4559 af
= sctp_sk(sk
)->pf
->af
;
4561 port
= htons(inet_sk(sk
)->num
);
4562 af
->inaddr_any(&autoaddr
, port
);
4564 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
4567 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
4570 * 4.2 The cmsghdr Structure *
4572 * When ancillary data is sent or received, any number of ancillary data
4573 * objects can be specified by the msg_control and msg_controllen members of
4574 * the msghdr structure, because each object is preceded by
4575 * a cmsghdr structure defining the object's length (the cmsg_len member).
4576 * Historically Berkeley-derived implementations have passed only one object
4577 * at a time, but this API allows multiple objects to be
4578 * passed in a single call to sendmsg() or recvmsg(). The following example
4579 * shows two ancillary data objects in a control buffer.
4581 * |<--------------------------- msg_controllen -------------------------->|
4584 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
4586 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
4589 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
4591 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
4594 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
4595 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
4597 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
4599 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
4606 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
4607 sctp_cmsgs_t
*cmsgs
)
4609 struct cmsghdr
*cmsg
;
4611 for (cmsg
= CMSG_FIRSTHDR(msg
);
4613 cmsg
= CMSG_NXTHDR((struct msghdr
*)msg
, cmsg
)) {
4614 if (!CMSG_OK(msg
, cmsg
))
4617 /* Should we parse this header or ignore? */
4618 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
4621 /* Strictly check lengths following example in SCM code. */
4622 switch (cmsg
->cmsg_type
) {
4624 /* SCTP Socket API Extension
4625 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
4627 * This cmsghdr structure provides information for
4628 * initializing new SCTP associations with sendmsg().
4629 * The SCTP_INITMSG socket option uses this same data
4630 * structure. This structure is not used for
4633 * cmsg_level cmsg_type cmsg_data[]
4634 * ------------ ------------ ----------------------
4635 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
4637 if (cmsg
->cmsg_len
!=
4638 CMSG_LEN(sizeof(struct sctp_initmsg
)))
4640 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
4644 /* SCTP Socket API Extension
4645 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
4647 * This cmsghdr structure specifies SCTP options for
4648 * sendmsg() and describes SCTP header information
4649 * about a received message through recvmsg().
4651 * cmsg_level cmsg_type cmsg_data[]
4652 * ------------ ------------ ----------------------
4653 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
4655 if (cmsg
->cmsg_len
!=
4656 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
4660 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
4662 /* Minimally, validate the sinfo_flags. */
4663 if (cmsgs
->info
->sinfo_flags
&
4664 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
4665 SCTP_ABORT
| SCTP_EOF
))
4677 * Wait for a packet..
4678 * Note: This function is the same function as in core/datagram.c
4679 * with a few modifications to make lksctp work.
4681 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
4686 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
4688 /* Socket errors? */
4689 error
= sock_error(sk
);
4693 if (!skb_queue_empty(&sk
->sk_receive_queue
))
4696 /* Socket shut down? */
4697 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
4700 /* Sequenced packets can come disconnected. If so we report the
4705 /* Is there a good reason to think that we may receive some data? */
4706 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
4709 /* Handle signals. */
4710 if (signal_pending(current
))
4713 /* Let another process have a go. Since we are going to sleep
4714 * anyway. Note: This may cause odd behaviors if the message
4715 * does not fit in the user's buffer, but this seems to be the
4716 * only way to honor MSG_DONTWAIT realistically.
4718 sctp_release_sock(sk
);
4719 *timeo_p
= schedule_timeout(*timeo_p
);
4723 finish_wait(sk
->sk_sleep
, &wait
);
4727 error
= sock_intr_errno(*timeo_p
);
4730 finish_wait(sk
->sk_sleep
, &wait
);
4735 /* Receive a datagram.
4736 * Note: This is pretty much the same routine as in core/datagram.c
4737 * with a few changes to make lksctp work.
4739 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
4740 int noblock
, int *err
)
4743 struct sk_buff
*skb
;
4746 timeo
= sock_rcvtimeo(sk
, noblock
);
4748 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
4749 timeo
, MAX_SCHEDULE_TIMEOUT
);
4752 /* Again only user level code calls this function,
4753 * so nothing interrupt level
4754 * will suddenly eat the receive_queue.
4756 * Look at current nfs client by the way...
4757 * However, this function was corrent in any case. 8)
4759 if (flags
& MSG_PEEK
) {
4760 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
4761 skb
= skb_peek(&sk
->sk_receive_queue
);
4763 atomic_inc(&skb
->users
);
4764 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
4766 skb
= skb_dequeue(&sk
->sk_receive_queue
);
4772 /* Caller is allowed not to check sk->sk_err before calling. */
4773 error
= sock_error(sk
);
4777 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
4780 /* User doesn't want to wait. */
4784 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
4793 /* If sndbuf has changed, wake up per association sndbuf waiters. */
4794 static void __sctp_write_space(struct sctp_association
*asoc
)
4796 struct sock
*sk
= asoc
->base
.sk
;
4797 struct socket
*sock
= sk
->sk_socket
;
4799 if ((sctp_wspace(asoc
) > 0) && sock
) {
4800 if (waitqueue_active(&asoc
->wait
))
4801 wake_up_interruptible(&asoc
->wait
);
4803 if (sctp_writeable(sk
)) {
4804 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
4805 wake_up_interruptible(sk
->sk_sleep
);
4807 /* Note that we try to include the Async I/O support
4808 * here by modeling from the current TCP/UDP code.
4809 * We have not tested with it yet.
4811 if (sock
->fasync_list
&&
4812 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
4813 sock_wake_async(sock
, 2, POLL_OUT
);
4818 /* Do accounting for the sndbuf space.
4819 * Decrement the used sndbuf space of the corresponding association by the
4820 * data size which was just transmitted(freed).
4822 static void sctp_wfree(struct sk_buff
*skb
)
4824 struct sctp_association
*asoc
;
4825 struct sctp_chunk
*chunk
;
4828 /* Get the saved chunk pointer. */
4829 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
4832 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
4833 sizeof(struct sk_buff
) +
4834 sizeof(struct sctp_chunk
);
4836 sk
->sk_wmem_queued
-= SCTP_DATA_SNDSIZE(chunk
) +
4837 sizeof(struct sk_buff
) +
4838 sizeof(struct sctp_chunk
);
4840 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
4843 __sctp_write_space(asoc
);
4845 sctp_association_put(asoc
);
4848 /* Helper function to wait for space in the sndbuf. */
4849 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
4852 struct sock
*sk
= asoc
->base
.sk
;
4854 long current_timeo
= *timeo_p
;
4857 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
4858 asoc
, (long)(*timeo_p
), msg_len
);
4860 /* Increment the association's refcnt. */
4861 sctp_association_hold(asoc
);
4863 /* Wait on the association specific sndbuf space. */
4865 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
4866 TASK_INTERRUPTIBLE
);
4869 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
4872 if (signal_pending(current
))
4873 goto do_interrupted
;
4874 if (msg_len
<= sctp_wspace(asoc
))
4877 /* Let another process have a go. Since we are going
4880 sctp_release_sock(sk
);
4881 current_timeo
= schedule_timeout(current_timeo
);
4884 *timeo_p
= current_timeo
;
4888 finish_wait(&asoc
->wait
, &wait
);
4890 /* Release the association's refcnt. */
4891 sctp_association_put(asoc
);
4900 err
= sock_intr_errno(*timeo_p
);
4908 /* If socket sndbuf has changed, wake up all per association waiters. */
4909 void sctp_write_space(struct sock
*sk
)
4911 struct sctp_association
*asoc
;
4912 struct list_head
*pos
;
4914 /* Wake up the tasks in each wait queue. */
4915 list_for_each(pos
, &((sctp_sk(sk
))->ep
->asocs
)) {
4916 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
4917 __sctp_write_space(asoc
);
4921 /* Is there any sndbuf space available on the socket?
4923 * Note that wmem_queued is the sum of the send buffers on all of the
4924 * associations on the same socket. For a UDP-style socket with
4925 * multiple associations, it is possible for it to be "unwriteable"
4926 * prematurely. I assume that this is acceptable because
4927 * a premature "unwriteable" is better than an accidental "writeable" which
4928 * would cause an unwanted block under certain circumstances. For the 1-1
4929 * UDP-style sockets or TCP-style sockets, this code should work.
4932 static int sctp_writeable(struct sock
*sk
)
4936 amt
= sk
->sk_sndbuf
- sk
->sk_wmem_queued
;
4942 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
4943 * returns immediately with EINPROGRESS.
4945 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
4947 struct sock
*sk
= asoc
->base
.sk
;
4949 long current_timeo
= *timeo_p
;
4952 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __FUNCTION__
, asoc
,
4955 /* Increment the association's refcnt. */
4956 sctp_association_hold(asoc
);
4959 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
4960 TASK_INTERRUPTIBLE
);
4963 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
4965 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
4968 if (signal_pending(current
))
4969 goto do_interrupted
;
4971 if (sctp_state(asoc
, ESTABLISHED
))
4974 /* Let another process have a go. Since we are going
4977 sctp_release_sock(sk
);
4978 current_timeo
= schedule_timeout(current_timeo
);
4981 *timeo_p
= current_timeo
;
4985 finish_wait(&asoc
->wait
, &wait
);
4987 /* Release the association's refcnt. */
4988 sctp_association_put(asoc
);
4993 if (asoc
->init_err_counter
+ 1 >= asoc
->max_init_attempts
)
4996 err
= -ECONNREFUSED
;
5000 err
= sock_intr_errno(*timeo_p
);
5008 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
5010 struct sctp_endpoint
*ep
;
5014 ep
= sctp_sk(sk
)->ep
;
5018 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
,
5019 TASK_INTERRUPTIBLE
);
5021 if (list_empty(&ep
->asocs
)) {
5022 sctp_release_sock(sk
);
5023 timeo
= schedule_timeout(timeo
);
5028 if (!sctp_sstate(sk
, LISTENING
))
5032 if (!list_empty(&ep
->asocs
))
5035 err
= sock_intr_errno(timeo
);
5036 if (signal_pending(current
))
5044 finish_wait(sk
->sk_sleep
, &wait
);
5049 void sctp_wait_for_close(struct sock
*sk
, long timeout
)
5054 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5055 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
5057 sctp_release_sock(sk
);
5058 timeout
= schedule_timeout(timeout
);
5060 } while (!signal_pending(current
) && timeout
);
5062 finish_wait(sk
->sk_sleep
, &wait
);
5065 /* Populate the fields of the newsk from the oldsk and migrate the assoc
5066 * and its messages to the newsk.
5068 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
5069 struct sctp_association
*assoc
,
5070 sctp_socket_type_t type
)
5072 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
5073 struct sctp_sock
*newsp
= sctp_sk(newsk
);
5074 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5075 struct sctp_endpoint
*newep
= newsp
->ep
;
5076 struct sk_buff
*skb
, *tmp
;
5077 struct sctp_ulpevent
*event
;
5080 /* Migrate socket buffer sizes and all the socket level options to the
5083 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
5084 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
5085 /* Brute force copy old sctp opt. */
5086 inet_sk_copy_descendant(newsk
, oldsk
);
5088 /* Restore the ep value that was overwritten with the above structure
5094 /* Hook this new socket in to the bind_hash list. */
5095 pp
= sctp_sk(oldsk
)->bind_hash
;
5096 sk_add_bind_node(newsk
, &pp
->owner
);
5097 sctp_sk(newsk
)->bind_hash
= pp
;
5098 inet_sk(newsk
)->num
= inet_sk(oldsk
)->num
;
5100 /* Copy the bind_addr list from the original endpoint to the new
5101 * endpoint so that we can handle restarts properly
5103 if (assoc
->peer
.ipv4_address
)
5104 flags
|= SCTP_ADDR4_PEERSUPP
;
5105 if (assoc
->peer
.ipv6_address
)
5106 flags
|= SCTP_ADDR6_PEERSUPP
;
5107 sctp_bind_addr_copy(&newsp
->ep
->base
.bind_addr
,
5108 &oldsp
->ep
->base
.bind_addr
,
5109 SCTP_SCOPE_GLOBAL
, GFP_KERNEL
, flags
);
5111 /* Move any messages in the old socket's receive queue that are for the
5112 * peeled off association to the new socket's receive queue.
5114 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
5115 event
= sctp_skb2event(skb
);
5116 if (event
->asoc
== assoc
) {
5118 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
5119 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
5120 skb_set_owner_r(skb
, newsk
);
5124 /* Clean up any messages pending delivery due to partial
5125 * delivery. Three cases:
5126 * 1) No partial deliver; no work.
5127 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
5128 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
5130 skb_queue_head_init(&newsp
->pd_lobby
);
5131 sctp_sk(newsk
)->pd_mode
= assoc
->ulpq
.pd_mode
;
5133 if (sctp_sk(oldsk
)->pd_mode
) {
5134 struct sk_buff_head
*queue
;
5136 /* Decide which queue to move pd_lobby skbs to. */
5137 if (assoc
->ulpq
.pd_mode
) {
5138 queue
= &newsp
->pd_lobby
;
5140 queue
= &newsk
->sk_receive_queue
;
5142 /* Walk through the pd_lobby, looking for skbs that
5143 * need moved to the new socket.
5145 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
5146 event
= sctp_skb2event(skb
);
5147 if (event
->asoc
== assoc
) {
5149 __skb_unlink(skb
, &oldsp
->pd_lobby
);
5150 __skb_queue_tail(queue
, skb
);
5151 skb_set_owner_r(skb
, newsk
);
5155 /* Clear up any skbs waiting for the partial
5156 * delivery to finish.
5158 if (assoc
->ulpq
.pd_mode
)
5159 sctp_clear_pd(oldsk
);
5163 /* Set the type of socket to indicate that it is peeled off from the
5164 * original UDP-style socket or created with the accept() call on a
5165 * TCP-style socket..
5169 /* Migrate the association to the new socket. */
5170 sctp_assoc_migrate(assoc
, newsk
);
5172 /* If the association on the newsk is already closed before accept()
5173 * is called, set RCV_SHUTDOWN flag.
5175 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
5176 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
5178 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
5181 /* This proto struct describes the ULP interface for SCTP. */
5182 struct proto sctp_prot
= {
5184 .owner
= THIS_MODULE
,
5185 .close
= sctp_close
,
5186 .connect
= sctp_connect
,
5187 .disconnect
= sctp_disconnect
,
5188 .accept
= sctp_accept
,
5189 .ioctl
= sctp_ioctl
,
5190 .init
= sctp_init_sock
,
5191 .destroy
= sctp_destroy_sock
,
5192 .shutdown
= sctp_shutdown
,
5193 .setsockopt
= sctp_setsockopt
,
5194 .getsockopt
= sctp_getsockopt
,
5195 .sendmsg
= sctp_sendmsg
,
5196 .recvmsg
= sctp_recvmsg
,
5198 .backlog_rcv
= sctp_backlog_rcv
,
5200 .unhash
= sctp_unhash
,
5201 .get_port
= sctp_get_port
,
5202 .obj_size
= sizeof(struct sctp_sock
),
5205 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5206 struct proto sctpv6_prot
= {
5208 .owner
= THIS_MODULE
,
5209 .close
= sctp_close
,
5210 .connect
= sctp_connect
,
5211 .disconnect
= sctp_disconnect
,
5212 .accept
= sctp_accept
,
5213 .ioctl
= sctp_ioctl
,
5214 .init
= sctp_init_sock
,
5215 .destroy
= sctp_destroy_sock
,
5216 .shutdown
= sctp_shutdown
,
5217 .setsockopt
= sctp_setsockopt
,
5218 .getsockopt
= sctp_getsockopt
,
5219 .sendmsg
= sctp_sendmsg
,
5220 .recvmsg
= sctp_recvmsg
,
5222 .backlog_rcv
= sctp_backlog_rcv
,
5224 .unhash
= sctp_unhash
,
5225 .get_port
= sctp_get_port
,
5226 .obj_size
= sizeof(struct sctp6_sock
),
5228 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */