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/capability.h>
67 #include <linux/fcntl.h>
68 #include <linux/poll.h>
69 #include <linux/init.h>
70 #include <linux/crypto.h>
74 #include <net/route.h>
76 #include <net/inet_common.h>
78 #include <linux/socket.h> /* for sa_family_t */
80 #include <net/sctp/sctp.h>
81 #include <net/sctp/sm.h>
83 /* WARNING: Please do not remove the SCTP_STATIC attribute to
84 * any of the functions below as they are used to export functions
85 * used by a project regression testsuite.
88 /* Forward declarations for internal helper functions. */
89 static int sctp_writeable(struct sock
*sk
);
90 static void sctp_wfree(struct sk_buff
*skb
);
91 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
93 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
);
94 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
95 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
96 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
97 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
98 union sctp_addr
*addr
, int len
);
99 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
100 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
101 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
102 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
103 static int sctp_send_asconf(struct sctp_association
*asoc
,
104 struct sctp_chunk
*chunk
);
105 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
106 static int sctp_autobind(struct sock
*sk
);
107 static void sctp_sock_migrate(struct sock
*, struct sock
*,
108 struct sctp_association
*, sctp_socket_type_t
);
109 static char *sctp_hmac_alg
= SCTP_COOKIE_HMAC_ALG
;
111 extern kmem_cache_t
*sctp_bucket_cachep
;
113 /* Get the sndbuf space available at the time on the association. */
114 static inline int sctp_wspace(struct sctp_association
*asoc
)
116 struct sock
*sk
= asoc
->base
.sk
;
119 if (asoc
->ep
->sndbuf_policy
) {
120 /* make sure that no association uses more than sk_sndbuf */
121 amt
= sk
->sk_sndbuf
- asoc
->sndbuf_used
;
123 /* do socket level accounting */
124 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
133 /* Increment the used sndbuf space count of the corresponding association by
134 * the size of the outgoing data chunk.
135 * Also, set the skb destructor for sndbuf accounting later.
137 * Since it is always 1-1 between chunk and skb, and also a new skb is always
138 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
139 * destructor in the data chunk skb for the purpose of the sndbuf space
142 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
144 struct sctp_association
*asoc
= chunk
->asoc
;
145 struct sock
*sk
= asoc
->base
.sk
;
147 /* The sndbuf space is tracked per association. */
148 sctp_association_hold(asoc
);
150 skb_set_owner_w(chunk
->skb
, sk
);
152 chunk
->skb
->destructor
= sctp_wfree
;
153 /* Save the chunk pointer in skb for sctp_wfree to use later. */
154 *((struct sctp_chunk
**)(chunk
->skb
->cb
)) = chunk
;
156 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
157 sizeof(struct sk_buff
) +
158 sizeof(struct sctp_chunk
);
160 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
163 /* Verify that this is a valid address. */
164 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
169 /* Verify basic sockaddr. */
170 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
174 /* Is this a valid SCTP address? */
175 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
178 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
184 /* Look up the association by its id. If this is not a UDP-style
185 * socket, the ID field is always ignored.
187 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
189 struct sctp_association
*asoc
= NULL
;
191 /* If this is not a UDP-style socket, assoc id should be ignored. */
192 if (!sctp_style(sk
, UDP
)) {
193 /* Return NULL if the socket state is not ESTABLISHED. It
194 * could be a TCP-style listening socket or a socket which
195 * hasn't yet called connect() to establish an association.
197 if (!sctp_sstate(sk
, ESTABLISHED
))
200 /* Get the first and the only association from the list. */
201 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
202 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
203 struct sctp_association
, asocs
);
207 /* Otherwise this is a UDP-style socket. */
208 if (!id
|| (id
== (sctp_assoc_t
)-1))
211 spin_lock_bh(&sctp_assocs_id_lock
);
212 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
213 spin_unlock_bh(&sctp_assocs_id_lock
);
215 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
221 /* Look up the transport from an address and an assoc id. If both address and
222 * id are specified, the associations matching the address and the id should be
225 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
226 struct sockaddr_storage
*addr
,
229 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
230 struct sctp_transport
*transport
;
231 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
233 laddr
->v4
.sin_port
= ntohs(laddr
->v4
.sin_port
);
234 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
235 (union sctp_addr
*)addr
,
237 laddr
->v4
.sin_port
= htons(laddr
->v4
.sin_port
);
242 id_asoc
= sctp_id2assoc(sk
, id
);
243 if (id_asoc
&& (id_asoc
!= addr_asoc
))
246 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
247 (union sctp_addr
*)addr
);
252 /* API 3.1.2 bind() - UDP Style Syntax
253 * The syntax of bind() is,
255 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
257 * sd - the socket descriptor returned by socket().
258 * addr - the address structure (struct sockaddr_in or struct
259 * sockaddr_in6 [RFC 2553]),
260 * addr_len - the size of the address structure.
262 SCTP_STATIC
int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
268 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
271 /* Disallow binding twice. */
272 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
273 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
278 sctp_release_sock(sk
);
283 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
285 /* Verify this is a valid sockaddr. */
286 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
287 union sctp_addr
*addr
, int len
)
291 /* Check minimum size. */
292 if (len
< sizeof (struct sockaddr
))
295 /* Does this PF support this AF? */
296 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
299 /* If we get this far, af is valid. */
300 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
302 if (len
< af
->sockaddr_len
)
308 /* Bind a local address either to an endpoint or to an association. */
309 SCTP_STATIC
int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
311 struct sctp_sock
*sp
= sctp_sk(sk
);
312 struct sctp_endpoint
*ep
= sp
->ep
;
313 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
318 /* Common sockaddr verification. */
319 af
= sctp_sockaddr_af(sp
, addr
, len
);
321 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
326 snum
= ntohs(addr
->v4
.sin_port
);
328 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
329 ", port: %d, new port: %d, len: %d)\n",
335 /* PF specific bind() address verification. */
336 if (!sp
->pf
->bind_verify(sp
, addr
))
337 return -EADDRNOTAVAIL
;
339 /* We must either be unbound, or bind to the same port. */
340 if (bp
->port
&& (snum
!= bp
->port
)) {
341 SCTP_DEBUG_PRINTK("sctp_do_bind:"
342 " New port %d does not match existing port "
343 "%d.\n", snum
, bp
->port
);
347 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
350 /* Make sure we are allowed to bind here.
351 * The function sctp_get_port_local() does duplicate address
354 if ((ret
= sctp_get_port_local(sk
, addr
))) {
355 if (ret
== (long) sk
) {
356 /* This endpoint has a conflicting address. */
363 /* Refresh ephemeral port. */
365 bp
->port
= inet_sk(sk
)->num
;
367 /* Add the address to the bind address list. */
368 sctp_local_bh_disable();
369 sctp_write_lock(&ep
->base
.addr_lock
);
371 /* Use GFP_ATOMIC since BHs are disabled. */
372 addr
->v4
.sin_port
= ntohs(addr
->v4
.sin_port
);
373 ret
= sctp_add_bind_addr(bp
, addr
, GFP_ATOMIC
);
374 addr
->v4
.sin_port
= htons(addr
->v4
.sin_port
);
375 sctp_write_unlock(&ep
->base
.addr_lock
);
376 sctp_local_bh_enable();
378 /* Copy back into socket for getsockname() use. */
380 inet_sk(sk
)->sport
= htons(inet_sk(sk
)->num
);
381 af
->to_sk_saddr(addr
, sk
);
387 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
389 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
390 * at any one time. If a sender, after sending an ASCONF chunk, decides
391 * it needs to transfer another ASCONF Chunk, it MUST wait until the
392 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
393 * subsequent ASCONF. Note this restriction binds each side, so at any
394 * time two ASCONF may be in-transit on any given association (one sent
395 * from each endpoint).
397 static int sctp_send_asconf(struct sctp_association
*asoc
,
398 struct sctp_chunk
*chunk
)
402 /* If there is an outstanding ASCONF chunk, queue it for later
405 if (asoc
->addip_last_asconf
) {
406 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
410 /* Hold the chunk until an ASCONF_ACK is received. */
411 sctp_chunk_hold(chunk
);
412 retval
= sctp_primitive_ASCONF(asoc
, chunk
);
414 sctp_chunk_free(chunk
);
416 asoc
->addip_last_asconf
= chunk
;
422 /* Add a list of addresses as bind addresses to local endpoint or
425 * Basically run through each address specified in the addrs/addrcnt
426 * array/length pair, determine if it is IPv6 or IPv4 and call
427 * sctp_do_bind() on it.
429 * If any of them fails, then the operation will be reversed and the
430 * ones that were added will be removed.
432 * Only sctp_setsockopt_bindx() is supposed to call this function.
434 int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
439 struct sockaddr
*sa_addr
;
442 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
446 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
447 /* The list may contain either IPv4 or IPv6 address;
448 * determine the address length for walking thru the list.
450 sa_addr
= (struct sockaddr
*)addr_buf
;
451 af
= sctp_get_af_specific(sa_addr
->sa_family
);
457 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
460 addr_buf
+= af
->sockaddr_len
;
464 /* Failed. Cleanup the ones that have been added */
466 sctp_bindx_rem(sk
, addrs
, cnt
);
474 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
475 * associations that are part of the endpoint indicating that a list of local
476 * addresses are added to the endpoint.
478 * If any of the addresses is already in the bind address list of the
479 * association, we do not send the chunk for that association. But it will not
480 * affect other associations.
482 * Only sctp_setsockopt_bindx() is supposed to call this function.
484 static int sctp_send_asconf_add_ip(struct sock
*sk
,
485 struct sockaddr
*addrs
,
488 struct sctp_sock
*sp
;
489 struct sctp_endpoint
*ep
;
490 struct sctp_association
*asoc
;
491 struct sctp_bind_addr
*bp
;
492 struct sctp_chunk
*chunk
;
493 struct sctp_sockaddr_entry
*laddr
;
494 union sctp_addr
*addr
;
497 struct list_head
*pos
;
502 if (!sctp_addip_enable
)
508 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
509 __FUNCTION__
, sk
, addrs
, addrcnt
);
511 list_for_each(pos
, &ep
->asocs
) {
512 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
514 if (!asoc
->peer
.asconf_capable
)
517 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
520 if (!sctp_state(asoc
, ESTABLISHED
))
523 /* Check if any address in the packed array of addresses is
524 * in the bind address list of the association. If so,
525 * do not send the asconf chunk to its peer, but continue with
526 * other associations.
529 for (i
= 0; i
< addrcnt
; i
++) {
530 addr
= (union sctp_addr
*)addr_buf
;
531 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
537 if (sctp_assoc_lookup_laddr(asoc
, addr
))
540 addr_buf
+= af
->sockaddr_len
;
545 /* Use the first address in bind addr list of association as
546 * Address Parameter of ASCONF CHUNK.
548 sctp_read_lock(&asoc
->base
.addr_lock
);
549 bp
= &asoc
->base
.bind_addr
;
550 p
= bp
->address_list
.next
;
551 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
552 sctp_read_unlock(&asoc
->base
.addr_lock
);
554 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
555 addrcnt
, SCTP_PARAM_ADD_IP
);
561 retval
= sctp_send_asconf(asoc
, chunk
);
563 /* FIXME: After sending the add address ASCONF chunk, we
564 * cannot append the address to the association's binding
565 * address list, because the new address may be used as the
566 * source of a message sent to the peer before the ASCONF
567 * chunk is received by the peer. So we should wait until
568 * ASCONF_ACK is received.
576 /* Remove a list of addresses from bind addresses list. Do not remove the
579 * Basically run through each address specified in the addrs/addrcnt
580 * array/length pair, determine if it is IPv6 or IPv4 and call
581 * sctp_del_bind() on it.
583 * If any of them fails, then the operation will be reversed and the
584 * ones that were removed will be added back.
586 * At least one address has to be left; if only one address is
587 * available, the operation will return -EBUSY.
589 * Only sctp_setsockopt_bindx() is supposed to call this function.
591 int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
593 struct sctp_sock
*sp
= sctp_sk(sk
);
594 struct sctp_endpoint
*ep
= sp
->ep
;
596 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
598 union sctp_addr saveaddr
;
600 struct sockaddr
*sa_addr
;
603 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
607 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
608 /* If the bind address list is empty or if there is only one
609 * bind address, there is nothing more to be removed (we need
610 * at least one address here).
612 if (list_empty(&bp
->address_list
) ||
613 (sctp_list_single_entry(&bp
->address_list
))) {
618 /* The list may contain either IPv4 or IPv6 address;
619 * determine the address length to copy the address to
622 sa_addr
= (struct sockaddr
*)addr_buf
;
623 af
= sctp_get_af_specific(sa_addr
->sa_family
);
628 memcpy(&saveaddr
, sa_addr
, af
->sockaddr_len
);
629 saveaddr
.v4
.sin_port
= ntohs(saveaddr
.v4
.sin_port
);
630 if (saveaddr
.v4
.sin_port
!= bp
->port
) {
635 /* FIXME - There is probably a need to check if sk->sk_saddr and
636 * sk->sk_rcv_addr are currently set to one of the addresses to
637 * be removed. This is something which needs to be looked into
638 * when we are fixing the outstanding issues with multi-homing
639 * socket routing and failover schemes. Refer to comments in
640 * sctp_do_bind(). -daisy
642 sctp_local_bh_disable();
643 sctp_write_lock(&ep
->base
.addr_lock
);
645 retval
= sctp_del_bind_addr(bp
, &saveaddr
);
647 sctp_write_unlock(&ep
->base
.addr_lock
);
648 sctp_local_bh_enable();
650 addr_buf
+= af
->sockaddr_len
;
653 /* Failed. Add the ones that has been removed back */
655 sctp_bindx_add(sk
, addrs
, cnt
);
663 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
664 * the associations that are part of the endpoint indicating that a list of
665 * local addresses are removed from the endpoint.
667 * If any of the addresses is already in the bind address list of the
668 * association, we do not send the chunk for that association. But it will not
669 * affect other associations.
671 * Only sctp_setsockopt_bindx() is supposed to call this function.
673 static int sctp_send_asconf_del_ip(struct sock
*sk
,
674 struct sockaddr
*addrs
,
677 struct sctp_sock
*sp
;
678 struct sctp_endpoint
*ep
;
679 struct sctp_association
*asoc
;
680 struct sctp_bind_addr
*bp
;
681 struct sctp_chunk
*chunk
;
682 union sctp_addr
*laddr
;
685 struct list_head
*pos
;
689 if (!sctp_addip_enable
)
695 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
696 __FUNCTION__
, sk
, addrs
, addrcnt
);
698 list_for_each(pos
, &ep
->asocs
) {
699 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
701 if (!asoc
->peer
.asconf_capable
)
704 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
707 if (!sctp_state(asoc
, ESTABLISHED
))
710 /* Check if any address in the packed array of addresses is
711 * not present in the bind address list of the association.
712 * If so, do not send the asconf chunk to its peer, but
713 * continue with other associations.
716 for (i
= 0; i
< addrcnt
; i
++) {
717 laddr
= (union sctp_addr
*)addr_buf
;
718 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
724 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
727 addr_buf
+= af
->sockaddr_len
;
732 /* Find one address in the association's bind address list
733 * that is not in the packed array of addresses. This is to
734 * make sure that we do not delete all the addresses in the
737 sctp_read_lock(&asoc
->base
.addr_lock
);
738 bp
= &asoc
->base
.bind_addr
;
739 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
741 sctp_read_unlock(&asoc
->base
.addr_lock
);
745 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
752 retval
= sctp_send_asconf(asoc
, chunk
);
754 /* FIXME: After sending the delete address ASCONF chunk, we
755 * cannot remove the addresses from the association's bind
756 * address list, because there maybe some packet send to
757 * the delete addresses, so we should wait until ASCONF_ACK
758 * packet is received.
765 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
768 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
771 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
772 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
775 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
776 * Section 3.1.2 for this usage.
778 * addrs is a pointer to an array of one or more socket addresses. Each
779 * address is contained in its appropriate structure (i.e. struct
780 * sockaddr_in or struct sockaddr_in6) the family of the address type
781 * must be used to distengish the address length (note that this
782 * representation is termed a "packed array" of addresses). The caller
783 * specifies the number of addresses in the array with addrcnt.
785 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
786 * -1, and sets errno to the appropriate error code.
788 * For SCTP, the port given in each socket address must be the same, or
789 * sctp_bindx() will fail, setting errno to EINVAL.
791 * The flags parameter is formed from the bitwise OR of zero or more of
792 * the following currently defined flags:
794 * SCTP_BINDX_ADD_ADDR
796 * SCTP_BINDX_REM_ADDR
798 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
799 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
800 * addresses from the association. The two flags are mutually exclusive;
801 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
802 * not remove all addresses from an association; sctp_bindx() will
803 * reject such an attempt with EINVAL.
805 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
806 * additional addresses with an endpoint after calling bind(). Or use
807 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
808 * socket is associated with so that no new association accepted will be
809 * associated with those addresses. If the endpoint supports dynamic
810 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
811 * endpoint to send the appropriate message to the peer to change the
812 * peers address lists.
814 * Adding and removing addresses from a connected association is
815 * optional functionality. Implementations that do not support this
816 * functionality should return EOPNOTSUPP.
818 * Basically do nothing but copying the addresses from user to kernel
819 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
820 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
823 * We don't use copy_from_user() for optimization: we first do the
824 * sanity checks (buffer size -fast- and access check-healthy
825 * pointer); if all of those succeed, then we can alloc the memory
826 * (expensive operation) needed to copy the data to kernel. Then we do
827 * the copying without checking the user space area
828 * (__copy_from_user()).
830 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
833 * sk The sk of the socket
834 * addrs The pointer to the addresses in user land
835 * addrssize Size of the addrs buffer
836 * op Operation to perform (add or remove, see the flags of
839 * Returns 0 if ok, <0 errno code on error.
841 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
842 struct sockaddr __user
*addrs
,
843 int addrs_size
, int op
)
845 struct sockaddr
*kaddrs
;
849 struct sockaddr
*sa_addr
;
853 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
854 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
856 if (unlikely(addrs_size
<= 0))
859 /* Check the user passed a healthy pointer. */
860 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
863 /* Alloc space for the address array in kernel memory. */
864 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
865 if (unlikely(!kaddrs
))
868 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
873 /* Walk through the addrs buffer and count the number of addresses. */
875 while (walk_size
< addrs_size
) {
876 sa_addr
= (struct sockaddr
*)addr_buf
;
877 af
= sctp_get_af_specific(sa_addr
->sa_family
);
879 /* If the address family is not supported or if this address
880 * causes the address buffer to overflow return EINVAL.
882 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
887 addr_buf
+= af
->sockaddr_len
;
888 walk_size
+= af
->sockaddr_len
;
893 case SCTP_BINDX_ADD_ADDR
:
894 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
897 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
900 case SCTP_BINDX_REM_ADDR
:
901 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
904 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
918 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
920 * Common routine for handling connect() and sctp_connectx().
921 * Connect will come in with just a single address.
923 static int __sctp_connect(struct sock
* sk
,
924 struct sockaddr
*kaddrs
,
927 struct sctp_sock
*sp
;
928 struct sctp_endpoint
*ep
;
929 struct sctp_association
*asoc
= NULL
;
930 struct sctp_association
*asoc2
;
931 struct sctp_transport
*transport
;
939 struct sockaddr
*sa_addr
;
945 /* connect() cannot be done on a socket that is already in ESTABLISHED
946 * state - UDP-style peeled off socket or a TCP-style socket that
947 * is already connected.
948 * It cannot be done even on a TCP-style listening socket.
950 if (sctp_sstate(sk
, ESTABLISHED
) ||
951 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
956 /* Walk through the addrs buffer and count the number of addresses. */
958 while (walk_size
< addrs_size
) {
959 sa_addr
= (struct sockaddr
*)addr_buf
;
960 af
= sctp_get_af_specific(sa_addr
->sa_family
);
962 /* If the address family is not supported or if this address
963 * causes the address buffer to overflow return EINVAL.
965 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
970 err
= sctp_verify_addr(sk
, (union sctp_addr
*)sa_addr
,
975 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
976 to
.v4
.sin_port
= ntohs(to
.v4
.sin_port
);
978 /* Check if there already is a matching association on the
979 * endpoint (other than the one created here).
981 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
982 if (asoc2
&& asoc2
!= asoc
) {
983 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
990 /* If we could not find a matching association on the endpoint,
991 * make sure that there is no peeled-off association matching
992 * the peer address even on another socket.
994 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
995 err
= -EADDRNOTAVAIL
;
1000 /* If a bind() or sctp_bindx() is not called prior to
1001 * an sctp_connectx() call, the system picks an
1002 * ephemeral port and will choose an address set
1003 * equivalent to binding with a wildcard address.
1005 if (!ep
->base
.bind_addr
.port
) {
1006 if (sctp_autobind(sk
)) {
1012 * If an unprivileged user inherits a 1-many
1013 * style socket with open associations on a
1014 * privileged port, it MAY be permitted to
1015 * accept new associations, but it SHOULD NOT
1016 * be permitted to open new associations.
1018 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1019 !capable(CAP_NET_BIND_SERVICE
)) {
1025 scope
= sctp_scope(&to
);
1026 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1033 /* Prime the peer's transport structures. */
1034 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1042 addr_buf
+= af
->sockaddr_len
;
1043 walk_size
+= af
->sockaddr_len
;
1046 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1051 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1056 /* Initialize sk's dport and daddr for getpeername() */
1057 inet_sk(sk
)->dport
= htons(asoc
->peer
.port
);
1058 af
= sctp_get_af_specific(to
.sa
.sa_family
);
1059 af
->to_sk_daddr(&to
, sk
);
1061 timeo
= sock_sndtimeo(sk
, sk
->sk_socket
->file
->f_flags
& O_NONBLOCK
);
1062 err
= sctp_wait_for_connect(asoc
, &timeo
);
1064 /* Don't free association on exit. */
1069 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1070 " kaddrs: %p err: %d\n",
1073 sctp_association_free(asoc
);
1077 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1080 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
1082 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1083 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1084 * or IPv6 addresses.
1086 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1087 * Section 3.1.2 for this usage.
1089 * addrs is a pointer to an array of one or more socket addresses. Each
1090 * address is contained in its appropriate structure (i.e. struct
1091 * sockaddr_in or struct sockaddr_in6) the family of the address type
1092 * must be used to distengish the address length (note that this
1093 * representation is termed a "packed array" of addresses). The caller
1094 * specifies the number of addresses in the array with addrcnt.
1096 * On success, sctp_connectx() returns 0. On failure, sctp_connectx() returns
1097 * -1, and sets errno to the appropriate error code.
1099 * For SCTP, the port given in each socket address must be the same, or
1100 * sctp_connectx() will fail, setting errno to EINVAL.
1102 * An application can use sctp_connectx to initiate an association with
1103 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1104 * allows a caller to specify multiple addresses at which a peer can be
1105 * reached. The way the SCTP stack uses the list of addresses to set up
1106 * the association is implementation dependant. This function only
1107 * specifies that the stack will try to make use of all the addresses in
1108 * the list when needed.
1110 * Note that the list of addresses passed in is only used for setting up
1111 * the association. It does not necessarily equal the set of addresses
1112 * the peer uses for the resulting association. If the caller wants to
1113 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1114 * retrieve them after the association has been set up.
1116 * Basically do nothing but copying the addresses from user to kernel
1117 * land and invoking either sctp_connectx(). This is used for tunneling
1118 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1120 * We don't use copy_from_user() for optimization: we first do the
1121 * sanity checks (buffer size -fast- and access check-healthy
1122 * pointer); if all of those succeed, then we can alloc the memory
1123 * (expensive operation) needed to copy the data to kernel. Then we do
1124 * the copying without checking the user space area
1125 * (__copy_from_user()).
1127 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1130 * sk The sk of the socket
1131 * addrs The pointer to the addresses in user land
1132 * addrssize Size of the addrs buffer
1134 * Returns 0 if ok, <0 errno code on error.
1136 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1137 struct sockaddr __user
*addrs
,
1141 struct sockaddr
*kaddrs
;
1143 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1144 __FUNCTION__
, sk
, addrs
, addrs_size
);
1146 if (unlikely(addrs_size
<= 0))
1149 /* Check the user passed a healthy pointer. */
1150 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1153 /* Alloc space for the address array in kernel memory. */
1154 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1155 if (unlikely(!kaddrs
))
1158 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1161 err
= __sctp_connect(sk
, kaddrs
, addrs_size
);
1168 /* API 3.1.4 close() - UDP Style Syntax
1169 * Applications use close() to perform graceful shutdown (as described in
1170 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1171 * by a UDP-style socket.
1175 * ret = close(int sd);
1177 * sd - the socket descriptor of the associations to be closed.
1179 * To gracefully shutdown a specific association represented by the
1180 * UDP-style socket, an application should use the sendmsg() call,
1181 * passing no user data, but including the appropriate flag in the
1182 * ancillary data (see Section xxxx).
1184 * If sd in the close() call is a branched-off socket representing only
1185 * one association, the shutdown is performed on that association only.
1187 * 4.1.6 close() - TCP Style Syntax
1189 * Applications use close() to gracefully close down an association.
1193 * int close(int sd);
1195 * sd - the socket descriptor of the association to be closed.
1197 * After an application calls close() on a socket descriptor, no further
1198 * socket operations will succeed on that descriptor.
1200 * API 7.1.4 SO_LINGER
1202 * An application using the TCP-style socket can use this option to
1203 * perform the SCTP ABORT primitive. The linger option structure is:
1206 * int l_onoff; // option on/off
1207 * int l_linger; // linger time
1210 * To enable the option, set l_onoff to 1. If the l_linger value is set
1211 * to 0, calling close() is the same as the ABORT primitive. If the
1212 * value is set to a negative value, the setsockopt() call will return
1213 * an error. If the value is set to a positive value linger_time, the
1214 * close() can be blocked for at most linger_time ms. If the graceful
1215 * shutdown phase does not finish during this period, close() will
1216 * return but the graceful shutdown phase continues in the system.
1218 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1220 struct sctp_endpoint
*ep
;
1221 struct sctp_association
*asoc
;
1222 struct list_head
*pos
, *temp
;
1224 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1227 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1229 ep
= sctp_sk(sk
)->ep
;
1231 /* Walk all associations on a socket, not on an endpoint. */
1232 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1233 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1235 if (sctp_style(sk
, TCP
)) {
1236 /* A closed association can still be in the list if
1237 * it belongs to a TCP-style listening socket that is
1238 * not yet accepted. If so, free it. If not, send an
1239 * ABORT or SHUTDOWN based on the linger options.
1241 if (sctp_state(asoc
, CLOSED
)) {
1242 sctp_unhash_established(asoc
);
1243 sctp_association_free(asoc
);
1245 } else if (sock_flag(sk
, SOCK_LINGER
) &&
1246 !sk
->sk_lingertime
) {
1247 struct sctp_chunk
*chunk
;
1249 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1251 sctp_primitive_ABORT(asoc
, chunk
);
1253 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1255 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1258 /* Clean up any skbs sitting on the receive queue. */
1259 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1260 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1262 /* On a TCP-style socket, block for at most linger_time if set. */
1263 if (sctp_style(sk
, TCP
) && timeout
)
1264 sctp_wait_for_close(sk
, timeout
);
1266 /* This will run the backlog queue. */
1267 sctp_release_sock(sk
);
1269 /* Supposedly, no process has access to the socket, but
1270 * the net layers still may.
1272 sctp_local_bh_disable();
1273 sctp_bh_lock_sock(sk
);
1275 /* Hold the sock, since sk_common_release() will put sock_put()
1276 * and we have just a little more cleanup.
1279 sk_common_release(sk
);
1281 sctp_bh_unlock_sock(sk
);
1282 sctp_local_bh_enable();
1286 SCTP_DBG_OBJCNT_DEC(sock
);
1289 /* Handle EPIPE error. */
1290 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1293 err
= sock_error(sk
) ? : -EPIPE
;
1294 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1295 send_sig(SIGPIPE
, current
, 0);
1299 /* API 3.1.3 sendmsg() - UDP Style Syntax
1301 * An application uses sendmsg() and recvmsg() calls to transmit data to
1302 * and receive data from its peer.
1304 * ssize_t sendmsg(int socket, const struct msghdr *message,
1307 * socket - the socket descriptor of the endpoint.
1308 * message - pointer to the msghdr structure which contains a single
1309 * user message and possibly some ancillary data.
1311 * See Section 5 for complete description of the data
1314 * flags - flags sent or received with the user message, see Section
1315 * 5 for complete description of the flags.
1317 * Note: This function could use a rewrite especially when explicit
1318 * connect support comes in.
1320 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1322 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1324 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1325 struct msghdr
*msg
, size_t msg_len
)
1327 struct sctp_sock
*sp
;
1328 struct sctp_endpoint
*ep
;
1329 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1330 struct sctp_transport
*transport
, *chunk_tp
;
1331 struct sctp_chunk
*chunk
;
1333 struct sockaddr
*msg_name
= NULL
;
1334 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1335 struct sctp_sndrcvinfo
*sinfo
;
1336 struct sctp_initmsg
*sinit
;
1337 sctp_assoc_t associd
= 0;
1338 sctp_cmsgs_t cmsgs
= { NULL
};
1342 __u16 sinfo_flags
= 0;
1343 struct sctp_datamsg
*datamsg
;
1344 struct list_head
*pos
;
1345 int msg_flags
= msg
->msg_flags
;
1347 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1354 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1356 /* We cannot send a message over a TCP-style listening socket. */
1357 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1362 /* Parse out the SCTP CMSGs. */
1363 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1366 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1370 /* Fetch the destination address for this packet. This
1371 * address only selects the association--it is not necessarily
1372 * the address we will send to.
1373 * For a peeled-off socket, msg_name is ignored.
1375 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1376 int msg_namelen
= msg
->msg_namelen
;
1378 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1383 if (msg_namelen
> sizeof(to
))
1384 msg_namelen
= sizeof(to
);
1385 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1386 SCTP_DEBUG_PRINTK("Just memcpy'd. msg_name is "
1388 to
.v4
.sin_addr
.s_addr
, to
.v4
.sin_port
);
1390 to
.v4
.sin_port
= ntohs(to
.v4
.sin_port
);
1391 msg_name
= msg
->msg_name
;
1397 /* Did the user specify SNDRCVINFO? */
1399 sinfo_flags
= sinfo
->sinfo_flags
;
1400 associd
= sinfo
->sinfo_assoc_id
;
1403 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1404 msg_len
, sinfo_flags
);
1406 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1407 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1412 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1413 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1414 * If SCTP_ABORT is set, the message length could be non zero with
1415 * the msg_iov set to the user abort reason.
1417 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1418 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1423 /* If SCTP_ADDR_OVER is set, there must be an address
1424 * specified in msg_name.
1426 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1433 SCTP_DEBUG_PRINTK("About to look up association.\n");
1437 /* If a msg_name has been specified, assume this is to be used. */
1439 /* Look for a matching association on the endpoint. */
1440 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1442 /* If we could not find a matching association on the
1443 * endpoint, make sure that it is not a TCP-style
1444 * socket that already has an association or there is
1445 * no peeled-off association on another socket.
1447 if ((sctp_style(sk
, TCP
) &&
1448 sctp_sstate(sk
, ESTABLISHED
)) ||
1449 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1450 err
= -EADDRNOTAVAIL
;
1455 asoc
= sctp_id2assoc(sk
, associd
);
1463 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1465 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1466 * socket that has an association in CLOSED state. This can
1467 * happen when an accepted socket has an association that is
1470 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1475 if (sinfo_flags
& SCTP_EOF
) {
1476 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1478 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1482 if (sinfo_flags
& SCTP_ABORT
) {
1483 struct sctp_chunk
*chunk
;
1485 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1491 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1492 sctp_primitive_ABORT(asoc
, chunk
);
1498 /* Do we need to create the association? */
1500 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1502 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1507 /* Check for invalid stream against the stream counts,
1508 * either the default or the user specified stream counts.
1511 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1512 /* Check against the defaults. */
1513 if (sinfo
->sinfo_stream
>=
1514 sp
->initmsg
.sinit_num_ostreams
) {
1519 /* Check against the requested. */
1520 if (sinfo
->sinfo_stream
>=
1521 sinit
->sinit_num_ostreams
) {
1529 * API 3.1.2 bind() - UDP Style Syntax
1530 * If a bind() or sctp_bindx() is not called prior to a
1531 * sendmsg() call that initiates a new association, the
1532 * system picks an ephemeral port and will choose an address
1533 * set equivalent to binding with a wildcard address.
1535 if (!ep
->base
.bind_addr
.port
) {
1536 if (sctp_autobind(sk
)) {
1542 * If an unprivileged user inherits a one-to-many
1543 * style socket with open associations on a privileged
1544 * port, it MAY be permitted to accept new associations,
1545 * but it SHOULD NOT be permitted to open new
1548 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1549 !capable(CAP_NET_BIND_SERVICE
)) {
1555 scope
= sctp_scope(&to
);
1556 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1563 /* If the SCTP_INIT ancillary data is specified, set all
1564 * the association init values accordingly.
1567 if (sinit
->sinit_num_ostreams
) {
1568 asoc
->c
.sinit_num_ostreams
=
1569 sinit
->sinit_num_ostreams
;
1571 if (sinit
->sinit_max_instreams
) {
1572 asoc
->c
.sinit_max_instreams
=
1573 sinit
->sinit_max_instreams
;
1575 if (sinit
->sinit_max_attempts
) {
1576 asoc
->max_init_attempts
1577 = sinit
->sinit_max_attempts
;
1579 if (sinit
->sinit_max_init_timeo
) {
1580 asoc
->max_init_timeo
=
1581 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1585 /* Prime the peer's transport structures. */
1586 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1591 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1598 /* ASSERT: we have a valid association at this point. */
1599 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1602 /* If the user didn't specify SNDRCVINFO, make up one with
1605 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1606 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1607 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1608 default_sinfo
.sinfo_context
= asoc
->default_context
;
1609 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1610 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1611 sinfo
= &default_sinfo
;
1614 /* API 7.1.7, the sndbuf size per association bounds the
1615 * maximum size of data that can be sent in a single send call.
1617 if (msg_len
> sk
->sk_sndbuf
) {
1622 /* If fragmentation is disabled and the message length exceeds the
1623 * association fragmentation point, return EMSGSIZE. The I-D
1624 * does not specify what this error is, but this looks like
1627 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1633 /* Check for invalid stream. */
1634 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1640 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1641 if (!sctp_wspace(asoc
)) {
1642 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1647 /* If an address is passed with the sendto/sendmsg call, it is used
1648 * to override the primary destination address in the TCP model, or
1649 * when SCTP_ADDR_OVER flag is set in the UDP model.
1651 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1652 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1653 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1661 /* Auto-connect, if we aren't connected already. */
1662 if (sctp_state(asoc
, CLOSED
)) {
1663 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1666 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1669 /* Break the message into multiple chunks of maximum size. */
1670 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1676 /* Now send the (possibly) fragmented message. */
1677 list_for_each(pos
, &datamsg
->chunks
) {
1678 chunk
= list_entry(pos
, struct sctp_chunk
, frag_list
);
1679 sctp_datamsg_track(chunk
);
1681 /* Do accounting for the write space. */
1682 sctp_set_owner_w(chunk
);
1684 chunk
->transport
= chunk_tp
;
1686 /* Send it to the lower layers. Note: all chunks
1687 * must either fail or succeed. The lower layer
1688 * works that way today. Keep it that way or this
1691 err
= sctp_primitive_SEND(asoc
, chunk
);
1692 /* Did the lower layer accept the chunk? */
1694 sctp_chunk_free(chunk
);
1695 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1698 sctp_datamsg_free(datamsg
);
1704 /* If we are already past ASSOCIATE, the lower
1705 * layers are responsible for association cleanup.
1711 sctp_association_free(asoc
);
1713 sctp_release_sock(sk
);
1716 return sctp_error(sk
, msg_flags
, err
);
1723 err
= sock_error(sk
);
1733 /* This is an extended version of skb_pull() that removes the data from the
1734 * start of a skb even when data is spread across the list of skb's in the
1735 * frag_list. len specifies the total amount of data that needs to be removed.
1736 * when 'len' bytes could be removed from the skb, it returns 0.
1737 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1738 * could not be removed.
1740 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1742 struct sk_buff
*list
;
1743 int skb_len
= skb_headlen(skb
);
1746 if (len
<= skb_len
) {
1747 __skb_pull(skb
, len
);
1751 __skb_pull(skb
, skb_len
);
1753 for (list
= skb_shinfo(skb
)->frag_list
; list
; list
= list
->next
) {
1754 rlen
= sctp_skb_pull(list
, len
);
1755 skb
->len
-= (len
-rlen
);
1756 skb
->data_len
-= (len
-rlen
);
1767 /* API 3.1.3 recvmsg() - UDP Style Syntax
1769 * ssize_t recvmsg(int socket, struct msghdr *message,
1772 * socket - the socket descriptor of the endpoint.
1773 * message - pointer to the msghdr structure which contains a single
1774 * user message and possibly some ancillary data.
1776 * See Section 5 for complete description of the data
1779 * flags - flags sent or received with the user message, see Section
1780 * 5 for complete description of the flags.
1782 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1784 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1785 struct msghdr
*msg
, size_t len
, int noblock
,
1786 int flags
, int *addr_len
)
1788 struct sctp_ulpevent
*event
= NULL
;
1789 struct sctp_sock
*sp
= sctp_sk(sk
);
1790 struct sk_buff
*skb
;
1795 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1796 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1797 "len", len
, "knoblauch", noblock
,
1798 "flags", flags
, "addr_len", addr_len
);
1802 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1807 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1811 /* Get the total length of the skb including any skb's in the
1820 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1822 event
= sctp_skb2event(skb
);
1827 sock_recv_timestamp(msg
, sk
, skb
);
1828 if (sctp_ulpevent_is_notification(event
)) {
1829 msg
->msg_flags
|= MSG_NOTIFICATION
;
1830 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1832 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1835 /* Check if we allow SCTP_SNDRCVINFO. */
1836 if (sp
->subscribe
.sctp_data_io_event
)
1837 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1839 /* FIXME: we should be calling IP/IPv6 layers. */
1840 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1841 ip_cmsg_recv(msg
, skb
);
1846 /* If skb's length exceeds the user's buffer, update the skb and
1847 * push it back to the receive_queue so that the next call to
1848 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1850 if (skb_len
> copied
) {
1851 msg
->msg_flags
&= ~MSG_EOR
;
1852 if (flags
& MSG_PEEK
)
1854 sctp_skb_pull(skb
, copied
);
1855 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1857 /* When only partial message is copied to the user, increase
1858 * rwnd by that amount. If all the data in the skb is read,
1859 * rwnd is updated when the event is freed.
1861 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
1863 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
1864 (event
->msg_flags
& MSG_EOR
))
1865 msg
->msg_flags
|= MSG_EOR
;
1867 msg
->msg_flags
&= ~MSG_EOR
;
1870 if (flags
& MSG_PEEK
) {
1871 /* Release the skb reference acquired after peeking the skb in
1872 * sctp_skb_recv_datagram().
1876 /* Free the event which includes releasing the reference to
1877 * the owner of the skb, freeing the skb and updating the
1880 sctp_ulpevent_free(event
);
1883 sctp_release_sock(sk
);
1887 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1889 * This option is a on/off flag. If enabled no SCTP message
1890 * fragmentation will be performed. Instead if a message being sent
1891 * exceeds the current PMTU size, the message will NOT be sent and
1892 * instead a error will be indicated to the user.
1894 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
1895 char __user
*optval
, int optlen
)
1899 if (optlen
< sizeof(int))
1902 if (get_user(val
, (int __user
*)optval
))
1905 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
1910 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
1913 if (optlen
!= sizeof(struct sctp_event_subscribe
))
1915 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
1920 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
1922 * This socket option is applicable to the UDP-style socket only. When
1923 * set it will cause associations that are idle for more than the
1924 * specified number of seconds to automatically close. An association
1925 * being idle is defined an association that has NOT sent or received
1926 * user data. The special value of '0' indicates that no automatic
1927 * close of any associations should be performed. The option expects an
1928 * integer defining the number of seconds of idle time before an
1929 * association is closed.
1931 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
1934 struct sctp_sock
*sp
= sctp_sk(sk
);
1936 /* Applicable to UDP-style socket only */
1937 if (sctp_style(sk
, TCP
))
1939 if (optlen
!= sizeof(int))
1941 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
1947 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
1949 * Applications can enable or disable heartbeats for any peer address of
1950 * an association, modify an address's heartbeat interval, force a
1951 * heartbeat to be sent immediately, and adjust the address's maximum
1952 * number of retransmissions sent before an address is considered
1953 * unreachable. The following structure is used to access and modify an
1954 * address's parameters:
1956 * struct sctp_paddrparams {
1957 * sctp_assoc_t spp_assoc_id;
1958 * struct sockaddr_storage spp_address;
1959 * uint32_t spp_hbinterval;
1960 * uint16_t spp_pathmaxrxt;
1961 * uint32_t spp_pathmtu;
1962 * uint32_t spp_sackdelay;
1963 * uint32_t spp_flags;
1966 * spp_assoc_id - (one-to-many style socket) This is filled in the
1967 * application, and identifies the association for
1969 * spp_address - This specifies which address is of interest.
1970 * spp_hbinterval - This contains the value of the heartbeat interval,
1971 * in milliseconds. If a value of zero
1972 * is present in this field then no changes are to
1973 * be made to this parameter.
1974 * spp_pathmaxrxt - This contains the maximum number of
1975 * retransmissions before this address shall be
1976 * considered unreachable. If a value of zero
1977 * is present in this field then no changes are to
1978 * be made to this parameter.
1979 * spp_pathmtu - When Path MTU discovery is disabled the value
1980 * specified here will be the "fixed" path mtu.
1981 * Note that if the spp_address field is empty
1982 * then all associations on this address will
1983 * have this fixed path mtu set upon them.
1985 * spp_sackdelay - When delayed sack is enabled, this value specifies
1986 * the number of milliseconds that sacks will be delayed
1987 * for. This value will apply to all addresses of an
1988 * association if the spp_address field is empty. Note
1989 * also, that if delayed sack is enabled and this
1990 * value is set to 0, no change is made to the last
1991 * recorded delayed sack timer value.
1993 * spp_flags - These flags are used to control various features
1994 * on an association. The flag field may contain
1995 * zero or more of the following options.
1997 * SPP_HB_ENABLE - Enable heartbeats on the
1998 * specified address. Note that if the address
1999 * field is empty all addresses for the association
2000 * have heartbeats enabled upon them.
2002 * SPP_HB_DISABLE - Disable heartbeats on the
2003 * speicifed address. Note that if the address
2004 * field is empty all addresses for the association
2005 * will have their heartbeats disabled. Note also
2006 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2007 * mutually exclusive, only one of these two should
2008 * be specified. Enabling both fields will have
2009 * undetermined results.
2011 * SPP_HB_DEMAND - Request a user initiated heartbeat
2012 * to be made immediately.
2014 * SPP_PMTUD_ENABLE - This field will enable PMTU
2015 * discovery upon the specified address. Note that
2016 * if the address feild is empty then all addresses
2017 * on the association are effected.
2019 * SPP_PMTUD_DISABLE - This field will disable PMTU
2020 * discovery upon the specified address. Note that
2021 * if the address feild is empty then all addresses
2022 * on the association are effected. Not also that
2023 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2024 * exclusive. Enabling both will have undetermined
2027 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2028 * on delayed sack. The time specified in spp_sackdelay
2029 * is used to specify the sack delay for this address. Note
2030 * that if spp_address is empty then all addresses will
2031 * enable delayed sack and take on the sack delay
2032 * value specified in spp_sackdelay.
2033 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2034 * off delayed sack. If the spp_address field is blank then
2035 * delayed sack is disabled for the entire association. Note
2036 * also that this field is mutually exclusive to
2037 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2040 int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2041 struct sctp_transport
*trans
,
2042 struct sctp_association
*asoc
,
2043 struct sctp_sock
*sp
,
2046 int sackdelay_change
)
2050 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2051 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2056 if (params
->spp_hbinterval
) {
2058 trans
->hbinterval
= msecs_to_jiffies(params
->spp_hbinterval
);
2060 asoc
->hbinterval
= msecs_to_jiffies(params
->spp_hbinterval
);
2062 sp
->hbinterval
= params
->spp_hbinterval
;
2068 trans
->param_flags
=
2069 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2072 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2075 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2079 if (params
->spp_pathmtu
) {
2081 trans
->pathmtu
= params
->spp_pathmtu
;
2082 sctp_assoc_sync_pmtu(asoc
);
2084 asoc
->pathmtu
= params
->spp_pathmtu
;
2085 sctp_frag_point(sp
, params
->spp_pathmtu
);
2087 sp
->pathmtu
= params
->spp_pathmtu
;
2093 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2094 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2095 trans
->param_flags
=
2096 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2098 sctp_transport_pmtu(trans
);
2099 sctp_assoc_sync_pmtu(asoc
);
2103 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2106 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2110 if (params
->spp_sackdelay
) {
2113 msecs_to_jiffies(params
->spp_sackdelay
);
2116 msecs_to_jiffies(params
->spp_sackdelay
);
2118 sp
->sackdelay
= params
->spp_sackdelay
;
2122 if (sackdelay_change
) {
2124 trans
->param_flags
=
2125 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2129 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2133 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2138 if (params
->spp_pathmaxrxt
) {
2140 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2142 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2144 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2151 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2152 char __user
*optval
, int optlen
)
2154 struct sctp_paddrparams params
;
2155 struct sctp_transport
*trans
= NULL
;
2156 struct sctp_association
*asoc
= NULL
;
2157 struct sctp_sock
*sp
= sctp_sk(sk
);
2159 int hb_change
, pmtud_change
, sackdelay_change
;
2161 if (optlen
!= sizeof(struct sctp_paddrparams
))
2164 if (copy_from_user(¶ms
, optval
, optlen
))
2167 /* Validate flags and value parameters. */
2168 hb_change
= params
.spp_flags
& SPP_HB
;
2169 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2170 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2172 if (hb_change
== SPP_HB
||
2173 pmtud_change
== SPP_PMTUD
||
2174 sackdelay_change
== SPP_SACKDELAY
||
2175 params
.spp_sackdelay
> 500 ||
2177 && params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2180 /* If an address other than INADDR_ANY is specified, and
2181 * no transport is found, then the request is invalid.
2183 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
2184 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2185 params
.spp_assoc_id
);
2190 /* Get association, if assoc_id != 0 and the socket is a one
2191 * to many style socket, and an association was not found, then
2192 * the id was invalid.
2194 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2195 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2198 /* Heartbeat demand can only be sent on a transport or
2199 * association, but not a socket.
2201 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2204 /* Process parameters. */
2205 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2206 hb_change
, pmtud_change
,
2212 /* If changes are for association, also apply parameters to each
2215 if (!trans
&& asoc
) {
2216 struct list_head
*pos
;
2218 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2219 trans
= list_entry(pos
, struct sctp_transport
,
2221 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2222 hb_change
, pmtud_change
,
2230 /* 7.1.24. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
2232 * This options will get or set the delayed ack timer. The time is set
2233 * in milliseconds. If the assoc_id is 0, then this sets or gets the
2234 * endpoints default delayed ack timer value. If the assoc_id field is
2235 * non-zero, then the set or get effects the specified association.
2237 * struct sctp_assoc_value {
2238 * sctp_assoc_t assoc_id;
2239 * uint32_t assoc_value;
2242 * assoc_id - This parameter, indicates which association the
2243 * user is preforming an action upon. Note that if
2244 * this field's value is zero then the endpoints
2245 * default value is changed (effecting future
2246 * associations only).
2248 * assoc_value - This parameter contains the number of milliseconds
2249 * that the user is requesting the delayed ACK timer
2250 * be set to. Note that this value is defined in
2251 * the standard to be between 200 and 500 milliseconds.
2253 * Note: a value of zero will leave the value alone,
2254 * but disable SACK delay. A non-zero value will also
2255 * enable SACK delay.
2258 static int sctp_setsockopt_delayed_ack_time(struct sock
*sk
,
2259 char __user
*optval
, int optlen
)
2261 struct sctp_assoc_value params
;
2262 struct sctp_transport
*trans
= NULL
;
2263 struct sctp_association
*asoc
= NULL
;
2264 struct sctp_sock
*sp
= sctp_sk(sk
);
2266 if (optlen
!= sizeof(struct sctp_assoc_value
))
2269 if (copy_from_user(¶ms
, optval
, optlen
))
2272 /* Validate value parameter. */
2273 if (params
.assoc_value
> 500)
2276 /* Get association, if assoc_id != 0 and the socket is a one
2277 * to many style socket, and an association was not found, then
2278 * the id was invalid.
2280 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2281 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
2284 if (params
.assoc_value
) {
2287 msecs_to_jiffies(params
.assoc_value
);
2289 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2290 SPP_SACKDELAY_ENABLE
;
2292 sp
->sackdelay
= params
.assoc_value
;
2294 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2295 SPP_SACKDELAY_ENABLE
;
2300 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2301 SPP_SACKDELAY_DISABLE
;
2304 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2305 SPP_SACKDELAY_DISABLE
;
2309 /* If change is for association, also apply to each transport. */
2311 struct list_head
*pos
;
2313 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2314 trans
= list_entry(pos
, struct sctp_transport
,
2316 if (params
.assoc_value
) {
2318 msecs_to_jiffies(params
.assoc_value
);
2319 trans
->param_flags
=
2320 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2321 SPP_SACKDELAY_ENABLE
;
2323 trans
->param_flags
=
2324 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2325 SPP_SACKDELAY_DISABLE
;
2333 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2335 * Applications can specify protocol parameters for the default association
2336 * initialization. The option name argument to setsockopt() and getsockopt()
2339 * Setting initialization parameters is effective only on an unconnected
2340 * socket (for UDP-style sockets only future associations are effected
2341 * by the change). With TCP-style sockets, this option is inherited by
2342 * sockets derived from a listener socket.
2344 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, int optlen
)
2346 struct sctp_initmsg sinit
;
2347 struct sctp_sock
*sp
= sctp_sk(sk
);
2349 if (optlen
!= sizeof(struct sctp_initmsg
))
2351 if (copy_from_user(&sinit
, optval
, optlen
))
2354 if (sinit
.sinit_num_ostreams
)
2355 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2356 if (sinit
.sinit_max_instreams
)
2357 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2358 if (sinit
.sinit_max_attempts
)
2359 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2360 if (sinit
.sinit_max_init_timeo
)
2361 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2367 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2369 * Applications that wish to use the sendto() system call may wish to
2370 * specify a default set of parameters that would normally be supplied
2371 * through the inclusion of ancillary data. This socket option allows
2372 * such an application to set the default sctp_sndrcvinfo structure.
2373 * The application that wishes to use this socket option simply passes
2374 * in to this call the sctp_sndrcvinfo structure defined in Section
2375 * 5.2.2) The input parameters accepted by this call include
2376 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2377 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2378 * to this call if the caller is using the UDP model.
2380 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2381 char __user
*optval
, int optlen
)
2383 struct sctp_sndrcvinfo info
;
2384 struct sctp_association
*asoc
;
2385 struct sctp_sock
*sp
= sctp_sk(sk
);
2387 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2389 if (copy_from_user(&info
, optval
, optlen
))
2392 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2393 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2397 asoc
->default_stream
= info
.sinfo_stream
;
2398 asoc
->default_flags
= info
.sinfo_flags
;
2399 asoc
->default_ppid
= info
.sinfo_ppid
;
2400 asoc
->default_context
= info
.sinfo_context
;
2401 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2403 sp
->default_stream
= info
.sinfo_stream
;
2404 sp
->default_flags
= info
.sinfo_flags
;
2405 sp
->default_ppid
= info
.sinfo_ppid
;
2406 sp
->default_context
= info
.sinfo_context
;
2407 sp
->default_timetolive
= info
.sinfo_timetolive
;
2413 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2415 * Requests that the local SCTP stack use the enclosed peer address as
2416 * the association primary. The enclosed address must be one of the
2417 * association peer's addresses.
2419 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2422 struct sctp_prim prim
;
2423 struct sctp_transport
*trans
;
2425 if (optlen
!= sizeof(struct sctp_prim
))
2428 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2431 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2435 sctp_assoc_set_primary(trans
->asoc
, trans
);
2441 * 7.1.5 SCTP_NODELAY
2443 * Turn on/off any Nagle-like algorithm. This means that packets are
2444 * generally sent as soon as possible and no unnecessary delays are
2445 * introduced, at the cost of more packets in the network. Expects an
2446 * integer boolean flag.
2448 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2453 if (optlen
< sizeof(int))
2455 if (get_user(val
, (int __user
*)optval
))
2458 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2464 * 7.1.1 SCTP_RTOINFO
2466 * The protocol parameters used to initialize and bound retransmission
2467 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2468 * and modify these parameters.
2469 * All parameters are time values, in milliseconds. A value of 0, when
2470 * modifying the parameters, indicates that the current value should not
2474 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, int optlen
) {
2475 struct sctp_rtoinfo rtoinfo
;
2476 struct sctp_association
*asoc
;
2478 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2481 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2484 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2486 /* Set the values to the specific association */
2487 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2491 if (rtoinfo
.srto_initial
!= 0)
2493 msecs_to_jiffies(rtoinfo
.srto_initial
);
2494 if (rtoinfo
.srto_max
!= 0)
2495 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2496 if (rtoinfo
.srto_min
!= 0)
2497 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2499 /* If there is no association or the association-id = 0
2500 * set the values to the endpoint.
2502 struct sctp_sock
*sp
= sctp_sk(sk
);
2504 if (rtoinfo
.srto_initial
!= 0)
2505 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2506 if (rtoinfo
.srto_max
!= 0)
2507 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2508 if (rtoinfo
.srto_min
!= 0)
2509 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2517 * 7.1.2 SCTP_ASSOCINFO
2519 * This option is used to tune the the maximum retransmission attempts
2520 * of the association.
2521 * Returns an error if the new association retransmission value is
2522 * greater than the sum of the retransmission value of the peer.
2523 * See [SCTP] for more information.
2526 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, int optlen
)
2529 struct sctp_assocparams assocparams
;
2530 struct sctp_association
*asoc
;
2532 if (optlen
!= sizeof(struct sctp_assocparams
))
2534 if (copy_from_user(&assocparams
, optval
, optlen
))
2537 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2539 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2542 /* Set the values to the specific association */
2544 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2547 struct list_head
*pos
;
2548 struct sctp_transport
*peer_addr
;
2550 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2551 peer_addr
= list_entry(pos
,
2552 struct sctp_transport
,
2554 path_sum
+= peer_addr
->pathmaxrxt
;
2558 /* Only validate asocmaxrxt if we have more then
2559 * one path/transport. We do this because path
2560 * retransmissions are only counted when we have more
2564 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2567 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2570 if (assocparams
.sasoc_cookie_life
!= 0) {
2571 asoc
->cookie_life
.tv_sec
=
2572 assocparams
.sasoc_cookie_life
/ 1000;
2573 asoc
->cookie_life
.tv_usec
=
2574 (assocparams
.sasoc_cookie_life
% 1000)
2578 /* Set the values to the endpoint */
2579 struct sctp_sock
*sp
= sctp_sk(sk
);
2581 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2582 sp
->assocparams
.sasoc_asocmaxrxt
=
2583 assocparams
.sasoc_asocmaxrxt
;
2584 if (assocparams
.sasoc_cookie_life
!= 0)
2585 sp
->assocparams
.sasoc_cookie_life
=
2586 assocparams
.sasoc_cookie_life
;
2592 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2594 * This socket option is a boolean flag which turns on or off mapped V4
2595 * addresses. If this option is turned on and the socket is type
2596 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2597 * If this option is turned off, then no mapping will be done of V4
2598 * addresses and a user will receive both PF_INET6 and PF_INET type
2599 * addresses on the socket.
2601 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, int optlen
)
2604 struct sctp_sock
*sp
= sctp_sk(sk
);
2606 if (optlen
< sizeof(int))
2608 if (get_user(val
, (int __user
*)optval
))
2619 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2621 * This socket option specifies the maximum size to put in any outgoing
2622 * SCTP chunk. If a message is larger than this size it will be
2623 * fragmented by SCTP into the specified size. Note that the underlying
2624 * SCTP implementation may fragment into smaller sized chunks when the
2625 * PMTU of the underlying association is smaller than the value set by
2628 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, int optlen
)
2630 struct sctp_association
*asoc
;
2631 struct list_head
*pos
;
2632 struct sctp_sock
*sp
= sctp_sk(sk
);
2635 if (optlen
< sizeof(int))
2637 if (get_user(val
, (int __user
*)optval
))
2639 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2641 sp
->user_frag
= val
;
2643 /* Update the frag_point of the existing associations. */
2644 list_for_each(pos
, &(sp
->ep
->asocs
)) {
2645 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
2646 asoc
->frag_point
= sctp_frag_point(sp
, asoc
->pathmtu
);
2654 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2656 * Requests that the peer mark the enclosed address as the association
2657 * primary. The enclosed address must be one of the association's
2658 * locally bound addresses. The following structure is used to make a
2659 * set primary request:
2661 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2664 struct sctp_sock
*sp
;
2665 struct sctp_endpoint
*ep
;
2666 struct sctp_association
*asoc
= NULL
;
2667 struct sctp_setpeerprim prim
;
2668 struct sctp_chunk
*chunk
;
2674 if (!sctp_addip_enable
)
2677 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2680 if (copy_from_user(&prim
, optval
, optlen
))
2683 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2687 if (!asoc
->peer
.asconf_capable
)
2690 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2693 if (!sctp_state(asoc
, ESTABLISHED
))
2696 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2697 return -EADDRNOTAVAIL
;
2699 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2700 chunk
= sctp_make_asconf_set_prim(asoc
,
2701 (union sctp_addr
*)&prim
.sspp_addr
);
2705 err
= sctp_send_asconf(asoc
, chunk
);
2707 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2712 static int sctp_setsockopt_adaption_layer(struct sock
*sk
, char __user
*optval
,
2715 struct sctp_setadaption adaption
;
2717 if (optlen
!= sizeof(struct sctp_setadaption
))
2719 if (copy_from_user(&adaption
, optval
, optlen
))
2722 sctp_sk(sk
)->adaption_ind
= adaption
.ssb_adaption_ind
;
2727 /* API 6.2 setsockopt(), getsockopt()
2729 * Applications use setsockopt() and getsockopt() to set or retrieve
2730 * socket options. Socket options are used to change the default
2731 * behavior of sockets calls. They are described in Section 7.
2735 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
2736 * int __user *optlen);
2737 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
2740 * sd - the socket descript.
2741 * level - set to IPPROTO_SCTP for all SCTP options.
2742 * optname - the option name.
2743 * optval - the buffer to store the value of the option.
2744 * optlen - the size of the buffer.
2746 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
2747 char __user
*optval
, int optlen
)
2751 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
2754 /* I can hardly begin to describe how wrong this is. This is
2755 * so broken as to be worse than useless. The API draft
2756 * REALLY is NOT helpful here... I am not convinced that the
2757 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
2758 * are at all well-founded.
2760 if (level
!= SOL_SCTP
) {
2761 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
2762 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2769 case SCTP_SOCKOPT_BINDX_ADD
:
2770 /* 'optlen' is the size of the addresses buffer. */
2771 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2772 optlen
, SCTP_BINDX_ADD_ADDR
);
2775 case SCTP_SOCKOPT_BINDX_REM
:
2776 /* 'optlen' is the size of the addresses buffer. */
2777 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
2778 optlen
, SCTP_BINDX_REM_ADDR
);
2781 case SCTP_SOCKOPT_CONNECTX
:
2782 /* 'optlen' is the size of the addresses buffer. */
2783 retval
= sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)optval
,
2787 case SCTP_DISABLE_FRAGMENTS
:
2788 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
2792 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
2795 case SCTP_AUTOCLOSE
:
2796 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
2799 case SCTP_PEER_ADDR_PARAMS
:
2800 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
2803 case SCTP_DELAYED_ACK_TIME
:
2804 retval
= sctp_setsockopt_delayed_ack_time(sk
, optval
, optlen
);
2808 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
2810 case SCTP_DEFAULT_SEND_PARAM
:
2811 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
2814 case SCTP_PRIMARY_ADDR
:
2815 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
2817 case SCTP_SET_PEER_PRIMARY_ADDR
:
2818 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
2821 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
2824 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
2826 case SCTP_ASSOCINFO
:
2827 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
2829 case SCTP_I_WANT_MAPPED_V4_ADDR
:
2830 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
2833 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
2835 case SCTP_ADAPTION_LAYER
:
2836 retval
= sctp_setsockopt_adaption_layer(sk
, optval
, optlen
);
2840 retval
= -ENOPROTOOPT
;
2844 sctp_release_sock(sk
);
2850 /* API 3.1.6 connect() - UDP Style Syntax
2852 * An application may use the connect() call in the UDP model to initiate an
2853 * association without sending data.
2857 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
2859 * sd: the socket descriptor to have a new association added to.
2861 * nam: the address structure (either struct sockaddr_in or struct
2862 * sockaddr_in6 defined in RFC2553 [7]).
2864 * len: the size of the address.
2866 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
2874 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
2875 __FUNCTION__
, sk
, addr
, addr_len
);
2877 /* Validate addr_len before calling common connect/connectx routine. */
2878 af
= sctp_get_af_specific(addr
->sa_family
);
2879 if (!af
|| addr_len
< af
->sockaddr_len
) {
2882 /* Pass correct addr len to common routine (so it knows there
2883 * is only one address being passed.
2885 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
);
2888 sctp_release_sock(sk
);
2892 /* FIXME: Write comments. */
2893 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
2895 return -EOPNOTSUPP
; /* STUB */
2898 /* 4.1.4 accept() - TCP Style Syntax
2900 * Applications use accept() call to remove an established SCTP
2901 * association from the accept queue of the endpoint. A new socket
2902 * descriptor will be returned from accept() to represent the newly
2903 * formed association.
2905 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
2907 struct sctp_sock
*sp
;
2908 struct sctp_endpoint
*ep
;
2909 struct sock
*newsk
= NULL
;
2910 struct sctp_association
*asoc
;
2919 if (!sctp_style(sk
, TCP
)) {
2920 error
= -EOPNOTSUPP
;
2924 if (!sctp_sstate(sk
, LISTENING
)) {
2929 timeo
= sock_rcvtimeo(sk
, sk
->sk_socket
->file
->f_flags
& O_NONBLOCK
);
2931 error
= sctp_wait_for_accept(sk
, timeo
);
2935 /* We treat the list of associations on the endpoint as the accept
2936 * queue and pick the first association on the list.
2938 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
2940 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
2946 /* Populate the fields of the newsk from the oldsk and migrate the
2947 * asoc to the newsk.
2949 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
2952 sctp_release_sock(sk
);
2957 /* The SCTP ioctl handler. */
2958 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
2960 return -ENOIOCTLCMD
;
2963 /* This is the function which gets called during socket creation to
2964 * initialized the SCTP-specific portion of the sock.
2965 * The sock structure should already be zero-filled memory.
2967 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
2969 struct sctp_endpoint
*ep
;
2970 struct sctp_sock
*sp
;
2972 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
2976 /* Initialize the SCTP per socket area. */
2977 switch (sk
->sk_type
) {
2978 case SOCK_SEQPACKET
:
2979 sp
->type
= SCTP_SOCKET_UDP
;
2982 sp
->type
= SCTP_SOCKET_TCP
;
2985 return -ESOCKTNOSUPPORT
;
2988 /* Initialize default send parameters. These parameters can be
2989 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
2991 sp
->default_stream
= 0;
2992 sp
->default_ppid
= 0;
2993 sp
->default_flags
= 0;
2994 sp
->default_context
= 0;
2995 sp
->default_timetolive
= 0;
2997 /* Initialize default setup parameters. These parameters
2998 * can be modified with the SCTP_INITMSG socket option or
2999 * overridden by the SCTP_INIT CMSG.
3001 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3002 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3003 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3004 sp
->initmsg
.sinit_max_init_timeo
= jiffies_to_msecs(sctp_rto_max
);
3006 /* Initialize default RTO related parameters. These parameters can
3007 * be modified for with the SCTP_RTOINFO socket option.
3009 sp
->rtoinfo
.srto_initial
= jiffies_to_msecs(sctp_rto_initial
);
3010 sp
->rtoinfo
.srto_max
= jiffies_to_msecs(sctp_rto_max
);
3011 sp
->rtoinfo
.srto_min
= jiffies_to_msecs(sctp_rto_min
);
3013 /* Initialize default association related parameters. These parameters
3014 * can be modified with the SCTP_ASSOCINFO socket option.
3016 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3017 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3018 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3019 sp
->assocparams
.sasoc_local_rwnd
= 0;
3020 sp
->assocparams
.sasoc_cookie_life
=
3021 jiffies_to_msecs(sctp_valid_cookie_life
);
3023 /* Initialize default event subscriptions. By default, all the
3026 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3028 /* Default Peer Address Parameters. These defaults can
3029 * be modified via SCTP_PEER_ADDR_PARAMS
3031 sp
->hbinterval
= jiffies_to_msecs(sctp_hb_interval
);
3032 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3033 sp
->pathmtu
= 0; // allow default discovery
3034 sp
->sackdelay
= jiffies_to_msecs(sctp_sack_timeout
);
3035 sp
->param_flags
= SPP_HB_ENABLE
|
3037 SPP_SACKDELAY_ENABLE
;
3039 /* If enabled no SCTP message fragmentation will be performed.
3040 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3042 sp
->disable_fragments
= 0;
3044 /* Turn on/off any Nagle-like algorithm. */
3047 /* Enable by default. */
3050 /* Auto-close idle associations after the configured
3051 * number of seconds. A value of 0 disables this
3052 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3053 * for UDP-style sockets only.
3057 /* User specified fragmentation limit. */
3060 sp
->adaption_ind
= 0;
3062 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3064 /* Control variables for partial data delivery. */
3066 skb_queue_head_init(&sp
->pd_lobby
);
3068 /* Create a per socket endpoint structure. Even if we
3069 * change the data structure relationships, this may still
3070 * be useful for storing pre-connect address information.
3072 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3079 SCTP_DBG_OBJCNT_INC(sock
);
3083 /* Cleanup any SCTP per socket resources. */
3084 SCTP_STATIC
int sctp_destroy_sock(struct sock
*sk
)
3086 struct sctp_endpoint
*ep
;
3088 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3090 /* Release our hold on the endpoint. */
3091 ep
= sctp_sk(sk
)->ep
;
3092 sctp_endpoint_free(ep
);
3097 /* API 4.1.7 shutdown() - TCP Style Syntax
3098 * int shutdown(int socket, int how);
3100 * sd - the socket descriptor of the association to be closed.
3101 * how - Specifies the type of shutdown. The values are
3104 * Disables further receive operations. No SCTP
3105 * protocol action is taken.
3107 * Disables further send operations, and initiates
3108 * the SCTP shutdown sequence.
3110 * Disables further send and receive operations
3111 * and initiates the SCTP shutdown sequence.
3113 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3115 struct sctp_endpoint
*ep
;
3116 struct sctp_association
*asoc
;
3118 if (!sctp_style(sk
, TCP
))
3121 if (how
& SEND_SHUTDOWN
) {
3122 ep
= sctp_sk(sk
)->ep
;
3123 if (!list_empty(&ep
->asocs
)) {
3124 asoc
= list_entry(ep
->asocs
.next
,
3125 struct sctp_association
, asocs
);
3126 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3131 /* 7.2.1 Association Status (SCTP_STATUS)
3133 * Applications can retrieve current status information about an
3134 * association, including association state, peer receiver window size,
3135 * number of unacked data chunks, and number of data chunks pending
3136 * receipt. This information is read-only.
3138 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3139 char __user
*optval
,
3142 struct sctp_status status
;
3143 struct sctp_association
*asoc
= NULL
;
3144 struct sctp_transport
*transport
;
3145 sctp_assoc_t associd
;
3148 if (len
!= sizeof(status
)) {
3153 if (copy_from_user(&status
, optval
, sizeof(status
))) {
3158 associd
= status
.sstat_assoc_id
;
3159 asoc
= sctp_id2assoc(sk
, associd
);
3165 transport
= asoc
->peer
.primary_path
;
3167 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3168 status
.sstat_state
= asoc
->state
;
3169 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3170 status
.sstat_unackdata
= asoc
->unack_data
;
3172 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3173 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3174 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3175 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3176 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3177 memcpy(&status
.sstat_primary
.spinfo_address
,
3178 &(transport
->ipaddr
), sizeof(union sctp_addr
));
3179 /* Map ipv4 address into v4-mapped-on-v6 address. */
3180 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3181 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3182 status
.sstat_primary
.spinfo_state
= transport
->state
;
3183 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3184 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3185 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3186 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3188 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3189 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3191 if (put_user(len
, optlen
)) {
3196 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3197 len
, status
.sstat_state
, status
.sstat_rwnd
,
3198 status
.sstat_assoc_id
);
3200 if (copy_to_user(optval
, &status
, len
)) {
3210 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3212 * Applications can retrieve information about a specific peer address
3213 * of an association, including its reachability state, congestion
3214 * window, and retransmission timer values. This information is
3217 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3218 char __user
*optval
,
3221 struct sctp_paddrinfo pinfo
;
3222 struct sctp_transport
*transport
;
3225 if (len
!= sizeof(pinfo
)) {
3230 if (copy_from_user(&pinfo
, optval
, sizeof(pinfo
))) {
3235 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3236 pinfo
.spinfo_assoc_id
);
3240 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3241 pinfo
.spinfo_state
= transport
->state
;
3242 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3243 pinfo
.spinfo_srtt
= transport
->srtt
;
3244 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3245 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3247 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3248 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3250 if (put_user(len
, optlen
)) {
3255 if (copy_to_user(optval
, &pinfo
, len
)) {
3264 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3266 * This option is a on/off flag. If enabled no SCTP message
3267 * fragmentation will be performed. Instead if a message being sent
3268 * exceeds the current PMTU size, the message will NOT be sent and
3269 * instead a error will be indicated to the user.
3271 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3272 char __user
*optval
, int __user
*optlen
)
3276 if (len
< sizeof(int))
3280 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3281 if (put_user(len
, optlen
))
3283 if (copy_to_user(optval
, &val
, len
))
3288 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3290 * This socket option is used to specify various notifications and
3291 * ancillary data the user wishes to receive.
3293 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
3296 if (len
!= sizeof(struct sctp_event_subscribe
))
3298 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
3303 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3305 * This socket option is applicable to the UDP-style socket only. When
3306 * set it will cause associations that are idle for more than the
3307 * specified number of seconds to automatically close. An association
3308 * being idle is defined an association that has NOT sent or received
3309 * user data. The special value of '0' indicates that no automatic
3310 * close of any associations should be performed. The option expects an
3311 * integer defining the number of seconds of idle time before an
3312 * association is closed.
3314 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3316 /* Applicable to UDP-style socket only */
3317 if (sctp_style(sk
, TCP
))
3319 if (len
!= sizeof(int))
3321 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, len
))
3326 /* Helper routine to branch off an association to a new socket. */
3327 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3328 struct socket
**sockp
)
3330 struct sock
*sk
= asoc
->base
.sk
;
3331 struct socket
*sock
;
3334 /* An association cannot be branched off from an already peeled-off
3335 * socket, nor is this supported for tcp style sockets.
3337 if (!sctp_style(sk
, UDP
))
3340 /* Create a new socket. */
3341 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
3345 /* Populate the fields of the newsk from the oldsk and migrate the
3346 * asoc to the newsk.
3348 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
3354 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3356 sctp_peeloff_arg_t peeloff
;
3357 struct socket
*newsock
;
3359 struct sctp_association
*asoc
;
3361 if (len
!= sizeof(sctp_peeloff_arg_t
))
3363 if (copy_from_user(&peeloff
, optval
, len
))
3366 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
3372 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __FUNCTION__
, sk
, asoc
);
3374 retval
= sctp_do_peeloff(asoc
, &newsock
);
3378 /* Map the socket to an unused fd that can be returned to the user. */
3379 retval
= sock_map_fd(newsock
);
3381 sock_release(newsock
);
3385 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3386 __FUNCTION__
, sk
, asoc
, newsock
->sk
, retval
);
3388 /* Return the fd mapped to the new socket. */
3389 peeloff
.sd
= retval
;
3390 if (copy_to_user(optval
, &peeloff
, len
))
3397 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3399 * Applications can enable or disable heartbeats for any peer address of
3400 * an association, modify an address's heartbeat interval, force a
3401 * heartbeat to be sent immediately, and adjust the address's maximum
3402 * number of retransmissions sent before an address is considered
3403 * unreachable. The following structure is used to access and modify an
3404 * address's parameters:
3406 * struct sctp_paddrparams {
3407 * sctp_assoc_t spp_assoc_id;
3408 * struct sockaddr_storage spp_address;
3409 * uint32_t spp_hbinterval;
3410 * uint16_t spp_pathmaxrxt;
3411 * uint32_t spp_pathmtu;
3412 * uint32_t spp_sackdelay;
3413 * uint32_t spp_flags;
3416 * spp_assoc_id - (one-to-many style socket) This is filled in the
3417 * application, and identifies the association for
3419 * spp_address - This specifies which address is of interest.
3420 * spp_hbinterval - This contains the value of the heartbeat interval,
3421 * in milliseconds. If a value of zero
3422 * is present in this field then no changes are to
3423 * be made to this parameter.
3424 * spp_pathmaxrxt - This contains the maximum number of
3425 * retransmissions before this address shall be
3426 * considered unreachable. If a value of zero
3427 * is present in this field then no changes are to
3428 * be made to this parameter.
3429 * spp_pathmtu - When Path MTU discovery is disabled the value
3430 * specified here will be the "fixed" path mtu.
3431 * Note that if the spp_address field is empty
3432 * then all associations on this address will
3433 * have this fixed path mtu set upon them.
3435 * spp_sackdelay - When delayed sack is enabled, this value specifies
3436 * the number of milliseconds that sacks will be delayed
3437 * for. This value will apply to all addresses of an
3438 * association if the spp_address field is empty. Note
3439 * also, that if delayed sack is enabled and this
3440 * value is set to 0, no change is made to the last
3441 * recorded delayed sack timer value.
3443 * spp_flags - These flags are used to control various features
3444 * on an association. The flag field may contain
3445 * zero or more of the following options.
3447 * SPP_HB_ENABLE - Enable heartbeats on the
3448 * specified address. Note that if the address
3449 * field is empty all addresses for the association
3450 * have heartbeats enabled upon them.
3452 * SPP_HB_DISABLE - Disable heartbeats on the
3453 * speicifed address. Note that if the address
3454 * field is empty all addresses for the association
3455 * will have their heartbeats disabled. Note also
3456 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
3457 * mutually exclusive, only one of these two should
3458 * be specified. Enabling both fields will have
3459 * undetermined results.
3461 * SPP_HB_DEMAND - Request a user initiated heartbeat
3462 * to be made immediately.
3464 * SPP_PMTUD_ENABLE - This field will enable PMTU
3465 * discovery upon the specified address. Note that
3466 * if the address feild is empty then all addresses
3467 * on the association are effected.
3469 * SPP_PMTUD_DISABLE - This field will disable PMTU
3470 * discovery upon the specified address. Note that
3471 * if the address feild is empty then all addresses
3472 * on the association are effected. Not also that
3473 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
3474 * exclusive. Enabling both will have undetermined
3477 * SPP_SACKDELAY_ENABLE - Setting this flag turns
3478 * on delayed sack. The time specified in spp_sackdelay
3479 * is used to specify the sack delay for this address. Note
3480 * that if spp_address is empty then all addresses will
3481 * enable delayed sack and take on the sack delay
3482 * value specified in spp_sackdelay.
3483 * SPP_SACKDELAY_DISABLE - Setting this flag turns
3484 * off delayed sack. If the spp_address field is blank then
3485 * delayed sack is disabled for the entire association. Note
3486 * also that this field is mutually exclusive to
3487 * SPP_SACKDELAY_ENABLE, setting both will have undefined
3490 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
3491 char __user
*optval
, int __user
*optlen
)
3493 struct sctp_paddrparams params
;
3494 struct sctp_transport
*trans
= NULL
;
3495 struct sctp_association
*asoc
= NULL
;
3496 struct sctp_sock
*sp
= sctp_sk(sk
);
3498 if (len
!= sizeof(struct sctp_paddrparams
))
3501 if (copy_from_user(¶ms
, optval
, len
))
3504 /* If an address other than INADDR_ANY is specified, and
3505 * no transport is found, then the request is invalid.
3507 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
3508 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
3509 params
.spp_assoc_id
);
3511 SCTP_DEBUG_PRINTK("Failed no transport\n");
3516 /* Get association, if assoc_id != 0 and the socket is a one
3517 * to many style socket, and an association was not found, then
3518 * the id was invalid.
3520 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
3521 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
3522 SCTP_DEBUG_PRINTK("Failed no association\n");
3527 /* Fetch transport values. */
3528 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
3529 params
.spp_pathmtu
= trans
->pathmtu
;
3530 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
3531 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
3533 /*draft-11 doesn't say what to return in spp_flags*/
3534 params
.spp_flags
= trans
->param_flags
;
3536 /* Fetch association values. */
3537 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
3538 params
.spp_pathmtu
= asoc
->pathmtu
;
3539 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
3540 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
3542 /*draft-11 doesn't say what to return in spp_flags*/
3543 params
.spp_flags
= asoc
->param_flags
;
3545 /* Fetch socket values. */
3546 params
.spp_hbinterval
= sp
->hbinterval
;
3547 params
.spp_pathmtu
= sp
->pathmtu
;
3548 params
.spp_sackdelay
= sp
->sackdelay
;
3549 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
3551 /*draft-11 doesn't say what to return in spp_flags*/
3552 params
.spp_flags
= sp
->param_flags
;
3555 if (copy_to_user(optval
, ¶ms
, len
))
3558 if (put_user(len
, optlen
))
3564 /* 7.1.24. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
3566 * This options will get or set the delayed ack timer. The time is set
3567 * in milliseconds. If the assoc_id is 0, then this sets or gets the
3568 * endpoints default delayed ack timer value. If the assoc_id field is
3569 * non-zero, then the set or get effects the specified association.
3571 * struct sctp_assoc_value {
3572 * sctp_assoc_t assoc_id;
3573 * uint32_t assoc_value;
3576 * assoc_id - This parameter, indicates which association the
3577 * user is preforming an action upon. Note that if
3578 * this field's value is zero then the endpoints
3579 * default value is changed (effecting future
3580 * associations only).
3582 * assoc_value - This parameter contains the number of milliseconds
3583 * that the user is requesting the delayed ACK timer
3584 * be set to. Note that this value is defined in
3585 * the standard to be between 200 and 500 milliseconds.
3587 * Note: a value of zero will leave the value alone,
3588 * but disable SACK delay. A non-zero value will also
3589 * enable SACK delay.
3591 static int sctp_getsockopt_delayed_ack_time(struct sock
*sk
, int len
,
3592 char __user
*optval
,
3595 struct sctp_assoc_value params
;
3596 struct sctp_association
*asoc
= NULL
;
3597 struct sctp_sock
*sp
= sctp_sk(sk
);
3599 if (len
!= sizeof(struct sctp_assoc_value
))
3602 if (copy_from_user(¶ms
, optval
, len
))
3605 /* Get association, if assoc_id != 0 and the socket is a one
3606 * to many style socket, and an association was not found, then
3607 * the id was invalid.
3609 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3610 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
3614 /* Fetch association values. */
3615 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
)
3616 params
.assoc_value
= jiffies_to_msecs(
3619 params
.assoc_value
= 0;
3621 /* Fetch socket values. */
3622 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
)
3623 params
.assoc_value
= sp
->sackdelay
;
3625 params
.assoc_value
= 0;
3628 if (copy_to_user(optval
, ¶ms
, len
))
3631 if (put_user(len
, optlen
))
3637 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
3639 * Applications can specify protocol parameters for the default association
3640 * initialization. The option name argument to setsockopt() and getsockopt()
3643 * Setting initialization parameters is effective only on an unconnected
3644 * socket (for UDP-style sockets only future associations are effected
3645 * by the change). With TCP-style sockets, this option is inherited by
3646 * sockets derived from a listener socket.
3648 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3650 if (len
!= sizeof(struct sctp_initmsg
))
3652 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
3657 static int sctp_getsockopt_peer_addrs_num_old(struct sock
*sk
, int len
,
3658 char __user
*optval
,
3662 struct sctp_association
*asoc
;
3663 struct list_head
*pos
;
3666 if (len
!= sizeof(sctp_assoc_t
))
3669 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
3672 /* For UDP-style sockets, id specifies the association to query. */
3673 asoc
= sctp_id2assoc(sk
, id
);
3677 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3685 * Old API for getting list of peer addresses. Does not work for 32-bit
3686 * programs running on a 64-bit kernel
3688 static int sctp_getsockopt_peer_addrs_old(struct sock
*sk
, int len
,
3689 char __user
*optval
,
3692 struct sctp_association
*asoc
;
3693 struct list_head
*pos
;
3695 struct sctp_getaddrs_old getaddrs
;
3696 struct sctp_transport
*from
;
3698 union sctp_addr temp
;
3699 struct sctp_sock
*sp
= sctp_sk(sk
);
3702 if (len
!= sizeof(struct sctp_getaddrs_old
))
3705 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs_old
)))
3708 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
3710 /* For UDP-style sockets, id specifies the association to query. */
3711 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3715 to
= (void __user
*)getaddrs
.addrs
;
3716 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3717 from
= list_entry(pos
, struct sctp_transport
, transports
);
3718 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
3719 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3720 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3721 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3722 if (copy_to_user(to
, &temp
, addrlen
))
3726 if (cnt
>= getaddrs
.addr_num
) break;
3728 getaddrs
.addr_num
= cnt
;
3729 if (copy_to_user(optval
, &getaddrs
, sizeof(struct sctp_getaddrs_old
)))
3735 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
3736 char __user
*optval
, int __user
*optlen
)
3738 struct sctp_association
*asoc
;
3739 struct list_head
*pos
;
3741 struct sctp_getaddrs getaddrs
;
3742 struct sctp_transport
*from
;
3744 union sctp_addr temp
;
3745 struct sctp_sock
*sp
= sctp_sk(sk
);
3750 if (len
< sizeof(struct sctp_getaddrs
))
3753 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
3756 /* For UDP-style sockets, id specifies the association to query. */
3757 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3761 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
3762 space_left
= len
- sizeof(struct sctp_getaddrs
) -
3763 offsetof(struct sctp_getaddrs
,addrs
);
3765 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
3766 from
= list_entry(pos
, struct sctp_transport
, transports
);
3767 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
3768 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
3769 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
3770 if(space_left
< addrlen
)
3772 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
3773 if (copy_to_user(to
, &temp
, addrlen
))
3777 space_left
-= addrlen
;
3780 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
3782 bytes_copied
= ((char __user
*)to
) - optval
;
3783 if (put_user(bytes_copied
, optlen
))
3789 static int sctp_getsockopt_local_addrs_num_old(struct sock
*sk
, int len
,
3790 char __user
*optval
,
3794 struct sctp_bind_addr
*bp
;
3795 struct sctp_association
*asoc
;
3796 struct list_head
*pos
;
3797 struct sctp_sockaddr_entry
*addr
;
3798 rwlock_t
*addr_lock
;
3799 unsigned long flags
;
3802 if (len
!= sizeof(sctp_assoc_t
))
3805 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
3809 * For UDP-style sockets, id specifies the association to query.
3810 * If the id field is set to the value '0' then the locally bound
3811 * addresses are returned without regard to any particular
3815 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
3816 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
3818 asoc
= sctp_id2assoc(sk
, id
);
3821 bp
= &asoc
->base
.bind_addr
;
3822 addr_lock
= &asoc
->base
.addr_lock
;
3825 sctp_read_lock(addr_lock
);
3827 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
3828 * addresses from the global local address list.
3830 if (sctp_list_single_entry(&bp
->address_list
)) {
3831 addr
= list_entry(bp
->address_list
.next
,
3832 struct sctp_sockaddr_entry
, list
);
3833 if (sctp_is_any(&addr
->a
)) {
3834 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3835 list_for_each(pos
, &sctp_local_addr_list
) {
3836 addr
= list_entry(pos
,
3837 struct sctp_sockaddr_entry
,
3839 if ((PF_INET
== sk
->sk_family
) &&
3840 (AF_INET6
== addr
->a
.sa
.sa_family
))
3844 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3852 list_for_each(pos
, &bp
->address_list
) {
3857 sctp_read_unlock(addr_lock
);
3861 /* Helper function that copies local addresses to user and returns the number
3862 * of addresses copied.
3864 static int sctp_copy_laddrs_to_user_old(struct sock
*sk
, __u16 port
, int max_addrs
,
3867 struct list_head
*pos
;
3868 struct sctp_sockaddr_entry
*addr
;
3869 unsigned long flags
;
3870 union sctp_addr temp
;
3874 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3875 list_for_each(pos
, &sctp_local_addr_list
) {
3876 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3877 if ((PF_INET
== sk
->sk_family
) &&
3878 (AF_INET6
== addr
->a
.sa
.sa_family
))
3880 memcpy(&temp
, &addr
->a
, sizeof(temp
));
3881 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3883 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3884 temp
.v4
.sin_port
= htons(port
);
3885 if (copy_to_user(to
, &temp
, addrlen
)) {
3886 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3892 if (cnt
>= max_addrs
) break;
3894 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
3899 static int sctp_copy_laddrs_to_user(struct sock
*sk
, __u16 port
,
3900 void __user
**to
, size_t space_left
)
3902 struct list_head
*pos
;
3903 struct sctp_sockaddr_entry
*addr
;
3904 unsigned long flags
;
3905 union sctp_addr temp
;
3909 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
3910 list_for_each(pos
, &sctp_local_addr_list
) {
3911 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
3912 if ((PF_INET
== sk
->sk_family
) &&
3913 (AF_INET6
== addr
->a
.sa
.sa_family
))
3915 memcpy(&temp
, &addr
->a
, sizeof(temp
));
3916 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3918 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
3919 if(space_left
<addrlen
)
3921 temp
.v4
.sin_port
= htons(port
);
3922 if (copy_to_user(*to
, &temp
, addrlen
)) {
3923 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
,
3929 space_left
-= addrlen
;
3931 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
3936 /* Old API for getting list of local addresses. Does not work for 32-bit
3937 * programs running on a 64-bit kernel
3939 static int sctp_getsockopt_local_addrs_old(struct sock
*sk
, int len
,
3940 char __user
*optval
, int __user
*optlen
)
3942 struct sctp_bind_addr
*bp
;
3943 struct sctp_association
*asoc
;
3944 struct list_head
*pos
;
3946 struct sctp_getaddrs_old getaddrs
;
3947 struct sctp_sockaddr_entry
*addr
;
3949 union sctp_addr temp
;
3950 struct sctp_sock
*sp
= sctp_sk(sk
);
3952 rwlock_t
*addr_lock
;
3955 if (len
!= sizeof(struct sctp_getaddrs_old
))
3958 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs_old
)))
3961 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
3963 * For UDP-style sockets, id specifies the association to query.
3964 * If the id field is set to the value '0' then the locally bound
3965 * addresses are returned without regard to any particular
3968 if (0 == getaddrs
.assoc_id
) {
3969 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
3970 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
3972 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
3975 bp
= &asoc
->base
.bind_addr
;
3976 addr_lock
= &asoc
->base
.addr_lock
;
3979 to
= getaddrs
.addrs
;
3981 sctp_read_lock(addr_lock
);
3983 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
3984 * addresses from the global local address list.
3986 if (sctp_list_single_entry(&bp
->address_list
)) {
3987 addr
= list_entry(bp
->address_list
.next
,
3988 struct sctp_sockaddr_entry
, list
);
3989 if (sctp_is_any(&addr
->a
)) {
3990 cnt
= sctp_copy_laddrs_to_user_old(sk
, bp
->port
,
4001 list_for_each(pos
, &bp
->address_list
) {
4002 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4003 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4004 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4005 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4006 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
4007 if (copy_to_user(to
, &temp
, addrlen
)) {
4013 if (cnt
>= getaddrs
.addr_num
) break;
4017 getaddrs
.addr_num
= cnt
;
4018 if (copy_to_user(optval
, &getaddrs
, sizeof(struct sctp_getaddrs_old
)))
4022 sctp_read_unlock(addr_lock
);
4026 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4027 char __user
*optval
, int __user
*optlen
)
4029 struct sctp_bind_addr
*bp
;
4030 struct sctp_association
*asoc
;
4031 struct list_head
*pos
;
4033 struct sctp_getaddrs getaddrs
;
4034 struct sctp_sockaddr_entry
*addr
;
4036 union sctp_addr temp
;
4037 struct sctp_sock
*sp
= sctp_sk(sk
);
4039 rwlock_t
*addr_lock
;
4044 if (len
<= sizeof(struct sctp_getaddrs
))
4047 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4051 * For UDP-style sockets, id specifies the association to query.
4052 * If the id field is set to the value '0' then the locally bound
4053 * addresses are returned without regard to any particular
4056 if (0 == getaddrs
.assoc_id
) {
4057 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4058 addr_lock
= &sctp_sk(sk
)->ep
->base
.addr_lock
;
4060 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4063 bp
= &asoc
->base
.bind_addr
;
4064 addr_lock
= &asoc
->base
.addr_lock
;
4067 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4068 space_left
= len
- sizeof(struct sctp_getaddrs
) -
4069 offsetof(struct sctp_getaddrs
,addrs
);
4071 sctp_read_lock(addr_lock
);
4073 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4074 * addresses from the global local address list.
4076 if (sctp_list_single_entry(&bp
->address_list
)) {
4077 addr
= list_entry(bp
->address_list
.next
,
4078 struct sctp_sockaddr_entry
, list
);
4079 if (sctp_is_any(&addr
->a
)) {
4080 cnt
= sctp_copy_laddrs_to_user(sk
, bp
->port
,
4090 list_for_each(pos
, &bp
->address_list
) {
4091 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
4092 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4093 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4094 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4095 if(space_left
< addrlen
)
4096 return -ENOMEM
; /*fixme: right error?*/
4097 temp
.v4
.sin_port
= htons(temp
.v4
.sin_port
);
4098 if (copy_to_user(to
, &temp
, addrlen
)) {
4104 space_left
-= addrlen
;
4108 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4110 bytes_copied
= ((char __user
*)to
) - optval
;
4111 if (put_user(bytes_copied
, optlen
))
4115 sctp_read_unlock(addr_lock
);
4119 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4121 * Requests that the local SCTP stack use the enclosed peer address as
4122 * the association primary. The enclosed address must be one of the
4123 * association peer's addresses.
4125 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4126 char __user
*optval
, int __user
*optlen
)
4128 struct sctp_prim prim
;
4129 struct sctp_association
*asoc
;
4130 struct sctp_sock
*sp
= sctp_sk(sk
);
4132 if (len
!= sizeof(struct sctp_prim
))
4135 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
4138 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4142 if (!asoc
->peer
.primary_path
)
4145 asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
=
4146 htons(asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
);
4147 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4148 sizeof(union sctp_addr
));
4149 asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
=
4150 ntohs(asoc
->peer
.primary_path
->ipaddr
.v4
.sin_port
);
4152 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4153 (union sctp_addr
*)&prim
.ssp_addr
);
4155 if (copy_to_user(optval
, &prim
, sizeof(struct sctp_prim
)))
4162 * 7.1.11 Set Adaption Layer Indicator (SCTP_ADAPTION_LAYER)
4164 * Requests that the local endpoint set the specified Adaption Layer
4165 * Indication parameter for all future INIT and INIT-ACK exchanges.
4167 static int sctp_getsockopt_adaption_layer(struct sock
*sk
, int len
,
4168 char __user
*optval
, int __user
*optlen
)
4170 struct sctp_setadaption adaption
;
4172 if (len
!= sizeof(struct sctp_setadaption
))
4175 adaption
.ssb_adaption_ind
= sctp_sk(sk
)->adaption_ind
;
4176 if (copy_to_user(optval
, &adaption
, len
))
4184 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4186 * Applications that wish to use the sendto() system call may wish to
4187 * specify a default set of parameters that would normally be supplied
4188 * through the inclusion of ancillary data. This socket option allows
4189 * such an application to set the default sctp_sndrcvinfo structure.
4192 * The application that wishes to use this socket option simply passes
4193 * in to this call the sctp_sndrcvinfo structure defined in Section
4194 * 5.2.2) The input parameters accepted by this call include
4195 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4196 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4197 * to this call if the caller is using the UDP model.
4199 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4201 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4202 int len
, char __user
*optval
,
4205 struct sctp_sndrcvinfo info
;
4206 struct sctp_association
*asoc
;
4207 struct sctp_sock
*sp
= sctp_sk(sk
);
4209 if (len
!= sizeof(struct sctp_sndrcvinfo
))
4211 if (copy_from_user(&info
, optval
, sizeof(struct sctp_sndrcvinfo
)))
4214 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4215 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4219 info
.sinfo_stream
= asoc
->default_stream
;
4220 info
.sinfo_flags
= asoc
->default_flags
;
4221 info
.sinfo_ppid
= asoc
->default_ppid
;
4222 info
.sinfo_context
= asoc
->default_context
;
4223 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4225 info
.sinfo_stream
= sp
->default_stream
;
4226 info
.sinfo_flags
= sp
->default_flags
;
4227 info
.sinfo_ppid
= sp
->default_ppid
;
4228 info
.sinfo_context
= sp
->default_context
;
4229 info
.sinfo_timetolive
= sp
->default_timetolive
;
4232 if (copy_to_user(optval
, &info
, sizeof(struct sctp_sndrcvinfo
)))
4240 * 7.1.5 SCTP_NODELAY
4242 * Turn on/off any Nagle-like algorithm. This means that packets are
4243 * generally sent as soon as possible and no unnecessary delays are
4244 * introduced, at the cost of more packets in the network. Expects an
4245 * integer boolean flag.
4248 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4249 char __user
*optval
, int __user
*optlen
)
4253 if (len
< sizeof(int))
4257 val
= (sctp_sk(sk
)->nodelay
== 1);
4258 if (put_user(len
, optlen
))
4260 if (copy_to_user(optval
, &val
, len
))
4267 * 7.1.1 SCTP_RTOINFO
4269 * The protocol parameters used to initialize and bound retransmission
4270 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4271 * and modify these parameters.
4272 * All parameters are time values, in milliseconds. A value of 0, when
4273 * modifying the parameters, indicates that the current value should not
4277 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4278 char __user
*optval
,
4279 int __user
*optlen
) {
4280 struct sctp_rtoinfo rtoinfo
;
4281 struct sctp_association
*asoc
;
4283 if (len
!= sizeof (struct sctp_rtoinfo
))
4286 if (copy_from_user(&rtoinfo
, optval
, sizeof (struct sctp_rtoinfo
)))
4289 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4291 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4294 /* Values corresponding to the specific association. */
4296 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4297 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4298 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4300 /* Values corresponding to the endpoint. */
4301 struct sctp_sock
*sp
= sctp_sk(sk
);
4303 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4304 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4305 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4308 if (put_user(len
, optlen
))
4311 if (copy_to_user(optval
, &rtoinfo
, len
))
4319 * 7.1.2 SCTP_ASSOCINFO
4321 * This option is used to tune the the maximum retransmission attempts
4322 * of the association.
4323 * Returns an error if the new association retransmission value is
4324 * greater than the sum of the retransmission value of the peer.
4325 * See [SCTP] for more information.
4328 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4329 char __user
*optval
,
4333 struct sctp_assocparams assocparams
;
4334 struct sctp_association
*asoc
;
4335 struct list_head
*pos
;
4338 if (len
!= sizeof (struct sctp_assocparams
))
4341 if (copy_from_user(&assocparams
, optval
,
4342 sizeof (struct sctp_assocparams
)))
4345 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4347 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4350 /* Values correspoinding to the specific association */
4352 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4353 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4354 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4355 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4357 (asoc
->cookie_life
.tv_usec
4360 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4364 assocparams
.sasoc_number_peer_destinations
= cnt
;
4366 /* Values corresponding to the endpoint */
4367 struct sctp_sock
*sp
= sctp_sk(sk
);
4369 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4370 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4371 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4372 assocparams
.sasoc_cookie_life
=
4373 sp
->assocparams
.sasoc_cookie_life
;
4374 assocparams
.sasoc_number_peer_destinations
=
4376 sasoc_number_peer_destinations
;
4379 if (put_user(len
, optlen
))
4382 if (copy_to_user(optval
, &assocparams
, len
))
4389 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4391 * This socket option is a boolean flag which turns on or off mapped V4
4392 * addresses. If this option is turned on and the socket is type
4393 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4394 * If this option is turned off, then no mapping will be done of V4
4395 * addresses and a user will receive both PF_INET6 and PF_INET type
4396 * addresses on the socket.
4398 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
4399 char __user
*optval
, int __user
*optlen
)
4402 struct sctp_sock
*sp
= sctp_sk(sk
);
4404 if (len
< sizeof(int))
4409 if (put_user(len
, optlen
))
4411 if (copy_to_user(optval
, &val
, len
))
4418 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
4420 * This socket option specifies the maximum size to put in any outgoing
4421 * SCTP chunk. If a message is larger than this size it will be
4422 * fragmented by SCTP into the specified size. Note that the underlying
4423 * SCTP implementation may fragment into smaller sized chunks when the
4424 * PMTU of the underlying association is smaller than the value set by
4427 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
4428 char __user
*optval
, int __user
*optlen
)
4432 if (len
< sizeof(int))
4437 val
= sctp_sk(sk
)->user_frag
;
4438 if (put_user(len
, optlen
))
4440 if (copy_to_user(optval
, &val
, len
))
4446 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
4447 char __user
*optval
, int __user
*optlen
)
4452 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
4455 /* I can hardly begin to describe how wrong this is. This is
4456 * so broken as to be worse than useless. The API draft
4457 * REALLY is NOT helpful here... I am not convinced that the
4458 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
4459 * are at all well-founded.
4461 if (level
!= SOL_SCTP
) {
4462 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
4464 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
4468 if (get_user(len
, optlen
))
4475 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
4477 case SCTP_DISABLE_FRAGMENTS
:
4478 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
4482 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
4484 case SCTP_AUTOCLOSE
:
4485 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
4487 case SCTP_SOCKOPT_PEELOFF
:
4488 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
4490 case SCTP_PEER_ADDR_PARAMS
:
4491 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
4494 case SCTP_DELAYED_ACK_TIME
:
4495 retval
= sctp_getsockopt_delayed_ack_time(sk
, len
, optval
,
4499 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
4501 case SCTP_GET_PEER_ADDRS_NUM_OLD
:
4502 retval
= sctp_getsockopt_peer_addrs_num_old(sk
, len
, optval
,
4505 case SCTP_GET_LOCAL_ADDRS_NUM_OLD
:
4506 retval
= sctp_getsockopt_local_addrs_num_old(sk
, len
, optval
,
4509 case SCTP_GET_PEER_ADDRS_OLD
:
4510 retval
= sctp_getsockopt_peer_addrs_old(sk
, len
, optval
,
4513 case SCTP_GET_LOCAL_ADDRS_OLD
:
4514 retval
= sctp_getsockopt_local_addrs_old(sk
, len
, optval
,
4517 case SCTP_GET_PEER_ADDRS
:
4518 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
4521 case SCTP_GET_LOCAL_ADDRS
:
4522 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
4525 case SCTP_DEFAULT_SEND_PARAM
:
4526 retval
= sctp_getsockopt_default_send_param(sk
, len
,
4529 case SCTP_PRIMARY_ADDR
:
4530 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
4533 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
4536 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
4538 case SCTP_ASSOCINFO
:
4539 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
4541 case SCTP_I_WANT_MAPPED_V4_ADDR
:
4542 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
4545 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
4547 case SCTP_GET_PEER_ADDR_INFO
:
4548 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
4551 case SCTP_ADAPTION_LAYER
:
4552 retval
= sctp_getsockopt_adaption_layer(sk
, len
, optval
,
4556 retval
= -ENOPROTOOPT
;
4560 sctp_release_sock(sk
);
4564 static void sctp_hash(struct sock
*sk
)
4569 static void sctp_unhash(struct sock
*sk
)
4574 /* Check if port is acceptable. Possibly find first available port.
4576 * The port hash table (contained in the 'global' SCTP protocol storage
4577 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
4578 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
4579 * list (the list number is the port number hashed out, so as you
4580 * would expect from a hash function, all the ports in a given list have
4581 * such a number that hashes out to the same list number; you were
4582 * expecting that, right?); so each list has a set of ports, with a
4583 * link to the socket (struct sock) that uses it, the port number and
4584 * a fastreuse flag (FIXME: NPI ipg).
4586 static struct sctp_bind_bucket
*sctp_bucket_create(
4587 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
4589 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
4591 struct sctp_bind_hashbucket
*head
; /* hash list */
4592 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
4593 unsigned short snum
;
4596 /* NOTE: Remember to put this back to net order. */
4597 addr
->v4
.sin_port
= ntohs(addr
->v4
.sin_port
);
4598 snum
= addr
->v4
.sin_port
;
4600 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
4601 sctp_local_bh_disable();
4604 /* Search for an available port.
4606 * 'sctp_port_rover' was the last port assigned, so
4607 * we start to search from 'sctp_port_rover +
4608 * 1'. What we do is first check if port 'rover' is
4609 * already in the hash table; if not, we use that; if
4610 * it is, we try next.
4612 int low
= sysctl_local_port_range
[0];
4613 int high
= sysctl_local_port_range
[1];
4614 int remaining
= (high
- low
) + 1;
4618 sctp_spin_lock(&sctp_port_alloc_lock
);
4619 rover
= sctp_port_rover
;
4622 if ((rover
< low
) || (rover
> high
))
4624 index
= sctp_phashfn(rover
);
4625 head
= &sctp_port_hashtable
[index
];
4626 sctp_spin_lock(&head
->lock
);
4627 for (pp
= head
->chain
; pp
; pp
= pp
->next
)
4628 if (pp
->port
== rover
)
4632 sctp_spin_unlock(&head
->lock
);
4633 } while (--remaining
> 0);
4634 sctp_port_rover
= rover
;
4635 sctp_spin_unlock(&sctp_port_alloc_lock
);
4637 /* Exhausted local port range during search? */
4642 /* OK, here is the one we will use. HEAD (the port
4643 * hash table list entry) is non-NULL and we hold it's
4648 /* We are given an specific port number; we verify
4649 * that it is not being used. If it is used, we will
4650 * exahust the search in the hash list corresponding
4651 * to the port number (snum) - we detect that with the
4652 * port iterator, pp being NULL.
4654 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
4655 sctp_spin_lock(&head
->lock
);
4656 for (pp
= head
->chain
; pp
; pp
= pp
->next
) {
4657 if (pp
->port
== snum
)
4664 if (!hlist_empty(&pp
->owner
)) {
4665 /* We had a port hash table hit - there is an
4666 * available port (pp != NULL) and it is being
4667 * used by other socket (pp->owner not empty); that other
4668 * socket is going to be sk2.
4670 int reuse
= sk
->sk_reuse
;
4672 struct hlist_node
*node
;
4674 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
4675 if (pp
->fastreuse
&& sk
->sk_reuse
)
4678 /* Run through the list of sockets bound to the port
4679 * (pp->port) [via the pointers bind_next and
4680 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
4681 * we get the endpoint they describe and run through
4682 * the endpoint's list of IP (v4 or v6) addresses,
4683 * comparing each of the addresses with the address of
4684 * the socket sk. If we find a match, then that means
4685 * that this port/socket (sk) combination are already
4688 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
4689 struct sctp_endpoint
*ep2
;
4690 ep2
= sctp_sk(sk2
)->ep
;
4692 if (reuse
&& sk2
->sk_reuse
)
4695 if (sctp_bind_addr_match(&ep2
->base
.bind_addr
, addr
,
4701 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
4704 /* If there was a hash table miss, create a new port. */
4706 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
4709 /* In either case (hit or miss), make sure fastreuse is 1 only
4710 * if sk->sk_reuse is too (that is, if the caller requested
4711 * SO_REUSEADDR on this socket -sk-).
4713 if (hlist_empty(&pp
->owner
))
4714 pp
->fastreuse
= sk
->sk_reuse
? 1 : 0;
4715 else if (pp
->fastreuse
&& !sk
->sk_reuse
)
4718 /* We are set, so fill up all the data in the hash table
4719 * entry, tie the socket list information with the rest of the
4720 * sockets FIXME: Blurry, NPI (ipg).
4723 inet_sk(sk
)->num
= snum
;
4724 if (!sctp_sk(sk
)->bind_hash
) {
4725 sk_add_bind_node(sk
, &pp
->owner
);
4726 sctp_sk(sk
)->bind_hash
= pp
;
4731 sctp_spin_unlock(&head
->lock
);
4734 sctp_local_bh_enable();
4735 addr
->v4
.sin_port
= htons(addr
->v4
.sin_port
);
4739 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
4740 * port is requested.
4742 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
4745 union sctp_addr addr
;
4746 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
4748 /* Set up a dummy address struct from the sk. */
4749 af
->from_sk(&addr
, sk
);
4750 addr
.v4
.sin_port
= htons(snum
);
4752 /* Note: sk->sk_num gets filled in if ephemeral port request. */
4753 ret
= sctp_get_port_local(sk
, &addr
);
4755 return (ret
? 1 : 0);
4759 * 3.1.3 listen() - UDP Style Syntax
4761 * By default, new associations are not accepted for UDP style sockets.
4762 * An application uses listen() to mark a socket as being able to
4763 * accept new associations.
4765 SCTP_STATIC
int sctp_seqpacket_listen(struct sock
*sk
, int backlog
)
4767 struct sctp_sock
*sp
= sctp_sk(sk
);
4768 struct sctp_endpoint
*ep
= sp
->ep
;
4770 /* Only UDP style sockets that are not peeled off are allowed to
4773 if (!sctp_style(sk
, UDP
))
4776 /* If backlog is zero, disable listening. */
4778 if (sctp_sstate(sk
, CLOSED
))
4781 sctp_unhash_endpoint(ep
);
4782 sk
->sk_state
= SCTP_SS_CLOSED
;
4785 /* Return if we are already listening. */
4786 if (sctp_sstate(sk
, LISTENING
))
4790 * If a bind() or sctp_bindx() is not called prior to a listen()
4791 * call that allows new associations to be accepted, the system
4792 * picks an ephemeral port and will choose an address set equivalent
4793 * to binding with a wildcard address.
4795 * This is not currently spelled out in the SCTP sockets
4796 * extensions draft, but follows the practice as seen in TCP
4799 if (!ep
->base
.bind_addr
.port
) {
4800 if (sctp_autobind(sk
))
4803 sk
->sk_state
= SCTP_SS_LISTENING
;
4804 sctp_hash_endpoint(ep
);
4809 * 4.1.3 listen() - TCP Style Syntax
4811 * Applications uses listen() to ready the SCTP endpoint for accepting
4812 * inbound associations.
4814 SCTP_STATIC
int sctp_stream_listen(struct sock
*sk
, int backlog
)
4816 struct sctp_sock
*sp
= sctp_sk(sk
);
4817 struct sctp_endpoint
*ep
= sp
->ep
;
4819 /* If backlog is zero, disable listening. */
4821 if (sctp_sstate(sk
, CLOSED
))
4824 sctp_unhash_endpoint(ep
);
4825 sk
->sk_state
= SCTP_SS_CLOSED
;
4828 if (sctp_sstate(sk
, LISTENING
))
4832 * If a bind() or sctp_bindx() is not called prior to a listen()
4833 * call that allows new associations to be accepted, the system
4834 * picks an ephemeral port and will choose an address set equivalent
4835 * to binding with a wildcard address.
4837 * This is not currently spelled out in the SCTP sockets
4838 * extensions draft, but follows the practice as seen in TCP
4841 if (!ep
->base
.bind_addr
.port
) {
4842 if (sctp_autobind(sk
))
4845 sk
->sk_state
= SCTP_SS_LISTENING
;
4846 sk
->sk_max_ack_backlog
= backlog
;
4847 sctp_hash_endpoint(ep
);
4852 * Move a socket to LISTENING state.
4854 int sctp_inet_listen(struct socket
*sock
, int backlog
)
4856 struct sock
*sk
= sock
->sk
;
4857 struct crypto_tfm
*tfm
=NULL
;
4860 if (unlikely(backlog
< 0))
4865 if (sock
->state
!= SS_UNCONNECTED
)
4868 /* Allocate HMAC for generating cookie. */
4869 if (sctp_hmac_alg
) {
4870 tfm
= sctp_crypto_alloc_tfm(sctp_hmac_alg
, 0);
4877 switch (sock
->type
) {
4878 case SOCK_SEQPACKET
:
4879 err
= sctp_seqpacket_listen(sk
, backlog
);
4882 err
= sctp_stream_listen(sk
, backlog
);
4890 /* Store away the transform reference. */
4891 sctp_sk(sk
)->hmac
= tfm
;
4893 sctp_release_sock(sk
);
4896 sctp_crypto_free_tfm(tfm
);
4901 * This function is done by modeling the current datagram_poll() and the
4902 * tcp_poll(). Note that, based on these implementations, we don't
4903 * lock the socket in this function, even though it seems that,
4904 * ideally, locking or some other mechanisms can be used to ensure
4905 * the integrity of the counters (sndbuf and wmem_alloc) used
4906 * in this place. We assume that we don't need locks either until proven
4909 * Another thing to note is that we include the Async I/O support
4910 * here, again, by modeling the current TCP/UDP code. We don't have
4911 * a good way to test with it yet.
4913 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
4915 struct sock
*sk
= sock
->sk
;
4916 struct sctp_sock
*sp
= sctp_sk(sk
);
4919 poll_wait(file
, sk
->sk_sleep
, wait
);
4921 /* A TCP-style listening socket becomes readable when the accept queue
4924 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
4925 return (!list_empty(&sp
->ep
->asocs
)) ?
4926 (POLLIN
| POLLRDNORM
) : 0;
4930 /* Is there any exceptional events? */
4931 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
4933 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
4936 /* Is it readable? Reconsider this code with TCP-style support. */
4937 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
4938 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
4939 mask
|= POLLIN
| POLLRDNORM
;
4941 /* The association is either gone or not ready. */
4942 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
4945 /* Is it writable? */
4946 if (sctp_writeable(sk
)) {
4947 mask
|= POLLOUT
| POLLWRNORM
;
4949 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
4951 * Since the socket is not locked, the buffer
4952 * might be made available after the writeable check and
4953 * before the bit is set. This could cause a lost I/O
4954 * signal. tcp_poll() has a race breaker for this race
4955 * condition. Based on their implementation, we put
4956 * in the following code to cover it as well.
4958 if (sctp_writeable(sk
))
4959 mask
|= POLLOUT
| POLLWRNORM
;
4964 /********************************************************************
4965 * 2nd Level Abstractions
4966 ********************************************************************/
4968 static struct sctp_bind_bucket
*sctp_bucket_create(
4969 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
4971 struct sctp_bind_bucket
*pp
;
4973 pp
= kmem_cache_alloc(sctp_bucket_cachep
, SLAB_ATOMIC
);
4974 SCTP_DBG_OBJCNT_INC(bind_bucket
);
4978 INIT_HLIST_HEAD(&pp
->owner
);
4979 if ((pp
->next
= head
->chain
) != NULL
)
4980 pp
->next
->pprev
= &pp
->next
;
4982 pp
->pprev
= &head
->chain
;
4987 /* Caller must hold hashbucket lock for this tb with local BH disabled */
4988 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
4990 if (hlist_empty(&pp
->owner
)) {
4992 pp
->next
->pprev
= pp
->pprev
;
4993 *(pp
->pprev
) = pp
->next
;
4994 kmem_cache_free(sctp_bucket_cachep
, pp
);
4995 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
4999 /* Release this socket's reference to a local port. */
5000 static inline void __sctp_put_port(struct sock
*sk
)
5002 struct sctp_bind_hashbucket
*head
=
5003 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->num
)];
5004 struct sctp_bind_bucket
*pp
;
5006 sctp_spin_lock(&head
->lock
);
5007 pp
= sctp_sk(sk
)->bind_hash
;
5008 __sk_del_bind_node(sk
);
5009 sctp_sk(sk
)->bind_hash
= NULL
;
5010 inet_sk(sk
)->num
= 0;
5011 sctp_bucket_destroy(pp
);
5012 sctp_spin_unlock(&head
->lock
);
5015 void sctp_put_port(struct sock
*sk
)
5017 sctp_local_bh_disable();
5018 __sctp_put_port(sk
);
5019 sctp_local_bh_enable();
5023 * The system picks an ephemeral port and choose an address set equivalent
5024 * to binding with a wildcard address.
5025 * One of those addresses will be the primary address for the association.
5026 * This automatically enables the multihoming capability of SCTP.
5028 static int sctp_autobind(struct sock
*sk
)
5030 union sctp_addr autoaddr
;
5032 unsigned short port
;
5034 /* Initialize a local sockaddr structure to INADDR_ANY. */
5035 af
= sctp_sk(sk
)->pf
->af
;
5037 port
= htons(inet_sk(sk
)->num
);
5038 af
->inaddr_any(&autoaddr
, port
);
5040 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5043 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5046 * 4.2 The cmsghdr Structure *
5048 * When ancillary data is sent or received, any number of ancillary data
5049 * objects can be specified by the msg_control and msg_controllen members of
5050 * the msghdr structure, because each object is preceded by
5051 * a cmsghdr structure defining the object's length (the cmsg_len member).
5052 * Historically Berkeley-derived implementations have passed only one object
5053 * at a time, but this API allows multiple objects to be
5054 * passed in a single call to sendmsg() or recvmsg(). The following example
5055 * shows two ancillary data objects in a control buffer.
5057 * |<--------------------------- msg_controllen -------------------------->|
5060 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5062 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5065 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5067 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5070 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5071 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5073 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5075 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5082 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
5083 sctp_cmsgs_t
*cmsgs
)
5085 struct cmsghdr
*cmsg
;
5087 for (cmsg
= CMSG_FIRSTHDR(msg
);
5089 cmsg
= CMSG_NXTHDR((struct msghdr
*)msg
, cmsg
)) {
5090 if (!CMSG_OK(msg
, cmsg
))
5093 /* Should we parse this header or ignore? */
5094 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
5097 /* Strictly check lengths following example in SCM code. */
5098 switch (cmsg
->cmsg_type
) {
5100 /* SCTP Socket API Extension
5101 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5103 * This cmsghdr structure provides information for
5104 * initializing new SCTP associations with sendmsg().
5105 * The SCTP_INITMSG socket option uses this same data
5106 * structure. This structure is not used for
5109 * cmsg_level cmsg_type cmsg_data[]
5110 * ------------ ------------ ----------------------
5111 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5113 if (cmsg
->cmsg_len
!=
5114 CMSG_LEN(sizeof(struct sctp_initmsg
)))
5116 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
5120 /* SCTP Socket API Extension
5121 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5123 * This cmsghdr structure specifies SCTP options for
5124 * sendmsg() and describes SCTP header information
5125 * about a received message through recvmsg().
5127 * cmsg_level cmsg_type cmsg_data[]
5128 * ------------ ------------ ----------------------
5129 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5131 if (cmsg
->cmsg_len
!=
5132 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
5136 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
5138 /* Minimally, validate the sinfo_flags. */
5139 if (cmsgs
->info
->sinfo_flags
&
5140 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
5141 SCTP_ABORT
| SCTP_EOF
))
5153 * Wait for a packet..
5154 * Note: This function is the same function as in core/datagram.c
5155 * with a few modifications to make lksctp work.
5157 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
5162 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5164 /* Socket errors? */
5165 error
= sock_error(sk
);
5169 if (!skb_queue_empty(&sk
->sk_receive_queue
))
5172 /* Socket shut down? */
5173 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5176 /* Sequenced packets can come disconnected. If so we report the
5181 /* Is there a good reason to think that we may receive some data? */
5182 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
5185 /* Handle signals. */
5186 if (signal_pending(current
))
5189 /* Let another process have a go. Since we are going to sleep
5190 * anyway. Note: This may cause odd behaviors if the message
5191 * does not fit in the user's buffer, but this seems to be the
5192 * only way to honor MSG_DONTWAIT realistically.
5194 sctp_release_sock(sk
);
5195 *timeo_p
= schedule_timeout(*timeo_p
);
5199 finish_wait(sk
->sk_sleep
, &wait
);
5203 error
= sock_intr_errno(*timeo_p
);
5206 finish_wait(sk
->sk_sleep
, &wait
);
5211 /* Receive a datagram.
5212 * Note: This is pretty much the same routine as in core/datagram.c
5213 * with a few changes to make lksctp work.
5215 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
5216 int noblock
, int *err
)
5219 struct sk_buff
*skb
;
5222 timeo
= sock_rcvtimeo(sk
, noblock
);
5224 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
5225 timeo
, MAX_SCHEDULE_TIMEOUT
);
5228 /* Again only user level code calls this function,
5229 * so nothing interrupt level
5230 * will suddenly eat the receive_queue.
5232 * Look at current nfs client by the way...
5233 * However, this function was corrent in any case. 8)
5235 if (flags
& MSG_PEEK
) {
5236 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
5237 skb
= skb_peek(&sk
->sk_receive_queue
);
5239 atomic_inc(&skb
->users
);
5240 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
5242 skb
= skb_dequeue(&sk
->sk_receive_queue
);
5248 /* Caller is allowed not to check sk->sk_err before calling. */
5249 error
= sock_error(sk
);
5253 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5256 /* User doesn't want to wait. */
5260 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
5269 /* If sndbuf has changed, wake up per association sndbuf waiters. */
5270 static void __sctp_write_space(struct sctp_association
*asoc
)
5272 struct sock
*sk
= asoc
->base
.sk
;
5273 struct socket
*sock
= sk
->sk_socket
;
5275 if ((sctp_wspace(asoc
) > 0) && sock
) {
5276 if (waitqueue_active(&asoc
->wait
))
5277 wake_up_interruptible(&asoc
->wait
);
5279 if (sctp_writeable(sk
)) {
5280 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
5281 wake_up_interruptible(sk
->sk_sleep
);
5283 /* Note that we try to include the Async I/O support
5284 * here by modeling from the current TCP/UDP code.
5285 * We have not tested with it yet.
5287 if (sock
->fasync_list
&&
5288 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
5289 sock_wake_async(sock
, 2, POLL_OUT
);
5294 /* Do accounting for the sndbuf space.
5295 * Decrement the used sndbuf space of the corresponding association by the
5296 * data size which was just transmitted(freed).
5298 static void sctp_wfree(struct sk_buff
*skb
)
5300 struct sctp_association
*asoc
;
5301 struct sctp_chunk
*chunk
;
5304 /* Get the saved chunk pointer. */
5305 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
5308 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
5309 sizeof(struct sk_buff
) +
5310 sizeof(struct sctp_chunk
);
5312 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
5315 __sctp_write_space(asoc
);
5317 sctp_association_put(asoc
);
5320 /* Helper function to wait for space in the sndbuf. */
5321 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
5324 struct sock
*sk
= asoc
->base
.sk
;
5326 long current_timeo
= *timeo_p
;
5329 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
5330 asoc
, (long)(*timeo_p
), msg_len
);
5332 /* Increment the association's refcnt. */
5333 sctp_association_hold(asoc
);
5335 /* Wait on the association specific sndbuf space. */
5337 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
5338 TASK_INTERRUPTIBLE
);
5341 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
5344 if (signal_pending(current
))
5345 goto do_interrupted
;
5346 if (msg_len
<= sctp_wspace(asoc
))
5349 /* Let another process have a go. Since we are going
5352 sctp_release_sock(sk
);
5353 current_timeo
= schedule_timeout(current_timeo
);
5356 *timeo_p
= current_timeo
;
5360 finish_wait(&asoc
->wait
, &wait
);
5362 /* Release the association's refcnt. */
5363 sctp_association_put(asoc
);
5372 err
= sock_intr_errno(*timeo_p
);
5380 /* If socket sndbuf has changed, wake up all per association waiters. */
5381 void sctp_write_space(struct sock
*sk
)
5383 struct sctp_association
*asoc
;
5384 struct list_head
*pos
;
5386 /* Wake up the tasks in each wait queue. */
5387 list_for_each(pos
, &((sctp_sk(sk
))->ep
->asocs
)) {
5388 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
5389 __sctp_write_space(asoc
);
5393 /* Is there any sndbuf space available on the socket?
5395 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
5396 * associations on the same socket. For a UDP-style socket with
5397 * multiple associations, it is possible for it to be "unwriteable"
5398 * prematurely. I assume that this is acceptable because
5399 * a premature "unwriteable" is better than an accidental "writeable" which
5400 * would cause an unwanted block under certain circumstances. For the 1-1
5401 * UDP-style sockets or TCP-style sockets, this code should work.
5404 static int sctp_writeable(struct sock
*sk
)
5408 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
5414 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
5415 * returns immediately with EINPROGRESS.
5417 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
5419 struct sock
*sk
= asoc
->base
.sk
;
5421 long current_timeo
= *timeo_p
;
5424 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __FUNCTION__
, asoc
,
5427 /* Increment the association's refcnt. */
5428 sctp_association_hold(asoc
);
5431 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
5432 TASK_INTERRUPTIBLE
);
5435 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5437 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
5440 if (signal_pending(current
))
5441 goto do_interrupted
;
5443 if (sctp_state(asoc
, ESTABLISHED
))
5446 /* Let another process have a go. Since we are going
5449 sctp_release_sock(sk
);
5450 current_timeo
= schedule_timeout(current_timeo
);
5453 *timeo_p
= current_timeo
;
5457 finish_wait(&asoc
->wait
, &wait
);
5459 /* Release the association's refcnt. */
5460 sctp_association_put(asoc
);
5465 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
5468 err
= -ECONNREFUSED
;
5472 err
= sock_intr_errno(*timeo_p
);
5480 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
5482 struct sctp_endpoint
*ep
;
5486 ep
= sctp_sk(sk
)->ep
;
5490 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
,
5491 TASK_INTERRUPTIBLE
);
5493 if (list_empty(&ep
->asocs
)) {
5494 sctp_release_sock(sk
);
5495 timeo
= schedule_timeout(timeo
);
5500 if (!sctp_sstate(sk
, LISTENING
))
5504 if (!list_empty(&ep
->asocs
))
5507 err
= sock_intr_errno(timeo
);
5508 if (signal_pending(current
))
5516 finish_wait(sk
->sk_sleep
, &wait
);
5521 void sctp_wait_for_close(struct sock
*sk
, long timeout
)
5526 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5527 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
5529 sctp_release_sock(sk
);
5530 timeout
= schedule_timeout(timeout
);
5532 } while (!signal_pending(current
) && timeout
);
5534 finish_wait(sk
->sk_sleep
, &wait
);
5537 /* Populate the fields of the newsk from the oldsk and migrate the assoc
5538 * and its messages to the newsk.
5540 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
5541 struct sctp_association
*assoc
,
5542 sctp_socket_type_t type
)
5544 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
5545 struct sctp_sock
*newsp
= sctp_sk(newsk
);
5546 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5547 struct sctp_endpoint
*newep
= newsp
->ep
;
5548 struct sk_buff
*skb
, *tmp
;
5549 struct sctp_ulpevent
*event
;
5552 /* Migrate socket buffer sizes and all the socket level options to the
5555 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
5556 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
5557 /* Brute force copy old sctp opt. */
5558 inet_sk_copy_descendant(newsk
, oldsk
);
5560 /* Restore the ep value that was overwritten with the above structure
5566 /* Hook this new socket in to the bind_hash list. */
5567 pp
= sctp_sk(oldsk
)->bind_hash
;
5568 sk_add_bind_node(newsk
, &pp
->owner
);
5569 sctp_sk(newsk
)->bind_hash
= pp
;
5570 inet_sk(newsk
)->num
= inet_sk(oldsk
)->num
;
5572 /* Copy the bind_addr list from the original endpoint to the new
5573 * endpoint so that we can handle restarts properly
5575 if (assoc
->peer
.ipv4_address
)
5576 flags
|= SCTP_ADDR4_PEERSUPP
;
5577 if (assoc
->peer
.ipv6_address
)
5578 flags
|= SCTP_ADDR6_PEERSUPP
;
5579 sctp_bind_addr_copy(&newsp
->ep
->base
.bind_addr
,
5580 &oldsp
->ep
->base
.bind_addr
,
5581 SCTP_SCOPE_GLOBAL
, GFP_KERNEL
, flags
);
5583 /* Move any messages in the old socket's receive queue that are for the
5584 * peeled off association to the new socket's receive queue.
5586 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
5587 event
= sctp_skb2event(skb
);
5588 if (event
->asoc
== assoc
) {
5590 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
5591 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
5592 skb_set_owner_r(skb
, newsk
);
5596 /* Clean up any messages pending delivery due to partial
5597 * delivery. Three cases:
5598 * 1) No partial deliver; no work.
5599 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
5600 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
5602 skb_queue_head_init(&newsp
->pd_lobby
);
5603 sctp_sk(newsk
)->pd_mode
= assoc
->ulpq
.pd_mode
;
5605 if (sctp_sk(oldsk
)->pd_mode
) {
5606 struct sk_buff_head
*queue
;
5608 /* Decide which queue to move pd_lobby skbs to. */
5609 if (assoc
->ulpq
.pd_mode
) {
5610 queue
= &newsp
->pd_lobby
;
5612 queue
= &newsk
->sk_receive_queue
;
5614 /* Walk through the pd_lobby, looking for skbs that
5615 * need moved to the new socket.
5617 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
5618 event
= sctp_skb2event(skb
);
5619 if (event
->asoc
== assoc
) {
5621 __skb_unlink(skb
, &oldsp
->pd_lobby
);
5622 __skb_queue_tail(queue
, skb
);
5623 skb_set_owner_r(skb
, newsk
);
5627 /* Clear up any skbs waiting for the partial
5628 * delivery to finish.
5630 if (assoc
->ulpq
.pd_mode
)
5631 sctp_clear_pd(oldsk
);
5635 /* Set the type of socket to indicate that it is peeled off from the
5636 * original UDP-style socket or created with the accept() call on a
5637 * TCP-style socket..
5641 spin_lock_bh(&oldsk
->sk_lock
.slock
);
5642 /* Migrate the backlog from oldsk to newsk. */
5643 sctp_backlog_migrate(assoc
, oldsk
, newsk
);
5644 /* Migrate the association to the new socket. */
5645 sctp_assoc_migrate(assoc
, newsk
);
5646 spin_unlock_bh(&oldsk
->sk_lock
.slock
);
5648 /* If the association on the newsk is already closed before accept()
5649 * is called, set RCV_SHUTDOWN flag.
5651 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
5652 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
5654 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
5657 /* This proto struct describes the ULP interface for SCTP. */
5658 struct proto sctp_prot
= {
5660 .owner
= THIS_MODULE
,
5661 .close
= sctp_close
,
5662 .connect
= sctp_connect
,
5663 .disconnect
= sctp_disconnect
,
5664 .accept
= sctp_accept
,
5665 .ioctl
= sctp_ioctl
,
5666 .init
= sctp_init_sock
,
5667 .destroy
= sctp_destroy_sock
,
5668 .shutdown
= sctp_shutdown
,
5669 .setsockopt
= sctp_setsockopt
,
5670 .getsockopt
= sctp_getsockopt
,
5671 .sendmsg
= sctp_sendmsg
,
5672 .recvmsg
= sctp_recvmsg
,
5674 .backlog_rcv
= sctp_backlog_rcv
,
5676 .unhash
= sctp_unhash
,
5677 .get_port
= sctp_get_port
,
5678 .obj_size
= sizeof(struct sctp_sock
),
5681 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5682 struct proto sctpv6_prot
= {
5684 .owner
= THIS_MODULE
,
5685 .close
= sctp_close
,
5686 .connect
= sctp_connect
,
5687 .disconnect
= sctp_disconnect
,
5688 .accept
= sctp_accept
,
5689 .ioctl
= sctp_ioctl
,
5690 .init
= sctp_init_sock
,
5691 .destroy
= sctp_destroy_sock
,
5692 .shutdown
= sctp_shutdown
,
5693 .setsockopt
= sctp_setsockopt
,
5694 .getsockopt
= sctp_getsockopt
,
5695 .sendmsg
= sctp_sendmsg
,
5696 .recvmsg
= sctp_recvmsg
,
5698 .backlog_rcv
= sctp_backlog_rcv
,
5700 .unhash
= sctp_unhash
,
5701 .get_port
= sctp_get_port
,
5702 .obj_size
= sizeof(struct sctp6_sock
),
5704 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */