1 /* SCTP kernel 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 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 * This SCTP 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 * This SCTP implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, write to
32 * the Free Software Foundation, 59 Temple Place - Suite 330,
33 * Boston, MA 02111-1307, USA.
35 * Please send any bug reports or fixes you make to the
37 * lksctp developers <lksctp-developers@lists.sourceforge.net>
39 * Or submit a bug report through the following website:
40 * http://www.sf.net/projects/lksctp
42 * Written or modified by:
43 * La Monte H.P. Yarroll <piggy@acm.org>
44 * Narasimha Budihal <narsi@refcode.org>
45 * Karl Knutson <karl@athena.chicago.il.us>
46 * Jon Grimm <jgrimm@us.ibm.com>
47 * Xingang Guo <xingang.guo@intel.com>
48 * Daisy Chang <daisyc@us.ibm.com>
49 * Sridhar Samudrala <samudrala@us.ibm.com>
50 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
51 * Ardelle Fan <ardelle.fan@intel.com>
52 * Ryan Layer <rmlayer@us.ibm.com>
53 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
54 * Kevin Gao <kevin.gao@intel.com>
56 * Any bugs reported given to us we will try to fix... any fixes shared will
57 * be incorporated into the next SCTP release.
60 #include <linux/types.h>
61 #include <linux/kernel.h>
62 #include <linux/wait.h>
63 #include <linux/time.h>
65 #include <linux/capability.h>
66 #include <linux/fcntl.h>
67 #include <linux/poll.h>
68 #include <linux/init.h>
69 #include <linux/crypto.h>
73 #include <net/route.h>
75 #include <net/inet_common.h>
77 #include <linux/socket.h> /* for sa_family_t */
79 #include <net/sctp/sctp.h>
80 #include <net/sctp/sm.h>
82 /* WARNING: Please do not remove the SCTP_STATIC attribute to
83 * any of the functions below as they are used to export functions
84 * used by a project regression testsuite.
87 /* Forward declarations for internal helper functions. */
88 static int sctp_writeable(struct sock
*sk
);
89 static void sctp_wfree(struct sk_buff
*skb
);
90 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
92 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
);
93 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
94 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
95 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
96 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
97 union sctp_addr
*addr
, int len
);
98 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
99 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
100 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
101 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
102 static int sctp_send_asconf(struct sctp_association
*asoc
,
103 struct sctp_chunk
*chunk
);
104 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
105 static int sctp_autobind(struct sock
*sk
);
106 static void sctp_sock_migrate(struct sock
*, struct sock
*,
107 struct sctp_association
*, sctp_socket_type_t
);
108 static char *sctp_hmac_alg
= SCTP_COOKIE_HMAC_ALG
;
110 extern struct kmem_cache
*sctp_bucket_cachep
;
111 extern int sysctl_sctp_mem
[3];
112 extern int sysctl_sctp_rmem
[3];
113 extern int sysctl_sctp_wmem
[3];
115 static int sctp_memory_pressure
;
116 static atomic_t sctp_memory_allocated
;
117 static atomic_t sctp_sockets_allocated
;
119 static void sctp_enter_memory_pressure(void)
121 sctp_memory_pressure
= 1;
125 /* Get the sndbuf space available at the time on the association. */
126 static inline int sctp_wspace(struct sctp_association
*asoc
)
130 if (asoc
->ep
->sndbuf_policy
)
131 amt
= asoc
->sndbuf_used
;
133 amt
= atomic_read(&asoc
->base
.sk
->sk_wmem_alloc
);
135 if (amt
>= asoc
->base
.sk
->sk_sndbuf
) {
136 if (asoc
->base
.sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)
139 amt
= sk_stream_wspace(asoc
->base
.sk
);
144 amt
= asoc
->base
.sk
->sk_sndbuf
- amt
;
149 /* Increment the used sndbuf space count of the corresponding association by
150 * the size of the outgoing data chunk.
151 * Also, set the skb destructor for sndbuf accounting later.
153 * Since it is always 1-1 between chunk and skb, and also a new skb is always
154 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
155 * destructor in the data chunk skb for the purpose of the sndbuf space
158 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
160 struct sctp_association
*asoc
= chunk
->asoc
;
161 struct sock
*sk
= asoc
->base
.sk
;
163 /* The sndbuf space is tracked per association. */
164 sctp_association_hold(asoc
);
166 skb_set_owner_w(chunk
->skb
, sk
);
168 chunk
->skb
->destructor
= sctp_wfree
;
169 /* Save the chunk pointer in skb for sctp_wfree to use later. */
170 *((struct sctp_chunk
**)(chunk
->skb
->cb
)) = chunk
;
172 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
173 sizeof(struct sk_buff
) +
174 sizeof(struct sctp_chunk
);
176 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
177 sk
->sk_wmem_queued
+= chunk
->skb
->truesize
;
178 sk_mem_charge(sk
, chunk
->skb
->truesize
);
181 /* Verify that this is a valid address. */
182 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
187 /* Verify basic sockaddr. */
188 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
192 /* Is this a valid SCTP address? */
193 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
196 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
202 /* Look up the association by its id. If this is not a UDP-style
203 * socket, the ID field is always ignored.
205 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
207 struct sctp_association
*asoc
= NULL
;
209 /* If this is not a UDP-style socket, assoc id should be ignored. */
210 if (!sctp_style(sk
, UDP
)) {
211 /* Return NULL if the socket state is not ESTABLISHED. It
212 * could be a TCP-style listening socket or a socket which
213 * hasn't yet called connect() to establish an association.
215 if (!sctp_sstate(sk
, ESTABLISHED
))
218 /* Get the first and the only association from the list. */
219 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
220 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
221 struct sctp_association
, asocs
);
225 /* Otherwise this is a UDP-style socket. */
226 if (!id
|| (id
== (sctp_assoc_t
)-1))
229 spin_lock_bh(&sctp_assocs_id_lock
);
230 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
231 spin_unlock_bh(&sctp_assocs_id_lock
);
233 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
239 /* Look up the transport from an address and an assoc id. If both address and
240 * id are specified, the associations matching the address and the id should be
243 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
244 struct sockaddr_storage
*addr
,
247 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
248 struct sctp_transport
*transport
;
249 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
251 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
258 id_asoc
= sctp_id2assoc(sk
, id
);
259 if (id_asoc
&& (id_asoc
!= addr_asoc
))
262 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
263 (union sctp_addr
*)addr
);
268 /* API 3.1.2 bind() - UDP Style Syntax
269 * The syntax of bind() is,
271 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
273 * sd - the socket descriptor returned by socket().
274 * addr - the address structure (struct sockaddr_in or struct
275 * sockaddr_in6 [RFC 2553]),
276 * addr_len - the size of the address structure.
278 SCTP_STATIC
int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
284 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
287 /* Disallow binding twice. */
288 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
289 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
294 sctp_release_sock(sk
);
299 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
301 /* Verify this is a valid sockaddr. */
302 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
303 union sctp_addr
*addr
, int len
)
307 /* Check minimum size. */
308 if (len
< sizeof (struct sockaddr
))
311 /* Does this PF support this AF? */
312 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
315 /* If we get this far, af is valid. */
316 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
318 if (len
< af
->sockaddr_len
)
324 /* Bind a local address either to an endpoint or to an association. */
325 SCTP_STATIC
int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
327 struct sctp_sock
*sp
= sctp_sk(sk
);
328 struct sctp_endpoint
*ep
= sp
->ep
;
329 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
334 /* Common sockaddr verification. */
335 af
= sctp_sockaddr_af(sp
, addr
, len
);
337 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
342 snum
= ntohs(addr
->v4
.sin_port
);
344 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
345 ", port: %d, new port: %d, len: %d)\n",
351 /* PF specific bind() address verification. */
352 if (!sp
->pf
->bind_verify(sp
, addr
))
353 return -EADDRNOTAVAIL
;
355 /* We must either be unbound, or bind to the same port.
356 * It's OK to allow 0 ports if we are already bound.
357 * We'll just inhert an already bound port in this case
362 else if (snum
!= bp
->port
) {
363 SCTP_DEBUG_PRINTK("sctp_do_bind:"
364 " New port %d does not match existing port "
365 "%d.\n", snum
, bp
->port
);
370 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
373 /* Make sure we are allowed to bind here.
374 * The function sctp_get_port_local() does duplicate address
377 addr
->v4
.sin_port
= htons(snum
);
378 if ((ret
= sctp_get_port_local(sk
, addr
))) {
379 if (ret
== (long) sk
) {
380 /* This endpoint has a conflicting address. */
387 /* Refresh ephemeral port. */
389 bp
->port
= inet_sk(sk
)->num
;
391 /* Add the address to the bind address list.
392 * Use GFP_ATOMIC since BHs will be disabled.
394 ret
= sctp_add_bind_addr(bp
, addr
, SCTP_ADDR_SRC
, GFP_ATOMIC
);
396 /* Copy back into socket for getsockname() use. */
398 inet_sk(sk
)->sport
= htons(inet_sk(sk
)->num
);
399 af
->to_sk_saddr(addr
, sk
);
405 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
407 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
408 * at any one time. If a sender, after sending an ASCONF chunk, decides
409 * it needs to transfer another ASCONF Chunk, it MUST wait until the
410 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
411 * subsequent ASCONF. Note this restriction binds each side, so at any
412 * time two ASCONF may be in-transit on any given association (one sent
413 * from each endpoint).
415 static int sctp_send_asconf(struct sctp_association
*asoc
,
416 struct sctp_chunk
*chunk
)
420 /* If there is an outstanding ASCONF chunk, queue it for later
423 if (asoc
->addip_last_asconf
) {
424 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
428 /* Hold the chunk until an ASCONF_ACK is received. */
429 sctp_chunk_hold(chunk
);
430 retval
= sctp_primitive_ASCONF(asoc
, chunk
);
432 sctp_chunk_free(chunk
);
434 asoc
->addip_last_asconf
= chunk
;
440 /* Add a list of addresses as bind addresses to local endpoint or
443 * Basically run through each address specified in the addrs/addrcnt
444 * array/length pair, determine if it is IPv6 or IPv4 and call
445 * sctp_do_bind() on it.
447 * If any of them fails, then the operation will be reversed and the
448 * ones that were added will be removed.
450 * Only sctp_setsockopt_bindx() is supposed to call this function.
452 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
457 struct sockaddr
*sa_addr
;
460 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
464 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
465 /* The list may contain either IPv4 or IPv6 address;
466 * determine the address length for walking thru the list.
468 sa_addr
= (struct sockaddr
*)addr_buf
;
469 af
= sctp_get_af_specific(sa_addr
->sa_family
);
475 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
478 addr_buf
+= af
->sockaddr_len
;
482 /* Failed. Cleanup the ones that have been added */
484 sctp_bindx_rem(sk
, addrs
, cnt
);
492 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
493 * associations that are part of the endpoint indicating that a list of local
494 * addresses are added to the endpoint.
496 * If any of the addresses is already in the bind address list of the
497 * association, we do not send the chunk for that association. But it will not
498 * affect other associations.
500 * Only sctp_setsockopt_bindx() is supposed to call this function.
502 static int sctp_send_asconf_add_ip(struct sock
*sk
,
503 struct sockaddr
*addrs
,
506 struct sctp_sock
*sp
;
507 struct sctp_endpoint
*ep
;
508 struct sctp_association
*asoc
;
509 struct sctp_bind_addr
*bp
;
510 struct sctp_chunk
*chunk
;
511 struct sctp_sockaddr_entry
*laddr
;
512 union sctp_addr
*addr
;
513 union sctp_addr saveaddr
;
516 struct list_head
*pos
;
521 if (!sctp_addip_enable
)
527 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
528 __FUNCTION__
, sk
, addrs
, addrcnt
);
530 list_for_each(pos
, &ep
->asocs
) {
531 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
533 if (!asoc
->peer
.asconf_capable
)
536 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
539 if (!sctp_state(asoc
, ESTABLISHED
))
542 /* Check if any address in the packed array of addresses is
543 * in the bind address list of the association. If so,
544 * do not send the asconf chunk to its peer, but continue with
545 * other associations.
548 for (i
= 0; i
< addrcnt
; i
++) {
549 addr
= (union sctp_addr
*)addr_buf
;
550 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
556 if (sctp_assoc_lookup_laddr(asoc
, addr
))
559 addr_buf
+= af
->sockaddr_len
;
564 /* Use the first valid address in bind addr list of
565 * association as Address Parameter of ASCONF CHUNK.
567 bp
= &asoc
->base
.bind_addr
;
568 p
= bp
->address_list
.next
;
569 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
570 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
571 addrcnt
, SCTP_PARAM_ADD_IP
);
577 retval
= sctp_send_asconf(asoc
, chunk
);
581 /* Add the new addresses to the bind address list with
582 * use_as_src set to 0.
585 for (i
= 0; i
< addrcnt
; i
++) {
586 addr
= (union sctp_addr
*)addr_buf
;
587 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
588 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
589 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
590 SCTP_ADDR_NEW
, GFP_ATOMIC
);
591 addr_buf
+= af
->sockaddr_len
;
599 /* Remove a list of addresses from bind addresses list. Do not remove the
602 * Basically run through each address specified in the addrs/addrcnt
603 * array/length pair, determine if it is IPv6 or IPv4 and call
604 * sctp_del_bind() on it.
606 * If any of them fails, then the operation will be reversed and the
607 * ones that were removed will be added back.
609 * At least one address has to be left; if only one address is
610 * available, the operation will return -EBUSY.
612 * Only sctp_setsockopt_bindx() is supposed to call this function.
614 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
616 struct sctp_sock
*sp
= sctp_sk(sk
);
617 struct sctp_endpoint
*ep
= sp
->ep
;
619 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
622 union sctp_addr
*sa_addr
;
625 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
629 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
630 /* If the bind address list is empty or if there is only one
631 * bind address, there is nothing more to be removed (we need
632 * at least one address here).
634 if (list_empty(&bp
->address_list
) ||
635 (sctp_list_single_entry(&bp
->address_list
))) {
640 sa_addr
= (union sctp_addr
*)addr_buf
;
641 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
647 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
648 retval
= -EADDRNOTAVAIL
;
652 if (sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
657 /* FIXME - There is probably a need to check if sk->sk_saddr and
658 * sk->sk_rcv_addr are currently set to one of the addresses to
659 * be removed. This is something which needs to be looked into
660 * when we are fixing the outstanding issues with multi-homing
661 * socket routing and failover schemes. Refer to comments in
662 * sctp_do_bind(). -daisy
664 retval
= sctp_del_bind_addr(bp
, sa_addr
);
666 addr_buf
+= af
->sockaddr_len
;
669 /* Failed. Add the ones that has been removed back */
671 sctp_bindx_add(sk
, addrs
, cnt
);
679 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
680 * the associations that are part of the endpoint indicating that a list of
681 * local addresses are removed from the endpoint.
683 * If any of the addresses is already in the bind address list of the
684 * association, we do not send the chunk for that association. But it will not
685 * affect other associations.
687 * Only sctp_setsockopt_bindx() is supposed to call this function.
689 static int sctp_send_asconf_del_ip(struct sock
*sk
,
690 struct sockaddr
*addrs
,
693 struct sctp_sock
*sp
;
694 struct sctp_endpoint
*ep
;
695 struct sctp_association
*asoc
;
696 struct sctp_transport
*transport
;
697 struct sctp_bind_addr
*bp
;
698 struct sctp_chunk
*chunk
;
699 union sctp_addr
*laddr
;
702 struct list_head
*pos
, *pos1
;
703 struct sctp_sockaddr_entry
*saddr
;
707 if (!sctp_addip_enable
)
713 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
714 __FUNCTION__
, sk
, addrs
, addrcnt
);
716 list_for_each(pos
, &ep
->asocs
) {
717 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
719 if (!asoc
->peer
.asconf_capable
)
722 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
725 if (!sctp_state(asoc
, ESTABLISHED
))
728 /* Check if any address in the packed array of addresses is
729 * not present in the bind address list of the association.
730 * If so, do not send the asconf chunk to its peer, but
731 * continue with other associations.
734 for (i
= 0; i
< addrcnt
; i
++) {
735 laddr
= (union sctp_addr
*)addr_buf
;
736 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
742 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
745 addr_buf
+= af
->sockaddr_len
;
750 /* Find one address in the association's bind address list
751 * that is not in the packed array of addresses. This is to
752 * make sure that we do not delete all the addresses in the
755 bp
= &asoc
->base
.bind_addr
;
756 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
761 /* We do not need RCU protection throughout this loop
762 * because this is done under a socket lock from the
765 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
772 /* Reset use_as_src flag for the addresses in the bind address
773 * list that are to be deleted.
776 for (i
= 0; i
< addrcnt
; i
++) {
777 laddr
= (union sctp_addr
*)addr_buf
;
778 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
779 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
780 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
781 saddr
->state
= SCTP_ADDR_DEL
;
783 addr_buf
+= af
->sockaddr_len
;
786 /* Update the route and saddr entries for all the transports
787 * as some of the addresses in the bind address list are
788 * about to be deleted and cannot be used as source addresses.
790 list_for_each(pos1
, &asoc
->peer
.transport_addr_list
) {
791 transport
= list_entry(pos1
, struct sctp_transport
,
793 dst_release(transport
->dst
);
794 sctp_transport_route(transport
, NULL
,
795 sctp_sk(asoc
->base
.sk
));
798 retval
= sctp_send_asconf(asoc
, chunk
);
804 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
807 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
810 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
811 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
814 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
815 * Section 3.1.2 for this usage.
817 * addrs is a pointer to an array of one or more socket addresses. Each
818 * address is contained in its appropriate structure (i.e. struct
819 * sockaddr_in or struct sockaddr_in6) the family of the address type
820 * must be used to distinguish the address length (note that this
821 * representation is termed a "packed array" of addresses). The caller
822 * specifies the number of addresses in the array with addrcnt.
824 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
825 * -1, and sets errno to the appropriate error code.
827 * For SCTP, the port given in each socket address must be the same, or
828 * sctp_bindx() will fail, setting errno to EINVAL.
830 * The flags parameter is formed from the bitwise OR of zero or more of
831 * the following currently defined flags:
833 * SCTP_BINDX_ADD_ADDR
835 * SCTP_BINDX_REM_ADDR
837 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
838 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
839 * addresses from the association. The two flags are mutually exclusive;
840 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
841 * not remove all addresses from an association; sctp_bindx() will
842 * reject such an attempt with EINVAL.
844 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
845 * additional addresses with an endpoint after calling bind(). Or use
846 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
847 * socket is associated with so that no new association accepted will be
848 * associated with those addresses. If the endpoint supports dynamic
849 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
850 * endpoint to send the appropriate message to the peer to change the
851 * peers address lists.
853 * Adding and removing addresses from a connected association is
854 * optional functionality. Implementations that do not support this
855 * functionality should return EOPNOTSUPP.
857 * Basically do nothing but copying the addresses from user to kernel
858 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
859 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
862 * We don't use copy_from_user() for optimization: we first do the
863 * sanity checks (buffer size -fast- and access check-healthy
864 * pointer); if all of those succeed, then we can alloc the memory
865 * (expensive operation) needed to copy the data to kernel. Then we do
866 * the copying without checking the user space area
867 * (__copy_from_user()).
869 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
872 * sk The sk of the socket
873 * addrs The pointer to the addresses in user land
874 * addrssize Size of the addrs buffer
875 * op Operation to perform (add or remove, see the flags of
878 * Returns 0 if ok, <0 errno code on error.
880 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
881 struct sockaddr __user
*addrs
,
882 int addrs_size
, int op
)
884 struct sockaddr
*kaddrs
;
888 struct sockaddr
*sa_addr
;
892 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
893 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
895 if (unlikely(addrs_size
<= 0))
898 /* Check the user passed a healthy pointer. */
899 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
902 /* Alloc space for the address array in kernel memory. */
903 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
904 if (unlikely(!kaddrs
))
907 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
912 /* Walk through the addrs buffer and count the number of addresses. */
914 while (walk_size
< addrs_size
) {
915 sa_addr
= (struct sockaddr
*)addr_buf
;
916 af
= sctp_get_af_specific(sa_addr
->sa_family
);
918 /* If the address family is not supported or if this address
919 * causes the address buffer to overflow return EINVAL.
921 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
926 addr_buf
+= af
->sockaddr_len
;
927 walk_size
+= af
->sockaddr_len
;
932 case SCTP_BINDX_ADD_ADDR
:
933 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
936 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
939 case SCTP_BINDX_REM_ADDR
:
940 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
943 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
957 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
959 * Common routine for handling connect() and sctp_connectx().
960 * Connect will come in with just a single address.
962 static int __sctp_connect(struct sock
* sk
,
963 struct sockaddr
*kaddrs
,
966 struct sctp_sock
*sp
;
967 struct sctp_endpoint
*ep
;
968 struct sctp_association
*asoc
= NULL
;
969 struct sctp_association
*asoc2
;
970 struct sctp_transport
*transport
;
978 union sctp_addr
*sa_addr
= NULL
;
981 unsigned int f_flags
= 0;
986 /* connect() cannot be done on a socket that is already in ESTABLISHED
987 * state - UDP-style peeled off socket or a TCP-style socket that
988 * is already connected.
989 * It cannot be done even on a TCP-style listening socket.
991 if (sctp_sstate(sk
, ESTABLISHED
) ||
992 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
997 /* Walk through the addrs buffer and count the number of addresses. */
999 while (walk_size
< addrs_size
) {
1000 sa_addr
= (union sctp_addr
*)addr_buf
;
1001 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1002 port
= ntohs(sa_addr
->v4
.sin_port
);
1004 /* If the address family is not supported or if this address
1005 * causes the address buffer to overflow return EINVAL.
1007 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1012 /* Save current address so we can work with it */
1013 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1015 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1019 /* Make sure the destination port is correctly set
1022 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
)
1026 /* Check if there already is a matching association on the
1027 * endpoint (other than the one created here).
1029 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1030 if (asoc2
&& asoc2
!= asoc
) {
1031 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1038 /* If we could not find a matching association on the endpoint,
1039 * make sure that there is no peeled-off association matching
1040 * the peer address even on another socket.
1042 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1043 err
= -EADDRNOTAVAIL
;
1048 /* If a bind() or sctp_bindx() is not called prior to
1049 * an sctp_connectx() call, the system picks an
1050 * ephemeral port and will choose an address set
1051 * equivalent to binding with a wildcard address.
1053 if (!ep
->base
.bind_addr
.port
) {
1054 if (sctp_autobind(sk
)) {
1060 * If an unprivileged user inherits a 1-many
1061 * style socket with open associations on a
1062 * privileged port, it MAY be permitted to
1063 * accept new associations, but it SHOULD NOT
1064 * be permitted to open new associations.
1066 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1067 !capable(CAP_NET_BIND_SERVICE
)) {
1073 scope
= sctp_scope(&to
);
1074 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1081 /* Prime the peer's transport structures. */
1082 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1090 addr_buf
+= af
->sockaddr_len
;
1091 walk_size
+= af
->sockaddr_len
;
1094 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1099 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1104 /* Initialize sk's dport and daddr for getpeername() */
1105 inet_sk(sk
)->dport
= htons(asoc
->peer
.port
);
1106 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1107 af
->to_sk_daddr(sa_addr
, sk
);
1110 /* in-kernel sockets don't generally have a file allocated to them
1111 * if all they do is call sock_create_kern().
1113 if (sk
->sk_socket
->file
)
1114 f_flags
= sk
->sk_socket
->file
->f_flags
;
1116 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1118 err
= sctp_wait_for_connect(asoc
, &timeo
);
1120 /* Don't free association on exit. */
1125 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1126 " kaddrs: %p err: %d\n",
1129 sctp_association_free(asoc
);
1133 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1136 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
1138 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1139 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1140 * or IPv6 addresses.
1142 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1143 * Section 3.1.2 for this usage.
1145 * addrs is a pointer to an array of one or more socket addresses. Each
1146 * address is contained in its appropriate structure (i.e. struct
1147 * sockaddr_in or struct sockaddr_in6) the family of the address type
1148 * must be used to distengish the address length (note that this
1149 * representation is termed a "packed array" of addresses). The caller
1150 * specifies the number of addresses in the array with addrcnt.
1152 * On success, sctp_connectx() returns 0. On failure, sctp_connectx() returns
1153 * -1, and sets errno to the appropriate error code.
1155 * For SCTP, the port given in each socket address must be the same, or
1156 * sctp_connectx() will fail, setting errno to EINVAL.
1158 * An application can use sctp_connectx to initiate an association with
1159 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1160 * allows a caller to specify multiple addresses at which a peer can be
1161 * reached. The way the SCTP stack uses the list of addresses to set up
1162 * the association is implementation dependant. This function only
1163 * specifies that the stack will try to make use of all the addresses in
1164 * the list when needed.
1166 * Note that the list of addresses passed in is only used for setting up
1167 * the association. It does not necessarily equal the set of addresses
1168 * the peer uses for the resulting association. If the caller wants to
1169 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1170 * retrieve them after the association has been set up.
1172 * Basically do nothing but copying the addresses from user to kernel
1173 * land and invoking either sctp_connectx(). This is used for tunneling
1174 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1176 * We don't use copy_from_user() for optimization: we first do the
1177 * sanity checks (buffer size -fast- and access check-healthy
1178 * pointer); if all of those succeed, then we can alloc the memory
1179 * (expensive operation) needed to copy the data to kernel. Then we do
1180 * the copying without checking the user space area
1181 * (__copy_from_user()).
1183 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1186 * sk The sk of the socket
1187 * addrs The pointer to the addresses in user land
1188 * addrssize Size of the addrs buffer
1190 * Returns 0 if ok, <0 errno code on error.
1192 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1193 struct sockaddr __user
*addrs
,
1197 struct sockaddr
*kaddrs
;
1199 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1200 __FUNCTION__
, sk
, addrs
, addrs_size
);
1202 if (unlikely(addrs_size
<= 0))
1205 /* Check the user passed a healthy pointer. */
1206 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1209 /* Alloc space for the address array in kernel memory. */
1210 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1211 if (unlikely(!kaddrs
))
1214 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1217 err
= __sctp_connect(sk
, kaddrs
, addrs_size
);
1224 /* API 3.1.4 close() - UDP Style Syntax
1225 * Applications use close() to perform graceful shutdown (as described in
1226 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1227 * by a UDP-style socket.
1231 * ret = close(int sd);
1233 * sd - the socket descriptor of the associations to be closed.
1235 * To gracefully shutdown a specific association represented by the
1236 * UDP-style socket, an application should use the sendmsg() call,
1237 * passing no user data, but including the appropriate flag in the
1238 * ancillary data (see Section xxxx).
1240 * If sd in the close() call is a branched-off socket representing only
1241 * one association, the shutdown is performed on that association only.
1243 * 4.1.6 close() - TCP Style Syntax
1245 * Applications use close() to gracefully close down an association.
1249 * int close(int sd);
1251 * sd - the socket descriptor of the association to be closed.
1253 * After an application calls close() on a socket descriptor, no further
1254 * socket operations will succeed on that descriptor.
1256 * API 7.1.4 SO_LINGER
1258 * An application using the TCP-style socket can use this option to
1259 * perform the SCTP ABORT primitive. The linger option structure is:
1262 * int l_onoff; // option on/off
1263 * int l_linger; // linger time
1266 * To enable the option, set l_onoff to 1. If the l_linger value is set
1267 * to 0, calling close() is the same as the ABORT primitive. If the
1268 * value is set to a negative value, the setsockopt() call will return
1269 * an error. If the value is set to a positive value linger_time, the
1270 * close() can be blocked for at most linger_time ms. If the graceful
1271 * shutdown phase does not finish during this period, close() will
1272 * return but the graceful shutdown phase continues in the system.
1274 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1276 struct sctp_endpoint
*ep
;
1277 struct sctp_association
*asoc
;
1278 struct list_head
*pos
, *temp
;
1280 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1283 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1285 ep
= sctp_sk(sk
)->ep
;
1287 /* Walk all associations on an endpoint. */
1288 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1289 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1291 if (sctp_style(sk
, TCP
)) {
1292 /* A closed association can still be in the list if
1293 * it belongs to a TCP-style listening socket that is
1294 * not yet accepted. If so, free it. If not, send an
1295 * ABORT or SHUTDOWN based on the linger options.
1297 if (sctp_state(asoc
, CLOSED
)) {
1298 sctp_unhash_established(asoc
);
1299 sctp_association_free(asoc
);
1304 if (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
) {
1305 struct sctp_chunk
*chunk
;
1307 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1309 sctp_primitive_ABORT(asoc
, chunk
);
1311 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1314 /* Clean up any skbs sitting on the receive queue. */
1315 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1316 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1318 /* On a TCP-style socket, block for at most linger_time if set. */
1319 if (sctp_style(sk
, TCP
) && timeout
)
1320 sctp_wait_for_close(sk
, timeout
);
1322 /* This will run the backlog queue. */
1323 sctp_release_sock(sk
);
1325 /* Supposedly, no process has access to the socket, but
1326 * the net layers still may.
1328 sctp_local_bh_disable();
1329 sctp_bh_lock_sock(sk
);
1331 /* Hold the sock, since sk_common_release() will put sock_put()
1332 * and we have just a little more cleanup.
1335 sk_common_release(sk
);
1337 sctp_bh_unlock_sock(sk
);
1338 sctp_local_bh_enable();
1342 SCTP_DBG_OBJCNT_DEC(sock
);
1345 /* Handle EPIPE error. */
1346 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1349 err
= sock_error(sk
) ? : -EPIPE
;
1350 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1351 send_sig(SIGPIPE
, current
, 0);
1355 /* API 3.1.3 sendmsg() - UDP Style Syntax
1357 * An application uses sendmsg() and recvmsg() calls to transmit data to
1358 * and receive data from its peer.
1360 * ssize_t sendmsg(int socket, const struct msghdr *message,
1363 * socket - the socket descriptor of the endpoint.
1364 * message - pointer to the msghdr structure which contains a single
1365 * user message and possibly some ancillary data.
1367 * See Section 5 for complete description of the data
1370 * flags - flags sent or received with the user message, see Section
1371 * 5 for complete description of the flags.
1373 * Note: This function could use a rewrite especially when explicit
1374 * connect support comes in.
1376 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1378 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1380 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1381 struct msghdr
*msg
, size_t msg_len
)
1383 struct sctp_sock
*sp
;
1384 struct sctp_endpoint
*ep
;
1385 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1386 struct sctp_transport
*transport
, *chunk_tp
;
1387 struct sctp_chunk
*chunk
;
1389 struct sockaddr
*msg_name
= NULL
;
1390 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1391 struct sctp_sndrcvinfo
*sinfo
;
1392 struct sctp_initmsg
*sinit
;
1393 sctp_assoc_t associd
= 0;
1394 sctp_cmsgs_t cmsgs
= { NULL
};
1398 __u16 sinfo_flags
= 0;
1399 struct sctp_datamsg
*datamsg
;
1400 struct list_head
*pos
;
1401 int msg_flags
= msg
->msg_flags
;
1403 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1410 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1412 /* We cannot send a message over a TCP-style listening socket. */
1413 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1418 /* Parse out the SCTP CMSGs. */
1419 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1422 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1426 /* Fetch the destination address for this packet. This
1427 * address only selects the association--it is not necessarily
1428 * the address we will send to.
1429 * For a peeled-off socket, msg_name is ignored.
1431 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1432 int msg_namelen
= msg
->msg_namelen
;
1434 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1439 if (msg_namelen
> sizeof(to
))
1440 msg_namelen
= sizeof(to
);
1441 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1442 msg_name
= msg
->msg_name
;
1448 /* Did the user specify SNDRCVINFO? */
1450 sinfo_flags
= sinfo
->sinfo_flags
;
1451 associd
= sinfo
->sinfo_assoc_id
;
1454 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1455 msg_len
, sinfo_flags
);
1457 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1458 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1463 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1464 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1465 * If SCTP_ABORT is set, the message length could be non zero with
1466 * the msg_iov set to the user abort reason.
1468 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1469 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1474 /* If SCTP_ADDR_OVER is set, there must be an address
1475 * specified in msg_name.
1477 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1484 SCTP_DEBUG_PRINTK("About to look up association.\n");
1488 /* If a msg_name has been specified, assume this is to be used. */
1490 /* Look for a matching association on the endpoint. */
1491 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1493 /* If we could not find a matching association on the
1494 * endpoint, make sure that it is not a TCP-style
1495 * socket that already has an association or there is
1496 * no peeled-off association on another socket.
1498 if ((sctp_style(sk
, TCP
) &&
1499 sctp_sstate(sk
, ESTABLISHED
)) ||
1500 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1501 err
= -EADDRNOTAVAIL
;
1506 asoc
= sctp_id2assoc(sk
, associd
);
1514 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1516 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1517 * socket that has an association in CLOSED state. This can
1518 * happen when an accepted socket has an association that is
1521 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1526 if (sinfo_flags
& SCTP_EOF
) {
1527 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1529 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1533 if (sinfo_flags
& SCTP_ABORT
) {
1535 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1541 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1542 sctp_primitive_ABORT(asoc
, chunk
);
1548 /* Do we need to create the association? */
1550 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1552 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1557 /* Check for invalid stream against the stream counts,
1558 * either the default or the user specified stream counts.
1561 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1562 /* Check against the defaults. */
1563 if (sinfo
->sinfo_stream
>=
1564 sp
->initmsg
.sinit_num_ostreams
) {
1569 /* Check against the requested. */
1570 if (sinfo
->sinfo_stream
>=
1571 sinit
->sinit_num_ostreams
) {
1579 * API 3.1.2 bind() - UDP Style Syntax
1580 * If a bind() or sctp_bindx() is not called prior to a
1581 * sendmsg() call that initiates a new association, the
1582 * system picks an ephemeral port and will choose an address
1583 * set equivalent to binding with a wildcard address.
1585 if (!ep
->base
.bind_addr
.port
) {
1586 if (sctp_autobind(sk
)) {
1592 * If an unprivileged user inherits a one-to-many
1593 * style socket with open associations on a privileged
1594 * port, it MAY be permitted to accept new associations,
1595 * but it SHOULD NOT be permitted to open new
1598 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1599 !capable(CAP_NET_BIND_SERVICE
)) {
1605 scope
= sctp_scope(&to
);
1606 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1613 /* If the SCTP_INIT ancillary data is specified, set all
1614 * the association init values accordingly.
1617 if (sinit
->sinit_num_ostreams
) {
1618 asoc
->c
.sinit_num_ostreams
=
1619 sinit
->sinit_num_ostreams
;
1621 if (sinit
->sinit_max_instreams
) {
1622 asoc
->c
.sinit_max_instreams
=
1623 sinit
->sinit_max_instreams
;
1625 if (sinit
->sinit_max_attempts
) {
1626 asoc
->max_init_attempts
1627 = sinit
->sinit_max_attempts
;
1629 if (sinit
->sinit_max_init_timeo
) {
1630 asoc
->max_init_timeo
=
1631 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1635 /* Prime the peer's transport structures. */
1636 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1641 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1648 /* ASSERT: we have a valid association at this point. */
1649 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1652 /* If the user didn't specify SNDRCVINFO, make up one with
1655 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1656 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1657 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1658 default_sinfo
.sinfo_context
= asoc
->default_context
;
1659 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1660 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1661 sinfo
= &default_sinfo
;
1664 /* API 7.1.7, the sndbuf size per association bounds the
1665 * maximum size of data that can be sent in a single send call.
1667 if (msg_len
> sk
->sk_sndbuf
) {
1672 if (asoc
->pmtu_pending
)
1673 sctp_assoc_pending_pmtu(asoc
);
1675 /* If fragmentation is disabled and the message length exceeds the
1676 * association fragmentation point, return EMSGSIZE. The I-D
1677 * does not specify what this error is, but this looks like
1680 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1686 /* Check for invalid stream. */
1687 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1693 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1694 if (!sctp_wspace(asoc
)) {
1695 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1700 /* If an address is passed with the sendto/sendmsg call, it is used
1701 * to override the primary destination address in the TCP model, or
1702 * when SCTP_ADDR_OVER flag is set in the UDP model.
1704 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1705 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1706 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1714 /* Auto-connect, if we aren't connected already. */
1715 if (sctp_state(asoc
, CLOSED
)) {
1716 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1719 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1722 /* Break the message into multiple chunks of maximum size. */
1723 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1729 /* Now send the (possibly) fragmented message. */
1730 list_for_each(pos
, &datamsg
->chunks
) {
1731 chunk
= list_entry(pos
, struct sctp_chunk
, frag_list
);
1732 sctp_datamsg_track(chunk
);
1734 /* Do accounting for the write space. */
1735 sctp_set_owner_w(chunk
);
1737 chunk
->transport
= chunk_tp
;
1739 /* Send it to the lower layers. Note: all chunks
1740 * must either fail or succeed. The lower layer
1741 * works that way today. Keep it that way or this
1744 err
= sctp_primitive_SEND(asoc
, chunk
);
1745 /* Did the lower layer accept the chunk? */
1747 sctp_chunk_free(chunk
);
1748 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1751 sctp_datamsg_free(datamsg
);
1757 /* If we are already past ASSOCIATE, the lower
1758 * layers are responsible for association cleanup.
1764 sctp_association_free(asoc
);
1766 sctp_release_sock(sk
);
1769 return sctp_error(sk
, msg_flags
, err
);
1776 err
= sock_error(sk
);
1786 /* This is an extended version of skb_pull() that removes the data from the
1787 * start of a skb even when data is spread across the list of skb's in the
1788 * frag_list. len specifies the total amount of data that needs to be removed.
1789 * when 'len' bytes could be removed from the skb, it returns 0.
1790 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1791 * could not be removed.
1793 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1795 struct sk_buff
*list
;
1796 int skb_len
= skb_headlen(skb
);
1799 if (len
<= skb_len
) {
1800 __skb_pull(skb
, len
);
1804 __skb_pull(skb
, skb_len
);
1806 for (list
= skb_shinfo(skb
)->frag_list
; list
; list
= list
->next
) {
1807 rlen
= sctp_skb_pull(list
, len
);
1808 skb
->len
-= (len
-rlen
);
1809 skb
->data_len
-= (len
-rlen
);
1820 /* API 3.1.3 recvmsg() - UDP Style Syntax
1822 * ssize_t recvmsg(int socket, struct msghdr *message,
1825 * socket - the socket descriptor of the endpoint.
1826 * message - pointer to the msghdr structure which contains a single
1827 * user message and possibly some ancillary data.
1829 * See Section 5 for complete description of the data
1832 * flags - flags sent or received with the user message, see Section
1833 * 5 for complete description of the flags.
1835 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1837 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1838 struct msghdr
*msg
, size_t len
, int noblock
,
1839 int flags
, int *addr_len
)
1841 struct sctp_ulpevent
*event
= NULL
;
1842 struct sctp_sock
*sp
= sctp_sk(sk
);
1843 struct sk_buff
*skb
;
1848 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1849 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1850 "len", len
, "knoblauch", noblock
,
1851 "flags", flags
, "addr_len", addr_len
);
1855 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1860 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1864 /* Get the total length of the skb including any skb's in the
1873 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1875 event
= sctp_skb2event(skb
);
1880 sock_recv_timestamp(msg
, sk
, skb
);
1881 if (sctp_ulpevent_is_notification(event
)) {
1882 msg
->msg_flags
|= MSG_NOTIFICATION
;
1883 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1885 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1888 /* Check if we allow SCTP_SNDRCVINFO. */
1889 if (sp
->subscribe
.sctp_data_io_event
)
1890 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1892 /* FIXME: we should be calling IP/IPv6 layers. */
1893 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1894 ip_cmsg_recv(msg
, skb
);
1899 /* If skb's length exceeds the user's buffer, update the skb and
1900 * push it back to the receive_queue so that the next call to
1901 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1903 if (skb_len
> copied
) {
1904 msg
->msg_flags
&= ~MSG_EOR
;
1905 if (flags
& MSG_PEEK
)
1907 sctp_skb_pull(skb
, copied
);
1908 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1910 /* When only partial message is copied to the user, increase
1911 * rwnd by that amount. If all the data in the skb is read,
1912 * rwnd is updated when the event is freed.
1914 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
1916 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
1917 (event
->msg_flags
& MSG_EOR
))
1918 msg
->msg_flags
|= MSG_EOR
;
1920 msg
->msg_flags
&= ~MSG_EOR
;
1923 if (flags
& MSG_PEEK
) {
1924 /* Release the skb reference acquired after peeking the skb in
1925 * sctp_skb_recv_datagram().
1929 /* Free the event which includes releasing the reference to
1930 * the owner of the skb, freeing the skb and updating the
1933 sctp_ulpevent_free(event
);
1936 sctp_release_sock(sk
);
1940 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1942 * This option is a on/off flag. If enabled no SCTP message
1943 * fragmentation will be performed. Instead if a message being sent
1944 * exceeds the current PMTU size, the message will NOT be sent and
1945 * instead a error will be indicated to the user.
1947 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
1948 char __user
*optval
, int optlen
)
1952 if (optlen
< sizeof(int))
1955 if (get_user(val
, (int __user
*)optval
))
1958 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
1963 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
1966 if (optlen
!= sizeof(struct sctp_event_subscribe
))
1968 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
1973 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
1975 * This socket option is applicable to the UDP-style socket only. When
1976 * set it will cause associations that are idle for more than the
1977 * specified number of seconds to automatically close. An association
1978 * being idle is defined an association that has NOT sent or received
1979 * user data. The special value of '0' indicates that no automatic
1980 * close of any associations should be performed. The option expects an
1981 * integer defining the number of seconds of idle time before an
1982 * association is closed.
1984 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
1987 struct sctp_sock
*sp
= sctp_sk(sk
);
1989 /* Applicable to UDP-style socket only */
1990 if (sctp_style(sk
, TCP
))
1992 if (optlen
!= sizeof(int))
1994 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2000 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2002 * Applications can enable or disable heartbeats for any peer address of
2003 * an association, modify an address's heartbeat interval, force a
2004 * heartbeat to be sent immediately, and adjust the address's maximum
2005 * number of retransmissions sent before an address is considered
2006 * unreachable. The following structure is used to access and modify an
2007 * address's parameters:
2009 * struct sctp_paddrparams {
2010 * sctp_assoc_t spp_assoc_id;
2011 * struct sockaddr_storage spp_address;
2012 * uint32_t spp_hbinterval;
2013 * uint16_t spp_pathmaxrxt;
2014 * uint32_t spp_pathmtu;
2015 * uint32_t spp_sackdelay;
2016 * uint32_t spp_flags;
2019 * spp_assoc_id - (one-to-many style socket) This is filled in the
2020 * application, and identifies the association for
2022 * spp_address - This specifies which address is of interest.
2023 * spp_hbinterval - This contains the value of the heartbeat interval,
2024 * in milliseconds. If a value of zero
2025 * is present in this field then no changes are to
2026 * be made to this parameter.
2027 * spp_pathmaxrxt - This contains the maximum number of
2028 * retransmissions before this address shall be
2029 * considered unreachable. If a value of zero
2030 * is present in this field then no changes are to
2031 * be made to this parameter.
2032 * spp_pathmtu - When Path MTU discovery is disabled the value
2033 * specified here will be the "fixed" path mtu.
2034 * Note that if the spp_address field is empty
2035 * then all associations on this address will
2036 * have this fixed path mtu set upon them.
2038 * spp_sackdelay - When delayed sack is enabled, this value specifies
2039 * the number of milliseconds that sacks will be delayed
2040 * for. This value will apply to all addresses of an
2041 * association if the spp_address field is empty. Note
2042 * also, that if delayed sack is enabled and this
2043 * value is set to 0, no change is made to the last
2044 * recorded delayed sack timer value.
2046 * spp_flags - These flags are used to control various features
2047 * on an association. The flag field may contain
2048 * zero or more of the following options.
2050 * SPP_HB_ENABLE - Enable heartbeats on the
2051 * specified address. Note that if the address
2052 * field is empty all addresses for the association
2053 * have heartbeats enabled upon them.
2055 * SPP_HB_DISABLE - Disable heartbeats on the
2056 * speicifed address. Note that if the address
2057 * field is empty all addresses for the association
2058 * will have their heartbeats disabled. Note also
2059 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2060 * mutually exclusive, only one of these two should
2061 * be specified. Enabling both fields will have
2062 * undetermined results.
2064 * SPP_HB_DEMAND - Request a user initiated heartbeat
2065 * to be made immediately.
2067 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2068 * heartbeat delayis to be set to the value of 0
2071 * SPP_PMTUD_ENABLE - This field will enable PMTU
2072 * discovery upon the specified address. Note that
2073 * if the address feild is empty then all addresses
2074 * on the association are effected.
2076 * SPP_PMTUD_DISABLE - This field will disable PMTU
2077 * discovery upon the specified address. Note that
2078 * if the address feild is empty then all addresses
2079 * on the association are effected. Not also that
2080 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2081 * exclusive. Enabling both will have undetermined
2084 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2085 * on delayed sack. The time specified in spp_sackdelay
2086 * is used to specify the sack delay for this address. Note
2087 * that if spp_address is empty then all addresses will
2088 * enable delayed sack and take on the sack delay
2089 * value specified in spp_sackdelay.
2090 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2091 * off delayed sack. If the spp_address field is blank then
2092 * delayed sack is disabled for the entire association. Note
2093 * also that this field is mutually exclusive to
2094 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2097 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2098 struct sctp_transport
*trans
,
2099 struct sctp_association
*asoc
,
2100 struct sctp_sock
*sp
,
2103 int sackdelay_change
)
2107 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2108 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2113 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2114 * this field is ignored. Note also that a value of zero indicates
2115 * the current setting should be left unchanged.
2117 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2119 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2120 * set. This lets us use 0 value when this flag
2123 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2124 params
->spp_hbinterval
= 0;
2126 if (params
->spp_hbinterval
||
2127 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2130 msecs_to_jiffies(params
->spp_hbinterval
);
2133 msecs_to_jiffies(params
->spp_hbinterval
);
2135 sp
->hbinterval
= params
->spp_hbinterval
;
2142 trans
->param_flags
=
2143 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2146 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2149 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2153 /* When Path MTU discovery is disabled the value specified here will
2154 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2155 * include the flag SPP_PMTUD_DISABLE for this field to have any
2158 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2160 trans
->pathmtu
= params
->spp_pathmtu
;
2161 sctp_assoc_sync_pmtu(asoc
);
2163 asoc
->pathmtu
= params
->spp_pathmtu
;
2164 sctp_frag_point(sp
, params
->spp_pathmtu
);
2166 sp
->pathmtu
= params
->spp_pathmtu
;
2172 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2173 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2174 trans
->param_flags
=
2175 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2177 sctp_transport_pmtu(trans
);
2178 sctp_assoc_sync_pmtu(asoc
);
2182 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2185 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2189 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2190 * value of this field is ignored. Note also that a value of zero
2191 * indicates the current setting should be left unchanged.
2193 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2196 msecs_to_jiffies(params
->spp_sackdelay
);
2199 msecs_to_jiffies(params
->spp_sackdelay
);
2201 sp
->sackdelay
= params
->spp_sackdelay
;
2205 if (sackdelay_change
) {
2207 trans
->param_flags
=
2208 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2212 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2216 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2221 /* Note that unless the spp_flag is set to SPP_PMTUD_ENABLE the value
2222 * of this field is ignored. Note also that a value of zero
2223 * indicates the current setting should be left unchanged.
2225 if ((params
->spp_flags
& SPP_PMTUD_ENABLE
) && params
->spp_pathmaxrxt
) {
2227 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2229 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2231 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2238 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2239 char __user
*optval
, int optlen
)
2241 struct sctp_paddrparams params
;
2242 struct sctp_transport
*trans
= NULL
;
2243 struct sctp_association
*asoc
= NULL
;
2244 struct sctp_sock
*sp
= sctp_sk(sk
);
2246 int hb_change
, pmtud_change
, sackdelay_change
;
2248 if (optlen
!= sizeof(struct sctp_paddrparams
))
2251 if (copy_from_user(¶ms
, optval
, optlen
))
2254 /* Validate flags and value parameters. */
2255 hb_change
= params
.spp_flags
& SPP_HB
;
2256 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2257 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2259 if (hb_change
== SPP_HB
||
2260 pmtud_change
== SPP_PMTUD
||
2261 sackdelay_change
== SPP_SACKDELAY
||
2262 params
.spp_sackdelay
> 500 ||
2264 && params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2267 /* If an address other than INADDR_ANY is specified, and
2268 * no transport is found, then the request is invalid.
2270 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
2271 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2272 params
.spp_assoc_id
);
2277 /* Get association, if assoc_id != 0 and the socket is a one
2278 * to many style socket, and an association was not found, then
2279 * the id was invalid.
2281 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2282 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2285 /* Heartbeat demand can only be sent on a transport or
2286 * association, but not a socket.
2288 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2291 /* Process parameters. */
2292 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2293 hb_change
, pmtud_change
,
2299 /* If changes are for association, also apply parameters to each
2302 if (!trans
&& asoc
) {
2303 struct list_head
*pos
;
2305 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2306 trans
= list_entry(pos
, struct sctp_transport
,
2308 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2309 hb_change
, pmtud_change
,
2317 /* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
2319 * This options will get or set the delayed ack timer. The time is set
2320 * in milliseconds. If the assoc_id is 0, then this sets or gets the
2321 * endpoints default delayed ack timer value. If the assoc_id field is
2322 * non-zero, then the set or get effects the specified association.
2324 * struct sctp_assoc_value {
2325 * sctp_assoc_t assoc_id;
2326 * uint32_t assoc_value;
2329 * assoc_id - This parameter, indicates which association the
2330 * user is preforming an action upon. Note that if
2331 * this field's value is zero then the endpoints
2332 * default value is changed (effecting future
2333 * associations only).
2335 * assoc_value - This parameter contains the number of milliseconds
2336 * that the user is requesting the delayed ACK timer
2337 * be set to. Note that this value is defined in
2338 * the standard to be between 200 and 500 milliseconds.
2340 * Note: a value of zero will leave the value alone,
2341 * but disable SACK delay. A non-zero value will also
2342 * enable SACK delay.
2345 static int sctp_setsockopt_delayed_ack_time(struct sock
*sk
,
2346 char __user
*optval
, int optlen
)
2348 struct sctp_assoc_value params
;
2349 struct sctp_transport
*trans
= NULL
;
2350 struct sctp_association
*asoc
= NULL
;
2351 struct sctp_sock
*sp
= sctp_sk(sk
);
2353 if (optlen
!= sizeof(struct sctp_assoc_value
))
2356 if (copy_from_user(¶ms
, optval
, optlen
))
2359 /* Validate value parameter. */
2360 if (params
.assoc_value
> 500)
2363 /* Get association, if assoc_id != 0 and the socket is a one
2364 * to many style socket, and an association was not found, then
2365 * the id was invalid.
2367 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2368 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
2371 if (params
.assoc_value
) {
2374 msecs_to_jiffies(params
.assoc_value
);
2376 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2377 SPP_SACKDELAY_ENABLE
;
2379 sp
->sackdelay
= params
.assoc_value
;
2381 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2382 SPP_SACKDELAY_ENABLE
;
2387 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2388 SPP_SACKDELAY_DISABLE
;
2391 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2392 SPP_SACKDELAY_DISABLE
;
2396 /* If change is for association, also apply to each transport. */
2398 struct list_head
*pos
;
2400 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2401 trans
= list_entry(pos
, struct sctp_transport
,
2403 if (params
.assoc_value
) {
2405 msecs_to_jiffies(params
.assoc_value
);
2406 trans
->param_flags
=
2407 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2408 SPP_SACKDELAY_ENABLE
;
2410 trans
->param_flags
=
2411 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2412 SPP_SACKDELAY_DISABLE
;
2420 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2422 * Applications can specify protocol parameters for the default association
2423 * initialization. The option name argument to setsockopt() and getsockopt()
2426 * Setting initialization parameters is effective only on an unconnected
2427 * socket (for UDP-style sockets only future associations are effected
2428 * by the change). With TCP-style sockets, this option is inherited by
2429 * sockets derived from a listener socket.
2431 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, int optlen
)
2433 struct sctp_initmsg sinit
;
2434 struct sctp_sock
*sp
= sctp_sk(sk
);
2436 if (optlen
!= sizeof(struct sctp_initmsg
))
2438 if (copy_from_user(&sinit
, optval
, optlen
))
2441 if (sinit
.sinit_num_ostreams
)
2442 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2443 if (sinit
.sinit_max_instreams
)
2444 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2445 if (sinit
.sinit_max_attempts
)
2446 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2447 if (sinit
.sinit_max_init_timeo
)
2448 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2454 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2456 * Applications that wish to use the sendto() system call may wish to
2457 * specify a default set of parameters that would normally be supplied
2458 * through the inclusion of ancillary data. This socket option allows
2459 * such an application to set the default sctp_sndrcvinfo structure.
2460 * The application that wishes to use this socket option simply passes
2461 * in to this call the sctp_sndrcvinfo structure defined in Section
2462 * 5.2.2) The input parameters accepted by this call include
2463 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2464 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2465 * to this call if the caller is using the UDP model.
2467 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2468 char __user
*optval
, int optlen
)
2470 struct sctp_sndrcvinfo info
;
2471 struct sctp_association
*asoc
;
2472 struct sctp_sock
*sp
= sctp_sk(sk
);
2474 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2476 if (copy_from_user(&info
, optval
, optlen
))
2479 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2480 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2484 asoc
->default_stream
= info
.sinfo_stream
;
2485 asoc
->default_flags
= info
.sinfo_flags
;
2486 asoc
->default_ppid
= info
.sinfo_ppid
;
2487 asoc
->default_context
= info
.sinfo_context
;
2488 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2490 sp
->default_stream
= info
.sinfo_stream
;
2491 sp
->default_flags
= info
.sinfo_flags
;
2492 sp
->default_ppid
= info
.sinfo_ppid
;
2493 sp
->default_context
= info
.sinfo_context
;
2494 sp
->default_timetolive
= info
.sinfo_timetolive
;
2500 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2502 * Requests that the local SCTP stack use the enclosed peer address as
2503 * the association primary. The enclosed address must be one of the
2504 * association peer's addresses.
2506 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2509 struct sctp_prim prim
;
2510 struct sctp_transport
*trans
;
2512 if (optlen
!= sizeof(struct sctp_prim
))
2515 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2518 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2522 sctp_assoc_set_primary(trans
->asoc
, trans
);
2528 * 7.1.5 SCTP_NODELAY
2530 * Turn on/off any Nagle-like algorithm. This means that packets are
2531 * generally sent as soon as possible and no unnecessary delays are
2532 * introduced, at the cost of more packets in the network. Expects an
2533 * integer boolean flag.
2535 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2540 if (optlen
< sizeof(int))
2542 if (get_user(val
, (int __user
*)optval
))
2545 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2551 * 7.1.1 SCTP_RTOINFO
2553 * The protocol parameters used to initialize and bound retransmission
2554 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2555 * and modify these parameters.
2556 * All parameters are time values, in milliseconds. A value of 0, when
2557 * modifying the parameters, indicates that the current value should not
2561 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, int optlen
) {
2562 struct sctp_rtoinfo rtoinfo
;
2563 struct sctp_association
*asoc
;
2565 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2568 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2571 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2573 /* Set the values to the specific association */
2574 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2578 if (rtoinfo
.srto_initial
!= 0)
2580 msecs_to_jiffies(rtoinfo
.srto_initial
);
2581 if (rtoinfo
.srto_max
!= 0)
2582 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2583 if (rtoinfo
.srto_min
!= 0)
2584 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2586 /* If there is no association or the association-id = 0
2587 * set the values to the endpoint.
2589 struct sctp_sock
*sp
= sctp_sk(sk
);
2591 if (rtoinfo
.srto_initial
!= 0)
2592 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2593 if (rtoinfo
.srto_max
!= 0)
2594 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2595 if (rtoinfo
.srto_min
!= 0)
2596 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2604 * 7.1.2 SCTP_ASSOCINFO
2606 * This option is used to tune the maximum retransmission attempts
2607 * of the association.
2608 * Returns an error if the new association retransmission value is
2609 * greater than the sum of the retransmission value of the peer.
2610 * See [SCTP] for more information.
2613 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, int optlen
)
2616 struct sctp_assocparams assocparams
;
2617 struct sctp_association
*asoc
;
2619 if (optlen
!= sizeof(struct sctp_assocparams
))
2621 if (copy_from_user(&assocparams
, optval
, optlen
))
2624 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2626 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2629 /* Set the values to the specific association */
2631 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2634 struct list_head
*pos
;
2635 struct sctp_transport
*peer_addr
;
2637 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2638 peer_addr
= list_entry(pos
,
2639 struct sctp_transport
,
2641 path_sum
+= peer_addr
->pathmaxrxt
;
2645 /* Only validate asocmaxrxt if we have more then
2646 * one path/transport. We do this because path
2647 * retransmissions are only counted when we have more
2651 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2654 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2657 if (assocparams
.sasoc_cookie_life
!= 0) {
2658 asoc
->cookie_life
.tv_sec
=
2659 assocparams
.sasoc_cookie_life
/ 1000;
2660 asoc
->cookie_life
.tv_usec
=
2661 (assocparams
.sasoc_cookie_life
% 1000)
2665 /* Set the values to the endpoint */
2666 struct sctp_sock
*sp
= sctp_sk(sk
);
2668 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2669 sp
->assocparams
.sasoc_asocmaxrxt
=
2670 assocparams
.sasoc_asocmaxrxt
;
2671 if (assocparams
.sasoc_cookie_life
!= 0)
2672 sp
->assocparams
.sasoc_cookie_life
=
2673 assocparams
.sasoc_cookie_life
;
2679 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2681 * This socket option is a boolean flag which turns on or off mapped V4
2682 * addresses. If this option is turned on and the socket is type
2683 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2684 * If this option is turned off, then no mapping will be done of V4
2685 * addresses and a user will receive both PF_INET6 and PF_INET type
2686 * addresses on the socket.
2688 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, int optlen
)
2691 struct sctp_sock
*sp
= sctp_sk(sk
);
2693 if (optlen
< sizeof(int))
2695 if (get_user(val
, (int __user
*)optval
))
2706 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2708 * This socket option specifies the maximum size to put in any outgoing
2709 * SCTP chunk. If a message is larger than this size it will be
2710 * fragmented by SCTP into the specified size. Note that the underlying
2711 * SCTP implementation may fragment into smaller sized chunks when the
2712 * PMTU of the underlying association is smaller than the value set by
2715 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, int optlen
)
2717 struct sctp_association
*asoc
;
2718 struct list_head
*pos
;
2719 struct sctp_sock
*sp
= sctp_sk(sk
);
2722 if (optlen
< sizeof(int))
2724 if (get_user(val
, (int __user
*)optval
))
2726 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2728 sp
->user_frag
= val
;
2730 /* Update the frag_point of the existing associations. */
2731 list_for_each(pos
, &(sp
->ep
->asocs
)) {
2732 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
2733 asoc
->frag_point
= sctp_frag_point(sp
, asoc
->pathmtu
);
2741 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2743 * Requests that the peer mark the enclosed address as the association
2744 * primary. The enclosed address must be one of the association's
2745 * locally bound addresses. The following structure is used to make a
2746 * set primary request:
2748 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2751 struct sctp_sock
*sp
;
2752 struct sctp_endpoint
*ep
;
2753 struct sctp_association
*asoc
= NULL
;
2754 struct sctp_setpeerprim prim
;
2755 struct sctp_chunk
*chunk
;
2761 if (!sctp_addip_enable
)
2764 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2767 if (copy_from_user(&prim
, optval
, optlen
))
2770 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2774 if (!asoc
->peer
.asconf_capable
)
2777 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2780 if (!sctp_state(asoc
, ESTABLISHED
))
2783 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2784 return -EADDRNOTAVAIL
;
2786 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2787 chunk
= sctp_make_asconf_set_prim(asoc
,
2788 (union sctp_addr
*)&prim
.sspp_addr
);
2792 err
= sctp_send_asconf(asoc
, chunk
);
2794 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2799 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
2802 struct sctp_setadaptation adaptation
;
2804 if (optlen
!= sizeof(struct sctp_setadaptation
))
2806 if (copy_from_user(&adaptation
, optval
, optlen
))
2809 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
2815 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2817 * The context field in the sctp_sndrcvinfo structure is normally only
2818 * used when a failed message is retrieved holding the value that was
2819 * sent down on the actual send call. This option allows the setting of
2820 * a default context on an association basis that will be received on
2821 * reading messages from the peer. This is especially helpful in the
2822 * one-2-many model for an application to keep some reference to an
2823 * internal state machine that is processing messages on the
2824 * association. Note that the setting of this value only effects
2825 * received messages from the peer and does not effect the value that is
2826 * saved with outbound messages.
2828 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
2831 struct sctp_assoc_value params
;
2832 struct sctp_sock
*sp
;
2833 struct sctp_association
*asoc
;
2835 if (optlen
!= sizeof(struct sctp_assoc_value
))
2837 if (copy_from_user(¶ms
, optval
, optlen
))
2842 if (params
.assoc_id
!= 0) {
2843 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2846 asoc
->default_rcv_context
= params
.assoc_value
;
2848 sp
->default_rcv_context
= params
.assoc_value
;
2855 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
2857 * This options will at a minimum specify if the implementation is doing
2858 * fragmented interleave. Fragmented interleave, for a one to many
2859 * socket, is when subsequent calls to receive a message may return
2860 * parts of messages from different associations. Some implementations
2861 * may allow you to turn this value on or off. If so, when turned off,
2862 * no fragment interleave will occur (which will cause a head of line
2863 * blocking amongst multiple associations sharing the same one to many
2864 * socket). When this option is turned on, then each receive call may
2865 * come from a different association (thus the user must receive data
2866 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
2867 * association each receive belongs to.
2869 * This option takes a boolean value. A non-zero value indicates that
2870 * fragmented interleave is on. A value of zero indicates that
2871 * fragmented interleave is off.
2873 * Note that it is important that an implementation that allows this
2874 * option to be turned on, have it off by default. Otherwise an unaware
2875 * application using the one to many model may become confused and act
2878 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
2879 char __user
*optval
,
2884 if (optlen
!= sizeof(int))
2886 if (get_user(val
, (int __user
*)optval
))
2889 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
2895 * 7.1.25. Set or Get the sctp partial delivery point
2896 * (SCTP_PARTIAL_DELIVERY_POINT)
2897 * This option will set or get the SCTP partial delivery point. This
2898 * point is the size of a message where the partial delivery API will be
2899 * invoked to help free up rwnd space for the peer. Setting this to a
2900 * lower value will cause partial delivery's to happen more often. The
2901 * calls argument is an integer that sets or gets the partial delivery
2904 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
2905 char __user
*optval
,
2910 if (optlen
!= sizeof(u32
))
2912 if (get_user(val
, (int __user
*)optval
))
2915 sctp_sk(sk
)->pd_point
= val
;
2917 return 0; /* is this the right error code? */
2921 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
2923 * This option will allow a user to change the maximum burst of packets
2924 * that can be emitted by this association. Note that the default value
2925 * is 4, and some implementations may restrict this setting so that it
2926 * can only be lowered.
2928 * NOTE: This text doesn't seem right. Do this on a socket basis with
2929 * future associations inheriting the socket value.
2931 static int sctp_setsockopt_maxburst(struct sock
*sk
,
2932 char __user
*optval
,
2937 if (optlen
!= sizeof(int))
2939 if (get_user(val
, (int __user
*)optval
))
2945 sctp_sk(sk
)->max_burst
= val
;
2951 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
2953 * This set option adds a chunk type that the user is requesting to be
2954 * received only in an authenticated way. Changes to the list of chunks
2955 * will only effect future associations on the socket.
2957 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
2958 char __user
*optval
,
2961 struct sctp_authchunk val
;
2963 if (optlen
!= sizeof(struct sctp_authchunk
))
2965 if (copy_from_user(&val
, optval
, optlen
))
2968 switch (val
.sauth_chunk
) {
2970 case SCTP_CID_INIT_ACK
:
2971 case SCTP_CID_SHUTDOWN_COMPLETE
:
2976 /* add this chunk id to the endpoint */
2977 return sctp_auth_ep_add_chunkid(sctp_sk(sk
)->ep
, val
.sauth_chunk
);
2981 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
2983 * This option gets or sets the list of HMAC algorithms that the local
2984 * endpoint requires the peer to use.
2986 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
2987 char __user
*optval
,
2990 struct sctp_hmacalgo
*hmacs
;
2993 if (optlen
< sizeof(struct sctp_hmacalgo
))
2996 hmacs
= kmalloc(optlen
, GFP_KERNEL
);
3000 if (copy_from_user(hmacs
, optval
, optlen
)) {
3005 if (hmacs
->shmac_num_idents
== 0 ||
3006 hmacs
->shmac_num_idents
> SCTP_AUTH_NUM_HMACS
) {
3011 err
= sctp_auth_ep_set_hmacs(sctp_sk(sk
)->ep
, hmacs
);
3018 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3020 * This option will set a shared secret key which is used to build an
3021 * association shared key.
3023 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3024 char __user
*optval
,
3027 struct sctp_authkey
*authkey
;
3028 struct sctp_association
*asoc
;
3031 if (optlen
<= sizeof(struct sctp_authkey
))
3034 authkey
= kmalloc(optlen
, GFP_KERNEL
);
3038 if (copy_from_user(authkey
, optval
, optlen
)) {
3043 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3044 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3049 ret
= sctp_auth_set_key(sctp_sk(sk
)->ep
, asoc
, authkey
);
3056 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3058 * This option will get or set the active shared key to be used to build
3059 * the association shared key.
3061 static int sctp_setsockopt_active_key(struct sock
*sk
,
3062 char __user
*optval
,
3065 struct sctp_authkeyid val
;
3066 struct sctp_association
*asoc
;
3068 if (optlen
!= sizeof(struct sctp_authkeyid
))
3070 if (copy_from_user(&val
, optval
, optlen
))
3073 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3074 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3077 return sctp_auth_set_active_key(sctp_sk(sk
)->ep
, asoc
,
3078 val
.scact_keynumber
);
3082 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3084 * This set option will delete a shared secret key from use.
3086 static int sctp_setsockopt_del_key(struct sock
*sk
,
3087 char __user
*optval
,
3090 struct sctp_authkeyid val
;
3091 struct sctp_association
*asoc
;
3093 if (optlen
!= sizeof(struct sctp_authkeyid
))
3095 if (copy_from_user(&val
, optval
, optlen
))
3098 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3099 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3102 return sctp_auth_del_key_id(sctp_sk(sk
)->ep
, asoc
,
3103 val
.scact_keynumber
);
3108 /* API 6.2 setsockopt(), getsockopt()
3110 * Applications use setsockopt() and getsockopt() to set or retrieve
3111 * socket options. Socket options are used to change the default
3112 * behavior of sockets calls. They are described in Section 7.
3116 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3117 * int __user *optlen);
3118 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3121 * sd - the socket descript.
3122 * level - set to IPPROTO_SCTP for all SCTP options.
3123 * optname - the option name.
3124 * optval - the buffer to store the value of the option.
3125 * optlen - the size of the buffer.
3127 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3128 char __user
*optval
, int optlen
)
3132 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3135 /* I can hardly begin to describe how wrong this is. This is
3136 * so broken as to be worse than useless. The API draft
3137 * REALLY is NOT helpful here... I am not convinced that the
3138 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3139 * are at all well-founded.
3141 if (level
!= SOL_SCTP
) {
3142 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3143 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3150 case SCTP_SOCKOPT_BINDX_ADD
:
3151 /* 'optlen' is the size of the addresses buffer. */
3152 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3153 optlen
, SCTP_BINDX_ADD_ADDR
);
3156 case SCTP_SOCKOPT_BINDX_REM
:
3157 /* 'optlen' is the size of the addresses buffer. */
3158 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3159 optlen
, SCTP_BINDX_REM_ADDR
);
3162 case SCTP_SOCKOPT_CONNECTX
:
3163 /* 'optlen' is the size of the addresses buffer. */
3164 retval
= sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)optval
,
3168 case SCTP_DISABLE_FRAGMENTS
:
3169 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3173 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3176 case SCTP_AUTOCLOSE
:
3177 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3180 case SCTP_PEER_ADDR_PARAMS
:
3181 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3184 case SCTP_DELAYED_ACK_TIME
:
3185 retval
= sctp_setsockopt_delayed_ack_time(sk
, optval
, optlen
);
3187 case SCTP_PARTIAL_DELIVERY_POINT
:
3188 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3192 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3194 case SCTP_DEFAULT_SEND_PARAM
:
3195 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3198 case SCTP_PRIMARY_ADDR
:
3199 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3201 case SCTP_SET_PEER_PRIMARY_ADDR
:
3202 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3205 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3208 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3210 case SCTP_ASSOCINFO
:
3211 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3213 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3214 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3217 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3219 case SCTP_ADAPTATION_LAYER
:
3220 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3223 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3225 case SCTP_FRAGMENT_INTERLEAVE
:
3226 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3228 case SCTP_MAX_BURST
:
3229 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3231 case SCTP_AUTH_CHUNK
:
3232 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3234 case SCTP_HMAC_IDENT
:
3235 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3238 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3240 case SCTP_AUTH_ACTIVE_KEY
:
3241 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3243 case SCTP_AUTH_DELETE_KEY
:
3244 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3247 retval
= -ENOPROTOOPT
;
3251 sctp_release_sock(sk
);
3257 /* API 3.1.6 connect() - UDP Style Syntax
3259 * An application may use the connect() call in the UDP model to initiate an
3260 * association without sending data.
3264 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3266 * sd: the socket descriptor to have a new association added to.
3268 * nam: the address structure (either struct sockaddr_in or struct
3269 * sockaddr_in6 defined in RFC2553 [7]).
3271 * len: the size of the address.
3273 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3281 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3282 __FUNCTION__
, sk
, addr
, addr_len
);
3284 /* Validate addr_len before calling common connect/connectx routine. */
3285 af
= sctp_get_af_specific(addr
->sa_family
);
3286 if (!af
|| addr_len
< af
->sockaddr_len
) {
3289 /* Pass correct addr len to common routine (so it knows there
3290 * is only one address being passed.
3292 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
);
3295 sctp_release_sock(sk
);
3299 /* FIXME: Write comments. */
3300 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
3302 return -EOPNOTSUPP
; /* STUB */
3305 /* 4.1.4 accept() - TCP Style Syntax
3307 * Applications use accept() call to remove an established SCTP
3308 * association from the accept queue of the endpoint. A new socket
3309 * descriptor will be returned from accept() to represent the newly
3310 * formed association.
3312 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3314 struct sctp_sock
*sp
;
3315 struct sctp_endpoint
*ep
;
3316 struct sock
*newsk
= NULL
;
3317 struct sctp_association
*asoc
;
3326 if (!sctp_style(sk
, TCP
)) {
3327 error
= -EOPNOTSUPP
;
3331 if (!sctp_sstate(sk
, LISTENING
)) {
3336 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3338 error
= sctp_wait_for_accept(sk
, timeo
);
3342 /* We treat the list of associations on the endpoint as the accept
3343 * queue and pick the first association on the list.
3345 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3347 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3353 /* Populate the fields of the newsk from the oldsk and migrate the
3354 * asoc to the newsk.
3356 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3359 sctp_release_sock(sk
);
3364 /* The SCTP ioctl handler. */
3365 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3367 return -ENOIOCTLCMD
;
3370 /* This is the function which gets called during socket creation to
3371 * initialized the SCTP-specific portion of the sock.
3372 * The sock structure should already be zero-filled memory.
3374 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
3376 struct sctp_endpoint
*ep
;
3377 struct sctp_sock
*sp
;
3379 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3383 /* Initialize the SCTP per socket area. */
3384 switch (sk
->sk_type
) {
3385 case SOCK_SEQPACKET
:
3386 sp
->type
= SCTP_SOCKET_UDP
;
3389 sp
->type
= SCTP_SOCKET_TCP
;
3392 return -ESOCKTNOSUPPORT
;
3395 /* Initialize default send parameters. These parameters can be
3396 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3398 sp
->default_stream
= 0;
3399 sp
->default_ppid
= 0;
3400 sp
->default_flags
= 0;
3401 sp
->default_context
= 0;
3402 sp
->default_timetolive
= 0;
3404 sp
->default_rcv_context
= 0;
3405 sp
->max_burst
= sctp_max_burst
;
3407 /* Initialize default setup parameters. These parameters
3408 * can be modified with the SCTP_INITMSG socket option or
3409 * overridden by the SCTP_INIT CMSG.
3411 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3412 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3413 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3414 sp
->initmsg
.sinit_max_init_timeo
= sctp_rto_max
;
3416 /* Initialize default RTO related parameters. These parameters can
3417 * be modified for with the SCTP_RTOINFO socket option.
3419 sp
->rtoinfo
.srto_initial
= sctp_rto_initial
;
3420 sp
->rtoinfo
.srto_max
= sctp_rto_max
;
3421 sp
->rtoinfo
.srto_min
= sctp_rto_min
;
3423 /* Initialize default association related parameters. These parameters
3424 * can be modified with the SCTP_ASSOCINFO socket option.
3426 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3427 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3428 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3429 sp
->assocparams
.sasoc_local_rwnd
= 0;
3430 sp
->assocparams
.sasoc_cookie_life
= sctp_valid_cookie_life
;
3432 /* Initialize default event subscriptions. By default, all the
3435 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3437 /* Default Peer Address Parameters. These defaults can
3438 * be modified via SCTP_PEER_ADDR_PARAMS
3440 sp
->hbinterval
= sctp_hb_interval
;
3441 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3442 sp
->pathmtu
= 0; // allow default discovery
3443 sp
->sackdelay
= sctp_sack_timeout
;
3444 sp
->param_flags
= SPP_HB_ENABLE
|
3446 SPP_SACKDELAY_ENABLE
;
3448 /* If enabled no SCTP message fragmentation will be performed.
3449 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3451 sp
->disable_fragments
= 0;
3453 /* Enable Nagle algorithm by default. */
3456 /* Enable by default. */
3459 /* Auto-close idle associations after the configured
3460 * number of seconds. A value of 0 disables this
3461 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3462 * for UDP-style sockets only.
3466 /* User specified fragmentation limit. */
3469 sp
->adaptation_ind
= 0;
3471 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3473 /* Control variables for partial data delivery. */
3474 atomic_set(&sp
->pd_mode
, 0);
3475 skb_queue_head_init(&sp
->pd_lobby
);
3476 sp
->frag_interleave
= 0;
3478 /* Create a per socket endpoint structure. Even if we
3479 * change the data structure relationships, this may still
3480 * be useful for storing pre-connect address information.
3482 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3489 SCTP_DBG_OBJCNT_INC(sock
);
3490 atomic_inc(&sctp_sockets_allocated
);
3494 /* Cleanup any SCTP per socket resources. */
3495 SCTP_STATIC
int sctp_destroy_sock(struct sock
*sk
)
3497 struct sctp_endpoint
*ep
;
3499 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3501 /* Release our hold on the endpoint. */
3502 ep
= sctp_sk(sk
)->ep
;
3503 sctp_endpoint_free(ep
);
3504 atomic_dec(&sctp_sockets_allocated
);
3508 /* API 4.1.7 shutdown() - TCP Style Syntax
3509 * int shutdown(int socket, int how);
3511 * sd - the socket descriptor of the association to be closed.
3512 * how - Specifies the type of shutdown. The values are
3515 * Disables further receive operations. No SCTP
3516 * protocol action is taken.
3518 * Disables further send operations, and initiates
3519 * the SCTP shutdown sequence.
3521 * Disables further send and receive operations
3522 * and initiates the SCTP shutdown sequence.
3524 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3526 struct sctp_endpoint
*ep
;
3527 struct sctp_association
*asoc
;
3529 if (!sctp_style(sk
, TCP
))
3532 if (how
& SEND_SHUTDOWN
) {
3533 ep
= sctp_sk(sk
)->ep
;
3534 if (!list_empty(&ep
->asocs
)) {
3535 asoc
= list_entry(ep
->asocs
.next
,
3536 struct sctp_association
, asocs
);
3537 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3542 /* 7.2.1 Association Status (SCTP_STATUS)
3544 * Applications can retrieve current status information about an
3545 * association, including association state, peer receiver window size,
3546 * number of unacked data chunks, and number of data chunks pending
3547 * receipt. This information is read-only.
3549 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3550 char __user
*optval
,
3553 struct sctp_status status
;
3554 struct sctp_association
*asoc
= NULL
;
3555 struct sctp_transport
*transport
;
3556 sctp_assoc_t associd
;
3559 if (len
< sizeof(status
)) {
3564 len
= sizeof(status
);
3565 if (copy_from_user(&status
, optval
, len
)) {
3570 associd
= status
.sstat_assoc_id
;
3571 asoc
= sctp_id2assoc(sk
, associd
);
3577 transport
= asoc
->peer
.primary_path
;
3579 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3580 status
.sstat_state
= asoc
->state
;
3581 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3582 status
.sstat_unackdata
= asoc
->unack_data
;
3584 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3585 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3586 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3587 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3588 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3589 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
3590 transport
->af_specific
->sockaddr_len
);
3591 /* Map ipv4 address into v4-mapped-on-v6 address. */
3592 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3593 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3594 status
.sstat_primary
.spinfo_state
= transport
->state
;
3595 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3596 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3597 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3598 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3600 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3601 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3603 if (put_user(len
, optlen
)) {
3608 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3609 len
, status
.sstat_state
, status
.sstat_rwnd
,
3610 status
.sstat_assoc_id
);
3612 if (copy_to_user(optval
, &status
, len
)) {
3622 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3624 * Applications can retrieve information about a specific peer address
3625 * of an association, including its reachability state, congestion
3626 * window, and retransmission timer values. This information is
3629 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3630 char __user
*optval
,
3633 struct sctp_paddrinfo pinfo
;
3634 struct sctp_transport
*transport
;
3637 if (len
< sizeof(pinfo
)) {
3642 len
= sizeof(pinfo
);
3643 if (copy_from_user(&pinfo
, optval
, len
)) {
3648 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3649 pinfo
.spinfo_assoc_id
);
3653 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3654 pinfo
.spinfo_state
= transport
->state
;
3655 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3656 pinfo
.spinfo_srtt
= transport
->srtt
;
3657 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3658 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3660 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3661 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3663 if (put_user(len
, optlen
)) {
3668 if (copy_to_user(optval
, &pinfo
, len
)) {
3677 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3679 * This option is a on/off flag. If enabled no SCTP message
3680 * fragmentation will be performed. Instead if a message being sent
3681 * exceeds the current PMTU size, the message will NOT be sent and
3682 * instead a error will be indicated to the user.
3684 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3685 char __user
*optval
, int __user
*optlen
)
3689 if (len
< sizeof(int))
3693 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3694 if (put_user(len
, optlen
))
3696 if (copy_to_user(optval
, &val
, len
))
3701 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3703 * This socket option is used to specify various notifications and
3704 * ancillary data the user wishes to receive.
3706 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
3709 if (len
< sizeof(struct sctp_event_subscribe
))
3711 len
= sizeof(struct sctp_event_subscribe
);
3712 if (put_user(len
, optlen
))
3714 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
3719 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3721 * This socket option is applicable to the UDP-style socket only. When
3722 * set it will cause associations that are idle for more than the
3723 * specified number of seconds to automatically close. An association
3724 * being idle is defined an association that has NOT sent or received
3725 * user data. The special value of '0' indicates that no automatic
3726 * close of any associations should be performed. The option expects an
3727 * integer defining the number of seconds of idle time before an
3728 * association is closed.
3730 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3732 /* Applicable to UDP-style socket only */
3733 if (sctp_style(sk
, TCP
))
3735 if (len
< sizeof(int))
3738 if (put_user(len
, optlen
))
3740 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
3745 /* Helper routine to branch off an association to a new socket. */
3746 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3747 struct socket
**sockp
)
3749 struct sock
*sk
= asoc
->base
.sk
;
3750 struct socket
*sock
;
3751 struct inet_sock
*inetsk
;
3755 /* An association cannot be branched off from an already peeled-off
3756 * socket, nor is this supported for tcp style sockets.
3758 if (!sctp_style(sk
, UDP
))
3761 /* Create a new socket. */
3762 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
3766 /* Populate the fields of the newsk from the oldsk and migrate the
3767 * asoc to the newsk.
3769 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
3771 /* Make peeled-off sockets more like 1-1 accepted sockets.
3772 * Set the daddr and initialize id to something more random
3774 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
3775 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
3776 inetsk
= inet_sk(sock
->sk
);
3777 inetsk
->id
= asoc
->next_tsn
^ jiffies
;
3784 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3786 sctp_peeloff_arg_t peeloff
;
3787 struct socket
*newsock
;
3789 struct sctp_association
*asoc
;
3791 if (len
< sizeof(sctp_peeloff_arg_t
))
3793 len
= sizeof(sctp_peeloff_arg_t
);
3794 if (copy_from_user(&peeloff
, optval
, len
))
3797 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
3803 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __FUNCTION__
, sk
, asoc
);
3805 retval
= sctp_do_peeloff(asoc
, &newsock
);
3809 /* Map the socket to an unused fd that can be returned to the user. */
3810 retval
= sock_map_fd(newsock
);
3812 sock_release(newsock
);
3816 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3817 __FUNCTION__
, sk
, asoc
, newsock
->sk
, retval
);
3819 /* Return the fd mapped to the new socket. */
3820 peeloff
.sd
= retval
;
3821 if (put_user(len
, optlen
))
3823 if (copy_to_user(optval
, &peeloff
, len
))
3830 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3832 * Applications can enable or disable heartbeats for any peer address of
3833 * an association, modify an address's heartbeat interval, force a
3834 * heartbeat to be sent immediately, and adjust the address's maximum
3835 * number of retransmissions sent before an address is considered
3836 * unreachable. The following structure is used to access and modify an
3837 * address's parameters:
3839 * struct sctp_paddrparams {
3840 * sctp_assoc_t spp_assoc_id;
3841 * struct sockaddr_storage spp_address;
3842 * uint32_t spp_hbinterval;
3843 * uint16_t spp_pathmaxrxt;
3844 * uint32_t spp_pathmtu;
3845 * uint32_t spp_sackdelay;
3846 * uint32_t spp_flags;
3849 * spp_assoc_id - (one-to-many style socket) This is filled in the
3850 * application, and identifies the association for
3852 * spp_address - This specifies which address is of interest.
3853 * spp_hbinterval - This contains the value of the heartbeat interval,
3854 * in milliseconds. If a value of zero
3855 * is present in this field then no changes are to
3856 * be made to this parameter.
3857 * spp_pathmaxrxt - This contains the maximum number of
3858 * retransmissions before this address shall be
3859 * considered unreachable. If a value of zero
3860 * is present in this field then no changes are to
3861 * be made to this parameter.
3862 * spp_pathmtu - When Path MTU discovery is disabled the value
3863 * specified here will be the "fixed" path mtu.
3864 * Note that if the spp_address field is empty
3865 * then all associations on this address will
3866 * have this fixed path mtu set upon them.
3868 * spp_sackdelay - When delayed sack is enabled, this value specifies
3869 * the number of milliseconds that sacks will be delayed
3870 * for. This value will apply to all addresses of an
3871 * association if the spp_address field is empty. Note
3872 * also, that if delayed sack is enabled and this
3873 * value is set to 0, no change is made to the last
3874 * recorded delayed sack timer value.
3876 * spp_flags - These flags are used to control various features
3877 * on an association. The flag field may contain
3878 * zero or more of the following options.
3880 * SPP_HB_ENABLE - Enable heartbeats on the
3881 * specified address. Note that if the address
3882 * field is empty all addresses for the association
3883 * have heartbeats enabled upon them.
3885 * SPP_HB_DISABLE - Disable heartbeats on the
3886 * speicifed address. Note that if the address
3887 * field is empty all addresses for the association
3888 * will have their heartbeats disabled. Note also
3889 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
3890 * mutually exclusive, only one of these two should
3891 * be specified. Enabling both fields will have
3892 * undetermined results.
3894 * SPP_HB_DEMAND - Request a user initiated heartbeat
3895 * to be made immediately.
3897 * SPP_PMTUD_ENABLE - This field will enable PMTU
3898 * discovery upon the specified address. Note that
3899 * if the address feild is empty then all addresses
3900 * on the association are effected.
3902 * SPP_PMTUD_DISABLE - This field will disable PMTU
3903 * discovery upon the specified address. Note that
3904 * if the address feild is empty then all addresses
3905 * on the association are effected. Not also that
3906 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
3907 * exclusive. Enabling both will have undetermined
3910 * SPP_SACKDELAY_ENABLE - Setting this flag turns
3911 * on delayed sack. The time specified in spp_sackdelay
3912 * is used to specify the sack delay for this address. Note
3913 * that if spp_address is empty then all addresses will
3914 * enable delayed sack and take on the sack delay
3915 * value specified in spp_sackdelay.
3916 * SPP_SACKDELAY_DISABLE - Setting this flag turns
3917 * off delayed sack. If the spp_address field is blank then
3918 * delayed sack is disabled for the entire association. Note
3919 * also that this field is mutually exclusive to
3920 * SPP_SACKDELAY_ENABLE, setting both will have undefined
3923 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
3924 char __user
*optval
, int __user
*optlen
)
3926 struct sctp_paddrparams params
;
3927 struct sctp_transport
*trans
= NULL
;
3928 struct sctp_association
*asoc
= NULL
;
3929 struct sctp_sock
*sp
= sctp_sk(sk
);
3931 if (len
< sizeof(struct sctp_paddrparams
))
3933 len
= sizeof(struct sctp_paddrparams
);
3934 if (copy_from_user(¶ms
, optval
, len
))
3937 /* If an address other than INADDR_ANY is specified, and
3938 * no transport is found, then the request is invalid.
3940 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
3941 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
3942 params
.spp_assoc_id
);
3944 SCTP_DEBUG_PRINTK("Failed no transport\n");
3949 /* Get association, if assoc_id != 0 and the socket is a one
3950 * to many style socket, and an association was not found, then
3951 * the id was invalid.
3953 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
3954 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
3955 SCTP_DEBUG_PRINTK("Failed no association\n");
3960 /* Fetch transport values. */
3961 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
3962 params
.spp_pathmtu
= trans
->pathmtu
;
3963 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
3964 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
3966 /*draft-11 doesn't say what to return in spp_flags*/
3967 params
.spp_flags
= trans
->param_flags
;
3969 /* Fetch association values. */
3970 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
3971 params
.spp_pathmtu
= asoc
->pathmtu
;
3972 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
3973 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
3975 /*draft-11 doesn't say what to return in spp_flags*/
3976 params
.spp_flags
= asoc
->param_flags
;
3978 /* Fetch socket values. */
3979 params
.spp_hbinterval
= sp
->hbinterval
;
3980 params
.spp_pathmtu
= sp
->pathmtu
;
3981 params
.spp_sackdelay
= sp
->sackdelay
;
3982 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
3984 /*draft-11 doesn't say what to return in spp_flags*/
3985 params
.spp_flags
= sp
->param_flags
;
3988 if (copy_to_user(optval
, ¶ms
, len
))
3991 if (put_user(len
, optlen
))
3997 /* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
3999 * This options will get or set the delayed ack timer. The time is set
4000 * in milliseconds. If the assoc_id is 0, then this sets or gets the
4001 * endpoints default delayed ack timer value. If the assoc_id field is
4002 * non-zero, then the set or get effects the specified association.
4004 * struct sctp_assoc_value {
4005 * sctp_assoc_t assoc_id;
4006 * uint32_t assoc_value;
4009 * assoc_id - This parameter, indicates which association the
4010 * user is preforming an action upon. Note that if
4011 * this field's value is zero then the endpoints
4012 * default value is changed (effecting future
4013 * associations only).
4015 * assoc_value - This parameter contains the number of milliseconds
4016 * that the user is requesting the delayed ACK timer
4017 * be set to. Note that this value is defined in
4018 * the standard to be between 200 and 500 milliseconds.
4020 * Note: a value of zero will leave the value alone,
4021 * but disable SACK delay. A non-zero value will also
4022 * enable SACK delay.
4024 static int sctp_getsockopt_delayed_ack_time(struct sock
*sk
, int len
,
4025 char __user
*optval
,
4028 struct sctp_assoc_value params
;
4029 struct sctp_association
*asoc
= NULL
;
4030 struct sctp_sock
*sp
= sctp_sk(sk
);
4032 if (len
< sizeof(struct sctp_assoc_value
))
4035 len
= sizeof(struct sctp_assoc_value
);
4037 if (copy_from_user(¶ms
, optval
, len
))
4040 /* Get association, if assoc_id != 0 and the socket is a one
4041 * to many style socket, and an association was not found, then
4042 * the id was invalid.
4044 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4045 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
4049 /* Fetch association values. */
4050 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
)
4051 params
.assoc_value
= jiffies_to_msecs(
4054 params
.assoc_value
= 0;
4056 /* Fetch socket values. */
4057 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
)
4058 params
.assoc_value
= sp
->sackdelay
;
4060 params
.assoc_value
= 0;
4063 if (copy_to_user(optval
, ¶ms
, len
))
4066 if (put_user(len
, optlen
))
4072 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4074 * Applications can specify protocol parameters for the default association
4075 * initialization. The option name argument to setsockopt() and getsockopt()
4078 * Setting initialization parameters is effective only on an unconnected
4079 * socket (for UDP-style sockets only future associations are effected
4080 * by the change). With TCP-style sockets, this option is inherited by
4081 * sockets derived from a listener socket.
4083 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4085 if (len
< sizeof(struct sctp_initmsg
))
4087 len
= sizeof(struct sctp_initmsg
);
4088 if (put_user(len
, optlen
))
4090 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
4095 static int sctp_getsockopt_peer_addrs_num_old(struct sock
*sk
, int len
,
4096 char __user
*optval
,
4100 struct sctp_association
*asoc
;
4101 struct list_head
*pos
;
4104 if (len
< sizeof(sctp_assoc_t
))
4107 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
4110 /* For UDP-style sockets, id specifies the association to query. */
4111 asoc
= sctp_id2assoc(sk
, id
);
4115 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4123 * Old API for getting list of peer addresses. Does not work for 32-bit
4124 * programs running on a 64-bit kernel
4126 static int sctp_getsockopt_peer_addrs_old(struct sock
*sk
, int len
,
4127 char __user
*optval
,
4130 struct sctp_association
*asoc
;
4131 struct list_head
*pos
;
4133 struct sctp_getaddrs_old getaddrs
;
4134 struct sctp_transport
*from
;
4136 union sctp_addr temp
;
4137 struct sctp_sock
*sp
= sctp_sk(sk
);
4140 if (len
< sizeof(struct sctp_getaddrs_old
))
4143 len
= sizeof(struct sctp_getaddrs_old
);
4145 if (copy_from_user(&getaddrs
, optval
, len
))
4148 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
4150 /* For UDP-style sockets, id specifies the association to query. */
4151 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4155 to
= (void __user
*)getaddrs
.addrs
;
4156 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4157 from
= list_entry(pos
, struct sctp_transport
, transports
);
4158 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4159 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4160 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
4161 if (copy_to_user(to
, &temp
, addrlen
))
4165 if (cnt
>= getaddrs
.addr_num
) break;
4167 getaddrs
.addr_num
= cnt
;
4168 if (put_user(len
, optlen
))
4170 if (copy_to_user(optval
, &getaddrs
, len
))
4176 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4177 char __user
*optval
, int __user
*optlen
)
4179 struct sctp_association
*asoc
;
4180 struct list_head
*pos
;
4182 struct sctp_getaddrs getaddrs
;
4183 struct sctp_transport
*from
;
4185 union sctp_addr temp
;
4186 struct sctp_sock
*sp
= sctp_sk(sk
);
4191 if (len
< sizeof(struct sctp_getaddrs
))
4194 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4197 /* For UDP-style sockets, id specifies the association to query. */
4198 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4202 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4203 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4205 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4206 from
= list_entry(pos
, struct sctp_transport
, transports
);
4207 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4208 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4209 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
4210 if (space_left
< addrlen
)
4212 if (copy_to_user(to
, &temp
, addrlen
))
4216 space_left
-= addrlen
;
4219 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4221 bytes_copied
= ((char __user
*)to
) - optval
;
4222 if (put_user(bytes_copied
, optlen
))
4228 static int sctp_getsockopt_local_addrs_num_old(struct sock
*sk
, int len
,
4229 char __user
*optval
,
4233 struct sctp_bind_addr
*bp
;
4234 struct sctp_association
*asoc
;
4235 struct sctp_sockaddr_entry
*addr
;
4238 if (len
< sizeof(sctp_assoc_t
))
4241 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
4245 * For UDP-style sockets, id specifies the association to query.
4246 * If the id field is set to the value '0' then the locally bound
4247 * addresses are returned without regard to any particular
4251 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4253 asoc
= sctp_id2assoc(sk
, id
);
4256 bp
= &asoc
->base
.bind_addr
;
4259 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
4260 * addresses from the global local address list.
4262 if (sctp_list_single_entry(&bp
->address_list
)) {
4263 addr
= list_entry(bp
->address_list
.next
,
4264 struct sctp_sockaddr_entry
, list
);
4265 if (sctp_is_any(&addr
->a
)) {
4267 list_for_each_entry_rcu(addr
,
4268 &sctp_local_addr_list
, list
) {
4272 if ((PF_INET
== sk
->sk_family
) &&
4273 (AF_INET6
== addr
->a
.sa
.sa_family
))
4285 /* Protection on the bound address list is not needed,
4286 * since in the socket option context we hold the socket lock,
4287 * so there is no way that the bound address list can change.
4289 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4296 /* Helper function that copies local addresses to user and returns the number
4297 * of addresses copied.
4299 static int sctp_copy_laddrs_old(struct sock
*sk
, __u16 port
,
4300 int max_addrs
, void *to
,
4303 struct sctp_sockaddr_entry
*addr
;
4304 union sctp_addr temp
;
4309 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
4313 if ((PF_INET
== sk
->sk_family
) &&
4314 (AF_INET6
== addr
->a
.sa
.sa_family
))
4316 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4317 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4319 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4320 memcpy(to
, &temp
, addrlen
);
4323 *bytes_copied
+= addrlen
;
4325 if (cnt
>= max_addrs
) break;
4332 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4333 size_t space_left
, int *bytes_copied
)
4335 struct sctp_sockaddr_entry
*addr
;
4336 union sctp_addr temp
;
4341 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
4345 if ((PF_INET
== sk
->sk_family
) &&
4346 (AF_INET6
== addr
->a
.sa
.sa_family
))
4348 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4349 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4351 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4352 if (space_left
< addrlen
) {
4356 memcpy(to
, &temp
, addrlen
);
4360 space_left
-= addrlen
;
4361 *bytes_copied
+= addrlen
;
4368 /* Old API for getting list of local addresses. Does not work for 32-bit
4369 * programs running on a 64-bit kernel
4371 static int sctp_getsockopt_local_addrs_old(struct sock
*sk
, int len
,
4372 char __user
*optval
, int __user
*optlen
)
4374 struct sctp_bind_addr
*bp
;
4375 struct sctp_association
*asoc
;
4377 struct sctp_getaddrs_old getaddrs
;
4378 struct sctp_sockaddr_entry
*addr
;
4380 union sctp_addr temp
;
4381 struct sctp_sock
*sp
= sctp_sk(sk
);
4386 int bytes_copied
= 0;
4388 if (len
< sizeof(struct sctp_getaddrs_old
))
4391 len
= sizeof(struct sctp_getaddrs_old
);
4392 if (copy_from_user(&getaddrs
, optval
, len
))
4395 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
4397 * For UDP-style sockets, id specifies the association to query.
4398 * If the id field is set to the value '0' then the locally bound
4399 * addresses are returned without regard to any particular
4402 if (0 == getaddrs
.assoc_id
) {
4403 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4405 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4408 bp
= &asoc
->base
.bind_addr
;
4411 to
= getaddrs
.addrs
;
4413 /* Allocate space for a local instance of packed array to hold all
4414 * the data. We store addresses here first and then put write them
4415 * to the user in one shot.
4417 addrs
= kmalloc(sizeof(union sctp_addr
) * getaddrs
.addr_num
,
4422 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4423 * addresses from the global local address list.
4425 if (sctp_list_single_entry(&bp
->address_list
)) {
4426 addr
= list_entry(bp
->address_list
.next
,
4427 struct sctp_sockaddr_entry
, list
);
4428 if (sctp_is_any(&addr
->a
)) {
4429 cnt
= sctp_copy_laddrs_old(sk
, bp
->port
,
4431 addrs
, &bytes_copied
);
4437 /* Protection on the bound address list is not needed since
4438 * in the socket option context we hold a socket lock and
4439 * thus the bound address list can't change.
4441 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4442 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4443 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4444 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4445 memcpy(buf
, &temp
, addrlen
);
4447 bytes_copied
+= addrlen
;
4449 if (cnt
>= getaddrs
.addr_num
) break;
4453 /* copy the entire address list into the user provided space */
4454 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4459 /* copy the leading structure back to user */
4460 getaddrs
.addr_num
= cnt
;
4461 if (copy_to_user(optval
, &getaddrs
, len
))
4469 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4470 char __user
*optval
, int __user
*optlen
)
4472 struct sctp_bind_addr
*bp
;
4473 struct sctp_association
*asoc
;
4475 struct sctp_getaddrs getaddrs
;
4476 struct sctp_sockaddr_entry
*addr
;
4478 union sctp_addr temp
;
4479 struct sctp_sock
*sp
= sctp_sk(sk
);
4483 int bytes_copied
= 0;
4487 if (len
< sizeof(struct sctp_getaddrs
))
4490 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4494 * For UDP-style sockets, id specifies the association to query.
4495 * If the id field is set to the value '0' then the locally bound
4496 * addresses are returned without regard to any particular
4499 if (0 == getaddrs
.assoc_id
) {
4500 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4502 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4505 bp
= &asoc
->base
.bind_addr
;
4508 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4509 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4511 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4515 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4516 * addresses from the global local address list.
4518 if (sctp_list_single_entry(&bp
->address_list
)) {
4519 addr
= list_entry(bp
->address_list
.next
,
4520 struct sctp_sockaddr_entry
, list
);
4521 if (sctp_is_any(&addr
->a
)) {
4522 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4523 space_left
, &bytes_copied
);
4533 /* Protection on the bound address list is not needed since
4534 * in the socket option context we hold a socket lock and
4535 * thus the bound address list can't change.
4537 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4538 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4539 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4540 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4541 if (space_left
< addrlen
) {
4542 err
= -ENOMEM
; /*fixme: right error?*/
4545 memcpy(buf
, &temp
, addrlen
);
4547 bytes_copied
+= addrlen
;
4549 space_left
-= addrlen
;
4553 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4557 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4561 if (put_user(bytes_copied
, optlen
))
4568 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4570 * Requests that the local SCTP stack use the enclosed peer address as
4571 * the association primary. The enclosed address must be one of the
4572 * association peer's addresses.
4574 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4575 char __user
*optval
, int __user
*optlen
)
4577 struct sctp_prim prim
;
4578 struct sctp_association
*asoc
;
4579 struct sctp_sock
*sp
= sctp_sk(sk
);
4581 if (len
< sizeof(struct sctp_prim
))
4584 len
= sizeof(struct sctp_prim
);
4586 if (copy_from_user(&prim
, optval
, len
))
4589 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4593 if (!asoc
->peer
.primary_path
)
4596 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4597 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4599 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4600 (union sctp_addr
*)&prim
.ssp_addr
);
4602 if (put_user(len
, optlen
))
4604 if (copy_to_user(optval
, &prim
, len
))
4611 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4613 * Requests that the local endpoint set the specified Adaptation Layer
4614 * Indication parameter for all future INIT and INIT-ACK exchanges.
4616 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4617 char __user
*optval
, int __user
*optlen
)
4619 struct sctp_setadaptation adaptation
;
4621 if (len
< sizeof(struct sctp_setadaptation
))
4624 len
= sizeof(struct sctp_setadaptation
);
4626 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4628 if (put_user(len
, optlen
))
4630 if (copy_to_user(optval
, &adaptation
, len
))
4638 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4640 * Applications that wish to use the sendto() system call may wish to
4641 * specify a default set of parameters that would normally be supplied
4642 * through the inclusion of ancillary data. This socket option allows
4643 * such an application to set the default sctp_sndrcvinfo structure.
4646 * The application that wishes to use this socket option simply passes
4647 * in to this call the sctp_sndrcvinfo structure defined in Section
4648 * 5.2.2) The input parameters accepted by this call include
4649 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4650 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4651 * to this call if the caller is using the UDP model.
4653 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4655 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4656 int len
, char __user
*optval
,
4659 struct sctp_sndrcvinfo info
;
4660 struct sctp_association
*asoc
;
4661 struct sctp_sock
*sp
= sctp_sk(sk
);
4663 if (len
< sizeof(struct sctp_sndrcvinfo
))
4666 len
= sizeof(struct sctp_sndrcvinfo
);
4668 if (copy_from_user(&info
, optval
, len
))
4671 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4672 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4676 info
.sinfo_stream
= asoc
->default_stream
;
4677 info
.sinfo_flags
= asoc
->default_flags
;
4678 info
.sinfo_ppid
= asoc
->default_ppid
;
4679 info
.sinfo_context
= asoc
->default_context
;
4680 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4682 info
.sinfo_stream
= sp
->default_stream
;
4683 info
.sinfo_flags
= sp
->default_flags
;
4684 info
.sinfo_ppid
= sp
->default_ppid
;
4685 info
.sinfo_context
= sp
->default_context
;
4686 info
.sinfo_timetolive
= sp
->default_timetolive
;
4689 if (put_user(len
, optlen
))
4691 if (copy_to_user(optval
, &info
, len
))
4699 * 7.1.5 SCTP_NODELAY
4701 * Turn on/off any Nagle-like algorithm. This means that packets are
4702 * generally sent as soon as possible and no unnecessary delays are
4703 * introduced, at the cost of more packets in the network. Expects an
4704 * integer boolean flag.
4707 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4708 char __user
*optval
, int __user
*optlen
)
4712 if (len
< sizeof(int))
4716 val
= (sctp_sk(sk
)->nodelay
== 1);
4717 if (put_user(len
, optlen
))
4719 if (copy_to_user(optval
, &val
, len
))
4726 * 7.1.1 SCTP_RTOINFO
4728 * The protocol parameters used to initialize and bound retransmission
4729 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4730 * and modify these parameters.
4731 * All parameters are time values, in milliseconds. A value of 0, when
4732 * modifying the parameters, indicates that the current value should not
4736 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4737 char __user
*optval
,
4738 int __user
*optlen
) {
4739 struct sctp_rtoinfo rtoinfo
;
4740 struct sctp_association
*asoc
;
4742 if (len
< sizeof (struct sctp_rtoinfo
))
4745 len
= sizeof(struct sctp_rtoinfo
);
4747 if (copy_from_user(&rtoinfo
, optval
, len
))
4750 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4752 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4755 /* Values corresponding to the specific association. */
4757 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4758 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4759 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4761 /* Values corresponding to the endpoint. */
4762 struct sctp_sock
*sp
= sctp_sk(sk
);
4764 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4765 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4766 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4769 if (put_user(len
, optlen
))
4772 if (copy_to_user(optval
, &rtoinfo
, len
))
4780 * 7.1.2 SCTP_ASSOCINFO
4782 * This option is used to tune the maximum retransmission attempts
4783 * of the association.
4784 * Returns an error if the new association retransmission value is
4785 * greater than the sum of the retransmission value of the peer.
4786 * See [SCTP] for more information.
4789 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4790 char __user
*optval
,
4794 struct sctp_assocparams assocparams
;
4795 struct sctp_association
*asoc
;
4796 struct list_head
*pos
;
4799 if (len
< sizeof (struct sctp_assocparams
))
4802 len
= sizeof(struct sctp_assocparams
);
4804 if (copy_from_user(&assocparams
, optval
, len
))
4807 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4809 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4812 /* Values correspoinding to the specific association */
4814 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4815 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4816 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4817 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4819 (asoc
->cookie_life
.tv_usec
4822 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4826 assocparams
.sasoc_number_peer_destinations
= cnt
;
4828 /* Values corresponding to the endpoint */
4829 struct sctp_sock
*sp
= sctp_sk(sk
);
4831 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4832 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4833 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4834 assocparams
.sasoc_cookie_life
=
4835 sp
->assocparams
.sasoc_cookie_life
;
4836 assocparams
.sasoc_number_peer_destinations
=
4838 sasoc_number_peer_destinations
;
4841 if (put_user(len
, optlen
))
4844 if (copy_to_user(optval
, &assocparams
, len
))
4851 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4853 * This socket option is a boolean flag which turns on or off mapped V4
4854 * addresses. If this option is turned on and the socket is type
4855 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4856 * If this option is turned off, then no mapping will be done of V4
4857 * addresses and a user will receive both PF_INET6 and PF_INET type
4858 * addresses on the socket.
4860 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
4861 char __user
*optval
, int __user
*optlen
)
4864 struct sctp_sock
*sp
= sctp_sk(sk
);
4866 if (len
< sizeof(int))
4871 if (put_user(len
, optlen
))
4873 if (copy_to_user(optval
, &val
, len
))
4880 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
4881 * (chapter and verse is quoted at sctp_setsockopt_context())
4883 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
4884 char __user
*optval
, int __user
*optlen
)
4886 struct sctp_assoc_value params
;
4887 struct sctp_sock
*sp
;
4888 struct sctp_association
*asoc
;
4890 if (len
< sizeof(struct sctp_assoc_value
))
4893 len
= sizeof(struct sctp_assoc_value
);
4895 if (copy_from_user(¶ms
, optval
, len
))
4900 if (params
.assoc_id
!= 0) {
4901 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4904 params
.assoc_value
= asoc
->default_rcv_context
;
4906 params
.assoc_value
= sp
->default_rcv_context
;
4909 if (put_user(len
, optlen
))
4911 if (copy_to_user(optval
, ¶ms
, len
))
4918 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
4920 * This socket option specifies the maximum size to put in any outgoing
4921 * SCTP chunk. If a message is larger than this size it will be
4922 * fragmented by SCTP into the specified size. Note that the underlying
4923 * SCTP implementation may fragment into smaller sized chunks when the
4924 * PMTU of the underlying association is smaller than the value set by
4927 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
4928 char __user
*optval
, int __user
*optlen
)
4932 if (len
< sizeof(int))
4937 val
= sctp_sk(sk
)->user_frag
;
4938 if (put_user(len
, optlen
))
4940 if (copy_to_user(optval
, &val
, len
))
4947 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
4948 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
4950 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
4951 char __user
*optval
, int __user
*optlen
)
4955 if (len
< sizeof(int))
4960 val
= sctp_sk(sk
)->frag_interleave
;
4961 if (put_user(len
, optlen
))
4963 if (copy_to_user(optval
, &val
, len
))
4970 * 7.1.25. Set or Get the sctp partial delivery point
4971 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
4973 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
4974 char __user
*optval
,
4979 if (len
< sizeof(u32
))
4984 val
= sctp_sk(sk
)->pd_point
;
4985 if (put_user(len
, optlen
))
4987 if (copy_to_user(optval
, &val
, len
))
4994 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
4995 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
4997 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
4998 char __user
*optval
,
5003 if (len
< sizeof(int))
5008 val
= sctp_sk(sk
)->max_burst
;
5009 if (put_user(len
, optlen
))
5011 if (copy_to_user(optval
, &val
, len
))
5017 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5018 char __user
*optval
, int __user
*optlen
)
5020 struct sctp_hmac_algo_param
*hmacs
;
5023 hmacs
= sctp_sk(sk
)->ep
->auth_hmacs_list
;
5024 param_len
= ntohs(hmacs
->param_hdr
.length
);
5026 if (len
< param_len
)
5028 if (put_user(len
, optlen
))
5030 if (copy_to_user(optval
, hmacs
->hmac_ids
, len
))
5036 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5037 char __user
*optval
, int __user
*optlen
)
5039 struct sctp_authkeyid val
;
5040 struct sctp_association
*asoc
;
5042 if (len
< sizeof(struct sctp_authkeyid
))
5044 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5047 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5048 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5052 val
.scact_keynumber
= asoc
->active_key_id
;
5054 val
.scact_keynumber
= sctp_sk(sk
)->ep
->active_key_id
;
5059 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5060 char __user
*optval
, int __user
*optlen
)
5062 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5063 struct sctp_authchunks val
;
5064 struct sctp_association
*asoc
;
5065 struct sctp_chunks_param
*ch
;
5068 if (len
<= sizeof(struct sctp_authchunks
))
5071 if (copy_from_user(&val
, p
, sizeof(struct sctp_authchunks
)))
5074 to
= p
->gauth_chunks
;
5075 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5079 ch
= asoc
->peer
.peer_chunks
;
5081 /* See if the user provided enough room for all the data */
5082 if (len
< ntohs(ch
->param_hdr
.length
))
5085 len
= ntohs(ch
->param_hdr
.length
);
5086 if (put_user(len
, optlen
))
5088 if (copy_to_user(to
, ch
->chunks
, len
))
5094 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
5095 char __user
*optval
, int __user
*optlen
)
5097 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5098 struct sctp_authchunks val
;
5099 struct sctp_association
*asoc
;
5100 struct sctp_chunks_param
*ch
;
5103 if (len
<= sizeof(struct sctp_authchunks
))
5106 if (copy_from_user(&val
, p
, sizeof(struct sctp_authchunks
)))
5109 to
= p
->gauth_chunks
;
5110 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5111 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
5115 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
5117 ch
= sctp_sk(sk
)->ep
->auth_chunk_list
;
5119 if (len
< ntohs(ch
->param_hdr
.length
))
5122 len
= ntohs(ch
->param_hdr
.length
);
5123 if (put_user(len
, optlen
))
5125 if (copy_to_user(to
, ch
->chunks
, len
))
5131 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
5132 char __user
*optval
, int __user
*optlen
)
5137 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5140 /* I can hardly begin to describe how wrong this is. This is
5141 * so broken as to be worse than useless. The API draft
5142 * REALLY is NOT helpful here... I am not convinced that the
5143 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5144 * are at all well-founded.
5146 if (level
!= SOL_SCTP
) {
5147 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5149 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
5153 if (get_user(len
, optlen
))
5160 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
5162 case SCTP_DISABLE_FRAGMENTS
:
5163 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
5167 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
5169 case SCTP_AUTOCLOSE
:
5170 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
5172 case SCTP_SOCKOPT_PEELOFF
:
5173 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
5175 case SCTP_PEER_ADDR_PARAMS
:
5176 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
5179 case SCTP_DELAYED_ACK_TIME
:
5180 retval
= sctp_getsockopt_delayed_ack_time(sk
, len
, optval
,
5184 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
5186 case SCTP_GET_PEER_ADDRS_NUM_OLD
:
5187 retval
= sctp_getsockopt_peer_addrs_num_old(sk
, len
, optval
,
5190 case SCTP_GET_LOCAL_ADDRS_NUM_OLD
:
5191 retval
= sctp_getsockopt_local_addrs_num_old(sk
, len
, optval
,
5194 case SCTP_GET_PEER_ADDRS_OLD
:
5195 retval
= sctp_getsockopt_peer_addrs_old(sk
, len
, optval
,
5198 case SCTP_GET_LOCAL_ADDRS_OLD
:
5199 retval
= sctp_getsockopt_local_addrs_old(sk
, len
, optval
,
5202 case SCTP_GET_PEER_ADDRS
:
5203 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
5206 case SCTP_GET_LOCAL_ADDRS
:
5207 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
5210 case SCTP_DEFAULT_SEND_PARAM
:
5211 retval
= sctp_getsockopt_default_send_param(sk
, len
,
5214 case SCTP_PRIMARY_ADDR
:
5215 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
5218 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
5221 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
5223 case SCTP_ASSOCINFO
:
5224 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
5226 case SCTP_I_WANT_MAPPED_V4_ADDR
:
5227 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
5230 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
5232 case SCTP_GET_PEER_ADDR_INFO
:
5233 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
5236 case SCTP_ADAPTATION_LAYER
:
5237 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
5241 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
5243 case SCTP_FRAGMENT_INTERLEAVE
:
5244 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
5247 case SCTP_PARTIAL_DELIVERY_POINT
:
5248 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
5251 case SCTP_MAX_BURST
:
5252 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
5255 case SCTP_AUTH_CHUNK
:
5256 case SCTP_AUTH_DELETE_KEY
:
5257 retval
= -EOPNOTSUPP
;
5259 case SCTP_HMAC_IDENT
:
5260 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
5262 case SCTP_AUTH_ACTIVE_KEY
:
5263 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
5265 case SCTP_PEER_AUTH_CHUNKS
:
5266 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
5269 case SCTP_LOCAL_AUTH_CHUNKS
:
5270 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
5274 retval
= -ENOPROTOOPT
;
5278 sctp_release_sock(sk
);
5282 static void sctp_hash(struct sock
*sk
)
5287 static void sctp_unhash(struct sock
*sk
)
5292 /* Check if port is acceptable. Possibly find first available port.
5294 * The port hash table (contained in the 'global' SCTP protocol storage
5295 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5296 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5297 * list (the list number is the port number hashed out, so as you
5298 * would expect from a hash function, all the ports in a given list have
5299 * such a number that hashes out to the same list number; you were
5300 * expecting that, right?); so each list has a set of ports, with a
5301 * link to the socket (struct sock) that uses it, the port number and
5302 * a fastreuse flag (FIXME: NPI ipg).
5304 static struct sctp_bind_bucket
*sctp_bucket_create(
5305 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
5307 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
5309 struct sctp_bind_hashbucket
*head
; /* hash list */
5310 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5311 struct hlist_node
*node
;
5312 unsigned short snum
;
5315 snum
= ntohs(addr
->v4
.sin_port
);
5317 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
5318 sctp_local_bh_disable();
5321 /* Search for an available port. */
5322 int low
, high
, remaining
, index
;
5325 inet_get_local_port_range(&low
, &high
);
5326 remaining
= (high
- low
) + 1;
5327 rover
= net_random() % remaining
+ low
;
5331 if ((rover
< low
) || (rover
> high
))
5333 index
= sctp_phashfn(rover
);
5334 head
= &sctp_port_hashtable
[index
];
5335 sctp_spin_lock(&head
->lock
);
5336 sctp_for_each_hentry(pp
, node
, &head
->chain
)
5337 if (pp
->port
== rover
)
5341 sctp_spin_unlock(&head
->lock
);
5342 } while (--remaining
> 0);
5344 /* Exhausted local port range during search? */
5349 /* OK, here is the one we will use. HEAD (the port
5350 * hash table list entry) is non-NULL and we hold it's
5355 /* We are given an specific port number; we verify
5356 * that it is not being used. If it is used, we will
5357 * exahust the search in the hash list corresponding
5358 * to the port number (snum) - we detect that with the
5359 * port iterator, pp being NULL.
5361 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
5362 sctp_spin_lock(&head
->lock
);
5363 sctp_for_each_hentry(pp
, node
, &head
->chain
) {
5364 if (pp
->port
== snum
)
5371 if (!hlist_empty(&pp
->owner
)) {
5372 /* We had a port hash table hit - there is an
5373 * available port (pp != NULL) and it is being
5374 * used by other socket (pp->owner not empty); that other
5375 * socket is going to be sk2.
5377 int reuse
= sk
->sk_reuse
;
5379 struct hlist_node
*node
;
5381 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5382 if (pp
->fastreuse
&& sk
->sk_reuse
&&
5383 sk
->sk_state
!= SCTP_SS_LISTENING
)
5386 /* Run through the list of sockets bound to the port
5387 * (pp->port) [via the pointers bind_next and
5388 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5389 * we get the endpoint they describe and run through
5390 * the endpoint's list of IP (v4 or v6) addresses,
5391 * comparing each of the addresses with the address of
5392 * the socket sk. If we find a match, then that means
5393 * that this port/socket (sk) combination are already
5396 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
5397 struct sctp_endpoint
*ep2
;
5398 ep2
= sctp_sk(sk2
)->ep
;
5400 if (reuse
&& sk2
->sk_reuse
&&
5401 sk2
->sk_state
!= SCTP_SS_LISTENING
)
5404 if (sctp_bind_addr_match(&ep2
->base
.bind_addr
, addr
,
5410 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5413 /* If there was a hash table miss, create a new port. */
5415 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
5418 /* In either case (hit or miss), make sure fastreuse is 1 only
5419 * if sk->sk_reuse is too (that is, if the caller requested
5420 * SO_REUSEADDR on this socket -sk-).
5422 if (hlist_empty(&pp
->owner
)) {
5423 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
5427 } else if (pp
->fastreuse
&&
5428 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
5431 /* We are set, so fill up all the data in the hash table
5432 * entry, tie the socket list information with the rest of the
5433 * sockets FIXME: Blurry, NPI (ipg).
5436 if (!sctp_sk(sk
)->bind_hash
) {
5437 inet_sk(sk
)->num
= snum
;
5438 sk_add_bind_node(sk
, &pp
->owner
);
5439 sctp_sk(sk
)->bind_hash
= pp
;
5444 sctp_spin_unlock(&head
->lock
);
5447 sctp_local_bh_enable();
5451 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5452 * port is requested.
5454 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
5457 union sctp_addr addr
;
5458 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5460 /* Set up a dummy address struct from the sk. */
5461 af
->from_sk(&addr
, sk
);
5462 addr
.v4
.sin_port
= htons(snum
);
5464 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5465 ret
= sctp_get_port_local(sk
, &addr
);
5467 return (ret
? 1 : 0);
5471 * 3.1.3 listen() - UDP Style Syntax
5473 * By default, new associations are not accepted for UDP style sockets.
5474 * An application uses listen() to mark a socket as being able to
5475 * accept new associations.
5477 SCTP_STATIC
int sctp_seqpacket_listen(struct sock
*sk
, int backlog
)
5479 struct sctp_sock
*sp
= sctp_sk(sk
);
5480 struct sctp_endpoint
*ep
= sp
->ep
;
5482 /* Only UDP style sockets that are not peeled off are allowed to
5485 if (!sctp_style(sk
, UDP
))
5488 /* If backlog is zero, disable listening. */
5490 if (sctp_sstate(sk
, CLOSED
))
5493 sctp_unhash_endpoint(ep
);
5494 sk
->sk_state
= SCTP_SS_CLOSED
;
5498 /* Return if we are already listening. */
5499 if (sctp_sstate(sk
, LISTENING
))
5503 * If a bind() or sctp_bindx() is not called prior to a listen()
5504 * call that allows new associations to be accepted, the system
5505 * picks an ephemeral port and will choose an address set equivalent
5506 * to binding with a wildcard address.
5508 * This is not currently spelled out in the SCTP sockets
5509 * extensions draft, but follows the practice as seen in TCP
5512 * Additionally, turn off fastreuse flag since we are not listening
5514 sk
->sk_state
= SCTP_SS_LISTENING
;
5515 if (!ep
->base
.bind_addr
.port
) {
5516 if (sctp_autobind(sk
))
5519 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5521 sctp_hash_endpoint(ep
);
5526 * 4.1.3 listen() - TCP Style Syntax
5528 * Applications uses listen() to ready the SCTP endpoint for accepting
5529 * inbound associations.
5531 SCTP_STATIC
int sctp_stream_listen(struct sock
*sk
, int backlog
)
5533 struct sctp_sock
*sp
= sctp_sk(sk
);
5534 struct sctp_endpoint
*ep
= sp
->ep
;
5536 /* If backlog is zero, disable listening. */
5538 if (sctp_sstate(sk
, CLOSED
))
5541 sctp_unhash_endpoint(ep
);
5542 sk
->sk_state
= SCTP_SS_CLOSED
;
5546 if (sctp_sstate(sk
, LISTENING
))
5550 * If a bind() or sctp_bindx() is not called prior to a listen()
5551 * call that allows new associations to be accepted, the system
5552 * picks an ephemeral port and will choose an address set equivalent
5553 * to binding with a wildcard address.
5555 * This is not currently spelled out in the SCTP sockets
5556 * extensions draft, but follows the practice as seen in TCP
5559 sk
->sk_state
= SCTP_SS_LISTENING
;
5560 if (!ep
->base
.bind_addr
.port
) {
5561 if (sctp_autobind(sk
))
5564 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5566 sk
->sk_max_ack_backlog
= backlog
;
5567 sctp_hash_endpoint(ep
);
5572 * Move a socket to LISTENING state.
5574 int sctp_inet_listen(struct socket
*sock
, int backlog
)
5576 struct sock
*sk
= sock
->sk
;
5577 struct crypto_hash
*tfm
= NULL
;
5580 if (unlikely(backlog
< 0))
5585 if (sock
->state
!= SS_UNCONNECTED
)
5588 /* Allocate HMAC for generating cookie. */
5589 if (sctp_hmac_alg
) {
5590 tfm
= crypto_alloc_hash(sctp_hmac_alg
, 0, CRYPTO_ALG_ASYNC
);
5592 if (net_ratelimit()) {
5594 "SCTP: failed to load transform for %s: %ld\n",
5595 sctp_hmac_alg
, PTR_ERR(tfm
));
5602 switch (sock
->type
) {
5603 case SOCK_SEQPACKET
:
5604 err
= sctp_seqpacket_listen(sk
, backlog
);
5607 err
= sctp_stream_listen(sk
, backlog
);
5616 /* Store away the transform reference. */
5617 sctp_sk(sk
)->hmac
= tfm
;
5619 sctp_release_sock(sk
);
5622 crypto_free_hash(tfm
);
5627 * This function is done by modeling the current datagram_poll() and the
5628 * tcp_poll(). Note that, based on these implementations, we don't
5629 * lock the socket in this function, even though it seems that,
5630 * ideally, locking or some other mechanisms can be used to ensure
5631 * the integrity of the counters (sndbuf and wmem_alloc) used
5632 * in this place. We assume that we don't need locks either until proven
5635 * Another thing to note is that we include the Async I/O support
5636 * here, again, by modeling the current TCP/UDP code. We don't have
5637 * a good way to test with it yet.
5639 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
5641 struct sock
*sk
= sock
->sk
;
5642 struct sctp_sock
*sp
= sctp_sk(sk
);
5645 poll_wait(file
, sk
->sk_sleep
, wait
);
5647 /* A TCP-style listening socket becomes readable when the accept queue
5650 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
5651 return (!list_empty(&sp
->ep
->asocs
)) ?
5652 (POLLIN
| POLLRDNORM
) : 0;
5656 /* Is there any exceptional events? */
5657 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
5659 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5661 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
5664 /* Is it readable? Reconsider this code with TCP-style support. */
5665 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
5666 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
5667 mask
|= POLLIN
| POLLRDNORM
;
5669 /* The association is either gone or not ready. */
5670 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
5673 /* Is it writable? */
5674 if (sctp_writeable(sk
)) {
5675 mask
|= POLLOUT
| POLLWRNORM
;
5677 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
5679 * Since the socket is not locked, the buffer
5680 * might be made available after the writeable check and
5681 * before the bit is set. This could cause a lost I/O
5682 * signal. tcp_poll() has a race breaker for this race
5683 * condition. Based on their implementation, we put
5684 * in the following code to cover it as well.
5686 if (sctp_writeable(sk
))
5687 mask
|= POLLOUT
| POLLWRNORM
;
5692 /********************************************************************
5693 * 2nd Level Abstractions
5694 ********************************************************************/
5696 static struct sctp_bind_bucket
*sctp_bucket_create(
5697 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
5699 struct sctp_bind_bucket
*pp
;
5701 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
5702 SCTP_DBG_OBJCNT_INC(bind_bucket
);
5706 INIT_HLIST_HEAD(&pp
->owner
);
5707 hlist_add_head(&pp
->node
, &head
->chain
);
5712 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5713 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
5715 if (pp
&& hlist_empty(&pp
->owner
)) {
5716 __hlist_del(&pp
->node
);
5717 kmem_cache_free(sctp_bucket_cachep
, pp
);
5718 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
5722 /* Release this socket's reference to a local port. */
5723 static inline void __sctp_put_port(struct sock
*sk
)
5725 struct sctp_bind_hashbucket
*head
=
5726 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->num
)];
5727 struct sctp_bind_bucket
*pp
;
5729 sctp_spin_lock(&head
->lock
);
5730 pp
= sctp_sk(sk
)->bind_hash
;
5731 __sk_del_bind_node(sk
);
5732 sctp_sk(sk
)->bind_hash
= NULL
;
5733 inet_sk(sk
)->num
= 0;
5734 sctp_bucket_destroy(pp
);
5735 sctp_spin_unlock(&head
->lock
);
5738 void sctp_put_port(struct sock
*sk
)
5740 sctp_local_bh_disable();
5741 __sctp_put_port(sk
);
5742 sctp_local_bh_enable();
5746 * The system picks an ephemeral port and choose an address set equivalent
5747 * to binding with a wildcard address.
5748 * One of those addresses will be the primary address for the association.
5749 * This automatically enables the multihoming capability of SCTP.
5751 static int sctp_autobind(struct sock
*sk
)
5753 union sctp_addr autoaddr
;
5757 /* Initialize a local sockaddr structure to INADDR_ANY. */
5758 af
= sctp_sk(sk
)->pf
->af
;
5760 port
= htons(inet_sk(sk
)->num
);
5761 af
->inaddr_any(&autoaddr
, port
);
5763 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5766 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5769 * 4.2 The cmsghdr Structure *
5771 * When ancillary data is sent or received, any number of ancillary data
5772 * objects can be specified by the msg_control and msg_controllen members of
5773 * the msghdr structure, because each object is preceded by
5774 * a cmsghdr structure defining the object's length (the cmsg_len member).
5775 * Historically Berkeley-derived implementations have passed only one object
5776 * at a time, but this API allows multiple objects to be
5777 * passed in a single call to sendmsg() or recvmsg(). The following example
5778 * shows two ancillary data objects in a control buffer.
5780 * |<--------------------------- msg_controllen -------------------------->|
5783 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5785 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5788 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5790 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5793 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5794 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5796 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5798 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5805 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
5806 sctp_cmsgs_t
*cmsgs
)
5808 struct cmsghdr
*cmsg
;
5810 for (cmsg
= CMSG_FIRSTHDR(msg
);
5812 cmsg
= CMSG_NXTHDR((struct msghdr
*)msg
, cmsg
)) {
5813 if (!CMSG_OK(msg
, cmsg
))
5816 /* Should we parse this header or ignore? */
5817 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
5820 /* Strictly check lengths following example in SCM code. */
5821 switch (cmsg
->cmsg_type
) {
5823 /* SCTP Socket API Extension
5824 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5826 * This cmsghdr structure provides information for
5827 * initializing new SCTP associations with sendmsg().
5828 * The SCTP_INITMSG socket option uses this same data
5829 * structure. This structure is not used for
5832 * cmsg_level cmsg_type cmsg_data[]
5833 * ------------ ------------ ----------------------
5834 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5836 if (cmsg
->cmsg_len
!=
5837 CMSG_LEN(sizeof(struct sctp_initmsg
)))
5839 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
5843 /* SCTP Socket API Extension
5844 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5846 * This cmsghdr structure specifies SCTP options for
5847 * sendmsg() and describes SCTP header information
5848 * about a received message through recvmsg().
5850 * cmsg_level cmsg_type cmsg_data[]
5851 * ------------ ------------ ----------------------
5852 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5854 if (cmsg
->cmsg_len
!=
5855 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
5859 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
5861 /* Minimally, validate the sinfo_flags. */
5862 if (cmsgs
->info
->sinfo_flags
&
5863 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
5864 SCTP_ABORT
| SCTP_EOF
))
5876 * Wait for a packet..
5877 * Note: This function is the same function as in core/datagram.c
5878 * with a few modifications to make lksctp work.
5880 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
5885 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5887 /* Socket errors? */
5888 error
= sock_error(sk
);
5892 if (!skb_queue_empty(&sk
->sk_receive_queue
))
5895 /* Socket shut down? */
5896 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5899 /* Sequenced packets can come disconnected. If so we report the
5904 /* Is there a good reason to think that we may receive some data? */
5905 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
5908 /* Handle signals. */
5909 if (signal_pending(current
))
5912 /* Let another process have a go. Since we are going to sleep
5913 * anyway. Note: This may cause odd behaviors if the message
5914 * does not fit in the user's buffer, but this seems to be the
5915 * only way to honor MSG_DONTWAIT realistically.
5917 sctp_release_sock(sk
);
5918 *timeo_p
= schedule_timeout(*timeo_p
);
5922 finish_wait(sk
->sk_sleep
, &wait
);
5926 error
= sock_intr_errno(*timeo_p
);
5929 finish_wait(sk
->sk_sleep
, &wait
);
5934 /* Receive a datagram.
5935 * Note: This is pretty much the same routine as in core/datagram.c
5936 * with a few changes to make lksctp work.
5938 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
5939 int noblock
, int *err
)
5942 struct sk_buff
*skb
;
5945 timeo
= sock_rcvtimeo(sk
, noblock
);
5947 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
5948 timeo
, MAX_SCHEDULE_TIMEOUT
);
5951 /* Again only user level code calls this function,
5952 * so nothing interrupt level
5953 * will suddenly eat the receive_queue.
5955 * Look at current nfs client by the way...
5956 * However, this function was corrent in any case. 8)
5958 if (flags
& MSG_PEEK
) {
5959 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
5960 skb
= skb_peek(&sk
->sk_receive_queue
);
5962 atomic_inc(&skb
->users
);
5963 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
5965 skb
= skb_dequeue(&sk
->sk_receive_queue
);
5971 /* Caller is allowed not to check sk->sk_err before calling. */
5972 error
= sock_error(sk
);
5976 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5979 /* User doesn't want to wait. */
5983 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
5992 /* If sndbuf has changed, wake up per association sndbuf waiters. */
5993 static void __sctp_write_space(struct sctp_association
*asoc
)
5995 struct sock
*sk
= asoc
->base
.sk
;
5996 struct socket
*sock
= sk
->sk_socket
;
5998 if ((sctp_wspace(asoc
) > 0) && sock
) {
5999 if (waitqueue_active(&asoc
->wait
))
6000 wake_up_interruptible(&asoc
->wait
);
6002 if (sctp_writeable(sk
)) {
6003 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
6004 wake_up_interruptible(sk
->sk_sleep
);
6006 /* Note that we try to include the Async I/O support
6007 * here by modeling from the current TCP/UDP code.
6008 * We have not tested with it yet.
6010 if (sock
->fasync_list
&&
6011 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
6012 sock_wake_async(sock
,
6013 SOCK_WAKE_SPACE
, POLL_OUT
);
6018 /* Do accounting for the sndbuf space.
6019 * Decrement the used sndbuf space of the corresponding association by the
6020 * data size which was just transmitted(freed).
6022 static void sctp_wfree(struct sk_buff
*skb
)
6024 struct sctp_association
*asoc
;
6025 struct sctp_chunk
*chunk
;
6028 /* Get the saved chunk pointer. */
6029 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
6032 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
6033 sizeof(struct sk_buff
) +
6034 sizeof(struct sctp_chunk
);
6036 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
6039 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6041 sk
->sk_wmem_queued
-= skb
->truesize
;
6042 sk_mem_uncharge(sk
, skb
->truesize
);
6045 __sctp_write_space(asoc
);
6047 sctp_association_put(asoc
);
6050 /* Do accounting for the receive space on the socket.
6051 * Accounting for the association is done in ulpevent.c
6052 * We set this as a destructor for the cloned data skbs so that
6053 * accounting is done at the correct time.
6055 void sctp_sock_rfree(struct sk_buff
*skb
)
6057 struct sock
*sk
= skb
->sk
;
6058 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
6060 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
6063 * Mimic the behavior of sock_rfree
6065 sk_mem_uncharge(sk
, event
->rmem_len
);
6069 /* Helper function to wait for space in the sndbuf. */
6070 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
6073 struct sock
*sk
= asoc
->base
.sk
;
6075 long current_timeo
= *timeo_p
;
6078 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6079 asoc
, (long)(*timeo_p
), msg_len
);
6081 /* Increment the association's refcnt. */
6082 sctp_association_hold(asoc
);
6084 /* Wait on the association specific sndbuf space. */
6086 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6087 TASK_INTERRUPTIBLE
);
6090 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6093 if (signal_pending(current
))
6094 goto do_interrupted
;
6095 if (msg_len
<= sctp_wspace(asoc
))
6098 /* Let another process have a go. Since we are going
6101 sctp_release_sock(sk
);
6102 current_timeo
= schedule_timeout(current_timeo
);
6103 BUG_ON(sk
!= asoc
->base
.sk
);
6106 *timeo_p
= current_timeo
;
6110 finish_wait(&asoc
->wait
, &wait
);
6112 /* Release the association's refcnt. */
6113 sctp_association_put(asoc
);
6122 err
= sock_intr_errno(*timeo_p
);
6130 /* If socket sndbuf has changed, wake up all per association waiters. */
6131 void sctp_write_space(struct sock
*sk
)
6133 struct sctp_association
*asoc
;
6134 struct list_head
*pos
;
6136 /* Wake up the tasks in each wait queue. */
6137 list_for_each(pos
, &((sctp_sk(sk
))->ep
->asocs
)) {
6138 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
6139 __sctp_write_space(asoc
);
6143 /* Is there any sndbuf space available on the socket?
6145 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6146 * associations on the same socket. For a UDP-style socket with
6147 * multiple associations, it is possible for it to be "unwriteable"
6148 * prematurely. I assume that this is acceptable because
6149 * a premature "unwriteable" is better than an accidental "writeable" which
6150 * would cause an unwanted block under certain circumstances. For the 1-1
6151 * UDP-style sockets or TCP-style sockets, this code should work.
6154 static int sctp_writeable(struct sock
*sk
)
6158 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
6164 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6165 * returns immediately with EINPROGRESS.
6167 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
6169 struct sock
*sk
= asoc
->base
.sk
;
6171 long current_timeo
= *timeo_p
;
6174 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __FUNCTION__
, asoc
,
6177 /* Increment the association's refcnt. */
6178 sctp_association_hold(asoc
);
6181 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6182 TASK_INTERRUPTIBLE
);
6185 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6187 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6190 if (signal_pending(current
))
6191 goto do_interrupted
;
6193 if (sctp_state(asoc
, ESTABLISHED
))
6196 /* Let another process have a go. Since we are going
6199 sctp_release_sock(sk
);
6200 current_timeo
= schedule_timeout(current_timeo
);
6203 *timeo_p
= current_timeo
;
6207 finish_wait(&asoc
->wait
, &wait
);
6209 /* Release the association's refcnt. */
6210 sctp_association_put(asoc
);
6215 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
6218 err
= -ECONNREFUSED
;
6222 err
= sock_intr_errno(*timeo_p
);
6230 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
6232 struct sctp_endpoint
*ep
;
6236 ep
= sctp_sk(sk
)->ep
;
6240 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
,
6241 TASK_INTERRUPTIBLE
);
6243 if (list_empty(&ep
->asocs
)) {
6244 sctp_release_sock(sk
);
6245 timeo
= schedule_timeout(timeo
);
6250 if (!sctp_sstate(sk
, LISTENING
))
6254 if (!list_empty(&ep
->asocs
))
6257 err
= sock_intr_errno(timeo
);
6258 if (signal_pending(current
))
6266 finish_wait(sk
->sk_sleep
, &wait
);
6271 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
6276 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
6277 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
6279 sctp_release_sock(sk
);
6280 timeout
= schedule_timeout(timeout
);
6282 } while (!signal_pending(current
) && timeout
);
6284 finish_wait(sk
->sk_sleep
, &wait
);
6287 static void sctp_sock_rfree_frag(struct sk_buff
*skb
)
6289 struct sk_buff
*frag
;
6294 /* Don't forget the fragments. */
6295 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
6296 sctp_sock_rfree_frag(frag
);
6299 sctp_sock_rfree(skb
);
6302 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
6304 struct sk_buff
*frag
;
6309 /* Don't forget the fragments. */
6310 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
6311 sctp_skb_set_owner_r_frag(frag
, sk
);
6314 sctp_skb_set_owner_r(skb
, sk
);
6317 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6318 * and its messages to the newsk.
6320 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
6321 struct sctp_association
*assoc
,
6322 sctp_socket_type_t type
)
6324 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
6325 struct sctp_sock
*newsp
= sctp_sk(newsk
);
6326 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
6327 struct sctp_endpoint
*newep
= newsp
->ep
;
6328 struct sk_buff
*skb
, *tmp
;
6329 struct sctp_ulpevent
*event
;
6330 struct sctp_bind_hashbucket
*head
;
6332 /* Migrate socket buffer sizes and all the socket level options to the
6335 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
6336 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
6337 /* Brute force copy old sctp opt. */
6338 inet_sk_copy_descendant(newsk
, oldsk
);
6340 /* Restore the ep value that was overwritten with the above structure
6346 /* Hook this new socket in to the bind_hash list. */
6347 head
= &sctp_port_hashtable
[sctp_phashfn(inet_sk(oldsk
)->num
)];
6348 sctp_local_bh_disable();
6349 sctp_spin_lock(&head
->lock
);
6350 pp
= sctp_sk(oldsk
)->bind_hash
;
6351 sk_add_bind_node(newsk
, &pp
->owner
);
6352 sctp_sk(newsk
)->bind_hash
= pp
;
6353 inet_sk(newsk
)->num
= inet_sk(oldsk
)->num
;
6354 sctp_spin_unlock(&head
->lock
);
6355 sctp_local_bh_enable();
6357 /* Copy the bind_addr list from the original endpoint to the new
6358 * endpoint so that we can handle restarts properly
6360 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
6361 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
6363 /* Move any messages in the old socket's receive queue that are for the
6364 * peeled off association to the new socket's receive queue.
6366 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
6367 event
= sctp_skb2event(skb
);
6368 if (event
->asoc
== assoc
) {
6369 sctp_sock_rfree_frag(skb
);
6370 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
6371 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
6372 sctp_skb_set_owner_r_frag(skb
, newsk
);
6376 /* Clean up any messages pending delivery due to partial
6377 * delivery. Three cases:
6378 * 1) No partial deliver; no work.
6379 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6380 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6382 skb_queue_head_init(&newsp
->pd_lobby
);
6383 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
6385 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
6386 struct sk_buff_head
*queue
;
6388 /* Decide which queue to move pd_lobby skbs to. */
6389 if (assoc
->ulpq
.pd_mode
) {
6390 queue
= &newsp
->pd_lobby
;
6392 queue
= &newsk
->sk_receive_queue
;
6394 /* Walk through the pd_lobby, looking for skbs that
6395 * need moved to the new socket.
6397 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6398 event
= sctp_skb2event(skb
);
6399 if (event
->asoc
== assoc
) {
6400 sctp_sock_rfree_frag(skb
);
6401 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6402 __skb_queue_tail(queue
, skb
);
6403 sctp_skb_set_owner_r_frag(skb
, newsk
);
6407 /* Clear up any skbs waiting for the partial
6408 * delivery to finish.
6410 if (assoc
->ulpq
.pd_mode
)
6411 sctp_clear_pd(oldsk
, NULL
);
6415 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
) {
6416 sctp_sock_rfree_frag(skb
);
6417 sctp_skb_set_owner_r_frag(skb
, newsk
);
6420 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
) {
6421 sctp_sock_rfree_frag(skb
);
6422 sctp_skb_set_owner_r_frag(skb
, newsk
);
6425 /* Set the type of socket to indicate that it is peeled off from the
6426 * original UDP-style socket or created with the accept() call on a
6427 * TCP-style socket..
6431 /* Mark the new socket "in-use" by the user so that any packets
6432 * that may arrive on the association after we've moved it are
6433 * queued to the backlog. This prevents a potential race between
6434 * backlog processing on the old socket and new-packet processing
6435 * on the new socket.
6437 * The caller has just allocated newsk so we can guarantee that other
6438 * paths won't try to lock it and then oldsk.
6440 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
6441 sctp_assoc_migrate(assoc
, newsk
);
6443 /* If the association on the newsk is already closed before accept()
6444 * is called, set RCV_SHUTDOWN flag.
6446 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
6447 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
6449 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
6450 sctp_release_sock(newsk
);
6454 DEFINE_PROTO_INUSE(sctp
)
6456 /* This proto struct describes the ULP interface for SCTP. */
6457 struct proto sctp_prot
= {
6459 .owner
= THIS_MODULE
,
6460 .close
= sctp_close
,
6461 .connect
= sctp_connect
,
6462 .disconnect
= sctp_disconnect
,
6463 .accept
= sctp_accept
,
6464 .ioctl
= sctp_ioctl
,
6465 .init
= sctp_init_sock
,
6466 .destroy
= sctp_destroy_sock
,
6467 .shutdown
= sctp_shutdown
,
6468 .setsockopt
= sctp_setsockopt
,
6469 .getsockopt
= sctp_getsockopt
,
6470 .sendmsg
= sctp_sendmsg
,
6471 .recvmsg
= sctp_recvmsg
,
6473 .backlog_rcv
= sctp_backlog_rcv
,
6475 .unhash
= sctp_unhash
,
6476 .get_port
= sctp_get_port
,
6477 .obj_size
= sizeof(struct sctp_sock
),
6478 .sysctl_mem
= sysctl_sctp_mem
,
6479 .sysctl_rmem
= sysctl_sctp_rmem
,
6480 .sysctl_wmem
= sysctl_sctp_wmem
,
6481 .memory_pressure
= &sctp_memory_pressure
,
6482 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6483 .memory_allocated
= &sctp_memory_allocated
,
6484 REF_PROTO_INUSE(sctp
)
6487 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6488 DEFINE_PROTO_INUSE(sctpv6
)
6490 struct proto sctpv6_prot
= {
6492 .owner
= THIS_MODULE
,
6493 .close
= sctp_close
,
6494 .connect
= sctp_connect
,
6495 .disconnect
= sctp_disconnect
,
6496 .accept
= sctp_accept
,
6497 .ioctl
= sctp_ioctl
,
6498 .init
= sctp_init_sock
,
6499 .destroy
= sctp_destroy_sock
,
6500 .shutdown
= sctp_shutdown
,
6501 .setsockopt
= sctp_setsockopt
,
6502 .getsockopt
= sctp_getsockopt
,
6503 .sendmsg
= sctp_sendmsg
,
6504 .recvmsg
= sctp_recvmsg
,
6506 .backlog_rcv
= sctp_backlog_rcv
,
6508 .unhash
= sctp_unhash
,
6509 .get_port
= sctp_get_port
,
6510 .obj_size
= sizeof(struct sctp6_sock
),
6511 .sysctl_mem
= sysctl_sctp_mem
,
6512 .sysctl_rmem
= sysctl_sctp_rmem
,
6513 .sysctl_wmem
= sysctl_sctp_wmem
,
6514 .memory_pressure
= &sctp_memory_pressure
,
6515 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6516 .memory_allocated
= &sctp_memory_allocated
,
6517 REF_PROTO_INUSE(sctpv6
)
6519 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */