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(struct sock
*sk
)
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 /* V4 mapped address are really of AF_INET family */
312 if (addr
->sa
.sa_family
== AF_INET6
&&
313 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
)) {
314 if (!opt
->pf
->af_supported(AF_INET
, opt
))
317 /* Does this PF support this AF? */
318 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
322 /* If we get this far, af is valid. */
323 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
325 if (len
< af
->sockaddr_len
)
331 /* Bind a local address either to an endpoint or to an association. */
332 SCTP_STATIC
int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
334 struct sctp_sock
*sp
= sctp_sk(sk
);
335 struct sctp_endpoint
*ep
= sp
->ep
;
336 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
341 /* Common sockaddr verification. */
342 af
= sctp_sockaddr_af(sp
, addr
, len
);
344 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
349 snum
= ntohs(addr
->v4
.sin_port
);
351 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
352 ", port: %d, new port: %d, len: %d)\n",
358 /* PF specific bind() address verification. */
359 if (!sp
->pf
->bind_verify(sp
, addr
))
360 return -EADDRNOTAVAIL
;
362 /* We must either be unbound, or bind to the same port.
363 * It's OK to allow 0 ports if we are already bound.
364 * We'll just inhert an already bound port in this case
369 else if (snum
!= bp
->port
) {
370 SCTP_DEBUG_PRINTK("sctp_do_bind:"
371 " New port %d does not match existing port "
372 "%d.\n", snum
, bp
->port
);
377 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
380 /* See if the address matches any of the addresses we may have
381 * already bound before checking against other endpoints.
383 if (sctp_bind_addr_match(bp
, addr
, sp
))
386 /* Make sure we are allowed to bind here.
387 * The function sctp_get_port_local() does duplicate address
390 addr
->v4
.sin_port
= htons(snum
);
391 if ((ret
= sctp_get_port_local(sk
, addr
))) {
395 /* Refresh ephemeral port. */
397 bp
->port
= inet_sk(sk
)->num
;
399 /* Add the address to the bind address list.
400 * Use GFP_ATOMIC since BHs will be disabled.
402 ret
= sctp_add_bind_addr(bp
, addr
, SCTP_ADDR_SRC
, GFP_ATOMIC
);
404 /* Copy back into socket for getsockname() use. */
406 inet_sk(sk
)->sport
= htons(inet_sk(sk
)->num
);
407 af
->to_sk_saddr(addr
, sk
);
413 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
415 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
416 * at any one time. If a sender, after sending an ASCONF chunk, decides
417 * it needs to transfer another ASCONF Chunk, it MUST wait until the
418 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
419 * subsequent ASCONF. Note this restriction binds each side, so at any
420 * time two ASCONF may be in-transit on any given association (one sent
421 * from each endpoint).
423 static int sctp_send_asconf(struct sctp_association
*asoc
,
424 struct sctp_chunk
*chunk
)
428 /* If there is an outstanding ASCONF chunk, queue it for later
431 if (asoc
->addip_last_asconf
) {
432 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
436 /* Hold the chunk until an ASCONF_ACK is received. */
437 sctp_chunk_hold(chunk
);
438 retval
= sctp_primitive_ASCONF(asoc
, chunk
);
440 sctp_chunk_free(chunk
);
442 asoc
->addip_last_asconf
= chunk
;
448 /* Add a list of addresses as bind addresses to local endpoint or
451 * Basically run through each address specified in the addrs/addrcnt
452 * array/length pair, determine if it is IPv6 or IPv4 and call
453 * sctp_do_bind() on it.
455 * If any of them fails, then the operation will be reversed and the
456 * ones that were added will be removed.
458 * Only sctp_setsockopt_bindx() is supposed to call this function.
460 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
465 struct sockaddr
*sa_addr
;
468 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
472 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
473 /* The list may contain either IPv4 or IPv6 address;
474 * determine the address length for walking thru the list.
476 sa_addr
= (struct sockaddr
*)addr_buf
;
477 af
= sctp_get_af_specific(sa_addr
->sa_family
);
483 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
486 addr_buf
+= af
->sockaddr_len
;
490 /* Failed. Cleanup the ones that have been added */
492 sctp_bindx_rem(sk
, addrs
, cnt
);
500 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
501 * associations that are part of the endpoint indicating that a list of local
502 * addresses are added to the endpoint.
504 * If any of the addresses is already in the bind address list of the
505 * association, we do not send the chunk for that association. But it will not
506 * affect other associations.
508 * Only sctp_setsockopt_bindx() is supposed to call this function.
510 static int sctp_send_asconf_add_ip(struct sock
*sk
,
511 struct sockaddr
*addrs
,
514 struct sctp_sock
*sp
;
515 struct sctp_endpoint
*ep
;
516 struct sctp_association
*asoc
;
517 struct sctp_bind_addr
*bp
;
518 struct sctp_chunk
*chunk
;
519 struct sctp_sockaddr_entry
*laddr
;
520 union sctp_addr
*addr
;
521 union sctp_addr saveaddr
;
528 if (!sctp_addip_enable
)
534 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
535 __func__
, sk
, addrs
, addrcnt
);
537 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
539 if (!asoc
->peer
.asconf_capable
)
542 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
545 if (!sctp_state(asoc
, ESTABLISHED
))
548 /* Check if any address in the packed array of addresses is
549 * in the bind address list of the association. If so,
550 * do not send the asconf chunk to its peer, but continue with
551 * other associations.
554 for (i
= 0; i
< addrcnt
; i
++) {
555 addr
= (union sctp_addr
*)addr_buf
;
556 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
562 if (sctp_assoc_lookup_laddr(asoc
, addr
))
565 addr_buf
+= af
->sockaddr_len
;
570 /* Use the first valid address in bind addr list of
571 * association as Address Parameter of ASCONF CHUNK.
573 bp
= &asoc
->base
.bind_addr
;
574 p
= bp
->address_list
.next
;
575 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
576 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
577 addrcnt
, SCTP_PARAM_ADD_IP
);
583 retval
= sctp_send_asconf(asoc
, chunk
);
587 /* Add the new addresses to the bind address list with
588 * use_as_src set to 0.
591 for (i
= 0; i
< addrcnt
; i
++) {
592 addr
= (union sctp_addr
*)addr_buf
;
593 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
594 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
595 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
596 SCTP_ADDR_NEW
, GFP_ATOMIC
);
597 addr_buf
+= af
->sockaddr_len
;
605 /* Remove a list of addresses from bind addresses list. Do not remove the
608 * Basically run through each address specified in the addrs/addrcnt
609 * array/length pair, determine if it is IPv6 or IPv4 and call
610 * sctp_del_bind() on it.
612 * If any of them fails, then the operation will be reversed and the
613 * ones that were removed will be added back.
615 * At least one address has to be left; if only one address is
616 * available, the operation will return -EBUSY.
618 * Only sctp_setsockopt_bindx() is supposed to call this function.
620 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
622 struct sctp_sock
*sp
= sctp_sk(sk
);
623 struct sctp_endpoint
*ep
= sp
->ep
;
625 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
628 union sctp_addr
*sa_addr
;
631 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
635 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
636 /* If the bind address list is empty or if there is only one
637 * bind address, there is nothing more to be removed (we need
638 * at least one address here).
640 if (list_empty(&bp
->address_list
) ||
641 (sctp_list_single_entry(&bp
->address_list
))) {
646 sa_addr
= (union sctp_addr
*)addr_buf
;
647 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
653 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
654 retval
= -EADDRNOTAVAIL
;
658 if (sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
663 /* FIXME - There is probably a need to check if sk->sk_saddr and
664 * sk->sk_rcv_addr are currently set to one of the addresses to
665 * be removed. This is something which needs to be looked into
666 * when we are fixing the outstanding issues with multi-homing
667 * socket routing and failover schemes. Refer to comments in
668 * sctp_do_bind(). -daisy
670 retval
= sctp_del_bind_addr(bp
, sa_addr
);
672 addr_buf
+= af
->sockaddr_len
;
675 /* Failed. Add the ones that has been removed back */
677 sctp_bindx_add(sk
, addrs
, cnt
);
685 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
686 * the associations that are part of the endpoint indicating that a list of
687 * local addresses are removed from the endpoint.
689 * If any of the addresses is already in the bind address list of the
690 * association, we do not send the chunk for that association. But it will not
691 * affect other associations.
693 * Only sctp_setsockopt_bindx() is supposed to call this function.
695 static int sctp_send_asconf_del_ip(struct sock
*sk
,
696 struct sockaddr
*addrs
,
699 struct sctp_sock
*sp
;
700 struct sctp_endpoint
*ep
;
701 struct sctp_association
*asoc
;
702 struct sctp_transport
*transport
;
703 struct sctp_bind_addr
*bp
;
704 struct sctp_chunk
*chunk
;
705 union sctp_addr
*laddr
;
708 struct sctp_sockaddr_entry
*saddr
;
712 if (!sctp_addip_enable
)
718 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
719 __func__
, sk
, addrs
, addrcnt
);
721 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
723 if (!asoc
->peer
.asconf_capable
)
726 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
729 if (!sctp_state(asoc
, ESTABLISHED
))
732 /* Check if any address in the packed array of addresses is
733 * not present in the bind address list of the association.
734 * If so, do not send the asconf chunk to its peer, but
735 * continue with other associations.
738 for (i
= 0; i
< addrcnt
; i
++) {
739 laddr
= (union sctp_addr
*)addr_buf
;
740 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
746 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
749 addr_buf
+= af
->sockaddr_len
;
754 /* Find one address in the association's bind address list
755 * that is not in the packed array of addresses. This is to
756 * make sure that we do not delete all the addresses in the
759 bp
= &asoc
->base
.bind_addr
;
760 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
765 /* We do not need RCU protection throughout this loop
766 * because this is done under a socket lock from the
769 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
776 /* Reset use_as_src flag for the addresses in the bind address
777 * list that are to be deleted.
780 for (i
= 0; i
< addrcnt
; i
++) {
781 laddr
= (union sctp_addr
*)addr_buf
;
782 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
783 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
784 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
785 saddr
->state
= SCTP_ADDR_DEL
;
787 addr_buf
+= af
->sockaddr_len
;
790 /* Update the route and saddr entries for all the transports
791 * as some of the addresses in the bind address list are
792 * about to be deleted and cannot be used as source addresses.
794 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
796 dst_release(transport
->dst
);
797 sctp_transport_route(transport
, NULL
,
798 sctp_sk(asoc
->base
.sk
));
801 retval
= sctp_send_asconf(asoc
, chunk
);
807 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
810 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
813 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
814 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
817 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
818 * Section 3.1.2 for this usage.
820 * addrs is a pointer to an array of one or more socket addresses. Each
821 * address is contained in its appropriate structure (i.e. struct
822 * sockaddr_in or struct sockaddr_in6) the family of the address type
823 * must be used to distinguish the address length (note that this
824 * representation is termed a "packed array" of addresses). The caller
825 * specifies the number of addresses in the array with addrcnt.
827 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
828 * -1, and sets errno to the appropriate error code.
830 * For SCTP, the port given in each socket address must be the same, or
831 * sctp_bindx() will fail, setting errno to EINVAL.
833 * The flags parameter is formed from the bitwise OR of zero or more of
834 * the following currently defined flags:
836 * SCTP_BINDX_ADD_ADDR
838 * SCTP_BINDX_REM_ADDR
840 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
841 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
842 * addresses from the association. The two flags are mutually exclusive;
843 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
844 * not remove all addresses from an association; sctp_bindx() will
845 * reject such an attempt with EINVAL.
847 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
848 * additional addresses with an endpoint after calling bind(). Or use
849 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
850 * socket is associated with so that no new association accepted will be
851 * associated with those addresses. If the endpoint supports dynamic
852 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
853 * endpoint to send the appropriate message to the peer to change the
854 * peers address lists.
856 * Adding and removing addresses from a connected association is
857 * optional functionality. Implementations that do not support this
858 * functionality should return EOPNOTSUPP.
860 * Basically do nothing but copying the addresses from user to kernel
861 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
862 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
865 * We don't use copy_from_user() for optimization: we first do the
866 * sanity checks (buffer size -fast- and access check-healthy
867 * pointer); if all of those succeed, then we can alloc the memory
868 * (expensive operation) needed to copy the data to kernel. Then we do
869 * the copying without checking the user space area
870 * (__copy_from_user()).
872 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
875 * sk The sk of the socket
876 * addrs The pointer to the addresses in user land
877 * addrssize Size of the addrs buffer
878 * op Operation to perform (add or remove, see the flags of
881 * Returns 0 if ok, <0 errno code on error.
883 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
884 struct sockaddr __user
*addrs
,
885 int addrs_size
, int op
)
887 struct sockaddr
*kaddrs
;
891 struct sockaddr
*sa_addr
;
895 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
896 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
898 if (unlikely(addrs_size
<= 0))
901 /* Check the user passed a healthy pointer. */
902 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
905 /* Alloc space for the address array in kernel memory. */
906 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
907 if (unlikely(!kaddrs
))
910 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
915 /* Walk through the addrs buffer and count the number of addresses. */
917 while (walk_size
< addrs_size
) {
918 sa_addr
= (struct sockaddr
*)addr_buf
;
919 af
= sctp_get_af_specific(sa_addr
->sa_family
);
921 /* If the address family is not supported or if this address
922 * causes the address buffer to overflow return EINVAL.
924 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
929 addr_buf
+= af
->sockaddr_len
;
930 walk_size
+= af
->sockaddr_len
;
935 case SCTP_BINDX_ADD_ADDR
:
936 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
939 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
942 case SCTP_BINDX_REM_ADDR
:
943 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
946 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
960 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
962 * Common routine for handling connect() and sctp_connectx().
963 * Connect will come in with just a single address.
965 static int __sctp_connect(struct sock
* sk
,
966 struct sockaddr
*kaddrs
,
968 sctp_assoc_t
*assoc_id
)
970 struct sctp_sock
*sp
;
971 struct sctp_endpoint
*ep
;
972 struct sctp_association
*asoc
= NULL
;
973 struct sctp_association
*asoc2
;
974 struct sctp_transport
*transport
;
982 union sctp_addr
*sa_addr
= NULL
;
985 unsigned int f_flags
= 0;
990 /* connect() cannot be done on a socket that is already in ESTABLISHED
991 * state - UDP-style peeled off socket or a TCP-style socket that
992 * is already connected.
993 * It cannot be done even on a TCP-style listening socket.
995 if (sctp_sstate(sk
, ESTABLISHED
) ||
996 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
1001 /* Walk through the addrs buffer and count the number of addresses. */
1003 while (walk_size
< addrs_size
) {
1004 sa_addr
= (union sctp_addr
*)addr_buf
;
1005 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1006 port
= ntohs(sa_addr
->v4
.sin_port
);
1008 /* If the address family is not supported or if this address
1009 * causes the address buffer to overflow return EINVAL.
1011 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1016 /* Save current address so we can work with it */
1017 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1019 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1023 /* Make sure the destination port is correctly set
1026 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
)
1030 /* Check if there already is a matching association on the
1031 * endpoint (other than the one created here).
1033 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1034 if (asoc2
&& asoc2
!= asoc
) {
1035 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1042 /* If we could not find a matching association on the endpoint,
1043 * make sure that there is no peeled-off association matching
1044 * the peer address even on another socket.
1046 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1047 err
= -EADDRNOTAVAIL
;
1052 /* If a bind() or sctp_bindx() is not called prior to
1053 * an sctp_connectx() call, the system picks an
1054 * ephemeral port and will choose an address set
1055 * equivalent to binding with a wildcard address.
1057 if (!ep
->base
.bind_addr
.port
) {
1058 if (sctp_autobind(sk
)) {
1064 * If an unprivileged user inherits a 1-many
1065 * style socket with open associations on a
1066 * privileged port, it MAY be permitted to
1067 * accept new associations, but it SHOULD NOT
1068 * be permitted to open new associations.
1070 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1071 !capable(CAP_NET_BIND_SERVICE
)) {
1077 scope
= sctp_scope(&to
);
1078 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1085 /* Prime the peer's transport structures. */
1086 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1094 addr_buf
+= af
->sockaddr_len
;
1095 walk_size
+= af
->sockaddr_len
;
1098 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1103 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1108 /* Initialize sk's dport and daddr for getpeername() */
1109 inet_sk(sk
)->dport
= htons(asoc
->peer
.port
);
1110 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1111 af
->to_sk_daddr(sa_addr
, sk
);
1114 /* in-kernel sockets don't generally have a file allocated to them
1115 * if all they do is call sock_create_kern().
1117 if (sk
->sk_socket
->file
)
1118 f_flags
= sk
->sk_socket
->file
->f_flags
;
1120 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1122 err
= sctp_wait_for_connect(asoc
, &timeo
);
1123 if (!err
&& assoc_id
)
1124 *assoc_id
= asoc
->assoc_id
;
1126 /* Don't free association on exit. */
1131 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1132 " kaddrs: %p err: %d\n",
1135 sctp_association_free(asoc
);
1139 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1142 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1143 * sctp_assoc_t *asoc);
1145 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1146 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1147 * or IPv6 addresses.
1149 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1150 * Section 3.1.2 for this usage.
1152 * addrs is a pointer to an array of one or more socket addresses. Each
1153 * address is contained in its appropriate structure (i.e. struct
1154 * sockaddr_in or struct sockaddr_in6) the family of the address type
1155 * must be used to distengish the address length (note that this
1156 * representation is termed a "packed array" of addresses). The caller
1157 * specifies the number of addresses in the array with addrcnt.
1159 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1160 * the association id of the new association. On failure, sctp_connectx()
1161 * returns -1, and sets errno to the appropriate error code. The assoc_id
1162 * is not touched by the kernel.
1164 * For SCTP, the port given in each socket address must be the same, or
1165 * sctp_connectx() will fail, setting errno to EINVAL.
1167 * An application can use sctp_connectx to initiate an association with
1168 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1169 * allows a caller to specify multiple addresses at which a peer can be
1170 * reached. The way the SCTP stack uses the list of addresses to set up
1171 * the association is implementation dependant. This function only
1172 * specifies that the stack will try to make use of all the addresses in
1173 * the list when needed.
1175 * Note that the list of addresses passed in is only used for setting up
1176 * the association. It does not necessarily equal the set of addresses
1177 * the peer uses for the resulting association. If the caller wants to
1178 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1179 * retrieve them after the association has been set up.
1181 * Basically do nothing but copying the addresses from user to kernel
1182 * land and invoking either sctp_connectx(). This is used for tunneling
1183 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1185 * We don't use copy_from_user() for optimization: we first do the
1186 * sanity checks (buffer size -fast- and access check-healthy
1187 * pointer); if all of those succeed, then we can alloc the memory
1188 * (expensive operation) needed to copy the data to kernel. Then we do
1189 * the copying without checking the user space area
1190 * (__copy_from_user()).
1192 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1195 * sk The sk of the socket
1196 * addrs The pointer to the addresses in user land
1197 * addrssize Size of the addrs buffer
1199 * Returns >=0 if ok, <0 errno code on error.
1201 SCTP_STATIC
int __sctp_setsockopt_connectx(struct sock
* sk
,
1202 struct sockaddr __user
*addrs
,
1204 sctp_assoc_t
*assoc_id
)
1207 struct sockaddr
*kaddrs
;
1209 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1210 __func__
, sk
, addrs
, addrs_size
);
1212 if (unlikely(addrs_size
<= 0))
1215 /* Check the user passed a healthy pointer. */
1216 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1219 /* Alloc space for the address array in kernel memory. */
1220 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1221 if (unlikely(!kaddrs
))
1224 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1227 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, assoc_id
);
1236 * This is an older interface. It's kept for backward compatibility
1237 * to the option that doesn't provide association id.
1239 SCTP_STATIC
int sctp_setsockopt_connectx_old(struct sock
* sk
,
1240 struct sockaddr __user
*addrs
,
1243 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1247 * New interface for the API. The since the API is done with a socket
1248 * option, to make it simple we feed back the association id is as a return
1249 * indication to the call. Error is always negative and association id is
1252 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1253 struct sockaddr __user
*addrs
,
1256 sctp_assoc_t assoc_id
= 0;
1259 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1267 /* API 3.1.4 close() - UDP Style Syntax
1268 * Applications use close() to perform graceful shutdown (as described in
1269 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1270 * by a UDP-style socket.
1274 * ret = close(int sd);
1276 * sd - the socket descriptor of the associations to be closed.
1278 * To gracefully shutdown a specific association represented by the
1279 * UDP-style socket, an application should use the sendmsg() call,
1280 * passing no user data, but including the appropriate flag in the
1281 * ancillary data (see Section xxxx).
1283 * If sd in the close() call is a branched-off socket representing only
1284 * one association, the shutdown is performed on that association only.
1286 * 4.1.6 close() - TCP Style Syntax
1288 * Applications use close() to gracefully close down an association.
1292 * int close(int sd);
1294 * sd - the socket descriptor of the association to be closed.
1296 * After an application calls close() on a socket descriptor, no further
1297 * socket operations will succeed on that descriptor.
1299 * API 7.1.4 SO_LINGER
1301 * An application using the TCP-style socket can use this option to
1302 * perform the SCTP ABORT primitive. The linger option structure is:
1305 * int l_onoff; // option on/off
1306 * int l_linger; // linger time
1309 * To enable the option, set l_onoff to 1. If the l_linger value is set
1310 * to 0, calling close() is the same as the ABORT primitive. If the
1311 * value is set to a negative value, the setsockopt() call will return
1312 * an error. If the value is set to a positive value linger_time, the
1313 * close() can be blocked for at most linger_time ms. If the graceful
1314 * shutdown phase does not finish during this period, close() will
1315 * return but the graceful shutdown phase continues in the system.
1317 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1319 struct sctp_endpoint
*ep
;
1320 struct sctp_association
*asoc
;
1321 struct list_head
*pos
, *temp
;
1323 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1326 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1328 ep
= sctp_sk(sk
)->ep
;
1330 /* Walk all associations on an endpoint. */
1331 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1332 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1334 if (sctp_style(sk
, TCP
)) {
1335 /* A closed association can still be in the list if
1336 * it belongs to a TCP-style listening socket that is
1337 * not yet accepted. If so, free it. If not, send an
1338 * ABORT or SHUTDOWN based on the linger options.
1340 if (sctp_state(asoc
, CLOSED
)) {
1341 sctp_unhash_established(asoc
);
1342 sctp_association_free(asoc
);
1347 if (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
) {
1348 struct sctp_chunk
*chunk
;
1350 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1352 sctp_primitive_ABORT(asoc
, chunk
);
1354 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1357 /* Clean up any skbs sitting on the receive queue. */
1358 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1359 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1361 /* On a TCP-style socket, block for at most linger_time if set. */
1362 if (sctp_style(sk
, TCP
) && timeout
)
1363 sctp_wait_for_close(sk
, timeout
);
1365 /* This will run the backlog queue. */
1366 sctp_release_sock(sk
);
1368 /* Supposedly, no process has access to the socket, but
1369 * the net layers still may.
1371 sctp_local_bh_disable();
1372 sctp_bh_lock_sock(sk
);
1374 /* Hold the sock, since sk_common_release() will put sock_put()
1375 * and we have just a little more cleanup.
1378 sk_common_release(sk
);
1380 sctp_bh_unlock_sock(sk
);
1381 sctp_local_bh_enable();
1385 SCTP_DBG_OBJCNT_DEC(sock
);
1388 /* Handle EPIPE error. */
1389 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1392 err
= sock_error(sk
) ? : -EPIPE
;
1393 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1394 send_sig(SIGPIPE
, current
, 0);
1398 /* API 3.1.3 sendmsg() - UDP Style Syntax
1400 * An application uses sendmsg() and recvmsg() calls to transmit data to
1401 * and receive data from its peer.
1403 * ssize_t sendmsg(int socket, const struct msghdr *message,
1406 * socket - the socket descriptor of the endpoint.
1407 * message - pointer to the msghdr structure which contains a single
1408 * user message and possibly some ancillary data.
1410 * See Section 5 for complete description of the data
1413 * flags - flags sent or received with the user message, see Section
1414 * 5 for complete description of the flags.
1416 * Note: This function could use a rewrite especially when explicit
1417 * connect support comes in.
1419 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1421 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1423 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1424 struct msghdr
*msg
, size_t msg_len
)
1426 struct sctp_sock
*sp
;
1427 struct sctp_endpoint
*ep
;
1428 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1429 struct sctp_transport
*transport
, *chunk_tp
;
1430 struct sctp_chunk
*chunk
;
1432 struct sockaddr
*msg_name
= NULL
;
1433 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1434 struct sctp_sndrcvinfo
*sinfo
;
1435 struct sctp_initmsg
*sinit
;
1436 sctp_assoc_t associd
= 0;
1437 sctp_cmsgs_t cmsgs
= { NULL
};
1441 __u16 sinfo_flags
= 0;
1442 struct sctp_datamsg
*datamsg
;
1443 int msg_flags
= msg
->msg_flags
;
1445 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1452 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1454 /* We cannot send a message over a TCP-style listening socket. */
1455 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1460 /* Parse out the SCTP CMSGs. */
1461 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1464 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1468 /* Fetch the destination address for this packet. This
1469 * address only selects the association--it is not necessarily
1470 * the address we will send to.
1471 * For a peeled-off socket, msg_name is ignored.
1473 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1474 int msg_namelen
= msg
->msg_namelen
;
1476 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1481 if (msg_namelen
> sizeof(to
))
1482 msg_namelen
= sizeof(to
);
1483 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1484 msg_name
= msg
->msg_name
;
1490 /* Did the user specify SNDRCVINFO? */
1492 sinfo_flags
= sinfo
->sinfo_flags
;
1493 associd
= sinfo
->sinfo_assoc_id
;
1496 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1497 msg_len
, sinfo_flags
);
1499 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1500 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1505 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1506 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1507 * If SCTP_ABORT is set, the message length could be non zero with
1508 * the msg_iov set to the user abort reason.
1510 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1511 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1516 /* If SCTP_ADDR_OVER is set, there must be an address
1517 * specified in msg_name.
1519 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1526 SCTP_DEBUG_PRINTK("About to look up association.\n");
1530 /* If a msg_name has been specified, assume this is to be used. */
1532 /* Look for a matching association on the endpoint. */
1533 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1535 /* If we could not find a matching association on the
1536 * endpoint, make sure that it is not a TCP-style
1537 * socket that already has an association or there is
1538 * no peeled-off association on another socket.
1540 if ((sctp_style(sk
, TCP
) &&
1541 sctp_sstate(sk
, ESTABLISHED
)) ||
1542 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1543 err
= -EADDRNOTAVAIL
;
1548 asoc
= sctp_id2assoc(sk
, associd
);
1556 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1558 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1559 * socket that has an association in CLOSED state. This can
1560 * happen when an accepted socket has an association that is
1563 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1568 if (sinfo_flags
& SCTP_EOF
) {
1569 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1571 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1575 if (sinfo_flags
& SCTP_ABORT
) {
1577 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1583 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1584 sctp_primitive_ABORT(asoc
, chunk
);
1590 /* Do we need to create the association? */
1592 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1594 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1599 /* Check for invalid stream against the stream counts,
1600 * either the default or the user specified stream counts.
1603 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1604 /* Check against the defaults. */
1605 if (sinfo
->sinfo_stream
>=
1606 sp
->initmsg
.sinit_num_ostreams
) {
1611 /* Check against the requested. */
1612 if (sinfo
->sinfo_stream
>=
1613 sinit
->sinit_num_ostreams
) {
1621 * API 3.1.2 bind() - UDP Style Syntax
1622 * If a bind() or sctp_bindx() is not called prior to a
1623 * sendmsg() call that initiates a new association, the
1624 * system picks an ephemeral port and will choose an address
1625 * set equivalent to binding with a wildcard address.
1627 if (!ep
->base
.bind_addr
.port
) {
1628 if (sctp_autobind(sk
)) {
1634 * If an unprivileged user inherits a one-to-many
1635 * style socket with open associations on a privileged
1636 * port, it MAY be permitted to accept new associations,
1637 * but it SHOULD NOT be permitted to open new
1640 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1641 !capable(CAP_NET_BIND_SERVICE
)) {
1647 scope
= sctp_scope(&to
);
1648 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1655 /* If the SCTP_INIT ancillary data is specified, set all
1656 * the association init values accordingly.
1659 if (sinit
->sinit_num_ostreams
) {
1660 asoc
->c
.sinit_num_ostreams
=
1661 sinit
->sinit_num_ostreams
;
1663 if (sinit
->sinit_max_instreams
) {
1664 asoc
->c
.sinit_max_instreams
=
1665 sinit
->sinit_max_instreams
;
1667 if (sinit
->sinit_max_attempts
) {
1668 asoc
->max_init_attempts
1669 = sinit
->sinit_max_attempts
;
1671 if (sinit
->sinit_max_init_timeo
) {
1672 asoc
->max_init_timeo
=
1673 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1677 /* Prime the peer's transport structures. */
1678 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1683 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1690 /* ASSERT: we have a valid association at this point. */
1691 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1694 /* If the user didn't specify SNDRCVINFO, make up one with
1697 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1698 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1699 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1700 default_sinfo
.sinfo_context
= asoc
->default_context
;
1701 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1702 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1703 sinfo
= &default_sinfo
;
1706 /* API 7.1.7, the sndbuf size per association bounds the
1707 * maximum size of data that can be sent in a single send call.
1709 if (msg_len
> sk
->sk_sndbuf
) {
1714 if (asoc
->pmtu_pending
)
1715 sctp_assoc_pending_pmtu(asoc
);
1717 /* If fragmentation is disabled and the message length exceeds the
1718 * association fragmentation point, return EMSGSIZE. The I-D
1719 * does not specify what this error is, but this looks like
1722 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1728 /* Check for invalid stream. */
1729 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1735 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1736 if (!sctp_wspace(asoc
)) {
1737 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1742 /* If an address is passed with the sendto/sendmsg call, it is used
1743 * to override the primary destination address in the TCP model, or
1744 * when SCTP_ADDR_OVER flag is set in the UDP model.
1746 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1747 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1748 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1756 /* Auto-connect, if we aren't connected already. */
1757 if (sctp_state(asoc
, CLOSED
)) {
1758 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1761 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1764 /* Break the message into multiple chunks of maximum size. */
1765 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1771 /* Now send the (possibly) fragmented message. */
1772 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1773 sctp_chunk_hold(chunk
);
1775 /* Do accounting for the write space. */
1776 sctp_set_owner_w(chunk
);
1778 chunk
->transport
= chunk_tp
;
1780 /* Send it to the lower layers. Note: all chunks
1781 * must either fail or succeed. The lower layer
1782 * works that way today. Keep it that way or this
1785 err
= sctp_primitive_SEND(asoc
, chunk
);
1786 /* Did the lower layer accept the chunk? */
1788 sctp_chunk_free(chunk
);
1789 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1792 sctp_datamsg_put(datamsg
);
1798 /* If we are already past ASSOCIATE, the lower
1799 * layers are responsible for association cleanup.
1805 sctp_association_free(asoc
);
1807 sctp_release_sock(sk
);
1810 return sctp_error(sk
, msg_flags
, err
);
1817 err
= sock_error(sk
);
1827 /* This is an extended version of skb_pull() that removes the data from the
1828 * start of a skb even when data is spread across the list of skb's in the
1829 * frag_list. len specifies the total amount of data that needs to be removed.
1830 * when 'len' bytes could be removed from the skb, it returns 0.
1831 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1832 * could not be removed.
1834 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1836 struct sk_buff
*list
;
1837 int skb_len
= skb_headlen(skb
);
1840 if (len
<= skb_len
) {
1841 __skb_pull(skb
, len
);
1845 __skb_pull(skb
, skb_len
);
1847 for (list
= skb_shinfo(skb
)->frag_list
; list
; list
= list
->next
) {
1848 rlen
= sctp_skb_pull(list
, len
);
1849 skb
->len
-= (len
-rlen
);
1850 skb
->data_len
-= (len
-rlen
);
1861 /* API 3.1.3 recvmsg() - UDP Style Syntax
1863 * ssize_t recvmsg(int socket, struct msghdr *message,
1866 * socket - the socket descriptor of the endpoint.
1867 * message - pointer to the msghdr structure which contains a single
1868 * user message and possibly some ancillary data.
1870 * See Section 5 for complete description of the data
1873 * flags - flags sent or received with the user message, see Section
1874 * 5 for complete description of the flags.
1876 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1878 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1879 struct msghdr
*msg
, size_t len
, int noblock
,
1880 int flags
, int *addr_len
)
1882 struct sctp_ulpevent
*event
= NULL
;
1883 struct sctp_sock
*sp
= sctp_sk(sk
);
1884 struct sk_buff
*skb
;
1889 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1890 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1891 "len", len
, "knoblauch", noblock
,
1892 "flags", flags
, "addr_len", addr_len
);
1896 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1901 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1905 /* Get the total length of the skb including any skb's in the
1914 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1916 event
= sctp_skb2event(skb
);
1921 sock_recv_timestamp(msg
, sk
, skb
);
1922 if (sctp_ulpevent_is_notification(event
)) {
1923 msg
->msg_flags
|= MSG_NOTIFICATION
;
1924 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1926 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1929 /* Check if we allow SCTP_SNDRCVINFO. */
1930 if (sp
->subscribe
.sctp_data_io_event
)
1931 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1933 /* FIXME: we should be calling IP/IPv6 layers. */
1934 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1935 ip_cmsg_recv(msg
, skb
);
1940 /* If skb's length exceeds the user's buffer, update the skb and
1941 * push it back to the receive_queue so that the next call to
1942 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1944 if (skb_len
> copied
) {
1945 msg
->msg_flags
&= ~MSG_EOR
;
1946 if (flags
& MSG_PEEK
)
1948 sctp_skb_pull(skb
, copied
);
1949 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1951 /* When only partial message is copied to the user, increase
1952 * rwnd by that amount. If all the data in the skb is read,
1953 * rwnd is updated when the event is freed.
1955 if (!sctp_ulpevent_is_notification(event
))
1956 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
1958 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
1959 (event
->msg_flags
& MSG_EOR
))
1960 msg
->msg_flags
|= MSG_EOR
;
1962 msg
->msg_flags
&= ~MSG_EOR
;
1965 if (flags
& MSG_PEEK
) {
1966 /* Release the skb reference acquired after peeking the skb in
1967 * sctp_skb_recv_datagram().
1971 /* Free the event which includes releasing the reference to
1972 * the owner of the skb, freeing the skb and updating the
1975 sctp_ulpevent_free(event
);
1978 sctp_release_sock(sk
);
1982 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1984 * This option is a on/off flag. If enabled no SCTP message
1985 * fragmentation will be performed. Instead if a message being sent
1986 * exceeds the current PMTU size, the message will NOT be sent and
1987 * instead a error will be indicated to the user.
1989 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
1990 char __user
*optval
, int optlen
)
1994 if (optlen
< sizeof(int))
1997 if (get_user(val
, (int __user
*)optval
))
2000 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
2005 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2008 if (optlen
> sizeof(struct sctp_event_subscribe
))
2010 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2015 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2017 * This socket option is applicable to the UDP-style socket only. When
2018 * set it will cause associations that are idle for more than the
2019 * specified number of seconds to automatically close. An association
2020 * being idle is defined an association that has NOT sent or received
2021 * user data. The special value of '0' indicates that no automatic
2022 * close of any associations should be performed. The option expects an
2023 * integer defining the number of seconds of idle time before an
2024 * association is closed.
2026 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2029 struct sctp_sock
*sp
= sctp_sk(sk
);
2031 /* Applicable to UDP-style socket only */
2032 if (sctp_style(sk
, TCP
))
2034 if (optlen
!= sizeof(int))
2036 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2042 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2044 * Applications can enable or disable heartbeats for any peer address of
2045 * an association, modify an address's heartbeat interval, force a
2046 * heartbeat to be sent immediately, and adjust the address's maximum
2047 * number of retransmissions sent before an address is considered
2048 * unreachable. The following structure is used to access and modify an
2049 * address's parameters:
2051 * struct sctp_paddrparams {
2052 * sctp_assoc_t spp_assoc_id;
2053 * struct sockaddr_storage spp_address;
2054 * uint32_t spp_hbinterval;
2055 * uint16_t spp_pathmaxrxt;
2056 * uint32_t spp_pathmtu;
2057 * uint32_t spp_sackdelay;
2058 * uint32_t spp_flags;
2061 * spp_assoc_id - (one-to-many style socket) This is filled in the
2062 * application, and identifies the association for
2064 * spp_address - This specifies which address is of interest.
2065 * spp_hbinterval - This contains the value of the heartbeat interval,
2066 * in milliseconds. If a value of zero
2067 * is present in this field then no changes are to
2068 * be made to this parameter.
2069 * spp_pathmaxrxt - This contains the maximum number of
2070 * retransmissions before this address shall be
2071 * considered unreachable. If a value of zero
2072 * is present in this field then no changes are to
2073 * be made to this parameter.
2074 * spp_pathmtu - When Path MTU discovery is disabled the value
2075 * specified here will be the "fixed" path mtu.
2076 * Note that if the spp_address field is empty
2077 * then all associations on this address will
2078 * have this fixed path mtu set upon them.
2080 * spp_sackdelay - When delayed sack is enabled, this value specifies
2081 * the number of milliseconds that sacks will be delayed
2082 * for. This value will apply to all addresses of an
2083 * association if the spp_address field is empty. Note
2084 * also, that if delayed sack is enabled and this
2085 * value is set to 0, no change is made to the last
2086 * recorded delayed sack timer value.
2088 * spp_flags - These flags are used to control various features
2089 * on an association. The flag field may contain
2090 * zero or more of the following options.
2092 * SPP_HB_ENABLE - Enable heartbeats on the
2093 * specified address. Note that if the address
2094 * field is empty all addresses for the association
2095 * have heartbeats enabled upon them.
2097 * SPP_HB_DISABLE - Disable heartbeats on the
2098 * speicifed address. Note that if the address
2099 * field is empty all addresses for the association
2100 * will have their heartbeats disabled. Note also
2101 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2102 * mutually exclusive, only one of these two should
2103 * be specified. Enabling both fields will have
2104 * undetermined results.
2106 * SPP_HB_DEMAND - Request a user initiated heartbeat
2107 * to be made immediately.
2109 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2110 * heartbeat delayis to be set to the value of 0
2113 * SPP_PMTUD_ENABLE - This field will enable PMTU
2114 * discovery upon the specified address. Note that
2115 * if the address feild is empty then all addresses
2116 * on the association are effected.
2118 * SPP_PMTUD_DISABLE - This field will disable PMTU
2119 * discovery upon the specified address. Note that
2120 * if the address feild is empty then all addresses
2121 * on the association are effected. Not also that
2122 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2123 * exclusive. Enabling both will have undetermined
2126 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2127 * on delayed sack. The time specified in spp_sackdelay
2128 * is used to specify the sack delay for this address. Note
2129 * that if spp_address is empty then all addresses will
2130 * enable delayed sack and take on the sack delay
2131 * value specified in spp_sackdelay.
2132 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2133 * off delayed sack. If the spp_address field is blank then
2134 * delayed sack is disabled for the entire association. Note
2135 * also that this field is mutually exclusive to
2136 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2139 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2140 struct sctp_transport
*trans
,
2141 struct sctp_association
*asoc
,
2142 struct sctp_sock
*sp
,
2145 int sackdelay_change
)
2149 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2150 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2155 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2156 * this field is ignored. Note also that a value of zero indicates
2157 * the current setting should be left unchanged.
2159 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2161 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2162 * set. This lets us use 0 value when this flag
2165 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2166 params
->spp_hbinterval
= 0;
2168 if (params
->spp_hbinterval
||
2169 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2172 msecs_to_jiffies(params
->spp_hbinterval
);
2175 msecs_to_jiffies(params
->spp_hbinterval
);
2177 sp
->hbinterval
= params
->spp_hbinterval
;
2184 trans
->param_flags
=
2185 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2188 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2191 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2195 /* When Path MTU discovery is disabled the value specified here will
2196 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2197 * include the flag SPP_PMTUD_DISABLE for this field to have any
2200 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2202 trans
->pathmtu
= params
->spp_pathmtu
;
2203 sctp_assoc_sync_pmtu(asoc
);
2205 asoc
->pathmtu
= params
->spp_pathmtu
;
2206 sctp_frag_point(sp
, params
->spp_pathmtu
);
2208 sp
->pathmtu
= params
->spp_pathmtu
;
2214 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2215 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2216 trans
->param_flags
=
2217 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2219 sctp_transport_pmtu(trans
);
2220 sctp_assoc_sync_pmtu(asoc
);
2224 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2227 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2231 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2232 * value of this field is ignored. Note also that a value of zero
2233 * indicates the current setting should be left unchanged.
2235 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2238 msecs_to_jiffies(params
->spp_sackdelay
);
2241 msecs_to_jiffies(params
->spp_sackdelay
);
2243 sp
->sackdelay
= params
->spp_sackdelay
;
2247 if (sackdelay_change
) {
2249 trans
->param_flags
=
2250 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2254 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2258 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2263 /* Note that unless the spp_flag is set to SPP_PMTUD_ENABLE the value
2264 * of this field is ignored. Note also that a value of zero
2265 * indicates the current setting should be left unchanged.
2267 if ((params
->spp_flags
& SPP_PMTUD_ENABLE
) && params
->spp_pathmaxrxt
) {
2269 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2271 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2273 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2280 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2281 char __user
*optval
, int optlen
)
2283 struct sctp_paddrparams params
;
2284 struct sctp_transport
*trans
= NULL
;
2285 struct sctp_association
*asoc
= NULL
;
2286 struct sctp_sock
*sp
= sctp_sk(sk
);
2288 int hb_change
, pmtud_change
, sackdelay_change
;
2290 if (optlen
!= sizeof(struct sctp_paddrparams
))
2293 if (copy_from_user(¶ms
, optval
, optlen
))
2296 /* Validate flags and value parameters. */
2297 hb_change
= params
.spp_flags
& SPP_HB
;
2298 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2299 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2301 if (hb_change
== SPP_HB
||
2302 pmtud_change
== SPP_PMTUD
||
2303 sackdelay_change
== SPP_SACKDELAY
||
2304 params
.spp_sackdelay
> 500 ||
2306 && params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2309 /* If an address other than INADDR_ANY is specified, and
2310 * no transport is found, then the request is invalid.
2312 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
2313 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2314 params
.spp_assoc_id
);
2319 /* Get association, if assoc_id != 0 and the socket is a one
2320 * to many style socket, and an association was not found, then
2321 * the id was invalid.
2323 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2324 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2327 /* Heartbeat demand can only be sent on a transport or
2328 * association, but not a socket.
2330 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2333 /* Process parameters. */
2334 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2335 hb_change
, pmtud_change
,
2341 /* If changes are for association, also apply parameters to each
2344 if (!trans
&& asoc
) {
2345 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2347 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2348 hb_change
, pmtud_change
,
2357 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2359 * This option will effect the way delayed acks are performed. This
2360 * option allows you to get or set the delayed ack time, in
2361 * milliseconds. It also allows changing the delayed ack frequency.
2362 * Changing the frequency to 1 disables the delayed sack algorithm. If
2363 * the assoc_id is 0, then this sets or gets the endpoints default
2364 * values. If the assoc_id field is non-zero, then the set or get
2365 * effects the specified association for the one to many model (the
2366 * assoc_id field is ignored by the one to one model). Note that if
2367 * sack_delay or sack_freq are 0 when setting this option, then the
2368 * current values will remain unchanged.
2370 * struct sctp_sack_info {
2371 * sctp_assoc_t sack_assoc_id;
2372 * uint32_t sack_delay;
2373 * uint32_t sack_freq;
2376 * sack_assoc_id - This parameter, indicates which association the user
2377 * is performing an action upon. Note that if this field's value is
2378 * zero then the endpoints default value is changed (effecting future
2379 * associations only).
2381 * sack_delay - This parameter contains the number of milliseconds that
2382 * the user is requesting the delayed ACK timer be set to. Note that
2383 * this value is defined in the standard to be between 200 and 500
2386 * sack_freq - This parameter contains the number of packets that must
2387 * be received before a sack is sent without waiting for the delay
2388 * timer to expire. The default value for this is 2, setting this
2389 * value to 1 will disable the delayed sack algorithm.
2392 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2393 char __user
*optval
, int optlen
)
2395 struct sctp_sack_info params
;
2396 struct sctp_transport
*trans
= NULL
;
2397 struct sctp_association
*asoc
= NULL
;
2398 struct sctp_sock
*sp
= sctp_sk(sk
);
2400 if (optlen
== sizeof(struct sctp_sack_info
)) {
2401 if (copy_from_user(¶ms
, optval
, optlen
))
2404 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2406 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2407 printk(KERN_WARNING
"SCTP: Use of struct sctp_sack_info "
2408 "in delayed_ack socket option deprecated\n");
2409 printk(KERN_WARNING
"SCTP: struct sctp_sack_info instead\n");
2410 if (copy_from_user(¶ms
, optval
, optlen
))
2413 if (params
.sack_delay
== 0)
2414 params
.sack_freq
= 1;
2416 params
.sack_freq
= 0;
2420 /* Validate value parameter. */
2421 if (params
.sack_delay
> 500)
2424 /* Get association, if sack_assoc_id != 0 and the socket is a one
2425 * to many style socket, and an association was not found, then
2426 * the id was invalid.
2428 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2429 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2432 if (params
.sack_delay
) {
2435 msecs_to_jiffies(params
.sack_delay
);
2437 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2438 SPP_SACKDELAY_ENABLE
;
2440 sp
->sackdelay
= params
.sack_delay
;
2442 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2443 SPP_SACKDELAY_ENABLE
;
2447 if (params
.sack_freq
== 1) {
2450 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2451 SPP_SACKDELAY_DISABLE
;
2454 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2455 SPP_SACKDELAY_DISABLE
;
2457 } else if (params
.sack_freq
> 1) {
2459 asoc
->sackfreq
= params
.sack_freq
;
2461 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2462 SPP_SACKDELAY_ENABLE
;
2464 sp
->sackfreq
= params
.sack_freq
;
2466 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2467 SPP_SACKDELAY_ENABLE
;
2471 /* If change is for association, also apply to each transport. */
2473 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2475 if (params
.sack_delay
) {
2477 msecs_to_jiffies(params
.sack_delay
);
2478 trans
->param_flags
=
2479 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2480 SPP_SACKDELAY_ENABLE
;
2482 if (params
.sack_freq
== 1) {
2483 trans
->param_flags
=
2484 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2485 SPP_SACKDELAY_DISABLE
;
2486 } else if (params
.sack_freq
> 1) {
2487 trans
->sackfreq
= params
.sack_freq
;
2488 trans
->param_flags
=
2489 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2490 SPP_SACKDELAY_ENABLE
;
2498 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2500 * Applications can specify protocol parameters for the default association
2501 * initialization. The option name argument to setsockopt() and getsockopt()
2504 * Setting initialization parameters is effective only on an unconnected
2505 * socket (for UDP-style sockets only future associations are effected
2506 * by the change). With TCP-style sockets, this option is inherited by
2507 * sockets derived from a listener socket.
2509 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, int optlen
)
2511 struct sctp_initmsg sinit
;
2512 struct sctp_sock
*sp
= sctp_sk(sk
);
2514 if (optlen
!= sizeof(struct sctp_initmsg
))
2516 if (copy_from_user(&sinit
, optval
, optlen
))
2519 if (sinit
.sinit_num_ostreams
)
2520 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2521 if (sinit
.sinit_max_instreams
)
2522 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2523 if (sinit
.sinit_max_attempts
)
2524 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2525 if (sinit
.sinit_max_init_timeo
)
2526 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2532 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2534 * Applications that wish to use the sendto() system call may wish to
2535 * specify a default set of parameters that would normally be supplied
2536 * through the inclusion of ancillary data. This socket option allows
2537 * such an application to set the default sctp_sndrcvinfo structure.
2538 * The application that wishes to use this socket option simply passes
2539 * in to this call the sctp_sndrcvinfo structure defined in Section
2540 * 5.2.2) The input parameters accepted by this call include
2541 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2542 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2543 * to this call if the caller is using the UDP model.
2545 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2546 char __user
*optval
, int optlen
)
2548 struct sctp_sndrcvinfo info
;
2549 struct sctp_association
*asoc
;
2550 struct sctp_sock
*sp
= sctp_sk(sk
);
2552 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2554 if (copy_from_user(&info
, optval
, optlen
))
2557 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2558 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2562 asoc
->default_stream
= info
.sinfo_stream
;
2563 asoc
->default_flags
= info
.sinfo_flags
;
2564 asoc
->default_ppid
= info
.sinfo_ppid
;
2565 asoc
->default_context
= info
.sinfo_context
;
2566 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2568 sp
->default_stream
= info
.sinfo_stream
;
2569 sp
->default_flags
= info
.sinfo_flags
;
2570 sp
->default_ppid
= info
.sinfo_ppid
;
2571 sp
->default_context
= info
.sinfo_context
;
2572 sp
->default_timetolive
= info
.sinfo_timetolive
;
2578 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2580 * Requests that the local SCTP stack use the enclosed peer address as
2581 * the association primary. The enclosed address must be one of the
2582 * association peer's addresses.
2584 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2587 struct sctp_prim prim
;
2588 struct sctp_transport
*trans
;
2590 if (optlen
!= sizeof(struct sctp_prim
))
2593 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2596 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2600 sctp_assoc_set_primary(trans
->asoc
, trans
);
2606 * 7.1.5 SCTP_NODELAY
2608 * Turn on/off any Nagle-like algorithm. This means that packets are
2609 * generally sent as soon as possible and no unnecessary delays are
2610 * introduced, at the cost of more packets in the network. Expects an
2611 * integer boolean flag.
2613 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2618 if (optlen
< sizeof(int))
2620 if (get_user(val
, (int __user
*)optval
))
2623 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2629 * 7.1.1 SCTP_RTOINFO
2631 * The protocol parameters used to initialize and bound retransmission
2632 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2633 * and modify these parameters.
2634 * All parameters are time values, in milliseconds. A value of 0, when
2635 * modifying the parameters, indicates that the current value should not
2639 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, int optlen
) {
2640 struct sctp_rtoinfo rtoinfo
;
2641 struct sctp_association
*asoc
;
2643 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2646 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2649 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2651 /* Set the values to the specific association */
2652 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2656 if (rtoinfo
.srto_initial
!= 0)
2658 msecs_to_jiffies(rtoinfo
.srto_initial
);
2659 if (rtoinfo
.srto_max
!= 0)
2660 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2661 if (rtoinfo
.srto_min
!= 0)
2662 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2664 /* If there is no association or the association-id = 0
2665 * set the values to the endpoint.
2667 struct sctp_sock
*sp
= sctp_sk(sk
);
2669 if (rtoinfo
.srto_initial
!= 0)
2670 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2671 if (rtoinfo
.srto_max
!= 0)
2672 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2673 if (rtoinfo
.srto_min
!= 0)
2674 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2682 * 7.1.2 SCTP_ASSOCINFO
2684 * This option is used to tune the maximum retransmission attempts
2685 * of the association.
2686 * Returns an error if the new association retransmission value is
2687 * greater than the sum of the retransmission value of the peer.
2688 * See [SCTP] for more information.
2691 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, int optlen
)
2694 struct sctp_assocparams assocparams
;
2695 struct sctp_association
*asoc
;
2697 if (optlen
!= sizeof(struct sctp_assocparams
))
2699 if (copy_from_user(&assocparams
, optval
, optlen
))
2702 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2704 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2707 /* Set the values to the specific association */
2709 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2712 struct sctp_transport
*peer_addr
;
2714 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
2716 path_sum
+= peer_addr
->pathmaxrxt
;
2720 /* Only validate asocmaxrxt if we have more then
2721 * one path/transport. We do this because path
2722 * retransmissions are only counted when we have more
2726 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2729 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2732 if (assocparams
.sasoc_cookie_life
!= 0) {
2733 asoc
->cookie_life
.tv_sec
=
2734 assocparams
.sasoc_cookie_life
/ 1000;
2735 asoc
->cookie_life
.tv_usec
=
2736 (assocparams
.sasoc_cookie_life
% 1000)
2740 /* Set the values to the endpoint */
2741 struct sctp_sock
*sp
= sctp_sk(sk
);
2743 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2744 sp
->assocparams
.sasoc_asocmaxrxt
=
2745 assocparams
.sasoc_asocmaxrxt
;
2746 if (assocparams
.sasoc_cookie_life
!= 0)
2747 sp
->assocparams
.sasoc_cookie_life
=
2748 assocparams
.sasoc_cookie_life
;
2754 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2756 * This socket option is a boolean flag which turns on or off mapped V4
2757 * addresses. If this option is turned on and the socket is type
2758 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2759 * If this option is turned off, then no mapping will be done of V4
2760 * addresses and a user will receive both PF_INET6 and PF_INET type
2761 * addresses on the socket.
2763 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, int optlen
)
2766 struct sctp_sock
*sp
= sctp_sk(sk
);
2768 if (optlen
< sizeof(int))
2770 if (get_user(val
, (int __user
*)optval
))
2781 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2783 * This socket option specifies the maximum size to put in any outgoing
2784 * SCTP chunk. If a message is larger than this size it will be
2785 * fragmented by SCTP into the specified size. Note that the underlying
2786 * SCTP implementation may fragment into smaller sized chunks when the
2787 * PMTU of the underlying association is smaller than the value set by
2790 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, int optlen
)
2792 struct sctp_association
*asoc
;
2793 struct sctp_sock
*sp
= sctp_sk(sk
);
2796 if (optlen
< sizeof(int))
2798 if (get_user(val
, (int __user
*)optval
))
2800 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2802 sp
->user_frag
= val
;
2804 /* Update the frag_point of the existing associations. */
2805 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
2806 asoc
->frag_point
= sctp_frag_point(sp
, asoc
->pathmtu
);
2814 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2816 * Requests that the peer mark the enclosed address as the association
2817 * primary. The enclosed address must be one of the association's
2818 * locally bound addresses. The following structure is used to make a
2819 * set primary request:
2821 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2824 struct sctp_sock
*sp
;
2825 struct sctp_endpoint
*ep
;
2826 struct sctp_association
*asoc
= NULL
;
2827 struct sctp_setpeerprim prim
;
2828 struct sctp_chunk
*chunk
;
2834 if (!sctp_addip_enable
)
2837 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2840 if (copy_from_user(&prim
, optval
, optlen
))
2843 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2847 if (!asoc
->peer
.asconf_capable
)
2850 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2853 if (!sctp_state(asoc
, ESTABLISHED
))
2856 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2857 return -EADDRNOTAVAIL
;
2859 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2860 chunk
= sctp_make_asconf_set_prim(asoc
,
2861 (union sctp_addr
*)&prim
.sspp_addr
);
2865 err
= sctp_send_asconf(asoc
, chunk
);
2867 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2872 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
2875 struct sctp_setadaptation adaptation
;
2877 if (optlen
!= sizeof(struct sctp_setadaptation
))
2879 if (copy_from_user(&adaptation
, optval
, optlen
))
2882 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
2888 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2890 * The context field in the sctp_sndrcvinfo structure is normally only
2891 * used when a failed message is retrieved holding the value that was
2892 * sent down on the actual send call. This option allows the setting of
2893 * a default context on an association basis that will be received on
2894 * reading messages from the peer. This is especially helpful in the
2895 * one-2-many model for an application to keep some reference to an
2896 * internal state machine that is processing messages on the
2897 * association. Note that the setting of this value only effects
2898 * received messages from the peer and does not effect the value that is
2899 * saved with outbound messages.
2901 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
2904 struct sctp_assoc_value params
;
2905 struct sctp_sock
*sp
;
2906 struct sctp_association
*asoc
;
2908 if (optlen
!= sizeof(struct sctp_assoc_value
))
2910 if (copy_from_user(¶ms
, optval
, optlen
))
2915 if (params
.assoc_id
!= 0) {
2916 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2919 asoc
->default_rcv_context
= params
.assoc_value
;
2921 sp
->default_rcv_context
= params
.assoc_value
;
2928 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
2930 * This options will at a minimum specify if the implementation is doing
2931 * fragmented interleave. Fragmented interleave, for a one to many
2932 * socket, is when subsequent calls to receive a message may return
2933 * parts of messages from different associations. Some implementations
2934 * may allow you to turn this value on or off. If so, when turned off,
2935 * no fragment interleave will occur (which will cause a head of line
2936 * blocking amongst multiple associations sharing the same one to many
2937 * socket). When this option is turned on, then each receive call may
2938 * come from a different association (thus the user must receive data
2939 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
2940 * association each receive belongs to.
2942 * This option takes a boolean value. A non-zero value indicates that
2943 * fragmented interleave is on. A value of zero indicates that
2944 * fragmented interleave is off.
2946 * Note that it is important that an implementation that allows this
2947 * option to be turned on, have it off by default. Otherwise an unaware
2948 * application using the one to many model may become confused and act
2951 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
2952 char __user
*optval
,
2957 if (optlen
!= sizeof(int))
2959 if (get_user(val
, (int __user
*)optval
))
2962 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
2968 * 7.1.25. Set or Get the sctp partial delivery point
2969 * (SCTP_PARTIAL_DELIVERY_POINT)
2970 * This option will set or get the SCTP partial delivery point. This
2971 * point is the size of a message where the partial delivery API will be
2972 * invoked to help free up rwnd space for the peer. Setting this to a
2973 * lower value will cause partial delivery's to happen more often. The
2974 * calls argument is an integer that sets or gets the partial delivery
2977 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
2978 char __user
*optval
,
2983 if (optlen
!= sizeof(u32
))
2985 if (get_user(val
, (int __user
*)optval
))
2988 sctp_sk(sk
)->pd_point
= val
;
2990 return 0; /* is this the right error code? */
2994 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
2996 * This option will allow a user to change the maximum burst of packets
2997 * that can be emitted by this association. Note that the default value
2998 * is 4, and some implementations may restrict this setting so that it
2999 * can only be lowered.
3001 * NOTE: This text doesn't seem right. Do this on a socket basis with
3002 * future associations inheriting the socket value.
3004 static int sctp_setsockopt_maxburst(struct sock
*sk
,
3005 char __user
*optval
,
3008 struct sctp_assoc_value params
;
3009 struct sctp_sock
*sp
;
3010 struct sctp_association
*asoc
;
3014 if (optlen
< sizeof(int))
3017 if (optlen
== sizeof(int)) {
3019 "SCTP: Use of int in max_burst socket option deprecated\n");
3021 "SCTP: Use struct sctp_assoc_value instead\n");
3022 if (copy_from_user(&val
, optval
, optlen
))
3024 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3025 if (copy_from_user(¶ms
, optval
, optlen
))
3027 val
= params
.assoc_value
;
3028 assoc_id
= params
.assoc_id
;
3034 if (assoc_id
!= 0) {
3035 asoc
= sctp_id2assoc(sk
, assoc_id
);
3038 asoc
->max_burst
= val
;
3040 sp
->max_burst
= val
;
3046 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3048 * This set option adds a chunk type that the user is requesting to be
3049 * received only in an authenticated way. Changes to the list of chunks
3050 * will only effect future associations on the socket.
3052 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
3053 char __user
*optval
,
3056 struct sctp_authchunk val
;
3058 if (optlen
!= sizeof(struct sctp_authchunk
))
3060 if (copy_from_user(&val
, optval
, optlen
))
3063 switch (val
.sauth_chunk
) {
3065 case SCTP_CID_INIT_ACK
:
3066 case SCTP_CID_SHUTDOWN_COMPLETE
:
3071 /* add this chunk id to the endpoint */
3072 return sctp_auth_ep_add_chunkid(sctp_sk(sk
)->ep
, val
.sauth_chunk
);
3076 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3078 * This option gets or sets the list of HMAC algorithms that the local
3079 * endpoint requires the peer to use.
3081 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
3082 char __user
*optval
,
3085 struct sctp_hmacalgo
*hmacs
;
3088 if (optlen
< sizeof(struct sctp_hmacalgo
))
3091 hmacs
= kmalloc(optlen
, GFP_KERNEL
);
3095 if (copy_from_user(hmacs
, optval
, optlen
)) {
3100 if (hmacs
->shmac_num_idents
== 0 ||
3101 hmacs
->shmac_num_idents
> SCTP_AUTH_NUM_HMACS
) {
3106 err
= sctp_auth_ep_set_hmacs(sctp_sk(sk
)->ep
, hmacs
);
3113 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3115 * This option will set a shared secret key which is used to build an
3116 * association shared key.
3118 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3119 char __user
*optval
,
3122 struct sctp_authkey
*authkey
;
3123 struct sctp_association
*asoc
;
3126 if (optlen
<= sizeof(struct sctp_authkey
))
3129 authkey
= kmalloc(optlen
, GFP_KERNEL
);
3133 if (copy_from_user(authkey
, optval
, optlen
)) {
3138 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3139 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3144 ret
= sctp_auth_set_key(sctp_sk(sk
)->ep
, asoc
, authkey
);
3151 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3153 * This option will get or set the active shared key to be used to build
3154 * the association shared key.
3156 static int sctp_setsockopt_active_key(struct sock
*sk
,
3157 char __user
*optval
,
3160 struct sctp_authkeyid val
;
3161 struct sctp_association
*asoc
;
3163 if (optlen
!= sizeof(struct sctp_authkeyid
))
3165 if (copy_from_user(&val
, optval
, optlen
))
3168 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3169 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3172 return sctp_auth_set_active_key(sctp_sk(sk
)->ep
, asoc
,
3173 val
.scact_keynumber
);
3177 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3179 * This set option will delete a shared secret key from use.
3181 static int sctp_setsockopt_del_key(struct sock
*sk
,
3182 char __user
*optval
,
3185 struct sctp_authkeyid val
;
3186 struct sctp_association
*asoc
;
3188 if (optlen
!= sizeof(struct sctp_authkeyid
))
3190 if (copy_from_user(&val
, optval
, optlen
))
3193 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3194 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3197 return sctp_auth_del_key_id(sctp_sk(sk
)->ep
, asoc
,
3198 val
.scact_keynumber
);
3203 /* API 6.2 setsockopt(), getsockopt()
3205 * Applications use setsockopt() and getsockopt() to set or retrieve
3206 * socket options. Socket options are used to change the default
3207 * behavior of sockets calls. They are described in Section 7.
3211 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3212 * int __user *optlen);
3213 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3216 * sd - the socket descript.
3217 * level - set to IPPROTO_SCTP for all SCTP options.
3218 * optname - the option name.
3219 * optval - the buffer to store the value of the option.
3220 * optlen - the size of the buffer.
3222 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3223 char __user
*optval
, int optlen
)
3227 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3230 /* I can hardly begin to describe how wrong this is. This is
3231 * so broken as to be worse than useless. The API draft
3232 * REALLY is NOT helpful here... I am not convinced that the
3233 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3234 * are at all well-founded.
3236 if (level
!= SOL_SCTP
) {
3237 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3238 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3245 case SCTP_SOCKOPT_BINDX_ADD
:
3246 /* 'optlen' is the size of the addresses buffer. */
3247 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3248 optlen
, SCTP_BINDX_ADD_ADDR
);
3251 case SCTP_SOCKOPT_BINDX_REM
:
3252 /* 'optlen' is the size of the addresses buffer. */
3253 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3254 optlen
, SCTP_BINDX_REM_ADDR
);
3257 case SCTP_SOCKOPT_CONNECTX_OLD
:
3258 /* 'optlen' is the size of the addresses buffer. */
3259 retval
= sctp_setsockopt_connectx_old(sk
,
3260 (struct sockaddr __user
*)optval
,
3264 case SCTP_SOCKOPT_CONNECTX
:
3265 /* 'optlen' is the size of the addresses buffer. */
3266 retval
= sctp_setsockopt_connectx(sk
,
3267 (struct sockaddr __user
*)optval
,
3271 case SCTP_DISABLE_FRAGMENTS
:
3272 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3276 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3279 case SCTP_AUTOCLOSE
:
3280 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3283 case SCTP_PEER_ADDR_PARAMS
:
3284 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3287 case SCTP_DELAYED_ACK
:
3288 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3290 case SCTP_PARTIAL_DELIVERY_POINT
:
3291 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3295 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3297 case SCTP_DEFAULT_SEND_PARAM
:
3298 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3301 case SCTP_PRIMARY_ADDR
:
3302 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3304 case SCTP_SET_PEER_PRIMARY_ADDR
:
3305 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3308 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3311 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3313 case SCTP_ASSOCINFO
:
3314 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3316 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3317 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3320 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3322 case SCTP_ADAPTATION_LAYER
:
3323 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3326 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3328 case SCTP_FRAGMENT_INTERLEAVE
:
3329 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3331 case SCTP_MAX_BURST
:
3332 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3334 case SCTP_AUTH_CHUNK
:
3335 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3337 case SCTP_HMAC_IDENT
:
3338 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3341 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3343 case SCTP_AUTH_ACTIVE_KEY
:
3344 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3346 case SCTP_AUTH_DELETE_KEY
:
3347 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3350 retval
= -ENOPROTOOPT
;
3354 sctp_release_sock(sk
);
3360 /* API 3.1.6 connect() - UDP Style Syntax
3362 * An application may use the connect() call in the UDP model to initiate an
3363 * association without sending data.
3367 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3369 * sd: the socket descriptor to have a new association added to.
3371 * nam: the address structure (either struct sockaddr_in or struct
3372 * sockaddr_in6 defined in RFC2553 [7]).
3374 * len: the size of the address.
3376 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3384 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3385 __func__
, sk
, addr
, addr_len
);
3387 /* Validate addr_len before calling common connect/connectx routine. */
3388 af
= sctp_get_af_specific(addr
->sa_family
);
3389 if (!af
|| addr_len
< af
->sockaddr_len
) {
3392 /* Pass correct addr len to common routine (so it knows there
3393 * is only one address being passed.
3395 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
3398 sctp_release_sock(sk
);
3402 /* FIXME: Write comments. */
3403 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
3405 return -EOPNOTSUPP
; /* STUB */
3408 /* 4.1.4 accept() - TCP Style Syntax
3410 * Applications use accept() call to remove an established SCTP
3411 * association from the accept queue of the endpoint. A new socket
3412 * descriptor will be returned from accept() to represent the newly
3413 * formed association.
3415 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3417 struct sctp_sock
*sp
;
3418 struct sctp_endpoint
*ep
;
3419 struct sock
*newsk
= NULL
;
3420 struct sctp_association
*asoc
;
3429 if (!sctp_style(sk
, TCP
)) {
3430 error
= -EOPNOTSUPP
;
3434 if (!sctp_sstate(sk
, LISTENING
)) {
3439 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3441 error
= sctp_wait_for_accept(sk
, timeo
);
3445 /* We treat the list of associations on the endpoint as the accept
3446 * queue and pick the first association on the list.
3448 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3450 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3456 /* Populate the fields of the newsk from the oldsk and migrate the
3457 * asoc to the newsk.
3459 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3462 sctp_release_sock(sk
);
3467 /* The SCTP ioctl handler. */
3468 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3470 return -ENOIOCTLCMD
;
3473 /* This is the function which gets called during socket creation to
3474 * initialized the SCTP-specific portion of the sock.
3475 * The sock structure should already be zero-filled memory.
3477 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
3479 struct sctp_endpoint
*ep
;
3480 struct sctp_sock
*sp
;
3482 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3486 /* Initialize the SCTP per socket area. */
3487 switch (sk
->sk_type
) {
3488 case SOCK_SEQPACKET
:
3489 sp
->type
= SCTP_SOCKET_UDP
;
3492 sp
->type
= SCTP_SOCKET_TCP
;
3495 return -ESOCKTNOSUPPORT
;
3498 /* Initialize default send parameters. These parameters can be
3499 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3501 sp
->default_stream
= 0;
3502 sp
->default_ppid
= 0;
3503 sp
->default_flags
= 0;
3504 sp
->default_context
= 0;
3505 sp
->default_timetolive
= 0;
3507 sp
->default_rcv_context
= 0;
3508 sp
->max_burst
= sctp_max_burst
;
3510 /* Initialize default setup parameters. These parameters
3511 * can be modified with the SCTP_INITMSG socket option or
3512 * overridden by the SCTP_INIT CMSG.
3514 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3515 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3516 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3517 sp
->initmsg
.sinit_max_init_timeo
= sctp_rto_max
;
3519 /* Initialize default RTO related parameters. These parameters can
3520 * be modified for with the SCTP_RTOINFO socket option.
3522 sp
->rtoinfo
.srto_initial
= sctp_rto_initial
;
3523 sp
->rtoinfo
.srto_max
= sctp_rto_max
;
3524 sp
->rtoinfo
.srto_min
= sctp_rto_min
;
3526 /* Initialize default association related parameters. These parameters
3527 * can be modified with the SCTP_ASSOCINFO socket option.
3529 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3530 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3531 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3532 sp
->assocparams
.sasoc_local_rwnd
= 0;
3533 sp
->assocparams
.sasoc_cookie_life
= sctp_valid_cookie_life
;
3535 /* Initialize default event subscriptions. By default, all the
3538 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3540 /* Default Peer Address Parameters. These defaults can
3541 * be modified via SCTP_PEER_ADDR_PARAMS
3543 sp
->hbinterval
= sctp_hb_interval
;
3544 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3545 sp
->pathmtu
= 0; // allow default discovery
3546 sp
->sackdelay
= sctp_sack_timeout
;
3548 sp
->param_flags
= SPP_HB_ENABLE
|
3550 SPP_SACKDELAY_ENABLE
;
3552 /* If enabled no SCTP message fragmentation will be performed.
3553 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3555 sp
->disable_fragments
= 0;
3557 /* Enable Nagle algorithm by default. */
3560 /* Enable by default. */
3563 /* Auto-close idle associations after the configured
3564 * number of seconds. A value of 0 disables this
3565 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3566 * for UDP-style sockets only.
3570 /* User specified fragmentation limit. */
3573 sp
->adaptation_ind
= 0;
3575 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3577 /* Control variables for partial data delivery. */
3578 atomic_set(&sp
->pd_mode
, 0);
3579 skb_queue_head_init(&sp
->pd_lobby
);
3580 sp
->frag_interleave
= 0;
3582 /* Create a per socket endpoint structure. Even if we
3583 * change the data structure relationships, this may still
3584 * be useful for storing pre-connect address information.
3586 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3593 SCTP_DBG_OBJCNT_INC(sock
);
3594 atomic_inc(&sctp_sockets_allocated
);
3598 /* Cleanup any SCTP per socket resources. */
3599 SCTP_STATIC
void sctp_destroy_sock(struct sock
*sk
)
3601 struct sctp_endpoint
*ep
;
3603 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3605 /* Release our hold on the endpoint. */
3606 ep
= sctp_sk(sk
)->ep
;
3607 sctp_endpoint_free(ep
);
3608 atomic_dec(&sctp_sockets_allocated
);
3611 /* API 4.1.7 shutdown() - TCP Style Syntax
3612 * int shutdown(int socket, int how);
3614 * sd - the socket descriptor of the association to be closed.
3615 * how - Specifies the type of shutdown. The values are
3618 * Disables further receive operations. No SCTP
3619 * protocol action is taken.
3621 * Disables further send operations, and initiates
3622 * the SCTP shutdown sequence.
3624 * Disables further send and receive operations
3625 * and initiates the SCTP shutdown sequence.
3627 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3629 struct sctp_endpoint
*ep
;
3630 struct sctp_association
*asoc
;
3632 if (!sctp_style(sk
, TCP
))
3635 if (how
& SEND_SHUTDOWN
) {
3636 ep
= sctp_sk(sk
)->ep
;
3637 if (!list_empty(&ep
->asocs
)) {
3638 asoc
= list_entry(ep
->asocs
.next
,
3639 struct sctp_association
, asocs
);
3640 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3645 /* 7.2.1 Association Status (SCTP_STATUS)
3647 * Applications can retrieve current status information about an
3648 * association, including association state, peer receiver window size,
3649 * number of unacked data chunks, and number of data chunks pending
3650 * receipt. This information is read-only.
3652 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3653 char __user
*optval
,
3656 struct sctp_status status
;
3657 struct sctp_association
*asoc
= NULL
;
3658 struct sctp_transport
*transport
;
3659 sctp_assoc_t associd
;
3662 if (len
< sizeof(status
)) {
3667 len
= sizeof(status
);
3668 if (copy_from_user(&status
, optval
, len
)) {
3673 associd
= status
.sstat_assoc_id
;
3674 asoc
= sctp_id2assoc(sk
, associd
);
3680 transport
= asoc
->peer
.primary_path
;
3682 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3683 status
.sstat_state
= asoc
->state
;
3684 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3685 status
.sstat_unackdata
= asoc
->unack_data
;
3687 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3688 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3689 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3690 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3691 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3692 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
3693 transport
->af_specific
->sockaddr_len
);
3694 /* Map ipv4 address into v4-mapped-on-v6 address. */
3695 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3696 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3697 status
.sstat_primary
.spinfo_state
= transport
->state
;
3698 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3699 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3700 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3701 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3703 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3704 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3706 if (put_user(len
, optlen
)) {
3711 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3712 len
, status
.sstat_state
, status
.sstat_rwnd
,
3713 status
.sstat_assoc_id
);
3715 if (copy_to_user(optval
, &status
, len
)) {
3725 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3727 * Applications can retrieve information about a specific peer address
3728 * of an association, including its reachability state, congestion
3729 * window, and retransmission timer values. This information is
3732 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3733 char __user
*optval
,
3736 struct sctp_paddrinfo pinfo
;
3737 struct sctp_transport
*transport
;
3740 if (len
< sizeof(pinfo
)) {
3745 len
= sizeof(pinfo
);
3746 if (copy_from_user(&pinfo
, optval
, len
)) {
3751 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3752 pinfo
.spinfo_assoc_id
);
3756 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3757 pinfo
.spinfo_state
= transport
->state
;
3758 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3759 pinfo
.spinfo_srtt
= transport
->srtt
;
3760 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3761 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3763 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3764 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3766 if (put_user(len
, optlen
)) {
3771 if (copy_to_user(optval
, &pinfo
, len
)) {
3780 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3782 * This option is a on/off flag. If enabled no SCTP message
3783 * fragmentation will be performed. Instead if a message being sent
3784 * exceeds the current PMTU size, the message will NOT be sent and
3785 * instead a error will be indicated to the user.
3787 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3788 char __user
*optval
, int __user
*optlen
)
3792 if (len
< sizeof(int))
3796 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3797 if (put_user(len
, optlen
))
3799 if (copy_to_user(optval
, &val
, len
))
3804 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3806 * This socket option is used to specify various notifications and
3807 * ancillary data the user wishes to receive.
3809 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
3812 if (len
< sizeof(struct sctp_event_subscribe
))
3814 len
= sizeof(struct sctp_event_subscribe
);
3815 if (put_user(len
, optlen
))
3817 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
3822 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3824 * This socket option is applicable to the UDP-style socket only. When
3825 * set it will cause associations that are idle for more than the
3826 * specified number of seconds to automatically close. An association
3827 * being idle is defined an association that has NOT sent or received
3828 * user data. The special value of '0' indicates that no automatic
3829 * close of any associations should be performed. The option expects an
3830 * integer defining the number of seconds of idle time before an
3831 * association is closed.
3833 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3835 /* Applicable to UDP-style socket only */
3836 if (sctp_style(sk
, TCP
))
3838 if (len
< sizeof(int))
3841 if (put_user(len
, optlen
))
3843 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
3848 /* Helper routine to branch off an association to a new socket. */
3849 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3850 struct socket
**sockp
)
3852 struct sock
*sk
= asoc
->base
.sk
;
3853 struct socket
*sock
;
3854 struct inet_sock
*inetsk
;
3858 /* An association cannot be branched off from an already peeled-off
3859 * socket, nor is this supported for tcp style sockets.
3861 if (!sctp_style(sk
, UDP
))
3864 /* Create a new socket. */
3865 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
3869 /* Populate the fields of the newsk from the oldsk and migrate the
3870 * asoc to the newsk.
3872 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
3874 /* Make peeled-off sockets more like 1-1 accepted sockets.
3875 * Set the daddr and initialize id to something more random
3877 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
3878 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
3879 inetsk
= inet_sk(sock
->sk
);
3880 inetsk
->id
= asoc
->next_tsn
^ jiffies
;
3887 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3889 sctp_peeloff_arg_t peeloff
;
3890 struct socket
*newsock
;
3892 struct sctp_association
*asoc
;
3894 if (len
< sizeof(sctp_peeloff_arg_t
))
3896 len
= sizeof(sctp_peeloff_arg_t
);
3897 if (copy_from_user(&peeloff
, optval
, len
))
3900 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
3906 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__
, sk
, asoc
);
3908 retval
= sctp_do_peeloff(asoc
, &newsock
);
3912 /* Map the socket to an unused fd that can be returned to the user. */
3913 retval
= sock_map_fd(newsock
);
3915 sock_release(newsock
);
3919 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3920 __func__
, sk
, asoc
, newsock
->sk
, retval
);
3922 /* Return the fd mapped to the new socket. */
3923 peeloff
.sd
= retval
;
3924 if (put_user(len
, optlen
))
3926 if (copy_to_user(optval
, &peeloff
, len
))
3933 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3935 * Applications can enable or disable heartbeats for any peer address of
3936 * an association, modify an address's heartbeat interval, force a
3937 * heartbeat to be sent immediately, and adjust the address's maximum
3938 * number of retransmissions sent before an address is considered
3939 * unreachable. The following structure is used to access and modify an
3940 * address's parameters:
3942 * struct sctp_paddrparams {
3943 * sctp_assoc_t spp_assoc_id;
3944 * struct sockaddr_storage spp_address;
3945 * uint32_t spp_hbinterval;
3946 * uint16_t spp_pathmaxrxt;
3947 * uint32_t spp_pathmtu;
3948 * uint32_t spp_sackdelay;
3949 * uint32_t spp_flags;
3952 * spp_assoc_id - (one-to-many style socket) This is filled in the
3953 * application, and identifies the association for
3955 * spp_address - This specifies which address is of interest.
3956 * spp_hbinterval - This contains the value of the heartbeat interval,
3957 * in milliseconds. If a value of zero
3958 * is present in this field then no changes are to
3959 * be made to this parameter.
3960 * spp_pathmaxrxt - This contains the maximum number of
3961 * retransmissions before this address shall be
3962 * considered unreachable. If a value of zero
3963 * is present in this field then no changes are to
3964 * be made to this parameter.
3965 * spp_pathmtu - When Path MTU discovery is disabled the value
3966 * specified here will be the "fixed" path mtu.
3967 * Note that if the spp_address field is empty
3968 * then all associations on this address will
3969 * have this fixed path mtu set upon them.
3971 * spp_sackdelay - When delayed sack is enabled, this value specifies
3972 * the number of milliseconds that sacks will be delayed
3973 * for. This value will apply to all addresses of an
3974 * association if the spp_address field is empty. Note
3975 * also, that if delayed sack is enabled and this
3976 * value is set to 0, no change is made to the last
3977 * recorded delayed sack timer value.
3979 * spp_flags - These flags are used to control various features
3980 * on an association. The flag field may contain
3981 * zero or more of the following options.
3983 * SPP_HB_ENABLE - Enable heartbeats on the
3984 * specified address. Note that if the address
3985 * field is empty all addresses for the association
3986 * have heartbeats enabled upon them.
3988 * SPP_HB_DISABLE - Disable heartbeats on the
3989 * speicifed address. Note that if the address
3990 * field is empty all addresses for the association
3991 * will have their heartbeats disabled. Note also
3992 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
3993 * mutually exclusive, only one of these two should
3994 * be specified. Enabling both fields will have
3995 * undetermined results.
3997 * SPP_HB_DEMAND - Request a user initiated heartbeat
3998 * to be made immediately.
4000 * SPP_PMTUD_ENABLE - This field will enable PMTU
4001 * discovery upon the specified address. Note that
4002 * if the address feild is empty then all addresses
4003 * on the association are effected.
4005 * SPP_PMTUD_DISABLE - This field will disable PMTU
4006 * discovery upon the specified address. Note that
4007 * if the address feild is empty then all addresses
4008 * on the association are effected. Not also that
4009 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4010 * exclusive. Enabling both will have undetermined
4013 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4014 * on delayed sack. The time specified in spp_sackdelay
4015 * is used to specify the sack delay for this address. Note
4016 * that if spp_address is empty then all addresses will
4017 * enable delayed sack and take on the sack delay
4018 * value specified in spp_sackdelay.
4019 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4020 * off delayed sack. If the spp_address field is blank then
4021 * delayed sack is disabled for the entire association. Note
4022 * also that this field is mutually exclusive to
4023 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4026 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
4027 char __user
*optval
, int __user
*optlen
)
4029 struct sctp_paddrparams params
;
4030 struct sctp_transport
*trans
= NULL
;
4031 struct sctp_association
*asoc
= NULL
;
4032 struct sctp_sock
*sp
= sctp_sk(sk
);
4034 if (len
< sizeof(struct sctp_paddrparams
))
4036 len
= sizeof(struct sctp_paddrparams
);
4037 if (copy_from_user(¶ms
, optval
, len
))
4040 /* If an address other than INADDR_ANY is specified, and
4041 * no transport is found, then the request is invalid.
4043 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
4044 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
4045 params
.spp_assoc_id
);
4047 SCTP_DEBUG_PRINTK("Failed no transport\n");
4052 /* Get association, if assoc_id != 0 and the socket is a one
4053 * to many style socket, and an association was not found, then
4054 * the id was invalid.
4056 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
4057 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
4058 SCTP_DEBUG_PRINTK("Failed no association\n");
4063 /* Fetch transport values. */
4064 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
4065 params
.spp_pathmtu
= trans
->pathmtu
;
4066 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
4067 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
4069 /*draft-11 doesn't say what to return in spp_flags*/
4070 params
.spp_flags
= trans
->param_flags
;
4072 /* Fetch association values. */
4073 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
4074 params
.spp_pathmtu
= asoc
->pathmtu
;
4075 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
4076 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
4078 /*draft-11 doesn't say what to return in spp_flags*/
4079 params
.spp_flags
= asoc
->param_flags
;
4081 /* Fetch socket values. */
4082 params
.spp_hbinterval
= sp
->hbinterval
;
4083 params
.spp_pathmtu
= sp
->pathmtu
;
4084 params
.spp_sackdelay
= sp
->sackdelay
;
4085 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
4087 /*draft-11 doesn't say what to return in spp_flags*/
4088 params
.spp_flags
= sp
->param_flags
;
4091 if (copy_to_user(optval
, ¶ms
, len
))
4094 if (put_user(len
, optlen
))
4101 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4103 * This option will effect the way delayed acks are performed. This
4104 * option allows you to get or set the delayed ack time, in
4105 * milliseconds. It also allows changing the delayed ack frequency.
4106 * Changing the frequency to 1 disables the delayed sack algorithm. If
4107 * the assoc_id is 0, then this sets or gets the endpoints default
4108 * values. If the assoc_id field is non-zero, then the set or get
4109 * effects the specified association for the one to many model (the
4110 * assoc_id field is ignored by the one to one model). Note that if
4111 * sack_delay or sack_freq are 0 when setting this option, then the
4112 * current values will remain unchanged.
4114 * struct sctp_sack_info {
4115 * sctp_assoc_t sack_assoc_id;
4116 * uint32_t sack_delay;
4117 * uint32_t sack_freq;
4120 * sack_assoc_id - This parameter, indicates which association the user
4121 * is performing an action upon. Note that if this field's value is
4122 * zero then the endpoints default value is changed (effecting future
4123 * associations only).
4125 * sack_delay - This parameter contains the number of milliseconds that
4126 * the user is requesting the delayed ACK timer be set to. Note that
4127 * this value is defined in the standard to be between 200 and 500
4130 * sack_freq - This parameter contains the number of packets that must
4131 * be received before a sack is sent without waiting for the delay
4132 * timer to expire. The default value for this is 2, setting this
4133 * value to 1 will disable the delayed sack algorithm.
4135 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
4136 char __user
*optval
,
4139 struct sctp_sack_info params
;
4140 struct sctp_association
*asoc
= NULL
;
4141 struct sctp_sock
*sp
= sctp_sk(sk
);
4143 if (len
>= sizeof(struct sctp_sack_info
)) {
4144 len
= sizeof(struct sctp_sack_info
);
4146 if (copy_from_user(¶ms
, optval
, len
))
4148 } else if (len
== sizeof(struct sctp_assoc_value
)) {
4149 printk(KERN_WARNING
"SCTP: Use of struct sctp_sack_info "
4150 "in delayed_ack socket option deprecated\n");
4151 printk(KERN_WARNING
"SCTP: struct sctp_sack_info instead\n");
4152 if (copy_from_user(¶ms
, optval
, len
))
4157 /* Get association, if sack_assoc_id != 0 and the socket is a one
4158 * to many style socket, and an association was not found, then
4159 * the id was invalid.
4161 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
4162 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
4166 /* Fetch association values. */
4167 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4168 params
.sack_delay
= jiffies_to_msecs(
4170 params
.sack_freq
= asoc
->sackfreq
;
4173 params
.sack_delay
= 0;
4174 params
.sack_freq
= 1;
4177 /* Fetch socket values. */
4178 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4179 params
.sack_delay
= sp
->sackdelay
;
4180 params
.sack_freq
= sp
->sackfreq
;
4182 params
.sack_delay
= 0;
4183 params
.sack_freq
= 1;
4187 if (copy_to_user(optval
, ¶ms
, len
))
4190 if (put_user(len
, optlen
))
4196 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4198 * Applications can specify protocol parameters for the default association
4199 * initialization. The option name argument to setsockopt() and getsockopt()
4202 * Setting initialization parameters is effective only on an unconnected
4203 * socket (for UDP-style sockets only future associations are effected
4204 * by the change). With TCP-style sockets, this option is inherited by
4205 * sockets derived from a listener socket.
4207 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4209 if (len
< sizeof(struct sctp_initmsg
))
4211 len
= sizeof(struct sctp_initmsg
);
4212 if (put_user(len
, optlen
))
4214 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
4219 static int sctp_getsockopt_peer_addrs_num_old(struct sock
*sk
, int len
,
4220 char __user
*optval
,
4224 struct sctp_association
*asoc
;
4225 struct list_head
*pos
;
4228 if (len
< sizeof(sctp_assoc_t
))
4231 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
4234 printk(KERN_WARNING
"SCTP: Use of SCTP_GET_PEER_ADDRS_NUM_OLD "
4235 "socket option deprecated\n");
4236 /* For UDP-style sockets, id specifies the association to query. */
4237 asoc
= sctp_id2assoc(sk
, id
);
4241 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4249 * Old API for getting list of peer addresses. Does not work for 32-bit
4250 * programs running on a 64-bit kernel
4252 static int sctp_getsockopt_peer_addrs_old(struct sock
*sk
, int len
,
4253 char __user
*optval
,
4256 struct sctp_association
*asoc
;
4258 struct sctp_getaddrs_old getaddrs
;
4259 struct sctp_transport
*from
;
4261 union sctp_addr temp
;
4262 struct sctp_sock
*sp
= sctp_sk(sk
);
4265 if (len
< sizeof(struct sctp_getaddrs_old
))
4268 len
= sizeof(struct sctp_getaddrs_old
);
4270 if (copy_from_user(&getaddrs
, optval
, len
))
4273 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
4275 printk(KERN_WARNING
"SCTP: Use of SCTP_GET_PEER_ADDRS_OLD "
4276 "socket option deprecated\n");
4278 /* For UDP-style sockets, id specifies the association to query. */
4279 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4283 to
= (void __user
*)getaddrs
.addrs
;
4284 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
4286 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4287 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4288 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
4289 if (copy_to_user(to
, &temp
, addrlen
))
4293 if (cnt
>= getaddrs
.addr_num
) break;
4295 getaddrs
.addr_num
= cnt
;
4296 if (put_user(len
, optlen
))
4298 if (copy_to_user(optval
, &getaddrs
, len
))
4304 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4305 char __user
*optval
, int __user
*optlen
)
4307 struct sctp_association
*asoc
;
4309 struct sctp_getaddrs getaddrs
;
4310 struct sctp_transport
*from
;
4312 union sctp_addr temp
;
4313 struct sctp_sock
*sp
= sctp_sk(sk
);
4318 if (len
< sizeof(struct sctp_getaddrs
))
4321 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4324 /* For UDP-style sockets, id specifies the association to query. */
4325 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4329 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4330 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4332 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
4334 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4335 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4336 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
4337 if (space_left
< addrlen
)
4339 if (copy_to_user(to
, &temp
, addrlen
))
4343 space_left
-= addrlen
;
4346 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4348 bytes_copied
= ((char __user
*)to
) - optval
;
4349 if (put_user(bytes_copied
, optlen
))
4355 static int sctp_getsockopt_local_addrs_num_old(struct sock
*sk
, int len
,
4356 char __user
*optval
,
4360 struct sctp_bind_addr
*bp
;
4361 struct sctp_association
*asoc
;
4362 struct sctp_sockaddr_entry
*addr
;
4365 if (len
< sizeof(sctp_assoc_t
))
4368 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
4371 printk(KERN_WARNING
"SCTP: Use of SCTP_GET_LOCAL_ADDRS_NUM_OLD "
4372 "socket option deprecated\n");
4375 * For UDP-style sockets, id specifies the association to query.
4376 * If the id field is set to the value '0' then the locally bound
4377 * addresses are returned without regard to any particular
4381 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4383 asoc
= sctp_id2assoc(sk
, id
);
4386 bp
= &asoc
->base
.bind_addr
;
4389 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
4390 * addresses from the global local address list.
4392 if (sctp_list_single_entry(&bp
->address_list
)) {
4393 addr
= list_entry(bp
->address_list
.next
,
4394 struct sctp_sockaddr_entry
, list
);
4395 if (sctp_is_any(&addr
->a
)) {
4397 list_for_each_entry_rcu(addr
,
4398 &sctp_local_addr_list
, list
) {
4402 if ((PF_INET
== sk
->sk_family
) &&
4403 (AF_INET6
== addr
->a
.sa
.sa_family
))
4406 if ((PF_INET6
== sk
->sk_family
) &&
4407 inet_v6_ipv6only(sk
) &&
4408 (AF_INET
== addr
->a
.sa
.sa_family
))
4420 /* Protection on the bound address list is not needed,
4421 * since in the socket option context we hold the socket lock,
4422 * so there is no way that the bound address list can change.
4424 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4431 /* Helper function that copies local addresses to user and returns the number
4432 * of addresses copied.
4434 static int sctp_copy_laddrs_old(struct sock
*sk
, __u16 port
,
4435 int max_addrs
, void *to
,
4438 struct sctp_sockaddr_entry
*addr
;
4439 union sctp_addr temp
;
4444 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
4448 if ((PF_INET
== sk
->sk_family
) &&
4449 (AF_INET6
== addr
->a
.sa
.sa_family
))
4451 if ((PF_INET6
== sk
->sk_family
) &&
4452 inet_v6_ipv6only(sk
) &&
4453 (AF_INET
== addr
->a
.sa
.sa_family
))
4455 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4456 if (!temp
.v4
.sin_port
)
4457 temp
.v4
.sin_port
= htons(port
);
4459 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4461 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4462 memcpy(to
, &temp
, addrlen
);
4465 *bytes_copied
+= addrlen
;
4467 if (cnt
>= max_addrs
) break;
4474 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4475 size_t space_left
, int *bytes_copied
)
4477 struct sctp_sockaddr_entry
*addr
;
4478 union sctp_addr temp
;
4483 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
4487 if ((PF_INET
== sk
->sk_family
) &&
4488 (AF_INET6
== addr
->a
.sa
.sa_family
))
4490 if ((PF_INET6
== sk
->sk_family
) &&
4491 inet_v6_ipv6only(sk
) &&
4492 (AF_INET
== addr
->a
.sa
.sa_family
))
4494 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4495 if (!temp
.v4
.sin_port
)
4496 temp
.v4
.sin_port
= htons(port
);
4498 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4500 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4501 if (space_left
< addrlen
) {
4505 memcpy(to
, &temp
, addrlen
);
4509 space_left
-= addrlen
;
4510 *bytes_copied
+= addrlen
;
4517 /* Old API for getting list of local addresses. Does not work for 32-bit
4518 * programs running on a 64-bit kernel
4520 static int sctp_getsockopt_local_addrs_old(struct sock
*sk
, int len
,
4521 char __user
*optval
, int __user
*optlen
)
4523 struct sctp_bind_addr
*bp
;
4524 struct sctp_association
*asoc
;
4526 struct sctp_getaddrs_old getaddrs
;
4527 struct sctp_sockaddr_entry
*addr
;
4529 union sctp_addr temp
;
4530 struct sctp_sock
*sp
= sctp_sk(sk
);
4535 int bytes_copied
= 0;
4537 if (len
< sizeof(struct sctp_getaddrs_old
))
4540 len
= sizeof(struct sctp_getaddrs_old
);
4541 if (copy_from_user(&getaddrs
, optval
, len
))
4544 if (getaddrs
.addr_num
<= 0 ||
4545 getaddrs
.addr_num
>= (INT_MAX
/ sizeof(union sctp_addr
)))
4548 printk(KERN_WARNING
"SCTP: Use of SCTP_GET_LOCAL_ADDRS_OLD "
4549 "socket option deprecated\n");
4552 * For UDP-style sockets, id specifies the association to query.
4553 * If the id field is set to the value '0' then the locally bound
4554 * addresses are returned without regard to any particular
4557 if (0 == getaddrs
.assoc_id
) {
4558 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4560 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4563 bp
= &asoc
->base
.bind_addr
;
4566 to
= getaddrs
.addrs
;
4568 /* Allocate space for a local instance of packed array to hold all
4569 * the data. We store addresses here first and then put write them
4570 * to the user in one shot.
4572 addrs
= kmalloc(sizeof(union sctp_addr
) * getaddrs
.addr_num
,
4577 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4578 * addresses from the global local address list.
4580 if (sctp_list_single_entry(&bp
->address_list
)) {
4581 addr
= list_entry(bp
->address_list
.next
,
4582 struct sctp_sockaddr_entry
, list
);
4583 if (sctp_is_any(&addr
->a
)) {
4584 cnt
= sctp_copy_laddrs_old(sk
, bp
->port
,
4586 addrs
, &bytes_copied
);
4592 /* Protection on the bound address list is not needed since
4593 * in the socket option context we hold a socket lock and
4594 * thus the bound address list can't change.
4596 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4597 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4598 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4599 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4600 memcpy(buf
, &temp
, addrlen
);
4602 bytes_copied
+= addrlen
;
4604 if (cnt
>= getaddrs
.addr_num
) break;
4608 /* copy the entire address list into the user provided space */
4609 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4614 /* copy the leading structure back to user */
4615 getaddrs
.addr_num
= cnt
;
4616 if (copy_to_user(optval
, &getaddrs
, len
))
4624 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4625 char __user
*optval
, int __user
*optlen
)
4627 struct sctp_bind_addr
*bp
;
4628 struct sctp_association
*asoc
;
4630 struct sctp_getaddrs getaddrs
;
4631 struct sctp_sockaddr_entry
*addr
;
4633 union sctp_addr temp
;
4634 struct sctp_sock
*sp
= sctp_sk(sk
);
4638 int bytes_copied
= 0;
4642 if (len
< sizeof(struct sctp_getaddrs
))
4645 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4649 * For UDP-style sockets, id specifies the association to query.
4650 * If the id field is set to the value '0' then the locally bound
4651 * addresses are returned without regard to any particular
4654 if (0 == getaddrs
.assoc_id
) {
4655 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4657 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4660 bp
= &asoc
->base
.bind_addr
;
4663 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4664 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4666 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4670 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4671 * addresses from the global local address list.
4673 if (sctp_list_single_entry(&bp
->address_list
)) {
4674 addr
= list_entry(bp
->address_list
.next
,
4675 struct sctp_sockaddr_entry
, list
);
4676 if (sctp_is_any(&addr
->a
)) {
4677 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4678 space_left
, &bytes_copied
);
4688 /* Protection on the bound address list is not needed since
4689 * in the socket option context we hold a socket lock and
4690 * thus the bound address list can't change.
4692 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4693 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4694 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4695 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4696 if (space_left
< addrlen
) {
4697 err
= -ENOMEM
; /*fixme: right error?*/
4700 memcpy(buf
, &temp
, addrlen
);
4702 bytes_copied
+= addrlen
;
4704 space_left
-= addrlen
;
4708 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4712 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4716 if (put_user(bytes_copied
, optlen
))
4723 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4725 * Requests that the local SCTP stack use the enclosed peer address as
4726 * the association primary. The enclosed address must be one of the
4727 * association peer's addresses.
4729 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4730 char __user
*optval
, int __user
*optlen
)
4732 struct sctp_prim prim
;
4733 struct sctp_association
*asoc
;
4734 struct sctp_sock
*sp
= sctp_sk(sk
);
4736 if (len
< sizeof(struct sctp_prim
))
4739 len
= sizeof(struct sctp_prim
);
4741 if (copy_from_user(&prim
, optval
, len
))
4744 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4748 if (!asoc
->peer
.primary_path
)
4751 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4752 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4754 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4755 (union sctp_addr
*)&prim
.ssp_addr
);
4757 if (put_user(len
, optlen
))
4759 if (copy_to_user(optval
, &prim
, len
))
4766 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4768 * Requests that the local endpoint set the specified Adaptation Layer
4769 * Indication parameter for all future INIT and INIT-ACK exchanges.
4771 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4772 char __user
*optval
, int __user
*optlen
)
4774 struct sctp_setadaptation adaptation
;
4776 if (len
< sizeof(struct sctp_setadaptation
))
4779 len
= sizeof(struct sctp_setadaptation
);
4781 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4783 if (put_user(len
, optlen
))
4785 if (copy_to_user(optval
, &adaptation
, len
))
4793 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4795 * Applications that wish to use the sendto() system call may wish to
4796 * specify a default set of parameters that would normally be supplied
4797 * through the inclusion of ancillary data. This socket option allows
4798 * such an application to set the default sctp_sndrcvinfo structure.
4801 * The application that wishes to use this socket option simply passes
4802 * in to this call the sctp_sndrcvinfo structure defined in Section
4803 * 5.2.2) The input parameters accepted by this call include
4804 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4805 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4806 * to this call if the caller is using the UDP model.
4808 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4810 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4811 int len
, char __user
*optval
,
4814 struct sctp_sndrcvinfo info
;
4815 struct sctp_association
*asoc
;
4816 struct sctp_sock
*sp
= sctp_sk(sk
);
4818 if (len
< sizeof(struct sctp_sndrcvinfo
))
4821 len
= sizeof(struct sctp_sndrcvinfo
);
4823 if (copy_from_user(&info
, optval
, len
))
4826 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4827 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4831 info
.sinfo_stream
= asoc
->default_stream
;
4832 info
.sinfo_flags
= asoc
->default_flags
;
4833 info
.sinfo_ppid
= asoc
->default_ppid
;
4834 info
.sinfo_context
= asoc
->default_context
;
4835 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4837 info
.sinfo_stream
= sp
->default_stream
;
4838 info
.sinfo_flags
= sp
->default_flags
;
4839 info
.sinfo_ppid
= sp
->default_ppid
;
4840 info
.sinfo_context
= sp
->default_context
;
4841 info
.sinfo_timetolive
= sp
->default_timetolive
;
4844 if (put_user(len
, optlen
))
4846 if (copy_to_user(optval
, &info
, len
))
4854 * 7.1.5 SCTP_NODELAY
4856 * Turn on/off any Nagle-like algorithm. This means that packets are
4857 * generally sent as soon as possible and no unnecessary delays are
4858 * introduced, at the cost of more packets in the network. Expects an
4859 * integer boolean flag.
4862 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4863 char __user
*optval
, int __user
*optlen
)
4867 if (len
< sizeof(int))
4871 val
= (sctp_sk(sk
)->nodelay
== 1);
4872 if (put_user(len
, optlen
))
4874 if (copy_to_user(optval
, &val
, len
))
4881 * 7.1.1 SCTP_RTOINFO
4883 * The protocol parameters used to initialize and bound retransmission
4884 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4885 * and modify these parameters.
4886 * All parameters are time values, in milliseconds. A value of 0, when
4887 * modifying the parameters, indicates that the current value should not
4891 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4892 char __user
*optval
,
4893 int __user
*optlen
) {
4894 struct sctp_rtoinfo rtoinfo
;
4895 struct sctp_association
*asoc
;
4897 if (len
< sizeof (struct sctp_rtoinfo
))
4900 len
= sizeof(struct sctp_rtoinfo
);
4902 if (copy_from_user(&rtoinfo
, optval
, len
))
4905 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4907 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4910 /* Values corresponding to the specific association. */
4912 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4913 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4914 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4916 /* Values corresponding to the endpoint. */
4917 struct sctp_sock
*sp
= sctp_sk(sk
);
4919 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4920 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4921 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4924 if (put_user(len
, optlen
))
4927 if (copy_to_user(optval
, &rtoinfo
, len
))
4935 * 7.1.2 SCTP_ASSOCINFO
4937 * This option is used to tune the maximum retransmission attempts
4938 * of the association.
4939 * Returns an error if the new association retransmission value is
4940 * greater than the sum of the retransmission value of the peer.
4941 * See [SCTP] for more information.
4944 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4945 char __user
*optval
,
4949 struct sctp_assocparams assocparams
;
4950 struct sctp_association
*asoc
;
4951 struct list_head
*pos
;
4954 if (len
< sizeof (struct sctp_assocparams
))
4957 len
= sizeof(struct sctp_assocparams
);
4959 if (copy_from_user(&assocparams
, optval
, len
))
4962 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4964 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4967 /* Values correspoinding to the specific association */
4969 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4970 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4971 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4972 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4974 (asoc
->cookie_life
.tv_usec
4977 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4981 assocparams
.sasoc_number_peer_destinations
= cnt
;
4983 /* Values corresponding to the endpoint */
4984 struct sctp_sock
*sp
= sctp_sk(sk
);
4986 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4987 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4988 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4989 assocparams
.sasoc_cookie_life
=
4990 sp
->assocparams
.sasoc_cookie_life
;
4991 assocparams
.sasoc_number_peer_destinations
=
4993 sasoc_number_peer_destinations
;
4996 if (put_user(len
, optlen
))
4999 if (copy_to_user(optval
, &assocparams
, len
))
5006 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5008 * This socket option is a boolean flag which turns on or off mapped V4
5009 * addresses. If this option is turned on and the socket is type
5010 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5011 * If this option is turned off, then no mapping will be done of V4
5012 * addresses and a user will receive both PF_INET6 and PF_INET type
5013 * addresses on the socket.
5015 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
5016 char __user
*optval
, int __user
*optlen
)
5019 struct sctp_sock
*sp
= sctp_sk(sk
);
5021 if (len
< sizeof(int))
5026 if (put_user(len
, optlen
))
5028 if (copy_to_user(optval
, &val
, len
))
5035 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5036 * (chapter and verse is quoted at sctp_setsockopt_context())
5038 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
5039 char __user
*optval
, int __user
*optlen
)
5041 struct sctp_assoc_value params
;
5042 struct sctp_sock
*sp
;
5043 struct sctp_association
*asoc
;
5045 if (len
< sizeof(struct sctp_assoc_value
))
5048 len
= sizeof(struct sctp_assoc_value
);
5050 if (copy_from_user(¶ms
, optval
, len
))
5055 if (params
.assoc_id
!= 0) {
5056 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5059 params
.assoc_value
= asoc
->default_rcv_context
;
5061 params
.assoc_value
= sp
->default_rcv_context
;
5064 if (put_user(len
, optlen
))
5066 if (copy_to_user(optval
, ¶ms
, len
))
5073 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
5075 * This socket option specifies the maximum size to put in any outgoing
5076 * SCTP chunk. If a message is larger than this size it will be
5077 * fragmented by SCTP into the specified size. Note that the underlying
5078 * SCTP implementation may fragment into smaller sized chunks when the
5079 * PMTU of the underlying association is smaller than the value set by
5082 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
5083 char __user
*optval
, int __user
*optlen
)
5087 if (len
< sizeof(int))
5092 val
= sctp_sk(sk
)->user_frag
;
5093 if (put_user(len
, optlen
))
5095 if (copy_to_user(optval
, &val
, len
))
5102 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5103 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5105 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
5106 char __user
*optval
, int __user
*optlen
)
5110 if (len
< sizeof(int))
5115 val
= sctp_sk(sk
)->frag_interleave
;
5116 if (put_user(len
, optlen
))
5118 if (copy_to_user(optval
, &val
, len
))
5125 * 7.1.25. Set or Get the sctp partial delivery point
5126 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5128 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
5129 char __user
*optval
,
5134 if (len
< sizeof(u32
))
5139 val
= sctp_sk(sk
)->pd_point
;
5140 if (put_user(len
, optlen
))
5142 if (copy_to_user(optval
, &val
, len
))
5149 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5150 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5152 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5153 char __user
*optval
,
5156 struct sctp_assoc_value params
;
5157 struct sctp_sock
*sp
;
5158 struct sctp_association
*asoc
;
5160 if (len
< sizeof(int))
5163 if (len
== sizeof(int)) {
5165 "SCTP: Use of int in max_burst socket option deprecated\n");
5167 "SCTP: Use struct sctp_assoc_value instead\n");
5168 params
.assoc_id
= 0;
5169 } else if (len
== sizeof (struct sctp_assoc_value
)) {
5170 if (copy_from_user(¶ms
, optval
, len
))
5177 if (params
.assoc_id
!= 0) {
5178 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5181 params
.assoc_value
= asoc
->max_burst
;
5183 params
.assoc_value
= sp
->max_burst
;
5185 if (len
== sizeof(int)) {
5186 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5189 if (copy_to_user(optval
, ¶ms
, len
))
5197 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5198 char __user
*optval
, int __user
*optlen
)
5200 struct sctp_hmac_algo_param
*hmacs
;
5203 hmacs
= sctp_sk(sk
)->ep
->auth_hmacs_list
;
5204 param_len
= ntohs(hmacs
->param_hdr
.length
);
5206 if (len
< param_len
)
5208 if (put_user(len
, optlen
))
5210 if (copy_to_user(optval
, hmacs
->hmac_ids
, len
))
5216 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5217 char __user
*optval
, int __user
*optlen
)
5219 struct sctp_authkeyid val
;
5220 struct sctp_association
*asoc
;
5222 if (len
< sizeof(struct sctp_authkeyid
))
5224 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5227 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5228 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5232 val
.scact_keynumber
= asoc
->active_key_id
;
5234 val
.scact_keynumber
= sctp_sk(sk
)->ep
->active_key_id
;
5239 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5240 char __user
*optval
, int __user
*optlen
)
5242 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5243 struct sctp_authchunks val
;
5244 struct sctp_association
*asoc
;
5245 struct sctp_chunks_param
*ch
;
5249 if (len
<= sizeof(struct sctp_authchunks
))
5252 if (copy_from_user(&val
, p
, sizeof(struct sctp_authchunks
)))
5255 to
= p
->gauth_chunks
;
5256 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5260 ch
= asoc
->peer
.peer_chunks
;
5262 /* See if the user provided enough room for all the data */
5263 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5264 if (len
< num_chunks
)
5268 if (put_user(len
, optlen
))
5270 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5272 if (copy_to_user(to
, ch
->chunks
, len
))
5278 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
5279 char __user
*optval
, int __user
*optlen
)
5281 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5282 struct sctp_authchunks val
;
5283 struct sctp_association
*asoc
;
5284 struct sctp_chunks_param
*ch
;
5288 if (len
<= sizeof(struct sctp_authchunks
))
5291 if (copy_from_user(&val
, p
, sizeof(struct sctp_authchunks
)))
5294 to
= p
->gauth_chunks
;
5295 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5296 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
5300 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
5302 ch
= sctp_sk(sk
)->ep
->auth_chunk_list
;
5304 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5305 if (len
< num_chunks
)
5309 if (put_user(len
, optlen
))
5311 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5313 if (copy_to_user(to
, ch
->chunks
, len
))
5319 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
5320 char __user
*optval
, int __user
*optlen
)
5325 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5328 /* I can hardly begin to describe how wrong this is. This is
5329 * so broken as to be worse than useless. The API draft
5330 * REALLY is NOT helpful here... I am not convinced that the
5331 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5332 * are at all well-founded.
5334 if (level
!= SOL_SCTP
) {
5335 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5337 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
5341 if (get_user(len
, optlen
))
5348 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
5350 case SCTP_DISABLE_FRAGMENTS
:
5351 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
5355 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
5357 case SCTP_AUTOCLOSE
:
5358 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
5360 case SCTP_SOCKOPT_PEELOFF
:
5361 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
5363 case SCTP_PEER_ADDR_PARAMS
:
5364 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
5367 case SCTP_DELAYED_ACK
:
5368 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
5372 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
5374 case SCTP_GET_PEER_ADDRS_NUM_OLD
:
5375 retval
= sctp_getsockopt_peer_addrs_num_old(sk
, len
, optval
,
5378 case SCTP_GET_LOCAL_ADDRS_NUM_OLD
:
5379 retval
= sctp_getsockopt_local_addrs_num_old(sk
, len
, optval
,
5382 case SCTP_GET_PEER_ADDRS_OLD
:
5383 retval
= sctp_getsockopt_peer_addrs_old(sk
, len
, optval
,
5386 case SCTP_GET_LOCAL_ADDRS_OLD
:
5387 retval
= sctp_getsockopt_local_addrs_old(sk
, len
, optval
,
5390 case SCTP_GET_PEER_ADDRS
:
5391 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
5394 case SCTP_GET_LOCAL_ADDRS
:
5395 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
5398 case SCTP_DEFAULT_SEND_PARAM
:
5399 retval
= sctp_getsockopt_default_send_param(sk
, len
,
5402 case SCTP_PRIMARY_ADDR
:
5403 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
5406 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
5409 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
5411 case SCTP_ASSOCINFO
:
5412 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
5414 case SCTP_I_WANT_MAPPED_V4_ADDR
:
5415 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
5418 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
5420 case SCTP_GET_PEER_ADDR_INFO
:
5421 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
5424 case SCTP_ADAPTATION_LAYER
:
5425 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
5429 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
5431 case SCTP_FRAGMENT_INTERLEAVE
:
5432 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
5435 case SCTP_PARTIAL_DELIVERY_POINT
:
5436 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
5439 case SCTP_MAX_BURST
:
5440 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
5443 case SCTP_AUTH_CHUNK
:
5444 case SCTP_AUTH_DELETE_KEY
:
5445 retval
= -EOPNOTSUPP
;
5447 case SCTP_HMAC_IDENT
:
5448 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
5450 case SCTP_AUTH_ACTIVE_KEY
:
5451 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
5453 case SCTP_PEER_AUTH_CHUNKS
:
5454 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
5457 case SCTP_LOCAL_AUTH_CHUNKS
:
5458 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
5462 retval
= -ENOPROTOOPT
;
5466 sctp_release_sock(sk
);
5470 static void sctp_hash(struct sock
*sk
)
5475 static void sctp_unhash(struct sock
*sk
)
5480 /* Check if port is acceptable. Possibly find first available port.
5482 * The port hash table (contained in the 'global' SCTP protocol storage
5483 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5484 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5485 * list (the list number is the port number hashed out, so as you
5486 * would expect from a hash function, all the ports in a given list have
5487 * such a number that hashes out to the same list number; you were
5488 * expecting that, right?); so each list has a set of ports, with a
5489 * link to the socket (struct sock) that uses it, the port number and
5490 * a fastreuse flag (FIXME: NPI ipg).
5492 static struct sctp_bind_bucket
*sctp_bucket_create(
5493 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
5495 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
5497 struct sctp_bind_hashbucket
*head
; /* hash list */
5498 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5499 struct hlist_node
*node
;
5500 unsigned short snum
;
5503 snum
= ntohs(addr
->v4
.sin_port
);
5505 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
5506 sctp_local_bh_disable();
5509 /* Search for an available port. */
5510 int low
, high
, remaining
, index
;
5513 inet_get_local_port_range(&low
, &high
);
5514 remaining
= (high
- low
) + 1;
5515 rover
= net_random() % remaining
+ low
;
5519 if ((rover
< low
) || (rover
> high
))
5521 index
= sctp_phashfn(rover
);
5522 head
= &sctp_port_hashtable
[index
];
5523 sctp_spin_lock(&head
->lock
);
5524 sctp_for_each_hentry(pp
, node
, &head
->chain
)
5525 if (pp
->port
== rover
)
5529 sctp_spin_unlock(&head
->lock
);
5530 } while (--remaining
> 0);
5532 /* Exhausted local port range during search? */
5537 /* OK, here is the one we will use. HEAD (the port
5538 * hash table list entry) is non-NULL and we hold it's
5543 /* We are given an specific port number; we verify
5544 * that it is not being used. If it is used, we will
5545 * exahust the search in the hash list corresponding
5546 * to the port number (snum) - we detect that with the
5547 * port iterator, pp being NULL.
5549 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
5550 sctp_spin_lock(&head
->lock
);
5551 sctp_for_each_hentry(pp
, node
, &head
->chain
) {
5552 if (pp
->port
== snum
)
5559 if (!hlist_empty(&pp
->owner
)) {
5560 /* We had a port hash table hit - there is an
5561 * available port (pp != NULL) and it is being
5562 * used by other socket (pp->owner not empty); that other
5563 * socket is going to be sk2.
5565 int reuse
= sk
->sk_reuse
;
5567 struct hlist_node
*node
;
5569 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5570 if (pp
->fastreuse
&& sk
->sk_reuse
&&
5571 sk
->sk_state
!= SCTP_SS_LISTENING
)
5574 /* Run through the list of sockets bound to the port
5575 * (pp->port) [via the pointers bind_next and
5576 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5577 * we get the endpoint they describe and run through
5578 * the endpoint's list of IP (v4 or v6) addresses,
5579 * comparing each of the addresses with the address of
5580 * the socket sk. If we find a match, then that means
5581 * that this port/socket (sk) combination are already
5584 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
5585 struct sctp_endpoint
*ep2
;
5586 ep2
= sctp_sk(sk2
)->ep
;
5589 (reuse
&& sk2
->sk_reuse
&&
5590 sk2
->sk_state
!= SCTP_SS_LISTENING
))
5593 if (sctp_bind_addr_conflict(&ep2
->base
.bind_addr
, addr
,
5594 sctp_sk(sk2
), sctp_sk(sk
))) {
5599 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5602 /* If there was a hash table miss, create a new port. */
5604 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
5607 /* In either case (hit or miss), make sure fastreuse is 1 only
5608 * if sk->sk_reuse is too (that is, if the caller requested
5609 * SO_REUSEADDR on this socket -sk-).
5611 if (hlist_empty(&pp
->owner
)) {
5612 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
5616 } else if (pp
->fastreuse
&&
5617 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
5620 /* We are set, so fill up all the data in the hash table
5621 * entry, tie the socket list information with the rest of the
5622 * sockets FIXME: Blurry, NPI (ipg).
5625 if (!sctp_sk(sk
)->bind_hash
) {
5626 inet_sk(sk
)->num
= snum
;
5627 sk_add_bind_node(sk
, &pp
->owner
);
5628 sctp_sk(sk
)->bind_hash
= pp
;
5633 sctp_spin_unlock(&head
->lock
);
5636 sctp_local_bh_enable();
5640 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5641 * port is requested.
5643 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
5646 union sctp_addr addr
;
5647 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5649 /* Set up a dummy address struct from the sk. */
5650 af
->from_sk(&addr
, sk
);
5651 addr
.v4
.sin_port
= htons(snum
);
5653 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5654 ret
= sctp_get_port_local(sk
, &addr
);
5656 return (ret
? 1 : 0);
5660 * 3.1.3 listen() - UDP Style Syntax
5662 * By default, new associations are not accepted for UDP style sockets.
5663 * An application uses listen() to mark a socket as being able to
5664 * accept new associations.
5666 SCTP_STATIC
int sctp_seqpacket_listen(struct sock
*sk
, int backlog
)
5668 struct sctp_sock
*sp
= sctp_sk(sk
);
5669 struct sctp_endpoint
*ep
= sp
->ep
;
5671 /* Only UDP style sockets that are not peeled off are allowed to
5674 if (!sctp_style(sk
, UDP
))
5677 /* If backlog is zero, disable listening. */
5679 if (sctp_sstate(sk
, CLOSED
))
5682 sctp_unhash_endpoint(ep
);
5683 sk
->sk_state
= SCTP_SS_CLOSED
;
5687 /* Return if we are already listening. */
5688 if (sctp_sstate(sk
, LISTENING
))
5692 * If a bind() or sctp_bindx() is not called prior to a listen()
5693 * call that allows new associations to be accepted, the system
5694 * picks an ephemeral port and will choose an address set equivalent
5695 * to binding with a wildcard address.
5697 * This is not currently spelled out in the SCTP sockets
5698 * extensions draft, but follows the practice as seen in TCP
5701 * Additionally, turn off fastreuse flag since we are not listening
5703 sk
->sk_state
= SCTP_SS_LISTENING
;
5704 if (!ep
->base
.bind_addr
.port
) {
5705 if (sctp_autobind(sk
))
5708 if (sctp_get_port(sk
, inet_sk(sk
)->num
)) {
5709 sk
->sk_state
= SCTP_SS_CLOSED
;
5712 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5715 sctp_hash_endpoint(ep
);
5720 * 4.1.3 listen() - TCP Style Syntax
5722 * Applications uses listen() to ready the SCTP endpoint for accepting
5723 * inbound associations.
5725 SCTP_STATIC
int sctp_stream_listen(struct sock
*sk
, int backlog
)
5727 struct sctp_sock
*sp
= sctp_sk(sk
);
5728 struct sctp_endpoint
*ep
= sp
->ep
;
5730 /* If backlog is zero, disable listening. */
5732 if (sctp_sstate(sk
, CLOSED
))
5735 sctp_unhash_endpoint(ep
);
5736 sk
->sk_state
= SCTP_SS_CLOSED
;
5740 if (sctp_sstate(sk
, LISTENING
))
5744 * If a bind() or sctp_bindx() is not called prior to a listen()
5745 * call that allows new associations to be accepted, the system
5746 * picks an ephemeral port and will choose an address set equivalent
5747 * to binding with a wildcard address.
5749 * This is not currently spelled out in the SCTP sockets
5750 * extensions draft, but follows the practice as seen in TCP
5753 sk
->sk_state
= SCTP_SS_LISTENING
;
5754 if (!ep
->base
.bind_addr
.port
) {
5755 if (sctp_autobind(sk
))
5758 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5760 sk
->sk_max_ack_backlog
= backlog
;
5761 sctp_hash_endpoint(ep
);
5766 * Move a socket to LISTENING state.
5768 int sctp_inet_listen(struct socket
*sock
, int backlog
)
5770 struct sock
*sk
= sock
->sk
;
5771 struct crypto_hash
*tfm
= NULL
;
5774 if (unlikely(backlog
< 0))
5779 if (sock
->state
!= SS_UNCONNECTED
)
5782 /* Allocate HMAC for generating cookie. */
5783 if (!sctp_sk(sk
)->hmac
&& sctp_hmac_alg
) {
5784 tfm
= crypto_alloc_hash(sctp_hmac_alg
, 0, CRYPTO_ALG_ASYNC
);
5786 if (net_ratelimit()) {
5788 "SCTP: failed to load transform for %s: %ld\n",
5789 sctp_hmac_alg
, PTR_ERR(tfm
));
5796 switch (sock
->type
) {
5797 case SOCK_SEQPACKET
:
5798 err
= sctp_seqpacket_listen(sk
, backlog
);
5801 err
= sctp_stream_listen(sk
, backlog
);
5810 /* Store away the transform reference. */
5811 if (!sctp_sk(sk
)->hmac
)
5812 sctp_sk(sk
)->hmac
= tfm
;
5814 sctp_release_sock(sk
);
5817 crypto_free_hash(tfm
);
5822 * This function is done by modeling the current datagram_poll() and the
5823 * tcp_poll(). Note that, based on these implementations, we don't
5824 * lock the socket in this function, even though it seems that,
5825 * ideally, locking or some other mechanisms can be used to ensure
5826 * the integrity of the counters (sndbuf and wmem_alloc) used
5827 * in this place. We assume that we don't need locks either until proven
5830 * Another thing to note is that we include the Async I/O support
5831 * here, again, by modeling the current TCP/UDP code. We don't have
5832 * a good way to test with it yet.
5834 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
5836 struct sock
*sk
= sock
->sk
;
5837 struct sctp_sock
*sp
= sctp_sk(sk
);
5840 poll_wait(file
, sk
->sk_sleep
, wait
);
5842 /* A TCP-style listening socket becomes readable when the accept queue
5845 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
5846 return (!list_empty(&sp
->ep
->asocs
)) ?
5847 (POLLIN
| POLLRDNORM
) : 0;
5851 /* Is there any exceptional events? */
5852 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
5854 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5856 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
5859 /* Is it readable? Reconsider this code with TCP-style support. */
5860 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
5861 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
5862 mask
|= POLLIN
| POLLRDNORM
;
5864 /* The association is either gone or not ready. */
5865 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
5868 /* Is it writable? */
5869 if (sctp_writeable(sk
)) {
5870 mask
|= POLLOUT
| POLLWRNORM
;
5872 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
5874 * Since the socket is not locked, the buffer
5875 * might be made available after the writeable check and
5876 * before the bit is set. This could cause a lost I/O
5877 * signal. tcp_poll() has a race breaker for this race
5878 * condition. Based on their implementation, we put
5879 * in the following code to cover it as well.
5881 if (sctp_writeable(sk
))
5882 mask
|= POLLOUT
| POLLWRNORM
;
5887 /********************************************************************
5888 * 2nd Level Abstractions
5889 ********************************************************************/
5891 static struct sctp_bind_bucket
*sctp_bucket_create(
5892 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
5894 struct sctp_bind_bucket
*pp
;
5896 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
5898 SCTP_DBG_OBJCNT_INC(bind_bucket
);
5901 INIT_HLIST_HEAD(&pp
->owner
);
5902 hlist_add_head(&pp
->node
, &head
->chain
);
5907 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5908 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
5910 if (pp
&& hlist_empty(&pp
->owner
)) {
5911 __hlist_del(&pp
->node
);
5912 kmem_cache_free(sctp_bucket_cachep
, pp
);
5913 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
5917 /* Release this socket's reference to a local port. */
5918 static inline void __sctp_put_port(struct sock
*sk
)
5920 struct sctp_bind_hashbucket
*head
=
5921 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->num
)];
5922 struct sctp_bind_bucket
*pp
;
5924 sctp_spin_lock(&head
->lock
);
5925 pp
= sctp_sk(sk
)->bind_hash
;
5926 __sk_del_bind_node(sk
);
5927 sctp_sk(sk
)->bind_hash
= NULL
;
5928 inet_sk(sk
)->num
= 0;
5929 sctp_bucket_destroy(pp
);
5930 sctp_spin_unlock(&head
->lock
);
5933 void sctp_put_port(struct sock
*sk
)
5935 sctp_local_bh_disable();
5936 __sctp_put_port(sk
);
5937 sctp_local_bh_enable();
5941 * The system picks an ephemeral port and choose an address set equivalent
5942 * to binding with a wildcard address.
5943 * One of those addresses will be the primary address for the association.
5944 * This automatically enables the multihoming capability of SCTP.
5946 static int sctp_autobind(struct sock
*sk
)
5948 union sctp_addr autoaddr
;
5952 /* Initialize a local sockaddr structure to INADDR_ANY. */
5953 af
= sctp_sk(sk
)->pf
->af
;
5955 port
= htons(inet_sk(sk
)->num
);
5956 af
->inaddr_any(&autoaddr
, port
);
5958 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5961 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5964 * 4.2 The cmsghdr Structure *
5966 * When ancillary data is sent or received, any number of ancillary data
5967 * objects can be specified by the msg_control and msg_controllen members of
5968 * the msghdr structure, because each object is preceded by
5969 * a cmsghdr structure defining the object's length (the cmsg_len member).
5970 * Historically Berkeley-derived implementations have passed only one object
5971 * at a time, but this API allows multiple objects to be
5972 * passed in a single call to sendmsg() or recvmsg(). The following example
5973 * shows two ancillary data objects in a control buffer.
5975 * |<--------------------------- msg_controllen -------------------------->|
5978 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5980 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5983 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5985 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5988 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5989 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5991 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5993 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6000 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
6001 sctp_cmsgs_t
*cmsgs
)
6003 struct cmsghdr
*cmsg
;
6004 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
6006 for (cmsg
= CMSG_FIRSTHDR(msg
);
6008 cmsg
= CMSG_NXTHDR(my_msg
, cmsg
)) {
6009 if (!CMSG_OK(my_msg
, cmsg
))
6012 /* Should we parse this header or ignore? */
6013 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
6016 /* Strictly check lengths following example in SCM code. */
6017 switch (cmsg
->cmsg_type
) {
6019 /* SCTP Socket API Extension
6020 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
6022 * This cmsghdr structure provides information for
6023 * initializing new SCTP associations with sendmsg().
6024 * The SCTP_INITMSG socket option uses this same data
6025 * structure. This structure is not used for
6028 * cmsg_level cmsg_type cmsg_data[]
6029 * ------------ ------------ ----------------------
6030 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6032 if (cmsg
->cmsg_len
!=
6033 CMSG_LEN(sizeof(struct sctp_initmsg
)))
6035 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
6039 /* SCTP Socket API Extension
6040 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6042 * This cmsghdr structure specifies SCTP options for
6043 * sendmsg() and describes SCTP header information
6044 * about a received message through recvmsg().
6046 * cmsg_level cmsg_type cmsg_data[]
6047 * ------------ ------------ ----------------------
6048 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6050 if (cmsg
->cmsg_len
!=
6051 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
6055 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
6057 /* Minimally, validate the sinfo_flags. */
6058 if (cmsgs
->info
->sinfo_flags
&
6059 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
6060 SCTP_ABORT
| SCTP_EOF
))
6072 * Wait for a packet..
6073 * Note: This function is the same function as in core/datagram.c
6074 * with a few modifications to make lksctp work.
6076 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
6081 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
6083 /* Socket errors? */
6084 error
= sock_error(sk
);
6088 if (!skb_queue_empty(&sk
->sk_receive_queue
))
6091 /* Socket shut down? */
6092 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6095 /* Sequenced packets can come disconnected. If so we report the
6100 /* Is there a good reason to think that we may receive some data? */
6101 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
6104 /* Handle signals. */
6105 if (signal_pending(current
))
6108 /* Let another process have a go. Since we are going to sleep
6109 * anyway. Note: This may cause odd behaviors if the message
6110 * does not fit in the user's buffer, but this seems to be the
6111 * only way to honor MSG_DONTWAIT realistically.
6113 sctp_release_sock(sk
);
6114 *timeo_p
= schedule_timeout(*timeo_p
);
6118 finish_wait(sk
->sk_sleep
, &wait
);
6122 error
= sock_intr_errno(*timeo_p
);
6125 finish_wait(sk
->sk_sleep
, &wait
);
6130 /* Receive a datagram.
6131 * Note: This is pretty much the same routine as in core/datagram.c
6132 * with a few changes to make lksctp work.
6134 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
6135 int noblock
, int *err
)
6138 struct sk_buff
*skb
;
6141 timeo
= sock_rcvtimeo(sk
, noblock
);
6143 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6144 timeo
, MAX_SCHEDULE_TIMEOUT
);
6147 /* Again only user level code calls this function,
6148 * so nothing interrupt level
6149 * will suddenly eat the receive_queue.
6151 * Look at current nfs client by the way...
6152 * However, this function was corrent in any case. 8)
6154 if (flags
& MSG_PEEK
) {
6155 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
6156 skb
= skb_peek(&sk
->sk_receive_queue
);
6158 atomic_inc(&skb
->users
);
6159 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
6161 skb
= skb_dequeue(&sk
->sk_receive_queue
);
6167 /* Caller is allowed not to check sk->sk_err before calling. */
6168 error
= sock_error(sk
);
6172 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6175 /* User doesn't want to wait. */
6179 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
6188 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6189 static void __sctp_write_space(struct sctp_association
*asoc
)
6191 struct sock
*sk
= asoc
->base
.sk
;
6192 struct socket
*sock
= sk
->sk_socket
;
6194 if ((sctp_wspace(asoc
) > 0) && sock
) {
6195 if (waitqueue_active(&asoc
->wait
))
6196 wake_up_interruptible(&asoc
->wait
);
6198 if (sctp_writeable(sk
)) {
6199 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
6200 wake_up_interruptible(sk
->sk_sleep
);
6202 /* Note that we try to include the Async I/O support
6203 * here by modeling from the current TCP/UDP code.
6204 * We have not tested with it yet.
6206 if (sock
->fasync_list
&&
6207 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
6208 sock_wake_async(sock
,
6209 SOCK_WAKE_SPACE
, POLL_OUT
);
6214 /* Do accounting for the sndbuf space.
6215 * Decrement the used sndbuf space of the corresponding association by the
6216 * data size which was just transmitted(freed).
6218 static void sctp_wfree(struct sk_buff
*skb
)
6220 struct sctp_association
*asoc
;
6221 struct sctp_chunk
*chunk
;
6224 /* Get the saved chunk pointer. */
6225 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
6228 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
6229 sizeof(struct sk_buff
) +
6230 sizeof(struct sctp_chunk
);
6232 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
6235 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6237 sk
->sk_wmem_queued
-= skb
->truesize
;
6238 sk_mem_uncharge(sk
, skb
->truesize
);
6241 __sctp_write_space(asoc
);
6243 sctp_association_put(asoc
);
6246 /* Do accounting for the receive space on the socket.
6247 * Accounting for the association is done in ulpevent.c
6248 * We set this as a destructor for the cloned data skbs so that
6249 * accounting is done at the correct time.
6251 void sctp_sock_rfree(struct sk_buff
*skb
)
6253 struct sock
*sk
= skb
->sk
;
6254 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
6256 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
6259 * Mimic the behavior of sock_rfree
6261 sk_mem_uncharge(sk
, event
->rmem_len
);
6265 /* Helper function to wait for space in the sndbuf. */
6266 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
6269 struct sock
*sk
= asoc
->base
.sk
;
6271 long current_timeo
= *timeo_p
;
6274 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6275 asoc
, (long)(*timeo_p
), msg_len
);
6277 /* Increment the association's refcnt. */
6278 sctp_association_hold(asoc
);
6280 /* Wait on the association specific sndbuf space. */
6282 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6283 TASK_INTERRUPTIBLE
);
6286 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6289 if (signal_pending(current
))
6290 goto do_interrupted
;
6291 if (msg_len
<= sctp_wspace(asoc
))
6294 /* Let another process have a go. Since we are going
6297 sctp_release_sock(sk
);
6298 current_timeo
= schedule_timeout(current_timeo
);
6299 BUG_ON(sk
!= asoc
->base
.sk
);
6302 *timeo_p
= current_timeo
;
6306 finish_wait(&asoc
->wait
, &wait
);
6308 /* Release the association's refcnt. */
6309 sctp_association_put(asoc
);
6318 err
= sock_intr_errno(*timeo_p
);
6326 /* If socket sndbuf has changed, wake up all per association waiters. */
6327 void sctp_write_space(struct sock
*sk
)
6329 struct sctp_association
*asoc
;
6331 /* Wake up the tasks in each wait queue. */
6332 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
6333 __sctp_write_space(asoc
);
6337 /* Is there any sndbuf space available on the socket?
6339 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6340 * associations on the same socket. For a UDP-style socket with
6341 * multiple associations, it is possible for it to be "unwriteable"
6342 * prematurely. I assume that this is acceptable because
6343 * a premature "unwriteable" is better than an accidental "writeable" which
6344 * would cause an unwanted block under certain circumstances. For the 1-1
6345 * UDP-style sockets or TCP-style sockets, this code should work.
6348 static int sctp_writeable(struct sock
*sk
)
6352 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
6358 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6359 * returns immediately with EINPROGRESS.
6361 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
6363 struct sock
*sk
= asoc
->base
.sk
;
6365 long current_timeo
= *timeo_p
;
6368 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__
, asoc
,
6371 /* Increment the association's refcnt. */
6372 sctp_association_hold(asoc
);
6375 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6376 TASK_INTERRUPTIBLE
);
6379 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6381 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6384 if (signal_pending(current
))
6385 goto do_interrupted
;
6387 if (sctp_state(asoc
, ESTABLISHED
))
6390 /* Let another process have a go. Since we are going
6393 sctp_release_sock(sk
);
6394 current_timeo
= schedule_timeout(current_timeo
);
6397 *timeo_p
= current_timeo
;
6401 finish_wait(&asoc
->wait
, &wait
);
6403 /* Release the association's refcnt. */
6404 sctp_association_put(asoc
);
6409 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
6412 err
= -ECONNREFUSED
;
6416 err
= sock_intr_errno(*timeo_p
);
6424 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
6426 struct sctp_endpoint
*ep
;
6430 ep
= sctp_sk(sk
)->ep
;
6434 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
,
6435 TASK_INTERRUPTIBLE
);
6437 if (list_empty(&ep
->asocs
)) {
6438 sctp_release_sock(sk
);
6439 timeo
= schedule_timeout(timeo
);
6444 if (!sctp_sstate(sk
, LISTENING
))
6448 if (!list_empty(&ep
->asocs
))
6451 err
= sock_intr_errno(timeo
);
6452 if (signal_pending(current
))
6460 finish_wait(sk
->sk_sleep
, &wait
);
6465 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
6470 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
6471 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
6473 sctp_release_sock(sk
);
6474 timeout
= schedule_timeout(timeout
);
6476 } while (!signal_pending(current
) && timeout
);
6478 finish_wait(sk
->sk_sleep
, &wait
);
6481 static void sctp_sock_rfree_frag(struct sk_buff
*skb
)
6483 struct sk_buff
*frag
;
6488 /* Don't forget the fragments. */
6489 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
6490 sctp_sock_rfree_frag(frag
);
6493 sctp_sock_rfree(skb
);
6496 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
6498 struct sk_buff
*frag
;
6503 /* Don't forget the fragments. */
6504 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
6505 sctp_skb_set_owner_r_frag(frag
, sk
);
6508 sctp_skb_set_owner_r(skb
, sk
);
6511 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6512 * and its messages to the newsk.
6514 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
6515 struct sctp_association
*assoc
,
6516 sctp_socket_type_t type
)
6518 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
6519 struct sctp_sock
*newsp
= sctp_sk(newsk
);
6520 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
6521 struct sctp_endpoint
*newep
= newsp
->ep
;
6522 struct sk_buff
*skb
, *tmp
;
6523 struct sctp_ulpevent
*event
;
6524 struct sctp_bind_hashbucket
*head
;
6526 /* Migrate socket buffer sizes and all the socket level options to the
6529 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
6530 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
6531 /* Brute force copy old sctp opt. */
6532 inet_sk_copy_descendant(newsk
, oldsk
);
6534 /* Restore the ep value that was overwritten with the above structure
6540 /* Hook this new socket in to the bind_hash list. */
6541 head
= &sctp_port_hashtable
[sctp_phashfn(inet_sk(oldsk
)->num
)];
6542 sctp_local_bh_disable();
6543 sctp_spin_lock(&head
->lock
);
6544 pp
= sctp_sk(oldsk
)->bind_hash
;
6545 sk_add_bind_node(newsk
, &pp
->owner
);
6546 sctp_sk(newsk
)->bind_hash
= pp
;
6547 inet_sk(newsk
)->num
= inet_sk(oldsk
)->num
;
6548 sctp_spin_unlock(&head
->lock
);
6549 sctp_local_bh_enable();
6551 /* Copy the bind_addr list from the original endpoint to the new
6552 * endpoint so that we can handle restarts properly
6554 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
6555 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
6557 /* Move any messages in the old socket's receive queue that are for the
6558 * peeled off association to the new socket's receive queue.
6560 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
6561 event
= sctp_skb2event(skb
);
6562 if (event
->asoc
== assoc
) {
6563 sctp_sock_rfree_frag(skb
);
6564 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
6565 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
6566 sctp_skb_set_owner_r_frag(skb
, newsk
);
6570 /* Clean up any messages pending delivery due to partial
6571 * delivery. Three cases:
6572 * 1) No partial deliver; no work.
6573 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6574 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6576 skb_queue_head_init(&newsp
->pd_lobby
);
6577 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
6579 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
6580 struct sk_buff_head
*queue
;
6582 /* Decide which queue to move pd_lobby skbs to. */
6583 if (assoc
->ulpq
.pd_mode
) {
6584 queue
= &newsp
->pd_lobby
;
6586 queue
= &newsk
->sk_receive_queue
;
6588 /* Walk through the pd_lobby, looking for skbs that
6589 * need moved to the new socket.
6591 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6592 event
= sctp_skb2event(skb
);
6593 if (event
->asoc
== assoc
) {
6594 sctp_sock_rfree_frag(skb
);
6595 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6596 __skb_queue_tail(queue
, skb
);
6597 sctp_skb_set_owner_r_frag(skb
, newsk
);
6601 /* Clear up any skbs waiting for the partial
6602 * delivery to finish.
6604 if (assoc
->ulpq
.pd_mode
)
6605 sctp_clear_pd(oldsk
, NULL
);
6609 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
) {
6610 sctp_sock_rfree_frag(skb
);
6611 sctp_skb_set_owner_r_frag(skb
, newsk
);
6614 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
) {
6615 sctp_sock_rfree_frag(skb
);
6616 sctp_skb_set_owner_r_frag(skb
, newsk
);
6619 /* Set the type of socket to indicate that it is peeled off from the
6620 * original UDP-style socket or created with the accept() call on a
6621 * TCP-style socket..
6625 /* Mark the new socket "in-use" by the user so that any packets
6626 * that may arrive on the association after we've moved it are
6627 * queued to the backlog. This prevents a potential race between
6628 * backlog processing on the old socket and new-packet processing
6629 * on the new socket.
6631 * The caller has just allocated newsk so we can guarantee that other
6632 * paths won't try to lock it and then oldsk.
6634 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
6635 sctp_assoc_migrate(assoc
, newsk
);
6637 /* If the association on the newsk is already closed before accept()
6638 * is called, set RCV_SHUTDOWN flag.
6640 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
6641 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
6643 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
6644 sctp_release_sock(newsk
);
6648 /* This proto struct describes the ULP interface for SCTP. */
6649 struct proto sctp_prot
= {
6651 .owner
= THIS_MODULE
,
6652 .close
= sctp_close
,
6653 .connect
= sctp_connect
,
6654 .disconnect
= sctp_disconnect
,
6655 .accept
= sctp_accept
,
6656 .ioctl
= sctp_ioctl
,
6657 .init
= sctp_init_sock
,
6658 .destroy
= sctp_destroy_sock
,
6659 .shutdown
= sctp_shutdown
,
6660 .setsockopt
= sctp_setsockopt
,
6661 .getsockopt
= sctp_getsockopt
,
6662 .sendmsg
= sctp_sendmsg
,
6663 .recvmsg
= sctp_recvmsg
,
6665 .backlog_rcv
= sctp_backlog_rcv
,
6667 .unhash
= sctp_unhash
,
6668 .get_port
= sctp_get_port
,
6669 .obj_size
= sizeof(struct sctp_sock
),
6670 .sysctl_mem
= sysctl_sctp_mem
,
6671 .sysctl_rmem
= sysctl_sctp_rmem
,
6672 .sysctl_wmem
= sysctl_sctp_wmem
,
6673 .memory_pressure
= &sctp_memory_pressure
,
6674 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6675 .memory_allocated
= &sctp_memory_allocated
,
6676 .sockets_allocated
= &sctp_sockets_allocated
,
6679 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6681 struct proto sctpv6_prot
= {
6683 .owner
= THIS_MODULE
,
6684 .close
= sctp_close
,
6685 .connect
= sctp_connect
,
6686 .disconnect
= sctp_disconnect
,
6687 .accept
= sctp_accept
,
6688 .ioctl
= sctp_ioctl
,
6689 .init
= sctp_init_sock
,
6690 .destroy
= sctp_destroy_sock
,
6691 .shutdown
= sctp_shutdown
,
6692 .setsockopt
= sctp_setsockopt
,
6693 .getsockopt
= sctp_getsockopt
,
6694 .sendmsg
= sctp_sendmsg
,
6695 .recvmsg
= sctp_recvmsg
,
6697 .backlog_rcv
= sctp_backlog_rcv
,
6699 .unhash
= sctp_unhash
,
6700 .get_port
= sctp_get_port
,
6701 .obj_size
= sizeof(struct sctp6_sock
),
6702 .sysctl_mem
= sysctl_sctp_mem
,
6703 .sysctl_rmem
= sysctl_sctp_rmem
,
6704 .sysctl_wmem
= sysctl_sctp_wmem
,
6705 .memory_pressure
= &sctp_memory_pressure
,
6706 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6707 .memory_allocated
= &sctp_memory_allocated
,
6708 .sockets_allocated
= &sctp_sockets_allocated
,
6710 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */