1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
18 * This SCTP implementation is free software;
19 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
24 * This SCTP implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, write to
32 * the Free Software Foundation, 59 Temple Place - Suite 330,
33 * Boston, MA 02111-1307, USA.
35 * Please send any bug reports or fixes you make to the
37 * lksctp developers <lksctp-developers@lists.sourceforge.net>
39 * Or submit a bug report through the following website:
40 * http://www.sf.net/projects/lksctp
42 * Written or modified by:
43 * La Monte H.P. Yarroll <piggy@acm.org>
44 * Narasimha Budihal <narsi@refcode.org>
45 * Karl Knutson <karl@athena.chicago.il.us>
46 * Jon Grimm <jgrimm@us.ibm.com>
47 * Xingang Guo <xingang.guo@intel.com>
48 * Daisy Chang <daisyc@us.ibm.com>
49 * Sridhar Samudrala <samudrala@us.ibm.com>
50 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
51 * Ardelle Fan <ardelle.fan@intel.com>
52 * Ryan Layer <rmlayer@us.ibm.com>
53 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
54 * Kevin Gao <kevin.gao@intel.com>
56 * Any bugs reported given to us we will try to fix... any fixes shared will
57 * be incorporated into the next SCTP release.
60 #include <linux/types.h>
61 #include <linux/kernel.h>
62 #include <linux/wait.h>
63 #include <linux/time.h>
65 #include <linux/capability.h>
66 #include <linux/fcntl.h>
67 #include <linux/poll.h>
68 #include <linux/init.h>
69 #include <linux/crypto.h>
73 #include <net/route.h>
75 #include <net/inet_common.h>
77 #include <linux/socket.h> /* for sa_family_t */
79 #include <net/sctp/sctp.h>
80 #include <net/sctp/sm.h>
82 /* WARNING: Please do not remove the SCTP_STATIC attribute to
83 * any of the functions below as they are used to export functions
84 * used by a project regression testsuite.
87 /* Forward declarations for internal helper functions. */
88 static int sctp_writeable(struct sock
*sk
);
89 static void sctp_wfree(struct sk_buff
*skb
);
90 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
92 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
);
93 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
94 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
95 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
96 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
97 union sctp_addr
*addr
, int len
);
98 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
99 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
100 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
101 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
102 static int sctp_send_asconf(struct sctp_association
*asoc
,
103 struct sctp_chunk
*chunk
);
104 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
105 static int sctp_autobind(struct sock
*sk
);
106 static void sctp_sock_migrate(struct sock
*, struct sock
*,
107 struct sctp_association
*, sctp_socket_type_t
);
108 static char *sctp_hmac_alg
= SCTP_COOKIE_HMAC_ALG
;
110 extern struct kmem_cache
*sctp_bucket_cachep
;
111 extern int sysctl_sctp_mem
[3];
112 extern int sysctl_sctp_rmem
[3];
113 extern int sysctl_sctp_wmem
[3];
115 static int sctp_memory_pressure
;
116 static atomic_t sctp_memory_allocated
;
117 static atomic_t sctp_sockets_allocated
;
119 static void sctp_enter_memory_pressure(void)
121 sctp_memory_pressure
= 1;
125 /* Get the sndbuf space available at the time on the association. */
126 static inline int sctp_wspace(struct sctp_association
*asoc
)
130 if (asoc
->ep
->sndbuf_policy
)
131 amt
= asoc
->sndbuf_used
;
133 amt
= atomic_read(&asoc
->base
.sk
->sk_wmem_alloc
);
135 if (amt
>= asoc
->base
.sk
->sk_sndbuf
) {
136 if (asoc
->base
.sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)
139 amt
= sk_stream_wspace(asoc
->base
.sk
);
144 amt
= asoc
->base
.sk
->sk_sndbuf
- amt
;
149 /* Increment the used sndbuf space count of the corresponding association by
150 * the size of the outgoing data chunk.
151 * Also, set the skb destructor for sndbuf accounting later.
153 * Since it is always 1-1 between chunk and skb, and also a new skb is always
154 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
155 * destructor in the data chunk skb for the purpose of the sndbuf space
158 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
160 struct sctp_association
*asoc
= chunk
->asoc
;
161 struct sock
*sk
= asoc
->base
.sk
;
163 /* The sndbuf space is tracked per association. */
164 sctp_association_hold(asoc
);
166 skb_set_owner_w(chunk
->skb
, sk
);
168 chunk
->skb
->destructor
= sctp_wfree
;
169 /* Save the chunk pointer in skb for sctp_wfree to use later. */
170 *((struct sctp_chunk
**)(chunk
->skb
->cb
)) = chunk
;
172 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
173 sizeof(struct sk_buff
) +
174 sizeof(struct sctp_chunk
);
176 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
177 sk
->sk_wmem_queued
+= chunk
->skb
->truesize
;
178 sk_mem_charge(sk
, chunk
->skb
->truesize
);
181 /* Verify that this is a valid address. */
182 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
187 /* Verify basic sockaddr. */
188 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
192 /* Is this a valid SCTP address? */
193 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
196 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
202 /* Look up the association by its id. If this is not a UDP-style
203 * socket, the ID field is always ignored.
205 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
207 struct sctp_association
*asoc
= NULL
;
209 /* If this is not a UDP-style socket, assoc id should be ignored. */
210 if (!sctp_style(sk
, UDP
)) {
211 /* Return NULL if the socket state is not ESTABLISHED. It
212 * could be a TCP-style listening socket or a socket which
213 * hasn't yet called connect() to establish an association.
215 if (!sctp_sstate(sk
, ESTABLISHED
))
218 /* Get the first and the only association from the list. */
219 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
220 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
221 struct sctp_association
, asocs
);
225 /* Otherwise this is a UDP-style socket. */
226 if (!id
|| (id
== (sctp_assoc_t
)-1))
229 spin_lock_bh(&sctp_assocs_id_lock
);
230 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
231 spin_unlock_bh(&sctp_assocs_id_lock
);
233 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
239 /* Look up the transport from an address and an assoc id. If both address and
240 * id are specified, the associations matching the address and the id should be
243 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
244 struct sockaddr_storage
*addr
,
247 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
248 struct sctp_transport
*transport
;
249 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
251 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
258 id_asoc
= sctp_id2assoc(sk
, id
);
259 if (id_asoc
&& (id_asoc
!= addr_asoc
))
262 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
263 (union sctp_addr
*)addr
);
268 /* API 3.1.2 bind() - UDP Style Syntax
269 * The syntax of bind() is,
271 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
273 * sd - the socket descriptor returned by socket().
274 * addr - the address structure (struct sockaddr_in or struct
275 * sockaddr_in6 [RFC 2553]),
276 * addr_len - the size of the address structure.
278 SCTP_STATIC
int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
284 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
287 /* Disallow binding twice. */
288 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
289 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
294 sctp_release_sock(sk
);
299 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
301 /* Verify this is a valid sockaddr. */
302 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
303 union sctp_addr
*addr
, int len
)
307 /* Check minimum size. */
308 if (len
< sizeof (struct sockaddr
))
311 /* Does this PF support this AF? */
312 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
315 /* If we get this far, af is valid. */
316 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
318 if (len
< af
->sockaddr_len
)
324 /* Bind a local address either to an endpoint or to an association. */
325 SCTP_STATIC
int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
327 struct sctp_sock
*sp
= sctp_sk(sk
);
328 struct sctp_endpoint
*ep
= sp
->ep
;
329 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
334 /* Common sockaddr verification. */
335 af
= sctp_sockaddr_af(sp
, addr
, len
);
337 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
342 snum
= ntohs(addr
->v4
.sin_port
);
344 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
345 ", port: %d, new port: %d, len: %d)\n",
351 /* PF specific bind() address verification. */
352 if (!sp
->pf
->bind_verify(sp
, addr
))
353 return -EADDRNOTAVAIL
;
355 /* We must either be unbound, or bind to the same port.
356 * It's OK to allow 0 ports if we are already bound.
357 * We'll just inhert an already bound port in this case
362 else if (snum
!= bp
->port
) {
363 SCTP_DEBUG_PRINTK("sctp_do_bind:"
364 " New port %d does not match existing port "
365 "%d.\n", snum
, bp
->port
);
370 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
373 /* Make sure we are allowed to bind here.
374 * The function sctp_get_port_local() does duplicate address
377 addr
->v4
.sin_port
= htons(snum
);
378 if ((ret
= sctp_get_port_local(sk
, addr
))) {
379 if (ret
== (long) sk
) {
380 /* This endpoint has a conflicting address. */
387 /* Refresh ephemeral port. */
389 bp
->port
= inet_sk(sk
)->num
;
391 /* Add the address to the bind address list.
392 * Use GFP_ATOMIC since BHs will be disabled.
394 ret
= sctp_add_bind_addr(bp
, addr
, SCTP_ADDR_SRC
, GFP_ATOMIC
);
396 /* Copy back into socket for getsockname() use. */
398 inet_sk(sk
)->sport
= htons(inet_sk(sk
)->num
);
399 af
->to_sk_saddr(addr
, sk
);
405 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
407 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
408 * at any one time. If a sender, after sending an ASCONF chunk, decides
409 * it needs to transfer another ASCONF Chunk, it MUST wait until the
410 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
411 * subsequent ASCONF. Note this restriction binds each side, so at any
412 * time two ASCONF may be in-transit on any given association (one sent
413 * from each endpoint).
415 static int sctp_send_asconf(struct sctp_association
*asoc
,
416 struct sctp_chunk
*chunk
)
420 /* If there is an outstanding ASCONF chunk, queue it for later
423 if (asoc
->addip_last_asconf
) {
424 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
428 /* Hold the chunk until an ASCONF_ACK is received. */
429 sctp_chunk_hold(chunk
);
430 retval
= sctp_primitive_ASCONF(asoc
, chunk
);
432 sctp_chunk_free(chunk
);
434 asoc
->addip_last_asconf
= chunk
;
440 /* Add a list of addresses as bind addresses to local endpoint or
443 * Basically run through each address specified in the addrs/addrcnt
444 * array/length pair, determine if it is IPv6 or IPv4 and call
445 * sctp_do_bind() on it.
447 * If any of them fails, then the operation will be reversed and the
448 * ones that were added will be removed.
450 * Only sctp_setsockopt_bindx() is supposed to call this function.
452 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
457 struct sockaddr
*sa_addr
;
460 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
464 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
465 /* The list may contain either IPv4 or IPv6 address;
466 * determine the address length for walking thru the list.
468 sa_addr
= (struct sockaddr
*)addr_buf
;
469 af
= sctp_get_af_specific(sa_addr
->sa_family
);
475 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
478 addr_buf
+= af
->sockaddr_len
;
482 /* Failed. Cleanup the ones that have been added */
484 sctp_bindx_rem(sk
, addrs
, cnt
);
492 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
493 * associations that are part of the endpoint indicating that a list of local
494 * addresses are added to the endpoint.
496 * If any of the addresses is already in the bind address list of the
497 * association, we do not send the chunk for that association. But it will not
498 * affect other associations.
500 * Only sctp_setsockopt_bindx() is supposed to call this function.
502 static int sctp_send_asconf_add_ip(struct sock
*sk
,
503 struct sockaddr
*addrs
,
506 struct sctp_sock
*sp
;
507 struct sctp_endpoint
*ep
;
508 struct sctp_association
*asoc
;
509 struct sctp_bind_addr
*bp
;
510 struct sctp_chunk
*chunk
;
511 struct sctp_sockaddr_entry
*laddr
;
512 union sctp_addr
*addr
;
513 union sctp_addr saveaddr
;
520 if (!sctp_addip_enable
)
526 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
527 __func__
, sk
, addrs
, addrcnt
);
529 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
531 if (!asoc
->peer
.asconf_capable
)
534 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
537 if (!sctp_state(asoc
, ESTABLISHED
))
540 /* Check if any address in the packed array of addresses is
541 * in the bind address list of the association. If so,
542 * do not send the asconf chunk to its peer, but continue with
543 * other associations.
546 for (i
= 0; i
< addrcnt
; i
++) {
547 addr
= (union sctp_addr
*)addr_buf
;
548 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
554 if (sctp_assoc_lookup_laddr(asoc
, addr
))
557 addr_buf
+= af
->sockaddr_len
;
562 /* Use the first valid address in bind addr list of
563 * association as Address Parameter of ASCONF CHUNK.
565 bp
= &asoc
->base
.bind_addr
;
566 p
= bp
->address_list
.next
;
567 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
568 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
569 addrcnt
, SCTP_PARAM_ADD_IP
);
575 retval
= sctp_send_asconf(asoc
, chunk
);
579 /* Add the new addresses to the bind address list with
580 * use_as_src set to 0.
583 for (i
= 0; i
< addrcnt
; i
++) {
584 addr
= (union sctp_addr
*)addr_buf
;
585 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
586 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
587 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
588 SCTP_ADDR_NEW
, GFP_ATOMIC
);
589 addr_buf
+= af
->sockaddr_len
;
597 /* Remove a list of addresses from bind addresses list. Do not remove the
600 * Basically run through each address specified in the addrs/addrcnt
601 * array/length pair, determine if it is IPv6 or IPv4 and call
602 * sctp_del_bind() on it.
604 * If any of them fails, then the operation will be reversed and the
605 * ones that were removed will be added back.
607 * At least one address has to be left; if only one address is
608 * available, the operation will return -EBUSY.
610 * Only sctp_setsockopt_bindx() is supposed to call this function.
612 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
614 struct sctp_sock
*sp
= sctp_sk(sk
);
615 struct sctp_endpoint
*ep
= sp
->ep
;
617 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
620 union sctp_addr
*sa_addr
;
623 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
627 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
628 /* If the bind address list is empty or if there is only one
629 * bind address, there is nothing more to be removed (we need
630 * at least one address here).
632 if (list_empty(&bp
->address_list
) ||
633 (sctp_list_single_entry(&bp
->address_list
))) {
638 sa_addr
= (union sctp_addr
*)addr_buf
;
639 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
645 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
646 retval
= -EADDRNOTAVAIL
;
650 if (sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
655 /* FIXME - There is probably a need to check if sk->sk_saddr and
656 * sk->sk_rcv_addr are currently set to one of the addresses to
657 * be removed. This is something which needs to be looked into
658 * when we are fixing the outstanding issues with multi-homing
659 * socket routing and failover schemes. Refer to comments in
660 * sctp_do_bind(). -daisy
662 retval
= sctp_del_bind_addr(bp
, sa_addr
);
664 addr_buf
+= af
->sockaddr_len
;
667 /* Failed. Add the ones that has been removed back */
669 sctp_bindx_add(sk
, addrs
, cnt
);
677 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
678 * the associations that are part of the endpoint indicating that a list of
679 * local addresses are removed from the endpoint.
681 * If any of the addresses is already in the bind address list of the
682 * association, we do not send the chunk for that association. But it will not
683 * affect other associations.
685 * Only sctp_setsockopt_bindx() is supposed to call this function.
687 static int sctp_send_asconf_del_ip(struct sock
*sk
,
688 struct sockaddr
*addrs
,
691 struct sctp_sock
*sp
;
692 struct sctp_endpoint
*ep
;
693 struct sctp_association
*asoc
;
694 struct sctp_transport
*transport
;
695 struct sctp_bind_addr
*bp
;
696 struct sctp_chunk
*chunk
;
697 union sctp_addr
*laddr
;
700 struct sctp_sockaddr_entry
*saddr
;
704 if (!sctp_addip_enable
)
710 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
711 __func__
, sk
, addrs
, addrcnt
);
713 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
715 if (!asoc
->peer
.asconf_capable
)
718 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
721 if (!sctp_state(asoc
, ESTABLISHED
))
724 /* Check if any address in the packed array of addresses is
725 * not present in the bind address list of the association.
726 * If so, do not send the asconf chunk to its peer, but
727 * continue with other associations.
730 for (i
= 0; i
< addrcnt
; i
++) {
731 laddr
= (union sctp_addr
*)addr_buf
;
732 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
738 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
741 addr_buf
+= af
->sockaddr_len
;
746 /* Find one address in the association's bind address list
747 * that is not in the packed array of addresses. This is to
748 * make sure that we do not delete all the addresses in the
751 bp
= &asoc
->base
.bind_addr
;
752 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
757 /* We do not need RCU protection throughout this loop
758 * because this is done under a socket lock from the
761 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
768 /* Reset use_as_src flag for the addresses in the bind address
769 * list that are to be deleted.
772 for (i
= 0; i
< addrcnt
; i
++) {
773 laddr
= (union sctp_addr
*)addr_buf
;
774 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
775 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
776 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
777 saddr
->state
= SCTP_ADDR_DEL
;
779 addr_buf
+= af
->sockaddr_len
;
782 /* Update the route and saddr entries for all the transports
783 * as some of the addresses in the bind address list are
784 * about to be deleted and cannot be used as source addresses.
786 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
788 dst_release(transport
->dst
);
789 sctp_transport_route(transport
, NULL
,
790 sctp_sk(asoc
->base
.sk
));
793 retval
= sctp_send_asconf(asoc
, chunk
);
799 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
802 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
805 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
806 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
809 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
810 * Section 3.1.2 for this usage.
812 * addrs is a pointer to an array of one or more socket addresses. Each
813 * address is contained in its appropriate structure (i.e. struct
814 * sockaddr_in or struct sockaddr_in6) the family of the address type
815 * must be used to distinguish the address length (note that this
816 * representation is termed a "packed array" of addresses). The caller
817 * specifies the number of addresses in the array with addrcnt.
819 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
820 * -1, and sets errno to the appropriate error code.
822 * For SCTP, the port given in each socket address must be the same, or
823 * sctp_bindx() will fail, setting errno to EINVAL.
825 * The flags parameter is formed from the bitwise OR of zero or more of
826 * the following currently defined flags:
828 * SCTP_BINDX_ADD_ADDR
830 * SCTP_BINDX_REM_ADDR
832 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
833 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
834 * addresses from the association. The two flags are mutually exclusive;
835 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
836 * not remove all addresses from an association; sctp_bindx() will
837 * reject such an attempt with EINVAL.
839 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
840 * additional addresses with an endpoint after calling bind(). Or use
841 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
842 * socket is associated with so that no new association accepted will be
843 * associated with those addresses. If the endpoint supports dynamic
844 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
845 * endpoint to send the appropriate message to the peer to change the
846 * peers address lists.
848 * Adding and removing addresses from a connected association is
849 * optional functionality. Implementations that do not support this
850 * functionality should return EOPNOTSUPP.
852 * Basically do nothing but copying the addresses from user to kernel
853 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
854 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
857 * We don't use copy_from_user() for optimization: we first do the
858 * sanity checks (buffer size -fast- and access check-healthy
859 * pointer); if all of those succeed, then we can alloc the memory
860 * (expensive operation) needed to copy the data to kernel. Then we do
861 * the copying without checking the user space area
862 * (__copy_from_user()).
864 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
867 * sk The sk of the socket
868 * addrs The pointer to the addresses in user land
869 * addrssize Size of the addrs buffer
870 * op Operation to perform (add or remove, see the flags of
873 * Returns 0 if ok, <0 errno code on error.
875 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
876 struct sockaddr __user
*addrs
,
877 int addrs_size
, int op
)
879 struct sockaddr
*kaddrs
;
883 struct sockaddr
*sa_addr
;
887 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
888 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
890 if (unlikely(addrs_size
<= 0))
893 /* Check the user passed a healthy pointer. */
894 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
897 /* Alloc space for the address array in kernel memory. */
898 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
899 if (unlikely(!kaddrs
))
902 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
907 /* Walk through the addrs buffer and count the number of addresses. */
909 while (walk_size
< addrs_size
) {
910 sa_addr
= (struct sockaddr
*)addr_buf
;
911 af
= sctp_get_af_specific(sa_addr
->sa_family
);
913 /* If the address family is not supported or if this address
914 * causes the address buffer to overflow return EINVAL.
916 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
921 addr_buf
+= af
->sockaddr_len
;
922 walk_size
+= af
->sockaddr_len
;
927 case SCTP_BINDX_ADD_ADDR
:
928 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
931 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
934 case SCTP_BINDX_REM_ADDR
:
935 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
938 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
952 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
954 * Common routine for handling connect() and sctp_connectx().
955 * Connect will come in with just a single address.
957 static int __sctp_connect(struct sock
* sk
,
958 struct sockaddr
*kaddrs
,
961 struct sctp_sock
*sp
;
962 struct sctp_endpoint
*ep
;
963 struct sctp_association
*asoc
= NULL
;
964 struct sctp_association
*asoc2
;
965 struct sctp_transport
*transport
;
973 union sctp_addr
*sa_addr
= NULL
;
976 unsigned int f_flags
= 0;
981 /* connect() cannot be done on a socket that is already in ESTABLISHED
982 * state - UDP-style peeled off socket or a TCP-style socket that
983 * is already connected.
984 * It cannot be done even on a TCP-style listening socket.
986 if (sctp_sstate(sk
, ESTABLISHED
) ||
987 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
992 /* Walk through the addrs buffer and count the number of addresses. */
994 while (walk_size
< addrs_size
) {
995 sa_addr
= (union sctp_addr
*)addr_buf
;
996 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
997 port
= ntohs(sa_addr
->v4
.sin_port
);
999 /* If the address family is not supported or if this address
1000 * causes the address buffer to overflow return EINVAL.
1002 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1007 /* Save current address so we can work with it */
1008 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1010 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1014 /* Make sure the destination port is correctly set
1017 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
)
1021 /* Check if there already is a matching association on the
1022 * endpoint (other than the one created here).
1024 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1025 if (asoc2
&& asoc2
!= asoc
) {
1026 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1033 /* If we could not find a matching association on the endpoint,
1034 * make sure that there is no peeled-off association matching
1035 * the peer address even on another socket.
1037 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1038 err
= -EADDRNOTAVAIL
;
1043 /* If a bind() or sctp_bindx() is not called prior to
1044 * an sctp_connectx() call, the system picks an
1045 * ephemeral port and will choose an address set
1046 * equivalent to binding with a wildcard address.
1048 if (!ep
->base
.bind_addr
.port
) {
1049 if (sctp_autobind(sk
)) {
1055 * If an unprivileged user inherits a 1-many
1056 * style socket with open associations on a
1057 * privileged port, it MAY be permitted to
1058 * accept new associations, but it SHOULD NOT
1059 * be permitted to open new associations.
1061 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1062 !capable(CAP_NET_BIND_SERVICE
)) {
1068 scope
= sctp_scope(&to
);
1069 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1076 /* Prime the peer's transport structures. */
1077 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1085 addr_buf
+= af
->sockaddr_len
;
1086 walk_size
+= af
->sockaddr_len
;
1089 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1094 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1099 /* Initialize sk's dport and daddr for getpeername() */
1100 inet_sk(sk
)->dport
= htons(asoc
->peer
.port
);
1101 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1102 af
->to_sk_daddr(sa_addr
, sk
);
1105 /* in-kernel sockets don't generally have a file allocated to them
1106 * if all they do is call sock_create_kern().
1108 if (sk
->sk_socket
->file
)
1109 f_flags
= sk
->sk_socket
->file
->f_flags
;
1111 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1113 err
= sctp_wait_for_connect(asoc
, &timeo
);
1115 /* Don't free association on exit. */
1120 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1121 " kaddrs: %p err: %d\n",
1124 sctp_association_free(asoc
);
1128 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1131 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
1133 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1134 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1135 * or IPv6 addresses.
1137 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1138 * Section 3.1.2 for this usage.
1140 * addrs is a pointer to an array of one or more socket addresses. Each
1141 * address is contained in its appropriate structure (i.e. struct
1142 * sockaddr_in or struct sockaddr_in6) the family of the address type
1143 * must be used to distengish the address length (note that this
1144 * representation is termed a "packed array" of addresses). The caller
1145 * specifies the number of addresses in the array with addrcnt.
1147 * On success, sctp_connectx() returns 0. On failure, sctp_connectx() returns
1148 * -1, and sets errno to the appropriate error code.
1150 * For SCTP, the port given in each socket address must be the same, or
1151 * sctp_connectx() will fail, setting errno to EINVAL.
1153 * An application can use sctp_connectx to initiate an association with
1154 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1155 * allows a caller to specify multiple addresses at which a peer can be
1156 * reached. The way the SCTP stack uses the list of addresses to set up
1157 * the association is implementation dependant. This function only
1158 * specifies that the stack will try to make use of all the addresses in
1159 * the list when needed.
1161 * Note that the list of addresses passed in is only used for setting up
1162 * the association. It does not necessarily equal the set of addresses
1163 * the peer uses for the resulting association. If the caller wants to
1164 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1165 * retrieve them after the association has been set up.
1167 * Basically do nothing but copying the addresses from user to kernel
1168 * land and invoking either sctp_connectx(). This is used for tunneling
1169 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1171 * We don't use copy_from_user() for optimization: we first do the
1172 * sanity checks (buffer size -fast- and access check-healthy
1173 * pointer); if all of those succeed, then we can alloc the memory
1174 * (expensive operation) needed to copy the data to kernel. Then we do
1175 * the copying without checking the user space area
1176 * (__copy_from_user()).
1178 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1181 * sk The sk of the socket
1182 * addrs The pointer to the addresses in user land
1183 * addrssize Size of the addrs buffer
1185 * Returns 0 if ok, <0 errno code on error.
1187 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1188 struct sockaddr __user
*addrs
,
1192 struct sockaddr
*kaddrs
;
1194 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1195 __func__
, sk
, addrs
, addrs_size
);
1197 if (unlikely(addrs_size
<= 0))
1200 /* Check the user passed a healthy pointer. */
1201 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1204 /* Alloc space for the address array in kernel memory. */
1205 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1206 if (unlikely(!kaddrs
))
1209 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1212 err
= __sctp_connect(sk
, kaddrs
, addrs_size
);
1219 /* API 3.1.4 close() - UDP Style Syntax
1220 * Applications use close() to perform graceful shutdown (as described in
1221 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1222 * by a UDP-style socket.
1226 * ret = close(int sd);
1228 * sd - the socket descriptor of the associations to be closed.
1230 * To gracefully shutdown a specific association represented by the
1231 * UDP-style socket, an application should use the sendmsg() call,
1232 * passing no user data, but including the appropriate flag in the
1233 * ancillary data (see Section xxxx).
1235 * If sd in the close() call is a branched-off socket representing only
1236 * one association, the shutdown is performed on that association only.
1238 * 4.1.6 close() - TCP Style Syntax
1240 * Applications use close() to gracefully close down an association.
1244 * int close(int sd);
1246 * sd - the socket descriptor of the association to be closed.
1248 * After an application calls close() on a socket descriptor, no further
1249 * socket operations will succeed on that descriptor.
1251 * API 7.1.4 SO_LINGER
1253 * An application using the TCP-style socket can use this option to
1254 * perform the SCTP ABORT primitive. The linger option structure is:
1257 * int l_onoff; // option on/off
1258 * int l_linger; // linger time
1261 * To enable the option, set l_onoff to 1. If the l_linger value is set
1262 * to 0, calling close() is the same as the ABORT primitive. If the
1263 * value is set to a negative value, the setsockopt() call will return
1264 * an error. If the value is set to a positive value linger_time, the
1265 * close() can be blocked for at most linger_time ms. If the graceful
1266 * shutdown phase does not finish during this period, close() will
1267 * return but the graceful shutdown phase continues in the system.
1269 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1271 struct sctp_endpoint
*ep
;
1272 struct sctp_association
*asoc
;
1273 struct list_head
*pos
, *temp
;
1275 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1278 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1280 ep
= sctp_sk(sk
)->ep
;
1282 /* Walk all associations on an endpoint. */
1283 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1284 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1286 if (sctp_style(sk
, TCP
)) {
1287 /* A closed association can still be in the list if
1288 * it belongs to a TCP-style listening socket that is
1289 * not yet accepted. If so, free it. If not, send an
1290 * ABORT or SHUTDOWN based on the linger options.
1292 if (sctp_state(asoc
, CLOSED
)) {
1293 sctp_unhash_established(asoc
);
1294 sctp_association_free(asoc
);
1299 if (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
) {
1300 struct sctp_chunk
*chunk
;
1302 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1304 sctp_primitive_ABORT(asoc
, chunk
);
1306 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1309 /* Clean up any skbs sitting on the receive queue. */
1310 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1311 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1313 /* On a TCP-style socket, block for at most linger_time if set. */
1314 if (sctp_style(sk
, TCP
) && timeout
)
1315 sctp_wait_for_close(sk
, timeout
);
1317 /* This will run the backlog queue. */
1318 sctp_release_sock(sk
);
1320 /* Supposedly, no process has access to the socket, but
1321 * the net layers still may.
1323 sctp_local_bh_disable();
1324 sctp_bh_lock_sock(sk
);
1326 /* Hold the sock, since sk_common_release() will put sock_put()
1327 * and we have just a little more cleanup.
1330 sk_common_release(sk
);
1332 sctp_bh_unlock_sock(sk
);
1333 sctp_local_bh_enable();
1337 SCTP_DBG_OBJCNT_DEC(sock
);
1340 /* Handle EPIPE error. */
1341 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1344 err
= sock_error(sk
) ? : -EPIPE
;
1345 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1346 send_sig(SIGPIPE
, current
, 0);
1350 /* API 3.1.3 sendmsg() - UDP Style Syntax
1352 * An application uses sendmsg() and recvmsg() calls to transmit data to
1353 * and receive data from its peer.
1355 * ssize_t sendmsg(int socket, const struct msghdr *message,
1358 * socket - the socket descriptor of the endpoint.
1359 * message - pointer to the msghdr structure which contains a single
1360 * user message and possibly some ancillary data.
1362 * See Section 5 for complete description of the data
1365 * flags - flags sent or received with the user message, see Section
1366 * 5 for complete description of the flags.
1368 * Note: This function could use a rewrite especially when explicit
1369 * connect support comes in.
1371 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1373 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1375 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1376 struct msghdr
*msg
, size_t msg_len
)
1378 struct sctp_sock
*sp
;
1379 struct sctp_endpoint
*ep
;
1380 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1381 struct sctp_transport
*transport
, *chunk_tp
;
1382 struct sctp_chunk
*chunk
;
1384 struct sockaddr
*msg_name
= NULL
;
1385 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1386 struct sctp_sndrcvinfo
*sinfo
;
1387 struct sctp_initmsg
*sinit
;
1388 sctp_assoc_t associd
= 0;
1389 sctp_cmsgs_t cmsgs
= { NULL
};
1393 __u16 sinfo_flags
= 0;
1394 struct sctp_datamsg
*datamsg
;
1395 int msg_flags
= msg
->msg_flags
;
1397 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1404 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1406 /* We cannot send a message over a TCP-style listening socket. */
1407 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1412 /* Parse out the SCTP CMSGs. */
1413 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1416 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1420 /* Fetch the destination address for this packet. This
1421 * address only selects the association--it is not necessarily
1422 * the address we will send to.
1423 * For a peeled-off socket, msg_name is ignored.
1425 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1426 int msg_namelen
= msg
->msg_namelen
;
1428 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1433 if (msg_namelen
> sizeof(to
))
1434 msg_namelen
= sizeof(to
);
1435 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1436 msg_name
= msg
->msg_name
;
1442 /* Did the user specify SNDRCVINFO? */
1444 sinfo_flags
= sinfo
->sinfo_flags
;
1445 associd
= sinfo
->sinfo_assoc_id
;
1448 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1449 msg_len
, sinfo_flags
);
1451 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1452 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1457 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1458 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1459 * If SCTP_ABORT is set, the message length could be non zero with
1460 * the msg_iov set to the user abort reason.
1462 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1463 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1468 /* If SCTP_ADDR_OVER is set, there must be an address
1469 * specified in msg_name.
1471 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1478 SCTP_DEBUG_PRINTK("About to look up association.\n");
1482 /* If a msg_name has been specified, assume this is to be used. */
1484 /* Look for a matching association on the endpoint. */
1485 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1487 /* If we could not find a matching association on the
1488 * endpoint, make sure that it is not a TCP-style
1489 * socket that already has an association or there is
1490 * no peeled-off association on another socket.
1492 if ((sctp_style(sk
, TCP
) &&
1493 sctp_sstate(sk
, ESTABLISHED
)) ||
1494 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1495 err
= -EADDRNOTAVAIL
;
1500 asoc
= sctp_id2assoc(sk
, associd
);
1508 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1510 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1511 * socket that has an association in CLOSED state. This can
1512 * happen when an accepted socket has an association that is
1515 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1520 if (sinfo_flags
& SCTP_EOF
) {
1521 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1523 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1527 if (sinfo_flags
& SCTP_ABORT
) {
1529 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1535 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1536 sctp_primitive_ABORT(asoc
, chunk
);
1542 /* Do we need to create the association? */
1544 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1546 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1551 /* Check for invalid stream against the stream counts,
1552 * either the default or the user specified stream counts.
1555 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1556 /* Check against the defaults. */
1557 if (sinfo
->sinfo_stream
>=
1558 sp
->initmsg
.sinit_num_ostreams
) {
1563 /* Check against the requested. */
1564 if (sinfo
->sinfo_stream
>=
1565 sinit
->sinit_num_ostreams
) {
1573 * API 3.1.2 bind() - UDP Style Syntax
1574 * If a bind() or sctp_bindx() is not called prior to a
1575 * sendmsg() call that initiates a new association, the
1576 * system picks an ephemeral port and will choose an address
1577 * set equivalent to binding with a wildcard address.
1579 if (!ep
->base
.bind_addr
.port
) {
1580 if (sctp_autobind(sk
)) {
1586 * If an unprivileged user inherits a one-to-many
1587 * style socket with open associations on a privileged
1588 * port, it MAY be permitted to accept new associations,
1589 * but it SHOULD NOT be permitted to open new
1592 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1593 !capable(CAP_NET_BIND_SERVICE
)) {
1599 scope
= sctp_scope(&to
);
1600 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1607 /* If the SCTP_INIT ancillary data is specified, set all
1608 * the association init values accordingly.
1611 if (sinit
->sinit_num_ostreams
) {
1612 asoc
->c
.sinit_num_ostreams
=
1613 sinit
->sinit_num_ostreams
;
1615 if (sinit
->sinit_max_instreams
) {
1616 asoc
->c
.sinit_max_instreams
=
1617 sinit
->sinit_max_instreams
;
1619 if (sinit
->sinit_max_attempts
) {
1620 asoc
->max_init_attempts
1621 = sinit
->sinit_max_attempts
;
1623 if (sinit
->sinit_max_init_timeo
) {
1624 asoc
->max_init_timeo
=
1625 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1629 /* Prime the peer's transport structures. */
1630 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1635 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1642 /* ASSERT: we have a valid association at this point. */
1643 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1646 /* If the user didn't specify SNDRCVINFO, make up one with
1649 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1650 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1651 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1652 default_sinfo
.sinfo_context
= asoc
->default_context
;
1653 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1654 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1655 sinfo
= &default_sinfo
;
1658 /* API 7.1.7, the sndbuf size per association bounds the
1659 * maximum size of data that can be sent in a single send call.
1661 if (msg_len
> sk
->sk_sndbuf
) {
1666 if (asoc
->pmtu_pending
)
1667 sctp_assoc_pending_pmtu(asoc
);
1669 /* If fragmentation is disabled and the message length exceeds the
1670 * association fragmentation point, return EMSGSIZE. The I-D
1671 * does not specify what this error is, but this looks like
1674 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1680 /* Check for invalid stream. */
1681 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1687 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1688 if (!sctp_wspace(asoc
)) {
1689 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1694 /* If an address is passed with the sendto/sendmsg call, it is used
1695 * to override the primary destination address in the TCP model, or
1696 * when SCTP_ADDR_OVER flag is set in the UDP model.
1698 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1699 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1700 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1708 /* Auto-connect, if we aren't connected already. */
1709 if (sctp_state(asoc
, CLOSED
)) {
1710 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1713 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1716 /* Break the message into multiple chunks of maximum size. */
1717 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1723 /* Now send the (possibly) fragmented message. */
1724 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1725 sctp_chunk_hold(chunk
);
1727 /* Do accounting for the write space. */
1728 sctp_set_owner_w(chunk
);
1730 chunk
->transport
= chunk_tp
;
1732 /* Send it to the lower layers. Note: all chunks
1733 * must either fail or succeed. The lower layer
1734 * works that way today. Keep it that way or this
1737 err
= sctp_primitive_SEND(asoc
, chunk
);
1738 /* Did the lower layer accept the chunk? */
1740 sctp_chunk_free(chunk
);
1741 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1744 sctp_datamsg_put(datamsg
);
1750 /* If we are already past ASSOCIATE, the lower
1751 * layers are responsible for association cleanup.
1757 sctp_association_free(asoc
);
1759 sctp_release_sock(sk
);
1762 return sctp_error(sk
, msg_flags
, err
);
1769 err
= sock_error(sk
);
1779 /* This is an extended version of skb_pull() that removes the data from the
1780 * start of a skb even when data is spread across the list of skb's in the
1781 * frag_list. len specifies the total amount of data that needs to be removed.
1782 * when 'len' bytes could be removed from the skb, it returns 0.
1783 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1784 * could not be removed.
1786 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1788 struct sk_buff
*list
;
1789 int skb_len
= skb_headlen(skb
);
1792 if (len
<= skb_len
) {
1793 __skb_pull(skb
, len
);
1797 __skb_pull(skb
, skb_len
);
1799 for (list
= skb_shinfo(skb
)->frag_list
; list
; list
= list
->next
) {
1800 rlen
= sctp_skb_pull(list
, len
);
1801 skb
->len
-= (len
-rlen
);
1802 skb
->data_len
-= (len
-rlen
);
1813 /* API 3.1.3 recvmsg() - UDP Style Syntax
1815 * ssize_t recvmsg(int socket, struct msghdr *message,
1818 * socket - the socket descriptor of the endpoint.
1819 * message - pointer to the msghdr structure which contains a single
1820 * user message and possibly some ancillary data.
1822 * See Section 5 for complete description of the data
1825 * flags - flags sent or received with the user message, see Section
1826 * 5 for complete description of the flags.
1828 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1830 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1831 struct msghdr
*msg
, size_t len
, int noblock
,
1832 int flags
, int *addr_len
)
1834 struct sctp_ulpevent
*event
= NULL
;
1835 struct sctp_sock
*sp
= sctp_sk(sk
);
1836 struct sk_buff
*skb
;
1841 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1842 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1843 "len", len
, "knoblauch", noblock
,
1844 "flags", flags
, "addr_len", addr_len
);
1848 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1853 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1857 /* Get the total length of the skb including any skb's in the
1866 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1868 event
= sctp_skb2event(skb
);
1873 sock_recv_timestamp(msg
, sk
, skb
);
1874 if (sctp_ulpevent_is_notification(event
)) {
1875 msg
->msg_flags
|= MSG_NOTIFICATION
;
1876 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1878 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1881 /* Check if we allow SCTP_SNDRCVINFO. */
1882 if (sp
->subscribe
.sctp_data_io_event
)
1883 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1885 /* FIXME: we should be calling IP/IPv6 layers. */
1886 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1887 ip_cmsg_recv(msg
, skb
);
1892 /* If skb's length exceeds the user's buffer, update the skb and
1893 * push it back to the receive_queue so that the next call to
1894 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1896 if (skb_len
> copied
) {
1897 msg
->msg_flags
&= ~MSG_EOR
;
1898 if (flags
& MSG_PEEK
)
1900 sctp_skb_pull(skb
, copied
);
1901 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1903 /* When only partial message is copied to the user, increase
1904 * rwnd by that amount. If all the data in the skb is read,
1905 * rwnd is updated when the event is freed.
1907 if (!sctp_ulpevent_is_notification(event
))
1908 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
1910 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
1911 (event
->msg_flags
& MSG_EOR
))
1912 msg
->msg_flags
|= MSG_EOR
;
1914 msg
->msg_flags
&= ~MSG_EOR
;
1917 if (flags
& MSG_PEEK
) {
1918 /* Release the skb reference acquired after peeking the skb in
1919 * sctp_skb_recv_datagram().
1923 /* Free the event which includes releasing the reference to
1924 * the owner of the skb, freeing the skb and updating the
1927 sctp_ulpevent_free(event
);
1930 sctp_release_sock(sk
);
1934 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1936 * This option is a on/off flag. If enabled no SCTP message
1937 * fragmentation will be performed. Instead if a message being sent
1938 * exceeds the current PMTU size, the message will NOT be sent and
1939 * instead a error will be indicated to the user.
1941 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
1942 char __user
*optval
, int optlen
)
1946 if (optlen
< sizeof(int))
1949 if (get_user(val
, (int __user
*)optval
))
1952 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
1957 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
1960 if (optlen
> sizeof(struct sctp_event_subscribe
))
1962 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
1967 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
1969 * This socket option is applicable to the UDP-style socket only. When
1970 * set it will cause associations that are idle for more than the
1971 * specified number of seconds to automatically close. An association
1972 * being idle is defined an association that has NOT sent or received
1973 * user data. The special value of '0' indicates that no automatic
1974 * close of any associations should be performed. The option expects an
1975 * integer defining the number of seconds of idle time before an
1976 * association is closed.
1978 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
1981 struct sctp_sock
*sp
= sctp_sk(sk
);
1983 /* Applicable to UDP-style socket only */
1984 if (sctp_style(sk
, TCP
))
1986 if (optlen
!= sizeof(int))
1988 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
1994 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
1996 * Applications can enable or disable heartbeats for any peer address of
1997 * an association, modify an address's heartbeat interval, force a
1998 * heartbeat to be sent immediately, and adjust the address's maximum
1999 * number of retransmissions sent before an address is considered
2000 * unreachable. The following structure is used to access and modify an
2001 * address's parameters:
2003 * struct sctp_paddrparams {
2004 * sctp_assoc_t spp_assoc_id;
2005 * struct sockaddr_storage spp_address;
2006 * uint32_t spp_hbinterval;
2007 * uint16_t spp_pathmaxrxt;
2008 * uint32_t spp_pathmtu;
2009 * uint32_t spp_sackdelay;
2010 * uint32_t spp_flags;
2013 * spp_assoc_id - (one-to-many style socket) This is filled in the
2014 * application, and identifies the association for
2016 * spp_address - This specifies which address is of interest.
2017 * spp_hbinterval - This contains the value of the heartbeat interval,
2018 * in milliseconds. If a value of zero
2019 * is present in this field then no changes are to
2020 * be made to this parameter.
2021 * spp_pathmaxrxt - This contains the maximum number of
2022 * retransmissions before this address shall be
2023 * considered unreachable. If a value of zero
2024 * is present in this field then no changes are to
2025 * be made to this parameter.
2026 * spp_pathmtu - When Path MTU discovery is disabled the value
2027 * specified here will be the "fixed" path mtu.
2028 * Note that if the spp_address field is empty
2029 * then all associations on this address will
2030 * have this fixed path mtu set upon them.
2032 * spp_sackdelay - When delayed sack is enabled, this value specifies
2033 * the number of milliseconds that sacks will be delayed
2034 * for. This value will apply to all addresses of an
2035 * association if the spp_address field is empty. Note
2036 * also, that if delayed sack is enabled and this
2037 * value is set to 0, no change is made to the last
2038 * recorded delayed sack timer value.
2040 * spp_flags - These flags are used to control various features
2041 * on an association. The flag field may contain
2042 * zero or more of the following options.
2044 * SPP_HB_ENABLE - Enable heartbeats on the
2045 * specified address. Note that if the address
2046 * field is empty all addresses for the association
2047 * have heartbeats enabled upon them.
2049 * SPP_HB_DISABLE - Disable heartbeats on the
2050 * speicifed address. Note that if the address
2051 * field is empty all addresses for the association
2052 * will have their heartbeats disabled. Note also
2053 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2054 * mutually exclusive, only one of these two should
2055 * be specified. Enabling both fields will have
2056 * undetermined results.
2058 * SPP_HB_DEMAND - Request a user initiated heartbeat
2059 * to be made immediately.
2061 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2062 * heartbeat delayis to be set to the value of 0
2065 * SPP_PMTUD_ENABLE - This field will enable PMTU
2066 * discovery upon the specified address. Note that
2067 * if the address feild is empty then all addresses
2068 * on the association are effected.
2070 * SPP_PMTUD_DISABLE - This field will disable PMTU
2071 * discovery upon the specified address. Note that
2072 * if the address feild is empty then all addresses
2073 * on the association are effected. Not also that
2074 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2075 * exclusive. Enabling both will have undetermined
2078 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2079 * on delayed sack. The time specified in spp_sackdelay
2080 * is used to specify the sack delay for this address. Note
2081 * that if spp_address is empty then all addresses will
2082 * enable delayed sack and take on the sack delay
2083 * value specified in spp_sackdelay.
2084 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2085 * off delayed sack. If the spp_address field is blank then
2086 * delayed sack is disabled for the entire association. Note
2087 * also that this field is mutually exclusive to
2088 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2091 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2092 struct sctp_transport
*trans
,
2093 struct sctp_association
*asoc
,
2094 struct sctp_sock
*sp
,
2097 int sackdelay_change
)
2101 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2102 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2107 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2108 * this field is ignored. Note also that a value of zero indicates
2109 * the current setting should be left unchanged.
2111 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2113 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2114 * set. This lets us use 0 value when this flag
2117 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2118 params
->spp_hbinterval
= 0;
2120 if (params
->spp_hbinterval
||
2121 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2124 msecs_to_jiffies(params
->spp_hbinterval
);
2127 msecs_to_jiffies(params
->spp_hbinterval
);
2129 sp
->hbinterval
= params
->spp_hbinterval
;
2136 trans
->param_flags
=
2137 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2140 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2143 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2147 /* When Path MTU discovery is disabled the value specified here will
2148 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2149 * include the flag SPP_PMTUD_DISABLE for this field to have any
2152 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2154 trans
->pathmtu
= params
->spp_pathmtu
;
2155 sctp_assoc_sync_pmtu(asoc
);
2157 asoc
->pathmtu
= params
->spp_pathmtu
;
2158 sctp_frag_point(sp
, params
->spp_pathmtu
);
2160 sp
->pathmtu
= params
->spp_pathmtu
;
2166 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2167 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2168 trans
->param_flags
=
2169 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2171 sctp_transport_pmtu(trans
);
2172 sctp_assoc_sync_pmtu(asoc
);
2176 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2179 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2183 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2184 * value of this field is ignored. Note also that a value of zero
2185 * indicates the current setting should be left unchanged.
2187 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2190 msecs_to_jiffies(params
->spp_sackdelay
);
2193 msecs_to_jiffies(params
->spp_sackdelay
);
2195 sp
->sackdelay
= params
->spp_sackdelay
;
2199 if (sackdelay_change
) {
2201 trans
->param_flags
=
2202 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2206 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2210 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2215 /* Note that unless the spp_flag is set to SPP_PMTUD_ENABLE the value
2216 * of this field is ignored. Note also that a value of zero
2217 * indicates the current setting should be left unchanged.
2219 if ((params
->spp_flags
& SPP_PMTUD_ENABLE
) && params
->spp_pathmaxrxt
) {
2221 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2223 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2225 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2232 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2233 char __user
*optval
, int optlen
)
2235 struct sctp_paddrparams params
;
2236 struct sctp_transport
*trans
= NULL
;
2237 struct sctp_association
*asoc
= NULL
;
2238 struct sctp_sock
*sp
= sctp_sk(sk
);
2240 int hb_change
, pmtud_change
, sackdelay_change
;
2242 if (optlen
!= sizeof(struct sctp_paddrparams
))
2245 if (copy_from_user(¶ms
, optval
, optlen
))
2248 /* Validate flags and value parameters. */
2249 hb_change
= params
.spp_flags
& SPP_HB
;
2250 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2251 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2253 if (hb_change
== SPP_HB
||
2254 pmtud_change
== SPP_PMTUD
||
2255 sackdelay_change
== SPP_SACKDELAY
||
2256 params
.spp_sackdelay
> 500 ||
2258 && params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2261 /* If an address other than INADDR_ANY is specified, and
2262 * no transport is found, then the request is invalid.
2264 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
2265 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2266 params
.spp_assoc_id
);
2271 /* Get association, if assoc_id != 0 and the socket is a one
2272 * to many style socket, and an association was not found, then
2273 * the id was invalid.
2275 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2276 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2279 /* Heartbeat demand can only be sent on a transport or
2280 * association, but not a socket.
2282 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2285 /* Process parameters. */
2286 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2287 hb_change
, pmtud_change
,
2293 /* If changes are for association, also apply parameters to each
2296 if (!trans
&& asoc
) {
2297 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2299 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2300 hb_change
, pmtud_change
,
2308 /* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
2310 * This options will get or set the delayed ack timer. The time is set
2311 * in milliseconds. If the assoc_id is 0, then this sets or gets the
2312 * endpoints default delayed ack timer value. If the assoc_id field is
2313 * non-zero, then the set or get effects the specified association.
2315 * struct sctp_assoc_value {
2316 * sctp_assoc_t assoc_id;
2317 * uint32_t assoc_value;
2320 * assoc_id - This parameter, indicates which association the
2321 * user is preforming an action upon. Note that if
2322 * this field's value is zero then the endpoints
2323 * default value is changed (effecting future
2324 * associations only).
2326 * assoc_value - This parameter contains the number of milliseconds
2327 * that the user is requesting the delayed ACK timer
2328 * be set to. Note that this value is defined in
2329 * the standard to be between 200 and 500 milliseconds.
2331 * Note: a value of zero will leave the value alone,
2332 * but disable SACK delay. A non-zero value will also
2333 * enable SACK delay.
2336 static int sctp_setsockopt_delayed_ack_time(struct sock
*sk
,
2337 char __user
*optval
, int optlen
)
2339 struct sctp_assoc_value params
;
2340 struct sctp_transport
*trans
= NULL
;
2341 struct sctp_association
*asoc
= NULL
;
2342 struct sctp_sock
*sp
= sctp_sk(sk
);
2344 if (optlen
!= sizeof(struct sctp_assoc_value
))
2347 if (copy_from_user(¶ms
, optval
, optlen
))
2350 /* Validate value parameter. */
2351 if (params
.assoc_value
> 500)
2354 /* Get association, if assoc_id != 0 and the socket is a one
2355 * to many style socket, and an association was not found, then
2356 * the id was invalid.
2358 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2359 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
2362 if (params
.assoc_value
) {
2365 msecs_to_jiffies(params
.assoc_value
);
2367 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2368 SPP_SACKDELAY_ENABLE
;
2370 sp
->sackdelay
= params
.assoc_value
;
2372 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2373 SPP_SACKDELAY_ENABLE
;
2378 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2379 SPP_SACKDELAY_DISABLE
;
2382 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2383 SPP_SACKDELAY_DISABLE
;
2387 /* If change is for association, also apply to each transport. */
2389 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2391 if (params
.assoc_value
) {
2393 msecs_to_jiffies(params
.assoc_value
);
2394 trans
->param_flags
=
2395 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2396 SPP_SACKDELAY_ENABLE
;
2398 trans
->param_flags
=
2399 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2400 SPP_SACKDELAY_DISABLE
;
2408 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2410 * Applications can specify protocol parameters for the default association
2411 * initialization. The option name argument to setsockopt() and getsockopt()
2414 * Setting initialization parameters is effective only on an unconnected
2415 * socket (for UDP-style sockets only future associations are effected
2416 * by the change). With TCP-style sockets, this option is inherited by
2417 * sockets derived from a listener socket.
2419 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, int optlen
)
2421 struct sctp_initmsg sinit
;
2422 struct sctp_sock
*sp
= sctp_sk(sk
);
2424 if (optlen
!= sizeof(struct sctp_initmsg
))
2426 if (copy_from_user(&sinit
, optval
, optlen
))
2429 if (sinit
.sinit_num_ostreams
)
2430 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2431 if (sinit
.sinit_max_instreams
)
2432 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2433 if (sinit
.sinit_max_attempts
)
2434 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2435 if (sinit
.sinit_max_init_timeo
)
2436 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2442 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2444 * Applications that wish to use the sendto() system call may wish to
2445 * specify a default set of parameters that would normally be supplied
2446 * through the inclusion of ancillary data. This socket option allows
2447 * such an application to set the default sctp_sndrcvinfo structure.
2448 * The application that wishes to use this socket option simply passes
2449 * in to this call the sctp_sndrcvinfo structure defined in Section
2450 * 5.2.2) The input parameters accepted by this call include
2451 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2452 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2453 * to this call if the caller is using the UDP model.
2455 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2456 char __user
*optval
, int optlen
)
2458 struct sctp_sndrcvinfo info
;
2459 struct sctp_association
*asoc
;
2460 struct sctp_sock
*sp
= sctp_sk(sk
);
2462 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2464 if (copy_from_user(&info
, optval
, optlen
))
2467 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2468 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2472 asoc
->default_stream
= info
.sinfo_stream
;
2473 asoc
->default_flags
= info
.sinfo_flags
;
2474 asoc
->default_ppid
= info
.sinfo_ppid
;
2475 asoc
->default_context
= info
.sinfo_context
;
2476 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2478 sp
->default_stream
= info
.sinfo_stream
;
2479 sp
->default_flags
= info
.sinfo_flags
;
2480 sp
->default_ppid
= info
.sinfo_ppid
;
2481 sp
->default_context
= info
.sinfo_context
;
2482 sp
->default_timetolive
= info
.sinfo_timetolive
;
2488 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2490 * Requests that the local SCTP stack use the enclosed peer address as
2491 * the association primary. The enclosed address must be one of the
2492 * association peer's addresses.
2494 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2497 struct sctp_prim prim
;
2498 struct sctp_transport
*trans
;
2500 if (optlen
!= sizeof(struct sctp_prim
))
2503 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2506 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2510 sctp_assoc_set_primary(trans
->asoc
, trans
);
2516 * 7.1.5 SCTP_NODELAY
2518 * Turn on/off any Nagle-like algorithm. This means that packets are
2519 * generally sent as soon as possible and no unnecessary delays are
2520 * introduced, at the cost of more packets in the network. Expects an
2521 * integer boolean flag.
2523 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2528 if (optlen
< sizeof(int))
2530 if (get_user(val
, (int __user
*)optval
))
2533 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2539 * 7.1.1 SCTP_RTOINFO
2541 * The protocol parameters used to initialize and bound retransmission
2542 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2543 * and modify these parameters.
2544 * All parameters are time values, in milliseconds. A value of 0, when
2545 * modifying the parameters, indicates that the current value should not
2549 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, int optlen
) {
2550 struct sctp_rtoinfo rtoinfo
;
2551 struct sctp_association
*asoc
;
2553 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2556 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2559 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2561 /* Set the values to the specific association */
2562 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2566 if (rtoinfo
.srto_initial
!= 0)
2568 msecs_to_jiffies(rtoinfo
.srto_initial
);
2569 if (rtoinfo
.srto_max
!= 0)
2570 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2571 if (rtoinfo
.srto_min
!= 0)
2572 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2574 /* If there is no association or the association-id = 0
2575 * set the values to the endpoint.
2577 struct sctp_sock
*sp
= sctp_sk(sk
);
2579 if (rtoinfo
.srto_initial
!= 0)
2580 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2581 if (rtoinfo
.srto_max
!= 0)
2582 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2583 if (rtoinfo
.srto_min
!= 0)
2584 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2592 * 7.1.2 SCTP_ASSOCINFO
2594 * This option is used to tune the maximum retransmission attempts
2595 * of the association.
2596 * Returns an error if the new association retransmission value is
2597 * greater than the sum of the retransmission value of the peer.
2598 * See [SCTP] for more information.
2601 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, int optlen
)
2604 struct sctp_assocparams assocparams
;
2605 struct sctp_association
*asoc
;
2607 if (optlen
!= sizeof(struct sctp_assocparams
))
2609 if (copy_from_user(&assocparams
, optval
, optlen
))
2612 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2614 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2617 /* Set the values to the specific association */
2619 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2622 struct sctp_transport
*peer_addr
;
2624 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
2626 path_sum
+= peer_addr
->pathmaxrxt
;
2630 /* Only validate asocmaxrxt if we have more then
2631 * one path/transport. We do this because path
2632 * retransmissions are only counted when we have more
2636 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2639 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2642 if (assocparams
.sasoc_cookie_life
!= 0) {
2643 asoc
->cookie_life
.tv_sec
=
2644 assocparams
.sasoc_cookie_life
/ 1000;
2645 asoc
->cookie_life
.tv_usec
=
2646 (assocparams
.sasoc_cookie_life
% 1000)
2650 /* Set the values to the endpoint */
2651 struct sctp_sock
*sp
= sctp_sk(sk
);
2653 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2654 sp
->assocparams
.sasoc_asocmaxrxt
=
2655 assocparams
.sasoc_asocmaxrxt
;
2656 if (assocparams
.sasoc_cookie_life
!= 0)
2657 sp
->assocparams
.sasoc_cookie_life
=
2658 assocparams
.sasoc_cookie_life
;
2664 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2666 * This socket option is a boolean flag which turns on or off mapped V4
2667 * addresses. If this option is turned on and the socket is type
2668 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2669 * If this option is turned off, then no mapping will be done of V4
2670 * addresses and a user will receive both PF_INET6 and PF_INET type
2671 * addresses on the socket.
2673 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, int optlen
)
2676 struct sctp_sock
*sp
= sctp_sk(sk
);
2678 if (optlen
< sizeof(int))
2680 if (get_user(val
, (int __user
*)optval
))
2691 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2693 * This socket option specifies the maximum size to put in any outgoing
2694 * SCTP chunk. If a message is larger than this size it will be
2695 * fragmented by SCTP into the specified size. Note that the underlying
2696 * SCTP implementation may fragment into smaller sized chunks when the
2697 * PMTU of the underlying association is smaller than the value set by
2700 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, int optlen
)
2702 struct sctp_association
*asoc
;
2703 struct sctp_sock
*sp
= sctp_sk(sk
);
2706 if (optlen
< sizeof(int))
2708 if (get_user(val
, (int __user
*)optval
))
2710 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2712 sp
->user_frag
= val
;
2714 /* Update the frag_point of the existing associations. */
2715 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
2716 asoc
->frag_point
= sctp_frag_point(sp
, asoc
->pathmtu
);
2724 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2726 * Requests that the peer mark the enclosed address as the association
2727 * primary. The enclosed address must be one of the association's
2728 * locally bound addresses. The following structure is used to make a
2729 * set primary request:
2731 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2734 struct sctp_sock
*sp
;
2735 struct sctp_endpoint
*ep
;
2736 struct sctp_association
*asoc
= NULL
;
2737 struct sctp_setpeerprim prim
;
2738 struct sctp_chunk
*chunk
;
2744 if (!sctp_addip_enable
)
2747 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2750 if (copy_from_user(&prim
, optval
, optlen
))
2753 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2757 if (!asoc
->peer
.asconf_capable
)
2760 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2763 if (!sctp_state(asoc
, ESTABLISHED
))
2766 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2767 return -EADDRNOTAVAIL
;
2769 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2770 chunk
= sctp_make_asconf_set_prim(asoc
,
2771 (union sctp_addr
*)&prim
.sspp_addr
);
2775 err
= sctp_send_asconf(asoc
, chunk
);
2777 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2782 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
2785 struct sctp_setadaptation adaptation
;
2787 if (optlen
!= sizeof(struct sctp_setadaptation
))
2789 if (copy_from_user(&adaptation
, optval
, optlen
))
2792 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
2798 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2800 * The context field in the sctp_sndrcvinfo structure is normally only
2801 * used when a failed message is retrieved holding the value that was
2802 * sent down on the actual send call. This option allows the setting of
2803 * a default context on an association basis that will be received on
2804 * reading messages from the peer. This is especially helpful in the
2805 * one-2-many model for an application to keep some reference to an
2806 * internal state machine that is processing messages on the
2807 * association. Note that the setting of this value only effects
2808 * received messages from the peer and does not effect the value that is
2809 * saved with outbound messages.
2811 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
2814 struct sctp_assoc_value params
;
2815 struct sctp_sock
*sp
;
2816 struct sctp_association
*asoc
;
2818 if (optlen
!= sizeof(struct sctp_assoc_value
))
2820 if (copy_from_user(¶ms
, optval
, optlen
))
2825 if (params
.assoc_id
!= 0) {
2826 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2829 asoc
->default_rcv_context
= params
.assoc_value
;
2831 sp
->default_rcv_context
= params
.assoc_value
;
2838 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
2840 * This options will at a minimum specify if the implementation is doing
2841 * fragmented interleave. Fragmented interleave, for a one to many
2842 * socket, is when subsequent calls to receive a message may return
2843 * parts of messages from different associations. Some implementations
2844 * may allow you to turn this value on or off. If so, when turned off,
2845 * no fragment interleave will occur (which will cause a head of line
2846 * blocking amongst multiple associations sharing the same one to many
2847 * socket). When this option is turned on, then each receive call may
2848 * come from a different association (thus the user must receive data
2849 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
2850 * association each receive belongs to.
2852 * This option takes a boolean value. A non-zero value indicates that
2853 * fragmented interleave is on. A value of zero indicates that
2854 * fragmented interleave is off.
2856 * Note that it is important that an implementation that allows this
2857 * option to be turned on, have it off by default. Otherwise an unaware
2858 * application using the one to many model may become confused and act
2861 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
2862 char __user
*optval
,
2867 if (optlen
!= sizeof(int))
2869 if (get_user(val
, (int __user
*)optval
))
2872 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
2878 * 7.1.25. Set or Get the sctp partial delivery point
2879 * (SCTP_PARTIAL_DELIVERY_POINT)
2880 * This option will set or get the SCTP partial delivery point. This
2881 * point is the size of a message where the partial delivery API will be
2882 * invoked to help free up rwnd space for the peer. Setting this to a
2883 * lower value will cause partial delivery's to happen more often. The
2884 * calls argument is an integer that sets or gets the partial delivery
2887 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
2888 char __user
*optval
,
2893 if (optlen
!= sizeof(u32
))
2895 if (get_user(val
, (int __user
*)optval
))
2898 sctp_sk(sk
)->pd_point
= val
;
2900 return 0; /* is this the right error code? */
2904 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
2906 * This option will allow a user to change the maximum burst of packets
2907 * that can be emitted by this association. Note that the default value
2908 * is 4, and some implementations may restrict this setting so that it
2909 * can only be lowered.
2911 * NOTE: This text doesn't seem right. Do this on a socket basis with
2912 * future associations inheriting the socket value.
2914 static int sctp_setsockopt_maxburst(struct sock
*sk
,
2915 char __user
*optval
,
2918 struct sctp_assoc_value params
;
2919 struct sctp_sock
*sp
;
2920 struct sctp_association
*asoc
;
2924 if (optlen
< sizeof(int))
2927 if (optlen
== sizeof(int)) {
2929 "SCTP: Use of int in max_burst socket option deprecated\n");
2931 "SCTP: Use struct sctp_assoc_value instead\n");
2932 if (copy_from_user(&val
, optval
, optlen
))
2934 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2935 if (copy_from_user(¶ms
, optval
, optlen
))
2937 val
= params
.assoc_value
;
2938 assoc_id
= params
.assoc_id
;
2944 if (assoc_id
!= 0) {
2945 asoc
= sctp_id2assoc(sk
, assoc_id
);
2948 asoc
->max_burst
= val
;
2950 sp
->max_burst
= val
;
2956 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
2958 * This set option adds a chunk type that the user is requesting to be
2959 * received only in an authenticated way. Changes to the list of chunks
2960 * will only effect future associations on the socket.
2962 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
2963 char __user
*optval
,
2966 struct sctp_authchunk val
;
2968 if (optlen
!= sizeof(struct sctp_authchunk
))
2970 if (copy_from_user(&val
, optval
, optlen
))
2973 switch (val
.sauth_chunk
) {
2975 case SCTP_CID_INIT_ACK
:
2976 case SCTP_CID_SHUTDOWN_COMPLETE
:
2981 /* add this chunk id to the endpoint */
2982 return sctp_auth_ep_add_chunkid(sctp_sk(sk
)->ep
, val
.sauth_chunk
);
2986 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
2988 * This option gets or sets the list of HMAC algorithms that the local
2989 * endpoint requires the peer to use.
2991 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
2992 char __user
*optval
,
2995 struct sctp_hmacalgo
*hmacs
;
2998 if (optlen
< sizeof(struct sctp_hmacalgo
))
3001 hmacs
= kmalloc(optlen
, GFP_KERNEL
);
3005 if (copy_from_user(hmacs
, optval
, optlen
)) {
3010 if (hmacs
->shmac_num_idents
== 0 ||
3011 hmacs
->shmac_num_idents
> SCTP_AUTH_NUM_HMACS
) {
3016 err
= sctp_auth_ep_set_hmacs(sctp_sk(sk
)->ep
, hmacs
);
3023 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3025 * This option will set a shared secret key which is used to build an
3026 * association shared key.
3028 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3029 char __user
*optval
,
3032 struct sctp_authkey
*authkey
;
3033 struct sctp_association
*asoc
;
3036 if (optlen
<= sizeof(struct sctp_authkey
))
3039 authkey
= kmalloc(optlen
, GFP_KERNEL
);
3043 if (copy_from_user(authkey
, optval
, optlen
)) {
3048 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3049 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3054 ret
= sctp_auth_set_key(sctp_sk(sk
)->ep
, asoc
, authkey
);
3061 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3063 * This option will get or set the active shared key to be used to build
3064 * the association shared key.
3066 static int sctp_setsockopt_active_key(struct sock
*sk
,
3067 char __user
*optval
,
3070 struct sctp_authkeyid val
;
3071 struct sctp_association
*asoc
;
3073 if (optlen
!= sizeof(struct sctp_authkeyid
))
3075 if (copy_from_user(&val
, optval
, optlen
))
3078 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3079 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3082 return sctp_auth_set_active_key(sctp_sk(sk
)->ep
, asoc
,
3083 val
.scact_keynumber
);
3087 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3089 * This set option will delete a shared secret key from use.
3091 static int sctp_setsockopt_del_key(struct sock
*sk
,
3092 char __user
*optval
,
3095 struct sctp_authkeyid val
;
3096 struct sctp_association
*asoc
;
3098 if (optlen
!= sizeof(struct sctp_authkeyid
))
3100 if (copy_from_user(&val
, optval
, optlen
))
3103 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3104 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3107 return sctp_auth_del_key_id(sctp_sk(sk
)->ep
, asoc
,
3108 val
.scact_keynumber
);
3113 /* API 6.2 setsockopt(), getsockopt()
3115 * Applications use setsockopt() and getsockopt() to set or retrieve
3116 * socket options. Socket options are used to change the default
3117 * behavior of sockets calls. They are described in Section 7.
3121 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3122 * int __user *optlen);
3123 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3126 * sd - the socket descript.
3127 * level - set to IPPROTO_SCTP for all SCTP options.
3128 * optname - the option name.
3129 * optval - the buffer to store the value of the option.
3130 * optlen - the size of the buffer.
3132 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3133 char __user
*optval
, int optlen
)
3137 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3140 /* I can hardly begin to describe how wrong this is. This is
3141 * so broken as to be worse than useless. The API draft
3142 * REALLY is NOT helpful here... I am not convinced that the
3143 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3144 * are at all well-founded.
3146 if (level
!= SOL_SCTP
) {
3147 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3148 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3155 case SCTP_SOCKOPT_BINDX_ADD
:
3156 /* 'optlen' is the size of the addresses buffer. */
3157 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3158 optlen
, SCTP_BINDX_ADD_ADDR
);
3161 case SCTP_SOCKOPT_BINDX_REM
:
3162 /* 'optlen' is the size of the addresses buffer. */
3163 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3164 optlen
, SCTP_BINDX_REM_ADDR
);
3167 case SCTP_SOCKOPT_CONNECTX
:
3168 /* 'optlen' is the size of the addresses buffer. */
3169 retval
= sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)optval
,
3173 case SCTP_DISABLE_FRAGMENTS
:
3174 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3178 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3181 case SCTP_AUTOCLOSE
:
3182 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3185 case SCTP_PEER_ADDR_PARAMS
:
3186 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3189 case SCTP_DELAYED_ACK_TIME
:
3190 retval
= sctp_setsockopt_delayed_ack_time(sk
, optval
, optlen
);
3192 case SCTP_PARTIAL_DELIVERY_POINT
:
3193 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3197 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3199 case SCTP_DEFAULT_SEND_PARAM
:
3200 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3203 case SCTP_PRIMARY_ADDR
:
3204 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3206 case SCTP_SET_PEER_PRIMARY_ADDR
:
3207 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3210 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3213 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3215 case SCTP_ASSOCINFO
:
3216 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3218 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3219 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3222 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3224 case SCTP_ADAPTATION_LAYER
:
3225 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3228 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3230 case SCTP_FRAGMENT_INTERLEAVE
:
3231 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3233 case SCTP_MAX_BURST
:
3234 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3236 case SCTP_AUTH_CHUNK
:
3237 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3239 case SCTP_HMAC_IDENT
:
3240 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3243 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3245 case SCTP_AUTH_ACTIVE_KEY
:
3246 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3248 case SCTP_AUTH_DELETE_KEY
:
3249 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3252 retval
= -ENOPROTOOPT
;
3256 sctp_release_sock(sk
);
3262 /* API 3.1.6 connect() - UDP Style Syntax
3264 * An application may use the connect() call in the UDP model to initiate an
3265 * association without sending data.
3269 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3271 * sd: the socket descriptor to have a new association added to.
3273 * nam: the address structure (either struct sockaddr_in or struct
3274 * sockaddr_in6 defined in RFC2553 [7]).
3276 * len: the size of the address.
3278 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3286 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3287 __func__
, sk
, addr
, addr_len
);
3289 /* Validate addr_len before calling common connect/connectx routine. */
3290 af
= sctp_get_af_specific(addr
->sa_family
);
3291 if (!af
|| addr_len
< af
->sockaddr_len
) {
3294 /* Pass correct addr len to common routine (so it knows there
3295 * is only one address being passed.
3297 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
);
3300 sctp_release_sock(sk
);
3304 /* FIXME: Write comments. */
3305 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
3307 return -EOPNOTSUPP
; /* STUB */
3310 /* 4.1.4 accept() - TCP Style Syntax
3312 * Applications use accept() call to remove an established SCTP
3313 * association from the accept queue of the endpoint. A new socket
3314 * descriptor will be returned from accept() to represent the newly
3315 * formed association.
3317 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3319 struct sctp_sock
*sp
;
3320 struct sctp_endpoint
*ep
;
3321 struct sock
*newsk
= NULL
;
3322 struct sctp_association
*asoc
;
3331 if (!sctp_style(sk
, TCP
)) {
3332 error
= -EOPNOTSUPP
;
3336 if (!sctp_sstate(sk
, LISTENING
)) {
3341 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3343 error
= sctp_wait_for_accept(sk
, timeo
);
3347 /* We treat the list of associations on the endpoint as the accept
3348 * queue and pick the first association on the list.
3350 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3352 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3358 /* Populate the fields of the newsk from the oldsk and migrate the
3359 * asoc to the newsk.
3361 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3364 sctp_release_sock(sk
);
3369 /* The SCTP ioctl handler. */
3370 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3372 return -ENOIOCTLCMD
;
3375 /* This is the function which gets called during socket creation to
3376 * initialized the SCTP-specific portion of the sock.
3377 * The sock structure should already be zero-filled memory.
3379 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
3381 struct sctp_endpoint
*ep
;
3382 struct sctp_sock
*sp
;
3384 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3388 /* Initialize the SCTP per socket area. */
3389 switch (sk
->sk_type
) {
3390 case SOCK_SEQPACKET
:
3391 sp
->type
= SCTP_SOCKET_UDP
;
3394 sp
->type
= SCTP_SOCKET_TCP
;
3397 return -ESOCKTNOSUPPORT
;
3400 /* Initialize default send parameters. These parameters can be
3401 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3403 sp
->default_stream
= 0;
3404 sp
->default_ppid
= 0;
3405 sp
->default_flags
= 0;
3406 sp
->default_context
= 0;
3407 sp
->default_timetolive
= 0;
3409 sp
->default_rcv_context
= 0;
3410 sp
->max_burst
= sctp_max_burst
;
3412 /* Initialize default setup parameters. These parameters
3413 * can be modified with the SCTP_INITMSG socket option or
3414 * overridden by the SCTP_INIT CMSG.
3416 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3417 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3418 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3419 sp
->initmsg
.sinit_max_init_timeo
= sctp_rto_max
;
3421 /* Initialize default RTO related parameters. These parameters can
3422 * be modified for with the SCTP_RTOINFO socket option.
3424 sp
->rtoinfo
.srto_initial
= sctp_rto_initial
;
3425 sp
->rtoinfo
.srto_max
= sctp_rto_max
;
3426 sp
->rtoinfo
.srto_min
= sctp_rto_min
;
3428 /* Initialize default association related parameters. These parameters
3429 * can be modified with the SCTP_ASSOCINFO socket option.
3431 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3432 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3433 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3434 sp
->assocparams
.sasoc_local_rwnd
= 0;
3435 sp
->assocparams
.sasoc_cookie_life
= sctp_valid_cookie_life
;
3437 /* Initialize default event subscriptions. By default, all the
3440 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3442 /* Default Peer Address Parameters. These defaults can
3443 * be modified via SCTP_PEER_ADDR_PARAMS
3445 sp
->hbinterval
= sctp_hb_interval
;
3446 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3447 sp
->pathmtu
= 0; // allow default discovery
3448 sp
->sackdelay
= sctp_sack_timeout
;
3449 sp
->param_flags
= SPP_HB_ENABLE
|
3451 SPP_SACKDELAY_ENABLE
;
3453 /* If enabled no SCTP message fragmentation will be performed.
3454 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3456 sp
->disable_fragments
= 0;
3458 /* Enable Nagle algorithm by default. */
3461 /* Enable by default. */
3464 /* Auto-close idle associations after the configured
3465 * number of seconds. A value of 0 disables this
3466 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3467 * for UDP-style sockets only.
3471 /* User specified fragmentation limit. */
3474 sp
->adaptation_ind
= 0;
3476 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3478 /* Control variables for partial data delivery. */
3479 atomic_set(&sp
->pd_mode
, 0);
3480 skb_queue_head_init(&sp
->pd_lobby
);
3481 sp
->frag_interleave
= 0;
3483 /* Create a per socket endpoint structure. Even if we
3484 * change the data structure relationships, this may still
3485 * be useful for storing pre-connect address information.
3487 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3494 SCTP_DBG_OBJCNT_INC(sock
);
3495 atomic_inc(&sctp_sockets_allocated
);
3499 /* Cleanup any SCTP per socket resources. */
3500 SCTP_STATIC
int sctp_destroy_sock(struct sock
*sk
)
3502 struct sctp_endpoint
*ep
;
3504 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3506 /* Release our hold on the endpoint. */
3507 ep
= sctp_sk(sk
)->ep
;
3508 sctp_endpoint_free(ep
);
3509 atomic_dec(&sctp_sockets_allocated
);
3513 /* API 4.1.7 shutdown() - TCP Style Syntax
3514 * int shutdown(int socket, int how);
3516 * sd - the socket descriptor of the association to be closed.
3517 * how - Specifies the type of shutdown. The values are
3520 * Disables further receive operations. No SCTP
3521 * protocol action is taken.
3523 * Disables further send operations, and initiates
3524 * the SCTP shutdown sequence.
3526 * Disables further send and receive operations
3527 * and initiates the SCTP shutdown sequence.
3529 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3531 struct sctp_endpoint
*ep
;
3532 struct sctp_association
*asoc
;
3534 if (!sctp_style(sk
, TCP
))
3537 if (how
& SEND_SHUTDOWN
) {
3538 ep
= sctp_sk(sk
)->ep
;
3539 if (!list_empty(&ep
->asocs
)) {
3540 asoc
= list_entry(ep
->asocs
.next
,
3541 struct sctp_association
, asocs
);
3542 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3547 /* 7.2.1 Association Status (SCTP_STATUS)
3549 * Applications can retrieve current status information about an
3550 * association, including association state, peer receiver window size,
3551 * number of unacked data chunks, and number of data chunks pending
3552 * receipt. This information is read-only.
3554 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3555 char __user
*optval
,
3558 struct sctp_status status
;
3559 struct sctp_association
*asoc
= NULL
;
3560 struct sctp_transport
*transport
;
3561 sctp_assoc_t associd
;
3564 if (len
< sizeof(status
)) {
3569 len
= sizeof(status
);
3570 if (copy_from_user(&status
, optval
, len
)) {
3575 associd
= status
.sstat_assoc_id
;
3576 asoc
= sctp_id2assoc(sk
, associd
);
3582 transport
= asoc
->peer
.primary_path
;
3584 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3585 status
.sstat_state
= asoc
->state
;
3586 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3587 status
.sstat_unackdata
= asoc
->unack_data
;
3589 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3590 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3591 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3592 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3593 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3594 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
3595 transport
->af_specific
->sockaddr_len
);
3596 /* Map ipv4 address into v4-mapped-on-v6 address. */
3597 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3598 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3599 status
.sstat_primary
.spinfo_state
= transport
->state
;
3600 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3601 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3602 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3603 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3605 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3606 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3608 if (put_user(len
, optlen
)) {
3613 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3614 len
, status
.sstat_state
, status
.sstat_rwnd
,
3615 status
.sstat_assoc_id
);
3617 if (copy_to_user(optval
, &status
, len
)) {
3627 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3629 * Applications can retrieve information about a specific peer address
3630 * of an association, including its reachability state, congestion
3631 * window, and retransmission timer values. This information is
3634 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3635 char __user
*optval
,
3638 struct sctp_paddrinfo pinfo
;
3639 struct sctp_transport
*transport
;
3642 if (len
< sizeof(pinfo
)) {
3647 len
= sizeof(pinfo
);
3648 if (copy_from_user(&pinfo
, optval
, len
)) {
3653 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3654 pinfo
.spinfo_assoc_id
);
3658 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3659 pinfo
.spinfo_state
= transport
->state
;
3660 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3661 pinfo
.spinfo_srtt
= transport
->srtt
;
3662 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3663 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3665 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3666 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3668 if (put_user(len
, optlen
)) {
3673 if (copy_to_user(optval
, &pinfo
, len
)) {
3682 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3684 * This option is a on/off flag. If enabled no SCTP message
3685 * fragmentation will be performed. Instead if a message being sent
3686 * exceeds the current PMTU size, the message will NOT be sent and
3687 * instead a error will be indicated to the user.
3689 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3690 char __user
*optval
, int __user
*optlen
)
3694 if (len
< sizeof(int))
3698 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3699 if (put_user(len
, optlen
))
3701 if (copy_to_user(optval
, &val
, len
))
3706 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3708 * This socket option is used to specify various notifications and
3709 * ancillary data the user wishes to receive.
3711 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
3714 if (len
< sizeof(struct sctp_event_subscribe
))
3716 len
= sizeof(struct sctp_event_subscribe
);
3717 if (put_user(len
, optlen
))
3719 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
3724 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3726 * This socket option is applicable to the UDP-style socket only. When
3727 * set it will cause associations that are idle for more than the
3728 * specified number of seconds to automatically close. An association
3729 * being idle is defined an association that has NOT sent or received
3730 * user data. The special value of '0' indicates that no automatic
3731 * close of any associations should be performed. The option expects an
3732 * integer defining the number of seconds of idle time before an
3733 * association is closed.
3735 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3737 /* Applicable to UDP-style socket only */
3738 if (sctp_style(sk
, TCP
))
3740 if (len
< sizeof(int))
3743 if (put_user(len
, optlen
))
3745 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
3750 /* Helper routine to branch off an association to a new socket. */
3751 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3752 struct socket
**sockp
)
3754 struct sock
*sk
= asoc
->base
.sk
;
3755 struct socket
*sock
;
3756 struct inet_sock
*inetsk
;
3760 /* An association cannot be branched off from an already peeled-off
3761 * socket, nor is this supported for tcp style sockets.
3763 if (!sctp_style(sk
, UDP
))
3766 /* Create a new socket. */
3767 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
3771 /* Populate the fields of the newsk from the oldsk and migrate the
3772 * asoc to the newsk.
3774 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
3776 /* Make peeled-off sockets more like 1-1 accepted sockets.
3777 * Set the daddr and initialize id to something more random
3779 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
3780 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
3781 inetsk
= inet_sk(sock
->sk
);
3782 inetsk
->id
= asoc
->next_tsn
^ jiffies
;
3789 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3791 sctp_peeloff_arg_t peeloff
;
3792 struct socket
*newsock
;
3794 struct sctp_association
*asoc
;
3796 if (len
< sizeof(sctp_peeloff_arg_t
))
3798 len
= sizeof(sctp_peeloff_arg_t
);
3799 if (copy_from_user(&peeloff
, optval
, len
))
3802 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
3808 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__
, sk
, asoc
);
3810 retval
= sctp_do_peeloff(asoc
, &newsock
);
3814 /* Map the socket to an unused fd that can be returned to the user. */
3815 retval
= sock_map_fd(newsock
);
3817 sock_release(newsock
);
3821 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3822 __func__
, sk
, asoc
, newsock
->sk
, retval
);
3824 /* Return the fd mapped to the new socket. */
3825 peeloff
.sd
= retval
;
3826 if (put_user(len
, optlen
))
3828 if (copy_to_user(optval
, &peeloff
, len
))
3835 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3837 * Applications can enable or disable heartbeats for any peer address of
3838 * an association, modify an address's heartbeat interval, force a
3839 * heartbeat to be sent immediately, and adjust the address's maximum
3840 * number of retransmissions sent before an address is considered
3841 * unreachable. The following structure is used to access and modify an
3842 * address's parameters:
3844 * struct sctp_paddrparams {
3845 * sctp_assoc_t spp_assoc_id;
3846 * struct sockaddr_storage spp_address;
3847 * uint32_t spp_hbinterval;
3848 * uint16_t spp_pathmaxrxt;
3849 * uint32_t spp_pathmtu;
3850 * uint32_t spp_sackdelay;
3851 * uint32_t spp_flags;
3854 * spp_assoc_id - (one-to-many style socket) This is filled in the
3855 * application, and identifies the association for
3857 * spp_address - This specifies which address is of interest.
3858 * spp_hbinterval - This contains the value of the heartbeat interval,
3859 * in milliseconds. If a value of zero
3860 * is present in this field then no changes are to
3861 * be made to this parameter.
3862 * spp_pathmaxrxt - This contains the maximum number of
3863 * retransmissions before this address shall be
3864 * considered unreachable. If a value of zero
3865 * is present in this field then no changes are to
3866 * be made to this parameter.
3867 * spp_pathmtu - When Path MTU discovery is disabled the value
3868 * specified here will be the "fixed" path mtu.
3869 * Note that if the spp_address field is empty
3870 * then all associations on this address will
3871 * have this fixed path mtu set upon them.
3873 * spp_sackdelay - When delayed sack is enabled, this value specifies
3874 * the number of milliseconds that sacks will be delayed
3875 * for. This value will apply to all addresses of an
3876 * association if the spp_address field is empty. Note
3877 * also, that if delayed sack is enabled and this
3878 * value is set to 0, no change is made to the last
3879 * recorded delayed sack timer value.
3881 * spp_flags - These flags are used to control various features
3882 * on an association. The flag field may contain
3883 * zero or more of the following options.
3885 * SPP_HB_ENABLE - Enable heartbeats on the
3886 * specified address. Note that if the address
3887 * field is empty all addresses for the association
3888 * have heartbeats enabled upon them.
3890 * SPP_HB_DISABLE - Disable heartbeats on the
3891 * speicifed address. Note that if the address
3892 * field is empty all addresses for the association
3893 * will have their heartbeats disabled. Note also
3894 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
3895 * mutually exclusive, only one of these two should
3896 * be specified. Enabling both fields will have
3897 * undetermined results.
3899 * SPP_HB_DEMAND - Request a user initiated heartbeat
3900 * to be made immediately.
3902 * SPP_PMTUD_ENABLE - This field will enable PMTU
3903 * discovery upon the specified address. Note that
3904 * if the address feild is empty then all addresses
3905 * on the association are effected.
3907 * SPP_PMTUD_DISABLE - This field will disable PMTU
3908 * discovery upon the specified address. Note that
3909 * if the address feild is empty then all addresses
3910 * on the association are effected. Not also that
3911 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
3912 * exclusive. Enabling both will have undetermined
3915 * SPP_SACKDELAY_ENABLE - Setting this flag turns
3916 * on delayed sack. The time specified in spp_sackdelay
3917 * is used to specify the sack delay for this address. Note
3918 * that if spp_address is empty then all addresses will
3919 * enable delayed sack and take on the sack delay
3920 * value specified in spp_sackdelay.
3921 * SPP_SACKDELAY_DISABLE - Setting this flag turns
3922 * off delayed sack. If the spp_address field is blank then
3923 * delayed sack is disabled for the entire association. Note
3924 * also that this field is mutually exclusive to
3925 * SPP_SACKDELAY_ENABLE, setting both will have undefined
3928 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
3929 char __user
*optval
, int __user
*optlen
)
3931 struct sctp_paddrparams params
;
3932 struct sctp_transport
*trans
= NULL
;
3933 struct sctp_association
*asoc
= NULL
;
3934 struct sctp_sock
*sp
= sctp_sk(sk
);
3936 if (len
< sizeof(struct sctp_paddrparams
))
3938 len
= sizeof(struct sctp_paddrparams
);
3939 if (copy_from_user(¶ms
, optval
, len
))
3942 /* If an address other than INADDR_ANY is specified, and
3943 * no transport is found, then the request is invalid.
3945 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
3946 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
3947 params
.spp_assoc_id
);
3949 SCTP_DEBUG_PRINTK("Failed no transport\n");
3954 /* Get association, if assoc_id != 0 and the socket is a one
3955 * to many style socket, and an association was not found, then
3956 * the id was invalid.
3958 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
3959 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
3960 SCTP_DEBUG_PRINTK("Failed no association\n");
3965 /* Fetch transport values. */
3966 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
3967 params
.spp_pathmtu
= trans
->pathmtu
;
3968 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
3969 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
3971 /*draft-11 doesn't say what to return in spp_flags*/
3972 params
.spp_flags
= trans
->param_flags
;
3974 /* Fetch association values. */
3975 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
3976 params
.spp_pathmtu
= asoc
->pathmtu
;
3977 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
3978 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
3980 /*draft-11 doesn't say what to return in spp_flags*/
3981 params
.spp_flags
= asoc
->param_flags
;
3983 /* Fetch socket values. */
3984 params
.spp_hbinterval
= sp
->hbinterval
;
3985 params
.spp_pathmtu
= sp
->pathmtu
;
3986 params
.spp_sackdelay
= sp
->sackdelay
;
3987 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
3989 /*draft-11 doesn't say what to return in spp_flags*/
3990 params
.spp_flags
= sp
->param_flags
;
3993 if (copy_to_user(optval
, ¶ms
, len
))
3996 if (put_user(len
, optlen
))
4002 /* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
4004 * This options will get or set the delayed ack timer. The time is set
4005 * in milliseconds. If the assoc_id is 0, then this sets or gets the
4006 * endpoints default delayed ack timer value. If the assoc_id field is
4007 * non-zero, then the set or get effects the specified association.
4009 * struct sctp_assoc_value {
4010 * sctp_assoc_t assoc_id;
4011 * uint32_t assoc_value;
4014 * assoc_id - This parameter, indicates which association the
4015 * user is preforming an action upon. Note that if
4016 * this field's value is zero then the endpoints
4017 * default value is changed (effecting future
4018 * associations only).
4020 * assoc_value - This parameter contains the number of milliseconds
4021 * that the user is requesting the delayed ACK timer
4022 * be set to. Note that this value is defined in
4023 * the standard to be between 200 and 500 milliseconds.
4025 * Note: a value of zero will leave the value alone,
4026 * but disable SACK delay. A non-zero value will also
4027 * enable SACK delay.
4029 static int sctp_getsockopt_delayed_ack_time(struct sock
*sk
, int len
,
4030 char __user
*optval
,
4033 struct sctp_assoc_value params
;
4034 struct sctp_association
*asoc
= NULL
;
4035 struct sctp_sock
*sp
= sctp_sk(sk
);
4037 if (len
< sizeof(struct sctp_assoc_value
))
4040 len
= sizeof(struct sctp_assoc_value
);
4042 if (copy_from_user(¶ms
, optval
, len
))
4045 /* Get association, if assoc_id != 0 and the socket is a one
4046 * to many style socket, and an association was not found, then
4047 * the id was invalid.
4049 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4050 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
4054 /* Fetch association values. */
4055 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
)
4056 params
.assoc_value
= jiffies_to_msecs(
4059 params
.assoc_value
= 0;
4061 /* Fetch socket values. */
4062 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
)
4063 params
.assoc_value
= sp
->sackdelay
;
4065 params
.assoc_value
= 0;
4068 if (copy_to_user(optval
, ¶ms
, len
))
4071 if (put_user(len
, optlen
))
4077 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4079 * Applications can specify protocol parameters for the default association
4080 * initialization. The option name argument to setsockopt() and getsockopt()
4083 * Setting initialization parameters is effective only on an unconnected
4084 * socket (for UDP-style sockets only future associations are effected
4085 * by the change). With TCP-style sockets, this option is inherited by
4086 * sockets derived from a listener socket.
4088 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4090 if (len
< sizeof(struct sctp_initmsg
))
4092 len
= sizeof(struct sctp_initmsg
);
4093 if (put_user(len
, optlen
))
4095 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
4100 static int sctp_getsockopt_peer_addrs_num_old(struct sock
*sk
, int len
,
4101 char __user
*optval
,
4105 struct sctp_association
*asoc
;
4106 struct list_head
*pos
;
4109 if (len
< sizeof(sctp_assoc_t
))
4112 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
4115 /* For UDP-style sockets, id specifies the association to query. */
4116 asoc
= sctp_id2assoc(sk
, id
);
4120 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4128 * Old API for getting list of peer addresses. Does not work for 32-bit
4129 * programs running on a 64-bit kernel
4131 static int sctp_getsockopt_peer_addrs_old(struct sock
*sk
, int len
,
4132 char __user
*optval
,
4135 struct sctp_association
*asoc
;
4137 struct sctp_getaddrs_old getaddrs
;
4138 struct sctp_transport
*from
;
4140 union sctp_addr temp
;
4141 struct sctp_sock
*sp
= sctp_sk(sk
);
4144 if (len
< sizeof(struct sctp_getaddrs_old
))
4147 len
= sizeof(struct sctp_getaddrs_old
);
4149 if (copy_from_user(&getaddrs
, optval
, len
))
4152 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
4154 /* For UDP-style sockets, id specifies the association to query. */
4155 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4159 to
= (void __user
*)getaddrs
.addrs
;
4160 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
4162 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4163 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4164 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
4165 if (copy_to_user(to
, &temp
, addrlen
))
4169 if (cnt
>= getaddrs
.addr_num
) break;
4171 getaddrs
.addr_num
= cnt
;
4172 if (put_user(len
, optlen
))
4174 if (copy_to_user(optval
, &getaddrs
, len
))
4180 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4181 char __user
*optval
, int __user
*optlen
)
4183 struct sctp_association
*asoc
;
4185 struct sctp_getaddrs getaddrs
;
4186 struct sctp_transport
*from
;
4188 union sctp_addr temp
;
4189 struct sctp_sock
*sp
= sctp_sk(sk
);
4194 if (len
< sizeof(struct sctp_getaddrs
))
4197 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4200 /* For UDP-style sockets, id specifies the association to query. */
4201 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4205 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4206 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4208 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
4210 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4211 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4212 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
4213 if (space_left
< addrlen
)
4215 if (copy_to_user(to
, &temp
, addrlen
))
4219 space_left
-= addrlen
;
4222 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4224 bytes_copied
= ((char __user
*)to
) - optval
;
4225 if (put_user(bytes_copied
, optlen
))
4231 static int sctp_getsockopt_local_addrs_num_old(struct sock
*sk
, int len
,
4232 char __user
*optval
,
4236 struct sctp_bind_addr
*bp
;
4237 struct sctp_association
*asoc
;
4238 struct sctp_sockaddr_entry
*addr
;
4241 if (len
< sizeof(sctp_assoc_t
))
4244 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
4248 * For UDP-style sockets, id specifies the association to query.
4249 * If the id field is set to the value '0' then the locally bound
4250 * addresses are returned without regard to any particular
4254 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4256 asoc
= sctp_id2assoc(sk
, id
);
4259 bp
= &asoc
->base
.bind_addr
;
4262 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
4263 * addresses from the global local address list.
4265 if (sctp_list_single_entry(&bp
->address_list
)) {
4266 addr
= list_entry(bp
->address_list
.next
,
4267 struct sctp_sockaddr_entry
, list
);
4268 if (sctp_is_any(&addr
->a
)) {
4270 list_for_each_entry_rcu(addr
,
4271 &sctp_local_addr_list
, list
) {
4275 if ((PF_INET
== sk
->sk_family
) &&
4276 (AF_INET6
== addr
->a
.sa
.sa_family
))
4288 /* Protection on the bound address list is not needed,
4289 * since in the socket option context we hold the socket lock,
4290 * so there is no way that the bound address list can change.
4292 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4299 /* Helper function that copies local addresses to user and returns the number
4300 * of addresses copied.
4302 static int sctp_copy_laddrs_old(struct sock
*sk
, __u16 port
,
4303 int max_addrs
, void *to
,
4306 struct sctp_sockaddr_entry
*addr
;
4307 union sctp_addr temp
;
4312 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
4316 if ((PF_INET
== sk
->sk_family
) &&
4317 (AF_INET6
== addr
->a
.sa
.sa_family
))
4319 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4320 if (!temp
.v4
.sin_port
)
4321 temp
.v4
.sin_port
= htons(port
);
4323 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4325 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4326 memcpy(to
, &temp
, addrlen
);
4329 *bytes_copied
+= addrlen
;
4331 if (cnt
>= max_addrs
) break;
4338 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4339 size_t space_left
, int *bytes_copied
)
4341 struct sctp_sockaddr_entry
*addr
;
4342 union sctp_addr temp
;
4347 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
4351 if ((PF_INET
== sk
->sk_family
) &&
4352 (AF_INET6
== addr
->a
.sa
.sa_family
))
4354 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4355 if (!temp
.v4
.sin_port
)
4356 temp
.v4
.sin_port
= htons(port
);
4358 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4360 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4361 if (space_left
< addrlen
) {
4365 memcpy(to
, &temp
, addrlen
);
4369 space_left
-= addrlen
;
4370 *bytes_copied
+= addrlen
;
4377 /* Old API for getting list of local addresses. Does not work for 32-bit
4378 * programs running on a 64-bit kernel
4380 static int sctp_getsockopt_local_addrs_old(struct sock
*sk
, int len
,
4381 char __user
*optval
, int __user
*optlen
)
4383 struct sctp_bind_addr
*bp
;
4384 struct sctp_association
*asoc
;
4386 struct sctp_getaddrs_old getaddrs
;
4387 struct sctp_sockaddr_entry
*addr
;
4389 union sctp_addr temp
;
4390 struct sctp_sock
*sp
= sctp_sk(sk
);
4395 int bytes_copied
= 0;
4397 if (len
< sizeof(struct sctp_getaddrs_old
))
4400 len
= sizeof(struct sctp_getaddrs_old
);
4401 if (copy_from_user(&getaddrs
, optval
, len
))
4404 if (getaddrs
.addr_num
<= 0 ||
4405 getaddrs
.addr_num
>= (INT_MAX
/ sizeof(union sctp_addr
)))
4408 * For UDP-style sockets, id specifies the association to query.
4409 * If the id field is set to the value '0' then the locally bound
4410 * addresses are returned without regard to any particular
4413 if (0 == getaddrs
.assoc_id
) {
4414 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4416 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4419 bp
= &asoc
->base
.bind_addr
;
4422 to
= getaddrs
.addrs
;
4424 /* Allocate space for a local instance of packed array to hold all
4425 * the data. We store addresses here first and then put write them
4426 * to the user in one shot.
4428 addrs
= kmalloc(sizeof(union sctp_addr
) * getaddrs
.addr_num
,
4433 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4434 * addresses from the global local address list.
4436 if (sctp_list_single_entry(&bp
->address_list
)) {
4437 addr
= list_entry(bp
->address_list
.next
,
4438 struct sctp_sockaddr_entry
, list
);
4439 if (sctp_is_any(&addr
->a
)) {
4440 cnt
= sctp_copy_laddrs_old(sk
, bp
->port
,
4442 addrs
, &bytes_copied
);
4448 /* Protection on the bound address list is not needed since
4449 * in the socket option context we hold a socket lock and
4450 * thus the bound address list can't change.
4452 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4453 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4454 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4455 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4456 memcpy(buf
, &temp
, addrlen
);
4458 bytes_copied
+= addrlen
;
4460 if (cnt
>= getaddrs
.addr_num
) break;
4464 /* copy the entire address list into the user provided space */
4465 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4470 /* copy the leading structure back to user */
4471 getaddrs
.addr_num
= cnt
;
4472 if (copy_to_user(optval
, &getaddrs
, len
))
4480 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4481 char __user
*optval
, int __user
*optlen
)
4483 struct sctp_bind_addr
*bp
;
4484 struct sctp_association
*asoc
;
4486 struct sctp_getaddrs getaddrs
;
4487 struct sctp_sockaddr_entry
*addr
;
4489 union sctp_addr temp
;
4490 struct sctp_sock
*sp
= sctp_sk(sk
);
4494 int bytes_copied
= 0;
4498 if (len
< sizeof(struct sctp_getaddrs
))
4501 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4505 * For UDP-style sockets, id specifies the association to query.
4506 * If the id field is set to the value '0' then the locally bound
4507 * addresses are returned without regard to any particular
4510 if (0 == getaddrs
.assoc_id
) {
4511 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4513 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4516 bp
= &asoc
->base
.bind_addr
;
4519 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4520 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4522 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4526 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4527 * addresses from the global local address list.
4529 if (sctp_list_single_entry(&bp
->address_list
)) {
4530 addr
= list_entry(bp
->address_list
.next
,
4531 struct sctp_sockaddr_entry
, list
);
4532 if (sctp_is_any(&addr
->a
)) {
4533 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4534 space_left
, &bytes_copied
);
4544 /* Protection on the bound address list is not needed since
4545 * in the socket option context we hold a socket lock and
4546 * thus the bound address list can't change.
4548 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4549 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4550 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4551 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4552 if (space_left
< addrlen
) {
4553 err
= -ENOMEM
; /*fixme: right error?*/
4556 memcpy(buf
, &temp
, addrlen
);
4558 bytes_copied
+= addrlen
;
4560 space_left
-= addrlen
;
4564 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4568 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4572 if (put_user(bytes_copied
, optlen
))
4579 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4581 * Requests that the local SCTP stack use the enclosed peer address as
4582 * the association primary. The enclosed address must be one of the
4583 * association peer's addresses.
4585 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4586 char __user
*optval
, int __user
*optlen
)
4588 struct sctp_prim prim
;
4589 struct sctp_association
*asoc
;
4590 struct sctp_sock
*sp
= sctp_sk(sk
);
4592 if (len
< sizeof(struct sctp_prim
))
4595 len
= sizeof(struct sctp_prim
);
4597 if (copy_from_user(&prim
, optval
, len
))
4600 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4604 if (!asoc
->peer
.primary_path
)
4607 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4608 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4610 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4611 (union sctp_addr
*)&prim
.ssp_addr
);
4613 if (put_user(len
, optlen
))
4615 if (copy_to_user(optval
, &prim
, len
))
4622 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4624 * Requests that the local endpoint set the specified Adaptation Layer
4625 * Indication parameter for all future INIT and INIT-ACK exchanges.
4627 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4628 char __user
*optval
, int __user
*optlen
)
4630 struct sctp_setadaptation adaptation
;
4632 if (len
< sizeof(struct sctp_setadaptation
))
4635 len
= sizeof(struct sctp_setadaptation
);
4637 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4639 if (put_user(len
, optlen
))
4641 if (copy_to_user(optval
, &adaptation
, len
))
4649 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4651 * Applications that wish to use the sendto() system call may wish to
4652 * specify a default set of parameters that would normally be supplied
4653 * through the inclusion of ancillary data. This socket option allows
4654 * such an application to set the default sctp_sndrcvinfo structure.
4657 * The application that wishes to use this socket option simply passes
4658 * in to this call the sctp_sndrcvinfo structure defined in Section
4659 * 5.2.2) The input parameters accepted by this call include
4660 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4661 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4662 * to this call if the caller is using the UDP model.
4664 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4666 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4667 int len
, char __user
*optval
,
4670 struct sctp_sndrcvinfo info
;
4671 struct sctp_association
*asoc
;
4672 struct sctp_sock
*sp
= sctp_sk(sk
);
4674 if (len
< sizeof(struct sctp_sndrcvinfo
))
4677 len
= sizeof(struct sctp_sndrcvinfo
);
4679 if (copy_from_user(&info
, optval
, len
))
4682 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4683 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4687 info
.sinfo_stream
= asoc
->default_stream
;
4688 info
.sinfo_flags
= asoc
->default_flags
;
4689 info
.sinfo_ppid
= asoc
->default_ppid
;
4690 info
.sinfo_context
= asoc
->default_context
;
4691 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4693 info
.sinfo_stream
= sp
->default_stream
;
4694 info
.sinfo_flags
= sp
->default_flags
;
4695 info
.sinfo_ppid
= sp
->default_ppid
;
4696 info
.sinfo_context
= sp
->default_context
;
4697 info
.sinfo_timetolive
= sp
->default_timetolive
;
4700 if (put_user(len
, optlen
))
4702 if (copy_to_user(optval
, &info
, len
))
4710 * 7.1.5 SCTP_NODELAY
4712 * Turn on/off any Nagle-like algorithm. This means that packets are
4713 * generally sent as soon as possible and no unnecessary delays are
4714 * introduced, at the cost of more packets in the network. Expects an
4715 * integer boolean flag.
4718 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4719 char __user
*optval
, int __user
*optlen
)
4723 if (len
< sizeof(int))
4727 val
= (sctp_sk(sk
)->nodelay
== 1);
4728 if (put_user(len
, optlen
))
4730 if (copy_to_user(optval
, &val
, len
))
4737 * 7.1.1 SCTP_RTOINFO
4739 * The protocol parameters used to initialize and bound retransmission
4740 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4741 * and modify these parameters.
4742 * All parameters are time values, in milliseconds. A value of 0, when
4743 * modifying the parameters, indicates that the current value should not
4747 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4748 char __user
*optval
,
4749 int __user
*optlen
) {
4750 struct sctp_rtoinfo rtoinfo
;
4751 struct sctp_association
*asoc
;
4753 if (len
< sizeof (struct sctp_rtoinfo
))
4756 len
= sizeof(struct sctp_rtoinfo
);
4758 if (copy_from_user(&rtoinfo
, optval
, len
))
4761 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4763 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4766 /* Values corresponding to the specific association. */
4768 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4769 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4770 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4772 /* Values corresponding to the endpoint. */
4773 struct sctp_sock
*sp
= sctp_sk(sk
);
4775 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4776 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4777 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4780 if (put_user(len
, optlen
))
4783 if (copy_to_user(optval
, &rtoinfo
, len
))
4791 * 7.1.2 SCTP_ASSOCINFO
4793 * This option is used to tune the maximum retransmission attempts
4794 * of the association.
4795 * Returns an error if the new association retransmission value is
4796 * greater than the sum of the retransmission value of the peer.
4797 * See [SCTP] for more information.
4800 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4801 char __user
*optval
,
4805 struct sctp_assocparams assocparams
;
4806 struct sctp_association
*asoc
;
4807 struct list_head
*pos
;
4810 if (len
< sizeof (struct sctp_assocparams
))
4813 len
= sizeof(struct sctp_assocparams
);
4815 if (copy_from_user(&assocparams
, optval
, len
))
4818 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4820 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4823 /* Values correspoinding to the specific association */
4825 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4826 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4827 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4828 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4830 (asoc
->cookie_life
.tv_usec
4833 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4837 assocparams
.sasoc_number_peer_destinations
= cnt
;
4839 /* Values corresponding to the endpoint */
4840 struct sctp_sock
*sp
= sctp_sk(sk
);
4842 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4843 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4844 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4845 assocparams
.sasoc_cookie_life
=
4846 sp
->assocparams
.sasoc_cookie_life
;
4847 assocparams
.sasoc_number_peer_destinations
=
4849 sasoc_number_peer_destinations
;
4852 if (put_user(len
, optlen
))
4855 if (copy_to_user(optval
, &assocparams
, len
))
4862 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4864 * This socket option is a boolean flag which turns on or off mapped V4
4865 * addresses. If this option is turned on and the socket is type
4866 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4867 * If this option is turned off, then no mapping will be done of V4
4868 * addresses and a user will receive both PF_INET6 and PF_INET type
4869 * addresses on the socket.
4871 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
4872 char __user
*optval
, int __user
*optlen
)
4875 struct sctp_sock
*sp
= sctp_sk(sk
);
4877 if (len
< sizeof(int))
4882 if (put_user(len
, optlen
))
4884 if (copy_to_user(optval
, &val
, len
))
4891 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
4892 * (chapter and verse is quoted at sctp_setsockopt_context())
4894 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
4895 char __user
*optval
, int __user
*optlen
)
4897 struct sctp_assoc_value params
;
4898 struct sctp_sock
*sp
;
4899 struct sctp_association
*asoc
;
4901 if (len
< sizeof(struct sctp_assoc_value
))
4904 len
= sizeof(struct sctp_assoc_value
);
4906 if (copy_from_user(¶ms
, optval
, len
))
4911 if (params
.assoc_id
!= 0) {
4912 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4915 params
.assoc_value
= asoc
->default_rcv_context
;
4917 params
.assoc_value
= sp
->default_rcv_context
;
4920 if (put_user(len
, optlen
))
4922 if (copy_to_user(optval
, ¶ms
, len
))
4929 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
4931 * This socket option specifies the maximum size to put in any outgoing
4932 * SCTP chunk. If a message is larger than this size it will be
4933 * fragmented by SCTP into the specified size. Note that the underlying
4934 * SCTP implementation may fragment into smaller sized chunks when the
4935 * PMTU of the underlying association is smaller than the value set by
4938 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
4939 char __user
*optval
, int __user
*optlen
)
4943 if (len
< sizeof(int))
4948 val
= sctp_sk(sk
)->user_frag
;
4949 if (put_user(len
, optlen
))
4951 if (copy_to_user(optval
, &val
, len
))
4958 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
4959 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
4961 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
4962 char __user
*optval
, int __user
*optlen
)
4966 if (len
< sizeof(int))
4971 val
= sctp_sk(sk
)->frag_interleave
;
4972 if (put_user(len
, optlen
))
4974 if (copy_to_user(optval
, &val
, len
))
4981 * 7.1.25. Set or Get the sctp partial delivery point
4982 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
4984 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
4985 char __user
*optval
,
4990 if (len
< sizeof(u32
))
4995 val
= sctp_sk(sk
)->pd_point
;
4996 if (put_user(len
, optlen
))
4998 if (copy_to_user(optval
, &val
, len
))
5005 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5006 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5008 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5009 char __user
*optval
,
5012 struct sctp_assoc_value params
;
5013 struct sctp_sock
*sp
;
5014 struct sctp_association
*asoc
;
5016 if (len
< sizeof(int))
5019 if (len
== sizeof(int)) {
5021 "SCTP: Use of int in max_burst socket option deprecated\n");
5023 "SCTP: Use struct sctp_assoc_value instead\n");
5024 params
.assoc_id
= 0;
5025 } else if (len
== sizeof (struct sctp_assoc_value
)) {
5026 if (copy_from_user(¶ms
, optval
, len
))
5033 if (params
.assoc_id
!= 0) {
5034 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5037 params
.assoc_value
= asoc
->max_burst
;
5039 params
.assoc_value
= sp
->max_burst
;
5041 if (len
== sizeof(int)) {
5042 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5045 if (copy_to_user(optval
, ¶ms
, len
))
5053 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5054 char __user
*optval
, int __user
*optlen
)
5056 struct sctp_hmac_algo_param
*hmacs
;
5059 hmacs
= sctp_sk(sk
)->ep
->auth_hmacs_list
;
5060 param_len
= ntohs(hmacs
->param_hdr
.length
);
5062 if (len
< param_len
)
5064 if (put_user(len
, optlen
))
5066 if (copy_to_user(optval
, hmacs
->hmac_ids
, len
))
5072 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5073 char __user
*optval
, int __user
*optlen
)
5075 struct sctp_authkeyid val
;
5076 struct sctp_association
*asoc
;
5078 if (len
< sizeof(struct sctp_authkeyid
))
5080 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5083 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5084 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5088 val
.scact_keynumber
= asoc
->active_key_id
;
5090 val
.scact_keynumber
= sctp_sk(sk
)->ep
->active_key_id
;
5095 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5096 char __user
*optval
, int __user
*optlen
)
5098 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5099 struct sctp_authchunks val
;
5100 struct sctp_association
*asoc
;
5101 struct sctp_chunks_param
*ch
;
5105 if (len
<= sizeof(struct sctp_authchunks
))
5108 if (copy_from_user(&val
, p
, sizeof(struct sctp_authchunks
)))
5111 to
= p
->gauth_chunks
;
5112 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5116 ch
= asoc
->peer
.peer_chunks
;
5118 /* See if the user provided enough room for all the data */
5119 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5120 if (len
< num_chunks
)
5124 if (put_user(len
, optlen
))
5126 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5128 if (copy_to_user(to
, ch
->chunks
, len
))
5134 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
5135 char __user
*optval
, int __user
*optlen
)
5137 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5138 struct sctp_authchunks val
;
5139 struct sctp_association
*asoc
;
5140 struct sctp_chunks_param
*ch
;
5144 if (len
<= sizeof(struct sctp_authchunks
))
5147 if (copy_from_user(&val
, p
, sizeof(struct sctp_authchunks
)))
5150 to
= p
->gauth_chunks
;
5151 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5152 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
5156 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
5158 ch
= sctp_sk(sk
)->ep
->auth_chunk_list
;
5160 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5161 if (len
< num_chunks
)
5165 if (put_user(len
, optlen
))
5167 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5169 if (copy_to_user(to
, ch
->chunks
, len
))
5175 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
5176 char __user
*optval
, int __user
*optlen
)
5181 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5184 /* I can hardly begin to describe how wrong this is. This is
5185 * so broken as to be worse than useless. The API draft
5186 * REALLY is NOT helpful here... I am not convinced that the
5187 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5188 * are at all well-founded.
5190 if (level
!= SOL_SCTP
) {
5191 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5193 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
5197 if (get_user(len
, optlen
))
5204 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
5206 case SCTP_DISABLE_FRAGMENTS
:
5207 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
5211 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
5213 case SCTP_AUTOCLOSE
:
5214 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
5216 case SCTP_SOCKOPT_PEELOFF
:
5217 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
5219 case SCTP_PEER_ADDR_PARAMS
:
5220 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
5223 case SCTP_DELAYED_ACK_TIME
:
5224 retval
= sctp_getsockopt_delayed_ack_time(sk
, len
, optval
,
5228 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
5230 case SCTP_GET_PEER_ADDRS_NUM_OLD
:
5231 retval
= sctp_getsockopt_peer_addrs_num_old(sk
, len
, optval
,
5234 case SCTP_GET_LOCAL_ADDRS_NUM_OLD
:
5235 retval
= sctp_getsockopt_local_addrs_num_old(sk
, len
, optval
,
5238 case SCTP_GET_PEER_ADDRS_OLD
:
5239 retval
= sctp_getsockopt_peer_addrs_old(sk
, len
, optval
,
5242 case SCTP_GET_LOCAL_ADDRS_OLD
:
5243 retval
= sctp_getsockopt_local_addrs_old(sk
, len
, optval
,
5246 case SCTP_GET_PEER_ADDRS
:
5247 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
5250 case SCTP_GET_LOCAL_ADDRS
:
5251 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
5254 case SCTP_DEFAULT_SEND_PARAM
:
5255 retval
= sctp_getsockopt_default_send_param(sk
, len
,
5258 case SCTP_PRIMARY_ADDR
:
5259 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
5262 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
5265 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
5267 case SCTP_ASSOCINFO
:
5268 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
5270 case SCTP_I_WANT_MAPPED_V4_ADDR
:
5271 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
5274 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
5276 case SCTP_GET_PEER_ADDR_INFO
:
5277 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
5280 case SCTP_ADAPTATION_LAYER
:
5281 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
5285 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
5287 case SCTP_FRAGMENT_INTERLEAVE
:
5288 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
5291 case SCTP_PARTIAL_DELIVERY_POINT
:
5292 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
5295 case SCTP_MAX_BURST
:
5296 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
5299 case SCTP_AUTH_CHUNK
:
5300 case SCTP_AUTH_DELETE_KEY
:
5301 retval
= -EOPNOTSUPP
;
5303 case SCTP_HMAC_IDENT
:
5304 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
5306 case SCTP_AUTH_ACTIVE_KEY
:
5307 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
5309 case SCTP_PEER_AUTH_CHUNKS
:
5310 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
5313 case SCTP_LOCAL_AUTH_CHUNKS
:
5314 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
5318 retval
= -ENOPROTOOPT
;
5322 sctp_release_sock(sk
);
5326 static void sctp_hash(struct sock
*sk
)
5331 static void sctp_unhash(struct sock
*sk
)
5336 /* Check if port is acceptable. Possibly find first available port.
5338 * The port hash table (contained in the 'global' SCTP protocol storage
5339 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5340 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5341 * list (the list number is the port number hashed out, so as you
5342 * would expect from a hash function, all the ports in a given list have
5343 * such a number that hashes out to the same list number; you were
5344 * expecting that, right?); so each list has a set of ports, with a
5345 * link to the socket (struct sock) that uses it, the port number and
5346 * a fastreuse flag (FIXME: NPI ipg).
5348 static struct sctp_bind_bucket
*sctp_bucket_create(
5349 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
5351 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
5353 struct sctp_bind_hashbucket
*head
; /* hash list */
5354 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5355 struct hlist_node
*node
;
5356 unsigned short snum
;
5359 snum
= ntohs(addr
->v4
.sin_port
);
5361 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
5362 sctp_local_bh_disable();
5365 /* Search for an available port. */
5366 int low
, high
, remaining
, index
;
5369 inet_get_local_port_range(&low
, &high
);
5370 remaining
= (high
- low
) + 1;
5371 rover
= net_random() % remaining
+ low
;
5375 if ((rover
< low
) || (rover
> high
))
5377 index
= sctp_phashfn(rover
);
5378 head
= &sctp_port_hashtable
[index
];
5379 sctp_spin_lock(&head
->lock
);
5380 sctp_for_each_hentry(pp
, node
, &head
->chain
)
5381 if (pp
->port
== rover
)
5385 sctp_spin_unlock(&head
->lock
);
5386 } while (--remaining
> 0);
5388 /* Exhausted local port range during search? */
5393 /* OK, here is the one we will use. HEAD (the port
5394 * hash table list entry) is non-NULL and we hold it's
5399 /* We are given an specific port number; we verify
5400 * that it is not being used. If it is used, we will
5401 * exahust the search in the hash list corresponding
5402 * to the port number (snum) - we detect that with the
5403 * port iterator, pp being NULL.
5405 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
5406 sctp_spin_lock(&head
->lock
);
5407 sctp_for_each_hentry(pp
, node
, &head
->chain
) {
5408 if (pp
->port
== snum
)
5415 if (!hlist_empty(&pp
->owner
)) {
5416 /* We had a port hash table hit - there is an
5417 * available port (pp != NULL) and it is being
5418 * used by other socket (pp->owner not empty); that other
5419 * socket is going to be sk2.
5421 int reuse
= sk
->sk_reuse
;
5423 struct hlist_node
*node
;
5425 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5426 if (pp
->fastreuse
&& sk
->sk_reuse
&&
5427 sk
->sk_state
!= SCTP_SS_LISTENING
)
5430 /* Run through the list of sockets bound to the port
5431 * (pp->port) [via the pointers bind_next and
5432 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5433 * we get the endpoint they describe and run through
5434 * the endpoint's list of IP (v4 or v6) addresses,
5435 * comparing each of the addresses with the address of
5436 * the socket sk. If we find a match, then that means
5437 * that this port/socket (sk) combination are already
5440 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
5441 struct sctp_endpoint
*ep2
;
5442 ep2
= sctp_sk(sk2
)->ep
;
5444 if (reuse
&& sk2
->sk_reuse
&&
5445 sk2
->sk_state
!= SCTP_SS_LISTENING
)
5448 if (sctp_bind_addr_match(&ep2
->base
.bind_addr
, addr
,
5454 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5457 /* If there was a hash table miss, create a new port. */
5459 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
5462 /* In either case (hit or miss), make sure fastreuse is 1 only
5463 * if sk->sk_reuse is too (that is, if the caller requested
5464 * SO_REUSEADDR on this socket -sk-).
5466 if (hlist_empty(&pp
->owner
)) {
5467 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
5471 } else if (pp
->fastreuse
&&
5472 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
5475 /* We are set, so fill up all the data in the hash table
5476 * entry, tie the socket list information with the rest of the
5477 * sockets FIXME: Blurry, NPI (ipg).
5480 if (!sctp_sk(sk
)->bind_hash
) {
5481 inet_sk(sk
)->num
= snum
;
5482 sk_add_bind_node(sk
, &pp
->owner
);
5483 sctp_sk(sk
)->bind_hash
= pp
;
5488 sctp_spin_unlock(&head
->lock
);
5491 sctp_local_bh_enable();
5495 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5496 * port is requested.
5498 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
5501 union sctp_addr addr
;
5502 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5504 /* Set up a dummy address struct from the sk. */
5505 af
->from_sk(&addr
, sk
);
5506 addr
.v4
.sin_port
= htons(snum
);
5508 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5509 ret
= sctp_get_port_local(sk
, &addr
);
5511 return (ret
? 1 : 0);
5515 * 3.1.3 listen() - UDP Style Syntax
5517 * By default, new associations are not accepted for UDP style sockets.
5518 * An application uses listen() to mark a socket as being able to
5519 * accept new associations.
5521 SCTP_STATIC
int sctp_seqpacket_listen(struct sock
*sk
, int backlog
)
5523 struct sctp_sock
*sp
= sctp_sk(sk
);
5524 struct sctp_endpoint
*ep
= sp
->ep
;
5526 /* Only UDP style sockets that are not peeled off are allowed to
5529 if (!sctp_style(sk
, UDP
))
5532 /* If backlog is zero, disable listening. */
5534 if (sctp_sstate(sk
, CLOSED
))
5537 sctp_unhash_endpoint(ep
);
5538 sk
->sk_state
= SCTP_SS_CLOSED
;
5542 /* Return if we are already listening. */
5543 if (sctp_sstate(sk
, LISTENING
))
5547 * If a bind() or sctp_bindx() is not called prior to a listen()
5548 * call that allows new associations to be accepted, the system
5549 * picks an ephemeral port and will choose an address set equivalent
5550 * to binding with a wildcard address.
5552 * This is not currently spelled out in the SCTP sockets
5553 * extensions draft, but follows the practice as seen in TCP
5556 * Additionally, turn off fastreuse flag since we are not listening
5558 sk
->sk_state
= SCTP_SS_LISTENING
;
5559 if (!ep
->base
.bind_addr
.port
) {
5560 if (sctp_autobind(sk
))
5563 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5565 sctp_hash_endpoint(ep
);
5570 * 4.1.3 listen() - TCP Style Syntax
5572 * Applications uses listen() to ready the SCTP endpoint for accepting
5573 * inbound associations.
5575 SCTP_STATIC
int sctp_stream_listen(struct sock
*sk
, int backlog
)
5577 struct sctp_sock
*sp
= sctp_sk(sk
);
5578 struct sctp_endpoint
*ep
= sp
->ep
;
5580 /* If backlog is zero, disable listening. */
5582 if (sctp_sstate(sk
, CLOSED
))
5585 sctp_unhash_endpoint(ep
);
5586 sk
->sk_state
= SCTP_SS_CLOSED
;
5590 if (sctp_sstate(sk
, LISTENING
))
5594 * If a bind() or sctp_bindx() is not called prior to a listen()
5595 * call that allows new associations to be accepted, the system
5596 * picks an ephemeral port and will choose an address set equivalent
5597 * to binding with a wildcard address.
5599 * This is not currently spelled out in the SCTP sockets
5600 * extensions draft, but follows the practice as seen in TCP
5603 sk
->sk_state
= SCTP_SS_LISTENING
;
5604 if (!ep
->base
.bind_addr
.port
) {
5605 if (sctp_autobind(sk
))
5608 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5610 sk
->sk_max_ack_backlog
= backlog
;
5611 sctp_hash_endpoint(ep
);
5616 * Move a socket to LISTENING state.
5618 int sctp_inet_listen(struct socket
*sock
, int backlog
)
5620 struct sock
*sk
= sock
->sk
;
5621 struct crypto_hash
*tfm
= NULL
;
5624 if (unlikely(backlog
< 0))
5629 if (sock
->state
!= SS_UNCONNECTED
)
5632 /* Allocate HMAC for generating cookie. */
5633 if (sctp_hmac_alg
) {
5634 tfm
= crypto_alloc_hash(sctp_hmac_alg
, 0, CRYPTO_ALG_ASYNC
);
5636 if (net_ratelimit()) {
5638 "SCTP: failed to load transform for %s: %ld\n",
5639 sctp_hmac_alg
, PTR_ERR(tfm
));
5646 switch (sock
->type
) {
5647 case SOCK_SEQPACKET
:
5648 err
= sctp_seqpacket_listen(sk
, backlog
);
5651 err
= sctp_stream_listen(sk
, backlog
);
5660 /* Store away the transform reference. */
5661 sctp_sk(sk
)->hmac
= tfm
;
5663 sctp_release_sock(sk
);
5666 crypto_free_hash(tfm
);
5671 * This function is done by modeling the current datagram_poll() and the
5672 * tcp_poll(). Note that, based on these implementations, we don't
5673 * lock the socket in this function, even though it seems that,
5674 * ideally, locking or some other mechanisms can be used to ensure
5675 * the integrity of the counters (sndbuf and wmem_alloc) used
5676 * in this place. We assume that we don't need locks either until proven
5679 * Another thing to note is that we include the Async I/O support
5680 * here, again, by modeling the current TCP/UDP code. We don't have
5681 * a good way to test with it yet.
5683 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
5685 struct sock
*sk
= sock
->sk
;
5686 struct sctp_sock
*sp
= sctp_sk(sk
);
5689 poll_wait(file
, sk
->sk_sleep
, wait
);
5691 /* A TCP-style listening socket becomes readable when the accept queue
5694 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
5695 return (!list_empty(&sp
->ep
->asocs
)) ?
5696 (POLLIN
| POLLRDNORM
) : 0;
5700 /* Is there any exceptional events? */
5701 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
5703 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5705 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
5708 /* Is it readable? Reconsider this code with TCP-style support. */
5709 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
5710 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
5711 mask
|= POLLIN
| POLLRDNORM
;
5713 /* The association is either gone or not ready. */
5714 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
5717 /* Is it writable? */
5718 if (sctp_writeable(sk
)) {
5719 mask
|= POLLOUT
| POLLWRNORM
;
5721 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
5723 * Since the socket is not locked, the buffer
5724 * might be made available after the writeable check and
5725 * before the bit is set. This could cause a lost I/O
5726 * signal. tcp_poll() has a race breaker for this race
5727 * condition. Based on their implementation, we put
5728 * in the following code to cover it as well.
5730 if (sctp_writeable(sk
))
5731 mask
|= POLLOUT
| POLLWRNORM
;
5736 /********************************************************************
5737 * 2nd Level Abstractions
5738 ********************************************************************/
5740 static struct sctp_bind_bucket
*sctp_bucket_create(
5741 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
5743 struct sctp_bind_bucket
*pp
;
5745 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
5747 SCTP_DBG_OBJCNT_INC(bind_bucket
);
5750 INIT_HLIST_HEAD(&pp
->owner
);
5751 hlist_add_head(&pp
->node
, &head
->chain
);
5756 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5757 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
5759 if (pp
&& hlist_empty(&pp
->owner
)) {
5760 __hlist_del(&pp
->node
);
5761 kmem_cache_free(sctp_bucket_cachep
, pp
);
5762 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
5766 /* Release this socket's reference to a local port. */
5767 static inline void __sctp_put_port(struct sock
*sk
)
5769 struct sctp_bind_hashbucket
*head
=
5770 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->num
)];
5771 struct sctp_bind_bucket
*pp
;
5773 sctp_spin_lock(&head
->lock
);
5774 pp
= sctp_sk(sk
)->bind_hash
;
5775 __sk_del_bind_node(sk
);
5776 sctp_sk(sk
)->bind_hash
= NULL
;
5777 inet_sk(sk
)->num
= 0;
5778 sctp_bucket_destroy(pp
);
5779 sctp_spin_unlock(&head
->lock
);
5782 void sctp_put_port(struct sock
*sk
)
5784 sctp_local_bh_disable();
5785 __sctp_put_port(sk
);
5786 sctp_local_bh_enable();
5790 * The system picks an ephemeral port and choose an address set equivalent
5791 * to binding with a wildcard address.
5792 * One of those addresses will be the primary address for the association.
5793 * This automatically enables the multihoming capability of SCTP.
5795 static int sctp_autobind(struct sock
*sk
)
5797 union sctp_addr autoaddr
;
5801 /* Initialize a local sockaddr structure to INADDR_ANY. */
5802 af
= sctp_sk(sk
)->pf
->af
;
5804 port
= htons(inet_sk(sk
)->num
);
5805 af
->inaddr_any(&autoaddr
, port
);
5807 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5810 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5813 * 4.2 The cmsghdr Structure *
5815 * When ancillary data is sent or received, any number of ancillary data
5816 * objects can be specified by the msg_control and msg_controllen members of
5817 * the msghdr structure, because each object is preceded by
5818 * a cmsghdr structure defining the object's length (the cmsg_len member).
5819 * Historically Berkeley-derived implementations have passed only one object
5820 * at a time, but this API allows multiple objects to be
5821 * passed in a single call to sendmsg() or recvmsg(). The following example
5822 * shows two ancillary data objects in a control buffer.
5824 * |<--------------------------- msg_controllen -------------------------->|
5827 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5829 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5832 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5834 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5837 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5838 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5840 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5842 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5849 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
5850 sctp_cmsgs_t
*cmsgs
)
5852 struct cmsghdr
*cmsg
;
5853 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
5855 for (cmsg
= CMSG_FIRSTHDR(msg
);
5857 cmsg
= CMSG_NXTHDR(my_msg
, cmsg
)) {
5858 if (!CMSG_OK(my_msg
, cmsg
))
5861 /* Should we parse this header or ignore? */
5862 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
5865 /* Strictly check lengths following example in SCM code. */
5866 switch (cmsg
->cmsg_type
) {
5868 /* SCTP Socket API Extension
5869 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5871 * This cmsghdr structure provides information for
5872 * initializing new SCTP associations with sendmsg().
5873 * The SCTP_INITMSG socket option uses this same data
5874 * structure. This structure is not used for
5877 * cmsg_level cmsg_type cmsg_data[]
5878 * ------------ ------------ ----------------------
5879 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5881 if (cmsg
->cmsg_len
!=
5882 CMSG_LEN(sizeof(struct sctp_initmsg
)))
5884 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
5888 /* SCTP Socket API Extension
5889 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5891 * This cmsghdr structure specifies SCTP options for
5892 * sendmsg() and describes SCTP header information
5893 * about a received message through recvmsg().
5895 * cmsg_level cmsg_type cmsg_data[]
5896 * ------------ ------------ ----------------------
5897 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5899 if (cmsg
->cmsg_len
!=
5900 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
5904 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
5906 /* Minimally, validate the sinfo_flags. */
5907 if (cmsgs
->info
->sinfo_flags
&
5908 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
5909 SCTP_ABORT
| SCTP_EOF
))
5921 * Wait for a packet..
5922 * Note: This function is the same function as in core/datagram.c
5923 * with a few modifications to make lksctp work.
5925 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
5930 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5932 /* Socket errors? */
5933 error
= sock_error(sk
);
5937 if (!skb_queue_empty(&sk
->sk_receive_queue
))
5940 /* Socket shut down? */
5941 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5944 /* Sequenced packets can come disconnected. If so we report the
5949 /* Is there a good reason to think that we may receive some data? */
5950 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
5953 /* Handle signals. */
5954 if (signal_pending(current
))
5957 /* Let another process have a go. Since we are going to sleep
5958 * anyway. Note: This may cause odd behaviors if the message
5959 * does not fit in the user's buffer, but this seems to be the
5960 * only way to honor MSG_DONTWAIT realistically.
5962 sctp_release_sock(sk
);
5963 *timeo_p
= schedule_timeout(*timeo_p
);
5967 finish_wait(sk
->sk_sleep
, &wait
);
5971 error
= sock_intr_errno(*timeo_p
);
5974 finish_wait(sk
->sk_sleep
, &wait
);
5979 /* Receive a datagram.
5980 * Note: This is pretty much the same routine as in core/datagram.c
5981 * with a few changes to make lksctp work.
5983 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
5984 int noblock
, int *err
)
5987 struct sk_buff
*skb
;
5990 timeo
= sock_rcvtimeo(sk
, noblock
);
5992 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
5993 timeo
, MAX_SCHEDULE_TIMEOUT
);
5996 /* Again only user level code calls this function,
5997 * so nothing interrupt level
5998 * will suddenly eat the receive_queue.
6000 * Look at current nfs client by the way...
6001 * However, this function was corrent in any case. 8)
6003 if (flags
& MSG_PEEK
) {
6004 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
6005 skb
= skb_peek(&sk
->sk_receive_queue
);
6007 atomic_inc(&skb
->users
);
6008 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
6010 skb
= skb_dequeue(&sk
->sk_receive_queue
);
6016 /* Caller is allowed not to check sk->sk_err before calling. */
6017 error
= sock_error(sk
);
6021 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6024 /* User doesn't want to wait. */
6028 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
6037 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6038 static void __sctp_write_space(struct sctp_association
*asoc
)
6040 struct sock
*sk
= asoc
->base
.sk
;
6041 struct socket
*sock
= sk
->sk_socket
;
6043 if ((sctp_wspace(asoc
) > 0) && sock
) {
6044 if (waitqueue_active(&asoc
->wait
))
6045 wake_up_interruptible(&asoc
->wait
);
6047 if (sctp_writeable(sk
)) {
6048 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
6049 wake_up_interruptible(sk
->sk_sleep
);
6051 /* Note that we try to include the Async I/O support
6052 * here by modeling from the current TCP/UDP code.
6053 * We have not tested with it yet.
6055 if (sock
->fasync_list
&&
6056 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
6057 sock_wake_async(sock
,
6058 SOCK_WAKE_SPACE
, POLL_OUT
);
6063 /* Do accounting for the sndbuf space.
6064 * Decrement the used sndbuf space of the corresponding association by the
6065 * data size which was just transmitted(freed).
6067 static void sctp_wfree(struct sk_buff
*skb
)
6069 struct sctp_association
*asoc
;
6070 struct sctp_chunk
*chunk
;
6073 /* Get the saved chunk pointer. */
6074 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
6077 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
6078 sizeof(struct sk_buff
) +
6079 sizeof(struct sctp_chunk
);
6081 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
6084 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6086 sk
->sk_wmem_queued
-= skb
->truesize
;
6087 sk_mem_uncharge(sk
, skb
->truesize
);
6090 __sctp_write_space(asoc
);
6092 sctp_association_put(asoc
);
6095 /* Do accounting for the receive space on the socket.
6096 * Accounting for the association is done in ulpevent.c
6097 * We set this as a destructor for the cloned data skbs so that
6098 * accounting is done at the correct time.
6100 void sctp_sock_rfree(struct sk_buff
*skb
)
6102 struct sock
*sk
= skb
->sk
;
6103 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
6105 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
6108 * Mimic the behavior of sock_rfree
6110 sk_mem_uncharge(sk
, event
->rmem_len
);
6114 /* Helper function to wait for space in the sndbuf. */
6115 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
6118 struct sock
*sk
= asoc
->base
.sk
;
6120 long current_timeo
= *timeo_p
;
6123 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6124 asoc
, (long)(*timeo_p
), msg_len
);
6126 /* Increment the association's refcnt. */
6127 sctp_association_hold(asoc
);
6129 /* Wait on the association specific sndbuf space. */
6131 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6132 TASK_INTERRUPTIBLE
);
6135 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6138 if (signal_pending(current
))
6139 goto do_interrupted
;
6140 if (msg_len
<= sctp_wspace(asoc
))
6143 /* Let another process have a go. Since we are going
6146 sctp_release_sock(sk
);
6147 current_timeo
= schedule_timeout(current_timeo
);
6148 BUG_ON(sk
!= asoc
->base
.sk
);
6151 *timeo_p
= current_timeo
;
6155 finish_wait(&asoc
->wait
, &wait
);
6157 /* Release the association's refcnt. */
6158 sctp_association_put(asoc
);
6167 err
= sock_intr_errno(*timeo_p
);
6175 /* If socket sndbuf has changed, wake up all per association waiters. */
6176 void sctp_write_space(struct sock
*sk
)
6178 struct sctp_association
*asoc
;
6180 /* Wake up the tasks in each wait queue. */
6181 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
6182 __sctp_write_space(asoc
);
6186 /* Is there any sndbuf space available on the socket?
6188 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6189 * associations on the same socket. For a UDP-style socket with
6190 * multiple associations, it is possible for it to be "unwriteable"
6191 * prematurely. I assume that this is acceptable because
6192 * a premature "unwriteable" is better than an accidental "writeable" which
6193 * would cause an unwanted block under certain circumstances. For the 1-1
6194 * UDP-style sockets or TCP-style sockets, this code should work.
6197 static int sctp_writeable(struct sock
*sk
)
6201 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
6207 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6208 * returns immediately with EINPROGRESS.
6210 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
6212 struct sock
*sk
= asoc
->base
.sk
;
6214 long current_timeo
= *timeo_p
;
6217 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__
, asoc
,
6220 /* Increment the association's refcnt. */
6221 sctp_association_hold(asoc
);
6224 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6225 TASK_INTERRUPTIBLE
);
6228 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6230 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6233 if (signal_pending(current
))
6234 goto do_interrupted
;
6236 if (sctp_state(asoc
, ESTABLISHED
))
6239 /* Let another process have a go. Since we are going
6242 sctp_release_sock(sk
);
6243 current_timeo
= schedule_timeout(current_timeo
);
6246 *timeo_p
= current_timeo
;
6250 finish_wait(&asoc
->wait
, &wait
);
6252 /* Release the association's refcnt. */
6253 sctp_association_put(asoc
);
6258 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
6261 err
= -ECONNREFUSED
;
6265 err
= sock_intr_errno(*timeo_p
);
6273 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
6275 struct sctp_endpoint
*ep
;
6279 ep
= sctp_sk(sk
)->ep
;
6283 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
,
6284 TASK_INTERRUPTIBLE
);
6286 if (list_empty(&ep
->asocs
)) {
6287 sctp_release_sock(sk
);
6288 timeo
= schedule_timeout(timeo
);
6293 if (!sctp_sstate(sk
, LISTENING
))
6297 if (!list_empty(&ep
->asocs
))
6300 err
= sock_intr_errno(timeo
);
6301 if (signal_pending(current
))
6309 finish_wait(sk
->sk_sleep
, &wait
);
6314 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
6319 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
6320 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
6322 sctp_release_sock(sk
);
6323 timeout
= schedule_timeout(timeout
);
6325 } while (!signal_pending(current
) && timeout
);
6327 finish_wait(sk
->sk_sleep
, &wait
);
6330 static void sctp_sock_rfree_frag(struct sk_buff
*skb
)
6332 struct sk_buff
*frag
;
6337 /* Don't forget the fragments. */
6338 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
6339 sctp_sock_rfree_frag(frag
);
6342 sctp_sock_rfree(skb
);
6345 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
6347 struct sk_buff
*frag
;
6352 /* Don't forget the fragments. */
6353 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
6354 sctp_skb_set_owner_r_frag(frag
, sk
);
6357 sctp_skb_set_owner_r(skb
, sk
);
6360 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6361 * and its messages to the newsk.
6363 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
6364 struct sctp_association
*assoc
,
6365 sctp_socket_type_t type
)
6367 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
6368 struct sctp_sock
*newsp
= sctp_sk(newsk
);
6369 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
6370 struct sctp_endpoint
*newep
= newsp
->ep
;
6371 struct sk_buff
*skb
, *tmp
;
6372 struct sctp_ulpevent
*event
;
6373 struct sctp_bind_hashbucket
*head
;
6375 /* Migrate socket buffer sizes and all the socket level options to the
6378 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
6379 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
6380 /* Brute force copy old sctp opt. */
6381 inet_sk_copy_descendant(newsk
, oldsk
);
6383 /* Restore the ep value that was overwritten with the above structure
6389 /* Hook this new socket in to the bind_hash list. */
6390 head
= &sctp_port_hashtable
[sctp_phashfn(inet_sk(oldsk
)->num
)];
6391 sctp_local_bh_disable();
6392 sctp_spin_lock(&head
->lock
);
6393 pp
= sctp_sk(oldsk
)->bind_hash
;
6394 sk_add_bind_node(newsk
, &pp
->owner
);
6395 sctp_sk(newsk
)->bind_hash
= pp
;
6396 inet_sk(newsk
)->num
= inet_sk(oldsk
)->num
;
6397 sctp_spin_unlock(&head
->lock
);
6398 sctp_local_bh_enable();
6400 /* Copy the bind_addr list from the original endpoint to the new
6401 * endpoint so that we can handle restarts properly
6403 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
6404 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
6406 /* Move any messages in the old socket's receive queue that are for the
6407 * peeled off association to the new socket's receive queue.
6409 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
6410 event
= sctp_skb2event(skb
);
6411 if (event
->asoc
== assoc
) {
6412 sctp_sock_rfree_frag(skb
);
6413 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
6414 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
6415 sctp_skb_set_owner_r_frag(skb
, newsk
);
6419 /* Clean up any messages pending delivery due to partial
6420 * delivery. Three cases:
6421 * 1) No partial deliver; no work.
6422 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6423 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6425 skb_queue_head_init(&newsp
->pd_lobby
);
6426 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
6428 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
6429 struct sk_buff_head
*queue
;
6431 /* Decide which queue to move pd_lobby skbs to. */
6432 if (assoc
->ulpq
.pd_mode
) {
6433 queue
= &newsp
->pd_lobby
;
6435 queue
= &newsk
->sk_receive_queue
;
6437 /* Walk through the pd_lobby, looking for skbs that
6438 * need moved to the new socket.
6440 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6441 event
= sctp_skb2event(skb
);
6442 if (event
->asoc
== assoc
) {
6443 sctp_sock_rfree_frag(skb
);
6444 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6445 __skb_queue_tail(queue
, skb
);
6446 sctp_skb_set_owner_r_frag(skb
, newsk
);
6450 /* Clear up any skbs waiting for the partial
6451 * delivery to finish.
6453 if (assoc
->ulpq
.pd_mode
)
6454 sctp_clear_pd(oldsk
, NULL
);
6458 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
) {
6459 sctp_sock_rfree_frag(skb
);
6460 sctp_skb_set_owner_r_frag(skb
, newsk
);
6463 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
) {
6464 sctp_sock_rfree_frag(skb
);
6465 sctp_skb_set_owner_r_frag(skb
, newsk
);
6468 /* Set the type of socket to indicate that it is peeled off from the
6469 * original UDP-style socket or created with the accept() call on a
6470 * TCP-style socket..
6474 /* Mark the new socket "in-use" by the user so that any packets
6475 * that may arrive on the association after we've moved it are
6476 * queued to the backlog. This prevents a potential race between
6477 * backlog processing on the old socket and new-packet processing
6478 * on the new socket.
6480 * The caller has just allocated newsk so we can guarantee that other
6481 * paths won't try to lock it and then oldsk.
6483 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
6484 sctp_assoc_migrate(assoc
, newsk
);
6486 /* If the association on the newsk is already closed before accept()
6487 * is called, set RCV_SHUTDOWN flag.
6489 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
6490 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
6492 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
6493 sctp_release_sock(newsk
);
6497 /* This proto struct describes the ULP interface for SCTP. */
6498 struct proto sctp_prot
= {
6500 .owner
= THIS_MODULE
,
6501 .close
= sctp_close
,
6502 .connect
= sctp_connect
,
6503 .disconnect
= sctp_disconnect
,
6504 .accept
= sctp_accept
,
6505 .ioctl
= sctp_ioctl
,
6506 .init
= sctp_init_sock
,
6507 .destroy
= sctp_destroy_sock
,
6508 .shutdown
= sctp_shutdown
,
6509 .setsockopt
= sctp_setsockopt
,
6510 .getsockopt
= sctp_getsockopt
,
6511 .sendmsg
= sctp_sendmsg
,
6512 .recvmsg
= sctp_recvmsg
,
6514 .backlog_rcv
= sctp_backlog_rcv
,
6516 .unhash
= sctp_unhash
,
6517 .get_port
= sctp_get_port
,
6518 .obj_size
= sizeof(struct sctp_sock
),
6519 .sysctl_mem
= sysctl_sctp_mem
,
6520 .sysctl_rmem
= sysctl_sctp_rmem
,
6521 .sysctl_wmem
= sysctl_sctp_wmem
,
6522 .memory_pressure
= &sctp_memory_pressure
,
6523 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6524 .memory_allocated
= &sctp_memory_allocated
,
6525 .sockets_allocated
= &sctp_sockets_allocated
,
6528 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6530 struct proto sctpv6_prot
= {
6532 .owner
= THIS_MODULE
,
6533 .close
= sctp_close
,
6534 .connect
= sctp_connect
,
6535 .disconnect
= sctp_disconnect
,
6536 .accept
= sctp_accept
,
6537 .ioctl
= sctp_ioctl
,
6538 .init
= sctp_init_sock
,
6539 .destroy
= sctp_destroy_sock
,
6540 .shutdown
= sctp_shutdown
,
6541 .setsockopt
= sctp_setsockopt
,
6542 .getsockopt
= sctp_getsockopt
,
6543 .sendmsg
= sctp_sendmsg
,
6544 .recvmsg
= sctp_recvmsg
,
6546 .backlog_rcv
= sctp_backlog_rcv
,
6548 .unhash
= sctp_unhash
,
6549 .get_port
= sctp_get_port
,
6550 .obj_size
= sizeof(struct sctp6_sock
),
6551 .sysctl_mem
= sysctl_sctp_mem
,
6552 .sysctl_rmem
= sysctl_sctp_rmem
,
6553 .sysctl_wmem
= sysctl_sctp_wmem
,
6554 .memory_pressure
= &sctp_memory_pressure
,
6555 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6556 .memory_allocated
= &sctp_memory_allocated
,
6557 .sockets_allocated
= &sctp_sockets_allocated
,
6559 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */