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
,
960 sctp_assoc_t
*assoc_id
)
962 struct sctp_sock
*sp
;
963 struct sctp_endpoint
*ep
;
964 struct sctp_association
*asoc
= NULL
;
965 struct sctp_association
*asoc2
;
966 struct sctp_transport
*transport
;
974 union sctp_addr
*sa_addr
= NULL
;
977 unsigned int f_flags
= 0;
982 /* connect() cannot be done on a socket that is already in ESTABLISHED
983 * state - UDP-style peeled off socket or a TCP-style socket that
984 * is already connected.
985 * It cannot be done even on a TCP-style listening socket.
987 if (sctp_sstate(sk
, ESTABLISHED
) ||
988 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
993 /* Walk through the addrs buffer and count the number of addresses. */
995 while (walk_size
< addrs_size
) {
996 sa_addr
= (union sctp_addr
*)addr_buf
;
997 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
998 port
= ntohs(sa_addr
->v4
.sin_port
);
1000 /* If the address family is not supported or if this address
1001 * causes the address buffer to overflow return EINVAL.
1003 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1008 /* Save current address so we can work with it */
1009 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1011 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1015 /* Make sure the destination port is correctly set
1018 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
)
1022 /* Check if there already is a matching association on the
1023 * endpoint (other than the one created here).
1025 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1026 if (asoc2
&& asoc2
!= asoc
) {
1027 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1034 /* If we could not find a matching association on the endpoint,
1035 * make sure that there is no peeled-off association matching
1036 * the peer address even on another socket.
1038 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1039 err
= -EADDRNOTAVAIL
;
1044 /* If a bind() or sctp_bindx() is not called prior to
1045 * an sctp_connectx() call, the system picks an
1046 * ephemeral port and will choose an address set
1047 * equivalent to binding with a wildcard address.
1049 if (!ep
->base
.bind_addr
.port
) {
1050 if (sctp_autobind(sk
)) {
1056 * If an unprivileged user inherits a 1-many
1057 * style socket with open associations on a
1058 * privileged port, it MAY be permitted to
1059 * accept new associations, but it SHOULD NOT
1060 * be permitted to open new associations.
1062 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1063 !capable(CAP_NET_BIND_SERVICE
)) {
1069 scope
= sctp_scope(&to
);
1070 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1077 /* Prime the peer's transport structures. */
1078 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1086 addr_buf
+= af
->sockaddr_len
;
1087 walk_size
+= af
->sockaddr_len
;
1090 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1095 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1100 /* Initialize sk's dport and daddr for getpeername() */
1101 inet_sk(sk
)->dport
= htons(asoc
->peer
.port
);
1102 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1103 af
->to_sk_daddr(sa_addr
, sk
);
1106 /* in-kernel sockets don't generally have a file allocated to them
1107 * if all they do is call sock_create_kern().
1109 if (sk
->sk_socket
->file
)
1110 f_flags
= sk
->sk_socket
->file
->f_flags
;
1112 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1114 err
= sctp_wait_for_connect(asoc
, &timeo
);
1115 if (!err
&& assoc_id
)
1116 *assoc_id
= asoc
->assoc_id
;
1118 /* Don't free association on exit. */
1123 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1124 " kaddrs: %p err: %d\n",
1127 sctp_association_free(asoc
);
1131 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1134 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1135 * sctp_assoc_t *asoc);
1137 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1138 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1139 * or IPv6 addresses.
1141 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1142 * Section 3.1.2 for this usage.
1144 * addrs is a pointer to an array of one or more socket addresses. Each
1145 * address is contained in its appropriate structure (i.e. struct
1146 * sockaddr_in or struct sockaddr_in6) the family of the address type
1147 * must be used to distengish the address length (note that this
1148 * representation is termed a "packed array" of addresses). The caller
1149 * specifies the number of addresses in the array with addrcnt.
1151 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1152 * the association id of the new association. On failure, sctp_connectx()
1153 * returns -1, and sets errno to the appropriate error code. The assoc_id
1154 * is not touched by the kernel.
1156 * For SCTP, the port given in each socket address must be the same, or
1157 * sctp_connectx() will fail, setting errno to EINVAL.
1159 * An application can use sctp_connectx to initiate an association with
1160 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1161 * allows a caller to specify multiple addresses at which a peer can be
1162 * reached. The way the SCTP stack uses the list of addresses to set up
1163 * the association is implementation dependant. This function only
1164 * specifies that the stack will try to make use of all the addresses in
1165 * the list when needed.
1167 * Note that the list of addresses passed in is only used for setting up
1168 * the association. It does not necessarily equal the set of addresses
1169 * the peer uses for the resulting association. If the caller wants to
1170 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1171 * retrieve them after the association has been set up.
1173 * Basically do nothing but copying the addresses from user to kernel
1174 * land and invoking either sctp_connectx(). This is used for tunneling
1175 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1177 * We don't use copy_from_user() for optimization: we first do the
1178 * sanity checks (buffer size -fast- and access check-healthy
1179 * pointer); if all of those succeed, then we can alloc the memory
1180 * (expensive operation) needed to copy the data to kernel. Then we do
1181 * the copying without checking the user space area
1182 * (__copy_from_user()).
1184 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1187 * sk The sk of the socket
1188 * addrs The pointer to the addresses in user land
1189 * addrssize Size of the addrs buffer
1191 * Returns >=0 if ok, <0 errno code on error.
1193 SCTP_STATIC
int __sctp_setsockopt_connectx(struct sock
* sk
,
1194 struct sockaddr __user
*addrs
,
1196 sctp_assoc_t
*assoc_id
)
1199 struct sockaddr
*kaddrs
;
1201 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1202 __func__
, sk
, addrs
, addrs_size
);
1204 if (unlikely(addrs_size
<= 0))
1207 /* Check the user passed a healthy pointer. */
1208 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1211 /* Alloc space for the address array in kernel memory. */
1212 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1213 if (unlikely(!kaddrs
))
1216 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1219 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, assoc_id
);
1228 * This is an older interface. It's kept for backward compatibility
1229 * to the option that doesn't provide association id.
1231 SCTP_STATIC
int sctp_setsockopt_connectx_old(struct sock
* sk
,
1232 struct sockaddr __user
*addrs
,
1235 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1239 * New interface for the API. The since the API is done with a socket
1240 * option, to make it simple we feed back the association id is as a return
1241 * indication to the call. Error is always negative and association id is
1244 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1245 struct sockaddr __user
*addrs
,
1248 sctp_assoc_t assoc_id
= 0;
1251 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1259 /* API 3.1.4 close() - UDP Style Syntax
1260 * Applications use close() to perform graceful shutdown (as described in
1261 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1262 * by a UDP-style socket.
1266 * ret = close(int sd);
1268 * sd - the socket descriptor of the associations to be closed.
1270 * To gracefully shutdown a specific association represented by the
1271 * UDP-style socket, an application should use the sendmsg() call,
1272 * passing no user data, but including the appropriate flag in the
1273 * ancillary data (see Section xxxx).
1275 * If sd in the close() call is a branched-off socket representing only
1276 * one association, the shutdown is performed on that association only.
1278 * 4.1.6 close() - TCP Style Syntax
1280 * Applications use close() to gracefully close down an association.
1284 * int close(int sd);
1286 * sd - the socket descriptor of the association to be closed.
1288 * After an application calls close() on a socket descriptor, no further
1289 * socket operations will succeed on that descriptor.
1291 * API 7.1.4 SO_LINGER
1293 * An application using the TCP-style socket can use this option to
1294 * perform the SCTP ABORT primitive. The linger option structure is:
1297 * int l_onoff; // option on/off
1298 * int l_linger; // linger time
1301 * To enable the option, set l_onoff to 1. If the l_linger value is set
1302 * to 0, calling close() is the same as the ABORT primitive. If the
1303 * value is set to a negative value, the setsockopt() call will return
1304 * an error. If the value is set to a positive value linger_time, the
1305 * close() can be blocked for at most linger_time ms. If the graceful
1306 * shutdown phase does not finish during this period, close() will
1307 * return but the graceful shutdown phase continues in the system.
1309 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1311 struct sctp_endpoint
*ep
;
1312 struct sctp_association
*asoc
;
1313 struct list_head
*pos
, *temp
;
1315 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1318 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1320 ep
= sctp_sk(sk
)->ep
;
1322 /* Walk all associations on an endpoint. */
1323 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1324 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1326 if (sctp_style(sk
, TCP
)) {
1327 /* A closed association can still be in the list if
1328 * it belongs to a TCP-style listening socket that is
1329 * not yet accepted. If so, free it. If not, send an
1330 * ABORT or SHUTDOWN based on the linger options.
1332 if (sctp_state(asoc
, CLOSED
)) {
1333 sctp_unhash_established(asoc
);
1334 sctp_association_free(asoc
);
1339 if (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
) {
1340 struct sctp_chunk
*chunk
;
1342 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1344 sctp_primitive_ABORT(asoc
, chunk
);
1346 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1349 /* Clean up any skbs sitting on the receive queue. */
1350 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1351 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1353 /* On a TCP-style socket, block for at most linger_time if set. */
1354 if (sctp_style(sk
, TCP
) && timeout
)
1355 sctp_wait_for_close(sk
, timeout
);
1357 /* This will run the backlog queue. */
1358 sctp_release_sock(sk
);
1360 /* Supposedly, no process has access to the socket, but
1361 * the net layers still may.
1363 sctp_local_bh_disable();
1364 sctp_bh_lock_sock(sk
);
1366 /* Hold the sock, since sk_common_release() will put sock_put()
1367 * and we have just a little more cleanup.
1370 sk_common_release(sk
);
1372 sctp_bh_unlock_sock(sk
);
1373 sctp_local_bh_enable();
1377 SCTP_DBG_OBJCNT_DEC(sock
);
1380 /* Handle EPIPE error. */
1381 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1384 err
= sock_error(sk
) ? : -EPIPE
;
1385 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1386 send_sig(SIGPIPE
, current
, 0);
1390 /* API 3.1.3 sendmsg() - UDP Style Syntax
1392 * An application uses sendmsg() and recvmsg() calls to transmit data to
1393 * and receive data from its peer.
1395 * ssize_t sendmsg(int socket, const struct msghdr *message,
1398 * socket - the socket descriptor of the endpoint.
1399 * message - pointer to the msghdr structure which contains a single
1400 * user message and possibly some ancillary data.
1402 * See Section 5 for complete description of the data
1405 * flags - flags sent or received with the user message, see Section
1406 * 5 for complete description of the flags.
1408 * Note: This function could use a rewrite especially when explicit
1409 * connect support comes in.
1411 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1413 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1415 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1416 struct msghdr
*msg
, size_t msg_len
)
1418 struct sctp_sock
*sp
;
1419 struct sctp_endpoint
*ep
;
1420 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1421 struct sctp_transport
*transport
, *chunk_tp
;
1422 struct sctp_chunk
*chunk
;
1424 struct sockaddr
*msg_name
= NULL
;
1425 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1426 struct sctp_sndrcvinfo
*sinfo
;
1427 struct sctp_initmsg
*sinit
;
1428 sctp_assoc_t associd
= 0;
1429 sctp_cmsgs_t cmsgs
= { NULL
};
1433 __u16 sinfo_flags
= 0;
1434 struct sctp_datamsg
*datamsg
;
1435 int msg_flags
= msg
->msg_flags
;
1437 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1444 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1446 /* We cannot send a message over a TCP-style listening socket. */
1447 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1452 /* Parse out the SCTP CMSGs. */
1453 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1456 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1460 /* Fetch the destination address for this packet. This
1461 * address only selects the association--it is not necessarily
1462 * the address we will send to.
1463 * For a peeled-off socket, msg_name is ignored.
1465 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1466 int msg_namelen
= msg
->msg_namelen
;
1468 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1473 if (msg_namelen
> sizeof(to
))
1474 msg_namelen
= sizeof(to
);
1475 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1476 msg_name
= msg
->msg_name
;
1482 /* Did the user specify SNDRCVINFO? */
1484 sinfo_flags
= sinfo
->sinfo_flags
;
1485 associd
= sinfo
->sinfo_assoc_id
;
1488 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1489 msg_len
, sinfo_flags
);
1491 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1492 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1497 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1498 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1499 * If SCTP_ABORT is set, the message length could be non zero with
1500 * the msg_iov set to the user abort reason.
1502 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1503 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1508 /* If SCTP_ADDR_OVER is set, there must be an address
1509 * specified in msg_name.
1511 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1518 SCTP_DEBUG_PRINTK("About to look up association.\n");
1522 /* If a msg_name has been specified, assume this is to be used. */
1524 /* Look for a matching association on the endpoint. */
1525 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1527 /* If we could not find a matching association on the
1528 * endpoint, make sure that it is not a TCP-style
1529 * socket that already has an association or there is
1530 * no peeled-off association on another socket.
1532 if ((sctp_style(sk
, TCP
) &&
1533 sctp_sstate(sk
, ESTABLISHED
)) ||
1534 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1535 err
= -EADDRNOTAVAIL
;
1540 asoc
= sctp_id2assoc(sk
, associd
);
1548 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1550 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1551 * socket that has an association in CLOSED state. This can
1552 * happen when an accepted socket has an association that is
1555 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1560 if (sinfo_flags
& SCTP_EOF
) {
1561 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1563 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1567 if (sinfo_flags
& SCTP_ABORT
) {
1569 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1575 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1576 sctp_primitive_ABORT(asoc
, chunk
);
1582 /* Do we need to create the association? */
1584 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1586 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1591 /* Check for invalid stream against the stream counts,
1592 * either the default or the user specified stream counts.
1595 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1596 /* Check against the defaults. */
1597 if (sinfo
->sinfo_stream
>=
1598 sp
->initmsg
.sinit_num_ostreams
) {
1603 /* Check against the requested. */
1604 if (sinfo
->sinfo_stream
>=
1605 sinit
->sinit_num_ostreams
) {
1613 * API 3.1.2 bind() - UDP Style Syntax
1614 * If a bind() or sctp_bindx() is not called prior to a
1615 * sendmsg() call that initiates a new association, the
1616 * system picks an ephemeral port and will choose an address
1617 * set equivalent to binding with a wildcard address.
1619 if (!ep
->base
.bind_addr
.port
) {
1620 if (sctp_autobind(sk
)) {
1626 * If an unprivileged user inherits a one-to-many
1627 * style socket with open associations on a privileged
1628 * port, it MAY be permitted to accept new associations,
1629 * but it SHOULD NOT be permitted to open new
1632 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1633 !capable(CAP_NET_BIND_SERVICE
)) {
1639 scope
= sctp_scope(&to
);
1640 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1647 /* If the SCTP_INIT ancillary data is specified, set all
1648 * the association init values accordingly.
1651 if (sinit
->sinit_num_ostreams
) {
1652 asoc
->c
.sinit_num_ostreams
=
1653 sinit
->sinit_num_ostreams
;
1655 if (sinit
->sinit_max_instreams
) {
1656 asoc
->c
.sinit_max_instreams
=
1657 sinit
->sinit_max_instreams
;
1659 if (sinit
->sinit_max_attempts
) {
1660 asoc
->max_init_attempts
1661 = sinit
->sinit_max_attempts
;
1663 if (sinit
->sinit_max_init_timeo
) {
1664 asoc
->max_init_timeo
=
1665 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1669 /* Prime the peer's transport structures. */
1670 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1675 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1682 /* ASSERT: we have a valid association at this point. */
1683 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1686 /* If the user didn't specify SNDRCVINFO, make up one with
1689 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1690 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1691 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1692 default_sinfo
.sinfo_context
= asoc
->default_context
;
1693 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1694 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1695 sinfo
= &default_sinfo
;
1698 /* API 7.1.7, the sndbuf size per association bounds the
1699 * maximum size of data that can be sent in a single send call.
1701 if (msg_len
> sk
->sk_sndbuf
) {
1706 if (asoc
->pmtu_pending
)
1707 sctp_assoc_pending_pmtu(asoc
);
1709 /* If fragmentation is disabled and the message length exceeds the
1710 * association fragmentation point, return EMSGSIZE. The I-D
1711 * does not specify what this error is, but this looks like
1714 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1720 /* Check for invalid stream. */
1721 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1727 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1728 if (!sctp_wspace(asoc
)) {
1729 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1734 /* If an address is passed with the sendto/sendmsg call, it is used
1735 * to override the primary destination address in the TCP model, or
1736 * when SCTP_ADDR_OVER flag is set in the UDP model.
1738 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1739 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1740 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1748 /* Auto-connect, if we aren't connected already. */
1749 if (sctp_state(asoc
, CLOSED
)) {
1750 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1753 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1756 /* Break the message into multiple chunks of maximum size. */
1757 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1763 /* Now send the (possibly) fragmented message. */
1764 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1765 sctp_chunk_hold(chunk
);
1767 /* Do accounting for the write space. */
1768 sctp_set_owner_w(chunk
);
1770 chunk
->transport
= chunk_tp
;
1772 /* Send it to the lower layers. Note: all chunks
1773 * must either fail or succeed. The lower layer
1774 * works that way today. Keep it that way or this
1777 err
= sctp_primitive_SEND(asoc
, chunk
);
1778 /* Did the lower layer accept the chunk? */
1780 sctp_chunk_free(chunk
);
1781 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1784 sctp_datamsg_put(datamsg
);
1790 /* If we are already past ASSOCIATE, the lower
1791 * layers are responsible for association cleanup.
1797 sctp_association_free(asoc
);
1799 sctp_release_sock(sk
);
1802 return sctp_error(sk
, msg_flags
, err
);
1809 err
= sock_error(sk
);
1819 /* This is an extended version of skb_pull() that removes the data from the
1820 * start of a skb even when data is spread across the list of skb's in the
1821 * frag_list. len specifies the total amount of data that needs to be removed.
1822 * when 'len' bytes could be removed from the skb, it returns 0.
1823 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1824 * could not be removed.
1826 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1828 struct sk_buff
*list
;
1829 int skb_len
= skb_headlen(skb
);
1832 if (len
<= skb_len
) {
1833 __skb_pull(skb
, len
);
1837 __skb_pull(skb
, skb_len
);
1839 for (list
= skb_shinfo(skb
)->frag_list
; list
; list
= list
->next
) {
1840 rlen
= sctp_skb_pull(list
, len
);
1841 skb
->len
-= (len
-rlen
);
1842 skb
->data_len
-= (len
-rlen
);
1853 /* API 3.1.3 recvmsg() - UDP Style Syntax
1855 * ssize_t recvmsg(int socket, struct msghdr *message,
1858 * socket - the socket descriptor of the endpoint.
1859 * message - pointer to the msghdr structure which contains a single
1860 * user message and possibly some ancillary data.
1862 * See Section 5 for complete description of the data
1865 * flags - flags sent or received with the user message, see Section
1866 * 5 for complete description of the flags.
1868 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1870 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1871 struct msghdr
*msg
, size_t len
, int noblock
,
1872 int flags
, int *addr_len
)
1874 struct sctp_ulpevent
*event
= NULL
;
1875 struct sctp_sock
*sp
= sctp_sk(sk
);
1876 struct sk_buff
*skb
;
1881 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1882 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1883 "len", len
, "knoblauch", noblock
,
1884 "flags", flags
, "addr_len", addr_len
);
1888 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1893 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1897 /* Get the total length of the skb including any skb's in the
1906 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1908 event
= sctp_skb2event(skb
);
1913 sock_recv_timestamp(msg
, sk
, skb
);
1914 if (sctp_ulpevent_is_notification(event
)) {
1915 msg
->msg_flags
|= MSG_NOTIFICATION
;
1916 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1918 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1921 /* Check if we allow SCTP_SNDRCVINFO. */
1922 if (sp
->subscribe
.sctp_data_io_event
)
1923 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1925 /* FIXME: we should be calling IP/IPv6 layers. */
1926 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1927 ip_cmsg_recv(msg
, skb
);
1932 /* If skb's length exceeds the user's buffer, update the skb and
1933 * push it back to the receive_queue so that the next call to
1934 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1936 if (skb_len
> copied
) {
1937 msg
->msg_flags
&= ~MSG_EOR
;
1938 if (flags
& MSG_PEEK
)
1940 sctp_skb_pull(skb
, copied
);
1941 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1943 /* When only partial message is copied to the user, increase
1944 * rwnd by that amount. If all the data in the skb is read,
1945 * rwnd is updated when the event is freed.
1947 if (!sctp_ulpevent_is_notification(event
))
1948 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
1950 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
1951 (event
->msg_flags
& MSG_EOR
))
1952 msg
->msg_flags
|= MSG_EOR
;
1954 msg
->msg_flags
&= ~MSG_EOR
;
1957 if (flags
& MSG_PEEK
) {
1958 /* Release the skb reference acquired after peeking the skb in
1959 * sctp_skb_recv_datagram().
1963 /* Free the event which includes releasing the reference to
1964 * the owner of the skb, freeing the skb and updating the
1967 sctp_ulpevent_free(event
);
1970 sctp_release_sock(sk
);
1974 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1976 * This option is a on/off flag. If enabled no SCTP message
1977 * fragmentation will be performed. Instead if a message being sent
1978 * exceeds the current PMTU size, the message will NOT be sent and
1979 * instead a error will be indicated to the user.
1981 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
1982 char __user
*optval
, int optlen
)
1986 if (optlen
< sizeof(int))
1989 if (get_user(val
, (int __user
*)optval
))
1992 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
1997 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2000 if (optlen
> sizeof(struct sctp_event_subscribe
))
2002 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2007 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2009 * This socket option is applicable to the UDP-style socket only. When
2010 * set it will cause associations that are idle for more than the
2011 * specified number of seconds to automatically close. An association
2012 * being idle is defined an association that has NOT sent or received
2013 * user data. The special value of '0' indicates that no automatic
2014 * close of any associations should be performed. The option expects an
2015 * integer defining the number of seconds of idle time before an
2016 * association is closed.
2018 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2021 struct sctp_sock
*sp
= sctp_sk(sk
);
2023 /* Applicable to UDP-style socket only */
2024 if (sctp_style(sk
, TCP
))
2026 if (optlen
!= sizeof(int))
2028 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2034 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2036 * Applications can enable or disable heartbeats for any peer address of
2037 * an association, modify an address's heartbeat interval, force a
2038 * heartbeat to be sent immediately, and adjust the address's maximum
2039 * number of retransmissions sent before an address is considered
2040 * unreachable. The following structure is used to access and modify an
2041 * address's parameters:
2043 * struct sctp_paddrparams {
2044 * sctp_assoc_t spp_assoc_id;
2045 * struct sockaddr_storage spp_address;
2046 * uint32_t spp_hbinterval;
2047 * uint16_t spp_pathmaxrxt;
2048 * uint32_t spp_pathmtu;
2049 * uint32_t spp_sackdelay;
2050 * uint32_t spp_flags;
2053 * spp_assoc_id - (one-to-many style socket) This is filled in the
2054 * application, and identifies the association for
2056 * spp_address - This specifies which address is of interest.
2057 * spp_hbinterval - This contains the value of the heartbeat interval,
2058 * in milliseconds. If a value of zero
2059 * is present in this field then no changes are to
2060 * be made to this parameter.
2061 * spp_pathmaxrxt - This contains the maximum number of
2062 * retransmissions before this address shall be
2063 * considered unreachable. If a value of zero
2064 * is present in this field then no changes are to
2065 * be made to this parameter.
2066 * spp_pathmtu - When Path MTU discovery is disabled the value
2067 * specified here will be the "fixed" path mtu.
2068 * Note that if the spp_address field is empty
2069 * then all associations on this address will
2070 * have this fixed path mtu set upon them.
2072 * spp_sackdelay - When delayed sack is enabled, this value specifies
2073 * the number of milliseconds that sacks will be delayed
2074 * for. This value will apply to all addresses of an
2075 * association if the spp_address field is empty. Note
2076 * also, that if delayed sack is enabled and this
2077 * value is set to 0, no change is made to the last
2078 * recorded delayed sack timer value.
2080 * spp_flags - These flags are used to control various features
2081 * on an association. The flag field may contain
2082 * zero or more of the following options.
2084 * SPP_HB_ENABLE - Enable heartbeats on the
2085 * specified address. Note that if the address
2086 * field is empty all addresses for the association
2087 * have heartbeats enabled upon them.
2089 * SPP_HB_DISABLE - Disable heartbeats on the
2090 * speicifed address. Note that if the address
2091 * field is empty all addresses for the association
2092 * will have their heartbeats disabled. Note also
2093 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2094 * mutually exclusive, only one of these two should
2095 * be specified. Enabling both fields will have
2096 * undetermined results.
2098 * SPP_HB_DEMAND - Request a user initiated heartbeat
2099 * to be made immediately.
2101 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2102 * heartbeat delayis to be set to the value of 0
2105 * SPP_PMTUD_ENABLE - This field will enable PMTU
2106 * discovery upon the specified address. Note that
2107 * if the address feild is empty then all addresses
2108 * on the association are effected.
2110 * SPP_PMTUD_DISABLE - This field will disable PMTU
2111 * discovery upon the specified address. Note that
2112 * if the address feild is empty then all addresses
2113 * on the association are effected. Not also that
2114 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2115 * exclusive. Enabling both will have undetermined
2118 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2119 * on delayed sack. The time specified in spp_sackdelay
2120 * is used to specify the sack delay for this address. Note
2121 * that if spp_address is empty then all addresses will
2122 * enable delayed sack and take on the sack delay
2123 * value specified in spp_sackdelay.
2124 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2125 * off delayed sack. If the spp_address field is blank then
2126 * delayed sack is disabled for the entire association. Note
2127 * also that this field is mutually exclusive to
2128 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2131 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2132 struct sctp_transport
*trans
,
2133 struct sctp_association
*asoc
,
2134 struct sctp_sock
*sp
,
2137 int sackdelay_change
)
2141 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2142 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2147 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2148 * this field is ignored. Note also that a value of zero indicates
2149 * the current setting should be left unchanged.
2151 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2153 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2154 * set. This lets us use 0 value when this flag
2157 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2158 params
->spp_hbinterval
= 0;
2160 if (params
->spp_hbinterval
||
2161 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2164 msecs_to_jiffies(params
->spp_hbinterval
);
2167 msecs_to_jiffies(params
->spp_hbinterval
);
2169 sp
->hbinterval
= params
->spp_hbinterval
;
2176 trans
->param_flags
=
2177 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2180 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2183 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2187 /* When Path MTU discovery is disabled the value specified here will
2188 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2189 * include the flag SPP_PMTUD_DISABLE for this field to have any
2192 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2194 trans
->pathmtu
= params
->spp_pathmtu
;
2195 sctp_assoc_sync_pmtu(asoc
);
2197 asoc
->pathmtu
= params
->spp_pathmtu
;
2198 sctp_frag_point(sp
, params
->spp_pathmtu
);
2200 sp
->pathmtu
= params
->spp_pathmtu
;
2206 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2207 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2208 trans
->param_flags
=
2209 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2211 sctp_transport_pmtu(trans
);
2212 sctp_assoc_sync_pmtu(asoc
);
2216 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2219 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2223 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2224 * value of this field is ignored. Note also that a value of zero
2225 * indicates the current setting should be left unchanged.
2227 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2230 msecs_to_jiffies(params
->spp_sackdelay
);
2233 msecs_to_jiffies(params
->spp_sackdelay
);
2235 sp
->sackdelay
= params
->spp_sackdelay
;
2239 if (sackdelay_change
) {
2241 trans
->param_flags
=
2242 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2246 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2250 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2255 /* Note that unless the spp_flag is set to SPP_PMTUD_ENABLE the value
2256 * of this field is ignored. Note also that a value of zero
2257 * indicates the current setting should be left unchanged.
2259 if ((params
->spp_flags
& SPP_PMTUD_ENABLE
) && params
->spp_pathmaxrxt
) {
2261 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2263 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2265 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2272 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2273 char __user
*optval
, int optlen
)
2275 struct sctp_paddrparams params
;
2276 struct sctp_transport
*trans
= NULL
;
2277 struct sctp_association
*asoc
= NULL
;
2278 struct sctp_sock
*sp
= sctp_sk(sk
);
2280 int hb_change
, pmtud_change
, sackdelay_change
;
2282 if (optlen
!= sizeof(struct sctp_paddrparams
))
2285 if (copy_from_user(¶ms
, optval
, optlen
))
2288 /* Validate flags and value parameters. */
2289 hb_change
= params
.spp_flags
& SPP_HB
;
2290 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2291 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2293 if (hb_change
== SPP_HB
||
2294 pmtud_change
== SPP_PMTUD
||
2295 sackdelay_change
== SPP_SACKDELAY
||
2296 params
.spp_sackdelay
> 500 ||
2298 && params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2301 /* If an address other than INADDR_ANY is specified, and
2302 * no transport is found, then the request is invalid.
2304 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
2305 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2306 params
.spp_assoc_id
);
2311 /* Get association, if assoc_id != 0 and the socket is a one
2312 * to many style socket, and an association was not found, then
2313 * the id was invalid.
2315 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2316 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2319 /* Heartbeat demand can only be sent on a transport or
2320 * association, but not a socket.
2322 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2325 /* Process parameters. */
2326 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2327 hb_change
, pmtud_change
,
2333 /* If changes are for association, also apply parameters to each
2336 if (!trans
&& asoc
) {
2337 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2339 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2340 hb_change
, pmtud_change
,
2349 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2351 * This option will effect the way delayed acks are performed. This
2352 * option allows you to get or set the delayed ack time, in
2353 * milliseconds. It also allows changing the delayed ack frequency.
2354 * Changing the frequency to 1 disables the delayed sack algorithm. If
2355 * the assoc_id is 0, then this sets or gets the endpoints default
2356 * values. If the assoc_id field is non-zero, then the set or get
2357 * effects the specified association for the one to many model (the
2358 * assoc_id field is ignored by the one to one model). Note that if
2359 * sack_delay or sack_freq are 0 when setting this option, then the
2360 * current values will remain unchanged.
2362 * struct sctp_sack_info {
2363 * sctp_assoc_t sack_assoc_id;
2364 * uint32_t sack_delay;
2365 * uint32_t sack_freq;
2368 * sack_assoc_id - This parameter, indicates which association the user
2369 * is performing an action upon. Note that if this field's value is
2370 * zero then the endpoints default value is changed (effecting future
2371 * associations only).
2373 * sack_delay - This parameter contains the number of milliseconds that
2374 * the user is requesting the delayed ACK timer be set to. Note that
2375 * this value is defined in the standard to be between 200 and 500
2378 * sack_freq - This parameter contains the number of packets that must
2379 * be received before a sack is sent without waiting for the delay
2380 * timer to expire. The default value for this is 2, setting this
2381 * value to 1 will disable the delayed sack algorithm.
2384 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2385 char __user
*optval
, int optlen
)
2387 struct sctp_sack_info params
;
2388 struct sctp_transport
*trans
= NULL
;
2389 struct sctp_association
*asoc
= NULL
;
2390 struct sctp_sock
*sp
= sctp_sk(sk
);
2392 if (optlen
== sizeof(struct sctp_sack_info
)) {
2393 if (copy_from_user(¶ms
, optval
, optlen
))
2396 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2398 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2399 printk(KERN_WARNING
"SCTP: Use of struct sctp_sack_info "
2400 "in delayed_ack socket option deprecated\n");
2401 printk(KERN_WARNING
"SCTP: struct sctp_sack_info instead\n");
2402 if (copy_from_user(¶ms
, optval
, optlen
))
2405 if (params
.sack_delay
== 0)
2406 params
.sack_freq
= 1;
2408 params
.sack_freq
= 0;
2412 /* Validate value parameter. */
2413 if (params
.sack_delay
> 500)
2416 /* Get association, if sack_assoc_id != 0 and the socket is a one
2417 * to many style socket, and an association was not found, then
2418 * the id was invalid.
2420 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2421 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2424 if (params
.sack_delay
) {
2427 msecs_to_jiffies(params
.sack_delay
);
2429 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2430 SPP_SACKDELAY_ENABLE
;
2432 sp
->sackdelay
= params
.sack_delay
;
2434 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2435 SPP_SACKDELAY_ENABLE
;
2439 if (params
.sack_freq
== 1) {
2442 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2443 SPP_SACKDELAY_DISABLE
;
2446 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2447 SPP_SACKDELAY_DISABLE
;
2449 } else if (params
.sack_freq
> 1) {
2451 asoc
->sackfreq
= params
.sack_freq
;
2453 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2454 SPP_SACKDELAY_ENABLE
;
2456 sp
->sackfreq
= params
.sack_freq
;
2458 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2459 SPP_SACKDELAY_ENABLE
;
2463 /* If change is for association, also apply to each transport. */
2465 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2467 if (params
.sack_delay
) {
2469 msecs_to_jiffies(params
.sack_delay
);
2470 trans
->param_flags
=
2471 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2472 SPP_SACKDELAY_ENABLE
;
2474 if (params
.sack_freq
== 1) {
2475 trans
->param_flags
=
2476 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2477 SPP_SACKDELAY_DISABLE
;
2478 } else if (params
.sack_freq
> 1) {
2479 trans
->sackfreq
= params
.sack_freq
;
2480 trans
->param_flags
=
2481 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2482 SPP_SACKDELAY_ENABLE
;
2490 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2492 * Applications can specify protocol parameters for the default association
2493 * initialization. The option name argument to setsockopt() and getsockopt()
2496 * Setting initialization parameters is effective only on an unconnected
2497 * socket (for UDP-style sockets only future associations are effected
2498 * by the change). With TCP-style sockets, this option is inherited by
2499 * sockets derived from a listener socket.
2501 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, int optlen
)
2503 struct sctp_initmsg sinit
;
2504 struct sctp_sock
*sp
= sctp_sk(sk
);
2506 if (optlen
!= sizeof(struct sctp_initmsg
))
2508 if (copy_from_user(&sinit
, optval
, optlen
))
2511 if (sinit
.sinit_num_ostreams
)
2512 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2513 if (sinit
.sinit_max_instreams
)
2514 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2515 if (sinit
.sinit_max_attempts
)
2516 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2517 if (sinit
.sinit_max_init_timeo
)
2518 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2524 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2526 * Applications that wish to use the sendto() system call may wish to
2527 * specify a default set of parameters that would normally be supplied
2528 * through the inclusion of ancillary data. This socket option allows
2529 * such an application to set the default sctp_sndrcvinfo structure.
2530 * The application that wishes to use this socket option simply passes
2531 * in to this call the sctp_sndrcvinfo structure defined in Section
2532 * 5.2.2) The input parameters accepted by this call include
2533 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2534 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2535 * to this call if the caller is using the UDP model.
2537 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2538 char __user
*optval
, int optlen
)
2540 struct sctp_sndrcvinfo info
;
2541 struct sctp_association
*asoc
;
2542 struct sctp_sock
*sp
= sctp_sk(sk
);
2544 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2546 if (copy_from_user(&info
, optval
, optlen
))
2549 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2550 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2554 asoc
->default_stream
= info
.sinfo_stream
;
2555 asoc
->default_flags
= info
.sinfo_flags
;
2556 asoc
->default_ppid
= info
.sinfo_ppid
;
2557 asoc
->default_context
= info
.sinfo_context
;
2558 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2560 sp
->default_stream
= info
.sinfo_stream
;
2561 sp
->default_flags
= info
.sinfo_flags
;
2562 sp
->default_ppid
= info
.sinfo_ppid
;
2563 sp
->default_context
= info
.sinfo_context
;
2564 sp
->default_timetolive
= info
.sinfo_timetolive
;
2570 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2572 * Requests that the local SCTP stack use the enclosed peer address as
2573 * the association primary. The enclosed address must be one of the
2574 * association peer's addresses.
2576 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2579 struct sctp_prim prim
;
2580 struct sctp_transport
*trans
;
2582 if (optlen
!= sizeof(struct sctp_prim
))
2585 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2588 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2592 sctp_assoc_set_primary(trans
->asoc
, trans
);
2598 * 7.1.5 SCTP_NODELAY
2600 * Turn on/off any Nagle-like algorithm. This means that packets are
2601 * generally sent as soon as possible and no unnecessary delays are
2602 * introduced, at the cost of more packets in the network. Expects an
2603 * integer boolean flag.
2605 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2610 if (optlen
< sizeof(int))
2612 if (get_user(val
, (int __user
*)optval
))
2615 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2621 * 7.1.1 SCTP_RTOINFO
2623 * The protocol parameters used to initialize and bound retransmission
2624 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2625 * and modify these parameters.
2626 * All parameters are time values, in milliseconds. A value of 0, when
2627 * modifying the parameters, indicates that the current value should not
2631 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, int optlen
) {
2632 struct sctp_rtoinfo rtoinfo
;
2633 struct sctp_association
*asoc
;
2635 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2638 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2641 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2643 /* Set the values to the specific association */
2644 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2648 if (rtoinfo
.srto_initial
!= 0)
2650 msecs_to_jiffies(rtoinfo
.srto_initial
);
2651 if (rtoinfo
.srto_max
!= 0)
2652 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2653 if (rtoinfo
.srto_min
!= 0)
2654 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2656 /* If there is no association or the association-id = 0
2657 * set the values to the endpoint.
2659 struct sctp_sock
*sp
= sctp_sk(sk
);
2661 if (rtoinfo
.srto_initial
!= 0)
2662 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2663 if (rtoinfo
.srto_max
!= 0)
2664 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2665 if (rtoinfo
.srto_min
!= 0)
2666 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2674 * 7.1.2 SCTP_ASSOCINFO
2676 * This option is used to tune the maximum retransmission attempts
2677 * of the association.
2678 * Returns an error if the new association retransmission value is
2679 * greater than the sum of the retransmission value of the peer.
2680 * See [SCTP] for more information.
2683 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, int optlen
)
2686 struct sctp_assocparams assocparams
;
2687 struct sctp_association
*asoc
;
2689 if (optlen
!= sizeof(struct sctp_assocparams
))
2691 if (copy_from_user(&assocparams
, optval
, optlen
))
2694 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2696 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2699 /* Set the values to the specific association */
2701 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2704 struct sctp_transport
*peer_addr
;
2706 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
2708 path_sum
+= peer_addr
->pathmaxrxt
;
2712 /* Only validate asocmaxrxt if we have more then
2713 * one path/transport. We do this because path
2714 * retransmissions are only counted when we have more
2718 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2721 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2724 if (assocparams
.sasoc_cookie_life
!= 0) {
2725 asoc
->cookie_life
.tv_sec
=
2726 assocparams
.sasoc_cookie_life
/ 1000;
2727 asoc
->cookie_life
.tv_usec
=
2728 (assocparams
.sasoc_cookie_life
% 1000)
2732 /* Set the values to the endpoint */
2733 struct sctp_sock
*sp
= sctp_sk(sk
);
2735 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2736 sp
->assocparams
.sasoc_asocmaxrxt
=
2737 assocparams
.sasoc_asocmaxrxt
;
2738 if (assocparams
.sasoc_cookie_life
!= 0)
2739 sp
->assocparams
.sasoc_cookie_life
=
2740 assocparams
.sasoc_cookie_life
;
2746 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2748 * This socket option is a boolean flag which turns on or off mapped V4
2749 * addresses. If this option is turned on and the socket is type
2750 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2751 * If this option is turned off, then no mapping will be done of V4
2752 * addresses and a user will receive both PF_INET6 and PF_INET type
2753 * addresses on the socket.
2755 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, int optlen
)
2758 struct sctp_sock
*sp
= sctp_sk(sk
);
2760 if (optlen
< sizeof(int))
2762 if (get_user(val
, (int __user
*)optval
))
2773 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2775 * This socket option specifies the maximum size to put in any outgoing
2776 * SCTP chunk. If a message is larger than this size it will be
2777 * fragmented by SCTP into the specified size. Note that the underlying
2778 * SCTP implementation may fragment into smaller sized chunks when the
2779 * PMTU of the underlying association is smaller than the value set by
2782 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, int optlen
)
2784 struct sctp_association
*asoc
;
2785 struct sctp_sock
*sp
= sctp_sk(sk
);
2788 if (optlen
< sizeof(int))
2790 if (get_user(val
, (int __user
*)optval
))
2792 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2794 sp
->user_frag
= val
;
2796 /* Update the frag_point of the existing associations. */
2797 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
2798 asoc
->frag_point
= sctp_frag_point(sp
, asoc
->pathmtu
);
2806 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2808 * Requests that the peer mark the enclosed address as the association
2809 * primary. The enclosed address must be one of the association's
2810 * locally bound addresses. The following structure is used to make a
2811 * set primary request:
2813 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2816 struct sctp_sock
*sp
;
2817 struct sctp_endpoint
*ep
;
2818 struct sctp_association
*asoc
= NULL
;
2819 struct sctp_setpeerprim prim
;
2820 struct sctp_chunk
*chunk
;
2826 if (!sctp_addip_enable
)
2829 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2832 if (copy_from_user(&prim
, optval
, optlen
))
2835 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2839 if (!asoc
->peer
.asconf_capable
)
2842 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2845 if (!sctp_state(asoc
, ESTABLISHED
))
2848 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2849 return -EADDRNOTAVAIL
;
2851 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2852 chunk
= sctp_make_asconf_set_prim(asoc
,
2853 (union sctp_addr
*)&prim
.sspp_addr
);
2857 err
= sctp_send_asconf(asoc
, chunk
);
2859 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2864 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
2867 struct sctp_setadaptation adaptation
;
2869 if (optlen
!= sizeof(struct sctp_setadaptation
))
2871 if (copy_from_user(&adaptation
, optval
, optlen
))
2874 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
2880 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2882 * The context field in the sctp_sndrcvinfo structure is normally only
2883 * used when a failed message is retrieved holding the value that was
2884 * sent down on the actual send call. This option allows the setting of
2885 * a default context on an association basis that will be received on
2886 * reading messages from the peer. This is especially helpful in the
2887 * one-2-many model for an application to keep some reference to an
2888 * internal state machine that is processing messages on the
2889 * association. Note that the setting of this value only effects
2890 * received messages from the peer and does not effect the value that is
2891 * saved with outbound messages.
2893 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
2896 struct sctp_assoc_value params
;
2897 struct sctp_sock
*sp
;
2898 struct sctp_association
*asoc
;
2900 if (optlen
!= sizeof(struct sctp_assoc_value
))
2902 if (copy_from_user(¶ms
, optval
, optlen
))
2907 if (params
.assoc_id
!= 0) {
2908 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2911 asoc
->default_rcv_context
= params
.assoc_value
;
2913 sp
->default_rcv_context
= params
.assoc_value
;
2920 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
2922 * This options will at a minimum specify if the implementation is doing
2923 * fragmented interleave. Fragmented interleave, for a one to many
2924 * socket, is when subsequent calls to receive a message may return
2925 * parts of messages from different associations. Some implementations
2926 * may allow you to turn this value on or off. If so, when turned off,
2927 * no fragment interleave will occur (which will cause a head of line
2928 * blocking amongst multiple associations sharing the same one to many
2929 * socket). When this option is turned on, then each receive call may
2930 * come from a different association (thus the user must receive data
2931 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
2932 * association each receive belongs to.
2934 * This option takes a boolean value. A non-zero value indicates that
2935 * fragmented interleave is on. A value of zero indicates that
2936 * fragmented interleave is off.
2938 * Note that it is important that an implementation that allows this
2939 * option to be turned on, have it off by default. Otherwise an unaware
2940 * application using the one to many model may become confused and act
2943 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
2944 char __user
*optval
,
2949 if (optlen
!= sizeof(int))
2951 if (get_user(val
, (int __user
*)optval
))
2954 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
2960 * 7.1.25. Set or Get the sctp partial delivery point
2961 * (SCTP_PARTIAL_DELIVERY_POINT)
2962 * This option will set or get the SCTP partial delivery point. This
2963 * point is the size of a message where the partial delivery API will be
2964 * invoked to help free up rwnd space for the peer. Setting this to a
2965 * lower value will cause partial delivery's to happen more often. The
2966 * calls argument is an integer that sets or gets the partial delivery
2969 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
2970 char __user
*optval
,
2975 if (optlen
!= sizeof(u32
))
2977 if (get_user(val
, (int __user
*)optval
))
2980 sctp_sk(sk
)->pd_point
= val
;
2982 return 0; /* is this the right error code? */
2986 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
2988 * This option will allow a user to change the maximum burst of packets
2989 * that can be emitted by this association. Note that the default value
2990 * is 4, and some implementations may restrict this setting so that it
2991 * can only be lowered.
2993 * NOTE: This text doesn't seem right. Do this on a socket basis with
2994 * future associations inheriting the socket value.
2996 static int sctp_setsockopt_maxburst(struct sock
*sk
,
2997 char __user
*optval
,
3000 struct sctp_assoc_value params
;
3001 struct sctp_sock
*sp
;
3002 struct sctp_association
*asoc
;
3006 if (optlen
< sizeof(int))
3009 if (optlen
== sizeof(int)) {
3011 "SCTP: Use of int in max_burst socket option deprecated\n");
3013 "SCTP: Use struct sctp_assoc_value instead\n");
3014 if (copy_from_user(&val
, optval
, optlen
))
3016 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3017 if (copy_from_user(¶ms
, optval
, optlen
))
3019 val
= params
.assoc_value
;
3020 assoc_id
= params
.assoc_id
;
3026 if (assoc_id
!= 0) {
3027 asoc
= sctp_id2assoc(sk
, assoc_id
);
3030 asoc
->max_burst
= val
;
3032 sp
->max_burst
= val
;
3038 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3040 * This set option adds a chunk type that the user is requesting to be
3041 * received only in an authenticated way. Changes to the list of chunks
3042 * will only effect future associations on the socket.
3044 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
3045 char __user
*optval
,
3048 struct sctp_authchunk val
;
3050 if (optlen
!= sizeof(struct sctp_authchunk
))
3052 if (copy_from_user(&val
, optval
, optlen
))
3055 switch (val
.sauth_chunk
) {
3057 case SCTP_CID_INIT_ACK
:
3058 case SCTP_CID_SHUTDOWN_COMPLETE
:
3063 /* add this chunk id to the endpoint */
3064 return sctp_auth_ep_add_chunkid(sctp_sk(sk
)->ep
, val
.sauth_chunk
);
3068 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3070 * This option gets or sets the list of HMAC algorithms that the local
3071 * endpoint requires the peer to use.
3073 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
3074 char __user
*optval
,
3077 struct sctp_hmacalgo
*hmacs
;
3080 if (optlen
< sizeof(struct sctp_hmacalgo
))
3083 hmacs
= kmalloc(optlen
, GFP_KERNEL
);
3087 if (copy_from_user(hmacs
, optval
, optlen
)) {
3092 if (hmacs
->shmac_num_idents
== 0 ||
3093 hmacs
->shmac_num_idents
> SCTP_AUTH_NUM_HMACS
) {
3098 err
= sctp_auth_ep_set_hmacs(sctp_sk(sk
)->ep
, hmacs
);
3105 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3107 * This option will set a shared secret key which is used to build an
3108 * association shared key.
3110 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3111 char __user
*optval
,
3114 struct sctp_authkey
*authkey
;
3115 struct sctp_association
*asoc
;
3118 if (optlen
<= sizeof(struct sctp_authkey
))
3121 authkey
= kmalloc(optlen
, GFP_KERNEL
);
3125 if (copy_from_user(authkey
, optval
, optlen
)) {
3130 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3131 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3136 ret
= sctp_auth_set_key(sctp_sk(sk
)->ep
, asoc
, authkey
);
3143 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3145 * This option will get or set the active shared key to be used to build
3146 * the association shared key.
3148 static int sctp_setsockopt_active_key(struct sock
*sk
,
3149 char __user
*optval
,
3152 struct sctp_authkeyid val
;
3153 struct sctp_association
*asoc
;
3155 if (optlen
!= sizeof(struct sctp_authkeyid
))
3157 if (copy_from_user(&val
, optval
, optlen
))
3160 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3161 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3164 return sctp_auth_set_active_key(sctp_sk(sk
)->ep
, asoc
,
3165 val
.scact_keynumber
);
3169 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3171 * This set option will delete a shared secret key from use.
3173 static int sctp_setsockopt_del_key(struct sock
*sk
,
3174 char __user
*optval
,
3177 struct sctp_authkeyid val
;
3178 struct sctp_association
*asoc
;
3180 if (optlen
!= sizeof(struct sctp_authkeyid
))
3182 if (copy_from_user(&val
, optval
, optlen
))
3185 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3186 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3189 return sctp_auth_del_key_id(sctp_sk(sk
)->ep
, asoc
,
3190 val
.scact_keynumber
);
3195 /* API 6.2 setsockopt(), getsockopt()
3197 * Applications use setsockopt() and getsockopt() to set or retrieve
3198 * socket options. Socket options are used to change the default
3199 * behavior of sockets calls. They are described in Section 7.
3203 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3204 * int __user *optlen);
3205 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3208 * sd - the socket descript.
3209 * level - set to IPPROTO_SCTP for all SCTP options.
3210 * optname - the option name.
3211 * optval - the buffer to store the value of the option.
3212 * optlen - the size of the buffer.
3214 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3215 char __user
*optval
, int optlen
)
3219 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3222 /* I can hardly begin to describe how wrong this is. This is
3223 * so broken as to be worse than useless. The API draft
3224 * REALLY is NOT helpful here... I am not convinced that the
3225 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3226 * are at all well-founded.
3228 if (level
!= SOL_SCTP
) {
3229 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3230 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3237 case SCTP_SOCKOPT_BINDX_ADD
:
3238 /* 'optlen' is the size of the addresses buffer. */
3239 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3240 optlen
, SCTP_BINDX_ADD_ADDR
);
3243 case SCTP_SOCKOPT_BINDX_REM
:
3244 /* 'optlen' is the size of the addresses buffer. */
3245 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3246 optlen
, SCTP_BINDX_REM_ADDR
);
3249 case SCTP_SOCKOPT_CONNECTX_OLD
:
3250 /* 'optlen' is the size of the addresses buffer. */
3251 retval
= sctp_setsockopt_connectx_old(sk
,
3252 (struct sockaddr __user
*)optval
,
3256 case SCTP_SOCKOPT_CONNECTX
:
3257 /* 'optlen' is the size of the addresses buffer. */
3258 retval
= sctp_setsockopt_connectx(sk
,
3259 (struct sockaddr __user
*)optval
,
3263 case SCTP_DISABLE_FRAGMENTS
:
3264 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3268 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3271 case SCTP_AUTOCLOSE
:
3272 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3275 case SCTP_PEER_ADDR_PARAMS
:
3276 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3279 case SCTP_DELAYED_ACK
:
3280 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3282 case SCTP_PARTIAL_DELIVERY_POINT
:
3283 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3287 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3289 case SCTP_DEFAULT_SEND_PARAM
:
3290 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3293 case SCTP_PRIMARY_ADDR
:
3294 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3296 case SCTP_SET_PEER_PRIMARY_ADDR
:
3297 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3300 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3303 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3305 case SCTP_ASSOCINFO
:
3306 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3308 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3309 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3312 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3314 case SCTP_ADAPTATION_LAYER
:
3315 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3318 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3320 case SCTP_FRAGMENT_INTERLEAVE
:
3321 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3323 case SCTP_MAX_BURST
:
3324 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3326 case SCTP_AUTH_CHUNK
:
3327 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3329 case SCTP_HMAC_IDENT
:
3330 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3333 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3335 case SCTP_AUTH_ACTIVE_KEY
:
3336 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3338 case SCTP_AUTH_DELETE_KEY
:
3339 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3342 retval
= -ENOPROTOOPT
;
3346 sctp_release_sock(sk
);
3352 /* API 3.1.6 connect() - UDP Style Syntax
3354 * An application may use the connect() call in the UDP model to initiate an
3355 * association without sending data.
3359 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3361 * sd: the socket descriptor to have a new association added to.
3363 * nam: the address structure (either struct sockaddr_in or struct
3364 * sockaddr_in6 defined in RFC2553 [7]).
3366 * len: the size of the address.
3368 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3376 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3377 __func__
, sk
, addr
, addr_len
);
3379 /* Validate addr_len before calling common connect/connectx routine. */
3380 af
= sctp_get_af_specific(addr
->sa_family
);
3381 if (!af
|| addr_len
< af
->sockaddr_len
) {
3384 /* Pass correct addr len to common routine (so it knows there
3385 * is only one address being passed.
3387 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
3390 sctp_release_sock(sk
);
3394 /* FIXME: Write comments. */
3395 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
3397 return -EOPNOTSUPP
; /* STUB */
3400 /* 4.1.4 accept() - TCP Style Syntax
3402 * Applications use accept() call to remove an established SCTP
3403 * association from the accept queue of the endpoint. A new socket
3404 * descriptor will be returned from accept() to represent the newly
3405 * formed association.
3407 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3409 struct sctp_sock
*sp
;
3410 struct sctp_endpoint
*ep
;
3411 struct sock
*newsk
= NULL
;
3412 struct sctp_association
*asoc
;
3421 if (!sctp_style(sk
, TCP
)) {
3422 error
= -EOPNOTSUPP
;
3426 if (!sctp_sstate(sk
, LISTENING
)) {
3431 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3433 error
= sctp_wait_for_accept(sk
, timeo
);
3437 /* We treat the list of associations on the endpoint as the accept
3438 * queue and pick the first association on the list.
3440 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3442 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3448 /* Populate the fields of the newsk from the oldsk and migrate the
3449 * asoc to the newsk.
3451 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3454 sctp_release_sock(sk
);
3459 /* The SCTP ioctl handler. */
3460 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3462 return -ENOIOCTLCMD
;
3465 /* This is the function which gets called during socket creation to
3466 * initialized the SCTP-specific portion of the sock.
3467 * The sock structure should already be zero-filled memory.
3469 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
3471 struct sctp_endpoint
*ep
;
3472 struct sctp_sock
*sp
;
3474 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3478 /* Initialize the SCTP per socket area. */
3479 switch (sk
->sk_type
) {
3480 case SOCK_SEQPACKET
:
3481 sp
->type
= SCTP_SOCKET_UDP
;
3484 sp
->type
= SCTP_SOCKET_TCP
;
3487 return -ESOCKTNOSUPPORT
;
3490 /* Initialize default send parameters. These parameters can be
3491 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3493 sp
->default_stream
= 0;
3494 sp
->default_ppid
= 0;
3495 sp
->default_flags
= 0;
3496 sp
->default_context
= 0;
3497 sp
->default_timetolive
= 0;
3499 sp
->default_rcv_context
= 0;
3500 sp
->max_burst
= sctp_max_burst
;
3502 /* Initialize default setup parameters. These parameters
3503 * can be modified with the SCTP_INITMSG socket option or
3504 * overridden by the SCTP_INIT CMSG.
3506 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3507 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3508 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3509 sp
->initmsg
.sinit_max_init_timeo
= sctp_rto_max
;
3511 /* Initialize default RTO related parameters. These parameters can
3512 * be modified for with the SCTP_RTOINFO socket option.
3514 sp
->rtoinfo
.srto_initial
= sctp_rto_initial
;
3515 sp
->rtoinfo
.srto_max
= sctp_rto_max
;
3516 sp
->rtoinfo
.srto_min
= sctp_rto_min
;
3518 /* Initialize default association related parameters. These parameters
3519 * can be modified with the SCTP_ASSOCINFO socket option.
3521 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3522 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3523 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3524 sp
->assocparams
.sasoc_local_rwnd
= 0;
3525 sp
->assocparams
.sasoc_cookie_life
= sctp_valid_cookie_life
;
3527 /* Initialize default event subscriptions. By default, all the
3530 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3532 /* Default Peer Address Parameters. These defaults can
3533 * be modified via SCTP_PEER_ADDR_PARAMS
3535 sp
->hbinterval
= sctp_hb_interval
;
3536 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3537 sp
->pathmtu
= 0; // allow default discovery
3538 sp
->sackdelay
= sctp_sack_timeout
;
3540 sp
->param_flags
= SPP_HB_ENABLE
|
3542 SPP_SACKDELAY_ENABLE
;
3544 /* If enabled no SCTP message fragmentation will be performed.
3545 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3547 sp
->disable_fragments
= 0;
3549 /* Enable Nagle algorithm by default. */
3552 /* Enable by default. */
3555 /* Auto-close idle associations after the configured
3556 * number of seconds. A value of 0 disables this
3557 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3558 * for UDP-style sockets only.
3562 /* User specified fragmentation limit. */
3565 sp
->adaptation_ind
= 0;
3567 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3569 /* Control variables for partial data delivery. */
3570 atomic_set(&sp
->pd_mode
, 0);
3571 skb_queue_head_init(&sp
->pd_lobby
);
3572 sp
->frag_interleave
= 0;
3574 /* Create a per socket endpoint structure. Even if we
3575 * change the data structure relationships, this may still
3576 * be useful for storing pre-connect address information.
3578 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3585 SCTP_DBG_OBJCNT_INC(sock
);
3586 atomic_inc(&sctp_sockets_allocated
);
3590 /* Cleanup any SCTP per socket resources. */
3591 SCTP_STATIC
int sctp_destroy_sock(struct sock
*sk
)
3593 struct sctp_endpoint
*ep
;
3595 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3597 /* Release our hold on the endpoint. */
3598 ep
= sctp_sk(sk
)->ep
;
3599 sctp_endpoint_free(ep
);
3600 atomic_dec(&sctp_sockets_allocated
);
3604 /* API 4.1.7 shutdown() - TCP Style Syntax
3605 * int shutdown(int socket, int how);
3607 * sd - the socket descriptor of the association to be closed.
3608 * how - Specifies the type of shutdown. The values are
3611 * Disables further receive operations. No SCTP
3612 * protocol action is taken.
3614 * Disables further send operations, and initiates
3615 * the SCTP shutdown sequence.
3617 * Disables further send and receive operations
3618 * and initiates the SCTP shutdown sequence.
3620 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3622 struct sctp_endpoint
*ep
;
3623 struct sctp_association
*asoc
;
3625 if (!sctp_style(sk
, TCP
))
3628 if (how
& SEND_SHUTDOWN
) {
3629 ep
= sctp_sk(sk
)->ep
;
3630 if (!list_empty(&ep
->asocs
)) {
3631 asoc
= list_entry(ep
->asocs
.next
,
3632 struct sctp_association
, asocs
);
3633 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3638 /* 7.2.1 Association Status (SCTP_STATUS)
3640 * Applications can retrieve current status information about an
3641 * association, including association state, peer receiver window size,
3642 * number of unacked data chunks, and number of data chunks pending
3643 * receipt. This information is read-only.
3645 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3646 char __user
*optval
,
3649 struct sctp_status status
;
3650 struct sctp_association
*asoc
= NULL
;
3651 struct sctp_transport
*transport
;
3652 sctp_assoc_t associd
;
3655 if (len
< sizeof(status
)) {
3660 len
= sizeof(status
);
3661 if (copy_from_user(&status
, optval
, len
)) {
3666 associd
= status
.sstat_assoc_id
;
3667 asoc
= sctp_id2assoc(sk
, associd
);
3673 transport
= asoc
->peer
.primary_path
;
3675 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3676 status
.sstat_state
= asoc
->state
;
3677 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3678 status
.sstat_unackdata
= asoc
->unack_data
;
3680 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3681 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3682 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3683 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3684 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3685 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
3686 transport
->af_specific
->sockaddr_len
);
3687 /* Map ipv4 address into v4-mapped-on-v6 address. */
3688 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3689 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3690 status
.sstat_primary
.spinfo_state
= transport
->state
;
3691 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3692 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3693 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3694 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3696 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3697 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3699 if (put_user(len
, optlen
)) {
3704 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3705 len
, status
.sstat_state
, status
.sstat_rwnd
,
3706 status
.sstat_assoc_id
);
3708 if (copy_to_user(optval
, &status
, len
)) {
3718 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3720 * Applications can retrieve information about a specific peer address
3721 * of an association, including its reachability state, congestion
3722 * window, and retransmission timer values. This information is
3725 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3726 char __user
*optval
,
3729 struct sctp_paddrinfo pinfo
;
3730 struct sctp_transport
*transport
;
3733 if (len
< sizeof(pinfo
)) {
3738 len
= sizeof(pinfo
);
3739 if (copy_from_user(&pinfo
, optval
, len
)) {
3744 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3745 pinfo
.spinfo_assoc_id
);
3749 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3750 pinfo
.spinfo_state
= transport
->state
;
3751 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3752 pinfo
.spinfo_srtt
= transport
->srtt
;
3753 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3754 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3756 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3757 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3759 if (put_user(len
, optlen
)) {
3764 if (copy_to_user(optval
, &pinfo
, len
)) {
3773 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3775 * This option is a on/off flag. If enabled no SCTP message
3776 * fragmentation will be performed. Instead if a message being sent
3777 * exceeds the current PMTU size, the message will NOT be sent and
3778 * instead a error will be indicated to the user.
3780 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3781 char __user
*optval
, int __user
*optlen
)
3785 if (len
< sizeof(int))
3789 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3790 if (put_user(len
, optlen
))
3792 if (copy_to_user(optval
, &val
, len
))
3797 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3799 * This socket option is used to specify various notifications and
3800 * ancillary data the user wishes to receive.
3802 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
3805 if (len
< sizeof(struct sctp_event_subscribe
))
3807 len
= sizeof(struct sctp_event_subscribe
);
3808 if (put_user(len
, optlen
))
3810 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
3815 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3817 * This socket option is applicable to the UDP-style socket only. When
3818 * set it will cause associations that are idle for more than the
3819 * specified number of seconds to automatically close. An association
3820 * being idle is defined an association that has NOT sent or received
3821 * user data. The special value of '0' indicates that no automatic
3822 * close of any associations should be performed. The option expects an
3823 * integer defining the number of seconds of idle time before an
3824 * association is closed.
3826 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3828 /* Applicable to UDP-style socket only */
3829 if (sctp_style(sk
, TCP
))
3831 if (len
< sizeof(int))
3834 if (put_user(len
, optlen
))
3836 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
3841 /* Helper routine to branch off an association to a new socket. */
3842 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3843 struct socket
**sockp
)
3845 struct sock
*sk
= asoc
->base
.sk
;
3846 struct socket
*sock
;
3847 struct inet_sock
*inetsk
;
3851 /* An association cannot be branched off from an already peeled-off
3852 * socket, nor is this supported for tcp style sockets.
3854 if (!sctp_style(sk
, UDP
))
3857 /* Create a new socket. */
3858 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
3862 /* Populate the fields of the newsk from the oldsk and migrate the
3863 * asoc to the newsk.
3865 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
3867 /* Make peeled-off sockets more like 1-1 accepted sockets.
3868 * Set the daddr and initialize id to something more random
3870 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
3871 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
3872 inetsk
= inet_sk(sock
->sk
);
3873 inetsk
->id
= asoc
->next_tsn
^ jiffies
;
3880 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3882 sctp_peeloff_arg_t peeloff
;
3883 struct socket
*newsock
;
3885 struct sctp_association
*asoc
;
3887 if (len
< sizeof(sctp_peeloff_arg_t
))
3889 len
= sizeof(sctp_peeloff_arg_t
);
3890 if (copy_from_user(&peeloff
, optval
, len
))
3893 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
3899 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__
, sk
, asoc
);
3901 retval
= sctp_do_peeloff(asoc
, &newsock
);
3905 /* Map the socket to an unused fd that can be returned to the user. */
3906 retval
= sock_map_fd(newsock
);
3908 sock_release(newsock
);
3912 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3913 __func__
, sk
, asoc
, newsock
->sk
, retval
);
3915 /* Return the fd mapped to the new socket. */
3916 peeloff
.sd
= retval
;
3917 if (put_user(len
, optlen
))
3919 if (copy_to_user(optval
, &peeloff
, len
))
3926 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3928 * Applications can enable or disable heartbeats for any peer address of
3929 * an association, modify an address's heartbeat interval, force a
3930 * heartbeat to be sent immediately, and adjust the address's maximum
3931 * number of retransmissions sent before an address is considered
3932 * unreachable. The following structure is used to access and modify an
3933 * address's parameters:
3935 * struct sctp_paddrparams {
3936 * sctp_assoc_t spp_assoc_id;
3937 * struct sockaddr_storage spp_address;
3938 * uint32_t spp_hbinterval;
3939 * uint16_t spp_pathmaxrxt;
3940 * uint32_t spp_pathmtu;
3941 * uint32_t spp_sackdelay;
3942 * uint32_t spp_flags;
3945 * spp_assoc_id - (one-to-many style socket) This is filled in the
3946 * application, and identifies the association for
3948 * spp_address - This specifies which address is of interest.
3949 * spp_hbinterval - This contains the value of the heartbeat interval,
3950 * in milliseconds. If a value of zero
3951 * is present in this field then no changes are to
3952 * be made to this parameter.
3953 * spp_pathmaxrxt - This contains the maximum number of
3954 * retransmissions before this address shall be
3955 * considered unreachable. If a value of zero
3956 * is present in this field then no changes are to
3957 * be made to this parameter.
3958 * spp_pathmtu - When Path MTU discovery is disabled the value
3959 * specified here will be the "fixed" path mtu.
3960 * Note that if the spp_address field is empty
3961 * then all associations on this address will
3962 * have this fixed path mtu set upon them.
3964 * spp_sackdelay - When delayed sack is enabled, this value specifies
3965 * the number of milliseconds that sacks will be delayed
3966 * for. This value will apply to all addresses of an
3967 * association if the spp_address field is empty. Note
3968 * also, that if delayed sack is enabled and this
3969 * value is set to 0, no change is made to the last
3970 * recorded delayed sack timer value.
3972 * spp_flags - These flags are used to control various features
3973 * on an association. The flag field may contain
3974 * zero or more of the following options.
3976 * SPP_HB_ENABLE - Enable heartbeats on the
3977 * specified address. Note that if the address
3978 * field is empty all addresses for the association
3979 * have heartbeats enabled upon them.
3981 * SPP_HB_DISABLE - Disable heartbeats on the
3982 * speicifed address. Note that if the address
3983 * field is empty all addresses for the association
3984 * will have their heartbeats disabled. Note also
3985 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
3986 * mutually exclusive, only one of these two should
3987 * be specified. Enabling both fields will have
3988 * undetermined results.
3990 * SPP_HB_DEMAND - Request a user initiated heartbeat
3991 * to be made immediately.
3993 * SPP_PMTUD_ENABLE - This field will enable PMTU
3994 * discovery upon the specified address. Note that
3995 * if the address feild is empty then all addresses
3996 * on the association are effected.
3998 * SPP_PMTUD_DISABLE - This field will disable PMTU
3999 * discovery upon the specified address. Note that
4000 * if the address feild is empty then all addresses
4001 * on the association are effected. Not also that
4002 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4003 * exclusive. Enabling both will have undetermined
4006 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4007 * on delayed sack. The time specified in spp_sackdelay
4008 * is used to specify the sack delay for this address. Note
4009 * that if spp_address is empty then all addresses will
4010 * enable delayed sack and take on the sack delay
4011 * value specified in spp_sackdelay.
4012 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4013 * off delayed sack. If the spp_address field is blank then
4014 * delayed sack is disabled for the entire association. Note
4015 * also that this field is mutually exclusive to
4016 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4019 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
4020 char __user
*optval
, int __user
*optlen
)
4022 struct sctp_paddrparams params
;
4023 struct sctp_transport
*trans
= NULL
;
4024 struct sctp_association
*asoc
= NULL
;
4025 struct sctp_sock
*sp
= sctp_sk(sk
);
4027 if (len
< sizeof(struct sctp_paddrparams
))
4029 len
= sizeof(struct sctp_paddrparams
);
4030 if (copy_from_user(¶ms
, optval
, len
))
4033 /* If an address other than INADDR_ANY is specified, and
4034 * no transport is found, then the request is invalid.
4036 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
4037 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
4038 params
.spp_assoc_id
);
4040 SCTP_DEBUG_PRINTK("Failed no transport\n");
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
.spp_assoc_id
);
4050 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
4051 SCTP_DEBUG_PRINTK("Failed no association\n");
4056 /* Fetch transport values. */
4057 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
4058 params
.spp_pathmtu
= trans
->pathmtu
;
4059 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
4060 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
4062 /*draft-11 doesn't say what to return in spp_flags*/
4063 params
.spp_flags
= trans
->param_flags
;
4065 /* Fetch association values. */
4066 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
4067 params
.spp_pathmtu
= asoc
->pathmtu
;
4068 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
4069 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
4071 /*draft-11 doesn't say what to return in spp_flags*/
4072 params
.spp_flags
= asoc
->param_flags
;
4074 /* Fetch socket values. */
4075 params
.spp_hbinterval
= sp
->hbinterval
;
4076 params
.spp_pathmtu
= sp
->pathmtu
;
4077 params
.spp_sackdelay
= sp
->sackdelay
;
4078 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
4080 /*draft-11 doesn't say what to return in spp_flags*/
4081 params
.spp_flags
= sp
->param_flags
;
4084 if (copy_to_user(optval
, ¶ms
, len
))
4087 if (put_user(len
, optlen
))
4094 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4096 * This option will effect the way delayed acks are performed. This
4097 * option allows you to get or set the delayed ack time, in
4098 * milliseconds. It also allows changing the delayed ack frequency.
4099 * Changing the frequency to 1 disables the delayed sack algorithm. If
4100 * the assoc_id is 0, then this sets or gets the endpoints default
4101 * values. If the assoc_id field is non-zero, then the set or get
4102 * effects the specified association for the one to many model (the
4103 * assoc_id field is ignored by the one to one model). Note that if
4104 * sack_delay or sack_freq are 0 when setting this option, then the
4105 * current values will remain unchanged.
4107 * struct sctp_sack_info {
4108 * sctp_assoc_t sack_assoc_id;
4109 * uint32_t sack_delay;
4110 * uint32_t sack_freq;
4113 * sack_assoc_id - This parameter, indicates which association the user
4114 * is performing an action upon. Note that if this field's value is
4115 * zero then the endpoints default value is changed (effecting future
4116 * associations only).
4118 * sack_delay - This parameter contains the number of milliseconds that
4119 * the user is requesting the delayed ACK timer be set to. Note that
4120 * this value is defined in the standard to be between 200 and 500
4123 * sack_freq - This parameter contains the number of packets that must
4124 * be received before a sack is sent without waiting for the delay
4125 * timer to expire. The default value for this is 2, setting this
4126 * value to 1 will disable the delayed sack algorithm.
4128 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
4129 char __user
*optval
,
4132 struct sctp_sack_info params
;
4133 struct sctp_association
*asoc
= NULL
;
4134 struct sctp_sock
*sp
= sctp_sk(sk
);
4136 if (len
>= sizeof(struct sctp_sack_info
)) {
4137 len
= sizeof(struct sctp_sack_info
);
4139 if (copy_from_user(¶ms
, optval
, len
))
4141 } else if (len
== sizeof(struct sctp_assoc_value
)) {
4142 printk(KERN_WARNING
"SCTP: Use of struct sctp_sack_info "
4143 "in delayed_ack socket option deprecated\n");
4144 printk(KERN_WARNING
"SCTP: struct sctp_sack_info instead\n");
4145 if (copy_from_user(¶ms
, optval
, len
))
4150 /* Get association, if sack_assoc_id != 0 and the socket is a one
4151 * to many style socket, and an association was not found, then
4152 * the id was invalid.
4154 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
4155 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
4159 /* Fetch association values. */
4160 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4161 params
.sack_delay
= jiffies_to_msecs(
4163 params
.sack_freq
= asoc
->sackfreq
;
4166 params
.sack_delay
= 0;
4167 params
.sack_freq
= 1;
4170 /* Fetch socket values. */
4171 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4172 params
.sack_delay
= sp
->sackdelay
;
4173 params
.sack_freq
= sp
->sackfreq
;
4175 params
.sack_delay
= 0;
4176 params
.sack_freq
= 1;
4180 if (copy_to_user(optval
, ¶ms
, len
))
4183 if (put_user(len
, optlen
))
4189 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4191 * Applications can specify protocol parameters for the default association
4192 * initialization. The option name argument to setsockopt() and getsockopt()
4195 * Setting initialization parameters is effective only on an unconnected
4196 * socket (for UDP-style sockets only future associations are effected
4197 * by the change). With TCP-style sockets, this option is inherited by
4198 * sockets derived from a listener socket.
4200 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4202 if (len
< sizeof(struct sctp_initmsg
))
4204 len
= sizeof(struct sctp_initmsg
);
4205 if (put_user(len
, optlen
))
4207 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
4212 static int sctp_getsockopt_peer_addrs_num_old(struct sock
*sk
, int len
,
4213 char __user
*optval
,
4217 struct sctp_association
*asoc
;
4218 struct list_head
*pos
;
4221 if (len
< sizeof(sctp_assoc_t
))
4224 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
4227 /* For UDP-style sockets, id specifies the association to query. */
4228 asoc
= sctp_id2assoc(sk
, id
);
4232 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4240 * Old API for getting list of peer addresses. Does not work for 32-bit
4241 * programs running on a 64-bit kernel
4243 static int sctp_getsockopt_peer_addrs_old(struct sock
*sk
, int len
,
4244 char __user
*optval
,
4247 struct sctp_association
*asoc
;
4249 struct sctp_getaddrs_old getaddrs
;
4250 struct sctp_transport
*from
;
4252 union sctp_addr temp
;
4253 struct sctp_sock
*sp
= sctp_sk(sk
);
4256 if (len
< sizeof(struct sctp_getaddrs_old
))
4259 len
= sizeof(struct sctp_getaddrs_old
);
4261 if (copy_from_user(&getaddrs
, optval
, len
))
4264 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
4266 /* For UDP-style sockets, id specifies the association to query. */
4267 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4271 to
= (void __user
*)getaddrs
.addrs
;
4272 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
4274 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4275 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4276 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
4277 if (copy_to_user(to
, &temp
, addrlen
))
4281 if (cnt
>= getaddrs
.addr_num
) break;
4283 getaddrs
.addr_num
= cnt
;
4284 if (put_user(len
, optlen
))
4286 if (copy_to_user(optval
, &getaddrs
, len
))
4292 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4293 char __user
*optval
, int __user
*optlen
)
4295 struct sctp_association
*asoc
;
4297 struct sctp_getaddrs getaddrs
;
4298 struct sctp_transport
*from
;
4300 union sctp_addr temp
;
4301 struct sctp_sock
*sp
= sctp_sk(sk
);
4306 if (len
< sizeof(struct sctp_getaddrs
))
4309 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4312 /* For UDP-style sockets, id specifies the association to query. */
4313 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4317 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4318 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4320 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
4322 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4323 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4324 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
4325 if (space_left
< addrlen
)
4327 if (copy_to_user(to
, &temp
, addrlen
))
4331 space_left
-= addrlen
;
4334 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4336 bytes_copied
= ((char __user
*)to
) - optval
;
4337 if (put_user(bytes_copied
, optlen
))
4343 static int sctp_getsockopt_local_addrs_num_old(struct sock
*sk
, int len
,
4344 char __user
*optval
,
4348 struct sctp_bind_addr
*bp
;
4349 struct sctp_association
*asoc
;
4350 struct sctp_sockaddr_entry
*addr
;
4353 if (len
< sizeof(sctp_assoc_t
))
4356 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
4360 * For UDP-style sockets, id specifies the association to query.
4361 * If the id field is set to the value '0' then the locally bound
4362 * addresses are returned without regard to any particular
4366 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4368 asoc
= sctp_id2assoc(sk
, id
);
4371 bp
= &asoc
->base
.bind_addr
;
4374 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
4375 * addresses from the global local address list.
4377 if (sctp_list_single_entry(&bp
->address_list
)) {
4378 addr
= list_entry(bp
->address_list
.next
,
4379 struct sctp_sockaddr_entry
, list
);
4380 if (sctp_is_any(&addr
->a
)) {
4382 list_for_each_entry_rcu(addr
,
4383 &sctp_local_addr_list
, list
) {
4387 if ((PF_INET
== sk
->sk_family
) &&
4388 (AF_INET6
== addr
->a
.sa
.sa_family
))
4400 /* Protection on the bound address list is not needed,
4401 * since in the socket option context we hold the socket lock,
4402 * so there is no way that the bound address list can change.
4404 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4411 /* Helper function that copies local addresses to user and returns the number
4412 * of addresses copied.
4414 static int sctp_copy_laddrs_old(struct sock
*sk
, __u16 port
,
4415 int max_addrs
, void *to
,
4418 struct sctp_sockaddr_entry
*addr
;
4419 union sctp_addr temp
;
4424 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
4428 if ((PF_INET
== sk
->sk_family
) &&
4429 (AF_INET6
== addr
->a
.sa
.sa_family
))
4431 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4432 if (!temp
.v4
.sin_port
)
4433 temp
.v4
.sin_port
= htons(port
);
4435 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4437 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4438 memcpy(to
, &temp
, addrlen
);
4441 *bytes_copied
+= addrlen
;
4443 if (cnt
>= max_addrs
) break;
4450 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4451 size_t space_left
, int *bytes_copied
)
4453 struct sctp_sockaddr_entry
*addr
;
4454 union sctp_addr temp
;
4459 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
4463 if ((PF_INET
== sk
->sk_family
) &&
4464 (AF_INET6
== addr
->a
.sa
.sa_family
))
4466 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4467 if (!temp
.v4
.sin_port
)
4468 temp
.v4
.sin_port
= htons(port
);
4470 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4472 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4473 if (space_left
< addrlen
) {
4477 memcpy(to
, &temp
, addrlen
);
4481 space_left
-= addrlen
;
4482 *bytes_copied
+= addrlen
;
4489 /* Old API for getting list of local addresses. Does not work for 32-bit
4490 * programs running on a 64-bit kernel
4492 static int sctp_getsockopt_local_addrs_old(struct sock
*sk
, int len
,
4493 char __user
*optval
, int __user
*optlen
)
4495 struct sctp_bind_addr
*bp
;
4496 struct sctp_association
*asoc
;
4498 struct sctp_getaddrs_old getaddrs
;
4499 struct sctp_sockaddr_entry
*addr
;
4501 union sctp_addr temp
;
4502 struct sctp_sock
*sp
= sctp_sk(sk
);
4507 int bytes_copied
= 0;
4509 if (len
< sizeof(struct sctp_getaddrs_old
))
4512 len
= sizeof(struct sctp_getaddrs_old
);
4513 if (copy_from_user(&getaddrs
, optval
, len
))
4516 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
4518 * For UDP-style sockets, id specifies the association to query.
4519 * If the id field is set to the value '0' then the locally bound
4520 * addresses are returned without regard to any particular
4523 if (0 == getaddrs
.assoc_id
) {
4524 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4526 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4529 bp
= &asoc
->base
.bind_addr
;
4532 to
= getaddrs
.addrs
;
4534 /* Allocate space for a local instance of packed array to hold all
4535 * the data. We store addresses here first and then put write them
4536 * to the user in one shot.
4538 addrs
= kmalloc(sizeof(union sctp_addr
) * getaddrs
.addr_num
,
4543 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4544 * addresses from the global local address list.
4546 if (sctp_list_single_entry(&bp
->address_list
)) {
4547 addr
= list_entry(bp
->address_list
.next
,
4548 struct sctp_sockaddr_entry
, list
);
4549 if (sctp_is_any(&addr
->a
)) {
4550 cnt
= sctp_copy_laddrs_old(sk
, bp
->port
,
4552 addrs
, &bytes_copied
);
4558 /* Protection on the bound address list is not needed since
4559 * in the socket option context we hold a socket lock and
4560 * thus the bound address list can't change.
4562 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4563 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4564 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4565 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4566 memcpy(buf
, &temp
, addrlen
);
4568 bytes_copied
+= addrlen
;
4570 if (cnt
>= getaddrs
.addr_num
) break;
4574 /* copy the entire address list into the user provided space */
4575 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4580 /* copy the leading structure back to user */
4581 getaddrs
.addr_num
= cnt
;
4582 if (copy_to_user(optval
, &getaddrs
, len
))
4590 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4591 char __user
*optval
, int __user
*optlen
)
4593 struct sctp_bind_addr
*bp
;
4594 struct sctp_association
*asoc
;
4596 struct sctp_getaddrs getaddrs
;
4597 struct sctp_sockaddr_entry
*addr
;
4599 union sctp_addr temp
;
4600 struct sctp_sock
*sp
= sctp_sk(sk
);
4604 int bytes_copied
= 0;
4608 if (len
< sizeof(struct sctp_getaddrs
))
4611 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4615 * For UDP-style sockets, id specifies the association to query.
4616 * If the id field is set to the value '0' then the locally bound
4617 * addresses are returned without regard to any particular
4620 if (0 == getaddrs
.assoc_id
) {
4621 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4623 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4626 bp
= &asoc
->base
.bind_addr
;
4629 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4630 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4632 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4636 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4637 * addresses from the global local address list.
4639 if (sctp_list_single_entry(&bp
->address_list
)) {
4640 addr
= list_entry(bp
->address_list
.next
,
4641 struct sctp_sockaddr_entry
, list
);
4642 if (sctp_is_any(&addr
->a
)) {
4643 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4644 space_left
, &bytes_copied
);
4654 /* Protection on the bound address list is not needed since
4655 * in the socket option context we hold a socket lock and
4656 * thus the bound address list can't change.
4658 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4659 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4660 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4661 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4662 if (space_left
< addrlen
) {
4663 err
= -ENOMEM
; /*fixme: right error?*/
4666 memcpy(buf
, &temp
, addrlen
);
4668 bytes_copied
+= addrlen
;
4670 space_left
-= addrlen
;
4674 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4678 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4682 if (put_user(bytes_copied
, optlen
))
4689 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4691 * Requests that the local SCTP stack use the enclosed peer address as
4692 * the association primary. The enclosed address must be one of the
4693 * association peer's addresses.
4695 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4696 char __user
*optval
, int __user
*optlen
)
4698 struct sctp_prim prim
;
4699 struct sctp_association
*asoc
;
4700 struct sctp_sock
*sp
= sctp_sk(sk
);
4702 if (len
< sizeof(struct sctp_prim
))
4705 len
= sizeof(struct sctp_prim
);
4707 if (copy_from_user(&prim
, optval
, len
))
4710 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4714 if (!asoc
->peer
.primary_path
)
4717 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4718 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4720 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4721 (union sctp_addr
*)&prim
.ssp_addr
);
4723 if (put_user(len
, optlen
))
4725 if (copy_to_user(optval
, &prim
, len
))
4732 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4734 * Requests that the local endpoint set the specified Adaptation Layer
4735 * Indication parameter for all future INIT and INIT-ACK exchanges.
4737 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4738 char __user
*optval
, int __user
*optlen
)
4740 struct sctp_setadaptation adaptation
;
4742 if (len
< sizeof(struct sctp_setadaptation
))
4745 len
= sizeof(struct sctp_setadaptation
);
4747 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4749 if (put_user(len
, optlen
))
4751 if (copy_to_user(optval
, &adaptation
, len
))
4759 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4761 * Applications that wish to use the sendto() system call may wish to
4762 * specify a default set of parameters that would normally be supplied
4763 * through the inclusion of ancillary data. This socket option allows
4764 * such an application to set the default sctp_sndrcvinfo structure.
4767 * The application that wishes to use this socket option simply passes
4768 * in to this call the sctp_sndrcvinfo structure defined in Section
4769 * 5.2.2) The input parameters accepted by this call include
4770 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4771 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4772 * to this call if the caller is using the UDP model.
4774 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4776 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4777 int len
, char __user
*optval
,
4780 struct sctp_sndrcvinfo info
;
4781 struct sctp_association
*asoc
;
4782 struct sctp_sock
*sp
= sctp_sk(sk
);
4784 if (len
< sizeof(struct sctp_sndrcvinfo
))
4787 len
= sizeof(struct sctp_sndrcvinfo
);
4789 if (copy_from_user(&info
, optval
, len
))
4792 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4793 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4797 info
.sinfo_stream
= asoc
->default_stream
;
4798 info
.sinfo_flags
= asoc
->default_flags
;
4799 info
.sinfo_ppid
= asoc
->default_ppid
;
4800 info
.sinfo_context
= asoc
->default_context
;
4801 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4803 info
.sinfo_stream
= sp
->default_stream
;
4804 info
.sinfo_flags
= sp
->default_flags
;
4805 info
.sinfo_ppid
= sp
->default_ppid
;
4806 info
.sinfo_context
= sp
->default_context
;
4807 info
.sinfo_timetolive
= sp
->default_timetolive
;
4810 if (put_user(len
, optlen
))
4812 if (copy_to_user(optval
, &info
, len
))
4820 * 7.1.5 SCTP_NODELAY
4822 * Turn on/off any Nagle-like algorithm. This means that packets are
4823 * generally sent as soon as possible and no unnecessary delays are
4824 * introduced, at the cost of more packets in the network. Expects an
4825 * integer boolean flag.
4828 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4829 char __user
*optval
, int __user
*optlen
)
4833 if (len
< sizeof(int))
4837 val
= (sctp_sk(sk
)->nodelay
== 1);
4838 if (put_user(len
, optlen
))
4840 if (copy_to_user(optval
, &val
, len
))
4847 * 7.1.1 SCTP_RTOINFO
4849 * The protocol parameters used to initialize and bound retransmission
4850 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4851 * and modify these parameters.
4852 * All parameters are time values, in milliseconds. A value of 0, when
4853 * modifying the parameters, indicates that the current value should not
4857 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4858 char __user
*optval
,
4859 int __user
*optlen
) {
4860 struct sctp_rtoinfo rtoinfo
;
4861 struct sctp_association
*asoc
;
4863 if (len
< sizeof (struct sctp_rtoinfo
))
4866 len
= sizeof(struct sctp_rtoinfo
);
4868 if (copy_from_user(&rtoinfo
, optval
, len
))
4871 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4873 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4876 /* Values corresponding to the specific association. */
4878 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4879 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4880 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4882 /* Values corresponding to the endpoint. */
4883 struct sctp_sock
*sp
= sctp_sk(sk
);
4885 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4886 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4887 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4890 if (put_user(len
, optlen
))
4893 if (copy_to_user(optval
, &rtoinfo
, len
))
4901 * 7.1.2 SCTP_ASSOCINFO
4903 * This option is used to tune the maximum retransmission attempts
4904 * of the association.
4905 * Returns an error if the new association retransmission value is
4906 * greater than the sum of the retransmission value of the peer.
4907 * See [SCTP] for more information.
4910 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4911 char __user
*optval
,
4915 struct sctp_assocparams assocparams
;
4916 struct sctp_association
*asoc
;
4917 struct list_head
*pos
;
4920 if (len
< sizeof (struct sctp_assocparams
))
4923 len
= sizeof(struct sctp_assocparams
);
4925 if (copy_from_user(&assocparams
, optval
, len
))
4928 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4930 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4933 /* Values correspoinding to the specific association */
4935 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4936 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4937 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4938 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4940 (asoc
->cookie_life
.tv_usec
4943 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4947 assocparams
.sasoc_number_peer_destinations
= cnt
;
4949 /* Values corresponding to the endpoint */
4950 struct sctp_sock
*sp
= sctp_sk(sk
);
4952 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4953 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4954 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4955 assocparams
.sasoc_cookie_life
=
4956 sp
->assocparams
.sasoc_cookie_life
;
4957 assocparams
.sasoc_number_peer_destinations
=
4959 sasoc_number_peer_destinations
;
4962 if (put_user(len
, optlen
))
4965 if (copy_to_user(optval
, &assocparams
, len
))
4972 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4974 * This socket option is a boolean flag which turns on or off mapped V4
4975 * addresses. If this option is turned on and the socket is type
4976 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4977 * If this option is turned off, then no mapping will be done of V4
4978 * addresses and a user will receive both PF_INET6 and PF_INET type
4979 * addresses on the socket.
4981 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
4982 char __user
*optval
, int __user
*optlen
)
4985 struct sctp_sock
*sp
= sctp_sk(sk
);
4987 if (len
< sizeof(int))
4992 if (put_user(len
, optlen
))
4994 if (copy_to_user(optval
, &val
, len
))
5001 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5002 * (chapter and verse is quoted at sctp_setsockopt_context())
5004 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
5005 char __user
*optval
, int __user
*optlen
)
5007 struct sctp_assoc_value params
;
5008 struct sctp_sock
*sp
;
5009 struct sctp_association
*asoc
;
5011 if (len
< sizeof(struct sctp_assoc_value
))
5014 len
= sizeof(struct sctp_assoc_value
);
5016 if (copy_from_user(¶ms
, optval
, len
))
5021 if (params
.assoc_id
!= 0) {
5022 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5025 params
.assoc_value
= asoc
->default_rcv_context
;
5027 params
.assoc_value
= sp
->default_rcv_context
;
5030 if (put_user(len
, optlen
))
5032 if (copy_to_user(optval
, ¶ms
, len
))
5039 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
5041 * This socket option specifies the maximum size to put in any outgoing
5042 * SCTP chunk. If a message is larger than this size it will be
5043 * fragmented by SCTP into the specified size. Note that the underlying
5044 * SCTP implementation may fragment into smaller sized chunks when the
5045 * PMTU of the underlying association is smaller than the value set by
5048 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
5049 char __user
*optval
, int __user
*optlen
)
5053 if (len
< sizeof(int))
5058 val
= sctp_sk(sk
)->user_frag
;
5059 if (put_user(len
, optlen
))
5061 if (copy_to_user(optval
, &val
, len
))
5068 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5069 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5071 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
5072 char __user
*optval
, int __user
*optlen
)
5076 if (len
< sizeof(int))
5081 val
= sctp_sk(sk
)->frag_interleave
;
5082 if (put_user(len
, optlen
))
5084 if (copy_to_user(optval
, &val
, len
))
5091 * 7.1.25. Set or Get the sctp partial delivery point
5092 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5094 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
5095 char __user
*optval
,
5100 if (len
< sizeof(u32
))
5105 val
= sctp_sk(sk
)->pd_point
;
5106 if (put_user(len
, optlen
))
5108 if (copy_to_user(optval
, &val
, len
))
5115 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5116 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5118 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5119 char __user
*optval
,
5122 struct sctp_assoc_value params
;
5123 struct sctp_sock
*sp
;
5124 struct sctp_association
*asoc
;
5126 if (len
< sizeof(int))
5129 if (len
== sizeof(int)) {
5131 "SCTP: Use of int in max_burst socket option deprecated\n");
5133 "SCTP: Use struct sctp_assoc_value instead\n");
5134 params
.assoc_id
= 0;
5135 } else if (len
== sizeof (struct sctp_assoc_value
)) {
5136 if (copy_from_user(¶ms
, optval
, len
))
5143 if (params
.assoc_id
!= 0) {
5144 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5147 params
.assoc_value
= asoc
->max_burst
;
5149 params
.assoc_value
= sp
->max_burst
;
5151 if (len
== sizeof(int)) {
5152 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5155 if (copy_to_user(optval
, ¶ms
, len
))
5163 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5164 char __user
*optval
, int __user
*optlen
)
5166 struct sctp_hmac_algo_param
*hmacs
;
5169 hmacs
= sctp_sk(sk
)->ep
->auth_hmacs_list
;
5170 param_len
= ntohs(hmacs
->param_hdr
.length
);
5172 if (len
< param_len
)
5174 if (put_user(len
, optlen
))
5176 if (copy_to_user(optval
, hmacs
->hmac_ids
, len
))
5182 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5183 char __user
*optval
, int __user
*optlen
)
5185 struct sctp_authkeyid val
;
5186 struct sctp_association
*asoc
;
5188 if (len
< sizeof(struct sctp_authkeyid
))
5190 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5193 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5194 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5198 val
.scact_keynumber
= asoc
->active_key_id
;
5200 val
.scact_keynumber
= sctp_sk(sk
)->ep
->active_key_id
;
5205 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5206 char __user
*optval
, int __user
*optlen
)
5208 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5209 struct sctp_authchunks val
;
5210 struct sctp_association
*asoc
;
5211 struct sctp_chunks_param
*ch
;
5215 if (len
<= sizeof(struct sctp_authchunks
))
5218 if (copy_from_user(&val
, p
, sizeof(struct sctp_authchunks
)))
5221 to
= p
->gauth_chunks
;
5222 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5226 ch
= asoc
->peer
.peer_chunks
;
5228 /* See if the user provided enough room for all the data */
5229 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5230 if (len
< num_chunks
)
5234 if (put_user(len
, optlen
))
5236 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5238 if (copy_to_user(to
, ch
->chunks
, len
))
5244 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
5245 char __user
*optval
, int __user
*optlen
)
5247 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5248 struct sctp_authchunks val
;
5249 struct sctp_association
*asoc
;
5250 struct sctp_chunks_param
*ch
;
5254 if (len
<= sizeof(struct sctp_authchunks
))
5257 if (copy_from_user(&val
, p
, sizeof(struct sctp_authchunks
)))
5260 to
= p
->gauth_chunks
;
5261 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5262 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
5266 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
5268 ch
= sctp_sk(sk
)->ep
->auth_chunk_list
;
5270 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5271 if (len
< num_chunks
)
5275 if (put_user(len
, optlen
))
5277 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5279 if (copy_to_user(to
, ch
->chunks
, len
))
5285 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
5286 char __user
*optval
, int __user
*optlen
)
5291 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5294 /* I can hardly begin to describe how wrong this is. This is
5295 * so broken as to be worse than useless. The API draft
5296 * REALLY is NOT helpful here... I am not convinced that the
5297 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5298 * are at all well-founded.
5300 if (level
!= SOL_SCTP
) {
5301 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5303 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
5307 if (get_user(len
, optlen
))
5314 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
5316 case SCTP_DISABLE_FRAGMENTS
:
5317 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
5321 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
5323 case SCTP_AUTOCLOSE
:
5324 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
5326 case SCTP_SOCKOPT_PEELOFF
:
5327 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
5329 case SCTP_PEER_ADDR_PARAMS
:
5330 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
5333 case SCTP_DELAYED_ACK
:
5334 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
5338 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
5340 case SCTP_GET_PEER_ADDRS_NUM_OLD
:
5341 retval
= sctp_getsockopt_peer_addrs_num_old(sk
, len
, optval
,
5344 case SCTP_GET_LOCAL_ADDRS_NUM_OLD
:
5345 retval
= sctp_getsockopt_local_addrs_num_old(sk
, len
, optval
,
5348 case SCTP_GET_PEER_ADDRS_OLD
:
5349 retval
= sctp_getsockopt_peer_addrs_old(sk
, len
, optval
,
5352 case SCTP_GET_LOCAL_ADDRS_OLD
:
5353 retval
= sctp_getsockopt_local_addrs_old(sk
, len
, optval
,
5356 case SCTP_GET_PEER_ADDRS
:
5357 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
5360 case SCTP_GET_LOCAL_ADDRS
:
5361 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
5364 case SCTP_DEFAULT_SEND_PARAM
:
5365 retval
= sctp_getsockopt_default_send_param(sk
, len
,
5368 case SCTP_PRIMARY_ADDR
:
5369 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
5372 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
5375 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
5377 case SCTP_ASSOCINFO
:
5378 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
5380 case SCTP_I_WANT_MAPPED_V4_ADDR
:
5381 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
5384 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
5386 case SCTP_GET_PEER_ADDR_INFO
:
5387 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
5390 case SCTP_ADAPTATION_LAYER
:
5391 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
5395 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
5397 case SCTP_FRAGMENT_INTERLEAVE
:
5398 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
5401 case SCTP_PARTIAL_DELIVERY_POINT
:
5402 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
5405 case SCTP_MAX_BURST
:
5406 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
5409 case SCTP_AUTH_CHUNK
:
5410 case SCTP_AUTH_DELETE_KEY
:
5411 retval
= -EOPNOTSUPP
;
5413 case SCTP_HMAC_IDENT
:
5414 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
5416 case SCTP_AUTH_ACTIVE_KEY
:
5417 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
5419 case SCTP_PEER_AUTH_CHUNKS
:
5420 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
5423 case SCTP_LOCAL_AUTH_CHUNKS
:
5424 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
5428 retval
= -ENOPROTOOPT
;
5432 sctp_release_sock(sk
);
5436 static void sctp_hash(struct sock
*sk
)
5441 static void sctp_unhash(struct sock
*sk
)
5446 /* Check if port is acceptable. Possibly find first available port.
5448 * The port hash table (contained in the 'global' SCTP protocol storage
5449 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5450 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5451 * list (the list number is the port number hashed out, so as you
5452 * would expect from a hash function, all the ports in a given list have
5453 * such a number that hashes out to the same list number; you were
5454 * expecting that, right?); so each list has a set of ports, with a
5455 * link to the socket (struct sock) that uses it, the port number and
5456 * a fastreuse flag (FIXME: NPI ipg).
5458 static struct sctp_bind_bucket
*sctp_bucket_create(
5459 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
5461 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
5463 struct sctp_bind_hashbucket
*head
; /* hash list */
5464 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5465 struct hlist_node
*node
;
5466 unsigned short snum
;
5469 snum
= ntohs(addr
->v4
.sin_port
);
5471 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
5472 sctp_local_bh_disable();
5475 /* Search for an available port. */
5476 int low
, high
, remaining
, index
;
5479 inet_get_local_port_range(&low
, &high
);
5480 remaining
= (high
- low
) + 1;
5481 rover
= net_random() % remaining
+ low
;
5485 if ((rover
< low
) || (rover
> high
))
5487 index
= sctp_phashfn(rover
);
5488 head
= &sctp_port_hashtable
[index
];
5489 sctp_spin_lock(&head
->lock
);
5490 sctp_for_each_hentry(pp
, node
, &head
->chain
)
5491 if (pp
->port
== rover
)
5495 sctp_spin_unlock(&head
->lock
);
5496 } while (--remaining
> 0);
5498 /* Exhausted local port range during search? */
5503 /* OK, here is the one we will use. HEAD (the port
5504 * hash table list entry) is non-NULL and we hold it's
5509 /* We are given an specific port number; we verify
5510 * that it is not being used. If it is used, we will
5511 * exahust the search in the hash list corresponding
5512 * to the port number (snum) - we detect that with the
5513 * port iterator, pp being NULL.
5515 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
5516 sctp_spin_lock(&head
->lock
);
5517 sctp_for_each_hentry(pp
, node
, &head
->chain
) {
5518 if (pp
->port
== snum
)
5525 if (!hlist_empty(&pp
->owner
)) {
5526 /* We had a port hash table hit - there is an
5527 * available port (pp != NULL) and it is being
5528 * used by other socket (pp->owner not empty); that other
5529 * socket is going to be sk2.
5531 int reuse
= sk
->sk_reuse
;
5533 struct hlist_node
*node
;
5535 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5536 if (pp
->fastreuse
&& sk
->sk_reuse
&&
5537 sk
->sk_state
!= SCTP_SS_LISTENING
)
5540 /* Run through the list of sockets bound to the port
5541 * (pp->port) [via the pointers bind_next and
5542 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5543 * we get the endpoint they describe and run through
5544 * the endpoint's list of IP (v4 or v6) addresses,
5545 * comparing each of the addresses with the address of
5546 * the socket sk. If we find a match, then that means
5547 * that this port/socket (sk) combination are already
5550 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
5551 struct sctp_endpoint
*ep2
;
5552 ep2
= sctp_sk(sk2
)->ep
;
5554 if (reuse
&& sk2
->sk_reuse
&&
5555 sk2
->sk_state
!= SCTP_SS_LISTENING
)
5558 if (sctp_bind_addr_match(&ep2
->base
.bind_addr
, addr
,
5564 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5567 /* If there was a hash table miss, create a new port. */
5569 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
5572 /* In either case (hit or miss), make sure fastreuse is 1 only
5573 * if sk->sk_reuse is too (that is, if the caller requested
5574 * SO_REUSEADDR on this socket -sk-).
5576 if (hlist_empty(&pp
->owner
)) {
5577 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
5581 } else if (pp
->fastreuse
&&
5582 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
5585 /* We are set, so fill up all the data in the hash table
5586 * entry, tie the socket list information with the rest of the
5587 * sockets FIXME: Blurry, NPI (ipg).
5590 if (!sctp_sk(sk
)->bind_hash
) {
5591 inet_sk(sk
)->num
= snum
;
5592 sk_add_bind_node(sk
, &pp
->owner
);
5593 sctp_sk(sk
)->bind_hash
= pp
;
5598 sctp_spin_unlock(&head
->lock
);
5601 sctp_local_bh_enable();
5605 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5606 * port is requested.
5608 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
5611 union sctp_addr addr
;
5612 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5614 /* Set up a dummy address struct from the sk. */
5615 af
->from_sk(&addr
, sk
);
5616 addr
.v4
.sin_port
= htons(snum
);
5618 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5619 ret
= sctp_get_port_local(sk
, &addr
);
5621 return (ret
? 1 : 0);
5625 * 3.1.3 listen() - UDP Style Syntax
5627 * By default, new associations are not accepted for UDP style sockets.
5628 * An application uses listen() to mark a socket as being able to
5629 * accept new associations.
5631 SCTP_STATIC
int sctp_seqpacket_listen(struct sock
*sk
, int backlog
)
5633 struct sctp_sock
*sp
= sctp_sk(sk
);
5634 struct sctp_endpoint
*ep
= sp
->ep
;
5636 /* Only UDP style sockets that are not peeled off are allowed to
5639 if (!sctp_style(sk
, UDP
))
5642 /* If backlog is zero, disable listening. */
5644 if (sctp_sstate(sk
, CLOSED
))
5647 sctp_unhash_endpoint(ep
);
5648 sk
->sk_state
= SCTP_SS_CLOSED
;
5652 /* Return if we are already listening. */
5653 if (sctp_sstate(sk
, LISTENING
))
5657 * If a bind() or sctp_bindx() is not called prior to a listen()
5658 * call that allows new associations to be accepted, the system
5659 * picks an ephemeral port and will choose an address set equivalent
5660 * to binding with a wildcard address.
5662 * This is not currently spelled out in the SCTP sockets
5663 * extensions draft, but follows the practice as seen in TCP
5666 * Additionally, turn off fastreuse flag since we are not listening
5668 sk
->sk_state
= SCTP_SS_LISTENING
;
5669 if (!ep
->base
.bind_addr
.port
) {
5670 if (sctp_autobind(sk
))
5673 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5675 sctp_hash_endpoint(ep
);
5680 * 4.1.3 listen() - TCP Style Syntax
5682 * Applications uses listen() to ready the SCTP endpoint for accepting
5683 * inbound associations.
5685 SCTP_STATIC
int sctp_stream_listen(struct sock
*sk
, int backlog
)
5687 struct sctp_sock
*sp
= sctp_sk(sk
);
5688 struct sctp_endpoint
*ep
= sp
->ep
;
5690 /* If backlog is zero, disable listening. */
5692 if (sctp_sstate(sk
, CLOSED
))
5695 sctp_unhash_endpoint(ep
);
5696 sk
->sk_state
= SCTP_SS_CLOSED
;
5700 if (sctp_sstate(sk
, LISTENING
))
5704 * If a bind() or sctp_bindx() is not called prior to a listen()
5705 * call that allows new associations to be accepted, the system
5706 * picks an ephemeral port and will choose an address set equivalent
5707 * to binding with a wildcard address.
5709 * This is not currently spelled out in the SCTP sockets
5710 * extensions draft, but follows the practice as seen in TCP
5713 sk
->sk_state
= SCTP_SS_LISTENING
;
5714 if (!ep
->base
.bind_addr
.port
) {
5715 if (sctp_autobind(sk
))
5718 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5720 sk
->sk_max_ack_backlog
= backlog
;
5721 sctp_hash_endpoint(ep
);
5726 * Move a socket to LISTENING state.
5728 int sctp_inet_listen(struct socket
*sock
, int backlog
)
5730 struct sock
*sk
= sock
->sk
;
5731 struct crypto_hash
*tfm
= NULL
;
5734 if (unlikely(backlog
< 0))
5739 if (sock
->state
!= SS_UNCONNECTED
)
5742 /* Allocate HMAC for generating cookie. */
5743 if (sctp_hmac_alg
) {
5744 tfm
= crypto_alloc_hash(sctp_hmac_alg
, 0, CRYPTO_ALG_ASYNC
);
5746 if (net_ratelimit()) {
5748 "SCTP: failed to load transform for %s: %ld\n",
5749 sctp_hmac_alg
, PTR_ERR(tfm
));
5756 switch (sock
->type
) {
5757 case SOCK_SEQPACKET
:
5758 err
= sctp_seqpacket_listen(sk
, backlog
);
5761 err
= sctp_stream_listen(sk
, backlog
);
5770 /* Store away the transform reference. */
5771 sctp_sk(sk
)->hmac
= tfm
;
5773 sctp_release_sock(sk
);
5776 crypto_free_hash(tfm
);
5781 * This function is done by modeling the current datagram_poll() and the
5782 * tcp_poll(). Note that, based on these implementations, we don't
5783 * lock the socket in this function, even though it seems that,
5784 * ideally, locking or some other mechanisms can be used to ensure
5785 * the integrity of the counters (sndbuf and wmem_alloc) used
5786 * in this place. We assume that we don't need locks either until proven
5789 * Another thing to note is that we include the Async I/O support
5790 * here, again, by modeling the current TCP/UDP code. We don't have
5791 * a good way to test with it yet.
5793 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
5795 struct sock
*sk
= sock
->sk
;
5796 struct sctp_sock
*sp
= sctp_sk(sk
);
5799 poll_wait(file
, sk
->sk_sleep
, wait
);
5801 /* A TCP-style listening socket becomes readable when the accept queue
5804 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
5805 return (!list_empty(&sp
->ep
->asocs
)) ?
5806 (POLLIN
| POLLRDNORM
) : 0;
5810 /* Is there any exceptional events? */
5811 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
5813 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5815 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
5818 /* Is it readable? Reconsider this code with TCP-style support. */
5819 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
5820 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
5821 mask
|= POLLIN
| POLLRDNORM
;
5823 /* The association is either gone or not ready. */
5824 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
5827 /* Is it writable? */
5828 if (sctp_writeable(sk
)) {
5829 mask
|= POLLOUT
| POLLWRNORM
;
5831 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
5833 * Since the socket is not locked, the buffer
5834 * might be made available after the writeable check and
5835 * before the bit is set. This could cause a lost I/O
5836 * signal. tcp_poll() has a race breaker for this race
5837 * condition. Based on their implementation, we put
5838 * in the following code to cover it as well.
5840 if (sctp_writeable(sk
))
5841 mask
|= POLLOUT
| POLLWRNORM
;
5846 /********************************************************************
5847 * 2nd Level Abstractions
5848 ********************************************************************/
5850 static struct sctp_bind_bucket
*sctp_bucket_create(
5851 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
5853 struct sctp_bind_bucket
*pp
;
5855 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
5857 SCTP_DBG_OBJCNT_INC(bind_bucket
);
5860 INIT_HLIST_HEAD(&pp
->owner
);
5861 hlist_add_head(&pp
->node
, &head
->chain
);
5866 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5867 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
5869 if (pp
&& hlist_empty(&pp
->owner
)) {
5870 __hlist_del(&pp
->node
);
5871 kmem_cache_free(sctp_bucket_cachep
, pp
);
5872 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
5876 /* Release this socket's reference to a local port. */
5877 static inline void __sctp_put_port(struct sock
*sk
)
5879 struct sctp_bind_hashbucket
*head
=
5880 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->num
)];
5881 struct sctp_bind_bucket
*pp
;
5883 sctp_spin_lock(&head
->lock
);
5884 pp
= sctp_sk(sk
)->bind_hash
;
5885 __sk_del_bind_node(sk
);
5886 sctp_sk(sk
)->bind_hash
= NULL
;
5887 inet_sk(sk
)->num
= 0;
5888 sctp_bucket_destroy(pp
);
5889 sctp_spin_unlock(&head
->lock
);
5892 void sctp_put_port(struct sock
*sk
)
5894 sctp_local_bh_disable();
5895 __sctp_put_port(sk
);
5896 sctp_local_bh_enable();
5900 * The system picks an ephemeral port and choose an address set equivalent
5901 * to binding with a wildcard address.
5902 * One of those addresses will be the primary address for the association.
5903 * This automatically enables the multihoming capability of SCTP.
5905 static int sctp_autobind(struct sock
*sk
)
5907 union sctp_addr autoaddr
;
5911 /* Initialize a local sockaddr structure to INADDR_ANY. */
5912 af
= sctp_sk(sk
)->pf
->af
;
5914 port
= htons(inet_sk(sk
)->num
);
5915 af
->inaddr_any(&autoaddr
, port
);
5917 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5920 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5923 * 4.2 The cmsghdr Structure *
5925 * When ancillary data is sent or received, any number of ancillary data
5926 * objects can be specified by the msg_control and msg_controllen members of
5927 * the msghdr structure, because each object is preceded by
5928 * a cmsghdr structure defining the object's length (the cmsg_len member).
5929 * Historically Berkeley-derived implementations have passed only one object
5930 * at a time, but this API allows multiple objects to be
5931 * passed in a single call to sendmsg() or recvmsg(). The following example
5932 * shows two ancillary data objects in a control buffer.
5934 * |<--------------------------- msg_controllen -------------------------->|
5937 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5939 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5942 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5944 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5947 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5948 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5950 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5952 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5959 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
5960 sctp_cmsgs_t
*cmsgs
)
5962 struct cmsghdr
*cmsg
;
5963 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
5965 for (cmsg
= CMSG_FIRSTHDR(msg
);
5967 cmsg
= CMSG_NXTHDR(my_msg
, cmsg
)) {
5968 if (!CMSG_OK(my_msg
, cmsg
))
5971 /* Should we parse this header or ignore? */
5972 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
5975 /* Strictly check lengths following example in SCM code. */
5976 switch (cmsg
->cmsg_type
) {
5978 /* SCTP Socket API Extension
5979 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5981 * This cmsghdr structure provides information for
5982 * initializing new SCTP associations with sendmsg().
5983 * The SCTP_INITMSG socket option uses this same data
5984 * structure. This structure is not used for
5987 * cmsg_level cmsg_type cmsg_data[]
5988 * ------------ ------------ ----------------------
5989 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5991 if (cmsg
->cmsg_len
!=
5992 CMSG_LEN(sizeof(struct sctp_initmsg
)))
5994 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
5998 /* SCTP Socket API Extension
5999 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6001 * This cmsghdr structure specifies SCTP options for
6002 * sendmsg() and describes SCTP header information
6003 * about a received message through recvmsg().
6005 * cmsg_level cmsg_type cmsg_data[]
6006 * ------------ ------------ ----------------------
6007 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6009 if (cmsg
->cmsg_len
!=
6010 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
6014 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
6016 /* Minimally, validate the sinfo_flags. */
6017 if (cmsgs
->info
->sinfo_flags
&
6018 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
6019 SCTP_ABORT
| SCTP_EOF
))
6031 * Wait for a packet..
6032 * Note: This function is the same function as in core/datagram.c
6033 * with a few modifications to make lksctp work.
6035 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
6040 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
6042 /* Socket errors? */
6043 error
= sock_error(sk
);
6047 if (!skb_queue_empty(&sk
->sk_receive_queue
))
6050 /* Socket shut down? */
6051 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6054 /* Sequenced packets can come disconnected. If so we report the
6059 /* Is there a good reason to think that we may receive some data? */
6060 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
6063 /* Handle signals. */
6064 if (signal_pending(current
))
6067 /* Let another process have a go. Since we are going to sleep
6068 * anyway. Note: This may cause odd behaviors if the message
6069 * does not fit in the user's buffer, but this seems to be the
6070 * only way to honor MSG_DONTWAIT realistically.
6072 sctp_release_sock(sk
);
6073 *timeo_p
= schedule_timeout(*timeo_p
);
6077 finish_wait(sk
->sk_sleep
, &wait
);
6081 error
= sock_intr_errno(*timeo_p
);
6084 finish_wait(sk
->sk_sleep
, &wait
);
6089 /* Receive a datagram.
6090 * Note: This is pretty much the same routine as in core/datagram.c
6091 * with a few changes to make lksctp work.
6093 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
6094 int noblock
, int *err
)
6097 struct sk_buff
*skb
;
6100 timeo
= sock_rcvtimeo(sk
, noblock
);
6102 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6103 timeo
, MAX_SCHEDULE_TIMEOUT
);
6106 /* Again only user level code calls this function,
6107 * so nothing interrupt level
6108 * will suddenly eat the receive_queue.
6110 * Look at current nfs client by the way...
6111 * However, this function was corrent in any case. 8)
6113 if (flags
& MSG_PEEK
) {
6114 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
6115 skb
= skb_peek(&sk
->sk_receive_queue
);
6117 atomic_inc(&skb
->users
);
6118 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
6120 skb
= skb_dequeue(&sk
->sk_receive_queue
);
6126 /* Caller is allowed not to check sk->sk_err before calling. */
6127 error
= sock_error(sk
);
6131 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6134 /* User doesn't want to wait. */
6138 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
6147 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6148 static void __sctp_write_space(struct sctp_association
*asoc
)
6150 struct sock
*sk
= asoc
->base
.sk
;
6151 struct socket
*sock
= sk
->sk_socket
;
6153 if ((sctp_wspace(asoc
) > 0) && sock
) {
6154 if (waitqueue_active(&asoc
->wait
))
6155 wake_up_interruptible(&asoc
->wait
);
6157 if (sctp_writeable(sk
)) {
6158 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
6159 wake_up_interruptible(sk
->sk_sleep
);
6161 /* Note that we try to include the Async I/O support
6162 * here by modeling from the current TCP/UDP code.
6163 * We have not tested with it yet.
6165 if (sock
->fasync_list
&&
6166 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
6167 sock_wake_async(sock
,
6168 SOCK_WAKE_SPACE
, POLL_OUT
);
6173 /* Do accounting for the sndbuf space.
6174 * Decrement the used sndbuf space of the corresponding association by the
6175 * data size which was just transmitted(freed).
6177 static void sctp_wfree(struct sk_buff
*skb
)
6179 struct sctp_association
*asoc
;
6180 struct sctp_chunk
*chunk
;
6183 /* Get the saved chunk pointer. */
6184 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
6187 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
6188 sizeof(struct sk_buff
) +
6189 sizeof(struct sctp_chunk
);
6191 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
6194 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6196 sk
->sk_wmem_queued
-= skb
->truesize
;
6197 sk_mem_uncharge(sk
, skb
->truesize
);
6200 __sctp_write_space(asoc
);
6202 sctp_association_put(asoc
);
6205 /* Do accounting for the receive space on the socket.
6206 * Accounting for the association is done in ulpevent.c
6207 * We set this as a destructor for the cloned data skbs so that
6208 * accounting is done at the correct time.
6210 void sctp_sock_rfree(struct sk_buff
*skb
)
6212 struct sock
*sk
= skb
->sk
;
6213 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
6215 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
6218 * Mimic the behavior of sock_rfree
6220 sk_mem_uncharge(sk
, event
->rmem_len
);
6224 /* Helper function to wait for space in the sndbuf. */
6225 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
6228 struct sock
*sk
= asoc
->base
.sk
;
6230 long current_timeo
= *timeo_p
;
6233 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6234 asoc
, (long)(*timeo_p
), msg_len
);
6236 /* Increment the association's refcnt. */
6237 sctp_association_hold(asoc
);
6239 /* Wait on the association specific sndbuf space. */
6241 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6242 TASK_INTERRUPTIBLE
);
6245 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6248 if (signal_pending(current
))
6249 goto do_interrupted
;
6250 if (msg_len
<= sctp_wspace(asoc
))
6253 /* Let another process have a go. Since we are going
6256 sctp_release_sock(sk
);
6257 current_timeo
= schedule_timeout(current_timeo
);
6258 BUG_ON(sk
!= asoc
->base
.sk
);
6261 *timeo_p
= current_timeo
;
6265 finish_wait(&asoc
->wait
, &wait
);
6267 /* Release the association's refcnt. */
6268 sctp_association_put(asoc
);
6277 err
= sock_intr_errno(*timeo_p
);
6285 /* If socket sndbuf has changed, wake up all per association waiters. */
6286 void sctp_write_space(struct sock
*sk
)
6288 struct sctp_association
*asoc
;
6290 /* Wake up the tasks in each wait queue. */
6291 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
6292 __sctp_write_space(asoc
);
6296 /* Is there any sndbuf space available on the socket?
6298 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6299 * associations on the same socket. For a UDP-style socket with
6300 * multiple associations, it is possible for it to be "unwriteable"
6301 * prematurely. I assume that this is acceptable because
6302 * a premature "unwriteable" is better than an accidental "writeable" which
6303 * would cause an unwanted block under certain circumstances. For the 1-1
6304 * UDP-style sockets or TCP-style sockets, this code should work.
6307 static int sctp_writeable(struct sock
*sk
)
6311 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
6317 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6318 * returns immediately with EINPROGRESS.
6320 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
6322 struct sock
*sk
= asoc
->base
.sk
;
6324 long current_timeo
= *timeo_p
;
6327 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__
, asoc
,
6330 /* Increment the association's refcnt. */
6331 sctp_association_hold(asoc
);
6334 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6335 TASK_INTERRUPTIBLE
);
6338 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6340 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6343 if (signal_pending(current
))
6344 goto do_interrupted
;
6346 if (sctp_state(asoc
, ESTABLISHED
))
6349 /* Let another process have a go. Since we are going
6352 sctp_release_sock(sk
);
6353 current_timeo
= schedule_timeout(current_timeo
);
6356 *timeo_p
= current_timeo
;
6360 finish_wait(&asoc
->wait
, &wait
);
6362 /* Release the association's refcnt. */
6363 sctp_association_put(asoc
);
6368 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
6371 err
= -ECONNREFUSED
;
6375 err
= sock_intr_errno(*timeo_p
);
6383 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
6385 struct sctp_endpoint
*ep
;
6389 ep
= sctp_sk(sk
)->ep
;
6393 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
,
6394 TASK_INTERRUPTIBLE
);
6396 if (list_empty(&ep
->asocs
)) {
6397 sctp_release_sock(sk
);
6398 timeo
= schedule_timeout(timeo
);
6403 if (!sctp_sstate(sk
, LISTENING
))
6407 if (!list_empty(&ep
->asocs
))
6410 err
= sock_intr_errno(timeo
);
6411 if (signal_pending(current
))
6419 finish_wait(sk
->sk_sleep
, &wait
);
6424 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
6429 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
6430 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
6432 sctp_release_sock(sk
);
6433 timeout
= schedule_timeout(timeout
);
6435 } while (!signal_pending(current
) && timeout
);
6437 finish_wait(sk
->sk_sleep
, &wait
);
6440 static void sctp_sock_rfree_frag(struct sk_buff
*skb
)
6442 struct sk_buff
*frag
;
6447 /* Don't forget the fragments. */
6448 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
6449 sctp_sock_rfree_frag(frag
);
6452 sctp_sock_rfree(skb
);
6455 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
6457 struct sk_buff
*frag
;
6462 /* Don't forget the fragments. */
6463 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
6464 sctp_skb_set_owner_r_frag(frag
, sk
);
6467 sctp_skb_set_owner_r(skb
, sk
);
6470 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6471 * and its messages to the newsk.
6473 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
6474 struct sctp_association
*assoc
,
6475 sctp_socket_type_t type
)
6477 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
6478 struct sctp_sock
*newsp
= sctp_sk(newsk
);
6479 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
6480 struct sctp_endpoint
*newep
= newsp
->ep
;
6481 struct sk_buff
*skb
, *tmp
;
6482 struct sctp_ulpevent
*event
;
6483 struct sctp_bind_hashbucket
*head
;
6485 /* Migrate socket buffer sizes and all the socket level options to the
6488 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
6489 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
6490 /* Brute force copy old sctp opt. */
6491 inet_sk_copy_descendant(newsk
, oldsk
);
6493 /* Restore the ep value that was overwritten with the above structure
6499 /* Hook this new socket in to the bind_hash list. */
6500 head
= &sctp_port_hashtable
[sctp_phashfn(inet_sk(oldsk
)->num
)];
6501 sctp_local_bh_disable();
6502 sctp_spin_lock(&head
->lock
);
6503 pp
= sctp_sk(oldsk
)->bind_hash
;
6504 sk_add_bind_node(newsk
, &pp
->owner
);
6505 sctp_sk(newsk
)->bind_hash
= pp
;
6506 inet_sk(newsk
)->num
= inet_sk(oldsk
)->num
;
6507 sctp_spin_unlock(&head
->lock
);
6508 sctp_local_bh_enable();
6510 /* Copy the bind_addr list from the original endpoint to the new
6511 * endpoint so that we can handle restarts properly
6513 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
6514 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
6516 /* Move any messages in the old socket's receive queue that are for the
6517 * peeled off association to the new socket's receive queue.
6519 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
6520 event
= sctp_skb2event(skb
);
6521 if (event
->asoc
== assoc
) {
6522 sctp_sock_rfree_frag(skb
);
6523 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
6524 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
6525 sctp_skb_set_owner_r_frag(skb
, newsk
);
6529 /* Clean up any messages pending delivery due to partial
6530 * delivery. Three cases:
6531 * 1) No partial deliver; no work.
6532 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6533 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6535 skb_queue_head_init(&newsp
->pd_lobby
);
6536 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
6538 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
6539 struct sk_buff_head
*queue
;
6541 /* Decide which queue to move pd_lobby skbs to. */
6542 if (assoc
->ulpq
.pd_mode
) {
6543 queue
= &newsp
->pd_lobby
;
6545 queue
= &newsk
->sk_receive_queue
;
6547 /* Walk through the pd_lobby, looking for skbs that
6548 * need moved to the new socket.
6550 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6551 event
= sctp_skb2event(skb
);
6552 if (event
->asoc
== assoc
) {
6553 sctp_sock_rfree_frag(skb
);
6554 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6555 __skb_queue_tail(queue
, skb
);
6556 sctp_skb_set_owner_r_frag(skb
, newsk
);
6560 /* Clear up any skbs waiting for the partial
6561 * delivery to finish.
6563 if (assoc
->ulpq
.pd_mode
)
6564 sctp_clear_pd(oldsk
, NULL
);
6568 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
) {
6569 sctp_sock_rfree_frag(skb
);
6570 sctp_skb_set_owner_r_frag(skb
, newsk
);
6573 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
) {
6574 sctp_sock_rfree_frag(skb
);
6575 sctp_skb_set_owner_r_frag(skb
, newsk
);
6578 /* Set the type of socket to indicate that it is peeled off from the
6579 * original UDP-style socket or created with the accept() call on a
6580 * TCP-style socket..
6584 /* Mark the new socket "in-use" by the user so that any packets
6585 * that may arrive on the association after we've moved it are
6586 * queued to the backlog. This prevents a potential race between
6587 * backlog processing on the old socket and new-packet processing
6588 * on the new socket.
6590 * The caller has just allocated newsk so we can guarantee that other
6591 * paths won't try to lock it and then oldsk.
6593 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
6594 sctp_assoc_migrate(assoc
, newsk
);
6596 /* If the association on the newsk is already closed before accept()
6597 * is called, set RCV_SHUTDOWN flag.
6599 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
6600 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
6602 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
6603 sctp_release_sock(newsk
);
6607 /* This proto struct describes the ULP interface for SCTP. */
6608 struct proto sctp_prot
= {
6610 .owner
= THIS_MODULE
,
6611 .close
= sctp_close
,
6612 .connect
= sctp_connect
,
6613 .disconnect
= sctp_disconnect
,
6614 .accept
= sctp_accept
,
6615 .ioctl
= sctp_ioctl
,
6616 .init
= sctp_init_sock
,
6617 .destroy
= sctp_destroy_sock
,
6618 .shutdown
= sctp_shutdown
,
6619 .setsockopt
= sctp_setsockopt
,
6620 .getsockopt
= sctp_getsockopt
,
6621 .sendmsg
= sctp_sendmsg
,
6622 .recvmsg
= sctp_recvmsg
,
6624 .backlog_rcv
= sctp_backlog_rcv
,
6626 .unhash
= sctp_unhash
,
6627 .get_port
= sctp_get_port
,
6628 .obj_size
= sizeof(struct sctp_sock
),
6629 .sysctl_mem
= sysctl_sctp_mem
,
6630 .sysctl_rmem
= sysctl_sctp_rmem
,
6631 .sysctl_wmem
= sysctl_sctp_wmem
,
6632 .memory_pressure
= &sctp_memory_pressure
,
6633 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6634 .memory_allocated
= &sctp_memory_allocated
,
6635 .sockets_allocated
= &sctp_sockets_allocated
,
6638 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6640 struct proto sctpv6_prot
= {
6642 .owner
= THIS_MODULE
,
6643 .close
= sctp_close
,
6644 .connect
= sctp_connect
,
6645 .disconnect
= sctp_disconnect
,
6646 .accept
= sctp_accept
,
6647 .ioctl
= sctp_ioctl
,
6648 .init
= sctp_init_sock
,
6649 .destroy
= sctp_destroy_sock
,
6650 .shutdown
= sctp_shutdown
,
6651 .setsockopt
= sctp_setsockopt
,
6652 .getsockopt
= sctp_getsockopt
,
6653 .sendmsg
= sctp_sendmsg
,
6654 .recvmsg
= sctp_recvmsg
,
6656 .backlog_rcv
= sctp_backlog_rcv
,
6658 .unhash
= sctp_unhash
,
6659 .get_port
= sctp_get_port
,
6660 .obj_size
= sizeof(struct sctp6_sock
),
6661 .sysctl_mem
= sysctl_sctp_mem
,
6662 .sysctl_rmem
= sysctl_sctp_rmem
,
6663 .sysctl_wmem
= sysctl_sctp_wmem
,
6664 .memory_pressure
= &sctp_memory_pressure
,
6665 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6666 .memory_allocated
= &sctp_memory_allocated
,
6667 .sockets_allocated
= &sctp_sockets_allocated
,
6669 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */