1 /* SCTP kernel reference Implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel reference Implementation
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
18 * The SCTP reference implementation is free software;
19 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
24 * The SCTP reference implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, write to
32 * the Free Software Foundation, 59 Temple Place - Suite 330,
33 * Boston, MA 02111-1307, USA.
35 * Please send any bug reports or fixes you make to the
37 * lksctp developers <lksctp-developers@lists.sourceforge.net>
39 * Or submit a bug report through the following website:
40 * http://www.sf.net/projects/lksctp
42 * Written or modified by:
43 * La Monte H.P. Yarroll <piggy@acm.org>
44 * Narasimha Budihal <narsi@refcode.org>
45 * Karl Knutson <karl@athena.chicago.il.us>
46 * Jon Grimm <jgrimm@us.ibm.com>
47 * Xingang Guo <xingang.guo@intel.com>
48 * Daisy Chang <daisyc@us.ibm.com>
49 * Sridhar Samudrala <samudrala@us.ibm.com>
50 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
51 * Ardelle Fan <ardelle.fan@intel.com>
52 * Ryan Layer <rmlayer@us.ibm.com>
53 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
54 * Kevin Gao <kevin.gao@intel.com>
56 * Any bugs reported given to us we will try to fix... any fixes shared will
57 * be incorporated into the next SCTP release.
60 #include <linux/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_charge_skb(sk
, chunk
->skb
);
180 /* Verify that this is a valid address. */
181 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
186 /* Verify basic sockaddr. */
187 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
191 /* Is this a valid SCTP address? */
192 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
195 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
201 /* Look up the association by its id. If this is not a UDP-style
202 * socket, the ID field is always ignored.
204 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
206 struct sctp_association
*asoc
= NULL
;
208 /* If this is not a UDP-style socket, assoc id should be ignored. */
209 if (!sctp_style(sk
, UDP
)) {
210 /* Return NULL if the socket state is not ESTABLISHED. It
211 * could be a TCP-style listening socket or a socket which
212 * hasn't yet called connect() to establish an association.
214 if (!sctp_sstate(sk
, ESTABLISHED
))
217 /* Get the first and the only association from the list. */
218 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
219 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
220 struct sctp_association
, asocs
);
224 /* Otherwise this is a UDP-style socket. */
225 if (!id
|| (id
== (sctp_assoc_t
)-1))
228 spin_lock_bh(&sctp_assocs_id_lock
);
229 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
230 spin_unlock_bh(&sctp_assocs_id_lock
);
232 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
238 /* Look up the transport from an address and an assoc id. If both address and
239 * id are specified, the associations matching the address and the id should be
242 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
243 struct sockaddr_storage
*addr
,
246 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
247 struct sctp_transport
*transport
;
248 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
250 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
257 id_asoc
= sctp_id2assoc(sk
, id
);
258 if (id_asoc
&& (id_asoc
!= addr_asoc
))
261 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
262 (union sctp_addr
*)addr
);
267 /* API 3.1.2 bind() - UDP Style Syntax
268 * The syntax of bind() is,
270 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
272 * sd - the socket descriptor returned by socket().
273 * addr - the address structure (struct sockaddr_in or struct
274 * sockaddr_in6 [RFC 2553]),
275 * addr_len - the size of the address structure.
277 SCTP_STATIC
int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
283 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
286 /* Disallow binding twice. */
287 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
288 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
293 sctp_release_sock(sk
);
298 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
300 /* Verify this is a valid sockaddr. */
301 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
302 union sctp_addr
*addr
, int len
)
306 /* Check minimum size. */
307 if (len
< sizeof (struct sockaddr
))
310 /* Does this PF support this AF? */
311 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
314 /* If we get this far, af is valid. */
315 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
317 if (len
< af
->sockaddr_len
)
323 /* Bind a local address either to an endpoint or to an association. */
324 SCTP_STATIC
int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
326 struct sctp_sock
*sp
= sctp_sk(sk
);
327 struct sctp_endpoint
*ep
= sp
->ep
;
328 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
333 /* Common sockaddr verification. */
334 af
= sctp_sockaddr_af(sp
, addr
, len
);
336 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
341 snum
= ntohs(addr
->v4
.sin_port
);
343 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
344 ", port: %d, new port: %d, len: %d)\n",
350 /* PF specific bind() address verification. */
351 if (!sp
->pf
->bind_verify(sp
, addr
))
352 return -EADDRNOTAVAIL
;
354 /* We must either be unbound, or bind to the same port.
355 * It's OK to allow 0 ports if we are already bound.
356 * We'll just inhert an already bound port in this case
361 else if (snum
!= bp
->port
) {
362 SCTP_DEBUG_PRINTK("sctp_do_bind:"
363 " New port %d does not match existing port "
364 "%d.\n", snum
, bp
->port
);
369 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
372 /* Make sure we are allowed to bind here.
373 * The function sctp_get_port_local() does duplicate address
376 addr
->v4
.sin_port
= htons(snum
);
377 if ((ret
= sctp_get_port_local(sk
, addr
))) {
378 if (ret
== (long) sk
) {
379 /* This endpoint has a conflicting address. */
386 /* Refresh ephemeral port. */
388 bp
->port
= inet_sk(sk
)->num
;
390 /* Add the address to the bind address list.
391 * Use GFP_ATOMIC since BHs will be disabled.
393 ret
= sctp_add_bind_addr(bp
, addr
, 1, GFP_ATOMIC
);
395 /* Copy back into socket for getsockname() use. */
397 inet_sk(sk
)->sport
= htons(inet_sk(sk
)->num
);
398 af
->to_sk_saddr(addr
, sk
);
404 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
406 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
407 * at any one time. If a sender, after sending an ASCONF chunk, decides
408 * it needs to transfer another ASCONF Chunk, it MUST wait until the
409 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
410 * subsequent ASCONF. Note this restriction binds each side, so at any
411 * time two ASCONF may be in-transit on any given association (one sent
412 * from each endpoint).
414 static int sctp_send_asconf(struct sctp_association
*asoc
,
415 struct sctp_chunk
*chunk
)
419 /* If there is an outstanding ASCONF chunk, queue it for later
422 if (asoc
->addip_last_asconf
) {
423 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
427 /* Hold the chunk until an ASCONF_ACK is received. */
428 sctp_chunk_hold(chunk
);
429 retval
= sctp_primitive_ASCONF(asoc
, chunk
);
431 sctp_chunk_free(chunk
);
433 asoc
->addip_last_asconf
= chunk
;
439 /* Add a list of addresses as bind addresses to local endpoint or
442 * Basically run through each address specified in the addrs/addrcnt
443 * array/length pair, determine if it is IPv6 or IPv4 and call
444 * sctp_do_bind() on it.
446 * If any of them fails, then the operation will be reversed and the
447 * ones that were added will be removed.
449 * Only sctp_setsockopt_bindx() is supposed to call this function.
451 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
456 struct sockaddr
*sa_addr
;
459 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
463 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
464 /* The list may contain either IPv4 or IPv6 address;
465 * determine the address length for walking thru the list.
467 sa_addr
= (struct sockaddr
*)addr_buf
;
468 af
= sctp_get_af_specific(sa_addr
->sa_family
);
474 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
477 addr_buf
+= af
->sockaddr_len
;
481 /* Failed. Cleanup the ones that have been added */
483 sctp_bindx_rem(sk
, addrs
, cnt
);
491 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
492 * associations that are part of the endpoint indicating that a list of local
493 * addresses are added to the endpoint.
495 * If any of the addresses is already in the bind address list of the
496 * association, we do not send the chunk for that association. But it will not
497 * affect other associations.
499 * Only sctp_setsockopt_bindx() is supposed to call this function.
501 static int sctp_send_asconf_add_ip(struct sock
*sk
,
502 struct sockaddr
*addrs
,
505 struct sctp_sock
*sp
;
506 struct sctp_endpoint
*ep
;
507 struct sctp_association
*asoc
;
508 struct sctp_bind_addr
*bp
;
509 struct sctp_chunk
*chunk
;
510 struct sctp_sockaddr_entry
*laddr
;
511 union sctp_addr
*addr
;
512 union sctp_addr saveaddr
;
515 struct list_head
*pos
;
520 if (!sctp_addip_enable
)
526 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
527 __FUNCTION__
, sk
, addrs
, addrcnt
);
529 list_for_each(pos
, &ep
->asocs
) {
530 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
532 if (!asoc
->peer
.asconf_capable
)
535 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
538 if (!sctp_state(asoc
, ESTABLISHED
))
541 /* Check if any address in the packed array of addresses is
542 * in the bind address list of the association. If so,
543 * do not send the asconf chunk to its peer, but continue with
544 * other associations.
547 for (i
= 0; i
< addrcnt
; i
++) {
548 addr
= (union sctp_addr
*)addr_buf
;
549 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
555 if (sctp_assoc_lookup_laddr(asoc
, addr
))
558 addr_buf
+= af
->sockaddr_len
;
563 /* Use the first valid address in bind addr list of
564 * association as Address Parameter of ASCONF CHUNK.
566 bp
= &asoc
->base
.bind_addr
;
567 p
= bp
->address_list
.next
;
568 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
569 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
570 addrcnt
, SCTP_PARAM_ADD_IP
);
576 retval
= sctp_send_asconf(asoc
, chunk
);
580 /* Add the new addresses to the bind address list with
581 * use_as_src set to 0.
584 for (i
= 0; i
< addrcnt
; i
++) {
585 addr
= (union sctp_addr
*)addr_buf
;
586 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
587 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
588 retval
= sctp_add_bind_addr(bp
, &saveaddr
, 0,
590 addr_buf
+= af
->sockaddr_len
;
598 /* Remove a list of addresses from bind addresses list. Do not remove the
601 * Basically run through each address specified in the addrs/addrcnt
602 * array/length pair, determine if it is IPv6 or IPv4 and call
603 * sctp_del_bind() on it.
605 * If any of them fails, then the operation will be reversed and the
606 * ones that were removed will be added back.
608 * At least one address has to be left; if only one address is
609 * available, the operation will return -EBUSY.
611 * Only sctp_setsockopt_bindx() is supposed to call this function.
613 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
615 struct sctp_sock
*sp
= sctp_sk(sk
);
616 struct sctp_endpoint
*ep
= sp
->ep
;
618 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
621 union sctp_addr
*sa_addr
;
624 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
628 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
629 /* If the bind address list is empty or if there is only one
630 * bind address, there is nothing more to be removed (we need
631 * at least one address here).
633 if (list_empty(&bp
->address_list
) ||
634 (sctp_list_single_entry(&bp
->address_list
))) {
639 sa_addr
= (union sctp_addr
*)addr_buf
;
640 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
646 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
647 retval
= -EADDRNOTAVAIL
;
651 if (sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
656 /* FIXME - There is probably a need to check if sk->sk_saddr and
657 * sk->sk_rcv_addr are currently set to one of the addresses to
658 * be removed. This is something which needs to be looked into
659 * when we are fixing the outstanding issues with multi-homing
660 * socket routing and failover schemes. Refer to comments in
661 * sctp_do_bind(). -daisy
663 retval
= sctp_del_bind_addr(bp
, sa_addr
);
665 addr_buf
+= af
->sockaddr_len
;
668 /* Failed. Add the ones that has been removed back */
670 sctp_bindx_add(sk
, addrs
, cnt
);
678 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
679 * the associations that are part of the endpoint indicating that a list of
680 * local addresses are removed from the endpoint.
682 * If any of the addresses is already in the bind address list of the
683 * association, we do not send the chunk for that association. But it will not
684 * affect other associations.
686 * Only sctp_setsockopt_bindx() is supposed to call this function.
688 static int sctp_send_asconf_del_ip(struct sock
*sk
,
689 struct sockaddr
*addrs
,
692 struct sctp_sock
*sp
;
693 struct sctp_endpoint
*ep
;
694 struct sctp_association
*asoc
;
695 struct sctp_transport
*transport
;
696 struct sctp_bind_addr
*bp
;
697 struct sctp_chunk
*chunk
;
698 union sctp_addr
*laddr
;
701 struct list_head
*pos
, *pos1
;
702 struct sctp_sockaddr_entry
*saddr
;
706 if (!sctp_addip_enable
)
712 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
713 __FUNCTION__
, sk
, addrs
, addrcnt
);
715 list_for_each(pos
, &ep
->asocs
) {
716 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
718 if (!asoc
->peer
.asconf_capable
)
721 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
724 if (!sctp_state(asoc
, ESTABLISHED
))
727 /* Check if any address in the packed array of addresses is
728 * not present in the bind address list of the association.
729 * If so, do not send the asconf chunk to its peer, but
730 * continue with other associations.
733 for (i
= 0; i
< addrcnt
; i
++) {
734 laddr
= (union sctp_addr
*)addr_buf
;
735 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
741 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
744 addr_buf
+= af
->sockaddr_len
;
749 /* Find one address in the association's bind address list
750 * that is not in the packed array of addresses. This is to
751 * make sure that we do not delete all the addresses in the
754 bp
= &asoc
->base
.bind_addr
;
755 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
760 /* We do not need RCU protection throughout this loop
761 * because this is done under a socket lock from the
764 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
771 /* Reset use_as_src flag for the addresses in the bind address
772 * list that are to be deleted.
775 for (i
= 0; i
< addrcnt
; i
++) {
776 laddr
= (union sctp_addr
*)addr_buf
;
777 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
778 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
779 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
780 saddr
->use_as_src
= 0;
782 addr_buf
+= af
->sockaddr_len
;
785 /* Update the route and saddr entries for all the transports
786 * as some of the addresses in the bind address list are
787 * about to be deleted and cannot be used as source addresses.
789 list_for_each(pos1
, &asoc
->peer
.transport_addr_list
) {
790 transport
= list_entry(pos1
, struct sctp_transport
,
792 dst_release(transport
->dst
);
793 sctp_transport_route(transport
, NULL
,
794 sctp_sk(asoc
->base
.sk
));
797 retval
= sctp_send_asconf(asoc
, chunk
);
803 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
806 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
809 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
810 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
813 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
814 * Section 3.1.2 for this usage.
816 * addrs is a pointer to an array of one or more socket addresses. Each
817 * address is contained in its appropriate structure (i.e. struct
818 * sockaddr_in or struct sockaddr_in6) the family of the address type
819 * must be used to distinguish the address length (note that this
820 * representation is termed a "packed array" of addresses). The caller
821 * specifies the number of addresses in the array with addrcnt.
823 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
824 * -1, and sets errno to the appropriate error code.
826 * For SCTP, the port given in each socket address must be the same, or
827 * sctp_bindx() will fail, setting errno to EINVAL.
829 * The flags parameter is formed from the bitwise OR of zero or more of
830 * the following currently defined flags:
832 * SCTP_BINDX_ADD_ADDR
834 * SCTP_BINDX_REM_ADDR
836 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
837 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
838 * addresses from the association. The two flags are mutually exclusive;
839 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
840 * not remove all addresses from an association; sctp_bindx() will
841 * reject such an attempt with EINVAL.
843 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
844 * additional addresses with an endpoint after calling bind(). Or use
845 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
846 * socket is associated with so that no new association accepted will be
847 * associated with those addresses. If the endpoint supports dynamic
848 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
849 * endpoint to send the appropriate message to the peer to change the
850 * peers address lists.
852 * Adding and removing addresses from a connected association is
853 * optional functionality. Implementations that do not support this
854 * functionality should return EOPNOTSUPP.
856 * Basically do nothing but copying the addresses from user to kernel
857 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
858 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
861 * We don't use copy_from_user() for optimization: we first do the
862 * sanity checks (buffer size -fast- and access check-healthy
863 * pointer); if all of those succeed, then we can alloc the memory
864 * (expensive operation) needed to copy the data to kernel. Then we do
865 * the copying without checking the user space area
866 * (__copy_from_user()).
868 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
871 * sk The sk of the socket
872 * addrs The pointer to the addresses in user land
873 * addrssize Size of the addrs buffer
874 * op Operation to perform (add or remove, see the flags of
877 * Returns 0 if ok, <0 errno code on error.
879 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
880 struct sockaddr __user
*addrs
,
881 int addrs_size
, int op
)
883 struct sockaddr
*kaddrs
;
887 struct sockaddr
*sa_addr
;
891 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
892 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
894 if (unlikely(addrs_size
<= 0))
897 /* Check the user passed a healthy pointer. */
898 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
901 /* Alloc space for the address array in kernel memory. */
902 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
903 if (unlikely(!kaddrs
))
906 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
911 /* Walk through the addrs buffer and count the number of addresses. */
913 while (walk_size
< addrs_size
) {
914 sa_addr
= (struct sockaddr
*)addr_buf
;
915 af
= sctp_get_af_specific(sa_addr
->sa_family
);
917 /* If the address family is not supported or if this address
918 * causes the address buffer to overflow return EINVAL.
920 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
925 addr_buf
+= af
->sockaddr_len
;
926 walk_size
+= af
->sockaddr_len
;
931 case SCTP_BINDX_ADD_ADDR
:
932 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
935 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
938 case SCTP_BINDX_REM_ADDR
:
939 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
942 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
956 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
958 * Common routine for handling connect() and sctp_connectx().
959 * Connect will come in with just a single address.
961 static int __sctp_connect(struct sock
* sk
,
962 struct sockaddr
*kaddrs
,
965 struct sctp_sock
*sp
;
966 struct sctp_endpoint
*ep
;
967 struct sctp_association
*asoc
= NULL
;
968 struct sctp_association
*asoc2
;
969 struct sctp_transport
*transport
;
977 union sctp_addr
*sa_addr
= NULL
;
980 unsigned int f_flags
= 0;
985 /* connect() cannot be done on a socket that is already in ESTABLISHED
986 * state - UDP-style peeled off socket or a TCP-style socket that
987 * is already connected.
988 * It cannot be done even on a TCP-style listening socket.
990 if (sctp_sstate(sk
, ESTABLISHED
) ||
991 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
996 /* Walk through the addrs buffer and count the number of addresses. */
998 while (walk_size
< addrs_size
) {
999 sa_addr
= (union sctp_addr
*)addr_buf
;
1000 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1001 port
= ntohs(sa_addr
->v4
.sin_port
);
1003 /* If the address family is not supported or if this address
1004 * causes the address buffer to overflow return EINVAL.
1006 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1011 /* Save current address so we can work with it */
1012 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1014 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1018 /* Make sure the destination port is correctly set
1021 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
)
1025 /* Check if there already is a matching association on the
1026 * endpoint (other than the one created here).
1028 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1029 if (asoc2
&& asoc2
!= asoc
) {
1030 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1037 /* If we could not find a matching association on the endpoint,
1038 * make sure that there is no peeled-off association matching
1039 * the peer address even on another socket.
1041 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1042 err
= -EADDRNOTAVAIL
;
1047 /* If a bind() or sctp_bindx() is not called prior to
1048 * an sctp_connectx() call, the system picks an
1049 * ephemeral port and will choose an address set
1050 * equivalent to binding with a wildcard address.
1052 if (!ep
->base
.bind_addr
.port
) {
1053 if (sctp_autobind(sk
)) {
1059 * If an unprivileged user inherits a 1-many
1060 * style socket with open associations on a
1061 * privileged port, it MAY be permitted to
1062 * accept new associations, but it SHOULD NOT
1063 * be permitted to open new associations.
1065 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1066 !capable(CAP_NET_BIND_SERVICE
)) {
1072 scope
= sctp_scope(&to
);
1073 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1080 /* Prime the peer's transport structures. */
1081 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1089 addr_buf
+= af
->sockaddr_len
;
1090 walk_size
+= af
->sockaddr_len
;
1093 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1098 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1103 /* Initialize sk's dport and daddr for getpeername() */
1104 inet_sk(sk
)->dport
= htons(asoc
->peer
.port
);
1105 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1106 af
->to_sk_daddr(sa_addr
, sk
);
1109 /* in-kernel sockets don't generally have a file allocated to them
1110 * if all they do is call sock_create_kern().
1112 if (sk
->sk_socket
->file
)
1113 f_flags
= sk
->sk_socket
->file
->f_flags
;
1115 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1117 err
= sctp_wait_for_connect(asoc
, &timeo
);
1119 /* Don't free association on exit. */
1124 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1125 " kaddrs: %p err: %d\n",
1128 sctp_association_free(asoc
);
1132 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1135 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
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. On failure, sctp_connectx() returns
1152 * -1, and sets errno to the appropriate error code.
1154 * For SCTP, the port given in each socket address must be the same, or
1155 * sctp_connectx() will fail, setting errno to EINVAL.
1157 * An application can use sctp_connectx to initiate an association with
1158 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1159 * allows a caller to specify multiple addresses at which a peer can be
1160 * reached. The way the SCTP stack uses the list of addresses to set up
1161 * the association is implementation dependant. This function only
1162 * specifies that the stack will try to make use of all the addresses in
1163 * the list when needed.
1165 * Note that the list of addresses passed in is only used for setting up
1166 * the association. It does not necessarily equal the set of addresses
1167 * the peer uses for the resulting association. If the caller wants to
1168 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1169 * retrieve them after the association has been set up.
1171 * Basically do nothing but copying the addresses from user to kernel
1172 * land and invoking either sctp_connectx(). This is used for tunneling
1173 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1175 * We don't use copy_from_user() for optimization: we first do the
1176 * sanity checks (buffer size -fast- and access check-healthy
1177 * pointer); if all of those succeed, then we can alloc the memory
1178 * (expensive operation) needed to copy the data to kernel. Then we do
1179 * the copying without checking the user space area
1180 * (__copy_from_user()).
1182 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1185 * sk The sk of the socket
1186 * addrs The pointer to the addresses in user land
1187 * addrssize Size of the addrs buffer
1189 * Returns 0 if ok, <0 errno code on error.
1191 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1192 struct sockaddr __user
*addrs
,
1196 struct sockaddr
*kaddrs
;
1198 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1199 __FUNCTION__
, sk
, addrs
, addrs_size
);
1201 if (unlikely(addrs_size
<= 0))
1204 /* Check the user passed a healthy pointer. */
1205 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1208 /* Alloc space for the address array in kernel memory. */
1209 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1210 if (unlikely(!kaddrs
))
1213 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1216 err
= __sctp_connect(sk
, kaddrs
, addrs_size
);
1223 /* API 3.1.4 close() - UDP Style Syntax
1224 * Applications use close() to perform graceful shutdown (as described in
1225 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1226 * by a UDP-style socket.
1230 * ret = close(int sd);
1232 * sd - the socket descriptor of the associations to be closed.
1234 * To gracefully shutdown a specific association represented by the
1235 * UDP-style socket, an application should use the sendmsg() call,
1236 * passing no user data, but including the appropriate flag in the
1237 * ancillary data (see Section xxxx).
1239 * If sd in the close() call is a branched-off socket representing only
1240 * one association, the shutdown is performed on that association only.
1242 * 4.1.6 close() - TCP Style Syntax
1244 * Applications use close() to gracefully close down an association.
1248 * int close(int sd);
1250 * sd - the socket descriptor of the association to be closed.
1252 * After an application calls close() on a socket descriptor, no further
1253 * socket operations will succeed on that descriptor.
1255 * API 7.1.4 SO_LINGER
1257 * An application using the TCP-style socket can use this option to
1258 * perform the SCTP ABORT primitive. The linger option structure is:
1261 * int l_onoff; // option on/off
1262 * int l_linger; // linger time
1265 * To enable the option, set l_onoff to 1. If the l_linger value is set
1266 * to 0, calling close() is the same as the ABORT primitive. If the
1267 * value is set to a negative value, the setsockopt() call will return
1268 * an error. If the value is set to a positive value linger_time, the
1269 * close() can be blocked for at most linger_time ms. If the graceful
1270 * shutdown phase does not finish during this period, close() will
1271 * return but the graceful shutdown phase continues in the system.
1273 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1275 struct sctp_endpoint
*ep
;
1276 struct sctp_association
*asoc
;
1277 struct list_head
*pos
, *temp
;
1279 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1282 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1284 ep
= sctp_sk(sk
)->ep
;
1286 /* Walk all associations on an endpoint. */
1287 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1288 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1290 if (sctp_style(sk
, TCP
)) {
1291 /* A closed association can still be in the list if
1292 * it belongs to a TCP-style listening socket that is
1293 * not yet accepted. If so, free it. If not, send an
1294 * ABORT or SHUTDOWN based on the linger options.
1296 if (sctp_state(asoc
, CLOSED
)) {
1297 sctp_unhash_established(asoc
);
1298 sctp_association_free(asoc
);
1303 if (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
) {
1304 struct sctp_chunk
*chunk
;
1306 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1308 sctp_primitive_ABORT(asoc
, chunk
);
1310 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1313 /* Clean up any skbs sitting on the receive queue. */
1314 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1315 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1317 /* On a TCP-style socket, block for at most linger_time if set. */
1318 if (sctp_style(sk
, TCP
) && timeout
)
1319 sctp_wait_for_close(sk
, timeout
);
1321 /* This will run the backlog queue. */
1322 sctp_release_sock(sk
);
1324 /* Supposedly, no process has access to the socket, but
1325 * the net layers still may.
1327 sctp_local_bh_disable();
1328 sctp_bh_lock_sock(sk
);
1330 /* Hold the sock, since sk_common_release() will put sock_put()
1331 * and we have just a little more cleanup.
1334 sk_common_release(sk
);
1336 sctp_bh_unlock_sock(sk
);
1337 sctp_local_bh_enable();
1341 SCTP_DBG_OBJCNT_DEC(sock
);
1344 /* Handle EPIPE error. */
1345 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1348 err
= sock_error(sk
) ? : -EPIPE
;
1349 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1350 send_sig(SIGPIPE
, current
, 0);
1354 /* API 3.1.3 sendmsg() - UDP Style Syntax
1356 * An application uses sendmsg() and recvmsg() calls to transmit data to
1357 * and receive data from its peer.
1359 * ssize_t sendmsg(int socket, const struct msghdr *message,
1362 * socket - the socket descriptor of the endpoint.
1363 * message - pointer to the msghdr structure which contains a single
1364 * user message and possibly some ancillary data.
1366 * See Section 5 for complete description of the data
1369 * flags - flags sent or received with the user message, see Section
1370 * 5 for complete description of the flags.
1372 * Note: This function could use a rewrite especially when explicit
1373 * connect support comes in.
1375 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1377 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1379 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1380 struct msghdr
*msg
, size_t msg_len
)
1382 struct sctp_sock
*sp
;
1383 struct sctp_endpoint
*ep
;
1384 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1385 struct sctp_transport
*transport
, *chunk_tp
;
1386 struct sctp_chunk
*chunk
;
1388 struct sockaddr
*msg_name
= NULL
;
1389 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1390 struct sctp_sndrcvinfo
*sinfo
;
1391 struct sctp_initmsg
*sinit
;
1392 sctp_assoc_t associd
= 0;
1393 sctp_cmsgs_t cmsgs
= { NULL
};
1397 __u16 sinfo_flags
= 0;
1398 struct sctp_datamsg
*datamsg
;
1399 struct list_head
*pos
;
1400 int msg_flags
= msg
->msg_flags
;
1402 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1409 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1411 /* We cannot send a message over a TCP-style listening socket. */
1412 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1417 /* Parse out the SCTP CMSGs. */
1418 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1421 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1425 /* Fetch the destination address for this packet. This
1426 * address only selects the association--it is not necessarily
1427 * the address we will send to.
1428 * For a peeled-off socket, msg_name is ignored.
1430 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1431 int msg_namelen
= msg
->msg_namelen
;
1433 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1438 if (msg_namelen
> sizeof(to
))
1439 msg_namelen
= sizeof(to
);
1440 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1441 msg_name
= msg
->msg_name
;
1447 /* Did the user specify SNDRCVINFO? */
1449 sinfo_flags
= sinfo
->sinfo_flags
;
1450 associd
= sinfo
->sinfo_assoc_id
;
1453 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1454 msg_len
, sinfo_flags
);
1456 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1457 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1462 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1463 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1464 * If SCTP_ABORT is set, the message length could be non zero with
1465 * the msg_iov set to the user abort reason.
1467 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1468 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1473 /* If SCTP_ADDR_OVER is set, there must be an address
1474 * specified in msg_name.
1476 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1483 SCTP_DEBUG_PRINTK("About to look up association.\n");
1487 /* If a msg_name has been specified, assume this is to be used. */
1489 /* Look for a matching association on the endpoint. */
1490 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1492 /* If we could not find a matching association on the
1493 * endpoint, make sure that it is not a TCP-style
1494 * socket that already has an association or there is
1495 * no peeled-off association on another socket.
1497 if ((sctp_style(sk
, TCP
) &&
1498 sctp_sstate(sk
, ESTABLISHED
)) ||
1499 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1500 err
= -EADDRNOTAVAIL
;
1505 asoc
= sctp_id2assoc(sk
, associd
);
1513 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1515 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1516 * socket that has an association in CLOSED state. This can
1517 * happen when an accepted socket has an association that is
1520 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1525 if (sinfo_flags
& SCTP_EOF
) {
1526 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1528 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1532 if (sinfo_flags
& SCTP_ABORT
) {
1534 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1540 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1541 sctp_primitive_ABORT(asoc
, chunk
);
1547 /* Do we need to create the association? */
1549 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1551 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1556 /* Check for invalid stream against the stream counts,
1557 * either the default or the user specified stream counts.
1560 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1561 /* Check against the defaults. */
1562 if (sinfo
->sinfo_stream
>=
1563 sp
->initmsg
.sinit_num_ostreams
) {
1568 /* Check against the requested. */
1569 if (sinfo
->sinfo_stream
>=
1570 sinit
->sinit_num_ostreams
) {
1578 * API 3.1.2 bind() - UDP Style Syntax
1579 * If a bind() or sctp_bindx() is not called prior to a
1580 * sendmsg() call that initiates a new association, the
1581 * system picks an ephemeral port and will choose an address
1582 * set equivalent to binding with a wildcard address.
1584 if (!ep
->base
.bind_addr
.port
) {
1585 if (sctp_autobind(sk
)) {
1591 * If an unprivileged user inherits a one-to-many
1592 * style socket with open associations on a privileged
1593 * port, it MAY be permitted to accept new associations,
1594 * but it SHOULD NOT be permitted to open new
1597 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1598 !capable(CAP_NET_BIND_SERVICE
)) {
1604 scope
= sctp_scope(&to
);
1605 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1612 /* If the SCTP_INIT ancillary data is specified, set all
1613 * the association init values accordingly.
1616 if (sinit
->sinit_num_ostreams
) {
1617 asoc
->c
.sinit_num_ostreams
=
1618 sinit
->sinit_num_ostreams
;
1620 if (sinit
->sinit_max_instreams
) {
1621 asoc
->c
.sinit_max_instreams
=
1622 sinit
->sinit_max_instreams
;
1624 if (sinit
->sinit_max_attempts
) {
1625 asoc
->max_init_attempts
1626 = sinit
->sinit_max_attempts
;
1628 if (sinit
->sinit_max_init_timeo
) {
1629 asoc
->max_init_timeo
=
1630 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1634 /* Prime the peer's transport structures. */
1635 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1640 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, GFP_KERNEL
);
1647 /* ASSERT: we have a valid association at this point. */
1648 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1651 /* If the user didn't specify SNDRCVINFO, make up one with
1654 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1655 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1656 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1657 default_sinfo
.sinfo_context
= asoc
->default_context
;
1658 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1659 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1660 sinfo
= &default_sinfo
;
1663 /* API 7.1.7, the sndbuf size per association bounds the
1664 * maximum size of data that can be sent in a single send call.
1666 if (msg_len
> sk
->sk_sndbuf
) {
1671 if (asoc
->pmtu_pending
)
1672 sctp_assoc_pending_pmtu(asoc
);
1674 /* If fragmentation is disabled and the message length exceeds the
1675 * association fragmentation point, return EMSGSIZE. The I-D
1676 * does not specify what this error is, but this looks like
1679 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1685 /* Check for invalid stream. */
1686 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1692 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1693 if (!sctp_wspace(asoc
)) {
1694 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1699 /* If an address is passed with the sendto/sendmsg call, it is used
1700 * to override the primary destination address in the TCP model, or
1701 * when SCTP_ADDR_OVER flag is set in the UDP model.
1703 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1704 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1705 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1713 /* Auto-connect, if we aren't connected already. */
1714 if (sctp_state(asoc
, CLOSED
)) {
1715 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1718 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1721 /* Break the message into multiple chunks of maximum size. */
1722 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1728 /* Now send the (possibly) fragmented message. */
1729 list_for_each(pos
, &datamsg
->chunks
) {
1730 chunk
= list_entry(pos
, struct sctp_chunk
, frag_list
);
1731 sctp_datamsg_track(chunk
);
1733 /* Do accounting for the write space. */
1734 sctp_set_owner_w(chunk
);
1736 chunk
->transport
= chunk_tp
;
1738 /* Send it to the lower layers. Note: all chunks
1739 * must either fail or succeed. The lower layer
1740 * works that way today. Keep it that way or this
1743 err
= sctp_primitive_SEND(asoc
, chunk
);
1744 /* Did the lower layer accept the chunk? */
1746 sctp_chunk_free(chunk
);
1747 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1750 sctp_datamsg_free(datamsg
);
1756 /* If we are already past ASSOCIATE, the lower
1757 * layers are responsible for association cleanup.
1763 sctp_association_free(asoc
);
1765 sctp_release_sock(sk
);
1768 return sctp_error(sk
, msg_flags
, err
);
1775 err
= sock_error(sk
);
1785 /* This is an extended version of skb_pull() that removes the data from the
1786 * start of a skb even when data is spread across the list of skb's in the
1787 * frag_list. len specifies the total amount of data that needs to be removed.
1788 * when 'len' bytes could be removed from the skb, it returns 0.
1789 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1790 * could not be removed.
1792 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1794 struct sk_buff
*list
;
1795 int skb_len
= skb_headlen(skb
);
1798 if (len
<= skb_len
) {
1799 __skb_pull(skb
, len
);
1803 __skb_pull(skb
, skb_len
);
1805 for (list
= skb_shinfo(skb
)->frag_list
; list
; list
= list
->next
) {
1806 rlen
= sctp_skb_pull(list
, len
);
1807 skb
->len
-= (len
-rlen
);
1808 skb
->data_len
-= (len
-rlen
);
1819 /* API 3.1.3 recvmsg() - UDP Style Syntax
1821 * ssize_t recvmsg(int socket, struct msghdr *message,
1824 * socket - the socket descriptor of the endpoint.
1825 * message - pointer to the msghdr structure which contains a single
1826 * user message and possibly some ancillary data.
1828 * See Section 5 for complete description of the data
1831 * flags - flags sent or received with the user message, see Section
1832 * 5 for complete description of the flags.
1834 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1836 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1837 struct msghdr
*msg
, size_t len
, int noblock
,
1838 int flags
, int *addr_len
)
1840 struct sctp_ulpevent
*event
= NULL
;
1841 struct sctp_sock
*sp
= sctp_sk(sk
);
1842 struct sk_buff
*skb
;
1847 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1848 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1849 "len", len
, "knoblauch", noblock
,
1850 "flags", flags
, "addr_len", addr_len
);
1854 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1859 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1863 /* Get the total length of the skb including any skb's in the
1872 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1874 event
= sctp_skb2event(skb
);
1879 sock_recv_timestamp(msg
, sk
, skb
);
1880 if (sctp_ulpevent_is_notification(event
)) {
1881 msg
->msg_flags
|= MSG_NOTIFICATION
;
1882 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1884 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1887 /* Check if we allow SCTP_SNDRCVINFO. */
1888 if (sp
->subscribe
.sctp_data_io_event
)
1889 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1891 /* FIXME: we should be calling IP/IPv6 layers. */
1892 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1893 ip_cmsg_recv(msg
, skb
);
1898 /* If skb's length exceeds the user's buffer, update the skb and
1899 * push it back to the receive_queue so that the next call to
1900 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1902 if (skb_len
> copied
) {
1903 msg
->msg_flags
&= ~MSG_EOR
;
1904 if (flags
& MSG_PEEK
)
1906 sctp_skb_pull(skb
, copied
);
1907 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1909 /* When only partial message is copied to the user, increase
1910 * rwnd by that amount. If all the data in the skb is read,
1911 * rwnd is updated when the event is freed.
1913 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
1915 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
1916 (event
->msg_flags
& MSG_EOR
))
1917 msg
->msg_flags
|= MSG_EOR
;
1919 msg
->msg_flags
&= ~MSG_EOR
;
1922 if (flags
& MSG_PEEK
) {
1923 /* Release the skb reference acquired after peeking the skb in
1924 * sctp_skb_recv_datagram().
1928 /* Free the event which includes releasing the reference to
1929 * the owner of the skb, freeing the skb and updating the
1932 sctp_ulpevent_free(event
);
1935 sctp_release_sock(sk
);
1939 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1941 * This option is a on/off flag. If enabled no SCTP message
1942 * fragmentation will be performed. Instead if a message being sent
1943 * exceeds the current PMTU size, the message will NOT be sent and
1944 * instead a error will be indicated to the user.
1946 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
1947 char __user
*optval
, int optlen
)
1951 if (optlen
< sizeof(int))
1954 if (get_user(val
, (int __user
*)optval
))
1957 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
1962 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
1965 if (optlen
!= sizeof(struct sctp_event_subscribe
))
1967 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
1972 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
1974 * This socket option is applicable to the UDP-style socket only. When
1975 * set it will cause associations that are idle for more than the
1976 * specified number of seconds to automatically close. An association
1977 * being idle is defined an association that has NOT sent or received
1978 * user data. The special value of '0' indicates that no automatic
1979 * close of any associations should be performed. The option expects an
1980 * integer defining the number of seconds of idle time before an
1981 * association is closed.
1983 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
1986 struct sctp_sock
*sp
= sctp_sk(sk
);
1988 /* Applicable to UDP-style socket only */
1989 if (sctp_style(sk
, TCP
))
1991 if (optlen
!= sizeof(int))
1993 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
1999 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2001 * Applications can enable or disable heartbeats for any peer address of
2002 * an association, modify an address's heartbeat interval, force a
2003 * heartbeat to be sent immediately, and adjust the address's maximum
2004 * number of retransmissions sent before an address is considered
2005 * unreachable. The following structure is used to access and modify an
2006 * address's parameters:
2008 * struct sctp_paddrparams {
2009 * sctp_assoc_t spp_assoc_id;
2010 * struct sockaddr_storage spp_address;
2011 * uint32_t spp_hbinterval;
2012 * uint16_t spp_pathmaxrxt;
2013 * uint32_t spp_pathmtu;
2014 * uint32_t spp_sackdelay;
2015 * uint32_t spp_flags;
2018 * spp_assoc_id - (one-to-many style socket) This is filled in the
2019 * application, and identifies the association for
2021 * spp_address - This specifies which address is of interest.
2022 * spp_hbinterval - This contains the value of the heartbeat interval,
2023 * in milliseconds. If a value of zero
2024 * is present in this field then no changes are to
2025 * be made to this parameter.
2026 * spp_pathmaxrxt - This contains the maximum number of
2027 * retransmissions before this address shall be
2028 * considered unreachable. If a value of zero
2029 * is present in this field then no changes are to
2030 * be made to this parameter.
2031 * spp_pathmtu - When Path MTU discovery is disabled the value
2032 * specified here will be the "fixed" path mtu.
2033 * Note that if the spp_address field is empty
2034 * then all associations on this address will
2035 * have this fixed path mtu set upon them.
2037 * spp_sackdelay - When delayed sack is enabled, this value specifies
2038 * the number of milliseconds that sacks will be delayed
2039 * for. This value will apply to all addresses of an
2040 * association if the spp_address field is empty. Note
2041 * also, that if delayed sack is enabled and this
2042 * value is set to 0, no change is made to the last
2043 * recorded delayed sack timer value.
2045 * spp_flags - These flags are used to control various features
2046 * on an association. The flag field may contain
2047 * zero or more of the following options.
2049 * SPP_HB_ENABLE - Enable heartbeats on the
2050 * specified address. Note that if the address
2051 * field is empty all addresses for the association
2052 * have heartbeats enabled upon them.
2054 * SPP_HB_DISABLE - Disable heartbeats on the
2055 * speicifed address. Note that if the address
2056 * field is empty all addresses for the association
2057 * will have their heartbeats disabled. Note also
2058 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2059 * mutually exclusive, only one of these two should
2060 * be specified. Enabling both fields will have
2061 * undetermined results.
2063 * SPP_HB_DEMAND - Request a user initiated heartbeat
2064 * to be made immediately.
2066 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2067 * heartbeat delayis to be set to the value of 0
2070 * SPP_PMTUD_ENABLE - This field will enable PMTU
2071 * discovery upon the specified address. Note that
2072 * if the address feild is empty then all addresses
2073 * on the association are effected.
2075 * SPP_PMTUD_DISABLE - This field will disable PMTU
2076 * discovery upon the specified address. Note that
2077 * if the address feild is empty then all addresses
2078 * on the association are effected. Not also that
2079 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2080 * exclusive. Enabling both will have undetermined
2083 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2084 * on delayed sack. The time specified in spp_sackdelay
2085 * is used to specify the sack delay for this address. Note
2086 * that if spp_address is empty then all addresses will
2087 * enable delayed sack and take on the sack delay
2088 * value specified in spp_sackdelay.
2089 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2090 * off delayed sack. If the spp_address field is blank then
2091 * delayed sack is disabled for the entire association. Note
2092 * also that this field is mutually exclusive to
2093 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2096 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2097 struct sctp_transport
*trans
,
2098 struct sctp_association
*asoc
,
2099 struct sctp_sock
*sp
,
2102 int sackdelay_change
)
2106 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2107 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2112 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2113 * this field is ignored. Note also that a value of zero indicates
2114 * the current setting should be left unchanged.
2116 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2118 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2119 * set. This lets us use 0 value when this flag
2122 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2123 params
->spp_hbinterval
= 0;
2125 if (params
->spp_hbinterval
||
2126 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2129 msecs_to_jiffies(params
->spp_hbinterval
);
2132 msecs_to_jiffies(params
->spp_hbinterval
);
2134 sp
->hbinterval
= params
->spp_hbinterval
;
2141 trans
->param_flags
=
2142 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2145 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2148 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2152 /* When Path MTU discovery is disabled the value specified here will
2153 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2154 * include the flag SPP_PMTUD_DISABLE for this field to have any
2157 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2159 trans
->pathmtu
= params
->spp_pathmtu
;
2160 sctp_assoc_sync_pmtu(asoc
);
2162 asoc
->pathmtu
= params
->spp_pathmtu
;
2163 sctp_frag_point(sp
, params
->spp_pathmtu
);
2165 sp
->pathmtu
= params
->spp_pathmtu
;
2171 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2172 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2173 trans
->param_flags
=
2174 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2176 sctp_transport_pmtu(trans
);
2177 sctp_assoc_sync_pmtu(asoc
);
2181 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2184 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2188 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2189 * value of this field is ignored. Note also that a value of zero
2190 * indicates the current setting should be left unchanged.
2192 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2195 msecs_to_jiffies(params
->spp_sackdelay
);
2198 msecs_to_jiffies(params
->spp_sackdelay
);
2200 sp
->sackdelay
= params
->spp_sackdelay
;
2204 if (sackdelay_change
) {
2206 trans
->param_flags
=
2207 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2211 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2215 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2220 /* Note that unless the spp_flag is set to SPP_PMTUD_ENABLE the value
2221 * of this field is ignored. Note also that a value of zero
2222 * indicates the current setting should be left unchanged.
2224 if ((params
->spp_flags
& SPP_PMTUD_ENABLE
) && params
->spp_pathmaxrxt
) {
2226 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2228 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2230 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2237 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2238 char __user
*optval
, int optlen
)
2240 struct sctp_paddrparams params
;
2241 struct sctp_transport
*trans
= NULL
;
2242 struct sctp_association
*asoc
= NULL
;
2243 struct sctp_sock
*sp
= sctp_sk(sk
);
2245 int hb_change
, pmtud_change
, sackdelay_change
;
2247 if (optlen
!= sizeof(struct sctp_paddrparams
))
2250 if (copy_from_user(¶ms
, optval
, optlen
))
2253 /* Validate flags and value parameters. */
2254 hb_change
= params
.spp_flags
& SPP_HB
;
2255 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2256 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2258 if (hb_change
== SPP_HB
||
2259 pmtud_change
== SPP_PMTUD
||
2260 sackdelay_change
== SPP_SACKDELAY
||
2261 params
.spp_sackdelay
> 500 ||
2263 && params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2266 /* If an address other than INADDR_ANY is specified, and
2267 * no transport is found, then the request is invalid.
2269 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
2270 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2271 params
.spp_assoc_id
);
2276 /* Get association, if assoc_id != 0 and the socket is a one
2277 * to many style socket, and an association was not found, then
2278 * the id was invalid.
2280 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2281 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2284 /* Heartbeat demand can only be sent on a transport or
2285 * association, but not a socket.
2287 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2290 /* Process parameters. */
2291 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2292 hb_change
, pmtud_change
,
2298 /* If changes are for association, also apply parameters to each
2301 if (!trans
&& asoc
) {
2302 struct list_head
*pos
;
2304 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2305 trans
= list_entry(pos
, struct sctp_transport
,
2307 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2308 hb_change
, pmtud_change
,
2316 /* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
2318 * This options will get or set the delayed ack timer. The time is set
2319 * in milliseconds. If the assoc_id is 0, then this sets or gets the
2320 * endpoints default delayed ack timer value. If the assoc_id field is
2321 * non-zero, then the set or get effects the specified association.
2323 * struct sctp_assoc_value {
2324 * sctp_assoc_t assoc_id;
2325 * uint32_t assoc_value;
2328 * assoc_id - This parameter, indicates which association the
2329 * user is preforming an action upon. Note that if
2330 * this field's value is zero then the endpoints
2331 * default value is changed (effecting future
2332 * associations only).
2334 * assoc_value - This parameter contains the number of milliseconds
2335 * that the user is requesting the delayed ACK timer
2336 * be set to. Note that this value is defined in
2337 * the standard to be between 200 and 500 milliseconds.
2339 * Note: a value of zero will leave the value alone,
2340 * but disable SACK delay. A non-zero value will also
2341 * enable SACK delay.
2344 static int sctp_setsockopt_delayed_ack_time(struct sock
*sk
,
2345 char __user
*optval
, int optlen
)
2347 struct sctp_assoc_value params
;
2348 struct sctp_transport
*trans
= NULL
;
2349 struct sctp_association
*asoc
= NULL
;
2350 struct sctp_sock
*sp
= sctp_sk(sk
);
2352 if (optlen
!= sizeof(struct sctp_assoc_value
))
2355 if (copy_from_user(¶ms
, optval
, optlen
))
2358 /* Validate value parameter. */
2359 if (params
.assoc_value
> 500)
2362 /* Get association, if assoc_id != 0 and the socket is a one
2363 * to many style socket, and an association was not found, then
2364 * the id was invalid.
2366 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2367 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
2370 if (params
.assoc_value
) {
2373 msecs_to_jiffies(params
.assoc_value
);
2375 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2376 SPP_SACKDELAY_ENABLE
;
2378 sp
->sackdelay
= params
.assoc_value
;
2380 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2381 SPP_SACKDELAY_ENABLE
;
2386 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2387 SPP_SACKDELAY_DISABLE
;
2390 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2391 SPP_SACKDELAY_DISABLE
;
2395 /* If change is for association, also apply to each transport. */
2397 struct list_head
*pos
;
2399 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2400 trans
= list_entry(pos
, struct sctp_transport
,
2402 if (params
.assoc_value
) {
2404 msecs_to_jiffies(params
.assoc_value
);
2405 trans
->param_flags
=
2406 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2407 SPP_SACKDELAY_ENABLE
;
2409 trans
->param_flags
=
2410 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2411 SPP_SACKDELAY_DISABLE
;
2419 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2421 * Applications can specify protocol parameters for the default association
2422 * initialization. The option name argument to setsockopt() and getsockopt()
2425 * Setting initialization parameters is effective only on an unconnected
2426 * socket (for UDP-style sockets only future associations are effected
2427 * by the change). With TCP-style sockets, this option is inherited by
2428 * sockets derived from a listener socket.
2430 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, int optlen
)
2432 struct sctp_initmsg sinit
;
2433 struct sctp_sock
*sp
= sctp_sk(sk
);
2435 if (optlen
!= sizeof(struct sctp_initmsg
))
2437 if (copy_from_user(&sinit
, optval
, optlen
))
2440 if (sinit
.sinit_num_ostreams
)
2441 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2442 if (sinit
.sinit_max_instreams
)
2443 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2444 if (sinit
.sinit_max_attempts
)
2445 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2446 if (sinit
.sinit_max_init_timeo
)
2447 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2453 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2455 * Applications that wish to use the sendto() system call may wish to
2456 * specify a default set of parameters that would normally be supplied
2457 * through the inclusion of ancillary data. This socket option allows
2458 * such an application to set the default sctp_sndrcvinfo structure.
2459 * The application that wishes to use this socket option simply passes
2460 * in to this call the sctp_sndrcvinfo structure defined in Section
2461 * 5.2.2) The input parameters accepted by this call include
2462 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2463 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2464 * to this call if the caller is using the UDP model.
2466 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2467 char __user
*optval
, int optlen
)
2469 struct sctp_sndrcvinfo info
;
2470 struct sctp_association
*asoc
;
2471 struct sctp_sock
*sp
= sctp_sk(sk
);
2473 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2475 if (copy_from_user(&info
, optval
, optlen
))
2478 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2479 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2483 asoc
->default_stream
= info
.sinfo_stream
;
2484 asoc
->default_flags
= info
.sinfo_flags
;
2485 asoc
->default_ppid
= info
.sinfo_ppid
;
2486 asoc
->default_context
= info
.sinfo_context
;
2487 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2489 sp
->default_stream
= info
.sinfo_stream
;
2490 sp
->default_flags
= info
.sinfo_flags
;
2491 sp
->default_ppid
= info
.sinfo_ppid
;
2492 sp
->default_context
= info
.sinfo_context
;
2493 sp
->default_timetolive
= info
.sinfo_timetolive
;
2499 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2501 * Requests that the local SCTP stack use the enclosed peer address as
2502 * the association primary. The enclosed address must be one of the
2503 * association peer's addresses.
2505 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2508 struct sctp_prim prim
;
2509 struct sctp_transport
*trans
;
2511 if (optlen
!= sizeof(struct sctp_prim
))
2514 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2517 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2521 sctp_assoc_set_primary(trans
->asoc
, trans
);
2527 * 7.1.5 SCTP_NODELAY
2529 * Turn on/off any Nagle-like algorithm. This means that packets are
2530 * generally sent as soon as possible and no unnecessary delays are
2531 * introduced, at the cost of more packets in the network. Expects an
2532 * integer boolean flag.
2534 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2539 if (optlen
< sizeof(int))
2541 if (get_user(val
, (int __user
*)optval
))
2544 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2550 * 7.1.1 SCTP_RTOINFO
2552 * The protocol parameters used to initialize and bound retransmission
2553 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2554 * and modify these parameters.
2555 * All parameters are time values, in milliseconds. A value of 0, when
2556 * modifying the parameters, indicates that the current value should not
2560 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, int optlen
) {
2561 struct sctp_rtoinfo rtoinfo
;
2562 struct sctp_association
*asoc
;
2564 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2567 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2570 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2572 /* Set the values to the specific association */
2573 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2577 if (rtoinfo
.srto_initial
!= 0)
2579 msecs_to_jiffies(rtoinfo
.srto_initial
);
2580 if (rtoinfo
.srto_max
!= 0)
2581 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2582 if (rtoinfo
.srto_min
!= 0)
2583 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2585 /* If there is no association or the association-id = 0
2586 * set the values to the endpoint.
2588 struct sctp_sock
*sp
= sctp_sk(sk
);
2590 if (rtoinfo
.srto_initial
!= 0)
2591 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2592 if (rtoinfo
.srto_max
!= 0)
2593 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2594 if (rtoinfo
.srto_min
!= 0)
2595 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2603 * 7.1.2 SCTP_ASSOCINFO
2605 * This option is used to tune the maximum retransmission attempts
2606 * of the association.
2607 * Returns an error if the new association retransmission value is
2608 * greater than the sum of the retransmission value of the peer.
2609 * See [SCTP] for more information.
2612 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, int optlen
)
2615 struct sctp_assocparams assocparams
;
2616 struct sctp_association
*asoc
;
2618 if (optlen
!= sizeof(struct sctp_assocparams
))
2620 if (copy_from_user(&assocparams
, optval
, optlen
))
2623 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2625 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2628 /* Set the values to the specific association */
2630 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2633 struct list_head
*pos
;
2634 struct sctp_transport
*peer_addr
;
2636 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2637 peer_addr
= list_entry(pos
,
2638 struct sctp_transport
,
2640 path_sum
+= peer_addr
->pathmaxrxt
;
2644 /* Only validate asocmaxrxt if we have more then
2645 * one path/transport. We do this because path
2646 * retransmissions are only counted when we have more
2650 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2653 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2656 if (assocparams
.sasoc_cookie_life
!= 0) {
2657 asoc
->cookie_life
.tv_sec
=
2658 assocparams
.sasoc_cookie_life
/ 1000;
2659 asoc
->cookie_life
.tv_usec
=
2660 (assocparams
.sasoc_cookie_life
% 1000)
2664 /* Set the values to the endpoint */
2665 struct sctp_sock
*sp
= sctp_sk(sk
);
2667 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2668 sp
->assocparams
.sasoc_asocmaxrxt
=
2669 assocparams
.sasoc_asocmaxrxt
;
2670 if (assocparams
.sasoc_cookie_life
!= 0)
2671 sp
->assocparams
.sasoc_cookie_life
=
2672 assocparams
.sasoc_cookie_life
;
2678 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2680 * This socket option is a boolean flag which turns on or off mapped V4
2681 * addresses. If this option is turned on and the socket is type
2682 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2683 * If this option is turned off, then no mapping will be done of V4
2684 * addresses and a user will receive both PF_INET6 and PF_INET type
2685 * addresses on the socket.
2687 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, int optlen
)
2690 struct sctp_sock
*sp
= sctp_sk(sk
);
2692 if (optlen
< sizeof(int))
2694 if (get_user(val
, (int __user
*)optval
))
2705 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2707 * This socket option specifies the maximum size to put in any outgoing
2708 * SCTP chunk. If a message is larger than this size it will be
2709 * fragmented by SCTP into the specified size. Note that the underlying
2710 * SCTP implementation may fragment into smaller sized chunks when the
2711 * PMTU of the underlying association is smaller than the value set by
2714 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, int optlen
)
2716 struct sctp_association
*asoc
;
2717 struct list_head
*pos
;
2718 struct sctp_sock
*sp
= sctp_sk(sk
);
2721 if (optlen
< sizeof(int))
2723 if (get_user(val
, (int __user
*)optval
))
2725 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2727 sp
->user_frag
= val
;
2729 /* Update the frag_point of the existing associations. */
2730 list_for_each(pos
, &(sp
->ep
->asocs
)) {
2731 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
2732 asoc
->frag_point
= sctp_frag_point(sp
, asoc
->pathmtu
);
2740 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2742 * Requests that the peer mark the enclosed address as the association
2743 * primary. The enclosed address must be one of the association's
2744 * locally bound addresses. The following structure is used to make a
2745 * set primary request:
2747 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2750 struct sctp_sock
*sp
;
2751 struct sctp_endpoint
*ep
;
2752 struct sctp_association
*asoc
= NULL
;
2753 struct sctp_setpeerprim prim
;
2754 struct sctp_chunk
*chunk
;
2760 if (!sctp_addip_enable
)
2763 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2766 if (copy_from_user(&prim
, optval
, optlen
))
2769 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2773 if (!asoc
->peer
.asconf_capable
)
2776 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2779 if (!sctp_state(asoc
, ESTABLISHED
))
2782 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2783 return -EADDRNOTAVAIL
;
2785 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2786 chunk
= sctp_make_asconf_set_prim(asoc
,
2787 (union sctp_addr
*)&prim
.sspp_addr
);
2791 err
= sctp_send_asconf(asoc
, chunk
);
2793 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2798 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
2801 struct sctp_setadaptation adaptation
;
2803 if (optlen
!= sizeof(struct sctp_setadaptation
))
2805 if (copy_from_user(&adaptation
, optval
, optlen
))
2808 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
2814 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2816 * The context field in the sctp_sndrcvinfo structure is normally only
2817 * used when a failed message is retrieved holding the value that was
2818 * sent down on the actual send call. This option allows the setting of
2819 * a default context on an association basis that will be received on
2820 * reading messages from the peer. This is especially helpful in the
2821 * one-2-many model for an application to keep some reference to an
2822 * internal state machine that is processing messages on the
2823 * association. Note that the setting of this value only effects
2824 * received messages from the peer and does not effect the value that is
2825 * saved with outbound messages.
2827 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
2830 struct sctp_assoc_value params
;
2831 struct sctp_sock
*sp
;
2832 struct sctp_association
*asoc
;
2834 if (optlen
!= sizeof(struct sctp_assoc_value
))
2836 if (copy_from_user(¶ms
, optval
, optlen
))
2841 if (params
.assoc_id
!= 0) {
2842 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2845 asoc
->default_rcv_context
= params
.assoc_value
;
2847 sp
->default_rcv_context
= params
.assoc_value
;
2854 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
2856 * This options will at a minimum specify if the implementation is doing
2857 * fragmented interleave. Fragmented interleave, for a one to many
2858 * socket, is when subsequent calls to receive a message may return
2859 * parts of messages from different associations. Some implementations
2860 * may allow you to turn this value on or off. If so, when turned off,
2861 * no fragment interleave will occur (which will cause a head of line
2862 * blocking amongst multiple associations sharing the same one to many
2863 * socket). When this option is turned on, then each receive call may
2864 * come from a different association (thus the user must receive data
2865 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
2866 * association each receive belongs to.
2868 * This option takes a boolean value. A non-zero value indicates that
2869 * fragmented interleave is on. A value of zero indicates that
2870 * fragmented interleave is off.
2872 * Note that it is important that an implementation that allows this
2873 * option to be turned on, have it off by default. Otherwise an unaware
2874 * application using the one to many model may become confused and act
2877 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
2878 char __user
*optval
,
2883 if (optlen
!= sizeof(int))
2885 if (get_user(val
, (int __user
*)optval
))
2888 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
2894 * 7.1.25. Set or Get the sctp partial delivery point
2895 * (SCTP_PARTIAL_DELIVERY_POINT)
2896 * This option will set or get the SCTP partial delivery point. This
2897 * point is the size of a message where the partial delivery API will be
2898 * invoked to help free up rwnd space for the peer. Setting this to a
2899 * lower value will cause partial delivery's to happen more often. The
2900 * calls argument is an integer that sets or gets the partial delivery
2903 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
2904 char __user
*optval
,
2909 if (optlen
!= sizeof(u32
))
2911 if (get_user(val
, (int __user
*)optval
))
2914 sctp_sk(sk
)->pd_point
= val
;
2916 return 0; /* is this the right error code? */
2920 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
2922 * This option will allow a user to change the maximum burst of packets
2923 * that can be emitted by this association. Note that the default value
2924 * is 4, and some implementations may restrict this setting so that it
2925 * can only be lowered.
2927 * NOTE: This text doesn't seem right. Do this on a socket basis with
2928 * future associations inheriting the socket value.
2930 static int sctp_setsockopt_maxburst(struct sock
*sk
,
2931 char __user
*optval
,
2936 if (optlen
!= sizeof(int))
2938 if (get_user(val
, (int __user
*)optval
))
2944 sctp_sk(sk
)->max_burst
= val
;
2950 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
2952 * This set option adds a chunk type that the user is requesting to be
2953 * received only in an authenticated way. Changes to the list of chunks
2954 * will only effect future associations on the socket.
2956 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
2957 char __user
*optval
,
2960 struct sctp_authchunk val
;
2962 if (optlen
!= sizeof(struct sctp_authchunk
))
2964 if (copy_from_user(&val
, optval
, optlen
))
2967 switch (val
.sauth_chunk
) {
2969 case SCTP_CID_INIT_ACK
:
2970 case SCTP_CID_SHUTDOWN_COMPLETE
:
2975 /* add this chunk id to the endpoint */
2976 return sctp_auth_ep_add_chunkid(sctp_sk(sk
)->ep
, val
.sauth_chunk
);
2980 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
2982 * This option gets or sets the list of HMAC algorithms that the local
2983 * endpoint requires the peer to use.
2985 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
2986 char __user
*optval
,
2989 struct sctp_hmacalgo
*hmacs
;
2992 if (optlen
< sizeof(struct sctp_hmacalgo
))
2995 hmacs
= kmalloc(optlen
, GFP_KERNEL
);
2999 if (copy_from_user(hmacs
, optval
, optlen
)) {
3004 if (hmacs
->shmac_num_idents
== 0 ||
3005 hmacs
->shmac_num_idents
> SCTP_AUTH_NUM_HMACS
) {
3010 err
= sctp_auth_ep_set_hmacs(sctp_sk(sk
)->ep
, hmacs
);
3017 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3019 * This option will set a shared secret key which is used to build an
3020 * association shared key.
3022 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3023 char __user
*optval
,
3026 struct sctp_authkey
*authkey
;
3027 struct sctp_association
*asoc
;
3030 if (optlen
<= sizeof(struct sctp_authkey
))
3033 authkey
= kmalloc(optlen
, GFP_KERNEL
);
3037 if (copy_from_user(authkey
, optval
, optlen
)) {
3042 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3043 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3048 ret
= sctp_auth_set_key(sctp_sk(sk
)->ep
, asoc
, authkey
);
3055 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3057 * This option will get or set the active shared key to be used to build
3058 * the association shared key.
3060 static int sctp_setsockopt_active_key(struct sock
*sk
,
3061 char __user
*optval
,
3064 struct sctp_authkeyid val
;
3065 struct sctp_association
*asoc
;
3067 if (optlen
!= sizeof(struct sctp_authkeyid
))
3069 if (copy_from_user(&val
, optval
, optlen
))
3072 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3073 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3076 return sctp_auth_set_active_key(sctp_sk(sk
)->ep
, asoc
,
3077 val
.scact_keynumber
);
3081 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3083 * This set option will delete a shared secret key from use.
3085 static int sctp_setsockopt_del_key(struct sock
*sk
,
3086 char __user
*optval
,
3089 struct sctp_authkeyid val
;
3090 struct sctp_association
*asoc
;
3092 if (optlen
!= sizeof(struct sctp_authkeyid
))
3094 if (copy_from_user(&val
, optval
, optlen
))
3097 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3098 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3101 return sctp_auth_del_key_id(sctp_sk(sk
)->ep
, asoc
,
3102 val
.scact_keynumber
);
3107 /* API 6.2 setsockopt(), getsockopt()
3109 * Applications use setsockopt() and getsockopt() to set or retrieve
3110 * socket options. Socket options are used to change the default
3111 * behavior of sockets calls. They are described in Section 7.
3115 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3116 * int __user *optlen);
3117 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3120 * sd - the socket descript.
3121 * level - set to IPPROTO_SCTP for all SCTP options.
3122 * optname - the option name.
3123 * optval - the buffer to store the value of the option.
3124 * optlen - the size of the buffer.
3126 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3127 char __user
*optval
, int optlen
)
3131 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3134 /* I can hardly begin to describe how wrong this is. This is
3135 * so broken as to be worse than useless. The API draft
3136 * REALLY is NOT helpful here... I am not convinced that the
3137 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3138 * are at all well-founded.
3140 if (level
!= SOL_SCTP
) {
3141 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3142 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3149 case SCTP_SOCKOPT_BINDX_ADD
:
3150 /* 'optlen' is the size of the addresses buffer. */
3151 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3152 optlen
, SCTP_BINDX_ADD_ADDR
);
3155 case SCTP_SOCKOPT_BINDX_REM
:
3156 /* 'optlen' is the size of the addresses buffer. */
3157 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3158 optlen
, SCTP_BINDX_REM_ADDR
);
3161 case SCTP_SOCKOPT_CONNECTX
:
3162 /* 'optlen' is the size of the addresses buffer. */
3163 retval
= sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)optval
,
3167 case SCTP_DISABLE_FRAGMENTS
:
3168 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3172 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3175 case SCTP_AUTOCLOSE
:
3176 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3179 case SCTP_PEER_ADDR_PARAMS
:
3180 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3183 case SCTP_DELAYED_ACK_TIME
:
3184 retval
= sctp_setsockopt_delayed_ack_time(sk
, optval
, optlen
);
3186 case SCTP_PARTIAL_DELIVERY_POINT
:
3187 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3191 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3193 case SCTP_DEFAULT_SEND_PARAM
:
3194 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3197 case SCTP_PRIMARY_ADDR
:
3198 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3200 case SCTP_SET_PEER_PRIMARY_ADDR
:
3201 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3204 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3207 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3209 case SCTP_ASSOCINFO
:
3210 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3212 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3213 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3216 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3218 case SCTP_ADAPTATION_LAYER
:
3219 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3222 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3224 case SCTP_FRAGMENT_INTERLEAVE
:
3225 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3227 case SCTP_MAX_BURST
:
3228 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3230 case SCTP_AUTH_CHUNK
:
3231 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3233 case SCTP_HMAC_IDENT
:
3234 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3237 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3239 case SCTP_AUTH_ACTIVE_KEY
:
3240 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3242 case SCTP_AUTH_DELETE_KEY
:
3243 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3246 retval
= -ENOPROTOOPT
;
3250 sctp_release_sock(sk
);
3256 /* API 3.1.6 connect() - UDP Style Syntax
3258 * An application may use the connect() call in the UDP model to initiate an
3259 * association without sending data.
3263 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3265 * sd: the socket descriptor to have a new association added to.
3267 * nam: the address structure (either struct sockaddr_in or struct
3268 * sockaddr_in6 defined in RFC2553 [7]).
3270 * len: the size of the address.
3272 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3280 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3281 __FUNCTION__
, sk
, addr
, addr_len
);
3283 /* Validate addr_len before calling common connect/connectx routine. */
3284 af
= sctp_get_af_specific(addr
->sa_family
);
3285 if (!af
|| addr_len
< af
->sockaddr_len
) {
3288 /* Pass correct addr len to common routine (so it knows there
3289 * is only one address being passed.
3291 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
);
3294 sctp_release_sock(sk
);
3298 /* FIXME: Write comments. */
3299 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
3301 return -EOPNOTSUPP
; /* STUB */
3304 /* 4.1.4 accept() - TCP Style Syntax
3306 * Applications use accept() call to remove an established SCTP
3307 * association from the accept queue of the endpoint. A new socket
3308 * descriptor will be returned from accept() to represent the newly
3309 * formed association.
3311 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3313 struct sctp_sock
*sp
;
3314 struct sctp_endpoint
*ep
;
3315 struct sock
*newsk
= NULL
;
3316 struct sctp_association
*asoc
;
3325 if (!sctp_style(sk
, TCP
)) {
3326 error
= -EOPNOTSUPP
;
3330 if (!sctp_sstate(sk
, LISTENING
)) {
3335 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3337 error
= sctp_wait_for_accept(sk
, timeo
);
3341 /* We treat the list of associations on the endpoint as the accept
3342 * queue and pick the first association on the list.
3344 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3346 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3352 /* Populate the fields of the newsk from the oldsk and migrate the
3353 * asoc to the newsk.
3355 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3358 sctp_release_sock(sk
);
3363 /* The SCTP ioctl handler. */
3364 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3366 return -ENOIOCTLCMD
;
3369 /* This is the function which gets called during socket creation to
3370 * initialized the SCTP-specific portion of the sock.
3371 * The sock structure should already be zero-filled memory.
3373 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
3375 struct sctp_endpoint
*ep
;
3376 struct sctp_sock
*sp
;
3378 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3382 /* Initialize the SCTP per socket area. */
3383 switch (sk
->sk_type
) {
3384 case SOCK_SEQPACKET
:
3385 sp
->type
= SCTP_SOCKET_UDP
;
3388 sp
->type
= SCTP_SOCKET_TCP
;
3391 return -ESOCKTNOSUPPORT
;
3394 /* Initialize default send parameters. These parameters can be
3395 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3397 sp
->default_stream
= 0;
3398 sp
->default_ppid
= 0;
3399 sp
->default_flags
= 0;
3400 sp
->default_context
= 0;
3401 sp
->default_timetolive
= 0;
3403 sp
->default_rcv_context
= 0;
3404 sp
->max_burst
= sctp_max_burst
;
3406 /* Initialize default setup parameters. These parameters
3407 * can be modified with the SCTP_INITMSG socket option or
3408 * overridden by the SCTP_INIT CMSG.
3410 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3411 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3412 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3413 sp
->initmsg
.sinit_max_init_timeo
= sctp_rto_max
;
3415 /* Initialize default RTO related parameters. These parameters can
3416 * be modified for with the SCTP_RTOINFO socket option.
3418 sp
->rtoinfo
.srto_initial
= sctp_rto_initial
;
3419 sp
->rtoinfo
.srto_max
= sctp_rto_max
;
3420 sp
->rtoinfo
.srto_min
= sctp_rto_min
;
3422 /* Initialize default association related parameters. These parameters
3423 * can be modified with the SCTP_ASSOCINFO socket option.
3425 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3426 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3427 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3428 sp
->assocparams
.sasoc_local_rwnd
= 0;
3429 sp
->assocparams
.sasoc_cookie_life
= sctp_valid_cookie_life
;
3431 /* Initialize default event subscriptions. By default, all the
3434 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3436 /* Default Peer Address Parameters. These defaults can
3437 * be modified via SCTP_PEER_ADDR_PARAMS
3439 sp
->hbinterval
= sctp_hb_interval
;
3440 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3441 sp
->pathmtu
= 0; // allow default discovery
3442 sp
->sackdelay
= sctp_sack_timeout
;
3443 sp
->param_flags
= SPP_HB_ENABLE
|
3445 SPP_SACKDELAY_ENABLE
;
3447 /* If enabled no SCTP message fragmentation will be performed.
3448 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3450 sp
->disable_fragments
= 0;
3452 /* Enable Nagle algorithm by default. */
3455 /* Enable by default. */
3458 /* Auto-close idle associations after the configured
3459 * number of seconds. A value of 0 disables this
3460 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3461 * for UDP-style sockets only.
3465 /* User specified fragmentation limit. */
3468 sp
->adaptation_ind
= 0;
3470 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3472 /* Control variables for partial data delivery. */
3473 atomic_set(&sp
->pd_mode
, 0);
3474 skb_queue_head_init(&sp
->pd_lobby
);
3475 sp
->frag_interleave
= 0;
3477 /* Create a per socket endpoint structure. Even if we
3478 * change the data structure relationships, this may still
3479 * be useful for storing pre-connect address information.
3481 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3488 SCTP_DBG_OBJCNT_INC(sock
);
3489 atomic_inc(&sctp_sockets_allocated
);
3493 /* Cleanup any SCTP per socket resources. */
3494 SCTP_STATIC
int sctp_destroy_sock(struct sock
*sk
)
3496 struct sctp_endpoint
*ep
;
3498 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3500 /* Release our hold on the endpoint. */
3501 ep
= sctp_sk(sk
)->ep
;
3502 sctp_endpoint_free(ep
);
3503 atomic_dec(&sctp_sockets_allocated
);
3507 /* API 4.1.7 shutdown() - TCP Style Syntax
3508 * int shutdown(int socket, int how);
3510 * sd - the socket descriptor of the association to be closed.
3511 * how - Specifies the type of shutdown. The values are
3514 * Disables further receive operations. No SCTP
3515 * protocol action is taken.
3517 * Disables further send operations, and initiates
3518 * the SCTP shutdown sequence.
3520 * Disables further send and receive operations
3521 * and initiates the SCTP shutdown sequence.
3523 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3525 struct sctp_endpoint
*ep
;
3526 struct sctp_association
*asoc
;
3528 if (!sctp_style(sk
, TCP
))
3531 if (how
& SEND_SHUTDOWN
) {
3532 ep
= sctp_sk(sk
)->ep
;
3533 if (!list_empty(&ep
->asocs
)) {
3534 asoc
= list_entry(ep
->asocs
.next
,
3535 struct sctp_association
, asocs
);
3536 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3541 /* 7.2.1 Association Status (SCTP_STATUS)
3543 * Applications can retrieve current status information about an
3544 * association, including association state, peer receiver window size,
3545 * number of unacked data chunks, and number of data chunks pending
3546 * receipt. This information is read-only.
3548 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3549 char __user
*optval
,
3552 struct sctp_status status
;
3553 struct sctp_association
*asoc
= NULL
;
3554 struct sctp_transport
*transport
;
3555 sctp_assoc_t associd
;
3558 if (len
< sizeof(status
)) {
3563 len
= sizeof(status
);
3564 if (copy_from_user(&status
, optval
, len
)) {
3569 associd
= status
.sstat_assoc_id
;
3570 asoc
= sctp_id2assoc(sk
, associd
);
3576 transport
= asoc
->peer
.primary_path
;
3578 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3579 status
.sstat_state
= asoc
->state
;
3580 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3581 status
.sstat_unackdata
= asoc
->unack_data
;
3583 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3584 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3585 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3586 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3587 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3588 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
3589 transport
->af_specific
->sockaddr_len
);
3590 /* Map ipv4 address into v4-mapped-on-v6 address. */
3591 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3592 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3593 status
.sstat_primary
.spinfo_state
= transport
->state
;
3594 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3595 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3596 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3597 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3599 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3600 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3602 if (put_user(len
, optlen
)) {
3607 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3608 len
, status
.sstat_state
, status
.sstat_rwnd
,
3609 status
.sstat_assoc_id
);
3611 if (copy_to_user(optval
, &status
, len
)) {
3621 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3623 * Applications can retrieve information about a specific peer address
3624 * of an association, including its reachability state, congestion
3625 * window, and retransmission timer values. This information is
3628 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3629 char __user
*optval
,
3632 struct sctp_paddrinfo pinfo
;
3633 struct sctp_transport
*transport
;
3636 if (len
< sizeof(pinfo
)) {
3641 len
= sizeof(pinfo
);
3642 if (copy_from_user(&pinfo
, optval
, len
)) {
3647 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3648 pinfo
.spinfo_assoc_id
);
3652 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3653 pinfo
.spinfo_state
= transport
->state
;
3654 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3655 pinfo
.spinfo_srtt
= transport
->srtt
;
3656 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3657 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3659 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3660 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3662 if (put_user(len
, optlen
)) {
3667 if (copy_to_user(optval
, &pinfo
, len
)) {
3676 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3678 * This option is a on/off flag. If enabled no SCTP message
3679 * fragmentation will be performed. Instead if a message being sent
3680 * exceeds the current PMTU size, the message will NOT be sent and
3681 * instead a error will be indicated to the user.
3683 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3684 char __user
*optval
, int __user
*optlen
)
3688 if (len
< sizeof(int))
3692 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3693 if (put_user(len
, optlen
))
3695 if (copy_to_user(optval
, &val
, len
))
3700 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3702 * This socket option is used to specify various notifications and
3703 * ancillary data the user wishes to receive.
3705 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
3708 if (len
< sizeof(struct sctp_event_subscribe
))
3710 len
= sizeof(struct sctp_event_subscribe
);
3711 if (put_user(len
, optlen
))
3713 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
3718 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3720 * This socket option is applicable to the UDP-style socket only. When
3721 * set it will cause associations that are idle for more than the
3722 * specified number of seconds to automatically close. An association
3723 * being idle is defined an association that has NOT sent or received
3724 * user data. The special value of '0' indicates that no automatic
3725 * close of any associations should be performed. The option expects an
3726 * integer defining the number of seconds of idle time before an
3727 * association is closed.
3729 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3731 /* Applicable to UDP-style socket only */
3732 if (sctp_style(sk
, TCP
))
3734 if (len
< sizeof(int))
3737 if (put_user(len
, optlen
))
3739 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
3744 /* Helper routine to branch off an association to a new socket. */
3745 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3746 struct socket
**sockp
)
3748 struct sock
*sk
= asoc
->base
.sk
;
3749 struct socket
*sock
;
3750 struct inet_sock
*inetsk
;
3754 /* An association cannot be branched off from an already peeled-off
3755 * socket, nor is this supported for tcp style sockets.
3757 if (!sctp_style(sk
, UDP
))
3760 /* Create a new socket. */
3761 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
3765 /* Populate the fields of the newsk from the oldsk and migrate the
3766 * asoc to the newsk.
3768 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
3770 /* Make peeled-off sockets more like 1-1 accepted sockets.
3771 * Set the daddr and initialize id to something more random
3773 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
3774 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
3775 inetsk
= inet_sk(sock
->sk
);
3776 inetsk
->id
= asoc
->next_tsn
^ jiffies
;
3783 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3785 sctp_peeloff_arg_t peeloff
;
3786 struct socket
*newsock
;
3788 struct sctp_association
*asoc
;
3790 if (len
< sizeof(sctp_peeloff_arg_t
))
3792 len
= sizeof(sctp_peeloff_arg_t
);
3793 if (copy_from_user(&peeloff
, optval
, len
))
3796 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
3802 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __FUNCTION__
, sk
, asoc
);
3804 retval
= sctp_do_peeloff(asoc
, &newsock
);
3808 /* Map the socket to an unused fd that can be returned to the user. */
3809 retval
= sock_map_fd(newsock
);
3811 sock_release(newsock
);
3815 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3816 __FUNCTION__
, sk
, asoc
, newsock
->sk
, retval
);
3818 /* Return the fd mapped to the new socket. */
3819 peeloff
.sd
= retval
;
3820 if (put_user(len
, optlen
))
3822 if (copy_to_user(optval
, &peeloff
, len
))
3829 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3831 * Applications can enable or disable heartbeats for any peer address of
3832 * an association, modify an address's heartbeat interval, force a
3833 * heartbeat to be sent immediately, and adjust the address's maximum
3834 * number of retransmissions sent before an address is considered
3835 * unreachable. The following structure is used to access and modify an
3836 * address's parameters:
3838 * struct sctp_paddrparams {
3839 * sctp_assoc_t spp_assoc_id;
3840 * struct sockaddr_storage spp_address;
3841 * uint32_t spp_hbinterval;
3842 * uint16_t spp_pathmaxrxt;
3843 * uint32_t spp_pathmtu;
3844 * uint32_t spp_sackdelay;
3845 * uint32_t spp_flags;
3848 * spp_assoc_id - (one-to-many style socket) This is filled in the
3849 * application, and identifies the association for
3851 * spp_address - This specifies which address is of interest.
3852 * spp_hbinterval - This contains the value of the heartbeat interval,
3853 * in milliseconds. If a value of zero
3854 * is present in this field then no changes are to
3855 * be made to this parameter.
3856 * spp_pathmaxrxt - This contains the maximum number of
3857 * retransmissions before this address shall be
3858 * considered unreachable. If a value of zero
3859 * is present in this field then no changes are to
3860 * be made to this parameter.
3861 * spp_pathmtu - When Path MTU discovery is disabled the value
3862 * specified here will be the "fixed" path mtu.
3863 * Note that if the spp_address field is empty
3864 * then all associations on this address will
3865 * have this fixed path mtu set upon them.
3867 * spp_sackdelay - When delayed sack is enabled, this value specifies
3868 * the number of milliseconds that sacks will be delayed
3869 * for. This value will apply to all addresses of an
3870 * association if the spp_address field is empty. Note
3871 * also, that if delayed sack is enabled and this
3872 * value is set to 0, no change is made to the last
3873 * recorded delayed sack timer value.
3875 * spp_flags - These flags are used to control various features
3876 * on an association. The flag field may contain
3877 * zero or more of the following options.
3879 * SPP_HB_ENABLE - Enable heartbeats on the
3880 * specified address. Note that if the address
3881 * field is empty all addresses for the association
3882 * have heartbeats enabled upon them.
3884 * SPP_HB_DISABLE - Disable heartbeats on the
3885 * speicifed address. Note that if the address
3886 * field is empty all addresses for the association
3887 * will have their heartbeats disabled. Note also
3888 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
3889 * mutually exclusive, only one of these two should
3890 * be specified. Enabling both fields will have
3891 * undetermined results.
3893 * SPP_HB_DEMAND - Request a user initiated heartbeat
3894 * to be made immediately.
3896 * SPP_PMTUD_ENABLE - This field will enable PMTU
3897 * discovery upon the specified address. Note that
3898 * if the address feild is empty then all addresses
3899 * on the association are effected.
3901 * SPP_PMTUD_DISABLE - This field will disable PMTU
3902 * discovery upon the specified address. Note that
3903 * if the address feild is empty then all addresses
3904 * on the association are effected. Not also that
3905 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
3906 * exclusive. Enabling both will have undetermined
3909 * SPP_SACKDELAY_ENABLE - Setting this flag turns
3910 * on delayed sack. The time specified in spp_sackdelay
3911 * is used to specify the sack delay for this address. Note
3912 * that if spp_address is empty then all addresses will
3913 * enable delayed sack and take on the sack delay
3914 * value specified in spp_sackdelay.
3915 * SPP_SACKDELAY_DISABLE - Setting this flag turns
3916 * off delayed sack. If the spp_address field is blank then
3917 * delayed sack is disabled for the entire association. Note
3918 * also that this field is mutually exclusive to
3919 * SPP_SACKDELAY_ENABLE, setting both will have undefined
3922 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
3923 char __user
*optval
, int __user
*optlen
)
3925 struct sctp_paddrparams params
;
3926 struct sctp_transport
*trans
= NULL
;
3927 struct sctp_association
*asoc
= NULL
;
3928 struct sctp_sock
*sp
= sctp_sk(sk
);
3930 if (len
< sizeof(struct sctp_paddrparams
))
3932 len
= sizeof(struct sctp_paddrparams
);
3933 if (copy_from_user(¶ms
, optval
, len
))
3936 /* If an address other than INADDR_ANY is specified, and
3937 * no transport is found, then the request is invalid.
3939 if (!sctp_is_any(( union sctp_addr
*)¶ms
.spp_address
)) {
3940 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
3941 params
.spp_assoc_id
);
3943 SCTP_DEBUG_PRINTK("Failed no transport\n");
3948 /* Get association, if assoc_id != 0 and the socket is a one
3949 * to many style socket, and an association was not found, then
3950 * the id was invalid.
3952 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
3953 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
3954 SCTP_DEBUG_PRINTK("Failed no association\n");
3959 /* Fetch transport values. */
3960 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
3961 params
.spp_pathmtu
= trans
->pathmtu
;
3962 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
3963 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
3965 /*draft-11 doesn't say what to return in spp_flags*/
3966 params
.spp_flags
= trans
->param_flags
;
3968 /* Fetch association values. */
3969 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
3970 params
.spp_pathmtu
= asoc
->pathmtu
;
3971 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
3972 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
3974 /*draft-11 doesn't say what to return in spp_flags*/
3975 params
.spp_flags
= asoc
->param_flags
;
3977 /* Fetch socket values. */
3978 params
.spp_hbinterval
= sp
->hbinterval
;
3979 params
.spp_pathmtu
= sp
->pathmtu
;
3980 params
.spp_sackdelay
= sp
->sackdelay
;
3981 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
3983 /*draft-11 doesn't say what to return in spp_flags*/
3984 params
.spp_flags
= sp
->param_flags
;
3987 if (copy_to_user(optval
, ¶ms
, len
))
3990 if (put_user(len
, optlen
))
3996 /* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
3998 * This options will get or set the delayed ack timer. The time is set
3999 * in milliseconds. If the assoc_id is 0, then this sets or gets the
4000 * endpoints default delayed ack timer value. If the assoc_id field is
4001 * non-zero, then the set or get effects the specified association.
4003 * struct sctp_assoc_value {
4004 * sctp_assoc_t assoc_id;
4005 * uint32_t assoc_value;
4008 * assoc_id - This parameter, indicates which association the
4009 * user is preforming an action upon. Note that if
4010 * this field's value is zero then the endpoints
4011 * default value is changed (effecting future
4012 * associations only).
4014 * assoc_value - This parameter contains the number of milliseconds
4015 * that the user is requesting the delayed ACK timer
4016 * be set to. Note that this value is defined in
4017 * the standard to be between 200 and 500 milliseconds.
4019 * Note: a value of zero will leave the value alone,
4020 * but disable SACK delay. A non-zero value will also
4021 * enable SACK delay.
4023 static int sctp_getsockopt_delayed_ack_time(struct sock
*sk
, int len
,
4024 char __user
*optval
,
4027 struct sctp_assoc_value params
;
4028 struct sctp_association
*asoc
= NULL
;
4029 struct sctp_sock
*sp
= sctp_sk(sk
);
4031 if (len
< sizeof(struct sctp_assoc_value
))
4034 len
= sizeof(struct sctp_assoc_value
);
4036 if (copy_from_user(¶ms
, optval
, len
))
4039 /* Get association, if assoc_id != 0 and the socket is a one
4040 * to many style socket, and an association was not found, then
4041 * the id was invalid.
4043 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4044 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
4048 /* Fetch association values. */
4049 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
)
4050 params
.assoc_value
= jiffies_to_msecs(
4053 params
.assoc_value
= 0;
4055 /* Fetch socket values. */
4056 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
)
4057 params
.assoc_value
= sp
->sackdelay
;
4059 params
.assoc_value
= 0;
4062 if (copy_to_user(optval
, ¶ms
, len
))
4065 if (put_user(len
, optlen
))
4071 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4073 * Applications can specify protocol parameters for the default association
4074 * initialization. The option name argument to setsockopt() and getsockopt()
4077 * Setting initialization parameters is effective only on an unconnected
4078 * socket (for UDP-style sockets only future associations are effected
4079 * by the change). With TCP-style sockets, this option is inherited by
4080 * sockets derived from a listener socket.
4082 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4084 if (len
< sizeof(struct sctp_initmsg
))
4086 len
= sizeof(struct sctp_initmsg
);
4087 if (put_user(len
, optlen
))
4089 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
4094 static int sctp_getsockopt_peer_addrs_num_old(struct sock
*sk
, int len
,
4095 char __user
*optval
,
4099 struct sctp_association
*asoc
;
4100 struct list_head
*pos
;
4103 if (len
< sizeof(sctp_assoc_t
))
4106 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
4109 /* For UDP-style sockets, id specifies the association to query. */
4110 asoc
= sctp_id2assoc(sk
, id
);
4114 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4122 * Old API for getting list of peer addresses. Does not work for 32-bit
4123 * programs running on a 64-bit kernel
4125 static int sctp_getsockopt_peer_addrs_old(struct sock
*sk
, int len
,
4126 char __user
*optval
,
4129 struct sctp_association
*asoc
;
4130 struct list_head
*pos
;
4132 struct sctp_getaddrs_old getaddrs
;
4133 struct sctp_transport
*from
;
4135 union sctp_addr temp
;
4136 struct sctp_sock
*sp
= sctp_sk(sk
);
4139 if (len
< sizeof(struct sctp_getaddrs_old
))
4142 len
= sizeof(struct sctp_getaddrs_old
);
4144 if (copy_from_user(&getaddrs
, optval
, len
))
4147 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
4149 /* For UDP-style sockets, id specifies the association to query. */
4150 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4154 to
= (void __user
*)getaddrs
.addrs
;
4155 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4156 from
= list_entry(pos
, struct sctp_transport
, transports
);
4157 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4158 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4159 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
4160 if (copy_to_user(to
, &temp
, addrlen
))
4164 if (cnt
>= getaddrs
.addr_num
) break;
4166 getaddrs
.addr_num
= cnt
;
4167 if (put_user(len
, optlen
))
4169 if (copy_to_user(optval
, &getaddrs
, len
))
4175 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4176 char __user
*optval
, int __user
*optlen
)
4178 struct sctp_association
*asoc
;
4179 struct list_head
*pos
;
4181 struct sctp_getaddrs getaddrs
;
4182 struct sctp_transport
*from
;
4184 union sctp_addr temp
;
4185 struct sctp_sock
*sp
= sctp_sk(sk
);
4190 if (len
< sizeof(struct sctp_getaddrs
))
4193 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4196 /* For UDP-style sockets, id specifies the association to query. */
4197 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4201 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4202 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4204 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4205 from
= list_entry(pos
, struct sctp_transport
, transports
);
4206 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4207 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4208 addrlen
= sctp_get_af_specific(sk
->sk_family
)->sockaddr_len
;
4209 if (space_left
< addrlen
)
4211 if (copy_to_user(to
, &temp
, addrlen
))
4215 space_left
-= addrlen
;
4218 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4220 bytes_copied
= ((char __user
*)to
) - optval
;
4221 if (put_user(bytes_copied
, optlen
))
4227 static int sctp_getsockopt_local_addrs_num_old(struct sock
*sk
, int len
,
4228 char __user
*optval
,
4232 struct sctp_bind_addr
*bp
;
4233 struct sctp_association
*asoc
;
4234 struct sctp_sockaddr_entry
*addr
;
4237 if (len
< sizeof(sctp_assoc_t
))
4240 if (copy_from_user(&id
, optval
, sizeof(sctp_assoc_t
)))
4244 * For UDP-style sockets, id specifies the association to query.
4245 * If the id field is set to the value '0' then the locally bound
4246 * addresses are returned without regard to any particular
4250 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4252 asoc
= sctp_id2assoc(sk
, id
);
4255 bp
= &asoc
->base
.bind_addr
;
4258 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
4259 * addresses from the global local address list.
4261 if (sctp_list_single_entry(&bp
->address_list
)) {
4262 addr
= list_entry(bp
->address_list
.next
,
4263 struct sctp_sockaddr_entry
, list
);
4264 if (sctp_is_any(&addr
->a
)) {
4266 list_for_each_entry_rcu(addr
,
4267 &sctp_local_addr_list
, list
) {
4271 if ((PF_INET
== sk
->sk_family
) &&
4272 (AF_INET6
== addr
->a
.sa
.sa_family
))
4284 /* Protection on the bound address list is not needed,
4285 * since in the socket option context we hold the socket lock,
4286 * so there is no way that the bound address list can change.
4288 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4295 /* Helper function that copies local addresses to user and returns the number
4296 * of addresses copied.
4298 static int sctp_copy_laddrs_old(struct sock
*sk
, __u16 port
,
4299 int max_addrs
, void *to
,
4302 struct sctp_sockaddr_entry
*addr
;
4303 union sctp_addr temp
;
4308 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
4312 if ((PF_INET
== sk
->sk_family
) &&
4313 (AF_INET6
== addr
->a
.sa
.sa_family
))
4315 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4316 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4318 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4319 memcpy(to
, &temp
, addrlen
);
4322 *bytes_copied
+= addrlen
;
4324 if (cnt
>= max_addrs
) break;
4331 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4332 size_t space_left
, int *bytes_copied
)
4334 struct sctp_sockaddr_entry
*addr
;
4335 union sctp_addr temp
;
4340 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
4344 if ((PF_INET
== sk
->sk_family
) &&
4345 (AF_INET6
== addr
->a
.sa
.sa_family
))
4347 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4348 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4350 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4351 if (space_left
< addrlen
) {
4355 memcpy(to
, &temp
, addrlen
);
4359 space_left
-= addrlen
;
4360 *bytes_copied
+= addrlen
;
4367 /* Old API for getting list of local addresses. Does not work for 32-bit
4368 * programs running on a 64-bit kernel
4370 static int sctp_getsockopt_local_addrs_old(struct sock
*sk
, int len
,
4371 char __user
*optval
, int __user
*optlen
)
4373 struct sctp_bind_addr
*bp
;
4374 struct sctp_association
*asoc
;
4376 struct sctp_getaddrs_old getaddrs
;
4377 struct sctp_sockaddr_entry
*addr
;
4379 union sctp_addr temp
;
4380 struct sctp_sock
*sp
= sctp_sk(sk
);
4385 int bytes_copied
= 0;
4387 if (len
< sizeof(struct sctp_getaddrs_old
))
4390 len
= sizeof(struct sctp_getaddrs_old
);
4391 if (copy_from_user(&getaddrs
, optval
, len
))
4394 if (getaddrs
.addr_num
<= 0) return -EINVAL
;
4396 * For UDP-style sockets, id specifies the association to query.
4397 * If the id field is set to the value '0' then the locally bound
4398 * addresses are returned without regard to any particular
4401 if (0 == getaddrs
.assoc_id
) {
4402 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4404 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4407 bp
= &asoc
->base
.bind_addr
;
4410 to
= getaddrs
.addrs
;
4412 /* Allocate space for a local instance of packed array to hold all
4413 * the data. We store addresses here first and then put write them
4414 * to the user in one shot.
4416 addrs
= kmalloc(sizeof(union sctp_addr
) * getaddrs
.addr_num
,
4421 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4422 * addresses from the global local address list.
4424 if (sctp_list_single_entry(&bp
->address_list
)) {
4425 addr
= list_entry(bp
->address_list
.next
,
4426 struct sctp_sockaddr_entry
, list
);
4427 if (sctp_is_any(&addr
->a
)) {
4428 cnt
= sctp_copy_laddrs_old(sk
, bp
->port
,
4430 addrs
, &bytes_copied
);
4436 /* Protection on the bound address list is not needed since
4437 * in the socket option context we hold a socket lock and
4438 * thus the bound address list can't change.
4440 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4441 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4442 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4443 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4444 memcpy(buf
, &temp
, addrlen
);
4446 bytes_copied
+= addrlen
;
4448 if (cnt
>= getaddrs
.addr_num
) break;
4452 /* copy the entire address list into the user provided space */
4453 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4458 /* copy the leading structure back to user */
4459 getaddrs
.addr_num
= cnt
;
4460 if (copy_to_user(optval
, &getaddrs
, len
))
4468 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4469 char __user
*optval
, int __user
*optlen
)
4471 struct sctp_bind_addr
*bp
;
4472 struct sctp_association
*asoc
;
4474 struct sctp_getaddrs getaddrs
;
4475 struct sctp_sockaddr_entry
*addr
;
4477 union sctp_addr temp
;
4478 struct sctp_sock
*sp
= sctp_sk(sk
);
4482 int bytes_copied
= 0;
4486 if (len
< sizeof(struct sctp_getaddrs
))
4489 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4493 * For UDP-style sockets, id specifies the association to query.
4494 * If the id field is set to the value '0' then the locally bound
4495 * addresses are returned without regard to any particular
4498 if (0 == getaddrs
.assoc_id
) {
4499 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4501 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4504 bp
= &asoc
->base
.bind_addr
;
4507 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4508 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4510 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4514 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4515 * addresses from the global local address list.
4517 if (sctp_list_single_entry(&bp
->address_list
)) {
4518 addr
= list_entry(bp
->address_list
.next
,
4519 struct sctp_sockaddr_entry
, list
);
4520 if (sctp_is_any(&addr
->a
)) {
4521 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4522 space_left
, &bytes_copied
);
4532 /* Protection on the bound address list is not needed since
4533 * in the socket option context we hold a socket lock and
4534 * thus the bound address list can't change.
4536 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4537 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4538 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4539 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4540 if (space_left
< addrlen
) {
4541 err
= -ENOMEM
; /*fixme: right error?*/
4544 memcpy(buf
, &temp
, addrlen
);
4546 bytes_copied
+= addrlen
;
4548 space_left
-= addrlen
;
4552 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4556 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4560 if (put_user(bytes_copied
, optlen
))
4567 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4569 * Requests that the local SCTP stack use the enclosed peer address as
4570 * the association primary. The enclosed address must be one of the
4571 * association peer's addresses.
4573 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4574 char __user
*optval
, int __user
*optlen
)
4576 struct sctp_prim prim
;
4577 struct sctp_association
*asoc
;
4578 struct sctp_sock
*sp
= sctp_sk(sk
);
4580 if (len
< sizeof(struct sctp_prim
))
4583 len
= sizeof(struct sctp_prim
);
4585 if (copy_from_user(&prim
, optval
, len
))
4588 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4592 if (!asoc
->peer
.primary_path
)
4595 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4596 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4598 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4599 (union sctp_addr
*)&prim
.ssp_addr
);
4601 if (put_user(len
, optlen
))
4603 if (copy_to_user(optval
, &prim
, len
))
4610 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4612 * Requests that the local endpoint set the specified Adaptation Layer
4613 * Indication parameter for all future INIT and INIT-ACK exchanges.
4615 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4616 char __user
*optval
, int __user
*optlen
)
4618 struct sctp_setadaptation adaptation
;
4620 if (len
< sizeof(struct sctp_setadaptation
))
4623 len
= sizeof(struct sctp_setadaptation
);
4625 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4627 if (put_user(len
, optlen
))
4629 if (copy_to_user(optval
, &adaptation
, len
))
4637 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4639 * Applications that wish to use the sendto() system call may wish to
4640 * specify a default set of parameters that would normally be supplied
4641 * through the inclusion of ancillary data. This socket option allows
4642 * such an application to set the default sctp_sndrcvinfo structure.
4645 * The application that wishes to use this socket option simply passes
4646 * in to this call the sctp_sndrcvinfo structure defined in Section
4647 * 5.2.2) The input parameters accepted by this call include
4648 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4649 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4650 * to this call if the caller is using the UDP model.
4652 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4654 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4655 int len
, char __user
*optval
,
4658 struct sctp_sndrcvinfo info
;
4659 struct sctp_association
*asoc
;
4660 struct sctp_sock
*sp
= sctp_sk(sk
);
4662 if (len
< sizeof(struct sctp_sndrcvinfo
))
4665 len
= sizeof(struct sctp_sndrcvinfo
);
4667 if (copy_from_user(&info
, optval
, len
))
4670 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4671 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4675 info
.sinfo_stream
= asoc
->default_stream
;
4676 info
.sinfo_flags
= asoc
->default_flags
;
4677 info
.sinfo_ppid
= asoc
->default_ppid
;
4678 info
.sinfo_context
= asoc
->default_context
;
4679 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4681 info
.sinfo_stream
= sp
->default_stream
;
4682 info
.sinfo_flags
= sp
->default_flags
;
4683 info
.sinfo_ppid
= sp
->default_ppid
;
4684 info
.sinfo_context
= sp
->default_context
;
4685 info
.sinfo_timetolive
= sp
->default_timetolive
;
4688 if (put_user(len
, optlen
))
4690 if (copy_to_user(optval
, &info
, len
))
4698 * 7.1.5 SCTP_NODELAY
4700 * Turn on/off any Nagle-like algorithm. This means that packets are
4701 * generally sent as soon as possible and no unnecessary delays are
4702 * introduced, at the cost of more packets in the network. Expects an
4703 * integer boolean flag.
4706 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4707 char __user
*optval
, int __user
*optlen
)
4711 if (len
< sizeof(int))
4715 val
= (sctp_sk(sk
)->nodelay
== 1);
4716 if (put_user(len
, optlen
))
4718 if (copy_to_user(optval
, &val
, len
))
4725 * 7.1.1 SCTP_RTOINFO
4727 * The protocol parameters used to initialize and bound retransmission
4728 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4729 * and modify these parameters.
4730 * All parameters are time values, in milliseconds. A value of 0, when
4731 * modifying the parameters, indicates that the current value should not
4735 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4736 char __user
*optval
,
4737 int __user
*optlen
) {
4738 struct sctp_rtoinfo rtoinfo
;
4739 struct sctp_association
*asoc
;
4741 if (len
< sizeof (struct sctp_rtoinfo
))
4744 len
= sizeof(struct sctp_rtoinfo
);
4746 if (copy_from_user(&rtoinfo
, optval
, len
))
4749 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4751 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4754 /* Values corresponding to the specific association. */
4756 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4757 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4758 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4760 /* Values corresponding to the endpoint. */
4761 struct sctp_sock
*sp
= sctp_sk(sk
);
4763 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4764 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4765 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4768 if (put_user(len
, optlen
))
4771 if (copy_to_user(optval
, &rtoinfo
, len
))
4779 * 7.1.2 SCTP_ASSOCINFO
4781 * This option is used to tune the maximum retransmission attempts
4782 * of the association.
4783 * Returns an error if the new association retransmission value is
4784 * greater than the sum of the retransmission value of the peer.
4785 * See [SCTP] for more information.
4788 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4789 char __user
*optval
,
4793 struct sctp_assocparams assocparams
;
4794 struct sctp_association
*asoc
;
4795 struct list_head
*pos
;
4798 if (len
< sizeof (struct sctp_assocparams
))
4801 len
= sizeof(struct sctp_assocparams
);
4803 if (copy_from_user(&assocparams
, optval
, len
))
4806 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4808 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4811 /* Values correspoinding to the specific association */
4813 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4814 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4815 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4816 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4818 (asoc
->cookie_life
.tv_usec
4821 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4825 assocparams
.sasoc_number_peer_destinations
= cnt
;
4827 /* Values corresponding to the endpoint */
4828 struct sctp_sock
*sp
= sctp_sk(sk
);
4830 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4831 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4832 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4833 assocparams
.sasoc_cookie_life
=
4834 sp
->assocparams
.sasoc_cookie_life
;
4835 assocparams
.sasoc_number_peer_destinations
=
4837 sasoc_number_peer_destinations
;
4840 if (put_user(len
, optlen
))
4843 if (copy_to_user(optval
, &assocparams
, len
))
4850 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4852 * This socket option is a boolean flag which turns on or off mapped V4
4853 * addresses. If this option is turned on and the socket is type
4854 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4855 * If this option is turned off, then no mapping will be done of V4
4856 * addresses and a user will receive both PF_INET6 and PF_INET type
4857 * addresses on the socket.
4859 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
4860 char __user
*optval
, int __user
*optlen
)
4863 struct sctp_sock
*sp
= sctp_sk(sk
);
4865 if (len
< sizeof(int))
4870 if (put_user(len
, optlen
))
4872 if (copy_to_user(optval
, &val
, len
))
4879 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
4880 * (chapter and verse is quoted at sctp_setsockopt_context())
4882 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
4883 char __user
*optval
, int __user
*optlen
)
4885 struct sctp_assoc_value params
;
4886 struct sctp_sock
*sp
;
4887 struct sctp_association
*asoc
;
4889 if (len
< sizeof(struct sctp_assoc_value
))
4892 len
= sizeof(struct sctp_assoc_value
);
4894 if (copy_from_user(¶ms
, optval
, len
))
4899 if (params
.assoc_id
!= 0) {
4900 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4903 params
.assoc_value
= asoc
->default_rcv_context
;
4905 params
.assoc_value
= sp
->default_rcv_context
;
4908 if (put_user(len
, optlen
))
4910 if (copy_to_user(optval
, ¶ms
, len
))
4917 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
4919 * This socket option specifies the maximum size to put in any outgoing
4920 * SCTP chunk. If a message is larger than this size it will be
4921 * fragmented by SCTP into the specified size. Note that the underlying
4922 * SCTP implementation may fragment into smaller sized chunks when the
4923 * PMTU of the underlying association is smaller than the value set by
4926 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
4927 char __user
*optval
, int __user
*optlen
)
4931 if (len
< sizeof(int))
4936 val
= sctp_sk(sk
)->user_frag
;
4937 if (put_user(len
, optlen
))
4939 if (copy_to_user(optval
, &val
, len
))
4946 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
4947 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
4949 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
4950 char __user
*optval
, int __user
*optlen
)
4954 if (len
< sizeof(int))
4959 val
= sctp_sk(sk
)->frag_interleave
;
4960 if (put_user(len
, optlen
))
4962 if (copy_to_user(optval
, &val
, len
))
4969 * 7.1.25. Set or Get the sctp partial delivery point
4970 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
4972 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
4973 char __user
*optval
,
4978 if (len
< sizeof(u32
))
4983 val
= sctp_sk(sk
)->pd_point
;
4984 if (put_user(len
, optlen
))
4986 if (copy_to_user(optval
, &val
, len
))
4993 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
4994 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
4996 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
4997 char __user
*optval
,
5002 if (len
< sizeof(int))
5007 val
= sctp_sk(sk
)->max_burst
;
5008 if (put_user(len
, optlen
))
5010 if (copy_to_user(optval
, &val
, len
))
5016 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5017 char __user
*optval
, int __user
*optlen
)
5019 struct sctp_hmac_algo_param
*hmacs
;
5022 hmacs
= sctp_sk(sk
)->ep
->auth_hmacs_list
;
5023 param_len
= ntohs(hmacs
->param_hdr
.length
);
5025 if (len
< param_len
)
5027 if (put_user(len
, optlen
))
5029 if (copy_to_user(optval
, hmacs
->hmac_ids
, len
))
5035 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5036 char __user
*optval
, int __user
*optlen
)
5038 struct sctp_authkeyid val
;
5039 struct sctp_association
*asoc
;
5041 if (len
< sizeof(struct sctp_authkeyid
))
5043 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5046 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5047 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5051 val
.scact_keynumber
= asoc
->active_key_id
;
5053 val
.scact_keynumber
= sctp_sk(sk
)->ep
->active_key_id
;
5058 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5059 char __user
*optval
, int __user
*optlen
)
5061 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5062 struct sctp_authchunks val
;
5063 struct sctp_association
*asoc
;
5064 struct sctp_chunks_param
*ch
;
5067 if (len
<= sizeof(struct sctp_authchunks
))
5070 if (copy_from_user(&val
, p
, sizeof(struct sctp_authchunks
)))
5073 to
= p
->gauth_chunks
;
5074 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5078 ch
= asoc
->peer
.peer_chunks
;
5080 /* See if the user provided enough room for all the data */
5081 if (len
< ntohs(ch
->param_hdr
.length
))
5084 len
= ntohs(ch
->param_hdr
.length
);
5085 if (put_user(len
, optlen
))
5087 if (copy_to_user(to
, ch
->chunks
, len
))
5093 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
5094 char __user
*optval
, int __user
*optlen
)
5096 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5097 struct sctp_authchunks val
;
5098 struct sctp_association
*asoc
;
5099 struct sctp_chunks_param
*ch
;
5102 if (len
<= sizeof(struct sctp_authchunks
))
5105 if (copy_from_user(&val
, p
, sizeof(struct sctp_authchunks
)))
5108 to
= p
->gauth_chunks
;
5109 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5110 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
5114 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
5116 ch
= sctp_sk(sk
)->ep
->auth_chunk_list
;
5118 if (len
< ntohs(ch
->param_hdr
.length
))
5121 len
= ntohs(ch
->param_hdr
.length
);
5122 if (put_user(len
, optlen
))
5124 if (copy_to_user(to
, ch
->chunks
, len
))
5130 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
5131 char __user
*optval
, int __user
*optlen
)
5136 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5139 /* I can hardly begin to describe how wrong this is. This is
5140 * so broken as to be worse than useless. The API draft
5141 * REALLY is NOT helpful here... I am not convinced that the
5142 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5143 * are at all well-founded.
5145 if (level
!= SOL_SCTP
) {
5146 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5148 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
5152 if (get_user(len
, optlen
))
5159 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
5161 case SCTP_DISABLE_FRAGMENTS
:
5162 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
5166 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
5168 case SCTP_AUTOCLOSE
:
5169 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
5171 case SCTP_SOCKOPT_PEELOFF
:
5172 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
5174 case SCTP_PEER_ADDR_PARAMS
:
5175 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
5178 case SCTP_DELAYED_ACK_TIME
:
5179 retval
= sctp_getsockopt_delayed_ack_time(sk
, len
, optval
,
5183 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
5185 case SCTP_GET_PEER_ADDRS_NUM_OLD
:
5186 retval
= sctp_getsockopt_peer_addrs_num_old(sk
, len
, optval
,
5189 case SCTP_GET_LOCAL_ADDRS_NUM_OLD
:
5190 retval
= sctp_getsockopt_local_addrs_num_old(sk
, len
, optval
,
5193 case SCTP_GET_PEER_ADDRS_OLD
:
5194 retval
= sctp_getsockopt_peer_addrs_old(sk
, len
, optval
,
5197 case SCTP_GET_LOCAL_ADDRS_OLD
:
5198 retval
= sctp_getsockopt_local_addrs_old(sk
, len
, optval
,
5201 case SCTP_GET_PEER_ADDRS
:
5202 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
5205 case SCTP_GET_LOCAL_ADDRS
:
5206 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
5209 case SCTP_DEFAULT_SEND_PARAM
:
5210 retval
= sctp_getsockopt_default_send_param(sk
, len
,
5213 case SCTP_PRIMARY_ADDR
:
5214 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
5217 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
5220 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
5222 case SCTP_ASSOCINFO
:
5223 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
5225 case SCTP_I_WANT_MAPPED_V4_ADDR
:
5226 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
5229 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
5231 case SCTP_GET_PEER_ADDR_INFO
:
5232 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
5235 case SCTP_ADAPTATION_LAYER
:
5236 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
5240 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
5242 case SCTP_FRAGMENT_INTERLEAVE
:
5243 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
5246 case SCTP_PARTIAL_DELIVERY_POINT
:
5247 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
5250 case SCTP_MAX_BURST
:
5251 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
5254 case SCTP_AUTH_CHUNK
:
5255 case SCTP_AUTH_DELETE_KEY
:
5256 retval
= -EOPNOTSUPP
;
5258 case SCTP_HMAC_IDENT
:
5259 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
5261 case SCTP_AUTH_ACTIVE_KEY
:
5262 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
5264 case SCTP_PEER_AUTH_CHUNKS
:
5265 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
5268 case SCTP_LOCAL_AUTH_CHUNKS
:
5269 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
5273 retval
= -ENOPROTOOPT
;
5277 sctp_release_sock(sk
);
5281 static void sctp_hash(struct sock
*sk
)
5286 static void sctp_unhash(struct sock
*sk
)
5291 /* Check if port is acceptable. Possibly find first available port.
5293 * The port hash table (contained in the 'global' SCTP protocol storage
5294 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5295 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5296 * list (the list number is the port number hashed out, so as you
5297 * would expect from a hash function, all the ports in a given list have
5298 * such a number that hashes out to the same list number; you were
5299 * expecting that, right?); so each list has a set of ports, with a
5300 * link to the socket (struct sock) that uses it, the port number and
5301 * a fastreuse flag (FIXME: NPI ipg).
5303 static struct sctp_bind_bucket
*sctp_bucket_create(
5304 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
5306 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
5308 struct sctp_bind_hashbucket
*head
; /* hash list */
5309 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5310 struct hlist_node
*node
;
5311 unsigned short snum
;
5314 snum
= ntohs(addr
->v4
.sin_port
);
5316 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
5317 sctp_local_bh_disable();
5320 /* Search for an available port. */
5321 int low
, high
, remaining
, index
;
5324 inet_get_local_port_range(&low
, &high
);
5325 remaining
= (high
- low
) + 1;
5326 rover
= net_random() % remaining
+ low
;
5330 if ((rover
< low
) || (rover
> high
))
5332 index
= sctp_phashfn(rover
);
5333 head
= &sctp_port_hashtable
[index
];
5334 sctp_spin_lock(&head
->lock
);
5335 sctp_for_each_hentry(pp
, node
, &head
->chain
)
5336 if (pp
->port
== rover
)
5340 sctp_spin_unlock(&head
->lock
);
5341 } while (--remaining
> 0);
5343 /* Exhausted local port range during search? */
5348 /* OK, here is the one we will use. HEAD (the port
5349 * hash table list entry) is non-NULL and we hold it's
5354 /* We are given an specific port number; we verify
5355 * that it is not being used. If it is used, we will
5356 * exahust the search in the hash list corresponding
5357 * to the port number (snum) - we detect that with the
5358 * port iterator, pp being NULL.
5360 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
5361 sctp_spin_lock(&head
->lock
);
5362 sctp_for_each_hentry(pp
, node
, &head
->chain
) {
5363 if (pp
->port
== snum
)
5370 if (!hlist_empty(&pp
->owner
)) {
5371 /* We had a port hash table hit - there is an
5372 * available port (pp != NULL) and it is being
5373 * used by other socket (pp->owner not empty); that other
5374 * socket is going to be sk2.
5376 int reuse
= sk
->sk_reuse
;
5378 struct hlist_node
*node
;
5380 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5381 if (pp
->fastreuse
&& sk
->sk_reuse
&&
5382 sk
->sk_state
!= SCTP_SS_LISTENING
)
5385 /* Run through the list of sockets bound to the port
5386 * (pp->port) [via the pointers bind_next and
5387 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5388 * we get the endpoint they describe and run through
5389 * the endpoint's list of IP (v4 or v6) addresses,
5390 * comparing each of the addresses with the address of
5391 * the socket sk. If we find a match, then that means
5392 * that this port/socket (sk) combination are already
5395 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
5396 struct sctp_endpoint
*ep2
;
5397 ep2
= sctp_sk(sk2
)->ep
;
5399 if (reuse
&& sk2
->sk_reuse
&&
5400 sk2
->sk_state
!= SCTP_SS_LISTENING
)
5403 if (sctp_bind_addr_match(&ep2
->base
.bind_addr
, addr
,
5409 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5412 /* If there was a hash table miss, create a new port. */
5414 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
5417 /* In either case (hit or miss), make sure fastreuse is 1 only
5418 * if sk->sk_reuse is too (that is, if the caller requested
5419 * SO_REUSEADDR on this socket -sk-).
5421 if (hlist_empty(&pp
->owner
)) {
5422 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
5426 } else if (pp
->fastreuse
&&
5427 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
5430 /* We are set, so fill up all the data in the hash table
5431 * entry, tie the socket list information with the rest of the
5432 * sockets FIXME: Blurry, NPI (ipg).
5435 if (!sctp_sk(sk
)->bind_hash
) {
5436 inet_sk(sk
)->num
= snum
;
5437 sk_add_bind_node(sk
, &pp
->owner
);
5438 sctp_sk(sk
)->bind_hash
= pp
;
5443 sctp_spin_unlock(&head
->lock
);
5446 sctp_local_bh_enable();
5450 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5451 * port is requested.
5453 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
5456 union sctp_addr addr
;
5457 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5459 /* Set up a dummy address struct from the sk. */
5460 af
->from_sk(&addr
, sk
);
5461 addr
.v4
.sin_port
= htons(snum
);
5463 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5464 ret
= sctp_get_port_local(sk
, &addr
);
5466 return (ret
? 1 : 0);
5470 * 3.1.3 listen() - UDP Style Syntax
5472 * By default, new associations are not accepted for UDP style sockets.
5473 * An application uses listen() to mark a socket as being able to
5474 * accept new associations.
5476 SCTP_STATIC
int sctp_seqpacket_listen(struct sock
*sk
, int backlog
)
5478 struct sctp_sock
*sp
= sctp_sk(sk
);
5479 struct sctp_endpoint
*ep
= sp
->ep
;
5481 /* Only UDP style sockets that are not peeled off are allowed to
5484 if (!sctp_style(sk
, UDP
))
5487 /* If backlog is zero, disable listening. */
5489 if (sctp_sstate(sk
, CLOSED
))
5492 sctp_unhash_endpoint(ep
);
5493 sk
->sk_state
= SCTP_SS_CLOSED
;
5497 /* Return if we are already listening. */
5498 if (sctp_sstate(sk
, LISTENING
))
5502 * If a bind() or sctp_bindx() is not called prior to a listen()
5503 * call that allows new associations to be accepted, the system
5504 * picks an ephemeral port and will choose an address set equivalent
5505 * to binding with a wildcard address.
5507 * This is not currently spelled out in the SCTP sockets
5508 * extensions draft, but follows the practice as seen in TCP
5511 * Additionally, turn off fastreuse flag since we are not listening
5513 sk
->sk_state
= SCTP_SS_LISTENING
;
5514 if (!ep
->base
.bind_addr
.port
) {
5515 if (sctp_autobind(sk
))
5518 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5520 sctp_hash_endpoint(ep
);
5525 * 4.1.3 listen() - TCP Style Syntax
5527 * Applications uses listen() to ready the SCTP endpoint for accepting
5528 * inbound associations.
5530 SCTP_STATIC
int sctp_stream_listen(struct sock
*sk
, int backlog
)
5532 struct sctp_sock
*sp
= sctp_sk(sk
);
5533 struct sctp_endpoint
*ep
= sp
->ep
;
5535 /* If backlog is zero, disable listening. */
5537 if (sctp_sstate(sk
, CLOSED
))
5540 sctp_unhash_endpoint(ep
);
5541 sk
->sk_state
= SCTP_SS_CLOSED
;
5545 if (sctp_sstate(sk
, LISTENING
))
5549 * If a bind() or sctp_bindx() is not called prior to a listen()
5550 * call that allows new associations to be accepted, the system
5551 * picks an ephemeral port and will choose an address set equivalent
5552 * to binding with a wildcard address.
5554 * This is not currently spelled out in the SCTP sockets
5555 * extensions draft, but follows the practice as seen in TCP
5558 sk
->sk_state
= SCTP_SS_LISTENING
;
5559 if (!ep
->base
.bind_addr
.port
) {
5560 if (sctp_autobind(sk
))
5563 sctp_sk(sk
)->bind_hash
->fastreuse
= 0;
5565 sk
->sk_max_ack_backlog
= backlog
;
5566 sctp_hash_endpoint(ep
);
5571 * Move a socket to LISTENING state.
5573 int sctp_inet_listen(struct socket
*sock
, int backlog
)
5575 struct sock
*sk
= sock
->sk
;
5576 struct crypto_hash
*tfm
= NULL
;
5579 if (unlikely(backlog
< 0))
5584 if (sock
->state
!= SS_UNCONNECTED
)
5587 /* Allocate HMAC for generating cookie. */
5588 if (sctp_hmac_alg
) {
5589 tfm
= crypto_alloc_hash(sctp_hmac_alg
, 0, CRYPTO_ALG_ASYNC
);
5591 if (net_ratelimit()) {
5593 "SCTP: failed to load transform for %s: %ld\n",
5594 sctp_hmac_alg
, PTR_ERR(tfm
));
5601 switch (sock
->type
) {
5602 case SOCK_SEQPACKET
:
5603 err
= sctp_seqpacket_listen(sk
, backlog
);
5606 err
= sctp_stream_listen(sk
, backlog
);
5615 /* Store away the transform reference. */
5616 sctp_sk(sk
)->hmac
= tfm
;
5618 sctp_release_sock(sk
);
5621 crypto_free_hash(tfm
);
5626 * This function is done by modeling the current datagram_poll() and the
5627 * tcp_poll(). Note that, based on these implementations, we don't
5628 * lock the socket in this function, even though it seems that,
5629 * ideally, locking or some other mechanisms can be used to ensure
5630 * the integrity of the counters (sndbuf and wmem_alloc) used
5631 * in this place. We assume that we don't need locks either until proven
5634 * Another thing to note is that we include the Async I/O support
5635 * here, again, by modeling the current TCP/UDP code. We don't have
5636 * a good way to test with it yet.
5638 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
5640 struct sock
*sk
= sock
->sk
;
5641 struct sctp_sock
*sp
= sctp_sk(sk
);
5644 poll_wait(file
, sk
->sk_sleep
, wait
);
5646 /* A TCP-style listening socket becomes readable when the accept queue
5649 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
5650 return (!list_empty(&sp
->ep
->asocs
)) ?
5651 (POLLIN
| POLLRDNORM
) : 0;
5655 /* Is there any exceptional events? */
5656 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
5658 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5660 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
5663 /* Is it readable? Reconsider this code with TCP-style support. */
5664 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
5665 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
5666 mask
|= POLLIN
| POLLRDNORM
;
5668 /* The association is either gone or not ready. */
5669 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
5672 /* Is it writable? */
5673 if (sctp_writeable(sk
)) {
5674 mask
|= POLLOUT
| POLLWRNORM
;
5676 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
5678 * Since the socket is not locked, the buffer
5679 * might be made available after the writeable check and
5680 * before the bit is set. This could cause a lost I/O
5681 * signal. tcp_poll() has a race breaker for this race
5682 * condition. Based on their implementation, we put
5683 * in the following code to cover it as well.
5685 if (sctp_writeable(sk
))
5686 mask
|= POLLOUT
| POLLWRNORM
;
5691 /********************************************************************
5692 * 2nd Level Abstractions
5693 ********************************************************************/
5695 static struct sctp_bind_bucket
*sctp_bucket_create(
5696 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
5698 struct sctp_bind_bucket
*pp
;
5700 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
5701 SCTP_DBG_OBJCNT_INC(bind_bucket
);
5705 INIT_HLIST_HEAD(&pp
->owner
);
5706 hlist_add_head(&pp
->node
, &head
->chain
);
5711 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5712 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
5714 if (pp
&& hlist_empty(&pp
->owner
)) {
5715 __hlist_del(&pp
->node
);
5716 kmem_cache_free(sctp_bucket_cachep
, pp
);
5717 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
5721 /* Release this socket's reference to a local port. */
5722 static inline void __sctp_put_port(struct sock
*sk
)
5724 struct sctp_bind_hashbucket
*head
=
5725 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->num
)];
5726 struct sctp_bind_bucket
*pp
;
5728 sctp_spin_lock(&head
->lock
);
5729 pp
= sctp_sk(sk
)->bind_hash
;
5730 __sk_del_bind_node(sk
);
5731 sctp_sk(sk
)->bind_hash
= NULL
;
5732 inet_sk(sk
)->num
= 0;
5733 sctp_bucket_destroy(pp
);
5734 sctp_spin_unlock(&head
->lock
);
5737 void sctp_put_port(struct sock
*sk
)
5739 sctp_local_bh_disable();
5740 __sctp_put_port(sk
);
5741 sctp_local_bh_enable();
5745 * The system picks an ephemeral port and choose an address set equivalent
5746 * to binding with a wildcard address.
5747 * One of those addresses will be the primary address for the association.
5748 * This automatically enables the multihoming capability of SCTP.
5750 static int sctp_autobind(struct sock
*sk
)
5752 union sctp_addr autoaddr
;
5756 /* Initialize a local sockaddr structure to INADDR_ANY. */
5757 af
= sctp_sk(sk
)->pf
->af
;
5759 port
= htons(inet_sk(sk
)->num
);
5760 af
->inaddr_any(&autoaddr
, port
);
5762 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5765 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5768 * 4.2 The cmsghdr Structure *
5770 * When ancillary data is sent or received, any number of ancillary data
5771 * objects can be specified by the msg_control and msg_controllen members of
5772 * the msghdr structure, because each object is preceded by
5773 * a cmsghdr structure defining the object's length (the cmsg_len member).
5774 * Historically Berkeley-derived implementations have passed only one object
5775 * at a time, but this API allows multiple objects to be
5776 * passed in a single call to sendmsg() or recvmsg(). The following example
5777 * shows two ancillary data objects in a control buffer.
5779 * |<--------------------------- msg_controllen -------------------------->|
5782 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5784 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5787 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5789 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5792 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5793 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5795 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5797 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5804 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
5805 sctp_cmsgs_t
*cmsgs
)
5807 struct cmsghdr
*cmsg
;
5809 for (cmsg
= CMSG_FIRSTHDR(msg
);
5811 cmsg
= CMSG_NXTHDR((struct msghdr
*)msg
, cmsg
)) {
5812 if (!CMSG_OK(msg
, cmsg
))
5815 /* Should we parse this header or ignore? */
5816 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
5819 /* Strictly check lengths following example in SCM code. */
5820 switch (cmsg
->cmsg_type
) {
5822 /* SCTP Socket API Extension
5823 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5825 * This cmsghdr structure provides information for
5826 * initializing new SCTP associations with sendmsg().
5827 * The SCTP_INITMSG socket option uses this same data
5828 * structure. This structure is not used for
5831 * cmsg_level cmsg_type cmsg_data[]
5832 * ------------ ------------ ----------------------
5833 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5835 if (cmsg
->cmsg_len
!=
5836 CMSG_LEN(sizeof(struct sctp_initmsg
)))
5838 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
5842 /* SCTP Socket API Extension
5843 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5845 * This cmsghdr structure specifies SCTP options for
5846 * sendmsg() and describes SCTP header information
5847 * about a received message through recvmsg().
5849 * cmsg_level cmsg_type cmsg_data[]
5850 * ------------ ------------ ----------------------
5851 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5853 if (cmsg
->cmsg_len
!=
5854 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
5858 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
5860 /* Minimally, validate the sinfo_flags. */
5861 if (cmsgs
->info
->sinfo_flags
&
5862 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
5863 SCTP_ABORT
| SCTP_EOF
))
5875 * Wait for a packet..
5876 * Note: This function is the same function as in core/datagram.c
5877 * with a few modifications to make lksctp work.
5879 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
5884 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
5886 /* Socket errors? */
5887 error
= sock_error(sk
);
5891 if (!skb_queue_empty(&sk
->sk_receive_queue
))
5894 /* Socket shut down? */
5895 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5898 /* Sequenced packets can come disconnected. If so we report the
5903 /* Is there a good reason to think that we may receive some data? */
5904 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
5907 /* Handle signals. */
5908 if (signal_pending(current
))
5911 /* Let another process have a go. Since we are going to sleep
5912 * anyway. Note: This may cause odd behaviors if the message
5913 * does not fit in the user's buffer, but this seems to be the
5914 * only way to honor MSG_DONTWAIT realistically.
5916 sctp_release_sock(sk
);
5917 *timeo_p
= schedule_timeout(*timeo_p
);
5921 finish_wait(sk
->sk_sleep
, &wait
);
5925 error
= sock_intr_errno(*timeo_p
);
5928 finish_wait(sk
->sk_sleep
, &wait
);
5933 /* Receive a datagram.
5934 * Note: This is pretty much the same routine as in core/datagram.c
5935 * with a few changes to make lksctp work.
5937 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
5938 int noblock
, int *err
)
5941 struct sk_buff
*skb
;
5944 timeo
= sock_rcvtimeo(sk
, noblock
);
5946 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
5947 timeo
, MAX_SCHEDULE_TIMEOUT
);
5950 /* Again only user level code calls this function,
5951 * so nothing interrupt level
5952 * will suddenly eat the receive_queue.
5954 * Look at current nfs client by the way...
5955 * However, this function was corrent in any case. 8)
5957 if (flags
& MSG_PEEK
) {
5958 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
5959 skb
= skb_peek(&sk
->sk_receive_queue
);
5961 atomic_inc(&skb
->users
);
5962 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
5964 skb
= skb_dequeue(&sk
->sk_receive_queue
);
5970 /* Caller is allowed not to check sk->sk_err before calling. */
5971 error
= sock_error(sk
);
5975 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5978 /* User doesn't want to wait. */
5982 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
5991 /* If sndbuf has changed, wake up per association sndbuf waiters. */
5992 static void __sctp_write_space(struct sctp_association
*asoc
)
5994 struct sock
*sk
= asoc
->base
.sk
;
5995 struct socket
*sock
= sk
->sk_socket
;
5997 if ((sctp_wspace(asoc
) > 0) && sock
) {
5998 if (waitqueue_active(&asoc
->wait
))
5999 wake_up_interruptible(&asoc
->wait
);
6001 if (sctp_writeable(sk
)) {
6002 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
6003 wake_up_interruptible(sk
->sk_sleep
);
6005 /* Note that we try to include the Async I/O support
6006 * here by modeling from the current TCP/UDP code.
6007 * We have not tested with it yet.
6009 if (sock
->fasync_list
&&
6010 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
6011 sock_wake_async(sock
, 2, POLL_OUT
);
6016 /* Do accounting for the sndbuf space.
6017 * Decrement the used sndbuf space of the corresponding association by the
6018 * data size which was just transmitted(freed).
6020 static void sctp_wfree(struct sk_buff
*skb
)
6022 struct sctp_association
*asoc
;
6023 struct sctp_chunk
*chunk
;
6026 /* Get the saved chunk pointer. */
6027 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
6030 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
6031 sizeof(struct sk_buff
) +
6032 sizeof(struct sctp_chunk
);
6034 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
6037 * This undoes what is done via sk_charge_skb
6039 sk
->sk_wmem_queued
-= skb
->truesize
;
6040 sk
->sk_forward_alloc
+= skb
->truesize
;
6043 __sctp_write_space(asoc
);
6045 sctp_association_put(asoc
);
6048 /* Do accounting for the receive space on the socket.
6049 * Accounting for the association is done in ulpevent.c
6050 * We set this as a destructor for the cloned data skbs so that
6051 * accounting is done at the correct time.
6053 void sctp_sock_rfree(struct sk_buff
*skb
)
6055 struct sock
*sk
= skb
->sk
;
6056 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
6058 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
6061 * Mimic the behavior of sk_stream_rfree
6063 sk
->sk_forward_alloc
+= event
->rmem_len
;
6067 /* Helper function to wait for space in the sndbuf. */
6068 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
6071 struct sock
*sk
= asoc
->base
.sk
;
6073 long current_timeo
= *timeo_p
;
6076 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6077 asoc
, (long)(*timeo_p
), msg_len
);
6079 /* Increment the association's refcnt. */
6080 sctp_association_hold(asoc
);
6082 /* Wait on the association specific sndbuf space. */
6084 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6085 TASK_INTERRUPTIBLE
);
6088 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6091 if (signal_pending(current
))
6092 goto do_interrupted
;
6093 if (msg_len
<= sctp_wspace(asoc
))
6096 /* Let another process have a go. Since we are going
6099 sctp_release_sock(sk
);
6100 current_timeo
= schedule_timeout(current_timeo
);
6101 BUG_ON(sk
!= asoc
->base
.sk
);
6104 *timeo_p
= current_timeo
;
6108 finish_wait(&asoc
->wait
, &wait
);
6110 /* Release the association's refcnt. */
6111 sctp_association_put(asoc
);
6120 err
= sock_intr_errno(*timeo_p
);
6128 /* If socket sndbuf has changed, wake up all per association waiters. */
6129 void sctp_write_space(struct sock
*sk
)
6131 struct sctp_association
*asoc
;
6132 struct list_head
*pos
;
6134 /* Wake up the tasks in each wait queue. */
6135 list_for_each(pos
, &((sctp_sk(sk
))->ep
->asocs
)) {
6136 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
6137 __sctp_write_space(asoc
);
6141 /* Is there any sndbuf space available on the socket?
6143 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6144 * associations on the same socket. For a UDP-style socket with
6145 * multiple associations, it is possible for it to be "unwriteable"
6146 * prematurely. I assume that this is acceptable because
6147 * a premature "unwriteable" is better than an accidental "writeable" which
6148 * would cause an unwanted block under certain circumstances. For the 1-1
6149 * UDP-style sockets or TCP-style sockets, this code should work.
6152 static int sctp_writeable(struct sock
*sk
)
6156 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
6162 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6163 * returns immediately with EINPROGRESS.
6165 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
6167 struct sock
*sk
= asoc
->base
.sk
;
6169 long current_timeo
= *timeo_p
;
6172 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __FUNCTION__
, asoc
,
6175 /* Increment the association's refcnt. */
6176 sctp_association_hold(asoc
);
6179 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6180 TASK_INTERRUPTIBLE
);
6183 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6185 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6188 if (signal_pending(current
))
6189 goto do_interrupted
;
6191 if (sctp_state(asoc
, ESTABLISHED
))
6194 /* Let another process have a go. Since we are going
6197 sctp_release_sock(sk
);
6198 current_timeo
= schedule_timeout(current_timeo
);
6201 *timeo_p
= current_timeo
;
6205 finish_wait(&asoc
->wait
, &wait
);
6207 /* Release the association's refcnt. */
6208 sctp_association_put(asoc
);
6213 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
6216 err
= -ECONNREFUSED
;
6220 err
= sock_intr_errno(*timeo_p
);
6228 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
6230 struct sctp_endpoint
*ep
;
6234 ep
= sctp_sk(sk
)->ep
;
6238 prepare_to_wait_exclusive(sk
->sk_sleep
, &wait
,
6239 TASK_INTERRUPTIBLE
);
6241 if (list_empty(&ep
->asocs
)) {
6242 sctp_release_sock(sk
);
6243 timeo
= schedule_timeout(timeo
);
6248 if (!sctp_sstate(sk
, LISTENING
))
6252 if (!list_empty(&ep
->asocs
))
6255 err
= sock_intr_errno(timeo
);
6256 if (signal_pending(current
))
6264 finish_wait(sk
->sk_sleep
, &wait
);
6269 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
6274 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
6275 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
6277 sctp_release_sock(sk
);
6278 timeout
= schedule_timeout(timeout
);
6280 } while (!signal_pending(current
) && timeout
);
6282 finish_wait(sk
->sk_sleep
, &wait
);
6285 static void sctp_sock_rfree_frag(struct sk_buff
*skb
)
6287 struct sk_buff
*frag
;
6292 /* Don't forget the fragments. */
6293 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
6294 sctp_sock_rfree_frag(frag
);
6297 sctp_sock_rfree(skb
);
6300 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
6302 struct sk_buff
*frag
;
6307 /* Don't forget the fragments. */
6308 for (frag
= skb_shinfo(skb
)->frag_list
; frag
; frag
= frag
->next
)
6309 sctp_skb_set_owner_r_frag(frag
, sk
);
6312 sctp_skb_set_owner_r(skb
, sk
);
6315 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6316 * and its messages to the newsk.
6318 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
6319 struct sctp_association
*assoc
,
6320 sctp_socket_type_t type
)
6322 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
6323 struct sctp_sock
*newsp
= sctp_sk(newsk
);
6324 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
6325 struct sctp_endpoint
*newep
= newsp
->ep
;
6326 struct sk_buff
*skb
, *tmp
;
6327 struct sctp_ulpevent
*event
;
6330 /* Migrate socket buffer sizes and all the socket level options to the
6333 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
6334 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
6335 /* Brute force copy old sctp opt. */
6336 inet_sk_copy_descendant(newsk
, oldsk
);
6338 /* Restore the ep value that was overwritten with the above structure
6344 /* Hook this new socket in to the bind_hash list. */
6345 pp
= sctp_sk(oldsk
)->bind_hash
;
6346 sk_add_bind_node(newsk
, &pp
->owner
);
6347 sctp_sk(newsk
)->bind_hash
= pp
;
6348 inet_sk(newsk
)->num
= inet_sk(oldsk
)->num
;
6350 /* Copy the bind_addr list from the original endpoint to the new
6351 * endpoint so that we can handle restarts properly
6353 if (PF_INET6
== assoc
->base
.sk
->sk_family
)
6354 flags
= SCTP_ADDR6_ALLOWED
;
6355 if (assoc
->peer
.ipv4_address
)
6356 flags
|= SCTP_ADDR4_PEERSUPP
;
6357 if (assoc
->peer
.ipv6_address
)
6358 flags
|= SCTP_ADDR6_PEERSUPP
;
6359 sctp_bind_addr_copy(&newsp
->ep
->base
.bind_addr
,
6360 &oldsp
->ep
->base
.bind_addr
,
6361 SCTP_SCOPE_GLOBAL
, GFP_KERNEL
, flags
);
6363 /* Move any messages in the old socket's receive queue that are for the
6364 * peeled off association to the new socket's receive queue.
6366 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
6367 event
= sctp_skb2event(skb
);
6368 if (event
->asoc
== assoc
) {
6369 sctp_sock_rfree_frag(skb
);
6370 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
6371 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
6372 sctp_skb_set_owner_r_frag(skb
, newsk
);
6376 /* Clean up any messages pending delivery due to partial
6377 * delivery. Three cases:
6378 * 1) No partial deliver; no work.
6379 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6380 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6382 skb_queue_head_init(&newsp
->pd_lobby
);
6383 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
6385 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
6386 struct sk_buff_head
*queue
;
6388 /* Decide which queue to move pd_lobby skbs to. */
6389 if (assoc
->ulpq
.pd_mode
) {
6390 queue
= &newsp
->pd_lobby
;
6392 queue
= &newsk
->sk_receive_queue
;
6394 /* Walk through the pd_lobby, looking for skbs that
6395 * need moved to the new socket.
6397 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6398 event
= sctp_skb2event(skb
);
6399 if (event
->asoc
== assoc
) {
6400 sctp_sock_rfree_frag(skb
);
6401 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6402 __skb_queue_tail(queue
, skb
);
6403 sctp_skb_set_owner_r_frag(skb
, newsk
);
6407 /* Clear up any skbs waiting for the partial
6408 * delivery to finish.
6410 if (assoc
->ulpq
.pd_mode
)
6411 sctp_clear_pd(oldsk
, NULL
);
6415 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
) {
6416 sctp_sock_rfree_frag(skb
);
6417 sctp_skb_set_owner_r_frag(skb
, newsk
);
6420 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
) {
6421 sctp_sock_rfree_frag(skb
);
6422 sctp_skb_set_owner_r_frag(skb
, newsk
);
6425 /* Set the type of socket to indicate that it is peeled off from the
6426 * original UDP-style socket or created with the accept() call on a
6427 * TCP-style socket..
6431 /* Mark the new socket "in-use" by the user so that any packets
6432 * that may arrive on the association after we've moved it are
6433 * queued to the backlog. This prevents a potential race between
6434 * backlog processing on the old socket and new-packet processing
6435 * on the new socket.
6437 * The caller has just allocated newsk so we can guarantee that other
6438 * paths won't try to lock it and then oldsk.
6440 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
6441 sctp_assoc_migrate(assoc
, newsk
);
6443 /* If the association on the newsk is already closed before accept()
6444 * is called, set RCV_SHUTDOWN flag.
6446 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
6447 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
6449 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
6450 sctp_release_sock(newsk
);
6454 DEFINE_PROTO_INUSE(sctp
)
6456 /* This proto struct describes the ULP interface for SCTP. */
6457 struct proto sctp_prot
= {
6459 .owner
= THIS_MODULE
,
6460 .close
= sctp_close
,
6461 .connect
= sctp_connect
,
6462 .disconnect
= sctp_disconnect
,
6463 .accept
= sctp_accept
,
6464 .ioctl
= sctp_ioctl
,
6465 .init
= sctp_init_sock
,
6466 .destroy
= sctp_destroy_sock
,
6467 .shutdown
= sctp_shutdown
,
6468 .setsockopt
= sctp_setsockopt
,
6469 .getsockopt
= sctp_getsockopt
,
6470 .sendmsg
= sctp_sendmsg
,
6471 .recvmsg
= sctp_recvmsg
,
6473 .backlog_rcv
= sctp_backlog_rcv
,
6475 .unhash
= sctp_unhash
,
6476 .get_port
= sctp_get_port
,
6477 .obj_size
= sizeof(struct sctp_sock
),
6478 .sysctl_mem
= sysctl_sctp_mem
,
6479 .sysctl_rmem
= sysctl_sctp_rmem
,
6480 .sysctl_wmem
= sysctl_sctp_wmem
,
6481 .memory_pressure
= &sctp_memory_pressure
,
6482 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6483 .memory_allocated
= &sctp_memory_allocated
,
6484 REF_PROTO_INUSE(sctp
)
6487 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6488 DEFINE_PROTO_INUSE(sctpv6
)
6490 struct proto sctpv6_prot
= {
6492 .owner
= THIS_MODULE
,
6493 .close
= sctp_close
,
6494 .connect
= sctp_connect
,
6495 .disconnect
= sctp_disconnect
,
6496 .accept
= sctp_accept
,
6497 .ioctl
= sctp_ioctl
,
6498 .init
= sctp_init_sock
,
6499 .destroy
= sctp_destroy_sock
,
6500 .shutdown
= sctp_shutdown
,
6501 .setsockopt
= sctp_setsockopt
,
6502 .getsockopt
= sctp_getsockopt
,
6503 .sendmsg
= sctp_sendmsg
,
6504 .recvmsg
= sctp_recvmsg
,
6506 .backlog_rcv
= sctp_backlog_rcv
,
6508 .unhash
= sctp_unhash
,
6509 .get_port
= sctp_get_port
,
6510 .obj_size
= sizeof(struct sctp6_sock
),
6511 .sysctl_mem
= sysctl_sctp_mem
,
6512 .sysctl_rmem
= sysctl_sctp_rmem
,
6513 .sysctl_wmem
= sysctl_sctp_wmem
,
6514 .memory_pressure
= &sctp_memory_pressure
,
6515 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6516 .memory_allocated
= &sctp_memory_allocated
,
6517 REF_PROTO_INUSE(sctpv6
)
6519 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */