1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
18 * This SCTP implementation is free software;
19 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
24 * This SCTP implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, write to
32 * the Free Software Foundation, 59 Temple Place - Suite 330,
33 * Boston, MA 02111-1307, USA.
35 * Please send any bug reports or fixes you make to the
37 * lksctp developers <lksctp-developers@lists.sourceforge.net>
39 * Or submit a bug report through the following website:
40 * http://www.sf.net/projects/lksctp
42 * Written or modified by:
43 * La Monte H.P. Yarroll <piggy@acm.org>
44 * Narasimha Budihal <narsi@refcode.org>
45 * Karl Knutson <karl@athena.chicago.il.us>
46 * Jon Grimm <jgrimm@us.ibm.com>
47 * Xingang Guo <xingang.guo@intel.com>
48 * Daisy Chang <daisyc@us.ibm.com>
49 * Sridhar Samudrala <samudrala@us.ibm.com>
50 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
51 * Ardelle Fan <ardelle.fan@intel.com>
52 * Ryan Layer <rmlayer@us.ibm.com>
53 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
54 * Kevin Gao <kevin.gao@intel.com>
56 * Any bugs reported given to us we will try to fix... any fixes shared will
57 * be incorporated into the next SCTP release.
60 #include <linux/types.h>
61 #include <linux/kernel.h>
62 #include <linux/wait.h>
63 #include <linux/time.h>
65 #include <linux/capability.h>
66 #include <linux/fcntl.h>
67 #include <linux/poll.h>
68 #include <linux/init.h>
69 #include <linux/crypto.h>
70 #include <linux/slab.h>
74 #include <net/route.h>
76 #include <net/inet_common.h>
78 #include <linux/socket.h> /* for sa_family_t */
80 #include <net/sctp/sctp.h>
81 #include <net/sctp/sm.h>
83 /* WARNING: Please do not remove the SCTP_STATIC attribute to
84 * any of the functions below as they are used to export functions
85 * used by a project regression testsuite.
88 /* Forward declarations for internal helper functions. */
89 static int sctp_writeable(struct sock
*sk
);
90 static void sctp_wfree(struct sk_buff
*skb
);
91 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
93 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
);
94 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
95 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
96 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
97 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
98 union sctp_addr
*addr
, int len
);
99 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
100 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
101 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
102 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
103 static int sctp_send_asconf(struct sctp_association
*asoc
,
104 struct sctp_chunk
*chunk
);
105 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
106 static int sctp_autobind(struct sock
*sk
);
107 static void sctp_sock_migrate(struct sock
*, struct sock
*,
108 struct sctp_association
*, sctp_socket_type_t
);
109 static char *sctp_hmac_alg
= SCTP_COOKIE_HMAC_ALG
;
111 extern struct kmem_cache
*sctp_bucket_cachep
;
112 extern int sysctl_sctp_mem
[3];
113 extern int sysctl_sctp_rmem
[3];
114 extern int sysctl_sctp_wmem
[3];
116 static int sctp_memory_pressure
;
117 static atomic_t sctp_memory_allocated
;
118 struct percpu_counter sctp_sockets_allocated
;
120 static void sctp_enter_memory_pressure(struct sock
*sk
)
122 sctp_memory_pressure
= 1;
126 /* Get the sndbuf space available at the time on the association. */
127 static inline int sctp_wspace(struct sctp_association
*asoc
)
131 if (asoc
->ep
->sndbuf_policy
)
132 amt
= asoc
->sndbuf_used
;
134 amt
= sk_wmem_alloc_get(asoc
->base
.sk
);
136 if (amt
>= asoc
->base
.sk
->sk_sndbuf
) {
137 if (asoc
->base
.sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)
140 amt
= sk_stream_wspace(asoc
->base
.sk
);
145 amt
= asoc
->base
.sk
->sk_sndbuf
- amt
;
150 /* Increment the used sndbuf space count of the corresponding association by
151 * the size of the outgoing data chunk.
152 * Also, set the skb destructor for sndbuf accounting later.
154 * Since it is always 1-1 between chunk and skb, and also a new skb is always
155 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
156 * destructor in the data chunk skb for the purpose of the sndbuf space
159 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
161 struct sctp_association
*asoc
= chunk
->asoc
;
162 struct sock
*sk
= asoc
->base
.sk
;
164 /* The sndbuf space is tracked per association. */
165 sctp_association_hold(asoc
);
167 skb_set_owner_w(chunk
->skb
, sk
);
169 chunk
->skb
->destructor
= sctp_wfree
;
170 /* Save the chunk pointer in skb for sctp_wfree to use later. */
171 *((struct sctp_chunk
**)(chunk
->skb
->cb
)) = chunk
;
173 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
174 sizeof(struct sk_buff
) +
175 sizeof(struct sctp_chunk
);
177 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
178 sk
->sk_wmem_queued
+= chunk
->skb
->truesize
;
179 sk_mem_charge(sk
, chunk
->skb
->truesize
);
182 /* Verify that this is a valid address. */
183 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
188 /* Verify basic sockaddr. */
189 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
193 /* Is this a valid SCTP address? */
194 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
197 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
203 /* Look up the association by its id. If this is not a UDP-style
204 * socket, the ID field is always ignored.
206 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
208 struct sctp_association
*asoc
= NULL
;
210 /* If this is not a UDP-style socket, assoc id should be ignored. */
211 if (!sctp_style(sk
, UDP
)) {
212 /* Return NULL if the socket state is not ESTABLISHED. It
213 * could be a TCP-style listening socket or a socket which
214 * hasn't yet called connect() to establish an association.
216 if (!sctp_sstate(sk
, ESTABLISHED
))
219 /* Get the first and the only association from the list. */
220 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
221 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
222 struct sctp_association
, asocs
);
226 /* Otherwise this is a UDP-style socket. */
227 if (!id
|| (id
== (sctp_assoc_t
)-1))
230 spin_lock_bh(&sctp_assocs_id_lock
);
231 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
232 spin_unlock_bh(&sctp_assocs_id_lock
);
234 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
240 /* Look up the transport from an address and an assoc id. If both address and
241 * id are specified, the associations matching the address and the id should be
244 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
245 struct sockaddr_storage
*addr
,
248 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
249 struct sctp_transport
*transport
;
250 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
252 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
259 id_asoc
= sctp_id2assoc(sk
, id
);
260 if (id_asoc
&& (id_asoc
!= addr_asoc
))
263 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
264 (union sctp_addr
*)addr
);
269 /* API 3.1.2 bind() - UDP Style Syntax
270 * The syntax of bind() is,
272 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
274 * sd - the socket descriptor returned by socket().
275 * addr - the address structure (struct sockaddr_in or struct
276 * sockaddr_in6 [RFC 2553]),
277 * addr_len - the size of the address structure.
279 SCTP_STATIC
int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
285 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
288 /* Disallow binding twice. */
289 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
290 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
295 sctp_release_sock(sk
);
300 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
302 /* Verify this is a valid sockaddr. */
303 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
304 union sctp_addr
*addr
, int len
)
308 /* Check minimum size. */
309 if (len
< sizeof (struct sockaddr
))
312 /* V4 mapped address are really of AF_INET family */
313 if (addr
->sa
.sa_family
== AF_INET6
&&
314 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
)) {
315 if (!opt
->pf
->af_supported(AF_INET
, opt
))
318 /* Does this PF support this AF? */
319 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
323 /* If we get this far, af is valid. */
324 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
326 if (len
< af
->sockaddr_len
)
332 /* Bind a local address either to an endpoint or to an association. */
333 SCTP_STATIC
int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
335 struct sctp_sock
*sp
= sctp_sk(sk
);
336 struct sctp_endpoint
*ep
= sp
->ep
;
337 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
342 /* Common sockaddr verification. */
343 af
= sctp_sockaddr_af(sp
, addr
, len
);
345 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
350 snum
= ntohs(addr
->v4
.sin_port
);
352 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
353 ", port: %d, new port: %d, len: %d)\n",
359 /* PF specific bind() address verification. */
360 if (!sp
->pf
->bind_verify(sp
, addr
))
361 return -EADDRNOTAVAIL
;
363 /* We must either be unbound, or bind to the same port.
364 * It's OK to allow 0 ports if we are already bound.
365 * We'll just inhert an already bound port in this case
370 else if (snum
!= bp
->port
) {
371 SCTP_DEBUG_PRINTK("sctp_do_bind:"
372 " New port %d does not match existing port "
373 "%d.\n", snum
, bp
->port
);
378 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
381 /* See if the address matches any of the addresses we may have
382 * already bound before checking against other endpoints.
384 if (sctp_bind_addr_match(bp
, addr
, sp
))
387 /* Make sure we are allowed to bind here.
388 * The function sctp_get_port_local() does duplicate address
391 addr
->v4
.sin_port
= htons(snum
);
392 if ((ret
= sctp_get_port_local(sk
, addr
))) {
396 /* Refresh ephemeral port. */
398 bp
->port
= inet_sk(sk
)->inet_num
;
400 /* Add the address to the bind address list.
401 * Use GFP_ATOMIC since BHs will be disabled.
403 ret
= sctp_add_bind_addr(bp
, addr
, SCTP_ADDR_SRC
, GFP_ATOMIC
);
405 /* Copy back into socket for getsockname() use. */
407 inet_sk(sk
)->inet_sport
= htons(inet_sk(sk
)->inet_num
);
408 af
->to_sk_saddr(addr
, sk
);
414 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
416 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
417 * at any one time. If a sender, after sending an ASCONF chunk, decides
418 * it needs to transfer another ASCONF Chunk, it MUST wait until the
419 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
420 * subsequent ASCONF. Note this restriction binds each side, so at any
421 * time two ASCONF may be in-transit on any given association (one sent
422 * from each endpoint).
424 static int sctp_send_asconf(struct sctp_association
*asoc
,
425 struct sctp_chunk
*chunk
)
429 /* If there is an outstanding ASCONF chunk, queue it for later
432 if (asoc
->addip_last_asconf
) {
433 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
437 /* Hold the chunk until an ASCONF_ACK is received. */
438 sctp_chunk_hold(chunk
);
439 retval
= sctp_primitive_ASCONF(asoc
, chunk
);
441 sctp_chunk_free(chunk
);
443 asoc
->addip_last_asconf
= chunk
;
449 /* Add a list of addresses as bind addresses to local endpoint or
452 * Basically run through each address specified in the addrs/addrcnt
453 * array/length pair, determine if it is IPv6 or IPv4 and call
454 * sctp_do_bind() on it.
456 * If any of them fails, then the operation will be reversed and the
457 * ones that were added will be removed.
459 * Only sctp_setsockopt_bindx() is supposed to call this function.
461 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
466 struct sockaddr
*sa_addr
;
469 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
473 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
474 /* The list may contain either IPv4 or IPv6 address;
475 * determine the address length for walking thru the list.
477 sa_addr
= (struct sockaddr
*)addr_buf
;
478 af
= sctp_get_af_specific(sa_addr
->sa_family
);
484 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
487 addr_buf
+= af
->sockaddr_len
;
491 /* Failed. Cleanup the ones that have been added */
493 sctp_bindx_rem(sk
, addrs
, cnt
);
501 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
502 * associations that are part of the endpoint indicating that a list of local
503 * addresses are added to the endpoint.
505 * If any of the addresses is already in the bind address list of the
506 * association, we do not send the chunk for that association. But it will not
507 * affect other associations.
509 * Only sctp_setsockopt_bindx() is supposed to call this function.
511 static int sctp_send_asconf_add_ip(struct sock
*sk
,
512 struct sockaddr
*addrs
,
515 struct sctp_sock
*sp
;
516 struct sctp_endpoint
*ep
;
517 struct sctp_association
*asoc
;
518 struct sctp_bind_addr
*bp
;
519 struct sctp_chunk
*chunk
;
520 struct sctp_sockaddr_entry
*laddr
;
521 union sctp_addr
*addr
;
522 union sctp_addr saveaddr
;
529 if (!sctp_addip_enable
)
535 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
536 __func__
, sk
, addrs
, addrcnt
);
538 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
540 if (!asoc
->peer
.asconf_capable
)
543 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
546 if (!sctp_state(asoc
, ESTABLISHED
))
549 /* Check if any address in the packed array of addresses is
550 * in the bind address list of the association. If so,
551 * do not send the asconf chunk to its peer, but continue with
552 * other associations.
555 for (i
= 0; i
< addrcnt
; i
++) {
556 addr
= (union sctp_addr
*)addr_buf
;
557 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
563 if (sctp_assoc_lookup_laddr(asoc
, addr
))
566 addr_buf
+= af
->sockaddr_len
;
571 /* Use the first valid address in bind addr list of
572 * association as Address Parameter of ASCONF CHUNK.
574 bp
= &asoc
->base
.bind_addr
;
575 p
= bp
->address_list
.next
;
576 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
577 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
578 addrcnt
, SCTP_PARAM_ADD_IP
);
584 retval
= sctp_send_asconf(asoc
, chunk
);
588 /* Add the new addresses to the bind address list with
589 * use_as_src set to 0.
592 for (i
= 0; i
< addrcnt
; i
++) {
593 addr
= (union sctp_addr
*)addr_buf
;
594 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
595 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
596 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
597 SCTP_ADDR_NEW
, GFP_ATOMIC
);
598 addr_buf
+= af
->sockaddr_len
;
606 /* Remove a list of addresses from bind addresses list. Do not remove the
609 * Basically run through each address specified in the addrs/addrcnt
610 * array/length pair, determine if it is IPv6 or IPv4 and call
611 * sctp_del_bind() on it.
613 * If any of them fails, then the operation will be reversed and the
614 * ones that were removed will be added back.
616 * At least one address has to be left; if only one address is
617 * available, the operation will return -EBUSY.
619 * Only sctp_setsockopt_bindx() is supposed to call this function.
621 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
623 struct sctp_sock
*sp
= sctp_sk(sk
);
624 struct sctp_endpoint
*ep
= sp
->ep
;
626 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
629 union sctp_addr
*sa_addr
;
632 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
636 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
637 /* If the bind address list is empty or if there is only one
638 * bind address, there is nothing more to be removed (we need
639 * at least one address here).
641 if (list_empty(&bp
->address_list
) ||
642 (sctp_list_single_entry(&bp
->address_list
))) {
647 sa_addr
= (union sctp_addr
*)addr_buf
;
648 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
654 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
655 retval
= -EADDRNOTAVAIL
;
659 if (sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
664 /* FIXME - There is probably a need to check if sk->sk_saddr and
665 * sk->sk_rcv_addr are currently set to one of the addresses to
666 * be removed. This is something which needs to be looked into
667 * when we are fixing the outstanding issues with multi-homing
668 * socket routing and failover schemes. Refer to comments in
669 * sctp_do_bind(). -daisy
671 retval
= sctp_del_bind_addr(bp
, sa_addr
);
673 addr_buf
+= af
->sockaddr_len
;
676 /* Failed. Add the ones that has been removed back */
678 sctp_bindx_add(sk
, addrs
, cnt
);
686 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
687 * the associations that are part of the endpoint indicating that a list of
688 * local addresses are removed from the endpoint.
690 * If any of the addresses is already in the bind address list of the
691 * association, we do not send the chunk for that association. But it will not
692 * affect other associations.
694 * Only sctp_setsockopt_bindx() is supposed to call this function.
696 static int sctp_send_asconf_del_ip(struct sock
*sk
,
697 struct sockaddr
*addrs
,
700 struct sctp_sock
*sp
;
701 struct sctp_endpoint
*ep
;
702 struct sctp_association
*asoc
;
703 struct sctp_transport
*transport
;
704 struct sctp_bind_addr
*bp
;
705 struct sctp_chunk
*chunk
;
706 union sctp_addr
*laddr
;
709 struct sctp_sockaddr_entry
*saddr
;
713 if (!sctp_addip_enable
)
719 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
720 __func__
, sk
, addrs
, addrcnt
);
722 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
724 if (!asoc
->peer
.asconf_capable
)
727 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
730 if (!sctp_state(asoc
, ESTABLISHED
))
733 /* Check if any address in the packed array of addresses is
734 * not present in the bind address list of the association.
735 * If so, do not send the asconf chunk to its peer, but
736 * continue with other associations.
739 for (i
= 0; i
< addrcnt
; i
++) {
740 laddr
= (union sctp_addr
*)addr_buf
;
741 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
747 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
750 addr_buf
+= af
->sockaddr_len
;
755 /* Find one address in the association's bind address list
756 * that is not in the packed array of addresses. This is to
757 * make sure that we do not delete all the addresses in the
760 bp
= &asoc
->base
.bind_addr
;
761 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
766 /* We do not need RCU protection throughout this loop
767 * because this is done under a socket lock from the
770 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
777 /* Reset use_as_src flag for the addresses in the bind address
778 * list that are to be deleted.
781 for (i
= 0; i
< addrcnt
; i
++) {
782 laddr
= (union sctp_addr
*)addr_buf
;
783 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
784 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
785 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
786 saddr
->state
= SCTP_ADDR_DEL
;
788 addr_buf
+= af
->sockaddr_len
;
791 /* Update the route and saddr entries for all the transports
792 * as some of the addresses in the bind address list are
793 * about to be deleted and cannot be used as source addresses.
795 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
797 dst_release(transport
->dst
);
798 sctp_transport_route(transport
, NULL
,
799 sctp_sk(asoc
->base
.sk
));
802 retval
= sctp_send_asconf(asoc
, chunk
);
808 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
811 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
814 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
815 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
818 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
819 * Section 3.1.2 for this usage.
821 * addrs is a pointer to an array of one or more socket addresses. Each
822 * address is contained in its appropriate structure (i.e. struct
823 * sockaddr_in or struct sockaddr_in6) the family of the address type
824 * must be used to distinguish the address length (note that this
825 * representation is termed a "packed array" of addresses). The caller
826 * specifies the number of addresses in the array with addrcnt.
828 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
829 * -1, and sets errno to the appropriate error code.
831 * For SCTP, the port given in each socket address must be the same, or
832 * sctp_bindx() will fail, setting errno to EINVAL.
834 * The flags parameter is formed from the bitwise OR of zero or more of
835 * the following currently defined flags:
837 * SCTP_BINDX_ADD_ADDR
839 * SCTP_BINDX_REM_ADDR
841 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
842 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
843 * addresses from the association. The two flags are mutually exclusive;
844 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
845 * not remove all addresses from an association; sctp_bindx() will
846 * reject such an attempt with EINVAL.
848 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
849 * additional addresses with an endpoint after calling bind(). Or use
850 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
851 * socket is associated with so that no new association accepted will be
852 * associated with those addresses. If the endpoint supports dynamic
853 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
854 * endpoint to send the appropriate message to the peer to change the
855 * peers address lists.
857 * Adding and removing addresses from a connected association is
858 * optional functionality. Implementations that do not support this
859 * functionality should return EOPNOTSUPP.
861 * Basically do nothing but copying the addresses from user to kernel
862 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
863 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
866 * We don't use copy_from_user() for optimization: we first do the
867 * sanity checks (buffer size -fast- and access check-healthy
868 * pointer); if all of those succeed, then we can alloc the memory
869 * (expensive operation) needed to copy the data to kernel. Then we do
870 * the copying without checking the user space area
871 * (__copy_from_user()).
873 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
876 * sk The sk of the socket
877 * addrs The pointer to the addresses in user land
878 * addrssize Size of the addrs buffer
879 * op Operation to perform (add or remove, see the flags of
882 * Returns 0 if ok, <0 errno code on error.
884 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
885 struct sockaddr __user
*addrs
,
886 int addrs_size
, int op
)
888 struct sockaddr
*kaddrs
;
892 struct sockaddr
*sa_addr
;
896 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
897 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
899 if (unlikely(addrs_size
<= 0))
902 /* Check the user passed a healthy pointer. */
903 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
906 /* Alloc space for the address array in kernel memory. */
907 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
908 if (unlikely(!kaddrs
))
911 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
916 /* Walk through the addrs buffer and count the number of addresses. */
918 while (walk_size
< addrs_size
) {
919 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
924 sa_addr
= (struct sockaddr
*)addr_buf
;
925 af
= sctp_get_af_specific(sa_addr
->sa_family
);
927 /* If the address family is not supported or if this address
928 * causes the address buffer to overflow return EINVAL.
930 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
935 addr_buf
+= af
->sockaddr_len
;
936 walk_size
+= af
->sockaddr_len
;
941 case SCTP_BINDX_ADD_ADDR
:
942 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
945 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
948 case SCTP_BINDX_REM_ADDR
:
949 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
952 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
966 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
968 * Common routine for handling connect() and sctp_connectx().
969 * Connect will come in with just a single address.
971 static int __sctp_connect(struct sock
* sk
,
972 struct sockaddr
*kaddrs
,
974 sctp_assoc_t
*assoc_id
)
976 struct sctp_sock
*sp
;
977 struct sctp_endpoint
*ep
;
978 struct sctp_association
*asoc
= NULL
;
979 struct sctp_association
*asoc2
;
980 struct sctp_transport
*transport
;
988 union sctp_addr
*sa_addr
= NULL
;
991 unsigned int f_flags
= 0;
996 /* connect() cannot be done on a socket that is already in ESTABLISHED
997 * state - UDP-style peeled off socket or a TCP-style socket that
998 * is already connected.
999 * It cannot be done even on a TCP-style listening socket.
1001 if (sctp_sstate(sk
, ESTABLISHED
) ||
1002 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
1007 /* Walk through the addrs buffer and count the number of addresses. */
1009 while (walk_size
< addrs_size
) {
1010 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1015 sa_addr
= (union sctp_addr
*)addr_buf
;
1016 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1018 /* If the address family is not supported or if this address
1019 * causes the address buffer to overflow return EINVAL.
1021 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1026 port
= ntohs(sa_addr
->v4
.sin_port
);
1028 /* Save current address so we can work with it */
1029 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1031 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1035 /* Make sure the destination port is correctly set
1038 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
)
1042 /* Check if there already is a matching association on the
1043 * endpoint (other than the one created here).
1045 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1046 if (asoc2
&& asoc2
!= asoc
) {
1047 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1054 /* If we could not find a matching association on the endpoint,
1055 * make sure that there is no peeled-off association matching
1056 * the peer address even on another socket.
1058 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1059 err
= -EADDRNOTAVAIL
;
1064 /* If a bind() or sctp_bindx() is not called prior to
1065 * an sctp_connectx() call, the system picks an
1066 * ephemeral port and will choose an address set
1067 * equivalent to binding with a wildcard address.
1069 if (!ep
->base
.bind_addr
.port
) {
1070 if (sctp_autobind(sk
)) {
1076 * If an unprivileged user inherits a 1-many
1077 * style socket with open associations on a
1078 * privileged port, it MAY be permitted to
1079 * accept new associations, but it SHOULD NOT
1080 * be permitted to open new associations.
1082 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1083 !capable(CAP_NET_BIND_SERVICE
)) {
1089 scope
= sctp_scope(&to
);
1090 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1096 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
,
1104 /* Prime the peer's transport structures. */
1105 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1113 addr_buf
+= af
->sockaddr_len
;
1114 walk_size
+= af
->sockaddr_len
;
1117 /* In case the user of sctp_connectx() wants an association
1118 * id back, assign one now.
1121 err
= sctp_assoc_set_id(asoc
, GFP_KERNEL
);
1126 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1131 /* Initialize sk's dport and daddr for getpeername() */
1132 inet_sk(sk
)->inet_dport
= htons(asoc
->peer
.port
);
1133 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1134 af
->to_sk_daddr(sa_addr
, sk
);
1137 /* in-kernel sockets don't generally have a file allocated to them
1138 * if all they do is call sock_create_kern().
1140 if (sk
->sk_socket
->file
)
1141 f_flags
= sk
->sk_socket
->file
->f_flags
;
1143 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1145 err
= sctp_wait_for_connect(asoc
, &timeo
);
1146 if ((err
== 0 || err
== -EINPROGRESS
) && assoc_id
)
1147 *assoc_id
= asoc
->assoc_id
;
1149 /* Don't free association on exit. */
1154 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1155 " kaddrs: %p err: %d\n",
1158 sctp_association_free(asoc
);
1162 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1165 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1166 * sctp_assoc_t *asoc);
1168 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1169 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1170 * or IPv6 addresses.
1172 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1173 * Section 3.1.2 for this usage.
1175 * addrs is a pointer to an array of one or more socket addresses. Each
1176 * address is contained in its appropriate structure (i.e. struct
1177 * sockaddr_in or struct sockaddr_in6) the family of the address type
1178 * must be used to distengish the address length (note that this
1179 * representation is termed a "packed array" of addresses). The caller
1180 * specifies the number of addresses in the array with addrcnt.
1182 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1183 * the association id of the new association. On failure, sctp_connectx()
1184 * returns -1, and sets errno to the appropriate error code. The assoc_id
1185 * is not touched by the kernel.
1187 * For SCTP, the port given in each socket address must be the same, or
1188 * sctp_connectx() will fail, setting errno to EINVAL.
1190 * An application can use sctp_connectx to initiate an association with
1191 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1192 * allows a caller to specify multiple addresses at which a peer can be
1193 * reached. The way the SCTP stack uses the list of addresses to set up
1194 * the association is implementation dependant. This function only
1195 * specifies that the stack will try to make use of all the addresses in
1196 * the list when needed.
1198 * Note that the list of addresses passed in is only used for setting up
1199 * the association. It does not necessarily equal the set of addresses
1200 * the peer uses for the resulting association. If the caller wants to
1201 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1202 * retrieve them after the association has been set up.
1204 * Basically do nothing but copying the addresses from user to kernel
1205 * land and invoking either sctp_connectx(). This is used for tunneling
1206 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1208 * We don't use copy_from_user() for optimization: we first do the
1209 * sanity checks (buffer size -fast- and access check-healthy
1210 * pointer); if all of those succeed, then we can alloc the memory
1211 * (expensive operation) needed to copy the data to kernel. Then we do
1212 * the copying without checking the user space area
1213 * (__copy_from_user()).
1215 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1218 * sk The sk of the socket
1219 * addrs The pointer to the addresses in user land
1220 * addrssize Size of the addrs buffer
1222 * Returns >=0 if ok, <0 errno code on error.
1224 SCTP_STATIC
int __sctp_setsockopt_connectx(struct sock
* sk
,
1225 struct sockaddr __user
*addrs
,
1227 sctp_assoc_t
*assoc_id
)
1230 struct sockaddr
*kaddrs
;
1232 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1233 __func__
, sk
, addrs
, addrs_size
);
1235 if (unlikely(addrs_size
<= 0))
1238 /* Check the user passed a healthy pointer. */
1239 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1242 /* Alloc space for the address array in kernel memory. */
1243 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1244 if (unlikely(!kaddrs
))
1247 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1250 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, assoc_id
);
1259 * This is an older interface. It's kept for backward compatibility
1260 * to the option that doesn't provide association id.
1262 SCTP_STATIC
int sctp_setsockopt_connectx_old(struct sock
* sk
,
1263 struct sockaddr __user
*addrs
,
1266 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1270 * New interface for the API. The since the API is done with a socket
1271 * option, to make it simple we feed back the association id is as a return
1272 * indication to the call. Error is always negative and association id is
1275 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1276 struct sockaddr __user
*addrs
,
1279 sctp_assoc_t assoc_id
= 0;
1282 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1291 * New (hopefully final) interface for the API.
1292 * We use the sctp_getaddrs_old structure so that use-space library
1293 * can avoid any unnecessary allocations. The only defferent part
1294 * is that we store the actual length of the address buffer into the
1295 * addrs_num structure member. That way we can re-use the existing
1298 SCTP_STATIC
int sctp_getsockopt_connectx3(struct sock
* sk
, int len
,
1299 char __user
*optval
,
1302 struct sctp_getaddrs_old param
;
1303 sctp_assoc_t assoc_id
= 0;
1306 if (len
< sizeof(param
))
1309 if (copy_from_user(¶m
, optval
, sizeof(param
)))
1312 err
= __sctp_setsockopt_connectx(sk
,
1313 (struct sockaddr __user
*)param
.addrs
,
1314 param
.addr_num
, &assoc_id
);
1316 if (err
== 0 || err
== -EINPROGRESS
) {
1317 if (copy_to_user(optval
, &assoc_id
, sizeof(assoc_id
)))
1319 if (put_user(sizeof(assoc_id
), optlen
))
1326 /* API 3.1.4 close() - UDP Style Syntax
1327 * Applications use close() to perform graceful shutdown (as described in
1328 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1329 * by a UDP-style socket.
1333 * ret = close(int sd);
1335 * sd - the socket descriptor of the associations to be closed.
1337 * To gracefully shutdown a specific association represented by the
1338 * UDP-style socket, an application should use the sendmsg() call,
1339 * passing no user data, but including the appropriate flag in the
1340 * ancillary data (see Section xxxx).
1342 * If sd in the close() call is a branched-off socket representing only
1343 * one association, the shutdown is performed on that association only.
1345 * 4.1.6 close() - TCP Style Syntax
1347 * Applications use close() to gracefully close down an association.
1351 * int close(int sd);
1353 * sd - the socket descriptor of the association to be closed.
1355 * After an application calls close() on a socket descriptor, no further
1356 * socket operations will succeed on that descriptor.
1358 * API 7.1.4 SO_LINGER
1360 * An application using the TCP-style socket can use this option to
1361 * perform the SCTP ABORT primitive. The linger option structure is:
1364 * int l_onoff; // option on/off
1365 * int l_linger; // linger time
1368 * To enable the option, set l_onoff to 1. If the l_linger value is set
1369 * to 0, calling close() is the same as the ABORT primitive. If the
1370 * value is set to a negative value, the setsockopt() call will return
1371 * an error. If the value is set to a positive value linger_time, the
1372 * close() can be blocked for at most linger_time ms. If the graceful
1373 * shutdown phase does not finish during this period, close() will
1374 * return but the graceful shutdown phase continues in the system.
1376 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1378 struct sctp_endpoint
*ep
;
1379 struct sctp_association
*asoc
;
1380 struct list_head
*pos
, *temp
;
1382 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1385 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1386 sk
->sk_state
= SCTP_SS_CLOSING
;
1388 ep
= sctp_sk(sk
)->ep
;
1390 /* Walk all associations on an endpoint. */
1391 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1392 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1394 if (sctp_style(sk
, TCP
)) {
1395 /* A closed association can still be in the list if
1396 * it belongs to a TCP-style listening socket that is
1397 * not yet accepted. If so, free it. If not, send an
1398 * ABORT or SHUTDOWN based on the linger options.
1400 if (sctp_state(asoc
, CLOSED
)) {
1401 sctp_unhash_established(asoc
);
1402 sctp_association_free(asoc
);
1407 if (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
) {
1408 struct sctp_chunk
*chunk
;
1410 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1412 sctp_primitive_ABORT(asoc
, chunk
);
1414 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1417 /* Clean up any skbs sitting on the receive queue. */
1418 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1419 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1421 /* On a TCP-style socket, block for at most linger_time if set. */
1422 if (sctp_style(sk
, TCP
) && timeout
)
1423 sctp_wait_for_close(sk
, timeout
);
1425 /* This will run the backlog queue. */
1426 sctp_release_sock(sk
);
1428 /* Supposedly, no process has access to the socket, but
1429 * the net layers still may.
1431 sctp_local_bh_disable();
1432 sctp_bh_lock_sock(sk
);
1434 /* Hold the sock, since sk_common_release() will put sock_put()
1435 * and we have just a little more cleanup.
1438 sk_common_release(sk
);
1440 sctp_bh_unlock_sock(sk
);
1441 sctp_local_bh_enable();
1445 SCTP_DBG_OBJCNT_DEC(sock
);
1448 /* Handle EPIPE error. */
1449 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1452 err
= sock_error(sk
) ? : -EPIPE
;
1453 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1454 send_sig(SIGPIPE
, current
, 0);
1458 /* API 3.1.3 sendmsg() - UDP Style Syntax
1460 * An application uses sendmsg() and recvmsg() calls to transmit data to
1461 * and receive data from its peer.
1463 * ssize_t sendmsg(int socket, const struct msghdr *message,
1466 * socket - the socket descriptor of the endpoint.
1467 * message - pointer to the msghdr structure which contains a single
1468 * user message and possibly some ancillary data.
1470 * See Section 5 for complete description of the data
1473 * flags - flags sent or received with the user message, see Section
1474 * 5 for complete description of the flags.
1476 * Note: This function could use a rewrite especially when explicit
1477 * connect support comes in.
1479 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1481 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1483 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1484 struct msghdr
*msg
, size_t msg_len
)
1486 struct sctp_sock
*sp
;
1487 struct sctp_endpoint
*ep
;
1488 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1489 struct sctp_transport
*transport
, *chunk_tp
;
1490 struct sctp_chunk
*chunk
;
1492 struct sockaddr
*msg_name
= NULL
;
1493 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1494 struct sctp_sndrcvinfo
*sinfo
;
1495 struct sctp_initmsg
*sinit
;
1496 sctp_assoc_t associd
= 0;
1497 sctp_cmsgs_t cmsgs
= { NULL
};
1501 __u16 sinfo_flags
= 0;
1502 struct sctp_datamsg
*datamsg
;
1503 int msg_flags
= msg
->msg_flags
;
1505 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1512 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1514 /* We cannot send a message over a TCP-style listening socket. */
1515 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1520 /* Parse out the SCTP CMSGs. */
1521 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1524 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1528 /* Fetch the destination address for this packet. This
1529 * address only selects the association--it is not necessarily
1530 * the address we will send to.
1531 * For a peeled-off socket, msg_name is ignored.
1533 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1534 int msg_namelen
= msg
->msg_namelen
;
1536 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1541 if (msg_namelen
> sizeof(to
))
1542 msg_namelen
= sizeof(to
);
1543 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1544 msg_name
= msg
->msg_name
;
1550 /* Did the user specify SNDRCVINFO? */
1552 sinfo_flags
= sinfo
->sinfo_flags
;
1553 associd
= sinfo
->sinfo_assoc_id
;
1556 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1557 msg_len
, sinfo_flags
);
1559 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1560 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1565 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1566 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1567 * If SCTP_ABORT is set, the message length could be non zero with
1568 * the msg_iov set to the user abort reason.
1570 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1571 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1576 /* If SCTP_ADDR_OVER is set, there must be an address
1577 * specified in msg_name.
1579 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1586 SCTP_DEBUG_PRINTK("About to look up association.\n");
1590 /* If a msg_name has been specified, assume this is to be used. */
1592 /* Look for a matching association on the endpoint. */
1593 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1595 /* If we could not find a matching association on the
1596 * endpoint, make sure that it is not a TCP-style
1597 * socket that already has an association or there is
1598 * no peeled-off association on another socket.
1600 if ((sctp_style(sk
, TCP
) &&
1601 sctp_sstate(sk
, ESTABLISHED
)) ||
1602 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1603 err
= -EADDRNOTAVAIL
;
1608 asoc
= sctp_id2assoc(sk
, associd
);
1616 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1618 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1619 * socket that has an association in CLOSED state. This can
1620 * happen when an accepted socket has an association that is
1623 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1628 if (sinfo_flags
& SCTP_EOF
) {
1629 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1631 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1635 if (sinfo_flags
& SCTP_ABORT
) {
1637 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1643 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1644 sctp_primitive_ABORT(asoc
, chunk
);
1650 /* Do we need to create the association? */
1652 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1654 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1659 /* Check for invalid stream against the stream counts,
1660 * either the default or the user specified stream counts.
1663 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1664 /* Check against the defaults. */
1665 if (sinfo
->sinfo_stream
>=
1666 sp
->initmsg
.sinit_num_ostreams
) {
1671 /* Check against the requested. */
1672 if (sinfo
->sinfo_stream
>=
1673 sinit
->sinit_num_ostreams
) {
1681 * API 3.1.2 bind() - UDP Style Syntax
1682 * If a bind() or sctp_bindx() is not called prior to a
1683 * sendmsg() call that initiates a new association, the
1684 * system picks an ephemeral port and will choose an address
1685 * set equivalent to binding with a wildcard address.
1687 if (!ep
->base
.bind_addr
.port
) {
1688 if (sctp_autobind(sk
)) {
1694 * If an unprivileged user inherits a one-to-many
1695 * style socket with open associations on a privileged
1696 * port, it MAY be permitted to accept new associations,
1697 * but it SHOULD NOT be permitted to open new
1700 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1701 !capable(CAP_NET_BIND_SERVICE
)) {
1707 scope
= sctp_scope(&to
);
1708 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1714 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
, GFP_KERNEL
);
1720 /* If the SCTP_INIT ancillary data is specified, set all
1721 * the association init values accordingly.
1724 if (sinit
->sinit_num_ostreams
) {
1725 asoc
->c
.sinit_num_ostreams
=
1726 sinit
->sinit_num_ostreams
;
1728 if (sinit
->sinit_max_instreams
) {
1729 asoc
->c
.sinit_max_instreams
=
1730 sinit
->sinit_max_instreams
;
1732 if (sinit
->sinit_max_attempts
) {
1733 asoc
->max_init_attempts
1734 = sinit
->sinit_max_attempts
;
1736 if (sinit
->sinit_max_init_timeo
) {
1737 asoc
->max_init_timeo
=
1738 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1742 /* Prime the peer's transport structures. */
1743 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1750 /* ASSERT: we have a valid association at this point. */
1751 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1754 /* If the user didn't specify SNDRCVINFO, make up one with
1757 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1758 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1759 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1760 default_sinfo
.sinfo_context
= asoc
->default_context
;
1761 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1762 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1763 sinfo
= &default_sinfo
;
1766 /* API 7.1.7, the sndbuf size per association bounds the
1767 * maximum size of data that can be sent in a single send call.
1769 if (msg_len
> sk
->sk_sndbuf
) {
1774 if (asoc
->pmtu_pending
)
1775 sctp_assoc_pending_pmtu(asoc
);
1777 /* If fragmentation is disabled and the message length exceeds the
1778 * association fragmentation point, return EMSGSIZE. The I-D
1779 * does not specify what this error is, but this looks like
1782 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1788 /* Check for invalid stream. */
1789 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1795 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1796 if (!sctp_wspace(asoc
)) {
1797 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1802 /* If an address is passed with the sendto/sendmsg call, it is used
1803 * to override the primary destination address in the TCP model, or
1804 * when SCTP_ADDR_OVER flag is set in the UDP model.
1806 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1807 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1808 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1816 /* Auto-connect, if we aren't connected already. */
1817 if (sctp_state(asoc
, CLOSED
)) {
1818 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1821 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1824 /* Break the message into multiple chunks of maximum size. */
1825 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1831 /* Now send the (possibly) fragmented message. */
1832 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1833 sctp_chunk_hold(chunk
);
1835 /* Do accounting for the write space. */
1836 sctp_set_owner_w(chunk
);
1838 chunk
->transport
= chunk_tp
;
1841 /* Send it to the lower layers. Note: all chunks
1842 * must either fail or succeed. The lower layer
1843 * works that way today. Keep it that way or this
1846 err
= sctp_primitive_SEND(asoc
, datamsg
);
1847 /* Did the lower layer accept the chunk? */
1849 sctp_datamsg_free(datamsg
);
1851 sctp_datamsg_put(datamsg
);
1853 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1860 /* If we are already past ASSOCIATE, the lower
1861 * layers are responsible for association cleanup.
1867 sctp_association_free(asoc
);
1869 sctp_release_sock(sk
);
1872 return sctp_error(sk
, msg_flags
, err
);
1879 err
= sock_error(sk
);
1889 /* This is an extended version of skb_pull() that removes the data from the
1890 * start of a skb even when data is spread across the list of skb's in the
1891 * frag_list. len specifies the total amount of data that needs to be removed.
1892 * when 'len' bytes could be removed from the skb, it returns 0.
1893 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1894 * could not be removed.
1896 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1898 struct sk_buff
*list
;
1899 int skb_len
= skb_headlen(skb
);
1902 if (len
<= skb_len
) {
1903 __skb_pull(skb
, len
);
1907 __skb_pull(skb
, skb_len
);
1909 skb_walk_frags(skb
, list
) {
1910 rlen
= sctp_skb_pull(list
, len
);
1911 skb
->len
-= (len
-rlen
);
1912 skb
->data_len
-= (len
-rlen
);
1923 /* API 3.1.3 recvmsg() - UDP Style Syntax
1925 * ssize_t recvmsg(int socket, struct msghdr *message,
1928 * socket - the socket descriptor of the endpoint.
1929 * message - pointer to the msghdr structure which contains a single
1930 * user message and possibly some ancillary data.
1932 * See Section 5 for complete description of the data
1935 * flags - flags sent or received with the user message, see Section
1936 * 5 for complete description of the flags.
1938 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1940 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1941 struct msghdr
*msg
, size_t len
, int noblock
,
1942 int flags
, int *addr_len
)
1944 struct sctp_ulpevent
*event
= NULL
;
1945 struct sctp_sock
*sp
= sctp_sk(sk
);
1946 struct sk_buff
*skb
;
1951 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1952 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1953 "len", len
, "knoblauch", noblock
,
1954 "flags", flags
, "addr_len", addr_len
);
1958 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1963 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1967 /* Get the total length of the skb including any skb's in the
1976 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1978 event
= sctp_skb2event(skb
);
1983 sock_recv_ts_and_drops(msg
, sk
, skb
);
1984 if (sctp_ulpevent_is_notification(event
)) {
1985 msg
->msg_flags
|= MSG_NOTIFICATION
;
1986 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1988 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1991 /* Check if we allow SCTP_SNDRCVINFO. */
1992 if (sp
->subscribe
.sctp_data_io_event
)
1993 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1995 /* FIXME: we should be calling IP/IPv6 layers. */
1996 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1997 ip_cmsg_recv(msg
, skb
);
2002 /* If skb's length exceeds the user's buffer, update the skb and
2003 * push it back to the receive_queue so that the next call to
2004 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2006 if (skb_len
> copied
) {
2007 msg
->msg_flags
&= ~MSG_EOR
;
2008 if (flags
& MSG_PEEK
)
2010 sctp_skb_pull(skb
, copied
);
2011 skb_queue_head(&sk
->sk_receive_queue
, skb
);
2013 /* When only partial message is copied to the user, increase
2014 * rwnd by that amount. If all the data in the skb is read,
2015 * rwnd is updated when the event is freed.
2017 if (!sctp_ulpevent_is_notification(event
))
2018 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
2020 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
2021 (event
->msg_flags
& MSG_EOR
))
2022 msg
->msg_flags
|= MSG_EOR
;
2024 msg
->msg_flags
&= ~MSG_EOR
;
2027 if (flags
& MSG_PEEK
) {
2028 /* Release the skb reference acquired after peeking the skb in
2029 * sctp_skb_recv_datagram().
2033 /* Free the event which includes releasing the reference to
2034 * the owner of the skb, freeing the skb and updating the
2037 sctp_ulpevent_free(event
);
2040 sctp_release_sock(sk
);
2044 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2046 * This option is a on/off flag. If enabled no SCTP message
2047 * fragmentation will be performed. Instead if a message being sent
2048 * exceeds the current PMTU size, the message will NOT be sent and
2049 * instead a error will be indicated to the user.
2051 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
2052 char __user
*optval
,
2053 unsigned int optlen
)
2057 if (optlen
< sizeof(int))
2060 if (get_user(val
, (int __user
*)optval
))
2063 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
2068 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2069 unsigned int optlen
)
2071 if (optlen
> sizeof(struct sctp_event_subscribe
))
2073 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2078 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2080 * This socket option is applicable to the UDP-style socket only. When
2081 * set it will cause associations that are idle for more than the
2082 * specified number of seconds to automatically close. An association
2083 * being idle is defined an association that has NOT sent or received
2084 * user data. The special value of '0' indicates that no automatic
2085 * close of any associations should be performed. The option expects an
2086 * integer defining the number of seconds of idle time before an
2087 * association is closed.
2089 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2090 unsigned int optlen
)
2092 struct sctp_sock
*sp
= sctp_sk(sk
);
2094 /* Applicable to UDP-style socket only */
2095 if (sctp_style(sk
, TCP
))
2097 if (optlen
!= sizeof(int))
2099 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2101 /* make sure it won't exceed MAX_SCHEDULE_TIMEOUT */
2102 sp
->autoclose
= min_t(long, sp
->autoclose
, MAX_SCHEDULE_TIMEOUT
/ HZ
);
2107 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2109 * Applications can enable or disable heartbeats for any peer address of
2110 * an association, modify an address's heartbeat interval, force a
2111 * heartbeat to be sent immediately, and adjust the address's maximum
2112 * number of retransmissions sent before an address is considered
2113 * unreachable. The following structure is used to access and modify an
2114 * address's parameters:
2116 * struct sctp_paddrparams {
2117 * sctp_assoc_t spp_assoc_id;
2118 * struct sockaddr_storage spp_address;
2119 * uint32_t spp_hbinterval;
2120 * uint16_t spp_pathmaxrxt;
2121 * uint32_t spp_pathmtu;
2122 * uint32_t spp_sackdelay;
2123 * uint32_t spp_flags;
2126 * spp_assoc_id - (one-to-many style socket) This is filled in the
2127 * application, and identifies the association for
2129 * spp_address - This specifies which address is of interest.
2130 * spp_hbinterval - This contains the value of the heartbeat interval,
2131 * in milliseconds. If a value of zero
2132 * is present in this field then no changes are to
2133 * be made to this parameter.
2134 * spp_pathmaxrxt - This contains the maximum number of
2135 * retransmissions before this address shall be
2136 * considered unreachable. If a value of zero
2137 * is present in this field then no changes are to
2138 * be made to this parameter.
2139 * spp_pathmtu - When Path MTU discovery is disabled the value
2140 * specified here will be the "fixed" path mtu.
2141 * Note that if the spp_address field is empty
2142 * then all associations on this address will
2143 * have this fixed path mtu set upon them.
2145 * spp_sackdelay - When delayed sack is enabled, this value specifies
2146 * the number of milliseconds that sacks will be delayed
2147 * for. This value will apply to all addresses of an
2148 * association if the spp_address field is empty. Note
2149 * also, that if delayed sack is enabled and this
2150 * value is set to 0, no change is made to the last
2151 * recorded delayed sack timer value.
2153 * spp_flags - These flags are used to control various features
2154 * on an association. The flag field may contain
2155 * zero or more of the following options.
2157 * SPP_HB_ENABLE - Enable heartbeats on the
2158 * specified address. Note that if the address
2159 * field is empty all addresses for the association
2160 * have heartbeats enabled upon them.
2162 * SPP_HB_DISABLE - Disable heartbeats on the
2163 * speicifed address. Note that if the address
2164 * field is empty all addresses for the association
2165 * will have their heartbeats disabled. Note also
2166 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2167 * mutually exclusive, only one of these two should
2168 * be specified. Enabling both fields will have
2169 * undetermined results.
2171 * SPP_HB_DEMAND - Request a user initiated heartbeat
2172 * to be made immediately.
2174 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2175 * heartbeat delayis to be set to the value of 0
2178 * SPP_PMTUD_ENABLE - This field will enable PMTU
2179 * discovery upon the specified address. Note that
2180 * if the address feild is empty then all addresses
2181 * on the association are effected.
2183 * SPP_PMTUD_DISABLE - This field will disable PMTU
2184 * discovery upon the specified address. Note that
2185 * if the address feild is empty then all addresses
2186 * on the association are effected. Not also that
2187 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2188 * exclusive. Enabling both will have undetermined
2191 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2192 * on delayed sack. The time specified in spp_sackdelay
2193 * is used to specify the sack delay for this address. Note
2194 * that if spp_address is empty then all addresses will
2195 * enable delayed sack and take on the sack delay
2196 * value specified in spp_sackdelay.
2197 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2198 * off delayed sack. If the spp_address field is blank then
2199 * delayed sack is disabled for the entire association. Note
2200 * also that this field is mutually exclusive to
2201 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2204 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2205 struct sctp_transport
*trans
,
2206 struct sctp_association
*asoc
,
2207 struct sctp_sock
*sp
,
2210 int sackdelay_change
)
2214 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2215 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2220 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2221 * this field is ignored. Note also that a value of zero indicates
2222 * the current setting should be left unchanged.
2224 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2226 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2227 * set. This lets us use 0 value when this flag
2230 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2231 params
->spp_hbinterval
= 0;
2233 if (params
->spp_hbinterval
||
2234 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2237 msecs_to_jiffies(params
->spp_hbinterval
);
2240 msecs_to_jiffies(params
->spp_hbinterval
);
2242 sp
->hbinterval
= params
->spp_hbinterval
;
2249 trans
->param_flags
=
2250 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2253 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2256 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2260 /* When Path MTU discovery is disabled the value specified here will
2261 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2262 * include the flag SPP_PMTUD_DISABLE for this field to have any
2265 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2267 trans
->pathmtu
= params
->spp_pathmtu
;
2268 sctp_assoc_sync_pmtu(asoc
);
2270 asoc
->pathmtu
= params
->spp_pathmtu
;
2271 sctp_frag_point(asoc
, params
->spp_pathmtu
);
2273 sp
->pathmtu
= params
->spp_pathmtu
;
2279 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2280 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2281 trans
->param_flags
=
2282 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2284 sctp_transport_pmtu(trans
);
2285 sctp_assoc_sync_pmtu(asoc
);
2289 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2292 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2296 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2297 * value of this field is ignored. Note also that a value of zero
2298 * indicates the current setting should be left unchanged.
2300 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2303 msecs_to_jiffies(params
->spp_sackdelay
);
2306 msecs_to_jiffies(params
->spp_sackdelay
);
2308 sp
->sackdelay
= params
->spp_sackdelay
;
2312 if (sackdelay_change
) {
2314 trans
->param_flags
=
2315 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2319 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2323 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2328 /* Note that a value of zero indicates the current setting should be
2331 if (params
->spp_pathmaxrxt
) {
2333 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2335 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2337 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2344 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2345 char __user
*optval
,
2346 unsigned int optlen
)
2348 struct sctp_paddrparams params
;
2349 struct sctp_transport
*trans
= NULL
;
2350 struct sctp_association
*asoc
= NULL
;
2351 struct sctp_sock
*sp
= sctp_sk(sk
);
2353 int hb_change
, pmtud_change
, sackdelay_change
;
2355 if (optlen
!= sizeof(struct sctp_paddrparams
))
2358 if (copy_from_user(¶ms
, optval
, optlen
))
2361 /* Validate flags and value parameters. */
2362 hb_change
= params
.spp_flags
& SPP_HB
;
2363 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2364 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2366 if (hb_change
== SPP_HB
||
2367 pmtud_change
== SPP_PMTUD
||
2368 sackdelay_change
== SPP_SACKDELAY
||
2369 params
.spp_sackdelay
> 500 ||
2370 (params
.spp_pathmtu
&&
2371 params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2374 /* If an address other than INADDR_ANY is specified, and
2375 * no transport is found, then the request is invalid.
2377 if (!sctp_is_any(sk
, ( union sctp_addr
*)¶ms
.spp_address
)) {
2378 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2379 params
.spp_assoc_id
);
2384 /* Get association, if assoc_id != 0 and the socket is a one
2385 * to many style socket, and an association was not found, then
2386 * the id was invalid.
2388 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2389 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2392 /* Heartbeat demand can only be sent on a transport or
2393 * association, but not a socket.
2395 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2398 /* Process parameters. */
2399 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2400 hb_change
, pmtud_change
,
2406 /* If changes are for association, also apply parameters to each
2409 if (!trans
&& asoc
) {
2410 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2412 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2413 hb_change
, pmtud_change
,
2422 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2424 * This option will effect the way delayed acks are performed. This
2425 * option allows you to get or set the delayed ack time, in
2426 * milliseconds. It also allows changing the delayed ack frequency.
2427 * Changing the frequency to 1 disables the delayed sack algorithm. If
2428 * the assoc_id is 0, then this sets or gets the endpoints default
2429 * values. If the assoc_id field is non-zero, then the set or get
2430 * effects the specified association for the one to many model (the
2431 * assoc_id field is ignored by the one to one model). Note that if
2432 * sack_delay or sack_freq are 0 when setting this option, then the
2433 * current values will remain unchanged.
2435 * struct sctp_sack_info {
2436 * sctp_assoc_t sack_assoc_id;
2437 * uint32_t sack_delay;
2438 * uint32_t sack_freq;
2441 * sack_assoc_id - This parameter, indicates which association the user
2442 * is performing an action upon. Note that if this field's value is
2443 * zero then the endpoints default value is changed (effecting future
2444 * associations only).
2446 * sack_delay - This parameter contains the number of milliseconds that
2447 * the user is requesting the delayed ACK timer be set to. Note that
2448 * this value is defined in the standard to be between 200 and 500
2451 * sack_freq - This parameter contains the number of packets that must
2452 * be received before a sack is sent without waiting for the delay
2453 * timer to expire. The default value for this is 2, setting this
2454 * value to 1 will disable the delayed sack algorithm.
2457 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2458 char __user
*optval
, unsigned int optlen
)
2460 struct sctp_sack_info params
;
2461 struct sctp_transport
*trans
= NULL
;
2462 struct sctp_association
*asoc
= NULL
;
2463 struct sctp_sock
*sp
= sctp_sk(sk
);
2465 if (optlen
== sizeof(struct sctp_sack_info
)) {
2466 if (copy_from_user(¶ms
, optval
, optlen
))
2469 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2471 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2472 printk(KERN_WARNING
"SCTP: Use of struct sctp_assoc_value "
2473 "in delayed_ack socket option deprecated\n");
2474 printk(KERN_WARNING
"SCTP: Use struct sctp_sack_info instead\n");
2475 if (copy_from_user(¶ms
, optval
, optlen
))
2478 if (params
.sack_delay
== 0)
2479 params
.sack_freq
= 1;
2481 params
.sack_freq
= 0;
2485 /* Validate value parameter. */
2486 if (params
.sack_delay
> 500)
2489 /* Get association, if sack_assoc_id != 0 and the socket is a one
2490 * to many style socket, and an association was not found, then
2491 * the id was invalid.
2493 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2494 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2497 if (params
.sack_delay
) {
2500 msecs_to_jiffies(params
.sack_delay
);
2502 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2503 SPP_SACKDELAY_ENABLE
;
2505 sp
->sackdelay
= params
.sack_delay
;
2507 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2508 SPP_SACKDELAY_ENABLE
;
2512 if (params
.sack_freq
== 1) {
2515 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2516 SPP_SACKDELAY_DISABLE
;
2519 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2520 SPP_SACKDELAY_DISABLE
;
2522 } else if (params
.sack_freq
> 1) {
2524 asoc
->sackfreq
= params
.sack_freq
;
2526 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2527 SPP_SACKDELAY_ENABLE
;
2529 sp
->sackfreq
= params
.sack_freq
;
2531 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2532 SPP_SACKDELAY_ENABLE
;
2536 /* If change is for association, also apply to each transport. */
2538 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2540 if (params
.sack_delay
) {
2542 msecs_to_jiffies(params
.sack_delay
);
2543 trans
->param_flags
=
2544 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2545 SPP_SACKDELAY_ENABLE
;
2547 if (params
.sack_freq
== 1) {
2548 trans
->param_flags
=
2549 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2550 SPP_SACKDELAY_DISABLE
;
2551 } else if (params
.sack_freq
> 1) {
2552 trans
->sackfreq
= params
.sack_freq
;
2553 trans
->param_flags
=
2554 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2555 SPP_SACKDELAY_ENABLE
;
2563 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2565 * Applications can specify protocol parameters for the default association
2566 * initialization. The option name argument to setsockopt() and getsockopt()
2569 * Setting initialization parameters is effective only on an unconnected
2570 * socket (for UDP-style sockets only future associations are effected
2571 * by the change). With TCP-style sockets, this option is inherited by
2572 * sockets derived from a listener socket.
2574 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2576 struct sctp_initmsg sinit
;
2577 struct sctp_sock
*sp
= sctp_sk(sk
);
2579 if (optlen
!= sizeof(struct sctp_initmsg
))
2581 if (copy_from_user(&sinit
, optval
, optlen
))
2584 if (sinit
.sinit_num_ostreams
)
2585 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2586 if (sinit
.sinit_max_instreams
)
2587 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2588 if (sinit
.sinit_max_attempts
)
2589 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2590 if (sinit
.sinit_max_init_timeo
)
2591 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2597 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2599 * Applications that wish to use the sendto() system call may wish to
2600 * specify a default set of parameters that would normally be supplied
2601 * through the inclusion of ancillary data. This socket option allows
2602 * such an application to set the default sctp_sndrcvinfo structure.
2603 * The application that wishes to use this socket option simply passes
2604 * in to this call the sctp_sndrcvinfo structure defined in Section
2605 * 5.2.2) The input parameters accepted by this call include
2606 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2607 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2608 * to this call if the caller is using the UDP model.
2610 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2611 char __user
*optval
,
2612 unsigned int optlen
)
2614 struct sctp_sndrcvinfo info
;
2615 struct sctp_association
*asoc
;
2616 struct sctp_sock
*sp
= sctp_sk(sk
);
2618 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2620 if (copy_from_user(&info
, optval
, optlen
))
2623 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2624 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2628 asoc
->default_stream
= info
.sinfo_stream
;
2629 asoc
->default_flags
= info
.sinfo_flags
;
2630 asoc
->default_ppid
= info
.sinfo_ppid
;
2631 asoc
->default_context
= info
.sinfo_context
;
2632 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2634 sp
->default_stream
= info
.sinfo_stream
;
2635 sp
->default_flags
= info
.sinfo_flags
;
2636 sp
->default_ppid
= info
.sinfo_ppid
;
2637 sp
->default_context
= info
.sinfo_context
;
2638 sp
->default_timetolive
= info
.sinfo_timetolive
;
2644 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2646 * Requests that the local SCTP stack use the enclosed peer address as
2647 * the association primary. The enclosed address must be one of the
2648 * association peer's addresses.
2650 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2651 unsigned int optlen
)
2653 struct sctp_prim prim
;
2654 struct sctp_transport
*trans
;
2656 if (optlen
!= sizeof(struct sctp_prim
))
2659 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2662 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2666 sctp_assoc_set_primary(trans
->asoc
, trans
);
2672 * 7.1.5 SCTP_NODELAY
2674 * Turn on/off any Nagle-like algorithm. This means that packets are
2675 * generally sent as soon as possible and no unnecessary delays are
2676 * introduced, at the cost of more packets in the network. Expects an
2677 * integer boolean flag.
2679 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2680 unsigned int optlen
)
2684 if (optlen
< sizeof(int))
2686 if (get_user(val
, (int __user
*)optval
))
2689 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2695 * 7.1.1 SCTP_RTOINFO
2697 * The protocol parameters used to initialize and bound retransmission
2698 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2699 * and modify these parameters.
2700 * All parameters are time values, in milliseconds. A value of 0, when
2701 * modifying the parameters, indicates that the current value should not
2705 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2707 struct sctp_rtoinfo rtoinfo
;
2708 struct sctp_association
*asoc
;
2710 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2713 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2716 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2718 /* Set the values to the specific association */
2719 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2723 if (rtoinfo
.srto_initial
!= 0)
2725 msecs_to_jiffies(rtoinfo
.srto_initial
);
2726 if (rtoinfo
.srto_max
!= 0)
2727 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2728 if (rtoinfo
.srto_min
!= 0)
2729 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2731 /* If there is no association or the association-id = 0
2732 * set the values to the endpoint.
2734 struct sctp_sock
*sp
= sctp_sk(sk
);
2736 if (rtoinfo
.srto_initial
!= 0)
2737 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2738 if (rtoinfo
.srto_max
!= 0)
2739 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2740 if (rtoinfo
.srto_min
!= 0)
2741 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2749 * 7.1.2 SCTP_ASSOCINFO
2751 * This option is used to tune the maximum retransmission attempts
2752 * of the association.
2753 * Returns an error if the new association retransmission value is
2754 * greater than the sum of the retransmission value of the peer.
2755 * See [SCTP] for more information.
2758 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2761 struct sctp_assocparams assocparams
;
2762 struct sctp_association
*asoc
;
2764 if (optlen
!= sizeof(struct sctp_assocparams
))
2766 if (copy_from_user(&assocparams
, optval
, optlen
))
2769 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2771 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2774 /* Set the values to the specific association */
2776 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2779 struct sctp_transport
*peer_addr
;
2781 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
2783 path_sum
+= peer_addr
->pathmaxrxt
;
2787 /* Only validate asocmaxrxt if we have more than
2788 * one path/transport. We do this because path
2789 * retransmissions are only counted when we have more
2793 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2796 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2799 if (assocparams
.sasoc_cookie_life
!= 0) {
2800 asoc
->cookie_life
.tv_sec
=
2801 assocparams
.sasoc_cookie_life
/ 1000;
2802 asoc
->cookie_life
.tv_usec
=
2803 (assocparams
.sasoc_cookie_life
% 1000)
2807 /* Set the values to the endpoint */
2808 struct sctp_sock
*sp
= sctp_sk(sk
);
2810 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2811 sp
->assocparams
.sasoc_asocmaxrxt
=
2812 assocparams
.sasoc_asocmaxrxt
;
2813 if (assocparams
.sasoc_cookie_life
!= 0)
2814 sp
->assocparams
.sasoc_cookie_life
=
2815 assocparams
.sasoc_cookie_life
;
2821 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2823 * This socket option is a boolean flag which turns on or off mapped V4
2824 * addresses. If this option is turned on and the socket is type
2825 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2826 * If this option is turned off, then no mapping will be done of V4
2827 * addresses and a user will receive both PF_INET6 and PF_INET type
2828 * addresses on the socket.
2830 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2833 struct sctp_sock
*sp
= sctp_sk(sk
);
2835 if (optlen
< sizeof(int))
2837 if (get_user(val
, (int __user
*)optval
))
2848 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2849 * This option will get or set the maximum size to put in any outgoing
2850 * SCTP DATA chunk. If a message is larger than this size it will be
2851 * fragmented by SCTP into the specified size. Note that the underlying
2852 * SCTP implementation may fragment into smaller sized chunks when the
2853 * PMTU of the underlying association is smaller than the value set by
2854 * the user. The default value for this option is '0' which indicates
2855 * the user is NOT limiting fragmentation and only the PMTU will effect
2856 * SCTP's choice of DATA chunk size. Note also that values set larger
2857 * than the maximum size of an IP datagram will effectively let SCTP
2858 * control fragmentation (i.e. the same as setting this option to 0).
2860 * The following structure is used to access and modify this parameter:
2862 * struct sctp_assoc_value {
2863 * sctp_assoc_t assoc_id;
2864 * uint32_t assoc_value;
2867 * assoc_id: This parameter is ignored for one-to-one style sockets.
2868 * For one-to-many style sockets this parameter indicates which
2869 * association the user is performing an action upon. Note that if
2870 * this field's value is zero then the endpoints default value is
2871 * changed (effecting future associations only).
2872 * assoc_value: This parameter specifies the maximum size in bytes.
2874 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2876 struct sctp_assoc_value params
;
2877 struct sctp_association
*asoc
;
2878 struct sctp_sock
*sp
= sctp_sk(sk
);
2881 if (optlen
== sizeof(int)) {
2883 "SCTP: Use of int in maxseg socket option deprecated\n");
2885 "SCTP: Use struct sctp_assoc_value instead\n");
2886 if (copy_from_user(&val
, optval
, optlen
))
2888 params
.assoc_id
= 0;
2889 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2890 if (copy_from_user(¶ms
, optval
, optlen
))
2892 val
= params
.assoc_value
;
2896 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2899 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2900 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
2905 val
= asoc
->pathmtu
;
2906 val
-= sp
->pf
->af
->net_header_len
;
2907 val
-= sizeof(struct sctphdr
) +
2908 sizeof(struct sctp_data_chunk
);
2910 asoc
->user_frag
= val
;
2911 asoc
->frag_point
= sctp_frag_point(asoc
, asoc
->pathmtu
);
2913 sp
->user_frag
= val
;
2921 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2923 * Requests that the peer mark the enclosed address as the association
2924 * primary. The enclosed address must be one of the association's
2925 * locally bound addresses. The following structure is used to make a
2926 * set primary request:
2928 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2929 unsigned int optlen
)
2931 struct sctp_sock
*sp
;
2932 struct sctp_endpoint
*ep
;
2933 struct sctp_association
*asoc
= NULL
;
2934 struct sctp_setpeerprim prim
;
2935 struct sctp_chunk
*chunk
;
2941 if (!sctp_addip_enable
)
2944 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2947 if (copy_from_user(&prim
, optval
, optlen
))
2950 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2954 if (!asoc
->peer
.asconf_capable
)
2957 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2960 if (!sctp_state(asoc
, ESTABLISHED
))
2963 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2964 return -EADDRNOTAVAIL
;
2966 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2967 chunk
= sctp_make_asconf_set_prim(asoc
,
2968 (union sctp_addr
*)&prim
.sspp_addr
);
2972 err
= sctp_send_asconf(asoc
, chunk
);
2974 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2979 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
2980 unsigned int optlen
)
2982 struct sctp_setadaptation adaptation
;
2984 if (optlen
!= sizeof(struct sctp_setadaptation
))
2986 if (copy_from_user(&adaptation
, optval
, optlen
))
2989 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
2995 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2997 * The context field in the sctp_sndrcvinfo structure is normally only
2998 * used when a failed message is retrieved holding the value that was
2999 * sent down on the actual send call. This option allows the setting of
3000 * a default context on an association basis that will be received on
3001 * reading messages from the peer. This is especially helpful in the
3002 * one-2-many model for an application to keep some reference to an
3003 * internal state machine that is processing messages on the
3004 * association. Note that the setting of this value only effects
3005 * received messages from the peer and does not effect the value that is
3006 * saved with outbound messages.
3008 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
3009 unsigned int optlen
)
3011 struct sctp_assoc_value params
;
3012 struct sctp_sock
*sp
;
3013 struct sctp_association
*asoc
;
3015 if (optlen
!= sizeof(struct sctp_assoc_value
))
3017 if (copy_from_user(¶ms
, optval
, optlen
))
3022 if (params
.assoc_id
!= 0) {
3023 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3026 asoc
->default_rcv_context
= params
.assoc_value
;
3028 sp
->default_rcv_context
= params
.assoc_value
;
3035 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3037 * This options will at a minimum specify if the implementation is doing
3038 * fragmented interleave. Fragmented interleave, for a one to many
3039 * socket, is when subsequent calls to receive a message may return
3040 * parts of messages from different associations. Some implementations
3041 * may allow you to turn this value on or off. If so, when turned off,
3042 * no fragment interleave will occur (which will cause a head of line
3043 * blocking amongst multiple associations sharing the same one to many
3044 * socket). When this option is turned on, then each receive call may
3045 * come from a different association (thus the user must receive data
3046 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3047 * association each receive belongs to.
3049 * This option takes a boolean value. A non-zero value indicates that
3050 * fragmented interleave is on. A value of zero indicates that
3051 * fragmented interleave is off.
3053 * Note that it is important that an implementation that allows this
3054 * option to be turned on, have it off by default. Otherwise an unaware
3055 * application using the one to many model may become confused and act
3058 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
3059 char __user
*optval
,
3060 unsigned int optlen
)
3064 if (optlen
!= sizeof(int))
3066 if (get_user(val
, (int __user
*)optval
))
3069 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
3075 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3076 * (SCTP_PARTIAL_DELIVERY_POINT)
3078 * This option will set or get the SCTP partial delivery point. This
3079 * point is the size of a message where the partial delivery API will be
3080 * invoked to help free up rwnd space for the peer. Setting this to a
3081 * lower value will cause partial deliveries to happen more often. The
3082 * calls argument is an integer that sets or gets the partial delivery
3083 * point. Note also that the call will fail if the user attempts to set
3084 * this value larger than the socket receive buffer size.
3086 * Note that any single message having a length smaller than or equal to
3087 * the SCTP partial delivery point will be delivered in one single read
3088 * call as long as the user provided buffer is large enough to hold the
3091 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
3092 char __user
*optval
,
3093 unsigned int optlen
)
3097 if (optlen
!= sizeof(u32
))
3099 if (get_user(val
, (int __user
*)optval
))
3102 /* Note: We double the receive buffer from what the user sets
3103 * it to be, also initial rwnd is based on rcvbuf/2.
3105 if (val
> (sk
->sk_rcvbuf
>> 1))
3108 sctp_sk(sk
)->pd_point
= val
;
3110 return 0; /* is this the right error code? */
3114 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3116 * This option will allow a user to change the maximum burst of packets
3117 * that can be emitted by this association. Note that the default value
3118 * is 4, and some implementations may restrict this setting so that it
3119 * can only be lowered.
3121 * NOTE: This text doesn't seem right. Do this on a socket basis with
3122 * future associations inheriting the socket value.
3124 static int sctp_setsockopt_maxburst(struct sock
*sk
,
3125 char __user
*optval
,
3126 unsigned int optlen
)
3128 struct sctp_assoc_value params
;
3129 struct sctp_sock
*sp
;
3130 struct sctp_association
*asoc
;
3134 if (optlen
== sizeof(int)) {
3136 "SCTP: Use of int in max_burst socket option deprecated\n");
3138 "SCTP: Use struct sctp_assoc_value instead\n");
3139 if (copy_from_user(&val
, optval
, optlen
))
3141 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3142 if (copy_from_user(¶ms
, optval
, optlen
))
3144 val
= params
.assoc_value
;
3145 assoc_id
= params
.assoc_id
;
3151 if (assoc_id
!= 0) {
3152 asoc
= sctp_id2assoc(sk
, assoc_id
);
3155 asoc
->max_burst
= val
;
3157 sp
->max_burst
= val
;
3163 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3165 * This set option adds a chunk type that the user is requesting to be
3166 * received only in an authenticated way. Changes to the list of chunks
3167 * will only effect future associations on the socket.
3169 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
3170 char __user
*optval
,
3171 unsigned int optlen
)
3173 struct sctp_authchunk val
;
3175 if (!sctp_auth_enable
)
3178 if (optlen
!= sizeof(struct sctp_authchunk
))
3180 if (copy_from_user(&val
, optval
, optlen
))
3183 switch (val
.sauth_chunk
) {
3185 case SCTP_CID_INIT_ACK
:
3186 case SCTP_CID_SHUTDOWN_COMPLETE
:
3191 /* add this chunk id to the endpoint */
3192 return sctp_auth_ep_add_chunkid(sctp_sk(sk
)->ep
, val
.sauth_chunk
);
3196 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3198 * This option gets or sets the list of HMAC algorithms that the local
3199 * endpoint requires the peer to use.
3201 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
3202 char __user
*optval
,
3203 unsigned int optlen
)
3205 struct sctp_hmacalgo
*hmacs
;
3209 if (!sctp_auth_enable
)
3212 if (optlen
< sizeof(struct sctp_hmacalgo
))
3215 hmacs
= kmalloc(optlen
, GFP_KERNEL
);
3219 if (copy_from_user(hmacs
, optval
, optlen
)) {
3224 idents
= hmacs
->shmac_num_idents
;
3225 if (idents
== 0 || idents
> SCTP_AUTH_NUM_HMACS
||
3226 (idents
* sizeof(u16
)) > (optlen
- sizeof(struct sctp_hmacalgo
))) {
3231 err
= sctp_auth_ep_set_hmacs(sctp_sk(sk
)->ep
, hmacs
);
3238 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3240 * This option will set a shared secret key which is used to build an
3241 * association shared key.
3243 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3244 char __user
*optval
,
3245 unsigned int optlen
)
3247 struct sctp_authkey
*authkey
;
3248 struct sctp_association
*asoc
;
3251 if (!sctp_auth_enable
)
3254 if (optlen
<= sizeof(struct sctp_authkey
))
3257 authkey
= kmalloc(optlen
, GFP_KERNEL
);
3261 if (copy_from_user(authkey
, optval
, optlen
)) {
3266 if (authkey
->sca_keylength
> optlen
- sizeof(struct sctp_authkey
)) {
3271 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3272 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3277 ret
= sctp_auth_set_key(sctp_sk(sk
)->ep
, asoc
, authkey
);
3284 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3286 * This option will get or set the active shared key to be used to build
3287 * the association shared key.
3289 static int sctp_setsockopt_active_key(struct sock
*sk
,
3290 char __user
*optval
,
3291 unsigned int optlen
)
3293 struct sctp_authkeyid val
;
3294 struct sctp_association
*asoc
;
3296 if (!sctp_auth_enable
)
3299 if (optlen
!= sizeof(struct sctp_authkeyid
))
3301 if (copy_from_user(&val
, optval
, optlen
))
3304 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3305 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3308 return sctp_auth_set_active_key(sctp_sk(sk
)->ep
, asoc
,
3309 val
.scact_keynumber
);
3313 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3315 * This set option will delete a shared secret key from use.
3317 static int sctp_setsockopt_del_key(struct sock
*sk
,
3318 char __user
*optval
,
3319 unsigned int optlen
)
3321 struct sctp_authkeyid val
;
3322 struct sctp_association
*asoc
;
3324 if (!sctp_auth_enable
)
3327 if (optlen
!= sizeof(struct sctp_authkeyid
))
3329 if (copy_from_user(&val
, optval
, optlen
))
3332 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3333 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3336 return sctp_auth_del_key_id(sctp_sk(sk
)->ep
, asoc
,
3337 val
.scact_keynumber
);
3342 /* API 6.2 setsockopt(), getsockopt()
3344 * Applications use setsockopt() and getsockopt() to set or retrieve
3345 * socket options. Socket options are used to change the default
3346 * behavior of sockets calls. They are described in Section 7.
3350 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3351 * int __user *optlen);
3352 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3355 * sd - the socket descript.
3356 * level - set to IPPROTO_SCTP for all SCTP options.
3357 * optname - the option name.
3358 * optval - the buffer to store the value of the option.
3359 * optlen - the size of the buffer.
3361 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3362 char __user
*optval
, unsigned int optlen
)
3366 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3369 /* I can hardly begin to describe how wrong this is. This is
3370 * so broken as to be worse than useless. The API draft
3371 * REALLY is NOT helpful here... I am not convinced that the
3372 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3373 * are at all well-founded.
3375 if (level
!= SOL_SCTP
) {
3376 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3377 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3384 case SCTP_SOCKOPT_BINDX_ADD
:
3385 /* 'optlen' is the size of the addresses buffer. */
3386 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3387 optlen
, SCTP_BINDX_ADD_ADDR
);
3390 case SCTP_SOCKOPT_BINDX_REM
:
3391 /* 'optlen' is the size of the addresses buffer. */
3392 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3393 optlen
, SCTP_BINDX_REM_ADDR
);
3396 case SCTP_SOCKOPT_CONNECTX_OLD
:
3397 /* 'optlen' is the size of the addresses buffer. */
3398 retval
= sctp_setsockopt_connectx_old(sk
,
3399 (struct sockaddr __user
*)optval
,
3403 case SCTP_SOCKOPT_CONNECTX
:
3404 /* 'optlen' is the size of the addresses buffer. */
3405 retval
= sctp_setsockopt_connectx(sk
,
3406 (struct sockaddr __user
*)optval
,
3410 case SCTP_DISABLE_FRAGMENTS
:
3411 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3415 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3418 case SCTP_AUTOCLOSE
:
3419 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3422 case SCTP_PEER_ADDR_PARAMS
:
3423 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3426 case SCTP_DELAYED_ACK
:
3427 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3429 case SCTP_PARTIAL_DELIVERY_POINT
:
3430 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3434 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3436 case SCTP_DEFAULT_SEND_PARAM
:
3437 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3440 case SCTP_PRIMARY_ADDR
:
3441 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3443 case SCTP_SET_PEER_PRIMARY_ADDR
:
3444 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3447 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3450 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3452 case SCTP_ASSOCINFO
:
3453 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3455 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3456 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3459 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3461 case SCTP_ADAPTATION_LAYER
:
3462 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3465 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3467 case SCTP_FRAGMENT_INTERLEAVE
:
3468 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3470 case SCTP_MAX_BURST
:
3471 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3473 case SCTP_AUTH_CHUNK
:
3474 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3476 case SCTP_HMAC_IDENT
:
3477 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3480 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3482 case SCTP_AUTH_ACTIVE_KEY
:
3483 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3485 case SCTP_AUTH_DELETE_KEY
:
3486 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3489 retval
= -ENOPROTOOPT
;
3493 sctp_release_sock(sk
);
3499 /* API 3.1.6 connect() - UDP Style Syntax
3501 * An application may use the connect() call in the UDP model to initiate an
3502 * association without sending data.
3506 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3508 * sd: the socket descriptor to have a new association added to.
3510 * nam: the address structure (either struct sockaddr_in or struct
3511 * sockaddr_in6 defined in RFC2553 [7]).
3513 * len: the size of the address.
3515 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3523 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3524 __func__
, sk
, addr
, addr_len
);
3526 /* Validate addr_len before calling common connect/connectx routine. */
3527 af
= sctp_get_af_specific(addr
->sa_family
);
3528 if (!af
|| addr_len
< af
->sockaddr_len
) {
3531 /* Pass correct addr len to common routine (so it knows there
3532 * is only one address being passed.
3534 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
3537 sctp_release_sock(sk
);
3541 /* FIXME: Write comments. */
3542 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
3544 return -EOPNOTSUPP
; /* STUB */
3547 /* 4.1.4 accept() - TCP Style Syntax
3549 * Applications use accept() call to remove an established SCTP
3550 * association from the accept queue of the endpoint. A new socket
3551 * descriptor will be returned from accept() to represent the newly
3552 * formed association.
3554 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3556 struct sctp_sock
*sp
;
3557 struct sctp_endpoint
*ep
;
3558 struct sock
*newsk
= NULL
;
3559 struct sctp_association
*asoc
;
3568 if (!sctp_style(sk
, TCP
)) {
3569 error
= -EOPNOTSUPP
;
3573 if (!sctp_sstate(sk
, LISTENING
)) {
3578 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3580 error
= sctp_wait_for_accept(sk
, timeo
);
3584 /* We treat the list of associations on the endpoint as the accept
3585 * queue and pick the first association on the list.
3587 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3589 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3595 /* Populate the fields of the newsk from the oldsk and migrate the
3596 * asoc to the newsk.
3598 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3601 sctp_release_sock(sk
);
3606 /* The SCTP ioctl handler. */
3607 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3609 return -ENOIOCTLCMD
;
3612 /* This is the function which gets called during socket creation to
3613 * initialized the SCTP-specific portion of the sock.
3614 * The sock structure should already be zero-filled memory.
3616 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
3618 struct sctp_endpoint
*ep
;
3619 struct sctp_sock
*sp
;
3621 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3625 /* Initialize the SCTP per socket area. */
3626 switch (sk
->sk_type
) {
3627 case SOCK_SEQPACKET
:
3628 sp
->type
= SCTP_SOCKET_UDP
;
3631 sp
->type
= SCTP_SOCKET_TCP
;
3634 return -ESOCKTNOSUPPORT
;
3637 /* Initialize default send parameters. These parameters can be
3638 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3640 sp
->default_stream
= 0;
3641 sp
->default_ppid
= 0;
3642 sp
->default_flags
= 0;
3643 sp
->default_context
= 0;
3644 sp
->default_timetolive
= 0;
3646 sp
->default_rcv_context
= 0;
3647 sp
->max_burst
= sctp_max_burst
;
3649 /* Initialize default setup parameters. These parameters
3650 * can be modified with the SCTP_INITMSG socket option or
3651 * overridden by the SCTP_INIT CMSG.
3653 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3654 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3655 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3656 sp
->initmsg
.sinit_max_init_timeo
= sctp_rto_max
;
3658 /* Initialize default RTO related parameters. These parameters can
3659 * be modified for with the SCTP_RTOINFO socket option.
3661 sp
->rtoinfo
.srto_initial
= sctp_rto_initial
;
3662 sp
->rtoinfo
.srto_max
= sctp_rto_max
;
3663 sp
->rtoinfo
.srto_min
= sctp_rto_min
;
3665 /* Initialize default association related parameters. These parameters
3666 * can be modified with the SCTP_ASSOCINFO socket option.
3668 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3669 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3670 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3671 sp
->assocparams
.sasoc_local_rwnd
= 0;
3672 sp
->assocparams
.sasoc_cookie_life
= sctp_valid_cookie_life
;
3674 /* Initialize default event subscriptions. By default, all the
3677 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3679 /* Default Peer Address Parameters. These defaults can
3680 * be modified via SCTP_PEER_ADDR_PARAMS
3682 sp
->hbinterval
= sctp_hb_interval
;
3683 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3684 sp
->pathmtu
= 0; // allow default discovery
3685 sp
->sackdelay
= sctp_sack_timeout
;
3687 sp
->param_flags
= SPP_HB_ENABLE
|
3689 SPP_SACKDELAY_ENABLE
;
3691 /* If enabled no SCTP message fragmentation will be performed.
3692 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3694 sp
->disable_fragments
= 0;
3696 /* Enable Nagle algorithm by default. */
3699 /* Enable by default. */
3702 /* Auto-close idle associations after the configured
3703 * number of seconds. A value of 0 disables this
3704 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3705 * for UDP-style sockets only.
3709 /* User specified fragmentation limit. */
3712 sp
->adaptation_ind
= 0;
3714 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3716 /* Control variables for partial data delivery. */
3717 atomic_set(&sp
->pd_mode
, 0);
3718 skb_queue_head_init(&sp
->pd_lobby
);
3719 sp
->frag_interleave
= 0;
3721 /* Create a per socket endpoint structure. Even if we
3722 * change the data structure relationships, this may still
3723 * be useful for storing pre-connect address information.
3725 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3732 SCTP_DBG_OBJCNT_INC(sock
);
3735 percpu_counter_inc(&sctp_sockets_allocated
);
3736 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, 1);
3742 /* Cleanup any SCTP per socket resources. */
3743 SCTP_STATIC
void sctp_destroy_sock(struct sock
*sk
)
3745 struct sctp_endpoint
*ep
;
3747 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3749 /* Release our hold on the endpoint. */
3750 ep
= sctp_sk(sk
)->ep
;
3751 sctp_endpoint_free(ep
);
3753 percpu_counter_dec(&sctp_sockets_allocated
);
3754 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
3758 /* API 4.1.7 shutdown() - TCP Style Syntax
3759 * int shutdown(int socket, int how);
3761 * sd - the socket descriptor of the association to be closed.
3762 * how - Specifies the type of shutdown. The values are
3765 * Disables further receive operations. No SCTP
3766 * protocol action is taken.
3768 * Disables further send operations, and initiates
3769 * the SCTP shutdown sequence.
3771 * Disables further send and receive operations
3772 * and initiates the SCTP shutdown sequence.
3774 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3776 struct sctp_endpoint
*ep
;
3777 struct sctp_association
*asoc
;
3779 if (!sctp_style(sk
, TCP
))
3782 if (how
& SEND_SHUTDOWN
) {
3783 ep
= sctp_sk(sk
)->ep
;
3784 if (!list_empty(&ep
->asocs
)) {
3785 asoc
= list_entry(ep
->asocs
.next
,
3786 struct sctp_association
, asocs
);
3787 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3792 /* 7.2.1 Association Status (SCTP_STATUS)
3794 * Applications can retrieve current status information about an
3795 * association, including association state, peer receiver window size,
3796 * number of unacked data chunks, and number of data chunks pending
3797 * receipt. This information is read-only.
3799 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3800 char __user
*optval
,
3803 struct sctp_status status
;
3804 struct sctp_association
*asoc
= NULL
;
3805 struct sctp_transport
*transport
;
3806 sctp_assoc_t associd
;
3809 if (len
< sizeof(status
)) {
3814 len
= sizeof(status
);
3815 if (copy_from_user(&status
, optval
, len
)) {
3820 associd
= status
.sstat_assoc_id
;
3821 asoc
= sctp_id2assoc(sk
, associd
);
3827 transport
= asoc
->peer
.primary_path
;
3829 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3830 status
.sstat_state
= asoc
->state
;
3831 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3832 status
.sstat_unackdata
= asoc
->unack_data
;
3834 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3835 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3836 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3837 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3838 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3839 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
3840 transport
->af_specific
->sockaddr_len
);
3841 /* Map ipv4 address into v4-mapped-on-v6 address. */
3842 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3843 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3844 status
.sstat_primary
.spinfo_state
= transport
->state
;
3845 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3846 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3847 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3848 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3850 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3851 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3853 if (put_user(len
, optlen
)) {
3858 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3859 len
, status
.sstat_state
, status
.sstat_rwnd
,
3860 status
.sstat_assoc_id
);
3862 if (copy_to_user(optval
, &status
, len
)) {
3872 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3874 * Applications can retrieve information about a specific peer address
3875 * of an association, including its reachability state, congestion
3876 * window, and retransmission timer values. This information is
3879 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3880 char __user
*optval
,
3883 struct sctp_paddrinfo pinfo
;
3884 struct sctp_transport
*transport
;
3887 if (len
< sizeof(pinfo
)) {
3892 len
= sizeof(pinfo
);
3893 if (copy_from_user(&pinfo
, optval
, len
)) {
3898 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3899 pinfo
.spinfo_assoc_id
);
3903 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3904 pinfo
.spinfo_state
= transport
->state
;
3905 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3906 pinfo
.spinfo_srtt
= transport
->srtt
;
3907 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3908 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3910 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3911 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3913 if (put_user(len
, optlen
)) {
3918 if (copy_to_user(optval
, &pinfo
, len
)) {
3927 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3929 * This option is a on/off flag. If enabled no SCTP message
3930 * fragmentation will be performed. Instead if a message being sent
3931 * exceeds the current PMTU size, the message will NOT be sent and
3932 * instead a error will be indicated to the user.
3934 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3935 char __user
*optval
, int __user
*optlen
)
3939 if (len
< sizeof(int))
3943 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3944 if (put_user(len
, optlen
))
3946 if (copy_to_user(optval
, &val
, len
))
3951 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3953 * This socket option is used to specify various notifications and
3954 * ancillary data the user wishes to receive.
3956 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
3959 if (len
< sizeof(struct sctp_event_subscribe
))
3961 len
= sizeof(struct sctp_event_subscribe
);
3962 if (put_user(len
, optlen
))
3964 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
3969 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3971 * This socket option is applicable to the UDP-style socket only. When
3972 * set it will cause associations that are idle for more than the
3973 * specified number of seconds to automatically close. An association
3974 * being idle is defined an association that has NOT sent or received
3975 * user data. The special value of '0' indicates that no automatic
3976 * close of any associations should be performed. The option expects an
3977 * integer defining the number of seconds of idle time before an
3978 * association is closed.
3980 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3982 /* Applicable to UDP-style socket only */
3983 if (sctp_style(sk
, TCP
))
3985 if (len
< sizeof(int))
3988 if (put_user(len
, optlen
))
3990 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
3995 /* Helper routine to branch off an association to a new socket. */
3996 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3997 struct socket
**sockp
)
3999 struct sock
*sk
= asoc
->base
.sk
;
4000 struct socket
*sock
;
4004 /* An association cannot be branched off from an already peeled-off
4005 * socket, nor is this supported for tcp style sockets.
4007 if (!sctp_style(sk
, UDP
))
4010 /* Create a new socket. */
4011 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
4015 sctp_copy_sock(sock
->sk
, sk
, asoc
);
4017 /* Make peeled-off sockets more like 1-1 accepted sockets.
4018 * Set the daddr and initialize id to something more random
4020 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
4021 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
4023 /* Populate the fields of the newsk from the oldsk and migrate the
4024 * asoc to the newsk.
4026 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
4033 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4035 sctp_peeloff_arg_t peeloff
;
4036 struct socket
*newsock
;
4038 struct sctp_association
*asoc
;
4040 if (len
< sizeof(sctp_peeloff_arg_t
))
4042 len
= sizeof(sctp_peeloff_arg_t
);
4043 if (copy_from_user(&peeloff
, optval
, len
))
4046 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
4052 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__
, sk
, asoc
);
4054 retval
= sctp_do_peeloff(asoc
, &newsock
);
4058 /* Map the socket to an unused fd that can be returned to the user. */
4059 retval
= sock_map_fd(newsock
, 0);
4061 sock_release(newsock
);
4065 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
4066 __func__
, sk
, asoc
, newsock
->sk
, retval
);
4068 /* Return the fd mapped to the new socket. */
4069 peeloff
.sd
= retval
;
4070 if (put_user(len
, optlen
))
4072 if (copy_to_user(optval
, &peeloff
, len
))
4079 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4081 * Applications can enable or disable heartbeats for any peer address of
4082 * an association, modify an address's heartbeat interval, force a
4083 * heartbeat to be sent immediately, and adjust the address's maximum
4084 * number of retransmissions sent before an address is considered
4085 * unreachable. The following structure is used to access and modify an
4086 * address's parameters:
4088 * struct sctp_paddrparams {
4089 * sctp_assoc_t spp_assoc_id;
4090 * struct sockaddr_storage spp_address;
4091 * uint32_t spp_hbinterval;
4092 * uint16_t spp_pathmaxrxt;
4093 * uint32_t spp_pathmtu;
4094 * uint32_t spp_sackdelay;
4095 * uint32_t spp_flags;
4098 * spp_assoc_id - (one-to-many style socket) This is filled in the
4099 * application, and identifies the association for
4101 * spp_address - This specifies which address is of interest.
4102 * spp_hbinterval - This contains the value of the heartbeat interval,
4103 * in milliseconds. If a value of zero
4104 * is present in this field then no changes are to
4105 * be made to this parameter.
4106 * spp_pathmaxrxt - This contains the maximum number of
4107 * retransmissions before this address shall be
4108 * considered unreachable. If a value of zero
4109 * is present in this field then no changes are to
4110 * be made to this parameter.
4111 * spp_pathmtu - When Path MTU discovery is disabled the value
4112 * specified here will be the "fixed" path mtu.
4113 * Note that if the spp_address field is empty
4114 * then all associations on this address will
4115 * have this fixed path mtu set upon them.
4117 * spp_sackdelay - When delayed sack is enabled, this value specifies
4118 * the number of milliseconds that sacks will be delayed
4119 * for. This value will apply to all addresses of an
4120 * association if the spp_address field is empty. Note
4121 * also, that if delayed sack is enabled and this
4122 * value is set to 0, no change is made to the last
4123 * recorded delayed sack timer value.
4125 * spp_flags - These flags are used to control various features
4126 * on an association. The flag field may contain
4127 * zero or more of the following options.
4129 * SPP_HB_ENABLE - Enable heartbeats on the
4130 * specified address. Note that if the address
4131 * field is empty all addresses for the association
4132 * have heartbeats enabled upon them.
4134 * SPP_HB_DISABLE - Disable heartbeats on the
4135 * speicifed address. Note that if the address
4136 * field is empty all addresses for the association
4137 * will have their heartbeats disabled. Note also
4138 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4139 * mutually exclusive, only one of these two should
4140 * be specified. Enabling both fields will have
4141 * undetermined results.
4143 * SPP_HB_DEMAND - Request a user initiated heartbeat
4144 * to be made immediately.
4146 * SPP_PMTUD_ENABLE - This field will enable PMTU
4147 * discovery upon the specified address. Note that
4148 * if the address feild is empty then all addresses
4149 * on the association are effected.
4151 * SPP_PMTUD_DISABLE - This field will disable PMTU
4152 * discovery upon the specified address. Note that
4153 * if the address feild is empty then all addresses
4154 * on the association are effected. Not also that
4155 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4156 * exclusive. Enabling both will have undetermined
4159 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4160 * on delayed sack. The time specified in spp_sackdelay
4161 * is used to specify the sack delay for this address. Note
4162 * that if spp_address is empty then all addresses will
4163 * enable delayed sack and take on the sack delay
4164 * value specified in spp_sackdelay.
4165 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4166 * off delayed sack. If the spp_address field is blank then
4167 * delayed sack is disabled for the entire association. Note
4168 * also that this field is mutually exclusive to
4169 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4172 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
4173 char __user
*optval
, int __user
*optlen
)
4175 struct sctp_paddrparams params
;
4176 struct sctp_transport
*trans
= NULL
;
4177 struct sctp_association
*asoc
= NULL
;
4178 struct sctp_sock
*sp
= sctp_sk(sk
);
4180 if (len
< sizeof(struct sctp_paddrparams
))
4182 len
= sizeof(struct sctp_paddrparams
);
4183 if (copy_from_user(¶ms
, optval
, len
))
4186 /* If an address other than INADDR_ANY is specified, and
4187 * no transport is found, then the request is invalid.
4189 if (!sctp_is_any(sk
, ( union sctp_addr
*)¶ms
.spp_address
)) {
4190 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
4191 params
.spp_assoc_id
);
4193 SCTP_DEBUG_PRINTK("Failed no transport\n");
4198 /* Get association, if assoc_id != 0 and the socket is a one
4199 * to many style socket, and an association was not found, then
4200 * the id was invalid.
4202 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
4203 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
4204 SCTP_DEBUG_PRINTK("Failed no association\n");
4209 /* Fetch transport values. */
4210 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
4211 params
.spp_pathmtu
= trans
->pathmtu
;
4212 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
4213 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
4215 /*draft-11 doesn't say what to return in spp_flags*/
4216 params
.spp_flags
= trans
->param_flags
;
4218 /* Fetch association values. */
4219 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
4220 params
.spp_pathmtu
= asoc
->pathmtu
;
4221 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
4222 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
4224 /*draft-11 doesn't say what to return in spp_flags*/
4225 params
.spp_flags
= asoc
->param_flags
;
4227 /* Fetch socket values. */
4228 params
.spp_hbinterval
= sp
->hbinterval
;
4229 params
.spp_pathmtu
= sp
->pathmtu
;
4230 params
.spp_sackdelay
= sp
->sackdelay
;
4231 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
4233 /*draft-11 doesn't say what to return in spp_flags*/
4234 params
.spp_flags
= sp
->param_flags
;
4237 if (copy_to_user(optval
, ¶ms
, len
))
4240 if (put_user(len
, optlen
))
4247 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4249 * This option will effect the way delayed acks are performed. This
4250 * option allows you to get or set the delayed ack time, in
4251 * milliseconds. It also allows changing the delayed ack frequency.
4252 * Changing the frequency to 1 disables the delayed sack algorithm. If
4253 * the assoc_id is 0, then this sets or gets the endpoints default
4254 * values. If the assoc_id field is non-zero, then the set or get
4255 * effects the specified association for the one to many model (the
4256 * assoc_id field is ignored by the one to one model). Note that if
4257 * sack_delay or sack_freq are 0 when setting this option, then the
4258 * current values will remain unchanged.
4260 * struct sctp_sack_info {
4261 * sctp_assoc_t sack_assoc_id;
4262 * uint32_t sack_delay;
4263 * uint32_t sack_freq;
4266 * sack_assoc_id - This parameter, indicates which association the user
4267 * is performing an action upon. Note that if this field's value is
4268 * zero then the endpoints default value is changed (effecting future
4269 * associations only).
4271 * sack_delay - This parameter contains the number of milliseconds that
4272 * the user is requesting the delayed ACK timer be set to. Note that
4273 * this value is defined in the standard to be between 200 and 500
4276 * sack_freq - This parameter contains the number of packets that must
4277 * be received before a sack is sent without waiting for the delay
4278 * timer to expire. The default value for this is 2, setting this
4279 * value to 1 will disable the delayed sack algorithm.
4281 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
4282 char __user
*optval
,
4285 struct sctp_sack_info params
;
4286 struct sctp_association
*asoc
= NULL
;
4287 struct sctp_sock
*sp
= sctp_sk(sk
);
4289 if (len
>= sizeof(struct sctp_sack_info
)) {
4290 len
= sizeof(struct sctp_sack_info
);
4292 if (copy_from_user(¶ms
, optval
, len
))
4294 } else if (len
== sizeof(struct sctp_assoc_value
)) {
4295 printk(KERN_WARNING
"SCTP: Use of struct sctp_assoc_value "
4296 "in delayed_ack socket option deprecated\n");
4297 printk(KERN_WARNING
"SCTP: Use struct sctp_sack_info instead\n");
4298 if (copy_from_user(¶ms
, optval
, len
))
4303 /* Get association, if sack_assoc_id != 0 and the socket is a one
4304 * to many style socket, and an association was not found, then
4305 * the id was invalid.
4307 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
4308 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
4312 /* Fetch association values. */
4313 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4314 params
.sack_delay
= jiffies_to_msecs(
4316 params
.sack_freq
= asoc
->sackfreq
;
4319 params
.sack_delay
= 0;
4320 params
.sack_freq
= 1;
4323 /* Fetch socket values. */
4324 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4325 params
.sack_delay
= sp
->sackdelay
;
4326 params
.sack_freq
= sp
->sackfreq
;
4328 params
.sack_delay
= 0;
4329 params
.sack_freq
= 1;
4333 if (copy_to_user(optval
, ¶ms
, len
))
4336 if (put_user(len
, optlen
))
4342 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4344 * Applications can specify protocol parameters for the default association
4345 * initialization. The option name argument to setsockopt() and getsockopt()
4348 * Setting initialization parameters is effective only on an unconnected
4349 * socket (for UDP-style sockets only future associations are effected
4350 * by the change). With TCP-style sockets, this option is inherited by
4351 * sockets derived from a listener socket.
4353 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4355 if (len
< sizeof(struct sctp_initmsg
))
4357 len
= sizeof(struct sctp_initmsg
);
4358 if (put_user(len
, optlen
))
4360 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
4366 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4367 char __user
*optval
, int __user
*optlen
)
4369 struct sctp_association
*asoc
;
4371 struct sctp_getaddrs getaddrs
;
4372 struct sctp_transport
*from
;
4374 union sctp_addr temp
;
4375 struct sctp_sock
*sp
= sctp_sk(sk
);
4380 if (len
< sizeof(struct sctp_getaddrs
))
4383 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4386 /* For UDP-style sockets, id specifies the association to query. */
4387 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4391 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4392 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4394 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
4396 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4397 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4398 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4399 if (space_left
< addrlen
)
4401 if (copy_to_user(to
, &temp
, addrlen
))
4405 space_left
-= addrlen
;
4408 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4410 bytes_copied
= ((char __user
*)to
) - optval
;
4411 if (put_user(bytes_copied
, optlen
))
4417 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4418 size_t space_left
, int *bytes_copied
)
4420 struct sctp_sockaddr_entry
*addr
;
4421 union sctp_addr temp
;
4426 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
4430 if ((PF_INET
== sk
->sk_family
) &&
4431 (AF_INET6
== addr
->a
.sa
.sa_family
))
4433 if ((PF_INET6
== sk
->sk_family
) &&
4434 inet_v6_ipv6only(sk
) &&
4435 (AF_INET
== addr
->a
.sa
.sa_family
))
4437 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4438 if (!temp
.v4
.sin_port
)
4439 temp
.v4
.sin_port
= htons(port
);
4441 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4443 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4444 if (space_left
< addrlen
) {
4448 memcpy(to
, &temp
, addrlen
);
4452 space_left
-= addrlen
;
4453 *bytes_copied
+= addrlen
;
4461 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4462 char __user
*optval
, int __user
*optlen
)
4464 struct sctp_bind_addr
*bp
;
4465 struct sctp_association
*asoc
;
4467 struct sctp_getaddrs getaddrs
;
4468 struct sctp_sockaddr_entry
*addr
;
4470 union sctp_addr temp
;
4471 struct sctp_sock
*sp
= sctp_sk(sk
);
4475 int bytes_copied
= 0;
4479 if (len
< sizeof(struct sctp_getaddrs
))
4482 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4486 * For UDP-style sockets, id specifies the association to query.
4487 * If the id field is set to the value '0' then the locally bound
4488 * addresses are returned without regard to any particular
4491 if (0 == getaddrs
.assoc_id
) {
4492 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4494 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4497 bp
= &asoc
->base
.bind_addr
;
4500 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4501 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4503 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4507 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4508 * addresses from the global local address list.
4510 if (sctp_list_single_entry(&bp
->address_list
)) {
4511 addr
= list_entry(bp
->address_list
.next
,
4512 struct sctp_sockaddr_entry
, list
);
4513 if (sctp_is_any(sk
, &addr
->a
)) {
4514 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4515 space_left
, &bytes_copied
);
4525 /* Protection on the bound address list is not needed since
4526 * in the socket option context we hold a socket lock and
4527 * thus the bound address list can't change.
4529 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4530 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4531 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4532 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4533 if (space_left
< addrlen
) {
4534 err
= -ENOMEM
; /*fixme: right error?*/
4537 memcpy(buf
, &temp
, addrlen
);
4539 bytes_copied
+= addrlen
;
4541 space_left
-= addrlen
;
4545 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4549 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4553 if (put_user(bytes_copied
, optlen
))
4560 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4562 * Requests that the local SCTP stack use the enclosed peer address as
4563 * the association primary. The enclosed address must be one of the
4564 * association peer's addresses.
4566 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4567 char __user
*optval
, int __user
*optlen
)
4569 struct sctp_prim prim
;
4570 struct sctp_association
*asoc
;
4571 struct sctp_sock
*sp
= sctp_sk(sk
);
4573 if (len
< sizeof(struct sctp_prim
))
4576 len
= sizeof(struct sctp_prim
);
4578 if (copy_from_user(&prim
, optval
, len
))
4581 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4585 if (!asoc
->peer
.primary_path
)
4588 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4589 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4591 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4592 (union sctp_addr
*)&prim
.ssp_addr
);
4594 if (put_user(len
, optlen
))
4596 if (copy_to_user(optval
, &prim
, len
))
4603 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4605 * Requests that the local endpoint set the specified Adaptation Layer
4606 * Indication parameter for all future INIT and INIT-ACK exchanges.
4608 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4609 char __user
*optval
, int __user
*optlen
)
4611 struct sctp_setadaptation adaptation
;
4613 if (len
< sizeof(struct sctp_setadaptation
))
4616 len
= sizeof(struct sctp_setadaptation
);
4618 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4620 if (put_user(len
, optlen
))
4622 if (copy_to_user(optval
, &adaptation
, len
))
4630 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4632 * Applications that wish to use the sendto() system call may wish to
4633 * specify a default set of parameters that would normally be supplied
4634 * through the inclusion of ancillary data. This socket option allows
4635 * such an application to set the default sctp_sndrcvinfo structure.
4638 * The application that wishes to use this socket option simply passes
4639 * in to this call the sctp_sndrcvinfo structure defined in Section
4640 * 5.2.2) The input parameters accepted by this call include
4641 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4642 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4643 * to this call if the caller is using the UDP model.
4645 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4647 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4648 int len
, char __user
*optval
,
4651 struct sctp_sndrcvinfo info
;
4652 struct sctp_association
*asoc
;
4653 struct sctp_sock
*sp
= sctp_sk(sk
);
4655 if (len
< sizeof(struct sctp_sndrcvinfo
))
4658 len
= sizeof(struct sctp_sndrcvinfo
);
4660 if (copy_from_user(&info
, optval
, len
))
4663 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4664 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4668 info
.sinfo_stream
= asoc
->default_stream
;
4669 info
.sinfo_flags
= asoc
->default_flags
;
4670 info
.sinfo_ppid
= asoc
->default_ppid
;
4671 info
.sinfo_context
= asoc
->default_context
;
4672 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4674 info
.sinfo_stream
= sp
->default_stream
;
4675 info
.sinfo_flags
= sp
->default_flags
;
4676 info
.sinfo_ppid
= sp
->default_ppid
;
4677 info
.sinfo_context
= sp
->default_context
;
4678 info
.sinfo_timetolive
= sp
->default_timetolive
;
4681 if (put_user(len
, optlen
))
4683 if (copy_to_user(optval
, &info
, len
))
4691 * 7.1.5 SCTP_NODELAY
4693 * Turn on/off any Nagle-like algorithm. This means that packets are
4694 * generally sent as soon as possible and no unnecessary delays are
4695 * introduced, at the cost of more packets in the network. Expects an
4696 * integer boolean flag.
4699 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4700 char __user
*optval
, int __user
*optlen
)
4704 if (len
< sizeof(int))
4708 val
= (sctp_sk(sk
)->nodelay
== 1);
4709 if (put_user(len
, optlen
))
4711 if (copy_to_user(optval
, &val
, len
))
4718 * 7.1.1 SCTP_RTOINFO
4720 * The protocol parameters used to initialize and bound retransmission
4721 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4722 * and modify these parameters.
4723 * All parameters are time values, in milliseconds. A value of 0, when
4724 * modifying the parameters, indicates that the current value should not
4728 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4729 char __user
*optval
,
4730 int __user
*optlen
) {
4731 struct sctp_rtoinfo rtoinfo
;
4732 struct sctp_association
*asoc
;
4734 if (len
< sizeof (struct sctp_rtoinfo
))
4737 len
= sizeof(struct sctp_rtoinfo
);
4739 if (copy_from_user(&rtoinfo
, optval
, len
))
4742 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4744 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4747 /* Values corresponding to the specific association. */
4749 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4750 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4751 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4753 /* Values corresponding to the endpoint. */
4754 struct sctp_sock
*sp
= sctp_sk(sk
);
4756 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4757 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4758 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4761 if (put_user(len
, optlen
))
4764 if (copy_to_user(optval
, &rtoinfo
, len
))
4772 * 7.1.2 SCTP_ASSOCINFO
4774 * This option is used to tune the maximum retransmission attempts
4775 * of the association.
4776 * Returns an error if the new association retransmission value is
4777 * greater than the sum of the retransmission value of the peer.
4778 * See [SCTP] for more information.
4781 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4782 char __user
*optval
,
4786 struct sctp_assocparams assocparams
;
4787 struct sctp_association
*asoc
;
4788 struct list_head
*pos
;
4791 if (len
< sizeof (struct sctp_assocparams
))
4794 len
= sizeof(struct sctp_assocparams
);
4796 if (copy_from_user(&assocparams
, optval
, len
))
4799 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4801 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4804 /* Values correspoinding to the specific association */
4806 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4807 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4808 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4809 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4811 (asoc
->cookie_life
.tv_usec
4814 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4818 assocparams
.sasoc_number_peer_destinations
= cnt
;
4820 /* Values corresponding to the endpoint */
4821 struct sctp_sock
*sp
= sctp_sk(sk
);
4823 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4824 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4825 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4826 assocparams
.sasoc_cookie_life
=
4827 sp
->assocparams
.sasoc_cookie_life
;
4828 assocparams
.sasoc_number_peer_destinations
=
4830 sasoc_number_peer_destinations
;
4833 if (put_user(len
, optlen
))
4836 if (copy_to_user(optval
, &assocparams
, len
))
4843 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4845 * This socket option is a boolean flag which turns on or off mapped V4
4846 * addresses. If this option is turned on and the socket is type
4847 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4848 * If this option is turned off, then no mapping will be done of V4
4849 * addresses and a user will receive both PF_INET6 and PF_INET type
4850 * addresses on the socket.
4852 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
4853 char __user
*optval
, int __user
*optlen
)
4856 struct sctp_sock
*sp
= sctp_sk(sk
);
4858 if (len
< sizeof(int))
4863 if (put_user(len
, optlen
))
4865 if (copy_to_user(optval
, &val
, len
))
4872 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
4873 * (chapter and verse is quoted at sctp_setsockopt_context())
4875 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
4876 char __user
*optval
, int __user
*optlen
)
4878 struct sctp_assoc_value params
;
4879 struct sctp_sock
*sp
;
4880 struct sctp_association
*asoc
;
4882 if (len
< sizeof(struct sctp_assoc_value
))
4885 len
= sizeof(struct sctp_assoc_value
);
4887 if (copy_from_user(¶ms
, optval
, len
))
4892 if (params
.assoc_id
!= 0) {
4893 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4896 params
.assoc_value
= asoc
->default_rcv_context
;
4898 params
.assoc_value
= sp
->default_rcv_context
;
4901 if (put_user(len
, optlen
))
4903 if (copy_to_user(optval
, ¶ms
, len
))
4910 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
4911 * This option will get or set the maximum size to put in any outgoing
4912 * SCTP DATA chunk. If a message is larger than this size it will be
4913 * fragmented by SCTP into the specified size. Note that the underlying
4914 * SCTP implementation may fragment into smaller sized chunks when the
4915 * PMTU of the underlying association is smaller than the value set by
4916 * the user. The default value for this option is '0' which indicates
4917 * the user is NOT limiting fragmentation and only the PMTU will effect
4918 * SCTP's choice of DATA chunk size. Note also that values set larger
4919 * than the maximum size of an IP datagram will effectively let SCTP
4920 * control fragmentation (i.e. the same as setting this option to 0).
4922 * The following structure is used to access and modify this parameter:
4924 * struct sctp_assoc_value {
4925 * sctp_assoc_t assoc_id;
4926 * uint32_t assoc_value;
4929 * assoc_id: This parameter is ignored for one-to-one style sockets.
4930 * For one-to-many style sockets this parameter indicates which
4931 * association the user is performing an action upon. Note that if
4932 * this field's value is zero then the endpoints default value is
4933 * changed (effecting future associations only).
4934 * assoc_value: This parameter specifies the maximum size in bytes.
4936 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
4937 char __user
*optval
, int __user
*optlen
)
4939 struct sctp_assoc_value params
;
4940 struct sctp_association
*asoc
;
4942 if (len
== sizeof(int)) {
4944 "SCTP: Use of int in maxseg socket option deprecated\n");
4946 "SCTP: Use struct sctp_assoc_value instead\n");
4947 params
.assoc_id
= 0;
4948 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
4949 len
= sizeof(struct sctp_assoc_value
);
4950 if (copy_from_user(¶ms
, optval
, sizeof(params
)))
4955 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4956 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
4960 params
.assoc_value
= asoc
->frag_point
;
4962 params
.assoc_value
= sctp_sk(sk
)->user_frag
;
4964 if (put_user(len
, optlen
))
4966 if (len
== sizeof(int)) {
4967 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
4970 if (copy_to_user(optval
, ¶ms
, len
))
4978 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
4979 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
4981 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
4982 char __user
*optval
, int __user
*optlen
)
4986 if (len
< sizeof(int))
4991 val
= sctp_sk(sk
)->frag_interleave
;
4992 if (put_user(len
, optlen
))
4994 if (copy_to_user(optval
, &val
, len
))
5001 * 7.1.25. Set or Get the sctp partial delivery point
5002 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5004 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
5005 char __user
*optval
,
5010 if (len
< sizeof(u32
))
5015 val
= sctp_sk(sk
)->pd_point
;
5016 if (put_user(len
, optlen
))
5018 if (copy_to_user(optval
, &val
, len
))
5025 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5026 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5028 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5029 char __user
*optval
,
5032 struct sctp_assoc_value params
;
5033 struct sctp_sock
*sp
;
5034 struct sctp_association
*asoc
;
5036 if (len
== sizeof(int)) {
5038 "SCTP: Use of int in max_burst socket option deprecated\n");
5040 "SCTP: Use struct sctp_assoc_value instead\n");
5041 params
.assoc_id
= 0;
5042 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5043 len
= sizeof(struct sctp_assoc_value
);
5044 if (copy_from_user(¶ms
, optval
, len
))
5051 if (params
.assoc_id
!= 0) {
5052 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5055 params
.assoc_value
= asoc
->max_burst
;
5057 params
.assoc_value
= sp
->max_burst
;
5059 if (len
== sizeof(int)) {
5060 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5063 if (copy_to_user(optval
, ¶ms
, len
))
5071 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5072 char __user
*optval
, int __user
*optlen
)
5074 struct sctp_hmacalgo __user
*p
= (void __user
*)optval
;
5075 struct sctp_hmac_algo_param
*hmacs
;
5079 if (!sctp_auth_enable
)
5082 hmacs
= sctp_sk(sk
)->ep
->auth_hmacs_list
;
5083 data_len
= ntohs(hmacs
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5085 if (len
< sizeof(struct sctp_hmacalgo
) + data_len
)
5088 len
= sizeof(struct sctp_hmacalgo
) + data_len
;
5089 num_idents
= data_len
/ sizeof(u16
);
5091 if (put_user(len
, optlen
))
5093 if (put_user(num_idents
, &p
->shmac_num_idents
))
5095 if (copy_to_user(p
->shmac_idents
, hmacs
->hmac_ids
, data_len
))
5100 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5101 char __user
*optval
, int __user
*optlen
)
5103 struct sctp_authkeyid val
;
5104 struct sctp_association
*asoc
;
5106 if (!sctp_auth_enable
)
5109 if (len
< sizeof(struct sctp_authkeyid
))
5111 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5114 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5115 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5119 val
.scact_keynumber
= asoc
->active_key_id
;
5121 val
.scact_keynumber
= sctp_sk(sk
)->ep
->active_key_id
;
5123 len
= sizeof(struct sctp_authkeyid
);
5124 if (put_user(len
, optlen
))
5126 if (copy_to_user(optval
, &val
, len
))
5132 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5133 char __user
*optval
, int __user
*optlen
)
5135 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5136 struct sctp_authchunks val
;
5137 struct sctp_association
*asoc
;
5138 struct sctp_chunks_param
*ch
;
5142 if (!sctp_auth_enable
)
5145 if (len
< sizeof(struct sctp_authchunks
))
5148 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
5151 to
= p
->gauth_chunks
;
5152 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5156 ch
= asoc
->peer
.peer_chunks
;
5160 /* See if the user provided enough room for all the data */
5161 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5162 if (len
< num_chunks
)
5165 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
5168 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
5169 if (put_user(len
, optlen
)) return -EFAULT
;
5170 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5175 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
5176 char __user
*optval
, int __user
*optlen
)
5178 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5179 struct sctp_authchunks val
;
5180 struct sctp_association
*asoc
;
5181 struct sctp_chunks_param
*ch
;
5185 if (!sctp_auth_enable
)
5188 if (len
< sizeof(struct sctp_authchunks
))
5191 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
5194 to
= p
->gauth_chunks
;
5195 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5196 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
5200 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
5202 ch
= sctp_sk(sk
)->ep
->auth_chunk_list
;
5207 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5208 if (len
< sizeof(struct sctp_authchunks
) + num_chunks
)
5211 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
5214 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
5215 if (put_user(len
, optlen
))
5217 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5224 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5225 * This option gets the current number of associations that are attached
5226 * to a one-to-many style socket. The option value is an uint32_t.
5228 static int sctp_getsockopt_assoc_number(struct sock
*sk
, int len
,
5229 char __user
*optval
, int __user
*optlen
)
5231 struct sctp_sock
*sp
= sctp_sk(sk
);
5232 struct sctp_association
*asoc
;
5235 if (sctp_style(sk
, TCP
))
5238 if (len
< sizeof(u32
))
5243 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5247 if (put_user(len
, optlen
))
5249 if (copy_to_user(optval
, &val
, len
))
5255 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
5256 char __user
*optval
, int __user
*optlen
)
5261 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5264 /* I can hardly begin to describe how wrong this is. This is
5265 * so broken as to be worse than useless. The API draft
5266 * REALLY is NOT helpful here... I am not convinced that the
5267 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5268 * are at all well-founded.
5270 if (level
!= SOL_SCTP
) {
5271 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5273 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
5277 if (get_user(len
, optlen
))
5284 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
5286 case SCTP_DISABLE_FRAGMENTS
:
5287 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
5291 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
5293 case SCTP_AUTOCLOSE
:
5294 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
5296 case SCTP_SOCKOPT_PEELOFF
:
5297 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
5299 case SCTP_PEER_ADDR_PARAMS
:
5300 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
5303 case SCTP_DELAYED_ACK
:
5304 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
5308 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
5310 case SCTP_GET_PEER_ADDRS
:
5311 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
5314 case SCTP_GET_LOCAL_ADDRS
:
5315 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
5318 case SCTP_SOCKOPT_CONNECTX3
:
5319 retval
= sctp_getsockopt_connectx3(sk
, len
, optval
, optlen
);
5321 case SCTP_DEFAULT_SEND_PARAM
:
5322 retval
= sctp_getsockopt_default_send_param(sk
, len
,
5325 case SCTP_PRIMARY_ADDR
:
5326 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
5329 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
5332 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
5334 case SCTP_ASSOCINFO
:
5335 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
5337 case SCTP_I_WANT_MAPPED_V4_ADDR
:
5338 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
5341 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
5343 case SCTP_GET_PEER_ADDR_INFO
:
5344 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
5347 case SCTP_ADAPTATION_LAYER
:
5348 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
5352 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
5354 case SCTP_FRAGMENT_INTERLEAVE
:
5355 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
5358 case SCTP_PARTIAL_DELIVERY_POINT
:
5359 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
5362 case SCTP_MAX_BURST
:
5363 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
5366 case SCTP_AUTH_CHUNK
:
5367 case SCTP_AUTH_DELETE_KEY
:
5368 retval
= -EOPNOTSUPP
;
5370 case SCTP_HMAC_IDENT
:
5371 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
5373 case SCTP_AUTH_ACTIVE_KEY
:
5374 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
5376 case SCTP_PEER_AUTH_CHUNKS
:
5377 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
5380 case SCTP_LOCAL_AUTH_CHUNKS
:
5381 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
5384 case SCTP_GET_ASSOC_NUMBER
:
5385 retval
= sctp_getsockopt_assoc_number(sk
, len
, optval
, optlen
);
5388 retval
= -ENOPROTOOPT
;
5392 sctp_release_sock(sk
);
5396 static void sctp_hash(struct sock
*sk
)
5401 static void sctp_unhash(struct sock
*sk
)
5406 /* Check if port is acceptable. Possibly find first available port.
5408 * The port hash table (contained in the 'global' SCTP protocol storage
5409 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5410 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5411 * list (the list number is the port number hashed out, so as you
5412 * would expect from a hash function, all the ports in a given list have
5413 * such a number that hashes out to the same list number; you were
5414 * expecting that, right?); so each list has a set of ports, with a
5415 * link to the socket (struct sock) that uses it, the port number and
5416 * a fastreuse flag (FIXME: NPI ipg).
5418 static struct sctp_bind_bucket
*sctp_bucket_create(
5419 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
5421 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
5423 struct sctp_bind_hashbucket
*head
; /* hash list */
5424 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5425 struct hlist_node
*node
;
5426 unsigned short snum
;
5429 snum
= ntohs(addr
->v4
.sin_port
);
5431 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
5432 sctp_local_bh_disable();
5435 /* Search for an available port. */
5436 int low
, high
, remaining
, index
;
5439 inet_get_local_port_range(&low
, &high
);
5440 remaining
= (high
- low
) + 1;
5441 rover
= net_random() % remaining
+ low
;
5445 if ((rover
< low
) || (rover
> high
))
5447 if (inet_is_reserved_local_port(rover
))
5449 index
= sctp_phashfn(rover
);
5450 head
= &sctp_port_hashtable
[index
];
5451 sctp_spin_lock(&head
->lock
);
5452 sctp_for_each_hentry(pp
, node
, &head
->chain
)
5453 if (pp
->port
== rover
)
5457 sctp_spin_unlock(&head
->lock
);
5458 } while (--remaining
> 0);
5460 /* Exhausted local port range during search? */
5465 /* OK, here is the one we will use. HEAD (the port
5466 * hash table list entry) is non-NULL and we hold it's
5471 /* We are given an specific port number; we verify
5472 * that it is not being used. If it is used, we will
5473 * exahust the search in the hash list corresponding
5474 * to the port number (snum) - we detect that with the
5475 * port iterator, pp being NULL.
5477 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
5478 sctp_spin_lock(&head
->lock
);
5479 sctp_for_each_hentry(pp
, node
, &head
->chain
) {
5480 if (pp
->port
== snum
)
5487 if (!hlist_empty(&pp
->owner
)) {
5488 /* We had a port hash table hit - there is an
5489 * available port (pp != NULL) and it is being
5490 * used by other socket (pp->owner not empty); that other
5491 * socket is going to be sk2.
5493 int reuse
= sk
->sk_reuse
;
5496 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5497 if (pp
->fastreuse
&& sk
->sk_reuse
&&
5498 sk
->sk_state
!= SCTP_SS_LISTENING
)
5501 /* Run through the list of sockets bound to the port
5502 * (pp->port) [via the pointers bind_next and
5503 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5504 * we get the endpoint they describe and run through
5505 * the endpoint's list of IP (v4 or v6) addresses,
5506 * comparing each of the addresses with the address of
5507 * the socket sk. If we find a match, then that means
5508 * that this port/socket (sk) combination are already
5511 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
5512 struct sctp_endpoint
*ep2
;
5513 ep2
= sctp_sk(sk2
)->ep
;
5516 (reuse
&& sk2
->sk_reuse
&&
5517 sk2
->sk_state
!= SCTP_SS_LISTENING
))
5520 if (sctp_bind_addr_conflict(&ep2
->base
.bind_addr
, addr
,
5521 sctp_sk(sk2
), sctp_sk(sk
))) {
5526 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5529 /* If there was a hash table miss, create a new port. */
5531 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
5534 /* In either case (hit or miss), make sure fastreuse is 1 only
5535 * if sk->sk_reuse is too (that is, if the caller requested
5536 * SO_REUSEADDR on this socket -sk-).
5538 if (hlist_empty(&pp
->owner
)) {
5539 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
5543 } else if (pp
->fastreuse
&&
5544 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
5547 /* We are set, so fill up all the data in the hash table
5548 * entry, tie the socket list information with the rest of the
5549 * sockets FIXME: Blurry, NPI (ipg).
5552 if (!sctp_sk(sk
)->bind_hash
) {
5553 inet_sk(sk
)->inet_num
= snum
;
5554 sk_add_bind_node(sk
, &pp
->owner
);
5555 sctp_sk(sk
)->bind_hash
= pp
;
5560 sctp_spin_unlock(&head
->lock
);
5563 sctp_local_bh_enable();
5567 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5568 * port is requested.
5570 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
5573 union sctp_addr addr
;
5574 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5576 /* Set up a dummy address struct from the sk. */
5577 af
->from_sk(&addr
, sk
);
5578 addr
.v4
.sin_port
= htons(snum
);
5580 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5581 ret
= sctp_get_port_local(sk
, &addr
);
5583 return (ret
? 1 : 0);
5587 * Move a socket to LISTENING state.
5589 SCTP_STATIC
int sctp_listen_start(struct sock
*sk
, int backlog
)
5591 struct sctp_sock
*sp
= sctp_sk(sk
);
5592 struct sctp_endpoint
*ep
= sp
->ep
;
5593 struct crypto_hash
*tfm
= NULL
;
5595 /* Allocate HMAC for generating cookie. */
5596 if (!sctp_sk(sk
)->hmac
&& sctp_hmac_alg
) {
5597 tfm
= crypto_alloc_hash(sctp_hmac_alg
, 0, CRYPTO_ALG_ASYNC
);
5599 if (net_ratelimit()) {
5601 "SCTP: failed to load transform for %s: %ld\n",
5602 sctp_hmac_alg
, PTR_ERR(tfm
));
5606 sctp_sk(sk
)->hmac
= tfm
;
5610 * If a bind() or sctp_bindx() is not called prior to a listen()
5611 * call that allows new associations to be accepted, the system
5612 * picks an ephemeral port and will choose an address set equivalent
5613 * to binding with a wildcard address.
5615 * This is not currently spelled out in the SCTP sockets
5616 * extensions draft, but follows the practice as seen in TCP
5620 sk
->sk_state
= SCTP_SS_LISTENING
;
5621 if (!ep
->base
.bind_addr
.port
) {
5622 if (sctp_autobind(sk
))
5625 if (sctp_get_port(sk
, inet_sk(sk
)->inet_num
)) {
5626 sk
->sk_state
= SCTP_SS_CLOSED
;
5631 sk
->sk_max_ack_backlog
= backlog
;
5632 sctp_hash_endpoint(ep
);
5637 * 4.1.3 / 5.1.3 listen()
5639 * By default, new associations are not accepted for UDP style sockets.
5640 * An application uses listen() to mark a socket as being able to
5641 * accept new associations.
5643 * On TCP style sockets, applications use listen() to ready the SCTP
5644 * endpoint for accepting inbound associations.
5646 * On both types of endpoints a backlog of '0' disables listening.
5648 * Move a socket to LISTENING state.
5650 int sctp_inet_listen(struct socket
*sock
, int backlog
)
5652 struct sock
*sk
= sock
->sk
;
5653 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
5656 if (unlikely(backlog
< 0))
5661 /* Peeled-off sockets are not allowed to listen(). */
5662 if (sctp_style(sk
, UDP_HIGH_BANDWIDTH
))
5665 if (sock
->state
!= SS_UNCONNECTED
)
5668 /* If backlog is zero, disable listening. */
5670 if (sctp_sstate(sk
, CLOSED
))
5674 sctp_unhash_endpoint(ep
);
5675 sk
->sk_state
= SCTP_SS_CLOSED
;
5677 sctp_sk(sk
)->bind_hash
->fastreuse
= 1;
5681 /* If we are already listening, just update the backlog */
5682 if (sctp_sstate(sk
, LISTENING
))
5683 sk
->sk_max_ack_backlog
= backlog
;
5685 err
= sctp_listen_start(sk
, backlog
);
5692 sctp_release_sock(sk
);
5697 * This function is done by modeling the current datagram_poll() and the
5698 * tcp_poll(). Note that, based on these implementations, we don't
5699 * lock the socket in this function, even though it seems that,
5700 * ideally, locking or some other mechanisms can be used to ensure
5701 * the integrity of the counters (sndbuf and wmem_alloc) used
5702 * in this place. We assume that we don't need locks either until proven
5705 * Another thing to note is that we include the Async I/O support
5706 * here, again, by modeling the current TCP/UDP code. We don't have
5707 * a good way to test with it yet.
5709 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
5711 struct sock
*sk
= sock
->sk
;
5712 struct sctp_sock
*sp
= sctp_sk(sk
);
5715 poll_wait(file
, sk_sleep(sk
), wait
);
5717 /* A TCP-style listening socket becomes readable when the accept queue
5720 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
5721 return (!list_empty(&sp
->ep
->asocs
)) ?
5722 (POLLIN
| POLLRDNORM
) : 0;
5726 /* Is there any exceptional events? */
5727 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
5729 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5731 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
5734 /* Is it readable? Reconsider this code with TCP-style support. */
5735 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
5736 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
5737 mask
|= POLLIN
| POLLRDNORM
;
5739 /* The association is either gone or not ready. */
5740 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
5743 /* Is it writable? */
5744 if (sctp_writeable(sk
)) {
5745 mask
|= POLLOUT
| POLLWRNORM
;
5747 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
5749 * Since the socket is not locked, the buffer
5750 * might be made available after the writeable check and
5751 * before the bit is set. This could cause a lost I/O
5752 * signal. tcp_poll() has a race breaker for this race
5753 * condition. Based on their implementation, we put
5754 * in the following code to cover it as well.
5756 if (sctp_writeable(sk
))
5757 mask
|= POLLOUT
| POLLWRNORM
;
5762 /********************************************************************
5763 * 2nd Level Abstractions
5764 ********************************************************************/
5766 static struct sctp_bind_bucket
*sctp_bucket_create(
5767 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
5769 struct sctp_bind_bucket
*pp
;
5771 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
5773 SCTP_DBG_OBJCNT_INC(bind_bucket
);
5776 INIT_HLIST_HEAD(&pp
->owner
);
5777 hlist_add_head(&pp
->node
, &head
->chain
);
5782 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5783 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
5785 if (pp
&& hlist_empty(&pp
->owner
)) {
5786 __hlist_del(&pp
->node
);
5787 kmem_cache_free(sctp_bucket_cachep
, pp
);
5788 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
5792 /* Release this socket's reference to a local port. */
5793 static inline void __sctp_put_port(struct sock
*sk
)
5795 struct sctp_bind_hashbucket
*head
=
5796 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->inet_num
)];
5797 struct sctp_bind_bucket
*pp
;
5799 sctp_spin_lock(&head
->lock
);
5800 pp
= sctp_sk(sk
)->bind_hash
;
5801 __sk_del_bind_node(sk
);
5802 sctp_sk(sk
)->bind_hash
= NULL
;
5803 inet_sk(sk
)->inet_num
= 0;
5804 sctp_bucket_destroy(pp
);
5805 sctp_spin_unlock(&head
->lock
);
5808 void sctp_put_port(struct sock
*sk
)
5810 sctp_local_bh_disable();
5811 __sctp_put_port(sk
);
5812 sctp_local_bh_enable();
5816 * The system picks an ephemeral port and choose an address set equivalent
5817 * to binding with a wildcard address.
5818 * One of those addresses will be the primary address for the association.
5819 * This automatically enables the multihoming capability of SCTP.
5821 static int sctp_autobind(struct sock
*sk
)
5823 union sctp_addr autoaddr
;
5827 /* Initialize a local sockaddr structure to INADDR_ANY. */
5828 af
= sctp_sk(sk
)->pf
->af
;
5830 port
= htons(inet_sk(sk
)->inet_num
);
5831 af
->inaddr_any(&autoaddr
, port
);
5833 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5836 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5839 * 4.2 The cmsghdr Structure *
5841 * When ancillary data is sent or received, any number of ancillary data
5842 * objects can be specified by the msg_control and msg_controllen members of
5843 * the msghdr structure, because each object is preceded by
5844 * a cmsghdr structure defining the object's length (the cmsg_len member).
5845 * Historically Berkeley-derived implementations have passed only one object
5846 * at a time, but this API allows multiple objects to be
5847 * passed in a single call to sendmsg() or recvmsg(). The following example
5848 * shows two ancillary data objects in a control buffer.
5850 * |<--------------------------- msg_controllen -------------------------->|
5853 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5855 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5858 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5860 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5863 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5864 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5866 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5868 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5875 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
5876 sctp_cmsgs_t
*cmsgs
)
5878 struct cmsghdr
*cmsg
;
5879 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
5881 for (cmsg
= CMSG_FIRSTHDR(msg
);
5883 cmsg
= CMSG_NXTHDR(my_msg
, cmsg
)) {
5884 if (!CMSG_OK(my_msg
, cmsg
))
5887 /* Should we parse this header or ignore? */
5888 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
5891 /* Strictly check lengths following example in SCM code. */
5892 switch (cmsg
->cmsg_type
) {
5894 /* SCTP Socket API Extension
5895 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5897 * This cmsghdr structure provides information for
5898 * initializing new SCTP associations with sendmsg().
5899 * The SCTP_INITMSG socket option uses this same data
5900 * structure. This structure is not used for
5903 * cmsg_level cmsg_type cmsg_data[]
5904 * ------------ ------------ ----------------------
5905 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5907 if (cmsg
->cmsg_len
!=
5908 CMSG_LEN(sizeof(struct sctp_initmsg
)))
5910 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
5914 /* SCTP Socket API Extension
5915 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5917 * This cmsghdr structure specifies SCTP options for
5918 * sendmsg() and describes SCTP header information
5919 * about a received message through recvmsg().
5921 * cmsg_level cmsg_type cmsg_data[]
5922 * ------------ ------------ ----------------------
5923 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5925 if (cmsg
->cmsg_len
!=
5926 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
5930 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
5932 /* Minimally, validate the sinfo_flags. */
5933 if (cmsgs
->info
->sinfo_flags
&
5934 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
5935 SCTP_ABORT
| SCTP_EOF
))
5947 * Wait for a packet..
5948 * Note: This function is the same function as in core/datagram.c
5949 * with a few modifications to make lksctp work.
5951 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
5956 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
5958 /* Socket errors? */
5959 error
= sock_error(sk
);
5963 if (!skb_queue_empty(&sk
->sk_receive_queue
))
5966 /* Socket shut down? */
5967 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5970 /* Sequenced packets can come disconnected. If so we report the
5975 /* Is there a good reason to think that we may receive some data? */
5976 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
5979 /* Handle signals. */
5980 if (signal_pending(current
))
5983 /* Let another process have a go. Since we are going to sleep
5984 * anyway. Note: This may cause odd behaviors if the message
5985 * does not fit in the user's buffer, but this seems to be the
5986 * only way to honor MSG_DONTWAIT realistically.
5988 sctp_release_sock(sk
);
5989 *timeo_p
= schedule_timeout(*timeo_p
);
5993 finish_wait(sk_sleep(sk
), &wait
);
5997 error
= sock_intr_errno(*timeo_p
);
6000 finish_wait(sk_sleep(sk
), &wait
);
6005 /* Receive a datagram.
6006 * Note: This is pretty much the same routine as in core/datagram.c
6007 * with a few changes to make lksctp work.
6009 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
6010 int noblock
, int *err
)
6013 struct sk_buff
*skb
;
6016 timeo
= sock_rcvtimeo(sk
, noblock
);
6018 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6019 timeo
, MAX_SCHEDULE_TIMEOUT
);
6022 /* Again only user level code calls this function,
6023 * so nothing interrupt level
6024 * will suddenly eat the receive_queue.
6026 * Look at current nfs client by the way...
6027 * However, this function was corrent in any case. 8)
6029 if (flags
& MSG_PEEK
) {
6030 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
6031 skb
= skb_peek(&sk
->sk_receive_queue
);
6033 atomic_inc(&skb
->users
);
6034 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
6036 skb
= skb_dequeue(&sk
->sk_receive_queue
);
6042 /* Caller is allowed not to check sk->sk_err before calling. */
6043 error
= sock_error(sk
);
6047 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6050 /* User doesn't want to wait. */
6054 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
6063 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6064 static void __sctp_write_space(struct sctp_association
*asoc
)
6066 struct sock
*sk
= asoc
->base
.sk
;
6067 struct socket
*sock
= sk
->sk_socket
;
6069 if ((sctp_wspace(asoc
) > 0) && sock
) {
6070 if (waitqueue_active(&asoc
->wait
))
6071 wake_up_interruptible(&asoc
->wait
);
6073 if (sctp_writeable(sk
)) {
6074 if (sk_sleep(sk
) && waitqueue_active(sk_sleep(sk
)))
6075 wake_up_interruptible(sk_sleep(sk
));
6077 /* Note that we try to include the Async I/O support
6078 * here by modeling from the current TCP/UDP code.
6079 * We have not tested with it yet.
6081 if (sock
->wq
->fasync_list
&&
6082 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
6083 sock_wake_async(sock
,
6084 SOCK_WAKE_SPACE
, POLL_OUT
);
6089 /* Do accounting for the sndbuf space.
6090 * Decrement the used sndbuf space of the corresponding association by the
6091 * data size which was just transmitted(freed).
6093 static void sctp_wfree(struct sk_buff
*skb
)
6095 struct sctp_association
*asoc
;
6096 struct sctp_chunk
*chunk
;
6099 /* Get the saved chunk pointer. */
6100 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
6103 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
6104 sizeof(struct sk_buff
) +
6105 sizeof(struct sctp_chunk
);
6107 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
6110 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6112 sk
->sk_wmem_queued
-= skb
->truesize
;
6113 sk_mem_uncharge(sk
, skb
->truesize
);
6116 __sctp_write_space(asoc
);
6118 sctp_association_put(asoc
);
6121 /* Do accounting for the receive space on the socket.
6122 * Accounting for the association is done in ulpevent.c
6123 * We set this as a destructor for the cloned data skbs so that
6124 * accounting is done at the correct time.
6126 void sctp_sock_rfree(struct sk_buff
*skb
)
6128 struct sock
*sk
= skb
->sk
;
6129 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
6131 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
6134 * Mimic the behavior of sock_rfree
6136 sk_mem_uncharge(sk
, event
->rmem_len
);
6140 /* Helper function to wait for space in the sndbuf. */
6141 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
6144 struct sock
*sk
= asoc
->base
.sk
;
6146 long current_timeo
= *timeo_p
;
6149 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6150 asoc
, (long)(*timeo_p
), msg_len
);
6152 /* Increment the association's refcnt. */
6153 sctp_association_hold(asoc
);
6155 /* Wait on the association specific sndbuf space. */
6157 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6158 TASK_INTERRUPTIBLE
);
6161 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6164 if (signal_pending(current
))
6165 goto do_interrupted
;
6166 if (msg_len
<= sctp_wspace(asoc
))
6169 /* Let another process have a go. Since we are going
6172 sctp_release_sock(sk
);
6173 current_timeo
= schedule_timeout(current_timeo
);
6174 BUG_ON(sk
!= asoc
->base
.sk
);
6177 *timeo_p
= current_timeo
;
6181 finish_wait(&asoc
->wait
, &wait
);
6183 /* Release the association's refcnt. */
6184 sctp_association_put(asoc
);
6193 err
= sock_intr_errno(*timeo_p
);
6201 void sctp_data_ready(struct sock
*sk
, int len
)
6203 struct socket_wq
*wq
;
6206 wq
= rcu_dereference(sk
->sk_wq
);
6207 if (wq_has_sleeper(wq
))
6208 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
6209 POLLRDNORM
| POLLRDBAND
);
6210 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
6214 /* If socket sndbuf has changed, wake up all per association waiters. */
6215 void sctp_write_space(struct sock
*sk
)
6217 struct sctp_association
*asoc
;
6219 /* Wake up the tasks in each wait queue. */
6220 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
6221 __sctp_write_space(asoc
);
6225 /* Is there any sndbuf space available on the socket?
6227 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6228 * associations on the same socket. For a UDP-style socket with
6229 * multiple associations, it is possible for it to be "unwriteable"
6230 * prematurely. I assume that this is acceptable because
6231 * a premature "unwriteable" is better than an accidental "writeable" which
6232 * would cause an unwanted block under certain circumstances. For the 1-1
6233 * UDP-style sockets or TCP-style sockets, this code should work.
6236 static int sctp_writeable(struct sock
*sk
)
6240 amt
= sk
->sk_sndbuf
- sk_wmem_alloc_get(sk
);
6246 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6247 * returns immediately with EINPROGRESS.
6249 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
6251 struct sock
*sk
= asoc
->base
.sk
;
6253 long current_timeo
= *timeo_p
;
6256 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__
, asoc
,
6259 /* Increment the association's refcnt. */
6260 sctp_association_hold(asoc
);
6263 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6264 TASK_INTERRUPTIBLE
);
6267 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6269 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6272 if (signal_pending(current
))
6273 goto do_interrupted
;
6275 if (sctp_state(asoc
, ESTABLISHED
))
6278 /* Let another process have a go. Since we are going
6281 sctp_release_sock(sk
);
6282 current_timeo
= schedule_timeout(current_timeo
);
6285 *timeo_p
= current_timeo
;
6289 finish_wait(&asoc
->wait
, &wait
);
6291 /* Release the association's refcnt. */
6292 sctp_association_put(asoc
);
6297 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
6300 err
= -ECONNREFUSED
;
6304 err
= sock_intr_errno(*timeo_p
);
6312 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
6314 struct sctp_endpoint
*ep
;
6318 ep
= sctp_sk(sk
)->ep
;
6322 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
6323 TASK_INTERRUPTIBLE
);
6325 if (list_empty(&ep
->asocs
)) {
6326 sctp_release_sock(sk
);
6327 timeo
= schedule_timeout(timeo
);
6332 if (!sctp_sstate(sk
, LISTENING
))
6336 if (!list_empty(&ep
->asocs
))
6339 err
= sock_intr_errno(timeo
);
6340 if (signal_pending(current
))
6348 finish_wait(sk_sleep(sk
), &wait
);
6353 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
6358 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
6359 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
6361 sctp_release_sock(sk
);
6362 timeout
= schedule_timeout(timeout
);
6364 } while (!signal_pending(current
) && timeout
);
6366 finish_wait(sk_sleep(sk
), &wait
);
6369 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
6371 struct sk_buff
*frag
;
6376 /* Don't forget the fragments. */
6377 skb_walk_frags(skb
, frag
)
6378 sctp_skb_set_owner_r_frag(frag
, sk
);
6381 sctp_skb_set_owner_r(skb
, sk
);
6384 void sctp_copy_sock(struct sock
*newsk
, struct sock
*sk
,
6385 struct sctp_association
*asoc
)
6387 struct inet_sock
*inet
= inet_sk(sk
);
6388 struct inet_sock
*newinet
;
6390 newsk
->sk_type
= sk
->sk_type
;
6391 newsk
->sk_bound_dev_if
= sk
->sk_bound_dev_if
;
6392 newsk
->sk_flags
= sk
->sk_flags
;
6393 newsk
->sk_no_check
= sk
->sk_no_check
;
6394 newsk
->sk_reuse
= sk
->sk_reuse
;
6396 newsk
->sk_shutdown
= sk
->sk_shutdown
;
6397 newsk
->sk_destruct
= inet_sock_destruct
;
6398 newsk
->sk_family
= sk
->sk_family
;
6399 newsk
->sk_protocol
= IPPROTO_SCTP
;
6400 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
6401 newsk
->sk_sndbuf
= sk
->sk_sndbuf
;
6402 newsk
->sk_rcvbuf
= sk
->sk_rcvbuf
;
6403 newsk
->sk_lingertime
= sk
->sk_lingertime
;
6404 newsk
->sk_rcvtimeo
= sk
->sk_rcvtimeo
;
6405 newsk
->sk_sndtimeo
= sk
->sk_sndtimeo
;
6407 newinet
= inet_sk(newsk
);
6409 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6410 * getsockname() and getpeername()
6412 newinet
->inet_sport
= inet
->inet_sport
;
6413 newinet
->inet_saddr
= inet
->inet_saddr
;
6414 newinet
->inet_rcv_saddr
= inet
->inet_rcv_saddr
;
6415 newinet
->inet_dport
= htons(asoc
->peer
.port
);
6416 newinet
->pmtudisc
= inet
->pmtudisc
;
6417 newinet
->inet_id
= asoc
->next_tsn
^ jiffies
;
6419 newinet
->uc_ttl
= inet
->uc_ttl
;
6420 newinet
->mc_loop
= 1;
6421 newinet
->mc_ttl
= 1;
6422 newinet
->mc_index
= 0;
6423 newinet
->mc_list
= NULL
;
6426 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6427 * and its messages to the newsk.
6429 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
6430 struct sctp_association
*assoc
,
6431 sctp_socket_type_t type
)
6433 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
6434 struct sctp_sock
*newsp
= sctp_sk(newsk
);
6435 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
6436 struct sctp_endpoint
*newep
= newsp
->ep
;
6437 struct sk_buff
*skb
, *tmp
;
6438 struct sctp_ulpevent
*event
;
6439 struct sctp_bind_hashbucket
*head
;
6441 /* Migrate socket buffer sizes and all the socket level options to the
6444 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
6445 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
6446 /* Brute force copy old sctp opt. */
6447 inet_sk_copy_descendant(newsk
, oldsk
);
6449 /* Restore the ep value that was overwritten with the above structure
6455 /* Hook this new socket in to the bind_hash list. */
6456 head
= &sctp_port_hashtable
[sctp_phashfn(inet_sk(oldsk
)->inet_num
)];
6457 sctp_local_bh_disable();
6458 sctp_spin_lock(&head
->lock
);
6459 pp
= sctp_sk(oldsk
)->bind_hash
;
6460 sk_add_bind_node(newsk
, &pp
->owner
);
6461 sctp_sk(newsk
)->bind_hash
= pp
;
6462 inet_sk(newsk
)->inet_num
= inet_sk(oldsk
)->inet_num
;
6463 sctp_spin_unlock(&head
->lock
);
6464 sctp_local_bh_enable();
6466 /* Copy the bind_addr list from the original endpoint to the new
6467 * endpoint so that we can handle restarts properly
6469 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
6470 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
6472 /* Move any messages in the old socket's receive queue that are for the
6473 * peeled off association to the new socket's receive queue.
6475 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
6476 event
= sctp_skb2event(skb
);
6477 if (event
->asoc
== assoc
) {
6478 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
6479 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
6480 sctp_skb_set_owner_r_frag(skb
, newsk
);
6484 /* Clean up any messages pending delivery due to partial
6485 * delivery. Three cases:
6486 * 1) No partial deliver; no work.
6487 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6488 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6490 skb_queue_head_init(&newsp
->pd_lobby
);
6491 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
6493 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
6494 struct sk_buff_head
*queue
;
6496 /* Decide which queue to move pd_lobby skbs to. */
6497 if (assoc
->ulpq
.pd_mode
) {
6498 queue
= &newsp
->pd_lobby
;
6500 queue
= &newsk
->sk_receive_queue
;
6502 /* Walk through the pd_lobby, looking for skbs that
6503 * need moved to the new socket.
6505 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6506 event
= sctp_skb2event(skb
);
6507 if (event
->asoc
== assoc
) {
6508 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6509 __skb_queue_tail(queue
, skb
);
6510 sctp_skb_set_owner_r_frag(skb
, newsk
);
6514 /* Clear up any skbs waiting for the partial
6515 * delivery to finish.
6517 if (assoc
->ulpq
.pd_mode
)
6518 sctp_clear_pd(oldsk
, NULL
);
6522 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
)
6523 sctp_skb_set_owner_r_frag(skb
, newsk
);
6525 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
)
6526 sctp_skb_set_owner_r_frag(skb
, newsk
);
6528 /* Set the type of socket to indicate that it is peeled off from the
6529 * original UDP-style socket or created with the accept() call on a
6530 * TCP-style socket..
6534 /* Mark the new socket "in-use" by the user so that any packets
6535 * that may arrive on the association after we've moved it are
6536 * queued to the backlog. This prevents a potential race between
6537 * backlog processing on the old socket and new-packet processing
6538 * on the new socket.
6540 * The caller has just allocated newsk so we can guarantee that other
6541 * paths won't try to lock it and then oldsk.
6543 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
6544 sctp_assoc_migrate(assoc
, newsk
);
6546 /* If the association on the newsk is already closed before accept()
6547 * is called, set RCV_SHUTDOWN flag.
6549 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
6550 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
6552 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
6553 sctp_release_sock(newsk
);
6557 /* This proto struct describes the ULP interface for SCTP. */
6558 struct proto sctp_prot
= {
6560 .owner
= THIS_MODULE
,
6561 .close
= sctp_close
,
6562 .connect
= sctp_connect
,
6563 .disconnect
= sctp_disconnect
,
6564 .accept
= sctp_accept
,
6565 .ioctl
= sctp_ioctl
,
6566 .init
= sctp_init_sock
,
6567 .destroy
= sctp_destroy_sock
,
6568 .shutdown
= sctp_shutdown
,
6569 .setsockopt
= sctp_setsockopt
,
6570 .getsockopt
= sctp_getsockopt
,
6571 .sendmsg
= sctp_sendmsg
,
6572 .recvmsg
= sctp_recvmsg
,
6574 .backlog_rcv
= sctp_backlog_rcv
,
6576 .unhash
= sctp_unhash
,
6577 .get_port
= sctp_get_port
,
6578 .obj_size
= sizeof(struct sctp_sock
),
6579 .sysctl_mem
= sysctl_sctp_mem
,
6580 .sysctl_rmem
= sysctl_sctp_rmem
,
6581 .sysctl_wmem
= sysctl_sctp_wmem
,
6582 .memory_pressure
= &sctp_memory_pressure
,
6583 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6584 .memory_allocated
= &sctp_memory_allocated
,
6585 .sockets_allocated
= &sctp_sockets_allocated
,
6588 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6590 struct proto sctpv6_prot
= {
6592 .owner
= THIS_MODULE
,
6593 .close
= sctp_close
,
6594 .connect
= sctp_connect
,
6595 .disconnect
= sctp_disconnect
,
6596 .accept
= sctp_accept
,
6597 .ioctl
= sctp_ioctl
,
6598 .init
= sctp_init_sock
,
6599 .destroy
= sctp_destroy_sock
,
6600 .shutdown
= sctp_shutdown
,
6601 .setsockopt
= sctp_setsockopt
,
6602 .getsockopt
= sctp_getsockopt
,
6603 .sendmsg
= sctp_sendmsg
,
6604 .recvmsg
= sctp_recvmsg
,
6606 .backlog_rcv
= sctp_backlog_rcv
,
6608 .unhash
= sctp_unhash
,
6609 .get_port
= sctp_get_port
,
6610 .obj_size
= sizeof(struct sctp6_sock
),
6611 .sysctl_mem
= sysctl_sctp_mem
,
6612 .sysctl_rmem
= sysctl_sctp_rmem
,
6613 .sysctl_wmem
= sysctl_sctp_wmem
,
6614 .memory_pressure
= &sctp_memory_pressure
,
6615 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6616 .memory_allocated
= &sctp_memory_allocated
,
6617 .sockets_allocated
= &sctp_sockets_allocated
,
6619 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */