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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
62 #include <linux/types.h>
63 #include <linux/kernel.h>
64 #include <linux/wait.h>
65 #include <linux/time.h>
67 #include <linux/capability.h>
68 #include <linux/fcntl.h>
69 #include <linux/poll.h>
70 #include <linux/init.h>
71 #include <linux/crypto.h>
72 #include <linux/slab.h>
76 #include <net/route.h>
78 #include <net/inet_common.h>
80 #include <linux/socket.h> /* for sa_family_t */
82 #include <net/sctp/sctp.h>
83 #include <net/sctp/sm.h>
85 /* WARNING: Please do not remove the SCTP_STATIC attribute to
86 * any of the functions below as they are used to export functions
87 * used by a project regression testsuite.
90 /* Forward declarations for internal helper functions. */
91 static int sctp_writeable(struct sock
*sk
);
92 static void sctp_wfree(struct sk_buff
*skb
);
93 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
95 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
);
96 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
97 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
98 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
99 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
100 union sctp_addr
*addr
, int len
);
101 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
102 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
103 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
104 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
105 static int sctp_send_asconf(struct sctp_association
*asoc
,
106 struct sctp_chunk
*chunk
);
107 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
108 static int sctp_autobind(struct sock
*sk
);
109 static void sctp_sock_migrate(struct sock
*, struct sock
*,
110 struct sctp_association
*, sctp_socket_type_t
);
111 static char *sctp_hmac_alg
= SCTP_COOKIE_HMAC_ALG
;
113 extern struct kmem_cache
*sctp_bucket_cachep
;
114 extern long sysctl_sctp_mem
[3];
115 extern int sysctl_sctp_rmem
[3];
116 extern int sysctl_sctp_wmem
[3];
118 static int sctp_memory_pressure
;
119 static atomic_long_t sctp_memory_allocated
;
120 struct percpu_counter sctp_sockets_allocated
;
122 static void sctp_enter_memory_pressure(struct sock
*sk
)
124 sctp_memory_pressure
= 1;
128 /* Get the sndbuf space available at the time on the association. */
129 static inline int sctp_wspace(struct sctp_association
*asoc
)
133 if (asoc
->ep
->sndbuf_policy
)
134 amt
= asoc
->sndbuf_used
;
136 amt
= sk_wmem_alloc_get(asoc
->base
.sk
);
138 if (amt
>= asoc
->base
.sk
->sk_sndbuf
) {
139 if (asoc
->base
.sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)
142 amt
= sk_stream_wspace(asoc
->base
.sk
);
147 amt
= asoc
->base
.sk
->sk_sndbuf
- amt
;
152 /* Increment the used sndbuf space count of the corresponding association by
153 * the size of the outgoing data chunk.
154 * Also, set the skb destructor for sndbuf accounting later.
156 * Since it is always 1-1 between chunk and skb, and also a new skb is always
157 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
158 * destructor in the data chunk skb for the purpose of the sndbuf space
161 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
163 struct sctp_association
*asoc
= chunk
->asoc
;
164 struct sock
*sk
= asoc
->base
.sk
;
166 /* The sndbuf space is tracked per association. */
167 sctp_association_hold(asoc
);
169 skb_set_owner_w(chunk
->skb
, sk
);
171 chunk
->skb
->destructor
= sctp_wfree
;
172 /* Save the chunk pointer in skb for sctp_wfree to use later. */
173 *((struct sctp_chunk
**)(chunk
->skb
->cb
)) = chunk
;
175 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
176 sizeof(struct sk_buff
) +
177 sizeof(struct sctp_chunk
);
179 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
180 sk
->sk_wmem_queued
+= chunk
->skb
->truesize
;
181 sk_mem_charge(sk
, chunk
->skb
->truesize
);
184 /* Verify that this is a valid address. */
185 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
190 /* Verify basic sockaddr. */
191 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
195 /* Is this a valid SCTP address? */
196 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
199 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
205 /* Look up the association by its id. If this is not a UDP-style
206 * socket, the ID field is always ignored.
208 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
210 struct sctp_association
*asoc
= NULL
;
212 /* If this is not a UDP-style socket, assoc id should be ignored. */
213 if (!sctp_style(sk
, UDP
)) {
214 /* Return NULL if the socket state is not ESTABLISHED. It
215 * could be a TCP-style listening socket or a socket which
216 * hasn't yet called connect() to establish an association.
218 if (!sctp_sstate(sk
, ESTABLISHED
))
221 /* Get the first and the only association from the list. */
222 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
223 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
224 struct sctp_association
, asocs
);
228 /* Otherwise this is a UDP-style socket. */
229 if (!id
|| (id
== (sctp_assoc_t
)-1))
232 spin_lock_bh(&sctp_assocs_id_lock
);
233 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
234 spin_unlock_bh(&sctp_assocs_id_lock
);
236 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
242 /* Look up the transport from an address and an assoc id. If both address and
243 * id are specified, the associations matching the address and the id should be
246 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
247 struct sockaddr_storage
*addr
,
250 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
251 struct sctp_transport
*transport
;
252 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
254 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
261 id_asoc
= sctp_id2assoc(sk
, id
);
262 if (id_asoc
&& (id_asoc
!= addr_asoc
))
265 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
266 (union sctp_addr
*)addr
);
271 /* API 3.1.2 bind() - UDP Style Syntax
272 * The syntax of bind() is,
274 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
276 * sd - the socket descriptor returned by socket().
277 * addr - the address structure (struct sockaddr_in or struct
278 * sockaddr_in6 [RFC 2553]),
279 * addr_len - the size of the address structure.
281 SCTP_STATIC
int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
287 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
290 /* Disallow binding twice. */
291 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
292 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
297 sctp_release_sock(sk
);
302 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
304 /* Verify this is a valid sockaddr. */
305 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
306 union sctp_addr
*addr
, int len
)
310 /* Check minimum size. */
311 if (len
< sizeof (struct sockaddr
))
314 /* V4 mapped address are really of AF_INET family */
315 if (addr
->sa
.sa_family
== AF_INET6
&&
316 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
)) {
317 if (!opt
->pf
->af_supported(AF_INET
, opt
))
320 /* Does this PF support this AF? */
321 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
325 /* If we get this far, af is valid. */
326 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
328 if (len
< af
->sockaddr_len
)
334 /* Bind a local address either to an endpoint or to an association. */
335 SCTP_STATIC
int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
337 struct sctp_sock
*sp
= sctp_sk(sk
);
338 struct sctp_endpoint
*ep
= sp
->ep
;
339 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
344 /* Common sockaddr verification. */
345 af
= sctp_sockaddr_af(sp
, addr
, len
);
347 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
352 snum
= ntohs(addr
->v4
.sin_port
);
354 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
355 ", port: %d, new port: %d, len: %d)\n",
361 /* PF specific bind() address verification. */
362 if (!sp
->pf
->bind_verify(sp
, addr
))
363 return -EADDRNOTAVAIL
;
365 /* We must either be unbound, or bind to the same port.
366 * It's OK to allow 0 ports if we are already bound.
367 * We'll just inhert an already bound port in this case
372 else if (snum
!= bp
->port
) {
373 SCTP_DEBUG_PRINTK("sctp_do_bind:"
374 " New port %d does not match existing port "
375 "%d.\n", snum
, bp
->port
);
380 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
383 /* See if the address matches any of the addresses we may have
384 * already bound before checking against other endpoints.
386 if (sctp_bind_addr_match(bp
, addr
, sp
))
389 /* Make sure we are allowed to bind here.
390 * The function sctp_get_port_local() does duplicate address
393 addr
->v4
.sin_port
= htons(snum
);
394 if ((ret
= sctp_get_port_local(sk
, addr
))) {
398 /* Refresh ephemeral port. */
400 bp
->port
= inet_sk(sk
)->inet_num
;
402 /* Add the address to the bind address list.
403 * Use GFP_ATOMIC since BHs will be disabled.
405 ret
= sctp_add_bind_addr(bp
, addr
, SCTP_ADDR_SRC
, GFP_ATOMIC
);
407 /* Copy back into socket for getsockname() use. */
409 inet_sk(sk
)->inet_sport
= htons(inet_sk(sk
)->inet_num
);
410 af
->to_sk_saddr(addr
, sk
);
416 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
418 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
419 * at any one time. If a sender, after sending an ASCONF chunk, decides
420 * it needs to transfer another ASCONF Chunk, it MUST wait until the
421 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
422 * subsequent ASCONF. Note this restriction binds each side, so at any
423 * time two ASCONF may be in-transit on any given association (one sent
424 * from each endpoint).
426 static int sctp_send_asconf(struct sctp_association
*asoc
,
427 struct sctp_chunk
*chunk
)
431 /* If there is an outstanding ASCONF chunk, queue it for later
434 if (asoc
->addip_last_asconf
) {
435 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
439 /* Hold the chunk until an ASCONF_ACK is received. */
440 sctp_chunk_hold(chunk
);
441 retval
= sctp_primitive_ASCONF(asoc
, chunk
);
443 sctp_chunk_free(chunk
);
445 asoc
->addip_last_asconf
= chunk
;
451 /* Add a list of addresses as bind addresses to local endpoint or
454 * Basically run through each address specified in the addrs/addrcnt
455 * array/length pair, determine if it is IPv6 or IPv4 and call
456 * sctp_do_bind() on it.
458 * If any of them fails, then the operation will be reversed and the
459 * ones that were added will be removed.
461 * Only sctp_setsockopt_bindx() is supposed to call this function.
463 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
468 struct sockaddr
*sa_addr
;
471 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
475 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
476 /* The list may contain either IPv4 or IPv6 address;
477 * determine the address length for walking thru the list.
479 sa_addr
= (struct sockaddr
*)addr_buf
;
480 af
= sctp_get_af_specific(sa_addr
->sa_family
);
486 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
489 addr_buf
+= af
->sockaddr_len
;
493 /* Failed. Cleanup the ones that have been added */
495 sctp_bindx_rem(sk
, addrs
, cnt
);
503 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
504 * associations that are part of the endpoint indicating that a list of local
505 * addresses are added to the endpoint.
507 * If any of the addresses is already in the bind address list of the
508 * association, we do not send the chunk for that association. But it will not
509 * affect other associations.
511 * Only sctp_setsockopt_bindx() is supposed to call this function.
513 static int sctp_send_asconf_add_ip(struct sock
*sk
,
514 struct sockaddr
*addrs
,
517 struct sctp_sock
*sp
;
518 struct sctp_endpoint
*ep
;
519 struct sctp_association
*asoc
;
520 struct sctp_bind_addr
*bp
;
521 struct sctp_chunk
*chunk
;
522 struct sctp_sockaddr_entry
*laddr
;
523 union sctp_addr
*addr
;
524 union sctp_addr saveaddr
;
531 if (!sctp_addip_enable
)
537 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
538 __func__
, sk
, addrs
, addrcnt
);
540 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
542 if (!asoc
->peer
.asconf_capable
)
545 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
548 if (!sctp_state(asoc
, ESTABLISHED
))
551 /* Check if any address in the packed array of addresses is
552 * in the bind address list of the association. If so,
553 * do not send the asconf chunk to its peer, but continue with
554 * other associations.
557 for (i
= 0; i
< addrcnt
; i
++) {
558 addr
= (union sctp_addr
*)addr_buf
;
559 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
565 if (sctp_assoc_lookup_laddr(asoc
, addr
))
568 addr_buf
+= af
->sockaddr_len
;
573 /* Use the first valid address in bind addr list of
574 * association as Address Parameter of ASCONF CHUNK.
576 bp
= &asoc
->base
.bind_addr
;
577 p
= bp
->address_list
.next
;
578 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
579 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
580 addrcnt
, SCTP_PARAM_ADD_IP
);
586 retval
= sctp_send_asconf(asoc
, chunk
);
590 /* Add the new addresses to the bind address list with
591 * use_as_src set to 0.
594 for (i
= 0; i
< addrcnt
; i
++) {
595 addr
= (union sctp_addr
*)addr_buf
;
596 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
597 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
598 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
599 SCTP_ADDR_NEW
, GFP_ATOMIC
);
600 addr_buf
+= af
->sockaddr_len
;
608 /* Remove a list of addresses from bind addresses list. Do not remove the
611 * Basically run through each address specified in the addrs/addrcnt
612 * array/length pair, determine if it is IPv6 or IPv4 and call
613 * sctp_del_bind() on it.
615 * If any of them fails, then the operation will be reversed and the
616 * ones that were removed will be added back.
618 * At least one address has to be left; if only one address is
619 * available, the operation will return -EBUSY.
621 * Only sctp_setsockopt_bindx() is supposed to call this function.
623 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
625 struct sctp_sock
*sp
= sctp_sk(sk
);
626 struct sctp_endpoint
*ep
= sp
->ep
;
628 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
631 union sctp_addr
*sa_addr
;
634 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
638 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
639 /* If the bind address list is empty or if there is only one
640 * bind address, there is nothing more to be removed (we need
641 * at least one address here).
643 if (list_empty(&bp
->address_list
) ||
644 (sctp_list_single_entry(&bp
->address_list
))) {
649 sa_addr
= (union sctp_addr
*)addr_buf
;
650 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
656 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
657 retval
= -EADDRNOTAVAIL
;
661 if (sa_addr
->v4
.sin_port
&&
662 sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
667 if (!sa_addr
->v4
.sin_port
)
668 sa_addr
->v4
.sin_port
= htons(bp
->port
);
670 /* FIXME - There is probably a need to check if sk->sk_saddr and
671 * sk->sk_rcv_addr are currently set to one of the addresses to
672 * be removed. This is something which needs to be looked into
673 * when we are fixing the outstanding issues with multi-homing
674 * socket routing and failover schemes. Refer to comments in
675 * sctp_do_bind(). -daisy
677 retval
= sctp_del_bind_addr(bp
, sa_addr
);
679 addr_buf
+= af
->sockaddr_len
;
682 /* Failed. Add the ones that has been removed back */
684 sctp_bindx_add(sk
, addrs
, cnt
);
692 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
693 * the associations that are part of the endpoint indicating that a list of
694 * local addresses are removed from the endpoint.
696 * If any of the addresses is already in the bind address list of the
697 * association, we do not send the chunk for that association. But it will not
698 * affect other associations.
700 * Only sctp_setsockopt_bindx() is supposed to call this function.
702 static int sctp_send_asconf_del_ip(struct sock
*sk
,
703 struct sockaddr
*addrs
,
706 struct sctp_sock
*sp
;
707 struct sctp_endpoint
*ep
;
708 struct sctp_association
*asoc
;
709 struct sctp_transport
*transport
;
710 struct sctp_bind_addr
*bp
;
711 struct sctp_chunk
*chunk
;
712 union sctp_addr
*laddr
;
715 struct sctp_sockaddr_entry
*saddr
;
719 if (!sctp_addip_enable
)
725 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
726 __func__
, sk
, addrs
, addrcnt
);
728 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
730 if (!asoc
->peer
.asconf_capable
)
733 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
736 if (!sctp_state(asoc
, ESTABLISHED
))
739 /* Check if any address in the packed array of addresses is
740 * not present in the bind address list of the association.
741 * If so, do not send the asconf chunk to its peer, but
742 * continue with other associations.
745 for (i
= 0; i
< addrcnt
; i
++) {
746 laddr
= (union sctp_addr
*)addr_buf
;
747 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
753 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
756 addr_buf
+= af
->sockaddr_len
;
761 /* Find one address in the association's bind address list
762 * that is not in the packed array of addresses. This is to
763 * make sure that we do not delete all the addresses in the
766 bp
= &asoc
->base
.bind_addr
;
767 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
772 /* We do not need RCU protection throughout this loop
773 * because this is done under a socket lock from the
776 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
783 /* Reset use_as_src flag for the addresses in the bind address
784 * list that are to be deleted.
787 for (i
= 0; i
< addrcnt
; i
++) {
788 laddr
= (union sctp_addr
*)addr_buf
;
789 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
790 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
791 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
792 saddr
->state
= SCTP_ADDR_DEL
;
794 addr_buf
+= af
->sockaddr_len
;
797 /* Update the route and saddr entries for all the transports
798 * as some of the addresses in the bind address list are
799 * about to be deleted and cannot be used as source addresses.
801 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
803 dst_release(transport
->dst
);
804 sctp_transport_route(transport
, NULL
,
805 sctp_sk(asoc
->base
.sk
));
808 retval
= sctp_send_asconf(asoc
, chunk
);
814 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
817 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
820 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
821 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
824 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
825 * Section 3.1.2 for this usage.
827 * addrs is a pointer to an array of one or more socket addresses. Each
828 * address is contained in its appropriate structure (i.e. struct
829 * sockaddr_in or struct sockaddr_in6) the family of the address type
830 * must be used to distinguish the address length (note that this
831 * representation is termed a "packed array" of addresses). The caller
832 * specifies the number of addresses in the array with addrcnt.
834 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
835 * -1, and sets errno to the appropriate error code.
837 * For SCTP, the port given in each socket address must be the same, or
838 * sctp_bindx() will fail, setting errno to EINVAL.
840 * The flags parameter is formed from the bitwise OR of zero or more of
841 * the following currently defined flags:
843 * SCTP_BINDX_ADD_ADDR
845 * SCTP_BINDX_REM_ADDR
847 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
848 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
849 * addresses from the association. The two flags are mutually exclusive;
850 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
851 * not remove all addresses from an association; sctp_bindx() will
852 * reject such an attempt with EINVAL.
854 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
855 * additional addresses with an endpoint after calling bind(). Or use
856 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
857 * socket is associated with so that no new association accepted will be
858 * associated with those addresses. If the endpoint supports dynamic
859 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
860 * endpoint to send the appropriate message to the peer to change the
861 * peers address lists.
863 * Adding and removing addresses from a connected association is
864 * optional functionality. Implementations that do not support this
865 * functionality should return EOPNOTSUPP.
867 * Basically do nothing but copying the addresses from user to kernel
868 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
869 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
872 * We don't use copy_from_user() for optimization: we first do the
873 * sanity checks (buffer size -fast- and access check-healthy
874 * pointer); if all of those succeed, then we can alloc the memory
875 * (expensive operation) needed to copy the data to kernel. Then we do
876 * the copying without checking the user space area
877 * (__copy_from_user()).
879 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
882 * sk The sk of the socket
883 * addrs The pointer to the addresses in user land
884 * addrssize Size of the addrs buffer
885 * op Operation to perform (add or remove, see the flags of
888 * Returns 0 if ok, <0 errno code on error.
890 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
891 struct sockaddr __user
*addrs
,
892 int addrs_size
, int op
)
894 struct sockaddr
*kaddrs
;
898 struct sockaddr
*sa_addr
;
902 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
903 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
905 if (unlikely(addrs_size
<= 0))
908 /* Check the user passed a healthy pointer. */
909 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
912 /* Alloc space for the address array in kernel memory. */
913 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
914 if (unlikely(!kaddrs
))
917 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
922 /* Walk through the addrs buffer and count the number of addresses. */
924 while (walk_size
< addrs_size
) {
925 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
930 sa_addr
= (struct sockaddr
*)addr_buf
;
931 af
= sctp_get_af_specific(sa_addr
->sa_family
);
933 /* If the address family is not supported or if this address
934 * causes the address buffer to overflow return EINVAL.
936 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
941 addr_buf
+= af
->sockaddr_len
;
942 walk_size
+= af
->sockaddr_len
;
947 case SCTP_BINDX_ADD_ADDR
:
948 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
951 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
954 case SCTP_BINDX_REM_ADDR
:
955 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
958 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
972 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
974 * Common routine for handling connect() and sctp_connectx().
975 * Connect will come in with just a single address.
977 static int __sctp_connect(struct sock
* sk
,
978 struct sockaddr
*kaddrs
,
980 sctp_assoc_t
*assoc_id
)
982 struct sctp_sock
*sp
;
983 struct sctp_endpoint
*ep
;
984 struct sctp_association
*asoc
= NULL
;
985 struct sctp_association
*asoc2
;
986 struct sctp_transport
*transport
;
994 union sctp_addr
*sa_addr
= NULL
;
997 unsigned int f_flags
= 0;
1002 /* connect() cannot be done on a socket that is already in ESTABLISHED
1003 * state - UDP-style peeled off socket or a TCP-style socket that
1004 * is already connected.
1005 * It cannot be done even on a TCP-style listening socket.
1007 if (sctp_sstate(sk
, ESTABLISHED
) ||
1008 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
1013 /* Walk through the addrs buffer and count the number of addresses. */
1015 while (walk_size
< addrs_size
) {
1016 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1021 sa_addr
= (union sctp_addr
*)addr_buf
;
1022 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1024 /* If the address family is not supported or if this address
1025 * causes the address buffer to overflow return EINVAL.
1027 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1032 port
= ntohs(sa_addr
->v4
.sin_port
);
1034 /* Save current address so we can work with it */
1035 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1037 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1041 /* Make sure the destination port is correctly set
1044 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
)
1048 /* Check if there already is a matching association on the
1049 * endpoint (other than the one created here).
1051 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1052 if (asoc2
&& asoc2
!= asoc
) {
1053 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1060 /* If we could not find a matching association on the endpoint,
1061 * make sure that there is no peeled-off association matching
1062 * the peer address even on another socket.
1064 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1065 err
= -EADDRNOTAVAIL
;
1070 /* If a bind() or sctp_bindx() is not called prior to
1071 * an sctp_connectx() call, the system picks an
1072 * ephemeral port and will choose an address set
1073 * equivalent to binding with a wildcard address.
1075 if (!ep
->base
.bind_addr
.port
) {
1076 if (sctp_autobind(sk
)) {
1082 * If an unprivileged user inherits a 1-many
1083 * style socket with open associations on a
1084 * privileged port, it MAY be permitted to
1085 * accept new associations, but it SHOULD NOT
1086 * be permitted to open new associations.
1088 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1089 !capable(CAP_NET_BIND_SERVICE
)) {
1095 scope
= sctp_scope(&to
);
1096 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1102 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
,
1110 /* Prime the peer's transport structures. */
1111 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1119 addr_buf
+= af
->sockaddr_len
;
1120 walk_size
+= af
->sockaddr_len
;
1123 /* In case the user of sctp_connectx() wants an association
1124 * id back, assign one now.
1127 err
= sctp_assoc_set_id(asoc
, GFP_KERNEL
);
1132 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1137 /* Initialize sk's dport and daddr for getpeername() */
1138 inet_sk(sk
)->inet_dport
= htons(asoc
->peer
.port
);
1139 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1140 af
->to_sk_daddr(sa_addr
, sk
);
1143 /* in-kernel sockets don't generally have a file allocated to them
1144 * if all they do is call sock_create_kern().
1146 if (sk
->sk_socket
->file
)
1147 f_flags
= sk
->sk_socket
->file
->f_flags
;
1149 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1151 err
= sctp_wait_for_connect(asoc
, &timeo
);
1152 if ((err
== 0 || err
== -EINPROGRESS
) && assoc_id
)
1153 *assoc_id
= asoc
->assoc_id
;
1155 /* Don't free association on exit. */
1160 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1161 " kaddrs: %p err: %d\n",
1164 sctp_association_free(asoc
);
1168 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1171 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1172 * sctp_assoc_t *asoc);
1174 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1175 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1176 * or IPv6 addresses.
1178 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1179 * Section 3.1.2 for this usage.
1181 * addrs is a pointer to an array of one or more socket addresses. Each
1182 * address is contained in its appropriate structure (i.e. struct
1183 * sockaddr_in or struct sockaddr_in6) the family of the address type
1184 * must be used to distengish the address length (note that this
1185 * representation is termed a "packed array" of addresses). The caller
1186 * specifies the number of addresses in the array with addrcnt.
1188 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1189 * the association id of the new association. On failure, sctp_connectx()
1190 * returns -1, and sets errno to the appropriate error code. The assoc_id
1191 * is not touched by the kernel.
1193 * For SCTP, the port given in each socket address must be the same, or
1194 * sctp_connectx() will fail, setting errno to EINVAL.
1196 * An application can use sctp_connectx to initiate an association with
1197 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1198 * allows a caller to specify multiple addresses at which a peer can be
1199 * reached. The way the SCTP stack uses the list of addresses to set up
1200 * the association is implementation dependent. This function only
1201 * specifies that the stack will try to make use of all the addresses in
1202 * the list when needed.
1204 * Note that the list of addresses passed in is only used for setting up
1205 * the association. It does not necessarily equal the set of addresses
1206 * the peer uses for the resulting association. If the caller wants to
1207 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1208 * retrieve them after the association has been set up.
1210 * Basically do nothing but copying the addresses from user to kernel
1211 * land and invoking either sctp_connectx(). This is used for tunneling
1212 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1214 * We don't use copy_from_user() for optimization: we first do the
1215 * sanity checks (buffer size -fast- and access check-healthy
1216 * pointer); if all of those succeed, then we can alloc the memory
1217 * (expensive operation) needed to copy the data to kernel. Then we do
1218 * the copying without checking the user space area
1219 * (__copy_from_user()).
1221 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1224 * sk The sk of the socket
1225 * addrs The pointer to the addresses in user land
1226 * addrssize Size of the addrs buffer
1228 * Returns >=0 if ok, <0 errno code on error.
1230 SCTP_STATIC
int __sctp_setsockopt_connectx(struct sock
* sk
,
1231 struct sockaddr __user
*addrs
,
1233 sctp_assoc_t
*assoc_id
)
1236 struct sockaddr
*kaddrs
;
1238 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1239 __func__
, sk
, addrs
, addrs_size
);
1241 if (unlikely(addrs_size
<= 0))
1244 /* Check the user passed a healthy pointer. */
1245 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1248 /* Alloc space for the address array in kernel memory. */
1249 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1250 if (unlikely(!kaddrs
))
1253 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1256 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, assoc_id
);
1265 * This is an older interface. It's kept for backward compatibility
1266 * to the option that doesn't provide association id.
1268 SCTP_STATIC
int sctp_setsockopt_connectx_old(struct sock
* sk
,
1269 struct sockaddr __user
*addrs
,
1272 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1276 * New interface for the API. The since the API is done with a socket
1277 * option, to make it simple we feed back the association id is as a return
1278 * indication to the call. Error is always negative and association id is
1281 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1282 struct sockaddr __user
*addrs
,
1285 sctp_assoc_t assoc_id
= 0;
1288 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1297 * New (hopefully final) interface for the API.
1298 * We use the sctp_getaddrs_old structure so that use-space library
1299 * can avoid any unnecessary allocations. The only defferent part
1300 * is that we store the actual length of the address buffer into the
1301 * addrs_num structure member. That way we can re-use the existing
1304 SCTP_STATIC
int sctp_getsockopt_connectx3(struct sock
* sk
, int len
,
1305 char __user
*optval
,
1308 struct sctp_getaddrs_old param
;
1309 sctp_assoc_t assoc_id
= 0;
1312 if (len
< sizeof(param
))
1315 if (copy_from_user(¶m
, optval
, sizeof(param
)))
1318 err
= __sctp_setsockopt_connectx(sk
,
1319 (struct sockaddr __user
*)param
.addrs
,
1320 param
.addr_num
, &assoc_id
);
1322 if (err
== 0 || err
== -EINPROGRESS
) {
1323 if (copy_to_user(optval
, &assoc_id
, sizeof(assoc_id
)))
1325 if (put_user(sizeof(assoc_id
), optlen
))
1332 /* API 3.1.4 close() - UDP Style Syntax
1333 * Applications use close() to perform graceful shutdown (as described in
1334 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1335 * by a UDP-style socket.
1339 * ret = close(int sd);
1341 * sd - the socket descriptor of the associations to be closed.
1343 * To gracefully shutdown a specific association represented by the
1344 * UDP-style socket, an application should use the sendmsg() call,
1345 * passing no user data, but including the appropriate flag in the
1346 * ancillary data (see Section xxxx).
1348 * If sd in the close() call is a branched-off socket representing only
1349 * one association, the shutdown is performed on that association only.
1351 * 4.1.6 close() - TCP Style Syntax
1353 * Applications use close() to gracefully close down an association.
1357 * int close(int sd);
1359 * sd - the socket descriptor of the association to be closed.
1361 * After an application calls close() on a socket descriptor, no further
1362 * socket operations will succeed on that descriptor.
1364 * API 7.1.4 SO_LINGER
1366 * An application using the TCP-style socket can use this option to
1367 * perform the SCTP ABORT primitive. The linger option structure is:
1370 * int l_onoff; // option on/off
1371 * int l_linger; // linger time
1374 * To enable the option, set l_onoff to 1. If the l_linger value is set
1375 * to 0, calling close() is the same as the ABORT primitive. If the
1376 * value is set to a negative value, the setsockopt() call will return
1377 * an error. If the value is set to a positive value linger_time, the
1378 * close() can be blocked for at most linger_time ms. If the graceful
1379 * shutdown phase does not finish during this period, close() will
1380 * return but the graceful shutdown phase continues in the system.
1382 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1384 struct sctp_endpoint
*ep
;
1385 struct sctp_association
*asoc
;
1386 struct list_head
*pos
, *temp
;
1387 unsigned int data_was_unread
;
1389 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1392 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1393 sk
->sk_state
= SCTP_SS_CLOSING
;
1395 ep
= sctp_sk(sk
)->ep
;
1397 /* Clean up any skbs sitting on the receive queue. */
1398 data_was_unread
= sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1399 data_was_unread
+= sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1401 /* Walk all associations on an endpoint. */
1402 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1403 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1405 if (sctp_style(sk
, TCP
)) {
1406 /* A closed association can still be in the list if
1407 * it belongs to a TCP-style listening socket that is
1408 * not yet accepted. If so, free it. If not, send an
1409 * ABORT or SHUTDOWN based on the linger options.
1411 if (sctp_state(asoc
, CLOSED
)) {
1412 sctp_unhash_established(asoc
);
1413 sctp_association_free(asoc
);
1418 if (data_was_unread
|| !skb_queue_empty(&asoc
->ulpq
.lobby
) ||
1419 !skb_queue_empty(&asoc
->ulpq
.reasm
) ||
1420 (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
)) {
1421 struct sctp_chunk
*chunk
;
1423 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1425 sctp_primitive_ABORT(asoc
, chunk
);
1427 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1430 /* On a TCP-style socket, block for at most linger_time if set. */
1431 if (sctp_style(sk
, TCP
) && timeout
)
1432 sctp_wait_for_close(sk
, timeout
);
1434 /* This will run the backlog queue. */
1435 sctp_release_sock(sk
);
1437 /* Supposedly, no process has access to the socket, but
1438 * the net layers still may.
1440 sctp_local_bh_disable();
1441 sctp_bh_lock_sock(sk
);
1443 /* Hold the sock, since sk_common_release() will put sock_put()
1444 * and we have just a little more cleanup.
1447 sk_common_release(sk
);
1449 sctp_bh_unlock_sock(sk
);
1450 sctp_local_bh_enable();
1454 SCTP_DBG_OBJCNT_DEC(sock
);
1457 /* Handle EPIPE error. */
1458 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1461 err
= sock_error(sk
) ? : -EPIPE
;
1462 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1463 send_sig(SIGPIPE
, current
, 0);
1467 /* API 3.1.3 sendmsg() - UDP Style Syntax
1469 * An application uses sendmsg() and recvmsg() calls to transmit data to
1470 * and receive data from its peer.
1472 * ssize_t sendmsg(int socket, const struct msghdr *message,
1475 * socket - the socket descriptor of the endpoint.
1476 * message - pointer to the msghdr structure which contains a single
1477 * user message and possibly some ancillary data.
1479 * See Section 5 for complete description of the data
1482 * flags - flags sent or received with the user message, see Section
1483 * 5 for complete description of the flags.
1485 * Note: This function could use a rewrite especially when explicit
1486 * connect support comes in.
1488 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1490 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1492 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1493 struct msghdr
*msg
, size_t msg_len
)
1495 struct sctp_sock
*sp
;
1496 struct sctp_endpoint
*ep
;
1497 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1498 struct sctp_transport
*transport
, *chunk_tp
;
1499 struct sctp_chunk
*chunk
;
1501 struct sockaddr
*msg_name
= NULL
;
1502 struct sctp_sndrcvinfo default_sinfo
;
1503 struct sctp_sndrcvinfo
*sinfo
;
1504 struct sctp_initmsg
*sinit
;
1505 sctp_assoc_t associd
= 0;
1506 sctp_cmsgs_t cmsgs
= { NULL
};
1510 __u16 sinfo_flags
= 0;
1511 struct sctp_datamsg
*datamsg
;
1512 int msg_flags
= msg
->msg_flags
;
1514 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1521 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1523 /* We cannot send a message over a TCP-style listening socket. */
1524 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1529 /* Parse out the SCTP CMSGs. */
1530 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1533 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1537 /* Fetch the destination address for this packet. This
1538 * address only selects the association--it is not necessarily
1539 * the address we will send to.
1540 * For a peeled-off socket, msg_name is ignored.
1542 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1543 int msg_namelen
= msg
->msg_namelen
;
1545 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1550 if (msg_namelen
> sizeof(to
))
1551 msg_namelen
= sizeof(to
);
1552 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1553 msg_name
= msg
->msg_name
;
1559 /* Did the user specify SNDRCVINFO? */
1561 sinfo_flags
= sinfo
->sinfo_flags
;
1562 associd
= sinfo
->sinfo_assoc_id
;
1565 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1566 msg_len
, sinfo_flags
);
1568 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1569 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1574 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1575 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1576 * If SCTP_ABORT is set, the message length could be non zero with
1577 * the msg_iov set to the user abort reason.
1579 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1580 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1585 /* If SCTP_ADDR_OVER is set, there must be an address
1586 * specified in msg_name.
1588 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1595 SCTP_DEBUG_PRINTK("About to look up association.\n");
1599 /* If a msg_name has been specified, assume this is to be used. */
1601 /* Look for a matching association on the endpoint. */
1602 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1604 /* If we could not find a matching association on the
1605 * endpoint, make sure that it is not a TCP-style
1606 * socket that already has an association or there is
1607 * no peeled-off association on another socket.
1609 if ((sctp_style(sk
, TCP
) &&
1610 sctp_sstate(sk
, ESTABLISHED
)) ||
1611 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1612 err
= -EADDRNOTAVAIL
;
1617 asoc
= sctp_id2assoc(sk
, associd
);
1625 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1627 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1628 * socket that has an association in CLOSED state. This can
1629 * happen when an accepted socket has an association that is
1632 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1637 if (sinfo_flags
& SCTP_EOF
) {
1638 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1640 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1644 if (sinfo_flags
& SCTP_ABORT
) {
1646 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1652 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1653 sctp_primitive_ABORT(asoc
, chunk
);
1659 /* Do we need to create the association? */
1661 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1663 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1668 /* Check for invalid stream against the stream counts,
1669 * either the default or the user specified stream counts.
1672 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1673 /* Check against the defaults. */
1674 if (sinfo
->sinfo_stream
>=
1675 sp
->initmsg
.sinit_num_ostreams
) {
1680 /* Check against the requested. */
1681 if (sinfo
->sinfo_stream
>=
1682 sinit
->sinit_num_ostreams
) {
1690 * API 3.1.2 bind() - UDP Style Syntax
1691 * If a bind() or sctp_bindx() is not called prior to a
1692 * sendmsg() call that initiates a new association, the
1693 * system picks an ephemeral port and will choose an address
1694 * set equivalent to binding with a wildcard address.
1696 if (!ep
->base
.bind_addr
.port
) {
1697 if (sctp_autobind(sk
)) {
1703 * If an unprivileged user inherits a one-to-many
1704 * style socket with open associations on a privileged
1705 * port, it MAY be permitted to accept new associations,
1706 * but it SHOULD NOT be permitted to open new
1709 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1710 !capable(CAP_NET_BIND_SERVICE
)) {
1716 scope
= sctp_scope(&to
);
1717 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1723 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
, GFP_KERNEL
);
1729 /* If the SCTP_INIT ancillary data is specified, set all
1730 * the association init values accordingly.
1733 if (sinit
->sinit_num_ostreams
) {
1734 asoc
->c
.sinit_num_ostreams
=
1735 sinit
->sinit_num_ostreams
;
1737 if (sinit
->sinit_max_instreams
) {
1738 asoc
->c
.sinit_max_instreams
=
1739 sinit
->sinit_max_instreams
;
1741 if (sinit
->sinit_max_attempts
) {
1742 asoc
->max_init_attempts
1743 = sinit
->sinit_max_attempts
;
1745 if (sinit
->sinit_max_init_timeo
) {
1746 asoc
->max_init_timeo
=
1747 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1751 /* Prime the peer's transport structures. */
1752 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1759 /* ASSERT: we have a valid association at this point. */
1760 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1763 /* If the user didn't specify SNDRCVINFO, make up one with
1766 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1767 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1768 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1769 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1770 default_sinfo
.sinfo_context
= asoc
->default_context
;
1771 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1772 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1773 sinfo
= &default_sinfo
;
1776 /* API 7.1.7, the sndbuf size per association bounds the
1777 * maximum size of data that can be sent in a single send call.
1779 if (msg_len
> sk
->sk_sndbuf
) {
1784 if (asoc
->pmtu_pending
)
1785 sctp_assoc_pending_pmtu(asoc
);
1787 /* If fragmentation is disabled and the message length exceeds the
1788 * association fragmentation point, return EMSGSIZE. The I-D
1789 * does not specify what this error is, but this looks like
1792 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1797 /* Check for invalid stream. */
1798 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1803 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1804 if (!sctp_wspace(asoc
)) {
1805 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1810 /* If an address is passed with the sendto/sendmsg call, it is used
1811 * to override the primary destination address in the TCP model, or
1812 * when SCTP_ADDR_OVER flag is set in the UDP model.
1814 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1815 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1816 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1824 /* Auto-connect, if we aren't connected already. */
1825 if (sctp_state(asoc
, CLOSED
)) {
1826 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1829 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1832 /* Break the message into multiple chunks of maximum size. */
1833 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1839 /* Now send the (possibly) fragmented message. */
1840 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1841 sctp_chunk_hold(chunk
);
1843 /* Do accounting for the write space. */
1844 sctp_set_owner_w(chunk
);
1846 chunk
->transport
= chunk_tp
;
1849 /* Send it to the lower layers. Note: all chunks
1850 * must either fail or succeed. The lower layer
1851 * works that way today. Keep it that way or this
1854 err
= sctp_primitive_SEND(asoc
, datamsg
);
1855 /* Did the lower layer accept the chunk? */
1857 sctp_datamsg_free(datamsg
);
1859 sctp_datamsg_put(datamsg
);
1861 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1868 /* If we are already past ASSOCIATE, the lower
1869 * layers are responsible for association cleanup.
1875 sctp_association_free(asoc
);
1877 sctp_release_sock(sk
);
1880 return sctp_error(sk
, msg_flags
, err
);
1887 err
= sock_error(sk
);
1897 /* This is an extended version of skb_pull() that removes the data from the
1898 * start of a skb even when data is spread across the list of skb's in the
1899 * frag_list. len specifies the total amount of data that needs to be removed.
1900 * when 'len' bytes could be removed from the skb, it returns 0.
1901 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1902 * could not be removed.
1904 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1906 struct sk_buff
*list
;
1907 int skb_len
= skb_headlen(skb
);
1910 if (len
<= skb_len
) {
1911 __skb_pull(skb
, len
);
1915 __skb_pull(skb
, skb_len
);
1917 skb_walk_frags(skb
, list
) {
1918 rlen
= sctp_skb_pull(list
, len
);
1919 skb
->len
-= (len
-rlen
);
1920 skb
->data_len
-= (len
-rlen
);
1931 /* API 3.1.3 recvmsg() - UDP Style Syntax
1933 * ssize_t recvmsg(int socket, struct msghdr *message,
1936 * socket - the socket descriptor of the endpoint.
1937 * message - pointer to the msghdr structure which contains a single
1938 * user message and possibly some ancillary data.
1940 * See Section 5 for complete description of the data
1943 * flags - flags sent or received with the user message, see Section
1944 * 5 for complete description of the flags.
1946 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1948 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1949 struct msghdr
*msg
, size_t len
, int noblock
,
1950 int flags
, int *addr_len
)
1952 struct sctp_ulpevent
*event
= NULL
;
1953 struct sctp_sock
*sp
= sctp_sk(sk
);
1954 struct sk_buff
*skb
;
1959 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1960 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1961 "len", len
, "knoblauch", noblock
,
1962 "flags", flags
, "addr_len", addr_len
);
1966 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1971 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1975 /* Get the total length of the skb including any skb's in the
1984 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1986 event
= sctp_skb2event(skb
);
1991 sock_recv_ts_and_drops(msg
, sk
, skb
);
1992 if (sctp_ulpevent_is_notification(event
)) {
1993 msg
->msg_flags
|= MSG_NOTIFICATION
;
1994 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1996 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1999 /* Check if we allow SCTP_SNDRCVINFO. */
2000 if (sp
->subscribe
.sctp_data_io_event
)
2001 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
2003 /* FIXME: we should be calling IP/IPv6 layers. */
2004 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
2005 ip_cmsg_recv(msg
, skb
);
2010 /* If skb's length exceeds the user's buffer, update the skb and
2011 * push it back to the receive_queue so that the next call to
2012 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2014 if (skb_len
> copied
) {
2015 msg
->msg_flags
&= ~MSG_EOR
;
2016 if (flags
& MSG_PEEK
)
2018 sctp_skb_pull(skb
, copied
);
2019 skb_queue_head(&sk
->sk_receive_queue
, skb
);
2021 /* When only partial message is copied to the user, increase
2022 * rwnd by that amount. If all the data in the skb is read,
2023 * rwnd is updated when the event is freed.
2025 if (!sctp_ulpevent_is_notification(event
))
2026 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
2028 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
2029 (event
->msg_flags
& MSG_EOR
))
2030 msg
->msg_flags
|= MSG_EOR
;
2032 msg
->msg_flags
&= ~MSG_EOR
;
2035 if (flags
& MSG_PEEK
) {
2036 /* Release the skb reference acquired after peeking the skb in
2037 * sctp_skb_recv_datagram().
2041 /* Free the event which includes releasing the reference to
2042 * the owner of the skb, freeing the skb and updating the
2045 sctp_ulpevent_free(event
);
2048 sctp_release_sock(sk
);
2052 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2054 * This option is a on/off flag. If enabled no SCTP message
2055 * fragmentation will be performed. Instead if a message being sent
2056 * exceeds the current PMTU size, the message will NOT be sent and
2057 * instead a error will be indicated to the user.
2059 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
2060 char __user
*optval
,
2061 unsigned int optlen
)
2065 if (optlen
< sizeof(int))
2068 if (get_user(val
, (int __user
*)optval
))
2071 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
2076 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2077 unsigned int optlen
)
2079 struct sctp_association
*asoc
;
2080 struct sctp_ulpevent
*event
;
2082 if (optlen
> sizeof(struct sctp_event_subscribe
))
2084 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2088 * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2089 * if there is no data to be sent or retransmit, the stack will
2090 * immediately send up this notification.
2092 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT
,
2093 &sctp_sk(sk
)->subscribe
)) {
2094 asoc
= sctp_id2assoc(sk
, 0);
2096 if (asoc
&& sctp_outq_is_empty(&asoc
->outqueue
)) {
2097 event
= sctp_ulpevent_make_sender_dry_event(asoc
,
2102 sctp_ulpq_tail_event(&asoc
->ulpq
, event
);
2109 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2111 * This socket option is applicable to the UDP-style socket only. When
2112 * set it will cause associations that are idle for more than the
2113 * specified number of seconds to automatically close. An association
2114 * being idle is defined an association that has NOT sent or received
2115 * user data. The special value of '0' indicates that no automatic
2116 * close of any associations should be performed. The option expects an
2117 * integer defining the number of seconds of idle time before an
2118 * association is closed.
2120 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2121 unsigned int optlen
)
2123 struct sctp_sock
*sp
= sctp_sk(sk
);
2125 /* Applicable to UDP-style socket only */
2126 if (sctp_style(sk
, TCP
))
2128 if (optlen
!= sizeof(int))
2130 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2132 /* make sure it won't exceed MAX_SCHEDULE_TIMEOUT */
2133 sp
->autoclose
= min_t(long, sp
->autoclose
, MAX_SCHEDULE_TIMEOUT
/ HZ
);
2138 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2140 * Applications can enable or disable heartbeats for any peer address of
2141 * an association, modify an address's heartbeat interval, force a
2142 * heartbeat to be sent immediately, and adjust the address's maximum
2143 * number of retransmissions sent before an address is considered
2144 * unreachable. The following structure is used to access and modify an
2145 * address's parameters:
2147 * struct sctp_paddrparams {
2148 * sctp_assoc_t spp_assoc_id;
2149 * struct sockaddr_storage spp_address;
2150 * uint32_t spp_hbinterval;
2151 * uint16_t spp_pathmaxrxt;
2152 * uint32_t spp_pathmtu;
2153 * uint32_t spp_sackdelay;
2154 * uint32_t spp_flags;
2157 * spp_assoc_id - (one-to-many style socket) This is filled in the
2158 * application, and identifies the association for
2160 * spp_address - This specifies which address is of interest.
2161 * spp_hbinterval - This contains the value of the heartbeat interval,
2162 * in milliseconds. If a value of zero
2163 * is present in this field then no changes are to
2164 * be made to this parameter.
2165 * spp_pathmaxrxt - This contains the maximum number of
2166 * retransmissions before this address shall be
2167 * considered unreachable. If a value of zero
2168 * is present in this field then no changes are to
2169 * be made to this parameter.
2170 * spp_pathmtu - When Path MTU discovery is disabled the value
2171 * specified here will be the "fixed" path mtu.
2172 * Note that if the spp_address field is empty
2173 * then all associations on this address will
2174 * have this fixed path mtu set upon them.
2176 * spp_sackdelay - When delayed sack is enabled, this value specifies
2177 * the number of milliseconds that sacks will be delayed
2178 * for. This value will apply to all addresses of an
2179 * association if the spp_address field is empty. Note
2180 * also, that if delayed sack is enabled and this
2181 * value is set to 0, no change is made to the last
2182 * recorded delayed sack timer value.
2184 * spp_flags - These flags are used to control various features
2185 * on an association. The flag field may contain
2186 * zero or more of the following options.
2188 * SPP_HB_ENABLE - Enable heartbeats on the
2189 * specified address. Note that if the address
2190 * field is empty all addresses for the association
2191 * have heartbeats enabled upon them.
2193 * SPP_HB_DISABLE - Disable heartbeats on the
2194 * speicifed address. Note that if the address
2195 * field is empty all addresses for the association
2196 * will have their heartbeats disabled. Note also
2197 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2198 * mutually exclusive, only one of these two should
2199 * be specified. Enabling both fields will have
2200 * undetermined results.
2202 * SPP_HB_DEMAND - Request a user initiated heartbeat
2203 * to be made immediately.
2205 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2206 * heartbeat delayis to be set to the value of 0
2209 * SPP_PMTUD_ENABLE - This field will enable PMTU
2210 * discovery upon the specified address. Note that
2211 * if the address feild is empty then all addresses
2212 * on the association are effected.
2214 * SPP_PMTUD_DISABLE - This field will disable PMTU
2215 * discovery upon the specified address. Note that
2216 * if the address feild is empty then all addresses
2217 * on the association are effected. Not also that
2218 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2219 * exclusive. Enabling both will have undetermined
2222 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2223 * on delayed sack. The time specified in spp_sackdelay
2224 * is used to specify the sack delay for this address. Note
2225 * that if spp_address is empty then all addresses will
2226 * enable delayed sack and take on the sack delay
2227 * value specified in spp_sackdelay.
2228 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2229 * off delayed sack. If the spp_address field is blank then
2230 * delayed sack is disabled for the entire association. Note
2231 * also that this field is mutually exclusive to
2232 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2235 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2236 struct sctp_transport
*trans
,
2237 struct sctp_association
*asoc
,
2238 struct sctp_sock
*sp
,
2241 int sackdelay_change
)
2245 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2246 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2251 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2252 * this field is ignored. Note also that a value of zero indicates
2253 * the current setting should be left unchanged.
2255 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2257 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2258 * set. This lets us use 0 value when this flag
2261 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2262 params
->spp_hbinterval
= 0;
2264 if (params
->spp_hbinterval
||
2265 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2268 msecs_to_jiffies(params
->spp_hbinterval
);
2271 msecs_to_jiffies(params
->spp_hbinterval
);
2273 sp
->hbinterval
= params
->spp_hbinterval
;
2280 trans
->param_flags
=
2281 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2284 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2287 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2291 /* When Path MTU discovery is disabled the value specified here will
2292 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2293 * include the flag SPP_PMTUD_DISABLE for this field to have any
2296 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2298 trans
->pathmtu
= params
->spp_pathmtu
;
2299 sctp_assoc_sync_pmtu(asoc
);
2301 asoc
->pathmtu
= params
->spp_pathmtu
;
2302 sctp_frag_point(asoc
, params
->spp_pathmtu
);
2304 sp
->pathmtu
= params
->spp_pathmtu
;
2310 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2311 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2312 trans
->param_flags
=
2313 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2315 sctp_transport_pmtu(trans
, sctp_opt2sk(sp
));
2316 sctp_assoc_sync_pmtu(asoc
);
2320 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2323 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2327 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2328 * value of this field is ignored. Note also that a value of zero
2329 * indicates the current setting should be left unchanged.
2331 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2334 msecs_to_jiffies(params
->spp_sackdelay
);
2337 msecs_to_jiffies(params
->spp_sackdelay
);
2339 sp
->sackdelay
= params
->spp_sackdelay
;
2343 if (sackdelay_change
) {
2345 trans
->param_flags
=
2346 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2350 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2354 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2359 /* Note that a value of zero indicates the current setting should be
2362 if (params
->spp_pathmaxrxt
) {
2364 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2366 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2368 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2375 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2376 char __user
*optval
,
2377 unsigned int optlen
)
2379 struct sctp_paddrparams params
;
2380 struct sctp_transport
*trans
= NULL
;
2381 struct sctp_association
*asoc
= NULL
;
2382 struct sctp_sock
*sp
= sctp_sk(sk
);
2384 int hb_change
, pmtud_change
, sackdelay_change
;
2386 if (optlen
!= sizeof(struct sctp_paddrparams
))
2389 if (copy_from_user(¶ms
, optval
, optlen
))
2392 /* Validate flags and value parameters. */
2393 hb_change
= params
.spp_flags
& SPP_HB
;
2394 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2395 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2397 if (hb_change
== SPP_HB
||
2398 pmtud_change
== SPP_PMTUD
||
2399 sackdelay_change
== SPP_SACKDELAY
||
2400 params
.spp_sackdelay
> 500 ||
2401 (params
.spp_pathmtu
&&
2402 params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2405 /* If an address other than INADDR_ANY is specified, and
2406 * no transport is found, then the request is invalid.
2408 if (!sctp_is_any(sk
, ( union sctp_addr
*)¶ms
.spp_address
)) {
2409 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2410 params
.spp_assoc_id
);
2415 /* Get association, if assoc_id != 0 and the socket is a one
2416 * to many style socket, and an association was not found, then
2417 * the id was invalid.
2419 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2420 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2423 /* Heartbeat demand can only be sent on a transport or
2424 * association, but not a socket.
2426 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2429 /* Process parameters. */
2430 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2431 hb_change
, pmtud_change
,
2437 /* If changes are for association, also apply parameters to each
2440 if (!trans
&& asoc
) {
2441 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2443 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2444 hb_change
, pmtud_change
,
2453 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2455 * This option will effect the way delayed acks are performed. This
2456 * option allows you to get or set the delayed ack time, in
2457 * milliseconds. It also allows changing the delayed ack frequency.
2458 * Changing the frequency to 1 disables the delayed sack algorithm. If
2459 * the assoc_id is 0, then this sets or gets the endpoints default
2460 * values. If the assoc_id field is non-zero, then the set or get
2461 * effects the specified association for the one to many model (the
2462 * assoc_id field is ignored by the one to one model). Note that if
2463 * sack_delay or sack_freq are 0 when setting this option, then the
2464 * current values will remain unchanged.
2466 * struct sctp_sack_info {
2467 * sctp_assoc_t sack_assoc_id;
2468 * uint32_t sack_delay;
2469 * uint32_t sack_freq;
2472 * sack_assoc_id - This parameter, indicates which association the user
2473 * is performing an action upon. Note that if this field's value is
2474 * zero then the endpoints default value is changed (effecting future
2475 * associations only).
2477 * sack_delay - This parameter contains the number of milliseconds that
2478 * the user is requesting the delayed ACK timer be set to. Note that
2479 * this value is defined in the standard to be between 200 and 500
2482 * sack_freq - This parameter contains the number of packets that must
2483 * be received before a sack is sent without waiting for the delay
2484 * timer to expire. The default value for this is 2, setting this
2485 * value to 1 will disable the delayed sack algorithm.
2488 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2489 char __user
*optval
, unsigned int optlen
)
2491 struct sctp_sack_info params
;
2492 struct sctp_transport
*trans
= NULL
;
2493 struct sctp_association
*asoc
= NULL
;
2494 struct sctp_sock
*sp
= sctp_sk(sk
);
2496 if (optlen
== sizeof(struct sctp_sack_info
)) {
2497 if (copy_from_user(¶ms
, optval
, optlen
))
2500 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2502 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2503 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2504 pr_warn("Use struct sctp_sack_info instead\n");
2505 if (copy_from_user(¶ms
, optval
, optlen
))
2508 if (params
.sack_delay
== 0)
2509 params
.sack_freq
= 1;
2511 params
.sack_freq
= 0;
2515 /* Validate value parameter. */
2516 if (params
.sack_delay
> 500)
2519 /* Get association, if sack_assoc_id != 0 and the socket is a one
2520 * to many style socket, and an association was not found, then
2521 * the id was invalid.
2523 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2524 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2527 if (params
.sack_delay
) {
2530 msecs_to_jiffies(params
.sack_delay
);
2532 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2533 SPP_SACKDELAY_ENABLE
;
2535 sp
->sackdelay
= params
.sack_delay
;
2537 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2538 SPP_SACKDELAY_ENABLE
;
2542 if (params
.sack_freq
== 1) {
2545 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2546 SPP_SACKDELAY_DISABLE
;
2549 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2550 SPP_SACKDELAY_DISABLE
;
2552 } else if (params
.sack_freq
> 1) {
2554 asoc
->sackfreq
= params
.sack_freq
;
2556 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2557 SPP_SACKDELAY_ENABLE
;
2559 sp
->sackfreq
= params
.sack_freq
;
2561 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2562 SPP_SACKDELAY_ENABLE
;
2566 /* If change is for association, also apply to each transport. */
2568 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2570 if (params
.sack_delay
) {
2572 msecs_to_jiffies(params
.sack_delay
);
2573 trans
->param_flags
=
2574 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2575 SPP_SACKDELAY_ENABLE
;
2577 if (params
.sack_freq
== 1) {
2578 trans
->param_flags
=
2579 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2580 SPP_SACKDELAY_DISABLE
;
2581 } else if (params
.sack_freq
> 1) {
2582 trans
->sackfreq
= params
.sack_freq
;
2583 trans
->param_flags
=
2584 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2585 SPP_SACKDELAY_ENABLE
;
2593 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2595 * Applications can specify protocol parameters for the default association
2596 * initialization. The option name argument to setsockopt() and getsockopt()
2599 * Setting initialization parameters is effective only on an unconnected
2600 * socket (for UDP-style sockets only future associations are effected
2601 * by the change). With TCP-style sockets, this option is inherited by
2602 * sockets derived from a listener socket.
2604 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2606 struct sctp_initmsg sinit
;
2607 struct sctp_sock
*sp
= sctp_sk(sk
);
2609 if (optlen
!= sizeof(struct sctp_initmsg
))
2611 if (copy_from_user(&sinit
, optval
, optlen
))
2614 if (sinit
.sinit_num_ostreams
)
2615 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2616 if (sinit
.sinit_max_instreams
)
2617 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2618 if (sinit
.sinit_max_attempts
)
2619 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2620 if (sinit
.sinit_max_init_timeo
)
2621 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2627 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2629 * Applications that wish to use the sendto() system call may wish to
2630 * specify a default set of parameters that would normally be supplied
2631 * through the inclusion of ancillary data. This socket option allows
2632 * such an application to set the default sctp_sndrcvinfo structure.
2633 * The application that wishes to use this socket option simply passes
2634 * in to this call the sctp_sndrcvinfo structure defined in Section
2635 * 5.2.2) The input parameters accepted by this call include
2636 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2637 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2638 * to this call if the caller is using the UDP model.
2640 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2641 char __user
*optval
,
2642 unsigned int optlen
)
2644 struct sctp_sndrcvinfo info
;
2645 struct sctp_association
*asoc
;
2646 struct sctp_sock
*sp
= sctp_sk(sk
);
2648 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2650 if (copy_from_user(&info
, optval
, optlen
))
2653 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2654 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2658 asoc
->default_stream
= info
.sinfo_stream
;
2659 asoc
->default_flags
= info
.sinfo_flags
;
2660 asoc
->default_ppid
= info
.sinfo_ppid
;
2661 asoc
->default_context
= info
.sinfo_context
;
2662 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2664 sp
->default_stream
= info
.sinfo_stream
;
2665 sp
->default_flags
= info
.sinfo_flags
;
2666 sp
->default_ppid
= info
.sinfo_ppid
;
2667 sp
->default_context
= info
.sinfo_context
;
2668 sp
->default_timetolive
= info
.sinfo_timetolive
;
2674 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2676 * Requests that the local SCTP stack use the enclosed peer address as
2677 * the association primary. The enclosed address must be one of the
2678 * association peer's addresses.
2680 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2681 unsigned int optlen
)
2683 struct sctp_prim prim
;
2684 struct sctp_transport
*trans
;
2686 if (optlen
!= sizeof(struct sctp_prim
))
2689 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2692 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2696 sctp_assoc_set_primary(trans
->asoc
, trans
);
2702 * 7.1.5 SCTP_NODELAY
2704 * Turn on/off any Nagle-like algorithm. This means that packets are
2705 * generally sent as soon as possible and no unnecessary delays are
2706 * introduced, at the cost of more packets in the network. Expects an
2707 * integer boolean flag.
2709 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2710 unsigned int optlen
)
2714 if (optlen
< sizeof(int))
2716 if (get_user(val
, (int __user
*)optval
))
2719 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2725 * 7.1.1 SCTP_RTOINFO
2727 * The protocol parameters used to initialize and bound retransmission
2728 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2729 * and modify these parameters.
2730 * All parameters are time values, in milliseconds. A value of 0, when
2731 * modifying the parameters, indicates that the current value should not
2735 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2737 struct sctp_rtoinfo rtoinfo
;
2738 struct sctp_association
*asoc
;
2740 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2743 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2746 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2748 /* Set the values to the specific association */
2749 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2753 if (rtoinfo
.srto_initial
!= 0)
2755 msecs_to_jiffies(rtoinfo
.srto_initial
);
2756 if (rtoinfo
.srto_max
!= 0)
2757 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2758 if (rtoinfo
.srto_min
!= 0)
2759 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2761 /* If there is no association or the association-id = 0
2762 * set the values to the endpoint.
2764 struct sctp_sock
*sp
= sctp_sk(sk
);
2766 if (rtoinfo
.srto_initial
!= 0)
2767 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2768 if (rtoinfo
.srto_max
!= 0)
2769 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2770 if (rtoinfo
.srto_min
!= 0)
2771 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2779 * 7.1.2 SCTP_ASSOCINFO
2781 * This option is used to tune the maximum retransmission attempts
2782 * of the association.
2783 * Returns an error if the new association retransmission value is
2784 * greater than the sum of the retransmission value of the peer.
2785 * See [SCTP] for more information.
2788 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2791 struct sctp_assocparams assocparams
;
2792 struct sctp_association
*asoc
;
2794 if (optlen
!= sizeof(struct sctp_assocparams
))
2796 if (copy_from_user(&assocparams
, optval
, optlen
))
2799 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2801 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2804 /* Set the values to the specific association */
2806 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2809 struct sctp_transport
*peer_addr
;
2811 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
2813 path_sum
+= peer_addr
->pathmaxrxt
;
2817 /* Only validate asocmaxrxt if we have more than
2818 * one path/transport. We do this because path
2819 * retransmissions are only counted when we have more
2823 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2826 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2829 if (assocparams
.sasoc_cookie_life
!= 0) {
2830 asoc
->cookie_life
.tv_sec
=
2831 assocparams
.sasoc_cookie_life
/ 1000;
2832 asoc
->cookie_life
.tv_usec
=
2833 (assocparams
.sasoc_cookie_life
% 1000)
2837 /* Set the values to the endpoint */
2838 struct sctp_sock
*sp
= sctp_sk(sk
);
2840 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2841 sp
->assocparams
.sasoc_asocmaxrxt
=
2842 assocparams
.sasoc_asocmaxrxt
;
2843 if (assocparams
.sasoc_cookie_life
!= 0)
2844 sp
->assocparams
.sasoc_cookie_life
=
2845 assocparams
.sasoc_cookie_life
;
2851 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2853 * This socket option is a boolean flag which turns on or off mapped V4
2854 * addresses. If this option is turned on and the socket is type
2855 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2856 * If this option is turned off, then no mapping will be done of V4
2857 * addresses and a user will receive both PF_INET6 and PF_INET type
2858 * addresses on the socket.
2860 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2863 struct sctp_sock
*sp
= sctp_sk(sk
);
2865 if (optlen
< sizeof(int))
2867 if (get_user(val
, (int __user
*)optval
))
2878 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2879 * This option will get or set the maximum size to put in any outgoing
2880 * SCTP DATA chunk. If a message is larger than this size it will be
2881 * fragmented by SCTP into the specified size. Note that the underlying
2882 * SCTP implementation may fragment into smaller sized chunks when the
2883 * PMTU of the underlying association is smaller than the value set by
2884 * the user. The default value for this option is '0' which indicates
2885 * the user is NOT limiting fragmentation and only the PMTU will effect
2886 * SCTP's choice of DATA chunk size. Note also that values set larger
2887 * than the maximum size of an IP datagram will effectively let SCTP
2888 * control fragmentation (i.e. the same as setting this option to 0).
2890 * The following structure is used to access and modify this parameter:
2892 * struct sctp_assoc_value {
2893 * sctp_assoc_t assoc_id;
2894 * uint32_t assoc_value;
2897 * assoc_id: This parameter is ignored for one-to-one style sockets.
2898 * For one-to-many style sockets this parameter indicates which
2899 * association the user is performing an action upon. Note that if
2900 * this field's value is zero then the endpoints default value is
2901 * changed (effecting future associations only).
2902 * assoc_value: This parameter specifies the maximum size in bytes.
2904 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2906 struct sctp_assoc_value params
;
2907 struct sctp_association
*asoc
;
2908 struct sctp_sock
*sp
= sctp_sk(sk
);
2911 if (optlen
== sizeof(int)) {
2912 pr_warn("Use of int in maxseg socket option deprecated\n");
2913 pr_warn("Use struct sctp_assoc_value instead\n");
2914 if (copy_from_user(&val
, optval
, optlen
))
2916 params
.assoc_id
= 0;
2917 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2918 if (copy_from_user(¶ms
, optval
, optlen
))
2920 val
= params
.assoc_value
;
2924 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2927 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2928 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
2933 val
= asoc
->pathmtu
;
2934 val
-= sp
->pf
->af
->net_header_len
;
2935 val
-= sizeof(struct sctphdr
) +
2936 sizeof(struct sctp_data_chunk
);
2938 asoc
->user_frag
= val
;
2939 asoc
->frag_point
= sctp_frag_point(asoc
, asoc
->pathmtu
);
2941 sp
->user_frag
= val
;
2949 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2951 * Requests that the peer mark the enclosed address as the association
2952 * primary. The enclosed address must be one of the association's
2953 * locally bound addresses. The following structure is used to make a
2954 * set primary request:
2956 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2957 unsigned int optlen
)
2959 struct sctp_sock
*sp
;
2960 struct sctp_association
*asoc
= NULL
;
2961 struct sctp_setpeerprim prim
;
2962 struct sctp_chunk
*chunk
;
2968 if (!sctp_addip_enable
)
2971 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2974 if (copy_from_user(&prim
, optval
, optlen
))
2977 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2981 if (!asoc
->peer
.asconf_capable
)
2984 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2987 if (!sctp_state(asoc
, ESTABLISHED
))
2990 af
= sctp_get_af_specific(prim
.sspp_addr
.ss_family
);
2994 if (!af
->addr_valid((union sctp_addr
*)&prim
.sspp_addr
, sp
, NULL
))
2995 return -EADDRNOTAVAIL
;
2997 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2998 return -EADDRNOTAVAIL
;
3000 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3001 chunk
= sctp_make_asconf_set_prim(asoc
,
3002 (union sctp_addr
*)&prim
.sspp_addr
);
3006 err
= sctp_send_asconf(asoc
, chunk
);
3008 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
3013 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
3014 unsigned int optlen
)
3016 struct sctp_setadaptation adaptation
;
3018 if (optlen
!= sizeof(struct sctp_setadaptation
))
3020 if (copy_from_user(&adaptation
, optval
, optlen
))
3023 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
3029 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3031 * The context field in the sctp_sndrcvinfo structure is normally only
3032 * used when a failed message is retrieved holding the value that was
3033 * sent down on the actual send call. This option allows the setting of
3034 * a default context on an association basis that will be received on
3035 * reading messages from the peer. This is especially helpful in the
3036 * one-2-many model for an application to keep some reference to an
3037 * internal state machine that is processing messages on the
3038 * association. Note that the setting of this value only effects
3039 * received messages from the peer and does not effect the value that is
3040 * saved with outbound messages.
3042 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
3043 unsigned int optlen
)
3045 struct sctp_assoc_value params
;
3046 struct sctp_sock
*sp
;
3047 struct sctp_association
*asoc
;
3049 if (optlen
!= sizeof(struct sctp_assoc_value
))
3051 if (copy_from_user(¶ms
, optval
, optlen
))
3056 if (params
.assoc_id
!= 0) {
3057 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3060 asoc
->default_rcv_context
= params
.assoc_value
;
3062 sp
->default_rcv_context
= params
.assoc_value
;
3069 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3071 * This options will at a minimum specify if the implementation is doing
3072 * fragmented interleave. Fragmented interleave, for a one to many
3073 * socket, is when subsequent calls to receive a message may return
3074 * parts of messages from different associations. Some implementations
3075 * may allow you to turn this value on or off. If so, when turned off,
3076 * no fragment interleave will occur (which will cause a head of line
3077 * blocking amongst multiple associations sharing the same one to many
3078 * socket). When this option is turned on, then each receive call may
3079 * come from a different association (thus the user must receive data
3080 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3081 * association each receive belongs to.
3083 * This option takes a boolean value. A non-zero value indicates that
3084 * fragmented interleave is on. A value of zero indicates that
3085 * fragmented interleave is off.
3087 * Note that it is important that an implementation that allows this
3088 * option to be turned on, have it off by default. Otherwise an unaware
3089 * application using the one to many model may become confused and act
3092 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
3093 char __user
*optval
,
3094 unsigned int optlen
)
3098 if (optlen
!= sizeof(int))
3100 if (get_user(val
, (int __user
*)optval
))
3103 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
3109 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3110 * (SCTP_PARTIAL_DELIVERY_POINT)
3112 * This option will set or get the SCTP partial delivery point. This
3113 * point is the size of a message where the partial delivery API will be
3114 * invoked to help free up rwnd space for the peer. Setting this to a
3115 * lower value will cause partial deliveries to happen more often. The
3116 * calls argument is an integer that sets or gets the partial delivery
3117 * point. Note also that the call will fail if the user attempts to set
3118 * this value larger than the socket receive buffer size.
3120 * Note that any single message having a length smaller than or equal to
3121 * the SCTP partial delivery point will be delivered in one single read
3122 * call as long as the user provided buffer is large enough to hold the
3125 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
3126 char __user
*optval
,
3127 unsigned int optlen
)
3131 if (optlen
!= sizeof(u32
))
3133 if (get_user(val
, (int __user
*)optval
))
3136 /* Note: We double the receive buffer from what the user sets
3137 * it to be, also initial rwnd is based on rcvbuf/2.
3139 if (val
> (sk
->sk_rcvbuf
>> 1))
3142 sctp_sk(sk
)->pd_point
= val
;
3144 return 0; /* is this the right error code? */
3148 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3150 * This option will allow a user to change the maximum burst of packets
3151 * that can be emitted by this association. Note that the default value
3152 * is 4, and some implementations may restrict this setting so that it
3153 * can only be lowered.
3155 * NOTE: This text doesn't seem right. Do this on a socket basis with
3156 * future associations inheriting the socket value.
3158 static int sctp_setsockopt_maxburst(struct sock
*sk
,
3159 char __user
*optval
,
3160 unsigned int optlen
)
3162 struct sctp_assoc_value params
;
3163 struct sctp_sock
*sp
;
3164 struct sctp_association
*asoc
;
3168 if (optlen
== sizeof(int)) {
3169 pr_warn("Use of int in max_burst socket option deprecated\n");
3170 pr_warn("Use struct sctp_assoc_value instead\n");
3171 if (copy_from_user(&val
, optval
, optlen
))
3173 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3174 if (copy_from_user(¶ms
, optval
, optlen
))
3176 val
= params
.assoc_value
;
3177 assoc_id
= params
.assoc_id
;
3183 if (assoc_id
!= 0) {
3184 asoc
= sctp_id2assoc(sk
, assoc_id
);
3187 asoc
->max_burst
= val
;
3189 sp
->max_burst
= val
;
3195 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3197 * This set option adds a chunk type that the user is requesting to be
3198 * received only in an authenticated way. Changes to the list of chunks
3199 * will only effect future associations on the socket.
3201 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
3202 char __user
*optval
,
3203 unsigned int optlen
)
3205 struct sctp_authchunk val
;
3207 if (!sctp_auth_enable
)
3210 if (optlen
!= sizeof(struct sctp_authchunk
))
3212 if (copy_from_user(&val
, optval
, optlen
))
3215 switch (val
.sauth_chunk
) {
3217 case SCTP_CID_INIT_ACK
:
3218 case SCTP_CID_SHUTDOWN_COMPLETE
:
3223 /* add this chunk id to the endpoint */
3224 return sctp_auth_ep_add_chunkid(sctp_sk(sk
)->ep
, val
.sauth_chunk
);
3228 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3230 * This option gets or sets the list of HMAC algorithms that the local
3231 * endpoint requires the peer to use.
3233 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
3234 char __user
*optval
,
3235 unsigned int optlen
)
3237 struct sctp_hmacalgo
*hmacs
;
3241 if (!sctp_auth_enable
)
3244 if (optlen
< sizeof(struct sctp_hmacalgo
))
3247 hmacs
= memdup_user(optval
, optlen
);
3249 return PTR_ERR(hmacs
);
3251 idents
= hmacs
->shmac_num_idents
;
3252 if (idents
== 0 || idents
> SCTP_AUTH_NUM_HMACS
||
3253 (idents
* sizeof(u16
)) > (optlen
- sizeof(struct sctp_hmacalgo
))) {
3258 err
= sctp_auth_ep_set_hmacs(sctp_sk(sk
)->ep
, hmacs
);
3265 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3267 * This option will set a shared secret key which is used to build an
3268 * association shared key.
3270 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3271 char __user
*optval
,
3272 unsigned int optlen
)
3274 struct sctp_authkey
*authkey
;
3275 struct sctp_association
*asoc
;
3278 if (!sctp_auth_enable
)
3281 if (optlen
<= sizeof(struct sctp_authkey
))
3284 authkey
= memdup_user(optval
, optlen
);
3285 if (IS_ERR(authkey
))
3286 return PTR_ERR(authkey
);
3288 if (authkey
->sca_keylength
> optlen
- sizeof(struct sctp_authkey
)) {
3293 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3294 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3299 ret
= sctp_auth_set_key(sctp_sk(sk
)->ep
, asoc
, authkey
);
3306 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3308 * This option will get or set the active shared key to be used to build
3309 * the association shared key.
3311 static int sctp_setsockopt_active_key(struct sock
*sk
,
3312 char __user
*optval
,
3313 unsigned int optlen
)
3315 struct sctp_authkeyid val
;
3316 struct sctp_association
*asoc
;
3318 if (!sctp_auth_enable
)
3321 if (optlen
!= sizeof(struct sctp_authkeyid
))
3323 if (copy_from_user(&val
, optval
, optlen
))
3326 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3327 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3330 return sctp_auth_set_active_key(sctp_sk(sk
)->ep
, asoc
,
3331 val
.scact_keynumber
);
3335 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3337 * This set option will delete a shared secret key from use.
3339 static int sctp_setsockopt_del_key(struct sock
*sk
,
3340 char __user
*optval
,
3341 unsigned int optlen
)
3343 struct sctp_authkeyid val
;
3344 struct sctp_association
*asoc
;
3346 if (!sctp_auth_enable
)
3349 if (optlen
!= sizeof(struct sctp_authkeyid
))
3351 if (copy_from_user(&val
, optval
, optlen
))
3354 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3355 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3358 return sctp_auth_del_key_id(sctp_sk(sk
)->ep
, asoc
,
3359 val
.scact_keynumber
);
3364 /* API 6.2 setsockopt(), getsockopt()
3366 * Applications use setsockopt() and getsockopt() to set or retrieve
3367 * socket options. Socket options are used to change the default
3368 * behavior of sockets calls. They are described in Section 7.
3372 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3373 * int __user *optlen);
3374 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3377 * sd - the socket descript.
3378 * level - set to IPPROTO_SCTP for all SCTP options.
3379 * optname - the option name.
3380 * optval - the buffer to store the value of the option.
3381 * optlen - the size of the buffer.
3383 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3384 char __user
*optval
, unsigned int optlen
)
3388 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3391 /* I can hardly begin to describe how wrong this is. This is
3392 * so broken as to be worse than useless. The API draft
3393 * REALLY is NOT helpful here... I am not convinced that the
3394 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3395 * are at all well-founded.
3397 if (level
!= SOL_SCTP
) {
3398 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3399 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3406 case SCTP_SOCKOPT_BINDX_ADD
:
3407 /* 'optlen' is the size of the addresses buffer. */
3408 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3409 optlen
, SCTP_BINDX_ADD_ADDR
);
3412 case SCTP_SOCKOPT_BINDX_REM
:
3413 /* 'optlen' is the size of the addresses buffer. */
3414 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3415 optlen
, SCTP_BINDX_REM_ADDR
);
3418 case SCTP_SOCKOPT_CONNECTX_OLD
:
3419 /* 'optlen' is the size of the addresses buffer. */
3420 retval
= sctp_setsockopt_connectx_old(sk
,
3421 (struct sockaddr __user
*)optval
,
3425 case SCTP_SOCKOPT_CONNECTX
:
3426 /* 'optlen' is the size of the addresses buffer. */
3427 retval
= sctp_setsockopt_connectx(sk
,
3428 (struct sockaddr __user
*)optval
,
3432 case SCTP_DISABLE_FRAGMENTS
:
3433 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3437 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3440 case SCTP_AUTOCLOSE
:
3441 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3444 case SCTP_PEER_ADDR_PARAMS
:
3445 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3448 case SCTP_DELAYED_SACK
:
3449 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3451 case SCTP_PARTIAL_DELIVERY_POINT
:
3452 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3456 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3458 case SCTP_DEFAULT_SEND_PARAM
:
3459 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3462 case SCTP_PRIMARY_ADDR
:
3463 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3465 case SCTP_SET_PEER_PRIMARY_ADDR
:
3466 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3469 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3472 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3474 case SCTP_ASSOCINFO
:
3475 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3477 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3478 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3481 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3483 case SCTP_ADAPTATION_LAYER
:
3484 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3487 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3489 case SCTP_FRAGMENT_INTERLEAVE
:
3490 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3492 case SCTP_MAX_BURST
:
3493 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3495 case SCTP_AUTH_CHUNK
:
3496 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3498 case SCTP_HMAC_IDENT
:
3499 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3502 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3504 case SCTP_AUTH_ACTIVE_KEY
:
3505 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3507 case SCTP_AUTH_DELETE_KEY
:
3508 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3511 retval
= -ENOPROTOOPT
;
3515 sctp_release_sock(sk
);
3521 /* API 3.1.6 connect() - UDP Style Syntax
3523 * An application may use the connect() call in the UDP model to initiate an
3524 * association without sending data.
3528 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3530 * sd: the socket descriptor to have a new association added to.
3532 * nam: the address structure (either struct sockaddr_in or struct
3533 * sockaddr_in6 defined in RFC2553 [7]).
3535 * len: the size of the address.
3537 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3545 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3546 __func__
, sk
, addr
, addr_len
);
3548 /* Validate addr_len before calling common connect/connectx routine. */
3549 af
= sctp_get_af_specific(addr
->sa_family
);
3550 if (!af
|| addr_len
< af
->sockaddr_len
) {
3553 /* Pass correct addr len to common routine (so it knows there
3554 * is only one address being passed.
3556 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
3559 sctp_release_sock(sk
);
3563 /* FIXME: Write comments. */
3564 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
3566 return -EOPNOTSUPP
; /* STUB */
3569 /* 4.1.4 accept() - TCP Style Syntax
3571 * Applications use accept() call to remove an established SCTP
3572 * association from the accept queue of the endpoint. A new socket
3573 * descriptor will be returned from accept() to represent the newly
3574 * formed association.
3576 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3578 struct sctp_sock
*sp
;
3579 struct sctp_endpoint
*ep
;
3580 struct sock
*newsk
= NULL
;
3581 struct sctp_association
*asoc
;
3590 if (!sctp_style(sk
, TCP
)) {
3591 error
= -EOPNOTSUPP
;
3595 if (!sctp_sstate(sk
, LISTENING
)) {
3600 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3602 error
= sctp_wait_for_accept(sk
, timeo
);
3606 /* We treat the list of associations on the endpoint as the accept
3607 * queue and pick the first association on the list.
3609 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3611 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3617 /* Populate the fields of the newsk from the oldsk and migrate the
3618 * asoc to the newsk.
3620 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3623 sctp_release_sock(sk
);
3628 /* The SCTP ioctl handler. */
3629 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3636 * SEQPACKET-style sockets in LISTENING state are valid, for
3637 * SCTP, so only discard TCP-style sockets in LISTENING state.
3639 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
3644 struct sk_buff
*skb
;
3645 unsigned int amount
= 0;
3647 skb
= skb_peek(&sk
->sk_receive_queue
);
3650 * We will only return the amount of this packet since
3651 * that is all that will be read.
3655 rc
= put_user(amount
, (int __user
*)arg
);
3663 sctp_release_sock(sk
);
3667 /* This is the function which gets called during socket creation to
3668 * initialized the SCTP-specific portion of the sock.
3669 * The sock structure should already be zero-filled memory.
3671 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
3673 struct sctp_endpoint
*ep
;
3674 struct sctp_sock
*sp
;
3676 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3680 /* Initialize the SCTP per socket area. */
3681 switch (sk
->sk_type
) {
3682 case SOCK_SEQPACKET
:
3683 sp
->type
= SCTP_SOCKET_UDP
;
3686 sp
->type
= SCTP_SOCKET_TCP
;
3689 return -ESOCKTNOSUPPORT
;
3692 /* Initialize default send parameters. These parameters can be
3693 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3695 sp
->default_stream
= 0;
3696 sp
->default_ppid
= 0;
3697 sp
->default_flags
= 0;
3698 sp
->default_context
= 0;
3699 sp
->default_timetolive
= 0;
3701 sp
->default_rcv_context
= 0;
3702 sp
->max_burst
= sctp_max_burst
;
3704 /* Initialize default setup parameters. These parameters
3705 * can be modified with the SCTP_INITMSG socket option or
3706 * overridden by the SCTP_INIT CMSG.
3708 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3709 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3710 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3711 sp
->initmsg
.sinit_max_init_timeo
= sctp_rto_max
;
3713 /* Initialize default RTO related parameters. These parameters can
3714 * be modified for with the SCTP_RTOINFO socket option.
3716 sp
->rtoinfo
.srto_initial
= sctp_rto_initial
;
3717 sp
->rtoinfo
.srto_max
= sctp_rto_max
;
3718 sp
->rtoinfo
.srto_min
= sctp_rto_min
;
3720 /* Initialize default association related parameters. These parameters
3721 * can be modified with the SCTP_ASSOCINFO socket option.
3723 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3724 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3725 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3726 sp
->assocparams
.sasoc_local_rwnd
= 0;
3727 sp
->assocparams
.sasoc_cookie_life
= sctp_valid_cookie_life
;
3729 /* Initialize default event subscriptions. By default, all the
3732 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3734 /* Default Peer Address Parameters. These defaults can
3735 * be modified via SCTP_PEER_ADDR_PARAMS
3737 sp
->hbinterval
= sctp_hb_interval
;
3738 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3739 sp
->pathmtu
= 0; // allow default discovery
3740 sp
->sackdelay
= sctp_sack_timeout
;
3742 sp
->param_flags
= SPP_HB_ENABLE
|
3744 SPP_SACKDELAY_ENABLE
;
3746 /* If enabled no SCTP message fragmentation will be performed.
3747 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3749 sp
->disable_fragments
= 0;
3751 /* Enable Nagle algorithm by default. */
3754 /* Enable by default. */
3757 /* Auto-close idle associations after the configured
3758 * number of seconds. A value of 0 disables this
3759 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3760 * for UDP-style sockets only.
3764 /* User specified fragmentation limit. */
3767 sp
->adaptation_ind
= 0;
3769 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3771 /* Control variables for partial data delivery. */
3772 atomic_set(&sp
->pd_mode
, 0);
3773 skb_queue_head_init(&sp
->pd_lobby
);
3774 sp
->frag_interleave
= 0;
3776 /* Create a per socket endpoint structure. Even if we
3777 * change the data structure relationships, this may still
3778 * be useful for storing pre-connect address information.
3780 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3787 SCTP_DBG_OBJCNT_INC(sock
);
3790 percpu_counter_inc(&sctp_sockets_allocated
);
3791 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, 1);
3797 /* Cleanup any SCTP per socket resources. */
3798 SCTP_STATIC
void sctp_destroy_sock(struct sock
*sk
)
3800 struct sctp_endpoint
*ep
;
3802 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3804 /* Release our hold on the endpoint. */
3805 ep
= sctp_sk(sk
)->ep
;
3806 sctp_endpoint_free(ep
);
3808 percpu_counter_dec(&sctp_sockets_allocated
);
3809 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
3813 /* API 4.1.7 shutdown() - TCP Style Syntax
3814 * int shutdown(int socket, int how);
3816 * sd - the socket descriptor of the association to be closed.
3817 * how - Specifies the type of shutdown. The values are
3820 * Disables further receive operations. No SCTP
3821 * protocol action is taken.
3823 * Disables further send operations, and initiates
3824 * the SCTP shutdown sequence.
3826 * Disables further send and receive operations
3827 * and initiates the SCTP shutdown sequence.
3829 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3831 struct sctp_endpoint
*ep
;
3832 struct sctp_association
*asoc
;
3834 if (!sctp_style(sk
, TCP
))
3837 if (how
& SEND_SHUTDOWN
) {
3838 ep
= sctp_sk(sk
)->ep
;
3839 if (!list_empty(&ep
->asocs
)) {
3840 asoc
= list_entry(ep
->asocs
.next
,
3841 struct sctp_association
, asocs
);
3842 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3847 /* 7.2.1 Association Status (SCTP_STATUS)
3849 * Applications can retrieve current status information about an
3850 * association, including association state, peer receiver window size,
3851 * number of unacked data chunks, and number of data chunks pending
3852 * receipt. This information is read-only.
3854 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3855 char __user
*optval
,
3858 struct sctp_status status
;
3859 struct sctp_association
*asoc
= NULL
;
3860 struct sctp_transport
*transport
;
3861 sctp_assoc_t associd
;
3864 if (len
< sizeof(status
)) {
3869 len
= sizeof(status
);
3870 if (copy_from_user(&status
, optval
, len
)) {
3875 associd
= status
.sstat_assoc_id
;
3876 asoc
= sctp_id2assoc(sk
, associd
);
3882 transport
= asoc
->peer
.primary_path
;
3884 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3885 status
.sstat_state
= asoc
->state
;
3886 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3887 status
.sstat_unackdata
= asoc
->unack_data
;
3889 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3890 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3891 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3892 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3893 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3894 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
3895 transport
->af_specific
->sockaddr_len
);
3896 /* Map ipv4 address into v4-mapped-on-v6 address. */
3897 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3898 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3899 status
.sstat_primary
.spinfo_state
= transport
->state
;
3900 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3901 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3902 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3903 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3905 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3906 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3908 if (put_user(len
, optlen
)) {
3913 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3914 len
, status
.sstat_state
, status
.sstat_rwnd
,
3915 status
.sstat_assoc_id
);
3917 if (copy_to_user(optval
, &status
, len
)) {
3927 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3929 * Applications can retrieve information about a specific peer address
3930 * of an association, including its reachability state, congestion
3931 * window, and retransmission timer values. This information is
3934 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3935 char __user
*optval
,
3938 struct sctp_paddrinfo pinfo
;
3939 struct sctp_transport
*transport
;
3942 if (len
< sizeof(pinfo
)) {
3947 len
= sizeof(pinfo
);
3948 if (copy_from_user(&pinfo
, optval
, len
)) {
3953 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3954 pinfo
.spinfo_assoc_id
);
3958 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3959 pinfo
.spinfo_state
= transport
->state
;
3960 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3961 pinfo
.spinfo_srtt
= transport
->srtt
;
3962 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3963 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3965 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3966 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3968 if (put_user(len
, optlen
)) {
3973 if (copy_to_user(optval
, &pinfo
, len
)) {
3982 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3984 * This option is a on/off flag. If enabled no SCTP message
3985 * fragmentation will be performed. Instead if a message being sent
3986 * exceeds the current PMTU size, the message will NOT be sent and
3987 * instead a error will be indicated to the user.
3989 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3990 char __user
*optval
, int __user
*optlen
)
3994 if (len
< sizeof(int))
3998 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3999 if (put_user(len
, optlen
))
4001 if (copy_to_user(optval
, &val
, len
))
4006 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4008 * This socket option is used to specify various notifications and
4009 * ancillary data the user wishes to receive.
4011 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
4014 if (len
< sizeof(struct sctp_event_subscribe
))
4016 len
= sizeof(struct sctp_event_subscribe
);
4017 if (put_user(len
, optlen
))
4019 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
4024 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4026 * This socket option is applicable to the UDP-style socket only. When
4027 * set it will cause associations that are idle for more than the
4028 * specified number of seconds to automatically close. An association
4029 * being idle is defined an association that has NOT sent or received
4030 * user data. The special value of '0' indicates that no automatic
4031 * close of any associations should be performed. The option expects an
4032 * integer defining the number of seconds of idle time before an
4033 * association is closed.
4035 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4037 /* Applicable to UDP-style socket only */
4038 if (sctp_style(sk
, TCP
))
4040 if (len
< sizeof(int))
4043 if (put_user(len
, optlen
))
4045 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
4050 /* Helper routine to branch off an association to a new socket. */
4051 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
4052 struct socket
**sockp
)
4054 struct sock
*sk
= asoc
->base
.sk
;
4055 struct socket
*sock
;
4059 /* An association cannot be branched off from an already peeled-off
4060 * socket, nor is this supported for tcp style sockets.
4062 if (!sctp_style(sk
, UDP
))
4065 /* Create a new socket. */
4066 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
4070 sctp_copy_sock(sock
->sk
, sk
, asoc
);
4072 /* Make peeled-off sockets more like 1-1 accepted sockets.
4073 * Set the daddr and initialize id to something more random
4075 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
4076 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
4078 /* Populate the fields of the newsk from the oldsk and migrate the
4079 * asoc to the newsk.
4081 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
4088 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4090 sctp_peeloff_arg_t peeloff
;
4091 struct socket
*newsock
;
4093 struct sctp_association
*asoc
;
4095 if (len
< sizeof(sctp_peeloff_arg_t
))
4097 len
= sizeof(sctp_peeloff_arg_t
);
4098 if (copy_from_user(&peeloff
, optval
, len
))
4101 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
4107 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__
, sk
, asoc
);
4109 retval
= sctp_do_peeloff(asoc
, &newsock
);
4113 /* Map the socket to an unused fd that can be returned to the user. */
4114 retval
= sock_map_fd(newsock
, 0);
4116 sock_release(newsock
);
4120 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
4121 __func__
, sk
, asoc
, newsock
->sk
, retval
);
4123 /* Return the fd mapped to the new socket. */
4124 peeloff
.sd
= retval
;
4125 if (put_user(len
, optlen
))
4127 if (copy_to_user(optval
, &peeloff
, len
))
4134 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4136 * Applications can enable or disable heartbeats for any peer address of
4137 * an association, modify an address's heartbeat interval, force a
4138 * heartbeat to be sent immediately, and adjust the address's maximum
4139 * number of retransmissions sent before an address is considered
4140 * unreachable. The following structure is used to access and modify an
4141 * address's parameters:
4143 * struct sctp_paddrparams {
4144 * sctp_assoc_t spp_assoc_id;
4145 * struct sockaddr_storage spp_address;
4146 * uint32_t spp_hbinterval;
4147 * uint16_t spp_pathmaxrxt;
4148 * uint32_t spp_pathmtu;
4149 * uint32_t spp_sackdelay;
4150 * uint32_t spp_flags;
4153 * spp_assoc_id - (one-to-many style socket) This is filled in the
4154 * application, and identifies the association for
4156 * spp_address - This specifies which address is of interest.
4157 * spp_hbinterval - This contains the value of the heartbeat interval,
4158 * in milliseconds. If a value of zero
4159 * is present in this field then no changes are to
4160 * be made to this parameter.
4161 * spp_pathmaxrxt - This contains the maximum number of
4162 * retransmissions before this address shall be
4163 * considered unreachable. If a value of zero
4164 * is present in this field then no changes are to
4165 * be made to this parameter.
4166 * spp_pathmtu - When Path MTU discovery is disabled the value
4167 * specified here will be the "fixed" path mtu.
4168 * Note that if the spp_address field is empty
4169 * then all associations on this address will
4170 * have this fixed path mtu set upon them.
4172 * spp_sackdelay - When delayed sack is enabled, this value specifies
4173 * the number of milliseconds that sacks will be delayed
4174 * for. This value will apply to all addresses of an
4175 * association if the spp_address field is empty. Note
4176 * also, that if delayed sack is enabled and this
4177 * value is set to 0, no change is made to the last
4178 * recorded delayed sack timer value.
4180 * spp_flags - These flags are used to control various features
4181 * on an association. The flag field may contain
4182 * zero or more of the following options.
4184 * SPP_HB_ENABLE - Enable heartbeats on the
4185 * specified address. Note that if the address
4186 * field is empty all addresses for the association
4187 * have heartbeats enabled upon them.
4189 * SPP_HB_DISABLE - Disable heartbeats on the
4190 * speicifed address. Note that if the address
4191 * field is empty all addresses for the association
4192 * will have their heartbeats disabled. Note also
4193 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4194 * mutually exclusive, only one of these two should
4195 * be specified. Enabling both fields will have
4196 * undetermined results.
4198 * SPP_HB_DEMAND - Request a user initiated heartbeat
4199 * to be made immediately.
4201 * SPP_PMTUD_ENABLE - This field will enable PMTU
4202 * discovery upon the specified address. Note that
4203 * if the address feild is empty then all addresses
4204 * on the association are effected.
4206 * SPP_PMTUD_DISABLE - This field will disable PMTU
4207 * discovery upon the specified address. Note that
4208 * if the address feild is empty then all addresses
4209 * on the association are effected. Not also that
4210 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4211 * exclusive. Enabling both will have undetermined
4214 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4215 * on delayed sack. The time specified in spp_sackdelay
4216 * is used to specify the sack delay for this address. Note
4217 * that if spp_address is empty then all addresses will
4218 * enable delayed sack and take on the sack delay
4219 * value specified in spp_sackdelay.
4220 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4221 * off delayed sack. If the spp_address field is blank then
4222 * delayed sack is disabled for the entire association. Note
4223 * also that this field is mutually exclusive to
4224 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4227 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
4228 char __user
*optval
, int __user
*optlen
)
4230 struct sctp_paddrparams params
;
4231 struct sctp_transport
*trans
= NULL
;
4232 struct sctp_association
*asoc
= NULL
;
4233 struct sctp_sock
*sp
= sctp_sk(sk
);
4235 if (len
< sizeof(struct sctp_paddrparams
))
4237 len
= sizeof(struct sctp_paddrparams
);
4238 if (copy_from_user(¶ms
, optval
, len
))
4241 /* If an address other than INADDR_ANY is specified, and
4242 * no transport is found, then the request is invalid.
4244 if (!sctp_is_any(sk
, ( union sctp_addr
*)¶ms
.spp_address
)) {
4245 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
4246 params
.spp_assoc_id
);
4248 SCTP_DEBUG_PRINTK("Failed no transport\n");
4253 /* Get association, if assoc_id != 0 and the socket is a one
4254 * to many style socket, and an association was not found, then
4255 * the id was invalid.
4257 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
4258 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
4259 SCTP_DEBUG_PRINTK("Failed no association\n");
4264 /* Fetch transport values. */
4265 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
4266 params
.spp_pathmtu
= trans
->pathmtu
;
4267 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
4268 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
4270 /*draft-11 doesn't say what to return in spp_flags*/
4271 params
.spp_flags
= trans
->param_flags
;
4273 /* Fetch association values. */
4274 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
4275 params
.spp_pathmtu
= asoc
->pathmtu
;
4276 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
4277 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
4279 /*draft-11 doesn't say what to return in spp_flags*/
4280 params
.spp_flags
= asoc
->param_flags
;
4282 /* Fetch socket values. */
4283 params
.spp_hbinterval
= sp
->hbinterval
;
4284 params
.spp_pathmtu
= sp
->pathmtu
;
4285 params
.spp_sackdelay
= sp
->sackdelay
;
4286 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
4288 /*draft-11 doesn't say what to return in spp_flags*/
4289 params
.spp_flags
= sp
->param_flags
;
4292 if (copy_to_user(optval
, ¶ms
, len
))
4295 if (put_user(len
, optlen
))
4302 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4304 * This option will effect the way delayed acks are performed. This
4305 * option allows you to get or set the delayed ack time, in
4306 * milliseconds. It also allows changing the delayed ack frequency.
4307 * Changing the frequency to 1 disables the delayed sack algorithm. If
4308 * the assoc_id is 0, then this sets or gets the endpoints default
4309 * values. If the assoc_id field is non-zero, then the set or get
4310 * effects the specified association for the one to many model (the
4311 * assoc_id field is ignored by the one to one model). Note that if
4312 * sack_delay or sack_freq are 0 when setting this option, then the
4313 * current values will remain unchanged.
4315 * struct sctp_sack_info {
4316 * sctp_assoc_t sack_assoc_id;
4317 * uint32_t sack_delay;
4318 * uint32_t sack_freq;
4321 * sack_assoc_id - This parameter, indicates which association the user
4322 * is performing an action upon. Note that if this field's value is
4323 * zero then the endpoints default value is changed (effecting future
4324 * associations only).
4326 * sack_delay - This parameter contains the number of milliseconds that
4327 * the user is requesting the delayed ACK timer be set to. Note that
4328 * this value is defined in the standard to be between 200 and 500
4331 * sack_freq - This parameter contains the number of packets that must
4332 * be received before a sack is sent without waiting for the delay
4333 * timer to expire. The default value for this is 2, setting this
4334 * value to 1 will disable the delayed sack algorithm.
4336 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
4337 char __user
*optval
,
4340 struct sctp_sack_info params
;
4341 struct sctp_association
*asoc
= NULL
;
4342 struct sctp_sock
*sp
= sctp_sk(sk
);
4344 if (len
>= sizeof(struct sctp_sack_info
)) {
4345 len
= sizeof(struct sctp_sack_info
);
4347 if (copy_from_user(¶ms
, optval
, len
))
4349 } else if (len
== sizeof(struct sctp_assoc_value
)) {
4350 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4351 pr_warn("Use struct sctp_sack_info instead\n");
4352 if (copy_from_user(¶ms
, optval
, len
))
4357 /* Get association, if sack_assoc_id != 0 and the socket is a one
4358 * to many style socket, and an association was not found, then
4359 * the id was invalid.
4361 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
4362 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
4366 /* Fetch association values. */
4367 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4368 params
.sack_delay
= jiffies_to_msecs(
4370 params
.sack_freq
= asoc
->sackfreq
;
4373 params
.sack_delay
= 0;
4374 params
.sack_freq
= 1;
4377 /* Fetch socket values. */
4378 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4379 params
.sack_delay
= sp
->sackdelay
;
4380 params
.sack_freq
= sp
->sackfreq
;
4382 params
.sack_delay
= 0;
4383 params
.sack_freq
= 1;
4387 if (copy_to_user(optval
, ¶ms
, len
))
4390 if (put_user(len
, optlen
))
4396 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4398 * Applications can specify protocol parameters for the default association
4399 * initialization. The option name argument to setsockopt() and getsockopt()
4402 * Setting initialization parameters is effective only on an unconnected
4403 * socket (for UDP-style sockets only future associations are effected
4404 * by the change). With TCP-style sockets, this option is inherited by
4405 * sockets derived from a listener socket.
4407 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4409 if (len
< sizeof(struct sctp_initmsg
))
4411 len
= sizeof(struct sctp_initmsg
);
4412 if (put_user(len
, optlen
))
4414 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
4420 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4421 char __user
*optval
, int __user
*optlen
)
4423 struct sctp_association
*asoc
;
4425 struct sctp_getaddrs getaddrs
;
4426 struct sctp_transport
*from
;
4428 union sctp_addr temp
;
4429 struct sctp_sock
*sp
= sctp_sk(sk
);
4434 if (len
< sizeof(struct sctp_getaddrs
))
4437 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4440 /* For UDP-style sockets, id specifies the association to query. */
4441 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4445 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4446 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4448 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
4450 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4451 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4452 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4453 if (space_left
< addrlen
)
4455 if (copy_to_user(to
, &temp
, addrlen
))
4459 space_left
-= addrlen
;
4462 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4464 bytes_copied
= ((char __user
*)to
) - optval
;
4465 if (put_user(bytes_copied
, optlen
))
4471 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4472 size_t space_left
, int *bytes_copied
)
4474 struct sctp_sockaddr_entry
*addr
;
4475 union sctp_addr temp
;
4480 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
4484 if ((PF_INET
== sk
->sk_family
) &&
4485 (AF_INET6
== addr
->a
.sa
.sa_family
))
4487 if ((PF_INET6
== sk
->sk_family
) &&
4488 inet_v6_ipv6only(sk
) &&
4489 (AF_INET
== addr
->a
.sa
.sa_family
))
4491 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4492 if (!temp
.v4
.sin_port
)
4493 temp
.v4
.sin_port
= htons(port
);
4495 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4497 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4498 if (space_left
< addrlen
) {
4502 memcpy(to
, &temp
, addrlen
);
4506 space_left
-= addrlen
;
4507 *bytes_copied
+= addrlen
;
4515 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4516 char __user
*optval
, int __user
*optlen
)
4518 struct sctp_bind_addr
*bp
;
4519 struct sctp_association
*asoc
;
4521 struct sctp_getaddrs getaddrs
;
4522 struct sctp_sockaddr_entry
*addr
;
4524 union sctp_addr temp
;
4525 struct sctp_sock
*sp
= sctp_sk(sk
);
4529 int bytes_copied
= 0;
4533 if (len
< sizeof(struct sctp_getaddrs
))
4536 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4540 * For UDP-style sockets, id specifies the association to query.
4541 * If the id field is set to the value '0' then the locally bound
4542 * addresses are returned without regard to any particular
4545 if (0 == getaddrs
.assoc_id
) {
4546 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4548 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4551 bp
= &asoc
->base
.bind_addr
;
4554 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4555 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4557 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4561 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4562 * addresses from the global local address list.
4564 if (sctp_list_single_entry(&bp
->address_list
)) {
4565 addr
= list_entry(bp
->address_list
.next
,
4566 struct sctp_sockaddr_entry
, list
);
4567 if (sctp_is_any(sk
, &addr
->a
)) {
4568 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4569 space_left
, &bytes_copied
);
4579 /* Protection on the bound address list is not needed since
4580 * in the socket option context we hold a socket lock and
4581 * thus the bound address list can't change.
4583 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4584 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4585 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4586 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4587 if (space_left
< addrlen
) {
4588 err
= -ENOMEM
; /*fixme: right error?*/
4591 memcpy(buf
, &temp
, addrlen
);
4593 bytes_copied
+= addrlen
;
4595 space_left
-= addrlen
;
4599 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4603 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4607 if (put_user(bytes_copied
, optlen
))
4614 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4616 * Requests that the local SCTP stack use the enclosed peer address as
4617 * the association primary. The enclosed address must be one of the
4618 * association peer's addresses.
4620 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4621 char __user
*optval
, int __user
*optlen
)
4623 struct sctp_prim prim
;
4624 struct sctp_association
*asoc
;
4625 struct sctp_sock
*sp
= sctp_sk(sk
);
4627 if (len
< sizeof(struct sctp_prim
))
4630 len
= sizeof(struct sctp_prim
);
4632 if (copy_from_user(&prim
, optval
, len
))
4635 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4639 if (!asoc
->peer
.primary_path
)
4642 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4643 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4645 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4646 (union sctp_addr
*)&prim
.ssp_addr
);
4648 if (put_user(len
, optlen
))
4650 if (copy_to_user(optval
, &prim
, len
))
4657 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4659 * Requests that the local endpoint set the specified Adaptation Layer
4660 * Indication parameter for all future INIT and INIT-ACK exchanges.
4662 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4663 char __user
*optval
, int __user
*optlen
)
4665 struct sctp_setadaptation adaptation
;
4667 if (len
< sizeof(struct sctp_setadaptation
))
4670 len
= sizeof(struct sctp_setadaptation
);
4672 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4674 if (put_user(len
, optlen
))
4676 if (copy_to_user(optval
, &adaptation
, len
))
4684 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4686 * Applications that wish to use the sendto() system call may wish to
4687 * specify a default set of parameters that would normally be supplied
4688 * through the inclusion of ancillary data. This socket option allows
4689 * such an application to set the default sctp_sndrcvinfo structure.
4692 * The application that wishes to use this socket option simply passes
4693 * in to this call the sctp_sndrcvinfo structure defined in Section
4694 * 5.2.2) The input parameters accepted by this call include
4695 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4696 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4697 * to this call if the caller is using the UDP model.
4699 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4701 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4702 int len
, char __user
*optval
,
4705 struct sctp_sndrcvinfo info
;
4706 struct sctp_association
*asoc
;
4707 struct sctp_sock
*sp
= sctp_sk(sk
);
4709 if (len
< sizeof(struct sctp_sndrcvinfo
))
4712 len
= sizeof(struct sctp_sndrcvinfo
);
4714 if (copy_from_user(&info
, optval
, len
))
4717 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4718 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4722 info
.sinfo_stream
= asoc
->default_stream
;
4723 info
.sinfo_flags
= asoc
->default_flags
;
4724 info
.sinfo_ppid
= asoc
->default_ppid
;
4725 info
.sinfo_context
= asoc
->default_context
;
4726 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4728 info
.sinfo_stream
= sp
->default_stream
;
4729 info
.sinfo_flags
= sp
->default_flags
;
4730 info
.sinfo_ppid
= sp
->default_ppid
;
4731 info
.sinfo_context
= sp
->default_context
;
4732 info
.sinfo_timetolive
= sp
->default_timetolive
;
4735 if (put_user(len
, optlen
))
4737 if (copy_to_user(optval
, &info
, len
))
4745 * 7.1.5 SCTP_NODELAY
4747 * Turn on/off any Nagle-like algorithm. This means that packets are
4748 * generally sent as soon as possible and no unnecessary delays are
4749 * introduced, at the cost of more packets in the network. Expects an
4750 * integer boolean flag.
4753 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4754 char __user
*optval
, int __user
*optlen
)
4758 if (len
< sizeof(int))
4762 val
= (sctp_sk(sk
)->nodelay
== 1);
4763 if (put_user(len
, optlen
))
4765 if (copy_to_user(optval
, &val
, len
))
4772 * 7.1.1 SCTP_RTOINFO
4774 * The protocol parameters used to initialize and bound retransmission
4775 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4776 * and modify these parameters.
4777 * All parameters are time values, in milliseconds. A value of 0, when
4778 * modifying the parameters, indicates that the current value should not
4782 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4783 char __user
*optval
,
4784 int __user
*optlen
) {
4785 struct sctp_rtoinfo rtoinfo
;
4786 struct sctp_association
*asoc
;
4788 if (len
< sizeof (struct sctp_rtoinfo
))
4791 len
= sizeof(struct sctp_rtoinfo
);
4793 if (copy_from_user(&rtoinfo
, optval
, len
))
4796 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4798 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4801 /* Values corresponding to the specific association. */
4803 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4804 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4805 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4807 /* Values corresponding to the endpoint. */
4808 struct sctp_sock
*sp
= sctp_sk(sk
);
4810 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4811 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4812 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4815 if (put_user(len
, optlen
))
4818 if (copy_to_user(optval
, &rtoinfo
, len
))
4826 * 7.1.2 SCTP_ASSOCINFO
4828 * This option is used to tune the maximum retransmission attempts
4829 * of the association.
4830 * Returns an error if the new association retransmission value is
4831 * greater than the sum of the retransmission value of the peer.
4832 * See [SCTP] for more information.
4835 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4836 char __user
*optval
,
4840 struct sctp_assocparams assocparams
;
4841 struct sctp_association
*asoc
;
4842 struct list_head
*pos
;
4845 if (len
< sizeof (struct sctp_assocparams
))
4848 len
= sizeof(struct sctp_assocparams
);
4850 if (copy_from_user(&assocparams
, optval
, len
))
4853 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4855 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4858 /* Values correspoinding to the specific association */
4860 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4861 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4862 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4863 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4865 (asoc
->cookie_life
.tv_usec
4868 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4872 assocparams
.sasoc_number_peer_destinations
= cnt
;
4874 /* Values corresponding to the endpoint */
4875 struct sctp_sock
*sp
= sctp_sk(sk
);
4877 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4878 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4879 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4880 assocparams
.sasoc_cookie_life
=
4881 sp
->assocparams
.sasoc_cookie_life
;
4882 assocparams
.sasoc_number_peer_destinations
=
4884 sasoc_number_peer_destinations
;
4887 if (put_user(len
, optlen
))
4890 if (copy_to_user(optval
, &assocparams
, len
))
4897 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4899 * This socket option is a boolean flag which turns on or off mapped V4
4900 * addresses. If this option is turned on and the socket is type
4901 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4902 * If this option is turned off, then no mapping will be done of V4
4903 * addresses and a user will receive both PF_INET6 and PF_INET type
4904 * addresses on the socket.
4906 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
4907 char __user
*optval
, int __user
*optlen
)
4910 struct sctp_sock
*sp
= sctp_sk(sk
);
4912 if (len
< sizeof(int))
4917 if (put_user(len
, optlen
))
4919 if (copy_to_user(optval
, &val
, len
))
4926 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
4927 * (chapter and verse is quoted at sctp_setsockopt_context())
4929 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
4930 char __user
*optval
, int __user
*optlen
)
4932 struct sctp_assoc_value params
;
4933 struct sctp_sock
*sp
;
4934 struct sctp_association
*asoc
;
4936 if (len
< sizeof(struct sctp_assoc_value
))
4939 len
= sizeof(struct sctp_assoc_value
);
4941 if (copy_from_user(¶ms
, optval
, len
))
4946 if (params
.assoc_id
!= 0) {
4947 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4950 params
.assoc_value
= asoc
->default_rcv_context
;
4952 params
.assoc_value
= sp
->default_rcv_context
;
4955 if (put_user(len
, optlen
))
4957 if (copy_to_user(optval
, ¶ms
, len
))
4964 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
4965 * This option will get or set the maximum size to put in any outgoing
4966 * SCTP DATA chunk. If a message is larger than this size it will be
4967 * fragmented by SCTP into the specified size. Note that the underlying
4968 * SCTP implementation may fragment into smaller sized chunks when the
4969 * PMTU of the underlying association is smaller than the value set by
4970 * the user. The default value for this option is '0' which indicates
4971 * the user is NOT limiting fragmentation and only the PMTU will effect
4972 * SCTP's choice of DATA chunk size. Note also that values set larger
4973 * than the maximum size of an IP datagram will effectively let SCTP
4974 * control fragmentation (i.e. the same as setting this option to 0).
4976 * The following structure is used to access and modify this parameter:
4978 * struct sctp_assoc_value {
4979 * sctp_assoc_t assoc_id;
4980 * uint32_t assoc_value;
4983 * assoc_id: This parameter is ignored for one-to-one style sockets.
4984 * For one-to-many style sockets this parameter indicates which
4985 * association the user is performing an action upon. Note that if
4986 * this field's value is zero then the endpoints default value is
4987 * changed (effecting future associations only).
4988 * assoc_value: This parameter specifies the maximum size in bytes.
4990 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
4991 char __user
*optval
, int __user
*optlen
)
4993 struct sctp_assoc_value params
;
4994 struct sctp_association
*asoc
;
4996 if (len
== sizeof(int)) {
4997 pr_warn("Use of int in maxseg socket option deprecated\n");
4998 pr_warn("Use struct sctp_assoc_value instead\n");
4999 params
.assoc_id
= 0;
5000 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5001 len
= sizeof(struct sctp_assoc_value
);
5002 if (copy_from_user(¶ms
, optval
, sizeof(params
)))
5007 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5008 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
5012 params
.assoc_value
= asoc
->frag_point
;
5014 params
.assoc_value
= sctp_sk(sk
)->user_frag
;
5016 if (put_user(len
, optlen
))
5018 if (len
== sizeof(int)) {
5019 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5022 if (copy_to_user(optval
, ¶ms
, len
))
5030 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5031 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5033 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
5034 char __user
*optval
, int __user
*optlen
)
5038 if (len
< sizeof(int))
5043 val
= sctp_sk(sk
)->frag_interleave
;
5044 if (put_user(len
, optlen
))
5046 if (copy_to_user(optval
, &val
, len
))
5053 * 7.1.25. Set or Get the sctp partial delivery point
5054 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5056 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
5057 char __user
*optval
,
5062 if (len
< sizeof(u32
))
5067 val
= sctp_sk(sk
)->pd_point
;
5068 if (put_user(len
, optlen
))
5070 if (copy_to_user(optval
, &val
, len
))
5077 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5078 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5080 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5081 char __user
*optval
,
5084 struct sctp_assoc_value params
;
5085 struct sctp_sock
*sp
;
5086 struct sctp_association
*asoc
;
5088 if (len
== sizeof(int)) {
5089 pr_warn("Use of int in max_burst socket option deprecated\n");
5090 pr_warn("Use struct sctp_assoc_value instead\n");
5091 params
.assoc_id
= 0;
5092 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5093 len
= sizeof(struct sctp_assoc_value
);
5094 if (copy_from_user(¶ms
, optval
, len
))
5101 if (params
.assoc_id
!= 0) {
5102 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5105 params
.assoc_value
= asoc
->max_burst
;
5107 params
.assoc_value
= sp
->max_burst
;
5109 if (len
== sizeof(int)) {
5110 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5113 if (copy_to_user(optval
, ¶ms
, len
))
5121 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5122 char __user
*optval
, int __user
*optlen
)
5124 struct sctp_hmacalgo __user
*p
= (void __user
*)optval
;
5125 struct sctp_hmac_algo_param
*hmacs
;
5129 if (!sctp_auth_enable
)
5132 hmacs
= sctp_sk(sk
)->ep
->auth_hmacs_list
;
5133 data_len
= ntohs(hmacs
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5135 if (len
< sizeof(struct sctp_hmacalgo
) + data_len
)
5138 len
= sizeof(struct sctp_hmacalgo
) + data_len
;
5139 num_idents
= data_len
/ sizeof(u16
);
5141 if (put_user(len
, optlen
))
5143 if (put_user(num_idents
, &p
->shmac_num_idents
))
5145 if (copy_to_user(p
->shmac_idents
, hmacs
->hmac_ids
, data_len
))
5150 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5151 char __user
*optval
, int __user
*optlen
)
5153 struct sctp_authkeyid val
;
5154 struct sctp_association
*asoc
;
5156 if (!sctp_auth_enable
)
5159 if (len
< sizeof(struct sctp_authkeyid
))
5161 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5164 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5165 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5169 val
.scact_keynumber
= asoc
->active_key_id
;
5171 val
.scact_keynumber
= sctp_sk(sk
)->ep
->active_key_id
;
5173 len
= sizeof(struct sctp_authkeyid
);
5174 if (put_user(len
, optlen
))
5176 if (copy_to_user(optval
, &val
, len
))
5182 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5183 char __user
*optval
, int __user
*optlen
)
5185 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5186 struct sctp_authchunks val
;
5187 struct sctp_association
*asoc
;
5188 struct sctp_chunks_param
*ch
;
5192 if (!sctp_auth_enable
)
5195 if (len
< sizeof(struct sctp_authchunks
))
5198 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
5201 to
= p
->gauth_chunks
;
5202 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5206 ch
= asoc
->peer
.peer_chunks
;
5210 /* See if the user provided enough room for all the data */
5211 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5212 if (len
< num_chunks
)
5215 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
5218 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
5219 if (put_user(len
, optlen
)) return -EFAULT
;
5220 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5225 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
5226 char __user
*optval
, int __user
*optlen
)
5228 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5229 struct sctp_authchunks val
;
5230 struct sctp_association
*asoc
;
5231 struct sctp_chunks_param
*ch
;
5235 if (!sctp_auth_enable
)
5238 if (len
< sizeof(struct sctp_authchunks
))
5241 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
5244 to
= p
->gauth_chunks
;
5245 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5246 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
5250 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
5252 ch
= sctp_sk(sk
)->ep
->auth_chunk_list
;
5257 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5258 if (len
< sizeof(struct sctp_authchunks
) + num_chunks
)
5261 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
5264 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
5265 if (put_user(len
, optlen
))
5267 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5274 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5275 * This option gets the current number of associations that are attached
5276 * to a one-to-many style socket. The option value is an uint32_t.
5278 static int sctp_getsockopt_assoc_number(struct sock
*sk
, int len
,
5279 char __user
*optval
, int __user
*optlen
)
5281 struct sctp_sock
*sp
= sctp_sk(sk
);
5282 struct sctp_association
*asoc
;
5285 if (sctp_style(sk
, TCP
))
5288 if (len
< sizeof(u32
))
5293 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5297 if (put_user(len
, optlen
))
5299 if (copy_to_user(optval
, &val
, len
))
5306 * 8.2.6. Get the Current Identifiers of Associations
5307 * (SCTP_GET_ASSOC_ID_LIST)
5309 * This option gets the current list of SCTP association identifiers of
5310 * the SCTP associations handled by a one-to-many style socket.
5312 static int sctp_getsockopt_assoc_ids(struct sock
*sk
, int len
,
5313 char __user
*optval
, int __user
*optlen
)
5315 struct sctp_sock
*sp
= sctp_sk(sk
);
5316 struct sctp_association
*asoc
;
5317 struct sctp_assoc_ids
*ids
;
5320 if (sctp_style(sk
, TCP
))
5323 if (len
< sizeof(struct sctp_assoc_ids
))
5326 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5330 if (len
< sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
)
5333 len
= sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
;
5335 ids
= kmalloc(len
, GFP_KERNEL
);
5339 ids
->gaids_number_of_ids
= num
;
5341 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5342 ids
->gaids_assoc_id
[num
++] = asoc
->assoc_id
;
5345 if (put_user(len
, optlen
) || copy_to_user(optval
, ids
, len
)) {
5354 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
5355 char __user
*optval
, int __user
*optlen
)
5360 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5363 /* I can hardly begin to describe how wrong this is. This is
5364 * so broken as to be worse than useless. The API draft
5365 * REALLY is NOT helpful here... I am not convinced that the
5366 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5367 * are at all well-founded.
5369 if (level
!= SOL_SCTP
) {
5370 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5372 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
5376 if (get_user(len
, optlen
))
5383 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
5385 case SCTP_DISABLE_FRAGMENTS
:
5386 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
5390 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
5392 case SCTP_AUTOCLOSE
:
5393 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
5395 case SCTP_SOCKOPT_PEELOFF
:
5396 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
5398 case SCTP_PEER_ADDR_PARAMS
:
5399 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
5402 case SCTP_DELAYED_SACK
:
5403 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
5407 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
5409 case SCTP_GET_PEER_ADDRS
:
5410 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
5413 case SCTP_GET_LOCAL_ADDRS
:
5414 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
5417 case SCTP_SOCKOPT_CONNECTX3
:
5418 retval
= sctp_getsockopt_connectx3(sk
, len
, optval
, optlen
);
5420 case SCTP_DEFAULT_SEND_PARAM
:
5421 retval
= sctp_getsockopt_default_send_param(sk
, len
,
5424 case SCTP_PRIMARY_ADDR
:
5425 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
5428 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
5431 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
5433 case SCTP_ASSOCINFO
:
5434 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
5436 case SCTP_I_WANT_MAPPED_V4_ADDR
:
5437 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
5440 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
5442 case SCTP_GET_PEER_ADDR_INFO
:
5443 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
5446 case SCTP_ADAPTATION_LAYER
:
5447 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
5451 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
5453 case SCTP_FRAGMENT_INTERLEAVE
:
5454 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
5457 case SCTP_PARTIAL_DELIVERY_POINT
:
5458 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
5461 case SCTP_MAX_BURST
:
5462 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
5465 case SCTP_AUTH_CHUNK
:
5466 case SCTP_AUTH_DELETE_KEY
:
5467 retval
= -EOPNOTSUPP
;
5469 case SCTP_HMAC_IDENT
:
5470 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
5472 case SCTP_AUTH_ACTIVE_KEY
:
5473 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
5475 case SCTP_PEER_AUTH_CHUNKS
:
5476 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
5479 case SCTP_LOCAL_AUTH_CHUNKS
:
5480 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
5483 case SCTP_GET_ASSOC_NUMBER
:
5484 retval
= sctp_getsockopt_assoc_number(sk
, len
, optval
, optlen
);
5486 case SCTP_GET_ASSOC_ID_LIST
:
5487 retval
= sctp_getsockopt_assoc_ids(sk
, len
, optval
, optlen
);
5490 retval
= -ENOPROTOOPT
;
5494 sctp_release_sock(sk
);
5498 static void sctp_hash(struct sock
*sk
)
5503 static void sctp_unhash(struct sock
*sk
)
5508 /* Check if port is acceptable. Possibly find first available port.
5510 * The port hash table (contained in the 'global' SCTP protocol storage
5511 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5512 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5513 * list (the list number is the port number hashed out, so as you
5514 * would expect from a hash function, all the ports in a given list have
5515 * such a number that hashes out to the same list number; you were
5516 * expecting that, right?); so each list has a set of ports, with a
5517 * link to the socket (struct sock) that uses it, the port number and
5518 * a fastreuse flag (FIXME: NPI ipg).
5520 static struct sctp_bind_bucket
*sctp_bucket_create(
5521 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
5523 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
5525 struct sctp_bind_hashbucket
*head
; /* hash list */
5526 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5527 struct hlist_node
*node
;
5528 unsigned short snum
;
5531 snum
= ntohs(addr
->v4
.sin_port
);
5533 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
5534 sctp_local_bh_disable();
5537 /* Search for an available port. */
5538 int low
, high
, remaining
, index
;
5541 inet_get_local_port_range(&low
, &high
);
5542 remaining
= (high
- low
) + 1;
5543 rover
= net_random() % remaining
+ low
;
5547 if ((rover
< low
) || (rover
> high
))
5549 if (inet_is_reserved_local_port(rover
))
5551 index
= sctp_phashfn(rover
);
5552 head
= &sctp_port_hashtable
[index
];
5553 sctp_spin_lock(&head
->lock
);
5554 sctp_for_each_hentry(pp
, node
, &head
->chain
)
5555 if (pp
->port
== rover
)
5559 sctp_spin_unlock(&head
->lock
);
5560 } while (--remaining
> 0);
5562 /* Exhausted local port range during search? */
5567 /* OK, here is the one we will use. HEAD (the port
5568 * hash table list entry) is non-NULL and we hold it's
5573 /* We are given an specific port number; we verify
5574 * that it is not being used. If it is used, we will
5575 * exahust the search in the hash list corresponding
5576 * to the port number (snum) - we detect that with the
5577 * port iterator, pp being NULL.
5579 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
5580 sctp_spin_lock(&head
->lock
);
5581 sctp_for_each_hentry(pp
, node
, &head
->chain
) {
5582 if (pp
->port
== snum
)
5589 if (!hlist_empty(&pp
->owner
)) {
5590 /* We had a port hash table hit - there is an
5591 * available port (pp != NULL) and it is being
5592 * used by other socket (pp->owner not empty); that other
5593 * socket is going to be sk2.
5595 int reuse
= sk
->sk_reuse
;
5598 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5599 if (pp
->fastreuse
&& sk
->sk_reuse
&&
5600 sk
->sk_state
!= SCTP_SS_LISTENING
)
5603 /* Run through the list of sockets bound to the port
5604 * (pp->port) [via the pointers bind_next and
5605 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5606 * we get the endpoint they describe and run through
5607 * the endpoint's list of IP (v4 or v6) addresses,
5608 * comparing each of the addresses with the address of
5609 * the socket sk. If we find a match, then that means
5610 * that this port/socket (sk) combination are already
5613 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
5614 struct sctp_endpoint
*ep2
;
5615 ep2
= sctp_sk(sk2
)->ep
;
5618 (reuse
&& sk2
->sk_reuse
&&
5619 sk2
->sk_state
!= SCTP_SS_LISTENING
))
5622 if (sctp_bind_addr_conflict(&ep2
->base
.bind_addr
, addr
,
5623 sctp_sk(sk2
), sctp_sk(sk
))) {
5628 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5631 /* If there was a hash table miss, create a new port. */
5633 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
5636 /* In either case (hit or miss), make sure fastreuse is 1 only
5637 * if sk->sk_reuse is too (that is, if the caller requested
5638 * SO_REUSEADDR on this socket -sk-).
5640 if (hlist_empty(&pp
->owner
)) {
5641 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
5645 } else if (pp
->fastreuse
&&
5646 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
5649 /* We are set, so fill up all the data in the hash table
5650 * entry, tie the socket list information with the rest of the
5651 * sockets FIXME: Blurry, NPI (ipg).
5654 if (!sctp_sk(sk
)->bind_hash
) {
5655 inet_sk(sk
)->inet_num
= snum
;
5656 sk_add_bind_node(sk
, &pp
->owner
);
5657 sctp_sk(sk
)->bind_hash
= pp
;
5662 sctp_spin_unlock(&head
->lock
);
5665 sctp_local_bh_enable();
5669 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5670 * port is requested.
5672 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
5675 union sctp_addr addr
;
5676 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5678 /* Set up a dummy address struct from the sk. */
5679 af
->from_sk(&addr
, sk
);
5680 addr
.v4
.sin_port
= htons(snum
);
5682 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5683 ret
= sctp_get_port_local(sk
, &addr
);
5689 * Move a socket to LISTENING state.
5691 SCTP_STATIC
int sctp_listen_start(struct sock
*sk
, int backlog
)
5693 struct sctp_sock
*sp
= sctp_sk(sk
);
5694 struct sctp_endpoint
*ep
= sp
->ep
;
5695 struct crypto_hash
*tfm
= NULL
;
5697 /* Allocate HMAC for generating cookie. */
5698 if (!sctp_sk(sk
)->hmac
&& sctp_hmac_alg
) {
5699 tfm
= crypto_alloc_hash(sctp_hmac_alg
, 0, CRYPTO_ALG_ASYNC
);
5701 if (net_ratelimit()) {
5702 pr_info("failed to load transform for %s: %ld\n",
5703 sctp_hmac_alg
, PTR_ERR(tfm
));
5707 sctp_sk(sk
)->hmac
= tfm
;
5711 * If a bind() or sctp_bindx() is not called prior to a listen()
5712 * call that allows new associations to be accepted, the system
5713 * picks an ephemeral port and will choose an address set equivalent
5714 * to binding with a wildcard address.
5716 * This is not currently spelled out in the SCTP sockets
5717 * extensions draft, but follows the practice as seen in TCP
5721 sk
->sk_state
= SCTP_SS_LISTENING
;
5722 if (!ep
->base
.bind_addr
.port
) {
5723 if (sctp_autobind(sk
))
5726 if (sctp_get_port(sk
, inet_sk(sk
)->inet_num
)) {
5727 sk
->sk_state
= SCTP_SS_CLOSED
;
5732 sk
->sk_max_ack_backlog
= backlog
;
5733 sctp_hash_endpoint(ep
);
5738 * 4.1.3 / 5.1.3 listen()
5740 * By default, new associations are not accepted for UDP style sockets.
5741 * An application uses listen() to mark a socket as being able to
5742 * accept new associations.
5744 * On TCP style sockets, applications use listen() to ready the SCTP
5745 * endpoint for accepting inbound associations.
5747 * On both types of endpoints a backlog of '0' disables listening.
5749 * Move a socket to LISTENING state.
5751 int sctp_inet_listen(struct socket
*sock
, int backlog
)
5753 struct sock
*sk
= sock
->sk
;
5754 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
5757 if (unlikely(backlog
< 0))
5762 /* Peeled-off sockets are not allowed to listen(). */
5763 if (sctp_style(sk
, UDP_HIGH_BANDWIDTH
))
5766 if (sock
->state
!= SS_UNCONNECTED
)
5769 /* If backlog is zero, disable listening. */
5771 if (sctp_sstate(sk
, CLOSED
))
5775 sctp_unhash_endpoint(ep
);
5776 sk
->sk_state
= SCTP_SS_CLOSED
;
5778 sctp_sk(sk
)->bind_hash
->fastreuse
= 1;
5782 /* If we are already listening, just update the backlog */
5783 if (sctp_sstate(sk
, LISTENING
))
5784 sk
->sk_max_ack_backlog
= backlog
;
5786 err
= sctp_listen_start(sk
, backlog
);
5793 sctp_release_sock(sk
);
5798 * This function is done by modeling the current datagram_poll() and the
5799 * tcp_poll(). Note that, based on these implementations, we don't
5800 * lock the socket in this function, even though it seems that,
5801 * ideally, locking or some other mechanisms can be used to ensure
5802 * the integrity of the counters (sndbuf and wmem_alloc) used
5803 * in this place. We assume that we don't need locks either until proven
5806 * Another thing to note is that we include the Async I/O support
5807 * here, again, by modeling the current TCP/UDP code. We don't have
5808 * a good way to test with it yet.
5810 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
5812 struct sock
*sk
= sock
->sk
;
5813 struct sctp_sock
*sp
= sctp_sk(sk
);
5816 poll_wait(file
, sk_sleep(sk
), wait
);
5818 /* A TCP-style listening socket becomes readable when the accept queue
5821 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
5822 return (!list_empty(&sp
->ep
->asocs
)) ?
5823 (POLLIN
| POLLRDNORM
) : 0;
5827 /* Is there any exceptional events? */
5828 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
5830 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5831 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
5832 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
5835 /* Is it readable? Reconsider this code with TCP-style support. */
5836 if (!skb_queue_empty(&sk
->sk_receive_queue
))
5837 mask
|= POLLIN
| POLLRDNORM
;
5839 /* The association is either gone or not ready. */
5840 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
5843 /* Is it writable? */
5844 if (sctp_writeable(sk
)) {
5845 mask
|= POLLOUT
| POLLWRNORM
;
5847 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
5849 * Since the socket is not locked, the buffer
5850 * might be made available after the writeable check and
5851 * before the bit is set. This could cause a lost I/O
5852 * signal. tcp_poll() has a race breaker for this race
5853 * condition. Based on their implementation, we put
5854 * in the following code to cover it as well.
5856 if (sctp_writeable(sk
))
5857 mask
|= POLLOUT
| POLLWRNORM
;
5862 /********************************************************************
5863 * 2nd Level Abstractions
5864 ********************************************************************/
5866 static struct sctp_bind_bucket
*sctp_bucket_create(
5867 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
5869 struct sctp_bind_bucket
*pp
;
5871 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
5873 SCTP_DBG_OBJCNT_INC(bind_bucket
);
5876 INIT_HLIST_HEAD(&pp
->owner
);
5877 hlist_add_head(&pp
->node
, &head
->chain
);
5882 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5883 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
5885 if (pp
&& hlist_empty(&pp
->owner
)) {
5886 __hlist_del(&pp
->node
);
5887 kmem_cache_free(sctp_bucket_cachep
, pp
);
5888 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
5892 /* Release this socket's reference to a local port. */
5893 static inline void __sctp_put_port(struct sock
*sk
)
5895 struct sctp_bind_hashbucket
*head
=
5896 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->inet_num
)];
5897 struct sctp_bind_bucket
*pp
;
5899 sctp_spin_lock(&head
->lock
);
5900 pp
= sctp_sk(sk
)->bind_hash
;
5901 __sk_del_bind_node(sk
);
5902 sctp_sk(sk
)->bind_hash
= NULL
;
5903 inet_sk(sk
)->inet_num
= 0;
5904 sctp_bucket_destroy(pp
);
5905 sctp_spin_unlock(&head
->lock
);
5908 void sctp_put_port(struct sock
*sk
)
5910 sctp_local_bh_disable();
5911 __sctp_put_port(sk
);
5912 sctp_local_bh_enable();
5916 * The system picks an ephemeral port and choose an address set equivalent
5917 * to binding with a wildcard address.
5918 * One of those addresses will be the primary address for the association.
5919 * This automatically enables the multihoming capability of SCTP.
5921 static int sctp_autobind(struct sock
*sk
)
5923 union sctp_addr autoaddr
;
5927 /* Initialize a local sockaddr structure to INADDR_ANY. */
5928 af
= sctp_sk(sk
)->pf
->af
;
5930 port
= htons(inet_sk(sk
)->inet_num
);
5931 af
->inaddr_any(&autoaddr
, port
);
5933 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5936 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5939 * 4.2 The cmsghdr Structure *
5941 * When ancillary data is sent or received, any number of ancillary data
5942 * objects can be specified by the msg_control and msg_controllen members of
5943 * the msghdr structure, because each object is preceded by
5944 * a cmsghdr structure defining the object's length (the cmsg_len member).
5945 * Historically Berkeley-derived implementations have passed only one object
5946 * at a time, but this API allows multiple objects to be
5947 * passed in a single call to sendmsg() or recvmsg(). The following example
5948 * shows two ancillary data objects in a control buffer.
5950 * |<--------------------------- msg_controllen -------------------------->|
5953 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5955 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5958 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5960 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5963 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5964 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5966 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5968 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5975 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
5976 sctp_cmsgs_t
*cmsgs
)
5978 struct cmsghdr
*cmsg
;
5979 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
5981 for (cmsg
= CMSG_FIRSTHDR(msg
);
5983 cmsg
= CMSG_NXTHDR(my_msg
, cmsg
)) {
5984 if (!CMSG_OK(my_msg
, cmsg
))
5987 /* Should we parse this header or ignore? */
5988 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
5991 /* Strictly check lengths following example in SCM code. */
5992 switch (cmsg
->cmsg_type
) {
5994 /* SCTP Socket API Extension
5995 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5997 * This cmsghdr structure provides information for
5998 * initializing new SCTP associations with sendmsg().
5999 * The SCTP_INITMSG socket option uses this same data
6000 * structure. This structure is not used for
6003 * cmsg_level cmsg_type cmsg_data[]
6004 * ------------ ------------ ----------------------
6005 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6007 if (cmsg
->cmsg_len
!=
6008 CMSG_LEN(sizeof(struct sctp_initmsg
)))
6010 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
6014 /* SCTP Socket API Extension
6015 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6017 * This cmsghdr structure specifies SCTP options for
6018 * sendmsg() and describes SCTP header information
6019 * about a received message through recvmsg().
6021 * cmsg_level cmsg_type cmsg_data[]
6022 * ------------ ------------ ----------------------
6023 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6025 if (cmsg
->cmsg_len
!=
6026 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
6030 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
6032 /* Minimally, validate the sinfo_flags. */
6033 if (cmsgs
->info
->sinfo_flags
&
6034 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
6035 SCTP_ABORT
| SCTP_EOF
))
6047 * Wait for a packet..
6048 * Note: This function is the same function as in core/datagram.c
6049 * with a few modifications to make lksctp work.
6051 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
6056 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
6058 /* Socket errors? */
6059 error
= sock_error(sk
);
6063 if (!skb_queue_empty(&sk
->sk_receive_queue
))
6066 /* Socket shut down? */
6067 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6070 /* Sequenced packets can come disconnected. If so we report the
6075 /* Is there a good reason to think that we may receive some data? */
6076 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
6079 /* Handle signals. */
6080 if (signal_pending(current
))
6083 /* Let another process have a go. Since we are going to sleep
6084 * anyway. Note: This may cause odd behaviors if the message
6085 * does not fit in the user's buffer, but this seems to be the
6086 * only way to honor MSG_DONTWAIT realistically.
6088 sctp_release_sock(sk
);
6089 *timeo_p
= schedule_timeout(*timeo_p
);
6093 finish_wait(sk_sleep(sk
), &wait
);
6097 error
= sock_intr_errno(*timeo_p
);
6100 finish_wait(sk_sleep(sk
), &wait
);
6105 /* Receive a datagram.
6106 * Note: This is pretty much the same routine as in core/datagram.c
6107 * with a few changes to make lksctp work.
6109 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
6110 int noblock
, int *err
)
6113 struct sk_buff
*skb
;
6116 timeo
= sock_rcvtimeo(sk
, noblock
);
6118 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6119 timeo
, MAX_SCHEDULE_TIMEOUT
);
6122 /* Again only user level code calls this function,
6123 * so nothing interrupt level
6124 * will suddenly eat the receive_queue.
6126 * Look at current nfs client by the way...
6127 * However, this function was correct in any case. 8)
6129 if (flags
& MSG_PEEK
) {
6130 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
6131 skb
= skb_peek(&sk
->sk_receive_queue
);
6133 atomic_inc(&skb
->users
);
6134 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
6136 skb
= skb_dequeue(&sk
->sk_receive_queue
);
6142 /* Caller is allowed not to check sk->sk_err before calling. */
6143 error
= sock_error(sk
);
6147 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6150 /* User doesn't want to wait. */
6154 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
6163 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6164 static void __sctp_write_space(struct sctp_association
*asoc
)
6166 struct sock
*sk
= asoc
->base
.sk
;
6167 struct socket
*sock
= sk
->sk_socket
;
6169 if ((sctp_wspace(asoc
) > 0) && sock
) {
6170 if (waitqueue_active(&asoc
->wait
))
6171 wake_up_interruptible(&asoc
->wait
);
6173 if (sctp_writeable(sk
)) {
6174 wait_queue_head_t
*wq
= sk_sleep(sk
);
6176 if (wq
&& waitqueue_active(wq
))
6177 wake_up_interruptible(wq
);
6179 /* Note that we try to include the Async I/O support
6180 * here by modeling from the current TCP/UDP code.
6181 * We have not tested with it yet.
6183 if (!(sk
->sk_shutdown
& SEND_SHUTDOWN
))
6184 sock_wake_async(sock
,
6185 SOCK_WAKE_SPACE
, POLL_OUT
);
6190 /* Do accounting for the sndbuf space.
6191 * Decrement the used sndbuf space of the corresponding association by the
6192 * data size which was just transmitted(freed).
6194 static void sctp_wfree(struct sk_buff
*skb
)
6196 struct sctp_association
*asoc
;
6197 struct sctp_chunk
*chunk
;
6200 /* Get the saved chunk pointer. */
6201 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
6204 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
6205 sizeof(struct sk_buff
) +
6206 sizeof(struct sctp_chunk
);
6208 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
6211 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6213 sk
->sk_wmem_queued
-= skb
->truesize
;
6214 sk_mem_uncharge(sk
, skb
->truesize
);
6217 __sctp_write_space(asoc
);
6219 sctp_association_put(asoc
);
6222 /* Do accounting for the receive space on the socket.
6223 * Accounting for the association is done in ulpevent.c
6224 * We set this as a destructor for the cloned data skbs so that
6225 * accounting is done at the correct time.
6227 void sctp_sock_rfree(struct sk_buff
*skb
)
6229 struct sock
*sk
= skb
->sk
;
6230 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
6232 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
6235 * Mimic the behavior of sock_rfree
6237 sk_mem_uncharge(sk
, event
->rmem_len
);
6241 /* Helper function to wait for space in the sndbuf. */
6242 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
6245 struct sock
*sk
= asoc
->base
.sk
;
6247 long current_timeo
= *timeo_p
;
6250 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6251 asoc
, (long)(*timeo_p
), msg_len
);
6253 /* Increment the association's refcnt. */
6254 sctp_association_hold(asoc
);
6256 /* Wait on the association specific sndbuf space. */
6258 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6259 TASK_INTERRUPTIBLE
);
6262 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6265 if (signal_pending(current
))
6266 goto do_interrupted
;
6267 if (msg_len
<= sctp_wspace(asoc
))
6270 /* Let another process have a go. Since we are going
6273 sctp_release_sock(sk
);
6274 current_timeo
= schedule_timeout(current_timeo
);
6275 BUG_ON(sk
!= asoc
->base
.sk
);
6278 *timeo_p
= current_timeo
;
6282 finish_wait(&asoc
->wait
, &wait
);
6284 /* Release the association's refcnt. */
6285 sctp_association_put(asoc
);
6294 err
= sock_intr_errno(*timeo_p
);
6302 void sctp_data_ready(struct sock
*sk
, int len
)
6304 struct socket_wq
*wq
;
6307 wq
= rcu_dereference(sk
->sk_wq
);
6308 if (wq_has_sleeper(wq
))
6309 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
6310 POLLRDNORM
| POLLRDBAND
);
6311 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
6315 /* If socket sndbuf has changed, wake up all per association waiters. */
6316 void sctp_write_space(struct sock
*sk
)
6318 struct sctp_association
*asoc
;
6320 /* Wake up the tasks in each wait queue. */
6321 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
6322 __sctp_write_space(asoc
);
6326 /* Is there any sndbuf space available on the socket?
6328 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6329 * associations on the same socket. For a UDP-style socket with
6330 * multiple associations, it is possible for it to be "unwriteable"
6331 * prematurely. I assume that this is acceptable because
6332 * a premature "unwriteable" is better than an accidental "writeable" which
6333 * would cause an unwanted block under certain circumstances. For the 1-1
6334 * UDP-style sockets or TCP-style sockets, this code should work.
6337 static int sctp_writeable(struct sock
*sk
)
6341 amt
= sk
->sk_sndbuf
- sk_wmem_alloc_get(sk
);
6347 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6348 * returns immediately with EINPROGRESS.
6350 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
6352 struct sock
*sk
= asoc
->base
.sk
;
6354 long current_timeo
= *timeo_p
;
6357 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__
, asoc
,
6360 /* Increment the association's refcnt. */
6361 sctp_association_hold(asoc
);
6364 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6365 TASK_INTERRUPTIBLE
);
6368 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6370 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6373 if (signal_pending(current
))
6374 goto do_interrupted
;
6376 if (sctp_state(asoc
, ESTABLISHED
))
6379 /* Let another process have a go. Since we are going
6382 sctp_release_sock(sk
);
6383 current_timeo
= schedule_timeout(current_timeo
);
6386 *timeo_p
= current_timeo
;
6390 finish_wait(&asoc
->wait
, &wait
);
6392 /* Release the association's refcnt. */
6393 sctp_association_put(asoc
);
6398 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
6401 err
= -ECONNREFUSED
;
6405 err
= sock_intr_errno(*timeo_p
);
6413 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
6415 struct sctp_endpoint
*ep
;
6419 ep
= sctp_sk(sk
)->ep
;
6423 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
6424 TASK_INTERRUPTIBLE
);
6426 if (list_empty(&ep
->asocs
)) {
6427 sctp_release_sock(sk
);
6428 timeo
= schedule_timeout(timeo
);
6433 if (!sctp_sstate(sk
, LISTENING
))
6437 if (!list_empty(&ep
->asocs
))
6440 err
= sock_intr_errno(timeo
);
6441 if (signal_pending(current
))
6449 finish_wait(sk_sleep(sk
), &wait
);
6454 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
6459 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
6460 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
6462 sctp_release_sock(sk
);
6463 timeout
= schedule_timeout(timeout
);
6465 } while (!signal_pending(current
) && timeout
);
6467 finish_wait(sk_sleep(sk
), &wait
);
6470 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
6472 struct sk_buff
*frag
;
6477 /* Don't forget the fragments. */
6478 skb_walk_frags(skb
, frag
)
6479 sctp_skb_set_owner_r_frag(frag
, sk
);
6482 sctp_skb_set_owner_r(skb
, sk
);
6485 void sctp_copy_sock(struct sock
*newsk
, struct sock
*sk
,
6486 struct sctp_association
*asoc
)
6488 struct inet_sock
*inet
= inet_sk(sk
);
6489 struct inet_sock
*newinet
;
6491 newsk
->sk_type
= sk
->sk_type
;
6492 newsk
->sk_bound_dev_if
= sk
->sk_bound_dev_if
;
6493 newsk
->sk_flags
= sk
->sk_flags
;
6494 newsk
->sk_no_check
= sk
->sk_no_check
;
6495 newsk
->sk_reuse
= sk
->sk_reuse
;
6497 newsk
->sk_shutdown
= sk
->sk_shutdown
;
6498 newsk
->sk_destruct
= inet_sock_destruct
;
6499 newsk
->sk_family
= sk
->sk_family
;
6500 newsk
->sk_protocol
= IPPROTO_SCTP
;
6501 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
6502 newsk
->sk_sndbuf
= sk
->sk_sndbuf
;
6503 newsk
->sk_rcvbuf
= sk
->sk_rcvbuf
;
6504 newsk
->sk_lingertime
= sk
->sk_lingertime
;
6505 newsk
->sk_rcvtimeo
= sk
->sk_rcvtimeo
;
6506 newsk
->sk_sndtimeo
= sk
->sk_sndtimeo
;
6508 newinet
= inet_sk(newsk
);
6510 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6511 * getsockname() and getpeername()
6513 newinet
->inet_sport
= inet
->inet_sport
;
6514 newinet
->inet_saddr
= inet
->inet_saddr
;
6515 newinet
->inet_rcv_saddr
= inet
->inet_rcv_saddr
;
6516 newinet
->inet_dport
= htons(asoc
->peer
.port
);
6517 newinet
->pmtudisc
= inet
->pmtudisc
;
6518 newinet
->inet_id
= asoc
->next_tsn
^ jiffies
;
6520 newinet
->uc_ttl
= inet
->uc_ttl
;
6521 newinet
->mc_loop
= 1;
6522 newinet
->mc_ttl
= 1;
6523 newinet
->mc_index
= 0;
6524 newinet
->mc_list
= NULL
;
6527 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6528 * and its messages to the newsk.
6530 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
6531 struct sctp_association
*assoc
,
6532 sctp_socket_type_t type
)
6534 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
6535 struct sctp_sock
*newsp
= sctp_sk(newsk
);
6536 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
6537 struct sctp_endpoint
*newep
= newsp
->ep
;
6538 struct sk_buff
*skb
, *tmp
;
6539 struct sctp_ulpevent
*event
;
6540 struct sctp_bind_hashbucket
*head
;
6542 /* Migrate socket buffer sizes and all the socket level options to the
6545 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
6546 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
6547 /* Brute force copy old sctp opt. */
6548 inet_sk_copy_descendant(newsk
, oldsk
);
6550 /* Restore the ep value that was overwritten with the above structure
6556 /* Hook this new socket in to the bind_hash list. */
6557 head
= &sctp_port_hashtable
[sctp_phashfn(inet_sk(oldsk
)->inet_num
)];
6558 sctp_local_bh_disable();
6559 sctp_spin_lock(&head
->lock
);
6560 pp
= sctp_sk(oldsk
)->bind_hash
;
6561 sk_add_bind_node(newsk
, &pp
->owner
);
6562 sctp_sk(newsk
)->bind_hash
= pp
;
6563 inet_sk(newsk
)->inet_num
= inet_sk(oldsk
)->inet_num
;
6564 sctp_spin_unlock(&head
->lock
);
6565 sctp_local_bh_enable();
6567 /* Copy the bind_addr list from the original endpoint to the new
6568 * endpoint so that we can handle restarts properly
6570 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
6571 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
6573 /* Move any messages in the old socket's receive queue that are for the
6574 * peeled off association to the new socket's receive queue.
6576 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
6577 event
= sctp_skb2event(skb
);
6578 if (event
->asoc
== assoc
) {
6579 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
6580 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
6581 sctp_skb_set_owner_r_frag(skb
, newsk
);
6585 /* Clean up any messages pending delivery due to partial
6586 * delivery. Three cases:
6587 * 1) No partial deliver; no work.
6588 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6589 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6591 skb_queue_head_init(&newsp
->pd_lobby
);
6592 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
6594 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
6595 struct sk_buff_head
*queue
;
6597 /* Decide which queue to move pd_lobby skbs to. */
6598 if (assoc
->ulpq
.pd_mode
) {
6599 queue
= &newsp
->pd_lobby
;
6601 queue
= &newsk
->sk_receive_queue
;
6603 /* Walk through the pd_lobby, looking for skbs that
6604 * need moved to the new socket.
6606 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6607 event
= sctp_skb2event(skb
);
6608 if (event
->asoc
== assoc
) {
6609 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6610 __skb_queue_tail(queue
, skb
);
6611 sctp_skb_set_owner_r_frag(skb
, newsk
);
6615 /* Clear up any skbs waiting for the partial
6616 * delivery to finish.
6618 if (assoc
->ulpq
.pd_mode
)
6619 sctp_clear_pd(oldsk
, NULL
);
6623 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
)
6624 sctp_skb_set_owner_r_frag(skb
, newsk
);
6626 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
)
6627 sctp_skb_set_owner_r_frag(skb
, newsk
);
6629 /* Set the type of socket to indicate that it is peeled off from the
6630 * original UDP-style socket or created with the accept() call on a
6631 * TCP-style socket..
6635 /* Mark the new socket "in-use" by the user so that any packets
6636 * that may arrive on the association after we've moved it are
6637 * queued to the backlog. This prevents a potential race between
6638 * backlog processing on the old socket and new-packet processing
6639 * on the new socket.
6641 * The caller has just allocated newsk so we can guarantee that other
6642 * paths won't try to lock it and then oldsk.
6644 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
6645 sctp_assoc_migrate(assoc
, newsk
);
6647 /* If the association on the newsk is already closed before accept()
6648 * is called, set RCV_SHUTDOWN flag.
6650 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
6651 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
6653 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
6654 sctp_release_sock(newsk
);
6658 /* This proto struct describes the ULP interface for SCTP. */
6659 struct proto sctp_prot
= {
6661 .owner
= THIS_MODULE
,
6662 .close
= sctp_close
,
6663 .connect
= sctp_connect
,
6664 .disconnect
= sctp_disconnect
,
6665 .accept
= sctp_accept
,
6666 .ioctl
= sctp_ioctl
,
6667 .init
= sctp_init_sock
,
6668 .destroy
= sctp_destroy_sock
,
6669 .shutdown
= sctp_shutdown
,
6670 .setsockopt
= sctp_setsockopt
,
6671 .getsockopt
= sctp_getsockopt
,
6672 .sendmsg
= sctp_sendmsg
,
6673 .recvmsg
= sctp_recvmsg
,
6675 .backlog_rcv
= sctp_backlog_rcv
,
6677 .unhash
= sctp_unhash
,
6678 .get_port
= sctp_get_port
,
6679 .obj_size
= sizeof(struct sctp_sock
),
6680 .sysctl_mem
= sysctl_sctp_mem
,
6681 .sysctl_rmem
= sysctl_sctp_rmem
,
6682 .sysctl_wmem
= sysctl_sctp_wmem
,
6683 .memory_pressure
= &sctp_memory_pressure
,
6684 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6685 .memory_allocated
= &sctp_memory_allocated
,
6686 .sockets_allocated
= &sctp_sockets_allocated
,
6689 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6691 struct proto sctpv6_prot
= {
6693 .owner
= THIS_MODULE
,
6694 .close
= sctp_close
,
6695 .connect
= sctp_connect
,
6696 .disconnect
= sctp_disconnect
,
6697 .accept
= sctp_accept
,
6698 .ioctl
= sctp_ioctl
,
6699 .init
= sctp_init_sock
,
6700 .destroy
= sctp_destroy_sock
,
6701 .shutdown
= sctp_shutdown
,
6702 .setsockopt
= sctp_setsockopt
,
6703 .getsockopt
= sctp_getsockopt
,
6704 .sendmsg
= sctp_sendmsg
,
6705 .recvmsg
= sctp_recvmsg
,
6707 .backlog_rcv
= sctp_backlog_rcv
,
6709 .unhash
= sctp_unhash
,
6710 .get_port
= sctp_get_port
,
6711 .obj_size
= sizeof(struct sctp6_sock
),
6712 .sysctl_mem
= sysctl_sctp_mem
,
6713 .sysctl_rmem
= sysctl_sctp_rmem
,
6714 .sysctl_wmem
= sysctl_sctp_wmem
,
6715 .memory_pressure
= &sctp_memory_pressure
,
6716 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6717 .memory_allocated
= &sctp_memory_allocated
,
6718 .sockets_allocated
= &sctp_sockets_allocated
,
6720 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */