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 int 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_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
!= htons(bp
->port
)) {
666 /* FIXME - There is probably a need to check if sk->sk_saddr and
667 * sk->sk_rcv_addr are currently set to one of the addresses to
668 * be removed. This is something which needs to be looked into
669 * when we are fixing the outstanding issues with multi-homing
670 * socket routing and failover schemes. Refer to comments in
671 * sctp_do_bind(). -daisy
673 retval
= sctp_del_bind_addr(bp
, sa_addr
);
675 addr_buf
+= af
->sockaddr_len
;
678 /* Failed. Add the ones that has been removed back */
680 sctp_bindx_add(sk
, addrs
, cnt
);
688 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
689 * the associations that are part of the endpoint indicating that a list of
690 * local addresses are removed from the endpoint.
692 * If any of the addresses is already in the bind address list of the
693 * association, we do not send the chunk for that association. But it will not
694 * affect other associations.
696 * Only sctp_setsockopt_bindx() is supposed to call this function.
698 static int sctp_send_asconf_del_ip(struct sock
*sk
,
699 struct sockaddr
*addrs
,
702 struct sctp_sock
*sp
;
703 struct sctp_endpoint
*ep
;
704 struct sctp_association
*asoc
;
705 struct sctp_transport
*transport
;
706 struct sctp_bind_addr
*bp
;
707 struct sctp_chunk
*chunk
;
708 union sctp_addr
*laddr
;
711 struct sctp_sockaddr_entry
*saddr
;
715 if (!sctp_addip_enable
)
721 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
722 __func__
, sk
, addrs
, addrcnt
);
724 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
726 if (!asoc
->peer
.asconf_capable
)
729 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
732 if (!sctp_state(asoc
, ESTABLISHED
))
735 /* Check if any address in the packed array of addresses is
736 * not present in the bind address list of the association.
737 * If so, do not send the asconf chunk to its peer, but
738 * continue with other associations.
741 for (i
= 0; i
< addrcnt
; i
++) {
742 laddr
= (union sctp_addr
*)addr_buf
;
743 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
749 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
752 addr_buf
+= af
->sockaddr_len
;
757 /* Find one address in the association's bind address list
758 * that is not in the packed array of addresses. This is to
759 * make sure that we do not delete all the addresses in the
762 bp
= &asoc
->base
.bind_addr
;
763 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
768 /* We do not need RCU protection throughout this loop
769 * because this is done under a socket lock from the
772 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
779 /* Reset use_as_src flag for the addresses in the bind address
780 * list that are to be deleted.
783 for (i
= 0; i
< addrcnt
; i
++) {
784 laddr
= (union sctp_addr
*)addr_buf
;
785 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
786 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
787 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
788 saddr
->state
= SCTP_ADDR_DEL
;
790 addr_buf
+= af
->sockaddr_len
;
793 /* Update the route and saddr entries for all the transports
794 * as some of the addresses in the bind address list are
795 * about to be deleted and cannot be used as source addresses.
797 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
799 dst_release(transport
->dst
);
800 sctp_transport_route(transport
, NULL
,
801 sctp_sk(asoc
->base
.sk
));
804 retval
= sctp_send_asconf(asoc
, chunk
);
810 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
813 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
816 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
817 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
820 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
821 * Section 3.1.2 for this usage.
823 * addrs is a pointer to an array of one or more socket addresses. Each
824 * address is contained in its appropriate structure (i.e. struct
825 * sockaddr_in or struct sockaddr_in6) the family of the address type
826 * must be used to distinguish the address length (note that this
827 * representation is termed a "packed array" of addresses). The caller
828 * specifies the number of addresses in the array with addrcnt.
830 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
831 * -1, and sets errno to the appropriate error code.
833 * For SCTP, the port given in each socket address must be the same, or
834 * sctp_bindx() will fail, setting errno to EINVAL.
836 * The flags parameter is formed from the bitwise OR of zero or more of
837 * the following currently defined flags:
839 * SCTP_BINDX_ADD_ADDR
841 * SCTP_BINDX_REM_ADDR
843 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
844 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
845 * addresses from the association. The two flags are mutually exclusive;
846 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
847 * not remove all addresses from an association; sctp_bindx() will
848 * reject such an attempt with EINVAL.
850 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
851 * additional addresses with an endpoint after calling bind(). Or use
852 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
853 * socket is associated with so that no new association accepted will be
854 * associated with those addresses. If the endpoint supports dynamic
855 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
856 * endpoint to send the appropriate message to the peer to change the
857 * peers address lists.
859 * Adding and removing addresses from a connected association is
860 * optional functionality. Implementations that do not support this
861 * functionality should return EOPNOTSUPP.
863 * Basically do nothing but copying the addresses from user to kernel
864 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
865 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
868 * We don't use copy_from_user() for optimization: we first do the
869 * sanity checks (buffer size -fast- and access check-healthy
870 * pointer); if all of those succeed, then we can alloc the memory
871 * (expensive operation) needed to copy the data to kernel. Then we do
872 * the copying without checking the user space area
873 * (__copy_from_user()).
875 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
878 * sk The sk of the socket
879 * addrs The pointer to the addresses in user land
880 * addrssize Size of the addrs buffer
881 * op Operation to perform (add or remove, see the flags of
884 * Returns 0 if ok, <0 errno code on error.
886 SCTP_STATIC
int sctp_setsockopt_bindx(struct sock
* sk
,
887 struct sockaddr __user
*addrs
,
888 int addrs_size
, int op
)
890 struct sockaddr
*kaddrs
;
894 struct sockaddr
*sa_addr
;
898 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
899 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
901 if (unlikely(addrs_size
<= 0))
904 /* Check the user passed a healthy pointer. */
905 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
908 /* Alloc space for the address array in kernel memory. */
909 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
910 if (unlikely(!kaddrs
))
913 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
918 /* Walk through the addrs buffer and count the number of addresses. */
920 while (walk_size
< addrs_size
) {
921 sa_addr
= (struct sockaddr
*)addr_buf
;
922 af
= sctp_get_af_specific(sa_addr
->sa_family
);
924 /* If the address family is not supported or if this address
925 * causes the address buffer to overflow return EINVAL.
927 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
932 addr_buf
+= af
->sockaddr_len
;
933 walk_size
+= af
->sockaddr_len
;
938 case SCTP_BINDX_ADD_ADDR
:
939 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
942 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
945 case SCTP_BINDX_REM_ADDR
:
946 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
949 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
963 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
965 * Common routine for handling connect() and sctp_connectx().
966 * Connect will come in with just a single address.
968 static int __sctp_connect(struct sock
* sk
,
969 struct sockaddr
*kaddrs
,
971 sctp_assoc_t
*assoc_id
)
973 struct sctp_sock
*sp
;
974 struct sctp_endpoint
*ep
;
975 struct sctp_association
*asoc
= NULL
;
976 struct sctp_association
*asoc2
;
977 struct sctp_transport
*transport
;
985 union sctp_addr
*sa_addr
= NULL
;
988 unsigned int f_flags
= 0;
993 /* connect() cannot be done on a socket that is already in ESTABLISHED
994 * state - UDP-style peeled off socket or a TCP-style socket that
995 * is already connected.
996 * It cannot be done even on a TCP-style listening socket.
998 if (sctp_sstate(sk
, ESTABLISHED
) ||
999 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
1004 /* Walk through the addrs buffer and count the number of addresses. */
1006 while (walk_size
< addrs_size
) {
1007 sa_addr
= (union sctp_addr
*)addr_buf
;
1008 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1009 port
= ntohs(sa_addr
->v4
.sin_port
);
1011 /* If the address family is not supported or if this address
1012 * causes the address buffer to overflow return EINVAL.
1014 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1019 /* Save current address so we can work with it */
1020 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1022 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1026 /* Make sure the destination port is correctly set
1029 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
)
1033 /* Check if there already is a matching association on the
1034 * endpoint (other than the one created here).
1036 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1037 if (asoc2
&& asoc2
!= asoc
) {
1038 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1045 /* If we could not find a matching association on the endpoint,
1046 * make sure that there is no peeled-off association matching
1047 * the peer address even on another socket.
1049 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1050 err
= -EADDRNOTAVAIL
;
1055 /* If a bind() or sctp_bindx() is not called prior to
1056 * an sctp_connectx() call, the system picks an
1057 * ephemeral port and will choose an address set
1058 * equivalent to binding with a wildcard address.
1060 if (!ep
->base
.bind_addr
.port
) {
1061 if (sctp_autobind(sk
)) {
1067 * If an unprivileged user inherits a 1-many
1068 * style socket with open associations on a
1069 * privileged port, it MAY be permitted to
1070 * accept new associations, but it SHOULD NOT
1071 * be permitted to open new associations.
1073 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1074 !capable(CAP_NET_BIND_SERVICE
)) {
1080 scope
= sctp_scope(&to
);
1081 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1087 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
,
1095 /* Prime the peer's transport structures. */
1096 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1104 addr_buf
+= af
->sockaddr_len
;
1105 walk_size
+= af
->sockaddr_len
;
1108 /* In case the user of sctp_connectx() wants an association
1109 * id back, assign one now.
1112 err
= sctp_assoc_set_id(asoc
, GFP_KERNEL
);
1117 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1122 /* Initialize sk's dport and daddr for getpeername() */
1123 inet_sk(sk
)->inet_dport
= htons(asoc
->peer
.port
);
1124 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1125 af
->to_sk_daddr(sa_addr
, sk
);
1128 /* in-kernel sockets don't generally have a file allocated to them
1129 * if all they do is call sock_create_kern().
1131 if (sk
->sk_socket
->file
)
1132 f_flags
= sk
->sk_socket
->file
->f_flags
;
1134 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1136 err
= sctp_wait_for_connect(asoc
, &timeo
);
1137 if ((err
== 0 || err
== -EINPROGRESS
) && assoc_id
)
1138 *assoc_id
= asoc
->assoc_id
;
1140 /* Don't free association on exit. */
1145 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1146 " kaddrs: %p err: %d\n",
1149 sctp_association_free(asoc
);
1153 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1156 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1157 * sctp_assoc_t *asoc);
1159 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1160 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1161 * or IPv6 addresses.
1163 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1164 * Section 3.1.2 for this usage.
1166 * addrs is a pointer to an array of one or more socket addresses. Each
1167 * address is contained in its appropriate structure (i.e. struct
1168 * sockaddr_in or struct sockaddr_in6) the family of the address type
1169 * must be used to distengish the address length (note that this
1170 * representation is termed a "packed array" of addresses). The caller
1171 * specifies the number of addresses in the array with addrcnt.
1173 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1174 * the association id of the new association. On failure, sctp_connectx()
1175 * returns -1, and sets errno to the appropriate error code. The assoc_id
1176 * is not touched by the kernel.
1178 * For SCTP, the port given in each socket address must be the same, or
1179 * sctp_connectx() will fail, setting errno to EINVAL.
1181 * An application can use sctp_connectx to initiate an association with
1182 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1183 * allows a caller to specify multiple addresses at which a peer can be
1184 * reached. The way the SCTP stack uses the list of addresses to set up
1185 * the association is implementation dependant. This function only
1186 * specifies that the stack will try to make use of all the addresses in
1187 * the list when needed.
1189 * Note that the list of addresses passed in is only used for setting up
1190 * the association. It does not necessarily equal the set of addresses
1191 * the peer uses for the resulting association. If the caller wants to
1192 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1193 * retrieve them after the association has been set up.
1195 * Basically do nothing but copying the addresses from user to kernel
1196 * land and invoking either sctp_connectx(). This is used for tunneling
1197 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1199 * We don't use copy_from_user() for optimization: we first do the
1200 * sanity checks (buffer size -fast- and access check-healthy
1201 * pointer); if all of those succeed, then we can alloc the memory
1202 * (expensive operation) needed to copy the data to kernel. Then we do
1203 * the copying without checking the user space area
1204 * (__copy_from_user()).
1206 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1209 * sk The sk of the socket
1210 * addrs The pointer to the addresses in user land
1211 * addrssize Size of the addrs buffer
1213 * Returns >=0 if ok, <0 errno code on error.
1215 SCTP_STATIC
int __sctp_setsockopt_connectx(struct sock
* sk
,
1216 struct sockaddr __user
*addrs
,
1218 sctp_assoc_t
*assoc_id
)
1221 struct sockaddr
*kaddrs
;
1223 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1224 __func__
, sk
, addrs
, addrs_size
);
1226 if (unlikely(addrs_size
<= 0))
1229 /* Check the user passed a healthy pointer. */
1230 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1233 /* Alloc space for the address array in kernel memory. */
1234 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1235 if (unlikely(!kaddrs
))
1238 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1241 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, assoc_id
);
1250 * This is an older interface. It's kept for backward compatibility
1251 * to the option that doesn't provide association id.
1253 SCTP_STATIC
int sctp_setsockopt_connectx_old(struct sock
* sk
,
1254 struct sockaddr __user
*addrs
,
1257 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1261 * New interface for the API. The since the API is done with a socket
1262 * option, to make it simple we feed back the association id is as a return
1263 * indication to the call. Error is always negative and association id is
1266 SCTP_STATIC
int sctp_setsockopt_connectx(struct sock
* sk
,
1267 struct sockaddr __user
*addrs
,
1270 sctp_assoc_t assoc_id
= 0;
1273 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1282 * New (hopefully final) interface for the API.
1283 * We use the sctp_getaddrs_old structure so that use-space library
1284 * can avoid any unnecessary allocations. The only defferent part
1285 * is that we store the actual length of the address buffer into the
1286 * addrs_num structure member. That way we can re-use the existing
1289 SCTP_STATIC
int sctp_getsockopt_connectx3(struct sock
* sk
, int len
,
1290 char __user
*optval
,
1293 struct sctp_getaddrs_old param
;
1294 sctp_assoc_t assoc_id
= 0;
1297 if (len
< sizeof(param
))
1300 if (copy_from_user(¶m
, optval
, sizeof(param
)))
1303 err
= __sctp_setsockopt_connectx(sk
,
1304 (struct sockaddr __user
*)param
.addrs
,
1305 param
.addr_num
, &assoc_id
);
1307 if (err
== 0 || err
== -EINPROGRESS
) {
1308 if (copy_to_user(optval
, &assoc_id
, sizeof(assoc_id
)))
1310 if (put_user(sizeof(assoc_id
), optlen
))
1317 /* API 3.1.4 close() - UDP Style Syntax
1318 * Applications use close() to perform graceful shutdown (as described in
1319 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1320 * by a UDP-style socket.
1324 * ret = close(int sd);
1326 * sd - the socket descriptor of the associations to be closed.
1328 * To gracefully shutdown a specific association represented by the
1329 * UDP-style socket, an application should use the sendmsg() call,
1330 * passing no user data, but including the appropriate flag in the
1331 * ancillary data (see Section xxxx).
1333 * If sd in the close() call is a branched-off socket representing only
1334 * one association, the shutdown is performed on that association only.
1336 * 4.1.6 close() - TCP Style Syntax
1338 * Applications use close() to gracefully close down an association.
1342 * int close(int sd);
1344 * sd - the socket descriptor of the association to be closed.
1346 * After an application calls close() on a socket descriptor, no further
1347 * socket operations will succeed on that descriptor.
1349 * API 7.1.4 SO_LINGER
1351 * An application using the TCP-style socket can use this option to
1352 * perform the SCTP ABORT primitive. The linger option structure is:
1355 * int l_onoff; // option on/off
1356 * int l_linger; // linger time
1359 * To enable the option, set l_onoff to 1. If the l_linger value is set
1360 * to 0, calling close() is the same as the ABORT primitive. If the
1361 * value is set to a negative value, the setsockopt() call will return
1362 * an error. If the value is set to a positive value linger_time, the
1363 * close() can be blocked for at most linger_time ms. If the graceful
1364 * shutdown phase does not finish during this period, close() will
1365 * return but the graceful shutdown phase continues in the system.
1367 SCTP_STATIC
void sctp_close(struct sock
*sk
, long timeout
)
1369 struct sctp_endpoint
*ep
;
1370 struct sctp_association
*asoc
;
1371 struct list_head
*pos
, *temp
;
1373 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1376 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1377 sk
->sk_state
= SCTP_SS_CLOSING
;
1379 ep
= sctp_sk(sk
)->ep
;
1381 /* Walk all associations on an endpoint. */
1382 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1383 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1385 if (sctp_style(sk
, TCP
)) {
1386 /* A closed association can still be in the list if
1387 * it belongs to a TCP-style listening socket that is
1388 * not yet accepted. If so, free it. If not, send an
1389 * ABORT or SHUTDOWN based on the linger options.
1391 if (sctp_state(asoc
, CLOSED
)) {
1392 sctp_unhash_established(asoc
);
1393 sctp_association_free(asoc
);
1398 if (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
) {
1399 struct sctp_chunk
*chunk
;
1401 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1403 sctp_primitive_ABORT(asoc
, chunk
);
1405 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1408 /* Clean up any skbs sitting on the receive queue. */
1409 sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1410 sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1412 /* On a TCP-style socket, block for at most linger_time if set. */
1413 if (sctp_style(sk
, TCP
) && timeout
)
1414 sctp_wait_for_close(sk
, timeout
);
1416 /* This will run the backlog queue. */
1417 sctp_release_sock(sk
);
1419 /* Supposedly, no process has access to the socket, but
1420 * the net layers still may.
1422 sctp_local_bh_disable();
1423 sctp_bh_lock_sock(sk
);
1425 /* Hold the sock, since sk_common_release() will put sock_put()
1426 * and we have just a little more cleanup.
1429 sk_common_release(sk
);
1431 sctp_bh_unlock_sock(sk
);
1432 sctp_local_bh_enable();
1436 SCTP_DBG_OBJCNT_DEC(sock
);
1439 /* Handle EPIPE error. */
1440 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1443 err
= sock_error(sk
) ? : -EPIPE
;
1444 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1445 send_sig(SIGPIPE
, current
, 0);
1449 /* API 3.1.3 sendmsg() - UDP Style Syntax
1451 * An application uses sendmsg() and recvmsg() calls to transmit data to
1452 * and receive data from its peer.
1454 * ssize_t sendmsg(int socket, const struct msghdr *message,
1457 * socket - the socket descriptor of the endpoint.
1458 * message - pointer to the msghdr structure which contains a single
1459 * user message and possibly some ancillary data.
1461 * See Section 5 for complete description of the data
1464 * flags - flags sent or received with the user message, see Section
1465 * 5 for complete description of the flags.
1467 * Note: This function could use a rewrite especially when explicit
1468 * connect support comes in.
1470 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1472 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1474 SCTP_STATIC
int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1475 struct msghdr
*msg
, size_t msg_len
)
1477 struct sctp_sock
*sp
;
1478 struct sctp_endpoint
*ep
;
1479 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1480 struct sctp_transport
*transport
, *chunk_tp
;
1481 struct sctp_chunk
*chunk
;
1483 struct sockaddr
*msg_name
= NULL
;
1484 struct sctp_sndrcvinfo default_sinfo
= { 0 };
1485 struct sctp_sndrcvinfo
*sinfo
;
1486 struct sctp_initmsg
*sinit
;
1487 sctp_assoc_t associd
= 0;
1488 sctp_cmsgs_t cmsgs
= { NULL
};
1492 __u16 sinfo_flags
= 0;
1493 struct sctp_datamsg
*datamsg
;
1494 int msg_flags
= msg
->msg_flags
;
1496 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1503 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1505 /* We cannot send a message over a TCP-style listening socket. */
1506 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1511 /* Parse out the SCTP CMSGs. */
1512 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1515 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1519 /* Fetch the destination address for this packet. This
1520 * address only selects the association--it is not necessarily
1521 * the address we will send to.
1522 * For a peeled-off socket, msg_name is ignored.
1524 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1525 int msg_namelen
= msg
->msg_namelen
;
1527 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1532 if (msg_namelen
> sizeof(to
))
1533 msg_namelen
= sizeof(to
);
1534 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1535 msg_name
= msg
->msg_name
;
1541 /* Did the user specify SNDRCVINFO? */
1543 sinfo_flags
= sinfo
->sinfo_flags
;
1544 associd
= sinfo
->sinfo_assoc_id
;
1547 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1548 msg_len
, sinfo_flags
);
1550 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1551 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1556 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1557 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1558 * If SCTP_ABORT is set, the message length could be non zero with
1559 * the msg_iov set to the user abort reason.
1561 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1562 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1567 /* If SCTP_ADDR_OVER is set, there must be an address
1568 * specified in msg_name.
1570 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1577 SCTP_DEBUG_PRINTK("About to look up association.\n");
1581 /* If a msg_name has been specified, assume this is to be used. */
1583 /* Look for a matching association on the endpoint. */
1584 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1586 /* If we could not find a matching association on the
1587 * endpoint, make sure that it is not a TCP-style
1588 * socket that already has an association or there is
1589 * no peeled-off association on another socket.
1591 if ((sctp_style(sk
, TCP
) &&
1592 sctp_sstate(sk
, ESTABLISHED
)) ||
1593 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1594 err
= -EADDRNOTAVAIL
;
1599 asoc
= sctp_id2assoc(sk
, associd
);
1607 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1609 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1610 * socket that has an association in CLOSED state. This can
1611 * happen when an accepted socket has an association that is
1614 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1619 if (sinfo_flags
& SCTP_EOF
) {
1620 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1622 sctp_primitive_SHUTDOWN(asoc
, NULL
);
1626 if (sinfo_flags
& SCTP_ABORT
) {
1628 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1634 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1635 sctp_primitive_ABORT(asoc
, chunk
);
1641 /* Do we need to create the association? */
1643 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1645 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1650 /* Check for invalid stream against the stream counts,
1651 * either the default or the user specified stream counts.
1654 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1655 /* Check against the defaults. */
1656 if (sinfo
->sinfo_stream
>=
1657 sp
->initmsg
.sinit_num_ostreams
) {
1662 /* Check against the requested. */
1663 if (sinfo
->sinfo_stream
>=
1664 sinit
->sinit_num_ostreams
) {
1672 * API 3.1.2 bind() - UDP Style Syntax
1673 * If a bind() or sctp_bindx() is not called prior to a
1674 * sendmsg() call that initiates a new association, the
1675 * system picks an ephemeral port and will choose an address
1676 * set equivalent to binding with a wildcard address.
1678 if (!ep
->base
.bind_addr
.port
) {
1679 if (sctp_autobind(sk
)) {
1685 * If an unprivileged user inherits a one-to-many
1686 * style socket with open associations on a privileged
1687 * port, it MAY be permitted to accept new associations,
1688 * but it SHOULD NOT be permitted to open new
1691 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1692 !capable(CAP_NET_BIND_SERVICE
)) {
1698 scope
= sctp_scope(&to
);
1699 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1705 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
, GFP_KERNEL
);
1711 /* If the SCTP_INIT ancillary data is specified, set all
1712 * the association init values accordingly.
1715 if (sinit
->sinit_num_ostreams
) {
1716 asoc
->c
.sinit_num_ostreams
=
1717 sinit
->sinit_num_ostreams
;
1719 if (sinit
->sinit_max_instreams
) {
1720 asoc
->c
.sinit_max_instreams
=
1721 sinit
->sinit_max_instreams
;
1723 if (sinit
->sinit_max_attempts
) {
1724 asoc
->max_init_attempts
1725 = sinit
->sinit_max_attempts
;
1727 if (sinit
->sinit_max_init_timeo
) {
1728 asoc
->max_init_timeo
=
1729 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1733 /* Prime the peer's transport structures. */
1734 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1741 /* ASSERT: we have a valid association at this point. */
1742 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1745 /* If the user didn't specify SNDRCVINFO, make up one with
1748 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1749 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1750 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1751 default_sinfo
.sinfo_context
= asoc
->default_context
;
1752 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1753 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1754 sinfo
= &default_sinfo
;
1757 /* API 7.1.7, the sndbuf size per association bounds the
1758 * maximum size of data that can be sent in a single send call.
1760 if (msg_len
> sk
->sk_sndbuf
) {
1765 if (asoc
->pmtu_pending
)
1766 sctp_assoc_pending_pmtu(asoc
);
1768 /* If fragmentation is disabled and the message length exceeds the
1769 * association fragmentation point, return EMSGSIZE. The I-D
1770 * does not specify what this error is, but this looks like
1773 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1779 /* Check for invalid stream. */
1780 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1786 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1787 if (!sctp_wspace(asoc
)) {
1788 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1793 /* If an address is passed with the sendto/sendmsg call, it is used
1794 * to override the primary destination address in the TCP model, or
1795 * when SCTP_ADDR_OVER flag is set in the UDP model.
1797 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1798 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1799 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1807 /* Auto-connect, if we aren't connected already. */
1808 if (sctp_state(asoc
, CLOSED
)) {
1809 err
= sctp_primitive_ASSOCIATE(asoc
, NULL
);
1812 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1815 /* Break the message into multiple chunks of maximum size. */
1816 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1822 /* Now send the (possibly) fragmented message. */
1823 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1824 sctp_chunk_hold(chunk
);
1826 /* Do accounting for the write space. */
1827 sctp_set_owner_w(chunk
);
1829 chunk
->transport
= chunk_tp
;
1832 /* Send it to the lower layers. Note: all chunks
1833 * must either fail or succeed. The lower layer
1834 * works that way today. Keep it that way or this
1837 err
= sctp_primitive_SEND(asoc
, datamsg
);
1838 /* Did the lower layer accept the chunk? */
1840 sctp_datamsg_free(datamsg
);
1842 sctp_datamsg_put(datamsg
);
1844 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1851 /* If we are already past ASSOCIATE, the lower
1852 * layers are responsible for association cleanup.
1858 sctp_association_free(asoc
);
1860 sctp_release_sock(sk
);
1863 return sctp_error(sk
, msg_flags
, err
);
1870 err
= sock_error(sk
);
1880 /* This is an extended version of skb_pull() that removes the data from the
1881 * start of a skb even when data is spread across the list of skb's in the
1882 * frag_list. len specifies the total amount of data that needs to be removed.
1883 * when 'len' bytes could be removed from the skb, it returns 0.
1884 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1885 * could not be removed.
1887 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1889 struct sk_buff
*list
;
1890 int skb_len
= skb_headlen(skb
);
1893 if (len
<= skb_len
) {
1894 __skb_pull(skb
, len
);
1898 __skb_pull(skb
, skb_len
);
1900 skb_walk_frags(skb
, list
) {
1901 rlen
= sctp_skb_pull(list
, len
);
1902 skb
->len
-= (len
-rlen
);
1903 skb
->data_len
-= (len
-rlen
);
1914 /* API 3.1.3 recvmsg() - UDP Style Syntax
1916 * ssize_t recvmsg(int socket, struct msghdr *message,
1919 * socket - the socket descriptor of the endpoint.
1920 * message - pointer to the msghdr structure which contains a single
1921 * user message and possibly some ancillary data.
1923 * See Section 5 for complete description of the data
1926 * flags - flags sent or received with the user message, see Section
1927 * 5 for complete description of the flags.
1929 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
1931 SCTP_STATIC
int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
1932 struct msghdr
*msg
, size_t len
, int noblock
,
1933 int flags
, int *addr_len
)
1935 struct sctp_ulpevent
*event
= NULL
;
1936 struct sctp_sock
*sp
= sctp_sk(sk
);
1937 struct sk_buff
*skb
;
1942 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1943 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
1944 "len", len
, "knoblauch", noblock
,
1945 "flags", flags
, "addr_len", addr_len
);
1949 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
1954 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
1958 /* Get the total length of the skb including any skb's in the
1967 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1969 event
= sctp_skb2event(skb
);
1974 sock_recv_ts_and_drops(msg
, sk
, skb
);
1975 if (sctp_ulpevent_is_notification(event
)) {
1976 msg
->msg_flags
|= MSG_NOTIFICATION
;
1977 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
1979 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
1982 /* Check if we allow SCTP_SNDRCVINFO. */
1983 if (sp
->subscribe
.sctp_data_io_event
)
1984 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
1986 /* FIXME: we should be calling IP/IPv6 layers. */
1987 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
1988 ip_cmsg_recv(msg
, skb
);
1993 /* If skb's length exceeds the user's buffer, update the skb and
1994 * push it back to the receive_queue so that the next call to
1995 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1997 if (skb_len
> copied
) {
1998 msg
->msg_flags
&= ~MSG_EOR
;
1999 if (flags
& MSG_PEEK
)
2001 sctp_skb_pull(skb
, copied
);
2002 skb_queue_head(&sk
->sk_receive_queue
, skb
);
2004 /* When only partial message is copied to the user, increase
2005 * rwnd by that amount. If all the data in the skb is read,
2006 * rwnd is updated when the event is freed.
2008 if (!sctp_ulpevent_is_notification(event
))
2009 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
2011 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
2012 (event
->msg_flags
& MSG_EOR
))
2013 msg
->msg_flags
|= MSG_EOR
;
2015 msg
->msg_flags
&= ~MSG_EOR
;
2018 if (flags
& MSG_PEEK
) {
2019 /* Release the skb reference acquired after peeking the skb in
2020 * sctp_skb_recv_datagram().
2024 /* Free the event which includes releasing the reference to
2025 * the owner of the skb, freeing the skb and updating the
2028 sctp_ulpevent_free(event
);
2031 sctp_release_sock(sk
);
2035 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2037 * This option is a on/off flag. If enabled no SCTP message
2038 * fragmentation will be performed. Instead if a message being sent
2039 * exceeds the current PMTU size, the message will NOT be sent and
2040 * instead a error will be indicated to the user.
2042 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
2043 char __user
*optval
,
2044 unsigned int optlen
)
2048 if (optlen
< sizeof(int))
2051 if (get_user(val
, (int __user
*)optval
))
2054 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
2059 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2060 unsigned int optlen
)
2062 if (optlen
> sizeof(struct sctp_event_subscribe
))
2064 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2069 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2071 * This socket option is applicable to the UDP-style socket only. When
2072 * set it will cause associations that are idle for more than the
2073 * specified number of seconds to automatically close. An association
2074 * being idle is defined an association that has NOT sent or received
2075 * user data. The special value of '0' indicates that no automatic
2076 * close of any associations should be performed. The option expects an
2077 * integer defining the number of seconds of idle time before an
2078 * association is closed.
2080 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2081 unsigned int optlen
)
2083 struct sctp_sock
*sp
= sctp_sk(sk
);
2085 /* Applicable to UDP-style socket only */
2086 if (sctp_style(sk
, TCP
))
2088 if (optlen
!= sizeof(int))
2090 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2092 /* make sure it won't exceed MAX_SCHEDULE_TIMEOUT */
2093 sp
->autoclose
= min_t(long, sp
->autoclose
, MAX_SCHEDULE_TIMEOUT
/ HZ
);
2098 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2100 * Applications can enable or disable heartbeats for any peer address of
2101 * an association, modify an address's heartbeat interval, force a
2102 * heartbeat to be sent immediately, and adjust the address's maximum
2103 * number of retransmissions sent before an address is considered
2104 * unreachable. The following structure is used to access and modify an
2105 * address's parameters:
2107 * struct sctp_paddrparams {
2108 * sctp_assoc_t spp_assoc_id;
2109 * struct sockaddr_storage spp_address;
2110 * uint32_t spp_hbinterval;
2111 * uint16_t spp_pathmaxrxt;
2112 * uint32_t spp_pathmtu;
2113 * uint32_t spp_sackdelay;
2114 * uint32_t spp_flags;
2117 * spp_assoc_id - (one-to-many style socket) This is filled in the
2118 * application, and identifies the association for
2120 * spp_address - This specifies which address is of interest.
2121 * spp_hbinterval - This contains the value of the heartbeat interval,
2122 * in milliseconds. If a value of zero
2123 * is present in this field then no changes are to
2124 * be made to this parameter.
2125 * spp_pathmaxrxt - This contains the maximum number of
2126 * retransmissions before this address shall be
2127 * considered unreachable. If a value of zero
2128 * is present in this field then no changes are to
2129 * be made to this parameter.
2130 * spp_pathmtu - When Path MTU discovery is disabled the value
2131 * specified here will be the "fixed" path mtu.
2132 * Note that if the spp_address field is empty
2133 * then all associations on this address will
2134 * have this fixed path mtu set upon them.
2136 * spp_sackdelay - When delayed sack is enabled, this value specifies
2137 * the number of milliseconds that sacks will be delayed
2138 * for. This value will apply to all addresses of an
2139 * association if the spp_address field is empty. Note
2140 * also, that if delayed sack is enabled and this
2141 * value is set to 0, no change is made to the last
2142 * recorded delayed sack timer value.
2144 * spp_flags - These flags are used to control various features
2145 * on an association. The flag field may contain
2146 * zero or more of the following options.
2148 * SPP_HB_ENABLE - Enable heartbeats on the
2149 * specified address. Note that if the address
2150 * field is empty all addresses for the association
2151 * have heartbeats enabled upon them.
2153 * SPP_HB_DISABLE - Disable heartbeats on the
2154 * speicifed address. Note that if the address
2155 * field is empty all addresses for the association
2156 * will have their heartbeats disabled. Note also
2157 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2158 * mutually exclusive, only one of these two should
2159 * be specified. Enabling both fields will have
2160 * undetermined results.
2162 * SPP_HB_DEMAND - Request a user initiated heartbeat
2163 * to be made immediately.
2165 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2166 * heartbeat delayis to be set to the value of 0
2169 * SPP_PMTUD_ENABLE - This field will enable PMTU
2170 * discovery upon the specified address. Note that
2171 * if the address feild is empty then all addresses
2172 * on the association are effected.
2174 * SPP_PMTUD_DISABLE - This field will disable PMTU
2175 * discovery upon the specified address. Note that
2176 * if the address feild is empty then all addresses
2177 * on the association are effected. Not also that
2178 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2179 * exclusive. Enabling both will have undetermined
2182 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2183 * on delayed sack. The time specified in spp_sackdelay
2184 * is used to specify the sack delay for this address. Note
2185 * that if spp_address is empty then all addresses will
2186 * enable delayed sack and take on the sack delay
2187 * value specified in spp_sackdelay.
2188 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2189 * off delayed sack. If the spp_address field is blank then
2190 * delayed sack is disabled for the entire association. Note
2191 * also that this field is mutually exclusive to
2192 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2195 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2196 struct sctp_transport
*trans
,
2197 struct sctp_association
*asoc
,
2198 struct sctp_sock
*sp
,
2201 int sackdelay_change
)
2205 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2206 error
= sctp_primitive_REQUESTHEARTBEAT (trans
->asoc
, trans
);
2211 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2212 * this field is ignored. Note also that a value of zero indicates
2213 * the current setting should be left unchanged.
2215 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2217 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2218 * set. This lets us use 0 value when this flag
2221 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2222 params
->spp_hbinterval
= 0;
2224 if (params
->spp_hbinterval
||
2225 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2228 msecs_to_jiffies(params
->spp_hbinterval
);
2231 msecs_to_jiffies(params
->spp_hbinterval
);
2233 sp
->hbinterval
= params
->spp_hbinterval
;
2240 trans
->param_flags
=
2241 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2244 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2247 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2251 /* When Path MTU discovery is disabled the value specified here will
2252 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2253 * include the flag SPP_PMTUD_DISABLE for this field to have any
2256 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2258 trans
->pathmtu
= params
->spp_pathmtu
;
2259 sctp_assoc_sync_pmtu(asoc
);
2261 asoc
->pathmtu
= params
->spp_pathmtu
;
2262 sctp_frag_point(asoc
, params
->spp_pathmtu
);
2264 sp
->pathmtu
= params
->spp_pathmtu
;
2270 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2271 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2272 trans
->param_flags
=
2273 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2275 sctp_transport_pmtu(trans
);
2276 sctp_assoc_sync_pmtu(asoc
);
2280 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2283 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2287 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2288 * value of this field is ignored. Note also that a value of zero
2289 * indicates the current setting should be left unchanged.
2291 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2294 msecs_to_jiffies(params
->spp_sackdelay
);
2297 msecs_to_jiffies(params
->spp_sackdelay
);
2299 sp
->sackdelay
= params
->spp_sackdelay
;
2303 if (sackdelay_change
) {
2305 trans
->param_flags
=
2306 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2310 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2314 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2319 /* Note that a value of zero indicates the current setting should be
2322 if (params
->spp_pathmaxrxt
) {
2324 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2326 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2328 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2335 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2336 char __user
*optval
,
2337 unsigned int optlen
)
2339 struct sctp_paddrparams params
;
2340 struct sctp_transport
*trans
= NULL
;
2341 struct sctp_association
*asoc
= NULL
;
2342 struct sctp_sock
*sp
= sctp_sk(sk
);
2344 int hb_change
, pmtud_change
, sackdelay_change
;
2346 if (optlen
!= sizeof(struct sctp_paddrparams
))
2349 if (copy_from_user(¶ms
, optval
, optlen
))
2352 /* Validate flags and value parameters. */
2353 hb_change
= params
.spp_flags
& SPP_HB
;
2354 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2355 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2357 if (hb_change
== SPP_HB
||
2358 pmtud_change
== SPP_PMTUD
||
2359 sackdelay_change
== SPP_SACKDELAY
||
2360 params
.spp_sackdelay
> 500 ||
2361 (params
.spp_pathmtu
&&
2362 params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2365 /* If an address other than INADDR_ANY is specified, and
2366 * no transport is found, then the request is invalid.
2368 if (!sctp_is_any(sk
, ( union sctp_addr
*)¶ms
.spp_address
)) {
2369 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2370 params
.spp_assoc_id
);
2375 /* Get association, if assoc_id != 0 and the socket is a one
2376 * to many style socket, and an association was not found, then
2377 * the id was invalid.
2379 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2380 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2383 /* Heartbeat demand can only be sent on a transport or
2384 * association, but not a socket.
2386 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2389 /* Process parameters. */
2390 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2391 hb_change
, pmtud_change
,
2397 /* If changes are for association, also apply parameters to each
2400 if (!trans
&& asoc
) {
2401 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2403 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2404 hb_change
, pmtud_change
,
2413 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2415 * This option will effect the way delayed acks are performed. This
2416 * option allows you to get or set the delayed ack time, in
2417 * milliseconds. It also allows changing the delayed ack frequency.
2418 * Changing the frequency to 1 disables the delayed sack algorithm. If
2419 * the assoc_id is 0, then this sets or gets the endpoints default
2420 * values. If the assoc_id field is non-zero, then the set or get
2421 * effects the specified association for the one to many model (the
2422 * assoc_id field is ignored by the one to one model). Note that if
2423 * sack_delay or sack_freq are 0 when setting this option, then the
2424 * current values will remain unchanged.
2426 * struct sctp_sack_info {
2427 * sctp_assoc_t sack_assoc_id;
2428 * uint32_t sack_delay;
2429 * uint32_t sack_freq;
2432 * sack_assoc_id - This parameter, indicates which association the user
2433 * is performing an action upon. Note that if this field's value is
2434 * zero then the endpoints default value is changed (effecting future
2435 * associations only).
2437 * sack_delay - This parameter contains the number of milliseconds that
2438 * the user is requesting the delayed ACK timer be set to. Note that
2439 * this value is defined in the standard to be between 200 and 500
2442 * sack_freq - This parameter contains the number of packets that must
2443 * be received before a sack is sent without waiting for the delay
2444 * timer to expire. The default value for this is 2, setting this
2445 * value to 1 will disable the delayed sack algorithm.
2448 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2449 char __user
*optval
, unsigned int optlen
)
2451 struct sctp_sack_info params
;
2452 struct sctp_transport
*trans
= NULL
;
2453 struct sctp_association
*asoc
= NULL
;
2454 struct sctp_sock
*sp
= sctp_sk(sk
);
2456 if (optlen
== sizeof(struct sctp_sack_info
)) {
2457 if (copy_from_user(¶ms
, optval
, optlen
))
2460 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2462 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2463 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2464 pr_warn("Use struct sctp_sack_info instead\n");
2465 if (copy_from_user(¶ms
, optval
, optlen
))
2468 if (params
.sack_delay
== 0)
2469 params
.sack_freq
= 1;
2471 params
.sack_freq
= 0;
2475 /* Validate value parameter. */
2476 if (params
.sack_delay
> 500)
2479 /* Get association, if sack_assoc_id != 0 and the socket is a one
2480 * to many style socket, and an association was not found, then
2481 * the id was invalid.
2483 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2484 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2487 if (params
.sack_delay
) {
2490 msecs_to_jiffies(params
.sack_delay
);
2492 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2493 SPP_SACKDELAY_ENABLE
;
2495 sp
->sackdelay
= params
.sack_delay
;
2497 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2498 SPP_SACKDELAY_ENABLE
;
2502 if (params
.sack_freq
== 1) {
2505 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2506 SPP_SACKDELAY_DISABLE
;
2509 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2510 SPP_SACKDELAY_DISABLE
;
2512 } else if (params
.sack_freq
> 1) {
2514 asoc
->sackfreq
= params
.sack_freq
;
2516 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2517 SPP_SACKDELAY_ENABLE
;
2519 sp
->sackfreq
= params
.sack_freq
;
2521 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2522 SPP_SACKDELAY_ENABLE
;
2526 /* If change is for association, also apply to each transport. */
2528 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2530 if (params
.sack_delay
) {
2532 msecs_to_jiffies(params
.sack_delay
);
2533 trans
->param_flags
=
2534 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2535 SPP_SACKDELAY_ENABLE
;
2537 if (params
.sack_freq
== 1) {
2538 trans
->param_flags
=
2539 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2540 SPP_SACKDELAY_DISABLE
;
2541 } else if (params
.sack_freq
> 1) {
2542 trans
->sackfreq
= params
.sack_freq
;
2543 trans
->param_flags
=
2544 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2545 SPP_SACKDELAY_ENABLE
;
2553 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2555 * Applications can specify protocol parameters for the default association
2556 * initialization. The option name argument to setsockopt() and getsockopt()
2559 * Setting initialization parameters is effective only on an unconnected
2560 * socket (for UDP-style sockets only future associations are effected
2561 * by the change). With TCP-style sockets, this option is inherited by
2562 * sockets derived from a listener socket.
2564 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2566 struct sctp_initmsg sinit
;
2567 struct sctp_sock
*sp
= sctp_sk(sk
);
2569 if (optlen
!= sizeof(struct sctp_initmsg
))
2571 if (copy_from_user(&sinit
, optval
, optlen
))
2574 if (sinit
.sinit_num_ostreams
)
2575 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2576 if (sinit
.sinit_max_instreams
)
2577 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2578 if (sinit
.sinit_max_attempts
)
2579 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2580 if (sinit
.sinit_max_init_timeo
)
2581 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2587 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2589 * Applications that wish to use the sendto() system call may wish to
2590 * specify a default set of parameters that would normally be supplied
2591 * through the inclusion of ancillary data. This socket option allows
2592 * such an application to set the default sctp_sndrcvinfo structure.
2593 * The application that wishes to use this socket option simply passes
2594 * in to this call the sctp_sndrcvinfo structure defined in Section
2595 * 5.2.2) The input parameters accepted by this call include
2596 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2597 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2598 * to this call if the caller is using the UDP model.
2600 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2601 char __user
*optval
,
2602 unsigned int optlen
)
2604 struct sctp_sndrcvinfo info
;
2605 struct sctp_association
*asoc
;
2606 struct sctp_sock
*sp
= sctp_sk(sk
);
2608 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2610 if (copy_from_user(&info
, optval
, optlen
))
2613 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2614 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2618 asoc
->default_stream
= info
.sinfo_stream
;
2619 asoc
->default_flags
= info
.sinfo_flags
;
2620 asoc
->default_ppid
= info
.sinfo_ppid
;
2621 asoc
->default_context
= info
.sinfo_context
;
2622 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2624 sp
->default_stream
= info
.sinfo_stream
;
2625 sp
->default_flags
= info
.sinfo_flags
;
2626 sp
->default_ppid
= info
.sinfo_ppid
;
2627 sp
->default_context
= info
.sinfo_context
;
2628 sp
->default_timetolive
= info
.sinfo_timetolive
;
2634 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2636 * Requests that the local SCTP stack use the enclosed peer address as
2637 * the association primary. The enclosed address must be one of the
2638 * association peer's addresses.
2640 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2641 unsigned int optlen
)
2643 struct sctp_prim prim
;
2644 struct sctp_transport
*trans
;
2646 if (optlen
!= sizeof(struct sctp_prim
))
2649 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2652 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2656 sctp_assoc_set_primary(trans
->asoc
, trans
);
2662 * 7.1.5 SCTP_NODELAY
2664 * Turn on/off any Nagle-like algorithm. This means that packets are
2665 * generally sent as soon as possible and no unnecessary delays are
2666 * introduced, at the cost of more packets in the network. Expects an
2667 * integer boolean flag.
2669 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2670 unsigned int optlen
)
2674 if (optlen
< sizeof(int))
2676 if (get_user(val
, (int __user
*)optval
))
2679 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2685 * 7.1.1 SCTP_RTOINFO
2687 * The protocol parameters used to initialize and bound retransmission
2688 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2689 * and modify these parameters.
2690 * All parameters are time values, in milliseconds. A value of 0, when
2691 * modifying the parameters, indicates that the current value should not
2695 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2697 struct sctp_rtoinfo rtoinfo
;
2698 struct sctp_association
*asoc
;
2700 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2703 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2706 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2708 /* Set the values to the specific association */
2709 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2713 if (rtoinfo
.srto_initial
!= 0)
2715 msecs_to_jiffies(rtoinfo
.srto_initial
);
2716 if (rtoinfo
.srto_max
!= 0)
2717 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2718 if (rtoinfo
.srto_min
!= 0)
2719 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2721 /* If there is no association or the association-id = 0
2722 * set the values to the endpoint.
2724 struct sctp_sock
*sp
= sctp_sk(sk
);
2726 if (rtoinfo
.srto_initial
!= 0)
2727 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2728 if (rtoinfo
.srto_max
!= 0)
2729 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2730 if (rtoinfo
.srto_min
!= 0)
2731 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2739 * 7.1.2 SCTP_ASSOCINFO
2741 * This option is used to tune the maximum retransmission attempts
2742 * of the association.
2743 * Returns an error if the new association retransmission value is
2744 * greater than the sum of the retransmission value of the peer.
2745 * See [SCTP] for more information.
2748 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2751 struct sctp_assocparams assocparams
;
2752 struct sctp_association
*asoc
;
2754 if (optlen
!= sizeof(struct sctp_assocparams
))
2756 if (copy_from_user(&assocparams
, optval
, optlen
))
2759 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2761 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2764 /* Set the values to the specific association */
2766 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2769 struct sctp_transport
*peer_addr
;
2771 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
2773 path_sum
+= peer_addr
->pathmaxrxt
;
2777 /* Only validate asocmaxrxt if we have more than
2778 * one path/transport. We do this because path
2779 * retransmissions are only counted when we have more
2783 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2786 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2789 if (assocparams
.sasoc_cookie_life
!= 0) {
2790 asoc
->cookie_life
.tv_sec
=
2791 assocparams
.sasoc_cookie_life
/ 1000;
2792 asoc
->cookie_life
.tv_usec
=
2793 (assocparams
.sasoc_cookie_life
% 1000)
2797 /* Set the values to the endpoint */
2798 struct sctp_sock
*sp
= sctp_sk(sk
);
2800 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2801 sp
->assocparams
.sasoc_asocmaxrxt
=
2802 assocparams
.sasoc_asocmaxrxt
;
2803 if (assocparams
.sasoc_cookie_life
!= 0)
2804 sp
->assocparams
.sasoc_cookie_life
=
2805 assocparams
.sasoc_cookie_life
;
2811 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2813 * This socket option is a boolean flag which turns on or off mapped V4
2814 * addresses. If this option is turned on and the socket is type
2815 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2816 * If this option is turned off, then no mapping will be done of V4
2817 * addresses and a user will receive both PF_INET6 and PF_INET type
2818 * addresses on the socket.
2820 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2823 struct sctp_sock
*sp
= sctp_sk(sk
);
2825 if (optlen
< sizeof(int))
2827 if (get_user(val
, (int __user
*)optval
))
2838 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2839 * This option will get or set the maximum size to put in any outgoing
2840 * SCTP DATA chunk. If a message is larger than this size it will be
2841 * fragmented by SCTP into the specified size. Note that the underlying
2842 * SCTP implementation may fragment into smaller sized chunks when the
2843 * PMTU of the underlying association is smaller than the value set by
2844 * the user. The default value for this option is '0' which indicates
2845 * the user is NOT limiting fragmentation and only the PMTU will effect
2846 * SCTP's choice of DATA chunk size. Note also that values set larger
2847 * than the maximum size of an IP datagram will effectively let SCTP
2848 * control fragmentation (i.e. the same as setting this option to 0).
2850 * The following structure is used to access and modify this parameter:
2852 * struct sctp_assoc_value {
2853 * sctp_assoc_t assoc_id;
2854 * uint32_t assoc_value;
2857 * assoc_id: This parameter is ignored for one-to-one style sockets.
2858 * For one-to-many style sockets this parameter indicates which
2859 * association the user is performing an action upon. Note that if
2860 * this field's value is zero then the endpoints default value is
2861 * changed (effecting future associations only).
2862 * assoc_value: This parameter specifies the maximum size in bytes.
2864 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2866 struct sctp_assoc_value params
;
2867 struct sctp_association
*asoc
;
2868 struct sctp_sock
*sp
= sctp_sk(sk
);
2871 if (optlen
== sizeof(int)) {
2872 pr_warn("Use of int in maxseg socket option deprecated\n");
2873 pr_warn("Use struct sctp_assoc_value instead\n");
2874 if (copy_from_user(&val
, optval
, optlen
))
2876 params
.assoc_id
= 0;
2877 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2878 if (copy_from_user(¶ms
, optval
, optlen
))
2880 val
= params
.assoc_value
;
2884 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
2887 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
2888 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
2893 val
= asoc
->pathmtu
;
2894 val
-= sp
->pf
->af
->net_header_len
;
2895 val
-= sizeof(struct sctphdr
) +
2896 sizeof(struct sctp_data_chunk
);
2898 asoc
->user_frag
= val
;
2899 asoc
->frag_point
= sctp_frag_point(asoc
, asoc
->pathmtu
);
2901 sp
->user_frag
= val
;
2909 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2911 * Requests that the peer mark the enclosed address as the association
2912 * primary. The enclosed address must be one of the association's
2913 * locally bound addresses. The following structure is used to make a
2914 * set primary request:
2916 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
2917 unsigned int optlen
)
2919 struct sctp_sock
*sp
;
2920 struct sctp_endpoint
*ep
;
2921 struct sctp_association
*asoc
= NULL
;
2922 struct sctp_setpeerprim prim
;
2923 struct sctp_chunk
*chunk
;
2929 if (!sctp_addip_enable
)
2932 if (optlen
!= sizeof(struct sctp_setpeerprim
))
2935 if (copy_from_user(&prim
, optval
, optlen
))
2938 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
2942 if (!asoc
->peer
.asconf_capable
)
2945 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
2948 if (!sctp_state(asoc
, ESTABLISHED
))
2951 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
2952 return -EADDRNOTAVAIL
;
2954 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2955 chunk
= sctp_make_asconf_set_prim(asoc
,
2956 (union sctp_addr
*)&prim
.sspp_addr
);
2960 err
= sctp_send_asconf(asoc
, chunk
);
2962 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2967 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
2968 unsigned int optlen
)
2970 struct sctp_setadaptation adaptation
;
2972 if (optlen
!= sizeof(struct sctp_setadaptation
))
2974 if (copy_from_user(&adaptation
, optval
, optlen
))
2977 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
2983 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2985 * The context field in the sctp_sndrcvinfo structure is normally only
2986 * used when a failed message is retrieved holding the value that was
2987 * sent down on the actual send call. This option allows the setting of
2988 * a default context on an association basis that will be received on
2989 * reading messages from the peer. This is especially helpful in the
2990 * one-2-many model for an application to keep some reference to an
2991 * internal state machine that is processing messages on the
2992 * association. Note that the setting of this value only effects
2993 * received messages from the peer and does not effect the value that is
2994 * saved with outbound messages.
2996 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
2997 unsigned int optlen
)
2999 struct sctp_assoc_value params
;
3000 struct sctp_sock
*sp
;
3001 struct sctp_association
*asoc
;
3003 if (optlen
!= sizeof(struct sctp_assoc_value
))
3005 if (copy_from_user(¶ms
, optval
, optlen
))
3010 if (params
.assoc_id
!= 0) {
3011 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3014 asoc
->default_rcv_context
= params
.assoc_value
;
3016 sp
->default_rcv_context
= params
.assoc_value
;
3023 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3025 * This options will at a minimum specify if the implementation is doing
3026 * fragmented interleave. Fragmented interleave, for a one to many
3027 * socket, is when subsequent calls to receive a message may return
3028 * parts of messages from different associations. Some implementations
3029 * may allow you to turn this value on or off. If so, when turned off,
3030 * no fragment interleave will occur (which will cause a head of line
3031 * blocking amongst multiple associations sharing the same one to many
3032 * socket). When this option is turned on, then each receive call may
3033 * come from a different association (thus the user must receive data
3034 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3035 * association each receive belongs to.
3037 * This option takes a boolean value. A non-zero value indicates that
3038 * fragmented interleave is on. A value of zero indicates that
3039 * fragmented interleave is off.
3041 * Note that it is important that an implementation that allows this
3042 * option to be turned on, have it off by default. Otherwise an unaware
3043 * application using the one to many model may become confused and act
3046 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
3047 char __user
*optval
,
3048 unsigned int optlen
)
3052 if (optlen
!= sizeof(int))
3054 if (get_user(val
, (int __user
*)optval
))
3057 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
3063 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3064 * (SCTP_PARTIAL_DELIVERY_POINT)
3066 * This option will set or get the SCTP partial delivery point. This
3067 * point is the size of a message where the partial delivery API will be
3068 * invoked to help free up rwnd space for the peer. Setting this to a
3069 * lower value will cause partial deliveries to happen more often. The
3070 * calls argument is an integer that sets or gets the partial delivery
3071 * point. Note also that the call will fail if the user attempts to set
3072 * this value larger than the socket receive buffer size.
3074 * Note that any single message having a length smaller than or equal to
3075 * the SCTP partial delivery point will be delivered in one single read
3076 * call as long as the user provided buffer is large enough to hold the
3079 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
3080 char __user
*optval
,
3081 unsigned int optlen
)
3085 if (optlen
!= sizeof(u32
))
3087 if (get_user(val
, (int __user
*)optval
))
3090 /* Note: We double the receive buffer from what the user sets
3091 * it to be, also initial rwnd is based on rcvbuf/2.
3093 if (val
> (sk
->sk_rcvbuf
>> 1))
3096 sctp_sk(sk
)->pd_point
= val
;
3098 return 0; /* is this the right error code? */
3102 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3104 * This option will allow a user to change the maximum burst of packets
3105 * that can be emitted by this association. Note that the default value
3106 * is 4, and some implementations may restrict this setting so that it
3107 * can only be lowered.
3109 * NOTE: This text doesn't seem right. Do this on a socket basis with
3110 * future associations inheriting the socket value.
3112 static int sctp_setsockopt_maxburst(struct sock
*sk
,
3113 char __user
*optval
,
3114 unsigned int optlen
)
3116 struct sctp_assoc_value params
;
3117 struct sctp_sock
*sp
;
3118 struct sctp_association
*asoc
;
3122 if (optlen
== sizeof(int)) {
3123 pr_warn("Use of int in max_burst socket option deprecated\n");
3124 pr_warn("Use struct sctp_assoc_value instead\n");
3125 if (copy_from_user(&val
, optval
, optlen
))
3127 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3128 if (copy_from_user(¶ms
, optval
, optlen
))
3130 val
= params
.assoc_value
;
3131 assoc_id
= params
.assoc_id
;
3137 if (assoc_id
!= 0) {
3138 asoc
= sctp_id2assoc(sk
, assoc_id
);
3141 asoc
->max_burst
= val
;
3143 sp
->max_burst
= val
;
3149 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3151 * This set option adds a chunk type that the user is requesting to be
3152 * received only in an authenticated way. Changes to the list of chunks
3153 * will only effect future associations on the socket.
3155 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
3156 char __user
*optval
,
3157 unsigned int optlen
)
3159 struct sctp_authchunk val
;
3161 if (!sctp_auth_enable
)
3164 if (optlen
!= sizeof(struct sctp_authchunk
))
3166 if (copy_from_user(&val
, optval
, optlen
))
3169 switch (val
.sauth_chunk
) {
3171 case SCTP_CID_INIT_ACK
:
3172 case SCTP_CID_SHUTDOWN_COMPLETE
:
3177 /* add this chunk id to the endpoint */
3178 return sctp_auth_ep_add_chunkid(sctp_sk(sk
)->ep
, val
.sauth_chunk
);
3182 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3184 * This option gets or sets the list of HMAC algorithms that the local
3185 * endpoint requires the peer to use.
3187 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
3188 char __user
*optval
,
3189 unsigned int optlen
)
3191 struct sctp_hmacalgo
*hmacs
;
3195 if (!sctp_auth_enable
)
3198 if (optlen
< sizeof(struct sctp_hmacalgo
))
3201 hmacs
= kmalloc(optlen
, GFP_KERNEL
);
3205 if (copy_from_user(hmacs
, optval
, optlen
)) {
3210 idents
= hmacs
->shmac_num_idents
;
3211 if (idents
== 0 || idents
> SCTP_AUTH_NUM_HMACS
||
3212 (idents
* sizeof(u16
)) > (optlen
- sizeof(struct sctp_hmacalgo
))) {
3217 err
= sctp_auth_ep_set_hmacs(sctp_sk(sk
)->ep
, hmacs
);
3224 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3226 * This option will set a shared secret key which is used to build an
3227 * association shared key.
3229 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3230 char __user
*optval
,
3231 unsigned int optlen
)
3233 struct sctp_authkey
*authkey
;
3234 struct sctp_association
*asoc
;
3237 if (!sctp_auth_enable
)
3240 if (optlen
<= sizeof(struct sctp_authkey
))
3243 authkey
= kmalloc(optlen
, GFP_KERNEL
);
3247 if (copy_from_user(authkey
, optval
, optlen
)) {
3252 if (authkey
->sca_keylength
> optlen
- sizeof(struct sctp_authkey
)) {
3257 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3258 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3263 ret
= sctp_auth_set_key(sctp_sk(sk
)->ep
, asoc
, authkey
);
3270 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3272 * This option will get or set the active shared key to be used to build
3273 * the association shared key.
3275 static int sctp_setsockopt_active_key(struct sock
*sk
,
3276 char __user
*optval
,
3277 unsigned int optlen
)
3279 struct sctp_authkeyid val
;
3280 struct sctp_association
*asoc
;
3282 if (!sctp_auth_enable
)
3285 if (optlen
!= sizeof(struct sctp_authkeyid
))
3287 if (copy_from_user(&val
, optval
, optlen
))
3290 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3291 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3294 return sctp_auth_set_active_key(sctp_sk(sk
)->ep
, asoc
,
3295 val
.scact_keynumber
);
3299 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3301 * This set option will delete a shared secret key from use.
3303 static int sctp_setsockopt_del_key(struct sock
*sk
,
3304 char __user
*optval
,
3305 unsigned int optlen
)
3307 struct sctp_authkeyid val
;
3308 struct sctp_association
*asoc
;
3310 if (!sctp_auth_enable
)
3313 if (optlen
!= sizeof(struct sctp_authkeyid
))
3315 if (copy_from_user(&val
, optval
, optlen
))
3318 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3319 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3322 return sctp_auth_del_key_id(sctp_sk(sk
)->ep
, asoc
,
3323 val
.scact_keynumber
);
3328 /* API 6.2 setsockopt(), getsockopt()
3330 * Applications use setsockopt() and getsockopt() to set or retrieve
3331 * socket options. Socket options are used to change the default
3332 * behavior of sockets calls. They are described in Section 7.
3336 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3337 * int __user *optlen);
3338 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3341 * sd - the socket descript.
3342 * level - set to IPPROTO_SCTP for all SCTP options.
3343 * optname - the option name.
3344 * optval - the buffer to store the value of the option.
3345 * optlen - the size of the buffer.
3347 SCTP_STATIC
int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3348 char __user
*optval
, unsigned int optlen
)
3352 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3355 /* I can hardly begin to describe how wrong this is. This is
3356 * so broken as to be worse than useless. The API draft
3357 * REALLY is NOT helpful here... I am not convinced that the
3358 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3359 * are at all well-founded.
3361 if (level
!= SOL_SCTP
) {
3362 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3363 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3370 case SCTP_SOCKOPT_BINDX_ADD
:
3371 /* 'optlen' is the size of the addresses buffer. */
3372 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3373 optlen
, SCTP_BINDX_ADD_ADDR
);
3376 case SCTP_SOCKOPT_BINDX_REM
:
3377 /* 'optlen' is the size of the addresses buffer. */
3378 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3379 optlen
, SCTP_BINDX_REM_ADDR
);
3382 case SCTP_SOCKOPT_CONNECTX_OLD
:
3383 /* 'optlen' is the size of the addresses buffer. */
3384 retval
= sctp_setsockopt_connectx_old(sk
,
3385 (struct sockaddr __user
*)optval
,
3389 case SCTP_SOCKOPT_CONNECTX
:
3390 /* 'optlen' is the size of the addresses buffer. */
3391 retval
= sctp_setsockopt_connectx(sk
,
3392 (struct sockaddr __user
*)optval
,
3396 case SCTP_DISABLE_FRAGMENTS
:
3397 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3401 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3404 case SCTP_AUTOCLOSE
:
3405 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3408 case SCTP_PEER_ADDR_PARAMS
:
3409 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3412 case SCTP_DELAYED_ACK
:
3413 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3415 case SCTP_PARTIAL_DELIVERY_POINT
:
3416 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3420 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3422 case SCTP_DEFAULT_SEND_PARAM
:
3423 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3426 case SCTP_PRIMARY_ADDR
:
3427 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3429 case SCTP_SET_PEER_PRIMARY_ADDR
:
3430 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3433 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3436 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3438 case SCTP_ASSOCINFO
:
3439 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3441 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3442 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3445 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3447 case SCTP_ADAPTATION_LAYER
:
3448 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3451 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3453 case SCTP_FRAGMENT_INTERLEAVE
:
3454 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3456 case SCTP_MAX_BURST
:
3457 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3459 case SCTP_AUTH_CHUNK
:
3460 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3462 case SCTP_HMAC_IDENT
:
3463 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3466 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3468 case SCTP_AUTH_ACTIVE_KEY
:
3469 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3471 case SCTP_AUTH_DELETE_KEY
:
3472 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3475 retval
= -ENOPROTOOPT
;
3479 sctp_release_sock(sk
);
3485 /* API 3.1.6 connect() - UDP Style Syntax
3487 * An application may use the connect() call in the UDP model to initiate an
3488 * association without sending data.
3492 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3494 * sd: the socket descriptor to have a new association added to.
3496 * nam: the address structure (either struct sockaddr_in or struct
3497 * sockaddr_in6 defined in RFC2553 [7]).
3499 * len: the size of the address.
3501 SCTP_STATIC
int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3509 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3510 __func__
, sk
, addr
, addr_len
);
3512 /* Validate addr_len before calling common connect/connectx routine. */
3513 af
= sctp_get_af_specific(addr
->sa_family
);
3514 if (!af
|| addr_len
< af
->sockaddr_len
) {
3517 /* Pass correct addr len to common routine (so it knows there
3518 * is only one address being passed.
3520 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
3523 sctp_release_sock(sk
);
3527 /* FIXME: Write comments. */
3528 SCTP_STATIC
int sctp_disconnect(struct sock
*sk
, int flags
)
3530 return -EOPNOTSUPP
; /* STUB */
3533 /* 4.1.4 accept() - TCP Style Syntax
3535 * Applications use accept() call to remove an established SCTP
3536 * association from the accept queue of the endpoint. A new socket
3537 * descriptor will be returned from accept() to represent the newly
3538 * formed association.
3540 SCTP_STATIC
struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3542 struct sctp_sock
*sp
;
3543 struct sctp_endpoint
*ep
;
3544 struct sock
*newsk
= NULL
;
3545 struct sctp_association
*asoc
;
3554 if (!sctp_style(sk
, TCP
)) {
3555 error
= -EOPNOTSUPP
;
3559 if (!sctp_sstate(sk
, LISTENING
)) {
3564 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3566 error
= sctp_wait_for_accept(sk
, timeo
);
3570 /* We treat the list of associations on the endpoint as the accept
3571 * queue and pick the first association on the list.
3573 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3575 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3581 /* Populate the fields of the newsk from the oldsk and migrate the
3582 * asoc to the newsk.
3584 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3587 sctp_release_sock(sk
);
3592 /* The SCTP ioctl handler. */
3593 SCTP_STATIC
int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3595 return -ENOIOCTLCMD
;
3598 /* This is the function which gets called during socket creation to
3599 * initialized the SCTP-specific portion of the sock.
3600 * The sock structure should already be zero-filled memory.
3602 SCTP_STATIC
int sctp_init_sock(struct sock
*sk
)
3604 struct sctp_endpoint
*ep
;
3605 struct sctp_sock
*sp
;
3607 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3611 /* Initialize the SCTP per socket area. */
3612 switch (sk
->sk_type
) {
3613 case SOCK_SEQPACKET
:
3614 sp
->type
= SCTP_SOCKET_UDP
;
3617 sp
->type
= SCTP_SOCKET_TCP
;
3620 return -ESOCKTNOSUPPORT
;
3623 /* Initialize default send parameters. These parameters can be
3624 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3626 sp
->default_stream
= 0;
3627 sp
->default_ppid
= 0;
3628 sp
->default_flags
= 0;
3629 sp
->default_context
= 0;
3630 sp
->default_timetolive
= 0;
3632 sp
->default_rcv_context
= 0;
3633 sp
->max_burst
= sctp_max_burst
;
3635 /* Initialize default setup parameters. These parameters
3636 * can be modified with the SCTP_INITMSG socket option or
3637 * overridden by the SCTP_INIT CMSG.
3639 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3640 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3641 sp
->initmsg
.sinit_max_attempts
= sctp_max_retrans_init
;
3642 sp
->initmsg
.sinit_max_init_timeo
= sctp_rto_max
;
3644 /* Initialize default RTO related parameters. These parameters can
3645 * be modified for with the SCTP_RTOINFO socket option.
3647 sp
->rtoinfo
.srto_initial
= sctp_rto_initial
;
3648 sp
->rtoinfo
.srto_max
= sctp_rto_max
;
3649 sp
->rtoinfo
.srto_min
= sctp_rto_min
;
3651 /* Initialize default association related parameters. These parameters
3652 * can be modified with the SCTP_ASSOCINFO socket option.
3654 sp
->assocparams
.sasoc_asocmaxrxt
= sctp_max_retrans_association
;
3655 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3656 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3657 sp
->assocparams
.sasoc_local_rwnd
= 0;
3658 sp
->assocparams
.sasoc_cookie_life
= sctp_valid_cookie_life
;
3660 /* Initialize default event subscriptions. By default, all the
3663 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3665 /* Default Peer Address Parameters. These defaults can
3666 * be modified via SCTP_PEER_ADDR_PARAMS
3668 sp
->hbinterval
= sctp_hb_interval
;
3669 sp
->pathmaxrxt
= sctp_max_retrans_path
;
3670 sp
->pathmtu
= 0; // allow default discovery
3671 sp
->sackdelay
= sctp_sack_timeout
;
3673 sp
->param_flags
= SPP_HB_ENABLE
|
3675 SPP_SACKDELAY_ENABLE
;
3677 /* If enabled no SCTP message fragmentation will be performed.
3678 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3680 sp
->disable_fragments
= 0;
3682 /* Enable Nagle algorithm by default. */
3685 /* Enable by default. */
3688 /* Auto-close idle associations after the configured
3689 * number of seconds. A value of 0 disables this
3690 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3691 * for UDP-style sockets only.
3695 /* User specified fragmentation limit. */
3698 sp
->adaptation_ind
= 0;
3700 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3702 /* Control variables for partial data delivery. */
3703 atomic_set(&sp
->pd_mode
, 0);
3704 skb_queue_head_init(&sp
->pd_lobby
);
3705 sp
->frag_interleave
= 0;
3707 /* Create a per socket endpoint structure. Even if we
3708 * change the data structure relationships, this may still
3709 * be useful for storing pre-connect address information.
3711 ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3718 SCTP_DBG_OBJCNT_INC(sock
);
3721 percpu_counter_inc(&sctp_sockets_allocated
);
3722 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, 1);
3728 /* Cleanup any SCTP per socket resources. */
3729 SCTP_STATIC
void sctp_destroy_sock(struct sock
*sk
)
3731 struct sctp_endpoint
*ep
;
3733 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3735 /* Release our hold on the endpoint. */
3736 ep
= sctp_sk(sk
)->ep
;
3737 sctp_endpoint_free(ep
);
3739 percpu_counter_dec(&sctp_sockets_allocated
);
3740 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
3744 /* API 4.1.7 shutdown() - TCP Style Syntax
3745 * int shutdown(int socket, int how);
3747 * sd - the socket descriptor of the association to be closed.
3748 * how - Specifies the type of shutdown. The values are
3751 * Disables further receive operations. No SCTP
3752 * protocol action is taken.
3754 * Disables further send operations, and initiates
3755 * the SCTP shutdown sequence.
3757 * Disables further send and receive operations
3758 * and initiates the SCTP shutdown sequence.
3760 SCTP_STATIC
void sctp_shutdown(struct sock
*sk
, int how
)
3762 struct sctp_endpoint
*ep
;
3763 struct sctp_association
*asoc
;
3765 if (!sctp_style(sk
, TCP
))
3768 if (how
& SEND_SHUTDOWN
) {
3769 ep
= sctp_sk(sk
)->ep
;
3770 if (!list_empty(&ep
->asocs
)) {
3771 asoc
= list_entry(ep
->asocs
.next
,
3772 struct sctp_association
, asocs
);
3773 sctp_primitive_SHUTDOWN(asoc
, NULL
);
3778 /* 7.2.1 Association Status (SCTP_STATUS)
3780 * Applications can retrieve current status information about an
3781 * association, including association state, peer receiver window size,
3782 * number of unacked data chunks, and number of data chunks pending
3783 * receipt. This information is read-only.
3785 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
3786 char __user
*optval
,
3789 struct sctp_status status
;
3790 struct sctp_association
*asoc
= NULL
;
3791 struct sctp_transport
*transport
;
3792 sctp_assoc_t associd
;
3795 if (len
< sizeof(status
)) {
3800 len
= sizeof(status
);
3801 if (copy_from_user(&status
, optval
, len
)) {
3806 associd
= status
.sstat_assoc_id
;
3807 asoc
= sctp_id2assoc(sk
, associd
);
3813 transport
= asoc
->peer
.primary_path
;
3815 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
3816 status
.sstat_state
= asoc
->state
;
3817 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
3818 status
.sstat_unackdata
= asoc
->unack_data
;
3820 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
3821 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
3822 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
3823 status
.sstat_fragmentation_point
= asoc
->frag_point
;
3824 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3825 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
3826 transport
->af_specific
->sockaddr_len
);
3827 /* Map ipv4 address into v4-mapped-on-v6 address. */
3828 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
3829 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
3830 status
.sstat_primary
.spinfo_state
= transport
->state
;
3831 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
3832 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
3833 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3834 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
3836 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
3837 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
3839 if (put_user(len
, optlen
)) {
3844 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3845 len
, status
.sstat_state
, status
.sstat_rwnd
,
3846 status
.sstat_assoc_id
);
3848 if (copy_to_user(optval
, &status
, len
)) {
3858 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3860 * Applications can retrieve information about a specific peer address
3861 * of an association, including its reachability state, congestion
3862 * window, and retransmission timer values. This information is
3865 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
3866 char __user
*optval
,
3869 struct sctp_paddrinfo pinfo
;
3870 struct sctp_transport
*transport
;
3873 if (len
< sizeof(pinfo
)) {
3878 len
= sizeof(pinfo
);
3879 if (copy_from_user(&pinfo
, optval
, len
)) {
3884 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
3885 pinfo
.spinfo_assoc_id
);
3889 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
3890 pinfo
.spinfo_state
= transport
->state
;
3891 pinfo
.spinfo_cwnd
= transport
->cwnd
;
3892 pinfo
.spinfo_srtt
= transport
->srtt
;
3893 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
3894 pinfo
.spinfo_mtu
= transport
->pathmtu
;
3896 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
3897 pinfo
.spinfo_state
= SCTP_ACTIVE
;
3899 if (put_user(len
, optlen
)) {
3904 if (copy_to_user(optval
, &pinfo
, len
)) {
3913 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3915 * This option is a on/off flag. If enabled no SCTP message
3916 * fragmentation will be performed. Instead if a message being sent
3917 * exceeds the current PMTU size, the message will NOT be sent and
3918 * instead a error will be indicated to the user.
3920 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
3921 char __user
*optval
, int __user
*optlen
)
3925 if (len
< sizeof(int))
3929 val
= (sctp_sk(sk
)->disable_fragments
== 1);
3930 if (put_user(len
, optlen
))
3932 if (copy_to_user(optval
, &val
, len
))
3937 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3939 * This socket option is used to specify various notifications and
3940 * ancillary data the user wishes to receive.
3942 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
3945 if (len
< sizeof(struct sctp_event_subscribe
))
3947 len
= sizeof(struct sctp_event_subscribe
);
3948 if (put_user(len
, optlen
))
3950 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
3955 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3957 * This socket option is applicable to the UDP-style socket only. When
3958 * set it will cause associations that are idle for more than the
3959 * specified number of seconds to automatically close. An association
3960 * being idle is defined an association that has NOT sent or received
3961 * user data. The special value of '0' indicates that no automatic
3962 * close of any associations should be performed. The option expects an
3963 * integer defining the number of seconds of idle time before an
3964 * association is closed.
3966 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
3968 /* Applicable to UDP-style socket only */
3969 if (sctp_style(sk
, TCP
))
3971 if (len
< sizeof(int))
3974 if (put_user(len
, optlen
))
3976 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
3981 /* Helper routine to branch off an association to a new socket. */
3982 SCTP_STATIC
int sctp_do_peeloff(struct sctp_association
*asoc
,
3983 struct socket
**sockp
)
3985 struct sock
*sk
= asoc
->base
.sk
;
3986 struct socket
*sock
;
3990 /* An association cannot be branched off from an already peeled-off
3991 * socket, nor is this supported for tcp style sockets.
3993 if (!sctp_style(sk
, UDP
))
3996 /* Create a new socket. */
3997 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
4001 sctp_copy_sock(sock
->sk
, sk
, asoc
);
4003 /* Make peeled-off sockets more like 1-1 accepted sockets.
4004 * Set the daddr and initialize id to something more random
4006 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
4007 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
4009 /* Populate the fields of the newsk from the oldsk and migrate the
4010 * asoc to the newsk.
4012 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
4019 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4021 sctp_peeloff_arg_t peeloff
;
4022 struct socket
*newsock
;
4024 struct sctp_association
*asoc
;
4026 if (len
< sizeof(sctp_peeloff_arg_t
))
4028 len
= sizeof(sctp_peeloff_arg_t
);
4029 if (copy_from_user(&peeloff
, optval
, len
))
4032 asoc
= sctp_id2assoc(sk
, peeloff
.associd
);
4038 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__
, sk
, asoc
);
4040 retval
= sctp_do_peeloff(asoc
, &newsock
);
4044 /* Map the socket to an unused fd that can be returned to the user. */
4045 retval
= sock_map_fd(newsock
, 0);
4047 sock_release(newsock
);
4051 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
4052 __func__
, sk
, asoc
, newsock
->sk
, retval
);
4054 /* Return the fd mapped to the new socket. */
4055 peeloff
.sd
= retval
;
4056 if (put_user(len
, optlen
))
4058 if (copy_to_user(optval
, &peeloff
, len
))
4065 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4067 * Applications can enable or disable heartbeats for any peer address of
4068 * an association, modify an address's heartbeat interval, force a
4069 * heartbeat to be sent immediately, and adjust the address's maximum
4070 * number of retransmissions sent before an address is considered
4071 * unreachable. The following structure is used to access and modify an
4072 * address's parameters:
4074 * struct sctp_paddrparams {
4075 * sctp_assoc_t spp_assoc_id;
4076 * struct sockaddr_storage spp_address;
4077 * uint32_t spp_hbinterval;
4078 * uint16_t spp_pathmaxrxt;
4079 * uint32_t spp_pathmtu;
4080 * uint32_t spp_sackdelay;
4081 * uint32_t spp_flags;
4084 * spp_assoc_id - (one-to-many style socket) This is filled in the
4085 * application, and identifies the association for
4087 * spp_address - This specifies which address is of interest.
4088 * spp_hbinterval - This contains the value of the heartbeat interval,
4089 * in milliseconds. If a value of zero
4090 * is present in this field then no changes are to
4091 * be made to this parameter.
4092 * spp_pathmaxrxt - This contains the maximum number of
4093 * retransmissions before this address shall be
4094 * considered unreachable. If a value of zero
4095 * is present in this field then no changes are to
4096 * be made to this parameter.
4097 * spp_pathmtu - When Path MTU discovery is disabled the value
4098 * specified here will be the "fixed" path mtu.
4099 * Note that if the spp_address field is empty
4100 * then all associations on this address will
4101 * have this fixed path mtu set upon them.
4103 * spp_sackdelay - When delayed sack is enabled, this value specifies
4104 * the number of milliseconds that sacks will be delayed
4105 * for. This value will apply to all addresses of an
4106 * association if the spp_address field is empty. Note
4107 * also, that if delayed sack is enabled and this
4108 * value is set to 0, no change is made to the last
4109 * recorded delayed sack timer value.
4111 * spp_flags - These flags are used to control various features
4112 * on an association. The flag field may contain
4113 * zero or more of the following options.
4115 * SPP_HB_ENABLE - Enable heartbeats on the
4116 * specified address. Note that if the address
4117 * field is empty all addresses for the association
4118 * have heartbeats enabled upon them.
4120 * SPP_HB_DISABLE - Disable heartbeats on the
4121 * speicifed address. Note that if the address
4122 * field is empty all addresses for the association
4123 * will have their heartbeats disabled. Note also
4124 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4125 * mutually exclusive, only one of these two should
4126 * be specified. Enabling both fields will have
4127 * undetermined results.
4129 * SPP_HB_DEMAND - Request a user initiated heartbeat
4130 * to be made immediately.
4132 * SPP_PMTUD_ENABLE - This field will enable PMTU
4133 * discovery upon the specified address. Note that
4134 * if the address feild is empty then all addresses
4135 * on the association are effected.
4137 * SPP_PMTUD_DISABLE - This field will disable PMTU
4138 * discovery upon the specified address. Note that
4139 * if the address feild is empty then all addresses
4140 * on the association are effected. Not also that
4141 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4142 * exclusive. Enabling both will have undetermined
4145 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4146 * on delayed sack. The time specified in spp_sackdelay
4147 * is used to specify the sack delay for this address. Note
4148 * that if spp_address is empty then all addresses will
4149 * enable delayed sack and take on the sack delay
4150 * value specified in spp_sackdelay.
4151 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4152 * off delayed sack. If the spp_address field is blank then
4153 * delayed sack is disabled for the entire association. Note
4154 * also that this field is mutually exclusive to
4155 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4158 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
4159 char __user
*optval
, int __user
*optlen
)
4161 struct sctp_paddrparams params
;
4162 struct sctp_transport
*trans
= NULL
;
4163 struct sctp_association
*asoc
= NULL
;
4164 struct sctp_sock
*sp
= sctp_sk(sk
);
4166 if (len
< sizeof(struct sctp_paddrparams
))
4168 len
= sizeof(struct sctp_paddrparams
);
4169 if (copy_from_user(¶ms
, optval
, len
))
4172 /* If an address other than INADDR_ANY is specified, and
4173 * no transport is found, then the request is invalid.
4175 if (!sctp_is_any(sk
, ( union sctp_addr
*)¶ms
.spp_address
)) {
4176 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
4177 params
.spp_assoc_id
);
4179 SCTP_DEBUG_PRINTK("Failed no transport\n");
4184 /* Get association, if assoc_id != 0 and the socket is a one
4185 * to many style socket, and an association was not found, then
4186 * the id was invalid.
4188 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
4189 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
4190 SCTP_DEBUG_PRINTK("Failed no association\n");
4195 /* Fetch transport values. */
4196 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
4197 params
.spp_pathmtu
= trans
->pathmtu
;
4198 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
4199 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
4201 /*draft-11 doesn't say what to return in spp_flags*/
4202 params
.spp_flags
= trans
->param_flags
;
4204 /* Fetch association values. */
4205 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
4206 params
.spp_pathmtu
= asoc
->pathmtu
;
4207 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
4208 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
4210 /*draft-11 doesn't say what to return in spp_flags*/
4211 params
.spp_flags
= asoc
->param_flags
;
4213 /* Fetch socket values. */
4214 params
.spp_hbinterval
= sp
->hbinterval
;
4215 params
.spp_pathmtu
= sp
->pathmtu
;
4216 params
.spp_sackdelay
= sp
->sackdelay
;
4217 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
4219 /*draft-11 doesn't say what to return in spp_flags*/
4220 params
.spp_flags
= sp
->param_flags
;
4223 if (copy_to_user(optval
, ¶ms
, len
))
4226 if (put_user(len
, optlen
))
4233 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4235 * This option will effect the way delayed acks are performed. This
4236 * option allows you to get or set the delayed ack time, in
4237 * milliseconds. It also allows changing the delayed ack frequency.
4238 * Changing the frequency to 1 disables the delayed sack algorithm. If
4239 * the assoc_id is 0, then this sets or gets the endpoints default
4240 * values. If the assoc_id field is non-zero, then the set or get
4241 * effects the specified association for the one to many model (the
4242 * assoc_id field is ignored by the one to one model). Note that if
4243 * sack_delay or sack_freq are 0 when setting this option, then the
4244 * current values will remain unchanged.
4246 * struct sctp_sack_info {
4247 * sctp_assoc_t sack_assoc_id;
4248 * uint32_t sack_delay;
4249 * uint32_t sack_freq;
4252 * sack_assoc_id - This parameter, indicates which association the user
4253 * is performing an action upon. Note that if this field's value is
4254 * zero then the endpoints default value is changed (effecting future
4255 * associations only).
4257 * sack_delay - This parameter contains the number of milliseconds that
4258 * the user is requesting the delayed ACK timer be set to. Note that
4259 * this value is defined in the standard to be between 200 and 500
4262 * sack_freq - This parameter contains the number of packets that must
4263 * be received before a sack is sent without waiting for the delay
4264 * timer to expire. The default value for this is 2, setting this
4265 * value to 1 will disable the delayed sack algorithm.
4267 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
4268 char __user
*optval
,
4271 struct sctp_sack_info params
;
4272 struct sctp_association
*asoc
= NULL
;
4273 struct sctp_sock
*sp
= sctp_sk(sk
);
4275 if (len
>= sizeof(struct sctp_sack_info
)) {
4276 len
= sizeof(struct sctp_sack_info
);
4278 if (copy_from_user(¶ms
, optval
, len
))
4280 } else if (len
== sizeof(struct sctp_assoc_value
)) {
4281 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4282 pr_warn("Use struct sctp_sack_info instead\n");
4283 if (copy_from_user(¶ms
, optval
, len
))
4288 /* Get association, if sack_assoc_id != 0 and the socket is a one
4289 * to many style socket, and an association was not found, then
4290 * the id was invalid.
4292 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
4293 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
4297 /* Fetch association values. */
4298 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4299 params
.sack_delay
= jiffies_to_msecs(
4301 params
.sack_freq
= asoc
->sackfreq
;
4304 params
.sack_delay
= 0;
4305 params
.sack_freq
= 1;
4308 /* Fetch socket values. */
4309 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4310 params
.sack_delay
= sp
->sackdelay
;
4311 params
.sack_freq
= sp
->sackfreq
;
4313 params
.sack_delay
= 0;
4314 params
.sack_freq
= 1;
4318 if (copy_to_user(optval
, ¶ms
, len
))
4321 if (put_user(len
, optlen
))
4327 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4329 * Applications can specify protocol parameters for the default association
4330 * initialization. The option name argument to setsockopt() and getsockopt()
4333 * Setting initialization parameters is effective only on an unconnected
4334 * socket (for UDP-style sockets only future associations are effected
4335 * by the change). With TCP-style sockets, this option is inherited by
4336 * sockets derived from a listener socket.
4338 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4340 if (len
< sizeof(struct sctp_initmsg
))
4342 len
= sizeof(struct sctp_initmsg
);
4343 if (put_user(len
, optlen
))
4345 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
4351 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4352 char __user
*optval
, int __user
*optlen
)
4354 struct sctp_association
*asoc
;
4356 struct sctp_getaddrs getaddrs
;
4357 struct sctp_transport
*from
;
4359 union sctp_addr temp
;
4360 struct sctp_sock
*sp
= sctp_sk(sk
);
4365 if (len
< sizeof(struct sctp_getaddrs
))
4368 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4371 /* For UDP-style sockets, id specifies the association to query. */
4372 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4376 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4377 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4379 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
4381 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4382 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4383 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4384 if (space_left
< addrlen
)
4386 if (copy_to_user(to
, &temp
, addrlen
))
4390 space_left
-= addrlen
;
4393 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4395 bytes_copied
= ((char __user
*)to
) - optval
;
4396 if (put_user(bytes_copied
, optlen
))
4402 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4403 size_t space_left
, int *bytes_copied
)
4405 struct sctp_sockaddr_entry
*addr
;
4406 union sctp_addr temp
;
4411 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
4415 if ((PF_INET
== sk
->sk_family
) &&
4416 (AF_INET6
== addr
->a
.sa
.sa_family
))
4418 if ((PF_INET6
== sk
->sk_family
) &&
4419 inet_v6_ipv6only(sk
) &&
4420 (AF_INET
== addr
->a
.sa
.sa_family
))
4422 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4423 if (!temp
.v4
.sin_port
)
4424 temp
.v4
.sin_port
= htons(port
);
4426 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4428 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4429 if (space_left
< addrlen
) {
4433 memcpy(to
, &temp
, addrlen
);
4437 space_left
-= addrlen
;
4438 *bytes_copied
+= addrlen
;
4446 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4447 char __user
*optval
, int __user
*optlen
)
4449 struct sctp_bind_addr
*bp
;
4450 struct sctp_association
*asoc
;
4452 struct sctp_getaddrs getaddrs
;
4453 struct sctp_sockaddr_entry
*addr
;
4455 union sctp_addr temp
;
4456 struct sctp_sock
*sp
= sctp_sk(sk
);
4460 int bytes_copied
= 0;
4464 if (len
< sizeof(struct sctp_getaddrs
))
4467 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4471 * For UDP-style sockets, id specifies the association to query.
4472 * If the id field is set to the value '0' then the locally bound
4473 * addresses are returned without regard to any particular
4476 if (0 == getaddrs
.assoc_id
) {
4477 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4479 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4482 bp
= &asoc
->base
.bind_addr
;
4485 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4486 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4488 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4492 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4493 * addresses from the global local address list.
4495 if (sctp_list_single_entry(&bp
->address_list
)) {
4496 addr
= list_entry(bp
->address_list
.next
,
4497 struct sctp_sockaddr_entry
, list
);
4498 if (sctp_is_any(sk
, &addr
->a
)) {
4499 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4500 space_left
, &bytes_copied
);
4510 /* Protection on the bound address list is not needed since
4511 * in the socket option context we hold a socket lock and
4512 * thus the bound address list can't change.
4514 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4515 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4516 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4517 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4518 if (space_left
< addrlen
) {
4519 err
= -ENOMEM
; /*fixme: right error?*/
4522 memcpy(buf
, &temp
, addrlen
);
4524 bytes_copied
+= addrlen
;
4526 space_left
-= addrlen
;
4530 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4534 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4538 if (put_user(bytes_copied
, optlen
))
4545 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4547 * Requests that the local SCTP stack use the enclosed peer address as
4548 * the association primary. The enclosed address must be one of the
4549 * association peer's addresses.
4551 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4552 char __user
*optval
, int __user
*optlen
)
4554 struct sctp_prim prim
;
4555 struct sctp_association
*asoc
;
4556 struct sctp_sock
*sp
= sctp_sk(sk
);
4558 if (len
< sizeof(struct sctp_prim
))
4561 len
= sizeof(struct sctp_prim
);
4563 if (copy_from_user(&prim
, optval
, len
))
4566 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4570 if (!asoc
->peer
.primary_path
)
4573 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4574 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4576 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4577 (union sctp_addr
*)&prim
.ssp_addr
);
4579 if (put_user(len
, optlen
))
4581 if (copy_to_user(optval
, &prim
, len
))
4588 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4590 * Requests that the local endpoint set the specified Adaptation Layer
4591 * Indication parameter for all future INIT and INIT-ACK exchanges.
4593 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4594 char __user
*optval
, int __user
*optlen
)
4596 struct sctp_setadaptation adaptation
;
4598 if (len
< sizeof(struct sctp_setadaptation
))
4601 len
= sizeof(struct sctp_setadaptation
);
4603 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4605 if (put_user(len
, optlen
))
4607 if (copy_to_user(optval
, &adaptation
, len
))
4615 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4617 * Applications that wish to use the sendto() system call may wish to
4618 * specify a default set of parameters that would normally be supplied
4619 * through the inclusion of ancillary data. This socket option allows
4620 * such an application to set the default sctp_sndrcvinfo structure.
4623 * The application that wishes to use this socket option simply passes
4624 * in to this call the sctp_sndrcvinfo structure defined in Section
4625 * 5.2.2) The input parameters accepted by this call include
4626 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4627 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4628 * to this call if the caller is using the UDP model.
4630 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4632 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4633 int len
, char __user
*optval
,
4636 struct sctp_sndrcvinfo info
;
4637 struct sctp_association
*asoc
;
4638 struct sctp_sock
*sp
= sctp_sk(sk
);
4640 if (len
< sizeof(struct sctp_sndrcvinfo
))
4643 len
= sizeof(struct sctp_sndrcvinfo
);
4645 if (copy_from_user(&info
, optval
, len
))
4648 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4649 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4653 info
.sinfo_stream
= asoc
->default_stream
;
4654 info
.sinfo_flags
= asoc
->default_flags
;
4655 info
.sinfo_ppid
= asoc
->default_ppid
;
4656 info
.sinfo_context
= asoc
->default_context
;
4657 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4659 info
.sinfo_stream
= sp
->default_stream
;
4660 info
.sinfo_flags
= sp
->default_flags
;
4661 info
.sinfo_ppid
= sp
->default_ppid
;
4662 info
.sinfo_context
= sp
->default_context
;
4663 info
.sinfo_timetolive
= sp
->default_timetolive
;
4666 if (put_user(len
, optlen
))
4668 if (copy_to_user(optval
, &info
, len
))
4676 * 7.1.5 SCTP_NODELAY
4678 * Turn on/off any Nagle-like algorithm. This means that packets are
4679 * generally sent as soon as possible and no unnecessary delays are
4680 * introduced, at the cost of more packets in the network. Expects an
4681 * integer boolean flag.
4684 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4685 char __user
*optval
, int __user
*optlen
)
4689 if (len
< sizeof(int))
4693 val
= (sctp_sk(sk
)->nodelay
== 1);
4694 if (put_user(len
, optlen
))
4696 if (copy_to_user(optval
, &val
, len
))
4703 * 7.1.1 SCTP_RTOINFO
4705 * The protocol parameters used to initialize and bound retransmission
4706 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4707 * and modify these parameters.
4708 * All parameters are time values, in milliseconds. A value of 0, when
4709 * modifying the parameters, indicates that the current value should not
4713 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4714 char __user
*optval
,
4715 int __user
*optlen
) {
4716 struct sctp_rtoinfo rtoinfo
;
4717 struct sctp_association
*asoc
;
4719 if (len
< sizeof (struct sctp_rtoinfo
))
4722 len
= sizeof(struct sctp_rtoinfo
);
4724 if (copy_from_user(&rtoinfo
, optval
, len
))
4727 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
4729 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
4732 /* Values corresponding to the specific association. */
4734 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
4735 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
4736 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
4738 /* Values corresponding to the endpoint. */
4739 struct sctp_sock
*sp
= sctp_sk(sk
);
4741 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
4742 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
4743 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
4746 if (put_user(len
, optlen
))
4749 if (copy_to_user(optval
, &rtoinfo
, len
))
4757 * 7.1.2 SCTP_ASSOCINFO
4759 * This option is used to tune the maximum retransmission attempts
4760 * of the association.
4761 * Returns an error if the new association retransmission value is
4762 * greater than the sum of the retransmission value of the peer.
4763 * See [SCTP] for more information.
4766 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
4767 char __user
*optval
,
4771 struct sctp_assocparams assocparams
;
4772 struct sctp_association
*asoc
;
4773 struct list_head
*pos
;
4776 if (len
< sizeof (struct sctp_assocparams
))
4779 len
= sizeof(struct sctp_assocparams
);
4781 if (copy_from_user(&assocparams
, optval
, len
))
4784 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
4786 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
4789 /* Values correspoinding to the specific association */
4791 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
4792 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
4793 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
4794 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
4796 (asoc
->cookie_life
.tv_usec
4799 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
4803 assocparams
.sasoc_number_peer_destinations
= cnt
;
4805 /* Values corresponding to the endpoint */
4806 struct sctp_sock
*sp
= sctp_sk(sk
);
4808 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
4809 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
4810 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
4811 assocparams
.sasoc_cookie_life
=
4812 sp
->assocparams
.sasoc_cookie_life
;
4813 assocparams
.sasoc_number_peer_destinations
=
4815 sasoc_number_peer_destinations
;
4818 if (put_user(len
, optlen
))
4821 if (copy_to_user(optval
, &assocparams
, len
))
4828 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4830 * This socket option is a boolean flag which turns on or off mapped V4
4831 * addresses. If this option is turned on and the socket is type
4832 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4833 * If this option is turned off, then no mapping will be done of V4
4834 * addresses and a user will receive both PF_INET6 and PF_INET type
4835 * addresses on the socket.
4837 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
4838 char __user
*optval
, int __user
*optlen
)
4841 struct sctp_sock
*sp
= sctp_sk(sk
);
4843 if (len
< sizeof(int))
4848 if (put_user(len
, optlen
))
4850 if (copy_to_user(optval
, &val
, len
))
4857 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
4858 * (chapter and verse is quoted at sctp_setsockopt_context())
4860 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
4861 char __user
*optval
, int __user
*optlen
)
4863 struct sctp_assoc_value params
;
4864 struct sctp_sock
*sp
;
4865 struct sctp_association
*asoc
;
4867 if (len
< sizeof(struct sctp_assoc_value
))
4870 len
= sizeof(struct sctp_assoc_value
);
4872 if (copy_from_user(¶ms
, optval
, len
))
4877 if (params
.assoc_id
!= 0) {
4878 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4881 params
.assoc_value
= asoc
->default_rcv_context
;
4883 params
.assoc_value
= sp
->default_rcv_context
;
4886 if (put_user(len
, optlen
))
4888 if (copy_to_user(optval
, ¶ms
, len
))
4895 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
4896 * This option will get or set the maximum size to put in any outgoing
4897 * SCTP DATA chunk. If a message is larger than this size it will be
4898 * fragmented by SCTP into the specified size. Note that the underlying
4899 * SCTP implementation may fragment into smaller sized chunks when the
4900 * PMTU of the underlying association is smaller than the value set by
4901 * the user. The default value for this option is '0' which indicates
4902 * the user is NOT limiting fragmentation and only the PMTU will effect
4903 * SCTP's choice of DATA chunk size. Note also that values set larger
4904 * than the maximum size of an IP datagram will effectively let SCTP
4905 * control fragmentation (i.e. the same as setting this option to 0).
4907 * The following structure is used to access and modify this parameter:
4909 * struct sctp_assoc_value {
4910 * sctp_assoc_t assoc_id;
4911 * uint32_t assoc_value;
4914 * assoc_id: This parameter is ignored for one-to-one style sockets.
4915 * For one-to-many style sockets this parameter indicates which
4916 * association the user is performing an action upon. Note that if
4917 * this field's value is zero then the endpoints default value is
4918 * changed (effecting future associations only).
4919 * assoc_value: This parameter specifies the maximum size in bytes.
4921 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
4922 char __user
*optval
, int __user
*optlen
)
4924 struct sctp_assoc_value params
;
4925 struct sctp_association
*asoc
;
4927 if (len
== sizeof(int)) {
4928 pr_warn("Use of int in maxseg socket option deprecated\n");
4929 pr_warn("Use struct sctp_assoc_value instead\n");
4930 params
.assoc_id
= 0;
4931 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
4932 len
= sizeof(struct sctp_assoc_value
);
4933 if (copy_from_user(¶ms
, optval
, sizeof(params
)))
4938 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4939 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
4943 params
.assoc_value
= asoc
->frag_point
;
4945 params
.assoc_value
= sctp_sk(sk
)->user_frag
;
4947 if (put_user(len
, optlen
))
4949 if (len
== sizeof(int)) {
4950 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
4953 if (copy_to_user(optval
, ¶ms
, len
))
4961 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
4962 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
4964 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
4965 char __user
*optval
, int __user
*optlen
)
4969 if (len
< sizeof(int))
4974 val
= sctp_sk(sk
)->frag_interleave
;
4975 if (put_user(len
, optlen
))
4977 if (copy_to_user(optval
, &val
, len
))
4984 * 7.1.25. Set or Get the sctp partial delivery point
4985 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
4987 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
4988 char __user
*optval
,
4993 if (len
< sizeof(u32
))
4998 val
= sctp_sk(sk
)->pd_point
;
4999 if (put_user(len
, optlen
))
5001 if (copy_to_user(optval
, &val
, len
))
5008 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5009 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5011 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5012 char __user
*optval
,
5015 struct sctp_assoc_value params
;
5016 struct sctp_sock
*sp
;
5017 struct sctp_association
*asoc
;
5019 if (len
== sizeof(int)) {
5020 pr_warn("Use of int in max_burst socket option deprecated\n");
5021 pr_warn("Use struct sctp_assoc_value instead\n");
5022 params
.assoc_id
= 0;
5023 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5024 len
= sizeof(struct sctp_assoc_value
);
5025 if (copy_from_user(¶ms
, optval
, len
))
5032 if (params
.assoc_id
!= 0) {
5033 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5036 params
.assoc_value
= asoc
->max_burst
;
5038 params
.assoc_value
= sp
->max_burst
;
5040 if (len
== sizeof(int)) {
5041 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5044 if (copy_to_user(optval
, ¶ms
, len
))
5052 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5053 char __user
*optval
, int __user
*optlen
)
5055 struct sctp_hmacalgo __user
*p
= (void __user
*)optval
;
5056 struct sctp_hmac_algo_param
*hmacs
;
5060 if (!sctp_auth_enable
)
5063 hmacs
= sctp_sk(sk
)->ep
->auth_hmacs_list
;
5064 data_len
= ntohs(hmacs
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5066 if (len
< sizeof(struct sctp_hmacalgo
) + data_len
)
5069 len
= sizeof(struct sctp_hmacalgo
) + data_len
;
5070 num_idents
= data_len
/ sizeof(u16
);
5072 if (put_user(len
, optlen
))
5074 if (put_user(num_idents
, &p
->shmac_num_idents
))
5076 if (copy_to_user(p
->shmac_idents
, hmacs
->hmac_ids
, data_len
))
5081 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5082 char __user
*optval
, int __user
*optlen
)
5084 struct sctp_authkeyid val
;
5085 struct sctp_association
*asoc
;
5087 if (!sctp_auth_enable
)
5090 if (len
< sizeof(struct sctp_authkeyid
))
5092 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5095 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5096 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5100 val
.scact_keynumber
= asoc
->active_key_id
;
5102 val
.scact_keynumber
= sctp_sk(sk
)->ep
->active_key_id
;
5104 len
= sizeof(struct sctp_authkeyid
);
5105 if (put_user(len
, optlen
))
5107 if (copy_to_user(optval
, &val
, len
))
5113 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5114 char __user
*optval
, int __user
*optlen
)
5116 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5117 struct sctp_authchunks val
;
5118 struct sctp_association
*asoc
;
5119 struct sctp_chunks_param
*ch
;
5123 if (!sctp_auth_enable
)
5126 if (len
< sizeof(struct sctp_authchunks
))
5129 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
5132 to
= p
->gauth_chunks
;
5133 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5137 ch
= asoc
->peer
.peer_chunks
;
5141 /* See if the user provided enough room for all the data */
5142 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5143 if (len
< num_chunks
)
5146 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
5149 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
5150 if (put_user(len
, optlen
)) return -EFAULT
;
5151 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5156 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
5157 char __user
*optval
, int __user
*optlen
)
5159 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5160 struct sctp_authchunks val
;
5161 struct sctp_association
*asoc
;
5162 struct sctp_chunks_param
*ch
;
5166 if (!sctp_auth_enable
)
5169 if (len
< sizeof(struct sctp_authchunks
))
5172 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
5175 to
= p
->gauth_chunks
;
5176 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5177 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
5181 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
5183 ch
= sctp_sk(sk
)->ep
->auth_chunk_list
;
5188 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5189 if (len
< sizeof(struct sctp_authchunks
) + num_chunks
)
5192 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
5195 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
5196 if (put_user(len
, optlen
))
5198 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5205 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5206 * This option gets the current number of associations that are attached
5207 * to a one-to-many style socket. The option value is an uint32_t.
5209 static int sctp_getsockopt_assoc_number(struct sock
*sk
, int len
,
5210 char __user
*optval
, int __user
*optlen
)
5212 struct sctp_sock
*sp
= sctp_sk(sk
);
5213 struct sctp_association
*asoc
;
5216 if (sctp_style(sk
, TCP
))
5219 if (len
< sizeof(u32
))
5224 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5228 if (put_user(len
, optlen
))
5230 if (copy_to_user(optval
, &val
, len
))
5236 SCTP_STATIC
int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
5237 char __user
*optval
, int __user
*optlen
)
5242 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5245 /* I can hardly begin to describe how wrong this is. This is
5246 * so broken as to be worse than useless. The API draft
5247 * REALLY is NOT helpful here... I am not convinced that the
5248 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5249 * are at all well-founded.
5251 if (level
!= SOL_SCTP
) {
5252 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5254 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
5258 if (get_user(len
, optlen
))
5265 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
5267 case SCTP_DISABLE_FRAGMENTS
:
5268 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
5272 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
5274 case SCTP_AUTOCLOSE
:
5275 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
5277 case SCTP_SOCKOPT_PEELOFF
:
5278 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
5280 case SCTP_PEER_ADDR_PARAMS
:
5281 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
5284 case SCTP_DELAYED_ACK
:
5285 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
5289 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
5291 case SCTP_GET_PEER_ADDRS
:
5292 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
5295 case SCTP_GET_LOCAL_ADDRS
:
5296 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
5299 case SCTP_SOCKOPT_CONNECTX3
:
5300 retval
= sctp_getsockopt_connectx3(sk
, len
, optval
, optlen
);
5302 case SCTP_DEFAULT_SEND_PARAM
:
5303 retval
= sctp_getsockopt_default_send_param(sk
, len
,
5306 case SCTP_PRIMARY_ADDR
:
5307 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
5310 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
5313 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
5315 case SCTP_ASSOCINFO
:
5316 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
5318 case SCTP_I_WANT_MAPPED_V4_ADDR
:
5319 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
5322 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
5324 case SCTP_GET_PEER_ADDR_INFO
:
5325 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
5328 case SCTP_ADAPTATION_LAYER
:
5329 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
5333 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
5335 case SCTP_FRAGMENT_INTERLEAVE
:
5336 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
5339 case SCTP_PARTIAL_DELIVERY_POINT
:
5340 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
5343 case SCTP_MAX_BURST
:
5344 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
5347 case SCTP_AUTH_CHUNK
:
5348 case SCTP_AUTH_DELETE_KEY
:
5349 retval
= -EOPNOTSUPP
;
5351 case SCTP_HMAC_IDENT
:
5352 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
5354 case SCTP_AUTH_ACTIVE_KEY
:
5355 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
5357 case SCTP_PEER_AUTH_CHUNKS
:
5358 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
5361 case SCTP_LOCAL_AUTH_CHUNKS
:
5362 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
5365 case SCTP_GET_ASSOC_NUMBER
:
5366 retval
= sctp_getsockopt_assoc_number(sk
, len
, optval
, optlen
);
5369 retval
= -ENOPROTOOPT
;
5373 sctp_release_sock(sk
);
5377 static void sctp_hash(struct sock
*sk
)
5382 static void sctp_unhash(struct sock
*sk
)
5387 /* Check if port is acceptable. Possibly find first available port.
5389 * The port hash table (contained in the 'global' SCTP protocol storage
5390 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5391 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5392 * list (the list number is the port number hashed out, so as you
5393 * would expect from a hash function, all the ports in a given list have
5394 * such a number that hashes out to the same list number; you were
5395 * expecting that, right?); so each list has a set of ports, with a
5396 * link to the socket (struct sock) that uses it, the port number and
5397 * a fastreuse flag (FIXME: NPI ipg).
5399 static struct sctp_bind_bucket
*sctp_bucket_create(
5400 struct sctp_bind_hashbucket
*head
, unsigned short snum
);
5402 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
5404 struct sctp_bind_hashbucket
*head
; /* hash list */
5405 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
5406 struct hlist_node
*node
;
5407 unsigned short snum
;
5410 snum
= ntohs(addr
->v4
.sin_port
);
5412 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
5413 sctp_local_bh_disable();
5416 /* Search for an available port. */
5417 int low
, high
, remaining
, index
;
5420 inet_get_local_port_range(&low
, &high
);
5421 remaining
= (high
- low
) + 1;
5422 rover
= net_random() % remaining
+ low
;
5426 if ((rover
< low
) || (rover
> high
))
5428 if (inet_is_reserved_local_port(rover
))
5430 index
= sctp_phashfn(rover
);
5431 head
= &sctp_port_hashtable
[index
];
5432 sctp_spin_lock(&head
->lock
);
5433 sctp_for_each_hentry(pp
, node
, &head
->chain
)
5434 if (pp
->port
== rover
)
5438 sctp_spin_unlock(&head
->lock
);
5439 } while (--remaining
> 0);
5441 /* Exhausted local port range during search? */
5446 /* OK, here is the one we will use. HEAD (the port
5447 * hash table list entry) is non-NULL and we hold it's
5452 /* We are given an specific port number; we verify
5453 * that it is not being used. If it is used, we will
5454 * exahust the search in the hash list corresponding
5455 * to the port number (snum) - we detect that with the
5456 * port iterator, pp being NULL.
5458 head
= &sctp_port_hashtable
[sctp_phashfn(snum
)];
5459 sctp_spin_lock(&head
->lock
);
5460 sctp_for_each_hentry(pp
, node
, &head
->chain
) {
5461 if (pp
->port
== snum
)
5468 if (!hlist_empty(&pp
->owner
)) {
5469 /* We had a port hash table hit - there is an
5470 * available port (pp != NULL) and it is being
5471 * used by other socket (pp->owner not empty); that other
5472 * socket is going to be sk2.
5474 int reuse
= sk
->sk_reuse
;
5477 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5478 if (pp
->fastreuse
&& sk
->sk_reuse
&&
5479 sk
->sk_state
!= SCTP_SS_LISTENING
)
5482 /* Run through the list of sockets bound to the port
5483 * (pp->port) [via the pointers bind_next and
5484 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5485 * we get the endpoint they describe and run through
5486 * the endpoint's list of IP (v4 or v6) addresses,
5487 * comparing each of the addresses with the address of
5488 * the socket sk. If we find a match, then that means
5489 * that this port/socket (sk) combination are already
5492 sk_for_each_bound(sk2
, node
, &pp
->owner
) {
5493 struct sctp_endpoint
*ep2
;
5494 ep2
= sctp_sk(sk2
)->ep
;
5497 (reuse
&& sk2
->sk_reuse
&&
5498 sk2
->sk_state
!= SCTP_SS_LISTENING
))
5501 if (sctp_bind_addr_conflict(&ep2
->base
.bind_addr
, addr
,
5502 sctp_sk(sk2
), sctp_sk(sk
))) {
5507 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5510 /* If there was a hash table miss, create a new port. */
5512 if (!pp
&& !(pp
= sctp_bucket_create(head
, snum
)))
5515 /* In either case (hit or miss), make sure fastreuse is 1 only
5516 * if sk->sk_reuse is too (that is, if the caller requested
5517 * SO_REUSEADDR on this socket -sk-).
5519 if (hlist_empty(&pp
->owner
)) {
5520 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
5524 } else if (pp
->fastreuse
&&
5525 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
5528 /* We are set, so fill up all the data in the hash table
5529 * entry, tie the socket list information with the rest of the
5530 * sockets FIXME: Blurry, NPI (ipg).
5533 if (!sctp_sk(sk
)->bind_hash
) {
5534 inet_sk(sk
)->inet_num
= snum
;
5535 sk_add_bind_node(sk
, &pp
->owner
);
5536 sctp_sk(sk
)->bind_hash
= pp
;
5541 sctp_spin_unlock(&head
->lock
);
5544 sctp_local_bh_enable();
5548 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5549 * port is requested.
5551 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
5554 union sctp_addr addr
;
5555 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5557 /* Set up a dummy address struct from the sk. */
5558 af
->from_sk(&addr
, sk
);
5559 addr
.v4
.sin_port
= htons(snum
);
5561 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5562 ret
= sctp_get_port_local(sk
, &addr
);
5564 return (ret
? 1 : 0);
5568 * Move a socket to LISTENING state.
5570 SCTP_STATIC
int sctp_listen_start(struct sock
*sk
, int backlog
)
5572 struct sctp_sock
*sp
= sctp_sk(sk
);
5573 struct sctp_endpoint
*ep
= sp
->ep
;
5574 struct crypto_hash
*tfm
= NULL
;
5576 /* Allocate HMAC for generating cookie. */
5577 if (!sctp_sk(sk
)->hmac
&& sctp_hmac_alg
) {
5578 tfm
= crypto_alloc_hash(sctp_hmac_alg
, 0, CRYPTO_ALG_ASYNC
);
5580 if (net_ratelimit()) {
5581 pr_info("failed to load transform for %s: %ld\n",
5582 sctp_hmac_alg
, PTR_ERR(tfm
));
5586 sctp_sk(sk
)->hmac
= tfm
;
5590 * If a bind() or sctp_bindx() is not called prior to a listen()
5591 * call that allows new associations to be accepted, the system
5592 * picks an ephemeral port and will choose an address set equivalent
5593 * to binding with a wildcard address.
5595 * This is not currently spelled out in the SCTP sockets
5596 * extensions draft, but follows the practice as seen in TCP
5600 sk
->sk_state
= SCTP_SS_LISTENING
;
5601 if (!ep
->base
.bind_addr
.port
) {
5602 if (sctp_autobind(sk
))
5605 if (sctp_get_port(sk
, inet_sk(sk
)->inet_num
)) {
5606 sk
->sk_state
= SCTP_SS_CLOSED
;
5611 sk
->sk_max_ack_backlog
= backlog
;
5612 sctp_hash_endpoint(ep
);
5617 * 4.1.3 / 5.1.3 listen()
5619 * By default, new associations are not accepted for UDP style sockets.
5620 * An application uses listen() to mark a socket as being able to
5621 * accept new associations.
5623 * On TCP style sockets, applications use listen() to ready the SCTP
5624 * endpoint for accepting inbound associations.
5626 * On both types of endpoints a backlog of '0' disables listening.
5628 * Move a socket to LISTENING state.
5630 int sctp_inet_listen(struct socket
*sock
, int backlog
)
5632 struct sock
*sk
= sock
->sk
;
5633 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
5636 if (unlikely(backlog
< 0))
5641 /* Peeled-off sockets are not allowed to listen(). */
5642 if (sctp_style(sk
, UDP_HIGH_BANDWIDTH
))
5645 if (sock
->state
!= SS_UNCONNECTED
)
5648 /* If backlog is zero, disable listening. */
5650 if (sctp_sstate(sk
, CLOSED
))
5654 sctp_unhash_endpoint(ep
);
5655 sk
->sk_state
= SCTP_SS_CLOSED
;
5657 sctp_sk(sk
)->bind_hash
->fastreuse
= 1;
5661 /* If we are already listening, just update the backlog */
5662 if (sctp_sstate(sk
, LISTENING
))
5663 sk
->sk_max_ack_backlog
= backlog
;
5665 err
= sctp_listen_start(sk
, backlog
);
5672 sctp_release_sock(sk
);
5677 * This function is done by modeling the current datagram_poll() and the
5678 * tcp_poll(). Note that, based on these implementations, we don't
5679 * lock the socket in this function, even though it seems that,
5680 * ideally, locking or some other mechanisms can be used to ensure
5681 * the integrity of the counters (sndbuf and wmem_alloc) used
5682 * in this place. We assume that we don't need locks either until proven
5685 * Another thing to note is that we include the Async I/O support
5686 * here, again, by modeling the current TCP/UDP code. We don't have
5687 * a good way to test with it yet.
5689 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
5691 struct sock
*sk
= sock
->sk
;
5692 struct sctp_sock
*sp
= sctp_sk(sk
);
5695 poll_wait(file
, sk_sleep(sk
), wait
);
5697 /* A TCP-style listening socket becomes readable when the accept queue
5700 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
5701 return (!list_empty(&sp
->ep
->asocs
)) ?
5702 (POLLIN
| POLLRDNORM
) : 0;
5706 /* Is there any exceptional events? */
5707 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
5709 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5710 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
5711 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
5714 /* Is it readable? Reconsider this code with TCP-style support. */
5715 if (!skb_queue_empty(&sk
->sk_receive_queue
))
5716 mask
|= POLLIN
| POLLRDNORM
;
5718 /* The association is either gone or not ready. */
5719 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
5722 /* Is it writable? */
5723 if (sctp_writeable(sk
)) {
5724 mask
|= POLLOUT
| POLLWRNORM
;
5726 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
5728 * Since the socket is not locked, the buffer
5729 * might be made available after the writeable check and
5730 * before the bit is set. This could cause a lost I/O
5731 * signal. tcp_poll() has a race breaker for this race
5732 * condition. Based on their implementation, we put
5733 * in the following code to cover it as well.
5735 if (sctp_writeable(sk
))
5736 mask
|= POLLOUT
| POLLWRNORM
;
5741 /********************************************************************
5742 * 2nd Level Abstractions
5743 ********************************************************************/
5745 static struct sctp_bind_bucket
*sctp_bucket_create(
5746 struct sctp_bind_hashbucket
*head
, unsigned short snum
)
5748 struct sctp_bind_bucket
*pp
;
5750 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
5752 SCTP_DBG_OBJCNT_INC(bind_bucket
);
5755 INIT_HLIST_HEAD(&pp
->owner
);
5756 hlist_add_head(&pp
->node
, &head
->chain
);
5761 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5762 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
5764 if (pp
&& hlist_empty(&pp
->owner
)) {
5765 __hlist_del(&pp
->node
);
5766 kmem_cache_free(sctp_bucket_cachep
, pp
);
5767 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
5771 /* Release this socket's reference to a local port. */
5772 static inline void __sctp_put_port(struct sock
*sk
)
5774 struct sctp_bind_hashbucket
*head
=
5775 &sctp_port_hashtable
[sctp_phashfn(inet_sk(sk
)->inet_num
)];
5776 struct sctp_bind_bucket
*pp
;
5778 sctp_spin_lock(&head
->lock
);
5779 pp
= sctp_sk(sk
)->bind_hash
;
5780 __sk_del_bind_node(sk
);
5781 sctp_sk(sk
)->bind_hash
= NULL
;
5782 inet_sk(sk
)->inet_num
= 0;
5783 sctp_bucket_destroy(pp
);
5784 sctp_spin_unlock(&head
->lock
);
5787 void sctp_put_port(struct sock
*sk
)
5789 sctp_local_bh_disable();
5790 __sctp_put_port(sk
);
5791 sctp_local_bh_enable();
5795 * The system picks an ephemeral port and choose an address set equivalent
5796 * to binding with a wildcard address.
5797 * One of those addresses will be the primary address for the association.
5798 * This automatically enables the multihoming capability of SCTP.
5800 static int sctp_autobind(struct sock
*sk
)
5802 union sctp_addr autoaddr
;
5806 /* Initialize a local sockaddr structure to INADDR_ANY. */
5807 af
= sctp_sk(sk
)->pf
->af
;
5809 port
= htons(inet_sk(sk
)->inet_num
);
5810 af
->inaddr_any(&autoaddr
, port
);
5812 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
5815 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5818 * 4.2 The cmsghdr Structure *
5820 * When ancillary data is sent or received, any number of ancillary data
5821 * objects can be specified by the msg_control and msg_controllen members of
5822 * the msghdr structure, because each object is preceded by
5823 * a cmsghdr structure defining the object's length (the cmsg_len member).
5824 * Historically Berkeley-derived implementations have passed only one object
5825 * at a time, but this API allows multiple objects to be
5826 * passed in a single call to sendmsg() or recvmsg(). The following example
5827 * shows two ancillary data objects in a control buffer.
5829 * |<--------------------------- msg_controllen -------------------------->|
5832 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5834 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5837 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5839 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5842 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5843 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5845 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5847 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5854 SCTP_STATIC
int sctp_msghdr_parse(const struct msghdr
*msg
,
5855 sctp_cmsgs_t
*cmsgs
)
5857 struct cmsghdr
*cmsg
;
5858 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
5860 for (cmsg
= CMSG_FIRSTHDR(msg
);
5862 cmsg
= CMSG_NXTHDR(my_msg
, cmsg
)) {
5863 if (!CMSG_OK(my_msg
, cmsg
))
5866 /* Should we parse this header or ignore? */
5867 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
5870 /* Strictly check lengths following example in SCM code. */
5871 switch (cmsg
->cmsg_type
) {
5873 /* SCTP Socket API Extension
5874 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5876 * This cmsghdr structure provides information for
5877 * initializing new SCTP associations with sendmsg().
5878 * The SCTP_INITMSG socket option uses this same data
5879 * structure. This structure is not used for
5882 * cmsg_level cmsg_type cmsg_data[]
5883 * ------------ ------------ ----------------------
5884 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5886 if (cmsg
->cmsg_len
!=
5887 CMSG_LEN(sizeof(struct sctp_initmsg
)))
5889 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
5893 /* SCTP Socket API Extension
5894 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5896 * This cmsghdr structure specifies SCTP options for
5897 * sendmsg() and describes SCTP header information
5898 * about a received message through recvmsg().
5900 * cmsg_level cmsg_type cmsg_data[]
5901 * ------------ ------------ ----------------------
5902 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5904 if (cmsg
->cmsg_len
!=
5905 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
5909 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
5911 /* Minimally, validate the sinfo_flags. */
5912 if (cmsgs
->info
->sinfo_flags
&
5913 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
5914 SCTP_ABORT
| SCTP_EOF
))
5926 * Wait for a packet..
5927 * Note: This function is the same function as in core/datagram.c
5928 * with a few modifications to make lksctp work.
5930 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
5935 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
5937 /* Socket errors? */
5938 error
= sock_error(sk
);
5942 if (!skb_queue_empty(&sk
->sk_receive_queue
))
5945 /* Socket shut down? */
5946 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
5949 /* Sequenced packets can come disconnected. If so we report the
5954 /* Is there a good reason to think that we may receive some data? */
5955 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
5958 /* Handle signals. */
5959 if (signal_pending(current
))
5962 /* Let another process have a go. Since we are going to sleep
5963 * anyway. Note: This may cause odd behaviors if the message
5964 * does not fit in the user's buffer, but this seems to be the
5965 * only way to honor MSG_DONTWAIT realistically.
5967 sctp_release_sock(sk
);
5968 *timeo_p
= schedule_timeout(*timeo_p
);
5972 finish_wait(sk_sleep(sk
), &wait
);
5976 error
= sock_intr_errno(*timeo_p
);
5979 finish_wait(sk_sleep(sk
), &wait
);
5984 /* Receive a datagram.
5985 * Note: This is pretty much the same routine as in core/datagram.c
5986 * with a few changes to make lksctp work.
5988 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
5989 int noblock
, int *err
)
5992 struct sk_buff
*skb
;
5995 timeo
= sock_rcvtimeo(sk
, noblock
);
5997 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
5998 timeo
, MAX_SCHEDULE_TIMEOUT
);
6001 /* Again only user level code calls this function,
6002 * so nothing interrupt level
6003 * will suddenly eat the receive_queue.
6005 * Look at current nfs client by the way...
6006 * However, this function was corrent in any case. 8)
6008 if (flags
& MSG_PEEK
) {
6009 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
6010 skb
= skb_peek(&sk
->sk_receive_queue
);
6012 atomic_inc(&skb
->users
);
6013 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
6015 skb
= skb_dequeue(&sk
->sk_receive_queue
);
6021 /* Caller is allowed not to check sk->sk_err before calling. */
6022 error
= sock_error(sk
);
6026 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6029 /* User doesn't want to wait. */
6033 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
6042 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6043 static void __sctp_write_space(struct sctp_association
*asoc
)
6045 struct sock
*sk
= asoc
->base
.sk
;
6046 struct socket
*sock
= sk
->sk_socket
;
6048 if ((sctp_wspace(asoc
) > 0) && sock
) {
6049 if (waitqueue_active(&asoc
->wait
))
6050 wake_up_interruptible(&asoc
->wait
);
6052 if (sctp_writeable(sk
)) {
6053 if (sk_sleep(sk
) && waitqueue_active(sk_sleep(sk
)))
6054 wake_up_interruptible(sk_sleep(sk
));
6056 /* Note that we try to include the Async I/O support
6057 * here by modeling from the current TCP/UDP code.
6058 * We have not tested with it yet.
6060 if (sock
->wq
->fasync_list
&&
6061 !(sk
->sk_shutdown
& SEND_SHUTDOWN
))
6062 sock_wake_async(sock
,
6063 SOCK_WAKE_SPACE
, POLL_OUT
);
6068 /* Do accounting for the sndbuf space.
6069 * Decrement the used sndbuf space of the corresponding association by the
6070 * data size which was just transmitted(freed).
6072 static void sctp_wfree(struct sk_buff
*skb
)
6074 struct sctp_association
*asoc
;
6075 struct sctp_chunk
*chunk
;
6078 /* Get the saved chunk pointer. */
6079 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
6082 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
6083 sizeof(struct sk_buff
) +
6084 sizeof(struct sctp_chunk
);
6086 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
6089 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6091 sk
->sk_wmem_queued
-= skb
->truesize
;
6092 sk_mem_uncharge(sk
, skb
->truesize
);
6095 __sctp_write_space(asoc
);
6097 sctp_association_put(asoc
);
6100 /* Do accounting for the receive space on the socket.
6101 * Accounting for the association is done in ulpevent.c
6102 * We set this as a destructor for the cloned data skbs so that
6103 * accounting is done at the correct time.
6105 void sctp_sock_rfree(struct sk_buff
*skb
)
6107 struct sock
*sk
= skb
->sk
;
6108 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
6110 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
6113 * Mimic the behavior of sock_rfree
6115 sk_mem_uncharge(sk
, event
->rmem_len
);
6119 /* Helper function to wait for space in the sndbuf. */
6120 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
6123 struct sock
*sk
= asoc
->base
.sk
;
6125 long current_timeo
= *timeo_p
;
6128 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6129 asoc
, (long)(*timeo_p
), msg_len
);
6131 /* Increment the association's refcnt. */
6132 sctp_association_hold(asoc
);
6134 /* Wait on the association specific sndbuf space. */
6136 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6137 TASK_INTERRUPTIBLE
);
6140 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6143 if (signal_pending(current
))
6144 goto do_interrupted
;
6145 if (msg_len
<= sctp_wspace(asoc
))
6148 /* Let another process have a go. Since we are going
6151 sctp_release_sock(sk
);
6152 current_timeo
= schedule_timeout(current_timeo
);
6153 BUG_ON(sk
!= asoc
->base
.sk
);
6156 *timeo_p
= current_timeo
;
6160 finish_wait(&asoc
->wait
, &wait
);
6162 /* Release the association's refcnt. */
6163 sctp_association_put(asoc
);
6172 err
= sock_intr_errno(*timeo_p
);
6180 void sctp_data_ready(struct sock
*sk
, int len
)
6182 struct socket_wq
*wq
;
6185 wq
= rcu_dereference(sk
->sk_wq
);
6186 if (wq_has_sleeper(wq
))
6187 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
6188 POLLRDNORM
| POLLRDBAND
);
6189 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
6193 /* If socket sndbuf has changed, wake up all per association waiters. */
6194 void sctp_write_space(struct sock
*sk
)
6196 struct sctp_association
*asoc
;
6198 /* Wake up the tasks in each wait queue. */
6199 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
6200 __sctp_write_space(asoc
);
6204 /* Is there any sndbuf space available on the socket?
6206 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6207 * associations on the same socket. For a UDP-style socket with
6208 * multiple associations, it is possible for it to be "unwriteable"
6209 * prematurely. I assume that this is acceptable because
6210 * a premature "unwriteable" is better than an accidental "writeable" which
6211 * would cause an unwanted block under certain circumstances. For the 1-1
6212 * UDP-style sockets or TCP-style sockets, this code should work.
6215 static int sctp_writeable(struct sock
*sk
)
6219 amt
= sk
->sk_sndbuf
- sk_wmem_alloc_get(sk
);
6225 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6226 * returns immediately with EINPROGRESS.
6228 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
6230 struct sock
*sk
= asoc
->base
.sk
;
6232 long current_timeo
= *timeo_p
;
6235 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__
, asoc
,
6238 /* Increment the association's refcnt. */
6239 sctp_association_hold(asoc
);
6242 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6243 TASK_INTERRUPTIBLE
);
6246 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6248 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6251 if (signal_pending(current
))
6252 goto do_interrupted
;
6254 if (sctp_state(asoc
, ESTABLISHED
))
6257 /* Let another process have a go. Since we are going
6260 sctp_release_sock(sk
);
6261 current_timeo
= schedule_timeout(current_timeo
);
6264 *timeo_p
= current_timeo
;
6268 finish_wait(&asoc
->wait
, &wait
);
6270 /* Release the association's refcnt. */
6271 sctp_association_put(asoc
);
6276 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
6279 err
= -ECONNREFUSED
;
6283 err
= sock_intr_errno(*timeo_p
);
6291 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
6293 struct sctp_endpoint
*ep
;
6297 ep
= sctp_sk(sk
)->ep
;
6301 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
6302 TASK_INTERRUPTIBLE
);
6304 if (list_empty(&ep
->asocs
)) {
6305 sctp_release_sock(sk
);
6306 timeo
= schedule_timeout(timeo
);
6311 if (!sctp_sstate(sk
, LISTENING
))
6315 if (!list_empty(&ep
->asocs
))
6318 err
= sock_intr_errno(timeo
);
6319 if (signal_pending(current
))
6327 finish_wait(sk_sleep(sk
), &wait
);
6332 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
6337 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
6338 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
6340 sctp_release_sock(sk
);
6341 timeout
= schedule_timeout(timeout
);
6343 } while (!signal_pending(current
) && timeout
);
6345 finish_wait(sk_sleep(sk
), &wait
);
6348 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
6350 struct sk_buff
*frag
;
6355 /* Don't forget the fragments. */
6356 skb_walk_frags(skb
, frag
)
6357 sctp_skb_set_owner_r_frag(frag
, sk
);
6360 sctp_skb_set_owner_r(skb
, sk
);
6363 void sctp_copy_sock(struct sock
*newsk
, struct sock
*sk
,
6364 struct sctp_association
*asoc
)
6366 struct inet_sock
*inet
= inet_sk(sk
);
6367 struct inet_sock
*newinet
;
6369 newsk
->sk_type
= sk
->sk_type
;
6370 newsk
->sk_bound_dev_if
= sk
->sk_bound_dev_if
;
6371 newsk
->sk_flags
= sk
->sk_flags
;
6372 newsk
->sk_no_check
= sk
->sk_no_check
;
6373 newsk
->sk_reuse
= sk
->sk_reuse
;
6375 newsk
->sk_shutdown
= sk
->sk_shutdown
;
6376 newsk
->sk_destruct
= inet_sock_destruct
;
6377 newsk
->sk_family
= sk
->sk_family
;
6378 newsk
->sk_protocol
= IPPROTO_SCTP
;
6379 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
6380 newsk
->sk_sndbuf
= sk
->sk_sndbuf
;
6381 newsk
->sk_rcvbuf
= sk
->sk_rcvbuf
;
6382 newsk
->sk_lingertime
= sk
->sk_lingertime
;
6383 newsk
->sk_rcvtimeo
= sk
->sk_rcvtimeo
;
6384 newsk
->sk_sndtimeo
= sk
->sk_sndtimeo
;
6386 newinet
= inet_sk(newsk
);
6388 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6389 * getsockname() and getpeername()
6391 newinet
->inet_sport
= inet
->inet_sport
;
6392 newinet
->inet_saddr
= inet
->inet_saddr
;
6393 newinet
->inet_rcv_saddr
= inet
->inet_rcv_saddr
;
6394 newinet
->inet_dport
= htons(asoc
->peer
.port
);
6395 newinet
->pmtudisc
= inet
->pmtudisc
;
6396 newinet
->inet_id
= asoc
->next_tsn
^ jiffies
;
6398 newinet
->uc_ttl
= inet
->uc_ttl
;
6399 newinet
->mc_loop
= 1;
6400 newinet
->mc_ttl
= 1;
6401 newinet
->mc_index
= 0;
6402 newinet
->mc_list
= NULL
;
6405 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6406 * and its messages to the newsk.
6408 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
6409 struct sctp_association
*assoc
,
6410 sctp_socket_type_t type
)
6412 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
6413 struct sctp_sock
*newsp
= sctp_sk(newsk
);
6414 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
6415 struct sctp_endpoint
*newep
= newsp
->ep
;
6416 struct sk_buff
*skb
, *tmp
;
6417 struct sctp_ulpevent
*event
;
6418 struct sctp_bind_hashbucket
*head
;
6420 /* Migrate socket buffer sizes and all the socket level options to the
6423 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
6424 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
6425 /* Brute force copy old sctp opt. */
6426 inet_sk_copy_descendant(newsk
, oldsk
);
6428 /* Restore the ep value that was overwritten with the above structure
6434 /* Hook this new socket in to the bind_hash list. */
6435 head
= &sctp_port_hashtable
[sctp_phashfn(inet_sk(oldsk
)->inet_num
)];
6436 sctp_local_bh_disable();
6437 sctp_spin_lock(&head
->lock
);
6438 pp
= sctp_sk(oldsk
)->bind_hash
;
6439 sk_add_bind_node(newsk
, &pp
->owner
);
6440 sctp_sk(newsk
)->bind_hash
= pp
;
6441 inet_sk(newsk
)->inet_num
= inet_sk(oldsk
)->inet_num
;
6442 sctp_spin_unlock(&head
->lock
);
6443 sctp_local_bh_enable();
6445 /* Copy the bind_addr list from the original endpoint to the new
6446 * endpoint so that we can handle restarts properly
6448 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
6449 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
6451 /* Move any messages in the old socket's receive queue that are for the
6452 * peeled off association to the new socket's receive queue.
6454 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
6455 event
= sctp_skb2event(skb
);
6456 if (event
->asoc
== assoc
) {
6457 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
6458 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
6459 sctp_skb_set_owner_r_frag(skb
, newsk
);
6463 /* Clean up any messages pending delivery due to partial
6464 * delivery. Three cases:
6465 * 1) No partial deliver; no work.
6466 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6467 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6469 skb_queue_head_init(&newsp
->pd_lobby
);
6470 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
6472 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
6473 struct sk_buff_head
*queue
;
6475 /* Decide which queue to move pd_lobby skbs to. */
6476 if (assoc
->ulpq
.pd_mode
) {
6477 queue
= &newsp
->pd_lobby
;
6479 queue
= &newsk
->sk_receive_queue
;
6481 /* Walk through the pd_lobby, looking for skbs that
6482 * need moved to the new socket.
6484 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6485 event
= sctp_skb2event(skb
);
6486 if (event
->asoc
== assoc
) {
6487 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6488 __skb_queue_tail(queue
, skb
);
6489 sctp_skb_set_owner_r_frag(skb
, newsk
);
6493 /* Clear up any skbs waiting for the partial
6494 * delivery to finish.
6496 if (assoc
->ulpq
.pd_mode
)
6497 sctp_clear_pd(oldsk
, NULL
);
6501 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
)
6502 sctp_skb_set_owner_r_frag(skb
, newsk
);
6504 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
)
6505 sctp_skb_set_owner_r_frag(skb
, newsk
);
6507 /* Set the type of socket to indicate that it is peeled off from the
6508 * original UDP-style socket or created with the accept() call on a
6509 * TCP-style socket..
6513 /* Mark the new socket "in-use" by the user so that any packets
6514 * that may arrive on the association after we've moved it are
6515 * queued to the backlog. This prevents a potential race between
6516 * backlog processing on the old socket and new-packet processing
6517 * on the new socket.
6519 * The caller has just allocated newsk so we can guarantee that other
6520 * paths won't try to lock it and then oldsk.
6522 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
6523 sctp_assoc_migrate(assoc
, newsk
);
6525 /* If the association on the newsk is already closed before accept()
6526 * is called, set RCV_SHUTDOWN flag.
6528 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
6529 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
6531 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
6532 sctp_release_sock(newsk
);
6536 /* This proto struct describes the ULP interface for SCTP. */
6537 struct proto sctp_prot
= {
6539 .owner
= THIS_MODULE
,
6540 .close
= sctp_close
,
6541 .connect
= sctp_connect
,
6542 .disconnect
= sctp_disconnect
,
6543 .accept
= sctp_accept
,
6544 .ioctl
= sctp_ioctl
,
6545 .init
= sctp_init_sock
,
6546 .destroy
= sctp_destroy_sock
,
6547 .shutdown
= sctp_shutdown
,
6548 .setsockopt
= sctp_setsockopt
,
6549 .getsockopt
= sctp_getsockopt
,
6550 .sendmsg
= sctp_sendmsg
,
6551 .recvmsg
= sctp_recvmsg
,
6553 .backlog_rcv
= sctp_backlog_rcv
,
6555 .unhash
= sctp_unhash
,
6556 .get_port
= sctp_get_port
,
6557 .obj_size
= sizeof(struct sctp_sock
),
6558 .sysctl_mem
= sysctl_sctp_mem
,
6559 .sysctl_rmem
= sysctl_sctp_rmem
,
6560 .sysctl_wmem
= sysctl_sctp_wmem
,
6561 .memory_pressure
= &sctp_memory_pressure
,
6562 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6563 .memory_allocated
= &sctp_memory_allocated
,
6564 .sockets_allocated
= &sctp_sockets_allocated
,
6567 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6569 struct proto sctpv6_prot
= {
6571 .owner
= THIS_MODULE
,
6572 .close
= sctp_close
,
6573 .connect
= sctp_connect
,
6574 .disconnect
= sctp_disconnect
,
6575 .accept
= sctp_accept
,
6576 .ioctl
= sctp_ioctl
,
6577 .init
= sctp_init_sock
,
6578 .destroy
= sctp_destroy_sock
,
6579 .shutdown
= sctp_shutdown
,
6580 .setsockopt
= sctp_setsockopt
,
6581 .getsockopt
= sctp_getsockopt
,
6582 .sendmsg
= sctp_sendmsg
,
6583 .recvmsg
= sctp_recvmsg
,
6585 .backlog_rcv
= sctp_backlog_rcv
,
6587 .unhash
= sctp_unhash
,
6588 .get_port
= sctp_get_port
,
6589 .obj_size
= sizeof(struct sctp6_sock
),
6590 .sysctl_mem
= sysctl_sctp_mem
,
6591 .sysctl_rmem
= sysctl_sctp_rmem
,
6592 .sysctl_wmem
= sysctl_sctp_wmem
,
6593 .memory_pressure
= &sctp_memory_pressure
,
6594 .enter_memory_pressure
= sctp_enter_memory_pressure
,
6595 .memory_allocated
= &sctp_memory_allocated
,
6596 .sockets_allocated
= &sctp_sockets_allocated
,
6598 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */