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>
73 #include <linux/file.h>
77 #include <net/route.h>
79 #include <net/inet_common.h>
81 #include <linux/socket.h> /* for sa_family_t */
82 #include <linux/export.h>
84 #include <net/sctp/sctp.h>
85 #include <net/sctp/sm.h>
87 /* Forward declarations for internal helper functions. */
88 static int sctp_writeable(struct sock
*sk
);
89 static void sctp_wfree(struct sk_buff
*skb
);
90 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
92 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
);
93 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
94 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
95 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
96 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
97 union sctp_addr
*addr
, int len
);
98 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
99 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
100 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
101 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
102 static int sctp_send_asconf(struct sctp_association
*asoc
,
103 struct sctp_chunk
*chunk
);
104 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
105 static int sctp_autobind(struct sock
*sk
);
106 static void sctp_sock_migrate(struct sock
*, struct sock
*,
107 struct sctp_association
*, sctp_socket_type_t
);
109 extern struct kmem_cache
*sctp_bucket_cachep
;
110 extern long sysctl_sctp_mem
[3];
111 extern int sysctl_sctp_rmem
[3];
112 extern int sysctl_sctp_wmem
[3];
114 static int sctp_memory_pressure
;
115 static atomic_long_t sctp_memory_allocated
;
116 struct percpu_counter sctp_sockets_allocated
;
118 static void sctp_enter_memory_pressure(struct sock
*sk
)
120 sctp_memory_pressure
= 1;
124 /* Get the sndbuf space available at the time on the association. */
125 static inline int sctp_wspace(struct sctp_association
*asoc
)
129 if (asoc
->ep
->sndbuf_policy
)
130 amt
= asoc
->sndbuf_used
;
132 amt
= sk_wmem_alloc_get(asoc
->base
.sk
);
134 if (amt
>= asoc
->base
.sk
->sk_sndbuf
) {
135 if (asoc
->base
.sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)
138 amt
= sk_stream_wspace(asoc
->base
.sk
);
143 amt
= asoc
->base
.sk
->sk_sndbuf
- amt
;
148 /* Increment the used sndbuf space count of the corresponding association by
149 * the size of the outgoing data chunk.
150 * Also, set the skb destructor for sndbuf accounting later.
152 * Since it is always 1-1 between chunk and skb, and also a new skb is always
153 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
154 * destructor in the data chunk skb for the purpose of the sndbuf space
157 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
159 struct sctp_association
*asoc
= chunk
->asoc
;
160 struct sock
*sk
= asoc
->base
.sk
;
162 /* The sndbuf space is tracked per association. */
163 sctp_association_hold(asoc
);
165 skb_set_owner_w(chunk
->skb
, sk
);
167 chunk
->skb
->destructor
= sctp_wfree
;
168 /* Save the chunk pointer in skb for sctp_wfree to use later. */
169 *((struct sctp_chunk
**)(chunk
->skb
->cb
)) = chunk
;
171 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
172 sizeof(struct sk_buff
) +
173 sizeof(struct sctp_chunk
);
175 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
176 sk
->sk_wmem_queued
+= chunk
->skb
->truesize
;
177 sk_mem_charge(sk
, chunk
->skb
->truesize
);
180 /* Verify that this is a valid address. */
181 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
186 /* Verify basic sockaddr. */
187 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
191 /* Is this a valid SCTP address? */
192 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
195 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
201 /* Look up the association by its id. If this is not a UDP-style
202 * socket, the ID field is always ignored.
204 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
206 struct sctp_association
*asoc
= NULL
;
208 /* If this is not a UDP-style socket, assoc id should be ignored. */
209 if (!sctp_style(sk
, UDP
)) {
210 /* Return NULL if the socket state is not ESTABLISHED. It
211 * could be a TCP-style listening socket or a socket which
212 * hasn't yet called connect() to establish an association.
214 if (!sctp_sstate(sk
, ESTABLISHED
))
217 /* Get the first and the only association from the list. */
218 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
219 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
220 struct sctp_association
, asocs
);
224 /* Otherwise this is a UDP-style socket. */
225 if (!id
|| (id
== (sctp_assoc_t
)-1))
228 spin_lock_bh(&sctp_assocs_id_lock
);
229 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
230 spin_unlock_bh(&sctp_assocs_id_lock
);
232 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
238 /* Look up the transport from an address and an assoc id. If both address and
239 * id are specified, the associations matching the address and the id should be
242 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
243 struct sockaddr_storage
*addr
,
246 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
247 struct sctp_transport
*transport
;
248 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
250 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
257 id_asoc
= sctp_id2assoc(sk
, id
);
258 if (id_asoc
&& (id_asoc
!= addr_asoc
))
261 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
262 (union sctp_addr
*)addr
);
267 /* API 3.1.2 bind() - UDP Style Syntax
268 * The syntax of bind() is,
270 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
272 * sd - the socket descriptor returned by socket().
273 * addr - the address structure (struct sockaddr_in or struct
274 * sockaddr_in6 [RFC 2553]),
275 * addr_len - the size of the address structure.
277 static int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
283 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
286 /* Disallow binding twice. */
287 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
288 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
293 sctp_release_sock(sk
);
298 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
300 /* Verify this is a valid sockaddr. */
301 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
302 union sctp_addr
*addr
, int len
)
306 /* Check minimum size. */
307 if (len
< sizeof (struct sockaddr
))
310 /* V4 mapped address are really of AF_INET family */
311 if (addr
->sa
.sa_family
== AF_INET6
&&
312 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
)) {
313 if (!opt
->pf
->af_supported(AF_INET
, opt
))
316 /* Does this PF support this AF? */
317 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
321 /* If we get this far, af is valid. */
322 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
324 if (len
< af
->sockaddr_len
)
330 /* Bind a local address either to an endpoint or to an association. */
331 static int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
333 struct net
*net
= sock_net(sk
);
334 struct sctp_sock
*sp
= sctp_sk(sk
);
335 struct sctp_endpoint
*ep
= sp
->ep
;
336 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
341 /* Common sockaddr verification. */
342 af
= sctp_sockaddr_af(sp
, addr
, len
);
344 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
349 snum
= ntohs(addr
->v4
.sin_port
);
351 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
352 ", port: %d, new port: %d, len: %d)\n",
358 /* PF specific bind() address verification. */
359 if (!sp
->pf
->bind_verify(sp
, addr
))
360 return -EADDRNOTAVAIL
;
362 /* We must either be unbound, or bind to the same port.
363 * It's OK to allow 0 ports if we are already bound.
364 * We'll just inhert an already bound port in this case
369 else if (snum
!= bp
->port
) {
370 SCTP_DEBUG_PRINTK("sctp_do_bind:"
371 " New port %d does not match existing port "
372 "%d.\n", snum
, bp
->port
);
377 if (snum
&& snum
< PROT_SOCK
&&
378 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
))
381 /* See if the address matches any of the addresses we may have
382 * already bound before checking against other endpoints.
384 if (sctp_bind_addr_match(bp
, addr
, sp
))
387 /* Make sure we are allowed to bind here.
388 * The function sctp_get_port_local() does duplicate address
391 addr
->v4
.sin_port
= htons(snum
);
392 if ((ret
= sctp_get_port_local(sk
, addr
))) {
396 /* Refresh ephemeral port. */
398 bp
->port
= inet_sk(sk
)->inet_num
;
400 /* Add the address to the bind address list.
401 * Use GFP_ATOMIC since BHs will be disabled.
403 ret
= sctp_add_bind_addr(bp
, addr
, SCTP_ADDR_SRC
, GFP_ATOMIC
);
405 /* Copy back into socket for getsockname() use. */
407 inet_sk(sk
)->inet_sport
= htons(inet_sk(sk
)->inet_num
);
408 af
->to_sk_saddr(addr
, sk
);
414 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
416 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
417 * at any one time. If a sender, after sending an ASCONF chunk, decides
418 * it needs to transfer another ASCONF Chunk, it MUST wait until the
419 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
420 * subsequent ASCONF. Note this restriction binds each side, so at any
421 * time two ASCONF may be in-transit on any given association (one sent
422 * from each endpoint).
424 static int sctp_send_asconf(struct sctp_association
*asoc
,
425 struct sctp_chunk
*chunk
)
427 struct net
*net
= sock_net(asoc
->base
.sk
);
430 /* If there is an outstanding ASCONF chunk, queue it for later
433 if (asoc
->addip_last_asconf
) {
434 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
438 /* Hold the chunk until an ASCONF_ACK is received. */
439 sctp_chunk_hold(chunk
);
440 retval
= sctp_primitive_ASCONF(net
, asoc
, chunk
);
442 sctp_chunk_free(chunk
);
444 asoc
->addip_last_asconf
= chunk
;
450 /* Add a list of addresses as bind addresses to local endpoint or
453 * Basically run through each address specified in the addrs/addrcnt
454 * array/length pair, determine if it is IPv6 or IPv4 and call
455 * sctp_do_bind() on it.
457 * If any of them fails, then the operation will be reversed and the
458 * ones that were added will be removed.
460 * Only sctp_setsockopt_bindx() is supposed to call this function.
462 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
467 struct sockaddr
*sa_addr
;
470 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
474 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
475 /* The list may contain either IPv4 or IPv6 address;
476 * determine the address length for walking thru the list.
479 af
= sctp_get_af_specific(sa_addr
->sa_family
);
485 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
488 addr_buf
+= af
->sockaddr_len
;
492 /* Failed. Cleanup the ones that have been added */
494 sctp_bindx_rem(sk
, addrs
, cnt
);
502 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
503 * associations that are part of the endpoint indicating that a list of local
504 * addresses are added to the endpoint.
506 * If any of the addresses is already in the bind address list of the
507 * association, we do not send the chunk for that association. But it will not
508 * affect other associations.
510 * Only sctp_setsockopt_bindx() is supposed to call this function.
512 static int sctp_send_asconf_add_ip(struct sock
*sk
,
513 struct sockaddr
*addrs
,
516 struct net
*net
= sock_net(sk
);
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 (!net
->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
++) {
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 /* Add the new addresses to the bind address list with
587 * use_as_src set to 0.
590 for (i
= 0; i
< addrcnt
; i
++) {
592 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
593 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
594 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
595 SCTP_ADDR_NEW
, GFP_ATOMIC
);
596 addr_buf
+= af
->sockaddr_len
;
598 if (asoc
->src_out_of_asoc_ok
) {
599 struct sctp_transport
*trans
;
601 list_for_each_entry(trans
,
602 &asoc
->peer
.transport_addr_list
, transports
) {
603 /* Clear the source and route cache */
604 dst_release(trans
->dst
);
605 trans
->cwnd
= min(4*asoc
->pathmtu
, max_t(__u32
,
606 2*asoc
->pathmtu
, 4380));
607 trans
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
608 trans
->rto
= asoc
->rto_initial
;
609 sctp_max_rto(asoc
, trans
);
610 trans
->rtt
= trans
->srtt
= trans
->rttvar
= 0;
611 sctp_transport_route(trans
, NULL
,
612 sctp_sk(asoc
->base
.sk
));
615 retval
= sctp_send_asconf(asoc
, chunk
);
622 /* Remove a list of addresses from bind addresses list. Do not remove the
625 * Basically run through each address specified in the addrs/addrcnt
626 * array/length pair, determine if it is IPv6 or IPv4 and call
627 * sctp_del_bind() on it.
629 * If any of them fails, then the operation will be reversed and the
630 * ones that were removed will be added back.
632 * At least one address has to be left; if only one address is
633 * available, the operation will return -EBUSY.
635 * Only sctp_setsockopt_bindx() is supposed to call this function.
637 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
639 struct sctp_sock
*sp
= sctp_sk(sk
);
640 struct sctp_endpoint
*ep
= sp
->ep
;
642 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
645 union sctp_addr
*sa_addr
;
648 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
652 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
653 /* If the bind address list is empty or if there is only one
654 * bind address, there is nothing more to be removed (we need
655 * at least one address here).
657 if (list_empty(&bp
->address_list
) ||
658 (sctp_list_single_entry(&bp
->address_list
))) {
664 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
670 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
671 retval
= -EADDRNOTAVAIL
;
675 if (sa_addr
->v4
.sin_port
&&
676 sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
681 if (!sa_addr
->v4
.sin_port
)
682 sa_addr
->v4
.sin_port
= htons(bp
->port
);
684 /* FIXME - There is probably a need to check if sk->sk_saddr and
685 * sk->sk_rcv_addr are currently set to one of the addresses to
686 * be removed. This is something which needs to be looked into
687 * when we are fixing the outstanding issues with multi-homing
688 * socket routing and failover schemes. Refer to comments in
689 * sctp_do_bind(). -daisy
691 retval
= sctp_del_bind_addr(bp
, sa_addr
);
693 addr_buf
+= af
->sockaddr_len
;
696 /* Failed. Add the ones that has been removed back */
698 sctp_bindx_add(sk
, addrs
, cnt
);
706 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
707 * the associations that are part of the endpoint indicating that a list of
708 * local addresses are removed from the endpoint.
710 * If any of the addresses is already in the bind address list of the
711 * association, we do not send the chunk for that association. But it will not
712 * affect other associations.
714 * Only sctp_setsockopt_bindx() is supposed to call this function.
716 static int sctp_send_asconf_del_ip(struct sock
*sk
,
717 struct sockaddr
*addrs
,
720 struct net
*net
= sock_net(sk
);
721 struct sctp_sock
*sp
;
722 struct sctp_endpoint
*ep
;
723 struct sctp_association
*asoc
;
724 struct sctp_transport
*transport
;
725 struct sctp_bind_addr
*bp
;
726 struct sctp_chunk
*chunk
;
727 union sctp_addr
*laddr
;
730 struct sctp_sockaddr_entry
*saddr
;
736 if (!net
->sctp
.addip_enable
)
742 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
743 __func__
, sk
, addrs
, addrcnt
);
745 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
747 if (!asoc
->peer
.asconf_capable
)
750 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
753 if (!sctp_state(asoc
, ESTABLISHED
))
756 /* Check if any address in the packed array of addresses is
757 * not present in the bind address list of the association.
758 * If so, do not send the asconf chunk to its peer, but
759 * continue with other associations.
762 for (i
= 0; i
< addrcnt
; i
++) {
764 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
770 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
773 addr_buf
+= af
->sockaddr_len
;
778 /* Find one address in the association's bind address list
779 * that is not in the packed array of addresses. This is to
780 * make sure that we do not delete all the addresses in the
783 bp
= &asoc
->base
.bind_addr
;
784 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
786 if ((laddr
== NULL
) && (addrcnt
== 1)) {
787 if (asoc
->asconf_addr_del_pending
)
789 asoc
->asconf_addr_del_pending
=
790 kzalloc(sizeof(union sctp_addr
), GFP_ATOMIC
);
791 if (asoc
->asconf_addr_del_pending
== NULL
) {
795 asoc
->asconf_addr_del_pending
->sa
.sa_family
=
797 asoc
->asconf_addr_del_pending
->v4
.sin_port
=
799 if (addrs
->sa_family
== AF_INET
) {
800 struct sockaddr_in
*sin
;
802 sin
= (struct sockaddr_in
*)addrs
;
803 asoc
->asconf_addr_del_pending
->v4
.sin_addr
.s_addr
= sin
->sin_addr
.s_addr
;
804 } else if (addrs
->sa_family
== AF_INET6
) {
805 struct sockaddr_in6
*sin6
;
807 sin6
= (struct sockaddr_in6
*)addrs
;
808 asoc
->asconf_addr_del_pending
->v6
.sin6_addr
= sin6
->sin6_addr
;
810 SCTP_DEBUG_PRINTK_IPADDR("send_asconf_del_ip: keep the last address asoc: %p ",
811 " at %p\n", asoc
, asoc
->asconf_addr_del_pending
,
812 asoc
->asconf_addr_del_pending
);
813 asoc
->src_out_of_asoc_ok
= 1;
818 /* We do not need RCU protection throughout this loop
819 * because this is done under a socket lock from the
822 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
830 /* Reset use_as_src flag for the addresses in the bind address
831 * list that are to be deleted.
834 for (i
= 0; i
< addrcnt
; i
++) {
836 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
837 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
838 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
839 saddr
->state
= SCTP_ADDR_DEL
;
841 addr_buf
+= af
->sockaddr_len
;
844 /* Update the route and saddr entries for all the transports
845 * as some of the addresses in the bind address list are
846 * about to be deleted and cannot be used as source addresses.
848 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
850 dst_release(transport
->dst
);
851 sctp_transport_route(transport
, NULL
,
852 sctp_sk(asoc
->base
.sk
));
856 /* We don't need to transmit ASCONF */
858 retval
= sctp_send_asconf(asoc
, chunk
);
864 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
865 int sctp_asconf_mgmt(struct sctp_sock
*sp
, struct sctp_sockaddr_entry
*addrw
)
867 struct sock
*sk
= sctp_opt2sk(sp
);
868 union sctp_addr
*addr
;
871 /* It is safe to write port space in caller. */
873 addr
->v4
.sin_port
= htons(sp
->ep
->base
.bind_addr
.port
);
874 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
877 if (sctp_verify_addr(sk
, addr
, af
->sockaddr_len
))
880 if (addrw
->state
== SCTP_ADDR_NEW
)
881 return sctp_send_asconf_add_ip(sk
, (struct sockaddr
*)addr
, 1);
883 return sctp_send_asconf_del_ip(sk
, (struct sockaddr
*)addr
, 1);
886 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
889 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
892 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
893 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
896 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
897 * Section 3.1.2 for this usage.
899 * addrs is a pointer to an array of one or more socket addresses. Each
900 * address is contained in its appropriate structure (i.e. struct
901 * sockaddr_in or struct sockaddr_in6) the family of the address type
902 * must be used to distinguish the address length (note that this
903 * representation is termed a "packed array" of addresses). The caller
904 * specifies the number of addresses in the array with addrcnt.
906 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
907 * -1, and sets errno to the appropriate error code.
909 * For SCTP, the port given in each socket address must be the same, or
910 * sctp_bindx() will fail, setting errno to EINVAL.
912 * The flags parameter is formed from the bitwise OR of zero or more of
913 * the following currently defined flags:
915 * SCTP_BINDX_ADD_ADDR
917 * SCTP_BINDX_REM_ADDR
919 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
920 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
921 * addresses from the association. The two flags are mutually exclusive;
922 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
923 * not remove all addresses from an association; sctp_bindx() will
924 * reject such an attempt with EINVAL.
926 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
927 * additional addresses with an endpoint after calling bind(). Or use
928 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
929 * socket is associated with so that no new association accepted will be
930 * associated with those addresses. If the endpoint supports dynamic
931 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
932 * endpoint to send the appropriate message to the peer to change the
933 * peers address lists.
935 * Adding and removing addresses from a connected association is
936 * optional functionality. Implementations that do not support this
937 * functionality should return EOPNOTSUPP.
939 * Basically do nothing but copying the addresses from user to kernel
940 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
941 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
944 * We don't use copy_from_user() for optimization: we first do the
945 * sanity checks (buffer size -fast- and access check-healthy
946 * pointer); if all of those succeed, then we can alloc the memory
947 * (expensive operation) needed to copy the data to kernel. Then we do
948 * the copying without checking the user space area
949 * (__copy_from_user()).
951 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
954 * sk The sk of the socket
955 * addrs The pointer to the addresses in user land
956 * addrssize Size of the addrs buffer
957 * op Operation to perform (add or remove, see the flags of
960 * Returns 0 if ok, <0 errno code on error.
962 static int sctp_setsockopt_bindx(struct sock
* sk
,
963 struct sockaddr __user
*addrs
,
964 int addrs_size
, int op
)
966 struct sockaddr
*kaddrs
;
970 struct sockaddr
*sa_addr
;
974 SCTP_DEBUG_PRINTK("sctp_setsockopt_bindx: sk %p addrs %p"
975 " addrs_size %d opt %d\n", sk
, addrs
, addrs_size
, op
);
977 if (unlikely(addrs_size
<= 0))
980 /* Check the user passed a healthy pointer. */
981 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
984 /* Alloc space for the address array in kernel memory. */
985 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
986 if (unlikely(!kaddrs
))
989 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
994 /* Walk through the addrs buffer and count the number of addresses. */
996 while (walk_size
< addrs_size
) {
997 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1003 af
= sctp_get_af_specific(sa_addr
->sa_family
);
1005 /* If the address family is not supported or if this address
1006 * causes the address buffer to overflow return EINVAL.
1008 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1013 addr_buf
+= af
->sockaddr_len
;
1014 walk_size
+= af
->sockaddr_len
;
1019 case SCTP_BINDX_ADD_ADDR
:
1020 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
1023 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
1026 case SCTP_BINDX_REM_ADDR
:
1027 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
1030 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
1044 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1046 * Common routine for handling connect() and sctp_connectx().
1047 * Connect will come in with just a single address.
1049 static int __sctp_connect(struct sock
* sk
,
1050 struct sockaddr
*kaddrs
,
1052 sctp_assoc_t
*assoc_id
)
1054 struct net
*net
= sock_net(sk
);
1055 struct sctp_sock
*sp
;
1056 struct sctp_endpoint
*ep
;
1057 struct sctp_association
*asoc
= NULL
;
1058 struct sctp_association
*asoc2
;
1059 struct sctp_transport
*transport
;
1067 union sctp_addr
*sa_addr
= NULL
;
1069 unsigned short port
;
1070 unsigned int f_flags
= 0;
1075 /* connect() cannot be done on a socket that is already in ESTABLISHED
1076 * state - UDP-style peeled off socket or a TCP-style socket that
1077 * is already connected.
1078 * It cannot be done even on a TCP-style listening socket.
1080 if (sctp_sstate(sk
, ESTABLISHED
) ||
1081 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
1086 /* Walk through the addrs buffer and count the number of addresses. */
1088 while (walk_size
< addrs_size
) {
1089 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1095 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1097 /* If the address family is not supported or if this address
1098 * causes the address buffer to overflow return EINVAL.
1100 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1105 port
= ntohs(sa_addr
->v4
.sin_port
);
1107 /* Save current address so we can work with it */
1108 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1110 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1114 /* Make sure the destination port is correctly set
1117 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
) {
1122 /* Check if there already is a matching association on the
1123 * endpoint (other than the one created here).
1125 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1126 if (asoc2
&& asoc2
!= asoc
) {
1127 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1134 /* If we could not find a matching association on the endpoint,
1135 * make sure that there is no peeled-off association matching
1136 * the peer address even on another socket.
1138 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1139 err
= -EADDRNOTAVAIL
;
1144 /* If a bind() or sctp_bindx() is not called prior to
1145 * an sctp_connectx() call, the system picks an
1146 * ephemeral port and will choose an address set
1147 * equivalent to binding with a wildcard address.
1149 if (!ep
->base
.bind_addr
.port
) {
1150 if (sctp_autobind(sk
)) {
1156 * If an unprivileged user inherits a 1-many
1157 * style socket with open associations on a
1158 * privileged port, it MAY be permitted to
1159 * accept new associations, but it SHOULD NOT
1160 * be permitted to open new associations.
1162 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1163 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
)) {
1169 scope
= sctp_scope(&to
);
1170 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1176 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
,
1184 /* Prime the peer's transport structures. */
1185 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1193 addr_buf
+= af
->sockaddr_len
;
1194 walk_size
+= af
->sockaddr_len
;
1197 /* In case the user of sctp_connectx() wants an association
1198 * id back, assign one now.
1201 err
= sctp_assoc_set_id(asoc
, GFP_KERNEL
);
1206 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1211 /* Initialize sk's dport and daddr for getpeername() */
1212 inet_sk(sk
)->inet_dport
= htons(asoc
->peer
.port
);
1213 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1214 af
->to_sk_daddr(sa_addr
, sk
);
1217 /* in-kernel sockets don't generally have a file allocated to them
1218 * if all they do is call sock_create_kern().
1220 if (sk
->sk_socket
->file
)
1221 f_flags
= sk
->sk_socket
->file
->f_flags
;
1223 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1225 err
= sctp_wait_for_connect(asoc
, &timeo
);
1226 if ((err
== 0 || err
== -EINPROGRESS
) && assoc_id
)
1227 *assoc_id
= asoc
->assoc_id
;
1229 /* Don't free association on exit. */
1234 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1235 " kaddrs: %p err: %d\n",
1238 /* sctp_primitive_ASSOCIATE may have added this association
1239 * To the hash table, try to unhash it, just in case, its a noop
1240 * if it wasn't hashed so we're safe
1242 sctp_unhash_established(asoc
);
1243 sctp_association_free(asoc
);
1248 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1251 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1252 * sctp_assoc_t *asoc);
1254 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1255 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1256 * or IPv6 addresses.
1258 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1259 * Section 3.1.2 for this usage.
1261 * addrs is a pointer to an array of one or more socket addresses. Each
1262 * address is contained in its appropriate structure (i.e. struct
1263 * sockaddr_in or struct sockaddr_in6) the family of the address type
1264 * must be used to distengish the address length (note that this
1265 * representation is termed a "packed array" of addresses). The caller
1266 * specifies the number of addresses in the array with addrcnt.
1268 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1269 * the association id of the new association. On failure, sctp_connectx()
1270 * returns -1, and sets errno to the appropriate error code. The assoc_id
1271 * is not touched by the kernel.
1273 * For SCTP, the port given in each socket address must be the same, or
1274 * sctp_connectx() will fail, setting errno to EINVAL.
1276 * An application can use sctp_connectx to initiate an association with
1277 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1278 * allows a caller to specify multiple addresses at which a peer can be
1279 * reached. The way the SCTP stack uses the list of addresses to set up
1280 * the association is implementation dependent. This function only
1281 * specifies that the stack will try to make use of all the addresses in
1282 * the list when needed.
1284 * Note that the list of addresses passed in is only used for setting up
1285 * the association. It does not necessarily equal the set of addresses
1286 * the peer uses for the resulting association. If the caller wants to
1287 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1288 * retrieve them after the association has been set up.
1290 * Basically do nothing but copying the addresses from user to kernel
1291 * land and invoking either sctp_connectx(). This is used for tunneling
1292 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1294 * We don't use copy_from_user() for optimization: we first do the
1295 * sanity checks (buffer size -fast- and access check-healthy
1296 * pointer); if all of those succeed, then we can alloc the memory
1297 * (expensive operation) needed to copy the data to kernel. Then we do
1298 * the copying without checking the user space area
1299 * (__copy_from_user()).
1301 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1304 * sk The sk of the socket
1305 * addrs The pointer to the addresses in user land
1306 * addrssize Size of the addrs buffer
1308 * Returns >=0 if ok, <0 errno code on error.
1310 static int __sctp_setsockopt_connectx(struct sock
* sk
,
1311 struct sockaddr __user
*addrs
,
1313 sctp_assoc_t
*assoc_id
)
1316 struct sockaddr
*kaddrs
;
1318 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1319 __func__
, sk
, addrs
, addrs_size
);
1321 if (unlikely(addrs_size
<= 0))
1324 /* Check the user passed a healthy pointer. */
1325 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1328 /* Alloc space for the address array in kernel memory. */
1329 kaddrs
= kmalloc(addrs_size
, GFP_KERNEL
);
1330 if (unlikely(!kaddrs
))
1333 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1336 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, assoc_id
);
1345 * This is an older interface. It's kept for backward compatibility
1346 * to the option that doesn't provide association id.
1348 static int sctp_setsockopt_connectx_old(struct sock
* sk
,
1349 struct sockaddr __user
*addrs
,
1352 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1356 * New interface for the API. The since the API is done with a socket
1357 * option, to make it simple we feed back the association id is as a return
1358 * indication to the call. Error is always negative and association id is
1361 static int sctp_setsockopt_connectx(struct sock
* sk
,
1362 struct sockaddr __user
*addrs
,
1365 sctp_assoc_t assoc_id
= 0;
1368 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1377 * New (hopefully final) interface for the API.
1378 * We use the sctp_getaddrs_old structure so that use-space library
1379 * can avoid any unnecessary allocations. The only defferent part
1380 * is that we store the actual length of the address buffer into the
1381 * addrs_num structure member. That way we can re-use the existing
1384 static int sctp_getsockopt_connectx3(struct sock
* sk
, int len
,
1385 char __user
*optval
,
1388 struct sctp_getaddrs_old param
;
1389 sctp_assoc_t assoc_id
= 0;
1392 if (len
< sizeof(param
))
1395 if (copy_from_user(¶m
, optval
, sizeof(param
)))
1398 err
= __sctp_setsockopt_connectx(sk
,
1399 (struct sockaddr __user
*)param
.addrs
,
1400 param
.addr_num
, &assoc_id
);
1402 if (err
== 0 || err
== -EINPROGRESS
) {
1403 if (copy_to_user(optval
, &assoc_id
, sizeof(assoc_id
)))
1405 if (put_user(sizeof(assoc_id
), optlen
))
1412 /* API 3.1.4 close() - UDP Style Syntax
1413 * Applications use close() to perform graceful shutdown (as described in
1414 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1415 * by a UDP-style socket.
1419 * ret = close(int sd);
1421 * sd - the socket descriptor of the associations to be closed.
1423 * To gracefully shutdown a specific association represented by the
1424 * UDP-style socket, an application should use the sendmsg() call,
1425 * passing no user data, but including the appropriate flag in the
1426 * ancillary data (see Section xxxx).
1428 * If sd in the close() call is a branched-off socket representing only
1429 * one association, the shutdown is performed on that association only.
1431 * 4.1.6 close() - TCP Style Syntax
1433 * Applications use close() to gracefully close down an association.
1437 * int close(int sd);
1439 * sd - the socket descriptor of the association to be closed.
1441 * After an application calls close() on a socket descriptor, no further
1442 * socket operations will succeed on that descriptor.
1444 * API 7.1.4 SO_LINGER
1446 * An application using the TCP-style socket can use this option to
1447 * perform the SCTP ABORT primitive. The linger option structure is:
1450 * int l_onoff; // option on/off
1451 * int l_linger; // linger time
1454 * To enable the option, set l_onoff to 1. If the l_linger value is set
1455 * to 0, calling close() is the same as the ABORT primitive. If the
1456 * value is set to a negative value, the setsockopt() call will return
1457 * an error. If the value is set to a positive value linger_time, the
1458 * close() can be blocked for at most linger_time ms. If the graceful
1459 * shutdown phase does not finish during this period, close() will
1460 * return but the graceful shutdown phase continues in the system.
1462 static void sctp_close(struct sock
*sk
, long timeout
)
1464 struct net
*net
= sock_net(sk
);
1465 struct sctp_endpoint
*ep
;
1466 struct sctp_association
*asoc
;
1467 struct list_head
*pos
, *temp
;
1468 unsigned int data_was_unread
;
1470 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk
, timeout
);
1473 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1474 sk
->sk_state
= SCTP_SS_CLOSING
;
1476 ep
= sctp_sk(sk
)->ep
;
1478 /* Clean up any skbs sitting on the receive queue. */
1479 data_was_unread
= sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1480 data_was_unread
+= sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1482 /* Walk all associations on an endpoint. */
1483 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1484 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1486 if (sctp_style(sk
, TCP
)) {
1487 /* A closed association can still be in the list if
1488 * it belongs to a TCP-style listening socket that is
1489 * not yet accepted. If so, free it. If not, send an
1490 * ABORT or SHUTDOWN based on the linger options.
1492 if (sctp_state(asoc
, CLOSED
)) {
1493 sctp_unhash_established(asoc
);
1494 sctp_association_free(asoc
);
1499 if (data_was_unread
|| !skb_queue_empty(&asoc
->ulpq
.lobby
) ||
1500 !skb_queue_empty(&asoc
->ulpq
.reasm
) ||
1501 (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
)) {
1502 struct sctp_chunk
*chunk
;
1504 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1506 sctp_primitive_ABORT(net
, asoc
, chunk
);
1508 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1511 /* On a TCP-style socket, block for at most linger_time if set. */
1512 if (sctp_style(sk
, TCP
) && timeout
)
1513 sctp_wait_for_close(sk
, timeout
);
1515 /* This will run the backlog queue. */
1516 sctp_release_sock(sk
);
1518 /* Supposedly, no process has access to the socket, but
1519 * the net layers still may.
1521 sctp_local_bh_disable();
1522 sctp_bh_lock_sock(sk
);
1524 /* Hold the sock, since sk_common_release() will put sock_put()
1525 * and we have just a little more cleanup.
1528 sk_common_release(sk
);
1530 sctp_bh_unlock_sock(sk
);
1531 sctp_local_bh_enable();
1535 SCTP_DBG_OBJCNT_DEC(sock
);
1538 /* Handle EPIPE error. */
1539 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1542 err
= sock_error(sk
) ? : -EPIPE
;
1543 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1544 send_sig(SIGPIPE
, current
, 0);
1548 /* API 3.1.3 sendmsg() - UDP Style Syntax
1550 * An application uses sendmsg() and recvmsg() calls to transmit data to
1551 * and receive data from its peer.
1553 * ssize_t sendmsg(int socket, const struct msghdr *message,
1556 * socket - the socket descriptor of the endpoint.
1557 * message - pointer to the msghdr structure which contains a single
1558 * user message and possibly some ancillary data.
1560 * See Section 5 for complete description of the data
1563 * flags - flags sent or received with the user message, see Section
1564 * 5 for complete description of the flags.
1566 * Note: This function could use a rewrite especially when explicit
1567 * connect support comes in.
1569 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1571 static int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1573 static int sctp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
1574 struct msghdr
*msg
, size_t msg_len
)
1576 struct net
*net
= sock_net(sk
);
1577 struct sctp_sock
*sp
;
1578 struct sctp_endpoint
*ep
;
1579 struct sctp_association
*new_asoc
=NULL
, *asoc
=NULL
;
1580 struct sctp_transport
*transport
, *chunk_tp
;
1581 struct sctp_chunk
*chunk
;
1583 struct sockaddr
*msg_name
= NULL
;
1584 struct sctp_sndrcvinfo default_sinfo
;
1585 struct sctp_sndrcvinfo
*sinfo
;
1586 struct sctp_initmsg
*sinit
;
1587 sctp_assoc_t associd
= 0;
1588 sctp_cmsgs_t cmsgs
= { NULL
};
1592 __u16 sinfo_flags
= 0;
1593 struct sctp_datamsg
*datamsg
;
1594 int msg_flags
= msg
->msg_flags
;
1596 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1603 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep
);
1605 /* We cannot send a message over a TCP-style listening socket. */
1606 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1611 /* Parse out the SCTP CMSGs. */
1612 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1615 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err
);
1619 /* Fetch the destination address for this packet. This
1620 * address only selects the association--it is not necessarily
1621 * the address we will send to.
1622 * For a peeled-off socket, msg_name is ignored.
1624 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1625 int msg_namelen
= msg
->msg_namelen
;
1627 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1632 if (msg_namelen
> sizeof(to
))
1633 msg_namelen
= sizeof(to
);
1634 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1635 msg_name
= msg
->msg_name
;
1641 /* Did the user specify SNDRCVINFO? */
1643 sinfo_flags
= sinfo
->sinfo_flags
;
1644 associd
= sinfo
->sinfo_assoc_id
;
1647 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1648 msg_len
, sinfo_flags
);
1650 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1651 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1656 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1657 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1658 * If SCTP_ABORT is set, the message length could be non zero with
1659 * the msg_iov set to the user abort reason.
1661 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1662 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1667 /* If SCTP_ADDR_OVER is set, there must be an address
1668 * specified in msg_name.
1670 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1677 SCTP_DEBUG_PRINTK("About to look up association.\n");
1681 /* If a msg_name has been specified, assume this is to be used. */
1683 /* Look for a matching association on the endpoint. */
1684 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1686 /* If we could not find a matching association on the
1687 * endpoint, make sure that it is not a TCP-style
1688 * socket that already has an association or there is
1689 * no peeled-off association on another socket.
1691 if ((sctp_style(sk
, TCP
) &&
1692 sctp_sstate(sk
, ESTABLISHED
)) ||
1693 sctp_endpoint_is_peeled_off(ep
, &to
)) {
1694 err
= -EADDRNOTAVAIL
;
1699 asoc
= sctp_id2assoc(sk
, associd
);
1707 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc
);
1709 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1710 * socket that has an association in CLOSED state. This can
1711 * happen when an accepted socket has an association that is
1714 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1719 if (sinfo_flags
& SCTP_EOF
) {
1720 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1722 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1726 if (sinfo_flags
& SCTP_ABORT
) {
1728 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1734 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc
);
1735 sctp_primitive_ABORT(net
, asoc
, chunk
);
1741 /* Do we need to create the association? */
1743 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1745 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1750 /* Check for invalid stream against the stream counts,
1751 * either the default or the user specified stream counts.
1754 if (!sinit
|| (sinit
&& !sinit
->sinit_num_ostreams
)) {
1755 /* Check against the defaults. */
1756 if (sinfo
->sinfo_stream
>=
1757 sp
->initmsg
.sinit_num_ostreams
) {
1762 /* Check against the requested. */
1763 if (sinfo
->sinfo_stream
>=
1764 sinit
->sinit_num_ostreams
) {
1772 * API 3.1.2 bind() - UDP Style Syntax
1773 * If a bind() or sctp_bindx() is not called prior to a
1774 * sendmsg() call that initiates a new association, the
1775 * system picks an ephemeral port and will choose an address
1776 * set equivalent to binding with a wildcard address.
1778 if (!ep
->base
.bind_addr
.port
) {
1779 if (sctp_autobind(sk
)) {
1785 * If an unprivileged user inherits a one-to-many
1786 * style socket with open associations on a privileged
1787 * port, it MAY be permitted to accept new associations,
1788 * but it SHOULD NOT be permitted to open new
1791 if (ep
->base
.bind_addr
.port
< PROT_SOCK
&&
1792 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
)) {
1798 scope
= sctp_scope(&to
);
1799 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1805 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
, GFP_KERNEL
);
1811 /* If the SCTP_INIT ancillary data is specified, set all
1812 * the association init values accordingly.
1815 if (sinit
->sinit_num_ostreams
) {
1816 asoc
->c
.sinit_num_ostreams
=
1817 sinit
->sinit_num_ostreams
;
1819 if (sinit
->sinit_max_instreams
) {
1820 asoc
->c
.sinit_max_instreams
=
1821 sinit
->sinit_max_instreams
;
1823 if (sinit
->sinit_max_attempts
) {
1824 asoc
->max_init_attempts
1825 = sinit
->sinit_max_attempts
;
1827 if (sinit
->sinit_max_init_timeo
) {
1828 asoc
->max_init_timeo
=
1829 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1833 /* Prime the peer's transport structures. */
1834 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1841 /* ASSERT: we have a valid association at this point. */
1842 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1845 /* If the user didn't specify SNDRCVINFO, make up one with
1848 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1849 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1850 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1851 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1852 default_sinfo
.sinfo_context
= asoc
->default_context
;
1853 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1854 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1855 sinfo
= &default_sinfo
;
1858 /* API 7.1.7, the sndbuf size per association bounds the
1859 * maximum size of data that can be sent in a single send call.
1861 if (msg_len
> sk
->sk_sndbuf
) {
1866 if (asoc
->pmtu_pending
)
1867 sctp_assoc_pending_pmtu(sk
, asoc
);
1869 /* If fragmentation is disabled and the message length exceeds the
1870 * association fragmentation point, return EMSGSIZE. The I-D
1871 * does not specify what this error is, but this looks like
1874 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1879 /* Check for invalid stream. */
1880 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1885 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1886 if (!sctp_wspace(asoc
)) {
1887 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1892 /* If an address is passed with the sendto/sendmsg call, it is used
1893 * to override the primary destination address in the TCP model, or
1894 * when SCTP_ADDR_OVER flag is set in the UDP model.
1896 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1897 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1898 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1906 /* Auto-connect, if we aren't connected already. */
1907 if (sctp_state(asoc
, CLOSED
)) {
1908 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1911 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1914 /* Break the message into multiple chunks of maximum size. */
1915 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, msg
, msg_len
);
1916 if (IS_ERR(datamsg
)) {
1917 err
= PTR_ERR(datamsg
);
1921 /* Now send the (possibly) fragmented message. */
1922 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1923 sctp_chunk_hold(chunk
);
1925 /* Do accounting for the write space. */
1926 sctp_set_owner_w(chunk
);
1928 chunk
->transport
= chunk_tp
;
1931 /* Send it to the lower layers. Note: all chunks
1932 * must either fail or succeed. The lower layer
1933 * works that way today. Keep it that way or this
1936 err
= sctp_primitive_SEND(net
, asoc
, datamsg
);
1937 /* Did the lower layer accept the chunk? */
1939 sctp_datamsg_free(datamsg
);
1941 sctp_datamsg_put(datamsg
);
1943 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1950 /* If we are already past ASSOCIATE, the lower
1951 * layers are responsible for association cleanup.
1957 sctp_unhash_established(asoc
);
1958 sctp_association_free(asoc
);
1961 sctp_release_sock(sk
);
1964 return sctp_error(sk
, msg_flags
, err
);
1971 err
= sock_error(sk
);
1981 /* This is an extended version of skb_pull() that removes the data from the
1982 * start of a skb even when data is spread across the list of skb's in the
1983 * frag_list. len specifies the total amount of data that needs to be removed.
1984 * when 'len' bytes could be removed from the skb, it returns 0.
1985 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1986 * could not be removed.
1988 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
1990 struct sk_buff
*list
;
1991 int skb_len
= skb_headlen(skb
);
1994 if (len
<= skb_len
) {
1995 __skb_pull(skb
, len
);
1999 __skb_pull(skb
, skb_len
);
2001 skb_walk_frags(skb
, list
) {
2002 rlen
= sctp_skb_pull(list
, len
);
2003 skb
->len
-= (len
-rlen
);
2004 skb
->data_len
-= (len
-rlen
);
2015 /* API 3.1.3 recvmsg() - UDP Style Syntax
2017 * ssize_t recvmsg(int socket, struct msghdr *message,
2020 * socket - the socket descriptor of the endpoint.
2021 * message - pointer to the msghdr structure which contains a single
2022 * user message and possibly some ancillary data.
2024 * See Section 5 for complete description of the data
2027 * flags - flags sent or received with the user message, see Section
2028 * 5 for complete description of the flags.
2030 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*, int, int, int *);
2032 static int sctp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
2033 struct msghdr
*msg
, size_t len
, int noblock
,
2034 int flags
, int *addr_len
)
2036 struct sctp_ulpevent
*event
= NULL
;
2037 struct sctp_sock
*sp
= sctp_sk(sk
);
2038 struct sk_buff
*skb
;
2043 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
2044 "0x%x, %s: %p)\n", "sk", sk
, "msghdr", msg
,
2045 "len", len
, "knoblauch", noblock
,
2046 "flags", flags
, "addr_len", addr_len
);
2050 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
)) {
2055 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
2059 /* Get the total length of the skb including any skb's in the
2068 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
2070 event
= sctp_skb2event(skb
);
2075 sock_recv_ts_and_drops(msg
, sk
, skb
);
2076 if (sctp_ulpevent_is_notification(event
)) {
2077 msg
->msg_flags
|= MSG_NOTIFICATION
;
2078 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
2080 sp
->pf
->skb_msgname(skb
, msg
->msg_name
, addr_len
);
2083 /* Check if we allow SCTP_SNDRCVINFO. */
2084 if (sp
->subscribe
.sctp_data_io_event
)
2085 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
2087 /* FIXME: we should be calling IP/IPv6 layers. */
2088 if (sk
->sk_protinfo
.af_inet
.cmsg_flags
)
2089 ip_cmsg_recv(msg
, skb
);
2094 /* If skb's length exceeds the user's buffer, update the skb and
2095 * push it back to the receive_queue so that the next call to
2096 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2098 if (skb_len
> copied
) {
2099 msg
->msg_flags
&= ~MSG_EOR
;
2100 if (flags
& MSG_PEEK
)
2102 sctp_skb_pull(skb
, copied
);
2103 skb_queue_head(&sk
->sk_receive_queue
, skb
);
2105 /* When only partial message is copied to the user, increase
2106 * rwnd by that amount. If all the data in the skb is read,
2107 * rwnd is updated when the event is freed.
2109 if (!sctp_ulpevent_is_notification(event
))
2110 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
2112 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
2113 (event
->msg_flags
& MSG_EOR
))
2114 msg
->msg_flags
|= MSG_EOR
;
2116 msg
->msg_flags
&= ~MSG_EOR
;
2119 if (flags
& MSG_PEEK
) {
2120 /* Release the skb reference acquired after peeking the skb in
2121 * sctp_skb_recv_datagram().
2125 /* Free the event which includes releasing the reference to
2126 * the owner of the skb, freeing the skb and updating the
2129 sctp_ulpevent_free(event
);
2132 sctp_release_sock(sk
);
2136 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2138 * This option is a on/off flag. If enabled no SCTP message
2139 * fragmentation will be performed. Instead if a message being sent
2140 * exceeds the current PMTU size, the message will NOT be sent and
2141 * instead a error will be indicated to the user.
2143 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
2144 char __user
*optval
,
2145 unsigned int optlen
)
2149 if (optlen
< sizeof(int))
2152 if (get_user(val
, (int __user
*)optval
))
2155 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
2160 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2161 unsigned int optlen
)
2163 struct sctp_association
*asoc
;
2164 struct sctp_ulpevent
*event
;
2166 if (optlen
> sizeof(struct sctp_event_subscribe
))
2168 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2172 * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2173 * if there is no data to be sent or retransmit, the stack will
2174 * immediately send up this notification.
2176 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT
,
2177 &sctp_sk(sk
)->subscribe
)) {
2178 asoc
= sctp_id2assoc(sk
, 0);
2180 if (asoc
&& sctp_outq_is_empty(&asoc
->outqueue
)) {
2181 event
= sctp_ulpevent_make_sender_dry_event(asoc
,
2186 sctp_ulpq_tail_event(&asoc
->ulpq
, event
);
2193 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2195 * This socket option is applicable to the UDP-style socket only. When
2196 * set it will cause associations that are idle for more than the
2197 * specified number of seconds to automatically close. An association
2198 * being idle is defined an association that has NOT sent or received
2199 * user data. The special value of '0' indicates that no automatic
2200 * close of any associations should be performed. The option expects an
2201 * integer defining the number of seconds of idle time before an
2202 * association is closed.
2204 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2205 unsigned int optlen
)
2207 struct sctp_sock
*sp
= sctp_sk(sk
);
2209 /* Applicable to UDP-style socket only */
2210 if (sctp_style(sk
, TCP
))
2212 if (optlen
!= sizeof(int))
2214 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2220 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2222 * Applications can enable or disable heartbeats for any peer address of
2223 * an association, modify an address's heartbeat interval, force a
2224 * heartbeat to be sent immediately, and adjust the address's maximum
2225 * number of retransmissions sent before an address is considered
2226 * unreachable. The following structure is used to access and modify an
2227 * address's parameters:
2229 * struct sctp_paddrparams {
2230 * sctp_assoc_t spp_assoc_id;
2231 * struct sockaddr_storage spp_address;
2232 * uint32_t spp_hbinterval;
2233 * uint16_t spp_pathmaxrxt;
2234 * uint32_t spp_pathmtu;
2235 * uint32_t spp_sackdelay;
2236 * uint32_t spp_flags;
2239 * spp_assoc_id - (one-to-many style socket) This is filled in the
2240 * application, and identifies the association for
2242 * spp_address - This specifies which address is of interest.
2243 * spp_hbinterval - This contains the value of the heartbeat interval,
2244 * in milliseconds. If a value of zero
2245 * is present in this field then no changes are to
2246 * be made to this parameter.
2247 * spp_pathmaxrxt - This contains the maximum number of
2248 * retransmissions before this address shall be
2249 * considered unreachable. If a value of zero
2250 * is present in this field then no changes are to
2251 * be made to this parameter.
2252 * spp_pathmtu - When Path MTU discovery is disabled the value
2253 * specified here will be the "fixed" path mtu.
2254 * Note that if the spp_address field is empty
2255 * then all associations on this address will
2256 * have this fixed path mtu set upon them.
2258 * spp_sackdelay - When delayed sack is enabled, this value specifies
2259 * the number of milliseconds that sacks will be delayed
2260 * for. This value will apply to all addresses of an
2261 * association if the spp_address field is empty. Note
2262 * also, that if delayed sack is enabled and this
2263 * value is set to 0, no change is made to the last
2264 * recorded delayed sack timer value.
2266 * spp_flags - These flags are used to control various features
2267 * on an association. The flag field may contain
2268 * zero or more of the following options.
2270 * SPP_HB_ENABLE - Enable heartbeats on the
2271 * specified address. Note that if the address
2272 * field is empty all addresses for the association
2273 * have heartbeats enabled upon them.
2275 * SPP_HB_DISABLE - Disable heartbeats on the
2276 * speicifed address. Note that if the address
2277 * field is empty all addresses for the association
2278 * will have their heartbeats disabled. Note also
2279 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2280 * mutually exclusive, only one of these two should
2281 * be specified. Enabling both fields will have
2282 * undetermined results.
2284 * SPP_HB_DEMAND - Request a user initiated heartbeat
2285 * to be made immediately.
2287 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2288 * heartbeat delayis to be set to the value of 0
2291 * SPP_PMTUD_ENABLE - This field will enable PMTU
2292 * discovery upon the specified address. Note that
2293 * if the address feild is empty then all addresses
2294 * on the association are effected.
2296 * SPP_PMTUD_DISABLE - This field will disable PMTU
2297 * discovery upon the specified address. Note that
2298 * if the address feild is empty then all addresses
2299 * on the association are effected. Not also that
2300 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2301 * exclusive. Enabling both will have undetermined
2304 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2305 * on delayed sack. The time specified in spp_sackdelay
2306 * is used to specify the sack delay for this address. Note
2307 * that if spp_address is empty then all addresses will
2308 * enable delayed sack and take on the sack delay
2309 * value specified in spp_sackdelay.
2310 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2311 * off delayed sack. If the spp_address field is blank then
2312 * delayed sack is disabled for the entire association. Note
2313 * also that this field is mutually exclusive to
2314 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2317 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2318 struct sctp_transport
*trans
,
2319 struct sctp_association
*asoc
,
2320 struct sctp_sock
*sp
,
2323 int sackdelay_change
)
2327 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2328 struct net
*net
= sock_net(trans
->asoc
->base
.sk
);
2330 error
= sctp_primitive_REQUESTHEARTBEAT(net
, trans
->asoc
, trans
);
2335 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2336 * this field is ignored. Note also that a value of zero indicates
2337 * the current setting should be left unchanged.
2339 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2341 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2342 * set. This lets us use 0 value when this flag
2345 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2346 params
->spp_hbinterval
= 0;
2348 if (params
->spp_hbinterval
||
2349 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2352 msecs_to_jiffies(params
->spp_hbinterval
);
2355 msecs_to_jiffies(params
->spp_hbinterval
);
2357 sp
->hbinterval
= params
->spp_hbinterval
;
2364 trans
->param_flags
=
2365 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2368 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2371 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2375 /* When Path MTU discovery is disabled the value specified here will
2376 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2377 * include the flag SPP_PMTUD_DISABLE for this field to have any
2380 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2382 trans
->pathmtu
= params
->spp_pathmtu
;
2383 sctp_assoc_sync_pmtu(sctp_opt2sk(sp
), asoc
);
2385 asoc
->pathmtu
= params
->spp_pathmtu
;
2386 sctp_frag_point(asoc
, params
->spp_pathmtu
);
2388 sp
->pathmtu
= params
->spp_pathmtu
;
2394 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2395 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2396 trans
->param_flags
=
2397 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2399 sctp_transport_pmtu(trans
, sctp_opt2sk(sp
));
2400 sctp_assoc_sync_pmtu(sctp_opt2sk(sp
), asoc
);
2404 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2407 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2411 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2412 * value of this field is ignored. Note also that a value of zero
2413 * indicates the current setting should be left unchanged.
2415 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2418 msecs_to_jiffies(params
->spp_sackdelay
);
2421 msecs_to_jiffies(params
->spp_sackdelay
);
2423 sp
->sackdelay
= params
->spp_sackdelay
;
2427 if (sackdelay_change
) {
2429 trans
->param_flags
=
2430 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2434 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2438 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2443 /* Note that a value of zero indicates the current setting should be
2446 if (params
->spp_pathmaxrxt
) {
2448 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2450 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2452 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2459 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2460 char __user
*optval
,
2461 unsigned int optlen
)
2463 struct sctp_paddrparams params
;
2464 struct sctp_transport
*trans
= NULL
;
2465 struct sctp_association
*asoc
= NULL
;
2466 struct sctp_sock
*sp
= sctp_sk(sk
);
2468 int hb_change
, pmtud_change
, sackdelay_change
;
2470 if (optlen
!= sizeof(struct sctp_paddrparams
))
2473 if (copy_from_user(¶ms
, optval
, optlen
))
2476 /* Validate flags and value parameters. */
2477 hb_change
= params
.spp_flags
& SPP_HB
;
2478 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2479 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2481 if (hb_change
== SPP_HB
||
2482 pmtud_change
== SPP_PMTUD
||
2483 sackdelay_change
== SPP_SACKDELAY
||
2484 params
.spp_sackdelay
> 500 ||
2485 (params
.spp_pathmtu
&&
2486 params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2489 /* If an address other than INADDR_ANY is specified, and
2490 * no transport is found, then the request is invalid.
2492 if (!sctp_is_any(sk
, ( union sctp_addr
*)¶ms
.spp_address
)) {
2493 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2494 params
.spp_assoc_id
);
2499 /* Get association, if assoc_id != 0 and the socket is a one
2500 * to many style socket, and an association was not found, then
2501 * the id was invalid.
2503 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2504 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2507 /* Heartbeat demand can only be sent on a transport or
2508 * association, but not a socket.
2510 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2513 /* Process parameters. */
2514 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2515 hb_change
, pmtud_change
,
2521 /* If changes are for association, also apply parameters to each
2524 if (!trans
&& asoc
) {
2525 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2527 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2528 hb_change
, pmtud_change
,
2537 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2539 * This option will effect the way delayed acks are performed. This
2540 * option allows you to get or set the delayed ack time, in
2541 * milliseconds. It also allows changing the delayed ack frequency.
2542 * Changing the frequency to 1 disables the delayed sack algorithm. If
2543 * the assoc_id is 0, then this sets or gets the endpoints default
2544 * values. If the assoc_id field is non-zero, then the set or get
2545 * effects the specified association for the one to many model (the
2546 * assoc_id field is ignored by the one to one model). Note that if
2547 * sack_delay or sack_freq are 0 when setting this option, then the
2548 * current values will remain unchanged.
2550 * struct sctp_sack_info {
2551 * sctp_assoc_t sack_assoc_id;
2552 * uint32_t sack_delay;
2553 * uint32_t sack_freq;
2556 * sack_assoc_id - This parameter, indicates which association the user
2557 * is performing an action upon. Note that if this field's value is
2558 * zero then the endpoints default value is changed (effecting future
2559 * associations only).
2561 * sack_delay - This parameter contains the number of milliseconds that
2562 * the user is requesting the delayed ACK timer be set to. Note that
2563 * this value is defined in the standard to be between 200 and 500
2566 * sack_freq - This parameter contains the number of packets that must
2567 * be received before a sack is sent without waiting for the delay
2568 * timer to expire. The default value for this is 2, setting this
2569 * value to 1 will disable the delayed sack algorithm.
2572 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2573 char __user
*optval
, unsigned int optlen
)
2575 struct sctp_sack_info params
;
2576 struct sctp_transport
*trans
= NULL
;
2577 struct sctp_association
*asoc
= NULL
;
2578 struct sctp_sock
*sp
= sctp_sk(sk
);
2580 if (optlen
== sizeof(struct sctp_sack_info
)) {
2581 if (copy_from_user(¶ms
, optval
, optlen
))
2584 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2586 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2587 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2588 pr_warn("Use struct sctp_sack_info instead\n");
2589 if (copy_from_user(¶ms
, optval
, optlen
))
2592 if (params
.sack_delay
== 0)
2593 params
.sack_freq
= 1;
2595 params
.sack_freq
= 0;
2599 /* Validate value parameter. */
2600 if (params
.sack_delay
> 500)
2603 /* Get association, if sack_assoc_id != 0 and the socket is a one
2604 * to many style socket, and an association was not found, then
2605 * the id was invalid.
2607 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2608 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2611 if (params
.sack_delay
) {
2614 msecs_to_jiffies(params
.sack_delay
);
2616 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2617 SPP_SACKDELAY_ENABLE
;
2619 sp
->sackdelay
= params
.sack_delay
;
2621 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2622 SPP_SACKDELAY_ENABLE
;
2626 if (params
.sack_freq
== 1) {
2629 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2630 SPP_SACKDELAY_DISABLE
;
2633 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2634 SPP_SACKDELAY_DISABLE
;
2636 } else if (params
.sack_freq
> 1) {
2638 asoc
->sackfreq
= params
.sack_freq
;
2640 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2641 SPP_SACKDELAY_ENABLE
;
2643 sp
->sackfreq
= params
.sack_freq
;
2645 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2646 SPP_SACKDELAY_ENABLE
;
2650 /* If change is for association, also apply to each transport. */
2652 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2654 if (params
.sack_delay
) {
2656 msecs_to_jiffies(params
.sack_delay
);
2657 trans
->param_flags
=
2658 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2659 SPP_SACKDELAY_ENABLE
;
2661 if (params
.sack_freq
== 1) {
2662 trans
->param_flags
=
2663 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2664 SPP_SACKDELAY_DISABLE
;
2665 } else if (params
.sack_freq
> 1) {
2666 trans
->sackfreq
= params
.sack_freq
;
2667 trans
->param_flags
=
2668 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2669 SPP_SACKDELAY_ENABLE
;
2677 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2679 * Applications can specify protocol parameters for the default association
2680 * initialization. The option name argument to setsockopt() and getsockopt()
2683 * Setting initialization parameters is effective only on an unconnected
2684 * socket (for UDP-style sockets only future associations are effected
2685 * by the change). With TCP-style sockets, this option is inherited by
2686 * sockets derived from a listener socket.
2688 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2690 struct sctp_initmsg sinit
;
2691 struct sctp_sock
*sp
= sctp_sk(sk
);
2693 if (optlen
!= sizeof(struct sctp_initmsg
))
2695 if (copy_from_user(&sinit
, optval
, optlen
))
2698 if (sinit
.sinit_num_ostreams
)
2699 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2700 if (sinit
.sinit_max_instreams
)
2701 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2702 if (sinit
.sinit_max_attempts
)
2703 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2704 if (sinit
.sinit_max_init_timeo
)
2705 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2711 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2713 * Applications that wish to use the sendto() system call may wish to
2714 * specify a default set of parameters that would normally be supplied
2715 * through the inclusion of ancillary data. This socket option allows
2716 * such an application to set the default sctp_sndrcvinfo structure.
2717 * The application that wishes to use this socket option simply passes
2718 * in to this call the sctp_sndrcvinfo structure defined in Section
2719 * 5.2.2) The input parameters accepted by this call include
2720 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2721 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2722 * to this call if the caller is using the UDP model.
2724 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2725 char __user
*optval
,
2726 unsigned int optlen
)
2728 struct sctp_sndrcvinfo info
;
2729 struct sctp_association
*asoc
;
2730 struct sctp_sock
*sp
= sctp_sk(sk
);
2732 if (optlen
!= sizeof(struct sctp_sndrcvinfo
))
2734 if (copy_from_user(&info
, optval
, optlen
))
2737 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2738 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2742 asoc
->default_stream
= info
.sinfo_stream
;
2743 asoc
->default_flags
= info
.sinfo_flags
;
2744 asoc
->default_ppid
= info
.sinfo_ppid
;
2745 asoc
->default_context
= info
.sinfo_context
;
2746 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2748 sp
->default_stream
= info
.sinfo_stream
;
2749 sp
->default_flags
= info
.sinfo_flags
;
2750 sp
->default_ppid
= info
.sinfo_ppid
;
2751 sp
->default_context
= info
.sinfo_context
;
2752 sp
->default_timetolive
= info
.sinfo_timetolive
;
2758 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2760 * Requests that the local SCTP stack use the enclosed peer address as
2761 * the association primary. The enclosed address must be one of the
2762 * association peer's addresses.
2764 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2765 unsigned int optlen
)
2767 struct sctp_prim prim
;
2768 struct sctp_transport
*trans
;
2770 if (optlen
!= sizeof(struct sctp_prim
))
2773 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2776 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2780 sctp_assoc_set_primary(trans
->asoc
, trans
);
2786 * 7.1.5 SCTP_NODELAY
2788 * Turn on/off any Nagle-like algorithm. This means that packets are
2789 * generally sent as soon as possible and no unnecessary delays are
2790 * introduced, at the cost of more packets in the network. Expects an
2791 * integer boolean flag.
2793 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2794 unsigned int optlen
)
2798 if (optlen
< sizeof(int))
2800 if (get_user(val
, (int __user
*)optval
))
2803 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2809 * 7.1.1 SCTP_RTOINFO
2811 * The protocol parameters used to initialize and bound retransmission
2812 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2813 * and modify these parameters.
2814 * All parameters are time values, in milliseconds. A value of 0, when
2815 * modifying the parameters, indicates that the current value should not
2819 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2821 struct sctp_rtoinfo rtoinfo
;
2822 struct sctp_association
*asoc
;
2824 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2827 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2830 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2832 /* Set the values to the specific association */
2833 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2837 if (rtoinfo
.srto_initial
!= 0)
2839 msecs_to_jiffies(rtoinfo
.srto_initial
);
2840 if (rtoinfo
.srto_max
!= 0)
2841 asoc
->rto_max
= msecs_to_jiffies(rtoinfo
.srto_max
);
2842 if (rtoinfo
.srto_min
!= 0)
2843 asoc
->rto_min
= msecs_to_jiffies(rtoinfo
.srto_min
);
2845 /* If there is no association or the association-id = 0
2846 * set the values to the endpoint.
2848 struct sctp_sock
*sp
= sctp_sk(sk
);
2850 if (rtoinfo
.srto_initial
!= 0)
2851 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2852 if (rtoinfo
.srto_max
!= 0)
2853 sp
->rtoinfo
.srto_max
= rtoinfo
.srto_max
;
2854 if (rtoinfo
.srto_min
!= 0)
2855 sp
->rtoinfo
.srto_min
= rtoinfo
.srto_min
;
2863 * 7.1.2 SCTP_ASSOCINFO
2865 * This option is used to tune the maximum retransmission attempts
2866 * of the association.
2867 * Returns an error if the new association retransmission value is
2868 * greater than the sum of the retransmission value of the peer.
2869 * See [SCTP] for more information.
2872 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2875 struct sctp_assocparams assocparams
;
2876 struct sctp_association
*asoc
;
2878 if (optlen
!= sizeof(struct sctp_assocparams
))
2880 if (copy_from_user(&assocparams
, optval
, optlen
))
2883 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2885 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2888 /* Set the values to the specific association */
2890 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
2893 struct sctp_transport
*peer_addr
;
2895 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
2897 path_sum
+= peer_addr
->pathmaxrxt
;
2901 /* Only validate asocmaxrxt if we have more than
2902 * one path/transport. We do this because path
2903 * retransmissions are only counted when we have more
2907 assocparams
.sasoc_asocmaxrxt
> path_sum
)
2910 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
2913 if (assocparams
.sasoc_cookie_life
!= 0) {
2914 asoc
->cookie_life
.tv_sec
=
2915 assocparams
.sasoc_cookie_life
/ 1000;
2916 asoc
->cookie_life
.tv_usec
=
2917 (assocparams
.sasoc_cookie_life
% 1000)
2921 /* Set the values to the endpoint */
2922 struct sctp_sock
*sp
= sctp_sk(sk
);
2924 if (assocparams
.sasoc_asocmaxrxt
!= 0)
2925 sp
->assocparams
.sasoc_asocmaxrxt
=
2926 assocparams
.sasoc_asocmaxrxt
;
2927 if (assocparams
.sasoc_cookie_life
!= 0)
2928 sp
->assocparams
.sasoc_cookie_life
=
2929 assocparams
.sasoc_cookie_life
;
2935 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2937 * This socket option is a boolean flag which turns on or off mapped V4
2938 * addresses. If this option is turned on and the socket is type
2939 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2940 * If this option is turned off, then no mapping will be done of V4
2941 * addresses and a user will receive both PF_INET6 and PF_INET type
2942 * addresses on the socket.
2944 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2947 struct sctp_sock
*sp
= sctp_sk(sk
);
2949 if (optlen
< sizeof(int))
2951 if (get_user(val
, (int __user
*)optval
))
2962 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2963 * This option will get or set the maximum size to put in any outgoing
2964 * SCTP DATA chunk. If a message is larger than this size it will be
2965 * fragmented by SCTP into the specified size. Note that the underlying
2966 * SCTP implementation may fragment into smaller sized chunks when the
2967 * PMTU of the underlying association is smaller than the value set by
2968 * the user. The default value for this option is '0' which indicates
2969 * the user is NOT limiting fragmentation and only the PMTU will effect
2970 * SCTP's choice of DATA chunk size. Note also that values set larger
2971 * than the maximum size of an IP datagram will effectively let SCTP
2972 * control fragmentation (i.e. the same as setting this option to 0).
2974 * The following structure is used to access and modify this parameter:
2976 * struct sctp_assoc_value {
2977 * sctp_assoc_t assoc_id;
2978 * uint32_t assoc_value;
2981 * assoc_id: This parameter is ignored for one-to-one style sockets.
2982 * For one-to-many style sockets this parameter indicates which
2983 * association the user is performing an action upon. Note that if
2984 * this field's value is zero then the endpoints default value is
2985 * changed (effecting future associations only).
2986 * assoc_value: This parameter specifies the maximum size in bytes.
2988 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2990 struct sctp_assoc_value params
;
2991 struct sctp_association
*asoc
;
2992 struct sctp_sock
*sp
= sctp_sk(sk
);
2995 if (optlen
== sizeof(int)) {
2996 pr_warn("Use of int in maxseg socket option deprecated\n");
2997 pr_warn("Use struct sctp_assoc_value instead\n");
2998 if (copy_from_user(&val
, optval
, optlen
))
3000 params
.assoc_id
= 0;
3001 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3002 if (copy_from_user(¶ms
, optval
, optlen
))
3004 val
= params
.assoc_value
;
3008 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
3011 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3012 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
3017 val
= asoc
->pathmtu
;
3018 val
-= sp
->pf
->af
->net_header_len
;
3019 val
-= sizeof(struct sctphdr
) +
3020 sizeof(struct sctp_data_chunk
);
3022 asoc
->user_frag
= val
;
3023 asoc
->frag_point
= sctp_frag_point(asoc
, asoc
->pathmtu
);
3025 sp
->user_frag
= val
;
3033 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3035 * Requests that the peer mark the enclosed address as the association
3036 * primary. The enclosed address must be one of the association's
3037 * locally bound addresses. The following structure is used to make a
3038 * set primary request:
3040 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
3041 unsigned int optlen
)
3043 struct net
*net
= sock_net(sk
);
3044 struct sctp_sock
*sp
;
3045 struct sctp_association
*asoc
= NULL
;
3046 struct sctp_setpeerprim prim
;
3047 struct sctp_chunk
*chunk
;
3053 if (!net
->sctp
.addip_enable
)
3056 if (optlen
!= sizeof(struct sctp_setpeerprim
))
3059 if (copy_from_user(&prim
, optval
, optlen
))
3062 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
3066 if (!asoc
->peer
.asconf_capable
)
3069 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
3072 if (!sctp_state(asoc
, ESTABLISHED
))
3075 af
= sctp_get_af_specific(prim
.sspp_addr
.ss_family
);
3079 if (!af
->addr_valid((union sctp_addr
*)&prim
.sspp_addr
, sp
, NULL
))
3080 return -EADDRNOTAVAIL
;
3082 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
3083 return -EADDRNOTAVAIL
;
3085 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3086 chunk
= sctp_make_asconf_set_prim(asoc
,
3087 (union sctp_addr
*)&prim
.sspp_addr
);
3091 err
= sctp_send_asconf(asoc
, chunk
);
3093 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
3098 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
3099 unsigned int optlen
)
3101 struct sctp_setadaptation adaptation
;
3103 if (optlen
!= sizeof(struct sctp_setadaptation
))
3105 if (copy_from_user(&adaptation
, optval
, optlen
))
3108 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
3114 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3116 * The context field in the sctp_sndrcvinfo structure is normally only
3117 * used when a failed message is retrieved holding the value that was
3118 * sent down on the actual send call. This option allows the setting of
3119 * a default context on an association basis that will be received on
3120 * reading messages from the peer. This is especially helpful in the
3121 * one-2-many model for an application to keep some reference to an
3122 * internal state machine that is processing messages on the
3123 * association. Note that the setting of this value only effects
3124 * received messages from the peer and does not effect the value that is
3125 * saved with outbound messages.
3127 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
3128 unsigned int optlen
)
3130 struct sctp_assoc_value params
;
3131 struct sctp_sock
*sp
;
3132 struct sctp_association
*asoc
;
3134 if (optlen
!= sizeof(struct sctp_assoc_value
))
3136 if (copy_from_user(¶ms
, optval
, optlen
))
3141 if (params
.assoc_id
!= 0) {
3142 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3145 asoc
->default_rcv_context
= params
.assoc_value
;
3147 sp
->default_rcv_context
= params
.assoc_value
;
3154 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3156 * This options will at a minimum specify if the implementation is doing
3157 * fragmented interleave. Fragmented interleave, for a one to many
3158 * socket, is when subsequent calls to receive a message may return
3159 * parts of messages from different associations. Some implementations
3160 * may allow you to turn this value on or off. If so, when turned off,
3161 * no fragment interleave will occur (which will cause a head of line
3162 * blocking amongst multiple associations sharing the same one to many
3163 * socket). When this option is turned on, then each receive call may
3164 * come from a different association (thus the user must receive data
3165 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3166 * association each receive belongs to.
3168 * This option takes a boolean value. A non-zero value indicates that
3169 * fragmented interleave is on. A value of zero indicates that
3170 * fragmented interleave is off.
3172 * Note that it is important that an implementation that allows this
3173 * option to be turned on, have it off by default. Otherwise an unaware
3174 * application using the one to many model may become confused and act
3177 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
3178 char __user
*optval
,
3179 unsigned int optlen
)
3183 if (optlen
!= sizeof(int))
3185 if (get_user(val
, (int __user
*)optval
))
3188 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
3194 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3195 * (SCTP_PARTIAL_DELIVERY_POINT)
3197 * This option will set or get the SCTP partial delivery point. This
3198 * point is the size of a message where the partial delivery API will be
3199 * invoked to help free up rwnd space for the peer. Setting this to a
3200 * lower value will cause partial deliveries to happen more often. The
3201 * calls argument is an integer that sets or gets the partial delivery
3202 * point. Note also that the call will fail if the user attempts to set
3203 * this value larger than the socket receive buffer size.
3205 * Note that any single message having a length smaller than or equal to
3206 * the SCTP partial delivery point will be delivered in one single read
3207 * call as long as the user provided buffer is large enough to hold the
3210 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
3211 char __user
*optval
,
3212 unsigned int optlen
)
3216 if (optlen
!= sizeof(u32
))
3218 if (get_user(val
, (int __user
*)optval
))
3221 /* Note: We double the receive buffer from what the user sets
3222 * it to be, also initial rwnd is based on rcvbuf/2.
3224 if (val
> (sk
->sk_rcvbuf
>> 1))
3227 sctp_sk(sk
)->pd_point
= val
;
3229 return 0; /* is this the right error code? */
3233 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3235 * This option will allow a user to change the maximum burst of packets
3236 * that can be emitted by this association. Note that the default value
3237 * is 4, and some implementations may restrict this setting so that it
3238 * can only be lowered.
3240 * NOTE: This text doesn't seem right. Do this on a socket basis with
3241 * future associations inheriting the socket value.
3243 static int sctp_setsockopt_maxburst(struct sock
*sk
,
3244 char __user
*optval
,
3245 unsigned int optlen
)
3247 struct sctp_assoc_value params
;
3248 struct sctp_sock
*sp
;
3249 struct sctp_association
*asoc
;
3253 if (optlen
== sizeof(int)) {
3254 pr_warn("Use of int in max_burst socket option deprecated\n");
3255 pr_warn("Use struct sctp_assoc_value instead\n");
3256 if (copy_from_user(&val
, optval
, optlen
))
3258 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3259 if (copy_from_user(¶ms
, optval
, optlen
))
3261 val
= params
.assoc_value
;
3262 assoc_id
= params
.assoc_id
;
3268 if (assoc_id
!= 0) {
3269 asoc
= sctp_id2assoc(sk
, assoc_id
);
3272 asoc
->max_burst
= val
;
3274 sp
->max_burst
= val
;
3280 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3282 * This set option adds a chunk type that the user is requesting to be
3283 * received only in an authenticated way. Changes to the list of chunks
3284 * will only effect future associations on the socket.
3286 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
3287 char __user
*optval
,
3288 unsigned int optlen
)
3290 struct net
*net
= sock_net(sk
);
3291 struct sctp_authchunk val
;
3293 if (!net
->sctp
.auth_enable
)
3296 if (optlen
!= sizeof(struct sctp_authchunk
))
3298 if (copy_from_user(&val
, optval
, optlen
))
3301 switch (val
.sauth_chunk
) {
3303 case SCTP_CID_INIT_ACK
:
3304 case SCTP_CID_SHUTDOWN_COMPLETE
:
3309 /* add this chunk id to the endpoint */
3310 return sctp_auth_ep_add_chunkid(sctp_sk(sk
)->ep
, val
.sauth_chunk
);
3314 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3316 * This option gets or sets the list of HMAC algorithms that the local
3317 * endpoint requires the peer to use.
3319 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
3320 char __user
*optval
,
3321 unsigned int optlen
)
3323 struct net
*net
= sock_net(sk
);
3324 struct sctp_hmacalgo
*hmacs
;
3328 if (!net
->sctp
.auth_enable
)
3331 if (optlen
< sizeof(struct sctp_hmacalgo
))
3334 hmacs
= memdup_user(optval
, optlen
);
3336 return PTR_ERR(hmacs
);
3338 idents
= hmacs
->shmac_num_idents
;
3339 if (idents
== 0 || idents
> SCTP_AUTH_NUM_HMACS
||
3340 (idents
* sizeof(u16
)) > (optlen
- sizeof(struct sctp_hmacalgo
))) {
3345 err
= sctp_auth_ep_set_hmacs(sctp_sk(sk
)->ep
, hmacs
);
3352 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3354 * This option will set a shared secret key which is used to build an
3355 * association shared key.
3357 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3358 char __user
*optval
,
3359 unsigned int optlen
)
3361 struct net
*net
= sock_net(sk
);
3362 struct sctp_authkey
*authkey
;
3363 struct sctp_association
*asoc
;
3366 if (!net
->sctp
.auth_enable
)
3369 if (optlen
<= sizeof(struct sctp_authkey
))
3372 authkey
= memdup_user(optval
, optlen
);
3373 if (IS_ERR(authkey
))
3374 return PTR_ERR(authkey
);
3376 if (authkey
->sca_keylength
> optlen
- sizeof(struct sctp_authkey
)) {
3381 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3382 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3387 ret
= sctp_auth_set_key(sctp_sk(sk
)->ep
, asoc
, authkey
);
3394 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3396 * This option will get or set the active shared key to be used to build
3397 * the association shared key.
3399 static int sctp_setsockopt_active_key(struct sock
*sk
,
3400 char __user
*optval
,
3401 unsigned int optlen
)
3403 struct net
*net
= sock_net(sk
);
3404 struct sctp_authkeyid val
;
3405 struct sctp_association
*asoc
;
3407 if (!net
->sctp
.auth_enable
)
3410 if (optlen
!= sizeof(struct sctp_authkeyid
))
3412 if (copy_from_user(&val
, optval
, optlen
))
3415 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3416 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3419 return sctp_auth_set_active_key(sctp_sk(sk
)->ep
, asoc
,
3420 val
.scact_keynumber
);
3424 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3426 * This set option will delete a shared secret key from use.
3428 static int sctp_setsockopt_del_key(struct sock
*sk
,
3429 char __user
*optval
,
3430 unsigned int optlen
)
3432 struct net
*net
= sock_net(sk
);
3433 struct sctp_authkeyid val
;
3434 struct sctp_association
*asoc
;
3436 if (!net
->sctp
.auth_enable
)
3439 if (optlen
!= sizeof(struct sctp_authkeyid
))
3441 if (copy_from_user(&val
, optval
, optlen
))
3444 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3445 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3448 return sctp_auth_del_key_id(sctp_sk(sk
)->ep
, asoc
,
3449 val
.scact_keynumber
);
3454 * 8.1.23 SCTP_AUTO_ASCONF
3456 * This option will enable or disable the use of the automatic generation of
3457 * ASCONF chunks to add and delete addresses to an existing association. Note
3458 * that this option has two caveats namely: a) it only affects sockets that
3459 * are bound to all addresses available to the SCTP stack, and b) the system
3460 * administrator may have an overriding control that turns the ASCONF feature
3461 * off no matter what setting the socket option may have.
3462 * This option expects an integer boolean flag, where a non-zero value turns on
3463 * the option, and a zero value turns off the option.
3464 * Note. In this implementation, socket operation overrides default parameter
3465 * being set by sysctl as well as FreeBSD implementation
3467 static int sctp_setsockopt_auto_asconf(struct sock
*sk
, char __user
*optval
,
3468 unsigned int optlen
)
3471 struct sctp_sock
*sp
= sctp_sk(sk
);
3473 if (optlen
< sizeof(int))
3475 if (get_user(val
, (int __user
*)optval
))
3477 if (!sctp_is_ep_boundall(sk
) && val
)
3479 if ((val
&& sp
->do_auto_asconf
) || (!val
&& !sp
->do_auto_asconf
))
3482 if (val
== 0 && sp
->do_auto_asconf
) {
3483 list_del(&sp
->auto_asconf_list
);
3484 sp
->do_auto_asconf
= 0;
3485 } else if (val
&& !sp
->do_auto_asconf
) {
3486 list_add_tail(&sp
->auto_asconf_list
,
3487 &sock_net(sk
)->sctp
.auto_asconf_splist
);
3488 sp
->do_auto_asconf
= 1;
3495 * SCTP_PEER_ADDR_THLDS
3497 * This option allows us to alter the partially failed threshold for one or all
3498 * transports in an association. See Section 6.1 of:
3499 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3501 static int sctp_setsockopt_paddr_thresholds(struct sock
*sk
,
3502 char __user
*optval
,
3503 unsigned int optlen
)
3505 struct sctp_paddrthlds val
;
3506 struct sctp_transport
*trans
;
3507 struct sctp_association
*asoc
;
3509 if (optlen
< sizeof(struct sctp_paddrthlds
))
3511 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
,
3512 sizeof(struct sctp_paddrthlds
)))
3516 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
3517 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
3520 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
3522 if (val
.spt_pathmaxrxt
)
3523 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3524 trans
->pf_retrans
= val
.spt_pathpfthld
;
3527 if (val
.spt_pathmaxrxt
)
3528 asoc
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3529 asoc
->pf_retrans
= val
.spt_pathpfthld
;
3531 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
3536 if (val
.spt_pathmaxrxt
)
3537 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3538 trans
->pf_retrans
= val
.spt_pathpfthld
;
3544 /* API 6.2 setsockopt(), getsockopt()
3546 * Applications use setsockopt() and getsockopt() to set or retrieve
3547 * socket options. Socket options are used to change the default
3548 * behavior of sockets calls. They are described in Section 7.
3552 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3553 * int __user *optlen);
3554 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3557 * sd - the socket descript.
3558 * level - set to IPPROTO_SCTP for all SCTP options.
3559 * optname - the option name.
3560 * optval - the buffer to store the value of the option.
3561 * optlen - the size of the buffer.
3563 static int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3564 char __user
*optval
, unsigned int optlen
)
3568 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3571 /* I can hardly begin to describe how wrong this is. This is
3572 * so broken as to be worse than useless. The API draft
3573 * REALLY is NOT helpful here... I am not convinced that the
3574 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3575 * are at all well-founded.
3577 if (level
!= SOL_SCTP
) {
3578 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3579 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3586 case SCTP_SOCKOPT_BINDX_ADD
:
3587 /* 'optlen' is the size of the addresses buffer. */
3588 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3589 optlen
, SCTP_BINDX_ADD_ADDR
);
3592 case SCTP_SOCKOPT_BINDX_REM
:
3593 /* 'optlen' is the size of the addresses buffer. */
3594 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3595 optlen
, SCTP_BINDX_REM_ADDR
);
3598 case SCTP_SOCKOPT_CONNECTX_OLD
:
3599 /* 'optlen' is the size of the addresses buffer. */
3600 retval
= sctp_setsockopt_connectx_old(sk
,
3601 (struct sockaddr __user
*)optval
,
3605 case SCTP_SOCKOPT_CONNECTX
:
3606 /* 'optlen' is the size of the addresses buffer. */
3607 retval
= sctp_setsockopt_connectx(sk
,
3608 (struct sockaddr __user
*)optval
,
3612 case SCTP_DISABLE_FRAGMENTS
:
3613 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3617 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3620 case SCTP_AUTOCLOSE
:
3621 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3624 case SCTP_PEER_ADDR_PARAMS
:
3625 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3628 case SCTP_DELAYED_SACK
:
3629 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3631 case SCTP_PARTIAL_DELIVERY_POINT
:
3632 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3636 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3638 case SCTP_DEFAULT_SEND_PARAM
:
3639 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3642 case SCTP_PRIMARY_ADDR
:
3643 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3645 case SCTP_SET_PEER_PRIMARY_ADDR
:
3646 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3649 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3652 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3654 case SCTP_ASSOCINFO
:
3655 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3657 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3658 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3661 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3663 case SCTP_ADAPTATION_LAYER
:
3664 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3667 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3669 case SCTP_FRAGMENT_INTERLEAVE
:
3670 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3672 case SCTP_MAX_BURST
:
3673 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3675 case SCTP_AUTH_CHUNK
:
3676 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3678 case SCTP_HMAC_IDENT
:
3679 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3682 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3684 case SCTP_AUTH_ACTIVE_KEY
:
3685 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3687 case SCTP_AUTH_DELETE_KEY
:
3688 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3690 case SCTP_AUTO_ASCONF
:
3691 retval
= sctp_setsockopt_auto_asconf(sk
, optval
, optlen
);
3693 case SCTP_PEER_ADDR_THLDS
:
3694 retval
= sctp_setsockopt_paddr_thresholds(sk
, optval
, optlen
);
3697 retval
= -ENOPROTOOPT
;
3701 sctp_release_sock(sk
);
3707 /* API 3.1.6 connect() - UDP Style Syntax
3709 * An application may use the connect() call in the UDP model to initiate an
3710 * association without sending data.
3714 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3716 * sd: the socket descriptor to have a new association added to.
3718 * nam: the address structure (either struct sockaddr_in or struct
3719 * sockaddr_in6 defined in RFC2553 [7]).
3721 * len: the size of the address.
3723 static int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
3731 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3732 __func__
, sk
, addr
, addr_len
);
3734 /* Validate addr_len before calling common connect/connectx routine. */
3735 af
= sctp_get_af_specific(addr
->sa_family
);
3736 if (!af
|| addr_len
< af
->sockaddr_len
) {
3739 /* Pass correct addr len to common routine (so it knows there
3740 * is only one address being passed.
3742 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
3745 sctp_release_sock(sk
);
3749 /* FIXME: Write comments. */
3750 static int sctp_disconnect(struct sock
*sk
, int flags
)
3752 return -EOPNOTSUPP
; /* STUB */
3755 /* 4.1.4 accept() - TCP Style Syntax
3757 * Applications use accept() call to remove an established SCTP
3758 * association from the accept queue of the endpoint. A new socket
3759 * descriptor will be returned from accept() to represent the newly
3760 * formed association.
3762 static struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
3764 struct sctp_sock
*sp
;
3765 struct sctp_endpoint
*ep
;
3766 struct sock
*newsk
= NULL
;
3767 struct sctp_association
*asoc
;
3776 if (!sctp_style(sk
, TCP
)) {
3777 error
= -EOPNOTSUPP
;
3781 if (!sctp_sstate(sk
, LISTENING
)) {
3786 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
3788 error
= sctp_wait_for_accept(sk
, timeo
);
3792 /* We treat the list of associations on the endpoint as the accept
3793 * queue and pick the first association on the list.
3795 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
3797 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
3803 /* Populate the fields of the newsk from the oldsk and migrate the
3804 * asoc to the newsk.
3806 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
3809 sctp_release_sock(sk
);
3814 /* The SCTP ioctl handler. */
3815 static int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
3822 * SEQPACKET-style sockets in LISTENING state are valid, for
3823 * SCTP, so only discard TCP-style sockets in LISTENING state.
3825 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
3830 struct sk_buff
*skb
;
3831 unsigned int amount
= 0;
3833 skb
= skb_peek(&sk
->sk_receive_queue
);
3836 * We will only return the amount of this packet since
3837 * that is all that will be read.
3841 rc
= put_user(amount
, (int __user
*)arg
);
3849 sctp_release_sock(sk
);
3853 /* This is the function which gets called during socket creation to
3854 * initialized the SCTP-specific portion of the sock.
3855 * The sock structure should already be zero-filled memory.
3857 static int sctp_init_sock(struct sock
*sk
)
3859 struct net
*net
= sock_net(sk
);
3860 struct sctp_sock
*sp
;
3862 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk
);
3866 /* Initialize the SCTP per socket area. */
3867 switch (sk
->sk_type
) {
3868 case SOCK_SEQPACKET
:
3869 sp
->type
= SCTP_SOCKET_UDP
;
3872 sp
->type
= SCTP_SOCKET_TCP
;
3875 return -ESOCKTNOSUPPORT
;
3878 /* Initialize default send parameters. These parameters can be
3879 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3881 sp
->default_stream
= 0;
3882 sp
->default_ppid
= 0;
3883 sp
->default_flags
= 0;
3884 sp
->default_context
= 0;
3885 sp
->default_timetolive
= 0;
3887 sp
->default_rcv_context
= 0;
3888 sp
->max_burst
= net
->sctp
.max_burst
;
3890 sp
->sctp_hmac_alg
= net
->sctp
.sctp_hmac_alg
;
3892 /* Initialize default setup parameters. These parameters
3893 * can be modified with the SCTP_INITMSG socket option or
3894 * overridden by the SCTP_INIT CMSG.
3896 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
3897 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
3898 sp
->initmsg
.sinit_max_attempts
= net
->sctp
.max_retrans_init
;
3899 sp
->initmsg
.sinit_max_init_timeo
= net
->sctp
.rto_max
;
3901 /* Initialize default RTO related parameters. These parameters can
3902 * be modified for with the SCTP_RTOINFO socket option.
3904 sp
->rtoinfo
.srto_initial
= net
->sctp
.rto_initial
;
3905 sp
->rtoinfo
.srto_max
= net
->sctp
.rto_max
;
3906 sp
->rtoinfo
.srto_min
= net
->sctp
.rto_min
;
3908 /* Initialize default association related parameters. These parameters
3909 * can be modified with the SCTP_ASSOCINFO socket option.
3911 sp
->assocparams
.sasoc_asocmaxrxt
= net
->sctp
.max_retrans_association
;
3912 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
3913 sp
->assocparams
.sasoc_peer_rwnd
= 0;
3914 sp
->assocparams
.sasoc_local_rwnd
= 0;
3915 sp
->assocparams
.sasoc_cookie_life
= net
->sctp
.valid_cookie_life
;
3917 /* Initialize default event subscriptions. By default, all the
3920 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
3922 /* Default Peer Address Parameters. These defaults can
3923 * be modified via SCTP_PEER_ADDR_PARAMS
3925 sp
->hbinterval
= net
->sctp
.hb_interval
;
3926 sp
->pathmaxrxt
= net
->sctp
.max_retrans_path
;
3927 sp
->pathmtu
= 0; // allow default discovery
3928 sp
->sackdelay
= net
->sctp
.sack_timeout
;
3930 sp
->param_flags
= SPP_HB_ENABLE
|
3932 SPP_SACKDELAY_ENABLE
;
3934 /* If enabled no SCTP message fragmentation will be performed.
3935 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3937 sp
->disable_fragments
= 0;
3939 /* Enable Nagle algorithm by default. */
3942 /* Enable by default. */
3945 /* Auto-close idle associations after the configured
3946 * number of seconds. A value of 0 disables this
3947 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3948 * for UDP-style sockets only.
3952 /* User specified fragmentation limit. */
3955 sp
->adaptation_ind
= 0;
3957 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
3959 /* Control variables for partial data delivery. */
3960 atomic_set(&sp
->pd_mode
, 0);
3961 skb_queue_head_init(&sp
->pd_lobby
);
3962 sp
->frag_interleave
= 0;
3964 /* Create a per socket endpoint structure. Even if we
3965 * change the data structure relationships, this may still
3966 * be useful for storing pre-connect address information.
3968 sp
->ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
3974 SCTP_DBG_OBJCNT_INC(sock
);
3977 percpu_counter_inc(&sctp_sockets_allocated
);
3978 sock_prot_inuse_add(net
, sk
->sk_prot
, 1);
3979 if (net
->sctp
.default_auto_asconf
) {
3980 list_add_tail(&sp
->auto_asconf_list
,
3981 &net
->sctp
.auto_asconf_splist
);
3982 sp
->do_auto_asconf
= 1;
3984 sp
->do_auto_asconf
= 0;
3990 /* Cleanup any SCTP per socket resources. */
3991 static void sctp_destroy_sock(struct sock
*sk
)
3993 struct sctp_sock
*sp
;
3995 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk
);
3997 /* Release our hold on the endpoint. */
3999 /* This could happen during socket init, thus we bail out
4000 * early, since the rest of the below is not setup either.
4005 if (sp
->do_auto_asconf
) {
4006 sp
->do_auto_asconf
= 0;
4007 list_del(&sp
->auto_asconf_list
);
4009 sctp_endpoint_free(sp
->ep
);
4011 percpu_counter_dec(&sctp_sockets_allocated
);
4012 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
4016 /* API 4.1.7 shutdown() - TCP Style Syntax
4017 * int shutdown(int socket, int how);
4019 * sd - the socket descriptor of the association to be closed.
4020 * how - Specifies the type of shutdown. The values are
4023 * Disables further receive operations. No SCTP
4024 * protocol action is taken.
4026 * Disables further send operations, and initiates
4027 * the SCTP shutdown sequence.
4029 * Disables further send and receive operations
4030 * and initiates the SCTP shutdown sequence.
4032 static void sctp_shutdown(struct sock
*sk
, int how
)
4034 struct net
*net
= sock_net(sk
);
4035 struct sctp_endpoint
*ep
;
4036 struct sctp_association
*asoc
;
4038 if (!sctp_style(sk
, TCP
))
4041 if (how
& SEND_SHUTDOWN
) {
4042 ep
= sctp_sk(sk
)->ep
;
4043 if (!list_empty(&ep
->asocs
)) {
4044 asoc
= list_entry(ep
->asocs
.next
,
4045 struct sctp_association
, asocs
);
4046 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
4051 /* 7.2.1 Association Status (SCTP_STATUS)
4053 * Applications can retrieve current status information about an
4054 * association, including association state, peer receiver window size,
4055 * number of unacked data chunks, and number of data chunks pending
4056 * receipt. This information is read-only.
4058 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
4059 char __user
*optval
,
4062 struct sctp_status status
;
4063 struct sctp_association
*asoc
= NULL
;
4064 struct sctp_transport
*transport
;
4065 sctp_assoc_t associd
;
4068 if (len
< sizeof(status
)) {
4073 len
= sizeof(status
);
4074 if (copy_from_user(&status
, optval
, len
)) {
4079 associd
= status
.sstat_assoc_id
;
4080 asoc
= sctp_id2assoc(sk
, associd
);
4086 transport
= asoc
->peer
.primary_path
;
4088 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
4089 status
.sstat_state
= asoc
->state
;
4090 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
4091 status
.sstat_unackdata
= asoc
->unack_data
;
4093 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4094 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
4095 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
4096 status
.sstat_fragmentation_point
= asoc
->frag_point
;
4097 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4098 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
4099 transport
->af_specific
->sockaddr_len
);
4100 /* Map ipv4 address into v4-mapped-on-v6 address. */
4101 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4102 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
4103 status
.sstat_primary
.spinfo_state
= transport
->state
;
4104 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
4105 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
4106 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4107 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
4109 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
4110 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
4112 if (put_user(len
, optlen
)) {
4117 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
4118 len
, status
.sstat_state
, status
.sstat_rwnd
,
4119 status
.sstat_assoc_id
);
4121 if (copy_to_user(optval
, &status
, len
)) {
4131 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4133 * Applications can retrieve information about a specific peer address
4134 * of an association, including its reachability state, congestion
4135 * window, and retransmission timer values. This information is
4138 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
4139 char __user
*optval
,
4142 struct sctp_paddrinfo pinfo
;
4143 struct sctp_transport
*transport
;
4146 if (len
< sizeof(pinfo
)) {
4151 len
= sizeof(pinfo
);
4152 if (copy_from_user(&pinfo
, optval
, len
)) {
4157 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
4158 pinfo
.spinfo_assoc_id
);
4162 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4163 pinfo
.spinfo_state
= transport
->state
;
4164 pinfo
.spinfo_cwnd
= transport
->cwnd
;
4165 pinfo
.spinfo_srtt
= transport
->srtt
;
4166 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4167 pinfo
.spinfo_mtu
= transport
->pathmtu
;
4169 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
4170 pinfo
.spinfo_state
= SCTP_ACTIVE
;
4172 if (put_user(len
, optlen
)) {
4177 if (copy_to_user(optval
, &pinfo
, len
)) {
4186 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4188 * This option is a on/off flag. If enabled no SCTP message
4189 * fragmentation will be performed. Instead if a message being sent
4190 * exceeds the current PMTU size, the message will NOT be sent and
4191 * instead a error will be indicated to the user.
4193 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
4194 char __user
*optval
, int __user
*optlen
)
4198 if (len
< sizeof(int))
4202 val
= (sctp_sk(sk
)->disable_fragments
== 1);
4203 if (put_user(len
, optlen
))
4205 if (copy_to_user(optval
, &val
, len
))
4210 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4212 * This socket option is used to specify various notifications and
4213 * ancillary data the user wishes to receive.
4215 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
4220 if (len
> sizeof(struct sctp_event_subscribe
))
4221 len
= sizeof(struct sctp_event_subscribe
);
4222 if (put_user(len
, optlen
))
4224 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
4229 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4231 * This socket option is applicable to the UDP-style socket only. When
4232 * set it will cause associations that are idle for more than the
4233 * specified number of seconds to automatically close. An association
4234 * being idle is defined an association that has NOT sent or received
4235 * user data. The special value of '0' indicates that no automatic
4236 * close of any associations should be performed. The option expects an
4237 * integer defining the number of seconds of idle time before an
4238 * association is closed.
4240 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4242 /* Applicable to UDP-style socket only */
4243 if (sctp_style(sk
, TCP
))
4245 if (len
< sizeof(int))
4248 if (put_user(len
, optlen
))
4250 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
4255 /* Helper routine to branch off an association to a new socket. */
4256 int sctp_do_peeloff(struct sock
*sk
, sctp_assoc_t id
, struct socket
**sockp
)
4258 struct sctp_association
*asoc
= sctp_id2assoc(sk
, id
);
4259 struct socket
*sock
;
4266 /* An association cannot be branched off from an already peeled-off
4267 * socket, nor is this supported for tcp style sockets.
4269 if (!sctp_style(sk
, UDP
))
4272 /* Create a new socket. */
4273 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
4277 sctp_copy_sock(sock
->sk
, sk
, asoc
);
4279 /* Make peeled-off sockets more like 1-1 accepted sockets.
4280 * Set the daddr and initialize id to something more random
4282 af
= sctp_get_af_specific(asoc
->peer
.primary_addr
.sa
.sa_family
);
4283 af
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
4285 /* Populate the fields of the newsk from the oldsk and migrate the
4286 * asoc to the newsk.
4288 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
4294 EXPORT_SYMBOL(sctp_do_peeloff
);
4296 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4298 sctp_peeloff_arg_t peeloff
;
4299 struct socket
*newsock
;
4300 struct file
*newfile
;
4303 if (len
< sizeof(sctp_peeloff_arg_t
))
4305 len
= sizeof(sctp_peeloff_arg_t
);
4306 if (copy_from_user(&peeloff
, optval
, len
))
4309 retval
= sctp_do_peeloff(sk
, peeloff
.associd
, &newsock
);
4313 /* Map the socket to an unused fd that can be returned to the user. */
4314 retval
= get_unused_fd();
4316 sock_release(newsock
);
4320 newfile
= sock_alloc_file(newsock
, 0, NULL
);
4321 if (unlikely(IS_ERR(newfile
))) {
4322 put_unused_fd(retval
);
4323 sock_release(newsock
);
4324 return PTR_ERR(newfile
);
4327 SCTP_DEBUG_PRINTK("%s: sk: %p newsk: %p sd: %d\n",
4328 __func__
, sk
, newsock
->sk
, retval
);
4330 /* Return the fd mapped to the new socket. */
4331 if (put_user(len
, optlen
)) {
4333 put_unused_fd(retval
);
4336 peeloff
.sd
= retval
;
4337 if (copy_to_user(optval
, &peeloff
, len
)) {
4339 put_unused_fd(retval
);
4342 fd_install(retval
, newfile
);
4347 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4349 * Applications can enable or disable heartbeats for any peer address of
4350 * an association, modify an address's heartbeat interval, force a
4351 * heartbeat to be sent immediately, and adjust the address's maximum
4352 * number of retransmissions sent before an address is considered
4353 * unreachable. The following structure is used to access and modify an
4354 * address's parameters:
4356 * struct sctp_paddrparams {
4357 * sctp_assoc_t spp_assoc_id;
4358 * struct sockaddr_storage spp_address;
4359 * uint32_t spp_hbinterval;
4360 * uint16_t spp_pathmaxrxt;
4361 * uint32_t spp_pathmtu;
4362 * uint32_t spp_sackdelay;
4363 * uint32_t spp_flags;
4366 * spp_assoc_id - (one-to-many style socket) This is filled in the
4367 * application, and identifies the association for
4369 * spp_address - This specifies which address is of interest.
4370 * spp_hbinterval - This contains the value of the heartbeat interval,
4371 * in milliseconds. If a value of zero
4372 * is present in this field then no changes are to
4373 * be made to this parameter.
4374 * spp_pathmaxrxt - This contains the maximum number of
4375 * retransmissions before this address shall be
4376 * considered unreachable. If a value of zero
4377 * is present in this field then no changes are to
4378 * be made to this parameter.
4379 * spp_pathmtu - When Path MTU discovery is disabled the value
4380 * specified here will be the "fixed" path mtu.
4381 * Note that if the spp_address field is empty
4382 * then all associations on this address will
4383 * have this fixed path mtu set upon them.
4385 * spp_sackdelay - When delayed sack is enabled, this value specifies
4386 * the number of milliseconds that sacks will be delayed
4387 * for. This value will apply to all addresses of an
4388 * association if the spp_address field is empty. Note
4389 * also, that if delayed sack is enabled and this
4390 * value is set to 0, no change is made to the last
4391 * recorded delayed sack timer value.
4393 * spp_flags - These flags are used to control various features
4394 * on an association. The flag field may contain
4395 * zero or more of the following options.
4397 * SPP_HB_ENABLE - Enable heartbeats on the
4398 * specified address. Note that if the address
4399 * field is empty all addresses for the association
4400 * have heartbeats enabled upon them.
4402 * SPP_HB_DISABLE - Disable heartbeats on the
4403 * speicifed address. Note that if the address
4404 * field is empty all addresses for the association
4405 * will have their heartbeats disabled. Note also
4406 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4407 * mutually exclusive, only one of these two should
4408 * be specified. Enabling both fields will have
4409 * undetermined results.
4411 * SPP_HB_DEMAND - Request a user initiated heartbeat
4412 * to be made immediately.
4414 * SPP_PMTUD_ENABLE - This field will enable PMTU
4415 * discovery upon the specified address. Note that
4416 * if the address feild is empty then all addresses
4417 * on the association are effected.
4419 * SPP_PMTUD_DISABLE - This field will disable PMTU
4420 * discovery upon the specified address. Note that
4421 * if the address feild is empty then all addresses
4422 * on the association are effected. Not also that
4423 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4424 * exclusive. Enabling both will have undetermined
4427 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4428 * on delayed sack. The time specified in spp_sackdelay
4429 * is used to specify the sack delay for this address. Note
4430 * that if spp_address is empty then all addresses will
4431 * enable delayed sack and take on the sack delay
4432 * value specified in spp_sackdelay.
4433 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4434 * off delayed sack. If the spp_address field is blank then
4435 * delayed sack is disabled for the entire association. Note
4436 * also that this field is mutually exclusive to
4437 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4440 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
4441 char __user
*optval
, int __user
*optlen
)
4443 struct sctp_paddrparams params
;
4444 struct sctp_transport
*trans
= NULL
;
4445 struct sctp_association
*asoc
= NULL
;
4446 struct sctp_sock
*sp
= sctp_sk(sk
);
4448 if (len
< sizeof(struct sctp_paddrparams
))
4450 len
= sizeof(struct sctp_paddrparams
);
4451 if (copy_from_user(¶ms
, optval
, len
))
4454 /* If an address other than INADDR_ANY is specified, and
4455 * no transport is found, then the request is invalid.
4457 if (!sctp_is_any(sk
, ( union sctp_addr
*)¶ms
.spp_address
)) {
4458 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
4459 params
.spp_assoc_id
);
4461 SCTP_DEBUG_PRINTK("Failed no transport\n");
4466 /* Get association, if assoc_id != 0 and the socket is a one
4467 * to many style socket, and an association was not found, then
4468 * the id was invalid.
4470 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
4471 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
4472 SCTP_DEBUG_PRINTK("Failed no association\n");
4477 /* Fetch transport values. */
4478 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
4479 params
.spp_pathmtu
= trans
->pathmtu
;
4480 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
4481 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
4483 /*draft-11 doesn't say what to return in spp_flags*/
4484 params
.spp_flags
= trans
->param_flags
;
4486 /* Fetch association values. */
4487 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
4488 params
.spp_pathmtu
= asoc
->pathmtu
;
4489 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
4490 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
4492 /*draft-11 doesn't say what to return in spp_flags*/
4493 params
.spp_flags
= asoc
->param_flags
;
4495 /* Fetch socket values. */
4496 params
.spp_hbinterval
= sp
->hbinterval
;
4497 params
.spp_pathmtu
= sp
->pathmtu
;
4498 params
.spp_sackdelay
= sp
->sackdelay
;
4499 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
4501 /*draft-11 doesn't say what to return in spp_flags*/
4502 params
.spp_flags
= sp
->param_flags
;
4505 if (copy_to_user(optval
, ¶ms
, len
))
4508 if (put_user(len
, optlen
))
4515 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4517 * This option will effect the way delayed acks are performed. This
4518 * option allows you to get or set the delayed ack time, in
4519 * milliseconds. It also allows changing the delayed ack frequency.
4520 * Changing the frequency to 1 disables the delayed sack algorithm. If
4521 * the assoc_id is 0, then this sets or gets the endpoints default
4522 * values. If the assoc_id field is non-zero, then the set or get
4523 * effects the specified association for the one to many model (the
4524 * assoc_id field is ignored by the one to one model). Note that if
4525 * sack_delay or sack_freq are 0 when setting this option, then the
4526 * current values will remain unchanged.
4528 * struct sctp_sack_info {
4529 * sctp_assoc_t sack_assoc_id;
4530 * uint32_t sack_delay;
4531 * uint32_t sack_freq;
4534 * sack_assoc_id - This parameter, indicates which association the user
4535 * is performing an action upon. Note that if this field's value is
4536 * zero then the endpoints default value is changed (effecting future
4537 * associations only).
4539 * sack_delay - This parameter contains the number of milliseconds that
4540 * the user is requesting the delayed ACK timer be set to. Note that
4541 * this value is defined in the standard to be between 200 and 500
4544 * sack_freq - This parameter contains the number of packets that must
4545 * be received before a sack is sent without waiting for the delay
4546 * timer to expire. The default value for this is 2, setting this
4547 * value to 1 will disable the delayed sack algorithm.
4549 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
4550 char __user
*optval
,
4553 struct sctp_sack_info params
;
4554 struct sctp_association
*asoc
= NULL
;
4555 struct sctp_sock
*sp
= sctp_sk(sk
);
4557 if (len
>= sizeof(struct sctp_sack_info
)) {
4558 len
= sizeof(struct sctp_sack_info
);
4560 if (copy_from_user(¶ms
, optval
, len
))
4562 } else if (len
== sizeof(struct sctp_assoc_value
)) {
4563 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4564 pr_warn("Use struct sctp_sack_info instead\n");
4565 if (copy_from_user(¶ms
, optval
, len
))
4570 /* Get association, if sack_assoc_id != 0 and the socket is a one
4571 * to many style socket, and an association was not found, then
4572 * the id was invalid.
4574 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
4575 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
4579 /* Fetch association values. */
4580 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4581 params
.sack_delay
= jiffies_to_msecs(
4583 params
.sack_freq
= asoc
->sackfreq
;
4586 params
.sack_delay
= 0;
4587 params
.sack_freq
= 1;
4590 /* Fetch socket values. */
4591 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
4592 params
.sack_delay
= sp
->sackdelay
;
4593 params
.sack_freq
= sp
->sackfreq
;
4595 params
.sack_delay
= 0;
4596 params
.sack_freq
= 1;
4600 if (copy_to_user(optval
, ¶ms
, len
))
4603 if (put_user(len
, optlen
))
4609 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4611 * Applications can specify protocol parameters for the default association
4612 * initialization. The option name argument to setsockopt() and getsockopt()
4615 * Setting initialization parameters is effective only on an unconnected
4616 * socket (for UDP-style sockets only future associations are effected
4617 * by the change). With TCP-style sockets, this option is inherited by
4618 * sockets derived from a listener socket.
4620 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4622 if (len
< sizeof(struct sctp_initmsg
))
4624 len
= sizeof(struct sctp_initmsg
);
4625 if (put_user(len
, optlen
))
4627 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
4633 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
4634 char __user
*optval
, int __user
*optlen
)
4636 struct sctp_association
*asoc
;
4638 struct sctp_getaddrs getaddrs
;
4639 struct sctp_transport
*from
;
4641 union sctp_addr temp
;
4642 struct sctp_sock
*sp
= sctp_sk(sk
);
4647 if (len
< sizeof(struct sctp_getaddrs
))
4650 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4653 /* For UDP-style sockets, id specifies the association to query. */
4654 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4658 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4659 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4661 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
4663 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
4664 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4665 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4666 if (space_left
< addrlen
)
4668 if (copy_to_user(to
, &temp
, addrlen
))
4672 space_left
-= addrlen
;
4675 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
4677 bytes_copied
= ((char __user
*)to
) - optval
;
4678 if (put_user(bytes_copied
, optlen
))
4684 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
4685 size_t space_left
, int *bytes_copied
)
4687 struct sctp_sockaddr_entry
*addr
;
4688 union sctp_addr temp
;
4691 struct net
*net
= sock_net(sk
);
4694 list_for_each_entry_rcu(addr
, &net
->sctp
.local_addr_list
, list
) {
4698 if ((PF_INET
== sk
->sk_family
) &&
4699 (AF_INET6
== addr
->a
.sa
.sa_family
))
4701 if ((PF_INET6
== sk
->sk_family
) &&
4702 inet_v6_ipv6only(sk
) &&
4703 (AF_INET
== addr
->a
.sa
.sa_family
))
4705 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4706 if (!temp
.v4
.sin_port
)
4707 temp
.v4
.sin_port
= htons(port
);
4709 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sctp_sk(sk
),
4711 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4712 if (space_left
< addrlen
) {
4716 memcpy(to
, &temp
, addrlen
);
4720 space_left
-= addrlen
;
4721 *bytes_copied
+= addrlen
;
4729 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
4730 char __user
*optval
, int __user
*optlen
)
4732 struct sctp_bind_addr
*bp
;
4733 struct sctp_association
*asoc
;
4735 struct sctp_getaddrs getaddrs
;
4736 struct sctp_sockaddr_entry
*addr
;
4738 union sctp_addr temp
;
4739 struct sctp_sock
*sp
= sctp_sk(sk
);
4743 int bytes_copied
= 0;
4747 if (len
< sizeof(struct sctp_getaddrs
))
4750 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
4754 * For UDP-style sockets, id specifies the association to query.
4755 * If the id field is set to the value '0' then the locally bound
4756 * addresses are returned without regard to any particular
4759 if (0 == getaddrs
.assoc_id
) {
4760 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
4762 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
4765 bp
= &asoc
->base
.bind_addr
;
4768 to
= optval
+ offsetof(struct sctp_getaddrs
,addrs
);
4769 space_left
= len
- offsetof(struct sctp_getaddrs
,addrs
);
4771 addrs
= kmalloc(space_left
, GFP_KERNEL
);
4775 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4776 * addresses from the global local address list.
4778 if (sctp_list_single_entry(&bp
->address_list
)) {
4779 addr
= list_entry(bp
->address_list
.next
,
4780 struct sctp_sockaddr_entry
, list
);
4781 if (sctp_is_any(sk
, &addr
->a
)) {
4782 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
4783 space_left
, &bytes_copied
);
4793 /* Protection on the bound address list is not needed since
4794 * in the socket option context we hold a socket lock and
4795 * thus the bound address list can't change.
4797 list_for_each_entry(addr
, &bp
->address_list
, list
) {
4798 memcpy(&temp
, &addr
->a
, sizeof(temp
));
4799 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
, &temp
);
4800 addrlen
= sctp_get_af_specific(temp
.sa
.sa_family
)->sockaddr_len
;
4801 if (space_left
< addrlen
) {
4802 err
= -ENOMEM
; /*fixme: right error?*/
4805 memcpy(buf
, &temp
, addrlen
);
4807 bytes_copied
+= addrlen
;
4809 space_left
-= addrlen
;
4813 if (copy_to_user(to
, addrs
, bytes_copied
)) {
4817 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
4821 if (put_user(bytes_copied
, optlen
))
4828 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4830 * Requests that the local SCTP stack use the enclosed peer address as
4831 * the association primary. The enclosed address must be one of the
4832 * association peer's addresses.
4834 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
4835 char __user
*optval
, int __user
*optlen
)
4837 struct sctp_prim prim
;
4838 struct sctp_association
*asoc
;
4839 struct sctp_sock
*sp
= sctp_sk(sk
);
4841 if (len
< sizeof(struct sctp_prim
))
4844 len
= sizeof(struct sctp_prim
);
4846 if (copy_from_user(&prim
, optval
, len
))
4849 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
4853 if (!asoc
->peer
.primary_path
)
4856 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
4857 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
4859 sctp_get_pf_specific(sk
->sk_family
)->addr_v4map(sp
,
4860 (union sctp_addr
*)&prim
.ssp_addr
);
4862 if (put_user(len
, optlen
))
4864 if (copy_to_user(optval
, &prim
, len
))
4871 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4873 * Requests that the local endpoint set the specified Adaptation Layer
4874 * Indication parameter for all future INIT and INIT-ACK exchanges.
4876 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
4877 char __user
*optval
, int __user
*optlen
)
4879 struct sctp_setadaptation adaptation
;
4881 if (len
< sizeof(struct sctp_setadaptation
))
4884 len
= sizeof(struct sctp_setadaptation
);
4886 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
4888 if (put_user(len
, optlen
))
4890 if (copy_to_user(optval
, &adaptation
, len
))
4898 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4900 * Applications that wish to use the sendto() system call may wish to
4901 * specify a default set of parameters that would normally be supplied
4902 * through the inclusion of ancillary data. This socket option allows
4903 * such an application to set the default sctp_sndrcvinfo structure.
4906 * The application that wishes to use this socket option simply passes
4907 * in to this call the sctp_sndrcvinfo structure defined in Section
4908 * 5.2.2) The input parameters accepted by this call include
4909 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4910 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4911 * to this call if the caller is using the UDP model.
4913 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4915 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
4916 int len
, char __user
*optval
,
4919 struct sctp_sndrcvinfo info
;
4920 struct sctp_association
*asoc
;
4921 struct sctp_sock
*sp
= sctp_sk(sk
);
4923 if (len
< sizeof(struct sctp_sndrcvinfo
))
4926 len
= sizeof(struct sctp_sndrcvinfo
);
4928 if (copy_from_user(&info
, optval
, len
))
4931 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
4932 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
4936 info
.sinfo_stream
= asoc
->default_stream
;
4937 info
.sinfo_flags
= asoc
->default_flags
;
4938 info
.sinfo_ppid
= asoc
->default_ppid
;
4939 info
.sinfo_context
= asoc
->default_context
;
4940 info
.sinfo_timetolive
= asoc
->default_timetolive
;
4942 info
.sinfo_stream
= sp
->default_stream
;
4943 info
.sinfo_flags
= sp
->default_flags
;
4944 info
.sinfo_ppid
= sp
->default_ppid
;
4945 info
.sinfo_context
= sp
->default_context
;
4946 info
.sinfo_timetolive
= sp
->default_timetolive
;
4949 if (put_user(len
, optlen
))
4951 if (copy_to_user(optval
, &info
, len
))
4959 * 7.1.5 SCTP_NODELAY
4961 * Turn on/off any Nagle-like algorithm. This means that packets are
4962 * generally sent as soon as possible and no unnecessary delays are
4963 * introduced, at the cost of more packets in the network. Expects an
4964 * integer boolean flag.
4967 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
4968 char __user
*optval
, int __user
*optlen
)
4972 if (len
< sizeof(int))
4976 val
= (sctp_sk(sk
)->nodelay
== 1);
4977 if (put_user(len
, optlen
))
4979 if (copy_to_user(optval
, &val
, len
))
4986 * 7.1.1 SCTP_RTOINFO
4988 * The protocol parameters used to initialize and bound retransmission
4989 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4990 * and modify these parameters.
4991 * All parameters are time values, in milliseconds. A value of 0, when
4992 * modifying the parameters, indicates that the current value should not
4996 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
4997 char __user
*optval
,
4998 int __user
*optlen
) {
4999 struct sctp_rtoinfo rtoinfo
;
5000 struct sctp_association
*asoc
;
5002 if (len
< sizeof (struct sctp_rtoinfo
))
5005 len
= sizeof(struct sctp_rtoinfo
);
5007 if (copy_from_user(&rtoinfo
, optval
, len
))
5010 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
5012 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
5015 /* Values corresponding to the specific association. */
5017 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
5018 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
5019 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
5021 /* Values corresponding to the endpoint. */
5022 struct sctp_sock
*sp
= sctp_sk(sk
);
5024 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
5025 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
5026 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
5029 if (put_user(len
, optlen
))
5032 if (copy_to_user(optval
, &rtoinfo
, len
))
5040 * 7.1.2 SCTP_ASSOCINFO
5042 * This option is used to tune the maximum retransmission attempts
5043 * of the association.
5044 * Returns an error if the new association retransmission value is
5045 * greater than the sum of the retransmission value of the peer.
5046 * See [SCTP] for more information.
5049 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
5050 char __user
*optval
,
5054 struct sctp_assocparams assocparams
;
5055 struct sctp_association
*asoc
;
5056 struct list_head
*pos
;
5059 if (len
< sizeof (struct sctp_assocparams
))
5062 len
= sizeof(struct sctp_assocparams
);
5064 if (copy_from_user(&assocparams
, optval
, len
))
5067 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
5069 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
5072 /* Values correspoinding to the specific association */
5074 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
5075 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
5076 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
5077 assocparams
.sasoc_cookie_life
= (asoc
->cookie_life
.tv_sec
5079 (asoc
->cookie_life
.tv_usec
5082 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
5086 assocparams
.sasoc_number_peer_destinations
= cnt
;
5088 /* Values corresponding to the endpoint */
5089 struct sctp_sock
*sp
= sctp_sk(sk
);
5091 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
5092 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
5093 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
5094 assocparams
.sasoc_cookie_life
=
5095 sp
->assocparams
.sasoc_cookie_life
;
5096 assocparams
.sasoc_number_peer_destinations
=
5098 sasoc_number_peer_destinations
;
5101 if (put_user(len
, optlen
))
5104 if (copy_to_user(optval
, &assocparams
, len
))
5111 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5113 * This socket option is a boolean flag which turns on or off mapped V4
5114 * addresses. If this option is turned on and the socket is type
5115 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5116 * If this option is turned off, then no mapping will be done of V4
5117 * addresses and a user will receive both PF_INET6 and PF_INET type
5118 * addresses on the socket.
5120 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
5121 char __user
*optval
, int __user
*optlen
)
5124 struct sctp_sock
*sp
= sctp_sk(sk
);
5126 if (len
< sizeof(int))
5131 if (put_user(len
, optlen
))
5133 if (copy_to_user(optval
, &val
, len
))
5140 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5141 * (chapter and verse is quoted at sctp_setsockopt_context())
5143 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
5144 char __user
*optval
, int __user
*optlen
)
5146 struct sctp_assoc_value params
;
5147 struct sctp_sock
*sp
;
5148 struct sctp_association
*asoc
;
5150 if (len
< sizeof(struct sctp_assoc_value
))
5153 len
= sizeof(struct sctp_assoc_value
);
5155 if (copy_from_user(¶ms
, optval
, len
))
5160 if (params
.assoc_id
!= 0) {
5161 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5164 params
.assoc_value
= asoc
->default_rcv_context
;
5166 params
.assoc_value
= sp
->default_rcv_context
;
5169 if (put_user(len
, optlen
))
5171 if (copy_to_user(optval
, ¶ms
, len
))
5178 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5179 * This option will get or set the maximum size to put in any outgoing
5180 * SCTP DATA chunk. If a message is larger than this size it will be
5181 * fragmented by SCTP into the specified size. Note that the underlying
5182 * SCTP implementation may fragment into smaller sized chunks when the
5183 * PMTU of the underlying association is smaller than the value set by
5184 * the user. The default value for this option is '0' which indicates
5185 * the user is NOT limiting fragmentation and only the PMTU will effect
5186 * SCTP's choice of DATA chunk size. Note also that values set larger
5187 * than the maximum size of an IP datagram will effectively let SCTP
5188 * control fragmentation (i.e. the same as setting this option to 0).
5190 * The following structure is used to access and modify this parameter:
5192 * struct sctp_assoc_value {
5193 * sctp_assoc_t assoc_id;
5194 * uint32_t assoc_value;
5197 * assoc_id: This parameter is ignored for one-to-one style sockets.
5198 * For one-to-many style sockets this parameter indicates which
5199 * association the user is performing an action upon. Note that if
5200 * this field's value is zero then the endpoints default value is
5201 * changed (effecting future associations only).
5202 * assoc_value: This parameter specifies the maximum size in bytes.
5204 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
5205 char __user
*optval
, int __user
*optlen
)
5207 struct sctp_assoc_value params
;
5208 struct sctp_association
*asoc
;
5210 if (len
== sizeof(int)) {
5211 pr_warn("Use of int in maxseg socket option deprecated\n");
5212 pr_warn("Use struct sctp_assoc_value instead\n");
5213 params
.assoc_id
= 0;
5214 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5215 len
= sizeof(struct sctp_assoc_value
);
5216 if (copy_from_user(¶ms
, optval
, sizeof(params
)))
5221 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5222 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
5226 params
.assoc_value
= asoc
->frag_point
;
5228 params
.assoc_value
= sctp_sk(sk
)->user_frag
;
5230 if (put_user(len
, optlen
))
5232 if (len
== sizeof(int)) {
5233 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5236 if (copy_to_user(optval
, ¶ms
, len
))
5244 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5245 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5247 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
5248 char __user
*optval
, int __user
*optlen
)
5252 if (len
< sizeof(int))
5257 val
= sctp_sk(sk
)->frag_interleave
;
5258 if (put_user(len
, optlen
))
5260 if (copy_to_user(optval
, &val
, len
))
5267 * 7.1.25. Set or Get the sctp partial delivery point
5268 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5270 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
5271 char __user
*optval
,
5276 if (len
< sizeof(u32
))
5281 val
= sctp_sk(sk
)->pd_point
;
5282 if (put_user(len
, optlen
))
5284 if (copy_to_user(optval
, &val
, len
))
5291 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5292 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5294 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5295 char __user
*optval
,
5298 struct sctp_assoc_value params
;
5299 struct sctp_sock
*sp
;
5300 struct sctp_association
*asoc
;
5302 if (len
== sizeof(int)) {
5303 pr_warn("Use of int in max_burst socket option deprecated\n");
5304 pr_warn("Use struct sctp_assoc_value instead\n");
5305 params
.assoc_id
= 0;
5306 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5307 len
= sizeof(struct sctp_assoc_value
);
5308 if (copy_from_user(¶ms
, optval
, len
))
5315 if (params
.assoc_id
!= 0) {
5316 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5319 params
.assoc_value
= asoc
->max_burst
;
5321 params
.assoc_value
= sp
->max_burst
;
5323 if (len
== sizeof(int)) {
5324 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5327 if (copy_to_user(optval
, ¶ms
, len
))
5335 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5336 char __user
*optval
, int __user
*optlen
)
5338 struct net
*net
= sock_net(sk
);
5339 struct sctp_hmacalgo __user
*p
= (void __user
*)optval
;
5340 struct sctp_hmac_algo_param
*hmacs
;
5344 if (!net
->sctp
.auth_enable
)
5347 hmacs
= sctp_sk(sk
)->ep
->auth_hmacs_list
;
5348 data_len
= ntohs(hmacs
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5350 if (len
< sizeof(struct sctp_hmacalgo
) + data_len
)
5353 len
= sizeof(struct sctp_hmacalgo
) + data_len
;
5354 num_idents
= data_len
/ sizeof(u16
);
5356 if (put_user(len
, optlen
))
5358 if (put_user(num_idents
, &p
->shmac_num_idents
))
5360 if (copy_to_user(p
->shmac_idents
, hmacs
->hmac_ids
, data_len
))
5365 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5366 char __user
*optval
, int __user
*optlen
)
5368 struct net
*net
= sock_net(sk
);
5369 struct sctp_authkeyid val
;
5370 struct sctp_association
*asoc
;
5372 if (!net
->sctp
.auth_enable
)
5375 if (len
< sizeof(struct sctp_authkeyid
))
5377 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5380 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5381 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5385 val
.scact_keynumber
= asoc
->active_key_id
;
5387 val
.scact_keynumber
= sctp_sk(sk
)->ep
->active_key_id
;
5389 len
= sizeof(struct sctp_authkeyid
);
5390 if (put_user(len
, optlen
))
5392 if (copy_to_user(optval
, &val
, len
))
5398 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5399 char __user
*optval
, int __user
*optlen
)
5401 struct net
*net
= sock_net(sk
);
5402 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5403 struct sctp_authchunks val
;
5404 struct sctp_association
*asoc
;
5405 struct sctp_chunks_param
*ch
;
5409 if (!net
->sctp
.auth_enable
)
5412 if (len
< sizeof(struct sctp_authchunks
))
5415 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
5418 to
= p
->gauth_chunks
;
5419 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5423 ch
= asoc
->peer
.peer_chunks
;
5427 /* See if the user provided enough room for all the data */
5428 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5429 if (len
< num_chunks
)
5432 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
5435 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
5436 if (put_user(len
, optlen
)) return -EFAULT
;
5437 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5442 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
5443 char __user
*optval
, int __user
*optlen
)
5445 struct net
*net
= sock_net(sk
);
5446 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5447 struct sctp_authchunks val
;
5448 struct sctp_association
*asoc
;
5449 struct sctp_chunks_param
*ch
;
5453 if (!net
->sctp
.auth_enable
)
5456 if (len
< sizeof(struct sctp_authchunks
))
5459 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
5462 to
= p
->gauth_chunks
;
5463 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
5464 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
5468 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
5470 ch
= sctp_sk(sk
)->ep
->auth_chunk_list
;
5475 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5476 if (len
< sizeof(struct sctp_authchunks
) + num_chunks
)
5479 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
5482 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
5483 if (put_user(len
, optlen
))
5485 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
5492 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5493 * This option gets the current number of associations that are attached
5494 * to a one-to-many style socket. The option value is an uint32_t.
5496 static int sctp_getsockopt_assoc_number(struct sock
*sk
, int len
,
5497 char __user
*optval
, int __user
*optlen
)
5499 struct sctp_sock
*sp
= sctp_sk(sk
);
5500 struct sctp_association
*asoc
;
5503 if (sctp_style(sk
, TCP
))
5506 if (len
< sizeof(u32
))
5511 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5515 if (put_user(len
, optlen
))
5517 if (copy_to_user(optval
, &val
, len
))
5524 * 8.1.23 SCTP_AUTO_ASCONF
5525 * See the corresponding setsockopt entry as description
5527 static int sctp_getsockopt_auto_asconf(struct sock
*sk
, int len
,
5528 char __user
*optval
, int __user
*optlen
)
5532 if (len
< sizeof(int))
5536 if (sctp_sk(sk
)->do_auto_asconf
&& sctp_is_ep_boundall(sk
))
5538 if (put_user(len
, optlen
))
5540 if (copy_to_user(optval
, &val
, len
))
5546 * 8.2.6. Get the Current Identifiers of Associations
5547 * (SCTP_GET_ASSOC_ID_LIST)
5549 * This option gets the current list of SCTP association identifiers of
5550 * the SCTP associations handled by a one-to-many style socket.
5552 static int sctp_getsockopt_assoc_ids(struct sock
*sk
, int len
,
5553 char __user
*optval
, int __user
*optlen
)
5555 struct sctp_sock
*sp
= sctp_sk(sk
);
5556 struct sctp_association
*asoc
;
5557 struct sctp_assoc_ids
*ids
;
5560 if (sctp_style(sk
, TCP
))
5563 if (len
< sizeof(struct sctp_assoc_ids
))
5566 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5570 if (len
< sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
)
5573 len
= sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
;
5575 ids
= kmalloc(len
, GFP_KERNEL
);
5579 ids
->gaids_number_of_ids
= num
;
5581 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
5582 ids
->gaids_assoc_id
[num
++] = asoc
->assoc_id
;
5585 if (put_user(len
, optlen
) || copy_to_user(optval
, ids
, len
)) {
5595 * SCTP_PEER_ADDR_THLDS
5597 * This option allows us to fetch the partially failed threshold for one or all
5598 * transports in an association. See Section 6.1 of:
5599 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5601 static int sctp_getsockopt_paddr_thresholds(struct sock
*sk
,
5602 char __user
*optval
,
5606 struct sctp_paddrthlds val
;
5607 struct sctp_transport
*trans
;
5608 struct sctp_association
*asoc
;
5610 if (len
< sizeof(struct sctp_paddrthlds
))
5612 len
= sizeof(struct sctp_paddrthlds
);
5613 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
, len
))
5616 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
5617 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
5621 val
.spt_pathpfthld
= asoc
->pf_retrans
;
5622 val
.spt_pathmaxrxt
= asoc
->pathmaxrxt
;
5624 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
5629 val
.spt_pathmaxrxt
= trans
->pathmaxrxt
;
5630 val
.spt_pathpfthld
= trans
->pf_retrans
;
5633 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
5640 * SCTP_GET_ASSOC_STATS
5642 * This option retrieves local per endpoint statistics. It is modeled
5643 * after OpenSolaris' implementation
5645 static int sctp_getsockopt_assoc_stats(struct sock
*sk
, int len
,
5646 char __user
*optval
,
5649 struct sctp_assoc_stats sas
;
5650 struct sctp_association
*asoc
= NULL
;
5652 /* User must provide at least the assoc id */
5653 if (len
< sizeof(sctp_assoc_t
))
5656 /* Allow the struct to grow and fill in as much as possible */
5657 len
= min_t(size_t, len
, sizeof(sas
));
5659 if (copy_from_user(&sas
, optval
, len
))
5662 asoc
= sctp_id2assoc(sk
, sas
.sas_assoc_id
);
5666 sas
.sas_rtxchunks
= asoc
->stats
.rtxchunks
;
5667 sas
.sas_gapcnt
= asoc
->stats
.gapcnt
;
5668 sas
.sas_outofseqtsns
= asoc
->stats
.outofseqtsns
;
5669 sas
.sas_osacks
= asoc
->stats
.osacks
;
5670 sas
.sas_isacks
= asoc
->stats
.isacks
;
5671 sas
.sas_octrlchunks
= asoc
->stats
.octrlchunks
;
5672 sas
.sas_ictrlchunks
= asoc
->stats
.ictrlchunks
;
5673 sas
.sas_oodchunks
= asoc
->stats
.oodchunks
;
5674 sas
.sas_iodchunks
= asoc
->stats
.iodchunks
;
5675 sas
.sas_ouodchunks
= asoc
->stats
.ouodchunks
;
5676 sas
.sas_iuodchunks
= asoc
->stats
.iuodchunks
;
5677 sas
.sas_idupchunks
= asoc
->stats
.idupchunks
;
5678 sas
.sas_opackets
= asoc
->stats
.opackets
;
5679 sas
.sas_ipackets
= asoc
->stats
.ipackets
;
5681 /* New high max rto observed, will return 0 if not a single
5682 * RTO update took place. obs_rto_ipaddr will be bogus
5685 sas
.sas_maxrto
= asoc
->stats
.max_obs_rto
;
5686 memcpy(&sas
.sas_obs_rto_ipaddr
, &asoc
->stats
.obs_rto_ipaddr
,
5687 sizeof(struct sockaddr_storage
));
5689 /* Mark beginning of a new observation period */
5690 asoc
->stats
.max_obs_rto
= asoc
->rto_min
;
5692 if (put_user(len
, optlen
))
5695 SCTP_DEBUG_PRINTK("sctp_getsockopt_assoc_stat(%d): %d\n",
5696 len
, sas
.sas_assoc_id
);
5698 if (copy_to_user(optval
, &sas
, len
))
5704 static int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
5705 char __user
*optval
, int __user
*optlen
)
5710 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5713 /* I can hardly begin to describe how wrong this is. This is
5714 * so broken as to be worse than useless. The API draft
5715 * REALLY is NOT helpful here... I am not convinced that the
5716 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5717 * are at all well-founded.
5719 if (level
!= SOL_SCTP
) {
5720 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
5722 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
5726 if (get_user(len
, optlen
))
5733 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
5735 case SCTP_DISABLE_FRAGMENTS
:
5736 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
5740 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
5742 case SCTP_AUTOCLOSE
:
5743 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
5745 case SCTP_SOCKOPT_PEELOFF
:
5746 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
5748 case SCTP_PEER_ADDR_PARAMS
:
5749 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
5752 case SCTP_DELAYED_SACK
:
5753 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
5757 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
5759 case SCTP_GET_PEER_ADDRS
:
5760 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
5763 case SCTP_GET_LOCAL_ADDRS
:
5764 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
5767 case SCTP_SOCKOPT_CONNECTX3
:
5768 retval
= sctp_getsockopt_connectx3(sk
, len
, optval
, optlen
);
5770 case SCTP_DEFAULT_SEND_PARAM
:
5771 retval
= sctp_getsockopt_default_send_param(sk
, len
,
5774 case SCTP_PRIMARY_ADDR
:
5775 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
5778 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
5781 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
5783 case SCTP_ASSOCINFO
:
5784 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
5786 case SCTP_I_WANT_MAPPED_V4_ADDR
:
5787 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
5790 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
5792 case SCTP_GET_PEER_ADDR_INFO
:
5793 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
5796 case SCTP_ADAPTATION_LAYER
:
5797 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
5801 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
5803 case SCTP_FRAGMENT_INTERLEAVE
:
5804 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
5807 case SCTP_PARTIAL_DELIVERY_POINT
:
5808 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
5811 case SCTP_MAX_BURST
:
5812 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
5815 case SCTP_AUTH_CHUNK
:
5816 case SCTP_AUTH_DELETE_KEY
:
5817 retval
= -EOPNOTSUPP
;
5819 case SCTP_HMAC_IDENT
:
5820 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
5822 case SCTP_AUTH_ACTIVE_KEY
:
5823 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
5825 case SCTP_PEER_AUTH_CHUNKS
:
5826 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
5829 case SCTP_LOCAL_AUTH_CHUNKS
:
5830 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
5833 case SCTP_GET_ASSOC_NUMBER
:
5834 retval
= sctp_getsockopt_assoc_number(sk
, len
, optval
, optlen
);
5836 case SCTP_GET_ASSOC_ID_LIST
:
5837 retval
= sctp_getsockopt_assoc_ids(sk
, len
, optval
, optlen
);
5839 case SCTP_AUTO_ASCONF
:
5840 retval
= sctp_getsockopt_auto_asconf(sk
, len
, optval
, optlen
);
5842 case SCTP_PEER_ADDR_THLDS
:
5843 retval
= sctp_getsockopt_paddr_thresholds(sk
, optval
, len
, optlen
);
5845 case SCTP_GET_ASSOC_STATS
:
5846 retval
= sctp_getsockopt_assoc_stats(sk
, len
, optval
, optlen
);
5849 retval
= -ENOPROTOOPT
;
5853 sctp_release_sock(sk
);
5857 static void sctp_hash(struct sock
*sk
)
5862 static void sctp_unhash(struct sock
*sk
)
5867 /* Check if port is acceptable. Possibly find first available port.
5869 * The port hash table (contained in the 'global' SCTP protocol storage
5870 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5871 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5872 * list (the list number is the port number hashed out, so as you
5873 * would expect from a hash function, all the ports in a given list have
5874 * such a number that hashes out to the same list number; you were
5875 * expecting that, right?); so each list has a set of ports, with a
5876 * link to the socket (struct sock) that uses it, the port number and
5877 * a fastreuse flag (FIXME: NPI ipg).
5879 static struct sctp_bind_bucket
*sctp_bucket_create(
5880 struct sctp_bind_hashbucket
*head
, struct net
*, unsigned short snum
);
5882 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
5884 struct sctp_bind_hashbucket
*head
; /* hash list */
5885 struct sctp_bind_bucket
*pp
;
5886 unsigned short snum
;
5889 snum
= ntohs(addr
->v4
.sin_port
);
5891 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum
);
5892 sctp_local_bh_disable();
5895 /* Search for an available port. */
5896 int low
, high
, remaining
, index
;
5899 inet_get_local_port_range(&low
, &high
);
5900 remaining
= (high
- low
) + 1;
5901 rover
= net_random() % remaining
+ low
;
5905 if ((rover
< low
) || (rover
> high
))
5907 if (inet_is_reserved_local_port(rover
))
5909 index
= sctp_phashfn(sock_net(sk
), rover
);
5910 head
= &sctp_port_hashtable
[index
];
5911 sctp_spin_lock(&head
->lock
);
5912 sctp_for_each_hentry(pp
, &head
->chain
)
5913 if ((pp
->port
== rover
) &&
5914 net_eq(sock_net(sk
), pp
->net
))
5918 sctp_spin_unlock(&head
->lock
);
5919 } while (--remaining
> 0);
5921 /* Exhausted local port range during search? */
5926 /* OK, here is the one we will use. HEAD (the port
5927 * hash table list entry) is non-NULL and we hold it's
5932 /* We are given an specific port number; we verify
5933 * that it is not being used. If it is used, we will
5934 * exahust the search in the hash list corresponding
5935 * to the port number (snum) - we detect that with the
5936 * port iterator, pp being NULL.
5938 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
), snum
)];
5939 sctp_spin_lock(&head
->lock
);
5940 sctp_for_each_hentry(pp
, &head
->chain
) {
5941 if ((pp
->port
== snum
) && net_eq(pp
->net
, sock_net(sk
)))
5948 if (!hlist_empty(&pp
->owner
)) {
5949 /* We had a port hash table hit - there is an
5950 * available port (pp != NULL) and it is being
5951 * used by other socket (pp->owner not empty); that other
5952 * socket is going to be sk2.
5954 int reuse
= sk
->sk_reuse
;
5957 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5958 if (pp
->fastreuse
&& sk
->sk_reuse
&&
5959 sk
->sk_state
!= SCTP_SS_LISTENING
)
5962 /* Run through the list of sockets bound to the port
5963 * (pp->port) [via the pointers bind_next and
5964 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5965 * we get the endpoint they describe and run through
5966 * the endpoint's list of IP (v4 or v6) addresses,
5967 * comparing each of the addresses with the address of
5968 * the socket sk. If we find a match, then that means
5969 * that this port/socket (sk) combination are already
5972 sk_for_each_bound(sk2
, &pp
->owner
) {
5973 struct sctp_endpoint
*ep2
;
5974 ep2
= sctp_sk(sk2
)->ep
;
5977 (reuse
&& sk2
->sk_reuse
&&
5978 sk2
->sk_state
!= SCTP_SS_LISTENING
))
5981 if (sctp_bind_addr_conflict(&ep2
->base
.bind_addr
, addr
,
5982 sctp_sk(sk2
), sctp_sk(sk
))) {
5987 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5990 /* If there was a hash table miss, create a new port. */
5992 if (!pp
&& !(pp
= sctp_bucket_create(head
, sock_net(sk
), snum
)))
5995 /* In either case (hit or miss), make sure fastreuse is 1 only
5996 * if sk->sk_reuse is too (that is, if the caller requested
5997 * SO_REUSEADDR on this socket -sk-).
5999 if (hlist_empty(&pp
->owner
)) {
6000 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
6004 } else if (pp
->fastreuse
&&
6005 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
6008 /* We are set, so fill up all the data in the hash table
6009 * entry, tie the socket list information with the rest of the
6010 * sockets FIXME: Blurry, NPI (ipg).
6013 if (!sctp_sk(sk
)->bind_hash
) {
6014 inet_sk(sk
)->inet_num
= snum
;
6015 sk_add_bind_node(sk
, &pp
->owner
);
6016 sctp_sk(sk
)->bind_hash
= pp
;
6021 sctp_spin_unlock(&head
->lock
);
6024 sctp_local_bh_enable();
6028 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6029 * port is requested.
6031 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
6034 union sctp_addr addr
;
6035 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
6037 /* Set up a dummy address struct from the sk. */
6038 af
->from_sk(&addr
, sk
);
6039 addr
.v4
.sin_port
= htons(snum
);
6041 /* Note: sk->sk_num gets filled in if ephemeral port request. */
6042 ret
= sctp_get_port_local(sk
, &addr
);
6048 * Move a socket to LISTENING state.
6050 static int sctp_listen_start(struct sock
*sk
, int backlog
)
6052 struct sctp_sock
*sp
= sctp_sk(sk
);
6053 struct sctp_endpoint
*ep
= sp
->ep
;
6054 struct crypto_hash
*tfm
= NULL
;
6057 /* Allocate HMAC for generating cookie. */
6058 if (!sp
->hmac
&& sp
->sctp_hmac_alg
) {
6059 sprintf(alg
, "hmac(%s)", sp
->sctp_hmac_alg
);
6060 tfm
= crypto_alloc_hash(alg
, 0, CRYPTO_ALG_ASYNC
);
6062 net_info_ratelimited("failed to load transform for %s: %ld\n",
6063 sp
->sctp_hmac_alg
, PTR_ERR(tfm
));
6066 sctp_sk(sk
)->hmac
= tfm
;
6070 * If a bind() or sctp_bindx() is not called prior to a listen()
6071 * call that allows new associations to be accepted, the system
6072 * picks an ephemeral port and will choose an address set equivalent
6073 * to binding with a wildcard address.
6075 * This is not currently spelled out in the SCTP sockets
6076 * extensions draft, but follows the practice as seen in TCP
6080 sk
->sk_state
= SCTP_SS_LISTENING
;
6081 if (!ep
->base
.bind_addr
.port
) {
6082 if (sctp_autobind(sk
))
6085 if (sctp_get_port(sk
, inet_sk(sk
)->inet_num
)) {
6086 sk
->sk_state
= SCTP_SS_CLOSED
;
6091 sk
->sk_max_ack_backlog
= backlog
;
6092 sctp_hash_endpoint(ep
);
6097 * 4.1.3 / 5.1.3 listen()
6099 * By default, new associations are not accepted for UDP style sockets.
6100 * An application uses listen() to mark a socket as being able to
6101 * accept new associations.
6103 * On TCP style sockets, applications use listen() to ready the SCTP
6104 * endpoint for accepting inbound associations.
6106 * On both types of endpoints a backlog of '0' disables listening.
6108 * Move a socket to LISTENING state.
6110 int sctp_inet_listen(struct socket
*sock
, int backlog
)
6112 struct sock
*sk
= sock
->sk
;
6113 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6116 if (unlikely(backlog
< 0))
6121 /* Peeled-off sockets are not allowed to listen(). */
6122 if (sctp_style(sk
, UDP_HIGH_BANDWIDTH
))
6125 if (sock
->state
!= SS_UNCONNECTED
)
6128 /* If backlog is zero, disable listening. */
6130 if (sctp_sstate(sk
, CLOSED
))
6134 sctp_unhash_endpoint(ep
);
6135 sk
->sk_state
= SCTP_SS_CLOSED
;
6137 sctp_sk(sk
)->bind_hash
->fastreuse
= 1;
6141 /* If we are already listening, just update the backlog */
6142 if (sctp_sstate(sk
, LISTENING
))
6143 sk
->sk_max_ack_backlog
= backlog
;
6145 err
= sctp_listen_start(sk
, backlog
);
6152 sctp_release_sock(sk
);
6157 * This function is done by modeling the current datagram_poll() and the
6158 * tcp_poll(). Note that, based on these implementations, we don't
6159 * lock the socket in this function, even though it seems that,
6160 * ideally, locking or some other mechanisms can be used to ensure
6161 * the integrity of the counters (sndbuf and wmem_alloc) used
6162 * in this place. We assume that we don't need locks either until proven
6165 * Another thing to note is that we include the Async I/O support
6166 * here, again, by modeling the current TCP/UDP code. We don't have
6167 * a good way to test with it yet.
6169 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
6171 struct sock
*sk
= sock
->sk
;
6172 struct sctp_sock
*sp
= sctp_sk(sk
);
6175 poll_wait(file
, sk_sleep(sk
), wait
);
6177 /* A TCP-style listening socket becomes readable when the accept queue
6180 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
6181 return (!list_empty(&sp
->ep
->asocs
)) ?
6182 (POLLIN
| POLLRDNORM
) : 0;
6186 /* Is there any exceptional events? */
6187 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
6189 sock_flag(sk
, SOCK_SELECT_ERR_QUEUE
) ? POLLPRI
: 0;
6190 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6191 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
6192 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
6195 /* Is it readable? Reconsider this code with TCP-style support. */
6196 if (!skb_queue_empty(&sk
->sk_receive_queue
))
6197 mask
|= POLLIN
| POLLRDNORM
;
6199 /* The association is either gone or not ready. */
6200 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
6203 /* Is it writable? */
6204 if (sctp_writeable(sk
)) {
6205 mask
|= POLLOUT
| POLLWRNORM
;
6207 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
6209 * Since the socket is not locked, the buffer
6210 * might be made available after the writeable check and
6211 * before the bit is set. This could cause a lost I/O
6212 * signal. tcp_poll() has a race breaker for this race
6213 * condition. Based on their implementation, we put
6214 * in the following code to cover it as well.
6216 if (sctp_writeable(sk
))
6217 mask
|= POLLOUT
| POLLWRNORM
;
6222 /********************************************************************
6223 * 2nd Level Abstractions
6224 ********************************************************************/
6226 static struct sctp_bind_bucket
*sctp_bucket_create(
6227 struct sctp_bind_hashbucket
*head
, struct net
*net
, unsigned short snum
)
6229 struct sctp_bind_bucket
*pp
;
6231 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
6233 SCTP_DBG_OBJCNT_INC(bind_bucket
);
6236 INIT_HLIST_HEAD(&pp
->owner
);
6238 hlist_add_head(&pp
->node
, &head
->chain
);
6243 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6244 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
6246 if (pp
&& hlist_empty(&pp
->owner
)) {
6247 __hlist_del(&pp
->node
);
6248 kmem_cache_free(sctp_bucket_cachep
, pp
);
6249 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
6253 /* Release this socket's reference to a local port. */
6254 static inline void __sctp_put_port(struct sock
*sk
)
6256 struct sctp_bind_hashbucket
*head
=
6257 &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
),
6258 inet_sk(sk
)->inet_num
)];
6259 struct sctp_bind_bucket
*pp
;
6261 sctp_spin_lock(&head
->lock
);
6262 pp
= sctp_sk(sk
)->bind_hash
;
6263 __sk_del_bind_node(sk
);
6264 sctp_sk(sk
)->bind_hash
= NULL
;
6265 inet_sk(sk
)->inet_num
= 0;
6266 sctp_bucket_destroy(pp
);
6267 sctp_spin_unlock(&head
->lock
);
6270 void sctp_put_port(struct sock
*sk
)
6272 sctp_local_bh_disable();
6273 __sctp_put_port(sk
);
6274 sctp_local_bh_enable();
6278 * The system picks an ephemeral port and choose an address set equivalent
6279 * to binding with a wildcard address.
6280 * One of those addresses will be the primary address for the association.
6281 * This automatically enables the multihoming capability of SCTP.
6283 static int sctp_autobind(struct sock
*sk
)
6285 union sctp_addr autoaddr
;
6289 /* Initialize a local sockaddr structure to INADDR_ANY. */
6290 af
= sctp_sk(sk
)->pf
->af
;
6292 port
= htons(inet_sk(sk
)->inet_num
);
6293 af
->inaddr_any(&autoaddr
, port
);
6295 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
6298 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6301 * 4.2 The cmsghdr Structure *
6303 * When ancillary data is sent or received, any number of ancillary data
6304 * objects can be specified by the msg_control and msg_controllen members of
6305 * the msghdr structure, because each object is preceded by
6306 * a cmsghdr structure defining the object's length (the cmsg_len member).
6307 * Historically Berkeley-derived implementations have passed only one object
6308 * at a time, but this API allows multiple objects to be
6309 * passed in a single call to sendmsg() or recvmsg(). The following example
6310 * shows two ancillary data objects in a control buffer.
6312 * |<--------------------------- msg_controllen -------------------------->|
6315 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6317 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6320 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6322 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6325 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6326 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6328 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6330 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6337 static int sctp_msghdr_parse(const struct msghdr
*msg
, sctp_cmsgs_t
*cmsgs
)
6339 struct cmsghdr
*cmsg
;
6340 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
6342 for (cmsg
= CMSG_FIRSTHDR(msg
);
6344 cmsg
= CMSG_NXTHDR(my_msg
, cmsg
)) {
6345 if (!CMSG_OK(my_msg
, cmsg
))
6348 /* Should we parse this header or ignore? */
6349 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
6352 /* Strictly check lengths following example in SCM code. */
6353 switch (cmsg
->cmsg_type
) {
6355 /* SCTP Socket API Extension
6356 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
6358 * This cmsghdr structure provides information for
6359 * initializing new SCTP associations with sendmsg().
6360 * The SCTP_INITMSG socket option uses this same data
6361 * structure. This structure is not used for
6364 * cmsg_level cmsg_type cmsg_data[]
6365 * ------------ ------------ ----------------------
6366 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6368 if (cmsg
->cmsg_len
!=
6369 CMSG_LEN(sizeof(struct sctp_initmsg
)))
6371 cmsgs
->init
= (struct sctp_initmsg
*)CMSG_DATA(cmsg
);
6375 /* SCTP Socket API Extension
6376 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6378 * This cmsghdr structure specifies SCTP options for
6379 * sendmsg() and describes SCTP header information
6380 * about a received message through recvmsg().
6382 * cmsg_level cmsg_type cmsg_data[]
6383 * ------------ ------------ ----------------------
6384 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6386 if (cmsg
->cmsg_len
!=
6387 CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
6391 (struct sctp_sndrcvinfo
*)CMSG_DATA(cmsg
);
6393 /* Minimally, validate the sinfo_flags. */
6394 if (cmsgs
->info
->sinfo_flags
&
6395 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
6396 SCTP_ABORT
| SCTP_EOF
))
6408 * Wait for a packet..
6409 * Note: This function is the same function as in core/datagram.c
6410 * with a few modifications to make lksctp work.
6412 static int sctp_wait_for_packet(struct sock
* sk
, int *err
, long *timeo_p
)
6417 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
6419 /* Socket errors? */
6420 error
= sock_error(sk
);
6424 if (!skb_queue_empty(&sk
->sk_receive_queue
))
6427 /* Socket shut down? */
6428 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6431 /* Sequenced packets can come disconnected. If so we report the
6436 /* Is there a good reason to think that we may receive some data? */
6437 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
6440 /* Handle signals. */
6441 if (signal_pending(current
))
6444 /* Let another process have a go. Since we are going to sleep
6445 * anyway. Note: This may cause odd behaviors if the message
6446 * does not fit in the user's buffer, but this seems to be the
6447 * only way to honor MSG_DONTWAIT realistically.
6449 sctp_release_sock(sk
);
6450 *timeo_p
= schedule_timeout(*timeo_p
);
6454 finish_wait(sk_sleep(sk
), &wait
);
6458 error
= sock_intr_errno(*timeo_p
);
6461 finish_wait(sk_sleep(sk
), &wait
);
6466 /* Receive a datagram.
6467 * Note: This is pretty much the same routine as in core/datagram.c
6468 * with a few changes to make lksctp work.
6470 static struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
6471 int noblock
, int *err
)
6474 struct sk_buff
*skb
;
6477 timeo
= sock_rcvtimeo(sk
, noblock
);
6479 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6480 timeo
, MAX_SCHEDULE_TIMEOUT
);
6483 /* Again only user level code calls this function,
6484 * so nothing interrupt level
6485 * will suddenly eat the receive_queue.
6487 * Look at current nfs client by the way...
6488 * However, this function was correct in any case. 8)
6490 if (flags
& MSG_PEEK
) {
6491 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
6492 skb
= skb_peek(&sk
->sk_receive_queue
);
6494 atomic_inc(&skb
->users
);
6495 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
6497 skb
= skb_dequeue(&sk
->sk_receive_queue
);
6503 /* Caller is allowed not to check sk->sk_err before calling. */
6504 error
= sock_error(sk
);
6508 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6511 /* User doesn't want to wait. */
6515 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
6524 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6525 static void __sctp_write_space(struct sctp_association
*asoc
)
6527 struct sock
*sk
= asoc
->base
.sk
;
6528 struct socket
*sock
= sk
->sk_socket
;
6530 if ((sctp_wspace(asoc
) > 0) && sock
) {
6531 if (waitqueue_active(&asoc
->wait
))
6532 wake_up_interruptible(&asoc
->wait
);
6534 if (sctp_writeable(sk
)) {
6535 wait_queue_head_t
*wq
= sk_sleep(sk
);
6537 if (wq
&& waitqueue_active(wq
))
6538 wake_up_interruptible(wq
);
6540 /* Note that we try to include the Async I/O support
6541 * here by modeling from the current TCP/UDP code.
6542 * We have not tested with it yet.
6544 if (!(sk
->sk_shutdown
& SEND_SHUTDOWN
))
6545 sock_wake_async(sock
,
6546 SOCK_WAKE_SPACE
, POLL_OUT
);
6551 /* Do accounting for the sndbuf space.
6552 * Decrement the used sndbuf space of the corresponding association by the
6553 * data size which was just transmitted(freed).
6555 static void sctp_wfree(struct sk_buff
*skb
)
6557 struct sctp_association
*asoc
;
6558 struct sctp_chunk
*chunk
;
6561 /* Get the saved chunk pointer. */
6562 chunk
= *((struct sctp_chunk
**)(skb
->cb
));
6565 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
6566 sizeof(struct sk_buff
) +
6567 sizeof(struct sctp_chunk
);
6569 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
6572 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6574 sk
->sk_wmem_queued
-= skb
->truesize
;
6575 sk_mem_uncharge(sk
, skb
->truesize
);
6578 __sctp_write_space(asoc
);
6580 sctp_association_put(asoc
);
6583 /* Do accounting for the receive space on the socket.
6584 * Accounting for the association is done in ulpevent.c
6585 * We set this as a destructor for the cloned data skbs so that
6586 * accounting is done at the correct time.
6588 void sctp_sock_rfree(struct sk_buff
*skb
)
6590 struct sock
*sk
= skb
->sk
;
6591 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
6593 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
6596 * Mimic the behavior of sock_rfree
6598 sk_mem_uncharge(sk
, event
->rmem_len
);
6602 /* Helper function to wait for space in the sndbuf. */
6603 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
6606 struct sock
*sk
= asoc
->base
.sk
;
6608 long current_timeo
= *timeo_p
;
6611 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6612 asoc
, (long)(*timeo_p
), msg_len
);
6614 /* Increment the association's refcnt. */
6615 sctp_association_hold(asoc
);
6617 /* Wait on the association specific sndbuf space. */
6619 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6620 TASK_INTERRUPTIBLE
);
6623 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6626 if (signal_pending(current
))
6627 goto do_interrupted
;
6628 if (msg_len
<= sctp_wspace(asoc
))
6631 /* Let another process have a go. Since we are going
6634 sctp_release_sock(sk
);
6635 current_timeo
= schedule_timeout(current_timeo
);
6636 BUG_ON(sk
!= asoc
->base
.sk
);
6639 *timeo_p
= current_timeo
;
6643 finish_wait(&asoc
->wait
, &wait
);
6645 /* Release the association's refcnt. */
6646 sctp_association_put(asoc
);
6655 err
= sock_intr_errno(*timeo_p
);
6663 void sctp_data_ready(struct sock
*sk
, int len
)
6665 struct socket_wq
*wq
;
6668 wq
= rcu_dereference(sk
->sk_wq
);
6669 if (wq_has_sleeper(wq
))
6670 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
6671 POLLRDNORM
| POLLRDBAND
);
6672 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
6676 /* If socket sndbuf has changed, wake up all per association waiters. */
6677 void sctp_write_space(struct sock
*sk
)
6679 struct sctp_association
*asoc
;
6681 /* Wake up the tasks in each wait queue. */
6682 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
6683 __sctp_write_space(asoc
);
6687 /* Is there any sndbuf space available on the socket?
6689 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6690 * associations on the same socket. For a UDP-style socket with
6691 * multiple associations, it is possible for it to be "unwriteable"
6692 * prematurely. I assume that this is acceptable because
6693 * a premature "unwriteable" is better than an accidental "writeable" which
6694 * would cause an unwanted block under certain circumstances. For the 1-1
6695 * UDP-style sockets or TCP-style sockets, this code should work.
6698 static int sctp_writeable(struct sock
*sk
)
6702 amt
= sk
->sk_sndbuf
- sk_wmem_alloc_get(sk
);
6708 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6709 * returns immediately with EINPROGRESS.
6711 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
6713 struct sock
*sk
= asoc
->base
.sk
;
6715 long current_timeo
= *timeo_p
;
6718 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__
, asoc
,
6721 /* Increment the association's refcnt. */
6722 sctp_association_hold(asoc
);
6725 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
6726 TASK_INTERRUPTIBLE
);
6729 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
6731 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
6734 if (signal_pending(current
))
6735 goto do_interrupted
;
6737 if (sctp_state(asoc
, ESTABLISHED
))
6740 /* Let another process have a go. Since we are going
6743 sctp_release_sock(sk
);
6744 current_timeo
= schedule_timeout(current_timeo
);
6747 *timeo_p
= current_timeo
;
6751 finish_wait(&asoc
->wait
, &wait
);
6753 /* Release the association's refcnt. */
6754 sctp_association_put(asoc
);
6759 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
6762 err
= -ECONNREFUSED
;
6766 err
= sock_intr_errno(*timeo_p
);
6774 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
6776 struct sctp_endpoint
*ep
;
6780 ep
= sctp_sk(sk
)->ep
;
6784 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
6785 TASK_INTERRUPTIBLE
);
6787 if (list_empty(&ep
->asocs
)) {
6788 sctp_release_sock(sk
);
6789 timeo
= schedule_timeout(timeo
);
6794 if (!sctp_sstate(sk
, LISTENING
))
6798 if (!list_empty(&ep
->asocs
))
6801 err
= sock_intr_errno(timeo
);
6802 if (signal_pending(current
))
6810 finish_wait(sk_sleep(sk
), &wait
);
6815 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
6820 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
6821 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
6823 sctp_release_sock(sk
);
6824 timeout
= schedule_timeout(timeout
);
6826 } while (!signal_pending(current
) && timeout
);
6828 finish_wait(sk_sleep(sk
), &wait
);
6831 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
6833 struct sk_buff
*frag
;
6838 /* Don't forget the fragments. */
6839 skb_walk_frags(skb
, frag
)
6840 sctp_skb_set_owner_r_frag(frag
, sk
);
6843 sctp_skb_set_owner_r(skb
, sk
);
6846 void sctp_copy_sock(struct sock
*newsk
, struct sock
*sk
,
6847 struct sctp_association
*asoc
)
6849 struct inet_sock
*inet
= inet_sk(sk
);
6850 struct inet_sock
*newinet
;
6852 newsk
->sk_type
= sk
->sk_type
;
6853 newsk
->sk_bound_dev_if
= sk
->sk_bound_dev_if
;
6854 newsk
->sk_flags
= sk
->sk_flags
;
6855 newsk
->sk_no_check
= sk
->sk_no_check
;
6856 newsk
->sk_reuse
= sk
->sk_reuse
;
6858 newsk
->sk_shutdown
= sk
->sk_shutdown
;
6859 newsk
->sk_destruct
= inet_sock_destruct
;
6860 newsk
->sk_family
= sk
->sk_family
;
6861 newsk
->sk_protocol
= IPPROTO_SCTP
;
6862 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
6863 newsk
->sk_sndbuf
= sk
->sk_sndbuf
;
6864 newsk
->sk_rcvbuf
= sk
->sk_rcvbuf
;
6865 newsk
->sk_lingertime
= sk
->sk_lingertime
;
6866 newsk
->sk_rcvtimeo
= sk
->sk_rcvtimeo
;
6867 newsk
->sk_sndtimeo
= sk
->sk_sndtimeo
;
6869 newinet
= inet_sk(newsk
);
6871 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6872 * getsockname() and getpeername()
6874 newinet
->inet_sport
= inet
->inet_sport
;
6875 newinet
->inet_saddr
= inet
->inet_saddr
;
6876 newinet
->inet_rcv_saddr
= inet
->inet_rcv_saddr
;
6877 newinet
->inet_dport
= htons(asoc
->peer
.port
);
6878 newinet
->pmtudisc
= inet
->pmtudisc
;
6879 newinet
->inet_id
= asoc
->next_tsn
^ jiffies
;
6881 newinet
->uc_ttl
= inet
->uc_ttl
;
6882 newinet
->mc_loop
= 1;
6883 newinet
->mc_ttl
= 1;
6884 newinet
->mc_index
= 0;
6885 newinet
->mc_list
= NULL
;
6888 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6889 * and its messages to the newsk.
6891 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
6892 struct sctp_association
*assoc
,
6893 sctp_socket_type_t type
)
6895 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
6896 struct sctp_sock
*newsp
= sctp_sk(newsk
);
6897 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
6898 struct sctp_endpoint
*newep
= newsp
->ep
;
6899 struct sk_buff
*skb
, *tmp
;
6900 struct sctp_ulpevent
*event
;
6901 struct sctp_bind_hashbucket
*head
;
6902 struct list_head tmplist
;
6904 /* Migrate socket buffer sizes and all the socket level options to the
6907 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
6908 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
6909 /* Brute force copy old sctp opt. */
6910 if (oldsp
->do_auto_asconf
) {
6911 memcpy(&tmplist
, &newsp
->auto_asconf_list
, sizeof(tmplist
));
6912 inet_sk_copy_descendant(newsk
, oldsk
);
6913 memcpy(&newsp
->auto_asconf_list
, &tmplist
, sizeof(tmplist
));
6915 inet_sk_copy_descendant(newsk
, oldsk
);
6917 /* Restore the ep value that was overwritten with the above structure
6923 /* Hook this new socket in to the bind_hash list. */
6924 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(oldsk
),
6925 inet_sk(oldsk
)->inet_num
)];
6926 sctp_local_bh_disable();
6927 sctp_spin_lock(&head
->lock
);
6928 pp
= sctp_sk(oldsk
)->bind_hash
;
6929 sk_add_bind_node(newsk
, &pp
->owner
);
6930 sctp_sk(newsk
)->bind_hash
= pp
;
6931 inet_sk(newsk
)->inet_num
= inet_sk(oldsk
)->inet_num
;
6932 sctp_spin_unlock(&head
->lock
);
6933 sctp_local_bh_enable();
6935 /* Copy the bind_addr list from the original endpoint to the new
6936 * endpoint so that we can handle restarts properly
6938 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
6939 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
6941 /* Move any messages in the old socket's receive queue that are for the
6942 * peeled off association to the new socket's receive queue.
6944 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
6945 event
= sctp_skb2event(skb
);
6946 if (event
->asoc
== assoc
) {
6947 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
6948 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
6949 sctp_skb_set_owner_r_frag(skb
, newsk
);
6953 /* Clean up any messages pending delivery due to partial
6954 * delivery. Three cases:
6955 * 1) No partial deliver; no work.
6956 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6957 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6959 skb_queue_head_init(&newsp
->pd_lobby
);
6960 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
6962 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
6963 struct sk_buff_head
*queue
;
6965 /* Decide which queue to move pd_lobby skbs to. */
6966 if (assoc
->ulpq
.pd_mode
) {
6967 queue
= &newsp
->pd_lobby
;
6969 queue
= &newsk
->sk_receive_queue
;
6971 /* Walk through the pd_lobby, looking for skbs that
6972 * need moved to the new socket.
6974 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
6975 event
= sctp_skb2event(skb
);
6976 if (event
->asoc
== assoc
) {
6977 __skb_unlink(skb
, &oldsp
->pd_lobby
);
6978 __skb_queue_tail(queue
, skb
);
6979 sctp_skb_set_owner_r_frag(skb
, newsk
);
6983 /* Clear up any skbs waiting for the partial
6984 * delivery to finish.
6986 if (assoc
->ulpq
.pd_mode
)
6987 sctp_clear_pd(oldsk
, NULL
);
6991 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
)
6992 sctp_skb_set_owner_r_frag(skb
, newsk
);
6994 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
)
6995 sctp_skb_set_owner_r_frag(skb
, newsk
);
6997 /* Set the type of socket to indicate that it is peeled off from the
6998 * original UDP-style socket or created with the accept() call on a
6999 * TCP-style socket..
7003 /* Mark the new socket "in-use" by the user so that any packets
7004 * that may arrive on the association after we've moved it are
7005 * queued to the backlog. This prevents a potential race between
7006 * backlog processing on the old socket and new-packet processing
7007 * on the new socket.
7009 * The caller has just allocated newsk so we can guarantee that other
7010 * paths won't try to lock it and then oldsk.
7012 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
7013 sctp_assoc_migrate(assoc
, newsk
);
7015 /* If the association on the newsk is already closed before accept()
7016 * is called, set RCV_SHUTDOWN flag.
7018 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
))
7019 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
7021 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
7022 sctp_release_sock(newsk
);
7026 /* This proto struct describes the ULP interface for SCTP. */
7027 struct proto sctp_prot
= {
7029 .owner
= THIS_MODULE
,
7030 .close
= sctp_close
,
7031 .connect
= sctp_connect
,
7032 .disconnect
= sctp_disconnect
,
7033 .accept
= sctp_accept
,
7034 .ioctl
= sctp_ioctl
,
7035 .init
= sctp_init_sock
,
7036 .destroy
= sctp_destroy_sock
,
7037 .shutdown
= sctp_shutdown
,
7038 .setsockopt
= sctp_setsockopt
,
7039 .getsockopt
= sctp_getsockopt
,
7040 .sendmsg
= sctp_sendmsg
,
7041 .recvmsg
= sctp_recvmsg
,
7043 .backlog_rcv
= sctp_backlog_rcv
,
7045 .unhash
= sctp_unhash
,
7046 .get_port
= sctp_get_port
,
7047 .obj_size
= sizeof(struct sctp_sock
),
7048 .sysctl_mem
= sysctl_sctp_mem
,
7049 .sysctl_rmem
= sysctl_sctp_rmem
,
7050 .sysctl_wmem
= sysctl_sctp_wmem
,
7051 .memory_pressure
= &sctp_memory_pressure
,
7052 .enter_memory_pressure
= sctp_enter_memory_pressure
,
7053 .memory_allocated
= &sctp_memory_allocated
,
7054 .sockets_allocated
= &sctp_sockets_allocated
,
7057 #if IS_ENABLED(CONFIG_IPV6)
7059 struct proto sctpv6_prot
= {
7061 .owner
= THIS_MODULE
,
7062 .close
= sctp_close
,
7063 .connect
= sctp_connect
,
7064 .disconnect
= sctp_disconnect
,
7065 .accept
= sctp_accept
,
7066 .ioctl
= sctp_ioctl
,
7067 .init
= sctp_init_sock
,
7068 .destroy
= sctp_destroy_sock
,
7069 .shutdown
= sctp_shutdown
,
7070 .setsockopt
= sctp_setsockopt
,
7071 .getsockopt
= sctp_getsockopt
,
7072 .sendmsg
= sctp_sendmsg
,
7073 .recvmsg
= sctp_recvmsg
,
7075 .backlog_rcv
= sctp_backlog_rcv
,
7077 .unhash
= sctp_unhash
,
7078 .get_port
= sctp_get_port
,
7079 .obj_size
= sizeof(struct sctp6_sock
),
7080 .sysctl_mem
= sysctl_sctp_mem
,
7081 .sysctl_rmem
= sysctl_sctp_rmem
,
7082 .sysctl_wmem
= sysctl_sctp_wmem
,
7083 .memory_pressure
= &sctp_memory_pressure
,
7084 .enter_memory_pressure
= sctp_enter_memory_pressure
,
7085 .memory_allocated
= &sctp_memory_allocated
,
7086 .sockets_allocated
= &sctp_sockets_allocated
,
7088 #endif /* IS_ENABLED(CONFIG_IPV6) */