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, see
32 * <http://www.gnu.org/licenses/>.
34 * Please send any bug reports or fixes you make to the
36 * lksctp developers <linux-sctp@vger.kernel.org>
38 * Written or modified by:
39 * La Monte H.P. Yarroll <piggy@acm.org>
40 * Narasimha Budihal <narsi@refcode.org>
41 * Karl Knutson <karl@athena.chicago.il.us>
42 * Jon Grimm <jgrimm@us.ibm.com>
43 * Xingang Guo <xingang.guo@intel.com>
44 * Daisy Chang <daisyc@us.ibm.com>
45 * Sridhar Samudrala <samudrala@us.ibm.com>
46 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
47 * Ardelle Fan <ardelle.fan@intel.com>
48 * Ryan Layer <rmlayer@us.ibm.com>
49 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
50 * Kevin Gao <kevin.gao@intel.com>
53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
55 #include <crypto/hash.h>
56 #include <linux/types.h>
57 #include <linux/kernel.h>
58 #include <linux/wait.h>
59 #include <linux/time.h>
61 #include <linux/capability.h>
62 #include <linux/fcntl.h>
63 #include <linux/poll.h>
64 #include <linux/init.h>
65 #include <linux/slab.h>
66 #include <linux/file.h>
67 #include <linux/compat.h>
71 #include <net/route.h>
73 #include <net/inet_common.h>
74 #include <net/busy_poll.h>
76 #include <linux/socket.h> /* for sa_family_t */
77 #include <linux/export.h>
79 #include <net/sctp/sctp.h>
80 #include <net/sctp/sm.h>
82 /* Forward declarations for internal helper functions. */
83 static int sctp_writeable(struct sock
*sk
);
84 static void sctp_wfree(struct sk_buff
*skb
);
85 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
87 static int sctp_wait_for_packet(struct sock
*sk
, int *err
, long *timeo_p
);
88 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
89 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
90 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
91 static void sctp_destruct_sock(struct sock
*sk
);
92 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
93 union sctp_addr
*addr
, int len
);
94 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
95 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
96 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
97 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
98 static int sctp_send_asconf(struct sctp_association
*asoc
,
99 struct sctp_chunk
*chunk
);
100 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
101 static int sctp_autobind(struct sock
*sk
);
102 static void sctp_sock_migrate(struct sock
*, struct sock
*,
103 struct sctp_association
*, sctp_socket_type_t
);
105 static int sctp_memory_pressure
;
106 static atomic_long_t sctp_memory_allocated
;
107 struct percpu_counter sctp_sockets_allocated
;
109 static void sctp_enter_memory_pressure(struct sock
*sk
)
111 sctp_memory_pressure
= 1;
115 /* Get the sndbuf space available at the time on the association. */
116 static inline int sctp_wspace(struct sctp_association
*asoc
)
120 if (asoc
->ep
->sndbuf_policy
)
121 amt
= asoc
->sndbuf_used
;
123 amt
= sk_wmem_alloc_get(asoc
->base
.sk
);
125 if (amt
>= asoc
->base
.sk
->sk_sndbuf
) {
126 if (asoc
->base
.sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)
129 amt
= sk_stream_wspace(asoc
->base
.sk
);
134 amt
= asoc
->base
.sk
->sk_sndbuf
- amt
;
139 /* Increment the used sndbuf space count of the corresponding association by
140 * the size of the outgoing data chunk.
141 * Also, set the skb destructor for sndbuf accounting later.
143 * Since it is always 1-1 between chunk and skb, and also a new skb is always
144 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
145 * destructor in the data chunk skb for the purpose of the sndbuf space
148 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
150 struct sctp_association
*asoc
= chunk
->asoc
;
151 struct sock
*sk
= asoc
->base
.sk
;
153 /* The sndbuf space is tracked per association. */
154 sctp_association_hold(asoc
);
156 skb_set_owner_w(chunk
->skb
, sk
);
158 chunk
->skb
->destructor
= sctp_wfree
;
159 /* Save the chunk pointer in skb for sctp_wfree to use later. */
160 skb_shinfo(chunk
->skb
)->destructor_arg
= chunk
;
162 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
163 sizeof(struct sk_buff
) +
164 sizeof(struct sctp_chunk
);
166 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
167 sk
->sk_wmem_queued
+= chunk
->skb
->truesize
;
168 sk_mem_charge(sk
, chunk
->skb
->truesize
);
171 /* Verify that this is a valid address. */
172 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
177 /* Verify basic sockaddr. */
178 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
182 /* Is this a valid SCTP address? */
183 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
186 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
192 /* Look up the association by its id. If this is not a UDP-style
193 * socket, the ID field is always ignored.
195 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
197 struct sctp_association
*asoc
= NULL
;
199 /* If this is not a UDP-style socket, assoc id should be ignored. */
200 if (!sctp_style(sk
, UDP
)) {
201 /* Return NULL if the socket state is not ESTABLISHED. It
202 * could be a TCP-style listening socket or a socket which
203 * hasn't yet called connect() to establish an association.
205 if (!sctp_sstate(sk
, ESTABLISHED
) && !sctp_sstate(sk
, CLOSING
))
208 /* Get the first and the only association from the list. */
209 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
210 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
211 struct sctp_association
, asocs
);
215 /* Otherwise this is a UDP-style socket. */
216 if (!id
|| (id
== (sctp_assoc_t
)-1))
219 spin_lock_bh(&sctp_assocs_id_lock
);
220 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
221 spin_unlock_bh(&sctp_assocs_id_lock
);
223 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
229 /* Look up the transport from an address and an assoc id. If both address and
230 * id are specified, the associations matching the address and the id should be
233 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
234 struct sockaddr_storage
*addr
,
237 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
238 struct sctp_af
*af
= sctp_get_af_specific(addr
->ss_family
);
239 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
240 struct sctp_transport
*transport
;
242 if (!af
|| sctp_verify_addr(sk
, laddr
, af
->sockaddr_len
))
245 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
252 id_asoc
= sctp_id2assoc(sk
, id
);
253 if (id_asoc
&& (id_asoc
!= addr_asoc
))
256 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sctp_sk(sk
),
257 (union sctp_addr
*)addr
);
262 /* API 3.1.2 bind() - UDP Style Syntax
263 * The syntax of bind() is,
265 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
267 * sd - the socket descriptor returned by socket().
268 * addr - the address structure (struct sockaddr_in or struct
269 * sockaddr_in6 [RFC 2553]),
270 * addr_len - the size of the address structure.
272 static int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
278 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__
, sk
,
281 /* Disallow binding twice. */
282 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
283 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
293 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
295 /* Verify this is a valid sockaddr. */
296 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
297 union sctp_addr
*addr
, int len
)
301 /* Check minimum size. */
302 if (len
< sizeof (struct sockaddr
))
305 /* V4 mapped address are really of AF_INET family */
306 if (addr
->sa
.sa_family
== AF_INET6
&&
307 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
)) {
308 if (!opt
->pf
->af_supported(AF_INET
, opt
))
311 /* Does this PF support this AF? */
312 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
316 /* If we get this far, af is valid. */
317 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
319 if (len
< af
->sockaddr_len
)
325 /* Bind a local address either to an endpoint or to an association. */
326 static int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
328 struct net
*net
= sock_net(sk
);
329 struct sctp_sock
*sp
= sctp_sk(sk
);
330 struct sctp_endpoint
*ep
= sp
->ep
;
331 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
336 /* Common sockaddr verification. */
337 af
= sctp_sockaddr_af(sp
, addr
, len
);
339 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
340 __func__
, sk
, addr
, len
);
344 snum
= ntohs(addr
->v4
.sin_port
);
346 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
347 __func__
, sk
, &addr
->sa
, bp
->port
, snum
, len
);
349 /* PF specific bind() address verification. */
350 if (!sp
->pf
->bind_verify(sp
, addr
))
351 return -EADDRNOTAVAIL
;
353 /* We must either be unbound, or bind to the same port.
354 * It's OK to allow 0 ports if we are already bound.
355 * We'll just inhert an already bound port in this case
360 else if (snum
!= bp
->port
) {
361 pr_debug("%s: new port %d doesn't match existing port "
362 "%d\n", __func__
, snum
, bp
->port
);
367 if (snum
&& snum
< inet_prot_sock(net
) &&
368 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
))
371 /* See if the address matches any of the addresses we may have
372 * already bound before checking against other endpoints.
374 if (sctp_bind_addr_match(bp
, addr
, sp
))
377 /* Make sure we are allowed to bind here.
378 * The function sctp_get_port_local() does duplicate address
381 addr
->v4
.sin_port
= htons(snum
);
382 if ((ret
= sctp_get_port_local(sk
, addr
))) {
386 /* Refresh ephemeral port. */
388 bp
->port
= inet_sk(sk
)->inet_num
;
390 /* Add the address to the bind address list.
391 * Use GFP_ATOMIC since BHs will be disabled.
393 ret
= sctp_add_bind_addr(bp
, addr
, af
->sockaddr_len
,
394 SCTP_ADDR_SRC
, GFP_ATOMIC
);
396 /* Copy back into socket for getsockname() use. */
398 inet_sk(sk
)->inet_sport
= htons(inet_sk(sk
)->inet_num
);
399 sp
->pf
->to_sk_saddr(addr
, sk
);
405 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
407 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
408 * at any one time. If a sender, after sending an ASCONF chunk, decides
409 * it needs to transfer another ASCONF Chunk, it MUST wait until the
410 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
411 * subsequent ASCONF. Note this restriction binds each side, so at any
412 * time two ASCONF may be in-transit on any given association (one sent
413 * from each endpoint).
415 static int sctp_send_asconf(struct sctp_association
*asoc
,
416 struct sctp_chunk
*chunk
)
418 struct net
*net
= sock_net(asoc
->base
.sk
);
421 /* If there is an outstanding ASCONF chunk, queue it for later
424 if (asoc
->addip_last_asconf
) {
425 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
429 /* Hold the chunk until an ASCONF_ACK is received. */
430 sctp_chunk_hold(chunk
);
431 retval
= sctp_primitive_ASCONF(net
, asoc
, chunk
);
433 sctp_chunk_free(chunk
);
435 asoc
->addip_last_asconf
= chunk
;
441 /* Add a list of addresses as bind addresses to local endpoint or
444 * Basically run through each address specified in the addrs/addrcnt
445 * array/length pair, determine if it is IPv6 or IPv4 and call
446 * sctp_do_bind() on it.
448 * If any of them fails, then the operation will be reversed and the
449 * ones that were added will be removed.
451 * Only sctp_setsockopt_bindx() is supposed to call this function.
453 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
458 struct sockaddr
*sa_addr
;
461 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__
, sk
,
465 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
466 /* The list may contain either IPv4 or IPv6 address;
467 * determine the address length for walking thru the list.
470 af
= sctp_get_af_specific(sa_addr
->sa_family
);
476 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
479 addr_buf
+= af
->sockaddr_len
;
483 /* Failed. Cleanup the ones that have been added */
485 sctp_bindx_rem(sk
, addrs
, cnt
);
493 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
494 * associations that are part of the endpoint indicating that a list of local
495 * addresses are added to the endpoint.
497 * If any of the addresses is already in the bind address list of the
498 * association, we do not send the chunk for that association. But it will not
499 * affect other associations.
501 * Only sctp_setsockopt_bindx() is supposed to call this function.
503 static int sctp_send_asconf_add_ip(struct sock
*sk
,
504 struct sockaddr
*addrs
,
507 struct net
*net
= sock_net(sk
);
508 struct sctp_sock
*sp
;
509 struct sctp_endpoint
*ep
;
510 struct sctp_association
*asoc
;
511 struct sctp_bind_addr
*bp
;
512 struct sctp_chunk
*chunk
;
513 struct sctp_sockaddr_entry
*laddr
;
514 union sctp_addr
*addr
;
515 union sctp_addr saveaddr
;
522 if (!net
->sctp
.addip_enable
)
528 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
529 __func__
, sk
, addrs
, addrcnt
);
531 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
532 if (!asoc
->peer
.asconf_capable
)
535 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
538 if (!sctp_state(asoc
, ESTABLISHED
))
541 /* Check if any address in the packed array of addresses is
542 * in the bind address list of the association. If so,
543 * do not send the asconf chunk to its peer, but continue with
544 * other associations.
547 for (i
= 0; i
< addrcnt
; i
++) {
549 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
555 if (sctp_assoc_lookup_laddr(asoc
, addr
))
558 addr_buf
+= af
->sockaddr_len
;
563 /* Use the first valid address in bind addr list of
564 * association as Address Parameter of ASCONF CHUNK.
566 bp
= &asoc
->base
.bind_addr
;
567 p
= bp
->address_list
.next
;
568 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
569 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
570 addrcnt
, SCTP_PARAM_ADD_IP
);
576 /* Add the new addresses to the bind address list with
577 * use_as_src set to 0.
580 for (i
= 0; i
< addrcnt
; i
++) {
582 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
583 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
584 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
586 SCTP_ADDR_NEW
, GFP_ATOMIC
);
587 addr_buf
+= af
->sockaddr_len
;
589 if (asoc
->src_out_of_asoc_ok
) {
590 struct sctp_transport
*trans
;
592 list_for_each_entry(trans
,
593 &asoc
->peer
.transport_addr_list
, transports
) {
594 /* Clear the source and route cache */
595 sctp_transport_dst_release(trans
);
596 trans
->cwnd
= min(4*asoc
->pathmtu
, max_t(__u32
,
597 2*asoc
->pathmtu
, 4380));
598 trans
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
599 trans
->rto
= asoc
->rto_initial
;
600 sctp_max_rto(asoc
, trans
);
601 trans
->rtt
= trans
->srtt
= trans
->rttvar
= 0;
602 sctp_transport_route(trans
, NULL
,
603 sctp_sk(asoc
->base
.sk
));
606 retval
= sctp_send_asconf(asoc
, chunk
);
613 /* Remove a list of addresses from bind addresses list. Do not remove the
616 * Basically run through each address specified in the addrs/addrcnt
617 * array/length pair, determine if it is IPv6 or IPv4 and call
618 * sctp_del_bind() on it.
620 * If any of them fails, then the operation will be reversed and the
621 * ones that were removed will be added back.
623 * At least one address has to be left; if only one address is
624 * available, the operation will return -EBUSY.
626 * Only sctp_setsockopt_bindx() is supposed to call this function.
628 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
630 struct sctp_sock
*sp
= sctp_sk(sk
);
631 struct sctp_endpoint
*ep
= sp
->ep
;
633 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
636 union sctp_addr
*sa_addr
;
639 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
640 __func__
, sk
, addrs
, addrcnt
);
643 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
644 /* If the bind address list is empty or if there is only one
645 * bind address, there is nothing more to be removed (we need
646 * at least one address here).
648 if (list_empty(&bp
->address_list
) ||
649 (sctp_list_single_entry(&bp
->address_list
))) {
655 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
661 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
662 retval
= -EADDRNOTAVAIL
;
666 if (sa_addr
->v4
.sin_port
&&
667 sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
672 if (!sa_addr
->v4
.sin_port
)
673 sa_addr
->v4
.sin_port
= htons(bp
->port
);
675 /* FIXME - There is probably a need to check if sk->sk_saddr and
676 * sk->sk_rcv_addr are currently set to one of the addresses to
677 * be removed. This is something which needs to be looked into
678 * when we are fixing the outstanding issues with multi-homing
679 * socket routing and failover schemes. Refer to comments in
680 * sctp_do_bind(). -daisy
682 retval
= sctp_del_bind_addr(bp
, sa_addr
);
684 addr_buf
+= af
->sockaddr_len
;
687 /* Failed. Add the ones that has been removed back */
689 sctp_bindx_add(sk
, addrs
, cnt
);
697 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
698 * the associations that are part of the endpoint indicating that a list of
699 * local addresses are removed from the endpoint.
701 * If any of the addresses is already in the bind address list of the
702 * association, we do not send the chunk for that association. But it will not
703 * affect other associations.
705 * Only sctp_setsockopt_bindx() is supposed to call this function.
707 static int sctp_send_asconf_del_ip(struct sock
*sk
,
708 struct sockaddr
*addrs
,
711 struct net
*net
= sock_net(sk
);
712 struct sctp_sock
*sp
;
713 struct sctp_endpoint
*ep
;
714 struct sctp_association
*asoc
;
715 struct sctp_transport
*transport
;
716 struct sctp_bind_addr
*bp
;
717 struct sctp_chunk
*chunk
;
718 union sctp_addr
*laddr
;
721 struct sctp_sockaddr_entry
*saddr
;
727 if (!net
->sctp
.addip_enable
)
733 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
734 __func__
, sk
, addrs
, addrcnt
);
736 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
738 if (!asoc
->peer
.asconf_capable
)
741 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
744 if (!sctp_state(asoc
, ESTABLISHED
))
747 /* Check if any address in the packed array of addresses is
748 * not present in the bind address list of the association.
749 * If so, do not send the asconf chunk to its peer, but
750 * continue with other associations.
753 for (i
= 0; i
< addrcnt
; i
++) {
755 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
761 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
764 addr_buf
+= af
->sockaddr_len
;
769 /* Find one address in the association's bind address list
770 * that is not in the packed array of addresses. This is to
771 * make sure that we do not delete all the addresses in the
774 bp
= &asoc
->base
.bind_addr
;
775 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
777 if ((laddr
== NULL
) && (addrcnt
== 1)) {
778 if (asoc
->asconf_addr_del_pending
)
780 asoc
->asconf_addr_del_pending
=
781 kzalloc(sizeof(union sctp_addr
), GFP_ATOMIC
);
782 if (asoc
->asconf_addr_del_pending
== NULL
) {
786 asoc
->asconf_addr_del_pending
->sa
.sa_family
=
788 asoc
->asconf_addr_del_pending
->v4
.sin_port
=
790 if (addrs
->sa_family
== AF_INET
) {
791 struct sockaddr_in
*sin
;
793 sin
= (struct sockaddr_in
*)addrs
;
794 asoc
->asconf_addr_del_pending
->v4
.sin_addr
.s_addr
= sin
->sin_addr
.s_addr
;
795 } else if (addrs
->sa_family
== AF_INET6
) {
796 struct sockaddr_in6
*sin6
;
798 sin6
= (struct sockaddr_in6
*)addrs
;
799 asoc
->asconf_addr_del_pending
->v6
.sin6_addr
= sin6
->sin6_addr
;
802 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
803 __func__
, asoc
, &asoc
->asconf_addr_del_pending
->sa
,
804 asoc
->asconf_addr_del_pending
);
806 asoc
->src_out_of_asoc_ok
= 1;
814 /* We do not need RCU protection throughout this loop
815 * because this is done under a socket lock from the
818 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
826 /* Reset use_as_src flag for the addresses in the bind address
827 * list that are to be deleted.
830 for (i
= 0; i
< addrcnt
; i
++) {
832 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
833 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
834 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
835 saddr
->state
= SCTP_ADDR_DEL
;
837 addr_buf
+= af
->sockaddr_len
;
840 /* Update the route and saddr entries for all the transports
841 * as some of the addresses in the bind address list are
842 * about to be deleted and cannot be used as source addresses.
844 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
846 sctp_transport_dst_release(transport
);
847 sctp_transport_route(transport
, NULL
,
848 sctp_sk(asoc
->base
.sk
));
852 /* We don't need to transmit ASCONF */
854 retval
= sctp_send_asconf(asoc
, chunk
);
860 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
861 int sctp_asconf_mgmt(struct sctp_sock
*sp
, struct sctp_sockaddr_entry
*addrw
)
863 struct sock
*sk
= sctp_opt2sk(sp
);
864 union sctp_addr
*addr
;
867 /* It is safe to write port space in caller. */
869 addr
->v4
.sin_port
= htons(sp
->ep
->base
.bind_addr
.port
);
870 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
873 if (sctp_verify_addr(sk
, addr
, af
->sockaddr_len
))
876 if (addrw
->state
== SCTP_ADDR_NEW
)
877 return sctp_send_asconf_add_ip(sk
, (struct sockaddr
*)addr
, 1);
879 return sctp_send_asconf_del_ip(sk
, (struct sockaddr
*)addr
, 1);
882 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
885 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
888 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
889 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
892 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
893 * Section 3.1.2 for this usage.
895 * addrs is a pointer to an array of one or more socket addresses. Each
896 * address is contained in its appropriate structure (i.e. struct
897 * sockaddr_in or struct sockaddr_in6) the family of the address type
898 * must be used to distinguish the address length (note that this
899 * representation is termed a "packed array" of addresses). The caller
900 * specifies the number of addresses in the array with addrcnt.
902 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
903 * -1, and sets errno to the appropriate error code.
905 * For SCTP, the port given in each socket address must be the same, or
906 * sctp_bindx() will fail, setting errno to EINVAL.
908 * The flags parameter is formed from the bitwise OR of zero or more of
909 * the following currently defined flags:
911 * SCTP_BINDX_ADD_ADDR
913 * SCTP_BINDX_REM_ADDR
915 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
916 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
917 * addresses from the association. The two flags are mutually exclusive;
918 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
919 * not remove all addresses from an association; sctp_bindx() will
920 * reject such an attempt with EINVAL.
922 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
923 * additional addresses with an endpoint after calling bind(). Or use
924 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
925 * socket is associated with so that no new association accepted will be
926 * associated with those addresses. If the endpoint supports dynamic
927 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
928 * endpoint to send the appropriate message to the peer to change the
929 * peers address lists.
931 * Adding and removing addresses from a connected association is
932 * optional functionality. Implementations that do not support this
933 * functionality should return EOPNOTSUPP.
935 * Basically do nothing but copying the addresses from user to kernel
936 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
937 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
940 * We don't use copy_from_user() for optimization: we first do the
941 * sanity checks (buffer size -fast- and access check-healthy
942 * pointer); if all of those succeed, then we can alloc the memory
943 * (expensive operation) needed to copy the data to kernel. Then we do
944 * the copying without checking the user space area
945 * (__copy_from_user()).
947 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
950 * sk The sk of the socket
951 * addrs The pointer to the addresses in user land
952 * addrssize Size of the addrs buffer
953 * op Operation to perform (add or remove, see the flags of
956 * Returns 0 if ok, <0 errno code on error.
958 static int sctp_setsockopt_bindx(struct sock
*sk
,
959 struct sockaddr __user
*addrs
,
960 int addrs_size
, int op
)
962 struct sockaddr
*kaddrs
;
966 struct sockaddr
*sa_addr
;
970 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
971 __func__
, sk
, addrs
, addrs_size
, op
);
973 if (unlikely(addrs_size
<= 0))
976 /* Check the user passed a healthy pointer. */
977 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
980 /* Alloc space for the address array in kernel memory. */
981 kaddrs
= kmalloc(addrs_size
, GFP_USER
| __GFP_NOWARN
);
982 if (unlikely(!kaddrs
))
985 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
990 /* Walk through the addrs buffer and count the number of addresses. */
992 while (walk_size
< addrs_size
) {
993 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
999 af
= sctp_get_af_specific(sa_addr
->sa_family
);
1001 /* If the address family is not supported or if this address
1002 * causes the address buffer to overflow return EINVAL.
1004 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1009 addr_buf
+= af
->sockaddr_len
;
1010 walk_size
+= af
->sockaddr_len
;
1015 case SCTP_BINDX_ADD_ADDR
:
1016 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
1019 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
1022 case SCTP_BINDX_REM_ADDR
:
1023 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
1026 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
1040 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1042 * Common routine for handling connect() and sctp_connectx().
1043 * Connect will come in with just a single address.
1045 static int __sctp_connect(struct sock
*sk
,
1046 struct sockaddr
*kaddrs
,
1048 sctp_assoc_t
*assoc_id
)
1050 struct net
*net
= sock_net(sk
);
1051 struct sctp_sock
*sp
;
1052 struct sctp_endpoint
*ep
;
1053 struct sctp_association
*asoc
= NULL
;
1054 struct sctp_association
*asoc2
;
1055 struct sctp_transport
*transport
;
1062 union sctp_addr
*sa_addr
= NULL
;
1064 unsigned short port
;
1065 unsigned int f_flags
= 0;
1070 /* connect() cannot be done on a socket that is already in ESTABLISHED
1071 * state - UDP-style peeled off socket or a TCP-style socket that
1072 * is already connected.
1073 * It cannot be done even on a TCP-style listening socket.
1075 if (sctp_sstate(sk
, ESTABLISHED
) || sctp_sstate(sk
, CLOSING
) ||
1076 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
1081 /* Walk through the addrs buffer and count the number of addresses. */
1083 while (walk_size
< addrs_size
) {
1086 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1092 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1094 /* If the address family is not supported or if this address
1095 * causes the address buffer to overflow return EINVAL.
1097 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1102 port
= ntohs(sa_addr
->v4
.sin_port
);
1104 /* Save current address so we can work with it */
1105 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1107 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1111 /* Make sure the destination port is correctly set
1114 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
) {
1119 /* Check if there already is a matching association on the
1120 * endpoint (other than the one created here).
1122 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1123 if (asoc2
&& asoc2
!= asoc
) {
1124 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1131 /* If we could not find a matching association on the endpoint,
1132 * make sure that there is no peeled-off association matching
1133 * the peer address even on another socket.
1135 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1136 err
= -EADDRNOTAVAIL
;
1141 /* If a bind() or sctp_bindx() is not called prior to
1142 * an sctp_connectx() call, the system picks an
1143 * ephemeral port and will choose an address set
1144 * equivalent to binding with a wildcard address.
1146 if (!ep
->base
.bind_addr
.port
) {
1147 if (sctp_autobind(sk
)) {
1153 * If an unprivileged user inherits a 1-many
1154 * style socket with open associations on a
1155 * privileged port, it MAY be permitted to
1156 * accept new associations, but it SHOULD NOT
1157 * be permitted to open new associations.
1159 if (ep
->base
.bind_addr
.port
<
1160 inet_prot_sock(net
) &&
1161 !ns_capable(net
->user_ns
,
1162 CAP_NET_BIND_SERVICE
)) {
1168 scope
= sctp_scope(&to
);
1169 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1175 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
,
1183 /* Prime the peer's transport structures. */
1184 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1192 addr_buf
+= af
->sockaddr_len
;
1193 walk_size
+= af
->sockaddr_len
;
1196 /* In case the user of sctp_connectx() wants an association
1197 * id back, assign one now.
1200 err
= sctp_assoc_set_id(asoc
, GFP_KERNEL
);
1205 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1210 /* Initialize sk's dport and daddr for getpeername() */
1211 inet_sk(sk
)->inet_dport
= htons(asoc
->peer
.port
);
1212 sp
->pf
->to_sk_daddr(sa_addr
, sk
);
1215 /* in-kernel sockets don't generally have a file allocated to them
1216 * if all they do is call sock_create_kern().
1218 if (sk
->sk_socket
->file
)
1219 f_flags
= sk
->sk_socket
->file
->f_flags
;
1221 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1224 *assoc_id
= asoc
->assoc_id
;
1225 err
= sctp_wait_for_connect(asoc
, &timeo
);
1226 /* Note: the asoc may be freed after the return of
1227 * sctp_wait_for_connect.
1230 /* Don't free association on exit. */
1234 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1235 __func__
, asoc
, kaddrs
, err
);
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_association_free(asoc
);
1247 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1250 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1251 * sctp_assoc_t *asoc);
1253 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1254 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1255 * or IPv6 addresses.
1257 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1258 * Section 3.1.2 for this usage.
1260 * addrs is a pointer to an array of one or more socket addresses. Each
1261 * address is contained in its appropriate structure (i.e. struct
1262 * sockaddr_in or struct sockaddr_in6) the family of the address type
1263 * must be used to distengish the address length (note that this
1264 * representation is termed a "packed array" of addresses). The caller
1265 * specifies the number of addresses in the array with addrcnt.
1267 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1268 * the association id of the new association. On failure, sctp_connectx()
1269 * returns -1, and sets errno to the appropriate error code. The assoc_id
1270 * is not touched by the kernel.
1272 * For SCTP, the port given in each socket address must be the same, or
1273 * sctp_connectx() will fail, setting errno to EINVAL.
1275 * An application can use sctp_connectx to initiate an association with
1276 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1277 * allows a caller to specify multiple addresses at which a peer can be
1278 * reached. The way the SCTP stack uses the list of addresses to set up
1279 * the association is implementation dependent. This function only
1280 * specifies that the stack will try to make use of all the addresses in
1281 * the list when needed.
1283 * Note that the list of addresses passed in is only used for setting up
1284 * the association. It does not necessarily equal the set of addresses
1285 * the peer uses for the resulting association. If the caller wants to
1286 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1287 * retrieve them after the association has been set up.
1289 * Basically do nothing but copying the addresses from user to kernel
1290 * land and invoking either sctp_connectx(). This is used for tunneling
1291 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1293 * We don't use copy_from_user() for optimization: we first do the
1294 * sanity checks (buffer size -fast- and access check-healthy
1295 * pointer); if all of those succeed, then we can alloc the memory
1296 * (expensive operation) needed to copy the data to kernel. Then we do
1297 * the copying without checking the user space area
1298 * (__copy_from_user()).
1300 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1303 * sk The sk of the socket
1304 * addrs The pointer to the addresses in user land
1305 * addrssize Size of the addrs buffer
1307 * Returns >=0 if ok, <0 errno code on error.
1309 static int __sctp_setsockopt_connectx(struct sock
*sk
,
1310 struct sockaddr __user
*addrs
,
1312 sctp_assoc_t
*assoc_id
)
1314 struct sockaddr
*kaddrs
;
1315 gfp_t gfp
= GFP_KERNEL
;
1318 pr_debug("%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 if (sk
->sk_socket
->file
)
1330 gfp
= GFP_USER
| __GFP_NOWARN
;
1331 kaddrs
= kmalloc(addrs_size
, gfp
);
1332 if (unlikely(!kaddrs
))
1335 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1338 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, assoc_id
);
1347 * This is an older interface. It's kept for backward compatibility
1348 * to the option that doesn't provide association id.
1350 static int sctp_setsockopt_connectx_old(struct sock
*sk
,
1351 struct sockaddr __user
*addrs
,
1354 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1358 * New interface for the API. The since the API is done with a socket
1359 * option, to make it simple we feed back the association id is as a return
1360 * indication to the call. Error is always negative and association id is
1363 static int sctp_setsockopt_connectx(struct sock
*sk
,
1364 struct sockaddr __user
*addrs
,
1367 sctp_assoc_t assoc_id
= 0;
1370 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1379 * New (hopefully final) interface for the API.
1380 * We use the sctp_getaddrs_old structure so that use-space library
1381 * can avoid any unnecessary allocations. The only different part
1382 * is that we store the actual length of the address buffer into the
1383 * addrs_num structure member. That way we can re-use the existing
1386 #ifdef CONFIG_COMPAT
1387 struct compat_sctp_getaddrs_old
{
1388 sctp_assoc_t assoc_id
;
1390 compat_uptr_t addrs
; /* struct sockaddr * */
1394 static int sctp_getsockopt_connectx3(struct sock
*sk
, int len
,
1395 char __user
*optval
,
1398 struct sctp_getaddrs_old param
;
1399 sctp_assoc_t assoc_id
= 0;
1402 #ifdef CONFIG_COMPAT
1403 if (in_compat_syscall()) {
1404 struct compat_sctp_getaddrs_old param32
;
1406 if (len
< sizeof(param32
))
1408 if (copy_from_user(¶m32
, optval
, sizeof(param32
)))
1411 param
.assoc_id
= param32
.assoc_id
;
1412 param
.addr_num
= param32
.addr_num
;
1413 param
.addrs
= compat_ptr(param32
.addrs
);
1417 if (len
< sizeof(param
))
1419 if (copy_from_user(¶m
, optval
, sizeof(param
)))
1423 err
= __sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)
1424 param
.addrs
, param
.addr_num
,
1426 if (err
== 0 || err
== -EINPROGRESS
) {
1427 if (copy_to_user(optval
, &assoc_id
, sizeof(assoc_id
)))
1429 if (put_user(sizeof(assoc_id
), optlen
))
1436 /* API 3.1.4 close() - UDP Style Syntax
1437 * Applications use close() to perform graceful shutdown (as described in
1438 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1439 * by a UDP-style socket.
1443 * ret = close(int sd);
1445 * sd - the socket descriptor of the associations to be closed.
1447 * To gracefully shutdown a specific association represented by the
1448 * UDP-style socket, an application should use the sendmsg() call,
1449 * passing no user data, but including the appropriate flag in the
1450 * ancillary data (see Section xxxx).
1452 * If sd in the close() call is a branched-off socket representing only
1453 * one association, the shutdown is performed on that association only.
1455 * 4.1.6 close() - TCP Style Syntax
1457 * Applications use close() to gracefully close down an association.
1461 * int close(int sd);
1463 * sd - the socket descriptor of the association to be closed.
1465 * After an application calls close() on a socket descriptor, no further
1466 * socket operations will succeed on that descriptor.
1468 * API 7.1.4 SO_LINGER
1470 * An application using the TCP-style socket can use this option to
1471 * perform the SCTP ABORT primitive. The linger option structure is:
1474 * int l_onoff; // option on/off
1475 * int l_linger; // linger time
1478 * To enable the option, set l_onoff to 1. If the l_linger value is set
1479 * to 0, calling close() is the same as the ABORT primitive. If the
1480 * value is set to a negative value, the setsockopt() call will return
1481 * an error. If the value is set to a positive value linger_time, the
1482 * close() can be blocked for at most linger_time ms. If the graceful
1483 * shutdown phase does not finish during this period, close() will
1484 * return but the graceful shutdown phase continues in the system.
1486 static void sctp_close(struct sock
*sk
, long timeout
)
1488 struct net
*net
= sock_net(sk
);
1489 struct sctp_endpoint
*ep
;
1490 struct sctp_association
*asoc
;
1491 struct list_head
*pos
, *temp
;
1492 unsigned int data_was_unread
;
1494 pr_debug("%s: sk:%p, timeout:%ld\n", __func__
, sk
, timeout
);
1497 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1498 sk
->sk_state
= SCTP_SS_CLOSING
;
1500 ep
= sctp_sk(sk
)->ep
;
1502 /* Clean up any skbs sitting on the receive queue. */
1503 data_was_unread
= sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1504 data_was_unread
+= sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1506 /* Walk all associations on an endpoint. */
1507 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1508 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1510 if (sctp_style(sk
, TCP
)) {
1511 /* A closed association can still be in the list if
1512 * it belongs to a TCP-style listening socket that is
1513 * not yet accepted. If so, free it. If not, send an
1514 * ABORT or SHUTDOWN based on the linger options.
1516 if (sctp_state(asoc
, CLOSED
)) {
1517 sctp_association_free(asoc
);
1522 if (data_was_unread
|| !skb_queue_empty(&asoc
->ulpq
.lobby
) ||
1523 !skb_queue_empty(&asoc
->ulpq
.reasm
) ||
1524 (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
)) {
1525 struct sctp_chunk
*chunk
;
1527 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1528 sctp_primitive_ABORT(net
, asoc
, chunk
);
1530 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1533 /* On a TCP-style socket, block for at most linger_time if set. */
1534 if (sctp_style(sk
, TCP
) && timeout
)
1535 sctp_wait_for_close(sk
, timeout
);
1537 /* This will run the backlog queue. */
1540 /* Supposedly, no process has access to the socket, but
1541 * the net layers still may.
1542 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1543 * held and that should be grabbed before socket lock.
1545 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
1548 /* Hold the sock, since sk_common_release() will put sock_put()
1549 * and we have just a little more cleanup.
1552 sk_common_release(sk
);
1555 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
1559 SCTP_DBG_OBJCNT_DEC(sock
);
1562 /* Handle EPIPE error. */
1563 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1566 err
= sock_error(sk
) ? : -EPIPE
;
1567 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1568 send_sig(SIGPIPE
, current
, 0);
1572 /* API 3.1.3 sendmsg() - UDP Style Syntax
1574 * An application uses sendmsg() and recvmsg() calls to transmit data to
1575 * and receive data from its peer.
1577 * ssize_t sendmsg(int socket, const struct msghdr *message,
1580 * socket - the socket descriptor of the endpoint.
1581 * message - pointer to the msghdr structure which contains a single
1582 * user message and possibly some ancillary data.
1584 * See Section 5 for complete description of the data
1587 * flags - flags sent or received with the user message, see Section
1588 * 5 for complete description of the flags.
1590 * Note: This function could use a rewrite especially when explicit
1591 * connect support comes in.
1593 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1595 static int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1597 static int sctp_sendmsg(struct sock
*sk
, struct msghdr
*msg
, size_t msg_len
)
1599 struct net
*net
= sock_net(sk
);
1600 struct sctp_sock
*sp
;
1601 struct sctp_endpoint
*ep
;
1602 struct sctp_association
*new_asoc
= NULL
, *asoc
= NULL
;
1603 struct sctp_transport
*transport
, *chunk_tp
;
1604 struct sctp_chunk
*chunk
;
1606 struct sockaddr
*msg_name
= NULL
;
1607 struct sctp_sndrcvinfo default_sinfo
;
1608 struct sctp_sndrcvinfo
*sinfo
;
1609 struct sctp_initmsg
*sinit
;
1610 sctp_assoc_t associd
= 0;
1611 sctp_cmsgs_t cmsgs
= { NULL
};
1613 bool fill_sinfo_ttl
= false, wait_connect
= false;
1614 struct sctp_datamsg
*datamsg
;
1615 int msg_flags
= msg
->msg_flags
;
1616 __u16 sinfo_flags
= 0;
1624 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__
, sk
,
1627 /* We cannot send a message over a TCP-style listening socket. */
1628 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1633 /* Parse out the SCTP CMSGs. */
1634 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1636 pr_debug("%s: msghdr parse err:%x\n", __func__
, err
);
1640 /* Fetch the destination address for this packet. This
1641 * address only selects the association--it is not necessarily
1642 * the address we will send to.
1643 * For a peeled-off socket, msg_name is ignored.
1645 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1646 int msg_namelen
= msg
->msg_namelen
;
1648 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1653 if (msg_namelen
> sizeof(to
))
1654 msg_namelen
= sizeof(to
);
1655 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1656 msg_name
= msg
->msg_name
;
1660 if (cmsgs
.sinfo
!= NULL
) {
1661 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1662 default_sinfo
.sinfo_stream
= cmsgs
.sinfo
->snd_sid
;
1663 default_sinfo
.sinfo_flags
= cmsgs
.sinfo
->snd_flags
;
1664 default_sinfo
.sinfo_ppid
= cmsgs
.sinfo
->snd_ppid
;
1665 default_sinfo
.sinfo_context
= cmsgs
.sinfo
->snd_context
;
1666 default_sinfo
.sinfo_assoc_id
= cmsgs
.sinfo
->snd_assoc_id
;
1668 sinfo
= &default_sinfo
;
1669 fill_sinfo_ttl
= true;
1671 sinfo
= cmsgs
.srinfo
;
1673 /* Did the user specify SNDINFO/SNDRCVINFO? */
1675 sinfo_flags
= sinfo
->sinfo_flags
;
1676 associd
= sinfo
->sinfo_assoc_id
;
1679 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__
,
1680 msg_len
, sinfo_flags
);
1682 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1683 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1688 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1689 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1690 * If SCTP_ABORT is set, the message length could be non zero with
1691 * the msg_iov set to the user abort reason.
1693 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1694 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1699 /* If SCTP_ADDR_OVER is set, there must be an address
1700 * specified in msg_name.
1702 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1709 pr_debug("%s: about to look up association\n", __func__
);
1713 /* If a msg_name has been specified, assume this is to be used. */
1715 /* Look for a matching association on the endpoint. */
1716 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1718 /* If we could not find a matching association on the
1719 * endpoint, make sure that it is not a TCP-style
1720 * socket that already has an association or there is
1721 * no peeled-off association on another socket.
1724 ((sctp_style(sk
, TCP
) &&
1725 (sctp_sstate(sk
, ESTABLISHED
) ||
1726 sctp_sstate(sk
, CLOSING
))) ||
1727 sctp_endpoint_is_peeled_off(ep
, &to
))) {
1728 err
= -EADDRNOTAVAIL
;
1732 asoc
= sctp_id2assoc(sk
, associd
);
1740 pr_debug("%s: just looked up association:%p\n", __func__
, asoc
);
1742 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1743 * socket that has an association in CLOSED state. This can
1744 * happen when an accepted socket has an association that is
1747 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1752 if (sinfo_flags
& SCTP_EOF
) {
1753 pr_debug("%s: shutting down association:%p\n",
1756 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1760 if (sinfo_flags
& SCTP_ABORT
) {
1762 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1768 pr_debug("%s: aborting association:%p\n",
1771 sctp_primitive_ABORT(net
, asoc
, chunk
);
1777 /* Do we need to create the association? */
1779 pr_debug("%s: there is no association yet\n", __func__
);
1781 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1786 /* Check for invalid stream against the stream counts,
1787 * either the default or the user specified stream counts.
1790 if (!sinit
|| !sinit
->sinit_num_ostreams
) {
1791 /* Check against the defaults. */
1792 if (sinfo
->sinfo_stream
>=
1793 sp
->initmsg
.sinit_num_ostreams
) {
1798 /* Check against the requested. */
1799 if (sinfo
->sinfo_stream
>=
1800 sinit
->sinit_num_ostreams
) {
1808 * API 3.1.2 bind() - UDP Style Syntax
1809 * If a bind() or sctp_bindx() is not called prior to a
1810 * sendmsg() call that initiates a new association, the
1811 * system picks an ephemeral port and will choose an address
1812 * set equivalent to binding with a wildcard address.
1814 if (!ep
->base
.bind_addr
.port
) {
1815 if (sctp_autobind(sk
)) {
1821 * If an unprivileged user inherits a one-to-many
1822 * style socket with open associations on a privileged
1823 * port, it MAY be permitted to accept new associations,
1824 * but it SHOULD NOT be permitted to open new
1827 if (ep
->base
.bind_addr
.port
< inet_prot_sock(net
) &&
1828 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
)) {
1834 scope
= sctp_scope(&to
);
1835 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1841 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
, GFP_KERNEL
);
1847 /* If the SCTP_INIT ancillary data is specified, set all
1848 * the association init values accordingly.
1851 if (sinit
->sinit_num_ostreams
) {
1852 asoc
->c
.sinit_num_ostreams
=
1853 sinit
->sinit_num_ostreams
;
1855 if (sinit
->sinit_max_instreams
) {
1856 asoc
->c
.sinit_max_instreams
=
1857 sinit
->sinit_max_instreams
;
1859 if (sinit
->sinit_max_attempts
) {
1860 asoc
->max_init_attempts
1861 = sinit
->sinit_max_attempts
;
1863 if (sinit
->sinit_max_init_timeo
) {
1864 asoc
->max_init_timeo
=
1865 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1869 /* Prime the peer's transport structures. */
1870 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1877 /* ASSERT: we have a valid association at this point. */
1878 pr_debug("%s: we have a valid association\n", __func__
);
1881 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1882 * one with some defaults.
1884 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1885 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1886 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1887 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1888 default_sinfo
.sinfo_context
= asoc
->default_context
;
1889 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1890 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1892 sinfo
= &default_sinfo
;
1893 } else if (fill_sinfo_ttl
) {
1894 /* In case SNDINFO was specified, we still need to fill
1895 * it with a default ttl from the assoc here.
1897 sinfo
->sinfo_timetolive
= asoc
->default_timetolive
;
1900 /* API 7.1.7, the sndbuf size per association bounds the
1901 * maximum size of data that can be sent in a single send call.
1903 if (msg_len
> sk
->sk_sndbuf
) {
1908 if (asoc
->pmtu_pending
)
1909 sctp_assoc_pending_pmtu(sk
, asoc
);
1911 /* If fragmentation is disabled and the message length exceeds the
1912 * association fragmentation point, return EMSGSIZE. The I-D
1913 * does not specify what this error is, but this looks like
1916 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1921 /* Check for invalid stream. */
1922 if (sinfo
->sinfo_stream
>= asoc
->c
.sinit_num_ostreams
) {
1927 if (sctp_wspace(asoc
) < msg_len
)
1928 sctp_prsctp_prune(asoc
, sinfo
, msg_len
- sctp_wspace(asoc
));
1930 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1931 if (!sctp_wspace(asoc
)) {
1932 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1937 /* If an address is passed with the sendto/sendmsg call, it is used
1938 * to override the primary destination address in the TCP model, or
1939 * when SCTP_ADDR_OVER flag is set in the UDP model.
1941 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1942 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1943 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1951 /* Auto-connect, if we aren't connected already. */
1952 if (sctp_state(asoc
, CLOSED
)) {
1953 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1957 wait_connect
= true;
1958 pr_debug("%s: we associated primitively\n", __func__
);
1961 /* Break the message into multiple chunks of maximum size. */
1962 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, &msg
->msg_iter
);
1963 if (IS_ERR(datamsg
)) {
1964 err
= PTR_ERR(datamsg
);
1968 /* Now send the (possibly) fragmented message. */
1969 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1970 sctp_chunk_hold(chunk
);
1972 /* Do accounting for the write space. */
1973 sctp_set_owner_w(chunk
);
1975 chunk
->transport
= chunk_tp
;
1978 /* Send it to the lower layers. Note: all chunks
1979 * must either fail or succeed. The lower layer
1980 * works that way today. Keep it that way or this
1983 err
= sctp_primitive_SEND(net
, asoc
, datamsg
);
1984 /* Did the lower layer accept the chunk? */
1986 sctp_datamsg_free(datamsg
);
1990 pr_debug("%s: we sent primitively\n", __func__
);
1992 sctp_datamsg_put(datamsg
);
1995 if (unlikely(wait_connect
)) {
1996 timeo
= sock_sndtimeo(sk
, msg_flags
& MSG_DONTWAIT
);
1997 sctp_wait_for_connect(asoc
, &timeo
);
2000 /* If we are already past ASSOCIATE, the lower
2001 * layers are responsible for association cleanup.
2007 sctp_association_free(asoc
);
2012 return sctp_error(sk
, msg_flags
, err
);
2019 err
= sock_error(sk
);
2029 /* This is an extended version of skb_pull() that removes the data from the
2030 * start of a skb even when data is spread across the list of skb's in the
2031 * frag_list. len specifies the total amount of data that needs to be removed.
2032 * when 'len' bytes could be removed from the skb, it returns 0.
2033 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2034 * could not be removed.
2036 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
2038 struct sk_buff
*list
;
2039 int skb_len
= skb_headlen(skb
);
2042 if (len
<= skb_len
) {
2043 __skb_pull(skb
, len
);
2047 __skb_pull(skb
, skb_len
);
2049 skb_walk_frags(skb
, list
) {
2050 rlen
= sctp_skb_pull(list
, len
);
2051 skb
->len
-= (len
-rlen
);
2052 skb
->data_len
-= (len
-rlen
);
2063 /* API 3.1.3 recvmsg() - UDP Style Syntax
2065 * ssize_t recvmsg(int socket, struct msghdr *message,
2068 * socket - the socket descriptor of the endpoint.
2069 * message - pointer to the msghdr structure which contains a single
2070 * user message and possibly some ancillary data.
2072 * See Section 5 for complete description of the data
2075 * flags - flags sent or received with the user message, see Section
2076 * 5 for complete description of the flags.
2078 static int sctp_recvmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
,
2079 int noblock
, int flags
, int *addr_len
)
2081 struct sctp_ulpevent
*event
= NULL
;
2082 struct sctp_sock
*sp
= sctp_sk(sk
);
2083 struct sk_buff
*skb
, *head_skb
;
2088 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2089 "addr_len:%p)\n", __func__
, sk
, msg
, len
, noblock
, flags
,
2094 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
) &&
2095 !sctp_sstate(sk
, CLOSING
) && !sctp_sstate(sk
, CLOSED
)) {
2100 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
2104 /* Get the total length of the skb including any skb's in the
2113 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
2115 event
= sctp_skb2event(skb
);
2120 if (event
->chunk
&& event
->chunk
->head_skb
)
2121 head_skb
= event
->chunk
->head_skb
;
2124 sock_recv_ts_and_drops(msg
, sk
, head_skb
);
2125 if (sctp_ulpevent_is_notification(event
)) {
2126 msg
->msg_flags
|= MSG_NOTIFICATION
;
2127 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
2129 sp
->pf
->skb_msgname(head_skb
, msg
->msg_name
, addr_len
);
2132 /* Check if we allow SCTP_NXTINFO. */
2133 if (sp
->recvnxtinfo
)
2134 sctp_ulpevent_read_nxtinfo(event
, msg
, sk
);
2135 /* Check if we allow SCTP_RCVINFO. */
2136 if (sp
->recvrcvinfo
)
2137 sctp_ulpevent_read_rcvinfo(event
, msg
);
2138 /* Check if we allow SCTP_SNDRCVINFO. */
2139 if (sp
->subscribe
.sctp_data_io_event
)
2140 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
2144 /* If skb's length exceeds the user's buffer, update the skb and
2145 * push it back to the receive_queue so that the next call to
2146 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2148 if (skb_len
> copied
) {
2149 msg
->msg_flags
&= ~MSG_EOR
;
2150 if (flags
& MSG_PEEK
)
2152 sctp_skb_pull(skb
, copied
);
2153 skb_queue_head(&sk
->sk_receive_queue
, skb
);
2155 /* When only partial message is copied to the user, increase
2156 * rwnd by that amount. If all the data in the skb is read,
2157 * rwnd is updated when the event is freed.
2159 if (!sctp_ulpevent_is_notification(event
))
2160 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
2162 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
2163 (event
->msg_flags
& MSG_EOR
))
2164 msg
->msg_flags
|= MSG_EOR
;
2166 msg
->msg_flags
&= ~MSG_EOR
;
2169 if (flags
& MSG_PEEK
) {
2170 /* Release the skb reference acquired after peeking the skb in
2171 * sctp_skb_recv_datagram().
2175 /* Free the event which includes releasing the reference to
2176 * the owner of the skb, freeing the skb and updating the
2179 sctp_ulpevent_free(event
);
2186 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2188 * This option is a on/off flag. If enabled no SCTP message
2189 * fragmentation will be performed. Instead if a message being sent
2190 * exceeds the current PMTU size, the message will NOT be sent and
2191 * instead a error will be indicated to the user.
2193 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
2194 char __user
*optval
,
2195 unsigned int optlen
)
2199 if (optlen
< sizeof(int))
2202 if (get_user(val
, (int __user
*)optval
))
2205 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
2210 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2211 unsigned int optlen
)
2213 struct sctp_association
*asoc
;
2214 struct sctp_ulpevent
*event
;
2216 if (optlen
> sizeof(struct sctp_event_subscribe
))
2218 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2221 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2222 * if there is no data to be sent or retransmit, the stack will
2223 * immediately send up this notification.
2225 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT
,
2226 &sctp_sk(sk
)->subscribe
)) {
2227 asoc
= sctp_id2assoc(sk
, 0);
2229 if (asoc
&& sctp_outq_is_empty(&asoc
->outqueue
)) {
2230 event
= sctp_ulpevent_make_sender_dry_event(asoc
,
2235 sctp_ulpq_tail_event(&asoc
->ulpq
, event
);
2242 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2244 * This socket option is applicable to the UDP-style socket only. When
2245 * set it will cause associations that are idle for more than the
2246 * specified number of seconds to automatically close. An association
2247 * being idle is defined an association that has NOT sent or received
2248 * user data. The special value of '0' indicates that no automatic
2249 * close of any associations should be performed. The option expects an
2250 * integer defining the number of seconds of idle time before an
2251 * association is closed.
2253 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2254 unsigned int optlen
)
2256 struct sctp_sock
*sp
= sctp_sk(sk
);
2257 struct net
*net
= sock_net(sk
);
2259 /* Applicable to UDP-style socket only */
2260 if (sctp_style(sk
, TCP
))
2262 if (optlen
!= sizeof(int))
2264 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2267 if (sp
->autoclose
> net
->sctp
.max_autoclose
)
2268 sp
->autoclose
= net
->sctp
.max_autoclose
;
2273 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2275 * Applications can enable or disable heartbeats for any peer address of
2276 * an association, modify an address's heartbeat interval, force a
2277 * heartbeat to be sent immediately, and adjust the address's maximum
2278 * number of retransmissions sent before an address is considered
2279 * unreachable. The following structure is used to access and modify an
2280 * address's parameters:
2282 * struct sctp_paddrparams {
2283 * sctp_assoc_t spp_assoc_id;
2284 * struct sockaddr_storage spp_address;
2285 * uint32_t spp_hbinterval;
2286 * uint16_t spp_pathmaxrxt;
2287 * uint32_t spp_pathmtu;
2288 * uint32_t spp_sackdelay;
2289 * uint32_t spp_flags;
2292 * spp_assoc_id - (one-to-many style socket) This is filled in the
2293 * application, and identifies the association for
2295 * spp_address - This specifies which address is of interest.
2296 * spp_hbinterval - This contains the value of the heartbeat interval,
2297 * in milliseconds. If a value of zero
2298 * is present in this field then no changes are to
2299 * be made to this parameter.
2300 * spp_pathmaxrxt - This contains the maximum number of
2301 * retransmissions before this address shall be
2302 * considered unreachable. If a value of zero
2303 * is present in this field then no changes are to
2304 * be made to this parameter.
2305 * spp_pathmtu - When Path MTU discovery is disabled the value
2306 * specified here will be the "fixed" path mtu.
2307 * Note that if the spp_address field is empty
2308 * then all associations on this address will
2309 * have this fixed path mtu set upon them.
2311 * spp_sackdelay - When delayed sack is enabled, this value specifies
2312 * the number of milliseconds that sacks will be delayed
2313 * for. This value will apply to all addresses of an
2314 * association if the spp_address field is empty. Note
2315 * also, that if delayed sack is enabled and this
2316 * value is set to 0, no change is made to the last
2317 * recorded delayed sack timer value.
2319 * spp_flags - These flags are used to control various features
2320 * on an association. The flag field may contain
2321 * zero or more of the following options.
2323 * SPP_HB_ENABLE - Enable heartbeats on the
2324 * specified address. Note that if the address
2325 * field is empty all addresses for the association
2326 * have heartbeats enabled upon them.
2328 * SPP_HB_DISABLE - Disable heartbeats on the
2329 * speicifed address. Note that if the address
2330 * field is empty all addresses for the association
2331 * will have their heartbeats disabled. Note also
2332 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2333 * mutually exclusive, only one of these two should
2334 * be specified. Enabling both fields will have
2335 * undetermined results.
2337 * SPP_HB_DEMAND - Request a user initiated heartbeat
2338 * to be made immediately.
2340 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2341 * heartbeat delayis to be set to the value of 0
2344 * SPP_PMTUD_ENABLE - This field will enable PMTU
2345 * discovery upon the specified address. Note that
2346 * if the address feild is empty then all addresses
2347 * on the association are effected.
2349 * SPP_PMTUD_DISABLE - This field will disable PMTU
2350 * discovery upon the specified address. Note that
2351 * if the address feild is empty then all addresses
2352 * on the association are effected. Not also that
2353 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2354 * exclusive. Enabling both will have undetermined
2357 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2358 * on delayed sack. The time specified in spp_sackdelay
2359 * is used to specify the sack delay for this address. Note
2360 * that if spp_address is empty then all addresses will
2361 * enable delayed sack and take on the sack delay
2362 * value specified in spp_sackdelay.
2363 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2364 * off delayed sack. If the spp_address field is blank then
2365 * delayed sack is disabled for the entire association. Note
2366 * also that this field is mutually exclusive to
2367 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2370 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2371 struct sctp_transport
*trans
,
2372 struct sctp_association
*asoc
,
2373 struct sctp_sock
*sp
,
2376 int sackdelay_change
)
2380 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2381 struct net
*net
= sock_net(trans
->asoc
->base
.sk
);
2383 error
= sctp_primitive_REQUESTHEARTBEAT(net
, trans
->asoc
, trans
);
2388 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2389 * this field is ignored. Note also that a value of zero indicates
2390 * the current setting should be left unchanged.
2392 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2394 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2395 * set. This lets us use 0 value when this flag
2398 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2399 params
->spp_hbinterval
= 0;
2401 if (params
->spp_hbinterval
||
2402 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2405 msecs_to_jiffies(params
->spp_hbinterval
);
2408 msecs_to_jiffies(params
->spp_hbinterval
);
2410 sp
->hbinterval
= params
->spp_hbinterval
;
2417 trans
->param_flags
=
2418 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2421 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2424 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2428 /* When Path MTU discovery is disabled the value specified here will
2429 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2430 * include the flag SPP_PMTUD_DISABLE for this field to have any
2433 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2435 trans
->pathmtu
= params
->spp_pathmtu
;
2436 sctp_assoc_sync_pmtu(sctp_opt2sk(sp
), asoc
);
2438 asoc
->pathmtu
= params
->spp_pathmtu
;
2440 sp
->pathmtu
= params
->spp_pathmtu
;
2446 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2447 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2448 trans
->param_flags
=
2449 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2451 sctp_transport_pmtu(trans
, sctp_opt2sk(sp
));
2452 sctp_assoc_sync_pmtu(sctp_opt2sk(sp
), asoc
);
2456 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2459 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2463 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2464 * value of this field is ignored. Note also that a value of zero
2465 * indicates the current setting should be left unchanged.
2467 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2470 msecs_to_jiffies(params
->spp_sackdelay
);
2473 msecs_to_jiffies(params
->spp_sackdelay
);
2475 sp
->sackdelay
= params
->spp_sackdelay
;
2479 if (sackdelay_change
) {
2481 trans
->param_flags
=
2482 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2486 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2490 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2495 /* Note that a value of zero indicates the current setting should be
2498 if (params
->spp_pathmaxrxt
) {
2500 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2502 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2504 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2511 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2512 char __user
*optval
,
2513 unsigned int optlen
)
2515 struct sctp_paddrparams params
;
2516 struct sctp_transport
*trans
= NULL
;
2517 struct sctp_association
*asoc
= NULL
;
2518 struct sctp_sock
*sp
= sctp_sk(sk
);
2520 int hb_change
, pmtud_change
, sackdelay_change
;
2522 if (optlen
!= sizeof(struct sctp_paddrparams
))
2525 if (copy_from_user(¶ms
, optval
, optlen
))
2528 /* Validate flags and value parameters. */
2529 hb_change
= params
.spp_flags
& SPP_HB
;
2530 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2531 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2533 if (hb_change
== SPP_HB
||
2534 pmtud_change
== SPP_PMTUD
||
2535 sackdelay_change
== SPP_SACKDELAY
||
2536 params
.spp_sackdelay
> 500 ||
2537 (params
.spp_pathmtu
&&
2538 params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2541 /* If an address other than INADDR_ANY is specified, and
2542 * no transport is found, then the request is invalid.
2544 if (!sctp_is_any(sk
, (union sctp_addr
*)¶ms
.spp_address
)) {
2545 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2546 params
.spp_assoc_id
);
2551 /* Get association, if assoc_id != 0 and the socket is a one
2552 * to many style socket, and an association was not found, then
2553 * the id was invalid.
2555 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2556 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2559 /* Heartbeat demand can only be sent on a transport or
2560 * association, but not a socket.
2562 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2565 /* Process parameters. */
2566 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2567 hb_change
, pmtud_change
,
2573 /* If changes are for association, also apply parameters to each
2576 if (!trans
&& asoc
) {
2577 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2579 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2580 hb_change
, pmtud_change
,
2588 static inline __u32
sctp_spp_sackdelay_enable(__u32 param_flags
)
2590 return (param_flags
& ~SPP_SACKDELAY
) | SPP_SACKDELAY_ENABLE
;
2593 static inline __u32
sctp_spp_sackdelay_disable(__u32 param_flags
)
2595 return (param_flags
& ~SPP_SACKDELAY
) | SPP_SACKDELAY_DISABLE
;
2599 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2601 * This option will effect the way delayed acks are performed. This
2602 * option allows you to get or set the delayed ack time, in
2603 * milliseconds. It also allows changing the delayed ack frequency.
2604 * Changing the frequency to 1 disables the delayed sack algorithm. If
2605 * the assoc_id is 0, then this sets or gets the endpoints default
2606 * values. If the assoc_id field is non-zero, then the set or get
2607 * effects the specified association for the one to many model (the
2608 * assoc_id field is ignored by the one to one model). Note that if
2609 * sack_delay or sack_freq are 0 when setting this option, then the
2610 * current values will remain unchanged.
2612 * struct sctp_sack_info {
2613 * sctp_assoc_t sack_assoc_id;
2614 * uint32_t sack_delay;
2615 * uint32_t sack_freq;
2618 * sack_assoc_id - This parameter, indicates which association the user
2619 * is performing an action upon. Note that if this field's value is
2620 * zero then the endpoints default value is changed (effecting future
2621 * associations only).
2623 * sack_delay - This parameter contains the number of milliseconds that
2624 * the user is requesting the delayed ACK timer be set to. Note that
2625 * this value is defined in the standard to be between 200 and 500
2628 * sack_freq - This parameter contains the number of packets that must
2629 * be received before a sack is sent without waiting for the delay
2630 * timer to expire. The default value for this is 2, setting this
2631 * value to 1 will disable the delayed sack algorithm.
2634 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2635 char __user
*optval
, unsigned int optlen
)
2637 struct sctp_sack_info params
;
2638 struct sctp_transport
*trans
= NULL
;
2639 struct sctp_association
*asoc
= NULL
;
2640 struct sctp_sock
*sp
= sctp_sk(sk
);
2642 if (optlen
== sizeof(struct sctp_sack_info
)) {
2643 if (copy_from_user(¶ms
, optval
, optlen
))
2646 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2648 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2649 pr_warn_ratelimited(DEPRECATED
2651 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2652 "Use struct sctp_sack_info instead\n",
2653 current
->comm
, task_pid_nr(current
));
2654 if (copy_from_user(¶ms
, optval
, optlen
))
2657 if (params
.sack_delay
== 0)
2658 params
.sack_freq
= 1;
2660 params
.sack_freq
= 0;
2664 /* Validate value parameter. */
2665 if (params
.sack_delay
> 500)
2668 /* Get association, if sack_assoc_id != 0 and the socket is a one
2669 * to many style socket, and an association was not found, then
2670 * the id was invalid.
2672 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2673 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2676 if (params
.sack_delay
) {
2679 msecs_to_jiffies(params
.sack_delay
);
2681 sctp_spp_sackdelay_enable(asoc
->param_flags
);
2683 sp
->sackdelay
= params
.sack_delay
;
2685 sctp_spp_sackdelay_enable(sp
->param_flags
);
2689 if (params
.sack_freq
== 1) {
2692 sctp_spp_sackdelay_disable(asoc
->param_flags
);
2695 sctp_spp_sackdelay_disable(sp
->param_flags
);
2697 } else if (params
.sack_freq
> 1) {
2699 asoc
->sackfreq
= params
.sack_freq
;
2701 sctp_spp_sackdelay_enable(asoc
->param_flags
);
2703 sp
->sackfreq
= params
.sack_freq
;
2705 sctp_spp_sackdelay_enable(sp
->param_flags
);
2709 /* If change is for association, also apply to each transport. */
2711 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2713 if (params
.sack_delay
) {
2715 msecs_to_jiffies(params
.sack_delay
);
2716 trans
->param_flags
=
2717 sctp_spp_sackdelay_enable(trans
->param_flags
);
2719 if (params
.sack_freq
== 1) {
2720 trans
->param_flags
=
2721 sctp_spp_sackdelay_disable(trans
->param_flags
);
2722 } else if (params
.sack_freq
> 1) {
2723 trans
->sackfreq
= params
.sack_freq
;
2724 trans
->param_flags
=
2725 sctp_spp_sackdelay_enable(trans
->param_flags
);
2733 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2735 * Applications can specify protocol parameters for the default association
2736 * initialization. The option name argument to setsockopt() and getsockopt()
2739 * Setting initialization parameters is effective only on an unconnected
2740 * socket (for UDP-style sockets only future associations are effected
2741 * by the change). With TCP-style sockets, this option is inherited by
2742 * sockets derived from a listener socket.
2744 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2746 struct sctp_initmsg sinit
;
2747 struct sctp_sock
*sp
= sctp_sk(sk
);
2749 if (optlen
!= sizeof(struct sctp_initmsg
))
2751 if (copy_from_user(&sinit
, optval
, optlen
))
2754 if (sinit
.sinit_num_ostreams
)
2755 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2756 if (sinit
.sinit_max_instreams
)
2757 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2758 if (sinit
.sinit_max_attempts
)
2759 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2760 if (sinit
.sinit_max_init_timeo
)
2761 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2767 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2769 * Applications that wish to use the sendto() system call may wish to
2770 * specify a default set of parameters that would normally be supplied
2771 * through the inclusion of ancillary data. This socket option allows
2772 * such an application to set the default sctp_sndrcvinfo structure.
2773 * The application that wishes to use this socket option simply passes
2774 * in to this call the sctp_sndrcvinfo structure defined in Section
2775 * 5.2.2) The input parameters accepted by this call include
2776 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2777 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2778 * to this call if the caller is using the UDP model.
2780 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2781 char __user
*optval
,
2782 unsigned int optlen
)
2784 struct sctp_sock
*sp
= sctp_sk(sk
);
2785 struct sctp_association
*asoc
;
2786 struct sctp_sndrcvinfo info
;
2788 if (optlen
!= sizeof(info
))
2790 if (copy_from_user(&info
, optval
, optlen
))
2792 if (info
.sinfo_flags
&
2793 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
2794 SCTP_ABORT
| SCTP_EOF
))
2797 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2798 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2801 asoc
->default_stream
= info
.sinfo_stream
;
2802 asoc
->default_flags
= info
.sinfo_flags
;
2803 asoc
->default_ppid
= info
.sinfo_ppid
;
2804 asoc
->default_context
= info
.sinfo_context
;
2805 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2807 sp
->default_stream
= info
.sinfo_stream
;
2808 sp
->default_flags
= info
.sinfo_flags
;
2809 sp
->default_ppid
= info
.sinfo_ppid
;
2810 sp
->default_context
= info
.sinfo_context
;
2811 sp
->default_timetolive
= info
.sinfo_timetolive
;
2817 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2818 * (SCTP_DEFAULT_SNDINFO)
2820 static int sctp_setsockopt_default_sndinfo(struct sock
*sk
,
2821 char __user
*optval
,
2822 unsigned int optlen
)
2824 struct sctp_sock
*sp
= sctp_sk(sk
);
2825 struct sctp_association
*asoc
;
2826 struct sctp_sndinfo info
;
2828 if (optlen
!= sizeof(info
))
2830 if (copy_from_user(&info
, optval
, optlen
))
2832 if (info
.snd_flags
&
2833 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
2834 SCTP_ABORT
| SCTP_EOF
))
2837 asoc
= sctp_id2assoc(sk
, info
.snd_assoc_id
);
2838 if (!asoc
&& info
.snd_assoc_id
&& sctp_style(sk
, UDP
))
2841 asoc
->default_stream
= info
.snd_sid
;
2842 asoc
->default_flags
= info
.snd_flags
;
2843 asoc
->default_ppid
= info
.snd_ppid
;
2844 asoc
->default_context
= info
.snd_context
;
2846 sp
->default_stream
= info
.snd_sid
;
2847 sp
->default_flags
= info
.snd_flags
;
2848 sp
->default_ppid
= info
.snd_ppid
;
2849 sp
->default_context
= info
.snd_context
;
2855 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2857 * Requests that the local SCTP stack use the enclosed peer address as
2858 * the association primary. The enclosed address must be one of the
2859 * association peer's addresses.
2861 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2862 unsigned int optlen
)
2864 struct sctp_prim prim
;
2865 struct sctp_transport
*trans
;
2867 if (optlen
!= sizeof(struct sctp_prim
))
2870 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2873 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2877 sctp_assoc_set_primary(trans
->asoc
, trans
);
2883 * 7.1.5 SCTP_NODELAY
2885 * Turn on/off any Nagle-like algorithm. This means that packets are
2886 * generally sent as soon as possible and no unnecessary delays are
2887 * introduced, at the cost of more packets in the network. Expects an
2888 * integer boolean flag.
2890 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2891 unsigned int optlen
)
2895 if (optlen
< sizeof(int))
2897 if (get_user(val
, (int __user
*)optval
))
2900 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2906 * 7.1.1 SCTP_RTOINFO
2908 * The protocol parameters used to initialize and bound retransmission
2909 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2910 * and modify these parameters.
2911 * All parameters are time values, in milliseconds. A value of 0, when
2912 * modifying the parameters, indicates that the current value should not
2916 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2918 struct sctp_rtoinfo rtoinfo
;
2919 struct sctp_association
*asoc
;
2920 unsigned long rto_min
, rto_max
;
2921 struct sctp_sock
*sp
= sctp_sk(sk
);
2923 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2926 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2929 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2931 /* Set the values to the specific association */
2932 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2935 rto_max
= rtoinfo
.srto_max
;
2936 rto_min
= rtoinfo
.srto_min
;
2939 rto_max
= asoc
? msecs_to_jiffies(rto_max
) : rto_max
;
2941 rto_max
= asoc
? asoc
->rto_max
: sp
->rtoinfo
.srto_max
;
2944 rto_min
= asoc
? msecs_to_jiffies(rto_min
) : rto_min
;
2946 rto_min
= asoc
? asoc
->rto_min
: sp
->rtoinfo
.srto_min
;
2948 if (rto_min
> rto_max
)
2952 if (rtoinfo
.srto_initial
!= 0)
2954 msecs_to_jiffies(rtoinfo
.srto_initial
);
2955 asoc
->rto_max
= rto_max
;
2956 asoc
->rto_min
= rto_min
;
2958 /* If there is no association or the association-id = 0
2959 * set the values to the endpoint.
2961 if (rtoinfo
.srto_initial
!= 0)
2962 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2963 sp
->rtoinfo
.srto_max
= rto_max
;
2964 sp
->rtoinfo
.srto_min
= rto_min
;
2972 * 7.1.2 SCTP_ASSOCINFO
2974 * This option is used to tune the maximum retransmission attempts
2975 * of the association.
2976 * Returns an error if the new association retransmission value is
2977 * greater than the sum of the retransmission value of the peer.
2978 * See [SCTP] for more information.
2981 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2984 struct sctp_assocparams assocparams
;
2985 struct sctp_association
*asoc
;
2987 if (optlen
!= sizeof(struct sctp_assocparams
))
2989 if (copy_from_user(&assocparams
, optval
, optlen
))
2992 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2994 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2997 /* Set the values to the specific association */
2999 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
3002 struct sctp_transport
*peer_addr
;
3004 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
3006 path_sum
+= peer_addr
->pathmaxrxt
;
3010 /* Only validate asocmaxrxt if we have more than
3011 * one path/transport. We do this because path
3012 * retransmissions are only counted when we have more
3016 assocparams
.sasoc_asocmaxrxt
> path_sum
)
3019 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
3022 if (assocparams
.sasoc_cookie_life
!= 0)
3023 asoc
->cookie_life
= ms_to_ktime(assocparams
.sasoc_cookie_life
);
3025 /* Set the values to the endpoint */
3026 struct sctp_sock
*sp
= sctp_sk(sk
);
3028 if (assocparams
.sasoc_asocmaxrxt
!= 0)
3029 sp
->assocparams
.sasoc_asocmaxrxt
=
3030 assocparams
.sasoc_asocmaxrxt
;
3031 if (assocparams
.sasoc_cookie_life
!= 0)
3032 sp
->assocparams
.sasoc_cookie_life
=
3033 assocparams
.sasoc_cookie_life
;
3039 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3041 * This socket option is a boolean flag which turns on or off mapped V4
3042 * addresses. If this option is turned on and the socket is type
3043 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3044 * If this option is turned off, then no mapping will be done of V4
3045 * addresses and a user will receive both PF_INET6 and PF_INET type
3046 * addresses on the socket.
3048 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
3051 struct sctp_sock
*sp
= sctp_sk(sk
);
3053 if (optlen
< sizeof(int))
3055 if (get_user(val
, (int __user
*)optval
))
3066 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3067 * This option will get or set the maximum size to put in any outgoing
3068 * SCTP DATA chunk. If a message is larger than this size it will be
3069 * fragmented by SCTP into the specified size. Note that the underlying
3070 * SCTP implementation may fragment into smaller sized chunks when the
3071 * PMTU of the underlying association is smaller than the value set by
3072 * the user. The default value for this option is '0' which indicates
3073 * the user is NOT limiting fragmentation and only the PMTU will effect
3074 * SCTP's choice of DATA chunk size. Note also that values set larger
3075 * than the maximum size of an IP datagram will effectively let SCTP
3076 * control fragmentation (i.e. the same as setting this option to 0).
3078 * The following structure is used to access and modify this parameter:
3080 * struct sctp_assoc_value {
3081 * sctp_assoc_t assoc_id;
3082 * uint32_t assoc_value;
3085 * assoc_id: This parameter is ignored for one-to-one style sockets.
3086 * For one-to-many style sockets this parameter indicates which
3087 * association the user is performing an action upon. Note that if
3088 * this field's value is zero then the endpoints default value is
3089 * changed (effecting future associations only).
3090 * assoc_value: This parameter specifies the maximum size in bytes.
3092 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
3094 struct sctp_assoc_value params
;
3095 struct sctp_association
*asoc
;
3096 struct sctp_sock
*sp
= sctp_sk(sk
);
3099 if (optlen
== sizeof(int)) {
3100 pr_warn_ratelimited(DEPRECATED
3102 "Use of int in maxseg socket option.\n"
3103 "Use struct sctp_assoc_value instead\n",
3104 current
->comm
, task_pid_nr(current
));
3105 if (copy_from_user(&val
, optval
, optlen
))
3107 params
.assoc_id
= 0;
3108 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3109 if (copy_from_user(¶ms
, optval
, optlen
))
3111 val
= params
.assoc_value
;
3115 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
3118 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3119 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
3124 val
= asoc
->pathmtu
;
3125 val
-= sp
->pf
->af
->net_header_len
;
3126 val
-= sizeof(struct sctphdr
) +
3127 sizeof(struct sctp_data_chunk
);
3129 asoc
->user_frag
= val
;
3130 asoc
->frag_point
= sctp_frag_point(asoc
, asoc
->pathmtu
);
3132 sp
->user_frag
= val
;
3140 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3142 * Requests that the peer mark the enclosed address as the association
3143 * primary. The enclosed address must be one of the association's
3144 * locally bound addresses. The following structure is used to make a
3145 * set primary request:
3147 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
3148 unsigned int optlen
)
3150 struct net
*net
= sock_net(sk
);
3151 struct sctp_sock
*sp
;
3152 struct sctp_association
*asoc
= NULL
;
3153 struct sctp_setpeerprim prim
;
3154 struct sctp_chunk
*chunk
;
3160 if (!net
->sctp
.addip_enable
)
3163 if (optlen
!= sizeof(struct sctp_setpeerprim
))
3166 if (copy_from_user(&prim
, optval
, optlen
))
3169 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
3173 if (!asoc
->peer
.asconf_capable
)
3176 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
3179 if (!sctp_state(asoc
, ESTABLISHED
))
3182 af
= sctp_get_af_specific(prim
.sspp_addr
.ss_family
);
3186 if (!af
->addr_valid((union sctp_addr
*)&prim
.sspp_addr
, sp
, NULL
))
3187 return -EADDRNOTAVAIL
;
3189 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
3190 return -EADDRNOTAVAIL
;
3192 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3193 chunk
= sctp_make_asconf_set_prim(asoc
,
3194 (union sctp_addr
*)&prim
.sspp_addr
);
3198 err
= sctp_send_asconf(asoc
, chunk
);
3200 pr_debug("%s: we set peer primary addr primitively\n", __func__
);
3205 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
3206 unsigned int optlen
)
3208 struct sctp_setadaptation adaptation
;
3210 if (optlen
!= sizeof(struct sctp_setadaptation
))
3212 if (copy_from_user(&adaptation
, optval
, optlen
))
3215 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
3221 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3223 * The context field in the sctp_sndrcvinfo structure is normally only
3224 * used when a failed message is retrieved holding the value that was
3225 * sent down on the actual send call. This option allows the setting of
3226 * a default context on an association basis that will be received on
3227 * reading messages from the peer. This is especially helpful in the
3228 * one-2-many model for an application to keep some reference to an
3229 * internal state machine that is processing messages on the
3230 * association. Note that the setting of this value only effects
3231 * received messages from the peer and does not effect the value that is
3232 * saved with outbound messages.
3234 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
3235 unsigned int optlen
)
3237 struct sctp_assoc_value params
;
3238 struct sctp_sock
*sp
;
3239 struct sctp_association
*asoc
;
3241 if (optlen
!= sizeof(struct sctp_assoc_value
))
3243 if (copy_from_user(¶ms
, optval
, optlen
))
3248 if (params
.assoc_id
!= 0) {
3249 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3252 asoc
->default_rcv_context
= params
.assoc_value
;
3254 sp
->default_rcv_context
= params
.assoc_value
;
3261 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3263 * This options will at a minimum specify if the implementation is doing
3264 * fragmented interleave. Fragmented interleave, for a one to many
3265 * socket, is when subsequent calls to receive a message may return
3266 * parts of messages from different associations. Some implementations
3267 * may allow you to turn this value on or off. If so, when turned off,
3268 * no fragment interleave will occur (which will cause a head of line
3269 * blocking amongst multiple associations sharing the same one to many
3270 * socket). When this option is turned on, then each receive call may
3271 * come from a different association (thus the user must receive data
3272 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3273 * association each receive belongs to.
3275 * This option takes a boolean value. A non-zero value indicates that
3276 * fragmented interleave is on. A value of zero indicates that
3277 * fragmented interleave is off.
3279 * Note that it is important that an implementation that allows this
3280 * option to be turned on, have it off by default. Otherwise an unaware
3281 * application using the one to many model may become confused and act
3284 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
3285 char __user
*optval
,
3286 unsigned int optlen
)
3290 if (optlen
!= sizeof(int))
3292 if (get_user(val
, (int __user
*)optval
))
3295 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
3301 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3302 * (SCTP_PARTIAL_DELIVERY_POINT)
3304 * This option will set or get the SCTP partial delivery point. This
3305 * point is the size of a message where the partial delivery API will be
3306 * invoked to help free up rwnd space for the peer. Setting this to a
3307 * lower value will cause partial deliveries to happen more often. The
3308 * calls argument is an integer that sets or gets the partial delivery
3309 * point. Note also that the call will fail if the user attempts to set
3310 * this value larger than the socket receive buffer size.
3312 * Note that any single message having a length smaller than or equal to
3313 * the SCTP partial delivery point will be delivered in one single read
3314 * call as long as the user provided buffer is large enough to hold the
3317 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
3318 char __user
*optval
,
3319 unsigned int optlen
)
3323 if (optlen
!= sizeof(u32
))
3325 if (get_user(val
, (int __user
*)optval
))
3328 /* Note: We double the receive buffer from what the user sets
3329 * it to be, also initial rwnd is based on rcvbuf/2.
3331 if (val
> (sk
->sk_rcvbuf
>> 1))
3334 sctp_sk(sk
)->pd_point
= val
;
3336 return 0; /* is this the right error code? */
3340 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3342 * This option will allow a user to change the maximum burst of packets
3343 * that can be emitted by this association. Note that the default value
3344 * is 4, and some implementations may restrict this setting so that it
3345 * can only be lowered.
3347 * NOTE: This text doesn't seem right. Do this on a socket basis with
3348 * future associations inheriting the socket value.
3350 static int sctp_setsockopt_maxburst(struct sock
*sk
,
3351 char __user
*optval
,
3352 unsigned int optlen
)
3354 struct sctp_assoc_value params
;
3355 struct sctp_sock
*sp
;
3356 struct sctp_association
*asoc
;
3360 if (optlen
== sizeof(int)) {
3361 pr_warn_ratelimited(DEPRECATED
3363 "Use of int in max_burst socket option deprecated.\n"
3364 "Use struct sctp_assoc_value instead\n",
3365 current
->comm
, task_pid_nr(current
));
3366 if (copy_from_user(&val
, optval
, optlen
))
3368 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3369 if (copy_from_user(¶ms
, optval
, optlen
))
3371 val
= params
.assoc_value
;
3372 assoc_id
= params
.assoc_id
;
3378 if (assoc_id
!= 0) {
3379 asoc
= sctp_id2assoc(sk
, assoc_id
);
3382 asoc
->max_burst
= val
;
3384 sp
->max_burst
= val
;
3390 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3392 * This set option adds a chunk type that the user is requesting to be
3393 * received only in an authenticated way. Changes to the list of chunks
3394 * will only effect future associations on the socket.
3396 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
3397 char __user
*optval
,
3398 unsigned int optlen
)
3400 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3401 struct sctp_authchunk val
;
3403 if (!ep
->auth_enable
)
3406 if (optlen
!= sizeof(struct sctp_authchunk
))
3408 if (copy_from_user(&val
, optval
, optlen
))
3411 switch (val
.sauth_chunk
) {
3413 case SCTP_CID_INIT_ACK
:
3414 case SCTP_CID_SHUTDOWN_COMPLETE
:
3419 /* add this chunk id to the endpoint */
3420 return sctp_auth_ep_add_chunkid(ep
, val
.sauth_chunk
);
3424 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3426 * This option gets or sets the list of HMAC algorithms that the local
3427 * endpoint requires the peer to use.
3429 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
3430 char __user
*optval
,
3431 unsigned int optlen
)
3433 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3434 struct sctp_hmacalgo
*hmacs
;
3438 if (!ep
->auth_enable
)
3441 if (optlen
< sizeof(struct sctp_hmacalgo
))
3444 hmacs
= memdup_user(optval
, optlen
);
3446 return PTR_ERR(hmacs
);
3448 idents
= hmacs
->shmac_num_idents
;
3449 if (idents
== 0 || idents
> SCTP_AUTH_NUM_HMACS
||
3450 (idents
* sizeof(u16
)) > (optlen
- sizeof(struct sctp_hmacalgo
))) {
3455 err
= sctp_auth_ep_set_hmacs(ep
, hmacs
);
3462 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3464 * This option will set a shared secret key which is used to build an
3465 * association shared key.
3467 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3468 char __user
*optval
,
3469 unsigned int optlen
)
3471 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3472 struct sctp_authkey
*authkey
;
3473 struct sctp_association
*asoc
;
3476 if (!ep
->auth_enable
)
3479 if (optlen
<= sizeof(struct sctp_authkey
))
3482 authkey
= memdup_user(optval
, optlen
);
3483 if (IS_ERR(authkey
))
3484 return PTR_ERR(authkey
);
3486 if (authkey
->sca_keylength
> optlen
- sizeof(struct sctp_authkey
)) {
3491 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3492 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3497 ret
= sctp_auth_set_key(ep
, asoc
, authkey
);
3504 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3506 * This option will get or set the active shared key to be used to build
3507 * the association shared key.
3509 static int sctp_setsockopt_active_key(struct sock
*sk
,
3510 char __user
*optval
,
3511 unsigned int optlen
)
3513 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3514 struct sctp_authkeyid val
;
3515 struct sctp_association
*asoc
;
3517 if (!ep
->auth_enable
)
3520 if (optlen
!= sizeof(struct sctp_authkeyid
))
3522 if (copy_from_user(&val
, optval
, optlen
))
3525 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3526 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3529 return sctp_auth_set_active_key(ep
, asoc
, val
.scact_keynumber
);
3533 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3535 * This set option will delete a shared secret key from use.
3537 static int sctp_setsockopt_del_key(struct sock
*sk
,
3538 char __user
*optval
,
3539 unsigned int optlen
)
3541 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3542 struct sctp_authkeyid val
;
3543 struct sctp_association
*asoc
;
3545 if (!ep
->auth_enable
)
3548 if (optlen
!= sizeof(struct sctp_authkeyid
))
3550 if (copy_from_user(&val
, optval
, optlen
))
3553 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3554 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3557 return sctp_auth_del_key_id(ep
, asoc
, val
.scact_keynumber
);
3562 * 8.1.23 SCTP_AUTO_ASCONF
3564 * This option will enable or disable the use of the automatic generation of
3565 * ASCONF chunks to add and delete addresses to an existing association. Note
3566 * that this option has two caveats namely: a) it only affects sockets that
3567 * are bound to all addresses available to the SCTP stack, and b) the system
3568 * administrator may have an overriding control that turns the ASCONF feature
3569 * off no matter what setting the socket option may have.
3570 * This option expects an integer boolean flag, where a non-zero value turns on
3571 * the option, and a zero value turns off the option.
3572 * Note. In this implementation, socket operation overrides default parameter
3573 * being set by sysctl as well as FreeBSD implementation
3575 static int sctp_setsockopt_auto_asconf(struct sock
*sk
, char __user
*optval
,
3576 unsigned int optlen
)
3579 struct sctp_sock
*sp
= sctp_sk(sk
);
3581 if (optlen
< sizeof(int))
3583 if (get_user(val
, (int __user
*)optval
))
3585 if (!sctp_is_ep_boundall(sk
) && val
)
3587 if ((val
&& sp
->do_auto_asconf
) || (!val
&& !sp
->do_auto_asconf
))
3590 spin_lock_bh(&sock_net(sk
)->sctp
.addr_wq_lock
);
3591 if (val
== 0 && sp
->do_auto_asconf
) {
3592 list_del(&sp
->auto_asconf_list
);
3593 sp
->do_auto_asconf
= 0;
3594 } else if (val
&& !sp
->do_auto_asconf
) {
3595 list_add_tail(&sp
->auto_asconf_list
,
3596 &sock_net(sk
)->sctp
.auto_asconf_splist
);
3597 sp
->do_auto_asconf
= 1;
3599 spin_unlock_bh(&sock_net(sk
)->sctp
.addr_wq_lock
);
3604 * SCTP_PEER_ADDR_THLDS
3606 * This option allows us to alter the partially failed threshold for one or all
3607 * transports in an association. See Section 6.1 of:
3608 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3610 static int sctp_setsockopt_paddr_thresholds(struct sock
*sk
,
3611 char __user
*optval
,
3612 unsigned int optlen
)
3614 struct sctp_paddrthlds val
;
3615 struct sctp_transport
*trans
;
3616 struct sctp_association
*asoc
;
3618 if (optlen
< sizeof(struct sctp_paddrthlds
))
3620 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
,
3621 sizeof(struct sctp_paddrthlds
)))
3625 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
3626 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
3629 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
3631 if (val
.spt_pathmaxrxt
)
3632 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3633 trans
->pf_retrans
= val
.spt_pathpfthld
;
3636 if (val
.spt_pathmaxrxt
)
3637 asoc
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3638 asoc
->pf_retrans
= val
.spt_pathpfthld
;
3640 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
3645 if (val
.spt_pathmaxrxt
)
3646 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3647 trans
->pf_retrans
= val
.spt_pathpfthld
;
3653 static int sctp_setsockopt_recvrcvinfo(struct sock
*sk
,
3654 char __user
*optval
,
3655 unsigned int optlen
)
3659 if (optlen
< sizeof(int))
3661 if (get_user(val
, (int __user
*) optval
))
3664 sctp_sk(sk
)->recvrcvinfo
= (val
== 0) ? 0 : 1;
3669 static int sctp_setsockopt_recvnxtinfo(struct sock
*sk
,
3670 char __user
*optval
,
3671 unsigned int optlen
)
3675 if (optlen
< sizeof(int))
3677 if (get_user(val
, (int __user
*) optval
))
3680 sctp_sk(sk
)->recvnxtinfo
= (val
== 0) ? 0 : 1;
3685 static int sctp_setsockopt_pr_supported(struct sock
*sk
,
3686 char __user
*optval
,
3687 unsigned int optlen
)
3689 struct sctp_assoc_value params
;
3690 struct sctp_association
*asoc
;
3691 int retval
= -EINVAL
;
3693 if (optlen
!= sizeof(params
))
3696 if (copy_from_user(¶ms
, optval
, optlen
)) {
3701 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3703 asoc
->prsctp_enable
= !!params
.assoc_value
;
3704 } else if (!params
.assoc_id
) {
3705 struct sctp_sock
*sp
= sctp_sk(sk
);
3707 sp
->ep
->prsctp_enable
= !!params
.assoc_value
;
3718 static int sctp_setsockopt_default_prinfo(struct sock
*sk
,
3719 char __user
*optval
,
3720 unsigned int optlen
)
3722 struct sctp_default_prinfo info
;
3723 struct sctp_association
*asoc
;
3724 int retval
= -EINVAL
;
3726 if (optlen
!= sizeof(info
))
3729 if (copy_from_user(&info
, optval
, sizeof(info
))) {
3734 if (info
.pr_policy
& ~SCTP_PR_SCTP_MASK
)
3737 if (info
.pr_policy
== SCTP_PR_SCTP_NONE
)
3740 asoc
= sctp_id2assoc(sk
, info
.pr_assoc_id
);
3742 SCTP_PR_SET_POLICY(asoc
->default_flags
, info
.pr_policy
);
3743 asoc
->default_timetolive
= info
.pr_value
;
3744 } else if (!info
.pr_assoc_id
) {
3745 struct sctp_sock
*sp
= sctp_sk(sk
);
3747 SCTP_PR_SET_POLICY(sp
->default_flags
, info
.pr_policy
);
3748 sp
->default_timetolive
= info
.pr_value
;
3759 static int sctp_setsockopt_enable_strreset(struct sock
*sk
,
3760 char __user
*optval
,
3761 unsigned int optlen
)
3763 struct sctp_assoc_value params
;
3764 struct sctp_association
*asoc
;
3765 int retval
= -EINVAL
;
3767 if (optlen
!= sizeof(params
))
3770 if (copy_from_user(¶ms
, optval
, optlen
)) {
3775 if (params
.assoc_value
& (~SCTP_ENABLE_STRRESET_MASK
))
3778 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3780 asoc
->strreset_enable
= params
.assoc_value
;
3781 } else if (!params
.assoc_id
) {
3782 struct sctp_sock
*sp
= sctp_sk(sk
);
3784 sp
->ep
->strreset_enable
= params
.assoc_value
;
3795 static int sctp_setsockopt_reset_streams(struct sock
*sk
,
3796 char __user
*optval
,
3797 unsigned int optlen
)
3799 struct sctp_reset_streams
*params
;
3800 struct sctp_association
*asoc
;
3801 int retval
= -EINVAL
;
3803 if (optlen
< sizeof(struct sctp_reset_streams
))
3806 params
= memdup_user(optval
, optlen
);
3808 return PTR_ERR(params
);
3810 asoc
= sctp_id2assoc(sk
, params
->srs_assoc_id
);
3814 retval
= sctp_send_reset_streams(asoc
, params
);
3821 static int sctp_setsockopt_reset_assoc(struct sock
*sk
,
3822 char __user
*optval
,
3823 unsigned int optlen
)
3825 struct sctp_association
*asoc
;
3826 sctp_assoc_t associd
;
3827 int retval
= -EINVAL
;
3829 if (optlen
!= sizeof(associd
))
3832 if (copy_from_user(&associd
, optval
, optlen
)) {
3837 asoc
= sctp_id2assoc(sk
, associd
);
3841 retval
= sctp_send_reset_assoc(asoc
);
3847 static int sctp_setsockopt_add_streams(struct sock
*sk
,
3848 char __user
*optval
,
3849 unsigned int optlen
)
3851 struct sctp_association
*asoc
;
3852 struct sctp_add_streams params
;
3853 int retval
= -EINVAL
;
3855 if (optlen
!= sizeof(params
))
3858 if (copy_from_user(¶ms
, optval
, optlen
)) {
3863 asoc
= sctp_id2assoc(sk
, params
.sas_assoc_id
);
3867 retval
= sctp_send_add_streams(asoc
, ¶ms
);
3873 /* API 6.2 setsockopt(), getsockopt()
3875 * Applications use setsockopt() and getsockopt() to set or retrieve
3876 * socket options. Socket options are used to change the default
3877 * behavior of sockets calls. They are described in Section 7.
3881 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3882 * int __user *optlen);
3883 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3886 * sd - the socket descript.
3887 * level - set to IPPROTO_SCTP for all SCTP options.
3888 * optname - the option name.
3889 * optval - the buffer to store the value of the option.
3890 * optlen - the size of the buffer.
3892 static int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3893 char __user
*optval
, unsigned int optlen
)
3897 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
3899 /* I can hardly begin to describe how wrong this is. This is
3900 * so broken as to be worse than useless. The API draft
3901 * REALLY is NOT helpful here... I am not convinced that the
3902 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3903 * are at all well-founded.
3905 if (level
!= SOL_SCTP
) {
3906 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3907 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3914 case SCTP_SOCKOPT_BINDX_ADD
:
3915 /* 'optlen' is the size of the addresses buffer. */
3916 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3917 optlen
, SCTP_BINDX_ADD_ADDR
);
3920 case SCTP_SOCKOPT_BINDX_REM
:
3921 /* 'optlen' is the size of the addresses buffer. */
3922 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3923 optlen
, SCTP_BINDX_REM_ADDR
);
3926 case SCTP_SOCKOPT_CONNECTX_OLD
:
3927 /* 'optlen' is the size of the addresses buffer. */
3928 retval
= sctp_setsockopt_connectx_old(sk
,
3929 (struct sockaddr __user
*)optval
,
3933 case SCTP_SOCKOPT_CONNECTX
:
3934 /* 'optlen' is the size of the addresses buffer. */
3935 retval
= sctp_setsockopt_connectx(sk
,
3936 (struct sockaddr __user
*)optval
,
3940 case SCTP_DISABLE_FRAGMENTS
:
3941 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3945 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3948 case SCTP_AUTOCLOSE
:
3949 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3952 case SCTP_PEER_ADDR_PARAMS
:
3953 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3956 case SCTP_DELAYED_SACK
:
3957 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3959 case SCTP_PARTIAL_DELIVERY_POINT
:
3960 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3964 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3966 case SCTP_DEFAULT_SEND_PARAM
:
3967 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3970 case SCTP_DEFAULT_SNDINFO
:
3971 retval
= sctp_setsockopt_default_sndinfo(sk
, optval
, optlen
);
3973 case SCTP_PRIMARY_ADDR
:
3974 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3976 case SCTP_SET_PEER_PRIMARY_ADDR
:
3977 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3980 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3983 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3985 case SCTP_ASSOCINFO
:
3986 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3988 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3989 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3992 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3994 case SCTP_ADAPTATION_LAYER
:
3995 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3998 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
4000 case SCTP_FRAGMENT_INTERLEAVE
:
4001 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
4003 case SCTP_MAX_BURST
:
4004 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
4006 case SCTP_AUTH_CHUNK
:
4007 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
4009 case SCTP_HMAC_IDENT
:
4010 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
4013 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
4015 case SCTP_AUTH_ACTIVE_KEY
:
4016 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
4018 case SCTP_AUTH_DELETE_KEY
:
4019 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
4021 case SCTP_AUTO_ASCONF
:
4022 retval
= sctp_setsockopt_auto_asconf(sk
, optval
, optlen
);
4024 case SCTP_PEER_ADDR_THLDS
:
4025 retval
= sctp_setsockopt_paddr_thresholds(sk
, optval
, optlen
);
4027 case SCTP_RECVRCVINFO
:
4028 retval
= sctp_setsockopt_recvrcvinfo(sk
, optval
, optlen
);
4030 case SCTP_RECVNXTINFO
:
4031 retval
= sctp_setsockopt_recvnxtinfo(sk
, optval
, optlen
);
4033 case SCTP_PR_SUPPORTED
:
4034 retval
= sctp_setsockopt_pr_supported(sk
, optval
, optlen
);
4036 case SCTP_DEFAULT_PRINFO
:
4037 retval
= sctp_setsockopt_default_prinfo(sk
, optval
, optlen
);
4039 case SCTP_ENABLE_STREAM_RESET
:
4040 retval
= sctp_setsockopt_enable_strreset(sk
, optval
, optlen
);
4042 case SCTP_RESET_STREAMS
:
4043 retval
= sctp_setsockopt_reset_streams(sk
, optval
, optlen
);
4045 case SCTP_RESET_ASSOC
:
4046 retval
= sctp_setsockopt_reset_assoc(sk
, optval
, optlen
);
4048 case SCTP_ADD_STREAMS
:
4049 retval
= sctp_setsockopt_add_streams(sk
, optval
, optlen
);
4052 retval
= -ENOPROTOOPT
;
4062 /* API 3.1.6 connect() - UDP Style Syntax
4064 * An application may use the connect() call in the UDP model to initiate an
4065 * association without sending data.
4069 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4071 * sd: the socket descriptor to have a new association added to.
4073 * nam: the address structure (either struct sockaddr_in or struct
4074 * sockaddr_in6 defined in RFC2553 [7]).
4076 * len: the size of the address.
4078 static int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
4086 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__
, sk
,
4089 /* Validate addr_len before calling common connect/connectx routine. */
4090 af
= sctp_get_af_specific(addr
->sa_family
);
4091 if (!af
|| addr_len
< af
->sockaddr_len
) {
4094 /* Pass correct addr len to common routine (so it knows there
4095 * is only one address being passed.
4097 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
4104 /* FIXME: Write comments. */
4105 static int sctp_disconnect(struct sock
*sk
, int flags
)
4107 return -EOPNOTSUPP
; /* STUB */
4110 /* 4.1.4 accept() - TCP Style Syntax
4112 * Applications use accept() call to remove an established SCTP
4113 * association from the accept queue of the endpoint. A new socket
4114 * descriptor will be returned from accept() to represent the newly
4115 * formed association.
4117 static struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
4119 struct sctp_sock
*sp
;
4120 struct sctp_endpoint
*ep
;
4121 struct sock
*newsk
= NULL
;
4122 struct sctp_association
*asoc
;
4131 if (!sctp_style(sk
, TCP
)) {
4132 error
= -EOPNOTSUPP
;
4136 if (!sctp_sstate(sk
, LISTENING
)) {
4141 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
4143 error
= sctp_wait_for_accept(sk
, timeo
);
4147 /* We treat the list of associations on the endpoint as the accept
4148 * queue and pick the first association on the list.
4150 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
4152 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
4158 /* Populate the fields of the newsk from the oldsk and migrate the
4159 * asoc to the newsk.
4161 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
4169 /* The SCTP ioctl handler. */
4170 static int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
4177 * SEQPACKET-style sockets in LISTENING state are valid, for
4178 * SCTP, so only discard TCP-style sockets in LISTENING state.
4180 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
4185 struct sk_buff
*skb
;
4186 unsigned int amount
= 0;
4188 skb
= skb_peek(&sk
->sk_receive_queue
);
4191 * We will only return the amount of this packet since
4192 * that is all that will be read.
4196 rc
= put_user(amount
, (int __user
*)arg
);
4208 /* This is the function which gets called during socket creation to
4209 * initialized the SCTP-specific portion of the sock.
4210 * The sock structure should already be zero-filled memory.
4212 static int sctp_init_sock(struct sock
*sk
)
4214 struct net
*net
= sock_net(sk
);
4215 struct sctp_sock
*sp
;
4217 pr_debug("%s: sk:%p\n", __func__
, sk
);
4221 /* Initialize the SCTP per socket area. */
4222 switch (sk
->sk_type
) {
4223 case SOCK_SEQPACKET
:
4224 sp
->type
= SCTP_SOCKET_UDP
;
4227 sp
->type
= SCTP_SOCKET_TCP
;
4230 return -ESOCKTNOSUPPORT
;
4233 sk
->sk_gso_type
= SKB_GSO_SCTP
;
4235 /* Initialize default send parameters. These parameters can be
4236 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4238 sp
->default_stream
= 0;
4239 sp
->default_ppid
= 0;
4240 sp
->default_flags
= 0;
4241 sp
->default_context
= 0;
4242 sp
->default_timetolive
= 0;
4244 sp
->default_rcv_context
= 0;
4245 sp
->max_burst
= net
->sctp
.max_burst
;
4247 sp
->sctp_hmac_alg
= net
->sctp
.sctp_hmac_alg
;
4249 /* Initialize default setup parameters. These parameters
4250 * can be modified with the SCTP_INITMSG socket option or
4251 * overridden by the SCTP_INIT CMSG.
4253 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
4254 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
4255 sp
->initmsg
.sinit_max_attempts
= net
->sctp
.max_retrans_init
;
4256 sp
->initmsg
.sinit_max_init_timeo
= net
->sctp
.rto_max
;
4258 /* Initialize default RTO related parameters. These parameters can
4259 * be modified for with the SCTP_RTOINFO socket option.
4261 sp
->rtoinfo
.srto_initial
= net
->sctp
.rto_initial
;
4262 sp
->rtoinfo
.srto_max
= net
->sctp
.rto_max
;
4263 sp
->rtoinfo
.srto_min
= net
->sctp
.rto_min
;
4265 /* Initialize default association related parameters. These parameters
4266 * can be modified with the SCTP_ASSOCINFO socket option.
4268 sp
->assocparams
.sasoc_asocmaxrxt
= net
->sctp
.max_retrans_association
;
4269 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
4270 sp
->assocparams
.sasoc_peer_rwnd
= 0;
4271 sp
->assocparams
.sasoc_local_rwnd
= 0;
4272 sp
->assocparams
.sasoc_cookie_life
= net
->sctp
.valid_cookie_life
;
4274 /* Initialize default event subscriptions. By default, all the
4277 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
4279 /* Default Peer Address Parameters. These defaults can
4280 * be modified via SCTP_PEER_ADDR_PARAMS
4282 sp
->hbinterval
= net
->sctp
.hb_interval
;
4283 sp
->pathmaxrxt
= net
->sctp
.max_retrans_path
;
4284 sp
->pathmtu
= 0; /* allow default discovery */
4285 sp
->sackdelay
= net
->sctp
.sack_timeout
;
4287 sp
->param_flags
= SPP_HB_ENABLE
|
4289 SPP_SACKDELAY_ENABLE
;
4291 /* If enabled no SCTP message fragmentation will be performed.
4292 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4294 sp
->disable_fragments
= 0;
4296 /* Enable Nagle algorithm by default. */
4299 sp
->recvrcvinfo
= 0;
4300 sp
->recvnxtinfo
= 0;
4302 /* Enable by default. */
4305 /* Auto-close idle associations after the configured
4306 * number of seconds. A value of 0 disables this
4307 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4308 * for UDP-style sockets only.
4312 /* User specified fragmentation limit. */
4315 sp
->adaptation_ind
= 0;
4317 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
4319 /* Control variables for partial data delivery. */
4320 atomic_set(&sp
->pd_mode
, 0);
4321 skb_queue_head_init(&sp
->pd_lobby
);
4322 sp
->frag_interleave
= 0;
4324 /* Create a per socket endpoint structure. Even if we
4325 * change the data structure relationships, this may still
4326 * be useful for storing pre-connect address information.
4328 sp
->ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
4334 sk
->sk_destruct
= sctp_destruct_sock
;
4336 SCTP_DBG_OBJCNT_INC(sock
);
4339 percpu_counter_inc(&sctp_sockets_allocated
);
4340 sock_prot_inuse_add(net
, sk
->sk_prot
, 1);
4342 /* Nothing can fail after this block, otherwise
4343 * sctp_destroy_sock() will be called without addr_wq_lock held
4345 if (net
->sctp
.default_auto_asconf
) {
4346 spin_lock(&sock_net(sk
)->sctp
.addr_wq_lock
);
4347 list_add_tail(&sp
->auto_asconf_list
,
4348 &net
->sctp
.auto_asconf_splist
);
4349 sp
->do_auto_asconf
= 1;
4350 spin_unlock(&sock_net(sk
)->sctp
.addr_wq_lock
);
4352 sp
->do_auto_asconf
= 0;
4360 /* Cleanup any SCTP per socket resources. Must be called with
4361 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4363 static void sctp_destroy_sock(struct sock
*sk
)
4365 struct sctp_sock
*sp
;
4367 pr_debug("%s: sk:%p\n", __func__
, sk
);
4369 /* Release our hold on the endpoint. */
4371 /* This could happen during socket init, thus we bail out
4372 * early, since the rest of the below is not setup either.
4377 if (sp
->do_auto_asconf
) {
4378 sp
->do_auto_asconf
= 0;
4379 list_del(&sp
->auto_asconf_list
);
4381 sctp_endpoint_free(sp
->ep
);
4383 percpu_counter_dec(&sctp_sockets_allocated
);
4384 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
4388 /* Triggered when there are no references on the socket anymore */
4389 static void sctp_destruct_sock(struct sock
*sk
)
4391 struct sctp_sock
*sp
= sctp_sk(sk
);
4393 /* Free up the HMAC transform. */
4394 crypto_free_shash(sp
->hmac
);
4396 inet_sock_destruct(sk
);
4399 /* API 4.1.7 shutdown() - TCP Style Syntax
4400 * int shutdown(int socket, int how);
4402 * sd - the socket descriptor of the association to be closed.
4403 * how - Specifies the type of shutdown. The values are
4406 * Disables further receive operations. No SCTP
4407 * protocol action is taken.
4409 * Disables further send operations, and initiates
4410 * the SCTP shutdown sequence.
4412 * Disables further send and receive operations
4413 * and initiates the SCTP shutdown sequence.
4415 static void sctp_shutdown(struct sock
*sk
, int how
)
4417 struct net
*net
= sock_net(sk
);
4418 struct sctp_endpoint
*ep
;
4420 if (!sctp_style(sk
, TCP
))
4423 ep
= sctp_sk(sk
)->ep
;
4424 if (how
& SEND_SHUTDOWN
&& !list_empty(&ep
->asocs
)) {
4425 struct sctp_association
*asoc
;
4427 sk
->sk_state
= SCTP_SS_CLOSING
;
4428 asoc
= list_entry(ep
->asocs
.next
,
4429 struct sctp_association
, asocs
);
4430 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
4434 int sctp_get_sctp_info(struct sock
*sk
, struct sctp_association
*asoc
,
4435 struct sctp_info
*info
)
4437 struct sctp_transport
*prim
;
4438 struct list_head
*pos
;
4441 memset(info
, 0, sizeof(*info
));
4443 struct sctp_sock
*sp
= sctp_sk(sk
);
4445 info
->sctpi_s_autoclose
= sp
->autoclose
;
4446 info
->sctpi_s_adaptation_ind
= sp
->adaptation_ind
;
4447 info
->sctpi_s_pd_point
= sp
->pd_point
;
4448 info
->sctpi_s_nodelay
= sp
->nodelay
;
4449 info
->sctpi_s_disable_fragments
= sp
->disable_fragments
;
4450 info
->sctpi_s_v4mapped
= sp
->v4mapped
;
4451 info
->sctpi_s_frag_interleave
= sp
->frag_interleave
;
4452 info
->sctpi_s_type
= sp
->type
;
4457 info
->sctpi_tag
= asoc
->c
.my_vtag
;
4458 info
->sctpi_state
= asoc
->state
;
4459 info
->sctpi_rwnd
= asoc
->a_rwnd
;
4460 info
->sctpi_unackdata
= asoc
->unack_data
;
4461 info
->sctpi_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4462 info
->sctpi_instrms
= asoc
->c
.sinit_max_instreams
;
4463 info
->sctpi_outstrms
= asoc
->c
.sinit_num_ostreams
;
4464 list_for_each(pos
, &asoc
->base
.inqueue
.in_chunk_list
)
4465 info
->sctpi_inqueue
++;
4466 list_for_each(pos
, &asoc
->outqueue
.out_chunk_list
)
4467 info
->sctpi_outqueue
++;
4468 info
->sctpi_overall_error
= asoc
->overall_error_count
;
4469 info
->sctpi_max_burst
= asoc
->max_burst
;
4470 info
->sctpi_maxseg
= asoc
->frag_point
;
4471 info
->sctpi_peer_rwnd
= asoc
->peer
.rwnd
;
4472 info
->sctpi_peer_tag
= asoc
->c
.peer_vtag
;
4474 mask
= asoc
->peer
.ecn_capable
<< 1;
4475 mask
= (mask
| asoc
->peer
.ipv4_address
) << 1;
4476 mask
= (mask
| asoc
->peer
.ipv6_address
) << 1;
4477 mask
= (mask
| asoc
->peer
.hostname_address
) << 1;
4478 mask
= (mask
| asoc
->peer
.asconf_capable
) << 1;
4479 mask
= (mask
| asoc
->peer
.prsctp_capable
) << 1;
4480 mask
= (mask
| asoc
->peer
.auth_capable
);
4481 info
->sctpi_peer_capable
= mask
;
4482 mask
= asoc
->peer
.sack_needed
<< 1;
4483 mask
= (mask
| asoc
->peer
.sack_generation
) << 1;
4484 mask
= (mask
| asoc
->peer
.zero_window_announced
);
4485 info
->sctpi_peer_sack
= mask
;
4487 info
->sctpi_isacks
= asoc
->stats
.isacks
;
4488 info
->sctpi_osacks
= asoc
->stats
.osacks
;
4489 info
->sctpi_opackets
= asoc
->stats
.opackets
;
4490 info
->sctpi_ipackets
= asoc
->stats
.ipackets
;
4491 info
->sctpi_rtxchunks
= asoc
->stats
.rtxchunks
;
4492 info
->sctpi_outofseqtsns
= asoc
->stats
.outofseqtsns
;
4493 info
->sctpi_idupchunks
= asoc
->stats
.idupchunks
;
4494 info
->sctpi_gapcnt
= asoc
->stats
.gapcnt
;
4495 info
->sctpi_ouodchunks
= asoc
->stats
.ouodchunks
;
4496 info
->sctpi_iuodchunks
= asoc
->stats
.iuodchunks
;
4497 info
->sctpi_oodchunks
= asoc
->stats
.oodchunks
;
4498 info
->sctpi_iodchunks
= asoc
->stats
.iodchunks
;
4499 info
->sctpi_octrlchunks
= asoc
->stats
.octrlchunks
;
4500 info
->sctpi_ictrlchunks
= asoc
->stats
.ictrlchunks
;
4502 prim
= asoc
->peer
.primary_path
;
4503 memcpy(&info
->sctpi_p_address
, &prim
->ipaddr
,
4504 sizeof(struct sockaddr_storage
));
4505 info
->sctpi_p_state
= prim
->state
;
4506 info
->sctpi_p_cwnd
= prim
->cwnd
;
4507 info
->sctpi_p_srtt
= prim
->srtt
;
4508 info
->sctpi_p_rto
= jiffies_to_msecs(prim
->rto
);
4509 info
->sctpi_p_hbinterval
= prim
->hbinterval
;
4510 info
->sctpi_p_pathmaxrxt
= prim
->pathmaxrxt
;
4511 info
->sctpi_p_sackdelay
= jiffies_to_msecs(prim
->sackdelay
);
4512 info
->sctpi_p_ssthresh
= prim
->ssthresh
;
4513 info
->sctpi_p_partial_bytes_acked
= prim
->partial_bytes_acked
;
4514 info
->sctpi_p_flight_size
= prim
->flight_size
;
4515 info
->sctpi_p_error
= prim
->error_count
;
4519 EXPORT_SYMBOL_GPL(sctp_get_sctp_info
);
4521 /* use callback to avoid exporting the core structure */
4522 int sctp_transport_walk_start(struct rhashtable_iter
*iter
)
4526 rhltable_walk_enter(&sctp_transport_hashtable
, iter
);
4528 err
= rhashtable_walk_start(iter
);
4529 if (err
&& err
!= -EAGAIN
) {
4530 rhashtable_walk_stop(iter
);
4531 rhashtable_walk_exit(iter
);
4538 void sctp_transport_walk_stop(struct rhashtable_iter
*iter
)
4540 rhashtable_walk_stop(iter
);
4541 rhashtable_walk_exit(iter
);
4544 struct sctp_transport
*sctp_transport_get_next(struct net
*net
,
4545 struct rhashtable_iter
*iter
)
4547 struct sctp_transport
*t
;
4549 t
= rhashtable_walk_next(iter
);
4550 for (; t
; t
= rhashtable_walk_next(iter
)) {
4552 if (PTR_ERR(t
) == -EAGAIN
)
4557 if (net_eq(sock_net(t
->asoc
->base
.sk
), net
) &&
4558 t
->asoc
->peer
.primary_path
== t
)
4565 struct sctp_transport
*sctp_transport_get_idx(struct net
*net
,
4566 struct rhashtable_iter
*iter
,
4569 void *obj
= SEQ_START_TOKEN
;
4571 while (pos
&& (obj
= sctp_transport_get_next(net
, iter
)) &&
4578 int sctp_for_each_endpoint(int (*cb
)(struct sctp_endpoint
*, void *),
4582 struct sctp_ep_common
*epb
;
4583 struct sctp_hashbucket
*head
;
4585 for (head
= sctp_ep_hashtable
; hash
< sctp_ep_hashsize
;
4587 read_lock(&head
->lock
);
4588 sctp_for_each_hentry(epb
, &head
->chain
) {
4589 err
= cb(sctp_ep(epb
), p
);
4593 read_unlock(&head
->lock
);
4598 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint
);
4600 int sctp_transport_lookup_process(int (*cb
)(struct sctp_transport
*, void *),
4602 const union sctp_addr
*laddr
,
4603 const union sctp_addr
*paddr
, void *p
)
4605 struct sctp_transport
*transport
;
4609 transport
= sctp_addrs_lookup_transport(net
, laddr
, paddr
);
4614 err
= cb(transport
, p
);
4615 sctp_transport_put(transport
);
4619 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process
);
4621 int sctp_for_each_transport(int (*cb
)(struct sctp_transport
*, void *),
4622 struct net
*net
, int pos
, void *p
) {
4623 struct rhashtable_iter hti
;
4627 err
= sctp_transport_walk_start(&hti
);
4631 sctp_transport_get_idx(net
, &hti
, pos
);
4632 obj
= sctp_transport_get_next(net
, &hti
);
4633 for (; obj
&& !IS_ERR(obj
); obj
= sctp_transport_get_next(net
, &hti
)) {
4634 struct sctp_transport
*transport
= obj
;
4636 if (!sctp_transport_hold(transport
))
4638 err
= cb(transport
, p
);
4639 sctp_transport_put(transport
);
4643 sctp_transport_walk_stop(&hti
);
4647 EXPORT_SYMBOL_GPL(sctp_for_each_transport
);
4649 /* 7.2.1 Association Status (SCTP_STATUS)
4651 * Applications can retrieve current status information about an
4652 * association, including association state, peer receiver window size,
4653 * number of unacked data chunks, and number of data chunks pending
4654 * receipt. This information is read-only.
4656 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
4657 char __user
*optval
,
4660 struct sctp_status status
;
4661 struct sctp_association
*asoc
= NULL
;
4662 struct sctp_transport
*transport
;
4663 sctp_assoc_t associd
;
4666 if (len
< sizeof(status
)) {
4671 len
= sizeof(status
);
4672 if (copy_from_user(&status
, optval
, len
)) {
4677 associd
= status
.sstat_assoc_id
;
4678 asoc
= sctp_id2assoc(sk
, associd
);
4684 transport
= asoc
->peer
.primary_path
;
4686 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
4687 status
.sstat_state
= sctp_assoc_to_state(asoc
);
4688 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
4689 status
.sstat_unackdata
= asoc
->unack_data
;
4691 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4692 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
4693 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
4694 status
.sstat_fragmentation_point
= asoc
->frag_point
;
4695 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4696 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
4697 transport
->af_specific
->sockaddr_len
);
4698 /* Map ipv4 address into v4-mapped-on-v6 address. */
4699 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sctp_sk(sk
),
4700 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
4701 status
.sstat_primary
.spinfo_state
= transport
->state
;
4702 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
4703 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
4704 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4705 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
4707 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
4708 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
4710 if (put_user(len
, optlen
)) {
4715 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4716 __func__
, len
, status
.sstat_state
, status
.sstat_rwnd
,
4717 status
.sstat_assoc_id
);
4719 if (copy_to_user(optval
, &status
, len
)) {
4729 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4731 * Applications can retrieve information about a specific peer address
4732 * of an association, including its reachability state, congestion
4733 * window, and retransmission timer values. This information is
4736 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
4737 char __user
*optval
,
4740 struct sctp_paddrinfo pinfo
;
4741 struct sctp_transport
*transport
;
4744 if (len
< sizeof(pinfo
)) {
4749 len
= sizeof(pinfo
);
4750 if (copy_from_user(&pinfo
, optval
, len
)) {
4755 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
4756 pinfo
.spinfo_assoc_id
);
4760 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4761 pinfo
.spinfo_state
= transport
->state
;
4762 pinfo
.spinfo_cwnd
= transport
->cwnd
;
4763 pinfo
.spinfo_srtt
= transport
->srtt
;
4764 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4765 pinfo
.spinfo_mtu
= transport
->pathmtu
;
4767 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
4768 pinfo
.spinfo_state
= SCTP_ACTIVE
;
4770 if (put_user(len
, optlen
)) {
4775 if (copy_to_user(optval
, &pinfo
, len
)) {
4784 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4786 * This option is a on/off flag. If enabled no SCTP message
4787 * fragmentation will be performed. Instead if a message being sent
4788 * exceeds the current PMTU size, the message will NOT be sent and
4789 * instead a error will be indicated to the user.
4791 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
4792 char __user
*optval
, int __user
*optlen
)
4796 if (len
< sizeof(int))
4800 val
= (sctp_sk(sk
)->disable_fragments
== 1);
4801 if (put_user(len
, optlen
))
4803 if (copy_to_user(optval
, &val
, len
))
4808 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4810 * This socket option is used to specify various notifications and
4811 * ancillary data the user wishes to receive.
4813 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
4818 if (len
> sizeof(struct sctp_event_subscribe
))
4819 len
= sizeof(struct sctp_event_subscribe
);
4820 if (put_user(len
, optlen
))
4822 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
4827 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4829 * This socket option is applicable to the UDP-style socket only. When
4830 * set it will cause associations that are idle for more than the
4831 * specified number of seconds to automatically close. An association
4832 * being idle is defined an association that has NOT sent or received
4833 * user data. The special value of '0' indicates that no automatic
4834 * close of any associations should be performed. The option expects an
4835 * integer defining the number of seconds of idle time before an
4836 * association is closed.
4838 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4840 /* Applicable to UDP-style socket only */
4841 if (sctp_style(sk
, TCP
))
4843 if (len
< sizeof(int))
4846 if (put_user(len
, optlen
))
4848 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
4853 /* Helper routine to branch off an association to a new socket. */
4854 int sctp_do_peeloff(struct sock
*sk
, sctp_assoc_t id
, struct socket
**sockp
)
4856 struct sctp_association
*asoc
= sctp_id2assoc(sk
, id
);
4857 struct sctp_sock
*sp
= sctp_sk(sk
);
4858 struct socket
*sock
;
4864 /* An association cannot be branched off from an already peeled-off
4865 * socket, nor is this supported for tcp style sockets.
4867 if (!sctp_style(sk
, UDP
))
4870 /* Create a new socket. */
4871 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
4875 sctp_copy_sock(sock
->sk
, sk
, asoc
);
4877 /* Make peeled-off sockets more like 1-1 accepted sockets.
4878 * Set the daddr and initialize id to something more random
4880 sp
->pf
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
4882 /* Populate the fields of the newsk from the oldsk and migrate the
4883 * asoc to the newsk.
4885 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
4891 EXPORT_SYMBOL(sctp_do_peeloff
);
4893 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4895 sctp_peeloff_arg_t peeloff
;
4896 struct socket
*newsock
;
4897 struct file
*newfile
;
4900 if (len
< sizeof(sctp_peeloff_arg_t
))
4902 len
= sizeof(sctp_peeloff_arg_t
);
4903 if (copy_from_user(&peeloff
, optval
, len
))
4906 retval
= sctp_do_peeloff(sk
, peeloff
.associd
, &newsock
);
4910 /* Map the socket to an unused fd that can be returned to the user. */
4911 retval
= get_unused_fd_flags(0);
4913 sock_release(newsock
);
4917 newfile
= sock_alloc_file(newsock
, 0, NULL
);
4918 if (IS_ERR(newfile
)) {
4919 put_unused_fd(retval
);
4920 sock_release(newsock
);
4921 return PTR_ERR(newfile
);
4924 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__
, sk
, newsock
->sk
,
4927 /* Return the fd mapped to the new socket. */
4928 if (put_user(len
, optlen
)) {
4930 put_unused_fd(retval
);
4933 peeloff
.sd
= retval
;
4934 if (copy_to_user(optval
, &peeloff
, len
)) {
4936 put_unused_fd(retval
);
4939 fd_install(retval
, newfile
);
4944 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4946 * Applications can enable or disable heartbeats for any peer address of
4947 * an association, modify an address's heartbeat interval, force a
4948 * heartbeat to be sent immediately, and adjust the address's maximum
4949 * number of retransmissions sent before an address is considered
4950 * unreachable. The following structure is used to access and modify an
4951 * address's parameters:
4953 * struct sctp_paddrparams {
4954 * sctp_assoc_t spp_assoc_id;
4955 * struct sockaddr_storage spp_address;
4956 * uint32_t spp_hbinterval;
4957 * uint16_t spp_pathmaxrxt;
4958 * uint32_t spp_pathmtu;
4959 * uint32_t spp_sackdelay;
4960 * uint32_t spp_flags;
4963 * spp_assoc_id - (one-to-many style socket) This is filled in the
4964 * application, and identifies the association for
4966 * spp_address - This specifies which address is of interest.
4967 * spp_hbinterval - This contains the value of the heartbeat interval,
4968 * in milliseconds. If a value of zero
4969 * is present in this field then no changes are to
4970 * be made to this parameter.
4971 * spp_pathmaxrxt - This contains the maximum number of
4972 * retransmissions before this address shall be
4973 * considered unreachable. If a value of zero
4974 * is present in this field then no changes are to
4975 * be made to this parameter.
4976 * spp_pathmtu - When Path MTU discovery is disabled the value
4977 * specified here will be the "fixed" path mtu.
4978 * Note that if the spp_address field is empty
4979 * then all associations on this address will
4980 * have this fixed path mtu set upon them.
4982 * spp_sackdelay - When delayed sack is enabled, this value specifies
4983 * the number of milliseconds that sacks will be delayed
4984 * for. This value will apply to all addresses of an
4985 * association if the spp_address field is empty. Note
4986 * also, that if delayed sack is enabled and this
4987 * value is set to 0, no change is made to the last
4988 * recorded delayed sack timer value.
4990 * spp_flags - These flags are used to control various features
4991 * on an association. The flag field may contain
4992 * zero or more of the following options.
4994 * SPP_HB_ENABLE - Enable heartbeats on the
4995 * specified address. Note that if the address
4996 * field is empty all addresses for the association
4997 * have heartbeats enabled upon them.
4999 * SPP_HB_DISABLE - Disable heartbeats on the
5000 * speicifed address. Note that if the address
5001 * field is empty all addresses for the association
5002 * will have their heartbeats disabled. Note also
5003 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5004 * mutually exclusive, only one of these two should
5005 * be specified. Enabling both fields will have
5006 * undetermined results.
5008 * SPP_HB_DEMAND - Request a user initiated heartbeat
5009 * to be made immediately.
5011 * SPP_PMTUD_ENABLE - This field will enable PMTU
5012 * discovery upon the specified address. Note that
5013 * if the address feild is empty then all addresses
5014 * on the association are effected.
5016 * SPP_PMTUD_DISABLE - This field will disable PMTU
5017 * discovery upon the specified address. Note that
5018 * if the address feild is empty then all addresses
5019 * on the association are effected. Not also that
5020 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5021 * exclusive. Enabling both will have undetermined
5024 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5025 * on delayed sack. The time specified in spp_sackdelay
5026 * is used to specify the sack delay for this address. Note
5027 * that if spp_address is empty then all addresses will
5028 * enable delayed sack and take on the sack delay
5029 * value specified in spp_sackdelay.
5030 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5031 * off delayed sack. If the spp_address field is blank then
5032 * delayed sack is disabled for the entire association. Note
5033 * also that this field is mutually exclusive to
5034 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5037 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
5038 char __user
*optval
, int __user
*optlen
)
5040 struct sctp_paddrparams params
;
5041 struct sctp_transport
*trans
= NULL
;
5042 struct sctp_association
*asoc
= NULL
;
5043 struct sctp_sock
*sp
= sctp_sk(sk
);
5045 if (len
< sizeof(struct sctp_paddrparams
))
5047 len
= sizeof(struct sctp_paddrparams
);
5048 if (copy_from_user(¶ms
, optval
, len
))
5051 /* If an address other than INADDR_ANY is specified, and
5052 * no transport is found, then the request is invalid.
5054 if (!sctp_is_any(sk
, (union sctp_addr
*)¶ms
.spp_address
)) {
5055 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
5056 params
.spp_assoc_id
);
5058 pr_debug("%s: failed no transport\n", __func__
);
5063 /* Get association, if assoc_id != 0 and the socket is a one
5064 * to many style socket, and an association was not found, then
5065 * the id was invalid.
5067 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
5068 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
5069 pr_debug("%s: failed no association\n", __func__
);
5074 /* Fetch transport values. */
5075 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
5076 params
.spp_pathmtu
= trans
->pathmtu
;
5077 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
5078 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
5080 /*draft-11 doesn't say what to return in spp_flags*/
5081 params
.spp_flags
= trans
->param_flags
;
5083 /* Fetch association values. */
5084 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
5085 params
.spp_pathmtu
= asoc
->pathmtu
;
5086 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
5087 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
5089 /*draft-11 doesn't say what to return in spp_flags*/
5090 params
.spp_flags
= asoc
->param_flags
;
5092 /* Fetch socket values. */
5093 params
.spp_hbinterval
= sp
->hbinterval
;
5094 params
.spp_pathmtu
= sp
->pathmtu
;
5095 params
.spp_sackdelay
= sp
->sackdelay
;
5096 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
5098 /*draft-11 doesn't say what to return in spp_flags*/
5099 params
.spp_flags
= sp
->param_flags
;
5102 if (copy_to_user(optval
, ¶ms
, len
))
5105 if (put_user(len
, optlen
))
5112 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5114 * This option will effect the way delayed acks are performed. This
5115 * option allows you to get or set the delayed ack time, in
5116 * milliseconds. It also allows changing the delayed ack frequency.
5117 * Changing the frequency to 1 disables the delayed sack algorithm. If
5118 * the assoc_id is 0, then this sets or gets the endpoints default
5119 * values. If the assoc_id field is non-zero, then the set or get
5120 * effects the specified association for the one to many model (the
5121 * assoc_id field is ignored by the one to one model). Note that if
5122 * sack_delay or sack_freq are 0 when setting this option, then the
5123 * current values will remain unchanged.
5125 * struct sctp_sack_info {
5126 * sctp_assoc_t sack_assoc_id;
5127 * uint32_t sack_delay;
5128 * uint32_t sack_freq;
5131 * sack_assoc_id - This parameter, indicates which association the user
5132 * is performing an action upon. Note that if this field's value is
5133 * zero then the endpoints default value is changed (effecting future
5134 * associations only).
5136 * sack_delay - This parameter contains the number of milliseconds that
5137 * the user is requesting the delayed ACK timer be set to. Note that
5138 * this value is defined in the standard to be between 200 and 500
5141 * sack_freq - This parameter contains the number of packets that must
5142 * be received before a sack is sent without waiting for the delay
5143 * timer to expire. The default value for this is 2, setting this
5144 * value to 1 will disable the delayed sack algorithm.
5146 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
5147 char __user
*optval
,
5150 struct sctp_sack_info params
;
5151 struct sctp_association
*asoc
= NULL
;
5152 struct sctp_sock
*sp
= sctp_sk(sk
);
5154 if (len
>= sizeof(struct sctp_sack_info
)) {
5155 len
= sizeof(struct sctp_sack_info
);
5157 if (copy_from_user(¶ms
, optval
, len
))
5159 } else if (len
== sizeof(struct sctp_assoc_value
)) {
5160 pr_warn_ratelimited(DEPRECATED
5162 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5163 "Use struct sctp_sack_info instead\n",
5164 current
->comm
, task_pid_nr(current
));
5165 if (copy_from_user(¶ms
, optval
, len
))
5170 /* Get association, if sack_assoc_id != 0 and the socket is a one
5171 * to many style socket, and an association was not found, then
5172 * the id was invalid.
5174 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
5175 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
5179 /* Fetch association values. */
5180 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
5181 params
.sack_delay
= jiffies_to_msecs(
5183 params
.sack_freq
= asoc
->sackfreq
;
5186 params
.sack_delay
= 0;
5187 params
.sack_freq
= 1;
5190 /* Fetch socket values. */
5191 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
5192 params
.sack_delay
= sp
->sackdelay
;
5193 params
.sack_freq
= sp
->sackfreq
;
5195 params
.sack_delay
= 0;
5196 params
.sack_freq
= 1;
5200 if (copy_to_user(optval
, ¶ms
, len
))
5203 if (put_user(len
, optlen
))
5209 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5211 * Applications can specify protocol parameters for the default association
5212 * initialization. The option name argument to setsockopt() and getsockopt()
5215 * Setting initialization parameters is effective only on an unconnected
5216 * socket (for UDP-style sockets only future associations are effected
5217 * by the change). With TCP-style sockets, this option is inherited by
5218 * sockets derived from a listener socket.
5220 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
5222 if (len
< sizeof(struct sctp_initmsg
))
5224 len
= sizeof(struct sctp_initmsg
);
5225 if (put_user(len
, optlen
))
5227 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
5233 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
5234 char __user
*optval
, int __user
*optlen
)
5236 struct sctp_association
*asoc
;
5238 struct sctp_getaddrs getaddrs
;
5239 struct sctp_transport
*from
;
5241 union sctp_addr temp
;
5242 struct sctp_sock
*sp
= sctp_sk(sk
);
5247 if (len
< sizeof(struct sctp_getaddrs
))
5250 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
5253 /* For UDP-style sockets, id specifies the association to query. */
5254 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
5258 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
5259 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
5261 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
5263 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
5264 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5265 ->addr_to_user(sp
, &temp
);
5266 if (space_left
< addrlen
)
5268 if (copy_to_user(to
, &temp
, addrlen
))
5272 space_left
-= addrlen
;
5275 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
5277 bytes_copied
= ((char __user
*)to
) - optval
;
5278 if (put_user(bytes_copied
, optlen
))
5284 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
5285 size_t space_left
, int *bytes_copied
)
5287 struct sctp_sockaddr_entry
*addr
;
5288 union sctp_addr temp
;
5291 struct net
*net
= sock_net(sk
);
5294 list_for_each_entry_rcu(addr
, &net
->sctp
.local_addr_list
, list
) {
5298 if ((PF_INET
== sk
->sk_family
) &&
5299 (AF_INET6
== addr
->a
.sa
.sa_family
))
5301 if ((PF_INET6
== sk
->sk_family
) &&
5302 inet_v6_ipv6only(sk
) &&
5303 (AF_INET
== addr
->a
.sa
.sa_family
))
5305 memcpy(&temp
, &addr
->a
, sizeof(temp
));
5306 if (!temp
.v4
.sin_port
)
5307 temp
.v4
.sin_port
= htons(port
);
5309 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5310 ->addr_to_user(sctp_sk(sk
), &temp
);
5312 if (space_left
< addrlen
) {
5316 memcpy(to
, &temp
, addrlen
);
5320 space_left
-= addrlen
;
5321 *bytes_copied
+= addrlen
;
5329 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
5330 char __user
*optval
, int __user
*optlen
)
5332 struct sctp_bind_addr
*bp
;
5333 struct sctp_association
*asoc
;
5335 struct sctp_getaddrs getaddrs
;
5336 struct sctp_sockaddr_entry
*addr
;
5338 union sctp_addr temp
;
5339 struct sctp_sock
*sp
= sctp_sk(sk
);
5343 int bytes_copied
= 0;
5347 if (len
< sizeof(struct sctp_getaddrs
))
5350 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
5354 * For UDP-style sockets, id specifies the association to query.
5355 * If the id field is set to the value '0' then the locally bound
5356 * addresses are returned without regard to any particular
5359 if (0 == getaddrs
.assoc_id
) {
5360 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
5362 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
5365 bp
= &asoc
->base
.bind_addr
;
5368 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
5369 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
5371 addrs
= kmalloc(space_left
, GFP_USER
| __GFP_NOWARN
);
5375 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5376 * addresses from the global local address list.
5378 if (sctp_list_single_entry(&bp
->address_list
)) {
5379 addr
= list_entry(bp
->address_list
.next
,
5380 struct sctp_sockaddr_entry
, list
);
5381 if (sctp_is_any(sk
, &addr
->a
)) {
5382 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
5383 space_left
, &bytes_copied
);
5393 /* Protection on the bound address list is not needed since
5394 * in the socket option context we hold a socket lock and
5395 * thus the bound address list can't change.
5397 list_for_each_entry(addr
, &bp
->address_list
, list
) {
5398 memcpy(&temp
, &addr
->a
, sizeof(temp
));
5399 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5400 ->addr_to_user(sp
, &temp
);
5401 if (space_left
< addrlen
) {
5402 err
= -ENOMEM
; /*fixme: right error?*/
5405 memcpy(buf
, &temp
, addrlen
);
5407 bytes_copied
+= addrlen
;
5409 space_left
-= addrlen
;
5413 if (copy_to_user(to
, addrs
, bytes_copied
)) {
5417 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
5421 if (put_user(bytes_copied
, optlen
))
5428 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5430 * Requests that the local SCTP stack use the enclosed peer address as
5431 * the association primary. The enclosed address must be one of the
5432 * association peer's addresses.
5434 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
5435 char __user
*optval
, int __user
*optlen
)
5437 struct sctp_prim prim
;
5438 struct sctp_association
*asoc
;
5439 struct sctp_sock
*sp
= sctp_sk(sk
);
5441 if (len
< sizeof(struct sctp_prim
))
5444 len
= sizeof(struct sctp_prim
);
5446 if (copy_from_user(&prim
, optval
, len
))
5449 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
5453 if (!asoc
->peer
.primary_path
)
5456 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
5457 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
5459 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sp
,
5460 (union sctp_addr
*)&prim
.ssp_addr
);
5462 if (put_user(len
, optlen
))
5464 if (copy_to_user(optval
, &prim
, len
))
5471 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5473 * Requests that the local endpoint set the specified Adaptation Layer
5474 * Indication parameter for all future INIT and INIT-ACK exchanges.
5476 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
5477 char __user
*optval
, int __user
*optlen
)
5479 struct sctp_setadaptation adaptation
;
5481 if (len
< sizeof(struct sctp_setadaptation
))
5484 len
= sizeof(struct sctp_setadaptation
);
5486 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
5488 if (put_user(len
, optlen
))
5490 if (copy_to_user(optval
, &adaptation
, len
))
5498 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5500 * Applications that wish to use the sendto() system call may wish to
5501 * specify a default set of parameters that would normally be supplied
5502 * through the inclusion of ancillary data. This socket option allows
5503 * such an application to set the default sctp_sndrcvinfo structure.
5506 * The application that wishes to use this socket option simply passes
5507 * in to this call the sctp_sndrcvinfo structure defined in Section
5508 * 5.2.2) The input parameters accepted by this call include
5509 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5510 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5511 * to this call if the caller is using the UDP model.
5513 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5515 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
5516 int len
, char __user
*optval
,
5519 struct sctp_sock
*sp
= sctp_sk(sk
);
5520 struct sctp_association
*asoc
;
5521 struct sctp_sndrcvinfo info
;
5523 if (len
< sizeof(info
))
5528 if (copy_from_user(&info
, optval
, len
))
5531 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
5532 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
5535 info
.sinfo_stream
= asoc
->default_stream
;
5536 info
.sinfo_flags
= asoc
->default_flags
;
5537 info
.sinfo_ppid
= asoc
->default_ppid
;
5538 info
.sinfo_context
= asoc
->default_context
;
5539 info
.sinfo_timetolive
= asoc
->default_timetolive
;
5541 info
.sinfo_stream
= sp
->default_stream
;
5542 info
.sinfo_flags
= sp
->default_flags
;
5543 info
.sinfo_ppid
= sp
->default_ppid
;
5544 info
.sinfo_context
= sp
->default_context
;
5545 info
.sinfo_timetolive
= sp
->default_timetolive
;
5548 if (put_user(len
, optlen
))
5550 if (copy_to_user(optval
, &info
, len
))
5556 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5557 * (SCTP_DEFAULT_SNDINFO)
5559 static int sctp_getsockopt_default_sndinfo(struct sock
*sk
, int len
,
5560 char __user
*optval
,
5563 struct sctp_sock
*sp
= sctp_sk(sk
);
5564 struct sctp_association
*asoc
;
5565 struct sctp_sndinfo info
;
5567 if (len
< sizeof(info
))
5572 if (copy_from_user(&info
, optval
, len
))
5575 asoc
= sctp_id2assoc(sk
, info
.snd_assoc_id
);
5576 if (!asoc
&& info
.snd_assoc_id
&& sctp_style(sk
, UDP
))
5579 info
.snd_sid
= asoc
->default_stream
;
5580 info
.snd_flags
= asoc
->default_flags
;
5581 info
.snd_ppid
= asoc
->default_ppid
;
5582 info
.snd_context
= asoc
->default_context
;
5584 info
.snd_sid
= sp
->default_stream
;
5585 info
.snd_flags
= sp
->default_flags
;
5586 info
.snd_ppid
= sp
->default_ppid
;
5587 info
.snd_context
= sp
->default_context
;
5590 if (put_user(len
, optlen
))
5592 if (copy_to_user(optval
, &info
, len
))
5600 * 7.1.5 SCTP_NODELAY
5602 * Turn on/off any Nagle-like algorithm. This means that packets are
5603 * generally sent as soon as possible and no unnecessary delays are
5604 * introduced, at the cost of more packets in the network. Expects an
5605 * integer boolean flag.
5608 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
5609 char __user
*optval
, int __user
*optlen
)
5613 if (len
< sizeof(int))
5617 val
= (sctp_sk(sk
)->nodelay
== 1);
5618 if (put_user(len
, optlen
))
5620 if (copy_to_user(optval
, &val
, len
))
5627 * 7.1.1 SCTP_RTOINFO
5629 * The protocol parameters used to initialize and bound retransmission
5630 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5631 * and modify these parameters.
5632 * All parameters are time values, in milliseconds. A value of 0, when
5633 * modifying the parameters, indicates that the current value should not
5637 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
5638 char __user
*optval
,
5639 int __user
*optlen
) {
5640 struct sctp_rtoinfo rtoinfo
;
5641 struct sctp_association
*asoc
;
5643 if (len
< sizeof (struct sctp_rtoinfo
))
5646 len
= sizeof(struct sctp_rtoinfo
);
5648 if (copy_from_user(&rtoinfo
, optval
, len
))
5651 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
5653 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
5656 /* Values corresponding to the specific association. */
5658 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
5659 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
5660 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
5662 /* Values corresponding to the endpoint. */
5663 struct sctp_sock
*sp
= sctp_sk(sk
);
5665 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
5666 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
5667 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
5670 if (put_user(len
, optlen
))
5673 if (copy_to_user(optval
, &rtoinfo
, len
))
5681 * 7.1.2 SCTP_ASSOCINFO
5683 * This option is used to tune the maximum retransmission attempts
5684 * of the association.
5685 * Returns an error if the new association retransmission value is
5686 * greater than the sum of the retransmission value of the peer.
5687 * See [SCTP] for more information.
5690 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
5691 char __user
*optval
,
5695 struct sctp_assocparams assocparams
;
5696 struct sctp_association
*asoc
;
5697 struct list_head
*pos
;
5700 if (len
< sizeof (struct sctp_assocparams
))
5703 len
= sizeof(struct sctp_assocparams
);
5705 if (copy_from_user(&assocparams
, optval
, len
))
5708 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
5710 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
5713 /* Values correspoinding to the specific association */
5715 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
5716 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
5717 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
5718 assocparams
.sasoc_cookie_life
= ktime_to_ms(asoc
->cookie_life
);
5720 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
5724 assocparams
.sasoc_number_peer_destinations
= cnt
;
5726 /* Values corresponding to the endpoint */
5727 struct sctp_sock
*sp
= sctp_sk(sk
);
5729 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
5730 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
5731 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
5732 assocparams
.sasoc_cookie_life
=
5733 sp
->assocparams
.sasoc_cookie_life
;
5734 assocparams
.sasoc_number_peer_destinations
=
5736 sasoc_number_peer_destinations
;
5739 if (put_user(len
, optlen
))
5742 if (copy_to_user(optval
, &assocparams
, len
))
5749 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5751 * This socket option is a boolean flag which turns on or off mapped V4
5752 * addresses. If this option is turned on and the socket is type
5753 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5754 * If this option is turned off, then no mapping will be done of V4
5755 * addresses and a user will receive both PF_INET6 and PF_INET type
5756 * addresses on the socket.
5758 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
5759 char __user
*optval
, int __user
*optlen
)
5762 struct sctp_sock
*sp
= sctp_sk(sk
);
5764 if (len
< sizeof(int))
5769 if (put_user(len
, optlen
))
5771 if (copy_to_user(optval
, &val
, len
))
5778 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5779 * (chapter and verse is quoted at sctp_setsockopt_context())
5781 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
5782 char __user
*optval
, int __user
*optlen
)
5784 struct sctp_assoc_value params
;
5785 struct sctp_sock
*sp
;
5786 struct sctp_association
*asoc
;
5788 if (len
< sizeof(struct sctp_assoc_value
))
5791 len
= sizeof(struct sctp_assoc_value
);
5793 if (copy_from_user(¶ms
, optval
, len
))
5798 if (params
.assoc_id
!= 0) {
5799 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5802 params
.assoc_value
= asoc
->default_rcv_context
;
5804 params
.assoc_value
= sp
->default_rcv_context
;
5807 if (put_user(len
, optlen
))
5809 if (copy_to_user(optval
, ¶ms
, len
))
5816 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5817 * This option will get or set the maximum size to put in any outgoing
5818 * SCTP DATA chunk. If a message is larger than this size it will be
5819 * fragmented by SCTP into the specified size. Note that the underlying
5820 * SCTP implementation may fragment into smaller sized chunks when the
5821 * PMTU of the underlying association is smaller than the value set by
5822 * the user. The default value for this option is '0' which indicates
5823 * the user is NOT limiting fragmentation and only the PMTU will effect
5824 * SCTP's choice of DATA chunk size. Note also that values set larger
5825 * than the maximum size of an IP datagram will effectively let SCTP
5826 * control fragmentation (i.e. the same as setting this option to 0).
5828 * The following structure is used to access and modify this parameter:
5830 * struct sctp_assoc_value {
5831 * sctp_assoc_t assoc_id;
5832 * uint32_t assoc_value;
5835 * assoc_id: This parameter is ignored for one-to-one style sockets.
5836 * For one-to-many style sockets this parameter indicates which
5837 * association the user is performing an action upon. Note that if
5838 * this field's value is zero then the endpoints default value is
5839 * changed (effecting future associations only).
5840 * assoc_value: This parameter specifies the maximum size in bytes.
5842 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
5843 char __user
*optval
, int __user
*optlen
)
5845 struct sctp_assoc_value params
;
5846 struct sctp_association
*asoc
;
5848 if (len
== sizeof(int)) {
5849 pr_warn_ratelimited(DEPRECATED
5851 "Use of int in maxseg socket option.\n"
5852 "Use struct sctp_assoc_value instead\n",
5853 current
->comm
, task_pid_nr(current
));
5854 params
.assoc_id
= 0;
5855 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5856 len
= sizeof(struct sctp_assoc_value
);
5857 if (copy_from_user(¶ms
, optval
, sizeof(params
)))
5862 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5863 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
5867 params
.assoc_value
= asoc
->frag_point
;
5869 params
.assoc_value
= sctp_sk(sk
)->user_frag
;
5871 if (put_user(len
, optlen
))
5873 if (len
== sizeof(int)) {
5874 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5877 if (copy_to_user(optval
, ¶ms
, len
))
5885 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5886 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5888 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
5889 char __user
*optval
, int __user
*optlen
)
5893 if (len
< sizeof(int))
5898 val
= sctp_sk(sk
)->frag_interleave
;
5899 if (put_user(len
, optlen
))
5901 if (copy_to_user(optval
, &val
, len
))
5908 * 7.1.25. Set or Get the sctp partial delivery point
5909 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5911 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
5912 char __user
*optval
,
5917 if (len
< sizeof(u32
))
5922 val
= sctp_sk(sk
)->pd_point
;
5923 if (put_user(len
, optlen
))
5925 if (copy_to_user(optval
, &val
, len
))
5932 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5933 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5935 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5936 char __user
*optval
,
5939 struct sctp_assoc_value params
;
5940 struct sctp_sock
*sp
;
5941 struct sctp_association
*asoc
;
5943 if (len
== sizeof(int)) {
5944 pr_warn_ratelimited(DEPRECATED
5946 "Use of int in max_burst socket option.\n"
5947 "Use struct sctp_assoc_value instead\n",
5948 current
->comm
, task_pid_nr(current
));
5949 params
.assoc_id
= 0;
5950 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5951 len
= sizeof(struct sctp_assoc_value
);
5952 if (copy_from_user(¶ms
, optval
, len
))
5959 if (params
.assoc_id
!= 0) {
5960 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5963 params
.assoc_value
= asoc
->max_burst
;
5965 params
.assoc_value
= sp
->max_burst
;
5967 if (len
== sizeof(int)) {
5968 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5971 if (copy_to_user(optval
, ¶ms
, len
))
5979 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5980 char __user
*optval
, int __user
*optlen
)
5982 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
5983 struct sctp_hmacalgo __user
*p
= (void __user
*)optval
;
5984 struct sctp_hmac_algo_param
*hmacs
;
5989 if (!ep
->auth_enable
)
5992 hmacs
= ep
->auth_hmacs_list
;
5993 data_len
= ntohs(hmacs
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5995 if (len
< sizeof(struct sctp_hmacalgo
) + data_len
)
5998 len
= sizeof(struct sctp_hmacalgo
) + data_len
;
5999 num_idents
= data_len
/ sizeof(u16
);
6001 if (put_user(len
, optlen
))
6003 if (put_user(num_idents
, &p
->shmac_num_idents
))
6005 for (i
= 0; i
< num_idents
; i
++) {
6006 __u16 hmacid
= ntohs(hmacs
->hmac_ids
[i
]);
6008 if (copy_to_user(&p
->shmac_idents
[i
], &hmacid
, sizeof(__u16
)))
6014 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
6015 char __user
*optval
, int __user
*optlen
)
6017 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6018 struct sctp_authkeyid val
;
6019 struct sctp_association
*asoc
;
6021 if (!ep
->auth_enable
)
6024 if (len
< sizeof(struct sctp_authkeyid
))
6026 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
6029 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
6030 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
6034 val
.scact_keynumber
= asoc
->active_key_id
;
6036 val
.scact_keynumber
= ep
->active_key_id
;
6038 len
= sizeof(struct sctp_authkeyid
);
6039 if (put_user(len
, optlen
))
6041 if (copy_to_user(optval
, &val
, len
))
6047 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
6048 char __user
*optval
, int __user
*optlen
)
6050 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6051 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
6052 struct sctp_authchunks val
;
6053 struct sctp_association
*asoc
;
6054 struct sctp_chunks_param
*ch
;
6058 if (!ep
->auth_enable
)
6061 if (len
< sizeof(struct sctp_authchunks
))
6064 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
6067 to
= p
->gauth_chunks
;
6068 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
6072 ch
= asoc
->peer
.peer_chunks
;
6076 /* See if the user provided enough room for all the data */
6077 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
6078 if (len
< num_chunks
)
6081 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
6084 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
6085 if (put_user(len
, optlen
))
6087 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
6092 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
6093 char __user
*optval
, int __user
*optlen
)
6095 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6096 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
6097 struct sctp_authchunks val
;
6098 struct sctp_association
*asoc
;
6099 struct sctp_chunks_param
*ch
;
6103 if (!ep
->auth_enable
)
6106 if (len
< sizeof(struct sctp_authchunks
))
6109 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
6112 to
= p
->gauth_chunks
;
6113 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
6114 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
6118 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
6120 ch
= ep
->auth_chunk_list
;
6125 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
6126 if (len
< sizeof(struct sctp_authchunks
) + num_chunks
)
6129 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
6132 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
6133 if (put_user(len
, optlen
))
6135 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
6142 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6143 * This option gets the current number of associations that are attached
6144 * to a one-to-many style socket. The option value is an uint32_t.
6146 static int sctp_getsockopt_assoc_number(struct sock
*sk
, int len
,
6147 char __user
*optval
, int __user
*optlen
)
6149 struct sctp_sock
*sp
= sctp_sk(sk
);
6150 struct sctp_association
*asoc
;
6153 if (sctp_style(sk
, TCP
))
6156 if (len
< sizeof(u32
))
6161 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6165 if (put_user(len
, optlen
))
6167 if (copy_to_user(optval
, &val
, len
))
6174 * 8.1.23 SCTP_AUTO_ASCONF
6175 * See the corresponding setsockopt entry as description
6177 static int sctp_getsockopt_auto_asconf(struct sock
*sk
, int len
,
6178 char __user
*optval
, int __user
*optlen
)
6182 if (len
< sizeof(int))
6186 if (sctp_sk(sk
)->do_auto_asconf
&& sctp_is_ep_boundall(sk
))
6188 if (put_user(len
, optlen
))
6190 if (copy_to_user(optval
, &val
, len
))
6196 * 8.2.6. Get the Current Identifiers of Associations
6197 * (SCTP_GET_ASSOC_ID_LIST)
6199 * This option gets the current list of SCTP association identifiers of
6200 * the SCTP associations handled by a one-to-many style socket.
6202 static int sctp_getsockopt_assoc_ids(struct sock
*sk
, int len
,
6203 char __user
*optval
, int __user
*optlen
)
6205 struct sctp_sock
*sp
= sctp_sk(sk
);
6206 struct sctp_association
*asoc
;
6207 struct sctp_assoc_ids
*ids
;
6210 if (sctp_style(sk
, TCP
))
6213 if (len
< sizeof(struct sctp_assoc_ids
))
6216 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6220 if (len
< sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
)
6223 len
= sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
;
6225 ids
= kmalloc(len
, GFP_USER
| __GFP_NOWARN
);
6229 ids
->gaids_number_of_ids
= num
;
6231 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6232 ids
->gaids_assoc_id
[num
++] = asoc
->assoc_id
;
6235 if (put_user(len
, optlen
) || copy_to_user(optval
, ids
, len
)) {
6245 * SCTP_PEER_ADDR_THLDS
6247 * This option allows us to fetch the partially failed threshold for one or all
6248 * transports in an association. See Section 6.1 of:
6249 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6251 static int sctp_getsockopt_paddr_thresholds(struct sock
*sk
,
6252 char __user
*optval
,
6256 struct sctp_paddrthlds val
;
6257 struct sctp_transport
*trans
;
6258 struct sctp_association
*asoc
;
6260 if (len
< sizeof(struct sctp_paddrthlds
))
6262 len
= sizeof(struct sctp_paddrthlds
);
6263 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
, len
))
6266 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
6267 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
6271 val
.spt_pathpfthld
= asoc
->pf_retrans
;
6272 val
.spt_pathmaxrxt
= asoc
->pathmaxrxt
;
6274 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
6279 val
.spt_pathmaxrxt
= trans
->pathmaxrxt
;
6280 val
.spt_pathpfthld
= trans
->pf_retrans
;
6283 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
6290 * SCTP_GET_ASSOC_STATS
6292 * This option retrieves local per endpoint statistics. It is modeled
6293 * after OpenSolaris' implementation
6295 static int sctp_getsockopt_assoc_stats(struct sock
*sk
, int len
,
6296 char __user
*optval
,
6299 struct sctp_assoc_stats sas
;
6300 struct sctp_association
*asoc
= NULL
;
6302 /* User must provide at least the assoc id */
6303 if (len
< sizeof(sctp_assoc_t
))
6306 /* Allow the struct to grow and fill in as much as possible */
6307 len
= min_t(size_t, len
, sizeof(sas
));
6309 if (copy_from_user(&sas
, optval
, len
))
6312 asoc
= sctp_id2assoc(sk
, sas
.sas_assoc_id
);
6316 sas
.sas_rtxchunks
= asoc
->stats
.rtxchunks
;
6317 sas
.sas_gapcnt
= asoc
->stats
.gapcnt
;
6318 sas
.sas_outofseqtsns
= asoc
->stats
.outofseqtsns
;
6319 sas
.sas_osacks
= asoc
->stats
.osacks
;
6320 sas
.sas_isacks
= asoc
->stats
.isacks
;
6321 sas
.sas_octrlchunks
= asoc
->stats
.octrlchunks
;
6322 sas
.sas_ictrlchunks
= asoc
->stats
.ictrlchunks
;
6323 sas
.sas_oodchunks
= asoc
->stats
.oodchunks
;
6324 sas
.sas_iodchunks
= asoc
->stats
.iodchunks
;
6325 sas
.sas_ouodchunks
= asoc
->stats
.ouodchunks
;
6326 sas
.sas_iuodchunks
= asoc
->stats
.iuodchunks
;
6327 sas
.sas_idupchunks
= asoc
->stats
.idupchunks
;
6328 sas
.sas_opackets
= asoc
->stats
.opackets
;
6329 sas
.sas_ipackets
= asoc
->stats
.ipackets
;
6331 /* New high max rto observed, will return 0 if not a single
6332 * RTO update took place. obs_rto_ipaddr will be bogus
6335 sas
.sas_maxrto
= asoc
->stats
.max_obs_rto
;
6336 memcpy(&sas
.sas_obs_rto_ipaddr
, &asoc
->stats
.obs_rto_ipaddr
,
6337 sizeof(struct sockaddr_storage
));
6339 /* Mark beginning of a new observation period */
6340 asoc
->stats
.max_obs_rto
= asoc
->rto_min
;
6342 if (put_user(len
, optlen
))
6345 pr_debug("%s: len:%d, assoc_id:%d\n", __func__
, len
, sas
.sas_assoc_id
);
6347 if (copy_to_user(optval
, &sas
, len
))
6353 static int sctp_getsockopt_recvrcvinfo(struct sock
*sk
, int len
,
6354 char __user
*optval
,
6359 if (len
< sizeof(int))
6363 if (sctp_sk(sk
)->recvrcvinfo
)
6365 if (put_user(len
, optlen
))
6367 if (copy_to_user(optval
, &val
, len
))
6373 static int sctp_getsockopt_recvnxtinfo(struct sock
*sk
, int len
,
6374 char __user
*optval
,
6379 if (len
< sizeof(int))
6383 if (sctp_sk(sk
)->recvnxtinfo
)
6385 if (put_user(len
, optlen
))
6387 if (copy_to_user(optval
, &val
, len
))
6393 static int sctp_getsockopt_pr_supported(struct sock
*sk
, int len
,
6394 char __user
*optval
,
6397 struct sctp_assoc_value params
;
6398 struct sctp_association
*asoc
;
6399 int retval
= -EFAULT
;
6401 if (len
< sizeof(params
)) {
6406 len
= sizeof(params
);
6407 if (copy_from_user(¶ms
, optval
, len
))
6410 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6412 params
.assoc_value
= asoc
->prsctp_enable
;
6413 } else if (!params
.assoc_id
) {
6414 struct sctp_sock
*sp
= sctp_sk(sk
);
6416 params
.assoc_value
= sp
->ep
->prsctp_enable
;
6422 if (put_user(len
, optlen
))
6425 if (copy_to_user(optval
, ¶ms
, len
))
6434 static int sctp_getsockopt_default_prinfo(struct sock
*sk
, int len
,
6435 char __user
*optval
,
6438 struct sctp_default_prinfo info
;
6439 struct sctp_association
*asoc
;
6440 int retval
= -EFAULT
;
6442 if (len
< sizeof(info
)) {
6448 if (copy_from_user(&info
, optval
, len
))
6451 asoc
= sctp_id2assoc(sk
, info
.pr_assoc_id
);
6453 info
.pr_policy
= SCTP_PR_POLICY(asoc
->default_flags
);
6454 info
.pr_value
= asoc
->default_timetolive
;
6455 } else if (!info
.pr_assoc_id
) {
6456 struct sctp_sock
*sp
= sctp_sk(sk
);
6458 info
.pr_policy
= SCTP_PR_POLICY(sp
->default_flags
);
6459 info
.pr_value
= sp
->default_timetolive
;
6465 if (put_user(len
, optlen
))
6468 if (copy_to_user(optval
, &info
, len
))
6477 static int sctp_getsockopt_pr_assocstatus(struct sock
*sk
, int len
,
6478 char __user
*optval
,
6481 struct sctp_prstatus params
;
6482 struct sctp_association
*asoc
;
6484 int retval
= -EINVAL
;
6486 if (len
< sizeof(params
))
6489 len
= sizeof(params
);
6490 if (copy_from_user(¶ms
, optval
, len
)) {
6495 policy
= params
.sprstat_policy
;
6496 if (policy
& ~SCTP_PR_SCTP_MASK
)
6499 asoc
= sctp_id2assoc(sk
, params
.sprstat_assoc_id
);
6503 if (policy
== SCTP_PR_SCTP_NONE
) {
6504 params
.sprstat_abandoned_unsent
= 0;
6505 params
.sprstat_abandoned_sent
= 0;
6506 for (policy
= 0; policy
<= SCTP_PR_INDEX(MAX
); policy
++) {
6507 params
.sprstat_abandoned_unsent
+=
6508 asoc
->abandoned_unsent
[policy
];
6509 params
.sprstat_abandoned_sent
+=
6510 asoc
->abandoned_sent
[policy
];
6513 params
.sprstat_abandoned_unsent
=
6514 asoc
->abandoned_unsent
[__SCTP_PR_INDEX(policy
)];
6515 params
.sprstat_abandoned_sent
=
6516 asoc
->abandoned_sent
[__SCTP_PR_INDEX(policy
)];
6519 if (put_user(len
, optlen
)) {
6524 if (copy_to_user(optval
, ¶ms
, len
)) {
6535 static int sctp_getsockopt_enable_strreset(struct sock
*sk
, int len
,
6536 char __user
*optval
,
6539 struct sctp_assoc_value params
;
6540 struct sctp_association
*asoc
;
6541 int retval
= -EFAULT
;
6543 if (len
< sizeof(params
)) {
6548 len
= sizeof(params
);
6549 if (copy_from_user(¶ms
, optval
, len
))
6552 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6554 params
.assoc_value
= asoc
->strreset_enable
;
6555 } else if (!params
.assoc_id
) {
6556 struct sctp_sock
*sp
= sctp_sk(sk
);
6558 params
.assoc_value
= sp
->ep
->strreset_enable
;
6564 if (put_user(len
, optlen
))
6567 if (copy_to_user(optval
, ¶ms
, len
))
6576 static int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
6577 char __user
*optval
, int __user
*optlen
)
6582 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
6584 /* I can hardly begin to describe how wrong this is. This is
6585 * so broken as to be worse than useless. The API draft
6586 * REALLY is NOT helpful here... I am not convinced that the
6587 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
6588 * are at all well-founded.
6590 if (level
!= SOL_SCTP
) {
6591 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
6593 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
6597 if (get_user(len
, optlen
))
6607 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
6609 case SCTP_DISABLE_FRAGMENTS
:
6610 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
6614 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
6616 case SCTP_AUTOCLOSE
:
6617 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
6619 case SCTP_SOCKOPT_PEELOFF
:
6620 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
6622 case SCTP_PEER_ADDR_PARAMS
:
6623 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
6626 case SCTP_DELAYED_SACK
:
6627 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
6631 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
6633 case SCTP_GET_PEER_ADDRS
:
6634 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
6637 case SCTP_GET_LOCAL_ADDRS
:
6638 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
6641 case SCTP_SOCKOPT_CONNECTX3
:
6642 retval
= sctp_getsockopt_connectx3(sk
, len
, optval
, optlen
);
6644 case SCTP_DEFAULT_SEND_PARAM
:
6645 retval
= sctp_getsockopt_default_send_param(sk
, len
,
6648 case SCTP_DEFAULT_SNDINFO
:
6649 retval
= sctp_getsockopt_default_sndinfo(sk
, len
,
6652 case SCTP_PRIMARY_ADDR
:
6653 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
6656 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
6659 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
6661 case SCTP_ASSOCINFO
:
6662 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
6664 case SCTP_I_WANT_MAPPED_V4_ADDR
:
6665 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
6668 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
6670 case SCTP_GET_PEER_ADDR_INFO
:
6671 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
6674 case SCTP_ADAPTATION_LAYER
:
6675 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
6679 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
6681 case SCTP_FRAGMENT_INTERLEAVE
:
6682 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
6685 case SCTP_PARTIAL_DELIVERY_POINT
:
6686 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
6689 case SCTP_MAX_BURST
:
6690 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
6693 case SCTP_AUTH_CHUNK
:
6694 case SCTP_AUTH_DELETE_KEY
:
6695 retval
= -EOPNOTSUPP
;
6697 case SCTP_HMAC_IDENT
:
6698 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
6700 case SCTP_AUTH_ACTIVE_KEY
:
6701 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
6703 case SCTP_PEER_AUTH_CHUNKS
:
6704 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
6707 case SCTP_LOCAL_AUTH_CHUNKS
:
6708 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
6711 case SCTP_GET_ASSOC_NUMBER
:
6712 retval
= sctp_getsockopt_assoc_number(sk
, len
, optval
, optlen
);
6714 case SCTP_GET_ASSOC_ID_LIST
:
6715 retval
= sctp_getsockopt_assoc_ids(sk
, len
, optval
, optlen
);
6717 case SCTP_AUTO_ASCONF
:
6718 retval
= sctp_getsockopt_auto_asconf(sk
, len
, optval
, optlen
);
6720 case SCTP_PEER_ADDR_THLDS
:
6721 retval
= sctp_getsockopt_paddr_thresholds(sk
, optval
, len
, optlen
);
6723 case SCTP_GET_ASSOC_STATS
:
6724 retval
= sctp_getsockopt_assoc_stats(sk
, len
, optval
, optlen
);
6726 case SCTP_RECVRCVINFO
:
6727 retval
= sctp_getsockopt_recvrcvinfo(sk
, len
, optval
, optlen
);
6729 case SCTP_RECVNXTINFO
:
6730 retval
= sctp_getsockopt_recvnxtinfo(sk
, len
, optval
, optlen
);
6732 case SCTP_PR_SUPPORTED
:
6733 retval
= sctp_getsockopt_pr_supported(sk
, len
, optval
, optlen
);
6735 case SCTP_DEFAULT_PRINFO
:
6736 retval
= sctp_getsockopt_default_prinfo(sk
, len
, optval
,
6739 case SCTP_PR_ASSOC_STATUS
:
6740 retval
= sctp_getsockopt_pr_assocstatus(sk
, len
, optval
,
6743 case SCTP_ENABLE_STREAM_RESET
:
6744 retval
= sctp_getsockopt_enable_strreset(sk
, len
, optval
,
6748 retval
= -ENOPROTOOPT
;
6756 static int sctp_hash(struct sock
*sk
)
6762 static void sctp_unhash(struct sock
*sk
)
6767 /* Check if port is acceptable. Possibly find first available port.
6769 * The port hash table (contained in the 'global' SCTP protocol storage
6770 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6771 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6772 * list (the list number is the port number hashed out, so as you
6773 * would expect from a hash function, all the ports in a given list have
6774 * such a number that hashes out to the same list number; you were
6775 * expecting that, right?); so each list has a set of ports, with a
6776 * link to the socket (struct sock) that uses it, the port number and
6777 * a fastreuse flag (FIXME: NPI ipg).
6779 static struct sctp_bind_bucket
*sctp_bucket_create(
6780 struct sctp_bind_hashbucket
*head
, struct net
*, unsigned short snum
);
6782 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
6784 struct sctp_bind_hashbucket
*head
; /* hash list */
6785 struct sctp_bind_bucket
*pp
;
6786 unsigned short snum
;
6789 snum
= ntohs(addr
->v4
.sin_port
);
6791 pr_debug("%s: begins, snum:%d\n", __func__
, snum
);
6796 /* Search for an available port. */
6797 int low
, high
, remaining
, index
;
6799 struct net
*net
= sock_net(sk
);
6801 inet_get_local_port_range(net
, &low
, &high
);
6802 remaining
= (high
- low
) + 1;
6803 rover
= prandom_u32() % remaining
+ low
;
6807 if ((rover
< low
) || (rover
> high
))
6809 if (inet_is_local_reserved_port(net
, rover
))
6811 index
= sctp_phashfn(sock_net(sk
), rover
);
6812 head
= &sctp_port_hashtable
[index
];
6813 spin_lock(&head
->lock
);
6814 sctp_for_each_hentry(pp
, &head
->chain
)
6815 if ((pp
->port
== rover
) &&
6816 net_eq(sock_net(sk
), pp
->net
))
6820 spin_unlock(&head
->lock
);
6821 } while (--remaining
> 0);
6823 /* Exhausted local port range during search? */
6828 /* OK, here is the one we will use. HEAD (the port
6829 * hash table list entry) is non-NULL and we hold it's
6834 /* We are given an specific port number; we verify
6835 * that it is not being used. If it is used, we will
6836 * exahust the search in the hash list corresponding
6837 * to the port number (snum) - we detect that with the
6838 * port iterator, pp being NULL.
6840 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
), snum
)];
6841 spin_lock(&head
->lock
);
6842 sctp_for_each_hentry(pp
, &head
->chain
) {
6843 if ((pp
->port
== snum
) && net_eq(pp
->net
, sock_net(sk
)))
6850 if (!hlist_empty(&pp
->owner
)) {
6851 /* We had a port hash table hit - there is an
6852 * available port (pp != NULL) and it is being
6853 * used by other socket (pp->owner not empty); that other
6854 * socket is going to be sk2.
6856 int reuse
= sk
->sk_reuse
;
6859 pr_debug("%s: found a possible match\n", __func__
);
6861 if (pp
->fastreuse
&& sk
->sk_reuse
&&
6862 sk
->sk_state
!= SCTP_SS_LISTENING
)
6865 /* Run through the list of sockets bound to the port
6866 * (pp->port) [via the pointers bind_next and
6867 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
6868 * we get the endpoint they describe and run through
6869 * the endpoint's list of IP (v4 or v6) addresses,
6870 * comparing each of the addresses with the address of
6871 * the socket sk. If we find a match, then that means
6872 * that this port/socket (sk) combination are already
6875 sk_for_each_bound(sk2
, &pp
->owner
) {
6876 struct sctp_endpoint
*ep2
;
6877 ep2
= sctp_sk(sk2
)->ep
;
6880 (reuse
&& sk2
->sk_reuse
&&
6881 sk2
->sk_state
!= SCTP_SS_LISTENING
))
6884 if (sctp_bind_addr_conflict(&ep2
->base
.bind_addr
, addr
,
6885 sctp_sk(sk2
), sctp_sk(sk
))) {
6891 pr_debug("%s: found a match\n", __func__
);
6894 /* If there was a hash table miss, create a new port. */
6896 if (!pp
&& !(pp
= sctp_bucket_create(head
, sock_net(sk
), snum
)))
6899 /* In either case (hit or miss), make sure fastreuse is 1 only
6900 * if sk->sk_reuse is too (that is, if the caller requested
6901 * SO_REUSEADDR on this socket -sk-).
6903 if (hlist_empty(&pp
->owner
)) {
6904 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
6908 } else if (pp
->fastreuse
&&
6909 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
6912 /* We are set, so fill up all the data in the hash table
6913 * entry, tie the socket list information with the rest of the
6914 * sockets FIXME: Blurry, NPI (ipg).
6917 if (!sctp_sk(sk
)->bind_hash
) {
6918 inet_sk(sk
)->inet_num
= snum
;
6919 sk_add_bind_node(sk
, &pp
->owner
);
6920 sctp_sk(sk
)->bind_hash
= pp
;
6925 spin_unlock(&head
->lock
);
6932 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6933 * port is requested.
6935 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
6937 union sctp_addr addr
;
6938 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
6940 /* Set up a dummy address struct from the sk. */
6941 af
->from_sk(&addr
, sk
);
6942 addr
.v4
.sin_port
= htons(snum
);
6944 /* Note: sk->sk_num gets filled in if ephemeral port request. */
6945 return !!sctp_get_port_local(sk
, &addr
);
6949 * Move a socket to LISTENING state.
6951 static int sctp_listen_start(struct sock
*sk
, int backlog
)
6953 struct sctp_sock
*sp
= sctp_sk(sk
);
6954 struct sctp_endpoint
*ep
= sp
->ep
;
6955 struct crypto_shash
*tfm
= NULL
;
6958 /* Allocate HMAC for generating cookie. */
6959 if (!sp
->hmac
&& sp
->sctp_hmac_alg
) {
6960 sprintf(alg
, "hmac(%s)", sp
->sctp_hmac_alg
);
6961 tfm
= crypto_alloc_shash(alg
, 0, 0);
6963 net_info_ratelimited("failed to load transform for %s: %ld\n",
6964 sp
->sctp_hmac_alg
, PTR_ERR(tfm
));
6967 sctp_sk(sk
)->hmac
= tfm
;
6971 * If a bind() or sctp_bindx() is not called prior to a listen()
6972 * call that allows new associations to be accepted, the system
6973 * picks an ephemeral port and will choose an address set equivalent
6974 * to binding with a wildcard address.
6976 * This is not currently spelled out in the SCTP sockets
6977 * extensions draft, but follows the practice as seen in TCP
6981 sk
->sk_state
= SCTP_SS_LISTENING
;
6982 if (!ep
->base
.bind_addr
.port
) {
6983 if (sctp_autobind(sk
))
6986 if (sctp_get_port(sk
, inet_sk(sk
)->inet_num
)) {
6987 sk
->sk_state
= SCTP_SS_CLOSED
;
6992 sk
->sk_max_ack_backlog
= backlog
;
6993 sctp_hash_endpoint(ep
);
6998 * 4.1.3 / 5.1.3 listen()
7000 * By default, new associations are not accepted for UDP style sockets.
7001 * An application uses listen() to mark a socket as being able to
7002 * accept new associations.
7004 * On TCP style sockets, applications use listen() to ready the SCTP
7005 * endpoint for accepting inbound associations.
7007 * On both types of endpoints a backlog of '0' disables listening.
7009 * Move a socket to LISTENING state.
7011 int sctp_inet_listen(struct socket
*sock
, int backlog
)
7013 struct sock
*sk
= sock
->sk
;
7014 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
7017 if (unlikely(backlog
< 0))
7022 /* Peeled-off sockets are not allowed to listen(). */
7023 if (sctp_style(sk
, UDP_HIGH_BANDWIDTH
))
7026 if (sock
->state
!= SS_UNCONNECTED
)
7029 /* If backlog is zero, disable listening. */
7031 if (sctp_sstate(sk
, CLOSED
))
7035 sctp_unhash_endpoint(ep
);
7036 sk
->sk_state
= SCTP_SS_CLOSED
;
7038 sctp_sk(sk
)->bind_hash
->fastreuse
= 1;
7042 /* If we are already listening, just update the backlog */
7043 if (sctp_sstate(sk
, LISTENING
))
7044 sk
->sk_max_ack_backlog
= backlog
;
7046 err
= sctp_listen_start(sk
, backlog
);
7058 * This function is done by modeling the current datagram_poll() and the
7059 * tcp_poll(). Note that, based on these implementations, we don't
7060 * lock the socket in this function, even though it seems that,
7061 * ideally, locking or some other mechanisms can be used to ensure
7062 * the integrity of the counters (sndbuf and wmem_alloc) used
7063 * in this place. We assume that we don't need locks either until proven
7066 * Another thing to note is that we include the Async I/O support
7067 * here, again, by modeling the current TCP/UDP code. We don't have
7068 * a good way to test with it yet.
7070 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
7072 struct sock
*sk
= sock
->sk
;
7073 struct sctp_sock
*sp
= sctp_sk(sk
);
7076 poll_wait(file
, sk_sleep(sk
), wait
);
7078 sock_rps_record_flow(sk
);
7080 /* A TCP-style listening socket becomes readable when the accept queue
7083 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
7084 return (!list_empty(&sp
->ep
->asocs
)) ?
7085 (POLLIN
| POLLRDNORM
) : 0;
7089 /* Is there any exceptional events? */
7090 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
7092 (sock_flag(sk
, SOCK_SELECT_ERR_QUEUE
) ? POLLPRI
: 0);
7093 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7094 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
7095 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
7098 /* Is it readable? Reconsider this code with TCP-style support. */
7099 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7100 mask
|= POLLIN
| POLLRDNORM
;
7102 /* The association is either gone or not ready. */
7103 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
7106 /* Is it writable? */
7107 if (sctp_writeable(sk
)) {
7108 mask
|= POLLOUT
| POLLWRNORM
;
7110 sk_set_bit(SOCKWQ_ASYNC_NOSPACE
, sk
);
7112 * Since the socket is not locked, the buffer
7113 * might be made available after the writeable check and
7114 * before the bit is set. This could cause a lost I/O
7115 * signal. tcp_poll() has a race breaker for this race
7116 * condition. Based on their implementation, we put
7117 * in the following code to cover it as well.
7119 if (sctp_writeable(sk
))
7120 mask
|= POLLOUT
| POLLWRNORM
;
7125 /********************************************************************
7126 * 2nd Level Abstractions
7127 ********************************************************************/
7129 static struct sctp_bind_bucket
*sctp_bucket_create(
7130 struct sctp_bind_hashbucket
*head
, struct net
*net
, unsigned short snum
)
7132 struct sctp_bind_bucket
*pp
;
7134 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
7136 SCTP_DBG_OBJCNT_INC(bind_bucket
);
7139 INIT_HLIST_HEAD(&pp
->owner
);
7141 hlist_add_head(&pp
->node
, &head
->chain
);
7146 /* Caller must hold hashbucket lock for this tb with local BH disabled */
7147 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
7149 if (pp
&& hlist_empty(&pp
->owner
)) {
7150 __hlist_del(&pp
->node
);
7151 kmem_cache_free(sctp_bucket_cachep
, pp
);
7152 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
7156 /* Release this socket's reference to a local port. */
7157 static inline void __sctp_put_port(struct sock
*sk
)
7159 struct sctp_bind_hashbucket
*head
=
7160 &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
),
7161 inet_sk(sk
)->inet_num
)];
7162 struct sctp_bind_bucket
*pp
;
7164 spin_lock(&head
->lock
);
7165 pp
= sctp_sk(sk
)->bind_hash
;
7166 __sk_del_bind_node(sk
);
7167 sctp_sk(sk
)->bind_hash
= NULL
;
7168 inet_sk(sk
)->inet_num
= 0;
7169 sctp_bucket_destroy(pp
);
7170 spin_unlock(&head
->lock
);
7173 void sctp_put_port(struct sock
*sk
)
7176 __sctp_put_port(sk
);
7181 * The system picks an ephemeral port and choose an address set equivalent
7182 * to binding with a wildcard address.
7183 * One of those addresses will be the primary address for the association.
7184 * This automatically enables the multihoming capability of SCTP.
7186 static int sctp_autobind(struct sock
*sk
)
7188 union sctp_addr autoaddr
;
7192 /* Initialize a local sockaddr structure to INADDR_ANY. */
7193 af
= sctp_sk(sk
)->pf
->af
;
7195 port
= htons(inet_sk(sk
)->inet_num
);
7196 af
->inaddr_any(&autoaddr
, port
);
7198 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
7201 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
7204 * 4.2 The cmsghdr Structure *
7206 * When ancillary data is sent or received, any number of ancillary data
7207 * objects can be specified by the msg_control and msg_controllen members of
7208 * the msghdr structure, because each object is preceded by
7209 * a cmsghdr structure defining the object's length (the cmsg_len member).
7210 * Historically Berkeley-derived implementations have passed only one object
7211 * at a time, but this API allows multiple objects to be
7212 * passed in a single call to sendmsg() or recvmsg(). The following example
7213 * shows two ancillary data objects in a control buffer.
7215 * |<--------------------------- msg_controllen -------------------------->|
7218 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
7220 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
7223 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
7225 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
7228 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7229 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
7231 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
7233 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7240 static int sctp_msghdr_parse(const struct msghdr
*msg
, sctp_cmsgs_t
*cmsgs
)
7242 struct cmsghdr
*cmsg
;
7243 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
7245 for_each_cmsghdr(cmsg
, my_msg
) {
7246 if (!CMSG_OK(my_msg
, cmsg
))
7249 /* Should we parse this header or ignore? */
7250 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
7253 /* Strictly check lengths following example in SCM code. */
7254 switch (cmsg
->cmsg_type
) {
7256 /* SCTP Socket API Extension
7257 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
7259 * This cmsghdr structure provides information for
7260 * initializing new SCTP associations with sendmsg().
7261 * The SCTP_INITMSG socket option uses this same data
7262 * structure. This structure is not used for
7265 * cmsg_level cmsg_type cmsg_data[]
7266 * ------------ ------------ ----------------------
7267 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
7269 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_initmsg
)))
7272 cmsgs
->init
= CMSG_DATA(cmsg
);
7276 /* SCTP Socket API Extension
7277 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
7279 * This cmsghdr structure specifies SCTP options for
7280 * sendmsg() and describes SCTP header information
7281 * about a received message through recvmsg().
7283 * cmsg_level cmsg_type cmsg_data[]
7284 * ------------ ------------ ----------------------
7285 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
7287 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
7290 cmsgs
->srinfo
= CMSG_DATA(cmsg
);
7292 if (cmsgs
->srinfo
->sinfo_flags
&
7293 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
7294 SCTP_SACK_IMMEDIATELY
| SCTP_PR_SCTP_MASK
|
7295 SCTP_ABORT
| SCTP_EOF
))
7300 /* SCTP Socket API Extension
7301 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
7303 * This cmsghdr structure specifies SCTP options for
7304 * sendmsg(). This structure and SCTP_RCVINFO replaces
7305 * SCTP_SNDRCV which has been deprecated.
7307 * cmsg_level cmsg_type cmsg_data[]
7308 * ------------ ------------ ---------------------
7309 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
7311 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_sndinfo
)))
7314 cmsgs
->sinfo
= CMSG_DATA(cmsg
);
7316 if (cmsgs
->sinfo
->snd_flags
&
7317 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
7318 SCTP_SACK_IMMEDIATELY
| SCTP_PR_SCTP_MASK
|
7319 SCTP_ABORT
| SCTP_EOF
))
7331 * Wait for a packet..
7332 * Note: This function is the same function as in core/datagram.c
7333 * with a few modifications to make lksctp work.
7335 static int sctp_wait_for_packet(struct sock
*sk
, int *err
, long *timeo_p
)
7340 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
7342 /* Socket errors? */
7343 error
= sock_error(sk
);
7347 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7350 /* Socket shut down? */
7351 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7354 /* Sequenced packets can come disconnected. If so we report the
7359 /* Is there a good reason to think that we may receive some data? */
7360 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
7363 /* Handle signals. */
7364 if (signal_pending(current
))
7367 /* Let another process have a go. Since we are going to sleep
7368 * anyway. Note: This may cause odd behaviors if the message
7369 * does not fit in the user's buffer, but this seems to be the
7370 * only way to honor MSG_DONTWAIT realistically.
7373 *timeo_p
= schedule_timeout(*timeo_p
);
7377 finish_wait(sk_sleep(sk
), &wait
);
7381 error
= sock_intr_errno(*timeo_p
);
7384 finish_wait(sk_sleep(sk
), &wait
);
7389 /* Receive a datagram.
7390 * Note: This is pretty much the same routine as in core/datagram.c
7391 * with a few changes to make lksctp work.
7393 struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
7394 int noblock
, int *err
)
7397 struct sk_buff
*skb
;
7400 timeo
= sock_rcvtimeo(sk
, noblock
);
7402 pr_debug("%s: timeo:%ld, max:%ld\n", __func__
, timeo
,
7403 MAX_SCHEDULE_TIMEOUT
);
7406 /* Again only user level code calls this function,
7407 * so nothing interrupt level
7408 * will suddenly eat the receive_queue.
7410 * Look at current nfs client by the way...
7411 * However, this function was correct in any case. 8)
7413 if (flags
& MSG_PEEK
) {
7414 skb
= skb_peek(&sk
->sk_receive_queue
);
7416 atomic_inc(&skb
->users
);
7418 skb
= __skb_dequeue(&sk
->sk_receive_queue
);
7424 /* Caller is allowed not to check sk->sk_err before calling. */
7425 error
= sock_error(sk
);
7429 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7432 if (sk_can_busy_loop(sk
) &&
7433 sk_busy_loop(sk
, noblock
))
7436 /* User doesn't want to wait. */
7440 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
7449 /* If sndbuf has changed, wake up per association sndbuf waiters. */
7450 static void __sctp_write_space(struct sctp_association
*asoc
)
7452 struct sock
*sk
= asoc
->base
.sk
;
7454 if (sctp_wspace(asoc
) <= 0)
7457 if (waitqueue_active(&asoc
->wait
))
7458 wake_up_interruptible(&asoc
->wait
);
7460 if (sctp_writeable(sk
)) {
7461 struct socket_wq
*wq
;
7464 wq
= rcu_dereference(sk
->sk_wq
);
7466 if (waitqueue_active(&wq
->wait
))
7467 wake_up_interruptible(&wq
->wait
);
7469 /* Note that we try to include the Async I/O support
7470 * here by modeling from the current TCP/UDP code.
7471 * We have not tested with it yet.
7473 if (!(sk
->sk_shutdown
& SEND_SHUTDOWN
))
7474 sock_wake_async(wq
, SOCK_WAKE_SPACE
, POLL_OUT
);
7480 static void sctp_wake_up_waiters(struct sock
*sk
,
7481 struct sctp_association
*asoc
)
7483 struct sctp_association
*tmp
= asoc
;
7485 /* We do accounting for the sndbuf space per association,
7486 * so we only need to wake our own association.
7488 if (asoc
->ep
->sndbuf_policy
)
7489 return __sctp_write_space(asoc
);
7491 /* If association goes down and is just flushing its
7492 * outq, then just normally notify others.
7494 if (asoc
->base
.dead
)
7495 return sctp_write_space(sk
);
7497 /* Accounting for the sndbuf space is per socket, so we
7498 * need to wake up others, try to be fair and in case of
7499 * other associations, let them have a go first instead
7500 * of just doing a sctp_write_space() call.
7502 * Note that we reach sctp_wake_up_waiters() only when
7503 * associations free up queued chunks, thus we are under
7504 * lock and the list of associations on a socket is
7505 * guaranteed not to change.
7507 for (tmp
= list_next_entry(tmp
, asocs
); 1;
7508 tmp
= list_next_entry(tmp
, asocs
)) {
7509 /* Manually skip the head element. */
7510 if (&tmp
->asocs
== &((sctp_sk(sk
))->ep
->asocs
))
7512 /* Wake up association. */
7513 __sctp_write_space(tmp
);
7514 /* We've reached the end. */
7520 /* Do accounting for the sndbuf space.
7521 * Decrement the used sndbuf space of the corresponding association by the
7522 * data size which was just transmitted(freed).
7524 static void sctp_wfree(struct sk_buff
*skb
)
7526 struct sctp_chunk
*chunk
= skb_shinfo(skb
)->destructor_arg
;
7527 struct sctp_association
*asoc
= chunk
->asoc
;
7528 struct sock
*sk
= asoc
->base
.sk
;
7530 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
7531 sizeof(struct sk_buff
) +
7532 sizeof(struct sctp_chunk
);
7534 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
7537 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
7539 sk
->sk_wmem_queued
-= skb
->truesize
;
7540 sk_mem_uncharge(sk
, skb
->truesize
);
7543 sctp_wake_up_waiters(sk
, asoc
);
7545 sctp_association_put(asoc
);
7548 /* Do accounting for the receive space on the socket.
7549 * Accounting for the association is done in ulpevent.c
7550 * We set this as a destructor for the cloned data skbs so that
7551 * accounting is done at the correct time.
7553 void sctp_sock_rfree(struct sk_buff
*skb
)
7555 struct sock
*sk
= skb
->sk
;
7556 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
7558 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
7561 * Mimic the behavior of sock_rfree
7563 sk_mem_uncharge(sk
, event
->rmem_len
);
7567 /* Helper function to wait for space in the sndbuf. */
7568 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
7571 struct sock
*sk
= asoc
->base
.sk
;
7573 long current_timeo
= *timeo_p
;
7576 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__
, asoc
,
7579 /* Increment the association's refcnt. */
7580 sctp_association_hold(asoc
);
7582 /* Wait on the association specific sndbuf space. */
7584 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
7585 TASK_INTERRUPTIBLE
);
7588 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
7591 if (signal_pending(current
))
7592 goto do_interrupted
;
7593 if (msg_len
<= sctp_wspace(asoc
))
7596 /* Let another process have a go. Since we are going
7600 current_timeo
= schedule_timeout(current_timeo
);
7601 if (sk
!= asoc
->base
.sk
)
7605 *timeo_p
= current_timeo
;
7609 finish_wait(&asoc
->wait
, &wait
);
7611 /* Release the association's refcnt. */
7612 sctp_association_put(asoc
);
7621 err
= sock_intr_errno(*timeo_p
);
7629 void sctp_data_ready(struct sock
*sk
)
7631 struct socket_wq
*wq
;
7634 wq
= rcu_dereference(sk
->sk_wq
);
7635 if (skwq_has_sleeper(wq
))
7636 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
7637 POLLRDNORM
| POLLRDBAND
);
7638 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
7642 /* If socket sndbuf has changed, wake up all per association waiters. */
7643 void sctp_write_space(struct sock
*sk
)
7645 struct sctp_association
*asoc
;
7647 /* Wake up the tasks in each wait queue. */
7648 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
7649 __sctp_write_space(asoc
);
7653 /* Is there any sndbuf space available on the socket?
7655 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
7656 * associations on the same socket. For a UDP-style socket with
7657 * multiple associations, it is possible for it to be "unwriteable"
7658 * prematurely. I assume that this is acceptable because
7659 * a premature "unwriteable" is better than an accidental "writeable" which
7660 * would cause an unwanted block under certain circumstances. For the 1-1
7661 * UDP-style sockets or TCP-style sockets, this code should work.
7664 static int sctp_writeable(struct sock
*sk
)
7668 amt
= sk
->sk_sndbuf
- sk_wmem_alloc_get(sk
);
7674 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7675 * returns immediately with EINPROGRESS.
7677 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
7679 struct sock
*sk
= asoc
->base
.sk
;
7681 long current_timeo
= *timeo_p
;
7684 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__
, asoc
, *timeo_p
);
7686 /* Increment the association's refcnt. */
7687 sctp_association_hold(asoc
);
7690 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
7691 TASK_INTERRUPTIBLE
);
7694 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7696 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
7699 if (signal_pending(current
))
7700 goto do_interrupted
;
7702 if (sctp_state(asoc
, ESTABLISHED
))
7705 /* Let another process have a go. Since we are going
7709 current_timeo
= schedule_timeout(current_timeo
);
7712 *timeo_p
= current_timeo
;
7716 finish_wait(&asoc
->wait
, &wait
);
7718 /* Release the association's refcnt. */
7719 sctp_association_put(asoc
);
7724 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
7727 err
= -ECONNREFUSED
;
7731 err
= sock_intr_errno(*timeo_p
);
7739 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
7741 struct sctp_endpoint
*ep
;
7745 ep
= sctp_sk(sk
)->ep
;
7749 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
7750 TASK_INTERRUPTIBLE
);
7752 if (list_empty(&ep
->asocs
)) {
7754 timeo
= schedule_timeout(timeo
);
7759 if (!sctp_sstate(sk
, LISTENING
))
7763 if (!list_empty(&ep
->asocs
))
7766 err
= sock_intr_errno(timeo
);
7767 if (signal_pending(current
))
7775 finish_wait(sk_sleep(sk
), &wait
);
7780 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
7785 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
7786 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
7789 timeout
= schedule_timeout(timeout
);
7791 } while (!signal_pending(current
) && timeout
);
7793 finish_wait(sk_sleep(sk
), &wait
);
7796 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
7798 struct sk_buff
*frag
;
7803 /* Don't forget the fragments. */
7804 skb_walk_frags(skb
, frag
)
7805 sctp_skb_set_owner_r_frag(frag
, sk
);
7808 sctp_skb_set_owner_r(skb
, sk
);
7811 void sctp_copy_sock(struct sock
*newsk
, struct sock
*sk
,
7812 struct sctp_association
*asoc
)
7814 struct inet_sock
*inet
= inet_sk(sk
);
7815 struct inet_sock
*newinet
;
7817 newsk
->sk_type
= sk
->sk_type
;
7818 newsk
->sk_bound_dev_if
= sk
->sk_bound_dev_if
;
7819 newsk
->sk_flags
= sk
->sk_flags
;
7820 newsk
->sk_tsflags
= sk
->sk_tsflags
;
7821 newsk
->sk_no_check_tx
= sk
->sk_no_check_tx
;
7822 newsk
->sk_no_check_rx
= sk
->sk_no_check_rx
;
7823 newsk
->sk_reuse
= sk
->sk_reuse
;
7825 newsk
->sk_shutdown
= sk
->sk_shutdown
;
7826 newsk
->sk_destruct
= sctp_destruct_sock
;
7827 newsk
->sk_family
= sk
->sk_family
;
7828 newsk
->sk_protocol
= IPPROTO_SCTP
;
7829 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
7830 newsk
->sk_sndbuf
= sk
->sk_sndbuf
;
7831 newsk
->sk_rcvbuf
= sk
->sk_rcvbuf
;
7832 newsk
->sk_lingertime
= sk
->sk_lingertime
;
7833 newsk
->sk_rcvtimeo
= sk
->sk_rcvtimeo
;
7834 newsk
->sk_sndtimeo
= sk
->sk_sndtimeo
;
7835 newsk
->sk_rxhash
= sk
->sk_rxhash
;
7837 newinet
= inet_sk(newsk
);
7839 /* Initialize sk's sport, dport, rcv_saddr and daddr for
7840 * getsockname() and getpeername()
7842 newinet
->inet_sport
= inet
->inet_sport
;
7843 newinet
->inet_saddr
= inet
->inet_saddr
;
7844 newinet
->inet_rcv_saddr
= inet
->inet_rcv_saddr
;
7845 newinet
->inet_dport
= htons(asoc
->peer
.port
);
7846 newinet
->pmtudisc
= inet
->pmtudisc
;
7847 newinet
->inet_id
= asoc
->next_tsn
^ jiffies
;
7849 newinet
->uc_ttl
= inet
->uc_ttl
;
7850 newinet
->mc_loop
= 1;
7851 newinet
->mc_ttl
= 1;
7852 newinet
->mc_index
= 0;
7853 newinet
->mc_list
= NULL
;
7855 if (newsk
->sk_flags
& SK_FLAGS_TIMESTAMP
)
7856 net_enable_timestamp();
7858 security_sk_clone(sk
, newsk
);
7861 static inline void sctp_copy_descendant(struct sock
*sk_to
,
7862 const struct sock
*sk_from
)
7864 int ancestor_size
= sizeof(struct inet_sock
) +
7865 sizeof(struct sctp_sock
) -
7866 offsetof(struct sctp_sock
, auto_asconf_list
);
7868 if (sk_from
->sk_family
== PF_INET6
)
7869 ancestor_size
+= sizeof(struct ipv6_pinfo
);
7871 __inet_sk_copy_descendant(sk_to
, sk_from
, ancestor_size
);
7874 /* Populate the fields of the newsk from the oldsk and migrate the assoc
7875 * and its messages to the newsk.
7877 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
7878 struct sctp_association
*assoc
,
7879 sctp_socket_type_t type
)
7881 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
7882 struct sctp_sock
*newsp
= sctp_sk(newsk
);
7883 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
7884 struct sctp_endpoint
*newep
= newsp
->ep
;
7885 struct sk_buff
*skb
, *tmp
;
7886 struct sctp_ulpevent
*event
;
7887 struct sctp_bind_hashbucket
*head
;
7889 /* Migrate socket buffer sizes and all the socket level options to the
7892 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
7893 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
7894 /* Brute force copy old sctp opt. */
7895 sctp_copy_descendant(newsk
, oldsk
);
7897 /* Restore the ep value that was overwritten with the above structure
7903 /* Hook this new socket in to the bind_hash list. */
7904 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(oldsk
),
7905 inet_sk(oldsk
)->inet_num
)];
7906 spin_lock_bh(&head
->lock
);
7907 pp
= sctp_sk(oldsk
)->bind_hash
;
7908 sk_add_bind_node(newsk
, &pp
->owner
);
7909 sctp_sk(newsk
)->bind_hash
= pp
;
7910 inet_sk(newsk
)->inet_num
= inet_sk(oldsk
)->inet_num
;
7911 spin_unlock_bh(&head
->lock
);
7913 /* Copy the bind_addr list from the original endpoint to the new
7914 * endpoint so that we can handle restarts properly
7916 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
7917 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
7919 /* Move any messages in the old socket's receive queue that are for the
7920 * peeled off association to the new socket's receive queue.
7922 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
7923 event
= sctp_skb2event(skb
);
7924 if (event
->asoc
== assoc
) {
7925 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
7926 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
7927 sctp_skb_set_owner_r_frag(skb
, newsk
);
7931 /* Clean up any messages pending delivery due to partial
7932 * delivery. Three cases:
7933 * 1) No partial deliver; no work.
7934 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
7935 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
7937 skb_queue_head_init(&newsp
->pd_lobby
);
7938 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
7940 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
7941 struct sk_buff_head
*queue
;
7943 /* Decide which queue to move pd_lobby skbs to. */
7944 if (assoc
->ulpq
.pd_mode
) {
7945 queue
= &newsp
->pd_lobby
;
7947 queue
= &newsk
->sk_receive_queue
;
7949 /* Walk through the pd_lobby, looking for skbs that
7950 * need moved to the new socket.
7952 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
7953 event
= sctp_skb2event(skb
);
7954 if (event
->asoc
== assoc
) {
7955 __skb_unlink(skb
, &oldsp
->pd_lobby
);
7956 __skb_queue_tail(queue
, skb
);
7957 sctp_skb_set_owner_r_frag(skb
, newsk
);
7961 /* Clear up any skbs waiting for the partial
7962 * delivery to finish.
7964 if (assoc
->ulpq
.pd_mode
)
7965 sctp_clear_pd(oldsk
, NULL
);
7969 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
)
7970 sctp_skb_set_owner_r_frag(skb
, newsk
);
7972 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
)
7973 sctp_skb_set_owner_r_frag(skb
, newsk
);
7975 /* Set the type of socket to indicate that it is peeled off from the
7976 * original UDP-style socket or created with the accept() call on a
7977 * TCP-style socket..
7981 /* Mark the new socket "in-use" by the user so that any packets
7982 * that may arrive on the association after we've moved it are
7983 * queued to the backlog. This prevents a potential race between
7984 * backlog processing on the old socket and new-packet processing
7985 * on the new socket.
7987 * The caller has just allocated newsk so we can guarantee that other
7988 * paths won't try to lock it and then oldsk.
7990 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
7991 sctp_assoc_migrate(assoc
, newsk
);
7993 /* If the association on the newsk is already closed before accept()
7994 * is called, set RCV_SHUTDOWN flag.
7996 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
)) {
7997 newsk
->sk_state
= SCTP_SS_CLOSED
;
7998 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
8000 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
8003 release_sock(newsk
);
8007 /* This proto struct describes the ULP interface for SCTP. */
8008 struct proto sctp_prot
= {
8010 .owner
= THIS_MODULE
,
8011 .close
= sctp_close
,
8012 .connect
= sctp_connect
,
8013 .disconnect
= sctp_disconnect
,
8014 .accept
= sctp_accept
,
8015 .ioctl
= sctp_ioctl
,
8016 .init
= sctp_init_sock
,
8017 .destroy
= sctp_destroy_sock
,
8018 .shutdown
= sctp_shutdown
,
8019 .setsockopt
= sctp_setsockopt
,
8020 .getsockopt
= sctp_getsockopt
,
8021 .sendmsg
= sctp_sendmsg
,
8022 .recvmsg
= sctp_recvmsg
,
8024 .backlog_rcv
= sctp_backlog_rcv
,
8026 .unhash
= sctp_unhash
,
8027 .get_port
= sctp_get_port
,
8028 .obj_size
= sizeof(struct sctp_sock
),
8029 .sysctl_mem
= sysctl_sctp_mem
,
8030 .sysctl_rmem
= sysctl_sctp_rmem
,
8031 .sysctl_wmem
= sysctl_sctp_wmem
,
8032 .memory_pressure
= &sctp_memory_pressure
,
8033 .enter_memory_pressure
= sctp_enter_memory_pressure
,
8034 .memory_allocated
= &sctp_memory_allocated
,
8035 .sockets_allocated
= &sctp_sockets_allocated
,
8038 #if IS_ENABLED(CONFIG_IPV6)
8040 #include <net/transp_v6.h>
8041 static void sctp_v6_destroy_sock(struct sock
*sk
)
8043 sctp_destroy_sock(sk
);
8044 inet6_destroy_sock(sk
);
8047 struct proto sctpv6_prot
= {
8049 .owner
= THIS_MODULE
,
8050 .close
= sctp_close
,
8051 .connect
= sctp_connect
,
8052 .disconnect
= sctp_disconnect
,
8053 .accept
= sctp_accept
,
8054 .ioctl
= sctp_ioctl
,
8055 .init
= sctp_init_sock
,
8056 .destroy
= sctp_v6_destroy_sock
,
8057 .shutdown
= sctp_shutdown
,
8058 .setsockopt
= sctp_setsockopt
,
8059 .getsockopt
= sctp_getsockopt
,
8060 .sendmsg
= sctp_sendmsg
,
8061 .recvmsg
= sctp_recvmsg
,
8063 .backlog_rcv
= sctp_backlog_rcv
,
8065 .unhash
= sctp_unhash
,
8066 .get_port
= sctp_get_port
,
8067 .obj_size
= sizeof(struct sctp6_sock
),
8068 .sysctl_mem
= sysctl_sctp_mem
,
8069 .sysctl_rmem
= sysctl_sctp_rmem
,
8070 .sysctl_wmem
= sysctl_sctp_wmem
,
8071 .memory_pressure
= &sctp_memory_pressure
,
8072 .enter_memory_pressure
= sctp_enter_memory_pressure
,
8073 .memory_allocated
= &sctp_memory_allocated
,
8074 .sockets_allocated
= &sctp_sockets_allocated
,
8076 #endif /* IS_ENABLED(CONFIG_IPV6) */