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 (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 dst_release(trans
->dst
);
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 dst_release(transport
->dst
);
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 /* API 6.2 setsockopt(), getsockopt()
3823 * Applications use setsockopt() and getsockopt() to set or retrieve
3824 * socket options. Socket options are used to change the default
3825 * behavior of sockets calls. They are described in Section 7.
3829 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3830 * int __user *optlen);
3831 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3834 * sd - the socket descript.
3835 * level - set to IPPROTO_SCTP for all SCTP options.
3836 * optname - the option name.
3837 * optval - the buffer to store the value of the option.
3838 * optlen - the size of the buffer.
3840 static int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3841 char __user
*optval
, unsigned int optlen
)
3845 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
3847 /* I can hardly begin to describe how wrong this is. This is
3848 * so broken as to be worse than useless. The API draft
3849 * REALLY is NOT helpful here... I am not convinced that the
3850 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3851 * are at all well-founded.
3853 if (level
!= SOL_SCTP
) {
3854 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3855 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3862 case SCTP_SOCKOPT_BINDX_ADD
:
3863 /* 'optlen' is the size of the addresses buffer. */
3864 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3865 optlen
, SCTP_BINDX_ADD_ADDR
);
3868 case SCTP_SOCKOPT_BINDX_REM
:
3869 /* 'optlen' is the size of the addresses buffer. */
3870 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3871 optlen
, SCTP_BINDX_REM_ADDR
);
3874 case SCTP_SOCKOPT_CONNECTX_OLD
:
3875 /* 'optlen' is the size of the addresses buffer. */
3876 retval
= sctp_setsockopt_connectx_old(sk
,
3877 (struct sockaddr __user
*)optval
,
3881 case SCTP_SOCKOPT_CONNECTX
:
3882 /* 'optlen' is the size of the addresses buffer. */
3883 retval
= sctp_setsockopt_connectx(sk
,
3884 (struct sockaddr __user
*)optval
,
3888 case SCTP_DISABLE_FRAGMENTS
:
3889 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3893 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3896 case SCTP_AUTOCLOSE
:
3897 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3900 case SCTP_PEER_ADDR_PARAMS
:
3901 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3904 case SCTP_DELAYED_SACK
:
3905 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3907 case SCTP_PARTIAL_DELIVERY_POINT
:
3908 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3912 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
3914 case SCTP_DEFAULT_SEND_PARAM
:
3915 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
3918 case SCTP_DEFAULT_SNDINFO
:
3919 retval
= sctp_setsockopt_default_sndinfo(sk
, optval
, optlen
);
3921 case SCTP_PRIMARY_ADDR
:
3922 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
3924 case SCTP_SET_PEER_PRIMARY_ADDR
:
3925 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
3928 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
3931 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
3933 case SCTP_ASSOCINFO
:
3934 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
3936 case SCTP_I_WANT_MAPPED_V4_ADDR
:
3937 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
3940 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
3942 case SCTP_ADAPTATION_LAYER
:
3943 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
3946 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
3948 case SCTP_FRAGMENT_INTERLEAVE
:
3949 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
3951 case SCTP_MAX_BURST
:
3952 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
3954 case SCTP_AUTH_CHUNK
:
3955 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
3957 case SCTP_HMAC_IDENT
:
3958 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
3961 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
3963 case SCTP_AUTH_ACTIVE_KEY
:
3964 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
3966 case SCTP_AUTH_DELETE_KEY
:
3967 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
3969 case SCTP_AUTO_ASCONF
:
3970 retval
= sctp_setsockopt_auto_asconf(sk
, optval
, optlen
);
3972 case SCTP_PEER_ADDR_THLDS
:
3973 retval
= sctp_setsockopt_paddr_thresholds(sk
, optval
, optlen
);
3975 case SCTP_RECVRCVINFO
:
3976 retval
= sctp_setsockopt_recvrcvinfo(sk
, optval
, optlen
);
3978 case SCTP_RECVNXTINFO
:
3979 retval
= sctp_setsockopt_recvnxtinfo(sk
, optval
, optlen
);
3981 case SCTP_PR_SUPPORTED
:
3982 retval
= sctp_setsockopt_pr_supported(sk
, optval
, optlen
);
3984 case SCTP_DEFAULT_PRINFO
:
3985 retval
= sctp_setsockopt_default_prinfo(sk
, optval
, optlen
);
3987 case SCTP_ENABLE_STREAM_RESET
:
3988 retval
= sctp_setsockopt_enable_strreset(sk
, optval
, optlen
);
3990 case SCTP_RESET_STREAMS
:
3991 retval
= sctp_setsockopt_reset_streams(sk
, optval
, optlen
);
3994 retval
= -ENOPROTOOPT
;
4004 /* API 3.1.6 connect() - UDP Style Syntax
4006 * An application may use the connect() call in the UDP model to initiate an
4007 * association without sending data.
4011 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4013 * sd: the socket descriptor to have a new association added to.
4015 * nam: the address structure (either struct sockaddr_in or struct
4016 * sockaddr_in6 defined in RFC2553 [7]).
4018 * len: the size of the address.
4020 static int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
4028 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__
, sk
,
4031 /* Validate addr_len before calling common connect/connectx routine. */
4032 af
= sctp_get_af_specific(addr
->sa_family
);
4033 if (!af
|| addr_len
< af
->sockaddr_len
) {
4036 /* Pass correct addr len to common routine (so it knows there
4037 * is only one address being passed.
4039 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
4046 /* FIXME: Write comments. */
4047 static int sctp_disconnect(struct sock
*sk
, int flags
)
4049 return -EOPNOTSUPP
; /* STUB */
4052 /* 4.1.4 accept() - TCP Style Syntax
4054 * Applications use accept() call to remove an established SCTP
4055 * association from the accept queue of the endpoint. A new socket
4056 * descriptor will be returned from accept() to represent the newly
4057 * formed association.
4059 static struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
)
4061 struct sctp_sock
*sp
;
4062 struct sctp_endpoint
*ep
;
4063 struct sock
*newsk
= NULL
;
4064 struct sctp_association
*asoc
;
4073 if (!sctp_style(sk
, TCP
)) {
4074 error
= -EOPNOTSUPP
;
4078 if (!sctp_sstate(sk
, LISTENING
)) {
4083 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
4085 error
= sctp_wait_for_accept(sk
, timeo
);
4089 /* We treat the list of associations on the endpoint as the accept
4090 * queue and pick the first association on the list.
4092 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
4094 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
);
4100 /* Populate the fields of the newsk from the oldsk and migrate the
4101 * asoc to the newsk.
4103 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
4111 /* The SCTP ioctl handler. */
4112 static int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
4119 * SEQPACKET-style sockets in LISTENING state are valid, for
4120 * SCTP, so only discard TCP-style sockets in LISTENING state.
4122 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
4127 struct sk_buff
*skb
;
4128 unsigned int amount
= 0;
4130 skb
= skb_peek(&sk
->sk_receive_queue
);
4133 * We will only return the amount of this packet since
4134 * that is all that will be read.
4138 rc
= put_user(amount
, (int __user
*)arg
);
4150 /* This is the function which gets called during socket creation to
4151 * initialized the SCTP-specific portion of the sock.
4152 * The sock structure should already be zero-filled memory.
4154 static int sctp_init_sock(struct sock
*sk
)
4156 struct net
*net
= sock_net(sk
);
4157 struct sctp_sock
*sp
;
4159 pr_debug("%s: sk:%p\n", __func__
, sk
);
4163 /* Initialize the SCTP per socket area. */
4164 switch (sk
->sk_type
) {
4165 case SOCK_SEQPACKET
:
4166 sp
->type
= SCTP_SOCKET_UDP
;
4169 sp
->type
= SCTP_SOCKET_TCP
;
4172 return -ESOCKTNOSUPPORT
;
4175 sk
->sk_gso_type
= SKB_GSO_SCTP
;
4177 /* Initialize default send parameters. These parameters can be
4178 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4180 sp
->default_stream
= 0;
4181 sp
->default_ppid
= 0;
4182 sp
->default_flags
= 0;
4183 sp
->default_context
= 0;
4184 sp
->default_timetolive
= 0;
4186 sp
->default_rcv_context
= 0;
4187 sp
->max_burst
= net
->sctp
.max_burst
;
4189 sp
->sctp_hmac_alg
= net
->sctp
.sctp_hmac_alg
;
4191 /* Initialize default setup parameters. These parameters
4192 * can be modified with the SCTP_INITMSG socket option or
4193 * overridden by the SCTP_INIT CMSG.
4195 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
4196 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
4197 sp
->initmsg
.sinit_max_attempts
= net
->sctp
.max_retrans_init
;
4198 sp
->initmsg
.sinit_max_init_timeo
= net
->sctp
.rto_max
;
4200 /* Initialize default RTO related parameters. These parameters can
4201 * be modified for with the SCTP_RTOINFO socket option.
4203 sp
->rtoinfo
.srto_initial
= net
->sctp
.rto_initial
;
4204 sp
->rtoinfo
.srto_max
= net
->sctp
.rto_max
;
4205 sp
->rtoinfo
.srto_min
= net
->sctp
.rto_min
;
4207 /* Initialize default association related parameters. These parameters
4208 * can be modified with the SCTP_ASSOCINFO socket option.
4210 sp
->assocparams
.sasoc_asocmaxrxt
= net
->sctp
.max_retrans_association
;
4211 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
4212 sp
->assocparams
.sasoc_peer_rwnd
= 0;
4213 sp
->assocparams
.sasoc_local_rwnd
= 0;
4214 sp
->assocparams
.sasoc_cookie_life
= net
->sctp
.valid_cookie_life
;
4216 /* Initialize default event subscriptions. By default, all the
4219 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
4221 /* Default Peer Address Parameters. These defaults can
4222 * be modified via SCTP_PEER_ADDR_PARAMS
4224 sp
->hbinterval
= net
->sctp
.hb_interval
;
4225 sp
->pathmaxrxt
= net
->sctp
.max_retrans_path
;
4226 sp
->pathmtu
= 0; /* allow default discovery */
4227 sp
->sackdelay
= net
->sctp
.sack_timeout
;
4229 sp
->param_flags
= SPP_HB_ENABLE
|
4231 SPP_SACKDELAY_ENABLE
;
4233 /* If enabled no SCTP message fragmentation will be performed.
4234 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4236 sp
->disable_fragments
= 0;
4238 /* Enable Nagle algorithm by default. */
4241 sp
->recvrcvinfo
= 0;
4242 sp
->recvnxtinfo
= 0;
4244 /* Enable by default. */
4247 /* Auto-close idle associations after the configured
4248 * number of seconds. A value of 0 disables this
4249 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4250 * for UDP-style sockets only.
4254 /* User specified fragmentation limit. */
4257 sp
->adaptation_ind
= 0;
4259 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
4261 /* Control variables for partial data delivery. */
4262 atomic_set(&sp
->pd_mode
, 0);
4263 skb_queue_head_init(&sp
->pd_lobby
);
4264 sp
->frag_interleave
= 0;
4266 /* Create a per socket endpoint structure. Even if we
4267 * change the data structure relationships, this may still
4268 * be useful for storing pre-connect address information.
4270 sp
->ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
4276 sk
->sk_destruct
= sctp_destruct_sock
;
4278 SCTP_DBG_OBJCNT_INC(sock
);
4281 percpu_counter_inc(&sctp_sockets_allocated
);
4282 sock_prot_inuse_add(net
, sk
->sk_prot
, 1);
4284 /* Nothing can fail after this block, otherwise
4285 * sctp_destroy_sock() will be called without addr_wq_lock held
4287 if (net
->sctp
.default_auto_asconf
) {
4288 spin_lock(&sock_net(sk
)->sctp
.addr_wq_lock
);
4289 list_add_tail(&sp
->auto_asconf_list
,
4290 &net
->sctp
.auto_asconf_splist
);
4291 sp
->do_auto_asconf
= 1;
4292 spin_unlock(&sock_net(sk
)->sctp
.addr_wq_lock
);
4294 sp
->do_auto_asconf
= 0;
4302 /* Cleanup any SCTP per socket resources. Must be called with
4303 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4305 static void sctp_destroy_sock(struct sock
*sk
)
4307 struct sctp_sock
*sp
;
4309 pr_debug("%s: sk:%p\n", __func__
, sk
);
4311 /* Release our hold on the endpoint. */
4313 /* This could happen during socket init, thus we bail out
4314 * early, since the rest of the below is not setup either.
4319 if (sp
->do_auto_asconf
) {
4320 sp
->do_auto_asconf
= 0;
4321 list_del(&sp
->auto_asconf_list
);
4323 sctp_endpoint_free(sp
->ep
);
4325 percpu_counter_dec(&sctp_sockets_allocated
);
4326 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
4330 /* Triggered when there are no references on the socket anymore */
4331 static void sctp_destruct_sock(struct sock
*sk
)
4333 struct sctp_sock
*sp
= sctp_sk(sk
);
4335 /* Free up the HMAC transform. */
4336 crypto_free_shash(sp
->hmac
);
4338 inet_sock_destruct(sk
);
4341 /* API 4.1.7 shutdown() - TCP Style Syntax
4342 * int shutdown(int socket, int how);
4344 * sd - the socket descriptor of the association to be closed.
4345 * how - Specifies the type of shutdown. The values are
4348 * Disables further receive operations. No SCTP
4349 * protocol action is taken.
4351 * Disables further send operations, and initiates
4352 * the SCTP shutdown sequence.
4354 * Disables further send and receive operations
4355 * and initiates the SCTP shutdown sequence.
4357 static void sctp_shutdown(struct sock
*sk
, int how
)
4359 struct net
*net
= sock_net(sk
);
4360 struct sctp_endpoint
*ep
;
4362 if (!sctp_style(sk
, TCP
))
4365 ep
= sctp_sk(sk
)->ep
;
4366 if (how
& SEND_SHUTDOWN
&& !list_empty(&ep
->asocs
)) {
4367 struct sctp_association
*asoc
;
4369 sk
->sk_state
= SCTP_SS_CLOSING
;
4370 asoc
= list_entry(ep
->asocs
.next
,
4371 struct sctp_association
, asocs
);
4372 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
4376 int sctp_get_sctp_info(struct sock
*sk
, struct sctp_association
*asoc
,
4377 struct sctp_info
*info
)
4379 struct sctp_transport
*prim
;
4380 struct list_head
*pos
;
4383 memset(info
, 0, sizeof(*info
));
4385 struct sctp_sock
*sp
= sctp_sk(sk
);
4387 info
->sctpi_s_autoclose
= sp
->autoclose
;
4388 info
->sctpi_s_adaptation_ind
= sp
->adaptation_ind
;
4389 info
->sctpi_s_pd_point
= sp
->pd_point
;
4390 info
->sctpi_s_nodelay
= sp
->nodelay
;
4391 info
->sctpi_s_disable_fragments
= sp
->disable_fragments
;
4392 info
->sctpi_s_v4mapped
= sp
->v4mapped
;
4393 info
->sctpi_s_frag_interleave
= sp
->frag_interleave
;
4394 info
->sctpi_s_type
= sp
->type
;
4399 info
->sctpi_tag
= asoc
->c
.my_vtag
;
4400 info
->sctpi_state
= asoc
->state
;
4401 info
->sctpi_rwnd
= asoc
->a_rwnd
;
4402 info
->sctpi_unackdata
= asoc
->unack_data
;
4403 info
->sctpi_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4404 info
->sctpi_instrms
= asoc
->c
.sinit_max_instreams
;
4405 info
->sctpi_outstrms
= asoc
->c
.sinit_num_ostreams
;
4406 list_for_each(pos
, &asoc
->base
.inqueue
.in_chunk_list
)
4407 info
->sctpi_inqueue
++;
4408 list_for_each(pos
, &asoc
->outqueue
.out_chunk_list
)
4409 info
->sctpi_outqueue
++;
4410 info
->sctpi_overall_error
= asoc
->overall_error_count
;
4411 info
->sctpi_max_burst
= asoc
->max_burst
;
4412 info
->sctpi_maxseg
= asoc
->frag_point
;
4413 info
->sctpi_peer_rwnd
= asoc
->peer
.rwnd
;
4414 info
->sctpi_peer_tag
= asoc
->c
.peer_vtag
;
4416 mask
= asoc
->peer
.ecn_capable
<< 1;
4417 mask
= (mask
| asoc
->peer
.ipv4_address
) << 1;
4418 mask
= (mask
| asoc
->peer
.ipv6_address
) << 1;
4419 mask
= (mask
| asoc
->peer
.hostname_address
) << 1;
4420 mask
= (mask
| asoc
->peer
.asconf_capable
) << 1;
4421 mask
= (mask
| asoc
->peer
.prsctp_capable
) << 1;
4422 mask
= (mask
| asoc
->peer
.auth_capable
);
4423 info
->sctpi_peer_capable
= mask
;
4424 mask
= asoc
->peer
.sack_needed
<< 1;
4425 mask
= (mask
| asoc
->peer
.sack_generation
) << 1;
4426 mask
= (mask
| asoc
->peer
.zero_window_announced
);
4427 info
->sctpi_peer_sack
= mask
;
4429 info
->sctpi_isacks
= asoc
->stats
.isacks
;
4430 info
->sctpi_osacks
= asoc
->stats
.osacks
;
4431 info
->sctpi_opackets
= asoc
->stats
.opackets
;
4432 info
->sctpi_ipackets
= asoc
->stats
.ipackets
;
4433 info
->sctpi_rtxchunks
= asoc
->stats
.rtxchunks
;
4434 info
->sctpi_outofseqtsns
= asoc
->stats
.outofseqtsns
;
4435 info
->sctpi_idupchunks
= asoc
->stats
.idupchunks
;
4436 info
->sctpi_gapcnt
= asoc
->stats
.gapcnt
;
4437 info
->sctpi_ouodchunks
= asoc
->stats
.ouodchunks
;
4438 info
->sctpi_iuodchunks
= asoc
->stats
.iuodchunks
;
4439 info
->sctpi_oodchunks
= asoc
->stats
.oodchunks
;
4440 info
->sctpi_iodchunks
= asoc
->stats
.iodchunks
;
4441 info
->sctpi_octrlchunks
= asoc
->stats
.octrlchunks
;
4442 info
->sctpi_ictrlchunks
= asoc
->stats
.ictrlchunks
;
4444 prim
= asoc
->peer
.primary_path
;
4445 memcpy(&info
->sctpi_p_address
, &prim
->ipaddr
,
4446 sizeof(struct sockaddr_storage
));
4447 info
->sctpi_p_state
= prim
->state
;
4448 info
->sctpi_p_cwnd
= prim
->cwnd
;
4449 info
->sctpi_p_srtt
= prim
->srtt
;
4450 info
->sctpi_p_rto
= jiffies_to_msecs(prim
->rto
);
4451 info
->sctpi_p_hbinterval
= prim
->hbinterval
;
4452 info
->sctpi_p_pathmaxrxt
= prim
->pathmaxrxt
;
4453 info
->sctpi_p_sackdelay
= jiffies_to_msecs(prim
->sackdelay
);
4454 info
->sctpi_p_ssthresh
= prim
->ssthresh
;
4455 info
->sctpi_p_partial_bytes_acked
= prim
->partial_bytes_acked
;
4456 info
->sctpi_p_flight_size
= prim
->flight_size
;
4457 info
->sctpi_p_error
= prim
->error_count
;
4461 EXPORT_SYMBOL_GPL(sctp_get_sctp_info
);
4463 /* use callback to avoid exporting the core structure */
4464 int sctp_transport_walk_start(struct rhashtable_iter
*iter
)
4468 rhltable_walk_enter(&sctp_transport_hashtable
, iter
);
4470 err
= rhashtable_walk_start(iter
);
4471 if (err
&& err
!= -EAGAIN
) {
4472 rhashtable_walk_stop(iter
);
4473 rhashtable_walk_exit(iter
);
4480 void sctp_transport_walk_stop(struct rhashtable_iter
*iter
)
4482 rhashtable_walk_stop(iter
);
4483 rhashtable_walk_exit(iter
);
4486 struct sctp_transport
*sctp_transport_get_next(struct net
*net
,
4487 struct rhashtable_iter
*iter
)
4489 struct sctp_transport
*t
;
4491 t
= rhashtable_walk_next(iter
);
4492 for (; t
; t
= rhashtable_walk_next(iter
)) {
4494 if (PTR_ERR(t
) == -EAGAIN
)
4499 if (net_eq(sock_net(t
->asoc
->base
.sk
), net
) &&
4500 t
->asoc
->peer
.primary_path
== t
)
4507 struct sctp_transport
*sctp_transport_get_idx(struct net
*net
,
4508 struct rhashtable_iter
*iter
,
4511 void *obj
= SEQ_START_TOKEN
;
4513 while (pos
&& (obj
= sctp_transport_get_next(net
, iter
)) &&
4520 int sctp_for_each_endpoint(int (*cb
)(struct sctp_endpoint
*, void *),
4524 struct sctp_ep_common
*epb
;
4525 struct sctp_hashbucket
*head
;
4527 for (head
= sctp_ep_hashtable
; hash
< sctp_ep_hashsize
;
4529 read_lock(&head
->lock
);
4530 sctp_for_each_hentry(epb
, &head
->chain
) {
4531 err
= cb(sctp_ep(epb
), p
);
4535 read_unlock(&head
->lock
);
4540 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint
);
4542 int sctp_transport_lookup_process(int (*cb
)(struct sctp_transport
*, void *),
4544 const union sctp_addr
*laddr
,
4545 const union sctp_addr
*paddr
, void *p
)
4547 struct sctp_transport
*transport
;
4551 transport
= sctp_addrs_lookup_transport(net
, laddr
, paddr
);
4556 err
= cb(transport
, p
);
4557 sctp_transport_put(transport
);
4561 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process
);
4563 int sctp_for_each_transport(int (*cb
)(struct sctp_transport
*, void *),
4564 struct net
*net
, int pos
, void *p
) {
4565 struct rhashtable_iter hti
;
4569 err
= sctp_transport_walk_start(&hti
);
4573 sctp_transport_get_idx(net
, &hti
, pos
);
4574 obj
= sctp_transport_get_next(net
, &hti
);
4575 for (; obj
&& !IS_ERR(obj
); obj
= sctp_transport_get_next(net
, &hti
)) {
4576 struct sctp_transport
*transport
= obj
;
4578 if (!sctp_transport_hold(transport
))
4580 err
= cb(transport
, p
);
4581 sctp_transport_put(transport
);
4585 sctp_transport_walk_stop(&hti
);
4589 EXPORT_SYMBOL_GPL(sctp_for_each_transport
);
4591 /* 7.2.1 Association Status (SCTP_STATUS)
4593 * Applications can retrieve current status information about an
4594 * association, including association state, peer receiver window size,
4595 * number of unacked data chunks, and number of data chunks pending
4596 * receipt. This information is read-only.
4598 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
4599 char __user
*optval
,
4602 struct sctp_status status
;
4603 struct sctp_association
*asoc
= NULL
;
4604 struct sctp_transport
*transport
;
4605 sctp_assoc_t associd
;
4608 if (len
< sizeof(status
)) {
4613 len
= sizeof(status
);
4614 if (copy_from_user(&status
, optval
, len
)) {
4619 associd
= status
.sstat_assoc_id
;
4620 asoc
= sctp_id2assoc(sk
, associd
);
4626 transport
= asoc
->peer
.primary_path
;
4628 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
4629 status
.sstat_state
= sctp_assoc_to_state(asoc
);
4630 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
4631 status
.sstat_unackdata
= asoc
->unack_data
;
4633 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4634 status
.sstat_instrms
= asoc
->c
.sinit_max_instreams
;
4635 status
.sstat_outstrms
= asoc
->c
.sinit_num_ostreams
;
4636 status
.sstat_fragmentation_point
= asoc
->frag_point
;
4637 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4638 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
4639 transport
->af_specific
->sockaddr_len
);
4640 /* Map ipv4 address into v4-mapped-on-v6 address. */
4641 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sctp_sk(sk
),
4642 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
4643 status
.sstat_primary
.spinfo_state
= transport
->state
;
4644 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
4645 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
4646 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4647 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
4649 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
4650 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
4652 if (put_user(len
, optlen
)) {
4657 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4658 __func__
, len
, status
.sstat_state
, status
.sstat_rwnd
,
4659 status
.sstat_assoc_id
);
4661 if (copy_to_user(optval
, &status
, len
)) {
4671 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4673 * Applications can retrieve information about a specific peer address
4674 * of an association, including its reachability state, congestion
4675 * window, and retransmission timer values. This information is
4678 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
4679 char __user
*optval
,
4682 struct sctp_paddrinfo pinfo
;
4683 struct sctp_transport
*transport
;
4686 if (len
< sizeof(pinfo
)) {
4691 len
= sizeof(pinfo
);
4692 if (copy_from_user(&pinfo
, optval
, len
)) {
4697 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
4698 pinfo
.spinfo_assoc_id
);
4702 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4703 pinfo
.spinfo_state
= transport
->state
;
4704 pinfo
.spinfo_cwnd
= transport
->cwnd
;
4705 pinfo
.spinfo_srtt
= transport
->srtt
;
4706 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4707 pinfo
.spinfo_mtu
= transport
->pathmtu
;
4709 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
4710 pinfo
.spinfo_state
= SCTP_ACTIVE
;
4712 if (put_user(len
, optlen
)) {
4717 if (copy_to_user(optval
, &pinfo
, len
)) {
4726 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4728 * This option is a on/off flag. If enabled no SCTP message
4729 * fragmentation will be performed. Instead if a message being sent
4730 * exceeds the current PMTU size, the message will NOT be sent and
4731 * instead a error will be indicated to the user.
4733 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
4734 char __user
*optval
, int __user
*optlen
)
4738 if (len
< sizeof(int))
4742 val
= (sctp_sk(sk
)->disable_fragments
== 1);
4743 if (put_user(len
, optlen
))
4745 if (copy_to_user(optval
, &val
, len
))
4750 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4752 * This socket option is used to specify various notifications and
4753 * ancillary data the user wishes to receive.
4755 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
4760 if (len
> sizeof(struct sctp_event_subscribe
))
4761 len
= sizeof(struct sctp_event_subscribe
);
4762 if (put_user(len
, optlen
))
4764 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
4769 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4771 * This socket option is applicable to the UDP-style socket only. When
4772 * set it will cause associations that are idle for more than the
4773 * specified number of seconds to automatically close. An association
4774 * being idle is defined an association that has NOT sent or received
4775 * user data. The special value of '0' indicates that no automatic
4776 * close of any associations should be performed. The option expects an
4777 * integer defining the number of seconds of idle time before an
4778 * association is closed.
4780 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4782 /* Applicable to UDP-style socket only */
4783 if (sctp_style(sk
, TCP
))
4785 if (len
< sizeof(int))
4788 if (put_user(len
, optlen
))
4790 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
4795 /* Helper routine to branch off an association to a new socket. */
4796 int sctp_do_peeloff(struct sock
*sk
, sctp_assoc_t id
, struct socket
**sockp
)
4798 struct sctp_association
*asoc
= sctp_id2assoc(sk
, id
);
4799 struct sctp_sock
*sp
= sctp_sk(sk
);
4800 struct socket
*sock
;
4806 /* An association cannot be branched off from an already peeled-off
4807 * socket, nor is this supported for tcp style sockets.
4809 if (!sctp_style(sk
, UDP
))
4812 /* Create a new socket. */
4813 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
4817 sctp_copy_sock(sock
->sk
, sk
, asoc
);
4819 /* Make peeled-off sockets more like 1-1 accepted sockets.
4820 * Set the daddr and initialize id to something more random
4822 sp
->pf
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
4824 /* Populate the fields of the newsk from the oldsk and migrate the
4825 * asoc to the newsk.
4827 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
4833 EXPORT_SYMBOL(sctp_do_peeloff
);
4835 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4837 sctp_peeloff_arg_t peeloff
;
4838 struct socket
*newsock
;
4839 struct file
*newfile
;
4842 if (len
< sizeof(sctp_peeloff_arg_t
))
4844 len
= sizeof(sctp_peeloff_arg_t
);
4845 if (copy_from_user(&peeloff
, optval
, len
))
4848 retval
= sctp_do_peeloff(sk
, peeloff
.associd
, &newsock
);
4852 /* Map the socket to an unused fd that can be returned to the user. */
4853 retval
= get_unused_fd_flags(0);
4855 sock_release(newsock
);
4859 newfile
= sock_alloc_file(newsock
, 0, NULL
);
4860 if (IS_ERR(newfile
)) {
4861 put_unused_fd(retval
);
4862 sock_release(newsock
);
4863 return PTR_ERR(newfile
);
4866 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__
, sk
, newsock
->sk
,
4869 /* Return the fd mapped to the new socket. */
4870 if (put_user(len
, optlen
)) {
4872 put_unused_fd(retval
);
4875 peeloff
.sd
= retval
;
4876 if (copy_to_user(optval
, &peeloff
, len
)) {
4878 put_unused_fd(retval
);
4881 fd_install(retval
, newfile
);
4886 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4888 * Applications can enable or disable heartbeats for any peer address of
4889 * an association, modify an address's heartbeat interval, force a
4890 * heartbeat to be sent immediately, and adjust the address's maximum
4891 * number of retransmissions sent before an address is considered
4892 * unreachable. The following structure is used to access and modify an
4893 * address's parameters:
4895 * struct sctp_paddrparams {
4896 * sctp_assoc_t spp_assoc_id;
4897 * struct sockaddr_storage spp_address;
4898 * uint32_t spp_hbinterval;
4899 * uint16_t spp_pathmaxrxt;
4900 * uint32_t spp_pathmtu;
4901 * uint32_t spp_sackdelay;
4902 * uint32_t spp_flags;
4905 * spp_assoc_id - (one-to-many style socket) This is filled in the
4906 * application, and identifies the association for
4908 * spp_address - This specifies which address is of interest.
4909 * spp_hbinterval - This contains the value of the heartbeat interval,
4910 * in milliseconds. If a value of zero
4911 * is present in this field then no changes are to
4912 * be made to this parameter.
4913 * spp_pathmaxrxt - This contains the maximum number of
4914 * retransmissions before this address shall be
4915 * considered unreachable. If a value of zero
4916 * is present in this field then no changes are to
4917 * be made to this parameter.
4918 * spp_pathmtu - When Path MTU discovery is disabled the value
4919 * specified here will be the "fixed" path mtu.
4920 * Note that if the spp_address field is empty
4921 * then all associations on this address will
4922 * have this fixed path mtu set upon them.
4924 * spp_sackdelay - When delayed sack is enabled, this value specifies
4925 * the number of milliseconds that sacks will be delayed
4926 * for. This value will apply to all addresses of an
4927 * association if the spp_address field is empty. Note
4928 * also, that if delayed sack is enabled and this
4929 * value is set to 0, no change is made to the last
4930 * recorded delayed sack timer value.
4932 * spp_flags - These flags are used to control various features
4933 * on an association. The flag field may contain
4934 * zero or more of the following options.
4936 * SPP_HB_ENABLE - Enable heartbeats on the
4937 * specified address. Note that if the address
4938 * field is empty all addresses for the association
4939 * have heartbeats enabled upon them.
4941 * SPP_HB_DISABLE - Disable heartbeats on the
4942 * speicifed address. Note that if the address
4943 * field is empty all addresses for the association
4944 * will have their heartbeats disabled. Note also
4945 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4946 * mutually exclusive, only one of these two should
4947 * be specified. Enabling both fields will have
4948 * undetermined results.
4950 * SPP_HB_DEMAND - Request a user initiated heartbeat
4951 * to be made immediately.
4953 * SPP_PMTUD_ENABLE - This field will enable PMTU
4954 * discovery upon the specified address. Note that
4955 * if the address feild is empty then all addresses
4956 * on the association are effected.
4958 * SPP_PMTUD_DISABLE - This field will disable PMTU
4959 * discovery upon the specified address. Note that
4960 * if the address feild is empty then all addresses
4961 * on the association are effected. Not also that
4962 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4963 * exclusive. Enabling both will have undetermined
4966 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4967 * on delayed sack. The time specified in spp_sackdelay
4968 * is used to specify the sack delay for this address. Note
4969 * that if spp_address is empty then all addresses will
4970 * enable delayed sack and take on the sack delay
4971 * value specified in spp_sackdelay.
4972 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4973 * off delayed sack. If the spp_address field is blank then
4974 * delayed sack is disabled for the entire association. Note
4975 * also that this field is mutually exclusive to
4976 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4979 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
4980 char __user
*optval
, int __user
*optlen
)
4982 struct sctp_paddrparams params
;
4983 struct sctp_transport
*trans
= NULL
;
4984 struct sctp_association
*asoc
= NULL
;
4985 struct sctp_sock
*sp
= sctp_sk(sk
);
4987 if (len
< sizeof(struct sctp_paddrparams
))
4989 len
= sizeof(struct sctp_paddrparams
);
4990 if (copy_from_user(¶ms
, optval
, len
))
4993 /* If an address other than INADDR_ANY is specified, and
4994 * no transport is found, then the request is invalid.
4996 if (!sctp_is_any(sk
, (union sctp_addr
*)¶ms
.spp_address
)) {
4997 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
4998 params
.spp_assoc_id
);
5000 pr_debug("%s: failed no transport\n", __func__
);
5005 /* Get association, if assoc_id != 0 and the socket is a one
5006 * to many style socket, and an association was not found, then
5007 * the id was invalid.
5009 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
5010 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
5011 pr_debug("%s: failed no association\n", __func__
);
5016 /* Fetch transport values. */
5017 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
5018 params
.spp_pathmtu
= trans
->pathmtu
;
5019 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
5020 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
5022 /*draft-11 doesn't say what to return in spp_flags*/
5023 params
.spp_flags
= trans
->param_flags
;
5025 /* Fetch association values. */
5026 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
5027 params
.spp_pathmtu
= asoc
->pathmtu
;
5028 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
5029 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
5031 /*draft-11 doesn't say what to return in spp_flags*/
5032 params
.spp_flags
= asoc
->param_flags
;
5034 /* Fetch socket values. */
5035 params
.spp_hbinterval
= sp
->hbinterval
;
5036 params
.spp_pathmtu
= sp
->pathmtu
;
5037 params
.spp_sackdelay
= sp
->sackdelay
;
5038 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
5040 /*draft-11 doesn't say what to return in spp_flags*/
5041 params
.spp_flags
= sp
->param_flags
;
5044 if (copy_to_user(optval
, ¶ms
, len
))
5047 if (put_user(len
, optlen
))
5054 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5056 * This option will effect the way delayed acks are performed. This
5057 * option allows you to get or set the delayed ack time, in
5058 * milliseconds. It also allows changing the delayed ack frequency.
5059 * Changing the frequency to 1 disables the delayed sack algorithm. If
5060 * the assoc_id is 0, then this sets or gets the endpoints default
5061 * values. If the assoc_id field is non-zero, then the set or get
5062 * effects the specified association for the one to many model (the
5063 * assoc_id field is ignored by the one to one model). Note that if
5064 * sack_delay or sack_freq are 0 when setting this option, then the
5065 * current values will remain unchanged.
5067 * struct sctp_sack_info {
5068 * sctp_assoc_t sack_assoc_id;
5069 * uint32_t sack_delay;
5070 * uint32_t sack_freq;
5073 * sack_assoc_id - This parameter, indicates which association the user
5074 * is performing an action upon. Note that if this field's value is
5075 * zero then the endpoints default value is changed (effecting future
5076 * associations only).
5078 * sack_delay - This parameter contains the number of milliseconds that
5079 * the user is requesting the delayed ACK timer be set to. Note that
5080 * this value is defined in the standard to be between 200 and 500
5083 * sack_freq - This parameter contains the number of packets that must
5084 * be received before a sack is sent without waiting for the delay
5085 * timer to expire. The default value for this is 2, setting this
5086 * value to 1 will disable the delayed sack algorithm.
5088 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
5089 char __user
*optval
,
5092 struct sctp_sack_info params
;
5093 struct sctp_association
*asoc
= NULL
;
5094 struct sctp_sock
*sp
= sctp_sk(sk
);
5096 if (len
>= sizeof(struct sctp_sack_info
)) {
5097 len
= sizeof(struct sctp_sack_info
);
5099 if (copy_from_user(¶ms
, optval
, len
))
5101 } else if (len
== sizeof(struct sctp_assoc_value
)) {
5102 pr_warn_ratelimited(DEPRECATED
5104 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5105 "Use struct sctp_sack_info instead\n",
5106 current
->comm
, task_pid_nr(current
));
5107 if (copy_from_user(¶ms
, optval
, len
))
5112 /* Get association, if sack_assoc_id != 0 and the socket is a one
5113 * to many style socket, and an association was not found, then
5114 * the id was invalid.
5116 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
5117 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
5121 /* Fetch association values. */
5122 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
5123 params
.sack_delay
= jiffies_to_msecs(
5125 params
.sack_freq
= asoc
->sackfreq
;
5128 params
.sack_delay
= 0;
5129 params
.sack_freq
= 1;
5132 /* Fetch socket values. */
5133 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
5134 params
.sack_delay
= sp
->sackdelay
;
5135 params
.sack_freq
= sp
->sackfreq
;
5137 params
.sack_delay
= 0;
5138 params
.sack_freq
= 1;
5142 if (copy_to_user(optval
, ¶ms
, len
))
5145 if (put_user(len
, optlen
))
5151 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5153 * Applications can specify protocol parameters for the default association
5154 * initialization. The option name argument to setsockopt() and getsockopt()
5157 * Setting initialization parameters is effective only on an unconnected
5158 * socket (for UDP-style sockets only future associations are effected
5159 * by the change). With TCP-style sockets, this option is inherited by
5160 * sockets derived from a listener socket.
5162 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
5164 if (len
< sizeof(struct sctp_initmsg
))
5166 len
= sizeof(struct sctp_initmsg
);
5167 if (put_user(len
, optlen
))
5169 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
5175 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
5176 char __user
*optval
, int __user
*optlen
)
5178 struct sctp_association
*asoc
;
5180 struct sctp_getaddrs getaddrs
;
5181 struct sctp_transport
*from
;
5183 union sctp_addr temp
;
5184 struct sctp_sock
*sp
= sctp_sk(sk
);
5189 if (len
< sizeof(struct sctp_getaddrs
))
5192 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
5195 /* For UDP-style sockets, id specifies the association to query. */
5196 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
5200 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
5201 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
5203 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
5205 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
5206 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5207 ->addr_to_user(sp
, &temp
);
5208 if (space_left
< addrlen
)
5210 if (copy_to_user(to
, &temp
, addrlen
))
5214 space_left
-= addrlen
;
5217 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
5219 bytes_copied
= ((char __user
*)to
) - optval
;
5220 if (put_user(bytes_copied
, optlen
))
5226 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
5227 size_t space_left
, int *bytes_copied
)
5229 struct sctp_sockaddr_entry
*addr
;
5230 union sctp_addr temp
;
5233 struct net
*net
= sock_net(sk
);
5236 list_for_each_entry_rcu(addr
, &net
->sctp
.local_addr_list
, list
) {
5240 if ((PF_INET
== sk
->sk_family
) &&
5241 (AF_INET6
== addr
->a
.sa
.sa_family
))
5243 if ((PF_INET6
== sk
->sk_family
) &&
5244 inet_v6_ipv6only(sk
) &&
5245 (AF_INET
== addr
->a
.sa
.sa_family
))
5247 memcpy(&temp
, &addr
->a
, sizeof(temp
));
5248 if (!temp
.v4
.sin_port
)
5249 temp
.v4
.sin_port
= htons(port
);
5251 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5252 ->addr_to_user(sctp_sk(sk
), &temp
);
5254 if (space_left
< addrlen
) {
5258 memcpy(to
, &temp
, addrlen
);
5262 space_left
-= addrlen
;
5263 *bytes_copied
+= addrlen
;
5271 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
5272 char __user
*optval
, int __user
*optlen
)
5274 struct sctp_bind_addr
*bp
;
5275 struct sctp_association
*asoc
;
5277 struct sctp_getaddrs getaddrs
;
5278 struct sctp_sockaddr_entry
*addr
;
5280 union sctp_addr temp
;
5281 struct sctp_sock
*sp
= sctp_sk(sk
);
5285 int bytes_copied
= 0;
5289 if (len
< sizeof(struct sctp_getaddrs
))
5292 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
5296 * For UDP-style sockets, id specifies the association to query.
5297 * If the id field is set to the value '0' then the locally bound
5298 * addresses are returned without regard to any particular
5301 if (0 == getaddrs
.assoc_id
) {
5302 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
5304 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
5307 bp
= &asoc
->base
.bind_addr
;
5310 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
5311 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
5313 addrs
= kmalloc(space_left
, GFP_USER
| __GFP_NOWARN
);
5317 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5318 * addresses from the global local address list.
5320 if (sctp_list_single_entry(&bp
->address_list
)) {
5321 addr
= list_entry(bp
->address_list
.next
,
5322 struct sctp_sockaddr_entry
, list
);
5323 if (sctp_is_any(sk
, &addr
->a
)) {
5324 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
5325 space_left
, &bytes_copied
);
5335 /* Protection on the bound address list is not needed since
5336 * in the socket option context we hold a socket lock and
5337 * thus the bound address list can't change.
5339 list_for_each_entry(addr
, &bp
->address_list
, list
) {
5340 memcpy(&temp
, &addr
->a
, sizeof(temp
));
5341 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5342 ->addr_to_user(sp
, &temp
);
5343 if (space_left
< addrlen
) {
5344 err
= -ENOMEM
; /*fixme: right error?*/
5347 memcpy(buf
, &temp
, addrlen
);
5349 bytes_copied
+= addrlen
;
5351 space_left
-= addrlen
;
5355 if (copy_to_user(to
, addrs
, bytes_copied
)) {
5359 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
5363 if (put_user(bytes_copied
, optlen
))
5370 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5372 * Requests that the local SCTP stack use the enclosed peer address as
5373 * the association primary. The enclosed address must be one of the
5374 * association peer's addresses.
5376 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
5377 char __user
*optval
, int __user
*optlen
)
5379 struct sctp_prim prim
;
5380 struct sctp_association
*asoc
;
5381 struct sctp_sock
*sp
= sctp_sk(sk
);
5383 if (len
< sizeof(struct sctp_prim
))
5386 len
= sizeof(struct sctp_prim
);
5388 if (copy_from_user(&prim
, optval
, len
))
5391 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
5395 if (!asoc
->peer
.primary_path
)
5398 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
5399 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
5401 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sp
,
5402 (union sctp_addr
*)&prim
.ssp_addr
);
5404 if (put_user(len
, optlen
))
5406 if (copy_to_user(optval
, &prim
, len
))
5413 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5415 * Requests that the local endpoint set the specified Adaptation Layer
5416 * Indication parameter for all future INIT and INIT-ACK exchanges.
5418 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
5419 char __user
*optval
, int __user
*optlen
)
5421 struct sctp_setadaptation adaptation
;
5423 if (len
< sizeof(struct sctp_setadaptation
))
5426 len
= sizeof(struct sctp_setadaptation
);
5428 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
5430 if (put_user(len
, optlen
))
5432 if (copy_to_user(optval
, &adaptation
, len
))
5440 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5442 * Applications that wish to use the sendto() system call may wish to
5443 * specify a default set of parameters that would normally be supplied
5444 * through the inclusion of ancillary data. This socket option allows
5445 * such an application to set the default sctp_sndrcvinfo structure.
5448 * The application that wishes to use this socket option simply passes
5449 * in to this call the sctp_sndrcvinfo structure defined in Section
5450 * 5.2.2) The input parameters accepted by this call include
5451 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5452 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5453 * to this call if the caller is using the UDP model.
5455 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5457 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
5458 int len
, char __user
*optval
,
5461 struct sctp_sock
*sp
= sctp_sk(sk
);
5462 struct sctp_association
*asoc
;
5463 struct sctp_sndrcvinfo info
;
5465 if (len
< sizeof(info
))
5470 if (copy_from_user(&info
, optval
, len
))
5473 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
5474 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
5477 info
.sinfo_stream
= asoc
->default_stream
;
5478 info
.sinfo_flags
= asoc
->default_flags
;
5479 info
.sinfo_ppid
= asoc
->default_ppid
;
5480 info
.sinfo_context
= asoc
->default_context
;
5481 info
.sinfo_timetolive
= asoc
->default_timetolive
;
5483 info
.sinfo_stream
= sp
->default_stream
;
5484 info
.sinfo_flags
= sp
->default_flags
;
5485 info
.sinfo_ppid
= sp
->default_ppid
;
5486 info
.sinfo_context
= sp
->default_context
;
5487 info
.sinfo_timetolive
= sp
->default_timetolive
;
5490 if (put_user(len
, optlen
))
5492 if (copy_to_user(optval
, &info
, len
))
5498 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5499 * (SCTP_DEFAULT_SNDINFO)
5501 static int sctp_getsockopt_default_sndinfo(struct sock
*sk
, int len
,
5502 char __user
*optval
,
5505 struct sctp_sock
*sp
= sctp_sk(sk
);
5506 struct sctp_association
*asoc
;
5507 struct sctp_sndinfo info
;
5509 if (len
< sizeof(info
))
5514 if (copy_from_user(&info
, optval
, len
))
5517 asoc
= sctp_id2assoc(sk
, info
.snd_assoc_id
);
5518 if (!asoc
&& info
.snd_assoc_id
&& sctp_style(sk
, UDP
))
5521 info
.snd_sid
= asoc
->default_stream
;
5522 info
.snd_flags
= asoc
->default_flags
;
5523 info
.snd_ppid
= asoc
->default_ppid
;
5524 info
.snd_context
= asoc
->default_context
;
5526 info
.snd_sid
= sp
->default_stream
;
5527 info
.snd_flags
= sp
->default_flags
;
5528 info
.snd_ppid
= sp
->default_ppid
;
5529 info
.snd_context
= sp
->default_context
;
5532 if (put_user(len
, optlen
))
5534 if (copy_to_user(optval
, &info
, len
))
5542 * 7.1.5 SCTP_NODELAY
5544 * Turn on/off any Nagle-like algorithm. This means that packets are
5545 * generally sent as soon as possible and no unnecessary delays are
5546 * introduced, at the cost of more packets in the network. Expects an
5547 * integer boolean flag.
5550 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
5551 char __user
*optval
, int __user
*optlen
)
5555 if (len
< sizeof(int))
5559 val
= (sctp_sk(sk
)->nodelay
== 1);
5560 if (put_user(len
, optlen
))
5562 if (copy_to_user(optval
, &val
, len
))
5569 * 7.1.1 SCTP_RTOINFO
5571 * The protocol parameters used to initialize and bound retransmission
5572 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5573 * and modify these parameters.
5574 * All parameters are time values, in milliseconds. A value of 0, when
5575 * modifying the parameters, indicates that the current value should not
5579 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
5580 char __user
*optval
,
5581 int __user
*optlen
) {
5582 struct sctp_rtoinfo rtoinfo
;
5583 struct sctp_association
*asoc
;
5585 if (len
< sizeof (struct sctp_rtoinfo
))
5588 len
= sizeof(struct sctp_rtoinfo
);
5590 if (copy_from_user(&rtoinfo
, optval
, len
))
5593 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
5595 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
5598 /* Values corresponding to the specific association. */
5600 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
5601 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
5602 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
5604 /* Values corresponding to the endpoint. */
5605 struct sctp_sock
*sp
= sctp_sk(sk
);
5607 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
5608 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
5609 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
5612 if (put_user(len
, optlen
))
5615 if (copy_to_user(optval
, &rtoinfo
, len
))
5623 * 7.1.2 SCTP_ASSOCINFO
5625 * This option is used to tune the maximum retransmission attempts
5626 * of the association.
5627 * Returns an error if the new association retransmission value is
5628 * greater than the sum of the retransmission value of the peer.
5629 * See [SCTP] for more information.
5632 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
5633 char __user
*optval
,
5637 struct sctp_assocparams assocparams
;
5638 struct sctp_association
*asoc
;
5639 struct list_head
*pos
;
5642 if (len
< sizeof (struct sctp_assocparams
))
5645 len
= sizeof(struct sctp_assocparams
);
5647 if (copy_from_user(&assocparams
, optval
, len
))
5650 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
5652 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
5655 /* Values correspoinding to the specific association */
5657 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
5658 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
5659 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
5660 assocparams
.sasoc_cookie_life
= ktime_to_ms(asoc
->cookie_life
);
5662 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
5666 assocparams
.sasoc_number_peer_destinations
= cnt
;
5668 /* Values corresponding to the endpoint */
5669 struct sctp_sock
*sp
= sctp_sk(sk
);
5671 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
5672 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
5673 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
5674 assocparams
.sasoc_cookie_life
=
5675 sp
->assocparams
.sasoc_cookie_life
;
5676 assocparams
.sasoc_number_peer_destinations
=
5678 sasoc_number_peer_destinations
;
5681 if (put_user(len
, optlen
))
5684 if (copy_to_user(optval
, &assocparams
, len
))
5691 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5693 * This socket option is a boolean flag which turns on or off mapped V4
5694 * addresses. If this option is turned on and the socket is type
5695 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5696 * If this option is turned off, then no mapping will be done of V4
5697 * addresses and a user will receive both PF_INET6 and PF_INET type
5698 * addresses on the socket.
5700 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
5701 char __user
*optval
, int __user
*optlen
)
5704 struct sctp_sock
*sp
= sctp_sk(sk
);
5706 if (len
< sizeof(int))
5711 if (put_user(len
, optlen
))
5713 if (copy_to_user(optval
, &val
, len
))
5720 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5721 * (chapter and verse is quoted at sctp_setsockopt_context())
5723 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
5724 char __user
*optval
, int __user
*optlen
)
5726 struct sctp_assoc_value params
;
5727 struct sctp_sock
*sp
;
5728 struct sctp_association
*asoc
;
5730 if (len
< sizeof(struct sctp_assoc_value
))
5733 len
= sizeof(struct sctp_assoc_value
);
5735 if (copy_from_user(¶ms
, optval
, len
))
5740 if (params
.assoc_id
!= 0) {
5741 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5744 params
.assoc_value
= asoc
->default_rcv_context
;
5746 params
.assoc_value
= sp
->default_rcv_context
;
5749 if (put_user(len
, optlen
))
5751 if (copy_to_user(optval
, ¶ms
, len
))
5758 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5759 * This option will get or set the maximum size to put in any outgoing
5760 * SCTP DATA chunk. If a message is larger than this size it will be
5761 * fragmented by SCTP into the specified size. Note that the underlying
5762 * SCTP implementation may fragment into smaller sized chunks when the
5763 * PMTU of the underlying association is smaller than the value set by
5764 * the user. The default value for this option is '0' which indicates
5765 * the user is NOT limiting fragmentation and only the PMTU will effect
5766 * SCTP's choice of DATA chunk size. Note also that values set larger
5767 * than the maximum size of an IP datagram will effectively let SCTP
5768 * control fragmentation (i.e. the same as setting this option to 0).
5770 * The following structure is used to access and modify this parameter:
5772 * struct sctp_assoc_value {
5773 * sctp_assoc_t assoc_id;
5774 * uint32_t assoc_value;
5777 * assoc_id: This parameter is ignored for one-to-one style sockets.
5778 * For one-to-many style sockets this parameter indicates which
5779 * association the user is performing an action upon. Note that if
5780 * this field's value is zero then the endpoints default value is
5781 * changed (effecting future associations only).
5782 * assoc_value: This parameter specifies the maximum size in bytes.
5784 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
5785 char __user
*optval
, int __user
*optlen
)
5787 struct sctp_assoc_value params
;
5788 struct sctp_association
*asoc
;
5790 if (len
== sizeof(int)) {
5791 pr_warn_ratelimited(DEPRECATED
5793 "Use of int in maxseg socket option.\n"
5794 "Use struct sctp_assoc_value instead\n",
5795 current
->comm
, task_pid_nr(current
));
5796 params
.assoc_id
= 0;
5797 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5798 len
= sizeof(struct sctp_assoc_value
);
5799 if (copy_from_user(¶ms
, optval
, sizeof(params
)))
5804 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5805 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
5809 params
.assoc_value
= asoc
->frag_point
;
5811 params
.assoc_value
= sctp_sk(sk
)->user_frag
;
5813 if (put_user(len
, optlen
))
5815 if (len
== sizeof(int)) {
5816 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5819 if (copy_to_user(optval
, ¶ms
, len
))
5827 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5828 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5830 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
5831 char __user
*optval
, int __user
*optlen
)
5835 if (len
< sizeof(int))
5840 val
= sctp_sk(sk
)->frag_interleave
;
5841 if (put_user(len
, optlen
))
5843 if (copy_to_user(optval
, &val
, len
))
5850 * 7.1.25. Set or Get the sctp partial delivery point
5851 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5853 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
5854 char __user
*optval
,
5859 if (len
< sizeof(u32
))
5864 val
= sctp_sk(sk
)->pd_point
;
5865 if (put_user(len
, optlen
))
5867 if (copy_to_user(optval
, &val
, len
))
5874 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5875 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5877 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5878 char __user
*optval
,
5881 struct sctp_assoc_value params
;
5882 struct sctp_sock
*sp
;
5883 struct sctp_association
*asoc
;
5885 if (len
== sizeof(int)) {
5886 pr_warn_ratelimited(DEPRECATED
5888 "Use of int in max_burst socket option.\n"
5889 "Use struct sctp_assoc_value instead\n",
5890 current
->comm
, task_pid_nr(current
));
5891 params
.assoc_id
= 0;
5892 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5893 len
= sizeof(struct sctp_assoc_value
);
5894 if (copy_from_user(¶ms
, optval
, len
))
5901 if (params
.assoc_id
!= 0) {
5902 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5905 params
.assoc_value
= asoc
->max_burst
;
5907 params
.assoc_value
= sp
->max_burst
;
5909 if (len
== sizeof(int)) {
5910 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5913 if (copy_to_user(optval
, ¶ms
, len
))
5921 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
5922 char __user
*optval
, int __user
*optlen
)
5924 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
5925 struct sctp_hmacalgo __user
*p
= (void __user
*)optval
;
5926 struct sctp_hmac_algo_param
*hmacs
;
5931 if (!ep
->auth_enable
)
5934 hmacs
= ep
->auth_hmacs_list
;
5935 data_len
= ntohs(hmacs
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
5937 if (len
< sizeof(struct sctp_hmacalgo
) + data_len
)
5940 len
= sizeof(struct sctp_hmacalgo
) + data_len
;
5941 num_idents
= data_len
/ sizeof(u16
);
5943 if (put_user(len
, optlen
))
5945 if (put_user(num_idents
, &p
->shmac_num_idents
))
5947 for (i
= 0; i
< num_idents
; i
++) {
5948 __u16 hmacid
= ntohs(hmacs
->hmac_ids
[i
]);
5950 if (copy_to_user(&p
->shmac_idents
[i
], &hmacid
, sizeof(__u16
)))
5956 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
5957 char __user
*optval
, int __user
*optlen
)
5959 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
5960 struct sctp_authkeyid val
;
5961 struct sctp_association
*asoc
;
5963 if (!ep
->auth_enable
)
5966 if (len
< sizeof(struct sctp_authkeyid
))
5968 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
5971 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
5972 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
5976 val
.scact_keynumber
= asoc
->active_key_id
;
5978 val
.scact_keynumber
= ep
->active_key_id
;
5980 len
= sizeof(struct sctp_authkeyid
);
5981 if (put_user(len
, optlen
))
5983 if (copy_to_user(optval
, &val
, len
))
5989 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
5990 char __user
*optval
, int __user
*optlen
)
5992 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
5993 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
5994 struct sctp_authchunks val
;
5995 struct sctp_association
*asoc
;
5996 struct sctp_chunks_param
*ch
;
6000 if (!ep
->auth_enable
)
6003 if (len
< sizeof(struct sctp_authchunks
))
6006 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
6009 to
= p
->gauth_chunks
;
6010 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
6014 ch
= asoc
->peer
.peer_chunks
;
6018 /* See if the user provided enough room for all the data */
6019 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
6020 if (len
< num_chunks
)
6023 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
6026 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
6027 if (put_user(len
, optlen
))
6029 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
6034 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
6035 char __user
*optval
, int __user
*optlen
)
6037 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6038 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
6039 struct sctp_authchunks val
;
6040 struct sctp_association
*asoc
;
6041 struct sctp_chunks_param
*ch
;
6045 if (!ep
->auth_enable
)
6048 if (len
< sizeof(struct sctp_authchunks
))
6051 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
6054 to
= p
->gauth_chunks
;
6055 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
6056 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
6060 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
6062 ch
= ep
->auth_chunk_list
;
6067 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
6068 if (len
< sizeof(struct sctp_authchunks
) + num_chunks
)
6071 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
6074 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
6075 if (put_user(len
, optlen
))
6077 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
6084 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6085 * This option gets the current number of associations that are attached
6086 * to a one-to-many style socket. The option value is an uint32_t.
6088 static int sctp_getsockopt_assoc_number(struct sock
*sk
, int len
,
6089 char __user
*optval
, int __user
*optlen
)
6091 struct sctp_sock
*sp
= sctp_sk(sk
);
6092 struct sctp_association
*asoc
;
6095 if (sctp_style(sk
, TCP
))
6098 if (len
< sizeof(u32
))
6103 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6107 if (put_user(len
, optlen
))
6109 if (copy_to_user(optval
, &val
, len
))
6116 * 8.1.23 SCTP_AUTO_ASCONF
6117 * See the corresponding setsockopt entry as description
6119 static int sctp_getsockopt_auto_asconf(struct sock
*sk
, int len
,
6120 char __user
*optval
, int __user
*optlen
)
6124 if (len
< sizeof(int))
6128 if (sctp_sk(sk
)->do_auto_asconf
&& sctp_is_ep_boundall(sk
))
6130 if (put_user(len
, optlen
))
6132 if (copy_to_user(optval
, &val
, len
))
6138 * 8.2.6. Get the Current Identifiers of Associations
6139 * (SCTP_GET_ASSOC_ID_LIST)
6141 * This option gets the current list of SCTP association identifiers of
6142 * the SCTP associations handled by a one-to-many style socket.
6144 static int sctp_getsockopt_assoc_ids(struct sock
*sk
, int len
,
6145 char __user
*optval
, int __user
*optlen
)
6147 struct sctp_sock
*sp
= sctp_sk(sk
);
6148 struct sctp_association
*asoc
;
6149 struct sctp_assoc_ids
*ids
;
6152 if (sctp_style(sk
, TCP
))
6155 if (len
< sizeof(struct sctp_assoc_ids
))
6158 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6162 if (len
< sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
)
6165 len
= sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
;
6167 ids
= kmalloc(len
, GFP_USER
| __GFP_NOWARN
);
6171 ids
->gaids_number_of_ids
= num
;
6173 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6174 ids
->gaids_assoc_id
[num
++] = asoc
->assoc_id
;
6177 if (put_user(len
, optlen
) || copy_to_user(optval
, ids
, len
)) {
6187 * SCTP_PEER_ADDR_THLDS
6189 * This option allows us to fetch the partially failed threshold for one or all
6190 * transports in an association. See Section 6.1 of:
6191 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6193 static int sctp_getsockopt_paddr_thresholds(struct sock
*sk
,
6194 char __user
*optval
,
6198 struct sctp_paddrthlds val
;
6199 struct sctp_transport
*trans
;
6200 struct sctp_association
*asoc
;
6202 if (len
< sizeof(struct sctp_paddrthlds
))
6204 len
= sizeof(struct sctp_paddrthlds
);
6205 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
, len
))
6208 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
6209 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
6213 val
.spt_pathpfthld
= asoc
->pf_retrans
;
6214 val
.spt_pathmaxrxt
= asoc
->pathmaxrxt
;
6216 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
6221 val
.spt_pathmaxrxt
= trans
->pathmaxrxt
;
6222 val
.spt_pathpfthld
= trans
->pf_retrans
;
6225 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
6232 * SCTP_GET_ASSOC_STATS
6234 * This option retrieves local per endpoint statistics. It is modeled
6235 * after OpenSolaris' implementation
6237 static int sctp_getsockopt_assoc_stats(struct sock
*sk
, int len
,
6238 char __user
*optval
,
6241 struct sctp_assoc_stats sas
;
6242 struct sctp_association
*asoc
= NULL
;
6244 /* User must provide at least the assoc id */
6245 if (len
< sizeof(sctp_assoc_t
))
6248 /* Allow the struct to grow and fill in as much as possible */
6249 len
= min_t(size_t, len
, sizeof(sas
));
6251 if (copy_from_user(&sas
, optval
, len
))
6254 asoc
= sctp_id2assoc(sk
, sas
.sas_assoc_id
);
6258 sas
.sas_rtxchunks
= asoc
->stats
.rtxchunks
;
6259 sas
.sas_gapcnt
= asoc
->stats
.gapcnt
;
6260 sas
.sas_outofseqtsns
= asoc
->stats
.outofseqtsns
;
6261 sas
.sas_osacks
= asoc
->stats
.osacks
;
6262 sas
.sas_isacks
= asoc
->stats
.isacks
;
6263 sas
.sas_octrlchunks
= asoc
->stats
.octrlchunks
;
6264 sas
.sas_ictrlchunks
= asoc
->stats
.ictrlchunks
;
6265 sas
.sas_oodchunks
= asoc
->stats
.oodchunks
;
6266 sas
.sas_iodchunks
= asoc
->stats
.iodchunks
;
6267 sas
.sas_ouodchunks
= asoc
->stats
.ouodchunks
;
6268 sas
.sas_iuodchunks
= asoc
->stats
.iuodchunks
;
6269 sas
.sas_idupchunks
= asoc
->stats
.idupchunks
;
6270 sas
.sas_opackets
= asoc
->stats
.opackets
;
6271 sas
.sas_ipackets
= asoc
->stats
.ipackets
;
6273 /* New high max rto observed, will return 0 if not a single
6274 * RTO update took place. obs_rto_ipaddr will be bogus
6277 sas
.sas_maxrto
= asoc
->stats
.max_obs_rto
;
6278 memcpy(&sas
.sas_obs_rto_ipaddr
, &asoc
->stats
.obs_rto_ipaddr
,
6279 sizeof(struct sockaddr_storage
));
6281 /* Mark beginning of a new observation period */
6282 asoc
->stats
.max_obs_rto
= asoc
->rto_min
;
6284 if (put_user(len
, optlen
))
6287 pr_debug("%s: len:%d, assoc_id:%d\n", __func__
, len
, sas
.sas_assoc_id
);
6289 if (copy_to_user(optval
, &sas
, len
))
6295 static int sctp_getsockopt_recvrcvinfo(struct sock
*sk
, int len
,
6296 char __user
*optval
,
6301 if (len
< sizeof(int))
6305 if (sctp_sk(sk
)->recvrcvinfo
)
6307 if (put_user(len
, optlen
))
6309 if (copy_to_user(optval
, &val
, len
))
6315 static int sctp_getsockopt_recvnxtinfo(struct sock
*sk
, int len
,
6316 char __user
*optval
,
6321 if (len
< sizeof(int))
6325 if (sctp_sk(sk
)->recvnxtinfo
)
6327 if (put_user(len
, optlen
))
6329 if (copy_to_user(optval
, &val
, len
))
6335 static int sctp_getsockopt_pr_supported(struct sock
*sk
, int len
,
6336 char __user
*optval
,
6339 struct sctp_assoc_value params
;
6340 struct sctp_association
*asoc
;
6341 int retval
= -EFAULT
;
6343 if (len
< sizeof(params
)) {
6348 len
= sizeof(params
);
6349 if (copy_from_user(¶ms
, optval
, len
))
6352 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6354 params
.assoc_value
= asoc
->prsctp_enable
;
6355 } else if (!params
.assoc_id
) {
6356 struct sctp_sock
*sp
= sctp_sk(sk
);
6358 params
.assoc_value
= sp
->ep
->prsctp_enable
;
6364 if (put_user(len
, optlen
))
6367 if (copy_to_user(optval
, ¶ms
, len
))
6376 static int sctp_getsockopt_default_prinfo(struct sock
*sk
, int len
,
6377 char __user
*optval
,
6380 struct sctp_default_prinfo info
;
6381 struct sctp_association
*asoc
;
6382 int retval
= -EFAULT
;
6384 if (len
< sizeof(info
)) {
6390 if (copy_from_user(&info
, optval
, len
))
6393 asoc
= sctp_id2assoc(sk
, info
.pr_assoc_id
);
6395 info
.pr_policy
= SCTP_PR_POLICY(asoc
->default_flags
);
6396 info
.pr_value
= asoc
->default_timetolive
;
6397 } else if (!info
.pr_assoc_id
) {
6398 struct sctp_sock
*sp
= sctp_sk(sk
);
6400 info
.pr_policy
= SCTP_PR_POLICY(sp
->default_flags
);
6401 info
.pr_value
= sp
->default_timetolive
;
6407 if (put_user(len
, optlen
))
6410 if (copy_to_user(optval
, &info
, len
))
6419 static int sctp_getsockopt_pr_assocstatus(struct sock
*sk
, int len
,
6420 char __user
*optval
,
6423 struct sctp_prstatus params
;
6424 struct sctp_association
*asoc
;
6426 int retval
= -EINVAL
;
6428 if (len
< sizeof(params
))
6431 len
= sizeof(params
);
6432 if (copy_from_user(¶ms
, optval
, len
)) {
6437 policy
= params
.sprstat_policy
;
6438 if (policy
& ~SCTP_PR_SCTP_MASK
)
6441 asoc
= sctp_id2assoc(sk
, params
.sprstat_assoc_id
);
6445 if (policy
== SCTP_PR_SCTP_NONE
) {
6446 params
.sprstat_abandoned_unsent
= 0;
6447 params
.sprstat_abandoned_sent
= 0;
6448 for (policy
= 0; policy
<= SCTP_PR_INDEX(MAX
); policy
++) {
6449 params
.sprstat_abandoned_unsent
+=
6450 asoc
->abandoned_unsent
[policy
];
6451 params
.sprstat_abandoned_sent
+=
6452 asoc
->abandoned_sent
[policy
];
6455 params
.sprstat_abandoned_unsent
=
6456 asoc
->abandoned_unsent
[__SCTP_PR_INDEX(policy
)];
6457 params
.sprstat_abandoned_sent
=
6458 asoc
->abandoned_sent
[__SCTP_PR_INDEX(policy
)];
6461 if (put_user(len
, optlen
)) {
6466 if (copy_to_user(optval
, ¶ms
, len
)) {
6477 static int sctp_getsockopt_enable_strreset(struct sock
*sk
, int len
,
6478 char __user
*optval
,
6481 struct sctp_assoc_value params
;
6482 struct sctp_association
*asoc
;
6483 int retval
= -EFAULT
;
6485 if (len
< sizeof(params
)) {
6490 len
= sizeof(params
);
6491 if (copy_from_user(¶ms
, optval
, len
))
6494 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6496 params
.assoc_value
= asoc
->strreset_enable
;
6497 } else if (!params
.assoc_id
) {
6498 struct sctp_sock
*sp
= sctp_sk(sk
);
6500 params
.assoc_value
= sp
->ep
->strreset_enable
;
6506 if (put_user(len
, optlen
))
6509 if (copy_to_user(optval
, ¶ms
, len
))
6518 static int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
6519 char __user
*optval
, int __user
*optlen
)
6524 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
6526 /* I can hardly begin to describe how wrong this is. This is
6527 * so broken as to be worse than useless. The API draft
6528 * REALLY is NOT helpful here... I am not convinced that the
6529 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
6530 * are at all well-founded.
6532 if (level
!= SOL_SCTP
) {
6533 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
6535 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
6539 if (get_user(len
, optlen
))
6549 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
6551 case SCTP_DISABLE_FRAGMENTS
:
6552 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
6556 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
6558 case SCTP_AUTOCLOSE
:
6559 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
6561 case SCTP_SOCKOPT_PEELOFF
:
6562 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
6564 case SCTP_PEER_ADDR_PARAMS
:
6565 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
6568 case SCTP_DELAYED_SACK
:
6569 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
6573 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
6575 case SCTP_GET_PEER_ADDRS
:
6576 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
6579 case SCTP_GET_LOCAL_ADDRS
:
6580 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
6583 case SCTP_SOCKOPT_CONNECTX3
:
6584 retval
= sctp_getsockopt_connectx3(sk
, len
, optval
, optlen
);
6586 case SCTP_DEFAULT_SEND_PARAM
:
6587 retval
= sctp_getsockopt_default_send_param(sk
, len
,
6590 case SCTP_DEFAULT_SNDINFO
:
6591 retval
= sctp_getsockopt_default_sndinfo(sk
, len
,
6594 case SCTP_PRIMARY_ADDR
:
6595 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
6598 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
6601 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
6603 case SCTP_ASSOCINFO
:
6604 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
6606 case SCTP_I_WANT_MAPPED_V4_ADDR
:
6607 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
6610 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
6612 case SCTP_GET_PEER_ADDR_INFO
:
6613 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
6616 case SCTP_ADAPTATION_LAYER
:
6617 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
6621 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
6623 case SCTP_FRAGMENT_INTERLEAVE
:
6624 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
6627 case SCTP_PARTIAL_DELIVERY_POINT
:
6628 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
6631 case SCTP_MAX_BURST
:
6632 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
6635 case SCTP_AUTH_CHUNK
:
6636 case SCTP_AUTH_DELETE_KEY
:
6637 retval
= -EOPNOTSUPP
;
6639 case SCTP_HMAC_IDENT
:
6640 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
6642 case SCTP_AUTH_ACTIVE_KEY
:
6643 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
6645 case SCTP_PEER_AUTH_CHUNKS
:
6646 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
6649 case SCTP_LOCAL_AUTH_CHUNKS
:
6650 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
6653 case SCTP_GET_ASSOC_NUMBER
:
6654 retval
= sctp_getsockopt_assoc_number(sk
, len
, optval
, optlen
);
6656 case SCTP_GET_ASSOC_ID_LIST
:
6657 retval
= sctp_getsockopt_assoc_ids(sk
, len
, optval
, optlen
);
6659 case SCTP_AUTO_ASCONF
:
6660 retval
= sctp_getsockopt_auto_asconf(sk
, len
, optval
, optlen
);
6662 case SCTP_PEER_ADDR_THLDS
:
6663 retval
= sctp_getsockopt_paddr_thresholds(sk
, optval
, len
, optlen
);
6665 case SCTP_GET_ASSOC_STATS
:
6666 retval
= sctp_getsockopt_assoc_stats(sk
, len
, optval
, optlen
);
6668 case SCTP_RECVRCVINFO
:
6669 retval
= sctp_getsockopt_recvrcvinfo(sk
, len
, optval
, optlen
);
6671 case SCTP_RECVNXTINFO
:
6672 retval
= sctp_getsockopt_recvnxtinfo(sk
, len
, optval
, optlen
);
6674 case SCTP_PR_SUPPORTED
:
6675 retval
= sctp_getsockopt_pr_supported(sk
, len
, optval
, optlen
);
6677 case SCTP_DEFAULT_PRINFO
:
6678 retval
= sctp_getsockopt_default_prinfo(sk
, len
, optval
,
6681 case SCTP_PR_ASSOC_STATUS
:
6682 retval
= sctp_getsockopt_pr_assocstatus(sk
, len
, optval
,
6685 case SCTP_ENABLE_STREAM_RESET
:
6686 retval
= sctp_getsockopt_enable_strreset(sk
, len
, optval
,
6690 retval
= -ENOPROTOOPT
;
6698 static int sctp_hash(struct sock
*sk
)
6704 static void sctp_unhash(struct sock
*sk
)
6709 /* Check if port is acceptable. Possibly find first available port.
6711 * The port hash table (contained in the 'global' SCTP protocol storage
6712 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6713 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6714 * list (the list number is the port number hashed out, so as you
6715 * would expect from a hash function, all the ports in a given list have
6716 * such a number that hashes out to the same list number; you were
6717 * expecting that, right?); so each list has a set of ports, with a
6718 * link to the socket (struct sock) that uses it, the port number and
6719 * a fastreuse flag (FIXME: NPI ipg).
6721 static struct sctp_bind_bucket
*sctp_bucket_create(
6722 struct sctp_bind_hashbucket
*head
, struct net
*, unsigned short snum
);
6724 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
6726 struct sctp_bind_hashbucket
*head
; /* hash list */
6727 struct sctp_bind_bucket
*pp
;
6728 unsigned short snum
;
6731 snum
= ntohs(addr
->v4
.sin_port
);
6733 pr_debug("%s: begins, snum:%d\n", __func__
, snum
);
6738 /* Search for an available port. */
6739 int low
, high
, remaining
, index
;
6741 struct net
*net
= sock_net(sk
);
6743 inet_get_local_port_range(net
, &low
, &high
);
6744 remaining
= (high
- low
) + 1;
6745 rover
= prandom_u32() % remaining
+ low
;
6749 if ((rover
< low
) || (rover
> high
))
6751 if (inet_is_local_reserved_port(net
, rover
))
6753 index
= sctp_phashfn(sock_net(sk
), rover
);
6754 head
= &sctp_port_hashtable
[index
];
6755 spin_lock(&head
->lock
);
6756 sctp_for_each_hentry(pp
, &head
->chain
)
6757 if ((pp
->port
== rover
) &&
6758 net_eq(sock_net(sk
), pp
->net
))
6762 spin_unlock(&head
->lock
);
6763 } while (--remaining
> 0);
6765 /* Exhausted local port range during search? */
6770 /* OK, here is the one we will use. HEAD (the port
6771 * hash table list entry) is non-NULL and we hold it's
6776 /* We are given an specific port number; we verify
6777 * that it is not being used. If it is used, we will
6778 * exahust the search in the hash list corresponding
6779 * to the port number (snum) - we detect that with the
6780 * port iterator, pp being NULL.
6782 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
), snum
)];
6783 spin_lock(&head
->lock
);
6784 sctp_for_each_hentry(pp
, &head
->chain
) {
6785 if ((pp
->port
== snum
) && net_eq(pp
->net
, sock_net(sk
)))
6792 if (!hlist_empty(&pp
->owner
)) {
6793 /* We had a port hash table hit - there is an
6794 * available port (pp != NULL) and it is being
6795 * used by other socket (pp->owner not empty); that other
6796 * socket is going to be sk2.
6798 int reuse
= sk
->sk_reuse
;
6801 pr_debug("%s: found a possible match\n", __func__
);
6803 if (pp
->fastreuse
&& sk
->sk_reuse
&&
6804 sk
->sk_state
!= SCTP_SS_LISTENING
)
6807 /* Run through the list of sockets bound to the port
6808 * (pp->port) [via the pointers bind_next and
6809 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
6810 * we get the endpoint they describe and run through
6811 * the endpoint's list of IP (v4 or v6) addresses,
6812 * comparing each of the addresses with the address of
6813 * the socket sk. If we find a match, then that means
6814 * that this port/socket (sk) combination are already
6817 sk_for_each_bound(sk2
, &pp
->owner
) {
6818 struct sctp_endpoint
*ep2
;
6819 ep2
= sctp_sk(sk2
)->ep
;
6822 (reuse
&& sk2
->sk_reuse
&&
6823 sk2
->sk_state
!= SCTP_SS_LISTENING
))
6826 if (sctp_bind_addr_conflict(&ep2
->base
.bind_addr
, addr
,
6827 sctp_sk(sk2
), sctp_sk(sk
))) {
6833 pr_debug("%s: found a match\n", __func__
);
6836 /* If there was a hash table miss, create a new port. */
6838 if (!pp
&& !(pp
= sctp_bucket_create(head
, sock_net(sk
), snum
)))
6841 /* In either case (hit or miss), make sure fastreuse is 1 only
6842 * if sk->sk_reuse is too (that is, if the caller requested
6843 * SO_REUSEADDR on this socket -sk-).
6845 if (hlist_empty(&pp
->owner
)) {
6846 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
6850 } else if (pp
->fastreuse
&&
6851 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
6854 /* We are set, so fill up all the data in the hash table
6855 * entry, tie the socket list information with the rest of the
6856 * sockets FIXME: Blurry, NPI (ipg).
6859 if (!sctp_sk(sk
)->bind_hash
) {
6860 inet_sk(sk
)->inet_num
= snum
;
6861 sk_add_bind_node(sk
, &pp
->owner
);
6862 sctp_sk(sk
)->bind_hash
= pp
;
6867 spin_unlock(&head
->lock
);
6874 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6875 * port is requested.
6877 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
6879 union sctp_addr addr
;
6880 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
6882 /* Set up a dummy address struct from the sk. */
6883 af
->from_sk(&addr
, sk
);
6884 addr
.v4
.sin_port
= htons(snum
);
6886 /* Note: sk->sk_num gets filled in if ephemeral port request. */
6887 return !!sctp_get_port_local(sk
, &addr
);
6891 * Move a socket to LISTENING state.
6893 static int sctp_listen_start(struct sock
*sk
, int backlog
)
6895 struct sctp_sock
*sp
= sctp_sk(sk
);
6896 struct sctp_endpoint
*ep
= sp
->ep
;
6897 struct crypto_shash
*tfm
= NULL
;
6900 /* Allocate HMAC for generating cookie. */
6901 if (!sp
->hmac
&& sp
->sctp_hmac_alg
) {
6902 sprintf(alg
, "hmac(%s)", sp
->sctp_hmac_alg
);
6903 tfm
= crypto_alloc_shash(alg
, 0, 0);
6905 net_info_ratelimited("failed to load transform for %s: %ld\n",
6906 sp
->sctp_hmac_alg
, PTR_ERR(tfm
));
6909 sctp_sk(sk
)->hmac
= tfm
;
6913 * If a bind() or sctp_bindx() is not called prior to a listen()
6914 * call that allows new associations to be accepted, the system
6915 * picks an ephemeral port and will choose an address set equivalent
6916 * to binding with a wildcard address.
6918 * This is not currently spelled out in the SCTP sockets
6919 * extensions draft, but follows the practice as seen in TCP
6923 sk
->sk_state
= SCTP_SS_LISTENING
;
6924 if (!ep
->base
.bind_addr
.port
) {
6925 if (sctp_autobind(sk
))
6928 if (sctp_get_port(sk
, inet_sk(sk
)->inet_num
)) {
6929 sk
->sk_state
= SCTP_SS_CLOSED
;
6934 sk
->sk_max_ack_backlog
= backlog
;
6935 sctp_hash_endpoint(ep
);
6940 * 4.1.3 / 5.1.3 listen()
6942 * By default, new associations are not accepted for UDP style sockets.
6943 * An application uses listen() to mark a socket as being able to
6944 * accept new associations.
6946 * On TCP style sockets, applications use listen() to ready the SCTP
6947 * endpoint for accepting inbound associations.
6949 * On both types of endpoints a backlog of '0' disables listening.
6951 * Move a socket to LISTENING state.
6953 int sctp_inet_listen(struct socket
*sock
, int backlog
)
6955 struct sock
*sk
= sock
->sk
;
6956 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6959 if (unlikely(backlog
< 0))
6964 /* Peeled-off sockets are not allowed to listen(). */
6965 if (sctp_style(sk
, UDP_HIGH_BANDWIDTH
))
6968 if (sock
->state
!= SS_UNCONNECTED
)
6971 /* If backlog is zero, disable listening. */
6973 if (sctp_sstate(sk
, CLOSED
))
6977 sctp_unhash_endpoint(ep
);
6978 sk
->sk_state
= SCTP_SS_CLOSED
;
6980 sctp_sk(sk
)->bind_hash
->fastreuse
= 1;
6984 /* If we are already listening, just update the backlog */
6985 if (sctp_sstate(sk
, LISTENING
))
6986 sk
->sk_max_ack_backlog
= backlog
;
6988 err
= sctp_listen_start(sk
, backlog
);
7000 * This function is done by modeling the current datagram_poll() and the
7001 * tcp_poll(). Note that, based on these implementations, we don't
7002 * lock the socket in this function, even though it seems that,
7003 * ideally, locking or some other mechanisms can be used to ensure
7004 * the integrity of the counters (sndbuf and wmem_alloc) used
7005 * in this place. We assume that we don't need locks either until proven
7008 * Another thing to note is that we include the Async I/O support
7009 * here, again, by modeling the current TCP/UDP code. We don't have
7010 * a good way to test with it yet.
7012 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
7014 struct sock
*sk
= sock
->sk
;
7015 struct sctp_sock
*sp
= sctp_sk(sk
);
7018 poll_wait(file
, sk_sleep(sk
), wait
);
7020 sock_rps_record_flow(sk
);
7022 /* A TCP-style listening socket becomes readable when the accept queue
7025 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
7026 return (!list_empty(&sp
->ep
->asocs
)) ?
7027 (POLLIN
| POLLRDNORM
) : 0;
7031 /* Is there any exceptional events? */
7032 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
7034 (sock_flag(sk
, SOCK_SELECT_ERR_QUEUE
) ? POLLPRI
: 0);
7035 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7036 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
7037 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
7040 /* Is it readable? Reconsider this code with TCP-style support. */
7041 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7042 mask
|= POLLIN
| POLLRDNORM
;
7044 /* The association is either gone or not ready. */
7045 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
7048 /* Is it writable? */
7049 if (sctp_writeable(sk
)) {
7050 mask
|= POLLOUT
| POLLWRNORM
;
7052 sk_set_bit(SOCKWQ_ASYNC_NOSPACE
, sk
);
7054 * Since the socket is not locked, the buffer
7055 * might be made available after the writeable check and
7056 * before the bit is set. This could cause a lost I/O
7057 * signal. tcp_poll() has a race breaker for this race
7058 * condition. Based on their implementation, we put
7059 * in the following code to cover it as well.
7061 if (sctp_writeable(sk
))
7062 mask
|= POLLOUT
| POLLWRNORM
;
7067 /********************************************************************
7068 * 2nd Level Abstractions
7069 ********************************************************************/
7071 static struct sctp_bind_bucket
*sctp_bucket_create(
7072 struct sctp_bind_hashbucket
*head
, struct net
*net
, unsigned short snum
)
7074 struct sctp_bind_bucket
*pp
;
7076 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
7078 SCTP_DBG_OBJCNT_INC(bind_bucket
);
7081 INIT_HLIST_HEAD(&pp
->owner
);
7083 hlist_add_head(&pp
->node
, &head
->chain
);
7088 /* Caller must hold hashbucket lock for this tb with local BH disabled */
7089 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
7091 if (pp
&& hlist_empty(&pp
->owner
)) {
7092 __hlist_del(&pp
->node
);
7093 kmem_cache_free(sctp_bucket_cachep
, pp
);
7094 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
7098 /* Release this socket's reference to a local port. */
7099 static inline void __sctp_put_port(struct sock
*sk
)
7101 struct sctp_bind_hashbucket
*head
=
7102 &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
),
7103 inet_sk(sk
)->inet_num
)];
7104 struct sctp_bind_bucket
*pp
;
7106 spin_lock(&head
->lock
);
7107 pp
= sctp_sk(sk
)->bind_hash
;
7108 __sk_del_bind_node(sk
);
7109 sctp_sk(sk
)->bind_hash
= NULL
;
7110 inet_sk(sk
)->inet_num
= 0;
7111 sctp_bucket_destroy(pp
);
7112 spin_unlock(&head
->lock
);
7115 void sctp_put_port(struct sock
*sk
)
7118 __sctp_put_port(sk
);
7123 * The system picks an ephemeral port and choose an address set equivalent
7124 * to binding with a wildcard address.
7125 * One of those addresses will be the primary address for the association.
7126 * This automatically enables the multihoming capability of SCTP.
7128 static int sctp_autobind(struct sock
*sk
)
7130 union sctp_addr autoaddr
;
7134 /* Initialize a local sockaddr structure to INADDR_ANY. */
7135 af
= sctp_sk(sk
)->pf
->af
;
7137 port
= htons(inet_sk(sk
)->inet_num
);
7138 af
->inaddr_any(&autoaddr
, port
);
7140 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
7143 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
7146 * 4.2 The cmsghdr Structure *
7148 * When ancillary data is sent or received, any number of ancillary data
7149 * objects can be specified by the msg_control and msg_controllen members of
7150 * the msghdr structure, because each object is preceded by
7151 * a cmsghdr structure defining the object's length (the cmsg_len member).
7152 * Historically Berkeley-derived implementations have passed only one object
7153 * at a time, but this API allows multiple objects to be
7154 * passed in a single call to sendmsg() or recvmsg(). The following example
7155 * shows two ancillary data objects in a control buffer.
7157 * |<--------------------------- msg_controllen -------------------------->|
7160 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
7162 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
7165 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
7167 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
7170 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7171 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
7173 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
7175 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7182 static int sctp_msghdr_parse(const struct msghdr
*msg
, sctp_cmsgs_t
*cmsgs
)
7184 struct cmsghdr
*cmsg
;
7185 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
7187 for_each_cmsghdr(cmsg
, my_msg
) {
7188 if (!CMSG_OK(my_msg
, cmsg
))
7191 /* Should we parse this header or ignore? */
7192 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
7195 /* Strictly check lengths following example in SCM code. */
7196 switch (cmsg
->cmsg_type
) {
7198 /* SCTP Socket API Extension
7199 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
7201 * This cmsghdr structure provides information for
7202 * initializing new SCTP associations with sendmsg().
7203 * The SCTP_INITMSG socket option uses this same data
7204 * structure. This structure is not used for
7207 * cmsg_level cmsg_type cmsg_data[]
7208 * ------------ ------------ ----------------------
7209 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
7211 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_initmsg
)))
7214 cmsgs
->init
= CMSG_DATA(cmsg
);
7218 /* SCTP Socket API Extension
7219 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
7221 * This cmsghdr structure specifies SCTP options for
7222 * sendmsg() and describes SCTP header information
7223 * about a received message through recvmsg().
7225 * cmsg_level cmsg_type cmsg_data[]
7226 * ------------ ------------ ----------------------
7227 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
7229 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
7232 cmsgs
->srinfo
= CMSG_DATA(cmsg
);
7234 if (cmsgs
->srinfo
->sinfo_flags
&
7235 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
7236 SCTP_SACK_IMMEDIATELY
| SCTP_PR_SCTP_MASK
|
7237 SCTP_ABORT
| SCTP_EOF
))
7242 /* SCTP Socket API Extension
7243 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
7245 * This cmsghdr structure specifies SCTP options for
7246 * sendmsg(). This structure and SCTP_RCVINFO replaces
7247 * SCTP_SNDRCV which has been deprecated.
7249 * cmsg_level cmsg_type cmsg_data[]
7250 * ------------ ------------ ---------------------
7251 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
7253 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_sndinfo
)))
7256 cmsgs
->sinfo
= CMSG_DATA(cmsg
);
7258 if (cmsgs
->sinfo
->snd_flags
&
7259 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
7260 SCTP_SACK_IMMEDIATELY
| SCTP_PR_SCTP_MASK
|
7261 SCTP_ABORT
| SCTP_EOF
))
7273 * Wait for a packet..
7274 * Note: This function is the same function as in core/datagram.c
7275 * with a few modifications to make lksctp work.
7277 static int sctp_wait_for_packet(struct sock
*sk
, int *err
, long *timeo_p
)
7282 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
7284 /* Socket errors? */
7285 error
= sock_error(sk
);
7289 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7292 /* Socket shut down? */
7293 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7296 /* Sequenced packets can come disconnected. If so we report the
7301 /* Is there a good reason to think that we may receive some data? */
7302 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
7305 /* Handle signals. */
7306 if (signal_pending(current
))
7309 /* Let another process have a go. Since we are going to sleep
7310 * anyway. Note: This may cause odd behaviors if the message
7311 * does not fit in the user's buffer, but this seems to be the
7312 * only way to honor MSG_DONTWAIT realistically.
7315 *timeo_p
= schedule_timeout(*timeo_p
);
7319 finish_wait(sk_sleep(sk
), &wait
);
7323 error
= sock_intr_errno(*timeo_p
);
7326 finish_wait(sk_sleep(sk
), &wait
);
7331 /* Receive a datagram.
7332 * Note: This is pretty much the same routine as in core/datagram.c
7333 * with a few changes to make lksctp work.
7335 struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
7336 int noblock
, int *err
)
7339 struct sk_buff
*skb
;
7342 timeo
= sock_rcvtimeo(sk
, noblock
);
7344 pr_debug("%s: timeo:%ld, max:%ld\n", __func__
, timeo
,
7345 MAX_SCHEDULE_TIMEOUT
);
7348 /* Again only user level code calls this function,
7349 * so nothing interrupt level
7350 * will suddenly eat the receive_queue.
7352 * Look at current nfs client by the way...
7353 * However, this function was correct in any case. 8)
7355 if (flags
& MSG_PEEK
) {
7356 skb
= skb_peek(&sk
->sk_receive_queue
);
7358 atomic_inc(&skb
->users
);
7360 skb
= __skb_dequeue(&sk
->sk_receive_queue
);
7366 /* Caller is allowed not to check sk->sk_err before calling. */
7367 error
= sock_error(sk
);
7371 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7374 if (sk_can_busy_loop(sk
) &&
7375 sk_busy_loop(sk
, noblock
))
7378 /* User doesn't want to wait. */
7382 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
7391 /* If sndbuf has changed, wake up per association sndbuf waiters. */
7392 static void __sctp_write_space(struct sctp_association
*asoc
)
7394 struct sock
*sk
= asoc
->base
.sk
;
7396 if (sctp_wspace(asoc
) <= 0)
7399 if (waitqueue_active(&asoc
->wait
))
7400 wake_up_interruptible(&asoc
->wait
);
7402 if (sctp_writeable(sk
)) {
7403 struct socket_wq
*wq
;
7406 wq
= rcu_dereference(sk
->sk_wq
);
7408 if (waitqueue_active(&wq
->wait
))
7409 wake_up_interruptible(&wq
->wait
);
7411 /* Note that we try to include the Async I/O support
7412 * here by modeling from the current TCP/UDP code.
7413 * We have not tested with it yet.
7415 if (!(sk
->sk_shutdown
& SEND_SHUTDOWN
))
7416 sock_wake_async(wq
, SOCK_WAKE_SPACE
, POLL_OUT
);
7422 static void sctp_wake_up_waiters(struct sock
*sk
,
7423 struct sctp_association
*asoc
)
7425 struct sctp_association
*tmp
= asoc
;
7427 /* We do accounting for the sndbuf space per association,
7428 * so we only need to wake our own association.
7430 if (asoc
->ep
->sndbuf_policy
)
7431 return __sctp_write_space(asoc
);
7433 /* If association goes down and is just flushing its
7434 * outq, then just normally notify others.
7436 if (asoc
->base
.dead
)
7437 return sctp_write_space(sk
);
7439 /* Accounting for the sndbuf space is per socket, so we
7440 * need to wake up others, try to be fair and in case of
7441 * other associations, let them have a go first instead
7442 * of just doing a sctp_write_space() call.
7444 * Note that we reach sctp_wake_up_waiters() only when
7445 * associations free up queued chunks, thus we are under
7446 * lock and the list of associations on a socket is
7447 * guaranteed not to change.
7449 for (tmp
= list_next_entry(tmp
, asocs
); 1;
7450 tmp
= list_next_entry(tmp
, asocs
)) {
7451 /* Manually skip the head element. */
7452 if (&tmp
->asocs
== &((sctp_sk(sk
))->ep
->asocs
))
7454 /* Wake up association. */
7455 __sctp_write_space(tmp
);
7456 /* We've reached the end. */
7462 /* Do accounting for the sndbuf space.
7463 * Decrement the used sndbuf space of the corresponding association by the
7464 * data size which was just transmitted(freed).
7466 static void sctp_wfree(struct sk_buff
*skb
)
7468 struct sctp_chunk
*chunk
= skb_shinfo(skb
)->destructor_arg
;
7469 struct sctp_association
*asoc
= chunk
->asoc
;
7470 struct sock
*sk
= asoc
->base
.sk
;
7472 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
7473 sizeof(struct sk_buff
) +
7474 sizeof(struct sctp_chunk
);
7476 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
7479 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
7481 sk
->sk_wmem_queued
-= skb
->truesize
;
7482 sk_mem_uncharge(sk
, skb
->truesize
);
7485 sctp_wake_up_waiters(sk
, asoc
);
7487 sctp_association_put(asoc
);
7490 /* Do accounting for the receive space on the socket.
7491 * Accounting for the association is done in ulpevent.c
7492 * We set this as a destructor for the cloned data skbs so that
7493 * accounting is done at the correct time.
7495 void sctp_sock_rfree(struct sk_buff
*skb
)
7497 struct sock
*sk
= skb
->sk
;
7498 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
7500 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
7503 * Mimic the behavior of sock_rfree
7505 sk_mem_uncharge(sk
, event
->rmem_len
);
7509 /* Helper function to wait for space in the sndbuf. */
7510 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
7513 struct sock
*sk
= asoc
->base
.sk
;
7515 long current_timeo
= *timeo_p
;
7518 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__
, asoc
,
7521 /* Increment the association's refcnt. */
7522 sctp_association_hold(asoc
);
7524 /* Wait on the association specific sndbuf space. */
7526 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
7527 TASK_INTERRUPTIBLE
);
7530 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
7533 if (signal_pending(current
))
7534 goto do_interrupted
;
7535 if (msg_len
<= sctp_wspace(asoc
))
7538 /* Let another process have a go. Since we are going
7542 current_timeo
= schedule_timeout(current_timeo
);
7543 BUG_ON(sk
!= asoc
->base
.sk
);
7546 *timeo_p
= current_timeo
;
7550 finish_wait(&asoc
->wait
, &wait
);
7552 /* Release the association's refcnt. */
7553 sctp_association_put(asoc
);
7562 err
= sock_intr_errno(*timeo_p
);
7570 void sctp_data_ready(struct sock
*sk
)
7572 struct socket_wq
*wq
;
7575 wq
= rcu_dereference(sk
->sk_wq
);
7576 if (skwq_has_sleeper(wq
))
7577 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
7578 POLLRDNORM
| POLLRDBAND
);
7579 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
7583 /* If socket sndbuf has changed, wake up all per association waiters. */
7584 void sctp_write_space(struct sock
*sk
)
7586 struct sctp_association
*asoc
;
7588 /* Wake up the tasks in each wait queue. */
7589 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
7590 __sctp_write_space(asoc
);
7594 /* Is there any sndbuf space available on the socket?
7596 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
7597 * associations on the same socket. For a UDP-style socket with
7598 * multiple associations, it is possible for it to be "unwriteable"
7599 * prematurely. I assume that this is acceptable because
7600 * a premature "unwriteable" is better than an accidental "writeable" which
7601 * would cause an unwanted block under certain circumstances. For the 1-1
7602 * UDP-style sockets or TCP-style sockets, this code should work.
7605 static int sctp_writeable(struct sock
*sk
)
7609 amt
= sk
->sk_sndbuf
- sk_wmem_alloc_get(sk
);
7615 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7616 * returns immediately with EINPROGRESS.
7618 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
7620 struct sock
*sk
= asoc
->base
.sk
;
7622 long current_timeo
= *timeo_p
;
7625 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__
, asoc
, *timeo_p
);
7627 /* Increment the association's refcnt. */
7628 sctp_association_hold(asoc
);
7631 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
7632 TASK_INTERRUPTIBLE
);
7635 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7637 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
7640 if (signal_pending(current
))
7641 goto do_interrupted
;
7643 if (sctp_state(asoc
, ESTABLISHED
))
7646 /* Let another process have a go. Since we are going
7650 current_timeo
= schedule_timeout(current_timeo
);
7653 *timeo_p
= current_timeo
;
7657 finish_wait(&asoc
->wait
, &wait
);
7659 /* Release the association's refcnt. */
7660 sctp_association_put(asoc
);
7665 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
7668 err
= -ECONNREFUSED
;
7672 err
= sock_intr_errno(*timeo_p
);
7680 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
7682 struct sctp_endpoint
*ep
;
7686 ep
= sctp_sk(sk
)->ep
;
7690 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
7691 TASK_INTERRUPTIBLE
);
7693 if (list_empty(&ep
->asocs
)) {
7695 timeo
= schedule_timeout(timeo
);
7700 if (!sctp_sstate(sk
, LISTENING
))
7704 if (!list_empty(&ep
->asocs
))
7707 err
= sock_intr_errno(timeo
);
7708 if (signal_pending(current
))
7716 finish_wait(sk_sleep(sk
), &wait
);
7721 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
7726 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
7727 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
7730 timeout
= schedule_timeout(timeout
);
7732 } while (!signal_pending(current
) && timeout
);
7734 finish_wait(sk_sleep(sk
), &wait
);
7737 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
7739 struct sk_buff
*frag
;
7744 /* Don't forget the fragments. */
7745 skb_walk_frags(skb
, frag
)
7746 sctp_skb_set_owner_r_frag(frag
, sk
);
7749 sctp_skb_set_owner_r(skb
, sk
);
7752 void sctp_copy_sock(struct sock
*newsk
, struct sock
*sk
,
7753 struct sctp_association
*asoc
)
7755 struct inet_sock
*inet
= inet_sk(sk
);
7756 struct inet_sock
*newinet
;
7758 newsk
->sk_type
= sk
->sk_type
;
7759 newsk
->sk_bound_dev_if
= sk
->sk_bound_dev_if
;
7760 newsk
->sk_flags
= sk
->sk_flags
;
7761 newsk
->sk_tsflags
= sk
->sk_tsflags
;
7762 newsk
->sk_no_check_tx
= sk
->sk_no_check_tx
;
7763 newsk
->sk_no_check_rx
= sk
->sk_no_check_rx
;
7764 newsk
->sk_reuse
= sk
->sk_reuse
;
7766 newsk
->sk_shutdown
= sk
->sk_shutdown
;
7767 newsk
->sk_destruct
= sctp_destruct_sock
;
7768 newsk
->sk_family
= sk
->sk_family
;
7769 newsk
->sk_protocol
= IPPROTO_SCTP
;
7770 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
7771 newsk
->sk_sndbuf
= sk
->sk_sndbuf
;
7772 newsk
->sk_rcvbuf
= sk
->sk_rcvbuf
;
7773 newsk
->sk_lingertime
= sk
->sk_lingertime
;
7774 newsk
->sk_rcvtimeo
= sk
->sk_rcvtimeo
;
7775 newsk
->sk_sndtimeo
= sk
->sk_sndtimeo
;
7776 newsk
->sk_rxhash
= sk
->sk_rxhash
;
7778 newinet
= inet_sk(newsk
);
7780 /* Initialize sk's sport, dport, rcv_saddr and daddr for
7781 * getsockname() and getpeername()
7783 newinet
->inet_sport
= inet
->inet_sport
;
7784 newinet
->inet_saddr
= inet
->inet_saddr
;
7785 newinet
->inet_rcv_saddr
= inet
->inet_rcv_saddr
;
7786 newinet
->inet_dport
= htons(asoc
->peer
.port
);
7787 newinet
->pmtudisc
= inet
->pmtudisc
;
7788 newinet
->inet_id
= asoc
->next_tsn
^ jiffies
;
7790 newinet
->uc_ttl
= inet
->uc_ttl
;
7791 newinet
->mc_loop
= 1;
7792 newinet
->mc_ttl
= 1;
7793 newinet
->mc_index
= 0;
7794 newinet
->mc_list
= NULL
;
7796 if (newsk
->sk_flags
& SK_FLAGS_TIMESTAMP
)
7797 net_enable_timestamp();
7799 security_sk_clone(sk
, newsk
);
7802 static inline void sctp_copy_descendant(struct sock
*sk_to
,
7803 const struct sock
*sk_from
)
7805 int ancestor_size
= sizeof(struct inet_sock
) +
7806 sizeof(struct sctp_sock
) -
7807 offsetof(struct sctp_sock
, auto_asconf_list
);
7809 if (sk_from
->sk_family
== PF_INET6
)
7810 ancestor_size
+= sizeof(struct ipv6_pinfo
);
7812 __inet_sk_copy_descendant(sk_to
, sk_from
, ancestor_size
);
7815 /* Populate the fields of the newsk from the oldsk and migrate the assoc
7816 * and its messages to the newsk.
7818 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
7819 struct sctp_association
*assoc
,
7820 sctp_socket_type_t type
)
7822 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
7823 struct sctp_sock
*newsp
= sctp_sk(newsk
);
7824 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
7825 struct sctp_endpoint
*newep
= newsp
->ep
;
7826 struct sk_buff
*skb
, *tmp
;
7827 struct sctp_ulpevent
*event
;
7828 struct sctp_bind_hashbucket
*head
;
7830 /* Migrate socket buffer sizes and all the socket level options to the
7833 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
7834 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
7835 /* Brute force copy old sctp opt. */
7836 sctp_copy_descendant(newsk
, oldsk
);
7838 /* Restore the ep value that was overwritten with the above structure
7844 /* Hook this new socket in to the bind_hash list. */
7845 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(oldsk
),
7846 inet_sk(oldsk
)->inet_num
)];
7847 spin_lock_bh(&head
->lock
);
7848 pp
= sctp_sk(oldsk
)->bind_hash
;
7849 sk_add_bind_node(newsk
, &pp
->owner
);
7850 sctp_sk(newsk
)->bind_hash
= pp
;
7851 inet_sk(newsk
)->inet_num
= inet_sk(oldsk
)->inet_num
;
7852 spin_unlock_bh(&head
->lock
);
7854 /* Copy the bind_addr list from the original endpoint to the new
7855 * endpoint so that we can handle restarts properly
7857 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
7858 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
7860 /* Move any messages in the old socket's receive queue that are for the
7861 * peeled off association to the new socket's receive queue.
7863 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
7864 event
= sctp_skb2event(skb
);
7865 if (event
->asoc
== assoc
) {
7866 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
7867 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
7868 sctp_skb_set_owner_r_frag(skb
, newsk
);
7872 /* Clean up any messages pending delivery due to partial
7873 * delivery. Three cases:
7874 * 1) No partial deliver; no work.
7875 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
7876 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
7878 skb_queue_head_init(&newsp
->pd_lobby
);
7879 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
7881 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
7882 struct sk_buff_head
*queue
;
7884 /* Decide which queue to move pd_lobby skbs to. */
7885 if (assoc
->ulpq
.pd_mode
) {
7886 queue
= &newsp
->pd_lobby
;
7888 queue
= &newsk
->sk_receive_queue
;
7890 /* Walk through the pd_lobby, looking for skbs that
7891 * need moved to the new socket.
7893 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
7894 event
= sctp_skb2event(skb
);
7895 if (event
->asoc
== assoc
) {
7896 __skb_unlink(skb
, &oldsp
->pd_lobby
);
7897 __skb_queue_tail(queue
, skb
);
7898 sctp_skb_set_owner_r_frag(skb
, newsk
);
7902 /* Clear up any skbs waiting for the partial
7903 * delivery to finish.
7905 if (assoc
->ulpq
.pd_mode
)
7906 sctp_clear_pd(oldsk
, NULL
);
7910 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
)
7911 sctp_skb_set_owner_r_frag(skb
, newsk
);
7913 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
)
7914 sctp_skb_set_owner_r_frag(skb
, newsk
);
7916 /* Set the type of socket to indicate that it is peeled off from the
7917 * original UDP-style socket or created with the accept() call on a
7918 * TCP-style socket..
7922 /* Mark the new socket "in-use" by the user so that any packets
7923 * that may arrive on the association after we've moved it are
7924 * queued to the backlog. This prevents a potential race between
7925 * backlog processing on the old socket and new-packet processing
7926 * on the new socket.
7928 * The caller has just allocated newsk so we can guarantee that other
7929 * paths won't try to lock it and then oldsk.
7931 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
7932 sctp_assoc_migrate(assoc
, newsk
);
7934 /* If the association on the newsk is already closed before accept()
7935 * is called, set RCV_SHUTDOWN flag.
7937 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
)) {
7938 newsk
->sk_state
= SCTP_SS_CLOSED
;
7939 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
7941 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
7944 release_sock(newsk
);
7948 /* This proto struct describes the ULP interface for SCTP. */
7949 struct proto sctp_prot
= {
7951 .owner
= THIS_MODULE
,
7952 .close
= sctp_close
,
7953 .connect
= sctp_connect
,
7954 .disconnect
= sctp_disconnect
,
7955 .accept
= sctp_accept
,
7956 .ioctl
= sctp_ioctl
,
7957 .init
= sctp_init_sock
,
7958 .destroy
= sctp_destroy_sock
,
7959 .shutdown
= sctp_shutdown
,
7960 .setsockopt
= sctp_setsockopt
,
7961 .getsockopt
= sctp_getsockopt
,
7962 .sendmsg
= sctp_sendmsg
,
7963 .recvmsg
= sctp_recvmsg
,
7965 .backlog_rcv
= sctp_backlog_rcv
,
7967 .unhash
= sctp_unhash
,
7968 .get_port
= sctp_get_port
,
7969 .obj_size
= sizeof(struct sctp_sock
),
7970 .sysctl_mem
= sysctl_sctp_mem
,
7971 .sysctl_rmem
= sysctl_sctp_rmem
,
7972 .sysctl_wmem
= sysctl_sctp_wmem
,
7973 .memory_pressure
= &sctp_memory_pressure
,
7974 .enter_memory_pressure
= sctp_enter_memory_pressure
,
7975 .memory_allocated
= &sctp_memory_allocated
,
7976 .sockets_allocated
= &sctp_sockets_allocated
,
7979 #if IS_ENABLED(CONFIG_IPV6)
7981 #include <net/transp_v6.h>
7982 static void sctp_v6_destroy_sock(struct sock
*sk
)
7984 sctp_destroy_sock(sk
);
7985 inet6_destroy_sock(sk
);
7988 struct proto sctpv6_prot
= {
7990 .owner
= THIS_MODULE
,
7991 .close
= sctp_close
,
7992 .connect
= sctp_connect
,
7993 .disconnect
= sctp_disconnect
,
7994 .accept
= sctp_accept
,
7995 .ioctl
= sctp_ioctl
,
7996 .init
= sctp_init_sock
,
7997 .destroy
= sctp_v6_destroy_sock
,
7998 .shutdown
= sctp_shutdown
,
7999 .setsockopt
= sctp_setsockopt
,
8000 .getsockopt
= sctp_getsockopt
,
8001 .sendmsg
= sctp_sendmsg
,
8002 .recvmsg
= sctp_recvmsg
,
8004 .backlog_rcv
= sctp_backlog_rcv
,
8006 .unhash
= sctp_unhash
,
8007 .get_port
= sctp_get_port
,
8008 .obj_size
= sizeof(struct sctp6_sock
),
8009 .sysctl_mem
= sysctl_sctp_mem
,
8010 .sysctl_rmem
= sysctl_sctp_rmem
,
8011 .sysctl_wmem
= sysctl_sctp_wmem
,
8012 .memory_pressure
= &sctp_memory_pressure
,
8013 .enter_memory_pressure
= sctp_enter_memory_pressure
,
8014 .memory_allocated
= &sctp_memory_allocated
,
8015 .sockets_allocated
= &sctp_sockets_allocated
,
8017 #endif /* IS_ENABLED(CONFIG_IPV6) */