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>
60 #include <linux/sched/signal.h>
62 #include <linux/capability.h>
63 #include <linux/fcntl.h>
64 #include <linux/poll.h>
65 #include <linux/init.h>
66 #include <linux/slab.h>
67 #include <linux/file.h>
68 #include <linux/compat.h>
72 #include <net/route.h>
74 #include <net/inet_common.h>
75 #include <net/busy_poll.h>
77 #include <linux/socket.h> /* for sa_family_t */
78 #include <linux/export.h>
80 #include <net/sctp/sctp.h>
81 #include <net/sctp/sm.h>
83 /* Forward declarations for internal helper functions. */
84 static int sctp_writeable(struct sock
*sk
);
85 static void sctp_wfree(struct sk_buff
*skb
);
86 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
88 static int sctp_wait_for_packet(struct sock
*sk
, int *err
, long *timeo_p
);
89 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
90 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
91 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
92 static void sctp_destruct_sock(struct sock
*sk
);
93 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
94 union sctp_addr
*addr
, int len
);
95 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
96 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
97 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
98 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
99 static int sctp_send_asconf(struct sctp_association
*asoc
,
100 struct sctp_chunk
*chunk
);
101 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
102 static int sctp_autobind(struct sock
*sk
);
103 static void sctp_sock_migrate(struct sock
*, struct sock
*,
104 struct sctp_association
*, sctp_socket_type_t
);
106 static int sctp_memory_pressure
;
107 static atomic_long_t sctp_memory_allocated
;
108 struct percpu_counter sctp_sockets_allocated
;
110 static void sctp_enter_memory_pressure(struct sock
*sk
)
112 sctp_memory_pressure
= 1;
116 /* Get the sndbuf space available at the time on the association. */
117 static inline int sctp_wspace(struct sctp_association
*asoc
)
121 if (asoc
->ep
->sndbuf_policy
)
122 amt
= asoc
->sndbuf_used
;
124 amt
= sk_wmem_alloc_get(asoc
->base
.sk
);
126 if (amt
>= asoc
->base
.sk
->sk_sndbuf
) {
127 if (asoc
->base
.sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)
130 amt
= sk_stream_wspace(asoc
->base
.sk
);
135 amt
= asoc
->base
.sk
->sk_sndbuf
- amt
;
140 /* Increment the used sndbuf space count of the corresponding association by
141 * the size of the outgoing data chunk.
142 * Also, set the skb destructor for sndbuf accounting later.
144 * Since it is always 1-1 between chunk and skb, and also a new skb is always
145 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
146 * destructor in the data chunk skb for the purpose of the sndbuf space
149 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
151 struct sctp_association
*asoc
= chunk
->asoc
;
152 struct sock
*sk
= asoc
->base
.sk
;
154 /* The sndbuf space is tracked per association. */
155 sctp_association_hold(asoc
);
157 skb_set_owner_w(chunk
->skb
, sk
);
159 chunk
->skb
->destructor
= sctp_wfree
;
160 /* Save the chunk pointer in skb for sctp_wfree to use later. */
161 skb_shinfo(chunk
->skb
)->destructor_arg
= chunk
;
163 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
164 sizeof(struct sk_buff
) +
165 sizeof(struct sctp_chunk
);
167 atomic_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
168 sk
->sk_wmem_queued
+= chunk
->skb
->truesize
;
169 sk_mem_charge(sk
, chunk
->skb
->truesize
);
172 /* Verify that this is a valid address. */
173 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
178 /* Verify basic sockaddr. */
179 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
183 /* Is this a valid SCTP address? */
184 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
187 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
193 /* Look up the association by its id. If this is not a UDP-style
194 * socket, the ID field is always ignored.
196 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
198 struct sctp_association
*asoc
= NULL
;
200 /* If this is not a UDP-style socket, assoc id should be ignored. */
201 if (!sctp_style(sk
, UDP
)) {
202 /* Return NULL if the socket state is not ESTABLISHED. It
203 * could be a TCP-style listening socket or a socket which
204 * hasn't yet called connect() to establish an association.
206 if (!sctp_sstate(sk
, ESTABLISHED
) && !sctp_sstate(sk
, CLOSING
))
209 /* Get the first and the only association from the list. */
210 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
211 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
212 struct sctp_association
, asocs
);
216 /* Otherwise this is a UDP-style socket. */
217 if (!id
|| (id
== (sctp_assoc_t
)-1))
220 spin_lock_bh(&sctp_assocs_id_lock
);
221 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
222 spin_unlock_bh(&sctp_assocs_id_lock
);
224 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
230 /* Look up the transport from an address and an assoc id. If both address and
231 * id are specified, the associations matching the address and the id should be
234 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
235 struct sockaddr_storage
*addr
,
238 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
239 struct sctp_af
*af
= sctp_get_af_specific(addr
->ss_family
);
240 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
241 struct sctp_transport
*transport
;
243 if (!af
|| sctp_verify_addr(sk
, laddr
, af
->sockaddr_len
))
246 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
253 id_asoc
= sctp_id2assoc(sk
, id
);
254 if (id_asoc
&& (id_asoc
!= addr_asoc
))
257 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sctp_sk(sk
),
258 (union sctp_addr
*)addr
);
263 /* API 3.1.2 bind() - UDP Style Syntax
264 * The syntax of bind() is,
266 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
268 * sd - the socket descriptor returned by socket().
269 * addr - the address structure (struct sockaddr_in or struct
270 * sockaddr_in6 [RFC 2553]),
271 * addr_len - the size of the address structure.
273 static int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
279 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__
, sk
,
282 /* Disallow binding twice. */
283 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
284 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
294 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
296 /* Verify this is a valid sockaddr. */
297 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
298 union sctp_addr
*addr
, int len
)
302 /* Check minimum size. */
303 if (len
< sizeof (struct sockaddr
))
306 /* V4 mapped address are really of AF_INET family */
307 if (addr
->sa
.sa_family
== AF_INET6
&&
308 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
)) {
309 if (!opt
->pf
->af_supported(AF_INET
, opt
))
312 /* Does this PF support this AF? */
313 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
317 /* If we get this far, af is valid. */
318 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
320 if (len
< af
->sockaddr_len
)
326 /* Bind a local address either to an endpoint or to an association. */
327 static int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
329 struct net
*net
= sock_net(sk
);
330 struct sctp_sock
*sp
= sctp_sk(sk
);
331 struct sctp_endpoint
*ep
= sp
->ep
;
332 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
337 /* Common sockaddr verification. */
338 af
= sctp_sockaddr_af(sp
, addr
, len
);
340 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
341 __func__
, sk
, addr
, len
);
345 snum
= ntohs(addr
->v4
.sin_port
);
347 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
348 __func__
, sk
, &addr
->sa
, bp
->port
, snum
, len
);
350 /* PF specific bind() address verification. */
351 if (!sp
->pf
->bind_verify(sp
, addr
))
352 return -EADDRNOTAVAIL
;
354 /* We must either be unbound, or bind to the same port.
355 * It's OK to allow 0 ports if we are already bound.
356 * We'll just inhert an already bound port in this case
361 else if (snum
!= bp
->port
) {
362 pr_debug("%s: new port %d doesn't match existing port "
363 "%d\n", __func__
, snum
, bp
->port
);
368 if (snum
&& snum
< inet_prot_sock(net
) &&
369 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
))
372 /* See if the address matches any of the addresses we may have
373 * already bound before checking against other endpoints.
375 if (sctp_bind_addr_match(bp
, addr
, sp
))
378 /* Make sure we are allowed to bind here.
379 * The function sctp_get_port_local() does duplicate address
382 addr
->v4
.sin_port
= htons(snum
);
383 if ((ret
= sctp_get_port_local(sk
, addr
))) {
387 /* Refresh ephemeral port. */
389 bp
->port
= inet_sk(sk
)->inet_num
;
391 /* Add the address to the bind address list.
392 * Use GFP_ATOMIC since BHs will be disabled.
394 ret
= sctp_add_bind_addr(bp
, addr
, af
->sockaddr_len
,
395 SCTP_ADDR_SRC
, GFP_ATOMIC
);
397 /* Copy back into socket for getsockname() use. */
399 inet_sk(sk
)->inet_sport
= htons(inet_sk(sk
)->inet_num
);
400 sp
->pf
->to_sk_saddr(addr
, sk
);
406 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
408 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
409 * at any one time. If a sender, after sending an ASCONF chunk, decides
410 * it needs to transfer another ASCONF Chunk, it MUST wait until the
411 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
412 * subsequent ASCONF. Note this restriction binds each side, so at any
413 * time two ASCONF may be in-transit on any given association (one sent
414 * from each endpoint).
416 static int sctp_send_asconf(struct sctp_association
*asoc
,
417 struct sctp_chunk
*chunk
)
419 struct net
*net
= sock_net(asoc
->base
.sk
);
422 /* If there is an outstanding ASCONF chunk, queue it for later
425 if (asoc
->addip_last_asconf
) {
426 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
430 /* Hold the chunk until an ASCONF_ACK is received. */
431 sctp_chunk_hold(chunk
);
432 retval
= sctp_primitive_ASCONF(net
, asoc
, chunk
);
434 sctp_chunk_free(chunk
);
436 asoc
->addip_last_asconf
= chunk
;
442 /* Add a list of addresses as bind addresses to local endpoint or
445 * Basically run through each address specified in the addrs/addrcnt
446 * array/length pair, determine if it is IPv6 or IPv4 and call
447 * sctp_do_bind() on it.
449 * If any of them fails, then the operation will be reversed and the
450 * ones that were added will be removed.
452 * Only sctp_setsockopt_bindx() is supposed to call this function.
454 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
459 struct sockaddr
*sa_addr
;
462 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__
, sk
,
466 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
467 /* The list may contain either IPv4 or IPv6 address;
468 * determine the address length for walking thru the list.
471 af
= sctp_get_af_specific(sa_addr
->sa_family
);
477 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
480 addr_buf
+= af
->sockaddr_len
;
484 /* Failed. Cleanup the ones that have been added */
486 sctp_bindx_rem(sk
, addrs
, cnt
);
494 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
495 * associations that are part of the endpoint indicating that a list of local
496 * addresses are added to the endpoint.
498 * If any of the addresses is already in the bind address list of the
499 * association, we do not send the chunk for that association. But it will not
500 * affect other associations.
502 * Only sctp_setsockopt_bindx() is supposed to call this function.
504 static int sctp_send_asconf_add_ip(struct sock
*sk
,
505 struct sockaddr
*addrs
,
508 struct net
*net
= sock_net(sk
);
509 struct sctp_sock
*sp
;
510 struct sctp_endpoint
*ep
;
511 struct sctp_association
*asoc
;
512 struct sctp_bind_addr
*bp
;
513 struct sctp_chunk
*chunk
;
514 struct sctp_sockaddr_entry
*laddr
;
515 union sctp_addr
*addr
;
516 union sctp_addr saveaddr
;
523 if (!net
->sctp
.addip_enable
)
529 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
530 __func__
, sk
, addrs
, addrcnt
);
532 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
533 if (!asoc
->peer
.asconf_capable
)
536 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
539 if (!sctp_state(asoc
, ESTABLISHED
))
542 /* Check if any address in the packed array of addresses is
543 * in the bind address list of the association. If so,
544 * do not send the asconf chunk to its peer, but continue with
545 * other associations.
548 for (i
= 0; i
< addrcnt
; i
++) {
550 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
556 if (sctp_assoc_lookup_laddr(asoc
, addr
))
559 addr_buf
+= af
->sockaddr_len
;
564 /* Use the first valid address in bind addr list of
565 * association as Address Parameter of ASCONF CHUNK.
567 bp
= &asoc
->base
.bind_addr
;
568 p
= bp
->address_list
.next
;
569 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
570 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
571 addrcnt
, SCTP_PARAM_ADD_IP
);
577 /* Add the new addresses to the bind address list with
578 * use_as_src set to 0.
581 for (i
= 0; i
< addrcnt
; i
++) {
583 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
584 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
585 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
587 SCTP_ADDR_NEW
, GFP_ATOMIC
);
588 addr_buf
+= af
->sockaddr_len
;
590 if (asoc
->src_out_of_asoc_ok
) {
591 struct sctp_transport
*trans
;
593 list_for_each_entry(trans
,
594 &asoc
->peer
.transport_addr_list
, transports
) {
595 /* Clear the source and route cache */
596 sctp_transport_dst_release(trans
);
597 trans
->cwnd
= min(4*asoc
->pathmtu
, max_t(__u32
,
598 2*asoc
->pathmtu
, 4380));
599 trans
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
600 trans
->rto
= asoc
->rto_initial
;
601 sctp_max_rto(asoc
, trans
);
602 trans
->rtt
= trans
->srtt
= trans
->rttvar
= 0;
603 sctp_transport_route(trans
, NULL
,
604 sctp_sk(asoc
->base
.sk
));
607 retval
= sctp_send_asconf(asoc
, chunk
);
614 /* Remove a list of addresses from bind addresses list. Do not remove the
617 * Basically run through each address specified in the addrs/addrcnt
618 * array/length pair, determine if it is IPv6 or IPv4 and call
619 * sctp_del_bind() on it.
621 * If any of them fails, then the operation will be reversed and the
622 * ones that were removed will be added back.
624 * At least one address has to be left; if only one address is
625 * available, the operation will return -EBUSY.
627 * Only sctp_setsockopt_bindx() is supposed to call this function.
629 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
631 struct sctp_sock
*sp
= sctp_sk(sk
);
632 struct sctp_endpoint
*ep
= sp
->ep
;
634 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
637 union sctp_addr
*sa_addr
;
640 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
641 __func__
, sk
, addrs
, addrcnt
);
644 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
645 /* If the bind address list is empty or if there is only one
646 * bind address, there is nothing more to be removed (we need
647 * at least one address here).
649 if (list_empty(&bp
->address_list
) ||
650 (sctp_list_single_entry(&bp
->address_list
))) {
656 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
662 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
663 retval
= -EADDRNOTAVAIL
;
667 if (sa_addr
->v4
.sin_port
&&
668 sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
673 if (!sa_addr
->v4
.sin_port
)
674 sa_addr
->v4
.sin_port
= htons(bp
->port
);
676 /* FIXME - There is probably a need to check if sk->sk_saddr and
677 * sk->sk_rcv_addr are currently set to one of the addresses to
678 * be removed. This is something which needs to be looked into
679 * when we are fixing the outstanding issues with multi-homing
680 * socket routing and failover schemes. Refer to comments in
681 * sctp_do_bind(). -daisy
683 retval
= sctp_del_bind_addr(bp
, sa_addr
);
685 addr_buf
+= af
->sockaddr_len
;
688 /* Failed. Add the ones that has been removed back */
690 sctp_bindx_add(sk
, addrs
, cnt
);
698 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
699 * the associations that are part of the endpoint indicating that a list of
700 * local addresses are removed from the endpoint.
702 * If any of the addresses is already in the bind address list of the
703 * association, we do not send the chunk for that association. But it will not
704 * affect other associations.
706 * Only sctp_setsockopt_bindx() is supposed to call this function.
708 static int sctp_send_asconf_del_ip(struct sock
*sk
,
709 struct sockaddr
*addrs
,
712 struct net
*net
= sock_net(sk
);
713 struct sctp_sock
*sp
;
714 struct sctp_endpoint
*ep
;
715 struct sctp_association
*asoc
;
716 struct sctp_transport
*transport
;
717 struct sctp_bind_addr
*bp
;
718 struct sctp_chunk
*chunk
;
719 union sctp_addr
*laddr
;
722 struct sctp_sockaddr_entry
*saddr
;
728 if (!net
->sctp
.addip_enable
)
734 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
735 __func__
, sk
, addrs
, addrcnt
);
737 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
739 if (!asoc
->peer
.asconf_capable
)
742 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
745 if (!sctp_state(asoc
, ESTABLISHED
))
748 /* Check if any address in the packed array of addresses is
749 * not present in the bind address list of the association.
750 * If so, do not send the asconf chunk to its peer, but
751 * continue with other associations.
754 for (i
= 0; i
< addrcnt
; i
++) {
756 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
762 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
765 addr_buf
+= af
->sockaddr_len
;
770 /* Find one address in the association's bind address list
771 * that is not in the packed array of addresses. This is to
772 * make sure that we do not delete all the addresses in the
775 bp
= &asoc
->base
.bind_addr
;
776 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
778 if ((laddr
== NULL
) && (addrcnt
== 1)) {
779 if (asoc
->asconf_addr_del_pending
)
781 asoc
->asconf_addr_del_pending
=
782 kzalloc(sizeof(union sctp_addr
), GFP_ATOMIC
);
783 if (asoc
->asconf_addr_del_pending
== NULL
) {
787 asoc
->asconf_addr_del_pending
->sa
.sa_family
=
789 asoc
->asconf_addr_del_pending
->v4
.sin_port
=
791 if (addrs
->sa_family
== AF_INET
) {
792 struct sockaddr_in
*sin
;
794 sin
= (struct sockaddr_in
*)addrs
;
795 asoc
->asconf_addr_del_pending
->v4
.sin_addr
.s_addr
= sin
->sin_addr
.s_addr
;
796 } else if (addrs
->sa_family
== AF_INET6
) {
797 struct sockaddr_in6
*sin6
;
799 sin6
= (struct sockaddr_in6
*)addrs
;
800 asoc
->asconf_addr_del_pending
->v6
.sin6_addr
= sin6
->sin6_addr
;
803 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
804 __func__
, asoc
, &asoc
->asconf_addr_del_pending
->sa
,
805 asoc
->asconf_addr_del_pending
);
807 asoc
->src_out_of_asoc_ok
= 1;
815 /* We do not need RCU protection throughout this loop
816 * because this is done under a socket lock from the
819 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
827 /* Reset use_as_src flag for the addresses in the bind address
828 * list that are to be deleted.
831 for (i
= 0; i
< addrcnt
; i
++) {
833 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
834 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
835 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
836 saddr
->state
= SCTP_ADDR_DEL
;
838 addr_buf
+= af
->sockaddr_len
;
841 /* Update the route and saddr entries for all the transports
842 * as some of the addresses in the bind address list are
843 * about to be deleted and cannot be used as source addresses.
845 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
847 sctp_transport_dst_release(transport
);
848 sctp_transport_route(transport
, NULL
,
849 sctp_sk(asoc
->base
.sk
));
853 /* We don't need to transmit ASCONF */
855 retval
= sctp_send_asconf(asoc
, chunk
);
861 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
862 int sctp_asconf_mgmt(struct sctp_sock
*sp
, struct sctp_sockaddr_entry
*addrw
)
864 struct sock
*sk
= sctp_opt2sk(sp
);
865 union sctp_addr
*addr
;
868 /* It is safe to write port space in caller. */
870 addr
->v4
.sin_port
= htons(sp
->ep
->base
.bind_addr
.port
);
871 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
874 if (sctp_verify_addr(sk
, addr
, af
->sockaddr_len
))
877 if (addrw
->state
== SCTP_ADDR_NEW
)
878 return sctp_send_asconf_add_ip(sk
, (struct sockaddr
*)addr
, 1);
880 return sctp_send_asconf_del_ip(sk
, (struct sockaddr
*)addr
, 1);
883 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
886 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
889 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
890 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
893 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
894 * Section 3.1.2 for this usage.
896 * addrs is a pointer to an array of one or more socket addresses. Each
897 * address is contained in its appropriate structure (i.e. struct
898 * sockaddr_in or struct sockaddr_in6) the family of the address type
899 * must be used to distinguish the address length (note that this
900 * representation is termed a "packed array" of addresses). The caller
901 * specifies the number of addresses in the array with addrcnt.
903 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
904 * -1, and sets errno to the appropriate error code.
906 * For SCTP, the port given in each socket address must be the same, or
907 * sctp_bindx() will fail, setting errno to EINVAL.
909 * The flags parameter is formed from the bitwise OR of zero or more of
910 * the following currently defined flags:
912 * SCTP_BINDX_ADD_ADDR
914 * SCTP_BINDX_REM_ADDR
916 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
917 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
918 * addresses from the association. The two flags are mutually exclusive;
919 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
920 * not remove all addresses from an association; sctp_bindx() will
921 * reject such an attempt with EINVAL.
923 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
924 * additional addresses with an endpoint after calling bind(). Or use
925 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
926 * socket is associated with so that no new association accepted will be
927 * associated with those addresses. If the endpoint supports dynamic
928 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
929 * endpoint to send the appropriate message to the peer to change the
930 * peers address lists.
932 * Adding and removing addresses from a connected association is
933 * optional functionality. Implementations that do not support this
934 * functionality should return EOPNOTSUPP.
936 * Basically do nothing but copying the addresses from user to kernel
937 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
938 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
941 * We don't use copy_from_user() for optimization: we first do the
942 * sanity checks (buffer size -fast- and access check-healthy
943 * pointer); if all of those succeed, then we can alloc the memory
944 * (expensive operation) needed to copy the data to kernel. Then we do
945 * the copying without checking the user space area
946 * (__copy_from_user()).
948 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
951 * sk The sk of the socket
952 * addrs The pointer to the addresses in user land
953 * addrssize Size of the addrs buffer
954 * op Operation to perform (add or remove, see the flags of
957 * Returns 0 if ok, <0 errno code on error.
959 static int sctp_setsockopt_bindx(struct sock
*sk
,
960 struct sockaddr __user
*addrs
,
961 int addrs_size
, int op
)
963 struct sockaddr
*kaddrs
;
967 struct sockaddr
*sa_addr
;
971 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
972 __func__
, sk
, addrs
, addrs_size
, op
);
974 if (unlikely(addrs_size
<= 0))
977 /* Check the user passed a healthy pointer. */
978 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
981 /* Alloc space for the address array in kernel memory. */
982 kaddrs
= kmalloc(addrs_size
, GFP_USER
| __GFP_NOWARN
);
983 if (unlikely(!kaddrs
))
986 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
991 /* Walk through the addrs buffer and count the number of addresses. */
993 while (walk_size
< addrs_size
) {
994 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1000 af
= sctp_get_af_specific(sa_addr
->sa_family
);
1002 /* If the address family is not supported or if this address
1003 * causes the address buffer to overflow return EINVAL.
1005 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1010 addr_buf
+= af
->sockaddr_len
;
1011 walk_size
+= af
->sockaddr_len
;
1016 case SCTP_BINDX_ADD_ADDR
:
1017 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
1020 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
1023 case SCTP_BINDX_REM_ADDR
:
1024 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
1027 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
1041 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1043 * Common routine for handling connect() and sctp_connectx().
1044 * Connect will come in with just a single address.
1046 static int __sctp_connect(struct sock
*sk
,
1047 struct sockaddr
*kaddrs
,
1049 sctp_assoc_t
*assoc_id
)
1051 struct net
*net
= sock_net(sk
);
1052 struct sctp_sock
*sp
;
1053 struct sctp_endpoint
*ep
;
1054 struct sctp_association
*asoc
= NULL
;
1055 struct sctp_association
*asoc2
;
1056 struct sctp_transport
*transport
;
1063 union sctp_addr
*sa_addr
= NULL
;
1065 unsigned short port
;
1066 unsigned int f_flags
= 0;
1071 /* connect() cannot be done on a socket that is already in ESTABLISHED
1072 * state - UDP-style peeled off socket or a TCP-style socket that
1073 * is already connected.
1074 * It cannot be done even on a TCP-style listening socket.
1076 if (sctp_sstate(sk
, ESTABLISHED
) || sctp_sstate(sk
, CLOSING
) ||
1077 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
1082 /* Walk through the addrs buffer and count the number of addresses. */
1084 while (walk_size
< addrs_size
) {
1087 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1093 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1095 /* If the address family is not supported or if this address
1096 * causes the address buffer to overflow return EINVAL.
1098 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1103 port
= ntohs(sa_addr
->v4
.sin_port
);
1105 /* Save current address so we can work with it */
1106 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1108 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1112 /* Make sure the destination port is correctly set
1115 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
) {
1120 /* Check if there already is a matching association on the
1121 * endpoint (other than the one created here).
1123 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1124 if (asoc2
&& asoc2
!= asoc
) {
1125 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1132 /* If we could not find a matching association on the endpoint,
1133 * make sure that there is no peeled-off association matching
1134 * the peer address even on another socket.
1136 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1137 err
= -EADDRNOTAVAIL
;
1142 /* If a bind() or sctp_bindx() is not called prior to
1143 * an sctp_connectx() call, the system picks an
1144 * ephemeral port and will choose an address set
1145 * equivalent to binding with a wildcard address.
1147 if (!ep
->base
.bind_addr
.port
) {
1148 if (sctp_autobind(sk
)) {
1154 * If an unprivileged user inherits a 1-many
1155 * style socket with open associations on a
1156 * privileged port, it MAY be permitted to
1157 * accept new associations, but it SHOULD NOT
1158 * be permitted to open new associations.
1160 if (ep
->base
.bind_addr
.port
<
1161 inet_prot_sock(net
) &&
1162 !ns_capable(net
->user_ns
,
1163 CAP_NET_BIND_SERVICE
)) {
1169 scope
= sctp_scope(&to
);
1170 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1176 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
,
1184 /* Prime the peer's transport structures. */
1185 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1193 addr_buf
+= af
->sockaddr_len
;
1194 walk_size
+= af
->sockaddr_len
;
1197 /* In case the user of sctp_connectx() wants an association
1198 * id back, assign one now.
1201 err
= sctp_assoc_set_id(asoc
, GFP_KERNEL
);
1206 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1211 /* Initialize sk's dport and daddr for getpeername() */
1212 inet_sk(sk
)->inet_dport
= htons(asoc
->peer
.port
);
1213 sp
->pf
->to_sk_daddr(sa_addr
, sk
);
1216 /* in-kernel sockets don't generally have a file allocated to them
1217 * if all they do is call sock_create_kern().
1219 if (sk
->sk_socket
->file
)
1220 f_flags
= sk
->sk_socket
->file
->f_flags
;
1222 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1225 *assoc_id
= asoc
->assoc_id
;
1226 err
= sctp_wait_for_connect(asoc
, &timeo
);
1227 /* Note: the asoc may be freed after the return of
1228 * sctp_wait_for_connect.
1231 /* Don't free association on exit. */
1235 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1236 __func__
, asoc
, kaddrs
, err
);
1239 /* sctp_primitive_ASSOCIATE may have added this association
1240 * To the hash table, try to unhash it, just in case, its a noop
1241 * if it wasn't hashed so we're safe
1243 sctp_association_free(asoc
);
1248 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1251 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1252 * sctp_assoc_t *asoc);
1254 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1255 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1256 * or IPv6 addresses.
1258 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1259 * Section 3.1.2 for this usage.
1261 * addrs is a pointer to an array of one or more socket addresses. Each
1262 * address is contained in its appropriate structure (i.e. struct
1263 * sockaddr_in or struct sockaddr_in6) the family of the address type
1264 * must be used to distengish the address length (note that this
1265 * representation is termed a "packed array" of addresses). The caller
1266 * specifies the number of addresses in the array with addrcnt.
1268 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1269 * the association id of the new association. On failure, sctp_connectx()
1270 * returns -1, and sets errno to the appropriate error code. The assoc_id
1271 * is not touched by the kernel.
1273 * For SCTP, the port given in each socket address must be the same, or
1274 * sctp_connectx() will fail, setting errno to EINVAL.
1276 * An application can use sctp_connectx to initiate an association with
1277 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1278 * allows a caller to specify multiple addresses at which a peer can be
1279 * reached. The way the SCTP stack uses the list of addresses to set up
1280 * the association is implementation dependent. This function only
1281 * specifies that the stack will try to make use of all the addresses in
1282 * the list when needed.
1284 * Note that the list of addresses passed in is only used for setting up
1285 * the association. It does not necessarily equal the set of addresses
1286 * the peer uses for the resulting association. If the caller wants to
1287 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1288 * retrieve them after the association has been set up.
1290 * Basically do nothing but copying the addresses from user to kernel
1291 * land and invoking either sctp_connectx(). This is used for tunneling
1292 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1294 * We don't use copy_from_user() for optimization: we first do the
1295 * sanity checks (buffer size -fast- and access check-healthy
1296 * pointer); if all of those succeed, then we can alloc the memory
1297 * (expensive operation) needed to copy the data to kernel. Then we do
1298 * the copying without checking the user space area
1299 * (__copy_from_user()).
1301 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1304 * sk The sk of the socket
1305 * addrs The pointer to the addresses in user land
1306 * addrssize Size of the addrs buffer
1308 * Returns >=0 if ok, <0 errno code on error.
1310 static int __sctp_setsockopt_connectx(struct sock
*sk
,
1311 struct sockaddr __user
*addrs
,
1313 sctp_assoc_t
*assoc_id
)
1315 struct sockaddr
*kaddrs
;
1316 gfp_t gfp
= GFP_KERNEL
;
1319 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1320 __func__
, sk
, addrs
, addrs_size
);
1322 if (unlikely(addrs_size
<= 0))
1325 /* Check the user passed a healthy pointer. */
1326 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1329 /* Alloc space for the address array in kernel memory. */
1330 if (sk
->sk_socket
->file
)
1331 gfp
= GFP_USER
| __GFP_NOWARN
;
1332 kaddrs
= kmalloc(addrs_size
, gfp
);
1333 if (unlikely(!kaddrs
))
1336 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1339 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, assoc_id
);
1348 * This is an older interface. It's kept for backward compatibility
1349 * to the option that doesn't provide association id.
1351 static int sctp_setsockopt_connectx_old(struct sock
*sk
,
1352 struct sockaddr __user
*addrs
,
1355 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1359 * New interface for the API. The since the API is done with a socket
1360 * option, to make it simple we feed back the association id is as a return
1361 * indication to the call. Error is always negative and association id is
1364 static int sctp_setsockopt_connectx(struct sock
*sk
,
1365 struct sockaddr __user
*addrs
,
1368 sctp_assoc_t assoc_id
= 0;
1371 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1380 * New (hopefully final) interface for the API.
1381 * We use the sctp_getaddrs_old structure so that use-space library
1382 * can avoid any unnecessary allocations. The only different part
1383 * is that we store the actual length of the address buffer into the
1384 * addrs_num structure member. That way we can re-use the existing
1387 #ifdef CONFIG_COMPAT
1388 struct compat_sctp_getaddrs_old
{
1389 sctp_assoc_t assoc_id
;
1391 compat_uptr_t addrs
; /* struct sockaddr * */
1395 static int sctp_getsockopt_connectx3(struct sock
*sk
, int len
,
1396 char __user
*optval
,
1399 struct sctp_getaddrs_old param
;
1400 sctp_assoc_t assoc_id
= 0;
1403 #ifdef CONFIG_COMPAT
1404 if (in_compat_syscall()) {
1405 struct compat_sctp_getaddrs_old param32
;
1407 if (len
< sizeof(param32
))
1409 if (copy_from_user(¶m32
, optval
, sizeof(param32
)))
1412 param
.assoc_id
= param32
.assoc_id
;
1413 param
.addr_num
= param32
.addr_num
;
1414 param
.addrs
= compat_ptr(param32
.addrs
);
1418 if (len
< sizeof(param
))
1420 if (copy_from_user(¶m
, optval
, sizeof(param
)))
1424 err
= __sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)
1425 param
.addrs
, param
.addr_num
,
1427 if (err
== 0 || err
== -EINPROGRESS
) {
1428 if (copy_to_user(optval
, &assoc_id
, sizeof(assoc_id
)))
1430 if (put_user(sizeof(assoc_id
), optlen
))
1437 /* API 3.1.4 close() - UDP Style Syntax
1438 * Applications use close() to perform graceful shutdown (as described in
1439 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1440 * by a UDP-style socket.
1444 * ret = close(int sd);
1446 * sd - the socket descriptor of the associations to be closed.
1448 * To gracefully shutdown a specific association represented by the
1449 * UDP-style socket, an application should use the sendmsg() call,
1450 * passing no user data, but including the appropriate flag in the
1451 * ancillary data (see Section xxxx).
1453 * If sd in the close() call is a branched-off socket representing only
1454 * one association, the shutdown is performed on that association only.
1456 * 4.1.6 close() - TCP Style Syntax
1458 * Applications use close() to gracefully close down an association.
1462 * int close(int sd);
1464 * sd - the socket descriptor of the association to be closed.
1466 * After an application calls close() on a socket descriptor, no further
1467 * socket operations will succeed on that descriptor.
1469 * API 7.1.4 SO_LINGER
1471 * An application using the TCP-style socket can use this option to
1472 * perform the SCTP ABORT primitive. The linger option structure is:
1475 * int l_onoff; // option on/off
1476 * int l_linger; // linger time
1479 * To enable the option, set l_onoff to 1. If the l_linger value is set
1480 * to 0, calling close() is the same as the ABORT primitive. If the
1481 * value is set to a negative value, the setsockopt() call will return
1482 * an error. If the value is set to a positive value linger_time, the
1483 * close() can be blocked for at most linger_time ms. If the graceful
1484 * shutdown phase does not finish during this period, close() will
1485 * return but the graceful shutdown phase continues in the system.
1487 static void sctp_close(struct sock
*sk
, long timeout
)
1489 struct net
*net
= sock_net(sk
);
1490 struct sctp_endpoint
*ep
;
1491 struct sctp_association
*asoc
;
1492 struct list_head
*pos
, *temp
;
1493 unsigned int data_was_unread
;
1495 pr_debug("%s: sk:%p, timeout:%ld\n", __func__
, sk
, timeout
);
1498 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1499 sk
->sk_state
= SCTP_SS_CLOSING
;
1501 ep
= sctp_sk(sk
)->ep
;
1503 /* Clean up any skbs sitting on the receive queue. */
1504 data_was_unread
= sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1505 data_was_unread
+= sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1507 /* Walk all associations on an endpoint. */
1508 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1509 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1511 if (sctp_style(sk
, TCP
)) {
1512 /* A closed association can still be in the list if
1513 * it belongs to a TCP-style listening socket that is
1514 * not yet accepted. If so, free it. If not, send an
1515 * ABORT or SHUTDOWN based on the linger options.
1517 if (sctp_state(asoc
, CLOSED
)) {
1518 sctp_association_free(asoc
);
1523 if (data_was_unread
|| !skb_queue_empty(&asoc
->ulpq
.lobby
) ||
1524 !skb_queue_empty(&asoc
->ulpq
.reasm
) ||
1525 (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
)) {
1526 struct sctp_chunk
*chunk
;
1528 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1529 sctp_primitive_ABORT(net
, asoc
, chunk
);
1531 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1534 /* On a TCP-style socket, block for at most linger_time if set. */
1535 if (sctp_style(sk
, TCP
) && timeout
)
1536 sctp_wait_for_close(sk
, timeout
);
1538 /* This will run the backlog queue. */
1541 /* Supposedly, no process has access to the socket, but
1542 * the net layers still may.
1543 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1544 * held and that should be grabbed before socket lock.
1546 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
1549 /* Hold the sock, since sk_common_release() will put sock_put()
1550 * and we have just a little more cleanup.
1553 sk_common_release(sk
);
1556 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
1560 SCTP_DBG_OBJCNT_DEC(sock
);
1563 /* Handle EPIPE error. */
1564 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1567 err
= sock_error(sk
) ? : -EPIPE
;
1568 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1569 send_sig(SIGPIPE
, current
, 0);
1573 /* API 3.1.3 sendmsg() - UDP Style Syntax
1575 * An application uses sendmsg() and recvmsg() calls to transmit data to
1576 * and receive data from its peer.
1578 * ssize_t sendmsg(int socket, const struct msghdr *message,
1581 * socket - the socket descriptor of the endpoint.
1582 * message - pointer to the msghdr structure which contains a single
1583 * user message and possibly some ancillary data.
1585 * See Section 5 for complete description of the data
1588 * flags - flags sent or received with the user message, see Section
1589 * 5 for complete description of the flags.
1591 * Note: This function could use a rewrite especially when explicit
1592 * connect support comes in.
1594 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1596 static int sctp_msghdr_parse(const struct msghdr
*, sctp_cmsgs_t
*);
1598 static int sctp_sendmsg(struct sock
*sk
, struct msghdr
*msg
, size_t msg_len
)
1600 struct net
*net
= sock_net(sk
);
1601 struct sctp_sock
*sp
;
1602 struct sctp_endpoint
*ep
;
1603 struct sctp_association
*new_asoc
= NULL
, *asoc
= NULL
;
1604 struct sctp_transport
*transport
, *chunk_tp
;
1605 struct sctp_chunk
*chunk
;
1607 struct sockaddr
*msg_name
= NULL
;
1608 struct sctp_sndrcvinfo default_sinfo
;
1609 struct sctp_sndrcvinfo
*sinfo
;
1610 struct sctp_initmsg
*sinit
;
1611 sctp_assoc_t associd
= 0;
1612 sctp_cmsgs_t cmsgs
= { NULL
};
1614 bool fill_sinfo_ttl
= false, wait_connect
= false;
1615 struct sctp_datamsg
*datamsg
;
1616 int msg_flags
= msg
->msg_flags
;
1617 __u16 sinfo_flags
= 0;
1625 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__
, sk
,
1628 /* We cannot send a message over a TCP-style listening socket. */
1629 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1634 /* Parse out the SCTP CMSGs. */
1635 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1637 pr_debug("%s: msghdr parse err:%x\n", __func__
, err
);
1641 /* Fetch the destination address for this packet. This
1642 * address only selects the association--it is not necessarily
1643 * the address we will send to.
1644 * For a peeled-off socket, msg_name is ignored.
1646 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1647 int msg_namelen
= msg
->msg_namelen
;
1649 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1654 if (msg_namelen
> sizeof(to
))
1655 msg_namelen
= sizeof(to
);
1656 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1657 msg_name
= msg
->msg_name
;
1661 if (cmsgs
.sinfo
!= NULL
) {
1662 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1663 default_sinfo
.sinfo_stream
= cmsgs
.sinfo
->snd_sid
;
1664 default_sinfo
.sinfo_flags
= cmsgs
.sinfo
->snd_flags
;
1665 default_sinfo
.sinfo_ppid
= cmsgs
.sinfo
->snd_ppid
;
1666 default_sinfo
.sinfo_context
= cmsgs
.sinfo
->snd_context
;
1667 default_sinfo
.sinfo_assoc_id
= cmsgs
.sinfo
->snd_assoc_id
;
1669 sinfo
= &default_sinfo
;
1670 fill_sinfo_ttl
= true;
1672 sinfo
= cmsgs
.srinfo
;
1674 /* Did the user specify SNDINFO/SNDRCVINFO? */
1676 sinfo_flags
= sinfo
->sinfo_flags
;
1677 associd
= sinfo
->sinfo_assoc_id
;
1680 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__
,
1681 msg_len
, sinfo_flags
);
1683 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1684 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1689 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1690 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1691 * If SCTP_ABORT is set, the message length could be non zero with
1692 * the msg_iov set to the user abort reason.
1694 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1695 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1700 /* If SCTP_ADDR_OVER is set, there must be an address
1701 * specified in msg_name.
1703 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1710 pr_debug("%s: about to look up association\n", __func__
);
1714 /* If a msg_name has been specified, assume this is to be used. */
1716 /* Look for a matching association on the endpoint. */
1717 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1719 /* If we could not find a matching association on the
1720 * endpoint, make sure that it is not a TCP-style
1721 * socket that already has an association or there is
1722 * no peeled-off association on another socket.
1725 ((sctp_style(sk
, TCP
) &&
1726 (sctp_sstate(sk
, ESTABLISHED
) ||
1727 sctp_sstate(sk
, CLOSING
))) ||
1728 sctp_endpoint_is_peeled_off(ep
, &to
))) {
1729 err
= -EADDRNOTAVAIL
;
1733 asoc
= sctp_id2assoc(sk
, associd
);
1741 pr_debug("%s: just looked up association:%p\n", __func__
, asoc
);
1743 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1744 * socket that has an association in CLOSED state. This can
1745 * happen when an accepted socket has an association that is
1748 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1753 if (sinfo_flags
& SCTP_EOF
) {
1754 pr_debug("%s: shutting down association:%p\n",
1757 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1761 if (sinfo_flags
& SCTP_ABORT
) {
1763 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1769 pr_debug("%s: aborting association:%p\n",
1772 sctp_primitive_ABORT(net
, asoc
, chunk
);
1778 /* Do we need to create the association? */
1780 pr_debug("%s: there is no association yet\n", __func__
);
1782 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1787 /* Check for invalid stream against the stream counts,
1788 * either the default or the user specified stream counts.
1791 if (!sinit
|| !sinit
->sinit_num_ostreams
) {
1792 /* Check against the defaults. */
1793 if (sinfo
->sinfo_stream
>=
1794 sp
->initmsg
.sinit_num_ostreams
) {
1799 /* Check against the requested. */
1800 if (sinfo
->sinfo_stream
>=
1801 sinit
->sinit_num_ostreams
) {
1809 * API 3.1.2 bind() - UDP Style Syntax
1810 * If a bind() or sctp_bindx() is not called prior to a
1811 * sendmsg() call that initiates a new association, the
1812 * system picks an ephemeral port and will choose an address
1813 * set equivalent to binding with a wildcard address.
1815 if (!ep
->base
.bind_addr
.port
) {
1816 if (sctp_autobind(sk
)) {
1822 * If an unprivileged user inherits a one-to-many
1823 * style socket with open associations on a privileged
1824 * port, it MAY be permitted to accept new associations,
1825 * but it SHOULD NOT be permitted to open new
1828 if (ep
->base
.bind_addr
.port
< inet_prot_sock(net
) &&
1829 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
)) {
1835 scope
= sctp_scope(&to
);
1836 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1842 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
, GFP_KERNEL
);
1848 /* If the SCTP_INIT ancillary data is specified, set all
1849 * the association init values accordingly.
1852 if (sinit
->sinit_num_ostreams
) {
1853 asoc
->c
.sinit_num_ostreams
=
1854 sinit
->sinit_num_ostreams
;
1856 if (sinit
->sinit_max_instreams
) {
1857 asoc
->c
.sinit_max_instreams
=
1858 sinit
->sinit_max_instreams
;
1860 if (sinit
->sinit_max_attempts
) {
1861 asoc
->max_init_attempts
1862 = sinit
->sinit_max_attempts
;
1864 if (sinit
->sinit_max_init_timeo
) {
1865 asoc
->max_init_timeo
=
1866 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1870 /* Prime the peer's transport structures. */
1871 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1878 /* ASSERT: we have a valid association at this point. */
1879 pr_debug("%s: we have a valid association\n", __func__
);
1882 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1883 * one with some defaults.
1885 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1886 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1887 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1888 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1889 default_sinfo
.sinfo_context
= asoc
->default_context
;
1890 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1891 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1893 sinfo
= &default_sinfo
;
1894 } else if (fill_sinfo_ttl
) {
1895 /* In case SNDINFO was specified, we still need to fill
1896 * it with a default ttl from the assoc here.
1898 sinfo
->sinfo_timetolive
= asoc
->default_timetolive
;
1901 /* API 7.1.7, the sndbuf size per association bounds the
1902 * maximum size of data that can be sent in a single send call.
1904 if (msg_len
> sk
->sk_sndbuf
) {
1909 if (asoc
->pmtu_pending
)
1910 sctp_assoc_pending_pmtu(asoc
);
1912 /* If fragmentation is disabled and the message length exceeds the
1913 * association fragmentation point, return EMSGSIZE. The I-D
1914 * does not specify what this error is, but this looks like
1917 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1922 /* Check for invalid stream. */
1923 if (sinfo
->sinfo_stream
>= asoc
->stream
->outcnt
) {
1928 if (sctp_wspace(asoc
) < msg_len
)
1929 sctp_prsctp_prune(asoc
, sinfo
, msg_len
- sctp_wspace(asoc
));
1931 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1932 if (!sctp_wspace(asoc
)) {
1933 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1938 /* If an address is passed with the sendto/sendmsg call, it is used
1939 * to override the primary destination address in the TCP model, or
1940 * when SCTP_ADDR_OVER flag is set in the UDP model.
1942 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1943 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1944 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1952 /* Auto-connect, if we aren't connected already. */
1953 if (sctp_state(asoc
, CLOSED
)) {
1954 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1958 wait_connect
= true;
1959 pr_debug("%s: we associated primitively\n", __func__
);
1962 /* Break the message into multiple chunks of maximum size. */
1963 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, &msg
->msg_iter
);
1964 if (IS_ERR(datamsg
)) {
1965 err
= PTR_ERR(datamsg
);
1968 asoc
->force_delay
= !!(msg
->msg_flags
& MSG_MORE
);
1970 /* Now send the (possibly) fragmented message. */
1971 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1972 sctp_chunk_hold(chunk
);
1974 /* Do accounting for the write space. */
1975 sctp_set_owner_w(chunk
);
1977 chunk
->transport
= chunk_tp
;
1980 /* Send it to the lower layers. Note: all chunks
1981 * must either fail or succeed. The lower layer
1982 * works that way today. Keep it that way or this
1985 err
= sctp_primitive_SEND(net
, asoc
, datamsg
);
1986 /* Did the lower layer accept the chunk? */
1988 sctp_datamsg_free(datamsg
);
1992 pr_debug("%s: we sent primitively\n", __func__
);
1994 sctp_datamsg_put(datamsg
);
1997 if (unlikely(wait_connect
)) {
1998 timeo
= sock_sndtimeo(sk
, msg_flags
& MSG_DONTWAIT
);
1999 sctp_wait_for_connect(asoc
, &timeo
);
2002 /* If we are already past ASSOCIATE, the lower
2003 * layers are responsible for association cleanup.
2009 sctp_association_free(asoc
);
2014 return sctp_error(sk
, msg_flags
, err
);
2021 err
= sock_error(sk
);
2031 /* This is an extended version of skb_pull() that removes the data from the
2032 * start of a skb even when data is spread across the list of skb's in the
2033 * frag_list. len specifies the total amount of data that needs to be removed.
2034 * when 'len' bytes could be removed from the skb, it returns 0.
2035 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2036 * could not be removed.
2038 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
2040 struct sk_buff
*list
;
2041 int skb_len
= skb_headlen(skb
);
2044 if (len
<= skb_len
) {
2045 __skb_pull(skb
, len
);
2049 __skb_pull(skb
, skb_len
);
2051 skb_walk_frags(skb
, list
) {
2052 rlen
= sctp_skb_pull(list
, len
);
2053 skb
->len
-= (len
-rlen
);
2054 skb
->data_len
-= (len
-rlen
);
2065 /* API 3.1.3 recvmsg() - UDP Style Syntax
2067 * ssize_t recvmsg(int socket, struct msghdr *message,
2070 * socket - the socket descriptor of the endpoint.
2071 * message - pointer to the msghdr structure which contains a single
2072 * user message and possibly some ancillary data.
2074 * See Section 5 for complete description of the data
2077 * flags - flags sent or received with the user message, see Section
2078 * 5 for complete description of the flags.
2080 static int sctp_recvmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
,
2081 int noblock
, int flags
, int *addr_len
)
2083 struct sctp_ulpevent
*event
= NULL
;
2084 struct sctp_sock
*sp
= sctp_sk(sk
);
2085 struct sk_buff
*skb
, *head_skb
;
2090 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2091 "addr_len:%p)\n", __func__
, sk
, msg
, len
, noblock
, flags
,
2096 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
) &&
2097 !sctp_sstate(sk
, CLOSING
) && !sctp_sstate(sk
, CLOSED
)) {
2102 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
2106 /* Get the total length of the skb including any skb's in the
2115 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
2117 event
= sctp_skb2event(skb
);
2122 if (event
->chunk
&& event
->chunk
->head_skb
)
2123 head_skb
= event
->chunk
->head_skb
;
2126 sock_recv_ts_and_drops(msg
, sk
, head_skb
);
2127 if (sctp_ulpevent_is_notification(event
)) {
2128 msg
->msg_flags
|= MSG_NOTIFICATION
;
2129 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
2131 sp
->pf
->skb_msgname(head_skb
, msg
->msg_name
, addr_len
);
2134 /* Check if we allow SCTP_NXTINFO. */
2135 if (sp
->recvnxtinfo
)
2136 sctp_ulpevent_read_nxtinfo(event
, msg
, sk
);
2137 /* Check if we allow SCTP_RCVINFO. */
2138 if (sp
->recvrcvinfo
)
2139 sctp_ulpevent_read_rcvinfo(event
, msg
);
2140 /* Check if we allow SCTP_SNDRCVINFO. */
2141 if (sp
->subscribe
.sctp_data_io_event
)
2142 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
2146 /* If skb's length exceeds the user's buffer, update the skb and
2147 * push it back to the receive_queue so that the next call to
2148 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2150 if (skb_len
> copied
) {
2151 msg
->msg_flags
&= ~MSG_EOR
;
2152 if (flags
& MSG_PEEK
)
2154 sctp_skb_pull(skb
, copied
);
2155 skb_queue_head(&sk
->sk_receive_queue
, skb
);
2157 /* When only partial message is copied to the user, increase
2158 * rwnd by that amount. If all the data in the skb is read,
2159 * rwnd is updated when the event is freed.
2161 if (!sctp_ulpevent_is_notification(event
))
2162 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
2164 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
2165 (event
->msg_flags
& MSG_EOR
))
2166 msg
->msg_flags
|= MSG_EOR
;
2168 msg
->msg_flags
&= ~MSG_EOR
;
2171 if (flags
& MSG_PEEK
) {
2172 /* Release the skb reference acquired after peeking the skb in
2173 * sctp_skb_recv_datagram().
2177 /* Free the event which includes releasing the reference to
2178 * the owner of the skb, freeing the skb and updating the
2181 sctp_ulpevent_free(event
);
2188 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2190 * This option is a on/off flag. If enabled no SCTP message
2191 * fragmentation will be performed. Instead if a message being sent
2192 * exceeds the current PMTU size, the message will NOT be sent and
2193 * instead a error will be indicated to the user.
2195 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
2196 char __user
*optval
,
2197 unsigned int optlen
)
2201 if (optlen
< sizeof(int))
2204 if (get_user(val
, (int __user
*)optval
))
2207 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
2212 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2213 unsigned int optlen
)
2215 struct sctp_association
*asoc
;
2216 struct sctp_ulpevent
*event
;
2218 if (optlen
> sizeof(struct sctp_event_subscribe
))
2220 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2223 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2224 * if there is no data to be sent or retransmit, the stack will
2225 * immediately send up this notification.
2227 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT
,
2228 &sctp_sk(sk
)->subscribe
)) {
2229 asoc
= sctp_id2assoc(sk
, 0);
2231 if (asoc
&& sctp_outq_is_empty(&asoc
->outqueue
)) {
2232 event
= sctp_ulpevent_make_sender_dry_event(asoc
,
2237 sctp_ulpq_tail_event(&asoc
->ulpq
, event
);
2244 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2246 * This socket option is applicable to the UDP-style socket only. When
2247 * set it will cause associations that are idle for more than the
2248 * specified number of seconds to automatically close. An association
2249 * being idle is defined an association that has NOT sent or received
2250 * user data. The special value of '0' indicates that no automatic
2251 * close of any associations should be performed. The option expects an
2252 * integer defining the number of seconds of idle time before an
2253 * association is closed.
2255 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2256 unsigned int optlen
)
2258 struct sctp_sock
*sp
= sctp_sk(sk
);
2259 struct net
*net
= sock_net(sk
);
2261 /* Applicable to UDP-style socket only */
2262 if (sctp_style(sk
, TCP
))
2264 if (optlen
!= sizeof(int))
2266 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2269 if (sp
->autoclose
> net
->sctp
.max_autoclose
)
2270 sp
->autoclose
= net
->sctp
.max_autoclose
;
2275 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2277 * Applications can enable or disable heartbeats for any peer address of
2278 * an association, modify an address's heartbeat interval, force a
2279 * heartbeat to be sent immediately, and adjust the address's maximum
2280 * number of retransmissions sent before an address is considered
2281 * unreachable. The following structure is used to access and modify an
2282 * address's parameters:
2284 * struct sctp_paddrparams {
2285 * sctp_assoc_t spp_assoc_id;
2286 * struct sockaddr_storage spp_address;
2287 * uint32_t spp_hbinterval;
2288 * uint16_t spp_pathmaxrxt;
2289 * uint32_t spp_pathmtu;
2290 * uint32_t spp_sackdelay;
2291 * uint32_t spp_flags;
2294 * spp_assoc_id - (one-to-many style socket) This is filled in the
2295 * application, and identifies the association for
2297 * spp_address - This specifies which address is of interest.
2298 * spp_hbinterval - This contains the value of the heartbeat interval,
2299 * in milliseconds. If a value of zero
2300 * is present in this field then no changes are to
2301 * be made to this parameter.
2302 * spp_pathmaxrxt - This contains the maximum number of
2303 * retransmissions before this address shall be
2304 * considered unreachable. If a value of zero
2305 * is present in this field then no changes are to
2306 * be made to this parameter.
2307 * spp_pathmtu - When Path MTU discovery is disabled the value
2308 * specified here will be the "fixed" path mtu.
2309 * Note that if the spp_address field is empty
2310 * then all associations on this address will
2311 * have this fixed path mtu set upon them.
2313 * spp_sackdelay - When delayed sack is enabled, this value specifies
2314 * the number of milliseconds that sacks will be delayed
2315 * for. This value will apply to all addresses of an
2316 * association if the spp_address field is empty. Note
2317 * also, that if delayed sack is enabled and this
2318 * value is set to 0, no change is made to the last
2319 * recorded delayed sack timer value.
2321 * spp_flags - These flags are used to control various features
2322 * on an association. The flag field may contain
2323 * zero or more of the following options.
2325 * SPP_HB_ENABLE - Enable heartbeats on the
2326 * specified address. Note that if the address
2327 * field is empty all addresses for the association
2328 * have heartbeats enabled upon them.
2330 * SPP_HB_DISABLE - Disable heartbeats on the
2331 * speicifed address. Note that if the address
2332 * field is empty all addresses for the association
2333 * will have their heartbeats disabled. Note also
2334 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2335 * mutually exclusive, only one of these two should
2336 * be specified. Enabling both fields will have
2337 * undetermined results.
2339 * SPP_HB_DEMAND - Request a user initiated heartbeat
2340 * to be made immediately.
2342 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2343 * heartbeat delayis to be set to the value of 0
2346 * SPP_PMTUD_ENABLE - This field will enable PMTU
2347 * discovery upon the specified address. Note that
2348 * if the address feild is empty then all addresses
2349 * on the association are effected.
2351 * SPP_PMTUD_DISABLE - This field will disable PMTU
2352 * discovery upon the specified address. Note that
2353 * if the address feild is empty then all addresses
2354 * on the association are effected. Not also that
2355 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2356 * exclusive. Enabling both will have undetermined
2359 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2360 * on delayed sack. The time specified in spp_sackdelay
2361 * is used to specify the sack delay for this address. Note
2362 * that if spp_address is empty then all addresses will
2363 * enable delayed sack and take on the sack delay
2364 * value specified in spp_sackdelay.
2365 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2366 * off delayed sack. If the spp_address field is blank then
2367 * delayed sack is disabled for the entire association. Note
2368 * also that this field is mutually exclusive to
2369 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2372 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2373 struct sctp_transport
*trans
,
2374 struct sctp_association
*asoc
,
2375 struct sctp_sock
*sp
,
2378 int sackdelay_change
)
2382 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2383 struct net
*net
= sock_net(trans
->asoc
->base
.sk
);
2385 error
= sctp_primitive_REQUESTHEARTBEAT(net
, trans
->asoc
, trans
);
2390 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2391 * this field is ignored. Note also that a value of zero indicates
2392 * the current setting should be left unchanged.
2394 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2396 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2397 * set. This lets us use 0 value when this flag
2400 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2401 params
->spp_hbinterval
= 0;
2403 if (params
->spp_hbinterval
||
2404 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2407 msecs_to_jiffies(params
->spp_hbinterval
);
2410 msecs_to_jiffies(params
->spp_hbinterval
);
2412 sp
->hbinterval
= params
->spp_hbinterval
;
2419 trans
->param_flags
=
2420 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2423 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2426 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2430 /* When Path MTU discovery is disabled the value specified here will
2431 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2432 * include the flag SPP_PMTUD_DISABLE for this field to have any
2435 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2437 trans
->pathmtu
= params
->spp_pathmtu
;
2438 sctp_assoc_sync_pmtu(asoc
);
2440 asoc
->pathmtu
= params
->spp_pathmtu
;
2442 sp
->pathmtu
= params
->spp_pathmtu
;
2448 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2449 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2450 trans
->param_flags
=
2451 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2453 sctp_transport_pmtu(trans
, sctp_opt2sk(sp
));
2454 sctp_assoc_sync_pmtu(asoc
);
2458 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2461 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2465 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2466 * value of this field is ignored. Note also that a value of zero
2467 * indicates the current setting should be left unchanged.
2469 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2472 msecs_to_jiffies(params
->spp_sackdelay
);
2475 msecs_to_jiffies(params
->spp_sackdelay
);
2477 sp
->sackdelay
= params
->spp_sackdelay
;
2481 if (sackdelay_change
) {
2483 trans
->param_flags
=
2484 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2488 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2492 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2497 /* Note that a value of zero indicates the current setting should be
2500 if (params
->spp_pathmaxrxt
) {
2502 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2504 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2506 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2513 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2514 char __user
*optval
,
2515 unsigned int optlen
)
2517 struct sctp_paddrparams params
;
2518 struct sctp_transport
*trans
= NULL
;
2519 struct sctp_association
*asoc
= NULL
;
2520 struct sctp_sock
*sp
= sctp_sk(sk
);
2522 int hb_change
, pmtud_change
, sackdelay_change
;
2524 if (optlen
!= sizeof(struct sctp_paddrparams
))
2527 if (copy_from_user(¶ms
, optval
, optlen
))
2530 /* Validate flags and value parameters. */
2531 hb_change
= params
.spp_flags
& SPP_HB
;
2532 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2533 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2535 if (hb_change
== SPP_HB
||
2536 pmtud_change
== SPP_PMTUD
||
2537 sackdelay_change
== SPP_SACKDELAY
||
2538 params
.spp_sackdelay
> 500 ||
2539 (params
.spp_pathmtu
&&
2540 params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2543 /* If an address other than INADDR_ANY is specified, and
2544 * no transport is found, then the request is invalid.
2546 if (!sctp_is_any(sk
, (union sctp_addr
*)¶ms
.spp_address
)) {
2547 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2548 params
.spp_assoc_id
);
2553 /* Get association, if assoc_id != 0 and the socket is a one
2554 * to many style socket, and an association was not found, then
2555 * the id was invalid.
2557 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2558 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2561 /* Heartbeat demand can only be sent on a transport or
2562 * association, but not a socket.
2564 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2567 /* Process parameters. */
2568 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2569 hb_change
, pmtud_change
,
2575 /* If changes are for association, also apply parameters to each
2578 if (!trans
&& asoc
) {
2579 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2581 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2582 hb_change
, pmtud_change
,
2590 static inline __u32
sctp_spp_sackdelay_enable(__u32 param_flags
)
2592 return (param_flags
& ~SPP_SACKDELAY
) | SPP_SACKDELAY_ENABLE
;
2595 static inline __u32
sctp_spp_sackdelay_disable(__u32 param_flags
)
2597 return (param_flags
& ~SPP_SACKDELAY
) | SPP_SACKDELAY_DISABLE
;
2601 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2603 * This option will effect the way delayed acks are performed. This
2604 * option allows you to get or set the delayed ack time, in
2605 * milliseconds. It also allows changing the delayed ack frequency.
2606 * Changing the frequency to 1 disables the delayed sack algorithm. If
2607 * the assoc_id is 0, then this sets or gets the endpoints default
2608 * values. If the assoc_id field is non-zero, then the set or get
2609 * effects the specified association for the one to many model (the
2610 * assoc_id field is ignored by the one to one model). Note that if
2611 * sack_delay or sack_freq are 0 when setting this option, then the
2612 * current values will remain unchanged.
2614 * struct sctp_sack_info {
2615 * sctp_assoc_t sack_assoc_id;
2616 * uint32_t sack_delay;
2617 * uint32_t sack_freq;
2620 * sack_assoc_id - This parameter, indicates which association the user
2621 * is performing an action upon. Note that if this field's value is
2622 * zero then the endpoints default value is changed (effecting future
2623 * associations only).
2625 * sack_delay - This parameter contains the number of milliseconds that
2626 * the user is requesting the delayed ACK timer be set to. Note that
2627 * this value is defined in the standard to be between 200 and 500
2630 * sack_freq - This parameter contains the number of packets that must
2631 * be received before a sack is sent without waiting for the delay
2632 * timer to expire. The default value for this is 2, setting this
2633 * value to 1 will disable the delayed sack algorithm.
2636 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2637 char __user
*optval
, unsigned int optlen
)
2639 struct sctp_sack_info params
;
2640 struct sctp_transport
*trans
= NULL
;
2641 struct sctp_association
*asoc
= NULL
;
2642 struct sctp_sock
*sp
= sctp_sk(sk
);
2644 if (optlen
== sizeof(struct sctp_sack_info
)) {
2645 if (copy_from_user(¶ms
, optval
, optlen
))
2648 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2650 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2651 pr_warn_ratelimited(DEPRECATED
2653 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2654 "Use struct sctp_sack_info instead\n",
2655 current
->comm
, task_pid_nr(current
));
2656 if (copy_from_user(¶ms
, optval
, optlen
))
2659 if (params
.sack_delay
== 0)
2660 params
.sack_freq
= 1;
2662 params
.sack_freq
= 0;
2666 /* Validate value parameter. */
2667 if (params
.sack_delay
> 500)
2670 /* Get association, if sack_assoc_id != 0 and the socket is a one
2671 * to many style socket, and an association was not found, then
2672 * the id was invalid.
2674 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2675 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2678 if (params
.sack_delay
) {
2681 msecs_to_jiffies(params
.sack_delay
);
2683 sctp_spp_sackdelay_enable(asoc
->param_flags
);
2685 sp
->sackdelay
= params
.sack_delay
;
2687 sctp_spp_sackdelay_enable(sp
->param_flags
);
2691 if (params
.sack_freq
== 1) {
2694 sctp_spp_sackdelay_disable(asoc
->param_flags
);
2697 sctp_spp_sackdelay_disable(sp
->param_flags
);
2699 } else if (params
.sack_freq
> 1) {
2701 asoc
->sackfreq
= params
.sack_freq
;
2703 sctp_spp_sackdelay_enable(asoc
->param_flags
);
2705 sp
->sackfreq
= params
.sack_freq
;
2707 sctp_spp_sackdelay_enable(sp
->param_flags
);
2711 /* If change is for association, also apply to each transport. */
2713 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2715 if (params
.sack_delay
) {
2717 msecs_to_jiffies(params
.sack_delay
);
2718 trans
->param_flags
=
2719 sctp_spp_sackdelay_enable(trans
->param_flags
);
2721 if (params
.sack_freq
== 1) {
2722 trans
->param_flags
=
2723 sctp_spp_sackdelay_disable(trans
->param_flags
);
2724 } else if (params
.sack_freq
> 1) {
2725 trans
->sackfreq
= params
.sack_freq
;
2726 trans
->param_flags
=
2727 sctp_spp_sackdelay_enable(trans
->param_flags
);
2735 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2737 * Applications can specify protocol parameters for the default association
2738 * initialization. The option name argument to setsockopt() and getsockopt()
2741 * Setting initialization parameters is effective only on an unconnected
2742 * socket (for UDP-style sockets only future associations are effected
2743 * by the change). With TCP-style sockets, this option is inherited by
2744 * sockets derived from a listener socket.
2746 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2748 struct sctp_initmsg sinit
;
2749 struct sctp_sock
*sp
= sctp_sk(sk
);
2751 if (optlen
!= sizeof(struct sctp_initmsg
))
2753 if (copy_from_user(&sinit
, optval
, optlen
))
2756 if (sinit
.sinit_num_ostreams
)
2757 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2758 if (sinit
.sinit_max_instreams
)
2759 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2760 if (sinit
.sinit_max_attempts
)
2761 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2762 if (sinit
.sinit_max_init_timeo
)
2763 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2769 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2771 * Applications that wish to use the sendto() system call may wish to
2772 * specify a default set of parameters that would normally be supplied
2773 * through the inclusion of ancillary data. This socket option allows
2774 * such an application to set the default sctp_sndrcvinfo structure.
2775 * The application that wishes to use this socket option simply passes
2776 * in to this call the sctp_sndrcvinfo structure defined in Section
2777 * 5.2.2) The input parameters accepted by this call include
2778 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2779 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2780 * to this call if the caller is using the UDP model.
2782 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2783 char __user
*optval
,
2784 unsigned int optlen
)
2786 struct sctp_sock
*sp
= sctp_sk(sk
);
2787 struct sctp_association
*asoc
;
2788 struct sctp_sndrcvinfo info
;
2790 if (optlen
!= sizeof(info
))
2792 if (copy_from_user(&info
, optval
, optlen
))
2794 if (info
.sinfo_flags
&
2795 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
2796 SCTP_ABORT
| SCTP_EOF
))
2799 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2800 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2803 asoc
->default_stream
= info
.sinfo_stream
;
2804 asoc
->default_flags
= info
.sinfo_flags
;
2805 asoc
->default_ppid
= info
.sinfo_ppid
;
2806 asoc
->default_context
= info
.sinfo_context
;
2807 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2809 sp
->default_stream
= info
.sinfo_stream
;
2810 sp
->default_flags
= info
.sinfo_flags
;
2811 sp
->default_ppid
= info
.sinfo_ppid
;
2812 sp
->default_context
= info
.sinfo_context
;
2813 sp
->default_timetolive
= info
.sinfo_timetolive
;
2819 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2820 * (SCTP_DEFAULT_SNDINFO)
2822 static int sctp_setsockopt_default_sndinfo(struct sock
*sk
,
2823 char __user
*optval
,
2824 unsigned int optlen
)
2826 struct sctp_sock
*sp
= sctp_sk(sk
);
2827 struct sctp_association
*asoc
;
2828 struct sctp_sndinfo info
;
2830 if (optlen
!= sizeof(info
))
2832 if (copy_from_user(&info
, optval
, optlen
))
2834 if (info
.snd_flags
&
2835 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
2836 SCTP_ABORT
| SCTP_EOF
))
2839 asoc
= sctp_id2assoc(sk
, info
.snd_assoc_id
);
2840 if (!asoc
&& info
.snd_assoc_id
&& sctp_style(sk
, UDP
))
2843 asoc
->default_stream
= info
.snd_sid
;
2844 asoc
->default_flags
= info
.snd_flags
;
2845 asoc
->default_ppid
= info
.snd_ppid
;
2846 asoc
->default_context
= info
.snd_context
;
2848 sp
->default_stream
= info
.snd_sid
;
2849 sp
->default_flags
= info
.snd_flags
;
2850 sp
->default_ppid
= info
.snd_ppid
;
2851 sp
->default_context
= info
.snd_context
;
2857 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2859 * Requests that the local SCTP stack use the enclosed peer address as
2860 * the association primary. The enclosed address must be one of the
2861 * association peer's addresses.
2863 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2864 unsigned int optlen
)
2866 struct sctp_prim prim
;
2867 struct sctp_transport
*trans
;
2869 if (optlen
!= sizeof(struct sctp_prim
))
2872 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2875 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2879 sctp_assoc_set_primary(trans
->asoc
, trans
);
2885 * 7.1.5 SCTP_NODELAY
2887 * Turn on/off any Nagle-like algorithm. This means that packets are
2888 * generally sent as soon as possible and no unnecessary delays are
2889 * introduced, at the cost of more packets in the network. Expects an
2890 * integer boolean flag.
2892 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2893 unsigned int optlen
)
2897 if (optlen
< sizeof(int))
2899 if (get_user(val
, (int __user
*)optval
))
2902 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2908 * 7.1.1 SCTP_RTOINFO
2910 * The protocol parameters used to initialize and bound retransmission
2911 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2912 * and modify these parameters.
2913 * All parameters are time values, in milliseconds. A value of 0, when
2914 * modifying the parameters, indicates that the current value should not
2918 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2920 struct sctp_rtoinfo rtoinfo
;
2921 struct sctp_association
*asoc
;
2922 unsigned long rto_min
, rto_max
;
2923 struct sctp_sock
*sp
= sctp_sk(sk
);
2925 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2928 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2931 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2933 /* Set the values to the specific association */
2934 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2937 rto_max
= rtoinfo
.srto_max
;
2938 rto_min
= rtoinfo
.srto_min
;
2941 rto_max
= asoc
? msecs_to_jiffies(rto_max
) : rto_max
;
2943 rto_max
= asoc
? asoc
->rto_max
: sp
->rtoinfo
.srto_max
;
2946 rto_min
= asoc
? msecs_to_jiffies(rto_min
) : rto_min
;
2948 rto_min
= asoc
? asoc
->rto_min
: sp
->rtoinfo
.srto_min
;
2950 if (rto_min
> rto_max
)
2954 if (rtoinfo
.srto_initial
!= 0)
2956 msecs_to_jiffies(rtoinfo
.srto_initial
);
2957 asoc
->rto_max
= rto_max
;
2958 asoc
->rto_min
= rto_min
;
2960 /* If there is no association or the association-id = 0
2961 * set the values to the endpoint.
2963 if (rtoinfo
.srto_initial
!= 0)
2964 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2965 sp
->rtoinfo
.srto_max
= rto_max
;
2966 sp
->rtoinfo
.srto_min
= rto_min
;
2974 * 7.1.2 SCTP_ASSOCINFO
2976 * This option is used to tune the maximum retransmission attempts
2977 * of the association.
2978 * Returns an error if the new association retransmission value is
2979 * greater than the sum of the retransmission value of the peer.
2980 * See [SCTP] for more information.
2983 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2986 struct sctp_assocparams assocparams
;
2987 struct sctp_association
*asoc
;
2989 if (optlen
!= sizeof(struct sctp_assocparams
))
2991 if (copy_from_user(&assocparams
, optval
, optlen
))
2994 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2996 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
2999 /* Set the values to the specific association */
3001 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
3004 struct sctp_transport
*peer_addr
;
3006 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
3008 path_sum
+= peer_addr
->pathmaxrxt
;
3012 /* Only validate asocmaxrxt if we have more than
3013 * one path/transport. We do this because path
3014 * retransmissions are only counted when we have more
3018 assocparams
.sasoc_asocmaxrxt
> path_sum
)
3021 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
3024 if (assocparams
.sasoc_cookie_life
!= 0)
3025 asoc
->cookie_life
= ms_to_ktime(assocparams
.sasoc_cookie_life
);
3027 /* Set the values to the endpoint */
3028 struct sctp_sock
*sp
= sctp_sk(sk
);
3030 if (assocparams
.sasoc_asocmaxrxt
!= 0)
3031 sp
->assocparams
.sasoc_asocmaxrxt
=
3032 assocparams
.sasoc_asocmaxrxt
;
3033 if (assocparams
.sasoc_cookie_life
!= 0)
3034 sp
->assocparams
.sasoc_cookie_life
=
3035 assocparams
.sasoc_cookie_life
;
3041 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3043 * This socket option is a boolean flag which turns on or off mapped V4
3044 * addresses. If this option is turned on and the socket is type
3045 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3046 * If this option is turned off, then no mapping will be done of V4
3047 * addresses and a user will receive both PF_INET6 and PF_INET type
3048 * addresses on the socket.
3050 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
3053 struct sctp_sock
*sp
= sctp_sk(sk
);
3055 if (optlen
< sizeof(int))
3057 if (get_user(val
, (int __user
*)optval
))
3068 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3069 * This option will get or set the maximum size to put in any outgoing
3070 * SCTP DATA chunk. If a message is larger than this size it will be
3071 * fragmented by SCTP into the specified size. Note that the underlying
3072 * SCTP implementation may fragment into smaller sized chunks when the
3073 * PMTU of the underlying association is smaller than the value set by
3074 * the user. The default value for this option is '0' which indicates
3075 * the user is NOT limiting fragmentation and only the PMTU will effect
3076 * SCTP's choice of DATA chunk size. Note also that values set larger
3077 * than the maximum size of an IP datagram will effectively let SCTP
3078 * control fragmentation (i.e. the same as setting this option to 0).
3080 * The following structure is used to access and modify this parameter:
3082 * struct sctp_assoc_value {
3083 * sctp_assoc_t assoc_id;
3084 * uint32_t assoc_value;
3087 * assoc_id: This parameter is ignored for one-to-one style sockets.
3088 * For one-to-many style sockets this parameter indicates which
3089 * association the user is performing an action upon. Note that if
3090 * this field's value is zero then the endpoints default value is
3091 * changed (effecting future associations only).
3092 * assoc_value: This parameter specifies the maximum size in bytes.
3094 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
3096 struct sctp_assoc_value params
;
3097 struct sctp_association
*asoc
;
3098 struct sctp_sock
*sp
= sctp_sk(sk
);
3101 if (optlen
== sizeof(int)) {
3102 pr_warn_ratelimited(DEPRECATED
3104 "Use of int in maxseg socket option.\n"
3105 "Use struct sctp_assoc_value instead\n",
3106 current
->comm
, task_pid_nr(current
));
3107 if (copy_from_user(&val
, optval
, optlen
))
3109 params
.assoc_id
= 0;
3110 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3111 if (copy_from_user(¶ms
, optval
, optlen
))
3113 val
= params
.assoc_value
;
3117 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
3120 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3121 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
3126 val
= asoc
->pathmtu
;
3127 val
-= sp
->pf
->af
->net_header_len
;
3128 val
-= sizeof(struct sctphdr
) +
3129 sizeof(struct sctp_data_chunk
);
3131 asoc
->user_frag
= val
;
3132 asoc
->frag_point
= sctp_frag_point(asoc
, asoc
->pathmtu
);
3134 sp
->user_frag
= val
;
3142 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3144 * Requests that the peer mark the enclosed address as the association
3145 * primary. The enclosed address must be one of the association's
3146 * locally bound addresses. The following structure is used to make a
3147 * set primary request:
3149 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
3150 unsigned int optlen
)
3152 struct net
*net
= sock_net(sk
);
3153 struct sctp_sock
*sp
;
3154 struct sctp_association
*asoc
= NULL
;
3155 struct sctp_setpeerprim prim
;
3156 struct sctp_chunk
*chunk
;
3162 if (!net
->sctp
.addip_enable
)
3165 if (optlen
!= sizeof(struct sctp_setpeerprim
))
3168 if (copy_from_user(&prim
, optval
, optlen
))
3171 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
3175 if (!asoc
->peer
.asconf_capable
)
3178 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
3181 if (!sctp_state(asoc
, ESTABLISHED
))
3184 af
= sctp_get_af_specific(prim
.sspp_addr
.ss_family
);
3188 if (!af
->addr_valid((union sctp_addr
*)&prim
.sspp_addr
, sp
, NULL
))
3189 return -EADDRNOTAVAIL
;
3191 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
3192 return -EADDRNOTAVAIL
;
3194 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3195 chunk
= sctp_make_asconf_set_prim(asoc
,
3196 (union sctp_addr
*)&prim
.sspp_addr
);
3200 err
= sctp_send_asconf(asoc
, chunk
);
3202 pr_debug("%s: we set peer primary addr primitively\n", __func__
);
3207 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
3208 unsigned int optlen
)
3210 struct sctp_setadaptation adaptation
;
3212 if (optlen
!= sizeof(struct sctp_setadaptation
))
3214 if (copy_from_user(&adaptation
, optval
, optlen
))
3217 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
3223 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3225 * The context field in the sctp_sndrcvinfo structure is normally only
3226 * used when a failed message is retrieved holding the value that was
3227 * sent down on the actual send call. This option allows the setting of
3228 * a default context on an association basis that will be received on
3229 * reading messages from the peer. This is especially helpful in the
3230 * one-2-many model for an application to keep some reference to an
3231 * internal state machine that is processing messages on the
3232 * association. Note that the setting of this value only effects
3233 * received messages from the peer and does not effect the value that is
3234 * saved with outbound messages.
3236 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
3237 unsigned int optlen
)
3239 struct sctp_assoc_value params
;
3240 struct sctp_sock
*sp
;
3241 struct sctp_association
*asoc
;
3243 if (optlen
!= sizeof(struct sctp_assoc_value
))
3245 if (copy_from_user(¶ms
, optval
, optlen
))
3250 if (params
.assoc_id
!= 0) {
3251 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3254 asoc
->default_rcv_context
= params
.assoc_value
;
3256 sp
->default_rcv_context
= params
.assoc_value
;
3263 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3265 * This options will at a minimum specify if the implementation is doing
3266 * fragmented interleave. Fragmented interleave, for a one to many
3267 * socket, is when subsequent calls to receive a message may return
3268 * parts of messages from different associations. Some implementations
3269 * may allow you to turn this value on or off. If so, when turned off,
3270 * no fragment interleave will occur (which will cause a head of line
3271 * blocking amongst multiple associations sharing the same one to many
3272 * socket). When this option is turned on, then each receive call may
3273 * come from a different association (thus the user must receive data
3274 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3275 * association each receive belongs to.
3277 * This option takes a boolean value. A non-zero value indicates that
3278 * fragmented interleave is on. A value of zero indicates that
3279 * fragmented interleave is off.
3281 * Note that it is important that an implementation that allows this
3282 * option to be turned on, have it off by default. Otherwise an unaware
3283 * application using the one to many model may become confused and act
3286 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
3287 char __user
*optval
,
3288 unsigned int optlen
)
3292 if (optlen
!= sizeof(int))
3294 if (get_user(val
, (int __user
*)optval
))
3297 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
3303 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3304 * (SCTP_PARTIAL_DELIVERY_POINT)
3306 * This option will set or get the SCTP partial delivery point. This
3307 * point is the size of a message where the partial delivery API will be
3308 * invoked to help free up rwnd space for the peer. Setting this to a
3309 * lower value will cause partial deliveries to happen more often. The
3310 * calls argument is an integer that sets or gets the partial delivery
3311 * point. Note also that the call will fail if the user attempts to set
3312 * this value larger than the socket receive buffer size.
3314 * Note that any single message having a length smaller than or equal to
3315 * the SCTP partial delivery point will be delivered in one single read
3316 * call as long as the user provided buffer is large enough to hold the
3319 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
3320 char __user
*optval
,
3321 unsigned int optlen
)
3325 if (optlen
!= sizeof(u32
))
3327 if (get_user(val
, (int __user
*)optval
))
3330 /* Note: We double the receive buffer from what the user sets
3331 * it to be, also initial rwnd is based on rcvbuf/2.
3333 if (val
> (sk
->sk_rcvbuf
>> 1))
3336 sctp_sk(sk
)->pd_point
= val
;
3338 return 0; /* is this the right error code? */
3342 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3344 * This option will allow a user to change the maximum burst of packets
3345 * that can be emitted by this association. Note that the default value
3346 * is 4, and some implementations may restrict this setting so that it
3347 * can only be lowered.
3349 * NOTE: This text doesn't seem right. Do this on a socket basis with
3350 * future associations inheriting the socket value.
3352 static int sctp_setsockopt_maxburst(struct sock
*sk
,
3353 char __user
*optval
,
3354 unsigned int optlen
)
3356 struct sctp_assoc_value params
;
3357 struct sctp_sock
*sp
;
3358 struct sctp_association
*asoc
;
3362 if (optlen
== sizeof(int)) {
3363 pr_warn_ratelimited(DEPRECATED
3365 "Use of int in max_burst socket option deprecated.\n"
3366 "Use struct sctp_assoc_value instead\n",
3367 current
->comm
, task_pid_nr(current
));
3368 if (copy_from_user(&val
, optval
, optlen
))
3370 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3371 if (copy_from_user(¶ms
, optval
, optlen
))
3373 val
= params
.assoc_value
;
3374 assoc_id
= params
.assoc_id
;
3380 if (assoc_id
!= 0) {
3381 asoc
= sctp_id2assoc(sk
, assoc_id
);
3384 asoc
->max_burst
= val
;
3386 sp
->max_burst
= val
;
3392 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3394 * This set option adds a chunk type that the user is requesting to be
3395 * received only in an authenticated way. Changes to the list of chunks
3396 * will only effect future associations on the socket.
3398 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
3399 char __user
*optval
,
3400 unsigned int optlen
)
3402 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3403 struct sctp_authchunk val
;
3405 if (!ep
->auth_enable
)
3408 if (optlen
!= sizeof(struct sctp_authchunk
))
3410 if (copy_from_user(&val
, optval
, optlen
))
3413 switch (val
.sauth_chunk
) {
3415 case SCTP_CID_INIT_ACK
:
3416 case SCTP_CID_SHUTDOWN_COMPLETE
:
3421 /* add this chunk id to the endpoint */
3422 return sctp_auth_ep_add_chunkid(ep
, val
.sauth_chunk
);
3426 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3428 * This option gets or sets the list of HMAC algorithms that the local
3429 * endpoint requires the peer to use.
3431 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
3432 char __user
*optval
,
3433 unsigned int optlen
)
3435 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3436 struct sctp_hmacalgo
*hmacs
;
3440 if (!ep
->auth_enable
)
3443 if (optlen
< sizeof(struct sctp_hmacalgo
))
3446 hmacs
= memdup_user(optval
, optlen
);
3448 return PTR_ERR(hmacs
);
3450 idents
= hmacs
->shmac_num_idents
;
3451 if (idents
== 0 || idents
> SCTP_AUTH_NUM_HMACS
||
3452 (idents
* sizeof(u16
)) > (optlen
- sizeof(struct sctp_hmacalgo
))) {
3457 err
= sctp_auth_ep_set_hmacs(ep
, hmacs
);
3464 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3466 * This option will set a shared secret key which is used to build an
3467 * association shared key.
3469 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3470 char __user
*optval
,
3471 unsigned int optlen
)
3473 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3474 struct sctp_authkey
*authkey
;
3475 struct sctp_association
*asoc
;
3478 if (!ep
->auth_enable
)
3481 if (optlen
<= sizeof(struct sctp_authkey
))
3484 authkey
= memdup_user(optval
, optlen
);
3485 if (IS_ERR(authkey
))
3486 return PTR_ERR(authkey
);
3488 if (authkey
->sca_keylength
> optlen
- sizeof(struct sctp_authkey
)) {
3493 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3494 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3499 ret
= sctp_auth_set_key(ep
, asoc
, authkey
);
3506 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3508 * This option will get or set the active shared key to be used to build
3509 * the association shared key.
3511 static int sctp_setsockopt_active_key(struct sock
*sk
,
3512 char __user
*optval
,
3513 unsigned int optlen
)
3515 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3516 struct sctp_authkeyid val
;
3517 struct sctp_association
*asoc
;
3519 if (!ep
->auth_enable
)
3522 if (optlen
!= sizeof(struct sctp_authkeyid
))
3524 if (copy_from_user(&val
, optval
, optlen
))
3527 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3528 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3531 return sctp_auth_set_active_key(ep
, asoc
, val
.scact_keynumber
);
3535 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3537 * This set option will delete a shared secret key from use.
3539 static int sctp_setsockopt_del_key(struct sock
*sk
,
3540 char __user
*optval
,
3541 unsigned int optlen
)
3543 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3544 struct sctp_authkeyid val
;
3545 struct sctp_association
*asoc
;
3547 if (!ep
->auth_enable
)
3550 if (optlen
!= sizeof(struct sctp_authkeyid
))
3552 if (copy_from_user(&val
, optval
, optlen
))
3555 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3556 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3559 return sctp_auth_del_key_id(ep
, asoc
, val
.scact_keynumber
);
3564 * 8.1.23 SCTP_AUTO_ASCONF
3566 * This option will enable or disable the use of the automatic generation of
3567 * ASCONF chunks to add and delete addresses to an existing association. Note
3568 * that this option has two caveats namely: a) it only affects sockets that
3569 * are bound to all addresses available to the SCTP stack, and b) the system
3570 * administrator may have an overriding control that turns the ASCONF feature
3571 * off no matter what setting the socket option may have.
3572 * This option expects an integer boolean flag, where a non-zero value turns on
3573 * the option, and a zero value turns off the option.
3574 * Note. In this implementation, socket operation overrides default parameter
3575 * being set by sysctl as well as FreeBSD implementation
3577 static int sctp_setsockopt_auto_asconf(struct sock
*sk
, char __user
*optval
,
3578 unsigned int optlen
)
3581 struct sctp_sock
*sp
= sctp_sk(sk
);
3583 if (optlen
< sizeof(int))
3585 if (get_user(val
, (int __user
*)optval
))
3587 if (!sctp_is_ep_boundall(sk
) && val
)
3589 if ((val
&& sp
->do_auto_asconf
) || (!val
&& !sp
->do_auto_asconf
))
3592 spin_lock_bh(&sock_net(sk
)->sctp
.addr_wq_lock
);
3593 if (val
== 0 && sp
->do_auto_asconf
) {
3594 list_del(&sp
->auto_asconf_list
);
3595 sp
->do_auto_asconf
= 0;
3596 } else if (val
&& !sp
->do_auto_asconf
) {
3597 list_add_tail(&sp
->auto_asconf_list
,
3598 &sock_net(sk
)->sctp
.auto_asconf_splist
);
3599 sp
->do_auto_asconf
= 1;
3601 spin_unlock_bh(&sock_net(sk
)->sctp
.addr_wq_lock
);
3606 * SCTP_PEER_ADDR_THLDS
3608 * This option allows us to alter the partially failed threshold for one or all
3609 * transports in an association. See Section 6.1 of:
3610 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3612 static int sctp_setsockopt_paddr_thresholds(struct sock
*sk
,
3613 char __user
*optval
,
3614 unsigned int optlen
)
3616 struct sctp_paddrthlds val
;
3617 struct sctp_transport
*trans
;
3618 struct sctp_association
*asoc
;
3620 if (optlen
< sizeof(struct sctp_paddrthlds
))
3622 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
,
3623 sizeof(struct sctp_paddrthlds
)))
3627 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
3628 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
3631 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
3633 if (val
.spt_pathmaxrxt
)
3634 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3635 trans
->pf_retrans
= val
.spt_pathpfthld
;
3638 if (val
.spt_pathmaxrxt
)
3639 asoc
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3640 asoc
->pf_retrans
= val
.spt_pathpfthld
;
3642 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
3647 if (val
.spt_pathmaxrxt
)
3648 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3649 trans
->pf_retrans
= val
.spt_pathpfthld
;
3655 static int sctp_setsockopt_recvrcvinfo(struct sock
*sk
,
3656 char __user
*optval
,
3657 unsigned int optlen
)
3661 if (optlen
< sizeof(int))
3663 if (get_user(val
, (int __user
*) optval
))
3666 sctp_sk(sk
)->recvrcvinfo
= (val
== 0) ? 0 : 1;
3671 static int sctp_setsockopt_recvnxtinfo(struct sock
*sk
,
3672 char __user
*optval
,
3673 unsigned int optlen
)
3677 if (optlen
< sizeof(int))
3679 if (get_user(val
, (int __user
*) optval
))
3682 sctp_sk(sk
)->recvnxtinfo
= (val
== 0) ? 0 : 1;
3687 static int sctp_setsockopt_pr_supported(struct sock
*sk
,
3688 char __user
*optval
,
3689 unsigned int optlen
)
3691 struct sctp_assoc_value params
;
3692 struct sctp_association
*asoc
;
3693 int retval
= -EINVAL
;
3695 if (optlen
!= sizeof(params
))
3698 if (copy_from_user(¶ms
, optval
, optlen
)) {
3703 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3705 asoc
->prsctp_enable
= !!params
.assoc_value
;
3706 } else if (!params
.assoc_id
) {
3707 struct sctp_sock
*sp
= sctp_sk(sk
);
3709 sp
->ep
->prsctp_enable
= !!params
.assoc_value
;
3720 static int sctp_setsockopt_default_prinfo(struct sock
*sk
,
3721 char __user
*optval
,
3722 unsigned int optlen
)
3724 struct sctp_default_prinfo info
;
3725 struct sctp_association
*asoc
;
3726 int retval
= -EINVAL
;
3728 if (optlen
!= sizeof(info
))
3731 if (copy_from_user(&info
, optval
, sizeof(info
))) {
3736 if (info
.pr_policy
& ~SCTP_PR_SCTP_MASK
)
3739 if (info
.pr_policy
== SCTP_PR_SCTP_NONE
)
3742 asoc
= sctp_id2assoc(sk
, info
.pr_assoc_id
);
3744 SCTP_PR_SET_POLICY(asoc
->default_flags
, info
.pr_policy
);
3745 asoc
->default_timetolive
= info
.pr_value
;
3746 } else if (!info
.pr_assoc_id
) {
3747 struct sctp_sock
*sp
= sctp_sk(sk
);
3749 SCTP_PR_SET_POLICY(sp
->default_flags
, info
.pr_policy
);
3750 sp
->default_timetolive
= info
.pr_value
;
3761 static int sctp_setsockopt_reconfig_supported(struct sock
*sk
,
3762 char __user
*optval
,
3763 unsigned int optlen
)
3765 struct sctp_assoc_value params
;
3766 struct sctp_association
*asoc
;
3767 int retval
= -EINVAL
;
3769 if (optlen
!= sizeof(params
))
3772 if (copy_from_user(¶ms
, optval
, optlen
)) {
3777 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3779 asoc
->reconf_enable
= !!params
.assoc_value
;
3780 } else if (!params
.assoc_id
) {
3781 struct sctp_sock
*sp
= sctp_sk(sk
);
3783 sp
->ep
->reconf_enable
= !!params
.assoc_value
;
3794 static int sctp_setsockopt_enable_strreset(struct sock
*sk
,
3795 char __user
*optval
,
3796 unsigned int optlen
)
3798 struct sctp_assoc_value params
;
3799 struct sctp_association
*asoc
;
3800 int retval
= -EINVAL
;
3802 if (optlen
!= sizeof(params
))
3805 if (copy_from_user(¶ms
, optval
, optlen
)) {
3810 if (params
.assoc_value
& (~SCTP_ENABLE_STRRESET_MASK
))
3813 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3815 asoc
->strreset_enable
= params
.assoc_value
;
3816 } else if (!params
.assoc_id
) {
3817 struct sctp_sock
*sp
= sctp_sk(sk
);
3819 sp
->ep
->strreset_enable
= params
.assoc_value
;
3830 static int sctp_setsockopt_reset_streams(struct sock
*sk
,
3831 char __user
*optval
,
3832 unsigned int optlen
)
3834 struct sctp_reset_streams
*params
;
3835 struct sctp_association
*asoc
;
3836 int retval
= -EINVAL
;
3838 if (optlen
< sizeof(struct sctp_reset_streams
))
3841 params
= memdup_user(optval
, optlen
);
3843 return PTR_ERR(params
);
3845 asoc
= sctp_id2assoc(sk
, params
->srs_assoc_id
);
3849 retval
= sctp_send_reset_streams(asoc
, params
);
3856 static int sctp_setsockopt_reset_assoc(struct sock
*sk
,
3857 char __user
*optval
,
3858 unsigned int optlen
)
3860 struct sctp_association
*asoc
;
3861 sctp_assoc_t associd
;
3862 int retval
= -EINVAL
;
3864 if (optlen
!= sizeof(associd
))
3867 if (copy_from_user(&associd
, optval
, optlen
)) {
3872 asoc
= sctp_id2assoc(sk
, associd
);
3876 retval
= sctp_send_reset_assoc(asoc
);
3882 static int sctp_setsockopt_add_streams(struct sock
*sk
,
3883 char __user
*optval
,
3884 unsigned int optlen
)
3886 struct sctp_association
*asoc
;
3887 struct sctp_add_streams params
;
3888 int retval
= -EINVAL
;
3890 if (optlen
!= sizeof(params
))
3893 if (copy_from_user(¶ms
, optval
, optlen
)) {
3898 asoc
= sctp_id2assoc(sk
, params
.sas_assoc_id
);
3902 retval
= sctp_send_add_streams(asoc
, ¶ms
);
3908 /* API 6.2 setsockopt(), getsockopt()
3910 * Applications use setsockopt() and getsockopt() to set or retrieve
3911 * socket options. Socket options are used to change the default
3912 * behavior of sockets calls. They are described in Section 7.
3916 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3917 * int __user *optlen);
3918 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3921 * sd - the socket descript.
3922 * level - set to IPPROTO_SCTP for all SCTP options.
3923 * optname - the option name.
3924 * optval - the buffer to store the value of the option.
3925 * optlen - the size of the buffer.
3927 static int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3928 char __user
*optval
, unsigned int optlen
)
3932 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
3934 /* I can hardly begin to describe how wrong this is. This is
3935 * so broken as to be worse than useless. The API draft
3936 * REALLY is NOT helpful here... I am not convinced that the
3937 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3938 * are at all well-founded.
3940 if (level
!= SOL_SCTP
) {
3941 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3942 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3949 case SCTP_SOCKOPT_BINDX_ADD
:
3950 /* 'optlen' is the size of the addresses buffer. */
3951 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3952 optlen
, SCTP_BINDX_ADD_ADDR
);
3955 case SCTP_SOCKOPT_BINDX_REM
:
3956 /* 'optlen' is the size of the addresses buffer. */
3957 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3958 optlen
, SCTP_BINDX_REM_ADDR
);
3961 case SCTP_SOCKOPT_CONNECTX_OLD
:
3962 /* 'optlen' is the size of the addresses buffer. */
3963 retval
= sctp_setsockopt_connectx_old(sk
,
3964 (struct sockaddr __user
*)optval
,
3968 case SCTP_SOCKOPT_CONNECTX
:
3969 /* 'optlen' is the size of the addresses buffer. */
3970 retval
= sctp_setsockopt_connectx(sk
,
3971 (struct sockaddr __user
*)optval
,
3975 case SCTP_DISABLE_FRAGMENTS
:
3976 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3980 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3983 case SCTP_AUTOCLOSE
:
3984 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3987 case SCTP_PEER_ADDR_PARAMS
:
3988 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3991 case SCTP_DELAYED_SACK
:
3992 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3994 case SCTP_PARTIAL_DELIVERY_POINT
:
3995 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
3999 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
4001 case SCTP_DEFAULT_SEND_PARAM
:
4002 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
4005 case SCTP_DEFAULT_SNDINFO
:
4006 retval
= sctp_setsockopt_default_sndinfo(sk
, optval
, optlen
);
4008 case SCTP_PRIMARY_ADDR
:
4009 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
4011 case SCTP_SET_PEER_PRIMARY_ADDR
:
4012 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
4015 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
4018 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
4020 case SCTP_ASSOCINFO
:
4021 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
4023 case SCTP_I_WANT_MAPPED_V4_ADDR
:
4024 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
4027 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
4029 case SCTP_ADAPTATION_LAYER
:
4030 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
4033 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
4035 case SCTP_FRAGMENT_INTERLEAVE
:
4036 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
4038 case SCTP_MAX_BURST
:
4039 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
4041 case SCTP_AUTH_CHUNK
:
4042 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
4044 case SCTP_HMAC_IDENT
:
4045 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
4048 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
4050 case SCTP_AUTH_ACTIVE_KEY
:
4051 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
4053 case SCTP_AUTH_DELETE_KEY
:
4054 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
4056 case SCTP_AUTO_ASCONF
:
4057 retval
= sctp_setsockopt_auto_asconf(sk
, optval
, optlen
);
4059 case SCTP_PEER_ADDR_THLDS
:
4060 retval
= sctp_setsockopt_paddr_thresholds(sk
, optval
, optlen
);
4062 case SCTP_RECVRCVINFO
:
4063 retval
= sctp_setsockopt_recvrcvinfo(sk
, optval
, optlen
);
4065 case SCTP_RECVNXTINFO
:
4066 retval
= sctp_setsockopt_recvnxtinfo(sk
, optval
, optlen
);
4068 case SCTP_PR_SUPPORTED
:
4069 retval
= sctp_setsockopt_pr_supported(sk
, optval
, optlen
);
4071 case SCTP_DEFAULT_PRINFO
:
4072 retval
= sctp_setsockopt_default_prinfo(sk
, optval
, optlen
);
4074 case SCTP_RECONFIG_SUPPORTED
:
4075 retval
= sctp_setsockopt_reconfig_supported(sk
, optval
, optlen
);
4077 case SCTP_ENABLE_STREAM_RESET
:
4078 retval
= sctp_setsockopt_enable_strreset(sk
, optval
, optlen
);
4080 case SCTP_RESET_STREAMS
:
4081 retval
= sctp_setsockopt_reset_streams(sk
, optval
, optlen
);
4083 case SCTP_RESET_ASSOC
:
4084 retval
= sctp_setsockopt_reset_assoc(sk
, optval
, optlen
);
4086 case SCTP_ADD_STREAMS
:
4087 retval
= sctp_setsockopt_add_streams(sk
, optval
, optlen
);
4090 retval
= -ENOPROTOOPT
;
4100 /* API 3.1.6 connect() - UDP Style Syntax
4102 * An application may use the connect() call in the UDP model to initiate an
4103 * association without sending data.
4107 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4109 * sd: the socket descriptor to have a new association added to.
4111 * nam: the address structure (either struct sockaddr_in or struct
4112 * sockaddr_in6 defined in RFC2553 [7]).
4114 * len: the size of the address.
4116 static int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
4124 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__
, sk
,
4127 /* Validate addr_len before calling common connect/connectx routine. */
4128 af
= sctp_get_af_specific(addr
->sa_family
);
4129 if (!af
|| addr_len
< af
->sockaddr_len
) {
4132 /* Pass correct addr len to common routine (so it knows there
4133 * is only one address being passed.
4135 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
4142 /* FIXME: Write comments. */
4143 static int sctp_disconnect(struct sock
*sk
, int flags
)
4145 return -EOPNOTSUPP
; /* STUB */
4148 /* 4.1.4 accept() - TCP Style Syntax
4150 * Applications use accept() call to remove an established SCTP
4151 * association from the accept queue of the endpoint. A new socket
4152 * descriptor will be returned from accept() to represent the newly
4153 * formed association.
4155 static struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
, bool kern
)
4157 struct sctp_sock
*sp
;
4158 struct sctp_endpoint
*ep
;
4159 struct sock
*newsk
= NULL
;
4160 struct sctp_association
*asoc
;
4169 if (!sctp_style(sk
, TCP
)) {
4170 error
= -EOPNOTSUPP
;
4174 if (!sctp_sstate(sk
, LISTENING
)) {
4179 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
4181 error
= sctp_wait_for_accept(sk
, timeo
);
4185 /* We treat the list of associations on the endpoint as the accept
4186 * queue and pick the first association on the list.
4188 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
4190 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
, kern
);
4196 /* Populate the fields of the newsk from the oldsk and migrate the
4197 * asoc to the newsk.
4199 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
4207 /* The SCTP ioctl handler. */
4208 static int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
4215 * SEQPACKET-style sockets in LISTENING state are valid, for
4216 * SCTP, so only discard TCP-style sockets in LISTENING state.
4218 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
4223 struct sk_buff
*skb
;
4224 unsigned int amount
= 0;
4226 skb
= skb_peek(&sk
->sk_receive_queue
);
4229 * We will only return the amount of this packet since
4230 * that is all that will be read.
4234 rc
= put_user(amount
, (int __user
*)arg
);
4246 /* This is the function which gets called during socket creation to
4247 * initialized the SCTP-specific portion of the sock.
4248 * The sock structure should already be zero-filled memory.
4250 static int sctp_init_sock(struct sock
*sk
)
4252 struct net
*net
= sock_net(sk
);
4253 struct sctp_sock
*sp
;
4255 pr_debug("%s: sk:%p\n", __func__
, sk
);
4259 /* Initialize the SCTP per socket area. */
4260 switch (sk
->sk_type
) {
4261 case SOCK_SEQPACKET
:
4262 sp
->type
= SCTP_SOCKET_UDP
;
4265 sp
->type
= SCTP_SOCKET_TCP
;
4268 return -ESOCKTNOSUPPORT
;
4271 sk
->sk_gso_type
= SKB_GSO_SCTP
;
4273 /* Initialize default send parameters. These parameters can be
4274 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4276 sp
->default_stream
= 0;
4277 sp
->default_ppid
= 0;
4278 sp
->default_flags
= 0;
4279 sp
->default_context
= 0;
4280 sp
->default_timetolive
= 0;
4282 sp
->default_rcv_context
= 0;
4283 sp
->max_burst
= net
->sctp
.max_burst
;
4285 sp
->sctp_hmac_alg
= net
->sctp
.sctp_hmac_alg
;
4287 /* Initialize default setup parameters. These parameters
4288 * can be modified with the SCTP_INITMSG socket option or
4289 * overridden by the SCTP_INIT CMSG.
4291 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
4292 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
4293 sp
->initmsg
.sinit_max_attempts
= net
->sctp
.max_retrans_init
;
4294 sp
->initmsg
.sinit_max_init_timeo
= net
->sctp
.rto_max
;
4296 /* Initialize default RTO related parameters. These parameters can
4297 * be modified for with the SCTP_RTOINFO socket option.
4299 sp
->rtoinfo
.srto_initial
= net
->sctp
.rto_initial
;
4300 sp
->rtoinfo
.srto_max
= net
->sctp
.rto_max
;
4301 sp
->rtoinfo
.srto_min
= net
->sctp
.rto_min
;
4303 /* Initialize default association related parameters. These parameters
4304 * can be modified with the SCTP_ASSOCINFO socket option.
4306 sp
->assocparams
.sasoc_asocmaxrxt
= net
->sctp
.max_retrans_association
;
4307 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
4308 sp
->assocparams
.sasoc_peer_rwnd
= 0;
4309 sp
->assocparams
.sasoc_local_rwnd
= 0;
4310 sp
->assocparams
.sasoc_cookie_life
= net
->sctp
.valid_cookie_life
;
4312 /* Initialize default event subscriptions. By default, all the
4315 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
4317 /* Default Peer Address Parameters. These defaults can
4318 * be modified via SCTP_PEER_ADDR_PARAMS
4320 sp
->hbinterval
= net
->sctp
.hb_interval
;
4321 sp
->pathmaxrxt
= net
->sctp
.max_retrans_path
;
4322 sp
->pathmtu
= 0; /* allow default discovery */
4323 sp
->sackdelay
= net
->sctp
.sack_timeout
;
4325 sp
->param_flags
= SPP_HB_ENABLE
|
4327 SPP_SACKDELAY_ENABLE
;
4329 /* If enabled no SCTP message fragmentation will be performed.
4330 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4332 sp
->disable_fragments
= 0;
4334 /* Enable Nagle algorithm by default. */
4337 sp
->recvrcvinfo
= 0;
4338 sp
->recvnxtinfo
= 0;
4340 /* Enable by default. */
4343 /* Auto-close idle associations after the configured
4344 * number of seconds. A value of 0 disables this
4345 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4346 * for UDP-style sockets only.
4350 /* User specified fragmentation limit. */
4353 sp
->adaptation_ind
= 0;
4355 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
4357 /* Control variables for partial data delivery. */
4358 atomic_set(&sp
->pd_mode
, 0);
4359 skb_queue_head_init(&sp
->pd_lobby
);
4360 sp
->frag_interleave
= 0;
4362 /* Create a per socket endpoint structure. Even if we
4363 * change the data structure relationships, this may still
4364 * be useful for storing pre-connect address information.
4366 sp
->ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
4372 sk
->sk_destruct
= sctp_destruct_sock
;
4374 SCTP_DBG_OBJCNT_INC(sock
);
4377 percpu_counter_inc(&sctp_sockets_allocated
);
4378 sock_prot_inuse_add(net
, sk
->sk_prot
, 1);
4380 /* Nothing can fail after this block, otherwise
4381 * sctp_destroy_sock() will be called without addr_wq_lock held
4383 if (net
->sctp
.default_auto_asconf
) {
4384 spin_lock(&sock_net(sk
)->sctp
.addr_wq_lock
);
4385 list_add_tail(&sp
->auto_asconf_list
,
4386 &net
->sctp
.auto_asconf_splist
);
4387 sp
->do_auto_asconf
= 1;
4388 spin_unlock(&sock_net(sk
)->sctp
.addr_wq_lock
);
4390 sp
->do_auto_asconf
= 0;
4398 /* Cleanup any SCTP per socket resources. Must be called with
4399 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4401 static void sctp_destroy_sock(struct sock
*sk
)
4403 struct sctp_sock
*sp
;
4405 pr_debug("%s: sk:%p\n", __func__
, sk
);
4407 /* Release our hold on the endpoint. */
4409 /* This could happen during socket init, thus we bail out
4410 * early, since the rest of the below is not setup either.
4415 if (sp
->do_auto_asconf
) {
4416 sp
->do_auto_asconf
= 0;
4417 list_del(&sp
->auto_asconf_list
);
4419 sctp_endpoint_free(sp
->ep
);
4421 percpu_counter_dec(&sctp_sockets_allocated
);
4422 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
4426 /* Triggered when there are no references on the socket anymore */
4427 static void sctp_destruct_sock(struct sock
*sk
)
4429 struct sctp_sock
*sp
= sctp_sk(sk
);
4431 /* Free up the HMAC transform. */
4432 crypto_free_shash(sp
->hmac
);
4434 inet_sock_destruct(sk
);
4437 /* API 4.1.7 shutdown() - TCP Style Syntax
4438 * int shutdown(int socket, int how);
4440 * sd - the socket descriptor of the association to be closed.
4441 * how - Specifies the type of shutdown. The values are
4444 * Disables further receive operations. No SCTP
4445 * protocol action is taken.
4447 * Disables further send operations, and initiates
4448 * the SCTP shutdown sequence.
4450 * Disables further send and receive operations
4451 * and initiates the SCTP shutdown sequence.
4453 static void sctp_shutdown(struct sock
*sk
, int how
)
4455 struct net
*net
= sock_net(sk
);
4456 struct sctp_endpoint
*ep
;
4458 if (!sctp_style(sk
, TCP
))
4461 ep
= sctp_sk(sk
)->ep
;
4462 if (how
& SEND_SHUTDOWN
&& !list_empty(&ep
->asocs
)) {
4463 struct sctp_association
*asoc
;
4465 sk
->sk_state
= SCTP_SS_CLOSING
;
4466 asoc
= list_entry(ep
->asocs
.next
,
4467 struct sctp_association
, asocs
);
4468 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
4472 int sctp_get_sctp_info(struct sock
*sk
, struct sctp_association
*asoc
,
4473 struct sctp_info
*info
)
4475 struct sctp_transport
*prim
;
4476 struct list_head
*pos
;
4479 memset(info
, 0, sizeof(*info
));
4481 struct sctp_sock
*sp
= sctp_sk(sk
);
4483 info
->sctpi_s_autoclose
= sp
->autoclose
;
4484 info
->sctpi_s_adaptation_ind
= sp
->adaptation_ind
;
4485 info
->sctpi_s_pd_point
= sp
->pd_point
;
4486 info
->sctpi_s_nodelay
= sp
->nodelay
;
4487 info
->sctpi_s_disable_fragments
= sp
->disable_fragments
;
4488 info
->sctpi_s_v4mapped
= sp
->v4mapped
;
4489 info
->sctpi_s_frag_interleave
= sp
->frag_interleave
;
4490 info
->sctpi_s_type
= sp
->type
;
4495 info
->sctpi_tag
= asoc
->c
.my_vtag
;
4496 info
->sctpi_state
= asoc
->state
;
4497 info
->sctpi_rwnd
= asoc
->a_rwnd
;
4498 info
->sctpi_unackdata
= asoc
->unack_data
;
4499 info
->sctpi_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4500 info
->sctpi_instrms
= asoc
->stream
->incnt
;
4501 info
->sctpi_outstrms
= asoc
->stream
->outcnt
;
4502 list_for_each(pos
, &asoc
->base
.inqueue
.in_chunk_list
)
4503 info
->sctpi_inqueue
++;
4504 list_for_each(pos
, &asoc
->outqueue
.out_chunk_list
)
4505 info
->sctpi_outqueue
++;
4506 info
->sctpi_overall_error
= asoc
->overall_error_count
;
4507 info
->sctpi_max_burst
= asoc
->max_burst
;
4508 info
->sctpi_maxseg
= asoc
->frag_point
;
4509 info
->sctpi_peer_rwnd
= asoc
->peer
.rwnd
;
4510 info
->sctpi_peer_tag
= asoc
->c
.peer_vtag
;
4512 mask
= asoc
->peer
.ecn_capable
<< 1;
4513 mask
= (mask
| asoc
->peer
.ipv4_address
) << 1;
4514 mask
= (mask
| asoc
->peer
.ipv6_address
) << 1;
4515 mask
= (mask
| asoc
->peer
.hostname_address
) << 1;
4516 mask
= (mask
| asoc
->peer
.asconf_capable
) << 1;
4517 mask
= (mask
| asoc
->peer
.prsctp_capable
) << 1;
4518 mask
= (mask
| asoc
->peer
.auth_capable
);
4519 info
->sctpi_peer_capable
= mask
;
4520 mask
= asoc
->peer
.sack_needed
<< 1;
4521 mask
= (mask
| asoc
->peer
.sack_generation
) << 1;
4522 mask
= (mask
| asoc
->peer
.zero_window_announced
);
4523 info
->sctpi_peer_sack
= mask
;
4525 info
->sctpi_isacks
= asoc
->stats
.isacks
;
4526 info
->sctpi_osacks
= asoc
->stats
.osacks
;
4527 info
->sctpi_opackets
= asoc
->stats
.opackets
;
4528 info
->sctpi_ipackets
= asoc
->stats
.ipackets
;
4529 info
->sctpi_rtxchunks
= asoc
->stats
.rtxchunks
;
4530 info
->sctpi_outofseqtsns
= asoc
->stats
.outofseqtsns
;
4531 info
->sctpi_idupchunks
= asoc
->stats
.idupchunks
;
4532 info
->sctpi_gapcnt
= asoc
->stats
.gapcnt
;
4533 info
->sctpi_ouodchunks
= asoc
->stats
.ouodchunks
;
4534 info
->sctpi_iuodchunks
= asoc
->stats
.iuodchunks
;
4535 info
->sctpi_oodchunks
= asoc
->stats
.oodchunks
;
4536 info
->sctpi_iodchunks
= asoc
->stats
.iodchunks
;
4537 info
->sctpi_octrlchunks
= asoc
->stats
.octrlchunks
;
4538 info
->sctpi_ictrlchunks
= asoc
->stats
.ictrlchunks
;
4540 prim
= asoc
->peer
.primary_path
;
4541 memcpy(&info
->sctpi_p_address
, &prim
->ipaddr
,
4542 sizeof(struct sockaddr_storage
));
4543 info
->sctpi_p_state
= prim
->state
;
4544 info
->sctpi_p_cwnd
= prim
->cwnd
;
4545 info
->sctpi_p_srtt
= prim
->srtt
;
4546 info
->sctpi_p_rto
= jiffies_to_msecs(prim
->rto
);
4547 info
->sctpi_p_hbinterval
= prim
->hbinterval
;
4548 info
->sctpi_p_pathmaxrxt
= prim
->pathmaxrxt
;
4549 info
->sctpi_p_sackdelay
= jiffies_to_msecs(prim
->sackdelay
);
4550 info
->sctpi_p_ssthresh
= prim
->ssthresh
;
4551 info
->sctpi_p_partial_bytes_acked
= prim
->partial_bytes_acked
;
4552 info
->sctpi_p_flight_size
= prim
->flight_size
;
4553 info
->sctpi_p_error
= prim
->error_count
;
4557 EXPORT_SYMBOL_GPL(sctp_get_sctp_info
);
4559 /* use callback to avoid exporting the core structure */
4560 int sctp_transport_walk_start(struct rhashtable_iter
*iter
)
4564 rhltable_walk_enter(&sctp_transport_hashtable
, iter
);
4566 err
= rhashtable_walk_start(iter
);
4567 if (err
&& err
!= -EAGAIN
) {
4568 rhashtable_walk_stop(iter
);
4569 rhashtable_walk_exit(iter
);
4576 void sctp_transport_walk_stop(struct rhashtable_iter
*iter
)
4578 rhashtable_walk_stop(iter
);
4579 rhashtable_walk_exit(iter
);
4582 struct sctp_transport
*sctp_transport_get_next(struct net
*net
,
4583 struct rhashtable_iter
*iter
)
4585 struct sctp_transport
*t
;
4587 t
= rhashtable_walk_next(iter
);
4588 for (; t
; t
= rhashtable_walk_next(iter
)) {
4590 if (PTR_ERR(t
) == -EAGAIN
)
4595 if (net_eq(sock_net(t
->asoc
->base
.sk
), net
) &&
4596 t
->asoc
->peer
.primary_path
== t
)
4603 struct sctp_transport
*sctp_transport_get_idx(struct net
*net
,
4604 struct rhashtable_iter
*iter
,
4607 void *obj
= SEQ_START_TOKEN
;
4609 while (pos
&& (obj
= sctp_transport_get_next(net
, iter
)) &&
4616 int sctp_for_each_endpoint(int (*cb
)(struct sctp_endpoint
*, void *),
4620 struct sctp_ep_common
*epb
;
4621 struct sctp_hashbucket
*head
;
4623 for (head
= sctp_ep_hashtable
; hash
< sctp_ep_hashsize
;
4625 read_lock(&head
->lock
);
4626 sctp_for_each_hentry(epb
, &head
->chain
) {
4627 err
= cb(sctp_ep(epb
), p
);
4631 read_unlock(&head
->lock
);
4636 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint
);
4638 int sctp_transport_lookup_process(int (*cb
)(struct sctp_transport
*, void *),
4640 const union sctp_addr
*laddr
,
4641 const union sctp_addr
*paddr
, void *p
)
4643 struct sctp_transport
*transport
;
4647 transport
= sctp_addrs_lookup_transport(net
, laddr
, paddr
);
4652 err
= cb(transport
, p
);
4653 sctp_transport_put(transport
);
4657 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process
);
4659 int sctp_for_each_transport(int (*cb
)(struct sctp_transport
*, void *),
4660 struct net
*net
, int pos
, void *p
) {
4661 struct rhashtable_iter hti
;
4665 err
= sctp_transport_walk_start(&hti
);
4669 sctp_transport_get_idx(net
, &hti
, pos
);
4670 obj
= sctp_transport_get_next(net
, &hti
);
4671 for (; obj
&& !IS_ERR(obj
); obj
= sctp_transport_get_next(net
, &hti
)) {
4672 struct sctp_transport
*transport
= obj
;
4674 if (!sctp_transport_hold(transport
))
4676 err
= cb(transport
, p
);
4677 sctp_transport_put(transport
);
4681 sctp_transport_walk_stop(&hti
);
4685 EXPORT_SYMBOL_GPL(sctp_for_each_transport
);
4687 /* 7.2.1 Association Status (SCTP_STATUS)
4689 * Applications can retrieve current status information about an
4690 * association, including association state, peer receiver window size,
4691 * number of unacked data chunks, and number of data chunks pending
4692 * receipt. This information is read-only.
4694 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
4695 char __user
*optval
,
4698 struct sctp_status status
;
4699 struct sctp_association
*asoc
= NULL
;
4700 struct sctp_transport
*transport
;
4701 sctp_assoc_t associd
;
4704 if (len
< sizeof(status
)) {
4709 len
= sizeof(status
);
4710 if (copy_from_user(&status
, optval
, len
)) {
4715 associd
= status
.sstat_assoc_id
;
4716 asoc
= sctp_id2assoc(sk
, associd
);
4722 transport
= asoc
->peer
.primary_path
;
4724 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
4725 status
.sstat_state
= sctp_assoc_to_state(asoc
);
4726 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
4727 status
.sstat_unackdata
= asoc
->unack_data
;
4729 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4730 status
.sstat_instrms
= asoc
->stream
->incnt
;
4731 status
.sstat_outstrms
= asoc
->stream
->outcnt
;
4732 status
.sstat_fragmentation_point
= asoc
->frag_point
;
4733 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4734 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
4735 transport
->af_specific
->sockaddr_len
);
4736 /* Map ipv4 address into v4-mapped-on-v6 address. */
4737 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sctp_sk(sk
),
4738 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
4739 status
.sstat_primary
.spinfo_state
= transport
->state
;
4740 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
4741 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
4742 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4743 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
4745 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
4746 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
4748 if (put_user(len
, optlen
)) {
4753 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4754 __func__
, len
, status
.sstat_state
, status
.sstat_rwnd
,
4755 status
.sstat_assoc_id
);
4757 if (copy_to_user(optval
, &status
, len
)) {
4767 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4769 * Applications can retrieve information about a specific peer address
4770 * of an association, including its reachability state, congestion
4771 * window, and retransmission timer values. This information is
4774 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
4775 char __user
*optval
,
4778 struct sctp_paddrinfo pinfo
;
4779 struct sctp_transport
*transport
;
4782 if (len
< sizeof(pinfo
)) {
4787 len
= sizeof(pinfo
);
4788 if (copy_from_user(&pinfo
, optval
, len
)) {
4793 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
4794 pinfo
.spinfo_assoc_id
);
4798 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4799 pinfo
.spinfo_state
= transport
->state
;
4800 pinfo
.spinfo_cwnd
= transport
->cwnd
;
4801 pinfo
.spinfo_srtt
= transport
->srtt
;
4802 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4803 pinfo
.spinfo_mtu
= transport
->pathmtu
;
4805 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
4806 pinfo
.spinfo_state
= SCTP_ACTIVE
;
4808 if (put_user(len
, optlen
)) {
4813 if (copy_to_user(optval
, &pinfo
, len
)) {
4822 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4824 * This option is a on/off flag. If enabled no SCTP message
4825 * fragmentation will be performed. Instead if a message being sent
4826 * exceeds the current PMTU size, the message will NOT be sent and
4827 * instead a error will be indicated to the user.
4829 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
4830 char __user
*optval
, int __user
*optlen
)
4834 if (len
< sizeof(int))
4838 val
= (sctp_sk(sk
)->disable_fragments
== 1);
4839 if (put_user(len
, optlen
))
4841 if (copy_to_user(optval
, &val
, len
))
4846 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4848 * This socket option is used to specify various notifications and
4849 * ancillary data the user wishes to receive.
4851 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
4856 if (len
> sizeof(struct sctp_event_subscribe
))
4857 len
= sizeof(struct sctp_event_subscribe
);
4858 if (put_user(len
, optlen
))
4860 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
4865 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4867 * This socket option is applicable to the UDP-style socket only. When
4868 * set it will cause associations that are idle for more than the
4869 * specified number of seconds to automatically close. An association
4870 * being idle is defined an association that has NOT sent or received
4871 * user data. The special value of '0' indicates that no automatic
4872 * close of any associations should be performed. The option expects an
4873 * integer defining the number of seconds of idle time before an
4874 * association is closed.
4876 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4878 /* Applicable to UDP-style socket only */
4879 if (sctp_style(sk
, TCP
))
4881 if (len
< sizeof(int))
4884 if (put_user(len
, optlen
))
4886 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
4891 /* Helper routine to branch off an association to a new socket. */
4892 int sctp_do_peeloff(struct sock
*sk
, sctp_assoc_t id
, struct socket
**sockp
)
4894 struct sctp_association
*asoc
= sctp_id2assoc(sk
, id
);
4895 struct sctp_sock
*sp
= sctp_sk(sk
);
4896 struct socket
*sock
;
4902 /* If there is a thread waiting on more sndbuf space for
4903 * sending on this asoc, it cannot be peeled.
4905 if (waitqueue_active(&asoc
->wait
))
4908 /* An association cannot be branched off from an already peeled-off
4909 * socket, nor is this supported for tcp style sockets.
4911 if (!sctp_style(sk
, UDP
))
4914 /* Create a new socket. */
4915 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
4919 sctp_copy_sock(sock
->sk
, sk
, asoc
);
4921 /* Make peeled-off sockets more like 1-1 accepted sockets.
4922 * Set the daddr and initialize id to something more random
4924 sp
->pf
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
4926 /* Populate the fields of the newsk from the oldsk and migrate the
4927 * asoc to the newsk.
4929 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
4935 EXPORT_SYMBOL(sctp_do_peeloff
);
4937 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4939 sctp_peeloff_arg_t peeloff
;
4940 struct socket
*newsock
;
4941 struct file
*newfile
;
4944 if (len
< sizeof(sctp_peeloff_arg_t
))
4946 len
= sizeof(sctp_peeloff_arg_t
);
4947 if (copy_from_user(&peeloff
, optval
, len
))
4950 retval
= sctp_do_peeloff(sk
, peeloff
.associd
, &newsock
);
4954 /* Map the socket to an unused fd that can be returned to the user. */
4955 retval
= get_unused_fd_flags(0);
4957 sock_release(newsock
);
4961 newfile
= sock_alloc_file(newsock
, 0, NULL
);
4962 if (IS_ERR(newfile
)) {
4963 put_unused_fd(retval
);
4964 sock_release(newsock
);
4965 return PTR_ERR(newfile
);
4968 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__
, sk
, newsock
->sk
,
4971 /* Return the fd mapped to the new socket. */
4972 if (put_user(len
, optlen
)) {
4974 put_unused_fd(retval
);
4977 peeloff
.sd
= retval
;
4978 if (copy_to_user(optval
, &peeloff
, len
)) {
4980 put_unused_fd(retval
);
4983 fd_install(retval
, newfile
);
4988 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4990 * Applications can enable or disable heartbeats for any peer address of
4991 * an association, modify an address's heartbeat interval, force a
4992 * heartbeat to be sent immediately, and adjust the address's maximum
4993 * number of retransmissions sent before an address is considered
4994 * unreachable. The following structure is used to access and modify an
4995 * address's parameters:
4997 * struct sctp_paddrparams {
4998 * sctp_assoc_t spp_assoc_id;
4999 * struct sockaddr_storage spp_address;
5000 * uint32_t spp_hbinterval;
5001 * uint16_t spp_pathmaxrxt;
5002 * uint32_t spp_pathmtu;
5003 * uint32_t spp_sackdelay;
5004 * uint32_t spp_flags;
5007 * spp_assoc_id - (one-to-many style socket) This is filled in the
5008 * application, and identifies the association for
5010 * spp_address - This specifies which address is of interest.
5011 * spp_hbinterval - This contains the value of the heartbeat interval,
5012 * in milliseconds. If a value of zero
5013 * is present in this field then no changes are to
5014 * be made to this parameter.
5015 * spp_pathmaxrxt - This contains the maximum number of
5016 * retransmissions before this address shall be
5017 * considered unreachable. If a value of zero
5018 * is present in this field then no changes are to
5019 * be made to this parameter.
5020 * spp_pathmtu - When Path MTU discovery is disabled the value
5021 * specified here will be the "fixed" path mtu.
5022 * Note that if the spp_address field is empty
5023 * then all associations on this address will
5024 * have this fixed path mtu set upon them.
5026 * spp_sackdelay - When delayed sack is enabled, this value specifies
5027 * the number of milliseconds that sacks will be delayed
5028 * for. This value will apply to all addresses of an
5029 * association if the spp_address field is empty. Note
5030 * also, that if delayed sack is enabled and this
5031 * value is set to 0, no change is made to the last
5032 * recorded delayed sack timer value.
5034 * spp_flags - These flags are used to control various features
5035 * on an association. The flag field may contain
5036 * zero or more of the following options.
5038 * SPP_HB_ENABLE - Enable heartbeats on the
5039 * specified address. Note that if the address
5040 * field is empty all addresses for the association
5041 * have heartbeats enabled upon them.
5043 * SPP_HB_DISABLE - Disable heartbeats on the
5044 * speicifed address. Note that if the address
5045 * field is empty all addresses for the association
5046 * will have their heartbeats disabled. Note also
5047 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5048 * mutually exclusive, only one of these two should
5049 * be specified. Enabling both fields will have
5050 * undetermined results.
5052 * SPP_HB_DEMAND - Request a user initiated heartbeat
5053 * to be made immediately.
5055 * SPP_PMTUD_ENABLE - This field will enable PMTU
5056 * discovery upon the specified address. Note that
5057 * if the address feild is empty then all addresses
5058 * on the association are effected.
5060 * SPP_PMTUD_DISABLE - This field will disable PMTU
5061 * discovery upon the specified address. Note that
5062 * if the address feild is empty then all addresses
5063 * on the association are effected. Not also that
5064 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5065 * exclusive. Enabling both will have undetermined
5068 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5069 * on delayed sack. The time specified in spp_sackdelay
5070 * is used to specify the sack delay for this address. Note
5071 * that if spp_address is empty then all addresses will
5072 * enable delayed sack and take on the sack delay
5073 * value specified in spp_sackdelay.
5074 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5075 * off delayed sack. If the spp_address field is blank then
5076 * delayed sack is disabled for the entire association. Note
5077 * also that this field is mutually exclusive to
5078 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5081 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
5082 char __user
*optval
, int __user
*optlen
)
5084 struct sctp_paddrparams params
;
5085 struct sctp_transport
*trans
= NULL
;
5086 struct sctp_association
*asoc
= NULL
;
5087 struct sctp_sock
*sp
= sctp_sk(sk
);
5089 if (len
< sizeof(struct sctp_paddrparams
))
5091 len
= sizeof(struct sctp_paddrparams
);
5092 if (copy_from_user(¶ms
, optval
, len
))
5095 /* If an address other than INADDR_ANY is specified, and
5096 * no transport is found, then the request is invalid.
5098 if (!sctp_is_any(sk
, (union sctp_addr
*)¶ms
.spp_address
)) {
5099 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
5100 params
.spp_assoc_id
);
5102 pr_debug("%s: failed no transport\n", __func__
);
5107 /* Get association, if assoc_id != 0 and the socket is a one
5108 * to many style socket, and an association was not found, then
5109 * the id was invalid.
5111 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
5112 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
5113 pr_debug("%s: failed no association\n", __func__
);
5118 /* Fetch transport values. */
5119 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
5120 params
.spp_pathmtu
= trans
->pathmtu
;
5121 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
5122 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
5124 /*draft-11 doesn't say what to return in spp_flags*/
5125 params
.spp_flags
= trans
->param_flags
;
5127 /* Fetch association values. */
5128 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
5129 params
.spp_pathmtu
= asoc
->pathmtu
;
5130 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
5131 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
5133 /*draft-11 doesn't say what to return in spp_flags*/
5134 params
.spp_flags
= asoc
->param_flags
;
5136 /* Fetch socket values. */
5137 params
.spp_hbinterval
= sp
->hbinterval
;
5138 params
.spp_pathmtu
= sp
->pathmtu
;
5139 params
.spp_sackdelay
= sp
->sackdelay
;
5140 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
5142 /*draft-11 doesn't say what to return in spp_flags*/
5143 params
.spp_flags
= sp
->param_flags
;
5146 if (copy_to_user(optval
, ¶ms
, len
))
5149 if (put_user(len
, optlen
))
5156 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5158 * This option will effect the way delayed acks are performed. This
5159 * option allows you to get or set the delayed ack time, in
5160 * milliseconds. It also allows changing the delayed ack frequency.
5161 * Changing the frequency to 1 disables the delayed sack algorithm. If
5162 * the assoc_id is 0, then this sets or gets the endpoints default
5163 * values. If the assoc_id field is non-zero, then the set or get
5164 * effects the specified association for the one to many model (the
5165 * assoc_id field is ignored by the one to one model). Note that if
5166 * sack_delay or sack_freq are 0 when setting this option, then the
5167 * current values will remain unchanged.
5169 * struct sctp_sack_info {
5170 * sctp_assoc_t sack_assoc_id;
5171 * uint32_t sack_delay;
5172 * uint32_t sack_freq;
5175 * sack_assoc_id - This parameter, indicates which association the user
5176 * is performing an action upon. Note that if this field's value is
5177 * zero then the endpoints default value is changed (effecting future
5178 * associations only).
5180 * sack_delay - This parameter contains the number of milliseconds that
5181 * the user is requesting the delayed ACK timer be set to. Note that
5182 * this value is defined in the standard to be between 200 and 500
5185 * sack_freq - This parameter contains the number of packets that must
5186 * be received before a sack is sent without waiting for the delay
5187 * timer to expire. The default value for this is 2, setting this
5188 * value to 1 will disable the delayed sack algorithm.
5190 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
5191 char __user
*optval
,
5194 struct sctp_sack_info params
;
5195 struct sctp_association
*asoc
= NULL
;
5196 struct sctp_sock
*sp
= sctp_sk(sk
);
5198 if (len
>= sizeof(struct sctp_sack_info
)) {
5199 len
= sizeof(struct sctp_sack_info
);
5201 if (copy_from_user(¶ms
, optval
, len
))
5203 } else if (len
== sizeof(struct sctp_assoc_value
)) {
5204 pr_warn_ratelimited(DEPRECATED
5206 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5207 "Use struct sctp_sack_info instead\n",
5208 current
->comm
, task_pid_nr(current
));
5209 if (copy_from_user(¶ms
, optval
, len
))
5214 /* Get association, if sack_assoc_id != 0 and the socket is a one
5215 * to many style socket, and an association was not found, then
5216 * the id was invalid.
5218 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
5219 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
5223 /* Fetch association values. */
5224 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
5225 params
.sack_delay
= jiffies_to_msecs(
5227 params
.sack_freq
= asoc
->sackfreq
;
5230 params
.sack_delay
= 0;
5231 params
.sack_freq
= 1;
5234 /* Fetch socket values. */
5235 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
5236 params
.sack_delay
= sp
->sackdelay
;
5237 params
.sack_freq
= sp
->sackfreq
;
5239 params
.sack_delay
= 0;
5240 params
.sack_freq
= 1;
5244 if (copy_to_user(optval
, ¶ms
, len
))
5247 if (put_user(len
, optlen
))
5253 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5255 * Applications can specify protocol parameters for the default association
5256 * initialization. The option name argument to setsockopt() and getsockopt()
5259 * Setting initialization parameters is effective only on an unconnected
5260 * socket (for UDP-style sockets only future associations are effected
5261 * by the change). With TCP-style sockets, this option is inherited by
5262 * sockets derived from a listener socket.
5264 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
5266 if (len
< sizeof(struct sctp_initmsg
))
5268 len
= sizeof(struct sctp_initmsg
);
5269 if (put_user(len
, optlen
))
5271 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
5277 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
5278 char __user
*optval
, int __user
*optlen
)
5280 struct sctp_association
*asoc
;
5282 struct sctp_getaddrs getaddrs
;
5283 struct sctp_transport
*from
;
5285 union sctp_addr temp
;
5286 struct sctp_sock
*sp
= sctp_sk(sk
);
5291 if (len
< sizeof(struct sctp_getaddrs
))
5294 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
5297 /* For UDP-style sockets, id specifies the association to query. */
5298 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
5302 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
5303 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
5305 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
5307 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
5308 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5309 ->addr_to_user(sp
, &temp
);
5310 if (space_left
< addrlen
)
5312 if (copy_to_user(to
, &temp
, addrlen
))
5316 space_left
-= addrlen
;
5319 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
5321 bytes_copied
= ((char __user
*)to
) - optval
;
5322 if (put_user(bytes_copied
, optlen
))
5328 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
5329 size_t space_left
, int *bytes_copied
)
5331 struct sctp_sockaddr_entry
*addr
;
5332 union sctp_addr temp
;
5335 struct net
*net
= sock_net(sk
);
5338 list_for_each_entry_rcu(addr
, &net
->sctp
.local_addr_list
, list
) {
5342 if ((PF_INET
== sk
->sk_family
) &&
5343 (AF_INET6
== addr
->a
.sa
.sa_family
))
5345 if ((PF_INET6
== sk
->sk_family
) &&
5346 inet_v6_ipv6only(sk
) &&
5347 (AF_INET
== addr
->a
.sa
.sa_family
))
5349 memcpy(&temp
, &addr
->a
, sizeof(temp
));
5350 if (!temp
.v4
.sin_port
)
5351 temp
.v4
.sin_port
= htons(port
);
5353 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5354 ->addr_to_user(sctp_sk(sk
), &temp
);
5356 if (space_left
< addrlen
) {
5360 memcpy(to
, &temp
, addrlen
);
5364 space_left
-= addrlen
;
5365 *bytes_copied
+= addrlen
;
5373 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
5374 char __user
*optval
, int __user
*optlen
)
5376 struct sctp_bind_addr
*bp
;
5377 struct sctp_association
*asoc
;
5379 struct sctp_getaddrs getaddrs
;
5380 struct sctp_sockaddr_entry
*addr
;
5382 union sctp_addr temp
;
5383 struct sctp_sock
*sp
= sctp_sk(sk
);
5387 int bytes_copied
= 0;
5391 if (len
< sizeof(struct sctp_getaddrs
))
5394 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
5398 * For UDP-style sockets, id specifies the association to query.
5399 * If the id field is set to the value '0' then the locally bound
5400 * addresses are returned without regard to any particular
5403 if (0 == getaddrs
.assoc_id
) {
5404 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
5406 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
5409 bp
= &asoc
->base
.bind_addr
;
5412 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
5413 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
5415 addrs
= kmalloc(space_left
, GFP_USER
| __GFP_NOWARN
);
5419 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5420 * addresses from the global local address list.
5422 if (sctp_list_single_entry(&bp
->address_list
)) {
5423 addr
= list_entry(bp
->address_list
.next
,
5424 struct sctp_sockaddr_entry
, list
);
5425 if (sctp_is_any(sk
, &addr
->a
)) {
5426 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
5427 space_left
, &bytes_copied
);
5437 /* Protection on the bound address list is not needed since
5438 * in the socket option context we hold a socket lock and
5439 * thus the bound address list can't change.
5441 list_for_each_entry(addr
, &bp
->address_list
, list
) {
5442 memcpy(&temp
, &addr
->a
, sizeof(temp
));
5443 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5444 ->addr_to_user(sp
, &temp
);
5445 if (space_left
< addrlen
) {
5446 err
= -ENOMEM
; /*fixme: right error?*/
5449 memcpy(buf
, &temp
, addrlen
);
5451 bytes_copied
+= addrlen
;
5453 space_left
-= addrlen
;
5457 if (copy_to_user(to
, addrs
, bytes_copied
)) {
5461 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
5465 if (put_user(bytes_copied
, optlen
))
5472 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5474 * Requests that the local SCTP stack use the enclosed peer address as
5475 * the association primary. The enclosed address must be one of the
5476 * association peer's addresses.
5478 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
5479 char __user
*optval
, int __user
*optlen
)
5481 struct sctp_prim prim
;
5482 struct sctp_association
*asoc
;
5483 struct sctp_sock
*sp
= sctp_sk(sk
);
5485 if (len
< sizeof(struct sctp_prim
))
5488 len
= sizeof(struct sctp_prim
);
5490 if (copy_from_user(&prim
, optval
, len
))
5493 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
5497 if (!asoc
->peer
.primary_path
)
5500 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
5501 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
5503 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sp
,
5504 (union sctp_addr
*)&prim
.ssp_addr
);
5506 if (put_user(len
, optlen
))
5508 if (copy_to_user(optval
, &prim
, len
))
5515 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5517 * Requests that the local endpoint set the specified Adaptation Layer
5518 * Indication parameter for all future INIT and INIT-ACK exchanges.
5520 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
5521 char __user
*optval
, int __user
*optlen
)
5523 struct sctp_setadaptation adaptation
;
5525 if (len
< sizeof(struct sctp_setadaptation
))
5528 len
= sizeof(struct sctp_setadaptation
);
5530 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
5532 if (put_user(len
, optlen
))
5534 if (copy_to_user(optval
, &adaptation
, len
))
5542 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5544 * Applications that wish to use the sendto() system call may wish to
5545 * specify a default set of parameters that would normally be supplied
5546 * through the inclusion of ancillary data. This socket option allows
5547 * such an application to set the default sctp_sndrcvinfo structure.
5550 * The application that wishes to use this socket option simply passes
5551 * in to this call the sctp_sndrcvinfo structure defined in Section
5552 * 5.2.2) The input parameters accepted by this call include
5553 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5554 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5555 * to this call if the caller is using the UDP model.
5557 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5559 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
5560 int len
, char __user
*optval
,
5563 struct sctp_sock
*sp
= sctp_sk(sk
);
5564 struct sctp_association
*asoc
;
5565 struct sctp_sndrcvinfo info
;
5567 if (len
< sizeof(info
))
5572 if (copy_from_user(&info
, optval
, len
))
5575 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
5576 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
5579 info
.sinfo_stream
= asoc
->default_stream
;
5580 info
.sinfo_flags
= asoc
->default_flags
;
5581 info
.sinfo_ppid
= asoc
->default_ppid
;
5582 info
.sinfo_context
= asoc
->default_context
;
5583 info
.sinfo_timetolive
= asoc
->default_timetolive
;
5585 info
.sinfo_stream
= sp
->default_stream
;
5586 info
.sinfo_flags
= sp
->default_flags
;
5587 info
.sinfo_ppid
= sp
->default_ppid
;
5588 info
.sinfo_context
= sp
->default_context
;
5589 info
.sinfo_timetolive
= sp
->default_timetolive
;
5592 if (put_user(len
, optlen
))
5594 if (copy_to_user(optval
, &info
, len
))
5600 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5601 * (SCTP_DEFAULT_SNDINFO)
5603 static int sctp_getsockopt_default_sndinfo(struct sock
*sk
, int len
,
5604 char __user
*optval
,
5607 struct sctp_sock
*sp
= sctp_sk(sk
);
5608 struct sctp_association
*asoc
;
5609 struct sctp_sndinfo info
;
5611 if (len
< sizeof(info
))
5616 if (copy_from_user(&info
, optval
, len
))
5619 asoc
= sctp_id2assoc(sk
, info
.snd_assoc_id
);
5620 if (!asoc
&& info
.snd_assoc_id
&& sctp_style(sk
, UDP
))
5623 info
.snd_sid
= asoc
->default_stream
;
5624 info
.snd_flags
= asoc
->default_flags
;
5625 info
.snd_ppid
= asoc
->default_ppid
;
5626 info
.snd_context
= asoc
->default_context
;
5628 info
.snd_sid
= sp
->default_stream
;
5629 info
.snd_flags
= sp
->default_flags
;
5630 info
.snd_ppid
= sp
->default_ppid
;
5631 info
.snd_context
= sp
->default_context
;
5634 if (put_user(len
, optlen
))
5636 if (copy_to_user(optval
, &info
, len
))
5644 * 7.1.5 SCTP_NODELAY
5646 * Turn on/off any Nagle-like algorithm. This means that packets are
5647 * generally sent as soon as possible and no unnecessary delays are
5648 * introduced, at the cost of more packets in the network. Expects an
5649 * integer boolean flag.
5652 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
5653 char __user
*optval
, int __user
*optlen
)
5657 if (len
< sizeof(int))
5661 val
= (sctp_sk(sk
)->nodelay
== 1);
5662 if (put_user(len
, optlen
))
5664 if (copy_to_user(optval
, &val
, len
))
5671 * 7.1.1 SCTP_RTOINFO
5673 * The protocol parameters used to initialize and bound retransmission
5674 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5675 * and modify these parameters.
5676 * All parameters are time values, in milliseconds. A value of 0, when
5677 * modifying the parameters, indicates that the current value should not
5681 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
5682 char __user
*optval
,
5683 int __user
*optlen
) {
5684 struct sctp_rtoinfo rtoinfo
;
5685 struct sctp_association
*asoc
;
5687 if (len
< sizeof (struct sctp_rtoinfo
))
5690 len
= sizeof(struct sctp_rtoinfo
);
5692 if (copy_from_user(&rtoinfo
, optval
, len
))
5695 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
5697 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
5700 /* Values corresponding to the specific association. */
5702 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
5703 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
5704 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
5706 /* Values corresponding to the endpoint. */
5707 struct sctp_sock
*sp
= sctp_sk(sk
);
5709 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
5710 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
5711 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
5714 if (put_user(len
, optlen
))
5717 if (copy_to_user(optval
, &rtoinfo
, len
))
5725 * 7.1.2 SCTP_ASSOCINFO
5727 * This option is used to tune the maximum retransmission attempts
5728 * of the association.
5729 * Returns an error if the new association retransmission value is
5730 * greater than the sum of the retransmission value of the peer.
5731 * See [SCTP] for more information.
5734 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
5735 char __user
*optval
,
5739 struct sctp_assocparams assocparams
;
5740 struct sctp_association
*asoc
;
5741 struct list_head
*pos
;
5744 if (len
< sizeof (struct sctp_assocparams
))
5747 len
= sizeof(struct sctp_assocparams
);
5749 if (copy_from_user(&assocparams
, optval
, len
))
5752 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
5754 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
5757 /* Values correspoinding to the specific association */
5759 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
5760 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
5761 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
5762 assocparams
.sasoc_cookie_life
= ktime_to_ms(asoc
->cookie_life
);
5764 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
5768 assocparams
.sasoc_number_peer_destinations
= cnt
;
5770 /* Values corresponding to the endpoint */
5771 struct sctp_sock
*sp
= sctp_sk(sk
);
5773 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
5774 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
5775 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
5776 assocparams
.sasoc_cookie_life
=
5777 sp
->assocparams
.sasoc_cookie_life
;
5778 assocparams
.sasoc_number_peer_destinations
=
5780 sasoc_number_peer_destinations
;
5783 if (put_user(len
, optlen
))
5786 if (copy_to_user(optval
, &assocparams
, len
))
5793 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5795 * This socket option is a boolean flag which turns on or off mapped V4
5796 * addresses. If this option is turned on and the socket is type
5797 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5798 * If this option is turned off, then no mapping will be done of V4
5799 * addresses and a user will receive both PF_INET6 and PF_INET type
5800 * addresses on the socket.
5802 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
5803 char __user
*optval
, int __user
*optlen
)
5806 struct sctp_sock
*sp
= sctp_sk(sk
);
5808 if (len
< sizeof(int))
5813 if (put_user(len
, optlen
))
5815 if (copy_to_user(optval
, &val
, len
))
5822 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5823 * (chapter and verse is quoted at sctp_setsockopt_context())
5825 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
5826 char __user
*optval
, int __user
*optlen
)
5828 struct sctp_assoc_value params
;
5829 struct sctp_sock
*sp
;
5830 struct sctp_association
*asoc
;
5832 if (len
< sizeof(struct sctp_assoc_value
))
5835 len
= sizeof(struct sctp_assoc_value
);
5837 if (copy_from_user(¶ms
, optval
, len
))
5842 if (params
.assoc_id
!= 0) {
5843 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5846 params
.assoc_value
= asoc
->default_rcv_context
;
5848 params
.assoc_value
= sp
->default_rcv_context
;
5851 if (put_user(len
, optlen
))
5853 if (copy_to_user(optval
, ¶ms
, len
))
5860 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5861 * This option will get or set the maximum size to put in any outgoing
5862 * SCTP DATA chunk. If a message is larger than this size it will be
5863 * fragmented by SCTP into the specified size. Note that the underlying
5864 * SCTP implementation may fragment into smaller sized chunks when the
5865 * PMTU of the underlying association is smaller than the value set by
5866 * the user. The default value for this option is '0' which indicates
5867 * the user is NOT limiting fragmentation and only the PMTU will effect
5868 * SCTP's choice of DATA chunk size. Note also that values set larger
5869 * than the maximum size of an IP datagram will effectively let SCTP
5870 * control fragmentation (i.e. the same as setting this option to 0).
5872 * The following structure is used to access and modify this parameter:
5874 * struct sctp_assoc_value {
5875 * sctp_assoc_t assoc_id;
5876 * uint32_t assoc_value;
5879 * assoc_id: This parameter is ignored for one-to-one style sockets.
5880 * For one-to-many style sockets this parameter indicates which
5881 * association the user is performing an action upon. Note that if
5882 * this field's value is zero then the endpoints default value is
5883 * changed (effecting future associations only).
5884 * assoc_value: This parameter specifies the maximum size in bytes.
5886 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
5887 char __user
*optval
, int __user
*optlen
)
5889 struct sctp_assoc_value params
;
5890 struct sctp_association
*asoc
;
5892 if (len
== sizeof(int)) {
5893 pr_warn_ratelimited(DEPRECATED
5895 "Use of int in maxseg socket option.\n"
5896 "Use struct sctp_assoc_value instead\n",
5897 current
->comm
, task_pid_nr(current
));
5898 params
.assoc_id
= 0;
5899 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5900 len
= sizeof(struct sctp_assoc_value
);
5901 if (copy_from_user(¶ms
, optval
, sizeof(params
)))
5906 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5907 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
5911 params
.assoc_value
= asoc
->frag_point
;
5913 params
.assoc_value
= sctp_sk(sk
)->user_frag
;
5915 if (put_user(len
, optlen
))
5917 if (len
== sizeof(int)) {
5918 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5921 if (copy_to_user(optval
, ¶ms
, len
))
5929 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5930 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5932 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
5933 char __user
*optval
, int __user
*optlen
)
5937 if (len
< sizeof(int))
5942 val
= sctp_sk(sk
)->frag_interleave
;
5943 if (put_user(len
, optlen
))
5945 if (copy_to_user(optval
, &val
, len
))
5952 * 7.1.25. Set or Get the sctp partial delivery point
5953 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5955 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
5956 char __user
*optval
,
5961 if (len
< sizeof(u32
))
5966 val
= sctp_sk(sk
)->pd_point
;
5967 if (put_user(len
, optlen
))
5969 if (copy_to_user(optval
, &val
, len
))
5976 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5977 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5979 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
5980 char __user
*optval
,
5983 struct sctp_assoc_value params
;
5984 struct sctp_sock
*sp
;
5985 struct sctp_association
*asoc
;
5987 if (len
== sizeof(int)) {
5988 pr_warn_ratelimited(DEPRECATED
5990 "Use of int in max_burst socket option.\n"
5991 "Use struct sctp_assoc_value instead\n",
5992 current
->comm
, task_pid_nr(current
));
5993 params
.assoc_id
= 0;
5994 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5995 len
= sizeof(struct sctp_assoc_value
);
5996 if (copy_from_user(¶ms
, optval
, len
))
6003 if (params
.assoc_id
!= 0) {
6004 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6007 params
.assoc_value
= asoc
->max_burst
;
6009 params
.assoc_value
= sp
->max_burst
;
6011 if (len
== sizeof(int)) {
6012 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
6015 if (copy_to_user(optval
, ¶ms
, len
))
6023 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
6024 char __user
*optval
, int __user
*optlen
)
6026 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6027 struct sctp_hmacalgo __user
*p
= (void __user
*)optval
;
6028 struct sctp_hmac_algo_param
*hmacs
;
6033 if (!ep
->auth_enable
)
6036 hmacs
= ep
->auth_hmacs_list
;
6037 data_len
= ntohs(hmacs
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
6039 if (len
< sizeof(struct sctp_hmacalgo
) + data_len
)
6042 len
= sizeof(struct sctp_hmacalgo
) + data_len
;
6043 num_idents
= data_len
/ sizeof(u16
);
6045 if (put_user(len
, optlen
))
6047 if (put_user(num_idents
, &p
->shmac_num_idents
))
6049 for (i
= 0; i
< num_idents
; i
++) {
6050 __u16 hmacid
= ntohs(hmacs
->hmac_ids
[i
]);
6052 if (copy_to_user(&p
->shmac_idents
[i
], &hmacid
, sizeof(__u16
)))
6058 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
6059 char __user
*optval
, int __user
*optlen
)
6061 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6062 struct sctp_authkeyid val
;
6063 struct sctp_association
*asoc
;
6065 if (!ep
->auth_enable
)
6068 if (len
< sizeof(struct sctp_authkeyid
))
6070 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
6073 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
6074 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
6078 val
.scact_keynumber
= asoc
->active_key_id
;
6080 val
.scact_keynumber
= ep
->active_key_id
;
6082 len
= sizeof(struct sctp_authkeyid
);
6083 if (put_user(len
, optlen
))
6085 if (copy_to_user(optval
, &val
, len
))
6091 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
6092 char __user
*optval
, int __user
*optlen
)
6094 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6095 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
6096 struct sctp_authchunks val
;
6097 struct sctp_association
*asoc
;
6098 struct sctp_chunks_param
*ch
;
6102 if (!ep
->auth_enable
)
6105 if (len
< sizeof(struct sctp_authchunks
))
6108 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
6111 to
= p
->gauth_chunks
;
6112 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
6116 ch
= asoc
->peer
.peer_chunks
;
6120 /* See if the user provided enough room for all the data */
6121 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
6122 if (len
< num_chunks
)
6125 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
6128 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
6129 if (put_user(len
, optlen
))
6131 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
6136 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
6137 char __user
*optval
, int __user
*optlen
)
6139 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6140 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
6141 struct sctp_authchunks val
;
6142 struct sctp_association
*asoc
;
6143 struct sctp_chunks_param
*ch
;
6147 if (!ep
->auth_enable
)
6150 if (len
< sizeof(struct sctp_authchunks
))
6153 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
6156 to
= p
->gauth_chunks
;
6157 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
6158 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
6162 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
6164 ch
= ep
->auth_chunk_list
;
6169 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(sctp_paramhdr_t
);
6170 if (len
< sizeof(struct sctp_authchunks
) + num_chunks
)
6173 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
6176 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
6177 if (put_user(len
, optlen
))
6179 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
6186 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6187 * This option gets the current number of associations that are attached
6188 * to a one-to-many style socket. The option value is an uint32_t.
6190 static int sctp_getsockopt_assoc_number(struct sock
*sk
, int len
,
6191 char __user
*optval
, int __user
*optlen
)
6193 struct sctp_sock
*sp
= sctp_sk(sk
);
6194 struct sctp_association
*asoc
;
6197 if (sctp_style(sk
, TCP
))
6200 if (len
< sizeof(u32
))
6205 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6209 if (put_user(len
, optlen
))
6211 if (copy_to_user(optval
, &val
, len
))
6218 * 8.1.23 SCTP_AUTO_ASCONF
6219 * See the corresponding setsockopt entry as description
6221 static int sctp_getsockopt_auto_asconf(struct sock
*sk
, int len
,
6222 char __user
*optval
, int __user
*optlen
)
6226 if (len
< sizeof(int))
6230 if (sctp_sk(sk
)->do_auto_asconf
&& sctp_is_ep_boundall(sk
))
6232 if (put_user(len
, optlen
))
6234 if (copy_to_user(optval
, &val
, len
))
6240 * 8.2.6. Get the Current Identifiers of Associations
6241 * (SCTP_GET_ASSOC_ID_LIST)
6243 * This option gets the current list of SCTP association identifiers of
6244 * the SCTP associations handled by a one-to-many style socket.
6246 static int sctp_getsockopt_assoc_ids(struct sock
*sk
, int len
,
6247 char __user
*optval
, int __user
*optlen
)
6249 struct sctp_sock
*sp
= sctp_sk(sk
);
6250 struct sctp_association
*asoc
;
6251 struct sctp_assoc_ids
*ids
;
6254 if (sctp_style(sk
, TCP
))
6257 if (len
< sizeof(struct sctp_assoc_ids
))
6260 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6264 if (len
< sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
)
6267 len
= sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
;
6269 ids
= kmalloc(len
, GFP_USER
| __GFP_NOWARN
);
6273 ids
->gaids_number_of_ids
= num
;
6275 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6276 ids
->gaids_assoc_id
[num
++] = asoc
->assoc_id
;
6279 if (put_user(len
, optlen
) || copy_to_user(optval
, ids
, len
)) {
6289 * SCTP_PEER_ADDR_THLDS
6291 * This option allows us to fetch the partially failed threshold for one or all
6292 * transports in an association. See Section 6.1 of:
6293 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6295 static int sctp_getsockopt_paddr_thresholds(struct sock
*sk
,
6296 char __user
*optval
,
6300 struct sctp_paddrthlds val
;
6301 struct sctp_transport
*trans
;
6302 struct sctp_association
*asoc
;
6304 if (len
< sizeof(struct sctp_paddrthlds
))
6306 len
= sizeof(struct sctp_paddrthlds
);
6307 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
, len
))
6310 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
6311 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
6315 val
.spt_pathpfthld
= asoc
->pf_retrans
;
6316 val
.spt_pathmaxrxt
= asoc
->pathmaxrxt
;
6318 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
6323 val
.spt_pathmaxrxt
= trans
->pathmaxrxt
;
6324 val
.spt_pathpfthld
= trans
->pf_retrans
;
6327 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
6334 * SCTP_GET_ASSOC_STATS
6336 * This option retrieves local per endpoint statistics. It is modeled
6337 * after OpenSolaris' implementation
6339 static int sctp_getsockopt_assoc_stats(struct sock
*sk
, int len
,
6340 char __user
*optval
,
6343 struct sctp_assoc_stats sas
;
6344 struct sctp_association
*asoc
= NULL
;
6346 /* User must provide at least the assoc id */
6347 if (len
< sizeof(sctp_assoc_t
))
6350 /* Allow the struct to grow and fill in as much as possible */
6351 len
= min_t(size_t, len
, sizeof(sas
));
6353 if (copy_from_user(&sas
, optval
, len
))
6356 asoc
= sctp_id2assoc(sk
, sas
.sas_assoc_id
);
6360 sas
.sas_rtxchunks
= asoc
->stats
.rtxchunks
;
6361 sas
.sas_gapcnt
= asoc
->stats
.gapcnt
;
6362 sas
.sas_outofseqtsns
= asoc
->stats
.outofseqtsns
;
6363 sas
.sas_osacks
= asoc
->stats
.osacks
;
6364 sas
.sas_isacks
= asoc
->stats
.isacks
;
6365 sas
.sas_octrlchunks
= asoc
->stats
.octrlchunks
;
6366 sas
.sas_ictrlchunks
= asoc
->stats
.ictrlchunks
;
6367 sas
.sas_oodchunks
= asoc
->stats
.oodchunks
;
6368 sas
.sas_iodchunks
= asoc
->stats
.iodchunks
;
6369 sas
.sas_ouodchunks
= asoc
->stats
.ouodchunks
;
6370 sas
.sas_iuodchunks
= asoc
->stats
.iuodchunks
;
6371 sas
.sas_idupchunks
= asoc
->stats
.idupchunks
;
6372 sas
.sas_opackets
= asoc
->stats
.opackets
;
6373 sas
.sas_ipackets
= asoc
->stats
.ipackets
;
6375 /* New high max rto observed, will return 0 if not a single
6376 * RTO update took place. obs_rto_ipaddr will be bogus
6379 sas
.sas_maxrto
= asoc
->stats
.max_obs_rto
;
6380 memcpy(&sas
.sas_obs_rto_ipaddr
, &asoc
->stats
.obs_rto_ipaddr
,
6381 sizeof(struct sockaddr_storage
));
6383 /* Mark beginning of a new observation period */
6384 asoc
->stats
.max_obs_rto
= asoc
->rto_min
;
6386 if (put_user(len
, optlen
))
6389 pr_debug("%s: len:%d, assoc_id:%d\n", __func__
, len
, sas
.sas_assoc_id
);
6391 if (copy_to_user(optval
, &sas
, len
))
6397 static int sctp_getsockopt_recvrcvinfo(struct sock
*sk
, int len
,
6398 char __user
*optval
,
6403 if (len
< sizeof(int))
6407 if (sctp_sk(sk
)->recvrcvinfo
)
6409 if (put_user(len
, optlen
))
6411 if (copy_to_user(optval
, &val
, len
))
6417 static int sctp_getsockopt_recvnxtinfo(struct sock
*sk
, int len
,
6418 char __user
*optval
,
6423 if (len
< sizeof(int))
6427 if (sctp_sk(sk
)->recvnxtinfo
)
6429 if (put_user(len
, optlen
))
6431 if (copy_to_user(optval
, &val
, len
))
6437 static int sctp_getsockopt_pr_supported(struct sock
*sk
, int len
,
6438 char __user
*optval
,
6441 struct sctp_assoc_value params
;
6442 struct sctp_association
*asoc
;
6443 int retval
= -EFAULT
;
6445 if (len
< sizeof(params
)) {
6450 len
= sizeof(params
);
6451 if (copy_from_user(¶ms
, optval
, len
))
6454 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6456 params
.assoc_value
= asoc
->prsctp_enable
;
6457 } else if (!params
.assoc_id
) {
6458 struct sctp_sock
*sp
= sctp_sk(sk
);
6460 params
.assoc_value
= sp
->ep
->prsctp_enable
;
6466 if (put_user(len
, optlen
))
6469 if (copy_to_user(optval
, ¶ms
, len
))
6478 static int sctp_getsockopt_default_prinfo(struct sock
*sk
, int len
,
6479 char __user
*optval
,
6482 struct sctp_default_prinfo info
;
6483 struct sctp_association
*asoc
;
6484 int retval
= -EFAULT
;
6486 if (len
< sizeof(info
)) {
6492 if (copy_from_user(&info
, optval
, len
))
6495 asoc
= sctp_id2assoc(sk
, info
.pr_assoc_id
);
6497 info
.pr_policy
= SCTP_PR_POLICY(asoc
->default_flags
);
6498 info
.pr_value
= asoc
->default_timetolive
;
6499 } else if (!info
.pr_assoc_id
) {
6500 struct sctp_sock
*sp
= sctp_sk(sk
);
6502 info
.pr_policy
= SCTP_PR_POLICY(sp
->default_flags
);
6503 info
.pr_value
= sp
->default_timetolive
;
6509 if (put_user(len
, optlen
))
6512 if (copy_to_user(optval
, &info
, len
))
6521 static int sctp_getsockopt_pr_assocstatus(struct sock
*sk
, int len
,
6522 char __user
*optval
,
6525 struct sctp_prstatus params
;
6526 struct sctp_association
*asoc
;
6528 int retval
= -EINVAL
;
6530 if (len
< sizeof(params
))
6533 len
= sizeof(params
);
6534 if (copy_from_user(¶ms
, optval
, len
)) {
6539 policy
= params
.sprstat_policy
;
6540 if (policy
& ~SCTP_PR_SCTP_MASK
)
6543 asoc
= sctp_id2assoc(sk
, params
.sprstat_assoc_id
);
6547 if (policy
== SCTP_PR_SCTP_NONE
) {
6548 params
.sprstat_abandoned_unsent
= 0;
6549 params
.sprstat_abandoned_sent
= 0;
6550 for (policy
= 0; policy
<= SCTP_PR_INDEX(MAX
); policy
++) {
6551 params
.sprstat_abandoned_unsent
+=
6552 asoc
->abandoned_unsent
[policy
];
6553 params
.sprstat_abandoned_sent
+=
6554 asoc
->abandoned_sent
[policy
];
6557 params
.sprstat_abandoned_unsent
=
6558 asoc
->abandoned_unsent
[__SCTP_PR_INDEX(policy
)];
6559 params
.sprstat_abandoned_sent
=
6560 asoc
->abandoned_sent
[__SCTP_PR_INDEX(policy
)];
6563 if (put_user(len
, optlen
)) {
6568 if (copy_to_user(optval
, ¶ms
, len
)) {
6579 static int sctp_getsockopt_pr_streamstatus(struct sock
*sk
, int len
,
6580 char __user
*optval
,
6583 struct sctp_stream_out
*streamout
;
6584 struct sctp_association
*asoc
;
6585 struct sctp_prstatus params
;
6586 int retval
= -EINVAL
;
6589 if (len
< sizeof(params
))
6592 len
= sizeof(params
);
6593 if (copy_from_user(¶ms
, optval
, len
)) {
6598 policy
= params
.sprstat_policy
;
6599 if (policy
& ~SCTP_PR_SCTP_MASK
)
6602 asoc
= sctp_id2assoc(sk
, params
.sprstat_assoc_id
);
6603 if (!asoc
|| params
.sprstat_sid
>= asoc
->stream
->outcnt
)
6606 streamout
= &asoc
->stream
->out
[params
.sprstat_sid
];
6607 if (policy
== SCTP_PR_SCTP_NONE
) {
6608 params
.sprstat_abandoned_unsent
= 0;
6609 params
.sprstat_abandoned_sent
= 0;
6610 for (policy
= 0; policy
<= SCTP_PR_INDEX(MAX
); policy
++) {
6611 params
.sprstat_abandoned_unsent
+=
6612 streamout
->abandoned_unsent
[policy
];
6613 params
.sprstat_abandoned_sent
+=
6614 streamout
->abandoned_sent
[policy
];
6617 params
.sprstat_abandoned_unsent
=
6618 streamout
->abandoned_unsent
[__SCTP_PR_INDEX(policy
)];
6619 params
.sprstat_abandoned_sent
=
6620 streamout
->abandoned_sent
[__SCTP_PR_INDEX(policy
)];
6623 if (put_user(len
, optlen
) || copy_to_user(optval
, ¶ms
, len
)) {
6634 static int sctp_getsockopt_reconfig_supported(struct sock
*sk
, int len
,
6635 char __user
*optval
,
6638 struct sctp_assoc_value params
;
6639 struct sctp_association
*asoc
;
6640 int retval
= -EFAULT
;
6642 if (len
< sizeof(params
)) {
6647 len
= sizeof(params
);
6648 if (copy_from_user(¶ms
, optval
, len
))
6651 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6653 params
.assoc_value
= asoc
->reconf_enable
;
6654 } else if (!params
.assoc_id
) {
6655 struct sctp_sock
*sp
= sctp_sk(sk
);
6657 params
.assoc_value
= sp
->ep
->reconf_enable
;
6663 if (put_user(len
, optlen
))
6666 if (copy_to_user(optval
, ¶ms
, len
))
6675 static int sctp_getsockopt_enable_strreset(struct sock
*sk
, int len
,
6676 char __user
*optval
,
6679 struct sctp_assoc_value params
;
6680 struct sctp_association
*asoc
;
6681 int retval
= -EFAULT
;
6683 if (len
< sizeof(params
)) {
6688 len
= sizeof(params
);
6689 if (copy_from_user(¶ms
, optval
, len
))
6692 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6694 params
.assoc_value
= asoc
->strreset_enable
;
6695 } else if (!params
.assoc_id
) {
6696 struct sctp_sock
*sp
= sctp_sk(sk
);
6698 params
.assoc_value
= sp
->ep
->strreset_enable
;
6704 if (put_user(len
, optlen
))
6707 if (copy_to_user(optval
, ¶ms
, len
))
6716 static int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
6717 char __user
*optval
, int __user
*optlen
)
6722 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
6724 /* I can hardly begin to describe how wrong this is. This is
6725 * so broken as to be worse than useless. The API draft
6726 * REALLY is NOT helpful here... I am not convinced that the
6727 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
6728 * are at all well-founded.
6730 if (level
!= SOL_SCTP
) {
6731 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
6733 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
6737 if (get_user(len
, optlen
))
6747 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
6749 case SCTP_DISABLE_FRAGMENTS
:
6750 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
6754 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
6756 case SCTP_AUTOCLOSE
:
6757 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
6759 case SCTP_SOCKOPT_PEELOFF
:
6760 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
6762 case SCTP_PEER_ADDR_PARAMS
:
6763 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
6766 case SCTP_DELAYED_SACK
:
6767 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
6771 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
6773 case SCTP_GET_PEER_ADDRS
:
6774 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
6777 case SCTP_GET_LOCAL_ADDRS
:
6778 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
6781 case SCTP_SOCKOPT_CONNECTX3
:
6782 retval
= sctp_getsockopt_connectx3(sk
, len
, optval
, optlen
);
6784 case SCTP_DEFAULT_SEND_PARAM
:
6785 retval
= sctp_getsockopt_default_send_param(sk
, len
,
6788 case SCTP_DEFAULT_SNDINFO
:
6789 retval
= sctp_getsockopt_default_sndinfo(sk
, len
,
6792 case SCTP_PRIMARY_ADDR
:
6793 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
6796 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
6799 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
6801 case SCTP_ASSOCINFO
:
6802 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
6804 case SCTP_I_WANT_MAPPED_V4_ADDR
:
6805 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
6808 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
6810 case SCTP_GET_PEER_ADDR_INFO
:
6811 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
6814 case SCTP_ADAPTATION_LAYER
:
6815 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
6819 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
6821 case SCTP_FRAGMENT_INTERLEAVE
:
6822 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
6825 case SCTP_PARTIAL_DELIVERY_POINT
:
6826 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
6829 case SCTP_MAX_BURST
:
6830 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
6833 case SCTP_AUTH_CHUNK
:
6834 case SCTP_AUTH_DELETE_KEY
:
6835 retval
= -EOPNOTSUPP
;
6837 case SCTP_HMAC_IDENT
:
6838 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
6840 case SCTP_AUTH_ACTIVE_KEY
:
6841 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
6843 case SCTP_PEER_AUTH_CHUNKS
:
6844 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
6847 case SCTP_LOCAL_AUTH_CHUNKS
:
6848 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
6851 case SCTP_GET_ASSOC_NUMBER
:
6852 retval
= sctp_getsockopt_assoc_number(sk
, len
, optval
, optlen
);
6854 case SCTP_GET_ASSOC_ID_LIST
:
6855 retval
= sctp_getsockopt_assoc_ids(sk
, len
, optval
, optlen
);
6857 case SCTP_AUTO_ASCONF
:
6858 retval
= sctp_getsockopt_auto_asconf(sk
, len
, optval
, optlen
);
6860 case SCTP_PEER_ADDR_THLDS
:
6861 retval
= sctp_getsockopt_paddr_thresholds(sk
, optval
, len
, optlen
);
6863 case SCTP_GET_ASSOC_STATS
:
6864 retval
= sctp_getsockopt_assoc_stats(sk
, len
, optval
, optlen
);
6866 case SCTP_RECVRCVINFO
:
6867 retval
= sctp_getsockopt_recvrcvinfo(sk
, len
, optval
, optlen
);
6869 case SCTP_RECVNXTINFO
:
6870 retval
= sctp_getsockopt_recvnxtinfo(sk
, len
, optval
, optlen
);
6872 case SCTP_PR_SUPPORTED
:
6873 retval
= sctp_getsockopt_pr_supported(sk
, len
, optval
, optlen
);
6875 case SCTP_DEFAULT_PRINFO
:
6876 retval
= sctp_getsockopt_default_prinfo(sk
, len
, optval
,
6879 case SCTP_PR_ASSOC_STATUS
:
6880 retval
= sctp_getsockopt_pr_assocstatus(sk
, len
, optval
,
6883 case SCTP_PR_STREAM_STATUS
:
6884 retval
= sctp_getsockopt_pr_streamstatus(sk
, len
, optval
,
6887 case SCTP_RECONFIG_SUPPORTED
:
6888 retval
= sctp_getsockopt_reconfig_supported(sk
, len
, optval
,
6891 case SCTP_ENABLE_STREAM_RESET
:
6892 retval
= sctp_getsockopt_enable_strreset(sk
, len
, optval
,
6896 retval
= -ENOPROTOOPT
;
6904 static int sctp_hash(struct sock
*sk
)
6910 static void sctp_unhash(struct sock
*sk
)
6915 /* Check if port is acceptable. Possibly find first available port.
6917 * The port hash table (contained in the 'global' SCTP protocol storage
6918 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6919 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6920 * list (the list number is the port number hashed out, so as you
6921 * would expect from a hash function, all the ports in a given list have
6922 * such a number that hashes out to the same list number; you were
6923 * expecting that, right?); so each list has a set of ports, with a
6924 * link to the socket (struct sock) that uses it, the port number and
6925 * a fastreuse flag (FIXME: NPI ipg).
6927 static struct sctp_bind_bucket
*sctp_bucket_create(
6928 struct sctp_bind_hashbucket
*head
, struct net
*, unsigned short snum
);
6930 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
6932 struct sctp_bind_hashbucket
*head
; /* hash list */
6933 struct sctp_bind_bucket
*pp
;
6934 unsigned short snum
;
6937 snum
= ntohs(addr
->v4
.sin_port
);
6939 pr_debug("%s: begins, snum:%d\n", __func__
, snum
);
6944 /* Search for an available port. */
6945 int low
, high
, remaining
, index
;
6947 struct net
*net
= sock_net(sk
);
6949 inet_get_local_port_range(net
, &low
, &high
);
6950 remaining
= (high
- low
) + 1;
6951 rover
= prandom_u32() % remaining
+ low
;
6955 if ((rover
< low
) || (rover
> high
))
6957 if (inet_is_local_reserved_port(net
, rover
))
6959 index
= sctp_phashfn(sock_net(sk
), rover
);
6960 head
= &sctp_port_hashtable
[index
];
6961 spin_lock(&head
->lock
);
6962 sctp_for_each_hentry(pp
, &head
->chain
)
6963 if ((pp
->port
== rover
) &&
6964 net_eq(sock_net(sk
), pp
->net
))
6968 spin_unlock(&head
->lock
);
6969 } while (--remaining
> 0);
6971 /* Exhausted local port range during search? */
6976 /* OK, here is the one we will use. HEAD (the port
6977 * hash table list entry) is non-NULL and we hold it's
6982 /* We are given an specific port number; we verify
6983 * that it is not being used. If it is used, we will
6984 * exahust the search in the hash list corresponding
6985 * to the port number (snum) - we detect that with the
6986 * port iterator, pp being NULL.
6988 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
), snum
)];
6989 spin_lock(&head
->lock
);
6990 sctp_for_each_hentry(pp
, &head
->chain
) {
6991 if ((pp
->port
== snum
) && net_eq(pp
->net
, sock_net(sk
)))
6998 if (!hlist_empty(&pp
->owner
)) {
6999 /* We had a port hash table hit - there is an
7000 * available port (pp != NULL) and it is being
7001 * used by other socket (pp->owner not empty); that other
7002 * socket is going to be sk2.
7004 int reuse
= sk
->sk_reuse
;
7007 pr_debug("%s: found a possible match\n", __func__
);
7009 if (pp
->fastreuse
&& sk
->sk_reuse
&&
7010 sk
->sk_state
!= SCTP_SS_LISTENING
)
7013 /* Run through the list of sockets bound to the port
7014 * (pp->port) [via the pointers bind_next and
7015 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
7016 * we get the endpoint they describe and run through
7017 * the endpoint's list of IP (v4 or v6) addresses,
7018 * comparing each of the addresses with the address of
7019 * the socket sk. If we find a match, then that means
7020 * that this port/socket (sk) combination are already
7023 sk_for_each_bound(sk2
, &pp
->owner
) {
7024 struct sctp_endpoint
*ep2
;
7025 ep2
= sctp_sk(sk2
)->ep
;
7028 (reuse
&& sk2
->sk_reuse
&&
7029 sk2
->sk_state
!= SCTP_SS_LISTENING
))
7032 if (sctp_bind_addr_conflict(&ep2
->base
.bind_addr
, addr
,
7033 sctp_sk(sk2
), sctp_sk(sk
))) {
7039 pr_debug("%s: found a match\n", __func__
);
7042 /* If there was a hash table miss, create a new port. */
7044 if (!pp
&& !(pp
= sctp_bucket_create(head
, sock_net(sk
), snum
)))
7047 /* In either case (hit or miss), make sure fastreuse is 1 only
7048 * if sk->sk_reuse is too (that is, if the caller requested
7049 * SO_REUSEADDR on this socket -sk-).
7051 if (hlist_empty(&pp
->owner
)) {
7052 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
7056 } else if (pp
->fastreuse
&&
7057 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
7060 /* We are set, so fill up all the data in the hash table
7061 * entry, tie the socket list information with the rest of the
7062 * sockets FIXME: Blurry, NPI (ipg).
7065 if (!sctp_sk(sk
)->bind_hash
) {
7066 inet_sk(sk
)->inet_num
= snum
;
7067 sk_add_bind_node(sk
, &pp
->owner
);
7068 sctp_sk(sk
)->bind_hash
= pp
;
7073 spin_unlock(&head
->lock
);
7080 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
7081 * port is requested.
7083 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
7085 union sctp_addr addr
;
7086 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
7088 /* Set up a dummy address struct from the sk. */
7089 af
->from_sk(&addr
, sk
);
7090 addr
.v4
.sin_port
= htons(snum
);
7092 /* Note: sk->sk_num gets filled in if ephemeral port request. */
7093 return !!sctp_get_port_local(sk
, &addr
);
7097 * Move a socket to LISTENING state.
7099 static int sctp_listen_start(struct sock
*sk
, int backlog
)
7101 struct sctp_sock
*sp
= sctp_sk(sk
);
7102 struct sctp_endpoint
*ep
= sp
->ep
;
7103 struct crypto_shash
*tfm
= NULL
;
7106 /* Allocate HMAC for generating cookie. */
7107 if (!sp
->hmac
&& sp
->sctp_hmac_alg
) {
7108 sprintf(alg
, "hmac(%s)", sp
->sctp_hmac_alg
);
7109 tfm
= crypto_alloc_shash(alg
, 0, 0);
7111 net_info_ratelimited("failed to load transform for %s: %ld\n",
7112 sp
->sctp_hmac_alg
, PTR_ERR(tfm
));
7115 sctp_sk(sk
)->hmac
= tfm
;
7119 * If a bind() or sctp_bindx() is not called prior to a listen()
7120 * call that allows new associations to be accepted, the system
7121 * picks an ephemeral port and will choose an address set equivalent
7122 * to binding with a wildcard address.
7124 * This is not currently spelled out in the SCTP sockets
7125 * extensions draft, but follows the practice as seen in TCP
7129 sk
->sk_state
= SCTP_SS_LISTENING
;
7130 if (!ep
->base
.bind_addr
.port
) {
7131 if (sctp_autobind(sk
))
7134 if (sctp_get_port(sk
, inet_sk(sk
)->inet_num
)) {
7135 sk
->sk_state
= SCTP_SS_CLOSED
;
7140 sk
->sk_max_ack_backlog
= backlog
;
7141 sctp_hash_endpoint(ep
);
7146 * 4.1.3 / 5.1.3 listen()
7148 * By default, new associations are not accepted for UDP style sockets.
7149 * An application uses listen() to mark a socket as being able to
7150 * accept new associations.
7152 * On TCP style sockets, applications use listen() to ready the SCTP
7153 * endpoint for accepting inbound associations.
7155 * On both types of endpoints a backlog of '0' disables listening.
7157 * Move a socket to LISTENING state.
7159 int sctp_inet_listen(struct socket
*sock
, int backlog
)
7161 struct sock
*sk
= sock
->sk
;
7162 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
7165 if (unlikely(backlog
< 0))
7170 /* Peeled-off sockets are not allowed to listen(). */
7171 if (sctp_style(sk
, UDP_HIGH_BANDWIDTH
))
7174 if (sock
->state
!= SS_UNCONNECTED
)
7177 if (!sctp_sstate(sk
, LISTENING
) && !sctp_sstate(sk
, CLOSED
))
7180 /* If backlog is zero, disable listening. */
7182 if (sctp_sstate(sk
, CLOSED
))
7186 sctp_unhash_endpoint(ep
);
7187 sk
->sk_state
= SCTP_SS_CLOSED
;
7189 sctp_sk(sk
)->bind_hash
->fastreuse
= 1;
7193 /* If we are already listening, just update the backlog */
7194 if (sctp_sstate(sk
, LISTENING
))
7195 sk
->sk_max_ack_backlog
= backlog
;
7197 err
= sctp_listen_start(sk
, backlog
);
7209 * This function is done by modeling the current datagram_poll() and the
7210 * tcp_poll(). Note that, based on these implementations, we don't
7211 * lock the socket in this function, even though it seems that,
7212 * ideally, locking or some other mechanisms can be used to ensure
7213 * the integrity of the counters (sndbuf and wmem_alloc) used
7214 * in this place. We assume that we don't need locks either until proven
7217 * Another thing to note is that we include the Async I/O support
7218 * here, again, by modeling the current TCP/UDP code. We don't have
7219 * a good way to test with it yet.
7221 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
7223 struct sock
*sk
= sock
->sk
;
7224 struct sctp_sock
*sp
= sctp_sk(sk
);
7227 poll_wait(file
, sk_sleep(sk
), wait
);
7229 sock_rps_record_flow(sk
);
7231 /* A TCP-style listening socket becomes readable when the accept queue
7234 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
7235 return (!list_empty(&sp
->ep
->asocs
)) ?
7236 (POLLIN
| POLLRDNORM
) : 0;
7240 /* Is there any exceptional events? */
7241 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
7243 (sock_flag(sk
, SOCK_SELECT_ERR_QUEUE
) ? POLLPRI
: 0);
7244 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7245 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
7246 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
7249 /* Is it readable? Reconsider this code with TCP-style support. */
7250 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7251 mask
|= POLLIN
| POLLRDNORM
;
7253 /* The association is either gone or not ready. */
7254 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
7257 /* Is it writable? */
7258 if (sctp_writeable(sk
)) {
7259 mask
|= POLLOUT
| POLLWRNORM
;
7261 sk_set_bit(SOCKWQ_ASYNC_NOSPACE
, sk
);
7263 * Since the socket is not locked, the buffer
7264 * might be made available after the writeable check and
7265 * before the bit is set. This could cause a lost I/O
7266 * signal. tcp_poll() has a race breaker for this race
7267 * condition. Based on their implementation, we put
7268 * in the following code to cover it as well.
7270 if (sctp_writeable(sk
))
7271 mask
|= POLLOUT
| POLLWRNORM
;
7276 /********************************************************************
7277 * 2nd Level Abstractions
7278 ********************************************************************/
7280 static struct sctp_bind_bucket
*sctp_bucket_create(
7281 struct sctp_bind_hashbucket
*head
, struct net
*net
, unsigned short snum
)
7283 struct sctp_bind_bucket
*pp
;
7285 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
7287 SCTP_DBG_OBJCNT_INC(bind_bucket
);
7290 INIT_HLIST_HEAD(&pp
->owner
);
7292 hlist_add_head(&pp
->node
, &head
->chain
);
7297 /* Caller must hold hashbucket lock for this tb with local BH disabled */
7298 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
7300 if (pp
&& hlist_empty(&pp
->owner
)) {
7301 __hlist_del(&pp
->node
);
7302 kmem_cache_free(sctp_bucket_cachep
, pp
);
7303 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
7307 /* Release this socket's reference to a local port. */
7308 static inline void __sctp_put_port(struct sock
*sk
)
7310 struct sctp_bind_hashbucket
*head
=
7311 &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
),
7312 inet_sk(sk
)->inet_num
)];
7313 struct sctp_bind_bucket
*pp
;
7315 spin_lock(&head
->lock
);
7316 pp
= sctp_sk(sk
)->bind_hash
;
7317 __sk_del_bind_node(sk
);
7318 sctp_sk(sk
)->bind_hash
= NULL
;
7319 inet_sk(sk
)->inet_num
= 0;
7320 sctp_bucket_destroy(pp
);
7321 spin_unlock(&head
->lock
);
7324 void sctp_put_port(struct sock
*sk
)
7327 __sctp_put_port(sk
);
7332 * The system picks an ephemeral port and choose an address set equivalent
7333 * to binding with a wildcard address.
7334 * One of those addresses will be the primary address for the association.
7335 * This automatically enables the multihoming capability of SCTP.
7337 static int sctp_autobind(struct sock
*sk
)
7339 union sctp_addr autoaddr
;
7343 /* Initialize a local sockaddr structure to INADDR_ANY. */
7344 af
= sctp_sk(sk
)->pf
->af
;
7346 port
= htons(inet_sk(sk
)->inet_num
);
7347 af
->inaddr_any(&autoaddr
, port
);
7349 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
7352 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
7355 * 4.2 The cmsghdr Structure *
7357 * When ancillary data is sent or received, any number of ancillary data
7358 * objects can be specified by the msg_control and msg_controllen members of
7359 * the msghdr structure, because each object is preceded by
7360 * a cmsghdr structure defining the object's length (the cmsg_len member).
7361 * Historically Berkeley-derived implementations have passed only one object
7362 * at a time, but this API allows multiple objects to be
7363 * passed in a single call to sendmsg() or recvmsg(). The following example
7364 * shows two ancillary data objects in a control buffer.
7366 * |<--------------------------- msg_controllen -------------------------->|
7369 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
7371 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
7374 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
7376 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
7379 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7380 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
7382 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
7384 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7391 static int sctp_msghdr_parse(const struct msghdr
*msg
, sctp_cmsgs_t
*cmsgs
)
7393 struct cmsghdr
*cmsg
;
7394 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
7396 for_each_cmsghdr(cmsg
, my_msg
) {
7397 if (!CMSG_OK(my_msg
, cmsg
))
7400 /* Should we parse this header or ignore? */
7401 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
7404 /* Strictly check lengths following example in SCM code. */
7405 switch (cmsg
->cmsg_type
) {
7407 /* SCTP Socket API Extension
7408 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
7410 * This cmsghdr structure provides information for
7411 * initializing new SCTP associations with sendmsg().
7412 * The SCTP_INITMSG socket option uses this same data
7413 * structure. This structure is not used for
7416 * cmsg_level cmsg_type cmsg_data[]
7417 * ------------ ------------ ----------------------
7418 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
7420 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_initmsg
)))
7423 cmsgs
->init
= CMSG_DATA(cmsg
);
7427 /* SCTP Socket API Extension
7428 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
7430 * This cmsghdr structure specifies SCTP options for
7431 * sendmsg() and describes SCTP header information
7432 * about a received message through recvmsg().
7434 * cmsg_level cmsg_type cmsg_data[]
7435 * ------------ ------------ ----------------------
7436 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
7438 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
7441 cmsgs
->srinfo
= CMSG_DATA(cmsg
);
7443 if (cmsgs
->srinfo
->sinfo_flags
&
7444 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
7445 SCTP_SACK_IMMEDIATELY
| SCTP_PR_SCTP_MASK
|
7446 SCTP_ABORT
| SCTP_EOF
))
7451 /* SCTP Socket API Extension
7452 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
7454 * This cmsghdr structure specifies SCTP options for
7455 * sendmsg(). This structure and SCTP_RCVINFO replaces
7456 * SCTP_SNDRCV which has been deprecated.
7458 * cmsg_level cmsg_type cmsg_data[]
7459 * ------------ ------------ ---------------------
7460 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
7462 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_sndinfo
)))
7465 cmsgs
->sinfo
= CMSG_DATA(cmsg
);
7467 if (cmsgs
->sinfo
->snd_flags
&
7468 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
7469 SCTP_SACK_IMMEDIATELY
| SCTP_PR_SCTP_MASK
|
7470 SCTP_ABORT
| SCTP_EOF
))
7482 * Wait for a packet..
7483 * Note: This function is the same function as in core/datagram.c
7484 * with a few modifications to make lksctp work.
7486 static int sctp_wait_for_packet(struct sock
*sk
, int *err
, long *timeo_p
)
7491 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
7493 /* Socket errors? */
7494 error
= sock_error(sk
);
7498 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7501 /* Socket shut down? */
7502 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7505 /* Sequenced packets can come disconnected. If so we report the
7510 /* Is there a good reason to think that we may receive some data? */
7511 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
7514 /* Handle signals. */
7515 if (signal_pending(current
))
7518 /* Let another process have a go. Since we are going to sleep
7519 * anyway. Note: This may cause odd behaviors if the message
7520 * does not fit in the user's buffer, but this seems to be the
7521 * only way to honor MSG_DONTWAIT realistically.
7524 *timeo_p
= schedule_timeout(*timeo_p
);
7528 finish_wait(sk_sleep(sk
), &wait
);
7532 error
= sock_intr_errno(*timeo_p
);
7535 finish_wait(sk_sleep(sk
), &wait
);
7540 /* Receive a datagram.
7541 * Note: This is pretty much the same routine as in core/datagram.c
7542 * with a few changes to make lksctp work.
7544 struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
7545 int noblock
, int *err
)
7548 struct sk_buff
*skb
;
7551 timeo
= sock_rcvtimeo(sk
, noblock
);
7553 pr_debug("%s: timeo:%ld, max:%ld\n", __func__
, timeo
,
7554 MAX_SCHEDULE_TIMEOUT
);
7557 /* Again only user level code calls this function,
7558 * so nothing interrupt level
7559 * will suddenly eat the receive_queue.
7561 * Look at current nfs client by the way...
7562 * However, this function was correct in any case. 8)
7564 if (flags
& MSG_PEEK
) {
7565 skb
= skb_peek(&sk
->sk_receive_queue
);
7567 atomic_inc(&skb
->users
);
7569 skb
= __skb_dequeue(&sk
->sk_receive_queue
);
7575 /* Caller is allowed not to check sk->sk_err before calling. */
7576 error
= sock_error(sk
);
7580 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7583 if (sk_can_busy_loop(sk
)) {
7584 sk_busy_loop(sk
, noblock
);
7586 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7590 /* User doesn't want to wait. */
7594 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
7603 /* If sndbuf has changed, wake up per association sndbuf waiters. */
7604 static void __sctp_write_space(struct sctp_association
*asoc
)
7606 struct sock
*sk
= asoc
->base
.sk
;
7608 if (sctp_wspace(asoc
) <= 0)
7611 if (waitqueue_active(&asoc
->wait
))
7612 wake_up_interruptible(&asoc
->wait
);
7614 if (sctp_writeable(sk
)) {
7615 struct socket_wq
*wq
;
7618 wq
= rcu_dereference(sk
->sk_wq
);
7620 if (waitqueue_active(&wq
->wait
))
7621 wake_up_interruptible(&wq
->wait
);
7623 /* Note that we try to include the Async I/O support
7624 * here by modeling from the current TCP/UDP code.
7625 * We have not tested with it yet.
7627 if (!(sk
->sk_shutdown
& SEND_SHUTDOWN
))
7628 sock_wake_async(wq
, SOCK_WAKE_SPACE
, POLL_OUT
);
7634 static void sctp_wake_up_waiters(struct sock
*sk
,
7635 struct sctp_association
*asoc
)
7637 struct sctp_association
*tmp
= asoc
;
7639 /* We do accounting for the sndbuf space per association,
7640 * so we only need to wake our own association.
7642 if (asoc
->ep
->sndbuf_policy
)
7643 return __sctp_write_space(asoc
);
7645 /* If association goes down and is just flushing its
7646 * outq, then just normally notify others.
7648 if (asoc
->base
.dead
)
7649 return sctp_write_space(sk
);
7651 /* Accounting for the sndbuf space is per socket, so we
7652 * need to wake up others, try to be fair and in case of
7653 * other associations, let them have a go first instead
7654 * of just doing a sctp_write_space() call.
7656 * Note that we reach sctp_wake_up_waiters() only when
7657 * associations free up queued chunks, thus we are under
7658 * lock and the list of associations on a socket is
7659 * guaranteed not to change.
7661 for (tmp
= list_next_entry(tmp
, asocs
); 1;
7662 tmp
= list_next_entry(tmp
, asocs
)) {
7663 /* Manually skip the head element. */
7664 if (&tmp
->asocs
== &((sctp_sk(sk
))->ep
->asocs
))
7666 /* Wake up association. */
7667 __sctp_write_space(tmp
);
7668 /* We've reached the end. */
7674 /* Do accounting for the sndbuf space.
7675 * Decrement the used sndbuf space of the corresponding association by the
7676 * data size which was just transmitted(freed).
7678 static void sctp_wfree(struct sk_buff
*skb
)
7680 struct sctp_chunk
*chunk
= skb_shinfo(skb
)->destructor_arg
;
7681 struct sctp_association
*asoc
= chunk
->asoc
;
7682 struct sock
*sk
= asoc
->base
.sk
;
7684 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
7685 sizeof(struct sk_buff
) +
7686 sizeof(struct sctp_chunk
);
7688 atomic_sub(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
7691 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
7693 sk
->sk_wmem_queued
-= skb
->truesize
;
7694 sk_mem_uncharge(sk
, skb
->truesize
);
7697 sctp_wake_up_waiters(sk
, asoc
);
7699 sctp_association_put(asoc
);
7702 /* Do accounting for the receive space on the socket.
7703 * Accounting for the association is done in ulpevent.c
7704 * We set this as a destructor for the cloned data skbs so that
7705 * accounting is done at the correct time.
7707 void sctp_sock_rfree(struct sk_buff
*skb
)
7709 struct sock
*sk
= skb
->sk
;
7710 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
7712 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
7715 * Mimic the behavior of sock_rfree
7717 sk_mem_uncharge(sk
, event
->rmem_len
);
7721 /* Helper function to wait for space in the sndbuf. */
7722 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
7725 struct sock
*sk
= asoc
->base
.sk
;
7727 long current_timeo
= *timeo_p
;
7730 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__
, asoc
,
7733 /* Increment the association's refcnt. */
7734 sctp_association_hold(asoc
);
7736 /* Wait on the association specific sndbuf space. */
7738 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
7739 TASK_INTERRUPTIBLE
);
7742 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
7745 if (signal_pending(current
))
7746 goto do_interrupted
;
7747 if (msg_len
<= sctp_wspace(asoc
))
7750 /* Let another process have a go. Since we are going
7754 current_timeo
= schedule_timeout(current_timeo
);
7757 *timeo_p
= current_timeo
;
7761 finish_wait(&asoc
->wait
, &wait
);
7763 /* Release the association's refcnt. */
7764 sctp_association_put(asoc
);
7773 err
= sock_intr_errno(*timeo_p
);
7781 void sctp_data_ready(struct sock
*sk
)
7783 struct socket_wq
*wq
;
7786 wq
= rcu_dereference(sk
->sk_wq
);
7787 if (skwq_has_sleeper(wq
))
7788 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
7789 POLLRDNORM
| POLLRDBAND
);
7790 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
7794 /* If socket sndbuf has changed, wake up all per association waiters. */
7795 void sctp_write_space(struct sock
*sk
)
7797 struct sctp_association
*asoc
;
7799 /* Wake up the tasks in each wait queue. */
7800 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
7801 __sctp_write_space(asoc
);
7805 /* Is there any sndbuf space available on the socket?
7807 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
7808 * associations on the same socket. For a UDP-style socket with
7809 * multiple associations, it is possible for it to be "unwriteable"
7810 * prematurely. I assume that this is acceptable because
7811 * a premature "unwriteable" is better than an accidental "writeable" which
7812 * would cause an unwanted block under certain circumstances. For the 1-1
7813 * UDP-style sockets or TCP-style sockets, this code should work.
7816 static int sctp_writeable(struct sock
*sk
)
7820 amt
= sk
->sk_sndbuf
- sk_wmem_alloc_get(sk
);
7826 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7827 * returns immediately with EINPROGRESS.
7829 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
7831 struct sock
*sk
= asoc
->base
.sk
;
7833 long current_timeo
= *timeo_p
;
7836 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__
, asoc
, *timeo_p
);
7838 /* Increment the association's refcnt. */
7839 sctp_association_hold(asoc
);
7842 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
7843 TASK_INTERRUPTIBLE
);
7846 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7848 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
7851 if (signal_pending(current
))
7852 goto do_interrupted
;
7854 if (sctp_state(asoc
, ESTABLISHED
))
7857 /* Let another process have a go. Since we are going
7861 current_timeo
= schedule_timeout(current_timeo
);
7864 *timeo_p
= current_timeo
;
7868 finish_wait(&asoc
->wait
, &wait
);
7870 /* Release the association's refcnt. */
7871 sctp_association_put(asoc
);
7876 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
7879 err
= -ECONNREFUSED
;
7883 err
= sock_intr_errno(*timeo_p
);
7891 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
7893 struct sctp_endpoint
*ep
;
7897 ep
= sctp_sk(sk
)->ep
;
7901 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
7902 TASK_INTERRUPTIBLE
);
7904 if (list_empty(&ep
->asocs
)) {
7906 timeo
= schedule_timeout(timeo
);
7911 if (!sctp_sstate(sk
, LISTENING
))
7915 if (!list_empty(&ep
->asocs
))
7918 err
= sock_intr_errno(timeo
);
7919 if (signal_pending(current
))
7927 finish_wait(sk_sleep(sk
), &wait
);
7932 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
7937 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
7938 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
7941 timeout
= schedule_timeout(timeout
);
7943 } while (!signal_pending(current
) && timeout
);
7945 finish_wait(sk_sleep(sk
), &wait
);
7948 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
7950 struct sk_buff
*frag
;
7955 /* Don't forget the fragments. */
7956 skb_walk_frags(skb
, frag
)
7957 sctp_skb_set_owner_r_frag(frag
, sk
);
7960 sctp_skb_set_owner_r(skb
, sk
);
7963 void sctp_copy_sock(struct sock
*newsk
, struct sock
*sk
,
7964 struct sctp_association
*asoc
)
7966 struct inet_sock
*inet
= inet_sk(sk
);
7967 struct inet_sock
*newinet
;
7969 newsk
->sk_type
= sk
->sk_type
;
7970 newsk
->sk_bound_dev_if
= sk
->sk_bound_dev_if
;
7971 newsk
->sk_flags
= sk
->sk_flags
;
7972 newsk
->sk_tsflags
= sk
->sk_tsflags
;
7973 newsk
->sk_no_check_tx
= sk
->sk_no_check_tx
;
7974 newsk
->sk_no_check_rx
= sk
->sk_no_check_rx
;
7975 newsk
->sk_reuse
= sk
->sk_reuse
;
7977 newsk
->sk_shutdown
= sk
->sk_shutdown
;
7978 newsk
->sk_destruct
= sctp_destruct_sock
;
7979 newsk
->sk_family
= sk
->sk_family
;
7980 newsk
->sk_protocol
= IPPROTO_SCTP
;
7981 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
7982 newsk
->sk_sndbuf
= sk
->sk_sndbuf
;
7983 newsk
->sk_rcvbuf
= sk
->sk_rcvbuf
;
7984 newsk
->sk_lingertime
= sk
->sk_lingertime
;
7985 newsk
->sk_rcvtimeo
= sk
->sk_rcvtimeo
;
7986 newsk
->sk_sndtimeo
= sk
->sk_sndtimeo
;
7987 newsk
->sk_rxhash
= sk
->sk_rxhash
;
7989 newinet
= inet_sk(newsk
);
7991 /* Initialize sk's sport, dport, rcv_saddr and daddr for
7992 * getsockname() and getpeername()
7994 newinet
->inet_sport
= inet
->inet_sport
;
7995 newinet
->inet_saddr
= inet
->inet_saddr
;
7996 newinet
->inet_rcv_saddr
= inet
->inet_rcv_saddr
;
7997 newinet
->inet_dport
= htons(asoc
->peer
.port
);
7998 newinet
->pmtudisc
= inet
->pmtudisc
;
7999 newinet
->inet_id
= asoc
->next_tsn
^ jiffies
;
8001 newinet
->uc_ttl
= inet
->uc_ttl
;
8002 newinet
->mc_loop
= 1;
8003 newinet
->mc_ttl
= 1;
8004 newinet
->mc_index
= 0;
8005 newinet
->mc_list
= NULL
;
8007 if (newsk
->sk_flags
& SK_FLAGS_TIMESTAMP
)
8008 net_enable_timestamp();
8010 security_sk_clone(sk
, newsk
);
8013 static inline void sctp_copy_descendant(struct sock
*sk_to
,
8014 const struct sock
*sk_from
)
8016 int ancestor_size
= sizeof(struct inet_sock
) +
8017 sizeof(struct sctp_sock
) -
8018 offsetof(struct sctp_sock
, auto_asconf_list
);
8020 if (sk_from
->sk_family
== PF_INET6
)
8021 ancestor_size
+= sizeof(struct ipv6_pinfo
);
8023 __inet_sk_copy_descendant(sk_to
, sk_from
, ancestor_size
);
8026 /* Populate the fields of the newsk from the oldsk and migrate the assoc
8027 * and its messages to the newsk.
8029 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
8030 struct sctp_association
*assoc
,
8031 sctp_socket_type_t type
)
8033 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
8034 struct sctp_sock
*newsp
= sctp_sk(newsk
);
8035 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
8036 struct sctp_endpoint
*newep
= newsp
->ep
;
8037 struct sk_buff
*skb
, *tmp
;
8038 struct sctp_ulpevent
*event
;
8039 struct sctp_bind_hashbucket
*head
;
8041 /* Migrate socket buffer sizes and all the socket level options to the
8044 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
8045 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
8046 /* Brute force copy old sctp opt. */
8047 sctp_copy_descendant(newsk
, oldsk
);
8049 /* Restore the ep value that was overwritten with the above structure
8055 /* Hook this new socket in to the bind_hash list. */
8056 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(oldsk
),
8057 inet_sk(oldsk
)->inet_num
)];
8058 spin_lock_bh(&head
->lock
);
8059 pp
= sctp_sk(oldsk
)->bind_hash
;
8060 sk_add_bind_node(newsk
, &pp
->owner
);
8061 sctp_sk(newsk
)->bind_hash
= pp
;
8062 inet_sk(newsk
)->inet_num
= inet_sk(oldsk
)->inet_num
;
8063 spin_unlock_bh(&head
->lock
);
8065 /* Copy the bind_addr list from the original endpoint to the new
8066 * endpoint so that we can handle restarts properly
8068 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
8069 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
8071 /* Move any messages in the old socket's receive queue that are for the
8072 * peeled off association to the new socket's receive queue.
8074 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
8075 event
= sctp_skb2event(skb
);
8076 if (event
->asoc
== assoc
) {
8077 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
8078 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
8079 sctp_skb_set_owner_r_frag(skb
, newsk
);
8083 /* Clean up any messages pending delivery due to partial
8084 * delivery. Three cases:
8085 * 1) No partial deliver; no work.
8086 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
8087 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
8089 skb_queue_head_init(&newsp
->pd_lobby
);
8090 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
8092 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
8093 struct sk_buff_head
*queue
;
8095 /* Decide which queue to move pd_lobby skbs to. */
8096 if (assoc
->ulpq
.pd_mode
) {
8097 queue
= &newsp
->pd_lobby
;
8099 queue
= &newsk
->sk_receive_queue
;
8101 /* Walk through the pd_lobby, looking for skbs that
8102 * need moved to the new socket.
8104 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
8105 event
= sctp_skb2event(skb
);
8106 if (event
->asoc
== assoc
) {
8107 __skb_unlink(skb
, &oldsp
->pd_lobby
);
8108 __skb_queue_tail(queue
, skb
);
8109 sctp_skb_set_owner_r_frag(skb
, newsk
);
8113 /* Clear up any skbs waiting for the partial
8114 * delivery to finish.
8116 if (assoc
->ulpq
.pd_mode
)
8117 sctp_clear_pd(oldsk
, NULL
);
8121 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
)
8122 sctp_skb_set_owner_r_frag(skb
, newsk
);
8124 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
)
8125 sctp_skb_set_owner_r_frag(skb
, newsk
);
8127 /* Set the type of socket to indicate that it is peeled off from the
8128 * original UDP-style socket or created with the accept() call on a
8129 * TCP-style socket..
8133 /* Mark the new socket "in-use" by the user so that any packets
8134 * that may arrive on the association after we've moved it are
8135 * queued to the backlog. This prevents a potential race between
8136 * backlog processing on the old socket and new-packet processing
8137 * on the new socket.
8139 * The caller has just allocated newsk so we can guarantee that other
8140 * paths won't try to lock it and then oldsk.
8142 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
8143 sctp_assoc_migrate(assoc
, newsk
);
8145 /* If the association on the newsk is already closed before accept()
8146 * is called, set RCV_SHUTDOWN flag.
8148 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
)) {
8149 newsk
->sk_state
= SCTP_SS_CLOSED
;
8150 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
8152 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
8155 release_sock(newsk
);
8159 /* This proto struct describes the ULP interface for SCTP. */
8160 struct proto sctp_prot
= {
8162 .owner
= THIS_MODULE
,
8163 .close
= sctp_close
,
8164 .connect
= sctp_connect
,
8165 .disconnect
= sctp_disconnect
,
8166 .accept
= sctp_accept
,
8167 .ioctl
= sctp_ioctl
,
8168 .init
= sctp_init_sock
,
8169 .destroy
= sctp_destroy_sock
,
8170 .shutdown
= sctp_shutdown
,
8171 .setsockopt
= sctp_setsockopt
,
8172 .getsockopt
= sctp_getsockopt
,
8173 .sendmsg
= sctp_sendmsg
,
8174 .recvmsg
= sctp_recvmsg
,
8176 .backlog_rcv
= sctp_backlog_rcv
,
8178 .unhash
= sctp_unhash
,
8179 .get_port
= sctp_get_port
,
8180 .obj_size
= sizeof(struct sctp_sock
),
8181 .sysctl_mem
= sysctl_sctp_mem
,
8182 .sysctl_rmem
= sysctl_sctp_rmem
,
8183 .sysctl_wmem
= sysctl_sctp_wmem
,
8184 .memory_pressure
= &sctp_memory_pressure
,
8185 .enter_memory_pressure
= sctp_enter_memory_pressure
,
8186 .memory_allocated
= &sctp_memory_allocated
,
8187 .sockets_allocated
= &sctp_sockets_allocated
,
8190 #if IS_ENABLED(CONFIG_IPV6)
8192 #include <net/transp_v6.h>
8193 static void sctp_v6_destroy_sock(struct sock
*sk
)
8195 sctp_destroy_sock(sk
);
8196 inet6_destroy_sock(sk
);
8199 struct proto sctpv6_prot
= {
8201 .owner
= THIS_MODULE
,
8202 .close
= sctp_close
,
8203 .connect
= sctp_connect
,
8204 .disconnect
= sctp_disconnect
,
8205 .accept
= sctp_accept
,
8206 .ioctl
= sctp_ioctl
,
8207 .init
= sctp_init_sock
,
8208 .destroy
= sctp_v6_destroy_sock
,
8209 .shutdown
= sctp_shutdown
,
8210 .setsockopt
= sctp_setsockopt
,
8211 .getsockopt
= sctp_getsockopt
,
8212 .sendmsg
= sctp_sendmsg
,
8213 .recvmsg
= sctp_recvmsg
,
8215 .backlog_rcv
= sctp_backlog_rcv
,
8217 .unhash
= sctp_unhash
,
8218 .get_port
= sctp_get_port
,
8219 .obj_size
= sizeof(struct sctp6_sock
),
8220 .sysctl_mem
= sysctl_sctp_mem
,
8221 .sysctl_rmem
= sysctl_sctp_rmem
,
8222 .sysctl_wmem
= sysctl_sctp_wmem
,
8223 .memory_pressure
= &sctp_memory_pressure
,
8224 .enter_memory_pressure
= sctp_enter_memory_pressure
,
8225 .memory_allocated
= &sctp_memory_allocated
,
8226 .sockets_allocated
= &sctp_sockets_allocated
,
8228 #endif /* IS_ENABLED(CONFIG_IPV6) */