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>
82 #include <net/sctp/stream_sched.h>
84 /* Forward declarations for internal helper functions. */
85 static bool sctp_writeable(struct sock
*sk
);
86 static void sctp_wfree(struct sk_buff
*skb
);
87 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
89 static int sctp_wait_for_packet(struct sock
*sk
, int *err
, long *timeo_p
);
90 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
91 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
92 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
93 static void sctp_destruct_sock(struct sock
*sk
);
94 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
95 union sctp_addr
*addr
, int len
);
96 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
97 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
98 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
99 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
100 static int sctp_send_asconf(struct sctp_association
*asoc
,
101 struct sctp_chunk
*chunk
);
102 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
103 static int sctp_autobind(struct sock
*sk
);
104 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
105 struct sctp_association
*assoc
,
106 enum sctp_socket_type type
);
108 static unsigned long sctp_memory_pressure
;
109 static atomic_long_t sctp_memory_allocated
;
110 struct percpu_counter sctp_sockets_allocated
;
112 static void sctp_enter_memory_pressure(struct sock
*sk
)
114 sctp_memory_pressure
= 1;
118 /* Get the sndbuf space available at the time on the association. */
119 static inline int sctp_wspace(struct sctp_association
*asoc
)
121 struct sock
*sk
= asoc
->base
.sk
;
123 return asoc
->ep
->sndbuf_policy
? sk
->sk_sndbuf
- asoc
->sndbuf_used
124 : sk_stream_wspace(sk
);
127 /* Increment the used sndbuf space count of the corresponding association by
128 * the size of the outgoing data chunk.
129 * Also, set the skb destructor for sndbuf accounting later.
131 * Since it is always 1-1 between chunk and skb, and also a new skb is always
132 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
133 * destructor in the data chunk skb for the purpose of the sndbuf space
136 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
138 struct sctp_association
*asoc
= chunk
->asoc
;
139 struct sock
*sk
= asoc
->base
.sk
;
141 /* The sndbuf space is tracked per association. */
142 sctp_association_hold(asoc
);
144 skb_set_owner_w(chunk
->skb
, sk
);
146 chunk
->skb
->destructor
= sctp_wfree
;
147 /* Save the chunk pointer in skb for sctp_wfree to use later. */
148 skb_shinfo(chunk
->skb
)->destructor_arg
= chunk
;
150 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
151 sizeof(struct sk_buff
) +
152 sizeof(struct sctp_chunk
);
154 refcount_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
155 sk
->sk_wmem_queued
+= chunk
->skb
->truesize
;
156 sk_mem_charge(sk
, chunk
->skb
->truesize
);
159 static void sctp_clear_owner_w(struct sctp_chunk
*chunk
)
161 skb_orphan(chunk
->skb
);
164 static void sctp_for_each_tx_datachunk(struct sctp_association
*asoc
,
165 void (*cb
)(struct sctp_chunk
*))
168 struct sctp_outq
*q
= &asoc
->outqueue
;
169 struct sctp_transport
*t
;
170 struct sctp_chunk
*chunk
;
172 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
, transports
)
173 list_for_each_entry(chunk
, &t
->transmitted
, transmitted_list
)
176 list_for_each_entry(chunk
, &q
->retransmit
, transmitted_list
)
179 list_for_each_entry(chunk
, &q
->sacked
, transmitted_list
)
182 list_for_each_entry(chunk
, &q
->abandoned
, transmitted_list
)
185 list_for_each_entry(chunk
, &q
->out_chunk_list
, list
)
189 /* Verify that this is a valid address. */
190 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
195 /* Verify basic sockaddr. */
196 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
200 /* Is this a valid SCTP address? */
201 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
204 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
210 /* Look up the association by its id. If this is not a UDP-style
211 * socket, the ID field is always ignored.
213 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
215 struct sctp_association
*asoc
= NULL
;
217 /* If this is not a UDP-style socket, assoc id should be ignored. */
218 if (!sctp_style(sk
, UDP
)) {
219 /* Return NULL if the socket state is not ESTABLISHED. It
220 * could be a TCP-style listening socket or a socket which
221 * hasn't yet called connect() to establish an association.
223 if (!sctp_sstate(sk
, ESTABLISHED
) && !sctp_sstate(sk
, CLOSING
))
226 /* Get the first and the only association from the list. */
227 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
228 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
229 struct sctp_association
, asocs
);
233 /* Otherwise this is a UDP-style socket. */
234 if (!id
|| (id
== (sctp_assoc_t
)-1))
237 spin_lock_bh(&sctp_assocs_id_lock
);
238 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
239 if (asoc
&& (asoc
->base
.sk
!= sk
|| asoc
->base
.dead
))
241 spin_unlock_bh(&sctp_assocs_id_lock
);
246 /* Look up the transport from an address and an assoc id. If both address and
247 * id are specified, the associations matching the address and the id should be
250 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
251 struct sockaddr_storage
*addr
,
254 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
255 struct sctp_af
*af
= sctp_get_af_specific(addr
->ss_family
);
256 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
257 struct sctp_transport
*transport
;
259 if (!af
|| sctp_verify_addr(sk
, laddr
, af
->sockaddr_len
))
262 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
269 id_asoc
= sctp_id2assoc(sk
, id
);
270 if (id_asoc
&& (id_asoc
!= addr_asoc
))
273 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sctp_sk(sk
),
274 (union sctp_addr
*)addr
);
279 /* API 3.1.2 bind() - UDP Style Syntax
280 * The syntax of bind() is,
282 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
284 * sd - the socket descriptor returned by socket().
285 * addr - the address structure (struct sockaddr_in or struct
286 * sockaddr_in6 [RFC 2553]),
287 * addr_len - the size of the address structure.
289 static int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
295 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__
, sk
,
298 /* Disallow binding twice. */
299 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
300 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
310 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
312 /* Verify this is a valid sockaddr. */
313 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
314 union sctp_addr
*addr
, int len
)
318 /* Check minimum size. */
319 if (len
< sizeof (struct sockaddr
))
322 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
325 if (addr
->sa
.sa_family
== AF_INET6
) {
326 if (len
< SIN6_LEN_RFC2133
)
328 /* V4 mapped address are really of AF_INET family */
329 if (ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
) &&
330 !opt
->pf
->af_supported(AF_INET
, opt
))
334 /* If we get this far, af is valid. */
335 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
337 if (len
< af
->sockaddr_len
)
343 /* Bind a local address either to an endpoint or to an association. */
344 static int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
346 struct net
*net
= sock_net(sk
);
347 struct sctp_sock
*sp
= sctp_sk(sk
);
348 struct sctp_endpoint
*ep
= sp
->ep
;
349 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
354 /* Common sockaddr verification. */
355 af
= sctp_sockaddr_af(sp
, addr
, len
);
357 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
358 __func__
, sk
, addr
, len
);
362 snum
= ntohs(addr
->v4
.sin_port
);
364 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
365 __func__
, sk
, &addr
->sa
, bp
->port
, snum
, len
);
367 /* PF specific bind() address verification. */
368 if (!sp
->pf
->bind_verify(sp
, addr
))
369 return -EADDRNOTAVAIL
;
371 /* We must either be unbound, or bind to the same port.
372 * It's OK to allow 0 ports if we are already bound.
373 * We'll just inhert an already bound port in this case
378 else if (snum
!= bp
->port
) {
379 pr_debug("%s: new port %d doesn't match existing port "
380 "%d\n", __func__
, snum
, bp
->port
);
385 if (snum
&& snum
< inet_prot_sock(net
) &&
386 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
))
389 /* See if the address matches any of the addresses we may have
390 * already bound before checking against other endpoints.
392 if (sctp_bind_addr_match(bp
, addr
, sp
))
395 /* Make sure we are allowed to bind here.
396 * The function sctp_get_port_local() does duplicate address
399 addr
->v4
.sin_port
= htons(snum
);
400 if ((ret
= sctp_get_port_local(sk
, addr
))) {
404 /* Refresh ephemeral port. */
406 bp
->port
= inet_sk(sk
)->inet_num
;
408 /* Add the address to the bind address list.
409 * Use GFP_ATOMIC since BHs will be disabled.
411 ret
= sctp_add_bind_addr(bp
, addr
, af
->sockaddr_len
,
412 SCTP_ADDR_SRC
, GFP_ATOMIC
);
414 /* Copy back into socket for getsockname() use. */
416 inet_sk(sk
)->inet_sport
= htons(inet_sk(sk
)->inet_num
);
417 sp
->pf
->to_sk_saddr(addr
, sk
);
423 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
425 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
426 * at any one time. If a sender, after sending an ASCONF chunk, decides
427 * it needs to transfer another ASCONF Chunk, it MUST wait until the
428 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
429 * subsequent ASCONF. Note this restriction binds each side, so at any
430 * time two ASCONF may be in-transit on any given association (one sent
431 * from each endpoint).
433 static int sctp_send_asconf(struct sctp_association
*asoc
,
434 struct sctp_chunk
*chunk
)
436 struct net
*net
= sock_net(asoc
->base
.sk
);
439 /* If there is an outstanding ASCONF chunk, queue it for later
442 if (asoc
->addip_last_asconf
) {
443 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
447 /* Hold the chunk until an ASCONF_ACK is received. */
448 sctp_chunk_hold(chunk
);
449 retval
= sctp_primitive_ASCONF(net
, asoc
, chunk
);
451 sctp_chunk_free(chunk
);
453 asoc
->addip_last_asconf
= chunk
;
459 /* Add a list of addresses as bind addresses to local endpoint or
462 * Basically run through each address specified in the addrs/addrcnt
463 * array/length pair, determine if it is IPv6 or IPv4 and call
464 * sctp_do_bind() on it.
466 * If any of them fails, then the operation will be reversed and the
467 * ones that were added will be removed.
469 * Only sctp_setsockopt_bindx() is supposed to call this function.
471 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
476 struct sockaddr
*sa_addr
;
479 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__
, sk
,
483 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
484 /* The list may contain either IPv4 or IPv6 address;
485 * determine the address length for walking thru the list.
488 af
= sctp_get_af_specific(sa_addr
->sa_family
);
494 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
497 addr_buf
+= af
->sockaddr_len
;
501 /* Failed. Cleanup the ones that have been added */
503 sctp_bindx_rem(sk
, addrs
, cnt
);
511 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
512 * associations that are part of the endpoint indicating that a list of local
513 * addresses are added to the endpoint.
515 * If any of the addresses is already in the bind address list of the
516 * association, we do not send the chunk for that association. But it will not
517 * affect other associations.
519 * Only sctp_setsockopt_bindx() is supposed to call this function.
521 static int sctp_send_asconf_add_ip(struct sock
*sk
,
522 struct sockaddr
*addrs
,
525 struct net
*net
= sock_net(sk
);
526 struct sctp_sock
*sp
;
527 struct sctp_endpoint
*ep
;
528 struct sctp_association
*asoc
;
529 struct sctp_bind_addr
*bp
;
530 struct sctp_chunk
*chunk
;
531 struct sctp_sockaddr_entry
*laddr
;
532 union sctp_addr
*addr
;
533 union sctp_addr saveaddr
;
540 if (!net
->sctp
.addip_enable
)
546 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
547 __func__
, sk
, addrs
, addrcnt
);
549 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
550 if (!asoc
->peer
.asconf_capable
)
553 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
556 if (!sctp_state(asoc
, ESTABLISHED
))
559 /* Check if any address in the packed array of addresses is
560 * in the bind address list of the association. If so,
561 * do not send the asconf chunk to its peer, but continue with
562 * other associations.
565 for (i
= 0; i
< addrcnt
; i
++) {
567 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
573 if (sctp_assoc_lookup_laddr(asoc
, addr
))
576 addr_buf
+= af
->sockaddr_len
;
581 /* Use the first valid address in bind addr list of
582 * association as Address Parameter of ASCONF CHUNK.
584 bp
= &asoc
->base
.bind_addr
;
585 p
= bp
->address_list
.next
;
586 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
587 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
588 addrcnt
, SCTP_PARAM_ADD_IP
);
594 /* Add the new addresses to the bind address list with
595 * use_as_src set to 0.
598 for (i
= 0; i
< addrcnt
; i
++) {
600 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
601 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
602 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
604 SCTP_ADDR_NEW
, GFP_ATOMIC
);
605 addr_buf
+= af
->sockaddr_len
;
607 if (asoc
->src_out_of_asoc_ok
) {
608 struct sctp_transport
*trans
;
610 list_for_each_entry(trans
,
611 &asoc
->peer
.transport_addr_list
, transports
) {
612 /* Clear the source and route cache */
613 sctp_transport_dst_release(trans
);
614 trans
->cwnd
= min(4*asoc
->pathmtu
, max_t(__u32
,
615 2*asoc
->pathmtu
, 4380));
616 trans
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
617 trans
->rto
= asoc
->rto_initial
;
618 sctp_max_rto(asoc
, trans
);
619 trans
->rtt
= trans
->srtt
= trans
->rttvar
= 0;
620 sctp_transport_route(trans
, NULL
,
621 sctp_sk(asoc
->base
.sk
));
624 retval
= sctp_send_asconf(asoc
, chunk
);
631 /* Remove a list of addresses from bind addresses list. Do not remove the
634 * Basically run through each address specified in the addrs/addrcnt
635 * array/length pair, determine if it is IPv6 or IPv4 and call
636 * sctp_del_bind() on it.
638 * If any of them fails, then the operation will be reversed and the
639 * ones that were removed will be added back.
641 * At least one address has to be left; if only one address is
642 * available, the operation will return -EBUSY.
644 * Only sctp_setsockopt_bindx() is supposed to call this function.
646 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
648 struct sctp_sock
*sp
= sctp_sk(sk
);
649 struct sctp_endpoint
*ep
= sp
->ep
;
651 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
654 union sctp_addr
*sa_addr
;
657 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
658 __func__
, sk
, addrs
, addrcnt
);
661 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
662 /* If the bind address list is empty or if there is only one
663 * bind address, there is nothing more to be removed (we need
664 * at least one address here).
666 if (list_empty(&bp
->address_list
) ||
667 (sctp_list_single_entry(&bp
->address_list
))) {
673 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
679 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
680 retval
= -EADDRNOTAVAIL
;
684 if (sa_addr
->v4
.sin_port
&&
685 sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
690 if (!sa_addr
->v4
.sin_port
)
691 sa_addr
->v4
.sin_port
= htons(bp
->port
);
693 /* FIXME - There is probably a need to check if sk->sk_saddr and
694 * sk->sk_rcv_addr are currently set to one of the addresses to
695 * be removed. This is something which needs to be looked into
696 * when we are fixing the outstanding issues with multi-homing
697 * socket routing and failover schemes. Refer to comments in
698 * sctp_do_bind(). -daisy
700 retval
= sctp_del_bind_addr(bp
, sa_addr
);
702 addr_buf
+= af
->sockaddr_len
;
705 /* Failed. Add the ones that has been removed back */
707 sctp_bindx_add(sk
, addrs
, cnt
);
715 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
716 * the associations that are part of the endpoint indicating that a list of
717 * local addresses are removed from the endpoint.
719 * If any of the addresses is already in the bind address list of the
720 * association, we do not send the chunk for that association. But it will not
721 * affect other associations.
723 * Only sctp_setsockopt_bindx() is supposed to call this function.
725 static int sctp_send_asconf_del_ip(struct sock
*sk
,
726 struct sockaddr
*addrs
,
729 struct net
*net
= sock_net(sk
);
730 struct sctp_sock
*sp
;
731 struct sctp_endpoint
*ep
;
732 struct sctp_association
*asoc
;
733 struct sctp_transport
*transport
;
734 struct sctp_bind_addr
*bp
;
735 struct sctp_chunk
*chunk
;
736 union sctp_addr
*laddr
;
739 struct sctp_sockaddr_entry
*saddr
;
745 if (!net
->sctp
.addip_enable
)
751 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
752 __func__
, sk
, addrs
, addrcnt
);
754 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
756 if (!asoc
->peer
.asconf_capable
)
759 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
762 if (!sctp_state(asoc
, ESTABLISHED
))
765 /* Check if any address in the packed array of addresses is
766 * not present in the bind address list of the association.
767 * If so, do not send the asconf chunk to its peer, but
768 * continue with other associations.
771 for (i
= 0; i
< addrcnt
; i
++) {
773 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
779 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
782 addr_buf
+= af
->sockaddr_len
;
787 /* Find one address in the association's bind address list
788 * that is not in the packed array of addresses. This is to
789 * make sure that we do not delete all the addresses in the
792 bp
= &asoc
->base
.bind_addr
;
793 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
795 if ((laddr
== NULL
) && (addrcnt
== 1)) {
796 if (asoc
->asconf_addr_del_pending
)
798 asoc
->asconf_addr_del_pending
=
799 kzalloc(sizeof(union sctp_addr
), GFP_ATOMIC
);
800 if (asoc
->asconf_addr_del_pending
== NULL
) {
804 asoc
->asconf_addr_del_pending
->sa
.sa_family
=
806 asoc
->asconf_addr_del_pending
->v4
.sin_port
=
808 if (addrs
->sa_family
== AF_INET
) {
809 struct sockaddr_in
*sin
;
811 sin
= (struct sockaddr_in
*)addrs
;
812 asoc
->asconf_addr_del_pending
->v4
.sin_addr
.s_addr
= sin
->sin_addr
.s_addr
;
813 } else if (addrs
->sa_family
== AF_INET6
) {
814 struct sockaddr_in6
*sin6
;
816 sin6
= (struct sockaddr_in6
*)addrs
;
817 asoc
->asconf_addr_del_pending
->v6
.sin6_addr
= sin6
->sin6_addr
;
820 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
821 __func__
, asoc
, &asoc
->asconf_addr_del_pending
->sa
,
822 asoc
->asconf_addr_del_pending
);
824 asoc
->src_out_of_asoc_ok
= 1;
832 /* We do not need RCU protection throughout this loop
833 * because this is done under a socket lock from the
836 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
844 /* Reset use_as_src flag for the addresses in the bind address
845 * list that are to be deleted.
848 for (i
= 0; i
< addrcnt
; i
++) {
850 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
851 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
852 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
853 saddr
->state
= SCTP_ADDR_DEL
;
855 addr_buf
+= af
->sockaddr_len
;
858 /* Update the route and saddr entries for all the transports
859 * as some of the addresses in the bind address list are
860 * about to be deleted and cannot be used as source addresses.
862 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
864 sctp_transport_dst_release(transport
);
865 sctp_transport_route(transport
, NULL
,
866 sctp_sk(asoc
->base
.sk
));
870 /* We don't need to transmit ASCONF */
872 retval
= sctp_send_asconf(asoc
, chunk
);
878 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
879 int sctp_asconf_mgmt(struct sctp_sock
*sp
, struct sctp_sockaddr_entry
*addrw
)
881 struct sock
*sk
= sctp_opt2sk(sp
);
882 union sctp_addr
*addr
;
885 /* It is safe to write port space in caller. */
887 addr
->v4
.sin_port
= htons(sp
->ep
->base
.bind_addr
.port
);
888 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
891 if (sctp_verify_addr(sk
, addr
, af
->sockaddr_len
))
894 if (addrw
->state
== SCTP_ADDR_NEW
)
895 return sctp_send_asconf_add_ip(sk
, (struct sockaddr
*)addr
, 1);
897 return sctp_send_asconf_del_ip(sk
, (struct sockaddr
*)addr
, 1);
900 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
903 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
906 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
907 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
910 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
911 * Section 3.1.2 for this usage.
913 * addrs is a pointer to an array of one or more socket addresses. Each
914 * address is contained in its appropriate structure (i.e. struct
915 * sockaddr_in or struct sockaddr_in6) the family of the address type
916 * must be used to distinguish the address length (note that this
917 * representation is termed a "packed array" of addresses). The caller
918 * specifies the number of addresses in the array with addrcnt.
920 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
921 * -1, and sets errno to the appropriate error code.
923 * For SCTP, the port given in each socket address must be the same, or
924 * sctp_bindx() will fail, setting errno to EINVAL.
926 * The flags parameter is formed from the bitwise OR of zero or more of
927 * the following currently defined flags:
929 * SCTP_BINDX_ADD_ADDR
931 * SCTP_BINDX_REM_ADDR
933 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
934 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
935 * addresses from the association. The two flags are mutually exclusive;
936 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
937 * not remove all addresses from an association; sctp_bindx() will
938 * reject such an attempt with EINVAL.
940 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
941 * additional addresses with an endpoint after calling bind(). Or use
942 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
943 * socket is associated with so that no new association accepted will be
944 * associated with those addresses. If the endpoint supports dynamic
945 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
946 * endpoint to send the appropriate message to the peer to change the
947 * peers address lists.
949 * Adding and removing addresses from a connected association is
950 * optional functionality. Implementations that do not support this
951 * functionality should return EOPNOTSUPP.
953 * Basically do nothing but copying the addresses from user to kernel
954 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
955 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
958 * We don't use copy_from_user() for optimization: we first do the
959 * sanity checks (buffer size -fast- and access check-healthy
960 * pointer); if all of those succeed, then we can alloc the memory
961 * (expensive operation) needed to copy the data to kernel. Then we do
962 * the copying without checking the user space area
963 * (__copy_from_user()).
965 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
968 * sk The sk of the socket
969 * addrs The pointer to the addresses in user land
970 * addrssize Size of the addrs buffer
971 * op Operation to perform (add or remove, see the flags of
974 * Returns 0 if ok, <0 errno code on error.
976 static int sctp_setsockopt_bindx(struct sock
*sk
,
977 struct sockaddr __user
*addrs
,
978 int addrs_size
, int op
)
980 struct sockaddr
*kaddrs
;
984 struct sockaddr
*sa_addr
;
988 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
989 __func__
, sk
, addrs
, addrs_size
, op
);
991 if (unlikely(addrs_size
<= 0))
994 /* Check the user passed a healthy pointer. */
995 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
998 /* Alloc space for the address array in kernel memory. */
999 kaddrs
= kmalloc(addrs_size
, GFP_USER
| __GFP_NOWARN
);
1000 if (unlikely(!kaddrs
))
1003 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1008 /* Walk through the addrs buffer and count the number of addresses. */
1010 while (walk_size
< addrs_size
) {
1011 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1017 af
= sctp_get_af_specific(sa_addr
->sa_family
);
1019 /* If the address family is not supported or if this address
1020 * causes the address buffer to overflow return EINVAL.
1022 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1027 addr_buf
+= af
->sockaddr_len
;
1028 walk_size
+= af
->sockaddr_len
;
1033 case SCTP_BINDX_ADD_ADDR
:
1034 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
1037 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
1040 case SCTP_BINDX_REM_ADDR
:
1041 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
1044 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
1058 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1060 * Common routine for handling connect() and sctp_connectx().
1061 * Connect will come in with just a single address.
1063 static int __sctp_connect(struct sock
*sk
,
1064 struct sockaddr
*kaddrs
,
1065 int addrs_size
, int flags
,
1066 sctp_assoc_t
*assoc_id
)
1068 struct net
*net
= sock_net(sk
);
1069 struct sctp_sock
*sp
;
1070 struct sctp_endpoint
*ep
;
1071 struct sctp_association
*asoc
= NULL
;
1072 struct sctp_association
*asoc2
;
1073 struct sctp_transport
*transport
;
1075 enum sctp_scope scope
;
1080 union sctp_addr
*sa_addr
= NULL
;
1082 unsigned short port
;
1087 /* connect() cannot be done on a socket that is already in ESTABLISHED
1088 * state - UDP-style peeled off socket or a TCP-style socket that
1089 * is already connected.
1090 * It cannot be done even on a TCP-style listening socket.
1092 if (sctp_sstate(sk
, ESTABLISHED
) || sctp_sstate(sk
, CLOSING
) ||
1093 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
1098 /* Walk through the addrs buffer and count the number of addresses. */
1100 while (walk_size
< addrs_size
) {
1103 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1109 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1111 /* If the address family is not supported or if this address
1112 * causes the address buffer to overflow return EINVAL.
1114 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1119 port
= ntohs(sa_addr
->v4
.sin_port
);
1121 /* Save current address so we can work with it */
1122 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1124 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1128 /* Make sure the destination port is correctly set
1131 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
) {
1136 /* Check if there already is a matching association on the
1137 * endpoint (other than the one created here).
1139 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1140 if (asoc2
&& asoc2
!= asoc
) {
1141 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1148 /* If we could not find a matching association on the endpoint,
1149 * make sure that there is no peeled-off association matching
1150 * the peer address even on another socket.
1152 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1153 err
= -EADDRNOTAVAIL
;
1158 /* If a bind() or sctp_bindx() is not called prior to
1159 * an sctp_connectx() call, the system picks an
1160 * ephemeral port and will choose an address set
1161 * equivalent to binding with a wildcard address.
1163 if (!ep
->base
.bind_addr
.port
) {
1164 if (sctp_autobind(sk
)) {
1170 * If an unprivileged user inherits a 1-many
1171 * style socket with open associations on a
1172 * privileged port, it MAY be permitted to
1173 * accept new associations, but it SHOULD NOT
1174 * be permitted to open new associations.
1176 if (ep
->base
.bind_addr
.port
<
1177 inet_prot_sock(net
) &&
1178 !ns_capable(net
->user_ns
,
1179 CAP_NET_BIND_SERVICE
)) {
1185 scope
= sctp_scope(&to
);
1186 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1192 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
,
1200 /* Prime the peer's transport structures. */
1201 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1209 addr_buf
+= af
->sockaddr_len
;
1210 walk_size
+= af
->sockaddr_len
;
1213 /* In case the user of sctp_connectx() wants an association
1214 * id back, assign one now.
1217 err
= sctp_assoc_set_id(asoc
, GFP_KERNEL
);
1222 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1227 /* Initialize sk's dport and daddr for getpeername() */
1228 inet_sk(sk
)->inet_dport
= htons(asoc
->peer
.port
);
1229 sp
->pf
->to_sk_daddr(sa_addr
, sk
);
1232 timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
1235 *assoc_id
= asoc
->assoc_id
;
1236 err
= sctp_wait_for_connect(asoc
, &timeo
);
1237 /* Note: the asoc may be freed after the return of
1238 * sctp_wait_for_connect.
1241 /* Don't free association on exit. */
1245 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1246 __func__
, asoc
, kaddrs
, err
);
1249 /* sctp_primitive_ASSOCIATE may have added this association
1250 * To the hash table, try to unhash it, just in case, its a noop
1251 * if it wasn't hashed so we're safe
1253 sctp_association_free(asoc
);
1258 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1261 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1262 * sctp_assoc_t *asoc);
1264 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1265 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1266 * or IPv6 addresses.
1268 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1269 * Section 3.1.2 for this usage.
1271 * addrs is a pointer to an array of one or more socket addresses. Each
1272 * address is contained in its appropriate structure (i.e. struct
1273 * sockaddr_in or struct sockaddr_in6) the family of the address type
1274 * must be used to distengish the address length (note that this
1275 * representation is termed a "packed array" of addresses). The caller
1276 * specifies the number of addresses in the array with addrcnt.
1278 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1279 * the association id of the new association. On failure, sctp_connectx()
1280 * returns -1, and sets errno to the appropriate error code. The assoc_id
1281 * is not touched by the kernel.
1283 * For SCTP, the port given in each socket address must be the same, or
1284 * sctp_connectx() will fail, setting errno to EINVAL.
1286 * An application can use sctp_connectx to initiate an association with
1287 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1288 * allows a caller to specify multiple addresses at which a peer can be
1289 * reached. The way the SCTP stack uses the list of addresses to set up
1290 * the association is implementation dependent. This function only
1291 * specifies that the stack will try to make use of all the addresses in
1292 * the list when needed.
1294 * Note that the list of addresses passed in is only used for setting up
1295 * the association. It does not necessarily equal the set of addresses
1296 * the peer uses for the resulting association. If the caller wants to
1297 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1298 * retrieve them after the association has been set up.
1300 * Basically do nothing but copying the addresses from user to kernel
1301 * land and invoking either sctp_connectx(). This is used for tunneling
1302 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1304 * We don't use copy_from_user() for optimization: we first do the
1305 * sanity checks (buffer size -fast- and access check-healthy
1306 * pointer); if all of those succeed, then we can alloc the memory
1307 * (expensive operation) needed to copy the data to kernel. Then we do
1308 * the copying without checking the user space area
1309 * (__copy_from_user()).
1311 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1314 * sk The sk of the socket
1315 * addrs The pointer to the addresses in user land
1316 * addrssize Size of the addrs buffer
1318 * Returns >=0 if ok, <0 errno code on error.
1320 static int __sctp_setsockopt_connectx(struct sock
*sk
,
1321 struct sockaddr __user
*addrs
,
1323 sctp_assoc_t
*assoc_id
)
1325 struct sockaddr
*kaddrs
;
1326 gfp_t gfp
= GFP_KERNEL
;
1327 int err
= 0, flags
= 0;
1329 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1330 __func__
, sk
, addrs
, addrs_size
);
1332 if (unlikely(addrs_size
<= 0))
1335 /* Check the user passed a healthy pointer. */
1336 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1339 /* Alloc space for the address array in kernel memory. */
1340 if (sk
->sk_socket
->file
)
1341 gfp
= GFP_USER
| __GFP_NOWARN
;
1342 kaddrs
= kmalloc(addrs_size
, gfp
);
1343 if (unlikely(!kaddrs
))
1346 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1351 /* in-kernel sockets don't generally have a file allocated to them
1352 * if all they do is call sock_create_kern().
1354 if (sk
->sk_socket
->file
)
1355 flags
= sk
->sk_socket
->file
->f_flags
;
1357 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, flags
, assoc_id
);
1365 * This is an older interface. It's kept for backward compatibility
1366 * to the option that doesn't provide association id.
1368 static int sctp_setsockopt_connectx_old(struct sock
*sk
,
1369 struct sockaddr __user
*addrs
,
1372 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1376 * New interface for the API. The since the API is done with a socket
1377 * option, to make it simple we feed back the association id is as a return
1378 * indication to the call. Error is always negative and association id is
1381 static int sctp_setsockopt_connectx(struct sock
*sk
,
1382 struct sockaddr __user
*addrs
,
1385 sctp_assoc_t assoc_id
= 0;
1388 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1397 * New (hopefully final) interface for the API.
1398 * We use the sctp_getaddrs_old structure so that use-space library
1399 * can avoid any unnecessary allocations. The only different part
1400 * is that we store the actual length of the address buffer into the
1401 * addrs_num structure member. That way we can re-use the existing
1404 #ifdef CONFIG_COMPAT
1405 struct compat_sctp_getaddrs_old
{
1406 sctp_assoc_t assoc_id
;
1408 compat_uptr_t addrs
; /* struct sockaddr * */
1412 static int sctp_getsockopt_connectx3(struct sock
*sk
, int len
,
1413 char __user
*optval
,
1416 struct sctp_getaddrs_old param
;
1417 sctp_assoc_t assoc_id
= 0;
1420 #ifdef CONFIG_COMPAT
1421 if (in_compat_syscall()) {
1422 struct compat_sctp_getaddrs_old param32
;
1424 if (len
< sizeof(param32
))
1426 if (copy_from_user(¶m32
, optval
, sizeof(param32
)))
1429 param
.assoc_id
= param32
.assoc_id
;
1430 param
.addr_num
= param32
.addr_num
;
1431 param
.addrs
= compat_ptr(param32
.addrs
);
1435 if (len
< sizeof(param
))
1437 if (copy_from_user(¶m
, optval
, sizeof(param
)))
1441 err
= __sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)
1442 param
.addrs
, param
.addr_num
,
1444 if (err
== 0 || err
== -EINPROGRESS
) {
1445 if (copy_to_user(optval
, &assoc_id
, sizeof(assoc_id
)))
1447 if (put_user(sizeof(assoc_id
), optlen
))
1454 /* API 3.1.4 close() - UDP Style Syntax
1455 * Applications use close() to perform graceful shutdown (as described in
1456 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1457 * by a UDP-style socket.
1461 * ret = close(int sd);
1463 * sd - the socket descriptor of the associations to be closed.
1465 * To gracefully shutdown a specific association represented by the
1466 * UDP-style socket, an application should use the sendmsg() call,
1467 * passing no user data, but including the appropriate flag in the
1468 * ancillary data (see Section xxxx).
1470 * If sd in the close() call is a branched-off socket representing only
1471 * one association, the shutdown is performed on that association only.
1473 * 4.1.6 close() - TCP Style Syntax
1475 * Applications use close() to gracefully close down an association.
1479 * int close(int sd);
1481 * sd - the socket descriptor of the association to be closed.
1483 * After an application calls close() on a socket descriptor, no further
1484 * socket operations will succeed on that descriptor.
1486 * API 7.1.4 SO_LINGER
1488 * An application using the TCP-style socket can use this option to
1489 * perform the SCTP ABORT primitive. The linger option structure is:
1492 * int l_onoff; // option on/off
1493 * int l_linger; // linger time
1496 * To enable the option, set l_onoff to 1. If the l_linger value is set
1497 * to 0, calling close() is the same as the ABORT primitive. If the
1498 * value is set to a negative value, the setsockopt() call will return
1499 * an error. If the value is set to a positive value linger_time, the
1500 * close() can be blocked for at most linger_time ms. If the graceful
1501 * shutdown phase does not finish during this period, close() will
1502 * return but the graceful shutdown phase continues in the system.
1504 static void sctp_close(struct sock
*sk
, long timeout
)
1506 struct net
*net
= sock_net(sk
);
1507 struct sctp_endpoint
*ep
;
1508 struct sctp_association
*asoc
;
1509 struct list_head
*pos
, *temp
;
1510 unsigned int data_was_unread
;
1512 pr_debug("%s: sk:%p, timeout:%ld\n", __func__
, sk
, timeout
);
1514 lock_sock_nested(sk
, SINGLE_DEPTH_NESTING
);
1515 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1516 sk
->sk_state
= SCTP_SS_CLOSING
;
1518 ep
= sctp_sk(sk
)->ep
;
1520 /* Clean up any skbs sitting on the receive queue. */
1521 data_was_unread
= sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1522 data_was_unread
+= sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1524 /* Walk all associations on an endpoint. */
1525 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1526 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1528 if (sctp_style(sk
, TCP
)) {
1529 /* A closed association can still be in the list if
1530 * it belongs to a TCP-style listening socket that is
1531 * not yet accepted. If so, free it. If not, send an
1532 * ABORT or SHUTDOWN based on the linger options.
1534 if (sctp_state(asoc
, CLOSED
)) {
1535 sctp_association_free(asoc
);
1540 if (data_was_unread
|| !skb_queue_empty(&asoc
->ulpq
.lobby
) ||
1541 !skb_queue_empty(&asoc
->ulpq
.reasm
) ||
1542 (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
)) {
1543 struct sctp_chunk
*chunk
;
1545 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1546 sctp_primitive_ABORT(net
, asoc
, chunk
);
1548 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1551 /* On a TCP-style socket, block for at most linger_time if set. */
1552 if (sctp_style(sk
, TCP
) && timeout
)
1553 sctp_wait_for_close(sk
, timeout
);
1555 /* This will run the backlog queue. */
1558 /* Supposedly, no process has access to the socket, but
1559 * the net layers still may.
1560 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1561 * held and that should be grabbed before socket lock.
1563 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
1564 bh_lock_sock_nested(sk
);
1566 /* Hold the sock, since sk_common_release() will put sock_put()
1567 * and we have just a little more cleanup.
1570 sk_common_release(sk
);
1573 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
1577 SCTP_DBG_OBJCNT_DEC(sock
);
1580 /* Handle EPIPE error. */
1581 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1584 err
= sock_error(sk
) ? : -EPIPE
;
1585 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1586 send_sig(SIGPIPE
, current
, 0);
1590 /* API 3.1.3 sendmsg() - UDP Style Syntax
1592 * An application uses sendmsg() and recvmsg() calls to transmit data to
1593 * and receive data from its peer.
1595 * ssize_t sendmsg(int socket, const struct msghdr *message,
1598 * socket - the socket descriptor of the endpoint.
1599 * message - pointer to the msghdr structure which contains a single
1600 * user message and possibly some ancillary data.
1602 * See Section 5 for complete description of the data
1605 * flags - flags sent or received with the user message, see Section
1606 * 5 for complete description of the flags.
1608 * Note: This function could use a rewrite especially when explicit
1609 * connect support comes in.
1611 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1613 static int sctp_msghdr_parse(const struct msghdr
*msg
,
1614 struct sctp_cmsgs
*cmsgs
);
1616 static int sctp_sendmsg(struct sock
*sk
, struct msghdr
*msg
, size_t msg_len
)
1618 struct net
*net
= sock_net(sk
);
1619 struct sctp_sock
*sp
;
1620 struct sctp_endpoint
*ep
;
1621 struct sctp_association
*new_asoc
= NULL
, *asoc
= NULL
;
1622 struct sctp_transport
*transport
, *chunk_tp
;
1623 struct sctp_chunk
*chunk
;
1625 struct sockaddr
*msg_name
= NULL
;
1626 struct sctp_sndrcvinfo default_sinfo
;
1627 struct sctp_sndrcvinfo
*sinfo
;
1628 struct sctp_initmsg
*sinit
;
1629 sctp_assoc_t associd
= 0;
1630 struct sctp_cmsgs cmsgs
= { NULL
};
1631 enum sctp_scope scope
;
1632 bool fill_sinfo_ttl
= false, wait_connect
= false;
1633 struct sctp_datamsg
*datamsg
;
1634 int msg_flags
= msg
->msg_flags
;
1635 __u16 sinfo_flags
= 0;
1643 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__
, sk
,
1646 /* We cannot send a message over a TCP-style listening socket. */
1647 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1652 /* Parse out the SCTP CMSGs. */
1653 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1655 pr_debug("%s: msghdr parse err:%x\n", __func__
, err
);
1659 /* Fetch the destination address for this packet. This
1660 * address only selects the association--it is not necessarily
1661 * the address we will send to.
1662 * For a peeled-off socket, msg_name is ignored.
1664 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1665 int msg_namelen
= msg
->msg_namelen
;
1667 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1672 if (msg_namelen
> sizeof(to
))
1673 msg_namelen
= sizeof(to
);
1674 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1675 msg_name
= msg
->msg_name
;
1679 if (cmsgs
.sinfo
!= NULL
) {
1680 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1681 default_sinfo
.sinfo_stream
= cmsgs
.sinfo
->snd_sid
;
1682 default_sinfo
.sinfo_flags
= cmsgs
.sinfo
->snd_flags
;
1683 default_sinfo
.sinfo_ppid
= cmsgs
.sinfo
->snd_ppid
;
1684 default_sinfo
.sinfo_context
= cmsgs
.sinfo
->snd_context
;
1685 default_sinfo
.sinfo_assoc_id
= cmsgs
.sinfo
->snd_assoc_id
;
1687 sinfo
= &default_sinfo
;
1688 fill_sinfo_ttl
= true;
1690 sinfo
= cmsgs
.srinfo
;
1692 /* Did the user specify SNDINFO/SNDRCVINFO? */
1694 sinfo_flags
= sinfo
->sinfo_flags
;
1695 associd
= sinfo
->sinfo_assoc_id
;
1698 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__
,
1699 msg_len
, sinfo_flags
);
1701 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1702 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1707 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1708 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1709 * If SCTP_ABORT is set, the message length could be non zero with
1710 * the msg_iov set to the user abort reason.
1712 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1713 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1718 /* If SCTP_ADDR_OVER is set, there must be an address
1719 * specified in msg_name.
1721 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1728 pr_debug("%s: about to look up association\n", __func__
);
1732 /* If a msg_name has been specified, assume this is to be used. */
1734 /* Look for a matching association on the endpoint. */
1735 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1737 /* If we could not find a matching association on the
1738 * endpoint, make sure that it is not a TCP-style
1739 * socket that already has an association or there is
1740 * no peeled-off association on another socket.
1743 ((sctp_style(sk
, TCP
) &&
1744 (sctp_sstate(sk
, ESTABLISHED
) ||
1745 sctp_sstate(sk
, CLOSING
))) ||
1746 sctp_endpoint_is_peeled_off(ep
, &to
))) {
1747 err
= -EADDRNOTAVAIL
;
1751 asoc
= sctp_id2assoc(sk
, associd
);
1759 pr_debug("%s: just looked up association:%p\n", __func__
, asoc
);
1761 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1762 * socket that has an association in CLOSED state. This can
1763 * happen when an accepted socket has an association that is
1766 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1771 if (sinfo_flags
& SCTP_EOF
) {
1772 pr_debug("%s: shutting down association:%p\n",
1775 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1779 if (sinfo_flags
& SCTP_ABORT
) {
1781 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1787 pr_debug("%s: aborting association:%p\n",
1790 sctp_primitive_ABORT(net
, asoc
, chunk
);
1796 /* Do we need to create the association? */
1798 pr_debug("%s: there is no association yet\n", __func__
);
1800 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1805 /* Check for invalid stream against the stream counts,
1806 * either the default or the user specified stream counts.
1809 if (!sinit
|| !sinit
->sinit_num_ostreams
) {
1810 /* Check against the defaults. */
1811 if (sinfo
->sinfo_stream
>=
1812 sp
->initmsg
.sinit_num_ostreams
) {
1817 /* Check against the requested. */
1818 if (sinfo
->sinfo_stream
>=
1819 sinit
->sinit_num_ostreams
) {
1827 * API 3.1.2 bind() - UDP Style Syntax
1828 * If a bind() or sctp_bindx() is not called prior to a
1829 * sendmsg() call that initiates a new association, the
1830 * system picks an ephemeral port and will choose an address
1831 * set equivalent to binding with a wildcard address.
1833 if (!ep
->base
.bind_addr
.port
) {
1834 if (sctp_autobind(sk
)) {
1840 * If an unprivileged user inherits a one-to-many
1841 * style socket with open associations on a privileged
1842 * port, it MAY be permitted to accept new associations,
1843 * but it SHOULD NOT be permitted to open new
1846 if (ep
->base
.bind_addr
.port
< inet_prot_sock(net
) &&
1847 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
)) {
1853 scope
= sctp_scope(&to
);
1854 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1860 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
, GFP_KERNEL
);
1866 /* If the SCTP_INIT ancillary data is specified, set all
1867 * the association init values accordingly.
1870 if (sinit
->sinit_num_ostreams
) {
1871 __u16 outcnt
= sinit
->sinit_num_ostreams
;
1873 asoc
->c
.sinit_num_ostreams
= outcnt
;
1874 /* outcnt has been changed, so re-init stream */
1875 err
= sctp_stream_init(&asoc
->stream
, outcnt
, 0,
1880 if (sinit
->sinit_max_instreams
) {
1881 asoc
->c
.sinit_max_instreams
=
1882 sinit
->sinit_max_instreams
;
1884 if (sinit
->sinit_max_attempts
) {
1885 asoc
->max_init_attempts
1886 = sinit
->sinit_max_attempts
;
1888 if (sinit
->sinit_max_init_timeo
) {
1889 asoc
->max_init_timeo
=
1890 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1894 /* Prime the peer's transport structures. */
1895 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1902 /* ASSERT: we have a valid association at this point. */
1903 pr_debug("%s: we have a valid association\n", __func__
);
1906 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1907 * one with some defaults.
1909 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1910 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1911 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1912 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1913 default_sinfo
.sinfo_context
= asoc
->default_context
;
1914 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1915 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1917 sinfo
= &default_sinfo
;
1918 } else if (fill_sinfo_ttl
) {
1919 /* In case SNDINFO was specified, we still need to fill
1920 * it with a default ttl from the assoc here.
1922 sinfo
->sinfo_timetolive
= asoc
->default_timetolive
;
1925 /* API 7.1.7, the sndbuf size per association bounds the
1926 * maximum size of data that can be sent in a single send call.
1928 if (msg_len
> sk
->sk_sndbuf
) {
1933 if (asoc
->pmtu_pending
)
1934 sctp_assoc_pending_pmtu(asoc
);
1936 /* If fragmentation is disabled and the message length exceeds the
1937 * association fragmentation point, return EMSGSIZE. The I-D
1938 * does not specify what this error is, but this looks like
1941 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1946 /* Check for invalid stream. */
1947 if (sinfo
->sinfo_stream
>= asoc
->stream
.outcnt
) {
1952 /* Allocate sctp_stream_out_ext if not already done */
1953 if (unlikely(!asoc
->stream
.out
[sinfo
->sinfo_stream
].ext
)) {
1954 err
= sctp_stream_init_ext(&asoc
->stream
, sinfo
->sinfo_stream
);
1959 if (sctp_wspace(asoc
) < (int)msg_len
)
1960 sctp_prsctp_prune(asoc
, sinfo
, msg_len
- sctp_wspace(asoc
));
1962 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1963 if (sk_under_memory_pressure(sk
))
1966 if (sctp_wspace(asoc
) <= 0 || !sk_wmem_schedule(sk
, msg_len
)) {
1967 /* sk can be changed by peel off when waiting for buf. */
1968 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1970 if (err
== -ESRCH
) {
1971 /* asoc is already dead. */
1979 /* If an address is passed with the sendto/sendmsg call, it is used
1980 * to override the primary destination address in the TCP model, or
1981 * when SCTP_ADDR_OVER flag is set in the UDP model.
1983 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1984 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1985 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1993 /* Auto-connect, if we aren't connected already. */
1994 if (sctp_state(asoc
, CLOSED
)) {
1995 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1999 wait_connect
= true;
2000 pr_debug("%s: we associated primitively\n", __func__
);
2003 /* Break the message into multiple chunks of maximum size. */
2004 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, &msg
->msg_iter
);
2005 if (IS_ERR(datamsg
)) {
2006 err
= PTR_ERR(datamsg
);
2009 asoc
->force_delay
= !!(msg
->msg_flags
& MSG_MORE
);
2011 /* Now send the (possibly) fragmented message. */
2012 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
2013 sctp_chunk_hold(chunk
);
2015 /* Do accounting for the write space. */
2016 sctp_set_owner_w(chunk
);
2018 chunk
->transport
= chunk_tp
;
2021 /* Send it to the lower layers. Note: all chunks
2022 * must either fail or succeed. The lower layer
2023 * works that way today. Keep it that way or this
2026 err
= sctp_primitive_SEND(net
, asoc
, datamsg
);
2027 /* Did the lower layer accept the chunk? */
2029 sctp_datamsg_free(datamsg
);
2033 pr_debug("%s: we sent primitively\n", __func__
);
2035 sctp_datamsg_put(datamsg
);
2038 if (unlikely(wait_connect
)) {
2039 timeo
= sock_sndtimeo(sk
, msg_flags
& MSG_DONTWAIT
);
2040 sctp_wait_for_connect(asoc
, &timeo
);
2043 /* If we are already past ASSOCIATE, the lower
2044 * layers are responsible for association cleanup.
2050 sctp_association_free(asoc
);
2055 return sctp_error(sk
, msg_flags
, err
);
2062 err
= sock_error(sk
);
2072 /* This is an extended version of skb_pull() that removes the data from the
2073 * start of a skb even when data is spread across the list of skb's in the
2074 * frag_list. len specifies the total amount of data that needs to be removed.
2075 * when 'len' bytes could be removed from the skb, it returns 0.
2076 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2077 * could not be removed.
2079 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
2081 struct sk_buff
*list
;
2082 int skb_len
= skb_headlen(skb
);
2085 if (len
<= skb_len
) {
2086 __skb_pull(skb
, len
);
2090 __skb_pull(skb
, skb_len
);
2092 skb_walk_frags(skb
, list
) {
2093 rlen
= sctp_skb_pull(list
, len
);
2094 skb
->len
-= (len
-rlen
);
2095 skb
->data_len
-= (len
-rlen
);
2106 /* API 3.1.3 recvmsg() - UDP Style Syntax
2108 * ssize_t recvmsg(int socket, struct msghdr *message,
2111 * socket - the socket descriptor of the endpoint.
2112 * message - pointer to the msghdr structure which contains a single
2113 * user message and possibly some ancillary data.
2115 * See Section 5 for complete description of the data
2118 * flags - flags sent or received with the user message, see Section
2119 * 5 for complete description of the flags.
2121 static int sctp_recvmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
,
2122 int noblock
, int flags
, int *addr_len
)
2124 struct sctp_ulpevent
*event
= NULL
;
2125 struct sctp_sock
*sp
= sctp_sk(sk
);
2126 struct sk_buff
*skb
, *head_skb
;
2131 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2132 "addr_len:%p)\n", __func__
, sk
, msg
, len
, noblock
, flags
,
2137 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
) &&
2138 !sctp_sstate(sk
, CLOSING
) && !sctp_sstate(sk
, CLOSED
)) {
2143 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
2147 /* Get the total length of the skb including any skb's in the
2156 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
2158 event
= sctp_skb2event(skb
);
2163 if (event
->chunk
&& event
->chunk
->head_skb
)
2164 head_skb
= event
->chunk
->head_skb
;
2167 sock_recv_ts_and_drops(msg
, sk
, head_skb
);
2168 if (sctp_ulpevent_is_notification(event
)) {
2169 msg
->msg_flags
|= MSG_NOTIFICATION
;
2170 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
2172 sp
->pf
->skb_msgname(head_skb
, msg
->msg_name
, addr_len
);
2175 /* Check if we allow SCTP_NXTINFO. */
2176 if (sp
->recvnxtinfo
)
2177 sctp_ulpevent_read_nxtinfo(event
, msg
, sk
);
2178 /* Check if we allow SCTP_RCVINFO. */
2179 if (sp
->recvrcvinfo
)
2180 sctp_ulpevent_read_rcvinfo(event
, msg
);
2181 /* Check if we allow SCTP_SNDRCVINFO. */
2182 if (sp
->subscribe
.sctp_data_io_event
)
2183 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
2187 /* If skb's length exceeds the user's buffer, update the skb and
2188 * push it back to the receive_queue so that the next call to
2189 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2191 if (skb_len
> copied
) {
2192 msg
->msg_flags
&= ~MSG_EOR
;
2193 if (flags
& MSG_PEEK
)
2195 sctp_skb_pull(skb
, copied
);
2196 skb_queue_head(&sk
->sk_receive_queue
, skb
);
2198 /* When only partial message is copied to the user, increase
2199 * rwnd by that amount. If all the data in the skb is read,
2200 * rwnd is updated when the event is freed.
2202 if (!sctp_ulpevent_is_notification(event
))
2203 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
2205 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
2206 (event
->msg_flags
& MSG_EOR
))
2207 msg
->msg_flags
|= MSG_EOR
;
2209 msg
->msg_flags
&= ~MSG_EOR
;
2212 if (flags
& MSG_PEEK
) {
2213 /* Release the skb reference acquired after peeking the skb in
2214 * sctp_skb_recv_datagram().
2218 /* Free the event which includes releasing the reference to
2219 * the owner of the skb, freeing the skb and updating the
2222 sctp_ulpevent_free(event
);
2229 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2231 * This option is a on/off flag. If enabled no SCTP message
2232 * fragmentation will be performed. Instead if a message being sent
2233 * exceeds the current PMTU size, the message will NOT be sent and
2234 * instead a error will be indicated to the user.
2236 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
2237 char __user
*optval
,
2238 unsigned int optlen
)
2242 if (optlen
< sizeof(int))
2245 if (get_user(val
, (int __user
*)optval
))
2248 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
2253 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2254 unsigned int optlen
)
2256 struct sctp_association
*asoc
;
2257 struct sctp_ulpevent
*event
;
2259 if (optlen
> sizeof(struct sctp_event_subscribe
))
2261 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2264 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2265 * if there is no data to be sent or retransmit, the stack will
2266 * immediately send up this notification.
2268 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT
,
2269 &sctp_sk(sk
)->subscribe
)) {
2270 asoc
= sctp_id2assoc(sk
, 0);
2272 if (asoc
&& sctp_outq_is_empty(&asoc
->outqueue
)) {
2273 event
= sctp_ulpevent_make_sender_dry_event(asoc
,
2274 GFP_USER
| __GFP_NOWARN
);
2278 sctp_ulpq_tail_event(&asoc
->ulpq
, event
);
2285 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2287 * This socket option is applicable to the UDP-style socket only. When
2288 * set it will cause associations that are idle for more than the
2289 * specified number of seconds to automatically close. An association
2290 * being idle is defined an association that has NOT sent or received
2291 * user data. The special value of '0' indicates that no automatic
2292 * close of any associations should be performed. The option expects an
2293 * integer defining the number of seconds of idle time before an
2294 * association is closed.
2296 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2297 unsigned int optlen
)
2299 struct sctp_sock
*sp
= sctp_sk(sk
);
2300 struct net
*net
= sock_net(sk
);
2302 /* Applicable to UDP-style socket only */
2303 if (sctp_style(sk
, TCP
))
2305 if (optlen
!= sizeof(int))
2307 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2310 if (sp
->autoclose
> net
->sctp
.max_autoclose
)
2311 sp
->autoclose
= net
->sctp
.max_autoclose
;
2316 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2318 * Applications can enable or disable heartbeats for any peer address of
2319 * an association, modify an address's heartbeat interval, force a
2320 * heartbeat to be sent immediately, and adjust the address's maximum
2321 * number of retransmissions sent before an address is considered
2322 * unreachable. The following structure is used to access and modify an
2323 * address's parameters:
2325 * struct sctp_paddrparams {
2326 * sctp_assoc_t spp_assoc_id;
2327 * struct sockaddr_storage spp_address;
2328 * uint32_t spp_hbinterval;
2329 * uint16_t spp_pathmaxrxt;
2330 * uint32_t spp_pathmtu;
2331 * uint32_t spp_sackdelay;
2332 * uint32_t spp_flags;
2335 * spp_assoc_id - (one-to-many style socket) This is filled in the
2336 * application, and identifies the association for
2338 * spp_address - This specifies which address is of interest.
2339 * spp_hbinterval - This contains the value of the heartbeat interval,
2340 * in milliseconds. If a value of zero
2341 * is present in this field then no changes are to
2342 * be made to this parameter.
2343 * spp_pathmaxrxt - This contains the maximum number of
2344 * retransmissions before this address shall be
2345 * considered unreachable. If a value of zero
2346 * is present in this field then no changes are to
2347 * be made to this parameter.
2348 * spp_pathmtu - When Path MTU discovery is disabled the value
2349 * specified here will be the "fixed" path mtu.
2350 * Note that if the spp_address field is empty
2351 * then all associations on this address will
2352 * have this fixed path mtu set upon them.
2354 * spp_sackdelay - When delayed sack is enabled, this value specifies
2355 * the number of milliseconds that sacks will be delayed
2356 * for. This value will apply to all addresses of an
2357 * association if the spp_address field is empty. Note
2358 * also, that if delayed sack is enabled and this
2359 * value is set to 0, no change is made to the last
2360 * recorded delayed sack timer value.
2362 * spp_flags - These flags are used to control various features
2363 * on an association. The flag field may contain
2364 * zero or more of the following options.
2366 * SPP_HB_ENABLE - Enable heartbeats on the
2367 * specified address. Note that if the address
2368 * field is empty all addresses for the association
2369 * have heartbeats enabled upon them.
2371 * SPP_HB_DISABLE - Disable heartbeats on the
2372 * speicifed address. Note that if the address
2373 * field is empty all addresses for the association
2374 * will have their heartbeats disabled. Note also
2375 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2376 * mutually exclusive, only one of these two should
2377 * be specified. Enabling both fields will have
2378 * undetermined results.
2380 * SPP_HB_DEMAND - Request a user initiated heartbeat
2381 * to be made immediately.
2383 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2384 * heartbeat delayis to be set to the value of 0
2387 * SPP_PMTUD_ENABLE - This field will enable PMTU
2388 * discovery upon the specified address. Note that
2389 * if the address feild is empty then all addresses
2390 * on the association are effected.
2392 * SPP_PMTUD_DISABLE - This field will disable PMTU
2393 * discovery upon the specified address. Note that
2394 * if the address feild is empty then all addresses
2395 * on the association are effected. Not also that
2396 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2397 * exclusive. Enabling both will have undetermined
2400 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2401 * on delayed sack. The time specified in spp_sackdelay
2402 * is used to specify the sack delay for this address. Note
2403 * that if spp_address is empty then all addresses will
2404 * enable delayed sack and take on the sack delay
2405 * value specified in spp_sackdelay.
2406 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2407 * off delayed sack. If the spp_address field is blank then
2408 * delayed sack is disabled for the entire association. Note
2409 * also that this field is mutually exclusive to
2410 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2413 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2414 struct sctp_transport
*trans
,
2415 struct sctp_association
*asoc
,
2416 struct sctp_sock
*sp
,
2419 int sackdelay_change
)
2423 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2424 struct net
*net
= sock_net(trans
->asoc
->base
.sk
);
2426 error
= sctp_primitive_REQUESTHEARTBEAT(net
, trans
->asoc
, trans
);
2431 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2432 * this field is ignored. Note also that a value of zero indicates
2433 * the current setting should be left unchanged.
2435 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2437 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2438 * set. This lets us use 0 value when this flag
2441 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2442 params
->spp_hbinterval
= 0;
2444 if (params
->spp_hbinterval
||
2445 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2448 msecs_to_jiffies(params
->spp_hbinterval
);
2451 msecs_to_jiffies(params
->spp_hbinterval
);
2453 sp
->hbinterval
= params
->spp_hbinterval
;
2460 trans
->param_flags
=
2461 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2464 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2467 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2471 /* When Path MTU discovery is disabled the value specified here will
2472 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2473 * include the flag SPP_PMTUD_DISABLE for this field to have any
2476 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2478 trans
->pathmtu
= params
->spp_pathmtu
;
2479 sctp_assoc_sync_pmtu(asoc
);
2481 asoc
->pathmtu
= params
->spp_pathmtu
;
2483 sp
->pathmtu
= params
->spp_pathmtu
;
2489 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2490 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2491 trans
->param_flags
=
2492 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2494 sctp_transport_pmtu(trans
, sctp_opt2sk(sp
));
2495 sctp_assoc_sync_pmtu(asoc
);
2499 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2502 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2506 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2507 * value of this field is ignored. Note also that a value of zero
2508 * indicates the current setting should be left unchanged.
2510 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2513 msecs_to_jiffies(params
->spp_sackdelay
);
2516 msecs_to_jiffies(params
->spp_sackdelay
);
2518 sp
->sackdelay
= params
->spp_sackdelay
;
2522 if (sackdelay_change
) {
2524 trans
->param_flags
=
2525 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2529 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2533 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2538 /* Note that a value of zero indicates the current setting should be
2541 if (params
->spp_pathmaxrxt
) {
2543 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2545 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2547 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2554 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2555 char __user
*optval
,
2556 unsigned int optlen
)
2558 struct sctp_paddrparams params
;
2559 struct sctp_transport
*trans
= NULL
;
2560 struct sctp_association
*asoc
= NULL
;
2561 struct sctp_sock
*sp
= sctp_sk(sk
);
2563 int hb_change
, pmtud_change
, sackdelay_change
;
2565 if (optlen
!= sizeof(struct sctp_paddrparams
))
2568 if (copy_from_user(¶ms
, optval
, optlen
))
2571 /* Validate flags and value parameters. */
2572 hb_change
= params
.spp_flags
& SPP_HB
;
2573 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2574 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2576 if (hb_change
== SPP_HB
||
2577 pmtud_change
== SPP_PMTUD
||
2578 sackdelay_change
== SPP_SACKDELAY
||
2579 params
.spp_sackdelay
> 500 ||
2580 (params
.spp_pathmtu
&&
2581 params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2584 /* If an address other than INADDR_ANY is specified, and
2585 * no transport is found, then the request is invalid.
2587 if (!sctp_is_any(sk
, (union sctp_addr
*)¶ms
.spp_address
)) {
2588 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2589 params
.spp_assoc_id
);
2594 /* Get association, if assoc_id != 0 and the socket is a one
2595 * to many style socket, and an association was not found, then
2596 * the id was invalid.
2598 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2599 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2602 /* Heartbeat demand can only be sent on a transport or
2603 * association, but not a socket.
2605 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2608 /* Process parameters. */
2609 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2610 hb_change
, pmtud_change
,
2616 /* If changes are for association, also apply parameters to each
2619 if (!trans
&& asoc
) {
2620 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2622 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2623 hb_change
, pmtud_change
,
2631 static inline __u32
sctp_spp_sackdelay_enable(__u32 param_flags
)
2633 return (param_flags
& ~SPP_SACKDELAY
) | SPP_SACKDELAY_ENABLE
;
2636 static inline __u32
sctp_spp_sackdelay_disable(__u32 param_flags
)
2638 return (param_flags
& ~SPP_SACKDELAY
) | SPP_SACKDELAY_DISABLE
;
2642 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2644 * This option will effect the way delayed acks are performed. This
2645 * option allows you to get or set the delayed ack time, in
2646 * milliseconds. It also allows changing the delayed ack frequency.
2647 * Changing the frequency to 1 disables the delayed sack algorithm. If
2648 * the assoc_id is 0, then this sets or gets the endpoints default
2649 * values. If the assoc_id field is non-zero, then the set or get
2650 * effects the specified association for the one to many model (the
2651 * assoc_id field is ignored by the one to one model). Note that if
2652 * sack_delay or sack_freq are 0 when setting this option, then the
2653 * current values will remain unchanged.
2655 * struct sctp_sack_info {
2656 * sctp_assoc_t sack_assoc_id;
2657 * uint32_t sack_delay;
2658 * uint32_t sack_freq;
2661 * sack_assoc_id - This parameter, indicates which association the user
2662 * is performing an action upon. Note that if this field's value is
2663 * zero then the endpoints default value is changed (effecting future
2664 * associations only).
2666 * sack_delay - This parameter contains the number of milliseconds that
2667 * the user is requesting the delayed ACK timer be set to. Note that
2668 * this value is defined in the standard to be between 200 and 500
2671 * sack_freq - This parameter contains the number of packets that must
2672 * be received before a sack is sent without waiting for the delay
2673 * timer to expire. The default value for this is 2, setting this
2674 * value to 1 will disable the delayed sack algorithm.
2677 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2678 char __user
*optval
, unsigned int optlen
)
2680 struct sctp_sack_info params
;
2681 struct sctp_transport
*trans
= NULL
;
2682 struct sctp_association
*asoc
= NULL
;
2683 struct sctp_sock
*sp
= sctp_sk(sk
);
2685 if (optlen
== sizeof(struct sctp_sack_info
)) {
2686 if (copy_from_user(¶ms
, optval
, optlen
))
2689 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2691 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2692 pr_warn_ratelimited(DEPRECATED
2694 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2695 "Use struct sctp_sack_info instead\n",
2696 current
->comm
, task_pid_nr(current
));
2697 if (copy_from_user(¶ms
, optval
, optlen
))
2700 if (params
.sack_delay
== 0)
2701 params
.sack_freq
= 1;
2703 params
.sack_freq
= 0;
2707 /* Validate value parameter. */
2708 if (params
.sack_delay
> 500)
2711 /* Get association, if sack_assoc_id != 0 and the socket is a one
2712 * to many style socket, and an association was not found, then
2713 * the id was invalid.
2715 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2716 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2719 if (params
.sack_delay
) {
2722 msecs_to_jiffies(params
.sack_delay
);
2724 sctp_spp_sackdelay_enable(asoc
->param_flags
);
2726 sp
->sackdelay
= params
.sack_delay
;
2728 sctp_spp_sackdelay_enable(sp
->param_flags
);
2732 if (params
.sack_freq
== 1) {
2735 sctp_spp_sackdelay_disable(asoc
->param_flags
);
2738 sctp_spp_sackdelay_disable(sp
->param_flags
);
2740 } else if (params
.sack_freq
> 1) {
2742 asoc
->sackfreq
= params
.sack_freq
;
2744 sctp_spp_sackdelay_enable(asoc
->param_flags
);
2746 sp
->sackfreq
= params
.sack_freq
;
2748 sctp_spp_sackdelay_enable(sp
->param_flags
);
2752 /* If change is for association, also apply to each transport. */
2754 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2756 if (params
.sack_delay
) {
2758 msecs_to_jiffies(params
.sack_delay
);
2759 trans
->param_flags
=
2760 sctp_spp_sackdelay_enable(trans
->param_flags
);
2762 if (params
.sack_freq
== 1) {
2763 trans
->param_flags
=
2764 sctp_spp_sackdelay_disable(trans
->param_flags
);
2765 } else if (params
.sack_freq
> 1) {
2766 trans
->sackfreq
= params
.sack_freq
;
2767 trans
->param_flags
=
2768 sctp_spp_sackdelay_enable(trans
->param_flags
);
2776 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2778 * Applications can specify protocol parameters for the default association
2779 * initialization. The option name argument to setsockopt() and getsockopt()
2782 * Setting initialization parameters is effective only on an unconnected
2783 * socket (for UDP-style sockets only future associations are effected
2784 * by the change). With TCP-style sockets, this option is inherited by
2785 * sockets derived from a listener socket.
2787 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2789 struct sctp_initmsg sinit
;
2790 struct sctp_sock
*sp
= sctp_sk(sk
);
2792 if (optlen
!= sizeof(struct sctp_initmsg
))
2794 if (copy_from_user(&sinit
, optval
, optlen
))
2797 if (sinit
.sinit_num_ostreams
)
2798 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2799 if (sinit
.sinit_max_instreams
)
2800 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2801 if (sinit
.sinit_max_attempts
)
2802 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2803 if (sinit
.sinit_max_init_timeo
)
2804 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2810 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2812 * Applications that wish to use the sendto() system call may wish to
2813 * specify a default set of parameters that would normally be supplied
2814 * through the inclusion of ancillary data. This socket option allows
2815 * such an application to set the default sctp_sndrcvinfo structure.
2816 * The application that wishes to use this socket option simply passes
2817 * in to this call the sctp_sndrcvinfo structure defined in Section
2818 * 5.2.2) The input parameters accepted by this call include
2819 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2820 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2821 * to this call if the caller is using the UDP model.
2823 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2824 char __user
*optval
,
2825 unsigned int optlen
)
2827 struct sctp_sock
*sp
= sctp_sk(sk
);
2828 struct sctp_association
*asoc
;
2829 struct sctp_sndrcvinfo info
;
2831 if (optlen
!= sizeof(info
))
2833 if (copy_from_user(&info
, optval
, optlen
))
2835 if (info
.sinfo_flags
&
2836 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
2837 SCTP_ABORT
| SCTP_EOF
))
2840 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2841 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2844 asoc
->default_stream
= info
.sinfo_stream
;
2845 asoc
->default_flags
= info
.sinfo_flags
;
2846 asoc
->default_ppid
= info
.sinfo_ppid
;
2847 asoc
->default_context
= info
.sinfo_context
;
2848 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2850 sp
->default_stream
= info
.sinfo_stream
;
2851 sp
->default_flags
= info
.sinfo_flags
;
2852 sp
->default_ppid
= info
.sinfo_ppid
;
2853 sp
->default_context
= info
.sinfo_context
;
2854 sp
->default_timetolive
= info
.sinfo_timetolive
;
2860 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2861 * (SCTP_DEFAULT_SNDINFO)
2863 static int sctp_setsockopt_default_sndinfo(struct sock
*sk
,
2864 char __user
*optval
,
2865 unsigned int optlen
)
2867 struct sctp_sock
*sp
= sctp_sk(sk
);
2868 struct sctp_association
*asoc
;
2869 struct sctp_sndinfo info
;
2871 if (optlen
!= sizeof(info
))
2873 if (copy_from_user(&info
, optval
, optlen
))
2875 if (info
.snd_flags
&
2876 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
2877 SCTP_ABORT
| SCTP_EOF
))
2880 asoc
= sctp_id2assoc(sk
, info
.snd_assoc_id
);
2881 if (!asoc
&& info
.snd_assoc_id
&& sctp_style(sk
, UDP
))
2884 asoc
->default_stream
= info
.snd_sid
;
2885 asoc
->default_flags
= info
.snd_flags
;
2886 asoc
->default_ppid
= info
.snd_ppid
;
2887 asoc
->default_context
= info
.snd_context
;
2889 sp
->default_stream
= info
.snd_sid
;
2890 sp
->default_flags
= info
.snd_flags
;
2891 sp
->default_ppid
= info
.snd_ppid
;
2892 sp
->default_context
= info
.snd_context
;
2898 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2900 * Requests that the local SCTP stack use the enclosed peer address as
2901 * the association primary. The enclosed address must be one of the
2902 * association peer's addresses.
2904 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2905 unsigned int optlen
)
2907 struct sctp_prim prim
;
2908 struct sctp_transport
*trans
;
2910 if (optlen
!= sizeof(struct sctp_prim
))
2913 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2916 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2920 sctp_assoc_set_primary(trans
->asoc
, trans
);
2926 * 7.1.5 SCTP_NODELAY
2928 * Turn on/off any Nagle-like algorithm. This means that packets are
2929 * generally sent as soon as possible and no unnecessary delays are
2930 * introduced, at the cost of more packets in the network. Expects an
2931 * integer boolean flag.
2933 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2934 unsigned int optlen
)
2938 if (optlen
< sizeof(int))
2940 if (get_user(val
, (int __user
*)optval
))
2943 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2949 * 7.1.1 SCTP_RTOINFO
2951 * The protocol parameters used to initialize and bound retransmission
2952 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2953 * and modify these parameters.
2954 * All parameters are time values, in milliseconds. A value of 0, when
2955 * modifying the parameters, indicates that the current value should not
2959 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2961 struct sctp_rtoinfo rtoinfo
;
2962 struct sctp_association
*asoc
;
2963 unsigned long rto_min
, rto_max
;
2964 struct sctp_sock
*sp
= sctp_sk(sk
);
2966 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2969 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2972 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2974 /* Set the values to the specific association */
2975 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2978 rto_max
= rtoinfo
.srto_max
;
2979 rto_min
= rtoinfo
.srto_min
;
2982 rto_max
= asoc
? msecs_to_jiffies(rto_max
) : rto_max
;
2984 rto_max
= asoc
? asoc
->rto_max
: sp
->rtoinfo
.srto_max
;
2987 rto_min
= asoc
? msecs_to_jiffies(rto_min
) : rto_min
;
2989 rto_min
= asoc
? asoc
->rto_min
: sp
->rtoinfo
.srto_min
;
2991 if (rto_min
> rto_max
)
2995 if (rtoinfo
.srto_initial
!= 0)
2997 msecs_to_jiffies(rtoinfo
.srto_initial
);
2998 asoc
->rto_max
= rto_max
;
2999 asoc
->rto_min
= rto_min
;
3001 /* If there is no association or the association-id = 0
3002 * set the values to the endpoint.
3004 if (rtoinfo
.srto_initial
!= 0)
3005 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
3006 sp
->rtoinfo
.srto_max
= rto_max
;
3007 sp
->rtoinfo
.srto_min
= rto_min
;
3015 * 7.1.2 SCTP_ASSOCINFO
3017 * This option is used to tune the maximum retransmission attempts
3018 * of the association.
3019 * Returns an error if the new association retransmission value is
3020 * greater than the sum of the retransmission value of the peer.
3021 * See [SCTP] for more information.
3024 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
3027 struct sctp_assocparams assocparams
;
3028 struct sctp_association
*asoc
;
3030 if (optlen
!= sizeof(struct sctp_assocparams
))
3032 if (copy_from_user(&assocparams
, optval
, optlen
))
3035 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
3037 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
3040 /* Set the values to the specific association */
3042 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
3045 struct sctp_transport
*peer_addr
;
3047 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
3049 path_sum
+= peer_addr
->pathmaxrxt
;
3053 /* Only validate asocmaxrxt if we have more than
3054 * one path/transport. We do this because path
3055 * retransmissions are only counted when we have more
3059 assocparams
.sasoc_asocmaxrxt
> path_sum
)
3062 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
3065 if (assocparams
.sasoc_cookie_life
!= 0)
3066 asoc
->cookie_life
= ms_to_ktime(assocparams
.sasoc_cookie_life
);
3068 /* Set the values to the endpoint */
3069 struct sctp_sock
*sp
= sctp_sk(sk
);
3071 if (assocparams
.sasoc_asocmaxrxt
!= 0)
3072 sp
->assocparams
.sasoc_asocmaxrxt
=
3073 assocparams
.sasoc_asocmaxrxt
;
3074 if (assocparams
.sasoc_cookie_life
!= 0)
3075 sp
->assocparams
.sasoc_cookie_life
=
3076 assocparams
.sasoc_cookie_life
;
3082 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3084 * This socket option is a boolean flag which turns on or off mapped V4
3085 * addresses. If this option is turned on and the socket is type
3086 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3087 * If this option is turned off, then no mapping will be done of V4
3088 * addresses and a user will receive both PF_INET6 and PF_INET type
3089 * addresses on the socket.
3091 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
3094 struct sctp_sock
*sp
= sctp_sk(sk
);
3096 if (optlen
< sizeof(int))
3098 if (get_user(val
, (int __user
*)optval
))
3109 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3110 * This option will get or set the maximum size to put in any outgoing
3111 * SCTP DATA chunk. If a message is larger than this size it will be
3112 * fragmented by SCTP into the specified size. Note that the underlying
3113 * SCTP implementation may fragment into smaller sized chunks when the
3114 * PMTU of the underlying association is smaller than the value set by
3115 * the user. The default value for this option is '0' which indicates
3116 * the user is NOT limiting fragmentation and only the PMTU will effect
3117 * SCTP's choice of DATA chunk size. Note also that values set larger
3118 * than the maximum size of an IP datagram will effectively let SCTP
3119 * control fragmentation (i.e. the same as setting this option to 0).
3121 * The following structure is used to access and modify this parameter:
3123 * struct sctp_assoc_value {
3124 * sctp_assoc_t assoc_id;
3125 * uint32_t assoc_value;
3128 * assoc_id: This parameter is ignored for one-to-one style sockets.
3129 * For one-to-many style sockets this parameter indicates which
3130 * association the user is performing an action upon. Note that if
3131 * this field's value is zero then the endpoints default value is
3132 * changed (effecting future associations only).
3133 * assoc_value: This parameter specifies the maximum size in bytes.
3135 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
3137 struct sctp_sock
*sp
= sctp_sk(sk
);
3138 struct sctp_assoc_value params
;
3139 struct sctp_association
*asoc
;
3142 if (optlen
== sizeof(int)) {
3143 pr_warn_ratelimited(DEPRECATED
3145 "Use of int in maxseg socket option.\n"
3146 "Use struct sctp_assoc_value instead\n",
3147 current
->comm
, task_pid_nr(current
));
3148 if (copy_from_user(&val
, optval
, optlen
))
3150 params
.assoc_id
= 0;
3151 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3152 if (copy_from_user(¶ms
, optval
, optlen
))
3154 val
= params
.assoc_value
;
3160 int min_len
, max_len
;
3162 min_len
= SCTP_DEFAULT_MINSEGMENT
- sp
->pf
->af
->net_header_len
;
3163 min_len
-= sizeof(struct sctphdr
) +
3164 sizeof(struct sctp_data_chunk
);
3166 max_len
= SCTP_MAX_CHUNK_LEN
- sizeof(struct sctp_data_chunk
);
3168 if (val
< min_len
|| val
> max_len
)
3172 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3175 val
= asoc
->pathmtu
- sp
->pf
->af
->net_header_len
;
3176 val
-= sizeof(struct sctphdr
) +
3177 sizeof(struct sctp_data_chunk
);
3179 asoc
->user_frag
= val
;
3180 asoc
->frag_point
= sctp_frag_point(asoc
, asoc
->pathmtu
);
3182 if (params
.assoc_id
&& sctp_style(sk
, UDP
))
3184 sp
->user_frag
= val
;
3192 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3194 * Requests that the peer mark the enclosed address as the association
3195 * primary. The enclosed address must be one of the association's
3196 * locally bound addresses. The following structure is used to make a
3197 * set primary request:
3199 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
3200 unsigned int optlen
)
3202 struct net
*net
= sock_net(sk
);
3203 struct sctp_sock
*sp
;
3204 struct sctp_association
*asoc
= NULL
;
3205 struct sctp_setpeerprim prim
;
3206 struct sctp_chunk
*chunk
;
3212 if (!net
->sctp
.addip_enable
)
3215 if (optlen
!= sizeof(struct sctp_setpeerprim
))
3218 if (copy_from_user(&prim
, optval
, optlen
))
3221 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
3225 if (!asoc
->peer
.asconf_capable
)
3228 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
3231 if (!sctp_state(asoc
, ESTABLISHED
))
3234 af
= sctp_get_af_specific(prim
.sspp_addr
.ss_family
);
3238 if (!af
->addr_valid((union sctp_addr
*)&prim
.sspp_addr
, sp
, NULL
))
3239 return -EADDRNOTAVAIL
;
3241 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
3242 return -EADDRNOTAVAIL
;
3244 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3245 chunk
= sctp_make_asconf_set_prim(asoc
,
3246 (union sctp_addr
*)&prim
.sspp_addr
);
3250 err
= sctp_send_asconf(asoc
, chunk
);
3252 pr_debug("%s: we set peer primary addr primitively\n", __func__
);
3257 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
3258 unsigned int optlen
)
3260 struct sctp_setadaptation adaptation
;
3262 if (optlen
!= sizeof(struct sctp_setadaptation
))
3264 if (copy_from_user(&adaptation
, optval
, optlen
))
3267 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
3273 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3275 * The context field in the sctp_sndrcvinfo structure is normally only
3276 * used when a failed message is retrieved holding the value that was
3277 * sent down on the actual send call. This option allows the setting of
3278 * a default context on an association basis that will be received on
3279 * reading messages from the peer. This is especially helpful in the
3280 * one-2-many model for an application to keep some reference to an
3281 * internal state machine that is processing messages on the
3282 * association. Note that the setting of this value only effects
3283 * received messages from the peer and does not effect the value that is
3284 * saved with outbound messages.
3286 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
3287 unsigned int optlen
)
3289 struct sctp_assoc_value params
;
3290 struct sctp_sock
*sp
;
3291 struct sctp_association
*asoc
;
3293 if (optlen
!= sizeof(struct sctp_assoc_value
))
3295 if (copy_from_user(¶ms
, optval
, optlen
))
3300 if (params
.assoc_id
!= 0) {
3301 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3304 asoc
->default_rcv_context
= params
.assoc_value
;
3306 sp
->default_rcv_context
= params
.assoc_value
;
3313 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3315 * This options will at a minimum specify if the implementation is doing
3316 * fragmented interleave. Fragmented interleave, for a one to many
3317 * socket, is when subsequent calls to receive a message may return
3318 * parts of messages from different associations. Some implementations
3319 * may allow you to turn this value on or off. If so, when turned off,
3320 * no fragment interleave will occur (which will cause a head of line
3321 * blocking amongst multiple associations sharing the same one to many
3322 * socket). When this option is turned on, then each receive call may
3323 * come from a different association (thus the user must receive data
3324 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3325 * association each receive belongs to.
3327 * This option takes a boolean value. A non-zero value indicates that
3328 * fragmented interleave is on. A value of zero indicates that
3329 * fragmented interleave is off.
3331 * Note that it is important that an implementation that allows this
3332 * option to be turned on, have it off by default. Otherwise an unaware
3333 * application using the one to many model may become confused and act
3336 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
3337 char __user
*optval
,
3338 unsigned int optlen
)
3342 if (optlen
!= sizeof(int))
3344 if (get_user(val
, (int __user
*)optval
))
3347 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
3353 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3354 * (SCTP_PARTIAL_DELIVERY_POINT)
3356 * This option will set or get the SCTP partial delivery point. This
3357 * point is the size of a message where the partial delivery API will be
3358 * invoked to help free up rwnd space for the peer. Setting this to a
3359 * lower value will cause partial deliveries to happen more often. The
3360 * calls argument is an integer that sets or gets the partial delivery
3361 * point. Note also that the call will fail if the user attempts to set
3362 * this value larger than the socket receive buffer size.
3364 * Note that any single message having a length smaller than or equal to
3365 * the SCTP partial delivery point will be delivered in one single read
3366 * call as long as the user provided buffer is large enough to hold the
3369 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
3370 char __user
*optval
,
3371 unsigned int optlen
)
3375 if (optlen
!= sizeof(u32
))
3377 if (get_user(val
, (int __user
*)optval
))
3380 /* Note: We double the receive buffer from what the user sets
3381 * it to be, also initial rwnd is based on rcvbuf/2.
3383 if (val
> (sk
->sk_rcvbuf
>> 1))
3386 sctp_sk(sk
)->pd_point
= val
;
3388 return 0; /* is this the right error code? */
3392 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3394 * This option will allow a user to change the maximum burst of packets
3395 * that can be emitted by this association. Note that the default value
3396 * is 4, and some implementations may restrict this setting so that it
3397 * can only be lowered.
3399 * NOTE: This text doesn't seem right. Do this on a socket basis with
3400 * future associations inheriting the socket value.
3402 static int sctp_setsockopt_maxburst(struct sock
*sk
,
3403 char __user
*optval
,
3404 unsigned int optlen
)
3406 struct sctp_assoc_value params
;
3407 struct sctp_sock
*sp
;
3408 struct sctp_association
*asoc
;
3412 if (optlen
== sizeof(int)) {
3413 pr_warn_ratelimited(DEPRECATED
3415 "Use of int in max_burst socket option deprecated.\n"
3416 "Use struct sctp_assoc_value instead\n",
3417 current
->comm
, task_pid_nr(current
));
3418 if (copy_from_user(&val
, optval
, optlen
))
3420 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3421 if (copy_from_user(¶ms
, optval
, optlen
))
3423 val
= params
.assoc_value
;
3424 assoc_id
= params
.assoc_id
;
3430 if (assoc_id
!= 0) {
3431 asoc
= sctp_id2assoc(sk
, assoc_id
);
3434 asoc
->max_burst
= val
;
3436 sp
->max_burst
= val
;
3442 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3444 * This set option adds a chunk type that the user is requesting to be
3445 * received only in an authenticated way. Changes to the list of chunks
3446 * will only effect future associations on the socket.
3448 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
3449 char __user
*optval
,
3450 unsigned int optlen
)
3452 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3453 struct sctp_authchunk val
;
3455 if (!ep
->auth_enable
)
3458 if (optlen
!= sizeof(struct sctp_authchunk
))
3460 if (copy_from_user(&val
, optval
, optlen
))
3463 switch (val
.sauth_chunk
) {
3465 case SCTP_CID_INIT_ACK
:
3466 case SCTP_CID_SHUTDOWN_COMPLETE
:
3471 /* add this chunk id to the endpoint */
3472 return sctp_auth_ep_add_chunkid(ep
, val
.sauth_chunk
);
3476 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3478 * This option gets or sets the list of HMAC algorithms that the local
3479 * endpoint requires the peer to use.
3481 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
3482 char __user
*optval
,
3483 unsigned int optlen
)
3485 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3486 struct sctp_hmacalgo
*hmacs
;
3490 if (!ep
->auth_enable
)
3493 if (optlen
< sizeof(struct sctp_hmacalgo
))
3495 optlen
= min_t(unsigned int, optlen
, sizeof(struct sctp_hmacalgo
) +
3496 SCTP_AUTH_NUM_HMACS
* sizeof(u16
));
3498 hmacs
= memdup_user(optval
, optlen
);
3500 return PTR_ERR(hmacs
);
3502 idents
= hmacs
->shmac_num_idents
;
3503 if (idents
== 0 || idents
> SCTP_AUTH_NUM_HMACS
||
3504 (idents
* sizeof(u16
)) > (optlen
- sizeof(struct sctp_hmacalgo
))) {
3509 err
= sctp_auth_ep_set_hmacs(ep
, hmacs
);
3516 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3518 * This option will set a shared secret key which is used to build an
3519 * association shared key.
3521 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3522 char __user
*optval
,
3523 unsigned int optlen
)
3525 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3526 struct sctp_authkey
*authkey
;
3527 struct sctp_association
*asoc
;
3530 if (!ep
->auth_enable
)
3533 if (optlen
<= sizeof(struct sctp_authkey
))
3535 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3538 optlen
= min_t(unsigned int, optlen
, USHRT_MAX
+
3539 sizeof(struct sctp_authkey
));
3541 authkey
= memdup_user(optval
, optlen
);
3542 if (IS_ERR(authkey
))
3543 return PTR_ERR(authkey
);
3545 if (authkey
->sca_keylength
> optlen
- sizeof(struct sctp_authkey
)) {
3550 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3551 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3556 ret
= sctp_auth_set_key(ep
, asoc
, authkey
);
3563 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3565 * This option will get or set the active shared key to be used to build
3566 * the association shared key.
3568 static int sctp_setsockopt_active_key(struct sock
*sk
,
3569 char __user
*optval
,
3570 unsigned int optlen
)
3572 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3573 struct sctp_authkeyid val
;
3574 struct sctp_association
*asoc
;
3576 if (!ep
->auth_enable
)
3579 if (optlen
!= sizeof(struct sctp_authkeyid
))
3581 if (copy_from_user(&val
, optval
, optlen
))
3584 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3585 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3588 return sctp_auth_set_active_key(ep
, asoc
, val
.scact_keynumber
);
3592 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3594 * This set option will delete a shared secret key from use.
3596 static int sctp_setsockopt_del_key(struct sock
*sk
,
3597 char __user
*optval
,
3598 unsigned int optlen
)
3600 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3601 struct sctp_authkeyid val
;
3602 struct sctp_association
*asoc
;
3604 if (!ep
->auth_enable
)
3607 if (optlen
!= sizeof(struct sctp_authkeyid
))
3609 if (copy_from_user(&val
, optval
, optlen
))
3612 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3613 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3616 return sctp_auth_del_key_id(ep
, asoc
, val
.scact_keynumber
);
3621 * 8.1.23 SCTP_AUTO_ASCONF
3623 * This option will enable or disable the use of the automatic generation of
3624 * ASCONF chunks to add and delete addresses to an existing association. Note
3625 * that this option has two caveats namely: a) it only affects sockets that
3626 * are bound to all addresses available to the SCTP stack, and b) the system
3627 * administrator may have an overriding control that turns the ASCONF feature
3628 * off no matter what setting the socket option may have.
3629 * This option expects an integer boolean flag, where a non-zero value turns on
3630 * the option, and a zero value turns off the option.
3631 * Note. In this implementation, socket operation overrides default parameter
3632 * being set by sysctl as well as FreeBSD implementation
3634 static int sctp_setsockopt_auto_asconf(struct sock
*sk
, char __user
*optval
,
3635 unsigned int optlen
)
3638 struct sctp_sock
*sp
= sctp_sk(sk
);
3640 if (optlen
< sizeof(int))
3642 if (get_user(val
, (int __user
*)optval
))
3644 if (!sctp_is_ep_boundall(sk
) && val
)
3646 if ((val
&& sp
->do_auto_asconf
) || (!val
&& !sp
->do_auto_asconf
))
3649 spin_lock_bh(&sock_net(sk
)->sctp
.addr_wq_lock
);
3650 if (val
== 0 && sp
->do_auto_asconf
) {
3651 list_del(&sp
->auto_asconf_list
);
3652 sp
->do_auto_asconf
= 0;
3653 } else if (val
&& !sp
->do_auto_asconf
) {
3654 list_add_tail(&sp
->auto_asconf_list
,
3655 &sock_net(sk
)->sctp
.auto_asconf_splist
);
3656 sp
->do_auto_asconf
= 1;
3658 spin_unlock_bh(&sock_net(sk
)->sctp
.addr_wq_lock
);
3663 * SCTP_PEER_ADDR_THLDS
3665 * This option allows us to alter the partially failed threshold for one or all
3666 * transports in an association. See Section 6.1 of:
3667 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3669 static int sctp_setsockopt_paddr_thresholds(struct sock
*sk
,
3670 char __user
*optval
,
3671 unsigned int optlen
)
3673 struct sctp_paddrthlds val
;
3674 struct sctp_transport
*trans
;
3675 struct sctp_association
*asoc
;
3677 if (optlen
< sizeof(struct sctp_paddrthlds
))
3679 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
,
3680 sizeof(struct sctp_paddrthlds
)))
3684 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
3685 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
3688 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
3690 if (val
.spt_pathmaxrxt
)
3691 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3692 trans
->pf_retrans
= val
.spt_pathpfthld
;
3695 if (val
.spt_pathmaxrxt
)
3696 asoc
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3697 asoc
->pf_retrans
= val
.spt_pathpfthld
;
3699 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
3704 if (val
.spt_pathmaxrxt
)
3705 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3706 trans
->pf_retrans
= val
.spt_pathpfthld
;
3712 static int sctp_setsockopt_recvrcvinfo(struct sock
*sk
,
3713 char __user
*optval
,
3714 unsigned int optlen
)
3718 if (optlen
< sizeof(int))
3720 if (get_user(val
, (int __user
*) optval
))
3723 sctp_sk(sk
)->recvrcvinfo
= (val
== 0) ? 0 : 1;
3728 static int sctp_setsockopt_recvnxtinfo(struct sock
*sk
,
3729 char __user
*optval
,
3730 unsigned int optlen
)
3734 if (optlen
< sizeof(int))
3736 if (get_user(val
, (int __user
*) optval
))
3739 sctp_sk(sk
)->recvnxtinfo
= (val
== 0) ? 0 : 1;
3744 static int sctp_setsockopt_pr_supported(struct sock
*sk
,
3745 char __user
*optval
,
3746 unsigned int optlen
)
3748 struct sctp_assoc_value params
;
3750 if (optlen
!= sizeof(params
))
3753 if (copy_from_user(¶ms
, optval
, optlen
))
3756 sctp_sk(sk
)->ep
->prsctp_enable
= !!params
.assoc_value
;
3761 static int sctp_setsockopt_default_prinfo(struct sock
*sk
,
3762 char __user
*optval
,
3763 unsigned int optlen
)
3765 struct sctp_default_prinfo info
;
3766 struct sctp_association
*asoc
;
3767 int retval
= -EINVAL
;
3769 if (optlen
!= sizeof(info
))
3772 if (copy_from_user(&info
, optval
, sizeof(info
))) {
3777 if (info
.pr_policy
& ~SCTP_PR_SCTP_MASK
)
3780 if (info
.pr_policy
== SCTP_PR_SCTP_NONE
)
3783 asoc
= sctp_id2assoc(sk
, info
.pr_assoc_id
);
3785 SCTP_PR_SET_POLICY(asoc
->default_flags
, info
.pr_policy
);
3786 asoc
->default_timetolive
= info
.pr_value
;
3787 } else if (!info
.pr_assoc_id
) {
3788 struct sctp_sock
*sp
= sctp_sk(sk
);
3790 SCTP_PR_SET_POLICY(sp
->default_flags
, info
.pr_policy
);
3791 sp
->default_timetolive
= info
.pr_value
;
3802 static int sctp_setsockopt_reconfig_supported(struct sock
*sk
,
3803 char __user
*optval
,
3804 unsigned int optlen
)
3806 struct sctp_assoc_value params
;
3807 struct sctp_association
*asoc
;
3808 int retval
= -EINVAL
;
3810 if (optlen
!= sizeof(params
))
3813 if (copy_from_user(¶ms
, optval
, optlen
)) {
3818 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3820 asoc
->reconf_enable
= !!params
.assoc_value
;
3821 } else if (!params
.assoc_id
) {
3822 struct sctp_sock
*sp
= sctp_sk(sk
);
3824 sp
->ep
->reconf_enable
= !!params
.assoc_value
;
3835 static int sctp_setsockopt_enable_strreset(struct sock
*sk
,
3836 char __user
*optval
,
3837 unsigned int optlen
)
3839 struct sctp_assoc_value params
;
3840 struct sctp_association
*asoc
;
3841 int retval
= -EINVAL
;
3843 if (optlen
!= sizeof(params
))
3846 if (copy_from_user(¶ms
, optval
, optlen
)) {
3851 if (params
.assoc_value
& (~SCTP_ENABLE_STRRESET_MASK
))
3854 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3856 asoc
->strreset_enable
= params
.assoc_value
;
3857 } else if (!params
.assoc_id
) {
3858 struct sctp_sock
*sp
= sctp_sk(sk
);
3860 sp
->ep
->strreset_enable
= params
.assoc_value
;
3871 static int sctp_setsockopt_reset_streams(struct sock
*sk
,
3872 char __user
*optval
,
3873 unsigned int optlen
)
3875 struct sctp_reset_streams
*params
;
3876 struct sctp_association
*asoc
;
3877 int retval
= -EINVAL
;
3879 if (optlen
< sizeof(*params
))
3881 /* srs_number_streams is u16, so optlen can't be bigger than this. */
3882 optlen
= min_t(unsigned int, optlen
, USHRT_MAX
+
3883 sizeof(__u16
) * sizeof(*params
));
3885 params
= memdup_user(optval
, optlen
);
3887 return PTR_ERR(params
);
3889 if (params
->srs_number_streams
* sizeof(__u16
) >
3890 optlen
- sizeof(*params
))
3893 asoc
= sctp_id2assoc(sk
, params
->srs_assoc_id
);
3897 retval
= sctp_send_reset_streams(asoc
, params
);
3904 static int sctp_setsockopt_reset_assoc(struct sock
*sk
,
3905 char __user
*optval
,
3906 unsigned int optlen
)
3908 struct sctp_association
*asoc
;
3909 sctp_assoc_t associd
;
3910 int retval
= -EINVAL
;
3912 if (optlen
!= sizeof(associd
))
3915 if (copy_from_user(&associd
, optval
, optlen
)) {
3920 asoc
= sctp_id2assoc(sk
, associd
);
3924 retval
= sctp_send_reset_assoc(asoc
);
3930 static int sctp_setsockopt_add_streams(struct sock
*sk
,
3931 char __user
*optval
,
3932 unsigned int optlen
)
3934 struct sctp_association
*asoc
;
3935 struct sctp_add_streams params
;
3936 int retval
= -EINVAL
;
3938 if (optlen
!= sizeof(params
))
3941 if (copy_from_user(¶ms
, optval
, optlen
)) {
3946 asoc
= sctp_id2assoc(sk
, params
.sas_assoc_id
);
3950 retval
= sctp_send_add_streams(asoc
, ¶ms
);
3956 static int sctp_setsockopt_scheduler(struct sock
*sk
,
3957 char __user
*optval
,
3958 unsigned int optlen
)
3960 struct sctp_association
*asoc
;
3961 struct sctp_assoc_value params
;
3962 int retval
= -EINVAL
;
3964 if (optlen
< sizeof(params
))
3967 optlen
= sizeof(params
);
3968 if (copy_from_user(¶ms
, optval
, optlen
)) {
3973 if (params
.assoc_value
> SCTP_SS_MAX
)
3976 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3980 retval
= sctp_sched_set_sched(asoc
, params
.assoc_value
);
3986 static int sctp_setsockopt_scheduler_value(struct sock
*sk
,
3987 char __user
*optval
,
3988 unsigned int optlen
)
3990 struct sctp_association
*asoc
;
3991 struct sctp_stream_value params
;
3992 int retval
= -EINVAL
;
3994 if (optlen
< sizeof(params
))
3997 optlen
= sizeof(params
);
3998 if (copy_from_user(¶ms
, optval
, optlen
)) {
4003 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
4007 retval
= sctp_sched_set_value(asoc
, params
.stream_id
,
4008 params
.stream_value
, GFP_KERNEL
);
4014 /* API 6.2 setsockopt(), getsockopt()
4016 * Applications use setsockopt() and getsockopt() to set or retrieve
4017 * socket options. Socket options are used to change the default
4018 * behavior of sockets calls. They are described in Section 7.
4022 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4023 * int __user *optlen);
4024 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4027 * sd - the socket descript.
4028 * level - set to IPPROTO_SCTP for all SCTP options.
4029 * optname - the option name.
4030 * optval - the buffer to store the value of the option.
4031 * optlen - the size of the buffer.
4033 static int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
4034 char __user
*optval
, unsigned int optlen
)
4038 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
4040 /* I can hardly begin to describe how wrong this is. This is
4041 * so broken as to be worse than useless. The API draft
4042 * REALLY is NOT helpful here... I am not convinced that the
4043 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4044 * are at all well-founded.
4046 if (level
!= SOL_SCTP
) {
4047 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
4048 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
4055 case SCTP_SOCKOPT_BINDX_ADD
:
4056 /* 'optlen' is the size of the addresses buffer. */
4057 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
4058 optlen
, SCTP_BINDX_ADD_ADDR
);
4061 case SCTP_SOCKOPT_BINDX_REM
:
4062 /* 'optlen' is the size of the addresses buffer. */
4063 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
4064 optlen
, SCTP_BINDX_REM_ADDR
);
4067 case SCTP_SOCKOPT_CONNECTX_OLD
:
4068 /* 'optlen' is the size of the addresses buffer. */
4069 retval
= sctp_setsockopt_connectx_old(sk
,
4070 (struct sockaddr __user
*)optval
,
4074 case SCTP_SOCKOPT_CONNECTX
:
4075 /* 'optlen' is the size of the addresses buffer. */
4076 retval
= sctp_setsockopt_connectx(sk
,
4077 (struct sockaddr __user
*)optval
,
4081 case SCTP_DISABLE_FRAGMENTS
:
4082 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
4086 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
4089 case SCTP_AUTOCLOSE
:
4090 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
4093 case SCTP_PEER_ADDR_PARAMS
:
4094 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
4097 case SCTP_DELAYED_SACK
:
4098 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
4100 case SCTP_PARTIAL_DELIVERY_POINT
:
4101 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
4105 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
4107 case SCTP_DEFAULT_SEND_PARAM
:
4108 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
4111 case SCTP_DEFAULT_SNDINFO
:
4112 retval
= sctp_setsockopt_default_sndinfo(sk
, optval
, optlen
);
4114 case SCTP_PRIMARY_ADDR
:
4115 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
4117 case SCTP_SET_PEER_PRIMARY_ADDR
:
4118 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
4121 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
4124 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
4126 case SCTP_ASSOCINFO
:
4127 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
4129 case SCTP_I_WANT_MAPPED_V4_ADDR
:
4130 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
4133 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
4135 case SCTP_ADAPTATION_LAYER
:
4136 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
4139 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
4141 case SCTP_FRAGMENT_INTERLEAVE
:
4142 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
4144 case SCTP_MAX_BURST
:
4145 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
4147 case SCTP_AUTH_CHUNK
:
4148 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
4150 case SCTP_HMAC_IDENT
:
4151 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
4154 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
4156 case SCTP_AUTH_ACTIVE_KEY
:
4157 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
4159 case SCTP_AUTH_DELETE_KEY
:
4160 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
4162 case SCTP_AUTO_ASCONF
:
4163 retval
= sctp_setsockopt_auto_asconf(sk
, optval
, optlen
);
4165 case SCTP_PEER_ADDR_THLDS
:
4166 retval
= sctp_setsockopt_paddr_thresholds(sk
, optval
, optlen
);
4168 case SCTP_RECVRCVINFO
:
4169 retval
= sctp_setsockopt_recvrcvinfo(sk
, optval
, optlen
);
4171 case SCTP_RECVNXTINFO
:
4172 retval
= sctp_setsockopt_recvnxtinfo(sk
, optval
, optlen
);
4174 case SCTP_PR_SUPPORTED
:
4175 retval
= sctp_setsockopt_pr_supported(sk
, optval
, optlen
);
4177 case SCTP_DEFAULT_PRINFO
:
4178 retval
= sctp_setsockopt_default_prinfo(sk
, optval
, optlen
);
4180 case SCTP_RECONFIG_SUPPORTED
:
4181 retval
= sctp_setsockopt_reconfig_supported(sk
, optval
, optlen
);
4183 case SCTP_ENABLE_STREAM_RESET
:
4184 retval
= sctp_setsockopt_enable_strreset(sk
, optval
, optlen
);
4186 case SCTP_RESET_STREAMS
:
4187 retval
= sctp_setsockopt_reset_streams(sk
, optval
, optlen
);
4189 case SCTP_RESET_ASSOC
:
4190 retval
= sctp_setsockopt_reset_assoc(sk
, optval
, optlen
);
4192 case SCTP_ADD_STREAMS
:
4193 retval
= sctp_setsockopt_add_streams(sk
, optval
, optlen
);
4195 case SCTP_STREAM_SCHEDULER
:
4196 retval
= sctp_setsockopt_scheduler(sk
, optval
, optlen
);
4198 case SCTP_STREAM_SCHEDULER_VALUE
:
4199 retval
= sctp_setsockopt_scheduler_value(sk
, optval
, optlen
);
4202 retval
= -ENOPROTOOPT
;
4212 /* API 3.1.6 connect() - UDP Style Syntax
4214 * An application may use the connect() call in the UDP model to initiate an
4215 * association without sending data.
4219 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4221 * sd: the socket descriptor to have a new association added to.
4223 * nam: the address structure (either struct sockaddr_in or struct
4224 * sockaddr_in6 defined in RFC2553 [7]).
4226 * len: the size of the address.
4228 static int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
4229 int addr_len
, int flags
)
4235 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__
, sk
,
4238 /* Validate addr_len before calling common connect/connectx routine. */
4239 af
= sctp_get_af_specific(addr
->sa_family
);
4240 if (af
&& addr_len
>= af
->sockaddr_len
)
4241 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, flags
, NULL
);
4247 int sctp_inet_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
4248 int addr_len
, int flags
)
4250 if (addr_len
< sizeof(uaddr
->sa_family
))
4253 if (uaddr
->sa_family
== AF_UNSPEC
)
4256 return sctp_connect(sock
->sk
, uaddr
, addr_len
, flags
);
4259 /* FIXME: Write comments. */
4260 static int sctp_disconnect(struct sock
*sk
, int flags
)
4262 return -EOPNOTSUPP
; /* STUB */
4265 /* 4.1.4 accept() - TCP Style Syntax
4267 * Applications use accept() call to remove an established SCTP
4268 * association from the accept queue of the endpoint. A new socket
4269 * descriptor will be returned from accept() to represent the newly
4270 * formed association.
4272 static struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
, bool kern
)
4274 struct sctp_sock
*sp
;
4275 struct sctp_endpoint
*ep
;
4276 struct sock
*newsk
= NULL
;
4277 struct sctp_association
*asoc
;
4286 if (!sctp_style(sk
, TCP
)) {
4287 error
= -EOPNOTSUPP
;
4291 if (!sctp_sstate(sk
, LISTENING
)) {
4296 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
4298 error
= sctp_wait_for_accept(sk
, timeo
);
4302 /* We treat the list of associations on the endpoint as the accept
4303 * queue and pick the first association on the list.
4305 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
4307 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
, kern
);
4313 /* Populate the fields of the newsk from the oldsk and migrate the
4314 * asoc to the newsk.
4316 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
4324 /* The SCTP ioctl handler. */
4325 static int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
4332 * SEQPACKET-style sockets in LISTENING state are valid, for
4333 * SCTP, so only discard TCP-style sockets in LISTENING state.
4335 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
4340 struct sk_buff
*skb
;
4341 unsigned int amount
= 0;
4343 skb
= skb_peek(&sk
->sk_receive_queue
);
4346 * We will only return the amount of this packet since
4347 * that is all that will be read.
4351 rc
= put_user(amount
, (int __user
*)arg
);
4363 /* This is the function which gets called during socket creation to
4364 * initialized the SCTP-specific portion of the sock.
4365 * The sock structure should already be zero-filled memory.
4367 static int sctp_init_sock(struct sock
*sk
)
4369 struct net
*net
= sock_net(sk
);
4370 struct sctp_sock
*sp
;
4372 pr_debug("%s: sk:%p\n", __func__
, sk
);
4376 /* Initialize the SCTP per socket area. */
4377 switch (sk
->sk_type
) {
4378 case SOCK_SEQPACKET
:
4379 sp
->type
= SCTP_SOCKET_UDP
;
4382 sp
->type
= SCTP_SOCKET_TCP
;
4385 return -ESOCKTNOSUPPORT
;
4388 sk
->sk_gso_type
= SKB_GSO_SCTP
;
4390 /* Initialize default send parameters. These parameters can be
4391 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4393 sp
->default_stream
= 0;
4394 sp
->default_ppid
= 0;
4395 sp
->default_flags
= 0;
4396 sp
->default_context
= 0;
4397 sp
->default_timetolive
= 0;
4399 sp
->default_rcv_context
= 0;
4400 sp
->max_burst
= net
->sctp
.max_burst
;
4402 sp
->sctp_hmac_alg
= net
->sctp
.sctp_hmac_alg
;
4404 /* Initialize default setup parameters. These parameters
4405 * can be modified with the SCTP_INITMSG socket option or
4406 * overridden by the SCTP_INIT CMSG.
4408 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
4409 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
4410 sp
->initmsg
.sinit_max_attempts
= net
->sctp
.max_retrans_init
;
4411 sp
->initmsg
.sinit_max_init_timeo
= net
->sctp
.rto_max
;
4413 /* Initialize default RTO related parameters. These parameters can
4414 * be modified for with the SCTP_RTOINFO socket option.
4416 sp
->rtoinfo
.srto_initial
= net
->sctp
.rto_initial
;
4417 sp
->rtoinfo
.srto_max
= net
->sctp
.rto_max
;
4418 sp
->rtoinfo
.srto_min
= net
->sctp
.rto_min
;
4420 /* Initialize default association related parameters. These parameters
4421 * can be modified with the SCTP_ASSOCINFO socket option.
4423 sp
->assocparams
.sasoc_asocmaxrxt
= net
->sctp
.max_retrans_association
;
4424 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
4425 sp
->assocparams
.sasoc_peer_rwnd
= 0;
4426 sp
->assocparams
.sasoc_local_rwnd
= 0;
4427 sp
->assocparams
.sasoc_cookie_life
= net
->sctp
.valid_cookie_life
;
4429 /* Initialize default event subscriptions. By default, all the
4432 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
4434 /* Default Peer Address Parameters. These defaults can
4435 * be modified via SCTP_PEER_ADDR_PARAMS
4437 sp
->hbinterval
= net
->sctp
.hb_interval
;
4438 sp
->pathmaxrxt
= net
->sctp
.max_retrans_path
;
4439 sp
->pathmtu
= 0; /* allow default discovery */
4440 sp
->sackdelay
= net
->sctp
.sack_timeout
;
4442 sp
->param_flags
= SPP_HB_ENABLE
|
4444 SPP_SACKDELAY_ENABLE
;
4446 /* If enabled no SCTP message fragmentation will be performed.
4447 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4449 sp
->disable_fragments
= 0;
4451 /* Enable Nagle algorithm by default. */
4454 sp
->recvrcvinfo
= 0;
4455 sp
->recvnxtinfo
= 0;
4457 /* Enable by default. */
4460 /* Auto-close idle associations after the configured
4461 * number of seconds. A value of 0 disables this
4462 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4463 * for UDP-style sockets only.
4467 /* User specified fragmentation limit. */
4470 sp
->adaptation_ind
= 0;
4472 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
4474 /* Control variables for partial data delivery. */
4475 atomic_set(&sp
->pd_mode
, 0);
4476 skb_queue_head_init(&sp
->pd_lobby
);
4477 sp
->frag_interleave
= 0;
4479 /* Create a per socket endpoint structure. Even if we
4480 * change the data structure relationships, this may still
4481 * be useful for storing pre-connect address information.
4483 sp
->ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
4489 sk
->sk_destruct
= sctp_destruct_sock
;
4491 SCTP_DBG_OBJCNT_INC(sock
);
4494 sk_sockets_allocated_inc(sk
);
4495 sock_prot_inuse_add(net
, sk
->sk_prot
, 1);
4497 /* Nothing can fail after this block, otherwise
4498 * sctp_destroy_sock() will be called without addr_wq_lock held
4500 if (net
->sctp
.default_auto_asconf
) {
4501 spin_lock(&sock_net(sk
)->sctp
.addr_wq_lock
);
4502 list_add_tail(&sp
->auto_asconf_list
,
4503 &net
->sctp
.auto_asconf_splist
);
4504 sp
->do_auto_asconf
= 1;
4505 spin_unlock(&sock_net(sk
)->sctp
.addr_wq_lock
);
4507 sp
->do_auto_asconf
= 0;
4515 /* Cleanup any SCTP per socket resources. Must be called with
4516 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4518 static void sctp_destroy_sock(struct sock
*sk
)
4520 struct sctp_sock
*sp
;
4522 pr_debug("%s: sk:%p\n", __func__
, sk
);
4524 /* Release our hold on the endpoint. */
4526 /* This could happen during socket init, thus we bail out
4527 * early, since the rest of the below is not setup either.
4532 if (sp
->do_auto_asconf
) {
4533 sp
->do_auto_asconf
= 0;
4534 list_del(&sp
->auto_asconf_list
);
4536 sctp_endpoint_free(sp
->ep
);
4538 sk_sockets_allocated_dec(sk
);
4539 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
4543 /* Triggered when there are no references on the socket anymore */
4544 static void sctp_destruct_sock(struct sock
*sk
)
4546 struct sctp_sock
*sp
= sctp_sk(sk
);
4548 /* Free up the HMAC transform. */
4549 crypto_free_shash(sp
->hmac
);
4551 inet_sock_destruct(sk
);
4554 /* API 4.1.7 shutdown() - TCP Style Syntax
4555 * int shutdown(int socket, int how);
4557 * sd - the socket descriptor of the association to be closed.
4558 * how - Specifies the type of shutdown. The values are
4561 * Disables further receive operations. No SCTP
4562 * protocol action is taken.
4564 * Disables further send operations, and initiates
4565 * the SCTP shutdown sequence.
4567 * Disables further send and receive operations
4568 * and initiates the SCTP shutdown sequence.
4570 static void sctp_shutdown(struct sock
*sk
, int how
)
4572 struct net
*net
= sock_net(sk
);
4573 struct sctp_endpoint
*ep
;
4575 if (!sctp_style(sk
, TCP
))
4578 ep
= sctp_sk(sk
)->ep
;
4579 if (how
& SEND_SHUTDOWN
&& !list_empty(&ep
->asocs
)) {
4580 struct sctp_association
*asoc
;
4582 sk
->sk_state
= SCTP_SS_CLOSING
;
4583 asoc
= list_entry(ep
->asocs
.next
,
4584 struct sctp_association
, asocs
);
4585 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
4589 int sctp_get_sctp_info(struct sock
*sk
, struct sctp_association
*asoc
,
4590 struct sctp_info
*info
)
4592 struct sctp_transport
*prim
;
4593 struct list_head
*pos
;
4596 memset(info
, 0, sizeof(*info
));
4598 struct sctp_sock
*sp
= sctp_sk(sk
);
4600 info
->sctpi_s_autoclose
= sp
->autoclose
;
4601 info
->sctpi_s_adaptation_ind
= sp
->adaptation_ind
;
4602 info
->sctpi_s_pd_point
= sp
->pd_point
;
4603 info
->sctpi_s_nodelay
= sp
->nodelay
;
4604 info
->sctpi_s_disable_fragments
= sp
->disable_fragments
;
4605 info
->sctpi_s_v4mapped
= sp
->v4mapped
;
4606 info
->sctpi_s_frag_interleave
= sp
->frag_interleave
;
4607 info
->sctpi_s_type
= sp
->type
;
4612 info
->sctpi_tag
= asoc
->c
.my_vtag
;
4613 info
->sctpi_state
= asoc
->state
;
4614 info
->sctpi_rwnd
= asoc
->a_rwnd
;
4615 info
->sctpi_unackdata
= asoc
->unack_data
;
4616 info
->sctpi_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4617 info
->sctpi_instrms
= asoc
->stream
.incnt
;
4618 info
->sctpi_outstrms
= asoc
->stream
.outcnt
;
4619 list_for_each(pos
, &asoc
->base
.inqueue
.in_chunk_list
)
4620 info
->sctpi_inqueue
++;
4621 list_for_each(pos
, &asoc
->outqueue
.out_chunk_list
)
4622 info
->sctpi_outqueue
++;
4623 info
->sctpi_overall_error
= asoc
->overall_error_count
;
4624 info
->sctpi_max_burst
= asoc
->max_burst
;
4625 info
->sctpi_maxseg
= asoc
->frag_point
;
4626 info
->sctpi_peer_rwnd
= asoc
->peer
.rwnd
;
4627 info
->sctpi_peer_tag
= asoc
->c
.peer_vtag
;
4629 mask
= asoc
->peer
.ecn_capable
<< 1;
4630 mask
= (mask
| asoc
->peer
.ipv4_address
) << 1;
4631 mask
= (mask
| asoc
->peer
.ipv6_address
) << 1;
4632 mask
= (mask
| asoc
->peer
.hostname_address
) << 1;
4633 mask
= (mask
| asoc
->peer
.asconf_capable
) << 1;
4634 mask
= (mask
| asoc
->peer
.prsctp_capable
) << 1;
4635 mask
= (mask
| asoc
->peer
.auth_capable
);
4636 info
->sctpi_peer_capable
= mask
;
4637 mask
= asoc
->peer
.sack_needed
<< 1;
4638 mask
= (mask
| asoc
->peer
.sack_generation
) << 1;
4639 mask
= (mask
| asoc
->peer
.zero_window_announced
);
4640 info
->sctpi_peer_sack
= mask
;
4642 info
->sctpi_isacks
= asoc
->stats
.isacks
;
4643 info
->sctpi_osacks
= asoc
->stats
.osacks
;
4644 info
->sctpi_opackets
= asoc
->stats
.opackets
;
4645 info
->sctpi_ipackets
= asoc
->stats
.ipackets
;
4646 info
->sctpi_rtxchunks
= asoc
->stats
.rtxchunks
;
4647 info
->sctpi_outofseqtsns
= asoc
->stats
.outofseqtsns
;
4648 info
->sctpi_idupchunks
= asoc
->stats
.idupchunks
;
4649 info
->sctpi_gapcnt
= asoc
->stats
.gapcnt
;
4650 info
->sctpi_ouodchunks
= asoc
->stats
.ouodchunks
;
4651 info
->sctpi_iuodchunks
= asoc
->stats
.iuodchunks
;
4652 info
->sctpi_oodchunks
= asoc
->stats
.oodchunks
;
4653 info
->sctpi_iodchunks
= asoc
->stats
.iodchunks
;
4654 info
->sctpi_octrlchunks
= asoc
->stats
.octrlchunks
;
4655 info
->sctpi_ictrlchunks
= asoc
->stats
.ictrlchunks
;
4657 prim
= asoc
->peer
.primary_path
;
4658 memcpy(&info
->sctpi_p_address
, &prim
->ipaddr
, sizeof(prim
->ipaddr
));
4659 info
->sctpi_p_state
= prim
->state
;
4660 info
->sctpi_p_cwnd
= prim
->cwnd
;
4661 info
->sctpi_p_srtt
= prim
->srtt
;
4662 info
->sctpi_p_rto
= jiffies_to_msecs(prim
->rto
);
4663 info
->sctpi_p_hbinterval
= prim
->hbinterval
;
4664 info
->sctpi_p_pathmaxrxt
= prim
->pathmaxrxt
;
4665 info
->sctpi_p_sackdelay
= jiffies_to_msecs(prim
->sackdelay
);
4666 info
->sctpi_p_ssthresh
= prim
->ssthresh
;
4667 info
->sctpi_p_partial_bytes_acked
= prim
->partial_bytes_acked
;
4668 info
->sctpi_p_flight_size
= prim
->flight_size
;
4669 info
->sctpi_p_error
= prim
->error_count
;
4673 EXPORT_SYMBOL_GPL(sctp_get_sctp_info
);
4675 /* use callback to avoid exporting the core structure */
4676 int sctp_transport_walk_start(struct rhashtable_iter
*iter
)
4680 rhltable_walk_enter(&sctp_transport_hashtable
, iter
);
4682 err
= rhashtable_walk_start(iter
);
4683 if (err
&& err
!= -EAGAIN
) {
4684 rhashtable_walk_stop(iter
);
4685 rhashtable_walk_exit(iter
);
4692 void sctp_transport_walk_stop(struct rhashtable_iter
*iter
)
4694 rhashtable_walk_stop(iter
);
4695 rhashtable_walk_exit(iter
);
4698 struct sctp_transport
*sctp_transport_get_next(struct net
*net
,
4699 struct rhashtable_iter
*iter
)
4701 struct sctp_transport
*t
;
4703 t
= rhashtable_walk_next(iter
);
4704 for (; t
; t
= rhashtable_walk_next(iter
)) {
4706 if (PTR_ERR(t
) == -EAGAIN
)
4711 if (!sctp_transport_hold(t
))
4714 if (net_eq(sock_net(t
->asoc
->base
.sk
), net
) &&
4715 t
->asoc
->peer
.primary_path
== t
)
4718 sctp_transport_put(t
);
4724 struct sctp_transport
*sctp_transport_get_idx(struct net
*net
,
4725 struct rhashtable_iter
*iter
,
4728 struct sctp_transport
*t
;
4731 return SEQ_START_TOKEN
;
4733 while ((t
= sctp_transport_get_next(net
, iter
)) && !IS_ERR(t
)) {
4736 sctp_transport_put(t
);
4742 int sctp_for_each_endpoint(int (*cb
)(struct sctp_endpoint
*, void *),
4746 struct sctp_ep_common
*epb
;
4747 struct sctp_hashbucket
*head
;
4749 for (head
= sctp_ep_hashtable
; hash
< sctp_ep_hashsize
;
4751 read_lock_bh(&head
->lock
);
4752 sctp_for_each_hentry(epb
, &head
->chain
) {
4753 err
= cb(sctp_ep(epb
), p
);
4757 read_unlock_bh(&head
->lock
);
4762 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint
);
4764 int sctp_transport_lookup_process(int (*cb
)(struct sctp_transport
*, void *),
4766 const union sctp_addr
*laddr
,
4767 const union sctp_addr
*paddr
, void *p
)
4769 struct sctp_transport
*transport
;
4773 transport
= sctp_addrs_lookup_transport(net
, laddr
, paddr
);
4778 err
= cb(transport
, p
);
4779 sctp_transport_put(transport
);
4783 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process
);
4785 int sctp_for_each_transport(int (*cb
)(struct sctp_transport
*, void *),
4786 int (*cb_done
)(struct sctp_transport
*, void *),
4787 struct net
*net
, int *pos
, void *p
) {
4788 struct rhashtable_iter hti
;
4789 struct sctp_transport
*tsp
;
4793 ret
= sctp_transport_walk_start(&hti
);
4797 tsp
= sctp_transport_get_idx(net
, &hti
, *pos
+ 1);
4798 for (; !IS_ERR_OR_NULL(tsp
); tsp
= sctp_transport_get_next(net
, &hti
)) {
4803 sctp_transport_put(tsp
);
4805 sctp_transport_walk_stop(&hti
);
4808 if (cb_done
&& !cb_done(tsp
, p
)) {
4810 sctp_transport_put(tsp
);
4813 sctp_transport_put(tsp
);
4818 EXPORT_SYMBOL_GPL(sctp_for_each_transport
);
4820 /* 7.2.1 Association Status (SCTP_STATUS)
4822 * Applications can retrieve current status information about an
4823 * association, including association state, peer receiver window size,
4824 * number of unacked data chunks, and number of data chunks pending
4825 * receipt. This information is read-only.
4827 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
4828 char __user
*optval
,
4831 struct sctp_status status
;
4832 struct sctp_association
*asoc
= NULL
;
4833 struct sctp_transport
*transport
;
4834 sctp_assoc_t associd
;
4837 if (len
< sizeof(status
)) {
4842 len
= sizeof(status
);
4843 if (copy_from_user(&status
, optval
, len
)) {
4848 associd
= status
.sstat_assoc_id
;
4849 asoc
= sctp_id2assoc(sk
, associd
);
4855 transport
= asoc
->peer
.primary_path
;
4857 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
4858 status
.sstat_state
= sctp_assoc_to_state(asoc
);
4859 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
4860 status
.sstat_unackdata
= asoc
->unack_data
;
4862 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4863 status
.sstat_instrms
= asoc
->stream
.incnt
;
4864 status
.sstat_outstrms
= asoc
->stream
.outcnt
;
4865 status
.sstat_fragmentation_point
= asoc
->frag_point
;
4866 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4867 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
4868 transport
->af_specific
->sockaddr_len
);
4869 /* Map ipv4 address into v4-mapped-on-v6 address. */
4870 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sctp_sk(sk
),
4871 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
4872 status
.sstat_primary
.spinfo_state
= transport
->state
;
4873 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
4874 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
4875 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4876 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
4878 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
4879 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
4881 if (put_user(len
, optlen
)) {
4886 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4887 __func__
, len
, status
.sstat_state
, status
.sstat_rwnd
,
4888 status
.sstat_assoc_id
);
4890 if (copy_to_user(optval
, &status
, len
)) {
4900 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4902 * Applications can retrieve information about a specific peer address
4903 * of an association, including its reachability state, congestion
4904 * window, and retransmission timer values. This information is
4907 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
4908 char __user
*optval
,
4911 struct sctp_paddrinfo pinfo
;
4912 struct sctp_transport
*transport
;
4915 if (len
< sizeof(pinfo
)) {
4920 len
= sizeof(pinfo
);
4921 if (copy_from_user(&pinfo
, optval
, len
)) {
4926 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
4927 pinfo
.spinfo_assoc_id
);
4931 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4932 pinfo
.spinfo_state
= transport
->state
;
4933 pinfo
.spinfo_cwnd
= transport
->cwnd
;
4934 pinfo
.spinfo_srtt
= transport
->srtt
;
4935 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4936 pinfo
.spinfo_mtu
= transport
->pathmtu
;
4938 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
4939 pinfo
.spinfo_state
= SCTP_ACTIVE
;
4941 if (put_user(len
, optlen
)) {
4946 if (copy_to_user(optval
, &pinfo
, len
)) {
4955 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4957 * This option is a on/off flag. If enabled no SCTP message
4958 * fragmentation will be performed. Instead if a message being sent
4959 * exceeds the current PMTU size, the message will NOT be sent and
4960 * instead a error will be indicated to the user.
4962 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
4963 char __user
*optval
, int __user
*optlen
)
4967 if (len
< sizeof(int))
4971 val
= (sctp_sk(sk
)->disable_fragments
== 1);
4972 if (put_user(len
, optlen
))
4974 if (copy_to_user(optval
, &val
, len
))
4979 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4981 * This socket option is used to specify various notifications and
4982 * ancillary data the user wishes to receive.
4984 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
4989 if (len
> sizeof(struct sctp_event_subscribe
))
4990 len
= sizeof(struct sctp_event_subscribe
);
4991 if (put_user(len
, optlen
))
4993 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
4998 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5000 * This socket option is applicable to the UDP-style socket only. When
5001 * set it will cause associations that are idle for more than the
5002 * specified number of seconds to automatically close. An association
5003 * being idle is defined an association that has NOT sent or received
5004 * user data. The special value of '0' indicates that no automatic
5005 * close of any associations should be performed. The option expects an
5006 * integer defining the number of seconds of idle time before an
5007 * association is closed.
5009 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
5011 /* Applicable to UDP-style socket only */
5012 if (sctp_style(sk
, TCP
))
5014 if (len
< sizeof(int))
5017 if (put_user(len
, optlen
))
5019 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, len
))
5024 /* Helper routine to branch off an association to a new socket. */
5025 int sctp_do_peeloff(struct sock
*sk
, sctp_assoc_t id
, struct socket
**sockp
)
5027 struct sctp_association
*asoc
= sctp_id2assoc(sk
, id
);
5028 struct sctp_sock
*sp
= sctp_sk(sk
);
5029 struct socket
*sock
;
5032 /* Do not peel off from one netns to another one. */
5033 if (!net_eq(current
->nsproxy
->net_ns
, sock_net(sk
)))
5039 /* An association cannot be branched off from an already peeled-off
5040 * socket, nor is this supported for tcp style sockets.
5042 if (!sctp_style(sk
, UDP
))
5045 /* Create a new socket. */
5046 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
5050 sctp_copy_sock(sock
->sk
, sk
, asoc
);
5052 /* Make peeled-off sockets more like 1-1 accepted sockets.
5053 * Set the daddr and initialize id to something more random
5055 sp
->pf
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
5057 /* Populate the fields of the newsk from the oldsk and migrate the
5058 * asoc to the newsk.
5060 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
5066 EXPORT_SYMBOL(sctp_do_peeloff
);
5068 static int sctp_getsockopt_peeloff_common(struct sock
*sk
, sctp_peeloff_arg_t
*peeloff
,
5069 struct file
**newfile
, unsigned flags
)
5071 struct socket
*newsock
;
5074 retval
= sctp_do_peeloff(sk
, peeloff
->associd
, &newsock
);
5078 /* Map the socket to an unused fd that can be returned to the user. */
5079 retval
= get_unused_fd_flags(flags
& SOCK_CLOEXEC
);
5081 sock_release(newsock
);
5085 *newfile
= sock_alloc_file(newsock
, 0, NULL
);
5086 if (IS_ERR(*newfile
)) {
5087 put_unused_fd(retval
);
5088 retval
= PTR_ERR(*newfile
);
5093 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__
, sk
, newsock
->sk
,
5096 peeloff
->sd
= retval
;
5098 if (flags
& SOCK_NONBLOCK
)
5099 (*newfile
)->f_flags
|= O_NONBLOCK
;
5104 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
5106 sctp_peeloff_arg_t peeloff
;
5107 struct file
*newfile
= NULL
;
5110 if (len
< sizeof(sctp_peeloff_arg_t
))
5112 len
= sizeof(sctp_peeloff_arg_t
);
5113 if (copy_from_user(&peeloff
, optval
, len
))
5116 retval
= sctp_getsockopt_peeloff_common(sk
, &peeloff
, &newfile
, 0);
5120 /* Return the fd mapped to the new socket. */
5121 if (put_user(len
, optlen
)) {
5123 put_unused_fd(retval
);
5127 if (copy_to_user(optval
, &peeloff
, len
)) {
5129 put_unused_fd(retval
);
5132 fd_install(retval
, newfile
);
5137 static int sctp_getsockopt_peeloff_flags(struct sock
*sk
, int len
,
5138 char __user
*optval
, int __user
*optlen
)
5140 sctp_peeloff_flags_arg_t peeloff
;
5141 struct file
*newfile
= NULL
;
5144 if (len
< sizeof(sctp_peeloff_flags_arg_t
))
5146 len
= sizeof(sctp_peeloff_flags_arg_t
);
5147 if (copy_from_user(&peeloff
, optval
, len
))
5150 retval
= sctp_getsockopt_peeloff_common(sk
, &peeloff
.p_arg
,
5151 &newfile
, peeloff
.flags
);
5155 /* Return the fd mapped to the new socket. */
5156 if (put_user(len
, optlen
)) {
5158 put_unused_fd(retval
);
5162 if (copy_to_user(optval
, &peeloff
, len
)) {
5164 put_unused_fd(retval
);
5167 fd_install(retval
, newfile
);
5172 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5174 * Applications can enable or disable heartbeats for any peer address of
5175 * an association, modify an address's heartbeat interval, force a
5176 * heartbeat to be sent immediately, and adjust the address's maximum
5177 * number of retransmissions sent before an address is considered
5178 * unreachable. The following structure is used to access and modify an
5179 * address's parameters:
5181 * struct sctp_paddrparams {
5182 * sctp_assoc_t spp_assoc_id;
5183 * struct sockaddr_storage spp_address;
5184 * uint32_t spp_hbinterval;
5185 * uint16_t spp_pathmaxrxt;
5186 * uint32_t spp_pathmtu;
5187 * uint32_t spp_sackdelay;
5188 * uint32_t spp_flags;
5191 * spp_assoc_id - (one-to-many style socket) This is filled in the
5192 * application, and identifies the association for
5194 * spp_address - This specifies which address is of interest.
5195 * spp_hbinterval - This contains the value of the heartbeat interval,
5196 * in milliseconds. If a value of zero
5197 * is present in this field then no changes are to
5198 * be made to this parameter.
5199 * spp_pathmaxrxt - This contains the maximum number of
5200 * retransmissions before this address shall be
5201 * considered unreachable. If a value of zero
5202 * is present in this field then no changes are to
5203 * be made to this parameter.
5204 * spp_pathmtu - When Path MTU discovery is disabled the value
5205 * specified here will be the "fixed" path mtu.
5206 * Note that if the spp_address field is empty
5207 * then all associations on this address will
5208 * have this fixed path mtu set upon them.
5210 * spp_sackdelay - When delayed sack is enabled, this value specifies
5211 * the number of milliseconds that sacks will be delayed
5212 * for. This value will apply to all addresses of an
5213 * association if the spp_address field is empty. Note
5214 * also, that if delayed sack is enabled and this
5215 * value is set to 0, no change is made to the last
5216 * recorded delayed sack timer value.
5218 * spp_flags - These flags are used to control various features
5219 * on an association. The flag field may contain
5220 * zero or more of the following options.
5222 * SPP_HB_ENABLE - Enable heartbeats on the
5223 * specified address. Note that if the address
5224 * field is empty all addresses for the association
5225 * have heartbeats enabled upon them.
5227 * SPP_HB_DISABLE - Disable heartbeats on the
5228 * speicifed address. Note that if the address
5229 * field is empty all addresses for the association
5230 * will have their heartbeats disabled. Note also
5231 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5232 * mutually exclusive, only one of these two should
5233 * be specified. Enabling both fields will have
5234 * undetermined results.
5236 * SPP_HB_DEMAND - Request a user initiated heartbeat
5237 * to be made immediately.
5239 * SPP_PMTUD_ENABLE - This field will enable PMTU
5240 * discovery upon the specified address. Note that
5241 * if the address feild is empty then all addresses
5242 * on the association are effected.
5244 * SPP_PMTUD_DISABLE - This field will disable PMTU
5245 * discovery upon the specified address. Note that
5246 * if the address feild is empty then all addresses
5247 * on the association are effected. Not also that
5248 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5249 * exclusive. Enabling both will have undetermined
5252 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5253 * on delayed sack. The time specified in spp_sackdelay
5254 * is used to specify the sack delay for this address. Note
5255 * that if spp_address is empty then all addresses will
5256 * enable delayed sack and take on the sack delay
5257 * value specified in spp_sackdelay.
5258 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5259 * off delayed sack. If the spp_address field is blank then
5260 * delayed sack is disabled for the entire association. Note
5261 * also that this field is mutually exclusive to
5262 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5265 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
5266 char __user
*optval
, int __user
*optlen
)
5268 struct sctp_paddrparams params
;
5269 struct sctp_transport
*trans
= NULL
;
5270 struct sctp_association
*asoc
= NULL
;
5271 struct sctp_sock
*sp
= sctp_sk(sk
);
5273 if (len
< sizeof(struct sctp_paddrparams
))
5275 len
= sizeof(struct sctp_paddrparams
);
5276 if (copy_from_user(¶ms
, optval
, len
))
5279 /* If an address other than INADDR_ANY is specified, and
5280 * no transport is found, then the request is invalid.
5282 if (!sctp_is_any(sk
, (union sctp_addr
*)¶ms
.spp_address
)) {
5283 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
5284 params
.spp_assoc_id
);
5286 pr_debug("%s: failed no transport\n", __func__
);
5291 /* Get association, if assoc_id != 0 and the socket is a one
5292 * to many style socket, and an association was not found, then
5293 * the id was invalid.
5295 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
5296 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
5297 pr_debug("%s: failed no association\n", __func__
);
5302 /* Fetch transport values. */
5303 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
5304 params
.spp_pathmtu
= trans
->pathmtu
;
5305 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
5306 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
5308 /*draft-11 doesn't say what to return in spp_flags*/
5309 params
.spp_flags
= trans
->param_flags
;
5311 /* Fetch association values. */
5312 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
5313 params
.spp_pathmtu
= asoc
->pathmtu
;
5314 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
5315 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
5317 /*draft-11 doesn't say what to return in spp_flags*/
5318 params
.spp_flags
= asoc
->param_flags
;
5320 /* Fetch socket values. */
5321 params
.spp_hbinterval
= sp
->hbinterval
;
5322 params
.spp_pathmtu
= sp
->pathmtu
;
5323 params
.spp_sackdelay
= sp
->sackdelay
;
5324 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
5326 /*draft-11 doesn't say what to return in spp_flags*/
5327 params
.spp_flags
= sp
->param_flags
;
5330 if (copy_to_user(optval
, ¶ms
, len
))
5333 if (put_user(len
, optlen
))
5340 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5342 * This option will effect the way delayed acks are performed. This
5343 * option allows you to get or set the delayed ack time, in
5344 * milliseconds. It also allows changing the delayed ack frequency.
5345 * Changing the frequency to 1 disables the delayed sack algorithm. If
5346 * the assoc_id is 0, then this sets or gets the endpoints default
5347 * values. If the assoc_id field is non-zero, then the set or get
5348 * effects the specified association for the one to many model (the
5349 * assoc_id field is ignored by the one to one model). Note that if
5350 * sack_delay or sack_freq are 0 when setting this option, then the
5351 * current values will remain unchanged.
5353 * struct sctp_sack_info {
5354 * sctp_assoc_t sack_assoc_id;
5355 * uint32_t sack_delay;
5356 * uint32_t sack_freq;
5359 * sack_assoc_id - This parameter, indicates which association the user
5360 * is performing an action upon. Note that if this field's value is
5361 * zero then the endpoints default value is changed (effecting future
5362 * associations only).
5364 * sack_delay - This parameter contains the number of milliseconds that
5365 * the user is requesting the delayed ACK timer be set to. Note that
5366 * this value is defined in the standard to be between 200 and 500
5369 * sack_freq - This parameter contains the number of packets that must
5370 * be received before a sack is sent without waiting for the delay
5371 * timer to expire. The default value for this is 2, setting this
5372 * value to 1 will disable the delayed sack algorithm.
5374 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
5375 char __user
*optval
,
5378 struct sctp_sack_info params
;
5379 struct sctp_association
*asoc
= NULL
;
5380 struct sctp_sock
*sp
= sctp_sk(sk
);
5382 if (len
>= sizeof(struct sctp_sack_info
)) {
5383 len
= sizeof(struct sctp_sack_info
);
5385 if (copy_from_user(¶ms
, optval
, len
))
5387 } else if (len
== sizeof(struct sctp_assoc_value
)) {
5388 pr_warn_ratelimited(DEPRECATED
5390 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5391 "Use struct sctp_sack_info instead\n",
5392 current
->comm
, task_pid_nr(current
));
5393 if (copy_from_user(¶ms
, optval
, len
))
5398 /* Get association, if sack_assoc_id != 0 and the socket is a one
5399 * to many style socket, and an association was not found, then
5400 * the id was invalid.
5402 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
5403 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
5407 /* Fetch association values. */
5408 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
5409 params
.sack_delay
= jiffies_to_msecs(
5411 params
.sack_freq
= asoc
->sackfreq
;
5414 params
.sack_delay
= 0;
5415 params
.sack_freq
= 1;
5418 /* Fetch socket values. */
5419 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
5420 params
.sack_delay
= sp
->sackdelay
;
5421 params
.sack_freq
= sp
->sackfreq
;
5423 params
.sack_delay
= 0;
5424 params
.sack_freq
= 1;
5428 if (copy_to_user(optval
, ¶ms
, len
))
5431 if (put_user(len
, optlen
))
5437 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5439 * Applications can specify protocol parameters for the default association
5440 * initialization. The option name argument to setsockopt() and getsockopt()
5443 * Setting initialization parameters is effective only on an unconnected
5444 * socket (for UDP-style sockets only future associations are effected
5445 * by the change). With TCP-style sockets, this option is inherited by
5446 * sockets derived from a listener socket.
5448 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
5450 if (len
< sizeof(struct sctp_initmsg
))
5452 len
= sizeof(struct sctp_initmsg
);
5453 if (put_user(len
, optlen
))
5455 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
5461 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
5462 char __user
*optval
, int __user
*optlen
)
5464 struct sctp_association
*asoc
;
5466 struct sctp_getaddrs getaddrs
;
5467 struct sctp_transport
*from
;
5469 union sctp_addr temp
;
5470 struct sctp_sock
*sp
= sctp_sk(sk
);
5475 if (len
< sizeof(struct sctp_getaddrs
))
5478 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
5481 /* For UDP-style sockets, id specifies the association to query. */
5482 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
5486 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
5487 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
5489 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
5491 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
5492 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5493 ->addr_to_user(sp
, &temp
);
5494 if (space_left
< addrlen
)
5496 if (copy_to_user(to
, &temp
, addrlen
))
5500 space_left
-= addrlen
;
5503 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
5505 bytes_copied
= ((char __user
*)to
) - optval
;
5506 if (put_user(bytes_copied
, optlen
))
5512 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
5513 size_t space_left
, int *bytes_copied
)
5515 struct sctp_sockaddr_entry
*addr
;
5516 union sctp_addr temp
;
5519 struct net
*net
= sock_net(sk
);
5522 list_for_each_entry_rcu(addr
, &net
->sctp
.local_addr_list
, list
) {
5526 if ((PF_INET
== sk
->sk_family
) &&
5527 (AF_INET6
== addr
->a
.sa
.sa_family
))
5529 if ((PF_INET6
== sk
->sk_family
) &&
5530 inet_v6_ipv6only(sk
) &&
5531 (AF_INET
== addr
->a
.sa
.sa_family
))
5533 memcpy(&temp
, &addr
->a
, sizeof(temp
));
5534 if (!temp
.v4
.sin_port
)
5535 temp
.v4
.sin_port
= htons(port
);
5537 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5538 ->addr_to_user(sctp_sk(sk
), &temp
);
5540 if (space_left
< addrlen
) {
5544 memcpy(to
, &temp
, addrlen
);
5548 space_left
-= addrlen
;
5549 *bytes_copied
+= addrlen
;
5557 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
5558 char __user
*optval
, int __user
*optlen
)
5560 struct sctp_bind_addr
*bp
;
5561 struct sctp_association
*asoc
;
5563 struct sctp_getaddrs getaddrs
;
5564 struct sctp_sockaddr_entry
*addr
;
5566 union sctp_addr temp
;
5567 struct sctp_sock
*sp
= sctp_sk(sk
);
5571 int bytes_copied
= 0;
5575 if (len
< sizeof(struct sctp_getaddrs
))
5578 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
5582 * For UDP-style sockets, id specifies the association to query.
5583 * If the id field is set to the value '0' then the locally bound
5584 * addresses are returned without regard to any particular
5587 if (0 == getaddrs
.assoc_id
) {
5588 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
5590 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
5593 bp
= &asoc
->base
.bind_addr
;
5596 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
5597 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
5599 addrs
= kmalloc(space_left
, GFP_USER
| __GFP_NOWARN
);
5603 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5604 * addresses from the global local address list.
5606 if (sctp_list_single_entry(&bp
->address_list
)) {
5607 addr
= list_entry(bp
->address_list
.next
,
5608 struct sctp_sockaddr_entry
, list
);
5609 if (sctp_is_any(sk
, &addr
->a
)) {
5610 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
5611 space_left
, &bytes_copied
);
5621 /* Protection on the bound address list is not needed since
5622 * in the socket option context we hold a socket lock and
5623 * thus the bound address list can't change.
5625 list_for_each_entry(addr
, &bp
->address_list
, list
) {
5626 memcpy(&temp
, &addr
->a
, sizeof(temp
));
5627 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5628 ->addr_to_user(sp
, &temp
);
5629 if (space_left
< addrlen
) {
5630 err
= -ENOMEM
; /*fixme: right error?*/
5633 memcpy(buf
, &temp
, addrlen
);
5635 bytes_copied
+= addrlen
;
5637 space_left
-= addrlen
;
5641 if (copy_to_user(to
, addrs
, bytes_copied
)) {
5645 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
5649 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
5650 * but we can't change it anymore.
5652 if (put_user(bytes_copied
, optlen
))
5659 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5661 * Requests that the local SCTP stack use the enclosed peer address as
5662 * the association primary. The enclosed address must be one of the
5663 * association peer's addresses.
5665 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
5666 char __user
*optval
, int __user
*optlen
)
5668 struct sctp_prim prim
;
5669 struct sctp_association
*asoc
;
5670 struct sctp_sock
*sp
= sctp_sk(sk
);
5672 if (len
< sizeof(struct sctp_prim
))
5675 len
= sizeof(struct sctp_prim
);
5677 if (copy_from_user(&prim
, optval
, len
))
5680 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
5684 if (!asoc
->peer
.primary_path
)
5687 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
5688 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
5690 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sp
,
5691 (union sctp_addr
*)&prim
.ssp_addr
);
5693 if (put_user(len
, optlen
))
5695 if (copy_to_user(optval
, &prim
, len
))
5702 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5704 * Requests that the local endpoint set the specified Adaptation Layer
5705 * Indication parameter for all future INIT and INIT-ACK exchanges.
5707 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
5708 char __user
*optval
, int __user
*optlen
)
5710 struct sctp_setadaptation adaptation
;
5712 if (len
< sizeof(struct sctp_setadaptation
))
5715 len
= sizeof(struct sctp_setadaptation
);
5717 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
5719 if (put_user(len
, optlen
))
5721 if (copy_to_user(optval
, &adaptation
, len
))
5729 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5731 * Applications that wish to use the sendto() system call may wish to
5732 * specify a default set of parameters that would normally be supplied
5733 * through the inclusion of ancillary data. This socket option allows
5734 * such an application to set the default sctp_sndrcvinfo structure.
5737 * The application that wishes to use this socket option simply passes
5738 * in to this call the sctp_sndrcvinfo structure defined in Section
5739 * 5.2.2) The input parameters accepted by this call include
5740 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5741 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5742 * to this call if the caller is using the UDP model.
5744 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5746 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
5747 int len
, char __user
*optval
,
5750 struct sctp_sock
*sp
= sctp_sk(sk
);
5751 struct sctp_association
*asoc
;
5752 struct sctp_sndrcvinfo info
;
5754 if (len
< sizeof(info
))
5759 if (copy_from_user(&info
, optval
, len
))
5762 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
5763 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
5766 info
.sinfo_stream
= asoc
->default_stream
;
5767 info
.sinfo_flags
= asoc
->default_flags
;
5768 info
.sinfo_ppid
= asoc
->default_ppid
;
5769 info
.sinfo_context
= asoc
->default_context
;
5770 info
.sinfo_timetolive
= asoc
->default_timetolive
;
5772 info
.sinfo_stream
= sp
->default_stream
;
5773 info
.sinfo_flags
= sp
->default_flags
;
5774 info
.sinfo_ppid
= sp
->default_ppid
;
5775 info
.sinfo_context
= sp
->default_context
;
5776 info
.sinfo_timetolive
= sp
->default_timetolive
;
5779 if (put_user(len
, optlen
))
5781 if (copy_to_user(optval
, &info
, len
))
5787 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5788 * (SCTP_DEFAULT_SNDINFO)
5790 static int sctp_getsockopt_default_sndinfo(struct sock
*sk
, int len
,
5791 char __user
*optval
,
5794 struct sctp_sock
*sp
= sctp_sk(sk
);
5795 struct sctp_association
*asoc
;
5796 struct sctp_sndinfo info
;
5798 if (len
< sizeof(info
))
5803 if (copy_from_user(&info
, optval
, len
))
5806 asoc
= sctp_id2assoc(sk
, info
.snd_assoc_id
);
5807 if (!asoc
&& info
.snd_assoc_id
&& sctp_style(sk
, UDP
))
5810 info
.snd_sid
= asoc
->default_stream
;
5811 info
.snd_flags
= asoc
->default_flags
;
5812 info
.snd_ppid
= asoc
->default_ppid
;
5813 info
.snd_context
= asoc
->default_context
;
5815 info
.snd_sid
= sp
->default_stream
;
5816 info
.snd_flags
= sp
->default_flags
;
5817 info
.snd_ppid
= sp
->default_ppid
;
5818 info
.snd_context
= sp
->default_context
;
5821 if (put_user(len
, optlen
))
5823 if (copy_to_user(optval
, &info
, len
))
5831 * 7.1.5 SCTP_NODELAY
5833 * Turn on/off any Nagle-like algorithm. This means that packets are
5834 * generally sent as soon as possible and no unnecessary delays are
5835 * introduced, at the cost of more packets in the network. Expects an
5836 * integer boolean flag.
5839 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
5840 char __user
*optval
, int __user
*optlen
)
5844 if (len
< sizeof(int))
5848 val
= (sctp_sk(sk
)->nodelay
== 1);
5849 if (put_user(len
, optlen
))
5851 if (copy_to_user(optval
, &val
, len
))
5858 * 7.1.1 SCTP_RTOINFO
5860 * The protocol parameters used to initialize and bound retransmission
5861 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5862 * and modify these parameters.
5863 * All parameters are time values, in milliseconds. A value of 0, when
5864 * modifying the parameters, indicates that the current value should not
5868 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
5869 char __user
*optval
,
5870 int __user
*optlen
) {
5871 struct sctp_rtoinfo rtoinfo
;
5872 struct sctp_association
*asoc
;
5874 if (len
< sizeof (struct sctp_rtoinfo
))
5877 len
= sizeof(struct sctp_rtoinfo
);
5879 if (copy_from_user(&rtoinfo
, optval
, len
))
5882 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
5884 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
5887 /* Values corresponding to the specific association. */
5889 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
5890 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
5891 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
5893 /* Values corresponding to the endpoint. */
5894 struct sctp_sock
*sp
= sctp_sk(sk
);
5896 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
5897 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
5898 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
5901 if (put_user(len
, optlen
))
5904 if (copy_to_user(optval
, &rtoinfo
, len
))
5912 * 7.1.2 SCTP_ASSOCINFO
5914 * This option is used to tune the maximum retransmission attempts
5915 * of the association.
5916 * Returns an error if the new association retransmission value is
5917 * greater than the sum of the retransmission value of the peer.
5918 * See [SCTP] for more information.
5921 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
5922 char __user
*optval
,
5926 struct sctp_assocparams assocparams
;
5927 struct sctp_association
*asoc
;
5928 struct list_head
*pos
;
5931 if (len
< sizeof (struct sctp_assocparams
))
5934 len
= sizeof(struct sctp_assocparams
);
5936 if (copy_from_user(&assocparams
, optval
, len
))
5939 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
5941 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
5944 /* Values correspoinding to the specific association */
5946 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
5947 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
5948 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
5949 assocparams
.sasoc_cookie_life
= ktime_to_ms(asoc
->cookie_life
);
5951 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
5955 assocparams
.sasoc_number_peer_destinations
= cnt
;
5957 /* Values corresponding to the endpoint */
5958 struct sctp_sock
*sp
= sctp_sk(sk
);
5960 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
5961 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
5962 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
5963 assocparams
.sasoc_cookie_life
=
5964 sp
->assocparams
.sasoc_cookie_life
;
5965 assocparams
.sasoc_number_peer_destinations
=
5967 sasoc_number_peer_destinations
;
5970 if (put_user(len
, optlen
))
5973 if (copy_to_user(optval
, &assocparams
, len
))
5980 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5982 * This socket option is a boolean flag which turns on or off mapped V4
5983 * addresses. If this option is turned on and the socket is type
5984 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5985 * If this option is turned off, then no mapping will be done of V4
5986 * addresses and a user will receive both PF_INET6 and PF_INET type
5987 * addresses on the socket.
5989 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
5990 char __user
*optval
, int __user
*optlen
)
5993 struct sctp_sock
*sp
= sctp_sk(sk
);
5995 if (len
< sizeof(int))
6000 if (put_user(len
, optlen
))
6002 if (copy_to_user(optval
, &val
, len
))
6009 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6010 * (chapter and verse is quoted at sctp_setsockopt_context())
6012 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
6013 char __user
*optval
, int __user
*optlen
)
6015 struct sctp_assoc_value params
;
6016 struct sctp_sock
*sp
;
6017 struct sctp_association
*asoc
;
6019 if (len
< sizeof(struct sctp_assoc_value
))
6022 len
= sizeof(struct sctp_assoc_value
);
6024 if (copy_from_user(¶ms
, optval
, len
))
6029 if (params
.assoc_id
!= 0) {
6030 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6033 params
.assoc_value
= asoc
->default_rcv_context
;
6035 params
.assoc_value
= sp
->default_rcv_context
;
6038 if (put_user(len
, optlen
))
6040 if (copy_to_user(optval
, ¶ms
, len
))
6047 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6048 * This option will get or set the maximum size to put in any outgoing
6049 * SCTP DATA chunk. If a message is larger than this size it will be
6050 * fragmented by SCTP into the specified size. Note that the underlying
6051 * SCTP implementation may fragment into smaller sized chunks when the
6052 * PMTU of the underlying association is smaller than the value set by
6053 * the user. The default value for this option is '0' which indicates
6054 * the user is NOT limiting fragmentation and only the PMTU will effect
6055 * SCTP's choice of DATA chunk size. Note also that values set larger
6056 * than the maximum size of an IP datagram will effectively let SCTP
6057 * control fragmentation (i.e. the same as setting this option to 0).
6059 * The following structure is used to access and modify this parameter:
6061 * struct sctp_assoc_value {
6062 * sctp_assoc_t assoc_id;
6063 * uint32_t assoc_value;
6066 * assoc_id: This parameter is ignored for one-to-one style sockets.
6067 * For one-to-many style sockets this parameter indicates which
6068 * association the user is performing an action upon. Note that if
6069 * this field's value is zero then the endpoints default value is
6070 * changed (effecting future associations only).
6071 * assoc_value: This parameter specifies the maximum size in bytes.
6073 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
6074 char __user
*optval
, int __user
*optlen
)
6076 struct sctp_assoc_value params
;
6077 struct sctp_association
*asoc
;
6079 if (len
== sizeof(int)) {
6080 pr_warn_ratelimited(DEPRECATED
6082 "Use of int in maxseg socket option.\n"
6083 "Use struct sctp_assoc_value instead\n",
6084 current
->comm
, task_pid_nr(current
));
6085 params
.assoc_id
= 0;
6086 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
6087 len
= sizeof(struct sctp_assoc_value
);
6088 if (copy_from_user(¶ms
, optval
, len
))
6093 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6094 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
6098 params
.assoc_value
= asoc
->frag_point
;
6100 params
.assoc_value
= sctp_sk(sk
)->user_frag
;
6102 if (put_user(len
, optlen
))
6104 if (len
== sizeof(int)) {
6105 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
6108 if (copy_to_user(optval
, ¶ms
, len
))
6116 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6117 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6119 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
6120 char __user
*optval
, int __user
*optlen
)
6124 if (len
< sizeof(int))
6129 val
= sctp_sk(sk
)->frag_interleave
;
6130 if (put_user(len
, optlen
))
6132 if (copy_to_user(optval
, &val
, len
))
6139 * 7.1.25. Set or Get the sctp partial delivery point
6140 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6142 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
6143 char __user
*optval
,
6148 if (len
< sizeof(u32
))
6153 val
= sctp_sk(sk
)->pd_point
;
6154 if (put_user(len
, optlen
))
6156 if (copy_to_user(optval
, &val
, len
))
6163 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6164 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6166 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
6167 char __user
*optval
,
6170 struct sctp_assoc_value params
;
6171 struct sctp_sock
*sp
;
6172 struct sctp_association
*asoc
;
6174 if (len
== sizeof(int)) {
6175 pr_warn_ratelimited(DEPRECATED
6177 "Use of int in max_burst socket option.\n"
6178 "Use struct sctp_assoc_value instead\n",
6179 current
->comm
, task_pid_nr(current
));
6180 params
.assoc_id
= 0;
6181 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
6182 len
= sizeof(struct sctp_assoc_value
);
6183 if (copy_from_user(¶ms
, optval
, len
))
6190 if (params
.assoc_id
!= 0) {
6191 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6194 params
.assoc_value
= asoc
->max_burst
;
6196 params
.assoc_value
= sp
->max_burst
;
6198 if (len
== sizeof(int)) {
6199 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
6202 if (copy_to_user(optval
, ¶ms
, len
))
6210 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
6211 char __user
*optval
, int __user
*optlen
)
6213 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6214 struct sctp_hmacalgo __user
*p
= (void __user
*)optval
;
6215 struct sctp_hmac_algo_param
*hmacs
;
6220 if (!ep
->auth_enable
)
6223 hmacs
= ep
->auth_hmacs_list
;
6224 data_len
= ntohs(hmacs
->param_hdr
.length
) -
6225 sizeof(struct sctp_paramhdr
);
6227 if (len
< sizeof(struct sctp_hmacalgo
) + data_len
)
6230 len
= sizeof(struct sctp_hmacalgo
) + data_len
;
6231 num_idents
= data_len
/ sizeof(u16
);
6233 if (put_user(len
, optlen
))
6235 if (put_user(num_idents
, &p
->shmac_num_idents
))
6237 for (i
= 0; i
< num_idents
; i
++) {
6238 __u16 hmacid
= ntohs(hmacs
->hmac_ids
[i
]);
6240 if (copy_to_user(&p
->shmac_idents
[i
], &hmacid
, sizeof(__u16
)))
6246 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
6247 char __user
*optval
, int __user
*optlen
)
6249 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6250 struct sctp_authkeyid val
;
6251 struct sctp_association
*asoc
;
6253 if (!ep
->auth_enable
)
6256 if (len
< sizeof(struct sctp_authkeyid
))
6259 len
= sizeof(struct sctp_authkeyid
);
6260 if (copy_from_user(&val
, optval
, len
))
6263 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
6264 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
6268 val
.scact_keynumber
= asoc
->active_key_id
;
6270 val
.scact_keynumber
= ep
->active_key_id
;
6272 if (put_user(len
, optlen
))
6274 if (copy_to_user(optval
, &val
, len
))
6280 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
6281 char __user
*optval
, int __user
*optlen
)
6283 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6284 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
6285 struct sctp_authchunks val
;
6286 struct sctp_association
*asoc
;
6287 struct sctp_chunks_param
*ch
;
6291 if (!ep
->auth_enable
)
6294 if (len
< sizeof(struct sctp_authchunks
))
6297 if (copy_from_user(&val
, optval
, sizeof(val
)))
6300 to
= p
->gauth_chunks
;
6301 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
6305 ch
= asoc
->peer
.peer_chunks
;
6309 /* See if the user provided enough room for all the data */
6310 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(struct sctp_paramhdr
);
6311 if (len
< num_chunks
)
6314 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
6317 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
6318 if (put_user(len
, optlen
))
6320 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
6325 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
6326 char __user
*optval
, int __user
*optlen
)
6328 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6329 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
6330 struct sctp_authchunks val
;
6331 struct sctp_association
*asoc
;
6332 struct sctp_chunks_param
*ch
;
6336 if (!ep
->auth_enable
)
6339 if (len
< sizeof(struct sctp_authchunks
))
6342 if (copy_from_user(&val
, optval
, sizeof(val
)))
6345 to
= p
->gauth_chunks
;
6346 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
6347 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
6351 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
6353 ch
= ep
->auth_chunk_list
;
6358 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(struct sctp_paramhdr
);
6359 if (len
< sizeof(struct sctp_authchunks
) + num_chunks
)
6362 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
6365 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
6366 if (put_user(len
, optlen
))
6368 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
6375 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6376 * This option gets the current number of associations that are attached
6377 * to a one-to-many style socket. The option value is an uint32_t.
6379 static int sctp_getsockopt_assoc_number(struct sock
*sk
, int len
,
6380 char __user
*optval
, int __user
*optlen
)
6382 struct sctp_sock
*sp
= sctp_sk(sk
);
6383 struct sctp_association
*asoc
;
6386 if (sctp_style(sk
, TCP
))
6389 if (len
< sizeof(u32
))
6394 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6398 if (put_user(len
, optlen
))
6400 if (copy_to_user(optval
, &val
, len
))
6407 * 8.1.23 SCTP_AUTO_ASCONF
6408 * See the corresponding setsockopt entry as description
6410 static int sctp_getsockopt_auto_asconf(struct sock
*sk
, int len
,
6411 char __user
*optval
, int __user
*optlen
)
6415 if (len
< sizeof(int))
6419 if (sctp_sk(sk
)->do_auto_asconf
&& sctp_is_ep_boundall(sk
))
6421 if (put_user(len
, optlen
))
6423 if (copy_to_user(optval
, &val
, len
))
6429 * 8.2.6. Get the Current Identifiers of Associations
6430 * (SCTP_GET_ASSOC_ID_LIST)
6432 * This option gets the current list of SCTP association identifiers of
6433 * the SCTP associations handled by a one-to-many style socket.
6435 static int sctp_getsockopt_assoc_ids(struct sock
*sk
, int len
,
6436 char __user
*optval
, int __user
*optlen
)
6438 struct sctp_sock
*sp
= sctp_sk(sk
);
6439 struct sctp_association
*asoc
;
6440 struct sctp_assoc_ids
*ids
;
6443 if (sctp_style(sk
, TCP
))
6446 if (len
< sizeof(struct sctp_assoc_ids
))
6449 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6453 if (len
< sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
)
6456 len
= sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
;
6458 ids
= kmalloc(len
, GFP_USER
| __GFP_NOWARN
);
6462 ids
->gaids_number_of_ids
= num
;
6464 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6465 ids
->gaids_assoc_id
[num
++] = asoc
->assoc_id
;
6468 if (put_user(len
, optlen
) || copy_to_user(optval
, ids
, len
)) {
6478 * SCTP_PEER_ADDR_THLDS
6480 * This option allows us to fetch the partially failed threshold for one or all
6481 * transports in an association. See Section 6.1 of:
6482 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6484 static int sctp_getsockopt_paddr_thresholds(struct sock
*sk
,
6485 char __user
*optval
,
6489 struct sctp_paddrthlds val
;
6490 struct sctp_transport
*trans
;
6491 struct sctp_association
*asoc
;
6493 if (len
< sizeof(struct sctp_paddrthlds
))
6495 len
= sizeof(struct sctp_paddrthlds
);
6496 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
, len
))
6499 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
6500 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
6504 val
.spt_pathpfthld
= asoc
->pf_retrans
;
6505 val
.spt_pathmaxrxt
= asoc
->pathmaxrxt
;
6507 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
6512 val
.spt_pathmaxrxt
= trans
->pathmaxrxt
;
6513 val
.spt_pathpfthld
= trans
->pf_retrans
;
6516 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
6523 * SCTP_GET_ASSOC_STATS
6525 * This option retrieves local per endpoint statistics. It is modeled
6526 * after OpenSolaris' implementation
6528 static int sctp_getsockopt_assoc_stats(struct sock
*sk
, int len
,
6529 char __user
*optval
,
6532 struct sctp_assoc_stats sas
;
6533 struct sctp_association
*asoc
= NULL
;
6535 /* User must provide at least the assoc id */
6536 if (len
< sizeof(sctp_assoc_t
))
6539 /* Allow the struct to grow and fill in as much as possible */
6540 len
= min_t(size_t, len
, sizeof(sas
));
6542 if (copy_from_user(&sas
, optval
, len
))
6545 asoc
= sctp_id2assoc(sk
, sas
.sas_assoc_id
);
6549 sas
.sas_rtxchunks
= asoc
->stats
.rtxchunks
;
6550 sas
.sas_gapcnt
= asoc
->stats
.gapcnt
;
6551 sas
.sas_outofseqtsns
= asoc
->stats
.outofseqtsns
;
6552 sas
.sas_osacks
= asoc
->stats
.osacks
;
6553 sas
.sas_isacks
= asoc
->stats
.isacks
;
6554 sas
.sas_octrlchunks
= asoc
->stats
.octrlchunks
;
6555 sas
.sas_ictrlchunks
= asoc
->stats
.ictrlchunks
;
6556 sas
.sas_oodchunks
= asoc
->stats
.oodchunks
;
6557 sas
.sas_iodchunks
= asoc
->stats
.iodchunks
;
6558 sas
.sas_ouodchunks
= asoc
->stats
.ouodchunks
;
6559 sas
.sas_iuodchunks
= asoc
->stats
.iuodchunks
;
6560 sas
.sas_idupchunks
= asoc
->stats
.idupchunks
;
6561 sas
.sas_opackets
= asoc
->stats
.opackets
;
6562 sas
.sas_ipackets
= asoc
->stats
.ipackets
;
6564 /* New high max rto observed, will return 0 if not a single
6565 * RTO update took place. obs_rto_ipaddr will be bogus
6568 sas
.sas_maxrto
= asoc
->stats
.max_obs_rto
;
6569 memcpy(&sas
.sas_obs_rto_ipaddr
, &asoc
->stats
.obs_rto_ipaddr
,
6570 sizeof(struct sockaddr_storage
));
6572 /* Mark beginning of a new observation period */
6573 asoc
->stats
.max_obs_rto
= asoc
->rto_min
;
6575 if (put_user(len
, optlen
))
6578 pr_debug("%s: len:%d, assoc_id:%d\n", __func__
, len
, sas
.sas_assoc_id
);
6580 if (copy_to_user(optval
, &sas
, len
))
6586 static int sctp_getsockopt_recvrcvinfo(struct sock
*sk
, int len
,
6587 char __user
*optval
,
6592 if (len
< sizeof(int))
6596 if (sctp_sk(sk
)->recvrcvinfo
)
6598 if (put_user(len
, optlen
))
6600 if (copy_to_user(optval
, &val
, len
))
6606 static int sctp_getsockopt_recvnxtinfo(struct sock
*sk
, int len
,
6607 char __user
*optval
,
6612 if (len
< sizeof(int))
6616 if (sctp_sk(sk
)->recvnxtinfo
)
6618 if (put_user(len
, optlen
))
6620 if (copy_to_user(optval
, &val
, len
))
6626 static int sctp_getsockopt_pr_supported(struct sock
*sk
, int len
,
6627 char __user
*optval
,
6630 struct sctp_assoc_value params
;
6631 struct sctp_association
*asoc
;
6632 int retval
= -EFAULT
;
6634 if (len
< sizeof(params
)) {
6639 len
= sizeof(params
);
6640 if (copy_from_user(¶ms
, optval
, len
))
6643 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6645 params
.assoc_value
= asoc
->prsctp_enable
;
6646 } else if (!params
.assoc_id
) {
6647 struct sctp_sock
*sp
= sctp_sk(sk
);
6649 params
.assoc_value
= sp
->ep
->prsctp_enable
;
6655 if (put_user(len
, optlen
))
6658 if (copy_to_user(optval
, ¶ms
, len
))
6667 static int sctp_getsockopt_default_prinfo(struct sock
*sk
, int len
,
6668 char __user
*optval
,
6671 struct sctp_default_prinfo info
;
6672 struct sctp_association
*asoc
;
6673 int retval
= -EFAULT
;
6675 if (len
< sizeof(info
)) {
6681 if (copy_from_user(&info
, optval
, len
))
6684 asoc
= sctp_id2assoc(sk
, info
.pr_assoc_id
);
6686 info
.pr_policy
= SCTP_PR_POLICY(asoc
->default_flags
);
6687 info
.pr_value
= asoc
->default_timetolive
;
6688 } else if (!info
.pr_assoc_id
) {
6689 struct sctp_sock
*sp
= sctp_sk(sk
);
6691 info
.pr_policy
= SCTP_PR_POLICY(sp
->default_flags
);
6692 info
.pr_value
= sp
->default_timetolive
;
6698 if (put_user(len
, optlen
))
6701 if (copy_to_user(optval
, &info
, len
))
6710 static int sctp_getsockopt_pr_assocstatus(struct sock
*sk
, int len
,
6711 char __user
*optval
,
6714 struct sctp_prstatus params
;
6715 struct sctp_association
*asoc
;
6717 int retval
= -EINVAL
;
6719 if (len
< sizeof(params
))
6722 len
= sizeof(params
);
6723 if (copy_from_user(¶ms
, optval
, len
)) {
6728 policy
= params
.sprstat_policy
;
6729 if (policy
& ~SCTP_PR_SCTP_MASK
)
6732 asoc
= sctp_id2assoc(sk
, params
.sprstat_assoc_id
);
6736 if (policy
== SCTP_PR_SCTP_NONE
) {
6737 params
.sprstat_abandoned_unsent
= 0;
6738 params
.sprstat_abandoned_sent
= 0;
6739 for (policy
= 0; policy
<= SCTP_PR_INDEX(MAX
); policy
++) {
6740 params
.sprstat_abandoned_unsent
+=
6741 asoc
->abandoned_unsent
[policy
];
6742 params
.sprstat_abandoned_sent
+=
6743 asoc
->abandoned_sent
[policy
];
6746 params
.sprstat_abandoned_unsent
=
6747 asoc
->abandoned_unsent
[__SCTP_PR_INDEX(policy
)];
6748 params
.sprstat_abandoned_sent
=
6749 asoc
->abandoned_sent
[__SCTP_PR_INDEX(policy
)];
6752 if (put_user(len
, optlen
)) {
6757 if (copy_to_user(optval
, ¶ms
, len
)) {
6768 static int sctp_getsockopt_pr_streamstatus(struct sock
*sk
, int len
,
6769 char __user
*optval
,
6772 struct sctp_stream_out_ext
*streamoute
;
6773 struct sctp_association
*asoc
;
6774 struct sctp_prstatus params
;
6775 int retval
= -EINVAL
;
6778 if (len
< sizeof(params
))
6781 len
= sizeof(params
);
6782 if (copy_from_user(¶ms
, optval
, len
)) {
6787 policy
= params
.sprstat_policy
;
6788 if (policy
& ~SCTP_PR_SCTP_MASK
)
6791 asoc
= sctp_id2assoc(sk
, params
.sprstat_assoc_id
);
6792 if (!asoc
|| params
.sprstat_sid
>= asoc
->stream
.outcnt
)
6795 streamoute
= asoc
->stream
.out
[params
.sprstat_sid
].ext
;
6797 /* Not allocated yet, means all stats are 0 */
6798 params
.sprstat_abandoned_unsent
= 0;
6799 params
.sprstat_abandoned_sent
= 0;
6804 if (policy
== SCTP_PR_SCTP_NONE
) {
6805 params
.sprstat_abandoned_unsent
= 0;
6806 params
.sprstat_abandoned_sent
= 0;
6807 for (policy
= 0; policy
<= SCTP_PR_INDEX(MAX
); policy
++) {
6808 params
.sprstat_abandoned_unsent
+=
6809 streamoute
->abandoned_unsent
[policy
];
6810 params
.sprstat_abandoned_sent
+=
6811 streamoute
->abandoned_sent
[policy
];
6814 params
.sprstat_abandoned_unsent
=
6815 streamoute
->abandoned_unsent
[__SCTP_PR_INDEX(policy
)];
6816 params
.sprstat_abandoned_sent
=
6817 streamoute
->abandoned_sent
[__SCTP_PR_INDEX(policy
)];
6820 if (put_user(len
, optlen
) || copy_to_user(optval
, ¶ms
, len
)) {
6831 static int sctp_getsockopt_reconfig_supported(struct sock
*sk
, int len
,
6832 char __user
*optval
,
6835 struct sctp_assoc_value params
;
6836 struct sctp_association
*asoc
;
6837 int retval
= -EFAULT
;
6839 if (len
< sizeof(params
)) {
6844 len
= sizeof(params
);
6845 if (copy_from_user(¶ms
, optval
, len
))
6848 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6850 params
.assoc_value
= asoc
->reconf_enable
;
6851 } else if (!params
.assoc_id
) {
6852 struct sctp_sock
*sp
= sctp_sk(sk
);
6854 params
.assoc_value
= sp
->ep
->reconf_enable
;
6860 if (put_user(len
, optlen
))
6863 if (copy_to_user(optval
, ¶ms
, len
))
6872 static int sctp_getsockopt_enable_strreset(struct sock
*sk
, int len
,
6873 char __user
*optval
,
6876 struct sctp_assoc_value params
;
6877 struct sctp_association
*asoc
;
6878 int retval
= -EFAULT
;
6880 if (len
< sizeof(params
)) {
6885 len
= sizeof(params
);
6886 if (copy_from_user(¶ms
, optval
, len
))
6889 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6891 params
.assoc_value
= asoc
->strreset_enable
;
6892 } else if (!params
.assoc_id
) {
6893 struct sctp_sock
*sp
= sctp_sk(sk
);
6895 params
.assoc_value
= sp
->ep
->strreset_enable
;
6901 if (put_user(len
, optlen
))
6904 if (copy_to_user(optval
, ¶ms
, len
))
6913 static int sctp_getsockopt_scheduler(struct sock
*sk
, int len
,
6914 char __user
*optval
,
6917 struct sctp_assoc_value params
;
6918 struct sctp_association
*asoc
;
6919 int retval
= -EFAULT
;
6921 if (len
< sizeof(params
)) {
6926 len
= sizeof(params
);
6927 if (copy_from_user(¶ms
, optval
, len
))
6930 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6936 params
.assoc_value
= sctp_sched_get_sched(asoc
);
6938 if (put_user(len
, optlen
))
6941 if (copy_to_user(optval
, ¶ms
, len
))
6950 static int sctp_getsockopt_scheduler_value(struct sock
*sk
, int len
,
6951 char __user
*optval
,
6954 struct sctp_stream_value params
;
6955 struct sctp_association
*asoc
;
6956 int retval
= -EFAULT
;
6958 if (len
< sizeof(params
)) {
6963 len
= sizeof(params
);
6964 if (copy_from_user(¶ms
, optval
, len
))
6967 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6973 retval
= sctp_sched_get_value(asoc
, params
.stream_id
,
6974 ¶ms
.stream_value
);
6978 if (put_user(len
, optlen
)) {
6983 if (copy_to_user(optval
, ¶ms
, len
)) {
6992 static int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
6993 char __user
*optval
, int __user
*optlen
)
6998 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
7000 /* I can hardly begin to describe how wrong this is. This is
7001 * so broken as to be worse than useless. The API draft
7002 * REALLY is NOT helpful here... I am not convinced that the
7003 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
7004 * are at all well-founded.
7006 if (level
!= SOL_SCTP
) {
7007 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
7009 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
7013 if (get_user(len
, optlen
))
7023 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
7025 case SCTP_DISABLE_FRAGMENTS
:
7026 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
7030 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
7032 case SCTP_AUTOCLOSE
:
7033 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
7035 case SCTP_SOCKOPT_PEELOFF
:
7036 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
7038 case SCTP_SOCKOPT_PEELOFF_FLAGS
:
7039 retval
= sctp_getsockopt_peeloff_flags(sk
, len
, optval
, optlen
);
7041 case SCTP_PEER_ADDR_PARAMS
:
7042 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
7045 case SCTP_DELAYED_SACK
:
7046 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
7050 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
7052 case SCTP_GET_PEER_ADDRS
:
7053 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
7056 case SCTP_GET_LOCAL_ADDRS
:
7057 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
7060 case SCTP_SOCKOPT_CONNECTX3
:
7061 retval
= sctp_getsockopt_connectx3(sk
, len
, optval
, optlen
);
7063 case SCTP_DEFAULT_SEND_PARAM
:
7064 retval
= sctp_getsockopt_default_send_param(sk
, len
,
7067 case SCTP_DEFAULT_SNDINFO
:
7068 retval
= sctp_getsockopt_default_sndinfo(sk
, len
,
7071 case SCTP_PRIMARY_ADDR
:
7072 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
7075 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
7078 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
7080 case SCTP_ASSOCINFO
:
7081 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
7083 case SCTP_I_WANT_MAPPED_V4_ADDR
:
7084 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
7087 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
7089 case SCTP_GET_PEER_ADDR_INFO
:
7090 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
7093 case SCTP_ADAPTATION_LAYER
:
7094 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
7098 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
7100 case SCTP_FRAGMENT_INTERLEAVE
:
7101 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
7104 case SCTP_PARTIAL_DELIVERY_POINT
:
7105 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
7108 case SCTP_MAX_BURST
:
7109 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
7112 case SCTP_AUTH_CHUNK
:
7113 case SCTP_AUTH_DELETE_KEY
:
7114 retval
= -EOPNOTSUPP
;
7116 case SCTP_HMAC_IDENT
:
7117 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
7119 case SCTP_AUTH_ACTIVE_KEY
:
7120 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
7122 case SCTP_PEER_AUTH_CHUNKS
:
7123 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
7126 case SCTP_LOCAL_AUTH_CHUNKS
:
7127 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
7130 case SCTP_GET_ASSOC_NUMBER
:
7131 retval
= sctp_getsockopt_assoc_number(sk
, len
, optval
, optlen
);
7133 case SCTP_GET_ASSOC_ID_LIST
:
7134 retval
= sctp_getsockopt_assoc_ids(sk
, len
, optval
, optlen
);
7136 case SCTP_AUTO_ASCONF
:
7137 retval
= sctp_getsockopt_auto_asconf(sk
, len
, optval
, optlen
);
7139 case SCTP_PEER_ADDR_THLDS
:
7140 retval
= sctp_getsockopt_paddr_thresholds(sk
, optval
, len
, optlen
);
7142 case SCTP_GET_ASSOC_STATS
:
7143 retval
= sctp_getsockopt_assoc_stats(sk
, len
, optval
, optlen
);
7145 case SCTP_RECVRCVINFO
:
7146 retval
= sctp_getsockopt_recvrcvinfo(sk
, len
, optval
, optlen
);
7148 case SCTP_RECVNXTINFO
:
7149 retval
= sctp_getsockopt_recvnxtinfo(sk
, len
, optval
, optlen
);
7151 case SCTP_PR_SUPPORTED
:
7152 retval
= sctp_getsockopt_pr_supported(sk
, len
, optval
, optlen
);
7154 case SCTP_DEFAULT_PRINFO
:
7155 retval
= sctp_getsockopt_default_prinfo(sk
, len
, optval
,
7158 case SCTP_PR_ASSOC_STATUS
:
7159 retval
= sctp_getsockopt_pr_assocstatus(sk
, len
, optval
,
7162 case SCTP_PR_STREAM_STATUS
:
7163 retval
= sctp_getsockopt_pr_streamstatus(sk
, len
, optval
,
7166 case SCTP_RECONFIG_SUPPORTED
:
7167 retval
= sctp_getsockopt_reconfig_supported(sk
, len
, optval
,
7170 case SCTP_ENABLE_STREAM_RESET
:
7171 retval
= sctp_getsockopt_enable_strreset(sk
, len
, optval
,
7174 case SCTP_STREAM_SCHEDULER
:
7175 retval
= sctp_getsockopt_scheduler(sk
, len
, optval
,
7178 case SCTP_STREAM_SCHEDULER_VALUE
:
7179 retval
= sctp_getsockopt_scheduler_value(sk
, len
, optval
,
7183 retval
= -ENOPROTOOPT
;
7191 static int sctp_hash(struct sock
*sk
)
7197 static void sctp_unhash(struct sock
*sk
)
7202 /* Check if port is acceptable. Possibly find first available port.
7204 * The port hash table (contained in the 'global' SCTP protocol storage
7205 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
7206 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
7207 * list (the list number is the port number hashed out, so as you
7208 * would expect from a hash function, all the ports in a given list have
7209 * such a number that hashes out to the same list number; you were
7210 * expecting that, right?); so each list has a set of ports, with a
7211 * link to the socket (struct sock) that uses it, the port number and
7212 * a fastreuse flag (FIXME: NPI ipg).
7214 static struct sctp_bind_bucket
*sctp_bucket_create(
7215 struct sctp_bind_hashbucket
*head
, struct net
*, unsigned short snum
);
7217 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
7219 struct sctp_bind_hashbucket
*head
; /* hash list */
7220 struct sctp_bind_bucket
*pp
;
7221 unsigned short snum
;
7224 snum
= ntohs(addr
->v4
.sin_port
);
7226 pr_debug("%s: begins, snum:%d\n", __func__
, snum
);
7231 /* Search for an available port. */
7232 int low
, high
, remaining
, index
;
7234 struct net
*net
= sock_net(sk
);
7236 inet_get_local_port_range(net
, &low
, &high
);
7237 remaining
= (high
- low
) + 1;
7238 rover
= prandom_u32() % remaining
+ low
;
7242 if ((rover
< low
) || (rover
> high
))
7244 if (inet_is_local_reserved_port(net
, rover
))
7246 index
= sctp_phashfn(sock_net(sk
), rover
);
7247 head
= &sctp_port_hashtable
[index
];
7248 spin_lock(&head
->lock
);
7249 sctp_for_each_hentry(pp
, &head
->chain
)
7250 if ((pp
->port
== rover
) &&
7251 net_eq(sock_net(sk
), pp
->net
))
7255 spin_unlock(&head
->lock
);
7256 } while (--remaining
> 0);
7258 /* Exhausted local port range during search? */
7263 /* OK, here is the one we will use. HEAD (the port
7264 * hash table list entry) is non-NULL and we hold it's
7269 /* We are given an specific port number; we verify
7270 * that it is not being used. If it is used, we will
7271 * exahust the search in the hash list corresponding
7272 * to the port number (snum) - we detect that with the
7273 * port iterator, pp being NULL.
7275 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
), snum
)];
7276 spin_lock(&head
->lock
);
7277 sctp_for_each_hentry(pp
, &head
->chain
) {
7278 if ((pp
->port
== snum
) && net_eq(pp
->net
, sock_net(sk
)))
7285 if (!hlist_empty(&pp
->owner
)) {
7286 /* We had a port hash table hit - there is an
7287 * available port (pp != NULL) and it is being
7288 * used by other socket (pp->owner not empty); that other
7289 * socket is going to be sk2.
7291 int reuse
= sk
->sk_reuse
;
7294 pr_debug("%s: found a possible match\n", __func__
);
7296 if (pp
->fastreuse
&& sk
->sk_reuse
&&
7297 sk
->sk_state
!= SCTP_SS_LISTENING
)
7300 /* Run through the list of sockets bound to the port
7301 * (pp->port) [via the pointers bind_next and
7302 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
7303 * we get the endpoint they describe and run through
7304 * the endpoint's list of IP (v4 or v6) addresses,
7305 * comparing each of the addresses with the address of
7306 * the socket sk. If we find a match, then that means
7307 * that this port/socket (sk) combination are already
7310 sk_for_each_bound(sk2
, &pp
->owner
) {
7311 struct sctp_endpoint
*ep2
;
7312 ep2
= sctp_sk(sk2
)->ep
;
7315 (reuse
&& sk2
->sk_reuse
&&
7316 sk2
->sk_state
!= SCTP_SS_LISTENING
))
7319 if (sctp_bind_addr_conflict(&ep2
->base
.bind_addr
, addr
,
7320 sctp_sk(sk2
), sctp_sk(sk
))) {
7326 pr_debug("%s: found a match\n", __func__
);
7329 /* If there was a hash table miss, create a new port. */
7331 if (!pp
&& !(pp
= sctp_bucket_create(head
, sock_net(sk
), snum
)))
7334 /* In either case (hit or miss), make sure fastreuse is 1 only
7335 * if sk->sk_reuse is too (that is, if the caller requested
7336 * SO_REUSEADDR on this socket -sk-).
7338 if (hlist_empty(&pp
->owner
)) {
7339 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
7343 } else if (pp
->fastreuse
&&
7344 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
7347 /* We are set, so fill up all the data in the hash table
7348 * entry, tie the socket list information with the rest of the
7349 * sockets FIXME: Blurry, NPI (ipg).
7352 if (!sctp_sk(sk
)->bind_hash
) {
7353 inet_sk(sk
)->inet_num
= snum
;
7354 sk_add_bind_node(sk
, &pp
->owner
);
7355 sctp_sk(sk
)->bind_hash
= pp
;
7360 spin_unlock(&head
->lock
);
7367 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
7368 * port is requested.
7370 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
7372 union sctp_addr addr
;
7373 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
7375 /* Set up a dummy address struct from the sk. */
7376 af
->from_sk(&addr
, sk
);
7377 addr
.v4
.sin_port
= htons(snum
);
7379 /* Note: sk->sk_num gets filled in if ephemeral port request. */
7380 return !!sctp_get_port_local(sk
, &addr
);
7384 * Move a socket to LISTENING state.
7386 static int sctp_listen_start(struct sock
*sk
, int backlog
)
7388 struct sctp_sock
*sp
= sctp_sk(sk
);
7389 struct sctp_endpoint
*ep
= sp
->ep
;
7390 struct crypto_shash
*tfm
= NULL
;
7393 /* Allocate HMAC for generating cookie. */
7394 if (!sp
->hmac
&& sp
->sctp_hmac_alg
) {
7395 sprintf(alg
, "hmac(%s)", sp
->sctp_hmac_alg
);
7396 tfm
= crypto_alloc_shash(alg
, 0, 0);
7398 net_info_ratelimited("failed to load transform for %s: %ld\n",
7399 sp
->sctp_hmac_alg
, PTR_ERR(tfm
));
7402 sctp_sk(sk
)->hmac
= tfm
;
7406 * If a bind() or sctp_bindx() is not called prior to a listen()
7407 * call that allows new associations to be accepted, the system
7408 * picks an ephemeral port and will choose an address set equivalent
7409 * to binding with a wildcard address.
7411 * This is not currently spelled out in the SCTP sockets
7412 * extensions draft, but follows the practice as seen in TCP
7416 sk
->sk_state
= SCTP_SS_LISTENING
;
7417 if (!ep
->base
.bind_addr
.port
) {
7418 if (sctp_autobind(sk
))
7421 if (sctp_get_port(sk
, inet_sk(sk
)->inet_num
)) {
7422 sk
->sk_state
= SCTP_SS_CLOSED
;
7427 sk
->sk_max_ack_backlog
= backlog
;
7428 sctp_hash_endpoint(ep
);
7433 * 4.1.3 / 5.1.3 listen()
7435 * By default, new associations are not accepted for UDP style sockets.
7436 * An application uses listen() to mark a socket as being able to
7437 * accept new associations.
7439 * On TCP style sockets, applications use listen() to ready the SCTP
7440 * endpoint for accepting inbound associations.
7442 * On both types of endpoints a backlog of '0' disables listening.
7444 * Move a socket to LISTENING state.
7446 int sctp_inet_listen(struct socket
*sock
, int backlog
)
7448 struct sock
*sk
= sock
->sk
;
7449 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
7452 if (unlikely(backlog
< 0))
7457 /* Peeled-off sockets are not allowed to listen(). */
7458 if (sctp_style(sk
, UDP_HIGH_BANDWIDTH
))
7461 if (sock
->state
!= SS_UNCONNECTED
)
7464 if (!sctp_sstate(sk
, LISTENING
) && !sctp_sstate(sk
, CLOSED
))
7467 /* If backlog is zero, disable listening. */
7469 if (sctp_sstate(sk
, CLOSED
))
7473 sctp_unhash_endpoint(ep
);
7474 sk
->sk_state
= SCTP_SS_CLOSED
;
7476 sctp_sk(sk
)->bind_hash
->fastreuse
= 1;
7480 /* If we are already listening, just update the backlog */
7481 if (sctp_sstate(sk
, LISTENING
))
7482 sk
->sk_max_ack_backlog
= backlog
;
7484 err
= sctp_listen_start(sk
, backlog
);
7496 * This function is done by modeling the current datagram_poll() and the
7497 * tcp_poll(). Note that, based on these implementations, we don't
7498 * lock the socket in this function, even though it seems that,
7499 * ideally, locking or some other mechanisms can be used to ensure
7500 * the integrity of the counters (sndbuf and wmem_alloc) used
7501 * in this place. We assume that we don't need locks either until proven
7504 * Another thing to note is that we include the Async I/O support
7505 * here, again, by modeling the current TCP/UDP code. We don't have
7506 * a good way to test with it yet.
7508 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
7510 struct sock
*sk
= sock
->sk
;
7511 struct sctp_sock
*sp
= sctp_sk(sk
);
7514 poll_wait(file
, sk_sleep(sk
), wait
);
7516 sock_rps_record_flow(sk
);
7518 /* A TCP-style listening socket becomes readable when the accept queue
7521 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
7522 return (!list_empty(&sp
->ep
->asocs
)) ?
7523 (POLLIN
| POLLRDNORM
) : 0;
7527 /* Is there any exceptional events? */
7528 if (sk
->sk_err
|| !skb_queue_empty_lockless(&sk
->sk_error_queue
))
7530 (sock_flag(sk
, SOCK_SELECT_ERR_QUEUE
) ? POLLPRI
: 0);
7531 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7532 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
7533 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
7536 /* Is it readable? Reconsider this code with TCP-style support. */
7537 if (!skb_queue_empty_lockless(&sk
->sk_receive_queue
))
7538 mask
|= POLLIN
| POLLRDNORM
;
7540 /* The association is either gone or not ready. */
7541 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
7544 /* Is it writable? */
7545 if (sctp_writeable(sk
)) {
7546 mask
|= POLLOUT
| POLLWRNORM
;
7548 sk_set_bit(SOCKWQ_ASYNC_NOSPACE
, sk
);
7550 * Since the socket is not locked, the buffer
7551 * might be made available after the writeable check and
7552 * before the bit is set. This could cause a lost I/O
7553 * signal. tcp_poll() has a race breaker for this race
7554 * condition. Based on their implementation, we put
7555 * in the following code to cover it as well.
7557 if (sctp_writeable(sk
))
7558 mask
|= POLLOUT
| POLLWRNORM
;
7563 /********************************************************************
7564 * 2nd Level Abstractions
7565 ********************************************************************/
7567 static struct sctp_bind_bucket
*sctp_bucket_create(
7568 struct sctp_bind_hashbucket
*head
, struct net
*net
, unsigned short snum
)
7570 struct sctp_bind_bucket
*pp
;
7572 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
7574 SCTP_DBG_OBJCNT_INC(bind_bucket
);
7577 INIT_HLIST_HEAD(&pp
->owner
);
7579 hlist_add_head(&pp
->node
, &head
->chain
);
7584 /* Caller must hold hashbucket lock for this tb with local BH disabled */
7585 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
7587 if (pp
&& hlist_empty(&pp
->owner
)) {
7588 __hlist_del(&pp
->node
);
7589 kmem_cache_free(sctp_bucket_cachep
, pp
);
7590 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
7594 /* Release this socket's reference to a local port. */
7595 static inline void __sctp_put_port(struct sock
*sk
)
7597 struct sctp_bind_hashbucket
*head
=
7598 &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
),
7599 inet_sk(sk
)->inet_num
)];
7600 struct sctp_bind_bucket
*pp
;
7602 spin_lock(&head
->lock
);
7603 pp
= sctp_sk(sk
)->bind_hash
;
7604 __sk_del_bind_node(sk
);
7605 sctp_sk(sk
)->bind_hash
= NULL
;
7606 inet_sk(sk
)->inet_num
= 0;
7607 sctp_bucket_destroy(pp
);
7608 spin_unlock(&head
->lock
);
7611 void sctp_put_port(struct sock
*sk
)
7614 __sctp_put_port(sk
);
7619 * The system picks an ephemeral port and choose an address set equivalent
7620 * to binding with a wildcard address.
7621 * One of those addresses will be the primary address for the association.
7622 * This automatically enables the multihoming capability of SCTP.
7624 static int sctp_autobind(struct sock
*sk
)
7626 union sctp_addr autoaddr
;
7630 /* Initialize a local sockaddr structure to INADDR_ANY. */
7631 af
= sctp_sk(sk
)->pf
->af
;
7633 port
= htons(inet_sk(sk
)->inet_num
);
7634 af
->inaddr_any(&autoaddr
, port
);
7636 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
7639 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
7642 * 4.2 The cmsghdr Structure *
7644 * When ancillary data is sent or received, any number of ancillary data
7645 * objects can be specified by the msg_control and msg_controllen members of
7646 * the msghdr structure, because each object is preceded by
7647 * a cmsghdr structure defining the object's length (the cmsg_len member).
7648 * Historically Berkeley-derived implementations have passed only one object
7649 * at a time, but this API allows multiple objects to be
7650 * passed in a single call to sendmsg() or recvmsg(). The following example
7651 * shows two ancillary data objects in a control buffer.
7653 * |<--------------------------- msg_controllen -------------------------->|
7656 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
7658 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
7661 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
7663 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
7666 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7667 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
7669 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
7671 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7678 static int sctp_msghdr_parse(const struct msghdr
*msg
, struct sctp_cmsgs
*cmsgs
)
7680 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
7681 struct cmsghdr
*cmsg
;
7683 for_each_cmsghdr(cmsg
, my_msg
) {
7684 if (!CMSG_OK(my_msg
, cmsg
))
7687 /* Should we parse this header or ignore? */
7688 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
7691 /* Strictly check lengths following example in SCM code. */
7692 switch (cmsg
->cmsg_type
) {
7694 /* SCTP Socket API Extension
7695 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
7697 * This cmsghdr structure provides information for
7698 * initializing new SCTP associations with sendmsg().
7699 * The SCTP_INITMSG socket option uses this same data
7700 * structure. This structure is not used for
7703 * cmsg_level cmsg_type cmsg_data[]
7704 * ------------ ------------ ----------------------
7705 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
7707 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_initmsg
)))
7710 cmsgs
->init
= CMSG_DATA(cmsg
);
7714 /* SCTP Socket API Extension
7715 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
7717 * This cmsghdr structure specifies SCTP options for
7718 * sendmsg() and describes SCTP header information
7719 * about a received message through recvmsg().
7721 * cmsg_level cmsg_type cmsg_data[]
7722 * ------------ ------------ ----------------------
7723 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
7725 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
7728 cmsgs
->srinfo
= CMSG_DATA(cmsg
);
7730 if (cmsgs
->srinfo
->sinfo_flags
&
7731 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
7732 SCTP_SACK_IMMEDIATELY
| SCTP_PR_SCTP_MASK
|
7733 SCTP_ABORT
| SCTP_EOF
))
7738 /* SCTP Socket API Extension
7739 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
7741 * This cmsghdr structure specifies SCTP options for
7742 * sendmsg(). This structure and SCTP_RCVINFO replaces
7743 * SCTP_SNDRCV which has been deprecated.
7745 * cmsg_level cmsg_type cmsg_data[]
7746 * ------------ ------------ ---------------------
7747 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
7749 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_sndinfo
)))
7752 cmsgs
->sinfo
= CMSG_DATA(cmsg
);
7754 if (cmsgs
->sinfo
->snd_flags
&
7755 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
7756 SCTP_SACK_IMMEDIATELY
| SCTP_PR_SCTP_MASK
|
7757 SCTP_ABORT
| SCTP_EOF
))
7769 * Wait for a packet..
7770 * Note: This function is the same function as in core/datagram.c
7771 * with a few modifications to make lksctp work.
7773 static int sctp_wait_for_packet(struct sock
*sk
, int *err
, long *timeo_p
)
7778 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
7780 /* Socket errors? */
7781 error
= sock_error(sk
);
7785 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7788 /* Socket shut down? */
7789 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7792 /* Sequenced packets can come disconnected. If so we report the
7797 /* Is there a good reason to think that we may receive some data? */
7798 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
7801 /* Handle signals. */
7802 if (signal_pending(current
))
7805 /* Let another process have a go. Since we are going to sleep
7806 * anyway. Note: This may cause odd behaviors if the message
7807 * does not fit in the user's buffer, but this seems to be the
7808 * only way to honor MSG_DONTWAIT realistically.
7811 *timeo_p
= schedule_timeout(*timeo_p
);
7815 finish_wait(sk_sleep(sk
), &wait
);
7819 error
= sock_intr_errno(*timeo_p
);
7822 finish_wait(sk_sleep(sk
), &wait
);
7827 /* Receive a datagram.
7828 * Note: This is pretty much the same routine as in core/datagram.c
7829 * with a few changes to make lksctp work.
7831 struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
7832 int noblock
, int *err
)
7835 struct sk_buff
*skb
;
7838 timeo
= sock_rcvtimeo(sk
, noblock
);
7840 pr_debug("%s: timeo:%ld, max:%ld\n", __func__
, timeo
,
7841 MAX_SCHEDULE_TIMEOUT
);
7844 /* Again only user level code calls this function,
7845 * so nothing interrupt level
7846 * will suddenly eat the receive_queue.
7848 * Look at current nfs client by the way...
7849 * However, this function was correct in any case. 8)
7851 if (flags
& MSG_PEEK
) {
7852 skb
= skb_peek(&sk
->sk_receive_queue
);
7854 refcount_inc(&skb
->users
);
7856 skb
= __skb_dequeue(&sk
->sk_receive_queue
);
7862 /* Caller is allowed not to check sk->sk_err before calling. */
7863 error
= sock_error(sk
);
7867 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7870 if (sk_can_busy_loop(sk
)) {
7871 sk_busy_loop(sk
, noblock
);
7873 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7877 /* User doesn't want to wait. */
7881 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
7890 /* If sndbuf has changed, wake up per association sndbuf waiters. */
7891 static void __sctp_write_space(struct sctp_association
*asoc
)
7893 struct sock
*sk
= asoc
->base
.sk
;
7895 if (sctp_wspace(asoc
) <= 0)
7898 if (waitqueue_active(&asoc
->wait
))
7899 wake_up_interruptible(&asoc
->wait
);
7901 if (sctp_writeable(sk
)) {
7902 struct socket_wq
*wq
;
7905 wq
= rcu_dereference(sk
->sk_wq
);
7907 if (waitqueue_active(&wq
->wait
))
7908 wake_up_interruptible(&wq
->wait
);
7910 /* Note that we try to include the Async I/O support
7911 * here by modeling from the current TCP/UDP code.
7912 * We have not tested with it yet.
7914 if (!(sk
->sk_shutdown
& SEND_SHUTDOWN
))
7915 sock_wake_async(wq
, SOCK_WAKE_SPACE
, POLL_OUT
);
7921 static void sctp_wake_up_waiters(struct sock
*sk
,
7922 struct sctp_association
*asoc
)
7924 struct sctp_association
*tmp
= asoc
;
7926 /* We do accounting for the sndbuf space per association,
7927 * so we only need to wake our own association.
7929 if (asoc
->ep
->sndbuf_policy
)
7930 return __sctp_write_space(asoc
);
7932 /* If association goes down and is just flushing its
7933 * outq, then just normally notify others.
7935 if (asoc
->base
.dead
)
7936 return sctp_write_space(sk
);
7938 /* Accounting for the sndbuf space is per socket, so we
7939 * need to wake up others, try to be fair and in case of
7940 * other associations, let them have a go first instead
7941 * of just doing a sctp_write_space() call.
7943 * Note that we reach sctp_wake_up_waiters() only when
7944 * associations free up queued chunks, thus we are under
7945 * lock and the list of associations on a socket is
7946 * guaranteed not to change.
7948 for (tmp
= list_next_entry(tmp
, asocs
); 1;
7949 tmp
= list_next_entry(tmp
, asocs
)) {
7950 /* Manually skip the head element. */
7951 if (&tmp
->asocs
== &((sctp_sk(sk
))->ep
->asocs
))
7953 /* Wake up association. */
7954 __sctp_write_space(tmp
);
7955 /* We've reached the end. */
7961 /* Do accounting for the sndbuf space.
7962 * Decrement the used sndbuf space of the corresponding association by the
7963 * data size which was just transmitted(freed).
7965 static void sctp_wfree(struct sk_buff
*skb
)
7967 struct sctp_chunk
*chunk
= skb_shinfo(skb
)->destructor_arg
;
7968 struct sctp_association
*asoc
= chunk
->asoc
;
7969 struct sock
*sk
= asoc
->base
.sk
;
7971 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
7972 sizeof(struct sk_buff
) +
7973 sizeof(struct sctp_chunk
);
7975 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
));
7978 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
7980 sk
->sk_wmem_queued
-= skb
->truesize
;
7981 sk_mem_uncharge(sk
, skb
->truesize
);
7984 sctp_wake_up_waiters(sk
, asoc
);
7986 sctp_association_put(asoc
);
7989 /* Do accounting for the receive space on the socket.
7990 * Accounting for the association is done in ulpevent.c
7991 * We set this as a destructor for the cloned data skbs so that
7992 * accounting is done at the correct time.
7994 void sctp_sock_rfree(struct sk_buff
*skb
)
7996 struct sock
*sk
= skb
->sk
;
7997 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
7999 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
8002 * Mimic the behavior of sock_rfree
8004 sk_mem_uncharge(sk
, event
->rmem_len
);
8008 /* Helper function to wait for space in the sndbuf. */
8009 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
8012 struct sock
*sk
= asoc
->base
.sk
;
8013 long current_timeo
= *timeo_p
;
8017 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__
, asoc
,
8020 /* Increment the association's refcnt. */
8021 sctp_association_hold(asoc
);
8023 /* Wait on the association specific sndbuf space. */
8025 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
8026 TASK_INTERRUPTIBLE
);
8027 if (asoc
->base
.dead
)
8031 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
)
8033 if (signal_pending(current
))
8034 goto do_interrupted
;
8035 if (sk_under_memory_pressure(sk
))
8037 if ((int)msg_len
<= sctp_wspace(asoc
) &&
8038 sk_wmem_schedule(sk
, msg_len
))
8041 /* Let another process have a go. Since we are going
8045 current_timeo
= schedule_timeout(current_timeo
);
8047 if (sk
!= asoc
->base
.sk
)
8050 *timeo_p
= current_timeo
;
8054 finish_wait(&asoc
->wait
, &wait
);
8056 /* Release the association's refcnt. */
8057 sctp_association_put(asoc
);
8070 err
= sock_intr_errno(*timeo_p
);
8078 void sctp_data_ready(struct sock
*sk
)
8080 struct socket_wq
*wq
;
8083 wq
= rcu_dereference(sk
->sk_wq
);
8084 if (skwq_has_sleeper(wq
))
8085 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
8086 POLLRDNORM
| POLLRDBAND
);
8087 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
8091 /* If socket sndbuf has changed, wake up all per association waiters. */
8092 void sctp_write_space(struct sock
*sk
)
8094 struct sctp_association
*asoc
;
8096 /* Wake up the tasks in each wait queue. */
8097 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
8098 __sctp_write_space(asoc
);
8102 /* Is there any sndbuf space available on the socket?
8104 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
8105 * associations on the same socket. For a UDP-style socket with
8106 * multiple associations, it is possible for it to be "unwriteable"
8107 * prematurely. I assume that this is acceptable because
8108 * a premature "unwriteable" is better than an accidental "writeable" which
8109 * would cause an unwanted block under certain circumstances. For the 1-1
8110 * UDP-style sockets or TCP-style sockets, this code should work.
8113 static bool sctp_writeable(struct sock
*sk
)
8115 return sk
->sk_sndbuf
> sk
->sk_wmem_queued
;
8118 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
8119 * returns immediately with EINPROGRESS.
8121 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
8123 struct sock
*sk
= asoc
->base
.sk
;
8125 long current_timeo
= *timeo_p
;
8128 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__
, asoc
, *timeo_p
);
8130 /* Increment the association's refcnt. */
8131 sctp_association_hold(asoc
);
8134 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
8135 TASK_INTERRUPTIBLE
);
8138 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
8140 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
8143 if (signal_pending(current
))
8144 goto do_interrupted
;
8146 if (sctp_state(asoc
, ESTABLISHED
))
8149 /* Let another process have a go. Since we are going
8153 current_timeo
= schedule_timeout(current_timeo
);
8156 *timeo_p
= current_timeo
;
8160 finish_wait(&asoc
->wait
, &wait
);
8162 /* Release the association's refcnt. */
8163 sctp_association_put(asoc
);
8168 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
8171 err
= -ECONNREFUSED
;
8175 err
= sock_intr_errno(*timeo_p
);
8183 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
8185 struct sctp_endpoint
*ep
;
8189 ep
= sctp_sk(sk
)->ep
;
8193 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
8194 TASK_INTERRUPTIBLE
);
8196 if (list_empty(&ep
->asocs
)) {
8198 timeo
= schedule_timeout(timeo
);
8203 if (!sctp_sstate(sk
, LISTENING
))
8207 if (!list_empty(&ep
->asocs
))
8210 err
= sock_intr_errno(timeo
);
8211 if (signal_pending(current
))
8219 finish_wait(sk_sleep(sk
), &wait
);
8224 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
8229 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
8230 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
8233 timeout
= schedule_timeout(timeout
);
8235 } while (!signal_pending(current
) && timeout
);
8237 finish_wait(sk_sleep(sk
), &wait
);
8240 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
8242 struct sk_buff
*frag
;
8247 /* Don't forget the fragments. */
8248 skb_walk_frags(skb
, frag
)
8249 sctp_skb_set_owner_r_frag(frag
, sk
);
8252 sctp_skb_set_owner_r(skb
, sk
);
8255 void sctp_copy_sock(struct sock
*newsk
, struct sock
*sk
,
8256 struct sctp_association
*asoc
)
8258 struct inet_sock
*inet
= inet_sk(sk
);
8259 struct inet_sock
*newinet
;
8261 newsk
->sk_type
= sk
->sk_type
;
8262 newsk
->sk_bound_dev_if
= sk
->sk_bound_dev_if
;
8263 newsk
->sk_flags
= sk
->sk_flags
;
8264 newsk
->sk_tsflags
= sk
->sk_tsflags
;
8265 newsk
->sk_no_check_tx
= sk
->sk_no_check_tx
;
8266 newsk
->sk_no_check_rx
= sk
->sk_no_check_rx
;
8267 newsk
->sk_reuse
= sk
->sk_reuse
;
8269 newsk
->sk_shutdown
= sk
->sk_shutdown
;
8270 newsk
->sk_destruct
= sctp_destruct_sock
;
8271 newsk
->sk_family
= sk
->sk_family
;
8272 newsk
->sk_protocol
= IPPROTO_SCTP
;
8273 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
8274 newsk
->sk_sndbuf
= sk
->sk_sndbuf
;
8275 newsk
->sk_rcvbuf
= sk
->sk_rcvbuf
;
8276 newsk
->sk_lingertime
= sk
->sk_lingertime
;
8277 newsk
->sk_rcvtimeo
= sk
->sk_rcvtimeo
;
8278 newsk
->sk_sndtimeo
= sk
->sk_sndtimeo
;
8279 newsk
->sk_rxhash
= sk
->sk_rxhash
;
8281 newinet
= inet_sk(newsk
);
8283 /* Initialize sk's sport, dport, rcv_saddr and daddr for
8284 * getsockname() and getpeername()
8286 newinet
->inet_sport
= inet
->inet_sport
;
8287 newinet
->inet_saddr
= inet
->inet_saddr
;
8288 newinet
->inet_rcv_saddr
= inet
->inet_rcv_saddr
;
8289 newinet
->inet_dport
= htons(asoc
->peer
.port
);
8290 newinet
->pmtudisc
= inet
->pmtudisc
;
8291 newinet
->inet_id
= asoc
->next_tsn
^ jiffies
;
8293 newinet
->uc_ttl
= inet
->uc_ttl
;
8294 newinet
->mc_loop
= 1;
8295 newinet
->mc_ttl
= 1;
8296 newinet
->mc_index
= 0;
8297 newinet
->mc_list
= NULL
;
8299 if (newsk
->sk_flags
& SK_FLAGS_TIMESTAMP
)
8300 net_enable_timestamp();
8302 security_sk_clone(sk
, newsk
);
8305 static inline void sctp_copy_descendant(struct sock
*sk_to
,
8306 const struct sock
*sk_from
)
8308 int ancestor_size
= sizeof(struct inet_sock
) +
8309 sizeof(struct sctp_sock
) -
8310 offsetof(struct sctp_sock
, auto_asconf_list
);
8312 if (sk_from
->sk_family
== PF_INET6
)
8313 ancestor_size
+= sizeof(struct ipv6_pinfo
);
8315 __inet_sk_copy_descendant(sk_to
, sk_from
, ancestor_size
);
8318 /* Populate the fields of the newsk from the oldsk and migrate the assoc
8319 * and its messages to the newsk.
8321 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
8322 struct sctp_association
*assoc
,
8323 enum sctp_socket_type type
)
8325 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
8326 struct sctp_sock
*newsp
= sctp_sk(newsk
);
8327 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
8328 struct sctp_endpoint
*newep
= newsp
->ep
;
8329 struct sk_buff
*skb
, *tmp
;
8330 struct sctp_ulpevent
*event
;
8331 struct sctp_bind_hashbucket
*head
;
8333 /* Migrate socket buffer sizes and all the socket level options to the
8336 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
8337 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
8338 /* Brute force copy old sctp opt. */
8339 sctp_copy_descendant(newsk
, oldsk
);
8341 /* Restore the ep value that was overwritten with the above structure
8347 /* Hook this new socket in to the bind_hash list. */
8348 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(oldsk
),
8349 inet_sk(oldsk
)->inet_num
)];
8350 spin_lock_bh(&head
->lock
);
8351 pp
= sctp_sk(oldsk
)->bind_hash
;
8352 sk_add_bind_node(newsk
, &pp
->owner
);
8353 sctp_sk(newsk
)->bind_hash
= pp
;
8354 inet_sk(newsk
)->inet_num
= inet_sk(oldsk
)->inet_num
;
8355 spin_unlock_bh(&head
->lock
);
8357 /* Copy the bind_addr list from the original endpoint to the new
8358 * endpoint so that we can handle restarts properly
8360 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
8361 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
8363 /* Move any messages in the old socket's receive queue that are for the
8364 * peeled off association to the new socket's receive queue.
8366 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
8367 event
= sctp_skb2event(skb
);
8368 if (event
->asoc
== assoc
) {
8369 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
8370 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
8371 sctp_skb_set_owner_r_frag(skb
, newsk
);
8375 /* Clean up any messages pending delivery due to partial
8376 * delivery. Three cases:
8377 * 1) No partial deliver; no work.
8378 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
8379 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
8381 skb_queue_head_init(&newsp
->pd_lobby
);
8382 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
8384 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
8385 struct sk_buff_head
*queue
;
8387 /* Decide which queue to move pd_lobby skbs to. */
8388 if (assoc
->ulpq
.pd_mode
) {
8389 queue
= &newsp
->pd_lobby
;
8391 queue
= &newsk
->sk_receive_queue
;
8393 /* Walk through the pd_lobby, looking for skbs that
8394 * need moved to the new socket.
8396 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
8397 event
= sctp_skb2event(skb
);
8398 if (event
->asoc
== assoc
) {
8399 __skb_unlink(skb
, &oldsp
->pd_lobby
);
8400 __skb_queue_tail(queue
, skb
);
8401 sctp_skb_set_owner_r_frag(skb
, newsk
);
8405 /* Clear up any skbs waiting for the partial
8406 * delivery to finish.
8408 if (assoc
->ulpq
.pd_mode
)
8409 sctp_clear_pd(oldsk
, NULL
);
8413 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
)
8414 sctp_skb_set_owner_r_frag(skb
, newsk
);
8416 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
)
8417 sctp_skb_set_owner_r_frag(skb
, newsk
);
8419 /* Set the type of socket to indicate that it is peeled off from the
8420 * original UDP-style socket or created with the accept() call on a
8421 * TCP-style socket..
8425 /* Mark the new socket "in-use" by the user so that any packets
8426 * that may arrive on the association after we've moved it are
8427 * queued to the backlog. This prevents a potential race between
8428 * backlog processing on the old socket and new-packet processing
8429 * on the new socket.
8431 * The caller has just allocated newsk so we can guarantee that other
8432 * paths won't try to lock it and then oldsk.
8434 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
8435 sctp_for_each_tx_datachunk(assoc
, sctp_clear_owner_w
);
8436 sctp_assoc_migrate(assoc
, newsk
);
8437 sctp_for_each_tx_datachunk(assoc
, sctp_set_owner_w
);
8439 /* If the association on the newsk is already closed before accept()
8440 * is called, set RCV_SHUTDOWN flag.
8442 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
)) {
8443 newsk
->sk_state
= SCTP_SS_CLOSED
;
8444 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
8446 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
8449 release_sock(newsk
);
8453 /* This proto struct describes the ULP interface for SCTP. */
8454 struct proto sctp_prot
= {
8456 .owner
= THIS_MODULE
,
8457 .close
= sctp_close
,
8458 .disconnect
= sctp_disconnect
,
8459 .accept
= sctp_accept
,
8460 .ioctl
= sctp_ioctl
,
8461 .init
= sctp_init_sock
,
8462 .destroy
= sctp_destroy_sock
,
8463 .shutdown
= sctp_shutdown
,
8464 .setsockopt
= sctp_setsockopt
,
8465 .getsockopt
= sctp_getsockopt
,
8466 .sendmsg
= sctp_sendmsg
,
8467 .recvmsg
= sctp_recvmsg
,
8469 .backlog_rcv
= sctp_backlog_rcv
,
8471 .unhash
= sctp_unhash
,
8472 .no_autobind
= true,
8473 .obj_size
= sizeof(struct sctp_sock
),
8474 .sysctl_mem
= sysctl_sctp_mem
,
8475 .sysctl_rmem
= sysctl_sctp_rmem
,
8476 .sysctl_wmem
= sysctl_sctp_wmem
,
8477 .memory_pressure
= &sctp_memory_pressure
,
8478 .enter_memory_pressure
= sctp_enter_memory_pressure
,
8479 .memory_allocated
= &sctp_memory_allocated
,
8480 .sockets_allocated
= &sctp_sockets_allocated
,
8483 #if IS_ENABLED(CONFIG_IPV6)
8485 #include <net/transp_v6.h>
8486 static void sctp_v6_destroy_sock(struct sock
*sk
)
8488 sctp_destroy_sock(sk
);
8489 inet6_destroy_sock(sk
);
8492 struct proto sctpv6_prot
= {
8494 .owner
= THIS_MODULE
,
8495 .close
= sctp_close
,
8496 .disconnect
= sctp_disconnect
,
8497 .accept
= sctp_accept
,
8498 .ioctl
= sctp_ioctl
,
8499 .init
= sctp_init_sock
,
8500 .destroy
= sctp_v6_destroy_sock
,
8501 .shutdown
= sctp_shutdown
,
8502 .setsockopt
= sctp_setsockopt
,
8503 .getsockopt
= sctp_getsockopt
,
8504 .sendmsg
= sctp_sendmsg
,
8505 .recvmsg
= sctp_recvmsg
,
8507 .backlog_rcv
= sctp_backlog_rcv
,
8509 .unhash
= sctp_unhash
,
8510 .no_autobind
= true,
8511 .obj_size
= sizeof(struct sctp6_sock
),
8512 .sysctl_mem
= sysctl_sctp_mem
,
8513 .sysctl_rmem
= sysctl_sctp_rmem
,
8514 .sysctl_wmem
= sysctl_sctp_wmem
,
8515 .memory_pressure
= &sctp_memory_pressure
,
8516 .enter_memory_pressure
= sctp_enter_memory_pressure
,
8517 .memory_allocated
= &sctp_memory_allocated
,
8518 .sockets_allocated
= &sctp_sockets_allocated
,
8520 #endif /* IS_ENABLED(CONFIG_IPV6) */