1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
18 * This SCTP implementation is free software;
19 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
24 * This SCTP implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, see
32 * <http://www.gnu.org/licenses/>.
34 * Please send any bug reports or fixes you make to the
36 * lksctp developers <linux-sctp@vger.kernel.org>
38 * Written or modified by:
39 * La Monte H.P. Yarroll <piggy@acm.org>
40 * Narasimha Budihal <narsi@refcode.org>
41 * Karl Knutson <karl@athena.chicago.il.us>
42 * Jon Grimm <jgrimm@us.ibm.com>
43 * Xingang Guo <xingang.guo@intel.com>
44 * Daisy Chang <daisyc@us.ibm.com>
45 * Sridhar Samudrala <samudrala@us.ibm.com>
46 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
47 * Ardelle Fan <ardelle.fan@intel.com>
48 * Ryan Layer <rmlayer@us.ibm.com>
49 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
50 * Kevin Gao <kevin.gao@intel.com>
53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
55 #include <crypto/hash.h>
56 #include <linux/types.h>
57 #include <linux/kernel.h>
58 #include <linux/wait.h>
59 #include <linux/time.h>
60 #include <linux/sched/signal.h>
62 #include <linux/capability.h>
63 #include <linux/fcntl.h>
64 #include <linux/poll.h>
65 #include <linux/init.h>
66 #include <linux/slab.h>
67 #include <linux/file.h>
68 #include <linux/compat.h>
72 #include <net/route.h>
74 #include <net/inet_common.h>
75 #include <net/busy_poll.h>
77 #include <linux/socket.h> /* for sa_family_t */
78 #include <linux/export.h>
80 #include <net/sctp/sctp.h>
81 #include <net/sctp/sm.h>
83 /* Forward declarations for internal helper functions. */
84 static int sctp_writeable(struct sock
*sk
);
85 static void sctp_wfree(struct sk_buff
*skb
);
86 static int sctp_wait_for_sndbuf(struct sctp_association
*, long *timeo_p
,
88 static int sctp_wait_for_packet(struct sock
*sk
, int *err
, long *timeo_p
);
89 static int sctp_wait_for_connect(struct sctp_association
*, long *timeo_p
);
90 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
);
91 static void sctp_wait_for_close(struct sock
*sk
, long timeo
);
92 static void sctp_destruct_sock(struct sock
*sk
);
93 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
94 union sctp_addr
*addr
, int len
);
95 static int sctp_bindx_add(struct sock
*, struct sockaddr
*, int);
96 static int sctp_bindx_rem(struct sock
*, struct sockaddr
*, int);
97 static int sctp_send_asconf_add_ip(struct sock
*, struct sockaddr
*, int);
98 static int sctp_send_asconf_del_ip(struct sock
*, struct sockaddr
*, int);
99 static int sctp_send_asconf(struct sctp_association
*asoc
,
100 struct sctp_chunk
*chunk
);
101 static int sctp_do_bind(struct sock
*, union sctp_addr
*, int);
102 static int sctp_autobind(struct sock
*sk
);
103 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
104 struct sctp_association
*assoc
,
105 enum sctp_socket_type type
);
107 static unsigned long sctp_memory_pressure
;
108 static atomic_long_t sctp_memory_allocated
;
109 struct percpu_counter sctp_sockets_allocated
;
111 static void sctp_enter_memory_pressure(struct sock
*sk
)
113 sctp_memory_pressure
= 1;
117 /* Get the sndbuf space available at the time on the association. */
118 static inline int sctp_wspace(struct sctp_association
*asoc
)
122 if (asoc
->ep
->sndbuf_policy
)
123 amt
= asoc
->sndbuf_used
;
125 amt
= sk_wmem_alloc_get(asoc
->base
.sk
);
127 if (amt
>= asoc
->base
.sk
->sk_sndbuf
) {
128 if (asoc
->base
.sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)
131 amt
= sk_stream_wspace(asoc
->base
.sk
);
136 amt
= asoc
->base
.sk
->sk_sndbuf
- amt
;
141 /* Increment the used sndbuf space count of the corresponding association by
142 * the size of the outgoing data chunk.
143 * Also, set the skb destructor for sndbuf accounting later.
145 * Since it is always 1-1 between chunk and skb, and also a new skb is always
146 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
147 * destructor in the data chunk skb for the purpose of the sndbuf space
150 static inline void sctp_set_owner_w(struct sctp_chunk
*chunk
)
152 struct sctp_association
*asoc
= chunk
->asoc
;
153 struct sock
*sk
= asoc
->base
.sk
;
155 /* The sndbuf space is tracked per association. */
156 sctp_association_hold(asoc
);
158 skb_set_owner_w(chunk
->skb
, sk
);
160 chunk
->skb
->destructor
= sctp_wfree
;
161 /* Save the chunk pointer in skb for sctp_wfree to use later. */
162 skb_shinfo(chunk
->skb
)->destructor_arg
= chunk
;
164 asoc
->sndbuf_used
+= SCTP_DATA_SNDSIZE(chunk
) +
165 sizeof(struct sk_buff
) +
166 sizeof(struct sctp_chunk
);
168 refcount_add(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
);
169 sk
->sk_wmem_queued
+= chunk
->skb
->truesize
;
170 sk_mem_charge(sk
, chunk
->skb
->truesize
);
173 /* Verify that this is a valid address. */
174 static inline int sctp_verify_addr(struct sock
*sk
, union sctp_addr
*addr
,
179 /* Verify basic sockaddr. */
180 af
= sctp_sockaddr_af(sctp_sk(sk
), addr
, len
);
184 /* Is this a valid SCTP address? */
185 if (!af
->addr_valid(addr
, sctp_sk(sk
), NULL
))
188 if (!sctp_sk(sk
)->pf
->send_verify(sctp_sk(sk
), (addr
)))
194 /* Look up the association by its id. If this is not a UDP-style
195 * socket, the ID field is always ignored.
197 struct sctp_association
*sctp_id2assoc(struct sock
*sk
, sctp_assoc_t id
)
199 struct sctp_association
*asoc
= NULL
;
201 /* If this is not a UDP-style socket, assoc id should be ignored. */
202 if (!sctp_style(sk
, UDP
)) {
203 /* Return NULL if the socket state is not ESTABLISHED. It
204 * could be a TCP-style listening socket or a socket which
205 * hasn't yet called connect() to establish an association.
207 if (!sctp_sstate(sk
, ESTABLISHED
) && !sctp_sstate(sk
, CLOSING
))
210 /* Get the first and the only association from the list. */
211 if (!list_empty(&sctp_sk(sk
)->ep
->asocs
))
212 asoc
= list_entry(sctp_sk(sk
)->ep
->asocs
.next
,
213 struct sctp_association
, asocs
);
217 /* Otherwise this is a UDP-style socket. */
218 if (!id
|| (id
== (sctp_assoc_t
)-1))
221 spin_lock_bh(&sctp_assocs_id_lock
);
222 asoc
= (struct sctp_association
*)idr_find(&sctp_assocs_id
, (int)id
);
223 spin_unlock_bh(&sctp_assocs_id_lock
);
225 if (!asoc
|| (asoc
->base
.sk
!= sk
) || asoc
->base
.dead
)
231 /* Look up the transport from an address and an assoc id. If both address and
232 * id are specified, the associations matching the address and the id should be
235 static struct sctp_transport
*sctp_addr_id2transport(struct sock
*sk
,
236 struct sockaddr_storage
*addr
,
239 struct sctp_association
*addr_asoc
= NULL
, *id_asoc
= NULL
;
240 struct sctp_af
*af
= sctp_get_af_specific(addr
->ss_family
);
241 union sctp_addr
*laddr
= (union sctp_addr
*)addr
;
242 struct sctp_transport
*transport
;
244 if (!af
|| sctp_verify_addr(sk
, laddr
, af
->sockaddr_len
))
247 addr_asoc
= sctp_endpoint_lookup_assoc(sctp_sk(sk
)->ep
,
254 id_asoc
= sctp_id2assoc(sk
, id
);
255 if (id_asoc
&& (id_asoc
!= addr_asoc
))
258 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sctp_sk(sk
),
259 (union sctp_addr
*)addr
);
264 /* API 3.1.2 bind() - UDP Style Syntax
265 * The syntax of bind() is,
267 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
269 * sd - the socket descriptor returned by socket().
270 * addr - the address structure (struct sockaddr_in or struct
271 * sockaddr_in6 [RFC 2553]),
272 * addr_len - the size of the address structure.
274 static int sctp_bind(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
)
280 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__
, sk
,
283 /* Disallow binding twice. */
284 if (!sctp_sk(sk
)->ep
->base
.bind_addr
.port
)
285 retval
= sctp_do_bind(sk
, (union sctp_addr
*)addr
,
295 static long sctp_get_port_local(struct sock
*, union sctp_addr
*);
297 /* Verify this is a valid sockaddr. */
298 static struct sctp_af
*sctp_sockaddr_af(struct sctp_sock
*opt
,
299 union sctp_addr
*addr
, int len
)
303 /* Check minimum size. */
304 if (len
< sizeof (struct sockaddr
))
307 /* V4 mapped address are really of AF_INET family */
308 if (addr
->sa
.sa_family
== AF_INET6
&&
309 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
)) {
310 if (!opt
->pf
->af_supported(AF_INET
, opt
))
313 /* Does this PF support this AF? */
314 if (!opt
->pf
->af_supported(addr
->sa
.sa_family
, opt
))
318 /* If we get this far, af is valid. */
319 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
321 if (len
< af
->sockaddr_len
)
327 /* Bind a local address either to an endpoint or to an association. */
328 static int sctp_do_bind(struct sock
*sk
, union sctp_addr
*addr
, int len
)
330 struct net
*net
= sock_net(sk
);
331 struct sctp_sock
*sp
= sctp_sk(sk
);
332 struct sctp_endpoint
*ep
= sp
->ep
;
333 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
338 /* Common sockaddr verification. */
339 af
= sctp_sockaddr_af(sp
, addr
, len
);
341 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
342 __func__
, sk
, addr
, len
);
346 snum
= ntohs(addr
->v4
.sin_port
);
348 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
349 __func__
, sk
, &addr
->sa
, bp
->port
, snum
, len
);
351 /* PF specific bind() address verification. */
352 if (!sp
->pf
->bind_verify(sp
, addr
))
353 return -EADDRNOTAVAIL
;
355 /* We must either be unbound, or bind to the same port.
356 * It's OK to allow 0 ports if we are already bound.
357 * We'll just inhert an already bound port in this case
362 else if (snum
!= bp
->port
) {
363 pr_debug("%s: new port %d doesn't match existing port "
364 "%d\n", __func__
, snum
, bp
->port
);
369 if (snum
&& snum
< inet_prot_sock(net
) &&
370 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
))
373 /* See if the address matches any of the addresses we may have
374 * already bound before checking against other endpoints.
376 if (sctp_bind_addr_match(bp
, addr
, sp
))
379 /* Make sure we are allowed to bind here.
380 * The function sctp_get_port_local() does duplicate address
383 addr
->v4
.sin_port
= htons(snum
);
384 if ((ret
= sctp_get_port_local(sk
, addr
))) {
388 /* Refresh ephemeral port. */
390 bp
->port
= inet_sk(sk
)->inet_num
;
392 /* Add the address to the bind address list.
393 * Use GFP_ATOMIC since BHs will be disabled.
395 ret
= sctp_add_bind_addr(bp
, addr
, af
->sockaddr_len
,
396 SCTP_ADDR_SRC
, GFP_ATOMIC
);
398 /* Copy back into socket for getsockname() use. */
400 inet_sk(sk
)->inet_sport
= htons(inet_sk(sk
)->inet_num
);
401 sp
->pf
->to_sk_saddr(addr
, sk
);
407 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
409 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
410 * at any one time. If a sender, after sending an ASCONF chunk, decides
411 * it needs to transfer another ASCONF Chunk, it MUST wait until the
412 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
413 * subsequent ASCONF. Note this restriction binds each side, so at any
414 * time two ASCONF may be in-transit on any given association (one sent
415 * from each endpoint).
417 static int sctp_send_asconf(struct sctp_association
*asoc
,
418 struct sctp_chunk
*chunk
)
420 struct net
*net
= sock_net(asoc
->base
.sk
);
423 /* If there is an outstanding ASCONF chunk, queue it for later
426 if (asoc
->addip_last_asconf
) {
427 list_add_tail(&chunk
->list
, &asoc
->addip_chunk_list
);
431 /* Hold the chunk until an ASCONF_ACK is received. */
432 sctp_chunk_hold(chunk
);
433 retval
= sctp_primitive_ASCONF(net
, asoc
, chunk
);
435 sctp_chunk_free(chunk
);
437 asoc
->addip_last_asconf
= chunk
;
443 /* Add a list of addresses as bind addresses to local endpoint or
446 * Basically run through each address specified in the addrs/addrcnt
447 * array/length pair, determine if it is IPv6 or IPv4 and call
448 * sctp_do_bind() on it.
450 * If any of them fails, then the operation will be reversed and the
451 * ones that were added will be removed.
453 * Only sctp_setsockopt_bindx() is supposed to call this function.
455 static int sctp_bindx_add(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
460 struct sockaddr
*sa_addr
;
463 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__
, sk
,
467 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
468 /* The list may contain either IPv4 or IPv6 address;
469 * determine the address length for walking thru the list.
472 af
= sctp_get_af_specific(sa_addr
->sa_family
);
478 retval
= sctp_do_bind(sk
, (union sctp_addr
*)sa_addr
,
481 addr_buf
+= af
->sockaddr_len
;
485 /* Failed. Cleanup the ones that have been added */
487 sctp_bindx_rem(sk
, addrs
, cnt
);
495 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
496 * associations that are part of the endpoint indicating that a list of local
497 * addresses are added to the endpoint.
499 * If any of the addresses is already in the bind address list of the
500 * association, we do not send the chunk for that association. But it will not
501 * affect other associations.
503 * Only sctp_setsockopt_bindx() is supposed to call this function.
505 static int sctp_send_asconf_add_ip(struct sock
*sk
,
506 struct sockaddr
*addrs
,
509 struct net
*net
= sock_net(sk
);
510 struct sctp_sock
*sp
;
511 struct sctp_endpoint
*ep
;
512 struct sctp_association
*asoc
;
513 struct sctp_bind_addr
*bp
;
514 struct sctp_chunk
*chunk
;
515 struct sctp_sockaddr_entry
*laddr
;
516 union sctp_addr
*addr
;
517 union sctp_addr saveaddr
;
524 if (!net
->sctp
.addip_enable
)
530 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
531 __func__
, sk
, addrs
, addrcnt
);
533 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
534 if (!asoc
->peer
.asconf_capable
)
537 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_ADD_IP
)
540 if (!sctp_state(asoc
, ESTABLISHED
))
543 /* Check if any address in the packed array of addresses is
544 * in the bind address list of the association. If so,
545 * do not send the asconf chunk to its peer, but continue with
546 * other associations.
549 for (i
= 0; i
< addrcnt
; i
++) {
551 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
557 if (sctp_assoc_lookup_laddr(asoc
, addr
))
560 addr_buf
+= af
->sockaddr_len
;
565 /* Use the first valid address in bind addr list of
566 * association as Address Parameter of ASCONF CHUNK.
568 bp
= &asoc
->base
.bind_addr
;
569 p
= bp
->address_list
.next
;
570 laddr
= list_entry(p
, struct sctp_sockaddr_entry
, list
);
571 chunk
= sctp_make_asconf_update_ip(asoc
, &laddr
->a
, addrs
,
572 addrcnt
, SCTP_PARAM_ADD_IP
);
578 /* Add the new addresses to the bind address list with
579 * use_as_src set to 0.
582 for (i
= 0; i
< addrcnt
; i
++) {
584 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
585 memcpy(&saveaddr
, addr
, af
->sockaddr_len
);
586 retval
= sctp_add_bind_addr(bp
, &saveaddr
,
588 SCTP_ADDR_NEW
, GFP_ATOMIC
);
589 addr_buf
+= af
->sockaddr_len
;
591 if (asoc
->src_out_of_asoc_ok
) {
592 struct sctp_transport
*trans
;
594 list_for_each_entry(trans
,
595 &asoc
->peer
.transport_addr_list
, transports
) {
596 /* Clear the source and route cache */
597 sctp_transport_dst_release(trans
);
598 trans
->cwnd
= min(4*asoc
->pathmtu
, max_t(__u32
,
599 2*asoc
->pathmtu
, 4380));
600 trans
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
601 trans
->rto
= asoc
->rto_initial
;
602 sctp_max_rto(asoc
, trans
);
603 trans
->rtt
= trans
->srtt
= trans
->rttvar
= 0;
604 sctp_transport_route(trans
, NULL
,
605 sctp_sk(asoc
->base
.sk
));
608 retval
= sctp_send_asconf(asoc
, chunk
);
615 /* Remove a list of addresses from bind addresses list. Do not remove the
618 * Basically run through each address specified in the addrs/addrcnt
619 * array/length pair, determine if it is IPv6 or IPv4 and call
620 * sctp_del_bind() on it.
622 * If any of them fails, then the operation will be reversed and the
623 * ones that were removed will be added back.
625 * At least one address has to be left; if only one address is
626 * available, the operation will return -EBUSY.
628 * Only sctp_setsockopt_bindx() is supposed to call this function.
630 static int sctp_bindx_rem(struct sock
*sk
, struct sockaddr
*addrs
, int addrcnt
)
632 struct sctp_sock
*sp
= sctp_sk(sk
);
633 struct sctp_endpoint
*ep
= sp
->ep
;
635 struct sctp_bind_addr
*bp
= &ep
->base
.bind_addr
;
638 union sctp_addr
*sa_addr
;
641 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
642 __func__
, sk
, addrs
, addrcnt
);
645 for (cnt
= 0; cnt
< addrcnt
; cnt
++) {
646 /* If the bind address list is empty or if there is only one
647 * bind address, there is nothing more to be removed (we need
648 * at least one address here).
650 if (list_empty(&bp
->address_list
) ||
651 (sctp_list_single_entry(&bp
->address_list
))) {
657 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
663 if (!af
->addr_valid(sa_addr
, sp
, NULL
)) {
664 retval
= -EADDRNOTAVAIL
;
668 if (sa_addr
->v4
.sin_port
&&
669 sa_addr
->v4
.sin_port
!= htons(bp
->port
)) {
674 if (!sa_addr
->v4
.sin_port
)
675 sa_addr
->v4
.sin_port
= htons(bp
->port
);
677 /* FIXME - There is probably a need to check if sk->sk_saddr and
678 * sk->sk_rcv_addr are currently set to one of the addresses to
679 * be removed. This is something which needs to be looked into
680 * when we are fixing the outstanding issues with multi-homing
681 * socket routing and failover schemes. Refer to comments in
682 * sctp_do_bind(). -daisy
684 retval
= sctp_del_bind_addr(bp
, sa_addr
);
686 addr_buf
+= af
->sockaddr_len
;
689 /* Failed. Add the ones that has been removed back */
691 sctp_bindx_add(sk
, addrs
, cnt
);
699 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
700 * the associations that are part of the endpoint indicating that a list of
701 * local addresses are removed from the endpoint.
703 * If any of the addresses is already in the bind address list of the
704 * association, we do not send the chunk for that association. But it will not
705 * affect other associations.
707 * Only sctp_setsockopt_bindx() is supposed to call this function.
709 static int sctp_send_asconf_del_ip(struct sock
*sk
,
710 struct sockaddr
*addrs
,
713 struct net
*net
= sock_net(sk
);
714 struct sctp_sock
*sp
;
715 struct sctp_endpoint
*ep
;
716 struct sctp_association
*asoc
;
717 struct sctp_transport
*transport
;
718 struct sctp_bind_addr
*bp
;
719 struct sctp_chunk
*chunk
;
720 union sctp_addr
*laddr
;
723 struct sctp_sockaddr_entry
*saddr
;
729 if (!net
->sctp
.addip_enable
)
735 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
736 __func__
, sk
, addrs
, addrcnt
);
738 list_for_each_entry(asoc
, &ep
->asocs
, asocs
) {
740 if (!asoc
->peer
.asconf_capable
)
743 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_DEL_IP
)
746 if (!sctp_state(asoc
, ESTABLISHED
))
749 /* Check if any address in the packed array of addresses is
750 * not present in the bind address list of the association.
751 * If so, do not send the asconf chunk to its peer, but
752 * continue with other associations.
755 for (i
= 0; i
< addrcnt
; i
++) {
757 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
763 if (!sctp_assoc_lookup_laddr(asoc
, laddr
))
766 addr_buf
+= af
->sockaddr_len
;
771 /* Find one address in the association's bind address list
772 * that is not in the packed array of addresses. This is to
773 * make sure that we do not delete all the addresses in the
776 bp
= &asoc
->base
.bind_addr
;
777 laddr
= sctp_find_unmatch_addr(bp
, (union sctp_addr
*)addrs
,
779 if ((laddr
== NULL
) && (addrcnt
== 1)) {
780 if (asoc
->asconf_addr_del_pending
)
782 asoc
->asconf_addr_del_pending
=
783 kzalloc(sizeof(union sctp_addr
), GFP_ATOMIC
);
784 if (asoc
->asconf_addr_del_pending
== NULL
) {
788 asoc
->asconf_addr_del_pending
->sa
.sa_family
=
790 asoc
->asconf_addr_del_pending
->v4
.sin_port
=
792 if (addrs
->sa_family
== AF_INET
) {
793 struct sockaddr_in
*sin
;
795 sin
= (struct sockaddr_in
*)addrs
;
796 asoc
->asconf_addr_del_pending
->v4
.sin_addr
.s_addr
= sin
->sin_addr
.s_addr
;
797 } else if (addrs
->sa_family
== AF_INET6
) {
798 struct sockaddr_in6
*sin6
;
800 sin6
= (struct sockaddr_in6
*)addrs
;
801 asoc
->asconf_addr_del_pending
->v6
.sin6_addr
= sin6
->sin6_addr
;
804 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
805 __func__
, asoc
, &asoc
->asconf_addr_del_pending
->sa
,
806 asoc
->asconf_addr_del_pending
);
808 asoc
->src_out_of_asoc_ok
= 1;
816 /* We do not need RCU protection throughout this loop
817 * because this is done under a socket lock from the
820 chunk
= sctp_make_asconf_update_ip(asoc
, laddr
, addrs
, addrcnt
,
828 /* Reset use_as_src flag for the addresses in the bind address
829 * list that are to be deleted.
832 for (i
= 0; i
< addrcnt
; i
++) {
834 af
= sctp_get_af_specific(laddr
->v4
.sin_family
);
835 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
836 if (sctp_cmp_addr_exact(&saddr
->a
, laddr
))
837 saddr
->state
= SCTP_ADDR_DEL
;
839 addr_buf
+= af
->sockaddr_len
;
842 /* Update the route and saddr entries for all the transports
843 * as some of the addresses in the bind address list are
844 * about to be deleted and cannot be used as source addresses.
846 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
848 sctp_transport_dst_release(transport
);
849 sctp_transport_route(transport
, NULL
,
850 sctp_sk(asoc
->base
.sk
));
854 /* We don't need to transmit ASCONF */
856 retval
= sctp_send_asconf(asoc
, chunk
);
862 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
863 int sctp_asconf_mgmt(struct sctp_sock
*sp
, struct sctp_sockaddr_entry
*addrw
)
865 struct sock
*sk
= sctp_opt2sk(sp
);
866 union sctp_addr
*addr
;
869 /* It is safe to write port space in caller. */
871 addr
->v4
.sin_port
= htons(sp
->ep
->base
.bind_addr
.port
);
872 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
875 if (sctp_verify_addr(sk
, addr
, af
->sockaddr_len
))
878 if (addrw
->state
== SCTP_ADDR_NEW
)
879 return sctp_send_asconf_add_ip(sk
, (struct sockaddr
*)addr
, 1);
881 return sctp_send_asconf_del_ip(sk
, (struct sockaddr
*)addr
, 1);
884 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
887 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
890 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
891 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
894 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
895 * Section 3.1.2 for this usage.
897 * addrs is a pointer to an array of one or more socket addresses. Each
898 * address is contained in its appropriate structure (i.e. struct
899 * sockaddr_in or struct sockaddr_in6) the family of the address type
900 * must be used to distinguish the address length (note that this
901 * representation is termed a "packed array" of addresses). The caller
902 * specifies the number of addresses in the array with addrcnt.
904 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
905 * -1, and sets errno to the appropriate error code.
907 * For SCTP, the port given in each socket address must be the same, or
908 * sctp_bindx() will fail, setting errno to EINVAL.
910 * The flags parameter is formed from the bitwise OR of zero or more of
911 * the following currently defined flags:
913 * SCTP_BINDX_ADD_ADDR
915 * SCTP_BINDX_REM_ADDR
917 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
918 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
919 * addresses from the association. The two flags are mutually exclusive;
920 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
921 * not remove all addresses from an association; sctp_bindx() will
922 * reject such an attempt with EINVAL.
924 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
925 * additional addresses with an endpoint after calling bind(). Or use
926 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
927 * socket is associated with so that no new association accepted will be
928 * associated with those addresses. If the endpoint supports dynamic
929 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
930 * endpoint to send the appropriate message to the peer to change the
931 * peers address lists.
933 * Adding and removing addresses from a connected association is
934 * optional functionality. Implementations that do not support this
935 * functionality should return EOPNOTSUPP.
937 * Basically do nothing but copying the addresses from user to kernel
938 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
939 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
942 * We don't use copy_from_user() for optimization: we first do the
943 * sanity checks (buffer size -fast- and access check-healthy
944 * pointer); if all of those succeed, then we can alloc the memory
945 * (expensive operation) needed to copy the data to kernel. Then we do
946 * the copying without checking the user space area
947 * (__copy_from_user()).
949 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
952 * sk The sk of the socket
953 * addrs The pointer to the addresses in user land
954 * addrssize Size of the addrs buffer
955 * op Operation to perform (add or remove, see the flags of
958 * Returns 0 if ok, <0 errno code on error.
960 static int sctp_setsockopt_bindx(struct sock
*sk
,
961 struct sockaddr __user
*addrs
,
962 int addrs_size
, int op
)
964 struct sockaddr
*kaddrs
;
968 struct sockaddr
*sa_addr
;
972 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
973 __func__
, sk
, addrs
, addrs_size
, op
);
975 if (unlikely(addrs_size
<= 0))
978 /* Check the user passed a healthy pointer. */
979 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
982 /* Alloc space for the address array in kernel memory. */
983 kaddrs
= kmalloc(addrs_size
, GFP_USER
| __GFP_NOWARN
);
984 if (unlikely(!kaddrs
))
987 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
992 /* Walk through the addrs buffer and count the number of addresses. */
994 while (walk_size
< addrs_size
) {
995 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1001 af
= sctp_get_af_specific(sa_addr
->sa_family
);
1003 /* If the address family is not supported or if this address
1004 * causes the address buffer to overflow return EINVAL.
1006 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1011 addr_buf
+= af
->sockaddr_len
;
1012 walk_size
+= af
->sockaddr_len
;
1017 case SCTP_BINDX_ADD_ADDR
:
1018 err
= sctp_bindx_add(sk
, kaddrs
, addrcnt
);
1021 err
= sctp_send_asconf_add_ip(sk
, kaddrs
, addrcnt
);
1024 case SCTP_BINDX_REM_ADDR
:
1025 err
= sctp_bindx_rem(sk
, kaddrs
, addrcnt
);
1028 err
= sctp_send_asconf_del_ip(sk
, kaddrs
, addrcnt
);
1042 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1044 * Common routine for handling connect() and sctp_connectx().
1045 * Connect will come in with just a single address.
1047 static int __sctp_connect(struct sock
*sk
,
1048 struct sockaddr
*kaddrs
,
1050 sctp_assoc_t
*assoc_id
)
1052 struct net
*net
= sock_net(sk
);
1053 struct sctp_sock
*sp
;
1054 struct sctp_endpoint
*ep
;
1055 struct sctp_association
*asoc
= NULL
;
1056 struct sctp_association
*asoc2
;
1057 struct sctp_transport
*transport
;
1059 enum sctp_scope scope
;
1064 union sctp_addr
*sa_addr
= NULL
;
1066 unsigned short port
;
1067 unsigned int f_flags
= 0;
1072 /* connect() cannot be done on a socket that is already in ESTABLISHED
1073 * state - UDP-style peeled off socket or a TCP-style socket that
1074 * is already connected.
1075 * It cannot be done even on a TCP-style listening socket.
1077 if (sctp_sstate(sk
, ESTABLISHED
) || sctp_sstate(sk
, CLOSING
) ||
1078 (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))) {
1083 /* Walk through the addrs buffer and count the number of addresses. */
1085 while (walk_size
< addrs_size
) {
1088 if (walk_size
+ sizeof(sa_family_t
) > addrs_size
) {
1094 af
= sctp_get_af_specific(sa_addr
->sa
.sa_family
);
1096 /* If the address family is not supported or if this address
1097 * causes the address buffer to overflow return EINVAL.
1099 if (!af
|| (walk_size
+ af
->sockaddr_len
) > addrs_size
) {
1104 port
= ntohs(sa_addr
->v4
.sin_port
);
1106 /* Save current address so we can work with it */
1107 memcpy(&to
, sa_addr
, af
->sockaddr_len
);
1109 err
= sctp_verify_addr(sk
, &to
, af
->sockaddr_len
);
1113 /* Make sure the destination port is correctly set
1116 if (asoc
&& asoc
->peer
.port
&& asoc
->peer
.port
!= port
) {
1121 /* Check if there already is a matching association on the
1122 * endpoint (other than the one created here).
1124 asoc2
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1125 if (asoc2
&& asoc2
!= asoc
) {
1126 if (asoc2
->state
>= SCTP_STATE_ESTABLISHED
)
1133 /* If we could not find a matching association on the endpoint,
1134 * make sure that there is no peeled-off association matching
1135 * the peer address even on another socket.
1137 if (sctp_endpoint_is_peeled_off(ep
, &to
)) {
1138 err
= -EADDRNOTAVAIL
;
1143 /* If a bind() or sctp_bindx() is not called prior to
1144 * an sctp_connectx() call, the system picks an
1145 * ephemeral port and will choose an address set
1146 * equivalent to binding with a wildcard address.
1148 if (!ep
->base
.bind_addr
.port
) {
1149 if (sctp_autobind(sk
)) {
1155 * If an unprivileged user inherits a 1-many
1156 * style socket with open associations on a
1157 * privileged port, it MAY be permitted to
1158 * accept new associations, but it SHOULD NOT
1159 * be permitted to open new associations.
1161 if (ep
->base
.bind_addr
.port
<
1162 inet_prot_sock(net
) &&
1163 !ns_capable(net
->user_ns
,
1164 CAP_NET_BIND_SERVICE
)) {
1170 scope
= sctp_scope(&to
);
1171 asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1177 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
,
1185 /* Prime the peer's transport structures. */
1186 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
,
1194 addr_buf
+= af
->sockaddr_len
;
1195 walk_size
+= af
->sockaddr_len
;
1198 /* In case the user of sctp_connectx() wants an association
1199 * id back, assign one now.
1202 err
= sctp_assoc_set_id(asoc
, GFP_KERNEL
);
1207 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1212 /* Initialize sk's dport and daddr for getpeername() */
1213 inet_sk(sk
)->inet_dport
= htons(asoc
->peer
.port
);
1214 sp
->pf
->to_sk_daddr(sa_addr
, sk
);
1217 /* in-kernel sockets don't generally have a file allocated to them
1218 * if all they do is call sock_create_kern().
1220 if (sk
->sk_socket
->file
)
1221 f_flags
= sk
->sk_socket
->file
->f_flags
;
1223 timeo
= sock_sndtimeo(sk
, f_flags
& O_NONBLOCK
);
1226 *assoc_id
= asoc
->assoc_id
;
1227 err
= sctp_wait_for_connect(asoc
, &timeo
);
1228 /* Note: the asoc may be freed after the return of
1229 * sctp_wait_for_connect.
1232 /* Don't free association on exit. */
1236 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1237 __func__
, asoc
, kaddrs
, err
);
1240 /* sctp_primitive_ASSOCIATE may have added this association
1241 * To the hash table, try to unhash it, just in case, its a noop
1242 * if it wasn't hashed so we're safe
1244 sctp_association_free(asoc
);
1249 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1252 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1253 * sctp_assoc_t *asoc);
1255 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1256 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1257 * or IPv6 addresses.
1259 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1260 * Section 3.1.2 for this usage.
1262 * addrs is a pointer to an array of one or more socket addresses. Each
1263 * address is contained in its appropriate structure (i.e. struct
1264 * sockaddr_in or struct sockaddr_in6) the family of the address type
1265 * must be used to distengish the address length (note that this
1266 * representation is termed a "packed array" of addresses). The caller
1267 * specifies the number of addresses in the array with addrcnt.
1269 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1270 * the association id of the new association. On failure, sctp_connectx()
1271 * returns -1, and sets errno to the appropriate error code. The assoc_id
1272 * is not touched by the kernel.
1274 * For SCTP, the port given in each socket address must be the same, or
1275 * sctp_connectx() will fail, setting errno to EINVAL.
1277 * An application can use sctp_connectx to initiate an association with
1278 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1279 * allows a caller to specify multiple addresses at which a peer can be
1280 * reached. The way the SCTP stack uses the list of addresses to set up
1281 * the association is implementation dependent. This function only
1282 * specifies that the stack will try to make use of all the addresses in
1283 * the list when needed.
1285 * Note that the list of addresses passed in is only used for setting up
1286 * the association. It does not necessarily equal the set of addresses
1287 * the peer uses for the resulting association. If the caller wants to
1288 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1289 * retrieve them after the association has been set up.
1291 * Basically do nothing but copying the addresses from user to kernel
1292 * land and invoking either sctp_connectx(). This is used for tunneling
1293 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1295 * We don't use copy_from_user() for optimization: we first do the
1296 * sanity checks (buffer size -fast- and access check-healthy
1297 * pointer); if all of those succeed, then we can alloc the memory
1298 * (expensive operation) needed to copy the data to kernel. Then we do
1299 * the copying without checking the user space area
1300 * (__copy_from_user()).
1302 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1305 * sk The sk of the socket
1306 * addrs The pointer to the addresses in user land
1307 * addrssize Size of the addrs buffer
1309 * Returns >=0 if ok, <0 errno code on error.
1311 static int __sctp_setsockopt_connectx(struct sock
*sk
,
1312 struct sockaddr __user
*addrs
,
1314 sctp_assoc_t
*assoc_id
)
1316 struct sockaddr
*kaddrs
;
1317 gfp_t gfp
= GFP_KERNEL
;
1320 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1321 __func__
, sk
, addrs
, addrs_size
);
1323 if (unlikely(addrs_size
<= 0))
1326 /* Check the user passed a healthy pointer. */
1327 if (unlikely(!access_ok(VERIFY_READ
, addrs
, addrs_size
)))
1330 /* Alloc space for the address array in kernel memory. */
1331 if (sk
->sk_socket
->file
)
1332 gfp
= GFP_USER
| __GFP_NOWARN
;
1333 kaddrs
= kmalloc(addrs_size
, gfp
);
1334 if (unlikely(!kaddrs
))
1337 if (__copy_from_user(kaddrs
, addrs
, addrs_size
)) {
1340 err
= __sctp_connect(sk
, kaddrs
, addrs_size
, assoc_id
);
1349 * This is an older interface. It's kept for backward compatibility
1350 * to the option that doesn't provide association id.
1352 static int sctp_setsockopt_connectx_old(struct sock
*sk
,
1353 struct sockaddr __user
*addrs
,
1356 return __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, NULL
);
1360 * New interface for the API. The since the API is done with a socket
1361 * option, to make it simple we feed back the association id is as a return
1362 * indication to the call. Error is always negative and association id is
1365 static int sctp_setsockopt_connectx(struct sock
*sk
,
1366 struct sockaddr __user
*addrs
,
1369 sctp_assoc_t assoc_id
= 0;
1372 err
= __sctp_setsockopt_connectx(sk
, addrs
, addrs_size
, &assoc_id
);
1381 * New (hopefully final) interface for the API.
1382 * We use the sctp_getaddrs_old structure so that use-space library
1383 * can avoid any unnecessary allocations. The only different part
1384 * is that we store the actual length of the address buffer into the
1385 * addrs_num structure member. That way we can re-use the existing
1388 #ifdef CONFIG_COMPAT
1389 struct compat_sctp_getaddrs_old
{
1390 sctp_assoc_t assoc_id
;
1392 compat_uptr_t addrs
; /* struct sockaddr * */
1396 static int sctp_getsockopt_connectx3(struct sock
*sk
, int len
,
1397 char __user
*optval
,
1400 struct sctp_getaddrs_old param
;
1401 sctp_assoc_t assoc_id
= 0;
1404 #ifdef CONFIG_COMPAT
1405 if (in_compat_syscall()) {
1406 struct compat_sctp_getaddrs_old param32
;
1408 if (len
< sizeof(param32
))
1410 if (copy_from_user(¶m32
, optval
, sizeof(param32
)))
1413 param
.assoc_id
= param32
.assoc_id
;
1414 param
.addr_num
= param32
.addr_num
;
1415 param
.addrs
= compat_ptr(param32
.addrs
);
1419 if (len
< sizeof(param
))
1421 if (copy_from_user(¶m
, optval
, sizeof(param
)))
1425 err
= __sctp_setsockopt_connectx(sk
, (struct sockaddr __user
*)
1426 param
.addrs
, param
.addr_num
,
1428 if (err
== 0 || err
== -EINPROGRESS
) {
1429 if (copy_to_user(optval
, &assoc_id
, sizeof(assoc_id
)))
1431 if (put_user(sizeof(assoc_id
), optlen
))
1438 /* API 3.1.4 close() - UDP Style Syntax
1439 * Applications use close() to perform graceful shutdown (as described in
1440 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1441 * by a UDP-style socket.
1445 * ret = close(int sd);
1447 * sd - the socket descriptor of the associations to be closed.
1449 * To gracefully shutdown a specific association represented by the
1450 * UDP-style socket, an application should use the sendmsg() call,
1451 * passing no user data, but including the appropriate flag in the
1452 * ancillary data (see Section xxxx).
1454 * If sd in the close() call is a branched-off socket representing only
1455 * one association, the shutdown is performed on that association only.
1457 * 4.1.6 close() - TCP Style Syntax
1459 * Applications use close() to gracefully close down an association.
1463 * int close(int sd);
1465 * sd - the socket descriptor of the association to be closed.
1467 * After an application calls close() on a socket descriptor, no further
1468 * socket operations will succeed on that descriptor.
1470 * API 7.1.4 SO_LINGER
1472 * An application using the TCP-style socket can use this option to
1473 * perform the SCTP ABORT primitive. The linger option structure is:
1476 * int l_onoff; // option on/off
1477 * int l_linger; // linger time
1480 * To enable the option, set l_onoff to 1. If the l_linger value is set
1481 * to 0, calling close() is the same as the ABORT primitive. If the
1482 * value is set to a negative value, the setsockopt() call will return
1483 * an error. If the value is set to a positive value linger_time, the
1484 * close() can be blocked for at most linger_time ms. If the graceful
1485 * shutdown phase does not finish during this period, close() will
1486 * return but the graceful shutdown phase continues in the system.
1488 static void sctp_close(struct sock
*sk
, long timeout
)
1490 struct net
*net
= sock_net(sk
);
1491 struct sctp_endpoint
*ep
;
1492 struct sctp_association
*asoc
;
1493 struct list_head
*pos
, *temp
;
1494 unsigned int data_was_unread
;
1496 pr_debug("%s: sk:%p, timeout:%ld\n", __func__
, sk
, timeout
);
1498 lock_sock_nested(sk
, SINGLE_DEPTH_NESTING
);
1499 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1500 sk
->sk_state
= SCTP_SS_CLOSING
;
1502 ep
= sctp_sk(sk
)->ep
;
1504 /* Clean up any skbs sitting on the receive queue. */
1505 data_was_unread
= sctp_queue_purge_ulpevents(&sk
->sk_receive_queue
);
1506 data_was_unread
+= sctp_queue_purge_ulpevents(&sctp_sk(sk
)->pd_lobby
);
1508 /* Walk all associations on an endpoint. */
1509 list_for_each_safe(pos
, temp
, &ep
->asocs
) {
1510 asoc
= list_entry(pos
, struct sctp_association
, asocs
);
1512 if (sctp_style(sk
, TCP
)) {
1513 /* A closed association can still be in the list if
1514 * it belongs to a TCP-style listening socket that is
1515 * not yet accepted. If so, free it. If not, send an
1516 * ABORT or SHUTDOWN based on the linger options.
1518 if (sctp_state(asoc
, CLOSED
)) {
1519 sctp_association_free(asoc
);
1524 if (data_was_unread
|| !skb_queue_empty(&asoc
->ulpq
.lobby
) ||
1525 !skb_queue_empty(&asoc
->ulpq
.reasm
) ||
1526 (sock_flag(sk
, SOCK_LINGER
) && !sk
->sk_lingertime
)) {
1527 struct sctp_chunk
*chunk
;
1529 chunk
= sctp_make_abort_user(asoc
, NULL
, 0);
1530 sctp_primitive_ABORT(net
, asoc
, chunk
);
1532 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1535 /* On a TCP-style socket, block for at most linger_time if set. */
1536 if (sctp_style(sk
, TCP
) && timeout
)
1537 sctp_wait_for_close(sk
, timeout
);
1539 /* This will run the backlog queue. */
1542 /* Supposedly, no process has access to the socket, but
1543 * the net layers still may.
1544 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1545 * held and that should be grabbed before socket lock.
1547 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
1548 bh_lock_sock_nested(sk
);
1550 /* Hold the sock, since sk_common_release() will put sock_put()
1551 * and we have just a little more cleanup.
1554 sk_common_release(sk
);
1557 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
1561 SCTP_DBG_OBJCNT_DEC(sock
);
1564 /* Handle EPIPE error. */
1565 static int sctp_error(struct sock
*sk
, int flags
, int err
)
1568 err
= sock_error(sk
) ? : -EPIPE
;
1569 if (err
== -EPIPE
&& !(flags
& MSG_NOSIGNAL
))
1570 send_sig(SIGPIPE
, current
, 0);
1574 /* API 3.1.3 sendmsg() - UDP Style Syntax
1576 * An application uses sendmsg() and recvmsg() calls to transmit data to
1577 * and receive data from its peer.
1579 * ssize_t sendmsg(int socket, const struct msghdr *message,
1582 * socket - the socket descriptor of the endpoint.
1583 * message - pointer to the msghdr structure which contains a single
1584 * user message and possibly some ancillary data.
1586 * See Section 5 for complete description of the data
1589 * flags - flags sent or received with the user message, see Section
1590 * 5 for complete description of the flags.
1592 * Note: This function could use a rewrite especially when explicit
1593 * connect support comes in.
1595 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1597 static int sctp_msghdr_parse(const struct msghdr
*msg
,
1598 struct sctp_cmsgs
*cmsgs
);
1600 static int sctp_sendmsg(struct sock
*sk
, struct msghdr
*msg
, size_t msg_len
)
1602 struct net
*net
= sock_net(sk
);
1603 struct sctp_sock
*sp
;
1604 struct sctp_endpoint
*ep
;
1605 struct sctp_association
*new_asoc
= NULL
, *asoc
= NULL
;
1606 struct sctp_transport
*transport
, *chunk_tp
;
1607 struct sctp_chunk
*chunk
;
1609 struct sockaddr
*msg_name
= NULL
;
1610 struct sctp_sndrcvinfo default_sinfo
;
1611 struct sctp_sndrcvinfo
*sinfo
;
1612 struct sctp_initmsg
*sinit
;
1613 sctp_assoc_t associd
= 0;
1614 struct sctp_cmsgs cmsgs
= { NULL
};
1615 enum sctp_scope scope
;
1616 bool fill_sinfo_ttl
= false, wait_connect
= false;
1617 struct sctp_datamsg
*datamsg
;
1618 int msg_flags
= msg
->msg_flags
;
1619 __u16 sinfo_flags
= 0;
1627 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__
, sk
,
1630 /* We cannot send a message over a TCP-style listening socket. */
1631 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
)) {
1636 /* Parse out the SCTP CMSGs. */
1637 err
= sctp_msghdr_parse(msg
, &cmsgs
);
1639 pr_debug("%s: msghdr parse err:%x\n", __func__
, err
);
1643 /* Fetch the destination address for this packet. This
1644 * address only selects the association--it is not necessarily
1645 * the address we will send to.
1646 * For a peeled-off socket, msg_name is ignored.
1648 if (!sctp_style(sk
, UDP_HIGH_BANDWIDTH
) && msg
->msg_name
) {
1649 int msg_namelen
= msg
->msg_namelen
;
1651 err
= sctp_verify_addr(sk
, (union sctp_addr
*)msg
->msg_name
,
1656 if (msg_namelen
> sizeof(to
))
1657 msg_namelen
= sizeof(to
);
1658 memcpy(&to
, msg
->msg_name
, msg_namelen
);
1659 msg_name
= msg
->msg_name
;
1663 if (cmsgs
.sinfo
!= NULL
) {
1664 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1665 default_sinfo
.sinfo_stream
= cmsgs
.sinfo
->snd_sid
;
1666 default_sinfo
.sinfo_flags
= cmsgs
.sinfo
->snd_flags
;
1667 default_sinfo
.sinfo_ppid
= cmsgs
.sinfo
->snd_ppid
;
1668 default_sinfo
.sinfo_context
= cmsgs
.sinfo
->snd_context
;
1669 default_sinfo
.sinfo_assoc_id
= cmsgs
.sinfo
->snd_assoc_id
;
1671 sinfo
= &default_sinfo
;
1672 fill_sinfo_ttl
= true;
1674 sinfo
= cmsgs
.srinfo
;
1676 /* Did the user specify SNDINFO/SNDRCVINFO? */
1678 sinfo_flags
= sinfo
->sinfo_flags
;
1679 associd
= sinfo
->sinfo_assoc_id
;
1682 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__
,
1683 msg_len
, sinfo_flags
);
1685 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1686 if (sctp_style(sk
, TCP
) && (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
))) {
1691 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1692 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1693 * If SCTP_ABORT is set, the message length could be non zero with
1694 * the msg_iov set to the user abort reason.
1696 if (((sinfo_flags
& SCTP_EOF
) && (msg_len
> 0)) ||
1697 (!(sinfo_flags
& (SCTP_EOF
|SCTP_ABORT
)) && (msg_len
== 0))) {
1702 /* If SCTP_ADDR_OVER is set, there must be an address
1703 * specified in msg_name.
1705 if ((sinfo_flags
& SCTP_ADDR_OVER
) && (!msg
->msg_name
)) {
1712 pr_debug("%s: about to look up association\n", __func__
);
1716 /* If a msg_name has been specified, assume this is to be used. */
1718 /* Look for a matching association on the endpoint. */
1719 asoc
= sctp_endpoint_lookup_assoc(ep
, &to
, &transport
);
1721 /* If we could not find a matching association on the
1722 * endpoint, make sure that it is not a TCP-style
1723 * socket that already has an association or there is
1724 * no peeled-off association on another socket.
1727 ((sctp_style(sk
, TCP
) &&
1728 (sctp_sstate(sk
, ESTABLISHED
) ||
1729 sctp_sstate(sk
, CLOSING
))) ||
1730 sctp_endpoint_is_peeled_off(ep
, &to
))) {
1731 err
= -EADDRNOTAVAIL
;
1735 asoc
= sctp_id2assoc(sk
, associd
);
1743 pr_debug("%s: just looked up association:%p\n", __func__
, asoc
);
1745 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1746 * socket that has an association in CLOSED state. This can
1747 * happen when an accepted socket has an association that is
1750 if (sctp_state(asoc
, CLOSED
) && sctp_style(sk
, TCP
)) {
1755 if (sinfo_flags
& SCTP_EOF
) {
1756 pr_debug("%s: shutting down association:%p\n",
1759 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
1763 if (sinfo_flags
& SCTP_ABORT
) {
1765 chunk
= sctp_make_abort_user(asoc
, msg
, msg_len
);
1771 pr_debug("%s: aborting association:%p\n",
1774 sctp_primitive_ABORT(net
, asoc
, chunk
);
1780 /* Do we need to create the association? */
1782 pr_debug("%s: there is no association yet\n", __func__
);
1784 if (sinfo_flags
& (SCTP_EOF
| SCTP_ABORT
)) {
1789 /* Check for invalid stream against the stream counts,
1790 * either the default or the user specified stream counts.
1793 if (!sinit
|| !sinit
->sinit_num_ostreams
) {
1794 /* Check against the defaults. */
1795 if (sinfo
->sinfo_stream
>=
1796 sp
->initmsg
.sinit_num_ostreams
) {
1801 /* Check against the requested. */
1802 if (sinfo
->sinfo_stream
>=
1803 sinit
->sinit_num_ostreams
) {
1811 * API 3.1.2 bind() - UDP Style Syntax
1812 * If a bind() or sctp_bindx() is not called prior to a
1813 * sendmsg() call that initiates a new association, the
1814 * system picks an ephemeral port and will choose an address
1815 * set equivalent to binding with a wildcard address.
1817 if (!ep
->base
.bind_addr
.port
) {
1818 if (sctp_autobind(sk
)) {
1824 * If an unprivileged user inherits a one-to-many
1825 * style socket with open associations on a privileged
1826 * port, it MAY be permitted to accept new associations,
1827 * but it SHOULD NOT be permitted to open new
1830 if (ep
->base
.bind_addr
.port
< inet_prot_sock(net
) &&
1831 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
)) {
1837 scope
= sctp_scope(&to
);
1838 new_asoc
= sctp_association_new(ep
, sk
, scope
, GFP_KERNEL
);
1844 err
= sctp_assoc_set_bind_addr_from_ep(asoc
, scope
, GFP_KERNEL
);
1850 /* If the SCTP_INIT ancillary data is specified, set all
1851 * the association init values accordingly.
1854 if (sinit
->sinit_num_ostreams
) {
1855 asoc
->c
.sinit_num_ostreams
=
1856 sinit
->sinit_num_ostreams
;
1858 if (sinit
->sinit_max_instreams
) {
1859 asoc
->c
.sinit_max_instreams
=
1860 sinit
->sinit_max_instreams
;
1862 if (sinit
->sinit_max_attempts
) {
1863 asoc
->max_init_attempts
1864 = sinit
->sinit_max_attempts
;
1866 if (sinit
->sinit_max_init_timeo
) {
1867 asoc
->max_init_timeo
=
1868 msecs_to_jiffies(sinit
->sinit_max_init_timeo
);
1872 /* Prime the peer's transport structures. */
1873 transport
= sctp_assoc_add_peer(asoc
, &to
, GFP_KERNEL
, SCTP_UNKNOWN
);
1880 /* ASSERT: we have a valid association at this point. */
1881 pr_debug("%s: we have a valid association\n", __func__
);
1884 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1885 * one with some defaults.
1887 memset(&default_sinfo
, 0, sizeof(default_sinfo
));
1888 default_sinfo
.sinfo_stream
= asoc
->default_stream
;
1889 default_sinfo
.sinfo_flags
= asoc
->default_flags
;
1890 default_sinfo
.sinfo_ppid
= asoc
->default_ppid
;
1891 default_sinfo
.sinfo_context
= asoc
->default_context
;
1892 default_sinfo
.sinfo_timetolive
= asoc
->default_timetolive
;
1893 default_sinfo
.sinfo_assoc_id
= sctp_assoc2id(asoc
);
1895 sinfo
= &default_sinfo
;
1896 } else if (fill_sinfo_ttl
) {
1897 /* In case SNDINFO was specified, we still need to fill
1898 * it with a default ttl from the assoc here.
1900 sinfo
->sinfo_timetolive
= asoc
->default_timetolive
;
1903 /* API 7.1.7, the sndbuf size per association bounds the
1904 * maximum size of data that can be sent in a single send call.
1906 if (msg_len
> sk
->sk_sndbuf
) {
1911 if (asoc
->pmtu_pending
)
1912 sctp_assoc_pending_pmtu(asoc
);
1914 /* If fragmentation is disabled and the message length exceeds the
1915 * association fragmentation point, return EMSGSIZE. The I-D
1916 * does not specify what this error is, but this looks like
1919 if (sctp_sk(sk
)->disable_fragments
&& (msg_len
> asoc
->frag_point
)) {
1924 /* Check for invalid stream. */
1925 if (sinfo
->sinfo_stream
>= asoc
->stream
.outcnt
) {
1930 if (sctp_wspace(asoc
) < msg_len
)
1931 sctp_prsctp_prune(asoc
, sinfo
, msg_len
- sctp_wspace(asoc
));
1933 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1934 if (!sctp_wspace(asoc
)) {
1935 err
= sctp_wait_for_sndbuf(asoc
, &timeo
, msg_len
);
1940 /* If an address is passed with the sendto/sendmsg call, it is used
1941 * to override the primary destination address in the TCP model, or
1942 * when SCTP_ADDR_OVER flag is set in the UDP model.
1944 if ((sctp_style(sk
, TCP
) && msg_name
) ||
1945 (sinfo_flags
& SCTP_ADDR_OVER
)) {
1946 chunk_tp
= sctp_assoc_lookup_paddr(asoc
, &to
);
1954 /* Auto-connect, if we aren't connected already. */
1955 if (sctp_state(asoc
, CLOSED
)) {
1956 err
= sctp_primitive_ASSOCIATE(net
, asoc
, NULL
);
1960 wait_connect
= true;
1961 pr_debug("%s: we associated primitively\n", __func__
);
1964 /* Break the message into multiple chunks of maximum size. */
1965 datamsg
= sctp_datamsg_from_user(asoc
, sinfo
, &msg
->msg_iter
);
1966 if (IS_ERR(datamsg
)) {
1967 err
= PTR_ERR(datamsg
);
1970 asoc
->force_delay
= !!(msg
->msg_flags
& MSG_MORE
);
1972 /* Now send the (possibly) fragmented message. */
1973 list_for_each_entry(chunk
, &datamsg
->chunks
, frag_list
) {
1974 sctp_chunk_hold(chunk
);
1976 /* Do accounting for the write space. */
1977 sctp_set_owner_w(chunk
);
1979 chunk
->transport
= chunk_tp
;
1982 /* Send it to the lower layers. Note: all chunks
1983 * must either fail or succeed. The lower layer
1984 * works that way today. Keep it that way or this
1987 err
= sctp_primitive_SEND(net
, asoc
, datamsg
);
1988 /* Did the lower layer accept the chunk? */
1990 sctp_datamsg_free(datamsg
);
1994 pr_debug("%s: we sent primitively\n", __func__
);
1996 sctp_datamsg_put(datamsg
);
1999 if (unlikely(wait_connect
)) {
2000 timeo
= sock_sndtimeo(sk
, msg_flags
& MSG_DONTWAIT
);
2001 sctp_wait_for_connect(asoc
, &timeo
);
2004 /* If we are already past ASSOCIATE, the lower
2005 * layers are responsible for association cleanup.
2011 sctp_association_free(asoc
);
2016 return sctp_error(sk
, msg_flags
, err
);
2023 err
= sock_error(sk
);
2033 /* This is an extended version of skb_pull() that removes the data from the
2034 * start of a skb even when data is spread across the list of skb's in the
2035 * frag_list. len specifies the total amount of data that needs to be removed.
2036 * when 'len' bytes could be removed from the skb, it returns 0.
2037 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2038 * could not be removed.
2040 static int sctp_skb_pull(struct sk_buff
*skb
, int len
)
2042 struct sk_buff
*list
;
2043 int skb_len
= skb_headlen(skb
);
2046 if (len
<= skb_len
) {
2047 __skb_pull(skb
, len
);
2051 __skb_pull(skb
, skb_len
);
2053 skb_walk_frags(skb
, list
) {
2054 rlen
= sctp_skb_pull(list
, len
);
2055 skb
->len
-= (len
-rlen
);
2056 skb
->data_len
-= (len
-rlen
);
2067 /* API 3.1.3 recvmsg() - UDP Style Syntax
2069 * ssize_t recvmsg(int socket, struct msghdr *message,
2072 * socket - the socket descriptor of the endpoint.
2073 * message - pointer to the msghdr structure which contains a single
2074 * user message and possibly some ancillary data.
2076 * See Section 5 for complete description of the data
2079 * flags - flags sent or received with the user message, see Section
2080 * 5 for complete description of the flags.
2082 static int sctp_recvmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
,
2083 int noblock
, int flags
, int *addr_len
)
2085 struct sctp_ulpevent
*event
= NULL
;
2086 struct sctp_sock
*sp
= sctp_sk(sk
);
2087 struct sk_buff
*skb
, *head_skb
;
2092 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2093 "addr_len:%p)\n", __func__
, sk
, msg
, len
, noblock
, flags
,
2098 if (sctp_style(sk
, TCP
) && !sctp_sstate(sk
, ESTABLISHED
) &&
2099 !sctp_sstate(sk
, CLOSING
) && !sctp_sstate(sk
, CLOSED
)) {
2104 skb
= sctp_skb_recv_datagram(sk
, flags
, noblock
, &err
);
2108 /* Get the total length of the skb including any skb's in the
2117 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
2119 event
= sctp_skb2event(skb
);
2124 if (event
->chunk
&& event
->chunk
->head_skb
)
2125 head_skb
= event
->chunk
->head_skb
;
2128 sock_recv_ts_and_drops(msg
, sk
, head_skb
);
2129 if (sctp_ulpevent_is_notification(event
)) {
2130 msg
->msg_flags
|= MSG_NOTIFICATION
;
2131 sp
->pf
->event_msgname(event
, msg
->msg_name
, addr_len
);
2133 sp
->pf
->skb_msgname(head_skb
, msg
->msg_name
, addr_len
);
2136 /* Check if we allow SCTP_NXTINFO. */
2137 if (sp
->recvnxtinfo
)
2138 sctp_ulpevent_read_nxtinfo(event
, msg
, sk
);
2139 /* Check if we allow SCTP_RCVINFO. */
2140 if (sp
->recvrcvinfo
)
2141 sctp_ulpevent_read_rcvinfo(event
, msg
);
2142 /* Check if we allow SCTP_SNDRCVINFO. */
2143 if (sp
->subscribe
.sctp_data_io_event
)
2144 sctp_ulpevent_read_sndrcvinfo(event
, msg
);
2148 /* If skb's length exceeds the user's buffer, update the skb and
2149 * push it back to the receive_queue so that the next call to
2150 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2152 if (skb_len
> copied
) {
2153 msg
->msg_flags
&= ~MSG_EOR
;
2154 if (flags
& MSG_PEEK
)
2156 sctp_skb_pull(skb
, copied
);
2157 skb_queue_head(&sk
->sk_receive_queue
, skb
);
2159 /* When only partial message is copied to the user, increase
2160 * rwnd by that amount. If all the data in the skb is read,
2161 * rwnd is updated when the event is freed.
2163 if (!sctp_ulpevent_is_notification(event
))
2164 sctp_assoc_rwnd_increase(event
->asoc
, copied
);
2166 } else if ((event
->msg_flags
& MSG_NOTIFICATION
) ||
2167 (event
->msg_flags
& MSG_EOR
))
2168 msg
->msg_flags
|= MSG_EOR
;
2170 msg
->msg_flags
&= ~MSG_EOR
;
2173 if (flags
& MSG_PEEK
) {
2174 /* Release the skb reference acquired after peeking the skb in
2175 * sctp_skb_recv_datagram().
2179 /* Free the event which includes releasing the reference to
2180 * the owner of the skb, freeing the skb and updating the
2183 sctp_ulpevent_free(event
);
2190 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2192 * This option is a on/off flag. If enabled no SCTP message
2193 * fragmentation will be performed. Instead if a message being sent
2194 * exceeds the current PMTU size, the message will NOT be sent and
2195 * instead a error will be indicated to the user.
2197 static int sctp_setsockopt_disable_fragments(struct sock
*sk
,
2198 char __user
*optval
,
2199 unsigned int optlen
)
2203 if (optlen
< sizeof(int))
2206 if (get_user(val
, (int __user
*)optval
))
2209 sctp_sk(sk
)->disable_fragments
= (val
== 0) ? 0 : 1;
2214 static int sctp_setsockopt_events(struct sock
*sk
, char __user
*optval
,
2215 unsigned int optlen
)
2217 struct sctp_association
*asoc
;
2218 struct sctp_ulpevent
*event
;
2220 if (optlen
> sizeof(struct sctp_event_subscribe
))
2222 if (copy_from_user(&sctp_sk(sk
)->subscribe
, optval
, optlen
))
2225 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2226 * if there is no data to be sent or retransmit, the stack will
2227 * immediately send up this notification.
2229 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT
,
2230 &sctp_sk(sk
)->subscribe
)) {
2231 asoc
= sctp_id2assoc(sk
, 0);
2233 if (asoc
&& sctp_outq_is_empty(&asoc
->outqueue
)) {
2234 event
= sctp_ulpevent_make_sender_dry_event(asoc
,
2239 sctp_ulpq_tail_event(&asoc
->ulpq
, event
);
2246 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2248 * This socket option is applicable to the UDP-style socket only. When
2249 * set it will cause associations that are idle for more than the
2250 * specified number of seconds to automatically close. An association
2251 * being idle is defined an association that has NOT sent or received
2252 * user data. The special value of '0' indicates that no automatic
2253 * close of any associations should be performed. The option expects an
2254 * integer defining the number of seconds of idle time before an
2255 * association is closed.
2257 static int sctp_setsockopt_autoclose(struct sock
*sk
, char __user
*optval
,
2258 unsigned int optlen
)
2260 struct sctp_sock
*sp
= sctp_sk(sk
);
2261 struct net
*net
= sock_net(sk
);
2263 /* Applicable to UDP-style socket only */
2264 if (sctp_style(sk
, TCP
))
2266 if (optlen
!= sizeof(int))
2268 if (copy_from_user(&sp
->autoclose
, optval
, optlen
))
2271 if (sp
->autoclose
> net
->sctp
.max_autoclose
)
2272 sp
->autoclose
= net
->sctp
.max_autoclose
;
2277 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2279 * Applications can enable or disable heartbeats for any peer address of
2280 * an association, modify an address's heartbeat interval, force a
2281 * heartbeat to be sent immediately, and adjust the address's maximum
2282 * number of retransmissions sent before an address is considered
2283 * unreachable. The following structure is used to access and modify an
2284 * address's parameters:
2286 * struct sctp_paddrparams {
2287 * sctp_assoc_t spp_assoc_id;
2288 * struct sockaddr_storage spp_address;
2289 * uint32_t spp_hbinterval;
2290 * uint16_t spp_pathmaxrxt;
2291 * uint32_t spp_pathmtu;
2292 * uint32_t spp_sackdelay;
2293 * uint32_t spp_flags;
2296 * spp_assoc_id - (one-to-many style socket) This is filled in the
2297 * application, and identifies the association for
2299 * spp_address - This specifies which address is of interest.
2300 * spp_hbinterval - This contains the value of the heartbeat interval,
2301 * in milliseconds. If a value of zero
2302 * is present in this field then no changes are to
2303 * be made to this parameter.
2304 * spp_pathmaxrxt - This contains the maximum number of
2305 * retransmissions before this address shall be
2306 * considered unreachable. If a value of zero
2307 * is present in this field then no changes are to
2308 * be made to this parameter.
2309 * spp_pathmtu - When Path MTU discovery is disabled the value
2310 * specified here will be the "fixed" path mtu.
2311 * Note that if the spp_address field is empty
2312 * then all associations on this address will
2313 * have this fixed path mtu set upon them.
2315 * spp_sackdelay - When delayed sack is enabled, this value specifies
2316 * the number of milliseconds that sacks will be delayed
2317 * for. This value will apply to all addresses of an
2318 * association if the spp_address field is empty. Note
2319 * also, that if delayed sack is enabled and this
2320 * value is set to 0, no change is made to the last
2321 * recorded delayed sack timer value.
2323 * spp_flags - These flags are used to control various features
2324 * on an association. The flag field may contain
2325 * zero or more of the following options.
2327 * SPP_HB_ENABLE - Enable heartbeats on the
2328 * specified address. Note that if the address
2329 * field is empty all addresses for the association
2330 * have heartbeats enabled upon them.
2332 * SPP_HB_DISABLE - Disable heartbeats on the
2333 * speicifed address. Note that if the address
2334 * field is empty all addresses for the association
2335 * will have their heartbeats disabled. Note also
2336 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2337 * mutually exclusive, only one of these two should
2338 * be specified. Enabling both fields will have
2339 * undetermined results.
2341 * SPP_HB_DEMAND - Request a user initiated heartbeat
2342 * to be made immediately.
2344 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2345 * heartbeat delayis to be set to the value of 0
2348 * SPP_PMTUD_ENABLE - This field will enable PMTU
2349 * discovery upon the specified address. Note that
2350 * if the address feild is empty then all addresses
2351 * on the association are effected.
2353 * SPP_PMTUD_DISABLE - This field will disable PMTU
2354 * discovery upon the specified address. Note that
2355 * if the address feild is empty then all addresses
2356 * on the association are effected. Not also that
2357 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2358 * exclusive. Enabling both will have undetermined
2361 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2362 * on delayed sack. The time specified in spp_sackdelay
2363 * is used to specify the sack delay for this address. Note
2364 * that if spp_address is empty then all addresses will
2365 * enable delayed sack and take on the sack delay
2366 * value specified in spp_sackdelay.
2367 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2368 * off delayed sack. If the spp_address field is blank then
2369 * delayed sack is disabled for the entire association. Note
2370 * also that this field is mutually exclusive to
2371 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2374 static int sctp_apply_peer_addr_params(struct sctp_paddrparams
*params
,
2375 struct sctp_transport
*trans
,
2376 struct sctp_association
*asoc
,
2377 struct sctp_sock
*sp
,
2380 int sackdelay_change
)
2384 if (params
->spp_flags
& SPP_HB_DEMAND
&& trans
) {
2385 struct net
*net
= sock_net(trans
->asoc
->base
.sk
);
2387 error
= sctp_primitive_REQUESTHEARTBEAT(net
, trans
->asoc
, trans
);
2392 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2393 * this field is ignored. Note also that a value of zero indicates
2394 * the current setting should be left unchanged.
2396 if (params
->spp_flags
& SPP_HB_ENABLE
) {
2398 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2399 * set. This lets us use 0 value when this flag
2402 if (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)
2403 params
->spp_hbinterval
= 0;
2405 if (params
->spp_hbinterval
||
2406 (params
->spp_flags
& SPP_HB_TIME_IS_ZERO
)) {
2409 msecs_to_jiffies(params
->spp_hbinterval
);
2412 msecs_to_jiffies(params
->spp_hbinterval
);
2414 sp
->hbinterval
= params
->spp_hbinterval
;
2421 trans
->param_flags
=
2422 (trans
->param_flags
& ~SPP_HB
) | hb_change
;
2425 (asoc
->param_flags
& ~SPP_HB
) | hb_change
;
2428 (sp
->param_flags
& ~SPP_HB
) | hb_change
;
2432 /* When Path MTU discovery is disabled the value specified here will
2433 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2434 * include the flag SPP_PMTUD_DISABLE for this field to have any
2437 if ((params
->spp_flags
& SPP_PMTUD_DISABLE
) && params
->spp_pathmtu
) {
2439 trans
->pathmtu
= params
->spp_pathmtu
;
2440 sctp_assoc_sync_pmtu(asoc
);
2442 asoc
->pathmtu
= params
->spp_pathmtu
;
2444 sp
->pathmtu
= params
->spp_pathmtu
;
2450 int update
= (trans
->param_flags
& SPP_PMTUD_DISABLE
) &&
2451 (params
->spp_flags
& SPP_PMTUD_ENABLE
);
2452 trans
->param_flags
=
2453 (trans
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2455 sctp_transport_pmtu(trans
, sctp_opt2sk(sp
));
2456 sctp_assoc_sync_pmtu(asoc
);
2460 (asoc
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2463 (sp
->param_flags
& ~SPP_PMTUD
) | pmtud_change
;
2467 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2468 * value of this field is ignored. Note also that a value of zero
2469 * indicates the current setting should be left unchanged.
2471 if ((params
->spp_flags
& SPP_SACKDELAY_ENABLE
) && params
->spp_sackdelay
) {
2474 msecs_to_jiffies(params
->spp_sackdelay
);
2477 msecs_to_jiffies(params
->spp_sackdelay
);
2479 sp
->sackdelay
= params
->spp_sackdelay
;
2483 if (sackdelay_change
) {
2485 trans
->param_flags
=
2486 (trans
->param_flags
& ~SPP_SACKDELAY
) |
2490 (asoc
->param_flags
& ~SPP_SACKDELAY
) |
2494 (sp
->param_flags
& ~SPP_SACKDELAY
) |
2499 /* Note that a value of zero indicates the current setting should be
2502 if (params
->spp_pathmaxrxt
) {
2504 trans
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2506 asoc
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2508 sp
->pathmaxrxt
= params
->spp_pathmaxrxt
;
2515 static int sctp_setsockopt_peer_addr_params(struct sock
*sk
,
2516 char __user
*optval
,
2517 unsigned int optlen
)
2519 struct sctp_paddrparams params
;
2520 struct sctp_transport
*trans
= NULL
;
2521 struct sctp_association
*asoc
= NULL
;
2522 struct sctp_sock
*sp
= sctp_sk(sk
);
2524 int hb_change
, pmtud_change
, sackdelay_change
;
2526 if (optlen
!= sizeof(struct sctp_paddrparams
))
2529 if (copy_from_user(¶ms
, optval
, optlen
))
2532 /* Validate flags and value parameters. */
2533 hb_change
= params
.spp_flags
& SPP_HB
;
2534 pmtud_change
= params
.spp_flags
& SPP_PMTUD
;
2535 sackdelay_change
= params
.spp_flags
& SPP_SACKDELAY
;
2537 if (hb_change
== SPP_HB
||
2538 pmtud_change
== SPP_PMTUD
||
2539 sackdelay_change
== SPP_SACKDELAY
||
2540 params
.spp_sackdelay
> 500 ||
2541 (params
.spp_pathmtu
&&
2542 params
.spp_pathmtu
< SCTP_DEFAULT_MINSEGMENT
))
2545 /* If an address other than INADDR_ANY is specified, and
2546 * no transport is found, then the request is invalid.
2548 if (!sctp_is_any(sk
, (union sctp_addr
*)¶ms
.spp_address
)) {
2549 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
2550 params
.spp_assoc_id
);
2555 /* Get association, if assoc_id != 0 and the socket is a one
2556 * to many style socket, and an association was not found, then
2557 * the id was invalid.
2559 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
2560 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
))
2563 /* Heartbeat demand can only be sent on a transport or
2564 * association, but not a socket.
2566 if (params
.spp_flags
& SPP_HB_DEMAND
&& !trans
&& !asoc
)
2569 /* Process parameters. */
2570 error
= sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2571 hb_change
, pmtud_change
,
2577 /* If changes are for association, also apply parameters to each
2580 if (!trans
&& asoc
) {
2581 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2583 sctp_apply_peer_addr_params(¶ms
, trans
, asoc
, sp
,
2584 hb_change
, pmtud_change
,
2592 static inline __u32
sctp_spp_sackdelay_enable(__u32 param_flags
)
2594 return (param_flags
& ~SPP_SACKDELAY
) | SPP_SACKDELAY_ENABLE
;
2597 static inline __u32
sctp_spp_sackdelay_disable(__u32 param_flags
)
2599 return (param_flags
& ~SPP_SACKDELAY
) | SPP_SACKDELAY_DISABLE
;
2603 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2605 * This option will effect the way delayed acks are performed. This
2606 * option allows you to get or set the delayed ack time, in
2607 * milliseconds. It also allows changing the delayed ack frequency.
2608 * Changing the frequency to 1 disables the delayed sack algorithm. If
2609 * the assoc_id is 0, then this sets or gets the endpoints default
2610 * values. If the assoc_id field is non-zero, then the set or get
2611 * effects the specified association for the one to many model (the
2612 * assoc_id field is ignored by the one to one model). Note that if
2613 * sack_delay or sack_freq are 0 when setting this option, then the
2614 * current values will remain unchanged.
2616 * struct sctp_sack_info {
2617 * sctp_assoc_t sack_assoc_id;
2618 * uint32_t sack_delay;
2619 * uint32_t sack_freq;
2622 * sack_assoc_id - This parameter, indicates which association the user
2623 * is performing an action upon. Note that if this field's value is
2624 * zero then the endpoints default value is changed (effecting future
2625 * associations only).
2627 * sack_delay - This parameter contains the number of milliseconds that
2628 * the user is requesting the delayed ACK timer be set to. Note that
2629 * this value is defined in the standard to be between 200 and 500
2632 * sack_freq - This parameter contains the number of packets that must
2633 * be received before a sack is sent without waiting for the delay
2634 * timer to expire. The default value for this is 2, setting this
2635 * value to 1 will disable the delayed sack algorithm.
2638 static int sctp_setsockopt_delayed_ack(struct sock
*sk
,
2639 char __user
*optval
, unsigned int optlen
)
2641 struct sctp_sack_info params
;
2642 struct sctp_transport
*trans
= NULL
;
2643 struct sctp_association
*asoc
= NULL
;
2644 struct sctp_sock
*sp
= sctp_sk(sk
);
2646 if (optlen
== sizeof(struct sctp_sack_info
)) {
2647 if (copy_from_user(¶ms
, optval
, optlen
))
2650 if (params
.sack_delay
== 0 && params
.sack_freq
== 0)
2652 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
2653 pr_warn_ratelimited(DEPRECATED
2655 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2656 "Use struct sctp_sack_info instead\n",
2657 current
->comm
, task_pid_nr(current
));
2658 if (copy_from_user(¶ms
, optval
, optlen
))
2661 if (params
.sack_delay
== 0)
2662 params
.sack_freq
= 1;
2664 params
.sack_freq
= 0;
2668 /* Validate value parameter. */
2669 if (params
.sack_delay
> 500)
2672 /* Get association, if sack_assoc_id != 0 and the socket is a one
2673 * to many style socket, and an association was not found, then
2674 * the id was invalid.
2676 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
2677 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
2680 if (params
.sack_delay
) {
2683 msecs_to_jiffies(params
.sack_delay
);
2685 sctp_spp_sackdelay_enable(asoc
->param_flags
);
2687 sp
->sackdelay
= params
.sack_delay
;
2689 sctp_spp_sackdelay_enable(sp
->param_flags
);
2693 if (params
.sack_freq
== 1) {
2696 sctp_spp_sackdelay_disable(asoc
->param_flags
);
2699 sctp_spp_sackdelay_disable(sp
->param_flags
);
2701 } else if (params
.sack_freq
> 1) {
2703 asoc
->sackfreq
= params
.sack_freq
;
2705 sctp_spp_sackdelay_enable(asoc
->param_flags
);
2707 sp
->sackfreq
= params
.sack_freq
;
2709 sctp_spp_sackdelay_enable(sp
->param_flags
);
2713 /* If change is for association, also apply to each transport. */
2715 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
2717 if (params
.sack_delay
) {
2719 msecs_to_jiffies(params
.sack_delay
);
2720 trans
->param_flags
=
2721 sctp_spp_sackdelay_enable(trans
->param_flags
);
2723 if (params
.sack_freq
== 1) {
2724 trans
->param_flags
=
2725 sctp_spp_sackdelay_disable(trans
->param_flags
);
2726 } else if (params
.sack_freq
> 1) {
2727 trans
->sackfreq
= params
.sack_freq
;
2728 trans
->param_flags
=
2729 sctp_spp_sackdelay_enable(trans
->param_flags
);
2737 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2739 * Applications can specify protocol parameters for the default association
2740 * initialization. The option name argument to setsockopt() and getsockopt()
2743 * Setting initialization parameters is effective only on an unconnected
2744 * socket (for UDP-style sockets only future associations are effected
2745 * by the change). With TCP-style sockets, this option is inherited by
2746 * sockets derived from a listener socket.
2748 static int sctp_setsockopt_initmsg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2750 struct sctp_initmsg sinit
;
2751 struct sctp_sock
*sp
= sctp_sk(sk
);
2753 if (optlen
!= sizeof(struct sctp_initmsg
))
2755 if (copy_from_user(&sinit
, optval
, optlen
))
2758 if (sinit
.sinit_num_ostreams
)
2759 sp
->initmsg
.sinit_num_ostreams
= sinit
.sinit_num_ostreams
;
2760 if (sinit
.sinit_max_instreams
)
2761 sp
->initmsg
.sinit_max_instreams
= sinit
.sinit_max_instreams
;
2762 if (sinit
.sinit_max_attempts
)
2763 sp
->initmsg
.sinit_max_attempts
= sinit
.sinit_max_attempts
;
2764 if (sinit
.sinit_max_init_timeo
)
2765 sp
->initmsg
.sinit_max_init_timeo
= sinit
.sinit_max_init_timeo
;
2771 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2773 * Applications that wish to use the sendto() system call may wish to
2774 * specify a default set of parameters that would normally be supplied
2775 * through the inclusion of ancillary data. This socket option allows
2776 * such an application to set the default sctp_sndrcvinfo structure.
2777 * The application that wishes to use this socket option simply passes
2778 * in to this call the sctp_sndrcvinfo structure defined in Section
2779 * 5.2.2) The input parameters accepted by this call include
2780 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2781 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2782 * to this call if the caller is using the UDP model.
2784 static int sctp_setsockopt_default_send_param(struct sock
*sk
,
2785 char __user
*optval
,
2786 unsigned int optlen
)
2788 struct sctp_sock
*sp
= sctp_sk(sk
);
2789 struct sctp_association
*asoc
;
2790 struct sctp_sndrcvinfo info
;
2792 if (optlen
!= sizeof(info
))
2794 if (copy_from_user(&info
, optval
, optlen
))
2796 if (info
.sinfo_flags
&
2797 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
2798 SCTP_ABORT
| SCTP_EOF
))
2801 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
2802 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
2805 asoc
->default_stream
= info
.sinfo_stream
;
2806 asoc
->default_flags
= info
.sinfo_flags
;
2807 asoc
->default_ppid
= info
.sinfo_ppid
;
2808 asoc
->default_context
= info
.sinfo_context
;
2809 asoc
->default_timetolive
= info
.sinfo_timetolive
;
2811 sp
->default_stream
= info
.sinfo_stream
;
2812 sp
->default_flags
= info
.sinfo_flags
;
2813 sp
->default_ppid
= info
.sinfo_ppid
;
2814 sp
->default_context
= info
.sinfo_context
;
2815 sp
->default_timetolive
= info
.sinfo_timetolive
;
2821 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2822 * (SCTP_DEFAULT_SNDINFO)
2824 static int sctp_setsockopt_default_sndinfo(struct sock
*sk
,
2825 char __user
*optval
,
2826 unsigned int optlen
)
2828 struct sctp_sock
*sp
= sctp_sk(sk
);
2829 struct sctp_association
*asoc
;
2830 struct sctp_sndinfo info
;
2832 if (optlen
!= sizeof(info
))
2834 if (copy_from_user(&info
, optval
, optlen
))
2836 if (info
.snd_flags
&
2837 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
2838 SCTP_ABORT
| SCTP_EOF
))
2841 asoc
= sctp_id2assoc(sk
, info
.snd_assoc_id
);
2842 if (!asoc
&& info
.snd_assoc_id
&& sctp_style(sk
, UDP
))
2845 asoc
->default_stream
= info
.snd_sid
;
2846 asoc
->default_flags
= info
.snd_flags
;
2847 asoc
->default_ppid
= info
.snd_ppid
;
2848 asoc
->default_context
= info
.snd_context
;
2850 sp
->default_stream
= info
.snd_sid
;
2851 sp
->default_flags
= info
.snd_flags
;
2852 sp
->default_ppid
= info
.snd_ppid
;
2853 sp
->default_context
= info
.snd_context
;
2859 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2861 * Requests that the local SCTP stack use the enclosed peer address as
2862 * the association primary. The enclosed address must be one of the
2863 * association peer's addresses.
2865 static int sctp_setsockopt_primary_addr(struct sock
*sk
, char __user
*optval
,
2866 unsigned int optlen
)
2868 struct sctp_prim prim
;
2869 struct sctp_transport
*trans
;
2871 if (optlen
!= sizeof(struct sctp_prim
))
2874 if (copy_from_user(&prim
, optval
, sizeof(struct sctp_prim
)))
2877 trans
= sctp_addr_id2transport(sk
, &prim
.ssp_addr
, prim
.ssp_assoc_id
);
2881 sctp_assoc_set_primary(trans
->asoc
, trans
);
2887 * 7.1.5 SCTP_NODELAY
2889 * Turn on/off any Nagle-like algorithm. This means that packets are
2890 * generally sent as soon as possible and no unnecessary delays are
2891 * introduced, at the cost of more packets in the network. Expects an
2892 * integer boolean flag.
2894 static int sctp_setsockopt_nodelay(struct sock
*sk
, char __user
*optval
,
2895 unsigned int optlen
)
2899 if (optlen
< sizeof(int))
2901 if (get_user(val
, (int __user
*)optval
))
2904 sctp_sk(sk
)->nodelay
= (val
== 0) ? 0 : 1;
2910 * 7.1.1 SCTP_RTOINFO
2912 * The protocol parameters used to initialize and bound retransmission
2913 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2914 * and modify these parameters.
2915 * All parameters are time values, in milliseconds. A value of 0, when
2916 * modifying the parameters, indicates that the current value should not
2920 static int sctp_setsockopt_rtoinfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2922 struct sctp_rtoinfo rtoinfo
;
2923 struct sctp_association
*asoc
;
2924 unsigned long rto_min
, rto_max
;
2925 struct sctp_sock
*sp
= sctp_sk(sk
);
2927 if (optlen
!= sizeof (struct sctp_rtoinfo
))
2930 if (copy_from_user(&rtoinfo
, optval
, optlen
))
2933 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
2935 /* Set the values to the specific association */
2936 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
2939 rto_max
= rtoinfo
.srto_max
;
2940 rto_min
= rtoinfo
.srto_min
;
2943 rto_max
= asoc
? msecs_to_jiffies(rto_max
) : rto_max
;
2945 rto_max
= asoc
? asoc
->rto_max
: sp
->rtoinfo
.srto_max
;
2948 rto_min
= asoc
? msecs_to_jiffies(rto_min
) : rto_min
;
2950 rto_min
= asoc
? asoc
->rto_min
: sp
->rtoinfo
.srto_min
;
2952 if (rto_min
> rto_max
)
2956 if (rtoinfo
.srto_initial
!= 0)
2958 msecs_to_jiffies(rtoinfo
.srto_initial
);
2959 asoc
->rto_max
= rto_max
;
2960 asoc
->rto_min
= rto_min
;
2962 /* If there is no association or the association-id = 0
2963 * set the values to the endpoint.
2965 if (rtoinfo
.srto_initial
!= 0)
2966 sp
->rtoinfo
.srto_initial
= rtoinfo
.srto_initial
;
2967 sp
->rtoinfo
.srto_max
= rto_max
;
2968 sp
->rtoinfo
.srto_min
= rto_min
;
2976 * 7.1.2 SCTP_ASSOCINFO
2978 * This option is used to tune the maximum retransmission attempts
2979 * of the association.
2980 * Returns an error if the new association retransmission value is
2981 * greater than the sum of the retransmission value of the peer.
2982 * See [SCTP] for more information.
2985 static int sctp_setsockopt_associnfo(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
2988 struct sctp_assocparams assocparams
;
2989 struct sctp_association
*asoc
;
2991 if (optlen
!= sizeof(struct sctp_assocparams
))
2993 if (copy_from_user(&assocparams
, optval
, optlen
))
2996 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
2998 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
3001 /* Set the values to the specific association */
3003 if (assocparams
.sasoc_asocmaxrxt
!= 0) {
3006 struct sctp_transport
*peer_addr
;
3008 list_for_each_entry(peer_addr
, &asoc
->peer
.transport_addr_list
,
3010 path_sum
+= peer_addr
->pathmaxrxt
;
3014 /* Only validate asocmaxrxt if we have more than
3015 * one path/transport. We do this because path
3016 * retransmissions are only counted when we have more
3020 assocparams
.sasoc_asocmaxrxt
> path_sum
)
3023 asoc
->max_retrans
= assocparams
.sasoc_asocmaxrxt
;
3026 if (assocparams
.sasoc_cookie_life
!= 0)
3027 asoc
->cookie_life
= ms_to_ktime(assocparams
.sasoc_cookie_life
);
3029 /* Set the values to the endpoint */
3030 struct sctp_sock
*sp
= sctp_sk(sk
);
3032 if (assocparams
.sasoc_asocmaxrxt
!= 0)
3033 sp
->assocparams
.sasoc_asocmaxrxt
=
3034 assocparams
.sasoc_asocmaxrxt
;
3035 if (assocparams
.sasoc_cookie_life
!= 0)
3036 sp
->assocparams
.sasoc_cookie_life
=
3037 assocparams
.sasoc_cookie_life
;
3043 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3045 * This socket option is a boolean flag which turns on or off mapped V4
3046 * addresses. If this option is turned on and the socket is type
3047 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3048 * If this option is turned off, then no mapping will be done of V4
3049 * addresses and a user will receive both PF_INET6 and PF_INET type
3050 * addresses on the socket.
3052 static int sctp_setsockopt_mappedv4(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
3055 struct sctp_sock
*sp
= sctp_sk(sk
);
3057 if (optlen
< sizeof(int))
3059 if (get_user(val
, (int __user
*)optval
))
3070 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3071 * This option will get or set the maximum size to put in any outgoing
3072 * SCTP DATA chunk. If a message is larger than this size it will be
3073 * fragmented by SCTP into the specified size. Note that the underlying
3074 * SCTP implementation may fragment into smaller sized chunks when the
3075 * PMTU of the underlying association is smaller than the value set by
3076 * the user. The default value for this option is '0' which indicates
3077 * the user is NOT limiting fragmentation and only the PMTU will effect
3078 * SCTP's choice of DATA chunk size. Note also that values set larger
3079 * than the maximum size of an IP datagram will effectively let SCTP
3080 * control fragmentation (i.e. the same as setting this option to 0).
3082 * The following structure is used to access and modify this parameter:
3084 * struct sctp_assoc_value {
3085 * sctp_assoc_t assoc_id;
3086 * uint32_t assoc_value;
3089 * assoc_id: This parameter is ignored for one-to-one style sockets.
3090 * For one-to-many style sockets this parameter indicates which
3091 * association the user is performing an action upon. Note that if
3092 * this field's value is zero then the endpoints default value is
3093 * changed (effecting future associations only).
3094 * assoc_value: This parameter specifies the maximum size in bytes.
3096 static int sctp_setsockopt_maxseg(struct sock
*sk
, char __user
*optval
, unsigned int optlen
)
3098 struct sctp_assoc_value params
;
3099 struct sctp_association
*asoc
;
3100 struct sctp_sock
*sp
= sctp_sk(sk
);
3103 if (optlen
== sizeof(int)) {
3104 pr_warn_ratelimited(DEPRECATED
3106 "Use of int in maxseg socket option.\n"
3107 "Use struct sctp_assoc_value instead\n",
3108 current
->comm
, task_pid_nr(current
));
3109 if (copy_from_user(&val
, optval
, optlen
))
3111 params
.assoc_id
= 0;
3112 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3113 if (copy_from_user(¶ms
, optval
, optlen
))
3115 val
= params
.assoc_value
;
3119 if ((val
!= 0) && ((val
< 8) || (val
> SCTP_MAX_CHUNK_LEN
)))
3122 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3123 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
3128 val
= asoc
->pathmtu
;
3129 val
-= sp
->pf
->af
->net_header_len
;
3130 val
-= sizeof(struct sctphdr
) +
3131 sizeof(struct sctp_data_chunk
);
3133 asoc
->user_frag
= val
;
3134 asoc
->frag_point
= sctp_frag_point(asoc
, asoc
->pathmtu
);
3136 sp
->user_frag
= val
;
3144 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3146 * Requests that the peer mark the enclosed address as the association
3147 * primary. The enclosed address must be one of the association's
3148 * locally bound addresses. The following structure is used to make a
3149 * set primary request:
3151 static int sctp_setsockopt_peer_primary_addr(struct sock
*sk
, char __user
*optval
,
3152 unsigned int optlen
)
3154 struct net
*net
= sock_net(sk
);
3155 struct sctp_sock
*sp
;
3156 struct sctp_association
*asoc
= NULL
;
3157 struct sctp_setpeerprim prim
;
3158 struct sctp_chunk
*chunk
;
3164 if (!net
->sctp
.addip_enable
)
3167 if (optlen
!= sizeof(struct sctp_setpeerprim
))
3170 if (copy_from_user(&prim
, optval
, optlen
))
3173 asoc
= sctp_id2assoc(sk
, prim
.sspp_assoc_id
);
3177 if (!asoc
->peer
.asconf_capable
)
3180 if (asoc
->peer
.addip_disabled_mask
& SCTP_PARAM_SET_PRIMARY
)
3183 if (!sctp_state(asoc
, ESTABLISHED
))
3186 af
= sctp_get_af_specific(prim
.sspp_addr
.ss_family
);
3190 if (!af
->addr_valid((union sctp_addr
*)&prim
.sspp_addr
, sp
, NULL
))
3191 return -EADDRNOTAVAIL
;
3193 if (!sctp_assoc_lookup_laddr(asoc
, (union sctp_addr
*)&prim
.sspp_addr
))
3194 return -EADDRNOTAVAIL
;
3196 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3197 chunk
= sctp_make_asconf_set_prim(asoc
,
3198 (union sctp_addr
*)&prim
.sspp_addr
);
3202 err
= sctp_send_asconf(asoc
, chunk
);
3204 pr_debug("%s: we set peer primary addr primitively\n", __func__
);
3209 static int sctp_setsockopt_adaptation_layer(struct sock
*sk
, char __user
*optval
,
3210 unsigned int optlen
)
3212 struct sctp_setadaptation adaptation
;
3214 if (optlen
!= sizeof(struct sctp_setadaptation
))
3216 if (copy_from_user(&adaptation
, optval
, optlen
))
3219 sctp_sk(sk
)->adaptation_ind
= adaptation
.ssb_adaptation_ind
;
3225 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3227 * The context field in the sctp_sndrcvinfo structure is normally only
3228 * used when a failed message is retrieved holding the value that was
3229 * sent down on the actual send call. This option allows the setting of
3230 * a default context on an association basis that will be received on
3231 * reading messages from the peer. This is especially helpful in the
3232 * one-2-many model for an application to keep some reference to an
3233 * internal state machine that is processing messages on the
3234 * association. Note that the setting of this value only effects
3235 * received messages from the peer and does not effect the value that is
3236 * saved with outbound messages.
3238 static int sctp_setsockopt_context(struct sock
*sk
, char __user
*optval
,
3239 unsigned int optlen
)
3241 struct sctp_assoc_value params
;
3242 struct sctp_sock
*sp
;
3243 struct sctp_association
*asoc
;
3245 if (optlen
!= sizeof(struct sctp_assoc_value
))
3247 if (copy_from_user(¶ms
, optval
, optlen
))
3252 if (params
.assoc_id
!= 0) {
3253 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3256 asoc
->default_rcv_context
= params
.assoc_value
;
3258 sp
->default_rcv_context
= params
.assoc_value
;
3265 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3267 * This options will at a minimum specify if the implementation is doing
3268 * fragmented interleave. Fragmented interleave, for a one to many
3269 * socket, is when subsequent calls to receive a message may return
3270 * parts of messages from different associations. Some implementations
3271 * may allow you to turn this value on or off. If so, when turned off,
3272 * no fragment interleave will occur (which will cause a head of line
3273 * blocking amongst multiple associations sharing the same one to many
3274 * socket). When this option is turned on, then each receive call may
3275 * come from a different association (thus the user must receive data
3276 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3277 * association each receive belongs to.
3279 * This option takes a boolean value. A non-zero value indicates that
3280 * fragmented interleave is on. A value of zero indicates that
3281 * fragmented interleave is off.
3283 * Note that it is important that an implementation that allows this
3284 * option to be turned on, have it off by default. Otherwise an unaware
3285 * application using the one to many model may become confused and act
3288 static int sctp_setsockopt_fragment_interleave(struct sock
*sk
,
3289 char __user
*optval
,
3290 unsigned int optlen
)
3294 if (optlen
!= sizeof(int))
3296 if (get_user(val
, (int __user
*)optval
))
3299 sctp_sk(sk
)->frag_interleave
= (val
== 0) ? 0 : 1;
3305 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3306 * (SCTP_PARTIAL_DELIVERY_POINT)
3308 * This option will set or get the SCTP partial delivery point. This
3309 * point is the size of a message where the partial delivery API will be
3310 * invoked to help free up rwnd space for the peer. Setting this to a
3311 * lower value will cause partial deliveries to happen more often. The
3312 * calls argument is an integer that sets or gets the partial delivery
3313 * point. Note also that the call will fail if the user attempts to set
3314 * this value larger than the socket receive buffer size.
3316 * Note that any single message having a length smaller than or equal to
3317 * the SCTP partial delivery point will be delivered in one single read
3318 * call as long as the user provided buffer is large enough to hold the
3321 static int sctp_setsockopt_partial_delivery_point(struct sock
*sk
,
3322 char __user
*optval
,
3323 unsigned int optlen
)
3327 if (optlen
!= sizeof(u32
))
3329 if (get_user(val
, (int __user
*)optval
))
3332 /* Note: We double the receive buffer from what the user sets
3333 * it to be, also initial rwnd is based on rcvbuf/2.
3335 if (val
> (sk
->sk_rcvbuf
>> 1))
3338 sctp_sk(sk
)->pd_point
= val
;
3340 return 0; /* is this the right error code? */
3344 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3346 * This option will allow a user to change the maximum burst of packets
3347 * that can be emitted by this association. Note that the default value
3348 * is 4, and some implementations may restrict this setting so that it
3349 * can only be lowered.
3351 * NOTE: This text doesn't seem right. Do this on a socket basis with
3352 * future associations inheriting the socket value.
3354 static int sctp_setsockopt_maxburst(struct sock
*sk
,
3355 char __user
*optval
,
3356 unsigned int optlen
)
3358 struct sctp_assoc_value params
;
3359 struct sctp_sock
*sp
;
3360 struct sctp_association
*asoc
;
3364 if (optlen
== sizeof(int)) {
3365 pr_warn_ratelimited(DEPRECATED
3367 "Use of int in max_burst socket option deprecated.\n"
3368 "Use struct sctp_assoc_value instead\n",
3369 current
->comm
, task_pid_nr(current
));
3370 if (copy_from_user(&val
, optval
, optlen
))
3372 } else if (optlen
== sizeof(struct sctp_assoc_value
)) {
3373 if (copy_from_user(¶ms
, optval
, optlen
))
3375 val
= params
.assoc_value
;
3376 assoc_id
= params
.assoc_id
;
3382 if (assoc_id
!= 0) {
3383 asoc
= sctp_id2assoc(sk
, assoc_id
);
3386 asoc
->max_burst
= val
;
3388 sp
->max_burst
= val
;
3394 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3396 * This set option adds a chunk type that the user is requesting to be
3397 * received only in an authenticated way. Changes to the list of chunks
3398 * will only effect future associations on the socket.
3400 static int sctp_setsockopt_auth_chunk(struct sock
*sk
,
3401 char __user
*optval
,
3402 unsigned int optlen
)
3404 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3405 struct sctp_authchunk val
;
3407 if (!ep
->auth_enable
)
3410 if (optlen
!= sizeof(struct sctp_authchunk
))
3412 if (copy_from_user(&val
, optval
, optlen
))
3415 switch (val
.sauth_chunk
) {
3417 case SCTP_CID_INIT_ACK
:
3418 case SCTP_CID_SHUTDOWN_COMPLETE
:
3423 /* add this chunk id to the endpoint */
3424 return sctp_auth_ep_add_chunkid(ep
, val
.sauth_chunk
);
3428 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3430 * This option gets or sets the list of HMAC algorithms that the local
3431 * endpoint requires the peer to use.
3433 static int sctp_setsockopt_hmac_ident(struct sock
*sk
,
3434 char __user
*optval
,
3435 unsigned int optlen
)
3437 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3438 struct sctp_hmacalgo
*hmacs
;
3442 if (!ep
->auth_enable
)
3445 if (optlen
< sizeof(struct sctp_hmacalgo
))
3448 hmacs
= memdup_user(optval
, optlen
);
3450 return PTR_ERR(hmacs
);
3452 idents
= hmacs
->shmac_num_idents
;
3453 if (idents
== 0 || idents
> SCTP_AUTH_NUM_HMACS
||
3454 (idents
* sizeof(u16
)) > (optlen
- sizeof(struct sctp_hmacalgo
))) {
3459 err
= sctp_auth_ep_set_hmacs(ep
, hmacs
);
3466 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3468 * This option will set a shared secret key which is used to build an
3469 * association shared key.
3471 static int sctp_setsockopt_auth_key(struct sock
*sk
,
3472 char __user
*optval
,
3473 unsigned int optlen
)
3475 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3476 struct sctp_authkey
*authkey
;
3477 struct sctp_association
*asoc
;
3480 if (!ep
->auth_enable
)
3483 if (optlen
<= sizeof(struct sctp_authkey
))
3486 authkey
= memdup_user(optval
, optlen
);
3487 if (IS_ERR(authkey
))
3488 return PTR_ERR(authkey
);
3490 if (authkey
->sca_keylength
> optlen
- sizeof(struct sctp_authkey
)) {
3495 asoc
= sctp_id2assoc(sk
, authkey
->sca_assoc_id
);
3496 if (!asoc
&& authkey
->sca_assoc_id
&& sctp_style(sk
, UDP
)) {
3501 ret
= sctp_auth_set_key(ep
, asoc
, authkey
);
3508 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3510 * This option will get or set the active shared key to be used to build
3511 * the association shared key.
3513 static int sctp_setsockopt_active_key(struct sock
*sk
,
3514 char __user
*optval
,
3515 unsigned int optlen
)
3517 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3518 struct sctp_authkeyid val
;
3519 struct sctp_association
*asoc
;
3521 if (!ep
->auth_enable
)
3524 if (optlen
!= sizeof(struct sctp_authkeyid
))
3526 if (copy_from_user(&val
, optval
, optlen
))
3529 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3530 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3533 return sctp_auth_set_active_key(ep
, asoc
, val
.scact_keynumber
);
3537 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3539 * This set option will delete a shared secret key from use.
3541 static int sctp_setsockopt_del_key(struct sock
*sk
,
3542 char __user
*optval
,
3543 unsigned int optlen
)
3545 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
3546 struct sctp_authkeyid val
;
3547 struct sctp_association
*asoc
;
3549 if (!ep
->auth_enable
)
3552 if (optlen
!= sizeof(struct sctp_authkeyid
))
3554 if (copy_from_user(&val
, optval
, optlen
))
3557 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
3558 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
3561 return sctp_auth_del_key_id(ep
, asoc
, val
.scact_keynumber
);
3566 * 8.1.23 SCTP_AUTO_ASCONF
3568 * This option will enable or disable the use of the automatic generation of
3569 * ASCONF chunks to add and delete addresses to an existing association. Note
3570 * that this option has two caveats namely: a) it only affects sockets that
3571 * are bound to all addresses available to the SCTP stack, and b) the system
3572 * administrator may have an overriding control that turns the ASCONF feature
3573 * off no matter what setting the socket option may have.
3574 * This option expects an integer boolean flag, where a non-zero value turns on
3575 * the option, and a zero value turns off the option.
3576 * Note. In this implementation, socket operation overrides default parameter
3577 * being set by sysctl as well as FreeBSD implementation
3579 static int sctp_setsockopt_auto_asconf(struct sock
*sk
, char __user
*optval
,
3580 unsigned int optlen
)
3583 struct sctp_sock
*sp
= sctp_sk(sk
);
3585 if (optlen
< sizeof(int))
3587 if (get_user(val
, (int __user
*)optval
))
3589 if (!sctp_is_ep_boundall(sk
) && val
)
3591 if ((val
&& sp
->do_auto_asconf
) || (!val
&& !sp
->do_auto_asconf
))
3594 spin_lock_bh(&sock_net(sk
)->sctp
.addr_wq_lock
);
3595 if (val
== 0 && sp
->do_auto_asconf
) {
3596 list_del(&sp
->auto_asconf_list
);
3597 sp
->do_auto_asconf
= 0;
3598 } else if (val
&& !sp
->do_auto_asconf
) {
3599 list_add_tail(&sp
->auto_asconf_list
,
3600 &sock_net(sk
)->sctp
.auto_asconf_splist
);
3601 sp
->do_auto_asconf
= 1;
3603 spin_unlock_bh(&sock_net(sk
)->sctp
.addr_wq_lock
);
3608 * SCTP_PEER_ADDR_THLDS
3610 * This option allows us to alter the partially failed threshold for one or all
3611 * transports in an association. See Section 6.1 of:
3612 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3614 static int sctp_setsockopt_paddr_thresholds(struct sock
*sk
,
3615 char __user
*optval
,
3616 unsigned int optlen
)
3618 struct sctp_paddrthlds val
;
3619 struct sctp_transport
*trans
;
3620 struct sctp_association
*asoc
;
3622 if (optlen
< sizeof(struct sctp_paddrthlds
))
3624 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
,
3625 sizeof(struct sctp_paddrthlds
)))
3629 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
3630 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
3633 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
3635 if (val
.spt_pathmaxrxt
)
3636 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3637 trans
->pf_retrans
= val
.spt_pathpfthld
;
3640 if (val
.spt_pathmaxrxt
)
3641 asoc
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3642 asoc
->pf_retrans
= val
.spt_pathpfthld
;
3644 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
3649 if (val
.spt_pathmaxrxt
)
3650 trans
->pathmaxrxt
= val
.spt_pathmaxrxt
;
3651 trans
->pf_retrans
= val
.spt_pathpfthld
;
3657 static int sctp_setsockopt_recvrcvinfo(struct sock
*sk
,
3658 char __user
*optval
,
3659 unsigned int optlen
)
3663 if (optlen
< sizeof(int))
3665 if (get_user(val
, (int __user
*) optval
))
3668 sctp_sk(sk
)->recvrcvinfo
= (val
== 0) ? 0 : 1;
3673 static int sctp_setsockopt_recvnxtinfo(struct sock
*sk
,
3674 char __user
*optval
,
3675 unsigned int optlen
)
3679 if (optlen
< sizeof(int))
3681 if (get_user(val
, (int __user
*) optval
))
3684 sctp_sk(sk
)->recvnxtinfo
= (val
== 0) ? 0 : 1;
3689 static int sctp_setsockopt_pr_supported(struct sock
*sk
,
3690 char __user
*optval
,
3691 unsigned int optlen
)
3693 struct sctp_assoc_value params
;
3694 struct sctp_association
*asoc
;
3695 int retval
= -EINVAL
;
3697 if (optlen
!= sizeof(params
))
3700 if (copy_from_user(¶ms
, optval
, optlen
)) {
3705 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3707 asoc
->prsctp_enable
= !!params
.assoc_value
;
3708 } else if (!params
.assoc_id
) {
3709 struct sctp_sock
*sp
= sctp_sk(sk
);
3711 sp
->ep
->prsctp_enable
= !!params
.assoc_value
;
3722 static int sctp_setsockopt_default_prinfo(struct sock
*sk
,
3723 char __user
*optval
,
3724 unsigned int optlen
)
3726 struct sctp_default_prinfo info
;
3727 struct sctp_association
*asoc
;
3728 int retval
= -EINVAL
;
3730 if (optlen
!= sizeof(info
))
3733 if (copy_from_user(&info
, optval
, sizeof(info
))) {
3738 if (info
.pr_policy
& ~SCTP_PR_SCTP_MASK
)
3741 if (info
.pr_policy
== SCTP_PR_SCTP_NONE
)
3744 asoc
= sctp_id2assoc(sk
, info
.pr_assoc_id
);
3746 SCTP_PR_SET_POLICY(asoc
->default_flags
, info
.pr_policy
);
3747 asoc
->default_timetolive
= info
.pr_value
;
3748 } else if (!info
.pr_assoc_id
) {
3749 struct sctp_sock
*sp
= sctp_sk(sk
);
3751 SCTP_PR_SET_POLICY(sp
->default_flags
, info
.pr_policy
);
3752 sp
->default_timetolive
= info
.pr_value
;
3763 static int sctp_setsockopt_reconfig_supported(struct sock
*sk
,
3764 char __user
*optval
,
3765 unsigned int optlen
)
3767 struct sctp_assoc_value params
;
3768 struct sctp_association
*asoc
;
3769 int retval
= -EINVAL
;
3771 if (optlen
!= sizeof(params
))
3774 if (copy_from_user(¶ms
, optval
, optlen
)) {
3779 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3781 asoc
->reconf_enable
= !!params
.assoc_value
;
3782 } else if (!params
.assoc_id
) {
3783 struct sctp_sock
*sp
= sctp_sk(sk
);
3785 sp
->ep
->reconf_enable
= !!params
.assoc_value
;
3796 static int sctp_setsockopt_enable_strreset(struct sock
*sk
,
3797 char __user
*optval
,
3798 unsigned int optlen
)
3800 struct sctp_assoc_value params
;
3801 struct sctp_association
*asoc
;
3802 int retval
= -EINVAL
;
3804 if (optlen
!= sizeof(params
))
3807 if (copy_from_user(¶ms
, optval
, optlen
)) {
3812 if (params
.assoc_value
& (~SCTP_ENABLE_STRRESET_MASK
))
3815 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
3817 asoc
->strreset_enable
= params
.assoc_value
;
3818 } else if (!params
.assoc_id
) {
3819 struct sctp_sock
*sp
= sctp_sk(sk
);
3821 sp
->ep
->strreset_enable
= params
.assoc_value
;
3832 static int sctp_setsockopt_reset_streams(struct sock
*sk
,
3833 char __user
*optval
,
3834 unsigned int optlen
)
3836 struct sctp_reset_streams
*params
;
3837 struct sctp_association
*asoc
;
3838 int retval
= -EINVAL
;
3840 if (optlen
< sizeof(struct sctp_reset_streams
))
3843 params
= memdup_user(optval
, optlen
);
3845 return PTR_ERR(params
);
3847 asoc
= sctp_id2assoc(sk
, params
->srs_assoc_id
);
3851 retval
= sctp_send_reset_streams(asoc
, params
);
3858 static int sctp_setsockopt_reset_assoc(struct sock
*sk
,
3859 char __user
*optval
,
3860 unsigned int optlen
)
3862 struct sctp_association
*asoc
;
3863 sctp_assoc_t associd
;
3864 int retval
= -EINVAL
;
3866 if (optlen
!= sizeof(associd
))
3869 if (copy_from_user(&associd
, optval
, optlen
)) {
3874 asoc
= sctp_id2assoc(sk
, associd
);
3878 retval
= sctp_send_reset_assoc(asoc
);
3884 static int sctp_setsockopt_add_streams(struct sock
*sk
,
3885 char __user
*optval
,
3886 unsigned int optlen
)
3888 struct sctp_association
*asoc
;
3889 struct sctp_add_streams params
;
3890 int retval
= -EINVAL
;
3892 if (optlen
!= sizeof(params
))
3895 if (copy_from_user(¶ms
, optval
, optlen
)) {
3900 asoc
= sctp_id2assoc(sk
, params
.sas_assoc_id
);
3904 retval
= sctp_send_add_streams(asoc
, ¶ms
);
3910 /* API 6.2 setsockopt(), getsockopt()
3912 * Applications use setsockopt() and getsockopt() to set or retrieve
3913 * socket options. Socket options are used to change the default
3914 * behavior of sockets calls. They are described in Section 7.
3918 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3919 * int __user *optlen);
3920 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3923 * sd - the socket descript.
3924 * level - set to IPPROTO_SCTP for all SCTP options.
3925 * optname - the option name.
3926 * optval - the buffer to store the value of the option.
3927 * optlen - the size of the buffer.
3929 static int sctp_setsockopt(struct sock
*sk
, int level
, int optname
,
3930 char __user
*optval
, unsigned int optlen
)
3934 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
3936 /* I can hardly begin to describe how wrong this is. This is
3937 * so broken as to be worse than useless. The API draft
3938 * REALLY is NOT helpful here... I am not convinced that the
3939 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3940 * are at all well-founded.
3942 if (level
!= SOL_SCTP
) {
3943 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
3944 retval
= af
->setsockopt(sk
, level
, optname
, optval
, optlen
);
3951 case SCTP_SOCKOPT_BINDX_ADD
:
3952 /* 'optlen' is the size of the addresses buffer. */
3953 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3954 optlen
, SCTP_BINDX_ADD_ADDR
);
3957 case SCTP_SOCKOPT_BINDX_REM
:
3958 /* 'optlen' is the size of the addresses buffer. */
3959 retval
= sctp_setsockopt_bindx(sk
, (struct sockaddr __user
*)optval
,
3960 optlen
, SCTP_BINDX_REM_ADDR
);
3963 case SCTP_SOCKOPT_CONNECTX_OLD
:
3964 /* 'optlen' is the size of the addresses buffer. */
3965 retval
= sctp_setsockopt_connectx_old(sk
,
3966 (struct sockaddr __user
*)optval
,
3970 case SCTP_SOCKOPT_CONNECTX
:
3971 /* 'optlen' is the size of the addresses buffer. */
3972 retval
= sctp_setsockopt_connectx(sk
,
3973 (struct sockaddr __user
*)optval
,
3977 case SCTP_DISABLE_FRAGMENTS
:
3978 retval
= sctp_setsockopt_disable_fragments(sk
, optval
, optlen
);
3982 retval
= sctp_setsockopt_events(sk
, optval
, optlen
);
3985 case SCTP_AUTOCLOSE
:
3986 retval
= sctp_setsockopt_autoclose(sk
, optval
, optlen
);
3989 case SCTP_PEER_ADDR_PARAMS
:
3990 retval
= sctp_setsockopt_peer_addr_params(sk
, optval
, optlen
);
3993 case SCTP_DELAYED_SACK
:
3994 retval
= sctp_setsockopt_delayed_ack(sk
, optval
, optlen
);
3996 case SCTP_PARTIAL_DELIVERY_POINT
:
3997 retval
= sctp_setsockopt_partial_delivery_point(sk
, optval
, optlen
);
4001 retval
= sctp_setsockopt_initmsg(sk
, optval
, optlen
);
4003 case SCTP_DEFAULT_SEND_PARAM
:
4004 retval
= sctp_setsockopt_default_send_param(sk
, optval
,
4007 case SCTP_DEFAULT_SNDINFO
:
4008 retval
= sctp_setsockopt_default_sndinfo(sk
, optval
, optlen
);
4010 case SCTP_PRIMARY_ADDR
:
4011 retval
= sctp_setsockopt_primary_addr(sk
, optval
, optlen
);
4013 case SCTP_SET_PEER_PRIMARY_ADDR
:
4014 retval
= sctp_setsockopt_peer_primary_addr(sk
, optval
, optlen
);
4017 retval
= sctp_setsockopt_nodelay(sk
, optval
, optlen
);
4020 retval
= sctp_setsockopt_rtoinfo(sk
, optval
, optlen
);
4022 case SCTP_ASSOCINFO
:
4023 retval
= sctp_setsockopt_associnfo(sk
, optval
, optlen
);
4025 case SCTP_I_WANT_MAPPED_V4_ADDR
:
4026 retval
= sctp_setsockopt_mappedv4(sk
, optval
, optlen
);
4029 retval
= sctp_setsockopt_maxseg(sk
, optval
, optlen
);
4031 case SCTP_ADAPTATION_LAYER
:
4032 retval
= sctp_setsockopt_adaptation_layer(sk
, optval
, optlen
);
4035 retval
= sctp_setsockopt_context(sk
, optval
, optlen
);
4037 case SCTP_FRAGMENT_INTERLEAVE
:
4038 retval
= sctp_setsockopt_fragment_interleave(sk
, optval
, optlen
);
4040 case SCTP_MAX_BURST
:
4041 retval
= sctp_setsockopt_maxburst(sk
, optval
, optlen
);
4043 case SCTP_AUTH_CHUNK
:
4044 retval
= sctp_setsockopt_auth_chunk(sk
, optval
, optlen
);
4046 case SCTP_HMAC_IDENT
:
4047 retval
= sctp_setsockopt_hmac_ident(sk
, optval
, optlen
);
4050 retval
= sctp_setsockopt_auth_key(sk
, optval
, optlen
);
4052 case SCTP_AUTH_ACTIVE_KEY
:
4053 retval
= sctp_setsockopt_active_key(sk
, optval
, optlen
);
4055 case SCTP_AUTH_DELETE_KEY
:
4056 retval
= sctp_setsockopt_del_key(sk
, optval
, optlen
);
4058 case SCTP_AUTO_ASCONF
:
4059 retval
= sctp_setsockopt_auto_asconf(sk
, optval
, optlen
);
4061 case SCTP_PEER_ADDR_THLDS
:
4062 retval
= sctp_setsockopt_paddr_thresholds(sk
, optval
, optlen
);
4064 case SCTP_RECVRCVINFO
:
4065 retval
= sctp_setsockopt_recvrcvinfo(sk
, optval
, optlen
);
4067 case SCTP_RECVNXTINFO
:
4068 retval
= sctp_setsockopt_recvnxtinfo(sk
, optval
, optlen
);
4070 case SCTP_PR_SUPPORTED
:
4071 retval
= sctp_setsockopt_pr_supported(sk
, optval
, optlen
);
4073 case SCTP_DEFAULT_PRINFO
:
4074 retval
= sctp_setsockopt_default_prinfo(sk
, optval
, optlen
);
4076 case SCTP_RECONFIG_SUPPORTED
:
4077 retval
= sctp_setsockopt_reconfig_supported(sk
, optval
, optlen
);
4079 case SCTP_ENABLE_STREAM_RESET
:
4080 retval
= sctp_setsockopt_enable_strreset(sk
, optval
, optlen
);
4082 case SCTP_RESET_STREAMS
:
4083 retval
= sctp_setsockopt_reset_streams(sk
, optval
, optlen
);
4085 case SCTP_RESET_ASSOC
:
4086 retval
= sctp_setsockopt_reset_assoc(sk
, optval
, optlen
);
4088 case SCTP_ADD_STREAMS
:
4089 retval
= sctp_setsockopt_add_streams(sk
, optval
, optlen
);
4092 retval
= -ENOPROTOOPT
;
4102 /* API 3.1.6 connect() - UDP Style Syntax
4104 * An application may use the connect() call in the UDP model to initiate an
4105 * association without sending data.
4109 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4111 * sd: the socket descriptor to have a new association added to.
4113 * nam: the address structure (either struct sockaddr_in or struct
4114 * sockaddr_in6 defined in RFC2553 [7]).
4116 * len: the size of the address.
4118 static int sctp_connect(struct sock
*sk
, struct sockaddr
*addr
,
4126 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__
, sk
,
4129 /* Validate addr_len before calling common connect/connectx routine. */
4130 af
= sctp_get_af_specific(addr
->sa_family
);
4131 if (!af
|| addr_len
< af
->sockaddr_len
) {
4134 /* Pass correct addr len to common routine (so it knows there
4135 * is only one address being passed.
4137 err
= __sctp_connect(sk
, addr
, af
->sockaddr_len
, NULL
);
4144 /* FIXME: Write comments. */
4145 static int sctp_disconnect(struct sock
*sk
, int flags
)
4147 return -EOPNOTSUPP
; /* STUB */
4150 /* 4.1.4 accept() - TCP Style Syntax
4152 * Applications use accept() call to remove an established SCTP
4153 * association from the accept queue of the endpoint. A new socket
4154 * descriptor will be returned from accept() to represent the newly
4155 * formed association.
4157 static struct sock
*sctp_accept(struct sock
*sk
, int flags
, int *err
, bool kern
)
4159 struct sctp_sock
*sp
;
4160 struct sctp_endpoint
*ep
;
4161 struct sock
*newsk
= NULL
;
4162 struct sctp_association
*asoc
;
4171 if (!sctp_style(sk
, TCP
)) {
4172 error
= -EOPNOTSUPP
;
4176 if (!sctp_sstate(sk
, LISTENING
)) {
4181 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
4183 error
= sctp_wait_for_accept(sk
, timeo
);
4187 /* We treat the list of associations on the endpoint as the accept
4188 * queue and pick the first association on the list.
4190 asoc
= list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
4192 newsk
= sp
->pf
->create_accept_sk(sk
, asoc
, kern
);
4198 /* Populate the fields of the newsk from the oldsk and migrate the
4199 * asoc to the newsk.
4201 sctp_sock_migrate(sk
, newsk
, asoc
, SCTP_SOCKET_TCP
);
4209 /* The SCTP ioctl handler. */
4210 static int sctp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
4217 * SEQPACKET-style sockets in LISTENING state are valid, for
4218 * SCTP, so only discard TCP-style sockets in LISTENING state.
4220 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
4225 struct sk_buff
*skb
;
4226 unsigned int amount
= 0;
4228 skb
= skb_peek(&sk
->sk_receive_queue
);
4231 * We will only return the amount of this packet since
4232 * that is all that will be read.
4236 rc
= put_user(amount
, (int __user
*)arg
);
4248 /* This is the function which gets called during socket creation to
4249 * initialized the SCTP-specific portion of the sock.
4250 * The sock structure should already be zero-filled memory.
4252 static int sctp_init_sock(struct sock
*sk
)
4254 struct net
*net
= sock_net(sk
);
4255 struct sctp_sock
*sp
;
4257 pr_debug("%s: sk:%p\n", __func__
, sk
);
4261 /* Initialize the SCTP per socket area. */
4262 switch (sk
->sk_type
) {
4263 case SOCK_SEQPACKET
:
4264 sp
->type
= SCTP_SOCKET_UDP
;
4267 sp
->type
= SCTP_SOCKET_TCP
;
4270 return -ESOCKTNOSUPPORT
;
4273 sk
->sk_gso_type
= SKB_GSO_SCTP
;
4275 /* Initialize default send parameters. These parameters can be
4276 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4278 sp
->default_stream
= 0;
4279 sp
->default_ppid
= 0;
4280 sp
->default_flags
= 0;
4281 sp
->default_context
= 0;
4282 sp
->default_timetolive
= 0;
4284 sp
->default_rcv_context
= 0;
4285 sp
->max_burst
= net
->sctp
.max_burst
;
4287 sp
->sctp_hmac_alg
= net
->sctp
.sctp_hmac_alg
;
4289 /* Initialize default setup parameters. These parameters
4290 * can be modified with the SCTP_INITMSG socket option or
4291 * overridden by the SCTP_INIT CMSG.
4293 sp
->initmsg
.sinit_num_ostreams
= sctp_max_outstreams
;
4294 sp
->initmsg
.sinit_max_instreams
= sctp_max_instreams
;
4295 sp
->initmsg
.sinit_max_attempts
= net
->sctp
.max_retrans_init
;
4296 sp
->initmsg
.sinit_max_init_timeo
= net
->sctp
.rto_max
;
4298 /* Initialize default RTO related parameters. These parameters can
4299 * be modified for with the SCTP_RTOINFO socket option.
4301 sp
->rtoinfo
.srto_initial
= net
->sctp
.rto_initial
;
4302 sp
->rtoinfo
.srto_max
= net
->sctp
.rto_max
;
4303 sp
->rtoinfo
.srto_min
= net
->sctp
.rto_min
;
4305 /* Initialize default association related parameters. These parameters
4306 * can be modified with the SCTP_ASSOCINFO socket option.
4308 sp
->assocparams
.sasoc_asocmaxrxt
= net
->sctp
.max_retrans_association
;
4309 sp
->assocparams
.sasoc_number_peer_destinations
= 0;
4310 sp
->assocparams
.sasoc_peer_rwnd
= 0;
4311 sp
->assocparams
.sasoc_local_rwnd
= 0;
4312 sp
->assocparams
.sasoc_cookie_life
= net
->sctp
.valid_cookie_life
;
4314 /* Initialize default event subscriptions. By default, all the
4317 memset(&sp
->subscribe
, 0, sizeof(struct sctp_event_subscribe
));
4319 /* Default Peer Address Parameters. These defaults can
4320 * be modified via SCTP_PEER_ADDR_PARAMS
4322 sp
->hbinterval
= net
->sctp
.hb_interval
;
4323 sp
->pathmaxrxt
= net
->sctp
.max_retrans_path
;
4324 sp
->pathmtu
= 0; /* allow default discovery */
4325 sp
->sackdelay
= net
->sctp
.sack_timeout
;
4327 sp
->param_flags
= SPP_HB_ENABLE
|
4329 SPP_SACKDELAY_ENABLE
;
4331 /* If enabled no SCTP message fragmentation will be performed.
4332 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4334 sp
->disable_fragments
= 0;
4336 /* Enable Nagle algorithm by default. */
4339 sp
->recvrcvinfo
= 0;
4340 sp
->recvnxtinfo
= 0;
4342 /* Enable by default. */
4345 /* Auto-close idle associations after the configured
4346 * number of seconds. A value of 0 disables this
4347 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4348 * for UDP-style sockets only.
4352 /* User specified fragmentation limit. */
4355 sp
->adaptation_ind
= 0;
4357 sp
->pf
= sctp_get_pf_specific(sk
->sk_family
);
4359 /* Control variables for partial data delivery. */
4360 atomic_set(&sp
->pd_mode
, 0);
4361 skb_queue_head_init(&sp
->pd_lobby
);
4362 sp
->frag_interleave
= 0;
4364 /* Create a per socket endpoint structure. Even if we
4365 * change the data structure relationships, this may still
4366 * be useful for storing pre-connect address information.
4368 sp
->ep
= sctp_endpoint_new(sk
, GFP_KERNEL
);
4374 sk
->sk_destruct
= sctp_destruct_sock
;
4376 SCTP_DBG_OBJCNT_INC(sock
);
4379 percpu_counter_inc(&sctp_sockets_allocated
);
4380 sock_prot_inuse_add(net
, sk
->sk_prot
, 1);
4382 /* Nothing can fail after this block, otherwise
4383 * sctp_destroy_sock() will be called without addr_wq_lock held
4385 if (net
->sctp
.default_auto_asconf
) {
4386 spin_lock(&sock_net(sk
)->sctp
.addr_wq_lock
);
4387 list_add_tail(&sp
->auto_asconf_list
,
4388 &net
->sctp
.auto_asconf_splist
);
4389 sp
->do_auto_asconf
= 1;
4390 spin_unlock(&sock_net(sk
)->sctp
.addr_wq_lock
);
4392 sp
->do_auto_asconf
= 0;
4400 /* Cleanup any SCTP per socket resources. Must be called with
4401 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4403 static void sctp_destroy_sock(struct sock
*sk
)
4405 struct sctp_sock
*sp
;
4407 pr_debug("%s: sk:%p\n", __func__
, sk
);
4409 /* Release our hold on the endpoint. */
4411 /* This could happen during socket init, thus we bail out
4412 * early, since the rest of the below is not setup either.
4417 if (sp
->do_auto_asconf
) {
4418 sp
->do_auto_asconf
= 0;
4419 list_del(&sp
->auto_asconf_list
);
4421 sctp_endpoint_free(sp
->ep
);
4423 percpu_counter_dec(&sctp_sockets_allocated
);
4424 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
4428 /* Triggered when there are no references on the socket anymore */
4429 static void sctp_destruct_sock(struct sock
*sk
)
4431 struct sctp_sock
*sp
= sctp_sk(sk
);
4433 /* Free up the HMAC transform. */
4434 crypto_free_shash(sp
->hmac
);
4436 inet_sock_destruct(sk
);
4439 /* API 4.1.7 shutdown() - TCP Style Syntax
4440 * int shutdown(int socket, int how);
4442 * sd - the socket descriptor of the association to be closed.
4443 * how - Specifies the type of shutdown. The values are
4446 * Disables further receive operations. No SCTP
4447 * protocol action is taken.
4449 * Disables further send operations, and initiates
4450 * the SCTP shutdown sequence.
4452 * Disables further send and receive operations
4453 * and initiates the SCTP shutdown sequence.
4455 static void sctp_shutdown(struct sock
*sk
, int how
)
4457 struct net
*net
= sock_net(sk
);
4458 struct sctp_endpoint
*ep
;
4460 if (!sctp_style(sk
, TCP
))
4463 ep
= sctp_sk(sk
)->ep
;
4464 if (how
& SEND_SHUTDOWN
&& !list_empty(&ep
->asocs
)) {
4465 struct sctp_association
*asoc
;
4467 sk
->sk_state
= SCTP_SS_CLOSING
;
4468 asoc
= list_entry(ep
->asocs
.next
,
4469 struct sctp_association
, asocs
);
4470 sctp_primitive_SHUTDOWN(net
, asoc
, NULL
);
4474 int sctp_get_sctp_info(struct sock
*sk
, struct sctp_association
*asoc
,
4475 struct sctp_info
*info
)
4477 struct sctp_transport
*prim
;
4478 struct list_head
*pos
;
4481 memset(info
, 0, sizeof(*info
));
4483 struct sctp_sock
*sp
= sctp_sk(sk
);
4485 info
->sctpi_s_autoclose
= sp
->autoclose
;
4486 info
->sctpi_s_adaptation_ind
= sp
->adaptation_ind
;
4487 info
->sctpi_s_pd_point
= sp
->pd_point
;
4488 info
->sctpi_s_nodelay
= sp
->nodelay
;
4489 info
->sctpi_s_disable_fragments
= sp
->disable_fragments
;
4490 info
->sctpi_s_v4mapped
= sp
->v4mapped
;
4491 info
->sctpi_s_frag_interleave
= sp
->frag_interleave
;
4492 info
->sctpi_s_type
= sp
->type
;
4497 info
->sctpi_tag
= asoc
->c
.my_vtag
;
4498 info
->sctpi_state
= asoc
->state
;
4499 info
->sctpi_rwnd
= asoc
->a_rwnd
;
4500 info
->sctpi_unackdata
= asoc
->unack_data
;
4501 info
->sctpi_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4502 info
->sctpi_instrms
= asoc
->stream
.incnt
;
4503 info
->sctpi_outstrms
= asoc
->stream
.outcnt
;
4504 list_for_each(pos
, &asoc
->base
.inqueue
.in_chunk_list
)
4505 info
->sctpi_inqueue
++;
4506 list_for_each(pos
, &asoc
->outqueue
.out_chunk_list
)
4507 info
->sctpi_outqueue
++;
4508 info
->sctpi_overall_error
= asoc
->overall_error_count
;
4509 info
->sctpi_max_burst
= asoc
->max_burst
;
4510 info
->sctpi_maxseg
= asoc
->frag_point
;
4511 info
->sctpi_peer_rwnd
= asoc
->peer
.rwnd
;
4512 info
->sctpi_peer_tag
= asoc
->c
.peer_vtag
;
4514 mask
= asoc
->peer
.ecn_capable
<< 1;
4515 mask
= (mask
| asoc
->peer
.ipv4_address
) << 1;
4516 mask
= (mask
| asoc
->peer
.ipv6_address
) << 1;
4517 mask
= (mask
| asoc
->peer
.hostname_address
) << 1;
4518 mask
= (mask
| asoc
->peer
.asconf_capable
) << 1;
4519 mask
= (mask
| asoc
->peer
.prsctp_capable
) << 1;
4520 mask
= (mask
| asoc
->peer
.auth_capable
);
4521 info
->sctpi_peer_capable
= mask
;
4522 mask
= asoc
->peer
.sack_needed
<< 1;
4523 mask
= (mask
| asoc
->peer
.sack_generation
) << 1;
4524 mask
= (mask
| asoc
->peer
.zero_window_announced
);
4525 info
->sctpi_peer_sack
= mask
;
4527 info
->sctpi_isacks
= asoc
->stats
.isacks
;
4528 info
->sctpi_osacks
= asoc
->stats
.osacks
;
4529 info
->sctpi_opackets
= asoc
->stats
.opackets
;
4530 info
->sctpi_ipackets
= asoc
->stats
.ipackets
;
4531 info
->sctpi_rtxchunks
= asoc
->stats
.rtxchunks
;
4532 info
->sctpi_outofseqtsns
= asoc
->stats
.outofseqtsns
;
4533 info
->sctpi_idupchunks
= asoc
->stats
.idupchunks
;
4534 info
->sctpi_gapcnt
= asoc
->stats
.gapcnt
;
4535 info
->sctpi_ouodchunks
= asoc
->stats
.ouodchunks
;
4536 info
->sctpi_iuodchunks
= asoc
->stats
.iuodchunks
;
4537 info
->sctpi_oodchunks
= asoc
->stats
.oodchunks
;
4538 info
->sctpi_iodchunks
= asoc
->stats
.iodchunks
;
4539 info
->sctpi_octrlchunks
= asoc
->stats
.octrlchunks
;
4540 info
->sctpi_ictrlchunks
= asoc
->stats
.ictrlchunks
;
4542 prim
= asoc
->peer
.primary_path
;
4543 memcpy(&info
->sctpi_p_address
, &prim
->ipaddr
, sizeof(prim
->ipaddr
));
4544 info
->sctpi_p_state
= prim
->state
;
4545 info
->sctpi_p_cwnd
= prim
->cwnd
;
4546 info
->sctpi_p_srtt
= prim
->srtt
;
4547 info
->sctpi_p_rto
= jiffies_to_msecs(prim
->rto
);
4548 info
->sctpi_p_hbinterval
= prim
->hbinterval
;
4549 info
->sctpi_p_pathmaxrxt
= prim
->pathmaxrxt
;
4550 info
->sctpi_p_sackdelay
= jiffies_to_msecs(prim
->sackdelay
);
4551 info
->sctpi_p_ssthresh
= prim
->ssthresh
;
4552 info
->sctpi_p_partial_bytes_acked
= prim
->partial_bytes_acked
;
4553 info
->sctpi_p_flight_size
= prim
->flight_size
;
4554 info
->sctpi_p_error
= prim
->error_count
;
4558 EXPORT_SYMBOL_GPL(sctp_get_sctp_info
);
4560 /* use callback to avoid exporting the core structure */
4561 int sctp_transport_walk_start(struct rhashtable_iter
*iter
)
4565 rhltable_walk_enter(&sctp_transport_hashtable
, iter
);
4567 err
= rhashtable_walk_start(iter
);
4568 if (err
&& err
!= -EAGAIN
) {
4569 rhashtable_walk_stop(iter
);
4570 rhashtable_walk_exit(iter
);
4577 void sctp_transport_walk_stop(struct rhashtable_iter
*iter
)
4579 rhashtable_walk_stop(iter
);
4580 rhashtable_walk_exit(iter
);
4583 struct sctp_transport
*sctp_transport_get_next(struct net
*net
,
4584 struct rhashtable_iter
*iter
)
4586 struct sctp_transport
*t
;
4588 t
= rhashtable_walk_next(iter
);
4589 for (; t
; t
= rhashtable_walk_next(iter
)) {
4591 if (PTR_ERR(t
) == -EAGAIN
)
4596 if (net_eq(sock_net(t
->asoc
->base
.sk
), net
) &&
4597 t
->asoc
->peer
.primary_path
== t
)
4604 struct sctp_transport
*sctp_transport_get_idx(struct net
*net
,
4605 struct rhashtable_iter
*iter
,
4608 void *obj
= SEQ_START_TOKEN
;
4610 while (pos
&& (obj
= sctp_transport_get_next(net
, iter
)) &&
4617 int sctp_for_each_endpoint(int (*cb
)(struct sctp_endpoint
*, void *),
4621 struct sctp_ep_common
*epb
;
4622 struct sctp_hashbucket
*head
;
4624 for (head
= sctp_ep_hashtable
; hash
< sctp_ep_hashsize
;
4626 read_lock_bh(&head
->lock
);
4627 sctp_for_each_hentry(epb
, &head
->chain
) {
4628 err
= cb(sctp_ep(epb
), p
);
4632 read_unlock_bh(&head
->lock
);
4637 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint
);
4639 int sctp_transport_lookup_process(int (*cb
)(struct sctp_transport
*, void *),
4641 const union sctp_addr
*laddr
,
4642 const union sctp_addr
*paddr
, void *p
)
4644 struct sctp_transport
*transport
;
4648 transport
= sctp_addrs_lookup_transport(net
, laddr
, paddr
);
4653 err
= cb(transport
, p
);
4654 sctp_transport_put(transport
);
4658 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process
);
4660 int sctp_for_each_transport(int (*cb
)(struct sctp_transport
*, void *),
4661 struct net
*net
, int pos
, void *p
) {
4662 struct rhashtable_iter hti
;
4666 err
= sctp_transport_walk_start(&hti
);
4670 obj
= sctp_transport_get_idx(net
, &hti
, pos
+ 1);
4671 for (; !IS_ERR_OR_NULL(obj
); obj
= sctp_transport_get_next(net
, &hti
)) {
4672 struct sctp_transport
*transport
= obj
;
4674 if (!sctp_transport_hold(transport
))
4676 err
= cb(transport
, p
);
4677 sctp_transport_put(transport
);
4681 sctp_transport_walk_stop(&hti
);
4685 EXPORT_SYMBOL_GPL(sctp_for_each_transport
);
4687 /* 7.2.1 Association Status (SCTP_STATUS)
4689 * Applications can retrieve current status information about an
4690 * association, including association state, peer receiver window size,
4691 * number of unacked data chunks, and number of data chunks pending
4692 * receipt. This information is read-only.
4694 static int sctp_getsockopt_sctp_status(struct sock
*sk
, int len
,
4695 char __user
*optval
,
4698 struct sctp_status status
;
4699 struct sctp_association
*asoc
= NULL
;
4700 struct sctp_transport
*transport
;
4701 sctp_assoc_t associd
;
4704 if (len
< sizeof(status
)) {
4709 len
= sizeof(status
);
4710 if (copy_from_user(&status
, optval
, len
)) {
4715 associd
= status
.sstat_assoc_id
;
4716 asoc
= sctp_id2assoc(sk
, associd
);
4722 transport
= asoc
->peer
.primary_path
;
4724 status
.sstat_assoc_id
= sctp_assoc2id(asoc
);
4725 status
.sstat_state
= sctp_assoc_to_state(asoc
);
4726 status
.sstat_rwnd
= asoc
->peer
.rwnd
;
4727 status
.sstat_unackdata
= asoc
->unack_data
;
4729 status
.sstat_penddata
= sctp_tsnmap_pending(&asoc
->peer
.tsn_map
);
4730 status
.sstat_instrms
= asoc
->stream
.incnt
;
4731 status
.sstat_outstrms
= asoc
->stream
.outcnt
;
4732 status
.sstat_fragmentation_point
= asoc
->frag_point
;
4733 status
.sstat_primary
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4734 memcpy(&status
.sstat_primary
.spinfo_address
, &transport
->ipaddr
,
4735 transport
->af_specific
->sockaddr_len
);
4736 /* Map ipv4 address into v4-mapped-on-v6 address. */
4737 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sctp_sk(sk
),
4738 (union sctp_addr
*)&status
.sstat_primary
.spinfo_address
);
4739 status
.sstat_primary
.spinfo_state
= transport
->state
;
4740 status
.sstat_primary
.spinfo_cwnd
= transport
->cwnd
;
4741 status
.sstat_primary
.spinfo_srtt
= transport
->srtt
;
4742 status
.sstat_primary
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4743 status
.sstat_primary
.spinfo_mtu
= transport
->pathmtu
;
4745 if (status
.sstat_primary
.spinfo_state
== SCTP_UNKNOWN
)
4746 status
.sstat_primary
.spinfo_state
= SCTP_ACTIVE
;
4748 if (put_user(len
, optlen
)) {
4753 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4754 __func__
, len
, status
.sstat_state
, status
.sstat_rwnd
,
4755 status
.sstat_assoc_id
);
4757 if (copy_to_user(optval
, &status
, len
)) {
4767 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4769 * Applications can retrieve information about a specific peer address
4770 * of an association, including its reachability state, congestion
4771 * window, and retransmission timer values. This information is
4774 static int sctp_getsockopt_peer_addr_info(struct sock
*sk
, int len
,
4775 char __user
*optval
,
4778 struct sctp_paddrinfo pinfo
;
4779 struct sctp_transport
*transport
;
4782 if (len
< sizeof(pinfo
)) {
4787 len
= sizeof(pinfo
);
4788 if (copy_from_user(&pinfo
, optval
, len
)) {
4793 transport
= sctp_addr_id2transport(sk
, &pinfo
.spinfo_address
,
4794 pinfo
.spinfo_assoc_id
);
4798 pinfo
.spinfo_assoc_id
= sctp_assoc2id(transport
->asoc
);
4799 pinfo
.spinfo_state
= transport
->state
;
4800 pinfo
.spinfo_cwnd
= transport
->cwnd
;
4801 pinfo
.spinfo_srtt
= transport
->srtt
;
4802 pinfo
.spinfo_rto
= jiffies_to_msecs(transport
->rto
);
4803 pinfo
.spinfo_mtu
= transport
->pathmtu
;
4805 if (pinfo
.spinfo_state
== SCTP_UNKNOWN
)
4806 pinfo
.spinfo_state
= SCTP_ACTIVE
;
4808 if (put_user(len
, optlen
)) {
4813 if (copy_to_user(optval
, &pinfo
, len
)) {
4822 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4824 * This option is a on/off flag. If enabled no SCTP message
4825 * fragmentation will be performed. Instead if a message being sent
4826 * exceeds the current PMTU size, the message will NOT be sent and
4827 * instead a error will be indicated to the user.
4829 static int sctp_getsockopt_disable_fragments(struct sock
*sk
, int len
,
4830 char __user
*optval
, int __user
*optlen
)
4834 if (len
< sizeof(int))
4838 val
= (sctp_sk(sk
)->disable_fragments
== 1);
4839 if (put_user(len
, optlen
))
4841 if (copy_to_user(optval
, &val
, len
))
4846 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4848 * This socket option is used to specify various notifications and
4849 * ancillary data the user wishes to receive.
4851 static int sctp_getsockopt_events(struct sock
*sk
, int len
, char __user
*optval
,
4856 if (len
> sizeof(struct sctp_event_subscribe
))
4857 len
= sizeof(struct sctp_event_subscribe
);
4858 if (put_user(len
, optlen
))
4860 if (copy_to_user(optval
, &sctp_sk(sk
)->subscribe
, len
))
4865 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4867 * This socket option is applicable to the UDP-style socket only. When
4868 * set it will cause associations that are idle for more than the
4869 * specified number of seconds to automatically close. An association
4870 * being idle is defined an association that has NOT sent or received
4871 * user data. The special value of '0' indicates that no automatic
4872 * close of any associations should be performed. The option expects an
4873 * integer defining the number of seconds of idle time before an
4874 * association is closed.
4876 static int sctp_getsockopt_autoclose(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4878 /* Applicable to UDP-style socket only */
4879 if (sctp_style(sk
, TCP
))
4881 if (len
< sizeof(int))
4884 if (put_user(len
, optlen
))
4886 if (copy_to_user(optval
, &sctp_sk(sk
)->autoclose
, sizeof(int)))
4891 /* Helper routine to branch off an association to a new socket. */
4892 int sctp_do_peeloff(struct sock
*sk
, sctp_assoc_t id
, struct socket
**sockp
)
4894 struct sctp_association
*asoc
= sctp_id2assoc(sk
, id
);
4895 struct sctp_sock
*sp
= sctp_sk(sk
);
4896 struct socket
*sock
;
4902 /* If there is a thread waiting on more sndbuf space for
4903 * sending on this asoc, it cannot be peeled.
4905 if (waitqueue_active(&asoc
->wait
))
4908 /* An association cannot be branched off from an already peeled-off
4909 * socket, nor is this supported for tcp style sockets.
4911 if (!sctp_style(sk
, UDP
))
4914 /* Create a new socket. */
4915 err
= sock_create(sk
->sk_family
, SOCK_SEQPACKET
, IPPROTO_SCTP
, &sock
);
4919 sctp_copy_sock(sock
->sk
, sk
, asoc
);
4921 /* Make peeled-off sockets more like 1-1 accepted sockets.
4922 * Set the daddr and initialize id to something more random
4924 sp
->pf
->to_sk_daddr(&asoc
->peer
.primary_addr
, sk
);
4926 /* Populate the fields of the newsk from the oldsk and migrate the
4927 * asoc to the newsk.
4929 sctp_sock_migrate(sk
, sock
->sk
, asoc
, SCTP_SOCKET_UDP_HIGH_BANDWIDTH
);
4935 EXPORT_SYMBOL(sctp_do_peeloff
);
4937 static int sctp_getsockopt_peeloff_common(struct sock
*sk
, sctp_peeloff_arg_t
*peeloff
,
4938 struct file
**newfile
, unsigned flags
)
4940 struct socket
*newsock
;
4943 retval
= sctp_do_peeloff(sk
, peeloff
->associd
, &newsock
);
4947 /* Map the socket to an unused fd that can be returned to the user. */
4948 retval
= get_unused_fd_flags(flags
& SOCK_CLOEXEC
);
4950 sock_release(newsock
);
4954 *newfile
= sock_alloc_file(newsock
, 0, NULL
);
4955 if (IS_ERR(*newfile
)) {
4956 put_unused_fd(retval
);
4957 sock_release(newsock
);
4958 retval
= PTR_ERR(*newfile
);
4963 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__
, sk
, newsock
->sk
,
4966 peeloff
->sd
= retval
;
4968 if (flags
& SOCK_NONBLOCK
)
4969 (*newfile
)->f_flags
|= O_NONBLOCK
;
4974 static int sctp_getsockopt_peeloff(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
4976 sctp_peeloff_arg_t peeloff
;
4977 struct file
*newfile
= NULL
;
4980 if (len
< sizeof(sctp_peeloff_arg_t
))
4982 len
= sizeof(sctp_peeloff_arg_t
);
4983 if (copy_from_user(&peeloff
, optval
, len
))
4986 retval
= sctp_getsockopt_peeloff_common(sk
, &peeloff
, &newfile
, 0);
4990 /* Return the fd mapped to the new socket. */
4991 if (put_user(len
, optlen
)) {
4993 put_unused_fd(retval
);
4997 if (copy_to_user(optval
, &peeloff
, len
)) {
4999 put_unused_fd(retval
);
5002 fd_install(retval
, newfile
);
5007 static int sctp_getsockopt_peeloff_flags(struct sock
*sk
, int len
,
5008 char __user
*optval
, int __user
*optlen
)
5010 sctp_peeloff_flags_arg_t peeloff
;
5011 struct file
*newfile
= NULL
;
5014 if (len
< sizeof(sctp_peeloff_flags_arg_t
))
5016 len
= sizeof(sctp_peeloff_flags_arg_t
);
5017 if (copy_from_user(&peeloff
, optval
, len
))
5020 retval
= sctp_getsockopt_peeloff_common(sk
, &peeloff
.p_arg
,
5021 &newfile
, peeloff
.flags
);
5025 /* Return the fd mapped to the new socket. */
5026 if (put_user(len
, optlen
)) {
5028 put_unused_fd(retval
);
5032 if (copy_to_user(optval
, &peeloff
, len
)) {
5034 put_unused_fd(retval
);
5037 fd_install(retval
, newfile
);
5042 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5044 * Applications can enable or disable heartbeats for any peer address of
5045 * an association, modify an address's heartbeat interval, force a
5046 * heartbeat to be sent immediately, and adjust the address's maximum
5047 * number of retransmissions sent before an address is considered
5048 * unreachable. The following structure is used to access and modify an
5049 * address's parameters:
5051 * struct sctp_paddrparams {
5052 * sctp_assoc_t spp_assoc_id;
5053 * struct sockaddr_storage spp_address;
5054 * uint32_t spp_hbinterval;
5055 * uint16_t spp_pathmaxrxt;
5056 * uint32_t spp_pathmtu;
5057 * uint32_t spp_sackdelay;
5058 * uint32_t spp_flags;
5061 * spp_assoc_id - (one-to-many style socket) This is filled in the
5062 * application, and identifies the association for
5064 * spp_address - This specifies which address is of interest.
5065 * spp_hbinterval - This contains the value of the heartbeat interval,
5066 * in milliseconds. If a value of zero
5067 * is present in this field then no changes are to
5068 * be made to this parameter.
5069 * spp_pathmaxrxt - This contains the maximum number of
5070 * retransmissions before this address shall be
5071 * considered unreachable. If a value of zero
5072 * is present in this field then no changes are to
5073 * be made to this parameter.
5074 * spp_pathmtu - When Path MTU discovery is disabled the value
5075 * specified here will be the "fixed" path mtu.
5076 * Note that if the spp_address field is empty
5077 * then all associations on this address will
5078 * have this fixed path mtu set upon them.
5080 * spp_sackdelay - When delayed sack is enabled, this value specifies
5081 * the number of milliseconds that sacks will be delayed
5082 * for. This value will apply to all addresses of an
5083 * association if the spp_address field is empty. Note
5084 * also, that if delayed sack is enabled and this
5085 * value is set to 0, no change is made to the last
5086 * recorded delayed sack timer value.
5088 * spp_flags - These flags are used to control various features
5089 * on an association. The flag field may contain
5090 * zero or more of the following options.
5092 * SPP_HB_ENABLE - Enable heartbeats on the
5093 * specified address. Note that if the address
5094 * field is empty all addresses for the association
5095 * have heartbeats enabled upon them.
5097 * SPP_HB_DISABLE - Disable heartbeats on the
5098 * speicifed address. Note that if the address
5099 * field is empty all addresses for the association
5100 * will have their heartbeats disabled. Note also
5101 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5102 * mutually exclusive, only one of these two should
5103 * be specified. Enabling both fields will have
5104 * undetermined results.
5106 * SPP_HB_DEMAND - Request a user initiated heartbeat
5107 * to be made immediately.
5109 * SPP_PMTUD_ENABLE - This field will enable PMTU
5110 * discovery upon the specified address. Note that
5111 * if the address feild is empty then all addresses
5112 * on the association are effected.
5114 * SPP_PMTUD_DISABLE - This field will disable PMTU
5115 * discovery upon the specified address. Note that
5116 * if the address feild is empty then all addresses
5117 * on the association are effected. Not also that
5118 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5119 * exclusive. Enabling both will have undetermined
5122 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5123 * on delayed sack. The time specified in spp_sackdelay
5124 * is used to specify the sack delay for this address. Note
5125 * that if spp_address is empty then all addresses will
5126 * enable delayed sack and take on the sack delay
5127 * value specified in spp_sackdelay.
5128 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5129 * off delayed sack. If the spp_address field is blank then
5130 * delayed sack is disabled for the entire association. Note
5131 * also that this field is mutually exclusive to
5132 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5135 static int sctp_getsockopt_peer_addr_params(struct sock
*sk
, int len
,
5136 char __user
*optval
, int __user
*optlen
)
5138 struct sctp_paddrparams params
;
5139 struct sctp_transport
*trans
= NULL
;
5140 struct sctp_association
*asoc
= NULL
;
5141 struct sctp_sock
*sp
= sctp_sk(sk
);
5143 if (len
< sizeof(struct sctp_paddrparams
))
5145 len
= sizeof(struct sctp_paddrparams
);
5146 if (copy_from_user(¶ms
, optval
, len
))
5149 /* If an address other than INADDR_ANY is specified, and
5150 * no transport is found, then the request is invalid.
5152 if (!sctp_is_any(sk
, (union sctp_addr
*)¶ms
.spp_address
)) {
5153 trans
= sctp_addr_id2transport(sk
, ¶ms
.spp_address
,
5154 params
.spp_assoc_id
);
5156 pr_debug("%s: failed no transport\n", __func__
);
5161 /* Get association, if assoc_id != 0 and the socket is a one
5162 * to many style socket, and an association was not found, then
5163 * the id was invalid.
5165 asoc
= sctp_id2assoc(sk
, params
.spp_assoc_id
);
5166 if (!asoc
&& params
.spp_assoc_id
&& sctp_style(sk
, UDP
)) {
5167 pr_debug("%s: failed no association\n", __func__
);
5172 /* Fetch transport values. */
5173 params
.spp_hbinterval
= jiffies_to_msecs(trans
->hbinterval
);
5174 params
.spp_pathmtu
= trans
->pathmtu
;
5175 params
.spp_pathmaxrxt
= trans
->pathmaxrxt
;
5176 params
.spp_sackdelay
= jiffies_to_msecs(trans
->sackdelay
);
5178 /*draft-11 doesn't say what to return in spp_flags*/
5179 params
.spp_flags
= trans
->param_flags
;
5181 /* Fetch association values. */
5182 params
.spp_hbinterval
= jiffies_to_msecs(asoc
->hbinterval
);
5183 params
.spp_pathmtu
= asoc
->pathmtu
;
5184 params
.spp_pathmaxrxt
= asoc
->pathmaxrxt
;
5185 params
.spp_sackdelay
= jiffies_to_msecs(asoc
->sackdelay
);
5187 /*draft-11 doesn't say what to return in spp_flags*/
5188 params
.spp_flags
= asoc
->param_flags
;
5190 /* Fetch socket values. */
5191 params
.spp_hbinterval
= sp
->hbinterval
;
5192 params
.spp_pathmtu
= sp
->pathmtu
;
5193 params
.spp_sackdelay
= sp
->sackdelay
;
5194 params
.spp_pathmaxrxt
= sp
->pathmaxrxt
;
5196 /*draft-11 doesn't say what to return in spp_flags*/
5197 params
.spp_flags
= sp
->param_flags
;
5200 if (copy_to_user(optval
, ¶ms
, len
))
5203 if (put_user(len
, optlen
))
5210 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5212 * This option will effect the way delayed acks are performed. This
5213 * option allows you to get or set the delayed ack time, in
5214 * milliseconds. It also allows changing the delayed ack frequency.
5215 * Changing the frequency to 1 disables the delayed sack algorithm. If
5216 * the assoc_id is 0, then this sets or gets the endpoints default
5217 * values. If the assoc_id field is non-zero, then the set or get
5218 * effects the specified association for the one to many model (the
5219 * assoc_id field is ignored by the one to one model). Note that if
5220 * sack_delay or sack_freq are 0 when setting this option, then the
5221 * current values will remain unchanged.
5223 * struct sctp_sack_info {
5224 * sctp_assoc_t sack_assoc_id;
5225 * uint32_t sack_delay;
5226 * uint32_t sack_freq;
5229 * sack_assoc_id - This parameter, indicates which association the user
5230 * is performing an action upon. Note that if this field's value is
5231 * zero then the endpoints default value is changed (effecting future
5232 * associations only).
5234 * sack_delay - This parameter contains the number of milliseconds that
5235 * the user is requesting the delayed ACK timer be set to. Note that
5236 * this value is defined in the standard to be between 200 and 500
5239 * sack_freq - This parameter contains the number of packets that must
5240 * be received before a sack is sent without waiting for the delay
5241 * timer to expire. The default value for this is 2, setting this
5242 * value to 1 will disable the delayed sack algorithm.
5244 static int sctp_getsockopt_delayed_ack(struct sock
*sk
, int len
,
5245 char __user
*optval
,
5248 struct sctp_sack_info params
;
5249 struct sctp_association
*asoc
= NULL
;
5250 struct sctp_sock
*sp
= sctp_sk(sk
);
5252 if (len
>= sizeof(struct sctp_sack_info
)) {
5253 len
= sizeof(struct sctp_sack_info
);
5255 if (copy_from_user(¶ms
, optval
, len
))
5257 } else if (len
== sizeof(struct sctp_assoc_value
)) {
5258 pr_warn_ratelimited(DEPRECATED
5260 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5261 "Use struct sctp_sack_info instead\n",
5262 current
->comm
, task_pid_nr(current
));
5263 if (copy_from_user(¶ms
, optval
, len
))
5268 /* Get association, if sack_assoc_id != 0 and the socket is a one
5269 * to many style socket, and an association was not found, then
5270 * the id was invalid.
5272 asoc
= sctp_id2assoc(sk
, params
.sack_assoc_id
);
5273 if (!asoc
&& params
.sack_assoc_id
&& sctp_style(sk
, UDP
))
5277 /* Fetch association values. */
5278 if (asoc
->param_flags
& SPP_SACKDELAY_ENABLE
) {
5279 params
.sack_delay
= jiffies_to_msecs(
5281 params
.sack_freq
= asoc
->sackfreq
;
5284 params
.sack_delay
= 0;
5285 params
.sack_freq
= 1;
5288 /* Fetch socket values. */
5289 if (sp
->param_flags
& SPP_SACKDELAY_ENABLE
) {
5290 params
.sack_delay
= sp
->sackdelay
;
5291 params
.sack_freq
= sp
->sackfreq
;
5293 params
.sack_delay
= 0;
5294 params
.sack_freq
= 1;
5298 if (copy_to_user(optval
, ¶ms
, len
))
5301 if (put_user(len
, optlen
))
5307 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5309 * Applications can specify protocol parameters for the default association
5310 * initialization. The option name argument to setsockopt() and getsockopt()
5313 * Setting initialization parameters is effective only on an unconnected
5314 * socket (for UDP-style sockets only future associations are effected
5315 * by the change). With TCP-style sockets, this option is inherited by
5316 * sockets derived from a listener socket.
5318 static int sctp_getsockopt_initmsg(struct sock
*sk
, int len
, char __user
*optval
, int __user
*optlen
)
5320 if (len
< sizeof(struct sctp_initmsg
))
5322 len
= sizeof(struct sctp_initmsg
);
5323 if (put_user(len
, optlen
))
5325 if (copy_to_user(optval
, &sctp_sk(sk
)->initmsg
, len
))
5331 static int sctp_getsockopt_peer_addrs(struct sock
*sk
, int len
,
5332 char __user
*optval
, int __user
*optlen
)
5334 struct sctp_association
*asoc
;
5336 struct sctp_getaddrs getaddrs
;
5337 struct sctp_transport
*from
;
5339 union sctp_addr temp
;
5340 struct sctp_sock
*sp
= sctp_sk(sk
);
5345 if (len
< sizeof(struct sctp_getaddrs
))
5348 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
5351 /* For UDP-style sockets, id specifies the association to query. */
5352 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
5356 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
5357 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
5359 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
5361 memcpy(&temp
, &from
->ipaddr
, sizeof(temp
));
5362 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5363 ->addr_to_user(sp
, &temp
);
5364 if (space_left
< addrlen
)
5366 if (copy_to_user(to
, &temp
, addrlen
))
5370 space_left
-= addrlen
;
5373 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
))
5375 bytes_copied
= ((char __user
*)to
) - optval
;
5376 if (put_user(bytes_copied
, optlen
))
5382 static int sctp_copy_laddrs(struct sock
*sk
, __u16 port
, void *to
,
5383 size_t space_left
, int *bytes_copied
)
5385 struct sctp_sockaddr_entry
*addr
;
5386 union sctp_addr temp
;
5389 struct net
*net
= sock_net(sk
);
5392 list_for_each_entry_rcu(addr
, &net
->sctp
.local_addr_list
, list
) {
5396 if ((PF_INET
== sk
->sk_family
) &&
5397 (AF_INET6
== addr
->a
.sa
.sa_family
))
5399 if ((PF_INET6
== sk
->sk_family
) &&
5400 inet_v6_ipv6only(sk
) &&
5401 (AF_INET
== addr
->a
.sa
.sa_family
))
5403 memcpy(&temp
, &addr
->a
, sizeof(temp
));
5404 if (!temp
.v4
.sin_port
)
5405 temp
.v4
.sin_port
= htons(port
);
5407 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5408 ->addr_to_user(sctp_sk(sk
), &temp
);
5410 if (space_left
< addrlen
) {
5414 memcpy(to
, &temp
, addrlen
);
5418 space_left
-= addrlen
;
5419 *bytes_copied
+= addrlen
;
5427 static int sctp_getsockopt_local_addrs(struct sock
*sk
, int len
,
5428 char __user
*optval
, int __user
*optlen
)
5430 struct sctp_bind_addr
*bp
;
5431 struct sctp_association
*asoc
;
5433 struct sctp_getaddrs getaddrs
;
5434 struct sctp_sockaddr_entry
*addr
;
5436 union sctp_addr temp
;
5437 struct sctp_sock
*sp
= sctp_sk(sk
);
5441 int bytes_copied
= 0;
5445 if (len
< sizeof(struct sctp_getaddrs
))
5448 if (copy_from_user(&getaddrs
, optval
, sizeof(struct sctp_getaddrs
)))
5452 * For UDP-style sockets, id specifies the association to query.
5453 * If the id field is set to the value '0' then the locally bound
5454 * addresses are returned without regard to any particular
5457 if (0 == getaddrs
.assoc_id
) {
5458 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
5460 asoc
= sctp_id2assoc(sk
, getaddrs
.assoc_id
);
5463 bp
= &asoc
->base
.bind_addr
;
5466 to
= optval
+ offsetof(struct sctp_getaddrs
, addrs
);
5467 space_left
= len
- offsetof(struct sctp_getaddrs
, addrs
);
5469 addrs
= kmalloc(space_left
, GFP_USER
| __GFP_NOWARN
);
5473 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5474 * addresses from the global local address list.
5476 if (sctp_list_single_entry(&bp
->address_list
)) {
5477 addr
= list_entry(bp
->address_list
.next
,
5478 struct sctp_sockaddr_entry
, list
);
5479 if (sctp_is_any(sk
, &addr
->a
)) {
5480 cnt
= sctp_copy_laddrs(sk
, bp
->port
, addrs
,
5481 space_left
, &bytes_copied
);
5491 /* Protection on the bound address list is not needed since
5492 * in the socket option context we hold a socket lock and
5493 * thus the bound address list can't change.
5495 list_for_each_entry(addr
, &bp
->address_list
, list
) {
5496 memcpy(&temp
, &addr
->a
, sizeof(temp
));
5497 addrlen
= sctp_get_pf_specific(sk
->sk_family
)
5498 ->addr_to_user(sp
, &temp
);
5499 if (space_left
< addrlen
) {
5500 err
= -ENOMEM
; /*fixme: right error?*/
5503 memcpy(buf
, &temp
, addrlen
);
5505 bytes_copied
+= addrlen
;
5507 space_left
-= addrlen
;
5511 if (copy_to_user(to
, addrs
, bytes_copied
)) {
5515 if (put_user(cnt
, &((struct sctp_getaddrs __user
*)optval
)->addr_num
)) {
5519 if (put_user(bytes_copied
, optlen
))
5526 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5528 * Requests that the local SCTP stack use the enclosed peer address as
5529 * the association primary. The enclosed address must be one of the
5530 * association peer's addresses.
5532 static int sctp_getsockopt_primary_addr(struct sock
*sk
, int len
,
5533 char __user
*optval
, int __user
*optlen
)
5535 struct sctp_prim prim
;
5536 struct sctp_association
*asoc
;
5537 struct sctp_sock
*sp
= sctp_sk(sk
);
5539 if (len
< sizeof(struct sctp_prim
))
5542 len
= sizeof(struct sctp_prim
);
5544 if (copy_from_user(&prim
, optval
, len
))
5547 asoc
= sctp_id2assoc(sk
, prim
.ssp_assoc_id
);
5551 if (!asoc
->peer
.primary_path
)
5554 memcpy(&prim
.ssp_addr
, &asoc
->peer
.primary_path
->ipaddr
,
5555 asoc
->peer
.primary_path
->af_specific
->sockaddr_len
);
5557 sctp_get_pf_specific(sk
->sk_family
)->addr_to_user(sp
,
5558 (union sctp_addr
*)&prim
.ssp_addr
);
5560 if (put_user(len
, optlen
))
5562 if (copy_to_user(optval
, &prim
, len
))
5569 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5571 * Requests that the local endpoint set the specified Adaptation Layer
5572 * Indication parameter for all future INIT and INIT-ACK exchanges.
5574 static int sctp_getsockopt_adaptation_layer(struct sock
*sk
, int len
,
5575 char __user
*optval
, int __user
*optlen
)
5577 struct sctp_setadaptation adaptation
;
5579 if (len
< sizeof(struct sctp_setadaptation
))
5582 len
= sizeof(struct sctp_setadaptation
);
5584 adaptation
.ssb_adaptation_ind
= sctp_sk(sk
)->adaptation_ind
;
5586 if (put_user(len
, optlen
))
5588 if (copy_to_user(optval
, &adaptation
, len
))
5596 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5598 * Applications that wish to use the sendto() system call may wish to
5599 * specify a default set of parameters that would normally be supplied
5600 * through the inclusion of ancillary data. This socket option allows
5601 * such an application to set the default sctp_sndrcvinfo structure.
5604 * The application that wishes to use this socket option simply passes
5605 * in to this call the sctp_sndrcvinfo structure defined in Section
5606 * 5.2.2) The input parameters accepted by this call include
5607 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5608 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5609 * to this call if the caller is using the UDP model.
5611 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5613 static int sctp_getsockopt_default_send_param(struct sock
*sk
,
5614 int len
, char __user
*optval
,
5617 struct sctp_sock
*sp
= sctp_sk(sk
);
5618 struct sctp_association
*asoc
;
5619 struct sctp_sndrcvinfo info
;
5621 if (len
< sizeof(info
))
5626 if (copy_from_user(&info
, optval
, len
))
5629 asoc
= sctp_id2assoc(sk
, info
.sinfo_assoc_id
);
5630 if (!asoc
&& info
.sinfo_assoc_id
&& sctp_style(sk
, UDP
))
5633 info
.sinfo_stream
= asoc
->default_stream
;
5634 info
.sinfo_flags
= asoc
->default_flags
;
5635 info
.sinfo_ppid
= asoc
->default_ppid
;
5636 info
.sinfo_context
= asoc
->default_context
;
5637 info
.sinfo_timetolive
= asoc
->default_timetolive
;
5639 info
.sinfo_stream
= sp
->default_stream
;
5640 info
.sinfo_flags
= sp
->default_flags
;
5641 info
.sinfo_ppid
= sp
->default_ppid
;
5642 info
.sinfo_context
= sp
->default_context
;
5643 info
.sinfo_timetolive
= sp
->default_timetolive
;
5646 if (put_user(len
, optlen
))
5648 if (copy_to_user(optval
, &info
, len
))
5654 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5655 * (SCTP_DEFAULT_SNDINFO)
5657 static int sctp_getsockopt_default_sndinfo(struct sock
*sk
, int len
,
5658 char __user
*optval
,
5661 struct sctp_sock
*sp
= sctp_sk(sk
);
5662 struct sctp_association
*asoc
;
5663 struct sctp_sndinfo info
;
5665 if (len
< sizeof(info
))
5670 if (copy_from_user(&info
, optval
, len
))
5673 asoc
= sctp_id2assoc(sk
, info
.snd_assoc_id
);
5674 if (!asoc
&& info
.snd_assoc_id
&& sctp_style(sk
, UDP
))
5677 info
.snd_sid
= asoc
->default_stream
;
5678 info
.snd_flags
= asoc
->default_flags
;
5679 info
.snd_ppid
= asoc
->default_ppid
;
5680 info
.snd_context
= asoc
->default_context
;
5682 info
.snd_sid
= sp
->default_stream
;
5683 info
.snd_flags
= sp
->default_flags
;
5684 info
.snd_ppid
= sp
->default_ppid
;
5685 info
.snd_context
= sp
->default_context
;
5688 if (put_user(len
, optlen
))
5690 if (copy_to_user(optval
, &info
, len
))
5698 * 7.1.5 SCTP_NODELAY
5700 * Turn on/off any Nagle-like algorithm. This means that packets are
5701 * generally sent as soon as possible and no unnecessary delays are
5702 * introduced, at the cost of more packets in the network. Expects an
5703 * integer boolean flag.
5706 static int sctp_getsockopt_nodelay(struct sock
*sk
, int len
,
5707 char __user
*optval
, int __user
*optlen
)
5711 if (len
< sizeof(int))
5715 val
= (sctp_sk(sk
)->nodelay
== 1);
5716 if (put_user(len
, optlen
))
5718 if (copy_to_user(optval
, &val
, len
))
5725 * 7.1.1 SCTP_RTOINFO
5727 * The protocol parameters used to initialize and bound retransmission
5728 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5729 * and modify these parameters.
5730 * All parameters are time values, in milliseconds. A value of 0, when
5731 * modifying the parameters, indicates that the current value should not
5735 static int sctp_getsockopt_rtoinfo(struct sock
*sk
, int len
,
5736 char __user
*optval
,
5737 int __user
*optlen
) {
5738 struct sctp_rtoinfo rtoinfo
;
5739 struct sctp_association
*asoc
;
5741 if (len
< sizeof (struct sctp_rtoinfo
))
5744 len
= sizeof(struct sctp_rtoinfo
);
5746 if (copy_from_user(&rtoinfo
, optval
, len
))
5749 asoc
= sctp_id2assoc(sk
, rtoinfo
.srto_assoc_id
);
5751 if (!asoc
&& rtoinfo
.srto_assoc_id
&& sctp_style(sk
, UDP
))
5754 /* Values corresponding to the specific association. */
5756 rtoinfo
.srto_initial
= jiffies_to_msecs(asoc
->rto_initial
);
5757 rtoinfo
.srto_max
= jiffies_to_msecs(asoc
->rto_max
);
5758 rtoinfo
.srto_min
= jiffies_to_msecs(asoc
->rto_min
);
5760 /* Values corresponding to the endpoint. */
5761 struct sctp_sock
*sp
= sctp_sk(sk
);
5763 rtoinfo
.srto_initial
= sp
->rtoinfo
.srto_initial
;
5764 rtoinfo
.srto_max
= sp
->rtoinfo
.srto_max
;
5765 rtoinfo
.srto_min
= sp
->rtoinfo
.srto_min
;
5768 if (put_user(len
, optlen
))
5771 if (copy_to_user(optval
, &rtoinfo
, len
))
5779 * 7.1.2 SCTP_ASSOCINFO
5781 * This option is used to tune the maximum retransmission attempts
5782 * of the association.
5783 * Returns an error if the new association retransmission value is
5784 * greater than the sum of the retransmission value of the peer.
5785 * See [SCTP] for more information.
5788 static int sctp_getsockopt_associnfo(struct sock
*sk
, int len
,
5789 char __user
*optval
,
5793 struct sctp_assocparams assocparams
;
5794 struct sctp_association
*asoc
;
5795 struct list_head
*pos
;
5798 if (len
< sizeof (struct sctp_assocparams
))
5801 len
= sizeof(struct sctp_assocparams
);
5803 if (copy_from_user(&assocparams
, optval
, len
))
5806 asoc
= sctp_id2assoc(sk
, assocparams
.sasoc_assoc_id
);
5808 if (!asoc
&& assocparams
.sasoc_assoc_id
&& sctp_style(sk
, UDP
))
5811 /* Values correspoinding to the specific association */
5813 assocparams
.sasoc_asocmaxrxt
= asoc
->max_retrans
;
5814 assocparams
.sasoc_peer_rwnd
= asoc
->peer
.rwnd
;
5815 assocparams
.sasoc_local_rwnd
= asoc
->a_rwnd
;
5816 assocparams
.sasoc_cookie_life
= ktime_to_ms(asoc
->cookie_life
);
5818 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
5822 assocparams
.sasoc_number_peer_destinations
= cnt
;
5824 /* Values corresponding to the endpoint */
5825 struct sctp_sock
*sp
= sctp_sk(sk
);
5827 assocparams
.sasoc_asocmaxrxt
= sp
->assocparams
.sasoc_asocmaxrxt
;
5828 assocparams
.sasoc_peer_rwnd
= sp
->assocparams
.sasoc_peer_rwnd
;
5829 assocparams
.sasoc_local_rwnd
= sp
->assocparams
.sasoc_local_rwnd
;
5830 assocparams
.sasoc_cookie_life
=
5831 sp
->assocparams
.sasoc_cookie_life
;
5832 assocparams
.sasoc_number_peer_destinations
=
5834 sasoc_number_peer_destinations
;
5837 if (put_user(len
, optlen
))
5840 if (copy_to_user(optval
, &assocparams
, len
))
5847 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5849 * This socket option is a boolean flag which turns on or off mapped V4
5850 * addresses. If this option is turned on and the socket is type
5851 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5852 * If this option is turned off, then no mapping will be done of V4
5853 * addresses and a user will receive both PF_INET6 and PF_INET type
5854 * addresses on the socket.
5856 static int sctp_getsockopt_mappedv4(struct sock
*sk
, int len
,
5857 char __user
*optval
, int __user
*optlen
)
5860 struct sctp_sock
*sp
= sctp_sk(sk
);
5862 if (len
< sizeof(int))
5867 if (put_user(len
, optlen
))
5869 if (copy_to_user(optval
, &val
, len
))
5876 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5877 * (chapter and verse is quoted at sctp_setsockopt_context())
5879 static int sctp_getsockopt_context(struct sock
*sk
, int len
,
5880 char __user
*optval
, int __user
*optlen
)
5882 struct sctp_assoc_value params
;
5883 struct sctp_sock
*sp
;
5884 struct sctp_association
*asoc
;
5886 if (len
< sizeof(struct sctp_assoc_value
))
5889 len
= sizeof(struct sctp_assoc_value
);
5891 if (copy_from_user(¶ms
, optval
, len
))
5896 if (params
.assoc_id
!= 0) {
5897 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5900 params
.assoc_value
= asoc
->default_rcv_context
;
5902 params
.assoc_value
= sp
->default_rcv_context
;
5905 if (put_user(len
, optlen
))
5907 if (copy_to_user(optval
, ¶ms
, len
))
5914 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5915 * This option will get or set the maximum size to put in any outgoing
5916 * SCTP DATA chunk. If a message is larger than this size it will be
5917 * fragmented by SCTP into the specified size. Note that the underlying
5918 * SCTP implementation may fragment into smaller sized chunks when the
5919 * PMTU of the underlying association is smaller than the value set by
5920 * the user. The default value for this option is '0' which indicates
5921 * the user is NOT limiting fragmentation and only the PMTU will effect
5922 * SCTP's choice of DATA chunk size. Note also that values set larger
5923 * than the maximum size of an IP datagram will effectively let SCTP
5924 * control fragmentation (i.e. the same as setting this option to 0).
5926 * The following structure is used to access and modify this parameter:
5928 * struct sctp_assoc_value {
5929 * sctp_assoc_t assoc_id;
5930 * uint32_t assoc_value;
5933 * assoc_id: This parameter is ignored for one-to-one style sockets.
5934 * For one-to-many style sockets this parameter indicates which
5935 * association the user is performing an action upon. Note that if
5936 * this field's value is zero then the endpoints default value is
5937 * changed (effecting future associations only).
5938 * assoc_value: This parameter specifies the maximum size in bytes.
5940 static int sctp_getsockopt_maxseg(struct sock
*sk
, int len
,
5941 char __user
*optval
, int __user
*optlen
)
5943 struct sctp_assoc_value params
;
5944 struct sctp_association
*asoc
;
5946 if (len
== sizeof(int)) {
5947 pr_warn_ratelimited(DEPRECATED
5949 "Use of int in maxseg socket option.\n"
5950 "Use struct sctp_assoc_value instead\n",
5951 current
->comm
, task_pid_nr(current
));
5952 params
.assoc_id
= 0;
5953 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
5954 len
= sizeof(struct sctp_assoc_value
);
5955 if (copy_from_user(¶ms
, optval
, sizeof(params
)))
5960 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
5961 if (!asoc
&& params
.assoc_id
&& sctp_style(sk
, UDP
))
5965 params
.assoc_value
= asoc
->frag_point
;
5967 params
.assoc_value
= sctp_sk(sk
)->user_frag
;
5969 if (put_user(len
, optlen
))
5971 if (len
== sizeof(int)) {
5972 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
5975 if (copy_to_user(optval
, ¶ms
, len
))
5983 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5984 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5986 static int sctp_getsockopt_fragment_interleave(struct sock
*sk
, int len
,
5987 char __user
*optval
, int __user
*optlen
)
5991 if (len
< sizeof(int))
5996 val
= sctp_sk(sk
)->frag_interleave
;
5997 if (put_user(len
, optlen
))
5999 if (copy_to_user(optval
, &val
, len
))
6006 * 7.1.25. Set or Get the sctp partial delivery point
6007 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6009 static int sctp_getsockopt_partial_delivery_point(struct sock
*sk
, int len
,
6010 char __user
*optval
,
6015 if (len
< sizeof(u32
))
6020 val
= sctp_sk(sk
)->pd_point
;
6021 if (put_user(len
, optlen
))
6023 if (copy_to_user(optval
, &val
, len
))
6030 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6031 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6033 static int sctp_getsockopt_maxburst(struct sock
*sk
, int len
,
6034 char __user
*optval
,
6037 struct sctp_assoc_value params
;
6038 struct sctp_sock
*sp
;
6039 struct sctp_association
*asoc
;
6041 if (len
== sizeof(int)) {
6042 pr_warn_ratelimited(DEPRECATED
6044 "Use of int in max_burst socket option.\n"
6045 "Use struct sctp_assoc_value instead\n",
6046 current
->comm
, task_pid_nr(current
));
6047 params
.assoc_id
= 0;
6048 } else if (len
>= sizeof(struct sctp_assoc_value
)) {
6049 len
= sizeof(struct sctp_assoc_value
);
6050 if (copy_from_user(¶ms
, optval
, len
))
6057 if (params
.assoc_id
!= 0) {
6058 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6061 params
.assoc_value
= asoc
->max_burst
;
6063 params
.assoc_value
= sp
->max_burst
;
6065 if (len
== sizeof(int)) {
6066 if (copy_to_user(optval
, ¶ms
.assoc_value
, len
))
6069 if (copy_to_user(optval
, ¶ms
, len
))
6077 static int sctp_getsockopt_hmac_ident(struct sock
*sk
, int len
,
6078 char __user
*optval
, int __user
*optlen
)
6080 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6081 struct sctp_hmacalgo __user
*p
= (void __user
*)optval
;
6082 struct sctp_hmac_algo_param
*hmacs
;
6087 if (!ep
->auth_enable
)
6090 hmacs
= ep
->auth_hmacs_list
;
6091 data_len
= ntohs(hmacs
->param_hdr
.length
) -
6092 sizeof(struct sctp_paramhdr
);
6094 if (len
< sizeof(struct sctp_hmacalgo
) + data_len
)
6097 len
= sizeof(struct sctp_hmacalgo
) + data_len
;
6098 num_idents
= data_len
/ sizeof(u16
);
6100 if (put_user(len
, optlen
))
6102 if (put_user(num_idents
, &p
->shmac_num_idents
))
6104 for (i
= 0; i
< num_idents
; i
++) {
6105 __u16 hmacid
= ntohs(hmacs
->hmac_ids
[i
]);
6107 if (copy_to_user(&p
->shmac_idents
[i
], &hmacid
, sizeof(__u16
)))
6113 static int sctp_getsockopt_active_key(struct sock
*sk
, int len
,
6114 char __user
*optval
, int __user
*optlen
)
6116 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6117 struct sctp_authkeyid val
;
6118 struct sctp_association
*asoc
;
6120 if (!ep
->auth_enable
)
6123 if (len
< sizeof(struct sctp_authkeyid
))
6125 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authkeyid
)))
6128 asoc
= sctp_id2assoc(sk
, val
.scact_assoc_id
);
6129 if (!asoc
&& val
.scact_assoc_id
&& sctp_style(sk
, UDP
))
6133 val
.scact_keynumber
= asoc
->active_key_id
;
6135 val
.scact_keynumber
= ep
->active_key_id
;
6137 len
= sizeof(struct sctp_authkeyid
);
6138 if (put_user(len
, optlen
))
6140 if (copy_to_user(optval
, &val
, len
))
6146 static int sctp_getsockopt_peer_auth_chunks(struct sock
*sk
, int len
,
6147 char __user
*optval
, int __user
*optlen
)
6149 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6150 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
6151 struct sctp_authchunks val
;
6152 struct sctp_association
*asoc
;
6153 struct sctp_chunks_param
*ch
;
6157 if (!ep
->auth_enable
)
6160 if (len
< sizeof(struct sctp_authchunks
))
6163 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
6166 to
= p
->gauth_chunks
;
6167 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
6171 ch
= asoc
->peer
.peer_chunks
;
6175 /* See if the user provided enough room for all the data */
6176 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(struct sctp_paramhdr
);
6177 if (len
< num_chunks
)
6180 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
6183 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
6184 if (put_user(len
, optlen
))
6186 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
6191 static int sctp_getsockopt_local_auth_chunks(struct sock
*sk
, int len
,
6192 char __user
*optval
, int __user
*optlen
)
6194 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
6195 struct sctp_authchunks __user
*p
= (void __user
*)optval
;
6196 struct sctp_authchunks val
;
6197 struct sctp_association
*asoc
;
6198 struct sctp_chunks_param
*ch
;
6202 if (!ep
->auth_enable
)
6205 if (len
< sizeof(struct sctp_authchunks
))
6208 if (copy_from_user(&val
, optval
, sizeof(struct sctp_authchunks
)))
6211 to
= p
->gauth_chunks
;
6212 asoc
= sctp_id2assoc(sk
, val
.gauth_assoc_id
);
6213 if (!asoc
&& val
.gauth_assoc_id
&& sctp_style(sk
, UDP
))
6217 ch
= (struct sctp_chunks_param
*)asoc
->c
.auth_chunks
;
6219 ch
= ep
->auth_chunk_list
;
6224 num_chunks
= ntohs(ch
->param_hdr
.length
) - sizeof(struct sctp_paramhdr
);
6225 if (len
< sizeof(struct sctp_authchunks
) + num_chunks
)
6228 if (copy_to_user(to
, ch
->chunks
, num_chunks
))
6231 len
= sizeof(struct sctp_authchunks
) + num_chunks
;
6232 if (put_user(len
, optlen
))
6234 if (put_user(num_chunks
, &p
->gauth_number_of_chunks
))
6241 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6242 * This option gets the current number of associations that are attached
6243 * to a one-to-many style socket. The option value is an uint32_t.
6245 static int sctp_getsockopt_assoc_number(struct sock
*sk
, int len
,
6246 char __user
*optval
, int __user
*optlen
)
6248 struct sctp_sock
*sp
= sctp_sk(sk
);
6249 struct sctp_association
*asoc
;
6252 if (sctp_style(sk
, TCP
))
6255 if (len
< sizeof(u32
))
6260 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6264 if (put_user(len
, optlen
))
6266 if (copy_to_user(optval
, &val
, len
))
6273 * 8.1.23 SCTP_AUTO_ASCONF
6274 * See the corresponding setsockopt entry as description
6276 static int sctp_getsockopt_auto_asconf(struct sock
*sk
, int len
,
6277 char __user
*optval
, int __user
*optlen
)
6281 if (len
< sizeof(int))
6285 if (sctp_sk(sk
)->do_auto_asconf
&& sctp_is_ep_boundall(sk
))
6287 if (put_user(len
, optlen
))
6289 if (copy_to_user(optval
, &val
, len
))
6295 * 8.2.6. Get the Current Identifiers of Associations
6296 * (SCTP_GET_ASSOC_ID_LIST)
6298 * This option gets the current list of SCTP association identifiers of
6299 * the SCTP associations handled by a one-to-many style socket.
6301 static int sctp_getsockopt_assoc_ids(struct sock
*sk
, int len
,
6302 char __user
*optval
, int __user
*optlen
)
6304 struct sctp_sock
*sp
= sctp_sk(sk
);
6305 struct sctp_association
*asoc
;
6306 struct sctp_assoc_ids
*ids
;
6309 if (sctp_style(sk
, TCP
))
6312 if (len
< sizeof(struct sctp_assoc_ids
))
6315 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6319 if (len
< sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
)
6322 len
= sizeof(struct sctp_assoc_ids
) + sizeof(sctp_assoc_t
) * num
;
6324 ids
= kmalloc(len
, GFP_USER
| __GFP_NOWARN
);
6328 ids
->gaids_number_of_ids
= num
;
6330 list_for_each_entry(asoc
, &(sp
->ep
->asocs
), asocs
) {
6331 ids
->gaids_assoc_id
[num
++] = asoc
->assoc_id
;
6334 if (put_user(len
, optlen
) || copy_to_user(optval
, ids
, len
)) {
6344 * SCTP_PEER_ADDR_THLDS
6346 * This option allows us to fetch the partially failed threshold for one or all
6347 * transports in an association. See Section 6.1 of:
6348 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6350 static int sctp_getsockopt_paddr_thresholds(struct sock
*sk
,
6351 char __user
*optval
,
6355 struct sctp_paddrthlds val
;
6356 struct sctp_transport
*trans
;
6357 struct sctp_association
*asoc
;
6359 if (len
< sizeof(struct sctp_paddrthlds
))
6361 len
= sizeof(struct sctp_paddrthlds
);
6362 if (copy_from_user(&val
, (struct sctp_paddrthlds __user
*)optval
, len
))
6365 if (sctp_is_any(sk
, (const union sctp_addr
*)&val
.spt_address
)) {
6366 asoc
= sctp_id2assoc(sk
, val
.spt_assoc_id
);
6370 val
.spt_pathpfthld
= asoc
->pf_retrans
;
6371 val
.spt_pathmaxrxt
= asoc
->pathmaxrxt
;
6373 trans
= sctp_addr_id2transport(sk
, &val
.spt_address
,
6378 val
.spt_pathmaxrxt
= trans
->pathmaxrxt
;
6379 val
.spt_pathpfthld
= trans
->pf_retrans
;
6382 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
6389 * SCTP_GET_ASSOC_STATS
6391 * This option retrieves local per endpoint statistics. It is modeled
6392 * after OpenSolaris' implementation
6394 static int sctp_getsockopt_assoc_stats(struct sock
*sk
, int len
,
6395 char __user
*optval
,
6398 struct sctp_assoc_stats sas
;
6399 struct sctp_association
*asoc
= NULL
;
6401 /* User must provide at least the assoc id */
6402 if (len
< sizeof(sctp_assoc_t
))
6405 /* Allow the struct to grow and fill in as much as possible */
6406 len
= min_t(size_t, len
, sizeof(sas
));
6408 if (copy_from_user(&sas
, optval
, len
))
6411 asoc
= sctp_id2assoc(sk
, sas
.sas_assoc_id
);
6415 sas
.sas_rtxchunks
= asoc
->stats
.rtxchunks
;
6416 sas
.sas_gapcnt
= asoc
->stats
.gapcnt
;
6417 sas
.sas_outofseqtsns
= asoc
->stats
.outofseqtsns
;
6418 sas
.sas_osacks
= asoc
->stats
.osacks
;
6419 sas
.sas_isacks
= asoc
->stats
.isacks
;
6420 sas
.sas_octrlchunks
= asoc
->stats
.octrlchunks
;
6421 sas
.sas_ictrlchunks
= asoc
->stats
.ictrlchunks
;
6422 sas
.sas_oodchunks
= asoc
->stats
.oodchunks
;
6423 sas
.sas_iodchunks
= asoc
->stats
.iodchunks
;
6424 sas
.sas_ouodchunks
= asoc
->stats
.ouodchunks
;
6425 sas
.sas_iuodchunks
= asoc
->stats
.iuodchunks
;
6426 sas
.sas_idupchunks
= asoc
->stats
.idupchunks
;
6427 sas
.sas_opackets
= asoc
->stats
.opackets
;
6428 sas
.sas_ipackets
= asoc
->stats
.ipackets
;
6430 /* New high max rto observed, will return 0 if not a single
6431 * RTO update took place. obs_rto_ipaddr will be bogus
6434 sas
.sas_maxrto
= asoc
->stats
.max_obs_rto
;
6435 memcpy(&sas
.sas_obs_rto_ipaddr
, &asoc
->stats
.obs_rto_ipaddr
,
6436 sizeof(struct sockaddr_storage
));
6438 /* Mark beginning of a new observation period */
6439 asoc
->stats
.max_obs_rto
= asoc
->rto_min
;
6441 if (put_user(len
, optlen
))
6444 pr_debug("%s: len:%d, assoc_id:%d\n", __func__
, len
, sas
.sas_assoc_id
);
6446 if (copy_to_user(optval
, &sas
, len
))
6452 static int sctp_getsockopt_recvrcvinfo(struct sock
*sk
, int len
,
6453 char __user
*optval
,
6458 if (len
< sizeof(int))
6462 if (sctp_sk(sk
)->recvrcvinfo
)
6464 if (put_user(len
, optlen
))
6466 if (copy_to_user(optval
, &val
, len
))
6472 static int sctp_getsockopt_recvnxtinfo(struct sock
*sk
, int len
,
6473 char __user
*optval
,
6478 if (len
< sizeof(int))
6482 if (sctp_sk(sk
)->recvnxtinfo
)
6484 if (put_user(len
, optlen
))
6486 if (copy_to_user(optval
, &val
, len
))
6492 static int sctp_getsockopt_pr_supported(struct sock
*sk
, int len
,
6493 char __user
*optval
,
6496 struct sctp_assoc_value params
;
6497 struct sctp_association
*asoc
;
6498 int retval
= -EFAULT
;
6500 if (len
< sizeof(params
)) {
6505 len
= sizeof(params
);
6506 if (copy_from_user(¶ms
, optval
, len
))
6509 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6511 params
.assoc_value
= asoc
->prsctp_enable
;
6512 } else if (!params
.assoc_id
) {
6513 struct sctp_sock
*sp
= sctp_sk(sk
);
6515 params
.assoc_value
= sp
->ep
->prsctp_enable
;
6521 if (put_user(len
, optlen
))
6524 if (copy_to_user(optval
, ¶ms
, len
))
6533 static int sctp_getsockopt_default_prinfo(struct sock
*sk
, int len
,
6534 char __user
*optval
,
6537 struct sctp_default_prinfo info
;
6538 struct sctp_association
*asoc
;
6539 int retval
= -EFAULT
;
6541 if (len
< sizeof(info
)) {
6547 if (copy_from_user(&info
, optval
, len
))
6550 asoc
= sctp_id2assoc(sk
, info
.pr_assoc_id
);
6552 info
.pr_policy
= SCTP_PR_POLICY(asoc
->default_flags
);
6553 info
.pr_value
= asoc
->default_timetolive
;
6554 } else if (!info
.pr_assoc_id
) {
6555 struct sctp_sock
*sp
= sctp_sk(sk
);
6557 info
.pr_policy
= SCTP_PR_POLICY(sp
->default_flags
);
6558 info
.pr_value
= sp
->default_timetolive
;
6564 if (put_user(len
, optlen
))
6567 if (copy_to_user(optval
, &info
, len
))
6576 static int sctp_getsockopt_pr_assocstatus(struct sock
*sk
, int len
,
6577 char __user
*optval
,
6580 struct sctp_prstatus params
;
6581 struct sctp_association
*asoc
;
6583 int retval
= -EINVAL
;
6585 if (len
< sizeof(params
))
6588 len
= sizeof(params
);
6589 if (copy_from_user(¶ms
, optval
, len
)) {
6594 policy
= params
.sprstat_policy
;
6595 if (policy
& ~SCTP_PR_SCTP_MASK
)
6598 asoc
= sctp_id2assoc(sk
, params
.sprstat_assoc_id
);
6602 if (policy
== SCTP_PR_SCTP_NONE
) {
6603 params
.sprstat_abandoned_unsent
= 0;
6604 params
.sprstat_abandoned_sent
= 0;
6605 for (policy
= 0; policy
<= SCTP_PR_INDEX(MAX
); policy
++) {
6606 params
.sprstat_abandoned_unsent
+=
6607 asoc
->abandoned_unsent
[policy
];
6608 params
.sprstat_abandoned_sent
+=
6609 asoc
->abandoned_sent
[policy
];
6612 params
.sprstat_abandoned_unsent
=
6613 asoc
->abandoned_unsent
[__SCTP_PR_INDEX(policy
)];
6614 params
.sprstat_abandoned_sent
=
6615 asoc
->abandoned_sent
[__SCTP_PR_INDEX(policy
)];
6618 if (put_user(len
, optlen
)) {
6623 if (copy_to_user(optval
, ¶ms
, len
)) {
6634 static int sctp_getsockopt_pr_streamstatus(struct sock
*sk
, int len
,
6635 char __user
*optval
,
6638 struct sctp_stream_out
*streamout
;
6639 struct sctp_association
*asoc
;
6640 struct sctp_prstatus params
;
6641 int retval
= -EINVAL
;
6644 if (len
< sizeof(params
))
6647 len
= sizeof(params
);
6648 if (copy_from_user(¶ms
, optval
, len
)) {
6653 policy
= params
.sprstat_policy
;
6654 if (policy
& ~SCTP_PR_SCTP_MASK
)
6657 asoc
= sctp_id2assoc(sk
, params
.sprstat_assoc_id
);
6658 if (!asoc
|| params
.sprstat_sid
>= asoc
->stream
.outcnt
)
6661 streamout
= &asoc
->stream
.out
[params
.sprstat_sid
];
6662 if (policy
== SCTP_PR_SCTP_NONE
) {
6663 params
.sprstat_abandoned_unsent
= 0;
6664 params
.sprstat_abandoned_sent
= 0;
6665 for (policy
= 0; policy
<= SCTP_PR_INDEX(MAX
); policy
++) {
6666 params
.sprstat_abandoned_unsent
+=
6667 streamout
->abandoned_unsent
[policy
];
6668 params
.sprstat_abandoned_sent
+=
6669 streamout
->abandoned_sent
[policy
];
6672 params
.sprstat_abandoned_unsent
=
6673 streamout
->abandoned_unsent
[__SCTP_PR_INDEX(policy
)];
6674 params
.sprstat_abandoned_sent
=
6675 streamout
->abandoned_sent
[__SCTP_PR_INDEX(policy
)];
6678 if (put_user(len
, optlen
) || copy_to_user(optval
, ¶ms
, len
)) {
6689 static int sctp_getsockopt_reconfig_supported(struct sock
*sk
, int len
,
6690 char __user
*optval
,
6693 struct sctp_assoc_value params
;
6694 struct sctp_association
*asoc
;
6695 int retval
= -EFAULT
;
6697 if (len
< sizeof(params
)) {
6702 len
= sizeof(params
);
6703 if (copy_from_user(¶ms
, optval
, len
))
6706 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6708 params
.assoc_value
= asoc
->reconf_enable
;
6709 } else if (!params
.assoc_id
) {
6710 struct sctp_sock
*sp
= sctp_sk(sk
);
6712 params
.assoc_value
= sp
->ep
->reconf_enable
;
6718 if (put_user(len
, optlen
))
6721 if (copy_to_user(optval
, ¶ms
, len
))
6730 static int sctp_getsockopt_enable_strreset(struct sock
*sk
, int len
,
6731 char __user
*optval
,
6734 struct sctp_assoc_value params
;
6735 struct sctp_association
*asoc
;
6736 int retval
= -EFAULT
;
6738 if (len
< sizeof(params
)) {
6743 len
= sizeof(params
);
6744 if (copy_from_user(¶ms
, optval
, len
))
6747 asoc
= sctp_id2assoc(sk
, params
.assoc_id
);
6749 params
.assoc_value
= asoc
->strreset_enable
;
6750 } else if (!params
.assoc_id
) {
6751 struct sctp_sock
*sp
= sctp_sk(sk
);
6753 params
.assoc_value
= sp
->ep
->strreset_enable
;
6759 if (put_user(len
, optlen
))
6762 if (copy_to_user(optval
, ¶ms
, len
))
6771 static int sctp_getsockopt(struct sock
*sk
, int level
, int optname
,
6772 char __user
*optval
, int __user
*optlen
)
6777 pr_debug("%s: sk:%p, optname:%d\n", __func__
, sk
, optname
);
6779 /* I can hardly begin to describe how wrong this is. This is
6780 * so broken as to be worse than useless. The API draft
6781 * REALLY is NOT helpful here... I am not convinced that the
6782 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
6783 * are at all well-founded.
6785 if (level
!= SOL_SCTP
) {
6786 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
6788 retval
= af
->getsockopt(sk
, level
, optname
, optval
, optlen
);
6792 if (get_user(len
, optlen
))
6802 retval
= sctp_getsockopt_sctp_status(sk
, len
, optval
, optlen
);
6804 case SCTP_DISABLE_FRAGMENTS
:
6805 retval
= sctp_getsockopt_disable_fragments(sk
, len
, optval
,
6809 retval
= sctp_getsockopt_events(sk
, len
, optval
, optlen
);
6811 case SCTP_AUTOCLOSE
:
6812 retval
= sctp_getsockopt_autoclose(sk
, len
, optval
, optlen
);
6814 case SCTP_SOCKOPT_PEELOFF
:
6815 retval
= sctp_getsockopt_peeloff(sk
, len
, optval
, optlen
);
6817 case SCTP_SOCKOPT_PEELOFF_FLAGS
:
6818 retval
= sctp_getsockopt_peeloff_flags(sk
, len
, optval
, optlen
);
6820 case SCTP_PEER_ADDR_PARAMS
:
6821 retval
= sctp_getsockopt_peer_addr_params(sk
, len
, optval
,
6824 case SCTP_DELAYED_SACK
:
6825 retval
= sctp_getsockopt_delayed_ack(sk
, len
, optval
,
6829 retval
= sctp_getsockopt_initmsg(sk
, len
, optval
, optlen
);
6831 case SCTP_GET_PEER_ADDRS
:
6832 retval
= sctp_getsockopt_peer_addrs(sk
, len
, optval
,
6835 case SCTP_GET_LOCAL_ADDRS
:
6836 retval
= sctp_getsockopt_local_addrs(sk
, len
, optval
,
6839 case SCTP_SOCKOPT_CONNECTX3
:
6840 retval
= sctp_getsockopt_connectx3(sk
, len
, optval
, optlen
);
6842 case SCTP_DEFAULT_SEND_PARAM
:
6843 retval
= sctp_getsockopt_default_send_param(sk
, len
,
6846 case SCTP_DEFAULT_SNDINFO
:
6847 retval
= sctp_getsockopt_default_sndinfo(sk
, len
,
6850 case SCTP_PRIMARY_ADDR
:
6851 retval
= sctp_getsockopt_primary_addr(sk
, len
, optval
, optlen
);
6854 retval
= sctp_getsockopt_nodelay(sk
, len
, optval
, optlen
);
6857 retval
= sctp_getsockopt_rtoinfo(sk
, len
, optval
, optlen
);
6859 case SCTP_ASSOCINFO
:
6860 retval
= sctp_getsockopt_associnfo(sk
, len
, optval
, optlen
);
6862 case SCTP_I_WANT_MAPPED_V4_ADDR
:
6863 retval
= sctp_getsockopt_mappedv4(sk
, len
, optval
, optlen
);
6866 retval
= sctp_getsockopt_maxseg(sk
, len
, optval
, optlen
);
6868 case SCTP_GET_PEER_ADDR_INFO
:
6869 retval
= sctp_getsockopt_peer_addr_info(sk
, len
, optval
,
6872 case SCTP_ADAPTATION_LAYER
:
6873 retval
= sctp_getsockopt_adaptation_layer(sk
, len
, optval
,
6877 retval
= sctp_getsockopt_context(sk
, len
, optval
, optlen
);
6879 case SCTP_FRAGMENT_INTERLEAVE
:
6880 retval
= sctp_getsockopt_fragment_interleave(sk
, len
, optval
,
6883 case SCTP_PARTIAL_DELIVERY_POINT
:
6884 retval
= sctp_getsockopt_partial_delivery_point(sk
, len
, optval
,
6887 case SCTP_MAX_BURST
:
6888 retval
= sctp_getsockopt_maxburst(sk
, len
, optval
, optlen
);
6891 case SCTP_AUTH_CHUNK
:
6892 case SCTP_AUTH_DELETE_KEY
:
6893 retval
= -EOPNOTSUPP
;
6895 case SCTP_HMAC_IDENT
:
6896 retval
= sctp_getsockopt_hmac_ident(sk
, len
, optval
, optlen
);
6898 case SCTP_AUTH_ACTIVE_KEY
:
6899 retval
= sctp_getsockopt_active_key(sk
, len
, optval
, optlen
);
6901 case SCTP_PEER_AUTH_CHUNKS
:
6902 retval
= sctp_getsockopt_peer_auth_chunks(sk
, len
, optval
,
6905 case SCTP_LOCAL_AUTH_CHUNKS
:
6906 retval
= sctp_getsockopt_local_auth_chunks(sk
, len
, optval
,
6909 case SCTP_GET_ASSOC_NUMBER
:
6910 retval
= sctp_getsockopt_assoc_number(sk
, len
, optval
, optlen
);
6912 case SCTP_GET_ASSOC_ID_LIST
:
6913 retval
= sctp_getsockopt_assoc_ids(sk
, len
, optval
, optlen
);
6915 case SCTP_AUTO_ASCONF
:
6916 retval
= sctp_getsockopt_auto_asconf(sk
, len
, optval
, optlen
);
6918 case SCTP_PEER_ADDR_THLDS
:
6919 retval
= sctp_getsockopt_paddr_thresholds(sk
, optval
, len
, optlen
);
6921 case SCTP_GET_ASSOC_STATS
:
6922 retval
= sctp_getsockopt_assoc_stats(sk
, len
, optval
, optlen
);
6924 case SCTP_RECVRCVINFO
:
6925 retval
= sctp_getsockopt_recvrcvinfo(sk
, len
, optval
, optlen
);
6927 case SCTP_RECVNXTINFO
:
6928 retval
= sctp_getsockopt_recvnxtinfo(sk
, len
, optval
, optlen
);
6930 case SCTP_PR_SUPPORTED
:
6931 retval
= sctp_getsockopt_pr_supported(sk
, len
, optval
, optlen
);
6933 case SCTP_DEFAULT_PRINFO
:
6934 retval
= sctp_getsockopt_default_prinfo(sk
, len
, optval
,
6937 case SCTP_PR_ASSOC_STATUS
:
6938 retval
= sctp_getsockopt_pr_assocstatus(sk
, len
, optval
,
6941 case SCTP_PR_STREAM_STATUS
:
6942 retval
= sctp_getsockopt_pr_streamstatus(sk
, len
, optval
,
6945 case SCTP_RECONFIG_SUPPORTED
:
6946 retval
= sctp_getsockopt_reconfig_supported(sk
, len
, optval
,
6949 case SCTP_ENABLE_STREAM_RESET
:
6950 retval
= sctp_getsockopt_enable_strreset(sk
, len
, optval
,
6954 retval
= -ENOPROTOOPT
;
6962 static int sctp_hash(struct sock
*sk
)
6968 static void sctp_unhash(struct sock
*sk
)
6973 /* Check if port is acceptable. Possibly find first available port.
6975 * The port hash table (contained in the 'global' SCTP protocol storage
6976 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6977 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6978 * list (the list number is the port number hashed out, so as you
6979 * would expect from a hash function, all the ports in a given list have
6980 * such a number that hashes out to the same list number; you were
6981 * expecting that, right?); so each list has a set of ports, with a
6982 * link to the socket (struct sock) that uses it, the port number and
6983 * a fastreuse flag (FIXME: NPI ipg).
6985 static struct sctp_bind_bucket
*sctp_bucket_create(
6986 struct sctp_bind_hashbucket
*head
, struct net
*, unsigned short snum
);
6988 static long sctp_get_port_local(struct sock
*sk
, union sctp_addr
*addr
)
6990 struct sctp_bind_hashbucket
*head
; /* hash list */
6991 struct sctp_bind_bucket
*pp
;
6992 unsigned short snum
;
6995 snum
= ntohs(addr
->v4
.sin_port
);
6997 pr_debug("%s: begins, snum:%d\n", __func__
, snum
);
7002 /* Search for an available port. */
7003 int low
, high
, remaining
, index
;
7005 struct net
*net
= sock_net(sk
);
7007 inet_get_local_port_range(net
, &low
, &high
);
7008 remaining
= (high
- low
) + 1;
7009 rover
= prandom_u32() % remaining
+ low
;
7013 if ((rover
< low
) || (rover
> high
))
7015 if (inet_is_local_reserved_port(net
, rover
))
7017 index
= sctp_phashfn(sock_net(sk
), rover
);
7018 head
= &sctp_port_hashtable
[index
];
7019 spin_lock(&head
->lock
);
7020 sctp_for_each_hentry(pp
, &head
->chain
)
7021 if ((pp
->port
== rover
) &&
7022 net_eq(sock_net(sk
), pp
->net
))
7026 spin_unlock(&head
->lock
);
7027 } while (--remaining
> 0);
7029 /* Exhausted local port range during search? */
7034 /* OK, here is the one we will use. HEAD (the port
7035 * hash table list entry) is non-NULL and we hold it's
7040 /* We are given an specific port number; we verify
7041 * that it is not being used. If it is used, we will
7042 * exahust the search in the hash list corresponding
7043 * to the port number (snum) - we detect that with the
7044 * port iterator, pp being NULL.
7046 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
), snum
)];
7047 spin_lock(&head
->lock
);
7048 sctp_for_each_hentry(pp
, &head
->chain
) {
7049 if ((pp
->port
== snum
) && net_eq(pp
->net
, sock_net(sk
)))
7056 if (!hlist_empty(&pp
->owner
)) {
7057 /* We had a port hash table hit - there is an
7058 * available port (pp != NULL) and it is being
7059 * used by other socket (pp->owner not empty); that other
7060 * socket is going to be sk2.
7062 int reuse
= sk
->sk_reuse
;
7065 pr_debug("%s: found a possible match\n", __func__
);
7067 if (pp
->fastreuse
&& sk
->sk_reuse
&&
7068 sk
->sk_state
!= SCTP_SS_LISTENING
)
7071 /* Run through the list of sockets bound to the port
7072 * (pp->port) [via the pointers bind_next and
7073 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
7074 * we get the endpoint they describe and run through
7075 * the endpoint's list of IP (v4 or v6) addresses,
7076 * comparing each of the addresses with the address of
7077 * the socket sk. If we find a match, then that means
7078 * that this port/socket (sk) combination are already
7081 sk_for_each_bound(sk2
, &pp
->owner
) {
7082 struct sctp_endpoint
*ep2
;
7083 ep2
= sctp_sk(sk2
)->ep
;
7086 (reuse
&& sk2
->sk_reuse
&&
7087 sk2
->sk_state
!= SCTP_SS_LISTENING
))
7090 if (sctp_bind_addr_conflict(&ep2
->base
.bind_addr
, addr
,
7091 sctp_sk(sk2
), sctp_sk(sk
))) {
7097 pr_debug("%s: found a match\n", __func__
);
7100 /* If there was a hash table miss, create a new port. */
7102 if (!pp
&& !(pp
= sctp_bucket_create(head
, sock_net(sk
), snum
)))
7105 /* In either case (hit or miss), make sure fastreuse is 1 only
7106 * if sk->sk_reuse is too (that is, if the caller requested
7107 * SO_REUSEADDR on this socket -sk-).
7109 if (hlist_empty(&pp
->owner
)) {
7110 if (sk
->sk_reuse
&& sk
->sk_state
!= SCTP_SS_LISTENING
)
7114 } else if (pp
->fastreuse
&&
7115 (!sk
->sk_reuse
|| sk
->sk_state
== SCTP_SS_LISTENING
))
7118 /* We are set, so fill up all the data in the hash table
7119 * entry, tie the socket list information with the rest of the
7120 * sockets FIXME: Blurry, NPI (ipg).
7123 if (!sctp_sk(sk
)->bind_hash
) {
7124 inet_sk(sk
)->inet_num
= snum
;
7125 sk_add_bind_node(sk
, &pp
->owner
);
7126 sctp_sk(sk
)->bind_hash
= pp
;
7131 spin_unlock(&head
->lock
);
7138 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
7139 * port is requested.
7141 static int sctp_get_port(struct sock
*sk
, unsigned short snum
)
7143 union sctp_addr addr
;
7144 struct sctp_af
*af
= sctp_sk(sk
)->pf
->af
;
7146 /* Set up a dummy address struct from the sk. */
7147 af
->from_sk(&addr
, sk
);
7148 addr
.v4
.sin_port
= htons(snum
);
7150 /* Note: sk->sk_num gets filled in if ephemeral port request. */
7151 return !!sctp_get_port_local(sk
, &addr
);
7155 * Move a socket to LISTENING state.
7157 static int sctp_listen_start(struct sock
*sk
, int backlog
)
7159 struct sctp_sock
*sp
= sctp_sk(sk
);
7160 struct sctp_endpoint
*ep
= sp
->ep
;
7161 struct crypto_shash
*tfm
= NULL
;
7164 /* Allocate HMAC for generating cookie. */
7165 if (!sp
->hmac
&& sp
->sctp_hmac_alg
) {
7166 sprintf(alg
, "hmac(%s)", sp
->sctp_hmac_alg
);
7167 tfm
= crypto_alloc_shash(alg
, 0, 0);
7169 net_info_ratelimited("failed to load transform for %s: %ld\n",
7170 sp
->sctp_hmac_alg
, PTR_ERR(tfm
));
7173 sctp_sk(sk
)->hmac
= tfm
;
7177 * If a bind() or sctp_bindx() is not called prior to a listen()
7178 * call that allows new associations to be accepted, the system
7179 * picks an ephemeral port and will choose an address set equivalent
7180 * to binding with a wildcard address.
7182 * This is not currently spelled out in the SCTP sockets
7183 * extensions draft, but follows the practice as seen in TCP
7187 sk
->sk_state
= SCTP_SS_LISTENING
;
7188 if (!ep
->base
.bind_addr
.port
) {
7189 if (sctp_autobind(sk
))
7192 if (sctp_get_port(sk
, inet_sk(sk
)->inet_num
)) {
7193 sk
->sk_state
= SCTP_SS_CLOSED
;
7198 sk
->sk_max_ack_backlog
= backlog
;
7199 sctp_hash_endpoint(ep
);
7204 * 4.1.3 / 5.1.3 listen()
7206 * By default, new associations are not accepted for UDP style sockets.
7207 * An application uses listen() to mark a socket as being able to
7208 * accept new associations.
7210 * On TCP style sockets, applications use listen() to ready the SCTP
7211 * endpoint for accepting inbound associations.
7213 * On both types of endpoints a backlog of '0' disables listening.
7215 * Move a socket to LISTENING state.
7217 int sctp_inet_listen(struct socket
*sock
, int backlog
)
7219 struct sock
*sk
= sock
->sk
;
7220 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
7223 if (unlikely(backlog
< 0))
7228 /* Peeled-off sockets are not allowed to listen(). */
7229 if (sctp_style(sk
, UDP_HIGH_BANDWIDTH
))
7232 if (sock
->state
!= SS_UNCONNECTED
)
7235 if (!sctp_sstate(sk
, LISTENING
) && !sctp_sstate(sk
, CLOSED
))
7238 /* If backlog is zero, disable listening. */
7240 if (sctp_sstate(sk
, CLOSED
))
7244 sctp_unhash_endpoint(ep
);
7245 sk
->sk_state
= SCTP_SS_CLOSED
;
7247 sctp_sk(sk
)->bind_hash
->fastreuse
= 1;
7251 /* If we are already listening, just update the backlog */
7252 if (sctp_sstate(sk
, LISTENING
))
7253 sk
->sk_max_ack_backlog
= backlog
;
7255 err
= sctp_listen_start(sk
, backlog
);
7267 * This function is done by modeling the current datagram_poll() and the
7268 * tcp_poll(). Note that, based on these implementations, we don't
7269 * lock the socket in this function, even though it seems that,
7270 * ideally, locking or some other mechanisms can be used to ensure
7271 * the integrity of the counters (sndbuf and wmem_alloc) used
7272 * in this place. We assume that we don't need locks either until proven
7275 * Another thing to note is that we include the Async I/O support
7276 * here, again, by modeling the current TCP/UDP code. We don't have
7277 * a good way to test with it yet.
7279 unsigned int sctp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
7281 struct sock
*sk
= sock
->sk
;
7282 struct sctp_sock
*sp
= sctp_sk(sk
);
7285 poll_wait(file
, sk_sleep(sk
), wait
);
7287 sock_rps_record_flow(sk
);
7289 /* A TCP-style listening socket becomes readable when the accept queue
7292 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
))
7293 return (!list_empty(&sp
->ep
->asocs
)) ?
7294 (POLLIN
| POLLRDNORM
) : 0;
7298 /* Is there any exceptional events? */
7299 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
7301 (sock_flag(sk
, SOCK_SELECT_ERR_QUEUE
) ? POLLPRI
: 0);
7302 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7303 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
7304 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
7307 /* Is it readable? Reconsider this code with TCP-style support. */
7308 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7309 mask
|= POLLIN
| POLLRDNORM
;
7311 /* The association is either gone or not ready. */
7312 if (!sctp_style(sk
, UDP
) && sctp_sstate(sk
, CLOSED
))
7315 /* Is it writable? */
7316 if (sctp_writeable(sk
)) {
7317 mask
|= POLLOUT
| POLLWRNORM
;
7319 sk_set_bit(SOCKWQ_ASYNC_NOSPACE
, sk
);
7321 * Since the socket is not locked, the buffer
7322 * might be made available after the writeable check and
7323 * before the bit is set. This could cause a lost I/O
7324 * signal. tcp_poll() has a race breaker for this race
7325 * condition. Based on their implementation, we put
7326 * in the following code to cover it as well.
7328 if (sctp_writeable(sk
))
7329 mask
|= POLLOUT
| POLLWRNORM
;
7334 /********************************************************************
7335 * 2nd Level Abstractions
7336 ********************************************************************/
7338 static struct sctp_bind_bucket
*sctp_bucket_create(
7339 struct sctp_bind_hashbucket
*head
, struct net
*net
, unsigned short snum
)
7341 struct sctp_bind_bucket
*pp
;
7343 pp
= kmem_cache_alloc(sctp_bucket_cachep
, GFP_ATOMIC
);
7345 SCTP_DBG_OBJCNT_INC(bind_bucket
);
7348 INIT_HLIST_HEAD(&pp
->owner
);
7350 hlist_add_head(&pp
->node
, &head
->chain
);
7355 /* Caller must hold hashbucket lock for this tb with local BH disabled */
7356 static void sctp_bucket_destroy(struct sctp_bind_bucket
*pp
)
7358 if (pp
&& hlist_empty(&pp
->owner
)) {
7359 __hlist_del(&pp
->node
);
7360 kmem_cache_free(sctp_bucket_cachep
, pp
);
7361 SCTP_DBG_OBJCNT_DEC(bind_bucket
);
7365 /* Release this socket's reference to a local port. */
7366 static inline void __sctp_put_port(struct sock
*sk
)
7368 struct sctp_bind_hashbucket
*head
=
7369 &sctp_port_hashtable
[sctp_phashfn(sock_net(sk
),
7370 inet_sk(sk
)->inet_num
)];
7371 struct sctp_bind_bucket
*pp
;
7373 spin_lock(&head
->lock
);
7374 pp
= sctp_sk(sk
)->bind_hash
;
7375 __sk_del_bind_node(sk
);
7376 sctp_sk(sk
)->bind_hash
= NULL
;
7377 inet_sk(sk
)->inet_num
= 0;
7378 sctp_bucket_destroy(pp
);
7379 spin_unlock(&head
->lock
);
7382 void sctp_put_port(struct sock
*sk
)
7385 __sctp_put_port(sk
);
7390 * The system picks an ephemeral port and choose an address set equivalent
7391 * to binding with a wildcard address.
7392 * One of those addresses will be the primary address for the association.
7393 * This automatically enables the multihoming capability of SCTP.
7395 static int sctp_autobind(struct sock
*sk
)
7397 union sctp_addr autoaddr
;
7401 /* Initialize a local sockaddr structure to INADDR_ANY. */
7402 af
= sctp_sk(sk
)->pf
->af
;
7404 port
= htons(inet_sk(sk
)->inet_num
);
7405 af
->inaddr_any(&autoaddr
, port
);
7407 return sctp_do_bind(sk
, &autoaddr
, af
->sockaddr_len
);
7410 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
7413 * 4.2 The cmsghdr Structure *
7415 * When ancillary data is sent or received, any number of ancillary data
7416 * objects can be specified by the msg_control and msg_controllen members of
7417 * the msghdr structure, because each object is preceded by
7418 * a cmsghdr structure defining the object's length (the cmsg_len member).
7419 * Historically Berkeley-derived implementations have passed only one object
7420 * at a time, but this API allows multiple objects to be
7421 * passed in a single call to sendmsg() or recvmsg(). The following example
7422 * shows two ancillary data objects in a control buffer.
7424 * |<--------------------------- msg_controllen -------------------------->|
7427 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
7429 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
7432 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
7434 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
7437 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7438 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
7440 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
7442 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7449 static int sctp_msghdr_parse(const struct msghdr
*msg
, struct sctp_cmsgs
*cmsgs
)
7451 struct msghdr
*my_msg
= (struct msghdr
*)msg
;
7452 struct cmsghdr
*cmsg
;
7454 for_each_cmsghdr(cmsg
, my_msg
) {
7455 if (!CMSG_OK(my_msg
, cmsg
))
7458 /* Should we parse this header or ignore? */
7459 if (cmsg
->cmsg_level
!= IPPROTO_SCTP
)
7462 /* Strictly check lengths following example in SCM code. */
7463 switch (cmsg
->cmsg_type
) {
7465 /* SCTP Socket API Extension
7466 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
7468 * This cmsghdr structure provides information for
7469 * initializing new SCTP associations with sendmsg().
7470 * The SCTP_INITMSG socket option uses this same data
7471 * structure. This structure is not used for
7474 * cmsg_level cmsg_type cmsg_data[]
7475 * ------------ ------------ ----------------------
7476 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
7478 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_initmsg
)))
7481 cmsgs
->init
= CMSG_DATA(cmsg
);
7485 /* SCTP Socket API Extension
7486 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
7488 * This cmsghdr structure specifies SCTP options for
7489 * sendmsg() and describes SCTP header information
7490 * about a received message through recvmsg().
7492 * cmsg_level cmsg_type cmsg_data[]
7493 * ------------ ------------ ----------------------
7494 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
7496 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_sndrcvinfo
)))
7499 cmsgs
->srinfo
= CMSG_DATA(cmsg
);
7501 if (cmsgs
->srinfo
->sinfo_flags
&
7502 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
7503 SCTP_SACK_IMMEDIATELY
| SCTP_PR_SCTP_MASK
|
7504 SCTP_ABORT
| SCTP_EOF
))
7509 /* SCTP Socket API Extension
7510 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
7512 * This cmsghdr structure specifies SCTP options for
7513 * sendmsg(). This structure and SCTP_RCVINFO replaces
7514 * SCTP_SNDRCV which has been deprecated.
7516 * cmsg_level cmsg_type cmsg_data[]
7517 * ------------ ------------ ---------------------
7518 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
7520 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(struct sctp_sndinfo
)))
7523 cmsgs
->sinfo
= CMSG_DATA(cmsg
);
7525 if (cmsgs
->sinfo
->snd_flags
&
7526 ~(SCTP_UNORDERED
| SCTP_ADDR_OVER
|
7527 SCTP_SACK_IMMEDIATELY
| SCTP_PR_SCTP_MASK
|
7528 SCTP_ABORT
| SCTP_EOF
))
7540 * Wait for a packet..
7541 * Note: This function is the same function as in core/datagram.c
7542 * with a few modifications to make lksctp work.
7544 static int sctp_wait_for_packet(struct sock
*sk
, int *err
, long *timeo_p
)
7549 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
7551 /* Socket errors? */
7552 error
= sock_error(sk
);
7556 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7559 /* Socket shut down? */
7560 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7563 /* Sequenced packets can come disconnected. If so we report the
7568 /* Is there a good reason to think that we may receive some data? */
7569 if (list_empty(&sctp_sk(sk
)->ep
->asocs
) && !sctp_sstate(sk
, LISTENING
))
7572 /* Handle signals. */
7573 if (signal_pending(current
))
7576 /* Let another process have a go. Since we are going to sleep
7577 * anyway. Note: This may cause odd behaviors if the message
7578 * does not fit in the user's buffer, but this seems to be the
7579 * only way to honor MSG_DONTWAIT realistically.
7582 *timeo_p
= schedule_timeout(*timeo_p
);
7586 finish_wait(sk_sleep(sk
), &wait
);
7590 error
= sock_intr_errno(*timeo_p
);
7593 finish_wait(sk_sleep(sk
), &wait
);
7598 /* Receive a datagram.
7599 * Note: This is pretty much the same routine as in core/datagram.c
7600 * with a few changes to make lksctp work.
7602 struct sk_buff
*sctp_skb_recv_datagram(struct sock
*sk
, int flags
,
7603 int noblock
, int *err
)
7606 struct sk_buff
*skb
;
7609 timeo
= sock_rcvtimeo(sk
, noblock
);
7611 pr_debug("%s: timeo:%ld, max:%ld\n", __func__
, timeo
,
7612 MAX_SCHEDULE_TIMEOUT
);
7615 /* Again only user level code calls this function,
7616 * so nothing interrupt level
7617 * will suddenly eat the receive_queue.
7619 * Look at current nfs client by the way...
7620 * However, this function was correct in any case. 8)
7622 if (flags
& MSG_PEEK
) {
7623 skb
= skb_peek(&sk
->sk_receive_queue
);
7625 refcount_inc(&skb
->users
);
7627 skb
= __skb_dequeue(&sk
->sk_receive_queue
);
7633 /* Caller is allowed not to check sk->sk_err before calling. */
7634 error
= sock_error(sk
);
7638 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7641 if (sk_can_busy_loop(sk
)) {
7642 sk_busy_loop(sk
, noblock
);
7644 if (!skb_queue_empty(&sk
->sk_receive_queue
))
7648 /* User doesn't want to wait. */
7652 } while (sctp_wait_for_packet(sk
, err
, &timeo
) == 0);
7661 /* If sndbuf has changed, wake up per association sndbuf waiters. */
7662 static void __sctp_write_space(struct sctp_association
*asoc
)
7664 struct sock
*sk
= asoc
->base
.sk
;
7666 if (sctp_wspace(asoc
) <= 0)
7669 if (waitqueue_active(&asoc
->wait
))
7670 wake_up_interruptible(&asoc
->wait
);
7672 if (sctp_writeable(sk
)) {
7673 struct socket_wq
*wq
;
7676 wq
= rcu_dereference(sk
->sk_wq
);
7678 if (waitqueue_active(&wq
->wait
))
7679 wake_up_interruptible(&wq
->wait
);
7681 /* Note that we try to include the Async I/O support
7682 * here by modeling from the current TCP/UDP code.
7683 * We have not tested with it yet.
7685 if (!(sk
->sk_shutdown
& SEND_SHUTDOWN
))
7686 sock_wake_async(wq
, SOCK_WAKE_SPACE
, POLL_OUT
);
7692 static void sctp_wake_up_waiters(struct sock
*sk
,
7693 struct sctp_association
*asoc
)
7695 struct sctp_association
*tmp
= asoc
;
7697 /* We do accounting for the sndbuf space per association,
7698 * so we only need to wake our own association.
7700 if (asoc
->ep
->sndbuf_policy
)
7701 return __sctp_write_space(asoc
);
7703 /* If association goes down and is just flushing its
7704 * outq, then just normally notify others.
7706 if (asoc
->base
.dead
)
7707 return sctp_write_space(sk
);
7709 /* Accounting for the sndbuf space is per socket, so we
7710 * need to wake up others, try to be fair and in case of
7711 * other associations, let them have a go first instead
7712 * of just doing a sctp_write_space() call.
7714 * Note that we reach sctp_wake_up_waiters() only when
7715 * associations free up queued chunks, thus we are under
7716 * lock and the list of associations on a socket is
7717 * guaranteed not to change.
7719 for (tmp
= list_next_entry(tmp
, asocs
); 1;
7720 tmp
= list_next_entry(tmp
, asocs
)) {
7721 /* Manually skip the head element. */
7722 if (&tmp
->asocs
== &((sctp_sk(sk
))->ep
->asocs
))
7724 /* Wake up association. */
7725 __sctp_write_space(tmp
);
7726 /* We've reached the end. */
7732 /* Do accounting for the sndbuf space.
7733 * Decrement the used sndbuf space of the corresponding association by the
7734 * data size which was just transmitted(freed).
7736 static void sctp_wfree(struct sk_buff
*skb
)
7738 struct sctp_chunk
*chunk
= skb_shinfo(skb
)->destructor_arg
;
7739 struct sctp_association
*asoc
= chunk
->asoc
;
7740 struct sock
*sk
= asoc
->base
.sk
;
7742 asoc
->sndbuf_used
-= SCTP_DATA_SNDSIZE(chunk
) +
7743 sizeof(struct sk_buff
) +
7744 sizeof(struct sctp_chunk
);
7746 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk
), &sk
->sk_wmem_alloc
));
7749 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
7751 sk
->sk_wmem_queued
-= skb
->truesize
;
7752 sk_mem_uncharge(sk
, skb
->truesize
);
7755 sctp_wake_up_waiters(sk
, asoc
);
7757 sctp_association_put(asoc
);
7760 /* Do accounting for the receive space on the socket.
7761 * Accounting for the association is done in ulpevent.c
7762 * We set this as a destructor for the cloned data skbs so that
7763 * accounting is done at the correct time.
7765 void sctp_sock_rfree(struct sk_buff
*skb
)
7767 struct sock
*sk
= skb
->sk
;
7768 struct sctp_ulpevent
*event
= sctp_skb2event(skb
);
7770 atomic_sub(event
->rmem_len
, &sk
->sk_rmem_alloc
);
7773 * Mimic the behavior of sock_rfree
7775 sk_mem_uncharge(sk
, event
->rmem_len
);
7779 /* Helper function to wait for space in the sndbuf. */
7780 static int sctp_wait_for_sndbuf(struct sctp_association
*asoc
, long *timeo_p
,
7783 struct sock
*sk
= asoc
->base
.sk
;
7785 long current_timeo
= *timeo_p
;
7788 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__
, asoc
,
7791 /* Increment the association's refcnt. */
7792 sctp_association_hold(asoc
);
7794 /* Wait on the association specific sndbuf space. */
7796 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
7797 TASK_INTERRUPTIBLE
);
7800 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
7803 if (signal_pending(current
))
7804 goto do_interrupted
;
7805 if (msg_len
<= sctp_wspace(asoc
))
7808 /* Let another process have a go. Since we are going
7812 current_timeo
= schedule_timeout(current_timeo
);
7815 *timeo_p
= current_timeo
;
7819 finish_wait(&asoc
->wait
, &wait
);
7821 /* Release the association's refcnt. */
7822 sctp_association_put(asoc
);
7831 err
= sock_intr_errno(*timeo_p
);
7839 void sctp_data_ready(struct sock
*sk
)
7841 struct socket_wq
*wq
;
7844 wq
= rcu_dereference(sk
->sk_wq
);
7845 if (skwq_has_sleeper(wq
))
7846 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
7847 POLLRDNORM
| POLLRDBAND
);
7848 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
7852 /* If socket sndbuf has changed, wake up all per association waiters. */
7853 void sctp_write_space(struct sock
*sk
)
7855 struct sctp_association
*asoc
;
7857 /* Wake up the tasks in each wait queue. */
7858 list_for_each_entry(asoc
, &((sctp_sk(sk
))->ep
->asocs
), asocs
) {
7859 __sctp_write_space(asoc
);
7863 /* Is there any sndbuf space available on the socket?
7865 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
7866 * associations on the same socket. For a UDP-style socket with
7867 * multiple associations, it is possible for it to be "unwriteable"
7868 * prematurely. I assume that this is acceptable because
7869 * a premature "unwriteable" is better than an accidental "writeable" which
7870 * would cause an unwanted block under certain circumstances. For the 1-1
7871 * UDP-style sockets or TCP-style sockets, this code should work.
7874 static int sctp_writeable(struct sock
*sk
)
7878 amt
= sk
->sk_sndbuf
- sk_wmem_alloc_get(sk
);
7884 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7885 * returns immediately with EINPROGRESS.
7887 static int sctp_wait_for_connect(struct sctp_association
*asoc
, long *timeo_p
)
7889 struct sock
*sk
= asoc
->base
.sk
;
7891 long current_timeo
= *timeo_p
;
7894 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__
, asoc
, *timeo_p
);
7896 /* Increment the association's refcnt. */
7897 sctp_association_hold(asoc
);
7900 prepare_to_wait_exclusive(&asoc
->wait
, &wait
,
7901 TASK_INTERRUPTIBLE
);
7904 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
7906 if (sk
->sk_err
|| asoc
->state
>= SCTP_STATE_SHUTDOWN_PENDING
||
7909 if (signal_pending(current
))
7910 goto do_interrupted
;
7912 if (sctp_state(asoc
, ESTABLISHED
))
7915 /* Let another process have a go. Since we are going
7919 current_timeo
= schedule_timeout(current_timeo
);
7922 *timeo_p
= current_timeo
;
7926 finish_wait(&asoc
->wait
, &wait
);
7928 /* Release the association's refcnt. */
7929 sctp_association_put(asoc
);
7934 if (asoc
->init_err_counter
+ 1 > asoc
->max_init_attempts
)
7937 err
= -ECONNREFUSED
;
7941 err
= sock_intr_errno(*timeo_p
);
7949 static int sctp_wait_for_accept(struct sock
*sk
, long timeo
)
7951 struct sctp_endpoint
*ep
;
7955 ep
= sctp_sk(sk
)->ep
;
7959 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
7960 TASK_INTERRUPTIBLE
);
7962 if (list_empty(&ep
->asocs
)) {
7964 timeo
= schedule_timeout(timeo
);
7969 if (!sctp_sstate(sk
, LISTENING
))
7973 if (!list_empty(&ep
->asocs
))
7976 err
= sock_intr_errno(timeo
);
7977 if (signal_pending(current
))
7985 finish_wait(sk_sleep(sk
), &wait
);
7990 static void sctp_wait_for_close(struct sock
*sk
, long timeout
)
7995 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
7996 if (list_empty(&sctp_sk(sk
)->ep
->asocs
))
7999 timeout
= schedule_timeout(timeout
);
8001 } while (!signal_pending(current
) && timeout
);
8003 finish_wait(sk_sleep(sk
), &wait
);
8006 static void sctp_skb_set_owner_r_frag(struct sk_buff
*skb
, struct sock
*sk
)
8008 struct sk_buff
*frag
;
8013 /* Don't forget the fragments. */
8014 skb_walk_frags(skb
, frag
)
8015 sctp_skb_set_owner_r_frag(frag
, sk
);
8018 sctp_skb_set_owner_r(skb
, sk
);
8021 void sctp_copy_sock(struct sock
*newsk
, struct sock
*sk
,
8022 struct sctp_association
*asoc
)
8024 struct inet_sock
*inet
= inet_sk(sk
);
8025 struct inet_sock
*newinet
;
8027 newsk
->sk_type
= sk
->sk_type
;
8028 newsk
->sk_bound_dev_if
= sk
->sk_bound_dev_if
;
8029 newsk
->sk_flags
= sk
->sk_flags
;
8030 newsk
->sk_tsflags
= sk
->sk_tsflags
;
8031 newsk
->sk_no_check_tx
= sk
->sk_no_check_tx
;
8032 newsk
->sk_no_check_rx
= sk
->sk_no_check_rx
;
8033 newsk
->sk_reuse
= sk
->sk_reuse
;
8035 newsk
->sk_shutdown
= sk
->sk_shutdown
;
8036 newsk
->sk_destruct
= sctp_destruct_sock
;
8037 newsk
->sk_family
= sk
->sk_family
;
8038 newsk
->sk_protocol
= IPPROTO_SCTP
;
8039 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
8040 newsk
->sk_sndbuf
= sk
->sk_sndbuf
;
8041 newsk
->sk_rcvbuf
= sk
->sk_rcvbuf
;
8042 newsk
->sk_lingertime
= sk
->sk_lingertime
;
8043 newsk
->sk_rcvtimeo
= sk
->sk_rcvtimeo
;
8044 newsk
->sk_sndtimeo
= sk
->sk_sndtimeo
;
8045 newsk
->sk_rxhash
= sk
->sk_rxhash
;
8047 newinet
= inet_sk(newsk
);
8049 /* Initialize sk's sport, dport, rcv_saddr and daddr for
8050 * getsockname() and getpeername()
8052 newinet
->inet_sport
= inet
->inet_sport
;
8053 newinet
->inet_saddr
= inet
->inet_saddr
;
8054 newinet
->inet_rcv_saddr
= inet
->inet_rcv_saddr
;
8055 newinet
->inet_dport
= htons(asoc
->peer
.port
);
8056 newinet
->pmtudisc
= inet
->pmtudisc
;
8057 newinet
->inet_id
= asoc
->next_tsn
^ jiffies
;
8059 newinet
->uc_ttl
= inet
->uc_ttl
;
8060 newinet
->mc_loop
= 1;
8061 newinet
->mc_ttl
= 1;
8062 newinet
->mc_index
= 0;
8063 newinet
->mc_list
= NULL
;
8065 if (newsk
->sk_flags
& SK_FLAGS_TIMESTAMP
)
8066 net_enable_timestamp();
8068 security_sk_clone(sk
, newsk
);
8071 static inline void sctp_copy_descendant(struct sock
*sk_to
,
8072 const struct sock
*sk_from
)
8074 int ancestor_size
= sizeof(struct inet_sock
) +
8075 sizeof(struct sctp_sock
) -
8076 offsetof(struct sctp_sock
, auto_asconf_list
);
8078 if (sk_from
->sk_family
== PF_INET6
)
8079 ancestor_size
+= sizeof(struct ipv6_pinfo
);
8081 __inet_sk_copy_descendant(sk_to
, sk_from
, ancestor_size
);
8084 /* Populate the fields of the newsk from the oldsk and migrate the assoc
8085 * and its messages to the newsk.
8087 static void sctp_sock_migrate(struct sock
*oldsk
, struct sock
*newsk
,
8088 struct sctp_association
*assoc
,
8089 enum sctp_socket_type type
)
8091 struct sctp_sock
*oldsp
= sctp_sk(oldsk
);
8092 struct sctp_sock
*newsp
= sctp_sk(newsk
);
8093 struct sctp_bind_bucket
*pp
; /* hash list port iterator */
8094 struct sctp_endpoint
*newep
= newsp
->ep
;
8095 struct sk_buff
*skb
, *tmp
;
8096 struct sctp_ulpevent
*event
;
8097 struct sctp_bind_hashbucket
*head
;
8099 /* Migrate socket buffer sizes and all the socket level options to the
8102 newsk
->sk_sndbuf
= oldsk
->sk_sndbuf
;
8103 newsk
->sk_rcvbuf
= oldsk
->sk_rcvbuf
;
8104 /* Brute force copy old sctp opt. */
8105 sctp_copy_descendant(newsk
, oldsk
);
8107 /* Restore the ep value that was overwritten with the above structure
8113 /* Hook this new socket in to the bind_hash list. */
8114 head
= &sctp_port_hashtable
[sctp_phashfn(sock_net(oldsk
),
8115 inet_sk(oldsk
)->inet_num
)];
8116 spin_lock_bh(&head
->lock
);
8117 pp
= sctp_sk(oldsk
)->bind_hash
;
8118 sk_add_bind_node(newsk
, &pp
->owner
);
8119 sctp_sk(newsk
)->bind_hash
= pp
;
8120 inet_sk(newsk
)->inet_num
= inet_sk(oldsk
)->inet_num
;
8121 spin_unlock_bh(&head
->lock
);
8123 /* Copy the bind_addr list from the original endpoint to the new
8124 * endpoint so that we can handle restarts properly
8126 sctp_bind_addr_dup(&newsp
->ep
->base
.bind_addr
,
8127 &oldsp
->ep
->base
.bind_addr
, GFP_KERNEL
);
8129 /* Move any messages in the old socket's receive queue that are for the
8130 * peeled off association to the new socket's receive queue.
8132 sctp_skb_for_each(skb
, &oldsk
->sk_receive_queue
, tmp
) {
8133 event
= sctp_skb2event(skb
);
8134 if (event
->asoc
== assoc
) {
8135 __skb_unlink(skb
, &oldsk
->sk_receive_queue
);
8136 __skb_queue_tail(&newsk
->sk_receive_queue
, skb
);
8137 sctp_skb_set_owner_r_frag(skb
, newsk
);
8141 /* Clean up any messages pending delivery due to partial
8142 * delivery. Three cases:
8143 * 1) No partial deliver; no work.
8144 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
8145 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
8147 skb_queue_head_init(&newsp
->pd_lobby
);
8148 atomic_set(&sctp_sk(newsk
)->pd_mode
, assoc
->ulpq
.pd_mode
);
8150 if (atomic_read(&sctp_sk(oldsk
)->pd_mode
)) {
8151 struct sk_buff_head
*queue
;
8153 /* Decide which queue to move pd_lobby skbs to. */
8154 if (assoc
->ulpq
.pd_mode
) {
8155 queue
= &newsp
->pd_lobby
;
8157 queue
= &newsk
->sk_receive_queue
;
8159 /* Walk through the pd_lobby, looking for skbs that
8160 * need moved to the new socket.
8162 sctp_skb_for_each(skb
, &oldsp
->pd_lobby
, tmp
) {
8163 event
= sctp_skb2event(skb
);
8164 if (event
->asoc
== assoc
) {
8165 __skb_unlink(skb
, &oldsp
->pd_lobby
);
8166 __skb_queue_tail(queue
, skb
);
8167 sctp_skb_set_owner_r_frag(skb
, newsk
);
8171 /* Clear up any skbs waiting for the partial
8172 * delivery to finish.
8174 if (assoc
->ulpq
.pd_mode
)
8175 sctp_clear_pd(oldsk
, NULL
);
8179 sctp_skb_for_each(skb
, &assoc
->ulpq
.reasm
, tmp
)
8180 sctp_skb_set_owner_r_frag(skb
, newsk
);
8182 sctp_skb_for_each(skb
, &assoc
->ulpq
.lobby
, tmp
)
8183 sctp_skb_set_owner_r_frag(skb
, newsk
);
8185 /* Set the type of socket to indicate that it is peeled off from the
8186 * original UDP-style socket or created with the accept() call on a
8187 * TCP-style socket..
8191 /* Mark the new socket "in-use" by the user so that any packets
8192 * that may arrive on the association after we've moved it are
8193 * queued to the backlog. This prevents a potential race between
8194 * backlog processing on the old socket and new-packet processing
8195 * on the new socket.
8197 * The caller has just allocated newsk so we can guarantee that other
8198 * paths won't try to lock it and then oldsk.
8200 lock_sock_nested(newsk
, SINGLE_DEPTH_NESTING
);
8201 sctp_assoc_migrate(assoc
, newsk
);
8203 /* If the association on the newsk is already closed before accept()
8204 * is called, set RCV_SHUTDOWN flag.
8206 if (sctp_state(assoc
, CLOSED
) && sctp_style(newsk
, TCP
)) {
8207 newsk
->sk_state
= SCTP_SS_CLOSED
;
8208 newsk
->sk_shutdown
|= RCV_SHUTDOWN
;
8210 newsk
->sk_state
= SCTP_SS_ESTABLISHED
;
8213 release_sock(newsk
);
8217 /* This proto struct describes the ULP interface for SCTP. */
8218 struct proto sctp_prot
= {
8220 .owner
= THIS_MODULE
,
8221 .close
= sctp_close
,
8222 .connect
= sctp_connect
,
8223 .disconnect
= sctp_disconnect
,
8224 .accept
= sctp_accept
,
8225 .ioctl
= sctp_ioctl
,
8226 .init
= sctp_init_sock
,
8227 .destroy
= sctp_destroy_sock
,
8228 .shutdown
= sctp_shutdown
,
8229 .setsockopt
= sctp_setsockopt
,
8230 .getsockopt
= sctp_getsockopt
,
8231 .sendmsg
= sctp_sendmsg
,
8232 .recvmsg
= sctp_recvmsg
,
8234 .backlog_rcv
= sctp_backlog_rcv
,
8236 .unhash
= sctp_unhash
,
8237 .get_port
= sctp_get_port
,
8238 .obj_size
= sizeof(struct sctp_sock
),
8239 .sysctl_mem
= sysctl_sctp_mem
,
8240 .sysctl_rmem
= sysctl_sctp_rmem
,
8241 .sysctl_wmem
= sysctl_sctp_wmem
,
8242 .memory_pressure
= &sctp_memory_pressure
,
8243 .enter_memory_pressure
= sctp_enter_memory_pressure
,
8244 .memory_allocated
= &sctp_memory_allocated
,
8245 .sockets_allocated
= &sctp_sockets_allocated
,
8248 #if IS_ENABLED(CONFIG_IPV6)
8250 #include <net/transp_v6.h>
8251 static void sctp_v6_destroy_sock(struct sock
*sk
)
8253 sctp_destroy_sock(sk
);
8254 inet6_destroy_sock(sk
);
8257 struct proto sctpv6_prot
= {
8259 .owner
= THIS_MODULE
,
8260 .close
= sctp_close
,
8261 .connect
= sctp_connect
,
8262 .disconnect
= sctp_disconnect
,
8263 .accept
= sctp_accept
,
8264 .ioctl
= sctp_ioctl
,
8265 .init
= sctp_init_sock
,
8266 .destroy
= sctp_v6_destroy_sock
,
8267 .shutdown
= sctp_shutdown
,
8268 .setsockopt
= sctp_setsockopt
,
8269 .getsockopt
= sctp_getsockopt
,
8270 .sendmsg
= sctp_sendmsg
,
8271 .recvmsg
= sctp_recvmsg
,
8273 .backlog_rcv
= sctp_backlog_rcv
,
8275 .unhash
= sctp_unhash
,
8276 .get_port
= sctp_get_port
,
8277 .obj_size
= sizeof(struct sctp6_sock
),
8278 .sysctl_mem
= sysctl_sctp_mem
,
8279 .sysctl_rmem
= sysctl_sctp_rmem
,
8280 .sysctl_wmem
= sysctl_sctp_wmem
,
8281 .memory_pressure
= &sctp_memory_pressure
,
8282 .enter_memory_pressure
= sctp_enter_memory_pressure
,
8283 .memory_allocated
= &sctp_memory_allocated
,
8284 .sockets_allocated
= &sctp_sockets_allocated
,
8286 #endif /* IS_ENABLED(CONFIG_IPV6) */