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 Intel Corp.
6 *
7 * This file is part of the SCTP kernel implementation
8 *
9 * This SCTP implementation is free software;
10 * you can redistribute it and/or modify it under the terms of
11 * the GNU General Public License as published by
12 * the Free Software Foundation; either version 2, or (at your option)
13 * any later version.
14 *
15 * This SCTP implementation is distributed in the hope that it
16 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
17 * ************************
18 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
19 * See the GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with GNU CC; see the file COPYING. If not, see
23 * <http://www.gnu.org/licenses/>.
24 *
25 * Please send any bug reports or fixes you make to the
26 * email addresses:
27 * lksctp developers <linux-sctp@vger.kernel.org>
28 *
29 * Written or modified by:
30 * Randall Stewart <randall@sctp.chicago.il.us>
31 * Ken Morneau <kmorneau@cisco.com>
32 * Qiaobing Xie <qxie1@email.mot.com>
33 * La Monte H.P. Yarroll <piggy@acm.org>
34 * Karl Knutson <karl@athena.chicago.il.us>
35 * Jon Grimm <jgrimm@us.ibm.com>
36 * Xingang Guo <xingang.guo@intel.com>
37 * Hui Huang <hui.huang@nokia.com>
38 * Sridhar Samudrala <sri@us.ibm.com>
39 * Daisy Chang <daisyc@us.ibm.com>
40 * Dajiang Zhang <dajiang.zhang@nokia.com>
41 * Ardelle Fan <ardelle.fan@intel.com>
42 * Ryan Layer <rmlayer@us.ibm.com>
43 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
44 * Kevin Gao <kevin.gao@intel.com>
45 */
46
47 #ifndef __sctp_structs_h__
48 #define __sctp_structs_h__
49
50 #include <linux/ktime.h>
51 #include <linux/rhashtable.h>
52 #include <linux/socket.h> /* linux/in.h needs this!! */
53 #include <linux/in.h> /* We get struct sockaddr_in. */
54 #include <linux/in6.h> /* We get struct in6_addr */
55 #include <linux/ipv6.h>
56 #include <asm/param.h> /* We get MAXHOSTNAMELEN. */
57 #include <linux/atomic.h> /* This gets us atomic counters. */
58 #include <linux/skbuff.h> /* We need sk_buff_head. */
59 #include <linux/workqueue.h> /* We need tq_struct. */
60 #include <linux/sctp.h> /* We need sctp* header structs. */
61 #include <net/sctp/auth.h> /* We need auth specific structs */
62 #include <net/ip.h> /* For inet_skb_parm */
63
64 /* A convenience structure for handling sockaddr structures.
65 * We should wean ourselves off this.
66 */
67 union sctp_addr {
68 struct sockaddr_in v4;
69 struct sockaddr_in6 v6;
70 struct sockaddr sa;
71 };
72
73 /* Forward declarations for data structures. */
74 struct sctp_globals;
75 struct sctp_endpoint;
76 struct sctp_association;
77 struct sctp_transport;
78 struct sctp_packet;
79 struct sctp_chunk;
80 struct sctp_inq;
81 struct sctp_outq;
82 struct sctp_bind_addr;
83 struct sctp_ulpq;
84 struct sctp_ep_common;
85 struct sctp_ssnmap;
86 struct crypto_shash;
87
88
89 #include <net/sctp/tsnmap.h>
90 #include <net/sctp/ulpevent.h>
91 #include <net/sctp/ulpqueue.h>
92
93 /* Structures useful for managing bind/connect. */
94
95 struct sctp_bind_bucket {
96 unsigned short port;
97 unsigned short fastreuse;
98 struct hlist_node node;
99 struct hlist_head owner;
100 struct net *net;
101 };
102
103 struct sctp_bind_hashbucket {
104 spinlock_t lock;
105 struct hlist_head chain;
106 };
107
108 /* Used for hashing all associations. */
109 struct sctp_hashbucket {
110 rwlock_t lock;
111 struct hlist_head chain;
112 } __attribute__((__aligned__(8)));
113
114
115 /* The SCTP globals structure. */
116 extern struct sctp_globals {
117 /* This is a list of groups of functions for each address
118 * family that we support.
119 */
120 struct list_head address_families;
121
122 /* This is the hash of all endpoints. */
123 struct sctp_hashbucket *ep_hashtable;
124 /* This is the sctp port control hash. */
125 struct sctp_bind_hashbucket *port_hashtable;
126 /* This is the hash of all transports. */
127 struct rhashtable transport_hashtable;
128
129 /* Sizes of above hashtables. */
130 int ep_hashsize;
131 int port_hashsize;
132
133 /* Default initialization values to be applied to new associations. */
134 __u16 max_instreams;
135 __u16 max_outstreams;
136
137 /* Flag to indicate whether computing and verifying checksum
138 * is disabled. */
139 bool checksum_disable;
140 } sctp_globals;
141
142 #define sctp_max_instreams (sctp_globals.max_instreams)
143 #define sctp_max_outstreams (sctp_globals.max_outstreams)
144 #define sctp_address_families (sctp_globals.address_families)
145 #define sctp_ep_hashsize (sctp_globals.ep_hashsize)
146 #define sctp_ep_hashtable (sctp_globals.ep_hashtable)
147 #define sctp_port_hashsize (sctp_globals.port_hashsize)
148 #define sctp_port_hashtable (sctp_globals.port_hashtable)
149 #define sctp_transport_hashtable (sctp_globals.transport_hashtable)
150 #define sctp_checksum_disable (sctp_globals.checksum_disable)
151
152 /* SCTP Socket type: UDP or TCP style. */
153 typedef enum {
154 SCTP_SOCKET_UDP = 0,
155 SCTP_SOCKET_UDP_HIGH_BANDWIDTH,
156 SCTP_SOCKET_TCP
157 } sctp_socket_type_t;
158
159 /* Per socket SCTP information. */
160 struct sctp_sock {
161 /* inet_sock has to be the first member of sctp_sock */
162 struct inet_sock inet;
163 /* What kind of a socket is this? */
164 sctp_socket_type_t type;
165
166 /* PF_ family specific functions. */
167 struct sctp_pf *pf;
168
169 /* Access to HMAC transform. */
170 struct crypto_shash *hmac;
171 char *sctp_hmac_alg;
172
173 /* What is our base endpointer? */
174 struct sctp_endpoint *ep;
175
176 struct sctp_bind_bucket *bind_hash;
177 /* Various Socket Options. */
178 __u16 default_stream;
179 __u32 default_ppid;
180 __u16 default_flags;
181 __u32 default_context;
182 __u32 default_timetolive;
183 __u32 default_rcv_context;
184 int max_burst;
185
186 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
187 * the destination address every heartbeat interval. This value
188 * will be inherited by all new associations.
189 */
190 __u32 hbinterval;
191
192 /* This is the max_retrans value for new associations. */
193 __u16 pathmaxrxt;
194
195 /* The initial Path MTU to use for new associations. */
196 __u32 pathmtu;
197
198 /* The default SACK delay timeout for new associations. */
199 __u32 sackdelay;
200 __u32 sackfreq;
201
202 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
203 __u32 param_flags;
204
205 struct sctp_initmsg initmsg;
206 struct sctp_rtoinfo rtoinfo;
207 struct sctp_paddrparams paddrparam;
208 struct sctp_event_subscribe subscribe;
209 struct sctp_assocparams assocparams;
210
211 int user_frag;
212
213 __u32 autoclose;
214 __u32 adaptation_ind;
215 __u32 pd_point;
216 __u16 nodelay:1,
217 disable_fragments:1,
218 v4mapped:1,
219 frag_interleave:1,
220 recvrcvinfo:1,
221 recvnxtinfo:1,
222 data_ready_signalled:1;
223
224 atomic_t pd_mode;
225 /* Receive to here while partial delivery is in effect. */
226 struct sk_buff_head pd_lobby;
227
228 /* These must be the last fields, as they will skipped on copies,
229 * like on accept and peeloff operations
230 */
231 struct list_head auto_asconf_list;
232 int do_auto_asconf;
233 };
234
sctp_sk(const struct sock * sk)235 static inline struct sctp_sock *sctp_sk(const struct sock *sk)
236 {
237 return (struct sctp_sock *)sk;
238 }
239
sctp_opt2sk(const struct sctp_sock * sp)240 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp)
241 {
242 return (struct sock *)sp;
243 }
244
245 #if IS_ENABLED(CONFIG_IPV6)
246 struct sctp6_sock {
247 struct sctp_sock sctp;
248 struct ipv6_pinfo inet6;
249 };
250 #endif /* CONFIG_IPV6 */
251
252
253 /* This is our APPLICATION-SPECIFIC state cookie.
254 * THIS IS NOT DICTATED BY THE SPECIFICATION.
255 */
256 /* These are the parts of an association which we send in the cookie.
257 * Most of these are straight out of:
258 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB)
259 *
260 */
261
262 struct sctp_cookie {
263
264 /* My : Tag expected in every inbound packet and sent
265 * Verification: in the INIT or INIT ACK chunk.
266 * Tag :
267 */
268 __u32 my_vtag;
269
270 /* Peer's : Tag expected in every outbound packet except
271 * Verification: in the INIT chunk.
272 * Tag :
273 */
274 __u32 peer_vtag;
275
276 /* The rest of these are not from the spec, but really need to
277 * be in the cookie.
278 */
279
280 /* My Tie Tag : Assist in discovering a restarting association. */
281 __u32 my_ttag;
282
283 /* Peer's Tie Tag: Assist in discovering a restarting association. */
284 __u32 peer_ttag;
285
286 /* When does this cookie expire? */
287 ktime_t expiration;
288
289 /* Number of inbound/outbound streams which are set
290 * and negotiated during the INIT process.
291 */
292 __u16 sinit_num_ostreams;
293 __u16 sinit_max_instreams;
294
295 /* This is the first sequence number I used. */
296 __u32 initial_tsn;
297
298 /* This holds the originating address of the INIT packet. */
299 union sctp_addr peer_addr;
300
301 /* IG Section 2.35.3
302 * Include the source port of the INIT-ACK
303 */
304 __u16 my_port;
305
306 __u8 prsctp_capable;
307
308 /* Padding for future use */
309 __u8 padding;
310
311 __u32 adaptation_ind;
312
313 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH];
314 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2];
315 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS];
316
317 /* This is a shim for my peer's INIT packet, followed by
318 * a copy of the raw address list of the association.
319 * The length of the raw address list is saved in the
320 * raw_addr_list_len field, which will be used at the time when
321 * the association TCB is re-constructed from the cookie.
322 */
323 __u32 raw_addr_list_len;
324 struct sctp_init_chunk peer_init[0];
325 };
326
327
328 /* The format of our cookie that we send to our peer. */
329 struct sctp_signed_cookie {
330 __u8 signature[SCTP_SECRET_SIZE];
331 __u32 __pad; /* force sctp_cookie alignment to 64 bits */
332 struct sctp_cookie c;
333 } __packed;
334
335 /* This is another convenience type to allocate memory for address
336 * params for the maximum size and pass such structures around
337 * internally.
338 */
339 union sctp_addr_param {
340 struct sctp_paramhdr p;
341 struct sctp_ipv4addr_param v4;
342 struct sctp_ipv6addr_param v6;
343 };
344
345 /* A convenience type to allow walking through the various
346 * parameters and avoid casting all over the place.
347 */
348 union sctp_params {
349 void *v;
350 struct sctp_paramhdr *p;
351 struct sctp_cookie_preserve_param *life;
352 struct sctp_hostname_param *dns;
353 struct sctp_cookie_param *cookie;
354 struct sctp_supported_addrs_param *sat;
355 struct sctp_ipv4addr_param *v4;
356 struct sctp_ipv6addr_param *v6;
357 union sctp_addr_param *addr;
358 struct sctp_adaptation_ind_param *aind;
359 struct sctp_supported_ext_param *ext;
360 struct sctp_random_param *random;
361 struct sctp_chunks_param *chunks;
362 struct sctp_hmac_algo_param *hmac_algo;
363 struct sctp_addip_param *addip;
364 };
365
366 /* RFC 2960. Section 3.3.5 Heartbeat.
367 * Heartbeat Information: variable length
368 * The Sender-specific Heartbeat Info field should normally include
369 * information about the sender's current time when this HEARTBEAT
370 * chunk is sent and the destination transport address to which this
371 * HEARTBEAT is sent (see Section 8.3).
372 */
373 typedef struct sctp_sender_hb_info {
374 struct sctp_paramhdr param_hdr;
375 union sctp_addr daddr;
376 unsigned long sent_at;
377 __u64 hb_nonce;
378 } __packed sctp_sender_hb_info_t;
379
380 /*
381 * RFC 2960 1.3.2 Sequenced Delivery within Streams
382 *
383 * The term "stream" is used in SCTP to refer to a sequence of user
384 * messages that are to be delivered to the upper-layer protocol in
385 * order with respect to other messages within the same stream. This is
386 * in contrast to its usage in TCP, where it refers to a sequence of
387 * bytes (in this document a byte is assumed to be eight bits).
388 * ...
389 *
390 * This is the structure we use to track both our outbound and inbound
391 * SSN, or Stream Sequence Numbers.
392 */
393
394 struct sctp_stream {
395 __u16 *ssn;
396 unsigned int len;
397 };
398
399 struct sctp_ssnmap {
400 struct sctp_stream in;
401 struct sctp_stream out;
402 };
403
404 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out,
405 gfp_t gfp);
406 void sctp_ssnmap_free(struct sctp_ssnmap *map);
407 void sctp_ssnmap_clear(struct sctp_ssnmap *map);
408
409 /* What is the current SSN number for this stream? */
sctp_ssn_peek(struct sctp_stream * stream,__u16 id)410 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id)
411 {
412 return stream->ssn[id];
413 }
414
415 /* Return the next SSN number for this stream. */
sctp_ssn_next(struct sctp_stream * stream,__u16 id)416 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id)
417 {
418 return stream->ssn[id]++;
419 }
420
421 /* Skip over this ssn and all below. */
sctp_ssn_skip(struct sctp_stream * stream,__u16 id,__u16 ssn)422 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id,
423 __u16 ssn)
424 {
425 stream->ssn[id] = ssn+1;
426 }
427
428 /*
429 * Pointers to address related SCTP functions.
430 * (i.e. things that depend on the address family.)
431 */
432 struct sctp_af {
433 int (*sctp_xmit) (struct sk_buff *skb,
434 struct sctp_transport *);
435 int (*setsockopt) (struct sock *sk,
436 int level,
437 int optname,
438 char __user *optval,
439 unsigned int optlen);
440 int (*getsockopt) (struct sock *sk,
441 int level,
442 int optname,
443 char __user *optval,
444 int __user *optlen);
445 int (*compat_setsockopt) (struct sock *sk,
446 int level,
447 int optname,
448 char __user *optval,
449 unsigned int optlen);
450 int (*compat_getsockopt) (struct sock *sk,
451 int level,
452 int optname,
453 char __user *optval,
454 int __user *optlen);
455 void (*get_dst) (struct sctp_transport *t,
456 union sctp_addr *saddr,
457 struct flowi *fl,
458 struct sock *sk);
459 void (*get_saddr) (struct sctp_sock *sk,
460 struct sctp_transport *t,
461 struct flowi *fl);
462 void (*copy_addrlist) (struct list_head *,
463 struct net_device *);
464 int (*cmp_addr) (const union sctp_addr *addr1,
465 const union sctp_addr *addr2);
466 void (*addr_copy) (union sctp_addr *dst,
467 union sctp_addr *src);
468 void (*from_skb) (union sctp_addr *,
469 struct sk_buff *skb,
470 int saddr);
471 void (*from_sk) (union sctp_addr *,
472 struct sock *sk);
473 void (*from_addr_param) (union sctp_addr *,
474 union sctp_addr_param *,
475 __be16 port, int iif);
476 int (*to_addr_param) (const union sctp_addr *,
477 union sctp_addr_param *);
478 int (*addr_valid) (union sctp_addr *,
479 struct sctp_sock *,
480 const struct sk_buff *);
481 sctp_scope_t (*scope) (union sctp_addr *);
482 void (*inaddr_any) (union sctp_addr *, __be16);
483 int (*is_any) (const union sctp_addr *);
484 int (*available) (union sctp_addr *,
485 struct sctp_sock *);
486 int (*skb_iif) (const struct sk_buff *sk);
487 int (*is_ce) (const struct sk_buff *sk);
488 void (*seq_dump_addr)(struct seq_file *seq,
489 union sctp_addr *addr);
490 void (*ecn_capable)(struct sock *sk);
491 __u16 net_header_len;
492 int sockaddr_len;
493 sa_family_t sa_family;
494 struct list_head list;
495 };
496
497 struct sctp_af *sctp_get_af_specific(sa_family_t);
498 int sctp_register_af(struct sctp_af *);
499
500 /* Protocol family functions. */
501 struct sctp_pf {
502 void (*event_msgname)(struct sctp_ulpevent *, char *, int *);
503 void (*skb_msgname) (struct sk_buff *, char *, int *);
504 int (*af_supported) (sa_family_t, struct sctp_sock *);
505 int (*cmp_addr) (const union sctp_addr *,
506 const union sctp_addr *,
507 struct sctp_sock *);
508 int (*bind_verify) (struct sctp_sock *, union sctp_addr *);
509 int (*send_verify) (struct sctp_sock *, union sctp_addr *);
510 int (*supported_addrs)(const struct sctp_sock *, __be16 *);
511 struct sock *(*create_accept_sk) (struct sock *sk,
512 struct sctp_association *asoc);
513 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr);
514 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk);
515 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk);
516 struct sctp_af *af;
517 };
518
519
520 /* Structure to track chunk fragments that have been acked, but peer
521 * fragments of the same message have not.
522 */
523 struct sctp_datamsg {
524 /* Chunks waiting to be submitted to lower layer. */
525 struct list_head chunks;
526 /* Reference counting. */
527 atomic_t refcnt;
528 /* When is this message no longer interesting to the peer? */
529 unsigned long expires_at;
530 /* Did the messenge fail to send? */
531 int send_error;
532 u8 send_failed:1,
533 can_abandon:1, /* can chunks from this message can be abandoned. */
534 can_delay; /* should this message be Nagle delayed */
535 };
536
537 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *,
538 struct sctp_sndrcvinfo *,
539 struct iov_iter *);
540 void sctp_datamsg_free(struct sctp_datamsg *);
541 void sctp_datamsg_put(struct sctp_datamsg *);
542 void sctp_chunk_fail(struct sctp_chunk *, int error);
543 int sctp_chunk_abandoned(struct sctp_chunk *);
544
545 /* RFC2960 1.4 Key Terms
546 *
547 * o Chunk: A unit of information within an SCTP packet, consisting of
548 * a chunk header and chunk-specific content.
549 *
550 * As a matter of convenience, we remember the SCTP common header for
551 * each chunk as well as a few other header pointers...
552 */
553 struct sctp_chunk {
554 struct list_head list;
555
556 atomic_t refcnt;
557
558 /* How many times this chunk have been sent, for prsctp RTX policy */
559 int sent_count;
560
561 /* This is our link to the per-transport transmitted list. */
562 struct list_head transmitted_list;
563
564 /* This field is used by chunks that hold fragmented data.
565 * For the first fragment this is the list that holds the rest of
566 * fragments. For the remaining fragments, this is the link to the
567 * frag_list maintained in the first fragment.
568 */
569 struct list_head frag_list;
570
571 /* This points to the sk_buff containing the actual data. */
572 struct sk_buff *skb;
573
574 /* In case of GSO packets, this will store the head one */
575 struct sk_buff *head_skb;
576
577 /* These are the SCTP headers by reverse order in a packet.
578 * Note that some of these may happen more than once. In that
579 * case, we point at the "current" one, whatever that means
580 * for that level of header.
581 */
582
583 /* We point this at the FIRST TLV parameter to chunk_hdr. */
584 union sctp_params param_hdr;
585 union {
586 __u8 *v;
587 struct sctp_datahdr *data_hdr;
588 struct sctp_inithdr *init_hdr;
589 struct sctp_sackhdr *sack_hdr;
590 struct sctp_heartbeathdr *hb_hdr;
591 struct sctp_sender_hb_info *hbs_hdr;
592 struct sctp_shutdownhdr *shutdown_hdr;
593 struct sctp_signed_cookie *cookie_hdr;
594 struct sctp_ecnehdr *ecne_hdr;
595 struct sctp_cwrhdr *ecn_cwr_hdr;
596 struct sctp_errhdr *err_hdr;
597 struct sctp_addiphdr *addip_hdr;
598 struct sctp_fwdtsn_hdr *fwdtsn_hdr;
599 struct sctp_authhdr *auth_hdr;
600 } subh;
601
602 __u8 *chunk_end;
603
604 struct sctp_chunkhdr *chunk_hdr;
605 struct sctphdr *sctp_hdr;
606
607 /* This needs to be recoverable for SCTP_SEND_FAILED events. */
608 struct sctp_sndrcvinfo sinfo;
609
610 /* Which association does this belong to? */
611 struct sctp_association *asoc;
612
613 /* What endpoint received this chunk? */
614 struct sctp_ep_common *rcvr;
615
616 /* We fill this in if we are calculating RTT. */
617 unsigned long sent_at;
618
619 /* What is the origin IP address for this chunk? */
620 union sctp_addr source;
621 /* Destination address for this chunk. */
622 union sctp_addr dest;
623
624 /* For outbound message, track all fragments for SEND_FAILED. */
625 struct sctp_datamsg *msg;
626
627 /* For an inbound chunk, this tells us where it came from.
628 * For an outbound chunk, it tells us where we'd like it to
629 * go. It is NULL if we have no preference.
630 */
631 struct sctp_transport *transport;
632
633 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO
634 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH
635 * spec violates the principle premis that all chunks are processed
636 * in order.
637 */
638 struct sk_buff *auth_chunk;
639
640 #define SCTP_CAN_FRTX 0x0
641 #define SCTP_NEED_FRTX 0x1
642 #define SCTP_DONT_FRTX 0x2
643 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */
644 resent:1, /* Has this chunk ever been resent. */
645 has_tsn:1, /* Does this chunk have a TSN yet? */
646 has_ssn:1, /* Does this chunk have a SSN yet? */
647 singleton:1, /* Only chunk in the packet? */
648 end_of_packet:1, /* Last chunk in the packet? */
649 ecn_ce_done:1, /* Have we processed the ECN CE bit? */
650 pdiscard:1, /* Discard the whole packet now? */
651 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */
652 data_accepted:1, /* At least 1 chunk accepted */
653 auth:1, /* IN: was auth'ed | OUT: needs auth */
654 has_asconf:1, /* IN: have seen an asconf before */
655 tsn_missing_report:2, /* Data chunk missing counter. */
656 fast_retransmit:2; /* Is this chunk fast retransmitted? */
657 };
658
659 void sctp_chunk_hold(struct sctp_chunk *);
660 void sctp_chunk_put(struct sctp_chunk *);
661 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
662 struct iov_iter *from);
663 void sctp_chunk_free(struct sctp_chunk *);
664 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data);
665 struct sctp_chunk *sctp_chunkify(struct sk_buff *,
666 const struct sctp_association *,
667 struct sock *, gfp_t gfp);
668 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *,
669 union sctp_addr *);
670 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk);
671
672 enum {
673 SCTP_ADDR_NEW, /* new address added to assoc/ep */
674 SCTP_ADDR_SRC, /* address can be used as source */
675 SCTP_ADDR_DEL, /* address about to be deleted */
676 };
677
678 /* This is a structure for holding either an IPv6 or an IPv4 address. */
679 struct sctp_sockaddr_entry {
680 struct list_head list;
681 struct rcu_head rcu;
682 union sctp_addr a;
683 __u8 state;
684 __u8 valid;
685 };
686
687 #define SCTP_ADDRESS_TICK_DELAY 500
688
689 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *);
690
691 /* This structure holds lists of chunks as we are assembling for
692 * transmission.
693 */
694 struct sctp_packet {
695 /* These are the SCTP header values (host order) for the packet. */
696 __u16 source_port;
697 __u16 destination_port;
698 __u32 vtag;
699
700 /* This contains the payload chunks. */
701 struct list_head chunk_list;
702
703 /* This is the overhead of the sctp and ip headers. */
704 size_t overhead;
705 /* This is the total size of all chunks INCLUDING padding. */
706 size_t size;
707 /* This is the maximum size this packet may have */
708 size_t max_size;
709
710 /* The packet is destined for this transport address.
711 * The function we finally use to pass down to the next lower
712 * layer lives in the transport structure.
713 */
714 struct sctp_transport *transport;
715
716 /* pointer to the auth chunk for this packet */
717 struct sctp_chunk *auth;
718
719 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */
720 has_sack:1, /* This packet contains a SACK chunk. */
721 has_auth:1, /* This packet contains an AUTH chunk */
722 has_data:1, /* This packet contains at least 1 DATA chunk */
723 ipfragok:1; /* So let ip fragment this packet */
724 };
725
726 struct sctp_packet *sctp_packet_init(struct sctp_packet *,
727 struct sctp_transport *,
728 __u16 sport, __u16 dport);
729 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int);
730 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *,
731 struct sctp_chunk *, int, gfp_t);
732 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *,
733 struct sctp_chunk *);
734 int sctp_packet_transmit(struct sctp_packet *, gfp_t);
735 void sctp_packet_free(struct sctp_packet *);
736
sctp_packet_empty(struct sctp_packet * packet)737 static inline int sctp_packet_empty(struct sctp_packet *packet)
738 {
739 return packet->size == packet->overhead;
740 }
741
742 /* This represents a remote transport address.
743 * For local transport addresses, we just use union sctp_addr.
744 *
745 * RFC2960 Section 1.4 Key Terms
746 *
747 * o Transport address: A Transport Address is traditionally defined
748 * by Network Layer address, Transport Layer protocol and Transport
749 * Layer port number. In the case of SCTP running over IP, a
750 * transport address is defined by the combination of an IP address
751 * and an SCTP port number (where SCTP is the Transport protocol).
752 *
753 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control
754 *
755 * o The sender keeps a separate congestion control parameter set for
756 * each of the destination addresses it can send to (not each
757 * source-destination pair but for each destination). The parameters
758 * should decay if the address is not used for a long enough time
759 * period.
760 *
761 */
762 struct sctp_transport {
763 /* A list of transports. */
764 struct list_head transports;
765 struct rhash_head node;
766
767 /* Reference counting. */
768 atomic_t refcnt;
769 /* RTO-Pending : A flag used to track if one of the DATA
770 * chunks sent to this address is currently being
771 * used to compute a RTT. If this flag is 0,
772 * the next DATA chunk sent to this destination
773 * should be used to compute a RTT and this flag
774 * should be set. Every time the RTT
775 * calculation completes (i.e. the DATA chunk
776 * is SACK'd) clear this flag.
777 */
778 __u32 rto_pending:1,
779
780 /*
781 * hb_sent : a flag that signals that we have a pending
782 * heartbeat.
783 */
784 hb_sent:1,
785
786 /* Is the Path MTU update pending on this tranport */
787 pmtu_pending:1,
788
789 /* Has this transport moved the ctsn since we last sacked */
790 sack_generation:1;
791 u32 dst_cookie;
792
793 struct flowi fl;
794
795 /* This is the peer's IP address and port. */
796 union sctp_addr ipaddr;
797
798 /* These are the functions we call to handle LLP stuff. */
799 struct sctp_af *af_specific;
800
801 /* Which association do we belong to? */
802 struct sctp_association *asoc;
803
804 /* RFC2960
805 *
806 * 12.3 Per Transport Address Data
807 *
808 * For each destination transport address in the peer's
809 * address list derived from the INIT or INIT ACK chunk, a
810 * number of data elements needs to be maintained including:
811 */
812 /* RTO : The current retransmission timeout value. */
813 unsigned long rto;
814
815 __u32 rtt; /* This is the most recent RTT. */
816
817 /* RTTVAR : The current RTT variation. */
818 __u32 rttvar;
819
820 /* SRTT : The current smoothed round trip time. */
821 __u32 srtt;
822
823 /*
824 * These are the congestion stats.
825 */
826 /* cwnd : The current congestion window. */
827 __u32 cwnd; /* This is the actual cwnd. */
828
829 /* ssthresh : The current slow start threshold value. */
830 __u32 ssthresh;
831
832 /* partial : The tracking method for increase of cwnd when in
833 * bytes acked : congestion avoidance mode (see Section 6.2.2)
834 */
835 __u32 partial_bytes_acked;
836
837 /* Data that has been sent, but not acknowledged. */
838 __u32 flight_size;
839
840 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */
841
842 /* Destination */
843 struct dst_entry *dst;
844 /* Source address. */
845 union sctp_addr saddr;
846
847 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
848 * the destination address every heartbeat interval.
849 */
850 unsigned long hbinterval;
851
852 /* SACK delay timeout */
853 unsigned long sackdelay;
854 __u32 sackfreq;
855
856 /* When was the last time that we heard from this transport? We use
857 * this to pick new active and retran paths.
858 */
859 ktime_t last_time_heard;
860
861 /* When was the last time that we sent a chunk using this
862 * transport? We use this to check for idle transports
863 */
864 unsigned long last_time_sent;
865
866 /* Last time(in jiffies) when cwnd is reduced due to the congestion
867 * indication based on ECNE chunk.
868 */
869 unsigned long last_time_ecne_reduced;
870
871 /* This is the max_retrans value for the transport and will
872 * be initialized from the assocs value. This can be changed
873 * using the SCTP_SET_PEER_ADDR_PARAMS socket option.
874 */
875 __u16 pathmaxrxt;
876
877 /* This is the partially failed retrans value for the transport
878 * and will be initialized from the assocs value. This can be changed
879 * using the SCTP_PEER_ADDR_THLDS socket option
880 */
881 int pf_retrans;
882 /* PMTU : The current known path MTU. */
883 __u32 pathmtu;
884
885 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
886 __u32 param_flags;
887
888 /* The number of times INIT has been sent on this transport. */
889 int init_sent_count;
890
891 /* state : The current state of this destination,
892 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN.
893 */
894 int state;
895
896 /* These are the error stats for this destination. */
897
898 /* Error count : The current error count for this destination. */
899 unsigned short error_count;
900
901 /* Per : A timer used by each destination.
902 * Destination :
903 * Timer :
904 *
905 * [Everywhere else in the text this is called T3-rtx. -ed]
906 */
907 struct timer_list T3_rtx_timer;
908
909 /* Heartbeat timer is per destination. */
910 struct timer_list hb_timer;
911
912 /* Timer to handle ICMP proto unreachable envets */
913 struct timer_list proto_unreach_timer;
914
915 /* Since we're using per-destination retransmission timers
916 * (see above), we're also using per-destination "transmitted"
917 * queues. This probably ought to be a private struct
918 * accessible only within the outqueue, but it's not, yet.
919 */
920 struct list_head transmitted;
921
922 /* We build bundle-able packets for this transport here. */
923 struct sctp_packet packet;
924
925 /* This is the list of transports that have chunks to send. */
926 struct list_head send_ready;
927
928 /* State information saved for SFR_CACC algorithm. The key
929 * idea in SFR_CACC is to maintain state at the sender on a
930 * per-destination basis when a changeover happens.
931 * char changeover_active;
932 * char cycling_changeover;
933 * __u32 next_tsn_at_change;
934 * char cacc_saw_newack;
935 */
936 struct {
937 /* An unsigned integer, which stores the next TSN to be
938 * used by the sender, at the moment of changeover.
939 */
940 __u32 next_tsn_at_change;
941
942 /* A flag which indicates the occurrence of a changeover */
943 char changeover_active;
944
945 /* A flag which indicates whether the change of primary is
946 * the first switch to this destination address during an
947 * active switch.
948 */
949 char cycling_changeover;
950
951 /* A temporary flag, which is used during the processing of
952 * a SACK to estimate the causative TSN(s)'s group.
953 */
954 char cacc_saw_newack;
955 } cacc;
956
957 /* 64-bit random number sent with heartbeat. */
958 __u64 hb_nonce;
959
960 struct rcu_head rcu;
961 };
962
963 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *,
964 gfp_t);
965 void sctp_transport_set_owner(struct sctp_transport *,
966 struct sctp_association *);
967 void sctp_transport_route(struct sctp_transport *, union sctp_addr *,
968 struct sctp_sock *);
969 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk);
970 void sctp_transport_free(struct sctp_transport *);
971 void sctp_transport_reset_t3_rtx(struct sctp_transport *);
972 void sctp_transport_reset_hb_timer(struct sctp_transport *);
973 int sctp_transport_hold(struct sctp_transport *);
974 void sctp_transport_put(struct sctp_transport *);
975 void sctp_transport_update_rto(struct sctp_transport *, __u32);
976 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32);
977 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t);
978 void sctp_transport_burst_limited(struct sctp_transport *);
979 void sctp_transport_burst_reset(struct sctp_transport *);
980 unsigned long sctp_transport_timeout(struct sctp_transport *);
981 void sctp_transport_reset(struct sctp_transport *);
982 void sctp_transport_update_pmtu(struct sock *, struct sctp_transport *, u32);
983 void sctp_transport_immediate_rtx(struct sctp_transport *);
984
985
986 /* This is the structure we use to queue packets as they come into
987 * SCTP. We write packets to it and read chunks from it.
988 */
989 struct sctp_inq {
990 /* This is actually a queue of sctp_chunk each
991 * containing a partially decoded packet.
992 */
993 struct list_head in_chunk_list;
994 /* This is the packet which is currently off the in queue and is
995 * being worked on through the inbound chunk processing.
996 */
997 struct sctp_chunk *in_progress;
998
999 /* This is the delayed task to finish delivering inbound
1000 * messages.
1001 */
1002 struct work_struct immediate;
1003 };
1004
1005 void sctp_inq_init(struct sctp_inq *);
1006 void sctp_inq_free(struct sctp_inq *);
1007 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet);
1008 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *);
1009 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *);
1010 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t);
1011
1012 /* This is the structure we use to hold outbound chunks. You push
1013 * chunks in and they automatically pop out the other end as bundled
1014 * packets (it calls (*output_handler)()).
1015 *
1016 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1,
1017 * and 8.2 of the v13 draft.
1018 *
1019 * It handles retransmissions. The connection to the timeout portion
1020 * of the state machine is through sctp_..._timeout() and timeout_handler.
1021 *
1022 * If you feed it SACKs, it will eat them.
1023 *
1024 * If you give it big chunks, it will fragment them.
1025 *
1026 * It assigns TSN's to data chunks. This happens at the last possible
1027 * instant before transmission.
1028 *
1029 * When free()'d, it empties itself out via output_handler().
1030 */
1031 struct sctp_outq {
1032 struct sctp_association *asoc;
1033
1034 /* Data pending that has never been transmitted. */
1035 struct list_head out_chunk_list;
1036
1037 unsigned int out_qlen; /* Total length of queued data chunks. */
1038
1039 /* Error of send failed, may used in SCTP_SEND_FAILED event. */
1040 unsigned int error;
1041
1042 /* These are control chunks we want to send. */
1043 struct list_head control_chunk_list;
1044
1045 /* These are chunks that have been sacked but are above the
1046 * CTSN, or cumulative tsn ack point.
1047 */
1048 struct list_head sacked;
1049
1050 /* Put chunks on this list to schedule them for
1051 * retransmission.
1052 */
1053 struct list_head retransmit;
1054
1055 /* Put chunks on this list to save them for FWD TSN processing as
1056 * they were abandoned.
1057 */
1058 struct list_head abandoned;
1059
1060 /* How many unackd bytes do we have in-flight? */
1061 __u32 outstanding_bytes;
1062
1063 /* Are we doing fast-rtx on this queue */
1064 char fast_rtx;
1065
1066 /* Corked? */
1067 char cork;
1068 };
1069
1070 void sctp_outq_init(struct sctp_association *, struct sctp_outq *);
1071 void sctp_outq_teardown(struct sctp_outq *);
1072 void sctp_outq_free(struct sctp_outq*);
1073 void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t);
1074 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *);
1075 int sctp_outq_is_empty(const struct sctp_outq *);
1076 void sctp_outq_restart(struct sctp_outq *);
1077
1078 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *,
1079 sctp_retransmit_reason_t);
1080 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8);
1081 void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp);
1082 void sctp_prsctp_prune(struct sctp_association *asoc,
1083 struct sctp_sndrcvinfo *sinfo, int msg_len);
1084 /* Uncork and flush an outqueue. */
sctp_outq_cork(struct sctp_outq * q)1085 static inline void sctp_outq_cork(struct sctp_outq *q)
1086 {
1087 q->cork = 1;
1088 }
1089
1090 /* SCTP skb control block.
1091 * sctp_input_cb is currently used on rx and sock rx queue
1092 */
1093 struct sctp_input_cb {
1094 union {
1095 struct inet_skb_parm h4;
1096 #if IS_ENABLED(CONFIG_IPV6)
1097 struct inet6_skb_parm h6;
1098 #endif
1099 } header;
1100 struct sctp_chunk *chunk;
1101 struct sctp_af *af;
1102 };
1103 #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0]))
1104
sctp_gso_headskb(const struct sk_buff * skb)1105 static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb)
1106 {
1107 const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk;
1108
1109 return chunk->head_skb ? : skb;
1110 }
1111
1112 /* These bind address data fields common between endpoints and associations */
1113 struct sctp_bind_addr {
1114
1115 /* RFC 2960 12.1 Parameters necessary for the SCTP instance
1116 *
1117 * SCTP Port: The local SCTP port number the endpoint is
1118 * bound to.
1119 */
1120 __u16 port;
1121
1122 /* RFC 2960 12.1 Parameters necessary for the SCTP instance
1123 *
1124 * Address List: The list of IP addresses that this instance
1125 * has bound. This information is passed to one's
1126 * peer(s) in INIT and INIT ACK chunks.
1127 */
1128 struct list_head address_list;
1129 };
1130
1131 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port);
1132 void sctp_bind_addr_free(struct sctp_bind_addr *);
1133 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest,
1134 const struct sctp_bind_addr *src,
1135 sctp_scope_t scope, gfp_t gfp,
1136 int flags);
1137 int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
1138 const struct sctp_bind_addr *src,
1139 gfp_t gfp);
1140 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *,
1141 int new_size, __u8 addr_state, gfp_t gfp);
1142 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *);
1143 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *,
1144 struct sctp_sock *);
1145 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *,
1146 struct sctp_sock *, struct sctp_sock *);
1147 int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
1148 const union sctp_addr *addr);
1149 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
1150 const union sctp_addr *addrs,
1151 int addrcnt,
1152 struct sctp_sock *opt);
1153 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
1154 int *addrs_len,
1155 gfp_t gfp);
1156 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len,
1157 __u16 port, gfp_t gfp);
1158
1159 sctp_scope_t sctp_scope(const union sctp_addr *);
1160 int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope);
1161 int sctp_is_any(struct sock *sk, const union sctp_addr *addr);
1162 int sctp_is_ep_boundall(struct sock *sk);
1163
1164
1165 /* What type of endpoint? */
1166 typedef enum {
1167 SCTP_EP_TYPE_SOCKET,
1168 SCTP_EP_TYPE_ASSOCIATION,
1169 } sctp_endpoint_type_t;
1170
1171 /*
1172 * A common base class to bridge the implmentation view of a
1173 * socket (usually listening) endpoint versus an association's
1174 * local endpoint.
1175 * This common structure is useful for several purposes:
1176 * 1) Common interface for lookup routines.
1177 * a) Subfunctions work for either endpoint or association
1178 * b) Single interface to lookup allows hiding the lookup lock rather
1179 * than acquiring it externally.
1180 * 2) Common interface for the inbound chunk handling/state machine.
1181 * 3) Common object handling routines for reference counting, etc.
1182 * 4) Disentangle association lookup from endpoint lookup, where we
1183 * do not have to find our endpoint to find our association.
1184 *
1185 */
1186
1187 struct sctp_ep_common {
1188 /* Fields to help us manage our entries in the hash tables. */
1189 struct hlist_node node;
1190 int hashent;
1191
1192 /* Runtime type information. What kind of endpoint is this? */
1193 sctp_endpoint_type_t type;
1194
1195 /* Some fields to help us manage this object.
1196 * refcnt - Reference count access to this object.
1197 * dead - Do not attempt to use this object.
1198 */
1199 atomic_t refcnt;
1200 bool dead;
1201
1202 /* What socket does this endpoint belong to? */
1203 struct sock *sk;
1204
1205 /* This is where we receive inbound chunks. */
1206 struct sctp_inq inqueue;
1207
1208 /* This substructure includes the defining parameters of the
1209 * endpoint:
1210 * bind_addr.port is our shared port number.
1211 * bind_addr.address_list is our set of local IP addresses.
1212 */
1213 struct sctp_bind_addr bind_addr;
1214 };
1215
1216
1217 /* RFC Section 1.4 Key Terms
1218 *
1219 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a
1220 * multi-homed host, an SCTP endpoint is represented to its peers as a
1221 * combination of a set of eligible destination transport addresses to
1222 * which SCTP packets can be sent and a set of eligible source
1223 * transport addresses from which SCTP packets can be received.
1224 * All transport addresses used by an SCTP endpoint must use the
1225 * same port number, but can use multiple IP addresses. A transport
1226 * address used by an SCTP endpoint must not be used by another
1227 * SCTP endpoint. In other words, a transport address is unique
1228 * to an SCTP endpoint.
1229 *
1230 * From an implementation perspective, each socket has one of these.
1231 * A TCP-style socket will have exactly one association on one of
1232 * these. An UDP-style socket will have multiple associations hanging
1233 * off one of these.
1234 */
1235
1236 struct sctp_endpoint {
1237 /* Common substructure for endpoint and association. */
1238 struct sctp_ep_common base;
1239
1240 /* Associations: A list of current associations and mappings
1241 * to the data consumers for each association. This
1242 * may be in the form of a hash table or other
1243 * implementation dependent structure. The data
1244 * consumers may be process identification
1245 * information such as file descriptors, named pipe
1246 * pointer, or table pointers dependent on how SCTP
1247 * is implemented.
1248 */
1249 /* This is really a list of struct sctp_association entries. */
1250 struct list_head asocs;
1251
1252 /* Secret Key: A secret key used by this endpoint to compute
1253 * the MAC. This SHOULD be a cryptographic quality
1254 * random number with a sufficient length.
1255 * Discussion in [RFC1750] can be helpful in
1256 * selection of the key.
1257 */
1258 __u8 secret_key[SCTP_SECRET_SIZE];
1259
1260 /* digest: This is a digest of the sctp cookie. This field is
1261 * only used on the receive path when we try to validate
1262 * that the cookie has not been tampered with. We put
1263 * this here so we pre-allocate this once and can re-use
1264 * on every receive.
1265 */
1266 __u8 *digest;
1267
1268 /* sendbuf acct. policy. */
1269 __u32 sndbuf_policy;
1270
1271 /* rcvbuf acct. policy. */
1272 __u32 rcvbuf_policy;
1273
1274 /* SCTP AUTH: array of the HMACs that will be allocated
1275 * we need this per association so that we don't serialize
1276 */
1277 struct crypto_shash **auth_hmacs;
1278
1279 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */
1280 struct sctp_hmac_algo_param *auth_hmacs_list;
1281
1282 /* SCTP-AUTH: chunks to authenticate encoded into parameter */
1283 struct sctp_chunks_param *auth_chunk_list;
1284
1285 /* SCTP-AUTH: endpoint shared keys */
1286 struct list_head endpoint_shared_keys;
1287 __u16 active_key_id;
1288 __u8 auth_enable:1,
1289 prsctp_enable:1;
1290 };
1291
1292 /* Recover the outter endpoint structure. */
sctp_ep(struct sctp_ep_common * base)1293 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base)
1294 {
1295 struct sctp_endpoint *ep;
1296
1297 ep = container_of(base, struct sctp_endpoint, base);
1298 return ep;
1299 }
1300
1301 /* These are function signatures for manipulating endpoints. */
1302 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t);
1303 void sctp_endpoint_free(struct sctp_endpoint *);
1304 void sctp_endpoint_put(struct sctp_endpoint *);
1305 void sctp_endpoint_hold(struct sctp_endpoint *);
1306 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *);
1307 struct sctp_association *sctp_endpoint_lookup_assoc(
1308 const struct sctp_endpoint *ep,
1309 const union sctp_addr *paddr,
1310 struct sctp_transport **);
1311 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *,
1312 const union sctp_addr *);
1313 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *,
1314 struct net *, const union sctp_addr *);
1315 int sctp_has_association(struct net *net, const union sctp_addr *laddr,
1316 const union sctp_addr *paddr);
1317
1318 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
1319 const struct sctp_association *asoc,
1320 sctp_cid_t, sctp_init_chunk_t *peer_init,
1321 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk);
1322 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk,
1323 const union sctp_addr *peer,
1324 sctp_init_chunk_t *init, gfp_t gfp);
1325 __u32 sctp_generate_tag(const struct sctp_endpoint *);
1326 __u32 sctp_generate_tsn(const struct sctp_endpoint *);
1327
1328 struct sctp_inithdr_host {
1329 __u32 init_tag;
1330 __u32 a_rwnd;
1331 __u16 num_outbound_streams;
1332 __u16 num_inbound_streams;
1333 __u32 initial_tsn;
1334 };
1335
1336 /* SCTP_GET_ASSOC_STATS counters */
1337 struct sctp_priv_assoc_stats {
1338 /* Maximum observed rto in the association during subsequent
1339 * observations. Value is set to 0 if no RTO measurement took place
1340 * The transport where the max_rto was observed is returned in
1341 * obs_rto_ipaddr
1342 */
1343 struct sockaddr_storage obs_rto_ipaddr;
1344 __u64 max_obs_rto;
1345 /* Total In and Out SACKs received and sent */
1346 __u64 isacks;
1347 __u64 osacks;
1348 /* Total In and Out packets received and sent */
1349 __u64 opackets;
1350 __u64 ipackets;
1351 /* Total retransmitted chunks */
1352 __u64 rtxchunks;
1353 /* TSN received > next expected */
1354 __u64 outofseqtsns;
1355 /* Duplicate Chunks received */
1356 __u64 idupchunks;
1357 /* Gap Ack Blocks received */
1358 __u64 gapcnt;
1359 /* Unordered data chunks sent and received */
1360 __u64 ouodchunks;
1361 __u64 iuodchunks;
1362 /* Ordered data chunks sent and received */
1363 __u64 oodchunks;
1364 __u64 iodchunks;
1365 /* Control chunks sent and received */
1366 __u64 octrlchunks;
1367 __u64 ictrlchunks;
1368 };
1369
1370 /* RFC2960
1371 *
1372 * 12. Recommended Transmission Control Block (TCB) Parameters
1373 *
1374 * This section details a recommended set of parameters that should
1375 * be contained within the TCB for an implementation. This section is
1376 * for illustrative purposes and should not be deemed as requirements
1377 * on an implementation or as an exhaustive list of all parameters
1378 * inside an SCTP TCB. Each implementation may need its own additional
1379 * parameters for optimization.
1380 */
1381
1382
1383 /* Here we have information about each individual association. */
1384 struct sctp_association {
1385
1386 /* A base structure common to endpoint and association.
1387 * In this context, it represents the associations's view
1388 * of the local endpoint of the association.
1389 */
1390 struct sctp_ep_common base;
1391
1392 /* Associations on the same socket. */
1393 struct list_head asocs;
1394
1395 /* association id. */
1396 sctp_assoc_t assoc_id;
1397
1398 /* This is our parent endpoint. */
1399 struct sctp_endpoint *ep;
1400
1401 /* These are those association elements needed in the cookie. */
1402 struct sctp_cookie c;
1403
1404 /* This is all information about our peer. */
1405 struct {
1406 /* transport_addr_list
1407 *
1408 * Peer : A list of SCTP transport addresses that the
1409 * Transport : peer is bound to. This information is derived
1410 * Address : from the INIT or INIT ACK and is used to
1411 * List : associate an inbound packet with a given
1412 * : association. Normally this information is
1413 * : hashed or keyed for quick lookup and access
1414 * : of the TCB.
1415 * : The list is also initialized with the list
1416 * : of addresses passed with the sctp_connectx()
1417 * : call.
1418 *
1419 * It is a list of SCTP_transport's.
1420 */
1421 struct list_head transport_addr_list;
1422
1423 /* rwnd
1424 *
1425 * Peer Rwnd : Current calculated value of the peer's rwnd.
1426 */
1427 __u32 rwnd;
1428
1429 /* transport_count
1430 *
1431 * Peer : A count of the number of peer addresses
1432 * Transport : in the Peer Transport Address List.
1433 * Address :
1434 * Count :
1435 */
1436 __u16 transport_count;
1437
1438 /* port
1439 * The transport layer port number.
1440 */
1441 __u16 port;
1442
1443 /* primary_path
1444 *
1445 * Primary : This is the current primary destination
1446 * Path : transport address of the peer endpoint. It
1447 * : may also specify a source transport address
1448 * : on this endpoint.
1449 *
1450 * All of these paths live on transport_addr_list.
1451 *
1452 * At the bakeoffs, we discovered that the intent of
1453 * primaryPath is that it only changes when the ULP
1454 * asks to have it changed. We add the activePath to
1455 * designate the connection we are currently using to
1456 * transmit new data and most control chunks.
1457 */
1458 struct sctp_transport *primary_path;
1459
1460 /* Cache the primary path address here, when we
1461 * need a an address for msg_name.
1462 */
1463 union sctp_addr primary_addr;
1464
1465 /* active_path
1466 * The path that we are currently using to
1467 * transmit new data and most control chunks.
1468 */
1469 struct sctp_transport *active_path;
1470
1471 /* retran_path
1472 *
1473 * RFC2960 6.4 Multi-homed SCTP Endpoints
1474 * ...
1475 * Furthermore, when its peer is multi-homed, an
1476 * endpoint SHOULD try to retransmit a chunk to an
1477 * active destination transport address that is
1478 * different from the last destination address to
1479 * which the DATA chunk was sent.
1480 */
1481 struct sctp_transport *retran_path;
1482
1483 /* Pointer to last transport I have sent on. */
1484 struct sctp_transport *last_sent_to;
1485
1486 /* This is the last transport I have received DATA on. */
1487 struct sctp_transport *last_data_from;
1488
1489 /*
1490 * Mapping An array of bits or bytes indicating which out of
1491 * Array order TSN's have been received (relative to the
1492 * Last Rcvd TSN). If no gaps exist, i.e. no out of
1493 * order packets have been received, this array
1494 * will be set to all zero. This structure may be
1495 * in the form of a circular buffer or bit array.
1496 *
1497 * Last Rcvd : This is the last TSN received in
1498 * TSN : sequence. This value is set initially by
1499 * : taking the peer's Initial TSN, received in
1500 * : the INIT or INIT ACK chunk, and subtracting
1501 * : one from it.
1502 *
1503 * Throughout most of the specification this is called the
1504 * "Cumulative TSN ACK Point". In this case, we
1505 * ignore the advice in 12.2 in favour of the term
1506 * used in the bulk of the text. This value is hidden
1507 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn().
1508 */
1509 struct sctp_tsnmap tsn_map;
1510
1511 /* This mask is used to disable sending the ASCONF chunk
1512 * with specified parameter to peer.
1513 */
1514 __be16 addip_disabled_mask;
1515
1516 /* These are capabilities which our peer advertised. */
1517 __u8 ecn_capable:1, /* Can peer do ECN? */
1518 ipv4_address:1, /* Peer understands IPv4 addresses? */
1519 ipv6_address:1, /* Peer understands IPv6 addresses? */
1520 hostname_address:1, /* Peer understands DNS addresses? */
1521 asconf_capable:1, /* Does peer support ADDIP? */
1522 prsctp_capable:1, /* Can peer do PR-SCTP? */
1523 auth_capable:1; /* Is peer doing SCTP-AUTH? */
1524
1525 /* sack_needed : This flag indicates if the next received
1526 * : packet is to be responded to with a
1527 * : SACK. This is initialized to 0. When a packet
1528 * : is received sack_cnt is incremented. If this value
1529 * : reaches 2 or more, a SACK is sent and the
1530 * : value is reset to 0. Note: This is used only
1531 * : when no DATA chunks are received out of
1532 * : order. When DATA chunks are out of order,
1533 * : SACK's are not delayed (see Section 6).
1534 */
1535 __u8 sack_needed:1, /* Do we need to sack the peer? */
1536 sack_generation:1,
1537 zero_window_announced:1;
1538 __u32 sack_cnt;
1539
1540 __u32 adaptation_ind; /* Adaptation Code point. */
1541
1542 struct sctp_inithdr_host i;
1543 void *cookie;
1544 int cookie_len;
1545
1546 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk.
1547 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the
1548 * Initial TSN Value minus 1
1549 */
1550 __u32 addip_serial;
1551
1552 /* SCTP-AUTH: We need to know pears random number, hmac list
1553 * and authenticated chunk list. All that is part of the
1554 * cookie and these are just pointers to those locations
1555 */
1556 sctp_random_param_t *peer_random;
1557 sctp_chunks_param_t *peer_chunks;
1558 sctp_hmac_algo_param_t *peer_hmacs;
1559 } peer;
1560
1561 /* State : A state variable indicating what state the
1562 * : association is in, i.e. COOKIE-WAIT,
1563 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING,
1564 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT.
1565 *
1566 * Note: No "CLOSED" state is illustrated since if a
1567 * association is "CLOSED" its TCB SHOULD be removed.
1568 *
1569 * In this implementation we DO have a CLOSED
1570 * state which is used during initiation and shutdown.
1571 *
1572 * State takes values from SCTP_STATE_*.
1573 */
1574 sctp_state_t state;
1575
1576 /* Overall : The overall association error count.
1577 * Error Count : [Clear this any time I get something.]
1578 */
1579 int overall_error_count;
1580
1581 /* The cookie life I award for any cookie. */
1582 ktime_t cookie_life;
1583
1584 /* These are the association's initial, max, and min RTO values.
1585 * These values will be initialized by system defaults, but can
1586 * be modified via the SCTP_RTOINFO socket option.
1587 */
1588 unsigned long rto_initial;
1589 unsigned long rto_max;
1590 unsigned long rto_min;
1591
1592 /* Maximum number of new data packets that can be sent in a burst. */
1593 int max_burst;
1594
1595 /* This is the max_retrans value for the association. This value will
1596 * be initialized initialized from system defaults, but can be
1597 * modified by the SCTP_ASSOCINFO socket option.
1598 */
1599 int max_retrans;
1600
1601 /* This is the partially failed retrans value for the transport
1602 * and will be initialized from the assocs value. This can be
1603 * changed using the SCTP_PEER_ADDR_THLDS socket option
1604 */
1605 int pf_retrans;
1606
1607 /* Maximum number of times the endpoint will retransmit INIT */
1608 __u16 max_init_attempts;
1609
1610 /* How many times have we resent an INIT? */
1611 __u16 init_retries;
1612
1613 /* The largest timeout or RTO value to use in attempting an INIT */
1614 unsigned long max_init_timeo;
1615
1616 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
1617 * the destination address every heartbeat interval. This value
1618 * will be inherited by all new transports.
1619 */
1620 unsigned long hbinterval;
1621
1622 /* This is the max_retrans value for new transports in the
1623 * association.
1624 */
1625 __u16 pathmaxrxt;
1626
1627 /* Flag that path mtu update is pending */
1628 __u8 pmtu_pending;
1629
1630 /* Association : The smallest PMTU discovered for all of the
1631 * PMTU : peer's transport addresses.
1632 */
1633 __u32 pathmtu;
1634
1635 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
1636 __u32 param_flags;
1637
1638 __u32 sackfreq;
1639 /* SACK delay timeout */
1640 unsigned long sackdelay;
1641
1642 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES];
1643 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES];
1644
1645 /* Transport to which SHUTDOWN chunk was last sent. */
1646 struct sctp_transport *shutdown_last_sent_to;
1647
1648 /* Transport to which INIT chunk was last sent. */
1649 struct sctp_transport *init_last_sent_to;
1650
1651 /* How many times have we resent a SHUTDOWN */
1652 int shutdown_retries;
1653
1654 /* Next TSN : The next TSN number to be assigned to a new
1655 * : DATA chunk. This is sent in the INIT or INIT
1656 * : ACK chunk to the peer and incremented each
1657 * : time a DATA chunk is assigned a TSN
1658 * : (normally just prior to transmit or during
1659 * : fragmentation).
1660 */
1661 __u32 next_tsn;
1662
1663 /*
1664 * Last Rcvd : This is the last TSN received in sequence. This value
1665 * TSN : is set initially by taking the peer's Initial TSN,
1666 * : received in the INIT or INIT ACK chunk, and
1667 * : subtracting one from it.
1668 *
1669 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point.
1670 */
1671
1672 __u32 ctsn_ack_point;
1673
1674 /* PR-SCTP Advanced.Peer.Ack.Point */
1675 __u32 adv_peer_ack_point;
1676
1677 /* Highest TSN that is acknowledged by incoming SACKs. */
1678 __u32 highest_sacked;
1679
1680 /* TSN marking the fast recovery exit point */
1681 __u32 fast_recovery_exit;
1682
1683 /* Flag to track the current fast recovery state */
1684 __u8 fast_recovery;
1685
1686 /* The number of unacknowledged data chunks. Reported through
1687 * the SCTP_STATUS sockopt.
1688 */
1689 __u16 unack_data;
1690
1691 /* The total number of data chunks that we've had to retransmit
1692 * as the result of a T3 timer expiration
1693 */
1694 __u32 rtx_data_chunks;
1695
1696 /* This is the association's receive buffer space. This value is used
1697 * to set a_rwnd field in an INIT or a SACK chunk.
1698 */
1699 __u32 rwnd;
1700
1701 /* This is the last advertised value of rwnd over a SACK chunk. */
1702 __u32 a_rwnd;
1703
1704 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed
1705 * to slop over a maximum of the association's frag_point.
1706 */
1707 __u32 rwnd_over;
1708
1709 /* Keeps treack of rwnd pressure. This happens when we have
1710 * a window, but not recevie buffer (i.e small packets). This one
1711 * is releases slowly (1 PMTU at a time ).
1712 */
1713 __u32 rwnd_press;
1714
1715 /* This is the sndbuf size in use for the association.
1716 * This corresponds to the sndbuf size for the association,
1717 * as specified in the sk->sndbuf.
1718 */
1719 int sndbuf_used;
1720
1721 /* This is the amount of memory that this association has allocated
1722 * in the receive path at any given time.
1723 */
1724 atomic_t rmem_alloc;
1725
1726 /* This is the wait queue head for send requests waiting on
1727 * the association sndbuf space.
1728 */
1729 wait_queue_head_t wait;
1730
1731 /* The message size at which SCTP fragmentation will occur. */
1732 __u32 frag_point;
1733 __u32 user_frag;
1734
1735 /* Counter used to count INIT errors. */
1736 int init_err_counter;
1737
1738 /* Count the number of INIT cycles (for doubling timeout). */
1739 int init_cycle;
1740
1741 /* Default send parameters. */
1742 __u16 default_stream;
1743 __u16 default_flags;
1744 __u32 default_ppid;
1745 __u32 default_context;
1746 __u32 default_timetolive;
1747
1748 /* Default receive parameters */
1749 __u32 default_rcv_context;
1750
1751 /* This tracks outbound ssn for a given stream. */
1752 struct sctp_ssnmap *ssnmap;
1753
1754 /* All outbound chunks go through this structure. */
1755 struct sctp_outq outqueue;
1756
1757 /* A smart pipe that will handle reordering and fragmentation,
1758 * as well as handle passing events up to the ULP.
1759 */
1760 struct sctp_ulpq ulpq;
1761
1762 /* Last TSN that caused an ECNE Chunk to be sent. */
1763 __u32 last_ecne_tsn;
1764
1765 /* Last TSN that caused a CWR Chunk to be sent. */
1766 __u32 last_cwr_tsn;
1767
1768 /* How many duplicated TSNs have we seen? */
1769 int numduptsns;
1770
1771 /* These are to support
1772 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses
1773 * and Enforcement of Flow and Message Limits"
1774 * <draft-ietf-tsvwg-addip-sctp-02.txt>
1775 * or "ADDIP" for short.
1776 */
1777
1778
1779
1780 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
1781 *
1782 * R1) One and only one ASCONF Chunk MAY be in transit and
1783 * unacknowledged at any one time. If a sender, after sending
1784 * an ASCONF chunk, decides it needs to transfer another
1785 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
1786 * returns from the previous ASCONF Chunk before sending a
1787 * subsequent ASCONF. Note this restriction binds each side,
1788 * so at any time two ASCONF may be in-transit on any given
1789 * association (one sent from each endpoint).
1790 *
1791 * [This is our one-and-only-one ASCONF in flight. If we do
1792 * not have an ASCONF in flight, this is NULL.]
1793 */
1794 struct sctp_chunk *addip_last_asconf;
1795
1796 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk.
1797 *
1798 * This is needed to implement itmes E1 - E4 of the updated
1799 * spec. Here is the justification:
1800 *
1801 * Since the peer may bundle multiple ASCONF chunks toward us,
1802 * we now need the ability to cache multiple ACKs. The section
1803 * describes in detail how they are cached and cleaned up.
1804 */
1805 struct list_head asconf_ack_list;
1806
1807 /* These ASCONF chunks are waiting to be sent.
1808 *
1809 * These chunaks can't be pushed to outqueue until receiving
1810 * ASCONF_ACK for the previous ASCONF indicated by
1811 * addip_last_asconf, so as to guarantee that only one ASCONF
1812 * is in flight at any time.
1813 *
1814 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
1815 *
1816 * In defining the ASCONF Chunk transfer procedures, it is
1817 * essential that these transfers MUST NOT cause congestion
1818 * within the network. To achieve this, we place these
1819 * restrictions on the transfer of ASCONF Chunks:
1820 *
1821 * R1) One and only one ASCONF Chunk MAY be in transit and
1822 * unacknowledged at any one time. If a sender, after sending
1823 * an ASCONF chunk, decides it needs to transfer another
1824 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
1825 * returns from the previous ASCONF Chunk before sending a
1826 * subsequent ASCONF. Note this restriction binds each side,
1827 * so at any time two ASCONF may be in-transit on any given
1828 * association (one sent from each endpoint).
1829 *
1830 *
1831 * [I really think this is EXACTLY the sort of intelligence
1832 * which already resides in sctp_outq. Please move this
1833 * queue and its supporting logic down there. --piggy]
1834 */
1835 struct list_head addip_chunk_list;
1836
1837 /* ADDIP Section 4.1 ASCONF Chunk Procedures
1838 *
1839 * A2) A serial number should be assigned to the Chunk. The
1840 * serial number SHOULD be a monotonically increasing
1841 * number. The serial number SHOULD be initialized at
1842 * the start of the association to the same value as the
1843 * Initial TSN and every time a new ASCONF chunk is created
1844 * it is incremented by one after assigning the serial number
1845 * to the newly created chunk.
1846 *
1847 * ADDIP
1848 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF)
1849 *
1850 * Serial Number : 32 bits (unsigned integer)
1851 *
1852 * This value represents a Serial Number for the ASCONF
1853 * Chunk. The valid range of Serial Number is from 0 to
1854 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0
1855 * after reaching 4294967295.
1856 */
1857 __u32 addip_serial;
1858 int src_out_of_asoc_ok;
1859 union sctp_addr *asconf_addr_del_pending;
1860 struct sctp_transport *new_transport;
1861
1862 /* SCTP AUTH: list of the endpoint shared keys. These
1863 * keys are provided out of band by the user applicaton
1864 * and can't change during the lifetime of the association
1865 */
1866 struct list_head endpoint_shared_keys;
1867
1868 /* SCTP AUTH:
1869 * The current generated assocaition shared key (secret)
1870 */
1871 struct sctp_auth_bytes *asoc_shared_key;
1872
1873 /* SCTP AUTH: hmac id of the first peer requested algorithm
1874 * that we support.
1875 */
1876 __u16 default_hmac_id;
1877
1878 __u16 active_key_id;
1879
1880 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */
1881 temp:1, /* Is it a temporary association? */
1882 prsctp_enable:1;
1883
1884 struct sctp_priv_assoc_stats stats;
1885
1886 int sent_cnt_removable;
1887
1888 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1];
1889 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1];
1890 };
1891
1892
1893 /* An eyecatcher for determining if we are really looking at an
1894 * association data structure.
1895 */
1896 enum {
1897 SCTP_ASSOC_EYECATCHER = 0xa550c123,
1898 };
1899
1900 /* Recover the outter association structure. */
sctp_assoc(struct sctp_ep_common * base)1901 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base)
1902 {
1903 struct sctp_association *asoc;
1904
1905 asoc = container_of(base, struct sctp_association, base);
1906 return asoc;
1907 }
1908
1909 /* These are function signatures for manipulating associations. */
1910
1911
1912 struct sctp_association *
1913 sctp_association_new(const struct sctp_endpoint *, const struct sock *,
1914 sctp_scope_t scope, gfp_t gfp);
1915 void sctp_association_free(struct sctp_association *);
1916 void sctp_association_put(struct sctp_association *);
1917 void sctp_association_hold(struct sctp_association *);
1918
1919 struct sctp_transport *sctp_assoc_choose_alter_transport(
1920 struct sctp_association *, struct sctp_transport *);
1921 void sctp_assoc_update_retran_path(struct sctp_association *);
1922 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *,
1923 const union sctp_addr *);
1924 int sctp_assoc_lookup_laddr(struct sctp_association *asoc,
1925 const union sctp_addr *laddr);
1926 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *,
1927 const union sctp_addr *address,
1928 const gfp_t gfp,
1929 const int peer_state);
1930 void sctp_assoc_del_peer(struct sctp_association *asoc,
1931 const union sctp_addr *addr);
1932 void sctp_assoc_rm_peer(struct sctp_association *asoc,
1933 struct sctp_transport *peer);
1934 void sctp_assoc_control_transport(struct sctp_association *,
1935 struct sctp_transport *,
1936 sctp_transport_cmd_t, sctp_sn_error_t);
1937 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32);
1938 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *,
1939 struct net *,
1940 const union sctp_addr *,
1941 const union sctp_addr *);
1942 void sctp_assoc_migrate(struct sctp_association *, struct sock *);
1943 void sctp_assoc_update(struct sctp_association *old,
1944 struct sctp_association *new);
1945
1946 __u32 sctp_association_get_next_tsn(struct sctp_association *);
1947
1948 void sctp_assoc_sync_pmtu(struct sock *, struct sctp_association *);
1949 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int);
1950 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int);
1951 void sctp_assoc_set_primary(struct sctp_association *,
1952 struct sctp_transport *);
1953 void sctp_assoc_del_nonprimary_peers(struct sctp_association *,
1954 struct sctp_transport *);
1955 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *,
1956 sctp_scope_t, gfp_t);
1957 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *,
1958 struct sctp_cookie*,
1959 gfp_t gfp);
1960 int sctp_assoc_set_id(struct sctp_association *, gfp_t);
1961 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc);
1962 struct sctp_chunk *sctp_assoc_lookup_asconf_ack(
1963 const struct sctp_association *asoc,
1964 __be32 serial);
1965 void sctp_asconf_queue_teardown(struct sctp_association *asoc);
1966
1967 int sctp_cmp_addr_exact(const union sctp_addr *ss1,
1968 const union sctp_addr *ss2);
1969 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc);
1970
1971 /* A convenience structure to parse out SCTP specific CMSGs. */
1972 typedef struct sctp_cmsgs {
1973 struct sctp_initmsg *init;
1974 struct sctp_sndrcvinfo *srinfo;
1975 struct sctp_sndinfo *sinfo;
1976 } sctp_cmsgs_t;
1977
1978 /* Structure for tracking memory objects */
1979 typedef struct {
1980 char *label;
1981 atomic_t *counter;
1982 } sctp_dbg_objcnt_entry_t;
1983
1984 #endif /* __sctp_structs_h__ */
1985