]>
Commit | Line | Data |
---|---|---|
60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
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 | * | |
60c778b2 | 7 | * This file is part of the SCTP kernel implementation |
1da177e4 | 8 | * |
60c778b2 | 9 | * This SCTP implementation is free software; |
1da177e4 LT |
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 | * | |
60c778b2 | 15 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
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 | |
4b2f13a2 JK |
22 | * along with GNU CC; see the file COPYING. If not, see |
23 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
24 | * |
25 | * Please send any bug reports or fixes you make to the | |
26 | * email addresses: | |
91705c61 | 27 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 28 | * |
1da177e4 LT |
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> | |
1da177e4 LT |
45 | */ |
46 | ||
47 | #ifndef __sctp_structs_h__ | |
48 | #define __sctp_structs_h__ | |
49 | ||
52db882f | 50 | #include <linux/ktime.h> |
0eb71a9d | 51 | #include <linux/rhashtable-types.h> |
1da177e4 LT |
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. */ | |
60063497 | 57 | #include <linux/atomic.h> /* This gets us atomic counters. */ |
1da177e4 LT |
58 | #include <linux/skbuff.h> /* We need sk_buff_head. */ |
59 | #include <linux/workqueue.h> /* We need tq_struct. */ | |
0d493b4d | 60 | #include <linux/flex_array.h> /* We need flex_array. */ |
1da177e4 | 61 | #include <linux/sctp.h> /* We need sctp* header structs. */ |
1f485649 | 62 | #include <net/sctp/auth.h> /* We need auth specific structs */ |
9e238323 | 63 | #include <net/ip.h> /* For inet_skb_parm */ |
1da177e4 LT |
64 | |
65 | /* A convenience structure for handling sockaddr structures. | |
66 | * We should wean ourselves off this. | |
67 | */ | |
68 | union sctp_addr { | |
69 | struct sockaddr_in v4; | |
70 | struct sockaddr_in6 v6; | |
71 | struct sockaddr sa; | |
72 | }; | |
73 | ||
74 | /* Forward declarations for data structures. */ | |
75 | struct sctp_globals; | |
76 | struct sctp_endpoint; | |
77 | struct sctp_association; | |
78 | struct sctp_transport; | |
79 | struct sctp_packet; | |
80 | struct sctp_chunk; | |
81 | struct sctp_inq; | |
82 | struct sctp_outq; | |
83 | struct sctp_bind_addr; | |
84 | struct sctp_ulpq; | |
85 | struct sctp_ep_common; | |
5821c769 | 86 | struct crypto_shash; |
1511949c | 87 | struct sctp_stream; |
1da177e4 LT |
88 | |
89 | ||
90 | #include <net/sctp/tsnmap.h> | |
91 | #include <net/sctp/ulpevent.h> | |
92 | #include <net/sctp/ulpqueue.h> | |
0c3f6f65 | 93 | #include <net/sctp/stream_interleave.h> |
1da177e4 LT |
94 | |
95 | /* Structures useful for managing bind/connect. */ | |
96 | ||
97 | struct sctp_bind_bucket { | |
98 | unsigned short port; | |
6ba84574 XL |
99 | signed char fastreuse; |
100 | signed char fastreuseport; | |
101 | kuid_t fastuid; | |
d970dbf8 | 102 | struct hlist_node node; |
1da177e4 | 103 | struct hlist_head owner; |
f1f43763 | 104 | struct net *net; |
1da177e4 LT |
105 | }; |
106 | ||
107 | struct sctp_bind_hashbucket { | |
108 | spinlock_t lock; | |
d970dbf8 | 109 | struct hlist_head chain; |
1da177e4 LT |
110 | }; |
111 | ||
112 | /* Used for hashing all associations. */ | |
113 | struct sctp_hashbucket { | |
114 | rwlock_t lock; | |
d970dbf8 | 115 | struct hlist_head chain; |
1da177e4 LT |
116 | } __attribute__((__aligned__(8))); |
117 | ||
118 | ||
119 | /* The SCTP globals structure. */ | |
120 | extern struct sctp_globals { | |
1da177e4 LT |
121 | /* This is a list of groups of functions for each address |
122 | * family that we support. | |
123 | */ | |
124 | struct list_head address_families; | |
125 | ||
126 | /* This is the hash of all endpoints. */ | |
1da177e4 | 127 | struct sctp_hashbucket *ep_hashtable; |
1da177e4 | 128 | /* This is the sctp port control hash. */ |
1da177e4 | 129 | struct sctp_bind_hashbucket *port_hashtable; |
d6c0256a | 130 | /* This is the hash of all transports. */ |
7fda702f | 131 | struct rhltable transport_hashtable; |
71acc0dd | 132 | |
76bfd898 DB |
133 | /* Sizes of above hashtables. */ |
134 | int ep_hashsize; | |
76bfd898 DB |
135 | int port_hashsize; |
136 | ||
137 | /* Default initialization values to be applied to new associations. */ | |
138 | __u16 max_instreams; | |
139 | __u16 max_outstreams; | |
140 | ||
71acc0dd DM |
141 | /* Flag to indicate whether computing and verifying checksum |
142 | * is disabled. */ | |
143 | bool checksum_disable; | |
1da177e4 LT |
144 | } sctp_globals; |
145 | ||
1da177e4 LT |
146 | #define sctp_max_instreams (sctp_globals.max_instreams) |
147 | #define sctp_max_outstreams (sctp_globals.max_outstreams) | |
148 | #define sctp_address_families (sctp_globals.address_families) | |
149 | #define sctp_ep_hashsize (sctp_globals.ep_hashsize) | |
150 | #define sctp_ep_hashtable (sctp_globals.ep_hashtable) | |
1da177e4 | 151 | #define sctp_port_hashsize (sctp_globals.port_hashsize) |
1da177e4 | 152 | #define sctp_port_hashtable (sctp_globals.port_hashtable) |
d6c0256a | 153 | #define sctp_transport_hashtable (sctp_globals.transport_hashtable) |
71acc0dd | 154 | #define sctp_checksum_disable (sctp_globals.checksum_disable) |
1da177e4 LT |
155 | |
156 | /* SCTP Socket type: UDP or TCP style. */ | |
b7ef2618 | 157 | enum sctp_socket_type { |
1da177e4 LT |
158 | SCTP_SOCKET_UDP = 0, |
159 | SCTP_SOCKET_UDP_HIGH_BANDWIDTH, | |
160 | SCTP_SOCKET_TCP | |
b7ef2618 | 161 | }; |
1da177e4 LT |
162 | |
163 | /* Per socket SCTP information. */ | |
164 | struct sctp_sock { | |
165 | /* inet_sock has to be the first member of sctp_sock */ | |
166 | struct inet_sock inet; | |
167 | /* What kind of a socket is this? */ | |
b7ef2618 | 168 | enum sctp_socket_type type; |
1da177e4 LT |
169 | |
170 | /* PF_ family specific functions. */ | |
171 | struct sctp_pf *pf; | |
172 | ||
173 | /* Access to HMAC transform. */ | |
5821c769 | 174 | struct crypto_shash *hmac; |
3c68198e | 175 | char *sctp_hmac_alg; |
1da177e4 LT |
176 | |
177 | /* What is our base endpointer? */ | |
178 | struct sctp_endpoint *ep; | |
179 | ||
180 | struct sctp_bind_bucket *bind_hash; | |
181 | /* Various Socket Options. */ | |
182 | __u16 default_stream; | |
183 | __u32 default_ppid; | |
184 | __u16 default_flags; | |
185 | __u32 default_context; | |
186 | __u32 default_timetolive; | |
6ab792f5 | 187 | __u32 default_rcv_context; |
70331571 | 188 | int max_burst; |
1da177e4 | 189 | |
52ccb8e9 FF |
190 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
191 | * the destination address every heartbeat interval. This value | |
192 | * will be inherited by all new associations. | |
193 | */ | |
194 | __u32 hbinterval; | |
195 | ||
196 | /* This is the max_retrans value for new associations. */ | |
197 | __u16 pathmaxrxt; | |
198 | ||
8a9c58d2 XL |
199 | __u32 flowlabel; |
200 | __u8 dscp; | |
201 | ||
8add543e XL |
202 | int pf_retrans; |
203 | ||
52ccb8e9 FF |
204 | /* The initial Path MTU to use for new associations. */ |
205 | __u32 pathmtu; | |
206 | ||
207 | /* The default SACK delay timeout for new associations. */ | |
208 | __u32 sackdelay; | |
d364d927 | 209 | __u32 sackfreq; |
52ccb8e9 | 210 | |
f4ab2f72 | 211 | /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
52ccb8e9 FF |
212 | __u32 param_flags; |
213 | ||
7efba10d XL |
214 | __u32 default_ss; |
215 | ||
1da177e4 LT |
216 | struct sctp_rtoinfo rtoinfo; |
217 | struct sctp_paddrparams paddrparam; | |
1da177e4 | 218 | struct sctp_assocparams assocparams; |
0d3a421d | 219 | |
ab9ee8e3 DW |
220 | /* |
221 | * These two structures must be grouped together for the usercopy | |
222 | * whitelist region. | |
223 | */ | |
2cc0eeb6 | 224 | __u16 subscribe; |
ab9ee8e3 DW |
225 | struct sctp_initmsg initmsg; |
226 | ||
1da177e4 | 227 | int user_frag; |
0d3a421d | 228 | |
1da177e4 | 229 | __u32 autoclose; |
0f3fffd8 | 230 | __u32 adaptation_ind; |
d49d91d7 | 231 | __u32 pd_point; |
250eb1f8 | 232 | __u16 nodelay:1, |
b0e9a2fe | 233 | reuse:1, |
250eb1f8 MRL |
234 | disable_fragments:1, |
235 | v4mapped:1, | |
236 | frag_interleave:1, | |
772a5869 | 237 | strm_interleave:1, |
250eb1f8 | 238 | recvrcvinfo:1, |
fb586f25 | 239 | recvnxtinfo:1, |
0970f5b3 | 240 | data_ready_signalled:1; |
1da177e4 | 241 | |
b6e1331f | 242 | atomic_t pd_mode; |
1da177e4 LT |
243 | /* Receive to here while partial delivery is in effect. */ |
244 | struct sk_buff_head pd_lobby; | |
2d45a02d MRL |
245 | |
246 | /* These must be the last fields, as they will skipped on copies, | |
247 | * like on accept and peeloff operations | |
248 | */ | |
9f7d653b MH |
249 | struct list_head auto_asconf_list; |
250 | int do_auto_asconf; | |
1da177e4 LT |
251 | }; |
252 | ||
253 | static inline struct sctp_sock *sctp_sk(const struct sock *sk) | |
254 | { | |
255 | return (struct sctp_sock *)sk; | |
256 | } | |
257 | ||
258 | static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) | |
259 | { | |
260 | return (struct sock *)sp; | |
261 | } | |
262 | ||
dfd56b8b | 263 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
264 | struct sctp6_sock { |
265 | struct sctp_sock sctp; | |
266 | struct ipv6_pinfo inet6; | |
267 | }; | |
268 | #endif /* CONFIG_IPV6 */ | |
269 | ||
270 | ||
271 | /* This is our APPLICATION-SPECIFIC state cookie. | |
272 | * THIS IS NOT DICTATED BY THE SPECIFICATION. | |
273 | */ | |
274 | /* These are the parts of an association which we send in the cookie. | |
275 | * Most of these are straight out of: | |
276 | * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) | |
277 | * | |
278 | */ | |
279 | ||
280 | struct sctp_cookie { | |
281 | ||
282 | /* My : Tag expected in every inbound packet and sent | |
283 | * Verification: in the INIT or INIT ACK chunk. | |
284 | * Tag : | |
285 | */ | |
286 | __u32 my_vtag; | |
287 | ||
288 | /* Peer's : Tag expected in every outbound packet except | |
289 | * Verification: in the INIT chunk. | |
290 | * Tag : | |
291 | */ | |
292 | __u32 peer_vtag; | |
293 | ||
294 | /* The rest of these are not from the spec, but really need to | |
295 | * be in the cookie. | |
296 | */ | |
297 | ||
298 | /* My Tie Tag : Assist in discovering a restarting association. */ | |
299 | __u32 my_ttag; | |
300 | ||
301 | /* Peer's Tie Tag: Assist in discovering a restarting association. */ | |
302 | __u32 peer_ttag; | |
303 | ||
304 | /* When does this cookie expire? */ | |
52db882f | 305 | ktime_t expiration; |
1da177e4 LT |
306 | |
307 | /* Number of inbound/outbound streams which are set | |
308 | * and negotiated during the INIT process. | |
309 | */ | |
310 | __u16 sinit_num_ostreams; | |
311 | __u16 sinit_max_instreams; | |
312 | ||
313 | /* This is the first sequence number I used. */ | |
314 | __u32 initial_tsn; | |
315 | ||
316 | /* This holds the originating address of the INIT packet. */ | |
317 | union sctp_addr peer_addr; | |
318 | ||
319 | /* IG Section 2.35.3 | |
320 | * Include the source port of the INIT-ACK | |
321 | */ | |
322 | __u16 my_port; | |
323 | ||
324 | __u8 prsctp_capable; | |
325 | ||
326 | /* Padding for future use */ | |
327 | __u8 padding; | |
328 | ||
0f3fffd8 | 329 | __u32 adaptation_ind; |
1da177e4 | 330 | |
3c918704 XL |
331 | __u8 auth_random[sizeof(struct sctp_paramhdr) + |
332 | SCTP_AUTH_RANDOM_LENGTH]; | |
028dba0a | 333 | __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; |
3c918704 | 334 | __u8 auth_chunks[sizeof(struct sctp_paramhdr) + SCTP_AUTH_MAX_CHUNKS]; |
1da177e4 LT |
335 | |
336 | /* This is a shim for my peer's INIT packet, followed by | |
337 | * a copy of the raw address list of the association. | |
338 | * The length of the raw address list is saved in the | |
339 | * raw_addr_list_len field, which will be used at the time when | |
340 | * the association TCB is re-constructed from the cookie. | |
341 | */ | |
342 | __u32 raw_addr_list_len; | |
343 | struct sctp_init_chunk peer_init[0]; | |
344 | }; | |
345 | ||
346 | ||
347 | /* The format of our cookie that we send to our peer. */ | |
348 | struct sctp_signed_cookie { | |
349 | __u8 signature[SCTP_SECRET_SIZE]; | |
9834a2bb | 350 | __u32 __pad; /* force sctp_cookie alignment to 64 bits */ |
1da177e4 | 351 | struct sctp_cookie c; |
bc10502d | 352 | } __packed; |
1da177e4 LT |
353 | |
354 | /* This is another convenience type to allocate memory for address | |
355 | * params for the maximum size and pass such structures around | |
356 | * internally. | |
357 | */ | |
358 | union sctp_addr_param { | |
6f4c618d | 359 | struct sctp_paramhdr p; |
1da177e4 LT |
360 | struct sctp_ipv4addr_param v4; |
361 | struct sctp_ipv6addr_param v6; | |
362 | }; | |
363 | ||
364 | /* A convenience type to allow walking through the various | |
365 | * parameters and avoid casting all over the place. | |
366 | */ | |
367 | union sctp_params { | |
368 | void *v; | |
369 | struct sctp_paramhdr *p; | |
370 | struct sctp_cookie_preserve_param *life; | |
371 | struct sctp_hostname_param *dns; | |
372 | struct sctp_cookie_param *cookie; | |
373 | struct sctp_supported_addrs_param *sat; | |
374 | struct sctp_ipv4addr_param *v4; | |
375 | struct sctp_ipv6addr_param *v6; | |
376 | union sctp_addr_param *addr; | |
0f3fffd8 | 377 | struct sctp_adaptation_ind_param *aind; |
131a47e3 | 378 | struct sctp_supported_ext_param *ext; |
1f485649 VY |
379 | struct sctp_random_param *random; |
380 | struct sctp_chunks_param *chunks; | |
381 | struct sctp_hmac_algo_param *hmac_algo; | |
d6de3097 | 382 | struct sctp_addip_param *addip; |
1da177e4 LT |
383 | }; |
384 | ||
385 | /* RFC 2960. Section 3.3.5 Heartbeat. | |
386 | * Heartbeat Information: variable length | |
387 | * The Sender-specific Heartbeat Info field should normally include | |
388 | * information about the sender's current time when this HEARTBEAT | |
389 | * chunk is sent and the destination transport address to which this | |
390 | * HEARTBEAT is sent (see Section 8.3). | |
391 | */ | |
edf903f8 | 392 | struct sctp_sender_hb_info { |
1da177e4 LT |
393 | struct sctp_paramhdr param_hdr; |
394 | union sctp_addr daddr; | |
395 | unsigned long sent_at; | |
ad8fec17 | 396 | __u64 hb_nonce; |
edf903f8 | 397 | }; |
1da177e4 | 398 | |
ff356414 XL |
399 | int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, |
400 | gfp_t gfp); | |
f952be79 | 401 | int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid); |
a8386317 XL |
402 | void sctp_stream_free(struct sctp_stream *stream); |
403 | void sctp_stream_clear(struct sctp_stream *stream); | |
cee360ab | 404 | void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new); |
1da177e4 LT |
405 | |
406 | /* What is the current SSN number for this stream? */ | |
a8386317 | 407 | #define sctp_ssn_peek(stream, type, sid) \ |
05364ca0 | 408 | (sctp_stream_##type((stream), (sid))->ssn) |
1da177e4 LT |
409 | |
410 | /* Return the next SSN number for this stream. */ | |
a8386317 | 411 | #define sctp_ssn_next(stream, type, sid) \ |
05364ca0 | 412 | (sctp_stream_##type((stream), (sid))->ssn++) |
1da177e4 LT |
413 | |
414 | /* Skip over this ssn and all below. */ | |
a8386317 | 415 | #define sctp_ssn_skip(stream, type, sid, ssn) \ |
05364ca0 | 416 | (sctp_stream_##type((stream), (sid))->ssn = ssn + 1) |
a8386317 | 417 | |
668c9beb XL |
418 | /* What is the current MID number for this stream? */ |
419 | #define sctp_mid_peek(stream, type, sid) \ | |
05364ca0 | 420 | (sctp_stream_##type((stream), (sid))->mid) |
668c9beb XL |
421 | |
422 | /* Return the next MID number for this stream. */ | |
423 | #define sctp_mid_next(stream, type, sid) \ | |
05364ca0 | 424 | (sctp_stream_##type((stream), (sid))->mid++) |
668c9beb XL |
425 | |
426 | /* Skip over this mid and all below. */ | |
427 | #define sctp_mid_skip(stream, type, sid, mid) \ | |
05364ca0 | 428 | (sctp_stream_##type((stream), (sid))->mid = mid + 1) |
bd4d627d | 429 | |
13228238 XL |
430 | /* What is the current MID_uo number for this stream? */ |
431 | #define sctp_mid_uo_peek(stream, type, sid) \ | |
05364ca0 | 432 | (sctp_stream_##type((stream), (sid))->mid_uo) |
13228238 XL |
433 | |
434 | /* Return the next MID_uo number for this stream. */ | |
435 | #define sctp_mid_uo_next(stream, type, sid) \ | |
05364ca0 | 436 | (sctp_stream_##type((stream), (sid))->mid_uo++) |
13228238 | 437 | |
1da177e4 LT |
438 | /* |
439 | * Pointers to address related SCTP functions. | |
440 | * (i.e. things that depend on the address family.) | |
441 | */ | |
442 | struct sctp_af { | |
443 | int (*sctp_xmit) (struct sk_buff *skb, | |
f880374c | 444 | struct sctp_transport *); |
1da177e4 LT |
445 | int (*setsockopt) (struct sock *sk, |
446 | int level, | |
447 | int optname, | |
448 | char __user *optval, | |
b7058842 | 449 | unsigned int optlen); |
1da177e4 LT |
450 | int (*getsockopt) (struct sock *sk, |
451 | int level, | |
452 | int optname, | |
453 | char __user *optval, | |
454 | int __user *optlen); | |
3fdadf7d DM |
455 | int (*compat_setsockopt) (struct sock *sk, |
456 | int level, | |
457 | int optname, | |
458 | char __user *optval, | |
b7058842 | 459 | unsigned int optlen); |
3fdadf7d DM |
460 | int (*compat_getsockopt) (struct sock *sk, |
461 | int level, | |
462 | int optname, | |
463 | char __user *optval, | |
464 | int __user *optlen); | |
da0420be | 465 | void (*get_dst) (struct sctp_transport *t, |
9914ae3c VY |
466 | union sctp_addr *saddr, |
467 | struct flowi *fl, | |
468 | struct sock *sk); | |
e5117101 | 469 | void (*get_saddr) (struct sctp_sock *sk, |
9914ae3c | 470 | struct sctp_transport *t, |
9914ae3c | 471 | struct flowi *fl); |
1da177e4 LT |
472 | void (*copy_addrlist) (struct list_head *, |
473 | struct net_device *); | |
1da177e4 LT |
474 | int (*cmp_addr) (const union sctp_addr *addr1, |
475 | const union sctp_addr *addr2); | |
476 | void (*addr_copy) (union sctp_addr *dst, | |
477 | union sctp_addr *src); | |
478 | void (*from_skb) (union sctp_addr *, | |
479 | struct sk_buff *skb, | |
480 | int saddr); | |
481 | void (*from_sk) (union sctp_addr *, | |
482 | struct sock *sk); | |
1da177e4 LT |
483 | void (*from_addr_param) (union sctp_addr *, |
484 | union sctp_addr_param *, | |
dd86d136 | 485 | __be16 port, int iif); |
1da177e4 LT |
486 | int (*to_addr_param) (const union sctp_addr *, |
487 | union sctp_addr_param *); | |
488 | int (*addr_valid) (union sctp_addr *, | |
5636bef7 VY |
489 | struct sctp_sock *, |
490 | const struct sk_buff *); | |
1c662018 | 491 | enum sctp_scope (*scope)(union sctp_addr *); |
6fbfa9f9 | 492 | void (*inaddr_any) (union sctp_addr *, __be16); |
1da177e4 LT |
493 | int (*is_any) (const union sctp_addr *); |
494 | int (*available) (union sctp_addr *, | |
495 | struct sctp_sock *); | |
496 | int (*skb_iif) (const struct sk_buff *sk); | |
497 | int (*is_ce) (const struct sk_buff *sk); | |
498 | void (*seq_dump_addr)(struct seq_file *seq, | |
499 | union sctp_addr *addr); | |
b9031d9d | 500 | void (*ecn_capable)(struct sock *sk); |
1da177e4 LT |
501 | __u16 net_header_len; |
502 | int sockaddr_len; | |
b7e10c25 | 503 | int (*ip_options_len)(struct sock *sk); |
1da177e4 LT |
504 | sa_family_t sa_family; |
505 | struct list_head list; | |
506 | }; | |
507 | ||
508 | struct sctp_af *sctp_get_af_specific(sa_family_t); | |
509 | int sctp_register_af(struct sctp_af *); | |
510 | ||
511 | /* Protocol family functions. */ | |
512 | struct sctp_pf { | |
513 | void (*event_msgname)(struct sctp_ulpevent *, char *, int *); | |
514 | void (*skb_msgname) (struct sk_buff *, char *, int *); | |
515 | int (*af_supported) (sa_family_t, struct sctp_sock *); | |
516 | int (*cmp_addr) (const union sctp_addr *, | |
517 | const union sctp_addr *, | |
518 | struct sctp_sock *); | |
519 | int (*bind_verify) (struct sctp_sock *, union sctp_addr *); | |
520 | int (*send_verify) (struct sctp_sock *, union sctp_addr *); | |
3dbe8656 | 521 | int (*supported_addrs)(const struct sctp_sock *, __be16 *); |
1da177e4 | 522 | struct sock *(*create_accept_sk) (struct sock *sk, |
cdfbabfb DH |
523 | struct sctp_association *asoc, |
524 | bool kern); | |
299ee123 JG |
525 | int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); |
526 | void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); | |
527 | void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); | |
b7e10c25 | 528 | void (*copy_ip_options)(struct sock *sk, struct sock *newsk); |
1da177e4 LT |
529 | struct sctp_af *af; |
530 | }; | |
531 | ||
532 | ||
533 | /* Structure to track chunk fragments that have been acked, but peer | |
534 | * fragments of the same message have not. | |
535 | */ | |
536 | struct sctp_datamsg { | |
537 | /* Chunks waiting to be submitted to lower layer. */ | |
538 | struct list_head chunks; | |
1da177e4 | 539 | /* Reference counting. */ |
c0acdfb4 | 540 | refcount_t refcnt; |
1da177e4 LT |
541 | /* When is this message no longer interesting to the peer? */ |
542 | unsigned long expires_at; | |
543 | /* Did the messenge fail to send? */ | |
544 | int send_error; | |
0e3aef8d | 545 | u8 send_failed:1, |
e5f61296 XL |
546 | can_delay:1, /* should this message be Nagle delayed */ |
547 | abandoned:1; /* should this message be abandoned */ | |
1da177e4 LT |
548 | }; |
549 | ||
550 | struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, | |
551 | struct sctp_sndrcvinfo *, | |
e0eb093e | 552 | struct iov_iter *); |
b61c654f | 553 | void sctp_datamsg_free(struct sctp_datamsg *); |
1da177e4 | 554 | void sctp_datamsg_put(struct sctp_datamsg *); |
1da177e4 LT |
555 | void sctp_chunk_fail(struct sctp_chunk *, int error); |
556 | int sctp_chunk_abandoned(struct sctp_chunk *); | |
557 | ||
1da177e4 LT |
558 | /* RFC2960 1.4 Key Terms |
559 | * | |
560 | * o Chunk: A unit of information within an SCTP packet, consisting of | |
561 | * a chunk header and chunk-specific content. | |
562 | * | |
563 | * As a matter of convenience, we remember the SCTP common header for | |
564 | * each chunk as well as a few other header pointers... | |
565 | */ | |
566 | struct sctp_chunk { | |
79af02c2 DM |
567 | struct list_head list; |
568 | ||
e7f02796 | 569 | refcount_t refcnt; |
1da177e4 | 570 | |
73dca124 XL |
571 | /* How many times this chunk have been sent, for prsctp RTX policy */ |
572 | int sent_count; | |
573 | ||
5bbbbe32 MRL |
574 | union { |
575 | /* This is our link to the per-transport transmitted list. */ | |
576 | struct list_head transmitted_list; | |
577 | /* List in specific stream outq */ | |
578 | struct list_head stream_list; | |
579 | }; | |
1da177e4 LT |
580 | |
581 | /* This field is used by chunks that hold fragmented data. | |
582 | * For the first fragment this is the list that holds the rest of | |
583 | * fragments. For the remaining fragments, this is the link to the | |
584 | * frag_list maintained in the first fragment. | |
585 | */ | |
586 | struct list_head frag_list; | |
587 | ||
588 | /* This points to the sk_buff containing the actual data. */ | |
589 | struct sk_buff *skb; | |
590 | ||
1b1e0bc9 XL |
591 | union { |
592 | /* In case of GSO packets, this will store the head one */ | |
593 | struct sk_buff *head_skb; | |
594 | /* In case of auth enabled, this will point to the shkey */ | |
595 | struct sctp_shared_key *shkey; | |
596 | }; | |
90017acc | 597 | |
1da177e4 LT |
598 | /* These are the SCTP headers by reverse order in a packet. |
599 | * Note that some of these may happen more than once. In that | |
600 | * case, we point at the "current" one, whatever that means | |
601 | * for that level of header. | |
602 | */ | |
603 | ||
604 | /* We point this at the FIRST TLV parameter to chunk_hdr. */ | |
605 | union sctp_params param_hdr; | |
606 | union { | |
607 | __u8 *v; | |
608 | struct sctp_datahdr *data_hdr; | |
609 | struct sctp_inithdr *init_hdr; | |
610 | struct sctp_sackhdr *sack_hdr; | |
611 | struct sctp_heartbeathdr *hb_hdr; | |
612 | struct sctp_sender_hb_info *hbs_hdr; | |
613 | struct sctp_shutdownhdr *shutdown_hdr; | |
614 | struct sctp_signed_cookie *cookie_hdr; | |
615 | struct sctp_ecnehdr *ecne_hdr; | |
616 | struct sctp_cwrhdr *ecn_cwr_hdr; | |
617 | struct sctp_errhdr *err_hdr; | |
618 | struct sctp_addiphdr *addip_hdr; | |
619 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; | |
1f485649 | 620 | struct sctp_authhdr *auth_hdr; |
ad05a7a0 | 621 | struct sctp_idatahdr *idata_hdr; |
2d07a49a | 622 | struct sctp_ifwdtsn_hdr *ifwdtsn_hdr; |
1da177e4 LT |
623 | } subh; |
624 | ||
625 | __u8 *chunk_end; | |
626 | ||
627 | struct sctp_chunkhdr *chunk_hdr; | |
628 | struct sctphdr *sctp_hdr; | |
629 | ||
630 | /* This needs to be recoverable for SCTP_SEND_FAILED events. */ | |
631 | struct sctp_sndrcvinfo sinfo; | |
632 | ||
633 | /* Which association does this belong to? */ | |
634 | struct sctp_association *asoc; | |
635 | ||
636 | /* What endpoint received this chunk? */ | |
637 | struct sctp_ep_common *rcvr; | |
638 | ||
639 | /* We fill this in if we are calculating RTT. */ | |
640 | unsigned long sent_at; | |
641 | ||
642 | /* What is the origin IP address for this chunk? */ | |
643 | union sctp_addr source; | |
644 | /* Destination address for this chunk. */ | |
645 | union sctp_addr dest; | |
646 | ||
647 | /* For outbound message, track all fragments for SEND_FAILED. */ | |
648 | struct sctp_datamsg *msg; | |
649 | ||
650 | /* For an inbound chunk, this tells us where it came from. | |
651 | * For an outbound chunk, it tells us where we'd like it to | |
652 | * go. It is NULL if we have no preference. | |
653 | */ | |
654 | struct sctp_transport *transport; | |
655 | ||
bbd0d598 VY |
656 | /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO |
657 | * we need save a pointer to the AUTH chunk, since the SCTP-AUTH | |
658 | * spec violates the principle premis that all chunks are processed | |
659 | * in order. | |
660 | */ | |
661 | struct sk_buff *auth_chunk; | |
662 | ||
c226ef9b NH |
663 | #define SCTP_CAN_FRTX 0x0 |
664 | #define SCTP_NEED_FRTX 0x1 | |
665 | #define SCTP_DONT_FRTX 0x2 | |
666 | __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ | |
c226ef9b NH |
667 | has_tsn:1, /* Does this chunk have a TSN yet? */ |
668 | has_ssn:1, /* Does this chunk have a SSN yet? */ | |
668c9beb | 669 | #define has_mid has_ssn |
c226ef9b NH |
670 | singleton:1, /* Only chunk in the packet? */ |
671 | end_of_packet:1, /* Last chunk in the packet? */ | |
672 | ecn_ce_done:1, /* Have we processed the ECN CE bit? */ | |
673 | pdiscard:1, /* Discard the whole packet now? */ | |
674 | tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ | |
675 | data_accepted:1, /* At least 1 chunk accepted */ | |
676 | auth:1, /* IN: was auth'ed | OUT: needs auth */ | |
677 | has_asconf:1, /* IN: have seen an asconf before */ | |
678 | tsn_missing_report:2, /* Data chunk missing counter. */ | |
679 | fast_retransmit:2; /* Is this chunk fast retransmitted? */ | |
1da177e4 LT |
680 | }; |
681 | ||
cc6ac9bc | 682 | #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1) |
1da177e4 LT |
683 | void sctp_chunk_hold(struct sctp_chunk *); |
684 | void sctp_chunk_put(struct sctp_chunk *); | |
e0eb093e AV |
685 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, |
686 | struct iov_iter *from); | |
1da177e4 LT |
687 | void sctp_chunk_free(struct sctp_chunk *); |
688 | void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); | |
689 | struct sctp_chunk *sctp_chunkify(struct sk_buff *, | |
690 | const struct sctp_association *, | |
cea8768f | 691 | struct sock *, gfp_t gfp); |
1da177e4 LT |
692 | void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, |
693 | union sctp_addr *); | |
694 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); | |
695 | ||
2fc019f7 MRL |
696 | static inline __u16 sctp_chunk_stream_no(struct sctp_chunk *ch) |
697 | { | |
698 | return ntohs(ch->subh.data_hdr->stream); | |
699 | } | |
700 | ||
f57d96b2 VY |
701 | enum { |
702 | SCTP_ADDR_NEW, /* new address added to assoc/ep */ | |
703 | SCTP_ADDR_SRC, /* address can be used as source */ | |
704 | SCTP_ADDR_DEL, /* address about to be deleted */ | |
705 | }; | |
706 | ||
1da177e4 | 707 | /* This is a structure for holding either an IPv6 or an IPv4 address. */ |
1da177e4 LT |
708 | struct sctp_sockaddr_entry { |
709 | struct list_head list; | |
29303547 | 710 | struct rcu_head rcu; |
1da177e4 | 711 | union sctp_addr a; |
f57d96b2 | 712 | __u8 state; |
29303547 | 713 | __u8 valid; |
1da177e4 LT |
714 | }; |
715 | ||
9f7d653b MH |
716 | #define SCTP_ADDRESS_TICK_DELAY 500 |
717 | ||
1da177e4 LT |
718 | /* This structure holds lists of chunks as we are assembling for |
719 | * transmission. | |
720 | */ | |
721 | struct sctp_packet { | |
722 | /* These are the SCTP header values (host order) for the packet. */ | |
723 | __u16 source_port; | |
724 | __u16 destination_port; | |
725 | __u32 vtag; | |
726 | ||
727 | /* This contains the payload chunks. */ | |
79af02c2 | 728 | struct list_head chunk_list; |
1da177e4 LT |
729 | |
730 | /* This is the overhead of the sctp and ip headers. */ | |
731 | size_t overhead; | |
732 | /* This is the total size of all chunks INCLUDING padding. */ | |
733 | size_t size; | |
90017acc MRL |
734 | /* This is the maximum size this packet may have */ |
735 | size_t max_size; | |
1da177e4 LT |
736 | |
737 | /* The packet is destined for this transport address. | |
738 | * The function we finally use to pass down to the next lower | |
739 | * layer lives in the transport structure. | |
740 | */ | |
741 | struct sctp_transport *transport; | |
742 | ||
1f485649 VY |
743 | /* pointer to the auth chunk for this packet */ |
744 | struct sctp_chunk *auth; | |
745 | ||
a803c942 VY |
746 | u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ |
747 | has_sack:1, /* This packet contains a SACK chunk. */ | |
748 | has_auth:1, /* This packet contains an AUTH chunk */ | |
749 | has_data:1, /* This packet contains at least 1 DATA chunk */ | |
3e3251b3 | 750 | ipfragok:1; /* So let ip fragment this packet */ |
1da177e4 LT |
751 | }; |
752 | ||
66b91d2c MRL |
753 | void sctp_packet_init(struct sctp_packet *, struct sctp_transport *, |
754 | __u16 sport, __u16 dport); | |
755 | void sctp_packet_config(struct sctp_packet *, __u32 vtag, int); | |
86b36f2a XL |
756 | enum sctp_xmit sctp_packet_transmit_chunk(struct sctp_packet *packet, |
757 | struct sctp_chunk *chunk, | |
758 | int one_packet, gfp_t gfp); | |
759 | enum sctp_xmit sctp_packet_append_chunk(struct sctp_packet *packet, | |
760 | struct sctp_chunk *chunk); | |
cea8768f | 761 | int sctp_packet_transmit(struct sctp_packet *, gfp_t); |
1da177e4 LT |
762 | void sctp_packet_free(struct sctp_packet *); |
763 | ||
764 | static inline int sctp_packet_empty(struct sctp_packet *packet) | |
765 | { | |
a02cec21 | 766 | return packet->size == packet->overhead; |
1da177e4 LT |
767 | } |
768 | ||
769 | /* This represents a remote transport address. | |
770 | * For local transport addresses, we just use union sctp_addr. | |
771 | * | |
772 | * RFC2960 Section 1.4 Key Terms | |
773 | * | |
774 | * o Transport address: A Transport Address is traditionally defined | |
775 | * by Network Layer address, Transport Layer protocol and Transport | |
776 | * Layer port number. In the case of SCTP running over IP, a | |
777 | * transport address is defined by the combination of an IP address | |
778 | * and an SCTP port number (where SCTP is the Transport protocol). | |
779 | * | |
780 | * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control | |
781 | * | |
782 | * o The sender keeps a separate congestion control parameter set for | |
783 | * each of the destination addresses it can send to (not each | |
784 | * source-destination pair but for each destination). The parameters | |
785 | * should decay if the address is not used for a long enough time | |
786 | * period. | |
787 | * | |
788 | */ | |
789 | struct sctp_transport { | |
790 | /* A list of transports. */ | |
791 | struct list_head transports; | |
7fda702f | 792 | struct rhlist_head node; |
1da177e4 LT |
793 | |
794 | /* Reference counting. */ | |
a4b2b58e | 795 | refcount_t refcnt; |
c0058a35 VY |
796 | /* RTO-Pending : A flag used to track if one of the DATA |
797 | * chunks sent to this address is currently being | |
798 | * used to compute a RTT. If this flag is 0, | |
799 | * the next DATA chunk sent to this destination | |
800 | * should be used to compute a RTT and this flag | |
801 | * should be set. Every time the RTT | |
802 | * calculation completes (i.e. the DATA chunk | |
803 | * is SACK'd) clear this flag. | |
804 | */ | |
47faa1e4 | 805 | __u32 rto_pending:1, |
c0058a35 VY |
806 | |
807 | /* | |
808 | * hb_sent : a flag that signals that we have a pending | |
809 | * heartbeat. | |
810 | */ | |
811 | hb_sent:1, | |
812 | ||
c0058a35 | 813 | /* Is the Path MTU update pending on this tranport */ |
38ee8fb6 | 814 | pmtu_pending:1, |
c0058a35 | 815 | |
1f904495 XL |
816 | dst_pending_confirm:1, /* need to confirm neighbour */ |
817 | ||
38ee8fb6 MRL |
818 | /* Has this transport moved the ctsn since we last sacked */ |
819 | sack_generation:1; | |
5a139296 | 820 | u32 dst_cookie; |
4244854d | 821 | |
8663c938 | 822 | struct flowi fl; |
1da177e4 LT |
823 | |
824 | /* This is the peer's IP address and port. */ | |
825 | union sctp_addr ipaddr; | |
826 | ||
827 | /* These are the functions we call to handle LLP stuff. */ | |
828 | struct sctp_af *af_specific; | |
829 | ||
830 | /* Which association do we belong to? */ | |
831 | struct sctp_association *asoc; | |
832 | ||
833 | /* RFC2960 | |
834 | * | |
835 | * 12.3 Per Transport Address Data | |
836 | * | |
837 | * For each destination transport address in the peer's | |
838 | * address list derived from the INIT or INIT ACK chunk, a | |
839 | * number of data elements needs to be maintained including: | |
840 | */ | |
1da177e4 | 841 | /* RTO : The current retransmission timeout value. */ |
8116ffad | 842 | unsigned long rto; |
b6157d8e VY |
843 | |
844 | __u32 rtt; /* This is the most recent RTT. */ | |
1da177e4 LT |
845 | |
846 | /* RTTVAR : The current RTT variation. */ | |
847 | __u32 rttvar; | |
848 | ||
849 | /* SRTT : The current smoothed round trip time. */ | |
850 | __u32 srtt; | |
851 | ||
1da177e4 LT |
852 | /* |
853 | * These are the congestion stats. | |
854 | */ | |
855 | /* cwnd : The current congestion window. */ | |
856 | __u32 cwnd; /* This is the actual cwnd. */ | |
857 | ||
858 | /* ssthresh : The current slow start threshold value. */ | |
859 | __u32 ssthresh; | |
860 | ||
861 | /* partial : The tracking method for increase of cwnd when in | |
862 | * bytes acked : congestion avoidance mode (see Section 6.2.2) | |
863 | */ | |
864 | __u32 partial_bytes_acked; | |
865 | ||
866 | /* Data that has been sent, but not acknowledged. */ | |
867 | __u32 flight_size; | |
868 | ||
46d5a808 VY |
869 | __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ |
870 | ||
1da177e4 LT |
871 | /* Destination */ |
872 | struct dst_entry *dst; | |
873 | /* Source address. */ | |
874 | union sctp_addr saddr; | |
875 | ||
1da177e4 LT |
876 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
877 | * the destination address every heartbeat interval. | |
878 | */ | |
8116ffad | 879 | unsigned long hbinterval; |
52ccb8e9 FF |
880 | |
881 | /* SACK delay timeout */ | |
8116ffad | 882 | unsigned long sackdelay; |
d364d927 | 883 | __u32 sackfreq; |
1da177e4 | 884 | |
d805397c XL |
885 | atomic_t mtu_info; |
886 | ||
e575235f DB |
887 | /* When was the last time that we heard from this transport? We use |
888 | * this to pick new active and retran paths. | |
1da177e4 | 889 | */ |
e575235f | 890 | ktime_t last_time_heard; |
1da177e4 | 891 | |
ba6f5e33 MRL |
892 | /* When was the last time that we sent a chunk using this |
893 | * transport? We use this to check for idle transports | |
894 | */ | |
895 | unsigned long last_time_sent; | |
896 | ||
1da177e4 LT |
897 | /* Last time(in jiffies) when cwnd is reduced due to the congestion |
898 | * indication based on ECNE chunk. | |
899 | */ | |
900 | unsigned long last_time_ecne_reduced; | |
901 | ||
8116ffad VY |
902 | /* This is the max_retrans value for the transport and will |
903 | * be initialized from the assocs value. This can be changed | |
5aa93bcf | 904 | * using the SCTP_SET_PEER_ADDR_PARAMS socket option. |
8116ffad VY |
905 | */ |
906 | __u16 pathmaxrxt; | |
907 | ||
8a9c58d2 XL |
908 | __u32 flowlabel; |
909 | __u8 dscp; | |
910 | ||
5aa93bcf NH |
911 | /* This is the partially failed retrans value for the transport |
912 | * and will be initialized from the assocs value. This can be changed | |
913 | * using the SCTP_PEER_ADDR_THLDS socket option | |
914 | */ | |
915 | int pf_retrans; | |
8116ffad VY |
916 | /* PMTU : The current known path MTU. */ |
917 | __u32 pathmtu; | |
918 | ||
f4ab2f72 | 919 | /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
8116ffad VY |
920 | __u32 param_flags; |
921 | ||
3f7a87d2 FF |
922 | /* The number of times INIT has been sent on this transport. */ |
923 | int init_sent_count; | |
924 | ||
925 | /* state : The current state of this destination, | |
af901ca1 | 926 | * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. |
1da177e4 | 927 | */ |
3f7a87d2 | 928 | int state; |
1da177e4 | 929 | |
1da177e4 LT |
930 | /* These are the error stats for this destination. */ |
931 | ||
932 | /* Error count : The current error count for this destination. */ | |
933 | unsigned short error_count; | |
934 | ||
1da177e4 LT |
935 | /* Per : A timer used by each destination. |
936 | * Destination : | |
937 | * Timer : | |
938 | * | |
939 | * [Everywhere else in the text this is called T3-rtx. -ed] | |
940 | */ | |
941 | struct timer_list T3_rtx_timer; | |
942 | ||
943 | /* Heartbeat timer is per destination. */ | |
944 | struct timer_list hb_timer; | |
945 | ||
50b5d6ad VY |
946 | /* Timer to handle ICMP proto unreachable envets */ |
947 | struct timer_list proto_unreach_timer; | |
948 | ||
7b9438de XL |
949 | /* Timer to handler reconf chunk rtx */ |
950 | struct timer_list reconf_timer; | |
951 | ||
1da177e4 LT |
952 | /* Since we're using per-destination retransmission timers |
953 | * (see above), we're also using per-destination "transmitted" | |
954 | * queues. This probably ought to be a private struct | |
955 | * accessible only within the outqueue, but it's not, yet. | |
956 | */ | |
957 | struct list_head transmitted; | |
958 | ||
959 | /* We build bundle-able packets for this transport here. */ | |
960 | struct sctp_packet packet; | |
961 | ||
962 | /* This is the list of transports that have chunks to send. */ | |
963 | struct list_head send_ready; | |
964 | ||
1da177e4 LT |
965 | /* State information saved for SFR_CACC algorithm. The key |
966 | * idea in SFR_CACC is to maintain state at the sender on a | |
967 | * per-destination basis when a changeover happens. | |
968 | * char changeover_active; | |
969 | * char cycling_changeover; | |
970 | * __u32 next_tsn_at_change; | |
971 | * char cacc_saw_newack; | |
972 | */ | |
973 | struct { | |
974 | /* An unsigned integer, which stores the next TSN to be | |
975 | * used by the sender, at the moment of changeover. | |
976 | */ | |
977 | __u32 next_tsn_at_change; | |
978 | ||
979 | /* A flag which indicates the occurrence of a changeover */ | |
980 | char changeover_active; | |
981 | ||
982 | /* A flag which indicates whether the change of primary is | |
983 | * the first switch to this destination address during an | |
984 | * active switch. | |
985 | */ | |
986 | char cycling_changeover; | |
987 | ||
988 | /* A temporary flag, which is used during the processing of | |
989 | * a SACK to estimate the causative TSN(s)'s group. | |
990 | */ | |
991 | char cacc_saw_newack; | |
992 | } cacc; | |
ad8fec17 SS |
993 | |
994 | /* 64-bit random number sent with heartbeat. */ | |
995 | __u64 hb_nonce; | |
45122ca2 TG |
996 | |
997 | struct rcu_head rcu; | |
1da177e4 LT |
998 | }; |
999 | ||
89bf3450 | 1000 | struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, |
dd0fc66f | 1001 | gfp_t); |
1da177e4 LT |
1002 | void sctp_transport_set_owner(struct sctp_transport *, |
1003 | struct sctp_association *); | |
1004 | void sctp_transport_route(struct sctp_transport *, union sctp_addr *, | |
1005 | struct sctp_sock *); | |
9914ae3c | 1006 | void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); |
1da177e4 | 1007 | void sctp_transport_free(struct sctp_transport *); |
ba6f5e33 MRL |
1008 | void sctp_transport_reset_t3_rtx(struct sctp_transport *); |
1009 | void sctp_transport_reset_hb_timer(struct sctp_transport *); | |
7b9438de | 1010 | void sctp_transport_reset_reconf_timer(struct sctp_transport *transport); |
1eed6779 | 1011 | int sctp_transport_hold(struct sctp_transport *); |
1da177e4 LT |
1012 | void sctp_transport_put(struct sctp_transport *); |
1013 | void sctp_transport_update_rto(struct sctp_transport *, __u32); | |
1014 | void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); | |
233e7936 XL |
1015 | void sctp_transport_lower_cwnd(struct sctp_transport *t, |
1016 | enum sctp_lower_cwnd reason); | |
46d5a808 VY |
1017 | void sctp_transport_burst_limited(struct sctp_transport *); |
1018 | void sctp_transport_burst_reset(struct sctp_transport *); | |
1da177e4 | 1019 | unsigned long sctp_transport_timeout(struct sctp_transport *); |
3ebfdf08 | 1020 | void sctp_transport_reset(struct sctp_transport *t); |
b6c5734d | 1021 | bool sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu); |
ddc4bbee | 1022 | void sctp_transport_immediate_rtx(struct sctp_transport *); |
c86a773c JA |
1023 | void sctp_transport_dst_release(struct sctp_transport *t); |
1024 | void sctp_transport_dst_confirm(struct sctp_transport *t); | |
1da177e4 LT |
1025 | |
1026 | ||
1027 | /* This is the structure we use to queue packets as they come into | |
1028 | * SCTP. We write packets to it and read chunks from it. | |
1029 | */ | |
1030 | struct sctp_inq { | |
1031 | /* This is actually a queue of sctp_chunk each | |
1032 | * containing a partially decoded packet. | |
1033 | */ | |
79af02c2 | 1034 | struct list_head in_chunk_list; |
1da177e4 LT |
1035 | /* This is the packet which is currently off the in queue and is |
1036 | * being worked on through the inbound chunk processing. | |
1037 | */ | |
1038 | struct sctp_chunk *in_progress; | |
1039 | ||
1040 | /* This is the delayed task to finish delivering inbound | |
1041 | * messages. | |
1042 | */ | |
1043 | struct work_struct immediate; | |
1da177e4 LT |
1044 | }; |
1045 | ||
1046 | void sctp_inq_init(struct sctp_inq *); | |
1047 | void sctp_inq_free(struct sctp_inq *); | |
1048 | void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); | |
1049 | struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); | |
bbd0d598 | 1050 | struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); |
c4028958 | 1051 | void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); |
1da177e4 LT |
1052 | |
1053 | /* This is the structure we use to hold outbound chunks. You push | |
1054 | * chunks in and they automatically pop out the other end as bundled | |
1055 | * packets (it calls (*output_handler)()). | |
1056 | * | |
1057 | * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, | |
1058 | * and 8.2 of the v13 draft. | |
1059 | * | |
1060 | * It handles retransmissions. The connection to the timeout portion | |
1061 | * of the state machine is through sctp_..._timeout() and timeout_handler. | |
1062 | * | |
1063 | * If you feed it SACKs, it will eat them. | |
1064 | * | |
1065 | * If you give it big chunks, it will fragment them. | |
1066 | * | |
1067 | * It assigns TSN's to data chunks. This happens at the last possible | |
1068 | * instant before transmission. | |
1069 | * | |
1070 | * When free()'d, it empties itself out via output_handler(). | |
1071 | */ | |
1072 | struct sctp_outq { | |
1073 | struct sctp_association *asoc; | |
1074 | ||
1075 | /* Data pending that has never been transmitted. */ | |
79af02c2 | 1076 | struct list_head out_chunk_list; |
1da177e4 | 1077 | |
5bbbbe32 MRL |
1078 | /* Stream scheduler being used */ |
1079 | struct sctp_sched_ops *sched; | |
1080 | ||
95c96174 | 1081 | unsigned int out_qlen; /* Total length of queued data chunks. */ |
1da177e4 LT |
1082 | |
1083 | /* Error of send failed, may used in SCTP_SEND_FAILED event. */ | |
95c96174 | 1084 | unsigned int error; |
1da177e4 LT |
1085 | |
1086 | /* These are control chunks we want to send. */ | |
79af02c2 | 1087 | struct list_head control_chunk_list; |
1da177e4 LT |
1088 | |
1089 | /* These are chunks that have been sacked but are above the | |
1090 | * CTSN, or cumulative tsn ack point. | |
1091 | */ | |
1092 | struct list_head sacked; | |
1093 | ||
1094 | /* Put chunks on this list to schedule them for | |
1095 | * retransmission. | |
1096 | */ | |
1097 | struct list_head retransmit; | |
1098 | ||
1099 | /* Put chunks on this list to save them for FWD TSN processing as | |
1100 | * they were abandoned. | |
1101 | */ | |
1102 | struct list_head abandoned; | |
1103 | ||
1104 | /* How many unackd bytes do we have in-flight? */ | |
1105 | __u32 outstanding_bytes; | |
1106 | ||
62aeaff5 VY |
1107 | /* Are we doing fast-rtx on this queue */ |
1108 | char fast_rtx; | |
1109 | ||
1da177e4 LT |
1110 | /* Corked? */ |
1111 | char cork; | |
1da177e4 LT |
1112 | }; |
1113 | ||
1114 | void sctp_outq_init(struct sctp_association *, struct sctp_outq *); | |
1115 | void sctp_outq_teardown(struct sctp_outq *); | |
1116 | void sctp_outq_free(struct sctp_outq*); | |
83dbc3d4 | 1117 | void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); |
edfee033 | 1118 | int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); |
1da177e4 LT |
1119 | int sctp_outq_is_empty(const struct sctp_outq *); |
1120 | void sctp_outq_restart(struct sctp_outq *); | |
1121 | ||
125c2982 XL |
1122 | void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport, |
1123 | enum sctp_retransmit_reason reason); | |
1da177e4 | 1124 | void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); |
83dbc3d4 | 1125 | void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); |
8dbdf1f5 XL |
1126 | void sctp_prsctp_prune(struct sctp_association *asoc, |
1127 | struct sctp_sndrcvinfo *sinfo, int msg_len); | |
8e0c3b73 | 1128 | void sctp_generate_fwdtsn(struct sctp_outq *q, __u32 sack_ctsn); |
1da177e4 LT |
1129 | /* Uncork and flush an outqueue. */ |
1130 | static inline void sctp_outq_cork(struct sctp_outq *q) | |
1131 | { | |
1132 | q->cork = 1; | |
1133 | } | |
1134 | ||
9e238323 MRL |
1135 | /* SCTP skb control block. |
1136 | * sctp_input_cb is currently used on rx and sock rx queue | |
1137 | */ | |
1138 | struct sctp_input_cb { | |
1139 | union { | |
1140 | struct inet_skb_parm h4; | |
1141 | #if IS_ENABLED(CONFIG_IPV6) | |
1142 | struct inet6_skb_parm h6; | |
1143 | #endif | |
1144 | } header; | |
1145 | struct sctp_chunk *chunk; | |
e7487c86 | 1146 | struct sctp_af *af; |
9e238323 MRL |
1147 | }; |
1148 | #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) | |
1149 | ||
99519122 XL |
1150 | struct sctp_output_cb { |
1151 | struct sk_buff *last; | |
1152 | }; | |
1153 | #define SCTP_OUTPUT_CB(__skb) ((struct sctp_output_cb *)&((__skb)->cb[0])) | |
1154 | ||
1f45f78f MRL |
1155 | static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) |
1156 | { | |
1157 | const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; | |
1158 | ||
1159 | return chunk->head_skb ? : skb; | |
1160 | } | |
1161 | ||
1da177e4 LT |
1162 | /* These bind address data fields common between endpoints and associations */ |
1163 | struct sctp_bind_addr { | |
1164 | ||
1165 | /* RFC 2960 12.1 Parameters necessary for the SCTP instance | |
1166 | * | |
1167 | * SCTP Port: The local SCTP port number the endpoint is | |
1168 | * bound to. | |
1169 | */ | |
1170 | __u16 port; | |
1171 | ||
1172 | /* RFC 2960 12.1 Parameters necessary for the SCTP instance | |
1173 | * | |
1174 | * Address List: The list of IP addresses that this instance | |
1175 | * has bound. This information is passed to one's | |
1176 | * peer(s) in INIT and INIT ACK chunks. | |
1177 | */ | |
1178 | struct list_head address_list; | |
1da177e4 LT |
1179 | }; |
1180 | ||
1181 | void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); | |
1182 | void sctp_bind_addr_free(struct sctp_bind_addr *); | |
4db67e80 | 1183 | int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, |
1da177e4 | 1184 | const struct sctp_bind_addr *src, |
1c662018 | 1185 | enum sctp_scope scope, gfp_t gfp, |
3182cd84 | 1186 | int flags); |
8e71a11c VY |
1187 | int sctp_bind_addr_dup(struct sctp_bind_addr *dest, |
1188 | const struct sctp_bind_addr *src, | |
1189 | gfp_t gfp); | |
1da177e4 | 1190 | int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, |
133800d1 | 1191 | int new_size, __u8 addr_state, gfp_t gfp); |
0ed90fb0 | 1192 | int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); |
1da177e4 LT |
1193 | int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, |
1194 | struct sctp_sock *); | |
7dab83de VY |
1195 | int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, |
1196 | struct sctp_sock *, struct sctp_sock *); | |
75205f47 VY |
1197 | int sctp_bind_addr_state(const struct sctp_bind_addr *bp, |
1198 | const union sctp_addr *addr); | |
76c6d988 XL |
1199 | int sctp_bind_addrs_check(struct sctp_sock *sp, |
1200 | struct sctp_sock *sp2, int cnt2); | |
1da177e4 LT |
1201 | union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, |
1202 | const union sctp_addr *addrs, | |
1203 | int addrcnt, | |
1204 | struct sctp_sock *opt); | |
1205 | union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, | |
3182cd84 | 1206 | int *addrs_len, |
dd0fc66f | 1207 | gfp_t gfp); |
1da177e4 | 1208 | int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, |
dd0fc66f | 1209 | __u16 port, gfp_t gfp); |
1da177e4 | 1210 | |
1c662018 XL |
1211 | enum sctp_scope sctp_scope(const union sctp_addr *addr); |
1212 | int sctp_in_scope(struct net *net, const union sctp_addr *addr, | |
1213 | const enum sctp_scope scope); | |
52cae8f0 | 1214 | int sctp_is_any(struct sock *sk, const union sctp_addr *addr); |
9f7d653b | 1215 | int sctp_is_ep_boundall(struct sock *sk); |
1da177e4 LT |
1216 | |
1217 | ||
1218 | /* What type of endpoint? */ | |
74439f34 | 1219 | enum sctp_endpoint_type { |
1da177e4 LT |
1220 | SCTP_EP_TYPE_SOCKET, |
1221 | SCTP_EP_TYPE_ASSOCIATION, | |
74439f34 | 1222 | }; |
1da177e4 LT |
1223 | |
1224 | /* | |
1225 | * A common base class to bridge the implmentation view of a | |
1226 | * socket (usually listening) endpoint versus an association's | |
1227 | * local endpoint. | |
1228 | * This common structure is useful for several purposes: | |
1229 | * 1) Common interface for lookup routines. | |
1230 | * a) Subfunctions work for either endpoint or association | |
1231 | * b) Single interface to lookup allows hiding the lookup lock rather | |
1232 | * than acquiring it externally. | |
1233 | * 2) Common interface for the inbound chunk handling/state machine. | |
1234 | * 3) Common object handling routines for reference counting, etc. | |
1235 | * 4) Disentangle association lookup from endpoint lookup, where we | |
1236 | * do not have to find our endpoint to find our association. | |
1237 | * | |
1238 | */ | |
1239 | ||
1240 | struct sctp_ep_common { | |
1241 | /* Fields to help us manage our entries in the hash tables. */ | |
d970dbf8 | 1242 | struct hlist_node node; |
1da177e4 LT |
1243 | int hashent; |
1244 | ||
1245 | /* Runtime type information. What kind of endpoint is this? */ | |
74439f34 | 1246 | enum sctp_endpoint_type type; |
1da177e4 LT |
1247 | |
1248 | /* Some fields to help us manage this object. | |
1249 | * refcnt - Reference count access to this object. | |
1250 | * dead - Do not attempt to use this object. | |
1da177e4 | 1251 | */ |
c638457a | 1252 | refcount_t refcnt; |
0022d2dd | 1253 | bool dead; |
1da177e4 LT |
1254 | |
1255 | /* What socket does this endpoint belong to? */ | |
1256 | struct sock *sk; | |
1257 | ||
1258 | /* This is where we receive inbound chunks. */ | |
1259 | struct sctp_inq inqueue; | |
1260 | ||
1261 | /* This substructure includes the defining parameters of the | |
1262 | * endpoint: | |
1263 | * bind_addr.port is our shared port number. | |
1264 | * bind_addr.address_list is our set of local IP addresses. | |
1265 | */ | |
1266 | struct sctp_bind_addr bind_addr; | |
1da177e4 LT |
1267 | }; |
1268 | ||
1269 | ||
1270 | /* RFC Section 1.4 Key Terms | |
1271 | * | |
1272 | * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a | |
1273 | * multi-homed host, an SCTP endpoint is represented to its peers as a | |
1274 | * combination of a set of eligible destination transport addresses to | |
1275 | * which SCTP packets can be sent and a set of eligible source | |
1276 | * transport addresses from which SCTP packets can be received. | |
1277 | * All transport addresses used by an SCTP endpoint must use the | |
1278 | * same port number, but can use multiple IP addresses. A transport | |
1279 | * address used by an SCTP endpoint must not be used by another | |
1280 | * SCTP endpoint. In other words, a transport address is unique | |
1281 | * to an SCTP endpoint. | |
1282 | * | |
1283 | * From an implementation perspective, each socket has one of these. | |
1284 | * A TCP-style socket will have exactly one association on one of | |
1285 | * these. An UDP-style socket will have multiple associations hanging | |
1286 | * off one of these. | |
1287 | */ | |
1288 | ||
1289 | struct sctp_endpoint { | |
1290 | /* Common substructure for endpoint and association. */ | |
1291 | struct sctp_ep_common base; | |
1292 | ||
1293 | /* Associations: A list of current associations and mappings | |
1294 | * to the data consumers for each association. This | |
1295 | * may be in the form of a hash table or other | |
1296 | * implementation dependent structure. The data | |
1297 | * consumers may be process identification | |
1298 | * information such as file descriptors, named pipe | |
1299 | * pointer, or table pointers dependent on how SCTP | |
1300 | * is implemented. | |
1301 | */ | |
1302 | /* This is really a list of struct sctp_association entries. */ | |
1303 | struct list_head asocs; | |
1304 | ||
1305 | /* Secret Key: A secret key used by this endpoint to compute | |
1306 | * the MAC. This SHOULD be a cryptographic quality | |
1307 | * random number with a sufficient length. | |
1308 | * Discussion in [RFC1750] can be helpful in | |
1309 | * selection of the key. | |
1310 | */ | |
570617e7 | 1311 | __u8 secret_key[SCTP_SECRET_SIZE]; |
1da177e4 | 1312 | |
313e7b4d VY |
1313 | /* digest: This is a digest of the sctp cookie. This field is |
1314 | * only used on the receive path when we try to validate | |
1315 | * that the cookie has not been tampered with. We put | |
1316 | * this here so we pre-allocate this once and can re-use | |
1317 | * on every receive. | |
1318 | */ | |
b68dbcab | 1319 | __u8 *digest; |
313e7b4d | 1320 | |
4eb701df NH |
1321 | /* sendbuf acct. policy. */ |
1322 | __u32 sndbuf_policy; | |
049b3ff5 NH |
1323 | |
1324 | /* rcvbuf acct. policy. */ | |
1325 | __u32 rcvbuf_policy; | |
1f485649 VY |
1326 | |
1327 | /* SCTP AUTH: array of the HMACs that will be allocated | |
1328 | * we need this per association so that we don't serialize | |
1329 | */ | |
5821c769 | 1330 | struct crypto_shash **auth_hmacs; |
1f485649 VY |
1331 | |
1332 | /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ | |
1333 | struct sctp_hmac_algo_param *auth_hmacs_list; | |
1334 | ||
1335 | /* SCTP-AUTH: chunks to authenticate encoded into parameter */ | |
1336 | struct sctp_chunks_param *auth_chunk_list; | |
1337 | ||
1338 | /* SCTP-AUTH: endpoint shared keys */ | |
1339 | struct list_head endpoint_shared_keys; | |
1340 | __u16 active_key_id; | |
28aa4c26 | 1341 | __u8 auth_enable:1, |
c28445c3 XL |
1342 | prsctp_enable:1, |
1343 | reconf_enable:1; | |
9fb657ae XL |
1344 | |
1345 | __u8 strreset_enable; | |
2277c7cd RH |
1346 | |
1347 | /* Security identifiers from incoming (INIT). These are set by | |
1348 | * security_sctp_assoc_request(). These will only be used by | |
1349 | * SCTP TCP type sockets and peeled off connections as they | |
1350 | * cause a new socket to be generated. security_sctp_sk_clone() | |
1351 | * will then plug these into the new socket. | |
1352 | */ | |
1353 | ||
1354 | u32 secid; | |
1355 | u32 peer_secid; | |
1da177e4 LT |
1356 | }; |
1357 | ||
1358 | /* Recover the outter endpoint structure. */ | |
1359 | static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) | |
1360 | { | |
1361 | struct sctp_endpoint *ep; | |
1362 | ||
1363 | ep = container_of(base, struct sctp_endpoint, base); | |
1364 | return ep; | |
1365 | } | |
1366 | ||
1367 | /* These are function signatures for manipulating endpoints. */ | |
dd0fc66f | 1368 | struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); |
1da177e4 LT |
1369 | void sctp_endpoint_free(struct sctp_endpoint *); |
1370 | void sctp_endpoint_put(struct sctp_endpoint *); | |
1371 | void sctp_endpoint_hold(struct sctp_endpoint *); | |
1372 | void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); | |
1373 | struct sctp_association *sctp_endpoint_lookup_assoc( | |
1374 | const struct sctp_endpoint *ep, | |
1375 | const union sctp_addr *paddr, | |
1376 | struct sctp_transport **); | |
53066538 XL |
1377 | bool sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep, |
1378 | const union sctp_addr *paddr); | |
1da177e4 | 1379 | struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, |
4cdadcbc | 1380 | struct net *, const union sctp_addr *); |
53066538 XL |
1381 | bool sctp_has_association(struct net *net, const union sctp_addr *laddr, |
1382 | const union sctp_addr *paddr); | |
1da177e4 | 1383 | |
b14878cc VY |
1384 | int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, |
1385 | const struct sctp_association *asoc, | |
01a992be | 1386 | enum sctp_cid cid, struct sctp_init_chunk *peer_init, |
f53b5b09 | 1387 | struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); |
de6becdc | 1388 | int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, |
1da177e4 | 1389 | const union sctp_addr *peer, |
01a992be | 1390 | struct sctp_init_chunk *init, gfp_t gfp); |
1da177e4 LT |
1391 | __u32 sctp_generate_tag(const struct sctp_endpoint *); |
1392 | __u32 sctp_generate_tsn(const struct sctp_endpoint *); | |
1393 | ||
e1857ea2 AV |
1394 | struct sctp_inithdr_host { |
1395 | __u32 init_tag; | |
1396 | __u32 a_rwnd; | |
1397 | __u16 num_outbound_streams; | |
1398 | __u16 num_inbound_streams; | |
1399 | __u32 initial_tsn; | |
1400 | }; | |
1da177e4 | 1401 | |
637784ad MRL |
1402 | struct sctp_stream_priorities { |
1403 | /* List of priorities scheduled */ | |
1404 | struct list_head prio_sched; | |
1405 | /* List of streams scheduled */ | |
1406 | struct list_head active; | |
1407 | /* The next stream stream in line */ | |
1408 | struct sctp_stream_out_ext *next; | |
1409 | __u16 prio; | |
1410 | }; | |
1411 | ||
f952be79 MRL |
1412 | struct sctp_stream_out_ext { |
1413 | __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; | |
1414 | __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; | |
5bbbbe32 | 1415 | struct list_head outq; /* chunks enqueued by this stream */ |
637784ad MRL |
1416 | union { |
1417 | struct { | |
1418 | /* Scheduled streams list */ | |
1419 | struct list_head prio_list; | |
1420 | struct sctp_stream_priorities *prio_head; | |
1421 | }; | |
ac1ed8b8 MRL |
1422 | /* Fields used by RR scheduler */ |
1423 | struct { | |
1424 | struct list_head rr_list; | |
1425 | }; | |
637784ad | 1426 | }; |
f952be79 MRL |
1427 | }; |
1428 | ||
a8386317 | 1429 | struct sctp_stream_out { |
668c9beb XL |
1430 | union { |
1431 | __u32 mid; | |
1432 | __u16 ssn; | |
1433 | }; | |
13228238 | 1434 | __u32 mid_uo; |
f952be79 | 1435 | struct sctp_stream_out_ext *ext; |
13228238 | 1436 | __u8 state; |
a8386317 XL |
1437 | }; |
1438 | ||
1439 | struct sctp_stream_in { | |
9d4ceaf1 XL |
1440 | union { |
1441 | __u32 mid; | |
1442 | __u16 ssn; | |
1443 | }; | |
13228238 | 1444 | __u32 mid_uo; |
9d4ceaf1 | 1445 | __u32 fsn; |
13228238 | 1446 | __u32 fsn_uo; |
bd4d627d | 1447 | char pd_mode; |
13228238 | 1448 | char pd_mode_uo; |
a8386317 XL |
1449 | }; |
1450 | ||
1451 | struct sctp_stream { | |
0d493b4d KK |
1452 | struct flex_array *out; |
1453 | struct flex_array *in; | |
a8386317 XL |
1454 | __u16 outcnt; |
1455 | __u16 incnt; | |
5bbbbe32 MRL |
1456 | /* Current stream being sent, if any */ |
1457 | struct sctp_stream_out *out_curr; | |
637784ad MRL |
1458 | union { |
1459 | /* Fields used by priority scheduler */ | |
1460 | struct { | |
1461 | /* List of priorities scheduled */ | |
1462 | struct list_head prio_list; | |
1463 | }; | |
ac1ed8b8 MRL |
1464 | /* Fields used by RR scheduler */ |
1465 | struct { | |
1466 | /* List of streams scheduled */ | |
1467 | struct list_head rr_list; | |
1468 | /* The next stream stream in line */ | |
1469 | struct sctp_stream_out_ext *rr_next; | |
1470 | }; | |
637784ad | 1471 | }; |
0c3f6f65 | 1472 | struct sctp_stream_interleave *si; |
a8386317 XL |
1473 | }; |
1474 | ||
05364ca0 KK |
1475 | static inline struct sctp_stream_out *sctp_stream_out( |
1476 | const struct sctp_stream *stream, | |
1477 | __u16 sid) | |
1478 | { | |
0d493b4d | 1479 | return flex_array_get(stream->out, sid); |
05364ca0 KK |
1480 | } |
1481 | ||
1482 | static inline struct sctp_stream_in *sctp_stream_in( | |
1483 | const struct sctp_stream *stream, | |
1484 | __u16 sid) | |
1485 | { | |
0d493b4d | 1486 | return flex_array_get(stream->in, sid); |
05364ca0 KK |
1487 | } |
1488 | ||
1489 | #define SCTP_SO(s, i) sctp_stream_out((s), (i)) | |
1490 | #define SCTP_SI(s, i) sctp_stream_in((s), (i)) | |
1491 | ||
a8386317 XL |
1492 | #define SCTP_STREAM_CLOSED 0x00 |
1493 | #define SCTP_STREAM_OPEN 0x01 | |
1494 | ||
0c3f6f65 XL |
1495 | static inline __u16 sctp_datachk_len(const struct sctp_stream *stream) |
1496 | { | |
1497 | return stream->si->data_chunk_len; | |
1498 | } | |
1499 | ||
1500 | static inline __u16 sctp_datahdr_len(const struct sctp_stream *stream) | |
1501 | { | |
1502 | return stream->si->data_chunk_len - sizeof(struct sctp_chunkhdr); | |
1503 | } | |
1504 | ||
0fc2ea92 XL |
1505 | static inline __u16 sctp_ftsnchk_len(const struct sctp_stream *stream) |
1506 | { | |
1507 | return stream->si->ftsn_chunk_len; | |
1508 | } | |
1509 | ||
1510 | static inline __u16 sctp_ftsnhdr_len(const struct sctp_stream *stream) | |
1511 | { | |
1512 | return stream->si->ftsn_chunk_len - sizeof(struct sctp_chunkhdr); | |
1513 | } | |
1514 | ||
196d6759 MB |
1515 | /* SCTP_GET_ASSOC_STATS counters */ |
1516 | struct sctp_priv_assoc_stats { | |
1517 | /* Maximum observed rto in the association during subsequent | |
1518 | * observations. Value is set to 0 if no RTO measurement took place | |
1519 | * The transport where the max_rto was observed is returned in | |
1520 | * obs_rto_ipaddr | |
1521 | */ | |
1522 | struct sockaddr_storage obs_rto_ipaddr; | |
1523 | __u64 max_obs_rto; | |
1524 | /* Total In and Out SACKs received and sent */ | |
1525 | __u64 isacks; | |
1526 | __u64 osacks; | |
1527 | /* Total In and Out packets received and sent */ | |
1528 | __u64 opackets; | |
1529 | __u64 ipackets; | |
1530 | /* Total retransmitted chunks */ | |
1531 | __u64 rtxchunks; | |
1532 | /* TSN received > next expected */ | |
1533 | __u64 outofseqtsns; | |
1534 | /* Duplicate Chunks received */ | |
1535 | __u64 idupchunks; | |
1536 | /* Gap Ack Blocks received */ | |
1537 | __u64 gapcnt; | |
1538 | /* Unordered data chunks sent and received */ | |
1539 | __u64 ouodchunks; | |
1540 | __u64 iuodchunks; | |
1541 | /* Ordered data chunks sent and received */ | |
1542 | __u64 oodchunks; | |
1543 | __u64 iodchunks; | |
1544 | /* Control chunks sent and received */ | |
1545 | __u64 octrlchunks; | |
1546 | __u64 ictrlchunks; | |
1547 | }; | |
1548 | ||
1da177e4 LT |
1549 | /* RFC2960 |
1550 | * | |
1551 | * 12. Recommended Transmission Control Block (TCB) Parameters | |
1552 | * | |
1553 | * This section details a recommended set of parameters that should | |
1554 | * be contained within the TCB for an implementation. This section is | |
1555 | * for illustrative purposes and should not be deemed as requirements | |
1556 | * on an implementation or as an exhaustive list of all parameters | |
1557 | * inside an SCTP TCB. Each implementation may need its own additional | |
1558 | * parameters for optimization. | |
1559 | */ | |
1560 | ||
1561 | ||
1562 | /* Here we have information about each individual association. */ | |
1563 | struct sctp_association { | |
1564 | ||
1565 | /* A base structure common to endpoint and association. | |
1566 | * In this context, it represents the associations's view | |
1567 | * of the local endpoint of the association. | |
1568 | */ | |
1569 | struct sctp_ep_common base; | |
1570 | ||
1571 | /* Associations on the same socket. */ | |
1572 | struct list_head asocs; | |
1573 | ||
1574 | /* association id. */ | |
1575 | sctp_assoc_t assoc_id; | |
1576 | ||
1577 | /* This is our parent endpoint. */ | |
1578 | struct sctp_endpoint *ep; | |
1579 | ||
1580 | /* These are those association elements needed in the cookie. */ | |
1581 | struct sctp_cookie c; | |
1582 | ||
1583 | /* This is all information about our peer. */ | |
1584 | struct { | |
1da177e4 LT |
1585 | /* transport_addr_list |
1586 | * | |
1587 | * Peer : A list of SCTP transport addresses that the | |
1588 | * Transport : peer is bound to. This information is derived | |
1589 | * Address : from the INIT or INIT ACK and is used to | |
1590 | * List : associate an inbound packet with a given | |
1591 | * : association. Normally this information is | |
1592 | * : hashed or keyed for quick lookup and access | |
1593 | * : of the TCB. | |
3f7a87d2 FF |
1594 | * : The list is also initialized with the list |
1595 | * : of addresses passed with the sctp_connectx() | |
1596 | * : call. | |
1da177e4 LT |
1597 | * |
1598 | * It is a list of SCTP_transport's. | |
1599 | */ | |
1600 | struct list_head transport_addr_list; | |
1601 | ||
be78cfcb | 1602 | /* rwnd |
1603 | * | |
1604 | * Peer Rwnd : Current calculated value of the peer's rwnd. | |
1605 | */ | |
1606 | __u32 rwnd; | |
1607 | ||
3f7a87d2 FF |
1608 | /* transport_count |
1609 | * | |
1610 | * Peer : A count of the number of peer addresses | |
1611 | * Transport : in the Peer Transport Address List. | |
1612 | * Address : | |
1613 | * Count : | |
1614 | */ | |
1615 | __u16 transport_count; | |
1616 | ||
1da177e4 LT |
1617 | /* port |
1618 | * The transport layer port number. | |
1619 | */ | |
1620 | __u16 port; | |
1621 | ||
1622 | /* primary_path | |
1623 | * | |
1624 | * Primary : This is the current primary destination | |
1625 | * Path : transport address of the peer endpoint. It | |
1626 | * : may also specify a source transport address | |
1627 | * : on this endpoint. | |
1628 | * | |
1629 | * All of these paths live on transport_addr_list. | |
1630 | * | |
1631 | * At the bakeoffs, we discovered that the intent of | |
1632 | * primaryPath is that it only changes when the ULP | |
1633 | * asks to have it changed. We add the activePath to | |
1634 | * designate the connection we are currently using to | |
1635 | * transmit new data and most control chunks. | |
1636 | */ | |
1637 | struct sctp_transport *primary_path; | |
1638 | ||
1639 | /* Cache the primary path address here, when we | |
1640 | * need a an address for msg_name. | |
1641 | */ | |
1642 | union sctp_addr primary_addr; | |
1643 | ||
1644 | /* active_path | |
1645 | * The path that we are currently using to | |
1646 | * transmit new data and most control chunks. | |
1647 | */ | |
1648 | struct sctp_transport *active_path; | |
1649 | ||
1650 | /* retran_path | |
1651 | * | |
1652 | * RFC2960 6.4 Multi-homed SCTP Endpoints | |
1653 | * ... | |
1654 | * Furthermore, when its peer is multi-homed, an | |
1655 | * endpoint SHOULD try to retransmit a chunk to an | |
1656 | * active destination transport address that is | |
1657 | * different from the last destination address to | |
1658 | * which the DATA chunk was sent. | |
1659 | */ | |
1660 | struct sctp_transport *retran_path; | |
1661 | ||
1662 | /* Pointer to last transport I have sent on. */ | |
1663 | struct sctp_transport *last_sent_to; | |
1664 | ||
1665 | /* This is the last transport I have received DATA on. */ | |
1666 | struct sctp_transport *last_data_from; | |
1667 | ||
1668 | /* | |
1669 | * Mapping An array of bits or bytes indicating which out of | |
1670 | * Array order TSN's have been received (relative to the | |
1671 | * Last Rcvd TSN). If no gaps exist, i.e. no out of | |
1672 | * order packets have been received, this array | |
1673 | * will be set to all zero. This structure may be | |
1674 | * in the form of a circular buffer or bit array. | |
1675 | * | |
1676 | * Last Rcvd : This is the last TSN received in | |
1677 | * TSN : sequence. This value is set initially by | |
1678 | * : taking the peer's Initial TSN, received in | |
1679 | * : the INIT or INIT ACK chunk, and subtracting | |
1680 | * : one from it. | |
1681 | * | |
1682 | * Throughout most of the specification this is called the | |
1683 | * "Cumulative TSN ACK Point". In this case, we | |
1684 | * ignore the advice in 12.2 in favour of the term | |
1685 | * used in the bulk of the text. This value is hidden | |
1686 | * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). | |
1687 | */ | |
1688 | struct sctp_tsnmap tsn_map; | |
1da177e4 | 1689 | |
be78cfcb | 1690 | /* This mask is used to disable sending the ASCONF chunk |
1691 | * with specified parameter to peer. | |
1692 | */ | |
1693 | __be16 addip_disabled_mask; | |
1694 | ||
1695 | /* These are capabilities which our peer advertised. */ | |
1696 | __u8 ecn_capable:1, /* Can peer do ECN? */ | |
1697 | ipv4_address:1, /* Peer understands IPv4 addresses? */ | |
1698 | ipv6_address:1, /* Peer understands IPv6 addresses? */ | |
1699 | hostname_address:1, /* Peer understands DNS addresses? */ | |
1700 | asconf_capable:1, /* Does peer support ADDIP? */ | |
1701 | prsctp_capable:1, /* Can peer do PR-SCTP? */ | |
c28445c3 | 1702 | reconf_capable:1, /* Can peer do RE-CONFIG? */ |
be78cfcb | 1703 | auth_capable:1; /* Is peer doing SCTP-AUTH? */ |
1704 | ||
38ee8fb6 | 1705 | /* sack_needed : This flag indicates if the next received |
1da177e4 | 1706 | * : packet is to be responded to with a |
38ee8fb6 MRL |
1707 | * : SACK. This is initialized to 0. When a packet |
1708 | * : is received sack_cnt is incremented. If this value | |
1da177e4 LT |
1709 | * : reaches 2 or more, a SACK is sent and the |
1710 | * : value is reset to 0. Note: This is used only | |
1711 | * : when no DATA chunks are received out of | |
1712 | * : order. When DATA chunks are out of order, | |
1713 | * : SACK's are not delayed (see Section 6). | |
1714 | */ | |
38ee8fb6 | 1715 | __u8 sack_needed:1, /* Do we need to sack the peer? */ |
8a0d19c5 | 1716 | sack_generation:1, |
1717 | zero_window_announced:1; | |
d364d927 | 1718 | __u32 sack_cnt; |
1da177e4 | 1719 | |
0f3fffd8 | 1720 | __u32 adaptation_ind; /* Adaptation Code point. */ |
1da177e4 | 1721 | |
e1857ea2 | 1722 | struct sctp_inithdr_host i; |
1da177e4 | 1723 | void *cookie; |
be78cfcb | 1724 | int cookie_len; |
1da177e4 LT |
1725 | |
1726 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. | |
1727 | * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the | |
1728 | * Initial TSN Value minus 1 | |
1729 | */ | |
1730 | __u32 addip_serial; | |
1f485649 VY |
1731 | |
1732 | /* SCTP-AUTH: We need to know pears random number, hmac list | |
1733 | * and authenticated chunk list. All that is part of the | |
1734 | * cookie and these are just pointers to those locations | |
1735 | */ | |
b02db702 | 1736 | struct sctp_random_param *peer_random; |
a762a9d9 | 1737 | struct sctp_chunks_param *peer_chunks; |
1474774a | 1738 | struct sctp_hmac_algo_param *peer_hmacs; |
1da177e4 LT |
1739 | } peer; |
1740 | ||
1741 | /* State : A state variable indicating what state the | |
1742 | * : association is in, i.e. COOKIE-WAIT, | |
1743 | * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, | |
1744 | * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. | |
1745 | * | |
1746 | * Note: No "CLOSED" state is illustrated since if a | |
1747 | * association is "CLOSED" its TCB SHOULD be removed. | |
1748 | * | |
1749 | * In this implementation we DO have a CLOSED | |
1750 | * state which is used during initiation and shutdown. | |
1751 | * | |
1752 | * State takes values from SCTP_STATE_*. | |
1753 | */ | |
52106019 | 1754 | enum sctp_state state; |
1da177e4 | 1755 | |
1da177e4 LT |
1756 | /* Overall : The overall association error count. |
1757 | * Error Count : [Clear this any time I get something.] | |
1758 | */ | |
1759 | int overall_error_count; | |
1760 | ||
be78cfcb | 1761 | /* The cookie life I award for any cookie. */ |
1762 | ktime_t cookie_life; | |
1763 | ||
1da177e4 LT |
1764 | /* These are the association's initial, max, and min RTO values. |
1765 | * These values will be initialized by system defaults, but can | |
1766 | * be modified via the SCTP_RTOINFO socket option. | |
1767 | */ | |
8116ffad VY |
1768 | unsigned long rto_initial; |
1769 | unsigned long rto_max; | |
1770 | unsigned long rto_min; | |
1da177e4 LT |
1771 | |
1772 | /* Maximum number of new data packets that can be sent in a burst. */ | |
1773 | int max_burst; | |
1774 | ||
1775 | /* This is the max_retrans value for the association. This value will | |
1776 | * be initialized initialized from system defaults, but can be | |
1777 | * modified by the SCTP_ASSOCINFO socket option. | |
1778 | */ | |
1779 | int max_retrans; | |
1780 | ||
5aa93bcf NH |
1781 | /* This is the partially failed retrans value for the transport |
1782 | * and will be initialized from the assocs value. This can be | |
1783 | * changed using the SCTP_PEER_ADDR_THLDS socket option | |
1784 | */ | |
1785 | int pf_retrans; | |
1786 | ||
1da177e4 LT |
1787 | /* Maximum number of times the endpoint will retransmit INIT */ |
1788 | __u16 max_init_attempts; | |
1789 | ||
1790 | /* How many times have we resent an INIT? */ | |
1791 | __u16 init_retries; | |
1792 | ||
1793 | /* The largest timeout or RTO value to use in attempting an INIT */ | |
8116ffad | 1794 | unsigned long max_init_timeo; |
1da177e4 | 1795 | |
52ccb8e9 FF |
1796 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
1797 | * the destination address every heartbeat interval. This value | |
1798 | * will be inherited by all new transports. | |
1799 | */ | |
8116ffad | 1800 | unsigned long hbinterval; |
52ccb8e9 FF |
1801 | |
1802 | /* This is the max_retrans value for new transports in the | |
1803 | * association. | |
1804 | */ | |
1805 | __u16 pathmaxrxt; | |
1806 | ||
8a9c58d2 XL |
1807 | __u32 flowlabel; |
1808 | __u8 dscp; | |
1809 | ||
8a479491 VY |
1810 | /* Flag that path mtu update is pending */ |
1811 | __u8 pmtu_pending; | |
1812 | ||
52ccb8e9 FF |
1813 | /* Association : The smallest PMTU discovered for all of the |
1814 | * PMTU : peer's transport addresses. | |
1815 | */ | |
1816 | __u32 pathmtu; | |
1817 | ||
f4ab2f72 | 1818 | /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
52ccb8e9 FF |
1819 | __u32 param_flags; |
1820 | ||
be78cfcb | 1821 | __u32 sackfreq; |
8116ffad VY |
1822 | /* SACK delay timeout */ |
1823 | unsigned long sackdelay; | |
8116ffad VY |
1824 | |
1825 | unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; | |
1da177e4 LT |
1826 | struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; |
1827 | ||
1828 | /* Transport to which SHUTDOWN chunk was last sent. */ | |
1829 | struct sctp_transport *shutdown_last_sent_to; | |
1830 | ||
3f7a87d2 FF |
1831 | /* Transport to which INIT chunk was last sent. */ |
1832 | struct sctp_transport *init_last_sent_to; | |
1833 | ||
be78cfcb | 1834 | /* How many times have we resent a SHUTDOWN */ |
1835 | int shutdown_retries; | |
1836 | ||
1da177e4 LT |
1837 | /* Next TSN : The next TSN number to be assigned to a new |
1838 | * : DATA chunk. This is sent in the INIT or INIT | |
1839 | * : ACK chunk to the peer and incremented each | |
1840 | * : time a DATA chunk is assigned a TSN | |
1841 | * : (normally just prior to transmit or during | |
1842 | * : fragmentation). | |
1843 | */ | |
1844 | __u32 next_tsn; | |
1845 | ||
1846 | /* | |
1847 | * Last Rcvd : This is the last TSN received in sequence. This value | |
1848 | * TSN : is set initially by taking the peer's Initial TSN, | |
1849 | * : received in the INIT or INIT ACK chunk, and | |
1850 | * : subtracting one from it. | |
1851 | * | |
1852 | * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. | |
1853 | */ | |
1854 | ||
1855 | __u32 ctsn_ack_point; | |
1856 | ||
1857 | /* PR-SCTP Advanced.Peer.Ack.Point */ | |
1858 | __u32 adv_peer_ack_point; | |
1859 | ||
1860 | /* Highest TSN that is acknowledged by incoming SACKs. */ | |
1861 | __u32 highest_sacked; | |
1862 | ||
cf9b4812 VY |
1863 | /* TSN marking the fast recovery exit point */ |
1864 | __u32 fast_recovery_exit; | |
1865 | ||
1866 | /* Flag to track the current fast recovery state */ | |
1867 | __u8 fast_recovery; | |
1868 | ||
1da177e4 LT |
1869 | /* The number of unacknowledged data chunks. Reported through |
1870 | * the SCTP_STATUS sockopt. | |
1871 | */ | |
1872 | __u16 unack_data; | |
1873 | ||
58fbbed4 NH |
1874 | /* The total number of data chunks that we've had to retransmit |
1875 | * as the result of a T3 timer expiration | |
1876 | */ | |
1877 | __u32 rtx_data_chunks; | |
1878 | ||
1da177e4 LT |
1879 | /* This is the association's receive buffer space. This value is used |
1880 | * to set a_rwnd field in an INIT or a SACK chunk. | |
1881 | */ | |
1882 | __u32 rwnd; | |
1883 | ||
1884 | /* This is the last advertised value of rwnd over a SACK chunk. */ | |
1885 | __u32 a_rwnd; | |
1886 | ||
362d5204 DB |
1887 | /* Number of bytes by which the rwnd has slopped. The rwnd is allowed |
1888 | * to slop over a maximum of the association's frag_point. | |
1889 | */ | |
1890 | __u32 rwnd_over; | |
1891 | ||
1892 | /* Keeps treack of rwnd pressure. This happens when we have | |
1893 | * a window, but not recevie buffer (i.e small packets). This one | |
1894 | * is releases slowly (1 PMTU at a time ). | |
1895 | */ | |
1896 | __u32 rwnd_press; | |
1897 | ||
1da177e4 LT |
1898 | /* This is the sndbuf size in use for the association. |
1899 | * This corresponds to the sndbuf size for the association, | |
1900 | * as specified in the sk->sndbuf. | |
1901 | */ | |
1902 | int sndbuf_used; | |
1903 | ||
049b3ff5 NH |
1904 | /* This is the amount of memory that this association has allocated |
1905 | * in the receive path at any given time. | |
1906 | */ | |
1907 | atomic_t rmem_alloc; | |
1908 | ||
1da177e4 LT |
1909 | /* This is the wait queue head for send requests waiting on |
1910 | * the association sndbuf space. | |
1911 | */ | |
1912 | wait_queue_head_t wait; | |
1913 | ||
1da177e4 LT |
1914 | /* The message size at which SCTP fragmentation will occur. */ |
1915 | __u32 frag_point; | |
f68b2e05 | 1916 | __u32 user_frag; |
1da177e4 | 1917 | |
3f7a87d2 FF |
1918 | /* Counter used to count INIT errors. */ |
1919 | int init_err_counter; | |
1920 | ||
1921 | /* Count the number of INIT cycles (for doubling timeout). */ | |
1922 | int init_cycle; | |
1da177e4 LT |
1923 | |
1924 | /* Default send parameters. */ | |
1925 | __u16 default_stream; | |
1926 | __u16 default_flags; | |
1927 | __u32 default_ppid; | |
1928 | __u32 default_context; | |
1929 | __u32 default_timetolive; | |
1930 | ||
6ab792f5 ISJ |
1931 | /* Default receive parameters */ |
1932 | __u32 default_rcv_context; | |
1933 | ||
a8386317 | 1934 | /* Stream arrays */ |
cee360ab | 1935 | struct sctp_stream stream; |
1da177e4 LT |
1936 | |
1937 | /* All outbound chunks go through this structure. */ | |
1938 | struct sctp_outq outqueue; | |
1939 | ||
1940 | /* A smart pipe that will handle reordering and fragmentation, | |
1941 | * as well as handle passing events up to the ULP. | |
1942 | */ | |
1943 | struct sctp_ulpq ulpq; | |
1944 | ||
1945 | /* Last TSN that caused an ECNE Chunk to be sent. */ | |
1946 | __u32 last_ecne_tsn; | |
1947 | ||
1948 | /* Last TSN that caused a CWR Chunk to be sent. */ | |
1949 | __u32 last_cwr_tsn; | |
1950 | ||
1951 | /* How many duplicated TSNs have we seen? */ | |
1952 | int numduptsns; | |
1953 | ||
1da177e4 LT |
1954 | /* These are to support |
1955 | * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses | |
1956 | * and Enforcement of Flow and Message Limits" | |
1957 | * <draft-ietf-tsvwg-addip-sctp-02.txt> | |
1958 | * or "ADDIP" for short. | |
1959 | */ | |
1960 | ||
1961 | ||
1962 | ||
1963 | /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks | |
1964 | * | |
1965 | * R1) One and only one ASCONF Chunk MAY be in transit and | |
1966 | * unacknowledged at any one time. If a sender, after sending | |
1967 | * an ASCONF chunk, decides it needs to transfer another | |
1968 | * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk | |
1969 | * returns from the previous ASCONF Chunk before sending a | |
1970 | * subsequent ASCONF. Note this restriction binds each side, | |
1971 | * so at any time two ASCONF may be in-transit on any given | |
1972 | * association (one sent from each endpoint). | |
1973 | * | |
1974 | * [This is our one-and-only-one ASCONF in flight. If we do | |
1975 | * not have an ASCONF in flight, this is NULL.] | |
1976 | */ | |
1977 | struct sctp_chunk *addip_last_asconf; | |
1978 | ||
a08de64d | 1979 | /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. |
1da177e4 | 1980 | * |
a08de64d VY |
1981 | * This is needed to implement itmes E1 - E4 of the updated |
1982 | * spec. Here is the justification: | |
1da177e4 | 1983 | * |
a08de64d VY |
1984 | * Since the peer may bundle multiple ASCONF chunks toward us, |
1985 | * we now need the ability to cache multiple ACKs. The section | |
1986 | * describes in detail how they are cached and cleaned up. | |
1da177e4 | 1987 | */ |
a08de64d | 1988 | struct list_head asconf_ack_list; |
1da177e4 LT |
1989 | |
1990 | /* These ASCONF chunks are waiting to be sent. | |
1991 | * | |
1992 | * These chunaks can't be pushed to outqueue until receiving | |
1993 | * ASCONF_ACK for the previous ASCONF indicated by | |
1994 | * addip_last_asconf, so as to guarantee that only one ASCONF | |
1995 | * is in flight at any time. | |
1996 | * | |
1997 | * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks | |
1998 | * | |
1999 | * In defining the ASCONF Chunk transfer procedures, it is | |
2000 | * essential that these transfers MUST NOT cause congestion | |
2001 | * within the network. To achieve this, we place these | |
2002 | * restrictions on the transfer of ASCONF Chunks: | |
2003 | * | |
2004 | * R1) One and only one ASCONF Chunk MAY be in transit and | |
2005 | * unacknowledged at any one time. If a sender, after sending | |
2006 | * an ASCONF chunk, decides it needs to transfer another | |
2007 | * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk | |
2008 | * returns from the previous ASCONF Chunk before sending a | |
2009 | * subsequent ASCONF. Note this restriction binds each side, | |
2010 | * so at any time two ASCONF may be in-transit on any given | |
2011 | * association (one sent from each endpoint). | |
2012 | * | |
2013 | * | |
2014 | * [I really think this is EXACTLY the sort of intelligence | |
2015 | * which already resides in sctp_outq. Please move this | |
2016 | * queue and its supporting logic down there. --piggy] | |
2017 | */ | |
79af02c2 | 2018 | struct list_head addip_chunk_list; |
1da177e4 LT |
2019 | |
2020 | /* ADDIP Section 4.1 ASCONF Chunk Procedures | |
2021 | * | |
2022 | * A2) A serial number should be assigned to the Chunk. The | |
2023 | * serial number SHOULD be a monotonically increasing | |
2024 | * number. The serial number SHOULD be initialized at | |
2025 | * the start of the association to the same value as the | |
2026 | * Initial TSN and every time a new ASCONF chunk is created | |
2027 | * it is incremented by one after assigning the serial number | |
2028 | * to the newly created chunk. | |
2029 | * | |
2030 | * ADDIP | |
2031 | * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) | |
2032 | * | |
2033 | * Serial Number : 32 bits (unsigned integer) | |
2034 | * | |
2035 | * This value represents a Serial Number for the ASCONF | |
2036 | * Chunk. The valid range of Serial Number is from 0 to | |
2037 | * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 | |
2038 | * after reaching 4294967295. | |
2039 | */ | |
2040 | __u32 addip_serial; | |
8a07eb0a | 2041 | int src_out_of_asoc_ok; |
be78cfcb | 2042 | union sctp_addr *asconf_addr_del_pending; |
6af29ccc | 2043 | struct sctp_transport *new_transport; |
1da177e4 | 2044 | |
1f485649 VY |
2045 | /* SCTP AUTH: list of the endpoint shared keys. These |
2046 | * keys are provided out of band by the user applicaton | |
2047 | * and can't change during the lifetime of the association | |
2048 | */ | |
2049 | struct list_head endpoint_shared_keys; | |
2050 | ||
2051 | /* SCTP AUTH: | |
2052 | * The current generated assocaition shared key (secret) | |
2053 | */ | |
2054 | struct sctp_auth_bytes *asoc_shared_key; | |
1b1e0bc9 | 2055 | struct sctp_shared_key *shkey; |
1f485649 VY |
2056 | |
2057 | /* SCTP AUTH: hmac id of the first peer requested algorithm | |
2058 | * that we support. | |
2059 | */ | |
2060 | __u16 default_hmac_id; | |
2061 | ||
2062 | __u16 active_key_id; | |
2063 | ||
9237ccbc | 2064 | __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ |
28aa4c26 | 2065 | temp:1, /* Is it a temporary association? */ |
f9ba3501 | 2066 | force_delay:1, |
772a5869 | 2067 | intl_enable:1, |
c28445c3 XL |
2068 | prsctp_enable:1, |
2069 | reconf_enable:1; | |
196d6759 | 2070 | |
9fb657ae | 2071 | __u8 strreset_enable; |
7f9d68ac | 2072 | __u8 strreset_outstanding; /* request param count on the fly */ |
9fb657ae | 2073 | |
cc16f00f XL |
2074 | __u32 strreset_outseq; /* Update after receiving response */ |
2075 | __u32 strreset_inseq; /* Update after receiving request */ | |
e4dc99c7 | 2076 | __u32 strreset_result[2]; /* save the results of last 2 responses */ |
cc16f00f | 2077 | |
7b9438de XL |
2078 | struct sctp_chunk *strreset_chunk; /* save request chunk */ |
2079 | ||
196d6759 | 2080 | struct sctp_priv_assoc_stats stats; |
826d253d | 2081 | |
8dbdf1f5 XL |
2082 | int sent_cnt_removable; |
2083 | ||
a1e3a059 XL |
2084 | __u16 subscribe; |
2085 | ||
826d253d XL |
2086 | __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; |
2087 | __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; | |
fb6df5a6 XL |
2088 | |
2089 | struct rcu_head rcu; | |
1da177e4 LT |
2090 | }; |
2091 | ||
2092 | ||
2093 | /* An eyecatcher for determining if we are really looking at an | |
2094 | * association data structure. | |
2095 | */ | |
2096 | enum { | |
2097 | SCTP_ASSOC_EYECATCHER = 0xa550c123, | |
2098 | }; | |
2099 | ||
2100 | /* Recover the outter association structure. */ | |
2101 | static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) | |
2102 | { | |
2103 | struct sctp_association *asoc; | |
2104 | ||
2105 | asoc = container_of(base, struct sctp_association, base); | |
2106 | return asoc; | |
2107 | } | |
2108 | ||
2109 | /* These are function signatures for manipulating associations. */ | |
2110 | ||
2111 | ||
2112 | struct sctp_association * | |
1c662018 XL |
2113 | sctp_association_new(const struct sctp_endpoint *ep, const struct sock *sk, |
2114 | enum sctp_scope scope, gfp_t gfp); | |
1da177e4 LT |
2115 | void sctp_association_free(struct sctp_association *); |
2116 | void sctp_association_put(struct sctp_association *); | |
2117 | void sctp_association_hold(struct sctp_association *); | |
2118 | ||
9919b455 WY |
2119 | struct sctp_transport *sctp_assoc_choose_alter_transport( |
2120 | struct sctp_association *, struct sctp_transport *); | |
1da177e4 LT |
2121 | void sctp_assoc_update_retran_path(struct sctp_association *); |
2122 | struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, | |
2123 | const union sctp_addr *); | |
2124 | int sctp_assoc_lookup_laddr(struct sctp_association *asoc, | |
2125 | const union sctp_addr *laddr); | |
2126 | struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, | |
2127 | const union sctp_addr *address, | |
dd0fc66f | 2128 | const gfp_t gfp, |
3f7a87d2 | 2129 | const int peer_state); |
1da177e4 LT |
2130 | void sctp_assoc_del_peer(struct sctp_association *asoc, |
2131 | const union sctp_addr *addr); | |
3f7a87d2 FF |
2132 | void sctp_assoc_rm_peer(struct sctp_association *asoc, |
2133 | struct sctp_transport *peer); | |
0ceaeebe XL |
2134 | void sctp_assoc_control_transport(struct sctp_association *asoc, |
2135 | struct sctp_transport *transport, | |
2136 | enum sctp_transport_cmd command, | |
2137 | sctp_sn_error_t error); | |
1da177e4 | 2138 | struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); |
1da177e4 | 2139 | void sctp_assoc_migrate(struct sctp_association *, struct sock *); |
5ee8aa68 XL |
2140 | int sctp_assoc_update(struct sctp_association *old, |
2141 | struct sctp_association *new); | |
1da177e4 LT |
2142 | |
2143 | __u32 sctp_association_get_next_tsn(struct sctp_association *); | |
2144 | ||
2f5e3c9d | 2145 | void sctp_assoc_update_frag_point(struct sctp_association *asoc); |
c4b2893d | 2146 | void sctp_assoc_set_pmtu(struct sctp_association *asoc, __u32 pmtu); |
3ebfdf08 | 2147 | void sctp_assoc_sync_pmtu(struct sctp_association *asoc); |
362d5204 DB |
2148 | void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); |
2149 | void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); | |
1da177e4 LT |
2150 | void sctp_assoc_set_primary(struct sctp_association *, |
2151 | struct sctp_transport *); | |
42e30bf3 VY |
2152 | void sctp_assoc_del_nonprimary_peers(struct sctp_association *, |
2153 | struct sctp_transport *); | |
1c662018 XL |
2154 | int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, |
2155 | enum sctp_scope scope, gfp_t gfp); | |
1da177e4 | 2156 | int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, |
3182cd84 | 2157 | struct sctp_cookie*, |
dd0fc66f | 2158 | gfp_t gfp); |
07d93967 | 2159 | int sctp_assoc_set_id(struct sctp_association *, gfp_t); |
a08de64d VY |
2160 | void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); |
2161 | struct sctp_chunk *sctp_assoc_lookup_asconf_ack( | |
2162 | const struct sctp_association *asoc, | |
2163 | __be32 serial); | |
a000c01e | 2164 | void sctp_asconf_queue_teardown(struct sctp_association *asoc); |
1da177e4 LT |
2165 | |
2166 | int sctp_cmp_addr_exact(const union sctp_addr *ss1, | |
2167 | const union sctp_addr *ss2); | |
2168 | struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); | |
2169 | ||
2170 | /* A convenience structure to parse out SCTP specific CMSGs. */ | |
a05437ac | 2171 | struct sctp_cmsgs { |
1da177e4 | 2172 | struct sctp_initmsg *init; |
63b94938 GOV |
2173 | struct sctp_sndrcvinfo *srinfo; |
2174 | struct sctp_sndinfo *sinfo; | |
ed63afb8 | 2175 | struct sctp_prinfo *prinfo; |
3ff547c0 | 2176 | struct sctp_authinfo *authinfo; |
2c0dbaa0 | 2177 | struct msghdr *addrs_msg; |
a05437ac | 2178 | }; |
1da177e4 LT |
2179 | |
2180 | /* Structure for tracking memory objects */ | |
d38ef5ae | 2181 | struct sctp_dbg_objcnt_entry { |
1da177e4 LT |
2182 | char *label; |
2183 | atomic_t *counter; | |
d38ef5ae | 2184 | }; |
1da177e4 LT |
2185 | |
2186 | #endif /* __sctp_structs_h__ */ |