]>
Commit | Line | Data |
---|---|---|
47505b8b | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
60c778b2 | 2 | /* SCTP kernel implementation |
1da177e4 LT |
3 | * (C) Copyright IBM Corp. 2001, 2004 |
4 | * Copyright (c) 1999-2000 Cisco, Inc. | |
5 | * Copyright (c) 1999-2001 Motorola, Inc. | |
6 | * Copyright (c) 2001 Intel Corp. | |
7 | * | |
60c778b2 | 8 | * This file is part of the SCTP kernel implementation |
1da177e4 | 9 | * |
1da177e4 LT |
10 | * Please send any bug reports or fixes you make to the |
11 | * email addresses: | |
91705c61 | 12 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 13 | * |
1da177e4 LT |
14 | * Written or modified by: |
15 | * Randall Stewart <randall@sctp.chicago.il.us> | |
16 | * Ken Morneau <kmorneau@cisco.com> | |
17 | * Qiaobing Xie <qxie1@email.mot.com> | |
18 | * La Monte H.P. Yarroll <piggy@acm.org> | |
19 | * Karl Knutson <karl@athena.chicago.il.us> | |
20 | * Jon Grimm <jgrimm@us.ibm.com> | |
21 | * Xingang Guo <xingang.guo@intel.com> | |
22 | * Hui Huang <hui.huang@nokia.com> | |
23 | * Sridhar Samudrala <sri@us.ibm.com> | |
24 | * Daisy Chang <daisyc@us.ibm.com> | |
25 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
26 | * Ardelle Fan <ardelle.fan@intel.com> | |
27 | * Ryan Layer <rmlayer@us.ibm.com> | |
28 | * Anup Pemmaiah <pemmaiah@cc.usu.edu> | |
29 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
30 | */ |
31 | ||
32 | #ifndef __sctp_structs_h__ | |
33 | #define __sctp_structs_h__ | |
34 | ||
52db882f | 35 | #include <linux/ktime.h> |
2075e50c | 36 | #include <linux/generic-radix-tree.h> |
0eb71a9d | 37 | #include <linux/rhashtable-types.h> |
1da177e4 LT |
38 | #include <linux/socket.h> /* linux/in.h needs this!! */ |
39 | #include <linux/in.h> /* We get struct sockaddr_in. */ | |
40 | #include <linux/in6.h> /* We get struct in6_addr */ | |
41 | #include <linux/ipv6.h> | |
42 | #include <asm/param.h> /* We get MAXHOSTNAMELEN. */ | |
60063497 | 43 | #include <linux/atomic.h> /* This gets us atomic counters. */ |
1da177e4 LT |
44 | #include <linux/skbuff.h> /* We need sk_buff_head. */ |
45 | #include <linux/workqueue.h> /* We need tq_struct. */ | |
46 | #include <linux/sctp.h> /* We need sctp* header structs. */ | |
1f485649 | 47 | #include <net/sctp/auth.h> /* We need auth specific structs */ |
9e238323 | 48 | #include <net/ip.h> /* For inet_skb_parm */ |
1da177e4 LT |
49 | |
50 | /* A convenience structure for handling sockaddr structures. | |
51 | * We should wean ourselves off this. | |
52 | */ | |
53 | union sctp_addr { | |
54 | struct sockaddr_in v4; | |
55 | struct sockaddr_in6 v6; | |
56 | struct sockaddr sa; | |
57 | }; | |
58 | ||
59 | /* Forward declarations for data structures. */ | |
60 | struct sctp_globals; | |
61 | struct sctp_endpoint; | |
62 | struct sctp_association; | |
63 | struct sctp_transport; | |
64 | struct sctp_packet; | |
65 | struct sctp_chunk; | |
66 | struct sctp_inq; | |
67 | struct sctp_outq; | |
68 | struct sctp_bind_addr; | |
69 | struct sctp_ulpq; | |
70 | struct sctp_ep_common; | |
5821c769 | 71 | struct crypto_shash; |
1511949c | 72 | struct sctp_stream; |
1da177e4 LT |
73 | |
74 | ||
75 | #include <net/sctp/tsnmap.h> | |
76 | #include <net/sctp/ulpevent.h> | |
77 | #include <net/sctp/ulpqueue.h> | |
0c3f6f65 | 78 | #include <net/sctp/stream_interleave.h> |
1da177e4 LT |
79 | |
80 | /* Structures useful for managing bind/connect. */ | |
81 | ||
82 | struct sctp_bind_bucket { | |
83 | unsigned short port; | |
6ba84574 XL |
84 | signed char fastreuse; |
85 | signed char fastreuseport; | |
86 | kuid_t fastuid; | |
d970dbf8 | 87 | struct hlist_node node; |
1da177e4 | 88 | struct hlist_head owner; |
f1f43763 | 89 | struct net *net; |
1da177e4 LT |
90 | }; |
91 | ||
92 | struct sctp_bind_hashbucket { | |
93 | spinlock_t lock; | |
d970dbf8 | 94 | struct hlist_head chain; |
1da177e4 LT |
95 | }; |
96 | ||
97 | /* Used for hashing all associations. */ | |
98 | struct sctp_hashbucket { | |
99 | rwlock_t lock; | |
d970dbf8 | 100 | struct hlist_head chain; |
1da177e4 LT |
101 | } __attribute__((__aligned__(8))); |
102 | ||
103 | ||
104 | /* The SCTP globals structure. */ | |
105 | extern struct sctp_globals { | |
1da177e4 LT |
106 | /* This is a list of groups of functions for each address |
107 | * family that we support. | |
108 | */ | |
109 | struct list_head address_families; | |
110 | ||
111 | /* This is the hash of all endpoints. */ | |
1da177e4 | 112 | struct sctp_hashbucket *ep_hashtable; |
1da177e4 | 113 | /* This is the sctp port control hash. */ |
1da177e4 | 114 | struct sctp_bind_hashbucket *port_hashtable; |
d6c0256a | 115 | /* This is the hash of all transports. */ |
7fda702f | 116 | struct rhltable transport_hashtable; |
71acc0dd | 117 | |
76bfd898 DB |
118 | /* Sizes of above hashtables. */ |
119 | int ep_hashsize; | |
76bfd898 DB |
120 | int port_hashsize; |
121 | ||
122 | /* Default initialization values to be applied to new associations. */ | |
123 | __u16 max_instreams; | |
124 | __u16 max_outstreams; | |
125 | ||
71acc0dd DM |
126 | /* Flag to indicate whether computing and verifying checksum |
127 | * is disabled. */ | |
128 | bool checksum_disable; | |
1da177e4 LT |
129 | } sctp_globals; |
130 | ||
1da177e4 LT |
131 | #define sctp_max_instreams (sctp_globals.max_instreams) |
132 | #define sctp_max_outstreams (sctp_globals.max_outstreams) | |
133 | #define sctp_address_families (sctp_globals.address_families) | |
134 | #define sctp_ep_hashsize (sctp_globals.ep_hashsize) | |
135 | #define sctp_ep_hashtable (sctp_globals.ep_hashtable) | |
1da177e4 | 136 | #define sctp_port_hashsize (sctp_globals.port_hashsize) |
1da177e4 | 137 | #define sctp_port_hashtable (sctp_globals.port_hashtable) |
d6c0256a | 138 | #define sctp_transport_hashtable (sctp_globals.transport_hashtable) |
71acc0dd | 139 | #define sctp_checksum_disable (sctp_globals.checksum_disable) |
1da177e4 LT |
140 | |
141 | /* SCTP Socket type: UDP or TCP style. */ | |
b7ef2618 | 142 | enum sctp_socket_type { |
1da177e4 LT |
143 | SCTP_SOCKET_UDP = 0, |
144 | SCTP_SOCKET_UDP_HIGH_BANDWIDTH, | |
145 | SCTP_SOCKET_TCP | |
b7ef2618 | 146 | }; |
1da177e4 LT |
147 | |
148 | /* Per socket SCTP information. */ | |
149 | struct sctp_sock { | |
150 | /* inet_sock has to be the first member of sctp_sock */ | |
151 | struct inet_sock inet; | |
152 | /* What kind of a socket is this? */ | |
b7ef2618 | 153 | enum sctp_socket_type type; |
1da177e4 LT |
154 | |
155 | /* PF_ family specific functions. */ | |
156 | struct sctp_pf *pf; | |
157 | ||
158 | /* Access to HMAC transform. */ | |
5821c769 | 159 | struct crypto_shash *hmac; |
3c68198e | 160 | char *sctp_hmac_alg; |
1da177e4 LT |
161 | |
162 | /* What is our base endpointer? */ | |
163 | struct sctp_endpoint *ep; | |
164 | ||
165 | struct sctp_bind_bucket *bind_hash; | |
166 | /* Various Socket Options. */ | |
167 | __u16 default_stream; | |
168 | __u32 default_ppid; | |
169 | __u16 default_flags; | |
170 | __u32 default_context; | |
171 | __u32 default_timetolive; | |
6ab792f5 | 172 | __u32 default_rcv_context; |
70331571 | 173 | int max_burst; |
1da177e4 | 174 | |
52ccb8e9 FF |
175 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
176 | * the destination address every heartbeat interval. This value | |
177 | * will be inherited by all new associations. | |
178 | */ | |
179 | __u32 hbinterval; | |
d1e462a7 | 180 | __u32 probe_interval; |
52ccb8e9 | 181 | |
f1bfe8b5 | 182 | __be16 udp_port; |
e8a3001c XL |
183 | __be16 encap_port; |
184 | ||
52ccb8e9 FF |
185 | /* This is the max_retrans value for new associations. */ |
186 | __u16 pathmaxrxt; | |
187 | ||
8a9c58d2 XL |
188 | __u32 flowlabel; |
189 | __u8 dscp; | |
190 | ||
34515e94 XL |
191 | __u16 pf_retrans; |
192 | __u16 ps_retrans; | |
8add543e | 193 | |
52ccb8e9 FF |
194 | /* The initial Path MTU to use for new associations. */ |
195 | __u32 pathmtu; | |
196 | ||
197 | /* The default SACK delay timeout for new associations. */ | |
198 | __u32 sackdelay; | |
d364d927 | 199 | __u32 sackfreq; |
52ccb8e9 | 200 | |
f4ab2f72 | 201 | /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
52ccb8e9 FF |
202 | __u32 param_flags; |
203 | ||
7efba10d XL |
204 | __u32 default_ss; |
205 | ||
1da177e4 LT |
206 | struct sctp_rtoinfo rtoinfo; |
207 | struct sctp_paddrparams paddrparam; | |
1da177e4 | 208 | struct sctp_assocparams assocparams; |
0d3a421d | 209 | |
ab9ee8e3 DW |
210 | /* |
211 | * These two structures must be grouped together for the usercopy | |
212 | * whitelist region. | |
213 | */ | |
2cc0eeb6 | 214 | __u16 subscribe; |
ab9ee8e3 DW |
215 | struct sctp_initmsg initmsg; |
216 | ||
1da177e4 | 217 | int user_frag; |
0d3a421d | 218 | |
1da177e4 | 219 | __u32 autoclose; |
0f3fffd8 | 220 | __u32 adaptation_ind; |
d49d91d7 | 221 | __u32 pd_point; |
250eb1f8 | 222 | __u16 nodelay:1, |
aef587be | 223 | pf_expose:2, |
b0e9a2fe | 224 | reuse:1, |
250eb1f8 MRL |
225 | disable_fragments:1, |
226 | v4mapped:1, | |
227 | frag_interleave:1, | |
228 | recvrcvinfo:1, | |
fb586f25 | 229 | recvnxtinfo:1, |
0970f5b3 | 230 | data_ready_signalled:1; |
1da177e4 | 231 | |
b6e1331f | 232 | atomic_t pd_mode; |
fe81d9f6 HP |
233 | |
234 | /* Fields after this point will be skipped on copies, like on accept | |
235 | * and peeloff operations | |
236 | */ | |
237 | ||
1da177e4 LT |
238 | /* Receive to here while partial delivery is in effect. */ |
239 | struct sk_buff_head pd_lobby; | |
2d45a02d | 240 | |
9f7d653b MH |
241 | struct list_head auto_asconf_list; |
242 | int do_auto_asconf; | |
1da177e4 LT |
243 | }; |
244 | ||
245 | static inline struct sctp_sock *sctp_sk(const struct sock *sk) | |
246 | { | |
247 | return (struct sctp_sock *)sk; | |
248 | } | |
249 | ||
250 | static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) | |
251 | { | |
252 | return (struct sock *)sp; | |
253 | } | |
254 | ||
dfd56b8b | 255 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
256 | struct sctp6_sock { |
257 | struct sctp_sock sctp; | |
258 | struct ipv6_pinfo inet6; | |
259 | }; | |
260 | #endif /* CONFIG_IPV6 */ | |
261 | ||
262 | ||
263 | /* This is our APPLICATION-SPECIFIC state cookie. | |
264 | * THIS IS NOT DICTATED BY THE SPECIFICATION. | |
265 | */ | |
266 | /* These are the parts of an association which we send in the cookie. | |
267 | * Most of these are straight out of: | |
268 | * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) | |
269 | * | |
270 | */ | |
271 | ||
272 | struct sctp_cookie { | |
273 | ||
274 | /* My : Tag expected in every inbound packet and sent | |
275 | * Verification: in the INIT or INIT ACK chunk. | |
276 | * Tag : | |
277 | */ | |
278 | __u32 my_vtag; | |
279 | ||
280 | /* Peer's : Tag expected in every outbound packet except | |
281 | * Verification: in the INIT chunk. | |
282 | * Tag : | |
283 | */ | |
284 | __u32 peer_vtag; | |
285 | ||
286 | /* The rest of these are not from the spec, but really need to | |
287 | * be in the cookie. | |
288 | */ | |
289 | ||
290 | /* My Tie Tag : Assist in discovering a restarting association. */ | |
291 | __u32 my_ttag; | |
292 | ||
293 | /* Peer's Tie Tag: Assist in discovering a restarting association. */ | |
294 | __u32 peer_ttag; | |
295 | ||
296 | /* When does this cookie expire? */ | |
52db882f | 297 | ktime_t expiration; |
1da177e4 LT |
298 | |
299 | /* Number of inbound/outbound streams which are set | |
300 | * and negotiated during the INIT process. | |
301 | */ | |
302 | __u16 sinit_num_ostreams; | |
303 | __u16 sinit_max_instreams; | |
304 | ||
305 | /* This is the first sequence number I used. */ | |
306 | __u32 initial_tsn; | |
307 | ||
308 | /* This holds the originating address of the INIT packet. */ | |
309 | union sctp_addr peer_addr; | |
310 | ||
311 | /* IG Section 2.35.3 | |
312 | * Include the source port of the INIT-ACK | |
313 | */ | |
314 | __u16 my_port; | |
315 | ||
316 | __u8 prsctp_capable; | |
317 | ||
318 | /* Padding for future use */ | |
319 | __u8 padding; | |
320 | ||
0f3fffd8 | 321 | __u32 adaptation_ind; |
1da177e4 | 322 | |
3c918704 XL |
323 | __u8 auth_random[sizeof(struct sctp_paramhdr) + |
324 | SCTP_AUTH_RANDOM_LENGTH]; | |
028dba0a | 325 | __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; |
3c918704 | 326 | __u8 auth_chunks[sizeof(struct sctp_paramhdr) + SCTP_AUTH_MAX_CHUNKS]; |
1da177e4 LT |
327 | |
328 | /* This is a shim for my peer's INIT packet, followed by | |
329 | * a copy of the raw address list of the association. | |
330 | * The length of the raw address list is saved in the | |
331 | * raw_addr_list_len field, which will be used at the time when | |
332 | * the association TCB is re-constructed from the cookie. | |
333 | */ | |
334 | __u32 raw_addr_list_len; | |
2e7aaaa1 | 335 | struct sctp_init_chunk peer_init[]; |
1da177e4 LT |
336 | }; |
337 | ||
338 | ||
339 | /* The format of our cookie that we send to our peer. */ | |
340 | struct sctp_signed_cookie { | |
341 | __u8 signature[SCTP_SECRET_SIZE]; | |
9834a2bb | 342 | __u32 __pad; /* force sctp_cookie alignment to 64 bits */ |
1da177e4 | 343 | struct sctp_cookie c; |
bc10502d | 344 | } __packed; |
1da177e4 LT |
345 | |
346 | /* This is another convenience type to allocate memory for address | |
347 | * params for the maximum size and pass such structures around | |
348 | * internally. | |
349 | */ | |
350 | union sctp_addr_param { | |
6f4c618d | 351 | struct sctp_paramhdr p; |
1da177e4 LT |
352 | struct sctp_ipv4addr_param v4; |
353 | struct sctp_ipv6addr_param v6; | |
354 | }; | |
355 | ||
356 | /* A convenience type to allow walking through the various | |
357 | * parameters and avoid casting all over the place. | |
358 | */ | |
359 | union sctp_params { | |
360 | void *v; | |
361 | struct sctp_paramhdr *p; | |
362 | struct sctp_cookie_preserve_param *life; | |
363 | struct sctp_hostname_param *dns; | |
364 | struct sctp_cookie_param *cookie; | |
365 | struct sctp_supported_addrs_param *sat; | |
366 | struct sctp_ipv4addr_param *v4; | |
367 | struct sctp_ipv6addr_param *v6; | |
368 | union sctp_addr_param *addr; | |
0f3fffd8 | 369 | struct sctp_adaptation_ind_param *aind; |
131a47e3 | 370 | struct sctp_supported_ext_param *ext; |
1f485649 VY |
371 | struct sctp_random_param *random; |
372 | struct sctp_chunks_param *chunks; | |
373 | struct sctp_hmac_algo_param *hmac_algo; | |
d6de3097 | 374 | struct sctp_addip_param *addip; |
1da177e4 LT |
375 | }; |
376 | ||
377 | /* RFC 2960. Section 3.3.5 Heartbeat. | |
378 | * Heartbeat Information: variable length | |
379 | * The Sender-specific Heartbeat Info field should normally include | |
380 | * information about the sender's current time when this HEARTBEAT | |
381 | * chunk is sent and the destination transport address to which this | |
382 | * HEARTBEAT is sent (see Section 8.3). | |
383 | */ | |
edf903f8 | 384 | struct sctp_sender_hb_info { |
1da177e4 LT |
385 | struct sctp_paramhdr param_hdr; |
386 | union sctp_addr daddr; | |
387 | unsigned long sent_at; | |
ad8fec17 | 388 | __u64 hb_nonce; |
fe59379b | 389 | __u32 probe_size; |
edf903f8 | 390 | }; |
1da177e4 | 391 | |
ff356414 XL |
392 | int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, |
393 | gfp_t gfp); | |
f952be79 | 394 | int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid); |
a8386317 XL |
395 | void sctp_stream_free(struct sctp_stream *stream); |
396 | void sctp_stream_clear(struct sctp_stream *stream); | |
cee360ab | 397 | void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new); |
1da177e4 LT |
398 | |
399 | /* What is the current SSN number for this stream? */ | |
a8386317 | 400 | #define sctp_ssn_peek(stream, type, sid) \ |
05364ca0 | 401 | (sctp_stream_##type((stream), (sid))->ssn) |
1da177e4 LT |
402 | |
403 | /* Return the next SSN number for this stream. */ | |
a8386317 | 404 | #define sctp_ssn_next(stream, type, sid) \ |
05364ca0 | 405 | (sctp_stream_##type((stream), (sid))->ssn++) |
1da177e4 LT |
406 | |
407 | /* Skip over this ssn and all below. */ | |
a8386317 | 408 | #define sctp_ssn_skip(stream, type, sid, ssn) \ |
05364ca0 | 409 | (sctp_stream_##type((stream), (sid))->ssn = ssn + 1) |
a8386317 | 410 | |
668c9beb XL |
411 | /* What is the current MID number for this stream? */ |
412 | #define sctp_mid_peek(stream, type, sid) \ | |
05364ca0 | 413 | (sctp_stream_##type((stream), (sid))->mid) |
668c9beb XL |
414 | |
415 | /* Return the next MID number for this stream. */ | |
416 | #define sctp_mid_next(stream, type, sid) \ | |
05364ca0 | 417 | (sctp_stream_##type((stream), (sid))->mid++) |
668c9beb XL |
418 | |
419 | /* Skip over this mid and all below. */ | |
420 | #define sctp_mid_skip(stream, type, sid, mid) \ | |
05364ca0 | 421 | (sctp_stream_##type((stream), (sid))->mid = mid + 1) |
bd4d627d | 422 | |
13228238 XL |
423 | /* What is the current MID_uo number for this stream? */ |
424 | #define sctp_mid_uo_peek(stream, type, sid) \ | |
05364ca0 | 425 | (sctp_stream_##type((stream), (sid))->mid_uo) |
13228238 XL |
426 | |
427 | /* Return the next MID_uo number for this stream. */ | |
428 | #define sctp_mid_uo_next(stream, type, sid) \ | |
05364ca0 | 429 | (sctp_stream_##type((stream), (sid))->mid_uo++) |
13228238 | 430 | |
1da177e4 LT |
431 | /* |
432 | * Pointers to address related SCTP functions. | |
433 | * (i.e. things that depend on the address family.) | |
434 | */ | |
435 | struct sctp_af { | |
436 | int (*sctp_xmit) (struct sk_buff *skb, | |
f880374c | 437 | struct sctp_transport *); |
1da177e4 LT |
438 | int (*setsockopt) (struct sock *sk, |
439 | int level, | |
440 | int optname, | |
a7b75c5a | 441 | sockptr_t optval, |
b7058842 | 442 | unsigned int optlen); |
1da177e4 LT |
443 | int (*getsockopt) (struct sock *sk, |
444 | int level, | |
445 | int optname, | |
446 | char __user *optval, | |
447 | int __user *optlen); | |
da0420be | 448 | void (*get_dst) (struct sctp_transport *t, |
9914ae3c VY |
449 | union sctp_addr *saddr, |
450 | struct flowi *fl, | |
451 | struct sock *sk); | |
e5117101 | 452 | void (*get_saddr) (struct sctp_sock *sk, |
9914ae3c | 453 | struct sctp_transport *t, |
9914ae3c | 454 | struct flowi *fl); |
1da177e4 LT |
455 | void (*copy_addrlist) (struct list_head *, |
456 | struct net_device *); | |
1da177e4 LT |
457 | int (*cmp_addr) (const union sctp_addr *addr1, |
458 | const union sctp_addr *addr2); | |
459 | void (*addr_copy) (union sctp_addr *dst, | |
460 | union sctp_addr *src); | |
461 | void (*from_skb) (union sctp_addr *, | |
462 | struct sk_buff *skb, | |
463 | int saddr); | |
464 | void (*from_sk) (union sctp_addr *, | |
465 | struct sock *sk); | |
0c5dc070 | 466 | bool (*from_addr_param) (union sctp_addr *, |
1da177e4 | 467 | union sctp_addr_param *, |
dd86d136 | 468 | __be16 port, int iif); |
1da177e4 LT |
469 | int (*to_addr_param) (const union sctp_addr *, |
470 | union sctp_addr_param *); | |
471 | int (*addr_valid) (union sctp_addr *, | |
5636bef7 VY |
472 | struct sctp_sock *, |
473 | const struct sk_buff *); | |
1c662018 | 474 | enum sctp_scope (*scope)(union sctp_addr *); |
6fbfa9f9 | 475 | void (*inaddr_any) (union sctp_addr *, __be16); |
1da177e4 LT |
476 | int (*is_any) (const union sctp_addr *); |
477 | int (*available) (union sctp_addr *, | |
478 | struct sctp_sock *); | |
479 | int (*skb_iif) (const struct sk_buff *sk); | |
480 | int (*is_ce) (const struct sk_buff *sk); | |
481 | void (*seq_dump_addr)(struct seq_file *seq, | |
482 | union sctp_addr *addr); | |
b9031d9d | 483 | void (*ecn_capable)(struct sock *sk); |
1da177e4 LT |
484 | __u16 net_header_len; |
485 | int sockaddr_len; | |
b7e10c25 | 486 | int (*ip_options_len)(struct sock *sk); |
1da177e4 LT |
487 | sa_family_t sa_family; |
488 | struct list_head list; | |
489 | }; | |
490 | ||
491 | struct sctp_af *sctp_get_af_specific(sa_family_t); | |
492 | int sctp_register_af(struct sctp_af *); | |
493 | ||
494 | /* Protocol family functions. */ | |
495 | struct sctp_pf { | |
496 | void (*event_msgname)(struct sctp_ulpevent *, char *, int *); | |
497 | void (*skb_msgname) (struct sk_buff *, char *, int *); | |
498 | int (*af_supported) (sa_family_t, struct sctp_sock *); | |
499 | int (*cmp_addr) (const union sctp_addr *, | |
500 | const union sctp_addr *, | |
501 | struct sctp_sock *); | |
502 | int (*bind_verify) (struct sctp_sock *, union sctp_addr *); | |
503 | int (*send_verify) (struct sctp_sock *, union sctp_addr *); | |
3dbe8656 | 504 | int (*supported_addrs)(const struct sctp_sock *, __be16 *); |
1da177e4 | 505 | struct sock *(*create_accept_sk) (struct sock *sk, |
cdfbabfb DH |
506 | struct sctp_association *asoc, |
507 | bool kern); | |
299ee123 JG |
508 | int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); |
509 | void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); | |
510 | void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); | |
b7e10c25 | 511 | void (*copy_ip_options)(struct sock *sk, struct sock *newsk); |
1da177e4 LT |
512 | struct sctp_af *af; |
513 | }; | |
514 | ||
515 | ||
516 | /* Structure to track chunk fragments that have been acked, but peer | |
517 | * fragments of the same message have not. | |
518 | */ | |
519 | struct sctp_datamsg { | |
520 | /* Chunks waiting to be submitted to lower layer. */ | |
521 | struct list_head chunks; | |
1da177e4 | 522 | /* Reference counting. */ |
c0acdfb4 | 523 | refcount_t refcnt; |
1da177e4 LT |
524 | /* When is this message no longer interesting to the peer? */ |
525 | unsigned long expires_at; | |
526 | /* Did the messenge fail to send? */ | |
527 | int send_error; | |
0e3aef8d | 528 | u8 send_failed:1, |
e5f61296 XL |
529 | can_delay:1, /* should this message be Nagle delayed */ |
530 | abandoned:1; /* should this message be abandoned */ | |
1da177e4 LT |
531 | }; |
532 | ||
533 | struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, | |
534 | struct sctp_sndrcvinfo *, | |
e0eb093e | 535 | struct iov_iter *); |
b61c654f | 536 | void sctp_datamsg_free(struct sctp_datamsg *); |
1da177e4 | 537 | void sctp_datamsg_put(struct sctp_datamsg *); |
1da177e4 LT |
538 | void sctp_chunk_fail(struct sctp_chunk *, int error); |
539 | int sctp_chunk_abandoned(struct sctp_chunk *); | |
540 | ||
1da177e4 LT |
541 | /* RFC2960 1.4 Key Terms |
542 | * | |
543 | * o Chunk: A unit of information within an SCTP packet, consisting of | |
544 | * a chunk header and chunk-specific content. | |
545 | * | |
546 | * As a matter of convenience, we remember the SCTP common header for | |
547 | * each chunk as well as a few other header pointers... | |
548 | */ | |
549 | struct sctp_chunk { | |
79af02c2 DM |
550 | struct list_head list; |
551 | ||
e7f02796 | 552 | refcount_t refcnt; |
1da177e4 | 553 | |
73dca124 XL |
554 | /* How many times this chunk have been sent, for prsctp RTX policy */ |
555 | int sent_count; | |
556 | ||
5bbbbe32 MRL |
557 | union { |
558 | /* This is our link to the per-transport transmitted list. */ | |
559 | struct list_head transmitted_list; | |
560 | /* List in specific stream outq */ | |
561 | struct list_head stream_list; | |
562 | }; | |
1da177e4 LT |
563 | |
564 | /* This field is used by chunks that hold fragmented data. | |
565 | * For the first fragment this is the list that holds the rest of | |
566 | * fragments. For the remaining fragments, this is the link to the | |
567 | * frag_list maintained in the first fragment. | |
568 | */ | |
569 | struct list_head frag_list; | |
570 | ||
571 | /* This points to the sk_buff containing the actual data. */ | |
572 | struct sk_buff *skb; | |
573 | ||
1b1e0bc9 XL |
574 | union { |
575 | /* In case of GSO packets, this will store the head one */ | |
576 | struct sk_buff *head_skb; | |
577 | /* In case of auth enabled, this will point to the shkey */ | |
578 | struct sctp_shared_key *shkey; | |
579 | }; | |
90017acc | 580 | |
1da177e4 LT |
581 | /* These are the SCTP headers by reverse order in a packet. |
582 | * Note that some of these may happen more than once. In that | |
583 | * case, we point at the "current" one, whatever that means | |
584 | * for that level of header. | |
585 | */ | |
586 | ||
587 | /* We point this at the FIRST TLV parameter to chunk_hdr. */ | |
588 | union sctp_params param_hdr; | |
589 | union { | |
590 | __u8 *v; | |
591 | struct sctp_datahdr *data_hdr; | |
592 | struct sctp_inithdr *init_hdr; | |
593 | struct sctp_sackhdr *sack_hdr; | |
594 | struct sctp_heartbeathdr *hb_hdr; | |
595 | struct sctp_sender_hb_info *hbs_hdr; | |
596 | struct sctp_shutdownhdr *shutdown_hdr; | |
597 | struct sctp_signed_cookie *cookie_hdr; | |
598 | struct sctp_ecnehdr *ecne_hdr; | |
599 | struct sctp_cwrhdr *ecn_cwr_hdr; | |
600 | struct sctp_errhdr *err_hdr; | |
601 | struct sctp_addiphdr *addip_hdr; | |
602 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; | |
1f485649 | 603 | struct sctp_authhdr *auth_hdr; |
ad05a7a0 | 604 | struct sctp_idatahdr *idata_hdr; |
2d07a49a | 605 | struct sctp_ifwdtsn_hdr *ifwdtsn_hdr; |
1da177e4 LT |
606 | } subh; |
607 | ||
608 | __u8 *chunk_end; | |
609 | ||
610 | struct sctp_chunkhdr *chunk_hdr; | |
611 | struct sctphdr *sctp_hdr; | |
612 | ||
613 | /* This needs to be recoverable for SCTP_SEND_FAILED events. */ | |
614 | struct sctp_sndrcvinfo sinfo; | |
615 | ||
616 | /* Which association does this belong to? */ | |
617 | struct sctp_association *asoc; | |
618 | ||
619 | /* What endpoint received this chunk? */ | |
620 | struct sctp_ep_common *rcvr; | |
621 | ||
622 | /* We fill this in if we are calculating RTT. */ | |
623 | unsigned long sent_at; | |
624 | ||
625 | /* What is the origin IP address for this chunk? */ | |
626 | union sctp_addr source; | |
627 | /* Destination address for this chunk. */ | |
628 | union sctp_addr dest; | |
629 | ||
630 | /* For outbound message, track all fragments for SEND_FAILED. */ | |
631 | struct sctp_datamsg *msg; | |
632 | ||
633 | /* For an inbound chunk, this tells us where it came from. | |
634 | * For an outbound chunk, it tells us where we'd like it to | |
635 | * go. It is NULL if we have no preference. | |
636 | */ | |
637 | struct sctp_transport *transport; | |
638 | ||
bbd0d598 VY |
639 | /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO |
640 | * we need save a pointer to the AUTH chunk, since the SCTP-AUTH | |
641 | * spec violates the principle premis that all chunks are processed | |
642 | * in order. | |
643 | */ | |
644 | struct sk_buff *auth_chunk; | |
645 | ||
c226ef9b NH |
646 | #define SCTP_CAN_FRTX 0x0 |
647 | #define SCTP_NEED_FRTX 0x1 | |
648 | #define SCTP_DONT_FRTX 0x2 | |
649 | __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ | |
c226ef9b NH |
650 | has_tsn:1, /* Does this chunk have a TSN yet? */ |
651 | has_ssn:1, /* Does this chunk have a SSN yet? */ | |
668c9beb | 652 | #define has_mid has_ssn |
c226ef9b NH |
653 | singleton:1, /* Only chunk in the packet? */ |
654 | end_of_packet:1, /* Last chunk in the packet? */ | |
655 | ecn_ce_done:1, /* Have we processed the ECN CE bit? */ | |
656 | pdiscard:1, /* Discard the whole packet now? */ | |
657 | tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ | |
658 | data_accepted:1, /* At least 1 chunk accepted */ | |
659 | auth:1, /* IN: was auth'ed | OUT: needs auth */ | |
660 | has_asconf:1, /* IN: have seen an asconf before */ | |
fe59379b | 661 | pmtu_probe:1, /* Used by PLPMTUD, can be set in s HB chunk */ |
c226ef9b NH |
662 | tsn_missing_report:2, /* Data chunk missing counter. */ |
663 | fast_retransmit:2; /* Is this chunk fast retransmitted? */ | |
1da177e4 LT |
664 | }; |
665 | ||
cc6ac9bc | 666 | #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1) |
1da177e4 LT |
667 | void sctp_chunk_hold(struct sctp_chunk *); |
668 | void sctp_chunk_put(struct sctp_chunk *); | |
e0eb093e AV |
669 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, |
670 | struct iov_iter *from); | |
1da177e4 LT |
671 | void sctp_chunk_free(struct sctp_chunk *); |
672 | void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); | |
673 | struct sctp_chunk *sctp_chunkify(struct sk_buff *, | |
674 | const struct sctp_association *, | |
cea8768f | 675 | struct sock *, gfp_t gfp); |
1da177e4 LT |
676 | void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, |
677 | union sctp_addr *); | |
678 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); | |
679 | ||
2fc019f7 MRL |
680 | static inline __u16 sctp_chunk_stream_no(struct sctp_chunk *ch) |
681 | { | |
682 | return ntohs(ch->subh.data_hdr->stream); | |
683 | } | |
684 | ||
f57d96b2 VY |
685 | enum { |
686 | SCTP_ADDR_NEW, /* new address added to assoc/ep */ | |
687 | SCTP_ADDR_SRC, /* address can be used as source */ | |
688 | SCTP_ADDR_DEL, /* address about to be deleted */ | |
689 | }; | |
690 | ||
1da177e4 | 691 | /* This is a structure for holding either an IPv6 or an IPv4 address. */ |
1da177e4 LT |
692 | struct sctp_sockaddr_entry { |
693 | struct list_head list; | |
29303547 | 694 | struct rcu_head rcu; |
1da177e4 | 695 | union sctp_addr a; |
f57d96b2 | 696 | __u8 state; |
29303547 | 697 | __u8 valid; |
1da177e4 LT |
698 | }; |
699 | ||
9f7d653b MH |
700 | #define SCTP_ADDRESS_TICK_DELAY 500 |
701 | ||
1da177e4 LT |
702 | /* This structure holds lists of chunks as we are assembling for |
703 | * transmission. | |
704 | */ | |
705 | struct sctp_packet { | |
706 | /* These are the SCTP header values (host order) for the packet. */ | |
707 | __u16 source_port; | |
708 | __u16 destination_port; | |
709 | __u32 vtag; | |
710 | ||
711 | /* This contains the payload chunks. */ | |
79af02c2 | 712 | struct list_head chunk_list; |
1da177e4 LT |
713 | |
714 | /* This is the overhead of the sctp and ip headers. */ | |
715 | size_t overhead; | |
716 | /* This is the total size of all chunks INCLUDING padding. */ | |
717 | size_t size; | |
90017acc MRL |
718 | /* This is the maximum size this packet may have */ |
719 | size_t max_size; | |
1da177e4 LT |
720 | |
721 | /* The packet is destined for this transport address. | |
722 | * The function we finally use to pass down to the next lower | |
723 | * layer lives in the transport structure. | |
724 | */ | |
725 | struct sctp_transport *transport; | |
726 | ||
1f485649 VY |
727 | /* pointer to the auth chunk for this packet */ |
728 | struct sctp_chunk *auth; | |
729 | ||
a803c942 VY |
730 | u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ |
731 | has_sack:1, /* This packet contains a SACK chunk. */ | |
732 | has_auth:1, /* This packet contains an AUTH chunk */ | |
733 | has_data:1, /* This packet contains at least 1 DATA chunk */ | |
3e3251b3 | 734 | ipfragok:1; /* So let ip fragment this packet */ |
1da177e4 LT |
735 | }; |
736 | ||
66b91d2c MRL |
737 | void sctp_packet_init(struct sctp_packet *, struct sctp_transport *, |
738 | __u16 sport, __u16 dport); | |
739 | void sctp_packet_config(struct sctp_packet *, __u32 vtag, int); | |
86b36f2a XL |
740 | enum sctp_xmit sctp_packet_transmit_chunk(struct sctp_packet *packet, |
741 | struct sctp_chunk *chunk, | |
742 | int one_packet, gfp_t gfp); | |
743 | enum sctp_xmit sctp_packet_append_chunk(struct sctp_packet *packet, | |
744 | struct sctp_chunk *chunk); | |
cea8768f | 745 | int sctp_packet_transmit(struct sctp_packet *, gfp_t); |
1da177e4 LT |
746 | void sctp_packet_free(struct sctp_packet *); |
747 | ||
748 | static inline int sctp_packet_empty(struct sctp_packet *packet) | |
749 | { | |
a02cec21 | 750 | return packet->size == packet->overhead; |
1da177e4 LT |
751 | } |
752 | ||
753 | /* This represents a remote transport address. | |
754 | * For local transport addresses, we just use union sctp_addr. | |
755 | * | |
756 | * RFC2960 Section 1.4 Key Terms | |
757 | * | |
758 | * o Transport address: A Transport Address is traditionally defined | |
759 | * by Network Layer address, Transport Layer protocol and Transport | |
760 | * Layer port number. In the case of SCTP running over IP, a | |
761 | * transport address is defined by the combination of an IP address | |
762 | * and an SCTP port number (where SCTP is the Transport protocol). | |
763 | * | |
764 | * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control | |
765 | * | |
766 | * o The sender keeps a separate congestion control parameter set for | |
767 | * each of the destination addresses it can send to (not each | |
768 | * source-destination pair but for each destination). The parameters | |
769 | * should decay if the address is not used for a long enough time | |
770 | * period. | |
771 | * | |
772 | */ | |
773 | struct sctp_transport { | |
774 | /* A list of transports. */ | |
775 | struct list_head transports; | |
7fda702f | 776 | struct rhlist_head node; |
1da177e4 LT |
777 | |
778 | /* Reference counting. */ | |
a4b2b58e | 779 | refcount_t refcnt; |
c0058a35 VY |
780 | /* RTO-Pending : A flag used to track if one of the DATA |
781 | * chunks sent to this address is currently being | |
782 | * used to compute a RTT. If this flag is 0, | |
783 | * the next DATA chunk sent to this destination | |
784 | * should be used to compute a RTT and this flag | |
785 | * should be set. Every time the RTT | |
786 | * calculation completes (i.e. the DATA chunk | |
787 | * is SACK'd) clear this flag. | |
788 | */ | |
47faa1e4 | 789 | __u32 rto_pending:1, |
c0058a35 VY |
790 | |
791 | /* | |
792 | * hb_sent : a flag that signals that we have a pending | |
793 | * heartbeat. | |
794 | */ | |
795 | hb_sent:1, | |
796 | ||
c0058a35 | 797 | /* Is the Path MTU update pending on this tranport */ |
38ee8fb6 | 798 | pmtu_pending:1, |
c0058a35 | 799 | |
1f904495 XL |
800 | dst_pending_confirm:1, /* need to confirm neighbour */ |
801 | ||
38ee8fb6 MRL |
802 | /* Has this transport moved the ctsn since we last sacked */ |
803 | sack_generation:1; | |
5a139296 | 804 | u32 dst_cookie; |
4244854d | 805 | |
8663c938 | 806 | struct flowi fl; |
1da177e4 LT |
807 | |
808 | /* This is the peer's IP address and port. */ | |
809 | union sctp_addr ipaddr; | |
810 | ||
811 | /* These are the functions we call to handle LLP stuff. */ | |
812 | struct sctp_af *af_specific; | |
813 | ||
814 | /* Which association do we belong to? */ | |
815 | struct sctp_association *asoc; | |
816 | ||
817 | /* RFC2960 | |
818 | * | |
819 | * 12.3 Per Transport Address Data | |
820 | * | |
821 | * For each destination transport address in the peer's | |
822 | * address list derived from the INIT or INIT ACK chunk, a | |
823 | * number of data elements needs to be maintained including: | |
824 | */ | |
1da177e4 | 825 | /* RTO : The current retransmission timeout value. */ |
8116ffad | 826 | unsigned long rto; |
b6157d8e VY |
827 | |
828 | __u32 rtt; /* This is the most recent RTT. */ | |
1da177e4 LT |
829 | |
830 | /* RTTVAR : The current RTT variation. */ | |
831 | __u32 rttvar; | |
832 | ||
833 | /* SRTT : The current smoothed round trip time. */ | |
834 | __u32 srtt; | |
835 | ||
1da177e4 LT |
836 | /* |
837 | * These are the congestion stats. | |
838 | */ | |
839 | /* cwnd : The current congestion window. */ | |
840 | __u32 cwnd; /* This is the actual cwnd. */ | |
841 | ||
842 | /* ssthresh : The current slow start threshold value. */ | |
843 | __u32 ssthresh; | |
844 | ||
845 | /* partial : The tracking method for increase of cwnd when in | |
846 | * bytes acked : congestion avoidance mode (see Section 6.2.2) | |
847 | */ | |
848 | __u32 partial_bytes_acked; | |
849 | ||
850 | /* Data that has been sent, but not acknowledged. */ | |
851 | __u32 flight_size; | |
852 | ||
46d5a808 VY |
853 | __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ |
854 | ||
1da177e4 LT |
855 | /* Destination */ |
856 | struct dst_entry *dst; | |
857 | /* Source address. */ | |
858 | union sctp_addr saddr; | |
859 | ||
1da177e4 LT |
860 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
861 | * the destination address every heartbeat interval. | |
862 | */ | |
8116ffad | 863 | unsigned long hbinterval; |
d1e462a7 | 864 | unsigned long probe_interval; |
52ccb8e9 FF |
865 | |
866 | /* SACK delay timeout */ | |
8116ffad | 867 | unsigned long sackdelay; |
d364d927 | 868 | __u32 sackfreq; |
1da177e4 | 869 | |
d805397c XL |
870 | atomic_t mtu_info; |
871 | ||
e575235f DB |
872 | /* When was the last time that we heard from this transport? We use |
873 | * this to pick new active and retran paths. | |
1da177e4 | 874 | */ |
e575235f | 875 | ktime_t last_time_heard; |
1da177e4 | 876 | |
ba6f5e33 MRL |
877 | /* When was the last time that we sent a chunk using this |
878 | * transport? We use this to check for idle transports | |
879 | */ | |
880 | unsigned long last_time_sent; | |
881 | ||
1da177e4 LT |
882 | /* Last time(in jiffies) when cwnd is reduced due to the congestion |
883 | * indication based on ECNE chunk. | |
884 | */ | |
885 | unsigned long last_time_ecne_reduced; | |
886 | ||
e8a3001c XL |
887 | __be16 encap_port; |
888 | ||
8116ffad VY |
889 | /* This is the max_retrans value for the transport and will |
890 | * be initialized from the assocs value. This can be changed | |
5aa93bcf | 891 | * using the SCTP_SET_PEER_ADDR_PARAMS socket option. |
8116ffad VY |
892 | */ |
893 | __u16 pathmaxrxt; | |
894 | ||
8a9c58d2 XL |
895 | __u32 flowlabel; |
896 | __u8 dscp; | |
897 | ||
5aa93bcf NH |
898 | /* This is the partially failed retrans value for the transport |
899 | * and will be initialized from the assocs value. This can be changed | |
900 | * using the SCTP_PEER_ADDR_THLDS socket option | |
901 | */ | |
34515e94 XL |
902 | __u16 pf_retrans; |
903 | /* Used for primary path switchover. */ | |
904 | __u16 ps_retrans; | |
8116ffad VY |
905 | /* PMTU : The current known path MTU. */ |
906 | __u32 pathmtu; | |
907 | ||
f4ab2f72 | 908 | /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
8116ffad VY |
909 | __u32 param_flags; |
910 | ||
3f7a87d2 FF |
911 | /* The number of times INIT has been sent on this transport. */ |
912 | int init_sent_count; | |
913 | ||
914 | /* state : The current state of this destination, | |
af901ca1 | 915 | * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. |
1da177e4 | 916 | */ |
3f7a87d2 | 917 | int state; |
1da177e4 | 918 | |
1da177e4 LT |
919 | /* These are the error stats for this destination. */ |
920 | ||
921 | /* Error count : The current error count for this destination. */ | |
922 | unsigned short error_count; | |
923 | ||
1da177e4 LT |
924 | /* Per : A timer used by each destination. |
925 | * Destination : | |
926 | * Timer : | |
927 | * | |
928 | * [Everywhere else in the text this is called T3-rtx. -ed] | |
929 | */ | |
930 | struct timer_list T3_rtx_timer; | |
931 | ||
932 | /* Heartbeat timer is per destination. */ | |
933 | struct timer_list hb_timer; | |
934 | ||
50b5d6ad VY |
935 | /* Timer to handle ICMP proto unreachable envets */ |
936 | struct timer_list proto_unreach_timer; | |
937 | ||
7b9438de XL |
938 | /* Timer to handler reconf chunk rtx */ |
939 | struct timer_list reconf_timer; | |
940 | ||
92548ec2 XL |
941 | /* Timer to send a probe HB packet for PLPMTUD */ |
942 | struct timer_list probe_timer; | |
943 | ||
1da177e4 LT |
944 | /* Since we're using per-destination retransmission timers |
945 | * (see above), we're also using per-destination "transmitted" | |
946 | * queues. This probably ought to be a private struct | |
947 | * accessible only within the outqueue, but it's not, yet. | |
948 | */ | |
949 | struct list_head transmitted; | |
950 | ||
951 | /* We build bundle-able packets for this transport here. */ | |
952 | struct sctp_packet packet; | |
953 | ||
954 | /* This is the list of transports that have chunks to send. */ | |
955 | struct list_head send_ready; | |
956 | ||
1da177e4 LT |
957 | /* State information saved for SFR_CACC algorithm. The key |
958 | * idea in SFR_CACC is to maintain state at the sender on a | |
959 | * per-destination basis when a changeover happens. | |
960 | * char changeover_active; | |
961 | * char cycling_changeover; | |
962 | * __u32 next_tsn_at_change; | |
963 | * char cacc_saw_newack; | |
964 | */ | |
965 | struct { | |
966 | /* An unsigned integer, which stores the next TSN to be | |
967 | * used by the sender, at the moment of changeover. | |
968 | */ | |
969 | __u32 next_tsn_at_change; | |
970 | ||
971 | /* A flag which indicates the occurrence of a changeover */ | |
972 | char changeover_active; | |
973 | ||
974 | /* A flag which indicates whether the change of primary is | |
975 | * the first switch to this destination address during an | |
976 | * active switch. | |
977 | */ | |
978 | char cycling_changeover; | |
979 | ||
980 | /* A temporary flag, which is used during the processing of | |
981 | * a SACK to estimate the causative TSN(s)'s group. | |
982 | */ | |
983 | char cacc_saw_newack; | |
984 | } cacc; | |
ad8fec17 | 985 | |
d9e2e410 | 986 | struct { |
eacf078c | 987 | __u32 last_rtx_chunks; |
d9e2e410 XL |
988 | __u16 pmtu; |
989 | __u16 probe_size; | |
990 | __u16 probe_high; | |
0dac127c XL |
991 | __u8 probe_count:3; |
992 | __u8 raise_count:5; | |
d9e2e410 XL |
993 | __u8 state; |
994 | } pl; /* plpmtud related */ | |
995 | ||
ad8fec17 SS |
996 | /* 64-bit random number sent with heartbeat. */ |
997 | __u64 hb_nonce; | |
45122ca2 TG |
998 | |
999 | struct rcu_head rcu; | |
1da177e4 LT |
1000 | }; |
1001 | ||
89bf3450 | 1002 | struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, |
dd0fc66f | 1003 | gfp_t); |
1da177e4 LT |
1004 | void sctp_transport_set_owner(struct sctp_transport *, |
1005 | struct sctp_association *); | |
1006 | void sctp_transport_route(struct sctp_transport *, union sctp_addr *, | |
1007 | struct sctp_sock *); | |
9914ae3c | 1008 | void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); |
1da177e4 | 1009 | void sctp_transport_free(struct sctp_transport *); |
ba6f5e33 MRL |
1010 | void sctp_transport_reset_t3_rtx(struct sctp_transport *); |
1011 | void sctp_transport_reset_hb_timer(struct sctp_transport *); | |
7b9438de | 1012 | void sctp_transport_reset_reconf_timer(struct sctp_transport *transport); |
92548ec2 | 1013 | void sctp_transport_reset_probe_timer(struct sctp_transport *transport); |
1eed6779 | 1014 | int sctp_transport_hold(struct sctp_transport *); |
1da177e4 LT |
1015 | void sctp_transport_put(struct sctp_transport *); |
1016 | void sctp_transport_update_rto(struct sctp_transport *, __u32); | |
1017 | void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); | |
233e7936 XL |
1018 | void sctp_transport_lower_cwnd(struct sctp_transport *t, |
1019 | enum sctp_lower_cwnd reason); | |
46d5a808 VY |
1020 | void sctp_transport_burst_limited(struct sctp_transport *); |
1021 | void sctp_transport_burst_reset(struct sctp_transport *); | |
1da177e4 | 1022 | unsigned long sctp_transport_timeout(struct sctp_transport *); |
3ebfdf08 | 1023 | void sctp_transport_reset(struct sctp_transport *t); |
b6c5734d | 1024 | bool sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu); |
ddc4bbee | 1025 | void sctp_transport_immediate_rtx(struct sctp_transport *); |
c86a773c JA |
1026 | void sctp_transport_dst_release(struct sctp_transport *t); |
1027 | void sctp_transport_dst_confirm(struct sctp_transport *t); | |
058e6e0e XL |
1028 | bool sctp_transport_pl_send(struct sctp_transport *t); |
1029 | bool sctp_transport_pl_recv(struct sctp_transport *t); | |
1da177e4 LT |
1030 | |
1031 | ||
1032 | /* This is the structure we use to queue packets as they come into | |
1033 | * SCTP. We write packets to it and read chunks from it. | |
1034 | */ | |
1035 | struct sctp_inq { | |
1036 | /* This is actually a queue of sctp_chunk each | |
1037 | * containing a partially decoded packet. | |
1038 | */ | |
79af02c2 | 1039 | struct list_head in_chunk_list; |
1da177e4 LT |
1040 | /* This is the packet which is currently off the in queue and is |
1041 | * being worked on through the inbound chunk processing. | |
1042 | */ | |
1043 | struct sctp_chunk *in_progress; | |
1044 | ||
1045 | /* This is the delayed task to finish delivering inbound | |
1046 | * messages. | |
1047 | */ | |
1048 | struct work_struct immediate; | |
1da177e4 LT |
1049 | }; |
1050 | ||
1051 | void sctp_inq_init(struct sctp_inq *); | |
1052 | void sctp_inq_free(struct sctp_inq *); | |
1053 | void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); | |
1054 | struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); | |
bbd0d598 | 1055 | struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); |
c4028958 | 1056 | void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); |
1da177e4 LT |
1057 | |
1058 | /* This is the structure we use to hold outbound chunks. You push | |
1059 | * chunks in and they automatically pop out the other end as bundled | |
1060 | * packets (it calls (*output_handler)()). | |
1061 | * | |
1062 | * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, | |
1063 | * and 8.2 of the v13 draft. | |
1064 | * | |
1065 | * It handles retransmissions. The connection to the timeout portion | |
1066 | * of the state machine is through sctp_..._timeout() and timeout_handler. | |
1067 | * | |
1068 | * If you feed it SACKs, it will eat them. | |
1069 | * | |
1070 | * If you give it big chunks, it will fragment them. | |
1071 | * | |
1072 | * It assigns TSN's to data chunks. This happens at the last possible | |
1073 | * instant before transmission. | |
1074 | * | |
1075 | * When free()'d, it empties itself out via output_handler(). | |
1076 | */ | |
1077 | struct sctp_outq { | |
1078 | struct sctp_association *asoc; | |
1079 | ||
1080 | /* Data pending that has never been transmitted. */ | |
79af02c2 | 1081 | struct list_head out_chunk_list; |
1da177e4 | 1082 | |
5bbbbe32 MRL |
1083 | /* Stream scheduler being used */ |
1084 | struct sctp_sched_ops *sched; | |
1085 | ||
95c96174 | 1086 | unsigned int out_qlen; /* Total length of queued data chunks. */ |
1da177e4 LT |
1087 | |
1088 | /* Error of send failed, may used in SCTP_SEND_FAILED event. */ | |
95c96174 | 1089 | unsigned int error; |
1da177e4 LT |
1090 | |
1091 | /* These are control chunks we want to send. */ | |
79af02c2 | 1092 | struct list_head control_chunk_list; |
1da177e4 LT |
1093 | |
1094 | /* These are chunks that have been sacked but are above the | |
1095 | * CTSN, or cumulative tsn ack point. | |
1096 | */ | |
1097 | struct list_head sacked; | |
1098 | ||
1099 | /* Put chunks on this list to schedule them for | |
1100 | * retransmission. | |
1101 | */ | |
1102 | struct list_head retransmit; | |
1103 | ||
1104 | /* Put chunks on this list to save them for FWD TSN processing as | |
1105 | * they were abandoned. | |
1106 | */ | |
1107 | struct list_head abandoned; | |
1108 | ||
1109 | /* How many unackd bytes do we have in-flight? */ | |
1110 | __u32 outstanding_bytes; | |
1111 | ||
62aeaff5 VY |
1112 | /* Are we doing fast-rtx on this queue */ |
1113 | char fast_rtx; | |
1114 | ||
1da177e4 LT |
1115 | /* Corked? */ |
1116 | char cork; | |
1da177e4 LT |
1117 | }; |
1118 | ||
1119 | void sctp_outq_init(struct sctp_association *, struct sctp_outq *); | |
1120 | void sctp_outq_teardown(struct sctp_outq *); | |
1121 | void sctp_outq_free(struct sctp_outq*); | |
83dbc3d4 | 1122 | void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); |
edfee033 | 1123 | int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); |
1da177e4 LT |
1124 | int sctp_outq_is_empty(const struct sctp_outq *); |
1125 | void sctp_outq_restart(struct sctp_outq *); | |
1126 | ||
125c2982 XL |
1127 | void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport, |
1128 | enum sctp_retransmit_reason reason); | |
1da177e4 | 1129 | void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); |
83dbc3d4 | 1130 | void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); |
8dbdf1f5 XL |
1131 | void sctp_prsctp_prune(struct sctp_association *asoc, |
1132 | struct sctp_sndrcvinfo *sinfo, int msg_len); | |
8e0c3b73 | 1133 | void sctp_generate_fwdtsn(struct sctp_outq *q, __u32 sack_ctsn); |
1da177e4 LT |
1134 | /* Uncork and flush an outqueue. */ |
1135 | static inline void sctp_outq_cork(struct sctp_outq *q) | |
1136 | { | |
1137 | q->cork = 1; | |
1138 | } | |
1139 | ||
9e238323 MRL |
1140 | /* SCTP skb control block. |
1141 | * sctp_input_cb is currently used on rx and sock rx queue | |
1142 | */ | |
1143 | struct sctp_input_cb { | |
0356010d XL |
1144 | union { |
1145 | struct inet_skb_parm h4; | |
1146 | #if IS_ENABLED(CONFIG_IPV6) | |
1147 | struct inet6_skb_parm h6; | |
1148 | #endif | |
1149 | } header; | |
9e238323 | 1150 | struct sctp_chunk *chunk; |
e7487c86 | 1151 | struct sctp_af *af; |
a1dd2cf2 | 1152 | __be16 encap_port; |
9e238323 MRL |
1153 | }; |
1154 | #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) | |
1155 | ||
99519122 XL |
1156 | struct sctp_output_cb { |
1157 | struct sk_buff *last; | |
1158 | }; | |
1159 | #define SCTP_OUTPUT_CB(__skb) ((struct sctp_output_cb *)&((__skb)->cb[0])) | |
1160 | ||
1f45f78f MRL |
1161 | static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) |
1162 | { | |
1163 | const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; | |
1164 | ||
1165 | return chunk->head_skb ? : skb; | |
1166 | } | |
1167 | ||
1da177e4 LT |
1168 | /* These bind address data fields common between endpoints and associations */ |
1169 | struct sctp_bind_addr { | |
1170 | ||
1171 | /* RFC 2960 12.1 Parameters necessary for the SCTP instance | |
1172 | * | |
1173 | * SCTP Port: The local SCTP port number the endpoint is | |
1174 | * bound to. | |
1175 | */ | |
1176 | __u16 port; | |
1177 | ||
1178 | /* RFC 2960 12.1 Parameters necessary for the SCTP instance | |
1179 | * | |
1180 | * Address List: The list of IP addresses that this instance | |
1181 | * has bound. This information is passed to one's | |
1182 | * peer(s) in INIT and INIT ACK chunks. | |
1183 | */ | |
1184 | struct list_head address_list; | |
1da177e4 LT |
1185 | }; |
1186 | ||
1187 | void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); | |
1188 | void sctp_bind_addr_free(struct sctp_bind_addr *); | |
4db67e80 | 1189 | int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, |
1da177e4 | 1190 | const struct sctp_bind_addr *src, |
1c662018 | 1191 | enum sctp_scope scope, gfp_t gfp, |
3182cd84 | 1192 | int flags); |
8e71a11c VY |
1193 | int sctp_bind_addr_dup(struct sctp_bind_addr *dest, |
1194 | const struct sctp_bind_addr *src, | |
1195 | gfp_t gfp); | |
1da177e4 | 1196 | int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, |
133800d1 | 1197 | int new_size, __u8 addr_state, gfp_t gfp); |
0ed90fb0 | 1198 | int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); |
1da177e4 LT |
1199 | int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, |
1200 | struct sctp_sock *); | |
7dab83de VY |
1201 | int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, |
1202 | struct sctp_sock *, struct sctp_sock *); | |
75205f47 VY |
1203 | int sctp_bind_addr_state(const struct sctp_bind_addr *bp, |
1204 | const union sctp_addr *addr); | |
76c6d988 XL |
1205 | int sctp_bind_addrs_check(struct sctp_sock *sp, |
1206 | struct sctp_sock *sp2, int cnt2); | |
1da177e4 LT |
1207 | union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, |
1208 | const union sctp_addr *addrs, | |
1209 | int addrcnt, | |
1210 | struct sctp_sock *opt); | |
1211 | union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, | |
3182cd84 | 1212 | int *addrs_len, |
dd0fc66f | 1213 | gfp_t gfp); |
1da177e4 | 1214 | int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, |
dd0fc66f | 1215 | __u16 port, gfp_t gfp); |
1da177e4 | 1216 | |
1c662018 XL |
1217 | enum sctp_scope sctp_scope(const union sctp_addr *addr); |
1218 | int sctp_in_scope(struct net *net, const union sctp_addr *addr, | |
1219 | const enum sctp_scope scope); | |
52cae8f0 | 1220 | int sctp_is_any(struct sock *sk, const union sctp_addr *addr); |
9f7d653b | 1221 | int sctp_is_ep_boundall(struct sock *sk); |
1da177e4 LT |
1222 | |
1223 | ||
1224 | /* What type of endpoint? */ | |
74439f34 | 1225 | enum sctp_endpoint_type { |
1da177e4 LT |
1226 | SCTP_EP_TYPE_SOCKET, |
1227 | SCTP_EP_TYPE_ASSOCIATION, | |
74439f34 | 1228 | }; |
1da177e4 LT |
1229 | |
1230 | /* | |
1231 | * A common base class to bridge the implmentation view of a | |
1232 | * socket (usually listening) endpoint versus an association's | |
1233 | * local endpoint. | |
1234 | * This common structure is useful for several purposes: | |
1235 | * 1) Common interface for lookup routines. | |
1236 | * a) Subfunctions work for either endpoint or association | |
1237 | * b) Single interface to lookup allows hiding the lookup lock rather | |
1238 | * than acquiring it externally. | |
1239 | * 2) Common interface for the inbound chunk handling/state machine. | |
1240 | * 3) Common object handling routines for reference counting, etc. | |
1241 | * 4) Disentangle association lookup from endpoint lookup, where we | |
1242 | * do not have to find our endpoint to find our association. | |
1243 | * | |
1244 | */ | |
1245 | ||
1246 | struct sctp_ep_common { | |
1247 | /* Fields to help us manage our entries in the hash tables. */ | |
d970dbf8 | 1248 | struct hlist_node node; |
1da177e4 LT |
1249 | int hashent; |
1250 | ||
1251 | /* Runtime type information. What kind of endpoint is this? */ | |
74439f34 | 1252 | enum sctp_endpoint_type type; |
1da177e4 LT |
1253 | |
1254 | /* Some fields to help us manage this object. | |
1255 | * refcnt - Reference count access to this object. | |
1256 | * dead - Do not attempt to use this object. | |
1da177e4 | 1257 | */ |
c638457a | 1258 | refcount_t refcnt; |
0022d2dd | 1259 | bool dead; |
1da177e4 LT |
1260 | |
1261 | /* What socket does this endpoint belong to? */ | |
1262 | struct sock *sk; | |
1263 | ||
31243461 XL |
1264 | /* Cache netns and it won't change once set */ |
1265 | struct net *net; | |
1266 | ||
1da177e4 LT |
1267 | /* This is where we receive inbound chunks. */ |
1268 | struct sctp_inq inqueue; | |
1269 | ||
1270 | /* This substructure includes the defining parameters of the | |
1271 | * endpoint: | |
1272 | * bind_addr.port is our shared port number. | |
1273 | * bind_addr.address_list is our set of local IP addresses. | |
1274 | */ | |
1275 | struct sctp_bind_addr bind_addr; | |
1da177e4 LT |
1276 | }; |
1277 | ||
1278 | ||
1279 | /* RFC Section 1.4 Key Terms | |
1280 | * | |
1281 | * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a | |
1282 | * multi-homed host, an SCTP endpoint is represented to its peers as a | |
1283 | * combination of a set of eligible destination transport addresses to | |
1284 | * which SCTP packets can be sent and a set of eligible source | |
1285 | * transport addresses from which SCTP packets can be received. | |
1286 | * All transport addresses used by an SCTP endpoint must use the | |
1287 | * same port number, but can use multiple IP addresses. A transport | |
1288 | * address used by an SCTP endpoint must not be used by another | |
1289 | * SCTP endpoint. In other words, a transport address is unique | |
1290 | * to an SCTP endpoint. | |
1291 | * | |
1292 | * From an implementation perspective, each socket has one of these. | |
1293 | * A TCP-style socket will have exactly one association on one of | |
1294 | * these. An UDP-style socket will have multiple associations hanging | |
1295 | * off one of these. | |
1296 | */ | |
1297 | ||
1298 | struct sctp_endpoint { | |
1299 | /* Common substructure for endpoint and association. */ | |
1300 | struct sctp_ep_common base; | |
1301 | ||
1302 | /* Associations: A list of current associations and mappings | |
1303 | * to the data consumers for each association. This | |
1304 | * may be in the form of a hash table or other | |
1305 | * implementation dependent structure. The data | |
1306 | * consumers may be process identification | |
1307 | * information such as file descriptors, named pipe | |
1308 | * pointer, or table pointers dependent on how SCTP | |
1309 | * is implemented. | |
1310 | */ | |
1311 | /* This is really a list of struct sctp_association entries. */ | |
1312 | struct list_head asocs; | |
1313 | ||
1314 | /* Secret Key: A secret key used by this endpoint to compute | |
1315 | * the MAC. This SHOULD be a cryptographic quality | |
1316 | * random number with a sufficient length. | |
1317 | * Discussion in [RFC1750] can be helpful in | |
1318 | * selection of the key. | |
1319 | */ | |
570617e7 | 1320 | __u8 secret_key[SCTP_SECRET_SIZE]; |
1da177e4 | 1321 | |
313e7b4d VY |
1322 | /* digest: This is a digest of the sctp cookie. This field is |
1323 | * only used on the receive path when we try to validate | |
1324 | * that the cookie has not been tampered with. We put | |
1325 | * this here so we pre-allocate this once and can re-use | |
1326 | * on every receive. | |
1327 | */ | |
b68dbcab | 1328 | __u8 *digest; |
313e7b4d | 1329 | |
4eb701df NH |
1330 | /* sendbuf acct. policy. */ |
1331 | __u32 sndbuf_policy; | |
049b3ff5 NH |
1332 | |
1333 | /* rcvbuf acct. policy. */ | |
1334 | __u32 rcvbuf_policy; | |
1f485649 VY |
1335 | |
1336 | /* SCTP AUTH: array of the HMACs that will be allocated | |
1337 | * we need this per association so that we don't serialize | |
1338 | */ | |
5821c769 | 1339 | struct crypto_shash **auth_hmacs; |
1f485649 VY |
1340 | |
1341 | /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ | |
1342 | struct sctp_hmac_algo_param *auth_hmacs_list; | |
1343 | ||
1344 | /* SCTP-AUTH: chunks to authenticate encoded into parameter */ | |
1345 | struct sctp_chunks_param *auth_chunk_list; | |
1346 | ||
1347 | /* SCTP-AUTH: endpoint shared keys */ | |
1348 | struct list_head endpoint_shared_keys; | |
1349 | __u16 active_key_id; | |
1b0b8114 XL |
1350 | __u8 ecn_enable:1, |
1351 | auth_enable:1, | |
e55f4b8b | 1352 | intl_enable:1, |
c28445c3 | 1353 | prsctp_enable:1, |
4e27428f | 1354 | asconf_enable:1, |
c28445c3 | 1355 | reconf_enable:1; |
9fb657ae XL |
1356 | |
1357 | __u8 strreset_enable; | |
2277c7cd RH |
1358 | |
1359 | /* Security identifiers from incoming (INIT). These are set by | |
1360 | * security_sctp_assoc_request(). These will only be used by | |
1361 | * SCTP TCP type sockets and peeled off connections as they | |
1362 | * cause a new socket to be generated. security_sctp_sk_clone() | |
1363 | * will then plug these into the new socket. | |
1364 | */ | |
1365 | ||
1366 | u32 secid; | |
1367 | u32 peer_secid; | |
b88e1553 | 1368 | struct rcu_head rcu; |
1da177e4 LT |
1369 | }; |
1370 | ||
1371 | /* Recover the outter endpoint structure. */ | |
1372 | static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) | |
1373 | { | |
1374 | struct sctp_endpoint *ep; | |
1375 | ||
1376 | ep = container_of(base, struct sctp_endpoint, base); | |
1377 | return ep; | |
1378 | } | |
1379 | ||
1380 | /* These are function signatures for manipulating endpoints. */ | |
dd0fc66f | 1381 | struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); |
1da177e4 LT |
1382 | void sctp_endpoint_free(struct sctp_endpoint *); |
1383 | void sctp_endpoint_put(struct sctp_endpoint *); | |
b88e1553 | 1384 | int sctp_endpoint_hold(struct sctp_endpoint *ep); |
1da177e4 LT |
1385 | void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); |
1386 | struct sctp_association *sctp_endpoint_lookup_assoc( | |
1387 | const struct sctp_endpoint *ep, | |
1388 | const union sctp_addr *paddr, | |
1389 | struct sctp_transport **); | |
53066538 XL |
1390 | bool sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep, |
1391 | const union sctp_addr *paddr); | |
1da177e4 | 1392 | struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, |
4cdadcbc | 1393 | struct net *, const union sctp_addr *); |
53066538 XL |
1394 | bool sctp_has_association(struct net *net, const union sctp_addr *laddr, |
1395 | const union sctp_addr *paddr); | |
1da177e4 | 1396 | |
b14878cc VY |
1397 | int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, |
1398 | const struct sctp_association *asoc, | |
01a992be | 1399 | enum sctp_cid cid, struct sctp_init_chunk *peer_init, |
f53b5b09 | 1400 | struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); |
de6becdc | 1401 | int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, |
1da177e4 | 1402 | const union sctp_addr *peer, |
01a992be | 1403 | struct sctp_init_chunk *init, gfp_t gfp); |
1da177e4 LT |
1404 | __u32 sctp_generate_tag(const struct sctp_endpoint *); |
1405 | __u32 sctp_generate_tsn(const struct sctp_endpoint *); | |
1406 | ||
e1857ea2 AV |
1407 | struct sctp_inithdr_host { |
1408 | __u32 init_tag; | |
1409 | __u32 a_rwnd; | |
1410 | __u16 num_outbound_streams; | |
1411 | __u16 num_inbound_streams; | |
1412 | __u32 initial_tsn; | |
1413 | }; | |
1da177e4 | 1414 | |
637784ad MRL |
1415 | struct sctp_stream_priorities { |
1416 | /* List of priorities scheduled */ | |
1417 | struct list_head prio_sched; | |
1418 | /* List of streams scheduled */ | |
1419 | struct list_head active; | |
d86f9868 | 1420 | /* The next stream in line */ |
637784ad MRL |
1421 | struct sctp_stream_out_ext *next; |
1422 | __u16 prio; | |
1423 | }; | |
1424 | ||
f952be79 MRL |
1425 | struct sctp_stream_out_ext { |
1426 | __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; | |
1427 | __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; | |
5bbbbe32 | 1428 | struct list_head outq; /* chunks enqueued by this stream */ |
637784ad MRL |
1429 | union { |
1430 | struct { | |
1431 | /* Scheduled streams list */ | |
1432 | struct list_head prio_list; | |
1433 | struct sctp_stream_priorities *prio_head; | |
1434 | }; | |
ac1ed8b8 MRL |
1435 | /* Fields used by RR scheduler */ |
1436 | struct { | |
1437 | struct list_head rr_list; | |
1438 | }; | |
637784ad | 1439 | }; |
f952be79 MRL |
1440 | }; |
1441 | ||
a8386317 | 1442 | struct sctp_stream_out { |
668c9beb XL |
1443 | union { |
1444 | __u32 mid; | |
1445 | __u16 ssn; | |
1446 | }; | |
13228238 | 1447 | __u32 mid_uo; |
f952be79 | 1448 | struct sctp_stream_out_ext *ext; |
13228238 | 1449 | __u8 state; |
a8386317 XL |
1450 | }; |
1451 | ||
1452 | struct sctp_stream_in { | |
9d4ceaf1 XL |
1453 | union { |
1454 | __u32 mid; | |
1455 | __u16 ssn; | |
1456 | }; | |
13228238 | 1457 | __u32 mid_uo; |
9d4ceaf1 | 1458 | __u32 fsn; |
13228238 | 1459 | __u32 fsn_uo; |
bd4d627d | 1460 | char pd_mode; |
13228238 | 1461 | char pd_mode_uo; |
a8386317 XL |
1462 | }; |
1463 | ||
1464 | struct sctp_stream { | |
2075e50c KO |
1465 | GENRADIX(struct sctp_stream_out) out; |
1466 | GENRADIX(struct sctp_stream_in) in; | |
1467 | ||
a8386317 XL |
1468 | __u16 outcnt; |
1469 | __u16 incnt; | |
5bbbbe32 MRL |
1470 | /* Current stream being sent, if any */ |
1471 | struct sctp_stream_out *out_curr; | |
637784ad MRL |
1472 | union { |
1473 | /* Fields used by priority scheduler */ | |
1474 | struct { | |
1475 | /* List of priorities scheduled */ | |
1476 | struct list_head prio_list; | |
1477 | }; | |
ac1ed8b8 MRL |
1478 | /* Fields used by RR scheduler */ |
1479 | struct { | |
1480 | /* List of streams scheduled */ | |
1481 | struct list_head rr_list; | |
d86f9868 | 1482 | /* The next stream in line */ |
ac1ed8b8 MRL |
1483 | struct sctp_stream_out_ext *rr_next; |
1484 | }; | |
637784ad | 1485 | }; |
0c3f6f65 | 1486 | struct sctp_stream_interleave *si; |
a8386317 XL |
1487 | }; |
1488 | ||
05364ca0 | 1489 | static inline struct sctp_stream_out *sctp_stream_out( |
2075e50c | 1490 | struct sctp_stream *stream, |
05364ca0 KK |
1491 | __u16 sid) |
1492 | { | |
2075e50c | 1493 | return genradix_ptr(&stream->out, sid); |
05364ca0 KK |
1494 | } |
1495 | ||
1496 | static inline struct sctp_stream_in *sctp_stream_in( | |
2075e50c | 1497 | struct sctp_stream *stream, |
05364ca0 KK |
1498 | __u16 sid) |
1499 | { | |
2075e50c | 1500 | return genradix_ptr(&stream->in, sid); |
05364ca0 KK |
1501 | } |
1502 | ||
1503 | #define SCTP_SO(s, i) sctp_stream_out((s), (i)) | |
1504 | #define SCTP_SI(s, i) sctp_stream_in((s), (i)) | |
1505 | ||
a8386317 XL |
1506 | #define SCTP_STREAM_CLOSED 0x00 |
1507 | #define SCTP_STREAM_OPEN 0x01 | |
1508 | ||
0c3f6f65 XL |
1509 | static inline __u16 sctp_datachk_len(const struct sctp_stream *stream) |
1510 | { | |
1511 | return stream->si->data_chunk_len; | |
1512 | } | |
1513 | ||
1514 | static inline __u16 sctp_datahdr_len(const struct sctp_stream *stream) | |
1515 | { | |
1516 | return stream->si->data_chunk_len - sizeof(struct sctp_chunkhdr); | |
1517 | } | |
1518 | ||
0fc2ea92 XL |
1519 | static inline __u16 sctp_ftsnchk_len(const struct sctp_stream *stream) |
1520 | { | |
1521 | return stream->si->ftsn_chunk_len; | |
1522 | } | |
1523 | ||
1524 | static inline __u16 sctp_ftsnhdr_len(const struct sctp_stream *stream) | |
1525 | { | |
1526 | return stream->si->ftsn_chunk_len - sizeof(struct sctp_chunkhdr); | |
1527 | } | |
1528 | ||
196d6759 MB |
1529 | /* SCTP_GET_ASSOC_STATS counters */ |
1530 | struct sctp_priv_assoc_stats { | |
1531 | /* Maximum observed rto in the association during subsequent | |
1532 | * observations. Value is set to 0 if no RTO measurement took place | |
1533 | * The transport where the max_rto was observed is returned in | |
1534 | * obs_rto_ipaddr | |
1535 | */ | |
1536 | struct sockaddr_storage obs_rto_ipaddr; | |
1537 | __u64 max_obs_rto; | |
1538 | /* Total In and Out SACKs received and sent */ | |
1539 | __u64 isacks; | |
1540 | __u64 osacks; | |
1541 | /* Total In and Out packets received and sent */ | |
1542 | __u64 opackets; | |
1543 | __u64 ipackets; | |
1544 | /* Total retransmitted chunks */ | |
1545 | __u64 rtxchunks; | |
1546 | /* TSN received > next expected */ | |
1547 | __u64 outofseqtsns; | |
1548 | /* Duplicate Chunks received */ | |
1549 | __u64 idupchunks; | |
1550 | /* Gap Ack Blocks received */ | |
1551 | __u64 gapcnt; | |
1552 | /* Unordered data chunks sent and received */ | |
1553 | __u64 ouodchunks; | |
1554 | __u64 iuodchunks; | |
1555 | /* Ordered data chunks sent and received */ | |
1556 | __u64 oodchunks; | |
1557 | __u64 iodchunks; | |
1558 | /* Control chunks sent and received */ | |
1559 | __u64 octrlchunks; | |
1560 | __u64 ictrlchunks; | |
1561 | }; | |
1562 | ||
1da177e4 LT |
1563 | /* RFC2960 |
1564 | * | |
1565 | * 12. Recommended Transmission Control Block (TCB) Parameters | |
1566 | * | |
1567 | * This section details a recommended set of parameters that should | |
1568 | * be contained within the TCB for an implementation. This section is | |
1569 | * for illustrative purposes and should not be deemed as requirements | |
1570 | * on an implementation or as an exhaustive list of all parameters | |
1571 | * inside an SCTP TCB. Each implementation may need its own additional | |
1572 | * parameters for optimization. | |
1573 | */ | |
1574 | ||
1575 | ||
1576 | /* Here we have information about each individual association. */ | |
1577 | struct sctp_association { | |
1578 | ||
1579 | /* A base structure common to endpoint and association. | |
1580 | * In this context, it represents the associations's view | |
1581 | * of the local endpoint of the association. | |
1582 | */ | |
1583 | struct sctp_ep_common base; | |
1584 | ||
1585 | /* Associations on the same socket. */ | |
1586 | struct list_head asocs; | |
1587 | ||
1588 | /* association id. */ | |
1589 | sctp_assoc_t assoc_id; | |
1590 | ||
1591 | /* This is our parent endpoint. */ | |
1592 | struct sctp_endpoint *ep; | |
1593 | ||
1594 | /* These are those association elements needed in the cookie. */ | |
1595 | struct sctp_cookie c; | |
1596 | ||
1597 | /* This is all information about our peer. */ | |
1598 | struct { | |
1da177e4 LT |
1599 | /* transport_addr_list |
1600 | * | |
1601 | * Peer : A list of SCTP transport addresses that the | |
1602 | * Transport : peer is bound to. This information is derived | |
1603 | * Address : from the INIT or INIT ACK and is used to | |
1604 | * List : associate an inbound packet with a given | |
1605 | * : association. Normally this information is | |
1606 | * : hashed or keyed for quick lookup and access | |
1607 | * : of the TCB. | |
3f7a87d2 FF |
1608 | * : The list is also initialized with the list |
1609 | * : of addresses passed with the sctp_connectx() | |
1610 | * : call. | |
1da177e4 LT |
1611 | * |
1612 | * It is a list of SCTP_transport's. | |
1613 | */ | |
1614 | struct list_head transport_addr_list; | |
1615 | ||
be78cfcb | 1616 | /* rwnd |
1617 | * | |
1618 | * Peer Rwnd : Current calculated value of the peer's rwnd. | |
1619 | */ | |
1620 | __u32 rwnd; | |
1621 | ||
3f7a87d2 FF |
1622 | /* transport_count |
1623 | * | |
1624 | * Peer : A count of the number of peer addresses | |
1625 | * Transport : in the Peer Transport Address List. | |
1626 | * Address : | |
1627 | * Count : | |
1628 | */ | |
1629 | __u16 transport_count; | |
1630 | ||
1da177e4 LT |
1631 | /* port |
1632 | * The transport layer port number. | |
1633 | */ | |
1634 | __u16 port; | |
1635 | ||
1636 | /* primary_path | |
1637 | * | |
1638 | * Primary : This is the current primary destination | |
1639 | * Path : transport address of the peer endpoint. It | |
1640 | * : may also specify a source transport address | |
1641 | * : on this endpoint. | |
1642 | * | |
1643 | * All of these paths live on transport_addr_list. | |
1644 | * | |
1645 | * At the bakeoffs, we discovered that the intent of | |
1646 | * primaryPath is that it only changes when the ULP | |
1647 | * asks to have it changed. We add the activePath to | |
1648 | * designate the connection we are currently using to | |
1649 | * transmit new data and most control chunks. | |
1650 | */ | |
1651 | struct sctp_transport *primary_path; | |
1652 | ||
1653 | /* Cache the primary path address here, when we | |
1654 | * need a an address for msg_name. | |
1655 | */ | |
1656 | union sctp_addr primary_addr; | |
1657 | ||
1658 | /* active_path | |
1659 | * The path that we are currently using to | |
1660 | * transmit new data and most control chunks. | |
1661 | */ | |
1662 | struct sctp_transport *active_path; | |
1663 | ||
1664 | /* retran_path | |
1665 | * | |
1666 | * RFC2960 6.4 Multi-homed SCTP Endpoints | |
1667 | * ... | |
1668 | * Furthermore, when its peer is multi-homed, an | |
1669 | * endpoint SHOULD try to retransmit a chunk to an | |
1670 | * active destination transport address that is | |
1671 | * different from the last destination address to | |
1672 | * which the DATA chunk was sent. | |
1673 | */ | |
1674 | struct sctp_transport *retran_path; | |
1675 | ||
1676 | /* Pointer to last transport I have sent on. */ | |
1677 | struct sctp_transport *last_sent_to; | |
1678 | ||
1679 | /* This is the last transport I have received DATA on. */ | |
1680 | struct sctp_transport *last_data_from; | |
1681 | ||
1682 | /* | |
1683 | * Mapping An array of bits or bytes indicating which out of | |
1684 | * Array order TSN's have been received (relative to the | |
1685 | * Last Rcvd TSN). If no gaps exist, i.e. no out of | |
1686 | * order packets have been received, this array | |
1687 | * will be set to all zero. This structure may be | |
1688 | * in the form of a circular buffer or bit array. | |
1689 | * | |
1690 | * Last Rcvd : This is the last TSN received in | |
1691 | * TSN : sequence. This value is set initially by | |
1692 | * : taking the peer's Initial TSN, received in | |
1693 | * : the INIT or INIT ACK chunk, and subtracting | |
1694 | * : one from it. | |
1695 | * | |
1696 | * Throughout most of the specification this is called the | |
1697 | * "Cumulative TSN ACK Point". In this case, we | |
1698 | * ignore the advice in 12.2 in favour of the term | |
1699 | * used in the bulk of the text. This value is hidden | |
1700 | * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). | |
1701 | */ | |
1702 | struct sctp_tsnmap tsn_map; | |
1da177e4 | 1703 | |
be78cfcb | 1704 | /* This mask is used to disable sending the ASCONF chunk |
1705 | * with specified parameter to peer. | |
1706 | */ | |
1707 | __be16 addip_disabled_mask; | |
1708 | ||
1709 | /* These are capabilities which our peer advertised. */ | |
da1f6d4d | 1710 | __u16 ecn_capable:1, /* Can peer do ECN? */ |
be78cfcb | 1711 | ipv4_address:1, /* Peer understands IPv4 addresses? */ |
1712 | ipv6_address:1, /* Peer understands IPv6 addresses? */ | |
1713 | hostname_address:1, /* Peer understands DNS addresses? */ | |
1714 | asconf_capable:1, /* Does peer support ADDIP? */ | |
1715 | prsctp_capable:1, /* Can peer do PR-SCTP? */ | |
c28445c3 | 1716 | reconf_capable:1, /* Can peer do RE-CONFIG? */ |
da1f6d4d XL |
1717 | intl_capable:1, /* Can peer do INTERLEAVE */ |
1718 | auth_capable:1, /* Is peer doing SCTP-AUTH? */ | |
1719 | /* sack_needed: | |
1720 | * This flag indicates if the next received | |
1721 | * packet is to be responded to with a | |
1722 | * SACK. This is initialized to 0. When a packet | |
1723 | * is received sack_cnt is incremented. If this value | |
1724 | * reaches 2 or more, a SACK is sent and the | |
1725 | * value is reset to 0. Note: This is used only | |
1726 | * when no DATA chunks are received out of | |
1727 | * order. When DATA chunks are out of order, | |
1728 | * SACK's are not delayed (see Section 6). | |
1729 | */ | |
1730 | sack_needed:1, /* Do we need to sack the peer? */ | |
8a0d19c5 | 1731 | sack_generation:1, |
1732 | zero_window_announced:1; | |
da1f6d4d | 1733 | |
d364d927 | 1734 | __u32 sack_cnt; |
1da177e4 | 1735 | |
0f3fffd8 | 1736 | __u32 adaptation_ind; /* Adaptation Code point. */ |
1da177e4 | 1737 | |
e1857ea2 | 1738 | struct sctp_inithdr_host i; |
1da177e4 | 1739 | void *cookie; |
be78cfcb | 1740 | int cookie_len; |
1da177e4 LT |
1741 | |
1742 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. | |
1743 | * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the | |
1744 | * Initial TSN Value minus 1 | |
1745 | */ | |
1746 | __u32 addip_serial; | |
1f485649 VY |
1747 | |
1748 | /* SCTP-AUTH: We need to know pears random number, hmac list | |
1749 | * and authenticated chunk list. All that is part of the | |
1750 | * cookie and these are just pointers to those locations | |
1751 | */ | |
b02db702 | 1752 | struct sctp_random_param *peer_random; |
a762a9d9 | 1753 | struct sctp_chunks_param *peer_chunks; |
1474774a | 1754 | struct sctp_hmac_algo_param *peer_hmacs; |
1da177e4 LT |
1755 | } peer; |
1756 | ||
1757 | /* State : A state variable indicating what state the | |
1758 | * : association is in, i.e. COOKIE-WAIT, | |
1759 | * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, | |
1760 | * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. | |
1761 | * | |
1762 | * Note: No "CLOSED" state is illustrated since if a | |
1763 | * association is "CLOSED" its TCB SHOULD be removed. | |
1764 | * | |
1765 | * In this implementation we DO have a CLOSED | |
1766 | * state which is used during initiation and shutdown. | |
1767 | * | |
1768 | * State takes values from SCTP_STATE_*. | |
1769 | */ | |
52106019 | 1770 | enum sctp_state state; |
1da177e4 | 1771 | |
1da177e4 LT |
1772 | /* Overall : The overall association error count. |
1773 | * Error Count : [Clear this any time I get something.] | |
1774 | */ | |
1775 | int overall_error_count; | |
1776 | ||
be78cfcb | 1777 | /* The cookie life I award for any cookie. */ |
1778 | ktime_t cookie_life; | |
1779 | ||
1da177e4 LT |
1780 | /* These are the association's initial, max, and min RTO values. |
1781 | * These values will be initialized by system defaults, but can | |
1782 | * be modified via the SCTP_RTOINFO socket option. | |
1783 | */ | |
8116ffad VY |
1784 | unsigned long rto_initial; |
1785 | unsigned long rto_max; | |
1786 | unsigned long rto_min; | |
1da177e4 LT |
1787 | |
1788 | /* Maximum number of new data packets that can be sent in a burst. */ | |
1789 | int max_burst; | |
1790 | ||
1791 | /* This is the max_retrans value for the association. This value will | |
d86f9868 | 1792 | * be initialized from system defaults, but can be |
1da177e4 LT |
1793 | * modified by the SCTP_ASSOCINFO socket option. |
1794 | */ | |
1795 | int max_retrans; | |
1796 | ||
5aa93bcf NH |
1797 | /* This is the partially failed retrans value for the transport |
1798 | * and will be initialized from the assocs value. This can be | |
1799 | * changed using the SCTP_PEER_ADDR_THLDS socket option | |
1800 | */ | |
34515e94 XL |
1801 | __u16 pf_retrans; |
1802 | /* Used for primary path switchover. */ | |
1803 | __u16 ps_retrans; | |
5aa93bcf | 1804 | |
1da177e4 LT |
1805 | /* Maximum number of times the endpoint will retransmit INIT */ |
1806 | __u16 max_init_attempts; | |
1807 | ||
1808 | /* How many times have we resent an INIT? */ | |
1809 | __u16 init_retries; | |
1810 | ||
1811 | /* The largest timeout or RTO value to use in attempting an INIT */ | |
8116ffad | 1812 | unsigned long max_init_timeo; |
1da177e4 | 1813 | |
52ccb8e9 FF |
1814 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
1815 | * the destination address every heartbeat interval. This value | |
1816 | * will be inherited by all new transports. | |
1817 | */ | |
8116ffad | 1818 | unsigned long hbinterval; |
d1e462a7 | 1819 | unsigned long probe_interval; |
52ccb8e9 | 1820 | |
e8a3001c XL |
1821 | __be16 encap_port; |
1822 | ||
52ccb8e9 FF |
1823 | /* This is the max_retrans value for new transports in the |
1824 | * association. | |
1825 | */ | |
1826 | __u16 pathmaxrxt; | |
1827 | ||
8a9c58d2 XL |
1828 | __u32 flowlabel; |
1829 | __u8 dscp; | |
1830 | ||
8a479491 VY |
1831 | /* Flag that path mtu update is pending */ |
1832 | __u8 pmtu_pending; | |
1833 | ||
52ccb8e9 FF |
1834 | /* Association : The smallest PMTU discovered for all of the |
1835 | * PMTU : peer's transport addresses. | |
1836 | */ | |
1837 | __u32 pathmtu; | |
1838 | ||
f4ab2f72 | 1839 | /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
52ccb8e9 FF |
1840 | __u32 param_flags; |
1841 | ||
be78cfcb | 1842 | __u32 sackfreq; |
8116ffad VY |
1843 | /* SACK delay timeout */ |
1844 | unsigned long sackdelay; | |
8116ffad VY |
1845 | |
1846 | unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; | |
1da177e4 LT |
1847 | struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; |
1848 | ||
1849 | /* Transport to which SHUTDOWN chunk was last sent. */ | |
1850 | struct sctp_transport *shutdown_last_sent_to; | |
1851 | ||
3f7a87d2 FF |
1852 | /* Transport to which INIT chunk was last sent. */ |
1853 | struct sctp_transport *init_last_sent_to; | |
1854 | ||
be78cfcb | 1855 | /* How many times have we resent a SHUTDOWN */ |
1856 | int shutdown_retries; | |
1857 | ||
1da177e4 LT |
1858 | /* Next TSN : The next TSN number to be assigned to a new |
1859 | * : DATA chunk. This is sent in the INIT or INIT | |
1860 | * : ACK chunk to the peer and incremented each | |
1861 | * : time a DATA chunk is assigned a TSN | |
1862 | * : (normally just prior to transmit or during | |
1863 | * : fragmentation). | |
1864 | */ | |
1865 | __u32 next_tsn; | |
1866 | ||
1867 | /* | |
1868 | * Last Rcvd : This is the last TSN received in sequence. This value | |
1869 | * TSN : is set initially by taking the peer's Initial TSN, | |
1870 | * : received in the INIT or INIT ACK chunk, and | |
1871 | * : subtracting one from it. | |
1872 | * | |
1873 | * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. | |
1874 | */ | |
1875 | ||
1876 | __u32 ctsn_ack_point; | |
1877 | ||
1878 | /* PR-SCTP Advanced.Peer.Ack.Point */ | |
1879 | __u32 adv_peer_ack_point; | |
1880 | ||
1881 | /* Highest TSN that is acknowledged by incoming SACKs. */ | |
1882 | __u32 highest_sacked; | |
1883 | ||
cf9b4812 VY |
1884 | /* TSN marking the fast recovery exit point */ |
1885 | __u32 fast_recovery_exit; | |
1886 | ||
1887 | /* Flag to track the current fast recovery state */ | |
1888 | __u8 fast_recovery; | |
1889 | ||
1da177e4 LT |
1890 | /* The number of unacknowledged data chunks. Reported through |
1891 | * the SCTP_STATUS sockopt. | |
1892 | */ | |
1893 | __u16 unack_data; | |
1894 | ||
58fbbed4 NH |
1895 | /* The total number of data chunks that we've had to retransmit |
1896 | * as the result of a T3 timer expiration | |
1897 | */ | |
1898 | __u32 rtx_data_chunks; | |
1899 | ||
1da177e4 LT |
1900 | /* This is the association's receive buffer space. This value is used |
1901 | * to set a_rwnd field in an INIT or a SACK chunk. | |
1902 | */ | |
1903 | __u32 rwnd; | |
1904 | ||
1905 | /* This is the last advertised value of rwnd over a SACK chunk. */ | |
1906 | __u32 a_rwnd; | |
1907 | ||
362d5204 DB |
1908 | /* Number of bytes by which the rwnd has slopped. The rwnd is allowed |
1909 | * to slop over a maximum of the association's frag_point. | |
1910 | */ | |
1911 | __u32 rwnd_over; | |
1912 | ||
1913 | /* Keeps treack of rwnd pressure. This happens when we have | |
1914 | * a window, but not recevie buffer (i.e small packets). This one | |
1915 | * is releases slowly (1 PMTU at a time ). | |
1916 | */ | |
1917 | __u32 rwnd_press; | |
1918 | ||
1da177e4 LT |
1919 | /* This is the sndbuf size in use for the association. |
1920 | * This corresponds to the sndbuf size for the association, | |
1921 | * as specified in the sk->sndbuf. | |
1922 | */ | |
1923 | int sndbuf_used; | |
1924 | ||
049b3ff5 NH |
1925 | /* This is the amount of memory that this association has allocated |
1926 | * in the receive path at any given time. | |
1927 | */ | |
1928 | atomic_t rmem_alloc; | |
1929 | ||
1da177e4 LT |
1930 | /* This is the wait queue head for send requests waiting on |
1931 | * the association sndbuf space. | |
1932 | */ | |
1933 | wait_queue_head_t wait; | |
1934 | ||
1da177e4 LT |
1935 | /* The message size at which SCTP fragmentation will occur. */ |
1936 | __u32 frag_point; | |
f68b2e05 | 1937 | __u32 user_frag; |
1da177e4 | 1938 | |
3f7a87d2 FF |
1939 | /* Counter used to count INIT errors. */ |
1940 | int init_err_counter; | |
1941 | ||
1942 | /* Count the number of INIT cycles (for doubling timeout). */ | |
1943 | int init_cycle; | |
1da177e4 LT |
1944 | |
1945 | /* Default send parameters. */ | |
1946 | __u16 default_stream; | |
1947 | __u16 default_flags; | |
1948 | __u32 default_ppid; | |
1949 | __u32 default_context; | |
1950 | __u32 default_timetolive; | |
1951 | ||
6ab792f5 ISJ |
1952 | /* Default receive parameters */ |
1953 | __u32 default_rcv_context; | |
1954 | ||
a8386317 | 1955 | /* Stream arrays */ |
cee360ab | 1956 | struct sctp_stream stream; |
1da177e4 LT |
1957 | |
1958 | /* All outbound chunks go through this structure. */ | |
1959 | struct sctp_outq outqueue; | |
1960 | ||
1961 | /* A smart pipe that will handle reordering and fragmentation, | |
1962 | * as well as handle passing events up to the ULP. | |
1963 | */ | |
1964 | struct sctp_ulpq ulpq; | |
1965 | ||
1966 | /* Last TSN that caused an ECNE Chunk to be sent. */ | |
1967 | __u32 last_ecne_tsn; | |
1968 | ||
1969 | /* Last TSN that caused a CWR Chunk to be sent. */ | |
1970 | __u32 last_cwr_tsn; | |
1971 | ||
1972 | /* How many duplicated TSNs have we seen? */ | |
1973 | int numduptsns; | |
1974 | ||
1da177e4 LT |
1975 | /* These are to support |
1976 | * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses | |
1977 | * and Enforcement of Flow and Message Limits" | |
1978 | * <draft-ietf-tsvwg-addip-sctp-02.txt> | |
1979 | * or "ADDIP" for short. | |
1980 | */ | |
1981 | ||
1982 | ||
1983 | ||
1984 | /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks | |
1985 | * | |
1986 | * R1) One and only one ASCONF Chunk MAY be in transit and | |
1987 | * unacknowledged at any one time. If a sender, after sending | |
1988 | * an ASCONF chunk, decides it needs to transfer another | |
1989 | * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk | |
1990 | * returns from the previous ASCONF Chunk before sending a | |
1991 | * subsequent ASCONF. Note this restriction binds each side, | |
1992 | * so at any time two ASCONF may be in-transit on any given | |
1993 | * association (one sent from each endpoint). | |
1994 | * | |
1995 | * [This is our one-and-only-one ASCONF in flight. If we do | |
1996 | * not have an ASCONF in flight, this is NULL.] | |
1997 | */ | |
1998 | struct sctp_chunk *addip_last_asconf; | |
1999 | ||
a08de64d | 2000 | /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. |
1da177e4 | 2001 | * |
a08de64d VY |
2002 | * This is needed to implement itmes E1 - E4 of the updated |
2003 | * spec. Here is the justification: | |
1da177e4 | 2004 | * |
a08de64d VY |
2005 | * Since the peer may bundle multiple ASCONF chunks toward us, |
2006 | * we now need the ability to cache multiple ACKs. The section | |
2007 | * describes in detail how they are cached and cleaned up. | |
1da177e4 | 2008 | */ |
a08de64d | 2009 | struct list_head asconf_ack_list; |
1da177e4 LT |
2010 | |
2011 | /* These ASCONF chunks are waiting to be sent. | |
2012 | * | |
2013 | * These chunaks can't be pushed to outqueue until receiving | |
2014 | * ASCONF_ACK for the previous ASCONF indicated by | |
2015 | * addip_last_asconf, so as to guarantee that only one ASCONF | |
2016 | * is in flight at any time. | |
2017 | * | |
2018 | * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks | |
2019 | * | |
2020 | * In defining the ASCONF Chunk transfer procedures, it is | |
2021 | * essential that these transfers MUST NOT cause congestion | |
2022 | * within the network. To achieve this, we place these | |
2023 | * restrictions on the transfer of ASCONF Chunks: | |
2024 | * | |
2025 | * R1) One and only one ASCONF Chunk MAY be in transit and | |
2026 | * unacknowledged at any one time. If a sender, after sending | |
2027 | * an ASCONF chunk, decides it needs to transfer another | |
2028 | * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk | |
2029 | * returns from the previous ASCONF Chunk before sending a | |
2030 | * subsequent ASCONF. Note this restriction binds each side, | |
2031 | * so at any time two ASCONF may be in-transit on any given | |
2032 | * association (one sent from each endpoint). | |
2033 | * | |
2034 | * | |
2035 | * [I really think this is EXACTLY the sort of intelligence | |
2036 | * which already resides in sctp_outq. Please move this | |
2037 | * queue and its supporting logic down there. --piggy] | |
2038 | */ | |
79af02c2 | 2039 | struct list_head addip_chunk_list; |
1da177e4 LT |
2040 | |
2041 | /* ADDIP Section 4.1 ASCONF Chunk Procedures | |
2042 | * | |
2043 | * A2) A serial number should be assigned to the Chunk. The | |
2044 | * serial number SHOULD be a monotonically increasing | |
2045 | * number. The serial number SHOULD be initialized at | |
2046 | * the start of the association to the same value as the | |
2047 | * Initial TSN and every time a new ASCONF chunk is created | |
2048 | * it is incremented by one after assigning the serial number | |
2049 | * to the newly created chunk. | |
2050 | * | |
2051 | * ADDIP | |
2052 | * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) | |
2053 | * | |
2054 | * Serial Number : 32 bits (unsigned integer) | |
2055 | * | |
2056 | * This value represents a Serial Number for the ASCONF | |
2057 | * Chunk. The valid range of Serial Number is from 0 to | |
2058 | * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 | |
2059 | * after reaching 4294967295. | |
2060 | */ | |
2061 | __u32 addip_serial; | |
8a07eb0a | 2062 | int src_out_of_asoc_ok; |
be78cfcb | 2063 | union sctp_addr *asconf_addr_del_pending; |
6af29ccc | 2064 | struct sctp_transport *new_transport; |
1da177e4 | 2065 | |
1f485649 VY |
2066 | /* SCTP AUTH: list of the endpoint shared keys. These |
2067 | * keys are provided out of band by the user applicaton | |
2068 | * and can't change during the lifetime of the association | |
2069 | */ | |
2070 | struct list_head endpoint_shared_keys; | |
2071 | ||
2072 | /* SCTP AUTH: | |
2073 | * The current generated assocaition shared key (secret) | |
2074 | */ | |
2075 | struct sctp_auth_bytes *asoc_shared_key; | |
1b1e0bc9 | 2076 | struct sctp_shared_key *shkey; |
1f485649 VY |
2077 | |
2078 | /* SCTP AUTH: hmac id of the first peer requested algorithm | |
2079 | * that we support. | |
2080 | */ | |
2081 | __u16 default_hmac_id; | |
2082 | ||
2083 | __u16 active_key_id; | |
2084 | ||
9237ccbc | 2085 | __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ |
28aa4c26 | 2086 | temp:1, /* Is it a temporary association? */ |
aef587be | 2087 | pf_expose:2, /* Expose pf state? */ |
da1f6d4d | 2088 | force_delay:1; |
196d6759 | 2089 | |
9fb657ae | 2090 | __u8 strreset_enable; |
7f9d68ac | 2091 | __u8 strreset_outstanding; /* request param count on the fly */ |
9fb657ae | 2092 | |
cc16f00f XL |
2093 | __u32 strreset_outseq; /* Update after receiving response */ |
2094 | __u32 strreset_inseq; /* Update after receiving request */ | |
e4dc99c7 | 2095 | __u32 strreset_result[2]; /* save the results of last 2 responses */ |
cc16f00f | 2096 | |
7b9438de XL |
2097 | struct sctp_chunk *strreset_chunk; /* save request chunk */ |
2098 | ||
196d6759 | 2099 | struct sctp_priv_assoc_stats stats; |
826d253d | 2100 | |
8dbdf1f5 XL |
2101 | int sent_cnt_removable; |
2102 | ||
a1e3a059 XL |
2103 | __u16 subscribe; |
2104 | ||
826d253d XL |
2105 | __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; |
2106 | __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; | |
fb6df5a6 XL |
2107 | |
2108 | struct rcu_head rcu; | |
1da177e4 LT |
2109 | }; |
2110 | ||
2111 | ||
2112 | /* An eyecatcher for determining if we are really looking at an | |
2113 | * association data structure. | |
2114 | */ | |
2115 | enum { | |
2116 | SCTP_ASSOC_EYECATCHER = 0xa550c123, | |
2117 | }; | |
2118 | ||
2119 | /* Recover the outter association structure. */ | |
2120 | static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) | |
2121 | { | |
2122 | struct sctp_association *asoc; | |
2123 | ||
2124 | asoc = container_of(base, struct sctp_association, base); | |
2125 | return asoc; | |
2126 | } | |
2127 | ||
2128 | /* These are function signatures for manipulating associations. */ | |
2129 | ||
2130 | ||
2131 | struct sctp_association * | |
1c662018 XL |
2132 | sctp_association_new(const struct sctp_endpoint *ep, const struct sock *sk, |
2133 | enum sctp_scope scope, gfp_t gfp); | |
1da177e4 LT |
2134 | void sctp_association_free(struct sctp_association *); |
2135 | void sctp_association_put(struct sctp_association *); | |
2136 | void sctp_association_hold(struct sctp_association *); | |
2137 | ||
9919b455 WY |
2138 | struct sctp_transport *sctp_assoc_choose_alter_transport( |
2139 | struct sctp_association *, struct sctp_transport *); | |
1da177e4 LT |
2140 | void sctp_assoc_update_retran_path(struct sctp_association *); |
2141 | struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, | |
2142 | const union sctp_addr *); | |
2143 | int sctp_assoc_lookup_laddr(struct sctp_association *asoc, | |
2144 | const union sctp_addr *laddr); | |
2145 | struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, | |
2146 | const union sctp_addr *address, | |
dd0fc66f | 2147 | const gfp_t gfp, |
3f7a87d2 | 2148 | const int peer_state); |
1da177e4 LT |
2149 | void sctp_assoc_del_peer(struct sctp_association *asoc, |
2150 | const union sctp_addr *addr); | |
3f7a87d2 FF |
2151 | void sctp_assoc_rm_peer(struct sctp_association *asoc, |
2152 | struct sctp_transport *peer); | |
0ceaeebe XL |
2153 | void sctp_assoc_control_transport(struct sctp_association *asoc, |
2154 | struct sctp_transport *transport, | |
2155 | enum sctp_transport_cmd command, | |
2156 | sctp_sn_error_t error); | |
1da177e4 | 2157 | struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); |
1da177e4 | 2158 | void sctp_assoc_migrate(struct sctp_association *, struct sock *); |
5ee8aa68 XL |
2159 | int sctp_assoc_update(struct sctp_association *old, |
2160 | struct sctp_association *new); | |
1da177e4 LT |
2161 | |
2162 | __u32 sctp_association_get_next_tsn(struct sctp_association *); | |
2163 | ||
2f5e3c9d | 2164 | void sctp_assoc_update_frag_point(struct sctp_association *asoc); |
c4b2893d | 2165 | void sctp_assoc_set_pmtu(struct sctp_association *asoc, __u32 pmtu); |
3ebfdf08 | 2166 | void sctp_assoc_sync_pmtu(struct sctp_association *asoc); |
362d5204 DB |
2167 | void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); |
2168 | void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); | |
1da177e4 LT |
2169 | void sctp_assoc_set_primary(struct sctp_association *, |
2170 | struct sctp_transport *); | |
42e30bf3 VY |
2171 | void sctp_assoc_del_nonprimary_peers(struct sctp_association *, |
2172 | struct sctp_transport *); | |
1c662018 XL |
2173 | int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, |
2174 | enum sctp_scope scope, gfp_t gfp); | |
1da177e4 | 2175 | int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, |
3182cd84 | 2176 | struct sctp_cookie*, |
dd0fc66f | 2177 | gfp_t gfp); |
07d93967 | 2178 | int sctp_assoc_set_id(struct sctp_association *, gfp_t); |
a08de64d VY |
2179 | void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); |
2180 | struct sctp_chunk *sctp_assoc_lookup_asconf_ack( | |
2181 | const struct sctp_association *asoc, | |
2182 | __be32 serial); | |
a000c01e | 2183 | void sctp_asconf_queue_teardown(struct sctp_association *asoc); |
1da177e4 LT |
2184 | |
2185 | int sctp_cmp_addr_exact(const union sctp_addr *ss1, | |
2186 | const union sctp_addr *ss2); | |
2187 | struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); | |
2188 | ||
2189 | /* A convenience structure to parse out SCTP specific CMSGs. */ | |
a05437ac | 2190 | struct sctp_cmsgs { |
1da177e4 | 2191 | struct sctp_initmsg *init; |
63b94938 GOV |
2192 | struct sctp_sndrcvinfo *srinfo; |
2193 | struct sctp_sndinfo *sinfo; | |
ed63afb8 | 2194 | struct sctp_prinfo *prinfo; |
3ff547c0 | 2195 | struct sctp_authinfo *authinfo; |
2c0dbaa0 | 2196 | struct msghdr *addrs_msg; |
a05437ac | 2197 | }; |
1da177e4 LT |
2198 | |
2199 | /* Structure for tracking memory objects */ | |
d38ef5ae | 2200 | struct sctp_dbg_objcnt_entry { |
1da177e4 LT |
2201 | char *label; |
2202 | atomic_t *counter; | |
d38ef5ae | 2203 | }; |
1da177e4 LT |
2204 | |
2205 | #endif /* __sctp_structs_h__ */ |