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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * Copyright (c) 2001 Intel Corp. | |
6 | * | |
60c778b2 | 7 | * This file is part of the SCTP kernel implementation |
1da177e4 | 8 | * |
60c778b2 | 9 | * This SCTP implementation is free software; |
1da177e4 LT |
10 | * you can redistribute it and/or modify it under the terms of |
11 | * the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2, or (at your option) | |
13 | * any later version. | |
14 | * | |
60c778b2 | 15 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
16 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
17 | * ************************ | |
18 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
19 | * See the GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with GNU CC; see the file COPYING. If not, write to | |
23 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
24 | * Boston, MA 02111-1307, USA. | |
25 | * | |
26 | * Please send any bug reports or fixes you make to the | |
27 | * email address(es): | |
28 | * lksctp developers <lksctp-developers@lists.sourceforge.net> | |
29 | * | |
30 | * Or submit a bug report through the following website: | |
31 | * http://www.sf.net/projects/lksctp | |
32 | * | |
33 | * Written or modified by: | |
34 | * La Monte H.P. Yarroll <piggy@acm.org> | |
35 | * Karl Knutson <karl@athena.chicago.il.us> | |
36 | * Randall Stewart <randall@stewart.chicago.il.us> | |
37 | * Ken Morneau <kmorneau@cisco.com> | |
38 | * Qiaobing Xie <qxie1@motorola.com> | |
39 | * Xingang Guo <xingang.guo@intel.com> | |
40 | * Sridhar Samudrala <samudrala@us.ibm.com> | |
41 | * Daisy Chang <daisyc@us.ibm.com> | |
42 | * | |
43 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
44 | * be incorporated into the next SCTP release. | |
45 | */ | |
46 | ||
47 | #ifndef __sctp_constants_h__ | |
48 | #define __sctp_constants_h__ | |
49 | ||
1da177e4 LT |
50 | #include <linux/sctp.h> |
51 | #include <linux/ipv6.h> /* For ipv6hdr. */ | |
52 | #include <net/sctp/user.h> | |
c752f073 | 53 | #include <net/tcp_states.h> /* For TCP states used in sctp_sock_state_t */ |
1da177e4 LT |
54 | |
55 | /* Value used for stream negotiation. */ | |
56 | enum { SCTP_MAX_STREAM = 0xffff }; | |
57 | enum { SCTP_DEFAULT_OUTSTREAMS = 10 }; | |
58 | enum { SCTP_DEFAULT_INSTREAMS = SCTP_MAX_STREAM }; | |
59 | ||
60 | /* Since CIDs are sparse, we need all four of the following | |
61 | * symbols. CIDs are dense through SCTP_CID_BASE_MAX. | |
62 | */ | |
63 | #define SCTP_CID_BASE_MAX SCTP_CID_SHUTDOWN_COMPLETE | |
64 | #define SCTP_CID_MAX SCTP_CID_ASCONF_ACK | |
65 | ||
66 | #define SCTP_NUM_BASE_CHUNK_TYPES (SCTP_CID_BASE_MAX + 1) | |
1da177e4 LT |
67 | |
68 | #define SCTP_NUM_ADDIP_CHUNK_TYPES 2 | |
69 | ||
70 | #define SCTP_NUM_PRSCTP_CHUNK_TYPES 1 | |
71 | ||
1f485649 VY |
72 | #define SCTP_NUM_AUTH_CHUNK_TYPES 1 |
73 | ||
74 | #define SCTP_NUM_CHUNK_TYPES (SCTP_NUM_BASE_CHUNK_TYPES + \ | |
75 | SCTP_NUM_ADDIP_CHUNK_TYPES +\ | |
76 | SCTP_NUM_PRSCTP_CHUNK_TYPES +\ | |
77 | SCTP_NUM_AUTH_CHUNK_TYPES) | |
78 | ||
1da177e4 LT |
79 | /* These are the different flavours of event. */ |
80 | typedef enum { | |
81 | ||
82 | SCTP_EVENT_T_CHUNK = 1, | |
83 | SCTP_EVENT_T_TIMEOUT, | |
84 | SCTP_EVENT_T_OTHER, | |
85 | SCTP_EVENT_T_PRIMITIVE | |
86 | ||
87 | } sctp_event_t; | |
88 | ||
89 | #define SCTP_EVENT_T_MAX SCTP_EVENT_T_PRIMITIVE | |
90 | #define SCTP_EVENT_T_NUM (SCTP_EVENT_T_MAX + 1) | |
91 | ||
92 | /* As a convenience for the state machine, we append SCTP_EVENT_* and | |
93 | * SCTP_ULP_* to the list of possible chunks. | |
94 | */ | |
95 | ||
96 | typedef enum { | |
97 | SCTP_EVENT_TIMEOUT_NONE = 0, | |
98 | SCTP_EVENT_TIMEOUT_T1_COOKIE, | |
99 | SCTP_EVENT_TIMEOUT_T1_INIT, | |
100 | SCTP_EVENT_TIMEOUT_T2_SHUTDOWN, | |
101 | SCTP_EVENT_TIMEOUT_T3_RTX, | |
102 | SCTP_EVENT_TIMEOUT_T4_RTO, | |
103 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD, | |
104 | SCTP_EVENT_TIMEOUT_HEARTBEAT, | |
105 | SCTP_EVENT_TIMEOUT_SACK, | |
106 | SCTP_EVENT_TIMEOUT_AUTOCLOSE, | |
107 | } sctp_event_timeout_t; | |
108 | ||
109 | #define SCTP_EVENT_TIMEOUT_MAX SCTP_EVENT_TIMEOUT_AUTOCLOSE | |
110 | #define SCTP_NUM_TIMEOUT_TYPES (SCTP_EVENT_TIMEOUT_MAX + 1) | |
111 | ||
112 | typedef enum { | |
113 | SCTP_EVENT_NO_PENDING_TSN = 0, | |
114 | SCTP_EVENT_ICMP_PROTO_UNREACH, | |
115 | } sctp_event_other_t; | |
116 | ||
117 | #define SCTP_EVENT_OTHER_MAX SCTP_EVENT_ICMP_PROTO_UNREACH | |
118 | #define SCTP_NUM_OTHER_TYPES (SCTP_EVENT_OTHER_MAX + 1) | |
119 | ||
120 | /* These are primitive requests from the ULP. */ | |
121 | typedef enum { | |
122 | SCTP_PRIMITIVE_ASSOCIATE = 0, | |
123 | SCTP_PRIMITIVE_SHUTDOWN, | |
124 | SCTP_PRIMITIVE_ABORT, | |
125 | SCTP_PRIMITIVE_SEND, | |
126 | SCTP_PRIMITIVE_REQUESTHEARTBEAT, | |
127 | SCTP_PRIMITIVE_ASCONF, | |
128 | } sctp_event_primitive_t; | |
129 | ||
130 | #define SCTP_EVENT_PRIMITIVE_MAX SCTP_PRIMITIVE_ASCONF | |
131 | #define SCTP_NUM_PRIMITIVE_TYPES (SCTP_EVENT_PRIMITIVE_MAX + 1) | |
132 | ||
133 | /* We define here a utility type for manipulating subtypes. | |
134 | * The subtype constructors all work like this: | |
135 | * | |
136 | * sctp_subtype_t foo = SCTP_ST_CHUNK(SCTP_CID_INIT); | |
137 | */ | |
138 | ||
139 | typedef union { | |
140 | sctp_cid_t chunk; | |
141 | sctp_event_timeout_t timeout; | |
142 | sctp_event_other_t other; | |
143 | sctp_event_primitive_t primitive; | |
144 | } sctp_subtype_t; | |
145 | ||
146 | #define SCTP_SUBTYPE_CONSTRUCTOR(_name, _type, _elt) \ | |
147 | static inline sctp_subtype_t \ | |
148 | SCTP_ST_## _name (_type _arg) \ | |
149 | { sctp_subtype_t _retval; _retval._elt = _arg; return _retval; } | |
150 | ||
151 | SCTP_SUBTYPE_CONSTRUCTOR(CHUNK, sctp_cid_t, chunk) | |
152 | SCTP_SUBTYPE_CONSTRUCTOR(TIMEOUT, sctp_event_timeout_t, timeout) | |
153 | SCTP_SUBTYPE_CONSTRUCTOR(OTHER, sctp_event_other_t, other) | |
154 | SCTP_SUBTYPE_CONSTRUCTOR(PRIMITIVE, sctp_event_primitive_t, primitive) | |
155 | ||
156 | ||
157 | #define sctp_chunk_is_control(a) (a->chunk_hdr->type != SCTP_CID_DATA) | |
158 | #define sctp_chunk_is_data(a) (a->chunk_hdr->type == SCTP_CID_DATA) | |
159 | ||
160 | /* Calculate the actual data size in a data chunk */ | |
161 | #define SCTP_DATA_SNDSIZE(c) ((int)((unsigned long)(c->chunk_end)\ | |
162 | - (unsigned long)(c->chunk_hdr)\ | |
163 | - sizeof(sctp_data_chunk_t))) | |
164 | ||
165 | #define SCTP_MAX_ERROR_CAUSE SCTP_ERROR_NONEXIST_IP | |
166 | #define SCTP_NUM_ERROR_CAUSE 10 | |
167 | ||
168 | /* Internal error codes */ | |
169 | typedef enum { | |
170 | ||
171 | SCTP_IERROR_NO_ERROR = 0, | |
172 | SCTP_IERROR_BASE = 1000, | |
173 | SCTP_IERROR_NO_COOKIE, | |
174 | SCTP_IERROR_BAD_SIG, | |
175 | SCTP_IERROR_STALE_COOKIE, | |
176 | SCTP_IERROR_NOMEM, | |
177 | SCTP_IERROR_MALFORMED, | |
178 | SCTP_IERROR_BAD_TAG, | |
179 | SCTP_IERROR_BIG_GAP, | |
180 | SCTP_IERROR_DUP_TSN, | |
181 | SCTP_IERROR_HIGH_TSN, | |
182 | SCTP_IERROR_IGNORE_TSN, | |
183 | SCTP_IERROR_NO_DATA, | |
184 | SCTP_IERROR_BAD_STREAM, | |
185 | SCTP_IERROR_BAD_PORTS, | |
bbd0d598 VY |
186 | SCTP_IERROR_AUTH_BAD_HMAC, |
187 | SCTP_IERROR_AUTH_BAD_KEYID, | |
188 | SCTP_IERROR_PROTO_VIOLATION, | |
7ab90804 VY |
189 | SCTP_IERROR_ERROR, |
190 | SCTP_IERROR_ABORT, | |
1da177e4 LT |
191 | } sctp_ierror_t; |
192 | ||
193 | ||
194 | ||
195 | /* SCTP state defines for internal state machine */ | |
196 | typedef enum { | |
197 | ||
198 | SCTP_STATE_EMPTY = 0, | |
199 | SCTP_STATE_CLOSED = 1, | |
200 | SCTP_STATE_COOKIE_WAIT = 2, | |
201 | SCTP_STATE_COOKIE_ECHOED = 3, | |
202 | SCTP_STATE_ESTABLISHED = 4, | |
203 | SCTP_STATE_SHUTDOWN_PENDING = 5, | |
204 | SCTP_STATE_SHUTDOWN_SENT = 6, | |
205 | SCTP_STATE_SHUTDOWN_RECEIVED = 7, | |
206 | SCTP_STATE_SHUTDOWN_ACK_SENT = 8, | |
207 | ||
208 | } sctp_state_t; | |
209 | ||
210 | #define SCTP_STATE_MAX SCTP_STATE_SHUTDOWN_ACK_SENT | |
211 | #define SCTP_STATE_NUM_STATES (SCTP_STATE_MAX + 1) | |
212 | ||
213 | /* These are values for sk->state. | |
214 | * For a UDP-style SCTP socket, the states are defined as follows | |
215 | * - A socket in SCTP_SS_CLOSED state indicates that it is not willing to | |
216 | * accept new associations, but it can initiate the creation of new ones. | |
217 | * - A socket in SCTP_SS_LISTENING state indicates that it is willing to | |
218 | * accept new associations and can initiate the creation of new ones. | |
219 | * - A socket in SCTP_SS_ESTABLISHED state indicates that it is a peeled off | |
220 | * socket with one association. | |
221 | * For a TCP-style SCTP socket, the states are defined as follows | |
222 | * - A socket in SCTP_SS_CLOSED state indicates that it is not willing to | |
223 | * accept new associations, but it can initiate the creation of new ones. | |
224 | * - A socket in SCTP_SS_LISTENING state indicates that it is willing to | |
225 | * accept new associations, but cannot initiate the creation of new ones. | |
226 | * - A socket in SCTP_SS_ESTABLISHED state indicates that it has a single | |
227 | * association. | |
228 | */ | |
229 | typedef enum { | |
230 | SCTP_SS_CLOSED = TCP_CLOSE, | |
231 | SCTP_SS_LISTENING = TCP_LISTEN, | |
232 | SCTP_SS_ESTABLISHING = TCP_SYN_SENT, | |
233 | SCTP_SS_ESTABLISHED = TCP_ESTABLISHED, | |
bec9640b | 234 | SCTP_SS_CLOSING = TCP_CLOSING, |
1da177e4 LT |
235 | } sctp_sock_state_t; |
236 | ||
237 | /* These functions map various type to printable names. */ | |
238 | const char *sctp_cname(const sctp_subtype_t); /* chunk types */ | |
239 | const char *sctp_oname(const sctp_subtype_t); /* other events */ | |
240 | const char *sctp_tname(const sctp_subtype_t); /* timeouts */ | |
241 | const char *sctp_pname(const sctp_subtype_t); /* primitives */ | |
242 | ||
243 | /* This is a table of printable names of sctp_state_t's. */ | |
36cbd3dc JE |
244 | extern const char *const sctp_state_tbl[]; |
245 | extern const char *const sctp_evttype_tbl[]; | |
246 | extern const char *const sctp_status_tbl[]; | |
1da177e4 LT |
247 | |
248 | /* Maximum chunk length considering padding requirements. */ | |
249 | enum { SCTP_MAX_CHUNK_LEN = ((1<<16) - sizeof(__u32)) }; | |
250 | ||
251 | /* Encourage Cookie-Echo bundling by pre-fragmenting chunks a little | |
252 | * harder (until reaching ESTABLISHED state). | |
253 | */ | |
254 | enum { SCTP_ARBITRARY_COOKIE_ECHO_LEN = 200 }; | |
255 | ||
256 | /* Guess at how big to make the TSN mapping array. | |
257 | * We guarantee that we can handle at least this big a gap between the | |
258 | * cumulative ACK and the highest TSN. In practice, we can often | |
259 | * handle up to twice this value. | |
260 | * | |
261 | * NEVER make this more than 32767 (2^15-1). The Gap Ack Blocks in a | |
262 | * SACK (see section 3.3.4) are only 16 bits, so 2*SCTP_TSN_MAP_SIZE | |
263 | * must be less than 65535 (2^16 - 1), or we will have overflow | |
264 | * problems creating SACK's. | |
265 | */ | |
8e1ee18c VY |
266 | #define SCTP_TSN_MAP_INITIAL BITS_PER_LONG |
267 | #define SCTP_TSN_MAP_INCREMENT SCTP_TSN_MAP_INITIAL | |
268 | #define SCTP_TSN_MAP_SIZE 4096 | |
1da177e4 LT |
269 | #define SCTP_TSN_MAX_GAP 65535 |
270 | ||
271 | /* We will not record more than this many duplicate TSNs between two | |
272 | * SACKs. The minimum PMTU is 576. Remove all the headers and there | |
273 | * is enough room for 131 duplicate reports. Round down to the | |
274 | * nearest power of 2. | |
275 | */ | |
276 | enum { SCTP_MIN_PMTU = 576 }; | |
277 | enum { SCTP_MAX_DUP_TSNS = 16 }; | |
278 | enum { SCTP_MAX_GABS = 16 }; | |
279 | ||
2f85a429 | 280 | /* Heartbeat interval - 30 secs */ |
3fd091e7 | 281 | #define SCTP_DEFAULT_TIMEOUT_HEARTBEAT (30*1000) |
1da177e4 | 282 | |
2f85a429 | 283 | /* Delayed sack timer - 200ms */ |
3fd091e7 | 284 | #define SCTP_DEFAULT_TIMEOUT_SACK (200) |
1da177e4 LT |
285 | |
286 | /* RTO.Initial - 3 seconds | |
287 | * RTO.Min - 1 second | |
288 | * RTO.Max - 60 seconds | |
289 | * RTO.Alpha - 1/8 | |
290 | * RTO.Beta - 1/4 | |
291 | */ | |
3fd091e7 VY |
292 | #define SCTP_RTO_INITIAL (3 * 1000) |
293 | #define SCTP_RTO_MIN (1 * 1000) | |
294 | #define SCTP_RTO_MAX (60 * 1000) | |
1da177e4 LT |
295 | |
296 | #define SCTP_RTO_ALPHA 3 /* 1/8 when converted to right shifts. */ | |
297 | #define SCTP_RTO_BETA 2 /* 1/4 when converted to right shifts. */ | |
298 | ||
299 | /* Maximum number of new data packets that can be sent in a burst. */ | |
70331571 | 300 | #define SCTP_DEFAULT_MAX_BURST 4 |
1da177e4 LT |
301 | |
302 | #define SCTP_CLOCK_GRANULARITY 1 /* 1 jiffy */ | |
303 | ||
304 | #define SCTP_DEF_MAX_INIT 6 | |
305 | #define SCTP_DEF_MAX_SEND 10 | |
306 | ||
3fd091e7 | 307 | #define SCTP_DEFAULT_COOKIE_LIFE (60 * 1000) /* 60 seconds */ |
1da177e4 LT |
308 | |
309 | #define SCTP_DEFAULT_MINWINDOW 1500 /* default minimum rwnd size */ | |
310 | #define SCTP_DEFAULT_MAXWINDOW 65535 /* default rwnd size */ | |
311 | #define SCTP_DEFAULT_MAXSEGMENT 1500 /* MTU size, this is the limit | |
312 | * to which we will raise the P-MTU. | |
313 | */ | |
314 | #define SCTP_DEFAULT_MINSEGMENT 512 /* MTU size ... if no mtu disc */ | |
315 | #define SCTP_HOW_MANY_SECRETS 2 /* How many secrets I keep */ | |
316 | #define SCTP_HOW_LONG_COOKIE_LIVE 3600 /* How many seconds the current | |
317 | * secret will live? | |
318 | */ | |
319 | #define SCTP_SECRET_SIZE 32 /* Number of octets in a 256 bits. */ | |
320 | ||
321 | #define SCTP_SIGNATURE_SIZE 20 /* size of a SLA-1 signature */ | |
322 | ||
323 | #define SCTP_COOKIE_MULTIPLE 32 /* Pad out our cookie to make our hash | |
324 | * functions simpler to write. | |
325 | */ | |
326 | ||
327 | #if defined (CONFIG_SCTP_HMAC_MD5) | |
1b489e11 | 328 | #define SCTP_COOKIE_HMAC_ALG "hmac(md5)" |
1da177e4 | 329 | #elif defined (CONFIG_SCTP_HMAC_SHA1) |
1b489e11 | 330 | #define SCTP_COOKIE_HMAC_ALG "hmac(sha1)" |
1da177e4 LT |
331 | #else |
332 | #define SCTP_COOKIE_HMAC_ALG NULL | |
333 | #endif | |
334 | ||
335 | /* These return values describe the success or failure of a number of | |
336 | * routines which form the lower interface to SCTP_outqueue. | |
337 | */ | |
338 | typedef enum { | |
339 | SCTP_XMIT_OK, | |
340 | SCTP_XMIT_PMTU_FULL, | |
341 | SCTP_XMIT_RWND_FULL, | |
342 | SCTP_XMIT_NAGLE_DELAY, | |
343 | } sctp_xmit_t; | |
344 | ||
345 | /* These are the commands for manipulating transports. */ | |
346 | typedef enum { | |
347 | SCTP_TRANSPORT_UP, | |
348 | SCTP_TRANSPORT_DOWN, | |
349 | } sctp_transport_cmd_t; | |
350 | ||
351 | /* These are the address scopes defined mainly for IPv4 addresses | |
352 | * based on draft of SCTP IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. | |
353 | * These scopes are hopefully generic enough to be used on scoping both | |
354 | * IPv4 and IPv6 addresses in SCTP. | |
355 | * At this point, the IPv6 scopes will be mapped to these internal scopes | |
356 | * as much as possible. | |
357 | */ | |
358 | typedef enum { | |
359 | SCTP_SCOPE_GLOBAL, /* IPv4 global addresses */ | |
360 | SCTP_SCOPE_PRIVATE, /* IPv4 private addresses */ | |
361 | SCTP_SCOPE_LINK, /* IPv4 link local address */ | |
362 | SCTP_SCOPE_LOOPBACK, /* IPv4 loopback address */ | |
363 | SCTP_SCOPE_UNUSABLE, /* IPv4 unusable addresses */ | |
364 | } sctp_scope_t; | |
365 | ||
72388433 BD |
366 | typedef enum { |
367 | SCTP_SCOPE_POLICY_DISABLE, /* Disable IPv4 address scoping */ | |
368 | SCTP_SCOPE_POLICY_ENABLE, /* Enable IPv4 address scoping */ | |
369 | SCTP_SCOPE_POLICY_PRIVATE, /* Follow draft but allow IPv4 private addresses */ | |
370 | SCTP_SCOPE_POLICY_LINK, /* Follow draft but allow IPv4 link local addresses */ | |
371 | } sctp_scope_policy_t; | |
372 | ||
1da177e4 LT |
373 | /* Based on IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>, |
374 | * SCTP IPv4 unusable addresses: 0.0.0.0/8, 224.0.0.0/4, 198.18.0.0/24, | |
375 | * 192.88.99.0/24. | |
376 | * Also, RFC 8.4, non-unicast addresses are not considered valid SCTP | |
377 | * addresses. | |
378 | */ | |
b5cb2bbc JP |
379 | #define IS_IPV4_UNUSABLE_ADDRESS(a) \ |
380 | ((htonl(INADDR_BROADCAST) == a) || \ | |
381 | ipv4_is_multicast(a) || \ | |
382 | ipv4_is_zeronet(a) || \ | |
383 | ipv4_is_test_198(a) || \ | |
384 | ipv4_is_anycast_6to4(a)) | |
1da177e4 LT |
385 | |
386 | /* Flags used for the bind address copy functions. */ | |
387 | #define SCTP_ADDR6_ALLOWED 0x00000001 /* IPv6 address is allowed by | |
388 | local sock family */ | |
389 | #define SCTP_ADDR4_PEERSUPP 0x00000002 /* IPv4 address is supported by | |
390 | peer */ | |
391 | #define SCTP_ADDR6_PEERSUPP 0x00000004 /* IPv6 address is supported by | |
392 | peer */ | |
393 | ||
394 | /* Reasons to retransmit. */ | |
395 | typedef enum { | |
396 | SCTP_RTXR_T3_RTX, | |
397 | SCTP_RTXR_FAST_RTX, | |
398 | SCTP_RTXR_PMTUD, | |
b6157d8e | 399 | SCTP_RTXR_T1_RTX, |
1da177e4 LT |
400 | } sctp_retransmit_reason_t; |
401 | ||
402 | /* Reasons to lower cwnd. */ | |
403 | typedef enum { | |
404 | SCTP_LOWER_CWND_T3_RTX, | |
405 | SCTP_LOWER_CWND_FAST_RTX, | |
406 | SCTP_LOWER_CWND_ECNE, | |
407 | SCTP_LOWER_CWND_INACTIVE, | |
408 | } sctp_lower_cwnd_t; | |
409 | ||
1f485649 VY |
410 | |
411 | /* SCTP-AUTH Necessary constants */ | |
412 | ||
413 | /* SCTP-AUTH, Section 3.3 | |
414 | * | |
415 | * The following Table 2 shows the currently defined values for HMAC | |
416 | * identifiers. | |
417 | * | |
418 | * +-----------------+--------------------------+ | |
419 | * | HMAC Identifier | Message Digest Algorithm | | |
420 | * +-----------------+--------------------------+ | |
421 | * | 0 | Reserved | | |
422 | * | 1 | SHA-1 defined in [8] | | |
423 | * | 2 | Reserved | | |
424 | * | 3 | SHA-256 defined in [8] | | |
425 | * +-----------------+--------------------------+ | |
426 | */ | |
427 | enum { | |
428 | SCTP_AUTH_HMAC_ID_RESERVED_0, | |
429 | SCTP_AUTH_HMAC_ID_SHA1, | |
430 | SCTP_AUTH_HMAC_ID_RESERVED_2, | |
b7e0fe9f VY |
431 | #if defined (CONFIG_CRYPTO_SHA256) || defined (CONFIG_CRYPTO_SHA256_MODULE) |
432 | SCTP_AUTH_HMAC_ID_SHA256, | |
433 | #endif | |
434 | __SCTP_AUTH_HMAC_MAX | |
1f485649 VY |
435 | }; |
436 | ||
b7e0fe9f VY |
437 | #define SCTP_AUTH_HMAC_ID_MAX __SCTP_AUTH_HMAC_MAX - 1 |
438 | #define SCTP_AUTH_NUM_HMACS __SCTP_AUTH_HMAC_MAX | |
1f485649 VY |
439 | #define SCTP_SHA1_SIG_SIZE 20 |
440 | #define SCTP_SHA256_SIG_SIZE 32 | |
441 | ||
442 | /* SCTP-AUTH, Section 3.2 | |
443 | * The chunk types for INIT, INIT-ACK, SHUTDOWN-COMPLETE and AUTH chunks | |
444 | * MUST NOT be listed in the CHUNKS parameter | |
445 | */ | |
446 | #define SCTP_NUM_NOAUTH_CHUNKS 4 | |
447 | #define SCTP_AUTH_MAX_CHUNKS (SCTP_NUM_CHUNK_TYPES - SCTP_NUM_NOAUTH_CHUNKS) | |
448 | ||
449 | /* SCTP-AUTH Section 6.1 | |
450 | * The RANDOM parameter MUST contain a 32 byte random number. | |
451 | */ | |
452 | #define SCTP_AUTH_RANDOM_LENGTH 32 | |
453 | ||
1da177e4 | 454 | #endif /* __sctp_constants_h__ */ |