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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 | |
a6227e26 JK |
22 | * along with GNU CC; see the file COPYING. If not, see |
23 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
24 | * |
25 | * Please send any bug reports or fixes you make to the | |
26 | * email address(es): | |
91705c61 | 27 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 28 | * |
1da177e4 LT |
29 | * Written or modified by: |
30 | * La Monte H.P. Yarroll <piggy@acm.org> | |
31 | * Karl Knutson <karl@athena.chicago.il.us> | |
32 | * Randall Stewart <randall@stewart.chicago.il.us> | |
33 | * Ken Morneau <kmorneau@cisco.com> | |
34 | * Qiaobing Xie <qxie1@motorola.com> | |
35 | * Xingang Guo <xingang.guo@intel.com> | |
36 | * Sridhar Samudrala <samudrala@us.ibm.com> | |
37 | * Daisy Chang <daisyc@us.ibm.com> | |
1da177e4 LT |
38 | */ |
39 | ||
40 | #ifndef __sctp_constants_h__ | |
41 | #define __sctp_constants_h__ | |
42 | ||
1da177e4 LT |
43 | #include <linux/sctp.h> |
44 | #include <linux/ipv6.h> /* For ipv6hdr. */ | |
84965614 | 45 | #include <net/tcp_states.h> /* For TCP states used in enum sctp_sock_state */ |
1da177e4 LT |
46 | |
47 | /* Value used for stream negotiation. */ | |
48 | enum { SCTP_MAX_STREAM = 0xffff }; | |
49 | enum { SCTP_DEFAULT_OUTSTREAMS = 10 }; | |
50 | enum { SCTP_DEFAULT_INSTREAMS = SCTP_MAX_STREAM }; | |
51 | ||
52 | /* Since CIDs are sparse, we need all four of the following | |
53 | * symbols. CIDs are dense through SCTP_CID_BASE_MAX. | |
54 | */ | |
55 | #define SCTP_CID_BASE_MAX SCTP_CID_SHUTDOWN_COMPLETE | |
1da177e4 LT |
56 | |
57 | #define SCTP_NUM_BASE_CHUNK_TYPES (SCTP_CID_BASE_MAX + 1) | |
1da177e4 LT |
58 | |
59 | #define SCTP_NUM_ADDIP_CHUNK_TYPES 2 | |
60 | ||
61 | #define SCTP_NUM_PRSCTP_CHUNK_TYPES 1 | |
62 | ||
d884aa63 XL |
63 | #define SCTP_NUM_RECONF_CHUNK_TYPES 1 |
64 | ||
1f485649 VY |
65 | #define SCTP_NUM_AUTH_CHUNK_TYPES 1 |
66 | ||
67 | #define SCTP_NUM_CHUNK_TYPES (SCTP_NUM_BASE_CHUNK_TYPES + \ | |
68 | SCTP_NUM_ADDIP_CHUNK_TYPES +\ | |
69 | SCTP_NUM_PRSCTP_CHUNK_TYPES +\ | |
d884aa63 | 70 | SCTP_NUM_RECONF_CHUNK_TYPES +\ |
1f485649 VY |
71 | SCTP_NUM_AUTH_CHUNK_TYPES) |
72 | ||
1da177e4 | 73 | /* These are the different flavours of event. */ |
88ee48c1 | 74 | enum sctp_event_type { |
1da177e4 LT |
75 | SCTP_EVENT_T_CHUNK = 1, |
76 | SCTP_EVENT_T_TIMEOUT, | |
77 | SCTP_EVENT_T_OTHER, | |
78 | SCTP_EVENT_T_PRIMITIVE | |
61f0eb07 | 79 | }; |
1da177e4 | 80 | |
1da177e4 LT |
81 | /* As a convenience for the state machine, we append SCTP_EVENT_* and |
82 | * SCTP_ULP_* to the list of possible chunks. | |
83 | */ | |
84 | ||
19cd1592 | 85 | enum sctp_event_timeout { |
1da177e4 LT |
86 | SCTP_EVENT_TIMEOUT_NONE = 0, |
87 | SCTP_EVENT_TIMEOUT_T1_COOKIE, | |
88 | SCTP_EVENT_TIMEOUT_T1_INIT, | |
89 | SCTP_EVENT_TIMEOUT_T2_SHUTDOWN, | |
90 | SCTP_EVENT_TIMEOUT_T3_RTX, | |
91 | SCTP_EVENT_TIMEOUT_T4_RTO, | |
92 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD, | |
93 | SCTP_EVENT_TIMEOUT_HEARTBEAT, | |
7b9438de | 94 | SCTP_EVENT_TIMEOUT_RECONF, |
1da177e4 LT |
95 | SCTP_EVENT_TIMEOUT_SACK, |
96 | SCTP_EVENT_TIMEOUT_AUTOCLOSE, | |
19cd1592 | 97 | }; |
1da177e4 LT |
98 | |
99 | #define SCTP_EVENT_TIMEOUT_MAX SCTP_EVENT_TIMEOUT_AUTOCLOSE | |
100 | #define SCTP_NUM_TIMEOUT_TYPES (SCTP_EVENT_TIMEOUT_MAX + 1) | |
101 | ||
a0f098d0 | 102 | enum sctp_event_other { |
1da177e4 LT |
103 | SCTP_EVENT_NO_PENDING_TSN = 0, |
104 | SCTP_EVENT_ICMP_PROTO_UNREACH, | |
a0f098d0 | 105 | }; |
1da177e4 LT |
106 | |
107 | #define SCTP_EVENT_OTHER_MAX SCTP_EVENT_ICMP_PROTO_UNREACH | |
108 | #define SCTP_NUM_OTHER_TYPES (SCTP_EVENT_OTHER_MAX + 1) | |
109 | ||
110 | /* These are primitive requests from the ULP. */ | |
dc1e0e6e | 111 | enum sctp_event_primitive { |
1da177e4 LT |
112 | SCTP_PRIMITIVE_ASSOCIATE = 0, |
113 | SCTP_PRIMITIVE_SHUTDOWN, | |
114 | SCTP_PRIMITIVE_ABORT, | |
115 | SCTP_PRIMITIVE_SEND, | |
116 | SCTP_PRIMITIVE_REQUESTHEARTBEAT, | |
117 | SCTP_PRIMITIVE_ASCONF, | |
7a090b04 | 118 | SCTP_PRIMITIVE_RECONF, |
dc1e0e6e | 119 | }; |
1da177e4 | 120 | |
7a090b04 | 121 | #define SCTP_EVENT_PRIMITIVE_MAX SCTP_PRIMITIVE_RECONF |
1da177e4 LT |
122 | #define SCTP_NUM_PRIMITIVE_TYPES (SCTP_EVENT_PRIMITIVE_MAX + 1) |
123 | ||
124 | /* We define here a utility type for manipulating subtypes. | |
125 | * The subtype constructors all work like this: | |
126 | * | |
bfc6f827 | 127 | * union sctp_subtype foo = SCTP_ST_CHUNK(SCTP_CID_INIT); |
1da177e4 LT |
128 | */ |
129 | ||
bfc6f827 | 130 | union sctp_subtype { |
6d85e68f | 131 | enum sctp_cid chunk; |
19cd1592 | 132 | enum sctp_event_timeout timeout; |
a0f098d0 | 133 | enum sctp_event_other other; |
dc1e0e6e | 134 | enum sctp_event_primitive primitive; |
bfc6f827 | 135 | }; |
1da177e4 LT |
136 | |
137 | #define SCTP_SUBTYPE_CONSTRUCTOR(_name, _type, _elt) \ | |
bfc6f827 | 138 | static inline union sctp_subtype \ |
1da177e4 | 139 | SCTP_ST_## _name (_type _arg) \ |
bfc6f827 | 140 | { union sctp_subtype _retval; _retval._elt = _arg; return _retval; } |
1da177e4 | 141 | |
6d85e68f | 142 | SCTP_SUBTYPE_CONSTRUCTOR(CHUNK, enum sctp_cid, chunk) |
19cd1592 | 143 | SCTP_SUBTYPE_CONSTRUCTOR(TIMEOUT, enum sctp_event_timeout, timeout) |
a0f098d0 | 144 | SCTP_SUBTYPE_CONSTRUCTOR(OTHER, enum sctp_event_other, other) |
dc1e0e6e | 145 | SCTP_SUBTYPE_CONSTRUCTOR(PRIMITIVE, enum sctp_event_primitive, primitive) |
1da177e4 LT |
146 | |
147 | ||
668c9beb XL |
148 | #define sctp_chunk_is_data(a) (a->chunk_hdr->type == SCTP_CID_DATA || \ |
149 | a->chunk_hdr->type == SCTP_CID_I_DATA) | |
1da177e4 | 150 | |
1da177e4 | 151 | /* Internal error codes */ |
4785c7ae | 152 | enum sctp_ierror { |
1da177e4 LT |
153 | SCTP_IERROR_NO_ERROR = 0, |
154 | SCTP_IERROR_BASE = 1000, | |
155 | SCTP_IERROR_NO_COOKIE, | |
156 | SCTP_IERROR_BAD_SIG, | |
157 | SCTP_IERROR_STALE_COOKIE, | |
158 | SCTP_IERROR_NOMEM, | |
159 | SCTP_IERROR_MALFORMED, | |
160 | SCTP_IERROR_BAD_TAG, | |
161 | SCTP_IERROR_BIG_GAP, | |
162 | SCTP_IERROR_DUP_TSN, | |
163 | SCTP_IERROR_HIGH_TSN, | |
164 | SCTP_IERROR_IGNORE_TSN, | |
165 | SCTP_IERROR_NO_DATA, | |
166 | SCTP_IERROR_BAD_STREAM, | |
167 | SCTP_IERROR_BAD_PORTS, | |
bbd0d598 VY |
168 | SCTP_IERROR_AUTH_BAD_HMAC, |
169 | SCTP_IERROR_AUTH_BAD_KEYID, | |
170 | SCTP_IERROR_PROTO_VIOLATION, | |
7ab90804 VY |
171 | SCTP_IERROR_ERROR, |
172 | SCTP_IERROR_ABORT, | |
4785c7ae | 173 | }; |
1da177e4 LT |
174 | |
175 | ||
176 | ||
177 | /* SCTP state defines for internal state machine */ | |
52106019 | 178 | enum sctp_state { |
1da177e4 | 179 | |
0b8f9e25 VY |
180 | SCTP_STATE_CLOSED = 0, |
181 | SCTP_STATE_COOKIE_WAIT = 1, | |
182 | SCTP_STATE_COOKIE_ECHOED = 2, | |
183 | SCTP_STATE_ESTABLISHED = 3, | |
184 | SCTP_STATE_SHUTDOWN_PENDING = 4, | |
185 | SCTP_STATE_SHUTDOWN_SENT = 5, | |
186 | SCTP_STATE_SHUTDOWN_RECEIVED = 6, | |
187 | SCTP_STATE_SHUTDOWN_ACK_SENT = 7, | |
1da177e4 | 188 | |
52106019 | 189 | }; |
1da177e4 LT |
190 | |
191 | #define SCTP_STATE_MAX SCTP_STATE_SHUTDOWN_ACK_SENT | |
192 | #define SCTP_STATE_NUM_STATES (SCTP_STATE_MAX + 1) | |
193 | ||
194 | /* These are values for sk->state. | |
195 | * For a UDP-style SCTP socket, the states are defined as follows | |
196 | * - A socket in SCTP_SS_CLOSED state indicates that it is not willing to | |
197 | * accept new associations, but it can initiate the creation of new ones. | |
198 | * - A socket in SCTP_SS_LISTENING state indicates that it is willing to | |
199 | * accept new associations and can initiate the creation of new ones. | |
200 | * - A socket in SCTP_SS_ESTABLISHED state indicates that it is a peeled off | |
201 | * socket with one association. | |
202 | * For a TCP-style SCTP socket, the states are defined as follows | |
203 | * - A socket in SCTP_SS_CLOSED state indicates that it is not willing to | |
204 | * accept new associations, but it can initiate the creation of new ones. | |
205 | * - A socket in SCTP_SS_LISTENING state indicates that it is willing to | |
206 | * accept new associations, but cannot initiate the creation of new ones. | |
207 | * - A socket in SCTP_SS_ESTABLISHED state indicates that it has a single | |
208 | * association. | |
209 | */ | |
84965614 | 210 | enum sctp_sock_state { |
1da177e4 LT |
211 | SCTP_SS_CLOSED = TCP_CLOSE, |
212 | SCTP_SS_LISTENING = TCP_LISTEN, | |
213 | SCTP_SS_ESTABLISHING = TCP_SYN_SENT, | |
214 | SCTP_SS_ESTABLISHED = TCP_ESTABLISHED, | |
df7e88f6 | 215 | SCTP_SS_CLOSING = TCP_CLOSE_WAIT, |
84965614 | 216 | }; |
1da177e4 LT |
217 | |
218 | /* These functions map various type to printable names. */ | |
bfc6f827 XL |
219 | const char *sctp_cname(const union sctp_subtype id); /* chunk types */ |
220 | const char *sctp_oname(const union sctp_subtype id); /* other events */ | |
221 | const char *sctp_tname(const union sctp_subtype id); /* timeouts */ | |
222 | const char *sctp_pname(const union sctp_subtype id); /* primitives */ | |
1da177e4 LT |
223 | |
224 | /* This is a table of printable names of sctp_state_t's. */ | |
36cbd3dc JE |
225 | extern const char *const sctp_state_tbl[]; |
226 | extern const char *const sctp_evttype_tbl[]; | |
227 | extern const char *const sctp_status_tbl[]; | |
1da177e4 LT |
228 | |
229 | /* Maximum chunk length considering padding requirements. */ | |
230 | enum { SCTP_MAX_CHUNK_LEN = ((1<<16) - sizeof(__u32)) }; | |
231 | ||
232 | /* Encourage Cookie-Echo bundling by pre-fragmenting chunks a little | |
233 | * harder (until reaching ESTABLISHED state). | |
234 | */ | |
235 | enum { SCTP_ARBITRARY_COOKIE_ECHO_LEN = 200 }; | |
236 | ||
237 | /* Guess at how big to make the TSN mapping array. | |
238 | * We guarantee that we can handle at least this big a gap between the | |
239 | * cumulative ACK and the highest TSN. In practice, we can often | |
240 | * handle up to twice this value. | |
241 | * | |
242 | * NEVER make this more than 32767 (2^15-1). The Gap Ack Blocks in a | |
243 | * SACK (see section 3.3.4) are only 16 bits, so 2*SCTP_TSN_MAP_SIZE | |
244 | * must be less than 65535 (2^16 - 1), or we will have overflow | |
245 | * problems creating SACK's. | |
246 | */ | |
8e1ee18c VY |
247 | #define SCTP_TSN_MAP_INITIAL BITS_PER_LONG |
248 | #define SCTP_TSN_MAP_INCREMENT SCTP_TSN_MAP_INITIAL | |
249 | #define SCTP_TSN_MAP_SIZE 4096 | |
1da177e4 LT |
250 | |
251 | /* We will not record more than this many duplicate TSNs between two | |
c45698f8 MRL |
252 | * SACKs. The minimum PMTU is 512. Remove all the headers and there |
253 | * is enough room for 117 duplicate reports. Round down to the | |
1da177e4 LT |
254 | * nearest power of 2. |
255 | */ | |
1da177e4 LT |
256 | enum { SCTP_MAX_DUP_TSNS = 16 }; |
257 | enum { SCTP_MAX_GABS = 16 }; | |
258 | ||
2f85a429 | 259 | /* Heartbeat interval - 30 secs */ |
3fd091e7 | 260 | #define SCTP_DEFAULT_TIMEOUT_HEARTBEAT (30*1000) |
1da177e4 | 261 | |
2f85a429 | 262 | /* Delayed sack timer - 200ms */ |
3fd091e7 | 263 | #define SCTP_DEFAULT_TIMEOUT_SACK (200) |
1da177e4 LT |
264 | |
265 | /* RTO.Initial - 3 seconds | |
266 | * RTO.Min - 1 second | |
267 | * RTO.Max - 60 seconds | |
268 | * RTO.Alpha - 1/8 | |
269 | * RTO.Beta - 1/4 | |
270 | */ | |
3fd091e7 VY |
271 | #define SCTP_RTO_INITIAL (3 * 1000) |
272 | #define SCTP_RTO_MIN (1 * 1000) | |
273 | #define SCTP_RTO_MAX (60 * 1000) | |
1da177e4 LT |
274 | |
275 | #define SCTP_RTO_ALPHA 3 /* 1/8 when converted to right shifts. */ | |
276 | #define SCTP_RTO_BETA 2 /* 1/4 when converted to right shifts. */ | |
277 | ||
278 | /* Maximum number of new data packets that can be sent in a burst. */ | |
70331571 | 279 | #define SCTP_DEFAULT_MAX_BURST 4 |
1da177e4 LT |
280 | |
281 | #define SCTP_CLOCK_GRANULARITY 1 /* 1 jiffy */ | |
282 | ||
3fd091e7 | 283 | #define SCTP_DEFAULT_COOKIE_LIFE (60 * 1000) /* 60 seconds */ |
1da177e4 LT |
284 | |
285 | #define SCTP_DEFAULT_MINWINDOW 1500 /* default minimum rwnd size */ | |
286 | #define SCTP_DEFAULT_MAXWINDOW 65535 /* default rwnd size */ | |
90f2f531 VY |
287 | #define SCTP_DEFAULT_RWND_SHIFT 4 /* by default, update on 1/16 of |
288 | * rcvbuf, which is 1/8 of initial | |
289 | * window | |
290 | */ | |
1da177e4 LT |
291 | #define SCTP_DEFAULT_MAXSEGMENT 1500 /* MTU size, this is the limit |
292 | * to which we will raise the P-MTU. | |
293 | */ | |
294 | #define SCTP_DEFAULT_MINSEGMENT 512 /* MTU size ... if no mtu disc */ | |
570617e7 | 295 | |
1da177e4 LT |
296 | #define SCTP_SECRET_SIZE 32 /* Number of octets in a 256 bits. */ |
297 | ||
298 | #define SCTP_SIGNATURE_SIZE 20 /* size of a SLA-1 signature */ | |
299 | ||
300 | #define SCTP_COOKIE_MULTIPLE 32 /* Pad out our cookie to make our hash | |
301 | * functions simpler to write. | |
302 | */ | |
303 | ||
1da177e4 LT |
304 | /* These return values describe the success or failure of a number of |
305 | * routines which form the lower interface to SCTP_outqueue. | |
306 | */ | |
86b36f2a | 307 | enum sctp_xmit { |
1da177e4 LT |
308 | SCTP_XMIT_OK, |
309 | SCTP_XMIT_PMTU_FULL, | |
310 | SCTP_XMIT_RWND_FULL, | |
526cbef7 | 311 | SCTP_XMIT_DELAY, |
86b36f2a | 312 | }; |
1da177e4 LT |
313 | |
314 | /* These are the commands for manipulating transports. */ | |
0ceaeebe | 315 | enum sctp_transport_cmd { |
1da177e4 LT |
316 | SCTP_TRANSPORT_UP, |
317 | SCTP_TRANSPORT_DOWN, | |
5aa93bcf | 318 | SCTP_TRANSPORT_PF, |
0ceaeebe | 319 | }; |
1da177e4 LT |
320 | |
321 | /* These are the address scopes defined mainly for IPv4 addresses | |
322 | * based on draft of SCTP IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. | |
323 | * These scopes are hopefully generic enough to be used on scoping both | |
324 | * IPv4 and IPv6 addresses in SCTP. | |
325 | * At this point, the IPv6 scopes will be mapped to these internal scopes | |
326 | * as much as possible. | |
327 | */ | |
1c662018 | 328 | enum sctp_scope { |
1da177e4 LT |
329 | SCTP_SCOPE_GLOBAL, /* IPv4 global addresses */ |
330 | SCTP_SCOPE_PRIVATE, /* IPv4 private addresses */ | |
331 | SCTP_SCOPE_LINK, /* IPv4 link local address */ | |
332 | SCTP_SCOPE_LOOPBACK, /* IPv4 loopback address */ | |
333 | SCTP_SCOPE_UNUSABLE, /* IPv4 unusable addresses */ | |
1c662018 | 334 | }; |
1da177e4 | 335 | |
701ef3e6 | 336 | enum { |
72388433 BD |
337 | SCTP_SCOPE_POLICY_DISABLE, /* Disable IPv4 address scoping */ |
338 | SCTP_SCOPE_POLICY_ENABLE, /* Enable IPv4 address scoping */ | |
339 | SCTP_SCOPE_POLICY_PRIVATE, /* Follow draft but allow IPv4 private addresses */ | |
340 | SCTP_SCOPE_POLICY_LINK, /* Follow draft but allow IPv4 link local addresses */ | |
701ef3e6 XL |
341 | }; |
342 | ||
343 | #define SCTP_SCOPE_POLICY_MAX SCTP_SCOPE_POLICY_LINK | |
72388433 | 344 | |
1da177e4 LT |
345 | /* Based on IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>, |
346 | * SCTP IPv4 unusable addresses: 0.0.0.0/8, 224.0.0.0/4, 198.18.0.0/24, | |
347 | * 192.88.99.0/24. | |
348 | * Also, RFC 8.4, non-unicast addresses are not considered valid SCTP | |
349 | * addresses. | |
350 | */ | |
b5cb2bbc JP |
351 | #define IS_IPV4_UNUSABLE_ADDRESS(a) \ |
352 | ((htonl(INADDR_BROADCAST) == a) || \ | |
353 | ipv4_is_multicast(a) || \ | |
354 | ipv4_is_zeronet(a) || \ | |
355 | ipv4_is_test_198(a) || \ | |
356 | ipv4_is_anycast_6to4(a)) | |
1da177e4 LT |
357 | |
358 | /* Flags used for the bind address copy functions. */ | |
359 | #define SCTP_ADDR6_ALLOWED 0x00000001 /* IPv6 address is allowed by | |
360 | local sock family */ | |
361 | #define SCTP_ADDR4_PEERSUPP 0x00000002 /* IPv4 address is supported by | |
362 | peer */ | |
363 | #define SCTP_ADDR6_PEERSUPP 0x00000004 /* IPv6 address is supported by | |
364 | peer */ | |
365 | ||
366 | /* Reasons to retransmit. */ | |
125c2982 | 367 | enum sctp_retransmit_reason { |
1da177e4 LT |
368 | SCTP_RTXR_T3_RTX, |
369 | SCTP_RTXR_FAST_RTX, | |
370 | SCTP_RTXR_PMTUD, | |
b6157d8e | 371 | SCTP_RTXR_T1_RTX, |
125c2982 | 372 | }; |
1da177e4 LT |
373 | |
374 | /* Reasons to lower cwnd. */ | |
233e7936 | 375 | enum sctp_lower_cwnd { |
1da177e4 LT |
376 | SCTP_LOWER_CWND_T3_RTX, |
377 | SCTP_LOWER_CWND_FAST_RTX, | |
378 | SCTP_LOWER_CWND_ECNE, | |
379 | SCTP_LOWER_CWND_INACTIVE, | |
233e7936 | 380 | }; |
1da177e4 | 381 | |
1f485649 VY |
382 | |
383 | /* SCTP-AUTH Necessary constants */ | |
384 | ||
385 | /* SCTP-AUTH, Section 3.3 | |
386 | * | |
387 | * The following Table 2 shows the currently defined values for HMAC | |
388 | * identifiers. | |
389 | * | |
390 | * +-----------------+--------------------------+ | |
391 | * | HMAC Identifier | Message Digest Algorithm | | |
392 | * +-----------------+--------------------------+ | |
393 | * | 0 | Reserved | | |
394 | * | 1 | SHA-1 defined in [8] | | |
395 | * | 2 | Reserved | | |
396 | * | 3 | SHA-256 defined in [8] | | |
397 | * +-----------------+--------------------------+ | |
398 | */ | |
399 | enum { | |
400 | SCTP_AUTH_HMAC_ID_RESERVED_0, | |
401 | SCTP_AUTH_HMAC_ID_SHA1, | |
402 | SCTP_AUTH_HMAC_ID_RESERVED_2, | |
b7e0fe9f VY |
403 | #if defined (CONFIG_CRYPTO_SHA256) || defined (CONFIG_CRYPTO_SHA256_MODULE) |
404 | SCTP_AUTH_HMAC_ID_SHA256, | |
405 | #endif | |
406 | __SCTP_AUTH_HMAC_MAX | |
1f485649 VY |
407 | }; |
408 | ||
b7e0fe9f VY |
409 | #define SCTP_AUTH_HMAC_ID_MAX __SCTP_AUTH_HMAC_MAX - 1 |
410 | #define SCTP_AUTH_NUM_HMACS __SCTP_AUTH_HMAC_MAX | |
1f485649 VY |
411 | #define SCTP_SHA1_SIG_SIZE 20 |
412 | #define SCTP_SHA256_SIG_SIZE 32 | |
413 | ||
414 | /* SCTP-AUTH, Section 3.2 | |
415 | * The chunk types for INIT, INIT-ACK, SHUTDOWN-COMPLETE and AUTH chunks | |
416 | * MUST NOT be listed in the CHUNKS parameter | |
417 | */ | |
418 | #define SCTP_NUM_NOAUTH_CHUNKS 4 | |
419 | #define SCTP_AUTH_MAX_CHUNKS (SCTP_NUM_CHUNK_TYPES - SCTP_NUM_NOAUTH_CHUNKS) | |
420 | ||
421 | /* SCTP-AUTH Section 6.1 | |
422 | * The RANDOM parameter MUST contain a 32 byte random number. | |
423 | */ | |
424 | #define SCTP_AUTH_RANDOM_LENGTH 32 | |
425 | ||
1da177e4 | 426 | #endif /* __sctp_constants_h__ */ |