1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001 Intel Corp.
7 * This file is part of the SCTP kernel implementation
9 * This SCTP implementation is free software;
10 * you can redistribute it and/or modify it under the terms of
11 * the GNU General Public License as published by
12 * the Free Software Foundation; either version 2, or (at your option)
15 * This SCTP implementation is distributed in the hope that it
16 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
17 * ************************
18 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
19 * See the GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with GNU CC; see the file COPYING. If not, see
23 * <http://www.gnu.org/licenses/>.
25 * Please send any bug reports or fixes you make to the
27 * lksctp developers <linux-sctp@vger.kernel.org>
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>
40 #ifndef __sctp_constants_h__
41 #define __sctp_constants_h__
43 #include <linux/sctp.h>
44 #include <linux/ipv6.h> /* For ipv6hdr. */
45 #include <net/tcp_states.h> /* For TCP states used in enum sctp_sock_state */
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
};
52 /* Since CIDs are sparse, we need all four of the following
53 * symbols. CIDs are dense through SCTP_CID_BASE_MAX.
55 #define SCTP_CID_BASE_MAX SCTP_CID_SHUTDOWN_COMPLETE
57 #define SCTP_NUM_BASE_CHUNK_TYPES (SCTP_CID_BASE_MAX + 1)
59 #define SCTP_NUM_ADDIP_CHUNK_TYPES 2
61 #define SCTP_NUM_PRSCTP_CHUNK_TYPES 1
63 #define SCTP_NUM_RECONF_CHUNK_TYPES 1
65 #define SCTP_NUM_AUTH_CHUNK_TYPES 1
67 #define SCTP_NUM_CHUNK_TYPES (SCTP_NUM_BASE_CHUNK_TYPES + \
68 SCTP_NUM_ADDIP_CHUNK_TYPES +\
69 SCTP_NUM_PRSCTP_CHUNK_TYPES +\
70 SCTP_NUM_RECONF_CHUNK_TYPES +\
71 SCTP_NUM_AUTH_CHUNK_TYPES)
73 /* These are the different flavours of event. */
75 SCTP_EVENT_T_CHUNK
= 1,
78 SCTP_EVENT_T_PRIMITIVE
81 /* As a convenience for the state machine, we append SCTP_EVENT_* and
82 * SCTP_ULP_* to the list of possible chunks.
85 enum sctp_event_timeout
{
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
,
94 SCTP_EVENT_TIMEOUT_RECONF
,
95 SCTP_EVENT_TIMEOUT_SACK
,
96 SCTP_EVENT_TIMEOUT_AUTOCLOSE
,
99 #define SCTP_EVENT_TIMEOUT_MAX SCTP_EVENT_TIMEOUT_AUTOCLOSE
100 #define SCTP_NUM_TIMEOUT_TYPES (SCTP_EVENT_TIMEOUT_MAX + 1)
102 enum sctp_event_other
{
103 SCTP_EVENT_NO_PENDING_TSN
= 0,
104 SCTP_EVENT_ICMP_PROTO_UNREACH
,
107 #define SCTP_EVENT_OTHER_MAX SCTP_EVENT_ICMP_PROTO_UNREACH
108 #define SCTP_NUM_OTHER_TYPES (SCTP_EVENT_OTHER_MAX + 1)
110 /* These are primitive requests from the ULP. */
111 enum sctp_event_primitive
{
112 SCTP_PRIMITIVE_ASSOCIATE
= 0,
113 SCTP_PRIMITIVE_SHUTDOWN
,
114 SCTP_PRIMITIVE_ABORT
,
116 SCTP_PRIMITIVE_REQUESTHEARTBEAT
,
117 SCTP_PRIMITIVE_ASCONF
,
118 SCTP_PRIMITIVE_RECONF
,
121 #define SCTP_EVENT_PRIMITIVE_MAX SCTP_PRIMITIVE_RECONF
122 #define SCTP_NUM_PRIMITIVE_TYPES (SCTP_EVENT_PRIMITIVE_MAX + 1)
124 /* We define here a utility type for manipulating subtypes.
125 * The subtype constructors all work like this:
127 * union sctp_subtype foo = SCTP_ST_CHUNK(SCTP_CID_INIT);
132 enum sctp_event_timeout timeout
;
133 enum sctp_event_other other
;
134 enum sctp_event_primitive primitive
;
137 #define SCTP_SUBTYPE_CONSTRUCTOR(_name, _type, _elt) \
138 static inline union sctp_subtype \
139 SCTP_ST_## _name (_type _arg) \
140 { union sctp_subtype _retval; _retval._elt = _arg; return _retval; }
142 SCTP_SUBTYPE_CONSTRUCTOR(CHUNK
, enum sctp_cid
, chunk
)
143 SCTP_SUBTYPE_CONSTRUCTOR(TIMEOUT
, enum sctp_event_timeout
, timeout
)
144 SCTP_SUBTYPE_CONSTRUCTOR(OTHER
, enum sctp_event_other
, other
)
145 SCTP_SUBTYPE_CONSTRUCTOR(PRIMITIVE
, enum sctp_event_primitive
, primitive
)
148 #define sctp_chunk_is_data(a) (a->chunk_hdr->type == SCTP_CID_DATA || \
149 a->chunk_hdr->type == SCTP_CID_I_DATA)
151 /* Internal error codes */
153 SCTP_IERROR_NO_ERROR
= 0,
154 SCTP_IERROR_BASE
= 1000,
155 SCTP_IERROR_NO_COOKIE
,
157 SCTP_IERROR_STALE_COOKIE
,
159 SCTP_IERROR_MALFORMED
,
163 SCTP_IERROR_HIGH_TSN
,
164 SCTP_IERROR_IGNORE_TSN
,
166 SCTP_IERROR_BAD_STREAM
,
167 SCTP_IERROR_BAD_PORTS
,
168 SCTP_IERROR_AUTH_BAD_HMAC
,
169 SCTP_IERROR_AUTH_BAD_KEYID
,
170 SCTP_IERROR_PROTO_VIOLATION
,
177 /* SCTP state defines for internal state machine */
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,
191 #define SCTP_STATE_MAX SCTP_STATE_SHUTDOWN_ACK_SENT
192 #define SCTP_STATE_NUM_STATES (SCTP_STATE_MAX + 1)
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
210 enum sctp_sock_state
{
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
,
215 SCTP_SS_CLOSING
= TCP_CLOSE_WAIT
,
218 /* These functions map various type to printable names. */
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 */
224 /* This is a table of printable names of sctp_state_t's. */
225 extern const char *const sctp_state_tbl
[];
226 extern const char *const sctp_evttype_tbl
[];
227 extern const char *const sctp_status_tbl
[];
229 /* Maximum chunk length considering padding requirements. */
230 enum { SCTP_MAX_CHUNK_LEN
= ((1<<16) - sizeof(__u32
)) };
232 /* Encourage Cookie-Echo bundling by pre-fragmenting chunks a little
233 * harder (until reaching ESTABLISHED state).
235 enum { SCTP_ARBITRARY_COOKIE_ECHO_LEN
= 200 };
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.
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.
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
251 /* We will not record more than this many duplicate TSNs between two
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
254 * nearest power of 2.
256 enum { SCTP_MAX_DUP_TSNS
= 16 };
257 enum { SCTP_MAX_GABS
= 16 };
259 /* Heartbeat interval - 30 secs */
260 #define SCTP_DEFAULT_TIMEOUT_HEARTBEAT (30*1000)
262 /* Delayed sack timer - 200ms */
263 #define SCTP_DEFAULT_TIMEOUT_SACK (200)
265 /* RTO.Initial - 3 seconds
267 * RTO.Max - 60 seconds
271 #define SCTP_RTO_INITIAL (3 * 1000)
272 #define SCTP_RTO_MIN (1 * 1000)
273 #define SCTP_RTO_MAX (60 * 1000)
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. */
278 /* Maximum number of new data packets that can be sent in a burst. */
279 #define SCTP_DEFAULT_MAX_BURST 4
281 #define SCTP_CLOCK_GRANULARITY 1 /* 1 jiffy */
283 #define SCTP_DEFAULT_COOKIE_LIFE (60 * 1000) /* 60 seconds */
285 #define SCTP_DEFAULT_MINWINDOW 1500 /* default minimum rwnd size */
286 #define SCTP_DEFAULT_MAXWINDOW 65535 /* default rwnd size */
287 #define SCTP_DEFAULT_RWND_SHIFT 4 /* by default, update on 1/16 of
288 * rcvbuf, which is 1/8 of initial
291 #define SCTP_DEFAULT_MAXSEGMENT 1500 /* MTU size, this is the limit
292 * to which we will raise the P-MTU.
294 #define SCTP_DEFAULT_MINSEGMENT 512 /* MTU size ... if no mtu disc */
296 #define SCTP_SECRET_SIZE 32 /* Number of octets in a 256 bits. */
298 #define SCTP_SIGNATURE_SIZE 20 /* size of a SLA-1 signature */
300 #define SCTP_COOKIE_MULTIPLE 32 /* Pad out our cookie to make our hash
301 * functions simpler to write.
304 /* These return values describe the success or failure of a number of
305 * routines which form the lower interface to SCTP_outqueue.
314 /* These are the commands for manipulating transports. */
315 enum sctp_transport_cmd
{
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.
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 */
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 */
343 #define SCTP_SCOPE_POLICY_MAX SCTP_SCOPE_POLICY_LINK
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,
348 * Also, RFC 8.4, non-unicast addresses are not considered valid SCTP
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))
358 /* Flags used for the bind address copy functions. */
359 #define SCTP_ADDR6_ALLOWED 0x00000001 /* IPv6 address is allowed by
361 #define SCTP_ADDR4_PEERSUPP 0x00000002 /* IPv4 address is supported by
363 #define SCTP_ADDR6_PEERSUPP 0x00000004 /* IPv6 address is supported by
366 /* Reasons to retransmit. */
367 enum sctp_retransmit_reason
{
374 /* Reasons to lower cwnd. */
375 enum sctp_lower_cwnd
{
376 SCTP_LOWER_CWND_T3_RTX
,
377 SCTP_LOWER_CWND_FAST_RTX
,
378 SCTP_LOWER_CWND_ECNE
,
379 SCTP_LOWER_CWND_INACTIVE
,
383 /* SCTP-AUTH Necessary constants */
385 /* SCTP-AUTH, Section 3.3
387 * The following Table 2 shows the currently defined values for HMAC
390 * +-----------------+--------------------------+
391 * | HMAC Identifier | Message Digest Algorithm |
392 * +-----------------+--------------------------+
394 * | 1 | SHA-1 defined in [8] |
396 * | 3 | SHA-256 defined in [8] |
397 * +-----------------+--------------------------+
400 SCTP_AUTH_HMAC_ID_RESERVED_0
,
401 SCTP_AUTH_HMAC_ID_SHA1
,
402 SCTP_AUTH_HMAC_ID_RESERVED_2
,
403 #if defined (CONFIG_CRYPTO_SHA256) || defined (CONFIG_CRYPTO_SHA256_MODULE)
404 SCTP_AUTH_HMAC_ID_SHA256
,
409 #define SCTP_AUTH_HMAC_ID_MAX __SCTP_AUTH_HMAC_MAX - 1
410 #define SCTP_AUTH_NUM_HMACS __SCTP_AUTH_HMAC_MAX
411 #define SCTP_SHA1_SIG_SIZE 20
412 #define SCTP_SHA256_SIG_SIZE 32
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
418 #define SCTP_NUM_NOAUTH_CHUNKS 4
419 #define SCTP_AUTH_MAX_CHUNKS (SCTP_NUM_CHUNK_TYPES - SCTP_NUM_NOAUTH_CHUNKS)
421 /* SCTP-AUTH Section 6.1
422 * The RANDOM parameter MUST contain a 32 byte random number.
424 #define SCTP_AUTH_RANDOM_LENGTH 32
426 #endif /* __sctp_constants_h__ */