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-/* SCTP kernel implementation
- * (C) Copyright IBM Corp. 2001, 2004
- * Copyright (c) 1999-2000 Cisco, Inc.
- * Copyright (c) 1999-2001 Motorola, Inc.
- * Copyright (c) 2001 Intel Corp.
- *
- * This file is part of the SCTP kernel implementation
- *
- * This SCTP implementation is free software;
- * you can redistribute it and/or modify it under the terms of
- * the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This SCTP implementation is distributed in the hope that it
- * will be useful, but WITHOUT ANY WARRANTY; without even the implied
- * ************************
- * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with GNU CC; see the file COPYING. If not, write to
- * the Free Software Foundation, 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- *
- * Please send any bug reports or fixes you make to the
- * email address(es):
- * lksctp developers <lksctp-developers@lists.sourceforge.net>
- *
- * Or submit a bug report through the following website:
- * http://www.sf.net/projects/lksctp
- *
- * Written or modified by:
- * La Monte H.P. Yarroll <piggy@acm.org>
- * Karl Knutson <karl@athena.chicago.il.us>
- * Randall Stewart <randall@stewart.chicago.il.us>
- * Ken Morneau <kmorneau@cisco.com>
- * Qiaobing Xie <qxie1@motorola.com>
- * Xingang Guo <xingang.guo@intel.com>
- * Sridhar Samudrala <samudrala@us.ibm.com>
- * Daisy Chang <daisyc@us.ibm.com>
- *
- * Any bugs reported given to us we will try to fix... any fixes shared will
- * be incorporated into the next SCTP release.
- */
-
-#ifndef __sctp_constants_h__
-#define __sctp_constants_h__
-
-#include <linux/sctp.h>
-#include <linux/ipv6.h> /* For ipv6hdr. */
-#include <net/sctp/user.h>
-#include <net/tcp_states.h> /* For TCP states used in sctp_sock_state_t */
-
-/* Value used for stream negotiation. */
-enum { SCTP_MAX_STREAM = 0xffff };
-enum { SCTP_DEFAULT_OUTSTREAMS = 10 };
-enum { SCTP_DEFAULT_INSTREAMS = SCTP_MAX_STREAM };
-
-/* Since CIDs are sparse, we need all four of the following
- * symbols. CIDs are dense through SCTP_CID_BASE_MAX.
- */
-#define SCTP_CID_BASE_MAX SCTP_CID_SHUTDOWN_COMPLETE
-
-#define SCTP_NUM_BASE_CHUNK_TYPES (SCTP_CID_BASE_MAX + 1)
-
-#define SCTP_NUM_ADDIP_CHUNK_TYPES 2
-
-#define SCTP_NUM_PRSCTP_CHUNK_TYPES 1
-
-#define SCTP_NUM_AUTH_CHUNK_TYPES 1
-
-#define SCTP_NUM_CHUNK_TYPES (SCTP_NUM_BASE_CHUNK_TYPES + \
- SCTP_NUM_ADDIP_CHUNK_TYPES +\
- SCTP_NUM_PRSCTP_CHUNK_TYPES +\
- SCTP_NUM_AUTH_CHUNK_TYPES)
-
-/* These are the different flavours of event. */
-typedef enum {
-
- SCTP_EVENT_T_CHUNK = 1,
- SCTP_EVENT_T_TIMEOUT,
- SCTP_EVENT_T_OTHER,
- SCTP_EVENT_T_PRIMITIVE
-
-} sctp_event_t;
-
-/* As a convenience for the state machine, we append SCTP_EVENT_* and
- * SCTP_ULP_* to the list of possible chunks.
- */
-
-typedef enum {
- SCTP_EVENT_TIMEOUT_NONE = 0,
- SCTP_EVENT_TIMEOUT_T1_COOKIE,
- SCTP_EVENT_TIMEOUT_T1_INIT,
- SCTP_EVENT_TIMEOUT_T2_SHUTDOWN,
- SCTP_EVENT_TIMEOUT_T3_RTX,
- SCTP_EVENT_TIMEOUT_T4_RTO,
- SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD,
- SCTP_EVENT_TIMEOUT_HEARTBEAT,
- SCTP_EVENT_TIMEOUT_SACK,
- SCTP_EVENT_TIMEOUT_AUTOCLOSE,
-} sctp_event_timeout_t;
-
-#define SCTP_EVENT_TIMEOUT_MAX SCTP_EVENT_TIMEOUT_AUTOCLOSE
-#define SCTP_NUM_TIMEOUT_TYPES (SCTP_EVENT_TIMEOUT_MAX + 1)
-
-typedef enum {
- SCTP_EVENT_NO_PENDING_TSN = 0,
- SCTP_EVENT_ICMP_PROTO_UNREACH,
-} sctp_event_other_t;
-
-#define SCTP_EVENT_OTHER_MAX SCTP_EVENT_ICMP_PROTO_UNREACH
-#define SCTP_NUM_OTHER_TYPES (SCTP_EVENT_OTHER_MAX + 1)
-
-/* These are primitive requests from the ULP. */
-typedef enum {
- SCTP_PRIMITIVE_ASSOCIATE = 0,
- SCTP_PRIMITIVE_SHUTDOWN,
- SCTP_PRIMITIVE_ABORT,
- SCTP_PRIMITIVE_SEND,
- SCTP_PRIMITIVE_REQUESTHEARTBEAT,
- SCTP_PRIMITIVE_ASCONF,
-} sctp_event_primitive_t;
-
-#define SCTP_EVENT_PRIMITIVE_MAX SCTP_PRIMITIVE_ASCONF
-#define SCTP_NUM_PRIMITIVE_TYPES (SCTP_EVENT_PRIMITIVE_MAX + 1)
-
-/* We define here a utility type for manipulating subtypes.
- * The subtype constructors all work like this:
- *
- * sctp_subtype_t foo = SCTP_ST_CHUNK(SCTP_CID_INIT);
- */
-
-typedef union {
- sctp_cid_t chunk;
- sctp_event_timeout_t timeout;
- sctp_event_other_t other;
- sctp_event_primitive_t primitive;
-} sctp_subtype_t;
-
-#define SCTP_SUBTYPE_CONSTRUCTOR(_name, _type, _elt) \
-static inline sctp_subtype_t \
-SCTP_ST_## _name (_type _arg) \
-{ sctp_subtype_t _retval; _retval._elt = _arg; return _retval; }
-
-SCTP_SUBTYPE_CONSTRUCTOR(CHUNK, sctp_cid_t, chunk)
-SCTP_SUBTYPE_CONSTRUCTOR(TIMEOUT, sctp_event_timeout_t, timeout)
-SCTP_SUBTYPE_CONSTRUCTOR(OTHER, sctp_event_other_t, other)
-SCTP_SUBTYPE_CONSTRUCTOR(PRIMITIVE, sctp_event_primitive_t, primitive)
-
-
-#define sctp_chunk_is_data(a) (a->chunk_hdr->type == SCTP_CID_DATA)
-
-/* Calculate the actual data size in a data chunk */
-#define SCTP_DATA_SNDSIZE(c) ((int)((unsigned long)(c->chunk_end)\
- - (unsigned long)(c->chunk_hdr)\
- - sizeof(sctp_data_chunk_t)))
-
-/* Internal error codes */
-typedef enum {
-
- SCTP_IERROR_NO_ERROR = 0,
- SCTP_IERROR_BASE = 1000,
- SCTP_IERROR_NO_COOKIE,
- SCTP_IERROR_BAD_SIG,
- SCTP_IERROR_STALE_COOKIE,
- SCTP_IERROR_NOMEM,
- SCTP_IERROR_MALFORMED,
- SCTP_IERROR_BAD_TAG,
- SCTP_IERROR_BIG_GAP,
- SCTP_IERROR_DUP_TSN,
- SCTP_IERROR_HIGH_TSN,
- SCTP_IERROR_IGNORE_TSN,
- SCTP_IERROR_NO_DATA,
- SCTP_IERROR_BAD_STREAM,
- SCTP_IERROR_BAD_PORTS,
- SCTP_IERROR_AUTH_BAD_HMAC,
- SCTP_IERROR_AUTH_BAD_KEYID,
- SCTP_IERROR_PROTO_VIOLATION,
- SCTP_IERROR_ERROR,
- SCTP_IERROR_ABORT,
-} sctp_ierror_t;
-
-
-
-/* SCTP state defines for internal state machine */
-typedef enum {
-
- SCTP_STATE_CLOSED = 0,
- SCTP_STATE_COOKIE_WAIT = 1,
- SCTP_STATE_COOKIE_ECHOED = 2,
- SCTP_STATE_ESTABLISHED = 3,
- SCTP_STATE_SHUTDOWN_PENDING = 4,
- SCTP_STATE_SHUTDOWN_SENT = 5,
- SCTP_STATE_SHUTDOWN_RECEIVED = 6,
- SCTP_STATE_SHUTDOWN_ACK_SENT = 7,
-
-} sctp_state_t;
-
-#define SCTP_STATE_MAX SCTP_STATE_SHUTDOWN_ACK_SENT
-#define SCTP_STATE_NUM_STATES (SCTP_STATE_MAX + 1)
-
-/* These are values for sk->state.
- * For a UDP-style SCTP socket, the states are defined as follows
- * - A socket in SCTP_SS_CLOSED state indicates that it is not willing to
- * accept new associations, but it can initiate the creation of new ones.
- * - A socket in SCTP_SS_LISTENING state indicates that it is willing to
- * accept new associations and can initiate the creation of new ones.
- * - A socket in SCTP_SS_ESTABLISHED state indicates that it is a peeled off
- * socket with one association.
- * For a TCP-style SCTP socket, the states are defined as follows
- * - A socket in SCTP_SS_CLOSED state indicates that it is not willing to
- * accept new associations, but it can initiate the creation of new ones.
- * - A socket in SCTP_SS_LISTENING state indicates that it is willing to
- * accept new associations, but cannot initiate the creation of new ones.
- * - A socket in SCTP_SS_ESTABLISHED state indicates that it has a single
- * association.
- */
-typedef enum {
- SCTP_SS_CLOSED = TCP_CLOSE,
- SCTP_SS_LISTENING = TCP_LISTEN,
- SCTP_SS_ESTABLISHING = TCP_SYN_SENT,
- SCTP_SS_ESTABLISHED = TCP_ESTABLISHED,
- SCTP_SS_CLOSING = TCP_CLOSING,
-} sctp_sock_state_t;
-
-/* These functions map various type to printable names. */
-const char *sctp_cname(const sctp_subtype_t); /* chunk types */
-const char *sctp_oname(const sctp_subtype_t); /* other events */
-const char *sctp_tname(const sctp_subtype_t); /* timeouts */
-const char *sctp_pname(const sctp_subtype_t); /* primitives */
-
-/* This is a table of printable names of sctp_state_t's. */
-extern const char *const sctp_state_tbl[];
-extern const char *const sctp_evttype_tbl[];
-extern const char *const sctp_status_tbl[];
-
-/* Maximum chunk length considering padding requirements. */
-enum { SCTP_MAX_CHUNK_LEN = ((1<<16) - sizeof(__u32)) };
-
-/* Encourage Cookie-Echo bundling by pre-fragmenting chunks a little
- * harder (until reaching ESTABLISHED state).
- */
-enum { SCTP_ARBITRARY_COOKIE_ECHO_LEN = 200 };
-
-/* Guess at how big to make the TSN mapping array.
- * We guarantee that we can handle at least this big a gap between the
- * cumulative ACK and the highest TSN. In practice, we can often
- * handle up to twice this value.
- *
- * NEVER make this more than 32767 (2^15-1). The Gap Ack Blocks in a
- * SACK (see section 3.3.4) are only 16 bits, so 2*SCTP_TSN_MAP_SIZE
- * must be less than 65535 (2^16 - 1), or we will have overflow
- * problems creating SACK's.
- */
-#define SCTP_TSN_MAP_INITIAL BITS_PER_LONG
-#define SCTP_TSN_MAP_INCREMENT SCTP_TSN_MAP_INITIAL
-#define SCTP_TSN_MAP_SIZE 4096
-
-/* We will not record more than this many duplicate TSNs between two
- * SACKs. The minimum PMTU is 576. Remove all the headers and there
- * is enough room for 131 duplicate reports. Round down to the
- * nearest power of 2.
- */
-enum { SCTP_MIN_PMTU = 576 };
-enum { SCTP_MAX_DUP_TSNS = 16 };
-enum { SCTP_MAX_GABS = 16 };
-
-/* Heartbeat interval - 30 secs */
-#define SCTP_DEFAULT_TIMEOUT_HEARTBEAT (30*1000)
-
-/* Delayed sack timer - 200ms */
-#define SCTP_DEFAULT_TIMEOUT_SACK (200)
-
-/* RTO.Initial - 3 seconds
- * RTO.Min - 1 second
- * RTO.Max - 60 seconds
- * RTO.Alpha - 1/8
- * RTO.Beta - 1/4
- */
-#define SCTP_RTO_INITIAL (3 * 1000)
-#define SCTP_RTO_MIN (1 * 1000)
-#define SCTP_RTO_MAX (60 * 1000)
-
-#define SCTP_RTO_ALPHA 3 /* 1/8 when converted to right shifts. */
-#define SCTP_RTO_BETA 2 /* 1/4 when converted to right shifts. */
-
-/* Maximum number of new data packets that can be sent in a burst. */
-#define SCTP_DEFAULT_MAX_BURST 4
-
-#define SCTP_CLOCK_GRANULARITY 1 /* 1 jiffy */
-
-#define SCTP_DEFAULT_COOKIE_LIFE (60 * 1000) /* 60 seconds */
-
-#define SCTP_DEFAULT_MINWINDOW 1500 /* default minimum rwnd size */
-#define SCTP_DEFAULT_MAXWINDOW 65535 /* default rwnd size */
-#define SCTP_DEFAULT_RWND_SHIFT 4 /* by default, update on 1/16 of
- * rcvbuf, which is 1/8 of initial
- * window
- */
-#define SCTP_DEFAULT_MAXSEGMENT 1500 /* MTU size, this is the limit
- * to which we will raise the P-MTU.
- */
-#define SCTP_DEFAULT_MINSEGMENT 512 /* MTU size ... if no mtu disc */
-#define SCTP_HOW_MANY_SECRETS 2 /* How many secrets I keep */
-#define SCTP_SECRET_SIZE 32 /* Number of octets in a 256 bits. */
-
-#define SCTP_SIGNATURE_SIZE 20 /* size of a SLA-1 signature */
-
-#define SCTP_COOKIE_MULTIPLE 32 /* Pad out our cookie to make our hash
- * functions simpler to write.
- */
-
-#if defined (CONFIG_SCTP_HMAC_MD5)
-#define SCTP_COOKIE_HMAC_ALG "hmac(md5)"
-#elif defined (CONFIG_SCTP_HMAC_SHA1)
-#define SCTP_COOKIE_HMAC_ALG "hmac(sha1)"
-#else
-#define SCTP_COOKIE_HMAC_ALG NULL
-#endif
-
-/* These return values describe the success or failure of a number of
- * routines which form the lower interface to SCTP_outqueue.
- */
-typedef enum {
- SCTP_XMIT_OK,
- SCTP_XMIT_PMTU_FULL,
- SCTP_XMIT_RWND_FULL,
- SCTP_XMIT_NAGLE_DELAY,
-} sctp_xmit_t;
-
-/* These are the commands for manipulating transports. */
-typedef enum {
- SCTP_TRANSPORT_UP,
- SCTP_TRANSPORT_DOWN,
-} sctp_transport_cmd_t;
-
-/* These are the address scopes defined mainly for IPv4 addresses
- * based on draft of SCTP IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
- * These scopes are hopefully generic enough to be used on scoping both
- * IPv4 and IPv6 addresses in SCTP.
- * At this point, the IPv6 scopes will be mapped to these internal scopes
- * as much as possible.
- */
-typedef enum {
- SCTP_SCOPE_GLOBAL, /* IPv4 global addresses */
- SCTP_SCOPE_PRIVATE, /* IPv4 private addresses */
- SCTP_SCOPE_LINK, /* IPv4 link local address */
- SCTP_SCOPE_LOOPBACK, /* IPv4 loopback address */
- SCTP_SCOPE_UNUSABLE, /* IPv4 unusable addresses */
-} sctp_scope_t;
-
-typedef enum {
- SCTP_SCOPE_POLICY_DISABLE, /* Disable IPv4 address scoping */
- SCTP_SCOPE_POLICY_ENABLE, /* Enable IPv4 address scoping */
- SCTP_SCOPE_POLICY_PRIVATE, /* Follow draft but allow IPv4 private addresses */
- SCTP_SCOPE_POLICY_LINK, /* Follow draft but allow IPv4 link local addresses */
-} sctp_scope_policy_t;
-
-/* Based on IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>,
- * SCTP IPv4 unusable addresses: 0.0.0.0/8, 224.0.0.0/4, 198.18.0.0/24,
- * 192.88.99.0/24.
- * Also, RFC 8.4, non-unicast addresses are not considered valid SCTP
- * addresses.
- */
-#define IS_IPV4_UNUSABLE_ADDRESS(a) \
- ((htonl(INADDR_BROADCAST) == a) || \
- ipv4_is_multicast(a) || \
- ipv4_is_zeronet(a) || \
- ipv4_is_test_198(a) || \
- ipv4_is_anycast_6to4(a))
-
-/* Flags used for the bind address copy functions. */
-#define SCTP_ADDR6_ALLOWED 0x00000001 /* IPv6 address is allowed by
- local sock family */
-#define SCTP_ADDR4_PEERSUPP 0x00000002 /* IPv4 address is supported by
- peer */
-#define SCTP_ADDR6_PEERSUPP 0x00000004 /* IPv6 address is supported by
- peer */
-
-/* Reasons to retransmit. */
-typedef enum {
- SCTP_RTXR_T3_RTX,
- SCTP_RTXR_FAST_RTX,
- SCTP_RTXR_PMTUD,
- SCTP_RTXR_T1_RTX,
-} sctp_retransmit_reason_t;
-
-/* Reasons to lower cwnd. */
-typedef enum {
- SCTP_LOWER_CWND_T3_RTX,
- SCTP_LOWER_CWND_FAST_RTX,
- SCTP_LOWER_CWND_ECNE,
- SCTP_LOWER_CWND_INACTIVE,
-} sctp_lower_cwnd_t;
-
-
-/* SCTP-AUTH Necessary constants */
-
-/* SCTP-AUTH, Section 3.3
- *
- * The following Table 2 shows the currently defined values for HMAC
- * identifiers.
- *
- * +-----------------+--------------------------+
- * | HMAC Identifier | Message Digest Algorithm |
- * +-----------------+--------------------------+
- * | 0 | Reserved |
- * | 1 | SHA-1 defined in [8] |
- * | 2 | Reserved |
- * | 3 | SHA-256 defined in [8] |
- * +-----------------+--------------------------+
- */
-enum {
- SCTP_AUTH_HMAC_ID_RESERVED_0,
- SCTP_AUTH_HMAC_ID_SHA1,
- SCTP_AUTH_HMAC_ID_RESERVED_2,
-#if defined (CONFIG_CRYPTO_SHA256) || defined (CONFIG_CRYPTO_SHA256_MODULE)
- SCTP_AUTH_HMAC_ID_SHA256,
-#endif
- __SCTP_AUTH_HMAC_MAX
-};
-
-#define SCTP_AUTH_HMAC_ID_MAX __SCTP_AUTH_HMAC_MAX - 1
-#define SCTP_AUTH_NUM_HMACS __SCTP_AUTH_HMAC_MAX
-#define SCTP_SHA1_SIG_SIZE 20
-#define SCTP_SHA256_SIG_SIZE 32
-
-/* SCTP-AUTH, Section 3.2
- * The chunk types for INIT, INIT-ACK, SHUTDOWN-COMPLETE and AUTH chunks
- * MUST NOT be listed in the CHUNKS parameter
- */
-#define SCTP_NUM_NOAUTH_CHUNKS 4
-#define SCTP_AUTH_MAX_CHUNKS (SCTP_NUM_CHUNK_TYPES - SCTP_NUM_NOAUTH_CHUNKS)
-
-/* SCTP-AUTH Section 6.1
- * The RANDOM parameter MUST contain a 32 byte random number.
- */
-#define SCTP_AUTH_RANDOM_LENGTH 32
-
-#endif /* __sctp_constants_h__ */
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