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constants.h
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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, see * <http://www.gnu.org/licenses/>. * * 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/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_CLOSE_WAIT, } 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_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. */ /* 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_PF, } 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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