446 lines
14 KiB
C
446 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/* 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
|
|
*
|
|
* Please send any bug reports or fixes you make to the
|
|
* email address(es):
|
|
* lksctp developers <linux-sctp@vger.kernel.org>
|
|
*
|
|
* 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>
|
|
*/
|
|
|
|
#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 enum sctp_sock_state */
|
|
|
|
/* 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_RECONF_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_RECONF_CHUNK_TYPES +\
|
|
SCTP_NUM_AUTH_CHUNK_TYPES)
|
|
|
|
/* These are the different flavours of event. */
|
|
enum sctp_event_type {
|
|
SCTP_EVENT_T_CHUNK = 1,
|
|
SCTP_EVENT_T_TIMEOUT,
|
|
SCTP_EVENT_T_OTHER,
|
|
SCTP_EVENT_T_PRIMITIVE
|
|
};
|
|
|
|
/* As a convenience for the state machine, we append SCTP_EVENT_* and
|
|
* SCTP_ULP_* to the list of possible chunks.
|
|
*/
|
|
|
|
enum sctp_event_timeout {
|
|
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_RECONF,
|
|
SCTP_EVENT_TIMEOUT_PROBE,
|
|
SCTP_EVENT_TIMEOUT_SACK,
|
|
SCTP_EVENT_TIMEOUT_AUTOCLOSE,
|
|
};
|
|
|
|
#define SCTP_EVENT_TIMEOUT_MAX SCTP_EVENT_TIMEOUT_AUTOCLOSE
|
|
#define SCTP_NUM_TIMEOUT_TYPES (SCTP_EVENT_TIMEOUT_MAX + 1)
|
|
|
|
enum sctp_event_other {
|
|
SCTP_EVENT_NO_PENDING_TSN = 0,
|
|
SCTP_EVENT_ICMP_PROTO_UNREACH,
|
|
};
|
|
|
|
#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. */
|
|
enum sctp_event_primitive {
|
|
SCTP_PRIMITIVE_ASSOCIATE = 0,
|
|
SCTP_PRIMITIVE_SHUTDOWN,
|
|
SCTP_PRIMITIVE_ABORT,
|
|
SCTP_PRIMITIVE_SEND,
|
|
SCTP_PRIMITIVE_REQUESTHEARTBEAT,
|
|
SCTP_PRIMITIVE_ASCONF,
|
|
SCTP_PRIMITIVE_RECONF,
|
|
};
|
|
|
|
#define SCTP_EVENT_PRIMITIVE_MAX SCTP_PRIMITIVE_RECONF
|
|
#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:
|
|
*
|
|
* union sctp_subtype foo = SCTP_ST_CHUNK(SCTP_CID_INIT);
|
|
*/
|
|
|
|
union sctp_subtype {
|
|
enum sctp_cid chunk;
|
|
enum sctp_event_timeout timeout;
|
|
enum sctp_event_other other;
|
|
enum sctp_event_primitive primitive;
|
|
};
|
|
|
|
#define SCTP_SUBTYPE_CONSTRUCTOR(_name, _type, _elt) \
|
|
static inline union sctp_subtype \
|
|
SCTP_ST_## _name (_type _arg) \
|
|
{ union sctp_subtype _retval; _retval._elt = _arg; return _retval; }
|
|
|
|
SCTP_SUBTYPE_CONSTRUCTOR(CHUNK, enum sctp_cid, chunk)
|
|
SCTP_SUBTYPE_CONSTRUCTOR(TIMEOUT, enum sctp_event_timeout, timeout)
|
|
SCTP_SUBTYPE_CONSTRUCTOR(OTHER, enum sctp_event_other, other)
|
|
SCTP_SUBTYPE_CONSTRUCTOR(PRIMITIVE, enum sctp_event_primitive, primitive)
|
|
|
|
|
|
#define sctp_chunk_is_data(a) (a->chunk_hdr->type == SCTP_CID_DATA || \
|
|
a->chunk_hdr->type == SCTP_CID_I_DATA)
|
|
|
|
/* Internal error codes */
|
|
enum sctp_ierror {
|
|
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 state defines for internal state machine */
|
|
enum sctp_state {
|
|
|
|
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,
|
|
|
|
};
|
|
|
|
#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.
|
|
*/
|
|
enum sctp_sock_state {
|
|
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,
|
|
};
|
|
|
|
enum sctp_plpmtud_state {
|
|
SCTP_PL_DISABLED,
|
|
SCTP_PL_BASE,
|
|
SCTP_PL_SEARCH,
|
|
SCTP_PL_COMPLETE,
|
|
SCTP_PL_ERROR,
|
|
};
|
|
|
|
#define SCTP_BASE_PLPMTU 1200
|
|
#define SCTP_MAX_PLPMTU 9000
|
|
#define SCTP_MIN_PLPMTU 512
|
|
|
|
#define SCTP_MAX_PROBES 3
|
|
|
|
#define SCTP_PL_BIG_STEP 32
|
|
#define SCTP_PL_MIN_STEP 4
|
|
|
|
/* These functions map various type to printable names. */
|
|
const char *sctp_cname(const union sctp_subtype id); /* chunk types */
|
|
const char *sctp_oname(const union sctp_subtype id); /* other events */
|
|
const char *sctp_tname(const union sctp_subtype id); /* timeouts */
|
|
const char *sctp_pname(const union sctp_subtype id); /* 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 512. Remove all the headers and there
|
|
* is enough room for 117 duplicate reports. Round down to the
|
|
* nearest power of 2.
|
|
*/
|
|
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.
|
|
*/
|
|
|
|
#define SCTP_DEFAULT_UDP_PORT 9899 /* default UDP tunneling port */
|
|
|
|
/* These are the values for pf exposure, UNUSED is to keep compatible with old
|
|
* applications by default.
|
|
*/
|
|
enum {
|
|
SCTP_PF_EXPOSE_UNSET,
|
|
SCTP_PF_EXPOSE_DISABLE,
|
|
SCTP_PF_EXPOSE_ENABLE,
|
|
};
|
|
#define SCTP_PF_EXPOSE_MAX SCTP_PF_EXPOSE_ENABLE
|
|
|
|
#define SCTP_PS_RETRANS_MAX 0xffff
|
|
|
|
/* These return values describe the success or failure of a number of
|
|
* routines which form the lower interface to SCTP_outqueue.
|
|
*/
|
|
enum sctp_xmit {
|
|
SCTP_XMIT_OK,
|
|
SCTP_XMIT_PMTU_FULL,
|
|
SCTP_XMIT_RWND_FULL,
|
|
SCTP_XMIT_DELAY,
|
|
};
|
|
|
|
/* These are the commands for manipulating transports. */
|
|
enum sctp_transport_cmd {
|
|
SCTP_TRANSPORT_UP,
|
|
SCTP_TRANSPORT_DOWN,
|
|
SCTP_TRANSPORT_PF,
|
|
};
|
|
|
|
/* 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.
|
|
*/
|
|
enum sctp_scope {
|
|
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 */
|
|
};
|
|
|
|
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 */
|
|
};
|
|
|
|
#define SCTP_SCOPE_POLICY_MAX SCTP_SCOPE_POLICY_LINK
|
|
|
|
/* 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, 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_anycast_6to4(a))
|
|
|
|
/* Flags used for the bind address copy functions. */
|
|
#define SCTP_ADDR4_ALLOWED 0x00000001 /* IPv4 address is allowed by
|
|
local sock family */
|
|
#define SCTP_ADDR6_ALLOWED 0x00000002 /* IPv6 address is allowed by
|
|
local sock family */
|
|
#define SCTP_ADDR4_PEERSUPP 0x00000004 /* IPv4 address is supported by
|
|
peer */
|
|
#define SCTP_ADDR6_PEERSUPP 0x00000008 /* IPv6 address is supported by
|
|
peer */
|
|
|
|
/* Reasons to retransmit. */
|
|
enum sctp_retransmit_reason {
|
|
SCTP_RTXR_T3_RTX,
|
|
SCTP_RTXR_FAST_RTX,
|
|
SCTP_RTXR_PMTUD,
|
|
SCTP_RTXR_T1_RTX,
|
|
};
|
|
|
|
/* Reasons to lower cwnd. */
|
|
enum sctp_lower_cwnd {
|
|
SCTP_LOWER_CWND_T3_RTX,
|
|
SCTP_LOWER_CWND_FAST_RTX,
|
|
SCTP_LOWER_CWND_ECNE,
|
|
SCTP_LOWER_CWND_INACTIVE,
|
|
};
|
|
|
|
|
|
/* 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
|
|
|
|
#define SCTP_PROBE_TIMER_MIN 5000
|
|
|
|
#endif /* __sctp_constants_h__ */
|