[thirdparty/kernel/stable.git] / include / net / sctp / constants.h

/* 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 <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 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_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.  */
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_RECONF,
	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_PRIMITIVE_RECONF,
} sctp_event_primitive_t;

#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:
 *
 * 	sctp_subtype_t foo = SCTP_ST_CHUNK(SCTP_CID_INIT);
 */

typedef union {
	enum sctp_cid 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,		enum sctp_cid,		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(struct sctp_data_chunk)))

/* 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_DELAY,
} sctp_xmit_t;

/* 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, 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. */
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

#endif /* __sctp_constants_h__ */
Commit	Line	Data
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
a6227e26 JK	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>
1da177e4 LT	44	#include <linux/ipv6.h> /* For ipv6hdr. */
c752f073	45	#include <net/tcp_states.h> /* For TCP states used in sctp_sock_state_t */
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
1da177e4 LT	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
d884aa63 XL	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)
1f485649 VY	72
1da177e4 LT	73	/* These are the different flavours of event. */
	74	typedef enum {
	75
	76	SCTP_EVENT_T_CHUNK = 1,
	77	SCTP_EVENT_T_TIMEOUT,
	78	SCTP_EVENT_T_OTHER,
	79	SCTP_EVENT_T_PRIMITIVE
	80
	81	} sctp_event_t;
	82
1da177e4 LT	83	/* As a convenience for the state machine, we append SCTP_EVENT_* and
	84	* SCTP_ULP_* to the list of possible chunks.
	85	*/
	86
	87	typedef enum {
	88	SCTP_EVENT_TIMEOUT_NONE = 0,
	89	SCTP_EVENT_TIMEOUT_T1_COOKIE,
	90	SCTP_EVENT_TIMEOUT_T1_INIT,
	91	SCTP_EVENT_TIMEOUT_T2_SHUTDOWN,
	92	SCTP_EVENT_TIMEOUT_T3_RTX,
	93	SCTP_EVENT_TIMEOUT_T4_RTO,
	94	SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD,
	95	SCTP_EVENT_TIMEOUT_HEARTBEAT,
7b9438de	96	SCTP_EVENT_TIMEOUT_RECONF,
1da177e4 LT	97	SCTP_EVENT_TIMEOUT_SACK,
	98	SCTP_EVENT_TIMEOUT_AUTOCLOSE,
	99	} sctp_event_timeout_t;
	100
	101	#define SCTP_EVENT_TIMEOUT_MAX SCTP_EVENT_TIMEOUT_AUTOCLOSE
	102	#define SCTP_NUM_TIMEOUT_TYPES (SCTP_EVENT_TIMEOUT_MAX + 1)
	103
	104	typedef enum {
	105	SCTP_EVENT_NO_PENDING_TSN = 0,
	106	SCTP_EVENT_ICMP_PROTO_UNREACH,
	107	} sctp_event_other_t;
	108
	109	#define SCTP_EVENT_OTHER_MAX SCTP_EVENT_ICMP_PROTO_UNREACH
	110	#define SCTP_NUM_OTHER_TYPES (SCTP_EVENT_OTHER_MAX + 1)
	111
	112	/* These are primitive requests from the ULP. */
	113	typedef enum {
	114	SCTP_PRIMITIVE_ASSOCIATE = 0,
	115	SCTP_PRIMITIVE_SHUTDOWN,
	116	SCTP_PRIMITIVE_ABORT,
	117	SCTP_PRIMITIVE_SEND,
	118	SCTP_PRIMITIVE_REQUESTHEARTBEAT,
	119	SCTP_PRIMITIVE_ASCONF,
7a090b04	120	SCTP_PRIMITIVE_RECONF,
1da177e4 LT	121	} sctp_event_primitive_t;
1da177e4 LT	122
7a090b04	123	#define SCTP_EVENT_PRIMITIVE_MAX SCTP_PRIMITIVE_RECONF
1da177e4 LT	124	#define SCTP_NUM_PRIMITIVE_TYPES (SCTP_EVENT_PRIMITIVE_MAX + 1)
	125
	126	/* We define here a utility type for manipulating subtypes.
	127	* The subtype constructors all work like this:
	128	*
	129	* sctp_subtype_t foo = SCTP_ST_CHUNK(SCTP_CID_INIT);
	130	*/
	131
	132	typedef union {
6d85e68f	133	enum sctp_cid chunk;
1da177e4 LT	134	sctp_event_timeout_t timeout;
	135	sctp_event_other_t other;
	136	sctp_event_primitive_t primitive;
	137	} sctp_subtype_t;
	138
	139	#define SCTP_SUBTYPE_CONSTRUCTOR(_name, _type, _elt) \
	140	static inline sctp_subtype_t \
	141	SCTP_ST_## _name (_type _arg) \
	142	{ sctp_subtype_t _retval; _retval._elt = _arg; return _retval; }
	143
6d85e68f	144	SCTP_SUBTYPE_CONSTRUCTOR(CHUNK, enum sctp_cid, chunk)
1da177e4 LT	145	SCTP_SUBTYPE_CONSTRUCTOR(TIMEOUT, sctp_event_timeout_t, timeout)
	146	SCTP_SUBTYPE_CONSTRUCTOR(OTHER, sctp_event_other_t, other)
	147	SCTP_SUBTYPE_CONSTRUCTOR(PRIMITIVE, sctp_event_primitive_t, primitive)
	148
	149
1da177e4 LT	150	#define sctp_chunk_is_data(a) (a->chunk_hdr->type == SCTP_CID_DATA)
	151
	152	/* Calculate the actual data size in a data chunk */
	153	#define SCTP_DATA_SNDSIZE(c) ((int)((unsigned long)(c->chunk_end)\
	154	- (unsigned long)(c->chunk_hdr)\
9f8d3147	155	- sizeof(struct sctp_data_chunk)))
1da177e4	156
1da177e4 LT	157	/* Internal error codes */
	158	typedef enum {
	159
	160	SCTP_IERROR_NO_ERROR = 0,
	161	SCTP_IERROR_BASE = 1000,
	162	SCTP_IERROR_NO_COOKIE,
	163	SCTP_IERROR_BAD_SIG,
	164	SCTP_IERROR_STALE_COOKIE,
	165	SCTP_IERROR_NOMEM,
	166	SCTP_IERROR_MALFORMED,
	167	SCTP_IERROR_BAD_TAG,
	168	SCTP_IERROR_BIG_GAP,
	169	SCTP_IERROR_DUP_TSN,
	170	SCTP_IERROR_HIGH_TSN,
	171	SCTP_IERROR_IGNORE_TSN,
	172	SCTP_IERROR_NO_DATA,
	173	SCTP_IERROR_BAD_STREAM,
	174	SCTP_IERROR_BAD_PORTS,
bbd0d598 VY	175	SCTP_IERROR_AUTH_BAD_HMAC,
	176	SCTP_IERROR_AUTH_BAD_KEYID,
	177	SCTP_IERROR_PROTO_VIOLATION,
7ab90804 VY	178	SCTP_IERROR_ERROR,
7ab90804 VY	179	SCTP_IERROR_ABORT,
1da177e4 LT	180	} sctp_ierror_t;
	181
	182
	183
	184	/* SCTP state defines for internal state machine */
	185	typedef enum {
	186
0b8f9e25 VY	187	SCTP_STATE_CLOSED = 0,
	188	SCTP_STATE_COOKIE_WAIT = 1,
	189	SCTP_STATE_COOKIE_ECHOED = 2,
	190	SCTP_STATE_ESTABLISHED = 3,
	191	SCTP_STATE_SHUTDOWN_PENDING = 4,
	192	SCTP_STATE_SHUTDOWN_SENT = 5,
	193	SCTP_STATE_SHUTDOWN_RECEIVED = 6,
	194	SCTP_STATE_SHUTDOWN_ACK_SENT = 7,
1da177e4 LT	195
	196	} sctp_state_t;
	197
	198	#define SCTP_STATE_MAX SCTP_STATE_SHUTDOWN_ACK_SENT
	199	#define SCTP_STATE_NUM_STATES (SCTP_STATE_MAX + 1)
	200
	201	/* These are values for sk->state.
	202	* For a UDP-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 and can initiate the creation of new ones.
	207	* - A socket in SCTP_SS_ESTABLISHED state indicates that it is a peeled off
	208	* socket with one association.
	209	* For a TCP-style SCTP socket, the states are defined as follows
	210	* - A socket in SCTP_SS_CLOSED state indicates that it is not willing to
	211	* accept new associations, but it can initiate the creation of new ones.
	212	* - A socket in SCTP_SS_LISTENING state indicates that it is willing to
	213	* accept new associations, but cannot initiate the creation of new ones.
	214	* - A socket in SCTP_SS_ESTABLISHED state indicates that it has a single
	215	* association.
	216	*/
	217	typedef enum {
	218	SCTP_SS_CLOSED = TCP_CLOSE,
	219	SCTP_SS_LISTENING = TCP_LISTEN,
	220	SCTP_SS_ESTABLISHING = TCP_SYN_SENT,
	221	SCTP_SS_ESTABLISHED = TCP_ESTABLISHED,
df7e88f6	222	SCTP_SS_CLOSING = TCP_CLOSE_WAIT,
1da177e4 LT	223	} sctp_sock_state_t;
	224
	225	/* These functions map various type to printable names. */
	226	const char sctp_cname(const sctp_subtype_t); / chunk types */
	227	const char sctp_oname(const sctp_subtype_t); / other events */
	228	const char sctp_tname(const sctp_subtype_t); / timeouts */
	229	const char sctp_pname(const sctp_subtype_t); / primitives */
	230
	231	/* This is a table of printable names of sctp_state_t's. */
36cbd3dc JE	232	extern const char *const sctp_state_tbl[];
	233	extern const char *const sctp_evttype_tbl[];
	234	extern const char *const sctp_status_tbl[];
1da177e4 LT	235
	236	/* Maximum chunk length considering padding requirements. */
	237	enum { SCTP_MAX_CHUNK_LEN = ((1<<16) - sizeof(__u32)) };
	238
	239	/* Encourage Cookie-Echo bundling by pre-fragmenting chunks a little
	240	* harder (until reaching ESTABLISHED state).
	241	*/
	242	enum { SCTP_ARBITRARY_COOKIE_ECHO_LEN = 200 };
	243
	244	/* Guess at how big to make the TSN mapping array.
	245	* We guarantee that we can handle at least this big a gap between the
	246	* cumulative ACK and the highest TSN. In practice, we can often
	247	* handle up to twice this value.
	248	*
	249	* NEVER make this more than 32767 (2^15-1). The Gap Ack Blocks in a
	250	* SACK (see section 3.3.4) are only 16 bits, so 2*SCTP_TSN_MAP_SIZE
	251	* must be less than 65535 (2^16 - 1), or we will have overflow
	252	* problems creating SACK's.
	253	*/
8e1ee18c VY	254	#define SCTP_TSN_MAP_INITIAL BITS_PER_LONG
	255	#define SCTP_TSN_MAP_INCREMENT SCTP_TSN_MAP_INITIAL
	256	#define SCTP_TSN_MAP_SIZE 4096
1da177e4 LT	257
	258	/* We will not record more than this many duplicate TSNs between two
	259	* SACKs. The minimum PMTU is 576. Remove all the headers and there
	260	* is enough room for 131 duplicate reports. Round down to the
	261	* nearest power of 2.
	262	*/
	263	enum { SCTP_MIN_PMTU = 576 };
	264	enum { SCTP_MAX_DUP_TSNS = 16 };
	265	enum { SCTP_MAX_GABS = 16 };
	266
2f85a429	267	/* Heartbeat interval - 30 secs */
3fd091e7	268	#define SCTP_DEFAULT_TIMEOUT_HEARTBEAT (30*1000)
1da177e4	269
2f85a429	270	/* Delayed sack timer - 200ms */
3fd091e7	271	#define SCTP_DEFAULT_TIMEOUT_SACK (200)
1da177e4 LT	272
	273	/* RTO.Initial - 3 seconds
	274	* RTO.Min - 1 second
	275	* RTO.Max - 60 seconds
	276	* RTO.Alpha - 1/8
	277	* RTO.Beta - 1/4
	278	*/
3fd091e7 VY	279	#define SCTP_RTO_INITIAL (3 * 1000)
	280	#define SCTP_RTO_MIN (1 * 1000)
	281	#define SCTP_RTO_MAX (60 * 1000)
1da177e4 LT	282
	283	#define SCTP_RTO_ALPHA 3 /* 1/8 when converted to right shifts. */
	284	#define SCTP_RTO_BETA 2 /* 1/4 when converted to right shifts. */
	285
	286	/* Maximum number of new data packets that can be sent in a burst. */
70331571	287	#define SCTP_DEFAULT_MAX_BURST 4
1da177e4 LT	288
	289	#define SCTP_CLOCK_GRANULARITY 1 /* 1 jiffy */
	290
3fd091e7	291	#define SCTP_DEFAULT_COOKIE_LIFE (60 * 1000) /* 60 seconds */
1da177e4 LT	292
	293	#define SCTP_DEFAULT_MINWINDOW 1500 /* default minimum rwnd size */
	294	#define SCTP_DEFAULT_MAXWINDOW 65535 /* default rwnd size */
90f2f531 VY	295	#define SCTP_DEFAULT_RWND_SHIFT 4 /* by default, update on 1/16 of
	296	* rcvbuf, which is 1/8 of initial
	297	* window
	298	*/
1da177e4 LT	299	#define SCTP_DEFAULT_MAXSEGMENT 1500 /* MTU size, this is the limit
	300	* to which we will raise the P-MTU.
	301	*/
	302	#define SCTP_DEFAULT_MINSEGMENT 512 /* MTU size ... if no mtu disc */
570617e7	303
1da177e4 LT	304	#define SCTP_SECRET_SIZE 32 /* Number of octets in a 256 bits. */
	305
	306	#define SCTP_SIGNATURE_SIZE 20 /* size of a SLA-1 signature */
	307
	308	#define SCTP_COOKIE_MULTIPLE 32 /* Pad out our cookie to make our hash
	309	* functions simpler to write.
	310	*/
	311
1da177e4 LT	312	/* These return values describe the success or failure of a number of
	313	* routines which form the lower interface to SCTP_outqueue.
	314	*/
	315	typedef enum {
	316	SCTP_XMIT_OK,
	317	SCTP_XMIT_PMTU_FULL,
	318	SCTP_XMIT_RWND_FULL,
526cbef7	319	SCTP_XMIT_DELAY,
1da177e4 LT	320	} sctp_xmit_t;
	321
	322	/* These are the commands for manipulating transports. */
0ceaeebe	323	enum sctp_transport_cmd {
1da177e4 LT	324	SCTP_TRANSPORT_UP,
1da177e4 LT	325	SCTP_TRANSPORT_DOWN,
5aa93bcf	326	SCTP_TRANSPORT_PF,
0ceaeebe	327	};
1da177e4 LT	328
	329	/* These are the address scopes defined mainly for IPv4 addresses
	330	* based on draft of SCTP IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
	331	* These scopes are hopefully generic enough to be used on scoping both
	332	* IPv4 and IPv6 addresses in SCTP.
	333	* At this point, the IPv6 scopes will be mapped to these internal scopes
	334	* as much as possible.
	335	*/
1c662018	336	enum sctp_scope {
1da177e4 LT	337	SCTP_SCOPE_GLOBAL, /* IPv4 global addresses */
	338	SCTP_SCOPE_PRIVATE, /* IPv4 private addresses */
	339	SCTP_SCOPE_LINK, /* IPv4 link local address */
	340	SCTP_SCOPE_LOOPBACK, /* IPv4 loopback address */
	341	SCTP_SCOPE_UNUSABLE, /* IPv4 unusable addresses */
1c662018	342	};
1da177e4	343
701ef3e6	344	enum {
72388433 BD	345	SCTP_SCOPE_POLICY_DISABLE, /* Disable IPv4 address scoping */
	346	SCTP_SCOPE_POLICY_ENABLE, /* Enable IPv4 address scoping */
	347	SCTP_SCOPE_POLICY_PRIVATE, /* Follow draft but allow IPv4 private addresses */
	348	SCTP_SCOPE_POLICY_LINK, /* Follow draft but allow IPv4 link local addresses */
701ef3e6 XL	349	};
	350
	351	#define SCTP_SCOPE_POLICY_MAX SCTP_SCOPE_POLICY_LINK
72388433	352
1da177e4 LT	353	/* Based on IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>,
	354	* SCTP IPv4 unusable addresses: 0.0.0.0/8, 224.0.0.0/4, 198.18.0.0/24,
	355	* 192.88.99.0/24.
	356	* Also, RFC 8.4, non-unicast addresses are not considered valid SCTP
	357	* addresses.
	358	*/
b5cb2bbc JP	359	#define IS_IPV4_UNUSABLE_ADDRESS(a) \
	360	((htonl(INADDR_BROADCAST) == a) \|\| \
	361	ipv4_is_multicast(a) \|\| \
	362	ipv4_is_zeronet(a) \|\| \
	363	ipv4_is_test_198(a) \|\| \
	364	ipv4_is_anycast_6to4(a))
1da177e4 LT	365
	366	/* Flags used for the bind address copy functions. */
	367	#define SCTP_ADDR6_ALLOWED 0x00000001 /* IPv6 address is allowed by
	368	local sock family */
	369	#define SCTP_ADDR4_PEERSUPP 0x00000002 /* IPv4 address is supported by
	370	peer */
	371	#define SCTP_ADDR6_PEERSUPP 0x00000004 /* IPv6 address is supported by
	372	peer */
	373
	374	/* Reasons to retransmit. */
125c2982	375	enum sctp_retransmit_reason {
1da177e4 LT	376	SCTP_RTXR_T3_RTX,
	377	SCTP_RTXR_FAST_RTX,
	378	SCTP_RTXR_PMTUD,
b6157d8e	379	SCTP_RTXR_T1_RTX,
125c2982	380	};
1da177e4 LT	381
1da177e4 LT	382	/* Reasons to lower cwnd. */
233e7936	383	enum sctp_lower_cwnd {
1da177e4 LT	384	SCTP_LOWER_CWND_T3_RTX,
	385	SCTP_LOWER_CWND_FAST_RTX,
	386	SCTP_LOWER_CWND_ECNE,
	387	SCTP_LOWER_CWND_INACTIVE,
233e7936	388	};
1da177e4	389
1f485649 VY	390
	391	/* SCTP-AUTH Necessary constants */
	392
	393	/* SCTP-AUTH, Section 3.3
	394	*
	395	* The following Table 2 shows the currently defined values for HMAC
	396	* identifiers.
	397	*
	398	* +-----------------+--------------------------+
	399	* \| HMAC Identifier \| Message Digest Algorithm \|
	400	* +-----------------+--------------------------+
	401	* \| 0 \| Reserved \|
	402	* \| 1 \| SHA-1 defined in [8] \|
	403	* \| 2 \| Reserved \|
	404	* \| 3 \| SHA-256 defined in [8] \|
	405	* +-----------------+--------------------------+
	406	*/
	407	enum {
	408	SCTP_AUTH_HMAC_ID_RESERVED_0,
	409	SCTP_AUTH_HMAC_ID_SHA1,
	410	SCTP_AUTH_HMAC_ID_RESERVED_2,
b7e0fe9f VY	411	#if defined (CONFIG_CRYPTO_SHA256) \|\| defined (CONFIG_CRYPTO_SHA256_MODULE)
	412	SCTP_AUTH_HMAC_ID_SHA256,
	413	#endif
	414	__SCTP_AUTH_HMAC_MAX
1f485649 VY	415	};
1f485649 VY	416
b7e0fe9f VY	417	#define SCTP_AUTH_HMAC_ID_MAX __SCTP_AUTH_HMAC_MAX - 1
b7e0fe9f VY	418	#define SCTP_AUTH_NUM_HMACS __SCTP_AUTH_HMAC_MAX
1f485649 VY	419	#define SCTP_SHA1_SIG_SIZE 20
	420	#define SCTP_SHA256_SIG_SIZE 32
	421
	422	/* SCTP-AUTH, Section 3.2
	423	* The chunk types for INIT, INIT-ACK, SHUTDOWN-COMPLETE and AUTH chunks
	424	* MUST NOT be listed in the CHUNKS parameter
	425	*/
	426	#define SCTP_NUM_NOAUTH_CHUNKS 4
	427	#define SCTP_AUTH_MAX_CHUNKS (SCTP_NUM_CHUNK_TYPES - SCTP_NUM_NOAUTH_CHUNKS)
	428
	429	/* SCTP-AUTH Section 6.1
	430	* The RANDOM parameter MUST contain a 32 byte random number.
	431	*/
	432	#define SCTP_AUTH_RANDOM_LENGTH 32
	433
1da177e4	434	#endif /* __sctp_constants_h__ */