constants.h

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/* SCTP kernel reference 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 reference Implementation
 *
 * The SCTP reference 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.
 *
 * The SCTP reference 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 <[e-mail]>
 *
 * Or submit a bug report through the following website:
 *    http://www.sf.net/projects/lksctp
 *
 * Written or modified by:
 *   La Monte H.P. Yarroll <[e-mail]>
 *   Karl Knutson          <[e-mail]>
 *   Randall Stewart       <[e-mail]>
 *   Ken Morneau           <[e-mail]>
 *   Qiaobing Xie          <[e-mail]>
 *   Xingang Guo           <[e-mail]>
 *   Sridhar Samudrala     <[e-mail]>
 *   Daisy Chang           <[e-mail]>
 *
 * 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_CID_MAX			SCTP_CID_ASCONF_ACK

#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;

#define SCTP_EVENT_T_MAX SCTP_EVENT_T_PRIMITIVE
#define SCTP_EVENT_T_NUM (SCTP_EVENT_T_MAX + 1)

/* 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_control(a) (a->chunk_hdr->type != SCTP_CID_DATA)
#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)))

#define SCTP_MAX_ERROR_CAUSE  SCTP_ERROR_NONEXIST_IP
#define SCTP_NUM_ERROR_CAUSE  10

/* 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_EMPTY		= 0,
	SCTP_STATE_CLOSED		= 1,
	SCTP_STATE_COOKIE_WAIT		= 2,
	SCTP_STATE_COOKIE_ECHOED	= 3,
	SCTP_STATE_ESTABLISHED		= 4,
	SCTP_STATE_SHUTDOWN_PENDING	= 5,
	SCTP_STATE_SHUTDOWN_SENT	= 6,
	SCTP_STATE_SHUTDOWN_RECEIVED	= 7,
	SCTP_STATE_SHUTDOWN_ACK_SENT	= 8,

} 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_DISCONNECTING  = TCP_CLOSING,