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	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1982, 1986, 1993
	24	* The Regents of the University of California. All rights reserved.
	25	*
	26	* Redistribution and use in source and binary forms, with or without
	27	* modification, are permitted provided that the following conditions
	28	* are met:
	29	* 1. Redistributions of source code must retain the above copyright
	30	* notice, this list of conditions and the following disclaimer.
	31	* 2. Redistributions in binary form must reproduce the above copyright
	32	* notice, this list of conditions and the following disclaimer in the
	33	* documentation and/or other materials provided with the distribution.
	34	* 3. All advertising materials mentioning features or use of this software
	35	* must display the following acknowledgement:
	36	* This product includes software developed by the University of
	37	* California, Berkeley and its contributors.
	38	* 4. Neither the name of the University nor the names of its contributors
	39	* may be used to endorse or promote products derived from this software
	40	* without specific prior written permission.
	41	*
	42	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	43	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	44	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	45	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	46	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	47	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	48	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	49	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	50	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	51	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	52	* SUCH DAMAGE.
	53	*
	54	* @(#)tcp_fsm.h 8.1 (Berkeley) 6/10/93
	55	*/
	56
	57	#ifndef _NETINET_TCP_FSM_H_
	58	#define _NETINET_TCP_FSM_H_
	59
	60	/*
	61	* TCP FSM state definitions.
	62	* Per RFC793, September, 1981.
	63	*/
	64
	65	#define TCP_NSTATES 11
	66
	67	#define TCPS_CLOSED 0 /* closed */
	68	#define TCPS_LISTEN 1 /* listening for connection */
	69	#define TCPS_SYN_SENT 2 /* active, have sent syn */
	70	#define TCPS_SYN_RECEIVED 3 /* have send and received syn */
	71	/* states < TCPS_ESTABLISHED are those where connections not established */
	72	#define TCPS_ESTABLISHED 4 /* established */
	73	#define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */
	74	/* states > TCPS_CLOSE_WAIT are those where user has closed */
	75	#define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */
	76	#define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */
	77	#define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */
	78	/* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
	79	#define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */
	80	#define TCPS_TIME_WAIT 10 /* in 2msl quiet wait after close /
	81
	82	/* for KAME src sync over BSD's /
	83	#define TCP6_NSTATES TCP_NSTATES
	84	#define TCP6S_CLOSED TCPS_CLOSED
	85	#define TCP6S_LISTEN TCPS_LISTEN
	86	#define TCP6S_SYN_SENT TCPS_SYN_SENT
	87	#define TCP6S_SYN_RECEIVED TCPS_SYN_RECEIVED
	88	#define TCP6S_ESTABLISHED TCPS_ESTABLISHED
	89	#define TCP6S_CLOSE_WAIT TCPS_CLOSE_WAIT
	90	#define TCP6S_FIN_WAIT_1 TCPS_FIN_WAIT_1
	91	#define TCP6S_CLOSING TCPS_CLOSING
	92	#define TCP6S_LAST_ACK TCPS_LAST_ACK
	93	#define TCP6S_FIN_WAIT_2 TCPS_FIN_WAIT_2
	94	#define TCP6S_TIME_WAIT TCPS_TIME_WAIT
	95
	96	#define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
	97	#define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
	98	#define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
	99
	100	#ifdef TCPOUTFLAGS
	101	/*
	102	* Flags used when sending segments in tcp_output.
	103	* Basic flags (TH_RST,TH_ACK,TH_SYN,TH_FIN) are totally
	104	* determined by state, with the proviso that TH_FIN is sent only
	105	* if all data queued for output is included in the segment.
	106	*/
	107	static u_char tcp_outflags[TCP_NSTATES] = {
	108	TH_RST\|TH_ACK, 0, TH_SYN, TH_SYN\|TH_ACK,
	109	TH_ACK, TH_ACK,
	110	TH_FIN\|TH_ACK, TH_ACK, TH_FIN\|TH_ACK, TH_ACK, TH_ACK,
	111	};
	112	#endif
	113
	114	#if KPROF
	115	int tcp_acounts[TCP_NSTATES][PRU_NREQ];
	116	#endif
	117
	118	#ifdef TCPSTATES
	119	char *tcpstates[] = {
	120	"CLOSED", "LISTEN", "SYN_SENT", "SYN_RCVD",
	121	"ESTABLISHED", "CLOSE_WAIT", "FIN_WAIT_1", "CLOSING",
	122	"LAST_ACK", "FIN_WAIT_2", "TIME_WAIT",
	123	};
	124	#endif
	125
	126	#endif