165 lines
5.8 KiB
C
165 lines
5.8 KiB
C
/*
|
|
* Copyright (c) 1982, 1986, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)tcp.h 8.1 (Berkeley) 6/10/93
|
|
* tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp
|
|
*/
|
|
|
|
#ifndef _TCP_H_
|
|
#define _TCP_H_
|
|
|
|
typedef uint32_t tcp_seq;
|
|
|
|
#define PR_SLOWHZ 2 /* 2 slow timeouts per second (approx) */
|
|
#define PR_FASTHZ 5 /* 5 fast timeouts per second (not important) */
|
|
|
|
#define TCP_SNDSPACE 8192
|
|
#define TCP_RCVSPACE 8192
|
|
|
|
/*
|
|
* TCP header.
|
|
* Per RFC 793, September, 1981.
|
|
*/
|
|
struct tcphdr {
|
|
uint16_t th_sport; /* source port */
|
|
uint16_t th_dport; /* destination port */
|
|
tcp_seq th_seq; /* sequence number */
|
|
tcp_seq th_ack; /* acknowledgement number */
|
|
#ifdef HOST_WORDS_BIGENDIAN
|
|
u_int th_off:4, /* data offset */
|
|
th_x2:4; /* (unused) */
|
|
#else
|
|
u_int th_x2:4, /* (unused) */
|
|
th_off:4; /* data offset */
|
|
#endif
|
|
uint8_t th_flags;
|
|
#define TH_FIN 0x01
|
|
#define TH_SYN 0x02
|
|
#define TH_RST 0x04
|
|
#define TH_PUSH 0x08
|
|
#define TH_ACK 0x10
|
|
#define TH_URG 0x20
|
|
uint16_t th_win; /* window */
|
|
uint16_t th_sum; /* checksum */
|
|
uint16_t th_urp; /* urgent pointer */
|
|
};
|
|
|
|
#include "tcp_var.h"
|
|
|
|
#define TCPOPT_EOL 0
|
|
#define TCPOPT_NOP 1
|
|
#define TCPOPT_MAXSEG 2
|
|
#define TCPOLEN_MAXSEG 4
|
|
#define TCPOPT_WINDOW 3
|
|
#define TCPOLEN_WINDOW 3
|
|
#define TCPOPT_SACK_PERMITTED 4 /* Experimental */
|
|
#define TCPOLEN_SACK_PERMITTED 2
|
|
#define TCPOPT_SACK 5 /* Experimental */
|
|
#define TCPOPT_TIMESTAMP 8
|
|
#define TCPOLEN_TIMESTAMP 10
|
|
#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
|
|
|
|
#define TCPOPT_TSTAMP_HDR \
|
|
(TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
|
|
|
|
/*
|
|
* Default maximum segment size for TCP.
|
|
* With an IP MSS of 576, this is 536,
|
|
* but 512 is probably more convenient.
|
|
* This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
|
|
*
|
|
* We make this 1460 because we only care about Ethernet in the qemu context.
|
|
*/
|
|
#define TCP_MSS 1460
|
|
|
|
#define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
|
|
|
|
#define TCP_MAX_WINSHIFT 14 /* maximum window shift */
|
|
|
|
/*
|
|
* User-settable options (used with setsockopt).
|
|
*
|
|
* We don't use the system headers on unix because we have conflicting
|
|
* local structures. We can't avoid the system definitions on Windows,
|
|
* so we undefine them.
|
|
*/
|
|
#undef TCP_NODELAY
|
|
#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
|
|
#undef TCP_MAXSEG
|
|
|
|
/*
|
|
* TCP FSM state definitions.
|
|
* Per RFC793, September, 1981.
|
|
*/
|
|
|
|
#define TCP_NSTATES 11
|
|
|
|
#define TCPS_CLOSED 0 /* closed */
|
|
#define TCPS_LISTEN 1 /* listening for connection */
|
|
#define TCPS_SYN_SENT 2 /* active, have sent syn */
|
|
#define TCPS_SYN_RECEIVED 3 /* have send and received syn */
|
|
/* states < TCPS_ESTABLISHED are those where connections not established */
|
|
#define TCPS_ESTABLISHED 4 /* established */
|
|
#define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */
|
|
/* states > TCPS_CLOSE_WAIT are those where user has closed */
|
|
#define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */
|
|
#define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */
|
|
#define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */
|
|
/* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
|
|
#define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */
|
|
#define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */
|
|
|
|
#define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
|
|
#define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
|
|
#define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
|
|
|
|
/*
|
|
* TCP sequence numbers are 32 bit integers operated
|
|
* on with modular arithmetic. These macros can be
|
|
* used to compare such integers.
|
|
*/
|
|
#define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
|
|
#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
|
|
#define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
|
|
#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
|
|
|
|
/*
|
|
* Macros to initialize tcp sequence numbers for
|
|
* send and receive from initial send and receive
|
|
* sequence numbers.
|
|
*/
|
|
#define tcp_rcvseqinit(tp) \
|
|
(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
|
|
|
|
#define tcp_sendseqinit(tp) \
|
|
(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss
|
|
|
|
#define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */
|
|
|
|
#endif
|