| 1 |
gbeauche |
1.1 |
/* |
| 2 |
|
|
* Copyright (c) 1982, 1986, 1993 |
| 3 |
|
|
* The Regents of the University of California. All rights reserved. |
| 4 |
|
|
* |
| 5 |
|
|
* Redistribution and use in source and binary forms, with or without |
| 6 |
|
|
* modification, are permitted provided that the following conditions |
| 7 |
|
|
* are met: |
| 8 |
|
|
* 1. Redistributions of source code must retain the above copyright |
| 9 |
|
|
* notice, this list of conditions and the following disclaimer. |
| 10 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright |
| 11 |
|
|
* notice, this list of conditions and the following disclaimer in the |
| 12 |
|
|
* documentation and/or other materials provided with the distribution. |
| 13 |
|
|
* 3. All advertising materials mentioning features or use of this software |
| 14 |
|
|
* must display the following acknowledgement: |
| 15 |
|
|
* This product includes software developed by the University of |
| 16 |
|
|
* California, Berkeley and its contributors. |
| 17 |
|
|
* 4. Neither the name of the University nor the names of its contributors |
| 18 |
|
|
* may be used to endorse or promote products derived from this software |
| 19 |
|
|
* without specific prior written permission. |
| 20 |
|
|
* |
| 21 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 |
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 |
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 |
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 |
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 |
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 |
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 |
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 |
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 |
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 |
|
|
* SUCH DAMAGE. |
| 32 |
|
|
* |
| 33 |
|
|
* @(#)tcp.h 8.1 (Berkeley) 6/10/93 |
| 34 |
|
|
* tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp |
| 35 |
|
|
*/ |
| 36 |
|
|
|
| 37 |
|
|
#ifndef _TCP_H_ |
| 38 |
|
|
#define _TCP_H_ |
| 39 |
|
|
|
| 40 |
|
|
typedef u_int32_t tcp_seq; |
| 41 |
|
|
|
| 42 |
|
|
#define PR_SLOWHZ 2 /* 2 slow timeouts per second (approx) */ |
| 43 |
|
|
#define PR_FASTHZ 5 /* 5 fast timeouts per second (not important) */ |
| 44 |
|
|
|
| 45 |
|
|
extern int tcp_rcvspace; |
| 46 |
|
|
extern int tcp_sndspace; |
| 47 |
|
|
extern struct socket *tcp_last_so; |
| 48 |
|
|
|
| 49 |
|
|
#define TCP_SNDSPACE 8192 |
| 50 |
|
|
#define TCP_RCVSPACE 8192 |
| 51 |
|
|
|
| 52 |
|
|
/* |
| 53 |
|
|
* TCP header. |
| 54 |
|
|
* Per RFC 793, September, 1981. |
| 55 |
|
|
*/ |
| 56 |
|
|
struct tcphdr { |
| 57 |
|
|
u_int16_t th_sport; /* source port */ |
| 58 |
|
|
u_int16_t th_dport; /* destination port */ |
| 59 |
|
|
tcp_seq th_seq; /* sequence number */ |
| 60 |
|
|
tcp_seq th_ack; /* acknowledgement number */ |
| 61 |
|
|
#ifdef WORDS_BIGENDIAN |
| 62 |
|
|
u_int th_off:4, /* data offset */ |
| 63 |
|
|
th_x2:4; /* (unused) */ |
| 64 |
|
|
#else |
| 65 |
|
|
u_int th_x2:4, /* (unused) */ |
| 66 |
|
|
th_off:4; /* data offset */ |
| 67 |
|
|
#endif |
| 68 |
|
|
u_int8_t th_flags; |
| 69 |
|
|
#define TH_FIN 0x01 |
| 70 |
|
|
#define TH_SYN 0x02 |
| 71 |
|
|
#define TH_RST 0x04 |
| 72 |
|
|
#define TH_PUSH 0x08 |
| 73 |
|
|
#define TH_ACK 0x10 |
| 74 |
|
|
#define TH_URG 0x20 |
| 75 |
|
|
u_int16_t th_win; /* window */ |
| 76 |
|
|
u_int16_t th_sum; /* checksum */ |
| 77 |
|
|
u_int16_t th_urp; /* urgent pointer */ |
| 78 |
|
|
}; |
| 79 |
|
|
|
| 80 |
|
|
#include "tcp_var.h" |
| 81 |
|
|
|
| 82 |
|
|
#define TCPOPT_EOL 0 |
| 83 |
|
|
#define TCPOPT_NOP 1 |
| 84 |
|
|
#define TCPOPT_MAXSEG 2 |
| 85 |
|
|
#define TCPOLEN_MAXSEG 4 |
| 86 |
|
|
#define TCPOPT_WINDOW 3 |
| 87 |
|
|
#define TCPOLEN_WINDOW 3 |
| 88 |
|
|
#define TCPOPT_SACK_PERMITTED 4 /* Experimental */ |
| 89 |
|
|
#define TCPOLEN_SACK_PERMITTED 2 |
| 90 |
|
|
#define TCPOPT_SACK 5 /* Experimental */ |
| 91 |
|
|
#define TCPOPT_TIMESTAMP 8 |
| 92 |
|
|
#define TCPOLEN_TIMESTAMP 10 |
| 93 |
|
|
#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ |
| 94 |
|
|
|
| 95 |
|
|
#define TCPOPT_TSTAMP_HDR \ |
| 96 |
|
|
(TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) |
| 97 |
|
|
|
| 98 |
|
|
/* |
| 99 |
|
|
* Default maximum segment size for TCP. |
| 100 |
|
|
* With an IP MSS of 576, this is 536, |
| 101 |
|
|
* but 512 is probably more convenient. |
| 102 |
|
|
* This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). |
| 103 |
|
|
*/ |
| 104 |
|
|
#define TCP_MSS 512 |
| 105 |
|
|
|
| 106 |
|
|
#define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ |
| 107 |
|
|
|
| 108 |
|
|
#define TCP_MAX_WINSHIFT 14 /* maximum window shift */ |
| 109 |
|
|
|
| 110 |
|
|
/* |
| 111 |
|
|
* User-settable options (used with setsockopt). |
| 112 |
|
|
*/ |
| 113 |
|
|
/* #define TCP_NODELAY 0x01 */ /* don't delay send to coalesce packets */ |
| 114 |
|
|
/* #define TCP_MAXSEG 0x02 */ /* set maximum segment size */ |
| 115 |
|
|
|
| 116 |
|
|
/* |
| 117 |
|
|
* TCP FSM state definitions. |
| 118 |
|
|
* Per RFC793, September, 1981. |
| 119 |
|
|
*/ |
| 120 |
|
|
|
| 121 |
|
|
#define TCP_NSTATES 11 |
| 122 |
|
|
|
| 123 |
|
|
#define TCPS_CLOSED 0 /* closed */ |
| 124 |
|
|
#define TCPS_LISTEN 1 /* listening for connection */ |
| 125 |
|
|
#define TCPS_SYN_SENT 2 /* active, have sent syn */ |
| 126 |
|
|
#define TCPS_SYN_RECEIVED 3 /* have send and received syn */ |
| 127 |
|
|
/* states < TCPS_ESTABLISHED are those where connections not established */ |
| 128 |
|
|
#define TCPS_ESTABLISHED 4 /* established */ |
| 129 |
|
|
#define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */ |
| 130 |
|
|
/* states > TCPS_CLOSE_WAIT are those where user has closed */ |
| 131 |
|
|
#define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */ |
| 132 |
|
|
#define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */ |
| 133 |
|
|
#define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */ |
| 134 |
|
|
/* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */ |
| 135 |
|
|
#define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */ |
| 136 |
|
|
#define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */ |
| 137 |
|
|
|
| 138 |
|
|
#define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED) |
| 139 |
|
|
#define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED) |
| 140 |
|
|
#define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT) |
| 141 |
|
|
|
| 142 |
|
|
/* |
| 143 |
|
|
* TCP sequence numbers are 32 bit integers operated |
| 144 |
|
|
* on with modular arithmetic. These macros can be |
| 145 |
|
|
* used to compare such integers. |
| 146 |
|
|
*/ |
| 147 |
|
|
#define SEQ_LT(a,b) ((int)((a)-(b)) < 0) |
| 148 |
|
|
#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) |
| 149 |
|
|
#define SEQ_GT(a,b) ((int)((a)-(b)) > 0) |
| 150 |
|
|
#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) |
| 151 |
|
|
|
| 152 |
|
|
/* |
| 153 |
|
|
* Macros to initialize tcp sequence numbers for |
| 154 |
|
|
* send and receive from initial send and receive |
| 155 |
|
|
* sequence numbers. |
| 156 |
|
|
*/ |
| 157 |
|
|
#define tcp_rcvseqinit(tp) \ |
| 158 |
|
|
(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 |
| 159 |
|
|
|
| 160 |
|
|
#define tcp_sendseqinit(tp) \ |
| 161 |
|
|
(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss |
| 162 |
|
|
|
| 163 |
|
|
#define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ |
| 164 |
|
|
|
| 165 |
|
|
extern tcp_seq tcp_iss; /* tcp initial send seq # */ |
| 166 |
|
|
|
| 167 |
|
|
extern char *tcpstates[]; |
| 168 |
|
|
|
| 169 |
|
|
#endif |
