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 #include "helper.h" 41 42 typedef u_int32_t tcp_seq; 43 44 #define PR_SLOWHZ 2 /* 2 slow timeouts per second (approx) */ 45 #define PR_FASTHZ 5 /* 5 fast timeouts per second (not important) */ 46 47 extern int tcp_rcvspace; 48 extern int tcp_sndspace; 49 extern struct socket *tcp_last_so; 50 51 #define TCP_SNDSPACE 8192 52 #define TCP_RCVSPACE 8192 53 54 /* 55 * TCP header. 56 * Per RFC 793, September, 1981. 57 */ 58 struct tcphdr { 59 port_t th_sport; /* source port */ 60 port_t th_dport; /* destination port */ 61 tcp_seq th_seq; /* sequence number */ 62 tcp_seq th_ack; /* acknowledgement number */ 63 #ifdef WORDS_BIGENDIAN 64 u_int th_off:4, /* data offset */ 65 th_x2:4; /* (unused) */ 66 #else 67 u_int th_x2:4, /* (unused) */ 68 th_off:4; /* data offset */ 69 #endif 70 u_int8_t th_flags; 71 #define TH_FIN 0x01 72 #define TH_SYN 0x02 73 #define TH_RST 0x04 74 #define TH_PUSH 0x08 75 #define TH_ACK 0x10 76 #define TH_URG 0x20 77 u_int16_t th_win; /* window */ 78 u_int16_t th_sum; /* checksum */ 79 u_int16_t th_urp; /* urgent pointer */ 80 }; 81 82 #include "tcp_var.h" 83 84 #define TCPOPT_EOL 0 85 #define TCPOPT_NOP 1 86 #define TCPOPT_MAXSEG 2 87 #define TCPOLEN_MAXSEG 4 88 #define TCPOPT_WINDOW 3 89 #define TCPOLEN_WINDOW 3 90 #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ 91 #define TCPOLEN_SACK_PERMITTED 2 92 #define TCPOPT_SACK 5 /* Experimental */ 93 #define TCPOPT_TIMESTAMP 8 94 #define TCPOLEN_TIMESTAMP 10 95 #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ 96 97 #define TCPOPT_TSTAMP_HDR \ 98 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) 99 100 /* 101 * Default maximum segment size for TCP. 102 * With an IP MSS of 576, this is 536, 103 * but 512 is probably more convenient. 104 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). 105 * 106 * We make this 1460 because we only care about Ethernet in the qemu context. 107 */ 108 #define TCP_MSS 1460 109 110 #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ 111 112 #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ 113 114 /* 115 * User-settable options (used with setsockopt). 116 */ 117 #undef TCP_NODELAY 118 #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ 119 #undef TCP_MAXSEG 120 /* #define TCP_MAXSEG 0x02 */ /* set maximum segment size */ 121 122 /* 123 * TCP FSM state definitions. 124 * Per RFC793, September, 1981. 125 */ 126 127 #define TCP_NSTATES 11 128 129 #define TCPS_CLOSED 0 /* closed */ 130 #define TCPS_LISTEN 1 /* listening for connection */ 131 #define TCPS_SYN_SENT 2 /* active, have sent syn */ 132 #define TCPS_SYN_RECEIVED 3 /* have send and received syn */ 133 /* states < TCPS_ESTABLISHED are those where connections not established */ 134 #define TCPS_ESTABLISHED 4 /* established */ 135 #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */ 136 /* states > TCPS_CLOSE_WAIT are those where user has closed */ 137 #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */ 138 #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */ 139 #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */ 140 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */ 141 #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */ 142 #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */ 143 144 #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED) 145 #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED) 146 #define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT) 147 148 /* 149 * TCP sequence numbers are 32 bit integers operated 150 * on with modular arithmetic. These macros can be 151 * used to compare such integers. 152 */ 153 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) 154 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 155 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) 156 #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) 157 158 /* 159 * Macros to initialize tcp sequence numbers for 160 * send and receive from initial send and receive 161 * sequence numbers. 162 */ 163 #define tcp_rcvseqinit(tp) \ 164 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 165 166 #define tcp_sendseqinit(tp) \ 167 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss 168 169 #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ 170 171 extern tcp_seq tcp_iss; /* tcp initial send seq # */ 172 173 extern char *tcpstates[]; 174 175 #endif 176