00001 /* 00002 * Copyright (c) 1982, 1986, 1993 00003 * The Regents of the University of California. All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions 00007 * are met: 00008 * 1. Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * 3. Neither the name of the University nor the names of its contributors 00014 * may be used to endorse or promote products derived from this software 00015 * without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 00018 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00019 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00020 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 00021 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00022 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00023 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00024 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00025 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00026 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00027 * SUCH DAMAGE. 00028 * 00029 * @(#)tcp.h 8.1 (Berkeley) 6/10/93 00030 * tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp 00031 */ 00032 00033 #ifndef _TCP_H_ 00034 #define _TCP_H_ 00035 00036 typedef u_int32_t tcp_seq; 00037 00038 #define PR_SLOWHZ 2 /* 2 slow timeouts per second (approx) */ 00039 #define PR_FASTHZ 5 /* 5 fast timeouts per second (not important) */ 00040 00041 extern struct socket *tcp_last_so; 00042 00043 #define TCP_SNDSPACE 8192 00044 #define TCP_RCVSPACE 8192 00045 00046 /* 00047 * TCP header. 00048 * Per RFC 793, September, 1981. 00049 */ 00050 struct tcphdr { 00051 u_int16_t th_sport; /* source port */ 00052 u_int16_t th_dport; /* destination port */ 00053 tcp_seq th_seq; /* sequence number */ 00054 tcp_seq th_ack; /* acknowledgement number */ 00055 #ifdef WORDS_BIGENDIAN 00056 u_int th_off:4, /* data offset */ 00057 th_x2:4; /* (unused) */ 00058 #else 00059 u_int th_x2:4, /* (unused) */ 00060 th_off:4; /* data offset */ 00061 #endif 00062 u_int8_t th_flags; 00063 #define TH_FIN 0x01 00064 #define TH_SYN 0x02 00065 #define TH_RST 0x04 00066 #define TH_PUSH 0x08 00067 #define TH_ACK 0x10 00068 #define TH_URG 0x20 00069 u_int16_t th_win; /* window */ 00070 u_int16_t th_sum; /* checksum */ 00071 u_int16_t th_urp; /* urgent pointer */ 00072 }; 00073 00074 #include "tcp_var.h" 00075 00076 #define TCPOPT_EOL 0 00077 #define TCPOPT_NOP 1 00078 #define TCPOPT_MAXSEG 2 00079 #define TCPOLEN_MAXSEG 4 00080 #define TCPOPT_WINDOW 3 00081 #define TCPOLEN_WINDOW 3 00082 #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ 00083 #define TCPOLEN_SACK_PERMITTED 2 00084 #define TCPOPT_SACK 5 /* Experimental */ 00085 #define TCPOPT_TIMESTAMP 8 00086 #define TCPOLEN_TIMESTAMP 10 00087 #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ 00088 00089 #define TCPOPT_TSTAMP_HDR \ 00090 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) 00091 00092 /* 00093 * Default maximum segment size for TCP. 00094 * With an IP MSS of 576, this is 536, 00095 * but 512 is probably more convenient. 00096 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). 00097 * 00098 * We make this 1460 because we only care about Ethernet in the qemu context. 00099 */ 00100 #define TCP_MSS 1460 00101 00102 #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ 00103 00104 #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ 00105 00106 /* 00107 * User-settable options (used with setsockopt). 00108 * 00109 * We don't use the system headers on unix because we have conflicting 00110 * local structures. We can't avoid the system definitions on Windows, 00111 * so we undefine them. 00112 */ 00113 #undef TCP_NODELAY 00114 #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ 00115 #undef TCP_MAXSEG 00116 /* #define TCP_MAXSEG 0x02 */ /* set maximum segment size */ 00117 00118 /* 00119 * TCP FSM state definitions. 00120 * Per RFC793, September, 1981. 00121 */ 00122 00123 #define TCP_NSTATES 11 00124 00125 #define TCPS_CLOSED 0 /* closed */ 00126 #define TCPS_LISTEN 1 /* listening for connection */ 00127 #define TCPS_SYN_SENT 2 /* active, have sent syn */ 00128 #define TCPS_SYN_RECEIVED 3 /* have send and received syn */ 00129 /* states < TCPS_ESTABLISHED are those where connections not established */ 00130 #define TCPS_ESTABLISHED 4 /* established */ 00131 #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */ 00132 /* states > TCPS_CLOSE_WAIT are those where user has closed */ 00133 #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */ 00134 #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */ 00135 #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */ 00136 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */ 00137 #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */ 00138 #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */ 00139 00140 #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED) 00141 #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED) 00142 #define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT) 00143 00144 /* 00145 * TCP sequence numbers are 32 bit integers operated 00146 * on with modular arithmetic. These macros can be 00147 * used to compare such integers. 00148 */ 00149 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) 00150 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 00151 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) 00152 #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) 00153 00154 /* 00155 * Macros to initialize tcp sequence numbers for 00156 * send and receive from initial send and receive 00157 * sequence numbers. 00158 */ 00159 #define tcp_rcvseqinit(tp) \ 00160 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 00161 00162 #define tcp_sendseqinit(tp) \ 00163 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss 00164 00165 #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ 00166 00167 extern tcp_seq tcp_iss; /* tcp initial send seq # */ 00168 00169 extern const char * const tcpstates[]; 00170 00171 #endif