The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 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 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 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 | port_t th_sport; /* source port */ |
| 58 | port_t th_dport; /* destination port */ |
| 59 | tcp_seq th_seq; /* sequence number */ |
| 60 | tcp_seq th_ack; /* acknowledgement number */ |
David 'Digit' Turner | 20894ae | 2010-05-10 17:07:36 -0700 | [diff] [blame] | 61 | #ifdef HOST_WORDS_BIGENDIAN |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 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 | * We make this 1460 because we only care about Ethernet in the qemu context. |
| 105 | */ |
| 106 | #define TCP_MSS 1460 |
| 107 | |
| 108 | #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ |
| 109 | |
| 110 | #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ |
| 111 | |
| 112 | /* |
| 113 | * User-settable options (used with setsockopt). |
| 114 | */ |
David 'Digit' Turner | c005246 | 2014-02-25 18:39:29 +0100 | [diff] [blame] | 115 | #undef TCP_NODELAY |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 116 | #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ |
| 117 | #undef TCP_MAXSEG |
| 118 | /* #define TCP_MAXSEG 0x02 */ /* set maximum segment size */ |
| 119 | |
| 120 | /* |
| 121 | * TCP FSM state definitions. |
| 122 | * Per RFC793, September, 1981. |
| 123 | */ |
| 124 | |
| 125 | #define TCP_NSTATES 11 |
| 126 | |
| 127 | #define TCPS_CLOSED 0 /* closed */ |
| 128 | #define TCPS_LISTEN 1 /* listening for connection */ |
| 129 | #define TCPS_SYN_SENT 2 /* active, have sent syn */ |
| 130 | #define TCPS_SYN_RECEIVED 3 /* have send and received syn */ |
| 131 | /* states < TCPS_ESTABLISHED are those where connections not established */ |
| 132 | #define TCPS_ESTABLISHED 4 /* established */ |
| 133 | #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */ |
| 134 | /* states > TCPS_CLOSE_WAIT are those where user has closed */ |
| 135 | #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */ |
| 136 | #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */ |
| 137 | #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */ |
| 138 | /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */ |
| 139 | #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */ |
| 140 | #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */ |
| 141 | |
| 142 | #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED) |
| 143 | #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED) |
| 144 | #define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT) |
| 145 | |
| 146 | /* |
| 147 | * TCP sequence numbers are 32 bit integers operated |
| 148 | * on with modular arithmetic. These macros can be |
| 149 | * used to compare such integers. |
| 150 | */ |
| 151 | #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) |
| 152 | #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) |
| 153 | #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) |
| 154 | #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) |
| 155 | |
| 156 | /* |
| 157 | * Macros to initialize tcp sequence numbers for |
| 158 | * send and receive from initial send and receive |
| 159 | * sequence numbers. |
| 160 | */ |
| 161 | #define tcp_rcvseqinit(tp) \ |
| 162 | (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 |
| 163 | |
| 164 | #define tcp_sendseqinit(tp) \ |
| 165 | (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss |
| 166 | |
| 167 | #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ |
| 168 | |
| 169 | extern tcp_seq tcp_iss; /* tcp initial send seq # */ |
| 170 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 171 | extern const char * const tcpstates[]; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 172 | |
| 173 | #endif |