1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Definitions for the TCP protocol. 7 * 8 * Version: @(#)tcp.h 1.0.2 04/28/93 9 * 10 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 */ 17 18 #pragma once 19 20 #include "linux.h" 21 22 struct tcphdr { 23 __u16 source; 24 __u16 dest; 25 __u32 seq; 26 __u32 ack_seq; 27 //#if defined(__LITTLE_ENDIAN_BITFIELD) 28 __u16 res1:4, 29 doff:4, 30 fin:1, 31 syn:1, 32 rst:1, 33 psh:1, 34 ack:1, 35 urg:1, 36 ece:1, 37 cwr:1; 38 /*#elif defined(__BIG_ENDIAN_BITFIELD) 39 __u16 doff:4, 40 res1:4, 41 cwr:1, 42 ece:1, 43 urg:1, 44 ack:1, 45 psh:1, 46 rst:1, 47 syn:1, 48 fin:1; 49 #else 50 #error "Adjust your <asm/byteorder.h> defines" 51 #endif */ 52 __u16 window; 53 __u16 check; 54 __u16 urg_ptr; 55 }; 56 57 58 enum { 59 TCP_ESTABLISHED = 1, 60 TCP_SYN_SENT, 61 TCP_SYN_RECV, 62 TCP_FIN_WAIT1, 63 TCP_FIN_WAIT2, 64 TCP_TIME_WAIT, 65 TCP_CLOSE, 66 TCP_CLOSE_WAIT, 67 TCP_LAST_ACK, 68 TCP_LISTEN, 69 TCP_CLOSING, /* now a valid state */ 70 71 TCP_MAX_STATES /* Leave at the end! */ 72 }; 73 74 #define TCP_STATE_MASK 0xF 75 #define TCP_ACTION_FIN (1 << 7) 76 77 enum { 78 TCPF_ESTABLISHED = (1 << 1), 79 TCPF_SYN_SENT = (1 << 2), 80 TCPF_SYN_RECV = (1 << 3), 81 TCPF_FIN_WAIT1 = (1 << 4), 82 TCPF_FIN_WAIT2 = (1 << 5), 83 TCPF_TIME_WAIT = (1 << 6), 84 TCPF_CLOSE = (1 << 7), 85 TCPF_CLOSE_WAIT = (1 << 8), 86 TCPF_LAST_ACK = (1 << 9), 87 TCPF_LISTEN = (1 << 10), 88 TCPF_CLOSING = (1 << 11) 89 }; 90 91 /* 92 * The union cast uses a gcc extension to avoid aliasing problems 93 * (union is compatible to any of its members) 94 * This means this part of the code is -fstrict-aliasing safe now. 95 */ 96 union tcp_word_hdr { 97 struct tcphdr hdr; 98 __u32 words[5]; 99 }; 100 101 #define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) 102 103 enum { 104 TCP_FLAG_CWR = 0x00800000, // __constant_htonl(0x00800000), 105 TCP_FLAG_ECE = 0x00400000, //__constant_htonl(0x00400000), 106 TCP_FLAG_URG = 0x00200000, //__constant_htonl(0x00200000), 107 TCP_FLAG_ACK = 0x00100000, //__constant_htonl(0x00100000), 108 TCP_FLAG_PSH = 0x00080000, //__constant_htonl(0x00080000), 109 TCP_FLAG_RST = 0x00040000, //__constant_htonl(0x00040000), 110 TCP_FLAG_SYN = 0x00020000, //__constant_htonl(0x00020000), 111 TCP_FLAG_FIN = 0x00010000, //__constant_htonl(0x00010000), 112 TCP_RESERVED_BITS = 0x0F000000, //__constant_htonl(0x0F000000), 113 TCP_DATA_OFFSET = 0xF0000000, //__constant_htonl(0xF0000000) 114 }; 115 116 /* TCP socket options */ 117 #define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */ 118 #define TCP_MAXSEG 2 /* Limit MSS */ 119 #define TCP_CORK 3 /* Never send partially complete segments */ 120 #define TCP_KEEPIDLE 4 /* Start keepalives after this period */ 121 #define TCP_KEEPINTVL 5 /* Interval between keepalives */ 122 #define TCP_KEEPCNT 6 /* Number of keepalives before death */ 123 #define TCP_SYNCNT 7 /* Number of SYN retransmits */ 124 #define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */ 125 #define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */ 126 #define TCP_WINDOW_CLAMP 10 /* Bound advertised window */ 127 #define TCP_INFO 11 /* Information about this connection. */ 128 #define TCP_QUICKACK 12 /* Block/reenable quick acks */ 129 130 #define TCPI_OPT_TIMESTAMPS 1 131 #define TCPI_OPT_SACK 2 132 #define TCPI_OPT_WSCALE 4 133 #define TCPI_OPT_ECN 8 134 135 enum tcp_ca_state 136 { 137 TCP_CA_Open = 0, 138 #define TCPF_CA_Open (1<<TCP_CA_Open) 139 TCP_CA_Disorder = 1, 140 #define TCPF_CA_Disorder (1<<TCP_CA_Disorder) 141 TCP_CA_CWR = 2, 142 #define TCPF_CA_CWR (1<<TCP_CA_CWR) 143 TCP_CA_Recovery = 3, 144 #define TCPF_CA_Recovery (1<<TCP_CA_Recovery) 145 TCP_CA_Loss = 4 146 #define TCPF_CA_Loss (1<<TCP_CA_Loss) 147 }; 148 149 struct tcp_info 150 { 151 __u8 tcpi_state; 152 __u8 tcpi_ca_state; 153 __u8 tcpi_retransmits; 154 __u8 tcpi_probes; 155 __u8 tcpi_backoff; 156 __u8 tcpi_options; 157 __u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4; 158 159 __u32 tcpi_rto; 160 __u32 tcpi_ato; 161 __u32 tcpi_snd_mss; 162 __u32 tcpi_rcv_mss; 163 164 __u32 tcpi_unacked; 165 __u32 tcpi_sacked; 166 __u32 tcpi_lost; 167 __u32 tcpi_retrans; 168 __u32 tcpi_fackets; 169 170 /* Times. */ 171 __u32 tcpi_last_data_sent; 172 __u32 tcpi_last_ack_sent; /* Not remembered, sorry. */ 173 __u32 tcpi_last_data_recv; 174 __u32 tcpi_last_ack_recv; 175 176 /* Metrics. */ 177 __u32 tcpi_pmtu; 178 __u32 tcpi_rcv_ssthresh; 179 __u32 tcpi_rtt; 180 __u32 tcpi_rttvar; 181 __u32 tcpi_snd_ssthresh; 182 __u32 tcpi_snd_cwnd; 183 __u32 tcpi_advmss; 184 __u32 tcpi_reordering; 185 }; 186