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 * 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 */ 36 37 #ifndef NETINET_TCP_H 38 #define NETINET_TCP_H 39 40 #include <stdint.h> 41 42 typedef uint32_t tcp_seq; 43 44 struct tcphdr { 45 uint16_t th_sport; /* src port */ 46 uint16_t th_dport; /* dest. port */ 47 tcp_seq th_seq; /* seq number */ 48 tcp_seq th_ack; /* ack number */ 49 50 #if B_HOST_IS_BENDIAN 51 uint8_t th_off:4, 52 th_x2:4; 53 #else 54 uint8_t th_x2:4, /* unused */ 55 th_off:4; /* data offset */ 56 #endif 57 uint8_t th_flags; /* ACK, FIN, PUSH, RST, SYN, URG */ 58 uint16_t th_win; /* advertised window */ 59 uint16_t th_sum; /* checksum */ 60 uint16_t th_urp; /* urgent offset */ 61 } _PACKED; 62 63 #define TH_FIN 0x01 64 #define TH_SYN 0x02 65 #define TH_RST 0x04 66 #define TH_PUSH 0x08 67 #define TH_ACK 0x10 68 #define TH_URG 0x20 69 70 #define TCPOPT_EOL 0 71 #define TCPOPT_NOP 1 72 #define TCPOPT_MAXSEG 2 73 #define TCPOPT_WINDOW 3 74 #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ 75 #define TCPOPT_SACK 5 /* Experimental */ 76 #define TCPOPT_TIMESTAMP 8 77 #define TCPOPT_SIGNATURE 19 78 79 #define MAX_TCPOPTLEN 40 /* Absolute maximum TCP options len */ 80 81 #define TCPOLEN_MAXSEG 4 82 #define TCPOLEN_WINDOW 3 83 #define TCPOLEN_SACK 8 /* 2*sizeof(tcp_seq) */ 84 #define TCPOLEN_SACK_PERMITTED 2 85 #define TCPOLEN_TIMESTAMP 10 86 #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ 87 #define TCPOLEN_SIGNATURE 18 88 89 #define TCPOPT_TSTAMP_HDR \ 90 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) 91 92 #define TCP_MSS 512 93 #define TCP_MAXWIN 65535 94 #define TCP_MAX_WINSHIFT 14 95 96 97 #endif /* NETINET_TCP_H */ 98