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 typedef uint32 tcp_seq; 41 42 struct tcphdr { 43 uint16 th_sport; /* src port */ 44 uint16 th_dport; /* dest. port */ 45 tcp_seq th_seq; /* seq number */ 46 tcp_seq th_ack; /* ack number */ 47 48 #if B_HOST_IS_BENDIAN 49 uint8 th_off:4, 50 th_x2:4; 51 #else 52 uint8 th_x2:4, /* unused */ 53 th_off:4; /* data offset */ 54 #endif 55 uint8 th_flags; /* ACK, FIN, PUSH, RST, SYN, URG */ 56 uint16 th_win; /* advertised window */ 57 uint16 th_sum; /* checksum */ 58 uint16 th_urp; /* urgent offset */ 59 } _PACKED; 60 61 #define TH_FIN 0x01 62 #define TH_SYN 0x02 63 #define TH_RST 0x04 64 #define TH_PUSH 0x08 65 #define TH_ACK 0x10 66 #define TH_URG 0x20 67 68 #define TCPOPT_EOL 0 69 #define TCPOPT_NOP 1 70 #define TCPOPT_MAXSEG 2 71 #define TCPOPT_WINDOW 3 72 #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ 73 #define TCPOPT_SACK 5 /* Experimental */ 74 #define TCPOPT_TIMESTAMP 8 75 #define TCPOPT_SIGNATURE 19 76 77 #define MAX_TCPOPTLEN 40 /* Absolute maximum TCP options len */ 78 79 #define TCPOLEN_MAXSEG 4 80 #define TCPOLEN_WINDOW 3 81 #define TCPOLEN_SACK 8 /* 2*sizeof(tcp_seq) */ 82 #define TCPOLEN_SACK_PERMITTED 2 83 #define TCPOLEN_TIMESTAMP 10 84 #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ 85 #define TCPOLEN_SIGNATURE 18 86 87 #define TCPOPT_TSTAMP_HDR \ 88 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) 89 90 #define TCP_MSS 512 91 #define TCP_MAXWIN 65535 92 #define TCP_MAX_WINSHIFT 14 93 94 95 #endif /* NETINET_TCP_H */ 96