1 /* SPDX-License-Identifier: BSD-3-Clause */ 2 /* 3 * Copyright (c) 1982, 1986, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)tcpip.h 8.1 (Berkeley) 6/10/93 31 * tcpip.h,v 1.3 1994/08/21 05:27:40 paul Exp 32 */ 33 34 #ifndef TCPIP_H 35 #define TCPIP_H 36 37 /* 38 * Tcp+ip header, after ip options removed. 39 */ 40 struct tcpiphdr { 41 struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */ 42 union { 43 struct { 44 struct in_addr ih_src; /* source internet address */ 45 struct in_addr ih_dst; /* destination internet address */ 46 uint8_t ih_x1; /* (unused) */ 47 uint8_t ih_pr; /* protocol */ 48 } ti_i4; 49 struct { 50 struct in6_addr ih_src; 51 struct in6_addr ih_dst; 52 uint8_t ih_x1; 53 uint8_t ih_nh; 54 } ti_i6; 55 } ti; 56 uint16_t ti_x0; 57 uint16_t ti_len; /* protocol length */ 58 struct tcphdr ti_t; /* tcp header */ 59 }; 60 #define ti_mbuf ih_mbuf.mptr 61 #define ti_pr ti.ti_i4.ih_pr 62 #define ti_src ti.ti_i4.ih_src 63 #define ti_dst ti.ti_i4.ih_dst 64 #define ti_src6 ti.ti_i6.ih_src 65 #define ti_dst6 ti.ti_i6.ih_dst 66 #define ti_nh6 ti.ti_i6.ih_nh 67 #define ti_sport ti_t.th_sport 68 #define ti_dport ti_t.th_dport 69 #define ti_seq ti_t.th_seq 70 #define ti_ack ti_t.th_ack 71 #define ti_x2 ti_t.th_x2 72 #define ti_off ti_t.th_off 73 #define ti_flags ti_t.th_flags 74 #define ti_win ti_t.th_win 75 #define ti_sum ti_t.th_sum 76 #define ti_urp ti_t.th_urp 77 78 #define tcpiphdr2qlink(T) \ 79 ((struct qlink *)(((char *)(T)) - sizeof(struct qlink))) 80 #define qlink2tcpiphdr(Q) \ 81 ((struct tcpiphdr *)(((char *)(Q)) + sizeof(struct qlink))) 82 #define tcpiphdr_next(T) qlink2tcpiphdr(tcpiphdr2qlink(T)->next) 83 #define tcpiphdr_prev(T) qlink2tcpiphdr(tcpiphdr2qlink(T)->prev) 84 #define tcpfrag_list_first(T) qlink2tcpiphdr((T)->seg_next) 85 #define tcpfrag_list_end(F, T) (tcpiphdr2qlink(F) == (struct qlink *)(T)) 86 #define tcpfrag_list_empty(T) ((T)->seg_next == (struct tcpiphdr *)(T)) 87 88 /* This is the difference between the size of a tcpiphdr structure, and the 89 * size of actual ip+tcp headers, rounded up since we need to align data. */ 90 #define TCPIPHDR_DELTA \ 91 (MAX(0, (sizeof(struct tcpiphdr) - sizeof(struct ip) - \ 92 sizeof(struct tcphdr) + 3) & \ 93 ~3)) 94 95 /* 96 * Just a clean way to get to the first byte 97 * of the packet 98 */ 99 struct tcpiphdr_2 { 100 struct tcpiphdr dummy; 101 char first_char; 102 }; 103 104 #endif 105