slirp/src/tcpip.h

   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) ((struct qlink*)(((char*)(T)) - sizeof(struct qlink)))
  79 #define qlink2tcpiphdr(Q) ((struct tcpiphdr*)(((char*)(Q)) + sizeof(struct qlink)))
  80 #define tcpiphdr_next(T) qlink2tcpiphdr(tcpiphdr2qlink(T)->next)
  81 #define tcpiphdr_prev(T) qlink2tcpiphdr(tcpiphdr2qlink(T)->prev)
  82 #define tcpfrag_list_first(T) qlink2tcpiphdr((T)->seg_next)
  83 #define tcpfrag_list_end(F, T) (tcpiphdr2qlink(F) == (struct qlink*)(T))
  84 #define tcpfrag_list_empty(T) ((T)->seg_next == (struct tcpiphdr*)(T))
  85
  86 /* This is the difference between the size of a tcpiphdr structure, and the
  87  * size of actual ip+tcp headers, rounded up since we need to align data.  */
  88 #define TCPIPHDR_DELTA\
  89     (MAX(0,\
  90          (sizeof(struct tcpiphdr)\
  91           - sizeof(struct ip) - sizeof(struct tcphdr) + 3) & ~3))
  92
  93 /*
  94  * Just a clean way to get to the first byte
  95  * of the packet
  96  */
  97 struct tcpiphdr_2 {
  98         struct tcpiphdr dummy;
  99         char first_char;
 100 };
 101
 102 #endif