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