9pfs: fix crash when fsdev is missing
[qemu.git] / slirp / tcpip.h
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 */
39 struct 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 */
96 struct tcpiphdr_2 {
97 struct tcpiphdr dummy;
98 char first_char;
99 };
100
101 #endif