9pfs: fix crash when fsdev is missing
[qemu.git] / slirp / ip_icmp.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 * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93
30 * ip_icmp.h,v 1.4 1995/05/30 08:09:43 rgrimes Exp
31 */
32
33 #ifndef NETINET_IP_ICMP_H
34 #define NETINET_IP_ICMP_H
35
36 /*
37 * Interface Control Message Protocol Definitions.
38 * Per RFC 792, September 1981.
39 */
40
41 typedef uint32_t n_time;
42
43 /*
44 * Structure of an icmp header.
45 */
46 struct icmp {
47 u_char icmp_type; /* type of message, see below */
48 u_char icmp_code; /* type sub code */
49 u_short icmp_cksum; /* ones complement cksum of struct */
50 union {
51 u_char ih_pptr; /* ICMP_PARAMPROB */
52 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
53 struct ih_idseq {
54 u_short icd_id;
55 u_short icd_seq;
56 } ih_idseq;
57 int ih_void;
58
59 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
60 struct ih_pmtu {
61 u_short ipm_void;
62 u_short ipm_nextmtu;
63 } ih_pmtu;
64 } icmp_hun;
65 #define icmp_pptr icmp_hun.ih_pptr
66 #define icmp_gwaddr icmp_hun.ih_gwaddr
67 #define icmp_id icmp_hun.ih_idseq.icd_id
68 #define icmp_seq icmp_hun.ih_idseq.icd_seq
69 #define icmp_void icmp_hun.ih_void
70 #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
71 #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
72 union {
73 struct id_ts {
74 n_time its_otime;
75 n_time its_rtime;
76 n_time its_ttime;
77 } id_ts;
78 struct id_ip {
79 struct ip idi_ip;
80 /* options and then 64 bits of data */
81 } id_ip;
82 uint32_t id_mask;
83 char id_data[1];
84 } icmp_dun;
85 #define icmp_otime icmp_dun.id_ts.its_otime
86 #define icmp_rtime icmp_dun.id_ts.its_rtime
87 #define icmp_ttime icmp_dun.id_ts.its_ttime
88 #define icmp_ip icmp_dun.id_ip.idi_ip
89 #define icmp_mask icmp_dun.id_mask
90 #define icmp_data icmp_dun.id_data
91 };
92
93 /*
94 * Lower bounds on packet lengths for various types.
95 * For the error advice packets must first ensure that the
96 * packet is large enough to contain the returned ip header.
97 * Only then can we do the check to see if 64 bits of packet
98 * data have been returned, since we need to check the returned
99 * ip header length.
100 */
101 #define ICMP_MINLEN 8 /* abs minimum */
102 #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
103 #define ICMP_MASKLEN 12 /* address mask */
104 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
105 #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
106 /* N.B.: must separately check that ip_hl >= 5 */
107
108 /*
109 * Definition of type and code field values.
110 */
111 #define ICMP_ECHOREPLY 0 /* echo reply */
112 #define ICMP_UNREACH 3 /* dest unreachable, codes: */
113 #define ICMP_UNREACH_NET 0 /* bad net */
114 #define ICMP_UNREACH_HOST 1 /* bad host */
115 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
116 #define ICMP_UNREACH_PORT 3 /* bad port */
117 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
118 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
119 #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
120 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
121 #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
122 #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
123 #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
124 #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
125 #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
126 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
127 #define ICMP_REDIRECT 5 /* shorter route, codes: */
128 #define ICMP_REDIRECT_NET 0 /* for network */
129 #define ICMP_REDIRECT_HOST 1 /* for host */
130 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
131 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
132 #define ICMP_ECHO 8 /* echo service */
133 #define ICMP_ROUTERADVERT 9 /* router advertisement */
134 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */
135 #define ICMP_TIMXCEED 11 /* time exceeded, code: */
136 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
137 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
138 #define ICMP_PARAMPROB 12 /* ip header bad */
139 #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
140 #define ICMP_TSTAMP 13 /* timestamp request */
141 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */
142 #define ICMP_IREQ 15 /* information request */
143 #define ICMP_IREQREPLY 16 /* information reply */
144 #define ICMP_MASKREQ 17 /* address mask request */
145 #define ICMP_MASKREPLY 18 /* address mask reply */
146
147 #define ICMP_MAXTYPE 18
148
149 #define ICMP_INFOTYPE(type) \
150 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
151 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
152 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
153 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
154 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
155
156 void icmp_init(Slirp *slirp);
157 void icmp_cleanup(Slirp *slirp);
158 void icmp_input(struct mbuf *, int);
159 void icmp_send_error(struct mbuf *msrc, u_char type, u_char code, int minsize,
160 const char *message);
161 void icmp_reflect(struct mbuf *);
162 void icmp_receive(struct socket *so);
163 void icmp_detach(struct socket *so);
164
165 #endif