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icmp.h
1/* -*- c-basic-offset: 4 -*- */
2#ifndef CLICKNET_ICMP_H
3#define CLICKNET_ICMP_H
4#include <clicknet/ip.h>
5
6/*
7 * <clicknet/icmp.h> -- ICMP packet definitions, based on FreeBSD.
8 *
9 * Relevant RFCs include:
10 * RFC792 Internet Control Message Protocol
11 * RFC1122 Requirements for Internet Hosts - Communication Layers
12 * RFC1123 Requirements for Internet Hosts - Application and Support
13 * RFC1812 Requirements for IP Version 4 Routers
14 */
15
16/* most icmp request types: ICMP_UNREACH, ICMP_SOURCEQUENCH, ICMP_TIMXCEED */
17struct click_icmp {
18 uint8_t icmp_type; /* 0 ICMP type (see below) */
19 uint8_t icmp_code; /* 1 ICMP code (see below) */
20 uint16_t icmp_cksum; /* 2-3 checksum */
21 uint32_t padding; /* 4-7 should be zero */
22 /* followed by original IP header and initial portion of data */
23};
24
25/* header for types with sequence numbers: ICMP_ECHO, ICMP_ECHOREPLY,
26 ICMP_IREQ, ICMP_IREQREPLY */
27struct click_icmp_sequenced {
28 uint8_t icmp_type; /* 0 ICMP type (see below) */
29 uint8_t icmp_code; /* 1 ICMP code (see below) */
30 uint16_t icmp_cksum; /* 2-3 checksum */
31 uint16_t icmp_identifier; /* 4-5 flow identifier */
32 uint16_t icmp_sequence; /* 6-7 sequence number in flow */
33};
34
35/* ICMP_PARAMPROB header */
36struct click_icmp_paramprob {
37 uint8_t icmp_type; /* 0 ICMP type (see below) */
38 uint8_t icmp_code; /* 1 ICMP code (see below) */
39 uint16_t icmp_cksum; /* 2-3 checksum */
40 uint8_t icmp_pointer; /* 4 parameter pointer */
41 uint8_t padding[3]; /* 5-7 should be zero */
42 /* followed by original IP header and initial portion of data */
43};
44
45/* Redirect header: ICMP_REDIRECT */
46struct click_icmp_redirect {
47 uint8_t icmp_type; /* 0 ICMP_REDIRECT (see below) */
48 uint8_t icmp_code; /* 1 ICMP code (see below) */
49 uint16_t icmp_cksum; /* 2-3 checksum */
50 struct in_addr icmp_gateway; /* 4-7 address of gateway */
51 /* followed by original IP header and initial portion of data */
52};
53
54/* Timestamp and TimestampReply header: ICMP_TSTAMP and ICMP_TSTAMPREPLY */
55struct click_icmp_tstamp {
56 uint8_t icmp_type; /* 0 ICMP type (see below) */
57 uint8_t icmp_code; /* 1 ICMP code (see below) */
58 uint16_t icmp_cksum; /* 2-3 checksum */
59 uint16_t icmp_identifier; /* 4-5 flow identifier */
60 uint16_t icmp_sequence; /* 6-7 sequence number in flow */
61 uint32_t icmp_originate; /* 8-11 originate timestamp */
62 uint32_t icmp_receive; /* 12-15 receive timestamp */
63 uint32_t icmp_transmit; /* 16-19 transmit timestamp */
64};
65
66/* Path MTU Discovery header: ICMP_UNREACH_NEEDFRAG */
67struct click_icmp_needfrag {
68 uint8_t icmp_type; /* 0 ICMP_UNREACH (see below) */
69 uint8_t icmp_code; /* 1 ICMP_UNREACH_NEEDFRAG */
70 uint16_t icmp_cksum; /* 2-3 checksum */
71 uint16_t padding; /* 4-5 should be zero */
72 uint16_t icmp_nextmtu; /* 6-7 Next-Hop MTU */
73 /* followed by original IP header and initial portion of data */
74};
75
76#define click_icmp_unreach click_icmp
77#define click_icmp_sourcequench click_icmp
78#define click_icmp_timxceed click_icmp
79#define click_icmp_echo click_icmp_sequenced
80
81
82/* ICMP type definitions and (indented) code definitions */
83#define ICMP_ECHOREPLY 0 /* echo reply */
84#define ICMP_UNREACH 3 /* dest unreachable, codes: */
85#define ICMP_UNREACH_NET 0 /* bad net */
86#define ICMP_UNREACH_HOST 1 /* bad host */
87#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
88#define ICMP_UNREACH_PORT 3 /* bad port */
89#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
90#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
91#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
92#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
93#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
94#define ICMP_UNREACH_NET_PROHIB 9 /* net prohibited access */
95#define ICMP_UNREACH_HOST_PROHIB 10 /* host prohibited access */
96#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
97#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
98#define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohib */
99#define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host prec violation */
100#define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* prec cutoff */
101#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
102#define ICMP_REDIRECT 5 /* shorter route, codes: */
103#define ICMP_REDIRECT_NET 0 /* for network */
104#define ICMP_REDIRECT_HOST 1 /* for host */
105#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
106#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
107#define ICMP_ECHO 8 /* echo service */
108#define ICMP_ROUTERADVERT 9 /* router advertisement */
109#define ICMP_ROUTERSOLICIT 10 /* router solicitation */
110#define ICMP_TIMXCEED 11 /* time exceeded, code: */
111#define ICMP_TIMXCEED_TRANSIT 0 /* ttl==0 in transit */
112#define ICMP_TIMXCEED_REASSEMBLY 1 /* ttl==0 in reassembly */
113#define ICMP_PARAMPROB 12 /* ip header bad */
114#define ICMP_PARAMPROB_ERRATPTR 0 /* error at param ptr */
115#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
116#define ICMP_PARAMPROB_LENGTH 2 /* bad length */
117#define ICMP_TSTAMP 13 /* timestamp request */
118#define ICMP_TSTAMPREPLY 14 /* timestamp reply */
119#define ICMP_IREQ 15 /* information request */
120#define ICMP_IREQREPLY 16 /* information reply */
121#define ICMP_MASKREQ 17 /* address mask request */
122#define ICMP_MASKREQREPLY 18 /* address mask reply */
123
124static inline size_t
125click_icmp_hl(uint8_t icmp_type)
126{
127 if (icmp_type == ICMP_TSTAMP || icmp_type == ICMP_TSTAMPREPLY)
128 return sizeof(click_icmp_tstamp);
129 else
130 return sizeof(click_icmp);
131}
132
133#endif
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