1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *
16 * icmp.c - convenience functions for translating ICMP and ICMPv6 packets.
17 */
18
19#ifndef __ICMP_H__
20#define __ICMP_H__
21
22#include <stdint.h>
23
24// Guesses the number of hops a received packet has traversed based on its TTL.
25uint8_t icmp_guess_ttl(uint8_t ttl);
26
27// Determines whether an ICMP type is an error message.
28int is_icmp_error(uint8_t type);
29
30// Determines whether an ICMPv6 type is an error message.
31int is_icmp6_error(uint8_t type);
32
33// Maps ICMP types to ICMPv6 types. Partial implementation of RFC 6145, section 4.2.
34uint8_t icmp_to_icmp6_type(uint8_t type, uint8_t code);
35
36// Maps ICMP codes to ICMPv6 codes. Partial implementation of RFC 6145, section 4.2.
37uint8_t icmp_to_icmp6_code(uint8_t type, uint8_t code);
38
39// Maps ICMPv6 types to ICMP types. Partial implementation of RFC 6145, section 5.2.
40uint8_t icmp6_to_icmp_type(uint8_t type, uint8_t code);
41
42// Maps ICMPv6 codes to ICMP codes. Partial implementation of RFC 6145, section 5.2.
43uint8_t icmp6_to_icmp_code(uint8_t type, uint8_t code);
44
45#endif /* __ICMP_H__ */
46