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. 25 uint8_t icmp_guess_ttl(uint8_t ttl); 26 27 // Determines whether an ICMP type is an error message. 28 int is_icmp_error(uint8_t type); 29 30 // Determines whether an ICMPv6 type is an error message. 31 int is_icmp6_error(uint8_t type); 32 33 // Maps ICMP types to ICMPv6 types. Partial implementation of RFC 6145, section 4.2. 34 uint8_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. 37 uint8_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. 40 uint8_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. 43 uint8_t icmp6_to_icmp_code(uint8_t type, uint8_t code); 44 45 #endif /* __ICMP_H__ */ 46