/***************************************************************************** * ip.h: Internet Protocol (IP) ***************************************************************************** * Copyright (C) 2015 VideoLAN * * Authors: Benjamin Cohen * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject * to the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *****************************************************************************/ /* * Normative references: * - IETF RFC 791 INTERNET PROTOCOL (September 1981) * - IETF RFC 790 ASSIGNED NUMBERS (September 1981) */ #ifndef __BITSTREAM_IETF_IP_H__ #define __BITSTREAM_IETF_IP_H__ #include #ifdef __cplusplus extern "C" { #endif /* * Reminder: IP header 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Version| IHL |Type of Service| Total Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Identification |Flags| Fragment Offset | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Time to Live | Protocol | Header Checksum | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Source Address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Destination Address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Options | Padding | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ #define IP_HEADER_MINSIZE 20 #define IP_PROTO_ICMP 1 #define IP_PROTO_TCP 6 #define IP_PROTO_UDP 17 static inline void ip_set_version(uint8_t *p_ip, uint8_t version) { p_ip[0] &= ~0xf0; p_ip[0] |= (version & 0xf) << 4; } static inline uint8_t ip_get_version(const uint8_t *p_ip) { return (p_ip[0] >> 4) & 0xf; } static inline void ip_set_ihl(uint8_t *p_ip, uint8_t ihl) { p_ip[0] &= ~0xf; p_ip[0] |= (ihl & 0xf); } static inline uint8_t ip_get_ihl(const uint8_t *p_ip) { return p_ip[0] & 0xf; } static inline void ip_set_tos(uint8_t *p_ip, uint8_t tos) { p_ip[1] = tos; } static inline uint8_t ip_get_tos(const uint8_t *p_ip) { return p_ip[1]; } static inline void ip_set_len(uint8_t *p_ip, uint16_t len) { p_ip[2] = (len & 0xff00) >> 8; p_ip[3] = (len & 0xff); } static inline uint16_t ip_get_len(const uint8_t *p_ip) { return (p_ip[2] << 8) | p_ip[3]; } static inline void ip_set_id(uint8_t *p_ip, uint16_t id) { p_ip[4] = (id & 0xff00) >> 8; p_ip[5] = (id & 0xff); } static inline uint16_t ip_get_id(const uint8_t *p_ip) { return (p_ip[4] << 8) | p_ip[5]; } static inline void ip_set_flag_reserved(uint8_t *p_ip, uint8_t flag) { p_ip[6] &= ~0x80; p_ip[6] |= (flag & 1) << 7; } static inline uint8_t ip_get_flag_reservered(const uint8_t *p_ip) { return (p_ip[6] & 0x80); } static inline void ip_set_flag_df(uint8_t *p_ip, uint8_t flag) { p_ip[6] &= ~0x40; p_ip[6] |= (flag & 1) << 6; } static inline uint8_t ip_get_flag_df(const uint8_t *p_ip) { return (p_ip[6] & 0x40); } static inline void ip_set_flag_mf(uint8_t *p_ip, uint8_t flag) { p_ip[6] &= ~0x20; p_ip[6] |= (flag & 1) << 5; } static inline uint8_t ip_get_flag_mf(const uint8_t *p_ip) { return (p_ip[6] & 0x20); } static inline void ip_set_frag_offset(uint8_t *p_ip, uint16_t offset) { p_ip[6] &= ~0x1f; p_ip[6] |= (offset & 0x1f00) >> 8; p_ip[7] = (offset & 0xff); } static inline uint8_t ip_get_frag_offset(const uint8_t *p_ip) { return ((p_ip[6] & 0x1f) << 8 | p_ip[7]); } static inline void ip_set_ttl(uint8_t *p_ip, uint8_t ttl) { p_ip[8] = ttl; } static inline uint8_t ip_get_ttl(const uint8_t *p_ip) { return p_ip[8]; } static inline void ip_set_proto(uint8_t *p_ip, uint8_t proto) { p_ip[9] = proto; } static inline uint8_t ip_get_proto(const uint8_t *p_ip) { return p_ip[9]; } static inline void ip_set_cksum(uint8_t *p_ip, uint16_t cksum) { p_ip[10] = (cksum & 0xff00) >> 8; p_ip[11] = (cksum & 0xff); } static inline uint16_t ip_get_cksum(const uint8_t *p_ip) { return (p_ip[10] << 8) | p_ip[11]; } static inline void ip_set_srcaddr(uint8_t *p_ip, uint32_t addr) { p_ip[12] = (addr & 0xff000000) >> 24; p_ip[13] = (addr & 0x00ff0000) >> 16; p_ip[14] = (addr & 0x0000ff00) >> 8; p_ip[15] = (addr & 0x000000ff); } static inline uint32_t ip_get_srcaddr(const uint8_t *p_ip) { return (p_ip[12] << 24) | (p_ip[13] << 16) | (p_ip[14] << 8) | p_ip[15]; } static inline uint8_t *ip_srcaddr(uint8_t *p_ip) { return p_ip + 12; } static inline void ip_set_dstaddr(uint8_t *p_ip, uint32_t addr) { p_ip[16] = (addr & 0xff000000) >> 24; p_ip[17] = (addr & 0x00ff0000) >> 16; p_ip[18] = (addr & 0x0000ff00) >> 8; p_ip[19] = (addr & 0x000000ff); } static inline uint8_t *ip_dstaddr(uint8_t *p_ip) { return p_ip + 16; } static inline uint32_t ip_get_dstaddr(const uint8_t *p_ip) { return (p_ip[16] << 24) | (p_ip[17] << 16) | (p_ip[18] << 8) | p_ip[19]; } static inline uint8_t *ip_payload(uint8_t *p_ip) { return p_ip + 4 * ip_get_ihl(p_ip); /* ihl is in 32b words */ } #ifdef __cplusplus } #endif #endif