54 lines
1.4 KiB
C

#ifndef ETHERLIB_IPV4_PACKET_H
#define ETHERLIB_IPV4_PACKET_H
#include <stdint.h>
#include "../../packet_registry.h"
#include "../../packet_sieve.h"
#define ETH_IPv4_PACKET_CLASS (0x0800)
/**
* IPv4 header structure
*/
typedef struct {
PcktPropsHeader
// 1. 32-bit
uint8_t IHL; ///< header size
uint8_t Version; ///< version (always 4)
uint8_t DSF; ///< service type
uint16_t TotalLength; ///< total packet length
// 2. 32-bit
uint16_t Identification; ///< identification
uint8_t Flags; ///< packet flags
uint16_t FragmentOffset; ///< packet fragmentation offset
// 3. 32-bit
uint8_t TTL; ///< Time-To-Live
uint8_t Protocol; ///< Protocol
uint16_t HeaderChecksum; ///< header IP-checksum
// 4. 32-bit
uint32_t SourceIPAddr; ///< source IP-address
uint32_t DestIPAddr; ///< destination IP-address
} IPv4Props;
/**
* Parse raw IPv4 packets.
* @param hdr pointer to the IPv4 packet header
* @param size total packet size
* @param props pointer to property storage
* @return Protocol on success or -1 on failure
*/
int parse_ipv4(const uint8_t *hdr, uint32_t size, PcktProps * props);
/**
* Insert IPv4 header.
* @param hdr space where the header is to be inserted
* @param headers linked list of header, top is always relevant
*/
void insert_ipv4_header(uint8_t * hdr, const PcktHeaderElement * headers);
#endif //ETHERLIB_IPV4_PACKET_H