common/include/decode_ipv4.h


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#ifndef _DECODE_IPV4_H
#define _DECODE_IPV4_H

#ifdef __cpluscplus
extern "C"
{
#endif

#include "public.h"

#define IPV4_HEADER_LEN 20

    typedef struct ipv4_header_s
    {
        uint8_t ip_verhl; // version & header length
        uint8_t ip_tos;
        uint16_t ip_len;
        uint16_t ip_id;
        uint16_t ip_off;
        uint8_t ip_ttl;
        uint8_t ip_proto;
        uint16_t ip_csum;
        union
        {
            struct
            {
                struct in_addr ip_src;
                struct in_addr ip_dst;
            } ip4_un1;
            uint16_t ip_addrs[4];
        } ip4_hdrun1;
    } __attribute__((__packed__)) ipv4_header_t;

    typedef struct ipv4_info_s
    {
        char src_addr[INET_ADDRSTRLEN];
        char dst_addr[INET_ADDRSTRLEN];

        ipv4_header_t *hdr;
        uint8_t *payload;
        uint8_t next_protocol;

        uint32_t hdr_len;
        uint32_t opts_len;
        uint32_t payload_len;
    } ipv4_info_t;

    int decode_ipv4(ipv4_info_t *packet, const uint8_t *data, uint32_t len);
    int dump_ipv4_info(ipv4_info_t *packet, char *buff, size_t size);

#ifdef __cpluscplus
}
#endif

#endif