ipv4.h

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#ifndef KERNEL_NET_IPV4_H
#define KERNEL_NET_IPV4_H
 
#include <kernel/error.h>
#include <kernel/net.h>
#include <kernel/types.h>
 
#include <utils/compiler.h>
 
#include <arch.h>
 
struct packet;
struct net_route;
 
#define IPV4_VERSION 4
#define IPV4_MIN_LENGTH 20
#define IPV4_DEFAULT_TTL 64
 
struct PACKED ALIGNED(sizeof(uint16_t)) ipv4_header {
#if defined(ARCH_LITTLE_ENDIAN)
    uint8_t ihl : 4;
    uint8_t version : 4;
#else
    uint8_t version : 4;
    uint8_t ihl : 4;
#endif
    uint8_t tos;
    __be uint16_t tot_len;
    __be uint16_t id;
    __be uint16_t frag_off;
    uint8_t ttl;
    uint8_t protocol;
    __be uint16_t check;
    __be ipv4_t saddr;
    __be ipv4_t daddr;
};
 
static_assert(sizeof(struct ipv4_header) == IPV4_MIN_LENGTH);
 
#define IPV4_FRAG_MASK 0x1FFF
#define IPV4_RESERVED (0x4 << 13)
#define IPV4_NOFRAG (0x2 << 13)
#define IPV4_MORE_FRAG (0x1 << 13)
 
static inline uint16_t ipv4_fragment_offset(const struct ipv4_header *iphdr)
{
    return ntohs(iphdr->frag_off) & IPV4_FRAG_MASK;
}
 
static inline bool ipv4_more_framents(const struct ipv4_header *iphdr)
{
    return ntohs(iphdr->frag_off) & IPV4_MORE_FRAG;
}
 
static inline bool ipv4_is_fragmented(const struct ipv4_header *iphdr)
{
    return ntohs(iphdr->frag_off) & (IPV4_MORE_FRAG | IPV4_FRAG_MASK);
}
 
/***/
static inline bool ipv4_is_multicast(__be ipv4_t addr)
{
    return (ntohl(addr) >> 28) == 0xE;
}
 
/***/
static inline bool ipv4_is_broadcast(__be ipv4_t addr)
{
    return addr == 0XFFFFFFFF;
}
 
error_t ipv4_receive_packet(struct packet *packet);
 
struct packet *ipv4_build_packet(const struct net_route *, u8 protocol,
                                 const void *payload, size_t);
 
static inline __be ipv4_t IPV4(uint8_t a, uint8_t b, uint8_t c, uint8_t d)
{
    return htonl(a << 24 | b << 16 | c << 8 | d);
}
 
#define FMT_IP "%u.%u.%u.%u"
#define LOG_IP(ip)                                                 \
    ((uint8_t *)&ip)[0], ((uint8_t *)&ip)[1], ((uint8_t *)&ip)[2], \
        ((uint8_t *)&ip)[3]
 
#endif /* KERNEL_NET_IPV4_H */