The IPv4 header. More...

#include <ipv4.h>

Data Fields
uint8_t	ihl:4

uint8_t	version:4

union {
uint8_t tos

uint8_t dscp_ecn

struct {
uint8_t ecn:2

uint8_t dscp:6

}

};

uint16_t	tot_len

uint16_t	id

union {
uint16_t frag_off

struct {
uint8_t frag_off1:5

uint8_t mf:1

uint8_t df:1

uint8_t reserved:1

uint8_t frag_off2

}

};

uint8_t	ttl

uint8_t	protocol

uint16_t	check

uint32_t	saddr

uint32_t	daddr

uint8_t	options [0]

Detailed Description

The IPv4 header.

Field Documentation

◆ @4

union { ... }

◆ @6

union { ... }

◆ check

uint16_t ipv4_hdr::check

The checksum over the IP header

◆ daddr

uint32_t ipv4_hdr::daddr

The destination IP address

◆ df

uint8_t ipv4_hdr::df

◆ dscp

uint8_t ipv4_hdr::dscp

◆ dscp_ecn

uint8_t ipv4_hdr::dscp_ecn

The combined DSCP and ECN fields

◆ ecn

uint8_t ipv4_hdr::ecn

◆ frag_off

uint16_t ipv4_hdr::frag_off

The IP flags + Fragment Offset in 64-bit words

◆ frag_off1

uint8_t ipv4_hdr::frag_off1

◆ frag_off2

uint8_t ipv4_hdr::frag_off2

The Fragment Offset in 64-bit words (part 2)

◆ id

uint16_t ipv4_hdr::id

The IDentification of the packet

◆ ihl

uint8_t ipv4_hdr::ihl

◆ mf

uint8_t ipv4_hdr::mf

◆ options

uint8_t ipv4_hdr::options[0]

The IP options start here

◆ protocol

uint8_t ipv4_hdr::protocol

The Protocol of the next header

◆ reserved

uint8_t ipv4_hdr::reserved

◆ saddr

uint32_t ipv4_hdr::saddr

The source IP address

◆ tos

uint8_t ipv4_hdr::tos

The Type Of Service (TOS)

◆ tot_len

uint16_t ipv4_hdr::tot_len

The Total Length (header + payload)

◆ ttl

uint8_t ipv4_hdr::ttl

The Time To Live (TTL)

◆ version

uint8_t ipv4_hdr::version

The documentation for this struct was generated from the following file:

ipv4.h

Data Fields