Layer 3 IPv4 header. More...

#include "L3_IPv4.hpp"

Public Attributes
uint8_t	ver_and_ihl
	Version number (should contain `4`) and internet header length (normally `5`). More...

uint8_t	dscp_and_ecn
	Differentiated services code point, aka DiffServ (RFC 2474) and explicit congestion notification (RFC 3168). More...

uint16_t	total_length
	Entire packet size in bytes, including the layer 3 header. More...

uint16_t	id
	Identification of fragments within an IP datagram. More...

uint16_t	flags_and_frag_offset
	Flags (3 bits) and fragment offset (13 bits). More...

uint8_t	ttl
	Time-to-live. In practice this field has become a hop count. More...

uint8_t	protocol
	Layer 4 (`IPPROTO_ICMP`, `IPPROTO_TCP`, `IPPROTO_UDP`, ...). More...

uint16_t	checksum
	16-bit checksum. More...

IPv4_ADDR	src_ipv4
	Source in network byte order. More...

IPv4_ADDR	dst_ipv4
	Destination in network byte order. More...

uint8_t	payload [0]
	Start of L4 (only if there are no IPv4 options). More...

Detailed Description

Layer 3 IPv4 header.

Note: Not included in this structure is the optional IPv4 options if inet_header_len > 5.

Member Data Documentation

uint16_t Myra::L3_IPv4::Header::checksum

16-bit checksum.

uint8_t Myra::L3_IPv4::Header::dscp_and_ecn

Differentiated services code point, aka DiffServ (RFC 2474) and explicit congestion notification (RFC 3168).

IPv4_ADDR Myra::L3_IPv4::Header::dst_ipv4

Destination in network byte order.

uint16_t Myra::L3_IPv4::Header::flags_and_frag_offset

Flags (3 bits) and fragment offset (13 bits).

uint16_t Myra::L3_IPv4::Header::id

Identification of fragments within an IP datagram.

uint8_t Myra::L3_IPv4::Header::payload[0]

Start of L4 (only if there are no IPv4 options).

uint8_t Myra::L3_IPv4::Header::protocol

Layer 4 (IPPROTO_ICMP, IPPROTO_TCP, IPPROTO_UDP, ...).

IPv4_ADDR Myra::L3_IPv4::Header::src_ipv4

Source in network byte order.

uint16_t Myra::L3_IPv4::Header::total_length

Entire packet size in bytes, including the layer 3 header.

uint8_t Myra::L3_IPv4::Header::ttl

Time-to-live. In practice this field has become a hop count.

uint8_t Myra::L3_IPv4::Header::ver_and_ihl

Version number (should contain 4) and internet header length (normally 5).

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