eth_common.h File Reference

Common definitons for Ethernet-based transports. More...

#include <arpa/inet.h>
#include <ifaddrs.h>
#include <linux/if_packet.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <cassert>
#include <sstream>
#include <string>
#include "utils.h"

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Classes
struct	eth_routing_info_t
struct	eth_hdr_t
struct	ipv4_hdr_t
struct	udp_hdr_t

Functions
static std::string	mac_to_string (const uint8_t *mac)
static uint32_t	ipv4_from_str (const char *ip)
	Get the network-byte-order IPv4 address from a human-readable IP string. More...
static std::string	ipv4_to_string (uint32_t ipv4_addr)
	Convert a network-byte-order IPv4 address to a human-readable IP string. More...
struct eth_hdr_t	__attribute__ ((packed))
std::string	to_string () const
static std::string	frame_header_to_string (const uint8_t *buf)
static void	gen_eth_header (eth_hdr_t *eth_header, const uint8_t *src_mac, const uint8_t *dst_mac)
	Fill in Ethernet header eth_header using the source and destination MAC. More...
static void	gen_ipv4_header (ipv4_hdr_t *ipv4_hdr, uint32_t src_ip, uint32_t dst_ip, uint16_t data_size)
static void	gen_udp_header (udp_hdr_t *udp_hdr, uint16_t src_port, uint16_t dst_port, uint16_t data_size)
static uint32_t	get_interface_ipv4_addr (const std::string &interface)
	Return the IPv4 address of a kernel-visible interface in host-byte order. More...
static void	fill_interface_mac (const std::string &interface, uint8_t *mac)
	Fill the MAC address of kernel-visible interface. More...

Variables
static constexpr uint16_t	kIPEtherType = 0x800
static constexpr uint16_t	kIPHdrProtocol = 0x11
uint8_t	dst_mac [6]
uint8_t	src_mac [6]
uint16_t	eth_type
uint8_t	ihl
uint8_t	version
uint8_t	ecn
uint8_t	dscp
uint16_t	tot_len
uint16_t	id
uint16_t	frag_off
uint8_t	ttl
uint8_t	protocol
uint16_t	check
uint32_t	src_ip
uint32_t	dst_ip
uint16_t	src_port
uint16_t	dst_port
uint16_t	len
static constexpr size_t	kInetHdrsTotSize

Detailed Description

Common definitons for Ethernet-based transports.

Function Documentation

__attribute__()

struct eth_hdr_t __attribute__

(

(packed)

)

fill_interface_mac()

static void fill_interface_mac ( const std::string &  interface, uint8_t *  mac  )

inlinestatic

Fill the MAC address of kernel-visible interface.

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frame_header_to_string()

static std::string frame_header_to_string ( const uint8_t *  buf )

inlinestatic

Return a string representation of the Ethernet + IPv4 + UDP frame headers starting at buf

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gen_eth_header()

static void gen_eth_header ( eth_hdr_t *  eth_header, const uint8_t *  src_mac, const uint8_t *  dst_mac  )

inlinestatic

Fill in Ethernet header eth_header using the source and destination MAC.

gen_ipv4_header()

static void gen_ipv4_header ( ipv4_hdr_t *  ipv4_hdr, uint32_t  src_ip, uint32_t  dst_ip, uint16_t  data_size  )

inlinestatic

Format the IPv4 header for a UDP packet. All value arguments are in host-byte order. data_size is the data payload size in the UDP packet.

gen_udp_header()

static void gen_udp_header ( udp_hdr_t *  udp_hdr, uint16_t  src_port, uint16_t  dst_port, uint16_t  data_size  )

inlinestatic

Format the UDP header for a UDP packet. All value arguments are in host-byte order. data_size is the data payload size in the UDP packet.

get_interface_ipv4_addr()

static uint32_t get_interface_ipv4_addr ( const std::string &  interface )

inlinestatic

Return the IPv4 address of a kernel-visible interface in host-byte order.

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ipv4_from_str()

static uint32_t ipv4_from_str ( const char *  ip )

inlinestatic

Get the network-byte-order IPv4 address from a human-readable IP string.

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ipv4_to_string()

static std::string ipv4_to_string ( uint32_t  ipv4_addr )

inlinestatic

Convert a network-byte-order IPv4 address to a human-readable IP string.

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mac_to_string()

static std::string mac_to_string ( const uint8_t *  mac )

inlinestatic

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to_string()

std::string to_string

(

)

const

Variable Documentation

check

uint16_t check

dscp

uint8_t dscp

dst_ip

uint32_t dst_ip

dst_mac

uint8_t dst_mac[6]

dst_port

uint16_t dst_port

ecn

uint8_t ecn

eth_type

uint16_t eth_type

frag_off

uint16_t frag_off

id

uint16_t id

ihl

uint8_t ihl

kInetHdrsTotSize

constexpr size_t kInetHdrsTotSize

staticconstexpr

Initial value:

=
    sizeof(eth_hdr_t) + sizeof(ipv4_hdr_t) + sizeof(udp_hdr_t)

kIPEtherType

constexpr uint16_t kIPEtherType = 0x800

staticconstexpr

kIPHdrProtocol

constexpr uint16_t kIPHdrProtocol = 0x11

staticconstexpr

len

uint16_t len

protocol

uint8_t protocol

src_ip

uint32_t src_ip

src_mac

uint8_t src_mac[6]

src_port

uint16_t src_port

tot_len

uint16_t tot_len

ttl

uint8_t ttl

version

uint8_t version