icmp.h File Reference

#include "lwip/opt.h"
#include "lwip/pbuf.h"
#include "lwip/ip_addr.h"
#include "lwip/netif.h"
#include "lwip/prot/icmp.h"
#include "lwip/icmp6.h"

Enumerations
enum	icmp_dur_type {   ICMP_DUR_NET = 0, ICMP_DUR_HOST = 1, ICMP_DUR_PROTO = 2, ICMP_DUR_PORT = 3,   ICMP_DUR_FRAG = 4, ICMP_DUR_SR = 5 }
enum	icmp_te_type { ICMP_TE_TTL = 0, ICMP_TE_FRAG = 1 }

Functions
void	icmp_input (struct pbuf *p, struct netif *inp)
void	icmp_dest_unreach (struct pbuf *p, enum icmp_dur_type t)
void	icmp_time_exceeded (struct pbuf *p, enum icmp_te_type t)

Detailed Description

ICMP API

Enumeration Type Documentation

icmp_dur_type

enum icmp_dur_type

ICMP destination unreachable codes

Enumerator
ICMP_DUR_NET	net unreachable
ICMP_DUR_HOST	host unreachable
ICMP_DUR_PROTO	protocol unreachable
ICMP_DUR_PORT	port unreachable
ICMP_DUR_FRAG	fragmentation needed and DF set
ICMP_DUR_SR	source route failed

icmp_te_type

enum icmp_te_type

ICMP time exceeded codes

Enumerator
ICMP_TE_TTL	time to live exceeded in transit
ICMP_TE_FRAG	fragment reassembly time exceeded

Function Documentation

icmp_dest_unreach()

void icmp_dest_unreach	(	struct pbuf *	p,
		enum icmp_dur_type	t
	)

Send an icmp 'destination unreachable' packet, called from ip_input() if the transport layer protocol is unknown and from udp_input() if the local port is not bound.

Parameters

p	the input packet for which the 'unreachable' should be sent, p->payload pointing to the IP header
t	type of the 'unreachable' packet

icmp_input()

void icmp_input	(	struct pbuf *	p,
		struct netif *	inp
	)

Processes ICMP input packets, called from ip_input().

Currently only processes icmp echo requests and sends out the echo response.

Parameters

p	the icmp echo request packet, p->payload pointing to the icmp header
inp	the netif on which this packet was received

icmp_time_exceeded()

void icmp_time_exceeded	(	struct pbuf *	p,
		enum icmp_te_type	t
	)

Send a 'time exceeded' packet, called from ip_forward() if TTL is 0.

Parameters

p	the input packet for which the 'time exceeded' should be sent, p->payload pointing to the IP header
t	type of the 'time exceeded' packet