icmp.c File Reference

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)

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Detailed Description

ICMP - Internet Control Message Protocol

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Function Documentation

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

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 ip header
	inp	the netif on which this packet was received

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

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