ICMP

Internet Control Message Protocol. More...

Functions
thread	icmpDaemon (void)
syscall	icmpDestUnreach (const struct packet *unreached, uchar code)
syscall	icmpEchoRequest (struct netaddr *dst, ushort id, ushort seq)
syscall	icmpInit (void)
syscall	icmpRecv (struct packet *pkt)
syscall	icmpRedirect (struct packet *redir, uchar code, struct rtEntry *route)
syscall	icmpSend (struct packet *pkt, uchar type, uchar code, uint datalen, struct netaddr *src, struct netaddr *dst)
syscall	icmpTimeExceeded (struct packet *unreached, uchar code)

Detailed Description

Internet Control Message Protocol.

Function Documentation

thread icmpDaemon

(

void

)

Daemon that responds to ICMP echo requests (pings).

syscall icmpDestUnreach	(	const struct packet *	unreached,
		uchar	code
	)

Compose ICMP Destination Unreachable message.

Parameters

unreached	packet that could not be sent
code	ICMP destination unreachable code number

Returns

OK if packet was sent, otherwise SYSERR

syscall icmpEchoRequest	(	struct netaddr *	dst,
		ushort	id,
		ushort	seq
	)

Send an ICMP Echo (Ping) Request.

Parameters

dst	destination address
id	ping stream identifier
seq	sequence number

Returns

OK if packet was sent, otherwise SYSERR

syscall icmpInit

(

void

)

Initializes ICMP daemon.

Returns

OK if initialization is successful, otherwise SYSERR

syscall icmpRecv

(

struct packet *

pkt

)

Processes an incoming ICMP packet.

Parameters

pkt	pointer to the incoming packet return OK if packet was processed succesfully, otherwise SYSERR

syscall icmpRedirect	(	struct packet *	redir,
		uchar	code,
		struct rtEntry *	route
	)

Compose ICMP Redirect message.

Parameters

redir	packet that should have gone somewhere else
code	ICMP redirect code number
route	new gateway for packet

Returns

OK if packet was sent, otherwise SYSERR

syscall icmpSend	(	struct packet *	pkt,
		uchar	type,
		uchar	code,
		uint	datalen,
		struct netaddr *	src,
		struct netaddr *	dst
	)

Send an ICMP (Internet Control Message Protocol) packet.

Parameters

pkt	Packet containing the ICMP data. pkt->curr must be positioned on the ICMP data, pkt->len must be the length of the ICMP data, and there must be at least enough space between pkt->data and pkt->curr for the ICMP, IPv4, and link-level headers to be attached.
type	ICMP type field to use.
code	ICMP code field to use.
datalen	Length of the ICMP data payload.
src	Source network address. If src->type == 0, then the source is automatically set to the address of the interface on which the packet is sent. dst Destination network address.

Returns

::OK if packet was successfully sent; otherwise ::SYSERR or another error code returned by ipv4Send().

syscall icmpTimeExceeded	(	struct packet *	unreached,
		uchar	code
	)

Compose ICMP Time Exceeded message.

Parameters

unreached	packet that could not be sent
code	ICMP destination unreachable code number

Returns

OK if packet was sent, otherwise SYSERR