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ICMP
[Protocols]

RFC 792 Internet Control Message Protocol. More...

Functions
void	NutIcmpInput (NUTDEVICE *dev, NETBUF *nb)
	Handle incoming ICMP packets.
int	NutIcmpOutput (u_char type, u_long dest, NETBUF *nb)
	Send an ICMP datagram.
int	NutIcmpReply (u_char type, u_char code, u_long spec, u_long dest, NETBUF *nb)
	Send an ICMP message to a given destination.

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Detailed Description

RFC 792 Internet Control Message Protocol.

Provides routing, diagnostic and error functionality for IP. Although ICMP messages are encapsulated within IP datagrams, ICMP processing is considered to be part of the IP layer.

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Function Documentation

void NutIcmpInput (  NUTDEVICE *    dev, NETBUF *    nb )

Handle incoming ICMP packets. Note: This routine is called by the IP layer on incoming ICMP datagrams. Applications typically do not call this function. Parameters: dev  Identifies the device that received the packet. nb  Pointer to a network buffer structure containing the ICMP datagram.

int NutIcmpOutput (  u_char    type, u_long    dest, NETBUF *    nb )

Send an ICMP datagram. Known ICMP types are: ICMP_ECHOREPLY Echo reply ICMP_UNREACH Destination unreachable ICMP_SOURCEQUENCH Packet lost ICMP_REDIRECT Shorter route ICMP_ECHO Echo reply ICMP_ROUTERADVERT Router advertisement ICMP_ROUTERSOLICIT Router solicitation ICMP_TIMXCEED Time exceeded ICMP_PARAMPROB Bad IP header ICMP_TSTAMP Timestamp request ICMP_TSTAMPREPLY Timestamp reply ICMP_IREQ Information request ICMP_IREQREPLY Information reply ICMP_MASKREQ Address mask request ICMP_MASKREPLY Address mask reply Parameters: type  Type of the ICMP message. dest  Destination IP address. nb  Network buffer structure containing the datagram. Returns: 0 on success, -1 otherwise.

int NutIcmpReply (  u_char    type, u_char    code, u_long    spec, u_long    dest, NETBUF *    nb )

Send an ICMP message to a given destination. Parameters: type  Type of the ICMP message. See NutIcmpOutput() for a list of valid types. code  Type subcode. spec  Type specific data item. dest  IP address of the target. nb  Network buffer structure containing the meesage to be sent. The structure must have been allocated by a previous call NutNetBufAlloc() and will be freed if this function returns with an error. Returns: 0 on success, -1 otherwise.

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