ICMP: Internet Control Message Protocol

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Presentation transcript:

ICMP: Internet Control Message Protocol Reading: Section 14.4 Fall 2004 FSU CIS 5930 Internet Protocols

Structure of ICMP packet Version IHL TOSt/Codepoint 3 7 15 31 IP packet format Total length Identification D F M Fragment Offset Time to Live Protocol Checksum Source address Destination address Optionens (optional) padding type code Checksum ICMP data (variable) Fall 2004 FSU CIS 5930 Internet Protocols

FSU CIS 5930 Internet Protocols Sending ICMP packets icmp_send() Some sanity check Preparing ICMP packet Copy some data from the concerned packet ip_build_xmit() Fall 2004 FSU CIS 5930 Internet Protocols

Handling incoming ICMP packets icmp_recv() Some sanity check icmp_reply() Replying ICMP request message icmp_redirect() Updating routing table when Redirect ICMP recved icmp_unreach() Handling: destination unreachable, source quench, and time exceeded icmp_echo(), icmp_timestamp() Handling Echo and Timestamp requests Fall 2004 FSU CIS 5930 Internet Protocols

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