11.9 Reply Processing

Team-Fly     TCP/IP Illustrated, Volume 2: The Implementation By Gary R. Wright, W. Richard Stevens Table of Contents Chapter 11.  ICMP: Internet Control Message Protocol 11.9 Reply Processing The kernel does not process any of the ICMP reply messages. ICMP requests are generated by processes, never by the kernel, so the kernel passes any replies that it receives to processes waiting for ICMP messages. In addition, the ICMP router discovery messages are passed to rip_input. Figure 11.28. icmp_input function: reply messages. 307-322 No actions are required by the kernel for ICMP reply messages, so execution continues after the switch statement at raw. Note that the default case for the switch statement (unrecognized ICMP messages) also passes control to the code at raw. Team-Fly     Top