net: tftpput: Add support for receiving ICMP packets

ICMP packets can tell you when there is no server at the other end. It
is useful for tftp to figure this out, so that a quick error can be
displayed, rather than pointlessly retrying.

This adds an ICMP packet handler to the net interface.

Signed-off-by: Simon Glass <sjg@chromium.org>
2 files changed