TCP: check min TTL on received ICMP packets
This adds RFC5082 checks for TTL on received ICMP packets. It adds some security against spoofed ICMP packets disrupting GTSM protected sessions. Signed-off-by: NStephen Hemminger <shemminger@vyatta.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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