This patch fixes a kernel crashing bug when using NAT. The crash occurs in
the case when we send out a UDP packet to a closed port on another host,
with the UDP packet being SNATed. The remote host replies with an ICMP
port unreachable (type 3, code 3). We need to adjust the ICMP packet,
This patch fixes a kernel crashing bug when using NAT. The crash occurs in
the case when we send out a UDP packet to a closed port on another host,
with the UDP packet being SNATed. The remote host replies with an ICMP
port unreachable (type 3, code 3). We need to adjust the ICMP packet,
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