ip6_gre: only increase err_count for some certain type icmpv6 in ip6gre_err
The similar fix in patch 'ipip: only increase err_count for some certain type icmp in ipip_err' is needed for ip6gre_err. In Jianlin's case, udp netperf broke even when receiving a TooBig icmpv6 packet. Fixes: c12b395a ("gre: Support GRE over IPv6") Reported-by: NJianlin Shi <jishi@redhat.com> Signed-off-by: NXin Long <lucien.xin@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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