erspan: auto detect truncated packets.
Currently the truncated bit is set only when the mirrored packet is larger than mtu. For certain cases, the packet might already been truncated before sending to the erspan tunnel. In this case, the patch detect whether the IP header's total length is larger than the actual skb->len. If true, this indicated that the mirrored packet is truncated and set the erspan truncate bit. I tested the patch using bpf_skb_change_tail helper function to shrink the packet size and send to erspan tunnel. Reported-by: Xiaoyan Jin <xiaoyanj@vmware.com> Signed-off-by: William Tu <u9012063@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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