erspan: build the header with the right proto according to erspan_ver
As said in draft-foschiano-erspan-03#section4: Different frame variants known as "ERSPAN Types" can be distinguished based on the GRE "Protocol Type" field value: Type I and II's value is 0x88BE while Type III's is 0x22EB [ETYPES]. So set it properly in erspan_xmit() according to erspan_ver. While at it, also remove the unused parameter 'proto' in erspan_fb_xmit(). Fixes: 94d7d8f2 ("ip6_gre: add erspan v2 support") Reported-by: Jianlin Shi <jishi@redhat.com> Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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