netfilter: gre: Use consistent GRE_* macros instead of ones defined by netfilter.
There are already some GRE_* macros in kernel, so it is unnecessary to define these macros. And remove some useless macros Signed-off-by: Gao Feng <fgao@ikuai8.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Pablo Neira Ayuso

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@@ -39,6 +39,7 @@
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#define GRE_IS_REC(f) ((f) & GRE_REC)
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#define GRE_IS_ACK(f) ((f) & GRE_ACK)
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#define GRE_VERSION_0 __cpu_to_be16(0x0000)
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#define GRE_VERSION_1 __cpu_to_be16(0x0001)
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#define GRE_PROTO_PPP __cpu_to_be16(0x880b)
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#define GRE_PPTP_KEY_MASK __cpu_to_be32(0xffff)
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