gre: Move utility functions to common headers

[cascardo/linux.git] / include / net / gre.h

diff --git a/include/net/gre.h b/include/net/gre.h
index 97eafdc..3959158 100644 (file)
--- a/include/net/gre.h
+++ b/include/net/gre.h
@@ -25,4 +25,64 @@ int gre_del_protocol(const struct gre_protocol *proto, u8 version);
 
 struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
                                       u8 name_assign_type);
+int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
+                    bool *csum_err, int *hdr_len);
+
+static inline int gre_calc_hlen(__be16 o_flags)
+{
+       int addend = 4;
+
+       if (o_flags & TUNNEL_CSUM)
+               addend += 4;
+       if (o_flags & TUNNEL_KEY)
+               addend += 4;
+       if (o_flags & TUNNEL_SEQ)
+               addend += 4;
+       return addend;
+}
+
+static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
+{
+       __be16 tflags = 0;
+
+       if (flags & GRE_CSUM)
+               tflags |= TUNNEL_CSUM;
+       if (flags & GRE_ROUTING)
+               tflags |= TUNNEL_ROUTING;
+       if (flags & GRE_KEY)
+               tflags |= TUNNEL_KEY;
+       if (flags & GRE_SEQ)
+               tflags |= TUNNEL_SEQ;
+       if (flags & GRE_STRICT)
+               tflags |= TUNNEL_STRICT;
+       if (flags & GRE_REC)
+               tflags |= TUNNEL_REC;
+       if (flags & GRE_VERSION)
+               tflags |= TUNNEL_VERSION;
+
+       return tflags;
+}
+
+static inline __be16 gre_tnl_flags_to_gre_flags(__be16 tflags)
+{
+       __be16 flags = 0;
+
+       if (tflags & TUNNEL_CSUM)
+               flags |= GRE_CSUM;
+       if (tflags & TUNNEL_ROUTING)
+               flags |= GRE_ROUTING;
+       if (tflags & TUNNEL_KEY)
+               flags |= GRE_KEY;
+       if (tflags & TUNNEL_SEQ)
+               flags |= GRE_SEQ;
+       if (tflags & TUNNEL_STRICT)
+               flags |= GRE_STRICT;
+       if (tflags & TUNNEL_REC)
+               flags |= GRE_REC;
+       if (tflags & TUNNEL_VERSION)
+               flags |= GRE_VERSION;
+
+       return flags;
+}
+
 #endif