GRE_STRICT 77 include/net/gre.h if (flags & GRE_STRICT) GRE_STRICT 100 include/net/gre.h flags |= GRE_STRICT; GRE_STRICT 39 include/uapi/linux/if_tunnel.h #define GRE_IS_STRICT(f) ((f) & GRE_STRICT)