#ifndef __LINUX_GRE_H #define __LINUX_GRE_H #include #include struct gre_base_hdr { __be16 flags; __be16 protocol; } __packed; struct gre_full_hdr { struct gre_base_hdr fixed_header; __be16 csum; __be16 reserved1; __be32 key; __be32 seq; } __packed; #define GRE_HEADER_SECTION 4 #define GREPROTO_CISCO 0 #define GREPROTO_PPTP 1 #define GREPROTO_MAX 2 #define GRE_IP_PROTO_MAX 2 struct gre_protocol { int (*handler)(struct sk_buff *skb); void (*err_handler)(struct sk_buff *skb, u32 info); }; int gre_add_protocol(const struct gre_protocol *proto, u8 version); 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, __be16 proto, int nhs); 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; } static inline __sum16 gre_checksum(struct sk_buff *skb) { __wsum csum; if (skb->ip_summed == CHECKSUM_PARTIAL) csum = lco_csum(skb); else csum = skb_checksum(skb, 0, skb->len, 0); return csum_fold(csum); } static inline void gre_build_header(struct sk_buff *skb, int hdr_len, __be16 flags, __be16 proto, __be32 key, __be32 seq) { struct gre_base_hdr *greh; skb_push(skb, hdr_len); skb_set_inner_protocol(skb, proto); skb_reset_transport_header(skb); greh = (struct gre_base_hdr *)skb->data; greh->flags = gre_tnl_flags_to_gre_flags(flags); greh->protocol = proto; if (flags & (TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_SEQ)) { __be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4); if (flags & TUNNEL_SEQ) { *ptr = seq; ptr--; } if (flags & TUNNEL_KEY) { *ptr = key; ptr--; } if (flags & TUNNEL_CSUM && !(skb_shinfo(skb)->gso_type & (SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) { *ptr = 0; *(__sum16 *)ptr = gre_checksum(skb); } } } #endif d41c29a'>include/drm
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