101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
#ifndef __LINUX_GRE_H
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#define __LINUX_GRE_H
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#include <linux/skbuff.h>
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#include <net/ip_tunnels.h>
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#define GREPROTO_CISCO 0
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#define GREPROTO_PPTP 1
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#define GREPROTO_MAX 2
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#define GRE_IP_PROTO_MAX 2
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struct gre_protocol {
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int (*handler)(struct sk_buff *skb);
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void (*err_handler)(struct sk_buff *skb, u32 info);
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};
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struct gre_base_hdr {
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__be16 flags;
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__be16 protocol;
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};
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#define GRE_HEADER_SECTION 4
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int gre_add_protocol(const struct gre_protocol *proto, u8 version);
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int gre_del_protocol(const struct gre_protocol *proto, u8 version);
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struct gre_cisco_protocol {
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int (*handler)(struct sk_buff *skb, const struct tnl_ptk_info *tpi);
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int (*err_handler)(struct sk_buff *skb, u32 info,
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const struct tnl_ptk_info *tpi);
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u8 priority;
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};
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int gre_cisco_register(struct gre_cisco_protocol *proto);
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int gre_cisco_unregister(struct gre_cisco_protocol *proto);
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int gre_offload_init(void);
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void gre_offload_exit(void);
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void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
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int hdr_len);
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struct sk_buff *gre_handle_offloads(struct sk_buff *skb, bool gre_csum);
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static inline int ip_gre_calc_hlen(__be16 o_flags)
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{
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int addend = 4;
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if (o_flags&TUNNEL_CSUM)
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addend += 4;
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if (o_flags&TUNNEL_KEY)
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addend += 4;
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if (o_flags&TUNNEL_SEQ)
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addend += 4;
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return addend;
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}
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static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
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{
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__be16 tflags = 0;
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if (flags & GRE_CSUM)
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tflags |= TUNNEL_CSUM;
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if (flags & GRE_ROUTING)
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tflags |= TUNNEL_ROUTING;
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if (flags & GRE_KEY)
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tflags |= TUNNEL_KEY;
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if (flags & GRE_SEQ)
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tflags |= TUNNEL_SEQ;
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if (flags & GRE_STRICT)
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tflags |= TUNNEL_STRICT;
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if (flags & GRE_REC)
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tflags |= TUNNEL_REC;
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if (flags & GRE_VERSION)
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tflags |= TUNNEL_VERSION;
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return tflags;
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}
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static inline __be16 tnl_flags_to_gre_flags(__be16 tflags)
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{
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__be16 flags = 0;
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if (tflags & TUNNEL_CSUM)
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flags |= GRE_CSUM;
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if (tflags & TUNNEL_ROUTING)
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flags |= GRE_ROUTING;
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if (tflags & TUNNEL_KEY)
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flags |= GRE_KEY;
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if (tflags & TUNNEL_SEQ)
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flags |= GRE_SEQ;
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if (tflags & TUNNEL_STRICT)
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flags |= GRE_STRICT;
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if (tflags & TUNNEL_REC)
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flags |= GRE_REC;
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if (tflags & TUNNEL_VERSION)
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flags |= GRE_VERSION;
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return flags;
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}
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#endif
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