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#ifndef __LINUX_GRE_WRAPPER_H
#define __LINUX_GRE_WRAPPER_H
#include <linux/skbuff.h>
#include <net/ip_tunnels.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37) || \
defined(HAVE_GRE_CISCO_REGISTER)
#include_next <net/gre.h>
#endif
#ifndef HAVE_GRE_CISCO_REGISTER
/* GRE demux not available, implement our own demux. */
#define MAX_GRE_PROTO_PRIORITY 255
struct gre_cisco_protocol {
int (*handler)(struct sk_buff *skb, const struct tnl_ptk_info *tpi);
int (*err_handler)(struct sk_buff *skb, u32 info,
const struct tnl_ptk_info *tpi);
u8 priority;
};
#define gre_cisco_register rpl_gre_cisco_register
int gre_cisco_register(struct gre_cisco_protocol *proto);
#define gre_cisco_unregister rpl_gre_cisco_unregister
int gre_cisco_unregister(struct gre_cisco_protocol *proto);
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,10,0)
struct gre_base_hdr {
__be16 flags;
__be16 protocol;
};
#define GRE_HEADER_SECTION 4
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 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 /* LINUX_VERSION_CODE < KERNEL_VERSION(3,10,0) */
#endif /* HAVE_GRE_CISCO_REGISTER */
#ifndef GRE_USE_KERNEL_GRE_HANDLE_OFFLOADS
#define gre_build_header rpl_gre_build_header
void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
int hdr_len);
#define gre_handle_offloads rpl_gre_handle_offloads
struct sk_buff *gre_handle_offloads(struct sk_buff *skb, bool gre_csum);
#define ip_gre_calc_hlen rpl_ip_gre_calc_hlen
static inline int ip_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;
}
#else
static inline struct sk_buff *rpl_gre_handle_offloads(struct sk_buff *skb,
bool gre_csum)
{
if (skb->encapsulation && skb_is_gso(skb)) {
kfree_skb(skb);
return ERR_PTR(-ENOSYS);
}
return gre_handle_offloads(skb, gre_csum);
}
#define gre_handle_offloads rpl_gre_handle_offloads
#endif
#endif
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