forked from luck/tmp_suning_uos_patched
c50cd35788
Similarly to TCP/UDP offloading, move all related GRE functions to gre_offload.c to make things more explicit and similar to the rest of the code. Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
#ifndef __LINUX_GRE_H
|
|
#define __LINUX_GRE_H
|
|
|
|
#include <linux/skbuff.h>
|
|
#include <net/ip_tunnels.h>
|
|
|
|
#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);
|
|
};
|
|
|
|
struct gre_base_hdr {
|
|
__be16 flags;
|
|
__be16 protocol;
|
|
};
|
|
#define GRE_HEADER_SECTION 4
|
|
|
|
int gre_add_protocol(const struct gre_protocol *proto, u8 version);
|
|
int gre_del_protocol(const struct gre_protocol *proto, u8 version);
|
|
|
|
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;
|
|
};
|
|
|
|
int gre_cisco_register(struct gre_cisco_protocol *proto);
|
|
int gre_cisco_unregister(struct gre_cisco_protocol *proto);
|
|
|
|
int gre_offload_init(void);
|
|
void gre_offload_exit(void);
|
|
|
|
void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
|
|
int hdr_len);
|
|
struct sk_buff *gre_handle_offloads(struct sk_buff *skb, bool gre_csum);
|
|
|
|
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;
|
|
}
|
|
|
|
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
|