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gre: Allow multiple protocol listener for gre protocol.

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Currently there is only one user is allowed to register for gre
protocol.  Following patch adds de-multiplexer.  So that multiple
modules can listen on gre protocol e.g. kernel gre devices and ovs.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar
2013-06-17 17:49:38 -07:00
committed by David S. Miller
parent 20fd4d1f04
commit bda7bb4634
3 changed files with 267 additions and 151 deletions
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24
include/net/gre.h
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@@ -7,6 +7,7 @@
#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);
@@ -22,6 +23,29 @@ struct gre_base_hdr {
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);
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;