1 #ifndef __NET_TUN_PROTO_H
2 #define __NET_TUN_PROTO_H
3 
4 #include <linux/kernel.h>
5 
6 /* One byte protocol values as defined by VXLAN-GPE and NSH. These will
7  * hopefully get a shared IANA registry.
8  */
9 #define TUN_P_IPV4      0x01
10 #define TUN_P_IPV6      0x02
11 #define TUN_P_ETHERNET  0x03
12 #define TUN_P_NSH       0x04
13 #define TUN_P_MPLS_UC   0x05
14 
tun_p_to_eth_p(u8 proto)15 static inline __be16 tun_p_to_eth_p(u8 proto)
16 {
17 	switch (proto) {
18 	case TUN_P_IPV4:
19 		return htons(ETH_P_IP);
20 	case TUN_P_IPV6:
21 		return htons(ETH_P_IPV6);
22 	case TUN_P_ETHERNET:
23 		return htons(ETH_P_TEB);
24 	case TUN_P_NSH:
25 		return htons(ETH_P_NSH);
26 	case TUN_P_MPLS_UC:
27 		return htons(ETH_P_MPLS_UC);
28 	}
29 	return 0;
30 }
31 
tun_p_from_eth_p(__be16 proto)32 static inline u8 tun_p_from_eth_p(__be16 proto)
33 {
34 	switch (proto) {
35 	case htons(ETH_P_IP):
36 		return TUN_P_IPV4;
37 	case htons(ETH_P_IPV6):
38 		return TUN_P_IPV6;
39 	case htons(ETH_P_TEB):
40 		return TUN_P_ETHERNET;
41 	case htons(ETH_P_NSH):
42 		return TUN_P_NSH;
43 	case htons(ETH_P_MPLS_UC):
44 		return TUN_P_MPLS_UC;
45 	}
46 	return 0;
47 }
48 
49 #endif
50