1 #ifndef __NET_TUN_PROTO_H
2 #define __NET_TUN_PROTO_H
3 
4 #include <linux/if_ether.h>
5 #include <linux/types.h>
6 
7 /* One byte protocol values as defined by VXLAN-GPE and NSH. These will
8  * hopefully get a shared IANA registry.
9  */
10 #define TUN_P_IPV4      0x01
11 #define TUN_P_IPV6      0x02
12 #define TUN_P_ETHERNET  0x03
13 #define TUN_P_NSH       0x04
14 #define TUN_P_MPLS_UC   0x05
15 
tun_p_to_eth_p(u8 proto)16 static inline __be16 tun_p_to_eth_p(u8 proto)
17 {
18 	switch (proto) {
19 	case TUN_P_IPV4:
20 		return htons(ETH_P_IP);
21 	case TUN_P_IPV6:
22 		return htons(ETH_P_IPV6);
23 	case TUN_P_ETHERNET:
24 		return htons(ETH_P_TEB);
25 	case TUN_P_NSH:
26 		return htons(ETH_P_NSH);
27 	case TUN_P_MPLS_UC:
28 		return htons(ETH_P_MPLS_UC);
29 	}
30 	return 0;
31 }
32 
tun_p_from_eth_p(__be16 proto)33 static inline u8 tun_p_from_eth_p(__be16 proto)
34 {
35 	switch (proto) {
36 	case htons(ETH_P_IP):
37 		return TUN_P_IPV4;
38 	case htons(ETH_P_IPV6):
39 		return TUN_P_IPV6;
40 	case htons(ETH_P_TEB):
41 		return TUN_P_ETHERNET;
42 	case htons(ETH_P_NSH):
43 		return TUN_P_NSH;
44 	case htons(ETH_P_MPLS_UC):
45 		return TUN_P_MPLS_UC;
46 	}
47 	return 0;
48 }
49 
50 #endif
51