cregit-Linux how code gets into the kernel

Release 4.14 include/net/tun_proto.h

Directory: include/net
#ifndef __NET_TUN_PROTO_H

#define __NET_TUN_PROTO_H

#include <linux/kernel.h>

/* One byte protocol values as defined by VXLAN-GPE and NSH. These will
 * hopefully get a shared IANA registry.
 */

#define TUN_P_IPV4      0x01

#define TUN_P_IPV6      0x02

#define TUN_P_ETHERNET  0x03

#define TUN_P_NSH       0x04

#define TUN_P_MPLS_UC   0x05


static inline __be16 tun_p_to_eth_p(u8 proto) { switch (proto) { case TUN_P_IPV4: return htons(ETH_P_IP); case TUN_P_IPV6: return htons(ETH_P_IPV6); case TUN_P_ETHERNET: return htons(ETH_P_TEB); case TUN_P_NSH: return htons(ETH_P_NSH); case TUN_P_MPLS_UC: return htons(ETH_P_MPLS_UC); } return 0; }

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static inline u8 tun_p_from_eth_p(__be16 proto) { switch (proto) { case htons(ETH_P_IP): return TUN_P_IPV4; case htons(ETH_P_IPV6): return TUN_P_IPV6; case htons(ETH_P_TEB): return TUN_P_ETHERNET; case htons(ETH_P_NSH): return TUN_P_NSH; case htons(ETH_P_MPLS_UC): return TUN_P_MPLS_UC; } return 0; }

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#endif

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Directory: include/net
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