IP_TUNNEL_KEY_SIZE 194 include/net/ip_tunnels.h if (sizeof(*key) != IP_TUNNEL_KEY_SIZE) IP_TUNNEL_KEY_SIZE 195 include/net/ip_tunnels.h memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE, IP_TUNNEL_KEY_SIZE 196 include/net/ip_tunnels.h 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);