linux_kernel/include/net/udp_tunnel.h

#ifndef __NET_UDP_TUNNEL_H
#define __NET_UDP_TUNNEL_H

struct udp_port_cfg {
	u8			family;

	/* Used only for kernel-created sockets */
	union {
		struct in_addr		local_ip;
#if IS_ENABLED(CONFIG_IPV6)
		struct in6_addr		local_ip6;
#endif
	};

	union {
		struct in_addr		peer_ip;
#if IS_ENABLED(CONFIG_IPV6)
		struct in6_addr		peer_ip6;
#endif
	};

	__be16			local_udp_port;
	__be16			peer_udp_port;
	unsigned int		use_udp_checksums:1,
				use_udp6_tx_checksums:1,
				use_udp6_rx_checksums:1;
};

int udp_sock_create(struct net *net, struct udp_port_cfg *cfg,
		    struct socket **sockp);

#endif