// nat_transport.h — NAT transport layer (TUN + ETCP protocol handling)
#ifndef NAT_TRANSPORT_H
#define NAT_TRANSPORT_H

#include <stdint.h>

struct tun_if;
struct ETCP_CONN;

struct nat_transport_ctx {
    uint64_t self_node_id;
    uint64_t nat_via_node_id;
    struct tun_if* nat_tun;
    int initialized;
};

struct UTUN_INSTANCE;

int  nat_transport_init(struct UTUN_INSTANCE* inst);
void nat_transport_destroy(struct UTUN_INSTANCE* inst);

#endif