passt/passt.h

#define UNIX_SOCK_PATH	"/tmp/passt.socket"

/**
 * struct tap_msg - Generic message descriptor for arrays of messages
 * @start:	Pointer to message start
 * @l4_start:	Pointer to L4 header
 * @len:	Message length, with L2 headers
 * @l4_len:	Message length, with L4 headers
 */
struct tap_msg {
	char *start;
	char *l4h;
	size_t len;
	size_t l4_len;
};

#include "icmp.h"
#include "tcp.h"

/**
 * struct ctx - Execution context
 * @epollfd:	file descriptor for epoll instance
 * @fd_unix:	AF_UNIX socket for tap file descriptor
 * @v4:		Enable IPv4 transport
 * @mac:	Host MAC address
 * @mac_guest:	Guest MAC address
 * @addr4:	IPv4 address for external, routable interface
 * @mask4:	IPv4 netmask, network order
 * @gw4:	Default IPv4 gateway, network order
 * @dns4:	IPv4 DNS address, network order
 * @v6:		Enable IPv6 transport
 * @addr6:	IPv6 address for external, routable interface
 * @gw6:	Default IPv6 gateway
 * @dns4:	IPv6 DNS address
 * @ifn:	Name of routable interface
 */
struct ctx {
	int epollfd;
	int fd_unix;
	unsigned char mac[ETH_ALEN];
	unsigned char mac_guest[ETH_ALEN];

	int v4;
	unsigned long addr4;
	unsigned long mask4;
	unsigned long gw4;
	unsigned long dns4;

	int v6;
	struct in6_addr addr6;
	struct in6_addr addr6_guest;
	struct in6_addr gw6;
	struct in6_addr dns6;

	char ifn[IF_NAMESIZE];

	struct icmp_ctx icmp;
	struct tcp_ctx tcp;
};