if.h

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/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Global definitions for the INET interface module.
 *
 * Version:	@(#)if.h	1.0.2	04/18/93
 *
 * Authors:	Original taken from Berkeley UNIX 4.3, (c) UCB 1982-1988
 *		Ross Biro, <[e-mail]>
 *		Fred N. van Kempen, <[e-mail]>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */
#ifndef _LINUX_IF_H
#define _LINUX_IF_H

/* Standard interface flags. */
#define	IFF_UP		0x1		/* interface is up		*/
#define	IFF_BROADCAST	0x2		/* broadcast address valid	*/
#define	IFF_DEBUG	0x4		/* turn on debugging		*/
#define	IFF_LOOPBACK	0x8		/* is a loopback net		*/
#define	IFF_POINTOPOINT	0x10		/* interface is has p-p link	*/
#define	IFF_NOTRAILERS	0x20		/* avoid use of trailers	*/
#define	IFF_RUNNING	0x40		/* resources allocated		*/
#define	IFF_NOARP	0x80		/* no ARP protocol		*/
#define	IFF_PROMISC	0x100		/* receive all packets		*/
/* Not supported */
#define	IFF_ALLMULTI	0x200		/* receive all multicast packets*/

#define IFF_MASTER	0x400		/* master of a load balancer 	*/
#define IFF_SLAVE	0x800		/* slave of a load balancer	*/

#define IFF_MULTICAST	0x1000		/* Supports multicast		*/

/*
 * The ifaddr structure contains information about one address
 * of an interface.  They are maintained by the different address
 * families, are allocated and attached when an address is set,
 * and are linked together so all addresses for an interface can
 * be located.
 */
#define IFHWADDRLEN	6
#define	IFNAMSIZ	16
struct ifreq_t {
	char name[IFNAMSIZ];
	union {
		sockaddr_t addr;
		sockaddr_t dstaddr;
		sockaddr_t broadaddr;
		sockaddr_t netmask;
		sockaddr_t hwaddr; /* mac address */
		short flags;
		int metric;
		int mtu;
		char data[0];
	} u;
};

/*
 * Structure used in SIOCGIFCONF request.
 * Used to retrieve interface configuration
 * for machine (useful for programs which
 * must know all networks accessible).
 */
struct ifconf_t {
	int buflen;
	union {
		char *buf;
		ifreq_t *ifreq;
	} u;
};

#endif /* _LINUX_IF_H */