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/* net/if.h -- declarations for inquiring about network interfaces

   Copyright (C) 1997,98,99,2000,2001 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#ifndef _NET_IF_H

#define _NET_IF_H       1

#include <features.h>

#ifdef __USE_MISC

# include <sys/types.h>

# include <sys/socket.h>

#endif

/* Length of interface name.  */

#define IF_NAMESIZE     16

struct if_nameindex

  {

    unsigned int if_index;      /* 1, 2, ... */

    char *if_name;              /* null terminated name: "eth0", ... */

  };

#ifdef __USE_MISC

/* Standard interface flags. */

enum

  {

    IFF_UP = 0x1,               /* Interface is up.  */

# define IFF_UP IFF_UP

    IFF_BROADCAST = 0x2,        /* Broadcast address valid.  */

# define IFF_BROADCAST  IFF_BROADCAST

    IFF_DEBUG = 0x4,            /* Turn on debugging.  */

# define IFF_DEBUG      IFF_DEBUG

    IFF_LOOPBACK = 0x8,         /* Is a loopback net.  */

# define IFF_LOOPBACK   IFF_LOOPBACK

    IFF_POINTOPOINT = 0x10,     /* Interface is point-to-point link.  */

# define IFF_POINTOPOINT IFF_POINTOPOINT

    IFF_NOTRAILERS = 0x20,      /* Avoid use of trailers.  */

# define IFF_NOTRAILERS IFF_NOTRAILERS

    IFF_RUNNING = 0x40,         /* Resources allocated.  */

# define IFF_RUNNING    IFF_RUNNING

    IFF_NOARP = 0x80,           /* No address resolution protocol.  */

# define IFF_NOARP      IFF_NOARP

    IFF_PROMISC = 0x100,        /* Receive all packets.  */

# define IFF_PROMISC    IFF_PROMISC

    /* Not supported */

    IFF_ALLMULTI = 0x200,       /* Receive all multicast packets.  */

# define IFF_ALLMULTI   IFF_ALLMULTI

    IFF_MASTER = 0x400,         /* Master of a load balancer.  */

# define IFF_MASTER     IFF_MASTER

    IFF_SLAVE = 0x800,          /* Slave of a load balancer.  */

# define IFF_SLAVE      IFF_SLAVE

    IFF_MULTICAST = 0x1000,     /* Supports multicast.  */

# define IFF_MULTICAST  IFF_MULTICAST

    IFF_PORTSEL = 0x2000,       /* Can set media type.  */

# define IFF_PORTSEL    IFF_PORTSEL

    IFF_AUTOMEDIA = 0x4000      /* Auto media select active.  */

# define IFF_AUTOMEDIA  IFF_AUTOMEDIA

  };

/* 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.  */

struct ifaddr

  {

    struct sockaddr ifa_addr;   /* Address of interface.  */

    union

      {

        struct sockaddr ifu_broadaddr;

        struct sockaddr ifu_dstaddr;

      } ifa_ifu;

    struct iface *ifa_ifp;      /* Back-pointer to interface.  */

    struct ifaddr *ifa_next;    /* Next address for interface.  */

  };

# define ifa_broadaddr  ifa_ifu.ifu_broadaddr   /* broadcast address    */

# define ifa_dstaddr    ifa_ifu.ifu_dstaddr     /* other end of link    */

/* Device mapping structure. I'd just gone off and designed a

   beautiful scheme using only loadable modules with arguments for

   driver options and along come the PCMCIA people 8)

   Ah well. The get() side of this is good for WDSETUP, and it'll be

   handy for debugging things. The set side is fine for now and being

   very small might be worth keeping for clean configuration.  */

struct ifmap

  {

    unsigned long int mem_start;

    unsigned long int mem_end;

    unsigned short int base_addr;

    unsigned char irq;

    unsigned char dma;

    unsigned char port;

    /* 3 bytes spare */

  };

/* Interface request structure used for socket ioctl's.  All interface

   ioctl's must have parameter definitions which begin with ifr_name.

   The remainder may be interface specific.  */

struct ifreq

  {

# define IFHWADDRLEN    6

# define IFNAMSIZ       IF_NAMESIZE

    union

      {

        char ifrn_name[IFNAMSIZ];       /* Interface name, e.g. "en0".  */

      } ifr_ifrn;

    union

      {

        struct sockaddr ifru_addr;

        struct sockaddr ifru_dstaddr;

        struct sockaddr ifru_broadaddr;

        struct sockaddr ifru_netmask;

        struct sockaddr ifru_hwaddr;

        short int ifru_flags;

        int ifru_ivalue;

        int ifru_mtu;

        struct ifmap ifru_map;

        char ifru_slave[IFNAMSIZ];      /* Just fits the size */

        char ifru_newname[IFNAMSIZ];

        __caddr_t ifru_data;

      } ifr_ifru;

  };

# define ifr_name       ifr_ifrn.ifrn_name      /* interface name       */

# define ifr_hwaddr     ifr_ifru.ifru_hwaddr    /* MAC address          */

# define ifr_addr       ifr_ifru.ifru_addr      /* address              */

# define ifr_dstaddr    ifr_ifru.ifru_dstaddr   /* other end of p-p lnk */

# define ifr_broadaddr  ifr_ifru.ifru_broadaddr /* broadcast address    */

# define ifr_netmask    ifr_ifru.ifru_netmask   /* interface net mask   */

# define ifr_flags      ifr_ifru.ifru_flags     /* flags                */

# define ifr_metric     ifr_ifru.ifru_ivalue    /* metric               */

# define ifr_mtu        ifr_ifru.ifru_mtu       /* mtu                  */

# define ifr_map        ifr_ifru.ifru_map       /* device map           */

# define ifr_slave      ifr_ifru.ifru_slave     /* slave device         */

# define ifr_data       ifr_ifru.ifru_data      /* for use by interface */

# define ifr_ifindex    ifr_ifru.ifru_ivalue    /* interface index      */

# define ifr_bandwidth  ifr_ifru.ifru_ivalue    /* link bandwidth       */

# define ifr_qlen       ifr_ifru.ifru_ivalue    /* queue length         */

# define ifr_newname    ifr_ifru.ifru_newname   /* New name             */

# define _IOT_ifreq     _IOT(_IOTS(char),IFNAMSIZ,_IOTS(char),16,0,0)

# define _IOT_ifreq_short _IOT(_IOTS(char),IFNAMSIZ,_IOTS(short),1,0,0)

# define _IOT_ifreq_int _IOT(_IOTS(char),IFNAMSIZ,_IOTS(int),1,0,0)

/* Structure used in SIOCGIFCONF request.  Used to retrieve interface

   configuration for machine (useful for programs which must know all

   networks accessible).  */

struct ifconf

  {

    int ifc_len;                        /* Size of buffer.  */

    union

      {

        __caddr_t ifcu_buf;

        struct ifreq *ifcu_req;

      } ifc_ifcu;

  };

# define ifc_buf        ifc_ifcu.ifcu_buf       /* Buffer address.  */

# define ifc_req        ifc_ifcu.ifcu_req       /* Array of structures.  */

# define _IOT_ifconf _IOT(_IOTS(struct ifconf),1,0,0,0,0) /* not right */

#endif  /* Misc.  */

__BEGIN_DECLS

/* Convert an interface name to an index, and vice versa.  */

extern unsigned int if_nametoindex (__const char *__ifname) __THROW;

extern char *if_indextoname (unsigned int __ifindex, char *__ifname) __THROW;

/* Return a list of all interfaces and their indices.  */

extern struct if_nameindex *if_nameindex (void) __THROW;

/* Free the data returned from if_nameindex.  */

extern void if_freenameindex (struct if_nameindex *__ptr) __THROW;

__END_DECLS

#endif /* net/if.h */