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

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Copyright (C) 1997-2018 Free Software Foundation, Inc.

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This file is part of the GNU C Library.

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

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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

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

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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Lesser General Public License for more details.

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

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License along with the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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#ifndef _NET_IF_H

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#define _NET_IF_H 1

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#include <features.h>

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#ifdef __USE_MISC

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# include <sys/types.h>

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# include <sys/socket.h>

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#endif

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/* Length of interface name. */

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#define IF_NAMESIZE 16

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struct if_nameindex

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{

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

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

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};

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#ifdef __USE_MISC

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/* Standard interface flags. */

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enum

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{

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

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# define IFF_UP IFF_UP

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

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# define IFF_BROADCAST IFF_BROADCAST

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

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# define IFF_DEBUG IFF_DEBUG

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

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# define IFF_LOOPBACK IFF_LOOPBACK

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

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# define IFF_POINTOPOINT IFF_POINTOPOINT

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

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# define IFF_NOTRAILERS IFF_NOTRAILERS

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

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# define IFF_RUNNING IFF_RUNNING

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

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# define IFF_NOARP IFF_NOARP

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

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# define IFF_PROMISC IFF_PROMISC

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/* Not supported */

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

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# define IFF_ALLMULTI IFF_ALLMULTI

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

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# define IFF_MASTER IFF_MASTER

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

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# define IFF_SLAVE IFF_SLAVE

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

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# define IFF_MULTICAST IFF_MULTICAST

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

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# define IFF_PORTSEL IFF_PORTSEL

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

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# define IFF_AUTOMEDIA IFF_AUTOMEDIA

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IFF_DYNAMIC = 0x8000 /* Dialup device with changing addresses. */

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# define IFF_DYNAMIC IFF_DYNAMIC

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};

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/* The ifaddr structure contains information about one address of an

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interface. They are maintained by the different address families,

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are allocated and attached when an address is set, and are linked

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together so all addresses for an interface can be located. */

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struct ifaddr

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{

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

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union

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{

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struct sockaddr ifu_broadaddr;

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struct sockaddr ifu_dstaddr;

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} ifa_ifu;

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

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

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};

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

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

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

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beautiful scheme using only loadable modules with arguments for

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driver options and along come the PCMCIA people 8)

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

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

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

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struct ifmap

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{

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unsigned long int mem_start;

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unsigned long int mem_end;

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unsigned short int base_addr;

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unsigned char irq;

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unsigned char dma;

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unsigned char port;

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/* 3 bytes spare */

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};

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

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

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The remainder may be interface specific. */

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struct ifreq

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{

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# define IFHWADDRLEN 6

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# define IFNAMSIZ IF_NAMESIZE

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union

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{

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

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} ifr_ifrn;

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union

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{

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struct sockaddr ifru_addr;

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struct sockaddr ifru_dstaddr;

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struct sockaddr ifru_broadaddr;

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struct sockaddr ifru_netmask;

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struct sockaddr ifru_hwaddr;

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short int ifru_flags;

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int ifru_ivalue;

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int ifru_mtu;

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struct ifmap ifru_map;

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

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char ifru_newname[IFNAMSIZ];

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__caddr_t ifru_data;

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} ifr_ifru;

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};

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

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

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# define ifr_addr ifr_ifru.ifru_addr /* address */

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

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

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

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# define ifr_flags ifr_ifru.ifru_flags /* flags */

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# define ifr_metric ifr_ifru.ifru_ivalue /* metric */

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# define ifr_mtu ifr_ifru.ifru_mtu /* mtu */

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

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

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

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

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

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

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

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

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

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

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

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configuration for machine (useful for programs which must know all

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networks accessible). */

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struct ifconf

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{

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int ifc_len; /* Size of buffer. */

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union

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{

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__caddr_t ifcu_buf;

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struct ifreq *ifcu_req;

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} ifc_ifcu;

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};

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

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

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

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#endif /* Misc. */

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__BEGIN_DECLS

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

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

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

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

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extern struct if_nameindex *if_nameindex (void) __THROW;

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/* Free the data returned from if_nameindex. */

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extern void if_freenameindex (struct if_nameindex *__ptr) __THROW;

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__END_DECLS

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#endif /* net/if.h */

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