include/linux/if.h

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Global definitions for the INET interface module.
   7  *
   8  * Version:     @(#)if.h        1.0.2   04/18/93
   9  *
  10  * Authors:     Original taken from Berkeley UNIX 4.3, (c) UCB 1982-1988
  11  *              Ross Biro, <bir7@leland.Stanford.Edu>
  12  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  13  *
  14  *              This program is free software; you can redistribute it and/or
  15  *              modify it under the terms of the GNU General Public License
  16  *              as published by the Free Software Foundation; either version
  17  *              2 of the License, or (at your option) any later version.
  18  */
  19 #ifndef _LINUX_IF_H
  20 #define _LINUX_IF_H
  21
  22 #include <linux/types.h>                /* for "__kernel_caddr_t" et al */
  23 #include <linux/socket.h>               /* for "struct sockaddr" et al  */
  24
  25 /* Standard interface flags. */
  26 #define IFF_UP          0x1             /* interface is up              */
  27 #define IFF_BROADCAST   0x2             /* broadcast address valid      */
  28 #define IFF_DEBUG       0x4             /* turn on debugging            */
  29 #define IFF_LOOPBACK    0x8             /* is a loopback net            */
  30 #define IFF_POINTOPOINT 0x10            /* interface is has p-p link    */
  31 #define IFF_NOTRAILERS  0x20            /* avoid use of trailers        */
  32 #define IFF_RUNNING     0x40            /* resources allocated          */
  33 #define IFF_NOARP       0x80            /* no ARP protocol              */
  34 #define IFF_PROMISC     0x100           /* receive all packets          */
  35 #define IFF_ALLMULTI    0x200           /* receive all multicast packets*/
  36
  37 #define IFF_MASTER      0x400           /* master of a load balancer    */
  38 #define IFF_SLAVE       0x800           /* slave of a load balancer     */
  39
  40 #define IFF_MULTICAST   0x1000          /* Supports multicast           */
  41
  42 #define IFF_VOLATILE    (IFF_LOOPBACK|IFF_POINTOPOINT|IFF_BROADCAST|IFF_ALLMULTI)
  43
  44 #define IFF_PORTSEL     0x2000          /* can set media type           */
  45 #define IFF_AUTOMEDIA   0x4000          /* auto media select active     */
  46 #define IFF_DYNAMIC     0x8000          /* dialup device with changing addresses*/
  47
  48 #ifdef __KERNEL__
  49 /*
  50  * The ifaddr structure contains information about one address
  51  * of an interface.  They are maintained by the different address
  52  * families, are allocated and attached when an address is set,
  53  * and are linked together so all addresses for an interface can
  54  * be located.
  55  */
  56
  57 struct ifaddr
  58 {
  59         struct sockaddr ifa_addr;       /* address of interface         */
  60         union {
  61                 struct sockaddr ifu_broadaddr;
  62                 struct sockaddr ifu_dstaddr;
  63         } ifa_ifu;
  64         struct iface            *ifa_ifp;       /* back-pointer to interface    */
  65         struct ifaddr           *ifa_next;      /* next address for interface   */
  66 };
  67
  68 #define ifa_broadaddr   ifa_ifu.ifu_broadaddr   /* broadcast address    */
  69 #define ifa_dstaddr     ifa_ifu.ifu_dstaddr     /* other end of link    */
  70
  71 #endif /* __KERNEL__ */
  72
  73 /*
  74  *      Device mapping structure. I'd just gone off and designed a
  75  *      beautiful scheme using only loadable modules with arguments
  76  *      for driver options and along come the PCMCIA people 8)
  77  *
  78  *      Ah well. The get() side of this is good for WDSETUP, and it'll
  79  *      be handy for debugging things. The set side is fine for now and
  80  *      being very small might be worth keeping for clean configuration.
  81  */
  82
  83 struct ifmap
  84 {
  85         unsigned long mem_start;
  86         unsigned long mem_end;
  87         unsigned short base_addr;
  88         unsigned char irq;
  89         unsigned char dma;
  90         unsigned char port;
  91         /* 3 bytes spare */
  92 };
  93
  94 /*
  95  * Interface request structure used for socket
  96  * ioctl's.  All interface ioctl's must have parameter
  97  * definitions which begin with ifr_name.  The
  98  * remainder may be interface specific.
  99  */
 100
 101 struct ifreq
 102 {
 103 #define IFHWADDRLEN     6
 104 #define IFNAMSIZ        16
 105         union
 106         {
 107                 char    ifrn_name[IFNAMSIZ];            /* if name, e.g. "en0" */
 108         } ifr_ifrn;
 109
 110         union {
 111                 struct  sockaddr ifru_addr;
 112                 struct  sockaddr ifru_dstaddr;
 113                 struct  sockaddr ifru_broadaddr;
 114                 struct  sockaddr ifru_netmask;
 115                 struct  sockaddr ifru_hwaddr;
 116                 short   ifru_flags;
 117                 int     ifru_ivalue;
 118                 int     ifru_mtu;
 119                 struct  ifmap ifru_map;
 120                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 121                 char    ifru_newname[IFNAMSIZ];
 122                 char *  ifru_data;
 123         } ifr_ifru;
 124 };
 125
 126 #define ifr_name        ifr_ifrn.ifrn_name      /* interface name       */
 127 #define ifr_hwaddr      ifr_ifru.ifru_hwaddr    /* MAC address          */
 128 #define ifr_addr        ifr_ifru.ifru_addr      /* address              */
 129 #define ifr_dstaddr     ifr_ifru.ifru_dstaddr   /* other end of p-p lnk */
 130 #define ifr_broadaddr   ifr_ifru.ifru_broadaddr /* broadcast address    */
 131 #define ifr_netmask     ifr_ifru.ifru_netmask   /* interface net mask   */
 132 #define ifr_flags       ifr_ifru.ifru_flags     /* flags                */
 133 #define ifr_metric      ifr_ifru.ifru_ivalue    /* metric               */
 134 #define ifr_mtu         ifr_ifru.ifru_mtu       /* mtu                  */
 135 #define ifr_map         ifr_ifru.ifru_map       /* device map           */
 136 #define ifr_slave       ifr_ifru.ifru_slave     /* slave device         */
 137 #define ifr_data        ifr_ifru.ifru_data      /* for use by interface */
 138 #define ifr_ifindex     ifr_ifru.ifru_ivalue    /* interface index      */
 139 #define ifr_bandwidth   ifr_ifru.ifru_ivalue    /* link bandwidth       */
 140 #define ifr_qlen        ifr_ifru.ifru_ivalue    /* Queue length         */
 141 #define ifr_newname     ifr_ifru.ifru_newname   /* New name             */
 142
 143 /*
 144  * Structure used in SIOCGIFCONF request.
 145  * Used to retrieve interface configuration
 146  * for machine (useful for programs which
 147  * must know all networks accessible).
 148  */
 149
 150 struct ifconf
 151 {
 152         int     ifc_len;                        /* size of buffer       */
 153         union
 154         {
 155                 char *                  ifcu_buf;
 156                 struct  ifreq           *ifcu_req;
 157         } ifc_ifcu;
 158 };
 159 #define ifc_buf ifc_ifcu.ifcu_buf               /* buffer address       */
 160 #define ifc_req ifc_ifcu.ifcu_req               /* array of structures  */
 161
 162
 163 #endif /* _LINUX_IF_H */