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 "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 /* Not supported */
  36 #define IFF_ALLMULTI    0x200           /* receive all multicast packets*/
  37
  38 #define IFF_MASTER      0x400           /* master of a load balancer    */
  39 #define IFF_SLAVE       0x800           /* slave of a load balancer     */
  40
  41 #define IFF_MULTICAST   0x1000          /* Supports multicast           */
  42
  43 /*
  44  * The ifaddr structure contains information about one address
  45  * of an interface.  They are maintained by the different address
  46  * families, are allocated and attached when an address is set,
  47  * and are linked together so all addresses for an interface can
  48  * be located.
  49  */
  50
  51 struct ifaddr
  52 {
  53         struct sockaddr ifa_addr;       /* address of interface         */
  54         union {
  55                 struct sockaddr ifu_broadaddr;
  56                 struct sockaddr ifu_dstaddr;
  57         } ifa_ifu;
  58         struct iface            *ifa_ifp;       /* back-pointer to interface    */
  59         struct ifaddr           *ifa_next;      /* next address for interface   */
  60 };
  61
  62 #define ifa_broadaddr   ifa_ifu.ifu_broadaddr   /* broadcast address    */
  63 #define ifa_dstaddr     ifa_ifu.ifu_dstaddr     /* other end of link    */
  64
  65 /*
  66  *      Device mapping structure. I'd just gone off and designed a
  67  *      beautiful scheme using only loadable modules with arguments
  68  *      for driver options and along come the PCMCIA people 8)
  69  *
  70  *      Ah well. The get() side of this is good for WDSETUP, and it'll
  71  *      be handy for debugging things. The set side is fine for now and
  72  *      being very small might be worth keeping for clean configuration.
  73  */
  74
  75 struct ifmap
  76 {
  77         unsigned long mem_start;
  78         unsigned long mem_end;
  79         unsigned short base_addr;
  80         unsigned char irq;
  81         unsigned char dma;
  82         unsigned char port;
  83         /* 3 bytes spare */
  84 };
  85
  86 /*
  87  * Interface request structure used for socket
  88  * ioctl's.  All interface ioctl's must have parameter
  89  * definitions which begin with ifr_name.  The
  90  * remainder may be interface specific.
  91  */
  92
  93 struct ifreq
  94 {
  95 #define IFHWADDRLEN     6
  96 #define IFNAMSIZ        16
  97         union
  98         {
  99                 char    ifrn_name[IFNAMSIZ];            /* if name, e.g. "en0" */
 100         } ifr_ifrn;
 101
 102         union {
 103                 struct  sockaddr ifru_addr;
 104                 struct  sockaddr ifru_dstaddr;
 105                 struct  sockaddr ifru_broadaddr;
 106                 struct  sockaddr ifru_netmask;
 107                 struct  sockaddr ifru_hwaddr;
 108                 short   ifru_flags;
 109                 int     ifru_metric;
 110                 int     ifru_mtu;
 111                 struct  ifmap ifru_map;
 112                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 113                 caddr_t ifru_data;
 114         } ifr_ifru;
 115 };
 116
 117 #define ifr_name        ifr_ifrn.ifrn_name      /* interface name       */
 118 #define ifr_hwaddr      ifr_ifru.ifru_hwaddr    /* MAC address          */
 119 #define ifr_addr        ifr_ifru.ifru_addr      /* address              */
 120 #define ifr_dstaddr     ifr_ifru.ifru_dstaddr   /* other end of p-p lnk */
 121 #define ifr_broadaddr   ifr_ifru.ifru_broadaddr /* broadcast address    */
 122 #define ifr_netmask     ifr_ifru.ifru_netmask   /* interface net mask   */
 123 #define ifr_flags       ifr_ifru.ifru_flags     /* flags                */
 124 #define ifr_metric      ifr_ifru.ifru_metric    /* metric               */
 125 #define ifr_mtu         ifr_ifru.ifru_mtu       /* mtu                  */
 126 #define ifr_map         ifr_ifru.ifru_map       /* device map           */
 127 #define ifr_slave       ifr_ifru.ifru_slave     /* slave device         */
 128 #define ifr_data        ifr_ifru.ifru_data      /* for use by interface */
 129
 130 /*
 131  * Structure used in SIOCGIFCONF request.
 132  * Used to retrieve interface configuration
 133  * for machine (useful for programs which
 134  * must know all networks accessible).
 135  */
 136
 137 struct ifconf
 138 {
 139         int     ifc_len;                        /* size of buffer       */
 140         union
 141         {
 142                 caddr_t ifcu_buf;
 143                 struct  ifreq *ifcu_req;
 144         } ifc_ifcu;
 145 };
 146 #define ifc_buf ifc_ifcu.ifcu_buf               /* buffer address       */
 147 #define ifc_req ifc_ifcu.ifcu_req               /* array of structures  */
 148
 149 #endif /* _LINUX_IF_H */