1 /* net/if.h -- declarations for inquiring about network interfaces
2 Copyright (C) 1997,98,99,2000,2001,2012 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
26 # include <sys/types.h>
27 # include <sys/socket.h>
31 /* Length of interface name. */
32 #define IF_NAMESIZE 16
36 unsigned int if_index; /* 1, 2, ... */
37 char *if_name; /* null terminated name: "eth0", ... */
42 /* Standard interface flags. */
45 IFF_UP = 0x1, /* Interface is up. */
46 # define IFF_UP IFF_UP
47 IFF_BROADCAST = 0x2, /* Broadcast address valid. */
48 # define IFF_BROADCAST IFF_BROADCAST
49 IFF_DEBUG = 0x4, /* Turn on debugging. */
50 # define IFF_DEBUG IFF_DEBUG
51 IFF_LOOPBACK = 0x8, /* Is a loopback net. */
52 # define IFF_LOOPBACK IFF_LOOPBACK
53 IFF_POINTOPOINT = 0x10, /* Interface is point-to-point link. */
54 # define IFF_POINTOPOINT IFF_POINTOPOINT
55 IFF_NOTRAILERS = 0x20, /* Avoid use of trailers. */
56 # define IFF_NOTRAILERS IFF_NOTRAILERS
57 IFF_RUNNING = 0x40, /* Resources allocated. */
58 # define IFF_RUNNING IFF_RUNNING
59 IFF_NOARP = 0x80, /* No address resolution protocol. */
60 # define IFF_NOARP IFF_NOARP
61 IFF_PROMISC = 0x100, /* Receive all packets. */
62 # define IFF_PROMISC IFF_PROMISC
65 IFF_ALLMULTI = 0x200, /* Receive all multicast packets. */
66 # define IFF_ALLMULTI IFF_ALLMULTI
68 IFF_MASTER = 0x400, /* Master of a load balancer. */
69 # define IFF_MASTER IFF_MASTER
70 IFF_SLAVE = 0x800, /* Slave of a load balancer. */
71 # define IFF_SLAVE IFF_SLAVE
73 IFF_MULTICAST = 0x1000, /* Supports multicast. */
74 # define IFF_MULTICAST IFF_MULTICAST
76 IFF_PORTSEL = 0x2000, /* Can set media type. */
77 # define IFF_PORTSEL IFF_PORTSEL
78 IFF_AUTOMEDIA = 0x4000, /* Auto media select active. */
79 # define IFF_AUTOMEDIA IFF_AUTOMEDIA
80 IFF_DYNAMIC = 0x8000 /* Dialup device with changing addresses. */
81 # define IFF_DYNAMIC IFF_DYNAMIC
84 /* The ifaddr structure contains information about one address of an
85 interface. They are maintained by the different address families,
86 are allocated and attached when an address is set, and are linked
87 together so all addresses for an interface can be located. */
91 struct sockaddr ifa_addr; /* Address of interface. */
94 struct sockaddr ifu_broadaddr;
95 struct sockaddr ifu_dstaddr;
97 struct iface *ifa_ifp; /* Back-pointer to interface. */
98 struct ifaddr *ifa_next; /* Next address for interface. */
101 # define ifa_broadaddr ifa_ifu.ifu_broadaddr /* broadcast address */
102 # define ifa_dstaddr ifa_ifu.ifu_dstaddr /* other end of link */
104 /* Device mapping structure. I'd just gone off and designed a
105 beautiful scheme using only loadable modules with arguments for
106 driver options and along come the PCMCIA people 8)
108 Ah well. The get() side of this is good for WDSETUP, and it'll be
109 handy for debugging things. The set side is fine for now and being
110 very small might be worth keeping for clean configuration. */
114 unsigned long int mem_start;
115 unsigned long int mem_end;
116 unsigned short int base_addr;
123 /* Interface request structure used for socket ioctl's. All interface
124 ioctl's must have parameter definitions which begin with ifr_name.
125 The remainder may be interface specific. */
129 # define IFHWADDRLEN 6
130 # define IFNAMSIZ IF_NAMESIZE
133 char ifrn_name[IFNAMSIZ]; /* Interface name, e.g. "en0". */
138 struct sockaddr ifru_addr;
139 struct sockaddr ifru_dstaddr;
140 struct sockaddr ifru_broadaddr;
141 struct sockaddr ifru_netmask;
142 struct sockaddr ifru_hwaddr;
143 short int ifru_flags;
146 struct ifmap ifru_map;
147 char ifru_slave[IFNAMSIZ]; /* Just fits the size */
148 char ifru_newname[IFNAMSIZ];
152 # define ifr_name ifr_ifrn.ifrn_name /* interface name */
153 # define ifr_hwaddr ifr_ifru.ifru_hwaddr /* MAC address */
154 # define ifr_addr ifr_ifru.ifru_addr /* address */
155 # define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-p lnk */
156 # define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */
157 # define ifr_netmask ifr_ifru.ifru_netmask /* interface net mask */
158 # define ifr_flags ifr_ifru.ifru_flags /* flags */
159 # define ifr_metric ifr_ifru.ifru_ivalue /* metric */
160 # define ifr_mtu ifr_ifru.ifru_mtu /* mtu */
161 # define ifr_map ifr_ifru.ifru_map /* device map */
162 # define ifr_slave ifr_ifru.ifru_slave /* slave device */
163 # define ifr_data ifr_ifru.ifru_data /* for use by interface */
164 # define ifr_ifindex ifr_ifru.ifru_ivalue /* interface index */
165 # define ifr_bandwidth ifr_ifru.ifru_ivalue /* link bandwidth */
166 # define ifr_qlen ifr_ifru.ifru_ivalue /* queue length */
167 # define ifr_newname ifr_ifru.ifru_newname /* New name */
168 # define _IOT_ifreq _IOT(_IOTS(char),IFNAMSIZ,_IOTS(char),16,0,0)
169 # define _IOT_ifreq_short _IOT(_IOTS(char),IFNAMSIZ,_IOTS(short),1,0,0)
170 # define _IOT_ifreq_int _IOT(_IOTS(char),IFNAMSIZ,_IOTS(int),1,0,0)
173 /* Structure used in SIOCGIFCONF request. Used to retrieve interface
174 configuration for machine (useful for programs which must know all
175 networks accessible). */
179 int ifc_len; /* Size of buffer. */
183 struct ifreq *ifcu_req;
186 # define ifc_buf ifc_ifcu.ifcu_buf /* Buffer address. */
187 # define ifc_req ifc_ifcu.ifcu_req /* Array of structures. */
188 # define _IOT_ifconf _IOT(_IOTS(struct ifconf),1,0,0,0,0) /* not right */
193 /* Convert an interface name to an index, and vice versa. */
194 extern unsigned int if_nametoindex (const char *__ifname) __THROW;
195 extern char *if_indextoname (unsigned int __ifindex, char *__ifname) __THROW;
197 /* Return a list of all interfaces and their indices. */
198 extern struct if_nameindex *if_nameindex (void) __THROW;
200 /* Free the data returned from if_nameindex. */
201 extern void if_freenameindex (struct if_nameindex *__ptr) __THROW;
205 #endif /* net/if.h */