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git.proxmox.com Git - mirror_frr.git/blob - zebra/if_ioctl.c
2 * Interface looking up by ioctl ().
3 * Copyright (C) 1997, 98 Kunihiro Ishiguro
5 * This file is part of GNU Zebra.
7 * GNU Zebra is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2, or (at your option) any
12 * GNU Zebra is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; see the file COPYING; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "sockunion.h"
30 #include "connected.h"
32 #include "zebra_memory.h"
36 #include "lib_errors.h"
38 #include "zebra/interface.h"
39 #include "zebra/rib.h"
41 #include "zebra/zebra_errors.h"
45 /* Interface looking up using infamous SIOCGIFCONF. */
46 static int interface_list_ioctl(void)
54 struct interface
*ifp
;
58 /* Normally SIOCGIFCONF works with AF_INET socket. */
59 sock
= socket(AF_INET
, SOCK_DGRAM
, 0);
61 flog_err_sys(EC_LIB_SOCKET
,
62 "Can't make AF_INET socket stream: %s",
63 safe_strerror(errno
));
67 /* Set initial ifreq count. This will be double when SIOCGIFCONF
68 fail. Solaris has SIOCGIFNUM. */
70 ret
= ioctl(sock
, SIOCGIFNUM
, &ifnum
);
77 #endif /* SIOCGIFNUM */
79 ifconf
.ifc_buf
= NULL
;
82 /* Loop until SIOCGIFCONF success. */
84 ifconf
.ifc_len
= sizeof(struct ifreq
) * ifnum
;
86 XREALLOC(MTYPE_TMP
, ifconf
.ifc_buf
, ifconf
.ifc_len
);
88 ret
= ioctl(sock
, SIOCGIFCONF
, &ifconf
);
91 flog_err_sys(EC_LIB_SYSTEM_CALL
, "SIOCGIFCONF: %s",
92 safe_strerror(errno
));
95 /* Repeatedly get info til buffer fails to grow. */
96 if (ifconf
.ifc_len
> lastlen
) {
97 lastlen
= ifconf
.ifc_len
;
105 /* Allocate interface. */
106 ifreq
= ifconf
.ifc_req
;
109 for (n
= 0; n
< ifconf
.ifc_len
;) {
112 ifreq
= (struct ifreq
*)((caddr_t
)ifconf
.ifc_req
+ n
);
113 ifp
= if_get_by_name(ifreq
->ifr_name
, VRF_DEFAULT
);
115 size
= ifreq
->ifr_addr
.sa_len
;
116 if (size
< sizeof(ifreq
->ifr_addr
))
117 size
= sizeof(ifreq
->ifr_addr
);
118 size
+= sizeof(ifreq
->ifr_name
);
122 for (n
= 0; n
< ifconf
.ifc_len
; n
+= sizeof(struct ifreq
)) {
123 ifp
= if_get_by_name(ifreq
->ifr_name
, VRF_DEFAULT
);
127 #endif /* OPEN_BSD */
131 XFREE(MTYPE_TMP
, ifconf
.ifc_buf
);
136 /* Get interface's index by ioctl. */
137 static int if_get_index(struct interface
*ifp
)
139 if_set_index(ifp
, if_nametoindex(ifp
->name
));
144 static int if_get_hwaddr(struct interface
*ifp
)
150 strncpy(ifreq
.ifr_name
, ifp
->name
, IFNAMSIZ
);
151 ifreq
.ifr_addr
.sa_family
= AF_INET
;
153 /* Fetch Hardware address if available. */
154 ret
= vrf_if_ioctl(SIOCGIFHWADDR
, (caddr_t
)&ifreq
, ifp
->vrf_id
);
156 ifp
->hw_addr_len
= 0;
158 memcpy(ifp
->hw_addr
, ifreq
.ifr_hwaddr
.sa_data
, 6);
160 for (i
= 0; i
< 6; i
++)
161 if (ifp
->hw_addr
[i
] != 0)
165 ifp
->hw_addr_len
= 0;
167 ifp
->hw_addr_len
= 6;
171 #endif /* SIOCGIFHWADDR */
173 static int if_getaddrs(void)
176 struct ifaddrs
*ifap
;
177 struct ifaddrs
*ifapfree
;
178 struct interface
*ifp
;
181 ret
= getifaddrs(&ifap
);
183 flog_err_sys(EC_LIB_SYSTEM_CALL
, "getifaddrs(): %s",
184 safe_strerror(errno
));
188 for (ifapfree
= ifap
; ifap
; ifap
= ifap
->ifa_next
) {
189 if (ifap
->ifa_addr
== NULL
) {
192 "%s: nonsensical ifaddr with NULL ifa_addr, ifname %s",
194 (ifap
->ifa_name
? ifap
->ifa_name
: "(null)"));
198 ifp
= if_lookup_by_name(ifap
->ifa_name
, VRF_DEFAULT
);
200 flog_err(EC_LIB_INTERFACE
,
201 "if_getaddrs(): Can't lookup interface %s\n",
206 if (ifap
->ifa_addr
->sa_family
== AF_INET
) {
207 struct sockaddr_in
*addr
;
208 struct sockaddr_in
*mask
;
209 struct sockaddr_in
*dest
;
210 struct in_addr
*dest_pnt
;
213 addr
= (struct sockaddr_in
*)ifap
->ifa_addr
;
214 mask
= (struct sockaddr_in
*)ifap
->ifa_netmask
;
215 prefixlen
= ip_masklen(mask
->sin_addr
);
219 if (if_is_pointopoint(ifp
) && ifap
->ifa_dstaddr
220 && !IPV4_ADDR_SAME(&addr
->sin_addr
,
221 &((struct sockaddr_in
*)
224 dest
= (struct sockaddr_in
*)ifap
->ifa_dstaddr
;
225 dest_pnt
= &dest
->sin_addr
;
226 flags
= ZEBRA_IFA_PEER
;
227 } else if (ifap
->ifa_broadaddr
230 &((struct sockaddr_in
*)
233 dest
= (struct sockaddr_in
*)
235 dest_pnt
= &dest
->sin_addr
;
238 connected_add_ipv4(ifp
, flags
, &addr
->sin_addr
,
239 prefixlen
, dest_pnt
, NULL
,
242 if (ifap
->ifa_addr
->sa_family
== AF_INET6
) {
243 struct sockaddr_in6
*addr
;
244 struct sockaddr_in6
*mask
;
247 addr
= (struct sockaddr_in6
*)ifap
->ifa_addr
;
248 mask
= (struct sockaddr_in6
*)ifap
->ifa_netmask
;
249 prefixlen
= ip6_masklen(mask
->sin6_addr
);
252 if (IN6_IS_ADDR_LINKLOCAL(&addr
->sin6_addr
)) {
253 addr
->sin6_scope_id
=
254 ntohs(*(uint16_t *)&addr
->sin6_addr
256 addr
->sin6_addr
.s6_addr
[2] =
257 addr
->sin6_addr
.s6_addr
[3] = 0;
261 connected_add_ipv6(ifp
, flags
, &addr
->sin6_addr
, NULL
,
262 prefixlen
, NULL
, METRIC_MAX
);
266 freeifaddrs(ifapfree
);
271 /* Fetch interface information via ioctl(). */
272 static void interface_info_ioctl()
274 struct vrf
*vrf
= vrf_lookup_by_id(VRF_DEFAULT
);
275 struct interface
*ifp
;
277 FOR_ALL_INTERFACES (vrf
, ifp
) {
281 #endif /* SIOCGIFHWADDR */
288 /* Lookup all interface information. */
289 void interface_list(struct zebra_ns
*zns
)
292 zlog_info("interface_list: NS %u", zns
->ns_id
);
294 /* Linux can do both proc & ioctl, ioctl is the only way to get
295 interface aliases in 2.2 series kernels. */
296 #ifdef HAVE_PROC_NET_DEV
297 interface_list_proc();
298 #endif /* HAVE_PROC_NET_DEV */
299 interface_list_ioctl();
301 /* After listing is done, get index, address, flags and other
302 interface's information. */
303 interface_info_ioctl();
307 #if defined(HAVE_PROC_NET_IF_INET6)
308 /* Linux provides interface's IPv6 address via
309 /proc/net/if_inet6. */
311 #endif /* HAVE_PROC_NET_IF_INET6 */
314 #endif /* OPEN_BSD */