2 Unix SMB/CIFS implementation.
3 return a list of network interfaces
4 Copyright (C) Andrew Tridgell 1998
5 Copyright (C) Jeremy Allison 2007
6 Copyright (C) Jelmer Vernooij 2007
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "system/network.h"
25 #include "interfaces.h"
26 #include "lib/util/tsort.h"
27 #include "librpc/gen_ndr/ioctl.h"
30 #include "linux/sockios.h"
31 #include "linux/ethtool.h"
34 /****************************************************************************
35 Create a struct sockaddr_storage with the netmask bits set to 1.
36 ****************************************************************************/
38 bool make_netmask(struct sockaddr_storage *pss_out,
39 const struct sockaddr_storage *pss_in,
40 unsigned long masklen)
43 /* Now apply masklen bits of mask. */
44 #if defined(HAVE_IPV6)
45 if (pss_in->ss_family == AF_INET6) {
46 char *p = (char *)&((struct sockaddr_in6 *)pss_out)->sin6_addr;
52 for (i = 0; masklen >= 8; masklen -= 8, i++) {
55 /* Deal with the partial byte. */
56 *p++ &= (0xff & ~(0xff>>masklen));
58 for (;i < sizeof(struct in6_addr); i++) {
64 if (pss_in->ss_family == AF_INET) {
68 ((struct sockaddr_in *)pss_out)->sin_addr.s_addr =
69 htonl(((0xFFFFFFFFL >> masklen) ^ 0xFFFFFFFFL));
75 /****************************************************************************
76 Create a struct sockaddr_storage set to the broadcast or network adress from
77 an incoming sockaddr_storage.
78 ****************************************************************************/
80 static void make_bcast_or_net(struct sockaddr_storage *pss_out,
81 const struct sockaddr_storage *pss_in,
82 const struct sockaddr_storage *nmask,
85 unsigned int i = 0, len = 0;
86 const char *pmask = NULL;
90 /* Set all zero netmask bits to 1. */
91 #if defined(HAVE_IPV6)
92 if (pss_in->ss_family == AF_INET6) {
93 p = (char *)&((struct sockaddr_in6 *)pss_out)->sin6_addr;
94 pmask = (const char *)&((const struct sockaddr_in6 *)nmask)->sin6_addr;
98 if (pss_in->ss_family == AF_INET) {
99 p = (char *)&((struct sockaddr_in *)pss_out)->sin_addr;
100 pmask = (const char *)&((const struct sockaddr_in *)nmask)->sin_addr;
104 for (i = 0; i < len; i++, p++, pmask++) {
106 *p = (*p & *pmask) | (*pmask ^ 0xff);
114 void make_bcast(struct sockaddr_storage *pss_out,
115 const struct sockaddr_storage *pss_in,
116 const struct sockaddr_storage *nmask)
118 make_bcast_or_net(pss_out, pss_in, nmask, true);
121 void make_net(struct sockaddr_storage *pss_out,
122 const struct sockaddr_storage *pss_in,
123 const struct sockaddr_storage *nmask)
125 make_bcast_or_net(pss_out, pss_in, nmask, false);
129 static void query_iface_speed_from_name(const char *name, uint64_t *speed)
132 struct ethtool_cmd ecmd;
133 struct ethtool_value edata;
137 fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
139 DBG_ERR("Failed to open socket.");
143 strncpy(ifr.ifr_name, name, IF_NAMESIZE);
145 ifr.ifr_data = (void *)&edata;
146 edata.cmd = ETHTOOL_GLINK;
147 ret = ioctl(fd, SIOCETHTOOL, &ifr);
151 if (edata.data == 0) {
152 /* no link detected */
157 ifr.ifr_data = (void *)&ecmd;
158 ecmd.cmd = ETHTOOL_GSET;
159 ret = ioctl(fd, SIOCETHTOOL, &ifr);
163 *speed = ((uint64_t)ethtool_cmd_speed(&ecmd)) * 1000 * 1000;
170 /****************************************************************************
171 Try the "standard" getifaddrs/freeifaddrs interfaces.
172 Also gets IPv6 interfaces.
173 ****************************************************************************/
175 /****************************************************************************
176 Get the netmask address for a local interface.
177 ****************************************************************************/
179 static int _get_interfaces(TALLOC_CTX *mem_ctx, struct iface_struct **pifaces)
181 struct iface_struct *ifaces;
182 struct ifaddrs *iflist = NULL;
183 struct ifaddrs *ifptr = NULL;
187 uint64_t if_speed = 1000 * 1000 * 1000; /* 1GBit */
189 if (getifaddrs(&iflist) < 0) {
194 for (ifptr = iflist; ifptr != NULL; ifptr = ifptr->ifa_next) {
195 if (!ifptr->ifa_addr || !ifptr->ifa_netmask) {
198 if (!(ifptr->ifa_flags & IFF_UP)) {
204 ifaces = talloc_array(mem_ctx, struct iface_struct, count);
205 if (ifaces == NULL) {
210 /* Loop through interfaces, looking for given IP address */
211 for (ifptr = iflist; ifptr != NULL; ifptr = ifptr->ifa_next) {
213 if (!ifptr->ifa_addr || !ifptr->ifa_netmask) {
217 /* Check the interface is up. */
218 if (!(ifptr->ifa_flags & IFF_UP)) {
222 memset(&ifaces[total], '\0', sizeof(ifaces[total]));
224 copy_size = sizeof(struct sockaddr_in);
226 ifaces[total].flags = ifptr->ifa_flags;
228 #if defined(HAVE_IPV6)
229 if (ifptr->ifa_addr->sa_family == AF_INET6) {
230 copy_size = sizeof(struct sockaddr_in6);
234 memcpy(&ifaces[total].ip, ifptr->ifa_addr, copy_size);
235 memcpy(&ifaces[total].netmask, ifptr->ifa_netmask, copy_size);
237 /* calculate broadcast address */
238 #if defined(HAVE_IPV6)
239 if (ifptr->ifa_addr->sa_family == AF_INET6) {
240 struct sockaddr_in6 *sin6 =
241 (struct sockaddr_in6 *)ifptr->ifa_addr;
242 struct in6_addr *in6 =
243 (struct in6_addr *)&sin6->sin6_addr;
245 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_V4COMPAT(in6)) {
248 /* IPv6 does not have broadcast it uses multicast. */
249 memset(&ifaces[total].bcast, '\0', copy_size);
252 if (ifaces[total].flags & (IFF_BROADCAST|IFF_LOOPBACK)) {
253 make_bcast(&ifaces[total].bcast,
255 &ifaces[total].netmask);
256 } else if ((ifaces[total].flags & IFF_POINTOPOINT) &&
257 ifptr->ifa_dstaddr ) {
258 memcpy(&ifaces[total].bcast,
265 ifaces[total].if_index = if_nametoindex(ifptr->ifa_name);
266 if (ifaces[total].if_index == 0) {
267 DBG_ERR("Failed to retrieve interface index for '%s': "
268 "%s\n", ifptr->ifa_name, strerror(errno));
272 query_iface_speed_from_name(ifptr->ifa_name, &if_speed);
274 ifaces[total].linkspeed = if_speed;
275 ifaces[total].capability = FSCTL_NET_IFACE_NONE_CAPABLE;
277 if (strlcpy(ifaces[total].name, ifptr->ifa_name,
278 sizeof(ifaces[total].name)) >=
279 sizeof(ifaces[total].name)) {
280 /* Truncation ! Ignore. */
292 static int iface_comp(struct iface_struct *i1, struct iface_struct *i2)
296 #if defined(HAVE_IPV6)
298 * If we have IPv6 - sort these interfaces lower
299 * than any IPv4 ones.
301 if (i1->ip.ss_family == AF_INET6 &&
302 i2->ip.ss_family == AF_INET) {
304 } else if (i1->ip.ss_family == AF_INET &&
305 i2->ip.ss_family == AF_INET6) {
309 if (i1->ip.ss_family == AF_INET6) {
310 struct sockaddr_in6 *s1 = (struct sockaddr_in6 *)&i1->ip;
311 struct sockaddr_in6 *s2 = (struct sockaddr_in6 *)&i2->ip;
313 r = memcmp(&s1->sin6_addr,
315 sizeof(struct in6_addr));
320 s1 = (struct sockaddr_in6 *)&i1->netmask;
321 s2 = (struct sockaddr_in6 *)&i2->netmask;
323 r = memcmp(&s1->sin6_addr,
325 sizeof(struct in6_addr));
332 /* AIX uses __ss_family instead of ss_family inside of
333 sockaddr_storage. Instead of trying to figure out which field to
334 use, we can just cast it to a sockaddr.
337 if (((struct sockaddr *)&i1->ip)->sa_family == AF_INET) {
338 struct sockaddr_in *s1 = (struct sockaddr_in *)&i1->ip;
339 struct sockaddr_in *s2 = (struct sockaddr_in *)&i2->ip;
341 r = ntohl(s1->sin_addr.s_addr) -
342 ntohl(s2->sin_addr.s_addr);
347 s1 = (struct sockaddr_in *)&i1->netmask;
348 s2 = (struct sockaddr_in *)&i2->netmask;
350 return ntohl(s1->sin_addr.s_addr) -
351 ntohl(s2->sin_addr.s_addr);
356 /* this wrapper is used to remove duplicates from the interface list generated
358 int get_interfaces(TALLOC_CTX *mem_ctx, struct iface_struct **pifaces)
360 struct iface_struct *ifaces;
363 total = _get_interfaces(mem_ctx, &ifaces);
364 if (total <= 0) return total;
366 /* now we need to remove duplicates */
367 TYPESAFE_QSORT(ifaces, total, iface_comp);
370 if (iface_comp(&ifaces[i-1], &ifaces[i]) == 0) {
371 for (j=i-1;j<total-1;j++) {
372 ifaces[j] = ifaces[j+1];