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 if (strlen(name) >= IF_NAMESIZE) {
144 DBG_ERR("Interface name too long.");
148 strncpy(ifr.ifr_name, name, IF_NAMESIZE);
150 ifr.ifr_data = (void *)&edata;
151 edata.cmd = ETHTOOL_GLINK;
152 ret = ioctl(fd, SIOCETHTOOL, &ifr);
156 if (edata.data == 0) {
157 /* no link detected */
162 ifr.ifr_data = (void *)&ecmd;
163 ecmd.cmd = ETHTOOL_GSET;
164 ret = ioctl(fd, SIOCETHTOOL, &ifr);
168 *speed = ((uint64_t)ethtool_cmd_speed(&ecmd)) * 1000 * 1000;
175 /****************************************************************************
176 Try the "standard" getifaddrs/freeifaddrs interfaces.
177 Also gets IPv6 interfaces.
178 ****************************************************************************/
180 /****************************************************************************
181 Get the netmask address for a local interface.
182 ****************************************************************************/
184 static int _get_interfaces(TALLOC_CTX *mem_ctx, struct iface_struct **pifaces)
186 struct iface_struct *ifaces;
187 struct ifaddrs *iflist = NULL;
188 struct ifaddrs *ifptr = NULL;
192 uint64_t if_speed = 1000 * 1000 * 1000; /* 1GBit */
194 if (getifaddrs(&iflist) < 0) {
199 for (ifptr = iflist; ifptr != NULL; ifptr = ifptr->ifa_next) {
200 if (!ifptr->ifa_addr || !ifptr->ifa_netmask) {
203 if (!(ifptr->ifa_flags & IFF_UP)) {
209 ifaces = talloc_array(mem_ctx, struct iface_struct, count);
210 if (ifaces == NULL) {
215 /* Loop through interfaces, looking for given IP address */
216 for (ifptr = iflist; ifptr != NULL; ifptr = ifptr->ifa_next) {
218 if (!ifptr->ifa_addr || !ifptr->ifa_netmask) {
222 /* Check the interface is up. */
223 if (!(ifptr->ifa_flags & IFF_UP)) {
227 memset(&ifaces[total], '\0', sizeof(ifaces[total]));
229 copy_size = sizeof(struct sockaddr_in);
231 ifaces[total].flags = ifptr->ifa_flags;
233 #if defined(HAVE_IPV6)
234 if (ifptr->ifa_addr->sa_family == AF_INET6) {
235 copy_size = sizeof(struct sockaddr_in6);
239 memcpy(&ifaces[total].ip, ifptr->ifa_addr, copy_size);
240 memcpy(&ifaces[total].netmask, ifptr->ifa_netmask, copy_size);
242 /* calculate broadcast address */
243 #if defined(HAVE_IPV6)
244 if (ifptr->ifa_addr->sa_family == AF_INET6) {
245 struct sockaddr_in6 *sin6 =
246 (struct sockaddr_in6 *)ifptr->ifa_addr;
247 struct in6_addr *in6 =
248 (struct in6_addr *)&sin6->sin6_addr;
250 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_V4COMPAT(in6)) {
253 /* IPv6 does not have broadcast it uses multicast. */
254 memset(&ifaces[total].bcast, '\0', copy_size);
257 if (ifaces[total].flags & (IFF_BROADCAST|IFF_LOOPBACK)) {
258 make_bcast(&ifaces[total].bcast,
260 &ifaces[total].netmask);
261 } else if ((ifaces[total].flags & IFF_POINTOPOINT) &&
262 ifptr->ifa_dstaddr ) {
263 memcpy(&ifaces[total].bcast,
270 ifaces[total].if_index = if_nametoindex(ifptr->ifa_name);
271 if (ifaces[total].if_index == 0) {
272 DBG_ERR("Failed to retrieve interface index for '%s': "
273 "%s\n", ifptr->ifa_name, strerror(errno));
277 query_iface_speed_from_name(ifptr->ifa_name, &if_speed);
279 ifaces[total].linkspeed = if_speed;
280 ifaces[total].capability = FSCTL_NET_IFACE_NONE_CAPABLE;
282 if (strlcpy(ifaces[total].name, ifptr->ifa_name,
283 sizeof(ifaces[total].name)) >=
284 sizeof(ifaces[total].name)) {
285 /* Truncation ! Ignore. */
297 static int iface_comp(struct iface_struct *i1, struct iface_struct *i2)
301 #if defined(HAVE_IPV6)
303 * If we have IPv6 - sort these interfaces lower
304 * than any IPv4 ones.
306 if (i1->ip.ss_family == AF_INET6 &&
307 i2->ip.ss_family == AF_INET) {
309 } else if (i1->ip.ss_family == AF_INET &&
310 i2->ip.ss_family == AF_INET6) {
314 if (i1->ip.ss_family == AF_INET6) {
315 struct sockaddr_in6 *s1 = (struct sockaddr_in6 *)&i1->ip;
316 struct sockaddr_in6 *s2 = (struct sockaddr_in6 *)&i2->ip;
318 r = memcmp(&s1->sin6_addr,
320 sizeof(struct in6_addr));
325 s1 = (struct sockaddr_in6 *)&i1->netmask;
326 s2 = (struct sockaddr_in6 *)&i2->netmask;
328 r = memcmp(&s1->sin6_addr,
330 sizeof(struct in6_addr));
337 /* AIX uses __ss_family instead of ss_family inside of
338 sockaddr_storage. Instead of trying to figure out which field to
339 use, we can just cast it to a sockaddr.
342 if (((struct sockaddr *)&i1->ip)->sa_family == AF_INET) {
343 struct sockaddr_in *s1 = (struct sockaddr_in *)&i1->ip;
344 struct sockaddr_in *s2 = (struct sockaddr_in *)&i2->ip;
346 r = ntohl(s1->sin_addr.s_addr) -
347 ntohl(s2->sin_addr.s_addr);
352 s1 = (struct sockaddr_in *)&i1->netmask;
353 s2 = (struct sockaddr_in *)&i2->netmask;
355 return ntohl(s1->sin_addr.s_addr) -
356 ntohl(s2->sin_addr.s_addr);
361 /* this wrapper is used to remove duplicates from the interface list generated
363 int get_interfaces(TALLOC_CTX *mem_ctx, struct iface_struct **pifaces)
365 struct iface_struct *ifaces;
368 total = _get_interfaces(mem_ctx, &ifaces);
369 if (total <= 0) return total;
371 /* now we need to remove duplicates */
372 TYPESAFE_QSORT(ifaces, total, iface_comp);
375 if (iface_comp(&ifaces[i-1], &ifaces[i]) == 0) {
376 for (j=i-1;j<total-1;j++) {
377 ifaces[j] = ifaces[j+1];