2 * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
31 #include <linux/sockios.h>
34 #include "udev_rules.h"
37 static void kernel_log(struct ifreq ifr)
42 klog = open("/dev/kmsg", O_WRONLY);
46 f = fdopen(klog, "w");
52 fprintf(f, "<6>udev: renamed network interface %s to %s\n",
53 ifr.ifr_name, ifr.ifr_newname);
57 static int rename_netif(struct udevice *udev)
63 info("changing net interface name from '%s' to '%s'\n", udev->dev->kernel, udev->name);
67 sk = socket(PF_INET, SOCK_DGRAM, 0);
69 err("error opening socket: %s\n", strerror(errno));
73 memset(&ifr, 0x00, sizeof(struct ifreq));
74 strlcpy(ifr.ifr_name, udev->dev->kernel, IFNAMSIZ);
75 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
76 retval = ioctl(sk, SIOCSIFNAME, &ifr);
82 /* see if the destination interface name already exists */
83 if (errno != EEXIST) {
84 err("error changing netif name %s to %s: %s\n", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
88 /* free our own name, another process may wait for us */
89 strlcpy(ifr.ifr_newname, udev->dev->kernel, IFNAMSIZ);
90 strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
91 retval = ioctl(sk, SIOCSIFNAME, &ifr);
93 err("error changing netif name %s to %s: %s\n", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
97 /* wait 30 seconds for our target to become available */
98 strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
99 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
102 retval = ioctl(sk, SIOCSIFNAME, &ifr);
108 if (errno != EEXIST) {
109 err("error changing net interface name %s to %s: %s\n",
110 ifr.ifr_name, ifr.ifr_newname, strerror(errno));
113 dbg("wait for netif '%s' to become free, loop=%i\n", udev->name, (30 * 20) - loop);
114 usleep(1000 * 1000 / 20);
123 int udev_device_event(struct udev_rules *rules, struct udevice *udev)
127 if (udev->devpath_old != NULL)
128 if (udev_db_rename(udev->devpath_old, udev->dev->devpath) == 0)
129 info("moved database from '%s' to '%s'\n", udev->devpath_old, udev->dev->devpath);
131 /* add device node */
132 if (major(udev->devt) != 0 &&
133 (strcmp(udev->action, "add") == 0 || strcmp(udev->action, "change") == 0)) {
134 struct udevice *udev_old;
136 dbg("device node add '%s'\n", udev->dev->devpath);
138 udev_rules_get_name(rules, udev);
139 if (udev->ignore_device) {
140 info("device event will be ignored\n");
143 if (udev->name[0] == '\0') {
144 info("device node creation supressed\n");
148 /* read current database entry; cleanup, if it is known device */
149 udev_old = udev_device_init();
150 if (udev_old != NULL) {
151 udev_old->test_run = udev->test_run;
152 if (udev_db_get_device(udev_old, udev->dev->devpath) == 0) {
153 info("device '%s' already in database, cleanup\n", udev->dev->devpath);
154 udev_db_delete_device(udev_old);
156 udev_device_cleanup(udev_old);
162 retval = udev_node_add(udev);
166 /* store in database */
167 udev_db_add_device(udev);
169 /* create, replace, delete symlinks according to priority */
170 udev_node_update_symlinks(udev, udev_old);
172 if (udev_old != NULL)
173 udev_device_cleanup(udev_old);
178 if (strcmp(udev->dev->subsystem, "net") == 0 && strcmp(udev->action, "add") == 0) {
179 dbg("netif add '%s'\n", udev->dev->devpath);
180 udev_rules_get_name(rules, udev);
181 if (udev->ignore_device) {
182 info("device event will be ignored\n");
185 if (udev->name[0] == '\0') {
186 info("device renaming supressed\n");
190 /* look if we want to change the name of the netif */
191 if (strcmp(udev->name, udev->dev->kernel) != 0) {
192 char devpath[PATH_MAX];
195 retval = rename_netif(udev);
198 info("renamed netif to '%s'\n", udev->name);
200 /* export old name */
201 setenv("INTERFACE_OLD", udev->dev->kernel, 1);
203 /* now change the devpath, because the kernel device name has changed */
204 strlcpy(devpath, udev->dev->devpath, sizeof(devpath));
205 pos = strrchr(devpath, '/');
208 strlcat(devpath, udev->name, sizeof(devpath));
209 sysfs_device_set_values(udev->dev, devpath, NULL, NULL);
210 setenv("DEVPATH", udev->dev->devpath, 1);
211 setenv("INTERFACE", udev->name, 1);
212 info("changed devpath to '%s'\n", udev->dev->devpath);
218 /* remove device node */
219 if (major(udev->devt) != 0 && strcmp(udev->action, "remove") == 0) {
220 struct name_entry *name_loop;
222 /* import database entry, and delete it */
223 if (udev_db_get_device(udev, udev->dev->devpath) == 0) {
224 udev_db_delete_device(udev);
225 /* restore stored persistent data */
226 list_for_each_entry(name_loop, &udev->env_list, node)
227 putenv(name_loop->name);
229 dbg("'%s' not found in database, using kernel name '%s'\n",
230 udev->dev->devpath, udev->dev->kernel);
231 strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
234 udev_rules_get_run(rules, udev);
235 if (udev->ignore_device) {
236 info("device event will be ignored\n");
240 if (udev->ignore_remove) {
241 info("ignore_remove for '%s'\n", udev->name);
244 /* remove the node */
245 retval = udev_node_remove(udev);
247 /* delete or restore symlinks according to priority */
248 udev_node_update_symlinks(udev, NULL);
252 /* default devices */
253 udev_rules_get_run(rules, udev);
254 if (udev->ignore_device)
255 info("device event will be ignored\n");