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 struct udevice *udev_device_init(struct udevice *udev)
40 udev = malloc(sizeof(struct udevice));
43 memset(udev, 0x00, sizeof(struct udevice));
45 INIT_LIST_HEAD(&udev->symlink_list);
46 INIT_LIST_HEAD(&udev->run_list);
47 INIT_LIST_HEAD(&udev->env_list);
49 /* set sysfs device to local storage, can be overridden if needed */
50 udev->dev = &udev->dev_local;
52 /* default node permissions */
54 strcpy(udev->owner, "root");
55 strcpy(udev->group, "root");
57 udev->event_timeout = -1;
62 void udev_device_cleanup(struct udevice *udev)
64 name_list_cleanup(&udev->symlink_list);
65 name_list_cleanup(&udev->run_list);
66 name_list_cleanup(&udev->env_list);
70 dev_t udev_device_get_devt(struct udevice *udev)
73 unsigned int maj, min;
75 /* read it from sysfs */
76 attr = sysfs_attr_get_value(udev->dev->devpath, "dev");
78 if (sscanf(attr, "%u:%u", &maj, &min) == 2)
79 return makedev(maj, min);
84 static void kernel_log(struct ifreq ifr)
89 klog = open("/dev/kmsg", O_WRONLY);
93 f = fdopen(klog, "w");
99 fprintf(f, "<6>udev: renamed network interface %s to %s\n",
100 ifr.ifr_name, ifr.ifr_newname);
104 static int rename_netif(struct udevice *udev)
110 info("changing net interface name from '%s' to '%s'\n", udev->dev->kernel, udev->name);
114 sk = socket(PF_INET, SOCK_DGRAM, 0);
116 err("error opening socket: %s\n", strerror(errno));
120 memset(&ifr, 0x00, sizeof(struct ifreq));
121 strlcpy(ifr.ifr_name, udev->dev->kernel, IFNAMSIZ);
122 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
123 retval = ioctl(sk, SIOCSIFNAME, &ifr);
129 /* see if the destination interface name already exists */
130 if (errno != EEXIST) {
131 err("error changing netif name %s to %s: %s\n", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
135 /* free our own name, another process may wait for us */
136 strlcpy(ifr.ifr_newname, udev->dev->kernel, IFNAMSIZ);
137 strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
138 retval = ioctl(sk, SIOCSIFNAME, &ifr);
140 err("error changing netif name %s to %s: %s\n", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
144 /* wait 30 seconds for our target to become available */
145 strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
146 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
149 retval = ioctl(sk, SIOCSIFNAME, &ifr);
155 if (errno != EEXIST) {
156 err("error changing net interface name %s to %s: %s\n",
157 ifr.ifr_name, ifr.ifr_newname, strerror(errno));
160 dbg("wait for netif '%s' to become free, loop=%i\n", udev->name, (30 * 20) - loop);
161 usleep(1000 * 1000 / 20);
170 int udev_device_event(struct udev_rules *rules, struct udevice *udev)
174 if (udev->devpath_old != NULL)
175 if (udev_db_rename(udev->devpath_old, udev->dev->devpath) == 0)
176 info("moved database from '%s' to '%s'\n", udev->devpath_old, udev->dev->devpath);
178 /* add device node */
179 if (major(udev->devt) != 0 &&
180 (strcmp(udev->action, "add") == 0 || strcmp(udev->action, "change") == 0)) {
181 struct udevice *udev_old;
183 dbg("device node add '%s'\n", udev->dev->devpath);
185 udev_rules_get_name(rules, udev);
186 if (udev->ignore_device) {
187 info("device event will be ignored\n");
190 if (udev->name[0] == '\0') {
191 info("device node creation supressed\n");
195 /* read current database entry; cleanup, if it is known device */
196 udev_old = udev_device_init(NULL);
197 if (udev_old != NULL) {
198 udev_old->test_run = udev->test_run;
199 if (udev_db_get_device(udev_old, udev->dev->devpath) == 0) {
200 info("device '%s' already in database, cleanup\n", udev->dev->devpath);
201 udev_db_delete_device(udev_old);
203 udev_device_cleanup(udev_old);
209 retval = udev_node_add(udev);
213 /* store in database */
214 udev_db_add_device(udev);
216 /* create, replace, delete symlinks according to priority */
217 udev_node_update_symlinks(udev, udev_old);
219 if (udev_old != NULL)
220 udev_device_cleanup(udev_old);
225 if (strcmp(udev->dev->subsystem, "net") == 0 && strcmp(udev->action, "add") == 0) {
226 dbg("netif add '%s'\n", udev->dev->devpath);
227 udev_rules_get_name(rules, udev);
228 if (udev->ignore_device) {
229 info("device event will be ignored\n");
232 if (udev->name[0] == '\0') {
233 info("device renaming supressed\n");
237 /* look if we want to change the name of the netif */
238 if (strcmp(udev->name, udev->dev->kernel) != 0) {
239 char devpath[PATH_MAX];
242 retval = rename_netif(udev);
245 info("renamed netif to '%s'\n", udev->name);
247 /* export old name */
248 setenv("INTERFACE_OLD", udev->dev->kernel, 1);
250 /* now change the devpath, because the kernel device name has changed */
251 strlcpy(devpath, udev->dev->devpath, sizeof(devpath));
252 pos = strrchr(devpath, '/');
255 strlcat(devpath, udev->name, sizeof(devpath));
256 sysfs_device_set_values(udev->dev, devpath, NULL, NULL);
257 setenv("DEVPATH", udev->dev->devpath, 1);
258 setenv("INTERFACE", udev->name, 1);
259 info("changed devpath to '%s'\n", udev->dev->devpath);
265 /* remove device node */
266 if (major(udev->devt) != 0 && strcmp(udev->action, "remove") == 0) {
267 struct name_entry *name_loop;
269 /* import database entry, and delete it */
270 if (udev_db_get_device(udev, udev->dev->devpath) == 0) {
271 udev_db_delete_device(udev);
272 /* restore stored persistent data */
273 list_for_each_entry(name_loop, &udev->env_list, node)
274 putenv(name_loop->name);
276 dbg("'%s' not found in database, using kernel name '%s'\n",
277 udev->dev->devpath, udev->dev->kernel);
278 strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
281 udev_rules_get_run(rules, udev);
282 if (udev->ignore_device) {
283 info("device event will be ignored\n");
287 if (udev->ignore_remove) {
288 info("ignore_remove for '%s'\n", udev->name);
291 /* remove the node */
292 retval = udev_node_remove(udev);
294 /* delete or restore symlinks according to priority */
295 udev_node_update_symlinks(udev, NULL);
299 /* default devices */
300 udev_rules_get_run(rules, udev);
301 if (udev->ignore_device)
302 info("device event will be ignored\n");