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.
27 #include <sys/ioctl.h>
28 #include <sys/socket.h>
30 #include <linux/sockios.h>
33 #include "udev_rules.h"
36 struct udevice *udev_device_init(struct udevice *udev)
39 udev = malloc(sizeof(struct udevice));
42 memset(udev, 0x00, sizeof(struct udevice));
44 INIT_LIST_HEAD(&udev->symlink_list);
45 INIT_LIST_HEAD(&udev->run_list);
46 INIT_LIST_HEAD(&udev->env_list);
48 /* set sysfs device to local storage, can be overridden if needed */
49 udev->dev = &udev->dev_local;
51 /* default node permissions */
53 strcpy(udev->owner, "root");
54 strcpy(udev->group, "root");
59 void udev_device_cleanup(struct udevice *udev)
61 name_list_cleanup(&udev->symlink_list);
62 name_list_cleanup(&udev->run_list);
63 name_list_cleanup(&udev->env_list);
67 dev_t udev_device_get_devt(struct udevice *udev)
70 unsigned int maj, min;
72 /* read it from sysfs */
73 attr = sysfs_attr_get_value(udev->dev->devpath, "dev");
75 if (sscanf(attr, "%u:%u", &maj, &min) == 2)
76 return makedev(maj, min);
81 static void kernel_log(struct ifreq ifr)
86 klog = open("/dev/kmsg", O_WRONLY);
90 f = fdopen(klog, "w");
96 fprintf(f, "<6>udev: renamed network interface %s to %s\n",
97 ifr.ifr_name, ifr.ifr_newname);
101 static int rename_netif(struct udevice *udev)
107 info("changing net interface name from '%s' to '%s'", udev->dev->kernel, udev->name);
111 sk = socket(PF_INET, SOCK_DGRAM, 0);
113 err("error opening socket: %s", strerror(errno));
117 memset(&ifr, 0x00, sizeof(struct ifreq));
118 strlcpy(ifr.ifr_name, udev->dev->kernel, IFNAMSIZ);
119 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
120 retval = ioctl(sk, SIOCSIFNAME, &ifr);
126 /* see if the destination interface name already exists */
127 if (errno != EEXIST) {
128 err("error changing netif name %s to %s: %s", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
132 /* free our own name, another process may wait for us */
133 strlcpy(ifr.ifr_newname, udev->dev->kernel, IFNAMSIZ);
134 strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
135 retval = ioctl(sk, SIOCSIFNAME, &ifr);
137 err("error changing netif name %s to %s: %s", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
141 /* wait 30 seconds for our target to become available */
142 strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
143 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
146 retval = ioctl(sk, SIOCSIFNAME, &ifr);
152 if (errno != EEXIST) {
153 err("error changing net interface name %s to %s: %s",
154 ifr.ifr_name, ifr.ifr_newname, strerror(errno));
157 dbg("wait for netif '%s' to become free, loop=%i", udev->name, (30 * 20) - loop);
158 usleep(1000 * 1000 / 20);
167 int udev_device_event(struct udev_rules *rules, struct udevice *udev)
171 /* add device node */
172 if (major(udev->devt) != 0 &&
173 (strcmp(udev->action, "add") == 0 || strcmp(udev->action, "change") == 0)) {
174 struct udevice *udev_old;
176 dbg("device node add '%s'", udev->dev->devpath);
178 udev_rules_get_name(rules, udev);
179 if (udev->ignore_device) {
180 info("device event will be ignored");
183 if (udev->name[0] == '\0') {
184 info("device node creation supressed");
188 /* read current database entry; cleanup, if it is known device */
189 udev_old = udev_device_init(NULL);
190 if (udev_old != NULL) {
191 udev_old->test_run = udev->test_run;
192 if (udev_db_get_device(udev_old, udev->dev->devpath) == 0) {
193 info("device '%s' already in database, cleanup", udev->dev->devpath);
194 udev_db_delete_device(udev_old);
196 udev_device_cleanup(udev_old);
202 retval = udev_node_add(udev);
206 /* store in database */
207 udev_db_add_device(udev);
209 /* create, replace, delete symlinks according to priority */
210 udev_node_update_symlinks(udev, udev_old);
212 if (udev_old != NULL)
213 udev_device_cleanup(udev_old);
218 if (strcmp(udev->dev->subsystem, "net") == 0 && strcmp(udev->action, "add") == 0) {
219 dbg("netif add '%s'", udev->dev->devpath);
220 udev_rules_get_name(rules, udev);
221 if (udev->ignore_device) {
222 info("device event will be ignored");
225 if (udev->name[0] == '\0') {
226 info("device renaming supressed");
230 /* look if we want to change the name of the netif */
231 if (strcmp(udev->name, udev->dev->kernel) != 0) {
232 char devpath[PATH_MAX];
235 retval = rename_netif(udev);
238 info("renamed netif to '%s'", udev->name);
240 /* export old name */
241 setenv("INTERFACE_OLD", udev->dev->kernel, 1);
243 /* now change the devpath, because the kernel device name has changed */
244 strlcpy(devpath, udev->dev->devpath, sizeof(devpath));
245 pos = strrchr(devpath, '/');
248 strlcat(devpath, udev->name, sizeof(devpath));
249 sysfs_device_set_values(udev->dev, devpath, NULL, NULL);
250 setenv("DEVPATH", udev->dev->devpath, 1);
251 setenv("INTERFACE", udev->name, 1);
252 info("changed devpath to '%s'", udev->dev->devpath);
258 /* remove device node */
259 if (major(udev->devt) != 0 && strcmp(udev->action, "remove") == 0) {
260 struct name_entry *name_loop;
262 /* import database entry, and delete it */
263 if (udev_db_get_device(udev, udev->dev->devpath) == 0) {
264 udev_db_delete_device(udev);
265 if (udev->ignore_remove) {
266 info("ignore_remove for '%s'", udev->name);
269 /* restore stored persistent data */
270 list_for_each_entry(name_loop, &udev->env_list, node)
271 putenv(name_loop->name);
273 dbg("'%s' not found in database, using kernel name '%s'",
274 udev->dev->devpath, udev->dev->kernel);
275 strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
278 udev_rules_get_run(rules, udev);
279 if (udev->ignore_device) {
280 info("device event will be ignored");
284 /* remove the node */
285 retval = udev_node_remove(udev);
287 /* delete or restore symlinks according to priority */
288 udev_node_update_symlinks(udev, NULL);
292 /* default devices */
293 udev_rules_get_run(rules, udev);
294 if (udev->ignore_device)
295 info("device event will be ignored");