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");
56 udev->event_timeout = -1;
61 void udev_device_cleanup(struct udevice *udev)
63 name_list_cleanup(&udev->symlink_list);
64 name_list_cleanup(&udev->run_list);
65 name_list_cleanup(&udev->env_list);
69 dev_t udev_device_get_devt(struct udevice *udev)
72 unsigned int maj, min;
74 /* read it from sysfs */
75 attr = sysfs_attr_get_value(udev->dev->devpath, "dev");
77 if (sscanf(attr, "%u:%u", &maj, &min) == 2)
78 return makedev(maj, min);
83 static void kernel_log(struct ifreq ifr)
88 klog = open("/dev/kmsg", O_WRONLY);
92 f = fdopen(klog, "w");
98 fprintf(f, "<6>udev: renamed network interface %s to %s\n",
99 ifr.ifr_name, ifr.ifr_newname);
103 static int rename_netif(struct udevice *udev)
109 info("changing net interface name from '%s' to '%s'\n", udev->dev->kernel, udev->name);
113 sk = socket(PF_INET, SOCK_DGRAM, 0);
115 err("error opening socket: %s\n", strerror(errno));
119 memset(&ifr, 0x00, sizeof(struct ifreq));
120 strlcpy(ifr.ifr_name, udev->dev->kernel, IFNAMSIZ);
121 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
122 retval = ioctl(sk, SIOCSIFNAME, &ifr);
128 /* see if the destination interface name already exists */
129 if (errno != EEXIST) {
130 err("error changing netif name %s to %s: %s\n", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
134 /* free our own name, another process may wait for us */
135 strlcpy(ifr.ifr_newname, udev->dev->kernel, IFNAMSIZ);
136 strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
137 retval = ioctl(sk, SIOCSIFNAME, &ifr);
139 err("error changing netif name %s to %s: %s\n", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
143 /* wait 30 seconds for our target to become available */
144 strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
145 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
148 retval = ioctl(sk, SIOCSIFNAME, &ifr);
154 if (errno != EEXIST) {
155 err("error changing net interface name %s to %s: %s\n",
156 ifr.ifr_name, ifr.ifr_newname, strerror(errno));
159 dbg("wait for netif '%s' to become free, loop=%i\n", udev->name, (30 * 20) - loop);
160 usleep(1000 * 1000 / 20);
169 int udev_device_event(struct udev_rules *rules, struct udevice *udev)
173 if (udev->devpath_old != NULL)
174 if (udev_db_rename(udev->devpath_old, udev->dev->devpath) == 0)
175 info("moved database from '%s' to '%s'\n", udev->devpath_old, udev->dev->devpath);
177 /* add device node */
178 if (major(udev->devt) != 0 &&
179 (strcmp(udev->action, "add") == 0 || strcmp(udev->action, "change") == 0)) {
180 struct udevice *udev_old;
182 dbg("device node add '%s'\n", udev->dev->devpath);
184 udev_rules_get_name(rules, udev);
185 if (udev->ignore_device) {
186 info("device event will be ignored\n");
189 if (udev->name[0] == '\0') {
190 info("device node creation supressed\n");
194 /* read current database entry; cleanup, if it is known device */
195 udev_old = udev_device_init(NULL);
196 if (udev_old != NULL) {
197 udev_old->test_run = udev->test_run;
198 if (udev_db_get_device(udev_old, udev->dev->devpath) == 0) {
199 info("device '%s' already in database, cleanup\n", udev->dev->devpath);
200 udev_db_delete_device(udev_old);
202 udev_device_cleanup(udev_old);
208 retval = udev_node_add(udev);
212 /* store in database */
213 udev_db_add_device(udev);
215 /* create, replace, delete symlinks according to priority */
216 udev_node_update_symlinks(udev, udev_old);
218 if (udev_old != NULL)
219 udev_device_cleanup(udev_old);
224 if (strcmp(udev->dev->subsystem, "net") == 0 && strcmp(udev->action, "add") == 0) {
225 dbg("netif add '%s'\n", udev->dev->devpath);
226 udev_rules_get_name(rules, udev);
227 if (udev->ignore_device) {
228 info("device event will be ignored\n");
231 if (udev->name[0] == '\0') {
232 info("device renaming supressed\n");
236 /* look if we want to change the name of the netif */
237 if (strcmp(udev->name, udev->dev->kernel) != 0) {
238 char devpath[PATH_MAX];
241 retval = rename_netif(udev);
244 info("renamed netif to '%s'\n", udev->name);
246 /* export old name */
247 setenv("INTERFACE_OLD", udev->dev->kernel, 1);
249 /* now change the devpath, because the kernel device name has changed */
250 strlcpy(devpath, udev->dev->devpath, sizeof(devpath));
251 pos = strrchr(devpath, '/');
254 strlcat(devpath, udev->name, sizeof(devpath));
255 sysfs_device_set_values(udev->dev, devpath, NULL, NULL);
256 setenv("DEVPATH", udev->dev->devpath, 1);
257 setenv("INTERFACE", udev->name, 1);
258 info("changed devpath to '%s'\n", udev->dev->devpath);
264 /* remove device node */
265 if (major(udev->devt) != 0 && strcmp(udev->action, "remove") == 0) {
266 struct name_entry *name_loop;
268 /* import database entry, and delete it */
269 if (udev_db_get_device(udev, udev->dev->devpath) == 0) {
270 udev_db_delete_device(udev);
271 /* restore stored persistent data */
272 list_for_each_entry(name_loop, &udev->env_list, node)
273 putenv(name_loop->name);
275 dbg("'%s' not found in database, using kernel name '%s'\n",
276 udev->dev->devpath, udev->dev->kernel);
277 strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
280 udev_rules_get_run(rules, udev);
281 if (udev->ignore_device) {
282 info("device event will be ignored\n");
286 if (udev->ignore_remove) {
287 info("ignore_remove for '%s'\n", udev->name);
290 /* remove the node */
291 retval = udev_node_remove(udev);
293 /* delete or restore symlinks according to priority */
294 udev_node_update_symlinks(udev, NULL);
298 /* default devices */
299 udev_rules_get_run(rules, udev);
300 if (udev->ignore_device)
301 info("device event will be ignored\n");