2 * udev_device.c - main udev data object
4 * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <sys/ioctl.h>
30 #include <sys/socket.h>
32 #include <linux/sockios.h>
35 #include "udev_rules.h"
38 struct udevice *udev_device_init(void)
42 udev = malloc(sizeof(struct udevice));
45 memset(udev, 0x00, sizeof(struct udevice));
47 INIT_LIST_HEAD(&udev->symlink_list);
48 INIT_LIST_HEAD(&udev->run_list);
49 INIT_LIST_HEAD(&udev->env_list);
51 /* set sysfs device to local storage, can be overridden if needed */
52 udev->dev = &udev->dev_local;
54 /* default node permissions */
56 strcpy(udev->owner, "root");
57 strcpy(udev->group, "root");
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 major, minor;
75 /* read it from sysfs */
76 attr = sysfs_attr_get_value(udev->dev->devpath, "dev");
78 if (sscanf(attr, "%u:%u", &major, &minor) == 2)
79 return makedev(major, minor);
84 static int rename_netif(struct udevice *udev)
90 info("changing net interface name from '%s' to '%s'", udev->dev->kernel_name, udev->name);
94 sk = socket(PF_INET, SOCK_DGRAM, 0);
96 err("error opening socket: %s", strerror(errno));
100 memset(&ifr, 0x00, sizeof(struct ifreq));
101 strlcpy(ifr.ifr_name, udev->dev->kernel_name, IFNAMSIZ);
102 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
103 retval = ioctl(sk, SIOCSIFNAME, &ifr);
107 /* see if the destination interface name already exists */
108 if (errno != EEXIST) {
109 err("error changing netif name %s to %s: %s", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
113 /* free our own name, another process may wait for us */
114 strlcpy(ifr.ifr_newname, udev->dev->kernel_name, IFNAMSIZ);
115 strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
116 retval = ioctl(sk, SIOCSIFNAME, &ifr);
118 err("error changing netif name %s to %s: %s", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
122 /* wait 30 seconds for our target to become available */
123 strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
124 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
127 retval = ioctl(sk, SIOCSIFNAME, &ifr);
129 if (errno != EEXIST) {
130 err("error changing net interface name %s to %s: %s",
131 ifr.ifr_name, ifr.ifr_newname, strerror(errno));
134 dbg("wait for netif '%s' to become free, loop=%i", udev->name, (30 * 20) - loop);
135 usleep(1000 * 1000 / 20);
145 int udev_device_event(struct udev_rules *rules, struct udevice *udev)
149 /* add device node */
150 if (major(udev->devt) != 0 &&
151 (strcmp(udev->action, "add") == 0 || strcmp(udev->action, "change") == 0)) {
152 struct udevice *udev_old;
154 dbg("device node add '%s'", udev->dev->devpath);
156 udev_rules_get_name(rules, udev);
157 if (udev->ignore_device) {
158 info("device event will be ignored");
161 if (udev->name[0] == '\0') {
162 info("device node creation supressed");
166 /* read current database entry, we may want to cleanup symlinks */
167 udev_old = udev_device_init();
168 if (udev_old != NULL) {
169 if (udev_db_get_device(udev_old, udev->dev->devpath) != 0) {
170 udev_device_cleanup(udev_old);
173 info("device '%s' already in database, validate currently present symlinks",
177 /* create node and symlinks */
178 retval = udev_node_add(udev, udev_old);
180 /* store record in database */
181 udev_db_add_device(udev);
183 /* remove possibly left-over symlinks */
184 if (udev_old != NULL) {
185 struct name_entry *link_loop;
186 struct name_entry *link_old_loop;
187 struct name_entry *link_old_tmp_loop;
189 /* remove still valid symlinks from old list */
190 list_for_each_entry_safe(link_old_loop, link_old_tmp_loop, &udev_old->symlink_list, node)
191 list_for_each_entry(link_loop, &udev->symlink_list, node)
192 if (strcmp(link_old_loop->name, link_loop->name) == 0) {
193 dbg("symlink '%s' still valid, keep it", link_old_loop->name);
194 list_del(&link_old_loop->node);
197 udev_node_remove_symlinks(udev_old);
198 udev_device_cleanup(udev_old);
205 if (strcmp(udev->dev->subsystem, "net") == 0 && strcmp(udev->action, "add") == 0) {
206 dbg("netif add '%s'", udev->dev->devpath);
207 udev_rules_get_name(rules, udev);
208 if (udev->ignore_device) {
209 info("device event will be ignored");
213 /* look if we want to change the name of the netif */
214 if (strcmp(udev->name, udev->dev->kernel_name) != 0) {
217 retval = rename_netif(udev);
220 info("renamed netif to '%s'", udev->name);
222 /* export old name */
223 setenv("INTERFACE_OLD", udev->dev->kernel_name, 1);
225 /* now fake the devpath, because the kernel name changed silently */
226 pos = strrchr(udev->dev->devpath, '/');
229 strlcat(udev->dev->devpath, udev->name, sizeof(udev->dev->devpath));
230 strlcpy(udev->dev->kernel_name, udev->name, sizeof(udev->dev->kernel_name));
231 setenv("DEVPATH", udev->dev->devpath, 1);
232 setenv("INTERFACE", udev->name, 1);
238 /* remove device node */
239 if (major(udev->devt) != 0 && strcmp(udev->action, "remove") == 0) {
240 struct name_entry *name_loop;
242 /* import and delete database entry */
243 if (udev_db_get_device(udev, udev->dev->devpath) == 0) {
244 udev_db_delete_device(udev);
245 if (udev->ignore_remove) {
246 dbg("remove event for '%s' requested to be ignored by rule", udev->name);
249 /* restore stored persistent data */
250 list_for_each_entry(name_loop, &udev->env_list, node)
251 putenv(name_loop->name);
253 dbg("'%s' not found in database, using kernel name '%s'", udev->dev->devpath, udev->dev->kernel_name);
254 strlcpy(udev->name, udev->dev->kernel_name, sizeof(udev->name));
257 udev_rules_get_run(rules, udev);
258 if (udev->ignore_device) {
259 info("device event will be ignored");
263 retval = udev_node_remove(udev);
267 /* default devices */
268 udev_rules_get_run(rules, udev);
269 if (udev->ignore_device)
270 info("device event will be ignored");