2 * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
26 #include <sys/ioctl.h>
27 #include <sys/socket.h>
29 #include <linux/sockios.h>
32 #include "udev-rules.h"
34 struct udev_event *udev_event_new(struct udev_device *dev)
36 struct udev_event *event;
38 event = malloc(sizeof(struct udev_event));
41 memset(event, 0x00, sizeof(struct udev_event));
44 event->udev = udev_device_get_udev(dev);
45 udev_list_init(&event->run_list);
47 util_strlcpy(event->owner, "0", sizeof(event->owner));
48 util_strlcpy(event->group, "0", sizeof(event->group));
50 dbg(event->udev, "allocated event %p\n", event);
54 void udev_event_unref(struct udev_event *event)
56 udev_list_cleanup(event->udev, &event->run_list);
57 dbg(event->udev, "free event %p\n", event);
61 static void kernel_log(struct ifreq ifr)
66 klog = open("/dev/kmsg", O_WRONLY);
70 f = fdopen(klog, "w");
76 fprintf(f, "<6>udev: renamed network interface %s to %s\n",
77 ifr.ifr_name, ifr.ifr_newname);
81 static int rename_netif(struct udev_event *event)
83 struct udev_device *dev = event->dev;
88 info(event->udev, "changing net interface name from '%s' to '%s'\n",
89 udev_device_get_sysname(dev), event->name);
93 sk = socket(PF_INET, SOCK_DGRAM, 0);
95 err(event->udev, "error opening socket: %m\n");
99 memset(&ifr, 0x00, sizeof(struct ifreq));
100 util_strlcpy(ifr.ifr_name, udev_device_get_sysname(dev), IFNAMSIZ);
101 util_strlcpy(ifr.ifr_newname, event->name, IFNAMSIZ);
102 err = ioctl(sk, SIOCSIFNAME, &ifr);
108 /* see if the destination interface name already exists */
109 if (errno != EEXIST) {
110 err(event->udev, "error changing netif name %s to %s: %m\n",
111 ifr.ifr_name, ifr.ifr_newname);
115 /* free our own name, another process may wait for us */
116 util_strlcpy(ifr.ifr_newname, udev_device_get_sysname(dev), IFNAMSIZ);
117 util_strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
118 err = ioctl(sk, SIOCSIFNAME, &ifr);
120 err(event->udev, "error changing netif name %s to %s: %m\n",
121 ifr.ifr_name, ifr.ifr_newname);
125 /* wait 30 seconds for our target to become available */
126 util_strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
127 util_strlcpy(ifr.ifr_newname, udev_device_get_devnode(dev), IFNAMSIZ);
130 err = ioctl(sk, SIOCSIFNAME, &ifr);
136 if (errno != EEXIST) {
137 err(event->udev, "error changing net interface name %s to %s: %m\n",
138 ifr.ifr_name, ifr.ifr_newname);
141 dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
142 udev_device_get_devnode(dev), (30 * 20) - loop);
143 usleep(1000 * 1000 / 20);
152 int udev_event_run(struct udev_event *event, struct udev_rules *rules)
154 struct udev_device *dev = event->dev;
157 if (udev_device_get_devpath_old(dev) != NULL) {
158 if (udev_device_rename_db(dev, udev_device_get_devpath(dev)) == 0)
159 info(event->udev, "moved database from '%s' to '%s'\n",
160 udev_device_get_devpath_old(dev), udev_device_get_devpath(dev));
163 /* add device node */
164 if (major(udev_device_get_devnum(dev)) != 0 &&
165 (strcmp(udev_device_get_action(dev), "add") == 0 || strcmp(udev_device_get_action(dev), "change") == 0)) {
166 char filename[UTIL_PATH_SIZE];
167 struct udev_device *dev_old;
169 dbg(event->udev, "device node add '%s'\n", udev_device_get_devpath(dev));
171 udev_rules_get_name(rules, event);
172 if (event->ignore_device) {
173 info(event->udev, "device event will be ignored\n");
177 if (event->name[0] == '\0') {
178 info(event->udev, "device node creation supressed\n");
182 /* set device node name */
183 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
184 util_strlcat(filename, "/", sizeof(filename));
185 util_strlcat(filename, event->name, sizeof(filename));
186 udev_device_set_devnode(dev, filename);
188 /* read current database entry; cleanup, if it is known device */
189 dev_old = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
190 if (dev_old != NULL) {
191 info(event->udev, "device '%s' already in database, updating\n",
192 udev_device_get_devpath(dev));
193 udev_node_update_old_links(dev, dev_old, event->test);
194 udev_device_unref(dev_old);
197 udev_device_update_db(dev);
199 err = udev_node_add(dev, event->mode, event->owner, event->group, event->test);
207 if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0) {
208 dbg(event->udev, "netif add '%s'\n", udev_device_get_devpath(dev));
210 udev_rules_get_name(rules, event);
211 if (event->ignore_device) {
212 info(event->udev, "device event will be ignored\n");
215 if (event->name[0] == '\0') {
216 info(event->udev, "device renaming supressed\n");
220 /* look if we want to change the name of the netif */
221 if (strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
222 char syspath[UTIL_PATH_SIZE];
225 err = rename_netif(event);
228 info(event->udev, "renamed netif to '%s'\n", event->name);
230 /* remember old name */
231 udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
233 /* now change the devpath, because the kernel device name has changed */
234 util_strlcpy(syspath, udev_device_get_syspath(dev), sizeof(syspath));
235 pos = strrchr(syspath, '/');
238 util_strlcat(syspath, event->name, sizeof(syspath));
239 udev_device_set_syspath(event->dev, syspath);
240 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
241 info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
247 /* remove device node */
248 if (major(udev_device_get_devnum(dev)) != 0 && strcmp(udev_device_get_action(dev), "remove") == 0) {
249 /* import database entry and delete it */
250 udev_device_read_db(dev);
252 udev_device_delete_db(dev);
254 if (udev_device_get_devnode(dev) == NULL) {
255 char devnode[UTIL_PATH_SIZE];
257 info(event->udev, "'%s' not found in database, using kernel name '%s'\n",
258 udev_device_get_syspath(dev), udev_device_get_sysname(dev));
259 util_strlcpy(devnode, udev_get_dev_path(event->udev), sizeof(devnode));
260 util_strlcat(devnode, "/", sizeof(devnode));
261 util_strlcat(devnode, udev_device_get_sysname(dev), sizeof(devnode));
262 udev_device_set_devnode(dev, devnode);
265 udev_rules_get_run(rules, event);
266 if (event->ignore_device) {
267 info(event->udev, "device event will be ignored\n");
271 if (udev_device_get_ignore_remove(dev)) {
272 info(event->udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
276 err = udev_node_remove(dev, event->test);
280 /* default devices */
281 udev_rules_get_run(rules, event);
282 if (event->ignore_device)
283 info(event->udev, "device event will be ignored\n");