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git.ipfire.org Git - thirdparty/systemd.git/blob - udev_device.c
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(void)
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");
60 void udev_device_cleanup(struct udevice
*udev
)
62 name_list_cleanup(&udev
->symlink_list
);
63 name_list_cleanup(&udev
->run_list
);
64 name_list_cleanup(&udev
->env_list
);
68 dev_t
udev_device_get_devt(struct udevice
*udev
)
71 unsigned int maj
, min
;
73 /* read it from sysfs */
74 attr
= sysfs_attr_get_value(udev
->dev
->devpath
, "dev");
76 if (sscanf(attr
, "%u:%u", &maj
, &min
) == 2)
77 return makedev(maj
, min
);
82 static int rename_netif(struct udevice
*udev
)
88 info("changing net interface name from '%s' to '%s'", udev
->dev
->kernel
, udev
->name
);
92 sk
= socket(PF_INET
, SOCK_DGRAM
, 0);
94 err("error opening socket: %s", strerror(errno
));
98 memset(&ifr
, 0x00, sizeof(struct ifreq
));
99 strlcpy(ifr
.ifr_name
, udev
->dev
->kernel
, IFNAMSIZ
);
100 strlcpy(ifr
.ifr_newname
, udev
->name
, IFNAMSIZ
);
101 retval
= ioctl(sk
, SIOCSIFNAME
, &ifr
);
105 /* see if the destination interface name already exists */
106 if (errno
!= EEXIST
) {
107 err("error changing netif name %s to %s: %s", ifr
.ifr_name
, ifr
.ifr_newname
, strerror(errno
));
111 /* free our own name, another process may wait for us */
112 strlcpy(ifr
.ifr_newname
, udev
->dev
->kernel
, IFNAMSIZ
);
113 strlcat(ifr
.ifr_newname
, "_rename", IFNAMSIZ
);
114 retval
= ioctl(sk
, SIOCSIFNAME
, &ifr
);
116 err("error changing netif name %s to %s: %s", ifr
.ifr_name
, ifr
.ifr_newname
, strerror(errno
));
120 /* wait 30 seconds for our target to become available */
121 strlcpy(ifr
.ifr_name
, ifr
.ifr_newname
, IFNAMSIZ
);
122 strlcpy(ifr
.ifr_newname
, udev
->name
, IFNAMSIZ
);
125 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);
144 int udev_device_event(struct udev_rules
*rules
, struct udevice
*udev
)
148 /* add device node */
149 if (major(udev
->devt
) != 0 &&
150 (strcmp(udev
->action
, "add") == 0 || strcmp(udev
->action
, "change") == 0)) {
151 struct udevice
*udev_old
;
153 dbg("device node add '%s'", udev
->dev
->devpath
);
155 udev_rules_get_name(rules
, udev
);
156 if (udev
->ignore_device
) {
157 info("device event will be ignored");
160 if (udev
->name
[0] == '\0') {
161 info("device node creation supressed");
165 /* read current database entry, we may want to cleanup symlinks */
166 udev_old
= udev_device_init();
167 if (udev_old
!= NULL
) {
168 if (udev_db_get_device(udev_old
, udev
->dev
->devpath
) != 0) {
169 udev_device_cleanup(udev_old
);
172 info("device '%s' already in database, validate currently present symlinks",
176 /* create node and symlinks */
177 retval
= udev_node_add(udev
, udev_old
);
179 /* store record in database */
180 udev_db_add_device(udev
);
182 /* remove possibly left-over symlinks */
183 if (udev_old
!= NULL
) {
184 struct name_entry
*link_loop
;
185 struct name_entry
*link_old_loop
;
186 struct name_entry
*link_old_tmp_loop
;
188 /* remove still valid symlinks from old list */
189 list_for_each_entry_safe(link_old_loop
, link_old_tmp_loop
, &udev_old
->symlink_list
, node
)
190 list_for_each_entry(link_loop
, &udev
->symlink_list
, node
)
191 if (strcmp(link_old_loop
->name
, link_loop
->name
) == 0) {
192 dbg("symlink '%s' still valid, keep it", link_old_loop
->name
);
193 list_del(&link_old_loop
->node
);
196 udev_node_remove_symlinks(udev_old
);
197 udev_device_cleanup(udev_old
);
204 if (strcmp(udev
->dev
->subsystem
, "net") == 0 && strcmp(udev
->action
, "add") == 0) {
205 dbg("netif add '%s'", udev
->dev
->devpath
);
206 udev_rules_get_name(rules
, udev
);
207 if (udev
->ignore_device
) {
208 info("device event will be ignored");
212 /* look if we want to change the name of the netif */
213 if (strcmp(udev
->name
, udev
->dev
->kernel
) != 0) {
216 retval
= rename_netif(udev
);
219 info("renamed netif to '%s'", udev
->name
);
221 /* export old name */
222 setenv("INTERFACE_OLD", udev
->dev
->kernel
, 1);
224 /* now fake the devpath, because the kernel name changed silently */
225 pos
= strrchr(udev
->dev
->devpath
, '/');
228 strlcat(udev
->dev
->devpath
, udev
->name
, sizeof(udev
->dev
->devpath
));
229 strlcpy(udev
->dev
->kernel
, udev
->name
, sizeof(udev
->dev
->kernel
));
230 setenv("DEVPATH", udev
->dev
->devpath
, 1);
231 setenv("INTERFACE", udev
->name
, 1);
237 /* remove device node */
238 if (major(udev
->devt
) != 0 && strcmp(udev
->action
, "remove") == 0) {
239 struct name_entry
*name_loop
;
241 /* import and delete database entry */
242 if (udev_db_get_device(udev
, udev
->dev
->devpath
) == 0) {
243 udev_db_delete_device(udev
);
244 if (udev
->ignore_remove
) {
245 dbg("remove event for '%s' requested to be ignored by rule", udev
->name
);
248 /* restore stored persistent data */
249 list_for_each_entry(name_loop
, &udev
->env_list
, node
)
250 putenv(name_loop
->name
);
252 dbg("'%s' not found in database, using kernel name '%s'", udev
->dev
->devpath
, udev
->dev
->kernel
);
253 strlcpy(udev
->name
, udev
->dev
->kernel
, sizeof(udev
->name
));
256 udev_rules_get_run(rules
, udev
);
257 if (udev
->ignore_device
) {
258 info("device event will be ignored");
262 retval
= udev_node_remove(udev
);
266 /* default devices */
267 udev_rules_get_run(rules
, udev
);
268 if (udev
->ignore_device
)
269 info("device event will be ignored");