+/*
+ * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <ctype.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <linux/sockios.h>
+
+#include "udev.h"
+#include "udev_rules.h"
+
+
+static void kernel_log(struct ifreq ifr)
+{
+ int klog;
+ FILE *f;
+
+ klog = open("/dev/kmsg", O_WRONLY);
+ if (klog < 0)
+ return;
+
+ f = fdopen(klog, "w");
+ if (f == NULL) {
+ close(klog);
+ return;
+ }
+
+ fprintf(f, "<6>udev: renamed network interface %s to %s\n",
+ ifr.ifr_name, ifr.ifr_newname);
+ fclose(f);
+}
+
+static int rename_netif(struct udevice *udev)
+{
+ int sk;
+ struct ifreq ifr;
+ int retval;
+
+ info("changing net interface name from '%s' to '%s'\n", udev->dev->kernel, udev->name);
+ if (udev->test_run)
+ return 0;
+
+ sk = socket(PF_INET, SOCK_DGRAM, 0);
+ if (sk < 0) {
+ err("error opening socket: %s\n", strerror(errno));
+ return -1;
+ }
+
+ memset(&ifr, 0x00, sizeof(struct ifreq));
+ strlcpy(ifr.ifr_name, udev->dev->kernel, IFNAMSIZ);
+ strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
+ retval = ioctl(sk, SIOCSIFNAME, &ifr);
+ if (retval == 0)
+ kernel_log(ifr);
+ else {
+ int loop;
+
+ /* see if the destination interface name already exists */
+ if (errno != EEXIST) {
+ err("error changing netif name %s to %s: %s\n", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
+ goto exit;
+ }
+
+ /* free our own name, another process may wait for us */
+ strlcpy(ifr.ifr_newname, udev->dev->kernel, IFNAMSIZ);
+ strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
+ retval = ioctl(sk, SIOCSIFNAME, &ifr);
+ if (retval != 0) {
+ err("error changing netif name %s to %s: %s\n", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
+ goto exit;
+ }
+
+ /* wait 30 seconds for our target to become available */
+ strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
+ strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
+ loop = 30 * 20;
+ while (loop--) {
+ retval = ioctl(sk, SIOCSIFNAME, &ifr);
+ if (retval == 0) {
+ kernel_log(ifr);
+ break;
+ }
+
+ if (errno != EEXIST) {
+ err("error changing net interface name %s to %s: %s\n",
+ ifr.ifr_name, ifr.ifr_newname, strerror(errno));
+ break;
+ }
+ dbg("wait for netif '%s' to become free, loop=%i\n", udev->name, (30 * 20) - loop);
+ usleep(1000 * 1000 / 20);
+ }
+ }
+
+exit:
+ close(sk);
+ return retval;
+}
+
+int udev_device_event(struct udev_rules *rules, struct udevice *udev)
+{
+ int retval = 0;
+
+ if (udev->devpath_old != NULL)
+ if (udev_db_rename(udev->devpath_old, udev->dev->devpath) == 0)
+ info("moved database from '%s' to '%s'\n", udev->devpath_old, udev->dev->devpath);
+
+ /* add device node */
+ if (major(udev->devt) != 0 &&
+ (strcmp(udev->action, "add") == 0 || strcmp(udev->action, "change") == 0)) {
+ struct udevice *udev_old;
+
+ dbg("device node add '%s'\n", udev->dev->devpath);
+
+ udev_rules_get_name(rules, udev);
+ if (udev->ignore_device) {
+ info("device event will be ignored\n");
+ goto exit;
+ }
+ if (udev->name[0] == '\0') {
+ info("device node creation supressed\n");
+ goto exit;
+ }
+
+ /* read current database entry; cleanup, if it is known device */
+ udev_old = udev_device_init(NULL);
+ if (udev_old != NULL) {
+ udev_old->test_run = udev->test_run;
+ if (udev_db_get_device(udev_old, udev->dev->devpath) == 0) {
+ info("device '%s' already in database, cleanup\n", udev->dev->devpath);
+ udev_db_delete_device(udev_old);
+ } else {
+ udev_device_cleanup(udev_old);
+ udev_old = NULL;
+ }
+ }
+
+ /* create node */
+ retval = udev_node_add(udev);
+ if (retval != 0)
+ goto exit;
+
+ /* store in database */
+ udev_db_add_device(udev);
+
+ /* create, replace, delete symlinks according to priority */
+ udev_node_update_symlinks(udev, udev_old);
+
+ if (udev_old != NULL)
+ udev_device_cleanup(udev_old);
+ goto exit;
+ }
+
+ /* add netif */
+ if (strcmp(udev->dev->subsystem, "net") == 0 && strcmp(udev->action, "add") == 0) {
+ dbg("netif add '%s'\n", udev->dev->devpath);
+ udev_rules_get_name(rules, udev);
+ if (udev->ignore_device) {
+ info("device event will be ignored\n");
+ goto exit;
+ }
+ if (udev->name[0] == '\0') {
+ info("device renaming supressed\n");
+ goto exit;
+ }
+
+ /* look if we want to change the name of the netif */
+ if (strcmp(udev->name, udev->dev->kernel) != 0) {
+ char devpath[PATH_MAX];
+ char *pos;
+
+ retval = rename_netif(udev);
+ if (retval != 0)
+ goto exit;
+ info("renamed netif to '%s'\n", udev->name);
+
+ /* export old name */
+ setenv("INTERFACE_OLD", udev->dev->kernel, 1);
+
+ /* now change the devpath, because the kernel device name has changed */
+ strlcpy(devpath, udev->dev->devpath, sizeof(devpath));
+ pos = strrchr(devpath, '/');
+ if (pos != NULL) {
+ pos[1] = '\0';
+ strlcat(devpath, udev->name, sizeof(devpath));
+ sysfs_device_set_values(udev->dev, devpath, NULL, NULL);
+ setenv("DEVPATH", udev->dev->devpath, 1);
+ setenv("INTERFACE", udev->name, 1);
+ info("changed devpath to '%s'\n", udev->dev->devpath);
+ }
+ }
+ goto exit;
+ }
+
+ /* remove device node */
+ if (major(udev->devt) != 0 && strcmp(udev->action, "remove") == 0) {
+ struct name_entry *name_loop;
+
+ /* import database entry, and delete it */
+ if (udev_db_get_device(udev, udev->dev->devpath) == 0) {
+ udev_db_delete_device(udev);
+ /* restore stored persistent data */
+ list_for_each_entry(name_loop, &udev->env_list, node)
+ putenv(name_loop->name);
+ } else {
+ dbg("'%s' not found in database, using kernel name '%s'\n",
+ udev->dev->devpath, udev->dev->kernel);
+ strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
+ }
+
+ udev_rules_get_run(rules, udev);
+ if (udev->ignore_device) {
+ info("device event will be ignored\n");
+ goto exit;
+ }
+
+ if (udev->ignore_remove) {
+ info("ignore_remove for '%s'\n", udev->name);
+ goto exit;
+ }
+ /* remove the node */
+ retval = udev_node_remove(udev);
+
+ /* delete or restore symlinks according to priority */
+ udev_node_update_symlinks(udev, NULL);
+ goto exit;
+ }
+
+ /* default devices */
+ udev_rules_get_run(rules, udev);
+ if (udev->ignore_device)
+ info("device event will be ignored\n");
+
+exit:
+ return retval;
+}
~ianmdlvl / elogind.git / commitdiff