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--- ip_up_down [2018/10/04 10:57] – [dev_ioctl()] rpjday
+++ ip_up_down [2018/10/04 11:09] (current) – [__dev_change_flags()] rpjday
@@ Line 484: / Line 484: @@
 	case SIOCSIFFLAGS:	/* Set interface flags */
 		return dev_change_flags(dev, ifr->ifr_flags);
+</code>
+===== net/core/dev.c =====
+==== dev_change_flags() ====
+<code>
+int dev_change_flags(struct net_device *dev, unsigned int flags)
+{
+	int ret;
+	unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
+	ret = __dev_change_flags(dev, flags);
+	if (ret < 0)
+		return ret;
+	changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags);
+	__dev_notify_flags(dev, old_flags, changes);
+	return ret;
+}
+</code>
+==== __dev_change_flags() ====
+<code>
+int __dev_change_flags(struct net_device *dev, unsigned int flags)
+{
+	unsigned int old_flags = dev->flags;
+	int ret;
+	ASSERT_RTNL();
+	/*
+	 *	Set the flags on our device.
+	 */
+	dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
+			       IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
+			       IFF_AUTOMEDIA)) |
+		     (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
+				    IFF_ALLMULTI));
+... snip ...
+	ret = 0;
+	if ((old_flags ^ flags) & IFF_UP) {
+		if (old_flags & IFF_UP)
+			__dev_close(dev);
+		else
+			ret = __dev_open(dev);
+	}
 </code>