(2006-08-06) rescue-bootcd

extra/linux-2.6.10/net/bridge/br_notify.c

@@ -0,0 +1,87 @@
+/*
+ *	Device event handling
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_notify.c,v 1.2 2000/02/21 15:51:34 davem Exp $
+ *
+ *	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; either version
+ *	2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+
+#include "br_private.h"
+
+static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr);
+
+struct notifier_block br_device_notifier = {
+	.notifier_call = br_device_event
+};
+
+/*
+ * Handle changes in state of network devices enslaved to a bridge.
+ * 
+ * Note: don't care about up/down if bridge itself is down, because
+ *     port state is checked when bridge is brought up.
+ */
+static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
+{
+	struct net_device *dev = ptr;
+	struct net_bridge_port *p = dev->br_port;
+	struct net_bridge *br;
+
+	/* not a port of a bridge */
+	if (p == NULL)
+		return NOTIFY_DONE;
+
+	br = p->br;
+
+	spin_lock_bh(&br->lock);
+	switch (event) {
+	case NETDEV_CHANGEMTU:
+		dev_set_mtu(br->dev, br_min_mtu(br));
+		break;
+
+	case NETDEV_CHANGEADDR:
+		br_fdb_changeaddr(p, dev->dev_addr);
+		br_stp_recalculate_bridge_id(br);
+		break;
+
+	case NETDEV_CHANGE:	/* device is up but carrier changed */
+		if (!(br->dev->flags & IFF_UP))
+			break;
+
+		if (netif_carrier_ok(dev)) {
+			if (p->state == BR_STATE_DISABLED)
+				br_stp_enable_port(p);
+		} else {
+			if (p->state != BR_STATE_DISABLED)
+				br_stp_disable_port(p);
+		}
+		break;
+
+	case NETDEV_DOWN:
+		if (br->dev->flags & IFF_UP)
+			br_stp_disable_port(p);
+		break;
+
+	case NETDEV_UP:
+		if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) 
+			br_stp_enable_port(p);
+		break;
+
+	case NETDEV_UNREGISTER:
+		spin_unlock_bh(&br->lock);
+		br_del_if(br, dev);
+		goto done;
+	} 
+	spin_unlock_bh(&br->lock);
+
+ done:
+	return NOTIFY_DONE;
+}