1 files changed, 388 insertions, 0 deletions
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
new file mode 100644
index 0000000..69872bf
--- /dev/null
+++ b/net/bridge/br_if.c
@@ -0,0 +1,388 @@
+/*
+ *	Userspace interface
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_if.c,v 1.7 2001/12/24 00:59:55 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 <linux/netdevice.h>
+#include <linux/ethtool.h>
+#include <linux/if_arp.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/rtnetlink.h>
+#include <net/sock.h>
+
+#include "br_private.h"
+
+/*
+ * Determine initial path cost based on speed.
+ * using recommendations from 802.1d standard
+ *
+ * Need to simulate user ioctl because not all device's that support
+ * ethtool, use ethtool_ops.  Also, since driver might sleep need to
+ * not be holding any locks.
+ */
+static int br_initial_port_cost(struct net_device *dev)
+{
+
+	struct ethtool_cmd ecmd = { ETHTOOL_GSET };
+	struct ifreq ifr;
+	mm_segment_t old_fs;
+	int err;
+
+	strncpy(ifr.ifr_name, dev->name, IFNAMSIZ);
+	ifr.ifr_data = (void __user *) &ecmd;
+
+	old_fs = get_fs();
+	set_fs(KERNEL_DS);
+	err = dev_ethtool(&ifr);
+	set_fs(old_fs);
+	
+	if (!err) {
+		switch(ecmd.speed) {
+		case SPEED_100:
+			return 19;
+		case SPEED_1000:
+			return 4;
+		case SPEED_10000:
+			return 2;
+		case SPEED_10:
+			return 100;
+		default:
+			pr_info("bridge: can't decode speed from %s: %d\n",
+				dev->name, ecmd.speed);
+			return 100;
+		}
+	}
+
+	/* Old silly heuristics based on name */
+	if (!strncmp(dev->name, "lec", 3))
+		return 7;
+
+	if (!strncmp(dev->name, "plip", 4))
+		return 2500;
+
+	return 100;	/* assume old 10Mbps */
+}
+
+static void destroy_nbp(struct net_bridge_port *p)
+{
+	struct net_device *dev = p->dev;
+
+	dev->br_port = NULL;
+	p->br = NULL;
+	p->dev = NULL;
+	dev_put(dev);
+
+	br_sysfs_freeif(p);
+}
+
+static void destroy_nbp_rcu(struct rcu_head *head)
+{
+	struct net_bridge_port *p =
+			container_of(head, struct net_bridge_port, rcu);
+	destroy_nbp(p);
+}
+
+/* called with RTNL */
+static void del_nbp(struct net_bridge_port *p)
+{
+	struct net_bridge *br = p->br;
+	struct net_device *dev = p->dev;
+
+	dev_set_promiscuity(dev, -1);
+
+	spin_lock_bh(&br->lock);
+	br_stp_disable_port(p);
+	spin_unlock_bh(&br->lock);
+
+	br_fdb_delete_by_port(br, p);
+
+	list_del_rcu(&p->list);
+
+	del_timer_sync(&p->message_age_timer);
+	del_timer_sync(&p->forward_delay_timer);
+	del_timer_sync(&p->hold_timer);
+	
+	call_rcu(&p->rcu, destroy_nbp_rcu);
+}
+
+/* called with RTNL */
+static void del_br(struct net_bridge *br)
+{
+	struct net_bridge_port *p, *n;
+
+	list_for_each_entry_safe(p, n, &br->port_list, list) {
+		br_sysfs_removeif(p);
+		del_nbp(p);
+	}
+
+	del_timer_sync(&br->gc_timer);
+
+	br_sysfs_delbr(br->dev);
+ 	unregister_netdevice(br->dev);
+}
+
+static struct net_device *new_bridge_dev(const char *name)
+{
+	struct net_bridge *br;
+	struct net_device *dev;
+
+	dev = alloc_netdev(sizeof(struct net_bridge), name,
+			   br_dev_setup);
+	
+	if (!dev)
+		return NULL;
+
+	br = netdev_priv(dev);
+	br->dev = dev;
+
+	spin_lock_init(&br->lock);
+	INIT_LIST_HEAD(&br->port_list);
+	spin_lock_init(&br->hash_lock);
+
+	br->bridge_id.prio[0] = 0x80;
+	br->bridge_id.prio[1] = 0x00;
+	memset(br->bridge_id.addr, 0, ETH_ALEN);
+
+	br->stp_enabled = 0;
+	br->designated_root = br->bridge_id;
+	br->root_path_cost = 0;
+	br->root_port = 0;
+	br->bridge_max_age = br->max_age = 20 * HZ;
+	br->bridge_hello_time = br->hello_time = 2 * HZ;
+	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
+	br->topology_change = 0;
+	br->topology_change_detected = 0;
+	br->ageing_time = 300 * HZ;
+	INIT_LIST_HEAD(&br->age_list);
+
+	br_stp_timer_init(br);
+
+	return dev;
+}
+
+/* find an available port number */
+static int find_portno(struct net_bridge *br)
+{
+	int index;
+	struct net_bridge_port *p;
+	unsigned long *inuse;
+
+	inuse = kmalloc(BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long),
+			GFP_KERNEL);
+	if (!inuse)
+		return -ENOMEM;
+
+	memset(inuse, 0, BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long));
+	set_bit(0, inuse);	/* zero is reserved */
+	list_for_each_entry(p, &br->port_list, list) {
+		set_bit(p->port_no, inuse);
+	}
+	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
+	kfree(inuse);
+
+	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
+}
+
+/* called with RTNL */
+static struct net_bridge_port *new_nbp(struct net_bridge *br, 
+				       struct net_device *dev,
+				       unsigned long cost)
+{
+	int index;
+	struct net_bridge_port *p;
+	
+	index = find_portno(br);
+	if (index < 0)
+		return ERR_PTR(index);
+
+	p = kmalloc(sizeof(*p), GFP_KERNEL);
+	if (p == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	memset(p, 0, sizeof(*p));
+	p->br = br;
+	dev_hold(dev);
+	p->dev = dev;
+	p->path_cost = cost;
+ 	p->priority = 0x8000 >> BR_PORT_BITS;
+	dev->br_port = p;
+	p->port_no = index;
+	br_init_port(p);
+	p->state = BR_STATE_DISABLED;
+	kobject_init(&p->kobj);
+
+	return p;
+}
+
+int br_add_bridge(const char *name)
+{
+	struct net_device *dev;
+	int ret;
+
+	dev = new_bridge_dev(name);
+	if (!dev) 
+		return -ENOMEM;
+
+	rtnl_lock();
+	if (strchr(dev->name, '%')) {
+		ret = dev_alloc_name(dev, dev->name);
+		if (ret < 0)
+			goto err1;
+	}
+
+	ret = register_netdevice(dev);
+	if (ret)
+		goto err2;
+
+	/* network device kobject is not setup until
+	 * after rtnl_unlock does it's hotplug magic.
+	 * so hold reference to avoid race.
+	 */
+	dev_hold(dev);
+	rtnl_unlock();
+
+	ret = br_sysfs_addbr(dev);
+	dev_put(dev);
+
+	if (ret) 
+		unregister_netdev(dev);
+ out:
+	return ret;
+
+ err2:
+	free_netdev(dev);
+ err1:
+	rtnl_unlock();
+	goto out;
+}
+
+int br_del_bridge(const char *name)
+{
+	struct net_device *dev;
+	int ret = 0;
+
+	rtnl_lock();
+	dev = __dev_get_by_name(name);
+	if (dev == NULL) 
+		ret =  -ENXIO; 	/* Could not find device */
+
+	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
+		/* Attempt to delete non bridge device! */
+		ret = -EPERM;
+	}
+
+	else if (dev->flags & IFF_UP) {
+		/* Not shutdown yet. */
+		ret = -EBUSY;
+	} 
+
+	else 
+		del_br(netdev_priv(dev));
+
+	rtnl_unlock();
+	return ret;
+}
+
+/* Mtu of the bridge pseudo-device 1500 or the minimum of the ports */
+int br_min_mtu(const struct net_bridge *br)
+{
+	const struct net_bridge_port *p;
+	int mtu = 0;
+
+	ASSERT_RTNL();
+
+	if (list_empty(&br->port_list))
+		mtu = 1500;
+	else {
+		list_for_each_entry(p, &br->port_list, list) {
+			if (!mtu  || p->dev->mtu < mtu)
+				mtu = p->dev->mtu;
+		}
+	}
+	return mtu;
+}
+
+/* called with RTNL */
+int br_add_if(struct net_bridge *br, struct net_device *dev)
+{
+	struct net_bridge_port *p;
+	int err = 0;
+
+	if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
+		return -EINVAL;
+
+	if (dev->hard_start_xmit == br_dev_xmit)
+		return -ELOOP;
+
+	if (dev->br_port != NULL)
+		return -EBUSY;
+
+	if (IS_ERR(p = new_nbp(br, dev, br_initial_port_cost(dev))))
+		return PTR_ERR(p);
+
+ 	if ((err = br_fdb_insert(br, p, dev->dev_addr)))
+		destroy_nbp(p);
+ 
+	else if ((err = br_sysfs_addif(p)))
+		del_nbp(p);
+	else {
+		dev_set_promiscuity(dev, 1);
+
+		list_add_rcu(&p->list, &br->port_list);
+
+		spin_lock_bh(&br->lock);
+		br_stp_recalculate_bridge_id(br);
+		if ((br->dev->flags & IFF_UP) 
+		    && (dev->flags & IFF_UP) && netif_carrier_ok(dev))
+			br_stp_enable_port(p);
+		spin_unlock_bh(&br->lock);
+
+		dev_set_mtu(br->dev, br_min_mtu(br));
+	}
+
+	return err;
+}
+
+/* called with RTNL */
+int br_del_if(struct net_bridge *br, struct net_device *dev)
+{
+	struct net_bridge_port *p = dev->br_port;
+	
+	if (!p || p->br != br) 
+		return -EINVAL;
+
+	br_sysfs_removeif(p);
+	del_nbp(p);
+
+	spin_lock_bh(&br->lock);
+	br_stp_recalculate_bridge_id(br);
+	spin_unlock_bh(&br->lock);
+
+	return 0;
+}
+
+void __exit br_cleanup_bridges(void)
+{
+	struct net_device *dev, *nxt;
+
+	rtnl_lock();
+	for (dev = dev_base; dev; dev = nxt) {
+		nxt = dev->next;
+		if (dev->priv_flags & IFF_EBRIDGE)
+			del_br(dev->priv);
+	}
+	rtnl_unlock();
+
+}