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-rw-r--r--net/bridge/br_if.c388
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 000000000000..69872bf3b87e
--- /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();
+
+}