Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

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 00000000000..69872bf3b87
--- /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();
+
+}