From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: 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! --- net/bridge/br_if.c | 388 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 388 insertions(+) create mode 100644 net/bridge/br_if.c (limited to 'net/bridge/br_if.c') 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 + * + * $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 +#include +#include +#include +#include +#include +#include +#include + +#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(); + +} -- cgit v1.2.2