486 строки
9.6 KiB
C
486 строки
9.6 KiB
C
/*
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* Userspace interface
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* Linux ethernet bridge
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*
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* Authors:
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* Lennert Buytenhek <buytenh@gnu.org>
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*
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* $Id: br_if.c,v 1.7 2001/12/24 00:59:55 davem Exp $
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/ethtool.h>
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#include <linux/if_arp.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/rtnetlink.h>
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#include <linux/if_ether.h>
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#include <net/sock.h>
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#include "br_private.h"
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/*
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* Determine initial path cost based on speed.
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* using recommendations from 802.1d standard
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*
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* Need to simulate user ioctl because not all device's that support
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* ethtool, use ethtool_ops. Also, since driver might sleep need to
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* not be holding any locks.
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*/
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static int port_cost(struct net_device *dev)
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{
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struct ethtool_cmd ecmd = { ETHTOOL_GSET };
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struct ifreq ifr;
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mm_segment_t old_fs;
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int err;
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strncpy(ifr.ifr_name, dev->name, IFNAMSIZ);
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ifr.ifr_data = (void __user *) &ecmd;
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old_fs = get_fs();
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set_fs(KERNEL_DS);
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err = dev_ethtool(&ifr);
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set_fs(old_fs);
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if (!err) {
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switch(ecmd.speed) {
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case SPEED_100:
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return 19;
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case SPEED_1000:
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return 4;
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case SPEED_10000:
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return 2;
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case SPEED_10:
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return 100;
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}
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}
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/* Old silly heuristics based on name */
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if (!strncmp(dev->name, "lec", 3))
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return 7;
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if (!strncmp(dev->name, "plip", 4))
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return 2500;
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return 100; /* assume old 10Mbps */
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}
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/*
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* Check for port carrier transistions.
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* Called from work queue to allow for calling functions that
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* might sleep (such as speed check), and to debounce.
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*/
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static void port_carrier_check(void *arg)
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{
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struct net_device *dev = arg;
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struct net_bridge_port *p;
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struct net_bridge *br;
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rtnl_lock();
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p = dev->br_port;
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if (!p)
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goto done;
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br = p->br;
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if (netif_carrier_ok(dev))
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p->path_cost = port_cost(dev);
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if (br->dev->flags & IFF_UP) {
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spin_lock_bh(&br->lock);
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if (netif_carrier_ok(dev)) {
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if (p->state == BR_STATE_DISABLED)
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br_stp_enable_port(p);
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} else {
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if (p->state != BR_STATE_DISABLED)
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br_stp_disable_port(p);
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}
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spin_unlock_bh(&br->lock);
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}
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done:
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rtnl_unlock();
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}
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static void release_nbp(struct kobject *kobj)
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{
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struct net_bridge_port *p
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= container_of(kobj, struct net_bridge_port, kobj);
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kfree(p);
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}
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static struct kobj_type brport_ktype = {
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#ifdef CONFIG_SYSFS
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.sysfs_ops = &brport_sysfs_ops,
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#endif
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.release = release_nbp,
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};
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static void destroy_nbp(struct net_bridge_port *p)
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{
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struct net_device *dev = p->dev;
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p->br = NULL;
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p->dev = NULL;
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dev_put(dev);
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kobject_put(&p->kobj);
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}
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static void destroy_nbp_rcu(struct rcu_head *head)
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{
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struct net_bridge_port *p =
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container_of(head, struct net_bridge_port, rcu);
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destroy_nbp(p);
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}
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/* Delete port(interface) from bridge is done in two steps.
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* via RCU. First step, marks device as down. That deletes
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* all the timers and stops new packets from flowing through.
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*
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* Final cleanup doesn't occur until after all CPU's finished
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* processing packets.
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*
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* Protected from multiple admin operations by RTNL mutex
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*/
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static void del_nbp(struct net_bridge_port *p)
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{
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struct net_bridge *br = p->br;
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struct net_device *dev = p->dev;
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sysfs_remove_link(&br->ifobj, dev->name);
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dev_set_promiscuity(dev, -1);
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cancel_delayed_work(&p->carrier_check);
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spin_lock_bh(&br->lock);
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br_stp_disable_port(p);
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spin_unlock_bh(&br->lock);
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br_fdb_delete_by_port(br, p);
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list_del_rcu(&p->list);
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rcu_assign_pointer(dev->br_port, NULL);
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kobject_uevent(&p->kobj, KOBJ_REMOVE);
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kobject_del(&p->kobj);
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call_rcu(&p->rcu, destroy_nbp_rcu);
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}
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/* called with RTNL */
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static void del_br(struct net_bridge *br)
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{
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struct net_bridge_port *p, *n;
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list_for_each_entry_safe(p, n, &br->port_list, list) {
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del_nbp(p);
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}
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del_timer_sync(&br->gc_timer);
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br_sysfs_delbr(br->dev);
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unregister_netdevice(br->dev);
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}
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static struct net_device *new_bridge_dev(const char *name)
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{
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struct net_bridge *br;
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struct net_device *dev;
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dev = alloc_netdev(sizeof(struct net_bridge), name,
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br_dev_setup);
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if (!dev)
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return NULL;
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br = netdev_priv(dev);
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br->dev = dev;
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spin_lock_init(&br->lock);
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INIT_LIST_HEAD(&br->port_list);
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spin_lock_init(&br->hash_lock);
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br->bridge_id.prio[0] = 0x80;
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br->bridge_id.prio[1] = 0x00;
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memcpy(br->group_addr, br_group_address, ETH_ALEN);
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br->feature_mask = dev->features;
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br->stp_enabled = 0;
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br->designated_root = br->bridge_id;
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br->root_path_cost = 0;
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br->root_port = 0;
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br->bridge_max_age = br->max_age = 20 * HZ;
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br->bridge_hello_time = br->hello_time = 2 * HZ;
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br->bridge_forward_delay = br->forward_delay = 15 * HZ;
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br->topology_change = 0;
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br->topology_change_detected = 0;
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br->ageing_time = 300 * HZ;
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INIT_LIST_HEAD(&br->age_list);
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br_stp_timer_init(br);
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return dev;
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}
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/* find an available port number */
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static int find_portno(struct net_bridge *br)
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{
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int index;
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struct net_bridge_port *p;
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unsigned long *inuse;
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inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
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GFP_KERNEL);
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if (!inuse)
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return -ENOMEM;
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set_bit(0, inuse); /* zero is reserved */
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list_for_each_entry(p, &br->port_list, list) {
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set_bit(p->port_no, inuse);
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}
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index = find_first_zero_bit(inuse, BR_MAX_PORTS);
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kfree(inuse);
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return (index >= BR_MAX_PORTS) ? -EXFULL : index;
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}
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/* called with RTNL but without bridge lock */
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static struct net_bridge_port *new_nbp(struct net_bridge *br,
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struct net_device *dev)
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{
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int index;
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struct net_bridge_port *p;
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index = find_portno(br);
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if (index < 0)
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return ERR_PTR(index);
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (p == NULL)
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return ERR_PTR(-ENOMEM);
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p->br = br;
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dev_hold(dev);
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p->dev = dev;
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p->path_cost = port_cost(dev);
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p->priority = 0x8000 >> BR_PORT_BITS;
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p->port_no = index;
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br_init_port(p);
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p->state = BR_STATE_DISABLED;
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INIT_WORK(&p->carrier_check, port_carrier_check, dev);
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br_stp_port_timer_init(p);
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kobject_init(&p->kobj);
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kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR);
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p->kobj.ktype = &brport_ktype;
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p->kobj.parent = &(dev->class_dev.kobj);
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p->kobj.kset = NULL;
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return p;
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}
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int br_add_bridge(const char *name)
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{
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struct net_device *dev;
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int ret;
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dev = new_bridge_dev(name);
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if (!dev)
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return -ENOMEM;
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rtnl_lock();
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if (strchr(dev->name, '%')) {
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ret = dev_alloc_name(dev, dev->name);
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if (ret < 0)
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goto err1;
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}
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ret = register_netdevice(dev);
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if (ret)
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goto err2;
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/* network device kobject is not setup until
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* after rtnl_unlock does it's hotplug magic.
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* so hold reference to avoid race.
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*/
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dev_hold(dev);
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rtnl_unlock();
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ret = br_sysfs_addbr(dev);
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dev_put(dev);
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if (ret)
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unregister_netdev(dev);
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out:
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return ret;
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err2:
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free_netdev(dev);
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err1:
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rtnl_unlock();
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goto out;
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}
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int br_del_bridge(const char *name)
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{
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struct net_device *dev;
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int ret = 0;
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rtnl_lock();
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dev = __dev_get_by_name(name);
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if (dev == NULL)
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ret = -ENXIO; /* Could not find device */
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else if (!(dev->priv_flags & IFF_EBRIDGE)) {
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/* Attempt to delete non bridge device! */
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ret = -EPERM;
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}
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else if (dev->flags & IFF_UP) {
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/* Not shutdown yet. */
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ret = -EBUSY;
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}
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else
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del_br(netdev_priv(dev));
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rtnl_unlock();
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return ret;
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}
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/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
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int br_min_mtu(const struct net_bridge *br)
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{
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const struct net_bridge_port *p;
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int mtu = 0;
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ASSERT_RTNL();
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if (list_empty(&br->port_list))
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mtu = ETH_DATA_LEN;
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else {
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list_for_each_entry(p, &br->port_list, list) {
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if (!mtu || p->dev->mtu < mtu)
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mtu = p->dev->mtu;
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}
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}
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return mtu;
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}
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/*
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* Recomputes features using slave's features
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*/
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void br_features_recompute(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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unsigned long features, checksum;
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features = br->feature_mask &~ NETIF_F_IP_CSUM;
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checksum = br->feature_mask & NETIF_F_IP_CSUM;
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list_for_each_entry(p, &br->port_list, list) {
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if (!(p->dev->features
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& (NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM)))
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checksum = 0;
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features &= p->dev->features;
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}
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br->dev->features = features | checksum | NETIF_F_LLTX;
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}
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/* called with RTNL */
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int br_add_if(struct net_bridge *br, struct net_device *dev)
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{
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struct net_bridge_port *p;
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int err = 0;
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if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
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return -EINVAL;
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if (dev->hard_start_xmit == br_dev_xmit)
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return -ELOOP;
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if (dev->br_port != NULL)
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return -EBUSY;
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p = new_nbp(br, dev);
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if (IS_ERR(p))
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return PTR_ERR(p);
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err = kobject_add(&p->kobj);
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if (err)
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goto err0;
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err = br_fdb_insert(br, p, dev->dev_addr);
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if (err)
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goto err1;
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err = br_sysfs_addif(p);
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if (err)
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goto err2;
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rcu_assign_pointer(dev->br_port, p);
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dev_set_promiscuity(dev, 1);
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list_add_rcu(&p->list, &br->port_list);
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spin_lock_bh(&br->lock);
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br_stp_recalculate_bridge_id(br);
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br_features_recompute(br);
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schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE);
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spin_unlock_bh(&br->lock);
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dev_set_mtu(br->dev, br_min_mtu(br));
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kobject_uevent(&p->kobj, KOBJ_ADD);
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return 0;
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err2:
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br_fdb_delete_by_port(br, p);
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err1:
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kobject_del(&p->kobj);
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err0:
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kobject_put(&p->kobj);
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return err;
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}
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/* called with RTNL */
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int br_del_if(struct net_bridge *br, struct net_device *dev)
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{
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struct net_bridge_port *p = dev->br_port;
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if (!p || p->br != br)
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return -EINVAL;
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del_nbp(p);
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spin_lock_bh(&br->lock);
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br_stp_recalculate_bridge_id(br);
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br_features_recompute(br);
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spin_unlock_bh(&br->lock);
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return 0;
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}
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void __exit br_cleanup_bridges(void)
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{
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struct net_device *dev, *nxt;
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rtnl_lock();
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for (dev = dev_base; dev; dev = nxt) {
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nxt = dev->next;
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if (dev->priv_flags & IFF_EBRIDGE)
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del_br(dev->priv);
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}
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rtnl_unlock();
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}
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