412 строки
8.1 KiB
C
412 строки
8.1 KiB
C
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* Recomputes features using slave's features
|
|
*/
|
|
void br_features_recompute(struct net_bridge *br)
|
|
{
|
|
struct net_bridge_port *p;
|
|
unsigned long features, checksum;
|
|
|
|
features = NETIF_F_SG | NETIF_F_FRAGLIST
|
|
| NETIF_F_HIGHDMA | NETIF_F_TSO;
|
|
checksum = NETIF_F_IP_CSUM; /* least commmon subset */
|
|
|
|
list_for_each_entry(p, &br->port_list, list) {
|
|
if (!(p->dev->features
|
|
& (NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM)))
|
|
checksum = 0;
|
|
features &= p->dev->features;
|
|
}
|
|
|
|
br->dev->features = features | checksum | NETIF_F_LLTX;
|
|
}
|
|
|
|
/* 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);
|
|
br_features_recompute(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();
|
|
|
|
}
|