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/*
* Userspace interface
* Linux ethernet bridge
*
* Authors:
* Lennert Buytenhek <buytenh@gnu.org>
*
* $Id: br_if.c,v 1.6.2.1 2001/12/24 00:59:27 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/if_arp.h>
#include <linux/if_bridge.h>
#include <linux/inetdevice.h>
#include <linux/rtnetlink.h>
#include <asm/uaccess.h>
#include "br_private.h"
static struct net_bridge *bridge_list;
static int br_initial_port_cost(struct net_device *dev)
{
if (!strncmp(dev->name, "lec", 3))
return 7;
if (!strncmp(dev->name, "eth", 3))
return 100; /* FIXME handle 100Mbps */
if (!strncmp(dev->name, "plip", 4))
return 2500;
return 100;
}
/* called under bridge lock */
static int __br_del_if(struct net_bridge *br, struct net_device *dev)
{
struct net_bridge_port *p;
struct net_bridge_port **pptr;
if ((p = dev->br_port) == NULL)
return -EINVAL;
br_stp_disable_port(p);
dev_set_promiscuity(dev, -1);
dev->br_port = NULL;
pptr = &br->port_list;
while (*pptr != NULL) {
if (*pptr == p) {
*pptr = p->next;
break;
}
pptr = &((*pptr)->next);
}
br_fdb_delete_by_port(br, p);
kfree(p);
dev_put(dev);
return 0;
}
static struct net_bridge **__find_br(char *name)
{
struct net_bridge **b;
struct net_bridge *br;
b = &bridge_list;
while ((br = *b) != NULL) {
if (!strncmp(br->dev.name, name, IFNAMSIZ))
return b;
b = &(br->next);
}
return NULL;
}
static void del_ifs(struct net_bridge *br)
{
write_lock_bh(&br->lock);
while (br->port_list != NULL)
__br_del_if(br, br->port_list->dev);
write_unlock_bh(&br->lock);
}
static struct net_bridge *new_nb(char *name)
{
struct net_bridge *br;
struct net_device *dev;
if ((br = kmalloc(sizeof(*br), GFP_KERNEL)) == NULL)
return NULL;
memset(br, 0, sizeof(*br));
dev = &br->dev;
strncpy(dev->name, name, IFNAMSIZ);
dev->priv = br;
ether_setup(dev);
br_dev_setup(dev);
br->lock = RW_LOCK_UNLOCKED;
br->hash_lock = RW_LOCK_UNLOCKED;
br->bridge_id.prio[0] = 0x80;
br->bridge_id.prio[1] = 0x00;
memset(br->bridge_id.addr, 0, ETH_ALEN);
br->stp_enabled = 1;
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_timer_clear(&br->hello_timer);
br_timer_clear(&br->tcn_timer);
br_timer_clear(&br->topology_change_timer);
br->ageing_time = 300 * HZ;
br->gc_interval = 4 * HZ;
return br;
}
/* called under bridge lock */
static struct net_bridge_port *new_nbp(struct net_bridge *br, struct net_device *dev)
{
int i;
struct net_bridge_port *p;
p = kmalloc(sizeof(*p), GFP_KERNEL);
if (p == NULL)
return p;
memset(p, 0, sizeof(*p));
p->br = br;
p->dev = dev;
p->path_cost = br_initial_port_cost(dev);
p->priority = 0x80;
dev->br_port = p;
for (i=1;i<255;i++)
if (br_get_port(br, i) == NULL)
break;
if (i == 255) {
kfree(p);
return NULL;
}
p->port_no = i;
br_init_port(p);
p->state = BR_STATE_DISABLED;
p->next = br->port_list;
br->port_list = p;
return p;
}
int br_add_bridge(char *name)
{
struct net_bridge *br;
if ((br = new_nb(name)) == NULL)
return -ENOMEM;
if (__dev_get_by_name(name) != NULL) {
kfree(br);
return -EEXIST;
}
br->next = bridge_list;
bridge_list = br;
br_inc_use_count();
register_netdev(&br->dev);
return 0;
}
int br_del_bridge(char *name)
{
struct net_bridge **b;
struct net_bridge *br;
if ((b = __find_br(name)) == NULL)
return -ENXIO;
br = *b;
if (br->dev.flags & IFF_UP)
return -EBUSY;
del_ifs(br);
*b = br->next;
unregister_netdev(&br->dev);
kfree(br);
br_dec_use_count();
return 0;
}
int br_add_if(struct net_bridge *br, struct net_device *dev)
{
struct net_bridge_port *p;
if (dev->br_port != NULL)
return -EBUSY;
if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
return -EINVAL;
if (dev->hard_start_xmit == br_dev_xmit)
return -ELOOP;
dev_hold(dev);
write_lock_bh(&br->lock);
if ((p = new_nbp(br, dev)) == NULL) {
write_unlock_bh(&br->lock);
dev_put(dev);
return -EXFULL;
}
dev_set_promiscuity(dev, 1);
br_stp_recalculate_bridge_id(br);
br_fdb_insert(br, p, dev->dev_addr, 1);
if ((br->dev.flags & IFF_UP) && (dev->flags & IFF_UP))
br_stp_enable_port(p);
write_unlock_bh(&br->lock);
return 0;
}
int br_del_if(struct net_bridge *br, struct net_device *dev)
{
int retval;
write_lock_bh(&br->lock);
retval = __br_del_if(br, dev);
br_stp_recalculate_bridge_id(br);
write_unlock_bh(&br->lock);
return retval;
}
int br_get_bridge_ifindices(int *indices, int num)
{
struct net_bridge *br;
int i;
br = bridge_list;
for (i=0;i<num;i++) {
if (br == NULL)
break;
indices[i] = br->dev.ifindex;
br = br->next;
}
return i;
}
/* called under ioctl_lock */
void br_get_port_ifindices(struct net_bridge *br, int *ifindices)
{
struct net_bridge_port *p;
p = br->port_list;
while (p != NULL) {
ifindices[p->port_no] = p->dev->ifindex;
p = p->next;
}
}
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