linux/net/bridge/br_sysfs_br.c
Stephen Hemminger fda93d92d7 [BRIDGE]: allow show/store of group multicast address
Bridge's communicate with each other using Spanning Tree Protocol
over a standard multicast address. There are times when testing or
layering bridges over existing topologies or tunnels, when it is
useful to use alternative multicast addresses for STP packets.

The 802.1d standard has some unused addresses, that can be used for this.
This patch is restrictive in that it only allows one of the possible
addresses in the standard.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 22:59:21 -08:00

415 lines
11 KiB
C

/*
* Sysfs attributes of bridge ports
* Linux ethernet bridge
*
* Authors:
* Stephen Hemminger <shemminger@osdl.org>
*
* 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/capability.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/if_bridge.h>
#include <linux/rtnetlink.h>
#include <linux/spinlock.h>
#include <linux/times.h>
#include "br_private.h"
#define to_class_dev(obj) container_of(obj,struct class_device,kobj)
#define to_net_dev(class) container_of(class, struct net_device, class_dev)
#define to_bridge(cd) ((struct net_bridge *)(to_net_dev(cd)->priv))
/*
* Common code for storing bridge parameters.
*/
static ssize_t store_bridge_parm(struct class_device *cd,
const char *buf, size_t len,
void (*set)(struct net_bridge *, unsigned long))
{
struct net_bridge *br = to_bridge(cd);
char *endp;
unsigned long val;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
val = simple_strtoul(buf, &endp, 0);
if (endp == buf)
return -EINVAL;
spin_lock_bh(&br->lock);
(*set)(br, val);
spin_unlock_bh(&br->lock);
return len;
}
static ssize_t show_forward_delay(struct class_device *cd, char *buf)
{
struct net_bridge *br = to_bridge(cd);
return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
}
static void set_forward_delay(struct net_bridge *br, unsigned long val)
{
unsigned long delay = clock_t_to_jiffies(val);
br->forward_delay = delay;
if (br_is_root_bridge(br))
br->bridge_forward_delay = delay;
}
static ssize_t store_forward_delay(struct class_device *cd, const char *buf,
size_t len)
{
return store_bridge_parm(cd, buf, len, set_forward_delay);
}
static CLASS_DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR,
show_forward_delay, store_forward_delay);
static ssize_t show_hello_time(struct class_device *cd, char *buf)
{
return sprintf(buf, "%lu\n",
jiffies_to_clock_t(to_bridge(cd)->hello_time));
}
static void set_hello_time(struct net_bridge *br, unsigned long val)
{
unsigned long t = clock_t_to_jiffies(val);
br->hello_time = t;
if (br_is_root_bridge(br))
br->bridge_hello_time = t;
}
static ssize_t store_hello_time(struct class_device *cd, const char *buf,
size_t len)
{
return store_bridge_parm(cd, buf, len, set_hello_time);
}
static CLASS_DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time,
store_hello_time);
static ssize_t show_max_age(struct class_device *cd, char *buf)
{
return sprintf(buf, "%lu\n",
jiffies_to_clock_t(to_bridge(cd)->max_age));
}
static void set_max_age(struct net_bridge *br, unsigned long val)
{
unsigned long t = clock_t_to_jiffies(val);
br->max_age = t;
if (br_is_root_bridge(br))
br->bridge_max_age = t;
}
static ssize_t store_max_age(struct class_device *cd, const char *buf,
size_t len)
{
return store_bridge_parm(cd, buf, len, set_max_age);
}
static CLASS_DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age,
store_max_age);
static ssize_t show_ageing_time(struct class_device *cd, char *buf)
{
struct net_bridge *br = to_bridge(cd);
return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
}
static void set_ageing_time(struct net_bridge *br, unsigned long val)
{
br->ageing_time = clock_t_to_jiffies(val);
}
static ssize_t store_ageing_time(struct class_device *cd, const char *buf,
size_t len)
{
return store_bridge_parm(cd, buf, len, set_ageing_time);
}
static CLASS_DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time,
store_ageing_time);
static ssize_t show_stp_state(struct class_device *cd, char *buf)
{
struct net_bridge *br = to_bridge(cd);
return sprintf(buf, "%d\n", br->stp_enabled);
}
static void set_stp_state(struct net_bridge *br, unsigned long val)
{
br->stp_enabled = val;
}
static ssize_t store_stp_state(struct class_device *cd,
const char *buf, size_t len)
{
return store_bridge_parm(cd, buf, len, set_stp_state);
}
static CLASS_DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
store_stp_state);
static ssize_t show_priority(struct class_device *cd, char *buf)
{
struct net_bridge *br = to_bridge(cd);
return sprintf(buf, "%d\n",
(br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
}
static void set_priority(struct net_bridge *br, unsigned long val)
{
br_stp_set_bridge_priority(br, (u16) val);
}
static ssize_t store_priority(struct class_device *cd,
const char *buf, size_t len)
{
return store_bridge_parm(cd, buf, len, set_priority);
}
static CLASS_DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority,
store_priority);
static ssize_t show_root_id(struct class_device *cd, char *buf)
{
return br_show_bridge_id(buf, &to_bridge(cd)->designated_root);
}
static CLASS_DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);
static ssize_t show_bridge_id(struct class_device *cd, char *buf)
{
return br_show_bridge_id(buf, &to_bridge(cd)->bridge_id);
}
static CLASS_DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);
static ssize_t show_root_port(struct class_device *cd, char *buf)
{
return sprintf(buf, "%d\n", to_bridge(cd)->root_port);
}
static CLASS_DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);
static ssize_t show_root_path_cost(struct class_device *cd, char *buf)
{
return sprintf(buf, "%d\n", to_bridge(cd)->root_path_cost);
}
static CLASS_DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);
static ssize_t show_topology_change(struct class_device *cd, char *buf)
{
return sprintf(buf, "%d\n", to_bridge(cd)->topology_change);
}
static CLASS_DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);
static ssize_t show_topology_change_detected(struct class_device *cd, char *buf)
{
struct net_bridge *br = to_bridge(cd);
return sprintf(buf, "%d\n", br->topology_change_detected);
}
static CLASS_DEVICE_ATTR(topology_change_detected, S_IRUGO, show_topology_change_detected, NULL);
static ssize_t show_hello_timer(struct class_device *cd, char *buf)
{
struct net_bridge *br = to_bridge(cd);
return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
}
static CLASS_DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);
static ssize_t show_tcn_timer(struct class_device *cd, char *buf)
{
struct net_bridge *br = to_bridge(cd);
return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
}
static CLASS_DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);
static ssize_t show_topology_change_timer(struct class_device *cd, char *buf)
{
struct net_bridge *br = to_bridge(cd);
return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
}
static CLASS_DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer, NULL);
static ssize_t show_gc_timer(struct class_device *cd, char *buf)
{
struct net_bridge *br = to_bridge(cd);
return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
}
static CLASS_DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);
static ssize_t show_group_addr(struct class_device *cd, char *buf)
{
struct net_bridge *br = to_bridge(cd);
return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
br->group_addr[0], br->group_addr[1],
br->group_addr[2], br->group_addr[3],
br->group_addr[4], br->group_addr[5]);
}
static ssize_t store_group_addr(struct class_device *cd, const char *buf,
size_t len)
{
struct net_bridge *br = to_bridge(cd);
unsigned new_addr[6];
int i;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (sscanf(buf, "%x:%x:%x:%x:%x:%x",
&new_addr[0], &new_addr[1], &new_addr[2],
&new_addr[3], &new_addr[4], &new_addr[5]) != 6)
return -EINVAL;
/* Must be 01:80:c2:00:00:0X */
for (i = 0; i < 5; i++)
if (new_addr[i] != br_group_address[i])
return -EINVAL;
if (new_addr[5] & ~0xf)
return -EINVAL;
if (new_addr[5] == 1 /* 802.3x Pause address */
|| new_addr[5] == 2 /* 802.3ad Slow protocols */
|| new_addr[5] == 3) /* 802.1X PAE address */
return -EINVAL;
spin_lock_bh(&br->lock);
for (i = 0; i < 6; i++)
br->group_addr[i] = new_addr[i];
spin_unlock_bh(&br->lock);
return len;
}
static CLASS_DEVICE_ATTR(group_addr, S_IRUGO | S_IWUSR,
show_group_addr, store_group_addr);
static struct attribute *bridge_attrs[] = {
&class_device_attr_forward_delay.attr,
&class_device_attr_hello_time.attr,
&class_device_attr_max_age.attr,
&class_device_attr_ageing_time.attr,
&class_device_attr_stp_state.attr,
&class_device_attr_priority.attr,
&class_device_attr_bridge_id.attr,
&class_device_attr_root_id.attr,
&class_device_attr_root_path_cost.attr,
&class_device_attr_root_port.attr,
&class_device_attr_topology_change.attr,
&class_device_attr_topology_change_detected.attr,
&class_device_attr_hello_timer.attr,
&class_device_attr_tcn_timer.attr,
&class_device_attr_topology_change_timer.attr,
&class_device_attr_gc_timer.attr,
&class_device_attr_group_addr.attr,
NULL
};
static struct attribute_group bridge_group = {
.name = SYSFS_BRIDGE_ATTR,
.attrs = bridge_attrs,
};
/*
* Export the forwarding information table as a binary file
* The records are struct __fdb_entry.
*
* Returns the number of bytes read.
*/
static ssize_t brforward_read(struct kobject *kobj, char *buf,
loff_t off, size_t count)
{
struct class_device *cdev = to_class_dev(kobj);
struct net_bridge *br = to_bridge(cdev);
int n;
/* must read whole records */
if (off % sizeof(struct __fdb_entry) != 0)
return -EINVAL;
n = br_fdb_fillbuf(br, buf,
count / sizeof(struct __fdb_entry),
off / sizeof(struct __fdb_entry));
if (n > 0)
n *= sizeof(struct __fdb_entry);
return n;
}
static struct bin_attribute bridge_forward = {
.attr = { .name = SYSFS_BRIDGE_FDB,
.mode = S_IRUGO,
.owner = THIS_MODULE, },
.read = brforward_read,
};
/*
* Add entries in sysfs onto the existing network class device
* for the bridge.
* Adds a attribute group "bridge" containing tuning parameters.
* Binary attribute containing the forward table
* Sub directory to hold links to interfaces.
*
* Note: the ifobj exists only to be a subdirectory
* to hold links. The ifobj exists in same data structure
* as it's parent the bridge so reference counting works.
*/
int br_sysfs_addbr(struct net_device *dev)
{
struct kobject *brobj = &dev->class_dev.kobj;
struct net_bridge *br = netdev_priv(dev);
int err;
err = sysfs_create_group(brobj, &bridge_group);
if (err) {
pr_info("%s: can't create group %s/%s\n",
__FUNCTION__, dev->name, bridge_group.name);
goto out1;
}
err = sysfs_create_bin_file(brobj, &bridge_forward);
if (err) {
pr_info("%s: can't create attribue file %s/%s\n",
__FUNCTION__, dev->name, bridge_forward.attr.name);
goto out2;
}
kobject_set_name(&br->ifobj, SYSFS_BRIDGE_PORT_SUBDIR);
br->ifobj.ktype = NULL;
br->ifobj.kset = NULL;
br->ifobj.parent = brobj;
err = kobject_register(&br->ifobj);
if (err) {
pr_info("%s: can't add kobject (directory) %s/%s\n",
__FUNCTION__, dev->name, br->ifobj.name);
goto out3;
}
return 0;
out3:
sysfs_remove_bin_file(&dev->class_dev.kobj, &bridge_forward);
out2:
sysfs_remove_group(&dev->class_dev.kobj, &bridge_group);
out1:
return err;
}
void br_sysfs_delbr(struct net_device *dev)
{
struct kobject *kobj = &dev->class_dev.kobj;
struct net_bridge *br = netdev_priv(dev);
kobject_unregister(&br->ifobj);
sysfs_remove_bin_file(kobj, &bridge_forward);
sysfs_remove_group(kobj, &bridge_group);
}