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/* Copyright 2011-2014 Autronica Fire and Security AS
*
* 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.
*
* Author(s):
* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
*/
#include <linux/netdevice.h>
#include <linux/rculist.h>
#include <linux/timer.h>
#include <linux/etherdevice.h>
#include "hsr_main.h"
#include "hsr_device.h"
#include "hsr_netlink.h"
#include "hsr_framereg.h"
/* List of all registered virtual HSR devices */
static LIST_HEAD(hsr_list);
void register_hsr_master(struct hsr_priv *hsr)
{
list_add_tail_rcu(&hsr->hsr_list, &hsr_list);
}
void unregister_hsr_master(struct hsr_priv *hsr)
{
struct hsr_priv *hsr_it;
list_for_each_entry(hsr_it, &hsr_list, hsr_list)
if (hsr_it == hsr) {
list_del_rcu(&hsr_it->hsr_list);
return;
}
}
bool is_hsr_slave(struct net_device *dev)
{
struct hsr_priv *hsr_it;
list_for_each_entry_rcu(hsr_it, &hsr_list, hsr_list) {
if (dev == hsr_it->slave[0])
return true;
if (dev == hsr_it->slave[1])
return true;
}
return false;
}
/* If dev is a HSR slave device, return the virtual master device. Return NULL
* otherwise.
*/
struct hsr_priv *get_hsr_master(struct net_device *dev)
{
struct hsr_priv *hsr;
rcu_read_lock();
list_for_each_entry_rcu(hsr, &hsr_list, hsr_list)
if ((dev == hsr->slave[0]) ||
(dev == hsr->slave[1])) {
rcu_read_unlock();
return hsr;
}
rcu_read_unlock();
return NULL;
}
/* If dev is a HSR slave device, return the other slave device. Return NULL
* otherwise.
*/
struct net_device *get_other_slave(struct hsr_priv *hsr,
struct net_device *dev)
{
if (dev == hsr->slave[0])
return hsr->slave[1];
if (dev == hsr->slave[1])
return hsr->slave[0];
return NULL;
}
static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
void *ptr)
{
struct net_device *slave, *other_slave;
struct hsr_priv *hsr;
int old_operstate;
int mtu_max;
int res;
struct net_device *dev;
dev = netdev_notifier_info_to_dev(ptr);
hsr = get_hsr_master(dev);
if (hsr) {
/* dev is a slave device */
slave = dev;
other_slave = get_other_slave(hsr, slave);
} else {
if (!is_hsr_master(dev))
return NOTIFY_DONE;
hsr = netdev_priv(dev);
slave = hsr->slave[0];
other_slave = hsr->slave[1];
}
switch (event) {
case NETDEV_UP: /* Administrative state DOWN */
case NETDEV_DOWN: /* Administrative state UP */
case NETDEV_CHANGE: /* Link (carrier) state changes */
old_operstate = hsr->dev->operstate;
hsr_set_carrier(hsr->dev, slave, other_slave);
/* netif_stacked_transfer_operstate() cannot be used here since
* it doesn't set IF_OPER_LOWERLAYERDOWN (?)
*/
hsr_set_operstate(hsr->dev, slave, other_slave);
hsr_check_announce(hsr->dev, old_operstate);
break;
case NETDEV_CHANGEADDR:
/* This should not happen since there's no ndo_set_mac_address()
* for HSR devices - i.e. not supported.
*/
if (dev == hsr->dev)
break;
if (dev == hsr->slave[0])
ether_addr_copy(hsr->dev->dev_addr,
hsr->slave[0]->dev_addr);
/* Make sure we recognize frames from ourselves in hsr_rcv() */
res = hsr_create_self_node(&hsr->self_node_db,
hsr->dev->dev_addr,
hsr->slave[1] ?
hsr->slave[1]->dev_addr :
hsr->dev->dev_addr);
if (res)
netdev_warn(hsr->dev,
"Could not update HSR node address.\n");
if (dev == hsr->slave[0])
call_netdevice_notifiers(NETDEV_CHANGEADDR, hsr->dev);
break;
case NETDEV_CHANGEMTU:
if (dev == hsr->dev)
break; /* Handled in ndo_change_mtu() */
mtu_max = hsr_get_max_mtu(hsr);
if (hsr->dev->mtu > mtu_max)
dev_set_mtu(hsr->dev, mtu_max);
break;
case NETDEV_UNREGISTER:
if (dev == hsr->slave[0])
hsr->slave[0] = NULL;
if (dev == hsr->slave[1])
hsr->slave[1] = NULL;
/* There should really be a way to set a new slave device... */
break;
case NETDEV_PRE_TYPE_CHANGE:
/* HSR works only on Ethernet devices. Refuse slave to change
* its type.
*/
return NOTIFY_BAD;
}
return NOTIFY_DONE;
}
static struct timer_list prune_timer;
static void prune_nodes_all(unsigned long data)
{
struct hsr_priv *hsr;
rcu_read_lock();
list_for_each_entry_rcu(hsr, &hsr_list, hsr_list)
hsr_prune_nodes(hsr);
rcu_read_unlock();
prune_timer.expires = jiffies + msecs_to_jiffies(PRUNE_PERIOD);
add_timer(&prune_timer);
}
static struct notifier_block hsr_nb = {
.notifier_call = hsr_netdev_notify, /* Slave event notifications */
};
static int __init hsr_init(void)
{
int res;
BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
init_timer(&prune_timer);
prune_timer.function = prune_nodes_all;
prune_timer.data = 0;
prune_timer.expires = jiffies + msecs_to_jiffies(PRUNE_PERIOD);
add_timer(&prune_timer);
register_netdevice_notifier(&hsr_nb);
res = hsr_netlink_init();
return res;
}
static void __exit hsr_exit(void)
{
unregister_netdevice_notifier(&hsr_nb);
del_timer_sync(&prune_timer);
hsr_netlink_exit();
}
module_init(hsr_init);
module_exit(hsr_exit);
MODULE_LICENSE("GPL");
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