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// SPDX-License-Identifier: GPL-2.0
/* Copyright 2011-2014 Autronica Fire and Security AS
*
* Author(s):
* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
*
* Event handling for HSR and PRP devices.
*/
#include <linux/netdevice.h>
#include <net/rtnetlink.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"
#include "hsr_slave.h"
static bool hsr_slave_empty(struct hsr_priv *hsr)
{
struct hsr_port *port;
hsr_for_each_port(hsr, port)
if (port->type != HSR_PT_MASTER)
return false;
return true;
}
static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
void *ptr)
{
struct hsr_port *port, *master;
struct net_device *dev;
struct hsr_priv *hsr;
LIST_HEAD(list_kill);
int mtu_max;
int res;
dev = netdev_notifier_info_to_dev(ptr);
port = hsr_port_get_rtnl(dev);
if (!port) {
if (!is_hsr_master(dev))
return NOTIFY_DONE; /* Not an HSR device */
hsr = netdev_priv(dev);
port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
if (!port) {
/* Resend of notification concerning removed device? */
return NOTIFY_DONE;
}
} else {
hsr = port->hsr;
}
switch (event) {
case NETDEV_UP: /* Administrative state DOWN */
case NETDEV_DOWN: /* Administrative state UP */
case NETDEV_CHANGE: /* Link (carrier) state changes */
hsr_check_carrier_and_operstate(hsr);
break;
case NETDEV_CHANGENAME:
if (is_hsr_master(dev))
hsr_debugfs_rename(dev);
break;
case NETDEV_CHANGEADDR:
if (port->type == HSR_PT_MASTER) {
/* This should not happen since there's no
* ndo_set_mac_address() for HSR devices - i.e. not
* supported.
*/
break;
}
master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
if (port->type == HSR_PT_SLAVE_A) {
ether_addr_copy(master->dev->dev_addr, dev->dev_addr);
call_netdevice_notifiers(NETDEV_CHANGEADDR,
master->dev);
}
/* Make sure we recognize frames from ourselves in hsr_rcv() */
port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
res = hsr_create_self_node(hsr,
master->dev->dev_addr,
port ?
port->dev->dev_addr :
master->dev->dev_addr);
if (res)
netdev_warn(master->dev,
"Could not update HSR node address.\n");
break;
case NETDEV_CHANGEMTU:
if (port->type == HSR_PT_MASTER)
break; /* Handled in ndo_change_mtu() */
mtu_max = hsr_get_max_mtu(port->hsr);
master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
master->dev->mtu = mtu_max;
break;
case NETDEV_UNREGISTER:
if (!is_hsr_master(dev)) {
master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
hsr_del_port(port);
if (hsr_slave_empty(master->hsr)) {
const struct rtnl_link_ops *ops;
ops = master->dev->rtnl_link_ops;
ops->dellink(master->dev, &list_kill);
unregister_netdevice_many(&list_kill);
}
}
break;
case NETDEV_PRE_TYPE_CHANGE:
/* HSR works only on Ethernet devices. Refuse slave to change
* its type.
*/
return NOTIFY_BAD;
}
return NOTIFY_DONE;
}
struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt)
{
struct hsr_port *port;
hsr_for_each_port(hsr, port)
if (port->type == pt)
return port;
return NULL;
}
static struct notifier_block hsr_nb = {
.notifier_call = hsr_netdev_notify, /* Slave event notifications */
};
static int __init hsr_init(void)
{
int err;
BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
err = register_netdevice_notifier(&hsr_nb);
if (err)
return err;
err = hsr_netlink_init();
if (err) {
unregister_netdevice_notifier(&hsr_nb);
return err;
}
return 0;
}
static void __exit hsr_exit(void)
{
hsr_netlink_exit();
hsr_debugfs_remove_root();
unregister_netdevice_notifier(&hsr_nb);
}
module_init(hsr_init);
module_exit(hsr_exit);
MODULE_LICENSE("GPL");
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