1 /* Copyright 2011-2014 Autronica Fire and Security AS
3 * This program is free software; you can redistribute it and/or modify it
4 * under the terms of the GNU General Public License as published by the Free
5 * Software Foundation; either version 2 of the License, or (at your option)
9 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se
12 #include <linux/netdevice.h>
13 #include <linux/rculist.h>
14 #include <linux/timer.h>
15 #include <linux/etherdevice.h>
17 #include "hsr_device.h"
18 #include "hsr_netlink.h"
19 #include "hsr_framereg.h"
22 /* List of all registered virtual HSR devices */
23 static LIST_HEAD(hsr_list);
25 void register_hsr_master(struct hsr_priv *hsr)
27 list_add_tail_rcu(&hsr->hsr_list, &hsr_list);
30 void unregister_hsr_master(struct hsr_priv *hsr)
32 struct hsr_priv *hsr_it;
34 list_for_each_entry(hsr_it, &hsr_list, hsr_list)
36 list_del_rcu(&hsr_it->hsr_list);
41 bool is_hsr_slave(struct net_device *dev)
43 struct hsr_priv *hsr_it;
45 list_for_each_entry_rcu(hsr_it, &hsr_list, hsr_list) {
46 if (dev == hsr_it->slave[0])
48 if (dev == hsr_it->slave[1])
55 /* If dev is a HSR slave device, return the virtual master device. Return NULL
58 struct hsr_priv *get_hsr_master(struct net_device *dev)
63 list_for_each_entry_rcu(hsr, &hsr_list, hsr_list)
64 if ((dev == hsr->slave[0]) ||
65 (dev == hsr->slave[1])) {
74 /* If dev is a HSR slave device, return the other slave device. Return NULL
77 struct net_device *get_other_slave(struct hsr_priv *hsr,
78 struct net_device *dev)
80 if (dev == hsr->slave[0])
82 if (dev == hsr->slave[1])
89 static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
92 struct net_device *slave, *other_slave;
97 struct net_device *dev;
99 dev = netdev_notifier_info_to_dev(ptr);
101 hsr = get_hsr_master(dev);
103 /* dev is a slave device */
105 other_slave = get_other_slave(hsr, slave);
107 if (!is_hsr_master(dev))
109 hsr = netdev_priv(dev);
110 slave = hsr->slave[0];
111 other_slave = hsr->slave[1];
115 case NETDEV_UP: /* Administrative state DOWN */
116 case NETDEV_DOWN: /* Administrative state UP */
117 case NETDEV_CHANGE: /* Link (carrier) state changes */
118 old_operstate = hsr->dev->operstate;
119 hsr_set_carrier(hsr->dev, slave, other_slave);
120 /* netif_stacked_transfer_operstate() cannot be used here since
121 * it doesn't set IF_OPER_LOWERLAYERDOWN (?)
123 hsr_set_operstate(hsr->dev, slave, other_slave);
124 hsr_check_announce(hsr->dev, old_operstate);
126 case NETDEV_CHANGEADDR:
128 /* This should not happen since there's no ndo_set_mac_address()
129 * for HSR devices - i.e. not supported.
134 if (dev == hsr->slave[0])
135 ether_addr_copy(hsr->dev->dev_addr,
136 hsr->slave[0]->dev_addr);
138 /* Make sure we recognize frames from ourselves in hsr_rcv() */
139 res = hsr_create_self_node(&hsr->self_node_db,
142 hsr->slave[1]->dev_addr :
145 netdev_warn(hsr->dev,
146 "Could not update HSR node address.\n");
148 if (dev == hsr->slave[0])
149 call_netdevice_notifiers(NETDEV_CHANGEADDR, hsr->dev);
151 case NETDEV_CHANGEMTU:
153 break; /* Handled in ndo_change_mtu() */
154 mtu_max = hsr_get_max_mtu(hsr);
155 if (hsr->dev->mtu > mtu_max)
156 dev_set_mtu(hsr->dev, mtu_max);
158 case NETDEV_UNREGISTER:
159 if (dev == hsr->slave[0])
160 hsr->slave[0] = NULL;
161 if (dev == hsr->slave[1])
162 hsr->slave[1] = NULL;
164 /* There should really be a way to set a new slave device... */
167 case NETDEV_PRE_TYPE_CHANGE:
168 /* HSR works only on Ethernet devices. Refuse slave to change
178 static struct timer_list prune_timer;
180 static void prune_nodes_all(unsigned long data)
182 struct hsr_priv *hsr;
185 list_for_each_entry_rcu(hsr, &hsr_list, hsr_list)
186 hsr_prune_nodes(hsr);
189 prune_timer.expires = jiffies + msecs_to_jiffies(PRUNE_PERIOD);
190 add_timer(&prune_timer);
194 static struct notifier_block hsr_nb = {
195 .notifier_call = hsr_netdev_notify, /* Slave event notifications */
199 static int __init hsr_init(void)
203 BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
205 init_timer(&prune_timer);
206 prune_timer.function = prune_nodes_all;
207 prune_timer.data = 0;
208 prune_timer.expires = jiffies + msecs_to_jiffies(PRUNE_PERIOD);
209 add_timer(&prune_timer);
211 register_netdevice_notifier(&hsr_nb);
213 res = hsr_netlink_init();
218 static void __exit hsr_exit(void)
220 unregister_netdevice_notifier(&hsr_nb);
221 del_timer_sync(&prune_timer);
225 module_init(hsr_init);
226 module_exit(hsr_exit);
227 MODULE_LICENSE("GPL");