1/* Copyright 2011-2014 Autronica Fire and Security AS
2 *
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)
6 * any later version.
7 *
8 * Author(s):
9 *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
10 */
11
12#include <linux/netdevice.h>
13#include <linux/rculist.h>
14#include <linux/timer.h>
15#include <linux/etherdevice.h>
16#include "hsr_main.h"
17#include "hsr_device.h"
18#include "hsr_netlink.h"
19#include "hsr_framereg.h"
20#include "hsr_slave.h"
21
22
23static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
24			     void *ptr)
25{
26	struct net_device *dev;
27	struct hsr_port *port, *master;
28	struct hsr_priv *hsr;
29	int mtu_max;
30	int res;
31
32	dev = netdev_notifier_info_to_dev(ptr);
33	port = hsr_port_get_rtnl(dev);
34	if (port == NULL) {
35		if (!is_hsr_master(dev))
36			return NOTIFY_DONE;	/* Not an HSR device */
37		hsr = netdev_priv(dev);
38		port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
39	} else {
40		hsr = port->hsr;
41	}
42
43	switch (event) {
44	case NETDEV_UP:		/* Administrative state DOWN */
45	case NETDEV_DOWN:	/* Administrative state UP */
46	case NETDEV_CHANGE:	/* Link (carrier) state changes */
47		hsr_check_carrier_and_operstate(hsr);
48		break;
49	case NETDEV_CHANGEADDR:
50		if (port->type == HSR_PT_MASTER) {
51			/* This should not happen since there's no
52			 * ndo_set_mac_address() for HSR devices - i.e. not
53			 * supported.
54			 */
55			break;
56		}
57
58		master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
59
60		if (port->type == HSR_PT_SLAVE_A) {
61			ether_addr_copy(master->dev->dev_addr, dev->dev_addr);
62			call_netdevice_notifiers(NETDEV_CHANGEADDR, master->dev);
63		}
64
65		/* Make sure we recognize frames from ourselves in hsr_rcv() */
66		port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
67		res = hsr_create_self_node(&hsr->self_node_db,
68					   master->dev->dev_addr,
69					   port ?
70						port->dev->dev_addr :
71						master->dev->dev_addr);
72		if (res)
73			netdev_warn(master->dev,
74				    "Could not update HSR node address.\n");
75		break;
76	case NETDEV_CHANGEMTU:
77		if (port->type == HSR_PT_MASTER)
78			break; /* Handled in ndo_change_mtu() */
79		mtu_max = hsr_get_max_mtu(port->hsr);
80		master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
81		master->dev->mtu = mtu_max;
82		break;
83	case NETDEV_UNREGISTER:
84		hsr_del_port(port);
85		break;
86	case NETDEV_PRE_TYPE_CHANGE:
87		/* HSR works only on Ethernet devices. Refuse slave to change
88		 * its type.
89		 */
90		return NOTIFY_BAD;
91	}
92
93	return NOTIFY_DONE;
94}
95
96
97struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt)
98{
99	struct hsr_port *port;
100
101	hsr_for_each_port(hsr, port)
102		if (port->type == pt)
103			return port;
104	return NULL;
105}
106
107static struct notifier_block hsr_nb = {
108	.notifier_call = hsr_netdev_notify,	/* Slave event notifications */
109};
110
111
112static int __init hsr_init(void)
113{
114	int res;
115
116	BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
117
118	register_netdevice_notifier(&hsr_nb);
119	res = hsr_netlink_init();
120
121	return res;
122}
123
124static void __exit hsr_exit(void)
125{
126	unregister_netdevice_notifier(&hsr_nb);
127	hsr_netlink_exit();
128}
129
130module_init(hsr_init);
131module_exit(hsr_exit);
132MODULE_LICENSE("GPL");
133