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		if (port == NULL) {
40			/* Resend of notification concerning removed device? */
41			return NOTIFY_DONE;
42		}
43	} else {
44		hsr = port->hsr;
45	}
46
47	switch (event) {
48	case NETDEV_UP:		/* Administrative state DOWN */
49	case NETDEV_DOWN:	/* Administrative state UP */
50	case NETDEV_CHANGE:	/* Link (carrier) state changes */
51		hsr_check_carrier_and_operstate(hsr);
52		break;
53	case NETDEV_CHANGEADDR:
54		if (port->type == HSR_PT_MASTER) {
55			/* This should not happen since there's no
56			 * ndo_set_mac_address() for HSR devices - i.e. not
57			 * supported.
58			 */
59			break;
60		}
61
62		master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
63
64		if (port->type == HSR_PT_SLAVE_A) {
65			ether_addr_copy(master->dev->dev_addr, dev->dev_addr);
66			call_netdevice_notifiers(NETDEV_CHANGEADDR, master->dev);
67		}
68
69		/* Make sure we recognize frames from ourselves in hsr_rcv() */
70		port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
71		res = hsr_create_self_node(&hsr->self_node_db,
72					   master->dev->dev_addr,
73					   port ?
74						port->dev->dev_addr :
75						master->dev->dev_addr);
76		if (res)
77			netdev_warn(master->dev,
78				    "Could not update HSR node address.\n");
79		break;
80	case NETDEV_CHANGEMTU:
81		if (port->type == HSR_PT_MASTER)
82			break; /* Handled in ndo_change_mtu() */
83		mtu_max = hsr_get_max_mtu(port->hsr);
84		master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
85		master->dev->mtu = mtu_max;
86		break;
87	case NETDEV_UNREGISTER:
88		hsr_del_port(port);
89		break;
90	case NETDEV_PRE_TYPE_CHANGE:
91		/* HSR works only on Ethernet devices. Refuse slave to change
92		 * its type.
93		 */
94		return NOTIFY_BAD;
95	}
96
97	return NOTIFY_DONE;
98}
99
100
101struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt)
102{
103	struct hsr_port *port;
104
105	hsr_for_each_port(hsr, port)
106		if (port->type == pt)
107			return port;
108	return NULL;
109}
110
111static struct notifier_block hsr_nb = {
112	.notifier_call = hsr_netdev_notify,	/* Slave event notifications */
113};
114
115
116static int __init hsr_init(void)
117{
118	int res;
119
120	BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
121
122	register_netdevice_notifier(&hsr_nb);
123	res = hsr_netlink_init();
124
125	return res;
126}
127
128static void __exit hsr_exit(void)
129{
130	unregister_netdevice_notifier(&hsr_nb);
131	hsr_netlink_exit();
132}
133
134module_init(hsr_init);
135module_exit(hsr_exit);
136MODULE_LICENSE("GPL");
137