[mirror_ubuntu-hirsute-kernel.git] / net / hsr / hsr_main.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright 2011-2014 Autronica Fire and Security AS
 *
 * 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"
#include "hsr_slave.h"

static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
			     void *ptr)
{
	struct net_device *dev;
	struct hsr_port *port, *master;
	struct hsr_priv *hsr;
	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))
			hsr_del_port(port);
		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 res;

	BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);

	register_netdevice_notifier(&hsr_nb);
	res = hsr_netlink_init();

	return res;
}

static void __exit hsr_exit(void)
{
	unregister_netdevice_notifier(&hsr_nb);
	hsr_netlink_exit();
	hsr_debugfs_remove_root();
}

module_init(hsr_init);
module_exit(hsr_exit);
MODULE_LICENSE("GPL");
Commit	Line	Data
0e7623bd	1	// SPDX-License-Identifier: GPL-2.0
70ebe4a4	2	/* Copyright 2011-2014 Autronica Fire and Security AS
f421436a AB	3	*
f421436a AB	4	* Author(s):
70ebe4a4	5	* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
f421436a AB	6	*/
	7
	8	#include <linux/netdevice.h>
	9	#include <linux/rculist.h>
	10	#include <linux/timer.h>
	11	#include <linux/etherdevice.h>
	12	#include "hsr_main.h"
	13	#include "hsr_device.h"
	14	#include "hsr_netlink.h"
	15	#include "hsr_framereg.h"
51f3c605	16	#include "hsr_slave.h"
f421436a	17
f421436a AB	18	static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
	19	void *ptr)
	20	{
c5a75911 AB	21	struct net_device *dev;
c5a75911 AB	22	struct hsr_port port, master;
70ebe4a4	23	struct hsr_priv *hsr;
f421436a AB	24	int mtu_max;
f421436a AB	25	int res;
f421436a AB	26
f421436a AB	27	dev = netdev_notifier_info_to_dev(ptr);
c5a75911	28	port = hsr_port_get_rtnl(dev);
05ca6e64	29	if (!port) {
f421436a	30	if (!is_hsr_master(dev))
c5a75911	31	return NOTIFY_DONE; /* Not an HSR device */
70ebe4a4	32	hsr = netdev_priv(dev);
c5a75911	33	port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
05ca6e64	34	if (!port) {
56b08fdc AB	35	/* Resend of notification concerning removed device? */
	36	return NOTIFY_DONE;
	37	}
c5a75911 AB	38	} else {
c5a75911 AB	39	hsr = port->hsr;
f421436a AB	40	}
	41
	42	switch (event) {
	43	case NETDEV_UP: /* Administrative state DOWN */
	44	case NETDEV_DOWN: /* Administrative state UP */
	45	case NETDEV_CHANGE: /* Link (carrier) state changes */
e9aae56e	46	hsr_check_carrier_and_operstate(hsr);
f421436a	47	break;
4c2d5e33	48	case NETDEV_CHANGENAME:
04b69426 TY	49	if (is_hsr_master(dev))
04b69426 TY	50	hsr_debugfs_rename(dev);
4c2d5e33	51	break;
f421436a	52	case NETDEV_CHANGEADDR:
c5a75911 AB	53	if (port->type == HSR_PT_MASTER) {
	54	/* This should not happen since there's no
	55	* ndo_set_mac_address() for HSR devices - i.e. not
	56	* supported.
	57	*/
f421436a	58	break;
c5a75911	59	}
f421436a	60
c5a75911 AB	61	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
	62
	63	if (port->type == HSR_PT_SLAVE_A) {
	64	ether_addr_copy(master->dev->dev_addr, dev->dev_addr);
d595b85a MK	65	call_netdevice_notifiers(NETDEV_CHANGEADDR,
d595b85a MK	66	master->dev);
51f3c605	67	}
f421436a AB	68
f421436a AB	69	/* Make sure we recognize frames from ourselves in hsr_rcv() */
c5a75911	70	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
92a35678	71	res = hsr_create_self_node(hsr,
c5a75911 AB	72	master->dev->dev_addr,
	73	port ?
	74	port->dev->dev_addr :
	75	master->dev->dev_addr);
f421436a	76	if (res)
c5a75911	77	netdev_warn(master->dev,
f421436a	78	"Could not update HSR node address.\n");
f421436a AB	79	break;
f421436a AB	80	case NETDEV_CHANGEMTU:
c5a75911	81	if (port->type == HSR_PT_MASTER)
f421436a	82	break; /* Handled in ndo_change_mtu() */
c5a75911 AB	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;
f421436a AB	86	break;
f421436a AB	87	case NETDEV_UNREGISTER:
e0a4b997 TY	88	if (!is_hsr_master(dev))
e0a4b997 TY	89	hsr_del_port(port);
f421436a AB	90	break;
	91	case NETDEV_PRE_TYPE_CHANGE:
	92	/* HSR works only on Ethernet devices. Refuse slave to change
	93	* its type.
	94	*/
	95	return NOTIFY_BAD;
	96	}
	97
	98	return NOTIFY_DONE;
	99	}
	100
c5a75911 AB	101	struct 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
f421436a AB	111	static struct notifier_block hsr_nb = {
	112	.notifier_call = hsr_netdev_notify, /* Slave event notifications */
	113	};
	114
f421436a AB	115	static int __init hsr_init(void)
	116	{
	117	int res;
	118
70ebe4a4	119	BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
f421436a	120
f421436a	121	register_netdevice_notifier(&hsr_nb);
f421436a AB	122	res = hsr_netlink_init();
	123
	124	return res;
	125	}
	126
	127	static void __exit hsr_exit(void)
	128	{
	129	unregister_netdevice_notifier(&hsr_nb);
f421436a	130	hsr_netlink_exit();
c6c4ccd7	131	hsr_debugfs_remove_root();
f421436a AB	132	}
	133
	134	module_init(hsr_init);
	135	module_exit(hsr_exit);
	136	MODULE_LICENSE("GPL");