[deliverable/linux.git] / net / bridge / br.c

/*
 *	Generic parts
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/llc.h>
#include <net/llc.h>
#include <net/stp.h>

#include "br_private.h"

/*
 * Handle changes in state of network devices enslaved to a bridge.
 *
 * Note: don't care about up/down if bridge itself is down, because
 *     port state is checked when bridge is brought up.
 */
static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	struct net_bridge_port *p;
	struct net_bridge *br;
	bool changed_addr;
	int err;

	/* register of bridge completed, add sysfs entries */
	if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
		br_sysfs_addbr(dev);
		return NOTIFY_DONE;
	}

	/* not a port of a bridge */
	p = br_port_get_rtnl(dev);
	if (!p)
		return NOTIFY_DONE;

	br = p->br;

	switch (event) {
	case NETDEV_CHANGEMTU:
		dev_set_mtu(br->dev, br_min_mtu(br));
		break;

	case NETDEV_CHANGEADDR:
		spin_lock_bh(&br->lock);
		br_fdb_changeaddr(p, dev->dev_addr);
		changed_addr = br_stp_recalculate_bridge_id(br);
		spin_unlock_bh(&br->lock);

		if (changed_addr)
			call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);

		break;

	case NETDEV_CHANGE:
		br_port_carrier_check(p);
		break;

	case NETDEV_FEAT_CHANGE:
		netdev_update_features(br->dev);
		break;

	case NETDEV_DOWN:
		spin_lock_bh(&br->lock);
		if (br->dev->flags & IFF_UP)
			br_stp_disable_port(p);
		spin_unlock_bh(&br->lock);
		break;

	case NETDEV_UP:
		if (netif_running(br->dev) && netif_oper_up(dev)) {
			spin_lock_bh(&br->lock);
			br_stp_enable_port(p);
			spin_unlock_bh(&br->lock);
		}
		break;

	case NETDEV_UNREGISTER:
		br_del_if(br, dev);
		break;

	case NETDEV_CHANGENAME:
		err = br_sysfs_renameif(p);
		if (err)
			return notifier_from_errno(err);
		break;

	case NETDEV_PRE_TYPE_CHANGE:
		/* Forbid underlaying device to change its type. */
		return NOTIFY_BAD;

	case NETDEV_RESEND_IGMP:
		/* Propagate to master device */
		call_netdevice_notifiers(event, br->dev);
		break;
	}

	/* Events that may cause spanning tree to refresh */
	if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
	    event == NETDEV_CHANGE || event == NETDEV_DOWN)
		br_ifinfo_notify(RTM_NEWLINK, p);

	return NOTIFY_DONE;
}

static struct notifier_block br_device_notifier = {
	.notifier_call = br_device_event
};

static void __net_exit br_net_exit(struct net *net)
{
	struct net_device *dev;
	LIST_HEAD(list);

	rtnl_lock();
	for_each_netdev(net, dev)
		if (dev->priv_flags & IFF_EBRIDGE)
			br_dev_delete(dev, &list);

	unregister_netdevice_many(&list);
	rtnl_unlock();

}

static struct pernet_operations br_net_ops = {
	.exit	= br_net_exit,
};

static const struct stp_proto br_stp_proto = {
	.rcv	= br_stp_rcv,
};

static int __init br_init(void)
{
	int err;

	err = stp_proto_register(&br_stp_proto);
	if (err < 0) {
		pr_err("bridge: can't register sap for STP\n");
		return err;
	}

	err = br_fdb_init();
	if (err)
		goto err_out;

	err = register_pernet_subsys(&br_net_ops);
	if (err)
		goto err_out1;

	err = br_netfilter_init();
	if (err)
		goto err_out2;

	err = register_netdevice_notifier(&br_device_notifier);
	if (err)
		goto err_out3;

	err = br_netlink_init();
	if (err)
		goto err_out4;

	brioctl_set(br_ioctl_deviceless_stub);

#if IS_ENABLED(CONFIG_ATM_LANE)
	br_fdb_test_addr_hook = br_fdb_test_addr;
#endif

	return 0;
err_out4:
	unregister_netdevice_notifier(&br_device_notifier);
err_out3:
	br_netfilter_fini();
err_out2:
	unregister_pernet_subsys(&br_net_ops);
err_out1:
	br_fdb_fini();
err_out:
	stp_proto_unregister(&br_stp_proto);
	return err;
}

static void __exit br_deinit(void)
{
	stp_proto_unregister(&br_stp_proto);

	br_netlink_fini();
	unregister_netdevice_notifier(&br_device_notifier);
	brioctl_set(NULL);

	unregister_pernet_subsys(&br_net_ops);

	rcu_barrier(); /* Wait for completion of call_rcu()'s */

	br_netfilter_fini();
#if IS_ENABLED(CONFIG_ATM_LANE)
	br_fdb_test_addr_hook = NULL;
#endif

	br_fdb_fini();
}

module_init(br_init)
module_exit(br_deinit)
MODULE_LICENSE("GPL");
MODULE_VERSION(BR_VERSION);
MODULE_ALIAS_RTNL_LINK("bridge");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Generic parts
	3	* Linux ethernet bridge
	4	*
	5	* Authors:
	6	* Lennert Buytenhek <buytenh@gnu.org>
	7	*
1da177e4 LT	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version
	11	* 2 of the License, or (at your option) any later version.
	12	*/
	13
1da177e4 LT	14	#include <linux/module.h>
	15	#include <linux/kernel.h>
	16	#include <linux/netdevice.h>
	17	#include <linux/etherdevice.h>
	18	#include <linux/init.h>
cf0f02d0 SH	19	#include <linux/llc.h>
cf0f02d0 SH	20	#include <net/llc.h>
7c85fbf0	21	#include <net/stp.h>
1da177e4 LT	22
	23	#include "br_private.h"
	24
b1282726 CW	25	/*
	26	* Handle changes in state of network devices enslaved to a bridge.
	27	*
	28	* Note: don't care about up/down if bridge itself is down, because
	29	* port state is checked when bridge is brought up.
	30	*/
	31	static int br_device_event(struct notifier_block unused, unsigned long event, void ptr)
	32	{
	33	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	34	struct net_bridge_port *p;
	35	struct net_bridge *br;
	36	bool changed_addr;
	37	int err;
	38
	39	/* register of bridge completed, add sysfs entries */
	40	if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
	41	br_sysfs_addbr(dev);
	42	return NOTIFY_DONE;
	43	}
	44
	45	/* not a port of a bridge */
	46	p = br_port_get_rtnl(dev);
	47	if (!p)
	48	return NOTIFY_DONE;
	49
	50	br = p->br;
	51
	52	switch (event) {
	53	case NETDEV_CHANGEMTU:
	54	dev_set_mtu(br->dev, br_min_mtu(br));
	55	break;
	56
	57	case NETDEV_CHANGEADDR:
	58	spin_lock_bh(&br->lock);
	59	br_fdb_changeaddr(p, dev->dev_addr);
	60	changed_addr = br_stp_recalculate_bridge_id(br);
	61	spin_unlock_bh(&br->lock);
	62
	63	if (changed_addr)
	64	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
	65
	66	break;
	67
	68	case NETDEV_CHANGE:
	69	br_port_carrier_check(p);
	70	break;
	71
	72	case NETDEV_FEAT_CHANGE:
	73	netdev_update_features(br->dev);
	74	break;
	75
	76	case NETDEV_DOWN:
	77	spin_lock_bh(&br->lock);
	78	if (br->dev->flags & IFF_UP)
	79	br_stp_disable_port(p);
	80	spin_unlock_bh(&br->lock);
	81	break;
	82
	83	case NETDEV_UP:
	84	if (netif_running(br->dev) && netif_oper_up(dev)) {
	85	spin_lock_bh(&br->lock);
	86	br_stp_enable_port(p);
	87	spin_unlock_bh(&br->lock);
	88	}
89	break;
90
91	case NETDEV_UNREGISTER:
92	br_del_if(br, dev);
93	break;
94
95	case NETDEV_CHANGENAME:
96	err = br_sysfs_renameif(p);
97	if (err)
98	return notifier_from_errno(err);
99	break;
100
101	case NETDEV_PRE_TYPE_CHANGE:
102	/* Forbid underlaying device to change its type. */
103	return NOTIFY_BAD;
104
105	case NETDEV_RESEND_IGMP:
106	/* Propagate to master device */
107	call_netdevice_notifiers(event, br->dev);
108	break;
109	}
110
111	/* Events that may cause spanning tree to refresh */
112	if (event == NETDEV_CHANGEADDR \|\| event == NETDEV_UP \|\|
113	event == NETDEV_CHANGE \|\| event == NETDEV_DOWN)
114	br_ifinfo_notify(RTM_NEWLINK, p);
115
116	return NOTIFY_DONE;
117	}
118
119	static struct notifier_block br_device_notifier = {
120	.notifier_call = br_device_event
121	};
122
b86f81cc WC	123	static void __net_exit br_net_exit(struct net *net)
	124	{
	125	struct net_device *dev;
	126	LIST_HEAD(list);
	127
	128	rtnl_lock();
	129	for_each_netdev(net, dev)
	130	if (dev->priv_flags & IFF_EBRIDGE)
	131	br_dev_delete(dev, &list);
	132
	133	unregister_netdevice_many(&list);
	134	rtnl_unlock();
	135
	136	}
cf0f02d0	137
712d6954 AD	138	static struct pernet_operations br_net_ops = {
	139	.exit = br_net_exit,
	140	};
	141
b86f81cc WC	142	static const struct stp_proto br_stp_proto = {
	143	.rcv = br_stp_rcv,
	144	};
	145
1da177e4 LT	146	static int __init br_init(void)
1da177e4 LT	147	{
c0909713 SH	148	int err;
c0909713 SH	149
7c85fbf0 PM	150	err = stp_proto_register(&br_stp_proto);
7c85fbf0 PM	151	if (err < 0) {
28a16c97	152	pr_err("bridge: can't register sap for STP\n");
7c85fbf0	153	return err;
cf0f02d0 SH	154	}
cf0f02d0 SH	155
87a596e0 AM	156	err = br_fdb_init();
87a596e0 AM	157	if (err)
17efdd45	158	goto err_out;
1da177e4	159
712d6954	160	err = register_pernet_subsys(&br_net_ops);
c0909713 SH	161	if (err)
	162	goto err_out1;
	163
712d6954	164	err = br_netfilter_init();
c0909713 SH	165	if (err)
	166	goto err_out2;
	167
712d6954	168	err = register_netdevice_notifier(&br_device_notifier);
32fe21c0 TG	169	if (err)
	170	goto err_out3;
	171
712d6954 AD	172	err = br_netlink_init();
	173	if (err)
	174	goto err_out4;
	175
1da177e4	176	brioctl_set(br_ioctl_deviceless_stub);
1da177e4	177
e6373c4c	178	#if IS_ENABLED(CONFIG_ATM_LANE)
da678292 MM	179	br_fdb_test_addr_hook = br_fdb_test_addr;
da678292 MM	180	#endif
1da177e4	181
1da177e4	182	return 0;
712d6954	183	err_out4:
32fe21c0	184	unregister_netdevice_notifier(&br_device_notifier);
712d6954	185	err_out3:
c0909713	186	br_netfilter_fini();
712d6954 AD	187	err_out2:
712d6954 AD	188	unregister_pernet_subsys(&br_net_ops);
c0909713	189	err_out1:
17efdd45 PE	190	br_fdb_fini();
17efdd45 PE	191	err_out:
7c85fbf0	192	stp_proto_unregister(&br_stp_proto);
c0909713	193	return err;
1da177e4 LT	194	}
	195
	196	static void __exit br_deinit(void)
	197	{
7c85fbf0	198	stp_proto_unregister(&br_stp_proto);
cf0f02d0	199
11dc1f36	200	br_netlink_fini();
1da177e4 LT	201	unregister_netdevice_notifier(&br_device_notifier);
	202	brioctl_set(NULL);
	203
712d6954	204	unregister_pernet_subsys(&br_net_ops);
1da177e4	205
473c22d7	206	rcu_barrier(); /* Wait for completion of call_rcu()'s */
1da177e4	207
d69efb16	208	br_netfilter_fini();
e6373c4c	209	#if IS_ENABLED(CONFIG_ATM_LANE)
da678292 MM	210	br_fdb_test_addr_hook = NULL;
da678292 MM	211	#endif
1da177e4	212
1da177e4 LT	213	br_fdb_fini();
	214	}
	215
1da177e4 LT	216	module_init(br_init)
	217	module_exit(br_deinit)
	218	MODULE_LICENSE("GPL");
8cbb512e	219	MODULE_VERSION(BR_VERSION);
bb900b27	220	MODULE_ALIAS_RTNL_LINK("bridge");