[mirror_ubuntu-artful-kernel.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 <net/switchdev.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 int br_netdev_switch_event(struct notifier_block *unused,
				  unsigned long event, void *ptr)
{
	struct net_device *dev = netdev_switch_notifier_info_to_dev(ptr);
	struct net_bridge_port *p;
	struct net_bridge *br;
	struct netdev_switch_notifier_fdb_info *fdb_info;
	int err = NOTIFY_DONE;

	rtnl_lock();
	p = br_port_get_rtnl(dev);
	if (!p)
		goto out;

	br = p->br;

	switch (event) {
	case NETDEV_SWITCH_FDB_ADD:
		fdb_info = ptr;
		err = br_fdb_external_learn_add(br, p, fdb_info->addr,
						fdb_info->vid);
		if (err)
			err = notifier_from_errno(err);
		break;
	case NETDEV_SWITCH_FDB_DEL:
		fdb_info = ptr;
		err = br_fdb_external_learn_del(br, p, fdb_info->addr,
						fdb_info->vid);
		if (err)
			err = notifier_from_errno(err);
		break;
	}

out:
	rtnl_unlock();
	return err;
}

static struct notifier_block br_netdev_switch_notifier = {
	.notifier_call = br_netdev_switch_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;

	BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));

	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_nf_core_init();
	if (err)
		goto err_out2;

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

	err = register_netdev_switch_notifier(&br_netdev_switch_notifier);
	if (err)
		goto err_out4;

	err = br_netlink_init();
	if (err)
		goto err_out5;

	brioctl_set(br_ioctl_deviceless_stub);

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

	pr_info("bridge: automatic filtering via arp/ip/ip6tables has been "
		"deprecated. Update your scripts to load br_netfilter if you "
		"need this.\n");

	return 0;

err_out5:
	unregister_netdev_switch_notifier(&br_netdev_switch_notifier);
err_out4:
	unregister_netdevice_notifier(&br_device_notifier);
err_out3:
	br_nf_core_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_netdev_switch_notifier(&br_netdev_switch_notifier);
	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_nf_core_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>
3aeb6617	22	#include <net/switchdev.h>
1da177e4 LT	23
	24	#include "br_private.h"
	25
b1282726 CW	26	/*
	27	* Handle changes in state of network devices enslaved to a bridge.
	28	*
	29	* Note: don't care about up/down if bridge itself is down, because
	30	* port state is checked when bridge is brought up.
	31	*/
	32	static int br_device_event(struct notifier_block unused, unsigned long event, void ptr)
	33	{
	34	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	35	struct net_bridge_port *p;
	36	struct net_bridge *br;
	37	bool changed_addr;
	38	int err;
	39
	40	/* register of bridge completed, add sysfs entries */
	41	if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
	42	br_sysfs_addbr(dev);
	43	return NOTIFY_DONE;
	44	}
	45
	46	/* not a port of a bridge */
	47	p = br_port_get_rtnl(dev);
	48	if (!p)
	49	return NOTIFY_DONE;
	50
	51	br = p->br;
	52
	53	switch (event) {
	54	case NETDEV_CHANGEMTU:
	55	dev_set_mtu(br->dev, br_min_mtu(br));
	56	break;
	57
	58	case NETDEV_CHANGEADDR:
	59	spin_lock_bh(&br->lock);
	60	br_fdb_changeaddr(p, dev->dev_addr);
	61	changed_addr = br_stp_recalculate_bridge_id(br);
	62	spin_unlock_bh(&br->lock);
	63
	64	if (changed_addr)
	65	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
	66
	67	break;
	68
	69	case NETDEV_CHANGE:
	70	br_port_carrier_check(p);
	71	break;
	72
	73	case NETDEV_FEAT_CHANGE:
	74	netdev_update_features(br->dev);
	75	break;
	76
	77	case NETDEV_DOWN:
	78	spin_lock_bh(&br->lock);
	79	if (br->dev->flags & IFF_UP)
	80	br_stp_disable_port(p);
	81	spin_unlock_bh(&br->lock);
	82	break;
	83
	84	case NETDEV_UP:
	85	if (netif_running(br->dev) && netif_oper_up(dev)) {
	86	spin_lock_bh(&br->lock);
	87	br_stp_enable_port(p);
	88	spin_unlock_bh(&br->lock);
	89	}
90	break;
91
92	case NETDEV_UNREGISTER:
93	br_del_if(br, dev);
94	break;
95
96	case NETDEV_CHANGENAME:
97	err = br_sysfs_renameif(p);
98	if (err)
99	return notifier_from_errno(err);
100	break;
101
102	case NETDEV_PRE_TYPE_CHANGE:
103	/* Forbid underlaying device to change its type. */
104	return NOTIFY_BAD;
105
106	case NETDEV_RESEND_IGMP:
107	/* Propagate to master device */
108	call_netdevice_notifiers(event, br->dev);
109	break;
110	}
111
112	/* Events that may cause spanning tree to refresh */
113	if (event == NETDEV_CHANGEADDR \|\| event == NETDEV_UP \|\|
114	event == NETDEV_CHANGE \|\| event == NETDEV_DOWN)
115	br_ifinfo_notify(RTM_NEWLINK, p);
116
117	return NOTIFY_DONE;
118	}
119
120	static struct notifier_block br_device_notifier = {
121	.notifier_call = br_device_event
122	};
123
3aeb6617 JP	124	static int br_netdev_switch_event(struct notifier_block *unused,
	125	unsigned long event, void *ptr)
	126	{
	127	struct net_device *dev = netdev_switch_notifier_info_to_dev(ptr);
	128	struct net_bridge_port *p;
	129	struct net_bridge *br;
	130	struct netdev_switch_notifier_fdb_info *fdb_info;
	131	int err = NOTIFY_DONE;
	132
	133	rtnl_lock();
	134	p = br_port_get_rtnl(dev);
	135	if (!p)
	136	goto out;
	137
	138	br = p->br;
	139
	140	switch (event) {
	141	case NETDEV_SWITCH_FDB_ADD:
	142	fdb_info = ptr;
	143	err = br_fdb_external_learn_add(br, p, fdb_info->addr,
	144	fdb_info->vid);
	145	if (err)
	146	err = notifier_from_errno(err);
	147	break;
	148	case NETDEV_SWITCH_FDB_DEL:
	149	fdb_info = ptr;
	150	err = br_fdb_external_learn_del(br, p, fdb_info->addr,
	151	fdb_info->vid);
	152	if (err)
	153	err = notifier_from_errno(err);
	154	break;
	155	}
	156
	157	out:
	158	rtnl_unlock();
	159	return err;
	160	}
	161
	162	static struct notifier_block br_netdev_switch_notifier = {
	163	.notifier_call = br_netdev_switch_event,
	164	};
	165
b86f81cc WC	166	static void __net_exit br_net_exit(struct net *net)
	167	{
	168	struct net_device *dev;
	169	LIST_HEAD(list);
	170
	171	rtnl_lock();
	172	for_each_netdev(net, dev)
	173	if (dev->priv_flags & IFF_EBRIDGE)
	174	br_dev_delete(dev, &list);
	175
	176	unregister_netdevice_many(&list);
	177	rtnl_unlock();
	178
	179	}
cf0f02d0	180
712d6954 AD	181	static struct pernet_operations br_net_ops = {
	182	.exit = br_net_exit,
	183	};
	184
b86f81cc WC	185	static const struct stp_proto br_stp_proto = {
	186	.rcv = br_stp_rcv,
	187	};
	188
1da177e4 LT	189	static int __init br_init(void)
1da177e4 LT	190	{
c0909713 SH	191	int err;
c0909713 SH	192
71e168b1 FW	193	BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
71e168b1 FW	194
7c85fbf0 PM	195	err = stp_proto_register(&br_stp_proto);
7c85fbf0 PM	196	if (err < 0) {
28a16c97	197	pr_err("bridge: can't register sap for STP\n");
7c85fbf0	198	return err;
cf0f02d0 SH	199	}
cf0f02d0 SH	200
87a596e0 AM	201	err = br_fdb_init();
87a596e0 AM	202	if (err)
17efdd45	203	goto err_out;
1da177e4	204
712d6954	205	err = register_pernet_subsys(&br_net_ops);
c0909713 SH	206	if (err)
	207	goto err_out1;
	208
34666d46	209	err = br_nf_core_init();
c0909713 SH	210	if (err)
	211	goto err_out2;
	212
712d6954	213	err = register_netdevice_notifier(&br_device_notifier);
32fe21c0 TG	214	if (err)
	215	goto err_out3;
	216
3aeb6617	217	err = register_netdev_switch_notifier(&br_netdev_switch_notifier);
712d6954 AD	218	if (err)
	219	goto err_out4;
	220
3aeb6617 JP	221	err = br_netlink_init();
	222	if (err)
	223	goto err_out5;
	224
1da177e4	225	brioctl_set(br_ioctl_deviceless_stub);
1da177e4	226
e6373c4c	227	#if IS_ENABLED(CONFIG_ATM_LANE)
da678292 MM	228	br_fdb_test_addr_hook = br_fdb_test_addr;
da678292 MM	229	#endif
1da177e4	230
34666d46 PNA	231	pr_info("bridge: automatic filtering via arp/ip/ip6tables has been "
	232	"deprecated. Update your scripts to load br_netfilter if you "
	233	"need this.\n");
	234
1da177e4	235	return 0;
34666d46	236
3aeb6617 JP	237	err_out5:
3aeb6617 JP	238	unregister_netdev_switch_notifier(&br_netdev_switch_notifier);
712d6954	239	err_out4:
32fe21c0	240	unregister_netdevice_notifier(&br_device_notifier);
712d6954	241	err_out3:
34666d46	242	br_nf_core_fini();
712d6954 AD	243	err_out2:
712d6954 AD	244	unregister_pernet_subsys(&br_net_ops);
c0909713	245	err_out1:
17efdd45 PE	246	br_fdb_fini();
17efdd45 PE	247	err_out:
7c85fbf0	248	stp_proto_unregister(&br_stp_proto);
c0909713	249	return err;
1da177e4 LT	250	}
	251
	252	static void __exit br_deinit(void)
	253	{
7c85fbf0	254	stp_proto_unregister(&br_stp_proto);
11dc1f36	255	br_netlink_fini();
3aeb6617	256	unregister_netdev_switch_notifier(&br_netdev_switch_notifier);
1da177e4 LT	257	unregister_netdevice_notifier(&br_device_notifier);
1da177e4 LT	258	brioctl_set(NULL);
712d6954	259	unregister_pernet_subsys(&br_net_ops);
1da177e4	260
473c22d7	261	rcu_barrier(); /* Wait for completion of call_rcu()'s */
1da177e4	262
34666d46	263	br_nf_core_fini();
e6373c4c	264	#if IS_ENABLED(CONFIG_ATM_LANE)
da678292 MM	265	br_fdb_test_addr_hook = NULL;
da678292 MM	266	#endif
1da177e4 LT	267	br_fdb_fini();
	268	}
	269
1da177e4 LT	270	module_init(br_init)
	271	module_exit(br_deinit)
	272	MODULE_LICENSE("GPL");
8cbb512e	273	MODULE_VERSION(BR_VERSION);
bb900b27	274	MODULE_ALIAS_RTNL_LINK("bridge");