[linux-block.git] / net / bridge / br.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	Generic parts
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 */

#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 netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
	struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	struct net_bridge_port *p;
	struct net_bridge *br;
	bool notified = false;
	bool changed_addr;
	int err;

	if (netif_is_bridge_master(dev)) {
		err = br_vlan_bridge_event(dev, event, ptr);
		if (err)
			return notifier_from_errno(err);

		if (event == NETDEV_REGISTER) {
			/* register of bridge completed, add sysfs entries */
			err = br_sysfs_addbr(dev);
			if (err)
				return notifier_from_errno(err);

			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:
		br_mtu_auto_adjust(br);
		break;

	case NETDEV_PRE_CHANGEADDR:
		if (br->dev->addr_assign_type == NET_ADDR_SET)
			break;
		prechaddr_info = ptr;
		err = dev_pre_changeaddr_notify(br->dev,
						prechaddr_info->dev_addr,
						extack);
		if (err)
			return notifier_from_errno(err);
		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, &notified);
		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);
			notified = true;
		}
		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);
			notified = true;
			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 underlying device to change its type. */
		return NOTIFY_BAD;

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

	if (event != NETDEV_UNREGISTER)
		br_vlan_port_event(p, event);

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

	return NOTIFY_DONE;
}

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

/* called with RTNL or RCU */
static int br_switchdev_event(struct notifier_block *unused,
			      unsigned long event, void *ptr)
{
	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
	struct net_bridge_port *p;
	struct net_bridge *br;
	struct switchdev_notifier_fdb_info *fdb_info;
	int err = NOTIFY_DONE;

	p = br_port_get_rtnl_rcu(dev);
	if (!p)
		goto out;

	br = p->br;

	switch (event) {
	case SWITCHDEV_FDB_ADD_TO_BRIDGE:
		fdb_info = ptr;
		err = br_fdb_external_learn_add(br, p, fdb_info->addr,
						fdb_info->vid,
						fdb_info->locked, false);
		if (err) {
			err = notifier_from_errno(err);
			break;
		}
		br_fdb_offloaded_set(br, p, fdb_info->addr,
				     fdb_info->vid, fdb_info->offloaded);
		break;
	case SWITCHDEV_FDB_DEL_TO_BRIDGE:
		fdb_info = ptr;
		err = br_fdb_external_learn_del(br, p, fdb_info->addr,
						fdb_info->vid, false);
		if (err)
			err = notifier_from_errno(err);
		break;
	case SWITCHDEV_FDB_OFFLOADED:
		fdb_info = ptr;
		br_fdb_offloaded_set(br, p, fdb_info->addr,
				     fdb_info->vid, fdb_info->offloaded);
		break;
	case SWITCHDEV_FDB_FLUSH_TO_BRIDGE:
		fdb_info = ptr;
		/* Don't delete static entries */
		br_fdb_delete_by_port(br, p, fdb_info->vid, 0);
		break;
	}

out:
	return err;
}

static struct notifier_block br_switchdev_notifier = {
	.notifier_call = br_switchdev_event,
};

/* called under rtnl_mutex */
static int br_switchdev_blocking_event(struct notifier_block *nb,
				       unsigned long event, void *ptr)
{
	struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
	struct switchdev_notifier_brport_info *brport_info;
	const struct switchdev_brport *b;
	struct net_bridge_port *p;
	int err = NOTIFY_DONE;

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

	switch (event) {
	case SWITCHDEV_BRPORT_OFFLOADED:
		brport_info = ptr;
		b = &brport_info->brport;

		err = br_switchdev_port_offload(p, b->dev, b->ctx,
						b->atomic_nb, b->blocking_nb,
						b->tx_fwd_offload, extack);
		err = notifier_from_errno(err);
		break;
	case SWITCHDEV_BRPORT_UNOFFLOADED:
		brport_info = ptr;
		b = &brport_info->brport;

		br_switchdev_port_unoffload(p, b->ctx, b->atomic_nb,
					    b->blocking_nb);
		break;
	case SWITCHDEV_BRPORT_REPLAY:
		brport_info = ptr;
		b = &brport_info->brport;

		err = br_switchdev_port_replay(p, b->dev, b->ctx, b->atomic_nb,
					       b->blocking_nb, extack);
		err = notifier_from_errno(err);
		break;
	}

out:
	return err;
}

static struct notifier_block br_switchdev_blocking_notifier = {
	.notifier_call = br_switchdev_blocking_event,
};

/* br_boolopt_toggle - change user-controlled boolean option
 *
 * @br: bridge device
 * @opt: id of the option to change
 * @on: new option value
 * @extack: extack for error messages
 *
 * Changes the value of the respective boolean option to @on taking care of
 * any internal option value mapping and configuration.
 */
int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
		      struct netlink_ext_ack *extack)
{
	int err = 0;

	switch (opt) {
	case BR_BOOLOPT_NO_LL_LEARN:
		br_opt_toggle(br, BROPT_NO_LL_LEARN, on);
		break;
	case BR_BOOLOPT_MCAST_VLAN_SNOOPING:
		err = br_multicast_toggle_vlan_snooping(br, on, extack);
		break;
	case BR_BOOLOPT_MST_ENABLE:
		err = br_mst_set_enabled(br, on, extack);
		break;
	default:
		/* shouldn't be called with unsupported options */
		WARN_ON(1);
		break;
	}

	return err;
}

int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt)
{
	switch (opt) {
	case BR_BOOLOPT_NO_LL_LEARN:
		return br_opt_get(br, BROPT_NO_LL_LEARN);
	case BR_BOOLOPT_MCAST_VLAN_SNOOPING:
		return br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED);
	case BR_BOOLOPT_MST_ENABLE:
		return br_opt_get(br, BROPT_MST_ENABLED);
	default:
		/* shouldn't be called with unsupported options */
		WARN_ON(1);
		break;
	}

	return 0;
}

int br_boolopt_multi_toggle(struct net_bridge *br,
			    struct br_boolopt_multi *bm,
			    struct netlink_ext_ack *extack)
{
	unsigned long bitmap = bm->optmask;
	int err = 0;
	int opt_id;

	for_each_set_bit(opt_id, &bitmap, BR_BOOLOPT_MAX) {
		bool on = !!(bm->optval & BIT(opt_id));

		err = br_boolopt_toggle(br, opt_id, on, extack);
		if (err) {
			br_debug(br, "boolopt multi-toggle error: option: %d current: %d new: %d error: %d\n",
				 opt_id, br_boolopt_get(br, opt_id), on, err);
			break;
		}
	}

	return err;
}

void br_boolopt_multi_get(const struct net_bridge *br,
			  struct br_boolopt_multi *bm)
{
	u32 optval = 0;
	int opt_id;

	for (opt_id = 0; opt_id < BR_BOOLOPT_MAX; opt_id++)
		optval |= (br_boolopt_get(br, opt_id) << opt_id);

	bm->optval = optval;
	bm->optmask = GENMASK((BR_BOOLOPT_MAX - 1), 0);
}

/* private bridge options, controlled by the kernel */
void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on)
{
	bool cur = !!br_opt_get(br, opt);

	br_debug(br, "toggle option: %d state: %d -> %d\n",
		 opt, cur, on);

	if (cur == on)
		return;

	if (on)
		set_bit(opt, &br->options);
	else
		clear_bit(opt, &br->options);
}

static void __net_exit br_net_exit_batch_rtnl(struct list_head *net_list,
					      struct list_head *dev_to_kill)
{
	struct net_device *dev;
	struct net *net;

	ASSERT_RTNL();
	list_for_each_entry(net, net_list, exit_list)
		for_each_netdev(net, dev)
			if (netif_is_bridge_master(dev))
				br_dev_delete(dev, dev_to_kill);
}

static struct pernet_operations br_net_ops = {
	.exit_batch_rtnl = br_net_exit_batch_rtnl,
};

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) > sizeof_field(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_switchdev_notifier(&br_switchdev_notifier);
	if (err)
		goto err_out4;

	err = register_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
	if (err)
		goto err_out5;

	err = br_netlink_init();
	if (err)
		goto err_out6;

	brioctl_set(br_ioctl_stub);

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

#if IS_MODULE(CONFIG_BRIDGE_NETFILTER)
	pr_info("bridge: filtering via arp/ip/ip6tables is no longer available "
		"by default. Update your scripts to load br_netfilter if you "
		"need this.\n");
#endif

	return 0;

err_out6:
	unregister_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
err_out5:
	unregister_switchdev_notifier(&br_switchdev_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_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
	unregister_switchdev_notifier(&br_switchdev_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");
MODULE_DESCRIPTION("Ethernet bridge driver");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* Generic parts
	4	* Linux ethernet bridge
	5	*
	6	* Authors:
	7	* Lennert Buytenhek <buytenh@gnu.org>
1da177e4 LT	8	*/
1da177e4 LT	9
1da177e4 LT	10	#include <linux/module.h>
	11	#include <linux/kernel.h>
	12	#include <linux/netdevice.h>
	13	#include <linux/etherdevice.h>
	14	#include <linux/init.h>
cf0f02d0 SH	15	#include <linux/llc.h>
cf0f02d0 SH	16	#include <net/llc.h>
7c85fbf0	17	#include <net/stp.h>
3aeb6617	18	#include <net/switchdev.h>
1da177e4 LT	19
	20	#include "br_private.h"
	21
b1282726 CW	22	/*
	23	* Handle changes in state of network devices enslaved to a bridge.
	24	*
	25	* Note: don't care about up/down if bridge itself is down, because
	26	* port state is checked when bridge is brought up.
	27	*/
	28	static int br_device_event(struct notifier_block unused, unsigned long event, void ptr)
	29	{
b89df65c PM	30	struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
b89df65c PM	31	struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
b1282726 CW	32	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	33	struct net_bridge_port *p;
	34	struct net_bridge *br;
faa1cd82	35	bool notified = false;
b1282726 CW	36	bool changed_addr;
	37	int err;
	38
254ec036	39	if (netif_is_bridge_master(dev)) {
091adf9b NA	40	err = br_vlan_bridge_event(dev, event, ptr);
	41	if (err)
	42	return notifier_from_errno(err);
	43
9c0ec2e7 MM	44	if (event == NETDEV_REGISTER) {
9c0ec2e7 MM	45	/* register of bridge completed, add sysfs entries */
989a1db0 WH	46	err = br_sysfs_addbr(dev);
	47	if (err)
	48	return notifier_from_errno(err);
	49
9c0ec2e7 MM	50	return NOTIFY_DONE;
9c0ec2e7 MM	51	}
b1282726 CW	52	}
	53
	54	/* not a port of a bridge */
	55	p = br_port_get_rtnl(dev);
	56	if (!p)
	57	return NOTIFY_DONE;
	58
	59	br = p->br;
	60
	61	switch (event) {
	62	case NETDEV_CHANGEMTU:
804b854d	63	br_mtu_auto_adjust(br);
b1282726 CW	64	break;
b1282726 CW	65
b89df65c PM	66	case NETDEV_PRE_CHANGEADDR:
	67	if (br->dev->addr_assign_type == NET_ADDR_SET)
	68	break;
	69	prechaddr_info = ptr;
	70	err = dev_pre_changeaddr_notify(br->dev,
	71	prechaddr_info->dev_addr,
	72	extack);
	73	if (err)
	74	return notifier_from_errno(err);
	75	break;
	76
b1282726 CW	77	case NETDEV_CHANGEADDR:
	78	spin_lock_bh(&br->lock);
	79	br_fdb_changeaddr(p, dev->dev_addr);
	80	changed_addr = br_stp_recalculate_bridge_id(br);
	81	spin_unlock_bh(&br->lock);
	82
	83	if (changed_addr)
	84	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
	85
	86	break;
	87
	88	case NETDEV_CHANGE:
faa1cd82	89	br_port_carrier_check(p, &notified);
b1282726 CW	90	break;
	91
	92	case NETDEV_FEAT_CHANGE:
	93	netdev_update_features(br->dev);
	94	break;
	95
	96	case NETDEV_DOWN:
	97	spin_lock_bh(&br->lock);
faa1cd82	98	if (br->dev->flags & IFF_UP) {
b1282726	99	br_stp_disable_port(p);
faa1cd82 NA	100	notified = true;
faa1cd82 NA	101	}
b1282726 CW	102	spin_unlock_bh(&br->lock);
	103	break;
	104
	105	case NETDEV_UP:
	106	if (netif_running(br->dev) && netif_oper_up(dev)) {
	107	spin_lock_bh(&br->lock);
	108	br_stp_enable_port(p);
faa1cd82	109	notified = true;
b1282726 CW	110	spin_unlock_bh(&br->lock);
	111	}
	112	break;
	113
	114	case NETDEV_UNREGISTER:
	115	br_del_if(br, dev);
	116	break;
	117
	118	case NETDEV_CHANGENAME:
	119	err = br_sysfs_renameif(p);
	120	if (err)
	121	return notifier_from_errno(err);
	122	break;
	123
	124	case NETDEV_PRE_TYPE_CHANGE:
efb5b338	125	/* Forbid underlying device to change its type. */
b1282726 CW	126	return NOTIFY_BAD;
	127
	128	case NETDEV_RESEND_IGMP:
	129	/* Propagate to master device */
	130	call_netdevice_notifiers(event, br->dev);
	131	break;
	132	}
	133
697cd36c IS	134	if (event != NETDEV_UNREGISTER)
697cd36c IS	135	br_vlan_port_event(p, event);
9c0ec2e7	136
b1282726	137	/* Events that may cause spanning tree to refresh */
faa1cd82 NA	138	if (!notified && (event == NETDEV_CHANGEADDR \|\| event == NETDEV_UP \|\|
faa1cd82 NA	139	event == NETDEV_CHANGE \|\| event == NETDEV_DOWN))
92899063	140	br_ifinfo_notify(RTM_NEWLINK, NULL, p);
b1282726 CW	141
	142	return NOTIFY_DONE;
	143	}
	144
	145	static struct notifier_block br_device_notifier = {
	146	.notifier_call = br_device_event
	147	};
	148
0baa10ff	149	/* called with RTNL or RCU */
ebb9a03a JP	150	static int br_switchdev_event(struct notifier_block *unused,
ebb9a03a JP	151	unsigned long event, void *ptr)
3aeb6617	152	{
ebb9a03a	153	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
3aeb6617 JP	154	struct net_bridge_port *p;
3aeb6617 JP	155	struct net_bridge *br;
ebb9a03a	156	struct switchdev_notifier_fdb_info *fdb_info;
3aeb6617 JP	157	int err = NOTIFY_DONE;
3aeb6617 JP	158
0baa10ff	159	p = br_port_get_rtnl_rcu(dev);
3aeb6617 JP	160	if (!p)
	161	goto out;
	162
	163	br = p->br;
	164
	165	switch (event) {
6b26b51b	166	case SWITCHDEV_FDB_ADD_TO_BRIDGE:
3aeb6617 JP	167	fdb_info = ptr;
3aeb6617 JP	168	err = br_fdb_external_learn_add(br, p, fdb_info->addr,
27fabd02 HS	169	fdb_info->vid,
27fabd02 HS	170	fdb_info->locked, false);
9fe8bcec	171	if (err) {
3aeb6617	172	err = notifier_from_errno(err);
9fe8bcec AS	173	break;
	174	}
	175	br_fdb_offloaded_set(br, p, fdb_info->addr,
9baedc3c	176	fdb_info->vid, fdb_info->offloaded);
3aeb6617	177	break;
6b26b51b	178	case SWITCHDEV_FDB_DEL_TO_BRIDGE:
3aeb6617 JP	179	fdb_info = ptr;
3aeb6617 JP	180	err = br_fdb_external_learn_del(br, p, fdb_info->addr,
161d82de	181	fdb_info->vid, false);
3aeb6617 JP	182	if (err)
	183	err = notifier_from_errno(err);
	184	break;
9fe8bcec AS	185	case SWITCHDEV_FDB_OFFLOADED:
	186	fdb_info = ptr;
	187	br_fdb_offloaded_set(br, p, fdb_info->addr,
e9ba0fbc	188	fdb_info->vid, fdb_info->offloaded);
9fe8bcec	189	break;
d05e8e68 AW	190	case SWITCHDEV_FDB_FLUSH_TO_BRIDGE:
	191	fdb_info = ptr;
	192	/* Don't delete static entries */
	193	br_fdb_delete_by_port(br, p, fdb_info->vid, 0);
	194	break;
3aeb6617 JP	195	}
	196
	197	out:
3aeb6617 JP	198	return err;
	199	}
	200
ebb9a03a JP	201	static struct notifier_block br_switchdev_notifier = {
ebb9a03a JP	202	.notifier_call = br_switchdev_event,
3aeb6617 JP	203	};
3aeb6617 JP	204
957e2235 VO	205	/* called under rtnl_mutex */
	206	static int br_switchdev_blocking_event(struct notifier_block *nb,
	207	unsigned long event, void *ptr)
	208	{
	209	struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
	210	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
	211	struct switchdev_notifier_brport_info *brport_info;
	212	const struct switchdev_brport *b;
	213	struct net_bridge_port *p;
	214	int err = NOTIFY_DONE;
	215
	216	p = br_port_get_rtnl(dev);
	217	if (!p)
	218	goto out;
	219
	220	switch (event) {
	221	case SWITCHDEV_BRPORT_OFFLOADED:
	222	brport_info = ptr;
	223	b = &brport_info->brport;
	224
	225	err = br_switchdev_port_offload(p, b->dev, b->ctx,
	226	b->atomic_nb, b->blocking_nb,
	227	b->tx_fwd_offload, extack);
	228	err = notifier_from_errno(err);
	229	break;
	230	case SWITCHDEV_BRPORT_UNOFFLOADED:
	231	brport_info = ptr;
	232	b = &brport_info->brport;
	233
	234	br_switchdev_port_unoffload(p, b->ctx, b->atomic_nb,
	235	b->blocking_nb);
	236	break;
f2e2857b PM	237	case SWITCHDEV_BRPORT_REPLAY:
	238	brport_info = ptr;
	239	b = &brport_info->brport;
	240
	241	err = br_switchdev_port_replay(p, b->dev, b->ctx, b->atomic_nb,
	242	b->blocking_nb, extack);
	243	err = notifier_from_errno(err);
	244	break;
957e2235 VO	245	}
	246
	247	out:
	248	return err;
	249	}
	250
	251	static struct notifier_block br_switchdev_blocking_notifier = {
	252	.notifier_call = br_switchdev_blocking_event,
	253	};
	254
a428afe8 NA	255	/* br_boolopt_toggle - change user-controlled boolean option
	256	*
	257	* @br: bridge device
	258	* @opt: id of the option to change
	259	* @on: new option value
	260	* @extack: extack for error messages
	261	*
	262	* Changes the value of the respective boolean option to @on taking care of
	263	* any internal option value mapping and configuration.
	264	*/
	265	int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
	266	struct netlink_ext_ack *extack)
	267	{
f4b7002a NA	268	int err = 0;
f4b7002a NA	269
a428afe8	270	switch (opt) {
70e4272b NA	271	case BR_BOOLOPT_NO_LL_LEARN:
	272	br_opt_toggle(br, BROPT_NO_LL_LEARN, on);
	273	break;
f4b7002a NA	274	case BR_BOOLOPT_MCAST_VLAN_SNOOPING:
	275	err = br_multicast_toggle_vlan_snooping(br, on, extack);
	276	break;
ec7328b5 TW	277	case BR_BOOLOPT_MST_ENABLE:
	278	err = br_mst_set_enabled(br, on, extack);
	279	break;
a428afe8 NA	280	default:
	281	/* shouldn't be called with unsupported options */
	282	WARN_ON(1);
	283	break;
	284	}
	285
f4b7002a	286	return err;
a428afe8 NA	287	}
	288
	289	int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt)
	290	{
	291	switch (opt) {
70e4272b NA	292	case BR_BOOLOPT_NO_LL_LEARN:
70e4272b NA	293	return br_opt_get(br, BROPT_NO_LL_LEARN);
f4b7002a NA	294	case BR_BOOLOPT_MCAST_VLAN_SNOOPING:
f4b7002a NA	295	return br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED);
ec7328b5 TW	296	case BR_BOOLOPT_MST_ENABLE:
ec7328b5 TW	297	return br_opt_get(br, BROPT_MST_ENABLED);
a428afe8 NA	298	default:
	299	/* shouldn't be called with unsupported options */
	300	WARN_ON(1);
	301	break;
	302	}
	303
	304	return 0;
	305	}
	306
	307	int br_boolopt_multi_toggle(struct net_bridge *br,
	308	struct br_boolopt_multi *bm,
	309	struct netlink_ext_ack *extack)
	310	{
	311	unsigned long bitmap = bm->optmask;
	312	int err = 0;
	313	int opt_id;
	314
	315	for_each_set_bit(opt_id, &bitmap, BR_BOOLOPT_MAX) {
	316	bool on = !!(bm->optval & BIT(opt_id));
	317
	318	err = br_boolopt_toggle(br, opt_id, on, extack);
	319	if (err) {
	320	br_debug(br, "boolopt multi-toggle error: option: %d current: %d new: %d error: %d\n",
	321	opt_id, br_boolopt_get(br, opt_id), on, err);
	322	break;
	323	}
	324	}
	325
	326	return err;
	327	}
	328
	329	void br_boolopt_multi_get(const struct net_bridge *br,
	330	struct br_boolopt_multi *bm)
	331	{
	332	u32 optval = 0;
	333	int opt_id;
	334
	335	for (opt_id = 0; opt_id < BR_BOOLOPT_MAX; opt_id++)
	336	optval \|= (br_boolopt_get(br, opt_id) << opt_id);
	337
	338	bm->optval = optval;
1ed1ccb9	339	bm->optmask = GENMASK((BR_BOOLOPT_MAX - 1), 0);
a428afe8 NA	340	}
	341
	342	/* private bridge options, controlled by the kernel */
ae75767e NA	343	void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on)
	344	{
	345	bool cur = !!br_opt_get(br, opt);
	346
	347	br_debug(br, "toggle option: %d state: %d -> %d\n",
	348	opt, cur, on);
	349
	350	if (cur == on)
	351	return;
	352
	353	if (on)
	354	set_bit(opt, &br->options);
	355	else
	356	clear_bit(opt, &br->options);
	357	}
	358
806b6785 ED	359	static void __net_exit br_net_exit_batch_rtnl(struct list_head *net_list,
806b6785 ED	360	struct list_head *dev_to_kill)
b86f81cc WC	361	{
b86f81cc WC	362	struct net_device *dev;
36a29fb6	363	struct net *net;
36a29fb6	364
806b6785	365	ASSERT_RTNL();
36a29fb6 ED	366	list_for_each_entry(net, net_list, exit_list)
	367	for_each_netdev(net, dev)
	368	if (netif_is_bridge_master(dev))
806b6785	369	br_dev_delete(dev, dev_to_kill);
b86f81cc	370	}
cf0f02d0	371
712d6954	372	static struct pernet_operations br_net_ops = {
806b6785	373	.exit_batch_rtnl = br_net_exit_batch_rtnl,
712d6954 AD	374	};
712d6954 AD	375
b86f81cc WC	376	static const struct stp_proto br_stp_proto = {
	377	.rcv = br_stp_rcv,
	378	};
	379
1da177e4 LT	380	static int __init br_init(void)
1da177e4 LT	381	{
c0909713 SH	382	int err;
c0909713 SH	383
c593642c	384	BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > sizeof_field(struct sk_buff, cb));
71e168b1	385
7c85fbf0 PM	386	err = stp_proto_register(&br_stp_proto);
7c85fbf0 PM	387	if (err < 0) {
28a16c97	388	pr_err("bridge: can't register sap for STP\n");
7c85fbf0	389	return err;
cf0f02d0 SH	390	}
cf0f02d0 SH	391
87a596e0 AM	392	err = br_fdb_init();
87a596e0 AM	393	if (err)
17efdd45	394	goto err_out;
1da177e4	395
712d6954	396	err = register_pernet_subsys(&br_net_ops);
c0909713 SH	397	if (err)
	398	goto err_out1;
	399
34666d46	400	err = br_nf_core_init();
c0909713 SH	401	if (err)
	402	goto err_out2;
	403
712d6954	404	err = register_netdevice_notifier(&br_device_notifier);
32fe21c0 TG	405	if (err)
	406	goto err_out3;
	407
ebb9a03a	408	err = register_switchdev_notifier(&br_switchdev_notifier);
712d6954 AD	409	if (err)
	410	goto err_out4;
	411
957e2235	412	err = register_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
3aeb6617 JP	413	if (err)
	414	goto err_out5;
	415
957e2235 VO	416	err = br_netlink_init();
	417	if (err)
	418	goto err_out6;
	419
ad2f99ae	420	brioctl_set(br_ioctl_stub);
1da177e4	421
e6373c4c	422	#if IS_ENABLED(CONFIG_ATM_LANE)
da678292 MM	423	br_fdb_test_addr_hook = br_fdb_test_addr;
da678292 MM	424	#endif
1da177e4	425
d4ef9f72 SA	426	#if IS_MODULE(CONFIG_BRIDGE_NETFILTER)
	427	pr_info("bridge: filtering via arp/ip/ip6tables is no longer available "
	428	"by default. Update your scripts to load br_netfilter if you "
34666d46	429	"need this.\n");
d4ef9f72	430	#endif
34666d46	431
1da177e4	432	return 0;
34666d46	433
957e2235 VO	434	err_out6:
957e2235 VO	435	unregister_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
3aeb6617	436	err_out5:
ebb9a03a	437	unregister_switchdev_notifier(&br_switchdev_notifier);
712d6954	438	err_out4:
32fe21c0	439	unregister_netdevice_notifier(&br_device_notifier);
712d6954	440	err_out3:
34666d46	441	br_nf_core_fini();
712d6954 AD	442	err_out2:
712d6954 AD	443	unregister_pernet_subsys(&br_net_ops);
c0909713	444	err_out1:
17efdd45 PE	445	br_fdb_fini();
17efdd45 PE	446	err_out:
7c85fbf0	447	stp_proto_unregister(&br_stp_proto);
c0909713	448	return err;
1da177e4 LT	449	}
	450
	451	static void __exit br_deinit(void)
	452	{
7c85fbf0	453	stp_proto_unregister(&br_stp_proto);
11dc1f36	454	br_netlink_fini();
957e2235	455	unregister_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
ebb9a03a	456	unregister_switchdev_notifier(&br_switchdev_notifier);
1da177e4 LT	457	unregister_netdevice_notifier(&br_device_notifier);
1da177e4 LT	458	brioctl_set(NULL);
712d6954	459	unregister_pernet_subsys(&br_net_ops);
1da177e4	460
473c22d7	461	rcu_barrier(); /* Wait for completion of call_rcu()'s */
1da177e4	462
34666d46	463	br_nf_core_fini();
e6373c4c	464	#if IS_ENABLED(CONFIG_ATM_LANE)
da678292 MM	465	br_fdb_test_addr_hook = NULL;
da678292 MM	466	#endif
1da177e4 LT	467	br_fdb_fini();
	468	}
	469
1da177e4 LT	470	module_init(br_init)
	471	module_exit(br_deinit)
	472	MODULE_LICENSE("GPL");
8cbb512e	473	MODULE_VERSION(BR_VERSION);
bb900b27	474	MODULE_ALIAS_RTNL_LINK("bridge");
68089183	475	MODULE_DESCRIPTION("Ethernet bridge driver");