[mirror_ubuntu-jammy-kernel.git] / net / bridge / br_device.c

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

#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/netpoll.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/list.h>
#include <linux/netfilter_bridge.h>

#include <linux/uaccess.h>
#include "br_private.h"

#define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
			 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)

const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
EXPORT_SYMBOL_GPL(nf_br_ops);

/* net device transmit always called with BH disabled */
netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_fdb_entry *dst;
	struct net_bridge_mdb_entry *mdst;
	struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
	const struct nf_br_ops *nf_ops;
	u8 state = BR_STATE_FORWARDING;
	const unsigned char *dest;
	u16 vid = 0;

	rcu_read_lock();
	nf_ops = rcu_dereference(nf_br_ops);
	if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
		rcu_read_unlock();
		return NETDEV_TX_OK;
	}

	u64_stats_update_begin(&brstats->syncp);
	brstats->tx_packets++;
	brstats->tx_bytes += skb->len;
	u64_stats_update_end(&brstats->syncp);

	br_switchdev_frame_unmark(skb);
	BR_INPUT_SKB_CB(skb)->brdev = dev;
	BR_INPUT_SKB_CB(skb)->frag_max_size = 0;

	skb_reset_mac_header(skb);
	skb_pull(skb, ETH_HLEN);

	if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid, &state))
		goto out;

	if (IS_ENABLED(CONFIG_INET) &&
	    (eth_hdr(skb)->h_proto == htons(ETH_P_ARP) ||
	     eth_hdr(skb)->h_proto == htons(ETH_P_RARP)) &&
	    br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
		br_do_proxy_suppress_arp(skb, br, vid, NULL);
	} else if (IS_ENABLED(CONFIG_IPV6) &&
		   skb->protocol == htons(ETH_P_IPV6) &&
		   br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
		   pskb_may_pull(skb, sizeof(struct ipv6hdr) +
				 sizeof(struct nd_msg)) &&
		   ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
			struct nd_msg *msg, _msg;

			msg = br_is_nd_neigh_msg(skb, &_msg);
			if (msg)
				br_do_suppress_nd(skb, br, vid, NULL, msg);
	}

	dest = eth_hdr(skb)->h_dest;
	if (is_broadcast_ether_addr(dest)) {
		br_flood(br, skb, BR_PKT_BROADCAST, false, true);
	} else if (is_multicast_ether_addr(dest)) {
		if (unlikely(netpoll_tx_running(dev))) {
			br_flood(br, skb, BR_PKT_MULTICAST, false, true);
			goto out;
		}
		if (br_multicast_rcv(br, NULL, skb, vid)) {
			kfree_skb(skb);
			goto out;
		}

		mdst = br_mdb_get(br, skb, vid);
		if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
		    br_multicast_querier_exists(br, eth_hdr(skb)))
			br_multicast_flood(mdst, skb, false, true);
		else
			br_flood(br, skb, BR_PKT_MULTICAST, false, true);
	} else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
		br_forward(dst->dst, skb, false, true);
	} else {
		br_flood(br, skb, BR_PKT_UNICAST, false, true);
	}
out:
	rcu_read_unlock();
	return NETDEV_TX_OK;
}

static int br_dev_init(struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);
	int err;

	br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
	if (!br->stats)
		return -ENOMEM;

	err = br_fdb_hash_init(br);
	if (err) {
		free_percpu(br->stats);
		return err;
	}

	err = br_mdb_hash_init(br);
	if (err) {
		free_percpu(br->stats);
		br_fdb_hash_fini(br);
		return err;
	}

	err = br_vlan_init(br);
	if (err) {
		free_percpu(br->stats);
		br_mdb_hash_fini(br);
		br_fdb_hash_fini(br);
		return err;
	}

	err = br_multicast_init_stats(br);
	if (err) {
		free_percpu(br->stats);
		br_vlan_flush(br);
		br_mdb_hash_fini(br);
		br_fdb_hash_fini(br);
	}

	return err;
}

static void br_dev_uninit(struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);

	br_multicast_dev_del(br);
	br_multicast_uninit_stats(br);
	br_vlan_flush(br);
	br_mdb_hash_fini(br);
	br_fdb_hash_fini(br);
	free_percpu(br->stats);
}

static int br_dev_open(struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);

	netdev_update_features(dev);
	netif_start_queue(dev);
	br_stp_enable_bridge(br);
	br_multicast_open(br);

	return 0;
}

static void br_dev_set_multicast_list(struct net_device *dev)
{
}

static void br_dev_change_rx_flags(struct net_device *dev, int change)
{
	if (change & IFF_PROMISC)
		br_manage_promisc(netdev_priv(dev));
}

static int br_dev_stop(struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);

	br_stp_disable_bridge(br);
	br_multicast_stop(br);

	netif_stop_queue(dev);

	return 0;
}

static void br_get_stats64(struct net_device *dev,
			   struct rtnl_link_stats64 *stats)
{
	struct net_bridge *br = netdev_priv(dev);
	struct pcpu_sw_netstats tmp, sum = { 0 };
	unsigned int cpu;

	for_each_possible_cpu(cpu) {
		unsigned int start;
		const struct pcpu_sw_netstats *bstats
			= per_cpu_ptr(br->stats, cpu);
		do {
			start = u64_stats_fetch_begin_irq(&bstats->syncp);
			memcpy(&tmp, bstats, sizeof(tmp));
		} while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
		sum.tx_bytes   += tmp.tx_bytes;
		sum.tx_packets += tmp.tx_packets;
		sum.rx_bytes   += tmp.rx_bytes;
		sum.rx_packets += tmp.rx_packets;
	}

	stats->tx_bytes   = sum.tx_bytes;
	stats->tx_packets = sum.tx_packets;
	stats->rx_bytes   = sum.rx_bytes;
	stats->rx_packets = sum.rx_packets;
}

static int br_change_mtu(struct net_device *dev, int new_mtu)
{
	struct net_bridge *br = netdev_priv(dev);

	dev->mtu = new_mtu;

	/* this flag will be cleared if the MTU was automatically adjusted */
	br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
	/* remember the MTU in the rtable for PMTU */
	dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
#endif

	return 0;
}

/* Allow setting mac address to any valid ethernet address. */
static int br_set_mac_address(struct net_device *dev, void *p)
{
	struct net_bridge *br = netdev_priv(dev);
	struct sockaddr *addr = p;

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	/* dev_set_mac_addr() can be called by a master device on bridge's
	 * NETDEV_UNREGISTER, but since it's being destroyed do nothing
	 */
	if (dev->reg_state != NETREG_REGISTERED)
		return -EBUSY;

	spin_lock_bh(&br->lock);
	if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
		/* Mac address will be changed in br_stp_change_bridge_id(). */
		br_stp_change_bridge_id(br, addr->sa_data);
	}
	spin_unlock_bh(&br->lock);

	return 0;
}

static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
	strlcpy(info->driver, "bridge", sizeof(info->driver));
	strlcpy(info->version, BR_VERSION, sizeof(info->version));
	strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
	strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
}

static int br_get_link_ksettings(struct net_device *dev,
				 struct ethtool_link_ksettings *cmd)
{
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_port *p;

	cmd->base.duplex = DUPLEX_UNKNOWN;
	cmd->base.port = PORT_OTHER;
	cmd->base.speed = SPEED_UNKNOWN;

	list_for_each_entry(p, &br->port_list, list) {
		struct ethtool_link_ksettings ecmd;
		struct net_device *pdev = p->dev;

		if (!netif_running(pdev) || !netif_oper_up(pdev))
			continue;

		if (__ethtool_get_link_ksettings(pdev, &ecmd))
			continue;

		if (ecmd.base.speed == (__u32)SPEED_UNKNOWN)
			continue;

		if (cmd->base.speed == (__u32)SPEED_UNKNOWN ||
		    cmd->base.speed < ecmd.base.speed)
			cmd->base.speed = ecmd.base.speed;
	}

	return 0;
}

static netdev_features_t br_fix_features(struct net_device *dev,
	netdev_features_t features)
{
	struct net_bridge *br = netdev_priv(dev);

	return br_features_recompute(br, features);
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void br_poll_controller(struct net_device *br_dev)
{
}

static void br_netpoll_cleanup(struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_port *p;

	list_for_each_entry(p, &br->port_list, list)
		br_netpoll_disable(p);
}

static int __br_netpoll_enable(struct net_bridge_port *p)
{
	struct netpoll *np;
	int err;

	np = kzalloc(sizeof(*p->np), GFP_KERNEL);
	if (!np)
		return -ENOMEM;

	err = __netpoll_setup(np, p->dev);
	if (err) {
		kfree(np);
		return err;
	}

	p->np = np;
	return err;
}

int br_netpoll_enable(struct net_bridge_port *p)
{
	if (!p->br->dev->npinfo)
		return 0;

	return __br_netpoll_enable(p);
}

static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
{
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_port *p;
	int err = 0;

	list_for_each_entry(p, &br->port_list, list) {
		if (!p->dev)
			continue;
		err = __br_netpoll_enable(p);
		if (err)
			goto fail;
	}

out:
	return err;

fail:
	br_netpoll_cleanup(dev);
	goto out;
}

void br_netpoll_disable(struct net_bridge_port *p)
{
	struct netpoll *np = p->np;

	if (!np)
		return;

	p->np = NULL;

	__netpoll_free(np);
}

#endif

static int br_add_slave(struct net_device *dev, struct net_device *slave_dev,
			struct netlink_ext_ack *extack)

{
	struct net_bridge *br = netdev_priv(dev);

	return br_add_if(br, slave_dev, extack);
}

static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
{
	struct net_bridge *br = netdev_priv(dev);

	return br_del_if(br, slave_dev);
}

static const struct ethtool_ops br_ethtool_ops = {
	.get_drvinfo		 = br_getinfo,
	.get_link		 = ethtool_op_get_link,
	.get_link_ksettings	 = br_get_link_ksettings,
};

static const struct net_device_ops br_netdev_ops = {
	.ndo_open		 = br_dev_open,
	.ndo_stop		 = br_dev_stop,
	.ndo_init		 = br_dev_init,
	.ndo_uninit		 = br_dev_uninit,
	.ndo_start_xmit		 = br_dev_xmit,
	.ndo_get_stats64	 = br_get_stats64,
	.ndo_set_mac_address	 = br_set_mac_address,
	.ndo_set_rx_mode	 = br_dev_set_multicast_list,
	.ndo_change_rx_flags	 = br_dev_change_rx_flags,
	.ndo_change_mtu		 = br_change_mtu,
	.ndo_do_ioctl		 = br_dev_ioctl,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_netpoll_setup	 = br_netpoll_setup,
	.ndo_netpoll_cleanup	 = br_netpoll_cleanup,
	.ndo_poll_controller	 = br_poll_controller,
#endif
	.ndo_add_slave		 = br_add_slave,
	.ndo_del_slave		 = br_del_slave,
	.ndo_fix_features        = br_fix_features,
	.ndo_fdb_add		 = br_fdb_add,
	.ndo_fdb_del		 = br_fdb_delete,
	.ndo_fdb_dump		 = br_fdb_dump,
	.ndo_fdb_get		 = br_fdb_get,
	.ndo_bridge_getlink	 = br_getlink,
	.ndo_bridge_setlink	 = br_setlink,
	.ndo_bridge_dellink	 = br_dellink,
	.ndo_features_check	 = passthru_features_check,
};

static struct device_type br_type = {
	.name	= "bridge",
};

void br_dev_setup(struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);

	eth_hw_addr_random(dev);
	ether_setup(dev);

	dev->netdev_ops = &br_netdev_ops;
	dev->needs_free_netdev = true;
	dev->ethtool_ops = &br_ethtool_ops;
	SET_NETDEV_DEVTYPE(dev, &br_type);
	dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;

	dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
			NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
	dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
			   NETIF_F_HW_VLAN_STAG_TX;
	dev->vlan_features = COMMON_FEATURES;

	br->dev = dev;
	spin_lock_init(&br->lock);
	INIT_LIST_HEAD(&br->port_list);
	INIT_HLIST_HEAD(&br->fdb_list);
#if IS_ENABLED(CONFIG_BRIDGE_MRP)
	INIT_LIST_HEAD(&br->mrp_list);
#endif
	spin_lock_init(&br->hash_lock);

	br->bridge_id.prio[0] = 0x80;
	br->bridge_id.prio[1] = 0x00;

	ether_addr_copy(br->group_addr, eth_stp_addr);

	br->stp_enabled = BR_NO_STP;
	br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
	br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;

	br->designated_root = br->bridge_id;
	br->bridge_max_age = br->max_age = 20 * HZ;
	br->bridge_hello_time = br->hello_time = 2 * HZ;
	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
	dev->max_mtu = ETH_MAX_MTU;

	br_netfilter_rtable_init(br);
	br_stp_timer_init(br);
	br_multicast_init(br);
	INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
}
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* Device handling code
	4	* Linux ethernet bridge
	5	*
	6	* Authors:
	7	* Lennert Buytenhek <buytenh@gnu.org>
1da177e4 LT	8	*/
	9
	10	#include <linux/kernel.h>
	11	#include <linux/netdevice.h>
c06ee961	12	#include <linux/netpoll.h>
4505a3ef	13	#include <linux/etherdevice.h>
edb5e46f	14	#include <linux/ethtool.h>
c06ee961	15	#include <linux/list.h>
ea2d9b41	16	#include <linux/netfilter_bridge.h>
4505a3ef	17
7c0f6ba6	18	#include <linux/uaccess.h>
1da177e4 LT	19	#include "br_private.h"
1da177e4 LT	20
161f65ba VY	21	#define COMMON_FEATURES (NETIF_F_SG \| NETIF_F_FRAGLIST \| NETIF_F_HIGHDMA \| \
	22	NETIF_F_GSO_MASK \| NETIF_F_HW_CSUM)
	23
1a4ba64d PNA	24	const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
	25	EXPORT_SYMBOL_GPL(nf_br_ops);
	26
eeaf61d8	27	/* net device transmit always called with BH disabled */
6fef4c0c	28	netdev_tx_t br_dev_xmit(struct sk_buff skb, struct net_device dev)
1da177e4 LT	29	{
1da177e4 LT	30	struct net_bridge *br = netdev_priv(dev);
1da177e4	31	struct net_bridge_fdb_entry *dst;
c4fcb78c	32	struct net_bridge_mdb_entry *mdst;
8f84985f	33	struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
1a4ba64d	34	const struct nf_br_ops *nf_ops;
a580c76d	35	u8 state = BR_STATE_FORWARDING;
31a4562d	36	const unsigned char *dest;
78851988	37	u16 vid = 0;
1da177e4	38
c03307ea	39	rcu_read_lock();
1a4ba64d PNA	40	nf_ops = rcu_dereference(nf_br_ops);
1a4ba64d PNA	41	if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
c03307ea	42	rcu_read_unlock();
ea2d9b41 BDS	43	return NETDEV_TX_OK;
ea2d9b41 BDS	44	}
ea2d9b41	45
406818ff	46	u64_stats_update_begin(&brstats->syncp);
14bb4789	47	brstats->tx_packets++;
14bb4789	48	brstats->tx_bytes += skb->len;
406818ff	49	u64_stats_update_end(&brstats->syncp);
6088a539	50
f1c2eddf	51	br_switchdev_frame_unmark(skb);
14bb4789	52	BR_INPUT_SKB_CB(skb)->brdev = dev;
3c171f49	53	BR_INPUT_SKB_CB(skb)->frag_max_size = 0;
1da177e4	54
459a98ed	55	skb_reset_mac_header(skb);
1da177e4 LT	56	skb_pull(skb, ETH_HLEN);
1da177e4 LT	57
a580c76d	58	if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid, &state))
12464bb8 TM	59	goto out;
12464bb8 TM	60
057658cb	61	if (IS_ENABLED(CONFIG_INET) &&
823d81b0 NA	62	(eth_hdr(skb)->h_proto == htons(ETH_P_ARP) \|\|
823d81b0 NA	63	eth_hdr(skb)->h_proto == htons(ETH_P_RARP)) &&
c69c2cd4	64	br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
057658cb	65	br_do_proxy_suppress_arp(skb, br, vid, NULL);
ed842fae RP	66	} else if (IS_ENABLED(CONFIG_IPV6) &&
ed842fae RP	67	skb->protocol == htons(ETH_P_IPV6) &&
c69c2cd4	68	br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
ed842fae RP	69	pskb_may_pull(skb, sizeof(struct ipv6hdr) +
	70	sizeof(struct nd_msg)) &&
	71	ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
	72	struct nd_msg *msg, _msg;
	73
	74	msg = br_is_nd_neigh_msg(skb, &_msg);
	75	if (msg)
	76	br_do_suppress_nd(skb, br, vid, NULL, msg);
057658cb RP	77	}
057658cb RP	78
31a4562d	79	dest = eth_hdr(skb)->h_dest;
37b090e6	80	if (is_broadcast_ether_addr(dest)) {
8addd5e7	81	br_flood(br, skb, BR_PKT_BROADCAST, false, true);
37b090e6	82	} else if (is_multicast_ether_addr(dest)) {
91d2c34a	83	if (unlikely(netpoll_tx_running(dev))) {
8addd5e7	84	br_flood(br, skb, BR_PKT_MULTICAST, false, true);
91d2c34a HX	85	goto out;
91d2c34a HX	86	}
06499098	87	if (br_multicast_rcv(br, NULL, skb, vid)) {
6d1d1d39	88	kfree_skb(skb);
c4fcb78c	89	goto out;
6d1d1d39	90	}
c4fcb78c	91
fbca58a2	92	mdst = br_mdb_get(br, skb, vid);
b00589af	93	if ((mdst \|\| BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
cc0fdd80	94	br_multicast_querier_exists(br, eth_hdr(skb)))
37b090e6	95	br_multicast_flood(mdst, skb, false, true);
c4fcb78c	96	else
8addd5e7	97	br_flood(br, skb, BR_PKT_MULTICAST, false, true);
bfd0aeac	98	} else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
37b090e6 NA	99	br_forward(dst->dst, skb, false, true);
37b090e6 NA	100	} else {
8addd5e7	101	br_flood(br, skb, BR_PKT_UNICAST, false, true);
37b090e6	102	}
c4fcb78c	103	out:
eeaf61d8	104	rcu_read_unlock();
6ed10654	105	return NETDEV_TX_OK;
1da177e4 LT	106	}
1da177e4 LT	107
bb900b27	108	static int br_dev_init(struct net_device *dev)
	109	{
	110	struct net_bridge *br = netdev_priv(dev);
5be5a2df	111	int err;
bb900b27	112
1c213bd2	113	br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
bb900b27	114	if (!br->stats)
	115	return -ENOMEM;
	116
eb793583 NA	117	err = br_fdb_hash_init(br);
	118	if (err) {
	119	free_percpu(br->stats);
	120	return err;
	121	}
	122
19e3a9c9 NA	123	err = br_mdb_hash_init(br);
	124	if (err) {
	125	free_percpu(br->stats);
	126	br_fdb_hash_fini(br);
	127	return err;
	128	}
	129
5be5a2df	130	err = br_vlan_init(br);
1080ab95	131	if (err) {
5be5a2df	132	free_percpu(br->stats);
19e3a9c9	133	br_mdb_hash_fini(br);
eb793583	134	br_fdb_hash_fini(br);
1080ab95 NA	135	return err;
	136	}
	137
	138	err = br_multicast_init_stats(br);
	139	if (err) {
	140	free_percpu(br->stats);
	141	br_vlan_flush(br);
19e3a9c9	142	br_mdb_hash_fini(br);
eb793583	143	br_fdb_hash_fini(br);
1080ab95	144	}
5be5a2df VY	145
5be5a2df VY	146	return err;
bb900b27	147	}
bb900b27	148
b6fe0440 IS	149	static void br_dev_uninit(struct net_device *dev)
	150	{
	151	struct net_bridge *br = netdev_priv(dev);
	152
b1b9d366	153	br_multicast_dev_del(br);
b6fe0440 IS	154	br_multicast_uninit_stats(br);
b6fe0440 IS	155	br_vlan_flush(br);
19e3a9c9	156	br_mdb_hash_fini(br);
eb793583	157	br_fdb_hash_fini(br);
b6fe0440 IS	158	free_percpu(br->stats);
	159	}
	160
1da177e4 LT	161	static int br_dev_open(struct net_device *dev)
1da177e4 LT	162	{
81d35307	163	struct net_bridge *br = netdev_priv(dev);
1da177e4	164
c4d27ef9	165	netdev_update_features(dev);
81d35307 SH	166	netif_start_queue(dev);
81d35307 SH	167	br_stp_enable_bridge(br);
3fe2d7c7	168	br_multicast_open(br);
1da177e4 LT	169
	170	return 0;
	171	}
	172
	173	static void br_dev_set_multicast_list(struct net_device *dev)
	174	{
	175	}
	176
2796d0c6 VY	177	static void br_dev_change_rx_flags(struct net_device *dev, int change)
	178	{
	179	if (change & IFF_PROMISC)
	180	br_manage_promisc(netdev_priv(dev));
	181	}
	182
1da177e4 LT	183	static int br_dev_stop(struct net_device *dev)
1da177e4 LT	184	{
3fe2d7c7 HX	185	struct net_bridge *br = netdev_priv(dev);
	186
	187	br_stp_disable_bridge(br);
	188	br_multicast_stop(br);
1da177e4 LT	189
	190	netif_stop_queue(dev);
	191
	192	return 0;
	193	}
	194
bc1f4470	195	static void br_get_stats64(struct net_device *dev,
bc1f4470	196	struct rtnl_link_stats64 *stats)
14bb4789	197	{
14bb4789	198	struct net_bridge *br = netdev_priv(dev);
8f84985f	199	struct pcpu_sw_netstats tmp, sum = { 0 };
14bb4789	200	unsigned int cpu;
	201
	202	for_each_possible_cpu(cpu) {
406818ff	203	unsigned int start;
8f84985f	204	const struct pcpu_sw_netstats *bstats
14bb4789	205	= per_cpu_ptr(br->stats, cpu);
406818ff	206	do {
57a7744e	207	start = u64_stats_fetch_begin_irq(&bstats->syncp);
406818ff	208	memcpy(&tmp, bstats, sizeof(tmp));
57a7744e	209	} while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
406818ff ED	210	sum.tx_bytes += tmp.tx_bytes;
	211	sum.tx_packets += tmp.tx_packets;
	212	sum.rx_bytes += tmp.rx_bytes;
	213	sum.rx_packets += tmp.rx_packets;
14bb4789	214	}
	215
	216	stats->tx_bytes = sum.tx_bytes;
	217	stats->tx_packets = sum.tx_packets;
	218	stats->rx_bytes = sum.rx_bytes;
	219	stats->rx_packets = sum.rx_packets;
14bb4789	220	}
14bb4789	221
1da177e4 LT	222	static int br_change_mtu(struct net_device *dev, int new_mtu)
1da177e4 LT	223	{
4adf0af6	224	struct net_bridge *br = netdev_priv(dev);
f40aa233	225
1da177e4	226	dev->mtu = new_mtu;
4adf0af6	227
804b854d	228	/* this flag will be cleared if the MTU was automatically adjusted */
3341d917	229	br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
34666d46	230	#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
4adf0af6	231	/* remember the MTU in the rtable for PMTU */
defb3519	232	dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
4adf0af6 SW	233	#endif
4adf0af6 SW	234
1da177e4 LT	235	return 0;
	236	}
	237
ffe1d49c	238	/* Allow setting mac address to any valid ethernet address. */
4505a3ef SH	239	static int br_set_mac_address(struct net_device dev, void p)
	240	{
	241	struct net_bridge *br = netdev_priv(dev);
	242	struct sockaddr *addr = p;
ffe1d49c SH	243
ffe1d49c SH	244	if (!is_valid_ether_addr(addr->sa_data))
7ca1e11a	245	return -EADDRNOTAVAIL;
4505a3ef	246
c4b4c421 NA	247	/* dev_set_mac_addr() can be called by a master device on bridge's
	248	* NETDEV_UNREGISTER, but since it's being destroyed do nothing
	249	*/
	250	if (dev->reg_state != NETREG_REGISTERED)
	251	return -EBUSY;
	252
4505a3ef	253	spin_lock_bh(&br->lock);
9a7b6ef9	254	if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
a3ebb7ef	255	/* Mac address will be changed in br_stp_change_bridge_id(). */
43598813	256	br_stp_change_bridge_id(br, addr->sa_data);
43598813	257	}
4505a3ef SH	258	spin_unlock_bh(&br->lock);
4505a3ef SH	259
ffe1d49c	260	return 0;
4505a3ef SH	261	}
4505a3ef SH	262
edb5e46f SH	263	static void br_getinfo(struct net_device dev, struct ethtool_drvinfo info)
edb5e46f SH	264	{
7826d43f JP	265	strlcpy(info->driver, "bridge", sizeof(info->driver));
	266	strlcpy(info->version, BR_VERSION, sizeof(info->version));
	267	strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
	268	strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
edb5e46f SH	269	}
edb5e46f SH	270
542575fe MS	271	static int br_get_link_ksettings(struct net_device *dev,
	272	struct ethtool_link_ksettings *cmd)
	273	{
	274	struct net_bridge *br = netdev_priv(dev);
	275	struct net_bridge_port *p;
	276
	277	cmd->base.duplex = DUPLEX_UNKNOWN;
	278	cmd->base.port = PORT_OTHER;
	279	cmd->base.speed = SPEED_UNKNOWN;
	280
	281	list_for_each_entry(p, &br->port_list, list) {
	282	struct ethtool_link_ksettings ecmd;
	283	struct net_device *pdev = p->dev;
	284
	285	if (!netif_running(pdev) \|\| !netif_oper_up(pdev))
	286	continue;
	287
	288	if (__ethtool_get_link_ksettings(pdev, &ecmd))
	289	continue;
	290
	291	if (ecmd.base.speed == (__u32)SPEED_UNKNOWN)
	292	continue;
	293
	294	if (cmd->base.speed == (__u32)SPEED_UNKNOWN \|\|
	295	cmd->base.speed < ecmd.base.speed)
	296	cmd->base.speed = ecmd.base.speed;
	297	}
	298
	299	return 0;
	300	}
	301
c8f44aff MM	302	static netdev_features_t br_fix_features(struct net_device *dev,
c8f44aff MM	303	netdev_features_t features)
edb5e46f SH	304	{
	305	struct net_bridge *br = netdev_priv(dev);
	306
c4d27ef9	307	return br_features_recompute(br, features);
361ff8a6 JG	308	}
361ff8a6 JG	309
c06ee961	310	#ifdef CONFIG_NET_POLL_CONTROLLER
91d2c34a	311	static void br_poll_controller(struct net_device *br_dev)
c06ee961	312	{
c06ee961 WC	313	}
c06ee961 WC	314
91d2c34a	315	static void br_netpoll_cleanup(struct net_device *dev)
c06ee961	316	{
91d2c34a	317	struct net_bridge *br = netdev_priv(dev);
4e3828c4	318	struct net_bridge_port *p;
c06ee961	319
4e3828c4	320	list_for_each_entry(p, &br->port_list, list)
91d2c34a	321	br_netpoll_disable(p);
c06ee961 WC	322	}
c06ee961 WC	323
a8779ec1	324	static int __br_netpoll_enable(struct net_bridge_port *p)
dbe17307 CW	325	{
	326	struct netpoll *np;
	327	int err;
	328
a8779ec1	329	np = kzalloc(sizeof(*p->np), GFP_KERNEL);
dbe17307 CW	330	if (!np)
	331	return -ENOMEM;
	332
a8779ec1	333	err = __netpoll_setup(np, p->dev);
dbe17307 CW	334	if (err) {
	335	kfree(np);
	336	return err;
	337	}
	338
	339	p->np = np;
	340	return err;
	341	}
	342
a8779ec1	343	int br_netpoll_enable(struct net_bridge_port *p)
dbe17307 CW	344	{
	345	if (!p->br->dev->npinfo)
	346	return 0;
	347
a8779ec1	348	return __br_netpoll_enable(p);
dbe17307 CW	349	}
dbe17307 CW	350
a8779ec1	351	static int br_netpoll_setup(struct net_device dev, struct netpoll_info ni)
c06ee961	352	{
cfb478da	353	struct net_bridge *br = netdev_priv(dev);
4e3828c4	354	struct net_bridge_port *p;
91d2c34a	355	int err = 0;
c06ee961	356
4e3828c4	357	list_for_each_entry(p, &br->port_list, list) {
91d2c34a HX	358	if (!p->dev)
91d2c34a HX	359	continue;
a8779ec1	360	err = __br_netpoll_enable(p);
91d2c34a HX	361	if (err)
91d2c34a HX	362	goto fail;
c06ee961	363	}
91d2c34a HX	364
	365	out:
	366	return err;
	367
	368	fail:
	369	br_netpoll_cleanup(dev);
	370	goto out;
c06ee961 WC	371	}
c06ee961 WC	372
91d2c34a	373	void br_netpoll_disable(struct net_bridge_port *p)
c06ee961	374	{
91d2c34a HX	375	struct netpoll *np = p->np;
	376
	377	if (!np)
	378	return;
	379
	380	p->np = NULL;
	381
c9fbd71f	382	__netpoll_free(np);
c06ee961 WC	383	}
	384
	385	#endif
	386
33eaf2a6 DA	387	static int br_add_slave(struct net_device dev, struct net_device slave_dev,
33eaf2a6 DA	388	struct netlink_ext_ack *extack)
afc6151a JP	389
	390	{
	391	struct net_bridge *br = netdev_priv(dev);
	392
ca752be0	393	return br_add_if(br, slave_dev, extack);
afc6151a JP	394	}
	395
	396	static int br_del_slave(struct net_device dev, struct net_device slave_dev)
	397	{
	398	struct net_bridge *br = netdev_priv(dev);
	399
	400	return br_del_if(br, slave_dev);
	401	}
	402
a2dbb882	403	static const struct ethtool_ops br_ethtool_ops = {
542575fe MS	404	.get_drvinfo = br_getinfo,
	405	.get_link = ethtool_op_get_link,
	406	.get_link_ksettings = br_get_link_ksettings,
edb5e46f SH	407	};
edb5e46f SH	408
a2dbb882 SH	409	static const struct net_device_ops br_netdev_ops = {
	410	.ndo_open = br_dev_open,
	411	.ndo_stop = br_dev_stop,
bb900b27	412	.ndo_init = br_dev_init,
b6fe0440	413	.ndo_uninit = br_dev_uninit,
00829823	414	.ndo_start_xmit = br_dev_xmit,
406818ff	415	.ndo_get_stats64 = br_get_stats64,
00829823	416	.ndo_set_mac_address = br_set_mac_address,
afc4b13d	417	.ndo_set_rx_mode = br_dev_set_multicast_list,
2796d0c6	418	.ndo_change_rx_flags = br_dev_change_rx_flags,
00829823 SH	419	.ndo_change_mtu = br_change_mtu,
00829823 SH	420	.ndo_do_ioctl = br_dev_ioctl,
c06ee961	421	#ifdef CONFIG_NET_POLL_CONTROLLER
91d2c34a	422	.ndo_netpoll_setup = br_netpoll_setup,
c06ee961 WC	423	.ndo_netpoll_cleanup = br_netpoll_cleanup,
	424	.ndo_poll_controller = br_poll_controller,
	425	#endif
afc6151a JP	426	.ndo_add_slave = br_add_slave,
afc6151a JP	427	.ndo_del_slave = br_del_slave,
c4d27ef9	428	.ndo_fix_features = br_fix_features,
77162022 JF	429	.ndo_fdb_add = br_fdb_add,
	430	.ndo_fdb_del = br_fdb_delete,
	431	.ndo_fdb_dump = br_fdb_dump,
47674562	432	.ndo_fdb_get = br_fdb_get,
e5a55a89 JF	433	.ndo_bridge_getlink = br_getlink,
e5a55a89 JF	434	.ndo_bridge_setlink = br_setlink,
407af329	435	.ndo_bridge_dellink = br_dellink,
66780530	436	.ndo_features_check = passthru_features_check,
a2dbb882 SH	437	};
a2dbb882 SH	438
bb900b27	439	static struct device_type br_type = {
	440	.name = "bridge",
	441	};
	442
1da177e4 LT	443	void br_dev_setup(struct net_device *dev)
1da177e4 LT	444	{
bb900b27	445	struct net_bridge *br = netdev_priv(dev);
bb900b27	446
7ce5d222	447	eth_hw_addr_random(dev);
1da177e4 LT	448	ether_setup(dev);
1da177e4 LT	449
a2dbb882	450	dev->netdev_ops = &br_netdev_ops;
cf124db5	451	dev->needs_free_netdev = true;
7ad24ea4	452	dev->ethtool_ops = &br_ethtool_ops;
bb900b27	453	SET_NETDEV_DEVTYPE(dev, &br_type);
ccecb2a4	454	dev->priv_flags = IFF_EBRIDGE \| IFF_NO_QUEUE;
edb5e46f	455
161f65ba	456	dev->features = COMMON_FEATURES \| NETIF_F_LLTX \| NETIF_F_NETNS_LOCAL \|
1c5abb6c TM	457	NETIF_F_HW_VLAN_CTAG_TX \| NETIF_F_HW_VLAN_STAG_TX;
	458	dev->hw_features = COMMON_FEATURES \| NETIF_F_HW_VLAN_CTAG_TX \|
	459	NETIF_F_HW_VLAN_STAG_TX;
161f65ba	460	dev->vlan_features = COMMON_FEATURES;
bb900b27	461
	462	br->dev = dev;
	463	spin_lock_init(&br->lock);
	464	INIT_LIST_HEAD(&br->port_list);
eb793583	465	INIT_HLIST_HEAD(&br->fdb_list);
65369933 HV	466	#if IS_ENABLED(CONFIG_BRIDGE_MRP)
	467	INIT_LIST_HEAD(&br->mrp_list);
	468	#endif
bb900b27	469	spin_lock_init(&br->hash_lock);
	470
	471	br->bridge_id.prio[0] = 0x80;
	472	br->bridge_id.prio[1] = 0x00;
	473
05428729	474	ether_addr_copy(br->group_addr, eth_stp_addr);
bb900b27	475
bb900b27	476	br->stp_enabled = BR_NO_STP;
515853cc	477	br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
f2808d22	478	br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
515853cc	479
bb900b27	480	br->designated_root = br->bridge_id;
	481	br->bridge_max_age = br->max_age = 20 * HZ;
	482	br->bridge_hello_time = br->hello_time = 2 * HZ;
	483	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
34d8acd8	484	br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
91572088	485	dev->max_mtu = ETH_MAX_MTU;
bb900b27	486
	487	br_netfilter_rtable_init(br);
	488	br_stp_timer_init(br);
	489	br_multicast_init(br);
f7cdee8a	490	INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
1da177e4	491	}