[linux.git] / net / bridge / br_device.c

/*
 *	Device handling code
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<[email protected]>
 *
 *	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/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);

static struct lock_class_key bridge_netdev_addr_lock_key;

/* 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;
	const unsigned char *dest;
	struct ethhdr *eth;
	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;

	skb_reset_mac_header(skb);
	eth = eth_hdr(skb);
	skb_pull(skb, ETH_HLEN);

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

	if (IS_ENABLED(CONFIG_INET) &&
	    (eth->h_proto == htons(ETH_P_ARP) ||
	     eth->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 void br_set_lockdep_class(struct net_device *dev)
{
	lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
}

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

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

	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_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;

	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 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,
};

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_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);
	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
1da177e4 LT	1	/*
	2	* Device handling code
	3	* Linux ethernet bridge
	4	*
	5	* Authors:
	6	* Lennert Buytenhek <[email protected]>
	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
	14	#include <linux/kernel.h>
	15	#include <linux/netdevice.h>
c06ee961	16	#include <linux/netpoll.h>
4505a3ef	17	#include <linux/etherdevice.h>
edb5e46f	18	#include <linux/ethtool.h>
c06ee961	19	#include <linux/list.h>
ea2d9b41	20	#include <linux/netfilter_bridge.h>
4505a3ef	21
7c0f6ba6	22	#include <linux/uaccess.h>
1da177e4 LT	23	#include "br_private.h"
1da177e4 LT	24
161f65ba VY	25	#define COMMON_FEATURES (NETIF_F_SG \| NETIF_F_FRAGLIST \| NETIF_F_HIGHDMA \| \
	26	NETIF_F_GSO_MASK \| NETIF_F_HW_CSUM)
	27
1a4ba64d PNA	28	const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
	29	EXPORT_SYMBOL_GPL(nf_br_ops);
	30
c6894dec NA	31	static struct lock_class_key bridge_netdev_addr_lock_key;
c6894dec NA	32
eeaf61d8	33	/* net device transmit always called with BH disabled */
6fef4c0c	34	netdev_tx_t br_dev_xmit(struct sk_buff skb, struct net_device dev)
1da177e4 LT	35	{
1da177e4 LT	36	struct net_bridge *br = netdev_priv(dev);
1da177e4	37	struct net_bridge_fdb_entry *dst;
c4fcb78c	38	struct net_bridge_mdb_entry *mdst;
8f84985f	39	struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
1a4ba64d	40	const struct nf_br_ops *nf_ops;
31a4562d	41	const unsigned char *dest;
057658cb	42	struct ethhdr *eth;
78851988	43	u16 vid = 0;
1da177e4	44
c03307ea	45	rcu_read_lock();
1a4ba64d PNA	46	nf_ops = rcu_dereference(nf_br_ops);
1a4ba64d PNA	47	if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
c03307ea	48	rcu_read_unlock();
ea2d9b41 BDS	49	return NETDEV_TX_OK;
ea2d9b41 BDS	50	}
ea2d9b41	51
406818ff	52	u64_stats_update_begin(&brstats->syncp);
14bb4789	53	brstats->tx_packets++;
14bb4789	54	brstats->tx_bytes += skb->len;
406818ff	55	u64_stats_update_end(&brstats->syncp);
6088a539	56
f1c2eddf	57	br_switchdev_frame_unmark(skb);
14bb4789	58	BR_INPUT_SKB_CB(skb)->brdev = dev;
1da177e4	59
459a98ed	60	skb_reset_mac_header(skb);
057658cb	61	eth = eth_hdr(skb);
1da177e4 LT	62	skb_pull(skb, ETH_HLEN);
1da177e4 LT	63
907b1e6e	64	if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
12464bb8 TM	65	goto out;
12464bb8 TM	66
057658cb RP	67	if (IS_ENABLED(CONFIG_INET) &&
	68	(eth->h_proto == htons(ETH_P_ARP) \|\|
	69	eth->h_proto == htons(ETH_P_RARP)) &&
c69c2cd4	70	br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
057658cb	71	br_do_proxy_suppress_arp(skb, br, vid, NULL);
ed842fae RP	72	} else if (IS_ENABLED(CONFIG_IPV6) &&
ed842fae RP	73	skb->protocol == htons(ETH_P_IPV6) &&
c69c2cd4	74	br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
ed842fae RP	75	pskb_may_pull(skb, sizeof(struct ipv6hdr) +
	76	sizeof(struct nd_msg)) &&
	77	ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
	78	struct nd_msg *msg, _msg;
	79
	80	msg = br_is_nd_neigh_msg(skb, &_msg);
	81	if (msg)
	82	br_do_suppress_nd(skb, br, vid, NULL, msg);
057658cb RP	83	}
057658cb RP	84
31a4562d	85	dest = eth_hdr(skb)->h_dest;
37b090e6	86	if (is_broadcast_ether_addr(dest)) {
8addd5e7	87	br_flood(br, skb, BR_PKT_BROADCAST, false, true);
37b090e6	88	} else if (is_multicast_ether_addr(dest)) {
91d2c34a	89	if (unlikely(netpoll_tx_running(dev))) {
8addd5e7	90	br_flood(br, skb, BR_PKT_MULTICAST, false, true);
91d2c34a HX	91	goto out;
91d2c34a HX	92	}
06499098	93	if (br_multicast_rcv(br, NULL, skb, vid)) {
6d1d1d39	94	kfree_skb(skb);
c4fcb78c	95	goto out;
6d1d1d39	96	}
c4fcb78c	97
fbca58a2	98	mdst = br_mdb_get(br, skb, vid);
b00589af	99	if ((mdst \|\| BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
cc0fdd80	100	br_multicast_querier_exists(br, eth_hdr(skb)))
37b090e6	101	br_multicast_flood(mdst, skb, false, true);
c4fcb78c	102	else
8addd5e7	103	br_flood(br, skb, BR_PKT_MULTICAST, false, true);
bfd0aeac	104	} else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
37b090e6 NA	105	br_forward(dst->dst, skb, false, true);
37b090e6 NA	106	} else {
8addd5e7	107	br_flood(br, skb, BR_PKT_UNICAST, false, true);
37b090e6	108	}
c4fcb78c	109	out:
eeaf61d8	110	rcu_read_unlock();
6ed10654	111	return NETDEV_TX_OK;
1da177e4 LT	112	}
1da177e4 LT	113
c6894dec NA	114	static void br_set_lockdep_class(struct net_device *dev)
	115	{
	116	lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
	117	}
	118
bb900b27	119	static int br_dev_init(struct net_device *dev)
	120	{
	121	struct net_bridge *br = netdev_priv(dev);
5be5a2df	122	int err;
bb900b27	123
1c213bd2	124	br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
bb900b27	125	if (!br->stats)
	126	return -ENOMEM;
	127
eb793583 NA	128	err = br_fdb_hash_init(br);
	129	if (err) {
	130	free_percpu(br->stats);
	131	return err;
	132	}
	133
5be5a2df	134	err = br_vlan_init(br);
1080ab95	135	if (err) {
5be5a2df	136	free_percpu(br->stats);
eb793583	137	br_fdb_hash_fini(br);
1080ab95 NA	138	return err;
	139	}
	140
	141	err = br_multicast_init_stats(br);
	142	if (err) {
	143	free_percpu(br->stats);
	144	br_vlan_flush(br);
eb793583	145	br_fdb_hash_fini(br);
1080ab95	146	}
c6894dec	147	br_set_lockdep_class(dev);
5be5a2df VY	148
5be5a2df VY	149	return err;
bb900b27	150	}
bb900b27	151
b6fe0440 IS	152	static void br_dev_uninit(struct net_device *dev)
	153	{
	154	struct net_bridge *br = netdev_priv(dev);
	155
b1b9d366	156	br_multicast_dev_del(br);
b6fe0440 IS	157	br_multicast_uninit_stats(br);
b6fe0440 IS	158	br_vlan_flush(br);
eb793583	159	br_fdb_hash_fini(br);
b6fe0440 IS	160	free_percpu(br->stats);
	161	}
	162
1da177e4 LT	163	static int br_dev_open(struct net_device *dev)
1da177e4 LT	164	{
81d35307	165	struct net_bridge *br = netdev_priv(dev);
1da177e4	166
c4d27ef9	167	netdev_update_features(dev);
81d35307 SH	168	netif_start_queue(dev);
81d35307 SH	169	br_stp_enable_bridge(br);
3fe2d7c7	170	br_multicast_open(br);
1da177e4 LT	171
	172	return 0;
	173	}
	174
	175	static void br_dev_set_multicast_list(struct net_device *dev)
	176	{
	177	}
	178
2796d0c6 VY	179	static void br_dev_change_rx_flags(struct net_device *dev, int change)
	180	{
	181	if (change & IFF_PROMISC)
	182	br_manage_promisc(netdev_priv(dev));
	183	}
	184
1da177e4 LT	185	static int br_dev_stop(struct net_device *dev)
1da177e4 LT	186	{
3fe2d7c7 HX	187	struct net_bridge *br = netdev_priv(dev);
	188
	189	br_stp_disable_bridge(br);
	190	br_multicast_stop(br);
1da177e4 LT	191
	192	netif_stop_queue(dev);
	193
	194	return 0;
	195	}
	196
bc1f4470	197	static void br_get_stats64(struct net_device *dev,
bc1f4470	198	struct rtnl_link_stats64 *stats)
14bb4789	199	{
14bb4789	200	struct net_bridge *br = netdev_priv(dev);
8f84985f	201	struct pcpu_sw_netstats tmp, sum = { 0 };
14bb4789	202	unsigned int cpu;
	203
	204	for_each_possible_cpu(cpu) {
406818ff	205	unsigned int start;
8f84985f	206	const struct pcpu_sw_netstats *bstats
14bb4789	207	= per_cpu_ptr(br->stats, cpu);
406818ff	208	do {
57a7744e	209	start = u64_stats_fetch_begin_irq(&bstats->syncp);
406818ff	210	memcpy(&tmp, bstats, sizeof(tmp));
57a7744e	211	} while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
406818ff ED	212	sum.tx_bytes += tmp.tx_bytes;
	213	sum.tx_packets += tmp.tx_packets;
	214	sum.rx_bytes += tmp.rx_bytes;
	215	sum.rx_packets += tmp.rx_packets;
14bb4789	216	}
	217
	218	stats->tx_bytes = sum.tx_bytes;
	219	stats->tx_packets = sum.tx_packets;
	220	stats->rx_bytes = sum.rx_bytes;
	221	stats->rx_packets = sum.rx_packets;
14bb4789	222	}
14bb4789	223
1da177e4 LT	224	static int br_change_mtu(struct net_device *dev, int new_mtu)
1da177e4 LT	225	{
4adf0af6	226	struct net_bridge *br = netdev_priv(dev);
f40aa233	227
1da177e4	228	dev->mtu = new_mtu;
4adf0af6	229
804b854d	230	/* this flag will be cleared if the MTU was automatically adjusted */
3341d917	231	br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
34666d46	232	#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
4adf0af6	233	/* remember the MTU in the rtable for PMTU */
defb3519	234	dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
4adf0af6 SW	235	#endif
4adf0af6 SW	236
1da177e4 LT	237	return 0;
	238	}
	239
ffe1d49c	240	/* Allow setting mac address to any valid ethernet address. */
4505a3ef SH	241	static int br_set_mac_address(struct net_device dev, void p)
	242	{
	243	struct net_bridge *br = netdev_priv(dev);
	244	struct sockaddr *addr = p;
ffe1d49c SH	245
ffe1d49c SH	246	if (!is_valid_ether_addr(addr->sa_data))
7ca1e11a	247	return -EADDRNOTAVAIL;
4505a3ef SH	248
4505a3ef SH	249	spin_lock_bh(&br->lock);
9a7b6ef9	250	if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
a3ebb7ef	251	/* Mac address will be changed in br_stp_change_bridge_id(). */
43598813	252	br_stp_change_bridge_id(br, addr->sa_data);
43598813	253	}
4505a3ef SH	254	spin_unlock_bh(&br->lock);
4505a3ef SH	255
ffe1d49c	256	return 0;
4505a3ef SH	257	}
4505a3ef SH	258
edb5e46f SH	259	static void br_getinfo(struct net_device dev, struct ethtool_drvinfo info)
edb5e46f SH	260	{
7826d43f JP	261	strlcpy(info->driver, "bridge", sizeof(info->driver));
	262	strlcpy(info->version, BR_VERSION, sizeof(info->version));
	263	strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
	264	strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
edb5e46f SH	265	}
edb5e46f SH	266
c8f44aff MM	267	static netdev_features_t br_fix_features(struct net_device *dev,
c8f44aff MM	268	netdev_features_t features)
edb5e46f SH	269	{
	270	struct net_bridge *br = netdev_priv(dev);
	271
c4d27ef9	272	return br_features_recompute(br, features);
361ff8a6 JG	273	}
361ff8a6 JG	274
c06ee961	275	#ifdef CONFIG_NET_POLL_CONTROLLER
91d2c34a	276	static void br_poll_controller(struct net_device *br_dev)
c06ee961	277	{
c06ee961 WC	278	}
c06ee961 WC	279
91d2c34a	280	static void br_netpoll_cleanup(struct net_device *dev)
c06ee961	281	{
91d2c34a	282	struct net_bridge *br = netdev_priv(dev);
4e3828c4	283	struct net_bridge_port *p;
c06ee961	284
4e3828c4	285	list_for_each_entry(p, &br->port_list, list)
91d2c34a	286	br_netpoll_disable(p);
c06ee961 WC	287	}
c06ee961 WC	288
a8779ec1	289	static int __br_netpoll_enable(struct net_bridge_port *p)
dbe17307 CW	290	{
	291	struct netpoll *np;
	292	int err;
	293
a8779ec1	294	np = kzalloc(sizeof(*p->np), GFP_KERNEL);
dbe17307 CW	295	if (!np)
	296	return -ENOMEM;
	297
a8779ec1	298	err = __netpoll_setup(np, p->dev);
dbe17307 CW	299	if (err) {
	300	kfree(np);
	301	return err;
	302	}
	303
	304	p->np = np;
	305	return err;
	306	}
	307
a8779ec1	308	int br_netpoll_enable(struct net_bridge_port *p)
dbe17307 CW	309	{
	310	if (!p->br->dev->npinfo)
	311	return 0;
	312
a8779ec1	313	return __br_netpoll_enable(p);
dbe17307 CW	314	}
dbe17307 CW	315
a8779ec1	316	static int br_netpoll_setup(struct net_device dev, struct netpoll_info ni)
c06ee961	317	{
cfb478da	318	struct net_bridge *br = netdev_priv(dev);
4e3828c4	319	struct net_bridge_port *p;
91d2c34a	320	int err = 0;
c06ee961	321
4e3828c4	322	list_for_each_entry(p, &br->port_list, list) {
91d2c34a HX	323	if (!p->dev)
91d2c34a HX	324	continue;
a8779ec1	325	err = __br_netpoll_enable(p);
91d2c34a HX	326	if (err)
91d2c34a HX	327	goto fail;
c06ee961	328	}
91d2c34a HX	329
	330	out:
	331	return err;
	332
	333	fail:
	334	br_netpoll_cleanup(dev);
	335	goto out;
c06ee961 WC	336	}
c06ee961 WC	337
91d2c34a	338	void br_netpoll_disable(struct net_bridge_port *p)
c06ee961	339	{
91d2c34a HX	340	struct netpoll *np = p->np;
	341
	342	if (!np)
	343	return;
	344
	345	p->np = NULL;
	346
c9fbd71f	347	__netpoll_free(np);
c06ee961 WC	348	}
	349
	350	#endif
	351
33eaf2a6 DA	352	static int br_add_slave(struct net_device dev, struct net_device slave_dev,
33eaf2a6 DA	353	struct netlink_ext_ack *extack)
afc6151a JP	354
	355	{
	356	struct net_bridge *br = netdev_priv(dev);
	357
ca752be0	358	return br_add_if(br, slave_dev, extack);
afc6151a JP	359	}
	360
	361	static int br_del_slave(struct net_device dev, struct net_device slave_dev)
	362	{
	363	struct net_bridge *br = netdev_priv(dev);
	364
	365	return br_del_if(br, slave_dev);
	366	}
	367
a2dbb882	368	static const struct ethtool_ops br_ethtool_ops = {
e4119a43 SH	369	.get_drvinfo = br_getinfo,
e4119a43 SH	370	.get_link = ethtool_op_get_link,
edb5e46f SH	371	};
edb5e46f SH	372
a2dbb882 SH	373	static const struct net_device_ops br_netdev_ops = {
	374	.ndo_open = br_dev_open,
	375	.ndo_stop = br_dev_stop,
bb900b27	376	.ndo_init = br_dev_init,
b6fe0440	377	.ndo_uninit = br_dev_uninit,
00829823	378	.ndo_start_xmit = br_dev_xmit,
406818ff	379	.ndo_get_stats64 = br_get_stats64,
00829823	380	.ndo_set_mac_address = br_set_mac_address,
afc4b13d	381	.ndo_set_rx_mode = br_dev_set_multicast_list,
2796d0c6	382	.ndo_change_rx_flags = br_dev_change_rx_flags,
00829823 SH	383	.ndo_change_mtu = br_change_mtu,
00829823 SH	384	.ndo_do_ioctl = br_dev_ioctl,
c06ee961	385	#ifdef CONFIG_NET_POLL_CONTROLLER
91d2c34a	386	.ndo_netpoll_setup = br_netpoll_setup,
c06ee961 WC	387	.ndo_netpoll_cleanup = br_netpoll_cleanup,
	388	.ndo_poll_controller = br_poll_controller,
	389	#endif
afc6151a JP	390	.ndo_add_slave = br_add_slave,
afc6151a JP	391	.ndo_del_slave = br_del_slave,
c4d27ef9	392	.ndo_fix_features = br_fix_features,
77162022 JF	393	.ndo_fdb_add = br_fdb_add,
	394	.ndo_fdb_del = br_fdb_delete,
	395	.ndo_fdb_dump = br_fdb_dump,
e5a55a89 JF	396	.ndo_bridge_getlink = br_getlink,
e5a55a89 JF	397	.ndo_bridge_setlink = br_setlink,
407af329	398	.ndo_bridge_dellink = br_dellink,
66780530	399	.ndo_features_check = passthru_features_check,
a2dbb882 SH	400	};
a2dbb882 SH	401
bb900b27	402	static struct device_type br_type = {
	403	.name = "bridge",
	404	};
	405
1da177e4 LT	406	void br_dev_setup(struct net_device *dev)
1da177e4 LT	407	{
bb900b27	408	struct net_bridge *br = netdev_priv(dev);
bb900b27	409
7ce5d222	410	eth_hw_addr_random(dev);
1da177e4 LT	411	ether_setup(dev);
1da177e4 LT	412
a2dbb882	413	dev->netdev_ops = &br_netdev_ops;
cf124db5	414	dev->needs_free_netdev = true;
7ad24ea4	415	dev->ethtool_ops = &br_ethtool_ops;
bb900b27	416	SET_NETDEV_DEVTYPE(dev, &br_type);
ccecb2a4	417	dev->priv_flags = IFF_EBRIDGE \| IFF_NO_QUEUE;
edb5e46f	418
161f65ba	419	dev->features = COMMON_FEATURES \| NETIF_F_LLTX \| NETIF_F_NETNS_LOCAL \|
1c5abb6c TM	420	NETIF_F_HW_VLAN_CTAG_TX \| NETIF_F_HW_VLAN_STAG_TX;
	421	dev->hw_features = COMMON_FEATURES \| NETIF_F_HW_VLAN_CTAG_TX \|
	422	NETIF_F_HW_VLAN_STAG_TX;
161f65ba	423	dev->vlan_features = COMMON_FEATURES;
bb900b27	424
	425	br->dev = dev;
	426	spin_lock_init(&br->lock);
	427	INIT_LIST_HEAD(&br->port_list);
eb793583	428	INIT_HLIST_HEAD(&br->fdb_list);
bb900b27	429	spin_lock_init(&br->hash_lock);
	430
	431	br->bridge_id.prio[0] = 0x80;
	432	br->bridge_id.prio[1] = 0x00;
	433
05428729	434	ether_addr_copy(br->group_addr, eth_stp_addr);
bb900b27	435
bb900b27	436	br->stp_enabled = BR_NO_STP;
515853cc	437	br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
f2808d22	438	br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
515853cc	439
bb900b27	440	br->designated_root = br->bridge_id;
	441	br->bridge_max_age = br->max_age = 20 * HZ;
	442	br->bridge_hello_time = br->hello_time = 2 * HZ;
	443	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
34d8acd8	444	br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
91572088	445	dev->max_mtu = ETH_MAX_MTU;
bb900b27	446
	447	br_netfilter_rtable_init(br);
	448	br_stp_timer_init(br);
	449	br_multicast_init(br);
f7cdee8a	450	INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
1da177e4	451	}