[linux-block.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_mcast_port *pmctx_null = NULL;
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_mcast *brmctx = &br->multicast_ctx;
	struct net_bridge_fdb_entry *dst;
	struct net_bridge_mdb_entry *mdst;
	const struct nf_br_ops *nf_ops;
	u8 state = BR_STATE_FORWARDING;
	struct net_bridge_vlan *vlan;
	const unsigned char *dest;
	u16 vid = 0;

	memset(skb->cb, 0, sizeof(struct br_input_skb_cb));

	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;
	}

	dev_sw_netstats_tx_add(dev, 1, skb->len);

	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, &vlan))
		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, vid);
	} else if (is_multicast_ether_addr(dest)) {
		if (unlikely(netpoll_tx_running(dev))) {
			br_flood(br, skb, BR_PKT_MULTICAST, false, true, vid);
			goto out;
		}
		if (br_multicast_rcv(&brmctx, &pmctx_null, vlan, skb, vid)) {
			kfree_skb(skb);
			goto out;
		}

		mdst = br_mdb_get(brmctx, skb, vid);
		if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
		    br_multicast_querier_exists(brmctx, eth_hdr(skb), mdst))
			br_multicast_flood(mdst, skb, brmctx, false, true);
		else
			br_flood(br, skb, BR_PKT_MULTICAST, false, true, vid);
	} 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, vid);
	}
out:
	rcu_read_unlock();
	return NETDEV_TX_OK;
}

static struct lock_class_key bridge_netdev_addr_lock_key;

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;

	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
	if (!dev->tstats)
		return -ENOMEM;

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

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

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

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

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);

	if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
		br_multicast_join_snoopers(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);

	if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
		br_multicast_leave_snoopers(br);

	netif_stop_queue(dev);

	return 0;
}

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)
{
	strscpy(info->driver, "bridge", sizeof(info->driver));
	strscpy(info->version, BR_VERSION, sizeof(info->version));
	strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
	strscpy(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 int br_fill_forward_path(struct net_device_path_ctx *ctx,
				struct net_device_path *path)
{
	struct net_bridge_fdb_entry *f;
	struct net_bridge_port *dst;
	struct net_bridge *br;

	if (netif_is_bridge_port(ctx->dev))
		return -1;

	br = netdev_priv(ctx->dev);

	br_vlan_fill_forward_path_pvid(br, ctx, path);

	f = br_fdb_find_rcu(br, ctx->daddr, path->bridge.vlan_id);
	if (!f || !f->dst)
		return -1;

	dst = READ_ONCE(f->dst);
	if (!dst)
		return -1;

	if (br_vlan_fill_forward_path_mode(br, dst, path))
		return -1;

	path->type = DEV_PATH_BRIDGE;
	path->dev = dst->br->dev;
	ctx->dev = dst->dev;

	switch (path->bridge.vlan_mode) {
	case DEV_PATH_BR_VLAN_TAG:
		if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
			return -ENOSPC;
		ctx->vlan[ctx->num_vlans].id = path->bridge.vlan_id;
		ctx->vlan[ctx->num_vlans].proto = path->bridge.vlan_proto;
		ctx->num_vlans++;
		break;
	case DEV_PATH_BR_VLAN_UNTAG_HW:
	case DEV_PATH_BR_VLAN_UNTAG:
		ctx->num_vlans--;
		break;
	case DEV_PATH_BR_VLAN_KEEP:
		break;
	}

	return 0;
}

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	 = dev_get_tstats64,
	.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_siocdevprivate	 = br_dev_siocdevprivate,
#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_del_bulk	 = br_fdb_delete_bulk,
	.ndo_fdb_dump		 = br_fdb_dump,
	.ndo_fdb_get		 = br_fdb_get,
	.ndo_mdb_add		 = br_mdb_add,
	.ndo_mdb_del		 = br_mdb_del,
	.ndo_mdb_dump		 = br_mdb_dump,
	.ndo_bridge_getlink	 = br_getlink,
	.ndo_bridge_setlink	 = br_setlink,
	.ndo_bridge_dellink	 = br_dellink,
	.ndo_features_check	 = passthru_features_check,
	.ndo_fill_forward_path	 = br_fill_forward_path,
};

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);
	INIT_HLIST_HEAD(&br->frame_type_list);
#if IS_ENABLED(CONFIG_BRIDGE_MRP)
	INIT_HLIST_HEAD(&br->mrp_list);
#endif
#if IS_ENABLED(CONFIG_BRIDGE_CFM)
	INIT_HLIST_HEAD(&br->mep_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	29	{
f4b7002a	30	struct net_bridge_mcast_port *pmctx_null = NULL;
1da177e4	31	struct net_bridge *br = netdev_priv(dev);
adc47037	32	struct net_bridge_mcast *brmctx = &br->multicast_ctx;
1da177e4	33	struct net_bridge_fdb_entry *dst;
c4fcb78c	34	struct net_bridge_mdb_entry *mdst;
1a4ba64d	35	const struct nf_br_ops *nf_ops;
a580c76d	36	u8 state = BR_STATE_FORWARDING;
f4b7002a	37	struct net_bridge_vlan *vlan;
31a4562d	38	const unsigned char *dest;
78851988	39	u16 vid = 0;
1da177e4	40
fd65e5a9 NA	41	memset(skb->cb, 0, sizeof(struct br_input_skb_cb));
fd65e5a9 NA	42
c03307ea	43	rcu_read_lock();
1a4ba64d PNA	44	nf_ops = rcu_dereference(nf_br_ops);
1a4ba64d PNA	45	if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
c03307ea	46	rcu_read_unlock();
ea2d9b41 BDS	47	return NETDEV_TX_OK;
ea2d9b41 BDS	48	}
ea2d9b41	49
7609ecb2	50	dev_sw_netstats_tx_add(dev, 1, skb->len);
6088a539	51
f1c2eddf	52	br_switchdev_frame_unmark(skb);
14bb4789	53	BR_INPUT_SKB_CB(skb)->brdev = dev;
3c171f49	54	BR_INPUT_SKB_CB(skb)->frag_max_size = 0;
1da177e4	55
459a98ed	56	skb_reset_mac_header(skb);
1da177e4 LT	57	skb_pull(skb, ETH_HLEN);
1da177e4 LT	58
f4b7002a NA	59	if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid,
f4b7002a NA	60	&state, &vlan))
12464bb8 TM	61	goto out;
12464bb8 TM	62
057658cb	63	if (IS_ENABLED(CONFIG_INET) &&
823d81b0 NA	64	(eth_hdr(skb)->h_proto == htons(ETH_P_ARP) \|\|
823d81b0 NA	65	eth_hdr(skb)->h_proto == htons(ETH_P_RARP)) &&
c69c2cd4	66	br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
057658cb	67	br_do_proxy_suppress_arp(skb, br, vid, NULL);
ed842fae RP	68	} else if (IS_ENABLED(CONFIG_IPV6) &&
ed842fae RP	69	skb->protocol == htons(ETH_P_IPV6) &&
c69c2cd4	70	br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
ed842fae RP	71	pskb_may_pull(skb, sizeof(struct ipv6hdr) +
	72	sizeof(struct nd_msg)) &&
	73	ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
	74	struct nd_msg *msg, _msg;
	75
	76	msg = br_is_nd_neigh_msg(skb, &_msg);
	77	if (msg)
	78	br_do_suppress_nd(skb, br, vid, NULL, msg);
057658cb RP	79	}
057658cb RP	80
31a4562d	81	dest = eth_hdr(skb)->h_dest;
37b090e6	82	if (is_broadcast_ether_addr(dest)) {
e408336a	83	br_flood(br, skb, BR_PKT_BROADCAST, false, true, vid);
37b090e6	84	} else if (is_multicast_ether_addr(dest)) {
91d2c34a	85	if (unlikely(netpoll_tx_running(dev))) {
e408336a	86	br_flood(br, skb, BR_PKT_MULTICAST, false, true, vid);
91d2c34a HX	87	goto out;
91d2c34a HX	88	}
f4b7002a	89	if (br_multicast_rcv(&brmctx, &pmctx_null, vlan, skb, vid)) {
6d1d1d39	90	kfree_skb(skb);
c4fcb78c	91	goto out;
6d1d1d39	92	}
c4fcb78c	93
adc47037	94	mdst = br_mdb_get(brmctx, skb, vid);
b00589af	95	if ((mdst \|\| BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
adc47037 NA	96	br_multicast_querier_exists(brmctx, eth_hdr(skb), mdst))
adc47037 NA	97	br_multicast_flood(mdst, skb, brmctx, false, true);
c4fcb78c	98	else
e408336a	99	br_flood(br, skb, BR_PKT_MULTICAST, false, true, vid);
bfd0aeac	100	} else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
37b090e6 NA	101	br_forward(dst->dst, skb, false, true);
37b090e6 NA	102	} else {
e408336a	103	br_flood(br, skb, BR_PKT_UNICAST, false, true, vid);
37b090e6	104	}
c4fcb78c	105	out:
eeaf61d8	106	rcu_read_unlock();
6ed10654	107	return NETDEV_TX_OK;
1da177e4 LT	108	}
1da177e4 LT	109
845e0ebb CW	110	static struct lock_class_key bridge_netdev_addr_lock_key;
	111
	112	static void br_set_lockdep_class(struct net_device *dev)
	113	{
	114	lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
	115	}
	116
bb900b27	117	static int br_dev_init(struct net_device *dev)
	118	{
	119	struct net_bridge *br = netdev_priv(dev);
5be5a2df	120	int err;
bb900b27	121
7609ecb2 HK	122	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
7609ecb2 HK	123	if (!dev->tstats)
bb900b27	124	return -ENOMEM;
bb900b27	125
eb793583 NA	126	err = br_fdb_hash_init(br);
eb793583 NA	127	if (err) {
7609ecb2	128	free_percpu(dev->tstats);
eb793583 NA	129	return err;
	130	}
	131
19e3a9c9 NA	132	err = br_mdb_hash_init(br);
19e3a9c9 NA	133	if (err) {
7609ecb2	134	free_percpu(dev->tstats);
19e3a9c9 NA	135	br_fdb_hash_fini(br);
	136	return err;
	137	}
	138
5be5a2df	139	err = br_vlan_init(br);
1080ab95	140	if (err) {
7609ecb2	141	free_percpu(dev->tstats);
19e3a9c9	142	br_mdb_hash_fini(br);
eb793583	143	br_fdb_hash_fini(br);
1080ab95 NA	144	return err;
	145	}
	146
	147	err = br_multicast_init_stats(br);
	148	if (err) {
7609ecb2	149	free_percpu(dev->tstats);
1080ab95	150	br_vlan_flush(br);
19e3a9c9	151	br_mdb_hash_fini(br);
eb793583	152	br_fdb_hash_fini(br);
1080ab95	153	}
5be5a2df	154
845e0ebb	155	br_set_lockdep_class(dev);
5be5a2df	156	return err;
bb900b27	157	}
bb900b27	158
b6fe0440 IS	159	static void br_dev_uninit(struct net_device *dev)
	160	{
	161	struct net_bridge *br = netdev_priv(dev);
	162
b1b9d366	163	br_multicast_dev_del(br);
b6fe0440 IS	164	br_multicast_uninit_stats(br);
b6fe0440 IS	165	br_vlan_flush(br);
19e3a9c9	166	br_mdb_hash_fini(br);
eb793583	167	br_fdb_hash_fini(br);
7609ecb2	168	free_percpu(dev->tstats);
b6fe0440 IS	169	}
b6fe0440 IS	170
1da177e4 LT	171	static int br_dev_open(struct net_device *dev)
1da177e4 LT	172	{
81d35307	173	struct net_bridge *br = netdev_priv(dev);
1da177e4	174
c4d27ef9	175	netdev_update_features(dev);
81d35307 SH	176	netif_start_queue(dev);
81d35307 SH	177	br_stp_enable_bridge(br);
3fe2d7c7	178	br_multicast_open(br);
1da177e4	179
851d0a73 JH	180	if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
	181	br_multicast_join_snoopers(br);
	182
1da177e4 LT	183	return 0;
	184	}
	185
	186	static void br_dev_set_multicast_list(struct net_device *dev)
	187	{
	188	}
	189
2796d0c6 VY	190	static void br_dev_change_rx_flags(struct net_device *dev, int change)
	191	{
	192	if (change & IFF_PROMISC)
	193	br_manage_promisc(netdev_priv(dev));
	194	}
	195
1da177e4 LT	196	static int br_dev_stop(struct net_device *dev)
1da177e4 LT	197	{
3fe2d7c7 HX	198	struct net_bridge *br = netdev_priv(dev);
	199
	200	br_stp_disable_bridge(br);
	201	br_multicast_stop(br);
1da177e4	202
851d0a73 JH	203	if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
	204	br_multicast_leave_snoopers(br);
	205
1da177e4 LT	206	netif_stop_queue(dev);
	207
	208	return 0;
	209	}
	210
	211	static int br_change_mtu(struct net_device *dev, int new_mtu)
	212	{
4adf0af6	213	struct net_bridge *br = netdev_priv(dev);
f40aa233	214
1da177e4	215	dev->mtu = new_mtu;
4adf0af6	216
804b854d	217	/* this flag will be cleared if the MTU was automatically adjusted */
3341d917	218	br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
34666d46	219	#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
4adf0af6	220	/* remember the MTU in the rtable for PMTU */
defb3519	221	dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
4adf0af6 SW	222	#endif
4adf0af6 SW	223
1da177e4 LT	224	return 0;
	225	}
	226
ffe1d49c	227	/* Allow setting mac address to any valid ethernet address. */
4505a3ef SH	228	static int br_set_mac_address(struct net_device dev, void p)
	229	{
	230	struct net_bridge *br = netdev_priv(dev);
	231	struct sockaddr *addr = p;
ffe1d49c SH	232
ffe1d49c SH	233	if (!is_valid_ether_addr(addr->sa_data))
7ca1e11a	234	return -EADDRNOTAVAIL;
4505a3ef	235
c4b4c421 NA	236	/* dev_set_mac_addr() can be called by a master device on bridge's
	237	* NETDEV_UNREGISTER, but since it's being destroyed do nothing
	238	*/
	239	if (dev->reg_state != NETREG_REGISTERED)
	240	return -EBUSY;
	241
4505a3ef	242	spin_lock_bh(&br->lock);
9a7b6ef9	243	if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
a3ebb7ef	244	/* Mac address will be changed in br_stp_change_bridge_id(). */
43598813	245	br_stp_change_bridge_id(br, addr->sa_data);
43598813	246	}
4505a3ef SH	247	spin_unlock_bh(&br->lock);
4505a3ef SH	248
ffe1d49c	249	return 0;
4505a3ef SH	250	}
4505a3ef SH	251
edb5e46f SH	252	static void br_getinfo(struct net_device dev, struct ethtool_drvinfo info)
edb5e46f SH	253	{
993e1634 WS	254	strscpy(info->driver, "bridge", sizeof(info->driver));
	255	strscpy(info->version, BR_VERSION, sizeof(info->version));
	256	strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
	257	strscpy(info->bus_info, "N/A", sizeof(info->bus_info));
edb5e46f SH	258	}
edb5e46f SH	259
542575fe MS	260	static int br_get_link_ksettings(struct net_device *dev,
	261	struct ethtool_link_ksettings *cmd)
	262	{
	263	struct net_bridge *br = netdev_priv(dev);
	264	struct net_bridge_port *p;
	265
	266	cmd->base.duplex = DUPLEX_UNKNOWN;
	267	cmd->base.port = PORT_OTHER;
	268	cmd->base.speed = SPEED_UNKNOWN;
	269
	270	list_for_each_entry(p, &br->port_list, list) {
	271	struct ethtool_link_ksettings ecmd;
	272	struct net_device *pdev = p->dev;
	273
	274	if (!netif_running(pdev) \|\| !netif_oper_up(pdev))
	275	continue;
	276
	277	if (__ethtool_get_link_ksettings(pdev, &ecmd))
	278	continue;
	279
	280	if (ecmd.base.speed == (__u32)SPEED_UNKNOWN)
	281	continue;
	282
	283	if (cmd->base.speed == (__u32)SPEED_UNKNOWN \|\|
	284	cmd->base.speed < ecmd.base.speed)
	285	cmd->base.speed = ecmd.base.speed;
	286	}
	287
	288	return 0;
	289	}
	290
c8f44aff MM	291	static netdev_features_t br_fix_features(struct net_device *dev,
c8f44aff MM	292	netdev_features_t features)
edb5e46f SH	293	{
	294	struct net_bridge *br = netdev_priv(dev);
	295
c4d27ef9	296	return br_features_recompute(br, features);
361ff8a6 JG	297	}
361ff8a6 JG	298
c06ee961	299	#ifdef CONFIG_NET_POLL_CONTROLLER
91d2c34a	300	static void br_poll_controller(struct net_device *br_dev)
c06ee961	301	{
c06ee961 WC	302	}
c06ee961 WC	303
91d2c34a	304	static void br_netpoll_cleanup(struct net_device *dev)
c06ee961	305	{
91d2c34a	306	struct net_bridge *br = netdev_priv(dev);
4e3828c4	307	struct net_bridge_port *p;
c06ee961	308
4e3828c4	309	list_for_each_entry(p, &br->port_list, list)
91d2c34a	310	br_netpoll_disable(p);
c06ee961 WC	311	}
c06ee961 WC	312
a8779ec1	313	static int __br_netpoll_enable(struct net_bridge_port *p)
dbe17307 CW	314	{
	315	struct netpoll *np;
	316	int err;
	317
a8779ec1	318	np = kzalloc(sizeof(*p->np), GFP_KERNEL);
dbe17307 CW	319	if (!np)
	320	return -ENOMEM;
	321
a8779ec1	322	err = __netpoll_setup(np, p->dev);
dbe17307 CW	323	if (err) {
	324	kfree(np);
	325	return err;
	326	}
	327
	328	p->np = np;
	329	return err;
	330	}
	331
a8779ec1	332	int br_netpoll_enable(struct net_bridge_port *p)
dbe17307 CW	333	{
	334	if (!p->br->dev->npinfo)
	335	return 0;
	336
a8779ec1	337	return __br_netpoll_enable(p);
dbe17307 CW	338	}
dbe17307 CW	339
a8779ec1	340	static int br_netpoll_setup(struct net_device dev, struct netpoll_info ni)
c06ee961	341	{
cfb478da	342	struct net_bridge *br = netdev_priv(dev);
4e3828c4	343	struct net_bridge_port *p;
91d2c34a	344	int err = 0;
c06ee961	345
4e3828c4	346	list_for_each_entry(p, &br->port_list, list) {
91d2c34a HX	347	if (!p->dev)
91d2c34a HX	348	continue;
a8779ec1	349	err = __br_netpoll_enable(p);
91d2c34a HX	350	if (err)
91d2c34a HX	351	goto fail;
c06ee961	352	}
91d2c34a HX	353
	354	out:
	355	return err;
	356
	357	fail:
	358	br_netpoll_cleanup(dev);
	359	goto out;
c06ee961 WC	360	}
c06ee961 WC	361
91d2c34a	362	void br_netpoll_disable(struct net_bridge_port *p)
c06ee961	363	{
91d2c34a HX	364	struct netpoll *np = p->np;
	365
	366	if (!np)
	367	return;
	368
	369	p->np = NULL;
	370
c9fbd71f	371	__netpoll_free(np);
c06ee961 WC	372	}
	373
	374	#endif
	375
33eaf2a6 DA	376	static int br_add_slave(struct net_device dev, struct net_device slave_dev,
33eaf2a6 DA	377	struct netlink_ext_ack *extack)
afc6151a JP	378
	379	{
	380	struct net_bridge *br = netdev_priv(dev);
	381
ca752be0	382	return br_add_if(br, slave_dev, extack);
afc6151a JP	383	}
	384
	385	static int br_del_slave(struct net_device dev, struct net_device slave_dev)
	386	{
	387	struct net_bridge *br = netdev_priv(dev);
	388
	389	return br_del_if(br, slave_dev);
	390	}
	391
ec9d16ba PNA	392	static int br_fill_forward_path(struct net_device_path_ctx *ctx,
	393	struct net_device_path *path)
	394	{
	395	struct net_bridge_fdb_entry *f;
	396	struct net_bridge_port *dst;
	397	struct net_bridge *br;
	398
	399	if (netif_is_bridge_port(ctx->dev))
	400	return -1;
	401
	402	br = netdev_priv(ctx->dev);
bcf2766b FF	403
	404	br_vlan_fill_forward_path_pvid(br, ctx, path);
	405
	406	f = br_fdb_find_rcu(br, ctx->daddr, path->bridge.vlan_id);
ec9d16ba PNA	407	if (!f \|\| !f->dst)
	408	return -1;
	409
	410	dst = READ_ONCE(f->dst);
	411	if (!dst)
	412	return -1;
	413
bcf2766b FF	414	if (br_vlan_fill_forward_path_mode(br, dst, path))
	415	return -1;
	416
ec9d16ba PNA	417	path->type = DEV_PATH_BRIDGE;
	418	path->dev = dst->br->dev;
	419	ctx->dev = dst->dev;
	420
bcf2766b FF	421	switch (path->bridge.vlan_mode) {
	422	case DEV_PATH_BR_VLAN_TAG:
	423	if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
	424	return -ENOSPC;
	425	ctx->vlan[ctx->num_vlans].id = path->bridge.vlan_id;
	426	ctx->vlan[ctx->num_vlans].proto = path->bridge.vlan_proto;
	427	ctx->num_vlans++;
	428	break;
26267bf9	429	case DEV_PATH_BR_VLAN_UNTAG_HW:
bcf2766b FF	430	case DEV_PATH_BR_VLAN_UNTAG:
	431	ctx->num_vlans--;
	432	break;
	433	case DEV_PATH_BR_VLAN_KEEP:
	434	break;
	435	}
	436
ec9d16ba PNA	437	return 0;
	438	}
	439
a2dbb882	440	static const struct ethtool_ops br_ethtool_ops = {
542575fe MS	441	.get_drvinfo = br_getinfo,
	442	.get_link = ethtool_op_get_link,
	443	.get_link_ksettings = br_get_link_ksettings,
edb5e46f SH	444	};
edb5e46f SH	445
a2dbb882 SH	446	static const struct net_device_ops br_netdev_ops = {
	447	.ndo_open = br_dev_open,
	448	.ndo_stop = br_dev_stop,
bb900b27	449	.ndo_init = br_dev_init,
b6fe0440	450	.ndo_uninit = br_dev_uninit,
00829823	451	.ndo_start_xmit = br_dev_xmit,
7609ecb2	452	.ndo_get_stats64 = dev_get_tstats64,
00829823	453	.ndo_set_mac_address = br_set_mac_address,
afc4b13d	454	.ndo_set_rx_mode = br_dev_set_multicast_list,
2796d0c6	455	.ndo_change_rx_flags = br_dev_change_rx_flags,
00829823	456	.ndo_change_mtu = br_change_mtu,
561d8352	457	.ndo_siocdevprivate = br_dev_siocdevprivate,
c06ee961	458	#ifdef CONFIG_NET_POLL_CONTROLLER
91d2c34a	459	.ndo_netpoll_setup = br_netpoll_setup,
c06ee961 WC	460	.ndo_netpoll_cleanup = br_netpoll_cleanup,
	461	.ndo_poll_controller = br_poll_controller,
	462	#endif
afc6151a JP	463	.ndo_add_slave = br_add_slave,
afc6151a JP	464	.ndo_del_slave = br_del_slave,
c4d27ef9	465	.ndo_fix_features = br_fix_features,
77162022 JF	466	.ndo_fdb_add = br_fdb_add,
77162022 JF	467	.ndo_fdb_del = br_fdb_delete,
edaef191	468	.ndo_fdb_del_bulk = br_fdb_delete_bulk,
77162022	469	.ndo_fdb_dump = br_fdb_dump,
47674562	470	.ndo_fdb_get = br_fdb_get,
cc7f5022 IS	471	.ndo_mdb_add = br_mdb_add,
	472	.ndo_mdb_del = br_mdb_del,
	473	.ndo_mdb_dump = br_mdb_dump,
e5a55a89 JF	474	.ndo_bridge_getlink = br_getlink,
e5a55a89 JF	475	.ndo_bridge_setlink = br_setlink,
407af329	476	.ndo_bridge_dellink = br_dellink,
66780530	477	.ndo_features_check = passthru_features_check,
ec9d16ba	478	.ndo_fill_forward_path = br_fill_forward_path,
a2dbb882 SH	479	};
a2dbb882 SH	480
bb900b27	481	static struct device_type br_type = {
	482	.name = "bridge",
	483	};
	484
1da177e4 LT	485	void br_dev_setup(struct net_device *dev)
1da177e4 LT	486	{
bb900b27	487	struct net_bridge *br = netdev_priv(dev);
bb900b27	488
7ce5d222	489	eth_hw_addr_random(dev);
1da177e4 LT	490	ether_setup(dev);
1da177e4 LT	491
a2dbb882	492	dev->netdev_ops = &br_netdev_ops;
cf124db5	493	dev->needs_free_netdev = true;
7ad24ea4	494	dev->ethtool_ops = &br_ethtool_ops;
bb900b27	495	SET_NETDEV_DEVTYPE(dev, &br_type);
ccecb2a4	496	dev->priv_flags = IFF_EBRIDGE \| IFF_NO_QUEUE;
edb5e46f	497
161f65ba	498	dev->features = COMMON_FEATURES \| NETIF_F_LLTX \| NETIF_F_NETNS_LOCAL \|
1c5abb6c TM	499	NETIF_F_HW_VLAN_CTAG_TX \| NETIF_F_HW_VLAN_STAG_TX;
	500	dev->hw_features = COMMON_FEATURES \| NETIF_F_HW_VLAN_CTAG_TX \|
	501	NETIF_F_HW_VLAN_STAG_TX;
161f65ba	502	dev->vlan_features = COMMON_FEATURES;
bb900b27	503
	504	br->dev = dev;
	505	spin_lock_init(&br->lock);
	506	INIT_LIST_HEAD(&br->port_list);
eb793583	507	INIT_HLIST_HEAD(&br->fdb_list);
90c628dd	508	INIT_HLIST_HEAD(&br->frame_type_list);
65369933	509	#if IS_ENABLED(CONFIG_BRIDGE_MRP)
0169b820	510	INIT_HLIST_HEAD(&br->mrp_list);
f323aa54 HB	511	#endif
	512	#if IS_ENABLED(CONFIG_BRIDGE_CFM)
	513	INIT_HLIST_HEAD(&br->mep_list);
65369933	514	#endif
bb900b27	515	spin_lock_init(&br->hash_lock);
	516
	517	br->bridge_id.prio[0] = 0x80;
	518	br->bridge_id.prio[1] = 0x00;
	519
05428729	520	ether_addr_copy(br->group_addr, eth_stp_addr);
bb900b27	521
bb900b27	522	br->stp_enabled = BR_NO_STP;
515853cc	523	br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
f2808d22	524	br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
515853cc	525
bb900b27	526	br->designated_root = br->bridge_id;
	527	br->bridge_max_age = br->max_age = 20 * HZ;
	528	br->bridge_hello_time = br->hello_time = 2 * HZ;
	529	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
34d8acd8	530	br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
91572088	531	dev->max_mtu = ETH_MAX_MTU;
bb900b27	532
	533	br_netfilter_rtable_init(br);
	534	br_stp_timer_init(br);
	535	br_multicast_init(br);
f7cdee8a	536	INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
1da177e4	537	}