[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 <net/netdev_lock.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)
{
	enum skb_drop_reason reason = pskb_may_pull_reason(skb, ETH_HLEN);
	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;

	if (unlikely(reason != SKB_NOT_DROPPED_YET)) {
		kfree_skb_reason(skb, reason);
		return NETDEV_TX_OK;
	}

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

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

	err = br_fdb_hash_init(br);
	if (err)
		return err;

	err = br_mdb_hash_init(br);
	if (err) {
		br_fdb_hash_fini(br);
		return err;
	}

	err = br_vlan_init(br);
	if (err) {
		br_mdb_hash_fini(br);
		br_fdb_hash_fini(br);
		return err;
	}

	err = br_multicast_init_stats(br);
	if (err) {
		br_vlan_flush(br);
		br_mdb_hash_fini(br);
		br_fdb_hash_fini(br);
		return err;
	}

	netdev_lockdep_set_classes(dev);
	return 0;
}

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);
}

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);

	WRITE_ONCE(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 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)
		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_del_bulk	 = br_mdb_del_bulk,
	.ndo_mdb_dump		 = br_mdb_dump,
	.ndo_mdb_get		 = br_mdb_get,
	.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 const 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->lltx = true;
	dev->netns_immutable = true;

	dev->features = COMMON_FEATURES | 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;
	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;

	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
	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/*
	3	* Device handling code
	4	* Linux ethernet bridge
	5	*
	6	* Authors:
	7	* Lennert Buytenhek <buytenh@gnu.org>
	8	*/
	9
	10	#include <linux/kernel.h>
	11	#include <linux/netdevice.h>
	12	#include <linux/netpoll.h>
	13	#include <linux/etherdevice.h>
	14	#include <linux/ethtool.h>
	15	#include <linux/list.h>
	16	#include <linux/netfilter_bridge.h>
	17
	18	#include <linux/uaccess.h>
	19	#include <net/netdev_lock.h>
	20
	21	#include "br_private.h"
	22
	23	#define COMMON_FEATURES (NETIF_F_SG \| NETIF_F_FRAGLIST \| NETIF_F_HIGHDMA \| \
	24	NETIF_F_GSO_MASK \| NETIF_F_HW_CSUM)
	25
	26	const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
	27	EXPORT_SYMBOL_GPL(nf_br_ops);
	28
	29	/* net device transmit always called with BH disabled */
	30	netdev_tx_t br_dev_xmit(struct sk_buff skb, struct net_device dev)
	31	{
	32	enum skb_drop_reason reason = pskb_may_pull_reason(skb, ETH_HLEN);
	33	struct net_bridge_mcast_port *pmctx_null = NULL;
	34	struct net_bridge *br = netdev_priv(dev);
	35	struct net_bridge_mcast *brmctx = &br->multicast_ctx;
	36	struct net_bridge_fdb_entry *dst;
	37	struct net_bridge_mdb_entry *mdst;
	38	const struct nf_br_ops *nf_ops;
	39	u8 state = BR_STATE_FORWARDING;
	40	struct net_bridge_vlan *vlan;
	41	const unsigned char *dest;
	42	u16 vid = 0;
	43
	44	if (unlikely(reason != SKB_NOT_DROPPED_YET)) {
	45	kfree_skb_reason(skb, reason);
	46	return NETDEV_TX_OK;
	47	}
	48
	49	memset(skb->cb, 0, sizeof(struct br_input_skb_cb));
	50	br_tc_skb_miss_set(skb, false);
	51
	52	rcu_read_lock();
	53	nf_ops = rcu_dereference(nf_br_ops);
	54	if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
	55	rcu_read_unlock();
	56	return NETDEV_TX_OK;
	57	}
	58
	59	dev_sw_netstats_tx_add(dev, 1, skb->len);
	60
	61	br_switchdev_frame_unmark(skb);
	62	BR_INPUT_SKB_CB(skb)->brdev = dev;
	63	BR_INPUT_SKB_CB(skb)->frag_max_size = 0;
	64
	65	skb_reset_mac_header(skb);
	66	skb_pull(skb, ETH_HLEN);
	67
	68	if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid,
	69	&state, &vlan))
	70	goto out;
	71
	72	if (IS_ENABLED(CONFIG_INET) &&
	73	(eth_hdr(skb)->h_proto == htons(ETH_P_ARP) \|\|
	74	eth_hdr(skb)->h_proto == htons(ETH_P_RARP)) &&
	75	br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
	76	br_do_proxy_suppress_arp(skb, br, vid, NULL);
	77	} else if (IS_ENABLED(CONFIG_IPV6) &&
	78	skb->protocol == htons(ETH_P_IPV6) &&
	79	br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
	80	pskb_may_pull(skb, sizeof(struct ipv6hdr) +
	81	sizeof(struct nd_msg)) &&
	82	ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
	83	struct nd_msg *msg, _msg;
	84
	85	msg = br_is_nd_neigh_msg(skb, &_msg);
	86	if (msg)
	87	br_do_suppress_nd(skb, br, vid, NULL, msg);
	88	}
	89
	90	dest = eth_hdr(skb)->h_dest;
	91	if (is_broadcast_ether_addr(dest)) {
	92	br_flood(br, skb, BR_PKT_BROADCAST, false, true, vid);
	93	} else if (is_multicast_ether_addr(dest)) {
	94	if (unlikely(netpoll_tx_running(dev))) {
	95	br_flood(br, skb, BR_PKT_MULTICAST, false, true, vid);
	96	goto out;
	97	}
	98	if (br_multicast_rcv(&brmctx, &pmctx_null, vlan, skb, vid)) {
	99	kfree_skb(skb);
	100	goto out;
	101	}
	102
	103	mdst = br_mdb_entry_skb_get(brmctx, skb, vid);
	104	if ((mdst \|\| BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
	105	br_multicast_querier_exists(brmctx, eth_hdr(skb), mdst))
	106	br_multicast_flood(mdst, skb, brmctx, false, true);
	107	else
	108	br_flood(br, skb, BR_PKT_MULTICAST, false, true, vid);
	109	} else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
	110	br_forward(dst->dst, skb, false, true);
	111	} else {
	112	br_flood(br, skb, BR_PKT_UNICAST, false, true, vid);
	113	}
	114	out:
	115	rcu_read_unlock();
	116	return NETDEV_TX_OK;
	117	}
	118
	119	static int br_dev_init(struct net_device *dev)
	120	{
	121	struct net_bridge *br = netdev_priv(dev);
	122	int err;
	123
	124	err = br_fdb_hash_init(br);
	125	if (err)
	126	return err;
	127
	128	err = br_mdb_hash_init(br);
	129	if (err) {
	130	br_fdb_hash_fini(br);
	131	return err;
	132	}
	133
	134	err = br_vlan_init(br);
	135	if (err) {
	136	br_mdb_hash_fini(br);
	137	br_fdb_hash_fini(br);
	138	return err;
	139	}
	140
	141	err = br_multicast_init_stats(br);
	142	if (err) {
	143	br_vlan_flush(br);
	144	br_mdb_hash_fini(br);
	145	br_fdb_hash_fini(br);
	146	return err;
	147	}
	148
	149	netdev_lockdep_set_classes(dev);
	150	return 0;
	151	}
	152
	153	static void br_dev_uninit(struct net_device *dev)
	154	{
	155	struct net_bridge *br = netdev_priv(dev);
	156
	157	br_multicast_dev_del(br);
	158	br_multicast_uninit_stats(br);
	159	br_vlan_flush(br);
	160	br_mdb_hash_fini(br);
	161	br_fdb_hash_fini(br);
	162	}
	163
	164	static int br_dev_open(struct net_device *dev)
	165	{
	166	struct net_bridge *br = netdev_priv(dev);
	167
	168	netdev_update_features(dev);
	169	netif_start_queue(dev);
	170	br_stp_enable_bridge(br);
	171	br_multicast_open(br);
	172
	173	if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
	174	br_multicast_join_snoopers(br);
	175
	176	return 0;
	177	}
	178
	179	static void br_dev_set_multicast_list(struct net_device *dev)
	180	{
	181	}
	182
	183	static void br_dev_change_rx_flags(struct net_device *dev, int change)
	184	{
	185	if (change & IFF_PROMISC)
	186	br_manage_promisc(netdev_priv(dev));
	187	}
	188
	189	static int br_dev_stop(struct net_device *dev)
	190	{
	191	struct net_bridge *br = netdev_priv(dev);
	192
	193	br_stp_disable_bridge(br);
	194	br_multicast_stop(br);
	195
	196	if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
	197	br_multicast_leave_snoopers(br);
	198
	199	netif_stop_queue(dev);
	200
	201	return 0;
	202	}
	203
	204	static int br_change_mtu(struct net_device *dev, int new_mtu)
	205	{
	206	struct net_bridge *br = netdev_priv(dev);
	207
	208	WRITE_ONCE(dev->mtu, new_mtu);
	209
	210	/* this flag will be cleared if the MTU was automatically adjusted */
	211	br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
	212	#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
	213	/* remember the MTU in the rtable for PMTU */
	214	dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
	215	#endif
	216
	217	return 0;
	218	}
	219
	220	/* Allow setting mac address to any valid ethernet address. */
	221	static int br_set_mac_address(struct net_device dev, void p)
	222	{
	223	struct net_bridge *br = netdev_priv(dev);
	224	struct sockaddr *addr = p;
	225
	226	if (!is_valid_ether_addr(addr->sa_data))
	227	return -EADDRNOTAVAIL;
	228
	229	/* dev_set_mac_addr() can be called by a master device on bridge's
	230	* NETDEV_UNREGISTER, but since it's being destroyed do nothing
	231	*/
	232	if (dev->reg_state != NETREG_REGISTERED)
	233	return -EBUSY;
	234
	235	spin_lock_bh(&br->lock);
	236	if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
	237	/* Mac address will be changed in br_stp_change_bridge_id(). */
	238	br_stp_change_bridge_id(br, addr->sa_data);
	239	}
	240	spin_unlock_bh(&br->lock);
	241
	242	return 0;
	243	}
	244
	245	static void br_getinfo(struct net_device dev, struct ethtool_drvinfo info)
	246	{
	247	strscpy(info->driver, "bridge", sizeof(info->driver));
	248	strscpy(info->version, BR_VERSION, sizeof(info->version));
	249	strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
	250	strscpy(info->bus_info, "N/A", sizeof(info->bus_info));
	251	}
	252
	253	static int br_get_link_ksettings(struct net_device *dev,
	254	struct ethtool_link_ksettings *cmd)
	255	{
	256	struct net_bridge *br = netdev_priv(dev);
	257	struct net_bridge_port *p;
	258
	259	cmd->base.duplex = DUPLEX_UNKNOWN;
	260	cmd->base.port = PORT_OTHER;
	261	cmd->base.speed = SPEED_UNKNOWN;
	262
	263	list_for_each_entry(p, &br->port_list, list) {
	264	struct ethtool_link_ksettings ecmd;
	265	struct net_device *pdev = p->dev;
	266
	267	if (!netif_running(pdev) \|\| !netif_oper_up(pdev))
	268	continue;
	269
	270	if (__ethtool_get_link_ksettings(pdev, &ecmd))
	271	continue;
	272
	273	if (ecmd.base.speed == (__u32)SPEED_UNKNOWN)
	274	continue;
	275
	276	if (cmd->base.speed == (__u32)SPEED_UNKNOWN \|\|
	277	cmd->base.speed < ecmd.base.speed)
	278	cmd->base.speed = ecmd.base.speed;
	279	}
	280
	281	return 0;
	282	}
	283
	284	static netdev_features_t br_fix_features(struct net_device *dev,
	285	netdev_features_t features)
	286	{
	287	struct net_bridge *br = netdev_priv(dev);
	288
	289	return br_features_recompute(br, features);
	290	}
	291
	292	#ifdef CONFIG_NET_POLL_CONTROLLER
	293	static void br_poll_controller(struct net_device *br_dev)
	294	{
	295	}
	296
	297	static void br_netpoll_cleanup(struct net_device *dev)
	298	{
	299	struct net_bridge *br = netdev_priv(dev);
	300	struct net_bridge_port *p;
	301
	302	list_for_each_entry(p, &br->port_list, list)
	303	br_netpoll_disable(p);
	304	}
	305
	306	static int __br_netpoll_enable(struct net_bridge_port *p)
	307	{
	308	struct netpoll *np;
	309	int err;
	310
	311	np = kzalloc(sizeof(*p->np), GFP_KERNEL);
	312	if (!np)
	313	return -ENOMEM;
	314
	315	err = __netpoll_setup(np, p->dev);
	316	if (err) {
	317	kfree(np);
	318	return err;
	319	}
	320
	321	p->np = np;
	322	return err;
	323	}
	324
	325	int br_netpoll_enable(struct net_bridge_port *p)
	326	{
	327	if (!p->br->dev->npinfo)
	328	return 0;
	329
	330	return __br_netpoll_enable(p);
	331	}
	332
	333	static int br_netpoll_setup(struct net_device *dev)
	334	{
	335	struct net_bridge *br = netdev_priv(dev);
	336	struct net_bridge_port *p;
	337	int err = 0;
	338
	339	list_for_each_entry(p, &br->port_list, list) {
	340	if (!p->dev)
	341	continue;
	342	err = __br_netpoll_enable(p);
	343	if (err)
	344	goto fail;
	345	}
	346
	347	out:
	348	return err;
	349
	350	fail:
	351	br_netpoll_cleanup(dev);
	352	goto out;
	353	}
	354
	355	void br_netpoll_disable(struct net_bridge_port *p)
	356	{
	357	struct netpoll *np = p->np;
	358
	359	if (!np)
	360	return;
	361
	362	p->np = NULL;
	363
	364	__netpoll_free(np);
	365	}
	366
	367	#endif
	368
	369	static int br_add_slave(struct net_device dev, struct net_device slave_dev,
	370	struct netlink_ext_ack *extack)
	371
	372	{
	373	struct net_bridge *br = netdev_priv(dev);
	374
	375	return br_add_if(br, slave_dev, extack);
	376	}
	377
	378	static int br_del_slave(struct net_device dev, struct net_device slave_dev)
	379	{
	380	struct net_bridge *br = netdev_priv(dev);
	381
	382	return br_del_if(br, slave_dev);
	383	}
	384
	385	static int br_fill_forward_path(struct net_device_path_ctx *ctx,
	386	struct net_device_path *path)
	387	{
	388	struct net_bridge_fdb_entry *f;
	389	struct net_bridge_port *dst;
	390	struct net_bridge *br;
	391
	392	if (netif_is_bridge_port(ctx->dev))
	393	return -1;
	394
	395	br = netdev_priv(ctx->dev);
	396
	397	br_vlan_fill_forward_path_pvid(br, ctx, path);
	398
	399	f = br_fdb_find_rcu(br, ctx->daddr, path->bridge.vlan_id);
	400	if (!f)
	401	return -1;
	402
	403	dst = READ_ONCE(f->dst);
	404	if (!dst)
	405	return -1;
	406
	407	if (br_vlan_fill_forward_path_mode(br, dst, path))
	408	return -1;
	409
	410	path->type = DEV_PATH_BRIDGE;
	411	path->dev = dst->br->dev;
	412	ctx->dev = dst->dev;
	413
	414	switch (path->bridge.vlan_mode) {
	415	case DEV_PATH_BR_VLAN_TAG:
	416	if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
	417	return -ENOSPC;
	418	ctx->vlan[ctx->num_vlans].id = path->bridge.vlan_id;
	419	ctx->vlan[ctx->num_vlans].proto = path->bridge.vlan_proto;
	420	ctx->num_vlans++;
	421	break;
	422	case DEV_PATH_BR_VLAN_UNTAG_HW:
	423	case DEV_PATH_BR_VLAN_UNTAG:
	424	ctx->num_vlans--;
	425	break;
	426	case DEV_PATH_BR_VLAN_KEEP:
	427	break;
	428	}
	429
	430	return 0;
	431	}
	432
	433	static const struct ethtool_ops br_ethtool_ops = {
	434	.get_drvinfo = br_getinfo,
	435	.get_link = ethtool_op_get_link,
	436	.get_link_ksettings = br_get_link_ksettings,
	437	};
	438
	439	static const struct net_device_ops br_netdev_ops = {
	440	.ndo_open = br_dev_open,
	441	.ndo_stop = br_dev_stop,
	442	.ndo_init = br_dev_init,
	443	.ndo_uninit = br_dev_uninit,
	444	.ndo_start_xmit = br_dev_xmit,
	445	.ndo_get_stats64 = dev_get_tstats64,
	446	.ndo_set_mac_address = br_set_mac_address,
	447	.ndo_set_rx_mode = br_dev_set_multicast_list,
	448	.ndo_change_rx_flags = br_dev_change_rx_flags,
	449	.ndo_change_mtu = br_change_mtu,
	450	.ndo_siocdevprivate = br_dev_siocdevprivate,
	451	#ifdef CONFIG_NET_POLL_CONTROLLER
	452	.ndo_netpoll_setup = br_netpoll_setup,
	453	.ndo_netpoll_cleanup = br_netpoll_cleanup,
	454	.ndo_poll_controller = br_poll_controller,
	455	#endif
	456	.ndo_add_slave = br_add_slave,
	457	.ndo_del_slave = br_del_slave,
	458	.ndo_fix_features = br_fix_features,
	459	.ndo_fdb_add = br_fdb_add,
	460	.ndo_fdb_del = br_fdb_delete,
	461	.ndo_fdb_del_bulk = br_fdb_delete_bulk,
	462	.ndo_fdb_dump = br_fdb_dump,
	463	.ndo_fdb_get = br_fdb_get,
	464	.ndo_mdb_add = br_mdb_add,
	465	.ndo_mdb_del = br_mdb_del,
	466	.ndo_mdb_del_bulk = br_mdb_del_bulk,
	467	.ndo_mdb_dump = br_mdb_dump,
	468	.ndo_mdb_get = br_mdb_get,
	469	.ndo_bridge_getlink = br_getlink,
	470	.ndo_bridge_setlink = br_setlink,
	471	.ndo_bridge_dellink = br_dellink,
	472	.ndo_features_check = passthru_features_check,
	473	.ndo_fill_forward_path = br_fill_forward_path,
	474	};
	475
	476	static const struct device_type br_type = {
	477	.name = "bridge",
	478	};
	479
	480	void br_dev_setup(struct net_device *dev)
	481	{
	482	struct net_bridge *br = netdev_priv(dev);
	483
	484	eth_hw_addr_random(dev);
	485	ether_setup(dev);
	486
	487	dev->netdev_ops = &br_netdev_ops;
	488	dev->needs_free_netdev = true;
	489	dev->ethtool_ops = &br_ethtool_ops;
	490	SET_NETDEV_DEVTYPE(dev, &br_type);
	491	dev->priv_flags = IFF_EBRIDGE \| IFF_NO_QUEUE;
	492	dev->lltx = true;
	493	dev->netns_immutable = true;
	494
	495	dev->features = COMMON_FEATURES \| NETIF_F_HW_VLAN_CTAG_TX \|
	496	NETIF_F_HW_VLAN_STAG_TX;
	497	dev->hw_features = COMMON_FEATURES \| NETIF_F_HW_VLAN_CTAG_TX \|
	498	NETIF_F_HW_VLAN_STAG_TX;
	499	dev->vlan_features = COMMON_FEATURES;
	500	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
	501
	502	br->dev = dev;
	503	spin_lock_init(&br->lock);
	504	INIT_LIST_HEAD(&br->port_list);
	505	INIT_HLIST_HEAD(&br->fdb_list);
	506	INIT_HLIST_HEAD(&br->frame_type_list);
	507	#if IS_ENABLED(CONFIG_BRIDGE_MRP)
	508	INIT_HLIST_HEAD(&br->mrp_list);
	509	#endif
	510	#if IS_ENABLED(CONFIG_BRIDGE_CFM)
	511	INIT_HLIST_HEAD(&br->mep_list);
	512	#endif
	513	spin_lock_init(&br->hash_lock);
	514
	515	br->bridge_id.prio[0] = 0x80;
	516	br->bridge_id.prio[1] = 0x00;
	517
	518	ether_addr_copy(br->group_addr, eth_stp_addr);
	519
	520	br->stp_enabled = BR_NO_STP;
	521	br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
	522	br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
	523
	524	br->designated_root = br->bridge_id;
	525	br->bridge_max_age = br->max_age = 20 * HZ;
	526	br->bridge_hello_time = br->hello_time = 2 * HZ;
	527	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	528	br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
	529	dev->max_mtu = ETH_MAX_MTU;
	530
	531	br_netfilter_rtable_init(br);
	532	br_stp_timer_init(br);
	533	br_multicast_init(br);
	534	INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
	535	}