[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)
{
	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 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)
		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_local = 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
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	{
8bd67ebb	30	enum skb_drop_reason reason = pskb_may_pull_reason(skb, ETH_HLEN);
f4b7002a	31	struct net_bridge_mcast_port *pmctx_null = NULL;
1da177e4	32	struct net_bridge *br = netdev_priv(dev);
adc47037	33	struct net_bridge_mcast *brmctx = &br->multicast_ctx;
1da177e4	34	struct net_bridge_fdb_entry *dst;
c4fcb78c	35	struct net_bridge_mdb_entry *mdst;
1a4ba64d	36	const struct nf_br_ops *nf_ops;
a580c76d	37	u8 state = BR_STATE_FORWARDING;
f4b7002a	38	struct net_bridge_vlan *vlan;
31a4562d	39	const unsigned char *dest;
78851988	40	u16 vid = 0;
1da177e4	41
8bd67ebb NA	42	if (unlikely(reason != SKB_NOT_DROPPED_YET)) {
	43	kfree_skb_reason(skb, reason);
	44	return NETDEV_TX_OK;
	45	}
	46
fd65e5a9	47	memset(skb->cb, 0, sizeof(struct br_input_skb_cb));
7b4858df	48	br_tc_skb_miss_set(skb, false);
fd65e5a9	49
c03307ea	50	rcu_read_lock();
1a4ba64d PNA	51	nf_ops = rcu_dereference(nf_br_ops);
1a4ba64d PNA	52	if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
c03307ea	53	rcu_read_unlock();
ea2d9b41 BDS	54	return NETDEV_TX_OK;
ea2d9b41 BDS	55	}
ea2d9b41	56
7609ecb2	57	dev_sw_netstats_tx_add(dev, 1, skb->len);
6088a539	58
f1c2eddf	59	br_switchdev_frame_unmark(skb);
14bb4789	60	BR_INPUT_SKB_CB(skb)->brdev = dev;
3c171f49	61	BR_INPUT_SKB_CB(skb)->frag_max_size = 0;
1da177e4	62
459a98ed	63	skb_reset_mac_header(skb);
1da177e4 LT	64	skb_pull(skb, ETH_HLEN);
1da177e4 LT	65
f4b7002a NA	66	if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid,
f4b7002a NA	67	&state, &vlan))
12464bb8 TM	68	goto out;
12464bb8 TM	69
057658cb	70	if (IS_ENABLED(CONFIG_INET) &&
823d81b0 NA	71	(eth_hdr(skb)->h_proto == htons(ETH_P_ARP) \|\|
823d81b0 NA	72	eth_hdr(skb)->h_proto == htons(ETH_P_RARP)) &&
c69c2cd4	73	br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
057658cb	74	br_do_proxy_suppress_arp(skb, br, vid, NULL);
ed842fae RP	75	} else if (IS_ENABLED(CONFIG_IPV6) &&
ed842fae RP	76	skb->protocol == htons(ETH_P_IPV6) &&
c69c2cd4	77	br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
ed842fae RP	78	pskb_may_pull(skb, sizeof(struct ipv6hdr) +
	79	sizeof(struct nd_msg)) &&
	80	ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
	81	struct nd_msg *msg, _msg;
	82
	83	msg = br_is_nd_neigh_msg(skb, &_msg);
	84	if (msg)
	85	br_do_suppress_nd(skb, br, vid, NULL, msg);
057658cb RP	86	}
057658cb RP	87
31a4562d	88	dest = eth_hdr(skb)->h_dest;
37b090e6	89	if (is_broadcast_ether_addr(dest)) {
e408336a	90	br_flood(br, skb, BR_PKT_BROADCAST, false, true, vid);
37b090e6	91	} else if (is_multicast_ether_addr(dest)) {
91d2c34a	92	if (unlikely(netpoll_tx_running(dev))) {
e408336a	93	br_flood(br, skb, BR_PKT_MULTICAST, false, true, vid);
91d2c34a HX	94	goto out;
91d2c34a HX	95	}
f4b7002a	96	if (br_multicast_rcv(&brmctx, &pmctx_null, vlan, skb, vid)) {
6d1d1d39	97	kfree_skb(skb);
c4fcb78c	98	goto out;
6d1d1d39	99	}
c4fcb78c	100
6d0259dd	101	mdst = br_mdb_entry_skb_get(brmctx, skb, vid);
b00589af	102	if ((mdst \|\| BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
adc47037 NA	103	br_multicast_querier_exists(brmctx, eth_hdr(skb), mdst))
adc47037 NA	104	br_multicast_flood(mdst, skb, brmctx, false, true);
c4fcb78c	105	else
e408336a	106	br_flood(br, skb, BR_PKT_MULTICAST, false, true, vid);
bfd0aeac	107	} else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
37b090e6 NA	108	br_forward(dst->dst, skb, false, true);
37b090e6 NA	109	} else {
e408336a	110	br_flood(br, skb, BR_PKT_UNICAST, false, true, vid);
37b090e6	111	}
c4fcb78c	112	out:
eeaf61d8	113	rcu_read_unlock();
6ed10654	114	return NETDEV_TX_OK;
1da177e4 LT	115	}
1da177e4 LT	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
eb793583	122	err = br_fdb_hash_init(br);
d35150c7	123	if (err)
eb793583	124	return err;
eb793583	125
19e3a9c9 NA	126	err = br_mdb_hash_init(br);
19e3a9c9 NA	127	if (err) {
19e3a9c9 NA	128	br_fdb_hash_fini(br);
	129	return err;
	130	}
	131
5be5a2df	132	err = br_vlan_init(br);
1080ab95	133	if (err) {
19e3a9c9	134	br_mdb_hash_fini(br);
eb793583	135	br_fdb_hash_fini(br);
1080ab95 NA	136	return err;
	137	}
	138
	139	err = br_multicast_init_stats(br);
	140	if (err) {
1080ab95	141	br_vlan_flush(br);
19e3a9c9	142	br_mdb_hash_fini(br);
eb793583	143	br_fdb_hash_fini(br);
82a48aff	144	return err;
1080ab95	145	}
5be5a2df	146
c74e1039	147	netdev_lockdep_set_classes(dev);
82a48aff	148	return 0;
bb900b27	149	}
bb900b27	150
b6fe0440 IS	151	static void br_dev_uninit(struct net_device *dev)
	152	{
	153	struct net_bridge *br = netdev_priv(dev);
	154
b1b9d366	155	br_multicast_dev_del(br);
b6fe0440 IS	156	br_multicast_uninit_stats(br);
b6fe0440 IS	157	br_vlan_flush(br);
19e3a9c9	158	br_mdb_hash_fini(br);
eb793583	159	br_fdb_hash_fini(br);
b6fe0440 IS	160	}
b6fe0440 IS	161
1da177e4 LT	162	static int br_dev_open(struct net_device *dev)
1da177e4 LT	163	{
81d35307	164	struct net_bridge *br = netdev_priv(dev);
1da177e4	165
c4d27ef9	166	netdev_update_features(dev);
81d35307 SH	167	netif_start_queue(dev);
81d35307 SH	168	br_stp_enable_bridge(br);
3fe2d7c7	169	br_multicast_open(br);
1da177e4	170
851d0a73 JH	171	if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
	172	br_multicast_join_snoopers(br);
	173
1da177e4 LT	174	return 0;
	175	}
	176
	177	static void br_dev_set_multicast_list(struct net_device *dev)
	178	{
	179	}
	180
2796d0c6 VY	181	static void br_dev_change_rx_flags(struct net_device *dev, int change)
	182	{
	183	if (change & IFF_PROMISC)
	184	br_manage_promisc(netdev_priv(dev));
	185	}
	186
1da177e4 LT	187	static int br_dev_stop(struct net_device *dev)
1da177e4 LT	188	{
3fe2d7c7 HX	189	struct net_bridge *br = netdev_priv(dev);
	190
	191	br_stp_disable_bridge(br);
	192	br_multicast_stop(br);
1da177e4	193
851d0a73 JH	194	if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
	195	br_multicast_leave_snoopers(br);
	196
1da177e4 LT	197	netif_stop_queue(dev);
	198
	199	return 0;
	200	}
	201
	202	static int br_change_mtu(struct net_device *dev, int new_mtu)
	203	{
4adf0af6	204	struct net_bridge *br = netdev_priv(dev);
f40aa233	205
1eb2cded	206	WRITE_ONCE(dev->mtu, new_mtu);
4adf0af6	207
804b854d	208	/* this flag will be cleared if the MTU was automatically adjusted */
3341d917	209	br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
34666d46	210	#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
4adf0af6	211	/* remember the MTU in the rtable for PMTU */
defb3519	212	dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
4adf0af6 SW	213	#endif
4adf0af6 SW	214
1da177e4 LT	215	return 0;
	216	}
	217
ffe1d49c	218	/* Allow setting mac address to any valid ethernet address. */
4505a3ef SH	219	static int br_set_mac_address(struct net_device dev, void p)
	220	{
	221	struct net_bridge *br = netdev_priv(dev);
	222	struct sockaddr *addr = p;
ffe1d49c SH	223
ffe1d49c SH	224	if (!is_valid_ether_addr(addr->sa_data))
7ca1e11a	225	return -EADDRNOTAVAIL;
4505a3ef	226
c4b4c421 NA	227	/* dev_set_mac_addr() can be called by a master device on bridge's
	228	* NETDEV_UNREGISTER, but since it's being destroyed do nothing
	229	*/
	230	if (dev->reg_state != NETREG_REGISTERED)
	231	return -EBUSY;
	232
4505a3ef	233	spin_lock_bh(&br->lock);
9a7b6ef9	234	if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
a3ebb7ef	235	/* Mac address will be changed in br_stp_change_bridge_id(). */
43598813	236	br_stp_change_bridge_id(br, addr->sa_data);
43598813	237	}
4505a3ef SH	238	spin_unlock_bh(&br->lock);
4505a3ef SH	239
ffe1d49c	240	return 0;
4505a3ef SH	241	}
4505a3ef SH	242
edb5e46f SH	243	static void br_getinfo(struct net_device dev, struct ethtool_drvinfo info)
edb5e46f SH	244	{
993e1634 WS	245	strscpy(info->driver, "bridge", sizeof(info->driver));
	246	strscpy(info->version, BR_VERSION, sizeof(info->version));
	247	strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
	248	strscpy(info->bus_info, "N/A", sizeof(info->bus_info));
edb5e46f SH	249	}
edb5e46f SH	250
542575fe MS	251	static int br_get_link_ksettings(struct net_device *dev,
	252	struct ethtool_link_ksettings *cmd)
	253	{
	254	struct net_bridge *br = netdev_priv(dev);
	255	struct net_bridge_port *p;
	256
	257	cmd->base.duplex = DUPLEX_UNKNOWN;
	258	cmd->base.port = PORT_OTHER;
	259	cmd->base.speed = SPEED_UNKNOWN;
	260
	261	list_for_each_entry(p, &br->port_list, list) {
	262	struct ethtool_link_ksettings ecmd;
	263	struct net_device *pdev = p->dev;
	264
	265	if (!netif_running(pdev) \|\| !netif_oper_up(pdev))
	266	continue;
	267
	268	if (__ethtool_get_link_ksettings(pdev, &ecmd))
	269	continue;
	270
	271	if (ecmd.base.speed == (__u32)SPEED_UNKNOWN)
	272	continue;
	273
	274	if (cmd->base.speed == (__u32)SPEED_UNKNOWN \|\|
	275	cmd->base.speed < ecmd.base.speed)
	276	cmd->base.speed = ecmd.base.speed;
	277	}
	278
	279	return 0;
	280	}
	281
c8f44aff MM	282	static netdev_features_t br_fix_features(struct net_device *dev,
c8f44aff MM	283	netdev_features_t features)
edb5e46f SH	284	{
	285	struct net_bridge *br = netdev_priv(dev);
	286
c4d27ef9	287	return br_features_recompute(br, features);
361ff8a6 JG	288	}
361ff8a6 JG	289
c06ee961	290	#ifdef CONFIG_NET_POLL_CONTROLLER
91d2c34a	291	static void br_poll_controller(struct net_device *br_dev)
c06ee961	292	{
c06ee961 WC	293	}
c06ee961 WC	294
91d2c34a	295	static void br_netpoll_cleanup(struct net_device *dev)
c06ee961	296	{
91d2c34a	297	struct net_bridge *br = netdev_priv(dev);
4e3828c4	298	struct net_bridge_port *p;
c06ee961	299
4e3828c4	300	list_for_each_entry(p, &br->port_list, list)
91d2c34a	301	br_netpoll_disable(p);
c06ee961 WC	302	}
c06ee961 WC	303
a8779ec1	304	static int __br_netpoll_enable(struct net_bridge_port *p)
dbe17307 CW	305	{
	306	struct netpoll *np;
	307	int err;
	308
a8779ec1	309	np = kzalloc(sizeof(*p->np), GFP_KERNEL);
dbe17307 CW	310	if (!np)
	311	return -ENOMEM;
	312
a8779ec1	313	err = __netpoll_setup(np, p->dev);
dbe17307 CW	314	if (err) {
	315	kfree(np);
	316	return err;
	317	}
	318
	319	p->np = np;
	320	return err;
	321	}
	322
a8779ec1	323	int br_netpoll_enable(struct net_bridge_port *p)
dbe17307 CW	324	{
	325	if (!p->br->dev->npinfo)
	326	return 0;
	327
a8779ec1	328	return __br_netpoll_enable(p);
dbe17307 CW	329	}
dbe17307 CW	330
a8779ec1	331	static int br_netpoll_setup(struct net_device dev, struct netpoll_info ni)
c06ee961	332	{
cfb478da	333	struct net_bridge *br = netdev_priv(dev);
4e3828c4	334	struct net_bridge_port *p;
91d2c34a	335	int err = 0;
c06ee961	336
4e3828c4	337	list_for_each_entry(p, &br->port_list, list) {
91d2c34a HX	338	if (!p->dev)
91d2c34a HX	339	continue;
a8779ec1	340	err = __br_netpoll_enable(p);
91d2c34a HX	341	if (err)
91d2c34a HX	342	goto fail;
c06ee961	343	}
91d2c34a HX	344
	345	out:
	346	return err;
	347
	348	fail:
	349	br_netpoll_cleanup(dev);
	350	goto out;
c06ee961 WC	351	}
c06ee961 WC	352
91d2c34a	353	void br_netpoll_disable(struct net_bridge_port *p)
c06ee961	354	{
91d2c34a HX	355	struct netpoll *np = p->np;
	356
	357	if (!np)
	358	return;
	359
	360	p->np = NULL;
	361
c9fbd71f	362	__netpoll_free(np);
c06ee961 WC	363	}
	364
	365	#endif
	366
33eaf2a6 DA	367	static int br_add_slave(struct net_device dev, struct net_device slave_dev,
33eaf2a6 DA	368	struct netlink_ext_ack *extack)
afc6151a JP	369
	370	{
	371	struct net_bridge *br = netdev_priv(dev);
	372
ca752be0	373	return br_add_if(br, slave_dev, extack);
afc6151a JP	374	}
	375
	376	static int br_del_slave(struct net_device dev, struct net_device slave_dev)
	377	{
	378	struct net_bridge *br = netdev_priv(dev);
	379
	380	return br_del_if(br, slave_dev);
	381	}
	382
ec9d16ba PNA	383	static int br_fill_forward_path(struct net_device_path_ctx *ctx,
	384	struct net_device_path *path)
	385	{
	386	struct net_bridge_fdb_entry *f;
	387	struct net_bridge_port *dst;
	388	struct net_bridge *br;
	389
	390	if (netif_is_bridge_port(ctx->dev))
	391	return -1;
	392
	393	br = netdev_priv(ctx->dev);
bcf2766b FF	394
	395	br_vlan_fill_forward_path_pvid(br, ctx, path);
	396
	397	f = br_fdb_find_rcu(br, ctx->daddr, path->bridge.vlan_id);
e7d96e75	398	if (!f)
ec9d16ba PNA	399	return -1;
	400
	401	dst = READ_ONCE(f->dst);
	402	if (!dst)
	403	return -1;
	404
bcf2766b FF	405	if (br_vlan_fill_forward_path_mode(br, dst, path))
	406	return -1;
	407
ec9d16ba PNA	408	path->type = DEV_PATH_BRIDGE;
	409	path->dev = dst->br->dev;
	410	ctx->dev = dst->dev;
	411
bcf2766b FF	412	switch (path->bridge.vlan_mode) {
	413	case DEV_PATH_BR_VLAN_TAG:
	414	if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
	415	return -ENOSPC;
	416	ctx->vlan[ctx->num_vlans].id = path->bridge.vlan_id;
	417	ctx->vlan[ctx->num_vlans].proto = path->bridge.vlan_proto;
	418	ctx->num_vlans++;
	419	break;
26267bf9	420	case DEV_PATH_BR_VLAN_UNTAG_HW:
bcf2766b FF	421	case DEV_PATH_BR_VLAN_UNTAG:
	422	ctx->num_vlans--;
	423	break;
	424	case DEV_PATH_BR_VLAN_KEEP:
	425	break;
	426	}
	427
ec9d16ba PNA	428	return 0;
	429	}
	430
a2dbb882	431	static const struct ethtool_ops br_ethtool_ops = {
542575fe MS	432	.get_drvinfo = br_getinfo,
	433	.get_link = ethtool_op_get_link,
	434	.get_link_ksettings = br_get_link_ksettings,
edb5e46f SH	435	};
edb5e46f SH	436
a2dbb882 SH	437	static const struct net_device_ops br_netdev_ops = {
	438	.ndo_open = br_dev_open,
	439	.ndo_stop = br_dev_stop,
bb900b27	440	.ndo_init = br_dev_init,
b6fe0440	441	.ndo_uninit = br_dev_uninit,
00829823	442	.ndo_start_xmit = br_dev_xmit,
7609ecb2	443	.ndo_get_stats64 = dev_get_tstats64,
00829823	444	.ndo_set_mac_address = br_set_mac_address,
afc4b13d	445	.ndo_set_rx_mode = br_dev_set_multicast_list,
2796d0c6	446	.ndo_change_rx_flags = br_dev_change_rx_flags,
00829823	447	.ndo_change_mtu = br_change_mtu,
561d8352	448	.ndo_siocdevprivate = br_dev_siocdevprivate,
c06ee961	449	#ifdef CONFIG_NET_POLL_CONTROLLER
91d2c34a	450	.ndo_netpoll_setup = br_netpoll_setup,
c06ee961 WC	451	.ndo_netpoll_cleanup = br_netpoll_cleanup,
	452	.ndo_poll_controller = br_poll_controller,
	453	#endif
afc6151a JP	454	.ndo_add_slave = br_add_slave,
afc6151a JP	455	.ndo_del_slave = br_del_slave,
c4d27ef9	456	.ndo_fix_features = br_fix_features,
77162022 JF	457	.ndo_fdb_add = br_fdb_add,
77162022 JF	458	.ndo_fdb_del = br_fdb_delete,
edaef191	459	.ndo_fdb_del_bulk = br_fdb_delete_bulk,
77162022	460	.ndo_fdb_dump = br_fdb_dump,
47674562	461	.ndo_fdb_get = br_fdb_get,
cc7f5022 IS	462	.ndo_mdb_add = br_mdb_add,
cc7f5022 IS	463	.ndo_mdb_del = br_mdb_del,
a6acb535	464	.ndo_mdb_del_bulk = br_mdb_del_bulk,
cc7f5022	465	.ndo_mdb_dump = br_mdb_dump,
68b380a3	466	.ndo_mdb_get = br_mdb_get,
e5a55a89 JF	467	.ndo_bridge_getlink = br_getlink,
e5a55a89 JF	468	.ndo_bridge_setlink = br_setlink,
407af329	469	.ndo_bridge_dellink = br_dellink,
66780530	470	.ndo_features_check = passthru_features_check,
ec9d16ba	471	.ndo_fill_forward_path = br_fill_forward_path,
a2dbb882 SH	472	};
a2dbb882 SH	473
bbc7e4cc	474	static const struct device_type br_type = {
bb900b27	475	.name = "bridge",
	476	};
	477
1da177e4 LT	478	void br_dev_setup(struct net_device *dev)
1da177e4 LT	479	{
bb900b27	480	struct net_bridge *br = netdev_priv(dev);
bb900b27	481
7ce5d222	482	eth_hw_addr_random(dev);
1da177e4 LT	483	ether_setup(dev);
1da177e4 LT	484
a2dbb882	485	dev->netdev_ops = &br_netdev_ops;
cf124db5	486	dev->needs_free_netdev = true;
7ad24ea4	487	dev->ethtool_ops = &br_ethtool_ops;
bb900b27	488	SET_NETDEV_DEVTYPE(dev, &br_type);
ccecb2a4	489	dev->priv_flags = IFF_EBRIDGE \| IFF_NO_QUEUE;
00d066a4	490	dev->lltx = true;
05c1280a	491	dev->netns_local = true;
edb5e46f	492
05c1280a AL	493	dev->features = COMMON_FEATURES \| NETIF_F_HW_VLAN_CTAG_TX \|
05c1280a AL	494	NETIF_F_HW_VLAN_STAG_TX;
1c5abb6c TM	495	dev->hw_features = COMMON_FEATURES \| NETIF_F_HW_VLAN_CTAG_TX \|
1c5abb6c TM	496	NETIF_F_HW_VLAN_STAG_TX;
161f65ba	497	dev->vlan_features = COMMON_FEATURES;
d35150c7	498	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
bb900b27	499
	500	br->dev = dev;
	501	spin_lock_init(&br->lock);
	502	INIT_LIST_HEAD(&br->port_list);
eb793583	503	INIT_HLIST_HEAD(&br->fdb_list);
90c628dd	504	INIT_HLIST_HEAD(&br->frame_type_list);
65369933	505	#if IS_ENABLED(CONFIG_BRIDGE_MRP)
0169b820	506	INIT_HLIST_HEAD(&br->mrp_list);
f323aa54 HB	507	#endif
	508	#if IS_ENABLED(CONFIG_BRIDGE_CFM)
	509	INIT_HLIST_HEAD(&br->mep_list);
65369933	510	#endif
bb900b27	511	spin_lock_init(&br->hash_lock);
	512
	513	br->bridge_id.prio[0] = 0x80;
	514	br->bridge_id.prio[1] = 0x00;
	515
05428729	516	ether_addr_copy(br->group_addr, eth_stp_addr);
bb900b27	517
bb900b27	518	br->stp_enabled = BR_NO_STP;
515853cc	519	br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
f2808d22	520	br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
515853cc	521
bb900b27	522	br->designated_root = br->bridge_id;
	523	br->bridge_max_age = br->max_age = 20 * HZ;
	524	br->bridge_hello_time = br->hello_time = 2 * HZ;
	525	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
34d8acd8	526	br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
91572088	527	dev->max_mtu = ETH_MAX_MTU;
bb900b27	528
	529	br_netfilter_rtable_init(br);
	530	br_stp_timer_init(br);
	531	br_multicast_init(br);
f7cdee8a	532	INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
1da177e4	533	}