[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / net / bridge / br_mdb.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/err.h>
#include <linux/igmp.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/rculist.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <net/ip.h>
#include <net/netlink.h>
#include <net/switchdev.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
#include <net/addrconf.h>
#endif

#include "br_private.h"

static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
			       struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_port *p;
	struct nlattr *nest, *port_nest;

	if (!br->multicast_router || hlist_empty(&br->router_list))
		return 0;

	nest = nla_nest_start(skb, MDBA_ROUTER);
	if (nest == NULL)
		return -EMSGSIZE;

	hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
		if (!p)
			continue;
		port_nest = nla_nest_start(skb, MDBA_ROUTER_PORT);
		if (!port_nest)
			goto fail;
		if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) ||
		    nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER,
				br_timer_value(&p->multicast_router_timer)) ||
		    nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
			       p->multicast_router)) {
			nla_nest_cancel(skb, port_nest);
			goto fail;
		}
		nla_nest_end(skb, port_nest);
	}

	nla_nest_end(skb, nest);
	return 0;
fail:
	nla_nest_cancel(skb, nest);
	return -EMSGSIZE;
}

static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
{
	e->state = flags & MDB_PG_FLAGS_PERMANENT;
	e->flags = 0;
	if (flags & MDB_PG_FLAGS_OFFLOAD)
		e->flags |= MDB_FLAGS_OFFLOAD;
}

static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip)
{
	memset(ip, 0, sizeof(struct br_ip));
	ip->vid = entry->vid;
	ip->proto = entry->addr.proto;
	if (ip->proto == htons(ETH_P_IP))
		ip->u.ip4 = entry->addr.u.ip4;
#if IS_ENABLED(CONFIG_IPV6)
	else
		ip->u.ip6 = entry->addr.u.ip6;
#endif
}

static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
			    struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_mdb_htable *mdb;
	struct nlattr *nest, *nest2;
	int i, err = 0;
	int idx = 0, s_idx = cb->args[1];

	if (br->multicast_disabled)
		return 0;

	mdb = rcu_dereference(br->mdb);
	if (!mdb)
		return 0;

	nest = nla_nest_start(skb, MDBA_MDB);
	if (nest == NULL)
		return -EMSGSIZE;

	for (i = 0; i < mdb->max; i++) {
		struct net_bridge_mdb_entry *mp;
		struct net_bridge_port_group *p;
		struct net_bridge_port_group __rcu **pp;
		struct net_bridge_port *port;

		hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
			if (idx < s_idx)
				goto skip;

			nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
			if (nest2 == NULL) {
				err = -EMSGSIZE;
				goto out;
			}

			for (pp = &mp->ports;
			     (p = rcu_dereference(*pp)) != NULL;
			      pp = &p->next) {
				struct nlattr *nest_ent;
				struct br_mdb_entry e;

				port = p->port;
				if (!port)
					continue;

				memset(&e, 0, sizeof(e));
				e.ifindex = port->dev->ifindex;
				e.vid = p->addr.vid;
				__mdb_entry_fill_flags(&e, p->flags);
				if (p->addr.proto == htons(ETH_P_IP))
					e.addr.u.ip4 = p->addr.u.ip4;
#if IS_ENABLED(CONFIG_IPV6)
				if (p->addr.proto == htons(ETH_P_IPV6))
					e.addr.u.ip6 = p->addr.u.ip6;
#endif
				e.addr.proto = p->addr.proto;
				nest_ent = nla_nest_start(skb,
							  MDBA_MDB_ENTRY_INFO);
				if (!nest_ent) {
					nla_nest_cancel(skb, nest2);
					err = -EMSGSIZE;
					goto out;
				}
				if (nla_put_nohdr(skb, sizeof(e), &e) ||
				    nla_put_u32(skb,
						MDBA_MDB_EATTR_TIMER,
						br_timer_value(&p->timer))) {
					nla_nest_cancel(skb, nest_ent);
					nla_nest_cancel(skb, nest2);
					err = -EMSGSIZE;
					goto out;
				}
				nla_nest_end(skb, nest_ent);
			}
			nla_nest_end(skb, nest2);
		skip:
			idx++;
		}
	}

out:
	cb->args[1] = idx;
	nla_nest_end(skb, nest);
	return err;
}

static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct net_device *dev;
	struct net *net = sock_net(skb->sk);
	struct nlmsghdr *nlh = NULL;
	int idx = 0, s_idx;

	s_idx = cb->args[0];

	rcu_read_lock();

	/* In theory this could be wrapped to 0... */
	cb->seq = net->dev_base_seq + br_mdb_rehash_seq;

	for_each_netdev_rcu(net, dev) {
		if (dev->priv_flags & IFF_EBRIDGE) {
			struct br_port_msg *bpm;

			if (idx < s_idx)
				goto skip;

			nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
					cb->nlh->nlmsg_seq, RTM_GETMDB,
					sizeof(*bpm), NLM_F_MULTI);
			if (nlh == NULL)
				break;

			bpm = nlmsg_data(nlh);
			memset(bpm, 0, sizeof(*bpm));
			bpm->ifindex = dev->ifindex;
			if (br_mdb_fill_info(skb, cb, dev) < 0)
				goto out;
			if (br_rports_fill_info(skb, cb, dev) < 0)
				goto out;

			cb->args[1] = 0;
			nlmsg_end(skb, nlh);
		skip:
			idx++;
		}
	}

out:
	if (nlh)
		nlmsg_end(skb, nlh);
	rcu_read_unlock();
	cb->args[0] = idx;
	return skb->len;
}

static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
				   struct net_device *dev,
				   struct br_mdb_entry *entry, u32 pid,
				   u32 seq, int type, unsigned int flags)
{
	struct nlmsghdr *nlh;
	struct br_port_msg *bpm;
	struct nlattr *nest, *nest2;

	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
	if (!nlh)
		return -EMSGSIZE;

	bpm = nlmsg_data(nlh);
	memset(bpm, 0, sizeof(*bpm));
	bpm->family  = AF_BRIDGE;
	bpm->ifindex = dev->ifindex;
	nest = nla_nest_start(skb, MDBA_MDB);
	if (nest == NULL)
		goto cancel;
	nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
	if (nest2 == NULL)
		goto end;

	if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
		goto end;

	nla_nest_end(skb, nest2);
	nla_nest_end(skb, nest);
	nlmsg_end(skb, nlh);
	return 0;

end:
	nla_nest_end(skb, nest);
cancel:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

static inline size_t rtnl_mdb_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct br_port_msg))
		+ nla_total_size(sizeof(struct br_mdb_entry));
}

struct br_mdb_complete_info {
	struct net_bridge_port *port;
	struct br_ip ip;
};

static void br_mdb_complete(struct net_device *dev, int err, void *priv)
{
	struct br_mdb_complete_info *data = priv;
	struct net_bridge_port_group __rcu **pp;
	struct net_bridge_port_group *p;
	struct net_bridge_mdb_htable *mdb;
	struct net_bridge_mdb_entry *mp;
	struct net_bridge_port *port = data->port;
	struct net_bridge *br = port->br;

	if (err)
		goto err;

	spin_lock_bh(&br->multicast_lock);
	mdb = mlock_dereference(br->mdb, br);
	mp = br_mdb_ip_get(mdb, &data->ip);
	if (!mp)
		goto out;
	for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
		if (p->port != port)
			continue;
		p->flags |= MDB_PG_FLAGS_OFFLOAD;
	}
out:
	spin_unlock_bh(&br->multicast_lock);
err:
	kfree(priv);
}

static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p,
			    struct br_mdb_entry *entry, int type)
{
	struct br_mdb_complete_info *complete_info;
	struct switchdev_obj_port_mdb mdb = {
		.obj = {
			.id = SWITCHDEV_OBJ_ID_PORT_MDB,
			.flags = SWITCHDEV_F_DEFER,
		},
		.vid = entry->vid,
	};
	struct net_device *port_dev;
	struct net *net = dev_net(dev);
	struct sk_buff *skb;
	int err = -ENOBUFS;

	port_dev = __dev_get_by_index(net, entry->ifindex);
	if (entry->addr.proto == htons(ETH_P_IP))
		ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
#if IS_ENABLED(CONFIG_IPV6)
	else
		ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
#endif

	mdb.obj.orig_dev = port_dev;
	if (port_dev && type == RTM_NEWMDB) {
		complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
		if (complete_info) {
			complete_info->port = p;
			__mdb_entry_to_br_ip(entry, &complete_info->ip);
			mdb.obj.complete_priv = complete_info;
			mdb.obj.complete = br_mdb_complete;
			if (switchdev_port_obj_add(port_dev, &mdb.obj))
				kfree(complete_info);
		}
	} else if (port_dev && type == RTM_DELMDB) {
		switchdev_port_obj_del(port_dev, &mdb.obj);
	}

	skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
	if (!skb)
		goto errout;

	err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
	if (err < 0) {
		kfree_skb(skb);
		goto errout;
	}

	rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
	return;
errout:
	rtnl_set_sk_err(net, RTNLGRP_MDB, err);
}

void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
		   struct br_ip *group, int type, u8 flags)
{
	struct br_mdb_entry entry;

	memset(&entry, 0, sizeof(entry));
	entry.ifindex = port->dev->ifindex;
	entry.addr.proto = group->proto;
	entry.addr.u.ip4 = group->u.ip4;
#if IS_ENABLED(CONFIG_IPV6)
	entry.addr.u.ip6 = group->u.ip6;
#endif
	entry.vid = group->vid;
	__mdb_entry_fill_flags(&entry, flags);
	__br_mdb_notify(dev, port, &entry, type);
}

static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
				   struct net_device *dev,
				   int ifindex, u32 pid,
				   u32 seq, int type, unsigned int flags)
{
	struct br_port_msg *bpm;
	struct nlmsghdr *nlh;
	struct nlattr *nest;

	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
	if (!nlh)
		return -EMSGSIZE;

	bpm = nlmsg_data(nlh);
	memset(bpm, 0, sizeof(*bpm));
	bpm->family = AF_BRIDGE;
	bpm->ifindex = dev->ifindex;
	nest = nla_nest_start(skb, MDBA_ROUTER);
	if (!nest)
		goto cancel;

	if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
		goto end;

	nla_nest_end(skb, nest);
	nlmsg_end(skb, nlh);
	return 0;

end:
	nla_nest_end(skb, nest);
cancel:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

static inline size_t rtnl_rtr_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct br_port_msg))
		+ nla_total_size(sizeof(__u32));
}

void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
		   int type)
{
	struct net *net = dev_net(dev);
	struct sk_buff *skb;
	int err = -ENOBUFS;
	int ifindex;

	ifindex = port ? port->dev->ifindex : 0;
	skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
	if (!skb)
		goto errout;

	err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
	if (err < 0) {
		kfree_skb(skb);
		goto errout;
	}

	rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
	return;

errout:
	rtnl_set_sk_err(net, RTNLGRP_MDB, err);
}

static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
{
	if (entry->ifindex == 0)
		return false;

	if (entry->addr.proto == htons(ETH_P_IP)) {
		if (!ipv4_is_multicast(entry->addr.u.ip4))
			return false;
		if (ipv4_is_local_multicast(entry->addr.u.ip4))
			return false;
#if IS_ENABLED(CONFIG_IPV6)
	} else if (entry->addr.proto == htons(ETH_P_IPV6)) {
		if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
			return false;
#endif
	} else
		return false;
	if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
		return false;
	if (entry->vid >= VLAN_VID_MASK)
		return false;

	return true;
}

static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
			struct net_device **pdev, struct br_mdb_entry **pentry)
{
	struct net *net = sock_net(skb->sk);
	struct br_mdb_entry *entry;
	struct br_port_msg *bpm;
	struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
	struct net_device *dev;
	int err;

	err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL,
			  NULL);
	if (err < 0)
		return err;

	bpm = nlmsg_data(nlh);
	if (bpm->ifindex == 0) {
		pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
		return -EINVAL;
	}

	dev = __dev_get_by_index(net, bpm->ifindex);
	if (dev == NULL) {
		pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
		return -ENODEV;
	}

	if (!(dev->priv_flags & IFF_EBRIDGE)) {
		pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
		return -EOPNOTSUPP;
	}

	*pdev = dev;

	if (!tb[MDBA_SET_ENTRY] ||
	    nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
		pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
		return -EINVAL;
	}

	entry = nla_data(tb[MDBA_SET_ENTRY]);
	if (!is_valid_mdb_entry(entry)) {
		pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
		return -EINVAL;
	}

	*pentry = entry;
	return 0;
}

static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
			    struct br_ip *group, unsigned char state)
{
	struct net_bridge_mdb_entry *mp;
	struct net_bridge_port_group *p;
	struct net_bridge_port_group __rcu **pp;
	struct net_bridge_mdb_htable *mdb;
	unsigned long now = jiffies;
	int err;

	mdb = mlock_dereference(br->mdb, br);
	mp = br_mdb_ip_get(mdb, group);
	if (!mp) {
		mp = br_multicast_new_group(br, port, group);
		err = PTR_ERR_OR_ZERO(mp);
		if (err)
			return err;
	}

	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
		if (p->port == port)
			return -EEXIST;
		if ((unsigned long)p->port < (unsigned long)port)
			break;
	}

	p = br_multicast_new_port_group(port, group, *pp, state, NULL);
	if (unlikely(!p))
		return -ENOMEM;
	rcu_assign_pointer(*pp, p);
	if (state == MDB_TEMPORARY)
		mod_timer(&p->timer, now + br->multicast_membership_interval);

	return 0;
}

static int __br_mdb_add(struct net *net, struct net_bridge *br,
			struct br_mdb_entry *entry)
{
	struct br_ip ip;
	struct net_device *dev;
	struct net_bridge_port *p;
	int ret;

	if (!netif_running(br->dev) || br->multicast_disabled)
		return -EINVAL;

	dev = __dev_get_by_index(net, entry->ifindex);
	if (!dev)
		return -ENODEV;

	p = br_port_get_rtnl(dev);
	if (!p || p->br != br || p->state == BR_STATE_DISABLED)
		return -EINVAL;

	__mdb_entry_to_br_ip(entry, &ip);

	spin_lock_bh(&br->multicast_lock);
	ret = br_mdb_add_group(br, p, &ip, entry->state);
	spin_unlock_bh(&br->multicast_lock);
	return ret;
}

static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
		      struct netlink_ext_ack *extack)
{
	struct net *net = sock_net(skb->sk);
	struct net_bridge_vlan_group *vg;
	struct net_device *dev, *pdev;
	struct br_mdb_entry *entry;
	struct net_bridge_port *p;
	struct net_bridge_vlan *v;
	struct net_bridge *br;
	int err;

	err = br_mdb_parse(skb, nlh, &dev, &entry);
	if (err < 0)
		return err;

	br = netdev_priv(dev);

	/* If vlan filtering is enabled and VLAN is not specified
	 * install mdb entry on all vlans configured on the port.
	 */
	pdev = __dev_get_by_index(net, entry->ifindex);
	if (!pdev)
		return -ENODEV;

	p = br_port_get_rtnl(pdev);
	if (!p || p->br != br || p->state == BR_STATE_DISABLED)
		return -EINVAL;

	vg = nbp_vlan_group(p);
	if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
		list_for_each_entry(v, &vg->vlan_list, vlist) {
			entry->vid = v->vid;
			err = __br_mdb_add(net, br, entry);
			if (err)
				break;
			__br_mdb_notify(dev, p, entry, RTM_NEWMDB);
		}
	} else {
		err = __br_mdb_add(net, br, entry);
		if (!err)
			__br_mdb_notify(dev, p, entry, RTM_NEWMDB);
	}

	return err;
}

static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
{
	struct net_bridge_mdb_htable *mdb;
	struct net_bridge_mdb_entry *mp;
	struct net_bridge_port_group *p;
	struct net_bridge_port_group __rcu **pp;
	struct br_ip ip;
	int err = -EINVAL;

	if (!netif_running(br->dev) || br->multicast_disabled)
		return -EINVAL;

	__mdb_entry_to_br_ip(entry, &ip);

	spin_lock_bh(&br->multicast_lock);
	mdb = mlock_dereference(br->mdb, br);

	mp = br_mdb_ip_get(mdb, &ip);
	if (!mp)
		goto unlock;

	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
		if (!p->port || p->port->dev->ifindex != entry->ifindex)
			continue;

		if (p->port->state == BR_STATE_DISABLED)
			goto unlock;

		__mdb_entry_fill_flags(entry, p->flags);
		rcu_assign_pointer(*pp, p->next);
		hlist_del_init(&p->mglist);
		del_timer(&p->timer);
		call_rcu_bh(&p->rcu, br_multicast_free_pg);
		err = 0;

		if (!mp->ports && !mp->mglist &&
		    netif_running(br->dev))
			mod_timer(&mp->timer, jiffies);
		break;
	}

unlock:
	spin_unlock_bh(&br->multicast_lock);
	return err;
}

static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
		      struct netlink_ext_ack *extack)
{
	struct net *net = sock_net(skb->sk);
	struct net_bridge_vlan_group *vg;
	struct net_device *dev, *pdev;
	struct br_mdb_entry *entry;
	struct net_bridge_port *p;
	struct net_bridge_vlan *v;
	struct net_bridge *br;
	int err;

	err = br_mdb_parse(skb, nlh, &dev, &entry);
	if (err < 0)
		return err;

	br = netdev_priv(dev);

	/* If vlan filtering is enabled and VLAN is not specified
	 * delete mdb entry on all vlans configured on the port.
	 */
	pdev = __dev_get_by_index(net, entry->ifindex);
	if (!pdev)
		return -ENODEV;

	p = br_port_get_rtnl(pdev);
	if (!p || p->br != br || p->state == BR_STATE_DISABLED)
		return -EINVAL;

	vg = nbp_vlan_group(p);
	if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
		list_for_each_entry(v, &vg->vlan_list, vlist) {
			entry->vid = v->vid;
			err = __br_mdb_del(br, entry);
			if (!err)
				__br_mdb_notify(dev, p, entry, RTM_DELMDB);
		}
	} else {
		err = __br_mdb_del(br, entry);
		if (!err)
			__br_mdb_notify(dev, p, entry, RTM_DELMDB);
	}

	return err;
}

void br_mdb_init(void)
{
	rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0);
	rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0);
	rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0);
}

void br_mdb_uninit(void)
{
	rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
	rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
	rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
ee07c6e7 CW	2	#include <linux/err.h>
	3	#include <linux/igmp.h>
	4	#include <linux/kernel.h>
	5	#include <linux/netdevice.h>
	6	#include <linux/rculist.h>
	7	#include <linux/skbuff.h>
cfd56754	8	#include <linux/if_ether.h>
ee07c6e7 CW	9	#include <net/ip.h>
ee07c6e7 CW	10	#include <net/netlink.h>
f1fecb1d	11	#include <net/switchdev.h>
ee07c6e7 CW	12	#if IS_ENABLED(CONFIG_IPV6)
ee07c6e7 CW	13	#include <net/ipv6.h>
3c3769e6	14	#include <net/addrconf.h>
ee07c6e7 CW	15	#endif
	16
	17	#include "br_private.h"
	18
	19	static int br_rports_fill_info(struct sk_buff skb, struct netlink_callback cb,
	20	struct net_device *dev)
	21	{
	22	struct net_bridge *br = netdev_priv(dev);
	23	struct net_bridge_port *p;
59f78f9f	24	struct nlattr nest, port_nest;
ee07c6e7 CW	25
	26	if (!br->multicast_router \|\| hlist_empty(&br->router_list))
	27	return 0;
	28
	29	nest = nla_nest_start(skb, MDBA_ROUTER);
	30	if (nest == NULL)
	31	return -EMSGSIZE;
	32
b67bfe0d	33	hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
59f78f9f NA	34	if (!p)
	35	continue;
	36	port_nest = nla_nest_start(skb, MDBA_ROUTER_PORT);
	37	if (!port_nest)
ee07c6e7	38	goto fail;
59f78f9f NA	39	if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) \|\|
	40	nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER,
	41	br_timer_value(&p->multicast_router_timer)) \|\|
	42	nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
	43	p->multicast_router)) {
	44	nla_nest_cancel(skb, port_nest);
	45	goto fail;
	46	}
	47	nla_nest_end(skb, port_nest);
ee07c6e7 CW	48	}
	49
	50	nla_nest_end(skb, nest);
	51	return 0;
	52	fail:
	53	nla_nest_cancel(skb, nest);
	54	return -EMSGSIZE;
	55	}
	56
9d06b6d8 ER	57	static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
	58	{
	59	e->state = flags & MDB_PG_FLAGS_PERMANENT;
	60	e->flags = 0;
	61	if (flags & MDB_PG_FLAGS_OFFLOAD)
	62	e->flags \|= MDB_FLAGS_OFFLOAD;
	63	}
	64
6dd684c0 ER	65	static void __mdb_entry_to_br_ip(struct br_mdb_entry entry, struct br_ip ip)
	66	{
	67	memset(ip, 0, sizeof(struct br_ip));
	68	ip->vid = entry->vid;
	69	ip->proto = entry->addr.proto;
	70	if (ip->proto == htons(ETH_P_IP))
	71	ip->u.ip4 = entry->addr.u.ip4;
	72	#if IS_ENABLED(CONFIG_IPV6)
	73	else
	74	ip->u.ip6 = entry->addr.u.ip6;
	75	#endif
	76	}
	77
ee07c6e7 CW	78	static int br_mdb_fill_info(struct sk_buff skb, struct netlink_callback cb,
	79	struct net_device *dev)
	80	{
	81	struct net_bridge *br = netdev_priv(dev);
	82	struct net_bridge_mdb_htable *mdb;
	83	struct nlattr nest, nest2;
	84	int i, err = 0;
	85	int idx = 0, s_idx = cb->args[1];
	86
	87	if (br->multicast_disabled)
	88	return 0;
	89
	90	mdb = rcu_dereference(br->mdb);
	91	if (!mdb)
	92	return 0;
	93
	94	nest = nla_nest_start(skb, MDBA_MDB);
	95	if (nest == NULL)
	96	return -EMSGSIZE;
	97
	98	for (i = 0; i < mdb->max; i++) {
ee07c6e7	99	struct net_bridge_mdb_entry *mp;
762a3d89	100	struct net_bridge_port_group *p;
762a3d89	101	struct net_bridge_port_group __rcu **pp;
ee07c6e7 CW	102	struct net_bridge_port *port;
ee07c6e7 CW	103
b67bfe0d	104	hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
ee07c6e7 CW	105	if (idx < s_idx)
	106	goto skip;
	107
	108	nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
	109	if (nest2 == NULL) {
	110	err = -EMSGSIZE;
	111	goto out;
	112	}
	113
	114	for (pp = &mp->ports;
	115	(p = rcu_dereference(*pp)) != NULL;
	116	pp = &p->next) {
21257156	117	struct nlattr *nest_ent;
76cc173d NA	118	struct br_mdb_entry e;
76cc173d NA	119
ee07c6e7	120	port = p->port;
76cc173d NA	121	if (!port)
76cc173d NA	122	continue;
21257156	123
76cc173d NA	124	memset(&e, 0, sizeof(e));
	125	e.ifindex = port->dev->ifindex;
	126	e.vid = p->addr.vid;
	127	__mdb_entry_fill_flags(&e, p->flags);
	128	if (p->addr.proto == htons(ETH_P_IP))
	129	e.addr.u.ip4 = p->addr.u.ip4;
ee07c6e7	130	#if IS_ENABLED(CONFIG_IPV6)
76cc173d NA	131	if (p->addr.proto == htons(ETH_P_IPV6))
76cc173d NA	132	e.addr.u.ip6 = p->addr.u.ip6;
ee07c6e7	133	#endif
76cc173d	134	e.addr.proto = p->addr.proto;
21257156 NA	135	nest_ent = nla_nest_start(skb,
	136	MDBA_MDB_ENTRY_INFO);
	137	if (!nest_ent) {
	138	nla_nest_cancel(skb, nest2);
	139	err = -EMSGSIZE;
	140	goto out;
	141	}
	142	if (nla_put_nohdr(skb, sizeof(e), &e) \|\|
	143	nla_put_u32(skb,
	144	MDBA_MDB_EATTR_TIMER,
	145	br_timer_value(&p->timer))) {
	146	nla_nest_cancel(skb, nest_ent);
76cc173d NA	147	nla_nest_cancel(skb, nest2);
	148	err = -EMSGSIZE;
	149	goto out;
ee07c6e7	150	}
21257156	151	nla_nest_end(skb, nest_ent);
ee07c6e7 CW	152	}
	153	nla_nest_end(skb, nest2);
	154	skip:
	155	idx++;
	156	}
	157	}
	158
	159	out:
	160	cb->args[1] = idx;
	161	nla_nest_end(skb, nest);
	162	return err;
	163	}
	164
	165	static int br_mdb_dump(struct sk_buff skb, struct netlink_callback cb)
	166	{
	167	struct net_device *dev;
	168	struct net *net = sock_net(skb->sk);
	169	struct nlmsghdr *nlh = NULL;
	170	int idx = 0, s_idx;
	171
	172	s_idx = cb->args[0];
	173
	174	rcu_read_lock();
	175
2ce297fc CW	176	/* In theory this could be wrapped to 0... */
2ce297fc CW	177	cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
ee07c6e7 CW	178
	179	for_each_netdev_rcu(net, dev) {
	180	if (dev->priv_flags & IFF_EBRIDGE) {
	181	struct br_port_msg *bpm;
	182
	183	if (idx < s_idx)
	184	goto skip;
	185
	186	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
	187	cb->nlh->nlmsg_seq, RTM_GETMDB,
	188	sizeof(*bpm), NLM_F_MULTI);
	189	if (nlh == NULL)
	190	break;
	191
	192	bpm = nlmsg_data(nlh);
c085c499	193	memset(bpm, 0, sizeof(*bpm));
ee07c6e7 CW	194	bpm->ifindex = dev->ifindex;
	195	if (br_mdb_fill_info(skb, cb, dev) < 0)
	196	goto out;
	197	if (br_rports_fill_info(skb, cb, dev) < 0)
	198	goto out;
	199
	200	cb->args[1] = 0;
	201	nlmsg_end(skb, nlh);
	202	skip:
	203	idx++;
	204	}
	205	}
	206
	207	out:
	208	if (nlh)
	209	nlmsg_end(skb, nlh);
	210	rcu_read_unlock();
	211	cb->args[0] = idx;
	212	return skb->len;
	213	}
	214
37a393bc CW	215	static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
	216	struct net_device *dev,
	217	struct br_mdb_entry *entry, u32 pid,
	218	u32 seq, int type, unsigned int flags)
	219	{
	220	struct nlmsghdr *nlh;
	221	struct br_port_msg *bpm;
	222	struct nlattr nest, nest2;
	223
82199679	224	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
37a393bc CW	225	if (!nlh)
	226	return -EMSGSIZE;
	227
	228	bpm = nlmsg_data(nlh);
c085c499	229	memset(bpm, 0, sizeof(*bpm));
37a393bc CW	230	bpm->family = AF_BRIDGE;
	231	bpm->ifindex = dev->ifindex;
	232	nest = nla_nest_start(skb, MDBA_MDB);
	233	if (nest == NULL)
	234	goto cancel;
	235	nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
	236	if (nest2 == NULL)
	237	goto end;
	238
	239	if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
	240	goto end;
	241
	242	nla_nest_end(skb, nest2);
	243	nla_nest_end(skb, nest);
053c095a JB	244	nlmsg_end(skb, nlh);
053c095a JB	245	return 0;
37a393bc CW	246
	247	end:
	248	nla_nest_end(skb, nest);
	249	cancel:
	250	nlmsg_cancel(skb, nlh);
	251	return -EMSGSIZE;
	252	}
	253
	254	static inline size_t rtnl_mdb_nlmsg_size(void)
	255	{
	256	return NLMSG_ALIGN(sizeof(struct br_port_msg))
	257	+ nla_total_size(sizeof(struct br_mdb_entry));
	258	}
	259
45ebcce5 ER	260	struct br_mdb_complete_info {
	261	struct net_bridge_port *port;
	262	struct br_ip ip;
	263	};
	264
	265	static void br_mdb_complete(struct net_device dev, int err, void priv)
37a393bc	266	{
45ebcce5 ER	267	struct br_mdb_complete_info *data = priv;
	268	struct net_bridge_port_group __rcu **pp;
	269	struct net_bridge_port_group *p;
	270	struct net_bridge_mdb_htable *mdb;
	271	struct net_bridge_mdb_entry *mp;
	272	struct net_bridge_port *port = data->port;
	273	struct net_bridge *br = port->br;
	274
	275	if (err)
	276	goto err;
	277
	278	spin_lock_bh(&br->multicast_lock);
	279	mdb = mlock_dereference(br->mdb, br);
	280	mp = br_mdb_ip_get(mdb, &data->ip);
	281	if (!mp)
	282	goto out;
	283	for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
	284	pp = &p->next) {
	285	if (p->port != port)
	286	continue;
	287	p->flags \|= MDB_PG_FLAGS_OFFLOAD;
	288	}
	289	out:
	290	spin_unlock_bh(&br->multicast_lock);
	291	err:
	292	kfree(priv);
	293	}
	294
	295	static void __br_mdb_notify(struct net_device dev, struct net_bridge_port p,
	296	struct br_mdb_entry *entry, int type)
	297	{
	298	struct br_mdb_complete_info *complete_info;
f1fecb1d ER	299	struct switchdev_obj_port_mdb mdb = {
	300	.obj = {
	301	.id = SWITCHDEV_OBJ_ID_PORT_MDB,
	302	.flags = SWITCHDEV_F_DEFER,
	303	},
	304	.vid = entry->vid,
	305	};
	306	struct net_device *port_dev;
37a393bc CW	307	struct net *net = dev_net(dev);
	308	struct sk_buff *skb;
	309	int err = -ENOBUFS;
	310
f1fecb1d ER	311	port_dev = __dev_get_by_index(net, entry->ifindex);
	312	if (entry->addr.proto == htons(ETH_P_IP))
	313	ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
	314	#if IS_ENABLED(CONFIG_IPV6)
	315	else
	316	ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
	317	#endif
	318
	319	mdb.obj.orig_dev = port_dev;
9e8430f8	320	if (port_dev && type == RTM_NEWMDB) {
45ebcce5 ER	321	complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
	322	if (complete_info) {
	323	complete_info->port = p;
	324	__mdb_entry_to_br_ip(entry, &complete_info->ip);
	325	mdb.obj.complete_priv = complete_info;
	326	mdb.obj.complete = br_mdb_complete;
1bfb1596 EV	327	if (switchdev_port_obj_add(port_dev, &mdb.obj))
1bfb1596 EV	328	kfree(complete_info);
45ebcce5	329	}
9e8430f8	330	} else if (port_dev && type == RTM_DELMDB) {
f1fecb1d	331	switchdev_port_obj_del(port_dev, &mdb.obj);
9e8430f8	332	}
f1fecb1d	333
37a393bc CW	334	skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
	335	if (!skb)
	336	goto errout;
	337
	338	err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
	339	if (err < 0) {
	340	kfree_skb(skb);
	341	goto errout;
	342	}
	343
	344	rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
	345	return;
	346	errout:
	347	rtnl_set_sk_err(net, RTNLGRP_MDB, err);
	348	}
	349
45ebcce5 ER	350	void br_mdb_notify(struct net_device dev, struct net_bridge_port port,
45ebcce5 ER	351	struct br_ip *group, int type, u8 flags)
37a393bc CW	352	{
	353	struct br_mdb_entry entry;
	354
c085c499	355	memset(&entry, 0, sizeof(entry));
45ebcce5 ER	356	entry.ifindex = port->dev->ifindex;
	357	entry.addr.proto = group->proto;
	358	entry.addr.u.ip4 = group->u.ip4;
37a393bc	359	#if IS_ENABLED(CONFIG_IPV6)
45ebcce5	360	entry.addr.u.ip6 = group->u.ip6;
37a393bc	361	#endif
45ebcce5 ER	362	entry.vid = group->vid;
	363	__mdb_entry_fill_flags(&entry, flags);
	364	__br_mdb_notify(dev, port, &entry, type);
37a393bc CW	365	}
37a393bc CW	366
949f1e39 SA	367	static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
	368	struct net_device *dev,
	369	int ifindex, u32 pid,
	370	u32 seq, int type, unsigned int flags)
	371	{
	372	struct br_port_msg *bpm;
	373	struct nlmsghdr *nlh;
	374	struct nlattr *nest;
	375
	376	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
	377	if (!nlh)
	378	return -EMSGSIZE;
	379
	380	bpm = nlmsg_data(nlh);
	381	memset(bpm, 0, sizeof(*bpm));
	382	bpm->family = AF_BRIDGE;
	383	bpm->ifindex = dev->ifindex;
	384	nest = nla_nest_start(skb, MDBA_ROUTER);
	385	if (!nest)
	386	goto cancel;
	387
	388	if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
	389	goto end;
	390
	391	nla_nest_end(skb, nest);
	392	nlmsg_end(skb, nlh);
	393	return 0;
	394
	395	end:
	396	nla_nest_end(skb, nest);
	397	cancel:
	398	nlmsg_cancel(skb, nlh);
	399	return -EMSGSIZE;
	400	}
	401
	402	static inline size_t rtnl_rtr_nlmsg_size(void)
	403	{
	404	return NLMSG_ALIGN(sizeof(struct br_port_msg))
	405	+ nla_total_size(sizeof(__u32));
	406	}
	407
	408	void br_rtr_notify(struct net_device dev, struct net_bridge_port port,
	409	int type)
	410	{
	411	struct net *net = dev_net(dev);
	412	struct sk_buff *skb;
	413	int err = -ENOBUFS;
	414	int ifindex;
	415
	416	ifindex = port ? port->dev->ifindex : 0;
	417	skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
	418	if (!skb)
	419	goto errout;
	420
	421	err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
	422	if (err < 0) {
	423	kfree_skb(skb);
	424	goto errout;
	425	}
	426
	427	rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
	428	return;
	429
	430	errout:
431	rtnl_set_sk_err(net, RTNLGRP_MDB, err);
432	}
433
cfd56754 CW	434	static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
	435	{
	436	if (entry->ifindex == 0)
	437	return false;
	438
	439	if (entry->addr.proto == htons(ETH_P_IP)) {
	440	if (!ipv4_is_multicast(entry->addr.u.ip4))
	441	return false;
	442	if (ipv4_is_local_multicast(entry->addr.u.ip4))
	443	return false;
	444	#if IS_ENABLED(CONFIG_IPV6)
	445	} else if (entry->addr.proto == htons(ETH_P_IPV6)) {
3c3769e6	446	if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
cfd56754 CW	447	return false;
	448	#endif
	449	} else
	450	return false;
ccb1c31a AW	451	if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
ccb1c31a AW	452	return false;
74fe61f1 NA	453	if (entry->vid >= VLAN_VID_MASK)
74fe61f1 NA	454	return false;
cfd56754 CW	455
	456	return true;
	457	}
	458
	459	static int br_mdb_parse(struct sk_buff skb, struct nlmsghdr nlh,
	460	struct net_device pdev, struct br_mdb_entry pentry)
	461	{
	462	struct net *net = sock_net(skb->sk);
	463	struct br_mdb_entry *entry;
	464	struct br_port_msg *bpm;
	465	struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
	466	struct net_device *dev;
	467	int err;
	468
fceb6435 JB	469	err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL,
fceb6435 JB	470	NULL);
cfd56754 CW	471	if (err < 0)
	472	return err;
	473
	474	bpm = nlmsg_data(nlh);
	475	if (bpm->ifindex == 0) {
	476	pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
	477	return -EINVAL;
	478	}
	479
	480	dev = __dev_get_by_index(net, bpm->ifindex);
	481	if (dev == NULL) {
	482	pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
	483	return -ENODEV;
	484	}
	485
	486	if (!(dev->priv_flags & IFF_EBRIDGE)) {
	487	pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
	488	return -EOPNOTSUPP;
	489	}
	490
	491	*pdev = dev;
	492
	493	if (!tb[MDBA_SET_ENTRY] \|\|
	494	nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
	495	pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
	496	return -EINVAL;
	497	}
	498
	499	entry = nla_data(tb[MDBA_SET_ENTRY]);
	500	if (!is_valid_mdb_entry(entry)) {
	501	pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
	502	return -EINVAL;
	503	}
	504
	505	*pentry = entry;
	506	return 0;
	507	}
	508
	509	static int br_mdb_add_group(struct net_bridge br, struct net_bridge_port port,
45ebcce5	510	struct br_ip *group, unsigned char state)
cfd56754 CW	511	{
	512	struct net_bridge_mdb_entry *mp;
	513	struct net_bridge_port_group *p;
	514	struct net_bridge_port_group __rcu **pp;
	515	struct net_bridge_mdb_htable *mdb;
f7e2965d	516	unsigned long now = jiffies;
cfd56754 CW	517	int err;
	518
	519	mdb = mlock_dereference(br->mdb, br);
	520	mp = br_mdb_ip_get(mdb, group);
	521	if (!mp) {
	522	mp = br_multicast_new_group(br, port, group);
56bb7fd9 AB	523	err = PTR_ERR_OR_ZERO(mp);
56bb7fd9 AB	524	if (err)
cfd56754 CW	525	return err;
	526	}
	527
	528	for (pp = &mp->ports;
	529	(p = mlock_dereference(*pp, br)) != NULL;
	530	pp = &p->next) {
	531	if (p->port == port)
	532	return -EEXIST;
	533	if ((unsigned long)p->port < (unsigned long)port)
	534	break;
	535	}
	536
6db6f0ea	537	p = br_multicast_new_port_group(port, group, *pp, state, NULL);
cfd56754 CW	538	if (unlikely(!p))
	539	return -ENOMEM;
	540	rcu_assign_pointer(*pp, p);
f7e2965d SA	541	if (state == MDB_TEMPORARY)
f7e2965d SA	542	mod_timer(&p->timer, now + br->multicast_membership_interval);
cfd56754	543
cfd56754 CW	544	return 0;
	545	}
	546
	547	static int __br_mdb_add(struct net net, struct net_bridge br,
45ebcce5	548	struct br_mdb_entry *entry)
cfd56754 CW	549	{
	550	struct br_ip ip;
	551	struct net_device *dev;
	552	struct net_bridge_port *p;
	553	int ret;
	554
	555	if (!netif_running(br->dev) \|\| br->multicast_disabled)
	556	return -EINVAL;
	557
	558	dev = __dev_get_by_index(net, entry->ifindex);
	559	if (!dev)
	560	return -ENODEV;
	561
	562	p = br_port_get_rtnl(dev);
	563	if (!p \|\| p->br != br \|\| p->state == BR_STATE_DISABLED)
	564	return -EINVAL;
	565
6dd684c0	566	__mdb_entry_to_br_ip(entry, &ip);
cfd56754 CW	567
cfd56754 CW	568	spin_lock_bh(&br->multicast_lock);
45ebcce5	569	ret = br_mdb_add_group(br, p, &ip, entry->state);
cfd56754 CW	570	spin_unlock_bh(&br->multicast_lock);
	571	return ret;
	572	}
	573
c21ef3e3 DA	574	static int br_mdb_add(struct sk_buff skb, struct nlmsghdr nlh,
c21ef3e3 DA	575	struct netlink_ext_ack *extack)
cfd56754 CW	576	{
cfd56754 CW	577	struct net *net = sock_net(skb->sk);
2594e906	578	struct net_bridge_vlan_group *vg;
e44deb2f	579	struct net_device dev, pdev;
cfd56754	580	struct br_mdb_entry *entry;
e44deb2f	581	struct net_bridge_port *p;
2594e906	582	struct net_bridge_vlan *v;
cfd56754 CW	583	struct net_bridge *br;
	584	int err;
	585
	586	err = br_mdb_parse(skb, nlh, &dev, &entry);
	587	if (err < 0)
	588	return err;
	589
	590	br = netdev_priv(dev);
	591
e44deb2f SA	592	/* If vlan filtering is enabled and VLAN is not specified
	593	* install mdb entry on all vlans configured on the port.
	594	*/
	595	pdev = __dev_get_by_index(net, entry->ifindex);
	596	if (!pdev)
	597	return -ENODEV;
	598
	599	p = br_port_get_rtnl(pdev);
	600	if (!p \|\| p->br != br \|\| p->state == BR_STATE_DISABLED)
	601	return -EINVAL;
	602
2594e906	603	vg = nbp_vlan_group(p);
1f51445a	604	if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
2594e906 NA	605	list_for_each_entry(v, &vg->vlan_list, vlist) {
2594e906 NA	606	entry->vid = v->vid;
45ebcce5	607	err = __br_mdb_add(net, br, entry);
e44deb2f SA	608	if (err)
e44deb2f SA	609	break;
45ebcce5	610	__br_mdb_notify(dev, p, entry, RTM_NEWMDB);
e44deb2f SA	611	}
e44deb2f SA	612	} else {
45ebcce5	613	err = __br_mdb_add(net, br, entry);
e44deb2f	614	if (!err)
45ebcce5	615	__br_mdb_notify(dev, p, entry, RTM_NEWMDB);
e44deb2f SA	616	}
e44deb2f SA	617
cfd56754 CW	618	return err;
	619	}
	620
	621	static int __br_mdb_del(struct net_bridge br, struct br_mdb_entry entry)
	622	{
	623	struct net_bridge_mdb_htable *mdb;
	624	struct net_bridge_mdb_entry *mp;
	625	struct net_bridge_port_group *p;
	626	struct net_bridge_port_group __rcu **pp;
	627	struct br_ip ip;
	628	int err = -EINVAL;
	629
	630	if (!netif_running(br->dev) \|\| br->multicast_disabled)
	631	return -EINVAL;
	632
6dd684c0	633	__mdb_entry_to_br_ip(entry, &ip);
cfd56754 CW	634
	635	spin_lock_bh(&br->multicast_lock);
	636	mdb = mlock_dereference(br->mdb, br);
	637
	638	mp = br_mdb_ip_get(mdb, &ip);
	639	if (!mp)
	640	goto unlock;
	641
	642	for (pp = &mp->ports;
	643	(p = mlock_dereference(*pp, br)) != NULL;
	644	pp = &p->next) {
	645	if (!p->port \|\| p->port->dev->ifindex != entry->ifindex)
	646	continue;
	647
	648	if (p->port->state == BR_STATE_DISABLED)
	649	goto unlock;
	650
9d06b6d8	651	__mdb_entry_fill_flags(entry, p->flags);
cfd56754 CW	652	rcu_assign_pointer(*pp, p->next);
	653	hlist_del_init(&p->mglist);
	654	del_timer(&p->timer);
	655	call_rcu_bh(&p->rcu, br_multicast_free_pg);
	656	err = 0;
	657
454594f3	658	if (!mp->ports && !mp->mglist &&
cfd56754 CW	659	netif_running(br->dev))
	660	mod_timer(&mp->timer, jiffies);
	661	break;
	662	}
	663
	664	unlock:
	665	spin_unlock_bh(&br->multicast_lock);
	666	return err;
	667	}
	668
c21ef3e3 DA	669	static int br_mdb_del(struct sk_buff skb, struct nlmsghdr nlh,
c21ef3e3 DA	670	struct netlink_ext_ack *extack)
cfd56754	671	{
e44deb2f	672	struct net *net = sock_net(skb->sk);
2594e906	673	struct net_bridge_vlan_group *vg;
e44deb2f	674	struct net_device dev, pdev;
cfd56754	675	struct br_mdb_entry *entry;
e44deb2f	676	struct net_bridge_port *p;
2594e906	677	struct net_bridge_vlan *v;
cfd56754 CW	678	struct net_bridge *br;
	679	int err;
	680
	681	err = br_mdb_parse(skb, nlh, &dev, &entry);
	682	if (err < 0)
	683	return err;
	684
	685	br = netdev_priv(dev);
	686
e44deb2f SA	687	/* If vlan filtering is enabled and VLAN is not specified
	688	* delete mdb entry on all vlans configured on the port.
	689	*/
	690	pdev = __dev_get_by_index(net, entry->ifindex);
	691	if (!pdev)
	692	return -ENODEV;
	693
	694	p = br_port_get_rtnl(pdev);
	695	if (!p \|\| p->br != br \|\| p->state == BR_STATE_DISABLED)
	696	return -EINVAL;
	697
2594e906	698	vg = nbp_vlan_group(p);
1f51445a	699	if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
2594e906 NA	700	list_for_each_entry(v, &vg->vlan_list, vlist) {
2594e906 NA	701	entry->vid = v->vid;
e44deb2f SA	702	err = __br_mdb_del(br, entry);
e44deb2f SA	703	if (!err)
45ebcce5	704	__br_mdb_notify(dev, p, entry, RTM_DELMDB);
e44deb2f SA	705	}
	706	} else {
	707	err = __br_mdb_del(br, entry);
	708	if (!err)
45ebcce5	709	__br_mdb_notify(dev, p, entry, RTM_DELMDB);
e44deb2f SA	710	}
e44deb2f SA	711
cfd56754 CW	712	return err;
	713	}
	714
ee07c6e7 CW	715	void br_mdb_init(void)
ee07c6e7 CW	716	{
b97bac64 FW	717	rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0);
	718	rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0);
	719	rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0);
ee07c6e7	720	}
63233159 VY	721
	722	void br_mdb_uninit(void)
	723	{
	724	rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
	725	rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
	726	rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
	727	}