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

#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>
#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;

	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 && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex))
			goto fail;
	}

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

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) {
				port = p->port;
				if (port) {
					struct br_mdb_entry e;
					memset(&e, 0, sizeof(e));
					e.ifindex = port->dev->ifindex;
					e.state = p->state;
					e.vid = p->addr.vid;
					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;
					if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
						nla_nest_cancel(skb, nest2);
						err = -EMSGSIZE;
						goto out;
					}
				}
			}
			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));
}

static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
			    int type)
{
	struct net *net = dev_net(dev);
	struct sk_buff *skb;
	int err = -ENOBUFS;

	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 state)
{
	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.state = state;
	entry.vid = group->vid;
	__br_mdb_notify(dev, &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);
	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(mp);
		if (IS_ERR(mp))
			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);
	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;

	memset(&ip, 0, sizeof(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

	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 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) && 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, entry, RTM_NEWMDB);
		}
	} else {
		err = __br_mdb_add(net, br, entry);
		if (!err)
			__br_mdb_notify(dev, 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;

	memset(&ip, 0, sizeof(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

	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;

		entry->state = p->state;
		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 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) && 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, entry, RTM_DELMDB);
		}
	} else {
		err = __br_mdb_del(br, entry);
		if (!err)
			__br_mdb_notify(dev, entry, RTM_DELMDB);
	}

	return err;
}

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

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
ee07c6e7 CW	1	#include <linux/err.h>
	2	#include <linux/igmp.h>
	3	#include <linux/kernel.h>
	4	#include <linux/netdevice.h>
	5	#include <linux/rculist.h>
	6	#include <linux/skbuff.h>
cfd56754	7	#include <linux/if_ether.h>
ee07c6e7 CW	8	#include <net/ip.h>
	9	#include <net/netlink.h>
	10	#if IS_ENABLED(CONFIG_IPV6)
	11	#include <net/ipv6.h>
3c3769e6	12	#include <net/addrconf.h>
ee07c6e7 CW	13	#endif
	14
	15	#include "br_private.h"
	16
	17	static int br_rports_fill_info(struct sk_buff skb, struct netlink_callback cb,
	18	struct net_device *dev)
	19	{
	20	struct net_bridge *br = netdev_priv(dev);
	21	struct net_bridge_port *p;
ee07c6e7 CW	22	struct nlattr *nest;
	23
	24	if (!br->multicast_router \|\| hlist_empty(&br->router_list))
	25	return 0;
	26
	27	nest = nla_nest_start(skb, MDBA_ROUTER);
	28	if (nest == NULL)
	29	return -EMSGSIZE;
	30
b67bfe0d	31	hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
ee07c6e7 CW	32	if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex))
	33	goto fail;
	34	}
	35
	36	nla_nest_end(skb, nest);
	37	return 0;
	38	fail:
	39	nla_nest_cancel(skb, nest);
	40	return -EMSGSIZE;
	41	}
	42
	43	static int br_mdb_fill_info(struct sk_buff skb, struct netlink_callback cb,
	44	struct net_device *dev)
	45	{
	46	struct net_bridge *br = netdev_priv(dev);
	47	struct net_bridge_mdb_htable *mdb;
	48	struct nlattr nest, nest2;
	49	int i, err = 0;
	50	int idx = 0, s_idx = cb->args[1];
	51
	52	if (br->multicast_disabled)
	53	return 0;
	54
	55	mdb = rcu_dereference(br->mdb);
	56	if (!mdb)
	57	return 0;
	58
	59	nest = nla_nest_start(skb, MDBA_MDB);
	60	if (nest == NULL)
	61	return -EMSGSIZE;
	62
	63	for (i = 0; i < mdb->max; i++) {
ee07c6e7	64	struct net_bridge_mdb_entry *mp;
762a3d89	65	struct net_bridge_port_group *p;
762a3d89	66	struct net_bridge_port_group __rcu **pp;
ee07c6e7 CW	67	struct net_bridge_port *port;
ee07c6e7 CW	68
b67bfe0d	69	hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
ee07c6e7 CW	70	if (idx < s_idx)
	71	goto skip;
	72
	73	nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
	74	if (nest2 == NULL) {
	75	err = -EMSGSIZE;
	76	goto out;
	77	}
	78
	79	for (pp = &mp->ports;
	80	(p = rcu_dereference(*pp)) != NULL;
	81	pp = &p->next) {
	82	port = p->port;
	83	if (port) {
	84	struct br_mdb_entry e;
c085c499	85	memset(&e, 0, sizeof(e));
ee07c6e7	86	e.ifindex = port->dev->ifindex;
ccb1c31a	87	e.state = p->state;
74fe61f1	88	e.vid = p->addr.vid;
09d7cf7d VY	89	if (p->addr.proto == htons(ETH_P_IP))
09d7cf7d VY	90	e.addr.u.ip4 = p->addr.u.ip4;
ee07c6e7	91	#if IS_ENABLED(CONFIG_IPV6)
09d7cf7d VY	92	if (p->addr.proto == htons(ETH_P_IPV6))
09d7cf7d VY	93	e.addr.u.ip6 = p->addr.u.ip6;
ee07c6e7 CW	94	#endif
	95	e.addr.proto = p->addr.proto;
	96	if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
	97	nla_nest_cancel(skb, nest2);
	98	err = -EMSGSIZE;
	99	goto out;
	100	}
	101	}
	102	}
	103	nla_nest_end(skb, nest2);
	104	skip:
	105	idx++;
	106	}
	107	}
	108
	109	out:
	110	cb->args[1] = idx;
	111	nla_nest_end(skb, nest);
	112	return err;
	113	}
	114
	115	static int br_mdb_dump(struct sk_buff skb, struct netlink_callback cb)
	116	{
	117	struct net_device *dev;
	118	struct net *net = sock_net(skb->sk);
	119	struct nlmsghdr *nlh = NULL;
	120	int idx = 0, s_idx;
	121
	122	s_idx = cb->args[0];
	123
	124	rcu_read_lock();
	125
2ce297fc CW	126	/* In theory this could be wrapped to 0... */
2ce297fc CW	127	cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
ee07c6e7 CW	128
	129	for_each_netdev_rcu(net, dev) {
	130	if (dev->priv_flags & IFF_EBRIDGE) {
	131	struct br_port_msg *bpm;
	132
	133	if (idx < s_idx)
	134	goto skip;
	135
	136	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
	137	cb->nlh->nlmsg_seq, RTM_GETMDB,
	138	sizeof(*bpm), NLM_F_MULTI);
	139	if (nlh == NULL)
	140	break;
	141
	142	bpm = nlmsg_data(nlh);
c085c499	143	memset(bpm, 0, sizeof(*bpm));
ee07c6e7 CW	144	bpm->ifindex = dev->ifindex;
	145	if (br_mdb_fill_info(skb, cb, dev) < 0)
	146	goto out;
	147	if (br_rports_fill_info(skb, cb, dev) < 0)
	148	goto out;
	149
	150	cb->args[1] = 0;
	151	nlmsg_end(skb, nlh);
	152	skip:
	153	idx++;
	154	}
	155	}
	156
	157	out:
	158	if (nlh)
	159	nlmsg_end(skb, nlh);
	160	rcu_read_unlock();
	161	cb->args[0] = idx;
	162	return skb->len;
	163	}
	164
37a393bc CW	165	static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
	166	struct net_device *dev,
	167	struct br_mdb_entry *entry, u32 pid,
	168	u32 seq, int type, unsigned int flags)
	169	{
	170	struct nlmsghdr *nlh;
	171	struct br_port_msg *bpm;
	172	struct nlattr nest, nest2;
	173
82199679	174	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
37a393bc CW	175	if (!nlh)
	176	return -EMSGSIZE;
	177
	178	bpm = nlmsg_data(nlh);
c085c499	179	memset(bpm, 0, sizeof(*bpm));
37a393bc CW	180	bpm->family = AF_BRIDGE;
	181	bpm->ifindex = dev->ifindex;
	182	nest = nla_nest_start(skb, MDBA_MDB);
	183	if (nest == NULL)
	184	goto cancel;
	185	nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
	186	if (nest2 == NULL)
	187	goto end;
	188
	189	if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
	190	goto end;
	191
	192	nla_nest_end(skb, nest2);
	193	nla_nest_end(skb, nest);
053c095a JB	194	nlmsg_end(skb, nlh);
053c095a JB	195	return 0;
37a393bc CW	196
	197	end:
	198	nla_nest_end(skb, nest);
	199	cancel:
	200	nlmsg_cancel(skb, nlh);
	201	return -EMSGSIZE;
	202	}
	203
	204	static inline size_t rtnl_mdb_nlmsg_size(void)
	205	{
	206	return NLMSG_ALIGN(sizeof(struct br_port_msg))
	207	+ nla_total_size(sizeof(struct br_mdb_entry));
	208	}
	209
	210	static void __br_mdb_notify(struct net_device dev, struct br_mdb_entry entry,
	211	int type)
	212	{
	213	struct net *net = dev_net(dev);
	214	struct sk_buff *skb;
	215	int err = -ENOBUFS;
	216
	217	skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
	218	if (!skb)
	219	goto errout;
	220
	221	err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
	222	if (err < 0) {
	223	kfree_skb(skb);
	224	goto errout;
	225	}
	226
	227	rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
	228	return;
	229	errout:
	230	rtnl_set_sk_err(net, RTNLGRP_MDB, err);
	231	}
	232
	233	void br_mdb_notify(struct net_device dev, struct net_bridge_port port,
09cf0211	234	struct br_ip *group, int type, u8 state)
37a393bc CW	235	{
	236	struct br_mdb_entry entry;
	237
c085c499	238	memset(&entry, 0, sizeof(entry));
37a393bc CW	239	entry.ifindex = port->dev->ifindex;
	240	entry.addr.proto = group->proto;
	241	entry.addr.u.ip4 = group->u.ip4;
	242	#if IS_ENABLED(CONFIG_IPV6)
	243	entry.addr.u.ip6 = group->u.ip6;
	244	#endif
09cf0211	245	entry.state = state;
74fe61f1	246	entry.vid = group->vid;
37a393bc CW	247	__br_mdb_notify(dev, &entry, type);
	248	}
	249
949f1e39 SA	250	static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
	251	struct net_device *dev,
	252	int ifindex, u32 pid,
	253	u32 seq, int type, unsigned int flags)
	254	{
	255	struct br_port_msg *bpm;
	256	struct nlmsghdr *nlh;
	257	struct nlattr *nest;
	258
	259	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
	260	if (!nlh)
	261	return -EMSGSIZE;
	262
	263	bpm = nlmsg_data(nlh);
	264	memset(bpm, 0, sizeof(*bpm));
	265	bpm->family = AF_BRIDGE;
	266	bpm->ifindex = dev->ifindex;
	267	nest = nla_nest_start(skb, MDBA_ROUTER);
	268	if (!nest)
	269	goto cancel;
	270
	271	if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
	272	goto end;
	273
	274	nla_nest_end(skb, nest);
	275	nlmsg_end(skb, nlh);
	276	return 0;
	277
	278	end:
	279	nla_nest_end(skb, nest);
	280	cancel:
	281	nlmsg_cancel(skb, nlh);
	282	return -EMSGSIZE;
	283	}
	284
	285	static inline size_t rtnl_rtr_nlmsg_size(void)
	286	{
	287	return NLMSG_ALIGN(sizeof(struct br_port_msg))
	288	+ nla_total_size(sizeof(__u32));
	289	}
	290
	291	void br_rtr_notify(struct net_device dev, struct net_bridge_port port,
	292	int type)
	293	{
	294	struct net *net = dev_net(dev);
	295	struct sk_buff *skb;
	296	int err = -ENOBUFS;
	297	int ifindex;
	298
	299	ifindex = port ? port->dev->ifindex : 0;
	300	skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
	301	if (!skb)
	302	goto errout;
	303
	304	err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
	305	if (err < 0) {
	306	kfree_skb(skb);
	307	goto errout;
	308	}
	309
	310	rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
	311	return;
	312
	313	errout:
314	rtnl_set_sk_err(net, RTNLGRP_MDB, err);
315	}
316
cfd56754 CW	317	static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
	318	{
	319	if (entry->ifindex == 0)
	320	return false;
	321
	322	if (entry->addr.proto == htons(ETH_P_IP)) {
	323	if (!ipv4_is_multicast(entry->addr.u.ip4))
	324	return false;
	325	if (ipv4_is_local_multicast(entry->addr.u.ip4))
	326	return false;
	327	#if IS_ENABLED(CONFIG_IPV6)
	328	} else if (entry->addr.proto == htons(ETH_P_IPV6)) {
3c3769e6	329	if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
cfd56754 CW	330	return false;
	331	#endif
	332	} else
	333	return false;
ccb1c31a AW	334	if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
ccb1c31a AW	335	return false;
74fe61f1 NA	336	if (entry->vid >= VLAN_VID_MASK)
74fe61f1 NA	337	return false;
cfd56754 CW	338
	339	return true;
	340	}
	341
	342	static int br_mdb_parse(struct sk_buff skb, struct nlmsghdr nlh,
	343	struct net_device pdev, struct br_mdb_entry pentry)
	344	{
	345	struct net *net = sock_net(skb->sk);
	346	struct br_mdb_entry *entry;
	347	struct br_port_msg *bpm;
	348	struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
	349	struct net_device *dev;
	350	int err;
	351
12d87251	352	err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL);
cfd56754 CW	353	if (err < 0)
	354	return err;
	355
	356	bpm = nlmsg_data(nlh);
	357	if (bpm->ifindex == 0) {
	358	pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
	359	return -EINVAL;
	360	}
	361
	362	dev = __dev_get_by_index(net, bpm->ifindex);
	363	if (dev == NULL) {
	364	pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
	365	return -ENODEV;
	366	}
	367
	368	if (!(dev->priv_flags & IFF_EBRIDGE)) {
	369	pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
	370	return -EOPNOTSUPP;
	371	}
	372
	373	*pdev = dev;
	374
	375	if (!tb[MDBA_SET_ENTRY] \|\|
	376	nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
	377	pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
	378	return -EINVAL;
	379	}
	380
	381	entry = nla_data(tb[MDBA_SET_ENTRY]);
	382	if (!is_valid_mdb_entry(entry)) {
	383	pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
	384	return -EINVAL;
	385	}
	386
	387	*pentry = entry;
	388	return 0;
	389	}
	390
	391	static int br_mdb_add_group(struct net_bridge br, struct net_bridge_port port,
ccb1c31a	392	struct br_ip *group, unsigned char state)
cfd56754 CW	393	{
	394	struct net_bridge_mdb_entry *mp;
	395	struct net_bridge_port_group *p;
	396	struct net_bridge_port_group __rcu **pp;
	397	struct net_bridge_mdb_htable *mdb;
f7e2965d	398	unsigned long now = jiffies;
cfd56754 CW	399	int err;
	400
	401	mdb = mlock_dereference(br->mdb, br);
	402	mp = br_mdb_ip_get(mdb, group);
	403	if (!mp) {
	404	mp = br_multicast_new_group(br, port, group);
	405	err = PTR_ERR(mp);
	406	if (IS_ERR(mp))
	407	return err;
	408	}
	409
	410	for (pp = &mp->ports;
	411	(p = mlock_dereference(*pp, br)) != NULL;
	412	pp = &p->next) {
	413	if (p->port == port)
	414	return -EEXIST;
	415	if ((unsigned long)p->port < (unsigned long)port)
	416	break;
	417	}
	418
ccb1c31a	419	p = br_multicast_new_port_group(port, group, *pp, state);
cfd56754 CW	420	if (unlikely(!p))
	421	return -ENOMEM;
	422	rcu_assign_pointer(*pp, p);
f7e2965d SA	423	if (state == MDB_TEMPORARY)
f7e2965d SA	424	mod_timer(&p->timer, now + br->multicast_membership_interval);
cfd56754	425
cfd56754 CW	426	return 0;
	427	}
	428
	429	static int __br_mdb_add(struct net net, struct net_bridge br,
	430	struct br_mdb_entry *entry)
	431	{
	432	struct br_ip ip;
	433	struct net_device *dev;
	434	struct net_bridge_port *p;
	435	int ret;
	436
	437	if (!netif_running(br->dev) \|\| br->multicast_disabled)
	438	return -EINVAL;
	439
	440	dev = __dev_get_by_index(net, entry->ifindex);
	441	if (!dev)
	442	return -ENODEV;
	443
	444	p = br_port_get_rtnl(dev);
	445	if (!p \|\| p->br != br \|\| p->state == BR_STATE_DISABLED)
	446	return -EINVAL;
	447
f1158b74	448	memset(&ip, 0, sizeof(ip));
74fe61f1	449	ip.vid = entry->vid;
cfd56754 CW	450	ip.proto = entry->addr.proto;
	451	if (ip.proto == htons(ETH_P_IP))
	452	ip.u.ip4 = entry->addr.u.ip4;
	453	#if IS_ENABLED(CONFIG_IPV6)
	454	else
	455	ip.u.ip6 = entry->addr.u.ip6;
	456	#endif
	457
	458	spin_lock_bh(&br->multicast_lock);
ccb1c31a	459	ret = br_mdb_add_group(br, p, &ip, entry->state);
cfd56754 CW	460	spin_unlock_bh(&br->multicast_lock);
	461	return ret;
	462	}
	463
661d2967	464	static int br_mdb_add(struct sk_buff skb, struct nlmsghdr nlh)
cfd56754 CW	465	{
cfd56754 CW	466	struct net *net = sock_net(skb->sk);
2594e906	467	struct net_bridge_vlan_group *vg;
e44deb2f	468	struct net_device dev, pdev;
cfd56754	469	struct br_mdb_entry *entry;
e44deb2f	470	struct net_bridge_port *p;
2594e906	471	struct net_bridge_vlan *v;
cfd56754 CW	472	struct net_bridge *br;
	473	int err;
	474
	475	err = br_mdb_parse(skb, nlh, &dev, &entry);
	476	if (err < 0)
	477	return err;
	478
	479	br = netdev_priv(dev);
	480
e44deb2f SA	481	/* If vlan filtering is enabled and VLAN is not specified
	482	* install mdb entry on all vlans configured on the port.
	483	*/
	484	pdev = __dev_get_by_index(net, entry->ifindex);
	485	if (!pdev)
	486	return -ENODEV;
	487
	488	p = br_port_get_rtnl(pdev);
	489	if (!p \|\| p->br != br \|\| p->state == BR_STATE_DISABLED)
	490	return -EINVAL;
	491
2594e906 NA	492	vg = nbp_vlan_group(p);
	493	if (br_vlan_enabled(br) && vg && entry->vid == 0) {
	494	list_for_each_entry(v, &vg->vlan_list, vlist) {
	495	entry->vid = v->vid;
e44deb2f SA	496	err = __br_mdb_add(net, br, entry);
	497	if (err)
	498	break;
	499	__br_mdb_notify(dev, entry, RTM_NEWMDB);
	500	}
	501	} else {
	502	err = __br_mdb_add(net, br, entry);
	503	if (!err)
	504	__br_mdb_notify(dev, entry, RTM_NEWMDB);
	505	}
	506
cfd56754 CW	507	return err;
	508	}
	509
	510	static int __br_mdb_del(struct net_bridge br, struct br_mdb_entry entry)
	511	{
	512	struct net_bridge_mdb_htable *mdb;
	513	struct net_bridge_mdb_entry *mp;
	514	struct net_bridge_port_group *p;
	515	struct net_bridge_port_group __rcu **pp;
	516	struct br_ip ip;
	517	int err = -EINVAL;
	518
	519	if (!netif_running(br->dev) \|\| br->multicast_disabled)
	520	return -EINVAL;
	521
f1158b74	522	memset(&ip, 0, sizeof(ip));
74fe61f1	523	ip.vid = entry->vid;
cfd56754	524	ip.proto = entry->addr.proto;
51ed7f3e	525	if (ip.proto == htons(ETH_P_IP))
cfd56754 CW	526	ip.u.ip4 = entry->addr.u.ip4;
cfd56754 CW	527	#if IS_ENABLED(CONFIG_IPV6)
51ed7f3e	528	else
cfd56754 CW	529	ip.u.ip6 = entry->addr.u.ip6;
	530	#endif
	531
	532	spin_lock_bh(&br->multicast_lock);
	533	mdb = mlock_dereference(br->mdb, br);
	534
	535	mp = br_mdb_ip_get(mdb, &ip);
	536	if (!mp)
	537	goto unlock;
	538
	539	for (pp = &mp->ports;
	540	(p = mlock_dereference(*pp, br)) != NULL;
	541	pp = &p->next) {
	542	if (!p->port \|\| p->port->dev->ifindex != entry->ifindex)
	543	continue;
	544
	545	if (p->port->state == BR_STATE_DISABLED)
	546	goto unlock;
	547
7ae90a4f	548	entry->state = p->state;
cfd56754 CW	549	rcu_assign_pointer(*pp, p->next);
	550	hlist_del_init(&p->mglist);
	551	del_timer(&p->timer);
	552	call_rcu_bh(&p->rcu, br_multicast_free_pg);
	553	err = 0;
	554
454594f3	555	if (!mp->ports && !mp->mglist &&
cfd56754 CW	556	netif_running(br->dev))
	557	mod_timer(&mp->timer, jiffies);
	558	break;
	559	}
	560
	561	unlock:
	562	spin_unlock_bh(&br->multicast_lock);
	563	return err;
	564	}
	565
661d2967	566	static int br_mdb_del(struct sk_buff skb, struct nlmsghdr nlh)
cfd56754	567	{
e44deb2f	568	struct net *net = sock_net(skb->sk);
2594e906	569	struct net_bridge_vlan_group *vg;
e44deb2f	570	struct net_device dev, pdev;
cfd56754	571	struct br_mdb_entry *entry;
e44deb2f	572	struct net_bridge_port *p;
2594e906	573	struct net_bridge_vlan *v;
cfd56754 CW	574	struct net_bridge *br;
	575	int err;
	576
	577	err = br_mdb_parse(skb, nlh, &dev, &entry);
	578	if (err < 0)
	579	return err;
	580
	581	br = netdev_priv(dev);
	582
e44deb2f SA	583	/* If vlan filtering is enabled and VLAN is not specified
	584	* delete mdb entry on all vlans configured on the port.
	585	*/
	586	pdev = __dev_get_by_index(net, entry->ifindex);
	587	if (!pdev)
	588	return -ENODEV;
	589
	590	p = br_port_get_rtnl(pdev);
	591	if (!p \|\| p->br != br \|\| p->state == BR_STATE_DISABLED)
	592	return -EINVAL;
	593
2594e906 NA	594	vg = nbp_vlan_group(p);
	595	if (br_vlan_enabled(br) && vg && entry->vid == 0) {
	596	list_for_each_entry(v, &vg->vlan_list, vlist) {
	597	entry->vid = v->vid;
e44deb2f SA	598	err = __br_mdb_del(br, entry);
	599	if (!err)
	600	__br_mdb_notify(dev, entry, RTM_DELMDB);
	601	}
	602	} else {
	603	err = __br_mdb_del(br, entry);
	604	if (!err)
	605	__br_mdb_notify(dev, entry, RTM_DELMDB);
	606	}
	607
cfd56754 CW	608	return err;
	609	}
	610
ee07c6e7 CW	611	void br_mdb_init(void)
	612	{
	613	rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
cfd56754 CW	614	rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
cfd56754 CW	615	rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
ee07c6e7	616	}
63233159 VY	617
	618	void br_mdb_uninit(void)
	619	{
	620	rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
	621	rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
	622	rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
	623	}