path: root/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->ip4_mc_router_list))
		return 0;

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

	hlist_for_each_entry_rcu(p, &br->ip4_mc_router_list, ip4_rlist) {
		if (!p)
			continue;
		port_nest = nla_nest_start_noflag(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->ip4_mc_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;
	if (flags & MDB_PG_FLAGS_FAST_LEAVE)
		e->flags |= MDB_FLAGS_FAST_LEAVE;
	if (flags & MDB_PG_FLAGS_STAR_EXCL)
		e->flags |= MDB_FLAGS_STAR_EXCL;
	if (flags & MDB_PG_FLAGS_BLOCKED)
		e->flags |= MDB_FLAGS_BLOCKED;
}

static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip,
				 struct nlattr **mdb_attrs)
{
	memset(ip, 0, sizeof(struct br_ip));
	ip->vid = entry->vid;
	ip->proto = entry->addr.proto;
	switch (ip->proto) {
	case htons(ETH_P_IP):
		ip->dst.ip4 = entry->addr.u.ip4;
		if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE])
			ip->src.ip4 = nla_get_in_addr(mdb_attrs[MDBE_ATTR_SOURCE]);
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case htons(ETH_P_IPV6):
		ip->dst.ip6 = entry->addr.u.ip6;
		if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE])
			ip->src.ip6 = nla_get_in6_addr(mdb_attrs[MDBE_ATTR_SOURCE]);
		break;
#endif
	default:
		ether_addr_copy(ip->