[linux-2.6-block.git] / net / bridge / br_forward.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	Forwarding decision
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 */

#include <linux/err.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/netpoll.h>
#include <linux/skbuff.h>
#include <linux/if_vlan.h>
#include <linux/netfilter_bridge.h>
#include "br_private.h"

/* Don't forward packets to originating port or forwarding disabled */
static inline int should_deliver(const struct net_bridge_port *p,
				 const struct sk_buff *skb)
{
	struct net_bridge_vlan_group *vg;

	vg = nbp_vlan_group_rcu(p);
	return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) &&
		(br_mst_is_enabled(p->br) || p->state == BR_STATE_FORWARDING) &&
		br_allowed_egress(vg, skb) && nbp_switchdev_allowed_egress(p, skb) &&
		!br_skb_isolated(p, skb);
}

int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	skb_push(skb, ETH_HLEN);
	if (!is_skb_forwardable(skb->dev, skb))
		goto drop;

	br_drop_fake_rtable(skb);

	if (skb->ip_summed == CHECKSUM_PARTIAL &&
	    eth_type_vlan(skb->protocol)) {
		int depth;

		if (!vlan_get_protocol_and_depth(skb, skb->protocol, &depth))
			goto drop;

		skb_set_network_header(skb, depth);
	}

	br_switchdev_frame_set_offload_fwd_mark(skb);

	dev_queue_xmit(skb);

	return 0;

drop:
	kfree_skb(skb);
	return 0;
}
EXPORT_SYMBOL_GPL(br_dev_queue_push_xmit);

int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	skb_clear_tstamp(skb);
	return NF_HOOK(NFPROTO_BRIDGE, NF_BR_POST_ROUTING,
		       net, sk, skb, NULL, skb->dev,
		       br_dev_queue_push_xmit);

}
EXPORT_SYMBOL_GPL(br_forward_finish);

static void __br_forward(const struct net_bridge_port *to,
			 struct sk_buff *skb, bool local_orig)
{
	struct net_bridge_vlan_group *vg;
	struct net_device *indev;
	struct net *net;
	int br_hook;

	/* Mark the skb for forwarding offload early so that br_handle_vlan()
	 * can know whether to pop the VLAN header on egress or keep it.
	 */
	nbp_switchdev_frame_mark_tx_fwd_offload(to, skb);

	vg = nbp_vlan_group_rcu(to);
	skb = br_handle_vlan(to->br, to, vg, skb);
	if (!skb)
		return;

	indev = skb->dev;
	skb->dev = to->dev;
	if (!local_orig) {
		if (skb_warn_if_lro(skb)) {
			kfree_skb(skb);
			return;
		}
		br_hook = NF_BR_FORWARD;
		skb_forward_csum(skb);
		net = dev_net(indev);
	} else {
		if (unlikely(netpoll_tx_running(to->br->dev))) {
			skb_push(skb, ETH_HLEN);
			if (!is_skb_forwardable(skb->dev, skb))
				kfree_skb(skb);
			else
				br_netpoll_send_skb(to, skb);
			return;
		}
		br_hook = NF_BR_LOCAL_OUT;
		net = dev_net(skb->dev);
		indev = NULL;
	}

	NF_HOOK(NFPROTO_BRIDGE, br_hook,
		net, NULL, skb, indev, skb->dev,
		br_forward_finish);
}

static int deliver_clone(const struct net_bridge_port *prev,
			 struct sk_buff *skb, bool local_orig)
{
	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;

	skb = skb_clone(skb, GFP_ATOMIC);
	if (!skb) {
		DEV_STATS_INC(dev, tx_dropped);
		return -ENOMEM;
	}

	__br_forward(prev, skb, local_orig);
	return 0;
}

/**
 * br_forward - forward a packet to a specific port
 * @to: destination port
 * @skb: packet being forwarded
 * @local_rcv: packet will be received locally after forwarding
 * @local_orig: packet is locally originated
 *
 * Should be called with rcu_read_lock.
 */
void br_forward(const struct net_bridge_port *to,
		struct sk_buff *skb, bool local_rcv, bool local_orig)
{
	if (unlikely(!to))
		goto out;

	/* redirect to backup link if the destination port is down */
	if (rcu_access_pointer(to->backup_port) && !netif_carrier_ok(to->dev)) {
		struct net_bridge_port *backup_port;

		backup_port = rcu_dereference(to->backup_port);
		if (unlikely(!backup_port))
			goto out;
		BR_INPUT_SKB_CB(skb)->backup_nhid = READ_ONCE(to->backup_nhid);
		to = backup_port;
	}

	if (should_deliver(to, skb)) {
		if (local_rcv)
			deliver_clone(to, skb, local_orig);
		else
			__br_forward(to, skb, local_orig);
		return;
	}

out:
	if (!local_rcv)
		kfree_skb(skb);
}
EXPORT_SYMBOL_GPL(br_forward);

static struct net_bridge_port *maybe_deliver(
	struct net_bridge_port *prev, struct net_bridge_port *p,
	struct sk_buff *skb, bool local_orig)
{
	u8 igmp_type = br_multicast_igmp_type(skb);
	int err;

	if (!should_deliver(p, skb))
		return prev;

	nbp_switchdev_frame_mark_tx_fwd_to_hwdom(p, skb);

	if (!prev)
		goto out;

	err = deliver_clone(prev, skb, local_orig);
	if (err)
		return ERR_PTR(err);
out:
	br_multicast_count(p->br, p, skb, igmp_type, BR_MCAST_DIR_TX);

	return p;
}

/* called under rcu_read_lock */
void br_flood(struct net_bridge *br, struct sk_buff *skb,
	      enum br_pkt_type pkt_type, bool local_rcv, bool local_orig,
	      u16 vid)
{
	enum skb_drop_reason reason = SKB_DROP_REASON_NO_TX_TARGET;
	struct net_bridge_port *prev = NULL;
	struct net_bridge_port *p;

	br_tc_skb_miss_set(skb, pkt_type != BR_PKT_BROADCAST);

	list_for_each_entry_rcu(p, &br->port_list, list) {
		/* Do not flood unicast traffic to ports that turn it off, nor
		 * other traffic if flood off, except for traffic we originate
		 */
		switch (pkt_type) {
		case BR_PKT_UNICAST:
			if (!(p->flags & BR_FLOOD))
				continue;
			break;
		case BR_PKT_MULTICAST:
			if (!(p->flags & BR_MCAST_FLOOD) && skb->dev != br->dev)
				continue;
			break;
		case BR_PKT_BROADCAST:
			if (!(p->flags & BR_BCAST_FLOOD) && skb->dev != br->dev)
				continue;
			break;
		}

		/* Do not flood to ports that enable proxy ARP */
		if (p->flags & BR_PROXYARP)
			continue;
		if (BR_INPUT_SKB_CB(skb)->proxyarp_replied &&
		    ((p->flags & BR_PROXYARP_WIFI) ||
		     br_is_neigh_suppress_enabled(p, vid)))
			continue;

		prev = maybe_deliver(prev, p, skb, local_orig);
		if (IS_ERR(prev)) {
			reason = PTR_ERR(prev) == -ENOMEM ? SKB_DROP_REASON_NOMEM :
				 SKB_DROP_REASON_NOT_SPECIFIED;
			goto out;
		}
	}

	if (!prev)
		goto out;

	if (local_rcv)
		deliver_clone(prev, skb, local_orig);
	else
		__br_forward(prev, skb, local_orig);
	return;

out:
	if (!local_rcv)
		kfree_skb_reason(skb, reason);
}

#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb,
			       const unsigned char *addr, bool local_orig)
{
	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
	const unsigned char *src = eth_hdr(skb)->h_source;
	struct sk_buff *nskb;

	if (!should_deliver(p, skb))
		return;

	/* Even with hairpin, no soliloquies - prevent breaking IPv6 DAD */
	if (skb->dev == p->dev && ether_addr_equal(src, addr))
		return;

	__skb_push(skb, ETH_HLEN);
	nskb = pskb_copy(skb, GFP_ATOMIC);
	__skb_pull(skb, ETH_HLEN);
	if (!nskb) {
		DEV_STATS_INC(dev, tx_dropped);
		return;
	}

	skb = nskb;
	__skb_pull(skb, ETH_HLEN);
	if (!is_broadcast_ether_addr(addr))
		memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);

	__br_forward(p, skb, local_orig);
}

/* called with rcu_read_lock */
void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
			struct sk_buff *skb,
			struct net_bridge_mcast *brmctx,
			bool local_rcv, bool local_orig)
{
	enum skb_drop_reason reason = SKB_DROP_REASON_NO_TX_TARGET;
	struct net_bridge_port *prev = NULL;
	struct net_bridge_port_group *p;
	bool allow_mode_include = true;
	struct hlist_node *rp;

	rp = br_multicast_get_first_rport_node(brmctx, skb);

	if (mdst) {
		p = rcu_dereference(mdst->ports);
		if (br_multicast_should_handle_mode(brmctx, mdst->addr.proto) &&
		    br_multicast_is_star_g(&mdst->addr))
			allow_mode_include = false;
	} else {
		p = NULL;
		br_tc_skb_miss_set(skb, true);
	}

	while (p || rp) {
		struct net_bridge_port *port, *lport, *rport;

		lport = p ? p->key.port : NULL;
		rport = br_multicast_rport_from_node_skb(rp, skb);

		if ((unsigned long)lport > (unsigned long)rport) {
			port = lport;

			if (port->flags & BR_MULTICAST_TO_UNICAST) {
				maybe_deliver_addr(lport, skb, p->eth_addr,
						   local_orig);
				goto delivered;
			}
			if ((!allow_mode_include &&
			     p->filter_mode == MCAST_INCLUDE) ||
			    (p->flags & MDB_PG_FLAGS_BLOCKED))
				goto delivered;
		} else {
			port = rport;
		}

		prev = maybe_deliver(prev, port, skb, local_orig);
		if (IS_ERR(prev)) {
			reason = PTR_ERR(prev) == -ENOMEM ? SKB_DROP_REASON_NOMEM :
				 SKB_DROP_REASON_NOT_SPECIFIED;
			goto out;
		}
delivered:
		if ((unsigned long)lport >= (unsigned long)port)
			p = rcu_dereference(p->next);
		if ((unsigned long)rport >= (unsigned long)port)
			rp = rcu_dereference(hlist_next_rcu(rp));
	}

	if (!prev)
		goto out;

	if (local_rcv)
		deliver_clone(prev, skb, local_orig);
	else
		__br_forward(prev, skb, local_orig);
	return;

out:
	if (!local_rcv)
		kfree_skb_reason(skb, reason);
}
#endif
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* Forwarding decision
	4	* Linux ethernet bridge
	5	*
	6	* Authors:
	7	* Lennert Buytenhek <buytenh@gnu.org>
1da177e4 LT	8	*/
1da177e4 LT	9
025d89c2	10	#include <linux/err.h>
5a0e3ad6	11	#include <linux/slab.h>
1da177e4 LT	12	#include <linux/kernel.h>
1da177e4 LT	13	#include <linux/netdevice.h>
c06ee961	14	#include <linux/netpoll.h>
1da177e4	15	#include <linux/skbuff.h>
85ca719e	16	#include <linux/if_vlan.h>
1da177e4 LT	17	#include <linux/netfilter_bridge.h>
	18	#include "br_private.h"
	19
1a81a2e0	20	/* Don't forward packets to originating port or forwarding disabled */
9d6f229f	21	static inline int should_deliver(const struct net_bridge_port *p,
1da177e4 LT	22	const struct sk_buff *skb)
1da177e4 LT	23	{
2594e906 NA	24	struct net_bridge_vlan_group *vg;
2594e906 NA	25
907b1e6e	26	vg = nbp_vlan_group_rcu(p);
a97bfc1d	27	return ((p->flags & BR_HAIRPIN_MODE) \|\| skb->dev != p->dev) &&
0a1868b9 EA	28	(br_mst_is_enabled(p->br) \|\| p->state == BR_STATE_FORWARDING) &&
0a1868b9 EA	29	br_allowed_egress(vg, skb) && nbp_switchdev_allowed_egress(p, skb) &&
7d850abd	30	!br_skb_isolated(p, skb);
1da177e4 LT	31	}
1da177e4 LT	32
0c4b51f0	33	int br_dev_queue_push_xmit(struct net net, struct sock sk, struct sk_buff *skb)
1da177e4	34	{
28c1382f	35	skb_push(skb, ETH_HLEN);
df356d5e TM	36	if (!is_skb_forwardable(skb->dev, skb))
	37	goto drop;
	38
df356d5e	39	br_drop_fake_rtable(skb);
df356d5e TM	40
df356d5e TM	41	if (skb->ip_summed == CHECKSUM_PARTIAL &&
a98c0c47	42	eth_type_vlan(skb->protocol)) {
df356d5e TM	43	int depth;
df356d5e TM	44
4063384e	45	if (!vlan_get_protocol_and_depth(skb, skb->protocol, &depth))
df356d5e TM	46	goto drop;
	47
	48	skb_set_network_header(skb, depth);
1da177e4 LT	49	}
1da177e4 LT	50
c5381154	51	br_switchdev_frame_set_offload_fwd_mark(skb);
47211192	52
df356d5e TM	53	dev_queue_xmit(skb);
	54
	55	return 0;
	56
	57	drop:
	58	kfree_skb(skb);
1da177e4 LT	59	return 0;
1da177e4 LT	60	}
34666d46	61	EXPORT_SYMBOL_GPL(br_dev_queue_push_xmit);
1da177e4	62
0c4b51f0	63	int br_forward_finish(struct net net, struct sock sk, struct sk_buff *skb)
1da177e4	64	{
de799101	65	skb_clear_tstamp(skb);
29a26a56 EB	66	return NF_HOOK(NFPROTO_BRIDGE, NF_BR_POST_ROUTING,
29a26a56 EB	67	net, sk, skb, NULL, skb->dev,
9ef513be	68	br_dev_queue_push_xmit);
1da177e4	69
1da177e4	70	}
34666d46	71	EXPORT_SYMBOL_GPL(br_forward_finish);
1da177e4	72
37b090e6 NA	73	static void __br_forward(const struct net_bridge_port *to,
37b090e6 NA	74	struct sk_buff *skb, bool local_orig)
1da177e4	75	{
2594e906	76	struct net_bridge_vlan_group *vg;
37b090e6 NA	77	struct net_device *indev;
	78	struct net *net;
	79	int br_hook;
2594e906	80
47211192 TW	81	/* Mark the skb for forwarding offload early so that br_handle_vlan()
	82	* can know whether to pop the VLAN header on egress or keep it.
	83	*/
	84	nbp_switchdev_frame_mark_tx_fwd_offload(to, skb);
	85
907b1e6e	86	vg = nbp_vlan_group_rcu(to);
11538d03	87	skb = br_handle_vlan(to->br, to, vg, skb);
78851988 VY	88	if (!skb)
	89	return;
	90
37b090e6	91	indev = skb->dev;
1da177e4	92	skb->dev = to->dev;
37b090e6 NA	93	if (!local_orig) {
37b090e6 NA	94	if (skb_warn_if_lro(skb)) {
91d2c34a	95	kfree_skb(skb);
37b090e6	96	return;
91d2c34a	97	}
37b090e6 NA	98	br_hook = NF_BR_FORWARD;
	99	skb_forward_csum(skb);
	100	net = dev_net(indev);
	101	} else {
	102	if (unlikely(netpoll_tx_running(to->br->dev))) {
28c1382f YW	103	skb_push(skb, ETH_HLEN);
28c1382f YW	104	if (!is_skb_forwardable(skb->dev, skb))
37b090e6	105	kfree_skb(skb);
28c1382f	106	else
37b090e6	107	br_netpoll_send_skb(to, skb);
37b090e6 NA	108	return;
	109	}
	110	br_hook = NF_BR_LOCAL_OUT;
	111	net = dev_net(skb->dev);
	112	indev = NULL;
91d2c34a HX	113	}
91d2c34a HX	114
37b090e6 NA	115	NF_HOOK(NFPROTO_BRIDGE, br_hook,
37b090e6 NA	116	net, NULL, skb, indev, skb->dev,
713aefa3	117	br_forward_finish);
1da177e4 LT	118	}
1da177e4 LT	119
37b090e6 NA	120	static int deliver_clone(const struct net_bridge_port *prev,
37b090e6 NA	121	struct sk_buff *skb, bool local_orig)
1da177e4	122	{
37b090e6	123	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
1da177e4	124
37b090e6 NA	125	skb = skb_clone(skb, GFP_ATOMIC);
37b090e6 NA	126	if (!skb) {
44bdb313	127	DEV_STATS_INC(dev, tx_dropped);
37b090e6	128	return -ENOMEM;
1da177e4 LT	129	}
1da177e4 LT	130
37b090e6 NA	131	__br_forward(prev, skb, local_orig);
37b090e6 NA	132	return 0;
1da177e4 LT	133	}
1da177e4 LT	134
37b090e6 NA	135	/**
	136	* br_forward - forward a packet to a specific port
	137	* @to: destination port
	138	* @skb: packet being forwarded
	139	* @local_rcv: packet will be received locally after forwarding
	140	* @local_orig: packet is locally originated
	141	*
	142	* Should be called with rcu_read_lock.
	143	*/
	144	void br_forward(const struct net_bridge_port *to,
	145	struct sk_buff *skb, bool local_rcv, bool local_orig)
1da177e4	146	{
2756f68c NA	147	if (unlikely(!to))
	148	goto out;
	149
	150	/* redirect to backup link if the destination port is down */
	151	if (rcu_access_pointer(to->backup_port) && !netif_carrier_ok(to->dev)) {
	152	struct net_bridge_port *backup_port;
	153
	154	backup_port = rcu_dereference(to->backup_port);
	155	if (unlikely(!backup_port))
	156	goto out;
29cfb2aa	157	BR_INPUT_SKB_CB(skb)->backup_nhid = READ_ONCE(to->backup_nhid);
2756f68c NA	158	to = backup_port;
	159	}
	160
	161	if (should_deliver(to, skb)) {
b35c5f63	162	if (local_rcv)
37b090e6	163	deliver_clone(to, skb, local_orig);
7f7708f0	164	else
37b090e6	165	__br_forward(to, skb, local_orig);
1da177e4 LT	166	return;
	167	}
	168
2756f68c	169	out:
b35c5f63	170	if (!local_rcv)
7f7708f0	171	kfree_skb(skb);
1da177e4	172	}
37b090e6	173	EXPORT_SYMBOL_GPL(br_forward);
025d89c2 HX	174
	175	static struct net_bridge_port *maybe_deliver(
	176	struct net_bridge_port prev, struct net_bridge_port p,
37b090e6	177	struct sk_buff *skb, bool local_orig)
025d89c2	178	{
847d44ef	179	u8 igmp_type = br_multicast_igmp_type(skb);
025d89c2 HX	180	int err;
	181
	182	if (!should_deliver(p, skb))
	183	return prev;
	184
47211192 TW	185	nbp_switchdev_frame_mark_tx_fwd_to_hwdom(p, skb);
47211192 TW	186
025d89c2 HX	187	if (!prev)
	188	goto out;
	189
37b090e6	190	err = deliver_clone(prev, skb, local_orig);
025d89c2 HX	191	if (err)
025d89c2 HX	192	return ERR_PTR(err);
025d89c2	193	out:
847d44ef PNA	194	br_multicast_count(p->br, p, skb, igmp_type, BR_MCAST_DIR_TX);
847d44ef PNA	195
025d89c2 HX	196	return p;
	197	}
	198
37b090e6 NA	199	/* called under rcu_read_lock */
37b090e6 NA	200	void br_flood(struct net_bridge br, struct sk_buff skb,
e408336a IS	201	enum br_pkt_type pkt_type, bool local_rcv, bool local_orig,
e408336a IS	202	u16 vid)
1da177e4	203	{
623e43c2	204	enum skb_drop_reason reason = SKB_DROP_REASON_NO_TX_TARGET;
37b090e6	205	struct net_bridge_port *prev = NULL;
1080ab95	206	struct net_bridge_port *p;
1da177e4	207
7b4858df IS	208	br_tc_skb_miss_set(skb, pkt_type != BR_PKT_BROADCAST);
7b4858df IS	209
1da177e4	210	list_for_each_entry_rcu(p, &br->port_list, list) {
99f906e9 MM	211	/* Do not flood unicast traffic to ports that turn it off, nor
	212	* other traffic if flood off, except for traffic we originate
	213	*/
	214	switch (pkt_type) {
	215	case BR_PKT_UNICAST:
	216	if (!(p->flags & BR_FLOOD))
	217	continue;
	218	break;
	219	case BR_PKT_MULTICAST:
	220	if (!(p->flags & BR_MCAST_FLOOD) && skb->dev != br->dev)
	221	continue;
	222	break;
	223	case BR_PKT_BROADCAST:
	224	if (!(p->flags & BR_BCAST_FLOOD) && skb->dev != br->dev)
	225	continue;
	226	break;
	227	}
95850116 KP	228
	229	/* Do not flood to ports that enable proxy ARP */
	230	if (p->flags & BR_PROXYARP)
	231	continue;
013a7ce8	232	if (BR_INPUT_SKB_CB(skb)->proxyarp_replied &&
3aca683e IS	233	((p->flags & BR_PROXYARP_WIFI) \|\|
3aca683e IS	234	br_is_neigh_suppress_enabled(p, vid)))
842a9ae0	235	continue;
95850116	236
37b090e6	237	prev = maybe_deliver(prev, p, skb, local_orig);
623e43c2 RR	238	if (IS_ERR(prev)) {
	239	reason = PTR_ERR(prev) == -ENOMEM ? SKB_DROP_REASON_NOMEM :
	240	SKB_DROP_REASON_NOT_SPECIFIED;
025d89c2	241	goto out;
623e43c2	242	}
1da177e4 LT	243	}
1da177e4 LT	244
b33084be HX	245	if (!prev)
	246	goto out;
	247
b35c5f63	248	if (local_rcv)
37b090e6	249	deliver_clone(prev, skb, local_orig);
025d89c2	250	else
37b090e6	251	__br_forward(prev, skb, local_orig);
b33084be	252	return;
1da177e4	253
b33084be	254	out:
b35c5f63	255	if (!local_rcv)
623e43c2	256	kfree_skb_reason(skb, reason);
1da177e4 LT	257	}
1da177e4 LT	258
5cb5e947	259	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
5b9d6b15 AB	260	static void maybe_deliver_addr(struct net_bridge_port p, struct sk_buff skb,
	261	const unsigned char *addr, bool local_orig)
	262	{
	263	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
	264	const unsigned char *src = eth_hdr(skb)->h_source;
86b29d83	265	struct sk_buff *nskb;
5b9d6b15 AB	266
	267	if (!should_deliver(p, skb))
	268	return;
	269
	270	/* Even with hairpin, no soliloquies - prevent breaking IPv6 DAD */
	271	if (skb->dev == p->dev && ether_addr_equal(src, addr))
	272	return;
	273
86b29d83 FF	274	__skb_push(skb, ETH_HLEN);
	275	nskb = pskb_copy(skb, GFP_ATOMIC);
	276	__skb_pull(skb, ETH_HLEN);
	277	if (!nskb) {
44bdb313	278	DEV_STATS_INC(dev, tx_dropped);
5b9d6b15 AB	279	return;
	280	}
	281
86b29d83 FF	282	skb = nskb;
86b29d83 FF	283	__skb_pull(skb, ETH_HLEN);
5b9d6b15 AB	284	if (!is_broadcast_ether_addr(addr))
	285	memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);
	286
	287	__br_forward(p, skb, local_orig);
	288	}
	289
5cb5e947	290	/* called with rcu_read_lock */
37b090e6 NA	291	void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
37b090e6 NA	292	struct sk_buff *skb,
adc47037	293	struct net_bridge_mcast *brmctx,
37b090e6	294	bool local_rcv, bool local_orig)
5cb5e947	295	{
623e43c2	296	enum skb_drop_reason reason = SKB_DROP_REASON_NO_TX_TARGET;
afe0159d	297	struct net_bridge_port *prev = NULL;
5cb5e947	298	struct net_bridge_port_group *p;
36cfec73	299	bool allow_mode_include = true;
5cb5e947 HX	300	struct hlist_node *rp;
5cb5e947 HX	301
adc47037	302	rp = br_multicast_get_first_rport_node(brmctx, skb);
44ebb081	303
36cfec73 NA	304	if (mdst) {
36cfec73 NA	305	p = rcu_dereference(mdst->ports);
adc47037	306	if (br_multicast_should_handle_mode(brmctx, mdst->addr.proto) &&
36cfec73 NA	307	br_multicast_is_star_g(&mdst->addr))
	308	allow_mode_include = false;
	309	} else {
	310	p = NULL;
7b4858df	311	br_tc_skb_miss_set(skb, true);
36cfec73 NA	312	}
36cfec73 NA	313
5cb5e947	314	while (p \|\| rp) {
afe0159d	315	struct net_bridge_port port, lport, *rport;
afe0159d	316
085b53c8	317	lport = p ? p->key.port : NULL;
44ebb081	318	rport = br_multicast_rport_from_node_skb(rp, skb);
5cb5e947	319
6db6f0ea FF	320	if ((unsigned long)lport > (unsigned long)rport) {
	321	port = lport;
	322
	323	if (port->flags & BR_MULTICAST_TO_UNICAST) {
	324	maybe_deliver_addr(lport, skb, p->eth_addr,
	325	local_orig);
	326	goto delivered;
	327	}
36cfec73 NA	328	if ((!allow_mode_include &&
	329	p->filter_mode == MCAST_INCLUDE) \|\|
	330	(p->flags & MDB_PG_FLAGS_BLOCKED))
	331	goto delivered;
6db6f0ea FF	332	} else {
	333	port = rport;
	334	}
5cb5e947	335
37b090e6	336	prev = maybe_deliver(prev, port, skb, local_orig);
623e43c2 RR	337	if (IS_ERR(prev)) {
	338	reason = PTR_ERR(prev) == -ENOMEM ? SKB_DROP_REASON_NOMEM :
	339	SKB_DROP_REASON_NOT_SPECIFIED;
5cb5e947	340	goto out;
623e43c2	341	}
847d44ef	342	delivered:
5cb5e947	343	if ((unsigned long)lport >= (unsigned long)port)
83f6a740	344	p = rcu_dereference(p->next);
5cb5e947	345	if ((unsigned long)rport >= (unsigned long)port)
e8051688	346	rp = rcu_dereference(hlist_next_rcu(rp));
5cb5e947 HX	347	}
	348
	349	if (!prev)
	350	goto out;
	351
b35c5f63	352	if (local_rcv)
37b090e6	353	deliver_clone(prev, skb, local_orig);
5cb5e947	354	else
37b090e6	355	__br_forward(prev, skb, local_orig);
5cb5e947 HX	356	return;
	357
	358	out:
b35c5f63	359	if (!local_rcv)
623e43c2	360	kfree_skb_reason(skb, reason);
5cb5e947	361	}
5cb5e947	362	#endif