[mirror_ubuntu-zesty-kernel.git] / net / bridge / br_input.c

/*
 *	Handle incoming frames
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 */

#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/netfilter_bridge.h>
#include <linux/neighbour.h>
#include <net/arp.h>
#include <linux/export.h>
#include <linux/rculist.h>
#include "br_private.h"

/* Hook for brouter */
br_should_route_hook_t __rcu *br_should_route_hook __read_mostly;
EXPORT_SYMBOL(br_should_route_hook);

static int
br_netif_receive_skb(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	return netif_receive_skb(skb);
}

static int br_pass_frame_up(struct sk_buff *skb)
{
	struct net_device *indev, *brdev = BR_INPUT_SKB_CB(skb)->brdev;
	struct net_bridge *br = netdev_priv(brdev);
	struct net_bridge_vlan_group *vg;
	struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);

	u64_stats_update_begin(&brstats->syncp);
	brstats->rx_packets++;
	brstats->rx_bytes += skb->len;
	u64_stats_update_end(&brstats->syncp);

	vg = br_vlan_group_rcu(br);
	/* Bridge is just like any other port.  Make sure the
	 * packet is allowed except in promisc modue when someone
	 * may be running packet capture.
	 */
	if (!(brdev->flags & IFF_PROMISC) &&
	    !br_allowed_egress(vg, skb)) {
		kfree_skb(skb);
		return NET_RX_DROP;
	}

	indev = skb->dev;
	skb->dev = brdev;
	skb = br_handle_vlan(br, vg, skb);
	if (!skb)
		return NET_RX_DROP;
	/* update the multicast stats if the packet is IGMP/MLD */
	br_multicast_count(br, NULL, skb, br_multicast_igmp_type(skb),
			   BR_MCAST_DIR_TX);

	return NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN,
		       dev_net(indev), NULL, skb, indev, NULL,
		       br_netif_receive_skb);
}

static void br_do_proxy_arp(struct sk_buff *skb, struct net_bridge *br,
			    u16 vid, struct net_bridge_port *p)
{
	struct net_device *dev = br->dev;
	struct neighbour *n;
	struct arphdr *parp;
	u8 *arpptr, *sha;
	__be32 sip, tip;

	BR_INPUT_SKB_CB(skb)->proxyarp_replied = false;

	if ((dev->flags & IFF_NOARP) ||
	    !pskb_may_pull(skb, arp_hdr_len(dev)))
		return;

	parp = arp_hdr(skb);

	if (parp->ar_pro != htons(ETH_P_IP) ||
	    parp->ar_op != htons(ARPOP_REQUEST) ||
	    parp->ar_hln != dev->addr_len ||
	    parp->ar_pln != 4)
		return;

	arpptr = (u8 *)parp + sizeof(struct arphdr);
	sha = arpptr;
	arpptr += dev->addr_len;	/* sha */
	memcpy(&sip, arpptr, sizeof(sip));
	arpptr += sizeof(sip);
	arpptr += dev->addr_len;	/* tha */
	memcpy(&tip, arpptr, sizeof(tip));

	if (ipv4_is_loopback(tip) ||
	    ipv4_is_multicast(tip))
		return;

	n = neigh_lookup(&arp_tbl, &tip, dev);
	if (n) {
		struct net_bridge_fdb_entry *f;

		if (!(n->nud_state & NUD_VALID)) {
			neigh_release(n);
			return;
		}

		f = __br_fdb_get(br, n->ha, vid);
		if (f && ((p->flags & BR_PROXYARP) ||
			  (f->dst && (f->dst->flags & BR_PROXYARP_WIFI)))) {
			arp_send(ARPOP_REPLY, ETH_P_ARP, sip, skb->dev, tip,
				 sha, n->ha, sha);
			BR_INPUT_SKB_CB(skb)->proxyarp_replied = true;
		}

		neigh_release(n);
	}
}

/* note: already called with rcu_read_lock */
int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
	const unsigned char *dest = eth_hdr(skb)->h_dest;
	enum br_pkt_type pkt_type = BR_PKT_UNICAST;
	struct net_bridge_fdb_entry *dst = NULL;
	struct net_bridge_mdb_entry *mdst;
	bool local_rcv, mcast_hit = false;
	struct net_bridge *br;
	u16 vid = 0;

	if (!p || p->state == BR_STATE_DISABLED)
		goto drop;

	if (!br_allowed_ingress(p->br, nbp_vlan_group_rcu(p), skb, &vid))
		goto out;

	nbp_switchdev_frame_mark(p, skb);

	/* insert into forwarding database after filtering to avoid spoofing */
	br = p->br;
	if (p->flags & BR_LEARNING)
		br_fdb_update(br, p, eth_hdr(skb)->h_source, vid, false);

	local_rcv = !!(br->dev->flags & IFF_PROMISC);
	if (is_multicast_ether_addr(dest)) {
		/* by definition the broadcast is also a multicast address */
		if (is_broadcast_ether_addr(dest)) {
			pkt_type = BR_PKT_BROADCAST;
			local_rcv = true;
		} else {
			pkt_type = BR_PKT_MULTICAST;
			if (br_multicast_rcv(br, p, skb, vid))
				goto drop;
		}
	}

	if (p->state == BR_STATE_LEARNING)
		goto drop;

	BR_INPUT_SKB_CB(skb)->brdev = br->dev;

	if (IS_ENABLED(CONFIG_INET) && skb->protocol == htons(ETH_P_ARP))
		br_do_proxy_arp(skb, br, vid, p);

	switch (pkt_type) {
	case BR_PKT_MULTICAST:
		mdst = br_mdb_get(br, skb, vid);
		if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
		    br_multicast_querier_exists(br, eth_hdr(skb))) {
			if ((mdst && mdst->mglist) ||
			    br_multicast_is_router(br)) {
				local_rcv = true;
				br->dev->stats.multicast++;
			}
			mcast_hit = true;
		} else {
			local_rcv = true;
			br->dev->stats.multicast++;
		}
		break;
	case BR_PKT_UNICAST:
		dst = __br_fdb_get(br, dest, vid);
	default:
		break;
	}

	if (dst) {
		if (dst->is_local)
			return br_pass_frame_up(skb);

		dst->used = jiffies;
		br_forward(dst->dst, skb, local_rcv, false);
	} else {
		if (!mcast_hit)
			br_flood(br, skb, pkt_type, local_rcv, false);
		else
			br_multicast_flood(mdst, skb, local_rcv, false);
	}

	if (local_rcv)
		return br_pass_frame_up(skb);

out:
	return 0;
drop:
	kfree_skb(skb);
	goto out;
}
EXPORT_SYMBOL_GPL(br_handle_frame_finish);

static void __br_handle_local_finish(struct sk_buff *skb)
{
	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
	u16 vid = 0;

	/* check if vlan is allowed, to avoid spoofing */
	if (p->flags & BR_LEARNING && br_should_learn(p, skb, &vid))
		br_fdb_update(p->br, p, eth_hdr(skb)->h_source, vid, false);
}

/* note: already called with rcu_read_lock */
static int br_handle_local_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	struct net_bridge_port *p = br_port_get_rcu(skb->dev);

	__br_handle_local_finish(skb);

	BR_INPUT_SKB_CB(skb)->brdev = p->br->dev;
	br_pass_frame_up(skb);
	return 0;
}

/*
 * Return NULL if skb is handled
 * note: already called with rcu_read_lock
 */
rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
{
	struct net_bridge_port *p;
	struct sk_buff *skb = *pskb;
	const unsigned char *dest = eth_hdr(skb)->h_dest;
	br_should_route_hook_t *rhook;

	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
		return RX_HANDLER_PASS;

	if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
		goto drop;

	skb = skb_share_check(skb, GFP_ATOMIC);
	if (!skb)
		return RX_HANDLER_CONSUMED;

	p = br_port_get_rcu(skb->dev);

	if (unlikely(is_link_local_ether_addr(dest))) {
		u16 fwd_mask = p->br->group_fwd_mask_required;

		/*
		 * See IEEE 802.1D Table 7-10 Reserved addresses
		 *
		 * Assignment		 		Value
		 * Bridge Group Address		01-80-C2-00-00-00
		 * (MAC Control) 802.3		01-80-C2-00-00-01
		 * (Link Aggregation) 802.3	01-80-C2-00-00-02
		 * 802.1X PAE address		01-80-C2-00-00-03
		 *
		 * 802.1AB LLDP 		01-80-C2-00-00-0E
		 *
		 * Others reserved for future standardization
		 */
		switch (dest[5]) {
		case 0x00:	/* Bridge Group Address */
			/* If STP is turned off,
			   then must forward to keep loop detection */
			if (p->br->stp_enabled == BR_NO_STP ||
			    fwd_mask & (1u << dest[5]))
				goto forward;
			*pskb = skb;
			__br_handle_local_finish(skb);
			return RX_HANDLER_PASS;

		case 0x01:	/* IEEE MAC (Pause) */
			goto drop;

		case 0x0E:	/* 802.1AB LLDP */
			fwd_mask |= p->br->group_fwd_mask;
			if (fwd_mask & (1u << dest[5]))
				goto forward;
			*pskb = skb;
			__br_handle_local_finish(skb);
			return RX_HANDLER_PASS;

		default:
			/* Allow selective forwarding for most other protocols */
			fwd_mask |= p->br->group_fwd_mask;
			if (fwd_mask & (1u << dest[5]))
				goto forward;
		}

		/* Deliver packet to local host only */
		NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, dev_net(skb->dev),
			NULL, skb, skb->dev, NULL, br_handle_local_finish);
		return RX_HANDLER_CONSUMED;
	}

forward:
	switch (p->state) {
	case BR_STATE_FORWARDING:
		rhook = rcu_dereference(br_should_route_hook);
		if (rhook) {
			if ((*rhook)(skb)) {
				*pskb = skb;
				return RX_HANDLER_PASS;
			}
			dest = eth_hdr(skb)->h_dest;
		}
		/* fall through */
	case BR_STATE_LEARNING:
		if (ether_addr_equal(p->br->dev->dev_addr, dest))
			skb->pkt_type = PACKET_HOST;

		NF_HOOK(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING,
			dev_net(skb->dev), NULL, skb, skb->dev, NULL,
			br_handle_frame_finish);
		break;
	default:
drop:
		kfree_skb(skb);
	}
	return RX_HANDLER_CONSUMED;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Handle incoming frames
	3	* Linux ethernet bridge
	4	*
	5	* Authors:
	6	* Lennert Buytenhek <buytenh@gnu.org>
	7	*
1da177e4 LT	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version
	11	* 2 of the License, or (at your option) any later version.
	12	*/
	13
5a0e3ad6	14	#include <linux/slab.h>
1da177e4 LT	15	#include <linux/kernel.h>
	16	#include <linux/netdevice.h>
	17	#include <linux/etherdevice.h>
	18	#include <linux/netfilter_bridge.h>
95850116 KP	19	#include <linux/neighbour.h>
95850116 KP	20	#include <net/arp.h>
bc3b2d7f	21	#include <linux/export.h>
a37b85c9	22	#include <linux/rculist.h>
1da177e4 LT	23	#include "br_private.h"
1da177e4 LT	24
a386f990 ED	25	/* Hook for brouter */
	26	br_should_route_hook_t __rcu *br_should_route_hook __read_mostly;
	27	EXPORT_SYMBOL(br_should_route_hook);
	28
0c4b51f0 EB	29	static int
0c4b51f0 EB	30	br_netif_receive_skb(struct net net, struct sock sk, struct sk_buff *skb)
04eb4489 EB	31	{
	32	return netif_receive_skb(skb);
	33	}
	34
68b7c895	35	static int br_pass_frame_up(struct sk_buff *skb)
1da177e4	36	{
68b7c895	37	struct net_device indev, brdev = BR_INPUT_SKB_CB(skb)->brdev;
14bb4789	38	struct net_bridge *br = netdev_priv(brdev);
2594e906	39	struct net_bridge_vlan_group *vg;
8f84985f	40	struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
1da177e4	41
406818ff	42	u64_stats_update_begin(&brstats->syncp);
14bb4789	43	brstats->rx_packets++;
14bb4789	44	brstats->rx_bytes += skb->len;
406818ff	45	u64_stats_update_end(&brstats->syncp);
1da177e4	46
907b1e6e	47	vg = br_vlan_group_rcu(br);
85f46c6b VY	48	/* Bridge is just like any other port. Make sure the
	49	* packet is allowed except in promisc modue when someone
	50	* may be running packet capture.
	51	*/
	52	if (!(brdev->flags & IFF_PROMISC) &&
2594e906	53	!br_allowed_egress(vg, skb)) {
85f46c6b VY	54	kfree_skb(skb);
	55	return NET_RX_DROP;
	56	}
	57
1da177e4	58	indev = skb->dev;
a339f1c8	59	skb->dev = brdev;
2594e906	60	skb = br_handle_vlan(br, vg, skb);
fc92f745 VY	61	if (!skb)
fc92f745 VY	62	return NET_RX_DROP;
1080ab95	63	/* update the multicast stats if the packet is IGMP/MLD */
a65056ec	64	br_multicast_count(br, NULL, skb, br_multicast_igmp_type(skb),
1080ab95	65	BR_MCAST_DIR_TX);
1da177e4	66
29a26a56 EB	67	return NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN,
29a26a56 EB	68	dev_net(indev), NULL, skb, indev, NULL,
04eb4489	69	br_netif_receive_skb);
1da177e4 LT	70	}
1da177e4 LT	71
95850116	72	static void br_do_proxy_arp(struct sk_buff skb, struct net_bridge br,
842a9ae0	73	u16 vid, struct net_bridge_port *p)
95850116 KP	74	{
	75	struct net_device *dev = br->dev;
	76	struct neighbour *n;
	77	struct arphdr *parp;
	78	u8 arpptr, sha;
	79	__be32 sip, tip;
	80
842a9ae0 JM	81	BR_INPUT_SKB_CB(skb)->proxyarp_replied = false;
842a9ae0 JM	82
85a3d4a9 NA	83	if ((dev->flags & IFF_NOARP) \|\|
85a3d4a9 NA	84	!pskb_may_pull(skb, arp_hdr_len(dev)))
95850116 KP	85	return;
95850116 KP	86
95850116 KP	87	parp = arp_hdr(skb);
	88
	89	if (parp->ar_pro != htons(ETH_P_IP) \|\|
	90	parp->ar_op != htons(ARPOP_REQUEST) \|\|
	91	parp->ar_hln != dev->addr_len \|\|
	92	parp->ar_pln != 4)
	93	return;
	94
	95	arpptr = (u8 *)parp + sizeof(struct arphdr);
	96	sha = arpptr;
	97	arpptr += dev->addr_len; /* sha */
	98	memcpy(&sip, arpptr, sizeof(sip));
	99	arpptr += sizeof(sip);
	100	arpptr += dev->addr_len; /* tha */
	101	memcpy(&tip, arpptr, sizeof(tip));
	102
	103	if (ipv4_is_loopback(tip) \|\|
	104	ipv4_is_multicast(tip))
	105	return;
	106
	107	n = neigh_lookup(&arp_tbl, &tip, dev);
	108	if (n) {
	109	struct net_bridge_fdb_entry *f;
	110
	111	if (!(n->nud_state & NUD_VALID)) {
	112	neigh_release(n);
	113	return;
	114	}
	115
	116	f = __br_fdb_get(br, n->ha, vid);
842a9ae0 JM	117	if (f && ((p->flags & BR_PROXYARP) \|\|
842a9ae0 JM	118	(f->dst && (f->dst->flags & BR_PROXYARP_WIFI)))) {
95850116 KP	119	arp_send(ARPOP_REPLY, ETH_P_ARP, sip, skb->dev, tip,
95850116 KP	120	sha, n->ha, sha);
842a9ae0 JM	121	BR_INPUT_SKB_CB(skb)->proxyarp_replied = true;
842a9ae0 JM	122	}
95850116 KP	123
	124	neigh_release(n);
	125	}
	126	}
	127
eeaf61d8	128	/* note: already called with rcu_read_lock */
0c4b51f0	129	int br_handle_frame_finish(struct net net, struct sock sk, struct sk_buff *skb)
1da177e4	130	{
f350a0a8	131	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
46c0772d	132	const unsigned char *dest = eth_hdr(skb)->h_dest;
8addd5e7	133	enum br_pkt_type pkt_type = BR_PKT_UNICAST;
46c0772d	134	struct net_bridge_fdb_entry *dst = NULL;
c4fcb78c	135	struct net_bridge_mdb_entry *mdst;
8addd5e7	136	bool local_rcv, mcast_hit = false;
46c0772d	137	struct net_bridge *br;
78851988	138	u16 vid = 0;
1da177e4	139
b3f1be4b SH	140	if (!p \|\| p->state == BR_STATE_DISABLED)
	141	goto drop;
	142
907b1e6e	143	if (!br_allowed_ingress(p->br, nbp_vlan_group_rcu(p), skb, &vid))
eb707618	144	goto out;
a37b85c9	145
6bc506b4 IS	146	nbp_switchdev_frame_mark(p, skb);
6bc506b4 IS	147
85967bb4	148	/* insert into forwarding database after filtering to avoid spoofing */
b3f1be4b	149	br = p->br;
9ba18891	150	if (p->flags & BR_LEARNING)
a5642ab4	151	br_fdb_update(br, p, eth_hdr(skb)->h_source, vid, false);
85967bb4	152
8addd5e7 NA	153	local_rcv = !!(br->dev->flags & IFF_PROMISC);
	154	if (is_multicast_ether_addr(dest)) {
	155	/* by definition the broadcast is also a multicast address */
	156	if (is_broadcast_ether_addr(dest)) {
	157	pkt_type = BR_PKT_BROADCAST;
	158	local_rcv = true;
	159	} else {
	160	pkt_type = BR_PKT_MULTICAST;
	161	if (br_multicast_rcv(br, p, skb, vid))
	162	goto drop;
	163	}
	164	}
c4fcb78c	165
b3f1be4b SH	166	if (p->state == BR_STATE_LEARNING)
b3f1be4b SH	167	goto drop;
0e5eabac	168
68b7c895 HX	169	BR_INPUT_SKB_CB(skb)->brdev = br->dev;
68b7c895 HX	170
842a9ae0 JM	171	if (IS_ENABLED(CONFIG_INET) && skb->protocol == htons(ETH_P_ARP))
842a9ae0 JM	172	br_do_proxy_arp(skb, br, vid, p);
95850116	173
8addd5e7 NA	174	switch (pkt_type) {
8addd5e7 NA	175	case BR_PKT_MULTICAST:
fbca58a2	176	mdst = br_mdb_get(br, skb, vid);
b00589af	177	if ((mdst \|\| BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
cc0fdd80	178	br_multicast_querier_exists(br, eth_hdr(skb))) {
8a870178	179	if ((mdst && mdst->mglist) \|\|
e151aab9	180	br_multicast_is_router(br)) {
b35c5f63	181	local_rcv = true;
e151aab9 NA	182	br->dev->stats.multicast++;
	183	}
	184	mcast_hit = true;
46c0772d	185	} else {
b35c5f63	186	local_rcv = true;
e151aab9	187	br->dev->stats.multicast++;
46c0772d	188	}
8addd5e7 NA	189	break;
	190	case BR_PKT_UNICAST:
	191	dst = __br_fdb_get(br, dest, vid);
	192	default:
	193	break;
1da177e4 LT	194	}
1da177e4 LT	195
e151aab9	196	if (dst) {
8addd5e7 NA	197	if (dst->is_local)
	198	return br_pass_frame_up(skb);
	199
e151aab9	200	dst->used = jiffies;
37b090e6	201	br_forward(dst->dst, skb, local_rcv, false);
e151aab9 NA	202	} else {
e151aab9 NA	203	if (!mcast_hit)
8addd5e7	204	br_flood(br, skb, pkt_type, local_rcv, false);
e151aab9	205	else
37b090e6	206	br_multicast_flood(mdst, skb, local_rcv, false);
e081e1e3	207	}
1da177e4	208
b35c5f63 NA	209	if (local_rcv)
b35c5f63 NA	210	return br_pass_frame_up(skb);
87557c18	211
1da177e4 LT	212	out:
1da177e4 LT	213	return 0;
b3f1be4b SH	214	drop:
	215	kfree_skb(skb);
	216	goto out;
1da177e4	217	}
34666d46	218	EXPORT_SYMBOL_GPL(br_handle_frame_finish);
1da177e4	219
56fae404	220	static void __br_handle_local_finish(struct sk_buff *skb)
cf0f02d0	221	{
f350a0a8	222	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
2ba071ec	223	u16 vid = 0;
cf0f02d0	224
e0d7968a TM	225	/* check if vlan is allowed, to avoid spoofing */
e0d7968a TM	226	if (p->flags & BR_LEARNING && br_should_learn(p, skb, &vid))
a5642ab4	227	br_fdb_update(p->br, p, eth_hdr(skb)->h_source, vid, false);
56fae404 IS	228	}
	229
	230	/* note: already called with rcu_read_lock */
	231	static int br_handle_local_finish(struct net net, struct sock sk, struct sk_buff *skb)
	232	{
	233	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
	234
	235	__br_handle_local_finish(skb);
8626c56c FW	236
	237	BR_INPUT_SKB_CB(skb)->brdev = p->br->dev;
	238	br_pass_frame_up(skb);
	239	return 0;
cf0f02d0 SH	240	}
cf0f02d0 SH	241
1da177e4	242	/*
6229e362	243	* Return NULL if skb is handled
eeaf61d8	244	* note: already called with rcu_read_lock
1da177e4	245	*/
8a4eb573	246	rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
1da177e4	247	{
ab95bfe0	248	struct net_bridge_port *p;
8a4eb573	249	struct sk_buff skb = pskb;
1da177e4	250	const unsigned char *dest = eth_hdr(skb)->h_dest;
a386f990	251	br_should_route_hook_t *rhook;
1da177e4	252
c2368e79	253	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
8a4eb573	254	return RX_HANDLER_PASS;
ab95bfe0	255
1da177e4	256	if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
467aea0d	257	goto drop;
1da177e4	258
7b995651 HX	259	skb = skb_share_check(skb, GFP_ATOMIC);
7b995651 HX	260	if (!skb)
8a4eb573	261	return RX_HANDLER_CONSUMED;
7b995651	262
f350a0a8	263	p = br_port_get_rcu(skb->dev);
ab95bfe0	264
46acc460	265	if (unlikely(is_link_local_ether_addr(dest))) {
f2808d22 TM	266	u16 fwd_mask = p->br->group_fwd_mask_required;
f2808d22 TM	267
515853cc	268	/*
	269	* See IEEE 802.1D Table 7-10 Reserved addresses
	270	*
	271	* Assignment Value
	272	* Bridge Group Address 01-80-C2-00-00-00
	273	* (MAC Control) 802.3 01-80-C2-00-00-01
	274	* (Link Aggregation) 802.3 01-80-C2-00-00-02
	275	* 802.1X PAE address 01-80-C2-00-00-03
	276	*
	277	* 802.1AB LLDP 01-80-C2-00-00-0E
	278	*
	279	* Others reserved for future standardization
	280	*/
	281	switch (dest[5]) {
	282	case 0x00: /* Bridge Group Address */
	283	/* If STP is turned off,
	284	then must forward to keep loop detection */
f2808d22 TM	285	if (p->br->stp_enabled == BR_NO_STP \|\|
f2808d22 TM	286	fwd_mask & (1u << dest[5]))
515853cc	287	goto forward;
56fae404 IS	288	*pskb = skb;
	289	__br_handle_local_finish(skb);
	290	return RX_HANDLER_PASS;
515853cc	291
515853cc	292	case 0x01: /* IEEE MAC (Pause) */
2111f8b9 SH	293	goto drop;
2111f8b9 SH	294
baedbe55 IS	295	case 0x0E: /* 802.1AB LLDP */
	296	fwd_mask \|= p->br->group_fwd_mask;
	297	if (fwd_mask & (1u << dest[5]))
	298	goto forward;
	299	*pskb = skb;
	300	__br_handle_local_finish(skb);
	301	return RX_HANDLER_PASS;
	302
515853cc	303	default:
515853cc	304	/* Allow selective forwarding for most other protocols */
f2808d22 TM	305	fwd_mask \|= p->br->group_fwd_mask;
f2808d22 TM	306	if (fwd_mask & (1u << dest[5]))
515853cc	307	goto forward;
515853cc	308	}
a598f6ae	309
515853cc	310	/* Deliver packet to local host only */
8626c56c FW	311	NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, dev_net(skb->dev),
	312	NULL, skb, skb->dev, NULL, br_handle_local_finish);
	313	return RX_HANDLER_CONSUMED;
2111f8b9	314	}
1da177e4	315
a598f6ae	316	forward:
467aea0d SH	317	switch (p->state) {
467aea0d SH	318	case BR_STATE_FORWARDING:
82de382c	319	rhook = rcu_dereference(br_should_route_hook);
a386f990	320	if (rhook) {
8a4eb573 JP	321	if ((*rhook)(skb)) {
	322	*pskb = skb;
	323	return RX_HANDLER_PASS;
	324	}
1da177e4 LT	325	dest = eth_hdr(skb)->h_dest;
1da177e4 LT	326	}
467aea0d SH	327	/* fall through */
467aea0d SH	328	case BR_STATE_LEARNING:
9a7b6ef9	329	if (ether_addr_equal(p->br->dev->dev_addr, dest))
1da177e4 LT	330	skb->pkt_type = PACKET_HOST;
1da177e4 LT	331
29a26a56 EB	332	NF_HOOK(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING,
29a26a56 EB	333	dev_net(skb->dev), NULL, skb, skb->dev, NULL,
1da177e4	334	br_handle_frame_finish);
467aea0d SH	335	break;
	336	default:
	337	drop:
	338	kfree_skb(skb);
1da177e4	339	}
8a4eb573	340	return RX_HANDLER_CONSUMED;
1da177e4	341	}