[linux-2.6-block.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)
		return;

	if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
		dev->stats.tx_dropped++;
		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)
{
	const unsigned char *dest = eth_hdr(skb)->h_dest;
	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
	struct net_bridge *br;
	struct net_bridge_fdb_entry *dst;
	struct net_bridge_mdb_entry *mdst;
	struct sk_buff *skb2;
	bool unicast = true;
	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;

	/* 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);

	if (!is_broadcast_ether_addr(dest) && is_multicast_ether_addr(dest) &&
	    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;

	/* The packet skb2 goes to the local host (NULL to skip). */
	skb2 = NULL;

	if (br->dev->flags & IFF_PROMISC)
		skb2 = skb;

	dst = NULL;

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

	if (is_broadcast_ether_addr(dest)) {
		skb2 = skb;
		unicast = false;
	} else if (is_multicast_ether_addr(dest)) {
		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))
				skb2 = skb;
			br_multicast_forward(mdst, skb, skb2);
			skb = NULL;
			if (!skb2)
				goto out;
		} else
			skb2 = skb;

		unicast = false;
		br->dev->stats.multicast++;
	} else if ((dst = __br_fdb_get(br, dest, vid)) &&
			dst->is_local) {
		skb2 = skb;
		/* Do not forward the packet since it's local. */
		skb = NULL;
	}

	if (skb) {
		if (dst) {
			dst->used = jiffies;
			br_forward(dst->dst, skb, skb2);
		} else
			br_flood_forward(br, skb, skb2, unicast);
	}

	if (skb2)
		return br_pass_frame_up(skb2);

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;

		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
95850116 KP	83	if (dev->flags & IFF_NOARP)
	84	return;
	85
	86	if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
	87	dev->stats.tx_dropped++;
	88	return;
	89	}
	90	parp = arp_hdr(skb);
	91
	92	if (parp->ar_pro != htons(ETH_P_IP) \|\|
	93	parp->ar_op != htons(ARPOP_REQUEST) \|\|
	94	parp->ar_hln != dev->addr_len \|\|
	95	parp->ar_pln != 4)
	96	return;
	97
	98	arpptr = (u8 *)parp + sizeof(struct arphdr);
	99	sha = arpptr;
	100	arpptr += dev->addr_len; /* sha */
	101	memcpy(&sip, arpptr, sizeof(sip));
	102	arpptr += sizeof(sip);
	103	arpptr += dev->addr_len; /* tha */
	104	memcpy(&tip, arpptr, sizeof(tip));
	105
	106	if (ipv4_is_loopback(tip) \|\|
	107	ipv4_is_multicast(tip))
	108	return;
	109
	110	n = neigh_lookup(&arp_tbl, &tip, dev);
	111	if (n) {
	112	struct net_bridge_fdb_entry *f;
	113
	114	if (!(n->nud_state & NUD_VALID)) {
	115	neigh_release(n);
	116	return;
	117	}
	118
	119	f = __br_fdb_get(br, n->ha, vid);
842a9ae0 JM	120	if (f && ((p->flags & BR_PROXYARP) \|\|
842a9ae0 JM	121	(f->dst && (f->dst->flags & BR_PROXYARP_WIFI)))) {
95850116 KP	122	arp_send(ARPOP_REPLY, ETH_P_ARP, sip, skb->dev, tip,
95850116 KP	123	sha, n->ha, sha);
842a9ae0 JM	124	BR_INPUT_SKB_CB(skb)->proxyarp_replied = true;
842a9ae0 JM	125	}
95850116 KP	126
	127	neigh_release(n);
	128	}
	129	}
	130
eeaf61d8	131	/* note: already called with rcu_read_lock */
0c4b51f0	132	int br_handle_frame_finish(struct net net, struct sock sk, struct sk_buff *skb)
1da177e4 LT	133	{
1da177e4 LT	134	const unsigned char *dest = eth_hdr(skb)->h_dest;
f350a0a8	135	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
b3f1be4b	136	struct net_bridge *br;
1da177e4	137	struct net_bridge_fdb_entry *dst;
c4fcb78c	138	struct net_bridge_mdb_entry *mdst;
e081e1e3	139	struct sk_buff *skb2;
867a5943	140	bool unicast = true;
78851988	141	u16 vid = 0;
1da177e4	142
b3f1be4b SH	143	if (!p \|\| p->state == BR_STATE_DISABLED)
	144	goto drop;
	145
907b1e6e	146	if (!br_allowed_ingress(p->br, nbp_vlan_group_rcu(p), skb, &vid))
eb707618	147	goto out;
a37b85c9	148
85967bb4	149	/* insert into forwarding database after filtering to avoid spoofing */
b3f1be4b	150	br = p->br;
9ba18891	151	if (p->flags & BR_LEARNING)
a5642ab4	152	br_fdb_update(br, p, eth_hdr(skb)->h_source, vid, false);
85967bb4	153
44661462	154	if (!is_broadcast_ether_addr(dest) && is_multicast_ether_addr(dest) &&
06499098	155	br_multicast_rcv(br, p, skb, vid))
c4fcb78c HX	156	goto drop;
c4fcb78c HX	157
b3f1be4b SH	158	if (p->state == BR_STATE_LEARNING)
b3f1be4b SH	159	goto drop;
0e5eabac	160
68b7c895 HX	161	BR_INPUT_SKB_CB(skb)->brdev = br->dev;
68b7c895 HX	162
e081e1e3 HX	163	/* The packet skb2 goes to the local host (NULL to skip). */
e081e1e3 HX	164	skb2 = NULL;
1da177e4	165
e081e1e3 HX	166	if (br->dev->flags & IFF_PROMISC)
	167	skb2 = skb;
	168
	169	dst = NULL;
1da177e4	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
842a9ae0	174	if (is_broadcast_ether_addr(dest)) {
44661462	175	skb2 = skb;
867a5943 VY	176	unicast = false;
867a5943 VY	177	} else if (is_multicast_ether_addr(dest)) {
fbca58a2	178	mdst = br_mdb_get(br, skb, vid);
b00589af	179	if ((mdst \|\| BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
cc0fdd80	180	br_multicast_querier_exists(br, eth_hdr(skb))) {
8a870178	181	if ((mdst && mdst->mglist) \|\|
c4fcb78c HX	182	br_multicast_is_router(br))
	183	skb2 = skb;
	184	br_multicast_forward(mdst, skb, skb2);
	185	skb = NULL;
	186	if (!skb2)
	187	goto out;
	188	} else
	189	skb2 = skb;
	190
867a5943	191	unicast = false;
a339f1c8	192	br->dev->stats.multicast++;
2ba071ec VY	193	} else if ((dst = __br_fdb_get(br, dest, vid)) &&
2ba071ec VY	194	dst->is_local) {
e081e1e3 HX	195	skb2 = skb;
	196	/* Do not forward the packet since it's local. */
	197	skb = NULL;
1da177e4 LT	198	}
1da177e4 LT	199
e081e1e3	200	if (skb) {
7cd8861a	201	if (dst) {
7cd8861a	202	dst->used = jiffies;
7f7708f0	203	br_forward(dst->dst, skb, skb2);
7cd8861a	204	} else
867a5943	205	br_flood_forward(br, skb, skb2, unicast);
e081e1e3	206	}
1da177e4	207
87557c18	208	if (skb2)
68b7c895	209	return br_pass_frame_up(skb2);
87557c18	210
1da177e4 LT	211	out:
1da177e4 LT	212	return 0;
b3f1be4b SH	213	drop:
	214	kfree_skb(skb);
	215	goto out;
1da177e4	216	}
34666d46	217	EXPORT_SYMBOL_GPL(br_handle_frame_finish);
1da177e4	218
56fae404	219	static void __br_handle_local_finish(struct sk_buff *skb)
cf0f02d0	220	{
f350a0a8	221	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
2ba071ec	222	u16 vid = 0;
cf0f02d0	223
e0d7968a TM	224	/* check if vlan is allowed, to avoid spoofing */
e0d7968a TM	225	if (p->flags & BR_LEARNING && br_should_learn(p, skb, &vid))
a5642ab4	226	br_fdb_update(p->br, p, eth_hdr(skb)->h_source, vid, false);
56fae404 IS	227	}
	228
	229	/* note: already called with rcu_read_lock */
	230	static int br_handle_local_finish(struct net net, struct sock sk, struct sk_buff *skb)
	231	{
	232	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
	233
	234	__br_handle_local_finish(skb);
8626c56c FW	235
	236	BR_INPUT_SKB_CB(skb)->brdev = p->br->dev;
	237	br_pass_frame_up(skb);
	238	return 0;
cf0f02d0 SH	239	}
cf0f02d0 SH	240
1da177e4	241	/*
6229e362	242	* Return NULL if skb is handled
eeaf61d8	243	* note: already called with rcu_read_lock
1da177e4	244	*/
8a4eb573	245	rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
1da177e4	246	{
ab95bfe0	247	struct net_bridge_port *p;
8a4eb573	248	struct sk_buff skb = pskb;
1da177e4	249	const unsigned char *dest = eth_hdr(skb)->h_dest;
a386f990	250	br_should_route_hook_t *rhook;
1da177e4	251
c2368e79	252	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
8a4eb573	253	return RX_HANDLER_PASS;
ab95bfe0	254
1da177e4	255	if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
467aea0d	256	goto drop;
1da177e4	257
7b995651 HX	258	skb = skb_share_check(skb, GFP_ATOMIC);
7b995651 HX	259	if (!skb)
8a4eb573	260	return RX_HANDLER_CONSUMED;
7b995651	261
f350a0a8	262	p = br_port_get_rcu(skb->dev);
ab95bfe0	263
46acc460	264	if (unlikely(is_link_local_ether_addr(dest))) {
f2808d22 TM	265	u16 fwd_mask = p->br->group_fwd_mask_required;
f2808d22 TM	266
515853cc	267	/*
	268	* See IEEE 802.1D Table 7-10 Reserved addresses
	269	*
	270	* Assignment Value
	271	* Bridge Group Address 01-80-C2-00-00-00
	272	* (MAC Control) 802.3 01-80-C2-00-00-01
	273	* (Link Aggregation) 802.3 01-80-C2-00-00-02
	274	* 802.1X PAE address 01-80-C2-00-00-03
	275	*
	276	* 802.1AB LLDP 01-80-C2-00-00-0E
	277	*
	278	* Others reserved for future standardization
	279	*/
	280	switch (dest[5]) {
	281	case 0x00: /* Bridge Group Address */
	282	/* If STP is turned off,
	283	then must forward to keep loop detection */
f2808d22 TM	284	if (p->br->stp_enabled == BR_NO_STP \|\|
f2808d22 TM	285	fwd_mask & (1u << dest[5]))
515853cc	286	goto forward;
56fae404 IS	287	*pskb = skb;
	288	__br_handle_local_finish(skb);
	289	return RX_HANDLER_PASS;
515853cc	290
515853cc	291	case 0x01: /* IEEE MAC (Pause) */
2111f8b9 SH	292	goto drop;
2111f8b9 SH	293
515853cc	294	default:
515853cc	295	/* Allow selective forwarding for most other protocols */
f2808d22 TM	296	fwd_mask \|= p->br->group_fwd_mask;
f2808d22 TM	297	if (fwd_mask & (1u << dest[5]))
515853cc	298	goto forward;
515853cc	299	}
a598f6ae	300
515853cc	301	/* Deliver packet to local host only */
8626c56c FW	302	NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, dev_net(skb->dev),
	303	NULL, skb, skb->dev, NULL, br_handle_local_finish);
	304	return RX_HANDLER_CONSUMED;
2111f8b9	305	}
1da177e4	306
a598f6ae	307	forward:
467aea0d SH	308	switch (p->state) {
467aea0d SH	309	case BR_STATE_FORWARDING:
82de382c	310	rhook = rcu_dereference(br_should_route_hook);
a386f990	311	if (rhook) {
8a4eb573 JP	312	if ((*rhook)(skb)) {
	313	*pskb = skb;
	314	return RX_HANDLER_PASS;
	315	}
1da177e4 LT	316	dest = eth_hdr(skb)->h_dest;
1da177e4 LT	317	}
467aea0d SH	318	/* fall through */
467aea0d SH	319	case BR_STATE_LEARNING:
9a7b6ef9	320	if (ether_addr_equal(p->br->dev->dev_addr, dest))
1da177e4 LT	321	skb->pkt_type = PACKET_HOST;
1da177e4 LT	322
29a26a56 EB	323	NF_HOOK(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING,
29a26a56 EB	324	dev_net(skb->dev), NULL, skb, skb->dev, NULL,
1da177e4	325	br_handle_frame_finish);
467aea0d SH	326	break;
	327	default:
	328	drop:
	329	kfree_skb(skb);
1da177e4	330	}
8a4eb573	331	return RX_HANDLER_CONSUMED;
1da177e4	332	}