Release 4.8 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);
}

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eric w. biederman
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27
100.00%
2
100.00%



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);
}

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vlad yasevich
vlad yasevich
63
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3
17.65%
nikolay aleksandrov
nikolay aleksandrov
27
14.21%
3
17.65%
pre-git
pre-git
24
12.63%
1
5.88%
stephen hemminger
stephen hemminger
21
11.05%
1
5.88%
eric dumazet
eric dumazet
16
8.42%
1
5.88%
linus torvalds
linus torvalds
13
6.84%
1
5.88%
pavel emelianov
pavel emelianov
8
4.21%
1
5.88%
herbert xu
herbert xu
8
4.21%
1
5.88%
eric w. biederman
eric w. biederman
6
3.16%
2
11.76%
david s. miller
david s. miller
2
1.05%
1
5.88%
li rongqing
li rongqing
1
0.53%
1
5.88%
jan engelhardt
jan engelhardt
1
0.53%
1
5.88%
Total
190
100.00%
17
100.00%



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);
	}
}

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kyeyoon park
kyeyoon park
277
83.69%
1
33.33%
jouni malinen
jouni malinen
51
15.41%
1
33.33%
nikolay aleksandrov
nikolay aleksandrov
3
0.91%
1
33.33%
Total
331
100.00%
3
100.00%

/* note: already called with rcu_read_lock */


int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	bool local_rcv = false, mcast_hit = false, unicast = true;
	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
	const unsigned char *dest = eth_hdr(skb)->h_dest;
	struct net_bridge_fdb_entry *dst = NULL;
	struct net_bridge_mdb_entry *mdst;
	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;

	/* 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;

	local_rcv = !!(br->dev->flags & IFF_PROMISC);

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

	if (dst) {
		dst->used = jiffies;
		br_forward(dst->dst, skb, local_rcv, false);
	} else {
		if (!mcast_hit)
			br_flood(br, skb, unicast, 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;
}
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herbert xu
herbert xu
109
23.34%
6
13.64%
nikolay aleksandrov
nikolay aleksandrov
101
21.63%
6
13.64%
stephen hemminger
stephen hemminger
84
17.99%
8
18.18%
pre-git
pre-git
56
11.99%
2
4.55%
vlad yasevich
vlad yasevich
39
8.35%
6
13.64%
kyeyoon park
kyeyoon park
18
3.85%
1
2.27%
linus lussing
linus lussing
12
2.57%
2
4.55%
jouni malinen
jouni malinen
10
2.14%
1
2.27%
linus torvalds
linus torvalds
9
1.93%
1
2.27%
david s. miller
david s. miller
5
1.07%
1
2.27%
arnd bergmann
arnd bergmann
5
1.07%
1
2.27%
eric w. biederman
eric w. biederman
5
1.07%
1
2.27%
toshiaki makita
toshiaki makita
3
0.64%
2
4.55%
kris katterjohn
kris katterjohn
3
0.64%
1
2.27%
pavel emelianov
pavel emelianov
3
0.64%
1
2.27%
americo wang
americo wang
2
0.43%
1
2.27%
michael braun
michael braun
1
0.21%
1
2.27%
hideaki yoshifuji
hideaki yoshifuji
1
0.21%
1
2.27%
jiri pirko
jiri pirko
1
0.21%
1
2.27%
Total
467
100.00%
44
100.00%


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);
}

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stephen hemminger
35
52.24%
1
14.29%
vlad yasevich
vlad yasevich
15
22.39%
2
28.57%
toshiaki makita
toshiaki makita
13
19.40%
2
28.57%
ido schimmel
ido schimmel
3
4.48%
1
14.29%
jiri pirko
jiri pirko
1
1.49%
1
14.29%
Total
67
100.00%
7
100.00%

/* 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;
}

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ido schimmel
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1
33.33%
florian westphal
florian westphal
18
30.51%
1
33.33%
stephen hemminger
stephen hemminger
4
6.78%
1
33.33%
Total
59
100.00%
3
100.00%

/*
 * 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;
}
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stephen hemminger
112
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33.33%
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ido schimmel
54
13.78%
2
5.56%
jiri pirko
jiri pirko
49
12.50%
3
8.33%
linus torvalds
linus torvalds
45
11.48%
2
5.56%
bart de schuymer
bart de schuymer
27
6.89%
3
8.33%
toshiaki makita
toshiaki makita
26
6.63%
1
2.78%
herbert xu
herbert xu
16
4.08%
1
2.78%
eric w. biederman
eric w. biederman
14
3.57%
1
2.78%
pavel emelianov
pavel emelianov
11
2.81%
1
2.78%
arnaldo carvalho de melo
arnaldo carvalho de melo
9
2.30%
1
2.78%
david s. miller
david s. miller
8
2.04%
2
5.56%
pre-git
pre-git
8
2.04%
1
2.78%
eric dumazet
eric dumazet
5
1.28%
1
2.78%
simon horman
simon horman
3
0.77%
1
2.78%
jan engelhardt
jan engelhardt
2
0.51%
1
2.78%
ben hutchings
ben hutchings
1
0.26%
1
2.78%
florian westphal
florian westphal
1
0.26%
1
2.78%
joe perches
joe perches
1
0.26%
1
2.78%
Total
392
100.00%
36
100.00%

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kyeyoon park
kyeyoon park
301
19.00%
1
1.11%
stephen hemminger
stephen hemminger
257
16.22%
20
22.22%
herbert xu
herbert xu
133
8.40%
7
7.78%
nikolay aleksandrov
nikolay aleksandrov
131
8.27%
9
10.00%
vlad yasevich
vlad yasevich
120
7.58%
8
8.89%
pre-git
pre-git
100
6.31%
2
2.22%
ido schimmel
ido schimmel
95
6.00%
2
2.22%
linus torvalds
linus torvalds
70
4.42%
2
2.22%
jouni malinen
jouni malinen
61
3.85%
1
1.11%
eric w. biederman
eric w. biederman
52
3.28%
3
3.33%
jiri pirko
jiri pirko
51
3.22%
3
3.33%
toshiaki makita
toshiaki makita
42
2.65%
4
4.44%
eric dumazet
eric dumazet
33
2.08%
2
2.22%
bart de schuymer
bart de schuymer
27
1.70%
3
3.33%
pavel emelianov
pavel emelianov
22
1.39%
2
2.22%
florian westphal
florian westphal
19
1.20%
1
1.11%
david s. miller
david s. miller
16
1.01%
3
3.33%
linus lussing
linus lussing
12
0.76%
2
2.22%
arnaldo carvalho de melo
arnaldo carvalho de melo
9
0.57%
1
1.11%
pablo neira ayuso
pablo neira ayuso
5
0.32%
1
1.11%
arnd bergmann
arnd bergmann
5
0.32%
1
1.11%
tejun heo
tejun heo
3
0.19%
1
1.11%
jan engelhardt
jan engelhardt
3
0.19%
1
1.11%
kris katterjohn
kris katterjohn
3
0.19%
1
1.11%
paul gortmaker
paul gortmaker
3
0.19%
1
1.11%
simon horman
simon horman
3
0.19%
1
1.11%
americo wang
americo wang
2
0.13%
1
1.11%
adrian bunk
adrian bunk
1
0.06%
1
1.11%
ben hutchings
ben hutchings
1
0.06%
1
1.11%
michael braun
michael braun
1
0.06%
1
1.11%
hideaki yoshifuji
hideaki yoshifuji
1
0.06%
1
1.11%
joe perches
joe perches
1
0.06%
1
1.11%
li rongqing
li rongqing
1
0.06%
1
1.11%
Total
1584
100.00%
90
100.00%
  
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