Release 4.14 net/bridge/br_forward.c

/*
 *      Forwarding decision
 *      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/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_allowed_egress(vg, skb) && p->state == BR_STATE_FORWARDING &&
		nbp_switchdev_allowed_egress(p, skb);
}

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Linus Torvalds (pre-git)
27
38.57%
1
11.11%
Nikolay Aleksandrov
13
18.57%
2
22.22%
Fischer, Anna
9
12.86%
1
11.11%
Stephen Hemminger
7
10.00%
2
22.22%
Ido Schimmel
7
10.00%
1
11.11%
Vlad Yasevich
6
8.57%
1
11.11%
Linus Torvalds
1
1.43%
1
11.11%
Total
70
100.00%
9
100.00%



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

	skb_push(skb, ETH_HLEN);
	br_drop_fake_rtable(skb);

	if (skb->ip_summed == CHECKSUM_PARTIAL &&
	    (skb->protocol == htons(ETH_P_8021Q) ||
	     skb->protocol == htons(ETH_P_8021AD))) {
		int depth;

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

		skb_set_network_header(skb, depth);
	}

	dev_queue_xmit(skb);

	return 0;

drop:
	kfree_skb(skb);
	return 0;
}
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Toshiaki Makita
71
57.72%
1
10.00%
Linus Torvalds
23
18.70%
1
10.00%
Stephen Hemminger
8
6.50%
2
20.00%
David S. Miller
5
4.07%
1
10.00%
Peter Huang (Peng)
5
4.07%
1
10.00%
Eric W. Biedermann
5
4.07%
1
10.00%
Vlad Yasevich
3
2.44%
1
10.00%
Vlad Drukker
2
1.63%
1
10.00%
Bart De Schuymer
1
0.81%
1
10.00%
Total
123
100.00%
10
100.00%


EXPORT_SYMBOL_GPL(br_dev_queue_push_xmit);



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

}
Contributors
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CommitProp
Linus Torvalds
24
57.14%
1
14.29%
David S. Miller
7
16.67%
1
14.29%
Eric W. Biedermann
7
16.67%
2
28.57%
Bart De Schuymer
2
4.76%
1
14.29%
Jan Engelhardt
1
2.38%
1
14.29%
Stephen Hemminger
1
2.38%
1
14.29%
Total
42
100.00%
7
100.00%


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;

	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))) {
			if (!is_skb_forwardable(skb->dev, skb)) {
				kfree_skb(skb);
			} else {
				skb_push(skb, ETH_HLEN);
				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);
}

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Nikolay Aleksandrov
97
45.75%
3
21.43%
Herbert Xu
35
16.51%
1
7.14%
Linus Torvalds
27
12.74%
1
7.14%
Vlad Yasevich
21
9.91%
2
14.29%
Américo Wang
19
8.96%
2
14.29%
Eric W. Biedermann
7
3.30%
1
7.14%
David S. Miller
2
0.94%
1
7.14%
Roopa Prabhu
2
0.94%
1
7.14%
Stephen Hemminger
1
0.47%
1
7.14%
Bart De Schuymer
1
0.47%
1
7.14%
Total
212
100.00%
14
100.00%



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.tx_dropped++;
		return -ENOMEM;
	}

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

Contributors
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Nikolay Aleksandrov
31
43.66%
2
28.57%
Linus Torvalds (pre-git)
16
22.54%
1
14.29%
Linus Torvalds
10
14.08%
1
14.29%
Vlad Yasevich
9
12.68%
1
14.29%
Herbert Xu
4
5.63%
1
14.29%
Stephen Hemminger
1
1.41%
1
14.29%
Total
71
100.00%
7
100.00%

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

	if (!local_rcv)
		kfree_skb(skb);
}
Contributors
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CommitProp
Nikolay Aleksandrov
30
43.48%
2
22.22%
Herbert Xu
17
24.64%
2
22.22%
Linus Torvalds (pre-git)
17
24.64%
1
11.11%
Roopa Prabhu
2
2.90%
1
11.11%
Stephen Hemminger
1
1.45%
1
11.11%
Michael Braun
1
1.45%
1
11.11%
Linus Torvalds
1
1.45%
1
11.11%
Total
69
100.00%
9
100.00%


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)
{
	int err;

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

	if (!prev)
		goto out;

	err = deliver_clone(prev, skb, local_orig);
	if (err)
		return ERR_PTR(err);

out:
	return p;
}

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Herbert Xu
73
96.05%
1
50.00%
Nikolay Aleksandrov
3
3.95%
1
50.00%
Total
76
100.00%
2
100.00%

/* 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)
{
	u8 igmp_type = br_multicast_igmp_type(skb);
	struct net_bridge_port *prev = NULL;
	struct net_bridge_port *p;

	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 ((p->flags & BR_PROXYARP_WIFI) &&
		    BR_INPUT_SKB_CB(skb)->proxyarp_replied)
			continue;

		prev = maybe_deliver(prev, p, skb, local_orig);
		if (IS_ERR(prev))
			goto out;
		if (prev == p)
			br_multicast_count(p->br, p, skb, igmp_type,
					   BR_MCAST_DIR_TX);
	}

	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(skb);
}

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61
25.21%
6
37.50%
Linus Torvalds (pre-git)
51
21.07%
1
6.25%
Mike Manning
46
19.01%
2
12.50%
Herbert Xu
35
14.46%
2
12.50%
Jouni Malinen
18
7.44%
1
6.25%
Vlad Yasevich
13
5.37%
1
6.25%
Kyeyoon Park
10
4.13%
1
6.25%
Stephen Hemminger
8
3.31%
2
12.50%
Total
242
100.00%
16
100.00%

#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;

	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 = skb_copy(skb, GFP_ATOMIC);
	if (!skb) {
		dev->stats.tx_dropped++;
		return;
	}

	if (!is_broadcast_ether_addr(addr))
		memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);

	__br_forward(p, skb, local_orig);
}

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1
100.00%

/* called with rcu_read_lock */


void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
			struct sk_buff *skb,
			bool local_rcv, bool local_orig)
{
	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
	u8 igmp_type = br_multicast_igmp_type(skb);
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_port *prev = NULL;
	struct net_bridge_port_group *p;
	struct hlist_node *rp;

	rp = rcu_dereference(hlist_first_rcu(&br->router_list));
	p = mdst ? rcu_dereference(mdst->ports) : NULL;
	while (p || rp) {
		struct net_bridge_port *port, *lport, *rport;

		lport = p ? p->port : NULL;
		rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) :
			     NULL;

		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;
			}
		} else {
			port = rport;
		}

		prev = maybe_deliver(prev, port, skb, local_orig);
delivered:
		if (IS_ERR(prev))
			goto out;
		if (prev == port)
			br_multicast_count(port->br, port, skb, igmp_type,
					   BR_MCAST_DIR_TX);

		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(skb);
}
Contributors
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Herbert Xu
215
65.35%
1
10.00%
Nikolay Aleksandrov
41
12.46%
4
40.00%
Felix Fietkau
41
12.46%
1
10.00%
Stephen Hemminger
25
7.60%
3
30.00%
Eric Dumazet
7
2.13%
1
10.00%
Total
329
100.00%
10
100.00%

#endif
Overall Contributors
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Herbert Xu
388
27.30%
6
10.91%
Nikolay Aleksandrov
283
19.92%
8
14.55%
Arnd Bergmann
135
9.50%
1
1.82%
Linus Torvalds (pre-git)
123
8.66%
1
1.82%
Linus Torvalds
89
6.26%
2
3.64%
Toshiaki Makita
71
5.00%
1
1.82%
Stephen Hemminger
55
3.87%
8
14.55%
Vlad Yasevich
52
3.66%
4
7.27%
Mike Manning
46
3.24%
2
3.64%
Felix Fietkau
41
2.89%
1
1.82%
Américo Wang
22
1.55%
2
3.64%
Eric W. Biedermann
19
1.34%
2
3.64%
Jouni Malinen
18
1.27%
1
1.82%
David S. Miller
14
0.99%
1
1.82%
Pablo Neira Ayuso
10
0.70%
1
1.82%
Kyeyoon Park
10
0.70%
1
1.82%
Fischer, Anna
9
0.63%
1
1.82%
Eric Dumazet
7
0.49%
1
1.82%
Ido Schimmel
7
0.49%
1
1.82%
Peter Huang (Peng)
5
0.35%
1
1.82%
Roopa Prabhu
4
0.28%
2
3.64%
Bart De Schuymer
4
0.28%
1
1.82%
Tejun Heo
3
0.21%
1
1.82%
Vlad Drukker
2
0.14%
1
1.82%
Jan Engelhardt
1
0.07%
1
1.82%
Adrian Bunk
1
0.07%
1
1.82%
Tan Xiaojun
1
0.07%
1
1.82%
Michael Braun
1
0.07%
1
1.82%
Total
1421
100.00%
55
100.00%
Directory: net/bridge

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