Release 4.8 net/bridge/br_forward.c

Directory: net/bridge
/*
 *      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;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 27 42.86% 1 12.50%
nikolay aleksandrov nikolay aleksandrov 13 20.63% 2 25.00%
anna fischer anna fischer 9 14.29% 1 12.50%
stephen hemminger stephen hemminger 7 11.11% 2 25.00%
vlad yasevich vlad yasevich 6 9.52% 1 12.50%
linus torvalds linus torvalds 1 1.59% 1 12.50%
Total 63 100.00% 8 100.00%



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;
}
Contributors
Person Tokens Prop Commits CommitProp
toshiaki makita toshiaki makita 71 57.72% 1 10.00%
linus torvalds linus torvalds 23 18.70% 1 10.00%
stephen hemminger stephen hemminger 8 6.50% 2 20.00%
eric w. biederman eric w. biederman 5 4.07% 1 10.00%
david s. miller david s. miller 5 4.07% 1 10.00%
peter huang peter huang 5 4.07% 1 10.00%
vlad yasevich vlad yasevich 3 2.44% 1 10.00%
vlad drukker vlad drukker 2 1.63% 1 10.00%
bart de schuymer 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
Person Tokens Prop Commits CommitProp
linus torvalds linus torvalds 24 57.14% 1 14.29%
eric w. biederman eric w. biederman 7 16.67% 2 28.57%
david s. miller david s. miller 7 16.67% 1 14.29%
bart de schuymer bart de schuymer 2 4.76% 1 14.29%
jan engelhardt jan engelhardt 1 2.38% 1 14.29%
stephen hemminger 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, 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);
}

Contributors
Person Tokens Prop Commits CommitProp
nikolay aleksandrov nikolay aleksandrov 97 46.19% 3 23.08%
herbert xu herbert xu 35 16.67% 1 7.69%
linus torvalds linus torvalds 27 12.86% 1 7.69%
vlad yasevich vlad yasevich 21 10.00% 2 15.38%
americo wang americo wang 19 9.05% 2 15.38%
eric w. biederman eric w. biederman 7 3.33% 1 7.69%
david s. miller david s. miller 2 0.95% 1 7.69%
stephen hemminger stephen hemminger 1 0.48% 1 7.69%
bart de schuymer bart de schuymer 1 0.48% 1 7.69%
Total 210 100.00% 13 100.00%



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
Person Tokens Prop Commits CommitProp
nikolay aleksandrov nikolay aleksandrov 31 43.66% 2 28.57%
pre-git pre-git 16 22.54% 1 14.29%
linus torvalds linus torvalds 10 14.08% 1 14.29%
vlad yasevich vlad yasevich 9 12.68% 1 14.29%
herbert xu herbert xu 4 5.63% 1 14.29%
stephen hemminger 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
Person Tokens Prop Commits CommitProp
nikolay aleksandrov nikolay aleksandrov 30 43.48% 2 25.00%
herbert xu herbert xu 19 27.54% 2 25.00%
pre-git pre-git 16 23.19% 1 12.50%
roopa prabhu roopa prabhu 2 2.90% 1 12.50%
michael braun michael braun 1 1.45% 1 12.50%
stephen hemminger stephen hemminger 1 1.45% 1 12.50%
Total 69 100.00% 8 100.00%


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;
}

Contributors
Person Tokens Prop Commits CommitProp
herbert xu herbert xu 73 96.05% 1 50.00%
nikolay aleksandrov 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,
	      bool unicast, 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 */
		if (unicast && !(p->flags & BR_FLOOD))
			continue;

		/* 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);
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 51 27.57% 1 8.33%
nikolay aleksandrov nikolay aleksandrov 46 24.86% 4 33.33%
herbert xu herbert xu 35 18.92% 2 16.67%
jouni malinen jouni malinen 18 9.73% 1 8.33%
vlad yasevich vlad yasevich 17 9.19% 1 8.33%
kyeyoon park kyeyoon park 10 5.41% 1 8.33%
stephen hemminger stephen hemminger 8 4.32% 2 16.67%
Total 185 100.00% 12 100.00%

#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
/* 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;

		port = (unsigned long)lport > (unsigned long)rport ?
		       lport : rport;

		prev = maybe_deliver(prev, port, skb, local_orig);
		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
Person Tokens Prop Commits CommitProp
herbert xu herbert xu 219 75.00% 1 11.11%
nikolay aleksandrov nikolay aleksandrov 41 14.04% 4 44.44%
stephen hemminger stephen hemminger 25 8.56% 3 33.33%
eric dumazet eric dumazet 7 2.40% 1 11.11%
Total 292 100.00% 9 100.00%

#endif
Overall Contributors
Person Tokens Prop Commits CommitProp
herbert xu herbert xu 394 33.31% 6 12.77%
nikolay aleksandrov nikolay aleksandrov 268 22.65% 6 12.77%
pre-git pre-git 122 10.31% 1 2.13%
linus torvalds linus torvalds 88 7.44% 2 4.26%
toshiaki makita toshiaki makita 71 6.00% 1 2.13%
vlad yasevich vlad yasevich 56 4.73% 4 8.51%
stephen hemminger stephen hemminger 55 4.65% 8 17.02%
americo wang americo wang 22 1.86% 2 4.26%
eric w. biederman eric w. biederman 19 1.61% 2 4.26%
jouni malinen jouni malinen 18 1.52% 1 2.13%
david s. miller david s. miller 14 1.18% 1 2.13%
kyeyoon park kyeyoon park 10 0.85% 1 2.13%
pablo neira ayuso pablo neira ayuso 10 0.85% 1 2.13%
anna fischer anna fischer 9 0.76% 1 2.13%
eric dumazet eric dumazet 7 0.59% 1 2.13%
peter huang peter huang 5 0.42% 1 2.13%
bart de schuymer bart de schuymer 4 0.34% 1 2.13%
tejun heo tejun heo 3 0.25% 1 2.13%
roopa prabhu roopa prabhu 2 0.17% 1 2.13%
vlad drukker vlad drukker 2 0.17% 1 2.13%
michael braun michael braun 1 0.08% 1 2.13%
tan xiaojun tan xiaojun 1 0.08% 1 2.13%
jan engelhardt jan engelhardt 1 0.08% 1 2.13%
adrian bunk adrian bunk 1 0.08% 1 2.13%
Total 1183 100.00% 47 100.00%
  Directory: net/bridge

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
pre-git	pre-git	27	42.86%	1	12.50%
nikolay aleksandrov	nikolay aleksandrov	13	20.63%	2	25.00%
anna fischer	anna fischer	9	14.29%	1	12.50%
stephen hemminger	stephen hemminger	7	11.11%	2	25.00%
vlad yasevich	vlad yasevich	6	9.52%	1	12.50%
linus torvalds	linus torvalds	1	1.59%	1	12.50%
	Total	63	100.00%	8	100.00%
cregit-Linux how code gets into the kernel

Release 4.8 net/bridge/br_forward.c

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