cregit-Linux how code gets into the kernel

Release 4.7 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"

static int deliver_clone(const struct net_bridge_port *prev,
			 struct sk_buff *skb,
			 void (*__packet_hook)(const struct net_bridge_port *p,
					       struct sk_buff *skb));

/* 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
PersonTokensPropCommitsCommitProp
pre-gitpre-git2742.86%112.50%


nikolay aleksandrovnikolay aleksandrov1320.63%225.00%


anna fischeranna fischer914.29%112.50%


stephen hemmingerstephen hemminger711.11%225.00%


vlad yasevichvlad yasevich69.52%112.50%


linus torvaldslinus torvalds11.59%112.50%


Total63100.00%8100.00%






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
PersonTokensPropCommitsCommitProp
toshiaki makitatoshiaki makita7157.72%110.00%


linus torvaldslinus torvalds2318.70%110.00%


stephen hemmingerstephen hemminger86.50%220.00%


peter huangpeter huang54.07%110.00%


david s. millerdavid s. miller54.07%110.00%


eric w. biedermaneric w. biederman54.07%110.00%


vlad yasevichvlad yasevich32.44%110.00%


vlad drukkervlad drukker21.63%110.00%


bart de schuymerbart de schuymer10.81%110.00%


Total123100.00%10100.00%




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
PersonTokensPropCommitsCommitProp
linus torvaldslinus torvalds2457.14%114.29%


eric w. biedermaneric w. biederman716.67%228.57%


david s. millerdavid s. miller716.67%114.29%


bart de schuymerbart de schuymer24.76%114.29%


jan engelhardtjan engelhardt12.38%114.29%


stephen hemmingerstephen hemminger12.38%114.29%


Total42100.00%7100.00%




EXPORT_SYMBOL_GPL(br_forward_finish);




static void __br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
{
	struct net_bridge_vlan_group *vg;

	vg = nbp_vlan_group_rcu(to);
	skb = br_handle_vlan(to->br, vg, skb);
	if (!skb)
		return;

	skb->dev = to->dev;

	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;
	}

	NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
		dev_net(skb->dev), NULL, skb,NULL, skb->dev,
		br_forward_finish);
}


Contributors
PersonTokensPropCommitsCommitProp
herbert xuherbert xu3526.32%17.14%


linus torvaldslinus torvalds3224.06%17.14%


vlad yasevichvlad yasevich2115.79%214.29%


americo wangamerico wang1914.29%214.29%


nikolay aleksandrovnikolay aleksandrov139.77%214.29%


eric w. biedermaneric w. biederman75.26%17.14%


david s. millerdavid s. miller21.50%17.14%


stephen hemmingerstephen hemminger10.75%17.14%


lennert buytenheklennert buytenhek10.75%17.14%


jan engelhardtjan engelhardt10.75%17.14%


bart de schuymerbart de schuymer10.75%17.14%


Total133100.00%14100.00%






static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
{
	struct net_bridge_vlan_group *vg;
	struct net_device *indev;

	if (skb_warn_if_lro(skb)) {
		kfree_skb(skb);
		return;
	}

	vg = nbp_vlan_group_rcu(to);
	skb = br_handle_vlan(to->br, vg, skb);
	if (!skb)
		return;

	indev = skb->dev;
	skb->dev = to->dev;
	skb_forward_csum(skb);

	NF_HOOK(NFPROTO_BRIDGE, NF_BR_FORWARD,
		dev_net(indev), NULL, skb, indev, skb->dev,
		br_forward_finish);
}


Contributors
PersonTokensPropCommitsCommitProp
linus torvaldslinus torvalds2724.32%17.69%


pre-gitpre-git2320.72%17.69%


herbert xuherbert xu1816.22%215.38%


vlad yasevichvlad yasevich1816.22%17.69%


nikolay aleksandrovnikolay aleksandrov1311.71%215.38%


eric w. biedermaneric w. biederman54.50%17.69%


stephen hemmingerstephen hemminger32.70%215.38%


david s. millerdavid s. miller21.80%17.69%


bart de schuymerbart de schuymer10.90%17.69%


jan engelhardtjan engelhardt10.90%17.69%


Total111100.00%13100.00%



/* called with rcu_read_lock */



void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
{
	if (to && should_deliver(to, skb)) {
		__br_deliver(to, skb);
		return;
	}

	kfree_skb(skb);
}

Contributors
PersonTokensPropCommitsCommitProp
linus torvaldslinus torvalds3480.95%125.00%


pre-gitpre-git511.90%125.00%


stephen hemmingerstephen hemminger37.14%250.00%


Total42100.00%4100.00%




EXPORT_SYMBOL_GPL(br_deliver);

/* called with rcu_read_lock */



void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, struct sk_buff *skb0)
{
	if (to && should_deliver(to, skb)) {
		if (skb0)
			deliver_clone(to, skb, __br_forward);
		else
			__br_forward(to, skb);
		return;
	}

	if (!skb0)
		kfree_skb(skb);
}


Contributors
PersonTokensPropCommitsCommitProp
pre-gitpre-git3857.58%120.00%


michael braunmichael braun2436.36%120.00%


roopa prabhuroopa prabhu23.03%120.00%


stephen hemmingerstephen hemminger11.52%120.00%


linus torvaldslinus torvalds11.52%120.00%


Total66100.00%5100.00%






static int deliver_clone(const struct net_bridge_port *prev,
			 struct sk_buff *skb,
			 void (*__packet_hook)(const struct net_bridge_port *p,
					       struct sk_buff *skb))
{
	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;

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

	__packet_hook(prev, skb);
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
herbert xuherbert xu8398.81%266.67%


david s. millerdavid s. miller11.19%133.33%


Total84100.00%3100.00%






static struct net_bridge_port *maybe_deliver(
	struct net_bridge_port *prev, struct net_bridge_port *p,
	struct sk_buff *skb,
	void (*__packet_hook)(const struct net_bridge_port *p,
			      struct sk_buff *skb))
{
	int err;

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

	if (!prev)
		goto out;

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

out:
	return p;
}


Contributors
PersonTokensPropCommitsCommitProp
herbert xuherbert xu91100.00%1100.00%


Total91100.00%1100.00%



/* called under bridge lock */



static void br_flood(struct net_bridge *br, struct sk_buff *skb,
		     struct sk_buff *skb0,
		     void (*__packet_hook)(const struct net_bridge_port *p,
					   struct sk_buff *skb),
		     bool unicast)
{
	struct net_bridge_port *p;
	struct net_bridge_port *prev;

	prev = NULL;

	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, __packet_hook);
		if (IS_ERR(prev))
			goto out;
	}

	if (!prev)
		goto out;

	if (skb0)
		deliver_clone(prev, skb, __packet_hook);
	else
		__packet_hook(prev, skb);
	return;

out:
	if (!skb0)
		kfree_skb(skb);
}



Contributors
PersonTokensPropCommitsCommitProp
pre-gitpre-git5732.76%111.11%


herbert xuherbert xu4425.29%222.22%


jouni malinenjouni malinen1810.34%111.11%


linus torvaldslinus torvalds1810.34%111.11%


vlad yasevichvlad yasevich1810.34%111.11%


kyeyoon parkkyeyoon park105.75%111.11%


stephen hemmingerstephen hemminger95.17%222.22%


Total174100.00%9100.00%



/* called with rcu_read_lock */



void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast)
{
	br_flood(br, skb, NULL, __br_deliver, unicast);
}


Contributors
PersonTokensPropCommitsCommitProp
linus torvaldslinus torvalds2477.42%133.33%


vlad yasevichvlad yasevich516.13%133.33%


herbert xuherbert xu26.45%133.33%


Total31100.00%3100.00%



/* called under bridge lock */



void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
		      struct sk_buff *skb2, bool unicast)
{
	br_flood(br, skb, skb2, __br_forward, unicast);
}


Contributors
PersonTokensPropCommitsCommitProp
linus torvaldslinus torvalds2466.67%133.33%


herbert xuherbert xu719.44%133.33%


vlad yasevichvlad yasevich513.89%133.33%


Total36100.00%3100.00%



#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
/* called with rcu_read_lock */



static void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
			       struct sk_buff *skb, struct sk_buff *skb0,
			       void (*__packet_hook)(
					const struct net_bridge_port *p,
					struct sk_buff *skb))
{
	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
	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, __packet_hook);
		if (IS_ERR(prev))
			goto out;

		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 (skb0)
		deliver_clone(prev, skb, __packet_hook);
	else
		__packet_hook(prev, skb);
	return;

out:
	if (!skb0)
		kfree_skb(skb);
}


Contributors
PersonTokensPropCommitsCommitProp
herbert xuherbert xu24788.53%120.00%


stephen hemmingerstephen hemminger258.96%360.00%


eric dumazeteric dumazet72.51%120.00%


Total279100.00%5100.00%



/* called with rcu_read_lock */



void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
			  struct sk_buff *skb)
{
	br_multicast_flood(mdst, skb, NULL, __br_deliver);
}


Contributors
PersonTokensPropCommitsCommitProp
herbert xuherbert xu26100.00%1100.00%


Total26100.00%1100.00%



/* called with rcu_read_lock */



void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
			  struct sk_buff *skb, struct sk_buff *skb2)
{
	br_multicast_flood(mdst, skb, skb2, __br_forward);
}

Contributors
PersonTokensPropCommitsCommitProp
herbert xuherbert xu31100.00%1100.00%


Total31100.00%1100.00%



#endif

Overall Contributors
PersonTokensPropCommitsCommitProp
herbert xuherbert xu59541.81%714.29%


linus torvaldslinus torvalds21214.90%24.08%


pre-gitpre-git16311.45%12.04%


vlad yasevichvlad yasevich765.34%48.16%


toshiaki makitatoshiaki makita714.99%12.04%


stephen hemmingerstephen hemminger644.50%1020.41%


michael braunmichael braun574.01%12.04%


nikolay aleksandrovnikolay aleksandrov392.74%24.08%


eric w. biedermaneric w. biederman241.69%24.08%


americo wangamerico wang221.55%24.08%


david s. millerdavid s. miller181.26%24.08%


jouni malinenjouni malinen181.26%12.04%


pablo neira ayusopablo neira ayuso151.05%24.08%


kyeyoon parkkyeyoon park100.70%12.04%


anna fischeranna fischer90.63%12.04%


eric dumazeteric dumazet70.49%12.04%


peter huangpeter huang50.35%12.04%


bart de schuymerbart de schuymer50.35%12.04%


tejun heotejun heo30.21%12.04%


jan engelhardtjan engelhardt30.21%12.04%


vlad drukkervlad drukker20.14%12.04%


roopa prabhuroopa prabhu20.14%12.04%


adrian bunkadrian bunk10.07%12.04%


tan xiaojuntan xiaojun10.07%12.04%


lennert buytenheklennert buytenhek10.07%12.04%


Total1423100.00%49100.00%

  
Directory: net/bridge



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