cregit-Linux how code gets into the kernel

Release 4.11 net/bridge/br_netfilter_hooks.c

Directory: net/bridge
/*
 *      Handle firewalling
 *      Linux ethernet bridge
 *
 *      Authors:
 *      Lennert Buytenhek               <buytenh@gnu.org>
 *      Bart De Schuymer                <bdschuym@pandora.be>
 *
 *      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.
 *
 *      Lennert dedicates this file to Kerstin Wurdinger.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/ip.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/if_pppox.h>
#include <linux/ppp_defs.h>
#include <linux/netfilter_bridge.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netfilter_arp.h>
#include <linux/in_route.h>
#include <linux/rculist.h>
#include <linux/inetdevice.h>

#include <net/ip.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
#include <net/route.h>
#include <net/netfilter/br_netfilter.h>
#include <net/netns/generic.h>

#include <linux/uaccess.h>
#include "br_private.h"
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif


static unsigned int brnf_net_id __read_mostly;


struct brnf_net {
	
bool enabled;
};

#ifdef CONFIG_SYSCTL

static struct ctl_table_header *brnf_sysctl_header;

static int brnf_call_iptables __read_mostly = 1;

static int brnf_call_ip6tables __read_mostly = 1;

static int brnf_call_arptables __read_mostly = 1;

static int brnf_filter_vlan_tagged __read_mostly;

static int brnf_filter_pppoe_tagged __read_mostly;

static int brnf_pass_vlan_indev __read_mostly;
#else

#define brnf_call_iptables 1

#define brnf_call_ip6tables 1

#define brnf_call_arptables 1

#define brnf_filter_vlan_tagged 0

#define brnf_filter_pppoe_tagged 0

#define brnf_pass_vlan_indev 0
#endif


#define IS_IP(skb) \
	(!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IP))


#define IS_IPV6(skb) \
	(!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6))


#define IS_ARP(skb) \
	(!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_ARP))




static inline __be16 vlan_proto(const struct sk_buff *skb)
{
	if (skb_vlan_tag_present(skb))
		return skb->protocol;
	else if (skb->protocol == htons(ETH_P_8021Q))
		return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
	else
		return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Jesse Gross2755.10%125.00%


Stephen Hemminger2040.82%125.00%


Dave Jones12.04%125.00%


Jiri Pirko12.04%125.00%


Total49100.00%4100.00%




#define IS_VLAN_IP(skb) \
	(vlan_proto(skb) == htons(ETH_P_IP) && \
         brnf_filter_vlan_tagged)


#define IS_VLAN_IPV6(skb) \
	(vlan_proto(skb) == htons(ETH_P_IPV6) && \
         brnf_filter_vlan_tagged)


#define IS_VLAN_ARP(skb) \
	(vlan_proto(skb) == htons(ETH_P_ARP) && \
         brnf_filter_vlan_tagged)




static inline __be16 pppoe_proto(const struct sk_buff *skb)
{
	return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN +
			    sizeof(struct pppoe_hdr)));
}


Contributors
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Michael Milner36100.00%1100.00%


Total36100.00%1100.00%




#define IS_PPPOE_IP(skb) \
	(skb->protocol == htons(ETH_P_PPP_SES) && \
         pppoe_proto(skb) == htons(PPP_IP) && \
         brnf_filter_pppoe_tagged)


#define IS_PPPOE_IPV6(skb) \
	(skb->protocol == htons(ETH_P_PPP_SES) && \
         pppoe_proto(skb) == htons(PPP_IPV6) && \
         brnf_filter_pppoe_tagged)

/* largest possible L2 header, see br_nf_dev_queue_xmit() */

#define NF_BRIDGE_MAX_MAC_HEADER_LENGTH (PPPOE_SES_HLEN + ETH_HLEN)


struct brnf_frag_data {
	
char mac[NF_BRIDGE_MAX_MAC_HEADER_LENGTH];
	
u8 encap_size;
	
u8 size;
	
u16 vlan_tci;
	
__be16 vlan_proto;
};

static DEFINE_PER_CPU(struct brnf_frag_data, brnf_frag_data_storage);




static void nf_bridge_info_free(struct sk_buff *skb)
{
	if (skb->nf_bridge) {
		nf_bridge_put(skb->nf_bridge);
		skb->nf_bridge = NULL;
	}
}


Contributors
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Florian Westphal32100.00%1100.00%


Total32100.00%1100.00%






static inline struct net_device *bridge_parent(const struct net_device *dev)
{
	struct net_bridge_port *port;

	port = br_port_get_rcu(dev);
	return port ? port->br->dev : NULL;
}


Contributors
PersonTokensPropCommitsCommitProp
Stephen Hemminger3489.47%266.67%


Jiri Pirko410.53%133.33%


Total38100.00%3100.00%






static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb)
{
	struct nf_bridge_info *nf_bridge = skb->nf_bridge;

	if (atomic_read(&nf_bridge->use) > 1) {
		struct nf_bridge_info *tmp = nf_bridge_alloc(skb);

		if (tmp) {
			memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info));
			atomic_set(&tmp->use, 1);
		}
		nf_bridge_put(nf_bridge);
		nf_bridge = tmp;
	}
	return nf_bridge;
}


Contributors
PersonTokensPropCommitsCommitProp
Patrick McHardy8798.86%150.00%


Changli Gao11.14%150.00%


Total88100.00%2100.00%






unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
{
	switch (skb->protocol) {
	case __cpu_to_be16(ETH_P_8021Q):
		return VLAN_HLEN;
	case __cpu_to_be16(ETH_P_PPP_SES):
		return PPPOE_SES_HLEN;
	default:
		return 0;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Florian Westphal42100.00%1100.00%


Total42100.00%1100.00%






static inline void nf_bridge_pull_encap_header(struct sk_buff *skb)
{
	unsigned int len = nf_bridge_encap_header_len(skb);

	skb_pull(skb, len);
	skb->network_header += len;
}


Contributors
PersonTokensPropCommitsCommitProp
Patrick McHardy2985.29%133.33%


Stephen Hemminger38.82%133.33%


Michael Milner25.88%133.33%


Total34100.00%3100.00%






static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb)
{
	unsigned int len = nf_bridge_encap_header_len(skb);

	skb_pull_rcsum(skb, len);
	skb->network_header += len;
}


Contributors
PersonTokensPropCommitsCommitProp
Patrick McHardy3088.24%150.00%


Michael Milner411.76%150.00%


Total34100.00%2100.00%



/* When handing a packet over to the IP layer
 * check whether we have a skb that is in the
 * expected format
 */




static int br_validate_ipv4(struct net *net, struct sk_buff *skb)
{
	const struct iphdr *iph;
	u32 len;

	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
		goto inhdr_error;

	iph = ip_hdr(skb);

	/* Basic sanity checks */
	if (iph->ihl < 5 || iph->version != 4)
		goto inhdr_error;

	if (!pskb_may_pull(skb, iph->ihl*4))
		goto inhdr_error;

	iph = ip_hdr(skb);
	if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
		goto inhdr_error;

	len = ntohs(iph->tot_len);
	if (skb->len < len) {
		__IP_INC_STATS(net, IPSTATS_MIB_INTRUNCATEDPKTS);
		goto drop;
	} else if (len < (iph->ihl*4))
		goto inhdr_error;

	if (pskb_trim_rcsum(skb, len)) {
		__IP_INC_STATS(net, IPSTATS_MIB_INDISCARDS);
		goto drop;
	}

	memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
	/* We should really parse IP options here but until
         * somebody who actually uses IP options complains to
         * us we'll just silently ignore the options because
         * we're lazy!
         */
	return 0;

inhdr_error:
	__IP_INC_STATS(net, IPSTATS_MIB_INHDRERRORS);
drop:
	return -1;
}


Contributors
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Bandan Das18184.98%112.50%


Sarveshwar Bandi177.98%112.50%


Eric W. Biedermann83.76%112.50%


Eric Dumazet41.88%225.00%


Bernhard Thaler10.47%112.50%


Herbert Xu10.47%112.50%


Stephen Hemminger10.47%112.50%


Total213100.00%8100.00%






void nf_bridge_update_protocol(struct sk_buff *skb)
{
	switch (skb->nf_bridge->orig_proto) {
	case BRNF_PROTO_8021Q:
		skb->protocol = htons(ETH_P_8021Q);
		break;
	case BRNF_PROTO_PPPOE:
		skb->protocol = htons(ETH_P_PPP_SES);
		break;
	case BRNF_PROTO_UNCHANGED:
		break;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso2142.00%120.00%


Florian Westphal2142.00%360.00%


Bernhard Thaler816.00%120.00%


Total50100.00%5100.00%



/* Obtain the correct destination MAC address, while preserving the original
 * source MAC address. If we already know this address, we just copy it. If we
 * don't, we use the neighbour framework to find out. In both cases, we make
 * sure that br_handle_frame_finish() is called afterwards.
 */



int br_nf_pre_routing_finish_bridge(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	struct neighbour *neigh;
	struct dst_entry *dst;

	skb->dev = bridge_parent(skb->dev);
	if (!skb->dev)
		goto free_skb;
	dst = skb_dst(skb);
	neigh = dst_neigh_lookup_skb(dst, skb);
	if (neigh) {
		struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
		int ret;

		if (neigh->hh.hh_len) {
			neigh_hh_bridge(&neigh->hh, skb);
			skb->dev = nf_bridge->physindev;
			ret = br_handle_frame_finish(net, sk, skb);
		} else {
			/* the neighbour function below overwrites the complete
                         * MAC header, so we save the Ethernet source address and
                         * protocol number.
                         */
			skb_copy_from_linear_data_offset(skb,
							 -(ETH_HLEN-ETH_ALEN),
							 nf_bridge->neigh_header,
							 ETH_HLEN-ETH_ALEN);
			/* tell br_dev_xmit to continue with forwarding */
			nf_bridge->bridged_dnat = 1;
			/* FIXME Need to refragment */
			ret = neigh->output(neigh, skb);
		}
		neigh_release(neigh);
		return ret;
	}
free_skb:
	kfree_skb(skb);
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Bernhard Thaler8947.85%350.00%


Pablo Neira Ayuso8746.77%116.67%


Eric W. Biedermann73.76%116.67%


Florian Westphal31.61%116.67%


Total186100.00%6100.00%





static inline bool

br_nf_ipv4_daddr_was_changed(const struct sk_buff *skb,
			     const struct nf_bridge_info *nf_bridge)
{
	return ip_hdr(skb)->daddr != nf_bridge->ipv4_daddr;
}


Contributors
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Pablo Neira Ayuso31100.00%1100.00%


Total31100.00%1100.00%



/* This requires some explaining. If DNAT has taken place,
 * we will need to fix up the destination Ethernet address.
 * This is also true when SNAT takes place (for the reply direction).
 *
 * There are two cases to consider:
 * 1. The packet was DNAT'ed to a device in the same bridge
 *    port group as it was received on. We can still bridge
 *    the packet.
 * 2. The packet was DNAT'ed to a different device, either
 *    a non-bridged device or another bridge port group.
 *    The packet will need to be routed.
 *
 * The correct way of distinguishing between these two cases is to
 * call ip_route_input() and to look at skb->dst->dev, which is
 * changed to the destination device if ip_route_input() succeeds.
 *
 * Let's first consider the case that ip_route_input() succeeds:
 *
 * If the output device equals the logical bridge device the packet
 * came in on, we can consider this bridging. The corresponding MAC
 * address will be obtained in br_nf_pre_routing_finish_bridge.
 * Otherwise, the packet is considered to be routed and we just
 * change the destination MAC address so that the packet will
 * later be passed up to the IP stack to be routed. For a redirected
 * packet, ip_route_input() will give back the localhost as output device,
 * which differs from the bridge device.
 *
 * Let's now consider the case that ip_route_input() fails:
 *
 * This can be because the destination address is martian, in which case
 * the packet will be dropped.
 * If IP forwarding is disabled, ip_route_input() will fail, while
 * ip_route_output_key() can return success. The source
 * address for ip_route_output_key() is set to zero, so ip_route_output_key()
 * thinks we're handling a locally generated packet and won't care
 * if IP forwarding is enabled. If the output device equals the logical bridge
 * device, we proceed as if ip_route_input() succeeded. If it differs from the
 * logical bridge port or if ip_route_output_key() fails we drop the packet.
 */



static int br_nf_pre_routing_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	struct iphdr *iph = ip_hdr(skb);
	struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
	struct rtable *rt;
	int err;

	nf_bridge->frag_max_size = IPCB(skb)->frag_max_size;

	if (nf_bridge->pkt_otherhost) {
		skb->pkt_type = PACKET_OTHERHOST;
		nf_bridge->pkt_otherhost = false;
	}
	nf_bridge->in_prerouting = 0;
	if (br_nf_ipv4_daddr_was_changed(skb, nf_bridge)) {
		if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) {
			struct in_device *in_dev = __in_dev_get_rcu(dev);

			/* If err equals -EHOSTUNREACH the error is due to a
                         * martian destination or due to the fact that
                         * forwarding is disabled. For most martian packets,
                         * ip_route_output_key() will fail. It won't fail for 2 types of
                         * martian destinations: loopback destinations and destination
                         * 0.0.0.0. In both cases the packet will be dropped because the
                         * destination is the loopback device and not the bridge. */
			if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev))
				goto free_skb;

			rt = ip_route_output(net, iph->daddr, 0,
					     RT_TOS(iph->tos), 0);
			if (!IS_ERR(rt)) {
				/* - Bridged-and-DNAT'ed traffic doesn't
                                 *   require ip_forwarding. */
				if (rt->dst.dev == dev) {
					skb_dst_set(skb, &rt->dst);
					goto bridged_dnat;
				}
				ip_rt_put(rt);
			}
free_skb:
			kfree_skb(skb);
			return 0;
		} else {
			if (skb_dst(skb)->dev == dev) {
bridged_dnat:
				skb->dev = nf_bridge->physindev;
				nf_bridge_update_protocol(skb);
				nf_bridge_push_encap_header(skb);
				br_nf_hook_thresh(NF_BR_PRE_ROUTING,
						  net, sk, skb, skb->dev,
						  NULL,
						  br_nf_pre_routing_finish_bridge);
				return 0;
			}
			ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr);
			skb->pkt_type = PACKET_HOST;
		}
	} else {
		rt = bridge_parent_rtable(nf_bridge->physindev);
		if (!rt) {
			kfree_skb(skb);
			return 0;
		}
		skb_dst_set_noref(skb, &rt->dst);
	}

	skb->dev = nf_bridge->physindev;
	nf_bridge_update_protocol(skb);
	nf_bridge_push_encap_header(skb);
	br_nf_hook_thresh(NF_BR_PRE_ROUTING, net, sk, skb, skb->dev, NULL,
			  br_handle_frame_finish);
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Bart De Schuymer25866.15%618.75%


David S. Miller4010.26%39.38%


Simon Wunderlich225.64%13.12%


Eric Dumazet215.38%412.50%


Florian Westphal143.59%515.62%


Eric W. Biedermann102.56%39.38%


Herbert Xu92.31%13.12%


Arnaldo Carvalho de Melo61.54%26.25%


Michael Milner20.51%13.12%


Bernhard Thaler20.51%13.12%


Patrick McHardy20.51%13.12%


Joe Perches10.26%13.12%


Artur Molchanov10.26%13.12%


Pablo Neira Ayuso10.26%13.12%


Denis V. Lunev10.26%13.12%


Total390100.00%32100.00%






static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev)
{
	struct net_device *vlan, *br;

	br = bridge_parent(dev);
	if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb))
		return br;

	vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto,
				    skb_vlan_tag_get(skb) & VLAN_VID_MASK);

	return vlan ? vlan : br;
}


Contributors
PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso6790.54%120.00%


Patrick McHardy45.41%240.00%


Jiri Pirko22.70%120.00%


Ding Tianhong11.35%120.00%


Total74100.00%5100.00%



/* Some common code for IPv4/IPv6 */



struct net_device *setup_pre_routing(struct sk_buff *skb)
{
	struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);

	if (skb->pkt_type == PACKET_OTHERHOST) {
		skb->pkt_type = PACKET_HOST;
		nf_bridge->pkt_otherhost = true;
	}

	nf_bridge->in_prerouting = 1;
	nf_bridge->physindev = skb->dev;
	skb->dev = brnf_get_logical_dev(skb, skb->dev);

	if (skb->protocol == htons(ETH_P_8021Q))
		nf_bridge->orig_proto = BRNF_PROTO_8021Q;
	else if (skb->protocol == htons(ETH_P_PPP_SES))
		nf_bridge->orig_proto = BRNF_PROTO_PPPOE;

	/* Must drop socket now because of tproxy. */
	skb_orphan(skb);
	return skb->dev;
}


Contributors
PersonTokensPropCommitsCommitProp
Bart De Schuymer8572.65%222.22%


Florian Westphal2117.95%555.56%


Stephen Hemminger86.84%111.11%


Pablo Neira Ayuso32.56%111.11%


Total117100.00%9100.00%



/* Direct IPv6 traffic to br_nf_pre_routing_ipv6.
 * Replicate the checks that IPv4 does on packet reception.
 * Set skb->dev to the bridge device (i.e. parent of the
 * receiving device) to make netfilter happy, the REDIRECT
 * target in particular.  Save the original destination IP
 * address to be able to detect DNAT afterwards. */



static unsigned int br_nf_pre_routing(void *priv,
				      struct sk_buff *skb,
				      const struct nf_hook_state *state)
{
	struct nf_bridge_info *nf_bridge;
	struct net_bridge_port *p;
	struct net_bridge *br;
	__u32 len = nf_bridge_encap_header_len(skb);

	if (unlikely(!pskb_may_pull(skb, len)))
		return NF_DROP;

	p = br_port_get_rcu(state->in);
	if (p == NULL)
		return NF_DROP;
	br = p->br;

	if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) {
		if (!brnf_call_ip6tables && !br->nf_call_ip6tables)
			return NF_ACCEPT;

		nf_bridge_pull_encap_header_rcsum(skb);
		return br_nf_pre_routing_ipv6(priv, skb, state);
	}

	if (!brnf_call_iptables && !br->nf_call_iptables)
		return NF_ACCEPT;

	if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb))
		return NF_ACCEPT;

	nf_bridge_pull_encap_header_rcsum(skb);

	if (br_validate_ipv4(state->net, skb))
		return NF_DROP;

	nf_bridge_put(skb->nf_bridge);
	if (!nf_bridge_alloc(skb))
		return NF_DROP;
	if (!setup_pre_routing(skb))
		return NF_DROP;

	nf_bridge = nf_bridge_info_get(skb);
	nf_bridge->ipv4_daddr = ip_hdr(skb)->daddr;

	skb->protocol = htons(ETH_P_IP);

	NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, state->net, state->sk, skb,
		skb->dev, NULL,
		br_nf_pre_routing_finish);

	return NF_STOLEN;
}



Contributors
PersonTokensPropCommitsCommitProp
Bart De Schuymer10839.85%415.38%


Patrick McHardy4115.13%415.38%


Florian Westphal2810.33%27.69%


Evgeniy Polyakov217.75%13.85%


Michael Milner197.01%13.85%


Stephen Hemminger145.17%311.54%


Eric W. Biedermann114.06%311.54%


David S. Miller103.69%311.54%


Herbert Xu103.69%27.69%


David Kimdon72.58%13.85%


Jan Engelhardt10.37%13.85%


Bernhard Thaler10.37%13.85%


Total271100.00%26100.00%



/* PF_BRIDGE/FORWARD *************************************************/



static int br_nf_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
	struct net_device *in;

	if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) {

		if (skb->protocol == htons(ETH_P_IP))
			nf_bridge->frag_max_size = IPCB(skb)->frag_max_size;

		if (skb->protocol == htons(ETH_P_IPV6))
			nf_bridge->frag_max_size = IP6CB(skb)->frag_max_size;

		in = nf_bridge->physindev;
		if (nf_bridge->pkt_otherhost) {
			skb->pkt_type = PACKET_OTHERHOST;
			nf_bridge->pkt_otherhost = false;
		}
		nf_bridge_update_protocol(skb);
	} else {
		in = *((struct net_device **)(skb->cb));
	}
	nf_bridge_push_encap_header(skb);

	br_nf_hook_thresh(NF_BR_FORWARD, net, sk, skb, in, skb->dev,
			  br_forward_finish);
	return 0;
}



Contributors
PersonTokensPropCommitsCommitProp
Bart De Schuymer9755.75%423.53%


Florian Westphal3017.24%423.53%


Bernhard Thaler2413.79%211.76%


David S. Miller74.02%15.88%


Eric W. Biedermann74.02%211.76%


Michael Milner42.30%15.88%


Stephen Hemminger31.72%15.88%


Patrick McHardy10.57%15.88%


Pablo Neira Ayuso10.57%15.88%


Total174100.00%17100.00%



/* This is the 'purely bridged' case.  For IP, we pass the packet to
 * netfilter with indev and outdev set to the bridge device,
 * but we are still able to filter on the 'real' indev/outdev
 * because of the physdev module. For ARP, indev and outdev are the
 * bridge ports. */



static unsigned int br_nf_forward_ip(void *priv,
				     struct sk_buff *skb,
				     const struct nf_hook_state *state)
{
	struct nf_bridge_info *nf_bridge;
	struct net_device *parent;
	u_int8_t pf;

	if (!skb->nf_bridge)
		return NF_ACCEPT;

	/* Need exclusive nf_bridge_info since we might have multiple
         * different physoutdevs. */
	if (!nf_bridge_unshare(skb))
		return NF_DROP;

	nf_bridge = nf_bridge_info_get(skb);
	if (!nf_bridge)
		return NF_DROP;

	parent = bridge_parent(state->out);
	if (!parent)
		return NF_DROP;

	if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb))
		pf = NFPROTO_IPV4;
	else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb))
		pf = NFPROTO_IPV6;
	else
		return NF_ACCEPT;

	nf_bridge_pull_encap_header(skb);

	if (skb->pkt_type == PACKET_OTHERHOST) {
		skb->pkt_type = PACKET_HOST;
		nf_bridge->pkt_otherhost = true;
	}

	if (pf == NFPROTO_IPV4) {
		if (br_validate_ipv4(state->net, skb))
			return NF_DROP;
		IPCB(skb)->frag_max_size = nf_bridge->frag_max_size;
	}

	if (pf == NFPROTO_IPV6) {
		if (br_validate_ipv6(state->net, skb))
			return NF_DROP;
		IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size;
	}

	nf_bridge->physoutdev = skb->dev;
	if (pf == NFPROTO_IPV4)
		skb->protocol = htons(ETH_P_IP);
	else
		skb->protocol = htons(ETH_P_IPV6);

	NF_HOOK(pf, NF_INET_FORWARD, state->net, NULL, skb,
		brnf_get_logical_dev(skb, state->in),
		parent,	br_nf_forward_finish);

	return NF_STOLEN;
}


Contributors
PersonTokensPropCommitsCommitProp
Bart De Schuymer11639.59%721.21%


Florian Westphal3511.95%412.12%


Bernhard Thaler3311.26%39.09%


Herbert Xu3110.58%39.09%


Stephen Hemminger258.53%39.09%


Patrick McHardy155.12%412.12%


Eric W. Biedermann144.78%39.09%


Michael Milner82.73%13.03%


David S. Miller82.73%26.06%


Alban Crequy41.37%13.03%


Pablo Neira Ayuso31.02%13.03%


Jan Engelhardt10.34%13.03%


Total293100.00%33100.00%






static unsigned int br_nf_forward_arp(void *priv,
				      struct sk_buff *skb,
				      const struct nf_hook_state *state)
{
	struct net_bridge_port *p;
	struct net_bridge *br;
	struct net_device **d = (struct net_device **)(skb->cb);

	p = br_port_get_rcu(state->out);
	if (p == NULL)
		return NF_ACCEPT;
	br = p->br;

	if (!brnf_call_arptables && !br->nf_call_arptables)
		return NF_ACCEPT;

	if (!IS_ARP(skb)) {
		if (!IS_VLAN_ARP(skb))
			return NF_ACCEPT;
		nf_bridge_pull_encap_header(skb);
	}

	if (arp_hdr(skb)->ar_pln != 4) {
		if (IS_VLAN_ARP(skb))
			nf_bridge_push_encap_header(skb);
		return NF_ACCEPT;
	}
	*d = state->in;
	NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, state->net, state->sk, skb,
		state->in, state->out, br_nf_forward_finish);

	return NF_STOLEN;
}


Contributors
PersonTokensPropCommitsCommitProp
Bart De Schuymer10257.30%423.53%


Patrick McHardy3921.91%317.65%


David S. Miller158.43%317.65%


Eric W. Biedermann63.37%211.76%


Stephen Hemminger63.37%15.88%


Arnaldo Carvalho de Melo31.69%15.88%


Florian Westphal31.69%15.88%


Herbert Xu31.69%15.88%


Jan Engelhardt10.56%15.88%


Total178100.00%17100.00%






static int br_nf_push_frag_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	struct brnf_frag_data *data;
	int err;

	data = this_cpu_ptr(&brnf_frag_data_storage);
	err = skb_cow_head(skb, data->size);

	if (err) {
		kfree_skb(skb);
		return 0;
	}

	if (data->vlan_tci) {
		skb->vlan_tci = data->vlan_tci;
		skb->vlan_proto = data->vlan_proto;
	}

	skb_copy_to_linear_data_offset(skb, -data->size, data->mac, data->size);
	__skb_push(skb, data->encap_size);

	nf_bridge_info_free(skb);
	return br_dev_queue_push_xmit(net, sk, skb);
}


Contributors
PersonTokensPropCommitsCommitProp
Florian Westphal11489.06%450.00%


Eric W. Biedermann75.47%225.00%


Pablo Neira Ayuso53.91%112.50%


David S. Miller21.56%112.50%


Total128100.00%8100.00%





static int

br_nf_ip_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
		  int (*output)(struct