cregit-Linux how code gets into the kernel

Release 4.8 net/bridge/br_netfilter_hooks.c

Directory: net/bridge
 *      Handle firewalling
 *      Linux ethernet bridge
 *      Authors:
 *      Lennert Buytenhek               <>
 *      Bart De Schuymer                <>
 *      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/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 <asm/uaccess.h>
#include "br_private.h"
#include <linux/sysctl.h>

static int brnf_net_id __read_mostly;

struct brnf_net {
bool enabled;


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;

#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

#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; }


jesse grossjesse gross2755.10%125.00%
stephen hemmingerstephen hemminger2040.82%125.00%
jiri pirkojiri pirko12.04%125.00%
dave jonesdave jones12.04%125.00%

#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))); }


michael milnermichael milner36100.00%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; } }


florian westphalflorian westphal32100.00%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; }


stephen hemmingerstephen hemminger3489.47%266.67%
jiri pirkojiri pirko410.53%133.33%

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; }


patrick mchardypatrick mchardy8798.86%150.00%
changli gaochangli gao11.14%150.00%

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; } }


florian westphalflorian westphal42100.00%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; }


patrick mchardypatrick mchardy2985.29%133.33%
stephen hemmingerstephen hemminger38.82%133.33%
michael milnermichael milner25.88%133.33%

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; }


patrick mchardypatrick mchardy3088.24%150.00%
michael milnermichael milner411.76%150.00%

/* 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; }


bandan dasbandan das18184.98%112.50%
sarveshwar bandisarveshwar bandi177.98%112.50%
eric w. biedermaneric w. biederman83.76%112.50%
eric dumazeteric dumazet41.88%225.00%
bernhard thalerbernhard thaler10.47%112.50%
herbert xuherbert xu10.47%112.50%
stephen hemmingerstephen hemminger10.47%112.50%

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; } }


florian westphalflorian westphal2142.00%360.00%
pablo neira ayusopablo neira ayuso2142.00%120.00%
bernhard thalerbernhard thaler816.00%120.00%

/* 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; }


bernhard thalerbernhard thaler8947.85%350.00%
pablo neira ayusopablo neira ayuso8746.77%116.67%
eric w. biedermaneric w. biederman73.76%116.67%
florian westphalflorian westphal31.61%116.67%

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; }


pablo neira ayusopablo neira ayuso31100.00%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 * 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-> == 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); NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, net, sk, skb, skb->dev, NULL, br_nf_pre_routing_finish_bridge, 1); 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); NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, net, sk, skb, skb->dev, NULL, br_handle_frame_finish, 1); return 0; }


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david s. millerdavid s. miller4010.05%39.68%
simon wunderlichsimon wunderlich225.53%13.23%
eric dumazeteric dumazet215.28%412.90%
florian westphalflorian westphal123.02%412.90%
eric w. biedermaneric w. biederman102.51%39.68%
herbert xuherbert xu92.26%13.23%
arnaldo carvalho de meloarnaldo carvalho de melo61.51%26.45%
michael milnermichael milner20.50%13.23%
patrick mchardypatrick mchardy20.50%13.23%
bernhard thalerbernhard thaler20.50%13.23%
jan engelhardtjan engelhardt20.50%13.23%
joe perchesjoe perches10.25%13.23%
pablo neira ayusopablo neira ayuso10.25%13.23%
denis v. lunevdenis v. lunev10.25%13.23%

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; }


pablo neira ayusopablo neira ayuso6790.54%120.00%
patrick mchardypatrick mchardy45.41%240.00%
jiri pirkojiri pirko22.70%120.00%
ding tianhongding tianhong11.35%120.00%

/* 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; }


bart de schuymerbart de schuymer8572.65%222.22%
florian westphalflorian westphal2117.95%555.56%
stephen hemmingerstephen hemminger86.84%111.11%
pablo neira ayusopablo neira ayuso32.56%111.11%

/* 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; }


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patrick mchardypatrick mchardy4115.13%415.38%
florian westphalflorian westphal2810.33%27.69%
evgeniy polyakovevgeniy polyakov217.75%13.85%
michael milnermichael milner197.01%13.85%
stephen hemmingerstephen hemminger145.17%311.54%
eric w. biedermaneric w. biederman114.06%311.54%
david s. millerdavid s. miller103.69%311.54%
herbert xuherbert xu103.69%27.69%
david kimdondavid kimdon72.58%13.85%
bernhard thalerbernhard thaler10.37%13.85%
jan engelhardtjan engelhardt10.37%13.85%

/* PF_BRIDGE/LOCAL_IN ************************************************/ /* The packet is locally destined, which requires a real * dst_entry, so detach the fake one. On the way up, the * packet would pass through PRE_ROUTING again (which already * took place when the packet entered the bridge), but we * register an IPv4 PRE_ROUTING 'sabotage' hook that will * prevent this from happening. */
static unsigned int br_nf_local_in(void *priv, struct sk_buff *skb, const struct nf_hook_state *state) { br_drop_fake_rtable(skb); return NF_ACCEPT; }


bart de schuymerbart de schuymer2273.33%114.29%
eric w. biedermaneric w. biederman26.67%114.29%
david s. millerdavid s. miller26.67%114.29%
herbert xuherbert xu13.33%114.29%
peter huangpeter huang13.33%114.29%
patrick mchardypatrick mchardy13.33%114.29%
eric dumazeteric dumazet13.33%114.29%

/* 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); NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, net, sk, skb, in, skb->dev, br_forward_finish, 1); return 0; }


bart de schuymerbart de schuymer10156.74%423.53%
florian westphalflorian westphal3016.85%423.53%
bernhard thalerbernhard thaler2413.48%211.76%
eric w. biedermaneric w. biederman73.93%211.76%
david s. millerdavid s. miller73.93%15.88%
michael milnermichael milner42.25%15.88%
stephen hemmingerstephen hemminger31.69%15.88%
jan engelhardtjan engelhardt10.56%15.88%
patrick mchardypatrick mchardy10.56%15.88%

/* 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; }


bart de schuymerbart de schuymer11639.59%721.21%
florian westphalflorian westphal3511.95%412.12%
bernhard thalerbernhard thaler3311.26%39.09%
herbert xuherbert xu3110.58%39.09%
stephen hemmingerstephen hemminger258.53%39.09%
patrick mchardypatrick mchardy155.12%412.12%
eric w. biedermaneric w. biederman144.78%39.09%
michael milnermichael milner82.73%13.03%
david s. millerdavid s. miller82.73%26.06%
alban crequyalban crequy41.37%13.03%
pablo neira ayusopablo neira ayuso31.02%13.03%
jan engelhardtjan engelhardt10.34%13.03%

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; }


bart de schuymerbart de schuymer10257.30%423.53%
patrick mchardypatrick mchardy3921.91%317.65%
david s. millerdavid s. miller158.43%317.65%
stephen hemmingerstephen hemminger63.37%15.88%
eric w. biedermaneric w. biederman63.37%211.76%
florian westphalflorian westphal31.69%15.88%
herbert xuherbert xu31.69%15.88%
arnaldo carvalho de meloarnaldo carvalho de melo31.69%15.88%
jan engelhardtjan engelhardt10.56%15.88%

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,