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

PersonTokensPropCommitsCommitProp
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

PersonTokensPropCommitsCommitProp
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

PersonTokensPropCommitsCommitProp
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

PersonTokensPropCommitsCommitProp
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 net *, struct sock *, struct sk_buff *)) { unsigned int mtu = ip_skb_dst_mtu(sk, skb); struct iphdr *iph = ip_hdr(skb); if (unlikely(((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) || (IPCB(skb)->frag_max_size && IPCB(skb)->frag_max_size > mtu))) { IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS); kfree_skb(skb); return -EMSGSIZE; } return ip_do_fragment(net, sk, skb, output); }

Contributors

PersonTokensPropCommitsCommitProp
Andy Zhou11889.39%125.00%
Eric W. Biedermann129.09%250.00%
Shmulik Ladkani21.52%125.00%
Total132100.00%4100.00%


static unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb) { if (skb->nf_bridge->orig_proto == BRNF_PROTO_PPPOE) return PPPOE_SES_HLEN; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Florian Westphal29100.00%1100.00%
Total29100.00%1100.00%


static int br_nf_dev_queue_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) { struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); unsigned int mtu, mtu_reserved; mtu_reserved = nf_bridge_mtu_reduction(skb); mtu = skb->dev->mtu; if (nf_bridge->frag_max_size && nf_bridge->frag_max_size < mtu) mtu = nf_bridge->frag_max_size; if (skb_is_gso(skb) || skb->len + mtu_reserved <= mtu) { nf_bridge_info_free(skb); return br_dev_queue_push_xmit(net, sk, skb); } /* This is wrong! We should preserve the original fragment * boundaries by preserving frag_list rather than refragmenting. */ if (IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) && skb->protocol == htons(ETH_P_IP)) { struct brnf_frag_data *data; if (br_validate_ipv4(net, skb)) goto drop; IPCB(skb)->frag_max_size = nf_bridge->frag_max_size; nf_bridge_update_protocol(skb); data = this_cpu_ptr(&brnf_frag_data_storage); data->vlan_tci = skb->vlan_tci; data->vlan_proto = skb->vlan_proto; data->encap_size = nf_bridge_encap_header_len(skb); data->size = ETH_HLEN + data->encap_size; skb_copy_from_linear_data_offset(skb, -data->size, data->mac, data->size); return br_nf_ip_fragment(net, sk, skb, br_nf_push_frag_xmit); } if (IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) && skb->protocol == htons(ETH_P_IPV6)) { const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); struct brnf_frag_data *data; if (br_validate_ipv6(net, skb)) goto drop; IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size; nf_bridge_update_protocol(skb); data = this_cpu_ptr(&brnf_frag_data_storage); data->encap_size = nf_bridge_encap_header_len(skb); data->size = ETH_HLEN + data->encap_size; skb_copy_from_linear_data_offset(skb, -data->size, data->mac, data->size); if (v6ops) return v6ops->fragment(net, sk, skb, br_nf_push_frag_xmit); kfree_skb(skb); return -EMSGSIZE; } nf_bridge_info_free(skb); return br_dev_queue_push_xmit(net, sk, skb); drop: kfree_skb(skb); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Florian Westphal15941.41%624.00%
Bernhard Thaler13334.64%312.00%
Patrick McHardy194.95%28.00%
Eric W. Biedermann194.95%520.00%
David S. Miller184.69%28.00%
Herbert Xu102.60%14.00%
hummerbliss@gmail.com71.82%14.00%
Arnd Bergmann71.82%14.00%
Bart De Schuymer61.56%28.00%
Bandan Das51.30%14.00%
Andy Zhou10.26%14.00%
Total384100.00%25100.00%

/* PF_BRIDGE/POST_ROUTING ********************************************/
static unsigned int br_nf_post_routing(void *priv, struct sk_buff *skb, const struct nf_hook_state *state) { struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); struct net_device *realoutdev = bridge_parent(skb->dev); u_int8_t pf; /* if nf_bridge is set, but ->physoutdev is NULL, this packet came in * on a bridge, but was delivered locally and is now being routed: * * POST_ROUTING was already invoked from the ip stack. */ if (!nf_bridge || !nf_bridge->physoutdev) return NF_ACCEPT; if (!realoutdev) 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; /* We assume any code from br_dev_queue_push_xmit onwards doesn't care * about the value of skb->pkt_type. */ if (skb->pkt_type == PACKET_OTHERHOST) { skb->pkt_type = PACKET_HOST; nf_bridge->pkt_otherhost = true; } nf_bridge_pull_encap_header(skb); if (pf == NFPROTO_IPV4) skb->protocol = htons(ETH_P_IP); else skb->protocol = htons(ETH_P_IPV6); NF_HOOK(pf, NF_INET_POST_ROUTING, state->net, state->sk, skb, NULL, realoutdev, br_nf_dev_queue_xmit); return NF_STOLEN; }

Contributors

PersonTokensPropCommitsCommitProp
Bart De Schuymer11257.44%623.08%
Herbert Xu2211.28%27.69%
Patrick McHardy136.67%519.23%
Florian Westphal126.15%415.38%
Stephen Hemminger115.64%27.69%
Michael Milner94.62%13.85%
David S. Miller63.08%27.69%
Eric W. Biedermann63.08%27.69%
Alban Crequy31.54%13.85%
Jan Engelhardt10.51%13.85%
Total195100.00%26100.00%

/* IP/SABOTAGE *****************************************************/ /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING * for the second time. */
static unsigned int ip_sabotage_in(void *priv, struct sk_buff *skb, const struct nf_hook_state *state) { if (skb->nf_bridge && !skb->nf_bridge->in_prerouting) { state->okfn(state->net, state->sk, skb); return NF_STOLEN; } return NF_ACCEPT; }

Contributors

PersonTokensPropCommitsCommitProp
Bart De Schuymer3153.45%333.33%
Pablo Neira Ayuso1831.03%111.11%
Herbert Xu35.17%111.11%
David S. Miller23.45%111.11%
Eric W. Biedermann23.45%111.11%
Florian Westphal11.72%111.11%
Patrick McHardy11.72%111.11%
Total58100.00%9100.00%

/* This is called when br_netfilter has called into iptables/netfilter, * and DNAT has taken place on a bridge-forwarded packet. * * neigh->output has created a new MAC header, with local br0 MAC * as saddr. * * This restores the original MAC saddr of the bridged packet * before invoking bridge forward logic to transmit the packet. */
static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb) { struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); skb_pull(skb, ETH_HLEN); nf_bridge->bridged_dnat = 0; BUILD_BUG_ON(sizeof(nf_bridge->neigh_header) != (ETH_HLEN - ETH_ALEN)); skb_copy_to_linear_data_offset(skb, -(ETH_HLEN - ETH_ALEN), nf_bridge->neigh_header, ETH_HLEN - ETH_ALEN); skb->dev = nf_bridge->physindev; nf_bridge->physoutdev = NULL; br_handle_frame_finish(dev_net(skb->dev), NULL, skb); }

Contributors

PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso6061.22%114.29%
Florian Westphal2929.59%457.14%
Eric W. Biedermann77.14%114.29%
David S. Miller22.04%114.29%
Total98100.00%7100.00%


static int br_nf_dev_xmit(struct sk_buff *skb) { if (skb->nf_bridge && skb->nf_bridge->bridged_dnat) { br_nf_pre_routing_finish_bridge_slow(skb); return 1; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso3597.22%266.67%
Florian Westphal12.78%133.33%
Total36100.00%3100.00%

static const struct nf_br_ops br_ops = { .br_dev_xmit_hook = br_nf_dev_xmit, };
void br_netfilter_enable(void) { }

Contributors

PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso6100.00%1100.00%
Total6100.00%1100.00%

EXPORT_SYMBOL_GPL(br_netfilter_enable); /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because * br_dev_queue_push_xmit is called afterwards */ static struct nf_hook_ops br_nf_ops[] __read_mostly = { { .hook = br_nf_pre_routing, .pf = NFPROTO_BRIDGE, .hooknum = NF_BR_PRE_ROUTING, .priority = NF_BR_PRI_BRNF, }, { .hook = br_nf_forward_ip, .pf = NFPROTO_BRIDGE, .hooknum = NF_BR_FORWARD, .priority = NF_BR_PRI_BRNF - 1, }, { .hook = br_nf_forward_arp, .pf = NFPROTO_BRIDGE, .hooknum = NF_BR_FORWARD, .priority = NF_BR_PRI_BRNF, }, { .hook = br_nf_post_routing, .pf = NFPROTO_BRIDGE, .hooknum = NF_BR_POST_ROUTING, .priority = NF_BR_PRI_LAST, }, { .hook = ip_sabotage_in, .pf = NFPROTO_IPV4, .hooknum = NF_INET_PRE_ROUTING, .priority = NF_IP_PRI_FIRST, }, { .hook = ip_sabotage_in, .pf = NFPROTO_IPV6, .hooknum = NF_INET_PRE_ROUTING, .priority = NF_IP6_PRI_FIRST, }, };
static int brnf_device_event(struct notifier_block *unused, unsigned long event, void *ptr) { struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct brnf_net *brnet; struct net *net; int ret; if (event != NETDEV_REGISTER || !(dev->priv_flags & IFF_EBRIDGE)) return NOTIFY_DONE; ASSERT_RTNL(); net = dev_net(dev); brnet = net_generic(net, brnf_net_id); if (brnet->enabled) return NOTIFY_OK; ret = nf_register_net_hooks(net, br_nf_ops, ARRAY_SIZE(br_nf_ops)); if (ret) return NOTIFY_BAD; brnet->enabled = true; return NOTIFY_OK; }

Contributors

PersonTokensPropCommitsCommitProp
Florian Westphal118100.00%1100.00%
Total118100.00%1100.00%


static void __net_exit brnf_exit_net(struct net *net) { struct brnf_net *brnet = net_generic(net, brnf_net_id); if (!brnet->enabled) return; nf_unregister_net_hooks(net, br_nf_ops, ARRAY_SIZE(br_nf_ops)); brnet->enabled = false; }

Contributors

PersonTokensPropCommitsCommitProp
Florian Westphal50100.00%1100.00%
Total50100.00%1100.00%

static struct pernet_operations brnf_net_ops __read_mostly = { .exit = brnf_exit_net, .id = &brnf_net_id, .size = sizeof(struct brnf_net), }; static struct notifier_block brnf_notifier __read_mostly = { .notifier_call = brnf_device_event, }; /* recursively invokes nf_hook_slow (again), skipping already-called * hooks (< NF_BR_PRI_BRNF). * * Called with rcu read lock held. */
int br_nf_hook_thresh(unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb, struct net_device *indev, struct net_device *outdev, int (*okfn)(struct net *, struct sock *, struct sk_buff *)) { struct nf_hook_entry *elem; struct nf_hook_state state; int ret; for (elem = rcu_dereference(net->nf.hooks[NFPROTO_BRIDGE][hook]); elem && nf_hook_entry_priority(elem) <= NF_BR_PRI_BRNF; elem = rcu_dereference(elem->next)) ; if (!elem) return okfn(net, sk, skb); /* We may already have this, but read-locks nest anyway */ rcu_read_lock(); nf_hook_state_init(&state, hook, NFPROTO_BRIDGE, indev, outdev, sk, net, okfn); ret = nf_hook_slow(skb, &state, elem); rcu_read_unlock(); if (ret == 1) ret = okfn(net, sk, skb); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Florian Westphal15084.75%120.00%
Aaron Conole2514.12%360.00%
Pablo Neira Ayuso21.13%120.00%
Total177100.00%5100.00%

#ifdef CONFIG_SYSCTL
static int brnf_sysctl_call_tables(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { int ret; ret = proc_dointvec(ctl, write, buffer, lenp, ppos); if (write && *(int *)(ctl->data)) *(int *)(ctl->data) = 1; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Bart De Schuymer6889.47%125.00%
Linus Torvalds67.89%125.00%
Joe Perches11.32%125.00%
Al Viro11.32%125.00%
Total76100.00%4100.00%

static struct ctl_table brnf_table[] = { { .procname = "bridge-nf-call-arptables", .data = &brnf_call_arptables, .maxlen = sizeof(int), .mode = 0644, .proc_handler = brnf_sysctl_call_tables, }, { .procname = "bridge-nf-call-iptables", .data = &brnf_call_iptables, .maxlen = sizeof(int), .mode = 0644, .proc_handler = brnf_sysctl_call_tables, }, { .procname = "bridge-nf-call-ip6tables", .data = &brnf_call_ip6tables, .maxlen = sizeof(int), .mode = 0644, .proc_handler = brnf_sysctl_call_tables, }, { .procname = "bridge-nf-filter-vlan-tagged", .data = &brnf_filter_vlan_tagged, .maxlen = sizeof(int), .mode = 0644, .proc_handler = brnf_sysctl_call_tables, }, { .procname = "bridge-nf-filter-pppoe-tagged", .data = &brnf_filter_pppoe_tagged, .maxlen = sizeof(int), .mode = 0644, .proc_handler = brnf_sysctl_call_tables, }, { .procname = "bridge-nf-pass-vlan-input-dev", .data = &brnf_pass_vlan_indev, .maxlen = sizeof(int), .mode = 0644, .proc_handler = brnf_sysctl_call_tables, }, { } }; #endif
static int __init br_netfilter_init(void) { int ret; ret = register_pernet_subsys(&brnf_net_ops); if (ret < 0) return ret; ret = register_netdevice_notifier(&brnf_notifier); if (ret < 0) { unregister_pernet_subsys(&brnf_net_ops); return ret; } #ifdef CONFIG_SYSCTL brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); if (brnf_sysctl_header == NULL) { printk(KERN_WARNING "br_netfilter: can't register to sysctl.\n"); unregister_netdevice_notifier(&brnf_notifier); unregister_pernet_subsys(&brnf_net_ops); return -ENOMEM; } #endif RCU_INIT_POINTER(nf_br_ops, &br_ops); printk(KERN_NOTICE "Bridge firewalling registered\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Bart De Schuymer5244.07%218.18%
Florian Westphal3529.66%19.09%
Pablo Neira Ayuso97.63%218.18%
Patrick McHardy86.78%19.09%
Geert Uytterhoeven65.08%19.09%
Eric W. Biedermann54.24%218.18%
Pavel Emelyanov21.69%19.09%
Andries E. Brouwer10.85%19.09%
Total118100.00%11100.00%


static void __exit br_netfilter_fini(void) { RCU_INIT_POINTER(nf_br_ops, NULL); unregister_netdevice_notifier(&brnf_notifier); unregister_pernet_subsys(&brnf_net_ops); #ifdef CONFIG_SYSCTL unregister_net_sysctl_table(brnf_sysctl_header); #endif }

Contributors

PersonTokensPropCommitsCommitProp
Bart De Schuymer1847.37%228.57%
Pablo Neira Ayuso1026.32%228.57%
Florian Westphal821.05%114.29%
Patrick McHardy12.63%114.29%
Eric W. Biedermann12.63%114.29%
Total38100.00%7100.00%

module_init(br_netfilter_init); module_exit(br_netfilter_fini); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Lennert Buytenhek <buytenh@gnu.org>"); MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); MODULE_DESCRIPTION("Linux ethernet netfilter firewall bridge");

Overall Contributors

PersonTokensPropCommitsCommitProp
Bart De Schuymer138029.40%139.03%
Florian Westphal105822.54%2416.67%
Pablo Neira Ayuso4469.50%106.94%
Patrick McHardy3056.50%128.33%
Bernhard Thaler2946.26%53.47%
Stephen Hemminger1894.03%74.86%
Bandan Das1873.98%10.69%
Michael Milner1453.09%10.69%
Eric W. Biedermann1232.62%128.33%
Andy Zhou1192.54%10.69%
David S. Miller1102.34%64.17%
Herbert Xu911.94%74.86%
Jesse Gross300.64%10.69%
Eric Dumazet280.60%74.86%
Aaron Conole250.53%32.08%
Simon Wunderlich220.47%10.69%
Evgeniy Polyakov210.45%10.69%
Sarveshwar Bandi170.36%10.69%
Arnaldo Carvalho de Melo150.32%42.78%
Alban Crequy130.28%10.69%
Jiri Pirko100.21%21.39%
Linus Torvalds70.15%21.39%
David Kimdon70.15%10.69%
hummerbliss@gmail.com70.15%10.69%
Arnd Bergmann70.15%10.69%
Geert Uytterhoeven60.13%10.69%
Cyrill V. Gorcunov60.13%10.69%
Jan Engelhardt40.09%32.08%
Brian Haley40.09%10.69%
Joe Perches30.06%21.39%
Tejun Heo30.06%10.69%
Shmulik Ladkani20.04%10.69%
Pavel Emelyanov20.04%10.69%
Alexey Dobriyan10.02%10.69%
Andries E. Brouwer10.02%10.69%
Denis V. Lunev10.02%10.69%
Al Viro10.02%10.69%
Changli Gao10.02%10.69%
Ding Tianhong10.02%10.69%
Artur Molchanov10.02%10.69%
Dave Jones10.02%10.69%
Total4694100.00%144100.00%
Directory: net/bridge
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