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netfilter: bridge: move br_netfilter out of the core

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Jesper reported that br_netfilter always registers the hooks since
this is part of the bridge core. This harms performance for people that
don't need this.

This patch modularizes br_netfilter so it can be rmmod'ed, thus,
the hooks can be unregistered. I think the bridge netfilter should have
been a separated module since the beginning, Patrick agreed on that.

Note that this is breaking compatibility for users that expect that
bridge netfilter is going to be available after explicitly 'modprobe
bridge' or via automatic load through brctl.

However, the damage can be easily undone by modprobing br_netfilter.
The bridge core also spots a message to provide a clue to people that
didn't notice that this has been deprecated.

On top of that, the plan is that nftables will not rely on this software
layer, but integrate the connection tracking into the bridge layer to
enable stateful filtering and NAT, which is was bridge netfilter users
seem to require.

This patch still keeps the fake_dst_ops in the bridge core, since this
is required by when the bridge port is initialized. So we can safely
modprobe/rmmod br_netfilter anytime.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Pablo Neira Ayuso 2014-09-18 11:29:03 +02:00
parent 7276ca3fa2
commit 34666d467c
16 changed files with 151 additions and 104 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/netfilter_bridge.h
View File

@ -15,7 +15,7 @@ enum nf_br_hook_priorities {
NF_BR_PRI_LAST = INT_MAX,
};
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
#define BRNF_PKT_TYPE 0x01
#define BRNF_BRIDGED_DNAT 0x02

12
include/linux/skbuff.h
View File

@ -156,7 +156,7 @@ struct nf_conntrack {
};
#endif
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
struct nf_bridge_info {
atomic_t use;
unsigned int mask;
@ -560,7 +560,7 @@ struct sk_buff {
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
struct nf_conntrack *nfct;
#endif
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
struct nf_bridge_info *nf_bridge;
#endif
@ -2977,7 +2977,7 @@ static inline void nf_conntrack_get(struct nf_conntrack *nfct)
atomic_inc(&nfct->use);
}
#endif
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
static inline void nf_bridge_put(struct nf_bridge_info *nf_bridge)
{
if (nf_bridge && atomic_dec_and_test(&nf_bridge->use))
@ -2995,7 +2995,7 @@ static inline void nf_reset(struct sk_buff *skb)
nf_conntrack_put(skb->nfct);
skb->nfct = NULL;
#endif
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
nf_bridge_put(skb->nf_bridge);
skb->nf_bridge = NULL;
#endif
@ -3016,7 +3016,7 @@ static inline void __nf_copy(struct sk_buff *dst, const struct sk_buff *src)
nf_conntrack_get(src->nfct);
dst->nfctinfo = src->nfctinfo;
#endif
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
dst->nf_bridge = src->nf_bridge;
nf_bridge_get(src->nf_bridge);
#endif
@ -3030,7 +3030,7 @@ static inline void nf_copy(struct sk_buff *dst, const struct sk_buff *src)
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
nf_conntrack_put(dst->nfct);
#endif
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
nf_bridge_put(dst->nf_bridge);
#endif
__nf_copy(dst, src);

2
include/net/neighbour.h
View File

@ -373,7 +373,7 @@ static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
return 0;
}
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb)
{
unsigned int seq, hh_alen;

2
include/net/netfilter/ipv4/nf_reject.h
View File

@ -98,7 +98,7 @@ static void nf_send_reset(struct sk_buff *oldskb, int hook)
nf_ct_attach(nskb, oldskb);
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
/* If we use ip_local_out for bridged traffic, the MAC source on
* the RST will be ours, instead of the destination's. This confuses
* some routers/firewalls, and they drop the packet. So we need to

2
include/net/netfilter/ipv6/nf_reject.h
View File

@ -147,7 +147,7 @@ static void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
nf_ct_attach(nskb, oldskb);
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
/* If we use ip6_local_out for bridged traffic, the MAC source on
* the RST will be ours, instead of the destination's. This confuses
* some routers/firewalls, and they drop the packet. So we need to

7
net/Kconfig
View File

@ -176,10 +176,11 @@ config NETFILTER_ADVANCED
If unsure, say Y.
config BRIDGE_NETFILTER
bool "Bridged IP/ARP packets filtering"
depends on BRIDGE && NETFILTER && INET
tristate "Bridged IP/ARP packets filtering"
depends on (BRIDGE || BRIDGE=n)
depends on NETFILTER && INET
depends on NETFILTER_ADVANCED
default y
default m
---help---
Enabling this option will let arptables resp. iptables see bridged
ARP resp. IP traffic. If you want a bridging firewall, you probably

5
net/bridge/Makefile
View File

@ -6,11 +6,12 @@ obj-$(CONFIG_BRIDGE) += bridge.o
bridge-y := br.o br_device.o br_fdb.o br_forward.o br_if.o br_input.o \
br_ioctl.o br_stp.o br_stp_bpdu.o \
br_stp_if.o br_stp_timer.o br_netlink.o
br_stp_if.o br_stp_timer.o br_netlink.o \
br_nf_core.o
bridge-$(CONFIG_SYSFS) += br_sysfs_if.o br_sysfs_br.o
bridge-$(CONFIG_BRIDGE_NETFILTER) += br_netfilter.o
obj-$(CONFIG_BRIDGE_NETFILTER) += br_netfilter.o
bridge-$(CONFIG_BRIDGE_IGMP_SNOOPING) += br_multicast.o br_mdb.o

14
net/bridge/br.c
View File

@ -161,7 +161,7 @@ static int __init br_init(void)
if (err)
goto err_out1;
err = br_netfilter_init();
err = br_nf_core_init();
if (err)
goto err_out2;
@ -179,11 +179,16 @@ static int __init br_init(void)
br_fdb_test_addr_hook = br_fdb_test_addr;
#endif
pr_info("bridge: automatic filtering via arp/ip/ip6tables has been "
"deprecated. Update your scripts to load br_netfilter if you "
"need this.\n");
return 0;
err_out4:
unregister_netdevice_notifier(&br_device_notifier);
err_out3:
br_netfilter_fini();
br_nf_core_fini();
err_out2:
unregister_pernet_subsys(&br_net_ops);
err_out1:
@ -196,20 +201,17 @@ static int __init br_init(void)
static void __exit br_deinit(void)
{
stp_proto_unregister(&br_stp_proto);
br_netlink_fini();
unregister_netdevice_notifier(&br_device_notifier);
brioctl_set(NULL);
unregister_pernet_subsys(&br_net_ops);
rcu_barrier(); /* Wait for completion of call_rcu()'s */
br_netfilter_fini();
br_nf_core_fini();
#if IS_ENABLED(CONFIG_ATM_LANE)
br_fdb_test_addr_hook = NULL;
#endif
br_fdb_fini();
}

4
net/bridge/br_device.c
View File

@ -36,7 +36,7 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
u16 vid = 0;
rcu_read_lock();
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
br_nf_pre_routing_finish_bridge_slow(skb);
rcu_read_unlock();
@ -167,7 +167,7 @@ static int br_change_mtu(struct net_device *dev, int new_mtu)
dev->mtu = new_mtu;
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
/* remember the MTU in the rtable for PMTU */
dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
#endif

2
net/bridge/br_forward.c
View File

@ -49,6 +49,7 @@ int br_dev_queue_push_xmit(struct sk_buff *skb)
return 0;
}
EXPORT_SYMBOL_GPL(br_dev_queue_push_xmit);
int br_forward_finish(struct sk_buff *skb)
{
@ -56,6 +57,7 @@ int br_forward_finish(struct sk_buff *skb)
br_dev_queue_push_xmit);
}
EXPORT_SYMBOL_GPL(br_forward_finish);
static void __br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
{

1
net/bridge/br_input.c
View File

@ -140,6 +140,7 @@ int br_handle_frame_finish(struct sk_buff *skb)
kfree_skb(skb);
goto out;
}
EXPORT_SYMBOL_GPL(br_handle_frame_finish);
/* note: already called with rcu_read_lock */
static int br_handle_local_finish(struct sk_buff *skb)

88
net/bridge/br_netfilter.c
View File

@ -111,66 +111,6 @@ static inline __be16 pppoe_proto(const struct sk_buff *skb)
pppoe_proto(skb) == htons(PPP_IPV6) && \
brnf_filter_pppoe_tagged)
static void fake_update_pmtu(struct dst_entry *dst, struct sock *sk,
struct sk_buff *skb, u32 mtu)
{
}
static void fake_redirect(struct dst_entry *dst, struct sock *sk,
struct sk_buff *skb)
{
}
static u32 *fake_cow_metrics(struct dst_entry *dst, unsigned long old)
{
return NULL;
}
static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr)
{
return NULL;
}
static unsigned int fake_mtu(const struct dst_entry *dst)
{
return dst->dev->mtu;
}
static struct dst_ops fake_dst_ops = {
.family = AF_INET,
.protocol = cpu_to_be16(ETH_P_IP),
.update_pmtu = fake_update_pmtu,
.redirect = fake_redirect,
.cow_metrics = fake_cow_metrics,
.neigh_lookup = fake_neigh_lookup,
.mtu = fake_mtu,
};
/*
* Initialize bogus route table used to keep netfilter happy.
* Currently, we fill in the PMTU entry because netfilter
* refragmentation needs it, and the rt_flags entry because
* ipt_REJECT needs it. Future netfilter modules might
* require us to fill additional fields.
*/
static const u32 br_dst_default_metrics[RTAX_MAX] = {
[RTAX_MTU - 1] = 1500,
};
void br_netfilter_rtable_init(struct net_bridge *br)
{
struct rtable *rt = &br->fake_rtable;
atomic_set(&rt->dst.__refcnt, 1);
rt->dst.dev = br->dev;
rt->dst.path = &rt->dst;
dst_init_metrics(&rt->dst, br_dst_default_metrics, true);
rt->dst.flags = DST_NOXFRM | DST_FAKE_RTABLE;
rt->dst.ops = &fake_dst_ops;
}
static inline struct rtable *bridge_parent_rtable(const struct net_device *dev)
{
struct net_bridge_port *port;
@ -1031,38 +971,42 @@ static struct ctl_table brnf_table[] = {
};
#endif
int __init br_netfilter_init(void)
static int __init br_netfilter_init(void)
{
int ret;
ret = dst_entries_init(&fake_dst_ops);
ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops));
if (ret < 0)
return ret;
ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops));
if (ret < 0) {
dst_entries_destroy(&fake_dst_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");
nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops));
dst_entries_destroy(&fake_dst_ops);
return -ENOMEM;
ret = -ENOMEM;
goto err1;
}
#endif
printk(KERN_NOTICE "Bridge firewalling registered\n");
return 0;
err1:
nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops));
return ret;
}
void br_netfilter_fini(void)
static void __exit br_netfilter_fini(void)
{
nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops));
#ifdef CONFIG_SYSCTL
unregister_net_sysctl_table(brnf_sysctl_header);
#endif
dst_entries_destroy(&fake_dst_ops);
}
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");

2
net/bridge/br_netlink.c
View File

@ -602,7 +602,7 @@ int __init br_netlink_init(void)
return err;
}
void __exit br_netlink_fini(void)
void br_netlink_fini(void)
{
br_mdb_uninit();
rtnl_af_unregister(&br_af_ops);

96
net/bridge/br_nf_core.c Normal file
View File

@ -0,0 +1,96 @@
/*
* Handle firewalling core
* 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/in_route.h>
#include <linux/inetdevice.h>
#include <net/route.h>
#include "br_private.h"
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
static void fake_update_pmtu(struct dst_entry *dst, struct sock *sk,
struct sk_buff *skb, u32 mtu)
{
}
static void fake_redirect(struct dst_entry *dst, struct sock *sk,
struct sk_buff *skb)
{
}
static u32 *fake_cow_metrics(struct dst_entry *dst, unsigned long old)
{
return NULL;
}
static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr)
{
return NULL;
}
static unsigned int fake_mtu(const struct dst_entry *dst)
{
return dst->dev->mtu;
}
static struct dst_ops fake_dst_ops = {
.family = AF_INET,
.protocol = cpu_to_be16(ETH_P_IP),
.update_pmtu = fake_update_pmtu,
.redirect = fake_redirect,
.cow_metrics = fake_cow_metrics,
.neigh_lookup = fake_neigh_lookup,
.mtu = fake_mtu,
};
/*
* Initialize bogus route table used to keep netfilter happy.
* Currently, we fill in the PMTU entry because netfilter
* refragmentation needs it, and the rt_flags entry because
* ipt_REJECT needs it. Future netfilter modules might
* require us to fill additional fields.
*/
static const u32 br_dst_default_metrics[RTAX_MAX] = {
[RTAX_MTU - 1] = 1500,
};
void br_netfilter_rtable_init(struct net_bridge *br)
{
struct rtable *rt = &br->fake_rtable;
atomic_set(&rt->dst.__refcnt, 1);
rt->dst.dev = br->dev;
rt->dst.path = &rt->dst;
dst_init_metrics(&rt->dst, br_dst_default_metrics, true);
rt->dst.flags = DST_NOXFRM | DST_FAKE_RTABLE;
rt->dst.ops = &fake_dst_ops;
}
int __init br_nf_core_init(void)
{
return dst_entries_init(&fake_dst_ops);
}
void br_nf_core_fini(void)
{
dst_entries_destroy(&fake_dst_ops);
}

12
net/bridge/br_private.h
View File

@ -221,7 +221,7 @@ struct net_bridge
struct pcpu_sw_netstats __percpu *stats;
spinlock_t hash_lock;
struct hlist_head hash[BR_HASH_SIZE];
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
struct rtable fake_rtable;
bool nf_call_iptables;
bool nf_call_ip6tables;
@ -751,13 +751,13 @@ static inline int br_vlan_enabled(struct net_bridge *br)
#endif
/* br_netfilter.c */
#ifdef CONFIG_BRIDGE_NETFILTER
int br_netfilter_init(void);
void br_netfilter_fini(void);
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
int br_nf_core_init(void);
void br_nf_core_fini(void);
void br_netfilter_rtable_init(struct net_bridge *);
#else
#define br_netfilter_init() (0)
#define br_netfilter_fini() do { } while (0)
static inline int br_nf_core_init(void) { return 0; }
static inline void br_nf_core_fini(void) {}
#define br_netfilter_rtable_init(x)
#endif

4
net/bridge/br_sysfs_br.c
View File

@ -629,7 +629,7 @@ static ssize_t multicast_startup_query_interval_store(
}
static DEVICE_ATTR_RW(multicast_startup_query_interval);
#endif
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
static ssize_t nf_call_iptables_show(
struct device *d, struct device_attribute *attr, char *buf)
{
@ -763,7 +763,7 @@ static struct attribute *bridge_attrs[] = {
&dev_attr_multicast_query_response_interval.attr,
&dev_attr_multicast_startup_query_interval.attr,
#endif
#ifdef CONFIG_BRIDGE_NETFILTER
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
&dev_attr_nf_call_iptables.attr,
&dev_attr_nf_call_ip6tables.attr,
&dev_attr_nf_call_arptables.attr,