OpenWrt – Rev 4
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From 2a95183a5e0375df756efb2ca37602d71e8455f9 Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw@strlen.de>
Date: Thu, 7 Dec 2017 16:28:26 +0100
Subject: [PATCH 08/11] netfilter: don't allocate space for arp/bridge hooks
unless needed
no need to define hook points if the family isn't supported.
Because we need these hooks for either nftables, arp/ebtables
or the 'call-iptables' hack we have in the bridge layer add two
new dependencies, NETFILTER_FAMILY_{ARP,BRIDGE}, and have the
users select them.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/linux/netfilter.h | 4 ++++
include/net/netns/netfilter.h | 4 ++++
net/Kconfig | 1 +
net/bridge/netfilter/Kconfig | 2 ++
net/ipv4/netfilter/Kconfig | 2 ++
net/netfilter/Kconfig | 6 ++++++
net/netfilter/core.c | 8 ++++++++
net/netfilter/nf_queue.c | 2 ++
8 files changed, 29 insertions(+)
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -214,10 +214,14 @@ static inline int nf_hook(u_int8_t pf, u
hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]);
break;
case NFPROTO_ARP:
+#ifdef CONFIG_NETFILTER_FAMILY_ARP
hook_head = rcu_dereference(net->nf.hooks_arp[hook]);
+#endif
break;
case NFPROTO_BRIDGE:
+#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
hook_head = rcu_dereference(net->nf.hooks_bridge[hook]);
+#endif
break;
#if IS_ENABLED(CONFIG_DECNET)
case NFPROTO_DECNET:
--- a/include/net/netns/netfilter.h
+++ b/include/net/netns/netfilter.h
@@ -19,8 +19,12 @@ struct netns_nf {
#endif
struct nf_hook_entries __rcu *hooks_ipv4[NF_INET_NUMHOOKS];
struct nf_hook_entries __rcu *hooks_ipv6[NF_INET_NUMHOOKS];
+#ifdef CONFIG_NETFILTER_FAMILY_ARP
struct nf_hook_entries __rcu *hooks_arp[NF_ARP_NUMHOOKS];
+#endif
+#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
struct nf_hook_entries __rcu *hooks_bridge[NF_INET_NUMHOOKS];
+#endif
#if IS_ENABLED(CONFIG_DECNET)
struct nf_hook_entries __rcu *hooks_decnet[NF_DN_NUMHOOKS];
#endif
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -182,6 +182,7 @@ config BRIDGE_NETFILTER
depends on BRIDGE
depends on NETFILTER && INET
depends on NETFILTER_ADVANCED
+ select NETFILTER_FAMILY_BRIDGE
default m
---help---
Enabling this option will let arptables resp. iptables see bridged
--- a/net/bridge/netfilter/Kconfig
+++ b/net/bridge/netfilter/Kconfig
@@ -4,6 +4,7 @@
#
menuconfig NF_TABLES_BRIDGE
depends on BRIDGE && NETFILTER && NF_TABLES
+ select NETFILTER_FAMILY_BRIDGE
tristate "Ethernet Bridge nf_tables support"
if NF_TABLES_BRIDGE
@@ -29,6 +30,7 @@ endif # NF_TABLES_BRIDGE
menuconfig BRIDGE_NF_EBTABLES
tristate "Ethernet Bridge tables (ebtables) support"
depends on BRIDGE && NETFILTER && NETFILTER_XTABLES
+ select NETFILTER_FAMILY_BRIDGE
help
ebtables is a general, extensible frame/packet identification
framework. Say 'Y' or 'M' here if you want to do Ethernet
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -72,6 +72,7 @@ endif # NF_TABLES_IPV4
config NF_TABLES_ARP
tristate "ARP nf_tables support"
+ select NETFILTER_FAMILY_ARP
help
This option enables the ARP support for nf_tables.
@@ -392,6 +393,7 @@ endif # IP_NF_IPTABLES
config IP_NF_ARPTABLES
tristate "ARP tables support"
select NETFILTER_XTABLES
+ select NETFILTER_FAMILY_ARP
depends on NETFILTER_ADVANCED
help
arptables is a general, extensible packet identification framework.
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -12,6 +12,12 @@ config NETFILTER_INGRESS
config NETFILTER_NETLINK
tristate
+config NETFILTER_FAMILY_BRIDGE
+ bool
+
+config NETFILTER_FAMILY_ARP
+ bool
+
config NETFILTER_NETLINK_ACCT
tristate "Netfilter NFACCT over NFNETLINK interface"
depends on NETFILTER_ADVANCED
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -267,14 +267,18 @@ static struct nf_hook_entries __rcu **nf
switch (reg->pf) {
case NFPROTO_NETDEV:
break;
+#ifdef CONFIG_NETFILTER_FAMILY_ARP
case NFPROTO_ARP:
if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_arp) <= reg->hooknum))
return NULL;
return net->nf.hooks_arp + reg->hooknum;
+#endif
+#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
case NFPROTO_BRIDGE:
if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_bridge) <= reg->hooknum))
return NULL;
return net->nf.hooks_bridge + reg->hooknum;
+#endif
case NFPROTO_IPV4:
if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_ipv4) <= reg->hooknum))
return NULL;
@@ -573,8 +577,12 @@ static int __net_init netfilter_net_init
{
__netfilter_net_init(net->nf.hooks_ipv4, ARRAY_SIZE(net->nf.hooks_ipv4));
__netfilter_net_init(net->nf.hooks_ipv6, ARRAY_SIZE(net->nf.hooks_ipv6));
+#ifdef CONFIG_NETFILTER_FAMILY_ARP
__netfilter_net_init(net->nf.hooks_arp, ARRAY_SIZE(net->nf.hooks_arp));
+#endif
+#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
__netfilter_net_init(net->nf.hooks_bridge, ARRAY_SIZE(net->nf.hooks_bridge));
+#endif
#if IS_ENABLED(CONFIG_DECNET)
__netfilter_net_init(net->nf.hooks_decnet, ARRAY_SIZE(net->nf.hooks_decnet));
#endif
--- a/net/netfilter/nf_queue.c
+++ b/net/netfilter/nf_queue.c
@@ -204,8 +204,10 @@ repeat:
static struct nf_hook_entries *nf_hook_entries_head(const struct net *net, u8 pf, u8 hooknum)
{
switch (pf) {
+#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
case NFPROTO_BRIDGE:
return rcu_dereference(net->nf.hooks_bridge[hooknum]);
+#endif
case NFPROTO_IPV4:
return rcu_dereference(net->nf.hooks_ipv4[hooknum]);
case NFPROTO_IPV6: