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net: add CONFIG_NET_INGRESS to enable ingress filtering

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This new config switch enables the ingress filtering infrastructure that is
controlled through the ingress_needed static key. This prepares the
introduction of the Netfilter ingress hook that resides under this unique
static key.

Note that CONFIG_SCH_INGRESS automatically selects this, that should be no
problem since this also depends on CONFIG_NET_CLS_ACT.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pablo Neira 2015-05-13 18:19:37 +02:00 committed by David S. Miller
parent b8d0aad0c7
commit 1cf51900f8
4 changed files with 9 additions and 4 deletions
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2
include/linux/rtnetlink.h
View File

@ -79,7 +79,7 @@ static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);
#ifdef CONFIG_NET_CLS_ACT
#ifdef CONFIG_NET_INGRESS
void net_inc_ingress_queue(void);
void net_dec_ingress_queue(void);
#endif

3
net/Kconfig
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@ -45,6 +45,9 @@ config COMPAT_NETLINK_MESSAGES
Newly written code should NEVER need this option but do
compat-independent messages instead!
config NET_INGRESS
bool
menu "Networking options"
source "net/packet/Kconfig"

7
net/core/dev.c
View File

@ -1630,7 +1630,7 @@ int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
}
EXPORT_SYMBOL(call_netdevice_notifiers);
#ifdef CONFIG_NET_CLS_ACT
#ifdef CONFIG_NET_INGRESS
static struct static_key ingress_needed __read_mostly;
void net_inc_ingress_queue(void)
@ -3798,13 +3798,14 @@ static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc)
}
skip_taps:
#ifdef CONFIG_NET_CLS_ACT
#ifdef CONFIG_NET_INGRESS
if (static_key_false(&ingress_needed)) {
skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
if (!skb)
goto unlock;
}
#endif
#ifdef CONFIG_NET_CLS_ACT
skb->tc_verd = 0;
ncls:
#endif

1
net/sched/Kconfig
View File

@ -312,6 +312,7 @@ config NET_SCH_PIE
config NET_SCH_INGRESS
tristate "Ingress Qdisc"
depends on NET_CLS_ACT
select NET_INGRESS
---help---
Say Y here if you want to use classifiers for incoming packets.
If unsure, say Y.