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kernel: bypass all netfilter hooks if the sysctls for that functionality have been disabled - eliminates the overhead of enabling CONFIG_BRIDGE_NETFILTER in the kernel config

Browse Source 
SVN-Revision: 30917
v19.07.3_mercusys_ac12_duma
Felix Fietkau 12 years ago
parent 5744d736f2
commit b387cfd6e4
2 changed files with 152 additions and 0 deletions
Show Stats Download Patch File Download Diff File

76
target/linux/generic/patches-3.2/644-bridge_optimize_netfilter_hooks.patch
Unescape Escape View File

@ -0,0 +1,76 @@
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -62,6 +62,11 @@ static int brnf_filter_pppoe_tagged __re
#define brnf_filter_pppoe_tagged 0
#endif
+bool br_netfilter_run_hooks(void)
+{
+ return brnf_call_iptables | brnf_call_ip6tables | brnf_call_arptables;
+}
+
static inline __be16 vlan_proto(const struct sk_buff *skb)
{
if (vlan_tx_tag_present(skb))
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -491,10 +491,12 @@ static inline bool br_multicast_is_route
extern int br_netfilter_init(void);
extern void br_netfilter_fini(void);
extern void br_netfilter_rtable_init(struct net_bridge *);
+extern bool br_netfilter_run_hooks(void);
#else
#define br_netfilter_init() (0)
#define br_netfilter_fini() do { } while(0)
#define br_netfilter_rtable_init(x)
+#define br_netfilter_run_hooks() false
#endif
/* br_stp.c */
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -26,6 +26,17 @@ const u8 br_group_address[ETH_ALEN] = {
br_should_route_hook_t __rcu *br_should_route_hook __read_mostly;
EXPORT_SYMBOL(br_should_route_hook);
+static inline int
+BR_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb,
+ struct net_device *in, struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ if (!br_netfilter_run_hooks())
+ return okfn(skb);
+
+ return NF_HOOK(pf, hook, skb, in, out, okfn);
+}
+
static int br_pass_frame_up(struct sk_buff *skb)
{
struct net_device *indev, *brdev = BR_INPUT_SKB_CB(skb)->brdev;
@@ -40,7 +51,7 @@ static int br_pass_frame_up(struct sk_bu
indev = skb->dev;
skb->dev = brdev;
- return NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
+ return BR_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
netif_receive_skb);
}
@@ -199,7 +210,7 @@ rx_handler_result_t br_handle_frame(stru
}
/* Deliver packet to local host only */
- if (NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
+ if (BR_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
NULL, br_handle_local_finish)) {
return RX_HANDLER_CONSUMED; /* consumed by filter */
} else {
@@ -224,7 +235,7 @@ forward:
if (!compare_ether_addr(p->br->dev->dev_addr, dest))
skb->pkt_type = PACKET_HOST;
- NF_HOOK(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
+ BR_HOOK(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
br_handle_frame_finish);
break;
default:

76
target/linux/generic/patches-3.3/644-bridge_optimize_netfilter_hooks.patch
Unescape Escape View File

@ -0,0 +1,76 @@
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -26,6 +26,17 @@ const u8 br_group_address[ETH_ALEN] = {
br_should_route_hook_t __rcu *br_should_route_hook __read_mostly;
EXPORT_SYMBOL(br_should_route_hook);
+static inline int
+BR_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb,
+ struct net_device *in, struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ if (!br_netfilter_run_hooks())
+ return okfn(skb);
+
+ return NF_HOOK(pf, hook, skb, in, out, okfn);
+}
+
static int br_pass_frame_up(struct sk_buff *skb)
{
struct net_device *indev, *brdev = BR_INPUT_SKB_CB(skb)->brdev;
@@ -40,7 +51,7 @@ static int br_pass_frame_up(struct sk_bu
indev = skb->dev;
skb->dev = brdev;
- return NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
+ return BR_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
netif_receive_skb);
}
@@ -194,7 +205,7 @@ rx_handler_result_t br_handle_frame(stru
}
/* Deliver packet to local host only */
- if (NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
+ if (BR_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
NULL, br_handle_local_finish)) {
return RX_HANDLER_CONSUMED; /* consumed by filter */
} else {
@@ -219,7 +230,7 @@ forward:
if (!compare_ether_addr(p->br->dev->dev_addr, dest))
skb->pkt_type = PACKET_HOST;
- NF_HOOK(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
+ BR_HOOK(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
br_handle_frame_finish);
break;
default:
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -62,6 +62,11 @@ static int brnf_filter_pppoe_tagged __re
#define brnf_filter_pppoe_tagged 0
#endif
+bool br_netfilter_run_hooks(void)
+{
+ return brnf_call_iptables | brnf_call_ip6tables | brnf_call_arptables;
+}
+
static inline __be16 vlan_proto(const struct sk_buff *skb)
{
if (vlan_tx_tag_present(skb))
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -492,10 +492,12 @@ static inline bool br_multicast_is_route
extern int br_netfilter_init(void);
extern void br_netfilter_fini(void);
extern void br_netfilter_rtable_init(struct net_bridge *);
+extern bool br_netfilter_run_hooks(void);
#else
#define br_netfilter_init() (0)
#define br_netfilter_fini() do { } while(0)
#define br_netfilter_rtable_init(x)
+#define br_netfilter_run_hooks() false
#endif
/* br_stp.c */
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