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authorPatrick McHardy <kaber@trash.net>2007-02-12 20:13:14 +0100
committerDavid S. Miller <davem@davemloft.net>2007-02-12 20:13:14 +0100
commitabbaccda4c364815b8b1a82c45a94f60760e13e1 (patch)
tree58e28cc25db59456092fc760b7a29e6d223610c5 /include
parent[NETFILTER]: nf_conntrack: properly use RCU API for nf_ct_protos/nf_ct_l3prot... (diff)
downloadlinux-abbaccda4c364815b8b1a82c45a94f60760e13e1.tar.xz
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[NETFILTER]: ip_conntrack: fix invalid conntrack statistics RCU assumption
CONNTRACK_STAT_INC assumes rcu_read_lock in nf_hook_slow disables preemption as well, making it legal to use __get_cpu_var without disabling preemption manually. The assumption is not correct anymore with preemptable RCU, additionally we need to protect against softirqs when not holding ip_conntrack_lock. Add CONNTRACK_STAT_INC_ATOMIC macro, which disables local softirqs, and use where necessary. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/netfilter_ipv4/ip_conntrack.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/netfilter_ipv4/ip_conntrack.h b/include/linux/netfilter_ipv4/ip_conntrack.h
index 33581c13d947..da9274e6bf12 100644
--- a/include/linux/netfilter_ipv4/ip_conntrack.h
+++ b/include/linux/netfilter_ipv4/ip_conntrack.h
@@ -301,6 +301,12 @@ extern unsigned int ip_conntrack_htable_size;
extern int ip_conntrack_checksum;
#define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++)
+#define CONNTRACK_STAT_INC_ATOMIC(count) \
+do { \
+ local_bh_disable(); \
+ __get_cpu_var(ip_conntrack_stat).count++; \
+ local_bh_enable(); \
+} while (0)
#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
#include <linux/notifier.h>