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authorPatrick McHardy <kaber@trash.net>2007-02-12 11:13:43 -0800
committerDavid S. Miller <davem@davemloft.net>2007-02-12 11:13:43 -0800
commitc0e912d7ed8999f87fa7f084928aac1266e251f3 (patch)
treeec48a83001871b4e0db78ee9eab520a1fbb02e14 /net
parent[NETFILTER]: ip_conntrack: fix invalid conntrack statistics RCU assumption (diff)
downloadlinux-dev-c0e912d7ed8999f87fa7f084928aac1266e251f3.tar.xz
linux-dev-c0e912d7ed8999f87fa7f084928aac1266e251f3.zip
[NETFILTER]: nf_conntrack: fix invalid conntrack statistics RCU assumption
NF_CT_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 nf_conntrack_lock. Add NF_CT_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 'net')
-rw-r--r--net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c4
-rw-r--r--net/netfilter/nf_conntrack_core.c14
2 files changed, 9 insertions, 9 deletions
diff --git a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
index a2353edf4ebc..4b7be4bb4d03 100644
--- a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
@@ -154,8 +154,8 @@ ipv6_prepare(struct sk_buff **pskb, unsigned int hooknum, unsigned int *dataoff,
*/
if ((protoff < 0) || (protoff > (*pskb)->len)) {
DEBUGP("ip6_conntrack_core: can't find proto in pkt\n");
- NF_CT_STAT_INC(error);
- NF_CT_STAT_INC(invalid);
+ NF_CT_STAT_INC_ATOMIC(error);
+ NF_CT_STAT_INC_ATOMIC(invalid);
return -NF_ACCEPT;
}
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 3deeb900263b..d59640e2377b 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -563,7 +563,7 @@ static int early_drop(struct list_head *chain)
if (del_timer(&ct->timeout)) {
death_by_timeout((unsigned long)ct);
dropped = 1;
- NF_CT_STAT_INC(early_drop);
+ NF_CT_STAT_INC_ATOMIC(early_drop);
}
nf_ct_put(ct);
return dropped;
@@ -821,7 +821,7 @@ nf_conntrack_in(int pf, unsigned int hooknum, struct sk_buff **pskb)
/* Previously seen (loopback or untracked)? Ignore. */
if ((*pskb)->nfct) {
- NF_CT_STAT_INC(ignore);
+ NF_CT_STAT_INC_ATOMIC(ignore);
return NF_ACCEPT;
}
@@ -840,8 +840,8 @@ nf_conntrack_in(int pf, unsigned int hooknum, struct sk_buff **pskb)
* core what to do with the packet. */
if (l4proto->error != NULL &&
(ret = l4proto->error(*pskb, dataoff, &ctinfo, pf, hooknum)) <= 0) {
- NF_CT_STAT_INC(error);
- NF_CT_STAT_INC(invalid);
+ NF_CT_STAT_INC_ATOMIC(error);
+ NF_CT_STAT_INC_ATOMIC(invalid);
return -ret;
}
@@ -849,13 +849,13 @@ nf_conntrack_in(int pf, unsigned int hooknum, struct sk_buff **pskb)
&set_reply, &ctinfo);
if (!ct) {
/* Not valid part of a connection */
- NF_CT_STAT_INC(invalid);
+ NF_CT_STAT_INC_ATOMIC(invalid);
return NF_ACCEPT;
}
if (IS_ERR(ct)) {
/* Too stressed to deal. */
- NF_CT_STAT_INC(drop);
+ NF_CT_STAT_INC_ATOMIC(drop);
return NF_DROP;
}
@@ -868,7 +868,7 @@ nf_conntrack_in(int pf, unsigned int hooknum, struct sk_buff **pskb)
DEBUGP("nf_conntrack_in: Can't track with proto module\n");
nf_conntrack_put((*pskb)->nfct);
(*pskb)->nfct = NULL;
- NF_CT_STAT_INC(invalid);
+ NF_CT_STAT_INC_ATOMIC(invalid);
return -ret;
}