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| author | Patrick McHardy <kaber@trash.net> | 2007-02-12 22:13:43 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2007-02-12 22:13:43 +0300 |
| commit | c0e912d7ed8999f87fa7f084928aac1266e251f3 (patch) | |
| tree | ec48a83001871b4e0db78ee9eab520a1fbb02e14 /net | |
| parent | abbaccda4c364815b8b1a82c45a94f60760e13e1 (diff) | |
| download | linux-c0e912d7ed8999f87fa7f084928aac1266e251f3.tar.xz | |
[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.c | 4 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_core.c | 14 |
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; } |