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[NETFILTER]: nf_nat: don't add NAT extension for confirmed conntracks

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Adding extensions to confirmed conntracks is not allowed to avoid races
on reallocation. Don't setup NAT for confirmed conntracks in case NAT
module is loaded late.

The has one side-effect, the connections existing before the NAT module
was loaded won't enter the bysource hash. The only case where this actually
makes a difference is in case of SNAT to a multirange where the IP before
NAT is also part of the range. Since old connections don't enter the
bysource hash the first new connection from the IP will have a new address
selected. This shouldn't matter at all.

Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Patrick McHardy
2008-04-14 11:15:51 +02:00
parent 42cf800c24
commit 8c87238b72
3 changed files with 4 additions and 26 deletions
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3
include/net/netfilter/nf_nat_rule.h
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@@ -14,7 +14,4 @@ extern int nf_nat_rule_find(struct sk_buff *skb,
extern unsigned int
alloc_null_binding(struct nf_conn *ct, unsigned int hooknum);
extern unsigned int
alloc_null_binding_confirmed(struct nf_conn *ct, unsigned int hooknum);
#endif /* _NF_NAT_RULE_H */