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author | Patrick McHardy <kaber@trash.net> | 2007-07-08 09:33:47 +0400 |
---|---|---|
committer | David S. Miller <davem@sunset.davemloft.net> | 2007-07-11 09:17:59 +0400 |
commit | a71c085562bcc99e8b711cab4222bff1f6e955da (patch) | |
tree | 7de563d406e8e9e44065b53c664f837f97f8b3fe /include/net/netfilter/nf_conntrack_core.h | |
parent | e9c1b084e17ca225b6be731b819308ee0f9e04b8 (diff) | |
download | linux-a71c085562bcc99e8b711cab4222bff1f6e955da.tar.xz |
[NETFILTER]: nf_conntrack: use hashtable for expectations
Currently all expectations are kept on a global list that
- needs to be searched for every new conncetion
- needs to be walked for evicting expectations when a master connection
has reached its limit
- needs to be walked on connection destruction for connections that
have open expectations
This is obviously not good, especially when considering helpers like
H.323 that register *lots* of expectations and can set up permanent
expectations, but it also allows for an easy DoS against firewalls
using connection tracking helpers.
Use a hashtable for expectations to avoid incurring the search overhead
for every new connection. The default hash size is 1/256 of the conntrack
hash table size, this can be overriden using a module parameter.
This patch only introduces the hash table for expectation lookups and
keeps other users to reduce the noise, the following patches will get
rid of it completely.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/netfilter/nf_conntrack_core.h')
-rw-r--r-- | include/net/netfilter/nf_conntrack_core.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/net/netfilter/nf_conntrack_core.h b/include/net/netfilter/nf_conntrack_core.h index a18f79c80db8..4056f5f08da1 100644 --- a/include/net/netfilter/nf_conntrack_core.h +++ b/include/net/netfilter/nf_conntrack_core.h @@ -84,7 +84,6 @@ print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple, struct nf_conntrack_l4proto *proto); extern struct hlist_head *nf_conntrack_hash; -extern struct list_head nf_ct_expect_list; extern rwlock_t nf_conntrack_lock ; extern struct hlist_head unconfirmed; |