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| author |   Eric Dumazet <eric.dumazet@gmail.com> | 2010-06-08 16:09:52 +0200 |
|---|---|---|
| committer |   Patrick McHardy <kaber@trash.net> | 2010-06-08 16:09:52 +0200 |
| commit | 5bfddbd46a95c978f4d3c992339cbdf4f4b790a3 (patch) | |
| tree | 9291ba4e1e3c7bf7ae8b5dfa8271e7127a6a6958 /include | |
| parent | netfilter: xt_rateest: Better struct xt_rateest layout (diff) | |
| download | linux-dev-5bfddbd46a95c978f4d3c992339cbdf4f4b790a3.tar.xz linux-dev-5bfddbd46a95c978f4d3c992339cbdf4f4b790a3.zip | |
netfilter: nf_conntrack: IPS_UNTRACKED bit
NOTRACK makes all cpus share a cache line on nf_conntrack_untracked
twice per packet. This is bad for performance.
__read_mostly annotation is also a bad choice.
This patch introduces IPS_UNTRACKED bit so that we can use later a
per_cpu untrack structure more easily.
A new helper, nf_ct_untracked_get() returns a pointer to
nf_conntrack_untracked.
Another one, nf_ct_untracked_status_or() is used by nf_nat_init() to add
IPS_NAT_DONE_MASK bits to untracked status.
nf_ct_is_untracked() prototype is changed to work on a nf_conn pointer.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netfilter/nf_conntrack_common.h | 4 | ||||
| -rw-r--r-- | include/net/netfilter/nf_conntrack.h | 12 | ||||
| -rw-r--r-- | include/net/netfilter/nf_conntrack_core.h | 2 |
3 files changed, 14 insertions, 4 deletions
diff --git a/include/linux/netfilter/nf_conntrack_common.h b/include/linux/netfilter/nf_conntrack_common.h index 14e6d32002c4..1afd18c855ec 100644 --- a/include/linux/netfilter/nf_conntrack_common.h +++ b/include/linux/netfilter/nf_conntrack_common.h @@ -76,6 +76,10 @@ enum ip_conntrack_status { /* Conntrack is a template */ IPS_TEMPLATE_BIT = 11, IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT), + + /* Conntrack is a fake untracked entry */ + IPS_UNTRACKED_BIT = 12, + IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT), }; /* Connection tracking event types */ diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h index bde095f7e845..3bc38c70bbbe 100644 --- a/include/net/netfilter/nf_conntrack.h +++ b/include/net/netfilter/nf_conntrack.h @@ -261,7 +261,13 @@ extern s16 (*nf_ct_nat_offset)(const struct nf_conn *ct, u32 seq); /* Fake conntrack entry for untracked connections */ -extern struct nf_conn nf_conntrack_untracked; +static inline struct nf_conn *nf_ct_untracked_get(void) +{ + extern struct nf_conn nf_conntrack_untracked; + + return &nf_conntrack_untracked; +} +extern void nf_ct_untracked_status_or(unsigned long bits); /* Iterate over all conntracks: if iter returns true, it's deleted. */ extern void @@ -289,9 +295,9 @@ static inline int nf_ct_is_dying(struct nf_conn *ct) return test_bit(IPS_DYING_BIT, &ct->status); } -static inline int nf_ct_is_untracked(const struct sk_buff *skb) +static inline int nf_ct_is_untracked(const struct nf_conn *ct) { - return (skb->nfct == &nf_conntrack_untracked.ct_general); + return test_bit(IPS_UNTRACKED_BIT, &ct->status); } extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp); diff --git a/include/net/netfilter/nf_conntrack_core.h b/include/net/netfilter/nf_conntrack_core.h index 3d7524fba194..aced085132e7 100644 --- a/include/net/netfilter/nf_conntrack_core.h +++ b/include/net/netfilter/nf_conntrack_core.h @@ -60,7 +60,7 @@ static inline int nf_conntrack_confirm(struct sk_buff *skb) struct nf_conn *ct = (struct nf_conn *)skb->nfct; int ret = NF_ACCEPT; - if (ct && ct != &nf_conntrack_untracked) { + if (ct && !nf_ct_is_untracked(ct)) { if (!nf_ct_is_confirmed(ct)) ret = __nf_conntrack_confirm(skb); if (likely(ret == NF_ACCEPT)) |