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netfilter: merge ctinfo into nfct pointer storage area

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After this change conntrack operations (lookup, creation, matching from
ruleset) only access one instead of two sk_buff cache lines.

This works for normal conntracks because those are allocated from a slab
that guarantees hw cacheline or 8byte alignment (whatever is larger)
so the 3 bits needed for ctinfo won't overlap with nf_conn addresses.

Template allocation now does manual address alignment (see previous change)
on arches that don't have sufficent kmalloc min alignment.

Some spots intentionally use skb->_nfct instead of skb_nfct() helpers,
this is to avoid undoing the skb_nfct() use when we remove untracked
conntrack object in the future.

Signed-off-by: Florian Westphal <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
This commit is contained in:
Florian Westphal 2017-01-23 18:21:59 +01:00 • committed by Pablo Neira Ayuso
commit a9e419dc7b
7 changed files with 28 additions and 26 deletions
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2
net/ipv6/netfilter/nf_dup_ipv6.c
View file

@ -59,7 +59,7 @@ void nf_dup_ipv6(struct net *net, struct sk_buff *skb, unsigned int hooknum,
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
nf_reset(skb);
nf_ct_set(skb, nf_ct_untracked_get(), IP_CT_NEW);
nf_conntrack_get(skb->nfct);
nf_conntrack_get(skb_nfct(skb));
#endif
if (hooknum == NF_INET_PRE_ROUTING ||
hooknum == NF_INET_LOCAL_IN) {