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authorFlorian Westphal <fw@strlen.de>2016-05-02 19:39:55 +0300
committerPablo Neira Ayuso <pablo@netfilter.org>2016-05-05 17:39:47 +0300
commit56d52d4892d0e478a005b99ed10d0a7f488ea8c1 (patch)
tree89f2c12e4f197ac3876f5ebf01f61b7a3f49dd3e /net/ipv4
parent1b8c8a9f648c809c01a44114d7535ac8ca4c5ba3 (diff)
downloadlinux-56d52d4892d0e478a005b99ed10d0a7f488ea8c1.tar.xz
netfilter: conntrack: use a single hashtable for all namespaces
We already include netns address in the hash and compare the netns pointers during lookup, so even if namespaces have overlapping addresses entries will be spread across the table. Assuming 64k bucket size, this change saves 0.5 mbyte per namespace on a 64bit system. NAT bysrc and expectation hash is still per namespace, those will changed too soon. Future patch will also make conntrack object slab cache global again. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c2
-rw-r--r--net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c10
2 files changed, 5 insertions, 7 deletions
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index e3c46e8e2762..ae1a71a97132 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -360,7 +360,7 @@ static int ipv4_init_net(struct net *net)
in->ctl_table[0].data = &nf_conntrack_max;
in->ctl_table[1].data = &net->ct.count;
- in->ctl_table[2].data = &net->ct.htable_size;
+ in->ctl_table[2].data = &nf_conntrack_htable_size;
in->ctl_table[3].data = &net->ct.sysctl_checksum;
in->ctl_table[4].data = &net->ct.sysctl_log_invalid;
#endif
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
index 171aba15c952..f8fc7ab201c9 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
@@ -31,15 +31,14 @@ struct ct_iter_state {
static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
{
- struct net *net = seq_file_net(seq);
struct ct_iter_state *st = seq->private;
struct hlist_nulls_node *n;
for (st->bucket = 0;
- st->bucket < net->ct.htable_size;
+ st->bucket < nf_conntrack_htable_size;
st->bucket++) {
n = rcu_dereference(
- hlist_nulls_first_rcu(&net->ct.hash[st->bucket]));
+ hlist_nulls_first_rcu(&nf_conntrack_hash[st->bucket]));
if (!is_a_nulls(n))
return n;
}
@@ -49,17 +48,16 @@ static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
struct hlist_nulls_node *head)
{
- struct net *net = seq_file_net(seq);
struct ct_iter_state *st = seq->private;
head = rcu_dereference(hlist_nulls_next_rcu(head));
while (is_a_nulls(head)) {
if (likely(get_nulls_value(head) == st->bucket)) {
- if (++st->bucket >= net->ct.htable_size)
+ if (++st->bucket >= nf_conntrack_htable_size)
return NULL;
}
head = rcu_dereference(
- hlist_nulls_first_rcu(&net->ct.hash[st->bucket]));
+ hlist_nulls_first_rcu(&nf_conntrack_hash[st->bucket]));
}
return head;
}