From: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
net/netfilter/nf_conntrack_expect.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
index da95d74..130f1be 100644
--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c
@@ -24,6 +24,7 @@
#include <linux/moduleparam.h>
#include <linux/export.h>
#include <net/net_namespace.h>
+#include <net/netns/hash.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
@@ -73,15 +74,17 @@ static void nf_ct_expectation_timed_out(unsigned long ul_expect)
nf_ct_expect_put(exp);
}
-static unsigned int nf_ct_expect_dst_hash(const struct nf_conntrack_tuple *tuple)
+static unsigned int nf_ct_expect_dst_hash(const struct net *n, const struct nf_conntrack_tuple *tuple)
{
- unsigned int hash;
+ unsigned int hash, seed;
get_random_once(&nf_ct_expect_hashrnd, sizeof(nf_ct_expect_hashrnd));
+ seed = nf_ct_expect_hashrnd ^ net_hash_mix(n);
+
hash = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all),
(((tuple->dst.protonum ^ tuple->src.l3num) << 16) |
- (__force __u16)tuple->dst.u.all) ^ nf_ct_expect_hashrnd);
+ (__force __u16)tuple->dst.u.all) ^ seed);
return reciprocal_scale(hash, nf_ct_expect_hsize);
}
@@ -108,7 +111,7 @@ __nf_ct_expect_find(struct net *net,
if (!net->ct.expect_count)
return NULL;
- h = nf_ct_expect_dst_hash(tuple);
+ h = nf_ct_expect_dst_hash(net, tuple);
hlist_for_each_entry_rcu(i, &net->ct.expect_hash[h], hnode) {
if (nf_ct_exp_equal(tuple, i, zone, net))
return i;
@@ -148,7 +151,7 @@ nf_ct_find_expectation(struct net *net,
if (!net->ct.expect_count)
return NULL;
- h = nf_ct_expect_dst_hash(tuple);
+ h = nf_ct_expect_dst_hash(net, tuple);
hlist_for_each_entry(i, &net->ct.expect_hash[h], hnode) {
if (!(i->flags & NF_CT_EXPECT_INACTIVE) &&
nf_ct_exp_equal(tuple, i, zone, net)) {
@@ -352,7 +355,7 @@ static int nf_ct_expect_insert(struct nf_conntrack_expect *exp)
struct nf_conn_help *master_help = nfct_help(exp->master);
struct nf_conntrack_helper *helper;
struct net *net = nf_ct_exp_net(exp);
- unsigned int h = nf_ct_expect_dst_hash(&exp->tuple);
+ unsigned int h = nf_ct_expect_dst_hash(net, &exp->tuple);
/* two references : one for hash insert, one for the timer */
atomic_add(2, &exp->use);
@@ -411,7 +414,7 @@ static inline int __nf_ct_expect_check(struct nf_conntrack_expect *expect)
ret = -ESHUTDOWN;
goto out;
}
- h = nf_ct_expect_dst_hash(&expect->tuple);
+ h = nf_ct_expect_dst_hash(net, &expect->tuple);
hlist_for_each_entry_safe(i, next, &net->ct.expect_hash[h], hnode) {
if (expect_matches(i, expect)) {
if (del_timer(&i->timeout)) {
--
2.1.4
--
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