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-rw-r--r--include/net/netfilter/nf_conntrack.h6
-rw-r--r--net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c4
2 files changed, 9 insertions, 1 deletions
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index c7c42e7..5d4f8e5 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -307,6 +307,12 @@ static inline int nf_ct_is_untracked(const struct nf_conn *ct)
return test_bit(IPS_UNTRACKED_BIT, &ct->status);
}
+/* Packet is received from loopback */
+static inline bool nf_is_loopback_packet(const struct sk_buff *skb)
+{
+ return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK;
+}
+
extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp);
extern unsigned int nf_conntrack_htable_size;
extern unsigned int nf_conntrack_max;
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index db10075..de9da21 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -121,7 +121,9 @@ static unsigned int ipv4_confirm(unsigned int hooknum,
return ret;
}
- if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status)) {
+ /* adjust seqs for loopback traffic only in outgoing direction */
+ if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
+ !nf_is_loopback_packet(skb)) {
typeof(nf_nat_seq_adjust_hook) seq_adjust;
seq_adjust = rcu_dereference(nf_nat_seq_adjust_hook);
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