netfilter: xt_connlimit: pick right dstaddr in NAT scenario

xt_connlimit normally records the "original" tuples in a hashlist
(such as "1.2.3.4 -> 5.6.7.8"), and looks in this list for iph->daddr
when counting.

When the user however uses DNAT in PREROUTING, looking for
iph->daddr -- which is now 192.168.9.10 -- will not match. Thus in
daddr mode, we need to record the reverse direction tuple
("192.168.9.10 -> 1.2.3.4") instead. In the reverse tuple, the dst
addr is on the src side, which is convenient, as count_them still uses
&conn->tuple.src.u3.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

1 files changed, 8 insertions, 4 deletions

diff --git a/net/netfilter/xt_connlimit.c b/net/netfilter/xt_connlimit.c
index 7fd3fd51f27..e029c480740 100644
--- a/net/netfilter/xt_connlimit.c
+++ b/net/netfilter/xt_connlimit.c
@@ -185,11 +185,15 @@ connlimit_mt(const struct sk_buff *skb, struct xt_action_param *par)
         int connections;
 
         ct = nf_ct_get(skb, &ctinfo);
-        if (ct != NULL)
-                tuple_ptr = &ct->tuplehash[0].tuple;
-        else if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
-                                    par->family, &tuple))
+        if (ct != NULL) {
+                if (info->flags & XT_CONNLIMIT_DADDR)
+                        tuple_ptr = &ct->tuplehash[IP_CT_DIR_REPLY].tuple;
+                else
+                        tuple_ptr = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
+        } else if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
+                                    par->family, &tuple)) {
                 goto hotdrop;
+        }
 
         if (par->family == NFPROTO_IPV6) {
                 const struct ipv6hdr *iph = ipv6_hdr(skb);