[IPV4]: Remove unsupported DNAT (RTCF_NAT and RTCF_NAT) in IPV4

- The DNAT (Destination NAT) is not implemented in IPV4.

- This patch remove the code which checks these flags
in net/ipv4/arp.c and net/ipv4/route.c.

The RTCF_NAT and RTCF_NAT should stay in the header (linux/in_route.h)
because they are used in DECnet.

Signed-off-by: Rami Rosen <ramirose@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 3 deletions

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 9eb6d3ab2977..46edf1c32a40 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -835,9 +835,8 @@ static int arp_process(struct sk_buff *skb)
                         }
                         goto out;
                 } else if (IN_DEV_FORWARD(in_dev)) {
-                        if ((rt->rt_flags&RTCF_DNAT) ||
-                            (addr_type == RTN_UNICAST  && rt->u.dst.dev != dev &&
-                             (arp_fwd_proxy(in_dev, rt) || pneigh_lookup(&arp_tbl, &init_net, &tip, dev, 0)))) {
+                            if (addr_type == RTN_UNICAST  && rt->u.dst.dev != dev &&
+                             (arp_fwd_proxy(in_dev, rt) || pneigh_lookup(&arp_tbl, &init_net, &tip, dev, 0))) {
                                 n = neigh_event_ns(&arp_tbl, sha, &sip, dev);
                                 if (n)
                                         neigh_release(n);