[IPV6] NDISC: Add proxy_ndp sysctl.

We do not always need proxy NDP functionality even we
enable forwarding.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 1 deletions

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index ddf038636f01..76517a5f6576 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -824,6 +824,7 @@ static void ndisc_recv_ns(struct sk_buff *skb)
 
                 if (ipv6_chk_acast_addr(dev, &msg->target) ||
                     (idev->cnf.forwarding && 
+                     (ipv6_devconf.proxy_ndp || idev->cnf.proxy_ndp) &&
                      (pneigh = pneigh_lookup(&nd_tbl,
                                              &msg->target, dev, 0)) != NULL)) {
                         if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
@@ -966,8 +967,13 @@ static void ndisc_recv_na(struct sk_buff *skb)
                  * has already sent a NA to us.
                  */
                 if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
-                    pneigh_lookup(&nd_tbl, &msg->target, dev, 0))
+                    ipv6_devconf.forwarding && ipv6_devconf.proxy_ndp &&
+                    pneigh_lookup(&nd_tbl, &msg->target, dev, 0)) {
+                        /* XXX: idev->cnf.prixy_ndp */
+                        WARN_ON(skb->dst != NULL &&
+                                ((struct rt6_info *)skb->dst)->rt6i_idev);
                         goto out;
+                }
 
                 neigh_update(neigh, lladdr,
                              msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,