2 files changed, 9 insertions, 0 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 1fd0a3d775d2..bdcee6981c60 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -4353,6 +4353,14 @@ static struct addrconf_sysctl_table
                         .proc_handler   =       proc_dointvec,
                 },
                 {
+                        .ctl_name       = CTL_UNNUMBERED,
+                        .procname       = "force_tllao",
+                        .data           = &ipv6_devconf.force_tllao,
+                        .maxlen         = sizeof(int),
+                        .mode           = 0644,
+                        .proc_handler   = proc_dointvec
+                },
+                {
                         .ctl_name       =       0,      /* sentinel */
                 }
         },
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index f74e4e2cdd06..3507cfe1e7a2 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -598,6 +598,7 @@ static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
         icmp6h.icmp6_solicited = solicited;
         icmp6h.icmp6_override = override;
 
+        inc_opt |= ifp->idev->cnf.force_tllao;
         __ndisc_send(dev, neigh, daddr, src_addr,
                      &icmp6h, solicited_addr,
                      inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);