2 files changed, 20 insertions, 5 deletions

diff --git a/include/linux/mroute.h b/include/linux/mroute.h
index 08bc776d05e2..d5f69151f692 100644
--- a/include/linux/mroute.h
+++ b/include/linux/mroute.h
@@ -59,13 +59,18 @@ struct vifctl {
         unsigned char vifc_flags;       /* VIFF_ flags */
         unsigned char vifc_threshold;   /* ttl limit */
         unsigned int vifc_rate_limit;   /* Rate limiter values (NI) */
-        struct in_addr vifc_lcl_addr;   /* Our address */
+        union {
+                struct in_addr vifc_lcl_addr;     /* Local interface address */
+                int            vifc_lcl_ifindex;  /* Local interface index   */
+        };
         struct in_addr vifc_rmt_addr;   /* IPIP tunnel addr */
 };
 
-#define VIFF_TUNNEL     0x1     /* IPIP tunnel */
-#define VIFF_SRCRT      0x2     /* NI */
-#define VIFF_REGISTER   0x4     /* register vif */
+#define VIFF_TUNNEL             0x1     /* IPIP tunnel */
+#define VIFF_SRCRT              0x2     /* NI */
+#define VIFF_REGISTER           0x4     /* register vif */
+#define VIFF_USE_IFINDEX        0x8     /* use vifc_lcl_ifindex instead of
+                                           vifc_lcl_addr to find an interface */
 
 /*
  *      Cache manipulation structures for mrouted and PIMd
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 630a56df7b47..c757f0b4b74c 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -469,8 +469,18 @@ static int vif_add(struct net *net, struct vifctl *vifc, int mrtsock)
                         return err;
                 }
                 break;
+
+        case VIFF_USE_IFINDEX:
         case 0:
-                dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
+                if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
+                        dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
+                        if (dev && dev->ip_ptr == NULL) {
+                                dev_put(dev);
+                                return -EADDRNOTAVAIL;
+                        }
+                } else
+                        dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
+
                 if (!dev)
                         return -EADDRNOTAVAIL;
                 err = dev_set_allmulti(dev, 1);