1 files changed, 40 insertions, 26 deletions

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 8c2b2b0741da..160535b51705 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -651,6 +651,40 @@ tx_error:
         return 0;
 }
 
+static void ipip_tunnel_bind_dev(struct net_device *dev)
+{
+        struct net_device *tdev = NULL;
+        struct ip_tunnel *tunnel;
+        struct iphdr *iph;
+
+        tunnel = netdev_priv(dev);
+        iph = &tunnel->parms.iph;
+
+        if (iph->daddr) {
+                struct flowi fl = { .oif = tunnel->parms.link,
+                                    .nl_u = { .ip4_u =
+                                              { .daddr = iph->daddr,
+                                                .saddr = iph->saddr,
+                                                .tos = RT_TOS(iph->tos) } },
+                                    .proto = IPPROTO_IPIP };
+                struct rtable *rt;
+                if (!ip_route_output_key(&rt, &fl)) {
+                        tdev = rt->u.dst.dev;
+                        ip_rt_put(rt);
+                }
+                dev->flags |= IFF_POINTOPOINT;
+        }
+
+        if (!tdev && tunnel->parms.link)
+                tdev = __dev_get_by_index(&init_net, tunnel->parms.link);
+
+        if (tdev) {
+                dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
+                dev->mtu = tdev->mtu - sizeof(struct iphdr);
+        }
+        dev->iflink = tunnel->parms.link;
+}
+
 static int
 ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 {
@@ -723,6 +757,11 @@ ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
                                 t->parms.iph.ttl = p.iph.ttl;
                                 t->parms.iph.tos = p.iph.tos;
                                 t->parms.iph.frag_off = p.iph.frag_off;
+                                if (t->parms.link != p.link) {
+                                        t->parms.link = p.link;
+                                        ipip_tunnel_bind_dev(dev);
+                                        netdev_state_change(dev);
+                                }
                         }
                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
                                 err = -EFAULT;
@@ -791,12 +830,9 @@ static void ipip_tunnel_setup(struct net_device *dev)
 
 static int ipip_tunnel_init(struct net_device *dev)
 {
-        struct net_device *tdev = NULL;
         struct ip_tunnel *tunnel;
-        struct iphdr *iph;
 
         tunnel = netdev_priv(dev);
-        iph = &tunnel->parms.iph;
 
         tunnel->dev = dev;
         strcpy(tunnel->parms.name, dev->name);
@@ -804,29 +840,7 @@ static int ipip_tunnel_init(struct net_device *dev)
         memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
         memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
 
-        if (iph->daddr) {
-                struct flowi fl = { .oif = tunnel->parms.link,
-                                    .nl_u = { .ip4_u =
-                                              { .daddr = iph->daddr,
-                                                .saddr = iph->saddr,
-                                                .tos = RT_TOS(iph->tos) } },
-                                    .proto = IPPROTO_IPIP };
-                struct rtable *rt;
-                if (!ip_route_output_key(&rt, &fl)) {
-                        tdev = rt->u.dst.dev;
-                        ip_rt_put(rt);
-                }
-                dev->flags |= IFF_POINTOPOINT;
-        }
-
-        if (!tdev && tunnel->parms.link)
-                tdev = __dev_get_by_index(&init_net, tunnel->parms.link);
-
-        if (tdev) {
-                dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
-                dev->mtu = tdev->mtu - sizeof(struct iphdr);
-        }
-        dev->iflink = tunnel->parms.link;
+        ipip_tunnel_bind_dev(dev);
 
         return 0;
 }