[IPIP]: Allow rebinding the tunnel to another interface

[net-next-2.6.git] / net / ipv4 / ipip.c

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 8c2b2b0741daeb4ac118ea39721ecaab19ad00fb..160535b5170549e77e12d8e2c3ccb5737f67e01a 100644 (file)
--- 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;
 }