[IP_GRE]: Rebinding of GRE tunnels to other interfaces

This is similar to the change already done for IPIP tunnels.

Once created, a GRE tunnel can't be bound to another device.
To reproduce:

# create a tunnel:
ip tunnel add tunneltest0 mode gre remote 10.0.0.1 dev eth0
# try to change the bounding device from eth0 to eth1:
ip tunnel change tunneltest0 dev eth1
# show the result:
ip tunnel show tunneltest0

tunneltest0: gre/ip  remote 10.0.0.1  local any  dev eth0  ttl inherit

Notice the bound device has not changed from eth0 to eth1.

This patch fixes it. When changing the binding, it also recalculates the
MTU according to the new bound device's MTU.

Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 60 insertions, 42 deletions

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 4b93f32de10d..0832f6e028b8 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -896,6 +896,59 @@ tx_error:
         return 0;
 }
 
+static void ipgre_tunnel_bind_dev(struct net_device *dev)
+{
+        struct net_device *tdev = NULL;
+        struct ip_tunnel *tunnel;
+        struct iphdr *iph;
+        int hlen = LL_MAX_HEADER;
+        int mtu = ETH_DATA_LEN;
+        int addend = sizeof(struct iphdr) + 4;
+
+        tunnel = netdev_priv(dev);
+        iph = &tunnel->parms.iph;
+
+        /* Guess output device to choose reasonable mtu and hard_header_len */
+
+        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_GRE };
+                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) {
+                hlen = tdev->hard_header_len;
+                mtu = tdev->mtu;
+        }
+        dev->iflink = tunnel->parms.link;
+
+        /* Precalculate GRE options length */
+        if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
+                if (tunnel->parms.o_flags&GRE_CSUM)
+                        addend += 4;
+                if (tunnel->parms.o_flags&GRE_KEY)
+                        addend += 4;
+                if (tunnel->parms.o_flags&GRE_SEQ)
+                        addend += 4;
+        }
+        dev->hard_header_len = hlen + addend;
+        dev->mtu = mtu - addend;
+        tunnel->hlen = addend;
+
+}
+
 static int
 ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 {
@@ -983,6 +1036,11 @@ ipgre_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;
+                                        ipgre_tunnel_bind_dev(dev);
+                                        netdev_state_change(dev);
+                                }
                         }
                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
                                 err = -EFAULT;
@@ -1162,12 +1220,8 @@ static void ipgre_tunnel_setup(struct net_device *dev)
 
 static int ipgre_tunnel_init(struct net_device *dev)
 {
-        struct net_device *tdev = NULL;
         struct ip_tunnel *tunnel;
         struct iphdr *iph;
-        int hlen = LL_MAX_HEADER;
-        int mtu = ETH_DATA_LEN;
-        int addend = sizeof(struct iphdr) + 4;
 
         tunnel = netdev_priv(dev);
         iph = &tunnel->parms.iph;
@@ -1178,23 +1232,9 @@ static int ipgre_tunnel_init(struct net_device *dev)
         memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
         memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
 
-        /* Guess output device to choose reasonable mtu and hard_header_len */
+        ipgre_tunnel_bind_dev(dev);
 
         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_GRE };
-                struct rtable *rt;
-                if (!ip_route_output_key(&rt, &fl)) {
-                        tdev = rt->u.dst.dev;
-                        ip_rt_put(rt);
-                }
-
-                dev->flags |= IFF_POINTOPOINT;
-
 #ifdef CONFIG_NET_IPGRE_BROADCAST
                 if (MULTICAST(iph->daddr)) {
                         if (!iph->saddr)
@@ -1205,31 +1245,9 @@ static int ipgre_tunnel_init(struct net_device *dev)
                         dev->stop = ipgre_close;
                 }
 #endif
-        } else {
+        } else
                 dev->header_ops = &ipgre_header_ops;
-        }
-
-        if (!tdev && tunnel->parms.link)
-                tdev = __dev_get_by_index(&init_net, tunnel->parms.link);
-
-        if (tdev) {
-                hlen = tdev->hard_header_len;
-                mtu = tdev->mtu;
-        }
-        dev->iflink = tunnel->parms.link;
 
-        /* Precalculate GRE options length */
-        if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
-                if (tunnel->parms.o_flags&GRE_CSUM)
-                        addend += 4;
-                if (tunnel->parms.o_flags&GRE_KEY)
-                        addend += 4;
-                if (tunnel->parms.o_flags&GRE_SEQ)
-                        addend += 4;
-        }
-        dev->hard_header_len = hlen + addend;
-        dev->mtu = mtu - addend;
-        tunnel->hlen = addend;
         return 0;
 }