[IP_TUNNEL]: Don't limit the number of tunnels with generic name explicitly.

Use the added dev_alloc_name() call to create tunnel device name,
rather than iterate in a hand-made loop with an artificial limit.

Thanks Patrick for noticing this.

[ The way this works is, when the device is actually registered,
  the generic code noticed the '%' in the name and invokes
  dev_alloc_name() to fully resolve the name.  -DaveM ]

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 10 insertions, 43 deletions

diff --git a/include/net/ip6_tunnel.h b/include/net/ip6_tunnel.h
index c17fa1fdc356..6512d85f11b3 100644
--- a/include/net/ip6_tunnel.h
+++ b/include/net/ip6_tunnel.h
@@ -14,8 +14,6 @@
 /* capable of receiving packets */
 #define IP6_TNL_F_CAP_RCV 0x20000
 
-#define IP6_TNL_MAX 128
-
 /* IPv6 tunnel */
 
 struct ip6_tnl {
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 63f691719353..906cb1ada4c3 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -259,16 +259,8 @@ static struct ip_tunnel * ipgre_tunnel_locate(struct ip_tunnel_parm *parms, int
 
         if (parms->name[0])
                 strlcpy(name, parms->name, IFNAMSIZ);
-        else {
-                int i;
-                for (i=1; i<100; i++) {
-                        sprintf(name, "gre%d", i);
-                        if (__dev_get_by_name(&init_net, name) == NULL)
-                                break;
-                }
-                if (i==100)
-                        goto failed;
-        }
+        else
+                sprintf(name, "gre%%d");
 
         dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup);
         if (!dev)
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index da281581692c..e77e3b855834 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -221,16 +221,8 @@ static struct ip_tunnel * ipip_tunnel_locate(struct ip_tunnel_parm *parms, int c
 
         if (parms->name[0])
                 strlcpy(name, parms->name, IFNAMSIZ);
-        else {
-                int i;
-                for (i=1; i<100; i++) {
-                        sprintf(name, "tunl%d", i);
-                        if (__dev_get_by_name(&init_net, name) == NULL)
-                                break;
-                }
-                if (i==100)
-                        goto failed;
-        }
+        else
+                sprintf(name, "tunl%%d");
 
         dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup);
         if (dev == NULL)
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index cd940647bd12..2a124e9a1b2d 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -229,18 +229,11 @@ static struct ip6_tnl *ip6_tnl_create(struct ip6_tnl_parm *p)
         char name[IFNAMSIZ];
         int err;
 
-        if (p->name[0]) {
+        if (p->name[0])
                 strlcpy(name, p->name, IFNAMSIZ);
-        } else {
-                int i;
-                for (i = 1; i < IP6_TNL_MAX; i++) {
-                        sprintf(name, "ip6tnl%d", i);
-                        if (__dev_get_by_name(&init_net, name) == NULL)
-                                break;
-                }
-                if (i == IP6_TNL_MAX)
-                        goto failed;
-        }
+        else
+                sprintf(name, "ip6tnl%%d");
+
         dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
         if (dev == NULL)
                 goto failed;
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index e77239d02bf5..dde7801abeff 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -164,16 +164,8 @@ static struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int
 
         if (parms->name[0])
                 strlcpy(name, parms->name, IFNAMSIZ);
-        else {
-                int i;
-                for (i=1; i<100; i++) {
-                        sprintf(name, "sit%d", i);
-                        if (__dev_get_by_name(&init_net, name) == NULL)
-                                break;
-                }
-                if (i==100)
-                        goto failed;
-        }
+        else
+                sprintf(name, "sit%%d");
 
         dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
         if (dev == NULL)