caif: make zero a legal caif connetion id.

Connection ID configured through RTNL must allow zero as
connection id. If connection-id is not given when creating the
interface, configure a loopback interface using ifindex as
connection-id.

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 3 deletions

diff --git a/net/caif/chnl_net.c b/net/caif/chnl_net.c
index e866234d0e5a..20618dd3088b 100644
--- a/net/caif/chnl_net.c
+++ b/net/caif/chnl_net.c
@@ -28,6 +28,7 @@
 /* 5 sec. connect timeout */
 #define CONNECT_TIMEOUT (5 * HZ)
 #define CAIF_NET_DEFAULT_QUEUE_LEN 500
+#define UNDEF_CONNID 0xffffffff
 
 /*This list is protected by the rtnl lock. */
 static LIST_HEAD(chnl_net_list);
@@ -408,7 +409,7 @@ static void ipcaif_net_setup(struct net_device *dev)
         priv->conn_req.link_selector = CAIF_LINK_HIGH_BANDW;
         priv->conn_req.priority = CAIF_PRIO_LOW;
         /* Insert illegal value */
-        priv->conn_req.sockaddr.u.dgm.connection_id = 0;
+        priv->conn_req.sockaddr.u.dgm.connection_id = UNDEF_CONNID;
         priv->flowenabled = false;
 
         init_waitqueue_head(&priv->netmgmt_wq);
@@ -471,9 +472,11 @@ static int ipcaif_newlink(struct net *src_net, struct net_device *dev,
         else
                 list_add(&caifdev->list_field, &chnl_net_list);
 
-        /* Take ifindex as connection-id if null */
-        if (caifdev->conn_req.sockaddr.u.dgm.connection_id == 0)
+        /* Use ifindex as connection id, and use loopback channel default. */
+        if (caifdev->conn_req.sockaddr.u.dgm.connection_id == UNDEF_CONNID) {
                 caifdev->conn_req.sockaddr.u.dgm.connection_id = dev->ifindex;
+                caifdev->conn_req.protocol = CAIFPROTO_DATAGRAM_LOOP;
+        }
         return ret;
 }