Phonet: error on broadcast sending (unimplemented)

If we ever implement this, then we can stop returning an error.

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/phonet.h b/include/linux/phonet.h
index 1ef5a0781831..e5126cff9b2a 100644
--- a/include/linux/phonet.h
+++ b/include/linux/phonet.h
@@ -38,6 +38,7 @@
 #define PNPIPE_IFINDEX          2
 
 #define PNADDR_ANY              0
+#define PNADDR_BROADCAST        0xFC
 #define PNPORT_RESOURCE_ROUTING 0
 
 /* Values for PNPIPE_ENCAP option */
diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c
index a662e62a99cf..f60c0c2aacba 100644
--- a/net/phonet/af_phonet.c
+++ b/net/phonet/af_phonet.c
@@ -168,6 +168,12 @@ static int pn_send(struct sk_buff *skb, struct net_device *dev,
                 goto drop;
         }
 
+        /* Broadcast sending is not implemented */
+        if (pn_addr(dst) == PNADDR_BROADCAST) {
+                err = -EOPNOTSUPP;
+                goto drop;
+        }
+
         skb_reset_transport_header(skb);
         WARN_ON(skb_headroom(skb) & 1); /* HW assumes word alignment */
         skb_push(skb, sizeof(struct phonethdr));