[LLC]: allow applications to get copy of kernel datagrams

It is legal for an application to bind to a SAP that is also being
used by the kernel. This happens if the bridge module binds to the
STP SAP, and the user wants to have a daemon for STP as well.
It is possible to have kernel doing STP on one bridge, but
let application do RSTP on another bridge.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/llc/llc_input.c b/net/llc/llc_input.c
index cb9f7f058f75..32cf8ac8ea80 100644
--- a/net/llc/llc_input.c
+++ b/net/llc/llc_input.c
@@ -173,8 +173,10 @@ int llc_rcv(struct sk_buff *skb, struct net_device *dev,
          */
         rcv = rcu_dereference(sap->rcv_func);
         if (rcv) {
+                struct sk_buff *cskb = skb_clone(skb, GFP_ATOMIC);
+                if (cskb)
+                        rcv(cskb, dev, pt, orig_dev);
                 rcv(skb, dev, pt, orig_dev);
-                goto out_put;
         }
         dest = llc_pdu_type(skb);
         if (unlikely(!dest || !llc_type_handlers[dest - 1]))