[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>

diff --git a/net/llc/llc_input.c b/net/llc/llc_input.c
index cb9f7f058f759e5039b4357fabc441b80d6a1a4e..32cf8ac8ea80f99269d538cb6c382ba75319d162 100644 (file)
--- 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]))