l2tp: fix userspace reception on plain L2TP sockets
As pppol2tp_recv() never queues up packets to plain L2TP sockets,
pppol2tp_recvmsg() never returns data to userspace, thus making
the recv*() system calls unusable.
Instead of dropping packets when the L2TP socket isn't bound to a PPP
channel, this patch adds them to its reception queue.
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index 6bfeaa7..5990919 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -254,12 +254,14 @@
po = pppox_sk(sk);
ppp_input(&po->chan, skb);
} else {
- l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: socket not bound\n",
- session->name);
+ l2tp_dbg(session, PPPOL2TP_MSG_DATA,
+ "%s: recv %d byte data frame, passing to L2TP socket\n",
+ session->name, data_len);
- /* Not bound. Nothing we can do, so discard. */
- atomic_long_inc(&session->stats.rx_errors);
- kfree_skb(skb);
+ if (sock_queue_rcv_skb(sk, skb) < 0) {
+ atomic_long_inc(&session->stats.rx_errors);
+ kfree_skb(skb);
+ }
}
return;