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l2tp: fix userspace reception on plain L2TP sockets

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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>
This commit is contained in:
Guillaume Nault 2014-03-06 11:15:10 +01:00 committed by David S. Miller
parent bb5016eac1
commit 9e9cb6221a
1 changed files with 7 additions and 5 deletions
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12
net/l2tp/l2tp_ppp.c
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@ -254,12 +254,14 @@ static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int
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;