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Date:	Fri,  8 Aug 2014 13:39:17 -0700
From:	Kamal Mostafa <>
Cc:	Phil Turnbull <>,
	Vegard Nossum <>,
	Willy Tarreau <>,
	Linus Torvalds <>,
	Kamal Mostafa <>
Subject: [PATCH 3.13 134/259] net/l2tp: don't fall back on UDP [get|set]sockopt -stable review patch.  If anyone has any objections, please let me know.


From: Sasha Levin <>

commit 3cf521f7dc87c031617fd47e4b7aa2593c2f3daf upstream.

The l2tp [get|set]sockopt() code has fallen back to the UDP functions
for socket option levels != SOL_PPPOL2TP since day one, but that has
never actually worked, since the l2tp socket isn't an inet socket.

As David Miller points out:

  "If we wanted this to work, it'd have to look up the tunnel and then
   use tunnel->sk, but I wonder how useful that would be"

Since this can never have worked so nobody could possibly have depended
on that functionality, just remove the broken code and return -EINVAL.

Reported-by: Sasha Levin <>
Acked-by: James Chapman <>
Acked-by: David Miller <>
Cc: Phil Turnbull <>
Cc: Vegard Nossum <>
Cc: Willy Tarreau <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Kamal Mostafa <>
 net/l2tp/l2tp_ppp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index 8580b78..cfa1406 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -1365,7 +1365,7 @@ static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
 	int err;
 	if (level != SOL_PPPOL2TP)
-		return udp_prot.setsockopt(sk, level, optname, optval, optlen);
+		return -EINVAL;
 	if (optlen < sizeof(int))
 		return -EINVAL;
@@ -1491,7 +1491,7 @@ static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
 	struct pppol2tp_session *ps;
 	if (level != SOL_PPPOL2TP)
-		return udp_prot.getsockopt(sk, level, optname, optval, optlen);
+		return -EINVAL;
 	if (get_user(len, optlen))
 		return -EFAULT;

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