[PATCH 6.1 061/236] net l2tp: drop flow hash on forward

Greg Kroah-Hartman
2024-05-14T11:30:14Z

From: David Bauer <mail@david-bauer.net>

[ Upstream commit 42f853b42899d9b445763b55c3c8adc72be0f0e1 ]

Drop the flow-hash of the skb when forwarding to the L2TP netdev.

This avoids the L2TP qdisc from using the flow-hash from the outer
packet, which is identical for every flow within the tunnel.

This does not affect every platform but is specific for the ethernet
driver. It depends on the platform including L4 information in the
flow-hash.

One such example is the Mediatek Filogic MT798x family of networking
processors.

Fixes: d9e31d17ceba ("l2tp: Add L2TP ethernet pseudowire support")
Acked-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David Bauer <mail@david-bauer.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240424171110.13701-1-mail@david-bauer.net
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/l2tp/l2tp_eth.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
index f2ae03c404736..1f41d2f3b8c4e 100644
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -136,6 +136,9 @@ static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb,
/* checksums verified by L2TP */
skb->ip_summed = CHECKSUM_NONE;

+ /* drop outer flow-hash */
+ skb_clear_hash(skb);
+
skb_dst_drop(skb);
nf_reset_ct(skb);

--
2.43.0