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generic l2tp: drop flow hash on forward

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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.

Signed-off-by: David Bauer <mail@david-bauer.net>
This commit is contained in:
David Bauer 2024-02-26 14:43:09 +01:00
parent 0985262fd0
commit 35a5e62da7
2 changed files with 62 additions and 0 deletions
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31
target/linux/generic/pending-5.15/778-net-l2tp-drop-flow-hash-on-forward.patch Normal file
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@ -0,0 +1,31 @@
From 4a44a52f16ccd3d03e0cb5fb437a5eb31a5f9f05 Mon Sep 17 00:00:00 2001
From: David Bauer <mail@david-bauer.net>
Date: Mon, 26 Feb 2024 21:39:34 +0100
Subject: [PATCH] net l2tp: drop flow hash on forward
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.
Signed-off-by: David Bauer <mail@david-bauer.net>
---
net/l2tp/l2tp_eth.c | 3 +++
1 file changed, 3 insertions(+)
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -136,6 +136,9 @@ static void l2tp_eth_dev_recv(struct l2t
/* 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);

31
target/linux/generic/pending-6.1/778-net-l2tp-drop-flow-hash-on-forward.patch Normal file
View File

@ -0,0 +1,31 @@
From 4a44a52f16ccd3d03e0cb5fb437a5eb31a5f9f05 Mon Sep 17 00:00:00 2001
From: David Bauer <mail@david-bauer.net>
Date: Mon, 26 Feb 2024 21:39:34 +0100
Subject: [PATCH] net l2tp: drop flow hash on forward
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.
Signed-off-by: David Bauer <mail@david-bauer.net>
---
net/l2tp/l2tp_eth.c | 3 +++
1 file changed, 3 insertions(+)
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -136,6 +136,9 @@ static void l2tp_eth_dev_recv(struct l2t
/* 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);