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net/sched: act_csum: don't mangle UDP tunnel GSO packets

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Similar to commit add641e7de ("sched: act_csum: don't mangle TCP and
UDP GSO packets"), UDP tunnel GSO packets going through act_csum
shouldn't have their checksum calculated at this point, because it will
be done after segmentation. Setting the checksum in act_csum modifies
skb->ip_summed and prevents inner IP csum offload from kicking in,
resulting in a packet with a bad checksum.

Add UDP tunnel GSO packets to the exceptions, and also add UDP GSO
(SKB_GSO_UDP_L4), as the same logic as in the commit mentioned above
applies to UDP GSO too.

Signed-off-by: Alice Mikityanska <alice@isovalent.com>
Reviewed-by: Davide Caratti <dcaratti@redhat.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260611192955.604661-2-alice.kernel@fastmail.im
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Alice Mikityanska 2026-06-11 21:29:45 +02:00 committed by Paolo Abeni
parent 383bad5ffe
commit 9bcb30b389
1 changed files with 6 additions and 2 deletions
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8
net/sched/act_csum.c
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@ -259,7 +259,9 @@ static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl,
const struct iphdr *iph;
u16 ul;
if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type &
(SKB_GSO_UDP | SKB_GSO_UDP_L4 |
SKB_GSO_UDP_TUNNEL | SKB_GSO_UDP_TUNNEL_CSUM))
return 1;
/*
@ -315,7 +317,9 @@ static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl,
const struct ipv6hdr *ip6h;
u16 ul;
if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type &
(SKB_GSO_UDP | SKB_GSO_UDP_L4 |
SKB_GSO_UDP_TUNNEL | SKB_GSO_UDP_TUNNEL_CSUM))
return 1;
/*