This is a note to let you know that I've just added the patch titled
udp: do not transition UDP GRO fraglist partial checksums to unnecessary
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
udp-do-not-transition-udp-gro-fraglist-partial-checksums-to-unnecessary.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f0b8c30345565344df2e33a8417a27503589247d Mon Sep 17 00:00:00 2001
From: Antoine Tenart <atenart@xxxxxxxxxx>
Date: Tue, 26 Mar 2024 12:34:00 +0100
Subject: udp: do not transition UDP GRO fraglist partial checksums to unnecessary
From: Antoine Tenart <atenart@xxxxxxxxxx>
commit f0b8c30345565344df2e33a8417a27503589247d upstream.
UDP GRO validates checksums and in udp4/6_gro_complete fraglist packets
are converted to CHECKSUM_UNNECESSARY to avoid later checks. However
this is an issue for CHECKSUM_PARTIAL packets as they can be looped in
an egress path and then their partial checksums are not fixed.
Different issues can be observed, from invalid checksum on packets to
traces like:
gen01: hw csum failure
skb len=3008 headroom=160 headlen=1376 tailroom=0
mac=(106,14) net=(120,40) trans=160
shinfo(txflags=0 nr_frags=0 gso(size=0 type=0 segs=0))
csum(0xffff232e ip_summed=2 complete_sw=0 valid=0 level=0)
hash(0x77e3d716 sw=1 l4=1) proto=0x86dd pkttype=0 iif=12
...
Fix this by only converting CHECKSUM_NONE packets to
CHECKSUM_UNNECESSARY by reusing __skb_incr_checksum_unnecessary. All
other checksum types are kept as-is, including CHECKSUM_COMPLETE as
fraglist packets being segmented back would have their skb->csum valid.
Fixes: 9fd1ff5d2ac7 ("udp: Support UDP fraglist GRO/GSO.")
Signed-off-by: Antoine Tenart <atenart@xxxxxxxxxx>
Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/udp_offload.c | 8 +-------
net/ipv6/udp_offload.c | 8 +-------
2 files changed, 2 insertions(+), 14 deletions(-)
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -685,13 +685,7 @@ INDIRECT_CALLABLE_SCOPE int udp4_gro_com
skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4);
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
- if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
- if (skb->csum_level < SKB_MAX_CSUM_LEVEL)
- skb->csum_level++;
- } else {
- skb->ip_summed = CHECKSUM_UNNECESSARY;
- skb->csum_level = 0;
- }
+ __skb_incr_checksum_unnecessary(skb);
return 0;
}
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -170,13 +170,7 @@ INDIRECT_CALLABLE_SCOPE int udp6_gro_com
skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4);
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
- if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
- if (skb->csum_level < SKB_MAX_CSUM_LEVEL)
- skb->csum_level++;
- } else {
- skb->ip_summed = CHECKSUM_UNNECESSARY;
- skb->csum_level = 0;
- }
+ __skb_incr_checksum_unnecessary(skb);
return 0;
}
Patches currently in stable-queue which might be from atenart@xxxxxxxxxx are
queue-5.15/udp-prevent-local-udp-tunnel-packets-from-being-groed.patch
queue-5.15/selftests-net-gro-fwd-update-vxlan-gro-test-expectations.patch
queue-5.15/udp-do-not-transition-udp-gro-fraglist-partial-checksums-to-unnecessary.patch
queue-5.15/udp-do-not-accept-non-tunnel-gso-skbs-landing-in-a-tunnel.patch
