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ipvs: Fix checksumming on GSO of SCTP packets

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[ Upstream commit e10d3ba4d434ed172914617ed8d74bd411421193 ]

It was observed in the wild that pairs of consecutive packets would leave
the IPVS with the same wrong checksum, and the issue only went away when
disabling GSO.

IPVS needs to avoid computing the SCTP checksum when using GSO.

Fixes: 90017accff61 ("sctp: Add GSO support")
Co-developed-by: Firo Yang <firo.yang@suse.com>
Signed-off-by: Ismael Luceno <iluceno@suse.de>
Tested-by: Andreas Taschner <andreas.taschner@suse.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ismael Luceno 2024-04-21 16:22:32 +02:00 committed by Greg Kroah-Hartman
parent 07b20d0a3d
commit 740a06078a
1 changed files with 4 additions and 2 deletions
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6
net/netfilter/ipvs/ip_vs_proto_sctp.c
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@ -123,7 +123,8 @@ sctp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
if (sctph->source != cp->vport || payload_csum ||
skb->ip_summed == CHECKSUM_PARTIAL) {
sctph->source = cp->vport;
sctp_nat_csum(skb, sctph, sctphoff);
if (!skb_is_gso(skb) || !skb_is_gso_sctp(skb))
sctp_nat_csum(skb, sctph, sctphoff);
} else {
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
@ -171,7 +172,8 @@ sctp_dnat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
(skb->ip_summed == CHECKSUM_PARTIAL &&
!(skb_dst(skb)->dev->features & NETIF_F_SCTP_CRC))) {
sctph->dest = cp->dport;
sctp_nat_csum(skb, sctph, sctphoff);
if (!skb_is_gso(skb) || !skb_is_gso_sctp(skb))
sctp_nat_csum(skb, sctph, sctphoff);
} else if (skb->ip_summed != CHECKSUM_PARTIAL) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
}