From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Ismael Luceno <iluceno@suse.de>
Cc: linux-kernel@vger.kernel.org, "Firo Yang" <firo.yang@suse.com>,
"Andreas Taschner" <andreas.taschner@suse.com>,
"Michal Kubeček" <mkubecek@suse.com>,
"Simon Horman" <horms@verge.net.au>,
"Julian Anastasov" <ja@ssi.bg>,
lvs-devel@vger.kernel.org, netfilter-devel@vger.kernel.org,
netdev@vger.kernel.org, coreteam@netfilter.org
Subject: Re: [PATCH v2] ipvs: Fix checksumming on GSO of SCTP packets
Date: Thu, 25 Apr 2024 00:21:26 +0200 [thread overview]
Message-ID: <ZimF5pntTWWcwq-r@calendula> (raw)
In-Reply-To: <20240421142234.15764-1-iluceno@suse.de>
On Sun, Apr 21, 2024 at 04:22:32PM +0200, Ismael Luceno wrote:
> 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.
I am placing this into the nf.git tree for submission upstream in the
next pull request, unless stated otherwise.
Thanks.
> Fixes: 90017accff61 ("sctp: Add GSO support", 2016-06-02)
> 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>
> CC: Michal Kubeček <mkubecek@suse.com>
> CC: Simon Horman <horms@verge.net.au>
> CC: Julian Anastasov <ja@ssi.bg>
> CC: lvs-devel@vger.kernel.org
> CC: netfilter-devel@vger.kernel.org
> CC: netdev@vger.kernel.org
> CC: coreteam@netfilter.org
> ---
>
> Notes:
> Changes since v1:
> * Added skb_is_gso before skb_is_gso_sctp.
> * Added "Fixes" tag.
>
> net/netfilter/ipvs/ip_vs_proto_sctp.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c
> index a0921adc31a9..1e689c714127 100644
> --- a/net/netfilter/ipvs/ip_vs_proto_sctp.c
> +++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c
> @@ -126,7 +126,8 @@ 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;
> }
> @@ -174,7 +175,8 @@ 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;
> }
> --
> 2.43.0
>
>
prev parent reply other threads:[~2024-04-24 22:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-21 14:22 [PATCH v2] ipvs: Fix checksumming on GSO of SCTP packets Ismael Luceno
2024-04-22 8:26 ` Julian Anastasov
2024-04-24 22:21 ` Pablo Neira Ayuso [this message]
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