From: patchwork-bot+netdevbpf@kernel.org
To: Yizhou Zhao <zhaoyz24@mails.tsinghua.edu.cn>
Cc: netdev@vger.kernel.org, horms@verge.net.au, ja@ssi.bg,
pablo@netfilter.org, fw@strlen.de, phil@nwl.cc,
davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com, lvs-devel@vger.kernel.org,
netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
yangyx22@mails.tsinghua.edu.cn, wangao@seu.edu.cn,
fengxw06@126.com, qli01@tsinghua.edu.cn, xuke@tsinghua.edu.cn
Subject: Re: [PATCH net v2] ipvs: fix PMTU for GUE/GRE tunnel ICMP errors
Date: Mon, 06 Jul 2026 10:50:21 +0000 [thread overview]
Message-ID: <178333502188.500093.18161993584904393152.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20260702073430.67680-1-zhaoyz24@mails.tsinghua.edu.cn>
Hello:
This patch was applied to netdev/net.git (main)
by Florian Westphal <fw@strlen.de>:
On Thu, 2 Jul 2026 15:34:28 +0800 you wrote:
> When an ICMP Fragmentation Needed error is received for a tunneled IPVS
> connection, ip_vs_in_icmp() recomputes the MTU that the original packet
> can use by subtracting the tunnel overhead from the reported next-hop
> MTU.
>
> The current code always subtracts sizeof(struct iphdr), which is only
> the IPIP overhead. For GUE and GRE tunnels, ipvs_udp_decap() and
> ipvs_gre_decap() already compute the additional tunnel header length,
> but that value is scoped to the decapsulation block and is lost before
> the ICMP_FRAG_NEEDED handling. As a result, the ICMP error sent back to
> the client advertises an MTU that is too large, so PMTUD can fail to
> converge for GUE/GRE-tunneled real servers.
>
> [...]
Here is the summary with links:
- [net,v2] ipvs: fix PMTU for GUE/GRE tunnel ICMP errors
https://git.kernel.org/netdev/net/c/6b335af0d0d1
You are awesome, thank you!
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prev parent reply other threads:[~2026-07-06 10:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-02 7:34 [PATCH net v2] ipvs: fix PMTU for GUE/GRE tunnel ICMP errors Yizhou Zhao
2026-07-02 11:31 ` Julian Anastasov
2026-07-04 10:03 ` Julian Anastasov
2026-07-06 10:50 ` patchwork-bot+netdevbpf [this message]
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