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[ upstream commit aadc4ff ] When a LB node forwards packets to a backend-pod on another node, the packets are SNATed. The corresponding reverse NAT (RevNAT) is then applied to the reply packets. Checksum recaluculation is required when RevNAT. When the reply packet is an ICMP error packet, the checksum in the ICMP header must be recalculated to reflect the changes of the inner packet header. https://datatracker.ietf.org/doc/html/rfc5508#section-4.1 Since that logic was missing, it has been added in this commit. Fixes: cilium#40827 Signed-off-by: Yusho Yamaguchi <ysh.824@outlook.jp>
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pchaigno
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Jan 18, 2026
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v1.18 backports 2026-01-18
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