ipv6: Support new TSO without HBH #1329
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Currently, BIG TCP IPv6 inserts a hop-by-hop extension header with a jumbo payload option to reflect the real length of the packet bigger than 65535 bytes. New kernels will drop this extension header and just calculate the packet length from skb->len, like it's currently done for BIG TCP IPv4. Reflect the future kernel change in tcpdump and support parsing such packets. Signed-off-by: Maxim Mikityanskiy <maxim@isovalent.com>
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Cc @fxlb if you have a chance to review, that would be awesome. tl;dr: from the kernel side we plan to align big tcp ipv6 to the way big tcp ipv4 is handled today. |
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Hi @guyharris do you have a chance to take a look? Thanks so much |
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Currently, BIG TCP IPv6 inserts a hop-by-hop extension header with a jumbo payload option to reflect the real length of the packet bigger than 65535 bytes. New kernels will drop this extension header and just calculate the packet length from skb->len, like it's currently done for BIG TCP IPv4.
Reflect the future kernel change in tcpdump and support parsing such packets.
Kernel ref: https://lore.kernel.org/netdev/20250617144017.82931-1-maxim@isovalent.com/