netinet6: In tcp_lro_rx_ipv6(), check for IPv6 flow ID.
Submitted by: Neel Chauhan <neel AT neelc DOT org>
neel_neelc.org on May 31 2020, 7:58 PM.Authored by
In RFC 6437 there is no rule, that flow labels are immutable for a given TCP session. It only notes in section 6.1, that changing the flow label within a TCP stream might be suspicious.
Given, that LRO handling is on the recipient end of the session -- there are no routing, forwarding or QoS behind this point -- the flow label is irrelevant by definition.
If I'm wrong, the change can be passed.