I am curious as to what the correct behavior here should be for encapsulated (6in4, 6to4, teredo) packets, and if this functionality was also borked. I was under the impression that for encapsulated packets the tos field was copied from the encapsulated packet to the ipv4 header.
I will make a note of this in the uberwrt/cerowrt/bismark efforts going on and backport the upcoming patch to openwrt.
FYI
IPV6 ECN support is buggy on current linux kernels
Fix is on the way, problem spotted by Steinar H. Gunderson
https://bugzilla.kernel.org/show_bug.cgi?id=34322
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