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Add vmod_h2 to control http rapid reset rate limits per session#3999
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Agreed on irc. Will merge after issues with previous commits have been addressed in the interest of future bisects. |
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This will allow per-session adjustments and also significantly lower the risk of inconsistent calculations in the rate limit code during parameter changes. Ref varnishcache#3996
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This was referenced Oct 18, 2023
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(edit: reduced to just two commits now that #3997 has been merged)
During bugwash on 2023-10-16, I suggested to support overrides of the rate limits from VCL, because nowadays many environments can provide friend/foe metrics like "has a valid session" or "has passed a Turing test".
Using tight rate limits is important to keep adversaries in check, but for (likely) known good clients, one might want to lift limits.
This patch adds such per-session controls in the form of vmod
h2.The implementation via a custom vmod was preferred during bugwash over adding session variables like
sess.h2_rapid_resetbecause they are transport specific. During the last VDD, we also agreed to move protocols into extensions with additional controls provided by vmods. This patch is a first step in this direction.Ref #3996