backport 0.3.x - fix: limit number of CONTINUATION frames allowed #759
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Noah-Kennedy
approved these changes
Apr 3, 2024
Calculate the amount of allowed CONTINUATION frames based on other
settings.
max_header_list_size / max_frame_size
That is about how many CONTINUATION frames would be needed to send
headers up to the max allowed size. We then multiply by that by a small
amount, to allow for implementations that don't perfectly pack into the
minimum frames *needed*.
In practice, *much* more than that would be a very inefficient peer, or
a peer trying to waste resources.
See https://seanmonstar.com/blog/hyper-http2-continuation-flood/ for
more info.
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Calculate the amount of allowed CONTINUATION frames based on other settings.
That is about how many CONTINUATION frames would be needed to send headers up to the max allowed size. We then multiply by that by a small amount, to allow for implementations that don't perfectly pack into the minimum frames needed.
In practice, much more than that would be a very inefficient peer, or a peer trying to waste resources.
See https://seanmonstar.com/blog/hyper-http2-continuation-flood/ for more info.