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Does Linux TCP stack processing happen before or after netfilter?

Okay, I found this video from Devconf 2018 with Jiri Benc talking about Linux network pipeline. TCP is a transport layer protocol; for packets that use it, the network stack must first parse the ...
William's user avatar
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Matching DSCP portion of ToS or traffic class byte using ebtables

Answering my own question, it doesn't seem that this is possible with ebtables (thank you for the comment @A.B), as there's no mask or specific keyword for dscp. Trying this in a legacy project that ...
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Does Linux TCP stack processing happen before or after netfilter?

Even without perusing the source code it's fairly easy to test. On a machine running with a firewall ruleset permitting certain ports only from e.g. one specific IP stand up a tcpdump for the port in ...
tink's user avatar
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