[Bug 1698] New: Support packet mangling from existing packet data

[bugzilla-daemon at netfilter.org]

https://bugzilla.netfilter.org/show_bug.cgi?id=1698

            Bug ID: 1698
           Summary: Support packet mangling from existing packet data
           Product: nftables
           Version: unspecified
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: nft
          Assignee: pablo at netfilter.org
          Reporter: phil at nwl.cc

A simple task is unsetting some TCP flags, syntax would look like:

| tcp flags set tcp flags & !(ecn | cwr)

Not sure if the negation actually works here, but 'tcp flags' on RHS is
rejected. Probably needs something like 5d8e33ddb1125 ("evaluate: relax
type-checking for integer arguments in mark statements"), but for payload
statements.

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