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This enables nft to display
frag frag-off 33
... by considering a mask during binop postprocess in case
the initial template lookup done when the exthdr expression was
created did not yield a match.
In the above example, kernel netlink data specifies 16bits,
but the frag field is only 13bits wide.
We use the implicit binop mask to re-do the template lookup with
corrected offset and size information.
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Currently the context of higher layer protocols is specific to payload
expressions with some special cases for meta IIFTYPE expressions. This
approach has a few shortcomings, concretely there are more expression
types which define upper layer protocols like the ct expression and two
upcoming new types for the meta expression.
Replace the payload context by a generic protocol context to deal with
this. This patch just splits off the requires parts from the payload
expression without any functional changes, the following patches will
add further functionality for other expressions.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Signed-off-by: Patrick McHardy <kaber@trash.net>
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