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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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Its possible that we cannot find the template without also
considering an implicit mask. For this we need to store the offset.
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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If we try to add a rule like:
nft add rule filter input udp length {55-9999}
nftable shows:
BUG: invalid byte order conversion 0 => 2
nft: src/evaluate.c:153: byteorder_conversion_op: Assertion `0' failed.
Some of the existing payload fields rely on BYTEORDER_INVALID. Therefore, if we
try to convert it in evaluation step, we hit this bug.
This patch allows to add a specific byteorder to the struct proto_hdr_template. If
we create a expression with a invalid byteorder, we will use the byteorder
added to the proto_hdr_template structure.
Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Singed-off-by: Patrick McHardy <kaber@trash.net>
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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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Add size and type information to non-basetype types and remove the now
redundant information from the symbol tables.
This will be used to determine size and byteorder of set members without
analyzing the ruleset for incremental update operations.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Add a table containing all available datatypes and registration/lookup functions.
This will be used to associate a stand-alone set in the kernel with the correct
type without parsing the entire ruleset.
Additionally it would now be possible to remove the global declarations for the
core types. Not done yet though.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Signed-off-by: Patrick McHardy <kaber@trash.net>
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