netfilter: nf_tables: add support for inverted logic in nft_lookup

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Introduce a new configuration option for this expression, which allows users
to invert the logic of set lookups.

In _init() we will now return EINVAL if NFT_LOOKUP_F_INV is in anyway
related to a map lookup.

The code in the _eval() function has been untangled and updated to sopport the
XOR of options, as we should consider 4 cases:
 * lookup false, invert false -> NFT_BREAK
 * lookup false, invert true -> return w/o NFT_BREAK
 * lookup true, invert false -> return w/o NFT_BREAK
 * lookup true, invert true -> NFT_BREAK

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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Arturo Borrero 2016-06-23 12:24:08 +02:00 • committed by Pablo Neira Ayuso

parent 82bec71d46

commit 0071e184a5

2 changed files with 38 additions and 5 deletions

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include/uapi/linux/netfilter/nf_tables.h

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