path: root/extensions/
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authorPhil Sutter <>2021-09-21 16:42:36 +0200
committerPhil Sutter <>2021-09-27 13:29:38 +0200
commitf9b33967f2b4b58160c0a970da77d5e44406803a (patch)
tree193643d0af4bdab4503430dbeb74ec0e7642beec /extensions/
parent4318961230bce82958df82b57f1796143bf2f421 (diff)
nft: Check base-chain compatibility when adding to cache
With introduction of dedicated base-chain slots, a selection process was established as no longer all base-chains ended in the same chain list for later searching/checking but only the first one found for each hook matching criteria is kept and the rest discarded. A side-effect of the above is that table compatibility checking started to omit consecutive base-chains, making iptables-nft less restrictive as long as the expected base-chains were returned first from kernel when populating the cache. Make behaviour consistent and warn users about the possibly disturbing chains found by: * Run all base-chain checks from nft_is_chain_compatible() before allowing a base-chain to occupy its slot. * If an unfit base-chain was found (and discarded), flag the table's cache as tainted and warn about it if the remaining ruleset is otherwise compatible. Since base-chains that remain in cache would pass nft_is_chain_compatible() checking, remove that and reduce it to rule inspection. Signed-off-by: Phil Sutter <>
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