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088bb1e12e
From the upstream repo:
Instead of assuming only one register is used, track all 16 regs
individually.
This avoids need for the 'PREV_PAYLOAD' hack and also avoids the need to
clear out old flags:
When we see that register 'x' will be written to, that register state is
reset automatically.
Existing dissector decodes
ip saddr 1.2.3.4 meta l4proto tcp
... as
-s 6.0.0.0 -p tcp
iptables-nft -s 1.2.3.4 -p tcp is decoded correctly because the expressions
are ordered like:
meta l4proto tcp ip saddr 1.2.3.4
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... and 'meta l4proto' did clear the PAYLOAD flag.
The simpler fix is:
ctx->flags &= ~NFT_XT_CTX_PAYLOAD;
in nft_parse_cmp(), but that breaks dissection of '1-42', because
the second compare ('cmp lte 42') will not find the
payload expression anymore.
This commit fixes #11169 and openwrt/packages#22727, and potentially anyone that uses iptables-nft legacy support.
Signed-off-by: Rodrigo B. de Sousa Martins <rodrigo.sousa.577@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/16504
[Added patch header]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit
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