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Add translation for connlabel to nftables.
For examples:
# iptables-translate -A INPUT -m connlabel --label bit40
nft add rule ip filter INPUT ct label bit40 counter
# iptables-translate -A INPUT -m connlabel ! --label bit40 --set
nft add rule ip filter INPUT ct label set bit40 ct label and bit40 != bit40 counter
Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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When connlabel.conf is empty, nfct_labelmap_new will return NULL and
set errno to 0. So we will miss to check this situation, and cause NULL
deference in nfct_labelmap_get_bit.
Input the following commands will reproduce this crash:
# echo > /etc/xtables/connlabel.conf
# iptables -A INPUT -m connlabel --label abc
Segmentation fault (core dumped)
Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
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else, static builds will print this for every iptables invocation,
even 'iptables -L'. Delay open until we need to translate a mapping.
Reported-by: Thomas De Schampheleire <patrickdepinguin@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Pablo suggested to make it depend on lnf-conntrack, and get rid of
the example config file as well.
The problem is that the file must be in a fixed path,
/etc/xtables/connlabel.conf, else userspace needs to "guess-the-right-file"
when translating names to their bit values (and vice versa).
Originally "make install" did put an example file into /etc/xtables/,
but distributors complained about iptables ignoring the sysconfdir.
So rather remove the example file, the man-page explains the format,
and connlabels are inherently system-specific anyway.
Signed-off-by: Florian Westphal <fw@strlen.de>
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allows to "tag" connections with up to 128 label names.
Labels are defined in /etc/xtables/connlabel.conf, example:
0 from eth0
1 via eth0
Labels can then be attached to flows, e.g.
-A PREROUTING -i eth0 -m connlabel --label "from eth0" --set
Signed-off-by: Florian Westphal <fw@strlen.de>
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