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This patch adds support for the DHCPv6 helper.
1) nfct helper add dhcpv6 inet6 udp
2) ip6tables -I OUTPUT -t raw -p udp --sport 546 -j CT --helper dhcpv6
3) run conntrackd
You should see:
% conntrack -L exp -f ipv6
279 proto=17 src=:: dst=ff02::1:2 sport=0 dport=546 mask-src=:: mask-dst=ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff sport=0 dport=65535 master-src=fe80::221:ccff:fe4a:7f9c master-dst=ff02::1:2 sport=546 dport=547 PERMANENT class=0 helper=dhcpv6
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds the QueueLen option, that allows you to increase
the maximum number of packets waiting in the nfnetlink_queue to
receive a verdict from userspace.
Rising the default value (1024) is useful to avoid hitting the following
error message: "nf_queue: full at X entries, dropping packets(s)".
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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How to use this helper in a few steps:
1) You can enable this helper via:
nfct helper add rpc inet tcp
nfct helper add rpc inet udp
2) Configure /etc/conntrackd/conntrackd.conf and launch it.
3) You can test this helper locally with the following rule-set:
iptables -A OUTPUT -t raw -p udp -m udp --dport 111 -j CT --helper rpc
iptables -A OUTPUT -t raw -p tcp -m tcp --dport 111 -j CT --helper rpc
iptables -A OUTPUT -p tcp -m state --state NEW,ESTABLISHED -m tcp --dport 111 -j ACCEPT
iptables -A OUTPUT -p udp -m state --state NEW,ESTABLISHED -m udp --dport 111 -j ACCEPT
iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -P OUTPUT DROP
4) Configure NFS and export some local directory. Then, mount it with version 3.
mount.nfs -onfsvers=3 127.0.0.1:/srv/cvs /mnt/
You should see permanent expectations created for this.
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds the user-space helper infrastructure. It also
contains the implementation of the FTP helper in user-space.
There's one example file that you can use to configure conntrackd
as user-space connection tracking helper under:
doc/helper/conntrackd.conf
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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