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313a71ee7b
While the default iptables setup used by Fedora/RHEL distros only restricts traffic on the INPUT and/or FORWARD rules, some users might have custom firewalls that restrict the OUTPUT rules too. These can prevent DHCP/DNS/TFTP responses from dnsmasq from reaching the guest VMs. We should thus whitelist these protocols in the OUTPUT chain, as well as the INPUT chain. Signed-off-by: Malina Salina <malina.salina@protonmail.com> Initial patch then modified to add unit tests and IPv6 support Reviewed-by: Michal Privoznik <mprivozn@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
129 lines
2.4 KiB
Plaintext
129 lines
2.4 KiB
Plaintext
iptables \
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--table filter \
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--insert LIBVIRT_INP \
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--in-interface virbr0 \
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--protocol tcp \
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--destination-port 67 \
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--jump ACCEPT
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iptables \
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--table filter \
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--insert LIBVIRT_INP \
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--in-interface virbr0 \
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--protocol udp \
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--destination-port 67 \
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--jump ACCEPT
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iptables \
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--table filter \
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--insert LIBVIRT_OUT \
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--out-interface virbr0 \
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--protocol tcp \
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--destination-port 68 \
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--jump ACCEPT
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iptables \
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--table filter \
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--insert LIBVIRT_OUT \
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--out-interface virbr0 \
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--protocol udp \
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--destination-port 68 \
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--jump ACCEPT
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iptables \
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--table filter \
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--insert LIBVIRT_INP \
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--in-interface virbr0 \
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--protocol tcp \
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--destination-port 53 \
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--jump ACCEPT
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iptables \
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--table filter \
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--insert LIBVIRT_INP \
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--in-interface virbr0 \
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--protocol udp \
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--destination-port 53 \
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--jump ACCEPT
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iptables \
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--table filter \
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--insert LIBVIRT_OUT \
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--out-interface virbr0 \
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--protocol tcp \
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--destination-port 53 \
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--jump ACCEPT
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iptables \
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--table filter \
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--insert LIBVIRT_OUT \
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--out-interface virbr0 \
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--protocol udp \
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--destination-port 53 \
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--jump ACCEPT
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iptables \
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--table filter \
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--insert LIBVIRT_FWO \
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--in-interface virbr0 \
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--jump REJECT
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iptables \
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--table filter \
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--insert LIBVIRT_FWI \
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--out-interface virbr0 \
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--jump REJECT
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iptables \
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--table filter \
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--insert LIBVIRT_FWX \
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--in-interface virbr0 \
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--out-interface virbr0 \
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--jump ACCEPT
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iptables \
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--table filter \
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--insert LIBVIRT_FWO \
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--source 192.168.122.0/24 \
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--in-interface virbr0 \
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--jump ACCEPT
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iptables \
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--table filter \
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--insert LIBVIRT_FWI \
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--destination 192.168.122.0/24 \
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--out-interface virbr0 \
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--match conntrack \
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--ctstate ESTABLISHED,RELATED \
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--jump ACCEPT
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iptables \
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--table nat \
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--insert LIBVIRT_PRT \
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--source 192.168.122.0/24 '!' \
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--destination 192.168.122.0/24 \
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--jump MASQUERADE
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iptables \
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--table nat \
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--insert LIBVIRT_PRT \
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--source 192.168.122.0/24 \
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-p udp '!' \
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--destination 192.168.122.0/24 \
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--jump MASQUERADE \
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--to-ports 1024-65535
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iptables \
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--table nat \
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--insert LIBVIRT_PRT \
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--source 192.168.122.0/24 \
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-p tcp '!' \
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--destination 192.168.122.0/24 \
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--jump MASQUERADE \
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--to-ports 1024-65535
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iptables \
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--table nat \
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--insert LIBVIRT_PRT \
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--source 192.168.122.0/24 \
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--destination 255.255.255.255/32 \
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--jump RETURN
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iptables \
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--table nat \
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--insert LIBVIRT_PRT \
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--source 192.168.122.0/24 \
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--destination 224.0.0.0/24 \
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--jump RETURN
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iptables \
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--table mangle \
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--insert LIBVIRT_PRT \
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--out-interface virbr0 \
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--protocol udp \
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--destination-port 68 \
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--jump CHECKSUM \
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--checksum-fill
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