FORWARD
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2023-12-01
FORWARD
FORWARD chain上主要实现安全组的功能。用户在配置缺省安全规则时候(例如允许ssh到vm,允许ping到vm),影响该chain。
#iptables --line-numbers -vnL FORWARDChain FORWARD (policy ACCEPT 0 packets, 0 bytes)num pkts bytes target prot opt in out source destination1 16203 5342K neutron-filter-top all -- * * 0.0.0.0/0 0.0.0.0/02 16203 5342K neutron-openvswi-FORWARD all -- * * 0.0.0.0/0 0.0.0.0/03 0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
同样跳转到neutron-filter-top,无规则。跳转到neutron-openvswi-FORWARD。
#iptables --line-numbers -vnL neutron-openvswi-FORWARDChain neutron-openvswi-FORWARD (1 references)num pkts bytes target prot opt in out source destination1 8170 2630K neutron-openvswi-sg-chain all -- * * 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-out tap583c7038-d3 --physdev-is-bridged2 8156 2729K neutron-openvswi-sg-chain all -- * * 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-in tap583c7038-d3 --physdev-is-bridged
neutron-openvswi-FORWARD将匹配所有进出tap-XXX端口的流量。
#iptables --line-numbers -vnL neutron-openvswi-sg-chainChain neutron-openvswi-sg-chain (2 references)num pkts bytes target prot opt in out source destination1 8170 2630K neutron-openvswi-i583c7038-d all -- * * 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-out tap583c7038-d3 --physdev-is-bridged2 8156 2729K neutron-openvswi-o583c7038-d all -- * * 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-in tap583c7038-d3 --physdev-is-bridged3 12442 4163K ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0
如果是网桥从tap-XXX端口发出到VM的流量,则跳转到neutron-openvswi-i9LETTERID;如果是从tap-XXX端口进入到网桥的(即vm发出来的)流量,则跳转到neutron-openvswi-o9LETTERID。
#iptables --line-numbers -vnL neutron-openvswi-i583c7038-dChain neutron-openvswi-i583c7038-d (1 references)num pkts bytes target prot opt in out source destination1 0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 state INVALID2 400 43350 RETURN all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED3 1 60 RETURN tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:224 1 84 RETURN icmp -- * * 0.0.0.0/0 0.0.0.0/05 3885 1391K RETURN udp -- * * 192.168.0.3 0.0.0.0/0 udp spt:67 dpt:686 3885 1197K neutron-openvswi-sg-fallback all -- * * 0.0.0.0/0 0.0.0.0/0
neutron-openvswi-i9LETTERID允许安全组中配置的策略(允许ssh、ping等)和dhcp reply通过。默认的neutron-openvswi-sg-fallback将drop所有流量。
#iptables --line-numbers -vnL neutron-openvswi-o583c7038-dChain neutron-openvswi-o583c7038-d (2 references)num pkts bytes target prot opt in out source destination1 3886 1197K RETURN udp -- * * 0.0.0.0/0 0.0.0.0/0 udp spt:68 dpt:672 4274 1533K neutron-openvswi-s583c7038-d all -- * * 0.0.0.0/0 0.0.0.0/03 0 0 DROP udp -- * * 0.0.0.0/0 0.0.0.0/0 udp spt:67 dpt:684 0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 state INVALID5 3963 1507K RETURN all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED6 311 25752 RETURN all -- * * 0.0.0.0/0 0.0.0.0/07 0 0 neutron-openvswi-sg-fallback all -- * * 0.0.0.0/0 0.0.0.0/0
neutron-openvswi-o9LETTERID将跳转到neutron-openvswi-s583c7038-d,允许DHCP Request和匹配VM的源IP和源MAC的流量通过。