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Fix typos and mistakes in the commands and comments
No functional changes
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firewalls should always accept
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Allow accepting invalid packets for ethernet types `8021q` and `8021ad`
in addition to ARP and UDP types so that stateful bridge firewall works
for VLAN-aware bridges in addition to regular bridges.
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Since the jump to the global state chain is inserted before all rules,
it wasn't possible to use offload with the global state policies
This commit adds a new chain for offloaded traffic in the forward
chain and jumps to that chain. Please enter the commit message for your changes. Lines starting
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Co-authored-by: Daniil Baturin <daniil@baturin.org>
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stateful bridge firewall. This patch is needed because ARP and DHCP are marked as invalid connections. Also, add ehternet-type matcher in bridge firewall.
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prerouting chain; re introduce <set vrf> in policy; change global options for passing traffic to IPvX firewall; update smoketest
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enabling/disabling sending traffic from bridge layer to ipvX layer
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timeout parameters defined in conntrack to firewall global-opton section.
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to firewall global-optinos
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included in <set firewall global-options state-policy> node.
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`set firewall flowtable <name> interface <ifname>`
`set firewall flowtable <name> offload [software|hardware]`
`set firewall [ipv4|ipv6] forward filter rule N action offload`
`set firewall [ipv4|ipv6] forward filter rule N offload-target <name>`
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The following commands will enable nftables flowtable offload on interfaces eth0 eth1:
```
set firewall global-options flow-offload software interface <name>
set firewall global-options flow-offload hardware interface <name>
```
Generated nftables rules:
```
table inet vyos_offload {
flowtable VYOS_FLOWTABLE_software {
hook ingress priority filter - 1; devices = { eth0, eth1, eth2, eth3 };
counter
}
chain VYOS_OFFLOAD_software {
type filter hook forward priority filter - 1; policy accept;
ct state { established, related } meta l4proto { tcp, udp } flow add @VYOS_FLOWTABLE_software
}
}
```
Use this option to count packets and bytes for each offloaded flow:
```
set system conntrack flow-accounting
```
To verify a connection is offloaded, run
```
cat /proc/net/nf_conntrack|grep OFFLOAD
```
This PR follows firewalld's implementation: https://github.com/firewalld/firewalld/blob/e748b97787d685d0ca93f58e8d4292e87d3f0da6/src/firewall/core/nftables.py#L590
A good introduction to nftables flowtable: https://thermalcircle.de/doku.php?id=blog:linux:flowtables_1_a_netfilter_nftables_fastpath
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