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Add PoC for generating CGNAT rules
https://datatracker.ietf.org/doc/html/rfc6888
Not all requirements are implemented, but some of them.
Implemented:
REQ-2
```
A CGN MUST have a default "IP address pooling" behavior of "Paired"
CGN must use the same external IP
address mapping for all sessions associated with the same internal
IP address, be they TCP, UDP, ICMP, something else, or a mix of
different protocols.
```
REQ-3
```
The CGN function SHOULD NOT have any limitations on the size
or the contiguity of the external address pool
```
REQ-4
```
A CGN MUST support limiting the number of external ports (or,
equivalently, "identifiers" for ICMP) that are assigned per
subscriber
```
CLI:
```
set nat cgnat pool external ext1 external-port-range '1024-65535'
set nat cgnat pool external ext1 per-user-limit port '1000'
set nat cgnat pool external ext1 range 192.0.2.222/32
set nat cgnat pool internal int1 range '100.64.0.0/28'
set nat cgnat rule 10 source pool 'int1'
set nat cgnat rule 10 translation pool 'ext1'
```
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T4839: firewall: Add dynamic address group in firewall configuration
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appropiate commands to populate such groups using source and destination address of the packet.
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There is no need to add and remove this table during runtime - it can lurk
in the standard firewall init code.
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smoketest
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One can now do `set policy route foo default-log` which will add log
to the policy route chain.
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included in <set firewall global-options state-policy> node.
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to be able to catch logs using separte rule for default-action
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T5541: firewall zone: re add firewall zone-base firewall
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enables log capabilities for default-action in base chains. And of course, add option for enabling log for default-action
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A commit that removes `firewall bridge` will delete the table and not re-create it. Therefore any further firewall commit will fail trying to delete the non-existent bridge table. This commit ensures the table is always present (even if empty) to ensure successful commit.
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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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firewall, nat, nat66
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When rebasing https://github.com/vyos/vyos-1x/pull/2062, some additional
lines are mistakenly included.
https://github.com/vyos/vyos-1x/commit/45cfd569119b66abd2f0dfb954042b57921881bd
has removed the extra `}`, but the `{{ group_tmpl.groups(group, True)
}}` line needs to be removed as well.
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T4502: firewall: Add software flow offload using flowtable
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Linux netfilter patch https://patchwork.ozlabs.org/project/netfilter-devel/patch/d0f84a97f9c86bec4d537536a26d0150873e640d.1439559328.git.daniel@iogearbox.net/
adds direction support for conntrack zones, which makes it possible to
do NAT with conflicting IP address/port tuples from multiple, isolated tenants on a host.
According to the description of the kernel patch:
> ... overlapping tuples can be made unique with the zone identifier in
original direction, where the NAT engine will then allocate a unique
tuple in the commonly shared default zone for the reply direction.
I did some basic tests in my lab and it worked fine to forward packets
from eth0 to pppoe0.
- eth0 192.168.1.1/24 in VRF red
- pppoe0 dynamic public IP from ISP VRF default
- set vrf name red protocols static route 0.0.0.0/0 interface pppoe0 vrf 'default'
- set protocols static route 192.168.1.0/24 interface eth0 vrf 'red'
`conntrack -L` shows something like:
```
tcp 6 113 ESTABLISHED src=192.168.1.2 dst=1.1.1.1 sport=58946 dport=80 zone-orig=250 packets=6 bytes=391 src=1.1.1.1 dst=<my-public-ip> sport=80 dport=58946 packets=4 bytes=602 [ASSURED] mark=0 helper=tns use=1
```
It would be much appreciated if someone could test this with more
complex VRF setup.
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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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T4072: add firewall bridge filtering.
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forward chain and few matchers. Should be extended in the future.
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- Migrate IPv4 source-validation to nftables
- Interface source-validation value takes priority, fallback to global value
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firewall ipv6 name ...> . Also fix some unexpected behaviour with geoip.
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that contains fqnd and/or geo-ip in base chains. Fix mig script
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scripts and src firewall
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We cannot use some specific names like POSTROUTING/PREROUTING
as for PBR they overlaps with VyOS defined chains
Chains aftoconfigured by VyOS itself:
chain VYOS_PBR_PREROUTING
chain VYOS_PBR_POSTROUTING
If we try to use chain name "POSTROUTING" it generates 2 chains
with the same name "chain VYOS_PBR_POSTROUTING" one is
autoconfigured and the second defined by user
set policy route POSTROUTING rule 100
Add the user-defined (UD) prefix to separate user defined names
That allows to use any user-defined names
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T4780: Firewall: add firewall groups in firewall. Extend matching cri…
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so this new group can be used in inbound and outbound matcher
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<name> interface <ifname>`
* Include refactor to policy route to allow for deletion of mangle table instead of complex cleanup
* T4605: Rename mangle table to vyos_mangle
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`fqdn` node
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When log-level was introduced node `state-policy x log` was removed without migrator. This commit adds it back and improves log handling.
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* Rename table to vyos_nat
* Add static NAT smoketest
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* Rename table to vyos_nat
* Refactor tests to use `verify_nftables` format
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* Rename table to vyos_nat
* Refactor tests to use `verify_nftables` format
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T4699: Firewall: Add jump action in firewall ruleset
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vyos@vyos# show firewall
+name foo {
+ rule 1 {
+ action accept
+ packet-length 100
+ packet-length 105
+ packet-length 200-300
+ packet-length 220-250
+ }
+}
will report a nftables error upon load: Error: conflicting intervals specified
With nftables 1.0.3 there is an "auto-merge" option which corrects this:
https://lwn.net/Articles/896732/
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