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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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firewall node
* Refactor firewall and zone-policy rule creation and cleanup
* Migrate interface firewall values to `firewall interfaces <name> <direction> name/ipv6-name <name>`
* Remove `firewall-interface.py` conf script
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nat: T538: Add static NAT one-to-one
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Remove `default_action` from template "nftables-policy" as XML
policy route does not use it
Set default action 'accept' for policy route, as default action
'drop' must be used only for firewall and not related to the
policy route
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Ability to configure src/dst/translation port and protocol for
SNAT and DNAT IPv6
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From the doc miniupnpd
IP/mask format must be nnn.nnn.nnn.nnn/nn
Comment out invalid option "anchor"
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Ability to set static NAT (one-to-one) in one rule
set nat static rule 10 destination address '203.0.113.0/24'
set nat static rule 10 inbound-interface 'eth0'
set nat static rule 10 translation address '192.0.2.0/24'
It will be enough for PREROUTING and POSTROUTING rules
Use a separate table 'vyos_static_nat' as SRC/DST rules and
STATIC rules can have the same rule number
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Ability to configure SNAT destination prefix and
DNAT source address
Add option "!" - not address/prefix for NAT66
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* Refactor nftables clean-up code
* Adds policy route test for using firewall groups
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Domain group allows to filter addresses by domain main
Resolved addresses as elements are stored to named "nft set"
that used in the nftables rules
Also added a dynamic "resolver" systemd daemon
vyos-domain-group-resolve.service which starts python script
for the domain-group addresses resolving by timeout 300 sec
set firewall group domain-group DOMAINS address 'example.com'
set firewall group domain-group DOMAINS address 'example.org'
set firewall name FOO rule 10 action 'drop'
set firewall name FOO rule 10 source group domain-group 'DOMAINS'
set interfaces ethernet eth0 firewall local name 'FOO'
nft list table ip filter
table ip filter {
set DOMAINS {
type ipv4_addr
flags interval
elements = { 192.0.2.1, 192.0.2.85,
203.0.113.55, 203.0.113.58 }
}
chain NAME_FOO {
ip saddr @DOMAINS counter packets 0 bytes 0 drop comment "FOO-10"
counter packets 0 bytes 0 return comment "FOO default-action accept"
}
}
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