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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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* Only matching flags and fields used by modern RFC2890 "extended GRE" -
this is backwards-compatible, but does not match all possible flags.
* There are no nftables helpers for the GRE key field, which is critical
to match individual tunnel sessions (more detail in the forum post)
* nft expression syntax is not flexible enough for multiple field
matches in a single rule and the key offset changes depending on flags.
* Thus, clumsy compromise in requiring an explicit match on the "checksum"
flag if a key is present, so we know where key will be. In most cases,
nobody uses the checksum, but assuming it to be off or automatically
adding a "not checksum" match unless told otherwise would be confusing
* The automatic "flags key" check when specifying a key doesn't have similar
validation, I added it first and it makes sense. I would still like
to find a workaround to the "checksum" offset problem.
* If we could add 2 rules from 1 config definition, we could match
both cases with appropriate offsets, but this would break existing
FW generation logic, logging, etc.
* Added a "test_gre_match" smoketest
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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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new chains, priorities, and firewall groups
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(#3616)
* Change ipsec match-ipsec/none to match-ipsec-in and match-none-in for
fw rules
* Add ipsec match-ipsec-out and match-none-out
* Change all the points where the match-ipsec.xml.i include was used
before, making sure the new includes (match-ipsec-in/out.xml.i) are
used appropriately. There were a handful of spots where match-ipsec.xml.i
had snuck back in for output hooked chains already
(the common-rule-* includes)
* Add the -out generators to rendered templates
* Heavy modification to firewall config validators:
* I needed to check for ipsec-in matches no matter how deeply nested
under an output-hook chain(via jump-target) - this always generates
an error.
* Ended up retrofitting the jump-targets validator from root chains
and for named custom chains. It checks for recursive loops and improper
IPsec matches.
* Added "test_ipsec_metadata_match" and "test_cyclic_jump_validation"
smoketests
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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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Make the code more uniform and maintainable.
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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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since it's not supported.
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`include/firewall/rule-log-options.xml.i` is now more aptly renamed to
`include/firewall/log-options.xml.i`.
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This file is a left over from previous refactoring and no longer
referenced anywhere in the interface definitions.
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Rename chain level defaults log option from `enable-default-log` to
`default-log` for consistency.
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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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<enable|disable> commands; log and state moved to new syntax.
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(valid for interfaces and groups) in firewal, nat and nat66.
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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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T5600: firewall: change constraints for inbound|outbound interface-name
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filter and in policy route.
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T5217: Add firewall synproxy
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Add ability to SYNPROXY connections
It is useful to protect against TCP SYN flood attacks and port-scanners
set firewall global-options syn-cookies 'enable'
set firewall ipv4 input filter rule 10 action 'synproxy'
set firewall ipv4 input filter rule 10 destination port '22'
set firewall ipv4 input filter rule 10 inbound-interface interface-name 'eth1'
set firewall ipv4 input filter rule 10 protocol 'tcp'
set firewall ipv4 input filter rule 10 synproxy tcp mss '1460'
set firewall ipv4 input filter rule 10 synproxy tcp window-scale '7'
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user can use VRF, and negated VRF, and configuration wonn't be broken after reboot.
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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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- Moves MSS node out of `tcp-flags.xml.i` and into `tcp-mss.xml.i`
- Update smoketest to verify TCP flag matching
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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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conntrack: T4309: T4903: Refactor `system conntrack ignore`, add IPv6 support and firewall groups
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add IPv6 support and firewall groups
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firewall cli
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with common matcher for ipv4 and ipv6, and use include on all chains for all this comman matchers
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<drop> to <accept> if default-action is not specified in base chains
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firewall ipv6 name ...> . Also fix some unexpected behaviour with geoip.
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Change code for new syntax
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balance within a single rule.
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