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The function verify_interface_exists requires a reference to the ambient
config_dict rather than creating an instance. As access is required to
the 'interfaces' path, provide as attribute of class ConfigDict, so as
not to confuse path searches of script-specific config_dict instances.
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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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wrong. Use nft -c option to check temporary file, and use output provided by nftables to parse the error if possible, or print it as it is if it's an unknown error
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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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With commit 770edf016838 ("T3900: T6394: extend functionalities in firewall;
move netfilter sysctl timeout parameters defined in conntrack to firewall
global-opton section.") the import of the glob module is no longer
required.
Found my running: make unused-imports
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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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firewall|nat rules.
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We will use _ as CLI level divider. The XML definition filename and also
the Python helper should match the CLI node.
Example:
set interfaces ethernet -> interfaces_ethernet.xml.in
set interfaces bond -> interfaces_bond.xml.in
set service dhcp-server -> service_dhcp-server-xml.in
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node_changed() will return a list of changed keys under "path". We are not
always interested what changed, sometimes we are only interested if something
changed at all, that what vyos.configdict.is_node_changed() is for.
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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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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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supports HW flowtable offload
- Add required offload setting for interfaces + flowtable offload (hw-tc-offload)
- Verification of interface support for hardware offloaded flowtables
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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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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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firewall: T3509: Add support for IPv6 reverse path filtering
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interface-name or interface-group
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firewall ipv6 name ...> . Also fix some unexpected behaviour with geoip.
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scripts and src firewall
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* T5195: move run, cmd, call, rc_cmd helper to vyos.utils.process
* T5195: use read_file and write_file implementation from vyos.utils.file
Changed code automatically using:
find . -type f -not -path '*/\.*' -exec sed -i 's/^from vyos.util import read_file$/from vyos.utils.file import read_file/g' {} +
find . -type f -not -path '*/\.*' -exec sed -i 's/^from vyos.util import write_file$/from vyos.utils.file import write_file/g' {} +
* T5195: move chmod* helpers to vyos.utils.permission
* T5195: use colon_separated_to_dict from vyos.utils.dict
* T5195: move is_systemd_service_* to vyos.utils.process
* T5195: fix boot issues with missing imports
* T5195: move dict_search_* helpers to vyos.utils.dict
* T5195: move network helpers to vyos.utils.network
* T5195: move commit_* helpers to vyos.utils.commit
* T5195: move user I/O helpers to vyos.utils.io
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We cannot use both 'port' and 'port-group' for the same direction
in one rule at the same time
Otherwise it generates wrong rules that don't block anything
set P_pgrp {
type inet_service
flags interval
auto-merge
elements = { 101-105 }
}
chain NAME_foo {
tcp dport 22 tcp dport @P_pgrp counter drop comment "foo-10"
counter return comment "foo default-action accept"
}
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T4780: Firewall: add firewall groups in firewall. Extend matching cri…
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firewall: T478: Fix firewall group circular dependency check
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so this new group can be used in inbound and outbound matcher
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`fqdn` node
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