Nftables Configurations

This module includes the following parsers:

NftListRuleSet - command nft -j list ruleset

class insights.parsers.nftables.NftListRuleSet(context)

Bases: JSONParser

It parses the output of “nft -j list ruleset”.

Sample output:

{
    "nftables": [
        {
            "metainfo": {"version": "0.9.3", "release_name": "Topsy", "json_schema_version": 1}
        },
        {
            "table": {"family": "ip", "name": "table1"}
        },
        {
            "map": {
                "family": "ip", "name": "example_map", "table": "table1",
                "type": "ipv4_addr", "map": "verdict",
                "elem": [
                    ["192.0.2.1", {"accept": null}],
                    ["192.0.2.2", {"drop": null}],]
            }
        },
        {
            "chain": {
                "family": "ip", "table": "table1", "name": "chain1",
                "type": "filter", "hook": "input", "prio": 0,
                "policy": "accept"
            }
        },
        {
            "rule": {
                "family": "ip", "table": "table1", "chain": "chain1",
                "expr": [
                    {"vmap": {"key": {"payload": {"protocol": "ip", "field": "saddr"}},
                    "data": "@example_map"}}]
            }
        },
        {
            "rule": {
                "family": "ip", "table": "table1", "chain": "chain1",
                "expr": [
                    {"match": {
                        "op": "==",
                        "left": {"payload": {"protocol": "tcp", "field": "dport"}},
                        "right": 22}}
                ]
            }
        }
    ]
}

The json output is dict with a single “nftables” key, the value is a list of all data in nftables. To make it easier to use, here it makes use of insights.parsr.query.Entry and transfer the data to an Entry object and set it back to the data attribute.

data

An insights.parsr.query.Entry object containing all of the data as its children.

Type:

object

Raises:

SkipComponent -- No tables available.

Examples

>>> type(nft_obj)
<class 'insights.parsers.nftables.NftListRuleSet'>
>>> [str(item) for item in nft_obj.tables('ip')]   # change unicode to string to be compatible with python2.6/2.7
['table1']
>>> chains = nft_obj.chains('ip', 'table1')
>>> len(chains)
1
>>> str(chains[0]['name'].value)  # change unicode to string to be compatible with python2.6/2.7
'chain1'
>>> str(chains[0]['type'].value)  # change unicode to string to be compatible with python2.6/2.7
'filter'
>>> rules = nft_obj.rules('ip', 'table1', 'chain1')
>>> len(rules)
2
>>> rules[1]['expr']['match']['right'].value
22

chains(address_family, table_name)

list: Returns the chains in some table.

parse_content(content)

This method must be implemented by classes based on this class.

rules(address_family, table_name, chain_name)

list: Returns the rules of some chain in some table.

tables(address_family)

list: Return the table names in some address family.