diff options
Diffstat (limited to 'src/conf_mode/policy.py')
| -rwxr-xr-x | src/conf_mode/policy.py | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/conf_mode/policy.py b/src/conf_mode/policy.py index f0348fe06..74f23948c 100755 --- a/src/conf_mode/policy.py +++ b/src/conf_mode/policy.py @@ -25,6 +25,27 @@ from vyos import frr from vyos import airbag airbag.enable() +def routing_policy_find(key, dictionary): + # Recursively traverse a dictionary and extract the value assigned to + # a given key as generator object. This is made for routing policies, + # thus also import/export is checked + for k, v in dictionary.items(): + if k == key: + if isinstance(v, dict): + for a, b in v.items(): + if a in ['import', 'export']: + yield b + else: + yield v + elif isinstance(v, dict): + for result in routing_policy_find(key, v): + yield result + elif isinstance(v, list): + for d in v: + if isinstance(d, dict): + for result in routing_policy_find(key, d): + yield result + def get_config(config=None): if config: conf = config @@ -35,6 +56,15 @@ def get_config(config=None): policy = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) + # We also need some additional information from the config, prefix-lists + # and route-maps for instance. They will be used in verify(). + # + # XXX: one MUST always call this without the key_mangling() option! See + # vyos.configverify.verify_common_route_maps() for more information. + tmp = conf.get_config_dict(['protocols'], key_mangling=('-', '_'), + no_tag_node_value_mangle=True) + # Merge policy dict into "regular" config dict + policy = dict_merge(tmp, policy) return policy def verify(policy): @@ -102,6 +132,37 @@ def verify(policy): if tmp and tmp not in policy.get('large_community_list', []): raise ConfigError(f'large-community-list {tmp} does not exist!') + # Specified prefix-list must exist + tmp = dict_search('match.ip.address.prefix_list', rule_config) + if tmp and tmp not in policy.get('prefix_list', []): + raise ConfigError(f'prefix-list {tmp} does not exist!') + + # Specified prefix-list must exist + tmp = dict_search('match.ipv6.address.prefix_list', rule_config) + if tmp and tmp not in policy.get('prefix_list6', []): + raise ConfigError(f'prefix-list6 {tmp} does not exist!') + + # When routing protocols are active some use prefix-lists, route-maps etc. + # to apply the systems routing policy to the learned or redistributed routes. + # When the "routing policy" changes and policies, route-maps etc. are deleted, + # it is our responsibility to verify that the policy can not be deleted if it + # is used by any routing protocol + if 'protocols' in policy: + for policy_type in ['access_list', 'access_list6', 'as_path_list', 'community_list', + 'extcommunity_list', 'large_community_list', 'prefix_list', 'route_map']: + if policy_type in policy: + for policy_name in list(set(routing_policy_find(policy_type, policy['protocols']))): + found = False + if policy_name in policy[policy_type]: + found = True + # BGP uses prefix-list for selecting both an IPv4 or IPv6 AFI related + # list - we need to go the extra mile here and check both prefix-lists + if policy_type == 'prefix_list' and 'prefix_list6' in policy and policy_name in policy['prefix_list6']: + found = True + if not found: + tmp = policy_type.replace('_','-') + raise ConfigError(f'Can not delete {tmp} "{name}", still in use!') + return None def generate(policy): |