| # Copyright 2020 - The Android Open Source Project |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| import collections |
| |
| |
| class RadvdConfig(object): |
| """The root settings for the router advertisement daemon. |
| |
| All the settings for a router advertisement daemon. |
| """ |
| def __init__(self, |
| prefix, |
| clients=[], |
| route=None, |
| rdnss=[], |
| ignore_if_missing=None, |
| adv_send_advert=None, |
| unicast_only=None, |
| max_rtr_adv_interval=None, |
| min_rtr_adv_interval=None, |
| min_delay_between_ras=None, |
| adv_managed_flag=None, |
| adv_other_config_flag=None, |
| adv_link_mtu=None, |
| adv_reachable_time=None, |
| adv_retrans_timer=None, |
| adv_cur_hop_limit=None, |
| adv_default_lifetime=None, |
| adv_default_preference=None, |
| adv_source_ll_address=None, |
| adv_home_agent_flag=None, |
| adv_home_agent_info=None, |
| home_agent_lifetime=None, |
| home_agent_preference=None, |
| adv_mob_rtr_support_flag=None, |
| adv_interval_opt=None, |
| adv_on_link=None, |
| adv_autonomous=None, |
| adv_router_addr=None, |
| adv_valid_lifetime=None, |
| adv_preferred_lifetime=None, |
| base_6to4_interface=None, |
| adv_route_lifetime=None, |
| adv_route_preference=None, |
| adv_rdnss_preference=None, |
| adv_rdnss_open=None, |
| adv_rdnss_lifetime=None): |
| """Construct a RadvdConfig. |
| |
| Args: |
| prefix: IPv6 prefix and length, ie fd::/64 |
| clients: A list of IPv6 link local addresses that will be the only |
| clients served. All other IPv6 addresses will be ignored if |
| this list is present. |
| route: A route for the router advertisement with prefix. |
| rdnss: A list of recursive DNS servers |
| ignore_if_missing: A flag indicating whether or not the interface |
| is ignored if it does not exist at start-up. By default, |
| radvd exits. |
| adv_send_advert: A flag indicating whether or not the router sends |
| periodic router advertisements and responds to router |
| solicitations. |
| unicast_only: Indicates that the interface link type only supports |
| unicast. |
| max_rtr_adv_interval:The maximum time allowed between sending |
| unsolicited multicast router advertisements from the interface, |
| in seconds. Must be no less than 4 seconds and no greater than |
| 1800 seconds. |
| min_rtr_adv_interval: The minimum time allowed between sending |
| unsolicited multicast router advertisements from the interface, |
| in seconds. Must be no less than 3 seconds and no greater than |
| 0.75 * max_rtr_adv_interval. |
| min_delay_between_ras: The minimum time allowed between sending |
| multicast router advertisements from the interface, in seconds., |
| adv_managed_flag: When set, hosts use the administered (stateful) |
| protocol for address autoconfiguration in addition to any |
| addresses autoconfigured using stateless address |
| autoconfiguration. The use of this flag is described in |
| RFC 4862. |
| adv_other_config_flag: When set, hosts use the administered |
| (stateful) protocol for autoconfiguration of other (non-address) |
| information. The use of this flag is described in RFC 4862. |
| adv_link_mtu: The MTU option is used in router advertisement |
| messages to insure that all nodes on a link use the same MTU |
| value in those cases where the link MTU is not well known. |
| adv_reachable_time: The time, in milliseconds, that a node assumes |
| a neighbor is reachable after having received a reachability |
| confirmation. Used by the Neighbor Unreachability Detection |
| algorithm (see Section 7.3 of RFC 4861). A value of zero means |
| unspecified (by this router). |
| adv_retrans_timer: The time, in milliseconds, between retransmitted |
| Neighbor Solicitation messages. Used by address resolution and |
| the Neighbor Unreachability Detection algorithm (see Sections |
| 7.2 and 7.3 of RFC 4861). A value of zero means unspecified |
| (by this router). |
| adv_cur_hop_limit: The default value that should be placed in the |
| Hop Count field of the IP header for outgoing (unicast) IP |
| packets. The value should be set to the current diameter of the |
| Internet. The value zero means unspecified (by this router). |
| adv_default_lifetime: The lifetime associated with the default |
| router in units of seconds. The maximum value corresponds to |
| 18.2 hours. A lifetime of 0 indicates that the router is not a |
| default router and should not appear on the default router list. |
| The router lifetime applies only to the router's usefulness as |
| a default router; it does not apply to information contained in |
| other message fields or options. Options that need time limits |
| for their information include their own lifetime fields. |
| adv_default_preference: The preference associated with the default |
| router, as either "low", "medium", or "high". |
| adv_source_ll_address: When set, the link-layer address of the |
| outgoing interface is included in the RA. |
| adv_home_agent_flag: When set, indicates that sending router is able |
| to serve as Mobile IPv6 Home Agent. When set, minimum limits |
| specified by Mobile IPv6 are used for MinRtrAdvInterval and |
| MaxRtrAdvInterval. |
| adv_home_agent_info: When set, Home Agent Information Option |
| (specified by Mobile IPv6) is included in Router Advertisements. |
| adv_home_agent_flag must also be set when using this option. |
| home_agent_lifetime: The length of time in seconds (relative to the |
| time the packet is sent) that the router is offering Mobile IPv6 |
| Home Agent services. A value 0 must not be used. The maximum |
| lifetime is 65520 seconds (18.2 hours). This option is ignored, |
| if adv_home_agent_info is not set. |
| home_agent_preference: The preference for the Home Agent sending |
| this Router Advertisement. Values greater than 0 indicate more |
| preferable Home Agent, values less than 0 indicate less |
| preferable Home Agent. This option is ignored, if |
| adv_home_agent_info is not set. |
| adv_mob_rtr_support_flag: When set, the Home Agent signals it |
| supports Mobile Router registrations (specified by NEMO Basic). |
| adv_home_agent_info must also be set when using this option. |
| adv_interval_opt: When set, Advertisement Interval Option |
| (specified by Mobile IPv6) is included in Router Advertisements. |
| When set, minimum limits specified by Mobile IPv6 are used for |
| MinRtrAdvInterval and MaxRtrAdvInterval. |
| adv_on_linkWhen set, indicates that this prefix can be used for |
| on-link determination. When not set the advertisement makes no |
| statement about on-link or off-link properties of the prefix. |
| For instance, the prefix might be used for address configuration |
| with some of the addresses belonging to the prefix being |
| on-link and others being off-link. |
| adv_autonomous: When set, indicates that this prefix can be used for |
| autonomous address configuration as specified in RFC 4862. |
| adv_router_addr: When set, indicates that the address of interface |
| is sent instead of network prefix, as is required by Mobile |
| IPv6. When set, minimum limits specified by Mobile IPv6 are used |
| for MinRtrAdvInterval and MaxRtrAdvInterval. |
| adv_valid_lifetime: The length of time in seconds (relative to the |
| time the packet is sent) that the prefix is valid for the |
| purpose of on-link determination. The symbolic value infinity |
| represents infinity (i.e. a value of all one bits (0xffffffff)). |
| The valid lifetime is also used by RFC 4862. |
| adv_preferred_lifetimeThe length of time in seconds (relative to the |
| time the packet is sent) that addresses generated from the |
| prefix via stateless address autoconfiguration remain preferred. |
| The symbolic value infinity represents infinity (i.e. a value of |
| all one bits (0xffffffff)). See RFC 4862. |
| base_6to4_interface: If this option is specified, this prefix will |
| be combined with the IPv4 address of interface name to produce |
| a valid 6to4 prefix. The first 16 bits of this prefix will be |
| replaced by 2002 and the next 32 bits of this prefix will be |
| replaced by the IPv4 address assigned to interface name at |
| configuration time. The remaining 80 bits of the prefix |
| (including the SLA ID) will be advertised as specified in the |
| configuration file. |
| adv_route_lifetime: The lifetime associated with the route in units |
| of seconds. The symbolic value infinity represents infinity |
| (i.e. a value of all one bits (0xffffffff)). |
| adv_route_preference: The preference associated with the default |
| router, as either "low", "medium", or "high". |
| adv_rdnss_preference: The preference of the DNS server, compared to |
| other DNS servers advertised and used. 0 to 7 means less |
| important than manually configured nameservers in resolv.conf, |
| while 12 to 15 means more important. |
| adv_rdnss_open: "Service Open" flag. When set, indicates that RDNSS |
| continues to be available to hosts even if they moved to a |
| different subnet. |
| adv_rdnss_lifetime: The maximum duration how long the RDNSS entries |
| are used for name resolution. A value of 0 means the nameserver |
| should no longer be used. The maximum duration how long the |
| RDNSS entries are used for name resolution. A value of 0 means |
| the nameserver should no longer be used. The value, if not 0, |
| must be at least max_rtr_adv_interval. To ensure stale RDNSS |
| info gets removed in a timely fashion, this should not be |
| greater than 2*max_rtr_adv_interval. |
| """ |
| self._prefix = prefix |
| self._clients = clients |
| self._route = route |
| self._rdnss = rdnss |
| self._ignore_if_missing = ignore_if_missing |
| self._adv_send_advert = adv_send_advert |
| self._unicast_only = unicast_only |
| self._max_rtr_adv_interval = max_rtr_adv_interval |
| self._min_rtr_adv_interval = min_rtr_adv_interval |
| self._min_delay_between_ras = min_delay_between_ras |
| self._adv_managed_flag = adv_managed_flag |
| self._adv_other_config_flag = adv_other_config_flag |
| self._adv_link_mtu = adv_link_mtu |
| self._adv_reachable_time = adv_reachable_time |
| self._adv_retrans_timer = adv_retrans_timer |
| self._adv_cur_hop_limit = adv_cur_hop_limit |
| self._adv_default_lifetime = adv_default_lifetime |
| self._adv_default_preference = adv_default_preference |
| self._adv_source_ll_address = adv_source_ll_address |
| self._adv_home_agent_flag = adv_home_agent_flag |
| self._adv_home_agent_info = adv_home_agent_info |
| self._home_agent_lifetime = home_agent_lifetime |
| self._home_agent_preference = home_agent_preference |
| self._adv_mob_rtr_support_flag = adv_mob_rtr_support_flag |
| self._adv_interval_opt = adv_interval_opt |
| self._adv_on_link = adv_on_link |
| self._adv_autonomous = adv_autonomous |
| self._adv_router_addr = adv_router_addr |
| self._adv_valid_lifetime = adv_valid_lifetime |
| self._adv_preferred_lifetime = adv_preferred_lifetime |
| self._base_6to4_interface = base_6to4_interface |
| self._adv_route_lifetime = adv_route_lifetime |
| self._adv_route_preference = adv_route_preference |
| self._adv_rdnss_preference = adv_rdnss_preference |
| self._adv_rdnss_open = adv_rdnss_open |
| self._adv_rdnss_lifetime = adv_rdnss_lifetime |
| |
| def package_configs(self): |
| conf = dict() |
| conf['prefix'] = self._prefix |
| conf['clients'] = self._clients |
| conf['route'] = self._route |
| conf['rdnss'] = self._rdnss |
| |
| conf['interface_options'] = collections.OrderedDict( |
| filter(lambda pair: pair[1] is not None, |
| (('IgnoreIfMissing', self._ignore_if_missing), |
| ('AdvSendAdvert', self._adv_send_advert), |
| ('UnicastOnly', self._unicast_only), |
| ('MaxRtrAdvInterval', self._max_rtr_adv_interval), |
| ('MinRtrAdvInterval', self._min_rtr_adv_interval), |
| ('MinDelayBetweenRAs', self._min_delay_between_ras), |
| ('AdvManagedFlag', self._adv_managed_flag), |
| ('AdvOtherConfigFlag', self._adv_other_config_flag), |
| ('AdvLinkMTU', self._adv_link_mtu), |
| ('AdvReachableTime', self._adv_reachable_time), |
| ('AdvRetransTimer', self._adv_retrans_timer), |
| ('AdvCurHopLimit', self._adv_cur_hop_limit), |
| ('AdvDefaultLifetime', self._adv_default_lifetime), |
| ('AdvDefaultPreference', self._adv_default_preference), |
| ('AdvSourceLLAddress', self._adv_source_ll_address), |
| ('AdvHomeAgentFlag', self._adv_home_agent_flag), |
| ('AdvHomeAgentInfo', self._adv_home_agent_info), |
| ('HomeAgentLifetime', self._home_agent_lifetime), |
| ('HomeAgentPreference', self._home_agent_preference), |
| ('AdvMobRtrSupportFlag', self._adv_mob_rtr_support_flag), |
| ('AdvIntervalOpt', self._adv_interval_opt)))) |
| |
| conf['prefix_options'] = collections.OrderedDict( |
| filter(lambda pair: pair[1] is not None, |
| (('AdvOnLink', self._adv_on_link), |
| ('AdvAutonomous', self._adv_autonomous), |
| ('AdvRouterAddr', self._adv_router_addr), |
| ('AdvValidLifetime', self._adv_valid_lifetime), |
| ('AdvPreferredLifetime', self._adv_preferred_lifetime), |
| ('Base6to4Interface', self._base_6to4_interface)))) |
| |
| conf['route_options'] = collections.OrderedDict( |
| filter(lambda pair: pair[1] is not None, |
| (('AdvRouteLifetime', self._adv_route_lifetime), |
| ('AdvRoutePreference', self._adv_route_preference)))) |
| |
| conf['rdnss_options'] = collections.OrderedDict( |
| filter(lambda pair: pair[1] is not None, |
| (('AdvRDNSSPreference', self._adv_rdnss_preference), |
| ('AdvRDNSSOpen', self._adv_rdnss_open), |
| ('AdvRDNSSLifetime', self._adv_rdnss_lifetime)))) |
| |
| return conf |
