diff options
Diffstat (limited to 'cloudinit/net/__init__.py')
| -rw-r--r-- | cloudinit/net/__init__.py | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/cloudinit/net/__init__.py b/cloudinit/net/__init__.py index e758006f..624c9b42 100644 --- a/cloudinit/net/__init__.py +++ b/cloudinit/net/__init__.py @@ -679,7 +679,7 @@ class EphemeralIPv4Network(object): """ def __init__(self, interface, ip, prefix_or_mask, broadcast, router=None, - connectivity_url=None): + connectivity_url=None, static_routes=None): """Setup context manager and validate call signature. @param interface: Name of the network interface to bring up. @@ -690,6 +690,7 @@ class EphemeralIPv4Network(object): @param router: Optionally the default gateway IP. @param connectivity_url: Optionally, a URL to verify if a usable connection already exists. + @param static_routes: Optionally a list of static routes from DHCP """ if not all([interface, ip, prefix_or_mask, broadcast]): raise ValueError( @@ -706,6 +707,7 @@ class EphemeralIPv4Network(object): self.ip = ip self.broadcast = broadcast self.router = router + self.static_routes = static_routes self.cleanup_cmds = [] # List of commands to run to cleanup state. def __enter__(self): @@ -718,7 +720,21 @@ class EphemeralIPv4Network(object): return self._bringup_device() - if self.router: + + # rfc3442 requires us to ignore the router config *if* classless static + # routes are provided. + # + # https://tools.ietf.org/html/rfc3442 + # + # If the DHCP server returns both a Classless Static Routes option and + # a Router option, the DHCP client MUST ignore the Router option. + # + # Similarly, if the DHCP server returns both a Classless Static Routes + # option and a Static Routes option, the DHCP client MUST ignore the + # Static Routes option. + if self.static_routes: + self._bringup_static_routes() + elif self.router: self._bringup_router() def __exit__(self, excp_type, excp_value, excp_traceback): @@ -762,6 +778,20 @@ class EphemeralIPv4Network(object): ['ip', '-family', 'inet', 'addr', 'del', cidr, 'dev', self.interface]) + def _bringup_static_routes(self): + # static_routes = [("169.254.169.254/32", "130.56.248.255"), + # ("0.0.0.0/0", "130.56.240.1")] + for net_address, gateway in self.static_routes: + via_arg = [] + if gateway != "0.0.0.0/0": + via_arg = ['via', gateway] + util.subp( + ['ip', '-4', 'route', 'add', net_address] + via_arg + + ['dev', self.interface], capture=True) + self.cleanup_cmds.insert( + 0, ['ip', '-4', 'route', 'del', net_address] + via_arg + + ['dev', self.interface]) + def _bringup_router(self): """Perform the ip commands to fully setup the router if needed.""" # Check if a default route exists and exit if it does |