mirror of
https://github.com/CumulusNetworks/ifupdown2.git
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77021aa1ce
Ticket: CM-10857 Reviewed By: julien, nikhil Testing Done: Tested moving from a dhcp to static addr method for eth0 before the patch: - when moving from dhcp to static address method, after releasing the dhcp address, it takes a few seconds for the dhcp address to go away. When we query addresses to configure, there is a chance that we may end up getting the dhcp address for a few seconds. Which is ok until when the static address to be configured is same as the dhcp address. In which case we end up not configuring the static address because we think it is already configured (per the running list). After this patch: - when moving from dhcp to static address method, we always re-apply the address config avoiding the chance of not configuring an address due to a dhcp address sticking around. Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
545 lines
24 KiB
Python
545 lines
24 KiB
Python
#!/usr/bin/python
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#
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# Copyright 2014 Cumulus Networks, Inc. All rights reserved.
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# Author: Roopa Prabhu, roopa@cumulusnetworks.com
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#
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import os
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try:
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from ipaddr import IPNetwork
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from sets import Set
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from ifupdown.iface import *
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from ifupdownaddons.modulebase import moduleBase
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from ifupdownaddons.iproute2 import iproute2
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from ifupdownaddons.dhclient import dhclient
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import ifupdown.policymanager as policymanager
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import ifupdown.rtnetlink_api as rtnetlink_api
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import ifupdown.ifupdownconfig as ifupdownConfig
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import ifupdown.ifupdownflags as ifupdownflags
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except ImportError, e:
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raise ImportError (str(e) + "- required module not found")
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class address(moduleBase):
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""" ifupdown2 addon module to configure address, mtu, hwaddress, alias
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(description) on an interface """
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_modinfo = {'mhelp' : 'address configuration module for interfaces',
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'attrs': {
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'address' :
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{'help' : 'ipv4 or ipv6 addresses',
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'example' : ['address 10.0.12.3/24',
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'address 2000:1000:1000:1000:3::5/128']},
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'netmask' :
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{'help': 'netmask',
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'example' : ['netmask 255.255.255.0'],
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'compat' : True},
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'broadcast' :
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{'help': 'broadcast address',
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'example' : ['broadcast 10.0.1.255']},
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'scope' :
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{'help': 'scope',
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'example' : ['scope host']},
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'preferred-lifetime' :
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{'help': 'preferred lifetime',
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'example' : ['preferred-lifetime forever',
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'preferred-lifetime 10']},
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'gateway' :
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{'help': 'default gateway',
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'example' : ['gateway 255.255.255.0']},
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'mtu' :
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{ 'help': 'interface mtu',
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'example' : ['mtu 1600'],
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'default' : '1500'},
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'hwaddress' :
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{'help' : 'hw address',
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'example': ['hwaddress 44:38:39:00:27:b8']},
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'alias' :
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{ 'help': 'description/alias',
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'example' : ['alias testnetwork']},
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'address-purge' :
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{ 'help': 'purge existing addresses. By default ' +
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'any existing ip addresses on an interface are ' +
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'purged to match persistant addresses in the ' +
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'interfaces file. Set this attribute to \'no\'' +
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'if you want to preserve existing addresses',
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'default' : 'yes',
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'example' : ['address-purge yes/no']},
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'clagd-vxlan-anycast-ip' :
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{ 'help' : 'Anycast local IP address for ' +
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'dual connected VxLANs',
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'example' : ['clagd-vxlan-anycast-ip 36.0.0.11']}}}
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def __init__(self, *args, **kargs):
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moduleBase.__init__(self, *args, **kargs)
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self.ipcmd = None
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self._bridge_fdb_query_cache = {}
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self.default_mtu = policymanager.policymanager_api.get_attr_default(module_name=self.__class__.__name__, attr='mtu')
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def _address_valid(self, addrs):
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if not addrs:
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return False
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if any(map(lambda a: True if a[:7] != '0.0.0.0'
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else False, addrs)):
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return True
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return False
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def _get_hwaddress(self, ifaceobj):
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hwaddress = ifaceobj.get_attr_value_first('hwaddress')
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if hwaddress and hwaddress.startswith("ether"):
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hwaddress = hwaddress[5:].strip()
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return hwaddress
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def _process_bridge(self, ifaceobj, up):
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hwaddress = self._get_hwaddress(ifaceobj)
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addrs = ifaceobj.get_attr_value_first('address')
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is_vlan_dev_on_vlan_aware_bridge = False
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is_bridge = self.ipcmd.is_bridge(ifaceobj.name)
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if not is_bridge:
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if '.' in ifaceobj.name:
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(bridgename, vlan) = ifaceobj.name.split('.')
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is_vlan_dev_on_vlan_aware_bridge = self.ipcmd.bridge_is_vlan_aware(bridgename)
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if ((is_bridge and not self.ipcmd.bridge_is_vlan_aware(ifaceobj.name))
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or is_vlan_dev_on_vlan_aware_bridge):
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if self._address_valid(addrs):
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if up:
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self.write_file('/proc/sys/net/ipv4/conf/%s' %ifaceobj.name +
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'/arp_accept', '1')
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else:
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self.write_file('/proc/sys/net/ipv4/conf/%s' %ifaceobj.name +
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'/arp_accept', '0')
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if hwaddress and is_vlan_dev_on_vlan_aware_bridge:
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if up:
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self.ipcmd.bridge_fdb_add(bridgename, hwaddress, vlan)
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else:
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self.ipcmd.bridge_fdb_del(bridgename, hwaddress, vlan)
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def _get_anycast_addr(self, ifaceobjlist):
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for ifaceobj in ifaceobjlist:
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anycast_addr = ifaceobj.get_attr_value_first('clagd-vxlan-anycast-ip')
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if anycast_addr:
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anycast_addr = anycast_addr+'/32'
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return anycast_addr
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return None
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def _inet_address_convert_to_cidr(self, ifaceobjlist):
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newaddrs = []
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newaddr_attrs = {}
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for ifaceobj in ifaceobjlist:
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addrs = ifaceobj.get_attr_value('address')
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if not addrs:
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continue
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if (((ifaceobj.role & ifaceRole.SLAVE) and
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not (ifaceobj.link_privflags & ifaceLinkPrivFlags.VRF_SLAVE)) or
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((ifaceobj.link_kind & ifaceLinkKind.BRIDGE) and
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(ifaceobj.link_privflags & ifaceLinkPrivFlags.BRIDGE_VLAN_AWARE))):
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# we must not configure an IP address if the interface is
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# enslaved or is a VLAN AWARE BRIDGE
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self.logger.info('%s: ignoring ip address. Interface is '
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'enslaved or a vlan aware bridge and cannot'
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' have an IP Address' %(ifaceobj.name))
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return (False, newaddrs, newaddr_attrs)
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# If user address is not in CIDR notation, convert them to CIDR
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for addr_index in range(0, len(addrs)):
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addr = addrs[addr_index]
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if '/' in addr:
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newaddrs.append(addr)
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continue
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newaddr = addr
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netmask = ifaceobj.get_attr_value_n('netmask', addr_index)
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if netmask:
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prefixlen = IPNetwork('%s' %addr +
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'/%s' %netmask).prefixlen
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newaddr = addr + '/%s' %prefixlen
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newaddrs.append(newaddr)
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attrs = {}
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for a in ['broadcast', 'pointopoint', 'scope',
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'preferred-lifetime']:
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aval = ifaceobj.get_attr_value_n(a, addr_index)
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if aval:
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attrs[a] = aval
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if attrs:
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newaddr_attrs[newaddr]= attrs
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return (True, newaddrs, newaddr_attrs)
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def _inet_address_list_config(self, ifaceobj, newaddrs, newaddr_attrs):
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for addr_index in range(0, len(newaddrs)):
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try:
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if newaddr_attrs:
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self.ipcmd.addr_add(ifaceobj.name, newaddrs[addr_index],
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newaddr_attrs.get(newaddrs[addr_index],
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{}).get('broadcast'),
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newaddr_attrs.get(newaddrs[addr_index],
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{}).get('pointopoint'),
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newaddr_attrs.get(newaddrs[addr_index],
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{}).get('scope'),
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newaddr_attrs.get(newaddrs[addr_index],
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{}).get('preferred-lifetime'))
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else:
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self.ipcmd.addr_add(ifaceobj.name, newaddrs[addr_index])
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except Exception, e:
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self.log_error(str(e))
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def _inet_address_config(self, ifaceobj, ifaceobj_getfunc=None,
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force_reapply=False):
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squash_addr_config = (True if \
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ifupdownConfig.config.get('addr_config_squash', \
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'0') == '1' else False)
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if (squash_addr_config and
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not (ifaceobj.flags & ifaceobj.YOUNGEST_SIBLING)):
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return
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purge_addresses = ifaceobj.get_attr_value_first('address-purge')
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if not purge_addresses:
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purge_addresses = 'yes'
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if squash_addr_config and ifaceobj.flags & iface.HAS_SIBLINGS:
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ifaceobjlist = ifaceobj_getfunc(ifaceobj.name)
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else:
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ifaceobjlist = [ifaceobj]
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(addr_supported, newaddrs, newaddr_attrs) = self._inet_address_convert_to_cidr(ifaceobjlist)
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if not addr_supported:
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return
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if (not squash_addr_config and (ifaceobj.flags & iface.HAS_SIBLINGS)):
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# if youngest sibling and squash addr is not set
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# print a warning that addresses will not be purged
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if (ifaceobj.flags & iface.YOUNGEST_SIBLING):
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self.logger.warn('%s: interface has multiple ' %ifaceobj.name +
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'iface stanzas, skip purging existing addresses')
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purge_addresses = 'no'
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if not ifupdownflags.flags.PERFMODE and purge_addresses == 'yes':
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# if perfmode is not set and purge addresses is not set to 'no'
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# lets purge addresses not in the config
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runningaddrs = self.ipcmd.addr_get(ifaceobj.name, details=False)
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# if anycast address is configured on 'lo' and is in running config
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# add it to newaddrs so that ifreload doesn't wipe it out
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anycast_addr = self._get_anycast_addr(ifaceobjlist)
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if runningaddrs and anycast_addr and anycast_addr in runningaddrs:
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newaddrs.append(anycast_addr)
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if newaddrs == runningaddrs:
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if force_reapply:
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self._inet_address_list_config(ifaceobj, newaddrs, newaddr_attrs)
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return
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try:
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# if primary address is not same, there is no need to keep any.
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# reset all addresses
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if (newaddrs and runningaddrs and
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(newaddrs[0] != runningaddrs[0])):
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self.ipcmd.del_addr_all(ifaceobj.name)
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else:
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self.ipcmd.del_addr_all(ifaceobj.name, newaddrs)
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except Exception, e:
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self.log_warn(str(e))
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if not newaddrs:
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return
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self._inet_address_list_config(ifaceobj, newaddrs, newaddr_attrs)
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def _up(self, ifaceobj, ifaceobj_getfunc=None):
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if not self.ipcmd.link_exists(ifaceobj.name):
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return
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addr_method = ifaceobj.addr_method
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force_reapply = False
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try:
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# release any stale dhcp addresses if present
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if (addr_method != "dhcp" and not ifupdownflags.flags.PERFMODE and
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not (ifaceobj.flags & iface.HAS_SIBLINGS)):
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# if not running in perf mode and ifaceobj does not have
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# any sibling iface objects, kill any stale dhclient
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# processes
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dhclientcmd = dhclient()
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if dhclientcmd.is_running(ifaceobj.name):
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# release any dhcp leases
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dhclientcmd.release(ifaceobj.name)
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force_reapply = True
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elif dhclientcmd.is_running6(ifaceobj.name):
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dhclientcmd.release6(ifaceobj.name)
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force_reapply = True
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except:
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pass
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self.ipcmd.batch_start()
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if addr_method != "dhcp":
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self._inet_address_config(ifaceobj, ifaceobj_getfunc,
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force_reapply)
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mtu = ifaceobj.get_attr_value_first('mtu')
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if mtu:
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self.ipcmd.link_set(ifaceobj.name, 'mtu', mtu)
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elif (not ifaceobj.link_kind and
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not (ifaceobj.link_privflags & ifaceLinkPrivFlags.BOND_SLAVE) and
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self.default_mtu):
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# logical devices like bridges and vlan devices rely on mtu
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# from their lower devices. ie mtu travels from
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# lower devices to upper devices. For bonds mtu travels from
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# upper to lower devices. running mtu depends on upper and
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# lower device mtu. With all this implicit mtu
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# config by the kernel in play, we try to be cautious here
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# on which devices we want to reset mtu to default.
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# essentially only physical interfaces which are not bond slaves
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running_mtu = self.ipcmd.link_get_mtu(ifaceobj.name)
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if running_mtu != self.default_mtu:
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self.ipcmd.link_set(ifaceobj.name, 'mtu', self.default_mtu)
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alias = ifaceobj.get_attr_value_first('alias')
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if alias:
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self.ipcmd.link_set_alias(ifaceobj.name, alias)
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self.ipcmd.batch_commit()
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hwaddress = self._get_hwaddress(ifaceobj)
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if hwaddress:
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running_hwaddress = None
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if not ifupdownflags.flags.PERFMODE: # system is clean
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running_hwaddress = self.ipcmd.link_get_hwaddress(ifaceobj.name)
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if hwaddress != running_hwaddress:
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slave_down = False
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rtnetlink_api.rtnl_api.link_set(ifaceobj.name, "down")
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if ifaceobj.link_kind & ifaceLinkKind.BOND:
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# if bond, down all the slaves
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if ifaceobj.lowerifaces:
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for l in ifaceobj.lowerifaces:
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rtnetlink_api.rtnl_api.link_set(l, "down")
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slave_down = True
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try:
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self.ipcmd.link_set(ifaceobj.name, 'address', hwaddress)
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finally:
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rtnetlink_api.rtnl_api.link_set(ifaceobj.name, "up")
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if slave_down:
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for l in ifaceobj.lowerifaces:
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rtnetlink_api.rtnl_api.link_set(l, "up")
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try:
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# Handle special things on a bridge
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self._process_bridge(ifaceobj, True)
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except Exception, e:
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self.log_warn('%s: %s' %(ifaceobj.name, str(e)))
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pass
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if addr_method != "dhcp":
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self.ipcmd.route_add_gateway(ifaceobj.name,
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ifaceobj.get_attr_value_first('gateway'),
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ifaceobj.get_attr_value_first('vrf'))
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def _down(self, ifaceobj, ifaceobj_getfunc=None):
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try:
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if not self.ipcmd.link_exists(ifaceobj.name):
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return
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addr_method = ifaceobj.addr_method
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if addr_method != "dhcp":
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self.ipcmd.route_del_gateway(ifaceobj.name,
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ifaceobj.get_attr_value_first('gateway'),
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ifaceobj.get_attr_value_first('vrf'),
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ifaceobj.get_attr_value_first('metric'))
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if ifaceobj.get_attr_value_first('address-purge')=='no':
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addrlist = ifaceobj.get_attr_value('address')
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for addr in addrlist:
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self.ipcmd.addr_del(ifaceobj.name, addr)
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#self.ipcmd.addr_del(ifaceobj.name, ifaceobj.get_attr_value('address')[0])
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else:
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self.ipcmd.del_addr_all(ifaceobj.name)
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mtu = ifaceobj.get_attr_value_first('mtu')
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if (not ifaceobj.link_kind and mtu and
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self.default_mtu and (mtu != self.default_mtu)):
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self.ipcmd.link_set(ifaceobj.name, 'mtu', self.default_mtu)
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alias = ifaceobj.get_attr_value_first('alias')
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if alias:
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filename = '/sys/class/net/%s/ifalias' %ifaceobj.name
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self.logger.info('executing echo "" > %s' %filename)
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os.system('echo "" > %s' %filename)
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# XXX hwaddress reset cannot happen because we dont know last
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# address.
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# Handle special things on a bridge
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self._process_bridge(ifaceobj, False)
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except Exception, e:
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self.logger.debug('%s : %s' %(ifaceobj.name, str(e)))
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pass
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def _get_iface_addresses(self, ifaceobj):
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addrlist = ifaceobj.get_attr_value('address')
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outaddrlist = []
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if not addrlist: return None
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for addrindex in range(0, len(addrlist)):
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addr = addrlist[addrindex]
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netmask = ifaceobj.get_attr_value_n('netmask', addrindex)
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if netmask:
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prefixlen = IPNetwork('%s' %addr +
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'/%s' %netmask).prefixlen
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addr = addr + '/%s' %prefixlen
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outaddrlist.append(addr)
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return outaddrlist
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def _get_bridge_fdbs(self, bridgename, vlan):
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fdbs = self._bridge_fdb_query_cache.get(bridgename)
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if not fdbs:
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fdbs = self.ipcmd.bridge_fdb_show_dev(bridgename)
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if not fdbs:
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return
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self._bridge_fdb_query_cache[bridgename] = fdbs
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return fdbs.get(vlan)
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def _check_addresses_in_bridge(self, ifaceobj, hwaddress):
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""" If the device is a bridge, make sure the addresses
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are in the bridge """
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if '.' in ifaceobj.name:
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(bridgename, vlan) = ifaceobj.name.split('.')
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if self.ipcmd.bridge_is_vlan_aware(bridgename):
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fdb_addrs = self._get_bridge_fdbs(bridgename, vlan)
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if not fdb_addrs or hwaddress not in fdb_addrs:
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return False
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return True
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def _query_check(self, ifaceobj, ifaceobjcurr, ifaceobj_getfunc=None):
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runningaddrsdict = None
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if not self.ipcmd.link_exists(ifaceobj.name):
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self.logger.debug('iface %s not found' %ifaceobj.name)
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return
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addr_method = ifaceobj.addr_method
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self.query_n_update_ifaceobjcurr_attr(ifaceobj, ifaceobjcurr,
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'mtu', self.ipcmd.link_get_mtu)
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hwaddress = self._get_hwaddress(ifaceobj)
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if hwaddress:
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rhwaddress = self.ipcmd.link_get_hwaddress(ifaceobj.name)
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if not rhwaddress or rhwaddress != hwaddress:
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ifaceobjcurr.update_config_with_status('hwaddress', rhwaddress,
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1)
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elif not self._check_addresses_in_bridge(ifaceobj, hwaddress):
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# XXX: hw address is not in bridge
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ifaceobjcurr.update_config_with_status('hwaddress', rhwaddress,
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1)
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ifaceobjcurr.status_str = 'bridge fdb error'
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else:
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ifaceobjcurr.update_config_with_status('hwaddress', rhwaddress,
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0)
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self.query_n_update_ifaceobjcurr_attr(ifaceobj, ifaceobjcurr,
|
|
'alias', self.ipcmd.link_get_alias)
|
|
# compare addresses
|
|
if addr_method == 'dhcp':
|
|
return
|
|
addrs = self._get_iface_addresses(ifaceobj)
|
|
runningaddrsdict = self.ipcmd.addr_get(ifaceobj.name)
|
|
# if anycast address is configured on 'lo' and is in running config
|
|
# add it to addrs so that query_check doesn't fail
|
|
anycast_addr = ifaceobj.get_attr_value_first('clagd-vxlan-anycast-ip')
|
|
if anycast_addr:
|
|
anycast_addr = anycast_addr+'/32'
|
|
if runningaddrsdict and anycast_addr and runningaddrsdict.get(anycast_addr):
|
|
addrs.append(anycast_addr)
|
|
|
|
# Set ifaceobjcurr method and family
|
|
ifaceobjcurr.addr_method = ifaceobj.addr_method
|
|
ifaceobjcurr.addr_family = ifaceobj.addr_family
|
|
if not runningaddrsdict and not addrs:
|
|
return
|
|
runningaddrs = runningaddrsdict.keys() if runningaddrsdict else []
|
|
if runningaddrs != addrs:
|
|
runningaddrsset = set(runningaddrs) if runningaddrs else set([])
|
|
addrsset = set(addrs) if addrs else set([])
|
|
if (ifaceobj.flags & iface.HAS_SIBLINGS):
|
|
if not addrsset:
|
|
return
|
|
# only check for addresses present in running config
|
|
addrsdiff = addrsset.difference(runningaddrsset)
|
|
for addr in addrs:
|
|
if addr in addrsdiff:
|
|
ifaceobjcurr.update_config_with_status('address',
|
|
addr, 1)
|
|
else:
|
|
ifaceobjcurr.update_config_with_status('address',
|
|
addr, 0)
|
|
else:
|
|
addrsdiff = addrsset.symmetric_difference(runningaddrsset)
|
|
for addr in addrsset.union(runningaddrsset):
|
|
if addr in addrsdiff:
|
|
ifaceobjcurr.update_config_with_status('address',
|
|
addr, 1)
|
|
else:
|
|
ifaceobjcurr.update_config_with_status('address',
|
|
addr, 0)
|
|
elif addrs:
|
|
[ifaceobjcurr.update_config_with_status('address',
|
|
addr, 0) for addr in addrs]
|
|
#XXXX Check broadcast address, scope, etc
|
|
return
|
|
|
|
def _query_running(self, ifaceobjrunning, ifaceobj_getfunc=None):
|
|
if not self.ipcmd.link_exists(ifaceobjrunning.name):
|
|
self.logger.debug('iface %s not found' %ifaceobjrunning.name)
|
|
return
|
|
dhclientcmd = dhclient()
|
|
if (dhclientcmd.is_running(ifaceobjrunning.name) or
|
|
dhclientcmd.is_running6(ifaceobjrunning.name)):
|
|
# If dhcp is configured on the interface, we skip it
|
|
return
|
|
isloopback = self.ipcmd.link_isloopback(ifaceobjrunning.name)
|
|
if isloopback:
|
|
default_addrs = ['127.0.0.1/8', '::1/128']
|
|
ifaceobjrunning.addr_family = 'inet'
|
|
ifaceobjrunning.addr_method = 'loopback'
|
|
else:
|
|
default_addrs = []
|
|
runningaddrsdict = self.ipcmd.addr_get(ifaceobjrunning.name)
|
|
if runningaddrsdict:
|
|
[ifaceobjrunning.update_config('address', addr)
|
|
for addr, addrattrs in runningaddrsdict.items()
|
|
if addr not in default_addrs]
|
|
mtu = self.ipcmd.link_get_mtu(ifaceobjrunning.name)
|
|
if (mtu and
|
|
(ifaceobjrunning.name == 'lo' and mtu != '16436') or
|
|
(ifaceobjrunning.name != 'lo' and
|
|
mtu != self.get_mod_subattr('mtu', 'default'))):
|
|
ifaceobjrunning.update_config('mtu', mtu)
|
|
alias = self.ipcmd.link_get_alias(ifaceobjrunning.name)
|
|
if alias:
|
|
ifaceobjrunning.update_config('alias', alias)
|
|
|
|
_run_ops = {'up' : _up,
|
|
'down' : _down,
|
|
'query-checkcurr' : _query_check,
|
|
'query-running' : _query_running }
|
|
|
|
def get_ops(self):
|
|
""" returns list of ops supported by this module """
|
|
return self._run_ops.keys()
|
|
|
|
def _init_command_handlers(self):
|
|
if not self.ipcmd:
|
|
self.ipcmd = iproute2()
|
|
|
|
def run(self, ifaceobj, operation, query_ifaceobj=None, ifaceobj_getfunc=None):
|
|
""" run address configuration on the interface object passed as argument
|
|
|
|
Args:
|
|
**ifaceobj** (object): iface object
|
|
|
|
**operation** (str): any of 'up', 'down', 'query-checkcurr',
|
|
'query-running'
|
|
Kwargs:
|
|
query_ifaceobj (object): query check ifaceobject. This is only
|
|
valid when op is 'query-checkcurr'. It is an object same as
|
|
ifaceobj, but contains running attribute values and its config
|
|
status. The modules can use it to return queried running state
|
|
of interfaces. status is success if the running state is same
|
|
as user required state in ifaceobj. error otherwise.
|
|
"""
|
|
if ifaceobj.type == ifaceType.BRIDGE_VLAN:
|
|
return
|
|
op_handler = self._run_ops.get(operation)
|
|
if not op_handler:
|
|
return
|
|
self._init_command_handlers()
|
|
if operation == 'query-checkcurr':
|
|
op_handler(self, ifaceobj, query_ifaceobj,
|
|
ifaceobj_getfunc=ifaceobj_getfunc)
|
|
else:
|
|
op_handler(self, ifaceobj,
|
|
ifaceobj_getfunc=ifaceobj_getfunc)
|