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Add support GRE/SIT tunnels. (#20)
This commit adds support for configuring GRE/IPIP/SIT tunnel interfaces as know
from previous versions of ifupdown. Currently only configuration checks for GRE
and SIT tunnels are implemented.
A tunnel interface configuration could look like this:
auto gre42
iface gre42 inet tunnel
mode gre
local 198.51.100.1
endpoint 203.0.113.2
#
# optional tunnel attributes
ttl 64
mtu 1400
tunnel-physdev eth0
#
address 192.0.2.42/31
address 2001:db8:d0c:23::42/64
auto he-ipv6
iface he-ipv6 inet tunnel
mode sit
endpoint 203.0.113.6
local 198.51.100.66
#
# optional tunnel attributes
ttl 255
mtu 1466
tunnel-physdev vrf_external
#
address 2001:db8:666::2/64
Signed-off-by: Maximilian Wilhelm <max@rfc2324.org>
This commit is contained in:
Maximilian Wilhelm
committed by
Julien Fortin
Julien Fortin
parent
db65511035
commit
2e2adb0e84
151
addons/tunnel.py
Normal file
151
addons/tunnel.py
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@@ -0,0 +1,151 @@
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#!/usr/bin/python
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#
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# Maximilian Wilhelm <max@rfc2324.org>
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# -- Mon 10 Oct 2016 10:53:13 PM CEST
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#
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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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import ifupdown.ifupdownflags as ifupdownflags
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import logging
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#
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# TODO: Add checks for ipip tunnels.
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#
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class tunnel (moduleBase):
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_modinfo = { 'mhelp' : 'create/configure GRE/IPIP/SIT tunnel interfaces',
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'attrs' : {
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'mode' :
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{ 'help' : 'type of tunnel as in \'ip link\' command.',
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'validvals' : ['gre' 'ipip', 'sit'],
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'required' : True,
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'example' : ['mode gre']},
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'local' :
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{ 'help' : 'IP of local tunnel endpoint',
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'validvals' : ['<ipv4>', '<ipv6>'],
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'required' : True,
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'example' : ['local 192.2.0.42']},
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'endpoint' :
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{ 'help' : 'IP of remote tunnel endpoint',
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'validvals' : ['<ipv4>', '<ipv6>'],
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'required' : True,
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'example' : ['endpoint 192.2.0.23']},
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'ttl' :
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{ 'help' : 'TTL for tunnel packets',
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'validvals' : ['<number>'],
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'required' : False,
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'example' : ['ttl 64']},
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'tunnel-physdev' :
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{ 'help' : 'Physical underlay device to use for tunnel packets',
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'validvals' : ['<interface>'],
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'required' : False,
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'example' : ['tunnel-physdev eth1']},
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}
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}
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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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def _is_my_interface (self, ifaceobj):
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if ifaceobj.addr_method == "tunnel" and ifaceobj.get_attr_value_first ('mode'):
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return True
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return False
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def _up (self, ifaceobj):
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attr_map = {
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# attr_name -> ip route param name
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'local' : 'local',
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'endpoint' : 'remote',
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'ttl' : 'ttl',
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'tunnel-physdev' : 'dev',
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}
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mode = ifaceobj.get_attr_value_first ('mode')
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attrs = {}
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# Only include attributes which have been set and map ifupdown2 names
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# to attribute names expected by iproute
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for attr, iproute_attr in attr_map.items ():
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attr_val = ifaceobj.get_attr_value_first (attr)
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if attr_val != None:
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attrs[iproute_attr] = attr_val
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self.ipcmd.link_create (ifaceobj.name, mode, attrs)
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def _down (self, ifaceobj):
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if not ifupdownflags.flags.PERFMODE and not self.ipcmd.link_exists (ifaceobj.name):
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return
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try:
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self.ipcmd.link_delete (ifaceobj.name)
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except Exception, e:
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self.log_warn (str (e))
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def _query_check_n_update (self, ifaceobj, ifaceobjcurr, attrname, attrval,
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running_attrval):
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if not ifaceobj.get_attr_value_first (attrname):
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return
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if running_attrval and attrval == running_attrval:
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ifaceobjcurr.update_config_with_status (attrname, attrval, 0)
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else:
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ifaceobjcurr.update_config_with_status (attrname, running_attrval, 1)
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def _query_check (self, ifaceobj, ifaceobjcurr):
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if not self.ipcmd.link_exists (ifaceobj.name):
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return
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tunattrs = self.ipcmd.link_get_linkinfo_attrs (ifaceobj.name)
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if not tunattrs:
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ifaceobjcurr.check_n_update_config_with_status_many (ifaceobj, self.get_mod_attrs (), -1)
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return
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for attr in self.get_mod_attrs ():
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if not ifaceobj.get_attr_value_first (attr):
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continue
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# Validate all interface attributes set in the config.
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# Remote any leading 'tunnel-' prefix in front of the attr name
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# when accessing tunattrs parsed from 'ip -d link'.
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self._query_check_n_update (ifaceobj, ifaceobjcurr, attr,
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ifaceobj.get_attr_value_first (attr),
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tunattrs.get (attr.replace ("tunnel-", "")))
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# Operations supported by this addon (yet).
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_run_ops = {
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'pre-up' : _up,
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'post-down' : _down,
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'query-checkcurr' : _query_check
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}
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def get_ops (self):
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return self._run_ops.keys()
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def _init_command_handlers (self):
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if not self.ipcmd:
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self.ipcmd = iproute2 ()
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def run (self, ifaceobj, operation, query_ifaceobj = None, **extra_args):
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op_handler = self._run_ops.get (operation)
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if not op_handler:
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return
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if operation != 'query-running' and not self._is_my_interface (ifaceobj):
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return
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self._init_command_handlers ()
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if operation == 'query-checkcurr':
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op_handler (self, ifaceobj, query_ifaceobj)
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else:
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op_handler (self, ifaceobj)
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