#!/usr/bin/env python3 # # Copyright 2014-2017 Cumulus Networks, Inc. All rights reserved. # Author: Roopa Prabhu, roopa@cumulusnetworks.com # import re import os import fcntl import atexit import signal try: from ifupdown2.lib.addon import Addon import ifupdown2.ifupdown.policymanager as policymanager import ifupdown2.ifupdown.ifupdownflags as ifupdownflags from ifupdown2.ifupdown.statemanager import statemanager_api as statemanager from ifupdown2.ifupdown.iface import * from ifupdown2.ifupdown.utils import utils from ifupdown2.nlmanager.nlmanager import Link from ifupdown2.ifupdownaddons.dhclient import dhclient from ifupdown2.ifupdownaddons.utilsbase import * from ifupdown2.ifupdownaddons.modulebase import moduleBase except (ImportError, ModuleNotFoundError): from lib.addon import Addon import ifupdown.policymanager as policymanager import ifupdown.ifupdownflags as ifupdownflags from ifupdown.statemanager import statemanager_api as statemanager from ifupdown.iface import * from ifupdown.utils import utils from nlmanager.nlmanager import Link from ifupdownaddons.dhclient import dhclient from ifupdownaddons.utilsbase import * from ifupdownaddons.modulebase import moduleBase class vrfPrivFlags: PROCESSED = 0x1 class vrf(Addon, moduleBase): """ ifupdown2 addon module to configure vrfs """ _modinfo = { "mhelp": "vrf configuration module", "attrs": { "vrf-table": { "help": "vrf device routing table id. key to creating a vrf device. " "Table id is either 'auto' or 'valid routing table id'", "validvals": ["auto", ""], "example": ["vrf-table auto", "vrf-table 1001"] }, "vrf": { "help": "vrf the interface is part of", "validvals": [""], "example": ["vrf blue"] } } } iproute2_vrf_filename = "/etc/iproute2/rt_tables.d/ifupdown2_vrf_map.conf" iproute2_vrf_filehdr = "# This file is autogenerated by ifupdown2.\n" \ "# It contains the vrf name to table mapping.\n" \ "# Reserved table range %s %s\n" VRF_TABLE_START = 1001 VRF_TABLE_END = 5000 system_reserved_rt_tables = { "255": "local", "254": "main", "253": "default", "0": "unspec" } def __init__(self, *args, **kargs): Addon.__init__(self) moduleBase.__init__(self, *args, **kargs) self.dhclientcmd = None self.name = self.__class__.__name__ self.vrf_mgmt_devname = policymanager.policymanager_api.get_module_globals( module_name=self.__class__.__name__, attr="vrf-mgmt-devname" ) self.at_exit = False self.user_reserved_vrf_table = [] if (ifupdownflags.flags.PERFMODE and not (self.vrf_mgmt_devname and os.path.exists('/sys/class/net/%s' %self.vrf_mgmt_devname))): # if perf mode is set (PERFMODE is set at boot), and this is the first # time we are calling ifup at boot (check for mgmt vrf existance at # boot, make sure this is really the first invocation at boot. # ifup is called with PERFMODE at boot multiple times (once for mgmt vrf # and the second time with all auto interfaces). We want to delete # the map file only the first time. This is to avoid accidently # deleting map file with a valid mgmt vrf entry if os.path.exists(self.iproute2_vrf_filename): try: self.logger.info('vrf: removing file %s' %self.iproute2_vrf_filename) os.remove(self.iproute2_vrf_filename) except Exception as e: self.logger.debug('vrf: removing file failed (%s)' %str(e)) try: ip_rules = utils.exec_command('%s rule show' %utils.ip_cmd).splitlines() self.ip_rule_cache = [' '.join(r.split()) for r in ip_rules] except Exception as e: self.ip_rule_cache = [] self.logger.warning('vrf: cache v4: %s' % str(e)) try: ip_rules = utils.exec_command('%s -6 rule show' %utils.ip_cmd).splitlines() self.ip6_rule_cache = [' '.join(r.split()) for r in ip_rules] except Exception as e: self.ip6_rule_cache = [] self.logger.warning('vrf: cache v6: %s' % str(e)) #self.logger.debug("vrf: ip rule cache") #self.logger.info(self.ip_rule_cache) #self.logger.info("vrf: ip -6 rule cache") #self.logger.info(self.ip6_rule_cache) self.l3mdev_checked = False self.l3mdev4_rule = False if self._l3mdev_rule(self.ip_rule_cache): self.l3mdev4_rule = True self.l3mdev_checked = True self.l3mdev6_rule = False if self._l3mdev_rule(self.ip6_rule_cache): self.l3mdev6_rule = True self.l3mdev_checked = True self._iproute2_vrf_map_initialized = False self.iproute2_vrf_map = {} self.iproute2_vrf_map_sync_to_disk = False self.vrf_table_id_start = policymanager.policymanager_api.get_module_globals(module_name=self.__class__.__name__, attr='vrf-table-id-start') if not self.vrf_table_id_start: self.vrf_table_id_start = self.VRF_TABLE_START self.vrf_table_id_end = policymanager.policymanager_api.get_module_globals(module_name=self.__class__.__name__, attr='vrf-table-id-end') if not self.vrf_table_id_end: self.vrf_table_id_end = self.VRF_TABLE_END self._modinfo['attrs']['vrf-table']['validrange'] = [ str(self.vrf_table_id_start), str(self.vrf_table_id_end) ] self.vrf_max_count = policymanager.policymanager_api.get_module_globals(module_name=self.__class__.__name__, attr='vrf-max-count') self.vrf_fix_local_table = True self.vrf_count = 0 self.vrf_helper = policymanager.policymanager_api.get_module_globals(module_name=self.__class__.__name__, attr='vrf-helper') self.vrf_close_socks_on_down = policymanager.policymanager_api.get_module_globals(module_name=self.__class__.__name__, attr='vrf-close-socks-on-down') self.warn_on_vrf_map_write_err = True def _check_vrf_table_id(self, ifaceobj): vrf_table = ifaceobj.get_attr_value_first('vrf-table') if not vrf_table: return False if (vrf_table != 'auto' and (int(vrf_table) < self.vrf_table_id_start or int(vrf_table) > self.vrf_table_id_end)): self.logger.error('%s: vrf table id %s out of reserved range [%d,%d]' %(ifaceobj.name, vrf_table, self.vrf_table_id_start, self.vrf_table_id_end)) return False return True def syntax_check(self, ifaceobj, ifaceobj_getfunc): if ifaceobj.link_kind & ifaceLinkKind.VRF: try: check_vrf_table_id = self._check_vrf_table_id(ifaceobj) check_vrf_sys_names = self._check_vrf_system_reserved_names(ifaceobj) return check_vrf_table_id and check_vrf_sys_names except Exception as e: self.logger.error('%s: %s' % (ifaceobj.name, str(e))) return False return True def _check_vrf_system_reserved_names(self, ifaceobj): system_reserved_names = list(self.system_reserved_rt_tables.values()) if ifaceobj.name in system_reserved_names: self.log_error('cannot use system reserved %s vrf names' % (str(system_reserved_names)), ifaceobj) return False return True def _iproute2_vrf_map_initialize(self, writetodisk=True): if self._iproute2_vrf_map_initialized: return # XXX: check for vrf reserved overlap in /etc/iproute2/rt_tables self.iproute2_vrf_map = {} iproute2_vrf_map_force_rewrite = False # read or create /etc/iproute2/rt_tables.d/ifupdown2.vrf_map if os.path.exists(self.iproute2_vrf_filename): with open(self.iproute2_vrf_filename, "r+" if writetodisk else "r") as vrf_map_fd: lines = vrf_map_fd.readlines() for l in lines: l = l.strip() if l[0] == '#': continue try: (table, vrf_name) = l.strip().split() if self.iproute2_vrf_map.get(int(table)): # looks like the existing file has # duplicate entries, force rewrite of the # file iproute2_vrf_map_force_rewrite = True continue self.iproute2_vrf_map[int(table)] = vrf_name except Exception as e: self.logger.info('vrf: iproute2_vrf_map: unable to parse %s (%s)' %(l, str(e))) pass running_vrf_map = self.cache.get_vrf_table_map() if (not running_vrf_map or (running_vrf_map != self.iproute2_vrf_map)): self.iproute2_vrf_map = running_vrf_map iproute2_vrf_map_force_rewrite = True if writetodisk: if iproute2_vrf_map_force_rewrite: # reopen the file and rewrite the map self._iproute2_vrf_map_open(True, False) else: self._iproute2_vrf_map_open(False, True) self.iproute2_vrf_map_sync_to_disk = False self.at_exit = True #atexit.register(self._iproute2_vrf_map_sync_to_disk) self.logger.info("vrf: dumping iproute2_vrf_map") self.logger.info(self.iproute2_vrf_map) last_used_vrf_table = None for t in range(self.vrf_table_id_start, self.vrf_table_id_end): if not self.iproute2_vrf_map.get(t): break last_used_vrf_table = t self.last_used_vrf_table = last_used_vrf_table self._iproute2_vrf_map_initialized = True self.vrf_count = len(self.iproute2_vrf_map) def _iproute2_map_warn(self, errstr): if self.warn_on_vrf_map_write_err: if not os.path.exists('/etc/iproute2/rt_tables.d/'): self.logger.info('unable to save iproute2 vrf to table ' + 'map (%s)\n' %errstr) self.logger.info('cannot find /etc/iproute2/rt_tables.d.' + ' pls check if your iproute2 version' + ' supports rt_tables.d') else: self.logger.warning('unable to open iproute2 vrf to table ' + 'map (%s)\n' %errstr) self.warn_on_vrf_map_write_err = False def _iproute2_vrf_map_sync_to_disk(self): if (ifupdownflags.flags.DRYRUN or not self.iproute2_vrf_map_sync_to_disk): return self.logger.info('vrf: syncing table map to %s' %self.iproute2_vrf_filename) try: with open(self.iproute2_vrf_filename, 'w') as f: f.write(self.iproute2_vrf_filehdr %(self.vrf_table_id_start, self.vrf_table_id_end)) for t, v in self.iproute2_vrf_map.items(): f.write('%s %s\n' %(t, v)) f.flush() except Exception as e: self._iproute2_map_warn(str(e)) pass def _iproute2_vrf_map_open(self, sync_vrfs=False, append=False): self.logger.info('vrf: syncing table map to %s' %self.iproute2_vrf_filename) if ifupdownflags.flags.DRYRUN: return fmode = 'a+' if append else 'w' if not append: # write file header with open(self.iproute2_vrf_filename, fmode) as vrf_map_fd: vrf_map_fd.write(self.iproute2_vrf_filehdr %(self.vrf_table_id_start, self.vrf_table_id_end)) for t, v in self.iproute2_vrf_map.items(): vrf_map_fd.write('%s %s\n' %(t, v)) vrf_map_fd.flush() def _is_vrf(self, ifaceobj): if ifaceobj.get_attr_value_first('vrf-table'): return True return False def get_upper_ifacenames(self, ifaceobj, ifacenames_all=None): """ Returns list of interfaces dependent on ifaceobj """ vrf_table = ifaceobj.get_attr_value_first('vrf-table') if vrf_table: ifaceobj.link_type = ifaceLinkType.LINK_MASTER ifaceobj.link_kind |= ifaceLinkKind.VRF ifaceobj.role |= ifaceRole.MASTER if vrf_table != 'auto': # if the user didn't specify auto we need to store the desired # vrf tables ids, in case the configuration has both auto and # hardcoded vrf-table ids. We need to create them all without # collisions. self.user_reserved_vrf_table.append(int(vrf_table)) vrf_iface_name = ifaceobj.get_attr_value_first('vrf') if not vrf_iface_name: return None ifaceobj.link_type = ifaceLinkType.LINK_SLAVE ifaceobj.link_privflags |= ifaceLinkPrivFlags.VRF_SLAVE return [vrf_iface_name] def get_upper_ifacenames_running(self, ifaceobj): return None def _get_iproute2_vrf_table(self, vrf_dev_name): for t, v in self.iproute2_vrf_map.items(): if v == vrf_dev_name: return str(t) return None def _get_avail_vrf_table_id(self): if self.last_used_vrf_table == None: table_id_start = self.vrf_table_id_start else: table_id_start = self.last_used_vrf_table + 1 for t in range(table_id_start, self.vrf_table_id_end): if (not self.iproute2_vrf_map.get(t) and t not in self.user_reserved_vrf_table): self.last_used_vrf_table = t return str(t) return None def _iproute2_is_vrf_tableid_inuse(self, vrfifaceobj, table_id): old_vrf_name = self.iproute2_vrf_map.get(int(table_id)) if old_vrf_name and old_vrf_name != vrfifaceobj.name: self.log_error('table id %s already assigned to vrf dev %s' %(table_id, old_vrf_name), vrfifaceobj) def _iproute2_vrf_table_entry_add(self, vrfifaceobj, table_id): old_vrf_name = self.iproute2_vrf_map.get(int(table_id)) if not old_vrf_name: self.iproute2_vrf_map[int(table_id)] = vrfifaceobj.name with open(self.iproute2_vrf_filename, "a+") as vrf_map_fd: vrf_map_fd.write('%s %s\n' % (table_id, vrfifaceobj.name)) vrf_map_fd.flush() self.vrf_count += 1 return if old_vrf_name != vrfifaceobj.name: self.log_error('table id %d already assigned to vrf dev %s' %(table_id, old_vrf_name)) def _iproute2_vrf_table_entry_del(self, table_id): try: # with any del of vrf map, we need to force sync to disk self.iproute2_vrf_map_sync_to_disk = True del self.iproute2_vrf_map[int(table_id)] except Exception as e: self.logger.info('vrf: iproute2 vrf map del failed for %s (%s)' %(table_id, str(e))) pass def _is_vrf_dev(self, ifacename): # Look at iproute2 map for now. # If it was a master we knew about, # it is definately there if ifacename in list(self.iproute2_vrf_map.values()): return True return False def _is_dhcp_slave(self, ifaceobj): if (not ifaceobj.addr_method or (ifaceobj.addr_method != 'dhcp' and ifaceobj.addr_method != 'dhcp6')): return False return True def _up_vrf_slave_without_master(self, ifacename, vrfname, ifaceobj, vrf_master_objs, ifaceobj_getfunc=None): """ If we have a vrf slave that has dhcp configured, bring up the vrf master now. This is needed because vrf has special handling in dhclient hook which requires the vrf master to be present """ vrf_master = None if len(ifaceobj.upperifaces) > 1 and ifaceobj_getfunc: for upper_iface in ifaceobj.upperifaces: upper_ifaceobjs = ifaceobj_getfunc(upper_iface) if upper_ifaceobjs: for upper_obj in upper_ifaceobjs: if upper_obj.link_kind & ifaceLinkKind.VRF: vrf_master = upper_obj.name break elif ifaceobj.upperifaces: vrf_master = ifaceobj.upperifaces[0] if not vrf_master: self.logger.warning('%s: vrf master not found' %ifacename) return if os.path.exists('/sys/class/net/%s' %vrf_master): self.logger.info('%s: vrf master %s exists returning' %(ifacename, vrf_master)) return self.logger.info('%s: bringing up vrf master %s' %(ifacename, vrf_master)) for mobj in vrf_master_objs: vrf_table = mobj.get_attr_value_first('vrf-table') if vrf_table: if vrf_table == 'auto': vrf_table = self._get_avail_vrf_table_id() if not vrf_table: self.log_error('%s: unable to get an auto table id' %mobj.name, ifaceobj) self.logger.info('%s: table id auto: selected table id %s\n' %(mobj.name, vrf_table)) try: self._up_vrf_dev(mobj, vrf_table, False) except Exception: raise break self._handle_existing_connections(ifaceobj, vrfname) self.enable_ipv6_if_prev_brport(ifacename) self.netlink.link_set_master(ifacename, vrfname) return def enable_ipv6_if_prev_brport(self, ifname): """ If the intf was previously enslaved to a bridge it is possible ipv6 is still disabled. """ try: for ifaceobj in statemanager.get_ifaceobjs(ifname) or []: if ifaceobj.link_privflags & ifaceLinkPrivFlags.BRIDGE_PORT: self.write_file("/proc/sys/net/ipv6/conf/%s/disable_ipv6" % ifname, "0") return except Exception as e: self.logger.info(str(e)) def _down_dhcp_slave(self, ifaceobj, vrfname): try: dhclient_cmd_prefix = None if (vrfname and self.vrf_exec_cmd_prefix and self.cache.link_exists(vrfname)): dhclient_cmd_prefix = '%s %s' %(self.vrf_exec_cmd_prefix, vrfname) self.dhclientcmd.release(ifaceobj.name, dhclient_cmd_prefix) except Exception: # ignore any dhclient release errors pass def _handle_existing_connections(self, ifaceobj, vrfname): if not ifaceobj or ifupdownflags.flags.PERFMODE: return # XXX: re-evaluate kill_ssh_sessions if (self.vrf_mgmt_devname and self.vrf_mgmt_devname == vrfname): self._kill_ssh_connections(ifaceobj.name, ifaceobj) self._close_sockets(ifaceobj.name) if self._is_dhcp_slave(ifaceobj): self._down_dhcp_slave(ifaceobj, vrfname) def _up_vrf_slave(self, ifacename, vrfname, ifaceobj=None, ifaceobj_getfunc=None, vrf_exists=False): try: master_exists = True if vrf_exists or self.cache.link_exists(vrfname): uppers = self.sysfs.link_get_uppers(ifacename) if not uppers or vrfname not in uppers: self._handle_existing_connections(ifaceobj, vrfname) self.enable_ipv6_if_prev_brport(ifacename) self.netlink.link_set_master(ifacename, vrfname) elif ifaceobj: vrf_master_objs = ifaceobj_getfunc(vrfname) if not vrf_master_objs: # this is the case where vrf is assigned to an interface # but user has not provided a vrf interface. # people expect you to warn them but go ahead with the # rest of the config on that interface self.netlink.link_up(ifacename) self.log_error('vrf master ifaceobj %s not found' %vrfname) return if (ifupdownflags.flags.ALL or ifupdownflags.flags.WITH_DEPENDS or (ifupdownflags.flags.CLASS and ifaceobj.classes and vrf_master_objs[0].classes and set(ifaceobj.classes).intersection(vrf_master_objs[0].classes))): self._up_vrf_slave_without_master(ifacename, vrfname, ifaceobj, vrf_master_objs, ifaceobj_getfunc) else: master_exists = False else: master_exists = False if master_exists: if not ifaceobj.link_privflags & ifaceLinkPrivFlags.KEEP_LINK_DOWN and not self.check_link_down_on_vlan_lower_dev( ifaceobj, ifaceobj_getfunc ): self.netlink.link_up(ifacename) else: self.log_error('vrf %s not around, skipping vrf config' %(vrfname), ifaceobj) except Exception as e: self.log_error('%s: %s' %(ifacename, str(e)), ifaceobj) def check_link_down_on_vlan_lower_dev(self, ifaceobj, ifaceobj_getfunc): if ifaceobj.link_kind & ifaceLinkKind.VLAN: for obj in ifaceobj_getfunc(ifaceobj.lowerifaces[0]): if obj.link_privflags & ifaceLinkPrivFlags.KEEP_LINK_DOWN: self.logger.info("%s: keeping vlan down (lower device %s has link-down flag set)" % (ifaceobj.name, obj.name)) return True return False def _del_vrf_rules(self, vrf_dev_name, vrf_table): pref = 200 ip_rule_out_format = '%s: from all %s %s lookup %s' ip_rule_cmd = '%s %s rule del pref %s %s %s table %s' rule = ip_rule_out_format %(pref, 'oif', vrf_dev_name, vrf_dev_name) if rule in self.ip_rule_cache: rule_cmd = ip_rule_cmd %(utils.ip_cmd, '', pref, 'oif', vrf_dev_name, vrf_dev_name) utils.exec_command(rule_cmd) rule = ip_rule_out_format %(pref, 'iif', vrf_dev_name, vrf_dev_name) if rule in self.ip_rule_cache: rule_cmd = ip_rule_cmd %(utils.ip_cmd, '', pref, 'iif', vrf_dev_name, vrf_dev_name) utils.exec_command(rule_cmd) rule = ip_rule_out_format %(pref, 'oif', vrf_dev_name, vrf_dev_name) if rule in self.ip6_rule_cache: rule_cmd = ip_rule_cmd %(utils.ip_cmd, '-6', pref, 'oif', vrf_dev_name, vrf_dev_name) utils.exec_command(rule_cmd) rule = ip_rule_out_format %(pref, 'iif', vrf_dev_name, vrf_dev_name) if rule in self.ip6_rule_cache: rule_cmd = ip_rule_cmd %(utils.ip_cmd, '-6', pref, 'iif', vrf_dev_name, vrf_dev_name) utils.exec_command(rule_cmd) def _l3mdev_rule(self, ip_rules): for rule in ip_rules: if not re.search(r"\d.*from\s+all\s+lookup\s+\W?l3mdev-table\W?", rule): continue return True return False def _rule_cache_fill(self): ip_rules = utils.exec_command('%s rule show' %utils.ip_cmd).splitlines() self.ip_rule_cache = [' '.join(r.split()) for r in ip_rules] self.l3mdev4_rule = self._l3mdev_rule(self.ip_rule_cache) ip_rules = utils.exec_command('%s -6 rule show' %utils.ip_cmd).splitlines() self.ip6_rule_cache = [' '.join(r.split()) for r in ip_rules] self.l3mdev6_rule = self._l3mdev_rule(self.ip6_rule_cache) def _add_vrf_rules(self, vrf_dev_name, vrf_table): pref = 200 ip_rule_out_format = '%s: from all %s %s lookup %s' ip_rule_cmd = '%s %s rule add pref %s %s %s table %s' if self.vrf_fix_local_table: self.vrf_fix_local_table = False rule = '0: from all lookup local' if rule in self.ip_rule_cache: try: utils.exec_command('%s rule del pref 0' %utils.ip_cmd) utils.exec_command('%s rule add pref 32765 table local' %utils.ip_cmd) except Exception as e: self.logger.info('%s: %s' % (vrf_dev_name, str(e))) pass if rule in self.ip6_rule_cache: try: utils.exec_command('%s -6 rule del pref 0' %utils.ip_cmd) utils.exec_command('%s -6 rule add pref 32765 table local' %utils.ip_cmd) except Exception as e: self.logger.info('%s: %s' % (vrf_dev_name, str(e))) pass if not self.l3mdev_checked: self._rule_cache_fill() self.l3mdev_checked = True #Example ip rule #200: from all oif blue lookup blue #200: from all iif blue lookup blue rule = ip_rule_out_format %(pref, 'oif', vrf_dev_name, vrf_dev_name) if not self.l3mdev4_rule and rule not in self.ip_rule_cache: rule_cmd = ip_rule_cmd %(utils.ip_cmd, '', pref, 'oif', vrf_dev_name, vrf_dev_name) utils.exec_command(rule_cmd) rule = ip_rule_out_format %(pref, 'iif', vrf_dev_name, vrf_dev_name) if not self.l3mdev4_rule and rule not in self.ip_rule_cache: rule_cmd = ip_rule_cmd %(utils.ip_cmd, '', pref, 'iif', vrf_dev_name, vrf_dev_name) utils.exec_command(rule_cmd) rule = ip_rule_out_format %(pref, 'oif', vrf_dev_name, vrf_dev_name) if not self.l3mdev6_rule and rule not in self.ip6_rule_cache: rule_cmd = ip_rule_cmd %(utils.ip_cmd, '-6', pref, 'oif', vrf_dev_name, vrf_dev_name) utils.exec_command(rule_cmd) rule = ip_rule_out_format %(pref, 'iif', vrf_dev_name, vrf_dev_name) if not self.l3mdev6_rule and rule not in self.ip6_rule_cache: rule_cmd = ip_rule_cmd %(utils.ip_cmd, '-6', pref, 'iif', vrf_dev_name, vrf_dev_name) utils.exec_command(rule_cmd) def _is_address_virtual_slaves(self, vrfobj, config_vrfslaves, vrfslave): # Address virtual lines on a vrf slave will create # macvlan devices on the vrf slave and enslave them # to the vrf master. This function checks if the # vrf slave is such a macvlan interface. # XXX: additional possible checks that can be done here # are: # - check if it is also a macvlan device of the # format -v created by the # address virtual module vrfslave_lowers = self.sysfs.link_get_lowers(vrfslave) if vrfslave_lowers: if vrfslave_lowers[0] in config_vrfslaves: return True return False def _add_vrf_slaves(self, ifaceobj, ifaceobj_getfunc=None): running_slaves = self.sysfs.link_get_lowers(ifaceobj.name) config_slaves = ifaceobj.lowerifaces if not config_slaves and not running_slaves: return if not config_slaves: config_slaves = [] if not running_slaves: running_slaves = [] add_slaves = set(config_slaves).difference(set(running_slaves)) del_slaves = set(running_slaves).difference(set(config_slaves)) if add_slaves: for s in add_slaves: try: if not self.cache.link_exists(s): continue sobj = None if ifaceobj_getfunc: sobj = ifaceobj_getfunc(s) self._up_vrf_slave(s, ifaceobj.name, sobj[0] if sobj else None, ifaceobj_getfunc, True) except Exception as e: self.logger.info('%s: %s' %(ifaceobj.name, str(e))) if del_slaves: for s in del_slaves: try: if self._is_address_virtual_slaves(ifaceobj, config_slaves, s): continue sobj = None if ifaceobj_getfunc: sobj = ifaceobj_getfunc(s) self._down_vrf_slave(s, sobj[0] if sobj else None, ifaceobj.name) except Exception as e: self.logger.info('%s: %s' %(ifaceobj.name, str(e))) if ifaceobj.link_type == ifaceLinkType.LINK_MASTER: for s in config_slaves: try: for slave_ifaceobj in ifaceobj_getfunc(s) or []: if slave_ifaceobj.link_privflags & ifaceLinkPrivFlags.KEEP_LINK_DOWN or self.check_link_down_on_vlan_lower_dev( slave_ifaceobj, ifaceobj_getfunc ): raise Exception("link-down yes: keeping VRF slave down") self.netlink.link_up(s) except Exception as e: self.logger.debug("%s: %s" % (s, str(e))) pass def _set_vrf_dev_processed_flag(self, ifaceobj): ifaceobj.module_flags[self.name] = \ ifaceobj.module_flags.setdefault(self.name, 0) | \ vrfPrivFlags.PROCESSED def _check_vrf_dev_processed_flag(self, ifaceobj): if (ifaceobj.module_flags.get(self.name, 0) & vrfPrivFlags.PROCESSED): return True return False def _create_vrf_dev(self, ifaceobj, vrf_table): if not self.cache.link_exists(ifaceobj.name): self._check_vrf_system_reserved_names(ifaceobj) if self.vrf_count == self.vrf_max_count: self.log_error('max vrf count %d hit...not ' 'creating vrf' % self.vrf_count, ifaceobj) if vrf_table == 'auto': vrf_table = self._get_avail_vrf_table_id() if not vrf_table: self.log_error('unable to get an auto table id', ifaceobj) self.logger.info('%s: table id auto: selected table id %s\n' %(ifaceobj.name, vrf_table)) else: self._iproute2_is_vrf_tableid_inuse(ifaceobj, vrf_table) if ifaceobj.name in list(self.system_reserved_rt_tables.keys()): self.log_error('cannot use system reserved %s table ids' %(str(list(self.system_reserved_rt_tables.keys()))), ifaceobj) if not vrf_table.isdigit(): self.log_error('vrf-table must be an integer or \'auto\'', ifaceobj) # XXX: If we decide to not allow vrf id usages out of # the reserved ifupdown range, then uncomment this code. else: if (int(vrf_table) < self.vrf_table_id_start or int(vrf_table) > self.vrf_table_id_end): self.log_error('vrf table id %s out of reserved range [%d,%d]' %(vrf_table, self.vrf_table_id_start, self.vrf_table_id_end), ifaceobj) try: self.netlink.link_add_vrf(ifaceobj.name, vrf_table) except Exception as e: self.log_error('create failed (%s)\n' % str(e), ifaceobj) if vrf_table != 'auto': self._iproute2_vrf_table_entry_add(ifaceobj, vrf_table) else: if vrf_table == 'auto': vrf_table = self._get_iproute2_vrf_table(ifaceobj.name) if not vrf_table and not ifupdownflags.flags.DRYRUN: self.log_error('unable to get vrf table id', ifaceobj) # if the device exists, check if table id is same running_table = self.cache.get_link_info_data_attribute(ifaceobj.name, Link.IFLA_VRF_TABLE) if running_table is not None and vrf_table != str(running_table): self.log_error('cannot change vrf table id,running table id' ' %s is different from config id %s' % (running_table, vrf_table), ifaceobj) return vrf_table def _up_vrf_helper(self, ifaceobj, vrf_table): mode = "" if ifupdownflags.flags.PERFMODE: mode = "boot" if self.vrf_helper: utils.exec_command('%s create %s %s %s' % (self.vrf_helper, ifaceobj.name, vrf_table, mode)) def _up_vrf_dev(self, ifaceobj, vrf_table, add_slaves=True, ifaceobj_getfunc=None): # if vrf dev is already processed return. This can happen # if we the slave was configured before. # see self._up_vrf_slave_without_master if self._check_vrf_dev_processed_flag(ifaceobj): return True try: vrf_table = self._create_vrf_dev(ifaceobj, vrf_table) except Exception as e: self.log_error('%s: %s' %(ifaceobj.name, str(e)), ifaceobj) try: self._add_vrf_rules(ifaceobj.name, vrf_table) self._up_vrf_helper(ifaceobj, vrf_table) if add_slaves: self._add_vrf_slaves(ifaceobj, ifaceobj_getfunc) self._set_vrf_dev_processed_flag(ifaceobj) if not ifaceobj.link_privflags & ifaceLinkPrivFlags.KEEP_LINK_DOWN: self.netlink.link_up(ifaceobj.name) except Exception as e: self.log_error('%s: %s' %(ifaceobj.name, str(e)), ifaceobj) def _kill_ssh_connections(self, ifacename, ifaceobj): try: iplist = [str(ip.ip) for ip in self.cache.get_managed_ip_addresses( ifname=ifacename, ifaceobj_list=[ifaceobj], )] if not iplist: return proc=[] #Example output: #ESTAB 0 0 10.0.1.84:ssh 10.0.1.228:45186 #users:(("sshd",pid=2528,fd=3)) cmdl = [utils.ss_cmd, '-t', '-p'] for line in utils.exec_commandl(cmdl).splitlines(): citems = line.split() addr = None if '%' in citems[3]: addr = citems[3].split('%')[0] elif ':ssh' in citems[3]: addr = citems[3].split(':')[0] if not addr: continue if addr in iplist: if len(citems) == 6: proc.append(citems[5].split(',')[1].split('=')[1]) if not proc: return pid = None # outpt of '/usr/bin/pstree -Aps ': # 'systemd(1)---sshd(990)---sshd(16112)---sshd(16126)---bash(16127)---sudo(16756)---ifreload(16761)---pstree(16842)\n' # get the above output to following format # ['systemd(1)', 'sshd(990)', 'sshd(16112)', 'sshd(16126)', 'bash(16127)', 'sudo(16756)', 'ifreload(16761)', 'pstree(16850)'] pstree = list(reversed(utils.exec_command('%s -Aps %s' % (utils.pstree_cmd, os.getpid())).strip().split('---'))) for index, process in enumerate(pstree): # check the parent of SSH process to make sure # we don't kill SSH server or systemd process if 'sshd' in process and 'sshd' in pstree[index + 1]: pid = [x for x in process if x.isdigit()] break self.logger.info("%s: killing active ssh sessions: %s" %(ifacename, str(proc))) if ifupdownflags.flags.DRYRUN: return for id in proc: if id != pid: try: os.kill(int(id), signal.SIGINT) except OSError as e: continue # Kill current SSH client if pid in proc: try: forkret = os.fork() except OSError as e: self.logger.info("fork error : %s [%d]" % (e.strerror, e.errno)) if (forkret == 0): # The first child. try: os.setsid() self.logger.info("%s: ifreload continuing in the background" %ifacename) except OSError as xxx_todo_changeme: (err_no, err_message) = xxx_todo_changeme.args self.logger.info("os.setsid failed: errno=%d: %s" % (err_no, err_message)) self.logger.info("pid=%d pgid=%d" % (os.getpid(), os.getpgid(0))) try: self.logger.info("%s: killing our session: %s" %(ifacename, str(proc))) os.kill(int(pid), signal.SIGINT) return except OSError as e: return except Exception as e: self.logger.info('%s: %s' %(ifacename, str(e))) def _up(self, ifaceobj, ifaceobj_getfunc=None): try: vrf_table = ifaceobj.get_attr_value_first('vrf-table') if vrf_table: self._iproute2_vrf_map_initialize() # This is a vrf device self._up_vrf_dev(ifaceobj, vrf_table, True, ifaceobj_getfunc) else: vrf = ifaceobj.get_attr_value_first('vrf') if vrf: if not self.cache.link_exists(ifaceobj.name): self.logger.warning("%s: device not found - please check your configuration" % ifaceobj.name) return self._iproute2_vrf_map_initialize() # This is a vrf slave self._up_vrf_slave(ifaceobj.name, vrf, ifaceobj, ifaceobj_getfunc) elif not ifupdownflags.flags.PERFMODE: # check if we were a slave before master = self.cache.get_master(ifaceobj.name) if master: self._iproute2_vrf_map_initialize() if self._is_vrf_dev(master): self._down_vrf_slave(ifaceobj.name, ifaceobj, master) except Exception as e: self.log_error(str(e), ifaceobj) def _down_vrf_helper(self, ifaceobj, vrf_table): mode = "" if ifupdownflags.flags.PERFMODE: mode = "boot" if self.vrf_helper: utils.exec_command('%s delete %s %s %s' % (self.vrf_helper, ifaceobj.name, vrf_table, mode)) def _close_sockets(self, ifacename): if not self.vrf_close_socks_on_down: return try: ifindex = self.cache.get_ifindex(ifacename) except Exception as e: self.logger.debug("%s: vrf: close sockets error: %s" % str(e)) ifindex = 0 if not ifindex: return try: utils.exec_command('%s -aK \"dev == %s\"' %(utils.ss_cmd, ifindex)) except Exception as e: self.logger.info('%s: closing socks using ss' ' failed (%s)\n' %(ifacename, str(e))) pass def _down_vrf_dev(self, ifaceobj, vrf_table, ifaceobj_getfunc=None): if not self.cache.link_exists(ifaceobj.name): return if vrf_table == 'auto': vrf_table = self._get_iproute2_vrf_table(ifaceobj.name) running_slaves = self.sysfs.link_get_lowers(ifaceobj.name) if running_slaves: for s in running_slaves: if ifaceobj_getfunc: sobj = ifaceobj_getfunc(s) try: self._handle_existing_connections(sobj[0] if sobj else None, ifaceobj.name) except Exception as e: self.logger.info('%s: %s' %(ifaceobj.name, str(e))) pass try: self.netlink.addr_flush(s) self.netlink.link_down(s) except Exception as e: self.logger.info('%s: %s' %(s, str(e))) pass try: self._down_vrf_helper(ifaceobj, vrf_table) except Exception as e: self.logger.warning('%s: %s' %(ifaceobj.name, str(e))) pass try: self._del_vrf_rules(ifaceobj.name, vrf_table) except Exception as e: self.logger.info('%s: %s' %(ifaceobj.name, str(e))) pass self._close_sockets(ifaceobj.name) try: self.netlink.link_del(ifaceobj.name) except Exception as e: self.logger.info('%s: %s' %(ifaceobj.name, str(e))) pass try: self._iproute2_vrf_table_entry_del(vrf_table) except Exception as e: self.logger.info('%s: %s' %(ifaceobj.name, str(e))) pass def _down_vrf_slave(self, ifacename, ifaceobj=None, vrfname=None): try: self._handle_existing_connections(ifaceobj, vrfname) self.netlink.link_set_nomaster(ifacename) except Exception as e: self.logger.warning('%s: %s' %(ifacename, str(e))) def _down(self, ifaceobj, ifaceobj_getfunc=None): try: vrf_table = ifaceobj.get_attr_value_first('vrf-table') if vrf_table: self._iproute2_vrf_map_initialize() self._down_vrf_dev(ifaceobj, vrf_table, ifaceobj_getfunc) else: vrf = ifaceobj.get_attr_value_first('vrf') if vrf: self._iproute2_vrf_map_initialize() self._down_vrf_slave(ifaceobj.name, ifaceobj, None) except Exception as e: self.log_warn(str(e)) def _query_check_vrf_slave(self, ifaceobj, ifaceobjcurr, vrf): try: master = self.cache.get_master(ifaceobj.name) if not master or master != vrf: ifaceobjcurr.update_config_with_status('vrf', str(master), 1) else: ifaceobjcurr.update_config_with_status('vrf', master, 0) except Exception as e: self.log_error(str(e), ifaceobjcurr) def _query_check_vrf_dev(self, ifaceobj, ifaceobjcurr, vrf_table): try: if not self.cache.link_exists(ifaceobj.name): self.logger.info('%s: vrf: does not exist' %(ifaceobj.name)) return if vrf_table == 'auto': config_table = str(self._get_iproute2_vrf_table(ifaceobj.name) or 0) else: config_table = vrf_table running_vrf_table = str(self.cache.get_link_info_data_attribute(ifaceobj.name, Link.IFLA_VRF_TABLE)) ifaceobjcurr.update_config_with_status('vrf-table', running_vrf_table, config_table != running_vrf_table) if not ifupdownflags.flags.WITHDEFAULTS: return if self.vrf_helper: try: utils.exec_command('%s verify %s %s' %(self.vrf_helper, ifaceobj.name, config_table)) ifaceobjcurr.update_config_with_status('vrf-helper', '%s create %s %s' %(self.vrf_helper, ifaceobj.name, config_table), 0) except Exception as e: ifaceobjcurr.update_config_with_status('vrf-helper', '%s create %s %s' %(self.vrf_helper, ifaceobj.name, config_table), 1) pass except Exception as e: self.log_warn(str(e)) def _query_check(self, ifaceobj, ifaceobjcurr): try: vrf_table = ifaceobj.get_attr_value_first('vrf-table') if vrf_table: self._iproute2_vrf_map_initialize(writetodisk=False) self._query_check_vrf_dev(ifaceobj, ifaceobjcurr, vrf_table) else: vrf = ifaceobj.get_attr_value_first('vrf') if vrf: self._iproute2_vrf_map_initialize(writetodisk=False) self._query_check_vrf_slave(ifaceobj, ifaceobjcurr, vrf) except Exception as e: self.log_warn(str(e)) def _query_running(self, ifaceobjrunning, ifaceobj_getfunc=None): try: kind = self.cache.get_link_kind(ifaceobjrunning.name) if kind == 'vrf': running_table = self.cache.get_link_info_data_attribute(ifaceobjrunning.name, Link.IFLA_VRF_TABLE) if running_table is not None: ifaceobjrunning.update_config('vrf-table', str(running_table)) return slave_kind = self.cache.get_link_slave_kind(ifaceobjrunning.name) if slave_kind == 'vrf_slave': vrf = self.cache.get_master(ifaceobjrunning.name) if vrf: ifaceobjrunning.update_config('vrf', vrf) except Exception as e: self.log_warn(str(e)) def _query(self, ifaceobj, **kwargs): if not self.vrf_helper: return if (ifaceobj.link_kind & ifaceLinkKind.VRF): ifaceobj.update_config('vrf-helper', '%s %s' %(self.vrf_helper, ifaceobj.name)) _run_ops = { "pre-up": _up, "post-down": _down, "query-running": _query_running, "query-checkcurr": _query_check, "query": _query } def get_ops(self): """ returns list of ops supported by this module """ return list(self._run_ops.keys()) def _init_command_handlers(self): if not self.dhclientcmd: self.dhclientcmd = dhclient() def run(self, ifaceobj, operation, query_ifaceobj=None, ifaceobj_getfunc=None, **extra_args): """ run bond configuration on the interface object passed as argument Args: **ifaceobj** (object): iface object **operation** (str): any of 'pre-up', 'post-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. """ 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) else: op_handler(self, ifaceobj, ifaceobj_getfunc=ifaceobj_getfunc) if self.at_exit: self._iproute2_vrf_map_sync_to_disk() self.at_exit = False