pvc/node-daemon/pvcd/VXNetworkInstance.py

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2018-09-23 15:26:41 -04:00
#!/usr/bin/env python3
# VXNetworkInstance.py - Class implementing a PVC VM network and run by pvcd
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# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018 Joshua M. Boniface <joshua@boniface.me>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
###############################################################################
import os
import sys
import time
from textwrap import dedent
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import pvcd.log as log
import pvcd.zkhandler as zkhandler
import pvcd.common as common
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class VXNetworkInstance(object):
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# Initialization function
def __init__ (self, vni, zk_conn, config, logger, this_node):
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self.vni = vni
self.zk_conn = zk_conn
self.config = config
self.logger = logger
self.this_node = this_node
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self.vni_dev = config['vni_dev']
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self.old_description = None
self.description = None
self.domain = None
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self.ip6_gateway = zkhandler.readdata(self.zk_conn, '/networks/{}/ip6_gateway'.format(self.vni))
self.ip6_network = zkhandler.readdata(self.zk_conn, '/networks/{}/ip6_network'.format(self.vni))
self.ip6_cidrnetmask = zkhandler.readdata(self.zk_conn, '/networks/{}/ip6_network'.format(self.vni)).split('/')[-1]
self.dhcp6_flag = ( zkhandler.readdata(self.zk_conn, '/networks/{}/dhcp6_flag'.format(self.vni)) == 'True' )
self.ip4_gateway = zkhandler.readdata(self.zk_conn, '/networks/{}/ip4_gateway'.format(self.vni))
self.ip4_network = zkhandler.readdata(self.zk_conn, '/networks/{}/ip4_network'.format(self.vni))
self.ip4_cidrnetmask = zkhandler.readdata(self.zk_conn, '/networks/{}/ip4_network'.format(self.vni)).split('/')[-1]
self.dhcp4_flag = ( zkhandler.readdata(self.zk_conn, '/networks/{}/dhcp4_flag'.format(self.vni)) == 'True' )
self.dhcp4_start = ( zkhandler.readdata(self.zk_conn, '/networks/{}/dhcp4_start'.format(self.vni)) == 'True' )
self.dhcp4_end = ( zkhandler.readdata(self.zk_conn, '/networks/{}/dhcp4_end'.format(self.vni)) == 'True' )
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self.vxlan_nic = 'vxlan{}'.format(self.vni)
self.bridge_nic = 'br{}'.format(self.vni)
self.nftables_netconf_filename = '{}/networks/{}.nft'.format(config['nft_dynamic_directory'], self.vni)
self.firewall_rules = []
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self.dhcp_server_daemon = None
self.dnsmasq_hostsdir = '{}/{}'.format(config['dnsmasq_dynamic_directory'], self.vni)
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self.dhcp_reservations = []
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# Create the network hostsdir
common.run_os_command(
'/bin/mkdir --parents {}'.format(
self.dnsmasq_hostsdir
)
)
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self.firewall_rules_base = """# Rules for network {vxlannic}
add chain inet filter {vxlannic}-in
add chain inet filter {vxlannic}-out
add rule inet filter {vxlannic}-in counter
add rule inet filter {vxlannic}-out counter
# Allow ICMP traffic into the router from network
add rule inet filter input ip protocol icmp meta iifname {bridgenic} counter accept
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add rule inet filter input ip6 nexthdr icmpv6 meta iifname {bridgenic} counter accept
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# Allow DNS, DHCP, and NTP traffic into the router from network
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add rule inet filter input tcp dport 53 meta iifname {bridgenic} counter accept
add rule inet filter input udp dport 53 meta iifname {bridgenic} counter accept
add rule inet filter input udp dport 67 meta iifname {bridgenic} counter accept
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add rule inet filter input udp dport 123 meta iifname {bridgenic} counter accept
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add rule inet filter input ip6 nexthdr udp udp dport 547 meta iifname {bridgenic} counter accept
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# Block traffic into the router from network
add rule inet filter input meta iifname {bridgenic} counter drop
""".format(
vxlannic=self.vxlan_nic,
bridgenic=self.bridge_nic
)
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self.firewall_rules_v4 = """# Jump from forward chain to this chain when matching net (IPv4)
add rule inet filter forward ip daddr {netaddr4} counter jump {vxlannic}-in
add rule inet filter forward ip saddr {netaddr4} counter jump {vxlannic}-out
""".format(
netaddr4=self.ip4_network,
vxlannic=self.vxlan_nic,
)
self.firewall_rules_v6 = """# Jump from forward chain to this chain when matching net (IPv4)
add rule inet filter forward ip6 daddr {netaddr6} counter jump {vxlannic}-in
add rule inet filter forward ip6 saddr {netaddr6} counter jump {vxlannic}-out
""".format(
netaddr6=self.ip6_network,
vxlannic=self.vxlan_nic,
)
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self.firewall_rules_in = zkhandler.listchildren(self.zk_conn, '/networks/{}/firewall_rules/in'.format(self.vni))
self.firewall_rules_out = zkhandler.listchildren(self.zk_conn, '/networks/{}/firewall_rules/out'.format(self.vni))
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# Zookeper handlers for changed states
@self.zk_conn.DataWatch('/networks/{}'.format(self.vni))
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def watch_network_description(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
if data and self.description != data.decode('ascii'):
self.old_description = self.description
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self.description = data.decode('ascii')
@self.zk_conn.DataWatch('/networks/{}/domain'.format(self.vni))
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def watch_network_domain(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
if data and self.domain != data.decode('ascii'):
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domain = data.decode('ascii')
self.domain = domain
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@self.zk_conn.DataWatch('/networks/{}/ip6_network'.format(self.vni))
def watch_network_ip6_network(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
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if data and self.ip6_network != data.decode('ascii'):
ip6_network = data.decode('ascii')
self.ip6_network = ip6_network
self.ip6_cidrnetmask = ip6_network.split('/')[-1]
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@self.zk_conn.DataWatch('/networks/{}/ip6_gateway'.format(self.vni))
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def watch_network_gateway(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
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if data and self.ip6_gateway != data.decode('ascii'):
orig_gateway = self.ip6_gateway
if self.this_node.router_state == 'primary':
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if orig_gateway:
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self.removeGateway6Address()
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self.ip6_gateway = data.decode('ascii')
if self.this_node.router_state == 'primary':
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self.createGateway6Address()
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if self.dhcp_server_daemon:
self.stopDHCPServer()
self.startDHCPServer()
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@self.zk_conn.DataWatch('/networks/{}/dhcp6_flag'.format(self.vni))
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def watch_network_dhcp_status(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
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if data and self.dhcp6_flag != ( data.decode('ascii') == 'True' ):
self.dhcp6_flag = ( data.decode('ascii') == 'True' )
if self.dhcp6_flag and not self.dhcp_server_daemon and self.this_node.router_state == 'primary':
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self.startDHCPServer()
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elif self.dhcp_server_daemon and not self.dhcp4_flag and self.this_node.router_state == 'primary':
self.stopDHCPServer()
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@self.zk_conn.DataWatch('/networks/{}/ip4_network'.format(self.vni))
def watch_network_ip4_network(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
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if data and self.ip4_network != data.decode('ascii'):
ip4_network = data.decode('ascii')
self.ip4_network = ip4_network
self.ip4_cidrnetmask = ip4_network.split('/')[-1]
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@self.zk_conn.DataWatch('/networks/{}/ip4_gateway'.format(self.vni))
def watch_network_gateway(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
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if data and self.ip4_gateway != data.decode('ascii'):
orig_gateway = self.ip4_gateway
if self.this_node.router_state == 'primary':
if orig_gateway:
self.removeGateway4Address()
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self.ip4_gateway = data.decode('ascii')
if self.this_node.router_state == 'primary':
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self.createGateway4Address()
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if self.dhcp_server_daemon:
self.stopDHCPServer()
self.startDHCPServer()
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@self.zk_conn.DataWatch('/networks/{}/dhcp4_flag'.format(self.vni))
def watch_network_dhcp_status(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
if data and self.dhcp4_flag != ( data.decode('ascii') == 'True' ):
self.dhcp4_flag = ( data.decode('ascii') == 'True' )
if self.dhcp4_flag and not self.dhcp_server_daemon and self.this_node.router_state == 'primary':
self.startDHCPServer()
elif self.dhcp_server_daemon and not self.dhcp6_flag and self.this_node.router_state == 'primary':
self.stopDHCPServer()
@self.zk_conn.DataWatch('/networks/{}/dhcp4_start'.format(self.vni))
def watch_network_dhcp4_start(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
if data and self.dhcp4_start != data.decode('ascii'):
self.dhcp4_start = data.decode('ascii')
@self.zk_conn.DataWatch('/networks/{}/dhcp4_end'.format(self.vni))
def watch_network_dhcp4_end(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
if data and self.dhcp4_end != data.decode('ascii'):
self.dhcp4_end = data.decode('ascii')
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@self.zk_conn.ChildrenWatch('/networks/{}/dhcp_reservations'.format(self.vni))
def watch_network_dhcp_reservations(new_reservations, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
if self.dhcp_reservations != new_reservations:
old_reservations = self.dhcp_reservations
self.dhcp_reservations = new_reservations
if self.this_node.router_state == 'primary':
self.updateDHCPReservations(old_reservations, new_reservations)
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@self.zk_conn.ChildrenWatch('/networks/{}/firewall_rules/in'.format(self.vni))
def watch_network_firewall_rules(new_rules, event=''):
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if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
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# Don't run on the first pass
if self.firewall_rules_in != new_rules:
self.firewall_rules_in = new_rules
self.updateFirewallRules()
@self.zk_conn.ChildrenWatch('/networks/{}/firewall_rules/out'.format(self.vni))
def watch_network_firewall_rules(new_rules, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
# Don't run on the first pass
if self.firewall_rules_out != new_rules:
self.firewall_rules_out = new_rules
self.updateFirewallRules()
self.createNetwork()
self.createFirewall()
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def getvni(self):
return self.vni
def updateDHCPReservations(self, old_reservations_list, new_reservations_list):
for reservation in new_reservations_list:
if reservation not in old_reservations_list:
# Add new reservation file
filename = '{}/{}'.format(self.dnsmasq_hostsdir, reservation)
ipaddr = zkhandler.readdata(
self.zk_conn,
'/networks/{}/dhcp_reservations/{}/ipaddr'.format(
self.vni,
reservation
)
)
entry = '{},{}'.format(reservation, ipaddr)
# Write the entry
with open(filename, 'w') as outfile:
outfile.write(entry)
for reservation in old_reservations_list:
if reservation not in new_reservations_list:
# Remove old reservation file
filename = '{}/{}'.format(self.dnsmasq_hostsdir, reservation)
try:
os.remove(filename)
self.dhcp_server_daemon.signal('hup')
except:
pass
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def updateFirewallRules(self):
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if not self.ip4_network:
return
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self.logger.out(
'Updating firewall rules',
prefix='VNI {}'.format(self.vni),
state='o'
)
ordered_acls_in = {}
ordered_acls_out = {}
sorted_acl_list = {'in': [], 'out': []}
full_ordered_rules = []
for acl in self.firewall_rules_in:
order = zkhandler.readdata(self.zk_conn, '/networks/{}/firewall_rules/in/{}/order'.format(self.vni, acl))
ordered_acls_in[order] = acl
for acl in self.firewall_rules_out:
order = zkhandler.readdata(self.zk_conn, '/networks/{}/firewall_rules/out/{}/order'.format(self.vni, acl))
ordered_acls_out[order] = acl
for order in sorted(ordered_acls_in.keys()):
sorted_acl_list['in'].append(ordered_acls_in[order])
for order in sorted(ordered_acls_out.keys()):
sorted_acl_list['out'].append(ordered_acls_out[order])
for direction in 'in', 'out':
for acl in sorted_acl_list[direction]:
rule_prefix = "add rule inet filter vxlan{}-{} counter".format(self.vni, direction)
rule_data = zkhandler.readdata(self.zk_conn, '/networks/{}/firewall_rules/{}/{}/rule'.format(self.vni, direction, acl))
rule = '{} {}'.format(rule_prefix, rule_data)
full_ordered_rules.append(rule)
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firewall_rules = self.firewall_rules_base
if self.ip6_gateway != 'None':
firewall_rules += self.firewall_rules_v6
if self.ip4_gateway != 'None':
firewall_rules += self.firewall_rules_v4
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output = "{}\n# User rules\n{}\n".format(
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firewall_rules,
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'\n'.join(full_ordered_rules)
)
with open(self.nftables_netconf_filename, 'w') as nfnetfile:
nfnetfile.write(dedent(output))
# Reload firewall rules
nftables_base_filename = '{}/base.nft'.format(self.config['nft_dynamic_directory'])
common.reload_firewall_rules(self.logger, nftables_base_filename)
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def createNetwork(self):
self.logger.out(
'Creating VXLAN device on interface {}'.format(
self.vni_dev
),
prefix='VNI {}'.format(self.vni),
state='o'
)
common.run_os_command(
'ip link add {} type vxlan id {} dstport 4789 dev {}'.format(
self.vxlan_nic,
self.vni,
self.vni_dev
)
)
common.run_os_command(
'brctl addbr {}'.format(
self.bridge_nic
)
)
common.run_os_command(
'brctl addif {} {}'.format(
self.bridge_nic,
self.vxlan_nic
)
)
common.run_os_command(
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'ip link set {} mtu 8800 up'.format(
self.vxlan_nic
)
)
common.run_os_command(
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'ip link set {} mtu 8800 up'.format(
self.bridge_nic
)
)
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common.run_os_command(
# Disable IPv6 DAD on bridge NICs
'sysctl net.ipv6.conf.{}.accept_dad=0'.format(
self.bridge_nic
)
)
def createFirewall(self):
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# For future use
self.updateFirewallRules()
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def createGateways(self):
if self.ip6_gateway != 'None':
self.createGateway6Address()
if self.ip4_gateway != 'None':
self.createGateway4Address()
def createGateway6Address(self):
if self.this_node.router_state == 'primary':
self.logger.out(
'Creating gateway {}/{} on interface {}'.format(
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self.ip6_gateway,
self.ip6_cidrnetmask,
self.bridge_nic
),
prefix='VNI {}'.format(self.vni),
state='o'
)
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common.createIPAddress(self.ip6_gateway, self.ip6_cidrnetmask, self.bridge_nic)
def createGateway4Address(self):
if self.this_node.router_state == 'primary':
self.logger.out(
'Creating gateway {}/{} on interface {}'.format(
self.ip4_gateway,
self.ip4_cidrnetmask,
self.bridge_nic
),
prefix='VNI {}'.format(self.vni),
state='o'
)
common.createIPAddress(self.ip4_gateway, self.ip4_cidrnetmask, self.bridge_nic)
def startDHCPServer(self):
if self.this_node.router_state == 'primary':
self.logger.out(
'Starting dnsmasq DHCP server on interface {}'.format(
self.bridge_nic
),
prefix='VNI {}'.format(self.vni),
state='o'
)
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# Recreate the environment we need for dnsmasq
pvcd_config_file = os.environ['PVCD_CONFIG_FILE']
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dhcp_environment = {
'DNSMASQ_BRIDGE_INTERFACE': self.bridge_nic,
'PVCD_CONFIG_FILE': pvcd_config_file
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}
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# Define the dnsmasq config fragments
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dhcp_configuration_base = [
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'--domain-needed',
'--bogus-priv',
'--no-hosts',
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'--dhcp-authoritative',
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'--filterwin2k',
'--expand-hosts',
'--domain-needed',
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'--domain={}'.format(self.domain),
'--local=/{}/'.format(self.domain),
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'--auth-zone={}'.format(self.domain),
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'--log-facility=-',
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'--log-dhcp',
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'--keep-in-foreground',
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'--leasefile-ro',
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# '--auth-soa=1,pvc@localhost,10,10',
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'--dhcp-script={}/pvcd/dnsmasq-zookeeper-leases.py'.format(os.getcwd()),
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'--dhcp-hostsdir={}'.format(self.dnsmasq_hostsdir),
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'--bind-interfaces',
'--interface={}'.format(self.bridge_nic),
'--except-interface=lo',
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]
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dhcp_configuration_v4 = [
'--listen-address={}'.format(self.ip4_gateway),
'--auth-peer={}'.format(self.ip4_gateway),
'--auth-sec-servers={}'.format(self.ip4_gateway),
'--dhcp-option=option:ntp-server,{}'.format(self.ip4_gateway),
'--dhcp-range={},{},48h'.format(self.dhcp4_start, self.dhcp4_end),
]
dhcp_configuration_v6 = [
'--listen-address={}'.format(self.ip6_gateway),
'--auth-peer={}'.format(self.ip6_gateway),
'--auth-sec-servers={}'.format(self.ip6_gateway),
'--dhcp-option=option6:dns-server,[{}]'.format(self.ip6_gateway),
'--dhcp-option=option6:sntp-server,[{}]'.format(self.ip6_gateway),
'--enable-ra',
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]
dhcp_configuration_v6_dualstack = [
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'--dhcp-range=net:{nic},::,constructor:{nic},ra-stateless,ra-names'.format(nic=self.bridge_nic),
]
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dhcp_configuration_v6_only = [
'--dhcp-range=net:{nic},::2,::ffff:ffff:ffff:ffff,constructor:{nic},64,24h'.format(nic=self.bridge_nic),
]
# Assemble the DHCP configuration
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dhcp_configuration = dhcp_configuration_base
if self.dhcp4_flag:
dhcp_configuration += dhcp_configuration_v4
if self.dhcp6_flag:
dhcp_configuration += dhcp_configuration_v6
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if self.dhcp4_flag:
dhcp_configuration += dhcp_configuration_v6_dualstack
else:
dhcp_configuration += dhcp_configuration_v6_only
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# Start the dnsmasq process in a thread
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print('/usr/sbin/dnsmasq {}'.format(' '.join(dhcp_configuration)))
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self.dhcp_server_daemon = common.run_os_daemon(
'/usr/sbin/dnsmasq {}'.format(
' '.join(dhcp_configuration)
),
environment=dhcp_environment,
logfile='{}/dnsmasq-{}.log'.format(self.config['dnsmasq_log_directory'], self.vni)
)
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def removeNetwork(self):
self.logger.out(
'Removing VNI device on interface {}'.format(
self.vni_dev
),
prefix='VNI {}'.format(self.vni),
state='o'
)
common.run_os_command(
'ip link set {} down'.format(
self.bridge_nic
)
)
common.run_os_command(
'ip link set {} down'.format(
self.vxlan_nic
)
)
common.run_os_command(
'brctl delif {} {}'.format(
self.bridge_nic,
self.vxlan_nic
)
)
common.run_os_command(
'brctl delbr {}'.format(
self.bridge_nic
)
)
common.run_os_command(
'ip link delete {}'.format(
self.vxlan_nic
)
)
def removeFirewall(self):
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self.logger.out(
'Removing firewall rules',
prefix='VNI {}'.format(self.vni),
state='o'
)
try:
os.remove(self.nftables_netconf_filename)
except:
pass
# Reload firewall rules
nftables_base_filename = '{}/base.nft'.format(self.config['nft_dynamic_directory'])
common.reload_firewall_rules(self.logger, nftables_base_filename)
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def removeGateways(self):
if self.ip6_gateway != 'None':
self.removeGateway6Address()
if self.ip4_gateway != 'None':
self.removeGateway4Address()
def removeGateway6Address(self):
self.logger.out(
'Removing gateway {}/{} from interface {}'.format(
self.ip6_gateway,
self.ip6_cidrnetmask,
self.bridge_nic
),
prefix='VNI {}'.format(self.vni),
state='o'
)
common.removeIPAddress(self.ip6_gateway, self.ip6_cidrnetmask, self.bridge_nic)
def removeGateway4Address(self):
self.logger.out(
'Removing gateway {}/{} from interface {}'.format(
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self.ip4_gateway,
self.ip4_cidrnetmask,
self.bridge_nic
),
prefix='VNI {}'.format(self.vni),
state='o'
)
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common.removeIPAddress(self.ip4_gateway, self.ip4_cidrnetmask, self.bridge_nic)
def stopDHCPServer(self):
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if self.dhcp_server_daemon:
self.logger.out(
'Stopping dnsmasq DHCP server on interface {}'.format(
self.bridge_nic
),
prefix='VNI {}'.format(self.vni),
state='o'
)
# Terminate, then kill
self.dhcp_server_daemon.signal('term')
time.sleep(0.2)
self.dhcp_server_daemon.signal('kill')
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self.dhcp_server_daemon = None