add netns support

17888275 · Bach Dániel · d59f5827 · 17888275 · 17888275 · 17888275
Commit 17888275 authored Dec 24, 2013 by Bach Dániel
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Showing with 76 additions and 69 deletions

fw.py
+31 -52

ovs.py
+21 -17

utils.py
+24 -0

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--- a/fw.py
+++ b/fw.py
 from celery import Celery, task
 from os import getenv
-import subprocess
 import re
 import json
-import socket
 from ovs import Switch
 IRC_CHANNEL = getenv('IRC_CHANNEL', '/home/cloud/irc/irc.atw.hu/#ik/in')
 DHCP_LOGFILE = getenv('DHCP_LOGFILE', '/var/log/syslog')
 VLAN_CONF = getenv('VLAN_CONF', 'vlan.conf')
 FIREWALL_CONF = getenv('FIREWALL_CONF', 'firewall.conf')
+from utils import NETNS, ns_exec
 celery = Celery('tasks', backend='amqp', )
 celery.conf.update(CELERY_TASK_RESULT_EXPIRES=300,
@@ -21,16 +19,14 @@ celery.conf.update(CELERY_TASK_RESULT_EXPIRES=300,
 @task(name="firewall.reload_firewall")
 def reload_firewall(data4, data6, onstart=False):
    print "fw"
-    process = subprocess.Popen(['/usr/bin/sudo',
-                                '/sbin/ip6tables-restore', '-c'],
+    ns_exec(NETNS, ('/sbin/ip6tables-restore', '-c'),
-                               shell=False, stdin=subprocess.PIPE)
+            '\n'.join(data6['filter']) + '\n')
-    process.communicate("\n".join(data6['filter']) + "\n")
+    ns_exec(NETNS, ('/sbin/iptables-restore', '-c'),
-    process = subprocess.Popen(['/usr/bin/sudo',
+            ('\n'.join(data4['filter']) + '\n' +
-                                '/sbin/iptables-restore', '-c'],
+             '\n'.join(data4['nat']) + '\n'))
-                               shell=False, stdin=subprocess.PIPE)
-    process.communicate("\n".join(data4['filter'])
-                        + "\n" + "\n".join(data4['nat']) + "\n")
    if onstart is False:
        with open(FIREWALL_CONF, 'w') as f:
            json.dump([data4, data6], f)
@@ -39,22 +35,24 @@ def reload_firewall(data4, data6, onstart=False):
 @task(name="firewall.reload_firewall_vlan")
 def reload_firewall_vlan(data, onstart=False):
    print "fw vlan"
-#    print data
    br = Switch('firewall')
    br.migrate(data)
-#    print br.list_ports()
    if onstart is False:
        with open(VLAN_CONF, 'w') as f:
            json.dump(data, f)
-    subprocess.call("/sbin/ip ro add default via 10.7.255.254", shell=True)
+    GATEWAY = getenv('GATEWAY', '152.66.243.254')
+    try:
+       ns_exec(NETNS, ('/sbin/ip', 'ro', 'add', 'default', 'via', GATEWAY))
+    except:
+       pass
 @task(name="firewall.reload_dhcp")
 def reload_dhcp(data):
    print "dhcp"
    with open('/tools/dhcp3/dhcpd.conf.generated', 'w') as f:
        f.write("\n".join(data) + "\n")
-    subprocess.call(['sudo', '/etc/init.d/isc-dhcp-server',
+    ns_exec(NETNS, ('/etc/init.d/isc-dhcp-server', 'restart'))
-                     'restart'], shell=False)
 def ipset_save(data):
@@ -63,9 +61,8 @@ def ipset_save(data):
    data_new = [x['ipv4'] for x in data]
    data_old = []
-    p = subprocess.Popen(['/usr/bin/sudo', '/usr/sbin/ipset', 'save',
+    lines = ns_exec(NETNS, ('/usr/sbin/ipset', 'save', 'blacklist'))
-                          'blacklist'], shell=False, stdout=subprocess.PIPE)
+    for line in lines.splitlines():
-    for line in p.stdout:
        x = r.match(line.rstrip())
        if x:
            data_old.append(x.group(1))
@@ -73,7 +70,7 @@ def ipset_save(data):
    l_add = list(set(data_new).difference(set(data_old)))
    l_del = list(set(data_old).difference(set(data_new)))
-    return (l_add, l_del, )
+    return (l_add, l_del)
 def ipset_restore(l_add, l_del):
@@ -83,29 +80,8 @@ def ipset_restore(l_add, l_del):
    ipset = ipset + ['add blacklist %s' % x for x in l_add]
    ipset = ipset + ['del blacklist %s' % x for x in l_del]
-    print "\n".join(ipset) + "\n"
+    ns_exec(NETNS, ('/usr/sbin/ipset', 'restore', '-exist'),
+            '\n'.join(ipset) + '\n')
-    p = subprocess.Popen(['/usr/bin/sudo', '/usr/sbin/ipset', 'restore',
-                          '-exist'], shell=False, stdin=subprocess.PIPE)
-    p.communicate("\n".join(ipset) + "\n")
-def irc_message(data, l_add):
-    try:
-        with open(IRC_CHANNEL, 'w+') as f:
-            for x in data:
-                try:
-                    hostname = socket.gethostbyaddr(x['ipv4'])[0]
-                except:
-                    hostname = x['ipv4']
-                if x['ipv4'] in l_add:
-                    f.write('%(ip)s(%(hostname)s) kibachva %(reason)s '
-                            'miatt\n' % {'ip': x['ipv4'],
-                                         'reason': x['reason'],
-                                         'hostname': hostname})
-    except:
-        print "nem sikerult mircre irni"
-#        raise
 @task(name="firewall.reload_blacklist")
@@ -114,7 +90,6 @@ def reload_blacklist(data):
    l_add, l_del = ipset_save(data)
    ipset_restore(l_add, l_del)
-    irc_message(data, l_add)
 # 2013-06-26 12:16:59 DHCPACK on 10.4.0.14 to 5c:b5:24:e6:5c:81
@@ -131,8 +106,6 @@ dhcp_ack_re = re.compile(r'\S DHCPACK on (?P<ip>[0-9.]+) to '
 dhcp_no_free_re = re.compile(r'\S DHCPDISCOVER '
                             r'from (?P<mac>[a-zA-Z0-9:]+) '
                             r'via (?P<interface>[a-zA-Z0-9]+):')
-#                             r'.* no free leases')
-#                        r'(\((?P<hostnamename>[^)]+)\) )?'
 @task(name="firewall.get_dhcp_clients")
@@ -152,21 +125,26 @@ def get_dhcp_clients():
            ip = m.get('ip', None)
            hostname = m.get('hostname', None)
            interface = m.get('interface', None)
-            clients[mac] = {'ip': ip, 'hostname': hostname, 'interface': interface}
+            clients[mac] = {'ip': ip, 'hostname': hostname,
+                            'interface': interface}
    return clients
 def start_firewall():
    try:
-        subprocess.call('sudo ipset create blacklist hash:ip family '
+        ns_exec(NETNS, ('/usr/sbin/ipset', 'create', 'blacklist',
-                        'inet hashsize 4096 maxelem 65536 2>/dev/null',
+                        'hash:ip', 'family', 'inet', 'hashsize',
-                        shell=True)
+                        '4096', 'maxelem', '65536'))
+    except:
+        pass
+    try:
        with open(FIREWALL_CONF, 'r') as f:
            data4, data6 = json.load(f)
            reload_firewall(data4, data6, True)
    except:
        print 'nemsikerult:('
+        raise
 def start_networking():
@@ -176,6 +154,7 @@ def start_networking():
            reload_firewall_vlan(data, True)
    except:
        print 'nemsikerult:('
+        raise
 def main():

--- a/ovs.py
+++ b/ovs.py
-import subprocess
 from netaddr import IPNetwork
 import logging
+from utils import NETNS, sudo, ns_exec
 class IPDevice:
    def __init__(self, devname):
        self.devname = devname
    def _run(self, *args):
-        args = ('sudo', 'ip', 'addr', ) + args
+        args = ('/sbin/ip', 'addr', ) + args
-        logging.debug('subprocess_check_output: {}'.format(args))
+        return ns_exec(NETNS, args)
-        return subprocess.check_output(args)
    def show(self):
        retval = []
@@ -28,6 +28,9 @@ class IPDevice:
    def add(self, address):
        self._run('add', str(address), 'dev', self.devname)
+    def up(self):
+        ns_exec(NETNS, ('/sbin/ip', 'link', 'set', 'up', self.devname))
    def migrate(self, new_addresses):
        old_addresses = [str(x) for x in self.show()]
        new_addresses = [str(x) for x in new_addresses]
@@ -53,8 +56,12 @@ class Switch:
            pass
    def _run(self, *args):
-        args = ('sudo', 'ovs-vsctl', ) + args
+        args = ('ovs-vsctl', ) + args
-        return subprocess.check_output(args)
+        return sudo(args)
+    def _setns(self, dev):
+        args = ('/sbin/ip', 'link', 'set', dev, 'netns', NETNS)
+        return sudo(args)
    def list_ports(self):
        retval = {}
@@ -88,22 +95,17 @@ class Switch:
            params = ['add-bond', self.brname,
                      name] + interfaces + ['tag=%d' % int(tag)]
        else:
-            params = ['add-port', self.brname, name, 'tag=%d' % int(tag)]
+            params = ['add-port', self.brname, name]
+            if tag is not None:
+                params = params + ['tag=%d' % int(tag)]
        if internal:
            params = params + ['--',  'set', 'Interface', interfaces[0],
                               'type=internal']
        if trunks is not None and len(trunks) > 0:
            params.append('trunks=%s' % trunks)
        self._run(*params)
-        self.ip_link_up(interfaces)
+        if not internal:
+            self._setns(name)
-    def ip_link_up(self, interfaces):
-        for interface in interfaces:
-            try:
-                subprocess.check_output(['sudo', 'ip', 'link',
-                                         'set', 'up', interface])
-            except:
-                pass
    def delete_port(self, name):
        self._run('del-port', self.brname, name)
@@ -139,7 +141,7 @@ class Switch:
                self.delete_port(i)
        for i in add:
            internal = new_ports[i].get('type', '') == 'internal'
-            tag = new_ports[i]['tag']
+            tag = new_ports[i].get('tag', None)
            trunks = new_ports[i].get('trunks', [])
            interfaces = new_ports[i]['interfaces']
            self.add_port(i, interfaces, tag, trunks, internal)
@@ -150,5 +152,7 @@ class Switch:
                interface.migrate([IPNetwork(x)
                                   for x in data.get('addresses', [])
                                  if x != 'None'])
+                if new_ports[i].get('type', '') == 'internal':
+                    interface.up()
            except:
                pass
--- a/utils.py
+++ b/utils.py
+from os import getenv, devnull
+import subprocess as sp
+import logging
+logger = logging.getLogger(__name__)
+logger.setLevel(logging.DEBUG)
+NETNS = getenv('NETNS', 'fw')
+def sudo(args, stdin=None):
+    FNULL = open(devnull, 'w')
+    args = ('/usr/bin/sudo', ) + args
+    logger.debug('EXEC {}'.format(' '.join(args)))
+    if isinstance(stdin, basestring):
+        proc = sp.Popen(args, stdin=sp.PIPE, stderr=FNULL)
+        return proc.communicate(stdin)
+    else:
+        return sp.check_output(args, stderr=FNULL)
+def ns_exec(netns, args, stdin=None):
+    return sudo(('/sbin/ip', 'netns', 'exec',
+                NETNS) + args, stdin)