net.py is a 'required' 'plugin' module similar to conf_files.py, bwmon.py, and sm.py

[nodemanager.git] / net.py

diff --git a/net.py b/net.py
new file mode 100644 (file)
index 0000000..7c9242d
--- /dev/null
+++ b/net.py
@@ -0,0 +1,160 @@
+#
+# $Id$
+#
+
+"""network configuration"""
+
+# system provided modules
+import os, string, time, socket
+
+# PlanetLab system modules
+import sioc, plnet
+
+# local modules
+import bwlimit, logger, iptables
+
+def start(options, conf):
+    logger.log("net plugin starting up...")
+
+def GetSlivers(plc, data, config):
+    logger.verbose("net:GetSlivers called.")
+    InitInterfaces(plc, data) # writes sysconfig files.
+    if 'OVERRIDES' in dir(config): 
+        if config.OVERRIDES.get('net_max_rate') == '-1':
+            logger.log("net: Slice and node BW Limits disabled.")
+            if len(bwlimit.tc("class show dev eth0")): 
+                logger.verbose("*** DISABLING NODE BW LIMITS ***")
+                bwlimit.stop()
+        else:
+            InitNodeLimit(data)
+            InitI2(plc, data)
+    else:
+        InitNodeLimit(data)
+        InitI2(plc, data)
+    InitNAT(plc, data)
+
+
+def InitNodeLimit(data):
+    if not 'networks' in data: return
+
+    # query running network interfaces
+    devs = sioc.gifconf()
+    ips = dict(zip(devs.values(), devs.keys()))
+    macs = {}
+    for dev in devs:
+        macs[sioc.gifhwaddr(dev).lower()] = dev
+
+    for network in data['networks']:
+        # Get interface name preferably from MAC address, falling
+        # back on IP address.
+        hwaddr=network['mac']
+        if hwaddr <> None: hwaddr=hwaddr.lower()
+        if hwaddr in macs:
+            dev = macs[network['mac']]
+        elif network['ip'] in ips:
+            dev = ips[network['ip']]
+        else:
+            logger.log('%s: no such interface with address %s/%s' % (network['hostname'], network['ip'], network['mac']))
+            continue
+
+        # Get current node cap
+        try:
+            old_bwlimit = bwlimit.get_bwcap(dev)
+        except:
+            old_bwlimit = None
+
+        # Get desired node cap
+        if network['bwlimit'] is None or network['bwlimit'] < 0:
+            new_bwlimit = bwlimit.bwmax
+        else:
+            new_bwlimit = network['bwlimit']
+
+        if old_bwlimit != new_bwlimit:
+            # Reinitialize bandwidth limits
+            bwlimit.init(dev, new_bwlimit)
+
+            # XXX This should trigger an rspec refresh in case
+            # some previously invalid sliver bwlimit is now valid
+            # again, or vice-versa.
+
+def InitI2(plc, data):
+    if not 'groups' in data: return
+
+    if "Internet2" in data['groups']:
+        logger.log("This is an Internet2 node.  Setting rules.")
+        i2nodes = []
+        i2nodeids = plc.GetNodeGroups(["Internet2"])[0]['node_ids']
+        for node in plc.GetInterfaces({"node_id": i2nodeids}, ["ip"]):
+            # Get the IPs
+            i2nodes.append(node['ip'])
+        # this will create the set if it doesn't already exist
+        # and add IPs that don't exist in the set rather than
+        # just recreateing the set.
+        bwlimit.exempt_init('Internet2', i2nodes)
+        
+        # set the iptables classification rule if it doesnt exist.
+        cmd = '-A POSTROUTING -m set --set Internet2 dst -j CLASSIFY --set-class 0001:2000 --add-mark'
+        rules = []
+        ipt = os.popen("/sbin/iptables-save")
+        for line in ipt.readlines(): rules.append(line.strip(" \n"))
+        ipt.close()
+        if cmd not in rules:
+            logger.verbose("net:  Adding iptables rule for Internet2")
+            os.popen("/sbin/iptables -t mangle " + cmd)
+
+def InitNAT(plc, data):
+    if not 'networks' in data: return
+    
+    # query running network interfaces
+    devs = sioc.gifconf()
+    ips = dict(zip(devs.values(), devs.keys()))
+    macs = {}
+    for dev in devs:
+        macs[sioc.gifhwaddr(dev).lower()] = dev
+
+    ipt = iptables.IPTables()
+    for network in data['networks']:
+        # Get interface name preferably from MAC address, falling
+        # back on IP address.
+        hwaddr=network['mac']
+        if hwaddr <> None: hwaddr=hwaddr.lower()
+        if hwaddr in macs:
+            dev = macs[network['mac']]
+        elif network['ip'] in ips:
+            dev = ips[network['ip']]
+        else:
+            logger.log('%s: no such interface with address %s/%s' % (network['hostname'], network['ip'], network['mac']))
+            continue
+
+        try:
+            settings = plc.GetInterfaceTags({'interface_tag_id': network['interface_tag_ids']})
+        except:
+            continue
+
+        for setting in settings:
+            if setting['category'].upper() != 'FIREWALL':
+                continue
+            if setting['name'].upper() == 'EXTERNAL':
+                # Enable NAT for this interface
+                ipt.add_ext(dev)
+            elif setting['name'].upper() == 'INTERNAL':
+                ipt.add_int(dev)
+            elif setting['name'].upper() == 'PF': # XXX Uglier code is hard to find...
+                for pf in setting['value'].split("\n"):
+                    fields = {}
+                    for field in pf.split(","):
+                        (key, val) = field.split("=", 2)
+                        fields[key] = val
+                    if 'new_dport' not in fields:
+                        fields['new_dport'] = fields['dport']
+                    if 'source' not in fields:
+                        fields['source'] = "0.0.0.0/0"
+                    ipt.add_pf(fields)
+    ipt.commit()
+
+def InitInterfaces(plc, data):
+    if not 'networks' in data: return
+    plnet.InitInterfaces(logger, plc, data)
+
+def start(options, config):
+    pass