X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=topo.py;h=a9a9853ef9b5c91577f8d95050429b62089d5a79;hb=f6ed4fcd49097356b5f23143e1df6fc7eb20dcb4;hp=8174dbf1e1063ea5855380d8f4e8a505a6ce8ed2;hpb=5da41057201cd8d236ce6623ca74061e68f28f98;p=nodemanager-topo.git

diff --git a/topo.py b/topo.py
index 8174dbf..a9a9853 100755
--- a/topo.py
+++ b/topo.py
@@ -12,10 +12,14 @@ import sioc
 import re
 import vserver
 import os
+from time import strftime
 
-dryrun=0
-setup_link_cmd="/usr/share/vini/setup-egre-link"
-teardown_link_cmd="/usr/share/vini/teardown-egre-link"
+dryrun = 0
+vinidir = "/usr/share/vini/"
+setup_link_cmd = vinidir + "setup-egre-link"
+teardown_link_cmd = vinidir + "teardown-egre-link"
+setup_nat_cmd = vinidir + "setup-nat"
+teardown_nat_cmd = vinidir + "teardown-nat"
 ifaces = {}
 old_ifaces = {}
 
@@ -27,6 +31,13 @@ def run(cmd):
         return subprocess.call(cmd, shell=True);
 
 
+"""
+Subnet used for virtual interfaces by setup-egre-link script
+"""
+def iias_network():
+    return "192.168.0.0 255.255.0.0"
+
+
 """
 Check for existence of interface d<key>x<nodeid>
 """
@@ -37,20 +48,14 @@ def virtual_link(key, nodeid):
     else:
         return False
 
-
 """
 Create a "virtual link" for slice between here and nodeid.
 The key is used to create the EGRE tunnel.
 """
-def setup_virtual_link(slice, key, rate, myid, nodeid, ipaddr):
+def setup_virtual_link(slice, key, rate, myid, nodeid, ipaddr, virtip, vnet):
     logger.log("%s: Set up virtual link to node %d" % (slice, nodeid))
-    if myid < nodeid:
-        virtip = "10.%d.%d.2" % (myid, nodeid)
-    else:
-        virtip = "10.%d.%d.3" % (nodeid, myid)
-        
-    run(setup_link_cmd + " %s %s %s %s %s %s" % (slice, nodeid, ipaddr, 
-                                                 key, rate, virtip))
+    run(setup_link_cmd + " %s %s %s %s %s %s %s" % (slice, nodeid, ipaddr, 
+                                                 key, rate, virtip, vnet))
     return
 
 
@@ -67,11 +72,57 @@ def teardown_virtual_link(key, nodeid):
 Called for all active virtual link interfaces, so they won't be cleaned up.
 """
 def refresh_virtual_link(nodeid, key):
-    try:
-        name = "d%sx%s" % (key, nodeid)
+    name = "d%sx%s" % (key, nodeid)
+    if name in old_ifaces:
+        del old_ifaces[name]
+    return
+
+
+"""
+IP address of the NAT interface created inside the slice by the
+setup-nat script.
+"""
+def nat_inner_ip(key):
+    return "10.0.%s.2" % key
+
+
+"""
+Check for existence of interface natx<key>
+"""
+def nat_exists(key):
+    name = "natx%s" % key
+    if name in ifaces:
+        return True
+    else:
+        return False
+
+
+"""
+Create a NAT interface inside the sliver.  
+"""
+def setup_nat(slice, myid, key):
+    logger.log("%s: Set up NAT" % slice)
+    run(setup_nat_cmd + " %s %s %s" % (slice, myid, key))
+    return
+
+
+"""
+Tear down the NAT interface identified by key
+"""
+def teardown_nat(key):
+    logger.log("topo: Tear down NAT %s" % key)
+    run(teardown_nat_cmd + " %s" % key)
+    return
+
+
+"""
+Called for all active NAT interfaces, so they won't be cleaned up.
+"""
+def refresh_nat(key):
+    name = "natx%s" % (key)
+    if name in old_ifaces:
         del old_ifaces[name]
-    except:
-        pass
+    return
 
 
 """
@@ -79,14 +130,21 @@ Clean up old virtual links (e.g., to nodes that have been deleted
 from the slice).
 """
 def clean_up_old_virtual_links():
-    pattern = "d(.*)x(.*)"
+    pattern1 = "d(.*)x(.*)"
+    pattern2 = "natx(.*)"
     for iface in old_ifaces:
-        m = re.match(pattern, iface)
+        m = re.match(pattern1, iface)
         if m:
             key = int(m.group(1))
             node = int(m.group(2))
             teardown_virtual_link(key, node)
 
+        m = re.match(pattern2, iface)
+        if m:
+            key = int(m.group(1))
+            teardown_nat(key)
+    return
+
 
 """
 Not the safest thing to do, probably should use pickle() or something.
@@ -98,16 +156,25 @@ def convert_topospec_to_list(rspec):
 """
 Update virtual links for the slice
 """
-def update(slice, myid, topospec, key, netns):
+def update_links(slice, myid, topospec, key, netns):
     topolist = convert_topospec_to_list(topospec)
-    for (nodeid,ipaddr,rate) in topolist:
+    for (nodeid, ipaddr, rate, myvirtip, remvirtip, virtnet) in topolist:
         if not virtual_link(key, nodeid):
             if netns:
-                setup_virtual_link(slice, key, rate, myid, nodeid, ipaddr)
+                setup_virtual_link(slice, key, rate, myid, nodeid, 
+                                   ipaddr, myvirtip, virtnet)
         else:
             logger.log("%s: virtual link to node %s exists" % (slice, nodeid))
             refresh_virtual_link(nodeid, key)
 
+    if not nat_exists(key):
+        if netns:
+            setup_nat(slice, myid, key)
+    else:
+        logger.log("%s: NAT exists" % slice)
+        refresh_nat(key)
+
+
 """
 Write /etc/vservers/<slicename>/spaces/net
 """
@@ -119,7 +186,7 @@ def writeConf(slicename, value):
             try:
                 os.mkdir(SPACESDIR)
             except os.error:
-                logger.log("netns: could not create %s\n" % SPACESDIR)
+                logger.log("topo: could not create %s\n" % SPACESDIR)
                 return
         f = open("%s/net" % SPACESDIR, "w")
         f.write("%s\n" % value)
@@ -130,7 +197,148 @@ def writeConf(slicename, value):
         logger.log("%s: network namespace %s\n" % (slicename, STATUS))
 
 
+"""
+Generate information for each interface in the sliver, in order to configure
+Quagga.
+"""
+def get_ifaces(hostname, myid, topospec, key):
+    ifaces = {}
+    topolist = convert_topospec_to_list(topospec)
+    for (nodeid, ipaddr, rate, myvirtip, remvirtip, virtnet) in topolist:
+        name = "a%sx%s" % (key, nodeid)
+        ifaces[name] = {}
+        ifaces[name]['remote-ip'] = remvirtip
+        ifaces[name]['local-ip'] = myvirtip
+        ifaces[name]['network'] = virtnet
+        ifaces[name]['short-name'] = hostname.replace('.vini-veritas.net', '')
+    return ifaces
+
+
+def write_header(f, myname, password):
+    f.write ("""! Configuration for %s
+! Generated at %s
+
+hostname %s
+password %s
+
+""" % (myname, strftime("%Y-%m-%d %H:%M:%S"), myname, password))
+    return
+
+
+"""
+IP address of NAT gateway to outside world
+"""
+def nat_gw(key):
+    return "10.0.%s.1" %  key
+
+"""
+IP address of the NAT interface inside the slice
+"""
+def nat_inner(key):
+    return "10.0.%s.2" % key
+
+
+"""
+Write zebra.conf file for Quagga
+"""
+def write_zebra(filename, myname, ifaces, myid, key):
+    f = open(filename, 'w')
+    password = "zebra"
+    write_header(f, myname, password)
+
+    f.write ("enable password %s\n" % password)
+
+    for name in ifaces:
+        f.write ("""!     
+interface %s
+link-detect
+""" %  name)
+
+    f.write ("""!
+access-list vty permit 127.0.0.1/32
+!
+line vty
+!
+""")
+    f.close()
+    return
+
+
+"""
+Write ospfd.conf file for Quagga.  
+"""
+def write_ospf(filename, myname, ifaces):
+    f = open(filename, 'w')
+    password = "zebra"
+    write_header(f, myname, password)
+
+    for name in ifaces:
+        f.write ("""!
+     interface %s
+     ip ospf cost 10
+     ip ospf hello-interval 5
+     ip ospf dead-interval 10
+     ip ospf network non-broadcast
+""" % name)
+
+    f.write ("""!
+     router ospf
+     ospf router-id %s
+""" % ifaces[name]['local-ip'])
+
+    for name in ifaces:
+        f.write ("     neighbor %s\n" % ifaces[name]['remote-ip'])
+
+    for name in ifaces:
+        net = ifaces[name]['network']
+        f.write ("     network %s area 0\n" % net)
+
+    f.write("""     redistribute kernel
+!
+access-list vty permit 127.0.0.1/32
+!
+line vty
+""")
+    return
+
+
+"""
+Write config files directly into the slice's file system.
+"""
+def update_quagga_configs(slicename, hostname, myid, topo, key, netns):
+    ifaces = get_ifaces(hostname, myid, topo, key)
+
+    quagga_dir = "/vservers/%s/etc/quagga/" % slicename
+    if not os.path.exists(quagga_dir):
+        try:
+            # Quagga not installed.  Install it here?  Chkconfig, sym links.
+            os.mkdir(quagga_dir)
+        except os.error:
+            logger.log("topo: could not create %s\n" % quagga_dir)
+            return
+
+    write_zebra(quagga_dir + "zebra.conf.generated", hostname, ifaces, 
+                myid, key)
+    write_ospf(quagga_dir + "ospfd.conf.generated", hostname, ifaces)
+
+    # Start up Quagga if we installed it earlier and netns = 1.
+
+    return
+
+
+"""
+Write /etc/hosts in the sliver
+"""
+def update_hosts(slicename, hosts):
+    hosts_file = "/vservers/%s/etc/hosts" % slicename
+    f = open(hosts_file, 'w')
+    f.write(hosts)
+    f.close()
+    return
+
+
 def start(options, config):
+    run ("echo 1 > /proc/sys/net/ipv4/ip_forward")
     pass
 
 
@@ -155,17 +363,22 @@ def GetSlivers(data):
         else:
             netns = 0
 
-        try:
-            if vserver.VServer(sliver['name']).is_running():
-                if 'egre_key' in attrs and 'topo_rspec' in attrs:
-                    logger.log("topo: Update topology for slice %s" % \
-                                   sliver['name'])
-                    update(sliver['name'], data['node_id'], 
-                           attrs['topo_rspec'], attrs['egre_key'], netns)
-        except:
+        if vserver.VServer(sliver['name']).is_running():
+            if 'egre_key' in attrs and 'topo_rspec' in attrs:
+                logger.log("topo: Update topology for slice %s" % \
+                               sliver['name'])
+                update_links(sliver['name'], data['node_id'], 
+                             attrs['topo_rspec'], attrs['egre_key'], netns)
+                update_quagga_configs(sliver['name'], data['hostname'],
+                               data['node_id'], attrs['topo_rspec'], 
+                               attrs['egre_key'], netns)
+            if 'hosts' in attrs:
+                update_hosts(sliver['name'], attrs['hosts'])
+        else:
             logger.log("topo: sliver %s not running yet. Deferring." % \
                            sliver['name'])
 
     clean_up_old_virtual_links()
+    return