# Gets slice name as argv[1]
# Takes remaining args on stdin:
# - Interface name (eg [tun|tap]<sliceid>-<n>)
-# - IP address (eg 1.2.3.4)
+# - (private) IP address (eg 1.2.3.4)
# - Netmask (as int, e.g. 24)
# - Followed by options as name=value pairs
+#
+# Options:
+# - pointopoint=IP: other endpoint's (private) IP (sets routing)
+# - snat=1: enables SNAT ip rules
+# - txqueuelen=N: sets TX queue
+# - gre=<> : enable GRE tunnelling - several formats supported
+# - gre=true|yes|name : computes GRE key as a hash of slice name (so it's valid across federations)
+# - gre=id : uses for GRE key the slice id (the one from the myplc database)
+# - gre=somestring : computes GRE key as a hash of the provided string
+# - gre=somekey : use the provided key as is
+# - remote=IP : when using GRE, the (public) IP for the remote endpoint
import sys
import pwd
# VSYS scripts get slicename as $1
slicename=sys.argv[1]
+# the local xid for this slice
sliceid = pwd.getpwnam(slicename).pw_uid
netblock_config=os.path.join(vsys_config_dir,slicename,"vsys_vnet")
opt_snat = None
opt_ovs_dp = None
opt_pointopoint = None
+opt_gre = None
+opt_gre_remote = None
for optionline in options:
try:
socket.inet_aton(opt_pointopoint)
except socket.error,e:
- print >>sys.stderr, "pointopoint: %s" % (e,)
+ print >>sys.stderr, "could not parse pointopoint: %s" % (e,)
+ sys.exit(1)
elif opt=="vswitch":
opt_ovs_dp = val
+ # support several formats, parse later on
+ elif opt=="gre":
+ opt_gre = val
+ elif opt=="remote":
+ opt_gre_remote = val.strip()
+ try:
+ socket.inet_aton(opt_gre_remote)
+ except socket.error,e:
+ print >>sys.stderr, "could not parse remote: %s" % (e,)
+ sys.exit(1)
else:
print >>sys.stderr, "Unknown option: \"%s\"" % (opt)
sys.exit(1)
+# post processing for gre mode
+if opt_gre:
+ if not opt_pointopoint:
+ print >>sys.stderr, "GRE tunnels need a pointopoint address"
+ sys.exit(1)
+ if not opt_gre_remote:
+ print >>sys.stderr, "GRE tunnels need a pointopoint address"
+ sys.exit(1)
+
+ if vif.startswith('tun'):
+ opt_gre_type = 'gre'
+ else:
+ opt_gre_type = 'gretap'
+
+ opt_gre=opt_gre.lower()
+ # helper - keys are expected between 0 and 2**32-1
+ def gre_hash (string):
+ return hash(string) & 0xffffffff
+ # compute gre_key according to option format
+ if opt_gre in ('yes','true','name'):
+ gre_key=gre_hash(slicename)
+ elif opt_gre in ('id','sliceid'):
+ # use slice_id as the key - this is the one from myplc - won't work across federation
+ gre_key = int(open("/etc/vservers/%s/slice_id" % (slicename,),"r").read().strip())
+ elif opt_gre.isdigit():
+ # use as-is
+ gre_key=int(opt_gre)
+ else:
+ # hash the provided string
+ gre_key=gre_hash(opt_gre)
+ ### temporary - debug
+ ### use ip tunnel show to obtain the key, but it only works with IP over GRE
+ #open('/tmp/%s.key'%vif,'w').write('%s\n'%gre_key)
+
### Configure interface
if opt_pointopoint is not None:
cmd_ifconfig += " pointopoint %s" % (opt_pointopoint,)
-os.system(cmd_ifconfig)
-
# Add iptables rules (Clearing old ones first, if they exist)
cmd_iptables_in = "/sbin/iptables -A INPUT -i %s -m mark -m state --state NEW ! --mark %d -j DROP" % (vif, sliceid)
cmd_iptables_del_in = "/sbin/iptables -D INPUT -i %s -m mark -m state --state NEW ! --mark %d -j DROP 2>/dev/null" % (vif, sliceid)
cmd_iptables_out = "/sbin/iptables -A OUTPUT -o %s -m state --state NEW -m mark ! --mark %d -j DROP" % (vif, sliceid)
cmd_iptables_del_out = "/sbin/iptables -D OUTPUT -o %s -m state --state NEW -m mark ! --mark %d -j DROP 2>/dev/null" % (vif, sliceid)
+# this initial form should work again now, but for some reason on 2.6.27, 'ip route get ...' returns an empty line
+#public_src = os.popen("ip route get 1.1.1.1 | head -1 | awk '{print $7;}'").read().rstrip();
public_src = os.popen("ifconfig | grep $(ip route | grep default | awk '{print $3}' | awk -F. '{print $1\"[.]\"$2}') | head -1 | awk '{print $2}' | awk -F : '{print $2}'").read().rstrip()
cmd_iptables_pr = "/sbin/iptables -t nat -A POSTROUTING -s %s/%d -j SNAT --to-source %s --random" % (vip, vmask, public_src)
cmd_iptables_del_pr = "/sbin/iptables -t nat -D POSTROUTING -s %s/%d -j SNAT --to-source %s --random > /dev/null 2>&1" % (vip, vmask, public_src)
+
+if opt_gre:
+ cmd_gre_setup = "modprobe ip_gre ; ip link add %s type %s remote %s local %s ttl 64 csum key %s" % (
+ vif, opt_gre_type, opt_gre_remote, public_src, gre_key )
+ cmd_iptables_gre_pr = "/sbin/iptables -t mangle -A INPUT -i %s -m mark --mark 0 -j MARK --set-mark %s 2>/dev/null" % (
+ vif, int(sliceid))
+
+ os.system(cmd_gre_setup)
+ os.system(cmd_iptables_gre_pr)
+
+os.system(cmd_ifconfig)
+
os.system(cmd_iptables_del_in)
os.system(cmd_iptables_in)
os.system(cmd_iptables_del_out)
os.system(cmd_iptables_del_pr)
if (opt_snat):
os.system(cmd_iptables_pr)
- #print cmd_iptables_del_pr
- #print cmd_iptables_pr
-
-#if opt_pointopoint and vmask < 32:
-# # Make target vnet masked address
-# p2p_int = struct.unpack('!L', socket.inet_aton(opt_pointopoint))[0]
-# vip_vnet = socket.inet_ntoa(
-# struct.pack('!L', ((p2p_int>>(32-vmask))<<(32-vmask))) )
-#
-# cmd_routing_p2p = "/sbin/route add -net %s/%d gw %s dev %s" % (vip_vnet, vmask, opt_pointopoint, vif)
-# print >>sys.stderr, cmd_routing_p2p
-# os.system(cmd_routing_p2p)
# Process additional options
if opt_rp_filter is not None: