# - Interface name (eg [tun|tap]<sliceid>-<n>)
# - IP address (eg 1.2.3.4)
# - Netmask (as int, e.g. 24)
+# - Followed by options as name=value pairs
import sys
import pwd
import socket
import struct
import os
+import string
vsys_config_dir = "/etc/planetlab/vsys-attributes"
### Read args from stdin
-vif = sys.stdin.readline().strip() # interface name
-vip = sys.stdin.readline().strip() # IP
-vmask = int(sys.stdin.readline().strip()) # netmask as int
+arglines = map(string.strip, sys.stdin.readlines())
-# TODO further config args? txqueue, nat? Can add these later...
+if len(arglines)<3:
+ print >>sys.stderr, "Insufficient argument lines."
+ sys.exit(1)
+vif = arglines[0] # interface name
+vip = arglines[1] # IP
+vmask = int(arglines[2]) # netmask as int
+# Create options list
+if len(arglines)>3:
+ options = arglines[3:]
+else:
+ options = []
# Convert network base addr to int format by unpacking as 32bit net-ordered long (!L)
base_int = struct.unpack('!L',socket.inet_aton(base))[0]
+### Process options
+
+opt_txqueuelen = None
+opt_rp_filter = None
+opt_snat = None
+
+
+for optionline in options:
+ if len(optionline)==0: continue
+ try:
+ opt, val = optionline.split('=')
+ except:
+ print >>sys.stderr, "Bad option line: \"%s\"" % (optionline)
+ sys.exit(1)
+
+ if opt=="rp_filter":
+ if val=="0":
+ opt_rp_filter="0"
+ elif val=="1":
+ opt_rp_filter="1"
+ else:
+ print >>sys.stderr, "rp_filter value invalid: \"%s\"" % (val)
+ sys.exit(1)
+
+ elif opt=="txqueuelen":
+ intval = int(val)
+ if intval<1 or intval>10000:
+ print >>sys.stderr, "txqueuelen value %s out of range 1-10000" % (val)
+ sys.exit(1)
+ opt_txqueuelen = intval
+
+ elif opt=="snat":
+ intval = int(val)
+ if val=="1":
+ opt_snat = True
+ else:
+ print >>sys.stderr, "Unknown option: \"%s\"" % (opt)
+ sys.exit(1)
+
+
+
### Configure interface
-cmd_ifconfig = "/sbin/ifconfig %s %s/%d" % (vif, vip, vmask)
+if opt_txqueuelen is None:
+ cmd_ifconfig = "/sbin/ifconfig %s %s/%d" % (vif, vip, vmask)
+else:
+ cmd_ifconfig = "/sbin/ifconfig %s %s/%d txqueuelen %d" % (vif, vip, vmask, opt_txqueuelen)
+
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 ! --mark %d -j DROP" % (vif, sliceid)
-cmd_iptables_del_in = "/sbin/iptables -D INPUT -i %s -m mark ! --mark %d -j DROP 2>/dev/null" % (vif, sliceid)
-cmd_iptables_out = "/sbin/iptables -A OUTPUT -o %s -m mark ! --mark %d -j DROP" % (vif, sliceid)
-cmd_iptables_del_out = "/sbin/iptables -D OUTPUT -o %s -m mark ! --mark %d -j DROP 2>/dev/null" % (vif, sliceid)
+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)
+
+public_src = os.popen("ip route get 1.1.1.1 | head -1 | awk '{print $7;}'").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" % (vip, vmask, public_src)
os.system(cmd_iptables_del_in)
os.system(cmd_iptables_in)
os.system(cmd_iptables_del_out)
os.system(cmd_iptables_out)
+
+if (opt_snat):
+ os.system(cmd_iptables_del_pr)
+ os.system(cmd_iptables_pr)
+ #print cmd_iptables_del_pr
+ #print cmd_iptables_pr
+
+# Process additional options
+if opt_rp_filter is not None:
+ rp_cmd = "/sbin/sysctl net.ipv4.conf.%s.rp_filter=%s" % (vif, opt_rp_filter)
+ os.system(rp_cmd)
+
+