2 # VSYS script to ifdown per-slice virtual network interfaces from the root slice
3 # Thom Haddow - 06/10/09
5 # Gets slice name as argv[1]
6 # Takes remaining args on stdin:
7 # - Interface name (eg [tun|tap]<sliceid>-<n>)
15 if len(sys.argv) != 2: sys.exit(1)
17 # VSYS scripts get slicename as $1
19 sliceid = pwd.getpwnam(slicename).pw_uid
22 arglines = map(string.strip, sys.stdin.readlines())
25 print >>sys.stderr, "Insufficient argument lines."
28 vif = arglines[0] # interface name
32 options = arglines[1:]
38 for optionline in options:
39 if len(optionline)==0: continue
41 opt, val = optionline.split('=')
43 print >>sys.stderr, "Bad option line: \"%s\"" % (optionline)
52 print >>sys.stderr, "rp_filter value invalid: \"%s\"" % (val)
55 print >>sys.stderr, "Unknown option: \"%s\"" % (opt)
58 # Validate interface name
60 print >>sys.stderr, "Interface name %s invalid"%(vif)
63 if re.match(r'(tun|tap)%d-\d+' % sliceid, vif ) is None:
64 print >>sys.stderr, "Interface name %s does not match slice id %d."%(vif, sliceid)
69 # Remove iptables rules
70 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()
71 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)
72 cmd_iptables_del_out = "/sbin/iptables -D OUTPUT -o %s -m mark -m state --state NEW ! --mark %d -j DROP 2>/dev/null" % (vif, sliceid)
73 cmd_iptables_del_pr = "/sbin/iptables -t nat -D POSTROUTING -s $(ip ro | grep 'dev %s' | head -1 | awk '{print $1}') -j SNAT --to-source %s --random 2>/dev/null" % (vif, public_src,)
74 cmd_gre_del = "ip link del %s 2>/dev/null" % (vif,)
75 cmd_iptables_del_gre_pr = "/sbin/iptables -t mangle -D INPUT -i %s -m mark --mark 0 -j MARK --set-mark %s 2>/dev/null" % (vif, sliceid)
77 os.system(cmd_iptables_del_in)
78 os.system(cmd_iptables_del_out)
79 os.system(cmd_iptables_del_pr)
80 os.system(cmd_iptables_del_gre_pr)
82 # Bring interface down
83 cmd_ifconfig = "/sbin/ifconfig %s down" % (vif)
84 os.system(cmd_ifconfig)
86 # Delete GRE tunnel (if any)
88 os.system(cmd_gre_del)