new layout - make room for slice-space stuff

[vsys-scripts.git] / root-context / exec / vif_down

diff --git a/root-context/exec/vif_down b/root-context/exec/vif_down
new file mode 100755 (executable)
index 0000000..fe121c7
--- /dev/null
+++ b/root-context/exec/vif_down
@@ -0,0 +1,88 @@
+#!/usr/bin/python
+# VSYS script to ifdown per-slice virtual network interfaces from the root slice
+#   Thom Haddow - 06/10/09
+#
+# Gets slice name as argv[1]
+# Takes remaining args on stdin:
+#   - Interface name (eg [tun|tap]<sliceid>-<n>)
+
+import sys
+import pwd
+import os
+import re
+import string
+
+if len(sys.argv) != 2: sys.exit(1)
+
+# VSYS scripts get slicename as $1
+slicename=sys.argv[1]
+sliceid = pwd.getpwnam(slicename).pw_uid
+
+
+arglines = map(string.strip, sys.stdin.readlines())
+
+if len(arglines)<1:
+    print >>sys.stderr, "Insufficient argument lines."
+    sys.exit(1)
+
+vif = arglines[0] # interface name
+
+# Create options list
+if len(arglines)>1:
+    options = arglines[1:]
+else:
+    options = []
+
+opt_delete = False
+
+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=="delete":
+        if val=="0":
+            opt_delete=False
+        elif val=="1":
+            opt_delete=True
+        else:
+            print >>sys.stderr, "rp_filter value invalid: \"%s\"" % (val)
+            sys.exit(1)
+    else:
+        print >>sys.stderr, "Unknown option: \"%s\"" % (opt)
+        sys.exit(1)
+
+# Validate interface name
+if len(vif)>16:
+    print >>sys.stderr, "Interface name %s invalid"%(vif)
+    sys.exit(1)
+
+if re.match(r'(tun|tap)%d-\d+' % sliceid, vif ) is None:
+    print >>sys.stderr, "Interface name %s does not match slice id %d."%(vif, sliceid)
+    sys.exit(1)
+
+
+
+# Remove iptables rules
+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_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_del_out = "/sbin/iptables -D OUTPUT -o %s -m mark -m state --state NEW ! --mark %d -j DROP 2>/dev/null" % (vif, sliceid)
+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,)
+cmd_gre_del = "ip link del %s 2>/dev/null" % (vif,)
+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)
+
+os.system(cmd_iptables_del_in)
+os.system(cmd_iptables_del_out)
+os.system(cmd_iptables_del_pr)
+os.system(cmd_iptables_del_gre_pr)
+
+# Bring interface down
+cmd_ifconfig = "/sbin/ifconfig %s down" % (vif)
+os.system(cmd_ifconfig)
+
+# Delete GRE tunnel (if any)
+if (opt_delete):
+    os.system(cmd_gre_del)