Tests: Refactor duplicated code.

Naveen suggested earlier today that we should refactor duplicate code.
This commit kicks off the effort.

Change-Id: I855b0f40d41d1f3a2e673f3b254b76b596409656
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>

3 files changed, 14 insertions, 21 deletions

diff --git a/test/test_dhcp6.py b/test/test_dhcp6.py
index 6c203868673..7510543af8e 100644
--- a/test/test_dhcp6.py
+++ b/test/test_dhcp6.py
@@ -1,3 +1,5 @@
+from socket import AF_INET6
+
 from scapy.layers.dhcp6 import DHCP6_Advertise, DHCP6OptClientId, \
     DHCP6OptStatusCode, DHCP6OptPref, DHCP6OptIA_PD, DHCP6OptIAPrefix, \
     DHCP6OptServerId, DHCP6_Solicit, DHCP6_Reply, DHCP6_Request, DHCP6_Renew, \
@@ -6,20 +8,15 @@ from scapy.layers.dhcp6 import DHCP6_Advertise, DHCP6OptClientId, \
 from scapy.layers.inet6 import IPv6, Ether, UDP
 from scapy.utils6 import in6_mactoifaceid
 from scapy.utils import inet_ntop, inet_pton
-from socket import AF_INET6
+
 from framework import VppTestCase
+import util
 
 
 def ip6_normalize(ip6):
     return inet_ntop(AF_INET6, inet_pton(AF_INET6, ip6))
 
 
-def mk_ll_addr(mac):
-    euid = in6_mactoifaceid(mac)
-    addr = "fe80::" + euid
-    return addr
-
-
 class TestDHCPv6DataPlane(VppTestCase):
     """ DHCPv6 Data Plane Test Case """
 
@@ -88,7 +85,7 @@ class TestDHCPv6DataPlane(VppTestCase):
             ia_na_opts = DHCP6OptIAAddress(addr='7:8::2', preflft=60,
                                            validlft=120)
             p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
-                 IPv6(src=mk_ll_addr(self.pg0.remote_mac),
+                 IPv6(src=util.mk_ll_addr(self.pg0.remote_mac),
                       dst=self.pg0.local_ip6_ll) /
                  UDP(sport=547, dport=546) /
                  DHCP6_Advertise(trid=trid) /
@@ -165,7 +162,7 @@ class TestDHCPv6DataPlane(VppTestCase):
             ia_pd_opts = DHCP6OptIAPrefix(prefix='7:8::', plen=56, preflft=60,
                                           validlft=120)
             p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
-                 IPv6(src=mk_ll_addr(self.pg0.remote_mac),
+                 IPv6(src=util.mk_ll_addr(self.pg0.remote_mac),
                       dst=self.pg0.local_ip6_ll) /
                  UDP(sport=547, dport=546) /
                  DHCP6_Advertise(trid=trid) /
@@ -317,7 +314,7 @@ class TestDHCPv6IANAControlPlane(VppTestCase):
         else:
             opt_ia_na = DHCP6OptIA_NA(iaid=1, T1=t1, T2=t2, ianaopts=ianaopts)
         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
-             IPv6(src=mk_ll_addr(self.pg0.remote_mac),
+             IPv6(src=util.mk_ll_addr(self.pg0.remote_mac),
                   dst=self.pg0.local_ip6_ll) /
              UDP(sport=547, dport=546) /
              msg_type(trid=self.trid) /
@@ -569,7 +566,7 @@ class TestDHCPv6PDControlPlane(VppTestCase):
         else:
             opt_ia_pd = DHCP6OptIA_PD(iaid=1, T1=t1, T2=t2, iapdopt=iapdopt)
         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
-             IPv6(src=mk_ll_addr(self.pg0.remote_mac),
+             IPv6(src=util.mk_ll_addr(self.pg0.remote_mac),
                   dst=self.pg0.local_ip6_ll) /
              UDP(sport=547, dport=546) /
              msg_type(trid=self.trid) /
diff --git a/test/test_ip6.py b/test/test_ip6.py
index 6832498dc26..5a5ba51f0ed 100644
--- a/test/test_ip6.py
+++ b/test/test_ip6.py
@@ -18,7 +18,7 @@ from scapy.utils6 import in6_getnsma, in6_getnsmac, in6_ptop, in6_islladdr, \
 from six import moves
 
 from framework import VppTestCase, VppTestRunner
-from util import ppp, ip6_normalize
+from util import ppp, ip6_normalize, mk_ll_addr
 from vpp_ip import DpoProto
 from vpp_ip_route import VppIpRoute, VppRoutePath, find_route, VppIpMRoute, \
     VppMRoutePath, MRouteItfFlags, MRouteEntryFlags, VppMplsIpBind, \
@@ -36,12 +36,6 @@ except NameError:
     text_type = str
 
 
-def mk_ll_addr(mac):
-    euid = in6_mactoifaceid(mac)
-    addr = "fe80::" + euid
-    return addr
-
-
 class TestIPv6ND(VppTestCase):
     def validate_ra(self, intf, rx, dst_ip=None):
         if not dst_ip:
diff --git a/test/util.py b/test/util.py
index 5ce84070a87..fc0ebd73500 100644
--- a/test/util.py
+++ b/test/util.py
@@ -2,18 +2,19 @@
 
 import abc
 import socket
+from socket import AF_INET6
 import six
 import sys
 import os.path
-from scapy.utils6 import in6_mactoifaceid
 
 from scapy.layers.l2 import Ether
-from scapy.packet import Raw
 from scapy.layers.inet import IP
 from scapy.layers.inet6 import IPv6, IPv6ExtHdrFragment, IPv6ExtHdrRouting,\
     IPv6ExtHdrHopByHop
+from scapy.packet import Raw
 from scapy.utils import hexdump
-from socket import AF_INET6
+from scapy.utils6 import in6_mactoifaceid
+
 from io import BytesIO
 from vpp_papi import mac_pton
 
@@ -54,6 +55,7 @@ def ip4n_range(ip4n, s, e):
             for ip in ip4_range(ip4, s, e))
 
 
+# wrapper around scapy library function.
 def mk_ll_addr(mac):
     euid = in6_mactoifaceid(mac)
     addr = "fe80::" + euid