ip: respect buffer boundary when searching for ipv6 headers

Type: fix

Change-Id: I5a5461652f8115fa1270e20f748178fb5f5450f2
Signed-off-by: Klement Sekera <ksekera@cisco.com>
(cherry picked from commit 769145cdbc28324bd0b6304951199ec3d6e0e883)

1 files changed, 19 insertions, 2 deletions

diff --git a/test/test_reassembly.py b/test/test_reassembly.py
index 0b7073cae40..407b626e1d2 100644
--- a/test/test_reassembly.py
+++ b/test/test_reassembly.py
@@ -10,8 +10,8 @@ import scapy.compat
 from scapy.packet import Raw
 from scapy.layers.l2 import Ether, GRE
 from scapy.layers.inet import IP, UDP, ICMP
-from scapy.layers.inet6 import IPv6, IPv6ExtHdrFragment, ICMPv6ParamProblem,\
-    ICMPv6TimeExceeded
+from scapy.layers.inet6 import HBHOptUnknown, ICMPv6ParamProblem,\
+        ICMPv6TimeExceeded, IPv6, IPv6ExtHdrFragment, IPv6ExtHdrHopByHop
 from framework import VppTestCase, VppTestRunner
 from util import ppp, ppc, fragment_rfc791, fragment_rfc8200
 from vpp_gre_interface import VppGreInterface
@@ -818,6 +818,23 @@ class TestIPv6Reassembly(VppTestCase):
         self.verify_capture(packets)
         self.src_if.assert_nothing_captured()
 
+    def test_buffer_boundary(self):
+        """ fragment header crossing buffer boundary """
+
+        p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
+             IPv6(src=self.src_if.remote_ip6,
+                  dst=self.src_if.local_ip6) /
+             IPv6ExtHdrHopByHop(
+                 options=[HBHOptUnknown(otype=0xff, optlen=0)] * 1000) /
+             IPv6ExtHdrFragment(m=1) /
+             UDP(sport=1234, dport=5678) /
+             Raw())
+        self.pg_enable_capture()
+        self.src_if.add_stream([p])
+        self.pg_start()
+        self.src_if.assert_nothing_captured()
+        self.dst_if.assert_nothing_captured()
+
     def test_reversed(self):
         """ reverse order reassembly """