do not decode ipv6 fragments after the 1st fragment

kbandla · May 31, 2021 · 7396677 · 7396677
1 parent 8a79add
commit 7396677
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/dpkt/ip6.py b/dpkt/ip6.py
@@ -91,6 +91,12 @@ def unpack(self, buf):
         if next_ext_hdr is not None:
             self.p = next_ext_hdr
 
+        # do not decode fragments after the first fragment
+        # https://github.com/kbandla/dpkt/issues/575
+        if self.nxt == 44 and ext.frag_off > 0:  # 44 = IP_PROTO_FRAGMENT
+            self.data = buf
+            return
+
         try:
             self.data = self._protosw[next_ext_hdr](buf)
             setattr(self, self.data.__class__.__name__.lower(), self.data)