IPv6 mobility: Fix two message header lengths

From 12 to 16.

RFC 3775 (and RFC 6275) states:

6.1.1.  Format
   ...
   Header Len

      8-bit unsigned integer, representing the length of the Mobility
      Header in units of 8 octets, excluding the first 8 octets.

      The length of the Mobility Header MUST be a multiple of 8 octets.

6.1.7.  Binding Update Message
   ...
   If no options are present in this message, 4 octets of padding are
   necessary and the Header Len field will be set to 1.

6.1.8.  Binding Acknowledgement Message
   ...
   If no options are present in this message, 4 octets of padding are
   necessary and the Header Len field will be set to 1.

Update a test output accordingly.

Author: fxlb

print-mobility.c

@@ -90,8 +90,8 @@ static const unsigned ip6m_hdrlen[IP6M_MAX + 1] = {
 	IP6M_MINLEN + 8,  /* IP6M_CAREOF_TEST_INIT */
 	IP6M_MINLEN + 16, /* IP6M_HOME_TEST        */
 	IP6M_MINLEN + 16, /* IP6M_CAREOF_TEST      */
-	IP6M_MINLEN + 4,  /* IP6M_BINDING_UPDATE   */
-	IP6M_MINLEN + 4,  /* IP6M_BINDING_ACK      */
+	IP6M_MINLEN + 8,  /* IP6M_BINDING_UPDATE   */
+	IP6M_MINLEN + 8,  /* IP6M_BINDING_ACK      */
 	IP6M_MINLEN + 16, /* IP6M_BINDING_ERROR    */
 };
 

tests/cve2015-0261-ipv6.out

@@ -1,2 +1,2 @@
     1  2002-12-31 13:55:31.300000 IP6 [header+payload length 26510 > length 185] (invalid) (class 0x76, flowlabel 0x76767, hlim 103, next-header Mobility (135), payload length 26470) 6767:6767:6767:6767:6767:6767:6767:6767 > 6767:6767:6767:6767:6767:6767:6767:6705: mobility: (payload protocol 255 should be 59) BU seq#=26471 HL lifetime=105884(type-0x67: len=103) [|mobility]
-    2  2003-03-06 15:21:11.300000 IP6 [header+payload length 26510 > length 185] (invalid) (class 0x76, flowlabel 0x76767, hlim 103, next-header Mobility (135), payload length 26470) 6767:6767:6767:6767:6767:6767:6767:6767 > 6767:6767:4f67:6767:6767:6767:6767:6767: mobility: (payload protocol 0 should be 59) BA (header length 8 < 12) (invalid)
+    2  2003-03-06 15:21:11.300000 IP6 [header+payload length 26510 > length 185] (invalid) (class 0x76, flowlabel 0x76767, hlim 103, next-header Mobility (135), payload length 26470) 6767:6767:6767:6767:6767:6767:6767:6767 > 6767:6767:4f67:6767:6767:6767:6767:6767: mobility: (payload protocol 0 should be 59) BA (header length 8 < 16) (invalid)