OSPFv3: add crypto authentication (RFC6506) support

* Update ospf6_print() to distinguish packet length and OSPFv3 data
  length.
* Fix ospf6_print_lshdr(), ospf6_print_lsa() and ospf6_decode_v3() to
  print the variable-sized part of DBDesc, LS-Upd and LS-Ack packets
  with the declared length of the OSPFv3 data in mind.
* Implement as little LLS decoding in ospf6_print_lls() as necessary to
  indicate and skip an LLS data block.
* Implement normal AT decoding in ospf6_decode_at().
* Add ospf6_decode_v3_trailer() to couple the above with ospf6_print().

This commit doesn't include a sample capture as the only existing RFC6506
implementation is not yet ready to serve as a reference.

1 files changed, 2 insertions, 0 deletions

diff --git a/ospf.h b/ospf.h
index b86458ba..3ce0d329 100644
--- a/ospf.h
+++ b/ospf.h
@@ -137,6 +137,8 @@
 #define	MCLA_VERTEX_NETWORK	2
 
 /* Link-Local-Signaling */
+#define OSPF_LLS_HDRLEN         4U /* RFC5613 Section 2.2 */
+
 #define OSPF_LLS_EO             1  /* RFC4811, RFC4812 */
 #define OSPF_LLS_MD5            2  /* RFC4813 */