map: BR rule lookup update

Update to the MAP rule lookup (in IPv6) based on the rule's source
prefix instead of DMR

Type: improvement

Per RFC, the DMR is allowed to serve multiple MAP Basic Mapping Rules, but this
capability was prevented by the above logic.

Updates to the code include populating a new hash table based on the MAP rule
ip6 prefix and length, changing several functions to reference this new table,
and slight alterations to a few functions regarding pre-lookup bitmasking.

All changes are commented with [dgeist] and are in need of peer review,
especially the bitmask alterations.

An attempt was made at generating an additonal MAP rule in the test_map_br test
harness, but the coding appears very much oriented towards testing just one
rule. I would appreciate suggestions on how to test multi-rule cases.

Issue: VPP-2111
Change-Id: Id1fea280eba625e23cd893575d9b63aac7f48405
Signed-off-by: Dan Geist <dan@polter.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/plugins/map/map.h b/src/plugins/map/map.h
index d874aa47b3a..86b8ec22df4 100644
--- a/src/plugins/map/map.h
+++ b/src/plugins/map/map.h
@@ -335,7 +335,11 @@ ip6_map_get_domain (ip6_address_t * addr, u32 * map_domain_index, u8 * error)
 {
   map_main_t *mm = &map_main;
   u32 mdi =
-    mm->ip6_src_prefix_tbl->lookup (mm->ip6_src_prefix_tbl, addr, 128);
+    /* This is the old src (ip6 destination) hash lookup [dgeist]
+     *
+     * mm->ip6_src_prefix_tbl->lookup (mm->ip6_src_prefix_tbl, addr, 128);
+     */
+    mm->ip6_prefix_tbl->lookup (mm->ip6_prefix_tbl, addr, 128);
   if (mdi == ~0)
     {
       *error = MAP_ERROR_NO_DOMAIN;