bgpd: Adds equal-paths check to path comparison. Paths that are

equal to the best path are accumulated onto an ordered list (mp_list)
if maximum-paths is configured. A future commit will add the
multipath markup to the BGP rib table based on the mp_list. Add
unit test for the added mp_list functions.

Deterministic MED is not supported in this commit, it will be
added later.

* bgpd/bgp_aspath.c
  * Make aspath_cmp() an external symbol so it can be used in
    equivalent paths check
* bgpd/bgp_aspath.h
  * Add extern declaration of aspath_cmp()
* bgpd/bgp_mpath.c
  * bgp_info_nexthop_cmp(): Compares nexthops of two paths
  * bgp_info_mpath_cmp(): Compare function to order multipaths by
    nexthop and then by peer address
  * bgp_mp_list_init(): Initialize a list with the multipath order function
  * bgp_mp_list_clear(): Clear out the mp_list
  * bgp_mp_list_add(): Add a multipath to mp_list
* bgpd/bgp_mpath.h
  * External declarations for above added functions in bgp_mpath.c
* bgpd/bgp_route.c
  * bgp_info_cmp(): Add equivalent paths result (paths_eq). If eBGP
    paths are equal down to IGP metric check, flag as equal if peer AS
    matches. Similarly for iBGP paths but compare full AS_PATH.
  * bgp_best_selection(): If multipath is enabled, accumulate equivalent paths
    in mp_list. Add debug bgp event output to see result (will be filtered
    later to display only when change occurs)
  * bgp_process_rsclient(): Pass multipath config to bgp_best_selection()
  * bgp_process_main(): Pass multipath config to bgp_best_selection()
* tests/bgp_mpath_test.c
  * Add unit test case for bgp_mp_list functions

1 files changed, 1 insertions, 1 deletions

diff --git a/bgpd/bgp_aspath.c b/bgpd/bgp_aspath.c
index cf930427..de0d6876 100644
--- a/bgpd/bgp_aspath.c
+++ b/bgpd/bgp_aspath.c
@@ -1821,7 +1821,7 @@ aspath_key_make (void *p)
 }
 
 /* If two aspath have same value then return 1 else return 0 */
-static int
+int
 aspath_cmp (const void *arg1, const void *arg2)
 {
   const struct assegment *seg1 = ((const struct aspath *)arg1)->segments;