bgpd: Modify the BGP to zebra route announcement to support multipath
routes. Use a growable buffer (bgp_nexthop_buf) to collect nexthops
that are included in the announcement. Use the BGP_INFO_MULTIPATH_CHG
flag to trigger zebra announcement so zebra will be updated if the
multipath set changes. Display all multipath nexthops in
'debug bgp zebra' output.
* bgpd/bgp_main.c
* bgp_exit(): Free bgp_nexthop_buf when exiting
* bgpd/bgp_route.c
* bgp_process_rsclient(): Clear BGP_INFO_MULTIPATH_CHG after processing
* bgp_process_main(): Check BGP_INFO_MULTIPATH_CHG to trigger zebra
announcement and clear aftr processing
* bgpd/bgp_zebra.c
* bgp_nexthop_buf: Growable buffer used to collect nexthops for zebra
announcement
* bgp_zebra_announce(): Grow bgp_nexthop_buf if needed. Include
multipath count in zebra announcement and add all nexthops to
bgp_nexthop_buf. Pass bgp_nexthop_buf data to zebra announcement.
Added nexthops to debug output.
* bgp_zebra_init(): Initialize bgp_nexthop_buf at startup
* bgpd/bgp_zebra.h
* BGP_NEXTHOP_BUF_SIZE: Default initial bgp_nexthop_buf size has room
for 8 nexthops
diff --git a/bgpd/bgp_main.c b/bgpd/bgp_main.c
index 1a460c6..e5fa79d 100644
--- a/bgpd/bgp_main.c
+++ b/bgpd/bgp_main.c
@@ -35,6 +35,7 @@
#include "routemap.h"
#include "filter.h"
#include "plist.h"
+#include "stream.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_attr.h"
@@ -47,6 +48,7 @@
#include "bgpd/bgp_clist.h"
#include "bgpd/bgp_debug.h"
#include "bgpd/bgp_filter.h"
+#include "bgpd/bgp_zebra.h"
/* bgpd options, we use GNU getopt library. */
static const struct option longopts[] =
@@ -293,6 +295,8 @@
zclient_free (zclient);
if (zlookup)
zclient_free (zlookup);
+ if (bgp_nexthop_buf)
+ stream_free (bgp_nexthop_buf);
/* reverse bgp_master_init */
if (master)