BGP graceful restart support.

Also significant core protocol state changes needed for that,
global graceful restart recovery state and kernel proto support
for recovery.

1 files changed, 17 insertions, 0 deletions

diff --git a/nest/route.h b/nest/route.h
index f00f8b2b..82d9e202 100644
--- a/nest/route.h
+++ b/nest/route.h
@@ -148,6 +148,10 @@ typedef struct rtable {
   struct fib_iterator nhu_fit;		/* Next Hop Update FIB iterator */
 } rtable;
 
+#define RPS_NONE	0
+#define RPS_SCHEDULED	1
+#define RPS_RUNNING	2
+
 typedef struct network {
   struct fib_node n;			/* FIB flags reserved for kernel syncer */
   struct rte *routes;			/* Available routes for this network */
@@ -222,6 +226,8 @@ typedef struct rte {
 
 #define REF_COW		1		/* Copy this rte on write */
 #define REF_FILTERED	2		/* Route is rejected by import filter */
+#define REF_STALE	4		/* Route is stale in a refresh cycle */
+#define REF_DISCARD	8		/* Route is scheduled for discard */
 
 /* Route is valid for propagation (may depend on other flags in the future), accepts NULL */
 static inline int rte_is_valid(rte *r) { return r && !(r->flags & REF_FILTERED); }
@@ -257,6 +263,8 @@ void rte_update2(struct announce_hook *ah, net *net, rte *new, struct rte_src *s
 static inline void rte_update(struct proto *p, net *net, rte *new) { rte_update2(p->main_ahook, net, new, p->main_source); }
 void rte_discard(rtable *tab, rte *old);
 int rt_examine(rtable *t, ip_addr prefix, int pxlen, struct proto *p, struct filter *filter);
+void rt_refresh_begin(rtable *t, struct announce_hook *ah);
+void rt_refresh_end(rtable *t, struct announce_hook *ah);
 void rte_dump(rte *);
 void rte_free(rte *);
 rte *rte_do_cow(rte *);
@@ -268,6 +276,15 @@ void rt_feed_baby_abort(struct proto *p);
 int rt_prune_loop(void);
 struct rtable_config *rt_new_table(struct symbol *s);
 
+static inline void
+rt_mark_for_prune(rtable *tab)
+{
+  if (tab->prune_state == RPS_RUNNING)
+    fit_get(&tab->fib, &tab->prune_fit);
+
+  tab->prune_state = RPS_SCHEDULED;
+}
+
 struct rt_show_data {
   ip_addr prefix;
   unsigned pxlen;