Proto: Adding a list of associated neighbors

This makes for safer and faster pruning and notifying as protocol now on
its shutdown prunes only its neighbors and nothing else.

nest/iface.h

@@ -10,6 +10,7 @@
 #define _BIRD_IFACE_H_
 
 #include "lib/lists.h"
+#include "lib/tlists.h"
 #include "lib/ip.h"
 
 extern list iface_list;
@@ -126,6 +127,7 @@ void if_recalc_all_preferred_addresses(void);
 typedef struct neighbor {
   node n;				/* Node in neighbor hash table chain */
   node if_n;				/* Node in per-interface neighbor list */
+  TLIST_NODE(proto_neigh, struct neighbor) proto_n;
   ip_addr addr;				/* Address of the neighbor */
   struct ifa *ifa;			/* Ifa on related iface */
   struct iface *iface;			/* Interface it's connected to */
@@ -138,6 +140,13 @@ typedef struct neighbor {
 					   SCOPE_HOST when it's our own address */
 } neighbor;
 
+#define TLIST_PREFIX proto_neigh
+#define TLIST_TYPE struct neighbor
+#define TLIST_ITEM proto_n
+#define TLIST_WANT_WALK
+#define TLIST_WANT_ADD_TAIL
+#include "lib/tlists.h"
+
 #define NEF_STICKY	1
 #define NEF_ONLINK	2
 #define NEF_IFACE	4		/* Entry for whole iface */
@@ -147,7 +156,7 @@ neighbor *neigh_find(struct proto *p, ip_addr a, struct iface *ifa, uint flags);
 
 void neigh_dump(neighbor *);
 void neigh_dump_all(void);
-void neigh_prune(void);
+void neigh_prune(struct proto *);
 void neigh_if_up(struct iface *);
 void neigh_if_down(struct iface *);
 void neigh_if_link(struct iface *);

nest/neighbor.c

@@ -256,6 +256,7 @@ neigh_find(struct proto *p, ip_addr a, struct iface *iface, uint flags)
   n = sl_allocz(neigh_slab);
   add_tail(&neigh_hash_table[h], &n->n);
   add_tail((scope >= 0) ? &iface->neighbors : &sticky_neigh_list, &n->if_n);
+  proto_neigh_add_tail(&p->neighbors, n);
   n->addr = a;
   n->ifa = addr;
   n->iface = iface;
@@ -308,7 +309,7 @@ neigh_dump_all(void)
 static inline void
 neigh_notify(neighbor *n)
 {
-  if (n->proto->neigh_notify && (n->proto->proto_state != PS_STOP))
+  if (n->proto && n->proto->neigh_notify && (n->proto->proto_state != PS_STOP))
     n->proto->neigh_notify(n);
 }
 
@@ -343,8 +344,12 @@ neigh_down(neighbor *n)
 static inline void
 neigh_free(neighbor *n)
 {
+  proto_neigh_rem_node(&n->proto->neighbors, n);
+  n->proto = NULL;
+
   rem_node(&n->n);
   rem_node(&n->if_n);
+
   sl_free(n);
 }
 
@@ -519,15 +524,6 @@ neigh_ifa_down(struct ifa *a)
       neigh_update(n, i);
 }
 
-static inline void
-neigh_prune_one(neighbor *n)
-{
-  if (n->proto->proto_state != PS_DOWN)
-    return;
-
-  neigh_free(n);
-}
-
 /**
  * neigh_prune - prune neighbor cache
  *
@@ -536,16 +532,10 @@ neigh_prune_one(neighbor *n)
  * is shut down to get rid of all its heritage.
  */
 void
-neigh_prune(void)
+neigh_prune(struct proto *p)
 {
-  neighbor *n;
-  node *m;
-  int i;
-
-  DBG("Pruning neighbors\n");
-  for(i=0; i<NEIGH_HASH_SIZE; i++)
-    WALK_LIST_DELSAFE(n, m, neigh_hash_table[i])
-      neigh_prune_one(n);
+  while (!EMPTY_TLIST(proto_neigh, &p->neighbors))
+    neigh_free(THEAD(proto_neigh, &p->neighbors));
 }
 
 /**

nest/proto.c

@@ -1877,7 +1877,7 @@ static void
 proto_do_down(struct proto *p)
 {
   p->down_code = 0;
-  neigh_prune();
+  neigh_prune(p);
   rfree(p->pool);
   p->pool = NULL;
 

nest/protocol.h

@@ -9,9 +9,10 @@
 #ifndef _BIRD_PROTOCOL_H_
 #define _BIRD_PROTOCOL_H_
 
-#include "lib/lists.h"
+#include "lib/tlists.h"
 #include "lib/resource.h"
 #include "lib/event.h"
+#include "nest/iface.h"
 #include "nest/route.h"
 #include "conf/conf.h"
 
@@ -169,6 +170,7 @@ struct proto {
   struct channel *main_channel;		/* Primary channel */
   struct rte_src *main_source;		/* Primary route source */
   struct iface *vrf;			/* Related VRF instance, NULL if global */
+  TLIST_LIST(proto_neigh) neighbors;	/* List of neighbor structures */
 
   const char *name;			/* Name of this instance (== cf->name) */
   u32 debug;				/* Debugging flags */