From d9f330c5ffe03c05b7e6541a06adac657f24407b Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Wed, 3 Jun 1998 08:40:10 +0000
Subject: [PATCH] Protocol hooks. All of them may be NULL.

---
 nest/iface.c    | 12 +++++++++---
 nest/rt-attr.c  |  2 +-
 nest/rt-table.c |  9 +++++++--
 3 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/nest/iface.c b/nest/iface.c
index 5342f120..3f21c435 100644
--- a/nest/iface.c
+++ b/nest/iface.c
@@ -130,7 +130,8 @@ neigh_if_up(struct iface *i)
 	n->sibling = i->neigh;
 	i->neigh = n;
 	DBG("Waking up sticky neighbor %08x\n", _I(n->addr));
-	n->proto->neigh_notify(n);
+	if (n->proto->neigh_notify)
+	  n->proto->neigh_notify(n);
       }
 }
 
@@ -144,7 +145,8 @@ neigh_if_down(struct iface *i)
       m = n->sibling;
       DBG("Flushing neighbor %08x on %s\n", _I(n->addr), n->iface->name);
       n->iface = NULL;
-      n->proto->neigh_notify(n);
+      if (n->proto->neigh_notify)
+	n->proto->neigh_notify(n);
       if (!(n->flags & NEF_STICKY))
 	{
 	  rem_node(&n->n);
@@ -241,6 +243,8 @@ if_changed(struct iface *i, struct iface *j)
 static void
 if_notify_change(unsigned c, struct iface *old, struct iface *new)
 {
+  struct proto *p;
+
   debug("Interface change notification (%x) for %s\n", c, new->name);
   if (old)
     if_dump(old);
@@ -250,7 +254,9 @@ if_notify_change(unsigned c, struct iface *old, struct iface *new)
   if (c & IF_CHANGE_UP)
     neigh_if_up(new);
 
-  /* FIXME: Notify protocols here */
+  WALK_LIST(p, proto_list)
+    if (p->if_notify)
+      p->if_notify(p, c, old, new);
 
   if (c & IF_CHANGE_DOWN)
     neigh_if_down(old);
diff --git a/nest/rt-attr.c b/nest/rt-attr.c
index e6676252..5f386a76 100644
--- a/nest/rt-attr.c
+++ b/nest/rt-attr.c
@@ -62,7 +62,7 @@ rta_same(rta *x, rta *y)
 	  ipa_equal(x->from, y->from) &&
 	  x->iface == y->iface &&
 	  ea_same(x->attrs, y->attrs) &&
-	  x->proto->rta_same(x, y));
+	  (!x->proto->rta_same || x->proto->rta_same(x, y)));
 }
 
 static inline ea_list *
diff --git a/nest/rt-table.c b/nest/rt-table.c
index e61e9f20..85d42beb 100644
--- a/nest/rt-table.c
+++ b/nest/rt-table.c
@@ -85,6 +85,8 @@ rte_get_temp(rta *a)
 static int				/* Actually better or at least as good as */
 rte_better(rte *new, rte *old)
 {
+  int (*better)(rte *, rte *);
+
   if (!old)
     return 1;
   if (new->pref > old->pref)
@@ -96,7 +98,9 @@ rte_better(rte *new, rte *old)
       /* FIXME!!! */
       die("Different protocols, but identical preferences => oops");
     }
-  return new->attrs->proto->rte_better(new, old);
+  if (better = new->attrs->proto->rte_better)
+    return better(new, old);
+  return 0;
 }
 
 void
@@ -106,7 +110,8 @@ rte_announce(rte *new, rte *old)
 
   WALK_LIST(p, proto_list)
     if (!new || new->attrs->proto != p)
-      p->rt_notify(p, new, old);
+      if (p->rt_notify)
+	p->rt_notify(p, new, old);
 }
 
 static inline void