From e0a62ad0f8be198bf8afb1f6900f138dfe12d4fb Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Wed, 26 May 2010 12:32:30 +0200
Subject: Fixes a bug in duplicit configured stubnets.

If there was the same configured stubnet on local and remote
router, the remote route always won regardless of its cost.
---
 proto/ospf/rt.c | 18 ++++++++++++------
 proto/ospf/rt.h |  4 +++-
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/proto/ospf/rt.c b/proto/ospf/rt.c
index 944d0e5..892aa41 100644
--- a/proto/ospf/rt.c
+++ b/proto/ospf/rt.c
@@ -244,14 +244,12 @@ add_network(struct ospf_area *oa, ip_addr px, int pxlen, int metric, struct top_
      * Local stub networks does not have proper iface in en->nhi
      * (because they all have common top_hash_entry en).
      * We have to find iface responsible for that stub network.
-     * Some stubnets does not have any iface. Ignore them.
+     * Configured stubnets does not have any iface. They will
+     * be removed in rt_sync().
      */
 
     nf.ifa = find_stub_src(oa, px, pxlen);
     nf.nh = IPA_NONE;
-
-    if (!nf.ifa)
-      return;
   }
 
   ri_install_net(oa->po, px, pxlen, &nf);
@@ -813,7 +811,7 @@ decide_sum_lsa(struct ospf_area *oa, ort *nf, int dest)
     return 0;
 
   /* 12.4.3 p4 */
-  if (nf->n.ifa->oa->areaid == oa->areaid)
+  if (nf->n.ifa && (nf->n.ifa->oa->areaid == oa->areaid))
     return 0;
 
   /* 12.4.3 p5 */
@@ -961,7 +959,7 @@ ospf_rt_abr(struct proto_ospf *po)
 
 
     /* RFC 2328 G.3 - incomplete resolution of virtual next hops */
-    if (nf->n.type && (nf->n.ifa->type == OSPF_IT_VLINK))
+    if (nf->n.type && nf->n.ifa && (nf->n.ifa->type == OSPF_IT_VLINK))
       reset_ri(&nf->n);
 
 
@@ -1153,6 +1151,10 @@ ospf_ext_spf(struct proto_ospf *po)
       if ((nf2->n.type != RTS_OSPF) && (nf2->n.type != RTS_OSPF_IA))
 	continue;
 
+      /* Next-hop is a part of a configured stubnet */
+      if (!nf2->n.ifa)
+	continue;
+
       /* If nh is zero, it is a device route */
       nh = ipa_nonzero(nf2->n.nh) ? nf2->n.nh : rt_fwaddr;
       nhi = nf2->n.ifa;
@@ -1539,6 +1541,10 @@ again1:
     if (po->areano > 1)
       check_sum_net_lsa(po, nf);
 
+    /* Remove configured stubnets */
+    if (!nf->n.ifa)
+      reset_ri(&nf->n);
+
     if (reload || memcmp(&nf->n, &nf->o, sizeof(orta)))
     {
       net *ne = net_get(p->table, nf->fn.prefix, nf->fn.pxlen);
diff --git a/proto/ospf/rt.h b/proto/ospf/rt.h
index 4fc76f4..78156c7 100644
--- a/proto/ospf/rt.h
+++ b/proto/ospf/rt.h
@@ -72,7 +72,9 @@ ort;
  * - nodes may be invalid (fn.type == 0), in that case other invariants don't hold
  * - n.metric1 may be at most a small multiple of LSINFINITY,
  *   therefore sums do not overflow
- * - n.oa and n.ifa are always non-NULL
+ * - n.oa is always non-NULL
+ * - n.ifa is always non-NULL with one exception - configured stubnet
+     nodes (in po->rtf). In that case, n.nh is IFA_NONE.
  * - oa->rtr does not contain calculating router itself
  */
 
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