Temporary OSPFv3 development commit.

Finally, it is working.

12 files changed, 135 insertions, 63 deletions

diff --git a/lib/ipv4.h b/lib/ipv4.h
index b64d9b2a..5c8c3907 100644
--- a/lib/ipv4.h
+++ b/lib/ipv4.h
@@ -54,6 +54,7 @@ typedef u32 ip_addr;
 #define ipa_hton(x) x = _MI(htonl(_I(x)))
 #define ipa_ntoh(x) x = _MI(ntohl(_I(x)))
 #define ipa_classify(x) ipv4_classify(_I(x))
+#define ipa_has_link_scope(x) ipv4_has_link_scope(_I(x))
 #define ipa_opposite(x,len) _MI(_I(x) ^ (len == 30 ? 3 : 1))
 #define ipa_class_mask(x) _MI(ipv4_class_mask(_I(x)))
 #define ipa_from_u32(x) _MI(x)
@@ -69,6 +70,11 @@ int ipv4_classify(u32);
 u32 ipv4_class_mask(u32);
 byte *ipv4_skip_header(byte *, int *);
 
+static inline int ipv4_has_link_scope(u32 a)
+{
+  return 0;
+}
+
 static inline unsigned ipv4_hash(u32 a)
 {
   /* Returns a 16-bit value */
diff --git a/lib/ipv6.h b/lib/ipv6.h
index 592e57c7..53888ff0 100644
--- a/lib/ipv6.h
+++ b/lib/ipv6.h
@@ -60,6 +60,7 @@ typedef struct ipv6_addr {
 #define ipa_hton(x) ipv6_hton(&(x))
 #define ipa_ntoh(x) ipv6_ntoh(&(x))
 #define ipa_classify(x) ipv6_classify(&(x))
+#define ipa_has_link_scope(x) ipv6_has_link_scope(&(x))
 /* ipa_opposite and ipa_class_mask don't make sense with IPv6 */
 /* ipa_from_u32 and ipa_to_u32 replaced by ipa_build */
 #define ipa_build(a,b,c,d) _MI(a,b,c,d)
@@ -81,6 +82,11 @@ int ipv6_compare(ip_addr, ip_addr);
 int ipv4_pton_u32(char *, u32 *);
 void ipv6_absolutize(ip_addr *, ip_addr *);
 
+static inline int ipv6_has_link_scope(ip_addr *a)
+{
+  return ((a->addr[0] & 0xffc00000) == 0xfe800000);
+}
+
 /*
  *  This hash function looks well, but once IPv6 enters
  *  mainstream use, we need to check that it has good
diff --git a/nest/iface.h b/nest/iface.h
index af98a761..a982c17f 100644
--- a/nest/iface.h
+++ b/nest/iface.h
@@ -99,6 +99,7 @@ typedef struct neighbor {
 #define NEF_STICKY 1
 
 neighbor *neigh_find(struct proto *, ip_addr *, unsigned flags);
+neighbor *neigh_find2(struct proto *p, ip_addr *a, struct iface *ifa, unsigned flags);
 
 static inline int neigh_connected_to(struct proto *p, ip_addr *a, struct iface *i)
 {
diff --git a/nest/neighbor.c b/nest/neighbor.c
index 7aaf8d72..a44667f5 100644
--- a/nest/neighbor.c
+++ b/nest/neighbor.c
@@ -100,21 +100,21 @@ if_connected(ip_addr *a, struct iface *i) /* -1=error, 1=match, 0=no match */
  * IP address, neigh_find() returns %NULL.
  */
 
-/*
+
 neighbor *
 neigh_find(struct proto *p, ip_addr *a, unsigned flags)
 {
   return neigh_find2(p, a, NULL, flags);
 }
-*/
+
 
 neighbor *
-neigh_find(struct proto *p, ip_addr *a, unsigned flags)
+neigh_find2(struct proto *p, ip_addr *a, struct iface *ifa, unsigned flags)
 {
   neighbor *n;
   int class, scope = SCOPE_HOST;
   unsigned int h = neigh_hash(p, a);
-  struct iface *i, *j;
+  struct iface *i;
 
   WALK_LIST(n, neigh_hash_table[h])	/* Search the cache */
     if (n->proto == p && ipa_equal(*a, n->addr))
@@ -123,27 +123,31 @@ neigh_find(struct proto *p, ip_addr *a, unsigned flags)
   class = ipa_classify(*a);
   if (class < 0)			/* Invalid address */
     return NULL;
-  if ((class & IADDR_SCOPE_MASK) < SCOPE_SITE ||
+  if (((class & IADDR_SCOPE_MASK) == SCOPE_HOST) ||
+      (((class & IADDR_SCOPE_MASK) == SCOPE_LINK) && (ifa == NULL)) ||
       !(class & IADDR_HOST))
     return NULL;			/* Bad scope or a somecast */
 
-  j = NULL;
-  WALK_LIST(i, iface_list)
-    if ((scope = if_connected(a, i)) >= 0)
-      {
-	j = i;
-	break;
-      }
-  if (!j && !(flags & NEF_STICKY))
+  if (ifa)
+    scope = if_connected(a, ifa);
+  else
+    WALK_LIST(i, iface_list)
+      if ((scope = if_connected(a, i)) >= 0)
+	{
+	  ifa = i;
+	  break;
+	}
+
+  if (!ifa && !(flags & NEF_STICKY))
     return NULL;
 
   n = sl_alloc(neigh_slab);
   n->addr = *a;
-  n->iface = j;
-  if (j)
+  n->iface = ifa;
+  if (ifa)
     {
       add_tail(&neigh_hash_table[h], &n->n);
-      add_tail(&j->neighbors, &n->if_n);
+      add_tail(&ifa->neighbors, &n->if_n);
     }
   else
     {
diff --git a/proto/ospf/iface.c b/proto/ospf/iface.c
index fc1cf2a2..9b65961d 100644
--- a/proto/ospf/iface.c
+++ b/proto/ospf/iface.c
@@ -381,6 +381,7 @@ ospf_iface_add(struct object_lock *lock)
 
   ifa->state = OSPF_IS_DOWN;
   ospf_iface_sm(ifa, ISM_UP);
+  schedule_link_lsa(ifa);
 }
 
 void
diff --git a/proto/ospf/lsalib.c b/proto/ospf/lsalib.c
index 8442882c..31b51189 100644
--- a/proto/ospf/lsalib.c
+++ b/proto/ospf/lsalib.c
@@ -462,9 +462,7 @@ lsa_install_new(struct proto_ospf *po, struct ospf_lsa_header *lsa, u32 domain,
   en->ini_age = en->lsa.age;
 
   if (change)
-  {
     schedule_rtcalc(po);
-  }
 
   return en;
 }
diff --git a/proto/ospf/lsupd.c b/proto/ospf/lsupd.c
index bccdba82..cb794617 100644
--- a/proto/ospf/lsupd.c
+++ b/proto/ospf/lsupd.c
@@ -627,6 +627,13 @@ ospf_lsupd_receive(struct ospf_packet *ps_i, struct ospf_iface *ifa,
       lsadb = lsa_install_new(po, &lsatmp, domain, body);
       DBG("New LSA installed in DB\n");
 
+#ifdef OSPFv3
+      /* Events 6,7 from 4.4.3. */
+      if ((lsatmp.type == LSA_T_LINK) &&
+	  (ifa->state == OSPF_IS_DR))
+	schedule_net_lsa(ifa);
+#endif
+
       continue;
     }
 
diff --git a/proto/ospf/ospf.c b/proto/ospf/ospf.c
index 438e9a54..dafb607e 100644
--- a/proto/ospf/ospf.c
+++ b/proto/ospf/ospf.c
@@ -307,15 +307,29 @@ ospf_build_attrs(ea_list * next, struct linpool *pool, u32 m1, u32 m2,
 void
 schedule_net_lsa(struct ospf_iface *ifa)
 {
+  struct proto *p = &ifa->oa->po->proto;
+
+  OSPF_TRACE(D_EVENTS, "Scheduling network-LSA origination for iface %s", ifa->iface->name);
   ifa->orignet = 1;
 }
 
+#ifdef OSPFv3
+void
+schedule_link_lsa(struct ospf_iface *ifa)
+{
+  struct proto *p = &ifa->oa->po->proto;
+
+  OSPF_TRACE(D_EVENTS, "Scheduling link-LSA origination for iface %s", ifa->iface->name);
+  ifa->origlink = 1;
+}
+#endif
+
 void
 schedule_rt_lsa(struct ospf_area *oa)
 {
   struct proto *p = &oa->po->proto;
 
-  OSPF_TRACE(D_EVENTS, "Scheduling RT lsa origination for area %R.", oa->areaid);
+  OSPF_TRACE(D_EVENTS, "Scheduling router-LSA origination for area %R", oa->areaid);
   oa->origrt = 1;
 }
 
@@ -327,7 +341,7 @@ schedule_rtcalc(struct proto_ospf *po)
   if (po->calcrt)
     return;
 
-  OSPF_TRACE(D_EVENTS, "Scheduling RT calculation.");
+  OSPF_TRACE(D_EVENTS, "Scheduling routing table calculation");
   po->calcrt = 1;
 }
 
@@ -353,6 +367,7 @@ area_disp(struct ospf_area *oa)
   WALK_LIST(ifa, po->iface_list)
   {
 #ifdef OSPFv3
+    /* Link LSA should be originated before Network LSA */
     if (ifa->origlink && (ifa->oa == oa))
       update_link_lsa(ifa);
 #endif
@@ -478,6 +493,7 @@ ospf_ifa_notify(struct proto *p, unsigned flags, struct ifa *a)
       if (ifa->iface == a->iface)
 	{
 	  schedule_rt_lsa(ifa->oa);
+	  schedule_link_lsa(ifa);
 	  return;
 	}
     }
diff --git a/proto/ospf/ospf.h b/proto/ospf/ospf.h
index ae073dd5..4bcb7a0e 100644
--- a/proto/ospf/ospf.h
+++ b/proto/ospf/ospf.h
@@ -232,8 +232,8 @@ struct ospf_iface
   struct top_hash_entry *net_lsa;	/* Originated network LSA */
   int orignet;				/* Schedule network LSA origination */
 #ifdef OSPFv3
-  struct top_hash_entry *link_lsa;	/* Originated link LSA */
   int origlink;				/* Schedule link LSA origination */
+  struct top_hash_entry *link_lsa;	/* Originated link LSA */
   struct top_hash_entry *pxn_lsa;	/* Originated prefix LSA */
 #endif
   int fadj;				/* Number of full adjacent neigh */
@@ -734,6 +734,13 @@ void ospf_store_tmp_attrs(struct rte *rt, struct ea_list *attrs);
 void schedule_rt_lsa(struct ospf_area *oa);
 void schedule_rtcalc(struct proto_ospf *po);
 void schedule_net_lsa(struct ospf_iface *ifa);
+
+#ifdef OSPFv3
+void schedule_link_lsa(struct ospf_iface *ifa);
+#else
+static inline void schedule_link_lsa(struct ospf_iface *ifa) {}
+#endif
+
 void ospf_sh_neigh(struct proto *p, char *iff);
 void ospf_sh(struct proto *p);
 void ospf_sh_iface(struct proto *p, char *iff);
diff --git a/proto/ospf/rt.c b/proto/ospf/rt.c
index 0f6efd78..9d3aea0a 100644
--- a/proto/ospf/rt.c
+++ b/proto/ospf/rt.c
@@ -321,7 +321,6 @@ ospf_rt_spfa(struct ospf_area *oa)
 	}
 
       rr = (struct ospf_lsa_rt_link *) (rt + 1);
-      DBG("  Number of links: %u\n", rt->links);
       for (i = 0; i < lsa_rt_count(&act->lsa); i++)
       {
 	tmp = NULL;
@@ -1178,7 +1177,7 @@ again1:
       if (nf->n.ifa) a0.iface = nf->n.ifa->iface;
       a0.gw = nf->n.nh;
 
-      if ((!ipa_equal(nf->n.nh, IPA_NONE)) && (!neigh_find(p, &nf->n.nh, 0)))
+      if (ipa_nonzero(nf->n.nh) && (!neigh_find2(p, &nf->n.nh, nf->n.ifa->iface, 0)))
       {
         int found = 0;
         struct ospf_iface *ifa;
diff --git a/proto/ospf/topology.c b/proto/ospf/topology.c
index 8f64c4ca..cadf4eaa 100644
--- a/proto/ospf/topology.c
+++ b/proto/ospf/topology.c
@@ -168,9 +168,6 @@ originate_rt_lsa_body(struct ospf_area *oa, u16 *length)
   struct ospf_lsa_rt_link *ln;
   struct ospf_neighbor *neigh;
 
-  DBG("%s: Originating RT_lsa body for area %R.\n", po->proto.name,
-      oa->areaid);
-    
   ASSERT(po->lsab_used == 0);
   rt = lsab_allocz(po, sizeof(struct ospf_lsa_rt));
 
@@ -322,9 +319,6 @@ originate_rt_lsa_body(struct ospf_area *oa, u16 *length)
   struct ospf_lsa_rt *rt;
   struct ospf_neighbor *neigh;
 
-  DBG("%s: Originating RT_lsa body for area %R.\n", po->proto.name,
-      oa->areaid);
-  
   ASSERT(po->lsab_used == 0);
   rt = lsab_allocz(po, sizeof(struct ospf_lsa_rt));
 
@@ -411,7 +405,7 @@ originate_rt_lsa(struct ospf_area *oa)
   u32 rid = po->proto.cf->global->router_id;
   void *body;
 
-  OSPF_TRACE(D_EVENTS, "Originating RT_lsa for area %R.", oa->areaid);
+  OSPF_TRACE(D_EVENTS, "Originating router-LSA for area %R", oa->areaid);
 
   lsa.age = 0;
   lsa.type = LSA_T_RT;
@@ -522,7 +516,7 @@ originate_net_lsa(struct ospf_iface *ifa)
   struct proto *p = &po->proto;
   void *body;
 
-  OSPF_TRACE(D_EVENTS, "Originating Net lsa for iface \"%s\".",
+  OSPF_TRACE(D_EVENTS, "Originating network-LSA for iface %s",
 	     ifa->iface->name);
 
   lsa.age = 0;
@@ -554,7 +548,7 @@ flush_net_lsa(struct ospf_iface *ifa)
   if (ifa->net_lsa == NULL)
     return;
 
-  OSPF_TRACE(D_EVENTS, "Deleting Net lsa for iface \"%s\".",
+  OSPF_TRACE(D_EVENTS, "Flushing network-LSA for iface %s",
 	     ifa->iface->name);
   ifa->net_lsa->lsa.sn += 1;
   ifa->net_lsa->lsa.age = LSA_MAXAGE;
@@ -685,14 +679,14 @@ originate_sum_lsa(struct ospf_area *oa, struct fib_node *fn, int type, int metri
 
   if (type == ORT_NET)
     {
-      OSPF_TRACE(D_EVENTS, "Originating Net-Summary-LSA for %I/%d (metric %d).",
+      OSPF_TRACE(D_EVENTS, "Originating summary-LSA for %I/%d (metric %d)",
 		 fn->prefix, fn->pxlen, metric);
 
       body = originate_sum_net_lsa_body(po, &lsa.length, fn, metric);
     }
   else
     {
-      OSPF_TRACE(D_EVENTS, "Originating RT-Summary-LSA for %R (metric %d).",
+      OSPF_TRACE(D_EVENTS, "Originating summary-LSA for %R (metric %d)",
 		 lsa.id, metric);
 
       body = originate_sum_rt_lsa_body(po, &lsa.length, lsa.id, metric, options);
@@ -734,7 +728,7 @@ flush_sum_lsa(struct ospf_area *oa, struct fib_node *fn, int type)
       en->lsa.sn = LSA_MAXSEQNO;
       lsasum_calculate(&en->lsa, sum);
 
-      OSPF_TRACE(D_EVENTS, "Flushing summary lsa. (id=%R, type=%d)",
+      OSPF_TRACE(D_EVENTS, "Flushing summary-LSA (id=%R, type=%d)",
 		 en->lsa.id, en->lsa.type);
       ospf_lsupd_flood(po, NULL, NULL, &en->lsa, oa->areaid, 1);
       if (can_flush_lsa(po)) flush_lsa(en, po);
@@ -879,15 +873,15 @@ void
 originate_ext_lsa(net * n, rte * e, struct proto_ospf *po,
 		  struct ea_list *attrs)
 {
+  struct proto *p = &po->proto;
   struct ospf_lsa_header lsa;
   u32 rid = po->proto.cf->global->router_id;
   struct top_hash_entry *en = NULL;
   void *body;
-  struct proto *p = &po->proto;
   struct ospf_area *oa;
 
-  OSPF_TRACE(D_EVENTS, "Originating Ext lsa for %I/%d.", n->n.prefix,
-	     n->n.pxlen);
+  OSPF_TRACE(D_EVENTS, "Originating AS-external-LSA for %I/%d",
+	     n->n.prefix, n->n.pxlen);
 
   lsa.age = 0;
   lsa.type = LSA_T_EXT;
@@ -924,10 +918,14 @@ originate_ext_lsa(net * n, rte * e, struct proto_ospf *po,
 void
 flush_ext_lsa(net *n, struct proto_ospf *po)
 {
+  struct proto *p = &po->proto;
   u32 rid = po->proto.cf->global->router_id;
   struct ospf_area *oa;
   struct top_hash_entry *en;
 
+  OSPF_TRACE(D_EVENTS, "Flushing AS-external-LSA for %I/%d",
+	     n->n.prefix, n->n.pxlen);
+
   /* FIXME proper handling of LSA IDs and check for the same network */
   u32 lsaid = ipa_to_lsaid(n->n.prefix);
 
@@ -987,7 +985,7 @@ originate_link_lsa(struct ospf_iface *ifa)
   void *body;
 
   /* FIXME check for vlink and skip that? */
-  OSPF_TRACE(D_EVENTS, "Originating Link_lsa for iface %s.", ifa->iface->name);
+  OSPF_TRACE(D_EVENTS, "Originating link-LSA for iface %s", ifa->iface->name);
 
   lsa.age = 0;
   lsa.type = LSA_T_LINK;
@@ -1000,6 +998,10 @@ originate_link_lsa(struct ospf_iface *ifa)
   lsasum_calculate(&lsa, body);
   ifa->link_lsa = lsa_install_new(po, &lsa, dom, body);
   ospf_lsupd_flood(po, NULL, NULL, &lsa, dom, 1);
+
+  /* Just to be sure to not forget on our link LSA */
+  if (ifa->state == OSPF_IS_DR)
+    schedule_net_lsa(ifa);
 }
 
 void
@@ -1050,6 +1052,7 @@ originate_prefix_rt_lsa_body(struct ospf_area *oa, u16 *length)
 	if (((a->pxlen < MAX_PREFIX_LENGTH) && net_lsa) ||
 	    (a->flags & IA_SECONDARY) ||
 	    (a->flags & IA_UNNUMBERED) ||
+	    (a->scope <= SCOPE_LINK) ||
 	    configured_stubnet(oa, a))
 	  continue;
 
@@ -1081,14 +1084,17 @@ originate_prefix_rt_lsa_body(struct ospf_area *oa, u16 *length)
 void
 originate_prefix_rt_lsa(struct ospf_area *oa)
 {
-  struct ospf_lsa_header lsa;
   struct proto_ospf *po = oa->po;
+  struct proto *p = &po->proto;  
   u32 rid = po->proto.cf->global->router_id;
+  struct ospf_lsa_header lsa;
   void *body;
 
+  OSPF_TRACE(D_EVENTS, "Originating router prefix-LSA for area %R", oa->areaid);
+
   lsa.age = 0;
   lsa.type = LSA_T_PREFIX;
-  lsa.id = 1 << 31;
+  lsa.id = 0;
   lsa.rt = rid;
   lsa.sn = oa->pxr_lsa ? (oa->pxr_lsa->lsa.sn + 1) : LSA_INITSEQNO;
   u32 dom = oa->areaid;
@@ -1128,12 +1134,14 @@ prefix_same(u32 *b1, u32 *b2)
 static inline u32 *
 prefix_advance(u32 *buf)
 {
-  return buf + prefix_space(buf);
+  int pxl = *buf >> 24;
+  return buf + IPV6_PREFIX_WORDS(pxl);
 }
 
 static void
-add_prefix(struct proto_ospf *po, u32 *px, u32 *pxl, int *pxc)
+add_prefix(struct proto_ospf *po, u32 *px, int offset, int *pxc)
 {
+  u32 *pxl = lsab_offset(po, offset);
   int i;
   for (i = 0; i < *pxc; i++)
     {
@@ -1154,19 +1162,31 @@ add_prefix(struct proto_ospf *po, u32 *px, u32 *pxl, int *pxc)
   (*pxc)++;
 }
 
+static void
+add_link_lsa(struct proto_ospf *po, struct top_hash_entry *en, int offset, int *pxc)
+{
+  struct ospf_lsa_link *ll = en->lsa_body;
+  u32 *pxb = ll->rest;
+  int j;
+
+  for (j = 0; j < ll->pxcount; j++)
+    {
+      add_prefix(po, pxb, offset, pxc);
+      pxb = prefix_advance(pxb);
+    }
+}
+
+
 
 static void *
 originate_prefix_net_lsa_body(struct ospf_iface *ifa, u16 *length)
 {
   struct proto_ospf *po = ifa->oa->po;
   struct ospf_lsa_prefix *lp;
-  struct ospf_lsa_link *ll;
   struct ospf_neighbor *n;
   struct top_hash_entry *en;
   u32 rid = po->proto.cf->global->router_id;
-  u32 *pxb;
-  int i, j, offset;
-
+  int pxc, offset;
 
   ASSERT(po->lsab_used == 0);
   lp = lsab_allocz(po, sizeof(struct ospf_lsa_prefix));
@@ -1175,26 +1195,20 @@ originate_prefix_net_lsa_body(struct ospf_iface *ifa, u16 *length)
   lp->ref_rt = rid;
   lp = NULL; /* buffer might be reallocated later */
 
-  i = 0;
+  pxc = 0;
   offset = po->lsab_used;
 
-  /* Find all Link LSA associated with the link and merge their prefixes */
+  /* Find all Link LSAs associated with the link and merge their prefixes */
+  if (ifa->link_lsa)
+    add_link_lsa(po, ifa->link_lsa, offset, &pxc);
+
   WALK_LIST(n, ifa->neigh_list)
     if ((n->state == NEIGHBOR_FULL) &&
       	(en = ospf_hash_find(po->gr, ifa->iface->index, n->iface_id, n->rid, LSA_T_LINK)))
-      {
-	ll = en->lsa_body;
-	pxb = ll->rest;
-
-	for (j = 0; j < ll->pxcount; j++)
-	  {
-	    add_prefix(po, pxb, lsab_offset(po, offset), &i);
-	    pxb = prefix_advance(pxb);
-	  }
-      }
+      add_link_lsa(po, en, offset, &pxc);
 
   lp = po->lsab;
-  lp->pxcount = i;
+  lp->pxcount = pxc;
   *length = po->lsab_used + sizeof(struct ospf_lsa_header);
   return lsab_flush(po);
 }
@@ -1202,11 +1216,15 @@ originate_prefix_net_lsa_body(struct ospf_iface *ifa, u16 *length)
 void
 originate_prefix_net_lsa(struct ospf_iface *ifa)
 {
-  struct ospf_lsa_header lsa;
   struct proto_ospf *po = ifa->oa->po;
+  struct proto *p = &po->proto;
   u32 rid = po->proto.cf->global->router_id;
+  struct ospf_lsa_header lsa;
   void *body;
 
+  OSPF_TRACE(D_EVENTS, "Originating network prefix-LSA for iface %s",
+	     ifa->iface->name);
+
   lsa.age = 0;
   lsa.type = LSA_T_PREFIX;
   lsa.id = ifa->iface->index;
@@ -1231,8 +1249,9 @@ flush_prefix_net_lsa(struct ospf_iface *ifa)
   if (en == NULL)
     return;
 
-  OSPF_TRACE(D_EVENTS, "Flushing Net Prefix lsa for iface \"%s\".",
+  OSPF_TRACE(D_EVENTS, "Flushing network prefix-LSA for iface %s",
 	     ifa->iface->name);
+
   en->lsa.sn += 1;
   en->lsa.age = LSA_MAXAGE;
   lsasum_calculate(&en->lsa, en->lsa_body);
@@ -1283,7 +1302,7 @@ ospf_top_hash_u32(u32 a)
 static inline unsigned
 ospf_top_hash(struct top_graph *f, u32 domain, u32 lsaid, u32 rtrid, u32 type)
 {
-  /* In OSPFv2, we don't know Router ID when looking for network lsas.
+  /* In OSPFv2, we don't know Router ID when looking for network LSAs.
      dirty patch to make rt table calculation work. */
 
   return (ospf_top_hash_u32(lsaid) + type +
diff --git a/sysdep/linux/netlink/netlink.c b/sysdep/linux/netlink/netlink.c
index b7fd479b..0f7b7070 100644
--- a/sysdep/linux/netlink/netlink.c
+++ b/sysdep/linux/netlink/netlink.c
@@ -472,6 +472,9 @@ krt_capable(rte *e)
   switch (a->dest)
     {
     case RTD_ROUTER:
+      if (ipa_has_link_scope(a->gw) && (a->iface == NULL))
+	return 0;
+
     case RTD_DEVICE:
     case RTD_BLACKHOLE:
     case RTD_UNREACHABLE:
@@ -514,6 +517,11 @@ nl_send_route(struct krt_proto *p, rte *e, int new)
     case RTD_ROUTER:
       r.r.rtm_type = RTN_UNICAST;
       nl_add_attr_ipa(&r.h, sizeof(r), RTA_GATEWAY, a->gw);
+
+      /* a->iface != NULL checked in krt_capable() */
+      if (ipa_has_link_scope(a->gw))
+	nl_add_attr_u32(&r.h, sizeof(r), RTA_OIF, a->iface->index);
+
       break;
     case RTD_DEVICE:
       if (!a->iface)