From 85a291ff3055f0b10ffc199138c67305f5b3fc98 Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Tue, 2 May 2000 15:21:51 +0000
Subject: IPv6 address classification fixes.

---
 lib/ipv6.c      | 22 +++++++++++++++++-----
 nest/iface.c    |  2 ++
 nest/rt-table.c | 16 ++++++++++++----
 3 files changed, 31 insertions(+), 9 deletions(-)

diff --git a/lib/ipv6.c b/lib/ipv6.c
index fa84b84..a8b114d 100644
--- a/lib/ipv6.c
+++ b/lib/ipv6.c
@@ -67,12 +67,11 @@ ipv6_classify(ip_addr *a)
 {
   u32 x = a->addr[0];
 
-  /* FIXME: Relax these requirements? */
   if ((x & 0xe0000000) == 0x20000000)		/* Aggregatable Global Unicast Address */
     return IADDR_HOST | SCOPE_UNIVERSE;
-  if ((x & 0xfc000000) == 0xe8000000)		/* Link-Local Address */
+  if ((x & 0xffc00000) == 0xfe800000)		/* Link-Local Address */
     return IADDR_HOST | SCOPE_LINK;
-  if ((x & 0xfc000000) == 0xec000000)		/* Site-Local Address */
+  if ((x & 0xffc00000) == 0xfec00000)		/* Site-Local Address */
     return IADDR_HOST | SCOPE_SITE;
   if ((x & 0xff000000) == 0xff000000)		/* Multicast Address */
     {
@@ -86,8 +85,21 @@ ipv6_classify(ip_addr *a)
 	case 14: return IADDR_MULTICAST | SCOPE_UNIVERSE;
 	}
     }
-  if (!x && !a->addr[1] && !a->addr[2] && a->addr[3] == 1)
-    return IADDR_HOST | SCOPE_HOST;		/* Loopback address */
+  if (!x && !a->addr[1] && !a->addr[2])
+    {
+      u32 y = a->addr[3];
+      if (y == 1)
+	return IADDR_HOST | SCOPE_HOST;		/* Loopback address */
+      /* IPv4 compatible addresses */
+      if (y >= 0x7f000000 && y < 0x80000000)
+	return IADDR_HOST | SCOPE_HOST;
+      if ((y & 0xff000000) == 0x0a000000 ||
+	  (y & 0xffff0000) == 0xc0a80000 ||
+	  (y & 0xfff00000) == 0xac100000)
+	return IADDR_HOST | SCOPE_SITE;
+      if (y >= 0x01000000 && y < 0xe0000000)
+	return IADDR_HOST | SCOPE_UNIVERSE;
+    }
   return IADDR_INVALID;
 }
 
diff --git a/nest/iface.c b/nest/iface.c
index b58b183..d41b39d 100644
--- a/nest/iface.c
+++ b/nest/iface.c
@@ -371,8 +371,10 @@ ifa_update(struct ifa *a)
 
   if (!(i->flags & IF_MULTIACCESS) && a->pxlen < BITS_PER_IP_ADDRESS - 2)
     log(L_WARN "Strange prefix length %d for point-to-point interface %s", a->pxlen, i->name);
+#ifndef IPV6
   if ((i->flags & IF_BROADCAST) && !ipa_nonzero(a->brd))
     log(L_ERR "Missing broadcast address for interface %s", i->name);
+#endif
 
   b = mb_alloc(if_pool, sizeof(struct ifa));
   memcpy(b, a, sizeof(struct ifa));
diff --git a/nest/rt-table.c b/nest/rt-table.c
index ae27ceb..0c4c9e7 100644
--- a/nest/rt-table.c
+++ b/nest/rt-table.c
@@ -232,10 +232,18 @@ rte_validate(rte *e)
       c = ipa_classify(n->n.prefix);
       if (c < 0 || !(c & IADDR_HOST))
 	{
-	  if (!ipa_nonzero(n->n.prefix) && n->n.pxlen <= 1)
-	    return 1;		/* Default route and half-default route is OK */
-	  log(L_WARN "Ignoring bogus route %I/%d received from %I via %s",
-	      n->n.prefix, n->n.pxlen, e->attrs->from, e->attrs->proto->name);
+	  if (!ipa_nonzero(n->n.prefix))
+	    {
+	      /* Various default routes */
+#ifdef IPV6
+	      if (n->n.pxlen == 96)
+#else
+	      if (n->n.pxlen <= 1)
+#endif
+		return 1;
+	    }
+	  log(L_WARN "Ignoring bogus route %I/%d received via %s",
+	      n->n.prefix, n->n.pxlen, e->attrs->proto->name);
 	  return 0;
 	}
       if ((c & IADDR_SCOPE_MASK) < e->attrs->proto->min_scope)
-- 
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