Minor changes in addresses.

Mainly changes IA_UNNUMBERED to IA_PEER and adds IA_HOST. Also do not
show broadcast addr in show interfaces. Nobody cares for that.

nest/iface.c

@@ -51,7 +51,7 @@ ifa_dump(struct ifa *a)
   debug("\t%I, net %I/%-2d bc %I -> %I%s%s%s\n", a->ip, a->prefix, a->pxlen, a->brd, a->opposite,
 	(a->flags & IF_UP) ? "" : " DOWN",
 	(a->flags & IA_PRIMARY) ? "" : " SEC",
-	(a->flags & IA_UNNUMBERED) ? " UNNUM" : "");
+	(a->flags & IA_PEER) ? "PEER" : "");
 }
 
 /**
@@ -474,7 +474,7 @@ ifa_update(struct ifa *a)
 	    ipa_equal(b->brd, a->brd) &&
 	    ipa_equal(b->opposite, a->opposite) &&
 	    b->scope == a->scope &&
-	    !((b->flags ^ a->flags) & IA_UNNUMBERED))
+	    !((b->flags ^ a->flags) & IA_PEER))
 	  {
 	    b->flags |= IF_UPDATED;
 	    return b;
@@ -543,7 +543,7 @@ auto_router_id(void)
     if ((i->flags & IF_ADMIN_UP) &&
 	!(i->flags & (IF_IGNORE | IF_SHUTDOWN)) &&
 	i->addr &&
-	!(i->addr->flags & IA_UNNUMBERED) &&
+	!(i->addr->flags & IA_PEER) &&
 	(!j || ipa_to_u32(i->addr->ip) < ipa_to_u32(j->addr->ip)))
       j = i;
   if (!j)
@@ -602,7 +602,7 @@ iface_patt_match(struct iface_patt *ifp, struct iface *i, struct ifa *a)
       if (ipa_in_net(a->ip, p->prefix, p->pxlen))
 	return pos;
 
-      if ((a->flags & IA_UNNUMBERED) &&
+      if ((a->flags & IA_PEER) &&
 	  ipa_in_net(a->opposite, p->prefix, p->pxlen))
 	return pos;
 	  
@@ -671,23 +671,16 @@ iface_patts_equal(list *a, list *b, int (*comp)(struct iface_patt *, struct ifac
 static void
 if_show_addr(struct ifa *a)
 {
-  byte broad[STD_ADDRESS_P_LENGTH + 16];
   byte opp[STD_ADDRESS_P_LENGTH + 16];
 
-  if (ipa_nonzero(a->brd))
-    bsprintf(broad, ", broadcast %I", a->brd);
-  else
-    broad[0] = 0;
   if (ipa_nonzero(a->opposite))
     bsprintf(opp, ", opposite %I", a->opposite);
   else
     opp[0] = 0;
-  cli_msg(-1003, "\t%I/%d (%s%s%s, scope %s%s)",
+  cli_msg(-1003, "\t%I/%d (%s%s, scope %s)",
 	  a->ip, a->pxlen,
 	  (a->flags & IA_PRIMARY) ? "Primary" : (a->flags & IA_SECONDARY) ? "Secondary" : "Unselected",
-	  broad, opp,
-	  ip_scope_text(a->scope),
-	  (a->flags & IA_UNNUMBERED) ? ", unnumbered" : "");
+	  opp, ip_scope_text(a->scope));
 }
 
 void

nest/iface.h

@@ -51,9 +51,23 @@ struct iface {
 
 #define IA_PRIMARY 0x10000		/* This address is primary */
 #define IA_SECONDARY 0x20000		/* This address has been reported as secondary by the kernel */
-#define IA_UNNUMBERED 0x40000		/* This address belongs to an unnumbered device */
+#define IA_PEER 0x40000			/* A peer/ptp address */
+#define IA_HOST 0x80000			/* A host/loopback address */
 #define IA_FLAGS 0xff0000
 
+/*
+ * There are three kinds of addresses in BIRD:
+ *  - Standard (prefix-based) addresses, these may define ifa.opposite (for /30 or /31).
+ *  - Peer/ptp addresses, without common prefix for ifa.ip and ifa.opposite.
+ *    ifa.opposite is defined and ifa.prefix/pxlen == ifa.opposite/32 (for simplicity).
+ *  - Host addresses, with ifa.prefix/pxlen == ifa.ip/32 (or /128).
+ *    May be considered a special case of standard addresses.
+ *
+ * Peer addresses (AFAIK) do not exist in IPv6. Linux alos supports generalized peer
+ * address (with pxlen < 32 and ifa.ip outside prefix), we do not support that.
+ */
+
+
 #define IF_JUST_CREATED 0x10000000	/* Send creation event as soon as possible */
 #define IF_TMP_DOWN 0x20000000		/* Temporary shutdown due to interface reconfiguration */
 #define IF_UPDATED 0x40000000		/* Touched in last scan */
@@ -85,15 +99,6 @@ struct iface *if_find_by_index(unsigned);
 struct iface *if_find_by_name(char *);
 void ifa_recalc_all_primary_addresses(void);
 
-static inline int
-ifa_match_addr(struct ifa *ifa, ip_addr addr)
-{
-  if (ifa->flags & IA_UNNUMBERED)
-    return ipa_equal(addr, ifa->opposite);
-  else
-    return ipa_in_net(addr, ifa->prefix, ifa->pxlen);
-}
-
 /* The Neighbor Cache */
 
 typedef struct neighbor {

nest/neighbor.c

@@ -66,7 +66,7 @@ if_connected(ip_addr *a, struct iface *i) /* -1=error, 1=match, 0=no match */
     {
       if (ipa_equal(*a, b->ip))
 	return SCOPE_HOST;
-      if (b->flags & IA_UNNUMBERED)
+      if (b->flags & IA_PEER)
 	{
 	  if (ipa_equal(*a, b->opposite))
 	    return b->scope;