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,
+	  opp, ip_scope_text(a->scope));
-	  ip_scope_text(a->scope),
-	  (a->flags & IA_UNNUMBERED) ? ", unnumbered" : "");
 }
 
 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;

proto/ospf/iface.c

@@ -443,6 +443,10 @@ ospf_iface_stubby(struct ospf_iface_patt *ip, struct ifa *addr)
   if (! addr)
     return 0;
 
+  /* a host/loopback address */
+  if (addr->flags & IA_HOST)
+    return 1;
+
   /*
    * We cannot properly support multiple OSPF ifaces on real iface
    * with multiple prefixes, therefore we force OSPF ifaces with
@@ -453,10 +457,6 @@ ospf_iface_stubby(struct ospf_iface_patt *ip, struct ifa *addr)
     return 1;
 #endif
 
-  /* a loopback/dummy address */
-  if ((addr->pxlen == MAX_PREFIX_LENGTH) && ipa_zero(addr->opposite))
-    return 1;
-
   return ip->stub;
 }
 
@@ -522,10 +522,10 @@ ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *i
   int old_type = ifa->type;
 
 #ifdef OSPFv2
-  if ((ifa->type == OSPF_IT_BCAST) && (addr->flags & IA_UNNUMBERED))
+  if ((ifa->type == OSPF_IT_BCAST) && (addr->flags & IA_PEER))
     ifa->type = OSPF_IT_PTP;
 
-  if ((ifa->type == OSPF_IT_NBMA) && (addr->flags & IA_UNNUMBERED))
+  if ((ifa->type == OSPF_IT_NBMA) && (addr->flags & IA_PEER))
     ifa->type = OSPF_IT_PTMP;
 #endif
 
@@ -1115,7 +1115,7 @@ ospf_iface_info(struct ospf_iface *ifa)
   else
   {
 #ifdef OSPFv2
-    if (ifa->addr->flags & IA_UNNUMBERED)
+    if (ifa->addr->flags & IA_PEER)
       cli_msg(-1015, "Interface %s (peer %I)", ifa->iface->name, ifa->addr->opposite);
     else
       cli_msg(-1015, "Interface %s (%I/%d)", ifa->iface->name, ifa->addr->prefix, ifa->addr->pxlen);

proto/ospf/packet.c

@@ -269,7 +269,7 @@ ospf_rx_hook(sock *sk, int size)
   struct proto_ospf *po = ifa->oa->po;
   // struct proto *p = &po->proto;
 
-  int src_local = ifa_match_addr(ifa->addr, sk->faddr);
+  int src_local = ipa_in_net(sk->faddr, ifa->addr->prefix, ifa->addr->pxlen);
   int dst_local = ipa_equal(sk->laddr, ifa->addr->ip);
   int dst_mcast = ipa_equal(sk->laddr, AllSPFRouters) || ipa_equal(sk->laddr, AllDRouters);
 

proto/ospf/topology.c

@@ -160,6 +160,7 @@ configured_stubnet(struct ospf_area *oa, struct ifa *a)
   if (!oa->ac)
     return 0;
 
+  /* Does not work for IA_PEER addresses, but it is not called on these */
   struct ospf_stubnet_config *sn;
   WALK_LIST(sn, oa->ac->stubnet_list)
     {
@@ -254,7 +255,7 @@ originate_rt_lsa_body(struct ospf_area *oa, u16 *length)
 	    ln = lsab_alloc(po, sizeof(struct ospf_lsa_rt_link));
 	    ln->type = LSART_PTP;
 	    ln->id = neigh->rid;
-	    ln->data = (ifa->addr->flags & IA_UNNUMBERED) ?
+	    ln->data = (ifa->addr->flags & IA_PEER) ?
 	      ifa->iface->index : ipa_to_u32(ifa->addr->ip);
 	    ln->metric = ifa->cost;
 	    ln->padding = 0;
@@ -301,12 +302,14 @@ originate_rt_lsa_body(struct ospf_area *oa, u16 *length)
     /* Now we will originate stub area if there is no primary */
     if (net_lsa ||
 	(ifa->type == OSPF_IT_VLINK) ||
-	(ifa->addr->flags & IA_UNNUMBERED) ||
+	(ifa->addr->flags & IA_PEER) ||
 	configured_stubnet(oa, ifa->addr))
       continue;
 
     ln = lsab_alloc(po, sizeof(struct ospf_lsa_rt_link));
-    if ((ifa->state == OSPF_IS_LOOP) || (ifa->type == OSPF_IT_PTMP))
+    if ((ifa->addr->flags & IA_HOST) ||
+	(ifa->state == OSPF_IS_LOOP) ||
+	(ifa->type == OSPF_IT_PTMP))
     {
       /* Host stub entry */
       ln->type = LSART_STUB;
@@ -1208,7 +1211,7 @@ originate_prefix_rt_lsa_body(struct ospf_area *oa, u16 *length)
     WALK_LIST(a, ifa->iface->addrs)
       {
 	if ((a->flags & IA_SECONDARY) ||
-	    (a->flags & IA_UNNUMBERED) ||
+	    (a->flags & IA_PEER) ||
 	    (a->scope <= SCOPE_LINK))
 	  continue;
 
@@ -1219,15 +1222,16 @@ originate_prefix_rt_lsa_body(struct ospf_area *oa, u16 *length)
 	    configured_stubnet(oa, a))
 	  continue;
 
-	if ((ifa->state == OSPF_IS_LOOP) || (ifa->type == OSPF_IT_PTMP))
+	if ((a->flags & IA_HOST) ||
+	    (ifa->state == OSPF_IS_LOOP) ||
+	    (ifa->type == OSPF_IT_PTMP))
+	{
 	  lsa_put_prefix(po, a->ip, MAX_PREFIX_LENGTH, 0);
+	  host_addr = 1;
+	}
 	else
 	  lsa_put_prefix(po, a->prefix, a->pxlen, ifa->cost);
 	i++;
-
-	if ((ifa->state == OSPF_IS_LOOP) ||
-	    (a->pxlen == MAX_PREFIX_LENGTH))
-	  host_addr = 1;
       }
 
     ifa->px_pos_end = i;

proto/rip/rip.c

@@ -704,7 +704,7 @@ new_iface(struct proto *p, struct iface *new, unsigned long flags, struct iface_
     }
 
   if (new) {
-    if (new->addr->flags & IA_UNNUMBERED)
+    if (new->addr->flags & IA_PEER)
       log( L_WARN "%s: rip is not defined over unnumbered links", p->name );
     if (rif->multicast) {
 #ifndef IPV6

sysdep/bsd/krt-sock.c

@@ -543,6 +543,9 @@ krt_read_addr(struct ks_msg *msg)
   {
     ifa.prefix = ipa_and(ifa.ip, ipa_mkmask(masklen));
 
+    if (masklen == BITS_PER_IP_ADDRESS)
+      ifa.flags |= IA_HOST;
+
     if (masklen == (BITS_PER_IP_ADDRESS - 1))
       ifa.opposite = ipa_opposite_m1(ifa.ip);
 
@@ -553,7 +556,7 @@ krt_read_addr(struct ks_msg *msg)
   }
   else         /* PtP iface */
   {
-    ifa.flags |= IA_UNNUMBERED;
+    ifa.flags |= IA_PEER;
     ifa.prefix = ifa.opposite = ifa.brd;
   }
 

sysdep/linux/netlink/netlink.c

@@ -499,10 +499,12 @@ nl_parse_addr(struct nlmsghdr *h)
       ipa_ntoh(addr);
       ifa.prefix = ifa.brd = addr;
 
-      /* It is either a peer address, or loopback/dummy address */
+      /* It is either a host address or a peer address */
-      if (!ipa_equal(ifa.ip, addr))
+      if (ipa_equal(ifa.ip, addr))
+	ifa.flags |= IA_HOST;
+      else
 	{
-	  ifa.flags |= IA_UNNUMBERED;
+	  ifa.flags |= IA_PEER;
 	  ifa.opposite = addr;
 	}
     }

sysdep/unix/krt-iface.c

@@ -98,7 +98,7 @@ scan_ifs(struct ifreq *r, int cnt)
 
       if (fl & IFF_POINTOPOINT)
 	{
-	  a.flags |= IA_UNNUMBERED;
+	  a.flags |= IA_PEER;
 	  if (ioctl(if_scan_sock, SIOCGIFDSTADDR, r) < 0)
 	    { err = "SIOCGIFDSTADDR"; goto faulty; }
 	  get_sockaddr((struct sockaddr_in *) &r->ifr_addr, &a.opposite, NULL, 1);
@@ -114,7 +114,7 @@ scan_ifs(struct ifreq *r, int cnt)
 	  && (fl & IFF_MULTICAST)
 #endif
 #ifndef CONFIG_UNNUM_MULTICAST
-	  && !(a.flags & IA_UNNUMBERED)
+	  && !(a.flags & IA_PEER)
 #endif
 	 )
 	i.flags |= IF_MULTICAST;