Implements interface masks for choosing router id.

Router ID could be automatically determined based of subset of
ifaces/addresses specified by 'router id from' option. The patch also
does some minor changes related to router ID reconfiguration.

Thanks to Alexander V. Chernikov for most of the work.

2 files changed, 14 insertions, 3 deletions

diff --git a/conf/conf.c b/conf/conf.c
index 6dfa3691..14225d3b 100644
--- a/conf/conf.c
+++ b/conf/conf.c
@@ -200,9 +200,19 @@ global_commit(struct config *new, struct config *old)
     log(L_WARN "Reconfiguration of BGP listening socket not implemented, please restart BIRD.");
 
   if (!new->router_id)
-    new->router_id = old->router_id;
-  if (new->router_id != old->router_id)
-    return 1;
+    {
+      new->router_id = old->router_id;
+
+      if (new->router_id_from)
+	{
+	  u32 id = if_choose_router_id(new->router_id_from, old->router_id);
+	  if (!id)
+	    log(L_WARN "Cannot determine router ID, using old one");
+	  else
+	    new->router_id = id;
+	}
+    }
+
   return 0;
 }
 
diff --git a/conf/conf.h b/conf/conf.h
index 19300f54..683374e0 100644
--- a/conf/conf.h
+++ b/conf/conf.h
@@ -26,6 +26,7 @@ struct config {
   int mrtdump_file;			/* Configured MRTDump file (sysdep, fd in unix) */
   char *syslog_name;			/* Name used for syslog (NULL -> no syslog) */
   struct rtable_config *master_rtc;	/* Configuration of master routing table */
+  struct iface_patt *router_id_from;	/* Configured list of router ID iface patterns */
 
   u32 router_id;			/* Our Router ID */
   ip_addr listen_bgp_addr;		/* Listening BGP socket should use this address */