136  * Remove a router from the global list and optionally stash it in a
152  * Receive Router Solicitation Message - just for routers.
153  * Router solicitation/advertisement is mostly managed by userland program
340 	 * XXX-BZ we might want to trigger re-evaluation of our default router  in nd6_ifnet_link_event()
341 	 * availability. E.g., on link down the default router might be  in nd6_ifnet_link_event()
352  * Receive Router Advertisement Message.
596 	 * router's neighbor cache, which might also affect our on-link  in nd6_ra_input()
620 		if (search->router == dr)  in pfxrtr_lookup()
645 	new->router = dr;  in pfxrtr_add()
670 	defrouter_rele(pfr->router);  in pfxrtr_del()
674 /* Default router list processing sub routines. */
701  * Remove the default route for a given router.
746 	 * Flush all the routing table entries that use the router  in defrouter_del()
762 	 * Also delete all the pointers to the router in each prefix lists.  in defrouter_del()
774 	 * If the router is the primary one, choose a new one.  in defrouter_del()
813  * Remove all default routes from default router list.
825 	 * current default router list and use that when deleting routes.  in defrouter_reset()
856  * Look up a matching default router list entry and remove it. Returns true if a
879  * for default router selection
880  * regards router-preference field as a 2-bit signed integer
918  * Default Router Selection according to Section 6.3.6 of RFC 2461 and
919  * draft-ietf-ipngwg-router-selection:
921  *    If we have more than one (probably) reachable router, prefer ones
922  *    with the highest router preference.
925  *    fashion, regardless of router preference values.
926  * 3) If the Default Router List is empty, assume that all
929  * We assume nd_defrouter is sorted by router preference value.
930  * Since the code below covers both with and without router preference cases,
933  * At this moment, we do not try to install more than one default router,
958 	 * If default router list is empty, there's nothing to be done.  in defrouter_select_fib()
966 	 * Search for a (probably) reachable router from the list.  in defrouter_select_fib()
991 				             "one router is installed\n");  in defrouter_select_fib()
999 	 * Otherwise, if we have an installed router, check if the selected  in defrouter_select_fib()
1000 	 * (reachable) router should really be preferred to the installed one.  in defrouter_select_fib()
1001 	 * We only prefer the new router when the old one is not reachable  in defrouter_select_fib()
1011 		/* Ensure we select a router for this FIB. */  in defrouter_select_fib()
1029 	 * If we selected a router for this FIB and it's different  in defrouter_select_fib()
1030 	 * than the installed one, remove the installed router and  in defrouter_select_fib()
1074 		 * router is still installed in the kernel.  in defrtrlist_update()
1086 	 * The router needs to be reinserted into the default router  in defrtrlist_update()
1104 		 * The preferred router may have changed, so relocate this  in defrtrlist_update()
1105 		 * router.  in defrtrlist_update()
1121 	 * Insert the new router in the Default Router List;  in defrtrlist_update()
1122 	 * The Default Router List should be in the descending order  in defrtrlist_update()
1123 	 * of router-preferece.  Routers with the same preference are  in defrtrlist_update()
1790  * detect if a given prefix has a (probably) reachable advertising router.
1803 		if (is_dr_reachable(pfxrtr->router))  in find_pfxlist_reachable_router()
1811  * Check if each prefix in the prefix list has at least one available router
1812  * that advertised the prefix (a router is "available" if its neighbor cache
1817  * that has an available router.
1818  * But, if there is no prefix that has an available router, we still regard
1821  * is no router around us.
1839 	 * router.  in pfxlist_onlink_check()
1847 	 * If we have no such prefix, check whether we still have a router  in pfxlist_onlink_check()
1864 		 * There is at least one prefix that has a reachable router,  in pfxlist_onlink_check()
1865 		 * or at least a router which probably does not advertise  in pfxlist_onlink_check()
1867 		 * to a new link where we have a router that does not provide  in pfxlist_onlink_check()
1870 		 * router, and attach other prefixes.  in pfxlist_onlink_check()
1887 		/* there is no prefix that has a reachable router */  in pfxlist_onlink_check()
2258 	/* Subnet-router anycast: 0000:0000:0000:0000 */  in in6_get_tmp_ifid()
2434  * it shouldn't be called when acting as a router.
2507  * Nuke default router list entries toward ifp.
2508  * We defer removal of default router list entries that is installed in the
2534 	/* Delete the unlinked router objects. */  in nd6_defrouter_purge()
2605 	"NDP default router list");