sys/netinet6/nd6_rtr.c

449 	 * router's neighbor cache, which might also affect our on-link
493  * default router list processing sub routines
564  * Remove the default route for a given router.
595  * Remove all default routes from default router list.
607 	 * current default router list and use that when deleting routes.
638  * Look up a matching default router list entry and remove it. Returns true if a
661  * Remove a router from the global list and optionally stash it in a
687 	 * Flush all the routing table entries that use the router
699 	 * Also delete all the pointers to the router in each prefix lists.
711 	 * If the router is the primary one, choose a new one.
726  * draft-ietf-ipngwg-router-selection:
728  *    If we have more than one (probably) reachable router, prefer ones
729  *    with the highest router preference.
732  *    fashion, regardless of router preference values.
736  * We assume nd_defrouter is sorted by router preference value.
737  * Since the code below covers both with and without router preference cases,
740  * At this moment, we do not try to install more than one default router,
764 	 * If default router list is empty, there's nothing to be done.
772 	 * Search for a (probably) reachable router from the list.
801 				             "one router is installed\n");
808 	 * Otherwise, if we have an installed router, check if the selected
809 	 * (reachable) router should really be preferred to the installed one.
810 	 * We only prefer the new router when the old one is not reachable
820 		/* Ensure we select a router for this FIB. */
845 	 * If we selected a router for this FIB and it's different
846 	 * than the installed one, remove the installed router and
862  * Maintain old KPI for default router selection.
872  * for default router selection
873  * regards router-preference field as a 2-bit signed integer
926 		 * router is still installed in the kernel.
938 	 * The router needs to be reinserted into the default router
956 		 * The preferred router may have changed, so relocate this
957 		 * router.
973 	 * Insert the new router in the Default Router List;
975 	 * of router-preferece.  Routers with the same preference are
1004 		if (search->router == dr)
1029 	new->router = dr;
1054 	defrouter_rele(pfr->router);
1553  * detect if a given prefix has a (probably) reachable advertising router.
1566 		IF_AFDATA_RLOCK(pfxrtr->router->ifp);
1567 		ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1568 		IF_AFDATA_RUNLOCK(pfxrtr->router->ifp);
1580  * Check if each prefix in the prefix list has at least one available router
1581  * that advertised the prefix (a router is "available" if its neighbor cache
1586  * that has an available router.
1587  * But, if there is no prefix that has an available router, we still regard
1590  * is no router around us.
1608 	 * router.
1616 	 * If we have no such prefix, check whether we still have a router
1633 		 * There is at least one prefix that has a reachable router,
1634 		 * or at least a router which probably does not advertise
1636 		 * to a new link where we have a router that does not provide
1639 		 * router, and attach other prefixes.
1656 		/* there is no prefix that has a reachable router */
2334  * it shouldn't be called when acting as a router.