bsd/netinet6/nd6_rtr.c

284 	/* If I'm not a router, ignore it. */
398 	 * IFEF_IPV6_ROUTER is set (as router) but the RA is not locally
400 	 * RAs to be processed on the advertising interface, as a router.
403 	 * both a host and a router on different interfaces, hence the
589 			 * be properly set until after the router advertisement
698 	 * router's neighbor cache, which might also affect our on-link
726  * default router list proccessing sub routines
771 		nd6log2((LOG_INFO, "%s: ignoring router %s, scoped=%d, "
778 	nd6log2((LOG_INFO, "%s: adding default router %s, scoped=%d, "
807 		nd6log((LOG_ERR, "%s: failed to add default router "
839  * Remove the default route for a given router.
859 	nd6log2((LOG_INFO, "%s: removing default router %s, scoped=%d, "
889 		nd6log((LOG_ERR, "%s: failed to delete default router "
905  * remove all default routes from default router list
933 	/* Nuke primary (non-scoped) default router */
1033 	 * Flush all the routing table entries that use the router
1046 		deldr = dr;	/* The router is primary. */
1066 	 * Also delete all the pointers to the router in each prefix lists.
1080 	 * If the router is the primary one, choose a new one.  If Scoped
1081 	 * Routing is enabled, always try to pick another eligible router
1154  * for default router selection
1155  * regards router-preference field as a 2-bit signed integer
1184  *    If we have more than one (probably) reachable router, prefer ones
1185  *    with the highest router preference.
1188  *    fashion, regardless of router preference values.
1195  *    router will be set to the reachable router on that link (if any) with
1196  *    the highest router preference.
1198  *    the highest router preference will be installed, either as scoped or
1201  *    router, i.e. static one wins over dynamic.
1206  * We assume nd_defrouter is sorted by router preference value.
1207  * Since the code below covers both with and without router preference cases,
1240 	 * If default router list is empty, there's nothing to be done.
1258 	 * Search for a (probably) reachable router from the list.
1263 	 *	selected_dr	= candidate for primary router
1264 	 *	installed_dr	= currently installed primary router
1321 			 * If the router hasn't been installed and it is
1329 				nd6log2((LOG_INFO, "%s: possible router %s, "
1342 		/* Record the currently installed primary/non-scoped router */
1350 				    "%s default router is installed\n",
1384 		/* See if there is already a default router for the link */
1410 			nd6log2((LOG_INFO, "%s: possible router %s, "
1420 		nd6log2((LOG_INFO, "%s: considering primary default router %s, "
1431 	 * Otherwise, if we have an installed router, check if the selected
1432 	 * (reachable) router should really be preferred to the installed one.
1433 	 * We only prefer the new router when the old one is not reachable
1471 		 * If the installed primary router is not on the current
1485 		 * If the selected router is currently scoped, make sure
1493 		 * If the installed router is no longe reachable, remove
1494 		 * it and install the selected router instead.
1509 	 * the selected router is different than the installed one,
1510 	 * remove the installed router and install the selected one.
1519 			nd6log2((LOG_INFO, "%s: no update, selected router %s, "
1520 			    "installed router %s\n", if_name(dr->ifp),
1524 			nd6log2((LOG_INFO, "%s: no update, router is %s\n",
1549 	 * router needs to be installed as primary/non-scoped entry.  If
1554 		nd6log2((LOG_INFO, "%s: considering primary default router %s, "
1735 			 * put the primary/non-scoped router at the top of the
1770 			 * preferred router may be changed, so relocate
1771 			 * this router.
1841 	 * Insert the new router in the Default Router List;
1843 	 * of router-preferece.  When Scoped Routing is disabled, routers
1846 	 * preference is the primary default router, when the interface used
1928 		if (search->router == dr)
1947 	new->router = dr;
2880  * detect if a given prefix has a (probably) reachable advertising router.
2898 		if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
2899 		    pfxrtr->router->ifp, 0)) != NULL) {
2922  * Check if each prefix in the prefix list has at least one available router
2923  * that advertised the prefix (a router is "available" if its neighbor cache
2928  * that has an available router.
2929  * But, if there is no prefix that has an available router, we still regards
2932  * is no router around us.
2957 	 * router.
2991 	 * If we have no such prefix, check whether we still have a router
3014 		 * There is at least one prefix that has a reachable router,
3015 		 * or at least a router which probably does not advertise
3017 		 * to a new link where we have a router that does not provide
3020 		 * router, and attach other prefixes.
3058 		/* there is no prefix that has a reachable router */
4121  * it shouldn't be called when acting as a router.