/**
* process the kernel change list.
* the routes are already ordered such that nexthop routes
* are on the head of the queue.
* non-nexthop routes need to be changed first and therefore
* the queue needs to be traversed from tail to head.
*/
static void
olsr_chg_kernel_routes(struct list_node *head_node)
{
struct rt_entry *rt;
if (list_is_empty(head_node)) {
return;
}
/*
* Traverse from the beginning to the end of the list,
* such that nexthop routes are added first.
*/
while (!list_is_empty(head_node)) {
rt = changelist2rt(head_node->next);
/*deleting routes should not be required anymore as we use (NLM_F_CREATE | NLM_F_REPLACE) in linux rtnetlink*/
#ifdef LINUX_NETLINK_ROUTING
/*delete routes with ipv6 only as it still doesn`t support NLM_F_REPLACE*/
if (((olsr_cnf->ip_version != AF_INET )
|| (olsr_addroute_function != olsr_ioctl_add_route) || (olsr_addroute6_function != olsr_ioctl_add_route6)
|| (olsr_delroute_function != olsr_ioctl_del_route) || (olsr_delroute6_function != olsr_ioctl_del_route6))
&& (rt->rt_nexthop.iif_index > -1)) {
olsr_delete_kernel_route(rt);
}
#else
/*no rtnetlink we have to delete routes*/
if (rt->rt_nexthop.iif_index > -1) olsr_delete_kernel_route(rt);
#endif /*LINUX_NETLINK_ROUTING*/
olsr_add_kernel_route(rt);
list_remove(&rt->rt_change_node);
}
}
/**
* process the kernel change list.
* the routes are already ordered such that nexthop routes
* are on the head of the queue.
* non-nexthop routes need to be changed first and therefore
* the queue needs to be traversed from tail to head.
*/
static void
olsr_chg_kernel_routes(struct list_node *head_node)
{
struct rt_entry *rt;
if (list_is_empty(head_node)) {
return;
}
/*
* Traverse from the beginning to the end of the list,
* such that nexthop routes are added first.
*/
while (!list_is_empty(head_node)) {
rt = changelist2rt(head_node->next);
#ifdef linux
/*
* actively deleting routes is not necessary as we use (NLM_F_CREATE | NLM_F_REPLACE) with linux
* (i.e. new routes simply overwrite the old ones in kernel)
* BUT: We still have to actively delete routes if fib_metric != FLAT or we run on ipv6.
* As NLM_F_REPLACE is not supported with IPv6, or simply of no use with varying route metrics.
* We also actively delete routes if custom route functions are in place. (e.g. quagga plugin)
*/
if (((olsr_cnf->ip_version != AF_INET ) || (olsr_cnf->fib_metric != FIBM_FLAT)
|| (olsr_addroute_function != olsr_ioctl_add_route) || (olsr_addroute6_function != olsr_ioctl_add_route6)
|| (olsr_delroute_function != olsr_ioctl_del_route) || (olsr_delroute6_function != olsr_ioctl_del_route6))
&& (rt->rt_nexthop.iif_index > -1)) {
olsr_delete_kernel_route(rt);
}
#else
/*no rtnetlink we have to delete routes*/
if (rt->rt_nexthop.iif_index > -1) olsr_delete_kernel_route(rt);
#endif /* linux */
olsr_add_kernel_route(rt);
list_remove(&rt->rt_change_node);
}
}
/**
* Walk all the routes, remove outdated routes and run
* best path selection on the remaining set.
* Finally compare the nexthop of the route head and the best
* path and enqueue an add/chg operation.
*/
void
olsr_update_rib_routes(void)
{
struct rt_entry *rt;
OLSR_PRINTF(3, "Updating kernel routes...\n");
/* walk all routes in the RIB. */
OLSR_FOR_ALL_RT_ENTRIES(rt) {
/* eliminate first unused routes */
olsr_delete_outdated_routes(rt);
if (!rt->rt_path_tree.count) {
/* oops, all routes are gone - flush the route head */
if (olsr_delete_kernel_route(rt) == 0) {
/*only remove if deletion was successful*/
avl_delete(&routingtree, &rt->rt_tree_node);
olsr_cookie_free(rt_mem_cookie, rt);
}
continue;
}
/* run best route election */
olsr_rt_best(rt);
/* nexthop or hopcount change ? */
if (olsr_nh_change(&rt->rt_best->rtp_nexthop, &rt->rt_nexthop)
|| (FIBM_CORRECT == olsr_cnf->fib_metric && olsr_hopcount_change(&rt->rt_best->rtp_metric, &rt->rt_metric))) {
/* this is a route add or change. */
olsr_enqueue_rt(&chg_kernel_list, rt);
}
}
OLSR_FOR_ALL_RT_ENTRIES_END(rt);
}
