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ipv6/nib: _handle_rtr_timeout() do not blindly delete offlink entry

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Fabian Hüßler 2022-11-13 21:50:29 +01:00 committed by Fabian Hüßler
parent 1d3b320c2e
commit 96480008ca
1 changed files with 9 additions and 8 deletions
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17
sys/net/gnrc/network_layer/ipv6/nib/nib.c
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@ -1458,17 +1458,18 @@ static void _handle_rtr_timeout(_nib_dr_entry_t *router)
{
if ((router->next_hop != NULL) && (router->next_hop->mode & _DRL)) {
_nib_offl_entry_t *route = NULL;
unsigned iface = _nib_onl_get_if(router->next_hop);
ipv6_addr_t addr = router->next_hop->ipv6;
_nib_onl_entry_t *next_hop = router->next_hop;
_nib_drl_remove(router);
/* also remove all routes to that router */
/* The Router Lifetime applies only to
the router's usefulness as a default router; it
does not apply to information contained in other
message fields or options. Options that need time
limits for their information include their own
lifetime fields.
(https://datatracker.ietf.org/doc/html/rfc4861#section-4.2) */
while ((route = _nib_offl_iter(route))) {
if ((route->next_hop != NULL) &&
(_nib_onl_get_if(route->next_hop) == iface) &&
(ipv6_addr_equal(&route->next_hop->ipv6, &addr))) {
route->mode = _EMPTY;
route->next_hop->mode &= ~_DST;
if (route->next_hop == next_hop) {
_nib_offl_clear(route);
/* XXX routing protocol gets informed in case NUD
* determines ipv6->src (still in neighbor cache) to be