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nd6: cull destination cache on router removal

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As per RFC requirements, upon removing a router from the default
router list, remove any entries pointing to it from the destination
cache. While here, synchronize timing out entries in the default
router list with the rest of the timer code.

When removing a netif, clear the destination cache altogether
in order to prevent more general inconsistency. When this happens,
the entries for other netifs will have to be rebuilt, but removing
netifs should be sufficiently rare that this is not worth optimizing.
This commit is contained in:
David van Moolenbroek 2017-01-02 15:35:27 +00:00 committed by Dirk Ziegelmeier
parent a1130f8c7b
commit 713146eeba
1 changed files with 16 additions and 5 deletions
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21
src/core/ipv6/nd6.c
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@ -957,15 +957,22 @@ nd6_tmr(void)
for (i = 0; i < LWIP_ND6_NUM_ROUTERS; i++) {
if (default_router_list[i].neighbor_entry != NULL) {
/* Active entry. */
if (default_router_list[i].invalidation_timer > 0) {
default_router_list[i].invalidation_timer -= ND6_TMR_INTERVAL / 1000;
}
if (default_router_list[i].invalidation_timer < ND6_TMR_INTERVAL / 1000) {
/* Less than 1 second remaining. Clear this entry. */
if (default_router_list[i].invalidation_timer <= ND6_TMR_INTERVAL / 1000) {
/* No more than 1 second remaining. Clear this entry. Also clear any of
* its destination cache entries, as per RFC 4861 Sec. 5.3 and 6.3.5. */
s8_t j;
for (j = 0; j < LWIP_ND6_NUM_DESTINATIONS; j++) {
if (ip6_addr_cmp(&destination_cache[j].next_hop_addr,
&default_router_list[i].neighbor_entry->next_hop_address)) {
ip6_addr_set_any(&destination_cache[j].destination_addr);
}
}
default_router_list[i].neighbor_entry->isrouter = 0;
default_router_list[i].neighbor_entry = NULL;
default_router_list[i].invalidation_timer = 0;
default_router_list[i].flags = 0;
} else {
default_router_list[i].invalidation_timer -= ND6_TMR_INTERVAL / 1000;
}
}
}
@ -2280,6 +2287,10 @@ nd6_cleanup_netif(struct netif *netif)
nd6_free_neighbor_cache_entry(i);
}
}
/* Clear the destination cache, since many entries may now have become
* invalid for one of several reasons. As destination cache entries have no
* netif association, use a sledgehammer approach (this can be improved). */
nd6_clear_destination_cache();
}
#if LWIP_IPV6_MLD