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nd6: check link status before sending packets

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In the cases that nd6 checks whether the interface is up before
sending a packet, also check whether the link is up.  Without this
additional check, temporary link downtime could easily result in
unnecessary false negatives for Duplicate Address Detection.

In addition, use the netif abstraction macros to perform the checks.
This commit is contained in:
David van Moolenbroek 2016-12-20 22:11:54 +00:00 committed by Dirk Ziegelmeier
parent e0c5e1988f
commit 2ff04a931a
1 changed files with 3 additions and 2 deletions
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5
src/core/ipv6/nd6.c
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@ -1004,7 +1004,7 @@ nd6_tmr(void)
}
#endif /* LWIP_IPV6_ADDRESS_LIFETIMES */
netif_ip6_addr_set_state(netif, i, addr_state);
} else if (netif->flags & NETIF_FLAG_UP) {
} else if (netif_is_up(netif) && netif_is_link_up(netif)) {
/* Send a NS for this address. */
nd6_send_ns(netif, netif_ip6_addr(netif, i), ND6_SEND_FLAG_MULTICAST_DEST);
/* tentative: set next state by increasing by one */
@ -1017,7 +1017,8 @@ nd6_tmr(void)
#if LWIP_IPV6_SEND_ROUTER_SOLICIT
/* Send router solicitation messages, if necessary. */
for (netif = netif_list; netif != NULL; netif = netif->next) {
if ((netif->rs_count > 0) && (netif->flags & NETIF_FLAG_UP) &&
if ((netif->rs_count > 0) && netif_is_up(netif) &&
netif_is_link_up(netif) &&
!ip6_addr_isinvalid(netif_ip6_addr_state(netif, 0)) &&
!ip6_addr_isduplicated(netif_ip6_addr_state(netif, 0))) {
if (nd6_send_rs(netif) == ERR_OK) {