treewide: define and use macro IN6_IS_ADDR_ULA

[project/odhcpd.git] / src / router.c

diff --git a/src/router.c b/src/router.c
index e11fa01..36267be 100644 (file)
--- a/src/router.c
+++ b/src/router.c
@@ -309,7 +309,7 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
                uint32_t this_lifetime = TIME_LEFT(addr->valid, now);
                if (this_lifetime > UINT16_MAX)
                        this_lifetime = UINT16_MAX;
-               if (((addr->addr.s6_addr[0] & 0xfe) != 0xfc || iface->default_router)
+               if ((!IN6_IS_ADDR_ULA(&addr->addr) || iface->default_router)
                                && adv.h.nd_ra_router_lifetime
                                && ntohs(adv.h.nd_ra_router_lifetime) < this_lifetime) {
                        adv.h.nd_ra_router_lifetime = htons(this_lifetime);