+ odhcpd_setup_route(addr, 128, iface, NULL, 1024, add);
+}
+
+// compare prefixes
+static int prefixcmp(const void *va, const void *vb)
+{
+ const struct odhcpd_ipaddr *a = va, *b = vb;
+ uint32_t a_pref = ((a->addr.s6_addr[0] & 0xfe) != 0xfc) ? a->preferred : 1;
+ uint32_t b_pref = ((b->addr.s6_addr[0] & 0xfe) != 0xfc) ? b->preferred : 1;
+ return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0;
+}
+
+// Check address update
+static void check_updates(struct interface *iface)
+{
+ struct odhcpd_ipaddr addr[8] = {{IN6ADDR_ANY_INIT, 0, 0, 0, 0}};
+ time_t now = odhcpd_time();
+ ssize_t len = odhcpd_get_interface_addresses(iface->ifindex, addr, 8);
+
+ if (len < 0)
+ return;
+
+ qsort(addr, len, sizeof(*addr), prefixcmp);
+
+ for (int i = 0; i < len; ++i) {
+ addr[i].addr.s6_addr32[3] = 0;
+
+ if (addr[i].preferred < UINT32_MAX - now)
+ addr[i].preferred += now;
+
+ if (addr[i].valid < UINT32_MAX - now)
+ addr[i].valid += now;
+ }
+
+ bool change = len != (ssize_t)iface->ia_addr_len;
+ for (ssize_t i = 0; !change && i < len; ++i)
+ if (!IN6_ARE_ADDR_EQUAL(&addr[i].addr, &iface->ia_addr[i].addr) ||
+ (addr[i].preferred > 0) != (iface->ia_addr[i].preferred > 0) ||
+ addr[i].valid < iface->ia_addr[i].valid ||
+ addr[i].preferred < iface->ia_addr[i].preferred)
+ change = true;
+
+ if (change)
+ dhcpv6_ia_preupdate(iface);
+
+ memcpy(iface->ia_addr, addr, len * sizeof(*addr));
+ iface->ia_addr_len = len;
+
+ if (change)
+ dhcpv6_ia_postupdate(iface, now);
+
+ if (change)
+ raise(SIGUSR1);