Skip prefixes with vltime 0.

Servers indicate unusable prefixes with vltime 0 when we are in
state reboot and probably hand us new, valid prefixes.
In IPv4 dhcp we would receive a NACK instead...

diff --git a/sbin/dhcp6leased/engine.c b/sbin/dhcp6leased/engine.c
index 9e457f8..e708f8e 100644 (file)
--- a/sbin/dhcp6leased/engine.c
+++ b/sbin/dhcp6leased/engine.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: engine.c,v 1.15 2024/07/09 13:27:18 florian Exp $     */
+/*     $OpenBSD: engine.c,v 1.16 2024/07/09 16:15:42 florian Exp $     */
 
 /*
  * Copyright (c) 2017, 2021, 2024 Florian Obser <florian@openbsd.org>
@@ -977,18 +977,25 @@ parse_ia_pd_options(uint8_t *p, size_t len, struct prefix *prefix)
                            ntohl(iaprefix.vltime), inet_ntop(AF_INET6,
                            &iaprefix.prefix, ntopbuf, INET6_ADDRSTRLEN),
                            iaprefix.prefix_len);
+
                        if (ntohl(iaprefix.vltime) < ntohl(iaprefix.pltime)) {
                                log_warnx("%s: vltime < pltime, ignoring IA_PD",
                                    __func__);
                                break;
                        }
 
+                       if (ntohl(iaprefix.vltime) == 0) {
+                               log_debug("%s: vltime == 0, ignoring IA_PD",
+                                   __func__);
+                               break;
+                       }
+
                        prefix->prefix = iaprefix.prefix;
                        prefix->prefix_len = iaprefix.prefix_len;
                        prefix->vltime = ntohl(iaprefix.vltime);
                        prefix->pltime = ntohl(iaprefix.pltime);
 
-                       /* make sure prefix is mask correctly */
+                       /* make sure prefix is masked correctly */
                        memset(&mask, 0, sizeof(mask));
                        in6_prefixlen2mask(&mask, prefix->prefix_len);
                        for (i = 0; i < 16; i++)