From: Steven Barth <steven@midlink.org>
Date: Mon, 6 Apr 2015 10:47:28 +0000 (+0200)
Subject: dhcpv6: fix handling of infinite lifetimes
X-Git-Url: https://git.archive.openwrt.org/?a=commitdiff_plain;h=9bdbc5a4be1ab75145431bc728159a55c723e2ca;p=project%2Fodhcpd.git

dhcpv6: fix handling of infinite lifetimes
---

diff --git a/src/dhcpv6-ia.c b/src/dhcpv6-ia.c
index 74e3441..de44581 100644
--- a/src/dhcpv6-ia.c
+++ b/src/dhcpv6-ia.c
@@ -728,13 +728,19 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
 					m = i;
 
 			for (size_t i = 0; i < addrlen; ++i) {
-				uint32_t prefix_pref = addrs[i].preferred - now;
-				uint32_t prefix_valid = addrs[i].valid - now;
+				uint32_t prefix_pref = addrs[i].preferred;
+				uint32_t prefix_valid = addrs[i].valid;
 
 				if (addrs[i].prefix > 96 ||
 						addrs[i].preferred <= (uint32_t)now)
 					continue;
 
+				if (prefix_pref != UINT32_MAX)
+					prefix_pref -= now;
+
+				if (prefix_valid != UINT32_MAX)
+					prefix_valid -= now;
+
 				if (a->length < 128) {
 					struct dhcpv6_ia_prefix p = {
 						.type = htons(DHCPV6_OPT_IA_PREFIX),