Fix calculation of preferred and valid times

3 files changed, 11 insertions, 7 deletions

diff --git a/src/dhcpv6.c b/src/dhcpv6.c
index 93433d4..28fad50 100644
--- a/src/dhcpv6.c
+++ b/src/dhcpv6.c
@@ -614,20 +614,24 @@ static int dhcpv6_handle_reply(_unused enum dhcpv6_msg orig,
 	dhcpv6_for_each_option(ia_pd, ia_pd + ia_pd_len, otype, olen, odata) {
 		struct dhcpv6_ia_prefix *p = (void*)&odata[-4];
 		uint32_t valid = ntohl(p->valid);
-		p->valid = (valid < elapsed) ? 0 : htonl(valid - elapsed);
+		if (valid != UINT32_MAX)
+			p->valid = (valid < elapsed) ? 0 : htonl(valid - elapsed);
 
 		uint32_t pref = ntohl(p->preferred);
-		p->preferred = (pref < elapsed) ? 0 : htonl(pref - elapsed);
+		if (pref != UINT32_MAX)
+			p->preferred = (pref < elapsed) ? 0 : htonl(pref - elapsed);
 	}
 
 	// Decrease valid and preferred lifetime of addresses
 	dhcpv6_for_each_option(ia_na, ia_na + ia_na_len, otype, olen, odata) {
 		struct dhcpv6_ia_addr *p = (void*)&odata[-4];
 		uint32_t valid = ntohl(p->valid);
-		p->valid = (valid < elapsed) ? 0 : htonl(valid - elapsed);
+		if (valid != UINT32_MAX)
+			p->valid = (valid < elapsed) ? 0 : htonl(valid - elapsed);
 
 		uint32_t pref = ntohl(p->preferred);
-		p->preferred = (pref < elapsed) ? 0 : htonl(pref - elapsed);
+		if (pref != UINT32_MAX)
+			p->preferred = (pref < elapsed) ? 0 : htonl(pref - elapsed);
 	}
 
 	// Parse and find all matching IAs
diff --git a/src/odhcp6c.h b/src/odhcp6c.h
index 04a32ec..1a5aabc 100644
--- a/src/odhcp6c.h
+++ b/src/odhcp6c.h
@@ -195,7 +195,7 @@ void dhcpv6_remove_addrs(void);
 
 int init_rtnetlink(void);
 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
-		time_t pref, time_t valid);
+		uint32_t pref, uint32_t valid);
 
 int script_init(const char *path, const char *ifname);
 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
diff --git a/src/rtnetlink.c b/src/rtnetlink.c
index d15ae13..6017aab 100644
--- a/src/rtnetlink.c
+++ b/src/rtnetlink.c
@@ -43,12 +43,12 @@ int init_rtnetlink(void)
 
 // CRUD addresses to interface
 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
-		time_t pref, time_t valid)
+		uint32_t pref, uint32_t valid)
 {
 	int flags = NLM_F_REQUEST | NLM_F_ACK;
 	int cmd = RTM_DELADDR;
 
-	if (valid > 0) {
+	if (valid) {
 		flags |= NLM_F_CREATE | NLM_F_REPLACE;
 		cmd = RTM_NEWADDR;
 	}