X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fodhcpd.git;a=blobdiff_plain;f=src%2Fdhcpv6-ia.c;h=de445816116693d0aa70343a2a9fc75fcfcfa7e8;hp=ffcb6dfa63ba485ae39b6c0609474adda91e2f00;hb=9bdbc5a4be1ab75145431bc728159a55c723e2ca;hpb=ef74d8ae3d22dc3acba6d583c0de2983ada57f13

diff --git a/src/dhcpv6-ia.c b/src/dhcpv6-ia.c
index ffcb6df..de44581 100644
--- a/src/dhcpv6-ia.c
+++ b/src/dhcpv6-ia.c
@@ -219,7 +219,7 @@ void dhcpv6_write_statefile(void)
 			return;
 
 		lockf(fd, F_LOCK, 0);
-		ftruncate(fd, 0);
+		if (ftruncate(fd, 0) < 0) {}
 
 		FILE *fp = fdopen(fd, "w");
 		if (!fp) {
@@ -254,15 +254,18 @@ void dhcpv6_write_statefile(void)
 					struct in6_addr addr;
 					struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->ia_addr;
 					size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->ia_addr_len;
-					size_t mostpref = 0;
+					size_t m = 0;
 
 					for (size_t i = 0; i < addrlen; ++i)
-						if (addrs[i].preferred > addrs[mostpref].preferred)
-							mostpref = i;
+						if (addrs[i].preferred > addrs[m].preferred ||
+								(addrs[i].preferred == addrs[m].preferred &&
+										memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
+							m = i;
 
 					for (size_t i = 0; i < addrlen; ++i) {
 						if (addrs[i].prefix > 96 || c->valid_until <= now ||
-								(iface->managed < RELAYD_MANAGED_NO_AFLAG && i != mostpref))
+								(iface->managed < RELAYD_MANAGED_NO_AFLAG && i != m &&
+										addrs[i].prefix == 64))
 							continue;
 
 						addr = addrs[i].addr;
@@ -716,20 +719,28 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
 
 			struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
 			size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
-			size_t mostpref = 0;
+			size_t m = 0;
 
 			for (size_t i = 0; i < addrlen; ++i)
-				if (addrs[i].preferred > addrs[mostpref].preferred)
-					mostpref = i;
+				if (addrs[i].preferred > addrs[m].preferred ||
+						(addrs[i].preferred == addrs[m].preferred &&
+								memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
+					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),
@@ -760,7 +771,8 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
 					n.addr.s6_addr32[3] = htonl(a->assigned);
 					size_t entrlen = sizeof(n) - 4;
 
-					if (iface->managed < RELAYD_MANAGED_NO_AFLAG && i != mostpref)
+					if (iface->managed < RELAYD_MANAGED_NO_AFLAG && i != m &&
+							addrs[i].prefix == 64)
 						continue;
 
 					if (datalen + entrlen + 4 > buflen || a->assigned == 0)