ndp: keep an exact copy of IPv6 interface addresses

Don't reset the final 32 bit IPv6 host suffix when storing the IPv6 addresses
in the interface structure. This will allow exact lookup aand return of IPv6
addresses stored in the interface structure when needed.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

3 files changed, 9 insertions, 5 deletions

diff --git a/src/dhcpv6-ia.c b/src/dhcpv6-ia.c
index fb50448..09022a4 100644
--- a/src/dhcpv6-ia.c
+++ b/src/dhcpv6-ia.c
@@ -297,12 +297,12 @@ void dhcpv6_write_statefile(void)
 								continue;
 
 							addr.s6_addr32[3] = htonl(c->assigned);
-						}
-						else {
+						} else {
 							if (!valid_prefix_length(c, addrs[i].prefix))
 								continue;
 
 							addr.s6_addr32[1] |= htonl(c->assigned);
+							addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
 						}
 
 						inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1);
@@ -399,6 +399,7 @@ static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bo
 	for (size_t i = 0; i < addrlen; ++i) {
 		struct in6_addr prefix = addrs[i].addr;
 		prefix.s6_addr32[1] |= htonl(a->assigned);
+		prefix.s6_addr32[2] = prefix.s6_addr32[3] = 0;
 		odhcpd_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
 				iface, &a->peer.sin6_addr, 1024, add);
 	}
@@ -757,6 +758,7 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
 						.addr = addrs[i].addr
 					};
 					p.addr.s6_addr32[1] |= htonl(a->assigned);
+					p.addr.s6_addr32[2] = p.addr.s6_addr32[3] = 0;
 
 					size_t entrlen = sizeof(p) - 4;
 
@@ -833,6 +835,7 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
 						struct in6_addr addr = addrs[i].addr;
 						if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
 							addr.s6_addr32[1] |= htonl(a->assigned);
+							addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
 
 							if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
 									p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
@@ -965,6 +968,7 @@ static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
 					continue;
 
 				addr.s6_addr32[1] |= htonl(a->assigned);
+				addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
 			}
 
 			inet_ntop(AF_INET6, &addr, addrbuf, sizeof(addrbuf));
diff --git a/src/ndp.c b/src/ndp.c
index 3b472de..97a4713 100644
--- a/src/ndp.c
+++ b/src/ndp.c
@@ -362,8 +362,6 @@ static void check_addr_updates(struct interface *iface)
 	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;
 
diff --git a/src/ubus.c b/src/ubus.c
index e9e2de3..d562c0f 100644
--- a/src/ubus.c
+++ b/src/ubus.c
@@ -107,8 +107,10 @@ static int handle_dhcpv6_leases(_unused struct ubus_context *ctx, _unused struct
 				addr = iface->ia_addr[i].addr;
 				if (lease->length == 128)
 					addr.s6_addr32[3] = htonl(lease->assigned);
-				else
+				else {
 					addr.s6_addr32[1] |= htonl(lease->assigned);
+					addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
+				}
 
 				char *c = blobmsg_alloc_string_buffer(&b, NULL, INET6_ADDRSTRLEN);
 				inet_ntop(AF_INET6, &addr, c, INET6_ADDRSTRLEN);