treewide: reflect managed mode is related to RA

[project/odhcpd.git] / src / dhcpv6.c

diff --git a/src/dhcpv6.c b/src/dhcpv6.c
index 3128968..4ecb54a 100644 (file)
--- a/src/dhcpv6.c
+++ b/src/dhcpv6.c
@@ -90,9 +90,6 @@ int setup_dhcpv6_interface(struct interface *iface, bool enable)
                if (iface->dhcpv6 == RELAYD_SERVER)
                        setsockopt(sock, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &server, sizeof(server));
 
-               if (iface->dhcpv6 != RELAYD_RELAY || !iface->master)
-                       ndp_rqs_addr6_dump();
-
                iface->dhcpv6_event.uloop.fd = sock;
                iface->dhcpv6_event.handle_dgram = handle_dhcpv6;
                odhcpd_register(&iface->dhcpv6_event);
@@ -336,7 +333,7 @@ static void handle_client_request(void *addr, void *data, size_t len,
 
                        if (IN6_IS_ADDR_UNSPECIFIED(&cerid.addr)) {
                                struct odhcpd_ipaddr *addrs;
-                               ssize_t len = odhcpd_get_interface_addresses(0, &addrs);
+                               ssize_t len = odhcpd_get_interface_addresses(0, true, &addrs);
 
                                for (ssize_t i = 0; i < len; ++i)
                                        if (IN6_IS_ADDR_UNSPECIFIED(&cerid.addr)
@@ -483,6 +480,26 @@ static void relay_server_response(uint8_t *data, size_t len)
        odhcpd_send(iface->dhcpv6_event.uloop.fd, &target, &iov, 1, iface);
 }
 
+static struct odhcpd_ipaddr *relay_link_address(struct interface *iface)
+{
+       struct odhcpd_ipaddr *addr = NULL;
+       time_t now = odhcpd_time();
+
+       for (size_t i = 0; i < iface->ia_addr_len; i++) {
+               if (iface->ia_addr[i].valid <= (uint32_t)now)
+                       continue;
+
+               if (iface->ia_addr[i].preferred > (uint32_t)now) {
+                       addr = &iface->ia_addr[i];
+                       break;
+               }
+
+               if (!addr || (iface->ia_addr[i].valid > addr->valid))
+                       addr = &iface->ia_addr[i];
+       }
+
+       return addr;
+}
 
 // Relay client request (regular DHCPv6-relay)
 static void relay_client_request(struct sockaddr_in6 *source,
@@ -522,18 +539,19 @@ static void relay_client_request(struct sockaddr_in6 *source,
        memcpy(&hdr.interface_id_data, &ifindex, sizeof(ifindex));
 
        // Detect public IP of slave interface to use as link-address
-       struct odhcpd_ipaddr *ip = NULL;
-       if (odhcpd_get_interface_addresses(iface->ifindex, &ip) < 1) {
+       struct odhcpd_ipaddr *ip = relay_link_address(iface);
+       if (!ip) {
                // No suitable address! Is the slave not configured yet?
                // Detect public IP of master interface and use it instead
                // This is WRONG and probably violates the RFC. However
                // otherwise we have a hen and egg problem because the
                // slave-interface cannot be auto-configured.
-               if (odhcpd_get_interface_addresses(master->ifindex, &ip) < 1)
+               ip = relay_link_address(master);
+               if (!ip)
                        return; // Could not obtain a suitable address
        }
-       memcpy(&hdr.link_address, &ip[0].addr, sizeof(hdr.link_address));
-       free(ip);
+
+       memcpy(&hdr.link_address, &ip->addr.in6, sizeof(hdr.link_address));
 
        struct sockaddr_in6 dhcpv6_servers = {AF_INET6,
                        htons(DHCPV6_SERVER_PORT), 0, ALL_DHCPV6_SERVERS, 0};