DHCP6: Implement USE_MULTICAST

diff --git a/src/dhcp6.c b/src/dhcp6.c
index fad22f73dae91664a1fa6d2f9eca300ece284c06..fb4d93619104c78d265eba2259caa86c0335a1fb 100644 (file)
--- a/src/dhcp6.c
+++ b/src/dhcp6.c
@@ -2202,6 +2202,12 @@ dhcp6_checkstatusok(const struct interface *ifp,
        state->lerror = code;
        errno = 0;
 
+       /* RFC 8415 18.2.10 */
+       if (code == D6_STATUS_USEMULTICAST) {
+               logdebugx("%s: server sent USEMULTICAST", ifp->name);
+               state->unicast = in6addr_any;
+       }
+
        /* code cannot be D6_STATUS_OK, so there is a failure */
        if (ifp->ctx->options & DHCPCD_TEST)
                eloop_exit(ifp->ctx->eloop, EXIT_FAILURE);