@@ -536,35 +536,10 @@ dco_do_read(dco_context_t *dco)

 int

 dco_do_write(dco_context_t *dco, int peer_id, struct buffer *buf)

 {

-    struct ifdrv drv;

-    nvlist_t *nvl;

-    int ret;

-

-    nvl = nvlist_create(0);

-

-    nvlist_add_binary(nvl, "packet", BSTR(buf), BLEN(buf));

-    nvlist_add_number(nvl, "peerid", peer_id);

-

-    CLEAR(drv);

-    snprintf(drv.ifd_name, IFNAMSIZ, "%s", dco->ifname);

-    drv.ifd_cmd = OVPN_SEND_PKT;

-    drv.ifd_data = nvlist_pack(nvl, &drv.ifd_len);

-

-    ret = ioctl(dco->fd, SIOCSDRVSPEC, &drv);

-    if (ret)

-    {

-        msg(M_WARN | M_ERRNO, "Failed to send control packet");

-        ret = -errno;

-    }

-    else

-    {

-        ret = BLEN(buf);

-    }

-

-    free(drv.ifd_data);

-    nvlist_destroy(nvl);

-

-    return ret;

+    /* Control packets are passed through the socket, so this should never get

+     * called. See should_use_dco_socket(). */

+    ASSERT(0);

+    return -EINVAL;

 }

 bool

@@ -1635,20 +1635,23 @@ process_ip_header(struct context *c, unsigned int flags, struct buffer *buf)

     }

 }

-/* Linux-like DCO implementations pass the socket to the kernel and

+/* Linux DCO implementations pass the socket to the kernel and

  * disallow usage of it from userland, so (control) packets sent and

  * received by OpenVPN need to go through the DCO interface.

  *

  * Windows DCO needs control packets to be sent via the normal

  * standard Overlapped I/O.

  *

+ * FreeBSD DCO allows control packets to pass through the socket in both

+ * directions.

+ *

  * Hide that complexity (...especially if more platforms show up

  * in the future...) in a small inline function.

  */

 static inline bool

 should_use_dco_socket(struct link_socket_actual *actual)

 {

-#if defined(TARGET_LINUX) || defined(TARGET_FREEBSD)

+#if defined(TARGET_LINUX)

     return actual->dco_installed;

 #else

     return false;