Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 691 insertions, 0 deletions

diff --git a/drivers/net/usb/rndis_host.c b/drivers/net/usb/rndis_host.c
new file mode 100644
index 000000000..7b3739b29
--- /dev/null
+++ b/drivers/net/usb/rndis_host.c
@@ -0,0 +1,691 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Host Side support for RNDIS Networking Links
+ * Copyright (C) 2005 by David Brownell
+ */
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/workqueue.h>
+#include <linux/slab.h>
+#include <linux/mii.h>
+#include <linux/usb.h>
+#include <linux/usb/cdc.h>
+#include <linux/usb/usbnet.h>
+#include <linux/usb/rndis_host.h>
+
+
+/*
+ * RNDIS is NDIS remoted over USB.  It's a MSFT variant of CDC ACM ... of
+ * course ACM was intended for modems, not Ethernet links!  USB's standard
+ * for Ethernet links is "CDC Ethernet", which is significantly simpler.
+ *
+ * NOTE that Microsoft's "RNDIS 1.0" specification is incomplete.  Issues
+ * include:
+ *    - Power management in particular relies on information that's scattered
+ *	through other documentation, and which is incomplete or incorrect even
+ *	there.
+ *    - There are various undocumented protocol requirements, such as the
+ *	need to send unused garbage in control-OUT messages.
+ *    - In some cases, MS-Windows will emit undocumented requests; this
+ *	matters more to peripheral implementations than host ones.
+ *
+ * Moreover there's a no-open-specs variant of RNDIS called "ActiveSync".
+ *
+ * For these reasons and others, ** USE OF RNDIS IS STRONGLY DISCOURAGED ** in
+ * favor of such non-proprietary alternatives as CDC Ethernet or the newer (and
+ * currently rare) "Ethernet Emulation Model" (EEM).
+ */
+
+/*
+ * RNDIS notifications from device: command completion; "reverse"
+ * keepalives; etc
+ */
+void rndis_status(struct usbnet *dev, struct urb *urb)
+{
+	netdev_dbg(dev->net, "rndis status urb, len %d stat %d\n",
+		   urb->actual_length, urb->status);
+	// FIXME for keepalives, respond immediately (asynchronously)
+	// if not an RNDIS status, do like cdc_status(dev,urb) does
+}
+EXPORT_SYMBOL_GPL(rndis_status);
+
+/*
+ * RNDIS indicate messages.
+ */
+static void rndis_msg_indicate(struct usbnet *dev, struct rndis_indicate *msg,
+				int buflen)
+{
+	struct cdc_state *info = (void *)&dev->data;
+	struct device *udev = &info->control->dev;
+
+	if (dev->driver_info->indication) {
+		dev->driver_info->indication(dev, msg, buflen);
+	} else {
+		u32 status = le32_to_cpu(msg->status);
+
+		switch (status) {
+		case RNDIS_STATUS_MEDIA_CONNECT:
+			dev_info(udev, "rndis media connect\n");
+			break;
+		case RNDIS_STATUS_MEDIA_DISCONNECT:
+			dev_info(udev, "rndis media disconnect\n");
+			break;
+		default:
+			dev_info(udev, "rndis indication: 0x%08x\n", status);
+		}
+	}
+}
+
+/*
+ * RPC done RNDIS-style.  Caller guarantees:
+ * - message is properly byteswapped
+ * - there's no other request pending
+ * - buf can hold up to 1KB response (required by RNDIS spec)
+ * On return, the first few entries are already byteswapped.
+ *
+ * Call context is likely probe(), before interface name is known,
+ * which is why we won't try to use it in the diagnostics.
+ */
+int rndis_command(struct usbnet *dev, struct rndis_msg_hdr *buf, int buflen)
+{
+	struct cdc_state	*info = (void *) &dev->data;
+	struct usb_cdc_notification notification;
+	int			master_ifnum;
+	int			retval;
+	int			partial;
+	unsigned		count;
+	u32			xid = 0, msg_len, request_id, msg_type, rsp,
+				status;
+
+	/* REVISIT when this gets called from contexts other than probe() or
+	 * disconnect(): either serialize, or dispatch responses on xid
+	 */
+
+	msg_type = le32_to_cpu(buf->msg_type);
+
+	/* Issue the request; xid is unique, don't bother byteswapping it */
+	if (likely(msg_type != RNDIS_MSG_HALT && msg_type != RNDIS_MSG_RESET)) {
+		xid = dev->xid++;
+		if (!xid)
+			xid = dev->xid++;
+		buf->request_id = (__force __le32) xid;
+	}
+	master_ifnum = info->control->cur_altsetting->desc.bInterfaceNumber;
+	retval = usb_control_msg(dev->udev,
+		usb_sndctrlpipe(dev->udev, 0),
+		USB_CDC_SEND_ENCAPSULATED_COMMAND,
+		USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+		0, master_ifnum,
+		buf, le32_to_cpu(buf->msg_len),
+		RNDIS_CONTROL_TIMEOUT_MS);
+	if (unlikely(retval < 0 || xid == 0))
+		return retval;
+
+	/* Some devices don't respond on the control channel until
+	 * polled on the status channel, so do that first. */
+	if (dev->driver_info->data & RNDIS_DRIVER_DATA_POLL_STATUS) {
+		retval = usb_interrupt_msg(
+			dev->udev,
+			usb_rcvintpipe(dev->udev,
+				       dev->status->desc.bEndpointAddress),
+			&notification, sizeof(notification), &partial,
+			RNDIS_CONTROL_TIMEOUT_MS);
+		if (unlikely(retval < 0))
+			return retval;
+	}
+
+	/* Poll the control channel; the request probably completed immediately */
+	rsp = le32_to_cpu(buf->msg_type) | RNDIS_MSG_COMPLETION;
+	for (count = 0; count < 10; count++) {
+		memset(buf, 0, CONTROL_BUFFER_SIZE);
+		retval = usb_control_msg(dev->udev,
+			usb_rcvctrlpipe(dev->udev, 0),
+			USB_CDC_GET_ENCAPSULATED_RESPONSE,
+			USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+			0, master_ifnum,
+			buf, buflen,
+			RNDIS_CONTROL_TIMEOUT_MS);
+		if (likely(retval >= 8)) {
+			msg_type = le32_to_cpu(buf->msg_type);
+			msg_len = le32_to_cpu(buf->msg_len);
+			status = le32_to_cpu(buf->status);
+			request_id = (__force u32) buf->request_id;
+			if (likely(msg_type == rsp)) {
+				if (likely(request_id == xid)) {
+					if (unlikely(rsp == RNDIS_MSG_RESET_C))
+						return 0;
+					if (likely(RNDIS_STATUS_SUCCESS ==
+							status))
+						return 0;
+					dev_dbg(&info->control->dev,
+						"rndis reply status %08x\n",
+						status);
+					return -EL3RST;
+				}
+				dev_dbg(&info->control->dev,
+					"rndis reply id %d expected %d\n",
+					request_id, xid);
+				/* then likely retry */
+			} else switch (msg_type) {
+			case RNDIS_MSG_INDICATE: /* fault/event */
+				rndis_msg_indicate(dev, (void *)buf, buflen);
+				break;
+			case RNDIS_MSG_KEEPALIVE: { /* ping */
+				struct rndis_keepalive_c *msg = (void *)buf;
+
+				msg->msg_type = cpu_to_le32(RNDIS_MSG_KEEPALIVE_C);
+				msg->msg_len = cpu_to_le32(sizeof *msg);
+				msg->status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
+				retval = usb_control_msg(dev->udev,
+					usb_sndctrlpipe(dev->udev, 0),
+					USB_CDC_SEND_ENCAPSULATED_COMMAND,
+					USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+					0, master_ifnum,
+					msg, sizeof *msg,
+					RNDIS_CONTROL_TIMEOUT_MS);
+				if (unlikely(retval < 0))
+					dev_dbg(&info->control->dev,
+						"rndis keepalive err %d\n",
+						retval);
+				}
+				break;
+			default:
+				dev_dbg(&info->control->dev,
+					"unexpected rndis msg %08x len %d\n",
+					le32_to_cpu(buf->msg_type), msg_len);
+			}
+		} else {
+			/* device probably issued a protocol stall; ignore */
+			dev_dbg(&info->control->dev,
+				"rndis response error, code %d\n", retval);
+		}
+		msleep(40);
+	}
+	dev_dbg(&info->control->dev, "rndis response timeout\n");
+	return -ETIMEDOUT;
+}
+EXPORT_SYMBOL_GPL(rndis_command);
+
+/*
+ * rndis_query:
+ *
+ * Performs a query for @oid along with 0 or more bytes of payload as
+ * specified by @in_len. If @reply_len is not set to -1 then the reply
+ * length is checked against this value, resulting in an error if it
+ * doesn't match.
+ *
+ * NOTE: Adding a payload exactly or greater than the size of the expected
+ * response payload is an evident requirement MSFT added for ActiveSync.
+ *
+ * The only exception is for OIDs that return a variably sized response,
+ * in which case no payload should be added.  This undocumented (and
+ * nonsensical!) issue was found by sniffing protocol requests from the
+ * ActiveSync 4.1 Windows driver.
+ */
+static int rndis_query(struct usbnet *dev, struct usb_interface *intf,
+		void *buf, u32 oid, u32 in_len,
+		void **reply, int *reply_len)
+{
+	int retval;
+	union {
+		void			*buf;
+		struct rndis_msg_hdr	*header;
+		struct rndis_query	*get;
+		struct rndis_query_c	*get_c;
+	} u;
+	u32 off, len;
+
+	u.buf = buf;
+
+	memset(u.get, 0, sizeof *u.get + in_len);
+	u.get->msg_type = cpu_to_le32(RNDIS_MSG_QUERY);
+	u.get->msg_len = cpu_to_le32(sizeof *u.get + in_len);
+	u.get->oid = cpu_to_le32(oid);
+	u.get->len = cpu_to_le32(in_len);
+	u.get->offset = cpu_to_le32(20);
+
+	retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
+	if (unlikely(retval < 0)) {
+		dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) failed, %d\n",
+				oid, retval);
+		return retval;
+	}
+
+	off = le32_to_cpu(u.get_c->offset);
+	len = le32_to_cpu(u.get_c->len);
+	if (unlikely((off > CONTROL_BUFFER_SIZE - 8) ||
+		     (len > CONTROL_BUFFER_SIZE - 8 - off)))
+		goto response_error;
+
+	if (*reply_len != -1 && len != *reply_len)
+		goto response_error;
+
+	*reply = (unsigned char *) &u.get_c->request_id + off;
+	*reply_len = len;
+
+	return retval;
+
+response_error:
+	dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) "
+			"invalid response - off %d len %d\n",
+		oid, off, len);
+	return -EDOM;
+}
+
+/* same as usbnet_netdev_ops but MTU change not allowed */
+static const struct net_device_ops rndis_netdev_ops = {
+	.ndo_open		= usbnet_open,
+	.ndo_stop		= usbnet_stop,
+	.ndo_start_xmit		= usbnet_start_xmit,
+	.ndo_tx_timeout		= usbnet_tx_timeout,
+	.ndo_get_stats64	= dev_get_tstats64,
+	.ndo_set_mac_address 	= eth_mac_addr,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
+int
+generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
+{
+	int			retval;
+	struct net_device	*net = dev->net;
+	struct cdc_state	*info = (void *) &dev->data;
+	union {
+		void			*buf;
+		struct rndis_msg_hdr	*header;
+		struct rndis_init	*init;
+		struct rndis_init_c	*init_c;
+		struct rndis_query	*get;
+		struct rndis_query_c	*get_c;
+		struct rndis_set	*set;
+		struct rndis_set_c	*set_c;
+		struct rndis_halt	*halt;
+	} u;
+	u32			tmp;
+	__le32			phym_unspec, *phym;
+	int			reply_len;
+	unsigned char		*bp;
+
+	/* we can't rely on i/o from stack working, or stack allocation */
+	u.buf = kmalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
+	if (!u.buf)
+		return -ENOMEM;
+	retval = usbnet_generic_cdc_bind(dev, intf);
+	if (retval < 0)
+		goto fail;
+
+	u.init->msg_type = cpu_to_le32(RNDIS_MSG_INIT);
+	u.init->msg_len = cpu_to_le32(sizeof *u.init);
+	u.init->major_version = cpu_to_le32(1);
+	u.init->minor_version = cpu_to_le32(0);
+
+	/* max transfer (in spec) is 0x4000 at full speed, but for
+	 * TX we'll stick to one Ethernet packet plus RNDIS framing.
+	 * For RX we handle drivers that zero-pad to end-of-packet.
+	 * Don't let userspace change these settings.
+	 *
+	 * NOTE: there still seems to be weirdness here, as if we need
+	 * to do some more things to make sure WinCE targets accept this.
+	 * They default to jumbograms of 8KB or 16KB, which is absurd
+	 * for such low data rates and which is also more than Linux
+	 * can usually expect to allocate for SKB data...
+	 */
+	net->hard_header_len += sizeof (struct rndis_data_hdr);
+	dev->hard_mtu = net->mtu + net->hard_header_len;
+
+	dev->maxpacket = usb_maxpacket(dev->udev, dev->out);
+	if (dev->maxpacket == 0) {
+		netif_dbg(dev, probe, dev->net,
+			  "dev->maxpacket can't be 0\n");
+		retval = -EINVAL;
+		goto fail_and_release;
+	}
+
+	dev->rx_urb_size = dev->hard_mtu + (dev->maxpacket + 1);
+	dev->rx_urb_size &= ~(dev->maxpacket - 1);
+	u.init->max_transfer_size = cpu_to_le32(dev->rx_urb_size);
+
+	net->netdev_ops = &rndis_netdev_ops;
+
+	retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
+	if (unlikely(retval < 0)) {
+		/* it might not even be an RNDIS device!! */
+		dev_err(&intf->dev, "RNDIS init failed, %d\n", retval);
+		goto fail_and_release;
+	}
+	tmp = le32_to_cpu(u.init_c->max_transfer_size);
+	if (tmp < dev->hard_mtu) {
+		if (tmp <= net->hard_header_len) {
+			dev_err(&intf->dev,
+				"dev can't take %u byte packets (max %u)\n",
+				dev->hard_mtu, tmp);
+			retval = -EINVAL;
+			goto halt_fail_and_release;
+		}
+		dev_warn(&intf->dev,
+			 "dev can't take %u byte packets (max %u), "
+			 "adjusting MTU to %u\n",
+			 dev->hard_mtu, tmp, tmp - net->hard_header_len);
+		dev->hard_mtu = tmp;
+		net->mtu = dev->hard_mtu - net->hard_header_len;
+	}
+
+	/* REVISIT:  peripheral "alignment" request is ignored ... */
+	dev_dbg(&intf->dev,
+		"hard mtu %u (%u from dev), rx buflen %zu, align %d\n",
+		dev->hard_mtu, tmp, dev->rx_urb_size,
+		1 << le32_to_cpu(u.init_c->packet_alignment));
+
+	/* module has some device initialization code needs to be done right
+	 * after RNDIS_INIT */
+	if (dev->driver_info->early_init &&
+			dev->driver_info->early_init(dev) != 0)
+		goto halt_fail_and_release;
+
+	/* Check physical medium */
+	phym = NULL;
+	reply_len = sizeof *phym;
+	retval = rndis_query(dev, intf, u.buf,
+			     RNDIS_OID_GEN_PHYSICAL_MEDIUM,
+			     reply_len, (void **)&phym, &reply_len);
+	if (retval != 0 || !phym) {
+		/* OID is optional so don't fail here. */
+		phym_unspec = cpu_to_le32(RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED);
+		phym = &phym_unspec;
+	}
+	if ((flags & FLAG_RNDIS_PHYM_WIRELESS) &&
+	    le32_to_cpup(phym) != RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
+		netif_dbg(dev, probe, dev->net,
+			  "driver requires wireless physical medium, but device is not\n");
+		retval = -ENODEV;
+		goto halt_fail_and_release;
+	}
+	if ((flags & FLAG_RNDIS_PHYM_NOT_WIRELESS) &&
+	    le32_to_cpup(phym) == RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
+		netif_dbg(dev, probe, dev->net,
+			  "driver requires non-wireless physical medium, but device is wireless.\n");
+		retval = -ENODEV;
+		goto halt_fail_and_release;
+	}
+
+	/* Get designated host ethernet address */
+	reply_len = ETH_ALEN;
+	retval = rndis_query(dev, intf, u.buf,
+			     RNDIS_OID_802_3_PERMANENT_ADDRESS,
+			     48, (void **) &bp, &reply_len);
+	if (unlikely(retval< 0)) {
+		dev_err(&intf->dev, "rndis get ethaddr, %d\n", retval);
+		goto halt_fail_and_release;
+	}
+
+	eth_hw_addr_set(net, bp);
+
+	/* set a nonzero filter to enable data transfers */
+	memset(u.set, 0, sizeof *u.set);
+	u.set->msg_type = cpu_to_le32(RNDIS_MSG_SET);
+	u.set->msg_len = cpu_to_le32(4 + sizeof *u.set);
+	u.set->oid = cpu_to_le32(RNDIS_OID_GEN_CURRENT_PACKET_FILTER);
+	u.set->len = cpu_to_le32(4);
+	u.set->offset = cpu_to_le32((sizeof *u.set) - 8);
+	*(__le32 *)(u.buf + sizeof *u.set) = cpu_to_le32(RNDIS_DEFAULT_FILTER);
+
+	retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
+	if (unlikely(retval < 0)) {
+		dev_err(&intf->dev, "rndis set packet filter, %d\n", retval);
+		goto halt_fail_and_release;
+	}
+
+	retval = 0;
+
+	kfree(u.buf);
+	return retval;
+
+halt_fail_and_release:
+	memset(u.halt, 0, sizeof *u.halt);
+	u.halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
+	u.halt->msg_len = cpu_to_le32(sizeof *u.halt);
+	(void) rndis_command(dev, (void *)u.halt, CONTROL_BUFFER_SIZE);
+fail_and_release:
+	usb_set_intfdata(info->data, NULL);
+	usb_driver_release_interface(driver_of(intf), info->data);
+	info->data = NULL;
+fail:
+	kfree(u.buf);
+	return retval;
+}
+EXPORT_SYMBOL_GPL(generic_rndis_bind);
+
+static int rndis_bind(struct usbnet *dev, struct usb_interface *intf)
+{
+	return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS);
+}
+
+static int zte_rndis_bind(struct usbnet *dev, struct usb_interface *intf)
+{
+	int status = rndis_bind(dev, intf);
+
+	if (!status && (dev->net->dev_addr[0] & 0x02))
+		eth_hw_addr_random(dev->net);
+
+	return status;
+}
+
+void rndis_unbind(struct usbnet *dev, struct usb_interface *intf)
+{
+	struct rndis_halt	*halt;
+
+	/* try to clear any rndis state/activity (no i/o from stack!) */
+	halt = kzalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
+	if (halt) {
+		halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
+		halt->msg_len = cpu_to_le32(sizeof *halt);
+		(void) rndis_command(dev, (void *)halt, CONTROL_BUFFER_SIZE);
+		kfree(halt);
+	}
+
+	usbnet_cdc_unbind(dev, intf);
+}
+EXPORT_SYMBOL_GPL(rndis_unbind);
+
+/*
+ * DATA -- host must not write zlps
+ */
+int rndis_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
+{
+	bool dst_mac_fixup;
+
+	/* This check is no longer done by usbnet */
+	if (skb->len < dev->net->hard_header_len)
+		return 0;
+
+	dst_mac_fixup = !!(dev->driver_info->data & RNDIS_DRIVER_DATA_DST_MAC_FIXUP);
+
+	/* peripheral may have batched packets to us... */
+	while (likely(skb->len)) {
+		struct rndis_data_hdr	*hdr = (void *)skb->data;
+		struct sk_buff		*skb2;
+		u32			msg_type, msg_len, data_offset, data_len;
+
+		msg_type = le32_to_cpu(hdr->msg_type);
+		msg_len = le32_to_cpu(hdr->msg_len);
+		data_offset = le32_to_cpu(hdr->data_offset);
+		data_len = le32_to_cpu(hdr->data_len);
+
+		/* don't choke if we see oob, per-packet data, etc */
+		if (unlikely(msg_type != RNDIS_MSG_PACKET || skb->len < msg_len
+				|| (data_offset + data_len + 8) > msg_len)) {
+			dev->net->stats.rx_frame_errors++;
+			netdev_dbg(dev->net, "bad rndis message %d/%d/%d/%d, len %d\n",
+				   le32_to_cpu(hdr->msg_type),
+				   msg_len, data_offset, data_len, skb->len);
+			return 0;
+		}
+		skb_pull(skb, 8 + data_offset);
+
+		/* at most one packet left? */
+		if (likely((data_len - skb->len) <= sizeof *hdr)) {
+			skb_trim(skb, data_len);
+			break;
+		}
+
+		/* try to return all the packets in the batch */
+		skb2 = skb_clone(skb, GFP_ATOMIC);
+		if (unlikely(!skb2))
+			break;
+		skb_pull(skb, msg_len - sizeof *hdr);
+		skb_trim(skb2, data_len);
+
+		if (unlikely(dst_mac_fixup))
+			usbnet_cdc_zte_rx_fixup(dev, skb2);
+
+		usbnet_skb_return(dev, skb2);
+	}
+
+	/* caller will usbnet_skb_return the remaining packet */
+	if (unlikely(dst_mac_fixup))
+		usbnet_cdc_zte_rx_fixup(dev, skb);
+
+	return 1;
+}
+EXPORT_SYMBOL_GPL(rndis_rx_fixup);
+
+struct sk_buff *
+rndis_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
+{
+	struct rndis_data_hdr	*hdr;
+	struct sk_buff		*skb2;
+	unsigned		len = skb->len;
+
+	if (likely(!skb_cloned(skb))) {
+		int	room = skb_headroom(skb);
+
+		/* enough head room as-is? */
+		if (unlikely((sizeof *hdr) <= room))
+			goto fill;
+
+		/* enough room, but needs to be readjusted? */
+		room += skb_tailroom(skb);
+		if (likely((sizeof *hdr) <= room)) {
+			skb->data = memmove(skb->head + sizeof *hdr,
+					    skb->data, len);
+			skb_set_tail_pointer(skb, len);
+			goto fill;
+		}
+	}
+
+	/* create a new skb, with the correct size (and tailpad) */
+	skb2 = skb_copy_expand(skb, sizeof *hdr, 1, flags);
+	dev_kfree_skb_any(skb);
+	if (unlikely(!skb2))
+		return skb2;
+	skb = skb2;
+
+	/* fill out the RNDIS header.  we won't bother trying to batch
+	 * packets; Linux minimizes wasted bandwidth through tx queues.
+	 */
+fill:
+	hdr = __skb_push(skb, sizeof *hdr);
+	memset(hdr, 0, sizeof *hdr);
+	hdr->msg_type = cpu_to_le32(RNDIS_MSG_PACKET);
+	hdr->msg_len = cpu_to_le32(skb->len);
+	hdr->data_offset = cpu_to_le32(sizeof(*hdr) - 8);
+	hdr->data_len = cpu_to_le32(len);
+
+	/* FIXME make the last packet always be short ... */
+	return skb;
+}
+EXPORT_SYMBOL_GPL(rndis_tx_fixup);
+
+
+static const struct driver_info	rndis_info = {
+	.description =	"RNDIS device",
+	.flags =	FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
+	.bind =		rndis_bind,
+	.unbind =	rndis_unbind,
+	.status =	rndis_status,
+	.rx_fixup =	rndis_rx_fixup,
+	.tx_fixup =	rndis_tx_fixup,
+};
+
+static const struct driver_info	rndis_poll_status_info = {
+	.description =	"RNDIS device (poll status before control)",
+	.flags =	FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
+	.data =		RNDIS_DRIVER_DATA_POLL_STATUS,
+	.bind =		rndis_bind,
+	.unbind =	rndis_unbind,
+	.status =	rndis_status,
+	.rx_fixup =	rndis_rx_fixup,
+	.tx_fixup =	rndis_tx_fixup,
+};
+
+static const struct driver_info	zte_rndis_info = {
+	.description =	"ZTE RNDIS device",
+	.flags =	FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
+	.data =		RNDIS_DRIVER_DATA_DST_MAC_FIXUP,
+	.bind =		zte_rndis_bind,
+	.unbind =	rndis_unbind,
+	.status =	rndis_status,
+	.rx_fixup =	rndis_rx_fixup,
+	.tx_fixup =	rndis_tx_fixup,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static const struct usb_device_id	products [] = {
+{
+	/* 2Wire HomePortal 1000SW */
+	USB_DEVICE_AND_INTERFACE_INFO(0x1630, 0x0042,
+				      USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
+	.driver_info = (unsigned long) &rndis_poll_status_info,
+}, {
+	/* Hytera Communications DMR radios' "Radio to PC Network" */
+	USB_VENDOR_AND_INTERFACE_INFO(0x238b,
+				      USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
+	.driver_info = (unsigned long)&rndis_info,
+}, {
+	/* ZTE WWAN modules */
+	USB_VENDOR_AND_INTERFACE_INFO(0x19d2,
+				      USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
+	.driver_info = (unsigned long)&zte_rndis_info,
+}, {
+	/* ZTE WWAN modules, ACM flavour */
+	USB_VENDOR_AND_INTERFACE_INFO(0x19d2,
+				      USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
+	.driver_info = (unsigned long)&zte_rndis_info,
+}, {
+	/* RNDIS is MSFT's un-official variant of CDC ACM */
+	USB_INTERFACE_INFO(USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
+	.driver_info = (unsigned long) &rndis_info,
+}, {
+	/* "ActiveSync" is an undocumented variant of RNDIS, used in WM5 */
+	USB_INTERFACE_INFO(USB_CLASS_MISC, 1, 1),
+	.driver_info = (unsigned long) &rndis_poll_status_info,
+}, {
+	/* RNDIS for tethering */
+	USB_INTERFACE_INFO(USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
+	.driver_info = (unsigned long) &rndis_info,
+}, {
+	/* Novatel Verizon USB730L */
+	USB_INTERFACE_INFO(USB_CLASS_MISC, 4, 1),
+	.driver_info = (unsigned long) &rndis_info,
+},
+	{ },		// END
+};
+MODULE_DEVICE_TABLE(usb, products);
+
+static struct usb_driver rndis_driver = {
+	.name =		"rndis_host",
+	.id_table =	products,
+	.probe =	usbnet_probe,
+	.disconnect =	usbnet_disconnect,
+	.suspend =	usbnet_suspend,
+	.resume =	usbnet_resume,
+	.disable_hub_initiated_lpm = 1,
+};
+
+module_usb_driver(rndis_driver);
+
+MODULE_AUTHOR("David Brownell");
+MODULE_DESCRIPTION("USB Host side RNDIS driver");
+MODULE_LICENSE("GPL");