![Harvey Harrison](/assets/img/avatar_default.png)
Use cpu_to_le32 directly as it handles constant folding now, replace direct uses of __constant_cpu_to_{endian} as well. Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: David S. Miller <davem@davemloft.net>
609 lines
18 KiB
C
609 lines
18 KiB
C
/*
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* Host Side support for RNDIS Networking Links
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* Copyright (C) 2005 by David Brownell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/workqueue.h>
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#include <linux/mii.h>
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#include <linux/usb.h>
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#include <linux/usb/cdc.h>
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#include <linux/usb/usbnet.h>
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#include <linux/usb/rndis_host.h>
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/*
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* RNDIS is NDIS remoted over USB. It's a MSFT variant of CDC ACM ... of
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* course ACM was intended for modems, not Ethernet links! USB's standard
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* for Ethernet links is "CDC Ethernet", which is significantly simpler.
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*
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* NOTE that Microsoft's "RNDIS 1.0" specification is incomplete. Issues
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* include:
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* - Power management in particular relies on information that's scattered
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* through other documentation, and which is incomplete or incorrect even
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* there.
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* - There are various undocumented protocol requirements, such as the
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* need to send unused garbage in control-OUT messages.
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* - In some cases, MS-Windows will emit undocumented requests; this
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* matters more to peripheral implementations than host ones.
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*
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* Moreover there's a no-open-specs variant of RNDIS called "ActiveSync".
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*
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* For these reasons and others, ** USE OF RNDIS IS STRONGLY DISCOURAGED ** in
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* favor of such non-proprietary alternatives as CDC Ethernet or the newer (and
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* currently rare) "Ethernet Emulation Model" (EEM).
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*/
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/*
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* RNDIS notifications from device: command completion; "reverse"
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* keepalives; etc
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*/
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void rndis_status(struct usbnet *dev, struct urb *urb)
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{
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devdbg(dev, "rndis status urb, len %d stat %d",
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urb->actual_length, urb->status);
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// FIXME for keepalives, respond immediately (asynchronously)
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// if not an RNDIS status, do like cdc_status(dev,urb) does
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}
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EXPORT_SYMBOL_GPL(rndis_status);
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/*
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* RPC done RNDIS-style. Caller guarantees:
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* - message is properly byteswapped
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* - there's no other request pending
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* - buf can hold up to 1KB response (required by RNDIS spec)
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* On return, the first few entries are already byteswapped.
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*
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* Call context is likely probe(), before interface name is known,
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* which is why we won't try to use it in the diagnostics.
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*/
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int rndis_command(struct usbnet *dev, struct rndis_msg_hdr *buf, int buflen)
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{
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struct cdc_state *info = (void *) &dev->data;
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int master_ifnum;
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int retval;
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unsigned count;
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__le32 rsp;
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u32 xid = 0, msg_len, request_id;
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/* REVISIT when this gets called from contexts other than probe() or
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* disconnect(): either serialize, or dispatch responses on xid
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*/
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/* Issue the request; xid is unique, don't bother byteswapping it */
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if (likely(buf->msg_type != RNDIS_MSG_HALT
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&& buf->msg_type != RNDIS_MSG_RESET)) {
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xid = dev->xid++;
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if (!xid)
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xid = dev->xid++;
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buf->request_id = (__force __le32) xid;
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}
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master_ifnum = info->control->cur_altsetting->desc.bInterfaceNumber;
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retval = usb_control_msg(dev->udev,
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usb_sndctrlpipe(dev->udev, 0),
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USB_CDC_SEND_ENCAPSULATED_COMMAND,
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USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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0, master_ifnum,
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buf, le32_to_cpu(buf->msg_len),
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RNDIS_CONTROL_TIMEOUT_MS);
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if (unlikely(retval < 0 || xid == 0))
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return retval;
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// FIXME Seems like some devices discard responses when
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// we time out and cancel our "get response" requests...
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// so, this is fragile. Probably need to poll for status.
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/* ignore status endpoint, just poll the control channel;
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* the request probably completed immediately
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*/
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rsp = buf->msg_type | RNDIS_MSG_COMPLETION;
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for (count = 0; count < 10; count++) {
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memset(buf, 0, CONTROL_BUFFER_SIZE);
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retval = usb_control_msg(dev->udev,
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usb_rcvctrlpipe(dev->udev, 0),
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USB_CDC_GET_ENCAPSULATED_RESPONSE,
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USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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0, master_ifnum,
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buf, buflen,
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RNDIS_CONTROL_TIMEOUT_MS);
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if (likely(retval >= 8)) {
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msg_len = le32_to_cpu(buf->msg_len);
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request_id = (__force u32) buf->request_id;
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if (likely(buf->msg_type == rsp)) {
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if (likely(request_id == xid)) {
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if (unlikely(rsp == RNDIS_MSG_RESET_C))
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return 0;
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if (likely(RNDIS_STATUS_SUCCESS
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== buf->status))
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return 0;
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dev_dbg(&info->control->dev,
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"rndis reply status %08x\n",
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le32_to_cpu(buf->status));
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return -EL3RST;
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}
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dev_dbg(&info->control->dev,
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"rndis reply id %d expected %d\n",
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request_id, xid);
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/* then likely retry */
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} else switch (buf->msg_type) {
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case RNDIS_MSG_INDICATE: { /* fault/event */
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struct rndis_indicate *msg = (void *)buf;
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int state = 0;
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switch (msg->status) {
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case RNDIS_STATUS_MEDIA_CONNECT:
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state = 1;
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case RNDIS_STATUS_MEDIA_DISCONNECT:
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dev_info(&info->control->dev,
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"rndis media %sconnect\n",
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!state?"dis":"");
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if (dev->driver_info->link_change)
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dev->driver_info->link_change(
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dev, state);
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break;
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default:
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dev_info(&info->control->dev,
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"rndis indication: 0x%08x\n",
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le32_to_cpu(msg->status));
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}
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}
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break;
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case RNDIS_MSG_KEEPALIVE: { /* ping */
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struct rndis_keepalive_c *msg = (void *)buf;
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msg->msg_type = RNDIS_MSG_KEEPALIVE_C;
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msg->msg_len = cpu_to_le32(sizeof *msg);
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msg->status = RNDIS_STATUS_SUCCESS;
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retval = usb_control_msg(dev->udev,
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usb_sndctrlpipe(dev->udev, 0),
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USB_CDC_SEND_ENCAPSULATED_COMMAND,
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USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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0, master_ifnum,
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msg, sizeof *msg,
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RNDIS_CONTROL_TIMEOUT_MS);
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if (unlikely(retval < 0))
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dev_dbg(&info->control->dev,
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"rndis keepalive err %d\n",
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retval);
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}
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break;
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default:
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dev_dbg(&info->control->dev,
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"unexpected rndis msg %08x len %d\n",
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le32_to_cpu(buf->msg_type), msg_len);
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}
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} else {
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/* device probably issued a protocol stall; ignore */
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dev_dbg(&info->control->dev,
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"rndis response error, code %d\n", retval);
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}
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msleep(20);
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}
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dev_dbg(&info->control->dev, "rndis response timeout\n");
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return -ETIMEDOUT;
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}
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EXPORT_SYMBOL_GPL(rndis_command);
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/*
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* rndis_query:
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*
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* Performs a query for @oid along with 0 or more bytes of payload as
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* specified by @in_len. If @reply_len is not set to -1 then the reply
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* length is checked against this value, resulting in an error if it
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* doesn't match.
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*
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* NOTE: Adding a payload exactly or greater than the size of the expected
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* response payload is an evident requirement MSFT added for ActiveSync.
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*
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* The only exception is for OIDs that return a variably sized response,
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* in which case no payload should be added. This undocumented (and
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* nonsensical!) issue was found by sniffing protocol requests from the
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* ActiveSync 4.1 Windows driver.
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*/
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static int rndis_query(struct usbnet *dev, struct usb_interface *intf,
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void *buf, __le32 oid, u32 in_len,
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void **reply, int *reply_len)
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{
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int retval;
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union {
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void *buf;
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struct rndis_msg_hdr *header;
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struct rndis_query *get;
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struct rndis_query_c *get_c;
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} u;
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u32 off, len;
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u.buf = buf;
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memset(u.get, 0, sizeof *u.get + in_len);
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u.get->msg_type = RNDIS_MSG_QUERY;
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u.get->msg_len = cpu_to_le32(sizeof *u.get + in_len);
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u.get->oid = oid;
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u.get->len = cpu_to_le32(in_len);
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u.get->offset = cpu_to_le32(20);
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retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
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if (unlikely(retval < 0)) {
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dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) failed, %d\n",
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oid, retval);
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return retval;
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}
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off = le32_to_cpu(u.get_c->offset);
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len = le32_to_cpu(u.get_c->len);
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if (unlikely((8 + off + len) > CONTROL_BUFFER_SIZE))
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goto response_error;
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if (*reply_len != -1 && len != *reply_len)
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goto response_error;
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*reply = (unsigned char *) &u.get_c->request_id + off;
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*reply_len = len;
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return retval;
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response_error:
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dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) "
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"invalid response - off %d len %d\n",
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oid, off, len);
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return -EDOM;
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}
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int
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generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
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{
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int retval;
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struct net_device *net = dev->net;
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struct cdc_state *info = (void *) &dev->data;
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union {
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void *buf;
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struct rndis_msg_hdr *header;
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struct rndis_init *init;
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struct rndis_init_c *init_c;
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struct rndis_query *get;
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struct rndis_query_c *get_c;
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struct rndis_set *set;
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struct rndis_set_c *set_c;
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struct rndis_halt *halt;
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} u;
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u32 tmp;
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__le32 phym_unspec, *phym;
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int reply_len;
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unsigned char *bp;
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/* we can't rely on i/o from stack working, or stack allocation */
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u.buf = kmalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
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if (!u.buf)
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return -ENOMEM;
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retval = usbnet_generic_cdc_bind(dev, intf);
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if (retval < 0)
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goto fail;
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u.init->msg_type = RNDIS_MSG_INIT;
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u.init->msg_len = cpu_to_le32(sizeof *u.init);
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u.init->major_version = cpu_to_le32(1);
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u.init->minor_version = cpu_to_le32(0);
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/* max transfer (in spec) is 0x4000 at full speed, but for
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* TX we'll stick to one Ethernet packet plus RNDIS framing.
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* For RX we handle drivers that zero-pad to end-of-packet.
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* Don't let userspace change these settings.
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*
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* NOTE: there still seems to be wierdness here, as if we need
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* to do some more things to make sure WinCE targets accept this.
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* They default to jumbograms of 8KB or 16KB, which is absurd
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* for such low data rates and which is also more than Linux
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* can usually expect to allocate for SKB data...
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*/
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net->hard_header_len += sizeof (struct rndis_data_hdr);
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dev->hard_mtu = net->mtu + net->hard_header_len;
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dev->maxpacket = usb_maxpacket(dev->udev, dev->out, 1);
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if (dev->maxpacket == 0) {
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if (netif_msg_probe(dev))
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dev_dbg(&intf->dev, "dev->maxpacket can't be 0\n");
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retval = -EINVAL;
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goto fail_and_release;
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}
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dev->rx_urb_size = dev->hard_mtu + (dev->maxpacket + 1);
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dev->rx_urb_size &= ~(dev->maxpacket - 1);
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u.init->max_transfer_size = cpu_to_le32(dev->rx_urb_size);
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net->change_mtu = NULL;
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retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
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if (unlikely(retval < 0)) {
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/* it might not even be an RNDIS device!! */
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dev_err(&intf->dev, "RNDIS init failed, %d\n", retval);
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goto fail_and_release;
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}
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tmp = le32_to_cpu(u.init_c->max_transfer_size);
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if (tmp < dev->hard_mtu) {
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if (tmp <= net->hard_header_len) {
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dev_err(&intf->dev,
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"dev can't take %u byte packets (max %u)\n",
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dev->hard_mtu, tmp);
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retval = -EINVAL;
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goto halt_fail_and_release;
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}
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dev->hard_mtu = tmp;
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net->mtu = dev->hard_mtu - net->hard_header_len;
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dev_warn(&intf->dev,
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"dev can't take %u byte packets (max %u), "
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"adjusting MTU to %u\n",
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dev->hard_mtu, tmp, net->mtu);
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}
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/* REVISIT: peripheral "alignment" request is ignored ... */
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dev_dbg(&intf->dev,
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"hard mtu %u (%u from dev), rx buflen %Zu, align %d\n",
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dev->hard_mtu, tmp, dev->rx_urb_size,
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1 << le32_to_cpu(u.init_c->packet_alignment));
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/* module has some device initialization code needs to be done right
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* after RNDIS_INIT */
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if (dev->driver_info->early_init &&
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dev->driver_info->early_init(dev) != 0)
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goto halt_fail_and_release;
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/* Check physical medium */
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phym = NULL;
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reply_len = sizeof *phym;
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retval = rndis_query(dev, intf, u.buf, OID_GEN_PHYSICAL_MEDIUM,
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0, (void **) &phym, &reply_len);
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if (retval != 0 || !phym) {
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/* OID is optional so don't fail here. */
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phym_unspec = RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED;
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phym = &phym_unspec;
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}
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if ((flags & FLAG_RNDIS_PHYM_WIRELESS) &&
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*phym != RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
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if (netif_msg_probe(dev))
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dev_dbg(&intf->dev, "driver requires wireless "
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"physical medium, but device is not.\n");
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retval = -ENODEV;
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goto halt_fail_and_release;
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}
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if ((flags & FLAG_RNDIS_PHYM_NOT_WIRELESS) &&
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*phym == RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
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if (netif_msg_probe(dev))
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dev_dbg(&intf->dev, "driver requires non-wireless "
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"physical medium, but device is wireless.\n");
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retval = -ENODEV;
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goto halt_fail_and_release;
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}
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/* Get designated host ethernet address */
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reply_len = ETH_ALEN;
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retval = rndis_query(dev, intf, u.buf, OID_802_3_PERMANENT_ADDRESS,
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48, (void **) &bp, &reply_len);
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if (unlikely(retval< 0)) {
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dev_err(&intf->dev, "rndis get ethaddr, %d\n", retval);
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goto halt_fail_and_release;
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}
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memcpy(net->dev_addr, bp, ETH_ALEN);
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/* set a nonzero filter to enable data transfers */
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memset(u.set, 0, sizeof *u.set);
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u.set->msg_type = RNDIS_MSG_SET;
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u.set->msg_len = cpu_to_le32(4 + sizeof *u.set);
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u.set->oid = OID_GEN_CURRENT_PACKET_FILTER;
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u.set->len = cpu_to_le32(4);
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u.set->offset = cpu_to_le32((sizeof *u.set) - 8);
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*(__le32 *)(u.buf + sizeof *u.set) = RNDIS_DEFAULT_FILTER;
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retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
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if (unlikely(retval < 0)) {
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dev_err(&intf->dev, "rndis set packet filter, %d\n", retval);
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goto halt_fail_and_release;
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}
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retval = 0;
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kfree(u.buf);
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return retval;
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halt_fail_and_release:
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memset(u.halt, 0, sizeof *u.halt);
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u.halt->msg_type = RNDIS_MSG_HALT;
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u.halt->msg_len = cpu_to_le32(sizeof *u.halt);
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(void) rndis_command(dev, (void *)u.halt, CONTROL_BUFFER_SIZE);
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fail_and_release:
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usb_set_intfdata(info->data, NULL);
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usb_driver_release_interface(driver_of(intf), info->data);
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info->data = NULL;
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fail:
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kfree(u.buf);
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return retval;
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}
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EXPORT_SYMBOL_GPL(generic_rndis_bind);
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static int rndis_bind(struct usbnet *dev, struct usb_interface *intf)
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{
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return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS);
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}
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void rndis_unbind(struct usbnet *dev, struct usb_interface *intf)
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{
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struct rndis_halt *halt;
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/* try to clear any rndis state/activity (no i/o from stack!) */
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halt = kzalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
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if (halt) {
|
|
halt->msg_type = 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)
|
|
{
|
|
/* 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_len, data_offset, data_len;
|
|
|
|
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(hdr->msg_type != RNDIS_MSG_PACKET
|
|
|| skb->len < msg_len
|
|
|| (data_offset + data_len + 8) > msg_len)) {
|
|
dev->stats.rx_frame_errors++;
|
|
devdbg(dev, "bad rndis message %d/%d/%d/%d, len %d",
|
|
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);
|
|
usbnet_skb_return(dev, skb2);
|
|
}
|
|
|
|
/* caller will usbnet_skb_return the remaining packet */
|
|
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 = (void *) __skb_push(skb, sizeof *hdr);
|
|
memset(hdr, 0, sizeof *hdr);
|
|
hdr->msg_type = 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_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 usb_device_id products [] = {
|
|
{
|
|
/* 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_info,
|
|
}, {
|
|
/* RNDIS for tethering */
|
|
USB_INTERFACE_INFO(USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
|
|
.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,
|
|
};
|
|
|
|
static int __init rndis_init(void)
|
|
{
|
|
return usb_register(&rndis_driver);
|
|
}
|
|
module_init(rndis_init);
|
|
|
|
static void __exit rndis_exit(void)
|
|
{
|
|
usb_deregister(&rndis_driver);
|
|
}
|
|
module_exit(rndis_exit);
|
|
|
|
MODULE_AUTHOR("David Brownell");
|
|
MODULE_DESCRIPTION("USB Host side RNDIS driver");
|
|
MODULE_LICENSE("GPL");
|