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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Host Side support for RNDIS Networking Links
0004  * Copyright (C) 2005 by David Brownell
0005  */
0006 #include <linux/module.h>
0007 #include <linux/netdevice.h>
0008 #include <linux/etherdevice.h>
0009 #include <linux/ethtool.h>
0010 #include <linux/workqueue.h>
0011 #include <linux/slab.h>
0012 #include <linux/mii.h>
0013 #include <linux/usb.h>
0014 #include <linux/usb/cdc.h>
0015 #include <linux/usb/usbnet.h>
0016 #include <linux/usb/rndis_host.h>
0017 
0018 
0019 /*
0020  * RNDIS is NDIS remoted over USB.  It's a MSFT variant of CDC ACM ... of
0021  * course ACM was intended for modems, not Ethernet links!  USB's standard
0022  * for Ethernet links is "CDC Ethernet", which is significantly simpler.
0023  *
0024  * NOTE that Microsoft's "RNDIS 1.0" specification is incomplete.  Issues
0025  * include:
0026  *    - Power management in particular relies on information that's scattered
0027  *  through other documentation, and which is incomplete or incorrect even
0028  *  there.
0029  *    - There are various undocumented protocol requirements, such as the
0030  *  need to send unused garbage in control-OUT messages.
0031  *    - In some cases, MS-Windows will emit undocumented requests; this
0032  *  matters more to peripheral implementations than host ones.
0033  *
0034  * Moreover there's a no-open-specs variant of RNDIS called "ActiveSync".
0035  *
0036  * For these reasons and others, ** USE OF RNDIS IS STRONGLY DISCOURAGED ** in
0037  * favor of such non-proprietary alternatives as CDC Ethernet or the newer (and
0038  * currently rare) "Ethernet Emulation Model" (EEM).
0039  */
0040 
0041 /*
0042  * RNDIS notifications from device: command completion; "reverse"
0043  * keepalives; etc
0044  */
0045 void rndis_status(struct usbnet *dev, struct urb *urb)
0046 {
0047     netdev_dbg(dev->net, "rndis status urb, len %d stat %d\n",
0048            urb->actual_length, urb->status);
0049     // FIXME for keepalives, respond immediately (asynchronously)
0050     // if not an RNDIS status, do like cdc_status(dev,urb) does
0051 }
0052 EXPORT_SYMBOL_GPL(rndis_status);
0053 
0054 /*
0055  * RNDIS indicate messages.
0056  */
0057 static void rndis_msg_indicate(struct usbnet *dev, struct rndis_indicate *msg,
0058                 int buflen)
0059 {
0060     struct cdc_state *info = (void *)&dev->data;
0061     struct device *udev = &info->control->dev;
0062 
0063     if (dev->driver_info->indication) {
0064         dev->driver_info->indication(dev, msg, buflen);
0065     } else {
0066         u32 status = le32_to_cpu(msg->status);
0067 
0068         switch (status) {
0069         case RNDIS_STATUS_MEDIA_CONNECT:
0070             dev_info(udev, "rndis media connect\n");
0071             break;
0072         case RNDIS_STATUS_MEDIA_DISCONNECT:
0073             dev_info(udev, "rndis media disconnect\n");
0074             break;
0075         default:
0076             dev_info(udev, "rndis indication: 0x%08x\n", status);
0077         }
0078     }
0079 }
0080 
0081 /*
0082  * RPC done RNDIS-style.  Caller guarantees:
0083  * - message is properly byteswapped
0084  * - there's no other request pending
0085  * - buf can hold up to 1KB response (required by RNDIS spec)
0086  * On return, the first few entries are already byteswapped.
0087  *
0088  * Call context is likely probe(), before interface name is known,
0089  * which is why we won't try to use it in the diagnostics.
0090  */
0091 int rndis_command(struct usbnet *dev, struct rndis_msg_hdr *buf, int buflen)
0092 {
0093     struct cdc_state    *info = (void *) &dev->data;
0094     struct usb_cdc_notification notification;
0095     int         master_ifnum;
0096     int         retval;
0097     int         partial;
0098     unsigned        count;
0099     u32         xid = 0, msg_len, request_id, msg_type, rsp,
0100                 status;
0101 
0102     /* REVISIT when this gets called from contexts other than probe() or
0103      * disconnect(): either serialize, or dispatch responses on xid
0104      */
0105 
0106     msg_type = le32_to_cpu(buf->msg_type);
0107 
0108     /* Issue the request; xid is unique, don't bother byteswapping it */
0109     if (likely(msg_type != RNDIS_MSG_HALT && msg_type != RNDIS_MSG_RESET)) {
0110         xid = dev->xid++;
0111         if (!xid)
0112             xid = dev->xid++;
0113         buf->request_id = (__force __le32) xid;
0114     }
0115     master_ifnum = info->control->cur_altsetting->desc.bInterfaceNumber;
0116     retval = usb_control_msg(dev->udev,
0117         usb_sndctrlpipe(dev->udev, 0),
0118         USB_CDC_SEND_ENCAPSULATED_COMMAND,
0119         USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0120         0, master_ifnum,
0121         buf, le32_to_cpu(buf->msg_len),
0122         RNDIS_CONTROL_TIMEOUT_MS);
0123     if (unlikely(retval < 0 || xid == 0))
0124         return retval;
0125 
0126     /* Some devices don't respond on the control channel until
0127      * polled on the status channel, so do that first. */
0128     if (dev->driver_info->data & RNDIS_DRIVER_DATA_POLL_STATUS) {
0129         retval = usb_interrupt_msg(
0130             dev->udev,
0131             usb_rcvintpipe(dev->udev,
0132                        dev->status->desc.bEndpointAddress),
0133             &notification, sizeof(notification), &partial,
0134             RNDIS_CONTROL_TIMEOUT_MS);
0135         if (unlikely(retval < 0))
0136             return retval;
0137     }
0138 
0139     /* Poll the control channel; the request probably completed immediately */
0140     rsp = le32_to_cpu(buf->msg_type) | RNDIS_MSG_COMPLETION;
0141     for (count = 0; count < 10; count++) {
0142         memset(buf, 0, CONTROL_BUFFER_SIZE);
0143         retval = usb_control_msg(dev->udev,
0144             usb_rcvctrlpipe(dev->udev, 0),
0145             USB_CDC_GET_ENCAPSULATED_RESPONSE,
0146             USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0147             0, master_ifnum,
0148             buf, buflen,
0149             RNDIS_CONTROL_TIMEOUT_MS);
0150         if (likely(retval >= 8)) {
0151             msg_type = le32_to_cpu(buf->msg_type);
0152             msg_len = le32_to_cpu(buf->msg_len);
0153             status = le32_to_cpu(buf->status);
0154             request_id = (__force u32) buf->request_id;
0155             if (likely(msg_type == rsp)) {
0156                 if (likely(request_id == xid)) {
0157                     if (unlikely(rsp == RNDIS_MSG_RESET_C))
0158                         return 0;
0159                     if (likely(RNDIS_STATUS_SUCCESS ==
0160                             status))
0161                         return 0;
0162                     dev_dbg(&info->control->dev,
0163                         "rndis reply status %08x\n",
0164                         status);
0165                     return -EL3RST;
0166                 }
0167                 dev_dbg(&info->control->dev,
0168                     "rndis reply id %d expected %d\n",
0169                     request_id, xid);
0170                 /* then likely retry */
0171             } else switch (msg_type) {
0172             case RNDIS_MSG_INDICATE: /* fault/event */
0173                 rndis_msg_indicate(dev, (void *)buf, buflen);
0174                 break;
0175             case RNDIS_MSG_KEEPALIVE: { /* ping */
0176                 struct rndis_keepalive_c *msg = (void *)buf;
0177 
0178                 msg->msg_type = cpu_to_le32(RNDIS_MSG_KEEPALIVE_C);
0179                 msg->msg_len = cpu_to_le32(sizeof *msg);
0180                 msg->status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
0181                 retval = usb_control_msg(dev->udev,
0182                     usb_sndctrlpipe(dev->udev, 0),
0183                     USB_CDC_SEND_ENCAPSULATED_COMMAND,
0184                     USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0185                     0, master_ifnum,
0186                     msg, sizeof *msg,
0187                     RNDIS_CONTROL_TIMEOUT_MS);
0188                 if (unlikely(retval < 0))
0189                     dev_dbg(&info->control->dev,
0190                         "rndis keepalive err %d\n",
0191                         retval);
0192                 }
0193                 break;
0194             default:
0195                 dev_dbg(&info->control->dev,
0196                     "unexpected rndis msg %08x len %d\n",
0197                     le32_to_cpu(buf->msg_type), msg_len);
0198             }
0199         } else {
0200             /* device probably issued a protocol stall; ignore */
0201             dev_dbg(&info->control->dev,
0202                 "rndis response error, code %d\n", retval);
0203         }
0204         msleep(40);
0205     }
0206     dev_dbg(&info->control->dev, "rndis response timeout\n");
0207     return -ETIMEDOUT;
0208 }
0209 EXPORT_SYMBOL_GPL(rndis_command);
0210 
0211 /*
0212  * rndis_query:
0213  *
0214  * Performs a query for @oid along with 0 or more bytes of payload as
0215  * specified by @in_len. If @reply_len is not set to -1 then the reply
0216  * length is checked against this value, resulting in an error if it
0217  * doesn't match.
0218  *
0219  * NOTE: Adding a payload exactly or greater than the size of the expected
0220  * response payload is an evident requirement MSFT added for ActiveSync.
0221  *
0222  * The only exception is for OIDs that return a variably sized response,
0223  * in which case no payload should be added.  This undocumented (and
0224  * nonsensical!) issue was found by sniffing protocol requests from the
0225  * ActiveSync 4.1 Windows driver.
0226  */
0227 static int rndis_query(struct usbnet *dev, struct usb_interface *intf,
0228         void *buf, u32 oid, u32 in_len,
0229         void **reply, int *reply_len)
0230 {
0231     int retval;
0232     union {
0233         void            *buf;
0234         struct rndis_msg_hdr    *header;
0235         struct rndis_query  *get;
0236         struct rndis_query_c    *get_c;
0237     } u;
0238     u32 off, len;
0239 
0240     u.buf = buf;
0241 
0242     memset(u.get, 0, sizeof *u.get + in_len);
0243     u.get->msg_type = cpu_to_le32(RNDIS_MSG_QUERY);
0244     u.get->msg_len = cpu_to_le32(sizeof *u.get + in_len);
0245     u.get->oid = cpu_to_le32(oid);
0246     u.get->len = cpu_to_le32(in_len);
0247     u.get->offset = cpu_to_le32(20);
0248 
0249     retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
0250     if (unlikely(retval < 0)) {
0251         dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) failed, %d\n",
0252                 oid, retval);
0253         return retval;
0254     }
0255 
0256     off = le32_to_cpu(u.get_c->offset);
0257     len = le32_to_cpu(u.get_c->len);
0258     if (unlikely((8 + off + len) > CONTROL_BUFFER_SIZE))
0259         goto response_error;
0260 
0261     if (*reply_len != -1 && len != *reply_len)
0262         goto response_error;
0263 
0264     *reply = (unsigned char *) &u.get_c->request_id + off;
0265     *reply_len = len;
0266 
0267     return retval;
0268 
0269 response_error:
0270     dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) "
0271             "invalid response - off %d len %d\n",
0272         oid, off, len);
0273     return -EDOM;
0274 }
0275 
0276 /* same as usbnet_netdev_ops but MTU change not allowed */
0277 static const struct net_device_ops rndis_netdev_ops = {
0278     .ndo_open       = usbnet_open,
0279     .ndo_stop       = usbnet_stop,
0280     .ndo_start_xmit     = usbnet_start_xmit,
0281     .ndo_tx_timeout     = usbnet_tx_timeout,
0282     .ndo_get_stats64    = dev_get_tstats64,
0283     .ndo_set_mac_address    = eth_mac_addr,
0284     .ndo_validate_addr  = eth_validate_addr,
0285 };
0286 
0287 int
0288 generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
0289 {
0290     int         retval;
0291     struct net_device   *net = dev->net;
0292     struct cdc_state    *info = (void *) &dev->data;
0293     union {
0294         void            *buf;
0295         struct rndis_msg_hdr    *header;
0296         struct rndis_init   *init;
0297         struct rndis_init_c *init_c;
0298         struct rndis_query  *get;
0299         struct rndis_query_c    *get_c;
0300         struct rndis_set    *set;
0301         struct rndis_set_c  *set_c;
0302         struct rndis_halt   *halt;
0303     } u;
0304     u32         tmp;
0305     __le32          phym_unspec, *phym;
0306     int         reply_len;
0307     unsigned char       *bp;
0308 
0309     /* we can't rely on i/o from stack working, or stack allocation */
0310     u.buf = kmalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
0311     if (!u.buf)
0312         return -ENOMEM;
0313     retval = usbnet_generic_cdc_bind(dev, intf);
0314     if (retval < 0)
0315         goto fail;
0316 
0317     u.init->msg_type = cpu_to_le32(RNDIS_MSG_INIT);
0318     u.init->msg_len = cpu_to_le32(sizeof *u.init);
0319     u.init->major_version = cpu_to_le32(1);
0320     u.init->minor_version = cpu_to_le32(0);
0321 
0322     /* max transfer (in spec) is 0x4000 at full speed, but for
0323      * TX we'll stick to one Ethernet packet plus RNDIS framing.
0324      * For RX we handle drivers that zero-pad to end-of-packet.
0325      * Don't let userspace change these settings.
0326      *
0327      * NOTE: there still seems to be weirdness here, as if we need
0328      * to do some more things to make sure WinCE targets accept this.
0329      * They default to jumbograms of 8KB or 16KB, which is absurd
0330      * for such low data rates and which is also more than Linux
0331      * can usually expect to allocate for SKB data...
0332      */
0333     net->hard_header_len += sizeof (struct rndis_data_hdr);
0334     dev->hard_mtu = net->mtu + net->hard_header_len;
0335 
0336     dev->maxpacket = usb_maxpacket(dev->udev, dev->out);
0337     if (dev->maxpacket == 0) {
0338         netif_dbg(dev, probe, dev->net,
0339               "dev->maxpacket can't be 0\n");
0340         retval = -EINVAL;
0341         goto fail_and_release;
0342     }
0343 
0344     dev->rx_urb_size = dev->hard_mtu + (dev->maxpacket + 1);
0345     dev->rx_urb_size &= ~(dev->maxpacket - 1);
0346     u.init->max_transfer_size = cpu_to_le32(dev->rx_urb_size);
0347 
0348     net->netdev_ops = &rndis_netdev_ops;
0349 
0350     retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
0351     if (unlikely(retval < 0)) {
0352         /* it might not even be an RNDIS device!! */
0353         dev_err(&intf->dev, "RNDIS init failed, %d\n", retval);
0354         goto fail_and_release;
0355     }
0356     tmp = le32_to_cpu(u.init_c->max_transfer_size);
0357     if (tmp < dev->hard_mtu) {
0358         if (tmp <= net->hard_header_len) {
0359             dev_err(&intf->dev,
0360                 "dev can't take %u byte packets (max %u)\n",
0361                 dev->hard_mtu, tmp);
0362             retval = -EINVAL;
0363             goto halt_fail_and_release;
0364         }
0365         dev_warn(&intf->dev,
0366              "dev can't take %u byte packets (max %u), "
0367              "adjusting MTU to %u\n",
0368              dev->hard_mtu, tmp, tmp - net->hard_header_len);
0369         dev->hard_mtu = tmp;
0370         net->mtu = dev->hard_mtu - net->hard_header_len;
0371     }
0372 
0373     /* REVISIT:  peripheral "alignment" request is ignored ... */
0374     dev_dbg(&intf->dev,
0375         "hard mtu %u (%u from dev), rx buflen %zu, align %d\n",
0376         dev->hard_mtu, tmp, dev->rx_urb_size,
0377         1 << le32_to_cpu(u.init_c->packet_alignment));
0378 
0379     /* module has some device initialization code needs to be done right
0380      * after RNDIS_INIT */
0381     if (dev->driver_info->early_init &&
0382             dev->driver_info->early_init(dev) != 0)
0383         goto halt_fail_and_release;
0384 
0385     /* Check physical medium */
0386     phym = NULL;
0387     reply_len = sizeof *phym;
0388     retval = rndis_query(dev, intf, u.buf,
0389                  RNDIS_OID_GEN_PHYSICAL_MEDIUM,
0390                  reply_len, (void **)&phym, &reply_len);
0391     if (retval != 0 || !phym) {
0392         /* OID is optional so don't fail here. */
0393         phym_unspec = cpu_to_le32(RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED);
0394         phym = &phym_unspec;
0395     }
0396     if ((flags & FLAG_RNDIS_PHYM_WIRELESS) &&
0397         le32_to_cpup(phym) != RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
0398         netif_dbg(dev, probe, dev->net,
0399               "driver requires wireless physical medium, but device is not\n");
0400         retval = -ENODEV;
0401         goto halt_fail_and_release;
0402     }
0403     if ((flags & FLAG_RNDIS_PHYM_NOT_WIRELESS) &&
0404         le32_to_cpup(phym) == RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
0405         netif_dbg(dev, probe, dev->net,
0406               "driver requires non-wireless physical medium, but device is wireless.\n");
0407         retval = -ENODEV;
0408         goto halt_fail_and_release;
0409     }
0410 
0411     /* Get designated host ethernet address */
0412     reply_len = ETH_ALEN;
0413     retval = rndis_query(dev, intf, u.buf,
0414                  RNDIS_OID_802_3_PERMANENT_ADDRESS,
0415                  48, (void **) &bp, &reply_len);
0416     if (unlikely(retval< 0)) {
0417         dev_err(&intf->dev, "rndis get ethaddr, %d\n", retval);
0418         goto halt_fail_and_release;
0419     }
0420 
0421     eth_hw_addr_set(net, bp);
0422 
0423     /* set a nonzero filter to enable data transfers */
0424     memset(u.set, 0, sizeof *u.set);
0425     u.set->msg_type = cpu_to_le32(RNDIS_MSG_SET);
0426     u.set->msg_len = cpu_to_le32(4 + sizeof *u.set);
0427     u.set->oid = cpu_to_le32(RNDIS_OID_GEN_CURRENT_PACKET_FILTER);
0428     u.set->len = cpu_to_le32(4);
0429     u.set->offset = cpu_to_le32((sizeof *u.set) - 8);
0430     *(__le32 *)(u.buf + sizeof *u.set) = cpu_to_le32(RNDIS_DEFAULT_FILTER);
0431 
0432     retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
0433     if (unlikely(retval < 0)) {
0434         dev_err(&intf->dev, "rndis set packet filter, %d\n", retval);
0435         goto halt_fail_and_release;
0436     }
0437 
0438     retval = 0;
0439 
0440     kfree(u.buf);
0441     return retval;
0442 
0443 halt_fail_and_release:
0444     memset(u.halt, 0, sizeof *u.halt);
0445     u.halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
0446     u.halt->msg_len = cpu_to_le32(sizeof *u.halt);
0447     (void) rndis_command(dev, (void *)u.halt, CONTROL_BUFFER_SIZE);
0448 fail_and_release:
0449     usb_set_intfdata(info->data, NULL);
0450     usb_driver_release_interface(driver_of(intf), info->data);
0451     info->data = NULL;
0452 fail:
0453     kfree(u.buf);
0454     return retval;
0455 }
0456 EXPORT_SYMBOL_GPL(generic_rndis_bind);
0457 
0458 static int rndis_bind(struct usbnet *dev, struct usb_interface *intf)
0459 {
0460     return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS);
0461 }
0462 
0463 static int zte_rndis_bind(struct usbnet *dev, struct usb_interface *intf)
0464 {
0465     int status = rndis_bind(dev, intf);
0466 
0467     if (!status && (dev->net->dev_addr[0] & 0x02))
0468         eth_hw_addr_random(dev->net);
0469 
0470     return status;
0471 }
0472 
0473 void rndis_unbind(struct usbnet *dev, struct usb_interface *intf)
0474 {
0475     struct rndis_halt   *halt;
0476 
0477     /* try to clear any rndis state/activity (no i/o from stack!) */
0478     halt = kzalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
0479     if (halt) {
0480         halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
0481         halt->msg_len = cpu_to_le32(sizeof *halt);
0482         (void) rndis_command(dev, (void *)halt, CONTROL_BUFFER_SIZE);
0483         kfree(halt);
0484     }
0485 
0486     usbnet_cdc_unbind(dev, intf);
0487 }
0488 EXPORT_SYMBOL_GPL(rndis_unbind);
0489 
0490 /*
0491  * DATA -- host must not write zlps
0492  */
0493 int rndis_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
0494 {
0495     bool dst_mac_fixup;
0496 
0497     /* This check is no longer done by usbnet */
0498     if (skb->len < dev->net->hard_header_len)
0499         return 0;
0500 
0501     dst_mac_fixup = !!(dev->driver_info->data & RNDIS_DRIVER_DATA_DST_MAC_FIXUP);
0502 
0503     /* peripheral may have batched packets to us... */
0504     while (likely(skb->len)) {
0505         struct rndis_data_hdr   *hdr = (void *)skb->data;
0506         struct sk_buff      *skb2;
0507         u32         msg_type, msg_len, data_offset, data_len;
0508 
0509         msg_type = le32_to_cpu(hdr->msg_type);
0510         msg_len = le32_to_cpu(hdr->msg_len);
0511         data_offset = le32_to_cpu(hdr->data_offset);
0512         data_len = le32_to_cpu(hdr->data_len);
0513 
0514         /* don't choke if we see oob, per-packet data, etc */
0515         if (unlikely(msg_type != RNDIS_MSG_PACKET || skb->len < msg_len
0516                 || (data_offset + data_len + 8) > msg_len)) {
0517             dev->net->stats.rx_frame_errors++;
0518             netdev_dbg(dev->net, "bad rndis message %d/%d/%d/%d, len %d\n",
0519                    le32_to_cpu(hdr->msg_type),
0520                    msg_len, data_offset, data_len, skb->len);
0521             return 0;
0522         }
0523         skb_pull(skb, 8 + data_offset);
0524 
0525         /* at most one packet left? */
0526         if (likely((data_len - skb->len) <= sizeof *hdr)) {
0527             skb_trim(skb, data_len);
0528             break;
0529         }
0530 
0531         /* try to return all the packets in the batch */
0532         skb2 = skb_clone(skb, GFP_ATOMIC);
0533         if (unlikely(!skb2))
0534             break;
0535         skb_pull(skb, msg_len - sizeof *hdr);
0536         skb_trim(skb2, data_len);
0537 
0538         if (unlikely(dst_mac_fixup))
0539             usbnet_cdc_zte_rx_fixup(dev, skb2);
0540 
0541         usbnet_skb_return(dev, skb2);
0542     }
0543 
0544     /* caller will usbnet_skb_return the remaining packet */
0545     if (unlikely(dst_mac_fixup))
0546         usbnet_cdc_zte_rx_fixup(dev, skb);
0547 
0548     return 1;
0549 }
0550 EXPORT_SYMBOL_GPL(rndis_rx_fixup);
0551 
0552 struct sk_buff *
0553 rndis_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
0554 {
0555     struct rndis_data_hdr   *hdr;
0556     struct sk_buff      *skb2;
0557     unsigned        len = skb->len;
0558 
0559     if (likely(!skb_cloned(skb))) {
0560         int room = skb_headroom(skb);
0561 
0562         /* enough head room as-is? */
0563         if (unlikely((sizeof *hdr) <= room))
0564             goto fill;
0565 
0566         /* enough room, but needs to be readjusted? */
0567         room += skb_tailroom(skb);
0568         if (likely((sizeof *hdr) <= room)) {
0569             skb->data = memmove(skb->head + sizeof *hdr,
0570                         skb->data, len);
0571             skb_set_tail_pointer(skb, len);
0572             goto fill;
0573         }
0574     }
0575 
0576     /* create a new skb, with the correct size (and tailpad) */
0577     skb2 = skb_copy_expand(skb, sizeof *hdr, 1, flags);
0578     dev_kfree_skb_any(skb);
0579     if (unlikely(!skb2))
0580         return skb2;
0581     skb = skb2;
0582 
0583     /* fill out the RNDIS header.  we won't bother trying to batch
0584      * packets; Linux minimizes wasted bandwidth through tx queues.
0585      */
0586 fill:
0587     hdr = __skb_push(skb, sizeof *hdr);
0588     memset(hdr, 0, sizeof *hdr);
0589     hdr->msg_type = cpu_to_le32(RNDIS_MSG_PACKET);
0590     hdr->msg_len = cpu_to_le32(skb->len);
0591     hdr->data_offset = cpu_to_le32(sizeof(*hdr) - 8);
0592     hdr->data_len = cpu_to_le32(len);
0593 
0594     /* FIXME make the last packet always be short ... */
0595     return skb;
0596 }
0597 EXPORT_SYMBOL_GPL(rndis_tx_fixup);
0598 
0599 
0600 static const struct driver_info rndis_info = {
0601     .description =  "RNDIS device",
0602     .flags =    FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
0603     .bind =     rndis_bind,
0604     .unbind =   rndis_unbind,
0605     .status =   rndis_status,
0606     .rx_fixup = rndis_rx_fixup,
0607     .tx_fixup = rndis_tx_fixup,
0608 };
0609 
0610 static const struct driver_info rndis_poll_status_info = {
0611     .description =  "RNDIS device (poll status before control)",
0612     .flags =    FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
0613     .data =     RNDIS_DRIVER_DATA_POLL_STATUS,
0614     .bind =     rndis_bind,
0615     .unbind =   rndis_unbind,
0616     .status =   rndis_status,
0617     .rx_fixup = rndis_rx_fixup,
0618     .tx_fixup = rndis_tx_fixup,
0619 };
0620 
0621 static const struct driver_info zte_rndis_info = {
0622     .description =  "ZTE RNDIS device",
0623     .flags =    FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
0624     .data =     RNDIS_DRIVER_DATA_DST_MAC_FIXUP,
0625     .bind =     zte_rndis_bind,
0626     .unbind =   rndis_unbind,
0627     .status =   rndis_status,
0628     .rx_fixup = rndis_rx_fixup,
0629     .tx_fixup = rndis_tx_fixup,
0630 };
0631 
0632 /*-------------------------------------------------------------------------*/
0633 
0634 static const struct usb_device_id   products [] = {
0635 {
0636     /* 2Wire HomePortal 1000SW */
0637     USB_DEVICE_AND_INTERFACE_INFO(0x1630, 0x0042,
0638                       USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
0639     .driver_info = (unsigned long) &rndis_poll_status_info,
0640 }, {
0641     /* Hytera Communications DMR radios' "Radio to PC Network" */
0642     USB_VENDOR_AND_INTERFACE_INFO(0x238b,
0643                       USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
0644     .driver_info = (unsigned long)&rndis_info,
0645 }, {
0646     /* ZTE WWAN modules */
0647     USB_VENDOR_AND_INTERFACE_INFO(0x19d2,
0648                       USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
0649     .driver_info = (unsigned long)&zte_rndis_info,
0650 }, {
0651     /* ZTE WWAN modules, ACM flavour */
0652     USB_VENDOR_AND_INTERFACE_INFO(0x19d2,
0653                       USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
0654     .driver_info = (unsigned long)&zte_rndis_info,
0655 }, {
0656     /* RNDIS is MSFT's un-official variant of CDC ACM */
0657     USB_INTERFACE_INFO(USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
0658     .driver_info = (unsigned long) &rndis_info,
0659 }, {
0660     /* "ActiveSync" is an undocumented variant of RNDIS, used in WM5 */
0661     USB_INTERFACE_INFO(USB_CLASS_MISC, 1, 1),
0662     .driver_info = (unsigned long) &rndis_poll_status_info,
0663 }, {
0664     /* RNDIS for tethering */
0665     USB_INTERFACE_INFO(USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
0666     .driver_info = (unsigned long) &rndis_info,
0667 }, {
0668     /* Novatel Verizon USB730L */
0669     USB_INTERFACE_INFO(USB_CLASS_MISC, 4, 1),
0670     .driver_info = (unsigned long) &rndis_info,
0671 },
0672     { },        // END
0673 };
0674 MODULE_DEVICE_TABLE(usb, products);
0675 
0676 static struct usb_driver rndis_driver = {
0677     .name =     "rndis_host",
0678     .id_table = products,
0679     .probe =    usbnet_probe,
0680     .disconnect =   usbnet_disconnect,
0681     .suspend =  usbnet_suspend,
0682     .resume =   usbnet_resume,
0683     .disable_hub_initiated_lpm = 1,
0684 };
0685 
0686 module_usb_driver(rndis_driver);
0687 
0688 MODULE_AUTHOR("David Brownell");
0689 MODULE_DESCRIPTION("USB Host side RNDIS driver");
0690 MODULE_LICENSE("GPL");
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