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1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
64e04910 DB |
2 | /* |
3 | * Host Side support for RNDIS Networking Links | |
4 | * Copyright (C) 2005 by David Brownell | |
64e04910 | 5 | */ |
64e04910 | 6 | #include <linux/module.h> |
64e04910 DB |
7 | #include <linux/netdevice.h> |
8 | #include <linux/etherdevice.h> | |
9 | #include <linux/ethtool.h> | |
10 | #include <linux/workqueue.h> | |
5a0e3ad6 | 11 | #include <linux/slab.h> |
64e04910 DB |
12 | #include <linux/mii.h> |
13 | #include <linux/usb.h> | |
a8c28f23 | 14 | #include <linux/usb/cdc.h> |
3692e94f JK |
15 | #include <linux/usb/usbnet.h> |
16 | #include <linux/usb/rndis_host.h> | |
64e04910 DB |
17 | |
18 | ||
19 | /* | |
20 | * RNDIS is NDIS remoted over USB. It's a MSFT variant of CDC ACM ... of | |
21 | * course ACM was intended for modems, not Ethernet links! USB's standard | |
22 | * for Ethernet links is "CDC Ethernet", which is significantly simpler. | |
51400f1d DB |
23 | * |
24 | * NOTE that Microsoft's "RNDIS 1.0" specification is incomplete. Issues | |
25 | * include: | |
26 | * - Power management in particular relies on information that's scattered | |
27 | * through other documentation, and which is incomplete or incorrect even | |
28 | * there. | |
29 | * - There are various undocumented protocol requirements, such as the | |
30 | * need to send unused garbage in control-OUT messages. | |
31 | * - In some cases, MS-Windows will emit undocumented requests; this | |
32 | * matters more to peripheral implementations than host ones. | |
33 | * | |
ad55d71a OAVR |
34 | * Moreover there's a no-open-specs variant of RNDIS called "ActiveSync". |
35 | * | |
51400f1d DB |
36 | * For these reasons and others, ** USE OF RNDIS IS STRONGLY DISCOURAGED ** in |
37 | * favor of such non-proprietary alternatives as CDC Ethernet or the newer (and | |
38 | * currently rare) "Ethernet Emulation Model" (EEM). | |
64e04910 DB |
39 | */ |
40 | ||
64e04910 DB |
41 | /* |
42 | * RNDIS notifications from device: command completion; "reverse" | |
43 | * keepalives; etc | |
44 | */ | |
5665998c | 45 | void rndis_status(struct usbnet *dev, struct urb *urb) |
64e04910 | 46 | { |
60b86755 JP |
47 | netdev_dbg(dev->net, "rndis status urb, len %d stat %d\n", |
48 | urb->actual_length, urb->status); | |
64e04910 DB |
49 | // FIXME for keepalives, respond immediately (asynchronously) |
50 | // if not an RNDIS status, do like cdc_status(dev,urb) does | |
51 | } | |
5665998c | 52 | EXPORT_SYMBOL_GPL(rndis_status); |
64e04910 | 53 | |
2a4901bc JK |
54 | /* |
55 | * RNDIS indicate messages. | |
56 | */ | |
57 | static void rndis_msg_indicate(struct usbnet *dev, struct rndis_indicate *msg, | |
58 | int buflen) | |
59 | { | |
60 | struct cdc_state *info = (void *)&dev->data; | |
61 | struct device *udev = &info->control->dev; | |
62 | ||
63 | if (dev->driver_info->indication) { | |
64 | dev->driver_info->indication(dev, msg, buflen); | |
65 | } else { | |
3eef3668 JK |
66 | u32 status = le32_to_cpu(msg->status); |
67 | ||
68 | switch (status) { | |
69 | case RNDIS_STATUS_MEDIA_CONNECT: | |
2a4901bc JK |
70 | dev_info(udev, "rndis media connect\n"); |
71 | break; | |
3eef3668 | 72 | case RNDIS_STATUS_MEDIA_DISCONNECT: |
2a4901bc JK |
73 | dev_info(udev, "rndis media disconnect\n"); |
74 | break; | |
75 | default: | |
3eef3668 | 76 | dev_info(udev, "rndis indication: 0x%08x\n", status); |
2a4901bc JK |
77 | } |
78 | } | |
79 | } | |
80 | ||
64e04910 DB |
81 | /* |
82 | * RPC done RNDIS-style. Caller guarantees: | |
83 | * - message is properly byteswapped | |
84 | * - there's no other request pending | |
85 | * - buf can hold up to 1KB response (required by RNDIS spec) | |
86 | * On return, the first few entries are already byteswapped. | |
87 | * | |
88 | * Call context is likely probe(), before interface name is known, | |
89 | * which is why we won't try to use it in the diagnostics. | |
90 | */ | |
818727ba | 91 | int rndis_command(struct usbnet *dev, struct rndis_msg_hdr *buf, int buflen) |
64e04910 DB |
92 | { |
93 | struct cdc_state *info = (void *) &dev->data; | |
4d42d417 | 94 | struct usb_cdc_notification notification; |
ad55d71a | 95 | int master_ifnum; |
64e04910 | 96 | int retval; |
4d42d417 | 97 | int partial; |
64e04910 | 98 | unsigned count; |
3eef3668 JK |
99 | u32 xid = 0, msg_len, request_id, msg_type, rsp, |
100 | status; | |
64e04910 DB |
101 | |
102 | /* REVISIT when this gets called from contexts other than probe() or | |
103 | * disconnect(): either serialize, or dispatch responses on xid | |
104 | */ | |
105 | ||
3eef3668 JK |
106 | msg_type = le32_to_cpu(buf->msg_type); |
107 | ||
ad55d71a | 108 | /* Issue the request; xid is unique, don't bother byteswapping it */ |
3eef3668 | 109 | if (likely(msg_type != RNDIS_MSG_HALT && msg_type != RNDIS_MSG_RESET)) { |
64e04910 DB |
110 | xid = dev->xid++; |
111 | if (!xid) | |
112 | xid = dev->xid++; | |
113 | buf->request_id = (__force __le32) xid; | |
114 | } | |
ad55d71a | 115 | master_ifnum = info->control->cur_altsetting->desc.bInterfaceNumber; |
64e04910 DB |
116 | retval = usb_control_msg(dev->udev, |
117 | usb_sndctrlpipe(dev->udev, 0), | |
118 | USB_CDC_SEND_ENCAPSULATED_COMMAND, | |
119 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
ad55d71a | 120 | 0, master_ifnum, |
64e04910 DB |
121 | buf, le32_to_cpu(buf->msg_len), |
122 | RNDIS_CONTROL_TIMEOUT_MS); | |
123 | if (unlikely(retval < 0 || xid == 0)) | |
124 | return retval; | |
125 | ||
4d42d417 BH |
126 | /* Some devices don't respond on the control channel until |
127 | * polled on the status channel, so do that first. */ | |
128 | if (dev->driver_info->data & RNDIS_DRIVER_DATA_POLL_STATUS) { | |
129 | retval = usb_interrupt_msg( | |
130 | dev->udev, | |
131 | usb_rcvintpipe(dev->udev, | |
132 | dev->status->desc.bEndpointAddress), | |
133 | ¬ification, sizeof(notification), &partial, | |
134 | RNDIS_CONTROL_TIMEOUT_MS); | |
135 | if (unlikely(retval < 0)) | |
136 | return retval; | |
137 | } | |
64e04910 | 138 | |
4d42d417 | 139 | /* Poll the control channel; the request probably completed immediately */ |
3eef3668 | 140 | rsp = le32_to_cpu(buf->msg_type) | RNDIS_MSG_COMPLETION; |
64e04910 | 141 | for (count = 0; count < 10; count++) { |
ad55d71a | 142 | memset(buf, 0, CONTROL_BUFFER_SIZE); |
64e04910 DB |
143 | retval = usb_control_msg(dev->udev, |
144 | usb_rcvctrlpipe(dev->udev, 0), | |
145 | USB_CDC_GET_ENCAPSULATED_RESPONSE, | |
146 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
ad55d71a | 147 | 0, master_ifnum, |
818727ba | 148 | buf, buflen, |
64e04910 DB |
149 | RNDIS_CONTROL_TIMEOUT_MS); |
150 | if (likely(retval >= 8)) { | |
3eef3668 | 151 | msg_type = le32_to_cpu(buf->msg_type); |
64e04910 | 152 | msg_len = le32_to_cpu(buf->msg_len); |
3eef3668 | 153 | status = le32_to_cpu(buf->status); |
64e04910 | 154 | request_id = (__force u32) buf->request_id; |
3eef3668 | 155 | if (likely(msg_type == rsp)) { |
64e04910 | 156 | if (likely(request_id == xid)) { |
3eef3668 | 157 | if (unlikely(rsp == RNDIS_MSG_RESET_C)) |
64e04910 | 158 | return 0; |
3eef3668 JK |
159 | if (likely(RNDIS_STATUS_SUCCESS == |
160 | status)) | |
64e04910 DB |
161 | return 0; |
162 | dev_dbg(&info->control->dev, | |
163 | "rndis reply status %08x\n", | |
3eef3668 | 164 | status); |
64e04910 DB |
165 | return -EL3RST; |
166 | } | |
167 | dev_dbg(&info->control->dev, | |
168 | "rndis reply id %d expected %d\n", | |
169 | request_id, xid); | |
170 | /* then likely retry */ | |
3eef3668 JK |
171 | } else switch (msg_type) { |
172 | case RNDIS_MSG_INDICATE: /* fault/event */ | |
2a4901bc | 173 | rndis_msg_indicate(dev, (void *)buf, buflen); |
64e04910 | 174 | break; |
3eef3668 | 175 | case RNDIS_MSG_KEEPALIVE: { /* ping */ |
64e04910 DB |
176 | struct rndis_keepalive_c *msg = (void *)buf; |
177 | ||
7390e8b0 | 178 | msg->msg_type = cpu_to_le32(RNDIS_MSG_KEEPALIVE_C); |
35c26c2c | 179 | msg->msg_len = cpu_to_le32(sizeof *msg); |
7390e8b0 | 180 | msg->status = cpu_to_le32(RNDIS_STATUS_SUCCESS); |
64e04910 DB |
181 | retval = usb_control_msg(dev->udev, |
182 | usb_sndctrlpipe(dev->udev, 0), | |
183 | USB_CDC_SEND_ENCAPSULATED_COMMAND, | |
184 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
ad55d71a | 185 | 0, master_ifnum, |
64e04910 DB |
186 | msg, sizeof *msg, |
187 | RNDIS_CONTROL_TIMEOUT_MS); | |
188 | if (unlikely(retval < 0)) | |
189 | dev_dbg(&info->control->dev, | |
190 | "rndis keepalive err %d\n", | |
191 | retval); | |
192 | } | |
193 | break; | |
194 | default: | |
195 | dev_dbg(&info->control->dev, | |
196 | "unexpected rndis msg %08x len %d\n", | |
197 | le32_to_cpu(buf->msg_type), msg_len); | |
198 | } | |
199 | } else { | |
200 | /* device probably issued a protocol stall; ignore */ | |
201 | dev_dbg(&info->control->dev, | |
202 | "rndis response error, code %d\n", retval); | |
203 | } | |
4202c9fd | 204 | msleep(40); |
64e04910 DB |
205 | } |
206 | dev_dbg(&info->control->dev, "rndis response timeout\n"); | |
207 | return -ETIMEDOUT; | |
208 | } | |
5665998c | 209 | EXPORT_SYMBOL_GPL(rndis_command); |
64e04910 | 210 | |
ddda0862 DB |
211 | /* |
212 | * rndis_query: | |
213 | * | |
214 | * Performs a query for @oid along with 0 or more bytes of payload as | |
215 | * specified by @in_len. If @reply_len is not set to -1 then the reply | |
216 | * length is checked against this value, resulting in an error if it | |
217 | * doesn't match. | |
218 | * | |
219 | * NOTE: Adding a payload exactly or greater than the size of the expected | |
220 | * response payload is an evident requirement MSFT added for ActiveSync. | |
221 | * | |
222 | * The only exception is for OIDs that return a variably sized response, | |
223 | * in which case no payload should be added. This undocumented (and | |
224 | * nonsensical!) issue was found by sniffing protocol requests from the | |
225 | * ActiveSync 4.1 Windows driver. | |
226 | */ | |
227 | static int rndis_query(struct usbnet *dev, struct usb_interface *intf, | |
5432bdc0 | 228 | void *buf, u32 oid, u32 in_len, |
ddda0862 DB |
229 | void **reply, int *reply_len) |
230 | { | |
231 | int retval; | |
232 | union { | |
233 | void *buf; | |
234 | struct rndis_msg_hdr *header; | |
235 | struct rndis_query *get; | |
236 | struct rndis_query_c *get_c; | |
237 | } u; | |
238 | u32 off, len; | |
239 | ||
240 | u.buf = buf; | |
241 | ||
242 | memset(u.get, 0, sizeof *u.get + in_len); | |
7390e8b0 | 243 | u.get->msg_type = cpu_to_le32(RNDIS_MSG_QUERY); |
ddda0862 | 244 | u.get->msg_len = cpu_to_le32(sizeof *u.get + in_len); |
5432bdc0 | 245 | u.get->oid = cpu_to_le32(oid); |
ddda0862 | 246 | u.get->len = cpu_to_le32(in_len); |
35c26c2c | 247 | u.get->offset = cpu_to_le32(20); |
ddda0862 | 248 | |
818727ba | 249 | retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE); |
ddda0862 DB |
250 | if (unlikely(retval < 0)) { |
251 | dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) failed, %d\n", | |
252 | oid, retval); | |
253 | return retval; | |
254 | } | |
255 | ||
256 | off = le32_to_cpu(u.get_c->offset); | |
257 | len = le32_to_cpu(u.get_c->len); | |
258 | if (unlikely((8 + off + len) > CONTROL_BUFFER_SIZE)) | |
259 | goto response_error; | |
260 | ||
261 | if (*reply_len != -1 && len != *reply_len) | |
262 | goto response_error; | |
263 | ||
264 | *reply = (unsigned char *) &u.get_c->request_id + off; | |
265 | *reply_len = len; | |
266 | ||
267 | return retval; | |
268 | ||
269 | response_error: | |
270 | dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) " | |
271 | "invalid response - off %d len %d\n", | |
272 | oid, off, len); | |
273 | return -EDOM; | |
274 | } | |
275 | ||
0f2166df SH |
276 | /* same as usbnet_netdev_ops but MTU change not allowed */ |
277 | static const struct net_device_ops rndis_netdev_ops = { | |
278 | .ndo_open = usbnet_open, | |
279 | .ndo_stop = usbnet_stop, | |
280 | .ndo_start_xmit = usbnet_start_xmit, | |
281 | .ndo_tx_timeout = usbnet_tx_timeout, | |
c8b5d129 | 282 | .ndo_get_stats64 = usbnet_get_stats64, |
0f2166df SH |
283 | .ndo_set_mac_address = eth_mac_addr, |
284 | .ndo_validate_addr = eth_validate_addr, | |
285 | }; | |
286 | ||
039ee17d JK |
287 | int |
288 | generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags) | |
64e04910 DB |
289 | { |
290 | int retval; | |
291 | struct net_device *net = dev->net; | |
deb31f17 | 292 | struct cdc_state *info = (void *) &dev->data; |
64e04910 DB |
293 | union { |
294 | void *buf; | |
295 | struct rndis_msg_hdr *header; | |
296 | struct rndis_init *init; | |
297 | struct rndis_init_c *init_c; | |
298 | struct rndis_query *get; | |
299 | struct rndis_query_c *get_c; | |
300 | struct rndis_set *set; | |
301 | struct rndis_set_c *set_c; | |
9ff55874 | 302 | struct rndis_halt *halt; |
64e04910 | 303 | } u; |
d63ddcec AV |
304 | u32 tmp; |
305 | __le32 phym_unspec, *phym; | |
ddda0862 DB |
306 | int reply_len; |
307 | unsigned char *bp; | |
64e04910 DB |
308 | |
309 | /* we can't rely on i/o from stack working, or stack allocation */ | |
ad55d71a | 310 | u.buf = kmalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL); |
64e04910 DB |
311 | if (!u.buf) |
312 | return -ENOMEM; | |
313 | retval = usbnet_generic_cdc_bind(dev, intf); | |
314 | if (retval < 0) | |
deb31f17 | 315 | goto fail; |
64e04910 | 316 | |
7390e8b0 | 317 | u.init->msg_type = cpu_to_le32(RNDIS_MSG_INIT); |
35c26c2c HH |
318 | u.init->msg_len = cpu_to_le32(sizeof *u.init); |
319 | u.init->major_version = cpu_to_le32(1); | |
320 | u.init->minor_version = cpu_to_le32(0); | |
64e04910 | 321 | |
ad55d71a OAVR |
322 | /* max transfer (in spec) is 0x4000 at full speed, but for |
323 | * TX we'll stick to one Ethernet packet plus RNDIS framing. | |
324 | * For RX we handle drivers that zero-pad to end-of-packet. | |
325 | * Don't let userspace change these settings. | |
ddda0862 DB |
326 | * |
327 | * NOTE: there still seems to be wierdness here, as if we need | |
328 | * to do some more things to make sure WinCE targets accept this. | |
329 | * They default to jumbograms of 8KB or 16KB, which is absurd | |
330 | * for such low data rates and which is also more than Linux | |
331 | * can usually expect to allocate for SKB data... | |
ad55d71a OAVR |
332 | */ |
333 | net->hard_header_len += sizeof (struct rndis_data_hdr); | |
334 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
335 | ||
10d0f27c JCD |
336 | dev->maxpacket = usb_maxpacket(dev->udev, dev->out, 1); |
337 | if (dev->maxpacket == 0) { | |
a475f603 JP |
338 | netif_dbg(dev, probe, dev->net, |
339 | "dev->maxpacket can't be 0\n"); | |
10d0f27c JCD |
340 | retval = -EINVAL; |
341 | goto fail_and_release; | |
342 | } | |
343 | ||
ad55d71a OAVR |
344 | dev->rx_urb_size = dev->hard_mtu + (dev->maxpacket + 1); |
345 | dev->rx_urb_size &= ~(dev->maxpacket - 1); | |
346 | u.init->max_transfer_size = cpu_to_le32(dev->rx_urb_size); | |
347 | ||
0f2166df SH |
348 | net->netdev_ops = &rndis_netdev_ops; |
349 | ||
818727ba | 350 | retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE); |
64e04910 DB |
351 | if (unlikely(retval < 0)) { |
352 | /* it might not even be an RNDIS device!! */ | |
353 | dev_err(&intf->dev, "RNDIS init failed, %d\n", retval); | |
ddda0862 | 354 | goto fail_and_release; |
ad55d71a OAVR |
355 | } |
356 | tmp = le32_to_cpu(u.init_c->max_transfer_size); | |
357 | if (tmp < dev->hard_mtu) { | |
500d2c2f TS |
358 | if (tmp <= net->hard_header_len) { |
359 | dev_err(&intf->dev, | |
360 | "dev can't take %u byte packets (max %u)\n", | |
361 | dev->hard_mtu, tmp); | |
362 | retval = -EINVAL; | |
9ff55874 | 363 | goto halt_fail_and_release; |
500d2c2f | 364 | } |
500d2c2f TS |
365 | dev_warn(&intf->dev, |
366 | "dev can't take %u byte packets (max %u), " | |
367 | "adjusting MTU to %u\n", | |
40ac7b62 GN |
368 | dev->hard_mtu, tmp, tmp - net->hard_header_len); |
369 | dev->hard_mtu = tmp; | |
370 | net->mtu = dev->hard_mtu - net->hard_header_len; | |
64e04910 | 371 | } |
ad55d71a | 372 | |
64e04910 | 373 | /* REVISIT: peripheral "alignment" request is ignored ... */ |
ad55d71a | 374 | dev_dbg(&intf->dev, |
5b5e0928 | 375 | "hard mtu %u (%u from dev), rx buflen %zu, align %d\n", |
ad55d71a | 376 | dev->hard_mtu, tmp, dev->rx_urb_size, |
64e04910 DB |
377 | 1 << le32_to_cpu(u.init_c->packet_alignment)); |
378 | ||
7c39e038 JK |
379 | /* module has some device initialization code needs to be done right |
380 | * after RNDIS_INIT */ | |
381 | if (dev->driver_info->early_init && | |
382 | dev->driver_info->early_init(dev) != 0) | |
383 | goto halt_fail_and_release; | |
384 | ||
039ee17d | 385 | /* Check physical medium */ |
9f5e60dd | 386 | phym = NULL; |
039ee17d | 387 | reply_len = sizeof *phym; |
7390e8b0 | 388 | retval = rndis_query(dev, intf, u.buf, |
5432bdc0 JK |
389 | RNDIS_OID_GEN_PHYSICAL_MEDIUM, |
390 | 0, (void **) &phym, &reply_len); | |
9f5e60dd | 391 | if (retval != 0 || !phym) { |
039ee17d | 392 | /* OID is optional so don't fail here. */ |
7390e8b0 | 393 | phym_unspec = cpu_to_le32(RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED); |
9f5e60dd JK |
394 | phym = &phym_unspec; |
395 | } | |
039ee17d | 396 | if ((flags & FLAG_RNDIS_PHYM_WIRELESS) && |
3eef3668 | 397 | le32_to_cpup(phym) != RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) { |
a475f603 JP |
398 | netif_dbg(dev, probe, dev->net, |
399 | "driver requires wireless physical medium, but device is not\n"); | |
039ee17d JK |
400 | retval = -ENODEV; |
401 | goto halt_fail_and_release; | |
402 | } | |
403 | if ((flags & FLAG_RNDIS_PHYM_NOT_WIRELESS) && | |
3eef3668 | 404 | le32_to_cpup(phym) == RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) { |
a475f603 JP |
405 | netif_dbg(dev, probe, dev->net, |
406 | "driver requires non-wireless physical medium, but device is wireless.\n"); | |
039ee17d JK |
407 | retval = -ENODEV; |
408 | goto halt_fail_and_release; | |
409 | } | |
410 | ||
ddda0862 DB |
411 | /* Get designated host ethernet address */ |
412 | reply_len = ETH_ALEN; | |
7390e8b0 | 413 | retval = rndis_query(dev, intf, u.buf, |
5432bdc0 JK |
414 | RNDIS_OID_802_3_PERMANENT_ADDRESS, |
415 | 48, (void **) &bp, &reply_len); | |
ddda0862 | 416 | if (unlikely(retval< 0)) { |
64e04910 | 417 | dev_err(&intf->dev, "rndis get ethaddr, %d\n", retval); |
9ff55874 | 418 | goto halt_fail_and_release; |
64e04910 | 419 | } |
a5a18bdf KE |
420 | |
421 | if (bp[0] & 0x02) | |
422 | eth_hw_addr_random(net); | |
423 | else | |
424 | ether_addr_copy(net->dev_addr, bp); | |
64e04910 DB |
425 | |
426 | /* set a nonzero filter to enable data transfers */ | |
427 | memset(u.set, 0, sizeof *u.set); | |
7390e8b0 | 428 | u.set->msg_type = cpu_to_le32(RNDIS_MSG_SET); |
35c26c2c | 429 | u.set->msg_len = cpu_to_le32(4 + sizeof *u.set); |
8cdddc3f | 430 | u.set->oid = cpu_to_le32(RNDIS_OID_GEN_CURRENT_PACKET_FILTER); |
35c26c2c HH |
431 | u.set->len = cpu_to_le32(4); |
432 | u.set->offset = cpu_to_le32((sizeof *u.set) - 8); | |
7390e8b0 | 433 | *(__le32 *)(u.buf + sizeof *u.set) = cpu_to_le32(RNDIS_DEFAULT_FILTER); |
64e04910 | 434 | |
818727ba | 435 | retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE); |
64e04910 DB |
436 | if (unlikely(retval < 0)) { |
437 | dev_err(&intf->dev, "rndis set packet filter, %d\n", retval); | |
9ff55874 | 438 | goto halt_fail_and_release; |
64e04910 DB |
439 | } |
440 | ||
441 | retval = 0; | |
deb31f17 DG |
442 | |
443 | kfree(u.buf); | |
444 | return retval; | |
445 | ||
9ff55874 JK |
446 | halt_fail_and_release: |
447 | memset(u.halt, 0, sizeof *u.halt); | |
7390e8b0 | 448 | u.halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT); |
35c26c2c | 449 | u.halt->msg_len = cpu_to_le32(sizeof *u.halt); |
818727ba | 450 | (void) rndis_command(dev, (void *)u.halt, CONTROL_BUFFER_SIZE); |
deb31f17 DG |
451 | fail_and_release: |
452 | usb_set_intfdata(info->data, NULL); | |
453 | usb_driver_release_interface(driver_of(intf), info->data); | |
ddda0862 | 454 | info->data = NULL; |
deb31f17 | 455 | fail: |
64e04910 DB |
456 | kfree(u.buf); |
457 | return retval; | |
458 | } | |
5665998c | 459 | EXPORT_SYMBOL_GPL(generic_rndis_bind); |
64e04910 | 460 | |
039ee17d JK |
461 | static int rndis_bind(struct usbnet *dev, struct usb_interface *intf) |
462 | { | |
463 | return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS); | |
464 | } | |
465 | ||
5665998c | 466 | void rndis_unbind(struct usbnet *dev, struct usb_interface *intf) |
64e04910 DB |
467 | { |
468 | struct rndis_halt *halt; | |
469 | ||
470 | /* try to clear any rndis state/activity (no i/o from stack!) */ | |
04c3c01a | 471 | halt = kzalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL); |
64e04910 | 472 | if (halt) { |
7390e8b0 | 473 | halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT); |
35c26c2c | 474 | halt->msg_len = cpu_to_le32(sizeof *halt); |
818727ba | 475 | (void) rndis_command(dev, (void *)halt, CONTROL_BUFFER_SIZE); |
64e04910 DB |
476 | kfree(halt); |
477 | } | |
478 | ||
2bfa2e1f | 479 | usbnet_cdc_unbind(dev, intf); |
64e04910 | 480 | } |
5665998c | 481 | EXPORT_SYMBOL_GPL(rndis_unbind); |
64e04910 DB |
482 | |
483 | /* | |
484 | * DATA -- host must not write zlps | |
485 | */ | |
5665998c | 486 | int rndis_rx_fixup(struct usbnet *dev, struct sk_buff *skb) |
64e04910 | 487 | { |
eb85569f EG |
488 | /* This check is no longer done by usbnet */ |
489 | if (skb->len < dev->net->hard_header_len) | |
490 | return 0; | |
491 | ||
64e04910 DB |
492 | /* peripheral may have batched packets to us... */ |
493 | while (likely(skb->len)) { | |
494 | struct rndis_data_hdr *hdr = (void *)skb->data; | |
495 | struct sk_buff *skb2; | |
3eef3668 | 496 | u32 msg_type, msg_len, data_offset, data_len; |
64e04910 | 497 | |
3eef3668 | 498 | msg_type = le32_to_cpu(hdr->msg_type); |
64e04910 DB |
499 | msg_len = le32_to_cpu(hdr->msg_len); |
500 | data_offset = le32_to_cpu(hdr->data_offset); | |
501 | data_len = le32_to_cpu(hdr->data_len); | |
502 | ||
503 | /* don't choke if we see oob, per-packet data, etc */ | |
3eef3668 JK |
504 | if (unlikely(msg_type != RNDIS_MSG_PACKET || skb->len < msg_len |
505 | || (data_offset + data_len + 8) > msg_len)) { | |
58e2e7d5 | 506 | dev->net->stats.rx_frame_errors++; |
60b86755 JP |
507 | netdev_dbg(dev->net, "bad rndis message %d/%d/%d/%d, len %d\n", |
508 | le32_to_cpu(hdr->msg_type), | |
509 | msg_len, data_offset, data_len, skb->len); | |
64e04910 DB |
510 | return 0; |
511 | } | |
512 | skb_pull(skb, 8 + data_offset); | |
513 | ||
514 | /* at most one packet left? */ | |
515 | if (likely((data_len - skb->len) <= sizeof *hdr)) { | |
516 | skb_trim(skb, data_len); | |
517 | break; | |
518 | } | |
519 | ||
520 | /* try to return all the packets in the batch */ | |
521 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
522 | if (unlikely(!skb2)) | |
523 | break; | |
524 | skb_pull(skb, msg_len - sizeof *hdr); | |
525 | skb_trim(skb2, data_len); | |
526 | usbnet_skb_return(dev, skb2); | |
527 | } | |
528 | ||
529 | /* caller will usbnet_skb_return the remaining packet */ | |
530 | return 1; | |
531 | } | |
5665998c | 532 | EXPORT_SYMBOL_GPL(rndis_rx_fixup); |
64e04910 | 533 | |
5665998c | 534 | struct sk_buff * |
55016f10 | 535 | rndis_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) |
64e04910 DB |
536 | { |
537 | struct rndis_data_hdr *hdr; | |
538 | struct sk_buff *skb2; | |
539 | unsigned len = skb->len; | |
540 | ||
541 | if (likely(!skb_cloned(skb))) { | |
542 | int room = skb_headroom(skb); | |
543 | ||
544 | /* enough head room as-is? */ | |
545 | if (unlikely((sizeof *hdr) <= room)) | |
546 | goto fill; | |
547 | ||
548 | /* enough room, but needs to be readjusted? */ | |
549 | room += skb_tailroom(skb); | |
550 | if (likely((sizeof *hdr) <= room)) { | |
551 | skb->data = memmove(skb->head + sizeof *hdr, | |
552 | skb->data, len); | |
27a884dc | 553 | skb_set_tail_pointer(skb, len); |
64e04910 DB |
554 | goto fill; |
555 | } | |
556 | } | |
557 | ||
558 | /* create a new skb, with the correct size (and tailpad) */ | |
559 | skb2 = skb_copy_expand(skb, sizeof *hdr, 1, flags); | |
560 | dev_kfree_skb_any(skb); | |
561 | if (unlikely(!skb2)) | |
562 | return skb2; | |
563 | skb = skb2; | |
564 | ||
565 | /* fill out the RNDIS header. we won't bother trying to batch | |
566 | * packets; Linux minimizes wasted bandwidth through tx queues. | |
567 | */ | |
568 | fill: | |
d58ff351 | 569 | hdr = __skb_push(skb, sizeof *hdr); |
64e04910 | 570 | memset(hdr, 0, sizeof *hdr); |
7390e8b0 | 571 | hdr->msg_type = cpu_to_le32(RNDIS_MSG_PACKET); |
64e04910 | 572 | hdr->msg_len = cpu_to_le32(skb->len); |
35c26c2c | 573 | hdr->data_offset = cpu_to_le32(sizeof(*hdr) - 8); |
64e04910 DB |
574 | hdr->data_len = cpu_to_le32(len); |
575 | ||
576 | /* FIXME make the last packet always be short ... */ | |
577 | return skb; | |
578 | } | |
5665998c | 579 | EXPORT_SYMBOL_GPL(rndis_tx_fixup); |
64e04910 DB |
580 | |
581 | ||
582 | static const struct driver_info rndis_info = { | |
583 | .description = "RNDIS device", | |
c261344d | 584 | .flags = FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT, |
039ee17d | 585 | .bind = rndis_bind, |
64e04910 DB |
586 | .unbind = rndis_unbind, |
587 | .status = rndis_status, | |
588 | .rx_fixup = rndis_rx_fixup, | |
589 | .tx_fixup = rndis_tx_fixup, | |
590 | }; | |
591 | ||
4d42d417 BH |
592 | static const struct driver_info rndis_poll_status_info = { |
593 | .description = "RNDIS device (poll status before control)", | |
eb8aa72d | 594 | .flags = FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT, |
4d42d417 BH |
595 | .data = RNDIS_DRIVER_DATA_POLL_STATUS, |
596 | .bind = rndis_bind, | |
597 | .unbind = rndis_unbind, | |
598 | .status = rndis_status, | |
599 | .rx_fixup = rndis_rx_fixup, | |
600 | .tx_fixup = rndis_tx_fixup, | |
601 | }; | |
602 | ||
64e04910 DB |
603 | /*-------------------------------------------------------------------------*/ |
604 | ||
605 | static const struct usb_device_id products [] = { | |
606 | { | |
4d42d417 BH |
607 | /* 2Wire HomePortal 1000SW */ |
608 | USB_DEVICE_AND_INTERFACE_INFO(0x1630, 0x0042, | |
609 | USB_CLASS_COMM, 2 /* ACM */, 0x0ff), | |
610 | .driver_info = (unsigned long) &rndis_poll_status_info, | |
611 | }, { | |
64e04910 DB |
612 | /* RNDIS is MSFT's un-official variant of CDC ACM */ |
613 | USB_INTERFACE_INFO(USB_CLASS_COMM, 2 /* ACM */, 0x0ff), | |
614 | .driver_info = (unsigned long) &rndis_info, | |
ad55d71a OAVR |
615 | }, { |
616 | /* "ActiveSync" is an undocumented variant of RNDIS, used in WM5 */ | |
617 | USB_INTERFACE_INFO(USB_CLASS_MISC, 1, 1), | |
4d42d417 | 618 | .driver_info = (unsigned long) &rndis_poll_status_info, |
7e99eedd TB |
619 | }, { |
620 | /* RNDIS for tethering */ | |
621 | USB_INTERFACE_INFO(USB_CLASS_WIRELESS_CONTROLLER, 1, 3), | |
622 | .driver_info = (unsigned long) &rndis_info, | |
63ba395c AM |
623 | }, { |
624 | /* Novatel Verizon USB730L */ | |
625 | USB_INTERFACE_INFO(USB_CLASS_MISC, 4, 1), | |
626 | .driver_info = (unsigned long) &rndis_info, | |
64e04910 DB |
627 | }, |
628 | { }, // END | |
629 | }; | |
630 | MODULE_DEVICE_TABLE(usb, products); | |
631 | ||
632 | static struct usb_driver rndis_driver = { | |
64e04910 DB |
633 | .name = "rndis_host", |
634 | .id_table = products, | |
635 | .probe = usbnet_probe, | |
636 | .disconnect = usbnet_disconnect, | |
637 | .suspend = usbnet_suspend, | |
638 | .resume = usbnet_resume, | |
e1f12eb6 | 639 | .disable_hub_initiated_lpm = 1, |
64e04910 DB |
640 | }; |
641 | ||
d632eb1b | 642 | module_usb_driver(rndis_driver); |
64e04910 DB |
643 | |
644 | MODULE_AUTHOR("David Brownell"); | |
645 | MODULE_DESCRIPTION("USB Host side RNDIS driver"); | |
646 | MODULE_LICENSE("GPL"); |