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64e04910 DB |
1 | /* |
2 | * Host Side support for RNDIS Networking Links | |
3 | * Copyright (C) 2005 by David Brownell | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | // #define DEBUG // error path messages, extra info | |
21 | // #define VERBOSE // more; success messages | |
22 | ||
64e04910 | 23 | #include <linux/module.h> |
64e04910 DB |
24 | #include <linux/init.h> |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/ethtool.h> | |
28 | #include <linux/workqueue.h> | |
29 | #include <linux/mii.h> | |
30 | #include <linux/usb.h> | |
a8c28f23 | 31 | #include <linux/usb/cdc.h> |
3692e94f JK |
32 | #include <linux/usb/usbnet.h> |
33 | #include <linux/usb/rndis_host.h> | |
64e04910 DB |
34 | |
35 | ||
36 | /* | |
37 | * RNDIS is NDIS remoted over USB. It's a MSFT variant of CDC ACM ... of | |
38 | * course ACM was intended for modems, not Ethernet links! USB's standard | |
39 | * for Ethernet links is "CDC Ethernet", which is significantly simpler. | |
51400f1d DB |
40 | * |
41 | * NOTE that Microsoft's "RNDIS 1.0" specification is incomplete. Issues | |
42 | * include: | |
43 | * - Power management in particular relies on information that's scattered | |
44 | * through other documentation, and which is incomplete or incorrect even | |
45 | * there. | |
46 | * - There are various undocumented protocol requirements, such as the | |
47 | * need to send unused garbage in control-OUT messages. | |
48 | * - In some cases, MS-Windows will emit undocumented requests; this | |
49 | * matters more to peripheral implementations than host ones. | |
50 | * | |
ad55d71a OAVR |
51 | * Moreover there's a no-open-specs variant of RNDIS called "ActiveSync". |
52 | * | |
51400f1d DB |
53 | * For these reasons and others, ** USE OF RNDIS IS STRONGLY DISCOURAGED ** in |
54 | * favor of such non-proprietary alternatives as CDC Ethernet or the newer (and | |
55 | * currently rare) "Ethernet Emulation Model" (EEM). | |
64e04910 DB |
56 | */ |
57 | ||
64e04910 DB |
58 | /* |
59 | * RNDIS notifications from device: command completion; "reverse" | |
60 | * keepalives; etc | |
61 | */ | |
5665998c | 62 | void rndis_status(struct usbnet *dev, struct urb *urb) |
64e04910 DB |
63 | { |
64 | devdbg(dev, "rndis status urb, len %d stat %d", | |
65 | urb->actual_length, urb->status); | |
66 | // FIXME for keepalives, respond immediately (asynchronously) | |
67 | // if not an RNDIS status, do like cdc_status(dev,urb) does | |
68 | } | |
5665998c | 69 | EXPORT_SYMBOL_GPL(rndis_status); |
64e04910 DB |
70 | |
71 | /* | |
72 | * RPC done RNDIS-style. Caller guarantees: | |
73 | * - message is properly byteswapped | |
74 | * - there's no other request pending | |
75 | * - buf can hold up to 1KB response (required by RNDIS spec) | |
76 | * On return, the first few entries are already byteswapped. | |
77 | * | |
78 | * Call context is likely probe(), before interface name is known, | |
79 | * which is why we won't try to use it in the diagnostics. | |
80 | */ | |
5665998c | 81 | int rndis_command(struct usbnet *dev, struct rndis_msg_hdr *buf) |
64e04910 DB |
82 | { |
83 | struct cdc_state *info = (void *) &dev->data; | |
ad55d71a | 84 | int master_ifnum; |
64e04910 DB |
85 | int retval; |
86 | unsigned count; | |
87 | __le32 rsp; | |
88 | u32 xid = 0, msg_len, request_id; | |
89 | ||
90 | /* REVISIT when this gets called from contexts other than probe() or | |
91 | * disconnect(): either serialize, or dispatch responses on xid | |
92 | */ | |
93 | ||
ad55d71a | 94 | /* Issue the request; xid is unique, don't bother byteswapping it */ |
64e04910 DB |
95 | if (likely(buf->msg_type != RNDIS_MSG_HALT |
96 | && buf->msg_type != RNDIS_MSG_RESET)) { | |
97 | xid = dev->xid++; | |
98 | if (!xid) | |
99 | xid = dev->xid++; | |
100 | buf->request_id = (__force __le32) xid; | |
101 | } | |
ad55d71a | 102 | master_ifnum = info->control->cur_altsetting->desc.bInterfaceNumber; |
64e04910 DB |
103 | retval = usb_control_msg(dev->udev, |
104 | usb_sndctrlpipe(dev->udev, 0), | |
105 | USB_CDC_SEND_ENCAPSULATED_COMMAND, | |
106 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
ad55d71a | 107 | 0, master_ifnum, |
64e04910 DB |
108 | buf, le32_to_cpu(buf->msg_len), |
109 | RNDIS_CONTROL_TIMEOUT_MS); | |
110 | if (unlikely(retval < 0 || xid == 0)) | |
111 | return retval; | |
112 | ||
113 | // FIXME Seems like some devices discard responses when | |
114 | // we time out and cancel our "get response" requests... | |
115 | // so, this is fragile. Probably need to poll for status. | |
116 | ||
117 | /* ignore status endpoint, just poll the control channel; | |
118 | * the request probably completed immediately | |
119 | */ | |
120 | rsp = buf->msg_type | RNDIS_MSG_COMPLETION; | |
121 | for (count = 0; count < 10; count++) { | |
ad55d71a | 122 | memset(buf, 0, CONTROL_BUFFER_SIZE); |
64e04910 DB |
123 | retval = usb_control_msg(dev->udev, |
124 | usb_rcvctrlpipe(dev->udev, 0), | |
125 | USB_CDC_GET_ENCAPSULATED_RESPONSE, | |
126 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
ad55d71a OAVR |
127 | 0, master_ifnum, |
128 | buf, CONTROL_BUFFER_SIZE, | |
64e04910 DB |
129 | RNDIS_CONTROL_TIMEOUT_MS); |
130 | if (likely(retval >= 8)) { | |
131 | msg_len = le32_to_cpu(buf->msg_len); | |
132 | request_id = (__force u32) buf->request_id; | |
133 | if (likely(buf->msg_type == rsp)) { | |
134 | if (likely(request_id == xid)) { | |
135 | if (unlikely(rsp == RNDIS_MSG_RESET_C)) | |
136 | return 0; | |
137 | if (likely(RNDIS_STATUS_SUCCESS | |
138 | == buf->status)) | |
139 | return 0; | |
140 | dev_dbg(&info->control->dev, | |
141 | "rndis reply status %08x\n", | |
142 | le32_to_cpu(buf->status)); | |
143 | return -EL3RST; | |
144 | } | |
145 | dev_dbg(&info->control->dev, | |
146 | "rndis reply id %d expected %d\n", | |
147 | request_id, xid); | |
148 | /* then likely retry */ | |
149 | } else switch (buf->msg_type) { | |
5d6ecf6c JK |
150 | case RNDIS_MSG_INDICATE: { /* fault/event */ |
151 | struct rndis_indicate *msg = (void *)buf; | |
152 | int state = 0; | |
153 | ||
154 | switch (msg->status) { | |
155 | case RNDIS_STATUS_MEDIA_CONNECT: | |
156 | state = 1; | |
157 | case RNDIS_STATUS_MEDIA_DISCONNECT: | |
158 | dev_info(&info->control->dev, | |
159 | "rndis media %sconnect\n", | |
160 | !state?"dis":""); | |
161 | if (dev->driver_info->link_change) | |
162 | dev->driver_info->link_change( | |
163 | dev, state); | |
164 | break; | |
165 | default: | |
166 | dev_info(&info->control->dev, | |
167 | "rndis indication: 0x%08x\n", | |
168 | le32_to_cpu(msg->status)); | |
169 | } | |
64e04910 DB |
170 | } |
171 | break; | |
172 | case RNDIS_MSG_KEEPALIVE: { /* ping */ | |
173 | struct rndis_keepalive_c *msg = (void *)buf; | |
174 | ||
175 | msg->msg_type = RNDIS_MSG_KEEPALIVE_C; | |
176 | msg->msg_len = ccpu2(sizeof *msg); | |
177 | msg->status = RNDIS_STATUS_SUCCESS; | |
178 | retval = usb_control_msg(dev->udev, | |
179 | usb_sndctrlpipe(dev->udev, 0), | |
180 | USB_CDC_SEND_ENCAPSULATED_COMMAND, | |
181 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
ad55d71a | 182 | 0, master_ifnum, |
64e04910 DB |
183 | msg, sizeof *msg, |
184 | RNDIS_CONTROL_TIMEOUT_MS); | |
185 | if (unlikely(retval < 0)) | |
186 | dev_dbg(&info->control->dev, | |
187 | "rndis keepalive err %d\n", | |
188 | retval); | |
189 | } | |
190 | break; | |
191 | default: | |
192 | dev_dbg(&info->control->dev, | |
193 | "unexpected rndis msg %08x len %d\n", | |
194 | le32_to_cpu(buf->msg_type), msg_len); | |
195 | } | |
196 | } else { | |
197 | /* device probably issued a protocol stall; ignore */ | |
198 | dev_dbg(&info->control->dev, | |
199 | "rndis response error, code %d\n", retval); | |
200 | } | |
201 | msleep(2); | |
202 | } | |
203 | dev_dbg(&info->control->dev, "rndis response timeout\n"); | |
204 | return -ETIMEDOUT; | |
205 | } | |
5665998c | 206 | EXPORT_SYMBOL_GPL(rndis_command); |
64e04910 | 207 | |
ddda0862 DB |
208 | /* |
209 | * rndis_query: | |
210 | * | |
211 | * Performs a query for @oid along with 0 or more bytes of payload as | |
212 | * specified by @in_len. If @reply_len is not set to -1 then the reply | |
213 | * length is checked against this value, resulting in an error if it | |
214 | * doesn't match. | |
215 | * | |
216 | * NOTE: Adding a payload exactly or greater than the size of the expected | |
217 | * response payload is an evident requirement MSFT added for ActiveSync. | |
218 | * | |
219 | * The only exception is for OIDs that return a variably sized response, | |
220 | * in which case no payload should be added. This undocumented (and | |
221 | * nonsensical!) issue was found by sniffing protocol requests from the | |
222 | * ActiveSync 4.1 Windows driver. | |
223 | */ | |
224 | static int rndis_query(struct usbnet *dev, struct usb_interface *intf, | |
225 | void *buf, u32 oid, u32 in_len, | |
226 | void **reply, int *reply_len) | |
227 | { | |
228 | int retval; | |
229 | union { | |
230 | void *buf; | |
231 | struct rndis_msg_hdr *header; | |
232 | struct rndis_query *get; | |
233 | struct rndis_query_c *get_c; | |
234 | } u; | |
235 | u32 off, len; | |
236 | ||
237 | u.buf = buf; | |
238 | ||
239 | memset(u.get, 0, sizeof *u.get + in_len); | |
240 | u.get->msg_type = RNDIS_MSG_QUERY; | |
241 | u.get->msg_len = cpu_to_le32(sizeof *u.get + in_len); | |
242 | u.get->oid = oid; | |
243 | u.get->len = cpu_to_le32(in_len); | |
244 | u.get->offset = ccpu2(20); | |
245 | ||
246 | retval = rndis_command(dev, u.header); | |
247 | if (unlikely(retval < 0)) { | |
248 | dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) failed, %d\n", | |
249 | oid, retval); | |
250 | return retval; | |
251 | } | |
252 | ||
253 | off = le32_to_cpu(u.get_c->offset); | |
254 | len = le32_to_cpu(u.get_c->len); | |
255 | if (unlikely((8 + off + len) > CONTROL_BUFFER_SIZE)) | |
256 | goto response_error; | |
257 | ||
258 | if (*reply_len != -1 && len != *reply_len) | |
259 | goto response_error; | |
260 | ||
261 | *reply = (unsigned char *) &u.get_c->request_id + off; | |
262 | *reply_len = len; | |
263 | ||
264 | return retval; | |
265 | ||
266 | response_error: | |
267 | dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) " | |
268 | "invalid response - off %d len %d\n", | |
269 | oid, off, len); | |
270 | return -EDOM; | |
271 | } | |
272 | ||
039ee17d JK |
273 | int |
274 | generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags) | |
64e04910 DB |
275 | { |
276 | int retval; | |
277 | struct net_device *net = dev->net; | |
deb31f17 | 278 | struct cdc_state *info = (void *) &dev->data; |
64e04910 DB |
279 | union { |
280 | void *buf; | |
281 | struct rndis_msg_hdr *header; | |
282 | struct rndis_init *init; | |
283 | struct rndis_init_c *init_c; | |
284 | struct rndis_query *get; | |
285 | struct rndis_query_c *get_c; | |
286 | struct rndis_set *set; | |
287 | struct rndis_set_c *set_c; | |
9ff55874 | 288 | struct rndis_halt *halt; |
64e04910 | 289 | } u; |
039ee17d | 290 | u32 tmp, *phym; |
ddda0862 DB |
291 | int reply_len; |
292 | unsigned char *bp; | |
64e04910 DB |
293 | |
294 | /* we can't rely on i/o from stack working, or stack allocation */ | |
ad55d71a | 295 | u.buf = kmalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL); |
64e04910 DB |
296 | if (!u.buf) |
297 | return -ENOMEM; | |
298 | retval = usbnet_generic_cdc_bind(dev, intf); | |
299 | if (retval < 0) | |
deb31f17 | 300 | goto fail; |
64e04910 | 301 | |
64e04910 DB |
302 | u.init->msg_type = RNDIS_MSG_INIT; |
303 | u.init->msg_len = ccpu2(sizeof *u.init); | |
304 | u.init->major_version = ccpu2(1); | |
305 | u.init->minor_version = ccpu2(0); | |
64e04910 | 306 | |
ad55d71a OAVR |
307 | /* max transfer (in spec) is 0x4000 at full speed, but for |
308 | * TX we'll stick to one Ethernet packet plus RNDIS framing. | |
309 | * For RX we handle drivers that zero-pad to end-of-packet. | |
310 | * Don't let userspace change these settings. | |
ddda0862 DB |
311 | * |
312 | * NOTE: there still seems to be wierdness here, as if we need | |
313 | * to do some more things to make sure WinCE targets accept this. | |
314 | * They default to jumbograms of 8KB or 16KB, which is absurd | |
315 | * for such low data rates and which is also more than Linux | |
316 | * can usually expect to allocate for SKB data... | |
ad55d71a OAVR |
317 | */ |
318 | net->hard_header_len += sizeof (struct rndis_data_hdr); | |
319 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
320 | ||
321 | dev->rx_urb_size = dev->hard_mtu + (dev->maxpacket + 1); | |
322 | dev->rx_urb_size &= ~(dev->maxpacket - 1); | |
323 | u.init->max_transfer_size = cpu_to_le32(dev->rx_urb_size); | |
324 | ||
325 | net->change_mtu = NULL; | |
64e04910 DB |
326 | retval = rndis_command(dev, u.header); |
327 | if (unlikely(retval < 0)) { | |
328 | /* it might not even be an RNDIS device!! */ | |
329 | dev_err(&intf->dev, "RNDIS init failed, %d\n", retval); | |
ddda0862 | 330 | goto fail_and_release; |
ad55d71a OAVR |
331 | } |
332 | tmp = le32_to_cpu(u.init_c->max_transfer_size); | |
333 | if (tmp < dev->hard_mtu) { | |
500d2c2f TS |
334 | if (tmp <= net->hard_header_len) { |
335 | dev_err(&intf->dev, | |
336 | "dev can't take %u byte packets (max %u)\n", | |
337 | dev->hard_mtu, tmp); | |
338 | retval = -EINVAL; | |
9ff55874 | 339 | goto halt_fail_and_release; |
500d2c2f TS |
340 | } |
341 | dev->hard_mtu = tmp; | |
342 | net->mtu = dev->hard_mtu - net->hard_header_len; | |
343 | dev_warn(&intf->dev, | |
344 | "dev can't take %u byte packets (max %u), " | |
345 | "adjusting MTU to %u\n", | |
346 | dev->hard_mtu, tmp, net->mtu); | |
64e04910 | 347 | } |
ad55d71a | 348 | |
64e04910 | 349 | /* REVISIT: peripheral "alignment" request is ignored ... */ |
ad55d71a OAVR |
350 | dev_dbg(&intf->dev, |
351 | "hard mtu %u (%u from dev), rx buflen %Zu, align %d\n", | |
352 | dev->hard_mtu, tmp, dev->rx_urb_size, | |
64e04910 DB |
353 | 1 << le32_to_cpu(u.init_c->packet_alignment)); |
354 | ||
7c39e038 JK |
355 | /* module has some device initialization code needs to be done right |
356 | * after RNDIS_INIT */ | |
357 | if (dev->driver_info->early_init && | |
358 | dev->driver_info->early_init(dev) != 0) | |
359 | goto halt_fail_and_release; | |
360 | ||
039ee17d JK |
361 | /* Check physical medium */ |
362 | reply_len = sizeof *phym; | |
363 | retval = rndis_query(dev, intf, u.buf, OID_GEN_PHYSICAL_MEDIUM, | |
364 | 0, (void **) &phym, &reply_len); | |
365 | if (retval != 0) | |
366 | /* OID is optional so don't fail here. */ | |
367 | *phym = RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED; | |
368 | if ((flags & FLAG_RNDIS_PHYM_WIRELESS) && | |
369 | *phym != RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) { | |
370 | if (netif_msg_probe(dev)) | |
371 | dev_dbg(&intf->dev, "driver requires wireless " | |
372 | "physical medium, but device is not.\n"); | |
373 | retval = -ENODEV; | |
374 | goto halt_fail_and_release; | |
375 | } | |
376 | if ((flags & FLAG_RNDIS_PHYM_NOT_WIRELESS) && | |
377 | *phym == RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) { | |
378 | if (netif_msg_probe(dev)) | |
379 | dev_dbg(&intf->dev, "driver requires non-wireless " | |
380 | "physical medium, but device is wireless.\n"); | |
381 | retval = -ENODEV; | |
382 | goto halt_fail_and_release; | |
383 | } | |
384 | ||
ddda0862 DB |
385 | /* Get designated host ethernet address */ |
386 | reply_len = ETH_ALEN; | |
387 | retval = rndis_query(dev, intf, u.buf, OID_802_3_PERMANENT_ADDRESS, | |
388 | 48, (void **) &bp, &reply_len); | |
389 | if (unlikely(retval< 0)) { | |
64e04910 | 390 | dev_err(&intf->dev, "rndis get ethaddr, %d\n", retval); |
9ff55874 | 391 | goto halt_fail_and_release; |
64e04910 | 392 | } |
ddda0862 | 393 | memcpy(net->dev_addr, bp, ETH_ALEN); |
64e04910 DB |
394 | |
395 | /* set a nonzero filter to enable data transfers */ | |
396 | memset(u.set, 0, sizeof *u.set); | |
397 | u.set->msg_type = RNDIS_MSG_SET; | |
398 | u.set->msg_len = ccpu2(4 + sizeof *u.set); | |
399 | u.set->oid = OID_GEN_CURRENT_PACKET_FILTER; | |
400 | u.set->len = ccpu2(4); | |
401 | u.set->offset = ccpu2((sizeof *u.set) - 8); | |
a842edac | 402 | *(__le32 *)(u.buf + sizeof *u.set) = RNDIS_DEFAULT_FILTER; |
64e04910 DB |
403 | |
404 | retval = rndis_command(dev, u.header); | |
405 | if (unlikely(retval < 0)) { | |
406 | dev_err(&intf->dev, "rndis set packet filter, %d\n", retval); | |
9ff55874 | 407 | goto halt_fail_and_release; |
64e04910 DB |
408 | } |
409 | ||
410 | retval = 0; | |
deb31f17 DG |
411 | |
412 | kfree(u.buf); | |
413 | return retval; | |
414 | ||
9ff55874 JK |
415 | halt_fail_and_release: |
416 | memset(u.halt, 0, sizeof *u.halt); | |
417 | u.halt->msg_type = RNDIS_MSG_HALT; | |
418 | u.halt->msg_len = ccpu2(sizeof *u.halt); | |
419 | (void) rndis_command(dev, (void *)u.halt); | |
deb31f17 DG |
420 | fail_and_release: |
421 | usb_set_intfdata(info->data, NULL); | |
422 | usb_driver_release_interface(driver_of(intf), info->data); | |
ddda0862 | 423 | info->data = NULL; |
deb31f17 | 424 | fail: |
64e04910 DB |
425 | kfree(u.buf); |
426 | return retval; | |
427 | } | |
5665998c | 428 | EXPORT_SYMBOL_GPL(generic_rndis_bind); |
64e04910 | 429 | |
039ee17d JK |
430 | static int rndis_bind(struct usbnet *dev, struct usb_interface *intf) |
431 | { | |
432 | return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS); | |
433 | } | |
434 | ||
5665998c | 435 | void rndis_unbind(struct usbnet *dev, struct usb_interface *intf) |
64e04910 DB |
436 | { |
437 | struct rndis_halt *halt; | |
438 | ||
439 | /* try to clear any rndis state/activity (no i/o from stack!) */ | |
04c3c01a | 440 | halt = kzalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL); |
64e04910 DB |
441 | if (halt) { |
442 | halt->msg_type = RNDIS_MSG_HALT; | |
443 | halt->msg_len = ccpu2(sizeof *halt); | |
444 | (void) rndis_command(dev, (void *)halt); | |
445 | kfree(halt); | |
446 | } | |
447 | ||
2bfa2e1f | 448 | usbnet_cdc_unbind(dev, intf); |
64e04910 | 449 | } |
5665998c | 450 | EXPORT_SYMBOL_GPL(rndis_unbind); |
64e04910 DB |
451 | |
452 | /* | |
453 | * DATA -- host must not write zlps | |
454 | */ | |
5665998c | 455 | int rndis_rx_fixup(struct usbnet *dev, struct sk_buff *skb) |
64e04910 DB |
456 | { |
457 | /* peripheral may have batched packets to us... */ | |
458 | while (likely(skb->len)) { | |
459 | struct rndis_data_hdr *hdr = (void *)skb->data; | |
460 | struct sk_buff *skb2; | |
461 | u32 msg_len, data_offset, data_len; | |
462 | ||
463 | msg_len = le32_to_cpu(hdr->msg_len); | |
464 | data_offset = le32_to_cpu(hdr->data_offset); | |
465 | data_len = le32_to_cpu(hdr->data_len); | |
466 | ||
467 | /* don't choke if we see oob, per-packet data, etc */ | |
468 | if (unlikely(hdr->msg_type != RNDIS_MSG_PACKET | |
469 | || skb->len < msg_len | |
470 | || (data_offset + data_len + 8) > msg_len)) { | |
471 | dev->stats.rx_frame_errors++; | |
472 | devdbg(dev, "bad rndis message %d/%d/%d/%d, len %d", | |
473 | le32_to_cpu(hdr->msg_type), | |
474 | msg_len, data_offset, data_len, skb->len); | |
475 | return 0; | |
476 | } | |
477 | skb_pull(skb, 8 + data_offset); | |
478 | ||
479 | /* at most one packet left? */ | |
480 | if (likely((data_len - skb->len) <= sizeof *hdr)) { | |
481 | skb_trim(skb, data_len); | |
482 | break; | |
483 | } | |
484 | ||
485 | /* try to return all the packets in the batch */ | |
486 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
487 | if (unlikely(!skb2)) | |
488 | break; | |
489 | skb_pull(skb, msg_len - sizeof *hdr); | |
490 | skb_trim(skb2, data_len); | |
491 | usbnet_skb_return(dev, skb2); | |
492 | } | |
493 | ||
494 | /* caller will usbnet_skb_return the remaining packet */ | |
495 | return 1; | |
496 | } | |
5665998c | 497 | EXPORT_SYMBOL_GPL(rndis_rx_fixup); |
64e04910 | 498 | |
5665998c | 499 | struct sk_buff * |
55016f10 | 500 | rndis_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) |
64e04910 DB |
501 | { |
502 | struct rndis_data_hdr *hdr; | |
503 | struct sk_buff *skb2; | |
504 | unsigned len = skb->len; | |
505 | ||
506 | if (likely(!skb_cloned(skb))) { | |
507 | int room = skb_headroom(skb); | |
508 | ||
509 | /* enough head room as-is? */ | |
510 | if (unlikely((sizeof *hdr) <= room)) | |
511 | goto fill; | |
512 | ||
513 | /* enough room, but needs to be readjusted? */ | |
514 | room += skb_tailroom(skb); | |
515 | if (likely((sizeof *hdr) <= room)) { | |
516 | skb->data = memmove(skb->head + sizeof *hdr, | |
517 | skb->data, len); | |
27a884dc | 518 | skb_set_tail_pointer(skb, len); |
64e04910 DB |
519 | goto fill; |
520 | } | |
521 | } | |
522 | ||
523 | /* create a new skb, with the correct size (and tailpad) */ | |
524 | skb2 = skb_copy_expand(skb, sizeof *hdr, 1, flags); | |
525 | dev_kfree_skb_any(skb); | |
526 | if (unlikely(!skb2)) | |
527 | return skb2; | |
528 | skb = skb2; | |
529 | ||
530 | /* fill out the RNDIS header. we won't bother trying to batch | |
531 | * packets; Linux minimizes wasted bandwidth through tx queues. | |
532 | */ | |
533 | fill: | |
534 | hdr = (void *) __skb_push(skb, sizeof *hdr); | |
535 | memset(hdr, 0, sizeof *hdr); | |
536 | hdr->msg_type = RNDIS_MSG_PACKET; | |
537 | hdr->msg_len = cpu_to_le32(skb->len); | |
538 | hdr->data_offset = ccpu2(sizeof(*hdr) - 8); | |
539 | hdr->data_len = cpu_to_le32(len); | |
540 | ||
541 | /* FIXME make the last packet always be short ... */ | |
542 | return skb; | |
543 | } | |
5665998c | 544 | EXPORT_SYMBOL_GPL(rndis_tx_fixup); |
64e04910 DB |
545 | |
546 | ||
547 | static const struct driver_info rndis_info = { | |
548 | .description = "RNDIS device", | |
ddda0862 | 549 | .flags = FLAG_ETHER | FLAG_FRAMING_RN | FLAG_NO_SETINT, |
039ee17d | 550 | .bind = rndis_bind, |
64e04910 DB |
551 | .unbind = rndis_unbind, |
552 | .status = rndis_status, | |
553 | .rx_fixup = rndis_rx_fixup, | |
554 | .tx_fixup = rndis_tx_fixup, | |
555 | }; | |
556 | ||
557 | #undef ccpu2 | |
558 | ||
559 | ||
560 | /*-------------------------------------------------------------------------*/ | |
561 | ||
562 | static const struct usb_device_id products [] = { | |
563 | { | |
564 | /* RNDIS is MSFT's un-official variant of CDC ACM */ | |
565 | USB_INTERFACE_INFO(USB_CLASS_COMM, 2 /* ACM */, 0x0ff), | |
566 | .driver_info = (unsigned long) &rndis_info, | |
ad55d71a OAVR |
567 | }, { |
568 | /* "ActiveSync" is an undocumented variant of RNDIS, used in WM5 */ | |
569 | USB_INTERFACE_INFO(USB_CLASS_MISC, 1, 1), | |
570 | .driver_info = (unsigned long) &rndis_info, | |
64e04910 DB |
571 | }, |
572 | { }, // END | |
573 | }; | |
574 | MODULE_DEVICE_TABLE(usb, products); | |
575 | ||
576 | static struct usb_driver rndis_driver = { | |
64e04910 DB |
577 | .name = "rndis_host", |
578 | .id_table = products, | |
579 | .probe = usbnet_probe, | |
580 | .disconnect = usbnet_disconnect, | |
581 | .suspend = usbnet_suspend, | |
582 | .resume = usbnet_resume, | |
583 | }; | |
584 | ||
585 | static int __init rndis_init(void) | |
586 | { | |
51400f1d | 587 | return usb_register(&rndis_driver); |
64e04910 DB |
588 | } |
589 | module_init(rndis_init); | |
590 | ||
591 | static void __exit rndis_exit(void) | |
592 | { | |
51400f1d | 593 | usb_deregister(&rndis_driver); |
64e04910 DB |
594 | } |
595 | module_exit(rndis_exit); | |
596 | ||
597 | MODULE_AUTHOR("David Brownell"); | |
598 | MODULE_DESCRIPTION("USB Host side RNDIS driver"); | |
599 | MODULE_LICENSE("GPL"); |