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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 DB |
23 | #include <linux/module.h> |
24 | #include <linux/sched.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/etherdevice.h> | |
28 | #include <linux/ethtool.h> | |
29 | #include <linux/workqueue.h> | |
30 | #include <linux/mii.h> | |
31 | #include <linux/usb.h> | |
a8c28f23 | 32 | #include <linux/usb/cdc.h> |
64e04910 DB |
33 | |
34 | #include "usbnet.h" | |
35 | ||
36 | ||
37 | /* | |
38 | * RNDIS is NDIS remoted over USB. It's a MSFT variant of CDC ACM ... of | |
39 | * course ACM was intended for modems, not Ethernet links! USB's standard | |
40 | * for Ethernet links is "CDC Ethernet", which is significantly simpler. | |
51400f1d DB |
41 | * |
42 | * NOTE that Microsoft's "RNDIS 1.0" specification is incomplete. Issues | |
43 | * include: | |
44 | * - Power management in particular relies on information that's scattered | |
45 | * through other documentation, and which is incomplete or incorrect even | |
46 | * there. | |
47 | * - There are various undocumented protocol requirements, such as the | |
48 | * need to send unused garbage in control-OUT messages. | |
49 | * - In some cases, MS-Windows will emit undocumented requests; this | |
50 | * matters more to peripheral implementations than host ones. | |
51 | * | |
52 | * For these reasons and others, ** USE OF RNDIS IS STRONGLY DISCOURAGED ** in | |
53 | * favor of such non-proprietary alternatives as CDC Ethernet or the newer (and | |
54 | * currently rare) "Ethernet Emulation Model" (EEM). | |
64e04910 DB |
55 | */ |
56 | ||
57 | /* | |
58 | * CONTROL uses CDC "encapsulated commands" with funky notifications. | |
59 | * - control-out: SEND_ENCAPSULATED | |
60 | * - interrupt-in: RESPONSE_AVAILABLE | |
61 | * - control-in: GET_ENCAPSULATED | |
62 | * | |
63 | * We'll try to ignore the RESPONSE_AVAILABLE notifications. | |
64 | */ | |
65 | struct rndis_msg_hdr { | |
66 | __le32 msg_type; /* RNDIS_MSG_* */ | |
67 | __le32 msg_len; | |
68 | // followed by data that varies between messages | |
69 | __le32 request_id; | |
70 | __le32 status; | |
71 | // ... and more | |
72 | } __attribute__ ((packed)); | |
73 | ||
74 | /* RNDIS defines this (absurdly huge) control timeout */ | |
75 | #define RNDIS_CONTROL_TIMEOUT_MS (10 * 1000) | |
76 | ||
77 | ||
78 | #define ccpu2 __constant_cpu_to_le32 | |
79 | ||
80 | #define RNDIS_MSG_COMPLETION ccpu2(0x80000000) | |
81 | ||
82 | /* codes for "msg_type" field of rndis messages; | |
83 | * only the data channel uses packet messages (maybe batched); | |
84 | * everything else goes on the control channel. | |
85 | */ | |
86 | #define RNDIS_MSG_PACKET ccpu2(0x00000001) /* 1-N packets */ | |
87 | #define RNDIS_MSG_INIT ccpu2(0x00000002) | |
51400f1d | 88 | #define RNDIS_MSG_INIT_C (RNDIS_MSG_INIT|RNDIS_MSG_COMPLETION) |
64e04910 DB |
89 | #define RNDIS_MSG_HALT ccpu2(0x00000003) |
90 | #define RNDIS_MSG_QUERY ccpu2(0x00000004) | |
51400f1d | 91 | #define RNDIS_MSG_QUERY_C (RNDIS_MSG_QUERY|RNDIS_MSG_COMPLETION) |
64e04910 | 92 | #define RNDIS_MSG_SET ccpu2(0x00000005) |
51400f1d | 93 | #define RNDIS_MSG_SET_C (RNDIS_MSG_SET|RNDIS_MSG_COMPLETION) |
64e04910 | 94 | #define RNDIS_MSG_RESET ccpu2(0x00000006) |
51400f1d | 95 | #define RNDIS_MSG_RESET_C (RNDIS_MSG_RESET|RNDIS_MSG_COMPLETION) |
64e04910 DB |
96 | #define RNDIS_MSG_INDICATE ccpu2(0x00000007) |
97 | #define RNDIS_MSG_KEEPALIVE ccpu2(0x00000008) | |
51400f1d | 98 | #define RNDIS_MSG_KEEPALIVE_C (RNDIS_MSG_KEEPALIVE|RNDIS_MSG_COMPLETION) |
64e04910 DB |
99 | |
100 | /* codes for "status" field of completion messages */ | |
101 | #define RNDIS_STATUS_SUCCESS ccpu2(0x00000000) | |
102 | #define RNDIS_STATUS_FAILURE ccpu2(0xc0000001) | |
103 | #define RNDIS_STATUS_INVALID_DATA ccpu2(0xc0010015) | |
104 | #define RNDIS_STATUS_NOT_SUPPORTED ccpu2(0xc00000bb) | |
105 | #define RNDIS_STATUS_MEDIA_CONNECT ccpu2(0x4001000b) | |
106 | #define RNDIS_STATUS_MEDIA_DISCONNECT ccpu2(0x4001000c) | |
107 | ||
108 | ||
109 | struct rndis_data_hdr { | |
110 | __le32 msg_type; /* RNDIS_MSG_PACKET */ | |
111 | __le32 msg_len; // rndis_data_hdr + data_len + pad | |
112 | __le32 data_offset; // 36 -- right after header | |
113 | __le32 data_len; // ... real packet size | |
114 | ||
115 | __le32 oob_data_offset; // zero | |
116 | __le32 oob_data_len; // zero | |
117 | __le32 num_oob; // zero | |
118 | __le32 packet_data_offset; // zero | |
119 | ||
120 | __le32 packet_data_len; // zero | |
121 | __le32 vc_handle; // zero | |
122 | __le32 reserved; // zero | |
123 | } __attribute__ ((packed)); | |
124 | ||
125 | struct rndis_init { /* OUT */ | |
126 | // header and: | |
127 | __le32 msg_type; /* RNDIS_MSG_INIT */ | |
128 | __le32 msg_len; // 24 | |
129 | __le32 request_id; | |
130 | __le32 major_version; // of rndis (1.0) | |
131 | __le32 minor_version; | |
132 | __le32 max_transfer_size; | |
133 | } __attribute__ ((packed)); | |
134 | ||
135 | struct rndis_init_c { /* IN */ | |
136 | // header and: | |
137 | __le32 msg_type; /* RNDIS_MSG_INIT_C */ | |
138 | __le32 msg_len; | |
139 | __le32 request_id; | |
140 | __le32 status; | |
141 | __le32 major_version; // of rndis (1.0) | |
142 | __le32 minor_version; | |
143 | __le32 device_flags; | |
144 | __le32 medium; // zero == 802.3 | |
145 | __le32 max_packets_per_message; | |
146 | __le32 max_transfer_size; | |
147 | __le32 packet_alignment; // max 7; (1<<n) bytes | |
148 | __le32 af_list_offset; // zero | |
149 | __le32 af_list_size; // zero | |
150 | } __attribute__ ((packed)); | |
151 | ||
152 | struct rndis_halt { /* OUT (no reply) */ | |
153 | // header and: | |
154 | __le32 msg_type; /* RNDIS_MSG_HALT */ | |
155 | __le32 msg_len; | |
156 | __le32 request_id; | |
157 | } __attribute__ ((packed)); | |
158 | ||
159 | struct rndis_query { /* OUT */ | |
160 | // header and: | |
161 | __le32 msg_type; /* RNDIS_MSG_QUERY */ | |
162 | __le32 msg_len; | |
163 | __le32 request_id; | |
164 | __le32 oid; | |
165 | __le32 len; | |
166 | __le32 offset; | |
167 | /*?*/ __le32 handle; // zero | |
168 | } __attribute__ ((packed)); | |
169 | ||
170 | struct rndis_query_c { /* IN */ | |
171 | // header and: | |
172 | __le32 msg_type; /* RNDIS_MSG_QUERY_C */ | |
173 | __le32 msg_len; | |
174 | __le32 request_id; | |
175 | __le32 status; | |
176 | __le32 len; | |
177 | __le32 offset; | |
178 | } __attribute__ ((packed)); | |
179 | ||
180 | struct rndis_set { /* OUT */ | |
181 | // header and: | |
182 | __le32 msg_type; /* RNDIS_MSG_SET */ | |
183 | __le32 msg_len; | |
184 | __le32 request_id; | |
185 | __le32 oid; | |
186 | __le32 len; | |
187 | __le32 offset; | |
188 | /*?*/ __le32 handle; // zero | |
189 | } __attribute__ ((packed)); | |
190 | ||
191 | struct rndis_set_c { /* IN */ | |
192 | // header and: | |
193 | __le32 msg_type; /* RNDIS_MSG_SET_C */ | |
194 | __le32 msg_len; | |
195 | __le32 request_id; | |
196 | __le32 status; | |
197 | } __attribute__ ((packed)); | |
198 | ||
199 | struct rndis_reset { /* IN */ | |
200 | // header and: | |
201 | __le32 msg_type; /* RNDIS_MSG_RESET */ | |
202 | __le32 msg_len; | |
203 | __le32 reserved; | |
204 | } __attribute__ ((packed)); | |
205 | ||
206 | struct rndis_reset_c { /* OUT */ | |
207 | // header and: | |
208 | __le32 msg_type; /* RNDIS_MSG_RESET_C */ | |
209 | __le32 msg_len; | |
210 | __le32 status; | |
211 | __le32 addressing_lost; | |
212 | } __attribute__ ((packed)); | |
213 | ||
214 | struct rndis_indicate { /* IN (unrequested) */ | |
215 | // header and: | |
216 | __le32 msg_type; /* RNDIS_MSG_INDICATE */ | |
217 | __le32 msg_len; | |
218 | __le32 status; | |
219 | __le32 length; | |
220 | __le32 offset; | |
221 | /**/ __le32 diag_status; | |
222 | __le32 error_offset; | |
223 | /**/ __le32 message; | |
224 | } __attribute__ ((packed)); | |
225 | ||
226 | struct rndis_keepalive { /* OUT (optionally IN) */ | |
227 | // header and: | |
228 | __le32 msg_type; /* RNDIS_MSG_KEEPALIVE */ | |
229 | __le32 msg_len; | |
230 | __le32 request_id; | |
231 | } __attribute__ ((packed)); | |
232 | ||
233 | struct rndis_keepalive_c { /* IN (optionally OUT) */ | |
234 | // header and: | |
235 | __le32 msg_type; /* RNDIS_MSG_KEEPALIVE_C */ | |
236 | __le32 msg_len; | |
237 | __le32 request_id; | |
238 | __le32 status; | |
239 | } __attribute__ ((packed)); | |
240 | ||
241 | /* NOTE: about 30 OIDs are "mandatory" for peripherals to support ... and | |
242 | * there are gobs more that may optionally be supported. We'll avoid as much | |
243 | * of that mess as possible. | |
244 | */ | |
245 | #define OID_802_3_PERMANENT_ADDRESS ccpu2(0x01010101) | |
246 | #define OID_GEN_CURRENT_PACKET_FILTER ccpu2(0x0001010e) | |
247 | ||
248 | /* | |
249 | * RNDIS notifications from device: command completion; "reverse" | |
250 | * keepalives; etc | |
251 | */ | |
252 | static void rndis_status(struct usbnet *dev, struct urb *urb) | |
253 | { | |
254 | devdbg(dev, "rndis status urb, len %d stat %d", | |
255 | urb->actual_length, urb->status); | |
256 | // FIXME for keepalives, respond immediately (asynchronously) | |
257 | // if not an RNDIS status, do like cdc_status(dev,urb) does | |
258 | } | |
259 | ||
260 | /* | |
261 | * RPC done RNDIS-style. Caller guarantees: | |
262 | * - message is properly byteswapped | |
263 | * - there's no other request pending | |
264 | * - buf can hold up to 1KB response (required by RNDIS spec) | |
265 | * On return, the first few entries are already byteswapped. | |
266 | * | |
267 | * Call context is likely probe(), before interface name is known, | |
268 | * which is why we won't try to use it in the diagnostics. | |
269 | */ | |
270 | static int rndis_command(struct usbnet *dev, struct rndis_msg_hdr *buf) | |
271 | { | |
272 | struct cdc_state *info = (void *) &dev->data; | |
273 | int retval; | |
274 | unsigned count; | |
275 | __le32 rsp; | |
276 | u32 xid = 0, msg_len, request_id; | |
277 | ||
278 | /* REVISIT when this gets called from contexts other than probe() or | |
279 | * disconnect(): either serialize, or dispatch responses on xid | |
280 | */ | |
281 | ||
282 | /* Issue the request; don't bother byteswapping our xid */ | |
283 | if (likely(buf->msg_type != RNDIS_MSG_HALT | |
284 | && buf->msg_type != RNDIS_MSG_RESET)) { | |
285 | xid = dev->xid++; | |
286 | if (!xid) | |
287 | xid = dev->xid++; | |
288 | buf->request_id = (__force __le32) xid; | |
289 | } | |
290 | retval = usb_control_msg(dev->udev, | |
291 | usb_sndctrlpipe(dev->udev, 0), | |
292 | USB_CDC_SEND_ENCAPSULATED_COMMAND, | |
293 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
294 | 0, info->u->bMasterInterface0, | |
295 | buf, le32_to_cpu(buf->msg_len), | |
296 | RNDIS_CONTROL_TIMEOUT_MS); | |
297 | if (unlikely(retval < 0 || xid == 0)) | |
298 | return retval; | |
299 | ||
300 | // FIXME Seems like some devices discard responses when | |
301 | // we time out and cancel our "get response" requests... | |
302 | // so, this is fragile. Probably need to poll for status. | |
303 | ||
304 | /* ignore status endpoint, just poll the control channel; | |
305 | * the request probably completed immediately | |
306 | */ | |
307 | rsp = buf->msg_type | RNDIS_MSG_COMPLETION; | |
308 | for (count = 0; count < 10; count++) { | |
309 | memset(buf, 0, 1024); | |
310 | retval = usb_control_msg(dev->udev, | |
311 | usb_rcvctrlpipe(dev->udev, 0), | |
312 | USB_CDC_GET_ENCAPSULATED_RESPONSE, | |
313 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
314 | 0, info->u->bMasterInterface0, | |
315 | buf, 1024, | |
316 | RNDIS_CONTROL_TIMEOUT_MS); | |
317 | if (likely(retval >= 8)) { | |
318 | msg_len = le32_to_cpu(buf->msg_len); | |
319 | request_id = (__force u32) buf->request_id; | |
320 | if (likely(buf->msg_type == rsp)) { | |
321 | if (likely(request_id == xid)) { | |
322 | if (unlikely(rsp == RNDIS_MSG_RESET_C)) | |
323 | return 0; | |
324 | if (likely(RNDIS_STATUS_SUCCESS | |
325 | == buf->status)) | |
326 | return 0; | |
327 | dev_dbg(&info->control->dev, | |
328 | "rndis reply status %08x\n", | |
329 | le32_to_cpu(buf->status)); | |
330 | return -EL3RST; | |
331 | } | |
332 | dev_dbg(&info->control->dev, | |
333 | "rndis reply id %d expected %d\n", | |
334 | request_id, xid); | |
335 | /* then likely retry */ | |
336 | } else switch (buf->msg_type) { | |
337 | case RNDIS_MSG_INDICATE: { /* fault */ | |
338 | // struct rndis_indicate *msg = (void *)buf; | |
339 | dev_info(&info->control->dev, | |
340 | "rndis fault indication\n"); | |
341 | } | |
342 | break; | |
343 | case RNDIS_MSG_KEEPALIVE: { /* ping */ | |
344 | struct rndis_keepalive_c *msg = (void *)buf; | |
345 | ||
346 | msg->msg_type = RNDIS_MSG_KEEPALIVE_C; | |
347 | msg->msg_len = ccpu2(sizeof *msg); | |
348 | msg->status = RNDIS_STATUS_SUCCESS; | |
349 | retval = usb_control_msg(dev->udev, | |
350 | usb_sndctrlpipe(dev->udev, 0), | |
351 | USB_CDC_SEND_ENCAPSULATED_COMMAND, | |
352 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
353 | 0, info->u->bMasterInterface0, | |
354 | msg, sizeof *msg, | |
355 | RNDIS_CONTROL_TIMEOUT_MS); | |
356 | if (unlikely(retval < 0)) | |
357 | dev_dbg(&info->control->dev, | |
358 | "rndis keepalive err %d\n", | |
359 | retval); | |
360 | } | |
361 | break; | |
362 | default: | |
363 | dev_dbg(&info->control->dev, | |
364 | "unexpected rndis msg %08x len %d\n", | |
365 | le32_to_cpu(buf->msg_type), msg_len); | |
366 | } | |
367 | } else { | |
368 | /* device probably issued a protocol stall; ignore */ | |
369 | dev_dbg(&info->control->dev, | |
370 | "rndis response error, code %d\n", retval); | |
371 | } | |
372 | msleep(2); | |
373 | } | |
374 | dev_dbg(&info->control->dev, "rndis response timeout\n"); | |
375 | return -ETIMEDOUT; | |
376 | } | |
377 | ||
378 | static int rndis_bind(struct usbnet *dev, struct usb_interface *intf) | |
379 | { | |
380 | int retval; | |
381 | struct net_device *net = dev->net; | |
382 | union { | |
383 | void *buf; | |
384 | struct rndis_msg_hdr *header; | |
385 | struct rndis_init *init; | |
386 | struct rndis_init_c *init_c; | |
387 | struct rndis_query *get; | |
388 | struct rndis_query_c *get_c; | |
389 | struct rndis_set *set; | |
390 | struct rndis_set_c *set_c; | |
391 | } u; | |
392 | u32 tmp; | |
393 | ||
394 | /* we can't rely on i/o from stack working, or stack allocation */ | |
395 | u.buf = kmalloc(1024, GFP_KERNEL); | |
396 | if (!u.buf) | |
397 | return -ENOMEM; | |
398 | retval = usbnet_generic_cdc_bind(dev, intf); | |
399 | if (retval < 0) | |
400 | goto done; | |
401 | ||
402 | net->hard_header_len += sizeof (struct rndis_data_hdr); | |
403 | ||
404 | /* initialize; max transfer is 16KB at full speed */ | |
405 | u.init->msg_type = RNDIS_MSG_INIT; | |
406 | u.init->msg_len = ccpu2(sizeof *u.init); | |
407 | u.init->major_version = ccpu2(1); | |
408 | u.init->minor_version = ccpu2(0); | |
409 | u.init->max_transfer_size = ccpu2(net->mtu + net->hard_header_len); | |
410 | ||
411 | retval = rndis_command(dev, u.header); | |
412 | if (unlikely(retval < 0)) { | |
413 | /* it might not even be an RNDIS device!! */ | |
414 | dev_err(&intf->dev, "RNDIS init failed, %d\n", retval); | |
415 | fail: | |
416 | usb_driver_release_interface(driver_of(intf), | |
417 | ((struct cdc_state *)&(dev->data))->data); | |
418 | goto done; | |
419 | } | |
420 | dev->hard_mtu = le32_to_cpu(u.init_c->max_transfer_size); | |
421 | /* REVISIT: peripheral "alignment" request is ignored ... */ | |
422 | dev_dbg(&intf->dev, "hard mtu %u, align %d\n", dev->hard_mtu, | |
423 | 1 << le32_to_cpu(u.init_c->packet_alignment)); | |
424 | ||
425 | /* get designated host ethernet address */ | |
426 | memset(u.get, 0, sizeof *u.get); | |
427 | u.get->msg_type = RNDIS_MSG_QUERY; | |
428 | u.get->msg_len = ccpu2(sizeof *u.get); | |
429 | u.get->oid = OID_802_3_PERMANENT_ADDRESS; | |
430 | ||
431 | retval = rndis_command(dev, u.header); | |
432 | if (unlikely(retval < 0)) { | |
433 | dev_err(&intf->dev, "rndis get ethaddr, %d\n", retval); | |
434 | goto fail; | |
435 | } | |
436 | tmp = le32_to_cpu(u.get_c->offset); | |
437 | if (unlikely((tmp + 8) > (1024 - ETH_ALEN) | |
438 | || u.get_c->len != ccpu2(ETH_ALEN))) { | |
439 | dev_err(&intf->dev, "rndis ethaddr off %d len %d ?\n", | |
440 | tmp, le32_to_cpu(u.get_c->len)); | |
441 | retval = -EDOM; | |
442 | goto fail; | |
443 | } | |
444 | memcpy(net->dev_addr, tmp + (char *)&u.get_c->request_id, ETH_ALEN); | |
445 | ||
446 | /* set a nonzero filter to enable data transfers */ | |
447 | memset(u.set, 0, sizeof *u.set); | |
448 | u.set->msg_type = RNDIS_MSG_SET; | |
449 | u.set->msg_len = ccpu2(4 + sizeof *u.set); | |
450 | u.set->oid = OID_GEN_CURRENT_PACKET_FILTER; | |
451 | u.set->len = ccpu2(4); | |
452 | u.set->offset = ccpu2((sizeof *u.set) - 8); | |
453 | *(__le32 *)(u.buf + sizeof *u.set) = ccpu2(DEFAULT_FILTER); | |
454 | ||
455 | retval = rndis_command(dev, u.header); | |
456 | if (unlikely(retval < 0)) { | |
457 | dev_err(&intf->dev, "rndis set packet filter, %d\n", retval); | |
458 | goto fail; | |
459 | } | |
460 | ||
461 | retval = 0; | |
462 | done: | |
463 | kfree(u.buf); | |
464 | return retval; | |
465 | } | |
466 | ||
467 | static void rndis_unbind(struct usbnet *dev, struct usb_interface *intf) | |
468 | { | |
469 | struct rndis_halt *halt; | |
470 | ||
471 | /* try to clear any rndis state/activity (no i/o from stack!) */ | |
cd861280 | 472 | halt = kzalloc(sizeof *halt, GFP_KERNEL); |
64e04910 DB |
473 | if (halt) { |
474 | halt->msg_type = RNDIS_MSG_HALT; | |
475 | halt->msg_len = ccpu2(sizeof *halt); | |
476 | (void) rndis_command(dev, (void *)halt); | |
477 | kfree(halt); | |
478 | } | |
479 | ||
480 | return usbnet_cdc_unbind(dev, intf); | |
481 | } | |
482 | ||
483 | /* | |
484 | * DATA -- host must not write zlps | |
485 | */ | |
486 | static int rndis_rx_fixup(struct usbnet *dev, struct sk_buff *skb) | |
487 | { | |
488 | /* peripheral may have batched packets to us... */ | |
489 | while (likely(skb->len)) { | |
490 | struct rndis_data_hdr *hdr = (void *)skb->data; | |
491 | struct sk_buff *skb2; | |
492 | u32 msg_len, data_offset, data_len; | |
493 | ||
494 | msg_len = le32_to_cpu(hdr->msg_len); | |
495 | data_offset = le32_to_cpu(hdr->data_offset); | |
496 | data_len = le32_to_cpu(hdr->data_len); | |
497 | ||
498 | /* don't choke if we see oob, per-packet data, etc */ | |
499 | if (unlikely(hdr->msg_type != RNDIS_MSG_PACKET | |
500 | || skb->len < msg_len | |
501 | || (data_offset + data_len + 8) > msg_len)) { | |
502 | dev->stats.rx_frame_errors++; | |
503 | devdbg(dev, "bad rndis message %d/%d/%d/%d, len %d", | |
504 | le32_to_cpu(hdr->msg_type), | |
505 | msg_len, data_offset, data_len, skb->len); | |
506 | return 0; | |
507 | } | |
508 | skb_pull(skb, 8 + data_offset); | |
509 | ||
510 | /* at most one packet left? */ | |
511 | if (likely((data_len - skb->len) <= sizeof *hdr)) { | |
512 | skb_trim(skb, data_len); | |
513 | break; | |
514 | } | |
515 | ||
516 | /* try to return all the packets in the batch */ | |
517 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
518 | if (unlikely(!skb2)) | |
519 | break; | |
520 | skb_pull(skb, msg_len - sizeof *hdr); | |
521 | skb_trim(skb2, data_len); | |
522 | usbnet_skb_return(dev, skb2); | |
523 | } | |
524 | ||
525 | /* caller will usbnet_skb_return the remaining packet */ | |
526 | return 1; | |
527 | } | |
528 | ||
529 | static struct sk_buff * | |
55016f10 | 530 | rndis_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) |
64e04910 DB |
531 | { |
532 | struct rndis_data_hdr *hdr; | |
533 | struct sk_buff *skb2; | |
534 | unsigned len = skb->len; | |
535 | ||
536 | if (likely(!skb_cloned(skb))) { | |
537 | int room = skb_headroom(skb); | |
538 | ||
539 | /* enough head room as-is? */ | |
540 | if (unlikely((sizeof *hdr) <= room)) | |
541 | goto fill; | |
542 | ||
543 | /* enough room, but needs to be readjusted? */ | |
544 | room += skb_tailroom(skb); | |
545 | if (likely((sizeof *hdr) <= room)) { | |
546 | skb->data = memmove(skb->head + sizeof *hdr, | |
547 | skb->data, len); | |
548 | skb->tail = skb->data + len; | |
549 | goto fill; | |
550 | } | |
551 | } | |
552 | ||
553 | /* create a new skb, with the correct size (and tailpad) */ | |
554 | skb2 = skb_copy_expand(skb, sizeof *hdr, 1, flags); | |
555 | dev_kfree_skb_any(skb); | |
556 | if (unlikely(!skb2)) | |
557 | return skb2; | |
558 | skb = skb2; | |
559 | ||
560 | /* fill out the RNDIS header. we won't bother trying to batch | |
561 | * packets; Linux minimizes wasted bandwidth through tx queues. | |
562 | */ | |
563 | fill: | |
564 | hdr = (void *) __skb_push(skb, sizeof *hdr); | |
565 | memset(hdr, 0, sizeof *hdr); | |
566 | hdr->msg_type = RNDIS_MSG_PACKET; | |
567 | hdr->msg_len = cpu_to_le32(skb->len); | |
568 | hdr->data_offset = ccpu2(sizeof(*hdr) - 8); | |
569 | hdr->data_len = cpu_to_le32(len); | |
570 | ||
571 | /* FIXME make the last packet always be short ... */ | |
572 | return skb; | |
573 | } | |
574 | ||
575 | ||
576 | static const struct driver_info rndis_info = { | |
577 | .description = "RNDIS device", | |
578 | .flags = FLAG_ETHER | FLAG_FRAMING_RN, | |
579 | .bind = rndis_bind, | |
580 | .unbind = rndis_unbind, | |
581 | .status = rndis_status, | |
582 | .rx_fixup = rndis_rx_fixup, | |
583 | .tx_fixup = rndis_tx_fixup, | |
584 | }; | |
585 | ||
586 | #undef ccpu2 | |
587 | ||
588 | ||
589 | /*-------------------------------------------------------------------------*/ | |
590 | ||
591 | static const struct usb_device_id products [] = { | |
592 | { | |
593 | /* RNDIS is MSFT's un-official variant of CDC ACM */ | |
594 | USB_INTERFACE_INFO(USB_CLASS_COMM, 2 /* ACM */, 0x0ff), | |
595 | .driver_info = (unsigned long) &rndis_info, | |
596 | }, | |
597 | { }, // END | |
598 | }; | |
599 | MODULE_DEVICE_TABLE(usb, products); | |
600 | ||
601 | static struct usb_driver rndis_driver = { | |
64e04910 DB |
602 | .name = "rndis_host", |
603 | .id_table = products, | |
604 | .probe = usbnet_probe, | |
605 | .disconnect = usbnet_disconnect, | |
606 | .suspend = usbnet_suspend, | |
607 | .resume = usbnet_resume, | |
608 | }; | |
609 | ||
610 | static int __init rndis_init(void) | |
611 | { | |
51400f1d | 612 | return usb_register(&rndis_driver); |
64e04910 DB |
613 | } |
614 | module_init(rndis_init); | |
615 | ||
616 | static void __exit rndis_exit(void) | |
617 | { | |
51400f1d | 618 | usb_deregister(&rndis_driver); |
64e04910 DB |
619 | } |
620 | module_exit(rndis_exit); | |
621 | ||
622 | MODULE_AUTHOR("David Brownell"); | |
623 | MODULE_DESCRIPTION("USB Host side RNDIS driver"); | |
624 | MODULE_LICENSE("GPL"); |