1 /*
2  * RNDIS MSG parser
3  *
4  * Authors:	Benedikt Spranger, Pengutronix
5  *		Robert Schwebel, Pengutronix
6  *
7  *              This program is free software; you can redistribute it and/or
8  *              modify it under the terms of the GNU General Public License
9  *              version 2, as published by the Free Software Foundation.
10  *
11  *		This software was originally developed in conformance with
12  *		Microsoft's Remote NDIS Specification License Agreement.
13  *
14  * 03/12/2004 Kai-Uwe Bloem <linux-development@auerswald.de>
15  *		Fixed message length bug in init_response
16  *
17  * 03/25/2004 Kai-Uwe Bloem <linux-development@auerswald.de>
18  *		Fixed rndis_rm_hdr length bug.
19  *
20  * Copyright (C) 2004 by David Brownell
21  *		updates to merge with Linux 2.6, better match RNDIS spec
22  */
23 
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <linux/kernel.h>
27 #include <linux/errno.h>
28 #include <linux/init.h>
29 #include <linux/list.h>
30 #include <linux/proc_fs.h>
31 #include <linux/slab.h>
32 #include <linux/seq_file.h>
33 #include <linux/netdevice.h>
34 
35 #include <asm/io.h>
36 #include <asm/byteorder.h>
37 #include <asm/unaligned.h>
38 
39 
40 #undef	VERBOSE_DEBUG
41 
42 #include "rndis.h"
43 
44 
45 /* The driver for your USB chip needs to support ep0 OUT to work with
46  * RNDIS, plus all three CDC Ethernet endpoints (interrupt not optional).
47  *
48  * Windows hosts need an INF file like Documentation/usb/linux.inf
49  * and will be happier if you provide the host_addr module parameter.
50  */
51 
52 #if 0
53 static int rndis_debug = 0;
54 module_param (rndis_debug, int, 0);
55 MODULE_PARM_DESC (rndis_debug, "enable debugging");
56 #else
57 #define rndis_debug		0
58 #endif
59 
60 #define RNDIS_MAX_CONFIGS	1
61 
62 
63 static rndis_params rndis_per_dev_params[RNDIS_MAX_CONFIGS];
64 
65 /* Driver Version */
66 static const __le32 rndis_driver_version = cpu_to_le32(1);
67 
68 /* Function Prototypes */
69 static rndis_resp_t *rndis_add_response(int configNr, u32 length);
70 
71 
72 /* supported OIDs */
73 static const u32 oid_supported_list[] =
74 {
75 	/* the general stuff */
76 	OID_GEN_SUPPORTED_LIST,
77 	OID_GEN_HARDWARE_STATUS,
78 	OID_GEN_MEDIA_SUPPORTED,
79 	OID_GEN_MEDIA_IN_USE,
80 	OID_GEN_MAXIMUM_FRAME_SIZE,
81 	OID_GEN_LINK_SPEED,
82 	OID_GEN_TRANSMIT_BLOCK_SIZE,
83 	OID_GEN_RECEIVE_BLOCK_SIZE,
84 	OID_GEN_VENDOR_ID,
85 	OID_GEN_VENDOR_DESCRIPTION,
86 	OID_GEN_VENDOR_DRIVER_VERSION,
87 	OID_GEN_CURRENT_PACKET_FILTER,
88 	OID_GEN_MAXIMUM_TOTAL_SIZE,
89 	OID_GEN_MEDIA_CONNECT_STATUS,
90 	OID_GEN_PHYSICAL_MEDIUM,
91 
92 	/* the statistical stuff */
93 	OID_GEN_XMIT_OK,
94 	OID_GEN_RCV_OK,
95 	OID_GEN_XMIT_ERROR,
96 	OID_GEN_RCV_ERROR,
97 	OID_GEN_RCV_NO_BUFFER,
98 #ifdef	RNDIS_OPTIONAL_STATS
99 	OID_GEN_DIRECTED_BYTES_XMIT,
100 	OID_GEN_DIRECTED_FRAMES_XMIT,
101 	OID_GEN_MULTICAST_BYTES_XMIT,
102 	OID_GEN_MULTICAST_FRAMES_XMIT,
103 	OID_GEN_BROADCAST_BYTES_XMIT,
104 	OID_GEN_BROADCAST_FRAMES_XMIT,
105 	OID_GEN_DIRECTED_BYTES_RCV,
106 	OID_GEN_DIRECTED_FRAMES_RCV,
107 	OID_GEN_MULTICAST_BYTES_RCV,
108 	OID_GEN_MULTICAST_FRAMES_RCV,
109 	OID_GEN_BROADCAST_BYTES_RCV,
110 	OID_GEN_BROADCAST_FRAMES_RCV,
111 	OID_GEN_RCV_CRC_ERROR,
112 	OID_GEN_TRANSMIT_QUEUE_LENGTH,
113 #endif	/* RNDIS_OPTIONAL_STATS */
114 
115 	/* mandatory 802.3 */
116 	/* the general stuff */
117 	OID_802_3_PERMANENT_ADDRESS,
118 	OID_802_3_CURRENT_ADDRESS,
119 	OID_802_3_MULTICAST_LIST,
120 	OID_802_3_MAC_OPTIONS,
121 	OID_802_3_MAXIMUM_LIST_SIZE,
122 
123 	/* the statistical stuff */
124 	OID_802_3_RCV_ERROR_ALIGNMENT,
125 	OID_802_3_XMIT_ONE_COLLISION,
126 	OID_802_3_XMIT_MORE_COLLISIONS,
127 #ifdef	RNDIS_OPTIONAL_STATS
128 	OID_802_3_XMIT_DEFERRED,
129 	OID_802_3_XMIT_MAX_COLLISIONS,
130 	OID_802_3_RCV_OVERRUN,
131 	OID_802_3_XMIT_UNDERRUN,
132 	OID_802_3_XMIT_HEARTBEAT_FAILURE,
133 	OID_802_3_XMIT_TIMES_CRS_LOST,
134 	OID_802_3_XMIT_LATE_COLLISIONS,
135 #endif	/* RNDIS_OPTIONAL_STATS */
136 
137 #ifdef	RNDIS_PM
138 	/* PM and wakeup are "mandatory" for USB, but the RNDIS specs
139 	 * don't say what they mean ... and the NDIS specs are often
140 	 * confusing and/or ambiguous in this context.  (That is, more
141 	 * so than their specs for the other OIDs.)
142 	 *
143 	 * FIXME someone who knows what these should do, please
144 	 * implement them!
145 	 */
146 
147 	/* power management */
148 	OID_PNP_CAPABILITIES,
149 	OID_PNP_QUERY_POWER,
150 	OID_PNP_SET_POWER,
151 
152 #ifdef	RNDIS_WAKEUP
153 	/* wake up host */
154 	OID_PNP_ENABLE_WAKE_UP,
155 	OID_PNP_ADD_WAKE_UP_PATTERN,
156 	OID_PNP_REMOVE_WAKE_UP_PATTERN,
157 #endif	/* RNDIS_WAKEUP */
158 #endif	/* RNDIS_PM */
159 };
160 
161 
162 /* NDIS Functions */
gen_ndis_query_resp(int configNr,u32 OID,u8 * buf,unsigned buf_len,rndis_resp_t * r)163 static int gen_ndis_query_resp(int configNr, u32 OID, u8 *buf,
164 			       unsigned buf_len, rndis_resp_t *r)
165 {
166 	int retval = -ENOTSUPP;
167 	u32 length = 4;	/* usually */
168 	__le32 *outbuf;
169 	int i, count;
170 	rndis_query_cmplt_type *resp;
171 	struct net_device *net;
172 	struct rtnl_link_stats64 temp;
173 	const struct rtnl_link_stats64 *stats;
174 
175 	if (!r) return -ENOMEM;
176 	resp = (rndis_query_cmplt_type *)r->buf;
177 
178 	if (!resp) return -ENOMEM;
179 
180 	if (buf_len && rndis_debug > 1) {
181 		pr_debug("query OID %08x value, len %d:\n", OID, buf_len);
182 		for (i = 0; i < buf_len; i += 16) {
183 			pr_debug("%03d: %08x %08x %08x %08x\n", i,
184 				get_unaligned_le32(&buf[i]),
185 				get_unaligned_le32(&buf[i + 4]),
186 				get_unaligned_le32(&buf[i + 8]),
187 				get_unaligned_le32(&buf[i + 12]));
188 		}
189 	}
190 
191 	/* response goes here, right after the header */
192 	outbuf = (__le32 *)&resp[1];
193 	resp->InformationBufferOffset = cpu_to_le32(16);
194 
195 	net = rndis_per_dev_params[configNr].dev;
196 	stats = dev_get_stats(net, &temp);
197 
198 	switch (OID) {
199 
200 	/* general oids (table 4-1) */
201 
202 	/* mandatory */
203 	case OID_GEN_SUPPORTED_LIST:
204 		pr_debug("%s: OID_GEN_SUPPORTED_LIST\n", __func__);
205 		length = sizeof(oid_supported_list);
206 		count  = length / sizeof(u32);
207 		for (i = 0; i < count; i++)
208 			outbuf[i] = cpu_to_le32(oid_supported_list[i]);
209 		retval = 0;
210 		break;
211 
212 	/* mandatory */
213 	case OID_GEN_HARDWARE_STATUS:
214 		pr_debug("%s: OID_GEN_HARDWARE_STATUS\n", __func__);
215 		/* Bogus question!
216 		 * Hardware must be ready to receive high level protocols.
217 		 * BTW:
218 		 * reddite ergo quae sunt Caesaris Caesari
219 		 * et quae sunt Dei Deo!
220 		 */
221 		*outbuf = cpu_to_le32(0);
222 		retval = 0;
223 		break;
224 
225 	/* mandatory */
226 	case OID_GEN_MEDIA_SUPPORTED:
227 		pr_debug("%s: OID_GEN_MEDIA_SUPPORTED\n", __func__);
228 		*outbuf = cpu_to_le32(rndis_per_dev_params[configNr].medium);
229 		retval = 0;
230 		break;
231 
232 	/* mandatory */
233 	case OID_GEN_MEDIA_IN_USE:
234 		pr_debug("%s: OID_GEN_MEDIA_IN_USE\n", __func__);
235 		/* one medium, one transport... (maybe you do it better) */
236 		*outbuf = cpu_to_le32(rndis_per_dev_params[configNr].medium);
237 		retval = 0;
238 		break;
239 
240 	/* mandatory */
241 	case OID_GEN_MAXIMUM_FRAME_SIZE:
242 		pr_debug("%s: OID_GEN_MAXIMUM_FRAME_SIZE\n", __func__);
243 		if (rndis_per_dev_params[configNr].dev) {
244 			*outbuf = cpu_to_le32(
245 				rndis_per_dev_params[configNr].dev->mtu);
246 			retval = 0;
247 		}
248 		break;
249 
250 	/* mandatory */
251 	case OID_GEN_LINK_SPEED:
252 		if (rndis_debug > 1)
253 			pr_debug("%s: OID_GEN_LINK_SPEED\n", __func__);
254 		if (rndis_per_dev_params[configNr].media_state
255 				== NDIS_MEDIA_STATE_DISCONNECTED)
256 			*outbuf = cpu_to_le32(0);
257 		else
258 			*outbuf = cpu_to_le32(
259 				rndis_per_dev_params[configNr].speed);
260 		retval = 0;
261 		break;
262 
263 	/* mandatory */
264 	case OID_GEN_TRANSMIT_BLOCK_SIZE:
265 		pr_debug("%s: OID_GEN_TRANSMIT_BLOCK_SIZE\n", __func__);
266 		if (rndis_per_dev_params[configNr].dev) {
267 			*outbuf = cpu_to_le32(
268 				rndis_per_dev_params[configNr].dev->mtu);
269 			retval = 0;
270 		}
271 		break;
272 
273 	/* mandatory */
274 	case OID_GEN_RECEIVE_BLOCK_SIZE:
275 		pr_debug("%s: OID_GEN_RECEIVE_BLOCK_SIZE\n", __func__);
276 		if (rndis_per_dev_params[configNr].dev) {
277 			*outbuf = cpu_to_le32(
278 				rndis_per_dev_params[configNr].dev->mtu);
279 			retval = 0;
280 		}
281 		break;
282 
283 	/* mandatory */
284 	case OID_GEN_VENDOR_ID:
285 		pr_debug("%s: OID_GEN_VENDOR_ID\n", __func__);
286 		*outbuf = cpu_to_le32(
287 			rndis_per_dev_params[configNr].vendorID);
288 		retval = 0;
289 		break;
290 
291 	/* mandatory */
292 	case OID_GEN_VENDOR_DESCRIPTION:
293 		pr_debug("%s: OID_GEN_VENDOR_DESCRIPTION\n", __func__);
294 		if (rndis_per_dev_params[configNr].vendorDescr) {
295 			length = strlen(rndis_per_dev_params[configNr].
296 					vendorDescr);
297 			memcpy(outbuf,
298 				rndis_per_dev_params[configNr].vendorDescr,
299 				length);
300 		} else {
301 			outbuf[0] = 0;
302 		}
303 		retval = 0;
304 		break;
305 
306 	case OID_GEN_VENDOR_DRIVER_VERSION:
307 		pr_debug("%s: OID_GEN_VENDOR_DRIVER_VERSION\n", __func__);
308 		/* Created as LE */
309 		*outbuf = rndis_driver_version;
310 		retval = 0;
311 		break;
312 
313 	/* mandatory */
314 	case OID_GEN_CURRENT_PACKET_FILTER:
315 		pr_debug("%s: OID_GEN_CURRENT_PACKET_FILTER\n", __func__);
316 		*outbuf = cpu_to_le32(*rndis_per_dev_params[configNr].filter);
317 		retval = 0;
318 		break;
319 
320 	/* mandatory */
321 	case OID_GEN_MAXIMUM_TOTAL_SIZE:
322 		pr_debug("%s: OID_GEN_MAXIMUM_TOTAL_SIZE\n", __func__);
323 		*outbuf = cpu_to_le32(RNDIS_MAX_TOTAL_SIZE);
324 		retval = 0;
325 		break;
326 
327 	/* mandatory */
328 	case OID_GEN_MEDIA_CONNECT_STATUS:
329 		if (rndis_debug > 1)
330 			pr_debug("%s: OID_GEN_MEDIA_CONNECT_STATUS\n", __func__);
331 		*outbuf = cpu_to_le32(rndis_per_dev_params[configNr]
332 						.media_state);
333 		retval = 0;
334 		break;
335 
336 	case OID_GEN_PHYSICAL_MEDIUM:
337 		pr_debug("%s: OID_GEN_PHYSICAL_MEDIUM\n", __func__);
338 		*outbuf = cpu_to_le32(0);
339 		retval = 0;
340 		break;
341 
342 	/* The RNDIS specification is incomplete/wrong.   Some versions
343 	 * of MS-Windows expect OIDs that aren't specified there.  Other
344 	 * versions emit undefined RNDIS messages. DOCUMENT ALL THESE!
345 	 */
346 	case OID_GEN_MAC_OPTIONS:		/* from WinME */
347 		pr_debug("%s: OID_GEN_MAC_OPTIONS\n", __func__);
348 		*outbuf = cpu_to_le32(
349 			  NDIS_MAC_OPTION_RECEIVE_SERIALIZED
350 			| NDIS_MAC_OPTION_FULL_DUPLEX);
351 		retval = 0;
352 		break;
353 
354 	/* statistics OIDs (table 4-2) */
355 
356 	/* mandatory */
357 	case OID_GEN_XMIT_OK:
358 		if (rndis_debug > 1)
359 			pr_debug("%s: OID_GEN_XMIT_OK\n", __func__);
360 		if (stats) {
361 			*outbuf = cpu_to_le32(stats->tx_packets
362 				- stats->tx_errors - stats->tx_dropped);
363 			retval = 0;
364 		}
365 		break;
366 
367 	/* mandatory */
368 	case OID_GEN_RCV_OK:
369 		if (rndis_debug > 1)
370 			pr_debug("%s: OID_GEN_RCV_OK\n", __func__);
371 		if (stats) {
372 			*outbuf = cpu_to_le32(stats->rx_packets
373 				- stats->rx_errors - stats->rx_dropped);
374 			retval = 0;
375 		}
376 		break;
377 
378 	/* mandatory */
379 	case OID_GEN_XMIT_ERROR:
380 		if (rndis_debug > 1)
381 			pr_debug("%s: OID_GEN_XMIT_ERROR\n", __func__);
382 		if (stats) {
383 			*outbuf = cpu_to_le32(stats->tx_errors);
384 			retval = 0;
385 		}
386 		break;
387 
388 	/* mandatory */
389 	case OID_GEN_RCV_ERROR:
390 		if (rndis_debug > 1)
391 			pr_debug("%s: OID_GEN_RCV_ERROR\n", __func__);
392 		if (stats) {
393 			*outbuf = cpu_to_le32(stats->rx_errors);
394 			retval = 0;
395 		}
396 		break;
397 
398 	/* mandatory */
399 	case OID_GEN_RCV_NO_BUFFER:
400 		pr_debug("%s: OID_GEN_RCV_NO_BUFFER\n", __func__);
401 		if (stats) {
402 			*outbuf = cpu_to_le32(stats->rx_dropped);
403 			retval = 0;
404 		}
405 		break;
406 
407 	/* ieee802.3 OIDs (table 4-3) */
408 
409 	/* mandatory */
410 	case OID_802_3_PERMANENT_ADDRESS:
411 		pr_debug("%s: OID_802_3_PERMANENT_ADDRESS\n", __func__);
412 		if (rndis_per_dev_params[configNr].dev) {
413 			length = ETH_ALEN;
414 			memcpy(outbuf,
415 				rndis_per_dev_params[configNr].host_mac,
416 				length);
417 			retval = 0;
418 		}
419 		break;
420 
421 	/* mandatory */
422 	case OID_802_3_CURRENT_ADDRESS:
423 		pr_debug("%s: OID_802_3_CURRENT_ADDRESS\n", __func__);
424 		if (rndis_per_dev_params[configNr].dev) {
425 			length = ETH_ALEN;
426 			memcpy(outbuf,
427 				rndis_per_dev_params [configNr].host_mac,
428 				length);
429 			retval = 0;
430 		}
431 		break;
432 
433 	/* mandatory */
434 	case OID_802_3_MULTICAST_LIST:
435 		pr_debug("%s: OID_802_3_MULTICAST_LIST\n", __func__);
436 		/* Multicast base address only */
437 		*outbuf = cpu_to_le32(0xE0000000);
438 		retval = 0;
439 		break;
440 
441 	/* mandatory */
442 	case OID_802_3_MAXIMUM_LIST_SIZE:
443 		pr_debug("%s: OID_802_3_MAXIMUM_LIST_SIZE\n", __func__);
444 		/* Multicast base address only */
445 		*outbuf = cpu_to_le32(1);
446 		retval = 0;
447 		break;
448 
449 	case OID_802_3_MAC_OPTIONS:
450 		pr_debug("%s: OID_802_3_MAC_OPTIONS\n", __func__);
451 		*outbuf = cpu_to_le32(0);
452 		retval = 0;
453 		break;
454 
455 	/* ieee802.3 statistics OIDs (table 4-4) */
456 
457 	/* mandatory */
458 	case OID_802_3_RCV_ERROR_ALIGNMENT:
459 		pr_debug("%s: OID_802_3_RCV_ERROR_ALIGNMENT\n", __func__);
460 		if (stats) {
461 			*outbuf = cpu_to_le32(stats->rx_frame_errors);
462 			retval = 0;
463 		}
464 		break;
465 
466 	/* mandatory */
467 	case OID_802_3_XMIT_ONE_COLLISION:
468 		pr_debug("%s: OID_802_3_XMIT_ONE_COLLISION\n", __func__);
469 		*outbuf = cpu_to_le32(0);
470 		retval = 0;
471 		break;
472 
473 	/* mandatory */
474 	case OID_802_3_XMIT_MORE_COLLISIONS:
475 		pr_debug("%s: OID_802_3_XMIT_MORE_COLLISIONS\n", __func__);
476 		*outbuf = cpu_to_le32(0);
477 		retval = 0;
478 		break;
479 
480 	default:
481 		pr_warning("%s: query unknown OID 0x%08X\n",
482 			 __func__, OID);
483 	}
484 	if (retval < 0)
485 		length = 0;
486 
487 	resp->InformationBufferLength = cpu_to_le32(length);
488 	r->length = length + sizeof(*resp);
489 	resp->MessageLength = cpu_to_le32(r->length);
490 	return retval;
491 }
492 
gen_ndis_set_resp(u8 configNr,u32 OID,u8 * buf,u32 buf_len,rndis_resp_t * r)493 static int gen_ndis_set_resp(u8 configNr, u32 OID, u8 *buf, u32 buf_len,
494 			     rndis_resp_t *r)
495 {
496 	rndis_set_cmplt_type *resp;
497 	int i, retval = -ENOTSUPP;
498 	struct rndis_params *params;
499 
500 	if (!r)
501 		return -ENOMEM;
502 	resp = (rndis_set_cmplt_type *)r->buf;
503 	if (!resp)
504 		return -ENOMEM;
505 
506 	if (buf_len && rndis_debug > 1) {
507 		pr_debug("set OID %08x value, len %d:\n", OID, buf_len);
508 		for (i = 0; i < buf_len; i += 16) {
509 			pr_debug("%03d: %08x %08x %08x %08x\n", i,
510 				get_unaligned_le32(&buf[i]),
511 				get_unaligned_le32(&buf[i + 4]),
512 				get_unaligned_le32(&buf[i + 8]),
513 				get_unaligned_le32(&buf[i + 12]));
514 		}
515 	}
516 
517 	params = &rndis_per_dev_params[configNr];
518 	switch (OID) {
519 	case OID_GEN_CURRENT_PACKET_FILTER:
520 
521 		/* these NDIS_PACKET_TYPE_* bitflags are shared with
522 		 * cdc_filter; it's not RNDIS-specific
523 		 * NDIS_PACKET_TYPE_x == USB_CDC_PACKET_TYPE_x for x in:
524 		 *	PROMISCUOUS, DIRECTED,
525 		 *	MULTICAST, ALL_MULTICAST, BROADCAST
526 		 */
527 		*params->filter = (u16)get_unaligned_le32(buf);
528 		pr_debug("%s: OID_GEN_CURRENT_PACKET_FILTER %08x\n",
529 			__func__, *params->filter);
530 
531 		/* this call has a significant side effect:  it's
532 		 * what makes the packet flow start and stop, like
533 		 * activating the CDC Ethernet altsetting.
534 		 */
535 		retval = 0;
536 		if (*params->filter) {
537 			params->state = RNDIS_DATA_INITIALIZED;
538 			netif_carrier_on(params->dev);
539 			if (netif_running(params->dev))
540 				netif_wake_queue(params->dev);
541 		} else {
542 			params->state = RNDIS_INITIALIZED;
543 			netif_carrier_off(params->dev);
544 			netif_stop_queue(params->dev);
545 		}
546 		break;
547 
548 	case OID_802_3_MULTICAST_LIST:
549 		/* I think we can ignore this */
550 		pr_debug("%s: OID_802_3_MULTICAST_LIST\n", __func__);
551 		retval = 0;
552 		break;
553 
554 	default:
555 		pr_warning("%s: set unknown OID 0x%08X, size %d\n",
556 			 __func__, OID, buf_len);
557 	}
558 
559 	return retval;
560 }
561 
562 /*
563  * Response Functions
564  */
565 
rndis_init_response(int configNr,rndis_init_msg_type * buf)566 static int rndis_init_response(int configNr, rndis_init_msg_type *buf)
567 {
568 	rndis_init_cmplt_type *resp;
569 	rndis_resp_t *r;
570 	struct rndis_params *params = rndis_per_dev_params + configNr;
571 
572 	if (!params->dev)
573 		return -ENOTSUPP;
574 
575 	r = rndis_add_response(configNr, sizeof(rndis_init_cmplt_type));
576 	if (!r)
577 		return -ENOMEM;
578 	resp = (rndis_init_cmplt_type *)r->buf;
579 
580 	resp->MessageType = cpu_to_le32(REMOTE_NDIS_INITIALIZE_CMPLT);
581 	resp->MessageLength = cpu_to_le32(52);
582 	resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
583 	resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
584 	resp->MajorVersion = cpu_to_le32(RNDIS_MAJOR_VERSION);
585 	resp->MinorVersion = cpu_to_le32(RNDIS_MINOR_VERSION);
586 	resp->DeviceFlags = cpu_to_le32(RNDIS_DF_CONNECTIONLESS);
587 	resp->Medium = cpu_to_le32(RNDIS_MEDIUM_802_3);
588 	resp->MaxPacketsPerTransfer = cpu_to_le32(1);
589 	resp->MaxTransferSize = cpu_to_le32(
590 		  params->dev->mtu
591 		+ sizeof(struct ethhdr)
592 		+ sizeof(struct rndis_packet_msg_type)
593 		+ 22);
594 	resp->PacketAlignmentFactor = cpu_to_le32(0);
595 	resp->AFListOffset = cpu_to_le32(0);
596 	resp->AFListSize = cpu_to_le32(0);
597 
598 	params->resp_avail(params->v);
599 	return 0;
600 }
601 
rndis_query_response(int configNr,rndis_query_msg_type * buf)602 static int rndis_query_response(int configNr, rndis_query_msg_type *buf)
603 {
604 	rndis_query_cmplt_type *resp;
605 	rndis_resp_t *r;
606 	struct rndis_params *params = rndis_per_dev_params + configNr;
607 
608 	/* pr_debug("%s: OID = %08X\n", __func__, cpu_to_le32(buf->OID)); */
609 	if (!params->dev)
610 		return -ENOTSUPP;
611 
612 	/*
613 	 * we need more memory:
614 	 * gen_ndis_query_resp expects enough space for
615 	 * rndis_query_cmplt_type followed by data.
616 	 * oid_supported_list is the largest data reply
617 	 */
618 	r = rndis_add_response(configNr,
619 		sizeof(oid_supported_list) + sizeof(rndis_query_cmplt_type));
620 	if (!r)
621 		return -ENOMEM;
622 	resp = (rndis_query_cmplt_type *)r->buf;
623 
624 	resp->MessageType = cpu_to_le32(REMOTE_NDIS_QUERY_CMPLT);
625 	resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
626 
627 	if (gen_ndis_query_resp(configNr, le32_to_cpu(buf->OID),
628 			le32_to_cpu(buf->InformationBufferOffset)
629 					+ 8 + (u8 *)buf,
630 			le32_to_cpu(buf->InformationBufferLength),
631 			r)) {
632 		/* OID not supported */
633 		resp->Status = cpu_to_le32(RNDIS_STATUS_NOT_SUPPORTED);
634 		resp->MessageLength = cpu_to_le32(sizeof *resp);
635 		resp->InformationBufferLength = cpu_to_le32(0);
636 		resp->InformationBufferOffset = cpu_to_le32(0);
637 	} else
638 		resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
639 
640 	params->resp_avail(params->v);
641 	return 0;
642 }
643 
rndis_set_response(int configNr,rndis_set_msg_type * buf)644 static int rndis_set_response(int configNr, rndis_set_msg_type *buf)
645 {
646 	u32 BufLength, BufOffset;
647 	rndis_set_cmplt_type *resp;
648 	rndis_resp_t *r;
649 	struct rndis_params *params = rndis_per_dev_params + configNr;
650 
651 	r = rndis_add_response(configNr, sizeof(rndis_set_cmplt_type));
652 	if (!r)
653 		return -ENOMEM;
654 	resp = (rndis_set_cmplt_type *)r->buf;
655 
656 	BufLength = le32_to_cpu(buf->InformationBufferLength);
657 	BufOffset = le32_to_cpu(buf->InformationBufferOffset);
658 
659 #ifdef	VERBOSE_DEBUG
660 	pr_debug("%s: Length: %d\n", __func__, BufLength);
661 	pr_debug("%s: Offset: %d\n", __func__, BufOffset);
662 	pr_debug("%s: InfoBuffer: ", __func__);
663 
664 	for (i = 0; i < BufLength; i++) {
665 		pr_debug("%02x ", *(((u8 *) buf) + i + 8 + BufOffset));
666 	}
667 
668 	pr_debug("\n");
669 #endif
670 
671 	resp->MessageType = cpu_to_le32(REMOTE_NDIS_SET_CMPLT);
672 	resp->MessageLength = cpu_to_le32(16);
673 	resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
674 	if (gen_ndis_set_resp(configNr, le32_to_cpu(buf->OID),
675 			((u8 *)buf) + 8 + BufOffset, BufLength, r))
676 		resp->Status = cpu_to_le32(RNDIS_STATUS_NOT_SUPPORTED);
677 	else
678 		resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
679 
680 	params->resp_avail(params->v);
681 	return 0;
682 }
683 
rndis_reset_response(int configNr,rndis_reset_msg_type * buf)684 static int rndis_reset_response(int configNr, rndis_reset_msg_type *buf)
685 {
686 	rndis_reset_cmplt_type *resp;
687 	rndis_resp_t *r;
688 	struct rndis_params *params = rndis_per_dev_params + configNr;
689 
690 	r = rndis_add_response(configNr, sizeof(rndis_reset_cmplt_type));
691 	if (!r)
692 		return -ENOMEM;
693 	resp = (rndis_reset_cmplt_type *)r->buf;
694 
695 	resp->MessageType = cpu_to_le32(REMOTE_NDIS_RESET_CMPLT);
696 	resp->MessageLength = cpu_to_le32(16);
697 	resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
698 	/* resent information */
699 	resp->AddressingReset = cpu_to_le32(1);
700 
701 	params->resp_avail(params->v);
702 	return 0;
703 }
704 
rndis_keepalive_response(int configNr,rndis_keepalive_msg_type * buf)705 static int rndis_keepalive_response(int configNr,
706 				    rndis_keepalive_msg_type *buf)
707 {
708 	rndis_keepalive_cmplt_type *resp;
709 	rndis_resp_t *r;
710 	struct rndis_params *params = rndis_per_dev_params + configNr;
711 
712 	/* host "should" check only in RNDIS_DATA_INITIALIZED state */
713 
714 	r = rndis_add_response(configNr, sizeof(rndis_keepalive_cmplt_type));
715 	if (!r)
716 		return -ENOMEM;
717 	resp = (rndis_keepalive_cmplt_type *)r->buf;
718 
719 	resp->MessageType = cpu_to_le32(
720 			REMOTE_NDIS_KEEPALIVE_CMPLT);
721 	resp->MessageLength = cpu_to_le32(16);
722 	resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
723 	resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
724 
725 	params->resp_avail(params->v);
726 	return 0;
727 }
728 
729 
730 /*
731  * Device to Host Comunication
732  */
rndis_indicate_status_msg(int configNr,u32 status)733 static int rndis_indicate_status_msg(int configNr, u32 status)
734 {
735 	rndis_indicate_status_msg_type *resp;
736 	rndis_resp_t *r;
737 	struct rndis_params *params = rndis_per_dev_params + configNr;
738 
739 	if (params->state == RNDIS_UNINITIALIZED)
740 		return -ENOTSUPP;
741 
742 	r = rndis_add_response(configNr,
743 				sizeof(rndis_indicate_status_msg_type));
744 	if (!r)
745 		return -ENOMEM;
746 	resp = (rndis_indicate_status_msg_type *)r->buf;
747 
748 	resp->MessageType = cpu_to_le32(REMOTE_NDIS_INDICATE_STATUS_MSG);
749 	resp->MessageLength = cpu_to_le32(20);
750 	resp->Status = cpu_to_le32(status);
751 	resp->StatusBufferLength = cpu_to_le32(0);
752 	resp->StatusBufferOffset = cpu_to_le32(0);
753 
754 	params->resp_avail(params->v);
755 	return 0;
756 }
757 
rndis_signal_connect(int configNr)758 int rndis_signal_connect(int configNr)
759 {
760 	rndis_per_dev_params[configNr].media_state
761 			= NDIS_MEDIA_STATE_CONNECTED;
762 	return rndis_indicate_status_msg(configNr,
763 					  RNDIS_STATUS_MEDIA_CONNECT);
764 }
765 
rndis_signal_disconnect(int configNr)766 int rndis_signal_disconnect(int configNr)
767 {
768 	rndis_per_dev_params[configNr].media_state
769 			= NDIS_MEDIA_STATE_DISCONNECTED;
770 	return rndis_indicate_status_msg(configNr,
771 					  RNDIS_STATUS_MEDIA_DISCONNECT);
772 }
773 
rndis_uninit(int configNr)774 void rndis_uninit(int configNr)
775 {
776 	u8 *buf;
777 	u32 length;
778 
779 	if (configNr >= RNDIS_MAX_CONFIGS)
780 		return;
781 	rndis_per_dev_params[configNr].state = RNDIS_UNINITIALIZED;
782 
783 	/* drain the response queue */
784 	while ((buf = rndis_get_next_response(configNr, &length)))
785 		rndis_free_response(configNr, buf);
786 }
787 
rndis_set_host_mac(int configNr,const u8 * addr)788 void rndis_set_host_mac(int configNr, const u8 *addr)
789 {
790 	rndis_per_dev_params[configNr].host_mac = addr;
791 }
792 
793 /*
794  * Message Parser
795  */
rndis_msg_parser(u8 configNr,u8 * buf)796 int rndis_msg_parser(u8 configNr, u8 *buf)
797 {
798 	u32 MsgType, MsgLength;
799 	__le32 *tmp;
800 	struct rndis_params *params;
801 
802 	if (!buf)
803 		return -ENOMEM;
804 
805 	tmp = (__le32 *)buf;
806 	MsgType   = get_unaligned_le32(tmp++);
807 	MsgLength = get_unaligned_le32(tmp++);
808 
809 	if (configNr >= RNDIS_MAX_CONFIGS)
810 		return -ENOTSUPP;
811 	params = &rndis_per_dev_params[configNr];
812 
813 	/* NOTE: RNDIS is *EXTREMELY* chatty ... Windows constantly polls for
814 	 * rx/tx statistics and link status, in addition to KEEPALIVE traffic
815 	 * and normal HC level polling to see if there's any IN traffic.
816 	 */
817 
818 	/* For USB: responses may take up to 10 seconds */
819 	switch (MsgType) {
820 	case REMOTE_NDIS_INITIALIZE_MSG:
821 		pr_debug("%s: REMOTE_NDIS_INITIALIZE_MSG\n",
822 			__func__);
823 		params->state = RNDIS_INITIALIZED;
824 		return rndis_init_response(configNr,
825 					(rndis_init_msg_type *)buf);
826 
827 	case REMOTE_NDIS_HALT_MSG:
828 		pr_debug("%s: REMOTE_NDIS_HALT_MSG\n",
829 			__func__);
830 		params->state = RNDIS_UNINITIALIZED;
831 		if (params->dev) {
832 			netif_carrier_off(params->dev);
833 			netif_stop_queue(params->dev);
834 		}
835 		return 0;
836 
837 	case REMOTE_NDIS_QUERY_MSG:
838 		return rndis_query_response(configNr,
839 					(rndis_query_msg_type *)buf);
840 
841 	case REMOTE_NDIS_SET_MSG:
842 		return rndis_set_response(configNr,
843 					(rndis_set_msg_type *)buf);
844 
845 	case REMOTE_NDIS_RESET_MSG:
846 		pr_debug("%s: REMOTE_NDIS_RESET_MSG\n",
847 			__func__);
848 		return rndis_reset_response(configNr,
849 					(rndis_reset_msg_type *)buf);
850 
851 	case REMOTE_NDIS_KEEPALIVE_MSG:
852 		/* For USB: host does this every 5 seconds */
853 		if (rndis_debug > 1)
854 			pr_debug("%s: REMOTE_NDIS_KEEPALIVE_MSG\n",
855 				__func__);
856 		return rndis_keepalive_response(configNr,
857 						 (rndis_keepalive_msg_type *)
858 						 buf);
859 
860 	default:
861 		/* At least Windows XP emits some undefined RNDIS messages.
862 		 * In one case those messages seemed to relate to the host
863 		 * suspending itself.
864 		 */
865 		pr_warning("%s: unknown RNDIS message 0x%08X len %d\n",
866 			__func__, MsgType, MsgLength);
867 		{
868 			unsigned i;
869 			for (i = 0; i < MsgLength; i += 16) {
870 				pr_debug("%03d: "
871 					" %02x %02x %02x %02x"
872 					" %02x %02x %02x %02x"
873 					" %02x %02x %02x %02x"
874 					" %02x %02x %02x %02x"
875 					"\n",
876 					i,
877 					buf[i], buf [i+1],
878 						buf[i+2], buf[i+3],
879 					buf[i+4], buf [i+5],
880 						buf[i+6], buf[i+7],
881 					buf[i+8], buf [i+9],
882 						buf[i+10], buf[i+11],
883 					buf[i+12], buf [i+13],
884 						buf[i+14], buf[i+15]);
885 			}
886 		}
887 		break;
888 	}
889 
890 	return -ENOTSUPP;
891 }
892 
rndis_register(void (* resp_avail)(void * v),void * v)893 int rndis_register(void (*resp_avail)(void *v), void *v)
894 {
895 	u8 i;
896 
897 	if (!resp_avail)
898 		return -EINVAL;
899 
900 	for (i = 0; i < RNDIS_MAX_CONFIGS; i++) {
901 		if (!rndis_per_dev_params[i].used) {
902 			rndis_per_dev_params[i].used = 1;
903 			rndis_per_dev_params[i].resp_avail = resp_avail;
904 			rndis_per_dev_params[i].v = v;
905 			pr_debug("%s: configNr = %d\n", __func__, i);
906 			return i;
907 		}
908 	}
909 	pr_debug("failed\n");
910 
911 	return -ENODEV;
912 }
913 
rndis_deregister(int configNr)914 void rndis_deregister(int configNr)
915 {
916 	pr_debug("%s:\n", __func__);
917 
918 	if (configNr >= RNDIS_MAX_CONFIGS) return;
919 	rndis_per_dev_params[configNr].used = 0;
920 }
921 
rndis_set_param_dev(u8 configNr,struct net_device * dev,u16 * cdc_filter)922 int rndis_set_param_dev(u8 configNr, struct net_device *dev, u16 *cdc_filter)
923 {
924 	pr_debug("%s:\n", __func__);
925 	if (!dev)
926 		return -EINVAL;
927 	if (configNr >= RNDIS_MAX_CONFIGS) return -1;
928 
929 	rndis_per_dev_params[configNr].dev = dev;
930 	rndis_per_dev_params[configNr].filter = cdc_filter;
931 
932 	return 0;
933 }
934 
rndis_set_param_vendor(u8 configNr,u32 vendorID,const char * vendorDescr)935 int rndis_set_param_vendor(u8 configNr, u32 vendorID, const char *vendorDescr)
936 {
937 	pr_debug("%s:\n", __func__);
938 	if (!vendorDescr) return -1;
939 	if (configNr >= RNDIS_MAX_CONFIGS) return -1;
940 
941 	rndis_per_dev_params[configNr].vendorID = vendorID;
942 	rndis_per_dev_params[configNr].vendorDescr = vendorDescr;
943 
944 	return 0;
945 }
946 
rndis_set_param_medium(u8 configNr,u32 medium,u32 speed)947 int rndis_set_param_medium(u8 configNr, u32 medium, u32 speed)
948 {
949 	pr_debug("%s: %u %u\n", __func__, medium, speed);
950 	if (configNr >= RNDIS_MAX_CONFIGS) return -1;
951 
952 	rndis_per_dev_params[configNr].medium = medium;
953 	rndis_per_dev_params[configNr].speed = speed;
954 
955 	return 0;
956 }
957 
rndis_add_hdr(struct sk_buff * skb)958 void rndis_add_hdr(struct sk_buff *skb)
959 {
960 	struct rndis_packet_msg_type *header;
961 
962 	if (!skb)
963 		return;
964 	header = (void *)skb_push(skb, sizeof(*header));
965 	memset(header, 0, sizeof *header);
966 	header->MessageType = cpu_to_le32(REMOTE_NDIS_PACKET_MSG);
967 	header->MessageLength = cpu_to_le32(skb->len);
968 	header->DataOffset = cpu_to_le32(36);
969 	header->DataLength = cpu_to_le32(skb->len - sizeof(*header));
970 }
971 
rndis_free_response(int configNr,u8 * buf)972 void rndis_free_response(int configNr, u8 *buf)
973 {
974 	rndis_resp_t *r;
975 	struct list_head *act, *tmp;
976 
977 	list_for_each_safe(act, tmp,
978 			&(rndis_per_dev_params[configNr].resp_queue))
979 	{
980 		r = list_entry(act, rndis_resp_t, list);
981 		if (r && r->buf == buf) {
982 			list_del(&r->list);
983 			kfree(r);
984 		}
985 	}
986 }
987 
rndis_get_next_response(int configNr,u32 * length)988 u8 *rndis_get_next_response(int configNr, u32 *length)
989 {
990 	rndis_resp_t *r;
991 	struct list_head *act, *tmp;
992 
993 	if (!length) return NULL;
994 
995 	list_for_each_safe(act, tmp,
996 			&(rndis_per_dev_params[configNr].resp_queue))
997 	{
998 		r = list_entry(act, rndis_resp_t, list);
999 		if (!r->send) {
1000 			r->send = 1;
1001 			*length = r->length;
1002 			return r->buf;
1003 		}
1004 	}
1005 
1006 	return NULL;
1007 }
1008 
rndis_add_response(int configNr,u32 length)1009 static rndis_resp_t *rndis_add_response(int configNr, u32 length)
1010 {
1011 	rndis_resp_t *r;
1012 
1013 	/* NOTE: this gets copied into ether.c USB_BUFSIZ bytes ... */
1014 	r = kmalloc(sizeof(rndis_resp_t) + length, GFP_ATOMIC);
1015 	if (!r) return NULL;
1016 
1017 	r->buf = (u8 *)(r + 1);
1018 	r->length = length;
1019 	r->send = 0;
1020 
1021 	list_add_tail(&r->list,
1022 		&(rndis_per_dev_params[configNr].resp_queue));
1023 	return r;
1024 }
1025 
rndis_rm_hdr(struct gether * port,struct sk_buff * skb,struct sk_buff_head * list)1026 int rndis_rm_hdr(struct gether *port,
1027 			struct sk_buff *skb,
1028 			struct sk_buff_head *list)
1029 {
1030 	/* tmp points to a struct rndis_packet_msg_type */
1031 	__le32 *tmp = (void *)skb->data;
1032 
1033 	/* MessageType, MessageLength */
1034 	if (cpu_to_le32(REMOTE_NDIS_PACKET_MSG)
1035 			!= get_unaligned(tmp++)) {
1036 		dev_kfree_skb_any(skb);
1037 		return -EINVAL;
1038 	}
1039 	tmp++;
1040 
1041 	/* DataOffset, DataLength */
1042 	if (!skb_pull(skb, get_unaligned_le32(tmp++) + 8)) {
1043 		dev_kfree_skb_any(skb);
1044 		return -EOVERFLOW;
1045 	}
1046 	skb_trim(skb, get_unaligned_le32(tmp++));
1047 
1048 	skb_queue_tail(list, skb);
1049 	return 0;
1050 }
1051 
1052 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1053 
rndis_proc_show(struct seq_file * m,void * v)1054 static int rndis_proc_show(struct seq_file *m, void *v)
1055 {
1056 	rndis_params *param = m->private;
1057 
1058 	seq_printf(m,
1059 			 "Config Nr. %d\n"
1060 			 "used      : %s\n"
1061 			 "state     : %s\n"
1062 			 "medium    : 0x%08X\n"
1063 			 "speed     : %d\n"
1064 			 "cable     : %s\n"
1065 			 "vendor ID : 0x%08X\n"
1066 			 "vendor    : %s\n",
1067 			 param->confignr, (param->used) ? "y" : "n",
1068 			 ({ char *s = "?";
1069 			 switch (param->state) {
1070 			 case RNDIS_UNINITIALIZED:
1071 				s = "RNDIS_UNINITIALIZED"; break;
1072 			 case RNDIS_INITIALIZED:
1073 				s = "RNDIS_INITIALIZED"; break;
1074 			 case RNDIS_DATA_INITIALIZED:
1075 				s = "RNDIS_DATA_INITIALIZED"; break;
1076 			}; s; }),
1077 			 param->medium,
1078 			 (param->media_state) ? 0 : param->speed*100,
1079 			 (param->media_state) ? "disconnected" : "connected",
1080 			 param->vendorID, param->vendorDescr);
1081 	return 0;
1082 }
1083 
rndis_proc_write(struct file * file,const char __user * buffer,size_t count,loff_t * ppos)1084 static ssize_t rndis_proc_write(struct file *file, const char __user *buffer,
1085 				size_t count, loff_t *ppos)
1086 {
1087 	rndis_params *p = PDE(file->f_path.dentry->d_inode)->data;
1088 	u32 speed = 0;
1089 	int i, fl_speed = 0;
1090 
1091 	for (i = 0; i < count; i++) {
1092 		char c;
1093 		if (get_user(c, buffer))
1094 			return -EFAULT;
1095 		switch (c) {
1096 		case '0':
1097 		case '1':
1098 		case '2':
1099 		case '3':
1100 		case '4':
1101 		case '5':
1102 		case '6':
1103 		case '7':
1104 		case '8':
1105 		case '9':
1106 			fl_speed = 1;
1107 			speed = speed * 10 + c - '0';
1108 			break;
1109 		case 'C':
1110 		case 'c':
1111 			rndis_signal_connect(p->confignr);
1112 			break;
1113 		case 'D':
1114 		case 'd':
1115 			rndis_signal_disconnect(p->confignr);
1116 			break;
1117 		default:
1118 			if (fl_speed) p->speed = speed;
1119 			else pr_debug("%c is not valid\n", c);
1120 			break;
1121 		}
1122 
1123 		buffer++;
1124 	}
1125 
1126 	return count;
1127 }
1128 
rndis_proc_open(struct inode * inode,struct file * file)1129 static int rndis_proc_open(struct inode *inode, struct file *file)
1130 {
1131 	return single_open(file, rndis_proc_show, PDE(inode)->data);
1132 }
1133 
1134 static const struct file_operations rndis_proc_fops = {
1135 	.owner		= THIS_MODULE,
1136 	.open		= rndis_proc_open,
1137 	.read		= seq_read,
1138 	.llseek		= seq_lseek,
1139 	.release	= single_release,
1140 	.write		= rndis_proc_write,
1141 };
1142 
1143 #define	NAME_TEMPLATE "driver/rndis-%03d"
1144 
1145 static struct proc_dir_entry *rndis_connect_state [RNDIS_MAX_CONFIGS];
1146 
1147 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
1148 
1149 
rndis_init(void)1150 int rndis_init(void)
1151 {
1152 	u8 i;
1153 
1154 	for (i = 0; i < RNDIS_MAX_CONFIGS; i++) {
1155 #ifdef	CONFIG_USB_GADGET_DEBUG_FILES
1156 		char name [20];
1157 
1158 		sprintf(name, NAME_TEMPLATE, i);
1159 		rndis_connect_state[i] = proc_create_data(name, 0660, NULL,
1160 					&rndis_proc_fops,
1161 					(void *)(rndis_per_dev_params + i));
1162 		if (!rndis_connect_state[i]) {
1163 			pr_debug("%s: remove entries", __func__);
1164 			while (i) {
1165 				sprintf(name, NAME_TEMPLATE, --i);
1166 				remove_proc_entry(name, NULL);
1167 			}
1168 			pr_debug("\n");
1169 			return -EIO;
1170 		}
1171 #endif
1172 		rndis_per_dev_params[i].confignr = i;
1173 		rndis_per_dev_params[i].used = 0;
1174 		rndis_per_dev_params[i].state = RNDIS_UNINITIALIZED;
1175 		rndis_per_dev_params[i].media_state
1176 				= NDIS_MEDIA_STATE_DISCONNECTED;
1177 		INIT_LIST_HEAD(&(rndis_per_dev_params[i].resp_queue));
1178 	}
1179 
1180 	return 0;
1181 }
1182 
rndis_exit(void)1183 void rndis_exit(void)
1184 {
1185 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1186 	u8 i;
1187 	char name[20];
1188 
1189 	for (i = 0; i < RNDIS_MAX_CONFIGS; i++) {
1190 		sprintf(name, NAME_TEMPLATE, i);
1191 		remove_proc_entry(name, NULL);
1192 	}
1193 #endif
1194 }
1195