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1/*
2 * f_rndis.c -- RNDIS link function driver
3 *
4 * Copyright (C) 2003-2005,2008 David Brownell
5 * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
6 * Copyright (C) 2008 Nokia Corporation
7 * Copyright (C) 2009 Samsung Electronics
8 * Author: Michal Nazarewicz (mina86@mina86.com)
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 */
15
16/* #define VERBOSE_DEBUG */
17
18#include <linux/slab.h>
19#include <linux/kernel.h>
20#include <linux/device.h>
21#include <linux/etherdevice.h>
22
23#include <linux/atomic.h>
24
25#include "u_ether.h"
26#include "rndis.h"
27
28
29/*
30 * This function is an RNDIS Ethernet port -- a Microsoft protocol that's
31 * been promoted instead of the standard CDC Ethernet. The published RNDIS
32 * spec is ambiguous, incomplete, and needlessly complex. Variants such as
33 * ActiveSync have even worse status in terms of specification.
34 *
35 * In short: it's a protocol controlled by (and for) Microsoft, not for an
36 * Open ecosystem or markets. Linux supports it *only* because Microsoft
37 * doesn't support the CDC Ethernet standard.
38 *
39 * The RNDIS data transfer model is complex, with multiple Ethernet packets
40 * per USB message, and out of band data. The control model is built around
41 * what's essentially an "RNDIS RPC" protocol. It's all wrapped in a CDC ACM
42 * (modem, not Ethernet) veneer, with those ACM descriptors being entirely
43 * useless (they're ignored). RNDIS expects to be the only function in its
44 * configuration, so it's no real help if you need composite devices; and
45 * it expects to be the first configuration too.
46 *
47 * There is a single technical advantage of RNDIS over CDC Ethernet, if you
48 * discount the fluff that its RPC can be made to deliver: it doesn't need
49 * a NOP altsetting for the data interface. That lets it work on some of the
50 * "so smart it's stupid" hardware which takes over configuration changes
51 * from the software, and adds restrictions like "no altsettings".
52 *
53 * Unfortunately MSFT's RNDIS drivers are buggy. They hang or oops, and
54 * have all sorts of contrary-to-specification oddities that can prevent
55 * them from working sanely. Since bugfixes (or accurate specs, letting
56 * Linux work around those bugs) are unlikely to ever come from MSFT, you
57 * may want to avoid using RNDIS on purely operational grounds.
58 *
59 * Omissions from the RNDIS 1.0 specification include:
60 *
61 * - Power management ... references data that's scattered around lots
62 * of other documentation, which is incorrect/incomplete there too.
63 *
64 * - There are various undocumented protocol requirements, like the need
65 * to send garbage in some control-OUT messages.
66 *
67 * - MS-Windows drivers sometimes emit undocumented requests.
68 */
69
70struct f_rndis {
71 struct gether port;
72 u8 ctrl_id, data_id;
73 u8 ethaddr[ETH_ALEN];
74 u32 vendorID;
75 const char *manufacturer;
76 int config;
77
78 struct usb_ep *notify;
79 struct usb_request *notify_req;
80 atomic_t notify_count;
81};
82
83static inline struct f_rndis *func_to_rndis(struct usb_function *f)
84{
85 return container_of(f, struct f_rndis, port.func);
86}
87
88/* peak (theoretical) bulk transfer rate in bits-per-second */
89static unsigned int bitrate(struct usb_gadget *g)
90{
91 if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER)
92 return 13 * 1024 * 8 * 1000 * 8;
93 else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
94 return 13 * 512 * 8 * 1000 * 8;
95 else
96 return 19 * 64 * 1 * 1000 * 8;
97}
98
99/*-------------------------------------------------------------------------*/
100
101/*
102 */
103
104#define LOG2_STATUS_INTERVAL_MSEC 5 /* 1 << 5 == 32 msec */
105#define STATUS_BYTECOUNT 8 /* 8 bytes data */
106
107
108/* interface descriptor: */
109
110static struct usb_interface_descriptor rndis_control_intf = {
111 .bLength = sizeof rndis_control_intf,
112 .bDescriptorType = USB_DT_INTERFACE,
113
114 /* .bInterfaceNumber = DYNAMIC */
115 /* status endpoint is optional; this could be patched later */
116 .bNumEndpoints = 1,
117 .bInterfaceClass = USB_CLASS_COMM,
118 .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
119 .bInterfaceProtocol = USB_CDC_ACM_PROTO_VENDOR,
120 /* .iInterface = DYNAMIC */
121};
122
123static struct usb_cdc_header_desc header_desc = {
124 .bLength = sizeof header_desc,
125 .bDescriptorType = USB_DT_CS_INTERFACE,
126 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
127
128 .bcdCDC = cpu_to_le16(0x0110),
129};
130
131static struct usb_cdc_call_mgmt_descriptor call_mgmt_descriptor = {
132 .bLength = sizeof call_mgmt_descriptor,
133 .bDescriptorType = USB_DT_CS_INTERFACE,
134 .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
135
136 .bmCapabilities = 0x00,
137 .bDataInterface = 0x01,
138};
139
140static struct usb_cdc_acm_descriptor rndis_acm_descriptor = {
141 .bLength = sizeof rndis_acm_descriptor,
142 .bDescriptorType = USB_DT_CS_INTERFACE,
143 .bDescriptorSubType = USB_CDC_ACM_TYPE,
144
145 .bmCapabilities = 0x00,
146};
147
148static struct usb_cdc_union_desc rndis_union_desc = {
149 .bLength = sizeof(rndis_union_desc),
150 .bDescriptorType = USB_DT_CS_INTERFACE,
151 .bDescriptorSubType = USB_CDC_UNION_TYPE,
152 /* .bMasterInterface0 = DYNAMIC */
153 /* .bSlaveInterface0 = DYNAMIC */
154};
155
156/* the data interface has two bulk endpoints */
157
158static struct usb_interface_descriptor rndis_data_intf = {
159 .bLength = sizeof rndis_data_intf,
160 .bDescriptorType = USB_DT_INTERFACE,
161
162 /* .bInterfaceNumber = DYNAMIC */
163 .bNumEndpoints = 2,
164 .bInterfaceClass = USB_CLASS_CDC_DATA,
165 .bInterfaceSubClass = 0,
166 .bInterfaceProtocol = 0,
167 /* .iInterface = DYNAMIC */
168};
169
170
171static struct usb_interface_assoc_descriptor
172rndis_iad_descriptor = {
173 .bLength = sizeof rndis_iad_descriptor,
174 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
175
176 .bFirstInterface = 0, /* XXX, hardcoded */
177 .bInterfaceCount = 2, // control + data
178 .bFunctionClass = USB_CLASS_COMM,
179 .bFunctionSubClass = USB_CDC_SUBCLASS_ETHERNET,
180 .bFunctionProtocol = USB_CDC_PROTO_NONE,
181 /* .iFunction = DYNAMIC */
182};
183
184/* full speed support: */
185
186static struct usb_endpoint_descriptor fs_notify_desc = {
187 .bLength = USB_DT_ENDPOINT_SIZE,
188 .bDescriptorType = USB_DT_ENDPOINT,
189
190 .bEndpointAddress = USB_DIR_IN,
191 .bmAttributes = USB_ENDPOINT_XFER_INT,
192 .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT),
193 .bInterval = 1 << LOG2_STATUS_INTERVAL_MSEC,
194};
195
196static struct usb_endpoint_descriptor fs_in_desc = {
197 .bLength = USB_DT_ENDPOINT_SIZE,
198 .bDescriptorType = USB_DT_ENDPOINT,
199
200 .bEndpointAddress = USB_DIR_IN,
201 .bmAttributes = USB_ENDPOINT_XFER_BULK,
202};
203
204static struct usb_endpoint_descriptor fs_out_desc = {
205 .bLength = USB_DT_ENDPOINT_SIZE,
206 .bDescriptorType = USB_DT_ENDPOINT,
207
208 .bEndpointAddress = USB_DIR_OUT,
209 .bmAttributes = USB_ENDPOINT_XFER_BULK,
210};
211
212static struct usb_descriptor_header *eth_fs_function[] = {
213 (struct usb_descriptor_header *) &rndis_iad_descriptor,
214
215 /* control interface matches ACM, not Ethernet */
216 (struct usb_descriptor_header *) &rndis_control_intf,
217 (struct usb_descriptor_header *) &header_desc,
218 (struct usb_descriptor_header *) &call_mgmt_descriptor,
219 (struct usb_descriptor_header *) &rndis_acm_descriptor,
220 (struct usb_descriptor_header *) &rndis_union_desc,
221 (struct usb_descriptor_header *) &fs_notify_desc,
222
223 /* data interface has no altsetting */
224 (struct usb_descriptor_header *) &rndis_data_intf,
225 (struct usb_descriptor_header *) &fs_in_desc,
226 (struct usb_descriptor_header *) &fs_out_desc,
227 NULL,
228};
229
230/* high speed support: */
231
232static struct usb_endpoint_descriptor hs_notify_desc = {
233 .bLength = USB_DT_ENDPOINT_SIZE,
234 .bDescriptorType = USB_DT_ENDPOINT,
235
236 .bEndpointAddress = USB_DIR_IN,
237 .bmAttributes = USB_ENDPOINT_XFER_INT,
238 .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT),
239 .bInterval = LOG2_STATUS_INTERVAL_MSEC + 4,
240};
241
242static struct usb_endpoint_descriptor hs_in_desc = {
243 .bLength = USB_DT_ENDPOINT_SIZE,
244 .bDescriptorType = USB_DT_ENDPOINT,
245
246 .bEndpointAddress = USB_DIR_IN,
247 .bmAttributes = USB_ENDPOINT_XFER_BULK,
248 .wMaxPacketSize = cpu_to_le16(512),
249};
250
251static struct usb_endpoint_descriptor hs_out_desc = {
252 .bLength = USB_DT_ENDPOINT_SIZE,
253 .bDescriptorType = USB_DT_ENDPOINT,
254
255 .bEndpointAddress = USB_DIR_OUT,
256 .bmAttributes = USB_ENDPOINT_XFER_BULK,
257 .wMaxPacketSize = cpu_to_le16(512),
258};
259
260static struct usb_descriptor_header *eth_hs_function[] = {
261 (struct usb_descriptor_header *) &rndis_iad_descriptor,
262
263 /* control interface matches ACM, not Ethernet */
264 (struct usb_descriptor_header *) &rndis_control_intf,
265 (struct usb_descriptor_header *) &header_desc,
266 (struct usb_descriptor_header *) &call_mgmt_descriptor,
267 (struct usb_descriptor_header *) &rndis_acm_descriptor,
268 (struct usb_descriptor_header *) &rndis_union_desc,
269 (struct usb_descriptor_header *) &hs_notify_desc,
270
271 /* data interface has no altsetting */
272 (struct usb_descriptor_header *) &rndis_data_intf,
273 (struct usb_descriptor_header *) &hs_in_desc,
274 (struct usb_descriptor_header *) &hs_out_desc,
275 NULL,
276};
277
278/* super speed support: */
279
280static struct usb_endpoint_descriptor ss_notify_desc = {
281 .bLength = USB_DT_ENDPOINT_SIZE,
282 .bDescriptorType = USB_DT_ENDPOINT,
283
284 .bEndpointAddress = USB_DIR_IN,
285 .bmAttributes = USB_ENDPOINT_XFER_INT,
286 .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT),
287 .bInterval = LOG2_STATUS_INTERVAL_MSEC + 4,
288};
289
290static struct usb_ss_ep_comp_descriptor ss_intr_comp_desc = {
291 .bLength = sizeof ss_intr_comp_desc,
292 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
293
294 /* the following 3 values can be tweaked if necessary */
295 /* .bMaxBurst = 0, */
296 /* .bmAttributes = 0, */
297 .wBytesPerInterval = cpu_to_le16(STATUS_BYTECOUNT),
298};
299
300static struct usb_endpoint_descriptor ss_in_desc = {
301 .bLength = USB_DT_ENDPOINT_SIZE,
302 .bDescriptorType = USB_DT_ENDPOINT,
303
304 .bEndpointAddress = USB_DIR_IN,
305 .bmAttributes = USB_ENDPOINT_XFER_BULK,
306 .wMaxPacketSize = cpu_to_le16(1024),
307};
308
309static struct usb_endpoint_descriptor ss_out_desc = {
310 .bLength = USB_DT_ENDPOINT_SIZE,
311 .bDescriptorType = USB_DT_ENDPOINT,
312
313 .bEndpointAddress = USB_DIR_OUT,
314 .bmAttributes = USB_ENDPOINT_XFER_BULK,
315 .wMaxPacketSize = cpu_to_le16(1024),
316};
317
318static struct usb_ss_ep_comp_descriptor ss_bulk_comp_desc = {
319 .bLength = sizeof ss_bulk_comp_desc,
320 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
321
322 /* the following 2 values can be tweaked if necessary */
323 /* .bMaxBurst = 0, */
324 /* .bmAttributes = 0, */
325};
326
327static struct usb_descriptor_header *eth_ss_function[] = {
328 (struct usb_descriptor_header *) &rndis_iad_descriptor,
329
330 /* control interface matches ACM, not Ethernet */
331 (struct usb_descriptor_header *) &rndis_control_intf,
332 (struct usb_descriptor_header *) &header_desc,
333 (struct usb_descriptor_header *) &call_mgmt_descriptor,
334 (struct usb_descriptor_header *) &rndis_acm_descriptor,
335 (struct usb_descriptor_header *) &rndis_union_desc,
336 (struct usb_descriptor_header *) &ss_notify_desc,
337 (struct usb_descriptor_header *) &ss_intr_comp_desc,
338
339 /* data interface has no altsetting */
340 (struct usb_descriptor_header *) &rndis_data_intf,
341 (struct usb_descriptor_header *) &ss_in_desc,
342 (struct usb_descriptor_header *) &ss_bulk_comp_desc,
343 (struct usb_descriptor_header *) &ss_out_desc,
344 (struct usb_descriptor_header *) &ss_bulk_comp_desc,
345 NULL,
346};
347
348/* string descriptors: */
349
350static struct usb_string rndis_string_defs[] = {
351 [0].s = "RNDIS Communications Control",
352 [1].s = "RNDIS Ethernet Data",
353 [2].s = "RNDIS",
354 { } /* end of list */
355};
356
357static struct usb_gadget_strings rndis_string_table = {
358 .language = 0x0409, /* en-us */
359 .strings = rndis_string_defs,
360};
361
362static struct usb_gadget_strings *rndis_strings[] = {
363 &rndis_string_table,
364 NULL,
365};
366
367/*-------------------------------------------------------------------------*/
368
369static struct sk_buff *rndis_add_header(struct gether *port,
370 struct sk_buff *skb)
371{
372 struct sk_buff *skb2;
373
374 skb2 = skb_realloc_headroom(skb, sizeof(struct rndis_packet_msg_type));
375 if (skb2)
376 rndis_add_hdr(skb2);
377
378 dev_kfree_skb_any(skb);
379 return skb2;
380}
381
382static void rndis_response_available(void *_rndis)
383{
384 struct f_rndis *rndis = _rndis;
385 struct usb_request *req = rndis->notify_req;
386 struct usb_composite_dev *cdev = rndis->port.func.config->cdev;
387 __le32 *data = req->buf;
388 int status;
389
390 if (atomic_inc_return(&rndis->notify_count) != 1)
391 return;
392
393 /* Send RNDIS RESPONSE_AVAILABLE notification; a
394 * USB_CDC_NOTIFY_RESPONSE_AVAILABLE "should" work too
395 *
396 * This is the only notification defined by RNDIS.
397 */
398 data[0] = cpu_to_le32(1);
399 data[1] = cpu_to_le32(0);
400
401 status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC);
402 if (status) {
403 atomic_dec(&rndis->notify_count);
404 DBG(cdev, "notify/0 --> %d\n", status);
405 }
406}
407
408static void rndis_response_complete(struct usb_ep *ep, struct usb_request *req)
409{
410 struct f_rndis *rndis = req->context;
411 struct usb_composite_dev *cdev = rndis->port.func.config->cdev;
412 int status = req->status;
413
414 /* after TX:
415 * - USB_CDC_GET_ENCAPSULATED_RESPONSE (ep0/control)
416 * - RNDIS_RESPONSE_AVAILABLE (status/irq)
417 */
418 switch (status) {
419 case -ECONNRESET:
420 case -ESHUTDOWN:
421 /* connection gone */
422 atomic_set(&rndis->notify_count, 0);
423 break;
424 default:
425 DBG(cdev, "RNDIS %s response error %d, %d/%d\n",
426 ep->name, status,
427 req->actual, req->length);
428 /* FALLTHROUGH */
429 case 0:
430 if (ep != rndis->notify)
431 break;
432
433 /* handle multiple pending RNDIS_RESPONSE_AVAILABLE
434 * notifications by resending until we're done
435 */
436 if (atomic_dec_and_test(&rndis->notify_count))
437 break;
438 status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC);
439 if (status) {
440 atomic_dec(&rndis->notify_count);
441 DBG(cdev, "notify/1 --> %d\n", status);
442 }
443 break;
444 }
445}
446
447static void rndis_command_complete(struct usb_ep *ep, struct usb_request *req)
448{
449 struct f_rndis *rndis = req->context;
450 struct usb_composite_dev *cdev = rndis->port.func.config->cdev;
451 int status;
452
453 /* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */
454// spin_lock(&dev->lock);
455 status = rndis_msg_parser(rndis->config, (u8 *) req->buf);
456 if (status < 0)
457 ERROR(cdev, "RNDIS command error %d, %d/%d\n",
458 status, req->actual, req->length);
459// spin_unlock(&dev->lock);
460}
461
462static int
463rndis_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
464{
465 struct f_rndis *rndis = func_to_rndis(f);
466 struct usb_composite_dev *cdev = f->config->cdev;
467 struct usb_request *req = cdev->req;
468 int value = -EOPNOTSUPP;
469 u16 w_index = le16_to_cpu(ctrl->wIndex);
470 u16 w_value = le16_to_cpu(ctrl->wValue);
471 u16 w_length = le16_to_cpu(ctrl->wLength);
472
473 /* composite driver infrastructure handles everything except
474 * CDC class messages; interface activation uses set_alt().
475 */
476 switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
477
478 /* RNDIS uses the CDC command encapsulation mechanism to implement
479 * an RPC scheme, with much getting/setting of attributes by OID.
480 */
481 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
482 | USB_CDC_SEND_ENCAPSULATED_COMMAND:
483 if (w_value || w_index != rndis->ctrl_id)
484 goto invalid;
485 /* read the request; process it later */
486 value = w_length;
487 req->complete = rndis_command_complete;
488 req->context = rndis;
489 /* later, rndis_response_available() sends a notification */
490 break;
491
492 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
493 | USB_CDC_GET_ENCAPSULATED_RESPONSE:
494 if (w_value || w_index != rndis->ctrl_id)
495 goto invalid;
496 else {
497 u8 *buf;
498 u32 n;
499
500 /* return the result */
501 buf = rndis_get_next_response(rndis->config, &n);
502 if (buf) {
503 memcpy(req->buf, buf, n);
504 req->complete = rndis_response_complete;
505 req->context = rndis;
506 rndis_free_response(rndis->config, buf);
507 value = n;
508 }
509 /* else stalls ... spec says to avoid that */
510 }
511 break;
512
513 default:
514invalid:
515 VDBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
516 ctrl->bRequestType, ctrl->bRequest,
517 w_value, w_index, w_length);
518 }
519
520 /* respond with data transfer or status phase? */
521 if (value >= 0) {
522 DBG(cdev, "rndis req%02x.%02x v%04x i%04x l%d\n",
523 ctrl->bRequestType, ctrl->bRequest,
524 w_value, w_index, w_length);
525 req->zero = (value < w_length);
526 req->length = value;
527 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
528 if (value < 0)
529 ERROR(cdev, "rndis response on err %d\n", value);
530 }
531
532 /* device either stalls (value < 0) or reports success */
533 return value;
534}
535
536
537static int rndis_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
538{
539 struct f_rndis *rndis = func_to_rndis(f);
540 struct usb_composite_dev *cdev = f->config->cdev;
541
542 /* we know alt == 0 */
543
544 if (intf == rndis->ctrl_id) {
545 if (rndis->notify->driver_data) {
546 VDBG(cdev, "reset rndis control %d\n", intf);
547 usb_ep_disable(rndis->notify);
548 }
549 if (!rndis->notify->desc) {
550 VDBG(cdev, "init rndis ctrl %d\n", intf);
551 if (config_ep_by_speed(cdev->gadget, f, rndis->notify))
552 goto fail;
553 }
554 usb_ep_enable(rndis->notify);
555 rndis->notify->driver_data = rndis;
556
557 } else if (intf == rndis->data_id) {
558 struct net_device *net;
559
560 if (rndis->port.in_ep->driver_data) {
561 DBG(cdev, "reset rndis\n");
562 gether_disconnect(&rndis->port);
563 }
564
565 if (!rndis->port.in_ep->desc || !rndis->port.out_ep->desc) {
566 DBG(cdev, "init rndis\n");
567 if (config_ep_by_speed(cdev->gadget, f,
568 rndis->port.in_ep) ||
569 config_ep_by_speed(cdev->gadget, f,
570 rndis->port.out_ep)) {
571 rndis->port.in_ep->desc = NULL;
572 rndis->port.out_ep->desc = NULL;
573 goto fail;
574 }
575 }
576
577 /* Avoid ZLPs; they can be troublesome. */
578 rndis->port.is_zlp_ok = false;
579
580 /* RNDIS should be in the "RNDIS uninitialized" state,
581 * either never activated or after rndis_uninit().
582 *
583 * We don't want data to flow here until a nonzero packet
584 * filter is set, at which point it enters "RNDIS data
585 * initialized" state ... but we do want the endpoints
586 * to be activated. It's a strange little state.
587 *
588 * REVISIT the RNDIS gadget code has done this wrong for a
589 * very long time. We need another call to the link layer
590 * code -- gether_updown(...bool) maybe -- to do it right.
591 */
592 rndis->port.cdc_filter = 0;
593
594 DBG(cdev, "RNDIS RX/TX early activation ... \n");
595 net = gether_connect(&rndis->port);
596 if (IS_ERR(net))
597 return PTR_ERR(net);
598
599 rndis_set_param_dev(rndis->config, net,
600 &rndis->port.cdc_filter);
601 } else
602 goto fail;
603
604 return 0;
605fail:
606 return -EINVAL;
607}
608
609static void rndis_disable(struct usb_function *f)
610{
611 struct f_rndis *rndis = func_to_rndis(f);
612 struct usb_composite_dev *cdev = f->config->cdev;
613
614 if (!rndis->notify->driver_data)
615 return;
616
617 DBG(cdev, "rndis deactivated\n");
618
619 rndis_uninit(rndis->config);
620 gether_disconnect(&rndis->port);
621
622 usb_ep_disable(rndis->notify);
623 rndis->notify->driver_data = NULL;
624}
625
626/*-------------------------------------------------------------------------*/
627
628/*
629 * This isn't quite the same mechanism as CDC Ethernet, since the
630 * notification scheme passes less data, but the same set of link
631 * states must be tested. A key difference is that altsettings are
632 * not used to tell whether the link should send packets or not.
633 */
634
635static void rndis_open(struct gether *geth)
636{
637 struct f_rndis *rndis = func_to_rndis(&geth->func);
638 struct usb_composite_dev *cdev = geth->func.config->cdev;
639
640 DBG(cdev, "%s\n", __func__);
641
642 rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3,
643 bitrate(cdev->gadget) / 100);
644 rndis_signal_connect(rndis->config);
645}
646
647static void rndis_close(struct gether *geth)
648{
649 struct f_rndis *rndis = func_to_rndis(&geth->func);
650
651 DBG(geth->func.config->cdev, "%s\n", __func__);
652
653 rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3, 0);
654 rndis_signal_disconnect(rndis->config);
655}
656
657/*-------------------------------------------------------------------------*/
658
659/* ethernet function driver setup/binding */
660
661static int
662rndis_bind(struct usb_configuration *c, struct usb_function *f)
663{
664 struct usb_composite_dev *cdev = c->cdev;
665 struct f_rndis *rndis = func_to_rndis(f);
666 int status;
667 struct usb_ep *ep;
668
669 /* allocate instance-specific interface IDs */
670 status = usb_interface_id(c, f);
671 if (status < 0)
672 goto fail;
673 rndis->ctrl_id = status;
674 rndis_iad_descriptor.bFirstInterface = status;
675
676 rndis_control_intf.bInterfaceNumber = status;
677 rndis_union_desc.bMasterInterface0 = status;
678
679 status = usb_interface_id(c, f);
680 if (status < 0)
681 goto fail;
682 rndis->data_id = status;
683
684 rndis_data_intf.bInterfaceNumber = status;
685 rndis_union_desc.bSlaveInterface0 = status;
686
687 status = -ENODEV;
688
689 /* allocate instance-specific endpoints */
690 ep = usb_ep_autoconfig(cdev->gadget, &fs_in_desc);
691 if (!ep)
692 goto fail;
693 rndis->port.in_ep = ep;
694 ep->driver_data = cdev; /* claim */
695
696 ep = usb_ep_autoconfig(cdev->gadget, &fs_out_desc);
697 if (!ep)
698 goto fail;
699 rndis->port.out_ep = ep;
700 ep->driver_data = cdev; /* claim */
701
702 /* NOTE: a status/notification endpoint is, strictly speaking,
703 * optional. We don't treat it that way though! It's simpler,
704 * and some newer profiles don't treat it as optional.
705 */
706 ep = usb_ep_autoconfig(cdev->gadget, &fs_notify_desc);
707 if (!ep)
708 goto fail;
709 rndis->notify = ep;
710 ep->driver_data = cdev; /* claim */
711
712 status = -ENOMEM;
713
714 /* allocate notification request and buffer */
715 rndis->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL);
716 if (!rndis->notify_req)
717 goto fail;
718 rndis->notify_req->buf = kmalloc(STATUS_BYTECOUNT, GFP_KERNEL);
719 if (!rndis->notify_req->buf)
720 goto fail;
721 rndis->notify_req->length = STATUS_BYTECOUNT;
722 rndis->notify_req->context = rndis;
723 rndis->notify_req->complete = rndis_response_complete;
724
725 /* copy descriptors, and track endpoint copies */
726 f->descriptors = usb_copy_descriptors(eth_fs_function);
727 if (!f->descriptors)
728 goto fail;
729
730 /* support all relevant hardware speeds... we expect that when
731 * hardware is dual speed, all bulk-capable endpoints work at
732 * both speeds
733 */
734 if (gadget_is_dualspeed(c->cdev->gadget)) {
735 hs_in_desc.bEndpointAddress =
736 fs_in_desc.bEndpointAddress;
737 hs_out_desc.bEndpointAddress =
738 fs_out_desc.bEndpointAddress;
739 hs_notify_desc.bEndpointAddress =
740 fs_notify_desc.bEndpointAddress;
741
742 /* copy descriptors, and track endpoint copies */
743 f->hs_descriptors = usb_copy_descriptors(eth_hs_function);
744 if (!f->hs_descriptors)
745 goto fail;
746 }
747
748 if (gadget_is_superspeed(c->cdev->gadget)) {
749 ss_in_desc.bEndpointAddress =
750 fs_in_desc.bEndpointAddress;
751 ss_out_desc.bEndpointAddress =
752 fs_out_desc.bEndpointAddress;
753 ss_notify_desc.bEndpointAddress =
754 fs_notify_desc.bEndpointAddress;
755
756 /* copy descriptors, and track endpoint copies */
757 f->ss_descriptors = usb_copy_descriptors(eth_ss_function);
758 if (!f->ss_descriptors)
759 goto fail;
760 }
761
762 rndis->port.open = rndis_open;
763 rndis->port.close = rndis_close;
764
765 status = rndis_register(rndis_response_available, rndis);
766 if (status < 0)
767 goto fail;
768 rndis->config = status;
769
770 rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3, 0);
771 rndis_set_host_mac(rndis->config, rndis->ethaddr);
772
773 if (rndis->manufacturer && rndis->vendorID &&
774 rndis_set_param_vendor(rndis->config, rndis->vendorID,
775 rndis->manufacturer))
776 goto fail;
777
778 /* NOTE: all that is done without knowing or caring about
779 * the network link ... which is unavailable to this code
780 * until we're activated via set_alt().
781 */
782
783 DBG(cdev, "RNDIS: %s speed IN/%s OUT/%s NOTIFY/%s\n",
784 gadget_is_superspeed(c->cdev->gadget) ? "super" :
785 gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
786 rndis->port.in_ep->name, rndis->port.out_ep->name,
787 rndis->notify->name);
788 return 0;
789
790fail:
791 if (gadget_is_superspeed(c->cdev->gadget) && f->ss_descriptors)
792 usb_free_descriptors(f->ss_descriptors);
793 if (gadget_is_dualspeed(c->cdev->gadget) && f->hs_descriptors)
794 usb_free_descriptors(f->hs_descriptors);
795 if (f->descriptors)
796 usb_free_descriptors(f->descriptors);
797
798 if (rndis->notify_req) {
799 kfree(rndis->notify_req->buf);
800 usb_ep_free_request(rndis->notify, rndis->notify_req);
801 }
802
803 /* we might as well release our claims on endpoints */
804 if (rndis->notify)
805 rndis->notify->driver_data = NULL;
806 if (rndis->port.out_ep->desc)
807 rndis->port.out_ep->driver_data = NULL;
808 if (rndis->port.in_ep->desc)
809 rndis->port.in_ep->driver_data = NULL;
810
811 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
812
813 return status;
814}
815
816static void
817rndis_unbind(struct usb_configuration *c, struct usb_function *f)
818{
819 struct f_rndis *rndis = func_to_rndis(f);
820
821 rndis_deregister(rndis->config);
822 rndis_exit();
823 rndis_string_defs[0].id = 0;
824
825 if (gadget_is_superspeed(c->cdev->gadget))
826 usb_free_descriptors(f->ss_descriptors);
827 if (gadget_is_dualspeed(c->cdev->gadget))
828 usb_free_descriptors(f->hs_descriptors);
829 usb_free_descriptors(f->descriptors);
830
831 kfree(rndis->notify_req->buf);
832 usb_ep_free_request(rndis->notify, rndis->notify_req);
833
834 kfree(rndis);
835}
836
837/* Some controllers can't support RNDIS ... */
838static inline bool can_support_rndis(struct usb_configuration *c)
839{
840 /* everything else is *presumably* fine */
841 return true;
842}
843
844int
845rndis_bind_config_vendor(struct usb_configuration *c, u8 ethaddr[ETH_ALEN],
846 u32 vendorID, const char *manufacturer)
847{
848 struct f_rndis *rndis;
849 int status;
850
851 if (!can_support_rndis(c) || !ethaddr)
852 return -EINVAL;
853
854 /* maybe allocate device-global string IDs */
855 if (rndis_string_defs[0].id == 0) {
856
857 /* ... and setup RNDIS itself */
858 status = rndis_init();
859 if (status < 0)
860 return status;
861
862 /* control interface label */
863 status = usb_string_id(c->cdev);
864 if (status < 0)
865 return status;
866 rndis_string_defs[0].id = status;
867 rndis_control_intf.iInterface = status;
868
869 /* data interface label */
870 status = usb_string_id(c->cdev);
871 if (status < 0)
872 return status;
873 rndis_string_defs[1].id = status;
874 rndis_data_intf.iInterface = status;
875
876 /* IAD iFunction label */
877 status = usb_string_id(c->cdev);
878 if (status < 0)
879 return status;
880 rndis_string_defs[2].id = status;
881 rndis_iad_descriptor.iFunction = status;
882 }
883
884 /* allocate and initialize one new instance */
885 status = -ENOMEM;
886 rndis = kzalloc(sizeof *rndis, GFP_KERNEL);
887 if (!rndis)
888 goto fail;
889
890 memcpy(rndis->ethaddr, ethaddr, ETH_ALEN);
891 rndis->vendorID = vendorID;
892 rndis->manufacturer = manufacturer;
893
894 /* RNDIS activates when the host changes this filter */
895 rndis->port.cdc_filter = 0;
896
897 /* RNDIS has special (and complex) framing */
898 rndis->port.header_len = sizeof(struct rndis_packet_msg_type);
899 rndis->port.wrap = rndis_add_header;
900 rndis->port.unwrap = rndis_rm_hdr;
901
902 rndis->port.func.name = "rndis";
903 rndis->port.func.strings = rndis_strings;
904 /* descriptors are per-instance copies */
905 rndis->port.func.bind = rndis_bind;
906 rndis->port.func.unbind = rndis_unbind;
907 rndis->port.func.set_alt = rndis_set_alt;
908 rndis->port.func.setup = rndis_setup;
909 rndis->port.func.disable = rndis_disable;
910
911 status = usb_add_function(c, &rndis->port.func);
912 if (status) {
913 kfree(rndis);
914fail:
915 rndis_exit();
916 }
917 return status;
918}