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45fe3b8e DB |
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 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | /* #define VERBOSE_DEBUG */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/device.h> | |
27 | #include <linux/etherdevice.h> | |
28 | ||
29 | #include <asm/atomic.h> | |
30 | ||
31 | #include "u_ether.h" | |
32 | #include "rndis.h" | |
33 | ||
34 | ||
35 | /* | |
36 | * This function is an RNDIS Ethernet port -- a Microsoft protocol that's | |
37 | * been promoted instead of the standard CDC Ethernet. The published RNDIS | |
38 | * spec is ambiguous, incomplete, and needlessly complex. Variants such as | |
39 | * ActiveSync have even worse status in terms of specification. | |
40 | * | |
41 | * In short: it's a protocol controlled by (and for) Microsoft, not for an | |
42 | * Open ecosystem or markets. Linux supports it *only* because Microsoft | |
43 | * doesn't support the CDC Ethernet standard. | |
44 | * | |
45 | * The RNDIS data transfer model is complex, with multiple Ethernet packets | |
46 | * per USB message, and out of band data. The control model is built around | |
47 | * what's essentially an "RNDIS RPC" protocol. It's all wrapped in a CDC ACM | |
48 | * (modem, not Ethernet) veneer, with those ACM descriptors being entirely | |
49 | * useless (they're ignored). RNDIS expects to be the only function in its | |
50 | * configuration, so it's no real help if you need composite devices; and | |
51 | * it expects to be the first configuration too. | |
52 | * | |
53 | * There is a single technical advantage of RNDIS over CDC Ethernet, if you | |
54 | * discount the fluff that its RPC can be made to deliver: it doesn't need | |
55 | * a NOP altsetting for the data interface. That lets it work on some of the | |
56 | * "so smart it's stupid" hardware which takes over configuration changes | |
57 | * from the software, and adds restrictions like "no altsettings". | |
58 | * | |
59 | * Unfortunately MSFT's RNDIS drivers are buggy. They hang or oops, and | |
60 | * have all sorts of contrary-to-specification oddities that can prevent | |
61 | * them from working sanely. Since bugfixes (or accurate specs, letting | |
62 | * Linux work around those bugs) are unlikely to ever come from MSFT, you | |
63 | * may want to avoid using RNDIS on purely operational grounds. | |
64 | * | |
65 | * Omissions from the RNDIS 1.0 specification include: | |
66 | * | |
67 | * - Power management ... references data that's scattered around lots | |
68 | * of other documentation, which is incorrect/incomplete there too. | |
69 | * | |
70 | * - There are various undocumented protocol requirements, like the need | |
71 | * to send garbage in some control-OUT messages. | |
72 | * | |
73 | * - MS-Windows drivers sometimes emit undocumented requests. | |
74 | */ | |
75 | ||
76 | struct rndis_ep_descs { | |
77 | struct usb_endpoint_descriptor *in; | |
78 | struct usb_endpoint_descriptor *out; | |
79 | struct usb_endpoint_descriptor *notify; | |
80 | }; | |
81 | ||
82 | struct f_rndis { | |
83 | struct gether port; | |
84 | u8 ctrl_id, data_id; | |
85 | u8 ethaddr[ETH_ALEN]; | |
86 | int config; | |
87 | ||
45fe3b8e | 88 | struct rndis_ep_descs fs; |
45fe3b8e DB |
89 | struct rndis_ep_descs hs; |
90 | ||
91 | struct usb_ep *notify; | |
92 | struct usb_endpoint_descriptor *notify_desc; | |
93 | struct usb_request *notify_req; | |
94 | atomic_t notify_count; | |
95 | }; | |
96 | ||
97 | static inline struct f_rndis *func_to_rndis(struct usb_function *f) | |
98 | { | |
99 | return container_of(f, struct f_rndis, port.func); | |
100 | } | |
101 | ||
102 | /* peak (theoretical) bulk transfer rate in bits-per-second */ | |
103 | static unsigned int bitrate(struct usb_gadget *g) | |
104 | { | |
105 | if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) | |
106 | return 13 * 512 * 8 * 1000 * 8; | |
107 | else | |
108 | return 19 * 64 * 1 * 1000 * 8; | |
109 | } | |
110 | ||
111 | /*-------------------------------------------------------------------------*/ | |
112 | ||
113 | /* | |
114 | */ | |
115 | ||
116 | #define LOG2_STATUS_INTERVAL_MSEC 5 /* 1 << 5 == 32 msec */ | |
117 | #define STATUS_BYTECOUNT 8 /* 8 bytes data */ | |
118 | ||
119 | ||
120 | /* interface descriptor: */ | |
121 | ||
122 | static struct usb_interface_descriptor rndis_control_intf __initdata = { | |
123 | .bLength = sizeof rndis_control_intf, | |
124 | .bDescriptorType = USB_DT_INTERFACE, | |
125 | ||
126 | /* .bInterfaceNumber = DYNAMIC */ | |
127 | /* status endpoint is optional; this could be patched later */ | |
128 | .bNumEndpoints = 1, | |
129 | .bInterfaceClass = USB_CLASS_COMM, | |
130 | .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM, | |
131 | .bInterfaceProtocol = USB_CDC_ACM_PROTO_VENDOR, | |
132 | /* .iInterface = DYNAMIC */ | |
133 | }; | |
134 | ||
135 | static struct usb_cdc_header_desc header_desc __initdata = { | |
136 | .bLength = sizeof header_desc, | |
137 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
138 | .bDescriptorSubType = USB_CDC_HEADER_TYPE, | |
139 | ||
551509d2 | 140 | .bcdCDC = cpu_to_le16(0x0110), |
45fe3b8e DB |
141 | }; |
142 | ||
143 | static struct usb_cdc_call_mgmt_descriptor call_mgmt_descriptor __initdata = { | |
144 | .bLength = sizeof call_mgmt_descriptor, | |
145 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
146 | .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE, | |
147 | ||
148 | .bmCapabilities = 0x00, | |
149 | .bDataInterface = 0x01, | |
150 | }; | |
151 | ||
152 | static struct usb_cdc_acm_descriptor acm_descriptor __initdata = { | |
153 | .bLength = sizeof acm_descriptor, | |
154 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
155 | .bDescriptorSubType = USB_CDC_ACM_TYPE, | |
156 | ||
157 | .bmCapabilities = 0x00, | |
158 | }; | |
159 | ||
160 | static struct usb_cdc_union_desc rndis_union_desc __initdata = { | |
161 | .bLength = sizeof(rndis_union_desc), | |
162 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
163 | .bDescriptorSubType = USB_CDC_UNION_TYPE, | |
164 | /* .bMasterInterface0 = DYNAMIC */ | |
165 | /* .bSlaveInterface0 = DYNAMIC */ | |
166 | }; | |
167 | ||
168 | /* the data interface has two bulk endpoints */ | |
169 | ||
170 | static struct usb_interface_descriptor rndis_data_intf __initdata = { | |
171 | .bLength = sizeof rndis_data_intf, | |
172 | .bDescriptorType = USB_DT_INTERFACE, | |
173 | ||
174 | /* .bInterfaceNumber = DYNAMIC */ | |
45fe3b8e DB |
175 | .bNumEndpoints = 2, |
176 | .bInterfaceClass = USB_CLASS_CDC_DATA, | |
177 | .bInterfaceSubClass = 0, | |
178 | .bInterfaceProtocol = 0, | |
179 | /* .iInterface = DYNAMIC */ | |
180 | }; | |
181 | ||
182 | /* full speed support: */ | |
183 | ||
184 | static struct usb_endpoint_descriptor fs_notify_desc __initdata = { | |
185 | .bLength = USB_DT_ENDPOINT_SIZE, | |
186 | .bDescriptorType = USB_DT_ENDPOINT, | |
187 | ||
188 | .bEndpointAddress = USB_DIR_IN, | |
189 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
551509d2 | 190 | .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT), |
45fe3b8e DB |
191 | .bInterval = 1 << LOG2_STATUS_INTERVAL_MSEC, |
192 | }; | |
193 | ||
194 | static struct usb_endpoint_descriptor fs_in_desc __initdata = { | |
195 | .bLength = USB_DT_ENDPOINT_SIZE, | |
196 | .bDescriptorType = USB_DT_ENDPOINT, | |
197 | ||
198 | .bEndpointAddress = USB_DIR_IN, | |
199 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
200 | }; | |
201 | ||
202 | static struct usb_endpoint_descriptor fs_out_desc __initdata = { | |
203 | .bLength = USB_DT_ENDPOINT_SIZE, | |
204 | .bDescriptorType = USB_DT_ENDPOINT, | |
205 | ||
206 | .bEndpointAddress = USB_DIR_OUT, | |
207 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
208 | }; | |
209 | ||
210 | static struct usb_descriptor_header *eth_fs_function[] __initdata = { | |
211 | /* control interface matches ACM, not Ethernet */ | |
212 | (struct usb_descriptor_header *) &rndis_control_intf, | |
213 | (struct usb_descriptor_header *) &header_desc, | |
214 | (struct usb_descriptor_header *) &call_mgmt_descriptor, | |
215 | (struct usb_descriptor_header *) &acm_descriptor, | |
216 | (struct usb_descriptor_header *) &rndis_union_desc, | |
217 | (struct usb_descriptor_header *) &fs_notify_desc, | |
218 | /* data interface has no altsetting */ | |
219 | (struct usb_descriptor_header *) &rndis_data_intf, | |
220 | (struct usb_descriptor_header *) &fs_in_desc, | |
221 | (struct usb_descriptor_header *) &fs_out_desc, | |
222 | NULL, | |
223 | }; | |
224 | ||
225 | /* high speed support: */ | |
226 | ||
227 | static struct usb_endpoint_descriptor hs_notify_desc __initdata = { | |
228 | .bLength = USB_DT_ENDPOINT_SIZE, | |
229 | .bDescriptorType = USB_DT_ENDPOINT, | |
230 | ||
231 | .bEndpointAddress = USB_DIR_IN, | |
232 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
551509d2 | 233 | .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT), |
45fe3b8e DB |
234 | .bInterval = LOG2_STATUS_INTERVAL_MSEC + 4, |
235 | }; | |
236 | static struct usb_endpoint_descriptor hs_in_desc __initdata = { | |
237 | .bLength = USB_DT_ENDPOINT_SIZE, | |
238 | .bDescriptorType = USB_DT_ENDPOINT, | |
239 | ||
240 | .bEndpointAddress = USB_DIR_IN, | |
241 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 242 | .wMaxPacketSize = cpu_to_le16(512), |
45fe3b8e DB |
243 | }; |
244 | ||
245 | static struct usb_endpoint_descriptor hs_out_desc __initdata = { | |
246 | .bLength = USB_DT_ENDPOINT_SIZE, | |
247 | .bDescriptorType = USB_DT_ENDPOINT, | |
248 | ||
249 | .bEndpointAddress = USB_DIR_OUT, | |
250 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 251 | .wMaxPacketSize = cpu_to_le16(512), |
45fe3b8e DB |
252 | }; |
253 | ||
254 | static struct usb_descriptor_header *eth_hs_function[] __initdata = { | |
255 | /* control interface matches ACM, not Ethernet */ | |
256 | (struct usb_descriptor_header *) &rndis_control_intf, | |
257 | (struct usb_descriptor_header *) &header_desc, | |
258 | (struct usb_descriptor_header *) &call_mgmt_descriptor, | |
259 | (struct usb_descriptor_header *) &acm_descriptor, | |
260 | (struct usb_descriptor_header *) &rndis_union_desc, | |
261 | (struct usb_descriptor_header *) &hs_notify_desc, | |
262 | /* data interface has no altsetting */ | |
263 | (struct usb_descriptor_header *) &rndis_data_intf, | |
264 | (struct usb_descriptor_header *) &hs_in_desc, | |
265 | (struct usb_descriptor_header *) &hs_out_desc, | |
266 | NULL, | |
267 | }; | |
268 | ||
269 | /* string descriptors: */ | |
270 | ||
271 | static struct usb_string rndis_string_defs[] = { | |
272 | [0].s = "RNDIS Communications Control", | |
273 | [1].s = "RNDIS Ethernet Data", | |
274 | { } /* end of list */ | |
275 | }; | |
276 | ||
277 | static struct usb_gadget_strings rndis_string_table = { | |
278 | .language = 0x0409, /* en-us */ | |
279 | .strings = rndis_string_defs, | |
280 | }; | |
281 | ||
282 | static struct usb_gadget_strings *rndis_strings[] = { | |
283 | &rndis_string_table, | |
284 | NULL, | |
285 | }; | |
286 | ||
287 | /*-------------------------------------------------------------------------*/ | |
288 | ||
289 | static struct sk_buff *rndis_add_header(struct sk_buff *skb) | |
290 | { | |
291 | skb = skb_realloc_headroom(skb, sizeof(struct rndis_packet_msg_type)); | |
292 | if (skb) | |
293 | rndis_add_hdr(skb); | |
294 | return skb; | |
295 | } | |
296 | ||
297 | static void rndis_response_available(void *_rndis) | |
298 | { | |
299 | struct f_rndis *rndis = _rndis; | |
300 | struct usb_request *req = rndis->notify_req; | |
301 | struct usb_composite_dev *cdev = rndis->port.func.config->cdev; | |
302 | __le32 *data = req->buf; | |
303 | int status; | |
304 | ||
ff349505 | 305 | if (atomic_inc_return(&rndis->notify_count) != 1) |
45fe3b8e DB |
306 | return; |
307 | ||
308 | /* Send RNDIS RESPONSE_AVAILABLE notification; a | |
309 | * USB_CDC_NOTIFY_RESPONSE_AVAILABLE "should" work too | |
310 | * | |
311 | * This is the only notification defined by RNDIS. | |
312 | */ | |
313 | data[0] = cpu_to_le32(1); | |
314 | data[1] = cpu_to_le32(0); | |
315 | ||
316 | status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC); | |
317 | if (status) { | |
318 | atomic_dec(&rndis->notify_count); | |
319 | DBG(cdev, "notify/0 --> %d\n", status); | |
320 | } | |
321 | } | |
322 | ||
323 | static void rndis_response_complete(struct usb_ep *ep, struct usb_request *req) | |
324 | { | |
325 | struct f_rndis *rndis = req->context; | |
326 | struct usb_composite_dev *cdev = rndis->port.func.config->cdev; | |
327 | int status = req->status; | |
328 | ||
329 | /* after TX: | |
330 | * - USB_CDC_GET_ENCAPSULATED_RESPONSE (ep0/control) | |
331 | * - RNDIS_RESPONSE_AVAILABLE (status/irq) | |
332 | */ | |
333 | switch (status) { | |
334 | case -ECONNRESET: | |
335 | case -ESHUTDOWN: | |
336 | /* connection gone */ | |
337 | atomic_set(&rndis->notify_count, 0); | |
338 | break; | |
339 | default: | |
340 | DBG(cdev, "RNDIS %s response error %d, %d/%d\n", | |
341 | ep->name, status, | |
342 | req->actual, req->length); | |
343 | /* FALLTHROUGH */ | |
344 | case 0: | |
345 | if (ep != rndis->notify) | |
346 | break; | |
347 | ||
348 | /* handle multiple pending RNDIS_RESPONSE_AVAILABLE | |
349 | * notifications by resending until we're done | |
350 | */ | |
351 | if (atomic_dec_and_test(&rndis->notify_count)) | |
352 | break; | |
353 | status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC); | |
354 | if (status) { | |
355 | atomic_dec(&rndis->notify_count); | |
356 | DBG(cdev, "notify/1 --> %d\n", status); | |
357 | } | |
358 | break; | |
359 | } | |
360 | } | |
361 | ||
362 | static void rndis_command_complete(struct usb_ep *ep, struct usb_request *req) | |
363 | { | |
364 | struct f_rndis *rndis = req->context; | |
365 | struct usb_composite_dev *cdev = rndis->port.func.config->cdev; | |
366 | int status; | |
367 | ||
368 | /* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */ | |
369 | // spin_lock(&dev->lock); | |
370 | status = rndis_msg_parser(rndis->config, (u8 *) req->buf); | |
371 | if (status < 0) | |
372 | ERROR(cdev, "RNDIS command error %d, %d/%d\n", | |
373 | status, req->actual, req->length); | |
374 | // spin_unlock(&dev->lock); | |
375 | } | |
376 | ||
377 | static int | |
378 | rndis_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) | |
379 | { | |
380 | struct f_rndis *rndis = func_to_rndis(f); | |
381 | struct usb_composite_dev *cdev = f->config->cdev; | |
382 | struct usb_request *req = cdev->req; | |
383 | int value = -EOPNOTSUPP; | |
384 | u16 w_index = le16_to_cpu(ctrl->wIndex); | |
385 | u16 w_value = le16_to_cpu(ctrl->wValue); | |
386 | u16 w_length = le16_to_cpu(ctrl->wLength); | |
387 | ||
388 | /* composite driver infrastructure handles everything except | |
389 | * CDC class messages; interface activation uses set_alt(). | |
390 | */ | |
391 | switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { | |
392 | ||
393 | /* RNDIS uses the CDC command encapsulation mechanism to implement | |
394 | * an RPC scheme, with much getting/setting of attributes by OID. | |
395 | */ | |
396 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | |
397 | | USB_CDC_SEND_ENCAPSULATED_COMMAND: | |
398 | if (w_length > req->length || w_value | |
399 | || w_index != rndis->ctrl_id) | |
400 | goto invalid; | |
401 | /* read the request; process it later */ | |
402 | value = w_length; | |
403 | req->complete = rndis_command_complete; | |
404 | req->context = rndis; | |
405 | /* later, rndis_response_available() sends a notification */ | |
406 | break; | |
407 | ||
408 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | |
409 | | USB_CDC_GET_ENCAPSULATED_RESPONSE: | |
410 | if (w_value || w_index != rndis->ctrl_id) | |
411 | goto invalid; | |
412 | else { | |
413 | u8 *buf; | |
414 | u32 n; | |
415 | ||
416 | /* return the result */ | |
417 | buf = rndis_get_next_response(rndis->config, &n); | |
418 | if (buf) { | |
419 | memcpy(req->buf, buf, n); | |
420 | req->complete = rndis_response_complete; | |
421 | rndis_free_response(rndis->config, buf); | |
422 | value = n; | |
423 | } | |
424 | /* else stalls ... spec says to avoid that */ | |
425 | } | |
426 | break; | |
427 | ||
428 | default: | |
429 | invalid: | |
430 | VDBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", | |
431 | ctrl->bRequestType, ctrl->bRequest, | |
432 | w_value, w_index, w_length); | |
433 | } | |
434 | ||
435 | /* respond with data transfer or status phase? */ | |
436 | if (value >= 0) { | |
437 | DBG(cdev, "rndis req%02x.%02x v%04x i%04x l%d\n", | |
438 | ctrl->bRequestType, ctrl->bRequest, | |
439 | w_value, w_index, w_length); | |
090b9011 | 440 | req->zero = (value < w_length); |
45fe3b8e DB |
441 | req->length = value; |
442 | value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
443 | if (value < 0) | |
444 | ERROR(cdev, "rndis response on err %d\n", value); | |
445 | } | |
446 | ||
447 | /* device either stalls (value < 0) or reports success */ | |
448 | return value; | |
449 | } | |
450 | ||
451 | ||
452 | static int rndis_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
453 | { | |
454 | struct f_rndis *rndis = func_to_rndis(f); | |
455 | struct usb_composite_dev *cdev = f->config->cdev; | |
456 | ||
457 | /* we know alt == 0 */ | |
458 | ||
459 | if (intf == rndis->ctrl_id) { | |
460 | if (rndis->notify->driver_data) { | |
461 | VDBG(cdev, "reset rndis control %d\n", intf); | |
462 | usb_ep_disable(rndis->notify); | |
463 | } else { | |
464 | VDBG(cdev, "init rndis ctrl %d\n", intf); | |
465 | rndis->notify_desc = ep_choose(cdev->gadget, | |
466 | rndis->hs.notify, | |
467 | rndis->fs.notify); | |
468 | } | |
469 | usb_ep_enable(rndis->notify, rndis->notify_desc); | |
470 | rndis->notify->driver_data = rndis; | |
471 | ||
472 | } else if (intf == rndis->data_id) { | |
473 | struct net_device *net; | |
474 | ||
475 | if (rndis->port.in_ep->driver_data) { | |
476 | DBG(cdev, "reset rndis\n"); | |
477 | gether_disconnect(&rndis->port); | |
830d1b18 MM |
478 | } |
479 | ||
480 | if (!rndis->port.in) { | |
45fe3b8e DB |
481 | DBG(cdev, "init rndis\n"); |
482 | rndis->port.in = ep_choose(cdev->gadget, | |
483 | rndis->hs.in, rndis->fs.in); | |
484 | rndis->port.out = ep_choose(cdev->gadget, | |
485 | rndis->hs.out, rndis->fs.out); | |
486 | } | |
487 | ||
488 | /* Avoid ZLPs; they can be troublesome. */ | |
489 | rndis->port.is_zlp_ok = false; | |
490 | ||
491 | /* RNDIS should be in the "RNDIS uninitialized" state, | |
492 | * either never activated or after rndis_uninit(). | |
493 | * | |
494 | * We don't want data to flow here until a nonzero packet | |
495 | * filter is set, at which point it enters "RNDIS data | |
496 | * initialized" state ... but we do want the endpoints | |
497 | * to be activated. It's a strange little state. | |
498 | * | |
499 | * REVISIT the RNDIS gadget code has done this wrong for a | |
500 | * very long time. We need another call to the link layer | |
501 | * code -- gether_updown(...bool) maybe -- to do it right. | |
502 | */ | |
503 | rndis->port.cdc_filter = 0; | |
504 | ||
505 | DBG(cdev, "RNDIS RX/TX early activation ... \n"); | |
506 | net = gether_connect(&rndis->port); | |
507 | if (IS_ERR(net)) | |
508 | return PTR_ERR(net); | |
509 | ||
510 | rndis_set_param_dev(rndis->config, net, | |
511 | &rndis->port.cdc_filter); | |
512 | } else | |
513 | goto fail; | |
514 | ||
515 | return 0; | |
516 | fail: | |
517 | return -EINVAL; | |
518 | } | |
519 | ||
520 | static void rndis_disable(struct usb_function *f) | |
521 | { | |
522 | struct f_rndis *rndis = func_to_rndis(f); | |
523 | struct usb_composite_dev *cdev = f->config->cdev; | |
524 | ||
525 | if (!rndis->notify->driver_data) | |
526 | return; | |
527 | ||
528 | DBG(cdev, "rndis deactivated\n"); | |
529 | ||
530 | rndis_uninit(rndis->config); | |
531 | gether_disconnect(&rndis->port); | |
532 | ||
533 | usb_ep_disable(rndis->notify); | |
534 | rndis->notify->driver_data = NULL; | |
535 | } | |
536 | ||
537 | /*-------------------------------------------------------------------------*/ | |
538 | ||
539 | /* | |
540 | * This isn't quite the same mechanism as CDC Ethernet, since the | |
541 | * notification scheme passes less data, but the same set of link | |
542 | * states must be tested. A key difference is that altsettings are | |
543 | * not used to tell whether the link should send packets or not. | |
544 | */ | |
545 | ||
546 | static void rndis_open(struct gether *geth) | |
547 | { | |
548 | struct f_rndis *rndis = func_to_rndis(&geth->func); | |
549 | struct usb_composite_dev *cdev = geth->func.config->cdev; | |
550 | ||
551 | DBG(cdev, "%s\n", __func__); | |
552 | ||
553 | rndis_set_param_medium(rndis->config, NDIS_MEDIUM_802_3, | |
554 | bitrate(cdev->gadget) / 100); | |
555 | rndis_signal_connect(rndis->config); | |
556 | } | |
557 | ||
558 | static void rndis_close(struct gether *geth) | |
559 | { | |
560 | struct f_rndis *rndis = func_to_rndis(&geth->func); | |
561 | ||
562 | DBG(geth->func.config->cdev, "%s\n", __func__); | |
563 | ||
564 | rndis_set_param_medium(rndis->config, NDIS_MEDIUM_802_3, 0); | |
565 | rndis_signal_disconnect(rndis->config); | |
566 | } | |
567 | ||
568 | /*-------------------------------------------------------------------------*/ | |
569 | ||
570 | /* ethernet function driver setup/binding */ | |
571 | ||
572 | static int __init | |
573 | rndis_bind(struct usb_configuration *c, struct usb_function *f) | |
574 | { | |
575 | struct usb_composite_dev *cdev = c->cdev; | |
576 | struct f_rndis *rndis = func_to_rndis(f); | |
577 | int status; | |
578 | struct usb_ep *ep; | |
579 | ||
580 | /* allocate instance-specific interface IDs */ | |
581 | status = usb_interface_id(c, f); | |
582 | if (status < 0) | |
583 | goto fail; | |
584 | rndis->ctrl_id = status; | |
585 | ||
586 | rndis_control_intf.bInterfaceNumber = status; | |
587 | rndis_union_desc.bMasterInterface0 = status; | |
588 | ||
589 | status = usb_interface_id(c, f); | |
590 | if (status < 0) | |
591 | goto fail; | |
592 | rndis->data_id = status; | |
593 | ||
594 | rndis_data_intf.bInterfaceNumber = status; | |
595 | rndis_union_desc.bSlaveInterface0 = status; | |
596 | ||
597 | status = -ENODEV; | |
598 | ||
599 | /* allocate instance-specific endpoints */ | |
600 | ep = usb_ep_autoconfig(cdev->gadget, &fs_in_desc); | |
601 | if (!ep) | |
602 | goto fail; | |
603 | rndis->port.in_ep = ep; | |
604 | ep->driver_data = cdev; /* claim */ | |
605 | ||
606 | ep = usb_ep_autoconfig(cdev->gadget, &fs_out_desc); | |
607 | if (!ep) | |
608 | goto fail; | |
609 | rndis->port.out_ep = ep; | |
610 | ep->driver_data = cdev; /* claim */ | |
611 | ||
612 | /* NOTE: a status/notification endpoint is, strictly speaking, | |
613 | * optional. We don't treat it that way though! It's simpler, | |
614 | * and some newer profiles don't treat it as optional. | |
615 | */ | |
616 | ep = usb_ep_autoconfig(cdev->gadget, &fs_notify_desc); | |
617 | if (!ep) | |
618 | goto fail; | |
619 | rndis->notify = ep; | |
620 | ep->driver_data = cdev; /* claim */ | |
621 | ||
622 | status = -ENOMEM; | |
623 | ||
624 | /* allocate notification request and buffer */ | |
625 | rndis->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
626 | if (!rndis->notify_req) | |
627 | goto fail; | |
628 | rndis->notify_req->buf = kmalloc(STATUS_BYTECOUNT, GFP_KERNEL); | |
629 | if (!rndis->notify_req->buf) | |
630 | goto fail; | |
631 | rndis->notify_req->length = STATUS_BYTECOUNT; | |
632 | rndis->notify_req->context = rndis; | |
633 | rndis->notify_req->complete = rndis_response_complete; | |
634 | ||
635 | /* copy descriptors, and track endpoint copies */ | |
636 | f->descriptors = usb_copy_descriptors(eth_fs_function); | |
637 | if (!f->descriptors) | |
638 | goto fail; | |
639 | ||
640 | rndis->fs.in = usb_find_endpoint(eth_fs_function, | |
641 | f->descriptors, &fs_in_desc); | |
642 | rndis->fs.out = usb_find_endpoint(eth_fs_function, | |
643 | f->descriptors, &fs_out_desc); | |
644 | rndis->fs.notify = usb_find_endpoint(eth_fs_function, | |
645 | f->descriptors, &fs_notify_desc); | |
646 | ||
647 | /* support all relevant hardware speeds... we expect that when | |
648 | * hardware is dual speed, all bulk-capable endpoints work at | |
649 | * both speeds | |
650 | */ | |
651 | if (gadget_is_dualspeed(c->cdev->gadget)) { | |
652 | hs_in_desc.bEndpointAddress = | |
653 | fs_in_desc.bEndpointAddress; | |
654 | hs_out_desc.bEndpointAddress = | |
655 | fs_out_desc.bEndpointAddress; | |
7c124149 DB |
656 | hs_notify_desc.bEndpointAddress = |
657 | fs_notify_desc.bEndpointAddress; | |
45fe3b8e DB |
658 | |
659 | /* copy descriptors, and track endpoint copies */ | |
660 | f->hs_descriptors = usb_copy_descriptors(eth_hs_function); | |
661 | ||
662 | if (!f->hs_descriptors) | |
663 | goto fail; | |
664 | ||
665 | rndis->hs.in = usb_find_endpoint(eth_hs_function, | |
666 | f->hs_descriptors, &hs_in_desc); | |
667 | rndis->hs.out = usb_find_endpoint(eth_hs_function, | |
668 | f->hs_descriptors, &hs_out_desc); | |
7c124149 DB |
669 | rndis->hs.notify = usb_find_endpoint(eth_hs_function, |
670 | f->hs_descriptors, &hs_notify_desc); | |
45fe3b8e DB |
671 | } |
672 | ||
673 | rndis->port.open = rndis_open; | |
674 | rndis->port.close = rndis_close; | |
675 | ||
676 | status = rndis_register(rndis_response_available, rndis); | |
677 | if (status < 0) | |
678 | goto fail; | |
679 | rndis->config = status; | |
680 | ||
681 | rndis_set_param_medium(rndis->config, NDIS_MEDIUM_802_3, 0); | |
682 | rndis_set_host_mac(rndis->config, rndis->ethaddr); | |
683 | ||
684 | #if 0 | |
685 | // FIXME | |
686 | if (rndis_set_param_vendor(rndis->config, vendorID, | |
687 | manufacturer)) | |
688 | goto fail0; | |
689 | #endif | |
690 | ||
691 | /* NOTE: all that is done without knowing or caring about | |
692 | * the network link ... which is unavailable to this code | |
693 | * until we're activated via set_alt(). | |
694 | */ | |
695 | ||
696 | DBG(cdev, "RNDIS: %s speed IN/%s OUT/%s NOTIFY/%s\n", | |
697 | gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", | |
698 | rndis->port.in_ep->name, rndis->port.out_ep->name, | |
699 | rndis->notify->name); | |
700 | return 0; | |
701 | ||
702 | fail: | |
703 | if (gadget_is_dualspeed(c->cdev->gadget) && f->hs_descriptors) | |
704 | usb_free_descriptors(f->hs_descriptors); | |
705 | if (f->descriptors) | |
706 | usb_free_descriptors(f->descriptors); | |
707 | ||
708 | if (rndis->notify_req) { | |
709 | kfree(rndis->notify_req->buf); | |
710 | usb_ep_free_request(rndis->notify, rndis->notify_req); | |
711 | } | |
712 | ||
713 | /* we might as well release our claims on endpoints */ | |
714 | if (rndis->notify) | |
715 | rndis->notify->driver_data = NULL; | |
716 | if (rndis->port.out) | |
717 | rndis->port.out_ep->driver_data = NULL; | |
718 | if (rndis->port.in) | |
719 | rndis->port.in_ep->driver_data = NULL; | |
720 | ||
721 | ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); | |
722 | ||
723 | return status; | |
724 | } | |
725 | ||
726 | static void | |
727 | rndis_unbind(struct usb_configuration *c, struct usb_function *f) | |
728 | { | |
729 | struct f_rndis *rndis = func_to_rndis(f); | |
730 | ||
731 | rndis_deregister(rndis->config); | |
732 | rndis_exit(); | |
733 | ||
734 | if (gadget_is_dualspeed(c->cdev->gadget)) | |
735 | usb_free_descriptors(f->hs_descriptors); | |
736 | usb_free_descriptors(f->descriptors); | |
737 | ||
738 | kfree(rndis->notify_req->buf); | |
739 | usb_ep_free_request(rndis->notify, rndis->notify_req); | |
740 | ||
741 | kfree(rndis); | |
742 | } | |
743 | ||
744 | /* Some controllers can't support RNDIS ... */ | |
745 | static inline bool can_support_rndis(struct usb_configuration *c) | |
746 | { | |
747 | /* only two endpoints on sa1100 */ | |
748 | if (gadget_is_sa1100(c->cdev->gadget)) | |
749 | return false; | |
750 | ||
751 | /* everything else is *presumably* fine */ | |
752 | return true; | |
753 | } | |
754 | ||
755 | /** | |
756 | * rndis_bind_config - add RNDIS network link to a configuration | |
757 | * @c: the configuration to support the network link | |
758 | * @ethaddr: a buffer in which the ethernet address of the host side | |
759 | * side of the link was recorded | |
760 | * Context: single threaded during gadget setup | |
761 | * | |
762 | * Returns zero on success, else negative errno. | |
763 | * | |
764 | * Caller must have called @gether_setup(). Caller is also responsible | |
765 | * for calling @gether_cleanup() before module unload. | |
766 | */ | |
767 | int __init rndis_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]) | |
768 | { | |
769 | struct f_rndis *rndis; | |
770 | int status; | |
771 | ||
772 | if (!can_support_rndis(c) || !ethaddr) | |
773 | return -EINVAL; | |
774 | ||
775 | /* maybe allocate device-global string IDs */ | |
776 | if (rndis_string_defs[0].id == 0) { | |
777 | ||
778 | /* ... and setup RNDIS itself */ | |
779 | status = rndis_init(); | |
780 | if (status < 0) | |
781 | return status; | |
782 | ||
783 | /* control interface label */ | |
784 | status = usb_string_id(c->cdev); | |
785 | if (status < 0) | |
786 | return status; | |
787 | rndis_string_defs[0].id = status; | |
788 | rndis_control_intf.iInterface = status; | |
789 | ||
790 | /* data interface label */ | |
791 | status = usb_string_id(c->cdev); | |
792 | if (status < 0) | |
793 | return status; | |
794 | rndis_string_defs[1].id = status; | |
795 | rndis_data_intf.iInterface = status; | |
796 | } | |
797 | ||
798 | /* allocate and initialize one new instance */ | |
799 | status = -ENOMEM; | |
800 | rndis = kzalloc(sizeof *rndis, GFP_KERNEL); | |
801 | if (!rndis) | |
802 | goto fail; | |
803 | ||
804 | memcpy(rndis->ethaddr, ethaddr, ETH_ALEN); | |
805 | ||
806 | /* RNDIS activates when the host changes this filter */ | |
807 | rndis->port.cdc_filter = 0; | |
808 | ||
809 | /* RNDIS has special (and complex) framing */ | |
810 | rndis->port.header_len = sizeof(struct rndis_packet_msg_type); | |
811 | rndis->port.wrap = rndis_add_header; | |
812 | rndis->port.unwrap = rndis_rm_hdr; | |
813 | ||
814 | rndis->port.func.name = "rndis"; | |
815 | rndis->port.func.strings = rndis_strings; | |
816 | /* descriptors are per-instance copies */ | |
817 | rndis->port.func.bind = rndis_bind; | |
818 | rndis->port.func.unbind = rndis_unbind; | |
819 | rndis->port.func.set_alt = rndis_set_alt; | |
820 | rndis->port.func.setup = rndis_setup; | |
821 | rndis->port.func.disable = rndis_disable; | |
822 | ||
823 | status = usb_add_function(c, &rndis->port.func); | |
824 | if (status) { | |
825 | kfree(rndis); | |
826 | fail: | |
827 | rndis_exit(); | |
828 | } | |
829 | return status; | |
830 | } |