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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0+ |
45fe3b8e DB |
2 | /* |
3 | * f_rndis.c -- RNDIS link function driver | |
4 | * | |
5 | * Copyright (C) 2003-2005,2008 David Brownell | |
6 | * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger | |
7 | * Copyright (C) 2008 Nokia Corporation | |
b97503ff | 8 | * Copyright (C) 2009 Samsung Electronics |
54b8360f | 9 | * Author: Michal Nazarewicz (mina86@mina86.com) |
45fe3b8e DB |
10 | */ |
11 | ||
12 | /* #define VERBOSE_DEBUG */ | |
13 | ||
5a0e3ad6 | 14 | #include <linux/slab.h> |
45fe3b8e | 15 | #include <linux/kernel.h> |
f466c635 | 16 | #include <linux/module.h> |
45fe3b8e DB |
17 | #include <linux/device.h> |
18 | #include <linux/etherdevice.h> | |
19 | ||
60063497 | 20 | #include <linux/atomic.h> |
45fe3b8e DB |
21 | |
22 | #include "u_ether.h" | |
b3df2faa | 23 | #include "u_ether_configfs.h" |
f466c635 | 24 | #include "u_rndis.h" |
45fe3b8e | 25 | #include "rndis.h" |
a747b095 | 26 | #include "configfs.h" |
45fe3b8e | 27 | |
45fe3b8e DB |
28 | /* |
29 | * This function is an RNDIS Ethernet port -- a Microsoft protocol that's | |
30 | * been promoted instead of the standard CDC Ethernet. The published RNDIS | |
31 | * spec is ambiguous, incomplete, and needlessly complex. Variants such as | |
32 | * ActiveSync have even worse status in terms of specification. | |
33 | * | |
34 | * In short: it's a protocol controlled by (and for) Microsoft, not for an | |
35 | * Open ecosystem or markets. Linux supports it *only* because Microsoft | |
36 | * doesn't support the CDC Ethernet standard. | |
37 | * | |
38 | * The RNDIS data transfer model is complex, with multiple Ethernet packets | |
39 | * per USB message, and out of band data. The control model is built around | |
40 | * what's essentially an "RNDIS RPC" protocol. It's all wrapped in a CDC ACM | |
41 | * (modem, not Ethernet) veneer, with those ACM descriptors being entirely | |
42 | * useless (they're ignored). RNDIS expects to be the only function in its | |
43 | * configuration, so it's no real help if you need composite devices; and | |
44 | * it expects to be the first configuration too. | |
45 | * | |
46 | * There is a single technical advantage of RNDIS over CDC Ethernet, if you | |
47 | * discount the fluff that its RPC can be made to deliver: it doesn't need | |
48 | * a NOP altsetting for the data interface. That lets it work on some of the | |
49 | * "so smart it's stupid" hardware which takes over configuration changes | |
50 | * from the software, and adds restrictions like "no altsettings". | |
51 | * | |
52 | * Unfortunately MSFT's RNDIS drivers are buggy. They hang or oops, and | |
53 | * have all sorts of contrary-to-specification oddities that can prevent | |
54 | * them from working sanely. Since bugfixes (or accurate specs, letting | |
55 | * Linux work around those bugs) are unlikely to ever come from MSFT, you | |
56 | * may want to avoid using RNDIS on purely operational grounds. | |
57 | * | |
58 | * Omissions from the RNDIS 1.0 specification include: | |
59 | * | |
60 | * - Power management ... references data that's scattered around lots | |
61 | * of other documentation, which is incorrect/incomplete there too. | |
62 | * | |
63 | * - There are various undocumented protocol requirements, like the need | |
64 | * to send garbage in some control-OUT messages. | |
65 | * | |
66 | * - MS-Windows drivers sometimes emit undocumented requests. | |
67 | */ | |
68 | ||
45fe3b8e DB |
69 | struct f_rndis { |
70 | struct gether port; | |
71 | u8 ctrl_id, data_id; | |
72 | u8 ethaddr[ETH_ALEN]; | |
1fbfeff9 BG |
73 | u32 vendorID; |
74 | const char *manufacturer; | |
83210e59 | 75 | struct rndis_params *params; |
45fe3b8e | 76 | |
45fe3b8e | 77 | struct usb_ep *notify; |
45fe3b8e DB |
78 | struct usb_request *notify_req; |
79 | atomic_t notify_count; | |
80 | }; | |
81 | ||
82 | static inline struct f_rndis *func_to_rndis(struct usb_function *f) | |
83 | { | |
84 | return container_of(f, struct f_rndis, port.func); | |
85 | } | |
86 | ||
87 | /* peak (theoretical) bulk transfer rate in bits-per-second */ | |
88 | static unsigned int bitrate(struct usb_gadget *g) | |
89 | { | |
04617db7 PZ |
90 | if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER) |
91 | return 13 * 1024 * 8 * 1000 * 8; | |
92 | else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) | |
45fe3b8e DB |
93 | return 13 * 512 * 8 * 1000 * 8; |
94 | else | |
04617db7 | 95 | return 19 * 64 * 1 * 1000 * 8; |
45fe3b8e DB |
96 | } |
97 | ||
98 | /*-------------------------------------------------------------------------*/ | |
99 | ||
100 | /* | |
101 | */ | |
102 | ||
bcb2f99c | 103 | #define RNDIS_STATUS_INTERVAL_MS 32 |
45fe3b8e DB |
104 | #define STATUS_BYTECOUNT 8 /* 8 bytes data */ |
105 | ||
106 | ||
107 | /* interface descriptor: */ | |
108 | ||
28824b18 | 109 | static struct usb_interface_descriptor rndis_control_intf = { |
45fe3b8e DB |
110 | .bLength = sizeof rndis_control_intf, |
111 | .bDescriptorType = USB_DT_INTERFACE, | |
112 | ||
113 | /* .bInterfaceNumber = DYNAMIC */ | |
114 | /* status endpoint is optional; this could be patched later */ | |
115 | .bNumEndpoints = 1, | |
116 | .bInterfaceClass = USB_CLASS_COMM, | |
117 | .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM, | |
118 | .bInterfaceProtocol = USB_CDC_ACM_PROTO_VENDOR, | |
119 | /* .iInterface = DYNAMIC */ | |
120 | }; | |
121 | ||
28824b18 | 122 | static struct usb_cdc_header_desc header_desc = { |
45fe3b8e DB |
123 | .bLength = sizeof header_desc, |
124 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
125 | .bDescriptorSubType = USB_CDC_HEADER_TYPE, | |
126 | ||
551509d2 | 127 | .bcdCDC = cpu_to_le16(0x0110), |
45fe3b8e DB |
128 | }; |
129 | ||
28824b18 | 130 | static struct usb_cdc_call_mgmt_descriptor call_mgmt_descriptor = { |
45fe3b8e DB |
131 | .bLength = sizeof call_mgmt_descriptor, |
132 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
133 | .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE, | |
134 | ||
135 | .bmCapabilities = 0x00, | |
136 | .bDataInterface = 0x01, | |
137 | }; | |
138 | ||
28824b18 | 139 | static struct usb_cdc_acm_descriptor rndis_acm_descriptor = { |
b97503ff | 140 | .bLength = sizeof rndis_acm_descriptor, |
45fe3b8e DB |
141 | .bDescriptorType = USB_DT_CS_INTERFACE, |
142 | .bDescriptorSubType = USB_CDC_ACM_TYPE, | |
143 | ||
144 | .bmCapabilities = 0x00, | |
145 | }; | |
146 | ||
28824b18 | 147 | static struct usb_cdc_union_desc rndis_union_desc = { |
45fe3b8e DB |
148 | .bLength = sizeof(rndis_union_desc), |
149 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
150 | .bDescriptorSubType = USB_CDC_UNION_TYPE, | |
151 | /* .bMasterInterface0 = DYNAMIC */ | |
152 | /* .bSlaveInterface0 = DYNAMIC */ | |
153 | }; | |
154 | ||
155 | /* the data interface has two bulk endpoints */ | |
156 | ||
28824b18 | 157 | static struct usb_interface_descriptor rndis_data_intf = { |
45fe3b8e DB |
158 | .bLength = sizeof rndis_data_intf, |
159 | .bDescriptorType = USB_DT_INTERFACE, | |
160 | ||
161 | /* .bInterfaceNumber = DYNAMIC */ | |
45fe3b8e DB |
162 | .bNumEndpoints = 2, |
163 | .bInterfaceClass = USB_CLASS_CDC_DATA, | |
164 | .bInterfaceSubClass = 0, | |
165 | .bInterfaceProtocol = 0, | |
166 | /* .iInterface = DYNAMIC */ | |
167 | }; | |
168 | ||
b97503ff MN |
169 | |
170 | static struct usb_interface_assoc_descriptor | |
171 | rndis_iad_descriptor = { | |
172 | .bLength = sizeof rndis_iad_descriptor, | |
173 | .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, | |
174 | ||
175 | .bFirstInterface = 0, /* XXX, hardcoded */ | |
176 | .bInterfaceCount = 2, // control + data | |
177 | .bFunctionClass = USB_CLASS_COMM, | |
178 | .bFunctionSubClass = USB_CDC_SUBCLASS_ETHERNET, | |
179 | .bFunctionProtocol = USB_CDC_PROTO_NONE, | |
180 | /* .iFunction = DYNAMIC */ | |
181 | }; | |
182 | ||
45fe3b8e DB |
183 | /* full speed support: */ |
184 | ||
28824b18 | 185 | static struct usb_endpoint_descriptor fs_notify_desc = { |
45fe3b8e DB |
186 | .bLength = USB_DT_ENDPOINT_SIZE, |
187 | .bDescriptorType = USB_DT_ENDPOINT, | |
188 | ||
189 | .bEndpointAddress = USB_DIR_IN, | |
190 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
551509d2 | 191 | .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT), |
bcb2f99c | 192 | .bInterval = RNDIS_STATUS_INTERVAL_MS, |
45fe3b8e DB |
193 | }; |
194 | ||
28824b18 | 195 | static struct usb_endpoint_descriptor fs_in_desc = { |
45fe3b8e DB |
196 | .bLength = USB_DT_ENDPOINT_SIZE, |
197 | .bDescriptorType = USB_DT_ENDPOINT, | |
198 | ||
199 | .bEndpointAddress = USB_DIR_IN, | |
200 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
201 | }; | |
202 | ||
28824b18 | 203 | static struct usb_endpoint_descriptor fs_out_desc = { |
45fe3b8e DB |
204 | .bLength = USB_DT_ENDPOINT_SIZE, |
205 | .bDescriptorType = USB_DT_ENDPOINT, | |
206 | ||
207 | .bEndpointAddress = USB_DIR_OUT, | |
208 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
209 | }; | |
210 | ||
28824b18 | 211 | static struct usb_descriptor_header *eth_fs_function[] = { |
b97503ff | 212 | (struct usb_descriptor_header *) &rndis_iad_descriptor, |
04617db7 | 213 | |
45fe3b8e DB |
214 | /* control interface matches ACM, not Ethernet */ |
215 | (struct usb_descriptor_header *) &rndis_control_intf, | |
216 | (struct usb_descriptor_header *) &header_desc, | |
217 | (struct usb_descriptor_header *) &call_mgmt_descriptor, | |
b97503ff | 218 | (struct usb_descriptor_header *) &rndis_acm_descriptor, |
45fe3b8e DB |
219 | (struct usb_descriptor_header *) &rndis_union_desc, |
220 | (struct usb_descriptor_header *) &fs_notify_desc, | |
04617db7 | 221 | |
45fe3b8e DB |
222 | /* data interface has no altsetting */ |
223 | (struct usb_descriptor_header *) &rndis_data_intf, | |
224 | (struct usb_descriptor_header *) &fs_in_desc, | |
225 | (struct usb_descriptor_header *) &fs_out_desc, | |
226 | NULL, | |
227 | }; | |
228 | ||
229 | /* high speed support: */ | |
230 | ||
28824b18 | 231 | static struct usb_endpoint_descriptor hs_notify_desc = { |
45fe3b8e DB |
232 | .bLength = USB_DT_ENDPOINT_SIZE, |
233 | .bDescriptorType = USB_DT_ENDPOINT, | |
234 | ||
235 | .bEndpointAddress = USB_DIR_IN, | |
236 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
551509d2 | 237 | .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT), |
bcb2f99c | 238 | .bInterval = USB_MS_TO_HS_INTERVAL(RNDIS_STATUS_INTERVAL_MS) |
45fe3b8e | 239 | }; |
04617db7 | 240 | |
28824b18 | 241 | static struct usb_endpoint_descriptor hs_in_desc = { |
45fe3b8e DB |
242 | .bLength = USB_DT_ENDPOINT_SIZE, |
243 | .bDescriptorType = USB_DT_ENDPOINT, | |
244 | ||
245 | .bEndpointAddress = USB_DIR_IN, | |
246 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 247 | .wMaxPacketSize = cpu_to_le16(512), |
45fe3b8e DB |
248 | }; |
249 | ||
28824b18 | 250 | static struct usb_endpoint_descriptor hs_out_desc = { |
45fe3b8e DB |
251 | .bLength = USB_DT_ENDPOINT_SIZE, |
252 | .bDescriptorType = USB_DT_ENDPOINT, | |
253 | ||
254 | .bEndpointAddress = USB_DIR_OUT, | |
255 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 256 | .wMaxPacketSize = cpu_to_le16(512), |
45fe3b8e DB |
257 | }; |
258 | ||
28824b18 | 259 | static struct usb_descriptor_header *eth_hs_function[] = { |
b97503ff | 260 | (struct usb_descriptor_header *) &rndis_iad_descriptor, |
04617db7 | 261 | |
45fe3b8e DB |
262 | /* control interface matches ACM, not Ethernet */ |
263 | (struct usb_descriptor_header *) &rndis_control_intf, | |
264 | (struct usb_descriptor_header *) &header_desc, | |
265 | (struct usb_descriptor_header *) &call_mgmt_descriptor, | |
b97503ff | 266 | (struct usb_descriptor_header *) &rndis_acm_descriptor, |
45fe3b8e DB |
267 | (struct usb_descriptor_header *) &rndis_union_desc, |
268 | (struct usb_descriptor_header *) &hs_notify_desc, | |
04617db7 | 269 | |
45fe3b8e DB |
270 | /* data interface has no altsetting */ |
271 | (struct usb_descriptor_header *) &rndis_data_intf, | |
272 | (struct usb_descriptor_header *) &hs_in_desc, | |
273 | (struct usb_descriptor_header *) &hs_out_desc, | |
274 | NULL, | |
275 | }; | |
276 | ||
04617db7 PZ |
277 | /* super speed support: */ |
278 | ||
279 | static struct usb_endpoint_descriptor ss_notify_desc = { | |
280 | .bLength = USB_DT_ENDPOINT_SIZE, | |
281 | .bDescriptorType = USB_DT_ENDPOINT, | |
282 | ||
283 | .bEndpointAddress = USB_DIR_IN, | |
284 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
285 | .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT), | |
bcb2f99c | 286 | .bInterval = USB_MS_TO_HS_INTERVAL(RNDIS_STATUS_INTERVAL_MS) |
04617db7 PZ |
287 | }; |
288 | ||
289 | static struct usb_ss_ep_comp_descriptor ss_intr_comp_desc = { | |
290 | .bLength = sizeof ss_intr_comp_desc, | |
291 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
292 | ||
293 | /* the following 3 values can be tweaked if necessary */ | |
294 | /* .bMaxBurst = 0, */ | |
295 | /* .bmAttributes = 0, */ | |
296 | .wBytesPerInterval = cpu_to_le16(STATUS_BYTECOUNT), | |
297 | }; | |
298 | ||
299 | static struct usb_endpoint_descriptor ss_in_desc = { | |
300 | .bLength = USB_DT_ENDPOINT_SIZE, | |
301 | .bDescriptorType = USB_DT_ENDPOINT, | |
302 | ||
303 | .bEndpointAddress = USB_DIR_IN, | |
304 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
305 | .wMaxPacketSize = cpu_to_le16(1024), | |
306 | }; | |
307 | ||
308 | static struct usb_endpoint_descriptor ss_out_desc = { | |
309 | .bLength = USB_DT_ENDPOINT_SIZE, | |
310 | .bDescriptorType = USB_DT_ENDPOINT, | |
311 | ||
312 | .bEndpointAddress = USB_DIR_OUT, | |
313 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
314 | .wMaxPacketSize = cpu_to_le16(1024), | |
315 | }; | |
316 | ||
317 | static struct usb_ss_ep_comp_descriptor ss_bulk_comp_desc = { | |
318 | .bLength = sizeof ss_bulk_comp_desc, | |
319 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
320 | ||
321 | /* the following 2 values can be tweaked if necessary */ | |
322 | /* .bMaxBurst = 0, */ | |
323 | /* .bmAttributes = 0, */ | |
324 | }; | |
325 | ||
326 | static struct usb_descriptor_header *eth_ss_function[] = { | |
327 | (struct usb_descriptor_header *) &rndis_iad_descriptor, | |
328 | ||
329 | /* control interface matches ACM, not Ethernet */ | |
330 | (struct usb_descriptor_header *) &rndis_control_intf, | |
331 | (struct usb_descriptor_header *) &header_desc, | |
332 | (struct usb_descriptor_header *) &call_mgmt_descriptor, | |
333 | (struct usb_descriptor_header *) &rndis_acm_descriptor, | |
334 | (struct usb_descriptor_header *) &rndis_union_desc, | |
335 | (struct usb_descriptor_header *) &ss_notify_desc, | |
336 | (struct usb_descriptor_header *) &ss_intr_comp_desc, | |
337 | ||
338 | /* data interface has no altsetting */ | |
339 | (struct usb_descriptor_header *) &rndis_data_intf, | |
340 | (struct usb_descriptor_header *) &ss_in_desc, | |
341 | (struct usb_descriptor_header *) &ss_bulk_comp_desc, | |
342 | (struct usb_descriptor_header *) &ss_out_desc, | |
343 | (struct usb_descriptor_header *) &ss_bulk_comp_desc, | |
344 | NULL, | |
345 | }; | |
346 | ||
45fe3b8e DB |
347 | /* string descriptors: */ |
348 | ||
349 | static struct usb_string rndis_string_defs[] = { | |
350 | [0].s = "RNDIS Communications Control", | |
351 | [1].s = "RNDIS Ethernet Data", | |
b97503ff | 352 | [2].s = "RNDIS", |
45fe3b8e DB |
353 | { } /* end of list */ |
354 | }; | |
355 | ||
356 | static struct usb_gadget_strings rndis_string_table = { | |
357 | .language = 0x0409, /* en-us */ | |
358 | .strings = rndis_string_defs, | |
359 | }; | |
360 | ||
361 | static struct usb_gadget_strings *rndis_strings[] = { | |
362 | &rndis_string_table, | |
363 | NULL, | |
364 | }; | |
365 | ||
366 | /*-------------------------------------------------------------------------*/ | |
367 | ||
9b39e9dd BN |
368 | static struct sk_buff *rndis_add_header(struct gether *port, |
369 | struct sk_buff *skb) | |
45fe3b8e | 370 | { |
9b39e9dd BN |
371 | struct sk_buff *skb2; |
372 | ||
80d1642d PC |
373 | if (!skb) |
374 | return NULL; | |
375 | ||
9b39e9dd | 376 | skb2 = skb_realloc_headroom(skb, sizeof(struct rndis_packet_msg_type)); |
7b0f000b | 377 | rndis_add_hdr(skb2); |
9b39e9dd | 378 | |
2656c9e2 | 379 | dev_kfree_skb(skb); |
9b39e9dd | 380 | return skb2; |
45fe3b8e DB |
381 | } |
382 | ||
383 | static void rndis_response_available(void *_rndis) | |
384 | { | |
385 | struct f_rndis *rndis = _rndis; | |
386 | struct usb_request *req = rndis->notify_req; | |
387 | struct usb_composite_dev *cdev = rndis->port.func.config->cdev; | |
388 | __le32 *data = req->buf; | |
389 | int status; | |
390 | ||
ff349505 | 391 | if (atomic_inc_return(&rndis->notify_count) != 1) |
45fe3b8e DB |
392 | return; |
393 | ||
394 | /* Send RNDIS RESPONSE_AVAILABLE notification; a | |
395 | * USB_CDC_NOTIFY_RESPONSE_AVAILABLE "should" work too | |
396 | * | |
397 | * This is the only notification defined by RNDIS. | |
398 | */ | |
399 | data[0] = cpu_to_le32(1); | |
400 | data[1] = cpu_to_le32(0); | |
401 | ||
402 | status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC); | |
403 | if (status) { | |
404 | atomic_dec(&rndis->notify_count); | |
405 | DBG(cdev, "notify/0 --> %d\n", status); | |
406 | } | |
407 | } | |
408 | ||
409 | static void rndis_response_complete(struct usb_ep *ep, struct usb_request *req) | |
410 | { | |
411 | struct f_rndis *rndis = req->context; | |
412 | struct usb_composite_dev *cdev = rndis->port.func.config->cdev; | |
413 | int status = req->status; | |
414 | ||
415 | /* after TX: | |
416 | * - USB_CDC_GET_ENCAPSULATED_RESPONSE (ep0/control) | |
417 | * - RNDIS_RESPONSE_AVAILABLE (status/irq) | |
418 | */ | |
419 | switch (status) { | |
420 | case -ECONNRESET: | |
421 | case -ESHUTDOWN: | |
422 | /* connection gone */ | |
423 | atomic_set(&rndis->notify_count, 0); | |
424 | break; | |
425 | default: | |
426 | DBG(cdev, "RNDIS %s response error %d, %d/%d\n", | |
427 | ep->name, status, | |
428 | req->actual, req->length); | |
429 | /* FALLTHROUGH */ | |
430 | case 0: | |
431 | if (ep != rndis->notify) | |
432 | break; | |
433 | ||
434 | /* handle multiple pending RNDIS_RESPONSE_AVAILABLE | |
435 | * notifications by resending until we're done | |
436 | */ | |
437 | if (atomic_dec_and_test(&rndis->notify_count)) | |
438 | break; | |
439 | status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC); | |
440 | if (status) { | |
441 | atomic_dec(&rndis->notify_count); | |
442 | DBG(cdev, "notify/1 --> %d\n", status); | |
443 | } | |
444 | break; | |
445 | } | |
446 | } | |
447 | ||
448 | static void rndis_command_complete(struct usb_ep *ep, struct usb_request *req) | |
449 | { | |
450 | struct f_rndis *rndis = req->context; | |
45fe3b8e DB |
451 | int status; |
452 | ||
453 | /* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */ | |
454 | // spin_lock(&dev->lock); | |
83210e59 | 455 | status = rndis_msg_parser(rndis->params, (u8 *) req->buf); |
45fe3b8e | 456 | if (status < 0) |
967baed4 | 457 | pr_err("RNDIS command error %d, %d/%d\n", |
45fe3b8e DB |
458 | status, req->actual, req->length); |
459 | // spin_unlock(&dev->lock); | |
460 | } | |
461 | ||
462 | static int | |
463 | rndis_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: | |
472b9127 | 483 | if (w_value || w_index != rndis->ctrl_id) |
45fe3b8e DB |
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 */ | |
83210e59 | 501 | buf = rndis_get_next_response(rndis->params, &n); |
45fe3b8e DB |
502 | if (buf) { |
503 | memcpy(req->buf, buf, n); | |
504 | req->complete = rndis_response_complete; | |
f1356172 | 505 | req->context = rndis; |
83210e59 | 506 | rndis_free_response(rndis->params, buf); |
45fe3b8e DB |
507 | value = n; |
508 | } | |
509 | /* else stalls ... spec says to avoid that */ | |
510 | } | |
511 | break; | |
512 | ||
513 | default: | |
514 | invalid: | |
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); | |
090b9011 | 525 | req->zero = (value < w_length); |
45fe3b8e DB |
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 | ||
537 | static 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) { | |
bbc474f7 RB |
545 | VDBG(cdev, "reset rndis control %d\n", intf); |
546 | usb_ep_disable(rndis->notify); | |
547 | ||
ea2a1df7 | 548 | if (!rndis->notify->desc) { |
45fe3b8e | 549 | VDBG(cdev, "init rndis ctrl %d\n", intf); |
ea2a1df7 TB |
550 | if (config_ep_by_speed(cdev->gadget, f, rndis->notify)) |
551 | goto fail; | |
45fe3b8e | 552 | } |
72c973dd | 553 | usb_ep_enable(rndis->notify); |
45fe3b8e DB |
554 | |
555 | } else if (intf == rndis->data_id) { | |
556 | struct net_device *net; | |
557 | ||
bbc474f7 | 558 | if (rndis->port.in_ep->enabled) { |
45fe3b8e DB |
559 | DBG(cdev, "reset rndis\n"); |
560 | gether_disconnect(&rndis->port); | |
830d1b18 MM |
561 | } |
562 | ||
ea2a1df7 | 563 | if (!rndis->port.in_ep->desc || !rndis->port.out_ep->desc) { |
45fe3b8e | 564 | DBG(cdev, "init rndis\n"); |
ea2a1df7 TB |
565 | if (config_ep_by_speed(cdev->gadget, f, |
566 | rndis->port.in_ep) || | |
567 | config_ep_by_speed(cdev->gadget, f, | |
568 | rndis->port.out_ep)) { | |
569 | rndis->port.in_ep->desc = NULL; | |
570 | rndis->port.out_ep->desc = NULL; | |
571 | goto fail; | |
572 | } | |
45fe3b8e DB |
573 | } |
574 | ||
575 | /* Avoid ZLPs; they can be troublesome. */ | |
576 | rndis->port.is_zlp_ok = false; | |
577 | ||
578 | /* RNDIS should be in the "RNDIS uninitialized" state, | |
579 | * either never activated or after rndis_uninit(). | |
580 | * | |
581 | * We don't want data to flow here until a nonzero packet | |
582 | * filter is set, at which point it enters "RNDIS data | |
583 | * initialized" state ... but we do want the endpoints | |
584 | * to be activated. It's a strange little state. | |
585 | * | |
586 | * REVISIT the RNDIS gadget code has done this wrong for a | |
587 | * very long time. We need another call to the link layer | |
588 | * code -- gether_updown(...bool) maybe -- to do it right. | |
589 | */ | |
590 | rndis->port.cdc_filter = 0; | |
591 | ||
592 | DBG(cdev, "RNDIS RX/TX early activation ... \n"); | |
593 | net = gether_connect(&rndis->port); | |
594 | if (IS_ERR(net)) | |
595 | return PTR_ERR(net); | |
596 | ||
83210e59 | 597 | rndis_set_param_dev(rndis->params, net, |
45fe3b8e DB |
598 | &rndis->port.cdc_filter); |
599 | } else | |
600 | goto fail; | |
601 | ||
602 | return 0; | |
603 | fail: | |
604 | return -EINVAL; | |
605 | } | |
606 | ||
607 | static void rndis_disable(struct usb_function *f) | |
608 | { | |
609 | struct f_rndis *rndis = func_to_rndis(f); | |
610 | struct usb_composite_dev *cdev = f->config->cdev; | |
611 | ||
bbc474f7 | 612 | if (!rndis->notify->enabled) |
45fe3b8e DB |
613 | return; |
614 | ||
615 | DBG(cdev, "rndis deactivated\n"); | |
616 | ||
83210e59 | 617 | rndis_uninit(rndis->params); |
45fe3b8e DB |
618 | gether_disconnect(&rndis->port); |
619 | ||
620 | usb_ep_disable(rndis->notify); | |
e5b5da96 | 621 | rndis->notify->desc = NULL; |
45fe3b8e DB |
622 | } |
623 | ||
624 | /*-------------------------------------------------------------------------*/ | |
625 | ||
626 | /* | |
627 | * This isn't quite the same mechanism as CDC Ethernet, since the | |
628 | * notification scheme passes less data, but the same set of link | |
629 | * states must be tested. A key difference is that altsettings are | |
630 | * not used to tell whether the link should send packets or not. | |
631 | */ | |
632 | ||
633 | static void rndis_open(struct gether *geth) | |
634 | { | |
635 | struct f_rndis *rndis = func_to_rndis(&geth->func); | |
636 | struct usb_composite_dev *cdev = geth->func.config->cdev; | |
637 | ||
638 | DBG(cdev, "%s\n", __func__); | |
639 | ||
83210e59 | 640 | rndis_set_param_medium(rndis->params, RNDIS_MEDIUM_802_3, |
45fe3b8e | 641 | bitrate(cdev->gadget) / 100); |
83210e59 | 642 | rndis_signal_connect(rndis->params); |
45fe3b8e DB |
643 | } |
644 | ||
645 | static void rndis_close(struct gether *geth) | |
646 | { | |
647 | struct f_rndis *rndis = func_to_rndis(&geth->func); | |
648 | ||
649 | DBG(geth->func.config->cdev, "%s\n", __func__); | |
650 | ||
83210e59 AP |
651 | rndis_set_param_medium(rndis->params, RNDIS_MEDIUM_802_3, 0); |
652 | rndis_signal_disconnect(rndis->params); | |
45fe3b8e DB |
653 | } |
654 | ||
655 | /*-------------------------------------------------------------------------*/ | |
656 | ||
f466c635 AP |
657 | /* Some controllers can't support RNDIS ... */ |
658 | static inline bool can_support_rndis(struct usb_configuration *c) | |
659 | { | |
660 | /* everything else is *presumably* fine */ | |
661 | return true; | |
662 | } | |
663 | ||
45fe3b8e DB |
664 | /* ethernet function driver setup/binding */ |
665 | ||
28824b18 | 666 | static int |
45fe3b8e DB |
667 | rndis_bind(struct usb_configuration *c, struct usb_function *f) |
668 | { | |
669 | struct usb_composite_dev *cdev = c->cdev; | |
670 | struct f_rndis *rndis = func_to_rndis(f); | |
4e75e727 | 671 | struct usb_string *us; |
45fe3b8e DB |
672 | int status; |
673 | struct usb_ep *ep; | |
674 | ||
f466c635 AP |
675 | struct f_rndis_opts *rndis_opts; |
676 | ||
677 | if (!can_support_rndis(c)) | |
678 | return -EINVAL; | |
679 | ||
680 | rndis_opts = container_of(f->fi, struct f_rndis_opts, func_inst); | |
681 | ||
de7a8d2d AP |
682 | if (cdev->use_os_string) { |
683 | f->os_desc_table = kzalloc(sizeof(*f->os_desc_table), | |
684 | GFP_KERNEL); | |
685 | if (!f->os_desc_table) | |
4683ae86 | 686 | return -ENOMEM; |
de7a8d2d AP |
687 | f->os_desc_n = 1; |
688 | f->os_desc_table[0].os_desc = &rndis_opts->rndis_os_desc; | |
689 | } | |
690 | ||
73517cf4 DL |
691 | rndis_iad_descriptor.bFunctionClass = rndis_opts->class; |
692 | rndis_iad_descriptor.bFunctionSubClass = rndis_opts->subclass; | |
693 | rndis_iad_descriptor.bFunctionProtocol = rndis_opts->protocol; | |
694 | ||
f466c635 AP |
695 | /* |
696 | * in drivers/usb/gadget/configfs.c:configfs_composite_bind() | |
697 | * configurations are bound in sequence with list_for_each_entry, | |
698 | * in each configuration its functions are bound in sequence | |
699 | * with list_for_each_entry, so we assume no race condition | |
700 | * with regard to rndis_opts->bound access | |
701 | */ | |
702 | if (!rndis_opts->bound) { | |
703 | gether_set_gadget(rndis_opts->net, cdev->gadget); | |
704 | status = gether_register_netdev(rndis_opts->net); | |
705 | if (status) | |
de7a8d2d | 706 | goto fail; |
f466c635 AP |
707 | rndis_opts->bound = true; |
708 | } | |
31f89db1 | 709 | |
4e75e727 AP |
710 | us = usb_gstrings_attach(cdev, rndis_strings, |
711 | ARRAY_SIZE(rndis_string_defs)); | |
de7a8d2d AP |
712 | if (IS_ERR(us)) { |
713 | status = PTR_ERR(us); | |
714 | goto fail; | |
715 | } | |
4e75e727 AP |
716 | rndis_control_intf.iInterface = us[0].id; |
717 | rndis_data_intf.iInterface = us[1].id; | |
718 | rndis_iad_descriptor.iFunction = us[2].id; | |
f466c635 | 719 | |
45fe3b8e DB |
720 | /* allocate instance-specific interface IDs */ |
721 | status = usb_interface_id(c, f); | |
722 | if (status < 0) | |
723 | goto fail; | |
724 | rndis->ctrl_id = status; | |
b97503ff | 725 | rndis_iad_descriptor.bFirstInterface = status; |
45fe3b8e DB |
726 | |
727 | rndis_control_intf.bInterfaceNumber = status; | |
728 | rndis_union_desc.bMasterInterface0 = status; | |
729 | ||
45465273 AP |
730 | if (cdev->use_os_string) |
731 | f->os_desc_table[0].if_id = | |
732 | rndis_iad_descriptor.bFirstInterface; | |
733 | ||
45fe3b8e DB |
734 | status = usb_interface_id(c, f); |
735 | if (status < 0) | |
736 | goto fail; | |
737 | rndis->data_id = status; | |
738 | ||
739 | rndis_data_intf.bInterfaceNumber = status; | |
740 | rndis_union_desc.bSlaveInterface0 = status; | |
741 | ||
742 | status = -ENODEV; | |
743 | ||
744 | /* allocate instance-specific endpoints */ | |
745 | ep = usb_ep_autoconfig(cdev->gadget, &fs_in_desc); | |
746 | if (!ep) | |
747 | goto fail; | |
748 | rndis->port.in_ep = ep; | |
45fe3b8e DB |
749 | |
750 | ep = usb_ep_autoconfig(cdev->gadget, &fs_out_desc); | |
751 | if (!ep) | |
752 | goto fail; | |
753 | rndis->port.out_ep = ep; | |
45fe3b8e DB |
754 | |
755 | /* NOTE: a status/notification endpoint is, strictly speaking, | |
756 | * optional. We don't treat it that way though! It's simpler, | |
757 | * and some newer profiles don't treat it as optional. | |
758 | */ | |
759 | ep = usb_ep_autoconfig(cdev->gadget, &fs_notify_desc); | |
760 | if (!ep) | |
761 | goto fail; | |
762 | rndis->notify = ep; | |
45fe3b8e DB |
763 | |
764 | status = -ENOMEM; | |
765 | ||
766 | /* allocate notification request and buffer */ | |
767 | rndis->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
768 | if (!rndis->notify_req) | |
769 | goto fail; | |
770 | rndis->notify_req->buf = kmalloc(STATUS_BYTECOUNT, GFP_KERNEL); | |
771 | if (!rndis->notify_req->buf) | |
772 | goto fail; | |
773 | rndis->notify_req->length = STATUS_BYTECOUNT; | |
774 | rndis->notify_req->context = rndis; | |
775 | rndis->notify_req->complete = rndis_response_complete; | |
776 | ||
45fe3b8e DB |
777 | /* support all relevant hardware speeds... we expect that when |
778 | * hardware is dual speed, all bulk-capable endpoints work at | |
779 | * both speeds | |
780 | */ | |
10287bae SAS |
781 | hs_in_desc.bEndpointAddress = fs_in_desc.bEndpointAddress; |
782 | hs_out_desc.bEndpointAddress = fs_out_desc.bEndpointAddress; | |
783 | hs_notify_desc.bEndpointAddress = fs_notify_desc.bEndpointAddress; | |
45fe3b8e | 784 | |
10287bae SAS |
785 | ss_in_desc.bEndpointAddress = fs_in_desc.bEndpointAddress; |
786 | ss_out_desc.bEndpointAddress = fs_out_desc.bEndpointAddress; | |
787 | ss_notify_desc.bEndpointAddress = fs_notify_desc.bEndpointAddress; | |
788 | ||
789 | status = usb_assign_descriptors(f, eth_fs_function, eth_hs_function, | |
eaef50c7 | 790 | eth_ss_function, NULL); |
10287bae SAS |
791 | if (status) |
792 | goto fail; | |
04617db7 | 793 | |
45fe3b8e DB |
794 | rndis->port.open = rndis_open; |
795 | rndis->port.close = rndis_close; | |
796 | ||
83210e59 AP |
797 | rndis_set_param_medium(rndis->params, RNDIS_MEDIUM_802_3, 0); |
798 | rndis_set_host_mac(rndis->params, rndis->ethaddr); | |
45fe3b8e | 799 | |
1fbfeff9 | 800 | if (rndis->manufacturer && rndis->vendorID && |
83210e59 | 801 | rndis_set_param_vendor(rndis->params, rndis->vendorID, |
9b176355 PM |
802 | rndis->manufacturer)) { |
803 | status = -EINVAL; | |
d12a8727 | 804 | goto fail_free_descs; |
9b176355 | 805 | } |
45fe3b8e DB |
806 | |
807 | /* NOTE: all that is done without knowing or caring about | |
808 | * the network link ... which is unavailable to this code | |
809 | * until we're activated via set_alt(). | |
810 | */ | |
811 | ||
812 | DBG(cdev, "RNDIS: %s speed IN/%s OUT/%s NOTIFY/%s\n", | |
04617db7 | 813 | gadget_is_superspeed(c->cdev->gadget) ? "super" : |
45fe3b8e DB |
814 | gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", |
815 | rndis->port.in_ep->name, rndis->port.out_ep->name, | |
816 | rndis->notify->name); | |
817 | return 0; | |
818 | ||
d12a8727 PM |
819 | fail_free_descs: |
820 | usb_free_all_descriptors(f); | |
45fe3b8e | 821 | fail: |
de7a8d2d AP |
822 | kfree(f->os_desc_table); |
823 | f->os_desc_n = 0; | |
45fe3b8e DB |
824 | |
825 | if (rndis->notify_req) { | |
826 | kfree(rndis->notify_req->buf); | |
827 | usb_ep_free_request(rndis->notify, rndis->notify_req); | |
828 | } | |
829 | ||
45fe3b8e DB |
830 | ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); |
831 | ||
832 | return status; | |
833 | } | |
834 | ||
f466c635 AP |
835 | void rndis_borrow_net(struct usb_function_instance *f, struct net_device *net) |
836 | { | |
837 | struct f_rndis_opts *opts; | |
838 | ||
839 | opts = container_of(f, struct f_rndis_opts, func_inst); | |
840 | if (opts->bound) | |
841 | gether_cleanup(netdev_priv(opts->net)); | |
842 | else | |
843 | free_netdev(opts->net); | |
844 | opts->borrowed_net = opts->bound = true; | |
845 | opts->net = net; | |
846 | } | |
0700faaf | 847 | EXPORT_SYMBOL_GPL(rndis_borrow_net); |
f466c635 | 848 | |
b3df2faa AP |
849 | static inline struct f_rndis_opts *to_f_rndis_opts(struct config_item *item) |
850 | { | |
851 | return container_of(to_config_group(item), struct f_rndis_opts, | |
852 | func_inst.group); | |
853 | } | |
854 | ||
855 | /* f_rndis_item_ops */ | |
856 | USB_ETHERNET_CONFIGFS_ITEM(rndis); | |
857 | ||
858 | /* f_rndis_opts_dev_addr */ | |
859 | USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(rndis); | |
860 | ||
861 | /* f_rndis_opts_host_addr */ | |
862 | USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(rndis); | |
863 | ||
864 | /* f_rndis_opts_qmult */ | |
865 | USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(rndis); | |
866 | ||
867 | /* f_rndis_opts_ifname */ | |
868 | USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(rndis); | |
869 | ||
73517cf4 DL |
870 | /* f_rndis_opts_class */ |
871 | USB_ETHER_CONFIGFS_ITEM_ATTR_U8_RW(rndis, class); | |
872 | ||
873 | /* f_rndis_opts_subclass */ | |
874 | USB_ETHER_CONFIGFS_ITEM_ATTR_U8_RW(rndis, subclass); | |
875 | ||
876 | /* f_rndis_opts_protocol */ | |
877 | USB_ETHER_CONFIGFS_ITEM_ATTR_U8_RW(rndis, protocol); | |
878 | ||
b3df2faa | 879 | static struct configfs_attribute *rndis_attrs[] = { |
f9a63da3 CH |
880 | &rndis_opts_attr_dev_addr, |
881 | &rndis_opts_attr_host_addr, | |
882 | &rndis_opts_attr_qmult, | |
883 | &rndis_opts_attr_ifname, | |
73517cf4 DL |
884 | &rndis_opts_attr_class, |
885 | &rndis_opts_attr_subclass, | |
886 | &rndis_opts_attr_protocol, | |
b3df2faa AP |
887 | NULL, |
888 | }; | |
889 | ||
97363902 | 890 | static const struct config_item_type rndis_func_type = { |
b3df2faa AP |
891 | .ct_item_ops = &rndis_item_ops, |
892 | .ct_attrs = rndis_attrs, | |
893 | .ct_owner = THIS_MODULE, | |
894 | }; | |
895 | ||
f466c635 AP |
896 | static void rndis_free_inst(struct usb_function_instance *f) |
897 | { | |
898 | struct f_rndis_opts *opts; | |
899 | ||
900 | opts = container_of(f, struct f_rndis_opts, func_inst); | |
901 | if (!opts->borrowed_net) { | |
902 | if (opts->bound) | |
903 | gether_cleanup(netdev_priv(opts->net)); | |
904 | else | |
905 | free_netdev(opts->net); | |
906 | } | |
a747b095 | 907 | |
ff74745e | 908 | kfree(opts->rndis_interf_group); /* single VLA chunk */ |
f466c635 AP |
909 | kfree(opts); |
910 | } | |
911 | ||
912 | static struct usb_function_instance *rndis_alloc_inst(void) | |
913 | { | |
914 | struct f_rndis_opts *opts; | |
a747b095 | 915 | struct usb_os_desc *descs[1]; |
14574b54 | 916 | char *names[1]; |
ff74745e | 917 | struct config_group *rndis_interf_group; |
f466c635 AP |
918 | |
919 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
920 | if (!opts) | |
921 | return ERR_PTR(-ENOMEM); | |
de7a8d2d AP |
922 | opts->rndis_os_desc.ext_compat_id = opts->rndis_ext_compat_id; |
923 | ||
b3df2faa | 924 | mutex_init(&opts->lock); |
f466c635 AP |
925 | opts->func_inst.free_func_inst = rndis_free_inst; |
926 | opts->net = gether_setup_default(); | |
172d934c AP |
927 | if (IS_ERR(opts->net)) { |
928 | struct net_device *net = opts->net; | |
929 | kfree(opts); | |
930 | return ERR_CAST(net); | |
931 | } | |
de7a8d2d | 932 | INIT_LIST_HEAD(&opts->rndis_os_desc.ext_prop); |
f466c635 | 933 | |
73517cf4 DL |
934 | opts->class = rndis_iad_descriptor.bFunctionClass; |
935 | opts->subclass = rndis_iad_descriptor.bFunctionSubClass; | |
936 | opts->protocol = rndis_iad_descriptor.bFunctionProtocol; | |
937 | ||
a747b095 | 938 | descs[0] = &opts->rndis_os_desc; |
14574b54 | 939 | names[0] = "rndis"; |
b3df2faa AP |
940 | config_group_init_type_name(&opts->func_inst.group, "", |
941 | &rndis_func_type); | |
ff74745e AG |
942 | rndis_interf_group = |
943 | usb_os_desc_prepare_interf_dir(&opts->func_inst.group, 1, descs, | |
944 | names, THIS_MODULE); | |
945 | if (IS_ERR(rndis_interf_group)) { | |
946 | rndis_free_inst(&opts->func_inst); | |
947 | return ERR_CAST(rndis_interf_group); | |
948 | } | |
949 | opts->rndis_interf_group = rndis_interf_group; | |
b3df2faa | 950 | |
f466c635 AP |
951 | return &opts->func_inst; |
952 | } | |
953 | ||
954 | static void rndis_free(struct usb_function *f) | |
955 | { | |
956 | struct f_rndis *rndis; | |
b3df2faa | 957 | struct f_rndis_opts *opts; |
f466c635 AP |
958 | |
959 | rndis = func_to_rndis(f); | |
83210e59 | 960 | rndis_deregister(rndis->params); |
b3df2faa | 961 | opts = container_of(f->fi, struct f_rndis_opts, func_inst); |
f466c635 | 962 | kfree(rndis); |
b3df2faa AP |
963 | mutex_lock(&opts->lock); |
964 | opts->refcnt--; | |
965 | mutex_unlock(&opts->lock); | |
f466c635 AP |
966 | } |
967 | ||
968 | static void rndis_unbind(struct usb_configuration *c, struct usb_function *f) | |
969 | { | |
970 | struct f_rndis *rndis = func_to_rndis(f); | |
971 | ||
de7a8d2d AP |
972 | kfree(f->os_desc_table); |
973 | f->os_desc_n = 0; | |
f466c635 AP |
974 | usb_free_all_descriptors(f); |
975 | ||
976 | kfree(rndis->notify_req->buf); | |
977 | usb_ep_free_request(rndis->notify, rndis->notify_req); | |
978 | } | |
979 | ||
980 | static struct usb_function *rndis_alloc(struct usb_function_instance *fi) | |
981 | { | |
982 | struct f_rndis *rndis; | |
983 | struct f_rndis_opts *opts; | |
83210e59 | 984 | struct rndis_params *params; |
f466c635 AP |
985 | |
986 | /* allocate and initialize one new instance */ | |
987 | rndis = kzalloc(sizeof(*rndis), GFP_KERNEL); | |
76da66d1 | 988 | if (!rndis) |
f466c635 | 989 | return ERR_PTR(-ENOMEM); |
f466c635 AP |
990 | |
991 | opts = container_of(fi, struct f_rndis_opts, func_inst); | |
b3df2faa AP |
992 | mutex_lock(&opts->lock); |
993 | opts->refcnt++; | |
f466c635 AP |
994 | |
995 | gether_get_host_addr_u8(opts->net, rndis->ethaddr); | |
996 | rndis->vendorID = opts->vendor_id; | |
997 | rndis->manufacturer = opts->manufacturer; | |
998 | ||
999 | rndis->port.ioport = netdev_priv(opts->net); | |
b3df2faa | 1000 | mutex_unlock(&opts->lock); |
f466c635 AP |
1001 | /* RNDIS activates when the host changes this filter */ |
1002 | rndis->port.cdc_filter = 0; | |
1003 | ||
1004 | /* RNDIS has special (and complex) framing */ | |
1005 | rndis->port.header_len = sizeof(struct rndis_packet_msg_type); | |
1006 | rndis->port.wrap = rndis_add_header; | |
1007 | rndis->port.unwrap = rndis_rm_hdr; | |
1008 | ||
1009 | rndis->port.func.name = "rndis"; | |
f466c635 AP |
1010 | /* descriptors are per-instance copies */ |
1011 | rndis->port.func.bind = rndis_bind; | |
1012 | rndis->port.func.unbind = rndis_unbind; | |
1013 | rndis->port.func.set_alt = rndis_set_alt; | |
1014 | rndis->port.func.setup = rndis_setup; | |
1015 | rndis->port.func.disable = rndis_disable; | |
1016 | rndis->port.func.free_func = rndis_free; | |
1017 | ||
83210e59 AP |
1018 | params = rndis_register(rndis_response_available, rndis); |
1019 | if (IS_ERR(params)) { | |
f466c635 | 1020 | kfree(rndis); |
83210e59 | 1021 | return ERR_CAST(params); |
f466c635 | 1022 | } |
83210e59 | 1023 | rndis->params = params; |
f466c635 AP |
1024 | |
1025 | return &rndis->port.func; | |
1026 | } | |
1027 | ||
d6d22922 | 1028 | DECLARE_USB_FUNCTION_INIT(rndis, rndis_alloc_inst, rndis_alloc); |
f466c635 AP |
1029 | MODULE_LICENSE("GPL"); |
1030 | MODULE_AUTHOR("David Brownell"); |