2 * f_rndis.c -- RNDIS link function driver
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)
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.
16 /* #define VERBOSE_DEBUG */
18 #include <linux/slab.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/device.h>
22 #include <linux/etherdevice.h>
24 #include <linux/atomic.h>
27 #include "u_ether_configfs.h"
33 * This function is an RNDIS Ethernet port -- a Microsoft protocol that's
34 * been promoted instead of the standard CDC Ethernet. The published RNDIS
35 * spec is ambiguous, incomplete, and needlessly complex. Variants such as
36 * ActiveSync have even worse status in terms of specification.
38 * In short: it's a protocol controlled by (and for) Microsoft, not for an
39 * Open ecosystem or markets. Linux supports it *only* because Microsoft
40 * doesn't support the CDC Ethernet standard.
42 * The RNDIS data transfer model is complex, with multiple Ethernet packets
43 * per USB message, and out of band data. The control model is built around
44 * what's essentially an "RNDIS RPC" protocol. It's all wrapped in a CDC ACM
45 * (modem, not Ethernet) veneer, with those ACM descriptors being entirely
46 * useless (they're ignored). RNDIS expects to be the only function in its
47 * configuration, so it's no real help if you need composite devices; and
48 * it expects to be the first configuration too.
50 * There is a single technical advantage of RNDIS over CDC Ethernet, if you
51 * discount the fluff that its RPC can be made to deliver: it doesn't need
52 * a NOP altsetting for the data interface. That lets it work on some of the
53 * "so smart it's stupid" hardware which takes over configuration changes
54 * from the software, and adds restrictions like "no altsettings".
56 * Unfortunately MSFT's RNDIS drivers are buggy. They hang or oops, and
57 * have all sorts of contrary-to-specification oddities that can prevent
58 * them from working sanely. Since bugfixes (or accurate specs, letting
59 * Linux work around those bugs) are unlikely to ever come from MSFT, you
60 * may want to avoid using RNDIS on purely operational grounds.
62 * Omissions from the RNDIS 1.0 specification include:
64 * - Power management ... references data that's scattered around lots
65 * of other documentation, which is incorrect/incomplete there too.
67 * - There are various undocumented protocol requirements, like the need
68 * to send garbage in some control-OUT messages.
70 * - MS-Windows drivers sometimes emit undocumented requests.
78 const char *manufacturer;
79 struct rndis_params *params;
81 struct usb_ep *notify;
82 struct usb_request *notify_req;
83 atomic_t notify_count;
86 static inline struct f_rndis *func_to_rndis(struct usb_function *f)
88 return container_of(f, struct f_rndis, port.func);
91 /* peak (theoretical) bulk transfer rate in bits-per-second */
92 static unsigned int bitrate(struct usb_gadget *g)
94 if (gadget_is_superspeed(g) && g->speed >= USB_SPEED_SUPER_PLUS)
96 if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER)
98 else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
99 return 13 * 512 * 8 * 1000 * 8;
101 return 19 * 64 * 1 * 1000 * 8;
104 /*-------------------------------------------------------------------------*/
109 #define RNDIS_STATUS_INTERVAL_MS 32
110 #define STATUS_BYTECOUNT 8 /* 8 bytes data */
113 /* interface descriptor: */
115 static struct usb_interface_descriptor rndis_control_intf = {
116 .bLength = sizeof rndis_control_intf,
117 .bDescriptorType = USB_DT_INTERFACE,
119 /* .bInterfaceNumber = DYNAMIC */
120 /* status endpoint is optional; this could be patched later */
122 .bInterfaceClass = USB_CLASS_COMM,
123 .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
124 .bInterfaceProtocol = USB_CDC_ACM_PROTO_VENDOR,
125 /* .iInterface = DYNAMIC */
128 static struct usb_cdc_header_desc header_desc = {
129 .bLength = sizeof header_desc,
130 .bDescriptorType = USB_DT_CS_INTERFACE,
131 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
133 .bcdCDC = cpu_to_le16(0x0110),
136 static struct usb_cdc_call_mgmt_descriptor call_mgmt_descriptor = {
137 .bLength = sizeof call_mgmt_descriptor,
138 .bDescriptorType = USB_DT_CS_INTERFACE,
139 .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
141 .bmCapabilities = 0x00,
142 .bDataInterface = 0x01,
145 static struct usb_cdc_acm_descriptor rndis_acm_descriptor = {
146 .bLength = sizeof rndis_acm_descriptor,
147 .bDescriptorType = USB_DT_CS_INTERFACE,
148 .bDescriptorSubType = USB_CDC_ACM_TYPE,
150 .bmCapabilities = 0x00,
153 static struct usb_cdc_union_desc rndis_union_desc = {
154 .bLength = sizeof(rndis_union_desc),
155 .bDescriptorType = USB_DT_CS_INTERFACE,
156 .bDescriptorSubType = USB_CDC_UNION_TYPE,
157 /* .bMasterInterface0 = DYNAMIC */
158 /* .bSlaveInterface0 = DYNAMIC */
161 /* the data interface has two bulk endpoints */
163 static struct usb_interface_descriptor rndis_data_intf = {
164 .bLength = sizeof rndis_data_intf,
165 .bDescriptorType = USB_DT_INTERFACE,
167 /* .bInterfaceNumber = DYNAMIC */
169 .bInterfaceClass = USB_CLASS_CDC_DATA,
170 .bInterfaceSubClass = 0,
171 .bInterfaceProtocol = 0,
172 /* .iInterface = DYNAMIC */
176 static struct usb_interface_assoc_descriptor
177 rndis_iad_descriptor = {
178 .bLength = sizeof rndis_iad_descriptor,
179 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
181 .bFirstInterface = 0, /* XXX, hardcoded */
182 .bInterfaceCount = 2, // control + data
183 .bFunctionClass = USB_CLASS_COMM,
184 .bFunctionSubClass = USB_CDC_SUBCLASS_ETHERNET,
185 .bFunctionProtocol = USB_CDC_PROTO_NONE,
186 /* .iFunction = DYNAMIC */
189 /* full speed support: */
191 static struct usb_endpoint_descriptor fs_notify_desc = {
192 .bLength = USB_DT_ENDPOINT_SIZE,
193 .bDescriptorType = USB_DT_ENDPOINT,
195 .bEndpointAddress = USB_DIR_IN,
196 .bmAttributes = USB_ENDPOINT_XFER_INT,
197 .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT),
198 .bInterval = RNDIS_STATUS_INTERVAL_MS,
201 static struct usb_endpoint_descriptor fs_in_desc = {
202 .bLength = USB_DT_ENDPOINT_SIZE,
203 .bDescriptorType = USB_DT_ENDPOINT,
205 .bEndpointAddress = USB_DIR_IN,
206 .bmAttributes = USB_ENDPOINT_XFER_BULK,
209 static struct usb_endpoint_descriptor fs_out_desc = {
210 .bLength = USB_DT_ENDPOINT_SIZE,
211 .bDescriptorType = USB_DT_ENDPOINT,
213 .bEndpointAddress = USB_DIR_OUT,
214 .bmAttributes = USB_ENDPOINT_XFER_BULK,
217 static struct usb_descriptor_header *eth_fs_function[] = {
218 (struct usb_descriptor_header *) &rndis_iad_descriptor,
220 /* control interface matches ACM, not Ethernet */
221 (struct usb_descriptor_header *) &rndis_control_intf,
222 (struct usb_descriptor_header *) &header_desc,
223 (struct usb_descriptor_header *) &call_mgmt_descriptor,
224 (struct usb_descriptor_header *) &rndis_acm_descriptor,
225 (struct usb_descriptor_header *) &rndis_union_desc,
226 (struct usb_descriptor_header *) &fs_notify_desc,
228 /* data interface has no altsetting */
229 (struct usb_descriptor_header *) &rndis_data_intf,
230 (struct usb_descriptor_header *) &fs_in_desc,
231 (struct usb_descriptor_header *) &fs_out_desc,
235 /* high speed support: */
237 static struct usb_endpoint_descriptor hs_notify_desc = {
238 .bLength = USB_DT_ENDPOINT_SIZE,
239 .bDescriptorType = USB_DT_ENDPOINT,
241 .bEndpointAddress = USB_DIR_IN,
242 .bmAttributes = USB_ENDPOINT_XFER_INT,
243 .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT),
244 .bInterval = USB_MS_TO_HS_INTERVAL(RNDIS_STATUS_INTERVAL_MS)
247 static struct usb_endpoint_descriptor hs_in_desc = {
248 .bLength = USB_DT_ENDPOINT_SIZE,
249 .bDescriptorType = USB_DT_ENDPOINT,
251 .bEndpointAddress = USB_DIR_IN,
252 .bmAttributes = USB_ENDPOINT_XFER_BULK,
253 .wMaxPacketSize = cpu_to_le16(512),
256 static struct usb_endpoint_descriptor hs_out_desc = {
257 .bLength = USB_DT_ENDPOINT_SIZE,
258 .bDescriptorType = USB_DT_ENDPOINT,
260 .bEndpointAddress = USB_DIR_OUT,
261 .bmAttributes = USB_ENDPOINT_XFER_BULK,
262 .wMaxPacketSize = cpu_to_le16(512),
265 static struct usb_descriptor_header *eth_hs_function[] = {
266 (struct usb_descriptor_header *) &rndis_iad_descriptor,
268 /* control interface matches ACM, not Ethernet */
269 (struct usb_descriptor_header *) &rndis_control_intf,
270 (struct usb_descriptor_header *) &header_desc,
271 (struct usb_descriptor_header *) &call_mgmt_descriptor,
272 (struct usb_descriptor_header *) &rndis_acm_descriptor,
273 (struct usb_descriptor_header *) &rndis_union_desc,
274 (struct usb_descriptor_header *) &hs_notify_desc,
276 /* data interface has no altsetting */
277 (struct usb_descriptor_header *) &rndis_data_intf,
278 (struct usb_descriptor_header *) &hs_in_desc,
279 (struct usb_descriptor_header *) &hs_out_desc,
283 /* super speed support: */
285 static struct usb_endpoint_descriptor ss_notify_desc = {
286 .bLength = USB_DT_ENDPOINT_SIZE,
287 .bDescriptorType = USB_DT_ENDPOINT,
289 .bEndpointAddress = USB_DIR_IN,
290 .bmAttributes = USB_ENDPOINT_XFER_INT,
291 .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT),
292 .bInterval = USB_MS_TO_HS_INTERVAL(RNDIS_STATUS_INTERVAL_MS)
295 static struct usb_ss_ep_comp_descriptor ss_intr_comp_desc = {
296 .bLength = sizeof ss_intr_comp_desc,
297 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
299 /* the following 3 values can be tweaked if necessary */
300 /* .bMaxBurst = 0, */
301 /* .bmAttributes = 0, */
302 .wBytesPerInterval = cpu_to_le16(STATUS_BYTECOUNT),
305 static struct usb_endpoint_descriptor ss_in_desc = {
306 .bLength = USB_DT_ENDPOINT_SIZE,
307 .bDescriptorType = USB_DT_ENDPOINT,
309 .bEndpointAddress = USB_DIR_IN,
310 .bmAttributes = USB_ENDPOINT_XFER_BULK,
311 .wMaxPacketSize = cpu_to_le16(1024),
314 static struct usb_endpoint_descriptor ss_out_desc = {
315 .bLength = USB_DT_ENDPOINT_SIZE,
316 .bDescriptorType = USB_DT_ENDPOINT,
318 .bEndpointAddress = USB_DIR_OUT,
319 .bmAttributes = USB_ENDPOINT_XFER_BULK,
320 .wMaxPacketSize = cpu_to_le16(1024),
323 static struct usb_ss_ep_comp_descriptor ss_bulk_comp_desc = {
324 .bLength = sizeof ss_bulk_comp_desc,
325 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
327 /* the following 2 values can be tweaked if necessary */
328 /* .bMaxBurst = 0, */
329 /* .bmAttributes = 0, */
332 static struct usb_descriptor_header *eth_ss_function[] = {
333 (struct usb_descriptor_header *) &rndis_iad_descriptor,
335 /* control interface matches ACM, not Ethernet */
336 (struct usb_descriptor_header *) &rndis_control_intf,
337 (struct usb_descriptor_header *) &header_desc,
338 (struct usb_descriptor_header *) &call_mgmt_descriptor,
339 (struct usb_descriptor_header *) &rndis_acm_descriptor,
340 (struct usb_descriptor_header *) &rndis_union_desc,
341 (struct usb_descriptor_header *) &ss_notify_desc,
342 (struct usb_descriptor_header *) &ss_intr_comp_desc,
344 /* data interface has no altsetting */
345 (struct usb_descriptor_header *) &rndis_data_intf,
346 (struct usb_descriptor_header *) &ss_in_desc,
347 (struct usb_descriptor_header *) &ss_bulk_comp_desc,
348 (struct usb_descriptor_header *) &ss_out_desc,
349 (struct usb_descriptor_header *) &ss_bulk_comp_desc,
353 /* string descriptors: */
355 static struct usb_string rndis_string_defs[] = {
356 [0].s = "RNDIS Communications Control",
357 [1].s = "RNDIS Ethernet Data",
359 { } /* end of list */
362 static struct usb_gadget_strings rndis_string_table = {
363 .language = 0x0409, /* en-us */
364 .strings = rndis_string_defs,
367 static struct usb_gadget_strings *rndis_strings[] = {
372 /*-------------------------------------------------------------------------*/
374 static struct sk_buff *rndis_add_header(struct gether *port,
377 struct sk_buff *skb2;
382 skb2 = skb_realloc_headroom(skb, sizeof(struct rndis_packet_msg_type));
389 static void rndis_response_available(void *_rndis)
391 struct f_rndis *rndis = _rndis;
392 struct usb_request *req = rndis->notify_req;
393 struct usb_composite_dev *cdev = rndis->port.func.config->cdev;
394 __le32 *data = req->buf;
397 if (atomic_inc_return(&rndis->notify_count) != 1)
400 /* Send RNDIS RESPONSE_AVAILABLE notification; a
401 * USB_CDC_NOTIFY_RESPONSE_AVAILABLE "should" work too
403 * This is the only notification defined by RNDIS.
405 data[0] = cpu_to_le32(1);
406 data[1] = cpu_to_le32(0);
408 status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC);
410 atomic_dec(&rndis->notify_count);
411 DBG(cdev, "notify/0 --> %d\n", status);
415 static void rndis_response_complete(struct usb_ep *ep, struct usb_request *req)
417 struct f_rndis *rndis = req->context;
418 struct usb_composite_dev *cdev = rndis->port.func.config->cdev;
419 int status = req->status;
422 * - USB_CDC_GET_ENCAPSULATED_RESPONSE (ep0/control)
423 * - RNDIS_RESPONSE_AVAILABLE (status/irq)
428 /* connection gone */
429 atomic_set(&rndis->notify_count, 0);
432 DBG(cdev, "RNDIS %s response error %d, %d/%d\n",
434 req->actual, req->length);
437 if (ep != rndis->notify)
440 /* handle multiple pending RNDIS_RESPONSE_AVAILABLE
441 * notifications by resending until we're done
443 if (atomic_dec_and_test(&rndis->notify_count))
445 status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC);
447 atomic_dec(&rndis->notify_count);
448 DBG(cdev, "notify/1 --> %d\n", status);
454 static void rndis_command_complete(struct usb_ep *ep, struct usb_request *req)
456 struct f_rndis *rndis = req->context;
459 /* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */
460 // spin_lock(&dev->lock);
461 status = rndis_msg_parser(rndis->params, (u8 *) req->buf);
463 pr_err("RNDIS command error %d, %d/%d\n",
464 status, req->actual, req->length);
465 // spin_unlock(&dev->lock);
469 rndis_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
471 struct f_rndis *rndis = func_to_rndis(f);
472 struct usb_composite_dev *cdev = f->config->cdev;
473 struct usb_request *req = cdev->req;
474 int value = -EOPNOTSUPP;
475 u16 w_index = le16_to_cpu(ctrl->wIndex);
476 u16 w_value = le16_to_cpu(ctrl->wValue);
477 u16 w_length = le16_to_cpu(ctrl->wLength);
479 /* composite driver infrastructure handles everything except
480 * CDC class messages; interface activation uses set_alt().
482 switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
484 /* RNDIS uses the CDC command encapsulation mechanism to implement
485 * an RPC scheme, with much getting/setting of attributes by OID.
487 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
488 | USB_CDC_SEND_ENCAPSULATED_COMMAND:
489 if (w_value || w_index != rndis->ctrl_id)
491 /* read the request; process it later */
493 req->complete = rndis_command_complete;
494 req->context = rndis;
495 /* later, rndis_response_available() sends a notification */
498 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
499 | USB_CDC_GET_ENCAPSULATED_RESPONSE:
500 if (w_value || w_index != rndis->ctrl_id)
506 /* return the result */
507 buf = rndis_get_next_response(rndis->params, &n);
509 memcpy(req->buf, buf, n);
510 req->complete = rndis_response_complete;
511 req->context = rndis;
512 rndis_free_response(rndis->params, buf);
515 /* else stalls ... spec says to avoid that */
521 VDBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
522 ctrl->bRequestType, ctrl->bRequest,
523 w_value, w_index, w_length);
526 /* respond with data transfer or status phase? */
528 DBG(cdev, "rndis req%02x.%02x v%04x i%04x l%d\n",
529 ctrl->bRequestType, ctrl->bRequest,
530 w_value, w_index, w_length);
531 req->zero = (value < w_length);
533 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
535 ERROR(cdev, "rndis response on err %d\n", value);
538 /* device either stalls (value < 0) or reports success */
543 static int rndis_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
545 struct f_rndis *rndis = func_to_rndis(f);
546 struct usb_composite_dev *cdev = f->config->cdev;
548 /* we know alt == 0 */
550 if (intf == rndis->ctrl_id) {
551 VDBG(cdev, "reset rndis control %d\n", intf);
552 usb_ep_disable(rndis->notify);
554 if (!rndis->notify->desc) {
555 VDBG(cdev, "init rndis ctrl %d\n", intf);
556 if (config_ep_by_speed(cdev->gadget, f, rndis->notify))
559 usb_ep_enable(rndis->notify);
561 } else if (intf == rndis->data_id) {
562 struct net_device *net;
564 if (rndis->port.in_ep->enabled) {
565 DBG(cdev, "reset rndis\n");
566 gether_disconnect(&rndis->port);
569 if (!rndis->port.in_ep->desc || !rndis->port.out_ep->desc) {
570 DBG(cdev, "init rndis\n");
571 if (config_ep_by_speed(cdev->gadget, f,
572 rndis->port.in_ep) ||
573 config_ep_by_speed(cdev->gadget, f,
574 rndis->port.out_ep)) {
575 rndis->port.in_ep->desc = NULL;
576 rndis->port.out_ep->desc = NULL;
581 /* Avoid ZLPs; they can be troublesome. */
582 rndis->port.is_zlp_ok = false;
584 /* RNDIS should be in the "RNDIS uninitialized" state,
585 * either never activated or after rndis_uninit().
587 * We don't want data to flow here until a nonzero packet
588 * filter is set, at which point it enters "RNDIS data
589 * initialized" state ... but we do want the endpoints
590 * to be activated. It's a strange little state.
592 * REVISIT the RNDIS gadget code has done this wrong for a
593 * very long time. We need another call to the link layer
594 * code -- gether_updown(...bool) maybe -- to do it right.
596 rndis->port.cdc_filter = 0;
598 DBG(cdev, "RNDIS RX/TX early activation ... \n");
599 net = gether_connect(&rndis->port);
603 rndis_set_param_dev(rndis->params, net,
604 &rndis->port.cdc_filter);
613 static void rndis_disable(struct usb_function *f)
615 struct f_rndis *rndis = func_to_rndis(f);
616 struct usb_composite_dev *cdev = f->config->cdev;
618 if (!rndis->notify->enabled)
621 DBG(cdev, "rndis deactivated\n");
623 rndis_uninit(rndis->params);
624 gether_disconnect(&rndis->port);
626 usb_ep_disable(rndis->notify);
627 rndis->notify->desc = NULL;
630 /*-------------------------------------------------------------------------*/
633 * This isn't quite the same mechanism as CDC Ethernet, since the
634 * notification scheme passes less data, but the same set of link
635 * states must be tested. A key difference is that altsettings are
636 * not used to tell whether the link should send packets or not.
639 static void rndis_open(struct gether *geth)
641 struct f_rndis *rndis = func_to_rndis(&geth->func);
642 struct usb_composite_dev *cdev = geth->func.config->cdev;
644 DBG(cdev, "%s\n", __func__);
646 rndis_set_param_medium(rndis->params, RNDIS_MEDIUM_802_3,
647 bitrate(cdev->gadget) / 100);
648 rndis_signal_connect(rndis->params);
651 static void rndis_close(struct gether *geth)
653 struct f_rndis *rndis = func_to_rndis(&geth->func);
655 DBG(geth->func.config->cdev, "%s\n", __func__);
657 rndis_set_param_medium(rndis->params, RNDIS_MEDIUM_802_3, 0);
658 rndis_signal_disconnect(rndis->params);
661 /*-------------------------------------------------------------------------*/
663 /* Some controllers can't support RNDIS ... */
664 static inline bool can_support_rndis(struct usb_configuration *c)
666 /* everything else is *presumably* fine */
670 /* ethernet function driver setup/binding */
673 rndis_bind(struct usb_configuration *c, struct usb_function *f)
675 struct usb_composite_dev *cdev = c->cdev;
676 struct f_rndis *rndis = func_to_rndis(f);
677 struct usb_string *us;
681 struct f_rndis_opts *rndis_opts;
683 if (!can_support_rndis(c))
686 rndis_opts = container_of(f->fi, struct f_rndis_opts, func_inst);
688 if (cdev->use_os_string) {
689 f->os_desc_table = kzalloc(sizeof(*f->os_desc_table),
691 if (!f->os_desc_table)
694 f->os_desc_table[0].os_desc = &rndis_opts->rndis_os_desc;
697 rndis_iad_descriptor.bFunctionClass = rndis_opts->class;
698 rndis_iad_descriptor.bFunctionSubClass = rndis_opts->subclass;
699 rndis_iad_descriptor.bFunctionProtocol = rndis_opts->protocol;
702 * in drivers/usb/gadget/configfs.c:configfs_composite_bind()
703 * configurations are bound in sequence with list_for_each_entry,
704 * in each configuration its functions are bound in sequence
705 * with list_for_each_entry, so we assume no race condition
706 * with regard to rndis_opts->bound access
708 if (!rndis_opts->bound) {
709 gether_set_gadget(rndis_opts->net, cdev->gadget);
710 status = gether_register_netdev(rndis_opts->net);
713 rndis_opts->bound = true;
716 us = usb_gstrings_attach(cdev, rndis_strings,
717 ARRAY_SIZE(rndis_string_defs));
719 status = PTR_ERR(us);
722 rndis_control_intf.iInterface = us[0].id;
723 rndis_data_intf.iInterface = us[1].id;
724 rndis_iad_descriptor.iFunction = us[2].id;
726 /* allocate instance-specific interface IDs */
727 status = usb_interface_id(c, f);
730 rndis->ctrl_id = status;
731 rndis_iad_descriptor.bFirstInterface = status;
733 rndis_control_intf.bInterfaceNumber = status;
734 rndis_union_desc.bMasterInterface0 = status;
736 if (cdev->use_os_string)
737 f->os_desc_table[0].if_id =
738 rndis_iad_descriptor.bFirstInterface;
740 status = usb_interface_id(c, f);
743 rndis->data_id = status;
745 rndis_data_intf.bInterfaceNumber = status;
746 rndis_union_desc.bSlaveInterface0 = status;
750 /* allocate instance-specific endpoints */
751 ep = usb_ep_autoconfig(cdev->gadget, &fs_in_desc);
754 rndis->port.in_ep = ep;
756 ep = usb_ep_autoconfig(cdev->gadget, &fs_out_desc);
759 rndis->port.out_ep = ep;
761 /* NOTE: a status/notification endpoint is, strictly speaking,
762 * optional. We don't treat it that way though! It's simpler,
763 * and some newer profiles don't treat it as optional.
765 ep = usb_ep_autoconfig(cdev->gadget, &fs_notify_desc);
772 /* allocate notification request and buffer */
773 rndis->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL);
774 if (!rndis->notify_req)
776 rndis->notify_req->buf = kmalloc(STATUS_BYTECOUNT, GFP_KERNEL);
777 if (!rndis->notify_req->buf)
779 rndis->notify_req->length = STATUS_BYTECOUNT;
780 rndis->notify_req->context = rndis;
781 rndis->notify_req->complete = rndis_response_complete;
783 /* support all relevant hardware speeds... we expect that when
784 * hardware is dual speed, all bulk-capable endpoints work at
787 hs_in_desc.bEndpointAddress = fs_in_desc.bEndpointAddress;
788 hs_out_desc.bEndpointAddress = fs_out_desc.bEndpointAddress;
789 hs_notify_desc.bEndpointAddress = fs_notify_desc.bEndpointAddress;
791 ss_in_desc.bEndpointAddress = fs_in_desc.bEndpointAddress;
792 ss_out_desc.bEndpointAddress = fs_out_desc.bEndpointAddress;
793 ss_notify_desc.bEndpointAddress = fs_notify_desc.bEndpointAddress;
795 status = usb_assign_descriptors(f, eth_fs_function, eth_hs_function,
796 eth_ss_function, eth_ss_function);
800 rndis->port.open = rndis_open;
801 rndis->port.close = rndis_close;
803 rndis_set_param_medium(rndis->params, RNDIS_MEDIUM_802_3, 0);
804 rndis_set_host_mac(rndis->params, rndis->ethaddr);
806 if (rndis->manufacturer && rndis->vendorID &&
807 rndis_set_param_vendor(rndis->params, rndis->vendorID,
808 rndis->manufacturer)) {
810 goto fail_free_descs;
813 /* NOTE: all that is done without knowing or caring about
814 * the network link ... which is unavailable to this code
815 * until we're activated via set_alt().
818 DBG(cdev, "RNDIS: %s speed IN/%s OUT/%s NOTIFY/%s\n",
819 gadget_is_superspeed(c->cdev->gadget) ? "super" :
820 gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
821 rndis->port.in_ep->name, rndis->port.out_ep->name,
822 rndis->notify->name);
826 usb_free_all_descriptors(f);
828 kfree(f->os_desc_table);
831 if (rndis->notify_req) {
832 kfree(rndis->notify_req->buf);
833 usb_ep_free_request(rndis->notify, rndis->notify_req);
836 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
841 void rndis_borrow_net(struct usb_function_instance *f, struct net_device *net)
843 struct f_rndis_opts *opts;
845 opts = container_of(f, struct f_rndis_opts, func_inst);
847 gether_cleanup(netdev_priv(opts->net));
849 free_netdev(opts->net);
850 opts->borrowed_net = opts->bound = true;
853 EXPORT_SYMBOL_GPL(rndis_borrow_net);
855 static inline struct f_rndis_opts *to_f_rndis_opts(struct config_item *item)
857 return container_of(to_config_group(item), struct f_rndis_opts,
861 /* f_rndis_item_ops */
862 USB_ETHERNET_CONFIGFS_ITEM(rndis);
864 /* f_rndis_opts_dev_addr */
865 USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(rndis);
867 /* f_rndis_opts_host_addr */
868 USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(rndis);
870 /* f_rndis_opts_qmult */
871 USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(rndis);
873 /* f_rndis_opts_ifname */
874 USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(rndis);
876 /* f_rndis_opts_class */
877 USB_ETHER_CONFIGFS_ITEM_ATTR_U8_RW(rndis, class);
879 /* f_rndis_opts_subclass */
880 USB_ETHER_CONFIGFS_ITEM_ATTR_U8_RW(rndis, subclass);
882 /* f_rndis_opts_protocol */
883 USB_ETHER_CONFIGFS_ITEM_ATTR_U8_RW(rndis, protocol);
885 static struct configfs_attribute *rndis_attrs[] = {
886 &rndis_opts_attr_dev_addr,
887 &rndis_opts_attr_host_addr,
888 &rndis_opts_attr_qmult,
889 &rndis_opts_attr_ifname,
890 &rndis_opts_attr_class,
891 &rndis_opts_attr_subclass,
892 &rndis_opts_attr_protocol,
896 static struct config_item_type rndis_func_type = {
897 .ct_item_ops = &rndis_item_ops,
898 .ct_attrs = rndis_attrs,
899 .ct_owner = THIS_MODULE,
902 static void rndis_free_inst(struct usb_function_instance *f)
904 struct f_rndis_opts *opts;
906 opts = container_of(f, struct f_rndis_opts, func_inst);
907 if (!opts->borrowed_net) {
909 gether_cleanup(netdev_priv(opts->net));
911 free_netdev(opts->net);
914 kfree(opts->rndis_interf_group); /* single VLA chunk */
918 static struct usb_function_instance *rndis_alloc_inst(void)
920 struct f_rndis_opts *opts;
921 struct usb_os_desc *descs[1];
923 struct config_group *rndis_interf_group;
925 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
927 return ERR_PTR(-ENOMEM);
928 opts->rndis_os_desc.ext_compat_id = opts->rndis_ext_compat_id;
930 mutex_init(&opts->lock);
931 opts->func_inst.free_func_inst = rndis_free_inst;
932 opts->net = gether_setup_default();
933 if (IS_ERR(opts->net)) {
934 struct net_device *net = opts->net;
936 return ERR_CAST(net);
938 INIT_LIST_HEAD(&opts->rndis_os_desc.ext_prop);
940 opts->class = rndis_iad_descriptor.bFunctionClass;
941 opts->subclass = rndis_iad_descriptor.bFunctionSubClass;
942 opts->protocol = rndis_iad_descriptor.bFunctionProtocol;
944 descs[0] = &opts->rndis_os_desc;
946 config_group_init_type_name(&opts->func_inst.group, "",
949 usb_os_desc_prepare_interf_dir(&opts->func_inst.group, 1, descs,
951 if (IS_ERR(rndis_interf_group)) {
952 rndis_free_inst(&opts->func_inst);
953 return ERR_CAST(rndis_interf_group);
955 opts->rndis_interf_group = rndis_interf_group;
957 return &opts->func_inst;
960 static void rndis_free(struct usb_function *f)
962 struct f_rndis *rndis;
963 struct f_rndis_opts *opts;
965 rndis = func_to_rndis(f);
966 rndis_deregister(rndis->params);
967 opts = container_of(f->fi, struct f_rndis_opts, func_inst);
969 mutex_lock(&opts->lock);
971 mutex_unlock(&opts->lock);
974 static void rndis_unbind(struct usb_configuration *c, struct usb_function *f)
976 struct f_rndis *rndis = func_to_rndis(f);
978 kfree(f->os_desc_table);
980 usb_free_all_descriptors(f);
982 kfree(rndis->notify_req->buf);
983 usb_ep_free_request(rndis->notify, rndis->notify_req);
986 static struct usb_function *rndis_alloc(struct usb_function_instance *fi)
988 struct f_rndis *rndis;
989 struct f_rndis_opts *opts;
990 struct rndis_params *params;
992 /* allocate and initialize one new instance */
993 rndis = kzalloc(sizeof(*rndis), GFP_KERNEL);
995 return ERR_PTR(-ENOMEM);
997 opts = container_of(fi, struct f_rndis_opts, func_inst);
998 mutex_lock(&opts->lock);
1001 gether_get_host_addr_u8(opts->net, rndis->ethaddr);
1002 rndis->vendorID = opts->vendor_id;
1003 rndis->manufacturer = opts->manufacturer;
1005 rndis->port.ioport = netdev_priv(opts->net);
1006 mutex_unlock(&opts->lock);
1007 /* RNDIS activates when the host changes this filter */
1008 rndis->port.cdc_filter = 0;
1010 /* RNDIS has special (and complex) framing */
1011 rndis->port.header_len = sizeof(struct rndis_packet_msg_type);
1012 rndis->port.wrap = rndis_add_header;
1013 rndis->port.unwrap = rndis_rm_hdr;
1015 rndis->port.func.name = "rndis";
1016 /* descriptors are per-instance copies */
1017 rndis->port.func.bind = rndis_bind;
1018 rndis->port.func.unbind = rndis_unbind;
1019 rndis->port.func.set_alt = rndis_set_alt;
1020 rndis->port.func.setup = rndis_setup;
1021 rndis->port.func.disable = rndis_disable;
1022 rndis->port.func.free_func = rndis_free;
1024 params = rndis_register(rndis_response_available, rndis);
1025 if (IS_ERR(params)) {
1027 return ERR_CAST(params);
1029 rndis->params = params;
1031 return &rndis->port.func;
1034 DECLARE_USB_FUNCTION_INIT(rndis, rndis_alloc_inst, rndis_alloc);
1035 MODULE_LICENSE("GPL");
1036 MODULE_AUTHOR("David Brownell");