1 /*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 */
21 #include <linux/kernel.h>
22 #include <linux/sched.h>
23 #include <linux/wait.h>
24 #include <linux/highmem.h>
25 #include <linux/slab.h>
26 #include <linux/io.h>
27 #include <linux/if_ether.h>
28 #include <linux/netdevice.h>
29 #include <linux/if_vlan.h>
30 #include <linux/nls.h>
31
32 #include "hyperv_net.h"
33
34
35 #define RNDIS_EXT_LEN 100
36 struct rndis_request {
37 struct list_head list_ent;
38 struct completion wait_event;
39
40 struct rndis_message response_msg;
41 /*
42 * The buffer for extended info after the RNDIS response message. It's
43 * referenced based on the data offset in the RNDIS message. Its size
44 * is enough for current needs, and should be sufficient for the near
45 * future.
46 */
47 u8 response_ext[RNDIS_EXT_LEN];
48
49 /* Simplify allocation by having a netvsc packet inline */
50 struct hv_netvsc_packet pkt;
51 /* Set 2 pages for rndis requests crossing page boundary */
52 struct hv_page_buffer buf[2];
53
54 struct rndis_message request_msg;
55 /*
56 * The buffer for the extended info after the RNDIS request message.
57 * It is referenced and sized in a similar way as response_ext.
58 */
59 u8 request_ext[RNDIS_EXT_LEN];
60 };
61
62 static void rndis_filter_send_completion(void *ctx);
63
64
get_rndis_device(void)65 static struct rndis_device *get_rndis_device(void)
66 {
67 struct rndis_device *device;
68
69 device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
70 if (!device)
71 return NULL;
72
73 spin_lock_init(&device->request_lock);
74
75 INIT_LIST_HEAD(&device->req_list);
76
77 device->state = RNDIS_DEV_UNINITIALIZED;
78
79 return device;
80 }
81
get_rndis_request(struct rndis_device * dev,u32 msg_type,u32 msg_len)82 static struct rndis_request *get_rndis_request(struct rndis_device *dev,
83 u32 msg_type,
84 u32 msg_len)
85 {
86 struct rndis_request *request;
87 struct rndis_message *rndis_msg;
88 struct rndis_set_request *set;
89 unsigned long flags;
90
91 request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
92 if (!request)
93 return NULL;
94
95 init_completion(&request->wait_event);
96
97 rndis_msg = &request->request_msg;
98 rndis_msg->ndis_msg_type = msg_type;
99 rndis_msg->msg_len = msg_len;
100
101 /*
102 * Set the request id. This field is always after the rndis header for
103 * request/response packet types so we just used the SetRequest as a
104 * template
105 */
106 set = &rndis_msg->msg.set_req;
107 set->req_id = atomic_inc_return(&dev->new_req_id);
108
109 /* Add to the request list */
110 spin_lock_irqsave(&dev->request_lock, flags);
111 list_add_tail(&request->list_ent, &dev->req_list);
112 spin_unlock_irqrestore(&dev->request_lock, flags);
113
114 return request;
115 }
116
put_rndis_request(struct rndis_device * dev,struct rndis_request * req)117 static void put_rndis_request(struct rndis_device *dev,
118 struct rndis_request *req)
119 {
120 unsigned long flags;
121
122 spin_lock_irqsave(&dev->request_lock, flags);
123 list_del(&req->list_ent);
124 spin_unlock_irqrestore(&dev->request_lock, flags);
125
126 kfree(req);
127 }
128
dump_rndis_message(struct hv_device * hv_dev,struct rndis_message * rndis_msg)129 static void dump_rndis_message(struct hv_device *hv_dev,
130 struct rndis_message *rndis_msg)
131 {
132 struct net_device *netdev;
133 struct netvsc_device *net_device;
134
135 net_device = hv_get_drvdata(hv_dev);
136 netdev = net_device->ndev;
137
138 switch (rndis_msg->ndis_msg_type) {
139 case RNDIS_MSG_PACKET:
140 netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "
141 "data offset %u data len %u, # oob %u, "
142 "oob offset %u, oob len %u, pkt offset %u, "
143 "pkt len %u\n",
144 rndis_msg->msg_len,
145 rndis_msg->msg.pkt.data_offset,
146 rndis_msg->msg.pkt.data_len,
147 rndis_msg->msg.pkt.num_oob_data_elements,
148 rndis_msg->msg.pkt.oob_data_offset,
149 rndis_msg->msg.pkt.oob_data_len,
150 rndis_msg->msg.pkt.per_pkt_info_offset,
151 rndis_msg->msg.pkt.per_pkt_info_len);
152 break;
153
154 case RNDIS_MSG_INIT_C:
155 netdev_dbg(netdev, "RNDIS_MSG_INIT_C "
156 "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
157 "device flags %d, max xfer size 0x%x, max pkts %u, "
158 "pkt aligned %u)\n",
159 rndis_msg->msg_len,
160 rndis_msg->msg.init_complete.req_id,
161 rndis_msg->msg.init_complete.status,
162 rndis_msg->msg.init_complete.major_ver,
163 rndis_msg->msg.init_complete.minor_ver,
164 rndis_msg->msg.init_complete.dev_flags,
165 rndis_msg->msg.init_complete.max_xfer_size,
166 rndis_msg->msg.init_complete.
167 max_pkt_per_msg,
168 rndis_msg->msg.init_complete.
169 pkt_alignment_factor);
170 break;
171
172 case RNDIS_MSG_QUERY_C:
173 netdev_dbg(netdev, "RNDIS_MSG_QUERY_C "
174 "(len %u, id 0x%x, status 0x%x, buf len %u, "
175 "buf offset %u)\n",
176 rndis_msg->msg_len,
177 rndis_msg->msg.query_complete.req_id,
178 rndis_msg->msg.query_complete.status,
179 rndis_msg->msg.query_complete.
180 info_buflen,
181 rndis_msg->msg.query_complete.
182 info_buf_offset);
183 break;
184
185 case RNDIS_MSG_SET_C:
186 netdev_dbg(netdev,
187 "RNDIS_MSG_SET_C (len %u, id 0x%x, status 0x%x)\n",
188 rndis_msg->msg_len,
189 rndis_msg->msg.set_complete.req_id,
190 rndis_msg->msg.set_complete.status);
191 break;
192
193 case RNDIS_MSG_INDICATE:
194 netdev_dbg(netdev, "RNDIS_MSG_INDICATE "
195 "(len %u, status 0x%x, buf len %u, buf offset %u)\n",
196 rndis_msg->msg_len,
197 rndis_msg->msg.indicate_status.status,
198 rndis_msg->msg.indicate_status.status_buflen,
199 rndis_msg->msg.indicate_status.status_buf_offset);
200 break;
201
202 default:
203 netdev_dbg(netdev, "0x%x (len %u)\n",
204 rndis_msg->ndis_msg_type,
205 rndis_msg->msg_len);
206 break;
207 }
208 }
209
rndis_filter_send_request(struct rndis_device * dev,struct rndis_request * req)210 static int rndis_filter_send_request(struct rndis_device *dev,
211 struct rndis_request *req)
212 {
213 int ret;
214 struct hv_netvsc_packet *packet;
215
216 /* Setup the packet to send it */
217 packet = &req->pkt;
218
219 packet->is_data_pkt = false;
220 packet->total_data_buflen = req->request_msg.msg_len;
221 packet->page_buf_cnt = 1;
222
223 packet->page_buf[0].pfn = virt_to_phys(&req->request_msg) >>
224 PAGE_SHIFT;
225 packet->page_buf[0].len = req->request_msg.msg_len;
226 packet->page_buf[0].offset =
227 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
228
229 /* Add one page_buf when request_msg crossing page boundary */
230 if (packet->page_buf[0].offset + packet->page_buf[0].len > PAGE_SIZE) {
231 packet->page_buf_cnt++;
232 packet->page_buf[0].len = PAGE_SIZE -
233 packet->page_buf[0].offset;
234 packet->page_buf[1].pfn = virt_to_phys((void *)&req->request_msg
235 + packet->page_buf[0].len) >> PAGE_SHIFT;
236 packet->page_buf[1].offset = 0;
237 packet->page_buf[1].len = req->request_msg.msg_len -
238 packet->page_buf[0].len;
239 }
240
241 packet->completion.send.send_completion = NULL;
242
243 ret = netvsc_send(dev->net_dev->dev, packet);
244 return ret;
245 }
246
rndis_filter_receive_response(struct rndis_device * dev,struct rndis_message * resp)247 static void rndis_filter_receive_response(struct rndis_device *dev,
248 struct rndis_message *resp)
249 {
250 struct rndis_request *request = NULL;
251 bool found = false;
252 unsigned long flags;
253 struct net_device *ndev;
254
255 ndev = dev->net_dev->ndev;
256
257 spin_lock_irqsave(&dev->request_lock, flags);
258 list_for_each_entry(request, &dev->req_list, list_ent) {
259 /*
260 * All request/response message contains RequestId as the 1st
261 * field
262 */
263 if (request->request_msg.msg.init_req.req_id
264 == resp->msg.init_complete.req_id) {
265 found = true;
266 break;
267 }
268 }
269 spin_unlock_irqrestore(&dev->request_lock, flags);
270
271 if (found) {
272 if (resp->msg_len <=
273 sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
274 memcpy(&request->response_msg, resp,
275 resp->msg_len);
276 } else {
277 netdev_err(ndev,
278 "rndis response buffer overflow "
279 "detected (size %u max %zu)\n",
280 resp->msg_len,
281 sizeof(struct rndis_filter_packet));
282
283 if (resp->ndis_msg_type ==
284 RNDIS_MSG_RESET_C) {
285 /* does not have a request id field */
286 request->response_msg.msg.reset_complete.
287 status = RNDIS_STATUS_BUFFER_OVERFLOW;
288 } else {
289 request->response_msg.msg.
290 init_complete.status =
291 RNDIS_STATUS_BUFFER_OVERFLOW;
292 }
293 }
294
295 complete(&request->wait_event);
296 } else {
297 netdev_err(ndev,
298 "no rndis request found for this response "
299 "(id 0x%x res type 0x%x)\n",
300 resp->msg.init_complete.req_id,
301 resp->ndis_msg_type);
302 }
303 }
304
rndis_filter_receive_indicate_status(struct rndis_device * dev,struct rndis_message * resp)305 static void rndis_filter_receive_indicate_status(struct rndis_device *dev,
306 struct rndis_message *resp)
307 {
308 struct rndis_indicate_status *indicate =
309 &resp->msg.indicate_status;
310
311 if (indicate->status == RNDIS_STATUS_MEDIA_CONNECT) {
312 netvsc_linkstatus_callback(
313 dev->net_dev->dev, 1);
314 } else if (indicate->status == RNDIS_STATUS_MEDIA_DISCONNECT) {
315 netvsc_linkstatus_callback(
316 dev->net_dev->dev, 0);
317 } else {
318 /*
319 * TODO:
320 */
321 }
322 }
323
324 /*
325 * Get the Per-Packet-Info with the specified type
326 * return NULL if not found.
327 */
rndis_get_ppi(struct rndis_packet * rpkt,u32 type)328 static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
329 {
330 struct rndis_per_packet_info *ppi;
331 int len;
332
333 if (rpkt->per_pkt_info_offset == 0)
334 return NULL;
335
336 ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
337 rpkt->per_pkt_info_offset);
338 len = rpkt->per_pkt_info_len;
339
340 while (len > 0) {
341 if (ppi->type == type)
342 return (void *)((ulong)ppi + ppi->ppi_offset);
343 len -= ppi->size;
344 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
345 }
346
347 return NULL;
348 }
349
rndis_filter_receive_data(struct rndis_device * dev,struct rndis_message * msg,struct hv_netvsc_packet * pkt)350 static void rndis_filter_receive_data(struct rndis_device *dev,
351 struct rndis_message *msg,
352 struct hv_netvsc_packet *pkt)
353 {
354 struct rndis_packet *rndis_pkt;
355 u32 data_offset;
356 struct ndis_pkt_8021q_info *vlan;
357
358 rndis_pkt = &msg->msg.pkt;
359
360 /* Remove the rndis header and pass it back up the stack */
361 data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
362
363 pkt->total_data_buflen -= data_offset;
364
365 /*
366 * Make sure we got a valid RNDIS message, now total_data_buflen
367 * should be the data packet size plus the trailer padding size
368 */
369 if (pkt->total_data_buflen < rndis_pkt->data_len) {
370 netdev_err(dev->net_dev->ndev, "rndis message buffer "
371 "overflow detected (got %u, min %u)"
372 "...dropping this message!\n",
373 pkt->total_data_buflen, rndis_pkt->data_len);
374 return;
375 }
376
377 /*
378 * Remove the rndis trailer padding from rndis packet message
379 * rndis_pkt->data_len tell us the real data length, we only copy
380 * the data packet to the stack, without the rndis trailer padding
381 */
382 pkt->total_data_buflen = rndis_pkt->data_len;
383 pkt->data = (void *)((unsigned long)pkt->data + data_offset);
384
385 pkt->is_data_pkt = true;
386
387 vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
388 if (vlan) {
389 pkt->vlan_tci = VLAN_TAG_PRESENT | vlan->vlanid |
390 (vlan->pri << VLAN_PRIO_SHIFT);
391 } else {
392 pkt->vlan_tci = 0;
393 }
394
395 netvsc_recv_callback(dev->net_dev->dev, pkt);
396 }
397
rndis_filter_receive(struct hv_device * dev,struct hv_netvsc_packet * pkt)398 int rndis_filter_receive(struct hv_device *dev,
399 struct hv_netvsc_packet *pkt)
400 {
401 struct netvsc_device *net_dev = hv_get_drvdata(dev);
402 struct rndis_device *rndis_dev;
403 struct rndis_message *rndis_msg;
404 struct net_device *ndev;
405 int ret = 0;
406
407 if (!net_dev) {
408 ret = -EINVAL;
409 goto exit;
410 }
411
412 ndev = net_dev->ndev;
413
414 /* Make sure the rndis device state is initialized */
415 if (!net_dev->extension) {
416 netdev_err(ndev, "got rndis message but no rndis device - "
417 "dropping this message!\n");
418 ret = -ENODEV;
419 goto exit;
420 }
421
422 rndis_dev = (struct rndis_device *)net_dev->extension;
423 if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
424 netdev_err(ndev, "got rndis message but rndis device "
425 "uninitialized...dropping this message!\n");
426 ret = -ENODEV;
427 goto exit;
428 }
429
430 rndis_msg = pkt->data;
431
432 dump_rndis_message(dev, rndis_msg);
433
434 switch (rndis_msg->ndis_msg_type) {
435 case RNDIS_MSG_PACKET:
436 /* data msg */
437 rndis_filter_receive_data(rndis_dev, rndis_msg, pkt);
438 break;
439
440 case RNDIS_MSG_INIT_C:
441 case RNDIS_MSG_QUERY_C:
442 case RNDIS_MSG_SET_C:
443 /* completion msgs */
444 rndis_filter_receive_response(rndis_dev, rndis_msg);
445 break;
446
447 case RNDIS_MSG_INDICATE:
448 /* notification msgs */
449 rndis_filter_receive_indicate_status(rndis_dev, rndis_msg);
450 break;
451 default:
452 netdev_err(ndev,
453 "unhandled rndis message (type %u len %u)\n",
454 rndis_msg->ndis_msg_type,
455 rndis_msg->msg_len);
456 break;
457 }
458
459 exit:
460 if (ret != 0)
461 pkt->status = NVSP_STAT_FAIL;
462
463 return ret;
464 }
465
rndis_filter_query_device(struct rndis_device * dev,u32 oid,void * result,u32 * result_size)466 static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
467 void *result, u32 *result_size)
468 {
469 struct rndis_request *request;
470 u32 inresult_size = *result_size;
471 struct rndis_query_request *query;
472 struct rndis_query_complete *query_complete;
473 int ret = 0;
474 int t;
475
476 if (!result)
477 return -EINVAL;
478
479 *result_size = 0;
480 request = get_rndis_request(dev, RNDIS_MSG_QUERY,
481 RNDIS_MESSAGE_SIZE(struct rndis_query_request));
482 if (!request) {
483 ret = -ENOMEM;
484 goto cleanup;
485 }
486
487 /* Setup the rndis query */
488 query = &request->request_msg.msg.query_req;
489 query->oid = oid;
490 query->info_buf_offset = sizeof(struct rndis_query_request);
491 query->info_buflen = 0;
492 query->dev_vc_handle = 0;
493
494 ret = rndis_filter_send_request(dev, request);
495 if (ret != 0)
496 goto cleanup;
497
498 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
499 if (t == 0) {
500 ret = -ETIMEDOUT;
501 goto cleanup;
502 }
503
504 /* Copy the response back */
505 query_complete = &request->response_msg.msg.query_complete;
506
507 if (query_complete->info_buflen > inresult_size) {
508 ret = -1;
509 goto cleanup;
510 }
511
512 memcpy(result,
513 (void *)((unsigned long)query_complete +
514 query_complete->info_buf_offset),
515 query_complete->info_buflen);
516
517 *result_size = query_complete->info_buflen;
518
519 cleanup:
520 if (request)
521 put_rndis_request(dev, request);
522
523 return ret;
524 }
525
rndis_filter_query_device_mac(struct rndis_device * dev)526 static int rndis_filter_query_device_mac(struct rndis_device *dev)
527 {
528 u32 size = ETH_ALEN;
529
530 return rndis_filter_query_device(dev,
531 RNDIS_OID_802_3_PERMANENT_ADDRESS,
532 dev->hw_mac_adr, &size);
533 }
534
535 #define NWADR_STR "NetworkAddress"
536 #define NWADR_STRLEN 14
537
rndis_filter_set_device_mac(struct hv_device * hdev,char * mac)538 int rndis_filter_set_device_mac(struct hv_device *hdev, char *mac)
539 {
540 struct netvsc_device *nvdev = hv_get_drvdata(hdev);
541 struct rndis_device *rdev = nvdev->extension;
542 struct net_device *ndev = nvdev->ndev;
543 struct rndis_request *request;
544 struct rndis_set_request *set;
545 struct rndis_config_parameter_info *cpi;
546 wchar_t *cfg_nwadr, *cfg_mac;
547 struct rndis_set_complete *set_complete;
548 char macstr[2*ETH_ALEN+1];
549 u32 extlen = sizeof(struct rndis_config_parameter_info) +
550 2*NWADR_STRLEN + 4*ETH_ALEN;
551 int ret, t;
552
553 request = get_rndis_request(rdev, RNDIS_MSG_SET,
554 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
555 if (!request)
556 return -ENOMEM;
557
558 set = &request->request_msg.msg.set_req;
559 set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
560 set->info_buflen = extlen;
561 set->info_buf_offset = sizeof(struct rndis_set_request);
562 set->dev_vc_handle = 0;
563
564 cpi = (struct rndis_config_parameter_info *)((ulong)set +
565 set->info_buf_offset);
566 cpi->parameter_name_offset =
567 sizeof(struct rndis_config_parameter_info);
568 /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
569 cpi->parameter_name_length = 2*NWADR_STRLEN;
570 cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
571 cpi->parameter_value_offset =
572 cpi->parameter_name_offset + cpi->parameter_name_length;
573 /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
574 cpi->parameter_value_length = 4*ETH_ALEN;
575
576 cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
577 cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
578 ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
579 cfg_nwadr, NWADR_STRLEN);
580 if (ret < 0)
581 goto cleanup;
582 snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
583 ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
584 cfg_mac, 2*ETH_ALEN);
585 if (ret < 0)
586 goto cleanup;
587
588 ret = rndis_filter_send_request(rdev, request);
589 if (ret != 0)
590 goto cleanup;
591
592 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
593 if (t == 0) {
594 netdev_err(ndev, "timeout before we got a set response...\n");
595 /*
596 * can't put_rndis_request, since we may still receive a
597 * send-completion.
598 */
599 return -EBUSY;
600 } else {
601 set_complete = &request->response_msg.msg.set_complete;
602 if (set_complete->status != RNDIS_STATUS_SUCCESS) {
603 netdev_err(ndev, "Fail to set MAC on host side:0x%x\n",
604 set_complete->status);
605 ret = -EINVAL;
606 }
607 }
608
609 cleanup:
610 put_rndis_request(rdev, request);
611 return ret;
612 }
613
614
rndis_filter_query_device_link_status(struct rndis_device * dev)615 static int rndis_filter_query_device_link_status(struct rndis_device *dev)
616 {
617 u32 size = sizeof(u32);
618 u32 link_status;
619 int ret;
620
621 ret = rndis_filter_query_device(dev,
622 RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
623 &link_status, &size);
624 dev->link_state = (link_status != 0) ? true : false;
625
626 return ret;
627 }
628
rndis_filter_set_packet_filter(struct rndis_device * dev,u32 new_filter)629 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter)
630 {
631 struct rndis_request *request;
632 struct rndis_set_request *set;
633 struct rndis_set_complete *set_complete;
634 u32 status;
635 int ret, t;
636 struct net_device *ndev;
637
638 ndev = dev->net_dev->ndev;
639
640 request = get_rndis_request(dev, RNDIS_MSG_SET,
641 RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
642 sizeof(u32));
643 if (!request) {
644 ret = -ENOMEM;
645 goto cleanup;
646 }
647
648 /* Setup the rndis set */
649 set = &request->request_msg.msg.set_req;
650 set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
651 set->info_buflen = sizeof(u32);
652 set->info_buf_offset = sizeof(struct rndis_set_request);
653
654 memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
655 &new_filter, sizeof(u32));
656
657 ret = rndis_filter_send_request(dev, request);
658 if (ret != 0)
659 goto cleanup;
660
661 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
662
663 if (t == 0) {
664 netdev_err(ndev,
665 "timeout before we got a set response...\n");
666 ret = -ETIMEDOUT;
667 /*
668 * We can't deallocate the request since we may still receive a
669 * send completion for it.
670 */
671 goto exit;
672 } else {
673 set_complete = &request->response_msg.msg.set_complete;
674 status = set_complete->status;
675 }
676
677 cleanup:
678 if (request)
679 put_rndis_request(dev, request);
680 exit:
681 return ret;
682 }
683
684
rndis_filter_init_device(struct rndis_device * dev)685 static int rndis_filter_init_device(struct rndis_device *dev)
686 {
687 struct rndis_request *request;
688 struct rndis_initialize_request *init;
689 struct rndis_initialize_complete *init_complete;
690 u32 status;
691 int ret, t;
692
693 request = get_rndis_request(dev, RNDIS_MSG_INIT,
694 RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
695 if (!request) {
696 ret = -ENOMEM;
697 goto cleanup;
698 }
699
700 /* Setup the rndis set */
701 init = &request->request_msg.msg.init_req;
702 init->major_ver = RNDIS_MAJOR_VERSION;
703 init->minor_ver = RNDIS_MINOR_VERSION;
704 init->max_xfer_size = 0x4000;
705
706 dev->state = RNDIS_DEV_INITIALIZING;
707
708 ret = rndis_filter_send_request(dev, request);
709 if (ret != 0) {
710 dev->state = RNDIS_DEV_UNINITIALIZED;
711 goto cleanup;
712 }
713
714
715 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
716
717 if (t == 0) {
718 ret = -ETIMEDOUT;
719 goto cleanup;
720 }
721
722 init_complete = &request->response_msg.msg.init_complete;
723 status = init_complete->status;
724 if (status == RNDIS_STATUS_SUCCESS) {
725 dev->state = RNDIS_DEV_INITIALIZED;
726 ret = 0;
727 } else {
728 dev->state = RNDIS_DEV_UNINITIALIZED;
729 ret = -EINVAL;
730 }
731
732 cleanup:
733 if (request)
734 put_rndis_request(dev, request);
735
736 return ret;
737 }
738
rndis_filter_halt_device(struct rndis_device * dev)739 static void rndis_filter_halt_device(struct rndis_device *dev)
740 {
741 struct rndis_request *request;
742 struct rndis_halt_request *halt;
743 struct netvsc_device *nvdev = dev->net_dev;
744 struct hv_device *hdev = nvdev->dev;
745 ulong flags;
746
747 /* Attempt to do a rndis device halt */
748 request = get_rndis_request(dev, RNDIS_MSG_HALT,
749 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
750 if (!request)
751 goto cleanup;
752
753 /* Setup the rndis set */
754 halt = &request->request_msg.msg.halt_req;
755 halt->req_id = atomic_inc_return(&dev->new_req_id);
756
757 /* Ignore return since this msg is optional. */
758 rndis_filter_send_request(dev, request);
759
760 dev->state = RNDIS_DEV_UNINITIALIZED;
761
762 cleanup:
763 spin_lock_irqsave(&hdev->channel->inbound_lock, flags);
764 nvdev->destroy = true;
765 spin_unlock_irqrestore(&hdev->channel->inbound_lock, flags);
766
767 /* Wait for all send completions */
768 wait_event(nvdev->wait_drain,
769 atomic_read(&nvdev->num_outstanding_sends) == 0);
770
771 if (request)
772 put_rndis_request(dev, request);
773 return;
774 }
775
rndis_filter_open_device(struct rndis_device * dev)776 static int rndis_filter_open_device(struct rndis_device *dev)
777 {
778 int ret;
779
780 if (dev->state != RNDIS_DEV_INITIALIZED)
781 return 0;
782
783 ret = rndis_filter_set_packet_filter(dev,
784 NDIS_PACKET_TYPE_BROADCAST |
785 NDIS_PACKET_TYPE_ALL_MULTICAST |
786 NDIS_PACKET_TYPE_DIRECTED);
787 if (ret == 0)
788 dev->state = RNDIS_DEV_DATAINITIALIZED;
789
790 return ret;
791 }
792
rndis_filter_close_device(struct rndis_device * dev)793 static int rndis_filter_close_device(struct rndis_device *dev)
794 {
795 int ret;
796
797 if (dev->state != RNDIS_DEV_DATAINITIALIZED)
798 return 0;
799
800 ret = rndis_filter_set_packet_filter(dev, 0);
801 if (ret == 0)
802 dev->state = RNDIS_DEV_INITIALIZED;
803
804 return ret;
805 }
806
rndis_filter_device_add(struct hv_device * dev,void * additional_info)807 int rndis_filter_device_add(struct hv_device *dev,
808 void *additional_info)
809 {
810 int ret;
811 struct netvsc_device *net_device;
812 struct rndis_device *rndis_device;
813 struct netvsc_device_info *device_info = additional_info;
814
815 rndis_device = get_rndis_device();
816 if (!rndis_device)
817 return -ENODEV;
818
819 /*
820 * Let the inner driver handle this first to create the netvsc channel
821 * NOTE! Once the channel is created, we may get a receive callback
822 * (RndisFilterOnReceive()) before this call is completed
823 */
824 ret = netvsc_device_add(dev, additional_info);
825 if (ret != 0) {
826 kfree(rndis_device);
827 return ret;
828 }
829
830
831 /* Initialize the rndis device */
832 net_device = hv_get_drvdata(dev);
833
834 net_device->extension = rndis_device;
835 rndis_device->net_dev = net_device;
836
837 /* Send the rndis initialization message */
838 ret = rndis_filter_init_device(rndis_device);
839 if (ret != 0) {
840 rndis_filter_device_remove(dev);
841 return ret;
842 }
843
844 /* Get the mac address */
845 ret = rndis_filter_query_device_mac(rndis_device);
846 if (ret != 0) {
847 rndis_filter_device_remove(dev);
848 return ret;
849 }
850
851 memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
852
853 rndis_filter_query_device_link_status(rndis_device);
854
855 device_info->link_state = rndis_device->link_state;
856
857 dev_info(&dev->device, "Device MAC %pM link state %s\n",
858 rndis_device->hw_mac_adr,
859 device_info->link_state ? "down" : "up");
860
861 return ret;
862 }
863
rndis_filter_device_remove(struct hv_device * dev)864 void rndis_filter_device_remove(struct hv_device *dev)
865 {
866 struct netvsc_device *net_dev = hv_get_drvdata(dev);
867 struct rndis_device *rndis_dev = net_dev->extension;
868
869 /* Halt and release the rndis device */
870 rndis_filter_halt_device(rndis_dev);
871
872 kfree(rndis_dev);
873 net_dev->extension = NULL;
874
875 netvsc_device_remove(dev);
876 }
877
878
rndis_filter_open(struct hv_device * dev)879 int rndis_filter_open(struct hv_device *dev)
880 {
881 struct netvsc_device *net_device = hv_get_drvdata(dev);
882
883 if (!net_device)
884 return -EINVAL;
885
886 return rndis_filter_open_device(net_device->extension);
887 }
888
rndis_filter_close(struct hv_device * dev)889 int rndis_filter_close(struct hv_device *dev)
890 {
891 struct netvsc_device *nvdev = hv_get_drvdata(dev);
892
893 if (!nvdev)
894 return -EINVAL;
895
896 return rndis_filter_close_device(nvdev->extension);
897 }
898
rndis_filter_send(struct hv_device * dev,struct hv_netvsc_packet * pkt)899 int rndis_filter_send(struct hv_device *dev,
900 struct hv_netvsc_packet *pkt)
901 {
902 int ret;
903 struct rndis_filter_packet *filter_pkt;
904 struct rndis_message *rndis_msg;
905 struct rndis_packet *rndis_pkt;
906 u32 rndis_msg_size;
907 bool isvlan = pkt->vlan_tci & VLAN_TAG_PRESENT;
908
909 /* Add the rndis header */
910 filter_pkt = (struct rndis_filter_packet *)pkt->extension;
911
912 rndis_msg = &filter_pkt->msg;
913 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
914 if (isvlan)
915 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
916
917 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
918 rndis_msg->msg_len = pkt->total_data_buflen +
919 rndis_msg_size;
920
921 rndis_pkt = &rndis_msg->msg.pkt;
922 rndis_pkt->data_offset = sizeof(struct rndis_packet);
923 if (isvlan)
924 rndis_pkt->data_offset += NDIS_VLAN_PPI_SIZE;
925 rndis_pkt->data_len = pkt->total_data_buflen;
926
927 if (isvlan) {
928 struct rndis_per_packet_info *ppi;
929 struct ndis_pkt_8021q_info *vlan;
930
931 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
932 rndis_pkt->per_pkt_info_len = NDIS_VLAN_PPI_SIZE;
933
934 ppi = (struct rndis_per_packet_info *)((ulong)rndis_pkt +
935 rndis_pkt->per_pkt_info_offset);
936 ppi->size = NDIS_VLAN_PPI_SIZE;
937 ppi->type = IEEE_8021Q_INFO;
938 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
939
940 vlan = (struct ndis_pkt_8021q_info *)((ulong)ppi +
941 ppi->ppi_offset);
942 vlan->vlanid = pkt->vlan_tci & VLAN_VID_MASK;
943 vlan->pri = (pkt->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
944 }
945
946 pkt->is_data_pkt = true;
947 pkt->page_buf[0].pfn = virt_to_phys(rndis_msg) >> PAGE_SHIFT;
948 pkt->page_buf[0].offset =
949 (unsigned long)rndis_msg & (PAGE_SIZE-1);
950 pkt->page_buf[0].len = rndis_msg_size;
951
952 /* Add one page_buf if the rndis msg goes beyond page boundary */
953 if (pkt->page_buf[0].offset + rndis_msg_size > PAGE_SIZE) {
954 int i;
955 for (i = pkt->page_buf_cnt; i > 1; i--)
956 pkt->page_buf[i] = pkt->page_buf[i-1];
957 pkt->page_buf_cnt++;
958 pkt->page_buf[0].len = PAGE_SIZE - pkt->page_buf[0].offset;
959 pkt->page_buf[1].pfn = virt_to_phys((void *)((ulong)
960 rndis_msg + pkt->page_buf[0].len)) >> PAGE_SHIFT;
961 pkt->page_buf[1].offset = 0;
962 pkt->page_buf[1].len = rndis_msg_size - pkt->page_buf[0].len;
963 }
964
965 /* Save the packet send completion and context */
966 filter_pkt->completion = pkt->completion.send.send_completion;
967 filter_pkt->completion_ctx =
968 pkt->completion.send.send_completion_ctx;
969
970 /* Use ours */
971 pkt->completion.send.send_completion = rndis_filter_send_completion;
972 pkt->completion.send.send_completion_ctx = filter_pkt;
973
974 ret = netvsc_send(dev, pkt);
975 if (ret != 0) {
976 /*
977 * Reset the completion to originals to allow retries from
978 * above
979 */
980 pkt->completion.send.send_completion =
981 filter_pkt->completion;
982 pkt->completion.send.send_completion_ctx =
983 filter_pkt->completion_ctx;
984 }
985
986 return ret;
987 }
988
rndis_filter_send_completion(void * ctx)989 static void rndis_filter_send_completion(void *ctx)
990 {
991 struct rndis_filter_packet *filter_pkt = ctx;
992
993 /* Pass it back to the original handler */
994 filter_pkt->completion(filter_pkt->completion_ctx);
995 }
996