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28#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
29
30#include <linux/types.h>
31#include <linux/interrupt.h>
32#include <linux/bitops.h>
33#include <linux/skbuff.h>
34
35#include "../nfc.h"
36#include <net/nfc/nci.h>
37#include <net/nfc/nci_core.h>
38#include <linux/nfc.h>
39
40
41
42static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
43 struct sk_buff *skb)
44{
45 struct nci_core_conn_credit_ntf *ntf = (void *) skb->data;
46 int i;
47
48 pr_debug("num_entries %d\n", ntf->num_entries);
49
50 if (ntf->num_entries > NCI_MAX_NUM_CONN)
51 ntf->num_entries = NCI_MAX_NUM_CONN;
52
53
54 for (i = 0; i < ntf->num_entries; i++) {
55 ntf->conn_entries[i].conn_id =
56 nci_conn_id(&ntf->conn_entries[i].conn_id);
57
58 pr_debug("entry[%d]: conn_id %d, credits %d\n",
59 i, ntf->conn_entries[i].conn_id,
60 ntf->conn_entries[i].credits);
61
62 if (ntf->conn_entries[i].conn_id == NCI_STATIC_RF_CONN_ID) {
63
64 atomic_add(ntf->conn_entries[i].credits,
65 &ndev->credits_cnt);
66 }
67 }
68
69
70 if (!skb_queue_empty(&ndev->tx_q))
71 queue_work(ndev->tx_wq, &ndev->tx_work);
72}
73
74static void nci_core_generic_error_ntf_packet(struct nci_dev *ndev,
75 struct sk_buff *skb)
76{
77 __u8 status = skb->data[0];
78
79 pr_debug("status 0x%x\n", status);
80
81 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
82
83
84 nci_req_complete(ndev, status);
85 }
86}
87
88static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev,
89 struct sk_buff *skb)
90{
91 struct nci_core_intf_error_ntf *ntf = (void *) skb->data;
92
93 ntf->conn_id = nci_conn_id(&ntf->conn_id);
94
95 pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id);
96
97
98 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
99 nci_data_exchange_complete(ndev, NULL, -EIO);
100}
101
102static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
103 struct rf_tech_specific_params_nfca_poll *nfca_poll,
104 __u8 *data)
105{
106 nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data));
107 data += 2;
108
109 nfca_poll->nfcid1_len = min_t(__u8, *data++, NFC_NFCID1_MAXSIZE);
110
111 pr_debug("sens_res 0x%x, nfcid1_len %d\n",
112 nfca_poll->sens_res, nfca_poll->nfcid1_len);
113
114 memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len);
115 data += nfca_poll->nfcid1_len;
116
117 nfca_poll->sel_res_len = *data++;
118
119 if (nfca_poll->sel_res_len != 0)
120 nfca_poll->sel_res = *data++;
121
122 pr_debug("sel_res_len %d, sel_res 0x%x\n",
123 nfca_poll->sel_res_len,
124 nfca_poll->sel_res);
125
126 return data;
127}
128
129static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
130 struct rf_tech_specific_params_nfcb_poll *nfcb_poll,
131 __u8 *data)
132{
133 nfcb_poll->sensb_res_len = min_t(__u8, *data++, NFC_SENSB_RES_MAXSIZE);
134
135 pr_debug("sensb_res_len %d\n", nfcb_poll->sensb_res_len);
136
137 memcpy(nfcb_poll->sensb_res, data, nfcb_poll->sensb_res_len);
138 data += nfcb_poll->sensb_res_len;
139
140 return data;
141}
142
143static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
144 struct rf_tech_specific_params_nfcf_poll *nfcf_poll,
145 __u8 *data)
146{
147 nfcf_poll->bit_rate = *data++;
148 nfcf_poll->sensf_res_len = min_t(__u8, *data++, NFC_SENSF_RES_MAXSIZE);
149
150 pr_debug("bit_rate %d, sensf_res_len %d\n",
151 nfcf_poll->bit_rate, nfcf_poll->sensf_res_len);
152
153 memcpy(nfcf_poll->sensf_res, data, nfcf_poll->sensf_res_len);
154 data += nfcf_poll->sensf_res_len;
155
156 return data;
157}
158
159static int nci_add_new_protocol(struct nci_dev *ndev,
160 struct nfc_target *target,
161 __u8 rf_protocol,
162 __u8 rf_tech_and_mode,
163 void *params)
164{
165 struct rf_tech_specific_params_nfca_poll *nfca_poll;
166 struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
167 struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
168 __u32 protocol;
169
170 if (rf_protocol == NCI_RF_PROTOCOL_T2T)
171 protocol = NFC_PROTO_MIFARE_MASK;
172 else if (rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
173 if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE)
174 protocol = NFC_PROTO_ISO14443_MASK;
175 else
176 protocol = NFC_PROTO_ISO14443_B_MASK;
177 else if (rf_protocol == NCI_RF_PROTOCOL_T3T)
178 protocol = NFC_PROTO_FELICA_MASK;
179 else if (rf_protocol == NCI_RF_PROTOCOL_NFC_DEP)
180 protocol = NFC_PROTO_NFC_DEP_MASK;
181 else
182 protocol = 0;
183
184 if (!(protocol & ndev->poll_prots)) {
185 pr_err("the target found does not have the desired protocol\n");
186 return -EPROTO;
187 }
188
189 if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
190 nfca_poll = (struct rf_tech_specific_params_nfca_poll *)params;
191
192 target->sens_res = nfca_poll->sens_res;
193 target->sel_res = nfca_poll->sel_res;
194 target->nfcid1_len = nfca_poll->nfcid1_len;
195 if (target->nfcid1_len > 0) {
196 memcpy(target->nfcid1, nfca_poll->nfcid1,
197 target->nfcid1_len);
198 }
199 } else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) {
200 nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params;
201
202 target->sensb_res_len = nfcb_poll->sensb_res_len;
203 if (target->sensb_res_len > 0) {
204 memcpy(target->sensb_res, nfcb_poll->sensb_res,
205 target->sensb_res_len);
206 }
207 } else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) {
208 nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params;
209
210 target->sensf_res_len = nfcf_poll->sensf_res_len;
211 if (target->sensf_res_len > 0) {
212 memcpy(target->sensf_res, nfcf_poll->sensf_res,
213 target->sensf_res_len);
214 }
215 } else {
216 pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode);
217 return -EPROTO;
218 }
219
220 target->supported_protocols |= protocol;
221
222 pr_debug("protocol 0x%x\n", protocol);
223
224 return 0;
225}
226
227static void nci_add_new_target(struct nci_dev *ndev,
228 struct nci_rf_discover_ntf *ntf)
229{
230 struct nfc_target *target;
231 int i, rc;
232
233 for (i = 0; i < ndev->n_targets; i++) {
234 target = &ndev->targets[i];
235 if (target->logical_idx == ntf->rf_discovery_id) {
236
237 nci_add_new_protocol(ndev, target, ntf->rf_protocol,
238 ntf->rf_tech_and_mode,
239 &ntf->rf_tech_specific_params);
240 return;
241 }
242 }
243
244
245 if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) {
246 pr_debug("not enough room, ignoring new target...\n");
247 return;
248 }
249
250 target = &ndev->targets[ndev->n_targets];
251
252 rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
253 ntf->rf_tech_and_mode,
254 &ntf->rf_tech_specific_params);
255 if (!rc) {
256 target->logical_idx = ntf->rf_discovery_id;
257 ndev->n_targets++;
258
259 pr_debug("logical idx %d, n_targets %d\n", target->logical_idx,
260 ndev->n_targets);
261 }
262}
263
264void nci_clear_target_list(struct nci_dev *ndev)
265{
266 memset(ndev->targets, 0,
267 (sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS));
268
269 ndev->n_targets = 0;
270}
271
272static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
273 struct sk_buff *skb)
274{
275 struct nci_rf_discover_ntf ntf;
276 __u8 *data = skb->data;
277 bool add_target = true;
278
279 ntf.rf_discovery_id = *data++;
280 ntf.rf_protocol = *data++;
281 ntf.rf_tech_and_mode = *data++;
282 ntf.rf_tech_specific_params_len = *data++;
283
284 pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
285 pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
286 pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode);
287 pr_debug("rf_tech_specific_params_len %d\n",
288 ntf.rf_tech_specific_params_len);
289
290 if (ntf.rf_tech_specific_params_len > 0) {
291 switch (ntf.rf_tech_and_mode) {
292 case NCI_NFC_A_PASSIVE_POLL_MODE:
293 data = nci_extract_rf_params_nfca_passive_poll(ndev,
294 &(ntf.rf_tech_specific_params.nfca_poll), data);
295 break;
296
297 case NCI_NFC_B_PASSIVE_POLL_MODE:
298 data = nci_extract_rf_params_nfcb_passive_poll(ndev,
299 &(ntf.rf_tech_specific_params.nfcb_poll), data);
300 break;
301
302 case NCI_NFC_F_PASSIVE_POLL_MODE:
303 data = nci_extract_rf_params_nfcf_passive_poll(ndev,
304 &(ntf.rf_tech_specific_params.nfcf_poll), data);
305 break;
306
307 default:
308 pr_err("unsupported rf_tech_and_mode 0x%x\n",
309 ntf.rf_tech_and_mode);
310 data += ntf.rf_tech_specific_params_len;
311 add_target = false;
312 }
313 }
314
315 ntf.ntf_type = *data++;
316 pr_debug("ntf_type %d\n", ntf.ntf_type);
317
318 if (add_target == true)
319 nci_add_new_target(ndev, &ntf);
320
321 if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) {
322 atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES);
323 } else {
324 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
325 nfc_targets_found(ndev->nfc_dev, ndev->targets,
326 ndev->n_targets);
327 }
328}
329
330static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
331 struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
332{
333 struct activation_params_nfca_poll_iso_dep *nfca_poll;
334 struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
335
336 switch (ntf->activation_rf_tech_and_mode) {
337 case NCI_NFC_A_PASSIVE_POLL_MODE:
338 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep;
339 nfca_poll->rats_res_len = min_t(__u8, *data++, 20);
340 pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len);
341 if (nfca_poll->rats_res_len > 0) {
342 memcpy(nfca_poll->rats_res,
343 data, nfca_poll->rats_res_len);
344 }
345 break;
346
347 case NCI_NFC_B_PASSIVE_POLL_MODE:
348 nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep;
349 nfcb_poll->attrib_res_len = min_t(__u8, *data++, 50);
350 pr_debug("attrib_res_len %d\n", nfcb_poll->attrib_res_len);
351 if (nfcb_poll->attrib_res_len > 0) {
352 memcpy(nfcb_poll->attrib_res,
353 data, nfcb_poll->attrib_res_len);
354 }
355 break;
356
357 default:
358 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
359 ntf->activation_rf_tech_and_mode);
360 return NCI_STATUS_RF_PROTOCOL_ERROR;
361 }
362
363 return NCI_STATUS_OK;
364}
365
366static int nci_extract_activation_params_nfc_dep(struct nci_dev *ndev,
367 struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
368{
369 struct activation_params_poll_nfc_dep *poll;
370 int i;
371
372 switch (ntf->activation_rf_tech_and_mode) {
373 case NCI_NFC_A_PASSIVE_POLL_MODE:
374 case NCI_NFC_F_PASSIVE_POLL_MODE:
375 poll = &ntf->activation_params.poll_nfc_dep;
376 poll->atr_res_len = min_t(__u8, *data++, 63);
377 pr_debug("atr_res_len %d\n", poll->atr_res_len);
378 if (poll->atr_res_len > 0) {
379 for (i = 0; i < poll->atr_res_len; i++)
380 poll->atr_res[poll->atr_res_len-1-i] = data[i];
381 }
382 break;
383
384 default:
385 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
386 ntf->activation_rf_tech_and_mode);
387 return NCI_STATUS_RF_PROTOCOL_ERROR;
388 }
389
390 return NCI_STATUS_OK;
391}
392
393static void nci_target_auto_activated(struct nci_dev *ndev,
394 struct nci_rf_intf_activated_ntf *ntf)
395{
396 struct nfc_target *target;
397 int rc;
398
399 target = &ndev->targets[ndev->n_targets];
400
401 rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
402 ntf->activation_rf_tech_and_mode,
403 &ntf->rf_tech_specific_params);
404 if (rc)
405 return;
406
407 target->logical_idx = ntf->rf_discovery_id;
408 ndev->n_targets++;
409
410 pr_debug("logical idx %d, n_targets %d\n",
411 target->logical_idx, ndev->n_targets);
412
413 nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
414}
415
416static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
417 struct sk_buff *skb)
418{
419 struct nci_rf_intf_activated_ntf ntf;
420 __u8 *data = skb->data;
421 int err = NCI_STATUS_OK;
422
423 ntf.rf_discovery_id = *data++;
424 ntf.rf_interface = *data++;
425 ntf.rf_protocol = *data++;
426 ntf.activation_rf_tech_and_mode = *data++;
427 ntf.max_data_pkt_payload_size = *data++;
428 ntf.initial_num_credits = *data++;
429 ntf.rf_tech_specific_params_len = *data++;
430
431 pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
432 pr_debug("rf_interface 0x%x\n", ntf.rf_interface);
433 pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
434 pr_debug("activation_rf_tech_and_mode 0x%x\n",
435 ntf.activation_rf_tech_and_mode);
436 pr_debug("max_data_pkt_payload_size 0x%x\n",
437 ntf.max_data_pkt_payload_size);
438 pr_debug("initial_num_credits 0x%x\n",
439 ntf.initial_num_credits);
440 pr_debug("rf_tech_specific_params_len %d\n",
441 ntf.rf_tech_specific_params_len);
442
443 if (ntf.rf_tech_specific_params_len > 0) {
444 switch (ntf.activation_rf_tech_and_mode) {
445 case NCI_NFC_A_PASSIVE_POLL_MODE:
446 data = nci_extract_rf_params_nfca_passive_poll(ndev,
447 &(ntf.rf_tech_specific_params.nfca_poll), data);
448 break;
449
450 case NCI_NFC_B_PASSIVE_POLL_MODE:
451 data = nci_extract_rf_params_nfcb_passive_poll(ndev,
452 &(ntf.rf_tech_specific_params.nfcb_poll), data);
453 break;
454
455 case NCI_NFC_F_PASSIVE_POLL_MODE:
456 data = nci_extract_rf_params_nfcf_passive_poll(ndev,
457 &(ntf.rf_tech_specific_params.nfcf_poll), data);
458 break;
459
460 default:
461 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
462 ntf.activation_rf_tech_and_mode);
463 err = NCI_STATUS_RF_PROTOCOL_ERROR;
464 goto exit;
465 }
466 }
467
468 ntf.data_exch_rf_tech_and_mode = *data++;
469 ntf.data_exch_tx_bit_rate = *data++;
470 ntf.data_exch_rx_bit_rate = *data++;
471 ntf.activation_params_len = *data++;
472
473 pr_debug("data_exch_rf_tech_and_mode 0x%x\n",
474 ntf.data_exch_rf_tech_and_mode);
475 pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate);
476 pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate);
477 pr_debug("activation_params_len %d\n", ntf.activation_params_len);
478
479 if (ntf.activation_params_len > 0) {
480 switch (ntf.rf_interface) {
481 case NCI_RF_INTERFACE_ISO_DEP:
482 err = nci_extract_activation_params_iso_dep(ndev,
483 &ntf, data);
484 break;
485
486 case NCI_RF_INTERFACE_NFC_DEP:
487 err = nci_extract_activation_params_nfc_dep(ndev,
488 &ntf, data);
489 break;
490
491 case NCI_RF_INTERFACE_FRAME:
492
493 break;
494
495 default:
496 pr_err("unsupported rf_interface 0x%x\n",
497 ntf.rf_interface);
498 err = NCI_STATUS_RF_PROTOCOL_ERROR;
499 break;
500 }
501 }
502
503exit:
504 if (err == NCI_STATUS_OK) {
505 ndev->max_data_pkt_payload_size = ntf.max_data_pkt_payload_size;
506 ndev->initial_num_credits = ntf.initial_num_credits;
507
508
509 atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
510
511
512 if (ntf.rf_interface == NCI_RF_INTERFACE_NFC_DEP) {
513 ndev->remote_gb_len = 0;
514
515 if (ntf.activation_params_len > 0) {
516
517 ndev->remote_gb_len = min_t(__u8,
518 (ntf.activation_params
519 .poll_nfc_dep.atr_res_len
520 - NFC_ATR_RES_GT_OFFSET),
521 NFC_MAX_GT_LEN);
522 memcpy(ndev->remote_gb,
523 (ntf.activation_params.poll_nfc_dep
524 .atr_res + NFC_ATR_RES_GT_OFFSET),
525 ndev->remote_gb_len);
526 }
527 }
528 }
529
530 if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
531
532 atomic_set(&ndev->state, NCI_POLL_ACTIVE);
533 if (err == NCI_STATUS_OK)
534 nci_target_auto_activated(ndev, &ntf);
535 } else {
536
537 atomic_set(&ndev->state, NCI_POLL_ACTIVE);
538 nci_req_complete(ndev, err);
539 }
540}
541
542static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
543 struct sk_buff *skb)
544{
545 struct nci_rf_deactivate_ntf *ntf = (void *) skb->data;
546
547 pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
548
549
550 skb_queue_purge(&ndev->tx_q);
551
552
553 if (ndev->rx_data_reassembly) {
554 kfree_skb(ndev->rx_data_reassembly);
555 ndev->rx_data_reassembly = NULL;
556 }
557
558
559 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
560 nci_data_exchange_complete(ndev, NULL, -EIO);
561
562 nci_clear_target_list(ndev);
563 atomic_set(&ndev->state, NCI_IDLE);
564 nci_req_complete(ndev, NCI_STATUS_OK);
565}
566
567void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
568{
569 __u16 ntf_opcode = nci_opcode(skb->data);
570
571 pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
572 nci_pbf(skb->data),
573 nci_opcode_gid(ntf_opcode),
574 nci_opcode_oid(ntf_opcode),
575 nci_plen(skb->data));
576
577
578 skb_pull(skb, NCI_CTRL_HDR_SIZE);
579
580 switch (ntf_opcode) {
581 case NCI_OP_CORE_CONN_CREDITS_NTF:
582 nci_core_conn_credits_ntf_packet(ndev, skb);
583 break;
584
585 case NCI_OP_CORE_GENERIC_ERROR_NTF:
586 nci_core_generic_error_ntf_packet(ndev, skb);
587 break;
588
589 case NCI_OP_CORE_INTF_ERROR_NTF:
590 nci_core_conn_intf_error_ntf_packet(ndev, skb);
591 break;
592
593 case NCI_OP_RF_DISCOVER_NTF:
594 nci_rf_discover_ntf_packet(ndev, skb);
595 break;
596
597 case NCI_OP_RF_INTF_ACTIVATED_NTF:
598 nci_rf_intf_activated_ntf_packet(ndev, skb);
599 break;
600
601 case NCI_OP_RF_DEACTIVATE_NTF:
602 nci_rf_deactivate_ntf_packet(ndev, skb);
603 break;
604
605 default:
606 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode);
607 break;
608 }
609
610 kfree_skb(skb);
611}
612
