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nvme: fix Kconfig description for BLK_DEV_NVME_SCSI
[linux-2.6-block.git] / net / nfc / llcp_core.c
CommitLineData
d646960f
SO		 1/*
2 * Copyright (C) 2011 Intel Corporation. All rights reserved.
966efbfb 3 * Copyright (C) 2014 Marvell International Ltd.
d646960f
SO		 4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
98b32dec 16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
d646960f
SO		 17 */
18
19#define pr_fmt(fmt) "llcp: %s: " fmt, __func__
20
21#include <linux/init.h>
22#include <linux/kernel.h>
23#include <linux/list.h>
24#include <linux/nfc.h>
25
30cc4587 26#include "nfc.h"
d646960f
SO		 27#include "llcp.h"
28
29static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
30
0b51fc56 31static LIST_HEAD(llcp_devices);
d646960f 32
098dafcf
TE		 33static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
34
a69f32af 35void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
d646960f 36{
a69f32af
SO		 37 write_lock(&l->lock);
38 sk_add_node(sk, &l->head);
39 write_unlock(&l->lock);
40}
d646960f 41
a69f32af
SO		 42void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
43{
44 write_lock(&l->lock);
45 sk_del_node_init(sk);
46 write_unlock(&l->lock);
47}
d646960f 48
abd18d43
TE		 49void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
50{
51 sock->remote_rw = LLCP_DEFAULT_RW;
52 sock->remote_miu = LLCP_MAX_MIU + 1;
53}
54
f31652a5
SO		 55static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
56{
57 struct nfc_llcp_local *local = sock->local;
58 struct sk_buff *s, *tmp;
59
60 pr_debug("%p\n", &sock->sk);
61
62 skb_queue_purge(&sock->tx_queue);
63 skb_queue_purge(&sock->tx_pending_queue);
f31652a5
SO		 64
65 if (local == NULL)
66 return;
67
68 /* Search for local pending SKBs that are related to this socket */
69 skb_queue_walk_safe(&local->tx_queue, s, tmp) {
70 if (s->sk != &sock->sk)
71 continue;
72
73 skb_unlink(s, &local->tx_queue);
74 kfree_skb(s);
75 }
76}
77
b436a13d 78static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
3bbc0ceb 79 int err)
a69f32af
SO		 80{
81 struct sock *sk;
b67bfe0d 82 struct hlist_node *tmp;
a69f32af 83 struct nfc_llcp_sock *llcp_sock;
d646960f 84
f31652a5
SO		 85 skb_queue_purge(&local->tx_queue);
86
a69f32af 87 write_lock(&local->sockets.lock);
40c75f81 88
b67bfe0d 89 sk_for_each_safe(sk, tmp, &local->sockets.head) {
a69f32af 90 llcp_sock = nfc_llcp_sock(sk);
d646960f 91
50b78b2a 92 bh_lock_sock(sk);
d646960f 93
f31652a5
SO		 94 nfc_llcp_socket_purge(llcp_sock);
95
a69f32af
SO		 96 if (sk->sk_state == LLCP_CONNECTED)
97 nfc_put_device(llcp_sock->dev);
d646960f 98
a69f32af 99 if (sk->sk_state == LLCP_LISTEN) {
d646960f
SO		 100 struct nfc_llcp_sock *lsk, *n;
101 struct sock *accept_sk;
102
0f450772
SJ		 103 list_for_each_entry_safe(lsk, n,
104 &llcp_sock->accept_queue,
427a2eb1 105 accept_queue) {
d646960f 106 accept_sk = &lsk->sk;
50b78b2a 107 bh_lock_sock(accept_sk);
d646960f
SO		 108
109 nfc_llcp_accept_unlink(accept_sk);
110
3bbc0ceb
SO		 111 if (err)
112 accept_sk->sk_err = err;
d646960f 113 accept_sk->sk_state = LLCP_CLOSED;
3bbc0ceb 114 accept_sk->sk_state_change(sk);
d646960f 115
50b78b2a 116 bh_unlock_sock(accept_sk);
d646960f 117 }
c8512be6
SO		 118 }
119
3bbc0ceb
SO		 120 if (err)
121 sk->sk_err = err;
a69f32af 122 sk->sk_state = LLCP_CLOSED;
3bbc0ceb 123 sk->sk_state_change(sk);
d646960f 124
50b78b2a 125 bh_unlock_sock(sk);
d646960f 126
a69f32af 127 sk_del_node_init(sk);
d646960f
SO		 128 }
129
a69f32af 130 write_unlock(&local->sockets.lock);
e6a3a4bb 131
b436a13d
SO		 132 /* If we still have a device, we keep the RAW sockets alive */
133 if (device == true)
e6a3a4bb
SO		 134 return;
135
136 write_lock(&local->raw_sockets.lock);
137
138 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
139 llcp_sock = nfc_llcp_sock(sk);
140
141 bh_lock_sock(sk);
142
143 nfc_llcp_socket_purge(llcp_sock);
144
3bbc0ceb
SO		 145 if (err)
146 sk->sk_err = err;
e6a3a4bb 147 sk->sk_state = LLCP_CLOSED;
e6a3a4bb
SO		 148 sk->sk_state_change(sk);
149
150 bh_unlock_sock(sk);
151
e6a3a4bb
SO		 152 sk_del_node_init(sk);
153 }
154
155 write_unlock(&local->raw_sockets.lock);
d646960f
SO		 156}
157
c7aa1225
SO		 158struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
159{
160 kref_get(&local->ref);
161
162 return local;
163}
164
c470e319 165static void local_cleanup(struct nfc_llcp_local *local)
c7aa1225 166{
c470e319 167 nfc_llcp_socket_release(local, false, ENXIO);
c7aa1225
SO		 168 del_timer_sync(&local->link_timer);
169 skb_queue_purge(&local->tx_queue);
474fee3d
TH		 170 cancel_work_sync(&local->tx_work);
171 cancel_work_sync(&local->rx_work);
172 cancel_work_sync(&local->timeout_work);
c7aa1225 173 kfree_skb(local->rx_pending);
40213fa8
TE		 174 del_timer_sync(&local->sdreq_timer);
175 cancel_work_sync(&local->sdreq_timeout_work);
d9b8d8e1 176 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
3536da06
SO		 177}
178
179static void local_release(struct kref *ref)
180{
181 struct nfc_llcp_local *local;
182
183 local = container_of(ref, struct nfc_llcp_local, ref);
184
185 list_del(&local->list);
c470e319 186 local_cleanup(local);
c7aa1225
SO		 187 kfree(local);
188}
189
190int nfc_llcp_local_put(struct nfc_llcp_local *local)
191{
a69f32af
SO		 192 if (local == NULL)
193 return 0;
194
c7aa1225
SO		 195 return kref_put(&local->ref, local_release);
196}
197
8f50020e
SO		 198static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
199 u8 ssap, u8 dsap)
200{
201 struct sock *sk;
a8df0f37 202 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
8f50020e
SO		 203
204 pr_debug("ssap dsap %d %d\n", ssap, dsap);
205
206 if (ssap == 0 && dsap == 0)
207 return NULL;
208
209 read_lock(&local->sockets.lock);
210
211 llcp_sock = NULL;
212
b67bfe0d 213 sk_for_each(sk, &local->sockets.head) {
a8df0f37 214 tmp_sock = nfc_llcp_sock(sk);
8f50020e 215
a8df0f37
SO		 216 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
217 llcp_sock = tmp_sock;
8f50020e 218 break;
a8df0f37 219 }
8f50020e
SO		 220 }
221
222 read_unlock(&local->sockets.lock);
223
224 if (llcp_sock == NULL)
225 return NULL;
226
227 sock_hold(&llcp_sock->sk);
228
229 return llcp_sock;
230}
231
232static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
233{
234 sock_put(&sock->sk);
235}
236
d646960f
SO		 237static void nfc_llcp_timeout_work(struct work_struct *work)
238{
239 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
427a2eb1 240 timeout_work);
d646960f
SO		 241
242 nfc_dep_link_down(local->dev);
243}
244
245static void nfc_llcp_symm_timer(unsigned long data)
246{
247 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
248
249 pr_err("SYMM timeout\n");
250
916082b0 251 schedule_work(&local->timeout_work);
d646960f
SO		 252}
253
40213fa8
TE		 254static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
255{
256 unsigned long time;
257 HLIST_HEAD(nl_sdres_list);
258 struct hlist_node *n;
259 struct nfc_llcp_sdp_tlv *sdp;
260 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
261 sdreq_timeout_work);
262
263 mutex_lock(&local->sdreq_lock);
264
265 time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
266
267 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
268 if (time_after(sdp->time, time))
269 continue;
270
271 sdp->sap = LLCP_SDP_UNBOUND;
272
273 hlist_del(&sdp->node);
274
275 hlist_add_head(&sdp->node, &nl_sdres_list);
276 }
277
278 if (!hlist_empty(&local->pending_sdreqs))
279 mod_timer(&local->sdreq_timer,
280 jiffies + msecs_to_jiffies(3 * local->remote_lto));
281
282 mutex_unlock(&local->sdreq_lock);
283
284 if (!hlist_empty(&nl_sdres_list))
285 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
286}
287
288static void nfc_llcp_sdreq_timer(unsigned long data)
289{
290 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
291
292 schedule_work(&local->sdreq_timeout_work);
293}
294
d646960f
SO		 295struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
296{
29e27dd8 297 struct nfc_llcp_local *local;
d646960f 298
29e27dd8 299 list_for_each_entry(local, &llcp_devices, list)
d646960f
SO		 300 if (local->dev == dev)
301 return local;
302
303 pr_debug("No device found\n");
304
305 return NULL;
306}
307
308static char *wks[] = {
309 NULL,
310 NULL, /* SDP */
311 "urn:nfc:sn:ip",
312 "urn:nfc:sn:obex",
313 "urn:nfc:sn:snep",
314};
315
316static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
317{
318 int sap, num_wks;
319
320 pr_debug("%s\n", service_name);
321
322 if (service_name == NULL)
323 return -EINVAL;
324
325 num_wks = ARRAY_SIZE(wks);
326
427a2eb1 327 for (sap = 0; sap < num_wks; sap++) {
d646960f
SO		 328 if (wks[sap] == NULL)
329 continue;
330
331 if (strncmp(wks[sap], service_name, service_name_len) == 0)
332 return sap;
333 }
334
335 return -EINVAL;
336}
337
8f50020e
SO		 338static
339struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
340 u8 *sn, size_t sn_len)
341{
342 struct sock *sk;
8f50020e
SO		 343 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
344
345 pr_debug("sn %zd %p\n", sn_len, sn);
346
347 if (sn == NULL || sn_len == 0)
348 return NULL;
349
350 read_lock(&local->sockets.lock);
351
352 llcp_sock = NULL;
353
b67bfe0d 354 sk_for_each(sk, &local->sockets.head) {
8f50020e
SO		 355 tmp_sock = nfc_llcp_sock(sk);
356
357 pr_debug("llcp sock %p\n", tmp_sock);
358
54292d64
SO		 359 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
360 tmp_sock->sk.sk_state != LLCP_LISTEN)
361 continue;
362
363 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
364 tmp_sock->sk.sk_state != LLCP_BOUND)
8f50020e
SO		 365 continue;
366
367 if (tmp_sock->service_name == NULL ||
368 tmp_sock->service_name_len == 0)
369 continue;
370
371 if (tmp_sock->service_name_len != sn_len)
372 continue;
373
374 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
375 llcp_sock = tmp_sock;
376 break;
377 }
378 }
379
380 read_unlock(&local->sockets.lock);
381
382 pr_debug("Found llcp sock %p\n", llcp_sock);
383
384 return llcp_sock;
385}
386
d646960f 387u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
427a2eb1 388 struct nfc_llcp_sock *sock)
d646960f
SO		 389{
390 mutex_lock(&local->sdp_lock);
391
392 if (sock->service_name != NULL && sock->service_name_len > 0) {
393 int ssap = nfc_llcp_wks_sap(sock->service_name,
427a2eb1 394 sock->service_name_len);
d646960f
SO		 395
396 if (ssap > 0) {
397 pr_debug("WKS %d\n", ssap);
398
399 /* This is a WKS, let's check if it's free */
400 if (local->local_wks & BIT(ssap)) {
401 mutex_unlock(&local->sdp_lock);
402
403 return LLCP_SAP_MAX;
404 }
405
1762c17c 406 set_bit(ssap, &local->local_wks);
d646960f
SO		 407 mutex_unlock(&local->sdp_lock);
408
409 return ssap;
410 }
411
412 /*
8f50020e
SO		 413 * Check if there already is a non WKS socket bound
414 * to this service name.
d646960f 415 */
8f50020e
SO		 416 if (nfc_llcp_sock_from_sn(local, sock->service_name,
417 sock->service_name_len) != NULL) {
d646960f
SO		 418 mutex_unlock(&local->sdp_lock);
419
420 return LLCP_SAP_MAX;
421 }
422
d646960f
SO		 423 mutex_unlock(&local->sdp_lock);
424
8f50020e 425 return LLCP_SDP_UNBOUND;
d646960f 426
ebbb16d9
SO		 427 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
428 if (!test_bit(sock->ssap, &local->local_wks)) {
429 set_bit(sock->ssap, &local->local_wks);
430 mutex_unlock(&local->sdp_lock);
d646960f 431
ebbb16d9 432 return sock->ssap;
d646960f
SO		 433 }
434 }
435
436 mutex_unlock(&local->sdp_lock);
437
438 return LLCP_SAP_MAX;
439}
440
441u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
442{
443 u8 local_ssap;
444
445 mutex_lock(&local->sdp_lock);
446
447 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
448 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
449 mutex_unlock(&local->sdp_lock);
450 return LLCP_SAP_MAX;
451 }
452
1762c17c 453 set_bit(local_ssap, &local->local_sap);
d646960f
SO		 454
455 mutex_unlock(&local->sdp_lock);
456
457 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
458}
459
460void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
461{
462 u8 local_ssap;
463 unsigned long *sdp;
464
465 if (ssap < LLCP_WKS_NUM_SAP) {
466 local_ssap = ssap;
467 sdp = &local->local_wks;
468 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
8f50020e
SO		 469 atomic_t *client_cnt;
470
d646960f
SO		 471 local_ssap = ssap - LLCP_WKS_NUM_SAP;
472 sdp = &local->local_sdp;
8f50020e
SO		 473 client_cnt = &local->local_sdp_cnt[local_ssap];
474
475 pr_debug("%d clients\n", atomic_read(client_cnt));
476
477 mutex_lock(&local->sdp_lock);
478
479 if (atomic_dec_and_test(client_cnt)) {
480 struct nfc_llcp_sock *l_sock;
481
482 pr_debug("No more clients for SAP %d\n", ssap);
483
484 clear_bit(local_ssap, sdp);
485
486 /* Find the listening sock and set it back to UNBOUND */
487 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
488 if (l_sock) {
489 l_sock->ssap = LLCP_SDP_UNBOUND;
490 nfc_llcp_sock_put(l_sock);
491 }
492 }
493
494 mutex_unlock(&local->sdp_lock);
495
496 return;
d646960f
SO		 497 } else if (ssap < LLCP_MAX_SAP) {
498 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
499 sdp = &local->local_sap;
500 } else {
501 return;
502 }
503
504 mutex_lock(&local->sdp_lock);
505
1762c17c 506 clear_bit(local_ssap, sdp);
d646960f
SO		 507
508 mutex_unlock(&local->sdp_lock);
509}
510
8f50020e
SO		 511static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
512{
513 u8 ssap;
514
515 mutex_lock(&local->sdp_lock);
516
517 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
518 if (ssap == LLCP_SDP_NUM_SAP) {
519 mutex_unlock(&local->sdp_lock);
520
521 return LLCP_SAP_MAX;
522 }
523
524 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
525
526 set_bit(ssap, &local->local_sdp);
527
528 mutex_unlock(&local->sdp_lock);
529
530 return LLCP_WKS_NUM_SAP + ssap;
531}
532
d646960f
SO		 533static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
534{
535 u8 *gb_cur, *version_tlv, version, version_length;
52feb444 536 u8 *lto_tlv, lto_length;
d646960f 537 u8 *wks_tlv, wks_length;
56d5876a 538 u8 *miux_tlv, miux_length;
4ca546e5 539 __be16 wks = cpu_to_be16(local->local_wks);
d646960f 540 u8 gb_len = 0;
52da2449 541 int ret = 0;
d646960f
SO		 542
543 version = LLCP_VERSION_11;
544 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
427a2eb1 545 1, &version_length);
d646960f
SO		 546 gb_len += version_length;
547
52feb444 548 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
d646960f
SO		 549 gb_len += lto_length;
550
551 pr_debug("Local wks 0x%lx\n", local->local_wks);
4ca546e5 552 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
d646960f
SO		 553 gb_len += wks_length;
554
52feb444 555 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
56d5876a
SO		 556 &miux_length);
557 gb_len += miux_length;
558
d646960f
SO		 559 gb_len += ARRAY_SIZE(llcp_magic);
560
561 if (gb_len > NFC_MAX_GT_LEN) {
52da2449
WY		 562 ret = -EINVAL;
563 goto out;
d646960f
SO		 564 }
565
566 gb_cur = local->gb;
567
568 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
569 gb_cur += ARRAY_SIZE(llcp_magic);
570
571 memcpy(gb_cur, version_tlv, version_length);
572 gb_cur += version_length;
573
574 memcpy(gb_cur, lto_tlv, lto_length);
575 gb_cur += lto_length;
576
577 memcpy(gb_cur, wks_tlv, wks_length);
578 gb_cur += wks_length;
579
56d5876a
SO		 580 memcpy(gb_cur, miux_tlv, miux_length);
581 gb_cur += miux_length;
582
52da2449
WY		 583 local->gb_len = gb_len;
584
585out:
d646960f
SO		 586 kfree(version_tlv);
587 kfree(lto_tlv);
52da2449
WY		 588 kfree(wks_tlv);
589 kfree(miux_tlv);
d646960f 590
52da2449 591 return ret;
d646960f
SO		 592}
593
b8e7a06d
SO		 594u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
595{
596 struct nfc_llcp_local *local;
597
598 local = nfc_llcp_find_local(dev);
599 if (local == NULL) {
600 *general_bytes_len = 0;
601 return NULL;
602 }
603
604 nfc_llcp_build_gb(local);
605
606 *general_bytes_len = local->gb_len;
607
608 return local->gb;
609}
610
d646960f
SO		 611int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
612{
3143a4ca
AL		 613 struct nfc_llcp_local *local;
614
615 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
616 return -EINVAL;
d646960f 617
3143a4ca 618 local = nfc_llcp_find_local(dev);
d646960f
SO		 619 if (local == NULL) {
620 pr_err("No LLCP device\n");
621 return -ENODEV;
622 }
623
624 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
625 memcpy(local->remote_gb, gb, gb_len);
626 local->remote_gb_len = gb_len;
627
d646960f
SO		 628 if (memcmp(local->remote_gb, llcp_magic, 3)) {
629 pr_err("MAC does not support LLCP\n");
630 return -EINVAL;
631 }
632
7a06e586
SO		 633 return nfc_llcp_parse_gb_tlv(local,
634 &local->remote_gb[3],
635 local->remote_gb_len - 3);
d646960f
SO		 636}
637
d646960f
SO		 638static u8 nfc_llcp_dsap(struct sk_buff *pdu)
639{
640 return (pdu->data[0] & 0xfc) >> 2;
641}
642
643static u8 nfc_llcp_ptype(struct sk_buff *pdu)
644{
645 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
646}
647
648static u8 nfc_llcp_ssap(struct sk_buff *pdu)
649{
650 return pdu->data[1] & 0x3f;
651}
652
653static u8 nfc_llcp_ns(struct sk_buff *pdu)
654{
655 return pdu->data[2] >> 4;
656}
657
658static u8 nfc_llcp_nr(struct sk_buff *pdu)
659{
660 return pdu->data[2] & 0xf;
661}
662
663static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
664{
279cf174 665 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
d646960f
SO		 666 sock->send_n = (sock->send_n + 1) % 16;
667 sock->recv_ack_n = (sock->recv_n - 1) % 16;
668}
669
4463523b
TE		 670void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
671 struct sk_buff *skb, u8 direction)
672{
4463523b
TE		 673 struct sk_buff *skb_copy = NULL, *nskb;
674 struct sock *sk;
675 u8 *data;
676
677 read_lock(&local->raw_sockets.lock);
678
b67bfe0d 679 sk_for_each(sk, &local->raw_sockets.head) {
4463523b
TE		 680 if (sk->sk_state != LLCP_BOUND)
681 continue;
682
683 if (skb_copy == NULL) {
bad93e9d
OP		 684 skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
685 GFP_ATOMIC, true);
4463523b
TE		 686
687 if (skb_copy == NULL)
688 continue;
689
57be1f3f 690 data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
4463523b
TE		 691
692 data[0] = local->dev ? local->dev->idx : 0xFF;
57be1f3f
HT		 693 data[1] = direction & 0x01;
694 data[1] |= (RAW_PAYLOAD_LLCP << 1);
4463523b
TE		 695 }
696
697 nskb = skb_clone(skb_copy, GFP_ATOMIC);
698 if (!nskb)
699 continue;
700
701 if (sock_queue_rcv_skb(sk, nskb))
702 kfree_skb(nskb);
703 }
704
705 read_unlock(&local->raw_sockets.lock);
706
707 kfree_skb(skb_copy);
708}
709
84457960
SO		 710static void nfc_llcp_tx_work(struct work_struct *work)
711{
712 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
713 tx_work);
714 struct sk_buff *skb;
715 struct sock *sk;
716 struct nfc_llcp_sock *llcp_sock;
717
718 skb = skb_dequeue(&local->tx_queue);
719 if (skb != NULL) {
720 sk = skb->sk;
721 llcp_sock = nfc_llcp_sock(sk);
a6a0915f
SO		 722
723 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
f1b79dc8 724 kfree_skb(skb);
a6a0915f 725 nfc_llcp_send_symm(local->dev);
2635a4bd
SO		 726 } else if (llcp_sock && !llcp_sock->remote_ready) {
727 skb_queue_head(&local->tx_queue, skb);
728 nfc_llcp_send_symm(local->dev);
a6a0915f 729 } else {
be02b6b6
SO		 730 struct sk_buff *copy_skb = NULL;
731 u8 ptype = nfc_llcp_ptype(skb);
84457960
SO		 732 int ret;
733
734 pr_debug("Sending pending skb\n");
735 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
736 DUMP_PREFIX_OFFSET, 16, 1,
737 skb->data, skb->len, true);
738
17f7ae16
TE		 739 if (ptype == LLCP_PDU_DISC && sk != NULL &&
740 sk->sk_state == LLCP_DISCONNECTING) {
741 nfc_llcp_sock_unlink(&local->sockets, sk);
742 sock_orphan(sk);
743 sock_put(sk);
744 }
745
be02b6b6
SO		 746 if (ptype == LLCP_PDU_I)
747 copy_skb = skb_copy(skb, GFP_ATOMIC);
748
2c2d45bd
TE		 749 __net_timestamp(skb);
750
4463523b 751 nfc_llcp_send_to_raw_sock(local, skb,
57be1f3f 752 NFC_DIRECTION_TX);
4463523b 753
84457960
SO		 754 ret = nfc_data_exchange(local->dev, local->target_idx,
755 skb, nfc_llcp_recv, local);
756
be02b6b6
SO		 757 if (ret) {
758 kfree_skb(copy_skb);
759 goto out;
84457960 760 }
be02b6b6
SO		 761
762 if (ptype == LLCP_PDU_I && copy_skb)
763 skb_queue_tail(&llcp_sock->tx_pending_queue,
764 copy_skb);
84457960
SO		 765 }
766 } else {
767 nfc_llcp_send_symm(local->dev);
768 }
769
be02b6b6 770out:
84457960
SO		 771 mod_timer(&local->link_timer,
772 jiffies + msecs_to_jiffies(2 * local->remote_lto));
773}
774
a69f32af
SO		 775static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
776 u8 ssap)
777{
778 struct sock *sk;
779 struct nfc_llcp_sock *llcp_sock;
a69f32af
SO		 780
781 read_lock(&local->connecting_sockets.lock);
782
b67bfe0d 783 sk_for_each(sk, &local->connecting_sockets.head) {
a69f32af
SO		 784 llcp_sock = nfc_llcp_sock(sk);
785
5a0f6f3b
SO		 786 if (llcp_sock->ssap == ssap) {
787 sock_hold(&llcp_sock->sk);
a69f32af 788 goto out;
5a0f6f3b 789 }
a69f32af
SO		 790 }
791
792 llcp_sock = NULL;
793
794out:
795 read_unlock(&local->connecting_sockets.lock);
796
a69f32af
SO		 797 return llcp_sock;
798}
799
a69f32af
SO		 800static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
801 u8 *sn, size_t sn_len)
802{
a69f32af
SO		 803 struct nfc_llcp_sock *llcp_sock;
804
8f50020e 805 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
d646960f 806
a69f32af
SO		 807 if (llcp_sock == NULL)
808 return NULL;
d646960f 809
a69f32af
SO		 810 sock_hold(&llcp_sock->sk);
811
812 return llcp_sock;
d646960f
SO		 813}
814
d646960f
SO		 815static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
816{
817 u8 *tlv = &skb->data[2], type, length;
818 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
819
820 while (offset < tlv_array_len) {
821 type = tlv[0];
822 length = tlv[1];
823
824 pr_debug("type 0x%x length %d\n", type, length);
825
826 if (type == LLCP_TLV_SN) {
827 *sn_len = length;
828 return &tlv[2];
829 }
830
831 offset += length + 2;
832 tlv += length + 2;
833 }
834
835 return NULL;
836}
837
968272bf
SO		 838static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
839 struct sk_buff *skb)
840{
841 struct nfc_llcp_sock *llcp_sock;
842 struct nfc_llcp_ui_cb *ui_cb;
843 u8 dsap, ssap;
844
845 dsap = nfc_llcp_dsap(skb);
846 ssap = nfc_llcp_ssap(skb);
847
848 ui_cb = nfc_llcp_ui_skb_cb(skb);
849 ui_cb->dsap = dsap;
850 ui_cb->ssap = ssap;
851
968272bf
SO		 852 pr_debug("%d %d\n", dsap, ssap);
853
854 /* We're looking for a bound socket, not a client one */
855 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
856 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
857 return;
858
859 /* There is no sequence with UI frames */
860 skb_pull(skb, LLCP_HEADER_SIZE);
1727cf93
SO		 861 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
862 /*
863 * UI frames will be freed from the socket layer, so we
864 * need to keep them alive until someone receives them.
865 */
866 skb_get(skb);
867 } else {
868 pr_err("Receive queue is full\n");
968272bf
SO		 869 }
870
871 nfc_llcp_sock_put(llcp_sock);
872}
873
d646960f 874static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
427a2eb1 875 struct sk_buff *skb)
d646960f
SO		 876{
877 struct sock *new_sk, *parent;
878 struct nfc_llcp_sock *sock, *new_sock;
a69f32af 879 u8 dsap, ssap, reason;
d646960f
SO		 880
881 dsap = nfc_llcp_dsap(skb);
882 ssap = nfc_llcp_ssap(skb);
883
884 pr_debug("%d %d\n", dsap, ssap);
885
d646960f 886 if (dsap != LLCP_SAP_SDP) {
a69f32af
SO		 887 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
888 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
d646960f
SO		 889 reason = LLCP_DM_NOBOUND;
890 goto fail;
891 }
d646960f
SO		 892 } else {
893 u8 *sn;
894 size_t sn_len;
895
896 sn = nfc_llcp_connect_sn(skb, &sn_len);
897 if (sn == NULL) {
898 reason = LLCP_DM_NOBOUND;
899 goto fail;
900 }
901
902 pr_debug("Service name length %zu\n", sn_len);
903
a69f32af
SO		 904 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
905 if (sock == NULL) {
906 reason = LLCP_DM_NOBOUND;
907 goto fail;
d646960f 908 }
d646960f
SO		 909 }
910
a69f32af 911 lock_sock(&sock->sk);
d646960f 912
d646960f
SO		 913 parent = &sock->sk;
914
915 if (sk_acceptq_is_full(parent)) {
916 reason = LLCP_DM_REJ;
917 release_sock(&sock->sk);
918 sock_put(&sock->sk);
919 goto fail;
920 }
921
8f50020e
SO		 922 if (sock->ssap == LLCP_SDP_UNBOUND) {
923 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
924
925 pr_debug("First client, reserving %d\n", ssap);
926
927 if (ssap == LLCP_SAP_MAX) {
928 reason = LLCP_DM_REJ;
929 release_sock(&sock->sk);
930 sock_put(&sock->sk);
931 goto fail;
932 }
933
934 sock->ssap = ssap;
935 }
936
11aa9c28 937 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
d646960f
SO		 938 if (new_sk == NULL) {
939 reason = LLCP_DM_REJ;
940 release_sock(&sock->sk);
941 sock_put(&sock->sk);
942 goto fail;
943 }
944
945 new_sock = nfc_llcp_sock(new_sk);
946 new_sock->dev = local->dev;
c7aa1225 947 new_sock->local = nfc_llcp_local_get(local);
06d44f80
SO		 948 new_sock->rw = sock->rw;
949 new_sock->miux = sock->miux;
d646960f 950 new_sock->nfc_protocol = sock->nfc_protocol;
d646960f 951 new_sock->dsap = ssap;
025f1520 952 new_sock->target_idx = local->target_idx;
d646960f 953 new_sock->parent = parent;
8f50020e
SO		 954 new_sock->ssap = sock->ssap;
955 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
956 atomic_t *client_count;
957
958 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
959
960 client_count =
961 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
962
963 atomic_inc(client_count);
964 new_sock->reserved_ssap = sock->ssap;
965 }
d646960f 966
7a06e586
SO		 967 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
968 skb->len - LLCP_HEADER_SIZE);
969
d646960f
SO		 970 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
971
a69f32af 972 nfc_llcp_sock_link(&local->sockets, new_sk);
d646960f
SO		 973
974 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
975
976 nfc_get_device(local->dev->idx);
977
978 new_sk->sk_state = LLCP_CONNECTED;
979
980 /* Wake the listening processes */
676d2369 981 parent->sk_data_ready(parent);
d646960f
SO		 982
983 /* Send CC */
984 nfc_llcp_send_cc(new_sock);
985
986 release_sock(&sock->sk);
987 sock_put(&sock->sk);
988
989 return;
990
991fail:
992 /* Send DM */
993 nfc_llcp_send_dm(local, dsap, ssap, reason);
d646960f
SO		 994}
995
d094afa1 996int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
4722d2b7 997{
d094afa1 998 int nr_frames = 0;
4722d2b7
SO		 999 struct nfc_llcp_local *local = sock->local;
1000
1001 pr_debug("Remote ready %d tx queue len %d remote rw %d",
427a2eb1 1002 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
e4306bec 1003 sock->remote_rw);
4722d2b7
SO		 1004
1005 /* Try to queue some I frames for transmission */
1006 while (sock->remote_ready &&
e4306bec 1007 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
84457960 1008 struct sk_buff *pdu;
4722d2b7
SO		 1009
1010 pdu = skb_dequeue(&sock->tx_queue);
1011 if (pdu == NULL)
1012 break;
1013
1014 /* Update N(S)/N(R) */
1015 nfc_llcp_set_nrns(sock, pdu);
1016
4722d2b7 1017 skb_queue_tail(&local->tx_queue, pdu);
d094afa1 1018 nr_frames++;
4722d2b7 1019 }
d094afa1
SO		 1020
1021 return nr_frames;
4722d2b7
SO		 1022}
1023
d646960f 1024static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
427a2eb1 1025 struct sk_buff *skb)
d646960f
SO		 1026{
1027 struct nfc_llcp_sock *llcp_sock;
1028 struct sock *sk;
1029 u8 dsap, ssap, ptype, ns, nr;
1030
1031 ptype = nfc_llcp_ptype(skb);
1032 dsap = nfc_llcp_dsap(skb);
1033 ssap = nfc_llcp_ssap(skb);
1034 ns = nfc_llcp_ns(skb);
1035 nr = nfc_llcp_nr(skb);
1036
1037 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1038
1039 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1040 if (llcp_sock == NULL) {
1041 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1042 return;
1043 }
1044
1045 sk = &llcp_sock->sk;
1046 lock_sock(sk);
1047 if (sk->sk_state == LLCP_CLOSED) {
1048 release_sock(sk);
1049 nfc_llcp_sock_put(llcp_sock);
1050 }
1051
d646960f
SO		 1052 /* Pass the payload upstream */
1053 if (ptype == LLCP_PDU_I) {
1054 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1055
53aef920
SO		 1056 if (ns == llcp_sock->recv_n)
1057 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1058 else
1059 pr_err("Received out of sequence I PDU\n");
1060
d646960f 1061 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1727cf93
SO		 1062 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1063 /*
1064 * I frames will be freed from the socket layer, so we
1065 * need to keep them alive until someone receives them.
1066 */
1067 skb_get(skb);
1068 } else {
1069 pr_err("Receive queue is full\n");
d646960f
SO		 1070 }
1071 }
1072
1073 /* Remove skbs from the pending queue */
1074 if (llcp_sock->send_ack_n != nr) {
1075 struct sk_buff *s, *tmp;
28981491 1076 u8 n;
d646960f
SO		 1077
1078 llcp_sock->send_ack_n = nr;
1079
84457960
SO		 1080 /* Remove and free all skbs until ns == nr */
1081 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
28981491
WR		 1082 n = nfc_llcp_ns(s);
1083
84457960
SO		 1084 skb_unlink(s, &llcp_sock->tx_pending_queue);
1085 kfree_skb(s);
1086
28981491 1087 if (n == nr)
84457960
SO		 1088 break;
1089 }
1090
1091 /* Re-queue the remaining skbs for transmission */
1092 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1093 s, tmp) {
1094 skb_unlink(s, &llcp_sock->tx_pending_queue);
1095 skb_queue_head(&local->tx_queue, s);
1096 }
d646960f
SO		 1097 }
1098
53aef920
SO		 1099 if (ptype == LLCP_PDU_RR)
1100 llcp_sock->remote_ready = true;
427a2eb1 1101 else if (ptype == LLCP_PDU_RNR)
53aef920
SO		 1102 llcp_sock->remote_ready = false;
1103
56af2568 1104 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
d094afa1 1105 nfc_llcp_send_rr(llcp_sock);
d646960f
SO		 1106
1107 release_sock(sk);
1108 nfc_llcp_sock_put(llcp_sock);
1109}
1110
1111static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
427a2eb1 1112 struct sk_buff *skb)
d646960f
SO		 1113{
1114 struct nfc_llcp_sock *llcp_sock;
1115 struct sock *sk;
1116 u8 dsap, ssap;
1117
1118 dsap = nfc_llcp_dsap(skb);
1119 ssap = nfc_llcp_ssap(skb);
1120
6d2cd978
SO		 1121 if ((dsap == 0) && (ssap == 0)) {
1122 pr_debug("Connection termination");
1123 nfc_dep_link_down(local->dev);
1124 return;
1125 }
1126
d646960f
SO		 1127 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1128 if (llcp_sock == NULL) {
1129 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1130 return;
1131 }
1132
1133 sk = &llcp_sock->sk;
1134 lock_sock(sk);
f31652a5
SO		 1135
1136 nfc_llcp_socket_purge(llcp_sock);
1137
d646960f
SO		 1138 if (sk->sk_state == LLCP_CLOSED) {
1139 release_sock(sk);
1140 nfc_llcp_sock_put(llcp_sock);
1141 }
1142
d646960f
SO		 1143 if (sk->sk_state == LLCP_CONNECTED) {
1144 nfc_put_device(local->dev);
1145 sk->sk_state = LLCP_CLOSED;
1146 sk->sk_state_change(sk);
1147 }
1148
1149 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1150
1151 release_sock(sk);
1152 nfc_llcp_sock_put(llcp_sock);
1153}
1154
427a2eb1 1155static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
d646960f
SO		 1156{
1157 struct nfc_llcp_sock *llcp_sock;
ff353d86 1158 struct sock *sk;
d646960f
SO		 1159 u8 dsap, ssap;
1160
d646960f
SO		 1161 dsap = nfc_llcp_dsap(skb);
1162 ssap = nfc_llcp_ssap(skb);
1163
a69f32af 1164 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
d646960f
SO		 1165 if (llcp_sock == NULL) {
1166 pr_err("Invalid CC\n");
1167 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1168
1169 return;
1170 }
1171
ff353d86 1172 sk = &llcp_sock->sk;
d646960f 1173
a69f32af
SO		 1174 /* Unlink from connecting and link to the client array */
1175 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1176 nfc_llcp_sock_link(&local->sockets, sk);
1177 llcp_sock->dsap = ssap;
1178
7a06e586
SO		 1179 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1180 skb->len - LLCP_HEADER_SIZE);
d646960f 1181
ff353d86
SO		 1182 sk->sk_state = LLCP_CONNECTED;
1183 sk->sk_state_change(sk);
1184
d646960f
SO		 1185 nfc_llcp_sock_put(llcp_sock);
1186}
1187
5c0560b7
SO		 1188static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1189{
1190 struct nfc_llcp_sock *llcp_sock;
1191 struct sock *sk;
1192 u8 dsap, ssap, reason;
1193
1194 dsap = nfc_llcp_dsap(skb);
1195 ssap = nfc_llcp_ssap(skb);
1196 reason = skb->data[2];
1197
1198 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1199
1200 switch (reason) {
1201 case LLCP_DM_NOBOUND:
1202 case LLCP_DM_REJ:
1203 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1204 break;
1205
1206 default:
1207 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1208 break;
1209 }
1210
1211 if (llcp_sock == NULL) {
a8df0f37 1212 pr_debug("Already closed\n");
5c0560b7
SO		 1213 return;
1214 }
1215
1216 sk = &llcp_sock->sk;
1217
1218 sk->sk_err = ENXIO;
1219 sk->sk_state = LLCP_CLOSED;
1220 sk->sk_state_change(sk);
1221
1222 nfc_llcp_sock_put(llcp_sock);
5c0560b7
SO		 1223}
1224
19cfe584
SO		 1225static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1226 struct sk_buff *skb)
1227{
1228 struct nfc_llcp_sock *llcp_sock;
1229 u8 dsap, ssap, *tlv, type, length, tid, sap;
1230 u16 tlv_len, offset;
1231 char *service_name;
1232 size_t service_name_len;
e0ae7bac
TE		 1233 struct nfc_llcp_sdp_tlv *sdp;
1234 HLIST_HEAD(llc_sdres_list);
1235 size_t sdres_tlvs_len;
d9b8d8e1 1236 HLIST_HEAD(nl_sdres_list);
19cfe584
SO		 1237
1238 dsap = nfc_llcp_dsap(skb);
1239 ssap = nfc_llcp_ssap(skb);
1240
1241 pr_debug("%d %d\n", dsap, ssap);
1242
1243 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1244 pr_err("Wrong SNL SAP\n");
1245 return;
1246 }
1247
1248 tlv = &skb->data[LLCP_HEADER_SIZE];
1249 tlv_len = skb->len - LLCP_HEADER_SIZE;
1250 offset = 0;
e0ae7bac 1251 sdres_tlvs_len = 0;
19cfe584 1252
0f450772 1253 while (offset < tlv_len) {
19cfe584
SO		 1254 type = tlv[0];
1255 length = tlv[1];
1256
1257 switch (type) {
1258 case LLCP_TLV_SDREQ:
1259 tid = tlv[2];
1260 service_name = (char *) &tlv[3];
1261 service_name_len = length - 1;
1262
e6904081 1263 pr_debug("Looking for %.16s\n", service_name);
19cfe584
SO		 1264
1265 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1266 !strncmp(service_name, "urn:nfc:sn:sdp",
1267 service_name_len)) {
1268 sap = 1;
e0ae7bac 1269 goto add_snl;
e6904081
SO		 1270 }
1271
1272 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1273 service_name_len);
1274 if (!llcp_sock) {
1275 sap = 0;
e0ae7bac 1276 goto add_snl;
e6904081
SO		 1277 }
1278
1279 /*
1280 * We found a socket but its ssap has not been reserved
1281 * yet. We need to assign it for good and send a reply.
1282 * The ssap will be freed when the socket is closed.
1283 */
1284 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1285 atomic_t *client_count;
1286
1287 sap = nfc_llcp_reserve_sdp_ssap(local);
1288
1289 pr_debug("Reserving %d\n", sap);
1290
1291 if (sap == LLCP_SAP_MAX) {
1292 sap = 0;
e0ae7bac 1293 goto add_snl;
e6904081
SO		 1294 }
1295
1296 client_count =
1297 &local->local_sdp_cnt[sap -
1298 LLCP_WKS_NUM_SAP];
1299
1300 atomic_inc(client_count);
1301
1302 llcp_sock->ssap = sap;
1303 llcp_sock->reserved_ssap = sap;
19cfe584 1304 } else {
e6904081 1305 sap = llcp_sock->ssap;
19cfe584
SO		 1306 }
1307
e6904081
SO		 1308 pr_debug("%p %d\n", llcp_sock, sap);
1309
e0ae7bac
TE		 1310add_snl:
1311 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1312 if (sdp == NULL)
1313 goto exit;
1314
1315 sdres_tlvs_len += sdp->tlv_len;
1316 hlist_add_head(&sdp->node, &llc_sdres_list);
19cfe584
SO		 1317 break;
1318
d9b8d8e1
TE		 1319 case LLCP_TLV_SDRES:
1320 mutex_lock(&local->sdreq_lock);
1321
1322 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1323
1324 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1325 if (sdp->tid != tlv[2])
1326 continue;
1327
1328 sdp->sap = tlv[3];
1329
1330 pr_debug("Found: uri=%s, sap=%d\n",
1331 sdp->uri, sdp->sap);
1332
1333 hlist_del(&sdp->node);
1334
1335 hlist_add_head(&sdp->node, &nl_sdres_list);
1336
1337 break;
1338 }
1339
1340 mutex_unlock(&local->sdreq_lock);
1341 break;
1342
19cfe584
SO		 1343 default:
1344 pr_err("Invalid SNL tlv value 0x%x\n", type);
1345 break;
1346 }
1347
1348 offset += length + 2;
1349 tlv += length + 2;
1350 }
e0ae7bac
TE		 1351
1352exit:
d9b8d8e1
TE		 1353 if (!hlist_empty(&nl_sdres_list))
1354 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1355
e0ae7bac
TE		 1356 if (!hlist_empty(&llc_sdres_list))
1357 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
19cfe584
SO		 1358}
1359
098dafcf 1360static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
d646960f 1361{
098dafcf
TE		 1362 u8 ptype;
1363 u16 pdu_len;
1364 struct sk_buff *new_skb;
d646960f 1365
098dafcf
TE		 1366 if (skb->len <= LLCP_HEADER_SIZE) {
1367 pr_err("Malformed AGF PDU\n");
d646960f
SO		 1368 return;
1369 }
1370
098dafcf
TE		 1371 skb_pull(skb, LLCP_HEADER_SIZE);
1372
1373 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1374 pdu_len = skb->data[0] << 8 | skb->data[1];
1375
1376 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1377
1378 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1379 pr_err("Malformed AGF PDU\n");
1380 return;
1381 }
1382
1383 ptype = nfc_llcp_ptype(skb);
1384
1385 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1386 goto next;
1387
1388 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1389 if (new_skb == NULL) {
1390 pr_err("Could not allocate PDU\n");
1391 return;
1392 }
1393
1394 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1395
1396 nfc_llcp_rx_skb(local, new_skb);
1397
1398 kfree_skb(new_skb);
1399next:
1400 skb_pull(skb, pdu_len);
1401 }
1402}
1403
1404static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1405{
1406 u8 dsap, ssap, ptype;
1407
d646960f
SO		 1408 ptype = nfc_llcp_ptype(skb);
1409 dsap = nfc_llcp_dsap(skb);
1410 ssap = nfc_llcp_ssap(skb);
1411
1412 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1413
4be646ec
SO		 1414 if (ptype != LLCP_PDU_SYMM)
1415 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1416 16, 1, skb->data, skb->len, true);
1417
d646960f
SO		 1418 switch (ptype) {
1419 case LLCP_PDU_SYMM:
1420 pr_debug("SYMM\n");
1421 break;
1422
968272bf
SO		 1423 case LLCP_PDU_UI:
1424 pr_debug("UI\n");
1425 nfc_llcp_recv_ui(local, skb);
1426 break;
1427
d646960f
SO		 1428 case LLCP_PDU_CONNECT:
1429 pr_debug("CONNECT\n");
1430 nfc_llcp_recv_connect(local, skb);
1431 break;
1432
1433 case LLCP_PDU_DISC:
1434 pr_debug("DISC\n");
1435 nfc_llcp_recv_disc(local, skb);
1436 break;
1437
1438 case LLCP_PDU_CC:
1439 pr_debug("CC\n");
1440 nfc_llcp_recv_cc(local, skb);
1441 break;
1442
5c0560b7
SO		 1443 case LLCP_PDU_DM:
1444 pr_debug("DM\n");
1445 nfc_llcp_recv_dm(local, skb);
1446 break;
1447
19cfe584
SO		 1448 case LLCP_PDU_SNL:
1449 pr_debug("SNL\n");
1450 nfc_llcp_recv_snl(local, skb);
1451 break;
1452
d646960f
SO		 1453 case LLCP_PDU_I:
1454 case LLCP_PDU_RR:
53aef920 1455 case LLCP_PDU_RNR:
d646960f
SO		 1456 pr_debug("I frame\n");
1457 nfc_llcp_recv_hdlc(local, skb);
1458 break;
1459
098dafcf
TE		 1460 case LLCP_PDU_AGF:
1461 pr_debug("AGF frame\n");
1462 nfc_llcp_recv_agf(local, skb);
1463 break;
d646960f 1464 }
098dafcf
TE		 1465}
1466
1467static void nfc_llcp_rx_work(struct work_struct *work)
1468{
1469 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1470 rx_work);
1471 struct sk_buff *skb;
1472
1473 skb = local->rx_pending;
1474 if (skb == NULL) {
1475 pr_debug("No pending SKB\n");
1476 return;
1477 }
1478
1479 __net_timestamp(skb);
1480
57be1f3f 1481 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
098dafcf
TE		 1482
1483 nfc_llcp_rx_skb(local, skb);
d646960f 1484
916082b0 1485 schedule_work(&local->tx_work);
d646960f
SO		 1486 kfree_skb(local->rx_pending);
1487 local->rx_pending = NULL;
d646960f
SO		 1488}
1489
1727cf93
SO		 1490static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1491{
1492 local->rx_pending = skb;
1493 del_timer(&local->link_timer);
1494 schedule_work(&local->rx_work);
1495}
1496
d646960f
SO		 1497void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1498{
1499 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1500
1501 pr_debug("Received an LLCP PDU\n");
1502 if (err < 0) {
427a2eb1 1503 pr_err("err %d\n", err);
d646960f
SO		 1504 return;
1505 }
1506
1727cf93 1507 __nfc_llcp_recv(local, skb);
d646960f
SO		 1508}
1509
73167ced
SO		 1510int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1511{
1512 struct nfc_llcp_local *local;
1513
1514 local = nfc_llcp_find_local(dev);
966efbfb
JL		 1515 if (local == NULL) {
1516 kfree_skb(skb);
73167ced 1517 return -ENODEV;
966efbfb 1518 }
73167ced 1519
1727cf93 1520 __nfc_llcp_recv(local, skb);
73167ced
SO		 1521
1522 return 0;
1523}
1524
d646960f
SO		 1525void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1526{
1527 struct nfc_llcp_local *local;
1528
1529 local = nfc_llcp_find_local(dev);
1530 if (local == NULL)
1531 return;
1532
abd18d43
TE		 1533 local->remote_miu = LLCP_DEFAULT_MIU;
1534 local->remote_lto = LLCP_DEFAULT_LTO;
1535
d646960f 1536 /* Close and purge all existing sockets */
3bbc0ceb 1537 nfc_llcp_socket_release(local, true, 0);
d646960f
SO		 1538}
1539
1540void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1541 u8 comm_mode, u8 rf_mode)
1542{
1543 struct nfc_llcp_local *local;
1544
1545 pr_debug("rf mode %d\n", rf_mode);
1546
1547 local = nfc_llcp_find_local(dev);
1548 if (local == NULL)
1549 return;
1550
1551 local->target_idx = target_idx;
1552 local->comm_mode = comm_mode;
1553 local->rf_mode = rf_mode;
1554
1555 if (rf_mode == NFC_RF_INITIATOR) {
1556 pr_debug("Queueing Tx work\n");
1557
916082b0 1558 schedule_work(&local->tx_work);
d646960f
SO		 1559 } else {
1560 mod_timer(&local->link_timer,
427a2eb1 1561 jiffies + msecs_to_jiffies(local->remote_lto));
d646960f
SO		 1562 }
1563}
1564
1565int nfc_llcp_register_device(struct nfc_dev *ndev)
1566{
d646960f 1567 struct nfc_llcp_local *local;
d646960f
SO		 1568
1569 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1570 if (local == NULL)
1571 return -ENOMEM;
1572
1573 local->dev = ndev;
1574 INIT_LIST_HEAD(&local->list);
c7aa1225 1575 kref_init(&local->ref);
d646960f 1576 mutex_init(&local->sdp_lock);
d646960f
SO		 1577 init_timer(&local->link_timer);
1578 local->link_timer.data = (unsigned long) local;
1579 local->link_timer.function = nfc_llcp_symm_timer;
1580
1581 skb_queue_head_init(&local->tx_queue);
1582 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
d646960f
SO		 1583
1584 local->rx_pending = NULL;
1585 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
d646960f
SO		 1586
1587 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
d646960f 1588
fe235b58
SJ		 1589 rwlock_init(&local->sockets.lock);
1590 rwlock_init(&local->connecting_sockets.lock);
4463523b 1591 rwlock_init(&local->raw_sockets.lock);
a69f32af 1592
52feb444
TE		 1593 local->lto = 150; /* 1500 ms */
1594 local->rw = LLCP_MAX_RW;
1595 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
f768b340 1596 local->local_wks = 0x1; /* LLC Link Management */
52feb444 1597
d646960f
SO		 1598 nfc_llcp_build_gb(local);
1599
1600 local->remote_miu = LLCP_DEFAULT_MIU;
1601 local->remote_lto = LLCP_DEFAULT_LTO;
d646960f 1602
d9b8d8e1
TE		 1603 mutex_init(&local->sdreq_lock);
1604 INIT_HLIST_HEAD(&local->pending_sdreqs);
40213fa8
TE		 1605 init_timer(&local->sdreq_timer);
1606 local->sdreq_timer.data = (unsigned long) local;
1607 local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1608 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
d9b8d8e1 1609
16a78e9f 1610 list_add(&local->list, &llcp_devices);
d646960f 1611
d646960f
SO		 1612 return 0;
1613}
1614
1615void nfc_llcp_unregister_device(struct nfc_dev *dev)
1616{
1617 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1618
1619 if (local == NULL) {
1620 pr_debug("No such device\n");
1621 return;
1622 }
1623
c470e319 1624 local_cleanup(local);
3536da06 1625
c7aa1225 1626 nfc_llcp_local_put(local);
d646960f
SO		 1627}
1628
1629int __init nfc_llcp_init(void)
1630{
d646960f
SO		 1631 return nfc_llcp_sock_init();
1632}
1633
1634void nfc_llcp_exit(void)
1635{
1636 nfc_llcp_sock_exit();
1637}
Linux 6.x block layer and io_uring tree(s)