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TOMOYO Linux Cross Reference
Linux/net/nfc/llcp_core.c

Version: ~ [ linux-5.1-rc5 ] ~ [ linux-5.0.7 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.34 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.111 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.168 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.178 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.138 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.65 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /*
  2  * Copyright (C) 2011  Intel Corporation. All rights reserved.
  3  * Copyright (C) 2014 Marvell International Ltd.
  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
 16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
 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 
 26 #include "nfc.h"
 27 #include "llcp.h"
 28 
 29 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
 30 
 31 static LIST_HEAD(llcp_devices);
 32 
 33 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
 34 
 35 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
 36 {
 37         write_lock(&l->lock);
 38         sk_add_node(sk, &l->head);
 39         write_unlock(&l->lock);
 40 }
 41 
 42 void 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 }
 48 
 49 void 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 
 55 static 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);
 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 
 78 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
 79                                     int err)
 80 {
 81         struct sock *sk;
 82         struct hlist_node *tmp;
 83         struct nfc_llcp_sock *llcp_sock;
 84 
 85         skb_queue_purge(&local->tx_queue);
 86 
 87         write_lock(&local->sockets.lock);
 88 
 89         sk_for_each_safe(sk, tmp, &local->sockets.head) {
 90                 llcp_sock = nfc_llcp_sock(sk);
 91 
 92                 bh_lock_sock(sk);
 93 
 94                 nfc_llcp_socket_purge(llcp_sock);
 95 
 96                 if (sk->sk_state == LLCP_CONNECTED)
 97                         nfc_put_device(llcp_sock->dev);
 98 
 99                 if (sk->sk_state == LLCP_LISTEN) {
100                         struct nfc_llcp_sock *lsk, *n;
101                         struct sock *accept_sk;
102 
103                         list_for_each_entry_safe(lsk, n,
104                                                  &llcp_sock->accept_queue,
105                                                  accept_queue) {
106                                 accept_sk = &lsk->sk;
107                                 bh_lock_sock(accept_sk);
108 
109                                 nfc_llcp_accept_unlink(accept_sk);
110 
111                                 if (err)
112                                         accept_sk->sk_err = err;
113                                 accept_sk->sk_state = LLCP_CLOSED;
114                                 accept_sk->sk_state_change(sk);
115 
116                                 bh_unlock_sock(accept_sk);
117                         }
118                 }
119 
120                 if (err)
121                         sk->sk_err = err;
122                 sk->sk_state = LLCP_CLOSED;
123                 sk->sk_state_change(sk);
124 
125                 bh_unlock_sock(sk);
126 
127                 sk_del_node_init(sk);
128         }
129 
130         write_unlock(&local->sockets.lock);
131 
132         /* If we still have a device, we keep the RAW sockets alive */
133         if (device == true)
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 
145                 if (err)
146                         sk->sk_err = err;
147                 sk->sk_state = LLCP_CLOSED;
148                 sk->sk_state_change(sk);
149 
150                 bh_unlock_sock(sk);
151 
152                 sk_del_node_init(sk);
153         }
154 
155         write_unlock(&local->raw_sockets.lock);
156 }
157 
158 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
159 {
160         kref_get(&local->ref);
161 
162         return local;
163 }
164 
165 static void local_cleanup(struct nfc_llcp_local *local)
166 {
167         nfc_llcp_socket_release(local, false, ENXIO);
168         del_timer_sync(&local->link_timer);
169         skb_queue_purge(&local->tx_queue);
170         cancel_work_sync(&local->tx_work);
171         cancel_work_sync(&local->rx_work);
172         cancel_work_sync(&local->timeout_work);
173         kfree_skb(local->rx_pending);
174         del_timer_sync(&local->sdreq_timer);
175         cancel_work_sync(&local->sdreq_timeout_work);
176         nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
177 }
178 
179 static 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);
186         local_cleanup(local);
187         kfree(local);
188 }
189 
190 int nfc_llcp_local_put(struct nfc_llcp_local *local)
191 {
192         if (local == NULL)
193                 return 0;
194 
195         return kref_put(&local->ref, local_release);
196 }
197 
198 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
199                                                u8 ssap, u8 dsap)
200 {
201         struct sock *sk;
202         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
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 
213         sk_for_each(sk, &local->sockets.head) {
214                 tmp_sock = nfc_llcp_sock(sk);
215 
216                 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
217                         llcp_sock = tmp_sock;
218                         break;
219                 }
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 
232 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
233 {
234         sock_put(&sock->sk);
235 }
236 
237 static void nfc_llcp_timeout_work(struct work_struct *work)
238 {
239         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
240                                                     timeout_work);
241 
242         nfc_dep_link_down(local->dev);
243 }
244 
245 static void nfc_llcp_symm_timer(struct timer_list *t)
246 {
247         struct nfc_llcp_local *local = from_timer(local, t, link_timer);
248 
249         pr_err("SYMM timeout\n");
250 
251         schedule_work(&local->timeout_work);
252 }
253 
254 static 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 
288 static void nfc_llcp_sdreq_timer(struct timer_list *t)
289 {
290         struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer);
291 
292         schedule_work(&local->sdreq_timeout_work);
293 }
294 
295 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
296 {
297         struct nfc_llcp_local *local;
298 
299         list_for_each_entry(local, &llcp_devices, list)
300                 if (local->dev == dev)
301                         return local;
302 
303         pr_debug("No device found\n");
304 
305         return NULL;
306 }
307 
308 static char *wks[] = {
309         NULL,
310         NULL, /* SDP */
311         "urn:nfc:sn:ip",
312         "urn:nfc:sn:obex",
313         "urn:nfc:sn:snep",
314 };
315 
316 static 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 
327         for (sap = 0; sap < num_wks; sap++) {
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 
338 static
339 struct 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;
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 
354         sk_for_each(sk, &local->sockets.head) {
355                 tmp_sock = nfc_llcp_sock(sk);
356 
357                 pr_debug("llcp sock %p\n", tmp_sock);
358 
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)
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 
387 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
388                          struct nfc_llcp_sock *sock)
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,
394                                             sock->service_name_len);
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 
406                         set_bit(ssap, &local->local_wks);
407                         mutex_unlock(&local->sdp_lock);
408 
409                         return ssap;
410                 }
411 
412                 /*
413                  * Check if there already is a non WKS socket bound
414                  * to this service name.
415                  */
416                 if (nfc_llcp_sock_from_sn(local, sock->service_name,
417                                           sock->service_name_len) != NULL) {
418                         mutex_unlock(&local->sdp_lock);
419 
420                         return LLCP_SAP_MAX;
421                 }
422 
423                 mutex_unlock(&local->sdp_lock);
424 
425                 return LLCP_SDP_UNBOUND;
426 
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);
431 
432                         return sock->ssap;
433                 }
434         }
435 
436         mutex_unlock(&local->sdp_lock);
437 
438         return LLCP_SAP_MAX;
439 }
440 
441 u8 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 
453         set_bit(local_ssap, &local->local_sap);
454 
455         mutex_unlock(&local->sdp_lock);
456 
457         return local_ssap + LLCP_LOCAL_SAP_OFFSET;
458 }
459 
460 void 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) {
469                 atomic_t *client_cnt;
470 
471                 local_ssap = ssap - LLCP_WKS_NUM_SAP;
472                 sdp = &local->local_sdp;
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;
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 
506         clear_bit(local_ssap, sdp);
507 
508         mutex_unlock(&local->sdp_lock);
509 }
510 
511 static 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 
533 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
534 {
535         u8 *gb_cur, version, version_length;
536         u8 lto_length, wks_length, miux_length;
537         u8 *version_tlv = NULL, *lto_tlv = NULL,
538            *wks_tlv = NULL, *miux_tlv = NULL;
539         __be16 wks = cpu_to_be16(local->local_wks);
540         u8 gb_len = 0;
541         int ret = 0;
542 
543         version = LLCP_VERSION_11;
544         version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
545                                          1, &version_length);
546         if (!version_tlv) {
547                 ret = -ENOMEM;
548                 goto out;
549         }
550         gb_len += version_length;
551 
552         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
553         if (!lto_tlv) {
554                 ret = -ENOMEM;
555                 goto out;
556         }
557         gb_len += lto_length;
558 
559         pr_debug("Local wks 0x%lx\n", local->local_wks);
560         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
561         if (!wks_tlv) {
562                 ret = -ENOMEM;
563                 goto out;
564         }
565         gb_len += wks_length;
566 
567         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
568                                       &miux_length);
569         if (!miux_tlv) {
570                 ret = -ENOMEM;
571                 goto out;
572         }
573         gb_len += miux_length;
574 
575         gb_len += ARRAY_SIZE(llcp_magic);
576 
577         if (gb_len > NFC_MAX_GT_LEN) {
578                 ret = -EINVAL;
579                 goto out;
580         }
581 
582         gb_cur = local->gb;
583 
584         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
585         gb_cur += ARRAY_SIZE(llcp_magic);
586 
587         memcpy(gb_cur, version_tlv, version_length);
588         gb_cur += version_length;
589 
590         memcpy(gb_cur, lto_tlv, lto_length);
591         gb_cur += lto_length;
592 
593         memcpy(gb_cur, wks_tlv, wks_length);
594         gb_cur += wks_length;
595 
596         memcpy(gb_cur, miux_tlv, miux_length);
597         gb_cur += miux_length;
598 
599         local->gb_len = gb_len;
600 
601 out:
602         kfree(version_tlv);
603         kfree(lto_tlv);
604         kfree(wks_tlv);
605         kfree(miux_tlv);
606 
607         return ret;
608 }
609 
610 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
611 {
612         struct nfc_llcp_local *local;
613 
614         local = nfc_llcp_find_local(dev);
615         if (local == NULL) {
616                 *general_bytes_len = 0;
617                 return NULL;
618         }
619 
620         nfc_llcp_build_gb(local);
621 
622         *general_bytes_len = local->gb_len;
623 
624         return local->gb;
625 }
626 
627 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
628 {
629         struct nfc_llcp_local *local;
630 
631         if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
632                 return -EINVAL;
633 
634         local = nfc_llcp_find_local(dev);
635         if (local == NULL) {
636                 pr_err("No LLCP device\n");
637                 return -ENODEV;
638         }
639 
640         memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
641         memcpy(local->remote_gb, gb, gb_len);
642         local->remote_gb_len = gb_len;
643 
644         if (memcmp(local->remote_gb, llcp_magic, 3)) {
645                 pr_err("MAC does not support LLCP\n");
646                 return -EINVAL;
647         }
648 
649         return nfc_llcp_parse_gb_tlv(local,
650                                      &local->remote_gb[3],
651                                      local->remote_gb_len - 3);
652 }
653 
654 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
655 {
656         return (pdu->data[0] & 0xfc) >> 2;
657 }
658 
659 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
660 {
661         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
662 }
663 
664 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
665 {
666         return pdu->data[1] & 0x3f;
667 }
668 
669 static u8 nfc_llcp_ns(struct sk_buff *pdu)
670 {
671         return pdu->data[2] >> 4;
672 }
673 
674 static u8 nfc_llcp_nr(struct sk_buff *pdu)
675 {
676         return pdu->data[2] & 0xf;
677 }
678 
679 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
680 {
681         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
682         sock->send_n = (sock->send_n + 1) % 16;
683         sock->recv_ack_n = (sock->recv_n - 1) % 16;
684 }
685 
686 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
687                                struct sk_buff *skb, u8 direction)
688 {
689         struct sk_buff *skb_copy = NULL, *nskb;
690         struct sock *sk;
691         u8 *data;
692 
693         read_lock(&local->raw_sockets.lock);
694 
695         sk_for_each(sk, &local->raw_sockets.head) {
696                 if (sk->sk_state != LLCP_BOUND)
697                         continue;
698 
699                 if (skb_copy == NULL) {
700                         skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
701                                                       GFP_ATOMIC, true);
702 
703                         if (skb_copy == NULL)
704                                 continue;
705 
706                         data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
707 
708                         data[0] = local->dev ? local->dev->idx : 0xFF;
709                         data[1] = direction & 0x01;
710                         data[1] |= (RAW_PAYLOAD_LLCP << 1);
711                 }
712 
713                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
714                 if (!nskb)
715                         continue;
716 
717                 if (sock_queue_rcv_skb(sk, nskb))
718                         kfree_skb(nskb);
719         }
720 
721         read_unlock(&local->raw_sockets.lock);
722 
723         kfree_skb(skb_copy);
724 }
725 
726 static void nfc_llcp_tx_work(struct work_struct *work)
727 {
728         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
729                                                     tx_work);
730         struct sk_buff *skb;
731         struct sock *sk;
732         struct nfc_llcp_sock *llcp_sock;
733 
734         skb = skb_dequeue(&local->tx_queue);
735         if (skb != NULL) {
736                 sk = skb->sk;
737                 llcp_sock = nfc_llcp_sock(sk);
738 
739                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
740                         kfree_skb(skb);
741                         nfc_llcp_send_symm(local->dev);
742                 } else if (llcp_sock && !llcp_sock->remote_ready) {
743                         skb_queue_head(&local->tx_queue, skb);
744                         nfc_llcp_send_symm(local->dev);
745                 } else {
746                         struct sk_buff *copy_skb = NULL;
747                         u8 ptype = nfc_llcp_ptype(skb);
748                         int ret;
749 
750                         pr_debug("Sending pending skb\n");
751                         print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
752                                              16, 1, skb->data, skb->len, true);
753 
754                         if (ptype == LLCP_PDU_DISC && sk != NULL &&
755                             sk->sk_state == LLCP_DISCONNECTING) {
756                                 nfc_llcp_sock_unlink(&local->sockets, sk);
757                                 sock_orphan(sk);
758                                 sock_put(sk);
759                         }
760 
761                         if (ptype == LLCP_PDU_I)
762                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
763 
764                         __net_timestamp(skb);
765 
766                         nfc_llcp_send_to_raw_sock(local, skb,
767                                                   NFC_DIRECTION_TX);
768 
769                         ret = nfc_data_exchange(local->dev, local->target_idx,
770                                                 skb, nfc_llcp_recv, local);
771 
772                         if (ret) {
773                                 kfree_skb(copy_skb);
774                                 goto out;
775                         }
776 
777                         if (ptype == LLCP_PDU_I && copy_skb)
778                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
779                                                copy_skb);
780                 }
781         } else {
782                 nfc_llcp_send_symm(local->dev);
783         }
784 
785 out:
786         mod_timer(&local->link_timer,
787                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
788 }
789 
790 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
791                                                           u8 ssap)
792 {
793         struct sock *sk;
794         struct nfc_llcp_sock *llcp_sock;
795 
796         read_lock(&local->connecting_sockets.lock);
797 
798         sk_for_each(sk, &local->connecting_sockets.head) {
799                 llcp_sock = nfc_llcp_sock(sk);
800 
801                 if (llcp_sock->ssap == ssap) {
802                         sock_hold(&llcp_sock->sk);
803                         goto out;
804                 }
805         }
806 
807         llcp_sock = NULL;
808 
809 out:
810         read_unlock(&local->connecting_sockets.lock);
811 
812         return llcp_sock;
813 }
814 
815 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
816                                                   u8 *sn, size_t sn_len)
817 {
818         struct nfc_llcp_sock *llcp_sock;
819 
820         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
821 
822         if (llcp_sock == NULL)
823                 return NULL;
824 
825         sock_hold(&llcp_sock->sk);
826 
827         return llcp_sock;
828 }
829 
830 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
831 {
832         u8 *tlv = &skb->data[2], type, length;
833         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
834 
835         while (offset < tlv_array_len) {
836                 type = tlv[0];
837                 length = tlv[1];
838 
839                 pr_debug("type 0x%x length %d\n", type, length);
840 
841                 if (type == LLCP_TLV_SN) {
842                         *sn_len = length;
843                         return &tlv[2];
844                 }
845 
846                 offset += length + 2;
847                 tlv += length + 2;
848         }
849 
850         return NULL;
851 }
852 
853 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
854                              struct sk_buff *skb)
855 {
856         struct nfc_llcp_sock *llcp_sock;
857         struct nfc_llcp_ui_cb *ui_cb;
858         u8 dsap, ssap;
859 
860         dsap = nfc_llcp_dsap(skb);
861         ssap = nfc_llcp_ssap(skb);
862 
863         ui_cb = nfc_llcp_ui_skb_cb(skb);
864         ui_cb->dsap = dsap;
865         ui_cb->ssap = ssap;
866 
867         pr_debug("%d %d\n", dsap, ssap);
868 
869         /* We're looking for a bound socket, not a client one */
870         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
871         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
872                 return;
873 
874         /* There is no sequence with UI frames */
875         skb_pull(skb, LLCP_HEADER_SIZE);
876         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
877                 /*
878                  * UI frames will be freed from the socket layer, so we
879                  * need to keep them alive until someone receives them.
880                  */
881                 skb_get(skb);
882         } else {
883                 pr_err("Receive queue is full\n");
884         }
885 
886         nfc_llcp_sock_put(llcp_sock);
887 }
888 
889 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
890                                   struct sk_buff *skb)
891 {
892         struct sock *new_sk, *parent;
893         struct nfc_llcp_sock *sock, *new_sock;
894         u8 dsap, ssap, reason;
895 
896         dsap = nfc_llcp_dsap(skb);
897         ssap = nfc_llcp_ssap(skb);
898 
899         pr_debug("%d %d\n", dsap, ssap);
900 
901         if (dsap != LLCP_SAP_SDP) {
902                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
903                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
904                         reason = LLCP_DM_NOBOUND;
905                         goto fail;
906                 }
907         } else {
908                 u8 *sn;
909                 size_t sn_len;
910 
911                 sn = nfc_llcp_connect_sn(skb, &sn_len);
912                 if (sn == NULL) {
913                         reason = LLCP_DM_NOBOUND;
914                         goto fail;
915                 }
916 
917                 pr_debug("Service name length %zu\n", sn_len);
918 
919                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
920                 if (sock == NULL) {
921                         reason = LLCP_DM_NOBOUND;
922                         goto fail;
923                 }
924         }
925 
926         lock_sock(&sock->sk);
927 
928         parent = &sock->sk;
929 
930         if (sk_acceptq_is_full(parent)) {
931                 reason = LLCP_DM_REJ;
932                 release_sock(&sock->sk);
933                 sock_put(&sock->sk);
934                 goto fail;
935         }
936 
937         if (sock->ssap == LLCP_SDP_UNBOUND) {
938                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
939 
940                 pr_debug("First client, reserving %d\n", ssap);
941 
942                 if (ssap == LLCP_SAP_MAX) {
943                         reason = LLCP_DM_REJ;
944                         release_sock(&sock->sk);
945                         sock_put(&sock->sk);
946                         goto fail;
947                 }
948 
949                 sock->ssap = ssap;
950         }
951 
952         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
953         if (new_sk == NULL) {
954                 reason = LLCP_DM_REJ;
955                 release_sock(&sock->sk);
956                 sock_put(&sock->sk);
957                 goto fail;
958         }
959 
960         new_sock = nfc_llcp_sock(new_sk);
961         new_sock->dev = local->dev;
962         new_sock->local = nfc_llcp_local_get(local);
963         new_sock->rw = sock->rw;
964         new_sock->miux = sock->miux;
965         new_sock->nfc_protocol = sock->nfc_protocol;
966         new_sock->dsap = ssap;
967         new_sock->target_idx = local->target_idx;
968         new_sock->parent = parent;
969         new_sock->ssap = sock->ssap;
970         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
971                 atomic_t *client_count;
972 
973                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
974 
975                 client_count =
976                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
977 
978                 atomic_inc(client_count);
979                 new_sock->reserved_ssap = sock->ssap;
980         }
981 
982         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
983                                       skb->len - LLCP_HEADER_SIZE);
984 
985         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
986 
987         nfc_llcp_sock_link(&local->sockets, new_sk);
988 
989         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
990 
991         nfc_get_device(local->dev->idx);
992 
993         new_sk->sk_state = LLCP_CONNECTED;
994 
995         /* Wake the listening processes */
996         parent->sk_data_ready(parent);
997 
998         /* Send CC */
999         nfc_llcp_send_cc(new_sock);
1000 
1001         release_sock(&sock->sk);
1002         sock_put(&sock->sk);
1003 
1004         return;
1005 
1006 fail:
1007         /* Send DM */
1008         nfc_llcp_send_dm(local, dsap, ssap, reason);
1009 }
1010 
1011 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
1012 {
1013         int nr_frames = 0;
1014         struct nfc_llcp_local *local = sock->local;
1015 
1016         pr_debug("Remote ready %d tx queue len %d remote rw %d",
1017                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1018                  sock->remote_rw);
1019 
1020         /* Try to queue some I frames for transmission */
1021         while (sock->remote_ready &&
1022                skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1023                 struct sk_buff *pdu;
1024 
1025                 pdu = skb_dequeue(&sock->tx_queue);
1026                 if (pdu == NULL)
1027                         break;
1028 
1029                 /* Update N(S)/N(R) */
1030                 nfc_llcp_set_nrns(sock, pdu);
1031 
1032                 skb_queue_tail(&local->tx_queue, pdu);
1033                 nr_frames++;
1034         }
1035 
1036         return nr_frames;
1037 }
1038 
1039 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1040                                struct sk_buff *skb)
1041 {
1042         struct nfc_llcp_sock *llcp_sock;
1043         struct sock *sk;
1044         u8 dsap, ssap, ptype, ns, nr;
1045 
1046         ptype = nfc_llcp_ptype(skb);
1047         dsap = nfc_llcp_dsap(skb);
1048         ssap = nfc_llcp_ssap(skb);
1049         ns = nfc_llcp_ns(skb);
1050         nr = nfc_llcp_nr(skb);
1051 
1052         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1053 
1054         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1055         if (llcp_sock == NULL) {
1056                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1057                 return;
1058         }
1059 
1060         sk = &llcp_sock->sk;
1061         lock_sock(sk);
1062         if (sk->sk_state == LLCP_CLOSED) {
1063                 release_sock(sk);
1064                 nfc_llcp_sock_put(llcp_sock);
1065         }
1066 
1067         /* Pass the payload upstream */
1068         if (ptype == LLCP_PDU_I) {
1069                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1070 
1071                 if (ns == llcp_sock->recv_n)
1072                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1073                 else
1074                         pr_err("Received out of sequence I PDU\n");
1075 
1076                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1077                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1078                         /*
1079                          * I frames will be freed from the socket layer, so we
1080                          * need to keep them alive until someone receives them.
1081                          */
1082                         skb_get(skb);
1083                 } else {
1084                         pr_err("Receive queue is full\n");
1085                 }
1086         }
1087 
1088         /* Remove skbs from the pending queue */
1089         if (llcp_sock->send_ack_n != nr) {
1090                 struct sk_buff *s, *tmp;
1091                 u8 n;
1092 
1093                 llcp_sock->send_ack_n = nr;
1094 
1095                 /* Remove and free all skbs until ns == nr */
1096                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1097                         n = nfc_llcp_ns(s);
1098 
1099                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1100                         kfree_skb(s);
1101 
1102                         if (n == nr)
1103                                 break;
1104                 }
1105 
1106                 /* Re-queue the remaining skbs for transmission */
1107                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1108                                             s, tmp) {
1109                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1110                         skb_queue_head(&local->tx_queue, s);
1111                 }
1112         }
1113 
1114         if (ptype == LLCP_PDU_RR)
1115                 llcp_sock->remote_ready = true;
1116         else if (ptype == LLCP_PDU_RNR)
1117                 llcp_sock->remote_ready = false;
1118 
1119         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1120                 nfc_llcp_send_rr(llcp_sock);
1121 
1122         release_sock(sk);
1123         nfc_llcp_sock_put(llcp_sock);
1124 }
1125 
1126 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1127                                struct sk_buff *skb)
1128 {
1129         struct nfc_llcp_sock *llcp_sock;
1130         struct sock *sk;
1131         u8 dsap, ssap;
1132 
1133         dsap = nfc_llcp_dsap(skb);
1134         ssap = nfc_llcp_ssap(skb);
1135 
1136         if ((dsap == 0) && (ssap == 0)) {
1137                 pr_debug("Connection termination");
1138                 nfc_dep_link_down(local->dev);
1139                 return;
1140         }
1141 
1142         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1143         if (llcp_sock == NULL) {
1144                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1145                 return;
1146         }
1147 
1148         sk = &llcp_sock->sk;
1149         lock_sock(sk);
1150 
1151         nfc_llcp_socket_purge(llcp_sock);
1152 
1153         if (sk->sk_state == LLCP_CLOSED) {
1154                 release_sock(sk);
1155                 nfc_llcp_sock_put(llcp_sock);
1156         }
1157 
1158         if (sk->sk_state == LLCP_CONNECTED) {
1159                 nfc_put_device(local->dev);
1160                 sk->sk_state = LLCP_CLOSED;
1161                 sk->sk_state_change(sk);
1162         }
1163 
1164         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1165 
1166         release_sock(sk);
1167         nfc_llcp_sock_put(llcp_sock);
1168 }
1169 
1170 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1171 {
1172         struct nfc_llcp_sock *llcp_sock;
1173         struct sock *sk;
1174         u8 dsap, ssap;
1175 
1176         dsap = nfc_llcp_dsap(skb);
1177         ssap = nfc_llcp_ssap(skb);
1178 
1179         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1180         if (llcp_sock == NULL) {
1181                 pr_err("Invalid CC\n");
1182                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1183 
1184                 return;
1185         }
1186 
1187         sk = &llcp_sock->sk;
1188 
1189         /* Unlink from connecting and link to the client array */
1190         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1191         nfc_llcp_sock_link(&local->sockets, sk);
1192         llcp_sock->dsap = ssap;
1193 
1194         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1195                                       skb->len - LLCP_HEADER_SIZE);
1196 
1197         sk->sk_state = LLCP_CONNECTED;
1198         sk->sk_state_change(sk);
1199 
1200         nfc_llcp_sock_put(llcp_sock);
1201 }
1202 
1203 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1204 {
1205         struct nfc_llcp_sock *llcp_sock;
1206         struct sock *sk;
1207         u8 dsap, ssap, reason;
1208 
1209         dsap = nfc_llcp_dsap(skb);
1210         ssap = nfc_llcp_ssap(skb);
1211         reason = skb->data[2];
1212 
1213         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1214 
1215         switch (reason) {
1216         case LLCP_DM_NOBOUND:
1217         case LLCP_DM_REJ:
1218                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1219                 break;
1220 
1221         default:
1222                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1223                 break;
1224         }
1225 
1226         if (llcp_sock == NULL) {
1227                 pr_debug("Already closed\n");
1228                 return;
1229         }
1230 
1231         sk = &llcp_sock->sk;
1232 
1233         sk->sk_err = ENXIO;
1234         sk->sk_state = LLCP_CLOSED;
1235         sk->sk_state_change(sk);
1236 
1237         nfc_llcp_sock_put(llcp_sock);
1238 }
1239 
1240 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1241                               struct sk_buff *skb)
1242 {
1243         struct nfc_llcp_sock *llcp_sock;
1244         u8 dsap, ssap, *tlv, type, length, tid, sap;
1245         u16 tlv_len, offset;
1246         char *service_name;
1247         size_t service_name_len;
1248         struct nfc_llcp_sdp_tlv *sdp;
1249         HLIST_HEAD(llc_sdres_list);
1250         size_t sdres_tlvs_len;
1251         HLIST_HEAD(nl_sdres_list);
1252 
1253         dsap = nfc_llcp_dsap(skb);
1254         ssap = nfc_llcp_ssap(skb);
1255 
1256         pr_debug("%d %d\n", dsap, ssap);
1257 
1258         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1259                 pr_err("Wrong SNL SAP\n");
1260                 return;
1261         }
1262 
1263         tlv = &skb->data[LLCP_HEADER_SIZE];
1264         tlv_len = skb->len - LLCP_HEADER_SIZE;
1265         offset = 0;
1266         sdres_tlvs_len = 0;
1267 
1268         while (offset < tlv_len) {
1269                 type = tlv[0];
1270                 length = tlv[1];
1271 
1272                 switch (type) {
1273                 case LLCP_TLV_SDREQ:
1274                         tid = tlv[2];
1275                         service_name = (char *) &tlv[3];
1276                         service_name_len = length - 1;
1277 
1278                         pr_debug("Looking for %.16s\n", service_name);
1279 
1280                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1281                             !strncmp(service_name, "urn:nfc:sn:sdp",
1282                                      service_name_len)) {
1283                                 sap = 1;
1284                                 goto add_snl;
1285                         }
1286 
1287                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1288                                                           service_name_len);
1289                         if (!llcp_sock) {
1290                                 sap = 0;
1291                                 goto add_snl;
1292                         }
1293 
1294                         /*
1295                          * We found a socket but its ssap has not been reserved
1296                          * yet. We need to assign it for good and send a reply.
1297                          * The ssap will be freed when the socket is closed.
1298                          */
1299                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1300                                 atomic_t *client_count;
1301 
1302                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1303 
1304                                 pr_debug("Reserving %d\n", sap);
1305 
1306                                 if (sap == LLCP_SAP_MAX) {
1307                                         sap = 0;
1308                                         goto add_snl;
1309                                 }
1310 
1311                                 client_count =
1312                                         &local->local_sdp_cnt[sap -
1313                                                               LLCP_WKS_NUM_SAP];
1314 
1315                                 atomic_inc(client_count);
1316 
1317                                 llcp_sock->ssap = sap;
1318                                 llcp_sock->reserved_ssap = sap;
1319                         } else {
1320                                 sap = llcp_sock->ssap;
1321                         }
1322 
1323                         pr_debug("%p %d\n", llcp_sock, sap);
1324 
1325 add_snl:
1326                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1327                         if (sdp == NULL)
1328                                 goto exit;
1329 
1330                         sdres_tlvs_len += sdp->tlv_len;
1331                         hlist_add_head(&sdp->node, &llc_sdres_list);
1332                         break;
1333 
1334                 case LLCP_TLV_SDRES:
1335                         mutex_lock(&local->sdreq_lock);
1336 
1337                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1338 
1339                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1340                                 if (sdp->tid != tlv[2])
1341                                         continue;
1342 
1343                                 sdp->sap = tlv[3];
1344 
1345                                 pr_debug("Found: uri=%s, sap=%d\n",
1346                                          sdp->uri, sdp->sap);
1347 
1348                                 hlist_del(&sdp->node);
1349 
1350                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1351 
1352                                 break;
1353                         }
1354 
1355                         mutex_unlock(&local->sdreq_lock);
1356                         break;
1357 
1358                 default:
1359                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1360                         break;
1361                 }
1362 
1363                 offset += length + 2;
1364                 tlv += length + 2;
1365         }
1366 
1367 exit:
1368         if (!hlist_empty(&nl_sdres_list))
1369                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1370 
1371         if (!hlist_empty(&llc_sdres_list))
1372                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1373 }
1374 
1375 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1376 {
1377         u8 ptype;
1378         u16 pdu_len;
1379         struct sk_buff *new_skb;
1380 
1381         if (skb->len <= LLCP_HEADER_SIZE) {
1382                 pr_err("Malformed AGF PDU\n");
1383                 return;
1384         }
1385 
1386         skb_pull(skb, LLCP_HEADER_SIZE);
1387 
1388         while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1389                 pdu_len = skb->data[0] << 8 | skb->data[1];
1390 
1391                 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1392 
1393                 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1394                         pr_err("Malformed AGF PDU\n");
1395                         return;
1396                 }
1397 
1398                 ptype = nfc_llcp_ptype(skb);
1399 
1400                 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1401                         goto next;
1402 
1403                 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1404                 if (new_skb == NULL) {
1405                         pr_err("Could not allocate PDU\n");
1406                         return;
1407                 }
1408 
1409                 skb_put_data(new_skb, skb->data, pdu_len);
1410 
1411                 nfc_llcp_rx_skb(local, new_skb);
1412 
1413                 kfree_skb(new_skb);
1414 next:
1415                 skb_pull(skb, pdu_len);
1416         }
1417 }
1418 
1419 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1420 {
1421         u8 dsap, ssap, ptype;
1422 
1423         ptype = nfc_llcp_ptype(skb);
1424         dsap = nfc_llcp_dsap(skb);
1425         ssap = nfc_llcp_ssap(skb);
1426 
1427         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1428 
1429         if (ptype != LLCP_PDU_SYMM)
1430                 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1431                                      skb->data, skb->len, true);
1432 
1433         switch (ptype) {
1434         case LLCP_PDU_SYMM:
1435                 pr_debug("SYMM\n");
1436                 break;
1437 
1438         case LLCP_PDU_UI:
1439                 pr_debug("UI\n");
1440                 nfc_llcp_recv_ui(local, skb);
1441                 break;
1442 
1443         case LLCP_PDU_CONNECT:
1444                 pr_debug("CONNECT\n");
1445                 nfc_llcp_recv_connect(local, skb);
1446                 break;
1447 
1448         case LLCP_PDU_DISC:
1449                 pr_debug("DISC\n");
1450                 nfc_llcp_recv_disc(local, skb);
1451                 break;
1452 
1453         case LLCP_PDU_CC:
1454                 pr_debug("CC\n");
1455                 nfc_llcp_recv_cc(local, skb);
1456                 break;
1457 
1458         case LLCP_PDU_DM:
1459                 pr_debug("DM\n");
1460                 nfc_llcp_recv_dm(local, skb);
1461                 break;
1462 
1463         case LLCP_PDU_SNL:
1464                 pr_debug("SNL\n");
1465                 nfc_llcp_recv_snl(local, skb);
1466                 break;
1467 
1468         case LLCP_PDU_I:
1469         case LLCP_PDU_RR:
1470         case LLCP_PDU_RNR:
1471                 pr_debug("I frame\n");
1472                 nfc_llcp_recv_hdlc(local, skb);
1473                 break;
1474 
1475         case LLCP_PDU_AGF:
1476                 pr_debug("AGF frame\n");
1477                 nfc_llcp_recv_agf(local, skb);
1478                 break;
1479         }
1480 }
1481 
1482 static void nfc_llcp_rx_work(struct work_struct *work)
1483 {
1484         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1485                                                     rx_work);
1486         struct sk_buff *skb;
1487 
1488         skb = local->rx_pending;
1489         if (skb == NULL) {
1490                 pr_debug("No pending SKB\n");
1491                 return;
1492         }
1493 
1494         __net_timestamp(skb);
1495 
1496         nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1497 
1498         nfc_llcp_rx_skb(local, skb);
1499 
1500         schedule_work(&local->tx_work);
1501         kfree_skb(local->rx_pending);
1502         local->rx_pending = NULL;
1503 }
1504 
1505 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1506 {
1507         local->rx_pending = skb;
1508         del_timer(&local->link_timer);
1509         schedule_work(&local->rx_work);
1510 }
1511 
1512 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1513 {
1514         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1515 
1516         pr_debug("Received an LLCP PDU\n");
1517         if (err < 0) {
1518                 pr_err("err %d\n", err);
1519                 return;
1520         }
1521 
1522         __nfc_llcp_recv(local, skb);
1523 }
1524 
1525 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1526 {
1527         struct nfc_llcp_local *local;
1528 
1529         local = nfc_llcp_find_local(dev);
1530         if (local == NULL) {
1531                 kfree_skb(skb);
1532                 return -ENODEV;
1533         }
1534 
1535         __nfc_llcp_recv(local, skb);
1536 
1537         return 0;
1538 }
1539 
1540 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1541 {
1542         struct nfc_llcp_local *local;
1543 
1544         local = nfc_llcp_find_local(dev);
1545         if (local == NULL)
1546                 return;
1547 
1548         local->remote_miu = LLCP_DEFAULT_MIU;
1549         local->remote_lto = LLCP_DEFAULT_LTO;
1550 
1551         /* Close and purge all existing sockets */
1552         nfc_llcp_socket_release(local, true, 0);
1553 }
1554 
1555 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1556                         u8 comm_mode, u8 rf_mode)
1557 {
1558         struct nfc_llcp_local *local;
1559 
1560         pr_debug("rf mode %d\n", rf_mode);
1561 
1562         local = nfc_llcp_find_local(dev);
1563         if (local == NULL)
1564                 return;
1565 
1566         local->target_idx = target_idx;
1567         local->comm_mode = comm_mode;
1568         local->rf_mode = rf_mode;
1569 
1570         if (rf_mode == NFC_RF_INITIATOR) {
1571                 pr_debug("Queueing Tx work\n");
1572 
1573                 schedule_work(&local->tx_work);
1574         } else {
1575                 mod_timer(&local->link_timer,
1576                           jiffies + msecs_to_jiffies(local->remote_lto));
1577         }
1578 }
1579 
1580 int nfc_llcp_register_device(struct nfc_dev *ndev)
1581 {
1582         struct nfc_llcp_local *local;
1583 
1584         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1585         if (local == NULL)
1586                 return -ENOMEM;
1587 
1588         local->dev = ndev;
1589         INIT_LIST_HEAD(&local->list);
1590         kref_init(&local->ref);
1591         mutex_init(&local->sdp_lock);
1592         timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0);
1593 
1594         skb_queue_head_init(&local->tx_queue);
1595         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1596 
1597         local->rx_pending = NULL;
1598         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1599 
1600         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1601 
1602         rwlock_init(&local->sockets.lock);
1603         rwlock_init(&local->connecting_sockets.lock);
1604         rwlock_init(&local->raw_sockets.lock);
1605 
1606         local->lto = 150; /* 1500 ms */
1607         local->rw = LLCP_MAX_RW;
1608         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1609         local->local_wks = 0x1; /* LLC Link Management */
1610 
1611         nfc_llcp_build_gb(local);
1612 
1613         local->remote_miu = LLCP_DEFAULT_MIU;
1614         local->remote_lto = LLCP_DEFAULT_LTO;
1615 
1616         mutex_init(&local->sdreq_lock);
1617         INIT_HLIST_HEAD(&local->pending_sdreqs);
1618         timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
1619         INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1620 
1621         list_add(&local->list, &llcp_devices);
1622 
1623         return 0;
1624 }
1625 
1626 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1627 {
1628         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1629 
1630         if (local == NULL) {
1631                 pr_debug("No such device\n");
1632                 return;
1633         }
1634 
1635         local_cleanup(local);
1636 
1637         nfc_llcp_local_put(local);
1638 }
1639 
1640 int __init nfc_llcp_init(void)
1641 {
1642         return nfc_llcp_sock_init();
1643 }
1644 
1645 void nfc_llcp_exit(void)
1646 {
1647         nfc_llcp_sock_exit();
1648 }
1649 

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