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Linux/net/nfc/llcp_core.c

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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_tlv, version, version_length;
536         u8 *lto_tlv, lto_length;
537         u8 *wks_tlv, wks_length;
538         u8 *miux_tlv, miux_length;
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         gb_len += version_length;
547 
548         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
549         gb_len += lto_length;
550 
551         pr_debug("Local wks 0x%lx\n", local->local_wks);
552         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
553         gb_len += wks_length;
554 
555         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
556                                       &miux_length);
557         gb_len += miux_length;
558 
559         gb_len += ARRAY_SIZE(llcp_magic);
560 
561         if (gb_len > NFC_MAX_GT_LEN) {
562                 ret = -EINVAL;
563                 goto out;
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 
580         memcpy(gb_cur, miux_tlv, miux_length);
581         gb_cur += miux_length;
582 
583         local->gb_len = gb_len;
584 
585 out:
586         kfree(version_tlv);
587         kfree(lto_tlv);
588         kfree(wks_tlv);
589         kfree(miux_tlv);
590 
591         return ret;
592 }
593 
594 u8 *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 
611 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
612 {
613         struct nfc_llcp_local *local;
614 
615         if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
616                 return -EINVAL;
617 
618         local = nfc_llcp_find_local(dev);
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 
628         if (memcmp(local->remote_gb, llcp_magic, 3)) {
629                 pr_err("MAC does not support LLCP\n");
630                 return -EINVAL;
631         }
632 
633         return nfc_llcp_parse_gb_tlv(local,
634                                      &local->remote_gb[3],
635                                      local->remote_gb_len - 3);
636 }
637 
638 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
639 {
640         return (pdu->data[0] & 0xfc) >> 2;
641 }
642 
643 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
644 {
645         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
646 }
647 
648 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
649 {
650         return pdu->data[1] & 0x3f;
651 }
652 
653 static u8 nfc_llcp_ns(struct sk_buff *pdu)
654 {
655         return pdu->data[2] >> 4;
656 }
657 
658 static u8 nfc_llcp_nr(struct sk_buff *pdu)
659 {
660         return pdu->data[2] & 0xf;
661 }
662 
663 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
664 {
665         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
666         sock->send_n = (sock->send_n + 1) % 16;
667         sock->recv_ack_n = (sock->recv_n - 1) % 16;
668 }
669 
670 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
671                                struct sk_buff *skb, u8 direction)
672 {
673         struct sk_buff *skb_copy = NULL, *nskb;
674         struct sock *sk;
675         u8 *data;
676 
677         read_lock(&local->raw_sockets.lock);
678 
679         sk_for_each(sk, &local->raw_sockets.head) {
680                 if (sk->sk_state != LLCP_BOUND)
681                         continue;
682 
683                 if (skb_copy == NULL) {
684                         skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
685                                                       GFP_ATOMIC, true);
686 
687                         if (skb_copy == NULL)
688                                 continue;
689 
690                         data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
691 
692                         data[0] = local->dev ? local->dev->idx : 0xFF;
693                         data[1] = direction & 0x01;
694                         data[1] |= (RAW_PAYLOAD_LLCP << 1);
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 
710 static 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);
722 
723                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
724                         kfree_skb(skb);
725                         nfc_llcp_send_symm(local->dev);
726                 } else if (llcp_sock && !llcp_sock->remote_ready) {
727                         skb_queue_head(&local->tx_queue, skb);
728                         nfc_llcp_send_symm(local->dev);
729                 } else {
730                         struct sk_buff *copy_skb = NULL;
731                         u8 ptype = nfc_llcp_ptype(skb);
732                         int ret;
733 
734                         pr_debug("Sending pending skb\n");
735                         print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
736                                              16, 1, skb->data, skb->len, true);
737 
738                         if (ptype == LLCP_PDU_DISC && sk != NULL &&
739                             sk->sk_state == LLCP_DISCONNECTING) {
740                                 nfc_llcp_sock_unlink(&local->sockets, sk);
741                                 sock_orphan(sk);
742                                 sock_put(sk);
743                         }
744 
745                         if (ptype == LLCP_PDU_I)
746                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
747 
748                         __net_timestamp(skb);
749 
750                         nfc_llcp_send_to_raw_sock(local, skb,
751                                                   NFC_DIRECTION_TX);
752 
753                         ret = nfc_data_exchange(local->dev, local->target_idx,
754                                                 skb, nfc_llcp_recv, local);
755 
756                         if (ret) {
757                                 kfree_skb(copy_skb);
758                                 goto out;
759                         }
760 
761                         if (ptype == LLCP_PDU_I && copy_skb)
762                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
763                                                copy_skb);
764                 }
765         } else {
766                 nfc_llcp_send_symm(local->dev);
767         }
768 
769 out:
770         mod_timer(&local->link_timer,
771                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
772 }
773 
774 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
775                                                           u8 ssap)
776 {
777         struct sock *sk;
778         struct nfc_llcp_sock *llcp_sock;
779 
780         read_lock(&local->connecting_sockets.lock);
781 
782         sk_for_each(sk, &local->connecting_sockets.head) {
783                 llcp_sock = nfc_llcp_sock(sk);
784 
785                 if (llcp_sock->ssap == ssap) {
786                         sock_hold(&llcp_sock->sk);
787                         goto out;
788                 }
789         }
790 
791         llcp_sock = NULL;
792 
793 out:
794         read_unlock(&local->connecting_sockets.lock);
795 
796         return llcp_sock;
797 }
798 
799 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
800                                                   u8 *sn, size_t sn_len)
801 {
802         struct nfc_llcp_sock *llcp_sock;
803 
804         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
805 
806         if (llcp_sock == NULL)
807                 return NULL;
808 
809         sock_hold(&llcp_sock->sk);
810 
811         return llcp_sock;
812 }
813 
814 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
815 {
816         u8 *tlv = &skb->data[2], type, length;
817         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
818 
819         while (offset < tlv_array_len) {
820                 type = tlv[0];
821                 length = tlv[1];
822 
823                 pr_debug("type 0x%x length %d\n", type, length);
824 
825                 if (type == LLCP_TLV_SN) {
826                         *sn_len = length;
827                         return &tlv[2];
828                 }
829 
830                 offset += length + 2;
831                 tlv += length + 2;
832         }
833 
834         return NULL;
835 }
836 
837 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
838                              struct sk_buff *skb)
839 {
840         struct nfc_llcp_sock *llcp_sock;
841         struct nfc_llcp_ui_cb *ui_cb;
842         u8 dsap, ssap;
843 
844         dsap = nfc_llcp_dsap(skb);
845         ssap = nfc_llcp_ssap(skb);
846 
847         ui_cb = nfc_llcp_ui_skb_cb(skb);
848         ui_cb->dsap = dsap;
849         ui_cb->ssap = ssap;
850 
851         pr_debug("%d %d\n", dsap, ssap);
852 
853         /* We're looking for a bound socket, not a client one */
854         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
855         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
856                 return;
857 
858         /* There is no sequence with UI frames */
859         skb_pull(skb, LLCP_HEADER_SIZE);
860         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
861                 /*
862                  * UI frames will be freed from the socket layer, so we
863                  * need to keep them alive until someone receives them.
864                  */
865                 skb_get(skb);
866         } else {
867                 pr_err("Receive queue is full\n");
868         }
869 
870         nfc_llcp_sock_put(llcp_sock);
871 }
872 
873 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
874                                   struct sk_buff *skb)
875 {
876         struct sock *new_sk, *parent;
877         struct nfc_llcp_sock *sock, *new_sock;
878         u8 dsap, ssap, reason;
879 
880         dsap = nfc_llcp_dsap(skb);
881         ssap = nfc_llcp_ssap(skb);
882 
883         pr_debug("%d %d\n", dsap, ssap);
884 
885         if (dsap != LLCP_SAP_SDP) {
886                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
887                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
888                         reason = LLCP_DM_NOBOUND;
889                         goto fail;
890                 }
891         } else {
892                 u8 *sn;
893                 size_t sn_len;
894 
895                 sn = nfc_llcp_connect_sn(skb, &sn_len);
896                 if (sn == NULL) {
897                         reason = LLCP_DM_NOBOUND;
898                         goto fail;
899                 }
900 
901                 pr_debug("Service name length %zu\n", sn_len);
902 
903                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
904                 if (sock == NULL) {
905                         reason = LLCP_DM_NOBOUND;
906                         goto fail;
907                 }
908         }
909 
910         lock_sock(&sock->sk);
911 
912         parent = &sock->sk;
913 
914         if (sk_acceptq_is_full(parent)) {
915                 reason = LLCP_DM_REJ;
916                 release_sock(&sock->sk);
917                 sock_put(&sock->sk);
918                 goto fail;
919         }
920 
921         if (sock->ssap == LLCP_SDP_UNBOUND) {
922                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
923 
924                 pr_debug("First client, reserving %d\n", ssap);
925 
926                 if (ssap == LLCP_SAP_MAX) {
927                         reason = LLCP_DM_REJ;
928                         release_sock(&sock->sk);
929                         sock_put(&sock->sk);
930                         goto fail;
931                 }
932 
933                 sock->ssap = ssap;
934         }
935 
936         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
937         if (new_sk == NULL) {
938                 reason = LLCP_DM_REJ;
939                 release_sock(&sock->sk);
940                 sock_put(&sock->sk);
941                 goto fail;
942         }
943 
944         new_sock = nfc_llcp_sock(new_sk);
945         new_sock->dev = local->dev;
946         new_sock->local = nfc_llcp_local_get(local);
947         new_sock->rw = sock->rw;
948         new_sock->miux = sock->miux;
949         new_sock->nfc_protocol = sock->nfc_protocol;
950         new_sock->dsap = ssap;
951         new_sock->target_idx = local->target_idx;
952         new_sock->parent = parent;
953         new_sock->ssap = sock->ssap;
954         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
955                 atomic_t *client_count;
956 
957                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
958 
959                 client_count =
960                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
961 
962                 atomic_inc(client_count);
963                 new_sock->reserved_ssap = sock->ssap;
964         }
965 
966         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
967                                       skb->len - LLCP_HEADER_SIZE);
968 
969         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
970 
971         nfc_llcp_sock_link(&local->sockets, new_sk);
972 
973         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
974 
975         nfc_get_device(local->dev->idx);
976 
977         new_sk->sk_state = LLCP_CONNECTED;
978 
979         /* Wake the listening processes */
980         parent->sk_data_ready(parent);
981 
982         /* Send CC */
983         nfc_llcp_send_cc(new_sock);
984 
985         release_sock(&sock->sk);
986         sock_put(&sock->sk);
987 
988         return;
989 
990 fail:
991         /* Send DM */
992         nfc_llcp_send_dm(local, dsap, ssap, reason);
993 }
994 
995 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
996 {
997         int nr_frames = 0;
998         struct nfc_llcp_local *local = sock->local;
999 
1000         pr_debug("Remote ready %d tx queue len %d remote rw %d",
1001                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1002                  sock->remote_rw);
1003 
1004         /* Try to queue some I frames for transmission */
1005         while (sock->remote_ready &&
1006                skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1007                 struct sk_buff *pdu;
1008 
1009                 pdu = skb_dequeue(&sock->tx_queue);
1010                 if (pdu == NULL)
1011                         break;
1012 
1013                 /* Update N(S)/N(R) */
1014                 nfc_llcp_set_nrns(sock, pdu);
1015 
1016                 skb_queue_tail(&local->tx_queue, pdu);
1017                 nr_frames++;
1018         }
1019 
1020         return nr_frames;
1021 }
1022 
1023 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1024                                struct sk_buff *skb)
1025 {
1026         struct nfc_llcp_sock *llcp_sock;
1027         struct sock *sk;
1028         u8 dsap, ssap, ptype, ns, nr;
1029 
1030         ptype = nfc_llcp_ptype(skb);
1031         dsap = nfc_llcp_dsap(skb);
1032         ssap = nfc_llcp_ssap(skb);
1033         ns = nfc_llcp_ns(skb);
1034         nr = nfc_llcp_nr(skb);
1035 
1036         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1037 
1038         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1039         if (llcp_sock == NULL) {
1040                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1041                 return;
1042         }
1043 
1044         sk = &llcp_sock->sk;
1045         lock_sock(sk);
1046         if (sk->sk_state == LLCP_CLOSED) {
1047                 release_sock(sk);
1048                 nfc_llcp_sock_put(llcp_sock);
1049         }
1050 
1051         /* Pass the payload upstream */
1052         if (ptype == LLCP_PDU_I) {
1053                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1054 
1055                 if (ns == llcp_sock->recv_n)
1056                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1057                 else
1058                         pr_err("Received out of sequence I PDU\n");
1059 
1060                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1061                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1062                         /*
1063                          * I frames will be freed from the socket layer, so we
1064                          * need to keep them alive until someone receives them.
1065                          */
1066                         skb_get(skb);
1067                 } else {
1068                         pr_err("Receive queue is full\n");
1069                 }
1070         }
1071 
1072         /* Remove skbs from the pending queue */
1073         if (llcp_sock->send_ack_n != nr) {
1074                 struct sk_buff *s, *tmp;
1075                 u8 n;
1076 
1077                 llcp_sock->send_ack_n = nr;
1078 
1079                 /* Remove and free all skbs until ns == nr */
1080                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1081                         n = nfc_llcp_ns(s);
1082 
1083                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1084                         kfree_skb(s);
1085 
1086                         if (n == nr)
1087                                 break;
1088                 }
1089 
1090                 /* Re-queue the remaining skbs for transmission */
1091                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1092                                             s, tmp) {
1093                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1094                         skb_queue_head(&local->tx_queue, s);
1095                 }
1096         }
1097 
1098         if (ptype == LLCP_PDU_RR)
1099                 llcp_sock->remote_ready = true;
1100         else if (ptype == LLCP_PDU_RNR)
1101                 llcp_sock->remote_ready = false;
1102 
1103         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1104                 nfc_llcp_send_rr(llcp_sock);
1105 
1106         release_sock(sk);
1107         nfc_llcp_sock_put(llcp_sock);
1108 }
1109 
1110 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1111                                struct sk_buff *skb)
1112 {
1113         struct nfc_llcp_sock *llcp_sock;
1114         struct sock *sk;
1115         u8 dsap, ssap;
1116 
1117         dsap = nfc_llcp_dsap(skb);
1118         ssap = nfc_llcp_ssap(skb);
1119 
1120         if ((dsap == 0) && (ssap == 0)) {
1121                 pr_debug("Connection termination");
1122                 nfc_dep_link_down(local->dev);
1123                 return;
1124         }
1125 
1126         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1127         if (llcp_sock == NULL) {
1128                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1129                 return;
1130         }
1131 
1132         sk = &llcp_sock->sk;
1133         lock_sock(sk);
1134 
1135         nfc_llcp_socket_purge(llcp_sock);
1136 
1137         if (sk->sk_state == LLCP_CLOSED) {
1138                 release_sock(sk);
1139                 nfc_llcp_sock_put(llcp_sock);
1140         }
1141 
1142         if (sk->sk_state == LLCP_CONNECTED) {
1143                 nfc_put_device(local->dev);
1144                 sk->sk_state = LLCP_CLOSED;
1145                 sk->sk_state_change(sk);
1146         }
1147 
1148         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1149 
1150         release_sock(sk);
1151         nfc_llcp_sock_put(llcp_sock);
1152 }
1153 
1154 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1155 {
1156         struct nfc_llcp_sock *llcp_sock;
1157         struct sock *sk;
1158         u8 dsap, ssap;
1159 
1160         dsap = nfc_llcp_dsap(skb);
1161         ssap = nfc_llcp_ssap(skb);
1162 
1163         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1164         if (llcp_sock == NULL) {
1165                 pr_err("Invalid CC\n");
1166                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1167 
1168                 return;
1169         }
1170 
1171         sk = &llcp_sock->sk;
1172 
1173         /* Unlink from connecting and link to the client array */
1174         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1175         nfc_llcp_sock_link(&local->sockets, sk);
1176         llcp_sock->dsap = ssap;
1177 
1178         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1179                                       skb->len - LLCP_HEADER_SIZE);
1180 
1181         sk->sk_state = LLCP_CONNECTED;
1182         sk->sk_state_change(sk);
1183 
1184         nfc_llcp_sock_put(llcp_sock);
1185 }
1186 
1187 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1188 {
1189         struct nfc_llcp_sock *llcp_sock;
1190         struct sock *sk;
1191         u8 dsap, ssap, reason;
1192 
1193         dsap = nfc_llcp_dsap(skb);
1194         ssap = nfc_llcp_ssap(skb);
1195         reason = skb->data[2];
1196 
1197         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1198 
1199         switch (reason) {
1200         case LLCP_DM_NOBOUND:
1201         case LLCP_DM_REJ:
1202                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1203                 break;
1204 
1205         default:
1206                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1207                 break;
1208         }
1209 
1210         if (llcp_sock == NULL) {
1211                 pr_debug("Already closed\n");
1212                 return;
1213         }
1214 
1215         sk = &llcp_sock->sk;
1216 
1217         sk->sk_err = ENXIO;
1218         sk->sk_state = LLCP_CLOSED;
1219         sk->sk_state_change(sk);
1220 
1221         nfc_llcp_sock_put(llcp_sock);
1222 }
1223 
1224 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1225                               struct sk_buff *skb)
1226 {
1227         struct nfc_llcp_sock *llcp_sock;
1228         u8 dsap, ssap, *tlv, type, length, tid, sap;
1229         u16 tlv_len, offset;
1230         char *service_name;
1231         size_t service_name_len;
1232         struct nfc_llcp_sdp_tlv *sdp;
1233         HLIST_HEAD(llc_sdres_list);
1234         size_t sdres_tlvs_len;
1235         HLIST_HEAD(nl_sdres_list);
1236 
1237         dsap = nfc_llcp_dsap(skb);
1238         ssap = nfc_llcp_ssap(skb);
1239 
1240         pr_debug("%d %d\n", dsap, ssap);
1241 
1242         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1243                 pr_err("Wrong SNL SAP\n");
1244                 return;
1245         }
1246 
1247         tlv = &skb->data[LLCP_HEADER_SIZE];
1248         tlv_len = skb->len - LLCP_HEADER_SIZE;
1249         offset = 0;
1250         sdres_tlvs_len = 0;
1251 
1252         while (offset < tlv_len) {
1253                 type = tlv[0];
1254                 length = tlv[1];
1255 
1256                 switch (type) {
1257                 case LLCP_TLV_SDREQ:
1258                         tid = tlv[2];
1259                         service_name = (char *) &tlv[3];
1260                         service_name_len = length - 1;
1261 
1262                         pr_debug("Looking for %.16s\n", service_name);
1263 
1264                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1265                             !strncmp(service_name, "urn:nfc:sn:sdp",
1266                                      service_name_len)) {
1267                                 sap = 1;
1268                                 goto add_snl;
1269                         }
1270 
1271                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1272                                                           service_name_len);
1273                         if (!llcp_sock) {
1274                                 sap = 0;
1275                                 goto add_snl;
1276                         }
1277 
1278                         /*
1279                          * We found a socket but its ssap has not been reserved
1280                          * yet. We need to assign it for good and send a reply.
1281                          * The ssap will be freed when the socket is closed.
1282                          */
1283                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1284                                 atomic_t *client_count;
1285 
1286                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1287 
1288                                 pr_debug("Reserving %d\n", sap);
1289 
1290                                 if (sap == LLCP_SAP_MAX) {
1291                                         sap = 0;
1292                                         goto add_snl;
1293                                 }
1294 
1295                                 client_count =
1296                                         &local->local_sdp_cnt[sap -
1297                                                               LLCP_WKS_NUM_SAP];
1298 
1299                                 atomic_inc(client_count);
1300 
1301                                 llcp_sock->ssap = sap;
1302                                 llcp_sock->reserved_ssap = sap;
1303                         } else {
1304                                 sap = llcp_sock->ssap;
1305                         }
1306 
1307                         pr_debug("%p %d\n", llcp_sock, sap);
1308 
1309 add_snl:
1310                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1311                         if (sdp == NULL)
1312                                 goto exit;
1313 
1314                         sdres_tlvs_len += sdp->tlv_len;
1315                         hlist_add_head(&sdp->node, &llc_sdres_list);
1316                         break;
1317 
1318                 case LLCP_TLV_SDRES:
1319                         mutex_lock(&local->sdreq_lock);
1320 
1321                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1322 
1323                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1324                                 if (sdp->tid != tlv[2])
1325                                         continue;
1326 
1327                                 sdp->sap = tlv[3];
1328 
1329                                 pr_debug("Found: uri=%s, sap=%d\n",
1330                                          sdp->uri, sdp->sap);
1331 
1332                                 hlist_del(&sdp->node);
1333 
1334                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1335 
1336                                 break;
1337                         }
1338 
1339                         mutex_unlock(&local->sdreq_lock);
1340                         break;
1341 
1342                 default:
1343                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1344                         break;
1345                 }
1346 
1347                 offset += length + 2;
1348                 tlv += length + 2;
1349         }
1350 
1351 exit:
1352         if (!hlist_empty(&nl_sdres_list))
1353                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1354 
1355         if (!hlist_empty(&llc_sdres_list))
1356                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1357 }
1358 
1359 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1360 {
1361         u8 ptype;
1362         u16 pdu_len;
1363         struct sk_buff *new_skb;
1364 
1365         if (skb->len <= LLCP_HEADER_SIZE) {
1366                 pr_err("Malformed AGF PDU\n");
1367                 return;
1368         }
1369 
1370         skb_pull(skb, LLCP_HEADER_SIZE);
1371 
1372         while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1373                 pdu_len = skb->data[0] << 8 | skb->data[1];
1374 
1375                 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1376 
1377                 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1378                         pr_err("Malformed AGF PDU\n");
1379                         return;
1380                 }
1381 
1382                 ptype = nfc_llcp_ptype(skb);
1383 
1384                 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1385                         goto next;
1386 
1387                 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1388                 if (new_skb == NULL) {
1389                         pr_err("Could not allocate PDU\n");
1390                         return;
1391                 }
1392 
1393                 skb_put_data(new_skb, skb->data, pdu_len);
1394 
1395                 nfc_llcp_rx_skb(local, new_skb);
1396 
1397                 kfree_skb(new_skb);
1398 next:
1399                 skb_pull(skb, pdu_len);
1400         }
1401 }
1402 
1403 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1404 {
1405         u8 dsap, ssap, ptype;
1406 
1407         ptype = nfc_llcp_ptype(skb);
1408         dsap = nfc_llcp_dsap(skb);
1409         ssap = nfc_llcp_ssap(skb);
1410 
1411         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1412 
1413         if (ptype != LLCP_PDU_SYMM)
1414                 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1415                                      skb->data, skb->len, true);
1416 
1417         switch (ptype) {
1418         case LLCP_PDU_SYMM:
1419                 pr_debug("SYMM\n");
1420                 break;
1421 
1422         case LLCP_PDU_UI:
1423                 pr_debug("UI\n");
1424                 nfc_llcp_recv_ui(local, skb);
1425                 break;
1426 
1427         case LLCP_PDU_CONNECT:
1428                 pr_debug("CONNECT\n");
1429                 nfc_llcp_recv_connect(local, skb);
1430                 break;
1431 
1432         case LLCP_PDU_DISC:
1433                 pr_debug("DISC\n");
1434                 nfc_llcp_recv_disc(local, skb);
1435                 break;
1436 
1437         case LLCP_PDU_CC:
1438                 pr_debug("CC\n");
1439                 nfc_llcp_recv_cc(local, skb);
1440                 break;
1441 
1442         case LLCP_PDU_DM:
1443                 pr_debug("DM\n");
1444                 nfc_llcp_recv_dm(local, skb);
1445                 break;
1446 
1447         case LLCP_PDU_SNL:
1448                 pr_debug("SNL\n");
1449                 nfc_llcp_recv_snl(local, skb);
1450                 break;
1451 
1452         case LLCP_PDU_I:
1453         case LLCP_PDU_RR:
1454         case LLCP_PDU_RNR:
1455                 pr_debug("I frame\n");
1456                 nfc_llcp_recv_hdlc(local, skb);
1457                 break;
1458 
1459         case LLCP_PDU_AGF:
1460                 pr_debug("AGF frame\n");
1461                 nfc_llcp_recv_agf(local, skb);
1462                 break;
1463         }
1464 }
1465 
1466 static void nfc_llcp_rx_work(struct work_struct *work)
1467 {
1468         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1469                                                     rx_work);
1470         struct sk_buff *skb;
1471 
1472         skb = local->rx_pending;
1473         if (skb == NULL) {
1474                 pr_debug("No pending SKB\n");
1475                 return;
1476         }
1477 
1478         __net_timestamp(skb);
1479 
1480         nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1481 
1482         nfc_llcp_rx_skb(local, skb);
1483 
1484         schedule_work(&local->tx_work);
1485         kfree_skb(local->rx_pending);
1486         local->rx_pending = NULL;
1487 }
1488 
1489 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1490 {
1491         local->rx_pending = skb;
1492         del_timer(&local->link_timer);
1493         schedule_work(&local->rx_work);
1494 }
1495 
1496 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1497 {
1498         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1499 
1500         pr_debug("Received an LLCP PDU\n");
1501         if (err < 0) {
1502                 pr_err("err %d\n", err);
1503                 return;
1504         }
1505 
1506         __nfc_llcp_recv(local, skb);
1507 }
1508 
1509 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1510 {
1511         struct nfc_llcp_local *local;
1512 
1513         local = nfc_llcp_find_local(dev);
1514         if (local == NULL) {
1515                 kfree_skb(skb);
1516                 return -ENODEV;
1517         }
1518 
1519         __nfc_llcp_recv(local, skb);
1520 
1521         return 0;
1522 }
1523 
1524 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1525 {
1526         struct nfc_llcp_local *local;
1527 
1528         local = nfc_llcp_find_local(dev);
1529         if (local == NULL)
1530                 return;
1531 
1532         local->remote_miu = LLCP_DEFAULT_MIU;
1533         local->remote_lto = LLCP_DEFAULT_LTO;
1534 
1535         /* Close and purge all existing sockets */
1536         nfc_llcp_socket_release(local, true, 0);
1537 }
1538 
1539 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1540                         u8 comm_mode, u8 rf_mode)
1541 {
1542         struct nfc_llcp_local *local;
1543 
1544         pr_debug("rf mode %d\n", rf_mode);
1545 
1546         local = nfc_llcp_find_local(dev);
1547         if (local == NULL)
1548                 return;
1549 
1550         local->target_idx = target_idx;
1551         local->comm_mode = comm_mode;
1552         local->rf_mode = rf_mode;
1553 
1554         if (rf_mode == NFC_RF_INITIATOR) {
1555                 pr_debug("Queueing Tx work\n");
1556 
1557                 schedule_work(&local->tx_work);
1558         } else {
1559                 mod_timer(&local->link_timer,
1560                           jiffies + msecs_to_jiffies(local->remote_lto));
1561         }
1562 }
1563 
1564 int nfc_llcp_register_device(struct nfc_dev *ndev)
1565 {
1566         struct nfc_llcp_local *local;
1567 
1568         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1569         if (local == NULL)
1570                 return -ENOMEM;
1571 
1572         local->dev = ndev;
1573         INIT_LIST_HEAD(&local->list);
1574         kref_init(&local->ref);
1575         mutex_init(&local->sdp_lock);
1576         timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0);
1577 
1578         skb_queue_head_init(&local->tx_queue);
1579         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1580 
1581         local->rx_pending = NULL;
1582         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1583 
1584         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1585 
1586         rwlock_init(&local->sockets.lock);
1587         rwlock_init(&local->connecting_sockets.lock);
1588         rwlock_init(&local->raw_sockets.lock);
1589 
1590         local->lto = 150; /* 1500 ms */
1591         local->rw = LLCP_MAX_RW;
1592         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1593         local->local_wks = 0x1; /* LLC Link Management */
1594 
1595         nfc_llcp_build_gb(local);
1596 
1597         local->remote_miu = LLCP_DEFAULT_MIU;
1598         local->remote_lto = LLCP_DEFAULT_LTO;
1599 
1600         mutex_init(&local->sdreq_lock);
1601         INIT_HLIST_HEAD(&local->pending_sdreqs);
1602         timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
1603         INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1604 
1605         list_add(&local->list, &llcp_devices);
1606 
1607         return 0;
1608 }
1609 
1610 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1611 {
1612         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1613 
1614         if (local == NULL) {
1615                 pr_debug("No such device\n");
1616                 return;
1617         }
1618 
1619         local_cleanup(local);
1620 
1621         nfc_llcp_local_put(local);
1622 }
1623 
1624 int __init nfc_llcp_init(void)
1625 {
1626         return nfc_llcp_sock_init();
1627 }
1628 
1629 void nfc_llcp_exit(void)
1630 {
1631         nfc_llcp_sock_exit();
1632 }
1633 

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