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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(unsigned long data)
246 {
247         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
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(unsigned long data)
289 {
290         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
291 
292         schedule_work(&local->sdreq_timeout_work);
293 }
294 
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(KERN_DEBUG, "LLCP Tx: ",
736                                        DUMP_PREFIX_OFFSET, 16, 1,
737                                        skb->data, skb->len, true);
738 
739                         if (ptype == LLCP_PDU_DISC && sk != NULL &&
740                             sk->sk_state == LLCP_DISCONNECTING) {
741                                 nfc_llcp_sock_unlink(&local->sockets, sk);
742                                 sock_orphan(sk);
743                                 sock_put(sk);
744                         }
745 
746                         if (ptype == LLCP_PDU_I)
747                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
748 
749                         __net_timestamp(skb);
750 
751                         nfc_llcp_send_to_raw_sock(local, skb,
752                                                   NFC_DIRECTION_TX);
753 
754                         ret = nfc_data_exchange(local->dev, local->target_idx,
755                                                 skb, nfc_llcp_recv, local);
756 
757                         if (ret) {
758                                 kfree_skb(copy_skb);
759                                 goto out;
760                         }
761 
762                         if (ptype == LLCP_PDU_I && copy_skb)
763                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
764                                                copy_skb);
765                 }
766         } else {
767                 nfc_llcp_send_symm(local->dev);
768         }
769 
770 out:
771         mod_timer(&local->link_timer,
772                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
773 }
774 
775 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
776                                                           u8 ssap)
777 {
778         struct sock *sk;
779         struct nfc_llcp_sock *llcp_sock;
780 
781         read_lock(&local->connecting_sockets.lock);
782 
783         sk_for_each(sk, &local->connecting_sockets.head) {
784                 llcp_sock = nfc_llcp_sock(sk);
785 
786                 if (llcp_sock->ssap == ssap) {
787                         sock_hold(&llcp_sock->sk);
788                         goto out;
789                 }
790         }
791 
792         llcp_sock = NULL;
793 
794 out:
795         read_unlock(&local->connecting_sockets.lock);
796 
797         return llcp_sock;
798 }
799 
800 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
801                                                   u8 *sn, size_t sn_len)
802 {
803         struct nfc_llcp_sock *llcp_sock;
804 
805         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
806 
807         if (llcp_sock == NULL)
808                 return NULL;
809 
810         sock_hold(&llcp_sock->sk);
811 
812         return llcp_sock;
813 }
814 
815 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
816 {
817         u8 *tlv = &skb->data[2], type, length;
818         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
819 
820         while (offset < tlv_array_len) {
821                 type = tlv[0];
822                 length = tlv[1];
823 
824                 pr_debug("type 0x%x length %d\n", type, length);
825 
826                 if (type == LLCP_TLV_SN) {
827                         *sn_len = length;
828                         return &tlv[2];
829                 }
830 
831                 offset += length + 2;
832                 tlv += length + 2;
833         }
834 
835         return NULL;
836 }
837 
838 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
839                              struct sk_buff *skb)
840 {
841         struct nfc_llcp_sock *llcp_sock;
842         struct nfc_llcp_ui_cb *ui_cb;
843         u8 dsap, ssap;
844 
845         dsap = nfc_llcp_dsap(skb);
846         ssap = nfc_llcp_ssap(skb);
847 
848         ui_cb = nfc_llcp_ui_skb_cb(skb);
849         ui_cb->dsap = dsap;
850         ui_cb->ssap = ssap;
851 
852         pr_debug("%d %d\n", dsap, ssap);
853 
854         /* We're looking for a bound socket, not a client one */
855         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
856         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
857                 return;
858 
859         /* There is no sequence with UI frames */
860         skb_pull(skb, LLCP_HEADER_SIZE);
861         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
862                 /*
863                  * UI frames will be freed from the socket layer, so we
864                  * need to keep them alive until someone receives them.
865                  */
866                 skb_get(skb);
867         } else {
868                 pr_err("Receive queue is full\n");
869         }
870 
871         nfc_llcp_sock_put(llcp_sock);
872 }
873 
874 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
875                                   struct sk_buff *skb)
876 {
877         struct sock *new_sk, *parent;
878         struct nfc_llcp_sock *sock, *new_sock;
879         u8 dsap, ssap, reason;
880 
881         dsap = nfc_llcp_dsap(skb);
882         ssap = nfc_llcp_ssap(skb);
883 
884         pr_debug("%d %d\n", dsap, ssap);
885 
886         if (dsap != LLCP_SAP_SDP) {
887                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
888                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
889                         reason = LLCP_DM_NOBOUND;
890                         goto fail;
891                 }
892         } else {
893                 u8 *sn;
894                 size_t sn_len;
895 
896                 sn = nfc_llcp_connect_sn(skb, &sn_len);
897                 if (sn == NULL) {
898                         reason = LLCP_DM_NOBOUND;
899                         goto fail;
900                 }
901 
902                 pr_debug("Service name length %zu\n", sn_len);
903 
904                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
905                 if (sock == NULL) {
906                         reason = LLCP_DM_NOBOUND;
907                         goto fail;
908                 }
909         }
910 
911         lock_sock(&sock->sk);
912 
913         parent = &sock->sk;
914 
915         if (sk_acceptq_is_full(parent)) {
916                 reason = LLCP_DM_REJ;
917                 release_sock(&sock->sk);
918                 sock_put(&sock->sk);
919                 goto fail;
920         }
921 
922         if (sock->ssap == LLCP_SDP_UNBOUND) {
923                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
924 
925                 pr_debug("First client, reserving %d\n", ssap);
926 
927                 if (ssap == LLCP_SAP_MAX) {
928                         reason = LLCP_DM_REJ;
929                         release_sock(&sock->sk);
930                         sock_put(&sock->sk);
931                         goto fail;
932                 }
933 
934                 sock->ssap = ssap;
935         }
936 
937         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
938         if (new_sk == NULL) {
939                 reason = LLCP_DM_REJ;
940                 release_sock(&sock->sk);
941                 sock_put(&sock->sk);
942                 goto fail;
943         }
944 
945         new_sock = nfc_llcp_sock(new_sk);
946         new_sock->dev = local->dev;
947         new_sock->local = nfc_llcp_local_get(local);
948         new_sock->rw = sock->rw;
949         new_sock->miux = sock->miux;
950         new_sock->nfc_protocol = sock->nfc_protocol;
951         new_sock->dsap = ssap;
952         new_sock->target_idx = local->target_idx;
953         new_sock->parent = parent;
954         new_sock->ssap = sock->ssap;
955         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
956                 atomic_t *client_count;
957 
958                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
959 
960                 client_count =
961                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
962 
963                 atomic_inc(client_count);
964                 new_sock->reserved_ssap = sock->ssap;
965         }
966 
967         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
968                                       skb->len - LLCP_HEADER_SIZE);
969 
970         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
971 
972         nfc_llcp_sock_link(&local->sockets, new_sk);
973 
974         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
975 
976         nfc_get_device(local->dev->idx);
977 
978         new_sk->sk_state = LLCP_CONNECTED;
979 
980         /* Wake the listening processes */
981         parent->sk_data_ready(parent);
982 
983         /* Send CC */
984         nfc_llcp_send_cc(new_sock);
985 
986         release_sock(&sock->sk);
987         sock_put(&sock->sk);
988 
989         return;
990 
991 fail:
992         /* Send DM */
993         nfc_llcp_send_dm(local, dsap, ssap, reason);
994 }
995 
996 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
997 {
998         int nr_frames = 0;
999         struct nfc_llcp_local *local = sock->local;
1000 
1001         pr_debug("Remote ready %d tx queue len %d remote rw %d",
1002                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1003                  sock->remote_rw);
1004 
1005         /* Try to queue some I frames for transmission */
1006         while (sock->remote_ready &&
1007                skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1008                 struct sk_buff *pdu;
1009 
1010                 pdu = skb_dequeue(&sock->tx_queue);
1011                 if (pdu == NULL)
1012                         break;
1013 
1014                 /* Update N(S)/N(R) */
1015                 nfc_llcp_set_nrns(sock, pdu);
1016 
1017                 skb_queue_tail(&local->tx_queue, pdu);
1018                 nr_frames++;
1019         }
1020 
1021         return nr_frames;
1022 }
1023 
1024 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1025                                struct sk_buff *skb)
1026 {
1027         struct nfc_llcp_sock *llcp_sock;
1028         struct sock *sk;
1029         u8 dsap, ssap, ptype, ns, nr;
1030 
1031         ptype = nfc_llcp_ptype(skb);
1032         dsap = nfc_llcp_dsap(skb);
1033         ssap = nfc_llcp_ssap(skb);
1034         ns = nfc_llcp_ns(skb);
1035         nr = nfc_llcp_nr(skb);
1036 
1037         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1038 
1039         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1040         if (llcp_sock == NULL) {
1041                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1042                 return;
1043         }
1044 
1045         sk = &llcp_sock->sk;
1046         lock_sock(sk);
1047         if (sk->sk_state == LLCP_CLOSED) {
1048                 release_sock(sk);
1049                 nfc_llcp_sock_put(llcp_sock);
1050         }
1051 
1052         /* Pass the payload upstream */
1053         if (ptype == LLCP_PDU_I) {
1054                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1055 
1056                 if (ns == llcp_sock->recv_n)
1057                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1058                 else
1059                         pr_err("Received out of sequence I PDU\n");
1060 
1061                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1062                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1063                         /*
1064                          * I frames will be freed from the socket layer, so we
1065                          * need to keep them alive until someone receives them.
1066                          */
1067                         skb_get(skb);
1068                 } else {
1069                         pr_err("Receive queue is full\n");
1070                 }
1071         }
1072 
1073         /* Remove skbs from the pending queue */
1074         if (llcp_sock->send_ack_n != nr) {
1075                 struct sk_buff *s, *tmp;
1076                 u8 n;
1077 
1078                 llcp_sock->send_ack_n = nr;
1079 
1080                 /* Remove and free all skbs until ns == nr */
1081                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1082                         n = nfc_llcp_ns(s);
1083 
1084                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1085                         kfree_skb(s);
1086 
1087                         if (n == nr)
1088                                 break;
1089                 }
1090 
1091                 /* Re-queue the remaining skbs for transmission */
1092                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1093                                             s, tmp) {
1094                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1095                         skb_queue_head(&local->tx_queue, s);
1096                 }
1097         }
1098 
1099         if (ptype == LLCP_PDU_RR)
1100                 llcp_sock->remote_ready = true;
1101         else if (ptype == LLCP_PDU_RNR)
1102                 llcp_sock->remote_ready = false;
1103 
1104         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1105                 nfc_llcp_send_rr(llcp_sock);
1106 
1107         release_sock(sk);
1108         nfc_llcp_sock_put(llcp_sock);
1109 }
1110 
1111 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1112                                struct sk_buff *skb)
1113 {
1114         struct nfc_llcp_sock *llcp_sock;
1115         struct sock *sk;
1116         u8 dsap, ssap;
1117 
1118         dsap = nfc_llcp_dsap(skb);
1119         ssap = nfc_llcp_ssap(skb);
1120 
1121         if ((dsap == 0) && (ssap == 0)) {
1122                 pr_debug("Connection termination");
1123                 nfc_dep_link_down(local->dev);
1124                 return;
1125         }
1126 
1127         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1128         if (llcp_sock == NULL) {
1129                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1130                 return;
1131         }
1132 
1133         sk = &llcp_sock->sk;
1134         lock_sock(sk);
1135 
1136         nfc_llcp_socket_purge(llcp_sock);
1137 
1138         if (sk->sk_state == LLCP_CLOSED) {
1139                 release_sock(sk);
1140                 nfc_llcp_sock_put(llcp_sock);
1141         }
1142 
1143         if (sk->sk_state == LLCP_CONNECTED) {
1144                 nfc_put_device(local->dev);
1145                 sk->sk_state = LLCP_CLOSED;
1146                 sk->sk_state_change(sk);
1147         }
1148 
1149         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1150 
1151         release_sock(sk);
1152         nfc_llcp_sock_put(llcp_sock);
1153 }
1154 
1155 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1156 {
1157         struct nfc_llcp_sock *llcp_sock;
1158         struct sock *sk;
1159         u8 dsap, ssap;
1160 
1161         dsap = nfc_llcp_dsap(skb);
1162         ssap = nfc_llcp_ssap(skb);
1163 
1164         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1165         if (llcp_sock == NULL) {
1166                 pr_err("Invalid CC\n");
1167                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1168 
1169                 return;
1170         }
1171 
1172         sk = &llcp_sock->sk;
1173 
1174         /* Unlink from connecting and link to the client array */
1175         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1176         nfc_llcp_sock_link(&local->sockets, sk);
1177         llcp_sock->dsap = ssap;
1178 
1179         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1180                                       skb->len - LLCP_HEADER_SIZE);
1181 
1182         sk->sk_state = LLCP_CONNECTED;
1183         sk->sk_state_change(sk);
1184 
1185         nfc_llcp_sock_put(llcp_sock);
1186 }
1187 
1188 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1189 {
1190         struct nfc_llcp_sock *llcp_sock;
1191         struct sock *sk;
1192         u8 dsap, ssap, reason;
1193 
1194         dsap = nfc_llcp_dsap(skb);
1195         ssap = nfc_llcp_ssap(skb);
1196         reason = skb->data[2];
1197 
1198         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1199 
1200         switch (reason) {
1201         case LLCP_DM_NOBOUND:
1202         case LLCP_DM_REJ:
1203                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1204                 break;
1205 
1206         default:
1207                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1208                 break;
1209         }
1210 
1211         if (llcp_sock == NULL) {
1212                 pr_debug("Already closed\n");
1213                 return;
1214         }
1215 
1216         sk = &llcp_sock->sk;
1217 
1218         sk->sk_err = ENXIO;
1219         sk->sk_state = LLCP_CLOSED;
1220         sk->sk_state_change(sk);
1221 
1222         nfc_llcp_sock_put(llcp_sock);
1223 }
1224 
1225 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1226                               struct sk_buff *skb)
1227 {
1228         struct nfc_llcp_sock *llcp_sock;
1229         u8 dsap, ssap, *tlv, type, length, tid, sap;
1230         u16 tlv_len, offset;
1231         char *service_name;
1232         size_t service_name_len;
1233         struct nfc_llcp_sdp_tlv *sdp;
1234         HLIST_HEAD(llc_sdres_list);
1235         size_t sdres_tlvs_len;
1236         HLIST_HEAD(nl_sdres_list);
1237 
1238         dsap = nfc_llcp_dsap(skb);
1239         ssap = nfc_llcp_ssap(skb);
1240 
1241         pr_debug("%d %d\n", dsap, ssap);
1242 
1243         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1244                 pr_err("Wrong SNL SAP\n");
1245                 return;
1246         }
1247 
1248         tlv = &skb->data[LLCP_HEADER_SIZE];
1249         tlv_len = skb->len - LLCP_HEADER_SIZE;
1250         offset = 0;
1251         sdres_tlvs_len = 0;
1252 
1253         while (offset < tlv_len) {
1254                 type = tlv[0];
1255                 length = tlv[1];
1256 
1257                 switch (type) {
1258                 case LLCP_TLV_SDREQ:
1259                         tid = tlv[2];
1260                         service_name = (char *) &tlv[3];
1261                         service_name_len = length - 1;
1262 
1263                         pr_debug("Looking for %.16s\n", service_name);
1264 
1265                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1266                             !strncmp(service_name, "urn:nfc:sn:sdp",
1267                                      service_name_len)) {
1268                                 sap = 1;
1269                                 goto add_snl;
1270                         }
1271 
1272                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1273                                                           service_name_len);
1274                         if (!llcp_sock) {
1275                                 sap = 0;
1276                                 goto add_snl;
1277                         }
1278 
1279                         /*
1280                          * We found a socket but its ssap has not been reserved
1281                          * yet. We need to assign it for good and send a reply.
1282                          * The ssap will be freed when the socket is closed.
1283                          */
1284                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1285                                 atomic_t *client_count;
1286 
1287                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1288 
1289                                 pr_debug("Reserving %d\n", sap);
1290 
1291                                 if (sap == LLCP_SAP_MAX) {
1292                                         sap = 0;
1293                                         goto add_snl;
1294                                 }
1295 
1296                                 client_count =
1297                                         &local->local_sdp_cnt[sap -
1298                                                               LLCP_WKS_NUM_SAP];
1299 
1300                                 atomic_inc(client_count);
1301 
1302                                 llcp_sock->ssap = sap;
1303                                 llcp_sock->reserved_ssap = sap;
1304                         } else {
1305                                 sap = llcp_sock->ssap;
1306                         }
1307 
1308                         pr_debug("%p %d\n", llcp_sock, sap);
1309 
1310 add_snl:
1311                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1312                         if (sdp == NULL)
1313                                 goto exit;
1314 
1315                         sdres_tlvs_len += sdp->tlv_len;
1316                         hlist_add_head(&sdp->node, &llc_sdres_list);
1317                         break;
1318 
1319                 case LLCP_TLV_SDRES:
1320                         mutex_lock(&local->sdreq_lock);
1321 
1322                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1323 
1324                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1325                                 if (sdp->tid != tlv[2])
1326                                         continue;
1327 
1328                                 sdp->sap = tlv[3];
1329 
1330                                 pr_debug("Found: uri=%s, sap=%d\n",
1331                                          sdp->uri, sdp->sap);
1332 
1333                                 hlist_del(&sdp->node);
1334 
1335                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1336 
1337                                 break;
1338                         }
1339 
1340                         mutex_unlock(&local->sdreq_lock);
1341                         break;
1342 
1343                 default:
1344                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1345                         break;
1346                 }
1347 
1348                 offset += length + 2;
1349                 tlv += length + 2;
1350         }
1351 
1352 exit:
1353         if (!hlist_empty(&nl_sdres_list))
1354                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1355 
1356         if (!hlist_empty(&llc_sdres_list))
1357                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1358 }
1359 
1360 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1361 {
1362         u8 ptype;
1363         u16 pdu_len;
1364         struct sk_buff *new_skb;
1365 
1366         if (skb->len <= LLCP_HEADER_SIZE) {
1367                 pr_err("Malformed AGF PDU\n");
1368                 return;
1369         }
1370 
1371         skb_pull(skb, LLCP_HEADER_SIZE);
1372 
1373         while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1374                 pdu_len = skb->data[0] << 8 | skb->data[1];
1375 
1376                 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1377 
1378                 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1379                         pr_err("Malformed AGF PDU\n");
1380                         return;
1381                 }
1382 
1383                 ptype = nfc_llcp_ptype(skb);
1384 
1385                 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1386                         goto next;
1387 
1388                 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1389                 if (new_skb == NULL) {
1390                         pr_err("Could not allocate PDU\n");
1391                         return;
1392                 }
1393 
1394                 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1395 
1396                 nfc_llcp_rx_skb(local, new_skb);
1397 
1398                 kfree_skb(new_skb);
1399 next:
1400                 skb_pull(skb, pdu_len);
1401         }
1402 }
1403 
1404 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1405 {
1406         u8 dsap, ssap, ptype;
1407 
1408         ptype = nfc_llcp_ptype(skb);
1409         dsap = nfc_llcp_dsap(skb);
1410         ssap = nfc_llcp_ssap(skb);
1411 
1412         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1413 
1414         if (ptype != LLCP_PDU_SYMM)
1415                 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1416                                16, 1, skb->data, skb->len, true);
1417 
1418         switch (ptype) {
1419         case LLCP_PDU_SYMM:
1420                 pr_debug("SYMM\n");
1421                 break;
1422 
1423         case LLCP_PDU_UI:
1424                 pr_debug("UI\n");
1425                 nfc_llcp_recv_ui(local, skb);
1426                 break;
1427 
1428         case LLCP_PDU_CONNECT:
1429                 pr_debug("CONNECT\n");
1430                 nfc_llcp_recv_connect(local, skb);
1431                 break;
1432 
1433         case LLCP_PDU_DISC:
1434                 pr_debug("DISC\n");
1435                 nfc_llcp_recv_disc(local, skb);
1436                 break;
1437 
1438         case LLCP_PDU_CC:
1439                 pr_debug("CC\n");
1440                 nfc_llcp_recv_cc(local, skb);
1441                 break;
1442 
1443         case LLCP_PDU_DM:
1444                 pr_debug("DM\n");
1445                 nfc_llcp_recv_dm(local, skb);
1446                 break;
1447 
1448         case LLCP_PDU_SNL:
1449                 pr_debug("SNL\n");
1450                 nfc_llcp_recv_snl(local, skb);
1451                 break;
1452 
1453         case LLCP_PDU_I:
1454         case LLCP_PDU_RR:
1455         case LLCP_PDU_RNR:
1456                 pr_debug("I frame\n");
1457                 nfc_llcp_recv_hdlc(local, skb);
1458                 break;
1459 
1460         case LLCP_PDU_AGF:
1461                 pr_debug("AGF frame\n");
1462                 nfc_llcp_recv_agf(local, skb);
1463                 break;
1464         }
1465 }
1466 
1467 static void nfc_llcp_rx_work(struct work_struct *work)
1468 {
1469         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1470                                                     rx_work);
1471         struct sk_buff *skb;
1472 
1473         skb = local->rx_pending;
1474         if (skb == NULL) {
1475                 pr_debug("No pending SKB\n");
1476                 return;
1477         }
1478 
1479         __net_timestamp(skb);
1480 
1481         nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1482 
1483         nfc_llcp_rx_skb(local, skb);
1484 
1485         schedule_work(&local->tx_work);
1486         kfree_skb(local->rx_pending);
1487         local->rx_pending = NULL;
1488 }
1489 
1490 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1491 {
1492         local->rx_pending = skb;
1493         del_timer(&local->link_timer);
1494         schedule_work(&local->rx_work);
1495 }
1496 
1497 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1498 {
1499         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1500 
1501         pr_debug("Received an LLCP PDU\n");
1502         if (err < 0) {
1503                 pr_err("err %d\n", err);
1504                 return;
1505         }
1506 
1507         __nfc_llcp_recv(local, skb);
1508 }
1509 
1510 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1511 {
1512         struct nfc_llcp_local *local;
1513 
1514         local = nfc_llcp_find_local(dev);
1515         if (local == NULL) {
1516                 kfree_skb(skb);
1517                 return -ENODEV;
1518         }
1519 
1520         __nfc_llcp_recv(local, skb);
1521 
1522         return 0;
1523 }
1524 
1525 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1526 {
1527         struct nfc_llcp_local *local;
1528 
1529         local = nfc_llcp_find_local(dev);
1530         if (local == NULL)
1531                 return;
1532 
1533         local->remote_miu = LLCP_DEFAULT_MIU;
1534         local->remote_lto = LLCP_DEFAULT_LTO;
1535 
1536         /* Close and purge all existing sockets */
1537         nfc_llcp_socket_release(local, true, 0);
1538 }
1539 
1540 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1541                         u8 comm_mode, u8 rf_mode)
1542 {
1543         struct nfc_llcp_local *local;
1544 
1545         pr_debug("rf mode %d\n", rf_mode);
1546 
1547         local = nfc_llcp_find_local(dev);
1548         if (local == NULL)
1549                 return;
1550 
1551         local->target_idx = target_idx;
1552         local->comm_mode = comm_mode;
1553         local->rf_mode = rf_mode;
1554 
1555         if (rf_mode == NFC_RF_INITIATOR) {
1556                 pr_debug("Queueing Tx work\n");
1557 
1558                 schedule_work(&local->tx_work);
1559         } else {
1560                 mod_timer(&local->link_timer,
1561                           jiffies + msecs_to_jiffies(local->remote_lto));
1562         }
1563 }
1564 
1565 int nfc_llcp_register_device(struct nfc_dev *ndev)
1566 {
1567         struct nfc_llcp_local *local;
1568 
1569         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1570         if (local == NULL)
1571                 return -ENOMEM;
1572 
1573         local->dev = ndev;
1574         INIT_LIST_HEAD(&local->list);
1575         kref_init(&local->ref);
1576         mutex_init(&local->sdp_lock);
1577         init_timer(&local->link_timer);
1578         local->link_timer.data = (unsigned long) local;
1579         local->link_timer.function = nfc_llcp_symm_timer;
1580 
1581         skb_queue_head_init(&local->tx_queue);
1582         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1583 
1584         local->rx_pending = NULL;
1585         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1586 
1587         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1588 
1589         rwlock_init(&local->sockets.lock);
1590         rwlock_init(&local->connecting_sockets.lock);
1591         rwlock_init(&local->raw_sockets.lock);
1592 
1593         local->lto = 150; /* 1500 ms */
1594         local->rw = LLCP_MAX_RW;
1595         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1596         local->local_wks = 0x1; /* LLC Link Management */
1597 
1598         nfc_llcp_build_gb(local);
1599 
1600         local->remote_miu = LLCP_DEFAULT_MIU;
1601         local->remote_lto = LLCP_DEFAULT_LTO;
1602 
1603         mutex_init(&local->sdreq_lock);
1604         INIT_HLIST_HEAD(&local->pending_sdreqs);
1605         init_timer(&local->sdreq_timer);
1606         local->sdreq_timer.data = (unsigned long) local;
1607         local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1608         INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1609 
1610         list_add(&local->list, &llcp_devices);
1611 
1612         return 0;
1613 }
1614 
1615 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1616 {
1617         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1618 
1619         if (local == NULL) {
1620                 pr_debug("No such device\n");
1621                 return;
1622         }
1623 
1624         local_cleanup(local);
1625 
1626         nfc_llcp_local_put(local);
1627 }
1628 
1629 int __init nfc_llcp_init(void)
1630 {
1631         return nfc_llcp_sock_init();
1632 }
1633 
1634 void nfc_llcp_exit(void)
1635 {
1636         nfc_llcp_sock_exit();
1637 }
1638 

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