2 * Copyright (C) 2011 Intel Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/list.h>
25 #include <linux/nfc.h>
30 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
32 static struct list_head llcp_devices;
34 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
37 sk_add_node(sk, &l->head);
38 write_unlock(&l->lock);
41 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
45 write_unlock(&l->lock);
48 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen)
51 struct hlist_node *node, *tmp;
52 struct nfc_llcp_sock *llcp_sock;
54 write_lock(&local->sockets.lock);
56 sk_for_each_safe(sk, node, tmp, &local->sockets.head) {
57 llcp_sock = nfc_llcp_sock(sk);
61 if (sk->sk_state == LLCP_CONNECTED)
62 nfc_put_device(llcp_sock->dev);
64 if (sk->sk_state == LLCP_LISTEN) {
65 struct nfc_llcp_sock *lsk, *n;
66 struct sock *accept_sk;
68 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
73 nfc_llcp_accept_unlink(accept_sk);
75 accept_sk->sk_state = LLCP_CLOSED;
77 release_sock(accept_sk);
79 sock_orphan(accept_sk);
88 sk->sk_state = LLCP_CLOSED;
97 write_unlock(&local->sockets.lock);
100 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
102 kref_get(&local->ref);
107 static void local_release(struct kref *ref)
109 struct nfc_llcp_local *local;
111 local = container_of(ref, struct nfc_llcp_local, ref);
113 list_del(&local->list);
114 nfc_llcp_socket_release(local, false);
115 del_timer_sync(&local->link_timer);
116 skb_queue_purge(&local->tx_queue);
117 cancel_work_sync(&local->tx_work);
118 cancel_work_sync(&local->rx_work);
119 cancel_work_sync(&local->timeout_work);
120 kfree_skb(local->rx_pending);
124 int nfc_llcp_local_put(struct nfc_llcp_local *local)
129 return kref_put(&local->ref, local_release);
132 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
136 struct hlist_node *node;
137 struct nfc_llcp_sock *llcp_sock;
139 pr_debug("ssap dsap %d %d\n", ssap, dsap);
141 if (ssap == 0 && dsap == 0)
144 read_lock(&local->sockets.lock);
148 sk_for_each(sk, node, &local->sockets.head) {
149 llcp_sock = nfc_llcp_sock(sk);
151 if (llcp_sock->ssap == ssap && llcp_sock->dsap == dsap)
155 read_unlock(&local->sockets.lock);
157 if (llcp_sock == NULL)
160 sock_hold(&llcp_sock->sk);
165 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
170 static void nfc_llcp_timeout_work(struct work_struct *work)
172 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
175 nfc_dep_link_down(local->dev);
178 static void nfc_llcp_symm_timer(unsigned long data)
180 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
182 pr_err("SYMM timeout\n");
184 queue_work(system_nrt_wq, &local->timeout_work);
187 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
189 struct nfc_llcp_local *local, *n;
191 list_for_each_entry_safe(local, n, &llcp_devices, list)
192 if (local->dev == dev)
195 pr_debug("No device found\n");
200 static char *wks[] = {
208 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
212 pr_debug("%s\n", service_name);
214 if (service_name == NULL)
217 num_wks = ARRAY_SIZE(wks);
219 for (sap = 0; sap < num_wks; sap++) {
220 if (wks[sap] == NULL)
223 if (strncmp(wks[sap], service_name, service_name_len) == 0)
231 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
232 u8 *sn, size_t sn_len)
235 struct hlist_node *node;
236 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
238 pr_debug("sn %zd %p\n", sn_len, sn);
240 if (sn == NULL || sn_len == 0)
243 read_lock(&local->sockets.lock);
247 sk_for_each(sk, node, &local->sockets.head) {
248 tmp_sock = nfc_llcp_sock(sk);
250 pr_debug("llcp sock %p\n", tmp_sock);
252 if (tmp_sock->sk.sk_state != LLCP_LISTEN)
255 if (tmp_sock->service_name == NULL ||
256 tmp_sock->service_name_len == 0)
259 if (tmp_sock->service_name_len != sn_len)
262 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
263 llcp_sock = tmp_sock;
268 read_unlock(&local->sockets.lock);
270 pr_debug("Found llcp sock %p\n", llcp_sock);
275 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
276 struct nfc_llcp_sock *sock)
278 mutex_lock(&local->sdp_lock);
280 if (sock->service_name != NULL && sock->service_name_len > 0) {
281 int ssap = nfc_llcp_wks_sap(sock->service_name,
282 sock->service_name_len);
285 pr_debug("WKS %d\n", ssap);
287 /* This is a WKS, let's check if it's free */
288 if (local->local_wks & BIT(ssap)) {
289 mutex_unlock(&local->sdp_lock);
294 set_bit(ssap, &local->local_wks);
295 mutex_unlock(&local->sdp_lock);
301 * Check if there already is a non WKS socket bound
302 * to this service name.
304 if (nfc_llcp_sock_from_sn(local, sock->service_name,
305 sock->service_name_len) != NULL) {
306 mutex_unlock(&local->sdp_lock);
311 mutex_unlock(&local->sdp_lock);
313 return LLCP_SDP_UNBOUND;
315 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
316 if (!test_bit(sock->ssap, &local->local_wks)) {
317 set_bit(sock->ssap, &local->local_wks);
318 mutex_unlock(&local->sdp_lock);
324 mutex_unlock(&local->sdp_lock);
329 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
333 mutex_lock(&local->sdp_lock);
335 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
336 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
337 mutex_unlock(&local->sdp_lock);
341 set_bit(local_ssap, &local->local_sap);
343 mutex_unlock(&local->sdp_lock);
345 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
348 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
353 if (ssap < LLCP_WKS_NUM_SAP) {
355 sdp = &local->local_wks;
356 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
357 atomic_t *client_cnt;
359 local_ssap = ssap - LLCP_WKS_NUM_SAP;
360 sdp = &local->local_sdp;
361 client_cnt = &local->local_sdp_cnt[local_ssap];
363 pr_debug("%d clients\n", atomic_read(client_cnt));
365 mutex_lock(&local->sdp_lock);
367 if (atomic_dec_and_test(client_cnt)) {
368 struct nfc_llcp_sock *l_sock;
370 pr_debug("No more clients for SAP %d\n", ssap);
372 clear_bit(local_ssap, sdp);
374 /* Find the listening sock and set it back to UNBOUND */
375 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
377 l_sock->ssap = LLCP_SDP_UNBOUND;
378 nfc_llcp_sock_put(l_sock);
382 mutex_unlock(&local->sdp_lock);
385 } else if (ssap < LLCP_MAX_SAP) {
386 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
387 sdp = &local->local_sap;
392 mutex_lock(&local->sdp_lock);
394 clear_bit(local_ssap, sdp);
396 mutex_unlock(&local->sdp_lock);
399 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
403 mutex_lock(&local->sdp_lock);
405 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
406 if (ssap == LLCP_SDP_NUM_SAP) {
407 mutex_unlock(&local->sdp_lock);
412 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
414 set_bit(ssap, &local->local_sdp);
416 mutex_unlock(&local->sdp_lock);
418 return LLCP_WKS_NUM_SAP + ssap;
421 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
423 u8 *gb_cur, *version_tlv, version, version_length;
424 u8 *lto_tlv, lto, lto_length;
425 u8 *wks_tlv, wks_length;
426 u8 *miux_tlv, miux_length;
431 version = LLCP_VERSION_11;
432 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
434 gb_len += version_length;
438 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, <o, 1, <o_length);
439 gb_len += lto_length;
441 pr_debug("Local wks 0x%lx\n", local->local_wks);
442 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
444 gb_len += wks_length;
446 miux = cpu_to_be16(LLCP_MAX_MIUX);
447 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
449 gb_len += miux_length;
451 gb_len += ARRAY_SIZE(llcp_magic);
453 if (gb_len > NFC_MAX_GT_LEN) {
460 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
461 gb_cur += ARRAY_SIZE(llcp_magic);
463 memcpy(gb_cur, version_tlv, version_length);
464 gb_cur += version_length;
466 memcpy(gb_cur, lto_tlv, lto_length);
467 gb_cur += lto_length;
469 memcpy(gb_cur, wks_tlv, wks_length);
470 gb_cur += wks_length;
472 memcpy(gb_cur, miux_tlv, miux_length);
473 gb_cur += miux_length;
475 local->gb_len = gb_len;
486 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
488 struct nfc_llcp_local *local;
490 local = nfc_llcp_find_local(dev);
492 *general_bytes_len = 0;
496 nfc_llcp_build_gb(local);
498 *general_bytes_len = local->gb_len;
503 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
505 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
508 pr_err("No LLCP device\n");
512 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
513 memcpy(local->remote_gb, gb, gb_len);
514 local->remote_gb_len = gb_len;
516 if (local->remote_gb == NULL || local->remote_gb_len == 0)
519 if (memcmp(local->remote_gb, llcp_magic, 3)) {
520 pr_err("MAC does not support LLCP\n");
524 return nfc_llcp_parse_gb_tlv(local,
525 &local->remote_gb[3],
526 local->remote_gb_len - 3);
529 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
531 return (pdu->data[0] & 0xfc) >> 2;
534 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
536 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
539 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
541 return pdu->data[1] & 0x3f;
544 static u8 nfc_llcp_ns(struct sk_buff *pdu)
546 return pdu->data[2] >> 4;
549 static u8 nfc_llcp_nr(struct sk_buff *pdu)
551 return pdu->data[2] & 0xf;
554 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
556 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
557 sock->send_n = (sock->send_n + 1) % 16;
558 sock->recv_ack_n = (sock->recv_n - 1) % 16;
561 static void nfc_llcp_tx_work(struct work_struct *work)
563 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
567 struct nfc_llcp_sock *llcp_sock;
569 skb = skb_dequeue(&local->tx_queue);
572 llcp_sock = nfc_llcp_sock(sk);
573 if (llcp_sock != NULL) {
576 pr_debug("Sending pending skb\n");
577 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
578 DUMP_PREFIX_OFFSET, 16, 1,
579 skb->data, skb->len, true);
581 ret = nfc_data_exchange(local->dev, local->target_idx,
582 skb, nfc_llcp_recv, local);
584 if (!ret && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
586 skb_queue_tail(&llcp_sock->tx_pending_queue,
590 nfc_llcp_send_symm(local->dev);
593 nfc_llcp_send_symm(local->dev);
596 mod_timer(&local->link_timer,
597 jiffies + msecs_to_jiffies(2 * local->remote_lto));
600 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
604 struct nfc_llcp_sock *llcp_sock;
605 struct hlist_node *node;
607 read_lock(&local->connecting_sockets.lock);
609 sk_for_each(sk, node, &local->connecting_sockets.head) {
610 llcp_sock = nfc_llcp_sock(sk);
612 if (llcp_sock->ssap == ssap) {
613 sock_hold(&llcp_sock->sk);
621 read_unlock(&local->connecting_sockets.lock);
626 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
627 u8 *sn, size_t sn_len)
629 struct nfc_llcp_sock *llcp_sock;
631 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
633 if (llcp_sock == NULL)
636 sock_hold(&llcp_sock->sk);
641 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
643 u8 *tlv = &skb->data[2], type, length;
644 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
646 while (offset < tlv_array_len) {
650 pr_debug("type 0x%x length %d\n", type, length);
652 if (type == LLCP_TLV_SN) {
657 offset += length + 2;
664 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
667 struct sock *new_sk, *parent;
668 struct nfc_llcp_sock *sock, *new_sock;
669 u8 dsap, ssap, reason;
671 dsap = nfc_llcp_dsap(skb);
672 ssap = nfc_llcp_ssap(skb);
674 pr_debug("%d %d\n", dsap, ssap);
676 if (dsap != LLCP_SAP_SDP) {
677 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
678 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
679 reason = LLCP_DM_NOBOUND;
686 sn = nfc_llcp_connect_sn(skb, &sn_len);
688 reason = LLCP_DM_NOBOUND;
692 pr_debug("Service name length %zu\n", sn_len);
694 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
696 reason = LLCP_DM_NOBOUND;
701 lock_sock(&sock->sk);
705 if (sk_acceptq_is_full(parent)) {
706 reason = LLCP_DM_REJ;
707 release_sock(&sock->sk);
712 if (sock->ssap == LLCP_SDP_UNBOUND) {
713 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
715 pr_debug("First client, reserving %d\n", ssap);
717 if (ssap == LLCP_SAP_MAX) {
718 reason = LLCP_DM_REJ;
719 release_sock(&sock->sk);
727 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
728 if (new_sk == NULL) {
729 reason = LLCP_DM_REJ;
730 release_sock(&sock->sk);
735 new_sock = nfc_llcp_sock(new_sk);
736 new_sock->dev = local->dev;
737 new_sock->local = nfc_llcp_local_get(local);
738 new_sock->miu = local->remote_miu;
739 new_sock->nfc_protocol = sock->nfc_protocol;
740 new_sock->dsap = ssap;
741 new_sock->target_idx = local->target_idx;
742 new_sock->parent = parent;
743 new_sock->ssap = sock->ssap;
744 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
745 atomic_t *client_count;
747 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
750 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
752 atomic_inc(client_count);
753 new_sock->reserved_ssap = sock->ssap;
756 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
757 skb->len - LLCP_HEADER_SIZE);
759 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
761 nfc_llcp_sock_link(&local->sockets, new_sk);
763 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
765 nfc_get_device(local->dev->idx);
767 new_sk->sk_state = LLCP_CONNECTED;
769 /* Wake the listening processes */
770 parent->sk_data_ready(parent, 0);
773 nfc_llcp_send_cc(new_sock);
775 release_sock(&sock->sk);
782 nfc_llcp_send_dm(local, dsap, ssap, reason);
788 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
791 struct nfc_llcp_local *local = sock->local;
793 pr_debug("Remote ready %d tx queue len %d remote rw %d",
794 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
797 /* Try to queue some I frames for transmission */
798 while (sock->remote_ready &&
799 skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
802 pdu = skb_dequeue(&sock->tx_queue);
806 /* Update N(S)/N(R) */
807 nfc_llcp_set_nrns(sock, pdu);
809 skb_queue_tail(&local->tx_queue, pdu);
816 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
819 struct nfc_llcp_sock *llcp_sock;
821 u8 dsap, ssap, ptype, ns, nr;
823 ptype = nfc_llcp_ptype(skb);
824 dsap = nfc_llcp_dsap(skb);
825 ssap = nfc_llcp_ssap(skb);
826 ns = nfc_llcp_ns(skb);
827 nr = nfc_llcp_nr(skb);
829 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
831 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
832 if (llcp_sock == NULL) {
833 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
839 if (sk->sk_state == LLCP_CLOSED) {
841 nfc_llcp_sock_put(llcp_sock);
844 /* Pass the payload upstream */
845 if (ptype == LLCP_PDU_I) {
846 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
848 if (ns == llcp_sock->recv_n)
849 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
851 pr_err("Received out of sequence I PDU\n");
853 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
854 if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
855 pr_err("receive queue is full\n");
856 skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
860 /* Remove skbs from the pending queue */
861 if (llcp_sock->send_ack_n != nr) {
862 struct sk_buff *s, *tmp;
864 llcp_sock->send_ack_n = nr;
866 /* Remove and free all skbs until ns == nr */
867 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
868 skb_unlink(s, &llcp_sock->tx_pending_queue);
871 if (nfc_llcp_ns(s) == nr)
875 /* Re-queue the remaining skbs for transmission */
876 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
878 skb_unlink(s, &llcp_sock->tx_pending_queue);
879 skb_queue_head(&local->tx_queue, s);
883 if (ptype == LLCP_PDU_RR)
884 llcp_sock->remote_ready = true;
885 else if (ptype == LLCP_PDU_RNR)
886 llcp_sock->remote_ready = false;
888 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
889 nfc_llcp_send_rr(llcp_sock);
892 nfc_llcp_sock_put(llcp_sock);
895 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
898 struct nfc_llcp_sock *llcp_sock;
902 dsap = nfc_llcp_dsap(skb);
903 ssap = nfc_llcp_ssap(skb);
905 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
906 if (llcp_sock == NULL) {
907 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
913 if (sk->sk_state == LLCP_CLOSED) {
915 nfc_llcp_sock_put(llcp_sock);
918 if (sk->sk_state == LLCP_CONNECTED) {
919 nfc_put_device(local->dev);
920 sk->sk_state = LLCP_CLOSED;
921 sk->sk_state_change(sk);
924 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
927 nfc_llcp_sock_put(llcp_sock);
930 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
932 struct nfc_llcp_sock *llcp_sock;
936 dsap = nfc_llcp_dsap(skb);
937 ssap = nfc_llcp_ssap(skb);
939 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
940 if (llcp_sock == NULL) {
941 pr_err("Invalid CC\n");
942 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
949 /* Unlink from connecting and link to the client array */
950 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
951 nfc_llcp_sock_link(&local->sockets, sk);
952 llcp_sock->dsap = ssap;
954 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
955 skb->len - LLCP_HEADER_SIZE);
957 sk->sk_state = LLCP_CONNECTED;
958 sk->sk_state_change(sk);
960 nfc_llcp_sock_put(llcp_sock);
963 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
965 struct nfc_llcp_sock *llcp_sock;
967 u8 dsap, ssap, reason;
969 dsap = nfc_llcp_dsap(skb);
970 ssap = nfc_llcp_ssap(skb);
971 reason = skb->data[2];
973 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
976 case LLCP_DM_NOBOUND:
978 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
982 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
986 if (llcp_sock == NULL) {
987 pr_err("Invalid DM\n");
994 sk->sk_state = LLCP_CLOSED;
995 sk->sk_state_change(sk);
997 nfc_llcp_sock_put(llcp_sock);
1002 static void nfc_llcp_rx_work(struct work_struct *work)
1004 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1006 u8 dsap, ssap, ptype;
1007 struct sk_buff *skb;
1009 skb = local->rx_pending;
1011 pr_debug("No pending SKB\n");
1015 ptype = nfc_llcp_ptype(skb);
1016 dsap = nfc_llcp_dsap(skb);
1017 ssap = nfc_llcp_ssap(skb);
1019 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1021 if (ptype != LLCP_PDU_SYMM)
1022 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1023 16, 1, skb->data, skb->len, true);
1030 case LLCP_PDU_CONNECT:
1031 pr_debug("CONNECT\n");
1032 nfc_llcp_recv_connect(local, skb);
1037 nfc_llcp_recv_disc(local, skb);
1042 nfc_llcp_recv_cc(local, skb);
1047 nfc_llcp_recv_dm(local, skb);
1053 pr_debug("I frame\n");
1054 nfc_llcp_recv_hdlc(local, skb);
1059 queue_work(system_nrt_wq, &local->tx_work);
1060 kfree_skb(local->rx_pending);
1061 local->rx_pending = NULL;
1066 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1068 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1070 pr_debug("Received an LLCP PDU\n");
1072 pr_err("err %d\n", err);
1076 local->rx_pending = skb_get(skb);
1077 del_timer(&local->link_timer);
1078 queue_work(system_nrt_wq, &local->rx_work);
1083 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1085 struct nfc_llcp_local *local;
1087 local = nfc_llcp_find_local(dev);
1091 local->rx_pending = skb_get(skb);
1092 del_timer(&local->link_timer);
1093 queue_work(system_nrt_wq, &local->rx_work);
1098 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1100 struct nfc_llcp_local *local;
1102 local = nfc_llcp_find_local(dev);
1106 /* Close and purge all existing sockets */
1107 nfc_llcp_socket_release(local, true);
1110 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1111 u8 comm_mode, u8 rf_mode)
1113 struct nfc_llcp_local *local;
1115 pr_debug("rf mode %d\n", rf_mode);
1117 local = nfc_llcp_find_local(dev);
1121 local->target_idx = target_idx;
1122 local->comm_mode = comm_mode;
1123 local->rf_mode = rf_mode;
1125 if (rf_mode == NFC_RF_INITIATOR) {
1126 pr_debug("Queueing Tx work\n");
1128 queue_work(system_nrt_wq, &local->tx_work);
1130 mod_timer(&local->link_timer,
1131 jiffies + msecs_to_jiffies(local->remote_lto));
1135 int nfc_llcp_register_device(struct nfc_dev *ndev)
1137 struct nfc_llcp_local *local;
1139 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1144 INIT_LIST_HEAD(&local->list);
1145 kref_init(&local->ref);
1146 mutex_init(&local->sdp_lock);
1147 init_timer(&local->link_timer);
1148 local->link_timer.data = (unsigned long) local;
1149 local->link_timer.function = nfc_llcp_symm_timer;
1151 skb_queue_head_init(&local->tx_queue);
1152 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1154 local->rx_pending = NULL;
1155 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1157 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1159 local->sockets.lock = __RW_LOCK_UNLOCKED(local->sockets.lock);
1160 local->connecting_sockets.lock = __RW_LOCK_UNLOCKED(local->connecting_sockets.lock);
1162 nfc_llcp_build_gb(local);
1164 local->remote_miu = LLCP_DEFAULT_MIU;
1165 local->remote_lto = LLCP_DEFAULT_LTO;
1167 list_add(&llcp_devices, &local->list);
1172 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1174 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1176 if (local == NULL) {
1177 pr_debug("No such device\n");
1181 nfc_llcp_local_put(local);
1184 int __init nfc_llcp_init(void)
1186 INIT_LIST_HEAD(&llcp_devices);
1188 return nfc_llcp_sock_init();
1191 void nfc_llcp_exit(void)
1193 nfc_llcp_sock_exit();