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 destroy_workqueue(local->tx_wq);
118 destroy_workqueue(local->rx_wq);
119 destroy_workqueue(local->timeout_wq);
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(local->timeout_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;
430 version = LLCP_VERSION_11;
431 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
433 gb_len += version_length;
437 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, <o, 1, <o_length);
438 gb_len += lto_length;
440 pr_debug("Local wks 0x%lx\n", local->local_wks);
441 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
443 gb_len += wks_length;
445 miux = cpu_to_be16(LLCP_MAX_MIUX);
446 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
448 gb_len += miux_length;
450 gb_len += ARRAY_SIZE(llcp_magic);
452 if (gb_len > NFC_MAX_GT_LEN) {
459 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
460 gb_cur += ARRAY_SIZE(llcp_magic);
462 memcpy(gb_cur, version_tlv, version_length);
463 gb_cur += version_length;
465 memcpy(gb_cur, lto_tlv, lto_length);
466 gb_cur += lto_length;
468 memcpy(gb_cur, wks_tlv, wks_length);
469 gb_cur += wks_length;
471 memcpy(gb_cur, miux_tlv, miux_length);
472 gb_cur += miux_length;
477 local->gb_len = gb_len;
482 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
484 struct nfc_llcp_local *local;
486 local = nfc_llcp_find_local(dev);
488 *general_bytes_len = 0;
492 nfc_llcp_build_gb(local);
494 *general_bytes_len = local->gb_len;
499 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
501 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
504 pr_err("No LLCP device\n");
508 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
509 memcpy(local->remote_gb, gb, gb_len);
510 local->remote_gb_len = gb_len;
512 if (local->remote_gb == NULL || local->remote_gb_len == 0)
515 if (memcmp(local->remote_gb, llcp_magic, 3)) {
516 pr_err("MAC does not support LLCP\n");
520 return nfc_llcp_parse_gb_tlv(local,
521 &local->remote_gb[3],
522 local->remote_gb_len - 3);
525 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
527 return (pdu->data[0] & 0xfc) >> 2;
530 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
532 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
535 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
537 return pdu->data[1] & 0x3f;
540 static u8 nfc_llcp_ns(struct sk_buff *pdu)
542 return pdu->data[2] >> 4;
545 static u8 nfc_llcp_nr(struct sk_buff *pdu)
547 return pdu->data[2] & 0xf;
550 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
552 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
553 sock->send_n = (sock->send_n + 1) % 16;
554 sock->recv_ack_n = (sock->recv_n - 1) % 16;
557 static void nfc_llcp_tx_work(struct work_struct *work)
559 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
563 struct nfc_llcp_sock *llcp_sock;
565 skb = skb_dequeue(&local->tx_queue);
568 llcp_sock = nfc_llcp_sock(sk);
569 if (llcp_sock != NULL) {
572 pr_debug("Sending pending skb\n");
573 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
574 DUMP_PREFIX_OFFSET, 16, 1,
575 skb->data, skb->len, true);
577 ret = nfc_data_exchange(local->dev, local->target_idx,
578 skb, nfc_llcp_recv, local);
580 if (!ret && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
582 skb_queue_tail(&llcp_sock->tx_pending_queue,
586 nfc_llcp_send_symm(local->dev);
589 nfc_llcp_send_symm(local->dev);
592 mod_timer(&local->link_timer,
593 jiffies + msecs_to_jiffies(2 * local->remote_lto));
596 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
600 struct nfc_llcp_sock *llcp_sock;
601 struct hlist_node *node;
603 read_lock(&local->connecting_sockets.lock);
605 sk_for_each(sk, node, &local->connecting_sockets.head) {
606 llcp_sock = nfc_llcp_sock(sk);
608 if (llcp_sock->ssap == ssap) {
609 sock_hold(&llcp_sock->sk);
617 read_unlock(&local->connecting_sockets.lock);
622 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
623 u8 *sn, size_t sn_len)
625 struct nfc_llcp_sock *llcp_sock;
627 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
629 if (llcp_sock == NULL)
632 sock_hold(&llcp_sock->sk);
637 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
639 u8 *tlv = &skb->data[2], type, length;
640 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
642 while (offset < tlv_array_len) {
646 pr_debug("type 0x%x length %d\n", type, length);
648 if (type == LLCP_TLV_SN) {
653 offset += length + 2;
660 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
663 struct sock *new_sk, *parent;
664 struct nfc_llcp_sock *sock, *new_sock;
665 u8 dsap, ssap, reason;
667 dsap = nfc_llcp_dsap(skb);
668 ssap = nfc_llcp_ssap(skb);
670 pr_debug("%d %d\n", dsap, ssap);
672 if (dsap != LLCP_SAP_SDP) {
673 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
674 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
675 reason = LLCP_DM_NOBOUND;
682 sn = nfc_llcp_connect_sn(skb, &sn_len);
684 reason = LLCP_DM_NOBOUND;
688 pr_debug("Service name length %zu\n", sn_len);
690 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
692 reason = LLCP_DM_NOBOUND;
697 lock_sock(&sock->sk);
701 if (sk_acceptq_is_full(parent)) {
702 reason = LLCP_DM_REJ;
703 release_sock(&sock->sk);
708 if (sock->ssap == LLCP_SDP_UNBOUND) {
709 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
711 pr_debug("First client, reserving %d\n", ssap);
713 if (ssap == LLCP_SAP_MAX) {
714 reason = LLCP_DM_REJ;
715 release_sock(&sock->sk);
723 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
724 if (new_sk == NULL) {
725 reason = LLCP_DM_REJ;
726 release_sock(&sock->sk);
731 new_sock = nfc_llcp_sock(new_sk);
732 new_sock->dev = local->dev;
733 new_sock->local = nfc_llcp_local_get(local);
734 new_sock->miu = local->remote_miu;
735 new_sock->nfc_protocol = sock->nfc_protocol;
736 new_sock->dsap = ssap;
737 new_sock->target_idx = local->target_idx;
738 new_sock->parent = parent;
739 new_sock->ssap = sock->ssap;
740 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
741 atomic_t *client_count;
743 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
746 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
748 atomic_inc(client_count);
749 new_sock->reserved_ssap = sock->ssap;
752 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
753 skb->len - LLCP_HEADER_SIZE);
755 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
757 nfc_llcp_sock_link(&local->sockets, new_sk);
759 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
761 nfc_get_device(local->dev->idx);
763 new_sk->sk_state = LLCP_CONNECTED;
765 /* Wake the listening processes */
766 parent->sk_data_ready(parent, 0);
769 nfc_llcp_send_cc(new_sock);
771 release_sock(&sock->sk);
778 nfc_llcp_send_dm(local, dsap, ssap, reason);
784 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
787 struct nfc_llcp_local *local = sock->local;
789 pr_debug("Remote ready %d tx queue len %d remote rw %d",
790 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
793 /* Try to queue some I frames for transmission */
794 while (sock->remote_ready &&
795 skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
798 pdu = skb_dequeue(&sock->tx_queue);
802 /* Update N(S)/N(R) */
803 nfc_llcp_set_nrns(sock, pdu);
805 skb_queue_tail(&local->tx_queue, pdu);
812 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
815 struct nfc_llcp_sock *llcp_sock;
817 u8 dsap, ssap, ptype, ns, nr;
819 ptype = nfc_llcp_ptype(skb);
820 dsap = nfc_llcp_dsap(skb);
821 ssap = nfc_llcp_ssap(skb);
822 ns = nfc_llcp_ns(skb);
823 nr = nfc_llcp_nr(skb);
825 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
827 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
828 if (llcp_sock == NULL) {
829 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
835 if (sk->sk_state == LLCP_CLOSED) {
837 nfc_llcp_sock_put(llcp_sock);
840 /* Pass the payload upstream */
841 if (ptype == LLCP_PDU_I) {
842 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
844 if (ns == llcp_sock->recv_n)
845 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
847 pr_err("Received out of sequence I PDU\n");
849 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
850 if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
851 pr_err("receive queue is full\n");
852 skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
856 /* Remove skbs from the pending queue */
857 if (llcp_sock->send_ack_n != nr) {
858 struct sk_buff *s, *tmp;
860 llcp_sock->send_ack_n = nr;
862 /* Remove and free all skbs until ns == nr */
863 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
864 skb_unlink(s, &llcp_sock->tx_pending_queue);
867 if (nfc_llcp_ns(s) == nr)
871 /* Re-queue the remaining skbs for transmission */
872 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
874 skb_unlink(s, &llcp_sock->tx_pending_queue);
875 skb_queue_head(&local->tx_queue, s);
879 if (ptype == LLCP_PDU_RR)
880 llcp_sock->remote_ready = true;
881 else if (ptype == LLCP_PDU_RNR)
882 llcp_sock->remote_ready = false;
884 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
885 nfc_llcp_send_rr(llcp_sock);
888 nfc_llcp_sock_put(llcp_sock);
891 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
894 struct nfc_llcp_sock *llcp_sock;
898 dsap = nfc_llcp_dsap(skb);
899 ssap = nfc_llcp_ssap(skb);
901 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
902 if (llcp_sock == NULL) {
903 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
909 if (sk->sk_state == LLCP_CLOSED) {
911 nfc_llcp_sock_put(llcp_sock);
914 if (sk->sk_state == LLCP_CONNECTED) {
915 nfc_put_device(local->dev);
916 sk->sk_state = LLCP_CLOSED;
917 sk->sk_state_change(sk);
920 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
923 nfc_llcp_sock_put(llcp_sock);
926 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
928 struct nfc_llcp_sock *llcp_sock;
932 dsap = nfc_llcp_dsap(skb);
933 ssap = nfc_llcp_ssap(skb);
935 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
936 if (llcp_sock == NULL) {
937 pr_err("Invalid CC\n");
938 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
945 /* Unlink from connecting and link to the client array */
946 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
947 nfc_llcp_sock_link(&local->sockets, sk);
948 llcp_sock->dsap = ssap;
950 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
951 skb->len - LLCP_HEADER_SIZE);
953 sk->sk_state = LLCP_CONNECTED;
954 sk->sk_state_change(sk);
956 nfc_llcp_sock_put(llcp_sock);
959 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
961 struct nfc_llcp_sock *llcp_sock;
963 u8 dsap, ssap, reason;
965 dsap = nfc_llcp_dsap(skb);
966 ssap = nfc_llcp_ssap(skb);
967 reason = skb->data[2];
969 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
972 case LLCP_DM_NOBOUND:
974 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
978 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
982 if (llcp_sock == NULL) {
983 pr_err("Invalid DM\n");
990 sk->sk_state = LLCP_CLOSED;
991 sk->sk_state_change(sk);
993 nfc_llcp_sock_put(llcp_sock);
998 static void nfc_llcp_rx_work(struct work_struct *work)
1000 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1002 u8 dsap, ssap, ptype;
1003 struct sk_buff *skb;
1005 skb = local->rx_pending;
1007 pr_debug("No pending SKB\n");
1011 ptype = nfc_llcp_ptype(skb);
1012 dsap = nfc_llcp_dsap(skb);
1013 ssap = nfc_llcp_ssap(skb);
1015 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1017 if (ptype != LLCP_PDU_SYMM)
1018 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1019 16, 1, skb->data, skb->len, true);
1026 case LLCP_PDU_CONNECT:
1027 pr_debug("CONNECT\n");
1028 nfc_llcp_recv_connect(local, skb);
1033 nfc_llcp_recv_disc(local, skb);
1038 nfc_llcp_recv_cc(local, skb);
1043 nfc_llcp_recv_dm(local, skb);
1049 pr_debug("I frame\n");
1050 nfc_llcp_recv_hdlc(local, skb);
1055 queue_work(local->tx_wq, &local->tx_work);
1056 kfree_skb(local->rx_pending);
1057 local->rx_pending = NULL;
1062 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1064 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1066 pr_debug("Received an LLCP PDU\n");
1068 pr_err("err %d\n", err);
1072 local->rx_pending = skb_get(skb);
1073 del_timer(&local->link_timer);
1074 queue_work(local->rx_wq, &local->rx_work);
1079 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1081 struct nfc_llcp_local *local;
1083 local = nfc_llcp_find_local(dev);
1087 local->rx_pending = skb_get(skb);
1088 del_timer(&local->link_timer);
1089 queue_work(local->rx_wq, &local->rx_work);
1094 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1096 struct nfc_llcp_local *local;
1098 local = nfc_llcp_find_local(dev);
1102 /* Close and purge all existing sockets */
1103 nfc_llcp_socket_release(local, true);
1106 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1107 u8 comm_mode, u8 rf_mode)
1109 struct nfc_llcp_local *local;
1111 pr_debug("rf mode %d\n", rf_mode);
1113 local = nfc_llcp_find_local(dev);
1117 local->target_idx = target_idx;
1118 local->comm_mode = comm_mode;
1119 local->rf_mode = rf_mode;
1121 if (rf_mode == NFC_RF_INITIATOR) {
1122 pr_debug("Queueing Tx work\n");
1124 queue_work(local->tx_wq, &local->tx_work);
1126 mod_timer(&local->link_timer,
1127 jiffies + msecs_to_jiffies(local->remote_lto));
1131 int nfc_llcp_register_device(struct nfc_dev *ndev)
1133 struct device *dev = &ndev->dev;
1134 struct nfc_llcp_local *local;
1138 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1143 INIT_LIST_HEAD(&local->list);
1144 kref_init(&local->ref);
1145 mutex_init(&local->sdp_lock);
1146 init_timer(&local->link_timer);
1147 local->link_timer.data = (unsigned long) local;
1148 local->link_timer.function = nfc_llcp_symm_timer;
1150 skb_queue_head_init(&local->tx_queue);
1151 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1152 snprintf(name, sizeof(name), "%s_llcp_tx_wq", dev_name(dev));
1154 alloc_workqueue(name,
1155 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
1157 if (local->tx_wq == NULL) {
1162 local->rx_pending = NULL;
1163 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1164 snprintf(name, sizeof(name), "%s_llcp_rx_wq", dev_name(dev));
1166 alloc_workqueue(name,
1167 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
1169 if (local->rx_wq == NULL) {
1174 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1175 snprintf(name, sizeof(name), "%s_llcp_timeout_wq", dev_name(dev));
1177 alloc_workqueue(name,
1178 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
1180 if (local->timeout_wq == NULL) {
1185 local->sockets.lock = __RW_LOCK_UNLOCKED(local->sockets.lock);
1186 local->connecting_sockets.lock = __RW_LOCK_UNLOCKED(local->connecting_sockets.lock);
1188 nfc_llcp_build_gb(local);
1190 local->remote_miu = LLCP_DEFAULT_MIU;
1191 local->remote_lto = LLCP_DEFAULT_LTO;
1193 list_add(&llcp_devices, &local->list);
1198 destroy_workqueue(local->rx_wq);
1201 destroy_workqueue(local->tx_wq);
1209 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1211 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1213 if (local == NULL) {
1214 pr_debug("No such device\n");
1218 nfc_llcp_local_put(local);
1221 int __init nfc_llcp_init(void)
1223 INIT_LIST_HEAD(&llcp_devices);
1225 return nfc_llcp_sock_init();
1228 void nfc_llcp_exit(void)
1230 nfc_llcp_sock_exit();