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_purge(struct nfc_llcp_sock *sock)
50 struct nfc_llcp_local *local = sock->local;
51 struct sk_buff *s, *tmp;
53 pr_debug("%p\n", &sock->sk);
55 skb_queue_purge(&sock->tx_queue);
56 skb_queue_purge(&sock->tx_pending_queue);
61 /* Search for local pending SKBs that are related to this socket */
62 skb_queue_walk_safe(&local->tx_queue, s, tmp) {
63 if (s->sk != &sock->sk)
66 skb_unlink(s, &local->tx_queue);
71 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen,
75 struct hlist_node *tmp;
76 struct nfc_llcp_sock *llcp_sock;
78 skb_queue_purge(&local->tx_queue);
80 write_lock(&local->sockets.lock);
82 sk_for_each_safe(sk, tmp, &local->sockets.head) {
83 llcp_sock = nfc_llcp_sock(sk);
87 nfc_llcp_socket_purge(llcp_sock);
89 if (sk->sk_state == LLCP_CONNECTED)
90 nfc_put_device(llcp_sock->dev);
92 if (sk->sk_state == LLCP_LISTEN) {
93 struct nfc_llcp_sock *lsk, *n;
94 struct sock *accept_sk;
96 list_for_each_entry_safe(lsk, n,
97 &llcp_sock->accept_queue,
100 bh_lock_sock(accept_sk);
102 nfc_llcp_accept_unlink(accept_sk);
105 accept_sk->sk_err = err;
106 accept_sk->sk_state = LLCP_CLOSED;
107 accept_sk->sk_state_change(sk);
109 bh_unlock_sock(accept_sk);
111 sock_orphan(accept_sk);
114 if (listen == true) {
121 * If we have a connection less socket bound, we keep it alive
122 * if the device is still present.
124 if (sk->sk_state == LLCP_BOUND && sk->sk_type == SOCK_DGRAM &&
132 sk->sk_state = LLCP_CLOSED;
133 sk->sk_state_change(sk);
139 sk_del_node_init(sk);
142 write_unlock(&local->sockets.lock);
145 * If we want to keep the listening sockets alive,
146 * we don't touch the RAW ones.
151 write_lock(&local->raw_sockets.lock);
153 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
154 llcp_sock = nfc_llcp_sock(sk);
158 nfc_llcp_socket_purge(llcp_sock);
162 sk->sk_state = LLCP_CLOSED;
163 sk->sk_state_change(sk);
169 sk_del_node_init(sk);
172 write_unlock(&local->raw_sockets.lock);
175 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
177 kref_get(&local->ref);
182 static void local_cleanup(struct nfc_llcp_local *local, bool listen)
184 nfc_llcp_socket_release(local, listen, ENXIO);
185 del_timer_sync(&local->link_timer);
186 skb_queue_purge(&local->tx_queue);
187 cancel_work_sync(&local->tx_work);
188 cancel_work_sync(&local->rx_work);
189 cancel_work_sync(&local->timeout_work);
190 kfree_skb(local->rx_pending);
193 static void local_release(struct kref *ref)
195 struct nfc_llcp_local *local;
197 local = container_of(ref, struct nfc_llcp_local, ref);
199 list_del(&local->list);
200 local_cleanup(local, false);
204 int nfc_llcp_local_put(struct nfc_llcp_local *local)
209 return kref_put(&local->ref, local_release);
212 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
216 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
218 pr_debug("ssap dsap %d %d\n", ssap, dsap);
220 if (ssap == 0 && dsap == 0)
223 read_lock(&local->sockets.lock);
227 sk_for_each(sk, &local->sockets.head) {
228 tmp_sock = nfc_llcp_sock(sk);
230 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
231 llcp_sock = tmp_sock;
236 read_unlock(&local->sockets.lock);
238 if (llcp_sock == NULL)
241 sock_hold(&llcp_sock->sk);
246 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
251 static void nfc_llcp_timeout_work(struct work_struct *work)
253 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
256 nfc_dep_link_down(local->dev);
259 static void nfc_llcp_symm_timer(unsigned long data)
261 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
263 pr_err("SYMM timeout\n");
265 schedule_work(&local->timeout_work);
268 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
270 struct nfc_llcp_local *local, *n;
272 list_for_each_entry_safe(local, n, &llcp_devices, list)
273 if (local->dev == dev)
276 pr_debug("No device found\n");
281 static char *wks[] = {
289 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
293 pr_debug("%s\n", service_name);
295 if (service_name == NULL)
298 num_wks = ARRAY_SIZE(wks);
300 for (sap = 0; sap < num_wks; sap++) {
301 if (wks[sap] == NULL)
304 if (strncmp(wks[sap], service_name, service_name_len) == 0)
312 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
313 u8 *sn, size_t sn_len)
316 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
318 pr_debug("sn %zd %p\n", sn_len, sn);
320 if (sn == NULL || sn_len == 0)
323 read_lock(&local->sockets.lock);
327 sk_for_each(sk, &local->sockets.head) {
328 tmp_sock = nfc_llcp_sock(sk);
330 pr_debug("llcp sock %p\n", tmp_sock);
332 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
333 tmp_sock->sk.sk_state != LLCP_LISTEN)
336 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
337 tmp_sock->sk.sk_state != LLCP_BOUND)
340 if (tmp_sock->service_name == NULL ||
341 tmp_sock->service_name_len == 0)
344 if (tmp_sock->service_name_len != sn_len)
347 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
348 llcp_sock = tmp_sock;
353 read_unlock(&local->sockets.lock);
355 pr_debug("Found llcp sock %p\n", llcp_sock);
360 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
361 struct nfc_llcp_sock *sock)
363 mutex_lock(&local->sdp_lock);
365 if (sock->service_name != NULL && sock->service_name_len > 0) {
366 int ssap = nfc_llcp_wks_sap(sock->service_name,
367 sock->service_name_len);
370 pr_debug("WKS %d\n", ssap);
372 /* This is a WKS, let's check if it's free */
373 if (local->local_wks & BIT(ssap)) {
374 mutex_unlock(&local->sdp_lock);
379 set_bit(ssap, &local->local_wks);
380 mutex_unlock(&local->sdp_lock);
386 * Check if there already is a non WKS socket bound
387 * to this service name.
389 if (nfc_llcp_sock_from_sn(local, sock->service_name,
390 sock->service_name_len) != NULL) {
391 mutex_unlock(&local->sdp_lock);
396 mutex_unlock(&local->sdp_lock);
398 return LLCP_SDP_UNBOUND;
400 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
401 if (!test_bit(sock->ssap, &local->local_wks)) {
402 set_bit(sock->ssap, &local->local_wks);
403 mutex_unlock(&local->sdp_lock);
409 mutex_unlock(&local->sdp_lock);
414 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
418 mutex_lock(&local->sdp_lock);
420 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
421 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
422 mutex_unlock(&local->sdp_lock);
426 set_bit(local_ssap, &local->local_sap);
428 mutex_unlock(&local->sdp_lock);
430 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
433 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
438 if (ssap < LLCP_WKS_NUM_SAP) {
440 sdp = &local->local_wks;
441 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
442 atomic_t *client_cnt;
444 local_ssap = ssap - LLCP_WKS_NUM_SAP;
445 sdp = &local->local_sdp;
446 client_cnt = &local->local_sdp_cnt[local_ssap];
448 pr_debug("%d clients\n", atomic_read(client_cnt));
450 mutex_lock(&local->sdp_lock);
452 if (atomic_dec_and_test(client_cnt)) {
453 struct nfc_llcp_sock *l_sock;
455 pr_debug("No more clients for SAP %d\n", ssap);
457 clear_bit(local_ssap, sdp);
459 /* Find the listening sock and set it back to UNBOUND */
460 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
462 l_sock->ssap = LLCP_SDP_UNBOUND;
463 nfc_llcp_sock_put(l_sock);
467 mutex_unlock(&local->sdp_lock);
470 } else if (ssap < LLCP_MAX_SAP) {
471 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
472 sdp = &local->local_sap;
477 mutex_lock(&local->sdp_lock);
479 clear_bit(local_ssap, sdp);
481 mutex_unlock(&local->sdp_lock);
484 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
488 mutex_lock(&local->sdp_lock);
490 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
491 if (ssap == LLCP_SDP_NUM_SAP) {
492 mutex_unlock(&local->sdp_lock);
497 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
499 set_bit(ssap, &local->local_sdp);
501 mutex_unlock(&local->sdp_lock);
503 return LLCP_WKS_NUM_SAP + ssap;
506 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
508 u8 *gb_cur, *version_tlv, version, version_length;
509 u8 *lto_tlv, lto_length;
510 u8 *wks_tlv, wks_length;
511 u8 *miux_tlv, miux_length;
515 version = LLCP_VERSION_11;
516 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
518 gb_len += version_length;
520 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length);
521 gb_len += lto_length;
523 pr_debug("Local wks 0x%lx\n", local->local_wks);
524 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
526 gb_len += wks_length;
528 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
530 gb_len += miux_length;
532 gb_len += ARRAY_SIZE(llcp_magic);
534 if (gb_len > NFC_MAX_GT_LEN) {
541 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
542 gb_cur += ARRAY_SIZE(llcp_magic);
544 memcpy(gb_cur, version_tlv, version_length);
545 gb_cur += version_length;
547 memcpy(gb_cur, lto_tlv, lto_length);
548 gb_cur += lto_length;
550 memcpy(gb_cur, wks_tlv, wks_length);
551 gb_cur += wks_length;
553 memcpy(gb_cur, miux_tlv, miux_length);
554 gb_cur += miux_length;
556 local->gb_len = gb_len;
567 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
569 struct nfc_llcp_local *local;
571 local = nfc_llcp_find_local(dev);
573 *general_bytes_len = 0;
577 nfc_llcp_build_gb(local);
579 *general_bytes_len = local->gb_len;
584 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
586 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
589 pr_err("No LLCP device\n");
595 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
596 memcpy(local->remote_gb, gb, gb_len);
597 local->remote_gb_len = gb_len;
599 if (memcmp(local->remote_gb, llcp_magic, 3)) {
600 pr_err("MAC does not support LLCP\n");
604 return nfc_llcp_parse_gb_tlv(local,
605 &local->remote_gb[3],
606 local->remote_gb_len - 3);
609 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
611 return (pdu->data[0] & 0xfc) >> 2;
614 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
616 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
619 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
621 return pdu->data[1] & 0x3f;
624 static u8 nfc_llcp_ns(struct sk_buff *pdu)
626 return pdu->data[2] >> 4;
629 static u8 nfc_llcp_nr(struct sk_buff *pdu)
631 return pdu->data[2] & 0xf;
634 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
636 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
637 sock->send_n = (sock->send_n + 1) % 16;
638 sock->recv_ack_n = (sock->recv_n - 1) % 16;
641 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
642 struct sk_buff *skb, u8 direction)
644 struct sk_buff *skb_copy = NULL, *nskb;
648 read_lock(&local->raw_sockets.lock);
650 sk_for_each(sk, &local->raw_sockets.head) {
651 if (sk->sk_state != LLCP_BOUND)
654 if (skb_copy == NULL) {
655 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
658 if (skb_copy == NULL)
661 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
663 data[0] = local->dev ? local->dev->idx : 0xFF;
667 nskb = skb_clone(skb_copy, GFP_ATOMIC);
671 if (sock_queue_rcv_skb(sk, nskb))
675 read_unlock(&local->raw_sockets.lock);
680 static void nfc_llcp_tx_work(struct work_struct *work)
682 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
686 struct nfc_llcp_sock *llcp_sock;
688 skb = skb_dequeue(&local->tx_queue);
691 llcp_sock = nfc_llcp_sock(sk);
693 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
694 nfc_llcp_send_symm(local->dev);
696 struct sk_buff *copy_skb = NULL;
697 u8 ptype = nfc_llcp_ptype(skb);
700 pr_debug("Sending pending skb\n");
701 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
702 DUMP_PREFIX_OFFSET, 16, 1,
703 skb->data, skb->len, true);
705 if (ptype == LLCP_PDU_I)
706 copy_skb = skb_copy(skb, GFP_ATOMIC);
708 __net_timestamp(skb);
710 nfc_llcp_send_to_raw_sock(local, skb,
711 NFC_LLCP_DIRECTION_TX);
713 ret = nfc_data_exchange(local->dev, local->target_idx,
714 skb, nfc_llcp_recv, local);
721 if (ptype == LLCP_PDU_I && copy_skb)
722 skb_queue_tail(&llcp_sock->tx_pending_queue,
726 nfc_llcp_send_symm(local->dev);
730 mod_timer(&local->link_timer,
731 jiffies + msecs_to_jiffies(2 * local->remote_lto));
734 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
738 struct nfc_llcp_sock *llcp_sock;
740 read_lock(&local->connecting_sockets.lock);
742 sk_for_each(sk, &local->connecting_sockets.head) {
743 llcp_sock = nfc_llcp_sock(sk);
745 if (llcp_sock->ssap == ssap) {
746 sock_hold(&llcp_sock->sk);
754 read_unlock(&local->connecting_sockets.lock);
759 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
760 u8 *sn, size_t sn_len)
762 struct nfc_llcp_sock *llcp_sock;
764 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
766 if (llcp_sock == NULL)
769 sock_hold(&llcp_sock->sk);
774 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
776 u8 *tlv = &skb->data[2], type, length;
777 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
779 while (offset < tlv_array_len) {
783 pr_debug("type 0x%x length %d\n", type, length);
785 if (type == LLCP_TLV_SN) {
790 offset += length + 2;
797 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
800 struct nfc_llcp_sock *llcp_sock;
801 struct nfc_llcp_ui_cb *ui_cb;
804 dsap = nfc_llcp_dsap(skb);
805 ssap = nfc_llcp_ssap(skb);
807 ui_cb = nfc_llcp_ui_skb_cb(skb);
811 printk("%s %d %d\n", __func__, dsap, ssap);
813 pr_debug("%d %d\n", dsap, ssap);
815 /* We're looking for a bound socket, not a client one */
816 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
817 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
820 /* There is no sequence with UI frames */
821 skb_pull(skb, LLCP_HEADER_SIZE);
822 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
824 * UI frames will be freed from the socket layer, so we
825 * need to keep them alive until someone receives them.
829 pr_err("Receive queue is full\n");
833 nfc_llcp_sock_put(llcp_sock);
836 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
839 struct sock *new_sk, *parent;
840 struct nfc_llcp_sock *sock, *new_sock;
841 u8 dsap, ssap, reason;
843 dsap = nfc_llcp_dsap(skb);
844 ssap = nfc_llcp_ssap(skb);
846 pr_debug("%d %d\n", dsap, ssap);
848 if (dsap != LLCP_SAP_SDP) {
849 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
850 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
851 reason = LLCP_DM_NOBOUND;
858 sn = nfc_llcp_connect_sn(skb, &sn_len);
860 reason = LLCP_DM_NOBOUND;
864 pr_debug("Service name length %zu\n", sn_len);
866 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
868 reason = LLCP_DM_NOBOUND;
873 lock_sock(&sock->sk);
877 if (sk_acceptq_is_full(parent)) {
878 reason = LLCP_DM_REJ;
879 release_sock(&sock->sk);
884 if (sock->ssap == LLCP_SDP_UNBOUND) {
885 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
887 pr_debug("First client, reserving %d\n", ssap);
889 if (ssap == LLCP_SAP_MAX) {
890 reason = LLCP_DM_REJ;
891 release_sock(&sock->sk);
899 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
900 if (new_sk == NULL) {
901 reason = LLCP_DM_REJ;
902 release_sock(&sock->sk);
907 new_sock = nfc_llcp_sock(new_sk);
908 new_sock->dev = local->dev;
909 new_sock->local = nfc_llcp_local_get(local);
910 new_sock->miu = local->remote_miu;
911 new_sock->nfc_protocol = sock->nfc_protocol;
912 new_sock->dsap = ssap;
913 new_sock->target_idx = local->target_idx;
914 new_sock->parent = parent;
915 new_sock->ssap = sock->ssap;
916 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
917 atomic_t *client_count;
919 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
922 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
924 atomic_inc(client_count);
925 new_sock->reserved_ssap = sock->ssap;
928 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
929 skb->len - LLCP_HEADER_SIZE);
931 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
933 nfc_llcp_sock_link(&local->sockets, new_sk);
935 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
937 nfc_get_device(local->dev->idx);
939 new_sk->sk_state = LLCP_CONNECTED;
941 /* Wake the listening processes */
942 parent->sk_data_ready(parent, 0);
945 nfc_llcp_send_cc(new_sock);
947 release_sock(&sock->sk);
954 nfc_llcp_send_dm(local, dsap, ssap, reason);
957 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
960 struct nfc_llcp_local *local = sock->local;
962 pr_debug("Remote ready %d tx queue len %d remote rw %d",
963 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
966 /* Try to queue some I frames for transmission */
967 while (sock->remote_ready &&
968 skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
971 pdu = skb_dequeue(&sock->tx_queue);
975 /* Update N(S)/N(R) */
976 nfc_llcp_set_nrns(sock, pdu);
978 skb_queue_tail(&local->tx_queue, pdu);
985 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
988 struct nfc_llcp_sock *llcp_sock;
990 u8 dsap, ssap, ptype, ns, nr;
992 ptype = nfc_llcp_ptype(skb);
993 dsap = nfc_llcp_dsap(skb);
994 ssap = nfc_llcp_ssap(skb);
995 ns = nfc_llcp_ns(skb);
996 nr = nfc_llcp_nr(skb);
998 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1000 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1001 if (llcp_sock == NULL) {
1002 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1006 sk = &llcp_sock->sk;
1008 if (sk->sk_state == LLCP_CLOSED) {
1010 nfc_llcp_sock_put(llcp_sock);
1013 /* Pass the payload upstream */
1014 if (ptype == LLCP_PDU_I) {
1015 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1017 if (ns == llcp_sock->recv_n)
1018 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1020 pr_err("Received out of sequence I PDU\n");
1022 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1023 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1025 * I frames will be freed from the socket layer, so we
1026 * need to keep them alive until someone receives them.
1030 pr_err("Receive queue is full\n");
1035 /* Remove skbs from the pending queue */
1036 if (llcp_sock->send_ack_n != nr) {
1037 struct sk_buff *s, *tmp;
1040 llcp_sock->send_ack_n = nr;
1042 /* Remove and free all skbs until ns == nr */
1043 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1046 skb_unlink(s, &llcp_sock->tx_pending_queue);
1053 /* Re-queue the remaining skbs for transmission */
1054 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1056 skb_unlink(s, &llcp_sock->tx_pending_queue);
1057 skb_queue_head(&local->tx_queue, s);
1061 if (ptype == LLCP_PDU_RR)
1062 llcp_sock->remote_ready = true;
1063 else if (ptype == LLCP_PDU_RNR)
1064 llcp_sock->remote_ready = false;
1066 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1067 nfc_llcp_send_rr(llcp_sock);
1070 nfc_llcp_sock_put(llcp_sock);
1073 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1074 struct sk_buff *skb)
1076 struct nfc_llcp_sock *llcp_sock;
1080 dsap = nfc_llcp_dsap(skb);
1081 ssap = nfc_llcp_ssap(skb);
1083 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1084 if (llcp_sock == NULL) {
1085 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1089 sk = &llcp_sock->sk;
1092 nfc_llcp_socket_purge(llcp_sock);
1094 if (sk->sk_state == LLCP_CLOSED) {
1096 nfc_llcp_sock_put(llcp_sock);
1099 if (sk->sk_state == LLCP_CONNECTED) {
1100 nfc_put_device(local->dev);
1101 sk->sk_state = LLCP_CLOSED;
1102 sk->sk_state_change(sk);
1105 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1108 nfc_llcp_sock_put(llcp_sock);
1111 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1113 struct nfc_llcp_sock *llcp_sock;
1117 dsap = nfc_llcp_dsap(skb);
1118 ssap = nfc_llcp_ssap(skb);
1120 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1121 if (llcp_sock == NULL) {
1122 pr_err("Invalid CC\n");
1123 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1128 sk = &llcp_sock->sk;
1130 /* Unlink from connecting and link to the client array */
1131 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1132 nfc_llcp_sock_link(&local->sockets, sk);
1133 llcp_sock->dsap = ssap;
1135 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1136 skb->len - LLCP_HEADER_SIZE);
1138 sk->sk_state = LLCP_CONNECTED;
1139 sk->sk_state_change(sk);
1141 nfc_llcp_sock_put(llcp_sock);
1144 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1146 struct nfc_llcp_sock *llcp_sock;
1148 u8 dsap, ssap, reason;
1150 dsap = nfc_llcp_dsap(skb);
1151 ssap = nfc_llcp_ssap(skb);
1152 reason = skb->data[2];
1154 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1157 case LLCP_DM_NOBOUND:
1159 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1163 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1167 if (llcp_sock == NULL) {
1168 pr_debug("Already closed\n");
1172 sk = &llcp_sock->sk;
1175 sk->sk_state = LLCP_CLOSED;
1176 sk->sk_state_change(sk);
1178 nfc_llcp_sock_put(llcp_sock);
1181 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1182 struct sk_buff *skb)
1184 struct nfc_llcp_sock *llcp_sock;
1185 u8 dsap, ssap, *tlv, type, length, tid, sap;
1186 u16 tlv_len, offset;
1188 size_t service_name_len;
1190 dsap = nfc_llcp_dsap(skb);
1191 ssap = nfc_llcp_ssap(skb);
1193 pr_debug("%d %d\n", dsap, ssap);
1195 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1196 pr_err("Wrong SNL SAP\n");
1200 tlv = &skb->data[LLCP_HEADER_SIZE];
1201 tlv_len = skb->len - LLCP_HEADER_SIZE;
1204 while (offset < tlv_len) {
1209 case LLCP_TLV_SDREQ:
1211 service_name = (char *) &tlv[3];
1212 service_name_len = length - 1;
1214 pr_debug("Looking for %.16s\n", service_name);
1216 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1217 !strncmp(service_name, "urn:nfc:sn:sdp",
1218 service_name_len)) {
1223 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1231 * We found a socket but its ssap has not been reserved
1232 * yet. We need to assign it for good and send a reply.
1233 * The ssap will be freed when the socket is closed.
1235 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1236 atomic_t *client_count;
1238 sap = nfc_llcp_reserve_sdp_ssap(local);
1240 pr_debug("Reserving %d\n", sap);
1242 if (sap == LLCP_SAP_MAX) {
1248 &local->local_sdp_cnt[sap -
1251 atomic_inc(client_count);
1253 llcp_sock->ssap = sap;
1254 llcp_sock->reserved_ssap = sap;
1256 sap = llcp_sock->ssap;
1259 pr_debug("%p %d\n", llcp_sock, sap);
1262 nfc_llcp_send_snl(local, tid, sap);
1266 pr_err("Invalid SNL tlv value 0x%x\n", type);
1270 offset += length + 2;
1275 static void nfc_llcp_rx_work(struct work_struct *work)
1277 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1279 u8 dsap, ssap, ptype;
1280 struct sk_buff *skb;
1282 skb = local->rx_pending;
1284 pr_debug("No pending SKB\n");
1288 ptype = nfc_llcp_ptype(skb);
1289 dsap = nfc_llcp_dsap(skb);
1290 ssap = nfc_llcp_ssap(skb);
1292 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1294 if (ptype != LLCP_PDU_SYMM)
1295 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1296 16, 1, skb->data, skb->len, true);
1298 __net_timestamp(skb);
1300 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1309 nfc_llcp_recv_ui(local, skb);
1312 case LLCP_PDU_CONNECT:
1313 pr_debug("CONNECT\n");
1314 nfc_llcp_recv_connect(local, skb);
1319 nfc_llcp_recv_disc(local, skb);
1324 nfc_llcp_recv_cc(local, skb);
1329 nfc_llcp_recv_dm(local, skb);
1334 nfc_llcp_recv_snl(local, skb);
1340 pr_debug("I frame\n");
1341 nfc_llcp_recv_hdlc(local, skb);
1346 schedule_work(&local->tx_work);
1347 kfree_skb(local->rx_pending);
1348 local->rx_pending = NULL;
1351 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1353 local->rx_pending = skb;
1354 del_timer(&local->link_timer);
1355 schedule_work(&local->rx_work);
1358 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1360 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1362 pr_debug("Received an LLCP PDU\n");
1364 pr_err("err %d\n", err);
1368 __nfc_llcp_recv(local, skb);
1371 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1373 struct nfc_llcp_local *local;
1375 local = nfc_llcp_find_local(dev);
1379 __nfc_llcp_recv(local, skb);
1384 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1386 struct nfc_llcp_local *local;
1388 local = nfc_llcp_find_local(dev);
1392 /* Close and purge all existing sockets */
1393 nfc_llcp_socket_release(local, true, 0);
1396 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1397 u8 comm_mode, u8 rf_mode)
1399 struct nfc_llcp_local *local;
1401 pr_debug("rf mode %d\n", rf_mode);
1403 local = nfc_llcp_find_local(dev);
1407 local->target_idx = target_idx;
1408 local->comm_mode = comm_mode;
1409 local->rf_mode = rf_mode;
1411 if (rf_mode == NFC_RF_INITIATOR) {
1412 pr_debug("Queueing Tx work\n");
1414 schedule_work(&local->tx_work);
1416 mod_timer(&local->link_timer,
1417 jiffies + msecs_to_jiffies(local->remote_lto));
1421 int nfc_llcp_register_device(struct nfc_dev *ndev)
1423 struct nfc_llcp_local *local;
1425 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1430 INIT_LIST_HEAD(&local->list);
1431 kref_init(&local->ref);
1432 mutex_init(&local->sdp_lock);
1433 init_timer(&local->link_timer);
1434 local->link_timer.data = (unsigned long) local;
1435 local->link_timer.function = nfc_llcp_symm_timer;
1437 skb_queue_head_init(&local->tx_queue);
1438 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1440 local->rx_pending = NULL;
1441 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1443 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1445 rwlock_init(&local->sockets.lock);
1446 rwlock_init(&local->connecting_sockets.lock);
1447 rwlock_init(&local->raw_sockets.lock);
1449 local->lto = 150; /* 1500 ms */
1450 local->rw = LLCP_MAX_RW;
1451 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1453 nfc_llcp_build_gb(local);
1455 local->remote_miu = LLCP_DEFAULT_MIU;
1456 local->remote_lto = LLCP_DEFAULT_LTO;
1458 list_add(&local->list, &llcp_devices);
1463 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1465 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1467 if (local == NULL) {
1468 pr_debug("No such device\n");
1472 local_cleanup(local, false);
1474 nfc_llcp_local_put(local);
1477 int __init nfc_llcp_init(void)
1479 INIT_LIST_HEAD(&llcp_devices);
1481 return nfc_llcp_sock_init();
1484 void nfc_llcp_exit(void)
1486 nfc_llcp_sock_exit();