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)
74 struct hlist_node *tmp;
75 struct nfc_llcp_sock *llcp_sock;
77 skb_queue_purge(&local->tx_queue);
79 write_lock(&local->sockets.lock);
81 sk_for_each_safe(sk, tmp, &local->sockets.head) {
82 llcp_sock = nfc_llcp_sock(sk);
86 nfc_llcp_socket_purge(llcp_sock);
88 if (sk->sk_state == LLCP_CONNECTED)
89 nfc_put_device(llcp_sock->dev);
91 if (sk->sk_state == LLCP_LISTEN) {
92 struct nfc_llcp_sock *lsk, *n;
93 struct sock *accept_sk;
95 list_for_each_entry_safe(lsk, n,
96 &llcp_sock->accept_queue,
99 bh_lock_sock(accept_sk);
101 nfc_llcp_accept_unlink(accept_sk);
103 accept_sk->sk_state = LLCP_CLOSED;
105 bh_unlock_sock(accept_sk);
107 sock_orphan(accept_sk);
110 if (listen == true) {
117 * If we have a connection less socket bound, we keep it alive
118 * if the device is still present.
120 if (sk->sk_state == LLCP_BOUND && sk->sk_type == SOCK_DGRAM &&
126 sk->sk_state = LLCP_CLOSED;
132 sk_del_node_init(sk);
135 write_unlock(&local->sockets.lock);
138 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
140 kref_get(&local->ref);
145 static void local_release(struct kref *ref)
147 struct nfc_llcp_local *local;
149 local = container_of(ref, struct nfc_llcp_local, ref);
151 list_del(&local->list);
152 nfc_llcp_socket_release(local, false);
153 del_timer_sync(&local->link_timer);
154 skb_queue_purge(&local->tx_queue);
155 cancel_work_sync(&local->tx_work);
156 cancel_work_sync(&local->rx_work);
157 cancel_work_sync(&local->timeout_work);
158 kfree_skb(local->rx_pending);
162 int nfc_llcp_local_put(struct nfc_llcp_local *local)
167 return kref_put(&local->ref, local_release);
170 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
174 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
176 pr_debug("ssap dsap %d %d\n", ssap, dsap);
178 if (ssap == 0 && dsap == 0)
181 read_lock(&local->sockets.lock);
185 sk_for_each(sk, &local->sockets.head) {
186 tmp_sock = nfc_llcp_sock(sk);
188 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
189 llcp_sock = tmp_sock;
194 read_unlock(&local->sockets.lock);
196 if (llcp_sock == NULL)
199 sock_hold(&llcp_sock->sk);
204 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
209 static void nfc_llcp_timeout_work(struct work_struct *work)
211 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
214 nfc_dep_link_down(local->dev);
217 static void nfc_llcp_symm_timer(unsigned long data)
219 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
221 pr_err("SYMM timeout\n");
223 schedule_work(&local->timeout_work);
226 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
228 struct nfc_llcp_local *local, *n;
230 list_for_each_entry_safe(local, n, &llcp_devices, list)
231 if (local->dev == dev)
234 pr_debug("No device found\n");
239 static char *wks[] = {
247 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
251 pr_debug("%s\n", service_name);
253 if (service_name == NULL)
256 num_wks = ARRAY_SIZE(wks);
258 for (sap = 0; sap < num_wks; sap++) {
259 if (wks[sap] == NULL)
262 if (strncmp(wks[sap], service_name, service_name_len) == 0)
270 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
271 u8 *sn, size_t sn_len)
274 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
276 pr_debug("sn %zd %p\n", sn_len, sn);
278 if (sn == NULL || sn_len == 0)
281 read_lock(&local->sockets.lock);
285 sk_for_each(sk, &local->sockets.head) {
286 tmp_sock = nfc_llcp_sock(sk);
288 pr_debug("llcp sock %p\n", tmp_sock);
290 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
291 tmp_sock->sk.sk_state != LLCP_LISTEN)
294 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
295 tmp_sock->sk.sk_state != LLCP_BOUND)
298 if (tmp_sock->service_name == NULL ||
299 tmp_sock->service_name_len == 0)
302 if (tmp_sock->service_name_len != sn_len)
305 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
306 llcp_sock = tmp_sock;
311 read_unlock(&local->sockets.lock);
313 pr_debug("Found llcp sock %p\n", llcp_sock);
318 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
319 struct nfc_llcp_sock *sock)
321 mutex_lock(&local->sdp_lock);
323 if (sock->service_name != NULL && sock->service_name_len > 0) {
324 int ssap = nfc_llcp_wks_sap(sock->service_name,
325 sock->service_name_len);
328 pr_debug("WKS %d\n", ssap);
330 /* This is a WKS, let's check if it's free */
331 if (local->local_wks & BIT(ssap)) {
332 mutex_unlock(&local->sdp_lock);
337 set_bit(ssap, &local->local_wks);
338 mutex_unlock(&local->sdp_lock);
344 * Check if there already is a non WKS socket bound
345 * to this service name.
347 if (nfc_llcp_sock_from_sn(local, sock->service_name,
348 sock->service_name_len) != NULL) {
349 mutex_unlock(&local->sdp_lock);
354 mutex_unlock(&local->sdp_lock);
356 return LLCP_SDP_UNBOUND;
358 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
359 if (!test_bit(sock->ssap, &local->local_wks)) {
360 set_bit(sock->ssap, &local->local_wks);
361 mutex_unlock(&local->sdp_lock);
367 mutex_unlock(&local->sdp_lock);
372 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
376 mutex_lock(&local->sdp_lock);
378 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
379 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
380 mutex_unlock(&local->sdp_lock);
384 set_bit(local_ssap, &local->local_sap);
386 mutex_unlock(&local->sdp_lock);
388 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
391 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
396 if (ssap < LLCP_WKS_NUM_SAP) {
398 sdp = &local->local_wks;
399 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
400 atomic_t *client_cnt;
402 local_ssap = ssap - LLCP_WKS_NUM_SAP;
403 sdp = &local->local_sdp;
404 client_cnt = &local->local_sdp_cnt[local_ssap];
406 pr_debug("%d clients\n", atomic_read(client_cnt));
408 mutex_lock(&local->sdp_lock);
410 if (atomic_dec_and_test(client_cnt)) {
411 struct nfc_llcp_sock *l_sock;
413 pr_debug("No more clients for SAP %d\n", ssap);
415 clear_bit(local_ssap, sdp);
417 /* Find the listening sock and set it back to UNBOUND */
418 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
420 l_sock->ssap = LLCP_SDP_UNBOUND;
421 nfc_llcp_sock_put(l_sock);
425 mutex_unlock(&local->sdp_lock);
428 } else if (ssap < LLCP_MAX_SAP) {
429 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
430 sdp = &local->local_sap;
435 mutex_lock(&local->sdp_lock);
437 clear_bit(local_ssap, sdp);
439 mutex_unlock(&local->sdp_lock);
442 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
446 mutex_lock(&local->sdp_lock);
448 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
449 if (ssap == LLCP_SDP_NUM_SAP) {
450 mutex_unlock(&local->sdp_lock);
455 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
457 set_bit(ssap, &local->local_sdp);
459 mutex_unlock(&local->sdp_lock);
461 return LLCP_WKS_NUM_SAP + ssap;
464 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
466 u8 *gb_cur, *version_tlv, version, version_length;
467 u8 *lto_tlv, lto_length;
468 u8 *wks_tlv, wks_length;
469 u8 *miux_tlv, miux_length;
473 version = LLCP_VERSION_11;
474 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
476 gb_len += version_length;
478 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length);
479 gb_len += lto_length;
481 pr_debug("Local wks 0x%lx\n", local->local_wks);
482 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
484 gb_len += wks_length;
486 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
488 gb_len += miux_length;
490 gb_len += ARRAY_SIZE(llcp_magic);
492 if (gb_len > NFC_MAX_GT_LEN) {
499 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
500 gb_cur += ARRAY_SIZE(llcp_magic);
502 memcpy(gb_cur, version_tlv, version_length);
503 gb_cur += version_length;
505 memcpy(gb_cur, lto_tlv, lto_length);
506 gb_cur += lto_length;
508 memcpy(gb_cur, wks_tlv, wks_length);
509 gb_cur += wks_length;
511 memcpy(gb_cur, miux_tlv, miux_length);
512 gb_cur += miux_length;
514 local->gb_len = gb_len;
525 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
527 struct nfc_llcp_local *local;
529 local = nfc_llcp_find_local(dev);
531 *general_bytes_len = 0;
535 nfc_llcp_build_gb(local);
537 *general_bytes_len = local->gb_len;
542 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
544 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
547 pr_err("No LLCP device\n");
553 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
554 memcpy(local->remote_gb, gb, gb_len);
555 local->remote_gb_len = gb_len;
557 if (memcmp(local->remote_gb, llcp_magic, 3)) {
558 pr_err("MAC does not support LLCP\n");
562 return nfc_llcp_parse_gb_tlv(local,
563 &local->remote_gb[3],
564 local->remote_gb_len - 3);
567 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
569 return (pdu->data[0] & 0xfc) >> 2;
572 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
574 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
577 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
579 return pdu->data[1] & 0x3f;
582 static u8 nfc_llcp_ns(struct sk_buff *pdu)
584 return pdu->data[2] >> 4;
587 static u8 nfc_llcp_nr(struct sk_buff *pdu)
589 return pdu->data[2] & 0xf;
592 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
594 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
595 sock->send_n = (sock->send_n + 1) % 16;
596 sock->recv_ack_n = (sock->recv_n - 1) % 16;
599 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
600 struct sk_buff *skb, u8 direction)
602 struct sk_buff *skb_copy = NULL, *nskb;
606 read_lock(&local->raw_sockets.lock);
608 sk_for_each(sk, &local->raw_sockets.head) {
609 if (sk->sk_state != LLCP_BOUND)
612 if (skb_copy == NULL) {
613 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
616 if (skb_copy == NULL)
619 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
621 data[0] = local->dev ? local->dev->idx : 0xFF;
625 nskb = skb_clone(skb_copy, GFP_ATOMIC);
629 if (sock_queue_rcv_skb(sk, nskb))
633 read_unlock(&local->raw_sockets.lock);
638 static void nfc_llcp_tx_work(struct work_struct *work)
640 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
644 struct nfc_llcp_sock *llcp_sock;
646 skb = skb_dequeue(&local->tx_queue);
649 llcp_sock = nfc_llcp_sock(sk);
651 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
652 nfc_llcp_send_symm(local->dev);
654 struct sk_buff *copy_skb = NULL;
655 u8 ptype = nfc_llcp_ptype(skb);
658 pr_debug("Sending pending skb\n");
659 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
660 DUMP_PREFIX_OFFSET, 16, 1,
661 skb->data, skb->len, true);
663 if (ptype == LLCP_PDU_I)
664 copy_skb = skb_copy(skb, GFP_ATOMIC);
666 __net_timestamp(skb);
668 nfc_llcp_send_to_raw_sock(local, skb,
669 NFC_LLCP_DIRECTION_TX);
671 ret = nfc_data_exchange(local->dev, local->target_idx,
672 skb, nfc_llcp_recv, local);
679 if (ptype == LLCP_PDU_I && copy_skb)
680 skb_queue_tail(&llcp_sock->tx_pending_queue,
684 nfc_llcp_send_symm(local->dev);
688 mod_timer(&local->link_timer,
689 jiffies + msecs_to_jiffies(2 * local->remote_lto));
692 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
696 struct nfc_llcp_sock *llcp_sock;
698 read_lock(&local->connecting_sockets.lock);
700 sk_for_each(sk, &local->connecting_sockets.head) {
701 llcp_sock = nfc_llcp_sock(sk);
703 if (llcp_sock->ssap == ssap) {
704 sock_hold(&llcp_sock->sk);
712 read_unlock(&local->connecting_sockets.lock);
717 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
718 u8 *sn, size_t sn_len)
720 struct nfc_llcp_sock *llcp_sock;
722 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
724 if (llcp_sock == NULL)
727 sock_hold(&llcp_sock->sk);
732 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
734 u8 *tlv = &skb->data[2], type, length;
735 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
737 while (offset < tlv_array_len) {
741 pr_debug("type 0x%x length %d\n", type, length);
743 if (type == LLCP_TLV_SN) {
748 offset += length + 2;
755 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
758 struct nfc_llcp_sock *llcp_sock;
759 struct nfc_llcp_ui_cb *ui_cb;
762 dsap = nfc_llcp_dsap(skb);
763 ssap = nfc_llcp_ssap(skb);
765 ui_cb = nfc_llcp_ui_skb_cb(skb);
769 printk("%s %d %d\n", __func__, dsap, ssap);
771 pr_debug("%d %d\n", dsap, ssap);
773 /* We're looking for a bound socket, not a client one */
774 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
775 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
778 /* There is no sequence with UI frames */
779 skb_pull(skb, LLCP_HEADER_SIZE);
780 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
782 * UI frames will be freed from the socket layer, so we
783 * need to keep them alive until someone receives them.
787 pr_err("Receive queue is full\n");
791 nfc_llcp_sock_put(llcp_sock);
794 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
797 struct sock *new_sk, *parent;
798 struct nfc_llcp_sock *sock, *new_sock;
799 u8 dsap, ssap, reason;
801 dsap = nfc_llcp_dsap(skb);
802 ssap = nfc_llcp_ssap(skb);
804 pr_debug("%d %d\n", dsap, ssap);
806 if (dsap != LLCP_SAP_SDP) {
807 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
808 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
809 reason = LLCP_DM_NOBOUND;
816 sn = nfc_llcp_connect_sn(skb, &sn_len);
818 reason = LLCP_DM_NOBOUND;
822 pr_debug("Service name length %zu\n", sn_len);
824 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
826 reason = LLCP_DM_NOBOUND;
831 lock_sock(&sock->sk);
835 if (sk_acceptq_is_full(parent)) {
836 reason = LLCP_DM_REJ;
837 release_sock(&sock->sk);
842 if (sock->ssap == LLCP_SDP_UNBOUND) {
843 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
845 pr_debug("First client, reserving %d\n", ssap);
847 if (ssap == LLCP_SAP_MAX) {
848 reason = LLCP_DM_REJ;
849 release_sock(&sock->sk);
857 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
858 if (new_sk == NULL) {
859 reason = LLCP_DM_REJ;
860 release_sock(&sock->sk);
865 new_sock = nfc_llcp_sock(new_sk);
866 new_sock->dev = local->dev;
867 new_sock->local = nfc_llcp_local_get(local);
868 new_sock->miu = local->remote_miu;
869 new_sock->nfc_protocol = sock->nfc_protocol;
870 new_sock->dsap = ssap;
871 new_sock->target_idx = local->target_idx;
872 new_sock->parent = parent;
873 new_sock->ssap = sock->ssap;
874 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
875 atomic_t *client_count;
877 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
880 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
882 atomic_inc(client_count);
883 new_sock->reserved_ssap = sock->ssap;
886 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
887 skb->len - LLCP_HEADER_SIZE);
889 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
891 nfc_llcp_sock_link(&local->sockets, new_sk);
893 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
895 nfc_get_device(local->dev->idx);
897 new_sk->sk_state = LLCP_CONNECTED;
899 /* Wake the listening processes */
900 parent->sk_data_ready(parent, 0);
903 nfc_llcp_send_cc(new_sock);
905 release_sock(&sock->sk);
912 nfc_llcp_send_dm(local, dsap, ssap, reason);
915 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
918 struct nfc_llcp_local *local = sock->local;
920 pr_debug("Remote ready %d tx queue len %d remote rw %d",
921 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
924 /* Try to queue some I frames for transmission */
925 while (sock->remote_ready &&
926 skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
929 pdu = skb_dequeue(&sock->tx_queue);
933 /* Update N(S)/N(R) */
934 nfc_llcp_set_nrns(sock, pdu);
936 skb_queue_tail(&local->tx_queue, pdu);
943 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
946 struct nfc_llcp_sock *llcp_sock;
948 u8 dsap, ssap, ptype, ns, nr;
950 ptype = nfc_llcp_ptype(skb);
951 dsap = nfc_llcp_dsap(skb);
952 ssap = nfc_llcp_ssap(skb);
953 ns = nfc_llcp_ns(skb);
954 nr = nfc_llcp_nr(skb);
956 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
958 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
959 if (llcp_sock == NULL) {
960 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
966 if (sk->sk_state == LLCP_CLOSED) {
968 nfc_llcp_sock_put(llcp_sock);
971 /* Pass the payload upstream */
972 if (ptype == LLCP_PDU_I) {
973 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
975 if (ns == llcp_sock->recv_n)
976 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
978 pr_err("Received out of sequence I PDU\n");
980 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
981 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
983 * I frames will be freed from the socket layer, so we
984 * need to keep them alive until someone receives them.
988 pr_err("Receive queue is full\n");
993 /* Remove skbs from the pending queue */
994 if (llcp_sock->send_ack_n != nr) {
995 struct sk_buff *s, *tmp;
998 llcp_sock->send_ack_n = nr;
1000 /* Remove and free all skbs until ns == nr */
1001 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1004 skb_unlink(s, &llcp_sock->tx_pending_queue);
1011 /* Re-queue the remaining skbs for transmission */
1012 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1014 skb_unlink(s, &llcp_sock->tx_pending_queue);
1015 skb_queue_head(&local->tx_queue, s);
1019 if (ptype == LLCP_PDU_RR)
1020 llcp_sock->remote_ready = true;
1021 else if (ptype == LLCP_PDU_RNR)
1022 llcp_sock->remote_ready = false;
1024 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1025 nfc_llcp_send_rr(llcp_sock);
1028 nfc_llcp_sock_put(llcp_sock);
1031 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1032 struct sk_buff *skb)
1034 struct nfc_llcp_sock *llcp_sock;
1038 dsap = nfc_llcp_dsap(skb);
1039 ssap = nfc_llcp_ssap(skb);
1041 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1042 if (llcp_sock == NULL) {
1043 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1047 sk = &llcp_sock->sk;
1050 nfc_llcp_socket_purge(llcp_sock);
1052 if (sk->sk_state == LLCP_CLOSED) {
1054 nfc_llcp_sock_put(llcp_sock);
1057 if (sk->sk_state == LLCP_CONNECTED) {
1058 nfc_put_device(local->dev);
1059 sk->sk_state = LLCP_CLOSED;
1060 sk->sk_state_change(sk);
1063 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1066 nfc_llcp_sock_put(llcp_sock);
1069 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1071 struct nfc_llcp_sock *llcp_sock;
1075 dsap = nfc_llcp_dsap(skb);
1076 ssap = nfc_llcp_ssap(skb);
1078 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1079 if (llcp_sock == NULL) {
1080 pr_err("Invalid CC\n");
1081 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1086 sk = &llcp_sock->sk;
1088 /* Unlink from connecting and link to the client array */
1089 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1090 nfc_llcp_sock_link(&local->sockets, sk);
1091 llcp_sock->dsap = ssap;
1093 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1094 skb->len - LLCP_HEADER_SIZE);
1096 sk->sk_state = LLCP_CONNECTED;
1097 sk->sk_state_change(sk);
1099 nfc_llcp_sock_put(llcp_sock);
1102 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1104 struct nfc_llcp_sock *llcp_sock;
1106 u8 dsap, ssap, reason;
1108 dsap = nfc_llcp_dsap(skb);
1109 ssap = nfc_llcp_ssap(skb);
1110 reason = skb->data[2];
1112 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1115 case LLCP_DM_NOBOUND:
1117 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1121 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1125 if (llcp_sock == NULL) {
1126 pr_debug("Already closed\n");
1130 sk = &llcp_sock->sk;
1133 sk->sk_state = LLCP_CLOSED;
1134 sk->sk_state_change(sk);
1136 nfc_llcp_sock_put(llcp_sock);
1139 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1140 struct sk_buff *skb)
1142 struct nfc_llcp_sock *llcp_sock;
1143 u8 dsap, ssap, *tlv, type, length, tid, sap;
1144 u16 tlv_len, offset;
1146 size_t service_name_len;
1148 dsap = nfc_llcp_dsap(skb);
1149 ssap = nfc_llcp_ssap(skb);
1151 pr_debug("%d %d\n", dsap, ssap);
1153 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1154 pr_err("Wrong SNL SAP\n");
1158 tlv = &skb->data[LLCP_HEADER_SIZE];
1159 tlv_len = skb->len - LLCP_HEADER_SIZE;
1162 while (offset < tlv_len) {
1167 case LLCP_TLV_SDREQ:
1169 service_name = (char *) &tlv[3];
1170 service_name_len = length - 1;
1172 pr_debug("Looking for %.16s\n", service_name);
1174 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1175 !strncmp(service_name, "urn:nfc:sn:sdp",
1176 service_name_len)) {
1181 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1189 * We found a socket but its ssap has not been reserved
1190 * yet. We need to assign it for good and send a reply.
1191 * The ssap will be freed when the socket is closed.
1193 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1194 atomic_t *client_count;
1196 sap = nfc_llcp_reserve_sdp_ssap(local);
1198 pr_debug("Reserving %d\n", sap);
1200 if (sap == LLCP_SAP_MAX) {
1206 &local->local_sdp_cnt[sap -
1209 atomic_inc(client_count);
1211 llcp_sock->ssap = sap;
1212 llcp_sock->reserved_ssap = sap;
1214 sap = llcp_sock->ssap;
1217 pr_debug("%p %d\n", llcp_sock, sap);
1220 nfc_llcp_send_snl(local, tid, sap);
1224 pr_err("Invalid SNL tlv value 0x%x\n", type);
1228 offset += length + 2;
1233 static void nfc_llcp_rx_work(struct work_struct *work)
1235 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1237 u8 dsap, ssap, ptype;
1238 struct sk_buff *skb;
1240 skb = local->rx_pending;
1242 pr_debug("No pending SKB\n");
1246 ptype = nfc_llcp_ptype(skb);
1247 dsap = nfc_llcp_dsap(skb);
1248 ssap = nfc_llcp_ssap(skb);
1250 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1252 if (ptype != LLCP_PDU_SYMM)
1253 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1254 16, 1, skb->data, skb->len, true);
1256 __net_timestamp(skb);
1258 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1267 nfc_llcp_recv_ui(local, skb);
1270 case LLCP_PDU_CONNECT:
1271 pr_debug("CONNECT\n");
1272 nfc_llcp_recv_connect(local, skb);
1277 nfc_llcp_recv_disc(local, skb);
1282 nfc_llcp_recv_cc(local, skb);
1287 nfc_llcp_recv_dm(local, skb);
1292 nfc_llcp_recv_snl(local, skb);
1298 pr_debug("I frame\n");
1299 nfc_llcp_recv_hdlc(local, skb);
1304 schedule_work(&local->tx_work);
1305 kfree_skb(local->rx_pending);
1306 local->rx_pending = NULL;
1309 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1311 local->rx_pending = skb;
1312 del_timer(&local->link_timer);
1313 schedule_work(&local->rx_work);
1316 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1318 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1320 pr_debug("Received an LLCP PDU\n");
1322 pr_err("err %d\n", err);
1326 __nfc_llcp_recv(local, skb);
1329 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1331 struct nfc_llcp_local *local;
1333 local = nfc_llcp_find_local(dev);
1337 __nfc_llcp_recv(local, skb);
1342 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1344 struct nfc_llcp_local *local;
1346 local = nfc_llcp_find_local(dev);
1350 /* Close and purge all existing sockets */
1351 nfc_llcp_socket_release(local, true);
1354 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1355 u8 comm_mode, u8 rf_mode)
1357 struct nfc_llcp_local *local;
1359 pr_debug("rf mode %d\n", rf_mode);
1361 local = nfc_llcp_find_local(dev);
1365 local->target_idx = target_idx;
1366 local->comm_mode = comm_mode;
1367 local->rf_mode = rf_mode;
1369 if (rf_mode == NFC_RF_INITIATOR) {
1370 pr_debug("Queueing Tx work\n");
1372 schedule_work(&local->tx_work);
1374 mod_timer(&local->link_timer,
1375 jiffies + msecs_to_jiffies(local->remote_lto));
1379 int nfc_llcp_register_device(struct nfc_dev *ndev)
1381 struct nfc_llcp_local *local;
1383 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1388 INIT_LIST_HEAD(&local->list);
1389 kref_init(&local->ref);
1390 mutex_init(&local->sdp_lock);
1391 init_timer(&local->link_timer);
1392 local->link_timer.data = (unsigned long) local;
1393 local->link_timer.function = nfc_llcp_symm_timer;
1395 skb_queue_head_init(&local->tx_queue);
1396 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1398 local->rx_pending = NULL;
1399 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1401 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1403 rwlock_init(&local->sockets.lock);
1404 rwlock_init(&local->connecting_sockets.lock);
1405 rwlock_init(&local->raw_sockets.lock);
1407 local->lto = 150; /* 1500 ms */
1408 local->rw = LLCP_MAX_RW;
1409 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1411 nfc_llcp_build_gb(local);
1413 local->remote_miu = LLCP_DEFAULT_MIU;
1414 local->remote_lto = LLCP_DEFAULT_LTO;
1416 list_add(&local->list, &llcp_devices);
1421 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1423 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1425 if (local == NULL) {
1426 pr_debug("No such device\n");
1430 nfc_llcp_local_put(local);
1433 int __init nfc_llcp_init(void)
1435 INIT_LIST_HEAD(&llcp_devices);
1437 return nfc_llcp_sock_init();
1440 void nfc_llcp_exit(void)
1442 nfc_llcp_sock_exit();