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 *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, node, 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 hlist_node *node;
175 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
177 pr_debug("ssap dsap %d %d\n", ssap, dsap);
179 if (ssap == 0 && dsap == 0)
182 read_lock(&local->sockets.lock);
186 sk_for_each(sk, node, &local->sockets.head) {
187 tmp_sock = nfc_llcp_sock(sk);
189 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
190 llcp_sock = tmp_sock;
195 read_unlock(&local->sockets.lock);
197 if (llcp_sock == NULL)
200 sock_hold(&llcp_sock->sk);
205 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
210 static void nfc_llcp_timeout_work(struct work_struct *work)
212 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
215 nfc_dep_link_down(local->dev);
218 static void nfc_llcp_symm_timer(unsigned long data)
220 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
222 pr_err("SYMM timeout\n");
224 schedule_work(&local->timeout_work);
227 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
229 struct nfc_llcp_local *local, *n;
231 list_for_each_entry_safe(local, n, &llcp_devices, list)
232 if (local->dev == dev)
235 pr_debug("No device found\n");
240 static char *wks[] = {
248 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
252 pr_debug("%s\n", service_name);
254 if (service_name == NULL)
257 num_wks = ARRAY_SIZE(wks);
259 for (sap = 0; sap < num_wks; sap++) {
260 if (wks[sap] == NULL)
263 if (strncmp(wks[sap], service_name, service_name_len) == 0)
271 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
272 u8 *sn, size_t sn_len)
275 struct hlist_node *node;
276 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
278 pr_debug("sn %zd %p\n", sn_len, sn);
280 if (sn == NULL || sn_len == 0)
283 read_lock(&local->sockets.lock);
287 sk_for_each(sk, node, &local->sockets.head) {
288 tmp_sock = nfc_llcp_sock(sk);
290 pr_debug("llcp sock %p\n", tmp_sock);
292 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
293 tmp_sock->sk.sk_state != LLCP_LISTEN)
296 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
297 tmp_sock->sk.sk_state != LLCP_BOUND)
300 if (tmp_sock->service_name == NULL ||
301 tmp_sock->service_name_len == 0)
304 if (tmp_sock->service_name_len != sn_len)
307 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
308 llcp_sock = tmp_sock;
313 read_unlock(&local->sockets.lock);
315 pr_debug("Found llcp sock %p\n", llcp_sock);
320 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
321 struct nfc_llcp_sock *sock)
323 mutex_lock(&local->sdp_lock);
325 if (sock->service_name != NULL && sock->service_name_len > 0) {
326 int ssap = nfc_llcp_wks_sap(sock->service_name,
327 sock->service_name_len);
330 pr_debug("WKS %d\n", ssap);
332 /* This is a WKS, let's check if it's free */
333 if (local->local_wks & BIT(ssap)) {
334 mutex_unlock(&local->sdp_lock);
339 set_bit(ssap, &local->local_wks);
340 mutex_unlock(&local->sdp_lock);
346 * Check if there already is a non WKS socket bound
347 * to this service name.
349 if (nfc_llcp_sock_from_sn(local, sock->service_name,
350 sock->service_name_len) != NULL) {
351 mutex_unlock(&local->sdp_lock);
356 mutex_unlock(&local->sdp_lock);
358 return LLCP_SDP_UNBOUND;
360 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
361 if (!test_bit(sock->ssap, &local->local_wks)) {
362 set_bit(sock->ssap, &local->local_wks);
363 mutex_unlock(&local->sdp_lock);
369 mutex_unlock(&local->sdp_lock);
374 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
378 mutex_lock(&local->sdp_lock);
380 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
381 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
382 mutex_unlock(&local->sdp_lock);
386 set_bit(local_ssap, &local->local_sap);
388 mutex_unlock(&local->sdp_lock);
390 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
393 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
398 if (ssap < LLCP_WKS_NUM_SAP) {
400 sdp = &local->local_wks;
401 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
402 atomic_t *client_cnt;
404 local_ssap = ssap - LLCP_WKS_NUM_SAP;
405 sdp = &local->local_sdp;
406 client_cnt = &local->local_sdp_cnt[local_ssap];
408 pr_debug("%d clients\n", atomic_read(client_cnt));
410 mutex_lock(&local->sdp_lock);
412 if (atomic_dec_and_test(client_cnt)) {
413 struct nfc_llcp_sock *l_sock;
415 pr_debug("No more clients for SAP %d\n", ssap);
417 clear_bit(local_ssap, sdp);
419 /* Find the listening sock and set it back to UNBOUND */
420 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
422 l_sock->ssap = LLCP_SDP_UNBOUND;
423 nfc_llcp_sock_put(l_sock);
427 mutex_unlock(&local->sdp_lock);
430 } else if (ssap < LLCP_MAX_SAP) {
431 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
432 sdp = &local->local_sap;
437 mutex_lock(&local->sdp_lock);
439 clear_bit(local_ssap, sdp);
441 mutex_unlock(&local->sdp_lock);
444 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
448 mutex_lock(&local->sdp_lock);
450 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
451 if (ssap == LLCP_SDP_NUM_SAP) {
452 mutex_unlock(&local->sdp_lock);
457 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
459 set_bit(ssap, &local->local_sdp);
461 mutex_unlock(&local->sdp_lock);
463 return LLCP_WKS_NUM_SAP + ssap;
466 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
468 u8 *gb_cur, *version_tlv, version, version_length;
469 u8 *lto_tlv, lto_length;
470 u8 *wks_tlv, wks_length;
471 u8 *miux_tlv, miux_length;
475 version = LLCP_VERSION_11;
476 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
478 gb_len += version_length;
480 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length);
481 gb_len += lto_length;
483 pr_debug("Local wks 0x%lx\n", local->local_wks);
484 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
486 gb_len += wks_length;
488 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
490 gb_len += miux_length;
492 gb_len += ARRAY_SIZE(llcp_magic);
494 if (gb_len > NFC_MAX_GT_LEN) {
501 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
502 gb_cur += ARRAY_SIZE(llcp_magic);
504 memcpy(gb_cur, version_tlv, version_length);
505 gb_cur += version_length;
507 memcpy(gb_cur, lto_tlv, lto_length);
508 gb_cur += lto_length;
510 memcpy(gb_cur, wks_tlv, wks_length);
511 gb_cur += wks_length;
513 memcpy(gb_cur, miux_tlv, miux_length);
514 gb_cur += miux_length;
516 local->gb_len = gb_len;
527 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
529 struct nfc_llcp_local *local;
531 local = nfc_llcp_find_local(dev);
533 *general_bytes_len = 0;
537 nfc_llcp_build_gb(local);
539 *general_bytes_len = local->gb_len;
544 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
546 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
549 pr_err("No LLCP device\n");
555 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
556 memcpy(local->remote_gb, gb, gb_len);
557 local->remote_gb_len = gb_len;
559 if (memcmp(local->remote_gb, llcp_magic, 3)) {
560 pr_err("MAC does not support LLCP\n");
564 return nfc_llcp_parse_gb_tlv(local,
565 &local->remote_gb[3],
566 local->remote_gb_len - 3);
569 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
571 return (pdu->data[0] & 0xfc) >> 2;
574 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
576 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
579 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
581 return pdu->data[1] & 0x3f;
584 static u8 nfc_llcp_ns(struct sk_buff *pdu)
586 return pdu->data[2] >> 4;
589 static u8 nfc_llcp_nr(struct sk_buff *pdu)
591 return pdu->data[2] & 0xf;
594 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
596 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
597 sock->send_n = (sock->send_n + 1) % 16;
598 sock->recv_ack_n = (sock->recv_n - 1) % 16;
601 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
602 struct sk_buff *skb, u8 direction)
604 struct hlist_node *node;
605 struct sk_buff *skb_copy = NULL, *nskb;
609 read_lock(&local->raw_sockets.lock);
611 sk_for_each(sk, node, &local->raw_sockets.head) {
612 if (sk->sk_state != LLCP_BOUND)
615 if (skb_copy == NULL) {
616 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
619 if (skb_copy == NULL)
622 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
624 data[0] = local->dev ? local->dev->idx : 0xFF;
628 nskb = skb_clone(skb_copy, GFP_ATOMIC);
632 if (sock_queue_rcv_skb(sk, nskb))
636 read_unlock(&local->raw_sockets.lock);
641 static void nfc_llcp_tx_work(struct work_struct *work)
643 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
647 struct nfc_llcp_sock *llcp_sock;
649 skb = skb_dequeue(&local->tx_queue);
652 llcp_sock = nfc_llcp_sock(sk);
654 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
655 nfc_llcp_send_symm(local->dev);
657 struct sk_buff *copy_skb = NULL;
658 u8 ptype = nfc_llcp_ptype(skb);
661 pr_debug("Sending pending skb\n");
662 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
663 DUMP_PREFIX_OFFSET, 16, 1,
664 skb->data, skb->len, true);
666 if (ptype == LLCP_PDU_I)
667 copy_skb = skb_copy(skb, GFP_ATOMIC);
669 __net_timestamp(skb);
671 nfc_llcp_send_to_raw_sock(local, skb,
672 NFC_LLCP_DIRECTION_TX);
674 ret = nfc_data_exchange(local->dev, local->target_idx,
675 skb, nfc_llcp_recv, local);
682 if (ptype == LLCP_PDU_I && copy_skb)
683 skb_queue_tail(&llcp_sock->tx_pending_queue,
687 nfc_llcp_send_symm(local->dev);
691 mod_timer(&local->link_timer,
692 jiffies + msecs_to_jiffies(2 * local->remote_lto));
695 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
699 struct nfc_llcp_sock *llcp_sock;
700 struct hlist_node *node;
702 read_lock(&local->connecting_sockets.lock);
704 sk_for_each(sk, node, &local->connecting_sockets.head) {
705 llcp_sock = nfc_llcp_sock(sk);
707 if (llcp_sock->ssap == ssap) {
708 sock_hold(&llcp_sock->sk);
716 read_unlock(&local->connecting_sockets.lock);
721 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
722 u8 *sn, size_t sn_len)
724 struct nfc_llcp_sock *llcp_sock;
726 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
728 if (llcp_sock == NULL)
731 sock_hold(&llcp_sock->sk);
736 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
738 u8 *tlv = &skb->data[2], type, length;
739 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
741 while (offset < tlv_array_len) {
745 pr_debug("type 0x%x length %d\n", type, length);
747 if (type == LLCP_TLV_SN) {
752 offset += length + 2;
759 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
762 struct nfc_llcp_sock *llcp_sock;
763 struct nfc_llcp_ui_cb *ui_cb;
766 dsap = nfc_llcp_dsap(skb);
767 ssap = nfc_llcp_ssap(skb);
769 ui_cb = nfc_llcp_ui_skb_cb(skb);
773 printk("%s %d %d\n", __func__, dsap, ssap);
775 pr_debug("%d %d\n", dsap, ssap);
777 /* We're looking for a bound socket, not a client one */
778 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
779 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
782 /* There is no sequence with UI frames */
783 skb_pull(skb, LLCP_HEADER_SIZE);
784 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
786 * UI frames will be freed from the socket layer, so we
787 * need to keep them alive until someone receives them.
791 pr_err("Receive queue is full\n");
795 nfc_llcp_sock_put(llcp_sock);
798 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
801 struct sock *new_sk, *parent;
802 struct nfc_llcp_sock *sock, *new_sock;
803 u8 dsap, ssap, reason;
805 dsap = nfc_llcp_dsap(skb);
806 ssap = nfc_llcp_ssap(skb);
808 pr_debug("%d %d\n", dsap, ssap);
810 if (dsap != LLCP_SAP_SDP) {
811 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
812 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
813 reason = LLCP_DM_NOBOUND;
820 sn = nfc_llcp_connect_sn(skb, &sn_len);
822 reason = LLCP_DM_NOBOUND;
826 pr_debug("Service name length %zu\n", sn_len);
828 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
830 reason = LLCP_DM_NOBOUND;
835 lock_sock(&sock->sk);
839 if (sk_acceptq_is_full(parent)) {
840 reason = LLCP_DM_REJ;
841 release_sock(&sock->sk);
846 if (sock->ssap == LLCP_SDP_UNBOUND) {
847 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
849 pr_debug("First client, reserving %d\n", ssap);
851 if (ssap == LLCP_SAP_MAX) {
852 reason = LLCP_DM_REJ;
853 release_sock(&sock->sk);
861 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
862 if (new_sk == NULL) {
863 reason = LLCP_DM_REJ;
864 release_sock(&sock->sk);
869 new_sock = nfc_llcp_sock(new_sk);
870 new_sock->dev = local->dev;
871 new_sock->local = nfc_llcp_local_get(local);
872 new_sock->miu = local->remote_miu;
873 new_sock->nfc_protocol = sock->nfc_protocol;
874 new_sock->dsap = ssap;
875 new_sock->target_idx = local->target_idx;
876 new_sock->parent = parent;
877 new_sock->ssap = sock->ssap;
878 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
879 atomic_t *client_count;
881 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
884 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
886 atomic_inc(client_count);
887 new_sock->reserved_ssap = sock->ssap;
890 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
891 skb->len - LLCP_HEADER_SIZE);
893 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
895 nfc_llcp_sock_link(&local->sockets, new_sk);
897 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
899 nfc_get_device(local->dev->idx);
901 new_sk->sk_state = LLCP_CONNECTED;
903 /* Wake the listening processes */
904 parent->sk_data_ready(parent, 0);
907 nfc_llcp_send_cc(new_sock);
909 release_sock(&sock->sk);
916 nfc_llcp_send_dm(local, dsap, ssap, reason);
919 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
922 struct nfc_llcp_local *local = sock->local;
924 pr_debug("Remote ready %d tx queue len %d remote rw %d",
925 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
928 /* Try to queue some I frames for transmission */
929 while (sock->remote_ready &&
930 skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
933 pdu = skb_dequeue(&sock->tx_queue);
937 /* Update N(S)/N(R) */
938 nfc_llcp_set_nrns(sock, pdu);
940 skb_queue_tail(&local->tx_queue, pdu);
947 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
950 struct nfc_llcp_sock *llcp_sock;
952 u8 dsap, ssap, ptype, ns, nr;
954 ptype = nfc_llcp_ptype(skb);
955 dsap = nfc_llcp_dsap(skb);
956 ssap = nfc_llcp_ssap(skb);
957 ns = nfc_llcp_ns(skb);
958 nr = nfc_llcp_nr(skb);
960 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
962 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
963 if (llcp_sock == NULL) {
964 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
970 if (sk->sk_state == LLCP_CLOSED) {
972 nfc_llcp_sock_put(llcp_sock);
975 /* Pass the payload upstream */
976 if (ptype == LLCP_PDU_I) {
977 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
979 if (ns == llcp_sock->recv_n)
980 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
982 pr_err("Received out of sequence I PDU\n");
984 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
985 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
987 * I frames will be freed from the socket layer, so we
988 * need to keep them alive until someone receives them.
992 pr_err("Receive queue is full\n");
997 /* Remove skbs from the pending queue */
998 if (llcp_sock->send_ack_n != nr) {
999 struct sk_buff *s, *tmp;
1002 llcp_sock->send_ack_n = nr;
1004 /* Remove and free all skbs until ns == nr */
1005 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1008 skb_unlink(s, &llcp_sock->tx_pending_queue);
1015 /* Re-queue the remaining skbs for transmission */
1016 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1018 skb_unlink(s, &llcp_sock->tx_pending_queue);
1019 skb_queue_head(&local->tx_queue, s);
1023 if (ptype == LLCP_PDU_RR)
1024 llcp_sock->remote_ready = true;
1025 else if (ptype == LLCP_PDU_RNR)
1026 llcp_sock->remote_ready = false;
1028 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1029 nfc_llcp_send_rr(llcp_sock);
1032 nfc_llcp_sock_put(llcp_sock);
1035 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1036 struct sk_buff *skb)
1038 struct nfc_llcp_sock *llcp_sock;
1042 dsap = nfc_llcp_dsap(skb);
1043 ssap = nfc_llcp_ssap(skb);
1045 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1046 if (llcp_sock == NULL) {
1047 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1051 sk = &llcp_sock->sk;
1054 nfc_llcp_socket_purge(llcp_sock);
1056 if (sk->sk_state == LLCP_CLOSED) {
1058 nfc_llcp_sock_put(llcp_sock);
1061 if (sk->sk_state == LLCP_CONNECTED) {
1062 nfc_put_device(local->dev);
1063 sk->sk_state = LLCP_CLOSED;
1064 sk->sk_state_change(sk);
1067 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1070 nfc_llcp_sock_put(llcp_sock);
1073 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1075 struct nfc_llcp_sock *llcp_sock;
1079 dsap = nfc_llcp_dsap(skb);
1080 ssap = nfc_llcp_ssap(skb);
1082 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1083 if (llcp_sock == NULL) {
1084 pr_err("Invalid CC\n");
1085 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1090 sk = &llcp_sock->sk;
1092 /* Unlink from connecting and link to the client array */
1093 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1094 nfc_llcp_sock_link(&local->sockets, sk);
1095 llcp_sock->dsap = ssap;
1097 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1098 skb->len - LLCP_HEADER_SIZE);
1100 sk->sk_state = LLCP_CONNECTED;
1101 sk->sk_state_change(sk);
1103 nfc_llcp_sock_put(llcp_sock);
1106 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1108 struct nfc_llcp_sock *llcp_sock;
1110 u8 dsap, ssap, reason;
1112 dsap = nfc_llcp_dsap(skb);
1113 ssap = nfc_llcp_ssap(skb);
1114 reason = skb->data[2];
1116 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1119 case LLCP_DM_NOBOUND:
1121 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1125 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1129 if (llcp_sock == NULL) {
1130 pr_debug("Already closed\n");
1134 sk = &llcp_sock->sk;
1137 sk->sk_state = LLCP_CLOSED;
1138 sk->sk_state_change(sk);
1140 nfc_llcp_sock_put(llcp_sock);
1143 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1144 struct sk_buff *skb)
1146 struct nfc_llcp_sock *llcp_sock;
1147 u8 dsap, ssap, *tlv, type, length, tid, sap;
1148 u16 tlv_len, offset;
1150 size_t service_name_len;
1152 dsap = nfc_llcp_dsap(skb);
1153 ssap = nfc_llcp_ssap(skb);
1155 pr_debug("%d %d\n", dsap, ssap);
1157 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1158 pr_err("Wrong SNL SAP\n");
1162 tlv = &skb->data[LLCP_HEADER_SIZE];
1163 tlv_len = skb->len - LLCP_HEADER_SIZE;
1166 while (offset < tlv_len) {
1171 case LLCP_TLV_SDREQ:
1173 service_name = (char *) &tlv[3];
1174 service_name_len = length - 1;
1176 pr_debug("Looking for %.16s\n", service_name);
1178 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1179 !strncmp(service_name, "urn:nfc:sn:sdp",
1180 service_name_len)) {
1185 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1193 * We found a socket but its ssap has not been reserved
1194 * yet. We need to assign it for good and send a reply.
1195 * The ssap will be freed when the socket is closed.
1197 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1198 atomic_t *client_count;
1200 sap = nfc_llcp_reserve_sdp_ssap(local);
1202 pr_debug("Reserving %d\n", sap);
1204 if (sap == LLCP_SAP_MAX) {
1210 &local->local_sdp_cnt[sap -
1213 atomic_inc(client_count);
1215 llcp_sock->ssap = sap;
1216 llcp_sock->reserved_ssap = sap;
1218 sap = llcp_sock->ssap;
1221 pr_debug("%p %d\n", llcp_sock, sap);
1224 nfc_llcp_send_snl(local, tid, sap);
1228 pr_err("Invalid SNL tlv value 0x%x\n", type);
1232 offset += length + 2;
1237 static void nfc_llcp_rx_work(struct work_struct *work)
1239 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1241 u8 dsap, ssap, ptype;
1242 struct sk_buff *skb;
1244 skb = local->rx_pending;
1246 pr_debug("No pending SKB\n");
1250 ptype = nfc_llcp_ptype(skb);
1251 dsap = nfc_llcp_dsap(skb);
1252 ssap = nfc_llcp_ssap(skb);
1254 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1256 if (ptype != LLCP_PDU_SYMM)
1257 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1258 16, 1, skb->data, skb->len, true);
1260 __net_timestamp(skb);
1262 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1271 nfc_llcp_recv_ui(local, skb);
1274 case LLCP_PDU_CONNECT:
1275 pr_debug("CONNECT\n");
1276 nfc_llcp_recv_connect(local, skb);
1281 nfc_llcp_recv_disc(local, skb);
1286 nfc_llcp_recv_cc(local, skb);
1291 nfc_llcp_recv_dm(local, skb);
1296 nfc_llcp_recv_snl(local, skb);
1302 pr_debug("I frame\n");
1303 nfc_llcp_recv_hdlc(local, skb);
1308 schedule_work(&local->tx_work);
1309 kfree_skb(local->rx_pending);
1310 local->rx_pending = NULL;
1313 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1315 local->rx_pending = skb;
1316 del_timer(&local->link_timer);
1317 schedule_work(&local->rx_work);
1320 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1322 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1324 pr_debug("Received an LLCP PDU\n");
1326 pr_err("err %d\n", err);
1330 __nfc_llcp_recv(local, skb);
1333 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1335 struct nfc_llcp_local *local;
1337 local = nfc_llcp_find_local(dev);
1341 __nfc_llcp_recv(local, skb);
1346 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1348 struct nfc_llcp_local *local;
1350 local = nfc_llcp_find_local(dev);
1354 /* Close and purge all existing sockets */
1355 nfc_llcp_socket_release(local, true);
1358 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1359 u8 comm_mode, u8 rf_mode)
1361 struct nfc_llcp_local *local;
1363 pr_debug("rf mode %d\n", rf_mode);
1365 local = nfc_llcp_find_local(dev);
1369 local->target_idx = target_idx;
1370 local->comm_mode = comm_mode;
1371 local->rf_mode = rf_mode;
1373 if (rf_mode == NFC_RF_INITIATOR) {
1374 pr_debug("Queueing Tx work\n");
1376 schedule_work(&local->tx_work);
1378 mod_timer(&local->link_timer,
1379 jiffies + msecs_to_jiffies(local->remote_lto));
1383 int nfc_llcp_register_device(struct nfc_dev *ndev)
1385 struct nfc_llcp_local *local;
1387 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1392 INIT_LIST_HEAD(&local->list);
1393 kref_init(&local->ref);
1394 mutex_init(&local->sdp_lock);
1395 init_timer(&local->link_timer);
1396 local->link_timer.data = (unsigned long) local;
1397 local->link_timer.function = nfc_llcp_symm_timer;
1399 skb_queue_head_init(&local->tx_queue);
1400 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1402 local->rx_pending = NULL;
1403 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1405 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1407 rwlock_init(&local->sockets.lock);
1408 rwlock_init(&local->connecting_sockets.lock);
1409 rwlock_init(&local->raw_sockets.lock);
1411 local->lto = 150; /* 1500 ms */
1412 local->rw = LLCP_MAX_RW;
1413 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1415 nfc_llcp_build_gb(local);
1417 local->remote_miu = LLCP_DEFAULT_MIU;
1418 local->remote_lto = LLCP_DEFAULT_LTO;
1420 list_add(&local->list, &llcp_devices);
1425 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1427 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1429 if (local == NULL) {
1430 pr_debug("No such device\n");
1434 nfc_llcp_local_put(local);
1437 int __init nfc_llcp_init(void)
1439 INIT_LIST_HEAD(&llcp_devices);
1441 return nfc_llcp_sock_init();
1444 void nfc_llcp_exit(void)
1446 nfc_llcp_sock_exit();