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
,
71 bh_lock_sock(accept_sk
);
73 nfc_llcp_accept_unlink(accept_sk
);
75 accept_sk
->sk_state
= LLCP_CLOSED
;
77 bh_unlock_sock(accept_sk
);
79 sock_orphan(accept_sk
);
89 * If we have a connection less socket bound, we keep it alive
90 * if the device is still present.
92 if (sk
->sk_state
== LLCP_BOUND
&& sk
->sk_type
== SOCK_DGRAM
&&
98 sk
->sk_state
= LLCP_CLOSED
;
104 sk_del_node_init(sk
);
107 write_unlock(&local
->sockets
.lock
);
110 struct nfc_llcp_local
*nfc_llcp_local_get(struct nfc_llcp_local
*local
)
112 kref_get(&local
->ref
);
117 static void local_release(struct kref
*ref
)
119 struct nfc_llcp_local
*local
;
121 local
= container_of(ref
, struct nfc_llcp_local
, ref
);
123 list_del(&local
->list
);
124 nfc_llcp_socket_release(local
, false);
125 del_timer_sync(&local
->link_timer
);
126 skb_queue_purge(&local
->tx_queue
);
127 cancel_work_sync(&local
->tx_work
);
128 cancel_work_sync(&local
->rx_work
);
129 cancel_work_sync(&local
->timeout_work
);
130 kfree_skb(local
->rx_pending
);
134 int nfc_llcp_local_put(struct nfc_llcp_local
*local
)
139 return kref_put(&local
->ref
, local_release
);
142 static struct nfc_llcp_sock
*nfc_llcp_sock_get(struct nfc_llcp_local
*local
,
146 struct hlist_node
*node
;
147 struct nfc_llcp_sock
*llcp_sock
, *tmp_sock
;
149 pr_debug("ssap dsap %d %d\n", ssap
, dsap
);
151 if (ssap
== 0 && dsap
== 0)
154 read_lock(&local
->sockets
.lock
);
158 sk_for_each(sk
, node
, &local
->sockets
.head
) {
159 tmp_sock
= nfc_llcp_sock(sk
);
161 if (tmp_sock
->ssap
== ssap
&& tmp_sock
->dsap
== dsap
) {
162 llcp_sock
= tmp_sock
;
167 read_unlock(&local
->sockets
.lock
);
169 if (llcp_sock
== NULL
)
172 sock_hold(&llcp_sock
->sk
);
177 static void nfc_llcp_sock_put(struct nfc_llcp_sock
*sock
)
182 static void nfc_llcp_timeout_work(struct work_struct
*work
)
184 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
187 nfc_dep_link_down(local
->dev
);
190 static void nfc_llcp_symm_timer(unsigned long data
)
192 struct nfc_llcp_local
*local
= (struct nfc_llcp_local
*) data
;
194 pr_err("SYMM timeout\n");
196 schedule_work(&local
->timeout_work
);
199 struct nfc_llcp_local
*nfc_llcp_find_local(struct nfc_dev
*dev
)
201 struct nfc_llcp_local
*local
, *n
;
203 list_for_each_entry_safe(local
, n
, &llcp_devices
, list
)
204 if (local
->dev
== dev
)
207 pr_debug("No device found\n");
212 static char *wks
[] = {
220 static int nfc_llcp_wks_sap(char *service_name
, size_t service_name_len
)
224 pr_debug("%s\n", service_name
);
226 if (service_name
== NULL
)
229 num_wks
= ARRAY_SIZE(wks
);
231 for (sap
= 0; sap
< num_wks
; sap
++) {
232 if (wks
[sap
] == NULL
)
235 if (strncmp(wks
[sap
], service_name
, service_name_len
) == 0)
243 struct nfc_llcp_sock
*nfc_llcp_sock_from_sn(struct nfc_llcp_local
*local
,
244 u8
*sn
, size_t sn_len
)
247 struct hlist_node
*node
;
248 struct nfc_llcp_sock
*llcp_sock
, *tmp_sock
;
250 pr_debug("sn %zd %p\n", sn_len
, sn
);
252 if (sn
== NULL
|| sn_len
== 0)
255 read_lock(&local
->sockets
.lock
);
259 sk_for_each(sk
, node
, &local
->sockets
.head
) {
260 tmp_sock
= nfc_llcp_sock(sk
);
262 pr_debug("llcp sock %p\n", tmp_sock
);
264 if (tmp_sock
->sk
.sk_type
== SOCK_STREAM
&&
265 tmp_sock
->sk
.sk_state
!= LLCP_LISTEN
)
268 if (tmp_sock
->sk
.sk_type
== SOCK_DGRAM
&&
269 tmp_sock
->sk
.sk_state
!= LLCP_BOUND
)
272 if (tmp_sock
->service_name
== NULL
||
273 tmp_sock
->service_name_len
== 0)
276 if (tmp_sock
->service_name_len
!= sn_len
)
279 if (memcmp(sn
, tmp_sock
->service_name
, sn_len
) == 0) {
280 llcp_sock
= tmp_sock
;
285 read_unlock(&local
->sockets
.lock
);
287 pr_debug("Found llcp sock %p\n", llcp_sock
);
292 u8
nfc_llcp_get_sdp_ssap(struct nfc_llcp_local
*local
,
293 struct nfc_llcp_sock
*sock
)
295 mutex_lock(&local
->sdp_lock
);
297 if (sock
->service_name
!= NULL
&& sock
->service_name_len
> 0) {
298 int ssap
= nfc_llcp_wks_sap(sock
->service_name
,
299 sock
->service_name_len
);
302 pr_debug("WKS %d\n", ssap
);
304 /* This is a WKS, let's check if it's free */
305 if (local
->local_wks
& BIT(ssap
)) {
306 mutex_unlock(&local
->sdp_lock
);
311 set_bit(ssap
, &local
->local_wks
);
312 mutex_unlock(&local
->sdp_lock
);
318 * Check if there already is a non WKS socket bound
319 * to this service name.
321 if (nfc_llcp_sock_from_sn(local
, sock
->service_name
,
322 sock
->service_name_len
) != NULL
) {
323 mutex_unlock(&local
->sdp_lock
);
328 mutex_unlock(&local
->sdp_lock
);
330 return LLCP_SDP_UNBOUND
;
332 } else if (sock
->ssap
!= 0 && sock
->ssap
< LLCP_WKS_NUM_SAP
) {
333 if (!test_bit(sock
->ssap
, &local
->local_wks
)) {
334 set_bit(sock
->ssap
, &local
->local_wks
);
335 mutex_unlock(&local
->sdp_lock
);
341 mutex_unlock(&local
->sdp_lock
);
346 u8
nfc_llcp_get_local_ssap(struct nfc_llcp_local
*local
)
350 mutex_lock(&local
->sdp_lock
);
352 local_ssap
= find_first_zero_bit(&local
->local_sap
, LLCP_LOCAL_NUM_SAP
);
353 if (local_ssap
== LLCP_LOCAL_NUM_SAP
) {
354 mutex_unlock(&local
->sdp_lock
);
358 set_bit(local_ssap
, &local
->local_sap
);
360 mutex_unlock(&local
->sdp_lock
);
362 return local_ssap
+ LLCP_LOCAL_SAP_OFFSET
;
365 void nfc_llcp_put_ssap(struct nfc_llcp_local
*local
, u8 ssap
)
370 if (ssap
< LLCP_WKS_NUM_SAP
) {
372 sdp
= &local
->local_wks
;
373 } else if (ssap
< LLCP_LOCAL_NUM_SAP
) {
374 atomic_t
*client_cnt
;
376 local_ssap
= ssap
- LLCP_WKS_NUM_SAP
;
377 sdp
= &local
->local_sdp
;
378 client_cnt
= &local
->local_sdp_cnt
[local_ssap
];
380 pr_debug("%d clients\n", atomic_read(client_cnt
));
382 mutex_lock(&local
->sdp_lock
);
384 if (atomic_dec_and_test(client_cnt
)) {
385 struct nfc_llcp_sock
*l_sock
;
387 pr_debug("No more clients for SAP %d\n", ssap
);
389 clear_bit(local_ssap
, sdp
);
391 /* Find the listening sock and set it back to UNBOUND */
392 l_sock
= nfc_llcp_sock_get(local
, ssap
, LLCP_SAP_SDP
);
394 l_sock
->ssap
= LLCP_SDP_UNBOUND
;
395 nfc_llcp_sock_put(l_sock
);
399 mutex_unlock(&local
->sdp_lock
);
402 } else if (ssap
< LLCP_MAX_SAP
) {
403 local_ssap
= ssap
- LLCP_LOCAL_NUM_SAP
;
404 sdp
= &local
->local_sap
;
409 mutex_lock(&local
->sdp_lock
);
411 clear_bit(local_ssap
, sdp
);
413 mutex_unlock(&local
->sdp_lock
);
416 static u8
nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local
*local
)
420 mutex_lock(&local
->sdp_lock
);
422 ssap
= find_first_zero_bit(&local
->local_sdp
, LLCP_SDP_NUM_SAP
);
423 if (ssap
== LLCP_SDP_NUM_SAP
) {
424 mutex_unlock(&local
->sdp_lock
);
429 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP
+ ssap
);
431 set_bit(ssap
, &local
->local_sdp
);
433 mutex_unlock(&local
->sdp_lock
);
435 return LLCP_WKS_NUM_SAP
+ ssap
;
438 static int nfc_llcp_build_gb(struct nfc_llcp_local
*local
)
440 u8
*gb_cur
, *version_tlv
, version
, version_length
;
441 u8
*lto_tlv
, lto
, lto_length
;
442 u8
*wks_tlv
, wks_length
;
443 u8
*miux_tlv
, miux_length
;
448 version
= LLCP_VERSION_11
;
449 version_tlv
= nfc_llcp_build_tlv(LLCP_TLV_VERSION
, &version
,
451 gb_len
+= version_length
;
455 lto_tlv
= nfc_llcp_build_tlv(LLCP_TLV_LTO
, <o
, 1, <o_length
);
456 gb_len
+= lto_length
;
458 pr_debug("Local wks 0x%lx\n", local
->local_wks
);
459 wks_tlv
= nfc_llcp_build_tlv(LLCP_TLV_WKS
, (u8
*)&local
->local_wks
, 2,
461 gb_len
+= wks_length
;
463 miux
= cpu_to_be16(LLCP_MAX_MIUX
);
464 miux_tlv
= nfc_llcp_build_tlv(LLCP_TLV_MIUX
, (u8
*)&miux
, 0,
466 gb_len
+= miux_length
;
468 gb_len
+= ARRAY_SIZE(llcp_magic
);
470 if (gb_len
> NFC_MAX_GT_LEN
) {
477 memcpy(gb_cur
, llcp_magic
, ARRAY_SIZE(llcp_magic
));
478 gb_cur
+= ARRAY_SIZE(llcp_magic
);
480 memcpy(gb_cur
, version_tlv
, version_length
);
481 gb_cur
+= version_length
;
483 memcpy(gb_cur
, lto_tlv
, lto_length
);
484 gb_cur
+= lto_length
;
486 memcpy(gb_cur
, wks_tlv
, wks_length
);
487 gb_cur
+= wks_length
;
489 memcpy(gb_cur
, miux_tlv
, miux_length
);
490 gb_cur
+= miux_length
;
492 local
->gb_len
= gb_len
;
503 u8
*nfc_llcp_general_bytes(struct nfc_dev
*dev
, size_t *general_bytes_len
)
505 struct nfc_llcp_local
*local
;
507 local
= nfc_llcp_find_local(dev
);
509 *general_bytes_len
= 0;
513 nfc_llcp_build_gb(local
);
515 *general_bytes_len
= local
->gb_len
;
520 int nfc_llcp_set_remote_gb(struct nfc_dev
*dev
, u8
*gb
, u8 gb_len
)
522 struct nfc_llcp_local
*local
= nfc_llcp_find_local(dev
);
525 pr_err("No LLCP device\n");
529 memset(local
->remote_gb
, 0, NFC_MAX_GT_LEN
);
530 memcpy(local
->remote_gb
, gb
, gb_len
);
531 local
->remote_gb_len
= gb_len
;
533 if (local
->remote_gb
== NULL
|| local
->remote_gb_len
== 0)
536 if (memcmp(local
->remote_gb
, llcp_magic
, 3)) {
537 pr_err("MAC does not support LLCP\n");
541 return nfc_llcp_parse_gb_tlv(local
,
542 &local
->remote_gb
[3],
543 local
->remote_gb_len
- 3);
546 static u8
nfc_llcp_dsap(struct sk_buff
*pdu
)
548 return (pdu
->data
[0] & 0xfc) >> 2;
551 static u8
nfc_llcp_ptype(struct sk_buff
*pdu
)
553 return ((pdu
->data
[0] & 0x03) << 2) | ((pdu
->data
[1] & 0xc0) >> 6);
556 static u8
nfc_llcp_ssap(struct sk_buff
*pdu
)
558 return pdu
->data
[1] & 0x3f;
561 static u8
nfc_llcp_ns(struct sk_buff
*pdu
)
563 return pdu
->data
[2] >> 4;
566 static u8
nfc_llcp_nr(struct sk_buff
*pdu
)
568 return pdu
->data
[2] & 0xf;
571 static void nfc_llcp_set_nrns(struct nfc_llcp_sock
*sock
, struct sk_buff
*pdu
)
573 pdu
->data
[2] = (sock
->send_n
<< 4) | (sock
->recv_n
);
574 sock
->send_n
= (sock
->send_n
+ 1) % 16;
575 sock
->recv_ack_n
= (sock
->recv_n
- 1) % 16;
578 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local
*local
,
579 struct sk_buff
*skb
, u8 direction
)
581 struct hlist_node
*node
;
582 struct sk_buff
*skb_copy
= NULL
, *nskb
;
586 read_lock(&local
->raw_sockets
.lock
);
588 sk_for_each(sk
, node
, &local
->raw_sockets
.head
) {
589 if (sk
->sk_state
!= LLCP_BOUND
)
592 if (skb_copy
== NULL
) {
593 skb_copy
= __pskb_copy(skb
, NFC_LLCP_RAW_HEADER_SIZE
,
596 if (skb_copy
== NULL
)
599 data
= skb_push(skb_copy
, NFC_LLCP_RAW_HEADER_SIZE
);
601 data
[0] = local
->dev
? local
->dev
->idx
: 0xFF;
605 nskb
= skb_clone(skb_copy
, GFP_ATOMIC
);
609 if (sock_queue_rcv_skb(sk
, nskb
))
613 read_unlock(&local
->raw_sockets
.lock
);
618 static void nfc_llcp_tx_work(struct work_struct
*work
)
620 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
624 struct nfc_llcp_sock
*llcp_sock
;
626 skb
= skb_dequeue(&local
->tx_queue
);
629 llcp_sock
= nfc_llcp_sock(sk
);
631 if (llcp_sock
== NULL
&& nfc_llcp_ptype(skb
) == LLCP_PDU_I
) {
632 nfc_llcp_send_symm(local
->dev
);
636 pr_debug("Sending pending skb\n");
637 print_hex_dump(KERN_DEBUG
, "LLCP Tx: ",
638 DUMP_PREFIX_OFFSET
, 16, 1,
639 skb
->data
, skb
->len
, true);
641 nfc_llcp_send_to_raw_sock(local
, skb
,
642 NFC_LLCP_DIRECTION_TX
);
644 ret
= nfc_data_exchange(local
->dev
, local
->target_idx
,
645 skb
, nfc_llcp_recv
, local
);
647 if (!ret
&& nfc_llcp_ptype(skb
) == LLCP_PDU_I
) {
649 skb_queue_tail(&llcp_sock
->tx_pending_queue
,
654 nfc_llcp_send_symm(local
->dev
);
657 mod_timer(&local
->link_timer
,
658 jiffies
+ msecs_to_jiffies(2 * local
->remote_lto
));
661 static struct nfc_llcp_sock
*nfc_llcp_connecting_sock_get(struct nfc_llcp_local
*local
,
665 struct nfc_llcp_sock
*llcp_sock
;
666 struct hlist_node
*node
;
668 read_lock(&local
->connecting_sockets
.lock
);
670 sk_for_each(sk
, node
, &local
->connecting_sockets
.head
) {
671 llcp_sock
= nfc_llcp_sock(sk
);
673 if (llcp_sock
->ssap
== ssap
) {
674 sock_hold(&llcp_sock
->sk
);
682 read_unlock(&local
->connecting_sockets
.lock
);
687 static struct nfc_llcp_sock
*nfc_llcp_sock_get_sn(struct nfc_llcp_local
*local
,
688 u8
*sn
, size_t sn_len
)
690 struct nfc_llcp_sock
*llcp_sock
;
692 llcp_sock
= nfc_llcp_sock_from_sn(local
, sn
, sn_len
);
694 if (llcp_sock
== NULL
)
697 sock_hold(&llcp_sock
->sk
);
702 static u8
*nfc_llcp_connect_sn(struct sk_buff
*skb
, size_t *sn_len
)
704 u8
*tlv
= &skb
->data
[2], type
, length
;
705 size_t tlv_array_len
= skb
->len
- LLCP_HEADER_SIZE
, offset
= 0;
707 while (offset
< tlv_array_len
) {
711 pr_debug("type 0x%x length %d\n", type
, length
);
713 if (type
== LLCP_TLV_SN
) {
718 offset
+= length
+ 2;
725 static void nfc_llcp_recv_ui(struct nfc_llcp_local
*local
,
728 struct nfc_llcp_sock
*llcp_sock
;
729 struct nfc_llcp_ui_cb
*ui_cb
;
732 dsap
= nfc_llcp_dsap(skb
);
733 ssap
= nfc_llcp_ssap(skb
);
735 ui_cb
= nfc_llcp_ui_skb_cb(skb
);
739 printk("%s %d %d\n", __func__
, dsap
, ssap
);
741 pr_debug("%d %d\n", dsap
, ssap
);
743 /* We're looking for a bound socket, not a client one */
744 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, LLCP_SAP_SDP
);
745 if (llcp_sock
== NULL
|| llcp_sock
->sk
.sk_type
!= SOCK_DGRAM
)
748 /* There is no sequence with UI frames */
749 skb_pull(skb
, LLCP_HEADER_SIZE
);
750 if (sock_queue_rcv_skb(&llcp_sock
->sk
, skb
)) {
751 pr_err("receive queue is full\n");
752 skb_queue_head(&llcp_sock
->tx_backlog_queue
, skb
);
755 nfc_llcp_sock_put(llcp_sock
);
758 static void nfc_llcp_recv_connect(struct nfc_llcp_local
*local
,
761 struct sock
*new_sk
, *parent
;
762 struct nfc_llcp_sock
*sock
, *new_sock
;
763 u8 dsap
, ssap
, reason
;
765 dsap
= nfc_llcp_dsap(skb
);
766 ssap
= nfc_llcp_ssap(skb
);
768 pr_debug("%d %d\n", dsap
, ssap
);
770 if (dsap
!= LLCP_SAP_SDP
) {
771 sock
= nfc_llcp_sock_get(local
, dsap
, LLCP_SAP_SDP
);
772 if (sock
== NULL
|| sock
->sk
.sk_state
!= LLCP_LISTEN
) {
773 reason
= LLCP_DM_NOBOUND
;
780 sn
= nfc_llcp_connect_sn(skb
, &sn_len
);
782 reason
= LLCP_DM_NOBOUND
;
786 pr_debug("Service name length %zu\n", sn_len
);
788 sock
= nfc_llcp_sock_get_sn(local
, sn
, sn_len
);
790 reason
= LLCP_DM_NOBOUND
;
795 lock_sock(&sock
->sk
);
799 if (sk_acceptq_is_full(parent
)) {
800 reason
= LLCP_DM_REJ
;
801 release_sock(&sock
->sk
);
806 if (sock
->ssap
== LLCP_SDP_UNBOUND
) {
807 u8 ssap
= nfc_llcp_reserve_sdp_ssap(local
);
809 pr_debug("First client, reserving %d\n", ssap
);
811 if (ssap
== LLCP_SAP_MAX
) {
812 reason
= LLCP_DM_REJ
;
813 release_sock(&sock
->sk
);
821 new_sk
= nfc_llcp_sock_alloc(NULL
, parent
->sk_type
, GFP_ATOMIC
);
822 if (new_sk
== NULL
) {
823 reason
= LLCP_DM_REJ
;
824 release_sock(&sock
->sk
);
829 new_sock
= nfc_llcp_sock(new_sk
);
830 new_sock
->dev
= local
->dev
;
831 new_sock
->local
= nfc_llcp_local_get(local
);
832 new_sock
->miu
= local
->remote_miu
;
833 new_sock
->nfc_protocol
= sock
->nfc_protocol
;
834 new_sock
->dsap
= ssap
;
835 new_sock
->target_idx
= local
->target_idx
;
836 new_sock
->parent
= parent
;
837 new_sock
->ssap
= sock
->ssap
;
838 if (sock
->ssap
< LLCP_LOCAL_NUM_SAP
&& sock
->ssap
>= LLCP_WKS_NUM_SAP
) {
839 atomic_t
*client_count
;
841 pr_debug("reserved_ssap %d for %p\n", sock
->ssap
, new_sock
);
844 &local
->local_sdp_cnt
[sock
->ssap
- LLCP_WKS_NUM_SAP
];
846 atomic_inc(client_count
);
847 new_sock
->reserved_ssap
= sock
->ssap
;
850 nfc_llcp_parse_connection_tlv(new_sock
, &skb
->data
[LLCP_HEADER_SIZE
],
851 skb
->len
- LLCP_HEADER_SIZE
);
853 pr_debug("new sock %p sk %p\n", new_sock
, &new_sock
->sk
);
855 nfc_llcp_sock_link(&local
->sockets
, new_sk
);
857 nfc_llcp_accept_enqueue(&sock
->sk
, new_sk
);
859 nfc_get_device(local
->dev
->idx
);
861 new_sk
->sk_state
= LLCP_CONNECTED
;
863 /* Wake the listening processes */
864 parent
->sk_data_ready(parent
, 0);
867 nfc_llcp_send_cc(new_sock
);
869 release_sock(&sock
->sk
);
876 nfc_llcp_send_dm(local
, dsap
, ssap
, reason
);
879 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock
*sock
)
882 struct nfc_llcp_local
*local
= sock
->local
;
884 pr_debug("Remote ready %d tx queue len %d remote rw %d",
885 sock
->remote_ready
, skb_queue_len(&sock
->tx_pending_queue
),
888 /* Try to queue some I frames for transmission */
889 while (sock
->remote_ready
&&
890 skb_queue_len(&sock
->tx_pending_queue
) < sock
->rw
) {
893 pdu
= skb_dequeue(&sock
->tx_queue
);
897 /* Update N(S)/N(R) */
898 nfc_llcp_set_nrns(sock
, pdu
);
900 skb_queue_tail(&local
->tx_queue
, pdu
);
907 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local
*local
,
910 struct nfc_llcp_sock
*llcp_sock
;
912 u8 dsap
, ssap
, ptype
, ns
, nr
;
914 ptype
= nfc_llcp_ptype(skb
);
915 dsap
= nfc_llcp_dsap(skb
);
916 ssap
= nfc_llcp_ssap(skb
);
917 ns
= nfc_llcp_ns(skb
);
918 nr
= nfc_llcp_nr(skb
);
920 pr_debug("%d %d R %d S %d\n", dsap
, ssap
, nr
, ns
);
922 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, ssap
);
923 if (llcp_sock
== NULL
) {
924 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_NOCONN
);
930 if (sk
->sk_state
== LLCP_CLOSED
) {
932 nfc_llcp_sock_put(llcp_sock
);
935 /* Pass the payload upstream */
936 if (ptype
== LLCP_PDU_I
) {
937 pr_debug("I frame, queueing on %p\n", &llcp_sock
->sk
);
939 if (ns
== llcp_sock
->recv_n
)
940 llcp_sock
->recv_n
= (llcp_sock
->recv_n
+ 1) % 16;
942 pr_err("Received out of sequence I PDU\n");
944 skb_pull(skb
, LLCP_HEADER_SIZE
+ LLCP_SEQUENCE_SIZE
);
945 if (sock_queue_rcv_skb(&llcp_sock
->sk
, skb
)) {
946 pr_err("receive queue is full\n");
947 skb_queue_head(&llcp_sock
->tx_backlog_queue
, skb
);
951 /* Remove skbs from the pending queue */
952 if (llcp_sock
->send_ack_n
!= nr
) {
953 struct sk_buff
*s
, *tmp
;
955 llcp_sock
->send_ack_n
= nr
;
957 /* Remove and free all skbs until ns == nr */
958 skb_queue_walk_safe(&llcp_sock
->tx_pending_queue
, s
, tmp
) {
959 skb_unlink(s
, &llcp_sock
->tx_pending_queue
);
962 if (nfc_llcp_ns(s
) == nr
)
966 /* Re-queue the remaining skbs for transmission */
967 skb_queue_reverse_walk_safe(&llcp_sock
->tx_pending_queue
,
969 skb_unlink(s
, &llcp_sock
->tx_pending_queue
);
970 skb_queue_head(&local
->tx_queue
, s
);
974 if (ptype
== LLCP_PDU_RR
)
975 llcp_sock
->remote_ready
= true;
976 else if (ptype
== LLCP_PDU_RNR
)
977 llcp_sock
->remote_ready
= false;
979 if (nfc_llcp_queue_i_frames(llcp_sock
) == 0 && ptype
== LLCP_PDU_I
)
980 nfc_llcp_send_rr(llcp_sock
);
983 nfc_llcp_sock_put(llcp_sock
);
986 static void nfc_llcp_recv_disc(struct nfc_llcp_local
*local
,
989 struct nfc_llcp_sock
*llcp_sock
;
993 dsap
= nfc_llcp_dsap(skb
);
994 ssap
= nfc_llcp_ssap(skb
);
996 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, ssap
);
997 if (llcp_sock
== NULL
) {
998 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_NOCONN
);
1002 sk
= &llcp_sock
->sk
;
1004 if (sk
->sk_state
== LLCP_CLOSED
) {
1006 nfc_llcp_sock_put(llcp_sock
);
1009 if (sk
->sk_state
== LLCP_CONNECTED
) {
1010 nfc_put_device(local
->dev
);
1011 sk
->sk_state
= LLCP_CLOSED
;
1012 sk
->sk_state_change(sk
);
1015 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_DISC
);
1018 nfc_llcp_sock_put(llcp_sock
);
1021 static void nfc_llcp_recv_cc(struct nfc_llcp_local
*local
, struct sk_buff
*skb
)
1023 struct nfc_llcp_sock
*llcp_sock
;
1027 dsap
= nfc_llcp_dsap(skb
);
1028 ssap
= nfc_llcp_ssap(skb
);
1030 llcp_sock
= nfc_llcp_connecting_sock_get(local
, dsap
);
1031 if (llcp_sock
== NULL
) {
1032 pr_err("Invalid CC\n");
1033 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_NOCONN
);
1038 sk
= &llcp_sock
->sk
;
1040 /* Unlink from connecting and link to the client array */
1041 nfc_llcp_sock_unlink(&local
->connecting_sockets
, sk
);
1042 nfc_llcp_sock_link(&local
->sockets
, sk
);
1043 llcp_sock
->dsap
= ssap
;
1045 nfc_llcp_parse_connection_tlv(llcp_sock
, &skb
->data
[LLCP_HEADER_SIZE
],
1046 skb
->len
- LLCP_HEADER_SIZE
);
1048 sk
->sk_state
= LLCP_CONNECTED
;
1049 sk
->sk_state_change(sk
);
1051 nfc_llcp_sock_put(llcp_sock
);
1054 static void nfc_llcp_recv_dm(struct nfc_llcp_local
*local
, struct sk_buff
*skb
)
1056 struct nfc_llcp_sock
*llcp_sock
;
1058 u8 dsap
, ssap
, reason
;
1060 dsap
= nfc_llcp_dsap(skb
);
1061 ssap
= nfc_llcp_ssap(skb
);
1062 reason
= skb
->data
[2];
1064 pr_debug("%d %d reason %d\n", ssap
, dsap
, reason
);
1067 case LLCP_DM_NOBOUND
:
1069 llcp_sock
= nfc_llcp_connecting_sock_get(local
, dsap
);
1073 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, ssap
);
1077 if (llcp_sock
== NULL
) {
1078 pr_debug("Already closed\n");
1082 sk
= &llcp_sock
->sk
;
1085 sk
->sk_state
= LLCP_CLOSED
;
1086 sk
->sk_state_change(sk
);
1088 nfc_llcp_sock_put(llcp_sock
);
1091 static void nfc_llcp_recv_snl(struct nfc_llcp_local
*local
,
1092 struct sk_buff
*skb
)
1094 struct nfc_llcp_sock
*llcp_sock
;
1095 u8 dsap
, ssap
, *tlv
, type
, length
, tid
, sap
;
1096 u16 tlv_len
, offset
;
1098 size_t service_name_len
;
1100 dsap
= nfc_llcp_dsap(skb
);
1101 ssap
= nfc_llcp_ssap(skb
);
1103 pr_debug("%d %d\n", dsap
, ssap
);
1105 if (dsap
!= LLCP_SAP_SDP
|| ssap
!= LLCP_SAP_SDP
) {
1106 pr_err("Wrong SNL SAP\n");
1110 tlv
= &skb
->data
[LLCP_HEADER_SIZE
];
1111 tlv_len
= skb
->len
- LLCP_HEADER_SIZE
;
1114 while(offset
< tlv_len
) {
1119 case LLCP_TLV_SDREQ
:
1121 service_name
= (char *) &tlv
[3];
1122 service_name_len
= length
- 1;
1124 pr_debug("Looking for %.16s\n", service_name
);
1126 if (service_name_len
== strlen("urn:nfc:sn:sdp") &&
1127 !strncmp(service_name
, "urn:nfc:sn:sdp",
1128 service_name_len
)) {
1133 llcp_sock
= nfc_llcp_sock_from_sn(local
, service_name
,
1141 * We found a socket but its ssap has not been reserved
1142 * yet. We need to assign it for good and send a reply.
1143 * The ssap will be freed when the socket is closed.
1145 if (llcp_sock
->ssap
== LLCP_SDP_UNBOUND
) {
1146 atomic_t
*client_count
;
1148 sap
= nfc_llcp_reserve_sdp_ssap(local
);
1150 pr_debug("Reserving %d\n", sap
);
1152 if (sap
== LLCP_SAP_MAX
) {
1158 &local
->local_sdp_cnt
[sap
-
1161 atomic_inc(client_count
);
1163 llcp_sock
->ssap
= sap
;
1164 llcp_sock
->reserved_ssap
= sap
;
1166 sap
= llcp_sock
->ssap
;
1169 pr_debug("%p %d\n", llcp_sock
, sap
);
1172 nfc_llcp_send_snl(local
, tid
, sap
);
1176 pr_err("Invalid SNL tlv value 0x%x\n", type
);
1180 offset
+= length
+ 2;
1185 static void nfc_llcp_rx_work(struct work_struct
*work
)
1187 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
1189 u8 dsap
, ssap
, ptype
;
1190 struct sk_buff
*skb
;
1192 skb
= local
->rx_pending
;
1194 pr_debug("No pending SKB\n");
1198 ptype
= nfc_llcp_ptype(skb
);
1199 dsap
= nfc_llcp_dsap(skb
);
1200 ssap
= nfc_llcp_ssap(skb
);
1202 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype
, dsap
, ssap
);
1204 if (ptype
!= LLCP_PDU_SYMM
)
1205 print_hex_dump(KERN_DEBUG
, "LLCP Rx: ", DUMP_PREFIX_OFFSET
,
1206 16, 1, skb
->data
, skb
->len
, true);
1208 nfc_llcp_send_to_raw_sock(local
, skb
, NFC_LLCP_DIRECTION_RX
);
1217 nfc_llcp_recv_ui(local
, skb
);
1220 case LLCP_PDU_CONNECT
:
1221 pr_debug("CONNECT\n");
1222 nfc_llcp_recv_connect(local
, skb
);
1227 nfc_llcp_recv_disc(local
, skb
);
1232 nfc_llcp_recv_cc(local
, skb
);
1237 nfc_llcp_recv_dm(local
, skb
);
1242 nfc_llcp_recv_snl(local
, skb
);
1248 pr_debug("I frame\n");
1249 nfc_llcp_recv_hdlc(local
, skb
);
1254 schedule_work(&local
->tx_work
);
1255 kfree_skb(local
->rx_pending
);
1256 local
->rx_pending
= NULL
;
1259 void nfc_llcp_recv(void *data
, struct sk_buff
*skb
, int err
)
1261 struct nfc_llcp_local
*local
= (struct nfc_llcp_local
*) data
;
1263 pr_debug("Received an LLCP PDU\n");
1265 pr_err("err %d\n", err
);
1269 local
->rx_pending
= skb_get(skb
);
1270 del_timer(&local
->link_timer
);
1271 schedule_work(&local
->rx_work
);
1274 int nfc_llcp_data_received(struct nfc_dev
*dev
, struct sk_buff
*skb
)
1276 struct nfc_llcp_local
*local
;
1278 local
= nfc_llcp_find_local(dev
);
1282 local
->rx_pending
= skb_get(skb
);
1283 del_timer(&local
->link_timer
);
1284 schedule_work(&local
->rx_work
);
1289 void nfc_llcp_mac_is_down(struct nfc_dev
*dev
)
1291 struct nfc_llcp_local
*local
;
1293 local
= nfc_llcp_find_local(dev
);
1297 /* Close and purge all existing sockets */
1298 nfc_llcp_socket_release(local
, true);
1301 void nfc_llcp_mac_is_up(struct nfc_dev
*dev
, u32 target_idx
,
1302 u8 comm_mode
, u8 rf_mode
)
1304 struct nfc_llcp_local
*local
;
1306 pr_debug("rf mode %d\n", rf_mode
);
1308 local
= nfc_llcp_find_local(dev
);
1312 local
->target_idx
= target_idx
;
1313 local
->comm_mode
= comm_mode
;
1314 local
->rf_mode
= rf_mode
;
1316 if (rf_mode
== NFC_RF_INITIATOR
) {
1317 pr_debug("Queueing Tx work\n");
1319 schedule_work(&local
->tx_work
);
1321 mod_timer(&local
->link_timer
,
1322 jiffies
+ msecs_to_jiffies(local
->remote_lto
));
1326 int nfc_llcp_register_device(struct nfc_dev
*ndev
)
1328 struct nfc_llcp_local
*local
;
1330 local
= kzalloc(sizeof(struct nfc_llcp_local
), GFP_KERNEL
);
1335 INIT_LIST_HEAD(&local
->list
);
1336 kref_init(&local
->ref
);
1337 mutex_init(&local
->sdp_lock
);
1338 init_timer(&local
->link_timer
);
1339 local
->link_timer
.data
= (unsigned long) local
;
1340 local
->link_timer
.function
= nfc_llcp_symm_timer
;
1342 skb_queue_head_init(&local
->tx_queue
);
1343 INIT_WORK(&local
->tx_work
, nfc_llcp_tx_work
);
1345 local
->rx_pending
= NULL
;
1346 INIT_WORK(&local
->rx_work
, nfc_llcp_rx_work
);
1348 INIT_WORK(&local
->timeout_work
, nfc_llcp_timeout_work
);
1350 rwlock_init(&local
->sockets
.lock
);
1351 rwlock_init(&local
->connecting_sockets
.lock
);
1352 rwlock_init(&local
->raw_sockets
.lock
);
1354 nfc_llcp_build_gb(local
);
1356 local
->remote_miu
= LLCP_DEFAULT_MIU
;
1357 local
->remote_lto
= LLCP_DEFAULT_LTO
;
1359 list_add(&llcp_devices
, &local
->list
);
1364 void nfc_llcp_unregister_device(struct nfc_dev
*dev
)
1366 struct nfc_llcp_local
*local
= nfc_llcp_find_local(dev
);
1368 if (local
== NULL
) {
1369 pr_debug("No such device\n");
1373 nfc_llcp_local_put(local
);
1376 int __init
nfc_llcp_init(void)
1378 INIT_LIST_HEAD(&llcp_devices
);
1380 return nfc_llcp_sock_init();
1383 void nfc_llcp_exit(void)
1385 nfc_llcp_sock_exit();
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