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();
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