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();
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