]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/nfc/llcp/llcp.c
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
);
88 sk
->sk_state
= LLCP_CLOSED
;
97 write_unlock(&local
->sockets
.lock
);
100 struct nfc_llcp_local
*nfc_llcp_local_get(struct nfc_llcp_local
*local
)
102 kref_get(&local
->ref
);
107 static void local_release(struct kref
*ref
)
109 struct nfc_llcp_local
*local
;
111 local
= container_of(ref
, struct nfc_llcp_local
, ref
);
113 list_del(&local
->list
);
114 nfc_llcp_socket_release(local
, false);
115 del_timer_sync(&local
->link_timer
);
116 skb_queue_purge(&local
->tx_queue
);
117 cancel_work_sync(&local
->tx_work
);
118 cancel_work_sync(&local
->rx_work
);
119 cancel_work_sync(&local
->timeout_work
);
120 kfree_skb(local
->rx_pending
);
124 int nfc_llcp_local_put(struct nfc_llcp_local
*local
)
129 return kref_put(&local
->ref
, local_release
);
132 static struct nfc_llcp_sock
*nfc_llcp_sock_get(struct nfc_llcp_local
*local
,
136 struct hlist_node
*node
;
137 struct nfc_llcp_sock
*llcp_sock
;
139 pr_debug("ssap dsap %d %d\n", ssap
, dsap
);
141 if (ssap
== 0 && dsap
== 0)
144 read_lock(&local
->sockets
.lock
);
148 sk_for_each(sk
, node
, &local
->sockets
.head
) {
149 llcp_sock
= nfc_llcp_sock(sk
);
151 if (llcp_sock
->ssap
== ssap
&& llcp_sock
->dsap
== dsap
)
155 read_unlock(&local
->sockets
.lock
);
157 if (llcp_sock
== NULL
)
160 sock_hold(&llcp_sock
->sk
);
165 static void nfc_llcp_sock_put(struct nfc_llcp_sock
*sock
)
170 static void nfc_llcp_timeout_work(struct work_struct
*work
)
172 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
175 nfc_dep_link_down(local
->dev
);
178 static void nfc_llcp_symm_timer(unsigned long data
)
180 struct nfc_llcp_local
*local
= (struct nfc_llcp_local
*) data
;
182 pr_err("SYMM timeout\n");
184 schedule_work(&local
->timeout_work
);
187 struct nfc_llcp_local
*nfc_llcp_find_local(struct nfc_dev
*dev
)
189 struct nfc_llcp_local
*local
, *n
;
191 list_for_each_entry_safe(local
, n
, &llcp_devices
, list
)
192 if (local
->dev
== dev
)
195 pr_debug("No device found\n");
200 static char *wks
[] = {
208 static int nfc_llcp_wks_sap(char *service_name
, size_t service_name_len
)
212 pr_debug("%s\n", service_name
);
214 if (service_name
== NULL
)
217 num_wks
= ARRAY_SIZE(wks
);
219 for (sap
= 0; sap
< num_wks
; sap
++) {
220 if (wks
[sap
] == NULL
)
223 if (strncmp(wks
[sap
], service_name
, service_name_len
) == 0)
231 struct nfc_llcp_sock
*nfc_llcp_sock_from_sn(struct nfc_llcp_local
*local
,
232 u8
*sn
, size_t sn_len
)
235 struct hlist_node
*node
;
236 struct nfc_llcp_sock
*llcp_sock
, *tmp_sock
;
238 pr_debug("sn %zd %p\n", sn_len
, sn
);
240 if (sn
== NULL
|| sn_len
== 0)
243 read_lock(&local
->sockets
.lock
);
247 sk_for_each(sk
, node
, &local
->sockets
.head
) {
248 tmp_sock
= nfc_llcp_sock(sk
);
250 pr_debug("llcp sock %p\n", tmp_sock
);
252 if (tmp_sock
->sk
.sk_state
!= LLCP_LISTEN
)
255 if (tmp_sock
->service_name
== NULL
||
256 tmp_sock
->service_name_len
== 0)
259 if (tmp_sock
->service_name_len
!= sn_len
)
262 if (memcmp(sn
, tmp_sock
->service_name
, sn_len
) == 0) {
263 llcp_sock
= tmp_sock
;
268 read_unlock(&local
->sockets
.lock
);
270 pr_debug("Found llcp sock %p\n", llcp_sock
);
275 u8
nfc_llcp_get_sdp_ssap(struct nfc_llcp_local
*local
,
276 struct nfc_llcp_sock
*sock
)
278 mutex_lock(&local
->sdp_lock
);
280 if (sock
->service_name
!= NULL
&& sock
->service_name_len
> 0) {
281 int ssap
= nfc_llcp_wks_sap(sock
->service_name
,
282 sock
->service_name_len
);
285 pr_debug("WKS %d\n", ssap
);
287 /* This is a WKS, let's check if it's free */
288 if (local
->local_wks
& BIT(ssap
)) {
289 mutex_unlock(&local
->sdp_lock
);
294 set_bit(ssap
, &local
->local_wks
);
295 mutex_unlock(&local
->sdp_lock
);
301 * Check if there already is a non WKS socket bound
302 * to this service name.
304 if (nfc_llcp_sock_from_sn(local
, sock
->service_name
,
305 sock
->service_name_len
) != NULL
) {
306 mutex_unlock(&local
->sdp_lock
);
311 mutex_unlock(&local
->sdp_lock
);
313 return LLCP_SDP_UNBOUND
;
315 } else if (sock
->ssap
!= 0 && sock
->ssap
< LLCP_WKS_NUM_SAP
) {
316 if (!test_bit(sock
->ssap
, &local
->local_wks
)) {
317 set_bit(sock
->ssap
, &local
->local_wks
);
318 mutex_unlock(&local
->sdp_lock
);
324 mutex_unlock(&local
->sdp_lock
);
329 u8
nfc_llcp_get_local_ssap(struct nfc_llcp_local
*local
)
333 mutex_lock(&local
->sdp_lock
);
335 local_ssap
= find_first_zero_bit(&local
->local_sap
, LLCP_LOCAL_NUM_SAP
);
336 if (local_ssap
== LLCP_LOCAL_NUM_SAP
) {
337 mutex_unlock(&local
->sdp_lock
);
341 set_bit(local_ssap
, &local
->local_sap
);
343 mutex_unlock(&local
->sdp_lock
);
345 return local_ssap
+ LLCP_LOCAL_SAP_OFFSET
;
348 void nfc_llcp_put_ssap(struct nfc_llcp_local
*local
, u8 ssap
)
353 if (ssap
< LLCP_WKS_NUM_SAP
) {
355 sdp
= &local
->local_wks
;
356 } else if (ssap
< LLCP_LOCAL_NUM_SAP
) {
357 atomic_t
*client_cnt
;
359 local_ssap
= ssap
- LLCP_WKS_NUM_SAP
;
360 sdp
= &local
->local_sdp
;
361 client_cnt
= &local
->local_sdp_cnt
[local_ssap
];
363 pr_debug("%d clients\n", atomic_read(client_cnt
));
365 mutex_lock(&local
->sdp_lock
);
367 if (atomic_dec_and_test(client_cnt
)) {
368 struct nfc_llcp_sock
*l_sock
;
370 pr_debug("No more clients for SAP %d\n", ssap
);
372 clear_bit(local_ssap
, sdp
);
374 /* Find the listening sock and set it back to UNBOUND */
375 l_sock
= nfc_llcp_sock_get(local
, ssap
, LLCP_SAP_SDP
);
377 l_sock
->ssap
= LLCP_SDP_UNBOUND
;
378 nfc_llcp_sock_put(l_sock
);
382 mutex_unlock(&local
->sdp_lock
);
385 } else if (ssap
< LLCP_MAX_SAP
) {
386 local_ssap
= ssap
- LLCP_LOCAL_NUM_SAP
;
387 sdp
= &local
->local_sap
;
392 mutex_lock(&local
->sdp_lock
);
394 clear_bit(local_ssap
, sdp
);
396 mutex_unlock(&local
->sdp_lock
);
399 static u8
nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local
*local
)
403 mutex_lock(&local
->sdp_lock
);
405 ssap
= find_first_zero_bit(&local
->local_sdp
, LLCP_SDP_NUM_SAP
);
406 if (ssap
== LLCP_SDP_NUM_SAP
) {
407 mutex_unlock(&local
->sdp_lock
);
412 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP
+ ssap
);
414 set_bit(ssap
, &local
->local_sdp
);
416 mutex_unlock(&local
->sdp_lock
);
418 return LLCP_WKS_NUM_SAP
+ ssap
;
421 static int nfc_llcp_build_gb(struct nfc_llcp_local
*local
)
423 u8
*gb_cur
, *version_tlv
, version
, version_length
;
424 u8
*lto_tlv
, lto
, lto_length
;
425 u8
*wks_tlv
, wks_length
;
426 u8
*miux_tlv
, miux_length
;
431 version
= LLCP_VERSION_11
;
432 version_tlv
= nfc_llcp_build_tlv(LLCP_TLV_VERSION
, &version
,
434 gb_len
+= version_length
;
438 lto_tlv
= nfc_llcp_build_tlv(LLCP_TLV_LTO
, <o
, 1, <o_length
);
439 gb_len
+= lto_length
;
441 pr_debug("Local wks 0x%lx\n", local
->local_wks
);
442 wks_tlv
= nfc_llcp_build_tlv(LLCP_TLV_WKS
, (u8
*)&local
->local_wks
, 2,
444 gb_len
+= wks_length
;
446 miux
= cpu_to_be16(LLCP_MAX_MIUX
);
447 miux_tlv
= nfc_llcp_build_tlv(LLCP_TLV_MIUX
, (u8
*)&miux
, 0,
449 gb_len
+= miux_length
;
451 gb_len
+= ARRAY_SIZE(llcp_magic
);
453 if (gb_len
> NFC_MAX_GT_LEN
) {
460 memcpy(gb_cur
, llcp_magic
, ARRAY_SIZE(llcp_magic
));
461 gb_cur
+= ARRAY_SIZE(llcp_magic
);
463 memcpy(gb_cur
, version_tlv
, version_length
);
464 gb_cur
+= version_length
;
466 memcpy(gb_cur
, lto_tlv
, lto_length
);
467 gb_cur
+= lto_length
;
469 memcpy(gb_cur
, wks_tlv
, wks_length
);
470 gb_cur
+= wks_length
;
472 memcpy(gb_cur
, miux_tlv
, miux_length
);
473 gb_cur
+= miux_length
;
475 local
->gb_len
= gb_len
;
486 u8
*nfc_llcp_general_bytes(struct nfc_dev
*dev
, size_t *general_bytes_len
)
488 struct nfc_llcp_local
*local
;
490 local
= nfc_llcp_find_local(dev
);
492 *general_bytes_len
= 0;
496 nfc_llcp_build_gb(local
);
498 *general_bytes_len
= local
->gb_len
;
503 int nfc_llcp_set_remote_gb(struct nfc_dev
*dev
, u8
*gb
, u8 gb_len
)
505 struct nfc_llcp_local
*local
= nfc_llcp_find_local(dev
);
508 pr_err("No LLCP device\n");
512 memset(local
->remote_gb
, 0, NFC_MAX_GT_LEN
);
513 memcpy(local
->remote_gb
, gb
, gb_len
);
514 local
->remote_gb_len
= gb_len
;
516 if (local
->remote_gb
== NULL
|| local
->remote_gb_len
== 0)
519 if (memcmp(local
->remote_gb
, llcp_magic
, 3)) {
520 pr_err("MAC does not support LLCP\n");
524 return nfc_llcp_parse_gb_tlv(local
,
525 &local
->remote_gb
[3],
526 local
->remote_gb_len
- 3);
529 static u8
nfc_llcp_dsap(struct sk_buff
*pdu
)
531 return (pdu
->data
[0] & 0xfc) >> 2;
534 static u8
nfc_llcp_ptype(struct sk_buff
*pdu
)
536 return ((pdu
->data
[0] & 0x03) << 2) | ((pdu
->data
[1] & 0xc0) >> 6);
539 static u8
nfc_llcp_ssap(struct sk_buff
*pdu
)
541 return pdu
->data
[1] & 0x3f;
544 static u8
nfc_llcp_ns(struct sk_buff
*pdu
)
546 return pdu
->data
[2] >> 4;
549 static u8
nfc_llcp_nr(struct sk_buff
*pdu
)
551 return pdu
->data
[2] & 0xf;
554 static void nfc_llcp_set_nrns(struct nfc_llcp_sock
*sock
, struct sk_buff
*pdu
)
556 pdu
->data
[2] = (sock
->send_n
<< 4) | (sock
->recv_n
);
557 sock
->send_n
= (sock
->send_n
+ 1) % 16;
558 sock
->recv_ack_n
= (sock
->recv_n
- 1) % 16;
561 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local
*local
,
562 struct sk_buff
*skb
, u8 direction
)
564 struct hlist_node
*node
;
565 struct sk_buff
*skb_copy
= NULL
, *nskb
;
569 read_lock(&local
->raw_sockets
.lock
);
571 sk_for_each(sk
, node
, &local
->raw_sockets
.head
) {
572 if (sk
->sk_state
!= LLCP_BOUND
)
575 if (skb_copy
== NULL
) {
576 skb_copy
= __pskb_copy(skb
, NFC_LLCP_RAW_HEADER_SIZE
,
579 if (skb_copy
== NULL
)
582 data
= skb_push(skb_copy
, NFC_LLCP_RAW_HEADER_SIZE
);
584 data
[0] = local
->dev
? local
->dev
->idx
: 0xFF;
588 nskb
= skb_clone(skb_copy
, GFP_ATOMIC
);
592 if (sock_queue_rcv_skb(sk
, nskb
))
596 read_unlock(&local
->raw_sockets
.lock
);
601 static void nfc_llcp_tx_work(struct work_struct
*work
)
603 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
607 struct nfc_llcp_sock
*llcp_sock
;
609 skb
= skb_dequeue(&local
->tx_queue
);
612 llcp_sock
= nfc_llcp_sock(sk
);
613 if (llcp_sock
!= NULL
) {
616 pr_debug("Sending pending skb\n");
617 print_hex_dump(KERN_DEBUG
, "LLCP Tx: ",
618 DUMP_PREFIX_OFFSET
, 16, 1,
619 skb
->data
, skb
->len
, true);
621 nfc_llcp_send_to_raw_sock(local
, skb
,
622 NFC_LLCP_DIRECTION_TX
);
624 ret
= nfc_data_exchange(local
->dev
, local
->target_idx
,
625 skb
, nfc_llcp_recv
, local
);
627 if (!ret
&& nfc_llcp_ptype(skb
) == LLCP_PDU_I
) {
629 skb_queue_tail(&llcp_sock
->tx_pending_queue
,
633 nfc_llcp_send_symm(local
->dev
);
636 nfc_llcp_send_symm(local
->dev
);
639 mod_timer(&local
->link_timer
,
640 jiffies
+ msecs_to_jiffies(2 * local
->remote_lto
));
643 static struct nfc_llcp_sock
*nfc_llcp_connecting_sock_get(struct nfc_llcp_local
*local
,
647 struct nfc_llcp_sock
*llcp_sock
;
648 struct hlist_node
*node
;
650 read_lock(&local
->connecting_sockets
.lock
);
652 sk_for_each(sk
, node
, &local
->connecting_sockets
.head
) {
653 llcp_sock
= nfc_llcp_sock(sk
);
655 if (llcp_sock
->ssap
== ssap
) {
656 sock_hold(&llcp_sock
->sk
);
664 read_unlock(&local
->connecting_sockets
.lock
);
669 static struct nfc_llcp_sock
*nfc_llcp_sock_get_sn(struct nfc_llcp_local
*local
,
670 u8
*sn
, size_t sn_len
)
672 struct nfc_llcp_sock
*llcp_sock
;
674 llcp_sock
= nfc_llcp_sock_from_sn(local
, sn
, sn_len
);
676 if (llcp_sock
== NULL
)
679 sock_hold(&llcp_sock
->sk
);
684 static u8
*nfc_llcp_connect_sn(struct sk_buff
*skb
, size_t *sn_len
)
686 u8
*tlv
= &skb
->data
[2], type
, length
;
687 size_t tlv_array_len
= skb
->len
- LLCP_HEADER_SIZE
, offset
= 0;
689 while (offset
< tlv_array_len
) {
693 pr_debug("type 0x%x length %d\n", type
, length
);
695 if (type
== LLCP_TLV_SN
) {
700 offset
+= length
+ 2;
707 static void nfc_llcp_recv_connect(struct nfc_llcp_local
*local
,
710 struct sock
*new_sk
, *parent
;
711 struct nfc_llcp_sock
*sock
, *new_sock
;
712 u8 dsap
, ssap
, reason
;
714 dsap
= nfc_llcp_dsap(skb
);
715 ssap
= nfc_llcp_ssap(skb
);
717 pr_debug("%d %d\n", dsap
, ssap
);
719 if (dsap
!= LLCP_SAP_SDP
) {
720 sock
= nfc_llcp_sock_get(local
, dsap
, LLCP_SAP_SDP
);
721 if (sock
== NULL
|| sock
->sk
.sk_state
!= LLCP_LISTEN
) {
722 reason
= LLCP_DM_NOBOUND
;
729 sn
= nfc_llcp_connect_sn(skb
, &sn_len
);
731 reason
= LLCP_DM_NOBOUND
;
735 pr_debug("Service name length %zu\n", sn_len
);
737 sock
= nfc_llcp_sock_get_sn(local
, sn
, sn_len
);
739 reason
= LLCP_DM_NOBOUND
;
744 lock_sock(&sock
->sk
);
748 if (sk_acceptq_is_full(parent
)) {
749 reason
= LLCP_DM_REJ
;
750 release_sock(&sock
->sk
);
755 if (sock
->ssap
== LLCP_SDP_UNBOUND
) {
756 u8 ssap
= nfc_llcp_reserve_sdp_ssap(local
);
758 pr_debug("First client, reserving %d\n", ssap
);
760 if (ssap
== LLCP_SAP_MAX
) {
761 reason
= LLCP_DM_REJ
;
762 release_sock(&sock
->sk
);
770 new_sk
= nfc_llcp_sock_alloc(NULL
, parent
->sk_type
, GFP_ATOMIC
);
771 if (new_sk
== NULL
) {
772 reason
= LLCP_DM_REJ
;
773 release_sock(&sock
->sk
);
778 new_sock
= nfc_llcp_sock(new_sk
);
779 new_sock
->dev
= local
->dev
;
780 new_sock
->local
= nfc_llcp_local_get(local
);
781 new_sock
->miu
= local
->remote_miu
;
782 new_sock
->nfc_protocol
= sock
->nfc_protocol
;
783 new_sock
->dsap
= ssap
;
784 new_sock
->target_idx
= local
->target_idx
;
785 new_sock
->parent
= parent
;
786 new_sock
->ssap
= sock
->ssap
;
787 if (sock
->ssap
< LLCP_LOCAL_NUM_SAP
&& sock
->ssap
>= LLCP_WKS_NUM_SAP
) {
788 atomic_t
*client_count
;
790 pr_debug("reserved_ssap %d for %p\n", sock
->ssap
, new_sock
);
793 &local
->local_sdp_cnt
[sock
->ssap
- LLCP_WKS_NUM_SAP
];
795 atomic_inc(client_count
);
796 new_sock
->reserved_ssap
= sock
->ssap
;
799 nfc_llcp_parse_connection_tlv(new_sock
, &skb
->data
[LLCP_HEADER_SIZE
],
800 skb
->len
- LLCP_HEADER_SIZE
);
802 pr_debug("new sock %p sk %p\n", new_sock
, &new_sock
->sk
);
804 nfc_llcp_sock_link(&local
->sockets
, new_sk
);
806 nfc_llcp_accept_enqueue(&sock
->sk
, new_sk
);
808 nfc_get_device(local
->dev
->idx
);
810 new_sk
->sk_state
= LLCP_CONNECTED
;
812 /* Wake the listening processes */
813 parent
->sk_data_ready(parent
, 0);
816 nfc_llcp_send_cc(new_sock
);
818 release_sock(&sock
->sk
);
825 nfc_llcp_send_dm(local
, dsap
, ssap
, reason
);
831 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock
*sock
)
834 struct nfc_llcp_local
*local
= sock
->local
;
836 pr_debug("Remote ready %d tx queue len %d remote rw %d",
837 sock
->remote_ready
, skb_queue_len(&sock
->tx_pending_queue
),
840 /* Try to queue some I frames for transmission */
841 while (sock
->remote_ready
&&
842 skb_queue_len(&sock
->tx_pending_queue
) < sock
->rw
) {
845 pdu
= skb_dequeue(&sock
->tx_queue
);
849 /* Update N(S)/N(R) */
850 nfc_llcp_set_nrns(sock
, pdu
);
852 skb_queue_tail(&local
->tx_queue
, pdu
);
859 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local
*local
,
862 struct nfc_llcp_sock
*llcp_sock
;
864 u8 dsap
, ssap
, ptype
, ns
, nr
;
866 ptype
= nfc_llcp_ptype(skb
);
867 dsap
= nfc_llcp_dsap(skb
);
868 ssap
= nfc_llcp_ssap(skb
);
869 ns
= nfc_llcp_ns(skb
);
870 nr
= nfc_llcp_nr(skb
);
872 pr_debug("%d %d R %d S %d\n", dsap
, ssap
, nr
, ns
);
874 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, ssap
);
875 if (llcp_sock
== NULL
) {
876 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_NOCONN
);
882 if (sk
->sk_state
== LLCP_CLOSED
) {
884 nfc_llcp_sock_put(llcp_sock
);
887 /* Pass the payload upstream */
888 if (ptype
== LLCP_PDU_I
) {
889 pr_debug("I frame, queueing on %p\n", &llcp_sock
->sk
);
891 if (ns
== llcp_sock
->recv_n
)
892 llcp_sock
->recv_n
= (llcp_sock
->recv_n
+ 1) % 16;
894 pr_err("Received out of sequence I PDU\n");
896 skb_pull(skb
, LLCP_HEADER_SIZE
+ LLCP_SEQUENCE_SIZE
);
897 if (sock_queue_rcv_skb(&llcp_sock
->sk
, skb
)) {
898 pr_err("receive queue is full\n");
899 skb_queue_head(&llcp_sock
->tx_backlog_queue
, skb
);
903 /* Remove skbs from the pending queue */
904 if (llcp_sock
->send_ack_n
!= nr
) {
905 struct sk_buff
*s
, *tmp
;
907 llcp_sock
->send_ack_n
= nr
;
909 /* Remove and free all skbs until ns == nr */
910 skb_queue_walk_safe(&llcp_sock
->tx_pending_queue
, s
, tmp
) {
911 skb_unlink(s
, &llcp_sock
->tx_pending_queue
);
914 if (nfc_llcp_ns(s
) == nr
)
918 /* Re-queue the remaining skbs for transmission */
919 skb_queue_reverse_walk_safe(&llcp_sock
->tx_pending_queue
,
921 skb_unlink(s
, &llcp_sock
->tx_pending_queue
);
922 skb_queue_head(&local
->tx_queue
, s
);
926 if (ptype
== LLCP_PDU_RR
)
927 llcp_sock
->remote_ready
= true;
928 else if (ptype
== LLCP_PDU_RNR
)
929 llcp_sock
->remote_ready
= false;
931 if (nfc_llcp_queue_i_frames(llcp_sock
) == 0 && ptype
== LLCP_PDU_I
)
932 nfc_llcp_send_rr(llcp_sock
);
935 nfc_llcp_sock_put(llcp_sock
);
938 static void nfc_llcp_recv_disc(struct nfc_llcp_local
*local
,
941 struct nfc_llcp_sock
*llcp_sock
;
945 dsap
= nfc_llcp_dsap(skb
);
946 ssap
= nfc_llcp_ssap(skb
);
948 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, ssap
);
949 if (llcp_sock
== NULL
) {
950 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_NOCONN
);
956 if (sk
->sk_state
== LLCP_CLOSED
) {
958 nfc_llcp_sock_put(llcp_sock
);
961 if (sk
->sk_state
== LLCP_CONNECTED
) {
962 nfc_put_device(local
->dev
);
963 sk
->sk_state
= LLCP_CLOSED
;
964 sk
->sk_state_change(sk
);
967 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_DISC
);
970 nfc_llcp_sock_put(llcp_sock
);
973 static void nfc_llcp_recv_cc(struct nfc_llcp_local
*local
, struct sk_buff
*skb
)
975 struct nfc_llcp_sock
*llcp_sock
;
979 dsap
= nfc_llcp_dsap(skb
);
980 ssap
= nfc_llcp_ssap(skb
);
982 llcp_sock
= nfc_llcp_connecting_sock_get(local
, dsap
);
983 if (llcp_sock
== NULL
) {
984 pr_err("Invalid CC\n");
985 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_NOCONN
);
992 /* Unlink from connecting and link to the client array */
993 nfc_llcp_sock_unlink(&local
->connecting_sockets
, sk
);
994 nfc_llcp_sock_link(&local
->sockets
, sk
);
995 llcp_sock
->dsap
= ssap
;
997 nfc_llcp_parse_connection_tlv(llcp_sock
, &skb
->data
[LLCP_HEADER_SIZE
],
998 skb
->len
- LLCP_HEADER_SIZE
);
1000 sk
->sk_state
= LLCP_CONNECTED
;
1001 sk
->sk_state_change(sk
);
1003 nfc_llcp_sock_put(llcp_sock
);
1006 static void nfc_llcp_recv_dm(struct nfc_llcp_local
*local
, struct sk_buff
*skb
)
1008 struct nfc_llcp_sock
*llcp_sock
;
1010 u8 dsap
, ssap
, reason
;
1012 dsap
= nfc_llcp_dsap(skb
);
1013 ssap
= nfc_llcp_ssap(skb
);
1014 reason
= skb
->data
[2];
1016 pr_debug("%d %d reason %d\n", ssap
, dsap
, reason
);
1019 case LLCP_DM_NOBOUND
:
1021 llcp_sock
= nfc_llcp_connecting_sock_get(local
, dsap
);
1025 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, ssap
);
1029 if (llcp_sock
== NULL
) {
1030 pr_err("Invalid DM\n");
1034 sk
= &llcp_sock
->sk
;
1037 sk
->sk_state
= LLCP_CLOSED
;
1038 sk
->sk_state_change(sk
);
1040 nfc_llcp_sock_put(llcp_sock
);
1045 static void nfc_llcp_rx_work(struct work_struct
*work
)
1047 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
1049 u8 dsap
, ssap
, ptype
;
1050 struct sk_buff
*skb
;
1052 skb
= local
->rx_pending
;
1054 pr_debug("No pending SKB\n");
1058 ptype
= nfc_llcp_ptype(skb
);
1059 dsap
= nfc_llcp_dsap(skb
);
1060 ssap
= nfc_llcp_ssap(skb
);
1062 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype
, dsap
, ssap
);
1064 if (ptype
!= LLCP_PDU_SYMM
)
1065 print_hex_dump(KERN_DEBUG
, "LLCP Rx: ", DUMP_PREFIX_OFFSET
,
1066 16, 1, skb
->data
, skb
->len
, true);
1068 nfc_llcp_send_to_raw_sock(local
, skb
, NFC_LLCP_DIRECTION_RX
);
1075 case LLCP_PDU_CONNECT
:
1076 pr_debug("CONNECT\n");
1077 nfc_llcp_recv_connect(local
, skb
);
1082 nfc_llcp_recv_disc(local
, skb
);
1087 nfc_llcp_recv_cc(local
, skb
);
1092 nfc_llcp_recv_dm(local
, skb
);
1098 pr_debug("I frame\n");
1099 nfc_llcp_recv_hdlc(local
, skb
);
1104 schedule_work(&local
->tx_work
);
1105 kfree_skb(local
->rx_pending
);
1106 local
->rx_pending
= NULL
;
1111 void nfc_llcp_recv(void *data
, struct sk_buff
*skb
, int err
)
1113 struct nfc_llcp_local
*local
= (struct nfc_llcp_local
*) data
;
1115 pr_debug("Received an LLCP PDU\n");
1117 pr_err("err %d\n", err
);
1121 local
->rx_pending
= skb_get(skb
);
1122 del_timer(&local
->link_timer
);
1123 schedule_work(&local
->rx_work
);
1128 int nfc_llcp_data_received(struct nfc_dev
*dev
, struct sk_buff
*skb
)
1130 struct nfc_llcp_local
*local
;
1132 local
= nfc_llcp_find_local(dev
);
1136 local
->rx_pending
= skb_get(skb
);
1137 del_timer(&local
->link_timer
);
1138 schedule_work(&local
->rx_work
);
1143 void nfc_llcp_mac_is_down(struct nfc_dev
*dev
)
1145 struct nfc_llcp_local
*local
;
1147 local
= nfc_llcp_find_local(dev
);
1151 /* Close and purge all existing sockets */
1152 nfc_llcp_socket_release(local
, true);
1155 void nfc_llcp_mac_is_up(struct nfc_dev
*dev
, u32 target_idx
,
1156 u8 comm_mode
, u8 rf_mode
)
1158 struct nfc_llcp_local
*local
;
1160 pr_debug("rf mode %d\n", rf_mode
);
1162 local
= nfc_llcp_find_local(dev
);
1166 local
->target_idx
= target_idx
;
1167 local
->comm_mode
= comm_mode
;
1168 local
->rf_mode
= rf_mode
;
1170 if (rf_mode
== NFC_RF_INITIATOR
) {
1171 pr_debug("Queueing Tx work\n");
1173 schedule_work(&local
->tx_work
);
1175 mod_timer(&local
->link_timer
,
1176 jiffies
+ msecs_to_jiffies(local
->remote_lto
));
1180 int nfc_llcp_register_device(struct nfc_dev
*ndev
)
1182 struct nfc_llcp_local
*local
;
1184 local
= kzalloc(sizeof(struct nfc_llcp_local
), GFP_KERNEL
);
1189 INIT_LIST_HEAD(&local
->list
);
1190 kref_init(&local
->ref
);
1191 mutex_init(&local
->sdp_lock
);
1192 init_timer(&local
->link_timer
);
1193 local
->link_timer
.data
= (unsigned long) local
;
1194 local
->link_timer
.function
= nfc_llcp_symm_timer
;
1196 skb_queue_head_init(&local
->tx_queue
);
1197 INIT_WORK(&local
->tx_work
, nfc_llcp_tx_work
);
1199 local
->rx_pending
= NULL
;
1200 INIT_WORK(&local
->rx_work
, nfc_llcp_rx_work
);
1202 INIT_WORK(&local
->timeout_work
, nfc_llcp_timeout_work
);
1204 rwlock_init(&local
->sockets
.lock
);
1205 rwlock_init(&local
->connecting_sockets
.lock
);
1206 rwlock_init(&local
->raw_sockets
.lock
);
1208 nfc_llcp_build_gb(local
);
1210 local
->remote_miu
= LLCP_DEFAULT_MIU
;
1211 local
->remote_lto
= LLCP_DEFAULT_LTO
;
1213 list_add(&local
->list
, &llcp_devices
);
1218 void nfc_llcp_unregister_device(struct nfc_dev
*dev
)
1220 struct nfc_llcp_local
*local
= nfc_llcp_find_local(dev
);
1222 if (local
== NULL
) {
1223 pr_debug("No such device\n");
1227 nfc_llcp_local_put(local
);
1230 int __init
nfc_llcp_init(void)
1232 INIT_LIST_HEAD(&llcp_devices
);
1234 return nfc_llcp_sock_init();
1237 void nfc_llcp_exit(void)
1239 nfc_llcp_sock_exit();