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