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 static void nfc_llcp_rx_skb(struct nfc_llcp_local
*local
, struct sk_buff
*skb
);
36 void nfc_llcp_sock_link(struct llcp_sock_list
*l
, struct sock
*sk
)
39 sk_add_node(sk
, &l
->head
);
40 write_unlock(&l
->lock
);
43 void nfc_llcp_sock_unlink(struct llcp_sock_list
*l
, struct sock
*sk
)
47 write_unlock(&l
->lock
);
50 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock
*sock
)
52 sock
->remote_rw
= LLCP_DEFAULT_RW
;
53 sock
->remote_miu
= LLCP_MAX_MIU
+ 1;
56 static void nfc_llcp_socket_purge(struct nfc_llcp_sock
*sock
)
58 struct nfc_llcp_local
*local
= sock
->local
;
59 struct sk_buff
*s
, *tmp
;
61 pr_debug("%p\n", &sock
->sk
);
63 skb_queue_purge(&sock
->tx_queue
);
64 skb_queue_purge(&sock
->tx_pending_queue
);
69 /* Search for local pending SKBs that are related to this socket */
70 skb_queue_walk_safe(&local
->tx_queue
, s
, tmp
) {
71 if (s
->sk
!= &sock
->sk
)
74 skb_unlink(s
, &local
->tx_queue
);
79 static void nfc_llcp_socket_release(struct nfc_llcp_local
*local
, bool device
,
83 struct hlist_node
*tmp
;
84 struct nfc_llcp_sock
*llcp_sock
;
86 skb_queue_purge(&local
->tx_queue
);
88 write_lock(&local
->sockets
.lock
);
90 sk_for_each_safe(sk
, tmp
, &local
->sockets
.head
) {
91 llcp_sock
= nfc_llcp_sock(sk
);
95 nfc_llcp_socket_purge(llcp_sock
);
97 if (sk
->sk_state
== LLCP_CONNECTED
)
98 nfc_put_device(llcp_sock
->dev
);
100 if (sk
->sk_state
== LLCP_LISTEN
) {
101 struct nfc_llcp_sock
*lsk
, *n
;
102 struct sock
*accept_sk
;
104 list_for_each_entry_safe(lsk
, n
,
105 &llcp_sock
->accept_queue
,
107 accept_sk
= &lsk
->sk
;
108 bh_lock_sock(accept_sk
);
110 nfc_llcp_accept_unlink(accept_sk
);
113 accept_sk
->sk_err
= err
;
114 accept_sk
->sk_state
= LLCP_CLOSED
;
115 accept_sk
->sk_state_change(sk
);
117 bh_unlock_sock(accept_sk
);
123 sk
->sk_state
= LLCP_CLOSED
;
124 sk
->sk_state_change(sk
);
128 sk_del_node_init(sk
);
131 write_unlock(&local
->sockets
.lock
);
133 /* If we still have a device, we keep the RAW sockets alive */
137 write_lock(&local
->raw_sockets
.lock
);
139 sk_for_each_safe(sk
, tmp
, &local
->raw_sockets
.head
) {
140 llcp_sock
= nfc_llcp_sock(sk
);
144 nfc_llcp_socket_purge(llcp_sock
);
148 sk
->sk_state
= LLCP_CLOSED
;
149 sk
->sk_state_change(sk
);
153 sk_del_node_init(sk
);
156 write_unlock(&local
->raw_sockets
.lock
);
159 struct nfc_llcp_local
*nfc_llcp_local_get(struct nfc_llcp_local
*local
)
161 kref_get(&local
->ref
);
166 static void local_cleanup(struct nfc_llcp_local
*local
)
168 nfc_llcp_socket_release(local
, false, ENXIO
);
169 del_timer_sync(&local
->link_timer
);
170 skb_queue_purge(&local
->tx_queue
);
171 cancel_work_sync(&local
->tx_work
);
172 cancel_work_sync(&local
->rx_work
);
173 cancel_work_sync(&local
->timeout_work
);
174 kfree_skb(local
->rx_pending
);
175 del_timer_sync(&local
->sdreq_timer
);
176 cancel_work_sync(&local
->sdreq_timeout_work
);
177 nfc_llcp_free_sdp_tlv_list(&local
->pending_sdreqs
);
180 static void local_release(struct kref
*ref
)
182 struct nfc_llcp_local
*local
;
184 local
= container_of(ref
, struct nfc_llcp_local
, ref
);
186 list_del(&local
->list
);
187 local_cleanup(local
);
191 int nfc_llcp_local_put(struct nfc_llcp_local
*local
)
196 return kref_put(&local
->ref
, local_release
);
199 static struct nfc_llcp_sock
*nfc_llcp_sock_get(struct nfc_llcp_local
*local
,
203 struct nfc_llcp_sock
*llcp_sock
, *tmp_sock
;
205 pr_debug("ssap dsap %d %d\n", ssap
, dsap
);
207 if (ssap
== 0 && dsap
== 0)
210 read_lock(&local
->sockets
.lock
);
214 sk_for_each(sk
, &local
->sockets
.head
) {
215 tmp_sock
= nfc_llcp_sock(sk
);
217 if (tmp_sock
->ssap
== ssap
&& tmp_sock
->dsap
== dsap
) {
218 llcp_sock
= tmp_sock
;
223 read_unlock(&local
->sockets
.lock
);
225 if (llcp_sock
== NULL
)
228 sock_hold(&llcp_sock
->sk
);
233 static void nfc_llcp_sock_put(struct nfc_llcp_sock
*sock
)
238 static void nfc_llcp_timeout_work(struct work_struct
*work
)
240 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
243 nfc_dep_link_down(local
->dev
);
246 static void nfc_llcp_symm_timer(unsigned long data
)
248 struct nfc_llcp_local
*local
= (struct nfc_llcp_local
*) data
;
250 pr_err("SYMM timeout\n");
252 schedule_work(&local
->timeout_work
);
255 static void nfc_llcp_sdreq_timeout_work(struct work_struct
*work
)
258 HLIST_HEAD(nl_sdres_list
);
259 struct hlist_node
*n
;
260 struct nfc_llcp_sdp_tlv
*sdp
;
261 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
264 mutex_lock(&local
->sdreq_lock
);
266 time
= jiffies
- msecs_to_jiffies(3 * local
->remote_lto
);
268 hlist_for_each_entry_safe(sdp
, n
, &local
->pending_sdreqs
, node
) {
269 if (time_after(sdp
->time
, time
))
272 sdp
->sap
= LLCP_SDP_UNBOUND
;
274 hlist_del(&sdp
->node
);
276 hlist_add_head(&sdp
->node
, &nl_sdres_list
);
279 if (!hlist_empty(&local
->pending_sdreqs
))
280 mod_timer(&local
->sdreq_timer
,
281 jiffies
+ msecs_to_jiffies(3 * local
->remote_lto
));
283 mutex_unlock(&local
->sdreq_lock
);
285 if (!hlist_empty(&nl_sdres_list
))
286 nfc_genl_llc_send_sdres(local
->dev
, &nl_sdres_list
);
289 static void nfc_llcp_sdreq_timer(unsigned long data
)
291 struct nfc_llcp_local
*local
= (struct nfc_llcp_local
*) data
;
293 schedule_work(&local
->sdreq_timeout_work
);
296 struct nfc_llcp_local
*nfc_llcp_find_local(struct nfc_dev
*dev
)
298 struct nfc_llcp_local
*local
, *n
;
300 list_for_each_entry_safe(local
, n
, &llcp_devices
, list
)
301 if (local
->dev
== dev
)
304 pr_debug("No device found\n");
309 static char *wks
[] = {
317 static int nfc_llcp_wks_sap(char *service_name
, size_t service_name_len
)
321 pr_debug("%s\n", service_name
);
323 if (service_name
== NULL
)
326 num_wks
= ARRAY_SIZE(wks
);
328 for (sap
= 0; sap
< num_wks
; sap
++) {
329 if (wks
[sap
] == NULL
)
332 if (strncmp(wks
[sap
], service_name
, service_name_len
) == 0)
340 struct nfc_llcp_sock
*nfc_llcp_sock_from_sn(struct nfc_llcp_local
*local
,
341 u8
*sn
, size_t sn_len
)
344 struct nfc_llcp_sock
*llcp_sock
, *tmp_sock
;
346 pr_debug("sn %zd %p\n", sn_len
, sn
);
348 if (sn
== NULL
|| sn_len
== 0)
351 read_lock(&local
->sockets
.lock
);
355 sk_for_each(sk
, &local
->sockets
.head
) {
356 tmp_sock
= nfc_llcp_sock(sk
);
358 pr_debug("llcp sock %p\n", tmp_sock
);
360 if (tmp_sock
->sk
.sk_type
== SOCK_STREAM
&&
361 tmp_sock
->sk
.sk_state
!= LLCP_LISTEN
)
364 if (tmp_sock
->sk
.sk_type
== SOCK_DGRAM
&&
365 tmp_sock
->sk
.sk_state
!= LLCP_BOUND
)
368 if (tmp_sock
->service_name
== NULL
||
369 tmp_sock
->service_name_len
== 0)
372 if (tmp_sock
->service_name_len
!= sn_len
)
375 if (memcmp(sn
, tmp_sock
->service_name
, sn_len
) == 0) {
376 llcp_sock
= tmp_sock
;
381 read_unlock(&local
->sockets
.lock
);
383 pr_debug("Found llcp sock %p\n", llcp_sock
);
388 u8
nfc_llcp_get_sdp_ssap(struct nfc_llcp_local
*local
,
389 struct nfc_llcp_sock
*sock
)
391 mutex_lock(&local
->sdp_lock
);
393 if (sock
->service_name
!= NULL
&& sock
->service_name_len
> 0) {
394 int ssap
= nfc_llcp_wks_sap(sock
->service_name
,
395 sock
->service_name_len
);
398 pr_debug("WKS %d\n", ssap
);
400 /* This is a WKS, let's check if it's free */
401 if (local
->local_wks
& BIT(ssap
)) {
402 mutex_unlock(&local
->sdp_lock
);
407 set_bit(ssap
, &local
->local_wks
);
408 mutex_unlock(&local
->sdp_lock
);
414 * Check if there already is a non WKS socket bound
415 * to this service name.
417 if (nfc_llcp_sock_from_sn(local
, sock
->service_name
,
418 sock
->service_name_len
) != NULL
) {
419 mutex_unlock(&local
->sdp_lock
);
424 mutex_unlock(&local
->sdp_lock
);
426 return LLCP_SDP_UNBOUND
;
428 } else if (sock
->ssap
!= 0 && sock
->ssap
< LLCP_WKS_NUM_SAP
) {
429 if (!test_bit(sock
->ssap
, &local
->local_wks
)) {
430 set_bit(sock
->ssap
, &local
->local_wks
);
431 mutex_unlock(&local
->sdp_lock
);
437 mutex_unlock(&local
->sdp_lock
);
442 u8
nfc_llcp_get_local_ssap(struct nfc_llcp_local
*local
)
446 mutex_lock(&local
->sdp_lock
);
448 local_ssap
= find_first_zero_bit(&local
->local_sap
, LLCP_LOCAL_NUM_SAP
);
449 if (local_ssap
== LLCP_LOCAL_NUM_SAP
) {
450 mutex_unlock(&local
->sdp_lock
);
454 set_bit(local_ssap
, &local
->local_sap
);
456 mutex_unlock(&local
->sdp_lock
);
458 return local_ssap
+ LLCP_LOCAL_SAP_OFFSET
;
461 void nfc_llcp_put_ssap(struct nfc_llcp_local
*local
, u8 ssap
)
466 if (ssap
< LLCP_WKS_NUM_SAP
) {
468 sdp
= &local
->local_wks
;
469 } else if (ssap
< LLCP_LOCAL_NUM_SAP
) {
470 atomic_t
*client_cnt
;
472 local_ssap
= ssap
- LLCP_WKS_NUM_SAP
;
473 sdp
= &local
->local_sdp
;
474 client_cnt
= &local
->local_sdp_cnt
[local_ssap
];
476 pr_debug("%d clients\n", atomic_read(client_cnt
));
478 mutex_lock(&local
->sdp_lock
);
480 if (atomic_dec_and_test(client_cnt
)) {
481 struct nfc_llcp_sock
*l_sock
;
483 pr_debug("No more clients for SAP %d\n", ssap
);
485 clear_bit(local_ssap
, sdp
);
487 /* Find the listening sock and set it back to UNBOUND */
488 l_sock
= nfc_llcp_sock_get(local
, ssap
, LLCP_SAP_SDP
);
490 l_sock
->ssap
= LLCP_SDP_UNBOUND
;
491 nfc_llcp_sock_put(l_sock
);
495 mutex_unlock(&local
->sdp_lock
);
498 } else if (ssap
< LLCP_MAX_SAP
) {
499 local_ssap
= ssap
- LLCP_LOCAL_NUM_SAP
;
500 sdp
= &local
->local_sap
;
505 mutex_lock(&local
->sdp_lock
);
507 clear_bit(local_ssap
, sdp
);
509 mutex_unlock(&local
->sdp_lock
);
512 static u8
nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local
*local
)
516 mutex_lock(&local
->sdp_lock
);
518 ssap
= find_first_zero_bit(&local
->local_sdp
, LLCP_SDP_NUM_SAP
);
519 if (ssap
== LLCP_SDP_NUM_SAP
) {
520 mutex_unlock(&local
->sdp_lock
);
525 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP
+ ssap
);
527 set_bit(ssap
, &local
->local_sdp
);
529 mutex_unlock(&local
->sdp_lock
);
531 return LLCP_WKS_NUM_SAP
+ ssap
;
534 static int nfc_llcp_build_gb(struct nfc_llcp_local
*local
)
536 u8
*gb_cur
, *version_tlv
, version
, version_length
;
537 u8
*lto_tlv
, lto_length
;
538 u8
*wks_tlv
, wks_length
;
539 u8
*miux_tlv
, miux_length
;
543 version
= LLCP_VERSION_11
;
544 version_tlv
= nfc_llcp_build_tlv(LLCP_TLV_VERSION
, &version
,
546 gb_len
+= version_length
;
548 lto_tlv
= nfc_llcp_build_tlv(LLCP_TLV_LTO
, &local
->lto
, 1, <o_length
);
549 gb_len
+= lto_length
;
551 pr_debug("Local wks 0x%lx\n", local
->local_wks
);
552 wks_tlv
= nfc_llcp_build_tlv(LLCP_TLV_WKS
, (u8
*)&local
->local_wks
, 2,
554 gb_len
+= wks_length
;
556 miux_tlv
= nfc_llcp_build_tlv(LLCP_TLV_MIUX
, (u8
*)&local
->miux
, 0,
558 gb_len
+= miux_length
;
560 gb_len
+= ARRAY_SIZE(llcp_magic
);
562 if (gb_len
> NFC_MAX_GT_LEN
) {
569 memcpy(gb_cur
, llcp_magic
, ARRAY_SIZE(llcp_magic
));
570 gb_cur
+= ARRAY_SIZE(llcp_magic
);
572 memcpy(gb_cur
, version_tlv
, version_length
);
573 gb_cur
+= version_length
;
575 memcpy(gb_cur
, lto_tlv
, lto_length
);
576 gb_cur
+= lto_length
;
578 memcpy(gb_cur
, wks_tlv
, wks_length
);
579 gb_cur
+= wks_length
;
581 memcpy(gb_cur
, miux_tlv
, miux_length
);
582 gb_cur
+= miux_length
;
584 local
->gb_len
= gb_len
;
595 u8
*nfc_llcp_general_bytes(struct nfc_dev
*dev
, size_t *general_bytes_len
)
597 struct nfc_llcp_local
*local
;
599 local
= nfc_llcp_find_local(dev
);
601 *general_bytes_len
= 0;
605 nfc_llcp_build_gb(local
);
607 *general_bytes_len
= local
->gb_len
;
612 int nfc_llcp_set_remote_gb(struct nfc_dev
*dev
, u8
*gb
, u8 gb_len
)
614 struct nfc_llcp_local
*local
= nfc_llcp_find_local(dev
);
617 pr_err("No LLCP device\n");
623 memset(local
->remote_gb
, 0, NFC_MAX_GT_LEN
);
624 memcpy(local
->remote_gb
, gb
, gb_len
);
625 local
->remote_gb_len
= gb_len
;
627 if (memcmp(local
->remote_gb
, llcp_magic
, 3)) {
628 pr_err("MAC does not support LLCP\n");
632 return nfc_llcp_parse_gb_tlv(local
,
633 &local
->remote_gb
[3],
634 local
->remote_gb_len
- 3);
637 static u8
nfc_llcp_dsap(struct sk_buff
*pdu
)
639 return (pdu
->data
[0] & 0xfc) >> 2;
642 static u8
nfc_llcp_ptype(struct sk_buff
*pdu
)
644 return ((pdu
->data
[0] & 0x03) << 2) | ((pdu
->data
[1] & 0xc0) >> 6);
647 static u8
nfc_llcp_ssap(struct sk_buff
*pdu
)
649 return pdu
->data
[1] & 0x3f;
652 static u8
nfc_llcp_ns(struct sk_buff
*pdu
)
654 return pdu
->data
[2] >> 4;
657 static u8
nfc_llcp_nr(struct sk_buff
*pdu
)
659 return pdu
->data
[2] & 0xf;
662 static void nfc_llcp_set_nrns(struct nfc_llcp_sock
*sock
, struct sk_buff
*pdu
)
664 pdu
->data
[2] = (sock
->send_n
<< 4) | (sock
->recv_n
);
665 sock
->send_n
= (sock
->send_n
+ 1) % 16;
666 sock
->recv_ack_n
= (sock
->recv_n
- 1) % 16;
669 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local
*local
,
670 struct sk_buff
*skb
, u8 direction
)
672 struct sk_buff
*skb_copy
= NULL
, *nskb
;
676 read_lock(&local
->raw_sockets
.lock
);
678 sk_for_each(sk
, &local
->raw_sockets
.head
) {
679 if (sk
->sk_state
!= LLCP_BOUND
)
682 if (skb_copy
== NULL
) {
683 skb_copy
= __pskb_copy(skb
, NFC_LLCP_RAW_HEADER_SIZE
,
686 if (skb_copy
== NULL
)
689 data
= skb_push(skb_copy
, NFC_LLCP_RAW_HEADER_SIZE
);
691 data
[0] = local
->dev
? local
->dev
->idx
: 0xFF;
695 nskb
= skb_clone(skb_copy
, GFP_ATOMIC
);
699 if (sock_queue_rcv_skb(sk
, nskb
))
703 read_unlock(&local
->raw_sockets
.lock
);
708 static void nfc_llcp_tx_work(struct work_struct
*work
)
710 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
714 struct nfc_llcp_sock
*llcp_sock
;
716 skb
= skb_dequeue(&local
->tx_queue
);
719 llcp_sock
= nfc_llcp_sock(sk
);
721 if (llcp_sock
== NULL
&& nfc_llcp_ptype(skb
) == LLCP_PDU_I
) {
722 nfc_llcp_send_symm(local
->dev
);
724 struct sk_buff
*copy_skb
= NULL
;
725 u8 ptype
= nfc_llcp_ptype(skb
);
728 pr_debug("Sending pending skb\n");
729 print_hex_dump(KERN_DEBUG
, "LLCP Tx: ",
730 DUMP_PREFIX_OFFSET
, 16, 1,
731 skb
->data
, skb
->len
, true);
733 if (ptype
== LLCP_PDU_DISC
&& sk
!= NULL
&&
734 sk
->sk_state
== LLCP_DISCONNECTING
) {
735 nfc_llcp_sock_unlink(&local
->sockets
, sk
);
740 if (ptype
== LLCP_PDU_I
)
741 copy_skb
= skb_copy(skb
, GFP_ATOMIC
);
743 __net_timestamp(skb
);
745 nfc_llcp_send_to_raw_sock(local
, skb
,
746 NFC_LLCP_DIRECTION_TX
);
748 ret
= nfc_data_exchange(local
->dev
, local
->target_idx
,
749 skb
, nfc_llcp_recv
, local
);
756 if (ptype
== LLCP_PDU_I
&& copy_skb
)
757 skb_queue_tail(&llcp_sock
->tx_pending_queue
,
761 nfc_llcp_send_symm(local
->dev
);
765 mod_timer(&local
->link_timer
,
766 jiffies
+ msecs_to_jiffies(2 * local
->remote_lto
));
769 static struct nfc_llcp_sock
*nfc_llcp_connecting_sock_get(struct nfc_llcp_local
*local
,
773 struct nfc_llcp_sock
*llcp_sock
;
775 read_lock(&local
->connecting_sockets
.lock
);
777 sk_for_each(sk
, &local
->connecting_sockets
.head
) {
778 llcp_sock
= nfc_llcp_sock(sk
);
780 if (llcp_sock
->ssap
== ssap
) {
781 sock_hold(&llcp_sock
->sk
);
789 read_unlock(&local
->connecting_sockets
.lock
);
794 static struct nfc_llcp_sock
*nfc_llcp_sock_get_sn(struct nfc_llcp_local
*local
,
795 u8
*sn
, size_t sn_len
)
797 struct nfc_llcp_sock
*llcp_sock
;
799 llcp_sock
= nfc_llcp_sock_from_sn(local
, sn
, sn_len
);
801 if (llcp_sock
== NULL
)
804 sock_hold(&llcp_sock
->sk
);
809 static u8
*nfc_llcp_connect_sn(struct sk_buff
*skb
, size_t *sn_len
)
811 u8
*tlv
= &skb
->data
[2], type
, length
;
812 size_t tlv_array_len
= skb
->len
- LLCP_HEADER_SIZE
, offset
= 0;
814 while (offset
< tlv_array_len
) {
818 pr_debug("type 0x%x length %d\n", type
, length
);
820 if (type
== LLCP_TLV_SN
) {
825 offset
+= length
+ 2;
832 static void nfc_llcp_recv_ui(struct nfc_llcp_local
*local
,
835 struct nfc_llcp_sock
*llcp_sock
;
836 struct nfc_llcp_ui_cb
*ui_cb
;
839 dsap
= nfc_llcp_dsap(skb
);
840 ssap
= nfc_llcp_ssap(skb
);
842 ui_cb
= nfc_llcp_ui_skb_cb(skb
);
846 pr_debug("%d %d\n", dsap
, ssap
);
848 /* We're looking for a bound socket, not a client one */
849 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, LLCP_SAP_SDP
);
850 if (llcp_sock
== NULL
|| llcp_sock
->sk
.sk_type
!= SOCK_DGRAM
)
853 /* There is no sequence with UI frames */
854 skb_pull(skb
, LLCP_HEADER_SIZE
);
855 if (!sock_queue_rcv_skb(&llcp_sock
->sk
, skb
)) {
857 * UI frames will be freed from the socket layer, so we
858 * need to keep them alive until someone receives them.
862 pr_err("Receive queue is full\n");
865 nfc_llcp_sock_put(llcp_sock
);
868 static void nfc_llcp_recv_connect(struct nfc_llcp_local
*local
,
871 struct sock
*new_sk
, *parent
;
872 struct nfc_llcp_sock
*sock
, *new_sock
;
873 u8 dsap
, ssap
, reason
;
875 dsap
= nfc_llcp_dsap(skb
);
876 ssap
= nfc_llcp_ssap(skb
);
878 pr_debug("%d %d\n", dsap
, ssap
);
880 if (dsap
!= LLCP_SAP_SDP
) {
881 sock
= nfc_llcp_sock_get(local
, dsap
, LLCP_SAP_SDP
);
882 if (sock
== NULL
|| sock
->sk
.sk_state
!= LLCP_LISTEN
) {
883 reason
= LLCP_DM_NOBOUND
;
890 sn
= nfc_llcp_connect_sn(skb
, &sn_len
);
892 reason
= LLCP_DM_NOBOUND
;
896 pr_debug("Service name length %zu\n", sn_len
);
898 sock
= nfc_llcp_sock_get_sn(local
, sn
, sn_len
);
900 reason
= LLCP_DM_NOBOUND
;
905 lock_sock(&sock
->sk
);
909 if (sk_acceptq_is_full(parent
)) {
910 reason
= LLCP_DM_REJ
;
911 release_sock(&sock
->sk
);
916 if (sock
->ssap
== LLCP_SDP_UNBOUND
) {
917 u8 ssap
= nfc_llcp_reserve_sdp_ssap(local
);
919 pr_debug("First client, reserving %d\n", ssap
);
921 if (ssap
== LLCP_SAP_MAX
) {
922 reason
= LLCP_DM_REJ
;
923 release_sock(&sock
->sk
);
931 new_sk
= nfc_llcp_sock_alloc(NULL
, parent
->sk_type
, GFP_ATOMIC
);
932 if (new_sk
== NULL
) {
933 reason
= LLCP_DM_REJ
;
934 release_sock(&sock
->sk
);
939 new_sock
= nfc_llcp_sock(new_sk
);
940 new_sock
->dev
= local
->dev
;
941 new_sock
->local
= nfc_llcp_local_get(local
);
942 new_sock
->rw
= sock
->rw
;
943 new_sock
->miux
= sock
->miux
;
944 new_sock
->remote_miu
= local
->remote_miu
;
945 new_sock
->nfc_protocol
= sock
->nfc_protocol
;
946 new_sock
->dsap
= ssap
;
947 new_sock
->target_idx
= local
->target_idx
;
948 new_sock
->parent
= parent
;
949 new_sock
->ssap
= sock
->ssap
;
950 if (sock
->ssap
< LLCP_LOCAL_NUM_SAP
&& sock
->ssap
>= LLCP_WKS_NUM_SAP
) {
951 atomic_t
*client_count
;
953 pr_debug("reserved_ssap %d for %p\n", sock
->ssap
, new_sock
);
956 &local
->local_sdp_cnt
[sock
->ssap
- LLCP_WKS_NUM_SAP
];
958 atomic_inc(client_count
);
959 new_sock
->reserved_ssap
= sock
->ssap
;
962 nfc_llcp_parse_connection_tlv(new_sock
, &skb
->data
[LLCP_HEADER_SIZE
],
963 skb
->len
- LLCP_HEADER_SIZE
);
965 pr_debug("new sock %p sk %p\n", new_sock
, &new_sock
->sk
);
967 nfc_llcp_sock_link(&local
->sockets
, new_sk
);
969 nfc_llcp_accept_enqueue(&sock
->sk
, new_sk
);
971 nfc_get_device(local
->dev
->idx
);
973 new_sk
->sk_state
= LLCP_CONNECTED
;
975 /* Wake the listening processes */
976 parent
->sk_data_ready(parent
, 0);
979 nfc_llcp_send_cc(new_sock
);
981 release_sock(&sock
->sk
);
988 nfc_llcp_send_dm(local
, dsap
, ssap
, reason
);
991 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock
*sock
)
994 struct nfc_llcp_local
*local
= sock
->local
;
996 pr_debug("Remote ready %d tx queue len %d remote rw %d",
997 sock
->remote_ready
, skb_queue_len(&sock
->tx_pending_queue
),
1000 /* Try to queue some I frames for transmission */
1001 while (sock
->remote_ready
&&
1002 skb_queue_len(&sock
->tx_pending_queue
) < sock
->remote_rw
) {
1003 struct sk_buff
*pdu
;
1005 pdu
= skb_dequeue(&sock
->tx_queue
);
1009 /* Update N(S)/N(R) */
1010 nfc_llcp_set_nrns(sock
, pdu
);
1012 skb_queue_tail(&local
->tx_queue
, pdu
);
1019 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local
*local
,
1020 struct sk_buff
*skb
)
1022 struct nfc_llcp_sock
*llcp_sock
;
1024 u8 dsap
, ssap
, ptype
, ns
, nr
;
1026 ptype
= nfc_llcp_ptype(skb
);
1027 dsap
= nfc_llcp_dsap(skb
);
1028 ssap
= nfc_llcp_ssap(skb
);
1029 ns
= nfc_llcp_ns(skb
);
1030 nr
= nfc_llcp_nr(skb
);
1032 pr_debug("%d %d R %d S %d\n", dsap
, ssap
, nr
, ns
);
1034 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, ssap
);
1035 if (llcp_sock
== NULL
) {
1036 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_NOCONN
);
1040 sk
= &llcp_sock
->sk
;
1042 if (sk
->sk_state
== LLCP_CLOSED
) {
1044 nfc_llcp_sock_put(llcp_sock
);
1047 /* Pass the payload upstream */
1048 if (ptype
== LLCP_PDU_I
) {
1049 pr_debug("I frame, queueing on %p\n", &llcp_sock
->sk
);
1051 if (ns
== llcp_sock
->recv_n
)
1052 llcp_sock
->recv_n
= (llcp_sock
->recv_n
+ 1) % 16;
1054 pr_err("Received out of sequence I PDU\n");
1056 skb_pull(skb
, LLCP_HEADER_SIZE
+ LLCP_SEQUENCE_SIZE
);
1057 if (!sock_queue_rcv_skb(&llcp_sock
->sk
, skb
)) {
1059 * I frames will be freed from the socket layer, so we
1060 * need to keep them alive until someone receives them.
1064 pr_err("Receive queue is full\n");
1068 /* Remove skbs from the pending queue */
1069 if (llcp_sock
->send_ack_n
!= nr
) {
1070 struct sk_buff
*s
, *tmp
;
1073 llcp_sock
->send_ack_n
= nr
;
1075 /* Remove and free all skbs until ns == nr */
1076 skb_queue_walk_safe(&llcp_sock
->tx_pending_queue
, s
, tmp
) {
1079 skb_unlink(s
, &llcp_sock
->tx_pending_queue
);
1086 /* Re-queue the remaining skbs for transmission */
1087 skb_queue_reverse_walk_safe(&llcp_sock
->tx_pending_queue
,
1089 skb_unlink(s
, &llcp_sock
->tx_pending_queue
);
1090 skb_queue_head(&local
->tx_queue
, s
);
1094 if (ptype
== LLCP_PDU_RR
)
1095 llcp_sock
->remote_ready
= true;
1096 else if (ptype
== LLCP_PDU_RNR
)
1097 llcp_sock
->remote_ready
= false;
1099 if (nfc_llcp_queue_i_frames(llcp_sock
) == 0 && ptype
== LLCP_PDU_I
)
1100 nfc_llcp_send_rr(llcp_sock
);
1103 nfc_llcp_sock_put(llcp_sock
);
1106 static void nfc_llcp_recv_disc(struct nfc_llcp_local
*local
,
1107 struct sk_buff
*skb
)
1109 struct nfc_llcp_sock
*llcp_sock
;
1113 dsap
= nfc_llcp_dsap(skb
);
1114 ssap
= nfc_llcp_ssap(skb
);
1116 if ((dsap
== 0) && (ssap
== 0)) {
1117 pr_debug("Connection termination");
1118 nfc_dep_link_down(local
->dev
);
1122 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, ssap
);
1123 if (llcp_sock
== NULL
) {
1124 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_NOCONN
);
1128 sk
= &llcp_sock
->sk
;
1131 nfc_llcp_socket_purge(llcp_sock
);
1133 if (sk
->sk_state
== LLCP_CLOSED
) {
1135 nfc_llcp_sock_put(llcp_sock
);
1138 if (sk
->sk_state
== LLCP_CONNECTED
) {
1139 nfc_put_device(local
->dev
);
1140 sk
->sk_state
= LLCP_CLOSED
;
1141 sk
->sk_state_change(sk
);
1144 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_DISC
);
1147 nfc_llcp_sock_put(llcp_sock
);
1150 static void nfc_llcp_recv_cc(struct nfc_llcp_local
*local
, struct sk_buff
*skb
)
1152 struct nfc_llcp_sock
*llcp_sock
;
1156 dsap
= nfc_llcp_dsap(skb
);
1157 ssap
= nfc_llcp_ssap(skb
);
1159 llcp_sock
= nfc_llcp_connecting_sock_get(local
, dsap
);
1160 if (llcp_sock
== NULL
) {
1161 pr_err("Invalid CC\n");
1162 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_NOCONN
);
1167 sk
= &llcp_sock
->sk
;
1169 /* Unlink from connecting and link to the client array */
1170 nfc_llcp_sock_unlink(&local
->connecting_sockets
, sk
);
1171 nfc_llcp_sock_link(&local
->sockets
, sk
);
1172 llcp_sock
->dsap
= ssap
;
1174 nfc_llcp_parse_connection_tlv(llcp_sock
, &skb
->data
[LLCP_HEADER_SIZE
],
1175 skb
->len
- LLCP_HEADER_SIZE
);
1177 sk
->sk_state
= LLCP_CONNECTED
;
1178 sk
->sk_state_change(sk
);
1180 nfc_llcp_sock_put(llcp_sock
);
1183 static void nfc_llcp_recv_dm(struct nfc_llcp_local
*local
, struct sk_buff
*skb
)
1185 struct nfc_llcp_sock
*llcp_sock
;
1187 u8 dsap
, ssap
, reason
;
1189 dsap
= nfc_llcp_dsap(skb
);
1190 ssap
= nfc_llcp_ssap(skb
);
1191 reason
= skb
->data
[2];
1193 pr_debug("%d %d reason %d\n", ssap
, dsap
, reason
);
1196 case LLCP_DM_NOBOUND
:
1198 llcp_sock
= nfc_llcp_connecting_sock_get(local
, dsap
);
1202 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, ssap
);
1206 if (llcp_sock
== NULL
) {
1207 pr_debug("Already closed\n");
1211 sk
= &llcp_sock
->sk
;
1214 sk
->sk_state
= LLCP_CLOSED
;
1215 sk
->sk_state_change(sk
);
1217 nfc_llcp_sock_put(llcp_sock
);
1220 static void nfc_llcp_recv_snl(struct nfc_llcp_local
*local
,
1221 struct sk_buff
*skb
)
1223 struct nfc_llcp_sock
*llcp_sock
;
1224 u8 dsap
, ssap
, *tlv
, type
, length
, tid
, sap
;
1225 u16 tlv_len
, offset
;
1227 size_t service_name_len
;
1228 struct nfc_llcp_sdp_tlv
*sdp
;
1229 HLIST_HEAD(llc_sdres_list
);
1230 size_t sdres_tlvs_len
;
1231 HLIST_HEAD(nl_sdres_list
);
1233 dsap
= nfc_llcp_dsap(skb
);
1234 ssap
= nfc_llcp_ssap(skb
);
1236 pr_debug("%d %d\n", dsap
, ssap
);
1238 if (dsap
!= LLCP_SAP_SDP
|| ssap
!= LLCP_SAP_SDP
) {
1239 pr_err("Wrong SNL SAP\n");
1243 tlv
= &skb
->data
[LLCP_HEADER_SIZE
];
1244 tlv_len
= skb
->len
- LLCP_HEADER_SIZE
;
1248 while (offset
< tlv_len
) {
1253 case LLCP_TLV_SDREQ
:
1255 service_name
= (char *) &tlv
[3];
1256 service_name_len
= length
- 1;
1258 pr_debug("Looking for %.16s\n", service_name
);
1260 if (service_name_len
== strlen("urn:nfc:sn:sdp") &&
1261 !strncmp(service_name
, "urn:nfc:sn:sdp",
1262 service_name_len
)) {
1267 llcp_sock
= nfc_llcp_sock_from_sn(local
, service_name
,
1275 * We found a socket but its ssap has not been reserved
1276 * yet. We need to assign it for good and send a reply.
1277 * The ssap will be freed when the socket is closed.
1279 if (llcp_sock
->ssap
== LLCP_SDP_UNBOUND
) {
1280 atomic_t
*client_count
;
1282 sap
= nfc_llcp_reserve_sdp_ssap(local
);
1284 pr_debug("Reserving %d\n", sap
);
1286 if (sap
== LLCP_SAP_MAX
) {
1292 &local
->local_sdp_cnt
[sap
-
1295 atomic_inc(client_count
);
1297 llcp_sock
->ssap
= sap
;
1298 llcp_sock
->reserved_ssap
= sap
;
1300 sap
= llcp_sock
->ssap
;
1303 pr_debug("%p %d\n", llcp_sock
, sap
);
1306 sdp
= nfc_llcp_build_sdres_tlv(tid
, sap
);
1310 sdres_tlvs_len
+= sdp
->tlv_len
;
1311 hlist_add_head(&sdp
->node
, &llc_sdres_list
);
1314 case LLCP_TLV_SDRES
:
1315 mutex_lock(&local
->sdreq_lock
);
1317 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv
[2]);
1319 hlist_for_each_entry(sdp
, &local
->pending_sdreqs
, node
) {
1320 if (sdp
->tid
!= tlv
[2])
1325 pr_debug("Found: uri=%s, sap=%d\n",
1326 sdp
->uri
, sdp
->sap
);
1328 hlist_del(&sdp
->node
);
1330 hlist_add_head(&sdp
->node
, &nl_sdres_list
);
1335 mutex_unlock(&local
->sdreq_lock
);
1339 pr_err("Invalid SNL tlv value 0x%x\n", type
);
1343 offset
+= length
+ 2;
1348 if (!hlist_empty(&nl_sdres_list
))
1349 nfc_genl_llc_send_sdres(local
->dev
, &nl_sdres_list
);
1351 if (!hlist_empty(&llc_sdres_list
))
1352 nfc_llcp_send_snl_sdres(local
, &llc_sdres_list
, sdres_tlvs_len
);
1355 static void nfc_llcp_recv_agf(struct nfc_llcp_local
*local
, struct sk_buff
*skb
)
1359 struct sk_buff
*new_skb
;
1361 if (skb
->len
<= LLCP_HEADER_SIZE
) {
1362 pr_err("Malformed AGF PDU\n");
1366 skb_pull(skb
, LLCP_HEADER_SIZE
);
1368 while (skb
->len
> LLCP_AGF_PDU_HEADER_SIZE
) {
1369 pdu_len
= skb
->data
[0] << 8 | skb
->data
[1];
1371 skb_pull(skb
, LLCP_AGF_PDU_HEADER_SIZE
);
1373 if (pdu_len
< LLCP_HEADER_SIZE
|| pdu_len
> skb
->len
) {
1374 pr_err("Malformed AGF PDU\n");
1378 ptype
= nfc_llcp_ptype(skb
);
1380 if (ptype
== LLCP_PDU_SYMM
|| ptype
== LLCP_PDU_AGF
)
1383 new_skb
= nfc_alloc_recv_skb(pdu_len
, GFP_KERNEL
);
1384 if (new_skb
== NULL
) {
1385 pr_err("Could not allocate PDU\n");
1389 memcpy(skb_put(new_skb
, pdu_len
), skb
->data
, pdu_len
);
1391 nfc_llcp_rx_skb(local
, new_skb
);
1395 skb_pull(skb
, pdu_len
);
1399 static void nfc_llcp_rx_skb(struct nfc_llcp_local
*local
, struct sk_buff
*skb
)
1401 u8 dsap
, ssap
, ptype
;
1403 ptype
= nfc_llcp_ptype(skb
);
1404 dsap
= nfc_llcp_dsap(skb
);
1405 ssap
= nfc_llcp_ssap(skb
);
1407 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype
, dsap
, ssap
);
1409 if (ptype
!= LLCP_PDU_SYMM
)
1410 print_hex_dump(KERN_DEBUG
, "LLCP Rx: ", DUMP_PREFIX_OFFSET
,
1411 16, 1, skb
->data
, skb
->len
, true);
1420 nfc_llcp_recv_ui(local
, skb
);
1423 case LLCP_PDU_CONNECT
:
1424 pr_debug("CONNECT\n");
1425 nfc_llcp_recv_connect(local
, skb
);
1430 nfc_llcp_recv_disc(local
, skb
);
1435 nfc_llcp_recv_cc(local
, skb
);
1440 nfc_llcp_recv_dm(local
, skb
);
1445 nfc_llcp_recv_snl(local
, skb
);
1451 pr_debug("I frame\n");
1452 nfc_llcp_recv_hdlc(local
, skb
);
1456 pr_debug("AGF frame\n");
1457 nfc_llcp_recv_agf(local
, skb
);
1462 static void nfc_llcp_rx_work(struct work_struct
*work
)
1464 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
1466 struct sk_buff
*skb
;
1468 skb
= local
->rx_pending
;
1470 pr_debug("No pending SKB\n");
1474 __net_timestamp(skb
);
1476 nfc_llcp_send_to_raw_sock(local
, skb
, NFC_LLCP_DIRECTION_RX
);
1478 nfc_llcp_rx_skb(local
, skb
);
1480 schedule_work(&local
->tx_work
);
1481 kfree_skb(local
->rx_pending
);
1482 local
->rx_pending
= NULL
;
1485 static void __nfc_llcp_recv(struct nfc_llcp_local
*local
, struct sk_buff
*skb
)
1487 local
->rx_pending
= skb
;
1488 del_timer(&local
->link_timer
);
1489 schedule_work(&local
->rx_work
);
1492 void nfc_llcp_recv(void *data
, struct sk_buff
*skb
, int err
)
1494 struct nfc_llcp_local
*local
= (struct nfc_llcp_local
*) data
;
1496 pr_debug("Received an LLCP PDU\n");
1498 pr_err("err %d\n", err
);
1502 __nfc_llcp_recv(local
, skb
);
1505 int nfc_llcp_data_received(struct nfc_dev
*dev
, struct sk_buff
*skb
)
1507 struct nfc_llcp_local
*local
;
1509 local
= nfc_llcp_find_local(dev
);
1513 __nfc_llcp_recv(local
, skb
);
1518 void nfc_llcp_mac_is_down(struct nfc_dev
*dev
)
1520 struct nfc_llcp_local
*local
;
1522 local
= nfc_llcp_find_local(dev
);
1526 local
->remote_miu
= LLCP_DEFAULT_MIU
;
1527 local
->remote_lto
= LLCP_DEFAULT_LTO
;
1529 /* Close and purge all existing sockets */
1530 nfc_llcp_socket_release(local
, true, 0);
1533 void nfc_llcp_mac_is_up(struct nfc_dev
*dev
, u32 target_idx
,
1534 u8 comm_mode
, u8 rf_mode
)
1536 struct nfc_llcp_local
*local
;
1538 pr_debug("rf mode %d\n", rf_mode
);
1540 local
= nfc_llcp_find_local(dev
);
1544 local
->target_idx
= target_idx
;
1545 local
->comm_mode
= comm_mode
;
1546 local
->rf_mode
= rf_mode
;
1548 if (rf_mode
== NFC_RF_INITIATOR
) {
1549 pr_debug("Queueing Tx work\n");
1551 schedule_work(&local
->tx_work
);
1553 mod_timer(&local
->link_timer
,
1554 jiffies
+ msecs_to_jiffies(local
->remote_lto
));
1558 int nfc_llcp_register_device(struct nfc_dev
*ndev
)
1560 struct nfc_llcp_local
*local
;
1562 local
= kzalloc(sizeof(struct nfc_llcp_local
), GFP_KERNEL
);
1567 INIT_LIST_HEAD(&local
->list
);
1568 kref_init(&local
->ref
);
1569 mutex_init(&local
->sdp_lock
);
1570 init_timer(&local
->link_timer
);
1571 local
->link_timer
.data
= (unsigned long) local
;
1572 local
->link_timer
.function
= nfc_llcp_symm_timer
;
1574 skb_queue_head_init(&local
->tx_queue
);
1575 INIT_WORK(&local
->tx_work
, nfc_llcp_tx_work
);
1577 local
->rx_pending
= NULL
;
1578 INIT_WORK(&local
->rx_work
, nfc_llcp_rx_work
);
1580 INIT_WORK(&local
->timeout_work
, nfc_llcp_timeout_work
);
1582 rwlock_init(&local
->sockets
.lock
);
1583 rwlock_init(&local
->connecting_sockets
.lock
);
1584 rwlock_init(&local
->raw_sockets
.lock
);
1586 local
->lto
= 150; /* 1500 ms */
1587 local
->rw
= LLCP_MAX_RW
;
1588 local
->miux
= cpu_to_be16(LLCP_MAX_MIUX
);
1590 nfc_llcp_build_gb(local
);
1592 local
->remote_miu
= LLCP_DEFAULT_MIU
;
1593 local
->remote_lto
= LLCP_DEFAULT_LTO
;
1595 mutex_init(&local
->sdreq_lock
);
1596 INIT_HLIST_HEAD(&local
->pending_sdreqs
);
1597 init_timer(&local
->sdreq_timer
);
1598 local
->sdreq_timer
.data
= (unsigned long) local
;
1599 local
->sdreq_timer
.function
= nfc_llcp_sdreq_timer
;
1600 INIT_WORK(&local
->sdreq_timeout_work
, nfc_llcp_sdreq_timeout_work
);
1602 list_add(&local
->list
, &llcp_devices
);
1607 void nfc_llcp_unregister_device(struct nfc_dev
*dev
)
1609 struct nfc_llcp_local
*local
= nfc_llcp_find_local(dev
);
1611 if (local
== NULL
) {
1612 pr_debug("No such device\n");
1616 local_cleanup(local
);
1618 nfc_llcp_local_put(local
);
1621 int __init
nfc_llcp_init(void)
1623 INIT_LIST_HEAD(&llcp_devices
);
1625 return nfc_llcp_sock_init();
1628 void nfc_llcp_exit(void)
1630 nfc_llcp_sock_exit();