1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2011 Intel Corporation. All rights reserved.
4 * Copyright (C) 2014 Marvell International Ltd.
7 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
9 #include <linux/init.h>
10 #include <linux/kernel.h>
11 #include <linux/list.h>
12 #include <linux/nfc.h>
17 static u8 llcp_magic
[3] = {0x46, 0x66, 0x6d};
19 static LIST_HEAD(llcp_devices
);
20 /* Protects llcp_devices list */
21 static DEFINE_SPINLOCK(llcp_devices_lock
);
23 static void nfc_llcp_rx_skb(struct nfc_llcp_local
*local
, struct sk_buff
*skb
);
25 void nfc_llcp_sock_link(struct llcp_sock_list
*l
, struct sock
*sk
)
28 sk_add_node(sk
, &l
->head
);
29 write_unlock(&l
->lock
);
32 void nfc_llcp_sock_unlink(struct llcp_sock_list
*l
, struct sock
*sk
)
36 write_unlock(&l
->lock
);
39 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock
*sock
)
41 sock
->remote_rw
= LLCP_DEFAULT_RW
;
42 sock
->remote_miu
= LLCP_MAX_MIU
+ 1;
45 static void nfc_llcp_socket_purge(struct nfc_llcp_sock
*sock
)
47 struct nfc_llcp_local
*local
= sock
->local
;
48 struct sk_buff
*s
, *tmp
;
50 skb_queue_purge(&sock
->tx_queue
);
51 skb_queue_purge(&sock
->tx_pending_queue
);
56 /* Search for local pending SKBs that are related to this socket */
57 skb_queue_walk_safe(&local
->tx_queue
, s
, tmp
) {
58 if (s
->sk
!= &sock
->sk
)
61 skb_unlink(s
, &local
->tx_queue
);
66 static void nfc_llcp_socket_release(struct nfc_llcp_local
*local
, bool device
,
70 struct hlist_node
*tmp
;
71 struct nfc_llcp_sock
*llcp_sock
;
73 skb_queue_purge(&local
->tx_queue
);
75 write_lock(&local
->sockets
.lock
);
77 sk_for_each_safe(sk
, tmp
, &local
->sockets
.head
) {
78 llcp_sock
= nfc_llcp_sock(sk
);
82 nfc_llcp_socket_purge(llcp_sock
);
84 if (sk
->sk_state
== LLCP_CONNECTED
)
85 nfc_put_device(llcp_sock
->dev
);
87 if (sk
->sk_state
== LLCP_LISTEN
) {
88 struct nfc_llcp_sock
*lsk
, *n
;
89 struct sock
*accept_sk
;
91 list_for_each_entry_safe(lsk
, n
,
92 &llcp_sock
->accept_queue
,
95 bh_lock_sock(accept_sk
);
97 nfc_llcp_accept_unlink(accept_sk
);
100 accept_sk
->sk_err
= err
;
101 accept_sk
->sk_state
= LLCP_CLOSED
;
102 accept_sk
->sk_state_change(sk
);
104 bh_unlock_sock(accept_sk
);
110 sk
->sk_state
= LLCP_CLOSED
;
111 sk
->sk_state_change(sk
);
115 sk_del_node_init(sk
);
118 write_unlock(&local
->sockets
.lock
);
120 /* If we still have a device, we keep the RAW sockets alive */
124 write_lock(&local
->raw_sockets
.lock
);
126 sk_for_each_safe(sk
, tmp
, &local
->raw_sockets
.head
) {
127 llcp_sock
= nfc_llcp_sock(sk
);
131 nfc_llcp_socket_purge(llcp_sock
);
135 sk
->sk_state
= LLCP_CLOSED
;
136 sk
->sk_state_change(sk
);
140 sk_del_node_init(sk
);
143 write_unlock(&local
->raw_sockets
.lock
);
146 static struct nfc_llcp_local
*nfc_llcp_local_get(struct nfc_llcp_local
*local
)
148 kref_get(&local
->ref
);
153 static void local_cleanup(struct nfc_llcp_local
*local
)
155 nfc_llcp_socket_release(local
, false, ENXIO
);
156 del_timer_sync(&local
->link_timer
);
157 skb_queue_purge(&local
->tx_queue
);
158 cancel_work_sync(&local
->tx_work
);
159 cancel_work_sync(&local
->rx_work
);
160 cancel_work_sync(&local
->timeout_work
);
161 kfree_skb(local
->rx_pending
);
162 local
->rx_pending
= NULL
;
163 del_timer_sync(&local
->sdreq_timer
);
164 cancel_work_sync(&local
->sdreq_timeout_work
);
165 nfc_llcp_free_sdp_tlv_list(&local
->pending_sdreqs
);
168 static void local_release(struct kref
*ref
)
170 struct nfc_llcp_local
*local
;
172 local
= container_of(ref
, struct nfc_llcp_local
, ref
);
174 local_cleanup(local
);
178 int nfc_llcp_local_put(struct nfc_llcp_local
*local
)
183 return kref_put(&local
->ref
, local_release
);
186 static struct nfc_llcp_sock
*nfc_llcp_sock_get(struct nfc_llcp_local
*local
,
190 struct nfc_llcp_sock
*llcp_sock
, *tmp_sock
;
192 pr_debug("ssap dsap %d %d\n", ssap
, dsap
);
194 if (ssap
== 0 && dsap
== 0)
197 read_lock(&local
->sockets
.lock
);
201 sk_for_each(sk
, &local
->sockets
.head
) {
202 tmp_sock
= nfc_llcp_sock(sk
);
204 if (tmp_sock
->ssap
== ssap
&& tmp_sock
->dsap
== dsap
) {
205 llcp_sock
= tmp_sock
;
206 sock_hold(&llcp_sock
->sk
);
211 read_unlock(&local
->sockets
.lock
);
216 static void nfc_llcp_sock_put(struct nfc_llcp_sock
*sock
)
221 static void nfc_llcp_timeout_work(struct work_struct
*work
)
223 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
226 nfc_dep_link_down(local
->dev
);
229 static void nfc_llcp_symm_timer(struct timer_list
*t
)
231 struct nfc_llcp_local
*local
= from_timer(local
, t
, link_timer
);
233 pr_err("SYMM timeout\n");
235 schedule_work(&local
->timeout_work
);
238 static void nfc_llcp_sdreq_timeout_work(struct work_struct
*work
)
241 HLIST_HEAD(nl_sdres_list
);
242 struct hlist_node
*n
;
243 struct nfc_llcp_sdp_tlv
*sdp
;
244 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
247 mutex_lock(&local
->sdreq_lock
);
249 time
= jiffies
- msecs_to_jiffies(3 * local
->remote_lto
);
251 hlist_for_each_entry_safe(sdp
, n
, &local
->pending_sdreqs
, node
) {
252 if (time_after(sdp
->time
, time
))
255 sdp
->sap
= LLCP_SDP_UNBOUND
;
257 hlist_del(&sdp
->node
);
259 hlist_add_head(&sdp
->node
, &nl_sdres_list
);
262 if (!hlist_empty(&local
->pending_sdreqs
))
263 mod_timer(&local
->sdreq_timer
,
264 jiffies
+ msecs_to_jiffies(3 * local
->remote_lto
));
266 mutex_unlock(&local
->sdreq_lock
);
268 if (!hlist_empty(&nl_sdres_list
))
269 nfc_genl_llc_send_sdres(local
->dev
, &nl_sdres_list
);
272 static void nfc_llcp_sdreq_timer(struct timer_list
*t
)
274 struct nfc_llcp_local
*local
= from_timer(local
, t
, sdreq_timer
);
276 schedule_work(&local
->sdreq_timeout_work
);
279 struct nfc_llcp_local
*nfc_llcp_find_local(struct nfc_dev
*dev
)
281 struct nfc_llcp_local
*local
;
282 struct nfc_llcp_local
*res
= NULL
;
284 spin_lock(&llcp_devices_lock
);
285 list_for_each_entry(local
, &llcp_devices
, list
)
286 if (local
->dev
== dev
) {
287 res
= nfc_llcp_local_get(local
);
290 spin_unlock(&llcp_devices_lock
);
295 static struct nfc_llcp_local
*nfc_llcp_remove_local(struct nfc_dev
*dev
)
297 struct nfc_llcp_local
*local
, *tmp
;
299 spin_lock(&llcp_devices_lock
);
300 list_for_each_entry_safe(local
, tmp
, &llcp_devices
, list
)
301 if (local
->dev
== dev
) {
302 list_del(&local
->list
);
303 spin_unlock(&llcp_devices_lock
);
306 spin_unlock(&llcp_devices_lock
);
308 pr_warn("Shutting down device not found\n");
313 static char *wks
[] = {
321 static int nfc_llcp_wks_sap(const char *service_name
, size_t service_name_len
)
325 pr_debug("%s\n", service_name
);
327 if (service_name
== NULL
)
330 num_wks
= ARRAY_SIZE(wks
);
332 for (sap
= 0; sap
< num_wks
; sap
++) {
333 if (wks
[sap
] == NULL
)
336 if (strncmp(wks
[sap
], service_name
, service_name_len
) == 0)
344 struct nfc_llcp_sock
*nfc_llcp_sock_from_sn(struct nfc_llcp_local
*local
,
345 const u8
*sn
, size_t sn_len
,
349 struct nfc_llcp_sock
*llcp_sock
, *tmp_sock
;
351 pr_debug("sn %zd %p\n", sn_len
, sn
);
353 if (sn
== NULL
|| sn_len
== 0)
356 read_lock(&local
->sockets
.lock
);
360 sk_for_each(sk
, &local
->sockets
.head
) {
361 tmp_sock
= nfc_llcp_sock(sk
);
363 pr_debug("llcp sock %p\n", tmp_sock
);
365 if (tmp_sock
->sk
.sk_type
== SOCK_STREAM
&&
366 tmp_sock
->sk
.sk_state
!= LLCP_LISTEN
)
369 if (tmp_sock
->sk
.sk_type
== SOCK_DGRAM
&&
370 tmp_sock
->sk
.sk_state
!= LLCP_BOUND
)
373 if (tmp_sock
->service_name
== NULL
||
374 tmp_sock
->service_name_len
== 0)
377 if (tmp_sock
->service_name_len
!= sn_len
)
380 if (memcmp(sn
, tmp_sock
->service_name
, sn_len
) == 0) {
381 llcp_sock
= tmp_sock
;
383 sock_hold(&llcp_sock
->sk
);
388 read_unlock(&local
->sockets
.lock
);
390 pr_debug("Found llcp sock %p\n", llcp_sock
);
395 u8
nfc_llcp_get_sdp_ssap(struct nfc_llcp_local
*local
,
396 struct nfc_llcp_sock
*sock
)
398 mutex_lock(&local
->sdp_lock
);
400 if (sock
->service_name
!= NULL
&& sock
->service_name_len
> 0) {
401 int ssap
= nfc_llcp_wks_sap(sock
->service_name
,
402 sock
->service_name_len
);
405 pr_debug("WKS %d\n", ssap
);
407 /* This is a WKS, let's check if it's free */
408 if (test_bit(ssap
, &local
->local_wks
)) {
409 mutex_unlock(&local
->sdp_lock
);
414 set_bit(ssap
, &local
->local_wks
);
415 mutex_unlock(&local
->sdp_lock
);
421 * Check if there already is a non WKS socket bound
422 * to this service name.
424 if (nfc_llcp_sock_from_sn(local
, sock
->service_name
,
425 sock
->service_name_len
,
427 mutex_unlock(&local
->sdp_lock
);
432 mutex_unlock(&local
->sdp_lock
);
434 return LLCP_SDP_UNBOUND
;
436 } else if (sock
->ssap
!= 0 && sock
->ssap
< LLCP_WKS_NUM_SAP
) {
437 if (!test_bit(sock
->ssap
, &local
->local_wks
)) {
438 set_bit(sock
->ssap
, &local
->local_wks
);
439 mutex_unlock(&local
->sdp_lock
);
445 mutex_unlock(&local
->sdp_lock
);
450 u8
nfc_llcp_get_local_ssap(struct nfc_llcp_local
*local
)
454 mutex_lock(&local
->sdp_lock
);
456 local_ssap
= find_first_zero_bit(&local
->local_sap
, LLCP_LOCAL_NUM_SAP
);
457 if (local_ssap
== LLCP_LOCAL_NUM_SAP
) {
458 mutex_unlock(&local
->sdp_lock
);
462 set_bit(local_ssap
, &local
->local_sap
);
464 mutex_unlock(&local
->sdp_lock
);
466 return local_ssap
+ LLCP_LOCAL_SAP_OFFSET
;
469 void nfc_llcp_put_ssap(struct nfc_llcp_local
*local
, u8 ssap
)
474 if (ssap
< LLCP_WKS_NUM_SAP
) {
476 sdp
= &local
->local_wks
;
477 } else if (ssap
< LLCP_LOCAL_NUM_SAP
) {
478 atomic_t
*client_cnt
;
480 local_ssap
= ssap
- LLCP_WKS_NUM_SAP
;
481 sdp
= &local
->local_sdp
;
482 client_cnt
= &local
->local_sdp_cnt
[local_ssap
];
484 pr_debug("%d clients\n", atomic_read(client_cnt
));
486 mutex_lock(&local
->sdp_lock
);
488 if (atomic_dec_and_test(client_cnt
)) {
489 struct nfc_llcp_sock
*l_sock
;
491 pr_debug("No more clients for SAP %d\n", ssap
);
493 clear_bit(local_ssap
, sdp
);
495 /* Find the listening sock and set it back to UNBOUND */
496 l_sock
= nfc_llcp_sock_get(local
, ssap
, LLCP_SAP_SDP
);
498 l_sock
->ssap
= LLCP_SDP_UNBOUND
;
499 nfc_llcp_sock_put(l_sock
);
503 mutex_unlock(&local
->sdp_lock
);
506 } else if (ssap
< LLCP_MAX_SAP
) {
507 local_ssap
= ssap
- LLCP_LOCAL_NUM_SAP
;
508 sdp
= &local
->local_sap
;
513 mutex_lock(&local
->sdp_lock
);
515 clear_bit(local_ssap
, sdp
);
517 mutex_unlock(&local
->sdp_lock
);
520 static u8
nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local
*local
)
524 mutex_lock(&local
->sdp_lock
);
526 ssap
= find_first_zero_bit(&local
->local_sdp
, LLCP_SDP_NUM_SAP
);
527 if (ssap
== LLCP_SDP_NUM_SAP
) {
528 mutex_unlock(&local
->sdp_lock
);
533 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP
+ ssap
);
535 set_bit(ssap
, &local
->local_sdp
);
537 mutex_unlock(&local
->sdp_lock
);
539 return LLCP_WKS_NUM_SAP
+ ssap
;
542 static int nfc_llcp_build_gb(struct nfc_llcp_local
*local
)
544 u8
*gb_cur
, version
, version_length
;
545 u8 lto_length
, wks_length
, miux_length
;
546 const u8
*version_tlv
= NULL
, *lto_tlv
= NULL
,
547 *wks_tlv
= NULL
, *miux_tlv
= NULL
;
548 __be16 wks
= cpu_to_be16(local
->local_wks
);
552 version
= LLCP_VERSION_11
;
553 version_tlv
= nfc_llcp_build_tlv(LLCP_TLV_VERSION
, &version
,
559 gb_len
+= version_length
;
561 lto_tlv
= nfc_llcp_build_tlv(LLCP_TLV_LTO
, &local
->lto
, 1, <o_length
);
566 gb_len
+= lto_length
;
568 pr_debug("Local wks 0x%lx\n", local
->local_wks
);
569 wks_tlv
= nfc_llcp_build_tlv(LLCP_TLV_WKS
, (u8
*)&wks
, 2, &wks_length
);
574 gb_len
+= wks_length
;
576 miux_tlv
= nfc_llcp_build_tlv(LLCP_TLV_MIUX
, (u8
*)&local
->miux
, 0,
582 gb_len
+= miux_length
;
584 gb_len
+= ARRAY_SIZE(llcp_magic
);
586 if (gb_len
> NFC_MAX_GT_LEN
) {
593 memcpy(gb_cur
, llcp_magic
, ARRAY_SIZE(llcp_magic
));
594 gb_cur
+= ARRAY_SIZE(llcp_magic
);
596 memcpy(gb_cur
, version_tlv
, version_length
);
597 gb_cur
+= version_length
;
599 memcpy(gb_cur
, lto_tlv
, lto_length
);
600 gb_cur
+= lto_length
;
602 memcpy(gb_cur
, wks_tlv
, wks_length
);
603 gb_cur
+= wks_length
;
605 memcpy(gb_cur
, miux_tlv
, miux_length
);
606 gb_cur
+= miux_length
;
608 local
->gb_len
= gb_len
;
619 u8
*nfc_llcp_general_bytes(struct nfc_dev
*dev
, size_t *general_bytes_len
)
621 struct nfc_llcp_local
*local
;
623 local
= nfc_llcp_find_local(dev
);
625 *general_bytes_len
= 0;
629 nfc_llcp_build_gb(local
);
631 *general_bytes_len
= local
->gb_len
;
633 nfc_llcp_local_put(local
);
638 int nfc_llcp_set_remote_gb(struct nfc_dev
*dev
, const u8
*gb
, u8 gb_len
)
640 struct nfc_llcp_local
*local
;
643 if (gb_len
< 3 || gb_len
> NFC_MAX_GT_LEN
)
646 local
= nfc_llcp_find_local(dev
);
648 pr_err("No LLCP device\n");
652 memset(local
->remote_gb
, 0, NFC_MAX_GT_LEN
);
653 memcpy(local
->remote_gb
, gb
, gb_len
);
654 local
->remote_gb_len
= gb_len
;
656 if (memcmp(local
->remote_gb
, llcp_magic
, 3)) {
657 pr_err("MAC does not support LLCP\n");
662 err
= nfc_llcp_parse_gb_tlv(local
,
663 &local
->remote_gb
[3],
664 local
->remote_gb_len
- 3);
666 nfc_llcp_local_put(local
);
670 static u8
nfc_llcp_dsap(const struct sk_buff
*pdu
)
672 return (pdu
->data
[0] & 0xfc) >> 2;
675 static u8
nfc_llcp_ptype(const struct sk_buff
*pdu
)
677 return ((pdu
->data
[0] & 0x03) << 2) | ((pdu
->data
[1] & 0xc0) >> 6);
680 static u8
nfc_llcp_ssap(const struct sk_buff
*pdu
)
682 return pdu
->data
[1] & 0x3f;
685 static u8
nfc_llcp_ns(const struct sk_buff
*pdu
)
687 return pdu
->data
[2] >> 4;
690 static u8
nfc_llcp_nr(const struct sk_buff
*pdu
)
692 return pdu
->data
[2] & 0xf;
695 static void nfc_llcp_set_nrns(struct nfc_llcp_sock
*sock
, struct sk_buff
*pdu
)
697 pdu
->data
[2] = (sock
->send_n
<< 4) | (sock
->recv_n
);
698 sock
->send_n
= (sock
->send_n
+ 1) % 16;
699 sock
->recv_ack_n
= (sock
->recv_n
- 1) % 16;
702 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local
*local
,
703 struct sk_buff
*skb
, u8 direction
)
705 struct sk_buff
*skb_copy
= NULL
, *nskb
;
709 read_lock(&local
->raw_sockets
.lock
);
711 sk_for_each(sk
, &local
->raw_sockets
.head
) {
712 if (sk
->sk_state
!= LLCP_BOUND
)
715 if (skb_copy
== NULL
) {
716 skb_copy
= __pskb_copy_fclone(skb
, NFC_RAW_HEADER_SIZE
,
719 if (skb_copy
== NULL
)
722 data
= skb_push(skb_copy
, NFC_RAW_HEADER_SIZE
);
724 data
[0] = local
->dev
? local
->dev
->idx
: 0xFF;
725 data
[1] = direction
& 0x01;
726 data
[1] |= (RAW_PAYLOAD_LLCP
<< 1);
729 nskb
= skb_clone(skb_copy
, GFP_ATOMIC
);
733 if (sock_queue_rcv_skb(sk
, nskb
))
737 read_unlock(&local
->raw_sockets
.lock
);
742 static void nfc_llcp_tx_work(struct work_struct
*work
)
744 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
748 struct nfc_llcp_sock
*llcp_sock
;
750 skb
= skb_dequeue(&local
->tx_queue
);
753 llcp_sock
= nfc_llcp_sock(sk
);
755 if (llcp_sock
== NULL
&& nfc_llcp_ptype(skb
) == LLCP_PDU_I
) {
757 nfc_llcp_send_symm(local
->dev
);
758 } else if (llcp_sock
&& !llcp_sock
->remote_ready
) {
759 skb_queue_head(&local
->tx_queue
, skb
);
760 nfc_llcp_send_symm(local
->dev
);
762 struct sk_buff
*copy_skb
= NULL
;
763 u8 ptype
= nfc_llcp_ptype(skb
);
766 pr_debug("Sending pending skb\n");
767 print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET
,
768 16, 1, skb
->data
, skb
->len
, true);
770 if (ptype
== LLCP_PDU_I
)
771 copy_skb
= skb_copy(skb
, GFP_ATOMIC
);
773 __net_timestamp(skb
);
775 nfc_llcp_send_to_raw_sock(local
, skb
,
778 ret
= nfc_data_exchange(local
->dev
, local
->target_idx
,
779 skb
, nfc_llcp_recv
, local
);
786 if (ptype
== LLCP_PDU_I
&& copy_skb
)
787 skb_queue_tail(&llcp_sock
->tx_pending_queue
,
791 nfc_llcp_send_symm(local
->dev
);
795 mod_timer(&local
->link_timer
,
796 jiffies
+ msecs_to_jiffies(2 * local
->remote_lto
));
799 static struct nfc_llcp_sock
*nfc_llcp_connecting_sock_get(struct nfc_llcp_local
*local
,
803 struct nfc_llcp_sock
*llcp_sock
;
805 read_lock(&local
->connecting_sockets
.lock
);
807 sk_for_each(sk
, &local
->connecting_sockets
.head
) {
808 llcp_sock
= nfc_llcp_sock(sk
);
810 if (llcp_sock
->ssap
== ssap
) {
811 sock_hold(&llcp_sock
->sk
);
819 read_unlock(&local
->connecting_sockets
.lock
);
824 static struct nfc_llcp_sock
*nfc_llcp_sock_get_sn(struct nfc_llcp_local
*local
,
825 const u8
*sn
, size_t sn_len
)
827 return nfc_llcp_sock_from_sn(local
, sn
, sn_len
, true);
830 static const u8
*nfc_llcp_connect_sn(const struct sk_buff
*skb
, size_t *sn_len
)
833 const u8
*tlv
= &skb
->data
[2];
834 size_t tlv_array_len
= skb
->len
- LLCP_HEADER_SIZE
, offset
= 0;
836 while (offset
< tlv_array_len
) {
840 pr_debug("type 0x%x length %d\n", type
, length
);
842 if (type
== LLCP_TLV_SN
) {
847 offset
+= length
+ 2;
854 static void nfc_llcp_recv_ui(struct nfc_llcp_local
*local
,
857 struct nfc_llcp_sock
*llcp_sock
;
858 struct nfc_llcp_ui_cb
*ui_cb
;
861 dsap
= nfc_llcp_dsap(skb
);
862 ssap
= nfc_llcp_ssap(skb
);
864 ui_cb
= nfc_llcp_ui_skb_cb(skb
);
868 pr_debug("%d %d\n", dsap
, ssap
);
870 /* We're looking for a bound socket, not a client one */
871 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, LLCP_SAP_SDP
);
872 if (llcp_sock
== NULL
|| llcp_sock
->sk
.sk_type
!= SOCK_DGRAM
)
875 /* There is no sequence with UI frames */
876 skb_pull(skb
, LLCP_HEADER_SIZE
);
877 if (!sock_queue_rcv_skb(&llcp_sock
->sk
, skb
)) {
879 * UI frames will be freed from the socket layer, so we
880 * need to keep them alive until someone receives them.
884 pr_err("Receive queue is full\n");
887 nfc_llcp_sock_put(llcp_sock
);
890 static void nfc_llcp_recv_connect(struct nfc_llcp_local
*local
,
891 const struct sk_buff
*skb
)
893 struct sock
*new_sk
, *parent
;
894 struct nfc_llcp_sock
*sock
, *new_sock
;
895 u8 dsap
, ssap
, reason
;
897 dsap
= nfc_llcp_dsap(skb
);
898 ssap
= nfc_llcp_ssap(skb
);
900 pr_debug("%d %d\n", dsap
, ssap
);
902 if (dsap
!= LLCP_SAP_SDP
) {
903 sock
= nfc_llcp_sock_get(local
, dsap
, LLCP_SAP_SDP
);
904 if (sock
== NULL
|| sock
->sk
.sk_state
!= LLCP_LISTEN
) {
905 reason
= LLCP_DM_NOBOUND
;
912 sn
= nfc_llcp_connect_sn(skb
, &sn_len
);
914 reason
= LLCP_DM_NOBOUND
;
918 pr_debug("Service name length %zu\n", sn_len
);
920 sock
= nfc_llcp_sock_get_sn(local
, sn
, sn_len
);
922 reason
= LLCP_DM_NOBOUND
;
927 lock_sock(&sock
->sk
);
931 if (sk_acceptq_is_full(parent
)) {
932 reason
= LLCP_DM_REJ
;
933 release_sock(&sock
->sk
);
938 if (sock
->ssap
== LLCP_SDP_UNBOUND
) {
939 u8 ssap
= nfc_llcp_reserve_sdp_ssap(local
);
941 pr_debug("First client, reserving %d\n", ssap
);
943 if (ssap
== LLCP_SAP_MAX
) {
944 reason
= LLCP_DM_REJ
;
945 release_sock(&sock
->sk
);
953 new_sk
= nfc_llcp_sock_alloc(NULL
, parent
->sk_type
, GFP_ATOMIC
, 0);
954 if (new_sk
== NULL
) {
955 reason
= LLCP_DM_REJ
;
956 release_sock(&sock
->sk
);
961 new_sock
= nfc_llcp_sock(new_sk
);
962 new_sock
->dev
= local
->dev
;
963 new_sock
->local
= nfc_llcp_local_get(local
);
964 new_sock
->rw
= sock
->rw
;
965 new_sock
->miux
= sock
->miux
;
966 new_sock
->nfc_protocol
= sock
->nfc_protocol
;
967 new_sock
->dsap
= ssap
;
968 new_sock
->target_idx
= local
->target_idx
;
969 new_sock
->parent
= parent
;
970 new_sock
->ssap
= sock
->ssap
;
971 if (sock
->ssap
< LLCP_LOCAL_NUM_SAP
&& sock
->ssap
>= LLCP_WKS_NUM_SAP
) {
972 atomic_t
*client_count
;
974 pr_debug("reserved_ssap %d for %p\n", sock
->ssap
, new_sock
);
977 &local
->local_sdp_cnt
[sock
->ssap
- LLCP_WKS_NUM_SAP
];
979 atomic_inc(client_count
);
980 new_sock
->reserved_ssap
= sock
->ssap
;
983 nfc_llcp_parse_connection_tlv(new_sock
, &skb
->data
[LLCP_HEADER_SIZE
],
984 skb
->len
- LLCP_HEADER_SIZE
);
986 pr_debug("new sock %p sk %p\n", new_sock
, &new_sock
->sk
);
988 nfc_llcp_sock_link(&local
->sockets
, new_sk
);
990 nfc_llcp_accept_enqueue(&sock
->sk
, new_sk
);
992 nfc_get_device(local
->dev
->idx
);
994 new_sk
->sk_state
= LLCP_CONNECTED
;
996 /* Wake the listening processes */
997 parent
->sk_data_ready(parent
);
1000 nfc_llcp_send_cc(new_sock
);
1002 release_sock(&sock
->sk
);
1003 sock_put(&sock
->sk
);
1009 nfc_llcp_send_dm(local
, dsap
, ssap
, reason
);
1012 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock
*sock
)
1015 struct nfc_llcp_local
*local
= sock
->local
;
1017 pr_debug("Remote ready %d tx queue len %d remote rw %d",
1018 sock
->remote_ready
, skb_queue_len(&sock
->tx_pending_queue
),
1021 /* Try to queue some I frames for transmission */
1022 while (sock
->remote_ready
&&
1023 skb_queue_len(&sock
->tx_pending_queue
) < sock
->remote_rw
) {
1024 struct sk_buff
*pdu
;
1026 pdu
= skb_dequeue(&sock
->tx_queue
);
1030 /* Update N(S)/N(R) */
1031 nfc_llcp_set_nrns(sock
, pdu
);
1033 skb_queue_tail(&local
->tx_queue
, pdu
);
1040 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local
*local
,
1041 struct sk_buff
*skb
)
1043 struct nfc_llcp_sock
*llcp_sock
;
1045 u8 dsap
, ssap
, ptype
, ns
, nr
;
1047 ptype
= nfc_llcp_ptype(skb
);
1048 dsap
= nfc_llcp_dsap(skb
);
1049 ssap
= nfc_llcp_ssap(skb
);
1050 ns
= nfc_llcp_ns(skb
);
1051 nr
= nfc_llcp_nr(skb
);
1053 pr_debug("%d %d R %d S %d\n", dsap
, ssap
, nr
, ns
);
1055 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, ssap
);
1056 if (llcp_sock
== NULL
) {
1057 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_NOCONN
);
1061 sk
= &llcp_sock
->sk
;
1063 if (sk
->sk_state
== LLCP_CLOSED
) {
1065 nfc_llcp_sock_put(llcp_sock
);
1068 /* Pass the payload upstream */
1069 if (ptype
== LLCP_PDU_I
) {
1070 pr_debug("I frame, queueing on %p\n", &llcp_sock
->sk
);
1072 if (ns
== llcp_sock
->recv_n
)
1073 llcp_sock
->recv_n
= (llcp_sock
->recv_n
+ 1) % 16;
1075 pr_err("Received out of sequence I PDU\n");
1077 skb_pull(skb
, LLCP_HEADER_SIZE
+ LLCP_SEQUENCE_SIZE
);
1078 if (!sock_queue_rcv_skb(&llcp_sock
->sk
, skb
)) {
1080 * I frames will be freed from the socket layer, so we
1081 * need to keep them alive until someone receives them.
1085 pr_err("Receive queue is full\n");
1089 /* Remove skbs from the pending queue */
1090 if (llcp_sock
->send_ack_n
!= nr
) {
1091 struct sk_buff
*s
, *tmp
;
1094 llcp_sock
->send_ack_n
= nr
;
1096 /* Remove and free all skbs until ns == nr */
1097 skb_queue_walk_safe(&llcp_sock
->tx_pending_queue
, s
, tmp
) {
1100 skb_unlink(s
, &llcp_sock
->tx_pending_queue
);
1107 /* Re-queue the remaining skbs for transmission */
1108 skb_queue_reverse_walk_safe(&llcp_sock
->tx_pending_queue
,
1110 skb_unlink(s
, &llcp_sock
->tx_pending_queue
);
1111 skb_queue_head(&local
->tx_queue
, s
);
1115 if (ptype
== LLCP_PDU_RR
)
1116 llcp_sock
->remote_ready
= true;
1117 else if (ptype
== LLCP_PDU_RNR
)
1118 llcp_sock
->remote_ready
= false;
1120 if (nfc_llcp_queue_i_frames(llcp_sock
) == 0 && ptype
== LLCP_PDU_I
)
1121 nfc_llcp_send_rr(llcp_sock
);
1124 nfc_llcp_sock_put(llcp_sock
);
1127 static void nfc_llcp_recv_disc(struct nfc_llcp_local
*local
,
1128 const struct sk_buff
*skb
)
1130 struct nfc_llcp_sock
*llcp_sock
;
1134 dsap
= nfc_llcp_dsap(skb
);
1135 ssap
= nfc_llcp_ssap(skb
);
1137 if ((dsap
== 0) && (ssap
== 0)) {
1138 pr_debug("Connection termination");
1139 nfc_dep_link_down(local
->dev
);
1143 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, ssap
);
1144 if (llcp_sock
== NULL
) {
1145 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_NOCONN
);
1149 sk
= &llcp_sock
->sk
;
1152 nfc_llcp_socket_purge(llcp_sock
);
1154 if (sk
->sk_state
== LLCP_CLOSED
) {
1156 nfc_llcp_sock_put(llcp_sock
);
1159 if (sk
->sk_state
== LLCP_CONNECTED
) {
1160 nfc_put_device(local
->dev
);
1161 sk
->sk_state
= LLCP_CLOSED
;
1162 sk
->sk_state_change(sk
);
1165 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_DISC
);
1168 nfc_llcp_sock_put(llcp_sock
);
1171 static void nfc_llcp_recv_cc(struct nfc_llcp_local
*local
,
1172 const struct sk_buff
*skb
)
1174 struct nfc_llcp_sock
*llcp_sock
;
1178 dsap
= nfc_llcp_dsap(skb
);
1179 ssap
= nfc_llcp_ssap(skb
);
1181 llcp_sock
= nfc_llcp_connecting_sock_get(local
, dsap
);
1182 if (llcp_sock
== NULL
) {
1183 pr_err("Invalid CC\n");
1184 nfc_llcp_send_dm(local
, dsap
, ssap
, LLCP_DM_NOCONN
);
1189 sk
= &llcp_sock
->sk
;
1191 /* Unlink from connecting and link to the client array */
1192 nfc_llcp_sock_unlink(&local
->connecting_sockets
, sk
);
1193 nfc_llcp_sock_link(&local
->sockets
, sk
);
1194 llcp_sock
->dsap
= ssap
;
1196 nfc_llcp_parse_connection_tlv(llcp_sock
, &skb
->data
[LLCP_HEADER_SIZE
],
1197 skb
->len
- LLCP_HEADER_SIZE
);
1199 sk
->sk_state
= LLCP_CONNECTED
;
1200 sk
->sk_state_change(sk
);
1202 nfc_llcp_sock_put(llcp_sock
);
1205 static void nfc_llcp_recv_dm(struct nfc_llcp_local
*local
,
1206 const struct sk_buff
*skb
)
1208 struct nfc_llcp_sock
*llcp_sock
;
1210 u8 dsap
, ssap
, reason
;
1212 dsap
= nfc_llcp_dsap(skb
);
1213 ssap
= nfc_llcp_ssap(skb
);
1214 reason
= skb
->data
[2];
1216 pr_debug("%d %d reason %d\n", ssap
, dsap
, reason
);
1219 case LLCP_DM_NOBOUND
:
1221 llcp_sock
= nfc_llcp_connecting_sock_get(local
, dsap
);
1225 llcp_sock
= nfc_llcp_sock_get(local
, dsap
, ssap
);
1229 if (llcp_sock
== NULL
) {
1230 pr_debug("Already closed\n");
1234 sk
= &llcp_sock
->sk
;
1237 sk
->sk_state
= LLCP_CLOSED
;
1238 sk
->sk_state_change(sk
);
1240 nfc_llcp_sock_put(llcp_sock
);
1243 static void nfc_llcp_recv_snl(struct nfc_llcp_local
*local
,
1244 const struct sk_buff
*skb
)
1246 struct nfc_llcp_sock
*llcp_sock
;
1247 u8 dsap
, ssap
, type
, length
, tid
, sap
;
1249 u16 tlv_len
, offset
;
1250 const char *service_name
;
1251 size_t service_name_len
;
1252 struct nfc_llcp_sdp_tlv
*sdp
;
1253 HLIST_HEAD(llc_sdres_list
);
1254 size_t sdres_tlvs_len
;
1255 HLIST_HEAD(nl_sdres_list
);
1257 dsap
= nfc_llcp_dsap(skb
);
1258 ssap
= nfc_llcp_ssap(skb
);
1260 pr_debug("%d %d\n", dsap
, ssap
);
1262 if (dsap
!= LLCP_SAP_SDP
|| ssap
!= LLCP_SAP_SDP
) {
1263 pr_err("Wrong SNL SAP\n");
1267 tlv
= &skb
->data
[LLCP_HEADER_SIZE
];
1268 tlv_len
= skb
->len
- LLCP_HEADER_SIZE
;
1272 while (offset
< tlv_len
) {
1277 case LLCP_TLV_SDREQ
:
1279 service_name
= (char *) &tlv
[3];
1280 service_name_len
= length
- 1;
1282 pr_debug("Looking for %.16s\n", service_name
);
1284 if (service_name_len
== strlen("urn:nfc:sn:sdp") &&
1285 !strncmp(service_name
, "urn:nfc:sn:sdp",
1286 service_name_len
)) {
1291 llcp_sock
= nfc_llcp_sock_from_sn(local
, service_name
,
1300 * We found a socket but its ssap has not been reserved
1301 * yet. We need to assign it for good and send a reply.
1302 * The ssap will be freed when the socket is closed.
1304 if (llcp_sock
->ssap
== LLCP_SDP_UNBOUND
) {
1305 atomic_t
*client_count
;
1307 sap
= nfc_llcp_reserve_sdp_ssap(local
);
1309 pr_debug("Reserving %d\n", sap
);
1311 if (sap
== LLCP_SAP_MAX
) {
1313 nfc_llcp_sock_put(llcp_sock
);
1318 &local
->local_sdp_cnt
[sap
-
1321 atomic_inc(client_count
);
1323 llcp_sock
->ssap
= sap
;
1324 llcp_sock
->reserved_ssap
= sap
;
1326 sap
= llcp_sock
->ssap
;
1329 pr_debug("%p %d\n", llcp_sock
, sap
);
1331 nfc_llcp_sock_put(llcp_sock
);
1333 sdp
= nfc_llcp_build_sdres_tlv(tid
, sap
);
1337 sdres_tlvs_len
+= sdp
->tlv_len
;
1338 hlist_add_head(&sdp
->node
, &llc_sdres_list
);
1341 case LLCP_TLV_SDRES
:
1342 mutex_lock(&local
->sdreq_lock
);
1344 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv
[2]);
1346 hlist_for_each_entry(sdp
, &local
->pending_sdreqs
, node
) {
1347 if (sdp
->tid
!= tlv
[2])
1352 pr_debug("Found: uri=%s, sap=%d\n",
1353 sdp
->uri
, sdp
->sap
);
1355 hlist_del(&sdp
->node
);
1357 hlist_add_head(&sdp
->node
, &nl_sdres_list
);
1362 mutex_unlock(&local
->sdreq_lock
);
1366 pr_err("Invalid SNL tlv value 0x%x\n", type
);
1370 offset
+= length
+ 2;
1375 if (!hlist_empty(&nl_sdres_list
))
1376 nfc_genl_llc_send_sdres(local
->dev
, &nl_sdres_list
);
1378 if (!hlist_empty(&llc_sdres_list
))
1379 nfc_llcp_send_snl_sdres(local
, &llc_sdres_list
, sdres_tlvs_len
);
1382 static void nfc_llcp_recv_agf(struct nfc_llcp_local
*local
, struct sk_buff
*skb
)
1386 struct sk_buff
*new_skb
;
1388 if (skb
->len
<= LLCP_HEADER_SIZE
) {
1389 pr_err("Malformed AGF PDU\n");
1393 skb_pull(skb
, LLCP_HEADER_SIZE
);
1395 while (skb
->len
> LLCP_AGF_PDU_HEADER_SIZE
) {
1396 pdu_len
= skb
->data
[0] << 8 | skb
->data
[1];
1398 skb_pull(skb
, LLCP_AGF_PDU_HEADER_SIZE
);
1400 if (pdu_len
< LLCP_HEADER_SIZE
|| pdu_len
> skb
->len
) {
1401 pr_err("Malformed AGF PDU\n");
1405 ptype
= nfc_llcp_ptype(skb
);
1407 if (ptype
== LLCP_PDU_SYMM
|| ptype
== LLCP_PDU_AGF
)
1410 new_skb
= nfc_alloc_recv_skb(pdu_len
, GFP_KERNEL
);
1411 if (new_skb
== NULL
) {
1412 pr_err("Could not allocate PDU\n");
1416 skb_put_data(new_skb
, skb
->data
, pdu_len
);
1418 nfc_llcp_rx_skb(local
, new_skb
);
1422 skb_pull(skb
, pdu_len
);
1426 static void nfc_llcp_rx_skb(struct nfc_llcp_local
*local
, struct sk_buff
*skb
)
1428 u8 dsap
, ssap
, ptype
;
1430 ptype
= nfc_llcp_ptype(skb
);
1431 dsap
= nfc_llcp_dsap(skb
);
1432 ssap
= nfc_llcp_ssap(skb
);
1434 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype
, dsap
, ssap
);
1436 if (ptype
!= LLCP_PDU_SYMM
)
1437 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET
, 16, 1,
1438 skb
->data
, skb
->len
, true);
1447 nfc_llcp_recv_ui(local
, skb
);
1450 case LLCP_PDU_CONNECT
:
1451 pr_debug("CONNECT\n");
1452 nfc_llcp_recv_connect(local
, skb
);
1457 nfc_llcp_recv_disc(local
, skb
);
1462 nfc_llcp_recv_cc(local
, skb
);
1467 nfc_llcp_recv_dm(local
, skb
);
1472 nfc_llcp_recv_snl(local
, skb
);
1478 pr_debug("I frame\n");
1479 nfc_llcp_recv_hdlc(local
, skb
);
1483 pr_debug("AGF frame\n");
1484 nfc_llcp_recv_agf(local
, skb
);
1489 static void nfc_llcp_rx_work(struct work_struct
*work
)
1491 struct nfc_llcp_local
*local
= container_of(work
, struct nfc_llcp_local
,
1493 struct sk_buff
*skb
;
1495 skb
= local
->rx_pending
;
1497 pr_debug("No pending SKB\n");
1501 __net_timestamp(skb
);
1503 nfc_llcp_send_to_raw_sock(local
, skb
, NFC_DIRECTION_RX
);
1505 nfc_llcp_rx_skb(local
, skb
);
1507 schedule_work(&local
->tx_work
);
1508 kfree_skb(local
->rx_pending
);
1509 local
->rx_pending
= NULL
;
1512 static void __nfc_llcp_recv(struct nfc_llcp_local
*local
, struct sk_buff
*skb
)
1514 local
->rx_pending
= skb
;
1515 del_timer(&local
->link_timer
);
1516 schedule_work(&local
->rx_work
);
1519 void nfc_llcp_recv(void *data
, struct sk_buff
*skb
, int err
)
1521 struct nfc_llcp_local
*local
= (struct nfc_llcp_local
*) data
;
1524 pr_err("LLCP PDU receive err %d\n", err
);
1528 __nfc_llcp_recv(local
, skb
);
1531 int nfc_llcp_data_received(struct nfc_dev
*dev
, struct sk_buff
*skb
)
1533 struct nfc_llcp_local
*local
;
1535 local
= nfc_llcp_find_local(dev
);
1536 if (local
== NULL
) {
1541 __nfc_llcp_recv(local
, skb
);
1543 nfc_llcp_local_put(local
);
1548 void nfc_llcp_mac_is_down(struct nfc_dev
*dev
)
1550 struct nfc_llcp_local
*local
;
1552 local
= nfc_llcp_find_local(dev
);
1556 local
->remote_miu
= LLCP_DEFAULT_MIU
;
1557 local
->remote_lto
= LLCP_DEFAULT_LTO
;
1559 /* Close and purge all existing sockets */
1560 nfc_llcp_socket_release(local
, true, 0);
1562 nfc_llcp_local_put(local
);
1565 void nfc_llcp_mac_is_up(struct nfc_dev
*dev
, u32 target_idx
,
1566 u8 comm_mode
, u8 rf_mode
)
1568 struct nfc_llcp_local
*local
;
1570 pr_debug("rf mode %d\n", rf_mode
);
1572 local
= nfc_llcp_find_local(dev
);
1576 local
->target_idx
= target_idx
;
1577 local
->comm_mode
= comm_mode
;
1578 local
->rf_mode
= rf_mode
;
1580 if (rf_mode
== NFC_RF_INITIATOR
) {
1581 pr_debug("Queueing Tx work\n");
1583 schedule_work(&local
->tx_work
);
1585 mod_timer(&local
->link_timer
,
1586 jiffies
+ msecs_to_jiffies(local
->remote_lto
));
1589 nfc_llcp_local_put(local
);
1592 int nfc_llcp_register_device(struct nfc_dev
*ndev
)
1594 struct nfc_llcp_local
*local
;
1596 local
= kzalloc(sizeof(struct nfc_llcp_local
), GFP_KERNEL
);
1601 INIT_LIST_HEAD(&local
->list
);
1602 kref_init(&local
->ref
);
1603 mutex_init(&local
->sdp_lock
);
1604 timer_setup(&local
->link_timer
, nfc_llcp_symm_timer
, 0);
1606 skb_queue_head_init(&local
->tx_queue
);
1607 INIT_WORK(&local
->tx_work
, nfc_llcp_tx_work
);
1609 local
->rx_pending
= NULL
;
1610 INIT_WORK(&local
->rx_work
, nfc_llcp_rx_work
);
1612 INIT_WORK(&local
->timeout_work
, nfc_llcp_timeout_work
);
1614 rwlock_init(&local
->sockets
.lock
);
1615 rwlock_init(&local
->connecting_sockets
.lock
);
1616 rwlock_init(&local
->raw_sockets
.lock
);
1618 local
->lto
= 150; /* 1500 ms */
1619 local
->rw
= LLCP_MAX_RW
;
1620 local
->miux
= cpu_to_be16(LLCP_MAX_MIUX
);
1621 local
->local_wks
= 0x1; /* LLC Link Management */
1623 nfc_llcp_build_gb(local
);
1625 local
->remote_miu
= LLCP_DEFAULT_MIU
;
1626 local
->remote_lto
= LLCP_DEFAULT_LTO
;
1628 mutex_init(&local
->sdreq_lock
);
1629 INIT_HLIST_HEAD(&local
->pending_sdreqs
);
1630 timer_setup(&local
->sdreq_timer
, nfc_llcp_sdreq_timer
, 0);
1631 INIT_WORK(&local
->sdreq_timeout_work
, nfc_llcp_sdreq_timeout_work
);
1633 spin_lock(&llcp_devices_lock
);
1634 list_add(&local
->list
, &llcp_devices
);
1635 spin_unlock(&llcp_devices_lock
);
1640 void nfc_llcp_unregister_device(struct nfc_dev
*dev
)
1642 struct nfc_llcp_local
*local
= nfc_llcp_remove_local(dev
);
1644 if (local
== NULL
) {
1645 pr_debug("No such device\n");
1649 local_cleanup(local
);
1651 nfc_llcp_local_put(local
);
1654 int __init
nfc_llcp_init(void)
1656 return nfc_llcp_sock_init();
1659 void nfc_llcp_exit(void)
1661 nfc_llcp_sock_exit();