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;
210 read_unlock(&local->sockets.lock);
212 if (llcp_sock == NULL)
215 sock_hold(&llcp_sock->sk);
220 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
225 static void nfc_llcp_timeout_work(struct work_struct *work)
227 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
230 nfc_dep_link_down(local->dev);
233 static void nfc_llcp_symm_timer(struct timer_list *t)
235 struct nfc_llcp_local *local = from_timer(local, t, link_timer);
237 pr_err("SYMM timeout\n");
239 schedule_work(&local->timeout_work);
242 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
245 HLIST_HEAD(nl_sdres_list);
246 struct hlist_node *n;
247 struct nfc_llcp_sdp_tlv *sdp;
248 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
251 mutex_lock(&local->sdreq_lock);
253 time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
255 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
256 if (time_after(sdp->time, time))
259 sdp->sap = LLCP_SDP_UNBOUND;
261 hlist_del(&sdp->node);
263 hlist_add_head(&sdp->node, &nl_sdres_list);
266 if (!hlist_empty(&local->pending_sdreqs))
267 mod_timer(&local->sdreq_timer,
268 jiffies + msecs_to_jiffies(3 * local->remote_lto));
270 mutex_unlock(&local->sdreq_lock);
272 if (!hlist_empty(&nl_sdres_list))
273 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
276 static void nfc_llcp_sdreq_timer(struct timer_list *t)
278 struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer);
280 schedule_work(&local->sdreq_timeout_work);
283 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
285 struct nfc_llcp_local *local;
286 struct nfc_llcp_local *res = NULL;
288 spin_lock(&llcp_devices_lock);
289 list_for_each_entry(local, &llcp_devices, list)
290 if (local->dev == dev) {
291 res = nfc_llcp_local_get(local);
294 spin_unlock(&llcp_devices_lock);
299 static struct nfc_llcp_local *nfc_llcp_remove_local(struct nfc_dev *dev)
301 struct nfc_llcp_local *local, *tmp;
303 spin_lock(&llcp_devices_lock);
304 list_for_each_entry_safe(local, tmp, &llcp_devices, list)
305 if (local->dev == dev) {
306 list_del(&local->list);
307 spin_unlock(&llcp_devices_lock);
310 spin_unlock(&llcp_devices_lock);
312 pr_warn("Shutting down device not found\n");
317 static char *wks[] = {
325 static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len)
329 pr_debug("%s\n", service_name);
331 if (service_name == NULL)
334 num_wks = ARRAY_SIZE(wks);
336 for (sap = 0; sap < num_wks; sap++) {
337 if (wks[sap] == NULL)
340 if (strncmp(wks[sap], service_name, service_name_len) == 0)
348 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
349 const u8 *sn, size_t sn_len)
352 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
354 pr_debug("sn %zd %p\n", sn_len, sn);
356 if (sn == NULL || sn_len == 0)
359 read_lock(&local->sockets.lock);
363 sk_for_each(sk, &local->sockets.head) {
364 tmp_sock = nfc_llcp_sock(sk);
366 pr_debug("llcp sock %p\n", tmp_sock);
368 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
369 tmp_sock->sk.sk_state != LLCP_LISTEN)
372 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
373 tmp_sock->sk.sk_state != LLCP_BOUND)
376 if (tmp_sock->service_name == NULL ||
377 tmp_sock->service_name_len == 0)
380 if (tmp_sock->service_name_len != sn_len)
383 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
384 llcp_sock = tmp_sock;
389 read_unlock(&local->sockets.lock);
391 pr_debug("Found llcp sock %p\n", llcp_sock);
396 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
397 struct nfc_llcp_sock *sock)
399 mutex_lock(&local->sdp_lock);
401 if (sock->service_name != NULL && sock->service_name_len > 0) {
402 int ssap = nfc_llcp_wks_sap(sock->service_name,
403 sock->service_name_len);
406 pr_debug("WKS %d\n", ssap);
408 /* This is a WKS, let's check if it's free */
409 if (test_bit(ssap, &local->local_wks)) {
410 mutex_unlock(&local->sdp_lock);
415 set_bit(ssap, &local->local_wks);
416 mutex_unlock(&local->sdp_lock);
422 * Check if there already is a non WKS socket bound
423 * to this service name.
425 if (nfc_llcp_sock_from_sn(local, sock->service_name,
426 sock->service_name_len) != NULL) {
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 struct nfc_llcp_sock *llcp_sock;
829 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
831 if (llcp_sock == NULL)
834 sock_hold(&llcp_sock->sk);
839 static const u8 *nfc_llcp_connect_sn(const struct sk_buff *skb, size_t *sn_len)
842 const u8 *tlv = &skb->data[2];
843 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
845 while (offset < tlv_array_len) {
849 pr_debug("type 0x%x length %d\n", type, length);
851 if (type == LLCP_TLV_SN) {
856 offset += length + 2;
863 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
866 struct nfc_llcp_sock *llcp_sock;
867 struct nfc_llcp_ui_cb *ui_cb;
870 dsap = nfc_llcp_dsap(skb);
871 ssap = nfc_llcp_ssap(skb);
873 ui_cb = nfc_llcp_ui_skb_cb(skb);
877 pr_debug("%d %d\n", dsap, ssap);
879 /* We're looking for a bound socket, not a client one */
880 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
881 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
884 /* There is no sequence with UI frames */
885 skb_pull(skb, LLCP_HEADER_SIZE);
886 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
888 * UI frames will be freed from the socket layer, so we
889 * need to keep them alive until someone receives them.
893 pr_err("Receive queue is full\n");
896 nfc_llcp_sock_put(llcp_sock);
899 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
900 const struct sk_buff *skb)
902 struct sock *new_sk, *parent;
903 struct nfc_llcp_sock *sock, *new_sock;
904 u8 dsap, ssap, reason;
906 dsap = nfc_llcp_dsap(skb);
907 ssap = nfc_llcp_ssap(skb);
909 pr_debug("%d %d\n", dsap, ssap);
911 if (dsap != LLCP_SAP_SDP) {
912 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
913 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
914 reason = LLCP_DM_NOBOUND;
921 sn = nfc_llcp_connect_sn(skb, &sn_len);
923 reason = LLCP_DM_NOBOUND;
927 pr_debug("Service name length %zu\n", sn_len);
929 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
931 reason = LLCP_DM_NOBOUND;
936 lock_sock(&sock->sk);
940 if (sk_acceptq_is_full(parent)) {
941 reason = LLCP_DM_REJ;
942 release_sock(&sock->sk);
947 if (sock->ssap == LLCP_SDP_UNBOUND) {
948 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
950 pr_debug("First client, reserving %d\n", ssap);
952 if (ssap == LLCP_SAP_MAX) {
953 reason = LLCP_DM_REJ;
954 release_sock(&sock->sk);
962 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
963 if (new_sk == NULL) {
964 reason = LLCP_DM_REJ;
965 release_sock(&sock->sk);
970 new_sock = nfc_llcp_sock(new_sk);
971 new_sock->dev = local->dev;
972 new_sock->local = nfc_llcp_local_get(local);
973 new_sock->rw = sock->rw;
974 new_sock->miux = sock->miux;
975 new_sock->nfc_protocol = sock->nfc_protocol;
976 new_sock->dsap = ssap;
977 new_sock->target_idx = local->target_idx;
978 new_sock->parent = parent;
979 new_sock->ssap = sock->ssap;
980 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
981 atomic_t *client_count;
983 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
986 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
988 atomic_inc(client_count);
989 new_sock->reserved_ssap = sock->ssap;
992 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
993 skb->len - LLCP_HEADER_SIZE);
995 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
997 nfc_llcp_sock_link(&local->sockets, new_sk);
999 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
1001 nfc_get_device(local->dev->idx);
1003 new_sk->sk_state = LLCP_CONNECTED;
1005 /* Wake the listening processes */
1006 parent->sk_data_ready(parent);
1009 nfc_llcp_send_cc(new_sock);
1011 release_sock(&sock->sk);
1012 sock_put(&sock->sk);
1018 nfc_llcp_send_dm(local, dsap, ssap, reason);
1021 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
1024 struct nfc_llcp_local *local = sock->local;
1026 pr_debug("Remote ready %d tx queue len %d remote rw %d",
1027 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1030 /* Try to queue some I frames for transmission */
1031 while (sock->remote_ready &&
1032 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1033 struct sk_buff *pdu;
1035 pdu = skb_dequeue(&sock->tx_queue);
1039 /* Update N(S)/N(R) */
1040 nfc_llcp_set_nrns(sock, pdu);
1042 skb_queue_tail(&local->tx_queue, pdu);
1049 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1050 struct sk_buff *skb)
1052 struct nfc_llcp_sock *llcp_sock;
1054 u8 dsap, ssap, ptype, ns, nr;
1056 ptype = nfc_llcp_ptype(skb);
1057 dsap = nfc_llcp_dsap(skb);
1058 ssap = nfc_llcp_ssap(skb);
1059 ns = nfc_llcp_ns(skb);
1060 nr = nfc_llcp_nr(skb);
1062 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1064 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1065 if (llcp_sock == NULL) {
1066 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1070 sk = &llcp_sock->sk;
1072 if (sk->sk_state == LLCP_CLOSED) {
1074 nfc_llcp_sock_put(llcp_sock);
1077 /* Pass the payload upstream */
1078 if (ptype == LLCP_PDU_I) {
1079 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1081 if (ns == llcp_sock->recv_n)
1082 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1084 pr_err("Received out of sequence I PDU\n");
1086 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1087 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1089 * I frames will be freed from the socket layer, so we
1090 * need to keep them alive until someone receives them.
1094 pr_err("Receive queue is full\n");
1098 /* Remove skbs from the pending queue */
1099 if (llcp_sock->send_ack_n != nr) {
1100 struct sk_buff *s, *tmp;
1103 llcp_sock->send_ack_n = nr;
1105 /* Remove and free all skbs until ns == nr */
1106 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1109 skb_unlink(s, &llcp_sock->tx_pending_queue);
1116 /* Re-queue the remaining skbs for transmission */
1117 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1119 skb_unlink(s, &llcp_sock->tx_pending_queue);
1120 skb_queue_head(&local->tx_queue, s);
1124 if (ptype == LLCP_PDU_RR)
1125 llcp_sock->remote_ready = true;
1126 else if (ptype == LLCP_PDU_RNR)
1127 llcp_sock->remote_ready = false;
1129 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1130 nfc_llcp_send_rr(llcp_sock);
1133 nfc_llcp_sock_put(llcp_sock);
1136 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1137 const struct sk_buff *skb)
1139 struct nfc_llcp_sock *llcp_sock;
1143 dsap = nfc_llcp_dsap(skb);
1144 ssap = nfc_llcp_ssap(skb);
1146 if ((dsap == 0) && (ssap == 0)) {
1147 pr_debug("Connection termination");
1148 nfc_dep_link_down(local->dev);
1152 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1153 if (llcp_sock == NULL) {
1154 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1158 sk = &llcp_sock->sk;
1161 nfc_llcp_socket_purge(llcp_sock);
1163 if (sk->sk_state == LLCP_CLOSED) {
1165 nfc_llcp_sock_put(llcp_sock);
1168 if (sk->sk_state == LLCP_CONNECTED) {
1169 nfc_put_device(local->dev);
1170 sk->sk_state = LLCP_CLOSED;
1171 sk->sk_state_change(sk);
1174 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1177 nfc_llcp_sock_put(llcp_sock);
1180 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local,
1181 const struct sk_buff *skb)
1183 struct nfc_llcp_sock *llcp_sock;
1187 dsap = nfc_llcp_dsap(skb);
1188 ssap = nfc_llcp_ssap(skb);
1190 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1191 if (llcp_sock == NULL) {
1192 pr_err("Invalid CC\n");
1193 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1198 sk = &llcp_sock->sk;
1200 /* Unlink from connecting and link to the client array */
1201 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1202 nfc_llcp_sock_link(&local->sockets, sk);
1203 llcp_sock->dsap = ssap;
1205 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1206 skb->len - LLCP_HEADER_SIZE);
1208 sk->sk_state = LLCP_CONNECTED;
1209 sk->sk_state_change(sk);
1211 nfc_llcp_sock_put(llcp_sock);
1214 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local,
1215 const struct sk_buff *skb)
1217 struct nfc_llcp_sock *llcp_sock;
1219 u8 dsap, ssap, reason;
1221 dsap = nfc_llcp_dsap(skb);
1222 ssap = nfc_llcp_ssap(skb);
1223 reason = skb->data[2];
1225 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1228 case LLCP_DM_NOBOUND:
1230 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1234 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1238 if (llcp_sock == NULL) {
1239 pr_debug("Already closed\n");
1243 sk = &llcp_sock->sk;
1246 sk->sk_state = LLCP_CLOSED;
1247 sk->sk_state_change(sk);
1249 nfc_llcp_sock_put(llcp_sock);
1252 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1253 const struct sk_buff *skb)
1255 struct nfc_llcp_sock *llcp_sock;
1256 u8 dsap, ssap, type, length, tid, sap;
1258 u16 tlv_len, offset;
1259 const char *service_name;
1260 size_t service_name_len;
1261 struct nfc_llcp_sdp_tlv *sdp;
1262 HLIST_HEAD(llc_sdres_list);
1263 size_t sdres_tlvs_len;
1264 HLIST_HEAD(nl_sdres_list);
1266 dsap = nfc_llcp_dsap(skb);
1267 ssap = nfc_llcp_ssap(skb);
1269 pr_debug("%d %d\n", dsap, ssap);
1271 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1272 pr_err("Wrong SNL SAP\n");
1276 tlv = &skb->data[LLCP_HEADER_SIZE];
1277 tlv_len = skb->len - LLCP_HEADER_SIZE;
1281 while (offset < tlv_len) {
1286 case LLCP_TLV_SDREQ:
1288 service_name = (char *) &tlv[3];
1289 service_name_len = length - 1;
1291 pr_debug("Looking for %.16s\n", service_name);
1293 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1294 !strncmp(service_name, "urn:nfc:sn:sdp",
1295 service_name_len)) {
1300 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1308 * We found a socket but its ssap has not been reserved
1309 * yet. We need to assign it for good and send a reply.
1310 * The ssap will be freed when the socket is closed.
1312 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1313 atomic_t *client_count;
1315 sap = nfc_llcp_reserve_sdp_ssap(local);
1317 pr_debug("Reserving %d\n", sap);
1319 if (sap == LLCP_SAP_MAX) {
1325 &local->local_sdp_cnt[sap -
1328 atomic_inc(client_count);
1330 llcp_sock->ssap = sap;
1331 llcp_sock->reserved_ssap = sap;
1333 sap = llcp_sock->ssap;
1336 pr_debug("%p %d\n", llcp_sock, sap);
1339 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1343 sdres_tlvs_len += sdp->tlv_len;
1344 hlist_add_head(&sdp->node, &llc_sdres_list);
1347 case LLCP_TLV_SDRES:
1348 mutex_lock(&local->sdreq_lock);
1350 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1352 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1353 if (sdp->tid != tlv[2])
1358 pr_debug("Found: uri=%s, sap=%d\n",
1359 sdp->uri, sdp->sap);
1361 hlist_del(&sdp->node);
1363 hlist_add_head(&sdp->node, &nl_sdres_list);
1368 mutex_unlock(&local->sdreq_lock);
1372 pr_err("Invalid SNL tlv value 0x%x\n", type);
1376 offset += length + 2;
1381 if (!hlist_empty(&nl_sdres_list))
1382 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1384 if (!hlist_empty(&llc_sdres_list))
1385 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1388 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1392 struct sk_buff *new_skb;
1394 if (skb->len <= LLCP_HEADER_SIZE) {
1395 pr_err("Malformed AGF PDU\n");
1399 skb_pull(skb, LLCP_HEADER_SIZE);
1401 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1402 pdu_len = skb->data[0] << 8 | skb->data[1];
1404 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1406 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1407 pr_err("Malformed AGF PDU\n");
1411 ptype = nfc_llcp_ptype(skb);
1413 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1416 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1417 if (new_skb == NULL) {
1418 pr_err("Could not allocate PDU\n");
1422 skb_put_data(new_skb, skb->data, pdu_len);
1424 nfc_llcp_rx_skb(local, new_skb);
1428 skb_pull(skb, pdu_len);
1432 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1434 u8 dsap, ssap, ptype;
1436 ptype = nfc_llcp_ptype(skb);
1437 dsap = nfc_llcp_dsap(skb);
1438 ssap = nfc_llcp_ssap(skb);
1440 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1442 if (ptype != LLCP_PDU_SYMM)
1443 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1444 skb->data, skb->len, true);
1453 nfc_llcp_recv_ui(local, skb);
1456 case LLCP_PDU_CONNECT:
1457 pr_debug("CONNECT\n");
1458 nfc_llcp_recv_connect(local, skb);
1463 nfc_llcp_recv_disc(local, skb);
1468 nfc_llcp_recv_cc(local, skb);
1473 nfc_llcp_recv_dm(local, skb);
1478 nfc_llcp_recv_snl(local, skb);
1484 pr_debug("I frame\n");
1485 nfc_llcp_recv_hdlc(local, skb);
1489 pr_debug("AGF frame\n");
1490 nfc_llcp_recv_agf(local, skb);
1495 static void nfc_llcp_rx_work(struct work_struct *work)
1497 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1499 struct sk_buff *skb;
1501 skb = local->rx_pending;
1503 pr_debug("No pending SKB\n");
1507 __net_timestamp(skb);
1509 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1511 nfc_llcp_rx_skb(local, skb);
1513 schedule_work(&local->tx_work);
1514 kfree_skb(local->rx_pending);
1515 local->rx_pending = NULL;
1518 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1520 local->rx_pending = skb;
1521 del_timer(&local->link_timer);
1522 schedule_work(&local->rx_work);
1525 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1527 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1530 pr_err("LLCP PDU receive err %d\n", err);
1534 __nfc_llcp_recv(local, skb);
1537 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1539 struct nfc_llcp_local *local;
1541 local = nfc_llcp_find_local(dev);
1542 if (local == NULL) {
1547 __nfc_llcp_recv(local, skb);
1549 nfc_llcp_local_put(local);
1554 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1556 struct nfc_llcp_local *local;
1558 local = nfc_llcp_find_local(dev);
1562 local->remote_miu = LLCP_DEFAULT_MIU;
1563 local->remote_lto = LLCP_DEFAULT_LTO;
1565 /* Close and purge all existing sockets */
1566 nfc_llcp_socket_release(local, true, 0);
1568 nfc_llcp_local_put(local);
1571 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1572 u8 comm_mode, u8 rf_mode)
1574 struct nfc_llcp_local *local;
1576 pr_debug("rf mode %d\n", rf_mode);
1578 local = nfc_llcp_find_local(dev);
1582 local->target_idx = target_idx;
1583 local->comm_mode = comm_mode;
1584 local->rf_mode = rf_mode;
1586 if (rf_mode == NFC_RF_INITIATOR) {
1587 pr_debug("Queueing Tx work\n");
1589 schedule_work(&local->tx_work);
1591 mod_timer(&local->link_timer,
1592 jiffies + msecs_to_jiffies(local->remote_lto));
1595 nfc_llcp_local_put(local);
1598 int nfc_llcp_register_device(struct nfc_dev *ndev)
1600 struct nfc_llcp_local *local;
1602 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1607 INIT_LIST_HEAD(&local->list);
1608 kref_init(&local->ref);
1609 mutex_init(&local->sdp_lock);
1610 timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0);
1612 skb_queue_head_init(&local->tx_queue);
1613 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1615 local->rx_pending = NULL;
1616 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1618 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1620 rwlock_init(&local->sockets.lock);
1621 rwlock_init(&local->connecting_sockets.lock);
1622 rwlock_init(&local->raw_sockets.lock);
1624 local->lto = 150; /* 1500 ms */
1625 local->rw = LLCP_MAX_RW;
1626 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1627 local->local_wks = 0x1; /* LLC Link Management */
1629 nfc_llcp_build_gb(local);
1631 local->remote_miu = LLCP_DEFAULT_MIU;
1632 local->remote_lto = LLCP_DEFAULT_LTO;
1634 mutex_init(&local->sdreq_lock);
1635 INIT_HLIST_HEAD(&local->pending_sdreqs);
1636 timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
1637 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1639 list_add(&local->list, &llcp_devices);
1644 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1646 struct nfc_llcp_local *local = nfc_llcp_remove_local(dev);
1648 if (local == NULL) {
1649 pr_debug("No such device\n");
1653 local_cleanup(local);
1655 nfc_llcp_local_put(local);
1658 int __init nfc_llcp_init(void)
1660 return nfc_llcp_sock_init();
1663 void nfc_llcp_exit(void)
1665 nfc_llcp_sock_exit();