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();