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);
21 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
23 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
26 sk_add_node(sk, &l->head);
27 write_unlock(&l->lock);
30 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
34 write_unlock(&l->lock);
37 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
39 sock->remote_rw = LLCP_DEFAULT_RW;
40 sock->remote_miu = LLCP_MAX_MIU + 1;
43 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
45 struct nfc_llcp_local *local = sock->local;
46 struct sk_buff *s, *tmp;
48 skb_queue_purge(&sock->tx_queue);
49 skb_queue_purge(&sock->tx_pending_queue);
54 /* Search for local pending SKBs that are related to this socket */
55 skb_queue_walk_safe(&local->tx_queue, s, tmp) {
56 if (s->sk != &sock->sk)
59 skb_unlink(s, &local->tx_queue);
64 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
68 struct hlist_node *tmp;
69 struct nfc_llcp_sock *llcp_sock;
71 skb_queue_purge(&local->tx_queue);
73 write_lock(&local->sockets.lock);
75 sk_for_each_safe(sk, tmp, &local->sockets.head) {
76 llcp_sock = nfc_llcp_sock(sk);
80 nfc_llcp_socket_purge(llcp_sock);
82 if (sk->sk_state == LLCP_CONNECTED)
83 nfc_put_device(llcp_sock->dev);
85 if (sk->sk_state == LLCP_LISTEN) {
86 struct nfc_llcp_sock *lsk, *n;
87 struct sock *accept_sk;
89 list_for_each_entry_safe(lsk, n,
90 &llcp_sock->accept_queue,
93 bh_lock_sock(accept_sk);
95 nfc_llcp_accept_unlink(accept_sk);
98 accept_sk->sk_err = err;
99 accept_sk->sk_state = LLCP_CLOSED;
100 accept_sk->sk_state_change(sk);
102 bh_unlock_sock(accept_sk);
108 sk->sk_state = LLCP_CLOSED;
109 sk->sk_state_change(sk);
113 sk_del_node_init(sk);
116 write_unlock(&local->sockets.lock);
118 /* If we still have a device, we keep the RAW sockets alive */
122 write_lock(&local->raw_sockets.lock);
124 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
125 llcp_sock = nfc_llcp_sock(sk);
129 nfc_llcp_socket_purge(llcp_sock);
133 sk->sk_state = LLCP_CLOSED;
134 sk->sk_state_change(sk);
138 sk_del_node_init(sk);
141 write_unlock(&local->raw_sockets.lock);
144 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
146 kref_get(&local->ref);
151 static void local_cleanup(struct nfc_llcp_local *local)
153 nfc_llcp_socket_release(local, false, ENXIO);
154 del_timer_sync(&local->link_timer);
155 skb_queue_purge(&local->tx_queue);
156 cancel_work_sync(&local->tx_work);
157 cancel_work_sync(&local->rx_work);
158 cancel_work_sync(&local->timeout_work);
159 kfree_skb(local->rx_pending);
160 local->rx_pending = NULL;
161 del_timer_sync(&local->sdreq_timer);
162 cancel_work_sync(&local->sdreq_timeout_work);
163 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
166 static void local_release(struct kref *ref)
168 struct nfc_llcp_local *local;
170 local = container_of(ref, struct nfc_llcp_local, ref);
172 list_del(&local->list);
173 local_cleanup(local);
177 int nfc_llcp_local_put(struct nfc_llcp_local *local)
182 return kref_put(&local->ref, local_release);
185 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
189 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
191 pr_debug("ssap dsap %d %d\n", ssap, dsap);
193 if (ssap == 0 && dsap == 0)
196 read_lock(&local->sockets.lock);
200 sk_for_each(sk, &local->sockets.head) {
201 tmp_sock = nfc_llcp_sock(sk);
203 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
204 llcp_sock = tmp_sock;
209 read_unlock(&local->sockets.lock);
211 if (llcp_sock == NULL)
214 sock_hold(&llcp_sock->sk);
219 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
224 static void nfc_llcp_timeout_work(struct work_struct *work)
226 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
229 nfc_dep_link_down(local->dev);
232 static void nfc_llcp_symm_timer(struct timer_list *t)
234 struct nfc_llcp_local *local = from_timer(local, t, link_timer);
236 pr_err("SYMM timeout\n");
238 schedule_work(&local->timeout_work);
241 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
244 HLIST_HEAD(nl_sdres_list);
245 struct hlist_node *n;
246 struct nfc_llcp_sdp_tlv *sdp;
247 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
250 mutex_lock(&local->sdreq_lock);
252 time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
254 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
255 if (time_after(sdp->time, time))
258 sdp->sap = LLCP_SDP_UNBOUND;
260 hlist_del(&sdp->node);
262 hlist_add_head(&sdp->node, &nl_sdres_list);
265 if (!hlist_empty(&local->pending_sdreqs))
266 mod_timer(&local->sdreq_timer,
267 jiffies + msecs_to_jiffies(3 * local->remote_lto));
269 mutex_unlock(&local->sdreq_lock);
271 if (!hlist_empty(&nl_sdres_list))
272 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
275 static void nfc_llcp_sdreq_timer(struct timer_list *t)
277 struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer);
279 schedule_work(&local->sdreq_timeout_work);
282 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
284 struct nfc_llcp_local *local;
286 list_for_each_entry(local, &llcp_devices, list)
287 if (local->dev == dev)
290 pr_debug("No device found\n");
295 static char *wks[] = {
303 static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len)
307 pr_debug("%s\n", service_name);
309 if (service_name == NULL)
312 num_wks = ARRAY_SIZE(wks);
314 for (sap = 0; sap < num_wks; sap++) {
315 if (wks[sap] == NULL)
318 if (strncmp(wks[sap], service_name, service_name_len) == 0)
326 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
327 const u8 *sn, size_t sn_len)
330 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
332 pr_debug("sn %zd %p\n", sn_len, sn);
334 if (sn == NULL || sn_len == 0)
337 read_lock(&local->sockets.lock);
341 sk_for_each(sk, &local->sockets.head) {
342 tmp_sock = nfc_llcp_sock(sk);
344 pr_debug("llcp sock %p\n", tmp_sock);
346 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
347 tmp_sock->sk.sk_state != LLCP_LISTEN)
350 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
351 tmp_sock->sk.sk_state != LLCP_BOUND)
354 if (tmp_sock->service_name == NULL ||
355 tmp_sock->service_name_len == 0)
358 if (tmp_sock->service_name_len != sn_len)
361 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
362 llcp_sock = tmp_sock;
367 read_unlock(&local->sockets.lock);
369 pr_debug("Found llcp sock %p\n", llcp_sock);
374 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
375 struct nfc_llcp_sock *sock)
377 mutex_lock(&local->sdp_lock);
379 if (sock->service_name != NULL && sock->service_name_len > 0) {
380 int ssap = nfc_llcp_wks_sap(sock->service_name,
381 sock->service_name_len);
384 pr_debug("WKS %d\n", ssap);
386 /* This is a WKS, let's check if it's free */
387 if (test_bit(ssap, &local->local_wks)) {
388 mutex_unlock(&local->sdp_lock);
393 set_bit(ssap, &local->local_wks);
394 mutex_unlock(&local->sdp_lock);
400 * Check if there already is a non WKS socket bound
401 * to this service name.
403 if (nfc_llcp_sock_from_sn(local, sock->service_name,
404 sock->service_name_len) != NULL) {
405 mutex_unlock(&local->sdp_lock);
410 mutex_unlock(&local->sdp_lock);
412 return LLCP_SDP_UNBOUND;
414 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
415 if (!test_bit(sock->ssap, &local->local_wks)) {
416 set_bit(sock->ssap, &local->local_wks);
417 mutex_unlock(&local->sdp_lock);
423 mutex_unlock(&local->sdp_lock);
428 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
432 mutex_lock(&local->sdp_lock);
434 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
435 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
436 mutex_unlock(&local->sdp_lock);
440 set_bit(local_ssap, &local->local_sap);
442 mutex_unlock(&local->sdp_lock);
444 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
447 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
452 if (ssap < LLCP_WKS_NUM_SAP) {
454 sdp = &local->local_wks;
455 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
456 atomic_t *client_cnt;
458 local_ssap = ssap - LLCP_WKS_NUM_SAP;
459 sdp = &local->local_sdp;
460 client_cnt = &local->local_sdp_cnt[local_ssap];
462 pr_debug("%d clients\n", atomic_read(client_cnt));
464 mutex_lock(&local->sdp_lock);
466 if (atomic_dec_and_test(client_cnt)) {
467 struct nfc_llcp_sock *l_sock;
469 pr_debug("No more clients for SAP %d\n", ssap);
471 clear_bit(local_ssap, sdp);
473 /* Find the listening sock and set it back to UNBOUND */
474 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
476 l_sock->ssap = LLCP_SDP_UNBOUND;
477 nfc_llcp_sock_put(l_sock);
481 mutex_unlock(&local->sdp_lock);
484 } else if (ssap < LLCP_MAX_SAP) {
485 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
486 sdp = &local->local_sap;
491 mutex_lock(&local->sdp_lock);
493 clear_bit(local_ssap, sdp);
495 mutex_unlock(&local->sdp_lock);
498 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
502 mutex_lock(&local->sdp_lock);
504 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
505 if (ssap == LLCP_SDP_NUM_SAP) {
506 mutex_unlock(&local->sdp_lock);
511 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
513 set_bit(ssap, &local->local_sdp);
515 mutex_unlock(&local->sdp_lock);
517 return LLCP_WKS_NUM_SAP + ssap;
520 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
522 u8 *gb_cur, version, version_length;
523 u8 lto_length, wks_length, miux_length;
524 const u8 *version_tlv = NULL, *lto_tlv = NULL,
525 *wks_tlv = NULL, *miux_tlv = NULL;
526 __be16 wks = cpu_to_be16(local->local_wks);
530 version = LLCP_VERSION_11;
531 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
537 gb_len += version_length;
539 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length);
544 gb_len += lto_length;
546 pr_debug("Local wks 0x%lx\n", local->local_wks);
547 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
552 gb_len += wks_length;
554 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
560 gb_len += miux_length;
562 gb_len += ARRAY_SIZE(llcp_magic);
564 if (gb_len > NFC_MAX_GT_LEN) {
571 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
572 gb_cur += ARRAY_SIZE(llcp_magic);
574 memcpy(gb_cur, version_tlv, version_length);
575 gb_cur += version_length;
577 memcpy(gb_cur, lto_tlv, lto_length);
578 gb_cur += lto_length;
580 memcpy(gb_cur, wks_tlv, wks_length);
581 gb_cur += wks_length;
583 memcpy(gb_cur, miux_tlv, miux_length);
584 gb_cur += miux_length;
586 local->gb_len = gb_len;
597 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
599 struct nfc_llcp_local *local;
601 local = nfc_llcp_find_local(dev);
603 *general_bytes_len = 0;
607 nfc_llcp_build_gb(local);
609 *general_bytes_len = local->gb_len;
614 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, const u8 *gb, u8 gb_len)
616 struct nfc_llcp_local *local;
618 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
621 local = nfc_llcp_find_local(dev);
623 pr_err("No LLCP device\n");
627 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
628 memcpy(local->remote_gb, gb, gb_len);
629 local->remote_gb_len = gb_len;
631 if (memcmp(local->remote_gb, llcp_magic, 3)) {
632 pr_err("MAC does not support LLCP\n");
636 return nfc_llcp_parse_gb_tlv(local,
637 &local->remote_gb[3],
638 local->remote_gb_len - 3);
641 static u8 nfc_llcp_dsap(const struct sk_buff *pdu)
643 return (pdu->data[0] & 0xfc) >> 2;
646 static u8 nfc_llcp_ptype(const struct sk_buff *pdu)
648 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
651 static u8 nfc_llcp_ssap(const struct sk_buff *pdu)
653 return pdu->data[1] & 0x3f;
656 static u8 nfc_llcp_ns(const struct sk_buff *pdu)
658 return pdu->data[2] >> 4;
661 static u8 nfc_llcp_nr(const struct sk_buff *pdu)
663 return pdu->data[2] & 0xf;
666 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
668 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
669 sock->send_n = (sock->send_n + 1) % 16;
670 sock->recv_ack_n = (sock->recv_n - 1) % 16;
673 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
674 struct sk_buff *skb, u8 direction)
676 struct sk_buff *skb_copy = NULL, *nskb;
680 read_lock(&local->raw_sockets.lock);
682 sk_for_each(sk, &local->raw_sockets.head) {
683 if (sk->sk_state != LLCP_BOUND)
686 if (skb_copy == NULL) {
687 skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
690 if (skb_copy == NULL)
693 data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
695 data[0] = local->dev ? local->dev->idx : 0xFF;
696 data[1] = direction & 0x01;
697 data[1] |= (RAW_PAYLOAD_LLCP << 1);
700 nskb = skb_clone(skb_copy, GFP_ATOMIC);
704 if (sock_queue_rcv_skb(sk, nskb))
708 read_unlock(&local->raw_sockets.lock);
713 static void nfc_llcp_tx_work(struct work_struct *work)
715 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
719 struct nfc_llcp_sock *llcp_sock;
721 skb = skb_dequeue(&local->tx_queue);
724 llcp_sock = nfc_llcp_sock(sk);
726 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
728 nfc_llcp_send_symm(local->dev);
729 } else if (llcp_sock && !llcp_sock->remote_ready) {
730 skb_queue_head(&local->tx_queue, skb);
731 nfc_llcp_send_symm(local->dev);
733 struct sk_buff *copy_skb = NULL;
734 u8 ptype = nfc_llcp_ptype(skb);
737 pr_debug("Sending pending skb\n");
738 print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
739 16, 1, skb->data, skb->len, true);
741 if (ptype == LLCP_PDU_I)
742 copy_skb = skb_copy(skb, GFP_ATOMIC);
744 __net_timestamp(skb);
746 nfc_llcp_send_to_raw_sock(local, skb,
749 ret = nfc_data_exchange(local->dev, local->target_idx,
750 skb, nfc_llcp_recv, local);
757 if (ptype == LLCP_PDU_I && copy_skb)
758 skb_queue_tail(&llcp_sock->tx_pending_queue,
762 nfc_llcp_send_symm(local->dev);
766 mod_timer(&local->link_timer,
767 jiffies + msecs_to_jiffies(2 * local->remote_lto));
770 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
774 struct nfc_llcp_sock *llcp_sock;
776 read_lock(&local->connecting_sockets.lock);
778 sk_for_each(sk, &local->connecting_sockets.head) {
779 llcp_sock = nfc_llcp_sock(sk);
781 if (llcp_sock->ssap == ssap) {
782 sock_hold(&llcp_sock->sk);
790 read_unlock(&local->connecting_sockets.lock);
795 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
796 const u8 *sn, size_t sn_len)
798 struct nfc_llcp_sock *llcp_sock;
800 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
802 if (llcp_sock == NULL)
805 sock_hold(&llcp_sock->sk);
810 static const u8 *nfc_llcp_connect_sn(const struct sk_buff *skb, size_t *sn_len)
813 const u8 *tlv = &skb->data[2];
814 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
816 while (offset < tlv_array_len) {
820 pr_debug("type 0x%x length %d\n", type, length);
822 if (type == LLCP_TLV_SN) {
827 offset += length + 2;
834 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
837 struct nfc_llcp_sock *llcp_sock;
838 struct nfc_llcp_ui_cb *ui_cb;
841 dsap = nfc_llcp_dsap(skb);
842 ssap = nfc_llcp_ssap(skb);
844 ui_cb = nfc_llcp_ui_skb_cb(skb);
848 pr_debug("%d %d\n", dsap, ssap);
850 /* We're looking for a bound socket, not a client one */
851 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
852 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
855 /* There is no sequence with UI frames */
856 skb_pull(skb, LLCP_HEADER_SIZE);
857 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
859 * UI frames will be freed from the socket layer, so we
860 * need to keep them alive until someone receives them.
864 pr_err("Receive queue is full\n");
867 nfc_llcp_sock_put(llcp_sock);
870 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
871 const struct sk_buff *skb)
873 struct sock *new_sk, *parent;
874 struct nfc_llcp_sock *sock, *new_sock;
875 u8 dsap, ssap, reason;
877 dsap = nfc_llcp_dsap(skb);
878 ssap = nfc_llcp_ssap(skb);
880 pr_debug("%d %d\n", dsap, ssap);
882 if (dsap != LLCP_SAP_SDP) {
883 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
884 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
885 reason = LLCP_DM_NOBOUND;
892 sn = nfc_llcp_connect_sn(skb, &sn_len);
894 reason = LLCP_DM_NOBOUND;
898 pr_debug("Service name length %zu\n", sn_len);
900 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
902 reason = LLCP_DM_NOBOUND;
907 lock_sock(&sock->sk);
911 if (sk_acceptq_is_full(parent)) {
912 reason = LLCP_DM_REJ;
913 release_sock(&sock->sk);
918 if (sock->ssap == LLCP_SDP_UNBOUND) {
919 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
921 pr_debug("First client, reserving %d\n", ssap);
923 if (ssap == LLCP_SAP_MAX) {
924 reason = LLCP_DM_REJ;
925 release_sock(&sock->sk);
933 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
934 if (new_sk == NULL) {
935 reason = LLCP_DM_REJ;
936 release_sock(&sock->sk);
941 new_sock = nfc_llcp_sock(new_sk);
942 new_sock->dev = local->dev;
943 new_sock->local = nfc_llcp_local_get(local);
944 new_sock->rw = sock->rw;
945 new_sock->miux = sock->miux;
946 new_sock->nfc_protocol = sock->nfc_protocol;
947 new_sock->dsap = ssap;
948 new_sock->target_idx = local->target_idx;
949 new_sock->parent = parent;
950 new_sock->ssap = sock->ssap;
951 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
952 atomic_t *client_count;
954 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
957 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
959 atomic_inc(client_count);
960 new_sock->reserved_ssap = sock->ssap;
963 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
964 skb->len - LLCP_HEADER_SIZE);
966 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
968 nfc_llcp_sock_link(&local->sockets, new_sk);
970 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
972 nfc_get_device(local->dev->idx);
974 new_sk->sk_state = LLCP_CONNECTED;
976 /* Wake the listening processes */
977 parent->sk_data_ready(parent);
980 nfc_llcp_send_cc(new_sock);
982 release_sock(&sock->sk);
989 nfc_llcp_send_dm(local, dsap, ssap, reason);
992 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
995 struct nfc_llcp_local *local = sock->local;
997 pr_debug("Remote ready %d tx queue len %d remote rw %d",
998 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1001 /* Try to queue some I frames for transmission */
1002 while (sock->remote_ready &&
1003 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1004 struct sk_buff *pdu;
1006 pdu = skb_dequeue(&sock->tx_queue);
1010 /* Update N(S)/N(R) */
1011 nfc_llcp_set_nrns(sock, pdu);
1013 skb_queue_tail(&local->tx_queue, pdu);
1020 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1021 struct sk_buff *skb)
1023 struct nfc_llcp_sock *llcp_sock;
1025 u8 dsap, ssap, ptype, ns, nr;
1027 ptype = nfc_llcp_ptype(skb);
1028 dsap = nfc_llcp_dsap(skb);
1029 ssap = nfc_llcp_ssap(skb);
1030 ns = nfc_llcp_ns(skb);
1031 nr = nfc_llcp_nr(skb);
1033 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1035 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1036 if (llcp_sock == NULL) {
1037 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1041 sk = &llcp_sock->sk;
1043 if (sk->sk_state == LLCP_CLOSED) {
1045 nfc_llcp_sock_put(llcp_sock);
1048 /* Pass the payload upstream */
1049 if (ptype == LLCP_PDU_I) {
1050 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1052 if (ns == llcp_sock->recv_n)
1053 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1055 pr_err("Received out of sequence I PDU\n");
1057 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1058 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1060 * I frames will be freed from the socket layer, so we
1061 * need to keep them alive until someone receives them.
1065 pr_err("Receive queue is full\n");
1069 /* Remove skbs from the pending queue */
1070 if (llcp_sock->send_ack_n != nr) {
1071 struct sk_buff *s, *tmp;
1074 llcp_sock->send_ack_n = nr;
1076 /* Remove and free all skbs until ns == nr */
1077 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1080 skb_unlink(s, &llcp_sock->tx_pending_queue);
1087 /* Re-queue the remaining skbs for transmission */
1088 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1090 skb_unlink(s, &llcp_sock->tx_pending_queue);
1091 skb_queue_head(&local->tx_queue, s);
1095 if (ptype == LLCP_PDU_RR)
1096 llcp_sock->remote_ready = true;
1097 else if (ptype == LLCP_PDU_RNR)
1098 llcp_sock->remote_ready = false;
1100 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1101 nfc_llcp_send_rr(llcp_sock);
1104 nfc_llcp_sock_put(llcp_sock);
1107 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1108 const struct sk_buff *skb)
1110 struct nfc_llcp_sock *llcp_sock;
1114 dsap = nfc_llcp_dsap(skb);
1115 ssap = nfc_llcp_ssap(skb);
1117 if ((dsap == 0) && (ssap == 0)) {
1118 pr_debug("Connection termination");
1119 nfc_dep_link_down(local->dev);
1123 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1124 if (llcp_sock == NULL) {
1125 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1129 sk = &llcp_sock->sk;
1132 nfc_llcp_socket_purge(llcp_sock);
1134 if (sk->sk_state == LLCP_CLOSED) {
1136 nfc_llcp_sock_put(llcp_sock);
1139 if (sk->sk_state == LLCP_CONNECTED) {
1140 nfc_put_device(local->dev);
1141 sk->sk_state = LLCP_CLOSED;
1142 sk->sk_state_change(sk);
1145 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1148 nfc_llcp_sock_put(llcp_sock);
1151 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local,
1152 const struct sk_buff *skb)
1154 struct nfc_llcp_sock *llcp_sock;
1158 dsap = nfc_llcp_dsap(skb);
1159 ssap = nfc_llcp_ssap(skb);
1161 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1162 if (llcp_sock == NULL) {
1163 pr_err("Invalid CC\n");
1164 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1169 sk = &llcp_sock->sk;
1171 /* Unlink from connecting and link to the client array */
1172 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1173 nfc_llcp_sock_link(&local->sockets, sk);
1174 llcp_sock->dsap = ssap;
1176 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1177 skb->len - LLCP_HEADER_SIZE);
1179 sk->sk_state = LLCP_CONNECTED;
1180 sk->sk_state_change(sk);
1182 nfc_llcp_sock_put(llcp_sock);
1185 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local,
1186 const struct sk_buff *skb)
1188 struct nfc_llcp_sock *llcp_sock;
1190 u8 dsap, ssap, reason;
1192 dsap = nfc_llcp_dsap(skb);
1193 ssap = nfc_llcp_ssap(skb);
1194 reason = skb->data[2];
1196 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1199 case LLCP_DM_NOBOUND:
1201 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1205 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1209 if (llcp_sock == NULL) {
1210 pr_debug("Already closed\n");
1214 sk = &llcp_sock->sk;
1217 sk->sk_state = LLCP_CLOSED;
1218 sk->sk_state_change(sk);
1220 nfc_llcp_sock_put(llcp_sock);
1223 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1224 const struct sk_buff *skb)
1226 struct nfc_llcp_sock *llcp_sock;
1227 u8 dsap, ssap, type, length, tid, sap;
1229 u16 tlv_len, offset;
1230 const char *service_name;
1231 size_t service_name_len;
1232 struct nfc_llcp_sdp_tlv *sdp;
1233 HLIST_HEAD(llc_sdres_list);
1234 size_t sdres_tlvs_len;
1235 HLIST_HEAD(nl_sdres_list);
1237 dsap = nfc_llcp_dsap(skb);
1238 ssap = nfc_llcp_ssap(skb);
1240 pr_debug("%d %d\n", dsap, ssap);
1242 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1243 pr_err("Wrong SNL SAP\n");
1247 tlv = &skb->data[LLCP_HEADER_SIZE];
1248 tlv_len = skb->len - LLCP_HEADER_SIZE;
1252 while (offset < tlv_len) {
1257 case LLCP_TLV_SDREQ:
1259 service_name = (char *) &tlv[3];
1260 service_name_len = length - 1;
1262 pr_debug("Looking for %.16s\n", service_name);
1264 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1265 !strncmp(service_name, "urn:nfc:sn:sdp",
1266 service_name_len)) {
1271 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1279 * We found a socket but its ssap has not been reserved
1280 * yet. We need to assign it for good and send a reply.
1281 * The ssap will be freed when the socket is closed.
1283 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1284 atomic_t *client_count;
1286 sap = nfc_llcp_reserve_sdp_ssap(local);
1288 pr_debug("Reserving %d\n", sap);
1290 if (sap == LLCP_SAP_MAX) {
1296 &local->local_sdp_cnt[sap -
1299 atomic_inc(client_count);
1301 llcp_sock->ssap = sap;
1302 llcp_sock->reserved_ssap = sap;
1304 sap = llcp_sock->ssap;
1307 pr_debug("%p %d\n", llcp_sock, sap);
1310 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1314 sdres_tlvs_len += sdp->tlv_len;
1315 hlist_add_head(&sdp->node, &llc_sdres_list);
1318 case LLCP_TLV_SDRES:
1319 mutex_lock(&local->sdreq_lock);
1321 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1323 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1324 if (sdp->tid != tlv[2])
1329 pr_debug("Found: uri=%s, sap=%d\n",
1330 sdp->uri, sdp->sap);
1332 hlist_del(&sdp->node);
1334 hlist_add_head(&sdp->node, &nl_sdres_list);
1339 mutex_unlock(&local->sdreq_lock);
1343 pr_err("Invalid SNL tlv value 0x%x\n", type);
1347 offset += length + 2;
1352 if (!hlist_empty(&nl_sdres_list))
1353 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1355 if (!hlist_empty(&llc_sdres_list))
1356 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1359 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1363 struct sk_buff *new_skb;
1365 if (skb->len <= LLCP_HEADER_SIZE) {
1366 pr_err("Malformed AGF PDU\n");
1370 skb_pull(skb, LLCP_HEADER_SIZE);
1372 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1373 pdu_len = skb->data[0] << 8 | skb->data[1];
1375 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1377 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1378 pr_err("Malformed AGF PDU\n");
1382 ptype = nfc_llcp_ptype(skb);
1384 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1387 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1388 if (new_skb == NULL) {
1389 pr_err("Could not allocate PDU\n");
1393 skb_put_data(new_skb, skb->data, pdu_len);
1395 nfc_llcp_rx_skb(local, new_skb);
1399 skb_pull(skb, pdu_len);
1403 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1405 u8 dsap, ssap, ptype;
1407 ptype = nfc_llcp_ptype(skb);
1408 dsap = nfc_llcp_dsap(skb);
1409 ssap = nfc_llcp_ssap(skb);
1411 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1413 if (ptype != LLCP_PDU_SYMM)
1414 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1415 skb->data, skb->len, true);
1424 nfc_llcp_recv_ui(local, skb);
1427 case LLCP_PDU_CONNECT:
1428 pr_debug("CONNECT\n");
1429 nfc_llcp_recv_connect(local, skb);
1434 nfc_llcp_recv_disc(local, skb);
1439 nfc_llcp_recv_cc(local, skb);
1444 nfc_llcp_recv_dm(local, skb);
1449 nfc_llcp_recv_snl(local, skb);
1455 pr_debug("I frame\n");
1456 nfc_llcp_recv_hdlc(local, skb);
1460 pr_debug("AGF frame\n");
1461 nfc_llcp_recv_agf(local, skb);
1466 static void nfc_llcp_rx_work(struct work_struct *work)
1468 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1470 struct sk_buff *skb;
1472 skb = local->rx_pending;
1474 pr_debug("No pending SKB\n");
1478 __net_timestamp(skb);
1480 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1482 nfc_llcp_rx_skb(local, skb);
1484 schedule_work(&local->tx_work);
1485 kfree_skb(local->rx_pending);
1486 local->rx_pending = NULL;
1489 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1491 local->rx_pending = skb;
1492 del_timer(&local->link_timer);
1493 schedule_work(&local->rx_work);
1496 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1498 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1501 pr_err("LLCP PDU receive err %d\n", err);
1505 __nfc_llcp_recv(local, skb);
1508 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1510 struct nfc_llcp_local *local;
1512 local = nfc_llcp_find_local(dev);
1513 if (local == NULL) {
1518 __nfc_llcp_recv(local, skb);
1523 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1525 struct nfc_llcp_local *local;
1527 local = nfc_llcp_find_local(dev);
1531 local->remote_miu = LLCP_DEFAULT_MIU;
1532 local->remote_lto = LLCP_DEFAULT_LTO;
1534 /* Close and purge all existing sockets */
1535 nfc_llcp_socket_release(local, true, 0);
1538 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1539 u8 comm_mode, u8 rf_mode)
1541 struct nfc_llcp_local *local;
1543 pr_debug("rf mode %d\n", rf_mode);
1545 local = nfc_llcp_find_local(dev);
1549 local->target_idx = target_idx;
1550 local->comm_mode = comm_mode;
1551 local->rf_mode = rf_mode;
1553 if (rf_mode == NFC_RF_INITIATOR) {
1554 pr_debug("Queueing Tx work\n");
1556 schedule_work(&local->tx_work);
1558 mod_timer(&local->link_timer,
1559 jiffies + msecs_to_jiffies(local->remote_lto));
1563 int nfc_llcp_register_device(struct nfc_dev *ndev)
1565 struct nfc_llcp_local *local;
1567 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1572 INIT_LIST_HEAD(&local->list);
1573 kref_init(&local->ref);
1574 mutex_init(&local->sdp_lock);
1575 timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0);
1577 skb_queue_head_init(&local->tx_queue);
1578 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1580 local->rx_pending = NULL;
1581 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1583 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1585 rwlock_init(&local->sockets.lock);
1586 rwlock_init(&local->connecting_sockets.lock);
1587 rwlock_init(&local->raw_sockets.lock);
1589 local->lto = 150; /* 1500 ms */
1590 local->rw = LLCP_MAX_RW;
1591 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1592 local->local_wks = 0x1; /* LLC Link Management */
1594 nfc_llcp_build_gb(local);
1596 local->remote_miu = LLCP_DEFAULT_MIU;
1597 local->remote_lto = LLCP_DEFAULT_LTO;
1599 mutex_init(&local->sdreq_lock);
1600 INIT_HLIST_HEAD(&local->pending_sdreqs);
1601 timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
1602 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1604 list_add(&local->list, &llcp_devices);
1609 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1611 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1613 if (local == NULL) {
1614 pr_debug("No such device\n");
1618 local_cleanup(local);
1620 nfc_llcp_local_put(local);
1623 int __init nfc_llcp_init(void)
1625 return nfc_llcp_sock_init();
1628 void nfc_llcp_exit(void)
1630 nfc_llcp_sock_exit();