2 * Copyright (C) 2011 Intel Corporation. All rights reserved.
3 * Copyright (C) 2014 Marvell International Ltd.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
21 #include <linux/init.h>
22 #include <linux/kernel.h>
23 #include <linux/list.h>
24 #include <linux/nfc.h>
29 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
31 static LIST_HEAD(llcp_devices);
33 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
35 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
38 sk_add_node(sk, &l->head);
39 write_unlock(&l->lock);
42 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
46 write_unlock(&l->lock);
49 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
51 sock->remote_rw = LLCP_DEFAULT_RW;
52 sock->remote_miu = LLCP_MAX_MIU + 1;
55 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
57 struct nfc_llcp_local *local = sock->local;
58 struct sk_buff *s, *tmp;
60 pr_debug("%p\n", &sock->sk);
62 skb_queue_purge(&sock->tx_queue);
63 skb_queue_purge(&sock->tx_pending_queue);
68 /* Search for local pending SKBs that are related to this socket */
69 skb_queue_walk_safe(&local->tx_queue, s, tmp) {
70 if (s->sk != &sock->sk)
73 skb_unlink(s, &local->tx_queue);
78 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
82 struct hlist_node *tmp;
83 struct nfc_llcp_sock *llcp_sock;
85 skb_queue_purge(&local->tx_queue);
87 write_lock(&local->sockets.lock);
89 sk_for_each_safe(sk, tmp, &local->sockets.head) {
90 llcp_sock = nfc_llcp_sock(sk);
94 nfc_llcp_socket_purge(llcp_sock);
96 if (sk->sk_state == LLCP_CONNECTED)
97 nfc_put_device(llcp_sock->dev);
99 if (sk->sk_state == LLCP_LISTEN) {
100 struct nfc_llcp_sock *lsk, *n;
101 struct sock *accept_sk;
103 list_for_each_entry_safe(lsk, n,
104 &llcp_sock->accept_queue,
106 accept_sk = &lsk->sk;
107 bh_lock_sock(accept_sk);
109 nfc_llcp_accept_unlink(accept_sk);
112 accept_sk->sk_err = err;
113 accept_sk->sk_state = LLCP_CLOSED;
114 accept_sk->sk_state_change(sk);
116 bh_unlock_sock(accept_sk);
122 sk->sk_state = LLCP_CLOSED;
123 sk->sk_state_change(sk);
127 sk_del_node_init(sk);
130 write_unlock(&local->sockets.lock);
132 /* If we still have a device, we keep the RAW sockets alive */
136 write_lock(&local->raw_sockets.lock);
138 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
139 llcp_sock = nfc_llcp_sock(sk);
143 nfc_llcp_socket_purge(llcp_sock);
147 sk->sk_state = LLCP_CLOSED;
148 sk->sk_state_change(sk);
152 sk_del_node_init(sk);
155 write_unlock(&local->raw_sockets.lock);
158 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
160 kref_get(&local->ref);
165 static void local_cleanup(struct nfc_llcp_local *local)
167 nfc_llcp_socket_release(local, false, ENXIO);
168 del_timer_sync(&local->link_timer);
169 skb_queue_purge(&local->tx_queue);
170 cancel_work_sync(&local->tx_work);
171 cancel_work_sync(&local->rx_work);
172 cancel_work_sync(&local->timeout_work);
173 kfree_skb(local->rx_pending);
174 del_timer_sync(&local->sdreq_timer);
175 cancel_work_sync(&local->sdreq_timeout_work);
176 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
179 static void local_release(struct kref *ref)
181 struct nfc_llcp_local *local;
183 local = container_of(ref, struct nfc_llcp_local, ref);
185 list_del(&local->list);
186 local_cleanup(local);
190 int nfc_llcp_local_put(struct nfc_llcp_local *local)
195 return kref_put(&local->ref, local_release);
198 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
202 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
204 pr_debug("ssap dsap %d %d\n", ssap, dsap);
206 if (ssap == 0 && dsap == 0)
209 read_lock(&local->sockets.lock);
213 sk_for_each(sk, &local->sockets.head) {
214 tmp_sock = nfc_llcp_sock(sk);
216 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
217 llcp_sock = tmp_sock;
222 read_unlock(&local->sockets.lock);
224 if (llcp_sock == NULL)
227 sock_hold(&llcp_sock->sk);
232 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
237 static void nfc_llcp_timeout_work(struct work_struct *work)
239 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
242 nfc_dep_link_down(local->dev);
245 static void nfc_llcp_symm_timer(unsigned long data)
247 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
249 pr_err("SYMM timeout\n");
251 schedule_work(&local->timeout_work);
254 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
257 HLIST_HEAD(nl_sdres_list);
258 struct hlist_node *n;
259 struct nfc_llcp_sdp_tlv *sdp;
260 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
263 mutex_lock(&local->sdreq_lock);
265 time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
267 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
268 if (time_after(sdp->time, time))
271 sdp->sap = LLCP_SDP_UNBOUND;
273 hlist_del(&sdp->node);
275 hlist_add_head(&sdp->node, &nl_sdres_list);
278 if (!hlist_empty(&local->pending_sdreqs))
279 mod_timer(&local->sdreq_timer,
280 jiffies + msecs_to_jiffies(3 * local->remote_lto));
282 mutex_unlock(&local->sdreq_lock);
284 if (!hlist_empty(&nl_sdres_list))
285 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
288 static void nfc_llcp_sdreq_timer(unsigned long data)
290 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
292 schedule_work(&local->sdreq_timeout_work);
295 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
297 struct nfc_llcp_local *local;
299 list_for_each_entry(local, &llcp_devices, list)
300 if (local->dev == dev)
303 pr_debug("No device found\n");
308 static char *wks[] = {
316 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
320 pr_debug("%s\n", service_name);
322 if (service_name == NULL)
325 num_wks = ARRAY_SIZE(wks);
327 for (sap = 0; sap < num_wks; sap++) {
328 if (wks[sap] == NULL)
331 if (strncmp(wks[sap], service_name, service_name_len) == 0)
339 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
340 u8 *sn, size_t sn_len)
343 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
345 pr_debug("sn %zd %p\n", sn_len, sn);
347 if (sn == NULL || sn_len == 0)
350 read_lock(&local->sockets.lock);
354 sk_for_each(sk, &local->sockets.head) {
355 tmp_sock = nfc_llcp_sock(sk);
357 pr_debug("llcp sock %p\n", tmp_sock);
359 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
360 tmp_sock->sk.sk_state != LLCP_LISTEN)
363 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
364 tmp_sock->sk.sk_state != LLCP_BOUND)
367 if (tmp_sock->service_name == NULL ||
368 tmp_sock->service_name_len == 0)
371 if (tmp_sock->service_name_len != sn_len)
374 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
375 llcp_sock = tmp_sock;
380 read_unlock(&local->sockets.lock);
382 pr_debug("Found llcp sock %p\n", llcp_sock);
387 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
388 struct nfc_llcp_sock *sock)
390 mutex_lock(&local->sdp_lock);
392 if (sock->service_name != NULL && sock->service_name_len > 0) {
393 int ssap = nfc_llcp_wks_sap(sock->service_name,
394 sock->service_name_len);
397 pr_debug("WKS %d\n", ssap);
399 /* This is a WKS, let's check if it's free */
400 if (local->local_wks & BIT(ssap)) {
401 mutex_unlock(&local->sdp_lock);
406 set_bit(ssap, &local->local_wks);
407 mutex_unlock(&local->sdp_lock);
413 * Check if there already is a non WKS socket bound
414 * to this service name.
416 if (nfc_llcp_sock_from_sn(local, sock->service_name,
417 sock->service_name_len) != NULL) {
418 mutex_unlock(&local->sdp_lock);
423 mutex_unlock(&local->sdp_lock);
425 return LLCP_SDP_UNBOUND;
427 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
428 if (!test_bit(sock->ssap, &local->local_wks)) {
429 set_bit(sock->ssap, &local->local_wks);
430 mutex_unlock(&local->sdp_lock);
436 mutex_unlock(&local->sdp_lock);
441 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
445 mutex_lock(&local->sdp_lock);
447 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
448 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
449 mutex_unlock(&local->sdp_lock);
453 set_bit(local_ssap, &local->local_sap);
455 mutex_unlock(&local->sdp_lock);
457 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
460 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
465 if (ssap < LLCP_WKS_NUM_SAP) {
467 sdp = &local->local_wks;
468 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
469 atomic_t *client_cnt;
471 local_ssap = ssap - LLCP_WKS_NUM_SAP;
472 sdp = &local->local_sdp;
473 client_cnt = &local->local_sdp_cnt[local_ssap];
475 pr_debug("%d clients\n", atomic_read(client_cnt));
477 mutex_lock(&local->sdp_lock);
479 if (atomic_dec_and_test(client_cnt)) {
480 struct nfc_llcp_sock *l_sock;
482 pr_debug("No more clients for SAP %d\n", ssap);
484 clear_bit(local_ssap, sdp);
486 /* Find the listening sock and set it back to UNBOUND */
487 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
489 l_sock->ssap = LLCP_SDP_UNBOUND;
490 nfc_llcp_sock_put(l_sock);
494 mutex_unlock(&local->sdp_lock);
497 } else if (ssap < LLCP_MAX_SAP) {
498 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
499 sdp = &local->local_sap;
504 mutex_lock(&local->sdp_lock);
506 clear_bit(local_ssap, sdp);
508 mutex_unlock(&local->sdp_lock);
511 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
515 mutex_lock(&local->sdp_lock);
517 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
518 if (ssap == LLCP_SDP_NUM_SAP) {
519 mutex_unlock(&local->sdp_lock);
524 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
526 set_bit(ssap, &local->local_sdp);
528 mutex_unlock(&local->sdp_lock);
530 return LLCP_WKS_NUM_SAP + ssap;
533 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
535 u8 *gb_cur, version, version_length;
536 u8 lto_length, wks_length, miux_length;
537 u8 *version_tlv = NULL, *lto_tlv = NULL,
538 *wks_tlv = NULL, *miux_tlv = NULL;
539 __be16 wks = cpu_to_be16(local->local_wks);
543 version = LLCP_VERSION_11;
544 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
550 gb_len += version_length;
552 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length);
557 gb_len += lto_length;
559 pr_debug("Local wks 0x%lx\n", local->local_wks);
560 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
565 gb_len += wks_length;
567 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
573 gb_len += miux_length;
575 gb_len += ARRAY_SIZE(llcp_magic);
577 if (gb_len > NFC_MAX_GT_LEN) {
584 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
585 gb_cur += ARRAY_SIZE(llcp_magic);
587 memcpy(gb_cur, version_tlv, version_length);
588 gb_cur += version_length;
590 memcpy(gb_cur, lto_tlv, lto_length);
591 gb_cur += lto_length;
593 memcpy(gb_cur, wks_tlv, wks_length);
594 gb_cur += wks_length;
596 memcpy(gb_cur, miux_tlv, miux_length);
597 gb_cur += miux_length;
599 local->gb_len = gb_len;
610 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
612 struct nfc_llcp_local *local;
614 local = nfc_llcp_find_local(dev);
616 *general_bytes_len = 0;
620 nfc_llcp_build_gb(local);
622 *general_bytes_len = local->gb_len;
627 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
629 struct nfc_llcp_local *local;
631 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
634 local = nfc_llcp_find_local(dev);
636 pr_err("No LLCP device\n");
640 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
641 memcpy(local->remote_gb, gb, gb_len);
642 local->remote_gb_len = gb_len;
644 if (memcmp(local->remote_gb, llcp_magic, 3)) {
645 pr_err("MAC does not support LLCP\n");
649 return nfc_llcp_parse_gb_tlv(local,
650 &local->remote_gb[3],
651 local->remote_gb_len - 3);
654 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
656 return (pdu->data[0] & 0xfc) >> 2;
659 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
661 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
664 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
666 return pdu->data[1] & 0x3f;
669 static u8 nfc_llcp_ns(struct sk_buff *pdu)
671 return pdu->data[2] >> 4;
674 static u8 nfc_llcp_nr(struct sk_buff *pdu)
676 return pdu->data[2] & 0xf;
679 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
681 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
682 sock->send_n = (sock->send_n + 1) % 16;
683 sock->recv_ack_n = (sock->recv_n - 1) % 16;
686 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
687 struct sk_buff *skb, u8 direction)
689 struct sk_buff *skb_copy = NULL, *nskb;
693 read_lock(&local->raw_sockets.lock);
695 sk_for_each(sk, &local->raw_sockets.head) {
696 if (sk->sk_state != LLCP_BOUND)
699 if (skb_copy == NULL) {
700 skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
703 if (skb_copy == NULL)
706 data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
708 data[0] = local->dev ? local->dev->idx : 0xFF;
709 data[1] = direction & 0x01;
710 data[1] |= (RAW_PAYLOAD_LLCP << 1);
713 nskb = skb_clone(skb_copy, GFP_ATOMIC);
717 if (sock_queue_rcv_skb(sk, nskb))
721 read_unlock(&local->raw_sockets.lock);
726 static void nfc_llcp_tx_work(struct work_struct *work)
728 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
732 struct nfc_llcp_sock *llcp_sock;
734 skb = skb_dequeue(&local->tx_queue);
737 llcp_sock = nfc_llcp_sock(sk);
739 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
741 nfc_llcp_send_symm(local->dev);
742 } else if (llcp_sock && !llcp_sock->remote_ready) {
743 skb_queue_head(&local->tx_queue, skb);
744 nfc_llcp_send_symm(local->dev);
746 struct sk_buff *copy_skb = NULL;
747 u8 ptype = nfc_llcp_ptype(skb);
750 pr_debug("Sending pending skb\n");
751 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
752 DUMP_PREFIX_OFFSET, 16, 1,
753 skb->data, skb->len, true);
755 if (ptype == LLCP_PDU_DISC && sk != NULL &&
756 sk->sk_state == LLCP_DISCONNECTING) {
757 nfc_llcp_sock_unlink(&local->sockets, sk);
762 if (ptype == LLCP_PDU_I)
763 copy_skb = skb_copy(skb, GFP_ATOMIC);
765 __net_timestamp(skb);
767 nfc_llcp_send_to_raw_sock(local, skb,
770 ret = nfc_data_exchange(local->dev, local->target_idx,
771 skb, nfc_llcp_recv, local);
778 if (ptype == LLCP_PDU_I && copy_skb)
779 skb_queue_tail(&llcp_sock->tx_pending_queue,
783 nfc_llcp_send_symm(local->dev);
787 mod_timer(&local->link_timer,
788 jiffies + msecs_to_jiffies(2 * local->remote_lto));
791 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
795 struct nfc_llcp_sock *llcp_sock;
797 read_lock(&local->connecting_sockets.lock);
799 sk_for_each(sk, &local->connecting_sockets.head) {
800 llcp_sock = nfc_llcp_sock(sk);
802 if (llcp_sock->ssap == ssap) {
803 sock_hold(&llcp_sock->sk);
811 read_unlock(&local->connecting_sockets.lock);
816 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
817 u8 *sn, size_t sn_len)
819 struct nfc_llcp_sock *llcp_sock;
821 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
823 if (llcp_sock == NULL)
826 sock_hold(&llcp_sock->sk);
831 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
833 u8 *tlv = &skb->data[2], type, length;
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,
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 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, struct sk_buff *skb)
1173 struct nfc_llcp_sock *llcp_sock;
1177 dsap = nfc_llcp_dsap(skb);
1178 ssap = nfc_llcp_ssap(skb);
1180 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1181 if (llcp_sock == NULL) {
1182 pr_err("Invalid CC\n");
1183 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1188 sk = &llcp_sock->sk;
1190 /* Unlink from connecting and link to the client array */
1191 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1192 nfc_llcp_sock_link(&local->sockets, sk);
1193 llcp_sock->dsap = ssap;
1195 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1196 skb->len - LLCP_HEADER_SIZE);
1198 sk->sk_state = LLCP_CONNECTED;
1199 sk->sk_state_change(sk);
1201 nfc_llcp_sock_put(llcp_sock);
1204 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1206 struct nfc_llcp_sock *llcp_sock;
1208 u8 dsap, ssap, reason;
1210 dsap = nfc_llcp_dsap(skb);
1211 ssap = nfc_llcp_ssap(skb);
1212 reason = skb->data[2];
1214 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1217 case LLCP_DM_NOBOUND:
1219 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1223 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1227 if (llcp_sock == NULL) {
1228 pr_debug("Already closed\n");
1232 sk = &llcp_sock->sk;
1235 sk->sk_state = LLCP_CLOSED;
1236 sk->sk_state_change(sk);
1238 nfc_llcp_sock_put(llcp_sock);
1241 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1242 struct sk_buff *skb)
1244 struct nfc_llcp_sock *llcp_sock;
1245 u8 dsap, ssap, *tlv, type, length, tid, sap;
1246 u16 tlv_len, offset;
1248 size_t service_name_len;
1249 struct nfc_llcp_sdp_tlv *sdp;
1250 HLIST_HEAD(llc_sdres_list);
1251 size_t sdres_tlvs_len;
1252 HLIST_HEAD(nl_sdres_list);
1254 dsap = nfc_llcp_dsap(skb);
1255 ssap = nfc_llcp_ssap(skb);
1257 pr_debug("%d %d\n", dsap, ssap);
1259 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1260 pr_err("Wrong SNL SAP\n");
1264 tlv = &skb->data[LLCP_HEADER_SIZE];
1265 tlv_len = skb->len - LLCP_HEADER_SIZE;
1269 while (offset < tlv_len) {
1274 case LLCP_TLV_SDREQ:
1276 service_name = (char *) &tlv[3];
1277 service_name_len = length - 1;
1279 pr_debug("Looking for %.16s\n", service_name);
1281 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1282 !strncmp(service_name, "urn:nfc:sn:sdp",
1283 service_name_len)) {
1288 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1296 * We found a socket but its ssap has not been reserved
1297 * yet. We need to assign it for good and send a reply.
1298 * The ssap will be freed when the socket is closed.
1300 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1301 atomic_t *client_count;
1303 sap = nfc_llcp_reserve_sdp_ssap(local);
1305 pr_debug("Reserving %d\n", sap);
1307 if (sap == LLCP_SAP_MAX) {
1313 &local->local_sdp_cnt[sap -
1316 atomic_inc(client_count);
1318 llcp_sock->ssap = sap;
1319 llcp_sock->reserved_ssap = sap;
1321 sap = llcp_sock->ssap;
1324 pr_debug("%p %d\n", llcp_sock, sap);
1327 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1331 sdres_tlvs_len += sdp->tlv_len;
1332 hlist_add_head(&sdp->node, &llc_sdres_list);
1335 case LLCP_TLV_SDRES:
1336 mutex_lock(&local->sdreq_lock);
1338 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1340 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1341 if (sdp->tid != tlv[2])
1346 pr_debug("Found: uri=%s, sap=%d\n",
1347 sdp->uri, sdp->sap);
1349 hlist_del(&sdp->node);
1351 hlist_add_head(&sdp->node, &nl_sdres_list);
1356 mutex_unlock(&local->sdreq_lock);
1360 pr_err("Invalid SNL tlv value 0x%x\n", type);
1364 offset += length + 2;
1369 if (!hlist_empty(&nl_sdres_list))
1370 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1372 if (!hlist_empty(&llc_sdres_list))
1373 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1376 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1380 struct sk_buff *new_skb;
1382 if (skb->len <= LLCP_HEADER_SIZE) {
1383 pr_err("Malformed AGF PDU\n");
1387 skb_pull(skb, LLCP_HEADER_SIZE);
1389 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1390 pdu_len = skb->data[0] << 8 | skb->data[1];
1392 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1394 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1395 pr_err("Malformed AGF PDU\n");
1399 ptype = nfc_llcp_ptype(skb);
1401 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1404 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1405 if (new_skb == NULL) {
1406 pr_err("Could not allocate PDU\n");
1410 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1412 nfc_llcp_rx_skb(local, new_skb);
1416 skb_pull(skb, pdu_len);
1420 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1422 u8 dsap, ssap, ptype;
1424 ptype = nfc_llcp_ptype(skb);
1425 dsap = nfc_llcp_dsap(skb);
1426 ssap = nfc_llcp_ssap(skb);
1428 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1430 if (ptype != LLCP_PDU_SYMM)
1431 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1432 16, 1, skb->data, skb->len, true);
1441 nfc_llcp_recv_ui(local, skb);
1444 case LLCP_PDU_CONNECT:
1445 pr_debug("CONNECT\n");
1446 nfc_llcp_recv_connect(local, skb);
1451 nfc_llcp_recv_disc(local, skb);
1456 nfc_llcp_recv_cc(local, skb);
1461 nfc_llcp_recv_dm(local, skb);
1466 nfc_llcp_recv_snl(local, skb);
1472 pr_debug("I frame\n");
1473 nfc_llcp_recv_hdlc(local, skb);
1477 pr_debug("AGF frame\n");
1478 nfc_llcp_recv_agf(local, skb);
1483 static void nfc_llcp_rx_work(struct work_struct *work)
1485 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1487 struct sk_buff *skb;
1489 skb = local->rx_pending;
1491 pr_debug("No pending SKB\n");
1495 __net_timestamp(skb);
1497 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1499 nfc_llcp_rx_skb(local, skb);
1501 schedule_work(&local->tx_work);
1502 kfree_skb(local->rx_pending);
1503 local->rx_pending = NULL;
1506 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1508 local->rx_pending = skb;
1509 del_timer(&local->link_timer);
1510 schedule_work(&local->rx_work);
1513 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1515 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1517 pr_debug("Received an LLCP PDU\n");
1519 pr_err("err %d\n", err);
1523 __nfc_llcp_recv(local, skb);
1526 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1528 struct nfc_llcp_local *local;
1530 local = nfc_llcp_find_local(dev);
1531 if (local == NULL) {
1536 __nfc_llcp_recv(local, skb);
1541 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1543 struct nfc_llcp_local *local;
1545 local = nfc_llcp_find_local(dev);
1549 local->remote_miu = LLCP_DEFAULT_MIU;
1550 local->remote_lto = LLCP_DEFAULT_LTO;
1552 /* Close and purge all existing sockets */
1553 nfc_llcp_socket_release(local, true, 0);
1556 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1557 u8 comm_mode, u8 rf_mode)
1559 struct nfc_llcp_local *local;
1561 pr_debug("rf mode %d\n", rf_mode);
1563 local = nfc_llcp_find_local(dev);
1567 local->target_idx = target_idx;
1568 local->comm_mode = comm_mode;
1569 local->rf_mode = rf_mode;
1571 if (rf_mode == NFC_RF_INITIATOR) {
1572 pr_debug("Queueing Tx work\n");
1574 schedule_work(&local->tx_work);
1576 mod_timer(&local->link_timer,
1577 jiffies + msecs_to_jiffies(local->remote_lto));
1581 int nfc_llcp_register_device(struct nfc_dev *ndev)
1583 struct nfc_llcp_local *local;
1585 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1590 INIT_LIST_HEAD(&local->list);
1591 kref_init(&local->ref);
1592 mutex_init(&local->sdp_lock);
1593 init_timer(&local->link_timer);
1594 local->link_timer.data = (unsigned long) local;
1595 local->link_timer.function = nfc_llcp_symm_timer;
1597 skb_queue_head_init(&local->tx_queue);
1598 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1600 local->rx_pending = NULL;
1601 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1603 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1605 rwlock_init(&local->sockets.lock);
1606 rwlock_init(&local->connecting_sockets.lock);
1607 rwlock_init(&local->raw_sockets.lock);
1609 local->lto = 150; /* 1500 ms */
1610 local->rw = LLCP_MAX_RW;
1611 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1612 local->local_wks = 0x1; /* LLC Link Management */
1614 nfc_llcp_build_gb(local);
1616 local->remote_miu = LLCP_DEFAULT_MIU;
1617 local->remote_lto = LLCP_DEFAULT_LTO;
1619 mutex_init(&local->sdreq_lock);
1620 INIT_HLIST_HEAD(&local->pending_sdreqs);
1621 init_timer(&local->sdreq_timer);
1622 local->sdreq_timer.data = (unsigned long) local;
1623 local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1624 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1626 list_add(&local->list, &llcp_devices);
1631 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1633 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1635 if (local == NULL) {
1636 pr_debug("No such device\n");
1640 local_cleanup(local);
1642 nfc_llcp_local_put(local);
1645 int __init nfc_llcp_init(void)
1647 return nfc_llcp_sock_init();
1650 void nfc_llcp_exit(void)
1652 nfc_llcp_sock_exit();