2 * Copyright (C) 2011 Intel Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/list.h>
25 #include <linux/nfc.h>
30 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
32 static struct list_head llcp_devices;
34 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
37 sk_add_node(sk, &l->head);
38 write_unlock(&l->lock);
41 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
45 write_unlock(&l->lock);
48 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
50 struct nfc_llcp_local *local = sock->local;
51 struct sk_buff *s, *tmp;
53 pr_debug("%p\n", &sock->sk);
55 skb_queue_purge(&sock->tx_queue);
56 skb_queue_purge(&sock->tx_pending_queue);
61 /* Search for local pending SKBs that are related to this socket */
62 skb_queue_walk_safe(&local->tx_queue, s, tmp) {
63 if (s->sk != &sock->sk)
66 skb_unlink(s, &local->tx_queue);
71 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen,
75 struct hlist_node *tmp;
76 struct nfc_llcp_sock *llcp_sock;
78 skb_queue_purge(&local->tx_queue);
80 write_lock(&local->sockets.lock);
82 sk_for_each_safe(sk, tmp, &local->sockets.head) {
83 llcp_sock = nfc_llcp_sock(sk);
87 nfc_llcp_socket_purge(llcp_sock);
89 if (sk->sk_state == LLCP_CONNECTED)
90 nfc_put_device(llcp_sock->dev);
92 if (sk->sk_state == LLCP_LISTEN) {
93 struct nfc_llcp_sock *lsk, *n;
94 struct sock *accept_sk;
96 list_for_each_entry_safe(lsk, n,
97 &llcp_sock->accept_queue,
100 bh_lock_sock(accept_sk);
102 nfc_llcp_accept_unlink(accept_sk);
105 accept_sk->sk_err = err;
106 accept_sk->sk_state = LLCP_CLOSED;
107 accept_sk->sk_state_change(sk);
109 bh_unlock_sock(accept_sk);
111 sock_orphan(accept_sk);
114 if (listen == true) {
121 * If we have a connection less socket bound, we keep it alive
122 * if the device is still present.
124 if (sk->sk_state == LLCP_BOUND && sk->sk_type == SOCK_DGRAM &&
132 sk->sk_state = LLCP_CLOSED;
133 sk->sk_state_change(sk);
139 sk_del_node_init(sk);
142 write_unlock(&local->sockets.lock);
145 * If we want to keep the listening sockets alive,
146 * we don't touch the RAW ones.
151 write_lock(&local->raw_sockets.lock);
153 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
154 llcp_sock = nfc_llcp_sock(sk);
158 nfc_llcp_socket_purge(llcp_sock);
162 sk->sk_state = LLCP_CLOSED;
163 sk->sk_state_change(sk);
169 sk_del_node_init(sk);
172 write_unlock(&local->raw_sockets.lock);
175 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
177 kref_get(&local->ref);
182 static void local_cleanup(struct nfc_llcp_local *local, bool listen)
184 nfc_llcp_socket_release(local, listen, ENXIO);
185 del_timer_sync(&local->link_timer);
186 skb_queue_purge(&local->tx_queue);
187 cancel_work_sync(&local->tx_work);
188 cancel_work_sync(&local->rx_work);
189 cancel_work_sync(&local->timeout_work);
190 kfree_skb(local->rx_pending);
191 del_timer_sync(&local->sdreq_timer);
192 cancel_work_sync(&local->sdreq_timeout_work);
193 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
196 static void local_release(struct kref *ref)
198 struct nfc_llcp_local *local;
200 local = container_of(ref, struct nfc_llcp_local, ref);
202 list_del(&local->list);
203 local_cleanup(local, false);
207 int nfc_llcp_local_put(struct nfc_llcp_local *local)
212 return kref_put(&local->ref, local_release);
215 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
219 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
221 pr_debug("ssap dsap %d %d\n", ssap, dsap);
223 if (ssap == 0 && dsap == 0)
226 read_lock(&local->sockets.lock);
230 sk_for_each(sk, &local->sockets.head) {
231 tmp_sock = nfc_llcp_sock(sk);
233 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
234 llcp_sock = tmp_sock;
239 read_unlock(&local->sockets.lock);
241 if (llcp_sock == NULL)
244 sock_hold(&llcp_sock->sk);
249 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
254 static void nfc_llcp_timeout_work(struct work_struct *work)
256 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
259 nfc_dep_link_down(local->dev);
262 static void nfc_llcp_symm_timer(unsigned long data)
264 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
266 pr_err("SYMM timeout\n");
268 schedule_work(&local->timeout_work);
271 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
274 HLIST_HEAD(nl_sdres_list);
275 struct hlist_node *n;
276 struct nfc_llcp_sdp_tlv *sdp;
277 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
280 mutex_lock(&local->sdreq_lock);
282 time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
284 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
285 if (time_after(sdp->time, time))
288 sdp->sap = LLCP_SDP_UNBOUND;
290 hlist_del(&sdp->node);
292 hlist_add_head(&sdp->node, &nl_sdres_list);
295 if (!hlist_empty(&local->pending_sdreqs))
296 mod_timer(&local->sdreq_timer,
297 jiffies + msecs_to_jiffies(3 * local->remote_lto));
299 mutex_unlock(&local->sdreq_lock);
301 if (!hlist_empty(&nl_sdres_list))
302 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
305 static void nfc_llcp_sdreq_timer(unsigned long data)
307 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
309 schedule_work(&local->sdreq_timeout_work);
312 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
314 struct nfc_llcp_local *local, *n;
316 list_for_each_entry_safe(local, n, &llcp_devices, list)
317 if (local->dev == dev)
320 pr_debug("No device found\n");
325 static char *wks[] = {
333 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
337 pr_debug("%s\n", service_name);
339 if (service_name == NULL)
342 num_wks = ARRAY_SIZE(wks);
344 for (sap = 0; sap < num_wks; sap++) {
345 if (wks[sap] == NULL)
348 if (strncmp(wks[sap], service_name, service_name_len) == 0)
356 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
357 u8 *sn, size_t sn_len)
360 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
362 pr_debug("sn %zd %p\n", sn_len, sn);
364 if (sn == NULL || sn_len == 0)
367 read_lock(&local->sockets.lock);
371 sk_for_each(sk, &local->sockets.head) {
372 tmp_sock = nfc_llcp_sock(sk);
374 pr_debug("llcp sock %p\n", tmp_sock);
376 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
377 tmp_sock->sk.sk_state != LLCP_LISTEN)
380 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
381 tmp_sock->sk.sk_state != LLCP_BOUND)
384 if (tmp_sock->service_name == NULL ||
385 tmp_sock->service_name_len == 0)
388 if (tmp_sock->service_name_len != sn_len)
391 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
392 llcp_sock = tmp_sock;
397 read_unlock(&local->sockets.lock);
399 pr_debug("Found llcp sock %p\n", llcp_sock);
404 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
405 struct nfc_llcp_sock *sock)
407 mutex_lock(&local->sdp_lock);
409 if (sock->service_name != NULL && sock->service_name_len > 0) {
410 int ssap = nfc_llcp_wks_sap(sock->service_name,
411 sock->service_name_len);
414 pr_debug("WKS %d\n", ssap);
416 /* This is a WKS, let's check if it's free */
417 if (local->local_wks & BIT(ssap)) {
418 mutex_unlock(&local->sdp_lock);
423 set_bit(ssap, &local->local_wks);
424 mutex_unlock(&local->sdp_lock);
430 * Check if there already is a non WKS socket bound
431 * to this service name.
433 if (nfc_llcp_sock_from_sn(local, sock->service_name,
434 sock->service_name_len) != NULL) {
435 mutex_unlock(&local->sdp_lock);
440 mutex_unlock(&local->sdp_lock);
442 return LLCP_SDP_UNBOUND;
444 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
445 if (!test_bit(sock->ssap, &local->local_wks)) {
446 set_bit(sock->ssap, &local->local_wks);
447 mutex_unlock(&local->sdp_lock);
453 mutex_unlock(&local->sdp_lock);
458 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
462 mutex_lock(&local->sdp_lock);
464 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
465 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
466 mutex_unlock(&local->sdp_lock);
470 set_bit(local_ssap, &local->local_sap);
472 mutex_unlock(&local->sdp_lock);
474 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
477 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
482 if (ssap < LLCP_WKS_NUM_SAP) {
484 sdp = &local->local_wks;
485 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
486 atomic_t *client_cnt;
488 local_ssap = ssap - LLCP_WKS_NUM_SAP;
489 sdp = &local->local_sdp;
490 client_cnt = &local->local_sdp_cnt[local_ssap];
492 pr_debug("%d clients\n", atomic_read(client_cnt));
494 mutex_lock(&local->sdp_lock);
496 if (atomic_dec_and_test(client_cnt)) {
497 struct nfc_llcp_sock *l_sock;
499 pr_debug("No more clients for SAP %d\n", ssap);
501 clear_bit(local_ssap, sdp);
503 /* Find the listening sock and set it back to UNBOUND */
504 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
506 l_sock->ssap = LLCP_SDP_UNBOUND;
507 nfc_llcp_sock_put(l_sock);
511 mutex_unlock(&local->sdp_lock);
514 } else if (ssap < LLCP_MAX_SAP) {
515 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
516 sdp = &local->local_sap;
521 mutex_lock(&local->sdp_lock);
523 clear_bit(local_ssap, sdp);
525 mutex_unlock(&local->sdp_lock);
528 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
532 mutex_lock(&local->sdp_lock);
534 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
535 if (ssap == LLCP_SDP_NUM_SAP) {
536 mutex_unlock(&local->sdp_lock);
541 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
543 set_bit(ssap, &local->local_sdp);
545 mutex_unlock(&local->sdp_lock);
547 return LLCP_WKS_NUM_SAP + ssap;
550 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
552 u8 *gb_cur, *version_tlv, version, version_length;
553 u8 *lto_tlv, lto_length;
554 u8 *wks_tlv, wks_length;
555 u8 *miux_tlv, miux_length;
559 version = LLCP_VERSION_11;
560 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
562 gb_len += version_length;
564 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length);
565 gb_len += lto_length;
567 pr_debug("Local wks 0x%lx\n", local->local_wks);
568 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
570 gb_len += wks_length;
572 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
574 gb_len += miux_length;
576 gb_len += ARRAY_SIZE(llcp_magic);
578 if (gb_len > NFC_MAX_GT_LEN) {
585 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
586 gb_cur += ARRAY_SIZE(llcp_magic);
588 memcpy(gb_cur, version_tlv, version_length);
589 gb_cur += version_length;
591 memcpy(gb_cur, lto_tlv, lto_length);
592 gb_cur += lto_length;
594 memcpy(gb_cur, wks_tlv, wks_length);
595 gb_cur += wks_length;
597 memcpy(gb_cur, miux_tlv, miux_length);
598 gb_cur += miux_length;
600 local->gb_len = gb_len;
611 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
613 struct nfc_llcp_local *local;
615 local = nfc_llcp_find_local(dev);
617 *general_bytes_len = 0;
621 nfc_llcp_build_gb(local);
623 *general_bytes_len = local->gb_len;
628 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
630 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
633 pr_err("No LLCP device\n");
639 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
640 memcpy(local->remote_gb, gb, gb_len);
641 local->remote_gb_len = gb_len;
643 if (memcmp(local->remote_gb, llcp_magic, 3)) {
644 pr_err("MAC does not support LLCP\n");
648 return nfc_llcp_parse_gb_tlv(local,
649 &local->remote_gb[3],
650 local->remote_gb_len - 3);
653 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
655 return (pdu->data[0] & 0xfc) >> 2;
658 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
660 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
663 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
665 return pdu->data[1] & 0x3f;
668 static u8 nfc_llcp_ns(struct sk_buff *pdu)
670 return pdu->data[2] >> 4;
673 static u8 nfc_llcp_nr(struct sk_buff *pdu)
675 return pdu->data[2] & 0xf;
678 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
680 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
681 sock->send_n = (sock->send_n + 1) % 16;
682 sock->recv_ack_n = (sock->recv_n - 1) % 16;
685 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
686 struct sk_buff *skb, u8 direction)
688 struct sk_buff *skb_copy = NULL, *nskb;
692 read_lock(&local->raw_sockets.lock);
694 sk_for_each(sk, &local->raw_sockets.head) {
695 if (sk->sk_state != LLCP_BOUND)
698 if (skb_copy == NULL) {
699 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
702 if (skb_copy == NULL)
705 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
707 data[0] = local->dev ? local->dev->idx : 0xFF;
711 nskb = skb_clone(skb_copy, GFP_ATOMIC);
715 if (sock_queue_rcv_skb(sk, nskb))
719 read_unlock(&local->raw_sockets.lock);
724 static void nfc_llcp_tx_work(struct work_struct *work)
726 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
730 struct nfc_llcp_sock *llcp_sock;
732 skb = skb_dequeue(&local->tx_queue);
735 llcp_sock = nfc_llcp_sock(sk);
737 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
738 nfc_llcp_send_symm(local->dev);
740 struct sk_buff *copy_skb = NULL;
741 u8 ptype = nfc_llcp_ptype(skb);
744 pr_debug("Sending pending skb\n");
745 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
746 DUMP_PREFIX_OFFSET, 16, 1,
747 skb->data, skb->len, true);
749 if (ptype == LLCP_PDU_I)
750 copy_skb = skb_copy(skb, GFP_ATOMIC);
752 __net_timestamp(skb);
754 nfc_llcp_send_to_raw_sock(local, skb,
755 NFC_LLCP_DIRECTION_TX);
757 ret = nfc_data_exchange(local->dev, local->target_idx,
758 skb, nfc_llcp_recv, local);
765 if (ptype == LLCP_PDU_I && copy_skb)
766 skb_queue_tail(&llcp_sock->tx_pending_queue,
770 nfc_llcp_send_symm(local->dev);
774 mod_timer(&local->link_timer,
775 jiffies + msecs_to_jiffies(2 * local->remote_lto));
778 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
782 struct nfc_llcp_sock *llcp_sock;
784 read_lock(&local->connecting_sockets.lock);
786 sk_for_each(sk, &local->connecting_sockets.head) {
787 llcp_sock = nfc_llcp_sock(sk);
789 if (llcp_sock->ssap == ssap) {
790 sock_hold(&llcp_sock->sk);
798 read_unlock(&local->connecting_sockets.lock);
803 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
804 u8 *sn, size_t sn_len)
806 struct nfc_llcp_sock *llcp_sock;
808 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
810 if (llcp_sock == NULL)
813 sock_hold(&llcp_sock->sk);
818 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
820 u8 *tlv = &skb->data[2], type, length;
821 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
823 while (offset < tlv_array_len) {
827 pr_debug("type 0x%x length %d\n", type, length);
829 if (type == LLCP_TLV_SN) {
834 offset += length + 2;
841 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
844 struct nfc_llcp_sock *llcp_sock;
845 struct nfc_llcp_ui_cb *ui_cb;
848 dsap = nfc_llcp_dsap(skb);
849 ssap = nfc_llcp_ssap(skb);
851 ui_cb = nfc_llcp_ui_skb_cb(skb);
855 pr_debug("%d %d\n", dsap, ssap);
857 /* We're looking for a bound socket, not a client one */
858 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
859 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
862 /* There is no sequence with UI frames */
863 skb_pull(skb, LLCP_HEADER_SIZE);
864 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
866 * UI frames will be freed from the socket layer, so we
867 * need to keep them alive until someone receives them.
871 pr_err("Receive queue is full\n");
875 nfc_llcp_sock_put(llcp_sock);
878 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
881 struct sock *new_sk, *parent;
882 struct nfc_llcp_sock *sock, *new_sock;
883 u8 dsap, ssap, reason;
885 dsap = nfc_llcp_dsap(skb);
886 ssap = nfc_llcp_ssap(skb);
888 pr_debug("%d %d\n", dsap, ssap);
890 if (dsap != LLCP_SAP_SDP) {
891 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
892 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
893 reason = LLCP_DM_NOBOUND;
900 sn = nfc_llcp_connect_sn(skb, &sn_len);
902 reason = LLCP_DM_NOBOUND;
906 pr_debug("Service name length %zu\n", sn_len);
908 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
910 reason = LLCP_DM_NOBOUND;
915 lock_sock(&sock->sk);
919 if (sk_acceptq_is_full(parent)) {
920 reason = LLCP_DM_REJ;
921 release_sock(&sock->sk);
926 if (sock->ssap == LLCP_SDP_UNBOUND) {
927 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
929 pr_debug("First client, reserving %d\n", ssap);
931 if (ssap == LLCP_SAP_MAX) {
932 reason = LLCP_DM_REJ;
933 release_sock(&sock->sk);
941 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
942 if (new_sk == NULL) {
943 reason = LLCP_DM_REJ;
944 release_sock(&sock->sk);
949 new_sock = nfc_llcp_sock(new_sk);
950 new_sock->dev = local->dev;
951 new_sock->local = nfc_llcp_local_get(local);
952 new_sock->rw = sock->rw;
953 new_sock->miux = sock->miux;
954 new_sock->remote_miu = local->remote_miu;
955 new_sock->nfc_protocol = sock->nfc_protocol;
956 new_sock->dsap = ssap;
957 new_sock->target_idx = local->target_idx;
958 new_sock->parent = parent;
959 new_sock->ssap = sock->ssap;
960 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
961 atomic_t *client_count;
963 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
966 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
968 atomic_inc(client_count);
969 new_sock->reserved_ssap = sock->ssap;
972 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
973 skb->len - LLCP_HEADER_SIZE);
975 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
977 nfc_llcp_sock_link(&local->sockets, new_sk);
979 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
981 nfc_get_device(local->dev->idx);
983 new_sk->sk_state = LLCP_CONNECTED;
985 /* Wake the listening processes */
986 parent->sk_data_ready(parent, 0);
989 nfc_llcp_send_cc(new_sock);
991 release_sock(&sock->sk);
998 nfc_llcp_send_dm(local, dsap, ssap, reason);
1001 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
1004 struct nfc_llcp_local *local = sock->local;
1006 pr_debug("Remote ready %d tx queue len %d remote rw %d",
1007 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1010 /* Try to queue some I frames for transmission */
1011 while (sock->remote_ready &&
1012 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1013 struct sk_buff *pdu;
1015 pdu = skb_dequeue(&sock->tx_queue);
1019 /* Update N(S)/N(R) */
1020 nfc_llcp_set_nrns(sock, pdu);
1022 skb_queue_tail(&local->tx_queue, pdu);
1029 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1030 struct sk_buff *skb)
1032 struct nfc_llcp_sock *llcp_sock;
1034 u8 dsap, ssap, ptype, ns, nr;
1036 ptype = nfc_llcp_ptype(skb);
1037 dsap = nfc_llcp_dsap(skb);
1038 ssap = nfc_llcp_ssap(skb);
1039 ns = nfc_llcp_ns(skb);
1040 nr = nfc_llcp_nr(skb);
1042 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1044 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1045 if (llcp_sock == NULL) {
1046 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1050 sk = &llcp_sock->sk;
1052 if (sk->sk_state == LLCP_CLOSED) {
1054 nfc_llcp_sock_put(llcp_sock);
1057 /* Pass the payload upstream */
1058 if (ptype == LLCP_PDU_I) {
1059 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1061 if (ns == llcp_sock->recv_n)
1062 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1064 pr_err("Received out of sequence I PDU\n");
1066 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1067 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1069 * I frames will be freed from the socket layer, so we
1070 * need to keep them alive until someone receives them.
1074 pr_err("Receive queue is full\n");
1079 /* Remove skbs from the pending queue */
1080 if (llcp_sock->send_ack_n != nr) {
1081 struct sk_buff *s, *tmp;
1084 llcp_sock->send_ack_n = nr;
1086 /* Remove and free all skbs until ns == nr */
1087 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1090 skb_unlink(s, &llcp_sock->tx_pending_queue);
1097 /* Re-queue the remaining skbs for transmission */
1098 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1100 skb_unlink(s, &llcp_sock->tx_pending_queue);
1101 skb_queue_head(&local->tx_queue, s);
1105 if (ptype == LLCP_PDU_RR)
1106 llcp_sock->remote_ready = true;
1107 else if (ptype == LLCP_PDU_RNR)
1108 llcp_sock->remote_ready = false;
1110 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1111 nfc_llcp_send_rr(llcp_sock);
1114 nfc_llcp_sock_put(llcp_sock);
1117 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1118 struct sk_buff *skb)
1120 struct nfc_llcp_sock *llcp_sock;
1124 dsap = nfc_llcp_dsap(skb);
1125 ssap = nfc_llcp_ssap(skb);
1127 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1128 if (llcp_sock == NULL) {
1129 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1133 sk = &llcp_sock->sk;
1136 nfc_llcp_socket_purge(llcp_sock);
1138 if (sk->sk_state == LLCP_CLOSED) {
1140 nfc_llcp_sock_put(llcp_sock);
1143 if (sk->sk_state == LLCP_CONNECTED) {
1144 nfc_put_device(local->dev);
1145 sk->sk_state = LLCP_CLOSED;
1146 sk->sk_state_change(sk);
1149 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1152 nfc_llcp_sock_put(llcp_sock);
1155 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1157 struct nfc_llcp_sock *llcp_sock;
1161 dsap = nfc_llcp_dsap(skb);
1162 ssap = nfc_llcp_ssap(skb);
1164 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1165 if (llcp_sock == NULL) {
1166 pr_err("Invalid CC\n");
1167 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1172 sk = &llcp_sock->sk;
1174 /* Unlink from connecting and link to the client array */
1175 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1176 nfc_llcp_sock_link(&local->sockets, sk);
1177 llcp_sock->dsap = ssap;
1179 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1180 skb->len - LLCP_HEADER_SIZE);
1182 sk->sk_state = LLCP_CONNECTED;
1183 sk->sk_state_change(sk);
1185 nfc_llcp_sock_put(llcp_sock);
1188 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1190 struct nfc_llcp_sock *llcp_sock;
1192 u8 dsap, ssap, reason;
1194 dsap = nfc_llcp_dsap(skb);
1195 ssap = nfc_llcp_ssap(skb);
1196 reason = skb->data[2];
1198 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1201 case LLCP_DM_NOBOUND:
1203 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1207 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1211 if (llcp_sock == NULL) {
1212 pr_debug("Already closed\n");
1216 sk = &llcp_sock->sk;
1219 sk->sk_state = LLCP_CLOSED;
1220 sk->sk_state_change(sk);
1222 nfc_llcp_sock_put(llcp_sock);
1225 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1226 struct sk_buff *skb)
1228 struct nfc_llcp_sock *llcp_sock;
1229 u8 dsap, ssap, *tlv, type, length, tid, sap;
1230 u16 tlv_len, offset;
1232 size_t service_name_len;
1233 struct nfc_llcp_sdp_tlv *sdp;
1234 HLIST_HEAD(llc_sdres_list);
1235 size_t sdres_tlvs_len;
1236 HLIST_HEAD(nl_sdres_list);
1238 dsap = nfc_llcp_dsap(skb);
1239 ssap = nfc_llcp_ssap(skb);
1241 pr_debug("%d %d\n", dsap, ssap);
1243 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1244 pr_err("Wrong SNL SAP\n");
1248 tlv = &skb->data[LLCP_HEADER_SIZE];
1249 tlv_len = skb->len - LLCP_HEADER_SIZE;
1253 while (offset < tlv_len) {
1258 case LLCP_TLV_SDREQ:
1260 service_name = (char *) &tlv[3];
1261 service_name_len = length - 1;
1263 pr_debug("Looking for %.16s\n", service_name);
1265 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1266 !strncmp(service_name, "urn:nfc:sn:sdp",
1267 service_name_len)) {
1272 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1280 * We found a socket but its ssap has not been reserved
1281 * yet. We need to assign it for good and send a reply.
1282 * The ssap will be freed when the socket is closed.
1284 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1285 atomic_t *client_count;
1287 sap = nfc_llcp_reserve_sdp_ssap(local);
1289 pr_debug("Reserving %d\n", sap);
1291 if (sap == LLCP_SAP_MAX) {
1297 &local->local_sdp_cnt[sap -
1300 atomic_inc(client_count);
1302 llcp_sock->ssap = sap;
1303 llcp_sock->reserved_ssap = sap;
1305 sap = llcp_sock->ssap;
1308 pr_debug("%p %d\n", llcp_sock, sap);
1311 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1315 sdres_tlvs_len += sdp->tlv_len;
1316 hlist_add_head(&sdp->node, &llc_sdres_list);
1319 case LLCP_TLV_SDRES:
1320 mutex_lock(&local->sdreq_lock);
1322 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1324 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1325 if (sdp->tid != tlv[2])
1330 pr_debug("Found: uri=%s, sap=%d\n",
1331 sdp->uri, sdp->sap);
1333 hlist_del(&sdp->node);
1335 hlist_add_head(&sdp->node, &nl_sdres_list);
1340 mutex_unlock(&local->sdreq_lock);
1344 pr_err("Invalid SNL tlv value 0x%x\n", type);
1348 offset += length + 2;
1353 if (!hlist_empty(&nl_sdres_list))
1354 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1356 if (!hlist_empty(&llc_sdres_list))
1357 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1360 static void nfc_llcp_rx_work(struct work_struct *work)
1362 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1364 u8 dsap, ssap, ptype;
1365 struct sk_buff *skb;
1367 skb = local->rx_pending;
1369 pr_debug("No pending SKB\n");
1373 ptype = nfc_llcp_ptype(skb);
1374 dsap = nfc_llcp_dsap(skb);
1375 ssap = nfc_llcp_ssap(skb);
1377 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1379 if (ptype != LLCP_PDU_SYMM)
1380 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1381 16, 1, skb->data, skb->len, true);
1383 __net_timestamp(skb);
1385 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1394 nfc_llcp_recv_ui(local, skb);
1397 case LLCP_PDU_CONNECT:
1398 pr_debug("CONNECT\n");
1399 nfc_llcp_recv_connect(local, skb);
1404 nfc_llcp_recv_disc(local, skb);
1409 nfc_llcp_recv_cc(local, skb);
1414 nfc_llcp_recv_dm(local, skb);
1419 nfc_llcp_recv_snl(local, skb);
1425 pr_debug("I frame\n");
1426 nfc_llcp_recv_hdlc(local, skb);
1431 schedule_work(&local->tx_work);
1432 kfree_skb(local->rx_pending);
1433 local->rx_pending = NULL;
1436 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1438 local->rx_pending = skb;
1439 del_timer(&local->link_timer);
1440 schedule_work(&local->rx_work);
1443 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1445 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1447 pr_debug("Received an LLCP PDU\n");
1449 pr_err("err %d\n", err);
1453 __nfc_llcp_recv(local, skb);
1456 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1458 struct nfc_llcp_local *local;
1460 local = nfc_llcp_find_local(dev);
1464 __nfc_llcp_recv(local, skb);
1469 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1471 struct nfc_llcp_local *local;
1473 local = nfc_llcp_find_local(dev);
1477 /* Close and purge all existing sockets */
1478 nfc_llcp_socket_release(local, true, 0);
1481 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1482 u8 comm_mode, u8 rf_mode)
1484 struct nfc_llcp_local *local;
1486 pr_debug("rf mode %d\n", rf_mode);
1488 local = nfc_llcp_find_local(dev);
1492 local->target_idx = target_idx;
1493 local->comm_mode = comm_mode;
1494 local->rf_mode = rf_mode;
1496 if (rf_mode == NFC_RF_INITIATOR) {
1497 pr_debug("Queueing Tx work\n");
1499 schedule_work(&local->tx_work);
1501 mod_timer(&local->link_timer,
1502 jiffies + msecs_to_jiffies(local->remote_lto));
1506 int nfc_llcp_register_device(struct nfc_dev *ndev)
1508 struct nfc_llcp_local *local;
1510 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1515 INIT_LIST_HEAD(&local->list);
1516 kref_init(&local->ref);
1517 mutex_init(&local->sdp_lock);
1518 init_timer(&local->link_timer);
1519 local->link_timer.data = (unsigned long) local;
1520 local->link_timer.function = nfc_llcp_symm_timer;
1522 skb_queue_head_init(&local->tx_queue);
1523 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1525 local->rx_pending = NULL;
1526 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1528 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1530 rwlock_init(&local->sockets.lock);
1531 rwlock_init(&local->connecting_sockets.lock);
1532 rwlock_init(&local->raw_sockets.lock);
1534 local->lto = 150; /* 1500 ms */
1535 local->rw = LLCP_MAX_RW;
1536 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1538 nfc_llcp_build_gb(local);
1540 local->remote_miu = LLCP_DEFAULT_MIU;
1541 local->remote_lto = LLCP_DEFAULT_LTO;
1543 mutex_init(&local->sdreq_lock);
1544 INIT_HLIST_HEAD(&local->pending_sdreqs);
1545 init_timer(&local->sdreq_timer);
1546 local->sdreq_timer.data = (unsigned long) local;
1547 local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1548 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1550 list_add(&local->list, &llcp_devices);
1555 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1557 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1559 if (local == NULL) {
1560 pr_debug("No such device\n");
1564 local_cleanup(local, false);
1566 nfc_llcp_local_put(local);
1569 int __init nfc_llcp_init(void)
1571 INIT_LIST_HEAD(&llcp_devices);
1573 return nfc_llcp_sock_init();
1576 void nfc_llcp_exit(void)
1578 nfc_llcp_sock_exit();