[deliverable/linux.git] / net / nfc / llcp / commands.c

/*
 * Copyright (C) 2011  Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 * Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#define pr_fmt(fmt) "llcp: %s: " fmt, __func__

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/nfc.h>

#include <net/nfc/nfc.h>

#include "../nfc.h"
#include "llcp.h"

static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
	0,
	1, /* VERSION */
	2, /* MIUX */
	2, /* WKS */
	1, /* LTO */
	1, /* RW */
	0, /* SN */
	1, /* OPT */
	0, /* SDREQ */
	2, /* SDRES */

};

static u8 llcp_tlv8(u8 *tlv, u8 type)
{
	if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
		return 0;

	return tlv[2];
}

static u8 llcp_tlv16(u8 *tlv, u8 type)
{
	if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
		return 0;

	return be16_to_cpu(*((__be16 *)(tlv + 2)));
}


static u8 llcp_tlv_version(u8 *tlv)
{
	return llcp_tlv8(tlv, LLCP_TLV_VERSION);
}

static u16 llcp_tlv_miux(u8 *tlv)
{
	return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7f;
}

static u16 llcp_tlv_wks(u8 *tlv)
{
	return llcp_tlv16(tlv, LLCP_TLV_WKS);
}

static u16 llcp_tlv_lto(u8 *tlv)
{
	return llcp_tlv8(tlv, LLCP_TLV_LTO);
}

static u8 llcp_tlv_opt(u8 *tlv)
{
	return llcp_tlv8(tlv, LLCP_TLV_OPT);
}

static u8 llcp_tlv_rw(u8 *tlv)
{
	return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
}

u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length)
{
	u8 *tlv, length;

	pr_debug("type %d\n", type);

	if (type >= LLCP_TLV_MAX)
		return NULL;

	length = llcp_tlv_length[type];
	if (length == 0 && value_length == 0)
		return NULL;
	else
		length = value_length;

	*tlv_length = 2 + length;
	tlv = kzalloc(2 + length, GFP_KERNEL);
	if (tlv == NULL)
		return tlv;

	tlv[0] = type;
	tlv[1] = length;
	memcpy(tlv + 2, value, length);

	return tlv;
}

int nfc_llcp_parse_tlv(struct nfc_llcp_local *local,
			u8 *tlv_array, u16 tlv_array_len)
{
	u8 *tlv = tlv_array, type, length, offset = 0;

	pr_debug("TLV array length %d\n", tlv_array_len);

	if (local == NULL)
		return -ENODEV;

	while (offset < tlv_array_len) {
		type = tlv[0];
		length = tlv[1];

		pr_debug("type 0x%x length %d\n", type, length);

		switch (type) {
		case LLCP_TLV_VERSION:
			local->remote_version = llcp_tlv_version(tlv);
			break;
		case LLCP_TLV_MIUX:
			local->remote_miu = llcp_tlv_miux(tlv) + 128;
			break;
		case LLCP_TLV_WKS:
			local->remote_wks = llcp_tlv_wks(tlv);
			break;
		case LLCP_TLV_LTO:
			local->remote_lto = llcp_tlv_lto(tlv) * 10;
			break;
		case LLCP_TLV_OPT:
			local->remote_opt = llcp_tlv_opt(tlv);
			break;
		case LLCP_TLV_RW:
			local->remote_rw = llcp_tlv_rw(tlv);
			break;
		default:
			pr_err("Invalid gt tlv value 0x%x\n", type);
			break;
		}

		offset += length + 2;
		tlv += length + 2;
	}

	pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x rw %d\n",
		local->remote_version, local->remote_miu,
		local->remote_lto, local->remote_opt,
		local->remote_wks, local->remote_rw);

	return 0;
}

static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
					u8 dsap, u8 ssap, u8 ptype)
{
	u8 header[2];

	pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);

	header[0] = (u8)((dsap << 2) | (ptype >> 2));
	header[1] = (u8)((ptype << 6) | ssap);

	pr_debug("header 0x%x 0x%x\n", header[0], header[1]);

	memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE);

	return pdu;
}

static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv, u8 tlv_length)
{
	/* XXX Add an skb length check */

	if (tlv == NULL)
		return NULL;

	memcpy(skb_put(pdu, tlv_length), tlv, tlv_length);

	return pdu;
}

static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock,
							u8 cmd, u16 size)
{
	struct sk_buff *skb;
	int err;

	if (sock->ssap == 0)
		return NULL;

	skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
					size + LLCP_HEADER_SIZE, &err);
	if (skb == NULL) {
		pr_err("Could not allocate PDU\n");
		return NULL;
	}

	skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd);

	return skb;
}

int nfc_llcp_disconnect(struct nfc_llcp_sock *sock)
{
	struct sk_buff *skb;
	struct nfc_dev *dev;
	struct nfc_llcp_local *local;
	u16 size = 0;

	pr_debug("Sending DISC\n");

	local = sock->local;
	if (local == NULL)
		return -ENODEV;

	dev = sock->dev;
	if (dev == NULL)
		return -ENODEV;

	size += LLCP_HEADER_SIZE;
	size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;

	skb = alloc_skb(size, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;

	skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);

	skb = llcp_add_header(skb, sock->ssap, sock->dsap, LLCP_PDU_DISC);

	skb_queue_tail(&local->tx_queue, skb);

	return 0;
}

int nfc_llcp_send_symm(struct nfc_dev *dev)
{
	struct sk_buff *skb;
	struct nfc_llcp_local *local;
	u16 size = 0;

	pr_debug("Sending SYMM\n");

	local = nfc_llcp_find_local(dev);
	if (local == NULL)
		return -ENODEV;

	size += LLCP_HEADER_SIZE;
	size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;

	skb = alloc_skb(size, GFP_KERNEL);
	if (skb == NULL)
		return -ENOMEM;

	skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);

	skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);

	return nfc_data_exchange(dev, local->target_idx, skb,
					nfc_llcp_recv, local);
}

int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
{
	struct nfc_llcp_local *local;
	struct sk_buff *skb;
	u8 *service_name_tlv = NULL, service_name_tlv_length;
	int err;
	u16 size = 0;

	pr_debug("Sending CONNECT\n");

	local = sock->local;
	if (local == NULL)
		return -ENODEV;

	if (sock->service_name != NULL) {
		service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
					sock->service_name,
					sock->service_name_len,
					&service_name_tlv_length);
		size += service_name_tlv_length;
	}

	pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);

	skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
	if (skb == NULL) {
		err = -ENOMEM;
		goto error_tlv;
	}

	if (service_name_tlv != NULL)
		skb = llcp_add_tlv(skb, service_name_tlv,
					service_name_tlv_length);

	skb_queue_tail(&local->tx_queue, skb);

	return 0;

error_tlv:
	pr_err("error %d\n", err);

	kfree(service_name_tlv);

	return err;
}

int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
{
	struct nfc_llcp_local *local;
	struct sk_buff *skb;

	pr_debug("Sending CC\n");

	local = sock->local;
	if (local == NULL)
		return -ENODEV;

	skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, 0);
	if (skb == NULL)
		return -ENOMEM;

	skb_queue_tail(&local->tx_queue, skb);

	return 0;
}

int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
{
	struct sk_buff *skb;
	struct nfc_dev *dev;
	u16 size = 1; /* Reason code */

	pr_debug("Sending DM reason 0x%x\n", reason);

	if (local == NULL)
		return -ENODEV;

	dev = local->dev;
	if (dev == NULL)
		return -ENODEV;

	size += LLCP_HEADER_SIZE;
	size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;

	skb = alloc_skb(size, GFP_KERNEL);
	if (skb == NULL)
		return -ENOMEM;

	skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);

	skb = llcp_add_header(skb, ssap, dsap, LLCP_PDU_DM);

	memcpy(skb_put(skb, 1), &reason, 1);

	skb_queue_head(&local->tx_queue, skb);

	return 0;
}

int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
{
	struct sk_buff *skb;
	struct nfc_llcp_local *local;

	pr_debug("Send DISC\n");

	local = sock->local;
	if (local == NULL)
		return -ENODEV;

	skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
	if (skb == NULL)
		return -ENOMEM;

	skb_queue_head(&local->tx_queue, skb);

	return 0;
}

int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
				struct msghdr *msg, size_t len)
{
	struct sk_buff *pdu;
	struct sock *sk;

	pr_debug("Send I frame\n");

	pdu = llcp_allocate_pdu(sock, LLCP_PDU_I, len + LLCP_SEQUENCE_SIZE);
	if (pdu == NULL)
		return -ENOMEM;

	skb_put(pdu, LLCP_SEQUENCE_SIZE);

	if (memcpy_fromiovec(skb_put(pdu, len), msg->msg_iov, len)) {
		kfree_skb(pdu);
		return -EFAULT;
	}

	skb_queue_head(&sock->tx_queue, pdu);

	sk = &sock->sk;
	lock_sock(sk);

	nfc_llcp_queue_i_frames(sock);

	release_sock(sk);

	return 0;
}

int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
{
	struct sk_buff *skb;
	struct nfc_llcp_local *local;

	pr_debug("Send rr nr %d\n", sock->recv_n);

	local = sock->local;
	if (local == NULL)
		return -ENODEV;

	skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
	if (skb == NULL)
		return -ENOMEM;

	skb_put(skb, LLCP_SEQUENCE_SIZE);

	skb->data[2] = sock->recv_n % 16;

	skb_queue_head(&local->tx_queue, skb);

	return 0;
}
Commit	Line	Data
d646960f SO	1	/*
	2	* Copyright (C) 2011 Intel Corporation. All rights reserved.
	3	*
	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.
	8	*
	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.
	13	*
	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.
	18	*/
	19
	20	#define pr_fmt(fmt) "llcp: %s: " fmt, __func__
	21
	22	#include <linux/init.h>
	23	#include <linux/kernel.h>
	24	#include <linux/module.h>
	25	#include <linux/nfc.h>
	26
	27	#include <net/nfc/nfc.h>
	28
	29	#include "../nfc.h"
	30	#include "llcp.h"
	31
	32	static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
	33	0,
	34	1, /* VERSION */
	35	2, /* MIUX */
	36	2, /* WKS */
	37	1, /* LTO */
	38	1, /* RW */
	39	0, /* SN */
	40	1, /* OPT */
	41	0, /* SDREQ */
	42	2, /* SDRES */
	43
	44	};
	45
	46	static u8 llcp_tlv8(u8 *tlv, u8 type)
	47	{
	48	if (tlv[0] != type \|\| tlv[1] != llcp_tlv_length[tlv[0]])
	49	return 0;
	50
	51	return tlv[2];
	52	}
	53
	54	static u8 llcp_tlv16(u8 *tlv, u8 type)
	55	{
	56	if (tlv[0] != type \|\| tlv[1] != llcp_tlv_length[tlv[0]])
	57	return 0;
	58
	59	return be16_to_cpu(((__be16 )(tlv + 2)));
	60	}
	61
	62
	63	static u8 llcp_tlv_version(u8 *tlv)
	64	{
65	return llcp_tlv8(tlv, LLCP_TLV_VERSION);
66	}
67
68	static u16 llcp_tlv_miux(u8 *tlv)
69	{
70	return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7f;
71	}
72
73	static u16 llcp_tlv_wks(u8 *tlv)
74	{
75	return llcp_tlv16(tlv, LLCP_TLV_WKS);
76	}
77
78	static u16 llcp_tlv_lto(u8 *tlv)
79	{
80	return llcp_tlv8(tlv, LLCP_TLV_LTO);
81	}
82
83	static u8 llcp_tlv_opt(u8 *tlv)
84	{
85	return llcp_tlv8(tlv, LLCP_TLV_OPT);
86	}
87
88	static u8 llcp_tlv_rw(u8 *tlv)
89	{
90	return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
91	}
92
93	u8 nfc_llcp_build_tlv(u8 type, u8 value, u8 value_length, u8 *tlv_length)
94	{
95	u8 *tlv, length;
96
97	pr_debug("type %d\n", type);
98
99	if (type >= LLCP_TLV_MAX)
100	return NULL;
101
102	length = llcp_tlv_length[type];
103	if (length == 0 && value_length == 0)
104	return NULL;
105	else
106	length = value_length;
107
108	*tlv_length = 2 + length;
109	tlv = kzalloc(2 + length, GFP_KERNEL);
110	if (tlv == NULL)
111	return tlv;
112
113	tlv[0] = type;
114	tlv[1] = length;
115	memcpy(tlv + 2, value, length);
116
117	return tlv;
118	}
119
120	int nfc_llcp_parse_tlv(struct nfc_llcp_local *local,
121	u8 *tlv_array, u16 tlv_array_len)
122	{
123	u8 *tlv = tlv_array, type, length, offset = 0;
124
125	pr_debug("TLV array length %d\n", tlv_array_len);
126
127	if (local == NULL)
128	return -ENODEV;
129
130	while (offset < tlv_array_len) {
131	type = tlv[0];
132	length = tlv[1];
133
134	pr_debug("type 0x%x length %d\n", type, length);
135
136	switch (type) {
137	case LLCP_TLV_VERSION:
138	local->remote_version = llcp_tlv_version(tlv);
139	break;
140	case LLCP_TLV_MIUX:
141	local->remote_miu = llcp_tlv_miux(tlv) + 128;
142	break;
143	case LLCP_TLV_WKS:
144	local->remote_wks = llcp_tlv_wks(tlv);
145	break;
146	case LLCP_TLV_LTO:
147	local->remote_lto = llcp_tlv_lto(tlv) * 10;
148	break;
149	case LLCP_TLV_OPT:
150	local->remote_opt = llcp_tlv_opt(tlv);
151	break;
152	case LLCP_TLV_RW:
153	local->remote_rw = llcp_tlv_rw(tlv);
154	break;
155	default:
156	pr_err("Invalid gt tlv value 0x%x\n", type);
157	break;
158	}
159
160	offset += length + 2;
161	tlv += length + 2;
162	}
163
164	pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x rw %d\n",
165	local->remote_version, local->remote_miu,
166	local->remote_lto, local->remote_opt,
167	local->remote_wks, local->remote_rw);
168
169	return 0;
170	}
171
172	static struct sk_buff llcp_add_header(struct sk_buff pdu,
173	u8 dsap, u8 ssap, u8 ptype)
174	{
175	u8 header[2];
176
177	pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
178
179	header[0] = (u8)((dsap << 2) \| (ptype >> 2));
180	header[1] = (u8)((ptype << 6) \| ssap);
181
182	pr_debug("header 0x%x 0x%x\n", header[0], header[1]);
183
184	memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE);
185
186	return pdu;
187	}
188
189	static struct sk_buff llcp_add_tlv(struct sk_buff pdu, u8 *tlv, u8 tlv_length)
190	{
191	/* XXX Add an skb length check */
192
193	if (tlv == NULL)
194	return NULL;
195
196	memcpy(skb_put(pdu, tlv_length), tlv, tlv_length);
197
198	return pdu;
199	}
200
201	static struct sk_buff llcp_allocate_pdu(struct nfc_llcp_sock sock,
202	u8 cmd, u16 size)
203	{
204	struct sk_buff *skb;
205	int err;
206
207	if (sock->ssap == 0)
208	return NULL;
209
210	skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
211	size + LLCP_HEADER_SIZE, &err);
212	if (skb == NULL) {
213	pr_err("Could not allocate PDU\n");
214	return NULL;
215	}
216
217	skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd);
218
219	return skb;
220	}
221
222	int nfc_llcp_disconnect(struct nfc_llcp_sock *sock)
223	{
224	struct sk_buff *skb;
225	struct nfc_dev *dev;
226	struct nfc_llcp_local *local;
227	u16 size = 0;
228
229	pr_debug("Sending DISC\n");
230
231	local = sock->local;
232	if (local == NULL)
233	return -ENODEV;
234
235	dev = sock->dev;
236	if (dev == NULL)
237	return -ENODEV;
238
239	size += LLCP_HEADER_SIZE;
240	size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
241
242	skb = alloc_skb(size, GFP_ATOMIC);
243	if (skb == NULL)
244	return -ENOMEM;
245
246	skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
247
248	skb = llcp_add_header(skb, sock->ssap, sock->dsap, LLCP_PDU_DISC);
249
250	skb_queue_tail(&local->tx_queue, skb);
251
252	return 0;
253	}
254
255	int nfc_llcp_send_symm(struct nfc_dev *dev)
256	{
257	struct sk_buff *skb;
258	struct nfc_llcp_local *local;
259	u16 size = 0;
260
261	pr_debug("Sending SYMM\n");
262
263	local = nfc_llcp_find_local(dev);
264	if (local == NULL)
265	return -ENODEV;
266
267	size += LLCP_HEADER_SIZE;
268	size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
269
270	skb = alloc_skb(size, GFP_KERNEL);
271	if (skb == NULL)
272	return -ENOMEM;
273
274	skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
275
276	skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
277
278	return nfc_data_exchange(dev, local->target_idx, skb,
279	nfc_llcp_recv, local);
280	}
281
282	int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
283	{
284	struct nfc_llcp_local *local;
285	struct sk_buff *skb;
286	u8 *service_name_tlv = NULL, service_name_tlv_length;
287	int err;
288	u16 size = 0;
289
290	pr_debug("Sending CONNECT\n");
291
292	local = sock->local;
293	if (local == NULL)
294	return -ENODEV;
295
296	if (sock->service_name != NULL) {
297	service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
298	sock->service_name,
299	sock->service_name_len,
300	&service_name_tlv_length);
301	size += service_name_tlv_length;
302	}
303
304	pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
305
306	skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
307	if (skb == NULL) {
308	err = -ENOMEM;
309	goto error_tlv;
310	}
311
312	if (service_name_tlv != NULL)
313	skb = llcp_add_tlv(skb, service_name_tlv,
314	service_name_tlv_length);
315
316	skb_queue_tail(&local->tx_queue, skb);
317
318	return 0;
319
320	error_tlv:
321	pr_err("error %d\n", err);
322
323	kfree(service_name_tlv);
324
325	return err;
326	}
327
328	int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
329	{
330	struct nfc_llcp_local *local;
331	struct sk_buff *skb;
332
333	pr_debug("Sending CC\n");
334
335	local = sock->local;
336	if (local == NULL)
337	return -ENODEV;
338
339	skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, 0);
340	if (skb == NULL)
341	return -ENOMEM;
342
343	skb_queue_tail(&local->tx_queue, skb);
344
345	return 0;
346	}
347
348	int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
349	{
350	struct sk_buff *skb;
351	struct nfc_dev *dev;
352	u16 size = 1; /* Reason code */
353
354	pr_debug("Sending DM reason 0x%x\n", reason);
355
356	if (local == NULL)
357	return -ENODEV;
358
359	dev = local->dev;
360	if (dev == NULL)
361	return -ENODEV;
362
363	size += LLCP_HEADER_SIZE;
364	size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
365
366	skb = alloc_skb(size, GFP_KERNEL);
367	if (skb == NULL)
368	return -ENOMEM;
369
370	skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
371
372	skb = llcp_add_header(skb, ssap, dsap, LLCP_PDU_DM);
373
374	memcpy(skb_put(skb, 1), &reason, 1);
375
376	skb_queue_head(&local->tx_queue, skb);
377
378	return 0;
379	}
380
381	int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
382	{
383	struct sk_buff *skb;
384	struct nfc_llcp_local *local;
385
386	pr_debug("Send DISC\n");
387
388	local = sock->local;
389	if (local == NULL)
390	return -ENODEV;
391
392	skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
393	if (skb == NULL)
394	return -ENOMEM;
395
396	skb_queue_head(&local->tx_queue, skb);
397
398	return 0;
399	}
53a0ac2e SO	400
	401	int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
	402	struct msghdr *msg, size_t len)
	403	{
	404	struct sk_buff *pdu;
	405	struct sock *sk;
	406
	407	pr_debug("Send I frame\n");
	408
	409	pdu = llcp_allocate_pdu(sock, LLCP_PDU_I, len + LLCP_SEQUENCE_SIZE);
	410	if (pdu == NULL)
	411	return -ENOMEM;
	412
	413	skb_put(pdu, LLCP_SEQUENCE_SIZE);
	414
	415	if (memcpy_fromiovec(skb_put(pdu, len), msg->msg_iov, len)) {
	416	kfree_skb(pdu);
	417	return -EFAULT;
	418	}
	419
	420	skb_queue_head(&sock->tx_queue, pdu);
	421
	422	sk = &sock->sk;
	423	lock_sock(sk);
	424
	425	nfc_llcp_queue_i_frames(sock);
	426
	427	release_sock(sk);
	428
	429	return 0;
	430	}
d094afa1 SO	431
	432	int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
	433	{
	434	struct sk_buff *skb;
	435	struct nfc_llcp_local *local;
	436
	437	pr_debug("Send rr nr %d\n", sock->recv_n);
	438
	439	local = sock->local;
	440	if (local == NULL)
	441	return -ENODEV;
	442
	443	skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
	444	if (skb == NULL)
	445	return -ENOMEM;
	446
	447	skb_put(skb, LLCP_SEQUENCE_SIZE);
	448
	449	skb->data[2] = sock->recv_n % 16;
	450
	451	skb_queue_head(&local->tx_queue, skb);
	452
	453	return 0;
	454	}