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/module.h>
25 #include <linux/nfc.h>
27 #include <net/nfc/nfc.h>
32 static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
46 static u8 llcp_tlv8(u8 *tlv, u8 type)
48 if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
54 static u8 llcp_tlv16(u8 *tlv, u8 type)
56 if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
59 return be16_to_cpu(*((__be16 *)(tlv + 2)));
63 static u8 llcp_tlv_version(u8 *tlv)
65 return llcp_tlv8(tlv, LLCP_TLV_VERSION);
68 static u16 llcp_tlv_miux(u8 *tlv)
70 return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7f;
73 static u16 llcp_tlv_wks(u8 *tlv)
75 return llcp_tlv16(tlv, LLCP_TLV_WKS);
78 static u16 llcp_tlv_lto(u8 *tlv)
80 return llcp_tlv8(tlv, LLCP_TLV_LTO);
83 static u8 llcp_tlv_opt(u8 *tlv)
85 return llcp_tlv8(tlv, LLCP_TLV_OPT);
88 static u8 llcp_tlv_rw(u8 *tlv)
90 return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
93 u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length)
97 pr_debug("type %d\n", type);
99 if (type >= LLCP_TLV_MAX)
102 length = llcp_tlv_length[type];
103 if (length == 0 && value_length == 0)
106 length = value_length;
108 *tlv_length = 2 + length;
109 tlv = kzalloc(2 + length, GFP_KERNEL);
115 memcpy(tlv + 2, value, length);
120 int nfc_llcp_parse_tlv(struct nfc_llcp_local *local,
121 u8 *tlv_array, u16 tlv_array_len)
123 u8 *tlv = tlv_array, type, length, offset = 0;
125 pr_debug("TLV array length %d\n", tlv_array_len);
130 while (offset < tlv_array_len) {
134 pr_debug("type 0x%x length %d\n", type, length);
137 case LLCP_TLV_VERSION:
138 local->remote_version = llcp_tlv_version(tlv);
141 local->remote_miu = llcp_tlv_miux(tlv) + 128;
144 local->remote_wks = llcp_tlv_wks(tlv);
147 local->remote_lto = llcp_tlv_lto(tlv) * 10;
150 local->remote_opt = llcp_tlv_opt(tlv);
153 local->remote_rw = llcp_tlv_rw(tlv);
156 pr_err("Invalid gt tlv value 0x%x\n", type);
160 offset += length + 2;
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);
172 static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
173 u8 dsap, u8 ssap, u8 ptype)
177 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
179 header[0] = (u8)((dsap << 2) | (ptype >> 2));
180 header[1] = (u8)((ptype << 6) | ssap);
182 pr_debug("header 0x%x 0x%x\n", header[0], header[1]);
184 memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE);
189 static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv, u8 tlv_length)
191 /* XXX Add an skb length check */
196 memcpy(skb_put(pdu, tlv_length), tlv, tlv_length);
201 static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock,
210 skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
211 size + LLCP_HEADER_SIZE, &err);
213 pr_err("Could not allocate PDU\n");
217 skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd);
222 int nfc_llcp_disconnect(struct nfc_llcp_sock *sock)
226 struct nfc_llcp_local *local;
229 pr_debug("Sending DISC\n");
239 size += LLCP_HEADER_SIZE;
240 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
242 skb = alloc_skb(size, GFP_ATOMIC);
246 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
248 skb = llcp_add_header(skb, sock->ssap, sock->dsap, LLCP_PDU_DISC);
250 skb_queue_tail(&local->tx_queue, skb);
255 int nfc_llcp_send_symm(struct nfc_dev *dev)
258 struct nfc_llcp_local *local;
261 pr_debug("Sending SYMM\n");
263 local = nfc_llcp_find_local(dev);
267 size += LLCP_HEADER_SIZE;
268 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
270 skb = alloc_skb(size, GFP_KERNEL);
274 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
276 skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
278 return nfc_data_exchange(dev, local->target_idx, skb,
279 nfc_llcp_recv, local);
282 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
284 struct nfc_llcp_local *local;
286 u8 *service_name_tlv = NULL, service_name_tlv_length;
287 u8 *miux_tlv = NULL, miux_tlv_length;
288 u8 *rw_tlv = NULL, rw_tlv_length, rw;
293 pr_debug("Sending CONNECT\n");
299 if (sock->service_name != NULL) {
300 service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
302 sock->service_name_len,
303 &service_name_tlv_length);
304 size += service_name_tlv_length;
307 miux = cpu_to_be16(LLCP_MAX_MIUX);
308 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, &miux_tlv_length);
309 size += miux_tlv_length;
312 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
313 size += rw_tlv_length;
315 pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
317 skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
323 if (service_name_tlv != NULL)
324 skb = llcp_add_tlv(skb, service_name_tlv,
325 service_name_tlv_length);
327 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
328 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
330 skb_queue_tail(&local->tx_queue, skb);
335 pr_err("error %d\n", err);
337 kfree(service_name_tlv);
344 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
346 struct nfc_llcp_local *local;
348 u8 *miux_tlv = NULL, miux_tlv_length;
349 u8 *rw_tlv = NULL, rw_tlv_length, rw;
354 pr_debug("Sending CC\n");
360 miux = cpu_to_be16(LLCP_MAX_MIUX);
361 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, &miux_tlv_length);
362 size += miux_tlv_length;
365 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
366 size += rw_tlv_length;
368 skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
374 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
375 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
377 skb_queue_tail(&local->tx_queue, skb);
382 pr_err("error %d\n", err);
390 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
394 u16 size = 1; /* Reason code */
396 pr_debug("Sending DM reason 0x%x\n", reason);
405 size += LLCP_HEADER_SIZE;
406 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
408 skb = alloc_skb(size, GFP_KERNEL);
412 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
414 skb = llcp_add_header(skb, ssap, dsap, LLCP_PDU_DM);
416 memcpy(skb_put(skb, 1), &reason, 1);
418 skb_queue_head(&local->tx_queue, skb);
423 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
426 struct nfc_llcp_local *local;
428 pr_debug("Send DISC\n");
434 skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
438 skb_queue_head(&local->tx_queue, skb);
443 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
444 struct msghdr *msg, size_t len)
449 pr_debug("Send I frame\n");
451 pdu = llcp_allocate_pdu(sock, LLCP_PDU_I, len + LLCP_SEQUENCE_SIZE);
455 skb_put(pdu, LLCP_SEQUENCE_SIZE);
457 if (memcpy_fromiovec(skb_put(pdu, len), msg->msg_iov, len)) {
462 skb_queue_head(&sock->tx_queue, pdu);
467 nfc_llcp_queue_i_frames(sock);
474 int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
477 struct nfc_llcp_local *local;
479 pr_debug("Send rr nr %d\n", sock->recv_n);
485 skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
489 skb_put(skb, LLCP_SEQUENCE_SIZE);
491 skb->data[2] = sock->recv_n % 16;
493 skb_queue_head(&local->tx_queue, skb);