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 u16 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) & 0x7ff;
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)
105 else if (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_gb_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 pr_err("Invalid gt tlv value 0x%x\n", type);
157 offset += length + 2;
161 pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n",
162 local->remote_version, local->remote_miu,
163 local->remote_lto, local->remote_opt,
169 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
170 u8 *tlv_array, u16 tlv_array_len)
172 u8 *tlv = tlv_array, type, length, offset = 0;
174 pr_debug("TLV array length %d\n", tlv_array_len);
179 while (offset < tlv_array_len) {
183 pr_debug("type 0x%x length %d\n", type, length);
187 sock->miu = llcp_tlv_miux(tlv) + 128;
190 sock->rw = llcp_tlv_rw(tlv);
195 pr_err("Invalid gt tlv value 0x%x\n", type);
199 offset += length + 2;
203 pr_debug("sock %p rw %d miu %d\n", sock, sock->rw, sock->miu);
208 static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
209 u8 dsap, u8 ssap, u8 ptype)
213 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
215 header[0] = (u8)((dsap << 2) | (ptype >> 2));
216 header[1] = (u8)((ptype << 6) | ssap);
218 pr_debug("header 0x%x 0x%x\n", header[0], header[1]);
220 memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE);
225 static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv,
228 /* XXX Add an skb length check */
233 memcpy(skb_put(pdu, tlv_length), tlv, tlv_length);
238 static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock,
247 skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
248 size + LLCP_HEADER_SIZE, &err);
250 pr_err("Could not allocate PDU\n");
254 skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd);
259 int nfc_llcp_disconnect(struct nfc_llcp_sock *sock)
263 struct nfc_llcp_local *local;
266 pr_debug("Sending DISC\n");
276 size += LLCP_HEADER_SIZE;
277 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
279 skb = alloc_skb(size, GFP_ATOMIC);
283 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
285 skb = llcp_add_header(skb, sock->dsap, sock->ssap, LLCP_PDU_DISC);
287 skb_queue_tail(&local->tx_queue, skb);
292 int nfc_llcp_send_symm(struct nfc_dev *dev)
295 struct nfc_llcp_local *local;
298 pr_debug("Sending SYMM\n");
300 local = nfc_llcp_find_local(dev);
304 size += LLCP_HEADER_SIZE;
305 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
307 skb = alloc_skb(size, GFP_KERNEL);
311 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
313 skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
315 return nfc_data_exchange(dev, local->target_idx, skb,
316 nfc_llcp_recv, local);
319 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
321 struct nfc_llcp_local *local;
323 u8 *service_name_tlv = NULL, service_name_tlv_length;
324 u8 *miux_tlv = NULL, miux_tlv_length;
325 u8 *rw_tlv = NULL, rw_tlv_length, rw;
330 pr_debug("Sending CONNECT\n");
336 if (sock->service_name != NULL) {
337 service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
339 sock->service_name_len,
340 &service_name_tlv_length);
341 size += service_name_tlv_length;
344 miux = cpu_to_be16(LLCP_MAX_MIUX);
345 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
347 size += miux_tlv_length;
350 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
351 size += rw_tlv_length;
353 pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
355 skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
361 if (service_name_tlv != NULL)
362 skb = llcp_add_tlv(skb, service_name_tlv,
363 service_name_tlv_length);
365 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
366 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
368 skb_queue_tail(&local->tx_queue, skb);
373 pr_err("error %d\n", err);
375 kfree(service_name_tlv);
382 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
384 struct nfc_llcp_local *local;
386 u8 *miux_tlv = NULL, miux_tlv_length;
387 u8 *rw_tlv = NULL, rw_tlv_length, rw;
392 pr_debug("Sending CC\n");
398 miux = cpu_to_be16(LLCP_MAX_MIUX);
399 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
401 size += miux_tlv_length;
404 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
405 size += rw_tlv_length;
407 skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
413 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
414 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
416 skb_queue_tail(&local->tx_queue, skb);
421 pr_err("error %d\n", err);
429 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
433 u16 size = 1; /* Reason code */
435 pr_debug("Sending DM reason 0x%x\n", reason);
444 size += LLCP_HEADER_SIZE;
445 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
447 skb = alloc_skb(size, GFP_KERNEL);
451 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
453 skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM);
455 memcpy(skb_put(skb, 1), &reason, 1);
457 skb_queue_head(&local->tx_queue, skb);
462 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
465 struct nfc_llcp_local *local;
467 pr_debug("Send DISC\n");
473 skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
477 skb_queue_head(&local->tx_queue, skb);
482 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
483 struct msghdr *msg, size_t len)
486 struct sock *sk = &sock->sk;
487 struct nfc_llcp_local *local;
488 size_t frag_len = 0, remaining_len;
489 u8 *msg_data, *msg_ptr;
491 pr_debug("Send I frame len %zd\n", len);
497 msg_data = kzalloc(len, GFP_KERNEL);
498 if (msg_data == NULL)
501 if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) {
509 while (remaining_len > 0) {
511 frag_len = min_t(size_t, sock->miu, remaining_len);
513 pr_debug("Fragment %zd bytes remaining %zd",
514 frag_len, remaining_len);
516 pdu = llcp_allocate_pdu(sock, LLCP_PDU_I,
517 frag_len + LLCP_SEQUENCE_SIZE);
521 skb_put(pdu, LLCP_SEQUENCE_SIZE);
523 memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
525 skb_queue_tail(&sock->tx_queue, pdu);
529 nfc_llcp_queue_i_frames(sock);
533 remaining_len -= frag_len;
542 int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
545 struct nfc_llcp_local *local;
547 pr_debug("Send rr nr %d\n", sock->recv_n);
553 skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
557 skb_put(skb, LLCP_SEQUENCE_SIZE);
559 skb->data[2] = sock->recv_n;
561 skb_queue_head(&local->tx_queue, skb);