Commit | Line | Data |
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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 | |
98b32dec | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
d646960f SO |
16 | */ |
17 | ||
18 | #define pr_fmt(fmt) "llcp: %s: " fmt, __func__ | |
19 | ||
20 | #include <linux/init.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/nfc.h> | |
24 | ||
25 | #include <net/nfc/nfc.h> | |
26 | ||
30cc4587 | 27 | #include "nfc.h" |
d646960f SO |
28 | #include "llcp.h" |
29 | ||
30 | static u8 llcp_tlv_length[LLCP_TLV_MAX] = { | |
31 | 0, | |
32 | 1, /* VERSION */ | |
33 | 2, /* MIUX */ | |
34 | 2, /* WKS */ | |
35 | 1, /* LTO */ | |
36 | 1, /* RW */ | |
37 | 0, /* SN */ | |
38 | 1, /* OPT */ | |
39 | 0, /* SDREQ */ | |
40 | 2, /* SDRES */ | |
41 | ||
42 | }; | |
43 | ||
44 | static u8 llcp_tlv8(u8 *tlv, u8 type) | |
45 | { | |
46 | if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) | |
47 | return 0; | |
48 | ||
49 | return tlv[2]; | |
50 | } | |
51 | ||
76762b73 | 52 | static u16 llcp_tlv16(u8 *tlv, u8 type) |
d646960f SO |
53 | { |
54 | if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) | |
55 | return 0; | |
56 | ||
57 | return be16_to_cpu(*((__be16 *)(tlv + 2))); | |
58 | } | |
59 | ||
60 | ||
61 | static u8 llcp_tlv_version(u8 *tlv) | |
62 | { | |
63 | return llcp_tlv8(tlv, LLCP_TLV_VERSION); | |
64 | } | |
65 | ||
66 | static u16 llcp_tlv_miux(u8 *tlv) | |
67 | { | |
76762b73 | 68 | return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff; |
d646960f SO |
69 | } |
70 | ||
71 | static u16 llcp_tlv_wks(u8 *tlv) | |
72 | { | |
73 | return llcp_tlv16(tlv, LLCP_TLV_WKS); | |
74 | } | |
75 | ||
76 | static u16 llcp_tlv_lto(u8 *tlv) | |
77 | { | |
78 | return llcp_tlv8(tlv, LLCP_TLV_LTO); | |
79 | } | |
80 | ||
81 | static u8 llcp_tlv_opt(u8 *tlv) | |
82 | { | |
83 | return llcp_tlv8(tlv, LLCP_TLV_OPT); | |
84 | } | |
85 | ||
86 | static u8 llcp_tlv_rw(u8 *tlv) | |
87 | { | |
88 | return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf; | |
89 | } | |
90 | ||
91 | u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length) | |
92 | { | |
93 | u8 *tlv, length; | |
94 | ||
95 | pr_debug("type %d\n", type); | |
96 | ||
97 | if (type >= LLCP_TLV_MAX) | |
98 | return NULL; | |
99 | ||
100 | length = llcp_tlv_length[type]; | |
101 | if (length == 0 && value_length == 0) | |
102 | return NULL; | |
324b0af6 | 103 | else if (length == 0) |
d646960f SO |
104 | length = value_length; |
105 | ||
106 | *tlv_length = 2 + length; | |
107 | tlv = kzalloc(2 + length, GFP_KERNEL); | |
108 | if (tlv == NULL) | |
109 | return tlv; | |
110 | ||
111 | tlv[0] = type; | |
112 | tlv[1] = length; | |
113 | memcpy(tlv + 2, value, length); | |
114 | ||
115 | return tlv; | |
116 | } | |
117 | ||
e0ae7bac TE |
118 | struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap) |
119 | { | |
120 | struct nfc_llcp_sdp_tlv *sdres; | |
121 | u8 value[2]; | |
122 | ||
123 | sdres = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL); | |
124 | if (sdres == NULL) | |
125 | return NULL; | |
126 | ||
127 | value[0] = tid; | |
128 | value[1] = sap; | |
129 | ||
130 | sdres->tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, value, 2, | |
131 | &sdres->tlv_len); | |
132 | if (sdres->tlv == NULL) { | |
133 | kfree(sdres); | |
134 | return NULL; | |
135 | } | |
136 | ||
137 | sdres->tid = tid; | |
138 | sdres->sap = sap; | |
139 | ||
140 | INIT_HLIST_NODE(&sdres->node); | |
141 | ||
142 | return sdres; | |
143 | } | |
144 | ||
d9b8d8e1 TE |
145 | struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri, |
146 | size_t uri_len) | |
147 | { | |
148 | struct nfc_llcp_sdp_tlv *sdreq; | |
149 | ||
150 | pr_debug("uri: %s, len: %zu\n", uri, uri_len); | |
151 | ||
152 | sdreq = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL); | |
153 | if (sdreq == NULL) | |
154 | return NULL; | |
155 | ||
156 | sdreq->tlv_len = uri_len + 3; | |
157 | ||
158 | if (uri[uri_len - 1] == 0) | |
159 | sdreq->tlv_len--; | |
160 | ||
161 | sdreq->tlv = kzalloc(sdreq->tlv_len + 1, GFP_KERNEL); | |
162 | if (sdreq->tlv == NULL) { | |
163 | kfree(sdreq); | |
164 | return NULL; | |
165 | } | |
166 | ||
167 | sdreq->tlv[0] = LLCP_TLV_SDREQ; | |
168 | sdreq->tlv[1] = sdreq->tlv_len - 2; | |
169 | sdreq->tlv[2] = tid; | |
170 | ||
171 | sdreq->tid = tid; | |
172 | sdreq->uri = sdreq->tlv + 3; | |
173 | memcpy(sdreq->uri, uri, uri_len); | |
174 | ||
40213fa8 TE |
175 | sdreq->time = jiffies; |
176 | ||
d9b8d8e1 TE |
177 | INIT_HLIST_NODE(&sdreq->node); |
178 | ||
179 | return sdreq; | |
180 | } | |
181 | ||
e0ae7bac TE |
182 | void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp) |
183 | { | |
184 | kfree(sdp->tlv); | |
185 | kfree(sdp); | |
186 | } | |
187 | ||
d9b8d8e1 TE |
188 | void nfc_llcp_free_sdp_tlv_list(struct hlist_head *head) |
189 | { | |
190 | struct nfc_llcp_sdp_tlv *sdp; | |
191 | struct hlist_node *n; | |
192 | ||
193 | hlist_for_each_entry_safe(sdp, n, head, node) { | |
194 | hlist_del(&sdp->node); | |
195 | ||
196 | nfc_llcp_free_sdp_tlv(sdp); | |
197 | } | |
198 | } | |
199 | ||
7a06e586 SO |
200 | int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local, |
201 | u8 *tlv_array, u16 tlv_array_len) | |
d646960f SO |
202 | { |
203 | u8 *tlv = tlv_array, type, length, offset = 0; | |
204 | ||
205 | pr_debug("TLV array length %d\n", tlv_array_len); | |
206 | ||
207 | if (local == NULL) | |
208 | return -ENODEV; | |
209 | ||
210 | while (offset < tlv_array_len) { | |
211 | type = tlv[0]; | |
212 | length = tlv[1]; | |
213 | ||
214 | pr_debug("type 0x%x length %d\n", type, length); | |
215 | ||
216 | switch (type) { | |
217 | case LLCP_TLV_VERSION: | |
218 | local->remote_version = llcp_tlv_version(tlv); | |
219 | break; | |
220 | case LLCP_TLV_MIUX: | |
221 | local->remote_miu = llcp_tlv_miux(tlv) + 128; | |
222 | break; | |
223 | case LLCP_TLV_WKS: | |
224 | local->remote_wks = llcp_tlv_wks(tlv); | |
225 | break; | |
226 | case LLCP_TLV_LTO: | |
227 | local->remote_lto = llcp_tlv_lto(tlv) * 10; | |
228 | break; | |
229 | case LLCP_TLV_OPT: | |
230 | local->remote_opt = llcp_tlv_opt(tlv); | |
231 | break; | |
7a06e586 SO |
232 | default: |
233 | pr_err("Invalid gt tlv value 0x%x\n", type); | |
234 | break; | |
235 | } | |
236 | ||
237 | offset += length + 2; | |
238 | tlv += length + 2; | |
239 | } | |
240 | ||
241 | pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n", | |
242 | local->remote_version, local->remote_miu, | |
243 | local->remote_lto, local->remote_opt, | |
244 | local->remote_wks); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
249 | int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock, | |
250 | u8 *tlv_array, u16 tlv_array_len) | |
251 | { | |
252 | u8 *tlv = tlv_array, type, length, offset = 0; | |
253 | ||
254 | pr_debug("TLV array length %d\n", tlv_array_len); | |
255 | ||
256 | if (sock == NULL) | |
257 | return -ENOTCONN; | |
258 | ||
259 | while (offset < tlv_array_len) { | |
260 | type = tlv[0]; | |
261 | length = tlv[1]; | |
262 | ||
263 | pr_debug("type 0x%x length %d\n", type, length); | |
264 | ||
265 | switch (type) { | |
93d7e490 | 266 | case LLCP_TLV_MIUX: |
e4306bec | 267 | sock->remote_miu = llcp_tlv_miux(tlv) + 128; |
93d7e490 | 268 | break; |
d646960f | 269 | case LLCP_TLV_RW: |
e4306bec | 270 | sock->remote_rw = llcp_tlv_rw(tlv); |
d646960f | 271 | break; |
9dda50f4 SO |
272 | case LLCP_TLV_SN: |
273 | break; | |
d646960f SO |
274 | default: |
275 | pr_err("Invalid gt tlv value 0x%x\n", type); | |
276 | break; | |
277 | } | |
278 | ||
279 | offset += length + 2; | |
280 | tlv += length + 2; | |
281 | } | |
282 | ||
e4306bec SO |
283 | pr_debug("sock %p rw %d miu %d\n", sock, |
284 | sock->remote_rw, sock->remote_miu); | |
d646960f SO |
285 | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static struct sk_buff *llcp_add_header(struct sk_buff *pdu, | |
427a2eb1 | 290 | u8 dsap, u8 ssap, u8 ptype) |
d646960f SO |
291 | { |
292 | u8 header[2]; | |
293 | ||
294 | pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); | |
295 | ||
296 | header[0] = (u8)((dsap << 2) | (ptype >> 2)); | |
297 | header[1] = (u8)((ptype << 6) | ssap); | |
298 | ||
299 | pr_debug("header 0x%x 0x%x\n", header[0], header[1]); | |
300 | ||
301 | memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE); | |
302 | ||
303 | return pdu; | |
304 | } | |
305 | ||
427a2eb1 SO |
306 | static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv, |
307 | u8 tlv_length) | |
d646960f SO |
308 | { |
309 | /* XXX Add an skb length check */ | |
310 | ||
311 | if (tlv == NULL) | |
312 | return NULL; | |
313 | ||
314 | memcpy(skb_put(pdu, tlv_length), tlv, tlv_length); | |
315 | ||
316 | return pdu; | |
317 | } | |
318 | ||
319 | static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock, | |
427a2eb1 | 320 | u8 cmd, u16 size) |
d646960f SO |
321 | { |
322 | struct sk_buff *skb; | |
323 | int err; | |
324 | ||
325 | if (sock->ssap == 0) | |
326 | return NULL; | |
327 | ||
328 | skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, | |
427a2eb1 | 329 | size + LLCP_HEADER_SIZE, &err); |
d646960f SO |
330 | if (skb == NULL) { |
331 | pr_err("Could not allocate PDU\n"); | |
332 | return NULL; | |
333 | } | |
334 | ||
335 | skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd); | |
336 | ||
337 | return skb; | |
338 | } | |
339 | ||
58e3dd15 | 340 | int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock) |
d646960f SO |
341 | { |
342 | struct sk_buff *skb; | |
343 | struct nfc_dev *dev; | |
344 | struct nfc_llcp_local *local; | |
d646960f SO |
345 | |
346 | pr_debug("Sending DISC\n"); | |
347 | ||
348 | local = sock->local; | |
349 | if (local == NULL) | |
350 | return -ENODEV; | |
351 | ||
352 | dev = sock->dev; | |
353 | if (dev == NULL) | |
354 | return -ENODEV; | |
355 | ||
92223906 | 356 | skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0); |
d646960f SO |
357 | if (skb == NULL) |
358 | return -ENOMEM; | |
359 | ||
d646960f SO |
360 | skb_queue_tail(&local->tx_queue, skb); |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
365 | int nfc_llcp_send_symm(struct nfc_dev *dev) | |
366 | { | |
367 | struct sk_buff *skb; | |
368 | struct nfc_llcp_local *local; | |
369 | u16 size = 0; | |
370 | ||
371 | pr_debug("Sending SYMM\n"); | |
372 | ||
373 | local = nfc_llcp_find_local(dev); | |
374 | if (local == NULL) | |
375 | return -ENODEV; | |
376 | ||
377 | size += LLCP_HEADER_SIZE; | |
378 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
379 | ||
380 | skb = alloc_skb(size, GFP_KERNEL); | |
381 | if (skb == NULL) | |
382 | return -ENOMEM; | |
383 | ||
384 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
385 | ||
386 | skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM); | |
387 | ||
2c2d45bd TE |
388 | __net_timestamp(skb); |
389 | ||
57be1f3f | 390 | nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_TX); |
4463523b | 391 | |
d646960f | 392 | return nfc_data_exchange(dev, local->target_idx, skb, |
427a2eb1 | 393 | nfc_llcp_recv, local); |
d646960f SO |
394 | } |
395 | ||
396 | int nfc_llcp_send_connect(struct nfc_llcp_sock *sock) | |
397 | { | |
398 | struct nfc_llcp_local *local; | |
399 | struct sk_buff *skb; | |
400 | u8 *service_name_tlv = NULL, service_name_tlv_length; | |
eda21f16 | 401 | u8 *miux_tlv = NULL, miux_tlv_length; |
06d44f80 | 402 | u8 *rw_tlv = NULL, rw_tlv_length, rw; |
d646960f | 403 | int err; |
e5b53c0a CR |
404 | u16 size = 0; |
405 | __be16 miux; | |
d646960f SO |
406 | |
407 | pr_debug("Sending CONNECT\n"); | |
408 | ||
409 | local = sock->local; | |
410 | if (local == NULL) | |
411 | return -ENODEV; | |
412 | ||
413 | if (sock->service_name != NULL) { | |
414 | service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN, | |
427a2eb1 SO |
415 | sock->service_name, |
416 | sock->service_name_len, | |
417 | &service_name_tlv_length); | |
d646960f SO |
418 | size += service_name_tlv_length; |
419 | } | |
420 | ||
06d44f80 | 421 | /* If the socket parameters are not set, use the local ones */ |
5eef6669 SO |
422 | miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ? |
423 | local->miux : sock->miux; | |
06d44f80 SO |
424 | rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw; |
425 | ||
426 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, | |
427a2eb1 | 427 | &miux_tlv_length); |
eda21f16 SO |
428 | size += miux_tlv_length; |
429 | ||
06d44f80 | 430 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); |
eda21f16 SO |
431 | size += rw_tlv_length; |
432 | ||
d646960f SO |
433 | pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len); |
434 | ||
435 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size); | |
436 | if (skb == NULL) { | |
437 | err = -ENOMEM; | |
438 | goto error_tlv; | |
439 | } | |
440 | ||
de9e5aeb TE |
441 | llcp_add_tlv(skb, service_name_tlv, service_name_tlv_length); |
442 | llcp_add_tlv(skb, miux_tlv, miux_tlv_length); | |
443 | llcp_add_tlv(skb, rw_tlv, rw_tlv_length); | |
eda21f16 | 444 | |
d646960f SO |
445 | skb_queue_tail(&local->tx_queue, skb); |
446 | ||
447 | return 0; | |
448 | ||
449 | error_tlv: | |
450 | pr_err("error %d\n", err); | |
451 | ||
452 | kfree(service_name_tlv); | |
eda21f16 SO |
453 | kfree(miux_tlv); |
454 | kfree(rw_tlv); | |
d646960f SO |
455 | |
456 | return err; | |
457 | } | |
458 | ||
459 | int nfc_llcp_send_cc(struct nfc_llcp_sock *sock) | |
460 | { | |
461 | struct nfc_llcp_local *local; | |
462 | struct sk_buff *skb; | |
eda21f16 | 463 | u8 *miux_tlv = NULL, miux_tlv_length; |
06d44f80 | 464 | u8 *rw_tlv = NULL, rw_tlv_length, rw; |
eda21f16 | 465 | int err; |
e5b53c0a CR |
466 | u16 size = 0; |
467 | __be16 miux; | |
d646960f SO |
468 | |
469 | pr_debug("Sending CC\n"); | |
470 | ||
471 | local = sock->local; | |
472 | if (local == NULL) | |
473 | return -ENODEV; | |
474 | ||
06d44f80 | 475 | /* If the socket parameters are not set, use the local ones */ |
5eef6669 SO |
476 | miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ? |
477 | local->miux : sock->miux; | |
06d44f80 SO |
478 | rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw; |
479 | ||
480 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, | |
427a2eb1 | 481 | &miux_tlv_length); |
eda21f16 SO |
482 | size += miux_tlv_length; |
483 | ||
06d44f80 | 484 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); |
eda21f16 SO |
485 | size += rw_tlv_length; |
486 | ||
487 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size); | |
488 | if (skb == NULL) { | |
489 | err = -ENOMEM; | |
490 | goto error_tlv; | |
491 | } | |
492 | ||
de9e5aeb TE |
493 | llcp_add_tlv(skb, miux_tlv, miux_tlv_length); |
494 | llcp_add_tlv(skb, rw_tlv, rw_tlv_length); | |
d646960f SO |
495 | |
496 | skb_queue_tail(&local->tx_queue, skb); | |
497 | ||
498 | return 0; | |
eda21f16 SO |
499 | |
500 | error_tlv: | |
501 | pr_err("error %d\n", err); | |
502 | ||
503 | kfree(miux_tlv); | |
504 | kfree(rw_tlv); | |
505 | ||
506 | return err; | |
d646960f SO |
507 | } |
508 | ||
e0ae7bac TE |
509 | static struct sk_buff *nfc_llcp_allocate_snl(struct nfc_llcp_local *local, |
510 | size_t tlv_length) | |
c43bb03d SO |
511 | { |
512 | struct sk_buff *skb; | |
513 | struct nfc_dev *dev; | |
c43bb03d SO |
514 | u16 size = 0; |
515 | ||
c43bb03d | 516 | if (local == NULL) |
e0ae7bac | 517 | return ERR_PTR(-ENODEV); |
c43bb03d SO |
518 | |
519 | dev = local->dev; | |
520 | if (dev == NULL) | |
e0ae7bac | 521 | return ERR_PTR(-ENODEV); |
c43bb03d SO |
522 | |
523 | size += LLCP_HEADER_SIZE; | |
524 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
e0ae7bac | 525 | size += tlv_length; |
c43bb03d SO |
526 | |
527 | skb = alloc_skb(size, GFP_KERNEL); | |
e0ae7bac TE |
528 | if (skb == NULL) |
529 | return ERR_PTR(-ENOMEM); | |
c43bb03d SO |
530 | |
531 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
532 | ||
533 | skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL); | |
534 | ||
e0ae7bac TE |
535 | return skb; |
536 | } | |
c43bb03d | 537 | |
e0ae7bac TE |
538 | int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local, |
539 | struct hlist_head *tlv_list, size_t tlvs_len) | |
540 | { | |
541 | struct nfc_llcp_sdp_tlv *sdp; | |
542 | struct hlist_node *n; | |
543 | struct sk_buff *skb; | |
544 | ||
545 | skb = nfc_llcp_allocate_snl(local, tlvs_len); | |
546 | if (IS_ERR(skb)) | |
547 | return PTR_ERR(skb); | |
548 | ||
549 | hlist_for_each_entry_safe(sdp, n, tlv_list, node) { | |
550 | memcpy(skb_put(skb, sdp->tlv_len), sdp->tlv, sdp->tlv_len); | |
c43bb03d | 551 | |
e0ae7bac TE |
552 | hlist_del(&sdp->node); |
553 | ||
554 | nfc_llcp_free_sdp_tlv(sdp); | |
555 | } | |
556 | ||
557 | skb_queue_tail(&local->tx_queue, skb); | |
c43bb03d SO |
558 | |
559 | return 0; | |
560 | } | |
561 | ||
d9b8d8e1 TE |
562 | int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local, |
563 | struct hlist_head *tlv_list, size_t tlvs_len) | |
564 | { | |
565 | struct nfc_llcp_sdp_tlv *sdreq; | |
566 | struct hlist_node *n; | |
567 | struct sk_buff *skb; | |
568 | ||
569 | skb = nfc_llcp_allocate_snl(local, tlvs_len); | |
570 | if (IS_ERR(skb)) | |
571 | return PTR_ERR(skb); | |
572 | ||
573 | mutex_lock(&local->sdreq_lock); | |
574 | ||
40213fa8 TE |
575 | if (hlist_empty(&local->pending_sdreqs)) |
576 | mod_timer(&local->sdreq_timer, | |
577 | jiffies + msecs_to_jiffies(3 * local->remote_lto)); | |
578 | ||
d9b8d8e1 TE |
579 | hlist_for_each_entry_safe(sdreq, n, tlv_list, node) { |
580 | pr_debug("tid %d for %s\n", sdreq->tid, sdreq->uri); | |
581 | ||
582 | memcpy(skb_put(skb, sdreq->tlv_len), sdreq->tlv, | |
583 | sdreq->tlv_len); | |
584 | ||
585 | hlist_del(&sdreq->node); | |
586 | ||
587 | hlist_add_head(&sdreq->node, &local->pending_sdreqs); | |
588 | } | |
589 | ||
590 | mutex_unlock(&local->sdreq_lock); | |
591 | ||
592 | skb_queue_tail(&local->tx_queue, skb); | |
593 | ||
594 | return 0; | |
595 | } | |
596 | ||
d646960f SO |
597 | int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason) |
598 | { | |
599 | struct sk_buff *skb; | |
600 | struct nfc_dev *dev; | |
601 | u16 size = 1; /* Reason code */ | |
602 | ||
603 | pr_debug("Sending DM reason 0x%x\n", reason); | |
604 | ||
605 | if (local == NULL) | |
606 | return -ENODEV; | |
607 | ||
608 | dev = local->dev; | |
609 | if (dev == NULL) | |
610 | return -ENODEV; | |
611 | ||
612 | size += LLCP_HEADER_SIZE; | |
613 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
614 | ||
615 | skb = alloc_skb(size, GFP_KERNEL); | |
616 | if (skb == NULL) | |
617 | return -ENOMEM; | |
618 | ||
619 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
620 | ||
ffc29315 | 621 | skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM); |
d646960f SO |
622 | |
623 | memcpy(skb_put(skb, 1), &reason, 1); | |
624 | ||
625 | skb_queue_head(&local->tx_queue, skb); | |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
53a0ac2e | 630 | int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock, |
427a2eb1 | 631 | struct msghdr *msg, size_t len) |
53a0ac2e SO |
632 | { |
633 | struct sk_buff *pdu; | |
e65b0f46 SO |
634 | struct sock *sk = &sock->sk; |
635 | struct nfc_llcp_local *local; | |
636 | size_t frag_len = 0, remaining_len; | |
637 | u8 *msg_data, *msg_ptr; | |
66cbfa10 | 638 | u16 remote_miu; |
53a0ac2e | 639 | |
e65b0f46 | 640 | pr_debug("Send I frame len %zd\n", len); |
53a0ac2e | 641 | |
e65b0f46 SO |
642 | local = sock->local; |
643 | if (local == NULL) | |
644 | return -ENODEV; | |
53a0ac2e | 645 | |
dd2bf43f SO |
646 | /* Remote is ready but has not acknowledged our frames */ |
647 | if((sock->remote_ready && | |
e4306bec SO |
648 | skb_queue_len(&sock->tx_pending_queue) >= sock->remote_rw && |
649 | skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) { | |
dd2bf43f SO |
650 | pr_err("Pending queue is full %d frames\n", |
651 | skb_queue_len(&sock->tx_pending_queue)); | |
652 | return -ENOBUFS; | |
653 | } | |
654 | ||
655 | /* Remote is not ready and we've been queueing enough frames */ | |
656 | if ((!sock->remote_ready && | |
e4306bec | 657 | skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) { |
dd2bf43f SO |
658 | pr_err("Tx queue is full %d frames\n", |
659 | skb_queue_len(&sock->tx_queue)); | |
660 | return -ENOBUFS; | |
661 | } | |
662 | ||
81ca7835 | 663 | msg_data = kmalloc(len, GFP_USER | __GFP_NOWARN); |
e65b0f46 SO |
664 | if (msg_data == NULL) |
665 | return -ENOMEM; | |
53a0ac2e | 666 | |
6ce8e9ce | 667 | if (memcpy_from_msg(msg_data, msg, len)) { |
427a2eb1 SO |
668 | kfree(msg_data); |
669 | return -EFAULT; | |
53a0ac2e SO |
670 | } |
671 | ||
e65b0f46 SO |
672 | remaining_len = len; |
673 | msg_ptr = msg_data; | |
674 | ||
0b23d666 | 675 | do { |
66cbfa10 | 676 | remote_miu = sock->remote_miu > LLCP_MAX_MIU ? |
11bfb1c4 | 677 | LLCP_DEFAULT_MIU : sock->remote_miu; |
66cbfa10 TE |
678 | |
679 | frag_len = min_t(size_t, remote_miu, remaining_len); | |
53a0ac2e | 680 | |
e65b0f46 SO |
681 | pr_debug("Fragment %zd bytes remaining %zd", |
682 | frag_len, remaining_len); | |
53a0ac2e | 683 | |
e65b0f46 SO |
684 | pdu = llcp_allocate_pdu(sock, LLCP_PDU_I, |
685 | frag_len + LLCP_SEQUENCE_SIZE); | |
43d53c29 SJ |
686 | if (pdu == NULL) { |
687 | kfree(msg_data); | |
e65b0f46 | 688 | return -ENOMEM; |
43d53c29 | 689 | } |
e65b0f46 SO |
690 | |
691 | skb_put(pdu, LLCP_SEQUENCE_SIZE); | |
692 | ||
0b23d666 OG |
693 | if (likely(frag_len > 0)) |
694 | memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len); | |
e65b0f46 | 695 | |
bdbc59b3 | 696 | skb_queue_tail(&sock->tx_queue, pdu); |
e65b0f46 SO |
697 | |
698 | lock_sock(sk); | |
699 | ||
700 | nfc_llcp_queue_i_frames(sock); | |
701 | ||
702 | release_sock(sk); | |
703 | ||
704 | remaining_len -= frag_len; | |
b4838d12 | 705 | msg_ptr += frag_len; |
0b23d666 | 706 | } while (remaining_len > 0); |
53a0ac2e | 707 | |
e65b0f46 | 708 | kfree(msg_data); |
53a0ac2e | 709 | |
43472fff | 710 | return len; |
53a0ac2e | 711 | } |
d094afa1 | 712 | |
94f418a2 SO |
713 | int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap, |
714 | struct msghdr *msg, size_t len) | |
715 | { | |
716 | struct sk_buff *pdu; | |
717 | struct nfc_llcp_local *local; | |
718 | size_t frag_len = 0, remaining_len; | |
6e950fd2 | 719 | u8 *msg_ptr, *msg_data; |
66cbfa10 | 720 | u16 remote_miu; |
94f418a2 SO |
721 | int err; |
722 | ||
723 | pr_debug("Send UI frame len %zd\n", len); | |
724 | ||
725 | local = sock->local; | |
726 | if (local == NULL) | |
727 | return -ENODEV; | |
728 | ||
81ca7835 | 729 | msg_data = kmalloc(len, GFP_USER | __GFP_NOWARN); |
6e950fd2 SO |
730 | if (msg_data == NULL) |
731 | return -ENOMEM; | |
732 | ||
6ce8e9ce | 733 | if (memcpy_from_msg(msg_data, msg, len)) { |
6e950fd2 SO |
734 | kfree(msg_data); |
735 | return -EFAULT; | |
736 | } | |
737 | ||
94f418a2 | 738 | remaining_len = len; |
6e950fd2 | 739 | msg_ptr = msg_data; |
94f418a2 | 740 | |
0b23d666 | 741 | do { |
66cbfa10 TE |
742 | remote_miu = sock->remote_miu > LLCP_MAX_MIU ? |
743 | local->remote_miu : sock->remote_miu; | |
744 | ||
745 | frag_len = min_t(size_t, remote_miu, remaining_len); | |
94f418a2 SO |
746 | |
747 | pr_debug("Fragment %zd bytes remaining %zd", | |
748 | frag_len, remaining_len); | |
749 | ||
750 | pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, | |
751 | frag_len + LLCP_HEADER_SIZE, &err); | |
752 | if (pdu == NULL) { | |
753 | pr_err("Could not allocate PDU\n"); | |
754 | continue; | |
755 | } | |
756 | ||
757 | pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI); | |
758 | ||
0b23d666 OG |
759 | if (likely(frag_len > 0)) |
760 | memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len); | |
94f418a2 SO |
761 | |
762 | /* No need to check for the peer RW for UI frames */ | |
763 | skb_queue_tail(&local->tx_queue, pdu); | |
764 | ||
765 | remaining_len -= frag_len; | |
766 | msg_ptr += frag_len; | |
0b23d666 | 767 | } while (remaining_len > 0); |
94f418a2 | 768 | |
6e950fd2 SO |
769 | kfree(msg_data); |
770 | ||
94f418a2 SO |
771 | return len; |
772 | } | |
773 | ||
d094afa1 SO |
774 | int nfc_llcp_send_rr(struct nfc_llcp_sock *sock) |
775 | { | |
776 | struct sk_buff *skb; | |
777 | struct nfc_llcp_local *local; | |
778 | ||
779 | pr_debug("Send rr nr %d\n", sock->recv_n); | |
780 | ||
781 | local = sock->local; | |
782 | if (local == NULL) | |
783 | return -ENODEV; | |
784 | ||
785 | skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE); | |
786 | if (skb == NULL) | |
787 | return -ENOMEM; | |
788 | ||
789 | skb_put(skb, LLCP_SEQUENCE_SIZE); | |
790 | ||
279cf174 | 791 | skb->data[2] = sock->recv_n; |
d094afa1 SO |
792 | |
793 | skb_queue_head(&local->tx_queue, skb); | |
794 | ||
795 | return 0; | |
796 | } |