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 | ||
fe9c8426 KC |
152 | /* sdreq->tlv_len is u8, takes uri_len, + 3 for header, + 1 for NULL */ |
153 | if (WARN_ON_ONCE(uri_len > U8_MAX - 4)) | |
154 | return NULL; | |
155 | ||
d9b8d8e1 TE |
156 | sdreq = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL); |
157 | if (sdreq == NULL) | |
158 | return NULL; | |
159 | ||
160 | sdreq->tlv_len = uri_len + 3; | |
161 | ||
162 | if (uri[uri_len - 1] == 0) | |
163 | sdreq->tlv_len--; | |
164 | ||
165 | sdreq->tlv = kzalloc(sdreq->tlv_len + 1, GFP_KERNEL); | |
166 | if (sdreq->tlv == NULL) { | |
167 | kfree(sdreq); | |
168 | return NULL; | |
169 | } | |
170 | ||
171 | sdreq->tlv[0] = LLCP_TLV_SDREQ; | |
172 | sdreq->tlv[1] = sdreq->tlv_len - 2; | |
173 | sdreq->tlv[2] = tid; | |
174 | ||
175 | sdreq->tid = tid; | |
176 | sdreq->uri = sdreq->tlv + 3; | |
177 | memcpy(sdreq->uri, uri, uri_len); | |
178 | ||
40213fa8 TE |
179 | sdreq->time = jiffies; |
180 | ||
d9b8d8e1 TE |
181 | INIT_HLIST_NODE(&sdreq->node); |
182 | ||
183 | return sdreq; | |
184 | } | |
185 | ||
e0ae7bac TE |
186 | void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp) |
187 | { | |
188 | kfree(sdp->tlv); | |
189 | kfree(sdp); | |
190 | } | |
191 | ||
d9b8d8e1 TE |
192 | void nfc_llcp_free_sdp_tlv_list(struct hlist_head *head) |
193 | { | |
194 | struct nfc_llcp_sdp_tlv *sdp; | |
195 | struct hlist_node *n; | |
196 | ||
197 | hlist_for_each_entry_safe(sdp, n, head, node) { | |
198 | hlist_del(&sdp->node); | |
199 | ||
200 | nfc_llcp_free_sdp_tlv(sdp); | |
201 | } | |
202 | } | |
203 | ||
7a06e586 SO |
204 | int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local, |
205 | u8 *tlv_array, u16 tlv_array_len) | |
d646960f SO |
206 | { |
207 | u8 *tlv = tlv_array, type, length, offset = 0; | |
208 | ||
209 | pr_debug("TLV array length %d\n", tlv_array_len); | |
210 | ||
211 | if (local == NULL) | |
212 | return -ENODEV; | |
213 | ||
214 | while (offset < tlv_array_len) { | |
215 | type = tlv[0]; | |
216 | length = tlv[1]; | |
217 | ||
218 | pr_debug("type 0x%x length %d\n", type, length); | |
219 | ||
220 | switch (type) { | |
221 | case LLCP_TLV_VERSION: | |
222 | local->remote_version = llcp_tlv_version(tlv); | |
223 | break; | |
224 | case LLCP_TLV_MIUX: | |
225 | local->remote_miu = llcp_tlv_miux(tlv) + 128; | |
226 | break; | |
227 | case LLCP_TLV_WKS: | |
228 | local->remote_wks = llcp_tlv_wks(tlv); | |
229 | break; | |
230 | case LLCP_TLV_LTO: | |
231 | local->remote_lto = llcp_tlv_lto(tlv) * 10; | |
232 | break; | |
233 | case LLCP_TLV_OPT: | |
234 | local->remote_opt = llcp_tlv_opt(tlv); | |
235 | break; | |
7a06e586 SO |
236 | default: |
237 | pr_err("Invalid gt tlv value 0x%x\n", type); | |
238 | break; | |
239 | } | |
240 | ||
241 | offset += length + 2; | |
242 | tlv += length + 2; | |
243 | } | |
244 | ||
245 | pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n", | |
246 | local->remote_version, local->remote_miu, | |
247 | local->remote_lto, local->remote_opt, | |
248 | local->remote_wks); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock, | |
254 | u8 *tlv_array, u16 tlv_array_len) | |
255 | { | |
256 | u8 *tlv = tlv_array, type, length, offset = 0; | |
257 | ||
258 | pr_debug("TLV array length %d\n", tlv_array_len); | |
259 | ||
260 | if (sock == NULL) | |
261 | return -ENOTCONN; | |
262 | ||
263 | while (offset < tlv_array_len) { | |
264 | type = tlv[0]; | |
265 | length = tlv[1]; | |
266 | ||
267 | pr_debug("type 0x%x length %d\n", type, length); | |
268 | ||
269 | switch (type) { | |
93d7e490 | 270 | case LLCP_TLV_MIUX: |
e4306bec | 271 | sock->remote_miu = llcp_tlv_miux(tlv) + 128; |
93d7e490 | 272 | break; |
d646960f | 273 | case LLCP_TLV_RW: |
e4306bec | 274 | sock->remote_rw = llcp_tlv_rw(tlv); |
d646960f | 275 | break; |
9dda50f4 SO |
276 | case LLCP_TLV_SN: |
277 | break; | |
d646960f SO |
278 | default: |
279 | pr_err("Invalid gt tlv value 0x%x\n", type); | |
280 | break; | |
281 | } | |
282 | ||
283 | offset += length + 2; | |
284 | tlv += length + 2; | |
285 | } | |
286 | ||
e4306bec SO |
287 | pr_debug("sock %p rw %d miu %d\n", sock, |
288 | sock->remote_rw, sock->remote_miu); | |
d646960f SO |
289 | |
290 | return 0; | |
291 | } | |
292 | ||
293 | static struct sk_buff *llcp_add_header(struct sk_buff *pdu, | |
427a2eb1 | 294 | u8 dsap, u8 ssap, u8 ptype) |
d646960f SO |
295 | { |
296 | u8 header[2]; | |
297 | ||
298 | pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); | |
299 | ||
300 | header[0] = (u8)((dsap << 2) | (ptype >> 2)); | |
301 | header[1] = (u8)((ptype << 6) | ssap); | |
302 | ||
303 | pr_debug("header 0x%x 0x%x\n", header[0], header[1]); | |
304 | ||
59ae1d12 | 305 | skb_put_data(pdu, header, LLCP_HEADER_SIZE); |
d646960f SO |
306 | |
307 | return pdu; | |
308 | } | |
309 | ||
427a2eb1 SO |
310 | static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv, |
311 | u8 tlv_length) | |
d646960f SO |
312 | { |
313 | /* XXX Add an skb length check */ | |
314 | ||
315 | if (tlv == NULL) | |
316 | return NULL; | |
317 | ||
59ae1d12 | 318 | skb_put_data(pdu, tlv, tlv_length); |
d646960f SO |
319 | |
320 | return pdu; | |
321 | } | |
322 | ||
323 | static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock, | |
427a2eb1 | 324 | u8 cmd, u16 size) |
d646960f SO |
325 | { |
326 | struct sk_buff *skb; | |
327 | int err; | |
328 | ||
329 | if (sock->ssap == 0) | |
330 | return NULL; | |
331 | ||
332 | skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, | |
427a2eb1 | 333 | size + LLCP_HEADER_SIZE, &err); |
d646960f SO |
334 | if (skb == NULL) { |
335 | pr_err("Could not allocate PDU\n"); | |
336 | return NULL; | |
337 | } | |
338 | ||
339 | skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd); | |
340 | ||
341 | return skb; | |
342 | } | |
343 | ||
58e3dd15 | 344 | int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock) |
d646960f SO |
345 | { |
346 | struct sk_buff *skb; | |
347 | struct nfc_dev *dev; | |
348 | struct nfc_llcp_local *local; | |
d646960f SO |
349 | |
350 | pr_debug("Sending DISC\n"); | |
351 | ||
352 | local = sock->local; | |
353 | if (local == NULL) | |
354 | return -ENODEV; | |
355 | ||
356 | dev = sock->dev; | |
357 | if (dev == NULL) | |
358 | return -ENODEV; | |
359 | ||
92223906 | 360 | skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0); |
d646960f SO |
361 | if (skb == NULL) |
362 | return -ENOMEM; | |
363 | ||
d646960f SO |
364 | skb_queue_tail(&local->tx_queue, skb); |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | int nfc_llcp_send_symm(struct nfc_dev *dev) | |
370 | { | |
371 | struct sk_buff *skb; | |
372 | struct nfc_llcp_local *local; | |
373 | u16 size = 0; | |
374 | ||
375 | pr_debug("Sending SYMM\n"); | |
376 | ||
377 | local = nfc_llcp_find_local(dev); | |
378 | if (local == NULL) | |
379 | return -ENODEV; | |
380 | ||
381 | size += LLCP_HEADER_SIZE; | |
382 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
383 | ||
384 | skb = alloc_skb(size, GFP_KERNEL); | |
385 | if (skb == NULL) | |
386 | return -ENOMEM; | |
387 | ||
388 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
389 | ||
390 | skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM); | |
391 | ||
2c2d45bd TE |
392 | __net_timestamp(skb); |
393 | ||
57be1f3f | 394 | nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_TX); |
4463523b | 395 | |
d646960f | 396 | return nfc_data_exchange(dev, local->target_idx, skb, |
427a2eb1 | 397 | nfc_llcp_recv, local); |
d646960f SO |
398 | } |
399 | ||
400 | int nfc_llcp_send_connect(struct nfc_llcp_sock *sock) | |
401 | { | |
402 | struct nfc_llcp_local *local; | |
403 | struct sk_buff *skb; | |
404 | u8 *service_name_tlv = NULL, service_name_tlv_length; | |
eda21f16 | 405 | u8 *miux_tlv = NULL, miux_tlv_length; |
06d44f80 | 406 | u8 *rw_tlv = NULL, rw_tlv_length, rw; |
d646960f | 407 | int err; |
e5b53c0a CR |
408 | u16 size = 0; |
409 | __be16 miux; | |
d646960f SO |
410 | |
411 | pr_debug("Sending CONNECT\n"); | |
412 | ||
413 | local = sock->local; | |
414 | if (local == NULL) | |
415 | return -ENODEV; | |
416 | ||
417 | if (sock->service_name != NULL) { | |
418 | service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN, | |
427a2eb1 SO |
419 | sock->service_name, |
420 | sock->service_name_len, | |
421 | &service_name_tlv_length); | |
d646960f SO |
422 | size += service_name_tlv_length; |
423 | } | |
424 | ||
06d44f80 | 425 | /* If the socket parameters are not set, use the local ones */ |
5eef6669 SO |
426 | miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ? |
427 | local->miux : sock->miux; | |
06d44f80 SO |
428 | rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw; |
429 | ||
430 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, | |
427a2eb1 | 431 | &miux_tlv_length); |
eda21f16 SO |
432 | size += miux_tlv_length; |
433 | ||
06d44f80 | 434 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); |
eda21f16 SO |
435 | size += rw_tlv_length; |
436 | ||
d646960f SO |
437 | pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len); |
438 | ||
439 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size); | |
440 | if (skb == NULL) { | |
441 | err = -ENOMEM; | |
442 | goto error_tlv; | |
443 | } | |
444 | ||
de9e5aeb TE |
445 | llcp_add_tlv(skb, service_name_tlv, service_name_tlv_length); |
446 | llcp_add_tlv(skb, miux_tlv, miux_tlv_length); | |
447 | llcp_add_tlv(skb, rw_tlv, rw_tlv_length); | |
eda21f16 | 448 | |
d646960f SO |
449 | skb_queue_tail(&local->tx_queue, skb); |
450 | ||
256f3ee3 | 451 | err = 0; |
d646960f SO |
452 | |
453 | error_tlv: | |
256f3ee3 TE |
454 | if (err) |
455 | pr_err("error %d\n", err); | |
d646960f SO |
456 | |
457 | kfree(service_name_tlv); | |
eda21f16 SO |
458 | kfree(miux_tlv); |
459 | kfree(rw_tlv); | |
d646960f SO |
460 | |
461 | return err; | |
462 | } | |
463 | ||
464 | int nfc_llcp_send_cc(struct nfc_llcp_sock *sock) | |
465 | { | |
466 | struct nfc_llcp_local *local; | |
467 | struct sk_buff *skb; | |
eda21f16 | 468 | u8 *miux_tlv = NULL, miux_tlv_length; |
06d44f80 | 469 | u8 *rw_tlv = NULL, rw_tlv_length, rw; |
eda21f16 | 470 | int err; |
e5b53c0a CR |
471 | u16 size = 0; |
472 | __be16 miux; | |
d646960f SO |
473 | |
474 | pr_debug("Sending CC\n"); | |
475 | ||
476 | local = sock->local; | |
477 | if (local == NULL) | |
478 | return -ENODEV; | |
479 | ||
06d44f80 | 480 | /* If the socket parameters are not set, use the local ones */ |
5eef6669 SO |
481 | miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ? |
482 | local->miux : sock->miux; | |
06d44f80 SO |
483 | rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw; |
484 | ||
485 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, | |
427a2eb1 | 486 | &miux_tlv_length); |
eda21f16 SO |
487 | size += miux_tlv_length; |
488 | ||
06d44f80 | 489 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); |
eda21f16 SO |
490 | size += rw_tlv_length; |
491 | ||
492 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size); | |
493 | if (skb == NULL) { | |
494 | err = -ENOMEM; | |
495 | goto error_tlv; | |
496 | } | |
497 | ||
de9e5aeb TE |
498 | llcp_add_tlv(skb, miux_tlv, miux_tlv_length); |
499 | llcp_add_tlv(skb, rw_tlv, rw_tlv_length); | |
d646960f SO |
500 | |
501 | skb_queue_tail(&local->tx_queue, skb); | |
502 | ||
256f3ee3 | 503 | err = 0; |
eda21f16 SO |
504 | |
505 | error_tlv: | |
256f3ee3 TE |
506 | if (err) |
507 | pr_err("error %d\n", err); | |
eda21f16 SO |
508 | |
509 | kfree(miux_tlv); | |
510 | kfree(rw_tlv); | |
511 | ||
512 | return err; | |
d646960f SO |
513 | } |
514 | ||
e0ae7bac TE |
515 | static struct sk_buff *nfc_llcp_allocate_snl(struct nfc_llcp_local *local, |
516 | size_t tlv_length) | |
c43bb03d SO |
517 | { |
518 | struct sk_buff *skb; | |
519 | struct nfc_dev *dev; | |
c43bb03d SO |
520 | u16 size = 0; |
521 | ||
c43bb03d | 522 | if (local == NULL) |
e0ae7bac | 523 | return ERR_PTR(-ENODEV); |
c43bb03d SO |
524 | |
525 | dev = local->dev; | |
526 | if (dev == NULL) | |
e0ae7bac | 527 | return ERR_PTR(-ENODEV); |
c43bb03d SO |
528 | |
529 | size += LLCP_HEADER_SIZE; | |
530 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
e0ae7bac | 531 | size += tlv_length; |
c43bb03d SO |
532 | |
533 | skb = alloc_skb(size, GFP_KERNEL); | |
e0ae7bac TE |
534 | if (skb == NULL) |
535 | return ERR_PTR(-ENOMEM); | |
c43bb03d SO |
536 | |
537 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
538 | ||
539 | skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL); | |
540 | ||
e0ae7bac TE |
541 | return skb; |
542 | } | |
c43bb03d | 543 | |
e0ae7bac TE |
544 | int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local, |
545 | struct hlist_head *tlv_list, size_t tlvs_len) | |
546 | { | |
547 | struct nfc_llcp_sdp_tlv *sdp; | |
548 | struct hlist_node *n; | |
549 | struct sk_buff *skb; | |
550 | ||
551 | skb = nfc_llcp_allocate_snl(local, tlvs_len); | |
552 | if (IS_ERR(skb)) | |
553 | return PTR_ERR(skb); | |
554 | ||
555 | hlist_for_each_entry_safe(sdp, n, tlv_list, node) { | |
59ae1d12 | 556 | skb_put_data(skb, sdp->tlv, sdp->tlv_len); |
c43bb03d | 557 | |
e0ae7bac TE |
558 | hlist_del(&sdp->node); |
559 | ||
560 | nfc_llcp_free_sdp_tlv(sdp); | |
561 | } | |
562 | ||
563 | skb_queue_tail(&local->tx_queue, skb); | |
c43bb03d SO |
564 | |
565 | return 0; | |
566 | } | |
567 | ||
d9b8d8e1 TE |
568 | int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local, |
569 | struct hlist_head *tlv_list, size_t tlvs_len) | |
570 | { | |
571 | struct nfc_llcp_sdp_tlv *sdreq; | |
572 | struct hlist_node *n; | |
573 | struct sk_buff *skb; | |
574 | ||
575 | skb = nfc_llcp_allocate_snl(local, tlvs_len); | |
576 | if (IS_ERR(skb)) | |
577 | return PTR_ERR(skb); | |
578 | ||
579 | mutex_lock(&local->sdreq_lock); | |
580 | ||
40213fa8 TE |
581 | if (hlist_empty(&local->pending_sdreqs)) |
582 | mod_timer(&local->sdreq_timer, | |
583 | jiffies + msecs_to_jiffies(3 * local->remote_lto)); | |
584 | ||
d9b8d8e1 TE |
585 | hlist_for_each_entry_safe(sdreq, n, tlv_list, node) { |
586 | pr_debug("tid %d for %s\n", sdreq->tid, sdreq->uri); | |
587 | ||
59ae1d12 | 588 | skb_put_data(skb, sdreq->tlv, sdreq->tlv_len); |
d9b8d8e1 TE |
589 | |
590 | hlist_del(&sdreq->node); | |
591 | ||
592 | hlist_add_head(&sdreq->node, &local->pending_sdreqs); | |
593 | } | |
594 | ||
595 | mutex_unlock(&local->sdreq_lock); | |
596 | ||
597 | skb_queue_tail(&local->tx_queue, skb); | |
598 | ||
599 | return 0; | |
600 | } | |
601 | ||
d646960f SO |
602 | int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason) |
603 | { | |
604 | struct sk_buff *skb; | |
605 | struct nfc_dev *dev; | |
606 | u16 size = 1; /* Reason code */ | |
607 | ||
608 | pr_debug("Sending DM reason 0x%x\n", reason); | |
609 | ||
610 | if (local == NULL) | |
611 | return -ENODEV; | |
612 | ||
613 | dev = local->dev; | |
614 | if (dev == NULL) | |
615 | return -ENODEV; | |
616 | ||
617 | size += LLCP_HEADER_SIZE; | |
618 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
619 | ||
620 | skb = alloc_skb(size, GFP_KERNEL); | |
621 | if (skb == NULL) | |
622 | return -ENOMEM; | |
623 | ||
624 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
625 | ||
ffc29315 | 626 | skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM); |
d646960f | 627 | |
59ae1d12 | 628 | skb_put_data(skb, &reason, 1); |
d646960f SO |
629 | |
630 | skb_queue_head(&local->tx_queue, skb); | |
631 | ||
632 | return 0; | |
633 | } | |
634 | ||
53a0ac2e | 635 | int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock, |
427a2eb1 | 636 | struct msghdr *msg, size_t len) |
53a0ac2e SO |
637 | { |
638 | struct sk_buff *pdu; | |
e65b0f46 SO |
639 | struct sock *sk = &sock->sk; |
640 | struct nfc_llcp_local *local; | |
641 | size_t frag_len = 0, remaining_len; | |
642 | u8 *msg_data, *msg_ptr; | |
66cbfa10 | 643 | u16 remote_miu; |
53a0ac2e | 644 | |
e65b0f46 | 645 | pr_debug("Send I frame len %zd\n", len); |
53a0ac2e | 646 | |
e65b0f46 SO |
647 | local = sock->local; |
648 | if (local == NULL) | |
649 | return -ENODEV; | |
53a0ac2e | 650 | |
dd2bf43f SO |
651 | /* Remote is ready but has not acknowledged our frames */ |
652 | if((sock->remote_ready && | |
e4306bec SO |
653 | skb_queue_len(&sock->tx_pending_queue) >= sock->remote_rw && |
654 | skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) { | |
dd2bf43f SO |
655 | pr_err("Pending queue is full %d frames\n", |
656 | skb_queue_len(&sock->tx_pending_queue)); | |
657 | return -ENOBUFS; | |
658 | } | |
659 | ||
660 | /* Remote is not ready and we've been queueing enough frames */ | |
661 | if ((!sock->remote_ready && | |
e4306bec | 662 | skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) { |
dd2bf43f SO |
663 | pr_err("Tx queue is full %d frames\n", |
664 | skb_queue_len(&sock->tx_queue)); | |
665 | return -ENOBUFS; | |
666 | } | |
667 | ||
81ca7835 | 668 | msg_data = kmalloc(len, GFP_USER | __GFP_NOWARN); |
e65b0f46 SO |
669 | if (msg_data == NULL) |
670 | return -ENOMEM; | |
53a0ac2e | 671 | |
6ce8e9ce | 672 | if (memcpy_from_msg(msg_data, msg, len)) { |
427a2eb1 SO |
673 | kfree(msg_data); |
674 | return -EFAULT; | |
53a0ac2e SO |
675 | } |
676 | ||
e65b0f46 SO |
677 | remaining_len = len; |
678 | msg_ptr = msg_data; | |
679 | ||
0b23d666 | 680 | do { |
66cbfa10 | 681 | remote_miu = sock->remote_miu > LLCP_MAX_MIU ? |
11bfb1c4 | 682 | LLCP_DEFAULT_MIU : sock->remote_miu; |
66cbfa10 TE |
683 | |
684 | frag_len = min_t(size_t, remote_miu, remaining_len); | |
53a0ac2e | 685 | |
e65b0f46 SO |
686 | pr_debug("Fragment %zd bytes remaining %zd", |
687 | frag_len, remaining_len); | |
53a0ac2e | 688 | |
e65b0f46 SO |
689 | pdu = llcp_allocate_pdu(sock, LLCP_PDU_I, |
690 | frag_len + LLCP_SEQUENCE_SIZE); | |
43d53c29 SJ |
691 | if (pdu == NULL) { |
692 | kfree(msg_data); | |
e65b0f46 | 693 | return -ENOMEM; |
43d53c29 | 694 | } |
e65b0f46 SO |
695 | |
696 | skb_put(pdu, LLCP_SEQUENCE_SIZE); | |
697 | ||
0b23d666 | 698 | if (likely(frag_len > 0)) |
59ae1d12 | 699 | skb_put_data(pdu, msg_ptr, frag_len); |
e65b0f46 | 700 | |
bdbc59b3 | 701 | skb_queue_tail(&sock->tx_queue, pdu); |
e65b0f46 SO |
702 | |
703 | lock_sock(sk); | |
704 | ||
705 | nfc_llcp_queue_i_frames(sock); | |
706 | ||
707 | release_sock(sk); | |
708 | ||
709 | remaining_len -= frag_len; | |
b4838d12 | 710 | msg_ptr += frag_len; |
0b23d666 | 711 | } while (remaining_len > 0); |
53a0ac2e | 712 | |
e65b0f46 | 713 | kfree(msg_data); |
53a0ac2e | 714 | |
43472fff | 715 | return len; |
53a0ac2e | 716 | } |
d094afa1 | 717 | |
94f418a2 SO |
718 | int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap, |
719 | struct msghdr *msg, size_t len) | |
720 | { | |
721 | struct sk_buff *pdu; | |
722 | struct nfc_llcp_local *local; | |
723 | size_t frag_len = 0, remaining_len; | |
6e950fd2 | 724 | u8 *msg_ptr, *msg_data; |
66cbfa10 | 725 | u16 remote_miu; |
94f418a2 SO |
726 | int err; |
727 | ||
728 | pr_debug("Send UI frame len %zd\n", len); | |
729 | ||
730 | local = sock->local; | |
731 | if (local == NULL) | |
732 | return -ENODEV; | |
733 | ||
81ca7835 | 734 | msg_data = kmalloc(len, GFP_USER | __GFP_NOWARN); |
6e950fd2 SO |
735 | if (msg_data == NULL) |
736 | return -ENOMEM; | |
737 | ||
6ce8e9ce | 738 | if (memcpy_from_msg(msg_data, msg, len)) { |
6e950fd2 SO |
739 | kfree(msg_data); |
740 | return -EFAULT; | |
741 | } | |
742 | ||
94f418a2 | 743 | remaining_len = len; |
6e950fd2 | 744 | msg_ptr = msg_data; |
94f418a2 | 745 | |
0b23d666 | 746 | do { |
66cbfa10 TE |
747 | remote_miu = sock->remote_miu > LLCP_MAX_MIU ? |
748 | local->remote_miu : sock->remote_miu; | |
749 | ||
750 | frag_len = min_t(size_t, remote_miu, remaining_len); | |
94f418a2 SO |
751 | |
752 | pr_debug("Fragment %zd bytes remaining %zd", | |
753 | frag_len, remaining_len); | |
754 | ||
755 | pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, | |
756 | frag_len + LLCP_HEADER_SIZE, &err); | |
757 | if (pdu == NULL) { | |
758 | pr_err("Could not allocate PDU\n"); | |
759 | continue; | |
760 | } | |
761 | ||
762 | pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI); | |
763 | ||
0b23d666 | 764 | if (likely(frag_len > 0)) |
59ae1d12 | 765 | skb_put_data(pdu, msg_ptr, frag_len); |
94f418a2 SO |
766 | |
767 | /* No need to check for the peer RW for UI frames */ | |
768 | skb_queue_tail(&local->tx_queue, pdu); | |
769 | ||
770 | remaining_len -= frag_len; | |
771 | msg_ptr += frag_len; | |
0b23d666 | 772 | } while (remaining_len > 0); |
94f418a2 | 773 | |
6e950fd2 SO |
774 | kfree(msg_data); |
775 | ||
94f418a2 SO |
776 | return len; |
777 | } | |
778 | ||
d094afa1 SO |
779 | int nfc_llcp_send_rr(struct nfc_llcp_sock *sock) |
780 | { | |
781 | struct sk_buff *skb; | |
782 | struct nfc_llcp_local *local; | |
783 | ||
784 | pr_debug("Send rr nr %d\n", sock->recv_n); | |
785 | ||
786 | local = sock->local; | |
787 | if (local == NULL) | |
788 | return -ENODEV; | |
789 | ||
790 | skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE); | |
791 | if (skb == NULL) | |
792 | return -ENOMEM; | |
793 | ||
794 | skb_put(skb, LLCP_SEQUENCE_SIZE); | |
795 | ||
279cf174 | 796 | skb->data[2] = sock->recv_n; |
d094afa1 SO |
797 | |
798 | skb_queue_head(&local->tx_queue, skb); | |
799 | ||
800 | return 0; | |
801 | } |