Commit | Line | Data |
---|---|---|
1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
d646960f SO |
2 | /* |
3 | * Copyright (C) 2011 Intel Corporation. All rights reserved. | |
d646960f SO |
4 | */ |
5 | ||
6 | #define pr_fmt(fmt) "llcp: %s: " fmt, __func__ | |
7 | ||
8 | #include <linux/init.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/nfc.h> | |
12 | ||
13 | #include <net/nfc/nfc.h> | |
14 | ||
30cc4587 | 15 | #include "nfc.h" |
d646960f SO |
16 | #include "llcp.h" |
17 | ||
3df40eb3 | 18 | static const u8 llcp_tlv_length[LLCP_TLV_MAX] = { |
d646960f SO |
19 | 0, |
20 | 1, /* VERSION */ | |
21 | 2, /* MIUX */ | |
22 | 2, /* WKS */ | |
23 | 1, /* LTO */ | |
24 | 1, /* RW */ | |
25 | 0, /* SN */ | |
26 | 1, /* OPT */ | |
27 | 0, /* SDREQ */ | |
28 | 2, /* SDRES */ | |
29 | ||
30 | }; | |
31 | ||
3df40eb3 | 32 | static u8 llcp_tlv8(const u8 *tlv, u8 type) |
d646960f SO |
33 | { |
34 | if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) | |
35 | return 0; | |
36 | ||
37 | return tlv[2]; | |
38 | } | |
39 | ||
3df40eb3 | 40 | static u16 llcp_tlv16(const u8 *tlv, u8 type) |
d646960f SO |
41 | { |
42 | if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) | |
43 | return 0; | |
44 | ||
45 | return be16_to_cpu(*((__be16 *)(tlv + 2))); | |
46 | } | |
47 | ||
48 | ||
3df40eb3 | 49 | static u8 llcp_tlv_version(const u8 *tlv) |
d646960f SO |
50 | { |
51 | return llcp_tlv8(tlv, LLCP_TLV_VERSION); | |
52 | } | |
53 | ||
3df40eb3 | 54 | static u16 llcp_tlv_miux(const u8 *tlv) |
d646960f | 55 | { |
76762b73 | 56 | return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff; |
d646960f SO |
57 | } |
58 | ||
3df40eb3 | 59 | static u16 llcp_tlv_wks(const u8 *tlv) |
d646960f SO |
60 | { |
61 | return llcp_tlv16(tlv, LLCP_TLV_WKS); | |
62 | } | |
63 | ||
3df40eb3 | 64 | static u16 llcp_tlv_lto(const u8 *tlv) |
d646960f SO |
65 | { |
66 | return llcp_tlv8(tlv, LLCP_TLV_LTO); | |
67 | } | |
68 | ||
3df40eb3 | 69 | static u8 llcp_tlv_opt(const u8 *tlv) |
d646960f SO |
70 | { |
71 | return llcp_tlv8(tlv, LLCP_TLV_OPT); | |
72 | } | |
73 | ||
3df40eb3 | 74 | static u8 llcp_tlv_rw(const u8 *tlv) |
d646960f SO |
75 | { |
76 | return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf; | |
77 | } | |
78 | ||
3df40eb3 | 79 | u8 *nfc_llcp_build_tlv(u8 type, const u8 *value, u8 value_length, u8 *tlv_length) |
d646960f SO |
80 | { |
81 | u8 *tlv, length; | |
82 | ||
83 | pr_debug("type %d\n", type); | |
84 | ||
85 | if (type >= LLCP_TLV_MAX) | |
86 | return NULL; | |
87 | ||
88 | length = llcp_tlv_length[type]; | |
89 | if (length == 0 && value_length == 0) | |
90 | return NULL; | |
324b0af6 | 91 | else if (length == 0) |
d646960f SO |
92 | length = value_length; |
93 | ||
94 | *tlv_length = 2 + length; | |
95 | tlv = kzalloc(2 + length, GFP_KERNEL); | |
96 | if (tlv == NULL) | |
97 | return tlv; | |
98 | ||
99 | tlv[0] = type; | |
100 | tlv[1] = length; | |
101 | memcpy(tlv + 2, value, length); | |
102 | ||
103 | return tlv; | |
104 | } | |
105 | ||
e0ae7bac TE |
106 | struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap) |
107 | { | |
108 | struct nfc_llcp_sdp_tlv *sdres; | |
109 | u8 value[2]; | |
110 | ||
111 | sdres = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL); | |
112 | if (sdres == NULL) | |
113 | return NULL; | |
114 | ||
115 | value[0] = tid; | |
116 | value[1] = sap; | |
117 | ||
118 | sdres->tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, value, 2, | |
119 | &sdres->tlv_len); | |
120 | if (sdres->tlv == NULL) { | |
121 | kfree(sdres); | |
122 | return NULL; | |
123 | } | |
124 | ||
125 | sdres->tid = tid; | |
126 | sdres->sap = sap; | |
127 | ||
128 | INIT_HLIST_NODE(&sdres->node); | |
129 | ||
130 | return sdres; | |
131 | } | |
132 | ||
3df40eb3 | 133 | struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, const char *uri, |
d9b8d8e1 TE |
134 | size_t uri_len) |
135 | { | |
136 | struct nfc_llcp_sdp_tlv *sdreq; | |
137 | ||
138 | pr_debug("uri: %s, len: %zu\n", uri, uri_len); | |
139 | ||
fe9c8426 KC |
140 | /* sdreq->tlv_len is u8, takes uri_len, + 3 for header, + 1 for NULL */ |
141 | if (WARN_ON_ONCE(uri_len > U8_MAX - 4)) | |
142 | return NULL; | |
143 | ||
d9b8d8e1 TE |
144 | sdreq = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL); |
145 | if (sdreq == NULL) | |
146 | return NULL; | |
147 | ||
148 | sdreq->tlv_len = uri_len + 3; | |
149 | ||
150 | if (uri[uri_len - 1] == 0) | |
151 | sdreq->tlv_len--; | |
152 | ||
153 | sdreq->tlv = kzalloc(sdreq->tlv_len + 1, GFP_KERNEL); | |
154 | if (sdreq->tlv == NULL) { | |
155 | kfree(sdreq); | |
156 | return NULL; | |
157 | } | |
158 | ||
159 | sdreq->tlv[0] = LLCP_TLV_SDREQ; | |
160 | sdreq->tlv[1] = sdreq->tlv_len - 2; | |
161 | sdreq->tlv[2] = tid; | |
162 | ||
163 | sdreq->tid = tid; | |
164 | sdreq->uri = sdreq->tlv + 3; | |
165 | memcpy(sdreq->uri, uri, uri_len); | |
166 | ||
40213fa8 TE |
167 | sdreq->time = jiffies; |
168 | ||
d9b8d8e1 TE |
169 | INIT_HLIST_NODE(&sdreq->node); |
170 | ||
171 | return sdreq; | |
172 | } | |
173 | ||
e0ae7bac TE |
174 | void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp) |
175 | { | |
176 | kfree(sdp->tlv); | |
177 | kfree(sdp); | |
178 | } | |
179 | ||
d9b8d8e1 TE |
180 | void nfc_llcp_free_sdp_tlv_list(struct hlist_head *head) |
181 | { | |
182 | struct nfc_llcp_sdp_tlv *sdp; | |
183 | struct hlist_node *n; | |
184 | ||
185 | hlist_for_each_entry_safe(sdp, n, head, node) { | |
186 | hlist_del(&sdp->node); | |
187 | ||
188 | nfc_llcp_free_sdp_tlv(sdp); | |
189 | } | |
190 | } | |
191 | ||
7a06e586 | 192 | int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local, |
3df40eb3 | 193 | const u8 *tlv_array, u16 tlv_array_len) |
d646960f | 194 | { |
3df40eb3 KK |
195 | const u8 *tlv = tlv_array; |
196 | u8 type, length, offset = 0; | |
d646960f SO |
197 | |
198 | pr_debug("TLV array length %d\n", tlv_array_len); | |
199 | ||
200 | if (local == NULL) | |
201 | return -ENODEV; | |
202 | ||
203 | while (offset < tlv_array_len) { | |
204 | type = tlv[0]; | |
205 | length = tlv[1]; | |
206 | ||
207 | pr_debug("type 0x%x length %d\n", type, length); | |
208 | ||
209 | switch (type) { | |
210 | case LLCP_TLV_VERSION: | |
211 | local->remote_version = llcp_tlv_version(tlv); | |
212 | break; | |
213 | case LLCP_TLV_MIUX: | |
214 | local->remote_miu = llcp_tlv_miux(tlv) + 128; | |
215 | break; | |
216 | case LLCP_TLV_WKS: | |
217 | local->remote_wks = llcp_tlv_wks(tlv); | |
218 | break; | |
219 | case LLCP_TLV_LTO: | |
220 | local->remote_lto = llcp_tlv_lto(tlv) * 10; | |
221 | break; | |
222 | case LLCP_TLV_OPT: | |
223 | local->remote_opt = llcp_tlv_opt(tlv); | |
224 | break; | |
7a06e586 SO |
225 | default: |
226 | pr_err("Invalid gt tlv value 0x%x\n", type); | |
227 | break; | |
228 | } | |
229 | ||
230 | offset += length + 2; | |
231 | tlv += length + 2; | |
232 | } | |
233 | ||
234 | pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n", | |
235 | local->remote_version, local->remote_miu, | |
236 | local->remote_lto, local->remote_opt, | |
237 | local->remote_wks); | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock, | |
3df40eb3 | 243 | const u8 *tlv_array, u16 tlv_array_len) |
7a06e586 | 244 | { |
3df40eb3 KK |
245 | const u8 *tlv = tlv_array; |
246 | u8 type, length, offset = 0; | |
7a06e586 SO |
247 | |
248 | pr_debug("TLV array length %d\n", tlv_array_len); | |
249 | ||
250 | if (sock == NULL) | |
251 | return -ENOTCONN; | |
252 | ||
253 | while (offset < tlv_array_len) { | |
254 | type = tlv[0]; | |
255 | length = tlv[1]; | |
256 | ||
257 | pr_debug("type 0x%x length %d\n", type, length); | |
258 | ||
259 | switch (type) { | |
93d7e490 | 260 | case LLCP_TLV_MIUX: |
e4306bec | 261 | sock->remote_miu = llcp_tlv_miux(tlv) + 128; |
93d7e490 | 262 | break; |
d646960f | 263 | case LLCP_TLV_RW: |
e4306bec | 264 | sock->remote_rw = llcp_tlv_rw(tlv); |
d646960f | 265 | break; |
9dda50f4 SO |
266 | case LLCP_TLV_SN: |
267 | break; | |
d646960f SO |
268 | default: |
269 | pr_err("Invalid gt tlv value 0x%x\n", type); | |
270 | break; | |
271 | } | |
272 | ||
273 | offset += length + 2; | |
274 | tlv += length + 2; | |
275 | } | |
276 | ||
e4306bec SO |
277 | pr_debug("sock %p rw %d miu %d\n", sock, |
278 | sock->remote_rw, sock->remote_miu); | |
d646960f SO |
279 | |
280 | return 0; | |
281 | } | |
282 | ||
283 | static struct sk_buff *llcp_add_header(struct sk_buff *pdu, | |
427a2eb1 | 284 | u8 dsap, u8 ssap, u8 ptype) |
d646960f SO |
285 | { |
286 | u8 header[2]; | |
287 | ||
288 | pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); | |
289 | ||
290 | header[0] = (u8)((dsap << 2) | (ptype >> 2)); | |
291 | header[1] = (u8)((ptype << 6) | ssap); | |
292 | ||
293 | pr_debug("header 0x%x 0x%x\n", header[0], header[1]); | |
294 | ||
59ae1d12 | 295 | skb_put_data(pdu, header, LLCP_HEADER_SIZE); |
d646960f SO |
296 | |
297 | return pdu; | |
298 | } | |
299 | ||
3df40eb3 | 300 | static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, const u8 *tlv, |
427a2eb1 | 301 | u8 tlv_length) |
d646960f SO |
302 | { |
303 | /* XXX Add an skb length check */ | |
304 | ||
305 | if (tlv == NULL) | |
306 | return NULL; | |
307 | ||
59ae1d12 | 308 | skb_put_data(pdu, tlv, tlv_length); |
d646960f SO |
309 | |
310 | return pdu; | |
311 | } | |
312 | ||
313 | static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock, | |
427a2eb1 | 314 | u8 cmd, u16 size) |
d646960f SO |
315 | { |
316 | struct sk_buff *skb; | |
317 | int err; | |
318 | ||
319 | if (sock->ssap == 0) | |
320 | return NULL; | |
321 | ||
322 | skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, | |
427a2eb1 | 323 | size + LLCP_HEADER_SIZE, &err); |
d646960f SO |
324 | if (skb == NULL) { |
325 | pr_err("Could not allocate PDU\n"); | |
326 | return NULL; | |
327 | } | |
328 | ||
329 | skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd); | |
330 | ||
331 | return skb; | |
332 | } | |
333 | ||
58e3dd15 | 334 | int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock) |
d646960f SO |
335 | { |
336 | struct sk_buff *skb; | |
337 | struct nfc_dev *dev; | |
338 | struct nfc_llcp_local *local; | |
d646960f SO |
339 | |
340 | pr_debug("Sending DISC\n"); | |
341 | ||
342 | local = sock->local; | |
343 | if (local == NULL) | |
344 | return -ENODEV; | |
345 | ||
346 | dev = sock->dev; | |
347 | if (dev == NULL) | |
348 | return -ENODEV; | |
349 | ||
92223906 | 350 | skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0); |
d646960f SO |
351 | if (skb == NULL) |
352 | return -ENOMEM; | |
353 | ||
d646960f SO |
354 | skb_queue_tail(&local->tx_queue, skb); |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
359 | int nfc_llcp_send_symm(struct nfc_dev *dev) | |
360 | { | |
361 | struct sk_buff *skb; | |
362 | struct nfc_llcp_local *local; | |
363 | u16 size = 0; | |
364 | ||
365 | pr_debug("Sending SYMM\n"); | |
366 | ||
367 | local = nfc_llcp_find_local(dev); | |
368 | if (local == NULL) | |
369 | return -ENODEV; | |
370 | ||
371 | size += LLCP_HEADER_SIZE; | |
372 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
373 | ||
374 | skb = alloc_skb(size, GFP_KERNEL); | |
375 | if (skb == NULL) | |
376 | return -ENOMEM; | |
377 | ||
378 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
379 | ||
380 | skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM); | |
381 | ||
2c2d45bd TE |
382 | __net_timestamp(skb); |
383 | ||
57be1f3f | 384 | nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_TX); |
4463523b | 385 | |
d646960f | 386 | return nfc_data_exchange(dev, local->target_idx, skb, |
427a2eb1 | 387 | nfc_llcp_recv, local); |
d646960f SO |
388 | } |
389 | ||
390 | int nfc_llcp_send_connect(struct nfc_llcp_sock *sock) | |
391 | { | |
392 | struct nfc_llcp_local *local; | |
393 | struct sk_buff *skb; | |
3df40eb3 KK |
394 | const u8 *service_name_tlv = NULL; |
395 | const u8 *miux_tlv = NULL; | |
396 | const u8 *rw_tlv = NULL; | |
397 | u8 service_name_tlv_length, miux_tlv_length, rw_tlv_length, rw; | |
d646960f | 398 | int err; |
e5b53c0a CR |
399 | u16 size = 0; |
400 | __be16 miux; | |
d646960f SO |
401 | |
402 | pr_debug("Sending CONNECT\n"); | |
403 | ||
404 | local = sock->local; | |
405 | if (local == NULL) | |
406 | return -ENODEV; | |
407 | ||
408 | if (sock->service_name != NULL) { | |
409 | service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN, | |
427a2eb1 SO |
410 | sock->service_name, |
411 | sock->service_name_len, | |
412 | &service_name_tlv_length); | |
58bdd544 Y |
413 | if (!service_name_tlv) { |
414 | err = -ENOMEM; | |
415 | goto error_tlv; | |
416 | } | |
d646960f SO |
417 | size += service_name_tlv_length; |
418 | } | |
419 | ||
06d44f80 | 420 | /* If the socket parameters are not set, use the local ones */ |
5eef6669 SO |
421 | miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ? |
422 | local->miux : sock->miux; | |
06d44f80 SO |
423 | rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw; |
424 | ||
425 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, | |
427a2eb1 | 426 | &miux_tlv_length); |
58bdd544 Y |
427 | if (!miux_tlv) { |
428 | err = -ENOMEM; | |
429 | goto error_tlv; | |
430 | } | |
eda21f16 SO |
431 | size += miux_tlv_length; |
432 | ||
06d44f80 | 433 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); |
58bdd544 Y |
434 | if (!rw_tlv) { |
435 | err = -ENOMEM; | |
436 | goto error_tlv; | |
437 | } | |
eda21f16 SO |
438 | size += rw_tlv_length; |
439 | ||
d646960f SO |
440 | pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len); |
441 | ||
442 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size); | |
443 | if (skb == NULL) { | |
444 | err = -ENOMEM; | |
445 | goto error_tlv; | |
446 | } | |
447 | ||
de9e5aeb TE |
448 | llcp_add_tlv(skb, service_name_tlv, service_name_tlv_length); |
449 | llcp_add_tlv(skb, miux_tlv, miux_tlv_length); | |
450 | llcp_add_tlv(skb, rw_tlv, rw_tlv_length); | |
eda21f16 | 451 | |
d646960f SO |
452 | skb_queue_tail(&local->tx_queue, skb); |
453 | ||
256f3ee3 | 454 | err = 0; |
d646960f SO |
455 | |
456 | error_tlv: | |
256f3ee3 TE |
457 | if (err) |
458 | pr_err("error %d\n", err); | |
d646960f SO |
459 | |
460 | kfree(service_name_tlv); | |
eda21f16 SO |
461 | kfree(miux_tlv); |
462 | kfree(rw_tlv); | |
d646960f SO |
463 | |
464 | return err; | |
465 | } | |
466 | ||
467 | int nfc_llcp_send_cc(struct nfc_llcp_sock *sock) | |
468 | { | |
469 | struct nfc_llcp_local *local; | |
470 | struct sk_buff *skb; | |
3df40eb3 KK |
471 | const u8 *miux_tlv = NULL; |
472 | const u8 *rw_tlv = NULL; | |
473 | u8 miux_tlv_length, rw_tlv_length, rw; | |
eda21f16 | 474 | int err; |
e5b53c0a CR |
475 | u16 size = 0; |
476 | __be16 miux; | |
d646960f SO |
477 | |
478 | pr_debug("Sending CC\n"); | |
479 | ||
480 | local = sock->local; | |
481 | if (local == NULL) | |
482 | return -ENODEV; | |
483 | ||
06d44f80 | 484 | /* If the socket parameters are not set, use the local ones */ |
5eef6669 SO |
485 | miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ? |
486 | local->miux : sock->miux; | |
06d44f80 SO |
487 | rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw; |
488 | ||
489 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, | |
427a2eb1 | 490 | &miux_tlv_length); |
58bdd544 Y |
491 | if (!miux_tlv) { |
492 | err = -ENOMEM; | |
493 | goto error_tlv; | |
494 | } | |
eda21f16 SO |
495 | size += miux_tlv_length; |
496 | ||
06d44f80 | 497 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); |
58bdd544 Y |
498 | if (!rw_tlv) { |
499 | err = -ENOMEM; | |
500 | goto error_tlv; | |
501 | } | |
eda21f16 SO |
502 | size += rw_tlv_length; |
503 | ||
504 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size); | |
505 | if (skb == NULL) { | |
506 | err = -ENOMEM; | |
507 | goto error_tlv; | |
508 | } | |
509 | ||
de9e5aeb TE |
510 | llcp_add_tlv(skb, miux_tlv, miux_tlv_length); |
511 | llcp_add_tlv(skb, rw_tlv, rw_tlv_length); | |
d646960f SO |
512 | |
513 | skb_queue_tail(&local->tx_queue, skb); | |
514 | ||
256f3ee3 | 515 | err = 0; |
eda21f16 SO |
516 | |
517 | error_tlv: | |
256f3ee3 TE |
518 | if (err) |
519 | pr_err("error %d\n", err); | |
eda21f16 SO |
520 | |
521 | kfree(miux_tlv); | |
522 | kfree(rw_tlv); | |
523 | ||
524 | return err; | |
d646960f SO |
525 | } |
526 | ||
e0ae7bac TE |
527 | static struct sk_buff *nfc_llcp_allocate_snl(struct nfc_llcp_local *local, |
528 | size_t tlv_length) | |
c43bb03d SO |
529 | { |
530 | struct sk_buff *skb; | |
531 | struct nfc_dev *dev; | |
c43bb03d SO |
532 | u16 size = 0; |
533 | ||
c43bb03d | 534 | if (local == NULL) |
e0ae7bac | 535 | return ERR_PTR(-ENODEV); |
c43bb03d SO |
536 | |
537 | dev = local->dev; | |
538 | if (dev == NULL) | |
e0ae7bac | 539 | return ERR_PTR(-ENODEV); |
c43bb03d SO |
540 | |
541 | size += LLCP_HEADER_SIZE; | |
542 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
e0ae7bac | 543 | size += tlv_length; |
c43bb03d SO |
544 | |
545 | skb = alloc_skb(size, GFP_KERNEL); | |
e0ae7bac TE |
546 | if (skb == NULL) |
547 | return ERR_PTR(-ENOMEM); | |
c43bb03d SO |
548 | |
549 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
550 | ||
551 | skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL); | |
552 | ||
e0ae7bac TE |
553 | return skb; |
554 | } | |
c43bb03d | 555 | |
e0ae7bac TE |
556 | int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local, |
557 | struct hlist_head *tlv_list, size_t tlvs_len) | |
558 | { | |
559 | struct nfc_llcp_sdp_tlv *sdp; | |
560 | struct hlist_node *n; | |
561 | struct sk_buff *skb; | |
562 | ||
563 | skb = nfc_llcp_allocate_snl(local, tlvs_len); | |
564 | if (IS_ERR(skb)) | |
565 | return PTR_ERR(skb); | |
566 | ||
567 | hlist_for_each_entry_safe(sdp, n, tlv_list, node) { | |
59ae1d12 | 568 | skb_put_data(skb, sdp->tlv, sdp->tlv_len); |
c43bb03d | 569 | |
e0ae7bac TE |
570 | hlist_del(&sdp->node); |
571 | ||
572 | nfc_llcp_free_sdp_tlv(sdp); | |
573 | } | |
574 | ||
575 | skb_queue_tail(&local->tx_queue, skb); | |
c43bb03d SO |
576 | |
577 | return 0; | |
578 | } | |
579 | ||
d9b8d8e1 TE |
580 | int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local, |
581 | struct hlist_head *tlv_list, size_t tlvs_len) | |
582 | { | |
583 | struct nfc_llcp_sdp_tlv *sdreq; | |
584 | struct hlist_node *n; | |
585 | struct sk_buff *skb; | |
586 | ||
587 | skb = nfc_llcp_allocate_snl(local, tlvs_len); | |
588 | if (IS_ERR(skb)) | |
589 | return PTR_ERR(skb); | |
590 | ||
591 | mutex_lock(&local->sdreq_lock); | |
592 | ||
40213fa8 TE |
593 | if (hlist_empty(&local->pending_sdreqs)) |
594 | mod_timer(&local->sdreq_timer, | |
595 | jiffies + msecs_to_jiffies(3 * local->remote_lto)); | |
596 | ||
d9b8d8e1 TE |
597 | hlist_for_each_entry_safe(sdreq, n, tlv_list, node) { |
598 | pr_debug("tid %d for %s\n", sdreq->tid, sdreq->uri); | |
599 | ||
59ae1d12 | 600 | skb_put_data(skb, sdreq->tlv, sdreq->tlv_len); |
d9b8d8e1 TE |
601 | |
602 | hlist_del(&sdreq->node); | |
603 | ||
604 | hlist_add_head(&sdreq->node, &local->pending_sdreqs); | |
605 | } | |
606 | ||
607 | mutex_unlock(&local->sdreq_lock); | |
608 | ||
609 | skb_queue_tail(&local->tx_queue, skb); | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
d646960f SO |
614 | int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason) |
615 | { | |
616 | struct sk_buff *skb; | |
617 | struct nfc_dev *dev; | |
618 | u16 size = 1; /* Reason code */ | |
619 | ||
620 | pr_debug("Sending DM reason 0x%x\n", reason); | |
621 | ||
622 | if (local == NULL) | |
623 | return -ENODEV; | |
624 | ||
625 | dev = local->dev; | |
626 | if (dev == NULL) | |
627 | return -ENODEV; | |
628 | ||
629 | size += LLCP_HEADER_SIZE; | |
630 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
631 | ||
632 | skb = alloc_skb(size, GFP_KERNEL); | |
633 | if (skb == NULL) | |
634 | return -ENOMEM; | |
635 | ||
636 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
637 | ||
ffc29315 | 638 | skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM); |
d646960f | 639 | |
59ae1d12 | 640 | skb_put_data(skb, &reason, 1); |
d646960f SO |
641 | |
642 | skb_queue_head(&local->tx_queue, skb); | |
643 | ||
644 | return 0; | |
645 | } | |
646 | ||
53a0ac2e | 647 | int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock, |
427a2eb1 | 648 | struct msghdr *msg, size_t len) |
53a0ac2e SO |
649 | { |
650 | struct sk_buff *pdu; | |
e65b0f46 SO |
651 | struct sock *sk = &sock->sk; |
652 | struct nfc_llcp_local *local; | |
653 | size_t frag_len = 0, remaining_len; | |
654 | u8 *msg_data, *msg_ptr; | |
66cbfa10 | 655 | u16 remote_miu; |
53a0ac2e | 656 | |
e65b0f46 | 657 | pr_debug("Send I frame len %zd\n", len); |
53a0ac2e | 658 | |
e65b0f46 SO |
659 | local = sock->local; |
660 | if (local == NULL) | |
661 | return -ENODEV; | |
53a0ac2e | 662 | |
dd2bf43f SO |
663 | /* Remote is ready but has not acknowledged our frames */ |
664 | if((sock->remote_ready && | |
e4306bec SO |
665 | skb_queue_len(&sock->tx_pending_queue) >= sock->remote_rw && |
666 | skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) { | |
dd2bf43f SO |
667 | pr_err("Pending queue is full %d frames\n", |
668 | skb_queue_len(&sock->tx_pending_queue)); | |
669 | return -ENOBUFS; | |
670 | } | |
671 | ||
672 | /* Remote is not ready and we've been queueing enough frames */ | |
673 | if ((!sock->remote_ready && | |
e4306bec | 674 | skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) { |
dd2bf43f SO |
675 | pr_err("Tx queue is full %d frames\n", |
676 | skb_queue_len(&sock->tx_queue)); | |
677 | return -ENOBUFS; | |
678 | } | |
679 | ||
81ca7835 | 680 | msg_data = kmalloc(len, GFP_USER | __GFP_NOWARN); |
e65b0f46 SO |
681 | if (msg_data == NULL) |
682 | return -ENOMEM; | |
53a0ac2e | 683 | |
6ce8e9ce | 684 | if (memcpy_from_msg(msg_data, msg, len)) { |
427a2eb1 SO |
685 | kfree(msg_data); |
686 | return -EFAULT; | |
53a0ac2e SO |
687 | } |
688 | ||
e65b0f46 SO |
689 | remaining_len = len; |
690 | msg_ptr = msg_data; | |
691 | ||
0b23d666 | 692 | do { |
66cbfa10 | 693 | remote_miu = sock->remote_miu > LLCP_MAX_MIU ? |
11bfb1c4 | 694 | LLCP_DEFAULT_MIU : sock->remote_miu; |
66cbfa10 TE |
695 | |
696 | frag_len = min_t(size_t, remote_miu, remaining_len); | |
53a0ac2e | 697 | |
e65b0f46 SO |
698 | pr_debug("Fragment %zd bytes remaining %zd", |
699 | frag_len, remaining_len); | |
53a0ac2e | 700 | |
e65b0f46 SO |
701 | pdu = llcp_allocate_pdu(sock, LLCP_PDU_I, |
702 | frag_len + LLCP_SEQUENCE_SIZE); | |
43d53c29 SJ |
703 | if (pdu == NULL) { |
704 | kfree(msg_data); | |
e65b0f46 | 705 | return -ENOMEM; |
43d53c29 | 706 | } |
e65b0f46 SO |
707 | |
708 | skb_put(pdu, LLCP_SEQUENCE_SIZE); | |
709 | ||
0b23d666 | 710 | if (likely(frag_len > 0)) |
59ae1d12 | 711 | skb_put_data(pdu, msg_ptr, frag_len); |
e65b0f46 | 712 | |
bdbc59b3 | 713 | skb_queue_tail(&sock->tx_queue, pdu); |
e65b0f46 SO |
714 | |
715 | lock_sock(sk); | |
716 | ||
717 | nfc_llcp_queue_i_frames(sock); | |
718 | ||
719 | release_sock(sk); | |
720 | ||
721 | remaining_len -= frag_len; | |
b4838d12 | 722 | msg_ptr += frag_len; |
0b23d666 | 723 | } while (remaining_len > 0); |
53a0ac2e | 724 | |
e65b0f46 | 725 | kfree(msg_data); |
53a0ac2e | 726 | |
43472fff | 727 | return len; |
53a0ac2e | 728 | } |
d094afa1 | 729 | |
94f418a2 SO |
730 | int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap, |
731 | struct msghdr *msg, size_t len) | |
732 | { | |
733 | struct sk_buff *pdu; | |
734 | struct nfc_llcp_local *local; | |
735 | size_t frag_len = 0, remaining_len; | |
6e950fd2 | 736 | u8 *msg_ptr, *msg_data; |
66cbfa10 | 737 | u16 remote_miu; |
94f418a2 SO |
738 | int err; |
739 | ||
740 | pr_debug("Send UI frame len %zd\n", len); | |
741 | ||
742 | local = sock->local; | |
743 | if (local == NULL) | |
744 | return -ENODEV; | |
745 | ||
81ca7835 | 746 | msg_data = kmalloc(len, GFP_USER | __GFP_NOWARN); |
6e950fd2 SO |
747 | if (msg_data == NULL) |
748 | return -ENOMEM; | |
749 | ||
6ce8e9ce | 750 | if (memcpy_from_msg(msg_data, msg, len)) { |
6e950fd2 SO |
751 | kfree(msg_data); |
752 | return -EFAULT; | |
753 | } | |
754 | ||
94f418a2 | 755 | remaining_len = len; |
6e950fd2 | 756 | msg_ptr = msg_data; |
94f418a2 | 757 | |
0b23d666 | 758 | do { |
66cbfa10 TE |
759 | remote_miu = sock->remote_miu > LLCP_MAX_MIU ? |
760 | local->remote_miu : sock->remote_miu; | |
761 | ||
762 | frag_len = min_t(size_t, remote_miu, remaining_len); | |
94f418a2 SO |
763 | |
764 | pr_debug("Fragment %zd bytes remaining %zd", | |
765 | frag_len, remaining_len); | |
766 | ||
3bc53be9 | 767 | pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, 0, |
94f418a2 SO |
768 | frag_len + LLCP_HEADER_SIZE, &err); |
769 | if (pdu == NULL) { | |
3bc53be9 TH |
770 | pr_err("Could not allocate PDU (error=%d)\n", err); |
771 | len -= remaining_len; | |
772 | if (len == 0) | |
773 | len = err; | |
774 | break; | |
94f418a2 SO |
775 | } |
776 | ||
777 | pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI); | |
778 | ||
0b23d666 | 779 | if (likely(frag_len > 0)) |
59ae1d12 | 780 | skb_put_data(pdu, msg_ptr, frag_len); |
94f418a2 SO |
781 | |
782 | /* No need to check for the peer RW for UI frames */ | |
783 | skb_queue_tail(&local->tx_queue, pdu); | |
784 | ||
785 | remaining_len -= frag_len; | |
786 | msg_ptr += frag_len; | |
0b23d666 | 787 | } while (remaining_len > 0); |
94f418a2 | 788 | |
6e950fd2 SO |
789 | kfree(msg_data); |
790 | ||
94f418a2 SO |
791 | return len; |
792 | } | |
793 | ||
d094afa1 SO |
794 | int nfc_llcp_send_rr(struct nfc_llcp_sock *sock) |
795 | { | |
796 | struct sk_buff *skb; | |
797 | struct nfc_llcp_local *local; | |
798 | ||
799 | pr_debug("Send rr nr %d\n", sock->recv_n); | |
800 | ||
801 | local = sock->local; | |
802 | if (local == NULL) | |
803 | return -ENODEV; | |
804 | ||
805 | skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE); | |
806 | if (skb == NULL) | |
807 | return -ENOMEM; | |
808 | ||
809 | skb_put(skb, LLCP_SEQUENCE_SIZE); | |
810 | ||
279cf174 | 811 | skb->data[2] = sock->recv_n; |
d094afa1 SO |
812 | |
813 | skb_queue_head(&local->tx_queue, skb); | |
814 | ||
815 | return 0; | |
816 | } |