Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / p2p / p2p_sd.c
CommitLineData
4781064b
JM
1/*
2 * Wi-Fi Direct - P2P service discovery
3 * Copyright (c) 2009, Atheros Communications
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "includes.h"
10
11#include "common.h"
12#include "common/ieee802_11_defs.h"
13#include "common/gas.h"
14#include "p2p_i.h"
15#include "p2p.h"
16
17
18#ifdef CONFIG_WIFI_DISPLAY
19static int wfd_wsd_supported(struct wpabuf *wfd)
20{
21 const u8 *pos, *end;
22 u8 subelem;
23 u16 len;
24
25 if (wfd == NULL)
26 return 0;
27
28 pos = wpabuf_head(wfd);
29 end = pos + wpabuf_len(wfd);
30
31 while (pos + 3 <= end) {
32 subelem = *pos++;
33 len = WPA_GET_BE16(pos);
34 pos += 2;
35 if (pos + len > end)
36 break;
37
38 if (subelem == WFD_SUBELEM_DEVICE_INFO && len >= 6) {
39 u16 info = WPA_GET_BE16(pos);
40 return !!(info & 0x0040);
41 }
42
43 pos += len;
44 }
45
46 return 0;
47}
48#endif /* CONFIG_WIFI_DISPLAY */
49
50struct p2p_sd_query * p2p_pending_sd_req(struct p2p_data *p2p,
51 struct p2p_device *dev)
52{
53 struct p2p_sd_query *q;
54 int wsd = 0;
55
56 if (!(dev->info.dev_capab & P2P_DEV_CAPAB_SERVICE_DISCOVERY))
57 return NULL; /* peer does not support SD */
58#ifdef CONFIG_WIFI_DISPLAY
59 if (wfd_wsd_supported(dev->info.wfd_subelems))
60 wsd = 1;
61#endif /* CONFIG_WIFI_DISPLAY */
62
63 for (q = p2p->sd_queries; q; q = q->next) {
64 /* Use WSD only if the peer indicates support or it */
65 if (q->wsd && !wsd)
66 continue;
67 if (q->for_all_peers && !(dev->flags & P2P_DEV_SD_INFO))
68 return q;
69 if (!q->for_all_peers &&
70 os_memcmp(q->peer, dev->info.p2p_device_addr, ETH_ALEN) ==
71 0)
72 return q;
73 }
74
75 return NULL;
76}
77
78
79static int p2p_unlink_sd_query(struct p2p_data *p2p,
80 struct p2p_sd_query *query)
81{
82 struct p2p_sd_query *q, *prev;
83 q = p2p->sd_queries;
84 prev = NULL;
85 while (q) {
86 if (q == query) {
87 if (prev)
88 prev->next = q->next;
89 else
90 p2p->sd_queries = q->next;
91 if (p2p->sd_query == query)
92 p2p->sd_query = NULL;
93 return 1;
94 }
95 prev = q;
96 q = q->next;
97 }
98 return 0;
99}
100
101
102static void p2p_free_sd_query(struct p2p_sd_query *q)
103{
104 if (q == NULL)
105 return;
106 wpabuf_free(q->tlvs);
107 os_free(q);
108}
109
110
111void p2p_free_sd_queries(struct p2p_data *p2p)
112{
113 struct p2p_sd_query *q, *prev;
114 q = p2p->sd_queries;
115 p2p->sd_queries = NULL;
116 while (q) {
117 prev = q;
118 q = q->next;
119 p2p_free_sd_query(prev);
120 }
121}
122
123
124static struct wpabuf * p2p_build_sd_query(u16 update_indic,
125 struct wpabuf *tlvs)
126{
127 struct wpabuf *buf;
128 u8 *len_pos;
129
130 buf = gas_anqp_build_initial_req(0, 100 + wpabuf_len(tlvs));
131 if (buf == NULL)
132 return NULL;
133
134 /* ANQP Query Request Frame */
135 len_pos = gas_anqp_add_element(buf, ANQP_VENDOR_SPECIFIC);
136 wpabuf_put_be24(buf, OUI_WFA);
137 wpabuf_put_u8(buf, P2P_OUI_TYPE);
138 wpabuf_put_le16(buf, update_indic); /* Service Update Indicator */
139 wpabuf_put_buf(buf, tlvs);
140 gas_anqp_set_element_len(buf, len_pos);
141
142 gas_anqp_set_len(buf);
143
144 return buf;
145}
146
147
148static void p2p_send_gas_comeback_req(struct p2p_data *p2p, const u8 *dst,
149 u8 dialog_token, int freq)
150{
151 struct wpabuf *req;
152
153 req = gas_build_comeback_req(dialog_token);
154 if (req == NULL)
155 return;
156
157 p2p->pending_action_state = P2P_NO_PENDING_ACTION;
158 if (p2p_send_action(p2p, freq, dst, p2p->cfg->dev_addr, dst,
159 wpabuf_head(req), wpabuf_len(req), 200) < 0)
160 p2p_dbg(p2p, "Failed to send Action frame");
161
162 wpabuf_free(req);
163}
164
165
166static struct wpabuf * p2p_build_sd_response(u8 dialog_token, u16 status_code,
167 u16 comeback_delay,
168 u16 update_indic,
169 const struct wpabuf *tlvs)
170{
171 struct wpabuf *buf;
172 u8 *len_pos;
173
174 buf = gas_anqp_build_initial_resp(dialog_token, status_code,
175 comeback_delay,
176 100 + (tlvs ? wpabuf_len(tlvs) : 0));
177 if (buf == NULL)
178 return NULL;
179
180 if (tlvs) {
181 /* ANQP Query Response Frame */
182 len_pos = gas_anqp_add_element(buf, ANQP_VENDOR_SPECIFIC);
183 wpabuf_put_be24(buf, OUI_WFA);
184 wpabuf_put_u8(buf, P2P_OUI_TYPE);
185 /* Service Update Indicator */
186 wpabuf_put_le16(buf, update_indic);
187 wpabuf_put_buf(buf, tlvs);
188 gas_anqp_set_element_len(buf, len_pos);
189 }
190
191 gas_anqp_set_len(buf);
192
193 return buf;
194}
195
196
197static struct wpabuf * p2p_build_gas_comeback_resp(u8 dialog_token,
198 u16 status_code,
199 u16 update_indic,
200 const u8 *data, size_t len,
201 u8 frag_id, u8 more,
202 u16 total_len)
203{
204 struct wpabuf *buf;
205
206 buf = gas_anqp_build_comeback_resp(dialog_token, status_code, frag_id,
207 more, 0, 100 + len);
208 if (buf == NULL)
209 return NULL;
210
211 if (frag_id == 0) {
212 /* ANQP Query Response Frame */
213 wpabuf_put_le16(buf, ANQP_VENDOR_SPECIFIC); /* Info ID */
214 wpabuf_put_le16(buf, 3 + 1 + 2 + total_len);
215 wpabuf_put_be24(buf, OUI_WFA);
216 wpabuf_put_u8(buf, P2P_OUI_TYPE);
217 /* Service Update Indicator */
218 wpabuf_put_le16(buf, update_indic);
219 }
220
221 wpabuf_put_data(buf, data, len);
222 gas_anqp_set_len(buf);
223
224 return buf;
225}
226
227
228int p2p_start_sd(struct p2p_data *p2p, struct p2p_device *dev)
229{
230 struct wpabuf *req;
231 int ret = 0;
232 struct p2p_sd_query *query;
233 int freq;
234
235 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
236 if (freq <= 0) {
237 p2p_dbg(p2p, "No Listen/Operating frequency known for the peer "
238 MACSTR " to send SD Request",
239 MAC2STR(dev->info.p2p_device_addr));
240 return -1;
241 }
242
243 query = p2p_pending_sd_req(p2p, dev);
244 if (query == NULL)
245 return -1;
246
247 p2p_dbg(p2p, "Start Service Discovery with " MACSTR,
248 MAC2STR(dev->info.p2p_device_addr));
249
250 req = p2p_build_sd_query(p2p->srv_update_indic, query->tlvs);
251 if (req == NULL)
252 return -1;
253
254 p2p->sd_peer = dev;
255 p2p->sd_query = query;
256 p2p->pending_action_state = P2P_PENDING_SD;
257
258 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr,
259 p2p->cfg->dev_addr, dev->info.p2p_device_addr,
260 wpabuf_head(req), wpabuf_len(req), 5000) < 0) {
261 p2p_dbg(p2p, "Failed to send Action frame");
262 ret = -1;
263 }
264
265 wpabuf_free(req);
266
267 return ret;
268}
269
270
271void p2p_rx_gas_initial_req(struct p2p_data *p2p, const u8 *sa,
272 const u8 *data, size_t len, int rx_freq)
273{
274 const u8 *pos = data;
275 const u8 *end = data + len;
276 const u8 *next;
277 u8 dialog_token;
278 u16 slen;
279 int freq;
280 u16 update_indic;
281
282
283 if (p2p->cfg->sd_request == NULL)
284 return;
285
286 if (rx_freq > 0)
287 freq = rx_freq;
288 else
289 freq = p2p_channel_to_freq(p2p->cfg->reg_class,
290 p2p->cfg->channel);
291 if (freq < 0)
292 return;
293
294 if (len < 1 + 2)
295 return;
296
297 dialog_token = *pos++;
298 p2p_dbg(p2p, "GAS Initial Request from " MACSTR
299 " (dialog token %u, freq %d)",
300 MAC2STR(sa), dialog_token, rx_freq);
301
302 if (*pos != WLAN_EID_ADV_PROTO) {
303 p2p_dbg(p2p, "Unexpected IE in GAS Initial Request: %u", *pos);
304 return;
305 }
306 pos++;
307
308 slen = *pos++;
309 next = pos + slen;
310 if (next > end || slen < 2) {
311 p2p_dbg(p2p, "Invalid IE in GAS Initial Request");
312 return;
313 }
314 pos++; /* skip QueryRespLenLimit and PAME-BI */
315
316 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) {
317 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u",
318 *pos);
319 return;
320 }
321
322 pos = next;
323 /* Query Request */
324 if (pos + 2 > end)
325 return;
326 slen = WPA_GET_LE16(pos);
327 pos += 2;
328 if (pos + slen > end)
329 return;
330 end = pos + slen;
331
332 /* ANQP Query Request */
333 if (pos + 4 > end)
334 return;
335 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) {
336 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos));
337 return;
338 }
339 pos += 2;
340
341 slen = WPA_GET_LE16(pos);
342 pos += 2;
343 if (pos + slen > end || slen < 3 + 1) {
344 p2p_dbg(p2p, "Invalid ANQP Query Request length");
345 return;
346 }
347
348 if (WPA_GET_BE24(pos) != OUI_WFA) {
349 p2p_dbg(p2p, "Unsupported ANQP OUI %06x", WPA_GET_BE24(pos));
350 return;
351 }
352 pos += 3;
353
354 if (*pos != P2P_OUI_TYPE) {
355 p2p_dbg(p2p, "Unsupported ANQP vendor type %u", *pos);
356 return;
357 }
358 pos++;
359
360 if (pos + 2 > end)
361 return;
362 update_indic = WPA_GET_LE16(pos);
363 p2p_dbg(p2p, "Service Update Indicator: %u", update_indic);
364 pos += 2;
365
366 p2p->cfg->sd_request(p2p->cfg->cb_ctx, freq, sa, dialog_token,
367 update_indic, pos, end - pos);
368 /* the response will be indicated with a call to p2p_sd_response() */
369}
370
371
372void p2p_sd_response(struct p2p_data *p2p, int freq, const u8 *dst,
373 u8 dialog_token, const struct wpabuf *resp_tlvs)
374{
375 struct wpabuf *resp;
376
377 /* TODO: fix the length limit to match with the maximum frame length */
378 if (wpabuf_len(resp_tlvs) > 1400) {
379 p2p_dbg(p2p, "SD response long enough to require fragmentation");
380 if (p2p->sd_resp) {
381 /*
382 * TODO: Could consider storing the fragmented response
383 * separately for each peer to avoid having to drop old
384 * one if there is more than one pending SD query.
385 * Though, that would eat more memory, so there are
386 * also benefits to just using a single buffer.
387 */
388 p2p_dbg(p2p, "Drop previous SD response");
389 wpabuf_free(p2p->sd_resp);
390 }
391 p2p->sd_resp = wpabuf_dup(resp_tlvs);
392 if (p2p->sd_resp == NULL) {
393 p2p_err(p2p, "Failed to allocate SD response fragmentation area");
394 return;
395 }
396 os_memcpy(p2p->sd_resp_addr, dst, ETH_ALEN);
397 p2p->sd_resp_dialog_token = dialog_token;
398 p2p->sd_resp_pos = 0;
399 p2p->sd_frag_id = 0;
400 resp = p2p_build_sd_response(dialog_token, WLAN_STATUS_SUCCESS,
401 1, p2p->srv_update_indic, NULL);
402 } else {
403 p2p_dbg(p2p, "SD response fits in initial response");
404 resp = p2p_build_sd_response(dialog_token,
405 WLAN_STATUS_SUCCESS, 0,
406 p2p->srv_update_indic, resp_tlvs);
407 }
408 if (resp == NULL)
409 return;
410
411 p2p->pending_action_state = P2P_NO_PENDING_ACTION;
412 if (p2p_send_action(p2p, freq, dst, p2p->cfg->dev_addr,
413 p2p->cfg->dev_addr,
414 wpabuf_head(resp), wpabuf_len(resp), 200) < 0)
415 p2p_dbg(p2p, "Failed to send Action frame");
416
417 wpabuf_free(resp);
418}
419
420
421void p2p_rx_gas_initial_resp(struct p2p_data *p2p, const u8 *sa,
422 const u8 *data, size_t len, int rx_freq)
423{
424 const u8 *pos = data;
425 const u8 *end = data + len;
426 const u8 *next;
427 u8 dialog_token;
428 u16 status_code;
429 u16 comeback_delay;
430 u16 slen;
431 u16 update_indic;
432
433 if (p2p->state != P2P_SD_DURING_FIND || p2p->sd_peer == NULL ||
434 os_memcmp(sa, p2p->sd_peer->info.p2p_device_addr, ETH_ALEN) != 0) {
435 p2p_dbg(p2p, "Ignore unexpected GAS Initial Response from "
436 MACSTR, MAC2STR(sa));
437 return;
438 }
439 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
440 p2p_clear_timeout(p2p);
441
442 p2p_dbg(p2p, "Received GAS Initial Response from " MACSTR " (len=%d)",
443 MAC2STR(sa), (int) len);
444
445 if (len < 5 + 2) {
446 p2p_dbg(p2p, "Too short GAS Initial Response frame");
447 return;
448 }
449
450 dialog_token = *pos++;
451 /* TODO: check dialog_token match */
452 status_code = WPA_GET_LE16(pos);
453 pos += 2;
454 comeback_delay = WPA_GET_LE16(pos);
455 pos += 2;
456 p2p_dbg(p2p, "dialog_token=%u status_code=%u comeback_delay=%u",
457 dialog_token, status_code, comeback_delay);
458 if (status_code) {
459 p2p_dbg(p2p, "Service Discovery failed: status code %u",
460 status_code);
461 return;
462 }
463
464 if (*pos != WLAN_EID_ADV_PROTO) {
465 p2p_dbg(p2p, "Unexpected IE in GAS Initial Response: %u", *pos);
466 return;
467 }
468 pos++;
469
470 slen = *pos++;
471 next = pos + slen;
472 if (next > end || slen < 2) {
473 p2p_dbg(p2p, "Invalid IE in GAS Initial Response");
474 return;
475 }
476 pos++; /* skip QueryRespLenLimit and PAME-BI */
477
478 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) {
479 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u",
480 *pos);
481 return;
482 }
483
484 pos = next;
485 /* Query Response */
486 if (pos + 2 > end) {
487 p2p_dbg(p2p, "Too short Query Response");
488 return;
489 }
490 slen = WPA_GET_LE16(pos);
491 pos += 2;
492 p2p_dbg(p2p, "Query Response Length: %d", slen);
493 if (pos + slen > end) {
494 p2p_dbg(p2p, "Not enough Query Response data");
495 return;
496 }
497 end = pos + slen;
498
499 if (comeback_delay) {
500 p2p_dbg(p2p, "Fragmented response - request fragments");
501 if (p2p->sd_rx_resp) {
502 p2p_dbg(p2p, "Drop old SD reassembly buffer");
503 wpabuf_free(p2p->sd_rx_resp);
504 p2p->sd_rx_resp = NULL;
505 }
506 p2p_send_gas_comeback_req(p2p, sa, dialog_token, rx_freq);
507 return;
508 }
509
510 /* ANQP Query Response */
511 if (pos + 4 > end)
512 return;
513 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) {
514 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos));
515 return;
516 }
517 pos += 2;
518
519 slen = WPA_GET_LE16(pos);
520 pos += 2;
521 if (pos + slen > end || slen < 3 + 1) {
522 p2p_dbg(p2p, "Invalid ANQP Query Response length");
523 return;
524 }
525
526 if (WPA_GET_BE24(pos) != OUI_WFA) {
527 p2p_dbg(p2p, "Unsupported ANQP OUI %06x", WPA_GET_BE24(pos));
528 return;
529 }
530 pos += 3;
531
532 if (*pos != P2P_OUI_TYPE) {
533 p2p_dbg(p2p, "Unsupported ANQP vendor type %u", *pos);
534 return;
535 }
536 pos++;
537
538 if (pos + 2 > end)
539 return;
540 update_indic = WPA_GET_LE16(pos);
541 p2p_dbg(p2p, "Service Update Indicator: %u", update_indic);
542 pos += 2;
543
544 p2p->sd_peer->flags |= P2P_DEV_SD_INFO;
545 p2p->sd_peer->flags &= ~P2P_DEV_SD_SCHEDULE;
546 p2p->sd_peer = NULL;
547
548 if (p2p->sd_query) {
549 if (!p2p->sd_query->for_all_peers) {
550 struct p2p_sd_query *q;
551 p2p_dbg(p2p, "Remove completed SD query %p",
552 p2p->sd_query);
553 q = p2p->sd_query;
554 p2p_unlink_sd_query(p2p, p2p->sd_query);
555 p2p_free_sd_query(q);
556 }
557 p2p->sd_query = NULL;
558 }
559
560 if (p2p->cfg->sd_response)
561 p2p->cfg->sd_response(p2p->cfg->cb_ctx, sa, update_indic,
562 pos, end - pos);
563 p2p_continue_find(p2p);
564}
565
566
567void p2p_rx_gas_comeback_req(struct p2p_data *p2p, const u8 *sa,
568 const u8 *data, size_t len, int rx_freq)
569{
570 struct wpabuf *resp;
571 u8 dialog_token;
572 size_t frag_len;
573 int more = 0;
574
575 wpa_hexdump(MSG_DEBUG, "P2P: RX GAS Comeback Request", data, len);
576 if (len < 1)
577 return;
578 dialog_token = *data;
579 p2p_dbg(p2p, "Dialog Token: %u", dialog_token);
580 if (dialog_token != p2p->sd_resp_dialog_token) {
581 p2p_dbg(p2p, "No pending SD response fragment for dialog token %u",
582 dialog_token);
583 return;
584 }
585
586 if (p2p->sd_resp == NULL) {
587 p2p_dbg(p2p, "No pending SD response fragment available");
588 return;
589 }
590 if (os_memcmp(sa, p2p->sd_resp_addr, ETH_ALEN) != 0) {
591 p2p_dbg(p2p, "No pending SD response fragment for " MACSTR,
592 MAC2STR(sa));
593 return;
594 }
595
596 frag_len = wpabuf_len(p2p->sd_resp) - p2p->sd_resp_pos;
597 if (frag_len > 1400) {
598 frag_len = 1400;
599 more = 1;
600 }
601 resp = p2p_build_gas_comeback_resp(dialog_token, WLAN_STATUS_SUCCESS,
602 p2p->srv_update_indic,
603 wpabuf_head_u8(p2p->sd_resp) +
604 p2p->sd_resp_pos, frag_len,
605 p2p->sd_frag_id, more,
606 wpabuf_len(p2p->sd_resp));
607 if (resp == NULL)
608 return;
609 p2p_dbg(p2p, "Send GAS Comeback Response (frag_id %d more=%d frag_len=%d)",
610 p2p->sd_frag_id, more, (int) frag_len);
611 p2p->sd_frag_id++;
612 p2p->sd_resp_pos += frag_len;
613
614 if (more) {
615 p2p_dbg(p2p, "%d more bytes remain to be sent",
616 (int) (wpabuf_len(p2p->sd_resp) - p2p->sd_resp_pos));
617 } else {
618 p2p_dbg(p2p, "All fragments of SD response sent");
619 wpabuf_free(p2p->sd_resp);
620 p2p->sd_resp = NULL;
621 }
622
623 p2p->pending_action_state = P2P_NO_PENDING_ACTION;
624 if (p2p_send_action(p2p, rx_freq, sa, p2p->cfg->dev_addr,
625 p2p->cfg->dev_addr,
626 wpabuf_head(resp), wpabuf_len(resp), 200) < 0)
627 p2p_dbg(p2p, "Failed to send Action frame");
628
629 wpabuf_free(resp);
630}
631
632
633void p2p_rx_gas_comeback_resp(struct p2p_data *p2p, const u8 *sa,
634 const u8 *data, size_t len, int rx_freq)
635{
636 const u8 *pos = data;
637 const u8 *end = data + len;
638 const u8 *next;
639 u8 dialog_token;
640 u16 status_code;
641 u8 frag_id;
642 u8 more_frags;
643 u16 comeback_delay;
644 u16 slen;
645
646 wpa_hexdump(MSG_DEBUG, "P2P: RX GAS Comeback Response", data, len);
647
648 if (p2p->state != P2P_SD_DURING_FIND || p2p->sd_peer == NULL ||
649 os_memcmp(sa, p2p->sd_peer->info.p2p_device_addr, ETH_ALEN) != 0) {
650 p2p_dbg(p2p, "Ignore unexpected GAS Comeback Response from "
651 MACSTR, MAC2STR(sa));
652 return;
653 }
654 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
655 p2p_clear_timeout(p2p);
656
657 p2p_dbg(p2p, "Received GAS Comeback Response from " MACSTR " (len=%d)",
658 MAC2STR(sa), (int) len);
659
660 if (len < 6 + 2) {
661 p2p_dbg(p2p, "Too short GAS Comeback Response frame");
662 return;
663 }
664
665 dialog_token = *pos++;
666 /* TODO: check dialog_token match */
667 status_code = WPA_GET_LE16(pos);
668 pos += 2;
669 frag_id = *pos & 0x7f;
670 more_frags = (*pos & 0x80) >> 7;
671 pos++;
672 comeback_delay = WPA_GET_LE16(pos);
673 pos += 2;
674 p2p_dbg(p2p, "dialog_token=%u status_code=%u frag_id=%d more_frags=%d "
675 "comeback_delay=%u",
676 dialog_token, status_code, frag_id, more_frags,
677 comeback_delay);
678 /* TODO: check frag_id match */
679 if (status_code) {
680 p2p_dbg(p2p, "Service Discovery failed: status code %u",
681 status_code);
682 return;
683 }
684
685 if (*pos != WLAN_EID_ADV_PROTO) {
686 p2p_dbg(p2p, "Unexpected IE in GAS Comeback Response: %u",
687 *pos);
688 return;
689 }
690 pos++;
691
692 slen = *pos++;
693 next = pos + slen;
694 if (next > end || slen < 2) {
695 p2p_dbg(p2p, "Invalid IE in GAS Comeback Response");
696 return;
697 }
698 pos++; /* skip QueryRespLenLimit and PAME-BI */
699
700 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) {
701 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u",
702 *pos);
703 return;
704 }
705
706 pos = next;
707 /* Query Response */
708 if (pos + 2 > end) {
709 p2p_dbg(p2p, "Too short Query Response");
710 return;
711 }
712 slen = WPA_GET_LE16(pos);
713 pos += 2;
714 p2p_dbg(p2p, "Query Response Length: %d", slen);
715 if (pos + slen > end) {
716 p2p_dbg(p2p, "Not enough Query Response data");
717 return;
718 }
719 if (slen == 0) {
720 p2p_dbg(p2p, "No Query Response data");
721 return;
722 }
723 end = pos + slen;
724
725 if (p2p->sd_rx_resp) {
726 /*
727 * ANQP header is only included in the first fragment; rest of
728 * the fragments start with continue TLVs.
729 */
730 goto skip_nqp_header;
731 }
732
733 /* ANQP Query Response */
734 if (pos + 4 > end)
735 return;
736 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) {
737 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos));
738 return;
739 }
740 pos += 2;
741
742 slen = WPA_GET_LE16(pos);
743 pos += 2;
744 p2p_dbg(p2p, "ANQP Query Response length: %u", slen);
745 if (slen < 3 + 1) {
746 p2p_dbg(p2p, "Invalid ANQP Query Response length");
747 return;
748 }
749 if (pos + 4 > end)
750 return;
751
752 if (WPA_GET_BE24(pos) != OUI_WFA) {
753 p2p_dbg(p2p, "Unsupported ANQP OUI %06x", WPA_GET_BE24(pos));
754 return;
755 }
756 pos += 3;
757
758 if (*pos != P2P_OUI_TYPE) {
759 p2p_dbg(p2p, "Unsupported ANQP vendor type %u", *pos);
760 return;
761 }
762 pos++;
763
764 if (pos + 2 > end)
765 return;
766 p2p->sd_rx_update_indic = WPA_GET_LE16(pos);
767 p2p_dbg(p2p, "Service Update Indicator: %u", p2p->sd_rx_update_indic);
768 pos += 2;
769
770skip_nqp_header:
771 if (wpabuf_resize(&p2p->sd_rx_resp, end - pos) < 0)
772 return;
773 wpabuf_put_data(p2p->sd_rx_resp, pos, end - pos);
774 p2p_dbg(p2p, "Current SD reassembly buffer length: %u",
775 (unsigned int) wpabuf_len(p2p->sd_rx_resp));
776
777 if (more_frags) {
778 p2p_dbg(p2p, "More fragments remains");
779 /* TODO: what would be a good size limit? */
780 if (wpabuf_len(p2p->sd_rx_resp) > 64000) {
781 wpabuf_free(p2p->sd_rx_resp);
782 p2p->sd_rx_resp = NULL;
783 p2p_dbg(p2p, "Too long SD response - drop it");
784 return;
785 }
786 p2p_send_gas_comeback_req(p2p, sa, dialog_token, rx_freq);
787 return;
788 }
789
790 p2p->sd_peer->flags |= P2P_DEV_SD_INFO;
791 p2p->sd_peer->flags &= ~P2P_DEV_SD_SCHEDULE;
792 p2p->sd_peer = NULL;
793
794 if (p2p->sd_query) {
795 if (!p2p->sd_query->for_all_peers) {
796 struct p2p_sd_query *q;
797 p2p_dbg(p2p, "Remove completed SD query %p",
798 p2p->sd_query);
799 q = p2p->sd_query;
800 p2p_unlink_sd_query(p2p, p2p->sd_query);
801 p2p_free_sd_query(q);
802 }
803 p2p->sd_query = NULL;
804 }
805
806 if (p2p->cfg->sd_response)
807 p2p->cfg->sd_response(p2p->cfg->cb_ctx, sa,
808 p2p->sd_rx_update_indic,
809 wpabuf_head(p2p->sd_rx_resp),
810 wpabuf_len(p2p->sd_rx_resp));
811 wpabuf_free(p2p->sd_rx_resp);
812 p2p->sd_rx_resp = NULL;
813
814 p2p_continue_find(p2p);
815}
816
817
818void * p2p_sd_request(struct p2p_data *p2p, const u8 *dst,
819 const struct wpabuf *tlvs)
820{
821 struct p2p_sd_query *q;
822
823 q = os_zalloc(sizeof(*q));
824 if (q == NULL)
825 return NULL;
826
827 if (dst)
828 os_memcpy(q->peer, dst, ETH_ALEN);
829 else
830 q->for_all_peers = 1;
831
832 q->tlvs = wpabuf_dup(tlvs);
833 if (q->tlvs == NULL) {
834 p2p_free_sd_query(q);
835 return NULL;
836 }
837
838 q->next = p2p->sd_queries;
839 p2p->sd_queries = q;
840 p2p_dbg(p2p, "Added SD Query %p", q);
841
842 if (dst == NULL) {
843 struct p2p_device *dev;
844 dl_list_for_each(dev, &p2p->devices, struct p2p_device, list)
845 dev->flags &= ~P2P_DEV_SD_INFO;
846 }
847
848 return q;
849}
850
851
852#ifdef CONFIG_WIFI_DISPLAY
853void * p2p_sd_request_wfd(struct p2p_data *p2p, const u8 *dst,
854 const struct wpabuf *tlvs)
855{
856 struct p2p_sd_query *q;
857 q = p2p_sd_request(p2p, dst, tlvs);
858 if (q)
859 q->wsd = 1;
860 return q;
861}
862#endif /* CONFIG_WIFI_DISPLAY */
863
864
865void p2p_sd_service_update(struct p2p_data *p2p)
866{
867 p2p->srv_update_indic++;
868}
869
870
871int p2p_sd_cancel_request(struct p2p_data *p2p, void *req)
872{
873 if (p2p_unlink_sd_query(p2p, req)) {
874 p2p_dbg(p2p, "Cancel pending SD query %p", req);
875 p2p_free_sd_query(req);
876 return 0;
877 }
878 return -1;
879}