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
wfd_wsd_supported(struct wpabuf * wfd)19 static 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
p2p_pending_sd_req(struct p2p_data * p2p,struct p2p_device * dev)50 struct 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 int count = 0;
56
57 if (!(dev->info.dev_capab & P2P_DEV_CAPAB_SERVICE_DISCOVERY))
58 return NULL; /* peer does not support SD */
59 #ifdef CONFIG_WIFI_DISPLAY
60 if (wfd_wsd_supported(dev->info.wfd_subelems))
61 wsd = 1;
62 #endif /* CONFIG_WIFI_DISPLAY */
63
64 for (q = p2p->sd_queries; q; q = q->next) {
65 /* Use WSD only if the peer indicates support or it */
66 if (q->wsd && !wsd)
67 continue;
68 /* if the query is a broadcast query */
69 if (q->for_all_peers) {
70 /*
71 * check if there are any broadcast queries pending for
72 * this device
73 */
74 if (dev->sd_pending_bcast_queries <= 0)
75 return NULL;
76 /* query number that needs to be send to the device */
77 if (count == dev->sd_pending_bcast_queries - 1)
78 return q;
79 count++;
80 }
81 if (!q->for_all_peers &&
82 os_memcmp(q->peer, dev->info.p2p_device_addr, ETH_ALEN) ==
83 0)
84 return q;
85 }
86
87 return NULL;
88 }
89
90
p2p_decrease_sd_bc_queries(struct p2p_data * p2p,int query_number)91 static void p2p_decrease_sd_bc_queries(struct p2p_data *p2p, int query_number)
92 {
93 struct p2p_device *dev;
94
95 p2p->num_p2p_sd_queries--;
96 dl_list_for_each(dev, &p2p->devices, struct p2p_device, list) {
97 if (query_number <= dev->sd_pending_bcast_queries - 1) {
98 /*
99 * Query not yet sent to the device and it is to be
100 * removed, so update the pending count.
101 */
102 dev->sd_pending_bcast_queries--;
103 }
104 }
105 }
106
107
p2p_unlink_sd_query(struct p2p_data * p2p,struct p2p_sd_query * query)108 static int p2p_unlink_sd_query(struct p2p_data *p2p,
109 struct p2p_sd_query *query)
110 {
111 struct p2p_sd_query *q, *prev;
112 int query_number = 0;
113
114 q = p2p->sd_queries;
115 prev = NULL;
116 while (q) {
117 if (q == query) {
118 /* If the query is a broadcast query, decrease one from
119 * all the devices */
120 if (query->for_all_peers)
121 p2p_decrease_sd_bc_queries(p2p, query_number);
122 if (prev)
123 prev->next = q->next;
124 else
125 p2p->sd_queries = q->next;
126 if (p2p->sd_query == query)
127 p2p->sd_query = NULL;
128 return 1;
129 }
130 if (q->for_all_peers)
131 query_number++;
132 prev = q;
133 q = q->next;
134 }
135 return 0;
136 }
137
138
p2p_free_sd_query(struct p2p_sd_query * q)139 static void p2p_free_sd_query(struct p2p_sd_query *q)
140 {
141 if (q == NULL)
142 return;
143 wpabuf_free(q->tlvs);
144 os_free(q);
145 }
146
147
p2p_free_sd_queries(struct p2p_data * p2p)148 void p2p_free_sd_queries(struct p2p_data *p2p)
149 {
150 struct p2p_sd_query *q, *prev;
151 q = p2p->sd_queries;
152 p2p->sd_queries = NULL;
153 while (q) {
154 prev = q;
155 q = q->next;
156 p2p_free_sd_query(prev);
157 }
158 p2p->num_p2p_sd_queries = 0;
159 }
160
161
p2p_build_sd_query(u16 update_indic,struct wpabuf * tlvs)162 static struct wpabuf * p2p_build_sd_query(u16 update_indic,
163 struct wpabuf *tlvs)
164 {
165 struct wpabuf *buf;
166 u8 *len_pos;
167
168 buf = gas_anqp_build_initial_req(0, 100 + wpabuf_len(tlvs));
169 if (buf == NULL)
170 return NULL;
171
172 /* ANQP Query Request Frame */
173 len_pos = gas_anqp_add_element(buf, ANQP_VENDOR_SPECIFIC);
174 wpabuf_put_be32(buf, P2P_IE_VENDOR_TYPE);
175 wpabuf_put_le16(buf, update_indic); /* Service Update Indicator */
176 wpabuf_put_buf(buf, tlvs);
177 gas_anqp_set_element_len(buf, len_pos);
178
179 gas_anqp_set_len(buf);
180
181 return buf;
182 }
183
184
p2p_send_gas_comeback_req(struct p2p_data * p2p,const u8 * dst,u8 dialog_token,int freq)185 static void p2p_send_gas_comeback_req(struct p2p_data *p2p, const u8 *dst,
186 u8 dialog_token, int freq)
187 {
188 struct wpabuf *req;
189
190 req = gas_build_comeback_req(dialog_token);
191 if (req == NULL)
192 return;
193
194 p2p->pending_action_state = P2P_NO_PENDING_ACTION;
195 if (p2p_send_action(p2p, freq, dst, p2p->cfg->dev_addr, dst,
196 wpabuf_head(req), wpabuf_len(req), 200) < 0)
197 p2p_dbg(p2p, "Failed to send Action frame");
198
199 wpabuf_free(req);
200 }
201
202
p2p_build_sd_response(u8 dialog_token,u16 status_code,u16 comeback_delay,u16 update_indic,const struct wpabuf * tlvs)203 static struct wpabuf * p2p_build_sd_response(u8 dialog_token, u16 status_code,
204 u16 comeback_delay,
205 u16 update_indic,
206 const struct wpabuf *tlvs)
207 {
208 struct wpabuf *buf;
209 u8 *len_pos;
210
211 buf = gas_anqp_build_initial_resp(dialog_token, status_code,
212 comeback_delay,
213 100 + (tlvs ? wpabuf_len(tlvs) : 0));
214 if (buf == NULL)
215 return NULL;
216
217 if (tlvs) {
218 /* ANQP Query Response Frame */
219 len_pos = gas_anqp_add_element(buf, ANQP_VENDOR_SPECIFIC);
220 wpabuf_put_be32(buf, P2P_IE_VENDOR_TYPE);
221 /* Service Update Indicator */
222 wpabuf_put_le16(buf, update_indic);
223 wpabuf_put_buf(buf, tlvs);
224 gas_anqp_set_element_len(buf, len_pos);
225 }
226
227 gas_anqp_set_len(buf);
228
229 return buf;
230 }
231
232
p2p_build_gas_comeback_resp(u8 dialog_token,u16 status_code,u16 update_indic,const u8 * data,size_t len,u8 frag_id,u8 more,u16 total_len)233 static struct wpabuf * p2p_build_gas_comeback_resp(u8 dialog_token,
234 u16 status_code,
235 u16 update_indic,
236 const u8 *data, size_t len,
237 u8 frag_id, u8 more,
238 u16 total_len)
239 {
240 struct wpabuf *buf;
241
242 buf = gas_anqp_build_comeback_resp(dialog_token, status_code, frag_id,
243 more, 0, 100 + len);
244 if (buf == NULL)
245 return NULL;
246
247 if (frag_id == 0) {
248 /* ANQP Query Response Frame */
249 wpabuf_put_le16(buf, ANQP_VENDOR_SPECIFIC); /* Info ID */
250 wpabuf_put_le16(buf, 3 + 1 + 2 + total_len);
251 wpabuf_put_be32(buf, P2P_IE_VENDOR_TYPE);
252 /* Service Update Indicator */
253 wpabuf_put_le16(buf, update_indic);
254 }
255
256 wpabuf_put_data(buf, data, len);
257 gas_anqp_set_len(buf);
258
259 return buf;
260 }
261
262
p2p_start_sd(struct p2p_data * p2p,struct p2p_device * dev)263 int p2p_start_sd(struct p2p_data *p2p, struct p2p_device *dev)
264 {
265 struct wpabuf *req;
266 int ret = 0;
267 struct p2p_sd_query *query;
268 int freq;
269 unsigned int wait_time;
270
271 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
272 if (freq <= 0) {
273 p2p_dbg(p2p, "No Listen/Operating frequency known for the peer "
274 MACSTR " to send SD Request",
275 MAC2STR(dev->info.p2p_device_addr));
276 return -1;
277 }
278
279 query = p2p_pending_sd_req(p2p, dev);
280 if (query == NULL)
281 return -1;
282
283 p2p_dbg(p2p, "Start Service Discovery with " MACSTR,
284 MAC2STR(dev->info.p2p_device_addr));
285
286 req = p2p_build_sd_query(p2p->srv_update_indic, query->tlvs);
287 if (req == NULL)
288 return -1;
289
290 p2p->sd_peer = dev;
291 p2p->sd_query = query;
292 p2p->pending_action_state = P2P_PENDING_SD;
293
294 wait_time = 5000;
295 if (p2p->cfg->max_listen && wait_time > p2p->cfg->max_listen)
296 wait_time = p2p->cfg->max_listen;
297 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr,
298 p2p->cfg->dev_addr, dev->info.p2p_device_addr,
299 wpabuf_head(req), wpabuf_len(req), wait_time) < 0) {
300 p2p_dbg(p2p, "Failed to send Action frame");
301 ret = -1;
302 }
303
304 /* Update the pending broadcast SD query count for this device */
305 dev->sd_pending_bcast_queries--;
306
307 /*
308 * If there are no pending broadcast queries for this device, mark it as
309 * done (-1).
310 */
311 if (dev->sd_pending_bcast_queries == 0)
312 dev->sd_pending_bcast_queries = -1;
313
314 wpabuf_free(req);
315
316 return ret;
317 }
318
319
p2p_rx_gas_initial_req(struct p2p_data * p2p,const u8 * sa,const u8 * data,size_t len,int rx_freq)320 void p2p_rx_gas_initial_req(struct p2p_data *p2p, const u8 *sa,
321 const u8 *data, size_t len, int rx_freq)
322 {
323 const u8 *pos = data;
324 const u8 *end = data + len;
325 const u8 *next;
326 u8 dialog_token;
327 u16 slen;
328 int freq;
329 u16 update_indic;
330
331
332 if (p2p->cfg->sd_request == NULL)
333 return;
334
335 if (rx_freq > 0)
336 freq = rx_freq;
337 else
338 freq = p2p_channel_to_freq(p2p->cfg->reg_class,
339 p2p->cfg->channel);
340 if (freq < 0)
341 return;
342
343 if (len < 1 + 2)
344 return;
345
346 dialog_token = *pos++;
347 p2p_dbg(p2p, "GAS Initial Request from " MACSTR
348 " (dialog token %u, freq %d)",
349 MAC2STR(sa), dialog_token, rx_freq);
350
351 if (*pos != WLAN_EID_ADV_PROTO) {
352 p2p_dbg(p2p, "Unexpected IE in GAS Initial Request: %u", *pos);
353 return;
354 }
355 pos++;
356
357 slen = *pos++;
358 next = pos + slen;
359 if (next > end || slen < 2) {
360 p2p_dbg(p2p, "Invalid IE in GAS Initial Request");
361 return;
362 }
363 pos++; /* skip QueryRespLenLimit and PAME-BI */
364
365 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) {
366 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u",
367 *pos);
368 return;
369 }
370
371 pos = next;
372 /* Query Request */
373 if (pos + 2 > end)
374 return;
375 slen = WPA_GET_LE16(pos);
376 pos += 2;
377 if (pos + slen > end)
378 return;
379 end = pos + slen;
380
381 /* ANQP Query Request */
382 if (pos + 4 > end)
383 return;
384 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) {
385 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos));
386 return;
387 }
388 pos += 2;
389
390 slen = WPA_GET_LE16(pos);
391 pos += 2;
392 if (pos + slen > end || slen < 3 + 1) {
393 p2p_dbg(p2p, "Invalid ANQP Query Request length");
394 return;
395 }
396
397 if (WPA_GET_BE32(pos) != P2P_IE_VENDOR_TYPE) {
398 p2p_dbg(p2p, "Unsupported ANQP vendor OUI-type %08x",
399 WPA_GET_BE32(pos));
400 return;
401 }
402 pos += 4;
403
404 if (pos + 2 > end)
405 return;
406 update_indic = WPA_GET_LE16(pos);
407 p2p_dbg(p2p, "Service Update Indicator: %u", update_indic);
408 pos += 2;
409
410 p2p->cfg->sd_request(p2p->cfg->cb_ctx, freq, sa, dialog_token,
411 update_indic, pos, end - pos);
412 /* the response will be indicated with a call to p2p_sd_response() */
413 }
414
415
p2p_sd_response(struct p2p_data * p2p,int freq,const u8 * dst,u8 dialog_token,const struct wpabuf * resp_tlvs)416 void p2p_sd_response(struct p2p_data *p2p, int freq, const u8 *dst,
417 u8 dialog_token, const struct wpabuf *resp_tlvs)
418 {
419 struct wpabuf *resp;
420
421 /* TODO: fix the length limit to match with the maximum frame length */
422 if (wpabuf_len(resp_tlvs) > 1400) {
423 p2p_dbg(p2p, "SD response long enough to require fragmentation");
424 if (p2p->sd_resp) {
425 /*
426 * TODO: Could consider storing the fragmented response
427 * separately for each peer to avoid having to drop old
428 * one if there is more than one pending SD query.
429 * Though, that would eat more memory, so there are
430 * also benefits to just using a single buffer.
431 */
432 p2p_dbg(p2p, "Drop previous SD response");
433 wpabuf_free(p2p->sd_resp);
434 }
435 p2p->sd_resp = wpabuf_dup(resp_tlvs);
436 if (p2p->sd_resp == NULL) {
437 p2p_err(p2p, "Failed to allocate SD response fragmentation area");
438 return;
439 }
440 os_memcpy(p2p->sd_resp_addr, dst, ETH_ALEN);
441 p2p->sd_resp_dialog_token = dialog_token;
442 p2p->sd_resp_pos = 0;
443 p2p->sd_frag_id = 0;
444 resp = p2p_build_sd_response(dialog_token, WLAN_STATUS_SUCCESS,
445 1, p2p->srv_update_indic, NULL);
446 } else {
447 p2p_dbg(p2p, "SD response fits in initial response");
448 resp = p2p_build_sd_response(dialog_token,
449 WLAN_STATUS_SUCCESS, 0,
450 p2p->srv_update_indic, resp_tlvs);
451 }
452 if (resp == NULL)
453 return;
454
455 p2p->pending_action_state = P2P_NO_PENDING_ACTION;
456 if (p2p_send_action(p2p, freq, dst, p2p->cfg->dev_addr,
457 p2p->cfg->dev_addr,
458 wpabuf_head(resp), wpabuf_len(resp), 200) < 0)
459 p2p_dbg(p2p, "Failed to send Action frame");
460
461 wpabuf_free(resp);
462 }
463
464
p2p_rx_gas_initial_resp(struct p2p_data * p2p,const u8 * sa,const u8 * data,size_t len,int rx_freq)465 void p2p_rx_gas_initial_resp(struct p2p_data *p2p, const u8 *sa,
466 const u8 *data, size_t len, int rx_freq)
467 {
468 const u8 *pos = data;
469 const u8 *end = data + len;
470 const u8 *next;
471 u8 dialog_token;
472 u16 status_code;
473 u16 comeback_delay;
474 u16 slen;
475 u16 update_indic;
476
477 if (p2p->state != P2P_SD_DURING_FIND || p2p->sd_peer == NULL ||
478 os_memcmp(sa, p2p->sd_peer->info.p2p_device_addr, ETH_ALEN) != 0) {
479 p2p_dbg(p2p, "Ignore unexpected GAS Initial Response from "
480 MACSTR, MAC2STR(sa));
481 return;
482 }
483 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
484 p2p_clear_timeout(p2p);
485
486 p2p_dbg(p2p, "Received GAS Initial Response from " MACSTR " (len=%d)",
487 MAC2STR(sa), (int) len);
488
489 if (len < 5 + 2) {
490 p2p_dbg(p2p, "Too short GAS Initial Response frame");
491 return;
492 }
493
494 dialog_token = *pos++;
495 /* TODO: check dialog_token match */
496 status_code = WPA_GET_LE16(pos);
497 pos += 2;
498 comeback_delay = WPA_GET_LE16(pos);
499 pos += 2;
500 p2p_dbg(p2p, "dialog_token=%u status_code=%u comeback_delay=%u",
501 dialog_token, status_code, comeback_delay);
502 if (status_code) {
503 p2p_dbg(p2p, "Service Discovery failed: status code %u",
504 status_code);
505 return;
506 }
507
508 if (*pos != WLAN_EID_ADV_PROTO) {
509 p2p_dbg(p2p, "Unexpected IE in GAS Initial Response: %u", *pos);
510 return;
511 }
512 pos++;
513
514 slen = *pos++;
515 next = pos + slen;
516 if (next > end || slen < 2) {
517 p2p_dbg(p2p, "Invalid IE in GAS Initial Response");
518 return;
519 }
520 pos++; /* skip QueryRespLenLimit and PAME-BI */
521
522 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) {
523 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u",
524 *pos);
525 return;
526 }
527
528 pos = next;
529 /* Query Response */
530 if (pos + 2 > end) {
531 p2p_dbg(p2p, "Too short Query Response");
532 return;
533 }
534 slen = WPA_GET_LE16(pos);
535 pos += 2;
536 p2p_dbg(p2p, "Query Response Length: %d", slen);
537 if (pos + slen > end) {
538 p2p_dbg(p2p, "Not enough Query Response data");
539 return;
540 }
541 end = pos + slen;
542
543 if (comeback_delay) {
544 p2p_dbg(p2p, "Fragmented response - request fragments");
545 if (p2p->sd_rx_resp) {
546 p2p_dbg(p2p, "Drop old SD reassembly buffer");
547 wpabuf_free(p2p->sd_rx_resp);
548 p2p->sd_rx_resp = NULL;
549 }
550 p2p_send_gas_comeback_req(p2p, sa, dialog_token, rx_freq);
551 return;
552 }
553
554 /* ANQP Query Response */
555 if (pos + 4 > end)
556 return;
557 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) {
558 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos));
559 return;
560 }
561 pos += 2;
562
563 slen = WPA_GET_LE16(pos);
564 pos += 2;
565 if (pos + slen > end || slen < 3 + 1) {
566 p2p_dbg(p2p, "Invalid ANQP Query Response length");
567 return;
568 }
569
570 if (WPA_GET_BE32(pos) != P2P_IE_VENDOR_TYPE) {
571 p2p_dbg(p2p, "Unsupported ANQP vendor OUI-type %08x",
572 WPA_GET_BE32(pos));
573 return;
574 }
575 pos += 4;
576
577 if (pos + 2 > end)
578 return;
579 update_indic = WPA_GET_LE16(pos);
580 p2p_dbg(p2p, "Service Update Indicator: %u", update_indic);
581 pos += 2;
582
583 p2p->sd_peer = NULL;
584
585 if (p2p->sd_query) {
586 if (!p2p->sd_query->for_all_peers) {
587 struct p2p_sd_query *q;
588 p2p_dbg(p2p, "Remove completed SD query %p",
589 p2p->sd_query);
590 q = p2p->sd_query;
591 p2p_unlink_sd_query(p2p, p2p->sd_query);
592 p2p_free_sd_query(q);
593 }
594 p2p->sd_query = NULL;
595 }
596
597 if (p2p->cfg->sd_response)
598 p2p->cfg->sd_response(p2p->cfg->cb_ctx, sa, update_indic,
599 pos, end - pos);
600 p2p_continue_find(p2p);
601 }
602
603
p2p_rx_gas_comeback_req(struct p2p_data * p2p,const u8 * sa,const u8 * data,size_t len,int rx_freq)604 void p2p_rx_gas_comeback_req(struct p2p_data *p2p, const u8 *sa,
605 const u8 *data, size_t len, int rx_freq)
606 {
607 struct wpabuf *resp;
608 u8 dialog_token;
609 size_t frag_len;
610 int more = 0;
611
612 wpa_hexdump(MSG_DEBUG, "P2P: RX GAS Comeback Request", data, len);
613 if (len < 1)
614 return;
615 dialog_token = *data;
616 p2p_dbg(p2p, "Dialog Token: %u", dialog_token);
617 if (dialog_token != p2p->sd_resp_dialog_token) {
618 p2p_dbg(p2p, "No pending SD response fragment for dialog token %u",
619 dialog_token);
620 return;
621 }
622
623 if (p2p->sd_resp == NULL) {
624 p2p_dbg(p2p, "No pending SD response fragment available");
625 return;
626 }
627 if (os_memcmp(sa, p2p->sd_resp_addr, ETH_ALEN) != 0) {
628 p2p_dbg(p2p, "No pending SD response fragment for " MACSTR,
629 MAC2STR(sa));
630 return;
631 }
632
633 frag_len = wpabuf_len(p2p->sd_resp) - p2p->sd_resp_pos;
634 if (frag_len > 1400) {
635 frag_len = 1400;
636 more = 1;
637 }
638 resp = p2p_build_gas_comeback_resp(dialog_token, WLAN_STATUS_SUCCESS,
639 p2p->srv_update_indic,
640 wpabuf_head_u8(p2p->sd_resp) +
641 p2p->sd_resp_pos, frag_len,
642 p2p->sd_frag_id, more,
643 wpabuf_len(p2p->sd_resp));
644 if (resp == NULL)
645 return;
646 p2p_dbg(p2p, "Send GAS Comeback Response (frag_id %d more=%d frag_len=%d)",
647 p2p->sd_frag_id, more, (int) frag_len);
648 p2p->sd_frag_id++;
649 p2p->sd_resp_pos += frag_len;
650
651 if (more) {
652 p2p_dbg(p2p, "%d more bytes remain to be sent",
653 (int) (wpabuf_len(p2p->sd_resp) - p2p->sd_resp_pos));
654 } else {
655 p2p_dbg(p2p, "All fragments of SD response sent");
656 wpabuf_free(p2p->sd_resp);
657 p2p->sd_resp = NULL;
658 }
659
660 p2p->pending_action_state = P2P_NO_PENDING_ACTION;
661 if (p2p_send_action(p2p, rx_freq, sa, p2p->cfg->dev_addr,
662 p2p->cfg->dev_addr,
663 wpabuf_head(resp), wpabuf_len(resp), 200) < 0)
664 p2p_dbg(p2p, "Failed to send Action frame");
665
666 wpabuf_free(resp);
667 }
668
669
p2p_rx_gas_comeback_resp(struct p2p_data * p2p,const u8 * sa,const u8 * data,size_t len,int rx_freq)670 void p2p_rx_gas_comeback_resp(struct p2p_data *p2p, const u8 *sa,
671 const u8 *data, size_t len, int rx_freq)
672 {
673 const u8 *pos = data;
674 const u8 *end = data + len;
675 const u8 *next;
676 u8 dialog_token;
677 u16 status_code;
678 u8 frag_id;
679 u8 more_frags;
680 u16 comeback_delay;
681 u16 slen;
682
683 wpa_hexdump(MSG_DEBUG, "P2P: RX GAS Comeback Response", data, len);
684
685 if (p2p->state != P2P_SD_DURING_FIND || p2p->sd_peer == NULL ||
686 os_memcmp(sa, p2p->sd_peer->info.p2p_device_addr, ETH_ALEN) != 0) {
687 p2p_dbg(p2p, "Ignore unexpected GAS Comeback Response from "
688 MACSTR, MAC2STR(sa));
689 return;
690 }
691 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
692 p2p_clear_timeout(p2p);
693
694 p2p_dbg(p2p, "Received GAS Comeback Response from " MACSTR " (len=%d)",
695 MAC2STR(sa), (int) len);
696
697 if (len < 6 + 2) {
698 p2p_dbg(p2p, "Too short GAS Comeback Response frame");
699 return;
700 }
701
702 dialog_token = *pos++;
703 /* TODO: check dialog_token match */
704 status_code = WPA_GET_LE16(pos);
705 pos += 2;
706 frag_id = *pos & 0x7f;
707 more_frags = (*pos & 0x80) >> 7;
708 pos++;
709 comeback_delay = WPA_GET_LE16(pos);
710 pos += 2;
711 p2p_dbg(p2p, "dialog_token=%u status_code=%u frag_id=%d more_frags=%d "
712 "comeback_delay=%u",
713 dialog_token, status_code, frag_id, more_frags,
714 comeback_delay);
715 /* TODO: check frag_id match */
716 if (status_code) {
717 p2p_dbg(p2p, "Service Discovery failed: status code %u",
718 status_code);
719 return;
720 }
721
722 if (*pos != WLAN_EID_ADV_PROTO) {
723 p2p_dbg(p2p, "Unexpected IE in GAS Comeback Response: %u",
724 *pos);
725 return;
726 }
727 pos++;
728
729 slen = *pos++;
730 next = pos + slen;
731 if (next > end || slen < 2) {
732 p2p_dbg(p2p, "Invalid IE in GAS Comeback Response");
733 return;
734 }
735 pos++; /* skip QueryRespLenLimit and PAME-BI */
736
737 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) {
738 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u",
739 *pos);
740 return;
741 }
742
743 pos = next;
744 /* Query Response */
745 if (pos + 2 > end) {
746 p2p_dbg(p2p, "Too short Query Response");
747 return;
748 }
749 slen = WPA_GET_LE16(pos);
750 pos += 2;
751 p2p_dbg(p2p, "Query Response Length: %d", slen);
752 if (pos + slen > end) {
753 p2p_dbg(p2p, "Not enough Query Response data");
754 return;
755 }
756 if (slen == 0) {
757 p2p_dbg(p2p, "No Query Response data");
758 return;
759 }
760 end = pos + slen;
761
762 if (p2p->sd_rx_resp) {
763 /*
764 * ANQP header is only included in the first fragment; rest of
765 * the fragments start with continue TLVs.
766 */
767 goto skip_nqp_header;
768 }
769
770 /* ANQP Query Response */
771 if (pos + 4 > end)
772 return;
773 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) {
774 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos));
775 return;
776 }
777 pos += 2;
778
779 slen = WPA_GET_LE16(pos);
780 pos += 2;
781 p2p_dbg(p2p, "ANQP Query Response length: %u", slen);
782 if (slen < 3 + 1) {
783 p2p_dbg(p2p, "Invalid ANQP Query Response length");
784 return;
785 }
786 if (pos + 4 > end)
787 return;
788
789 if (WPA_GET_BE32(pos) != P2P_IE_VENDOR_TYPE) {
790 p2p_dbg(p2p, "Unsupported ANQP vendor OUI-type %08x",
791 WPA_GET_BE32(pos));
792 return;
793 }
794 pos += 4;
795
796 if (pos + 2 > end)
797 return;
798 p2p->sd_rx_update_indic = WPA_GET_LE16(pos);
799 p2p_dbg(p2p, "Service Update Indicator: %u", p2p->sd_rx_update_indic);
800 pos += 2;
801
802 skip_nqp_header:
803 if (wpabuf_resize(&p2p->sd_rx_resp, end - pos) < 0)
804 return;
805 wpabuf_put_data(p2p->sd_rx_resp, pos, end - pos);
806 p2p_dbg(p2p, "Current SD reassembly buffer length: %u",
807 (unsigned int) wpabuf_len(p2p->sd_rx_resp));
808
809 if (more_frags) {
810 p2p_dbg(p2p, "More fragments remains");
811 /* TODO: what would be a good size limit? */
812 if (wpabuf_len(p2p->sd_rx_resp) > 64000) {
813 wpabuf_free(p2p->sd_rx_resp);
814 p2p->sd_rx_resp = NULL;
815 p2p_dbg(p2p, "Too long SD response - drop it");
816 return;
817 }
818 p2p_send_gas_comeback_req(p2p, sa, dialog_token, rx_freq);
819 return;
820 }
821
822 p2p->sd_peer = NULL;
823
824 if (p2p->sd_query) {
825 if (!p2p->sd_query->for_all_peers) {
826 struct p2p_sd_query *q;
827 p2p_dbg(p2p, "Remove completed SD query %p",
828 p2p->sd_query);
829 q = p2p->sd_query;
830 p2p_unlink_sd_query(p2p, p2p->sd_query);
831 p2p_free_sd_query(q);
832 }
833 p2p->sd_query = NULL;
834 }
835
836 if (p2p->cfg->sd_response)
837 p2p->cfg->sd_response(p2p->cfg->cb_ctx, sa,
838 p2p->sd_rx_update_indic,
839 wpabuf_head(p2p->sd_rx_resp),
840 wpabuf_len(p2p->sd_rx_resp));
841 wpabuf_free(p2p->sd_rx_resp);
842 p2p->sd_rx_resp = NULL;
843
844 p2p_continue_find(p2p);
845 }
846
847
p2p_sd_request(struct p2p_data * p2p,const u8 * dst,const struct wpabuf * tlvs)848 void * p2p_sd_request(struct p2p_data *p2p, const u8 *dst,
849 const struct wpabuf *tlvs)
850 {
851 struct p2p_sd_query *q;
852
853 q = os_zalloc(sizeof(*q));
854 if (q == NULL)
855 return NULL;
856
857 if (dst)
858 os_memcpy(q->peer, dst, ETH_ALEN);
859 else
860 q->for_all_peers = 1;
861
862 q->tlvs = wpabuf_dup(tlvs);
863 if (q->tlvs == NULL) {
864 p2p_free_sd_query(q);
865 return NULL;
866 }
867
868 q->next = p2p->sd_queries;
869 p2p->sd_queries = q;
870 p2p_dbg(p2p, "Added SD Query %p", q);
871
872 if (dst == NULL) {
873 struct p2p_device *dev;
874
875 p2p->num_p2p_sd_queries++;
876
877 /* Update all the devices for the newly added broadcast query */
878 dl_list_for_each(dev, &p2p->devices, struct p2p_device, list) {
879 if (dev->sd_pending_bcast_queries <= 0)
880 dev->sd_pending_bcast_queries = 1;
881 else
882 dev->sd_pending_bcast_queries++;
883 }
884 }
885
886 return q;
887 }
888
889
890 #ifdef CONFIG_WIFI_DISPLAY
p2p_sd_request_wfd(struct p2p_data * p2p,const u8 * dst,const struct wpabuf * tlvs)891 void * p2p_sd_request_wfd(struct p2p_data *p2p, const u8 *dst,
892 const struct wpabuf *tlvs)
893 {
894 struct p2p_sd_query *q;
895 q = p2p_sd_request(p2p, dst, tlvs);
896 if (q)
897 q->wsd = 1;
898 return q;
899 }
900 #endif /* CONFIG_WIFI_DISPLAY */
901
902
p2p_sd_service_update(struct p2p_data * p2p)903 void p2p_sd_service_update(struct p2p_data *p2p)
904 {
905 p2p->srv_update_indic++;
906 }
907
908
p2p_sd_cancel_request(struct p2p_data * p2p,void * req)909 int p2p_sd_cancel_request(struct p2p_data *p2p, void *req)
910 {
911 if (p2p_unlink_sd_query(p2p, req)) {
912 p2p_dbg(p2p, "Cancel pending SD query %p", req);
913 p2p_free_sd_query(req);
914 return 0;
915 }
916 return -1;
917 }
918